net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <[email protected]>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         trans->msg_type = msg_type;
 155         trans->ctx      = *ctx;
 156
 157         return trans;
 158 }
 159
 160 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 161                                          int msg_type, u32 size)
 162 {
 163         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 164 }
 165
 166 static void nft_trans_destroy(struct nft_trans *trans)
 167 {
 168         list_del(&trans->list);
 169         kfree(trans);
 170 }
 171
 172 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 173 {
 174         struct nftables_pernet *nft_net;
 175         struct net *net = ctx->net;
 176         struct nft_trans *trans;
 177
 178         if (!nft_set_is_anonymous(set))
 179                 return;
 180
 181         nft_net = nft_pernet(net);
 182         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 183                 switch (trans->msg_type) {
 184                 case NFT_MSG_NEWSET:
 185                         if (nft_trans_set(trans) == set)
 186                                 nft_trans_set_bound(trans) = true;
 187                         break;
 188                 case NFT_MSG_NEWSETELEM:
 189                         if (nft_trans_elem_set(trans) == set)
 190                                 nft_trans_elem_set_bound(trans) = true;
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 static int nft_netdev_register_hooks(struct net *net,
 197                                      struct list_head *hook_list)
 198 {
 199         struct nft_hook *hook;
 200         int err, j;
 201
 202         j = 0;
 203         list_for_each_entry(hook, hook_list, list) {
 204                 err = nf_register_net_hook(net, &hook->ops);
 205                 if (err < 0)
 206                         goto err_register;
 207
 208                 j++;
 209         }
 210         return 0;
 211
 212 err_register:
 213         list_for_each_entry(hook, hook_list, list) {
 214                 if (j-- <= 0)
 215                         break;
 216
 217                 nf_unregister_net_hook(net, &hook->ops);
 218         }
 219         return err;
 220 }
 221
 222 static void nft_netdev_unregister_hooks(struct net *net,
 223                                         struct list_head *hook_list,
 224                                         bool release_netdev)
 225 {
 226         struct nft_hook *hook, *next;
 227
 228         list_for_each_entry_safe(hook, next, hook_list, list) {
 229                 nf_unregister_net_hook(net, &hook->ops);
 230                 if (release_netdev) {
 231                         list_del(&hook->list);
 232                         kfree_rcu(hook, rcu);
 233                 }
 234         }
 235 }
 236
 237 static int nf_tables_register_hook(struct net *net,
 238                                    const struct nft_table *table,
 239                                    struct nft_chain *chain)
 240 {
 241         struct nft_base_chain *basechain;
 242         const struct nf_hook_ops *ops;
 243
 244         if (table->flags & NFT_TABLE_F_DORMANT ||
 245             !nft_is_base_chain(chain))
 246                 return 0;
 247
 248         basechain = nft_base_chain(chain);
 249         ops = &basechain->ops;
 250
 251         if (basechain->type->ops_register)
 252                 return basechain->type->ops_register(net, ops);
 253
 254         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 255                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 256
 257         return nf_register_net_hook(net, &basechain->ops);
 258 }
 259
 260 static void __nf_tables_unregister_hook(struct net *net,
 261                                         const struct nft_table *table,
 262                                         struct nft_chain *chain,
 263                                         bool release_netdev)
 264 {
 265         struct nft_base_chain *basechain;
 266         const struct nf_hook_ops *ops;
 267
 268         if (table->flags & NFT_TABLE_F_DORMANT ||
 269             !nft_is_base_chain(chain))
 270                 return;
 271         basechain = nft_base_chain(chain);
 272         ops = &basechain->ops;
 273
 274         if (basechain->type->ops_unregister)
 275                 return basechain->type->ops_unregister(net, ops);
 276
 277         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 278                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 279                                             release_netdev);
 280         else
 281                 nf_unregister_net_hook(net, &basechain->ops);
 282 }
 283
 284 static void nf_tables_unregister_hook(struct net *net,
 285                                       const struct nft_table *table,
 286                                       struct nft_chain *chain)
 287 {
 288         return __nf_tables_unregister_hook(net, table, chain, false);
 289 }
 290
 291 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 292 {
 293         struct nftables_pernet *nft_net = nft_pernet(net);
 294
 295         list_add_tail(&trans->list, &nft_net->commit_list);
 296 }
 297
 298 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 299 {
 300         struct nft_trans *trans;
 301
 302         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 303         if (trans == NULL)
 304                 return -ENOMEM;
 305
 306         if (msg_type == NFT_MSG_NEWTABLE)
 307                 nft_activate_next(ctx->net, ctx->table);
 308
 309         nft_trans_commit_list_add_tail(ctx->net, trans);
 310         return 0;
 311 }
 312
 313 static int nft_deltable(struct nft_ctx *ctx)
 314 {
 315         int err;
 316
 317         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 318         if (err < 0)
 319                 return err;
 320
 321         nft_deactivate_next(ctx->net, ctx->table);
 322         return err;
 323 }
 324
 325 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 326 {
 327         struct nft_trans *trans;
 328
 329         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 330         if (trans == NULL)
 331                 return ERR_PTR(-ENOMEM);
 332
 333         if (msg_type == NFT_MSG_NEWCHAIN) {
 334                 nft_activate_next(ctx->net, ctx->chain);
 335
 336                 if (ctx->nla[NFTA_CHAIN_ID]) {
 337                         nft_trans_chain_id(trans) =
 338                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 339                 }
 340         }
 341
 342         nft_trans_commit_list_add_tail(ctx->net, trans);
 343         return trans;
 344 }
 345
 346 static int nft_delchain(struct nft_ctx *ctx)
 347 {
 348         struct nft_trans *trans;
 349
 350         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 351         if (IS_ERR(trans))
 352                 return PTR_ERR(trans);
 353
 354         ctx->table->use--;
 355         nft_deactivate_next(ctx->net, ctx->chain);
 356
 357         return 0;
 358 }
 359
 360 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 361                                    struct nft_rule *rule)
 362 {
 363         struct nft_expr *expr;
 364
 365         expr = nft_expr_first(rule);
 366         while (nft_expr_more(rule, expr)) {
 367                 if (expr->ops->activate)
 368                         expr->ops->activate(ctx, expr);
 369
 370                 expr = nft_expr_next(expr);
 371         }
 372 }
 373
 374 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 375                                      struct nft_rule *rule,
 376                                      enum nft_trans_phase phase)
 377 {
 378         struct nft_expr *expr;
 379
 380         expr = nft_expr_first(rule);
 381         while (nft_expr_more(rule, expr)) {
 382                 if (expr->ops->deactivate)
 383                         expr->ops->deactivate(ctx, expr, phase);
 384
 385                 expr = nft_expr_next(expr);
 386         }
 387 }
 388
 389 static int
 390 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 391 {
 392         /* You cannot delete the same rule twice */
 393         if (nft_is_active_next(ctx->net, rule)) {
 394                 nft_deactivate_next(ctx->net, rule);
 395                 ctx->chain->use--;
 396                 return 0;
 397         }
 398         return -ENOENT;
 399 }
 400
 401 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 402                                             struct nft_rule *rule)
 403 {
 404         struct nft_trans *trans;
 405
 406         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 407         if (trans == NULL)
 408                 return NULL;
 409
 410         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 411                 nft_trans_rule_id(trans) =
 412                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 413         }
 414         nft_trans_rule(trans) = rule;
 415         nft_trans_commit_list_add_tail(ctx->net, trans);
 416
 417         return trans;
 418 }
 419
 420 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 421 {
 422         struct nft_flow_rule *flow;
 423         struct nft_trans *trans;
 424         int err;
 425
 426         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 427         if (trans == NULL)
 428                 return -ENOMEM;
 429
 430         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 431                 flow = nft_flow_rule_create(ctx->net, rule);
 432                 if (IS_ERR(flow)) {
 433                         nft_trans_destroy(trans);
 434                         return PTR_ERR(flow);
 435                 }
 436
 437                 nft_trans_flow_rule(trans) = flow;
 438         }
 439
 440         err = nf_tables_delrule_deactivate(ctx, rule);
 441         if (err < 0) {
 442                 nft_trans_destroy(trans);
 443                 return err;
 444         }
 445         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 446
 447         return 0;
 448 }
 449
 450 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 451 {
 452         struct nft_rule *rule;
 453         int err;
 454
 455         list_for_each_entry(rule, &ctx->chain->rules, list) {
 456                 if (!nft_is_active_next(ctx->net, rule))
 457                         continue;
 458
 459                 err = nft_delrule(ctx, rule);
 460                 if (err < 0)
 461                         return err;
 462         }
 463         return 0;
 464 }
 465
 466 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 467                                struct nft_set *set,
 468                                const struct nft_set_desc *desc)
 469 {
 470         struct nft_trans *trans;
 471
 472         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 473         if (trans == NULL)
 474                 return -ENOMEM;
 475
 476         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 477                 nft_trans_set_id(trans) =
 478                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 479                 nft_activate_next(ctx->net, set);
 480         }
 481         nft_trans_set(trans) = set;
 482         if (desc) {
 483                 nft_trans_set_update(trans) = true;
 484                 nft_trans_set_gc_int(trans) = desc->gc_int;
 485                 nft_trans_set_timeout(trans) = desc->timeout;
 486         }
 487         nft_trans_commit_list_add_tail(ctx->net, trans);
 488
 489         return 0;
 490 }
 491
 492 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 493                              struct nft_set *set)
 494 {
 495         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 496 }
 497
 498 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 499 {
 500         int err;
 501
 502         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 503         if (err < 0)
 504                 return err;
 505
 506         nft_deactivate_next(ctx->net, set);
 507         ctx->table->use--;
 508
 509         return err;
 510 }
 511
 512 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 513                              struct nft_object *obj)
 514 {
 515         struct nft_trans *trans;
 516
 517         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 518         if (trans == NULL)
 519                 return -ENOMEM;
 520
 521         if (msg_type == NFT_MSG_NEWOBJ)
 522                 nft_activate_next(ctx->net, obj);
 523
 524         nft_trans_obj(trans) = obj;
 525         nft_trans_commit_list_add_tail(ctx->net, trans);
 526
 527         return 0;
 528 }
 529
 530 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 531 {
 532         int err;
 533
 534         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 535         if (err < 0)
 536                 return err;
 537
 538         nft_deactivate_next(ctx->net, obj);
 539         ctx->table->use--;
 540
 541         return err;
 542 }
 543
 544 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 545                                    struct nft_flowtable *flowtable)
 546 {
 547         struct nft_trans *trans;
 548
 549         trans = nft_trans_alloc(ctx, msg_type,
 550                                 sizeof(struct nft_trans_flowtable));
 551         if (trans == NULL)
 552                 return -ENOMEM;
 553
 554         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 555                 nft_activate_next(ctx->net, flowtable);
 556
 557         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 558         nft_trans_flowtable(trans) = flowtable;
 559         nft_trans_commit_list_add_tail(ctx->net, trans);
 560
 561         return 0;
 562 }
 563
 564 static int nft_delflowtable(struct nft_ctx *ctx,
 565                             struct nft_flowtable *flowtable)
 566 {
 567         int err;
 568
 569         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 570         if (err < 0)
 571                 return err;
 572
 573         nft_deactivate_next(ctx->net, flowtable);
 574         ctx->table->use--;
 575
 576         return err;
 577 }
 578
 579 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 580 {
 581         int i;
 582
 583         for (i = track->regs[dreg].num_reg; i > 0; i--)
 584                 __nft_reg_track_cancel(track, dreg - i);
 585 }
 586
 587 static void __nft_reg_track_update(struct nft_regs_track *track,
 588                                    const struct nft_expr *expr,
 589                                    u8 dreg, u8 num_reg)
 590 {
 591         track->regs[dreg].selector = expr;
 592         track->regs[dreg].bitwise = NULL;
 593         track->regs[dreg].num_reg = num_reg;
 594 }
 595
 596 void nft_reg_track_update(struct nft_regs_track *track,
 597                           const struct nft_expr *expr, u8 dreg, u8 len)
 598 {
 599         unsigned int regcount;
 600         int i;
 601
 602         __nft_reg_track_clobber(track, dreg);
 603
 604         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 605         for (i = 0; i < regcount; i++, dreg++)
 606                 __nft_reg_track_update(track, expr, dreg, i);
 607 }
 608 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 609
 610 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 611 {
 612         unsigned int regcount;
 613         int i;
 614
 615         __nft_reg_track_clobber(track, dreg);
 616
 617         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 618         for (i = 0; i < regcount; i++, dreg++)
 619                 __nft_reg_track_cancel(track, dreg);
 620 }
 621 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 622
 623 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 624 {
 625         track->regs[dreg].selector = NULL;
 626         track->regs[dreg].bitwise = NULL;
 627         track->regs[dreg].num_reg = 0;
 628 }
 629 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 630
 631 /*
 632  * Tables
 633  */
 634
 635 static struct nft_table *nft_table_lookup(const struct net *net,
 636                                           const struct nlattr *nla,
 637                                           u8 family, u8 genmask, u32 nlpid)
 638 {
 639         struct nftables_pernet *nft_net;
 640         struct nft_table *table;
 641
 642         if (nla == NULL)
 643                 return ERR_PTR(-EINVAL);
 644
 645         nft_net = nft_pernet(net);
 646         list_for_each_entry_rcu(table, &nft_net->tables, list,
 647                                 lockdep_is_held(&nft_net->commit_mutex)) {
 648                 if (!nla_strcmp(nla, table->name) &&
 649                     table->family == family &&
 650                     nft_active_genmask(table, genmask)) {
 651                         if (nft_table_has_owner(table) &&
 652                             nlpid && table->nlpid != nlpid)
 653                                 return ERR_PTR(-EPERM);
 654
 655                         return table;
 656                 }
 657         }
 658
 659         return ERR_PTR(-ENOENT);
 660 }
 661
 662 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 663                                                    const struct nlattr *nla,
 664                                                    u8 genmask, u32 nlpid)
 665 {
 666         struct nftables_pernet *nft_net;
 667         struct nft_table *table;
 668
 669         nft_net = nft_pernet(net);
 670         list_for_each_entry(table, &nft_net->tables, list) {
 671                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 672                     nft_active_genmask(table, genmask)) {
 673                         if (nft_table_has_owner(table) &&
 674                             nlpid && table->nlpid != nlpid)
 675                                 return ERR_PTR(-EPERM);
 676
 677                         return table;
 678                 }
 679         }
 680
 681         return ERR_PTR(-ENOENT);
 682 }
 683
 684 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 685 {
 686         return ++table->hgenerator;
 687 }
 688
 689 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 690
 691 static const struct nft_chain_type *
 692 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 693 {
 694         if (family >= NFPROTO_NUMPROTO ||
 695             type >= NFT_CHAIN_T_MAX)
 696                 return NULL;
 697
 698         return chain_type[family][type];
 699 }
 700
 701 static const struct nft_chain_type *
 702 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 703 {
 704         const struct nft_chain_type *type;
 705         int i;
 706
 707         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 708                 type = __nft_chain_type_get(family, i);
 709                 if (!type)
 710                         continue;
 711                 if (!nla_strcmp(nla, type->name))
 712                         return type;
 713         }
 714         return NULL;
 715 }
 716
 717 struct nft_module_request {
 718         struct list_head        list;
 719         char                    module[MODULE_NAME_LEN];
 720         bool                    done;
 721 };
 722
 723 #ifdef CONFIG_MODULES
 724 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 725                                       ...)
 726 {
 727         char module_name[MODULE_NAME_LEN];
 728         struct nftables_pernet *nft_net;
 729         struct nft_module_request *req;
 730         va_list args;
 731         int ret;
 732
 733         va_start(args, fmt);
 734         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 735         va_end(args);
 736         if (ret >= MODULE_NAME_LEN)
 737                 return 0;
 738
 739         nft_net = nft_pernet(net);
 740         list_for_each_entry(req, &nft_net->module_list, list) {
 741                 if (!strcmp(req->module, module_name)) {
 742                         if (req->done)
 743                                 return 0;
 744
 745                         /* A request to load this module already exists. */
 746                         return -EAGAIN;
 747                 }
 748         }
 749
 750         req = kmalloc(sizeof(*req), GFP_KERNEL);
 751         if (!req)
 752                 return -ENOMEM;
 753
 754         req->done = false;
 755         strscpy(req->module, module_name, MODULE_NAME_LEN);
 756         list_add_tail(&req->list, &nft_net->module_list);
 757
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nft_request_module);
 761 #endif
 762
 763 static void lockdep_nfnl_nft_mutex_not_held(void)
 764 {
 765 #ifdef CONFIG_PROVE_LOCKING
 766         if (debug_locks)
 767                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 768 #endif
 769 }
 770
 771 static const struct nft_chain_type *
 772 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 773                             u8 family, bool autoload)
 774 {
 775         const struct nft_chain_type *type;
 776
 777         type = __nf_tables_chain_type_lookup(nla, family);
 778         if (type != NULL)
 779                 return type;
 780
 781         lockdep_nfnl_nft_mutex_not_held();
 782 #ifdef CONFIG_MODULES
 783         if (autoload) {
 784                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 785                                        nla_len(nla),
 786                                        (const char *)nla_data(nla)) == -EAGAIN)
 787                         return ERR_PTR(-EAGAIN);
 788         }
 789 #endif
 790         return ERR_PTR(-ENOENT);
 791 }
 792
 793 static __be16 nft_base_seq(const struct net *net)
 794 {
 795         struct nftables_pernet *nft_net = nft_pernet(net);
 796
 797         return htons(nft_net->base_seq & 0xffff);
 798 }
 799
 800 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 801         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 802                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 803         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 804         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 805         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 806                                     .len = NFT_USERDATA_MAXLEN }
 807 };
 808
 809 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 810                                      u32 portid, u32 seq, int event, u32 flags,
 811                                      int family, const struct nft_table *table)
 812 {
 813         struct nlmsghdr *nlh;
 814
 815         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 816         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 817                            NFNETLINK_V0, nft_base_seq(net));
 818         if (!nlh)
 819                 goto nla_put_failure;
 820
 821         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 822             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 823             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 824                          NFTA_TABLE_PAD))
 825                 goto nla_put_failure;
 826
 827         if (event == NFT_MSG_DELTABLE) {
 828                 nlmsg_end(skb, nlh);
 829                 return 0;
 830         }
 831
 832         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 833                          htonl(table->flags & NFT_TABLE_F_MASK)))
 834                 goto nla_put_failure;
 835
 836         if (nft_table_has_owner(table) &&
 837             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 838                 goto nla_put_failure;
 839
 840         if (table->udata) {
 841                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 842                         goto nla_put_failure;
 843         }
 844
 845         nlmsg_end(skb, nlh);
 846         return 0;
 847
 848 nla_put_failure:
 849         nlmsg_trim(skb, nlh);
 850         return -1;
 851 }
 852
 853 struct nftnl_skb_parms {
 854         bool report;
 855 };
 856 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 857
 858 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 859                                struct list_head *notify_list)
 860 {
 861         NFT_CB(skb).report = report;
 862         list_add_tail(&skb->list, notify_list);
 863 }
 864
 865 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 866 {
 867         struct nftables_pernet *nft_net;
 868         struct sk_buff *skb;
 869         u16 flags = 0;
 870         int err;
 871
 872         if (!ctx->report &&
 873             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 874                 return;
 875
 876         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 877         if (skb == NULL)
 878                 goto err;
 879
 880         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 881                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 882
 883         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 884                                         event, flags, ctx->family, ctx->table);
 885         if (err < 0) {
 886                 kfree_skb(skb);
 887                 goto err;
 888         }
 889
 890         nft_net = nft_pernet(ctx->net);
 891         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 892         return;
 893 err:
 894         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 895 }
 896
 897 static int nf_tables_dump_tables(struct sk_buff *skb,
 898                                  struct netlink_callback *cb)
 899 {
 900         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 901         struct nftables_pernet *nft_net;
 902         const struct nft_table *table;
 903         unsigned int idx = 0, s_idx = cb->args[0];
 904         struct net *net = sock_net(skb->sk);
 905         int family = nfmsg->nfgen_family;
 906
 907         rcu_read_lock();
 908         nft_net = nft_pernet(net);
 909         cb->seq = READ_ONCE(nft_net->base_seq);
 910
 911         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 912                 if (family != NFPROTO_UNSPEC && family != table->family)
 913                         continue;
 914
 915                 if (idx < s_idx)
 916                         goto cont;
 917                 if (idx > s_idx)
 918                         memset(&cb->args[1], 0,
 919                                sizeof(cb->args) - sizeof(cb->args[0]));
 920                 if (!nft_is_active(net, table))
 921                         continue;
 922                 if (nf_tables_fill_table_info(skb, net,
 923                                               NETLINK_CB(cb->skb).portid,
 924                                               cb->nlh->nlmsg_seq,
 925                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 926                                               table->family, table) < 0)
 927                         goto done;
 928
 929                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 930 cont:
 931                 idx++;
 932         }
 933 done:
 934         rcu_read_unlock();
 935         cb->args[0] = idx;
 936         return skb->len;
 937 }
 938
 939 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 940                                       const struct nlmsghdr *nlh,
 941                                       struct netlink_dump_control *c)
 942 {
 943         int err;
 944
 945         if (!try_module_get(THIS_MODULE))
 946                 return -EINVAL;
 947
 948         rcu_read_unlock();
 949         err = netlink_dump_start(nlsk, skb, nlh, c);
 950         rcu_read_lock();
 951         module_put(THIS_MODULE);
 952
 953         return err;
 954 }
 955
 956 /* called with rcu_read_lock held */
 957 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 958                               const struct nlattr * const nla[])
 959 {
 960         struct netlink_ext_ack *extack = info->extack;
 961         u8 genmask = nft_genmask_cur(info->net);
 962         u8 family = info->nfmsg->nfgen_family;
 963         const struct nft_table *table;
 964         struct net *net = info->net;
 965         struct sk_buff *skb2;
 966         int err;
 967
 968         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 969                 struct netlink_dump_control c = {
 970                         .dump = nf_tables_dump_tables,
 971                         .module = THIS_MODULE,
 972                 };
 973
 974                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 975         }
 976
 977         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 978         if (IS_ERR(table)) {
 979                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 980                 return PTR_ERR(table);
 981         }
 982
 983         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 984         if (!skb2)
 985                 return -ENOMEM;
 986
 987         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 988                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 989                                         0, family, table);
 990         if (err < 0)
 991                 goto err_fill_table_info;
 992
 993         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 994
 995 err_fill_table_info:
 996         kfree_skb(skb2);
 997         return err;
 998 }
 999
1000 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1001 {
1002         struct nft_chain *chain;
1003         u32 i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 if (cnt && i++ == cnt)
1012                         break;
1013
1014                 nf_tables_unregister_hook(net, table, chain);
1015         }
1016 }
1017
1018 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1019 {
1020         struct nft_chain *chain;
1021         int err, i = 0;
1022
1023         list_for_each_entry(chain, &table->chains, list) {
1024                 if (!nft_is_active_next(net, chain))
1025                         continue;
1026                 if (!nft_is_base_chain(chain))
1027                         continue;
1028
1029                 err = nf_tables_register_hook(net, table, chain);
1030                 if (err < 0)
1031                         goto err_register_hooks;
1032
1033                 i++;
1034         }
1035         return 0;
1036
1037 err_register_hooks:
1038         if (i)
1039                 nft_table_disable(net, table, i);
1040         return err;
1041 }
1042
1043 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1044 {
1045         table->flags &= ~NFT_TABLE_F_DORMANT;
1046         nft_table_disable(net, table, 0);
1047         table->flags |= NFT_TABLE_F_DORMANT;
1048 }
1049
1050 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1051 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1052 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1053 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1054                                          __NFT_TABLE_F_WAS_AWAKEN)
1055
1056 static int nf_tables_updtable(struct nft_ctx *ctx)
1057 {
1058         struct nft_trans *trans;
1059         u32 flags;
1060         int ret;
1061
1062         if (!ctx->nla[NFTA_TABLE_FLAGS])
1063                 return 0;
1064
1065         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1066         if (flags & ~NFT_TABLE_F_MASK)
1067                 return -EOPNOTSUPP;
1068
1069         if (flags == ctx->table->flags)
1070                 return 0;
1071
1072         if ((nft_table_has_owner(ctx->table) &&
1073              !(flags & NFT_TABLE_F_OWNER)) ||
1074             (!nft_table_has_owner(ctx->table) &&
1075              flags & NFT_TABLE_F_OWNER))
1076                 return -EOPNOTSUPP;
1077
1078         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1079                                 sizeof(struct nft_trans_table));
1080         if (trans == NULL)
1081                 return -ENOMEM;
1082
1083         if ((flags & NFT_TABLE_F_DORMANT) &&
1084             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1085                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1086                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1087                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1088         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1089                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1090                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1091                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1092                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1093                         if (ret < 0)
1094                                 goto err_register_hooks;
1095
1096                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1097                 }
1098         }
1099
1100         nft_trans_table_update(trans) = true;
1101         nft_trans_commit_list_add_tail(ctx->net, trans);
1102
1103         return 0;
1104
1105 err_register_hooks:
1106         nft_trans_destroy(trans);
1107         return ret;
1108 }
1109
1110 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1111 {
1112         const char *name = data;
1113
1114         return jhash(name, strlen(name), seed);
1115 }
1116
1117 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1118 {
1119         const struct nft_chain *chain = data;
1120
1121         return nft_chain_hash(chain->name, 0, seed);
1122 }
1123
1124 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1125                               const void *ptr)
1126 {
1127         const struct nft_chain *chain = ptr;
1128         const char *name = arg->key;
1129
1130         return strcmp(chain->name, name);
1131 }
1132
1133 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1134 {
1135         const struct nft_object_hash_key *k = data;
1136
1137         seed ^= hash_ptr(k->table, 32);
1138
1139         return jhash(k->name, strlen(k->name), seed);
1140 }
1141
1142 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1143 {
1144         const struct nft_object *obj = data;
1145
1146         return nft_objname_hash(&obj->key, 0, seed);
1147 }
1148
1149 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1150                                 const void *ptr)
1151 {
1152         const struct nft_object_hash_key *k = arg->key;
1153         const struct nft_object *obj = ptr;
1154
1155         if (obj->key.table != k->table)
1156                 return -1;
1157
1158         return strcmp(obj->key.name, k->name);
1159 }
1160
1161 static bool nft_supported_family(u8 family)
1162 {
1163         return false
1164 #ifdef CONFIG_NF_TABLES_INET
1165                 || family == NFPROTO_INET
1166 #endif
1167 #ifdef CONFIG_NF_TABLES_IPV4
1168                 || family == NFPROTO_IPV4
1169 #endif
1170 #ifdef CONFIG_NF_TABLES_ARP
1171                 || family == NFPROTO_ARP
1172 #endif
1173 #ifdef CONFIG_NF_TABLES_NETDEV
1174                 || family == NFPROTO_NETDEV
1175 #endif
1176 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1177                 || family == NFPROTO_BRIDGE
1178 #endif
1179 #ifdef CONFIG_NF_TABLES_IPV6
1180                 || family == NFPROTO_IPV6
1181 #endif
1182                 ;
1183 }
1184
1185 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1186                               const struct nlattr * const nla[])
1187 {
1188         struct nftables_pernet *nft_net = nft_pernet(info->net);
1189         struct netlink_ext_ack *extack = info->extack;
1190         u8 genmask = nft_genmask_next(info->net);
1191         u8 family = info->nfmsg->nfgen_family;
1192         struct net *net = info->net;
1193         const struct nlattr *attr;
1194         struct nft_table *table;
1195         struct nft_ctx ctx;
1196         u32 flags = 0;
1197         int err;
1198
1199         if (!nft_supported_family(family))
1200                 return -EOPNOTSUPP;
1201
1202         lockdep_assert_held(&nft_net->commit_mutex);
1203         attr = nla[NFTA_TABLE_NAME];
1204         table = nft_table_lookup(net, attr, family, genmask,
1205                                  NETLINK_CB(skb).portid);
1206         if (IS_ERR(table)) {
1207                 if (PTR_ERR(table) != -ENOENT)
1208                         return PTR_ERR(table);
1209         } else {
1210                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1211                         NL_SET_BAD_ATTR(extack, attr);
1212                         return -EEXIST;
1213                 }
1214                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1215                         return -EOPNOTSUPP;
1216
1217                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1218
1219                 return nf_tables_updtable(&ctx);
1220         }
1221
1222         if (nla[NFTA_TABLE_FLAGS]) {
1223                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1224                 if (flags & ~NFT_TABLE_F_MASK)
1225                         return -EOPNOTSUPP;
1226         }
1227
1228         err = -ENOMEM;
1229         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1230         if (table == NULL)
1231                 goto err_kzalloc;
1232
1233         table->validate_state = NFT_VALIDATE_SKIP;
1234         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1235         if (table->name == NULL)
1236                 goto err_strdup;
1237
1238         if (nla[NFTA_TABLE_USERDATA]) {
1239                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1240                 if (table->udata == NULL)
1241                         goto err_table_udata;
1242
1243                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1244         }
1245
1246         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1247         if (err)
1248                 goto err_chain_ht;
1249
1250         INIT_LIST_HEAD(&table->chains);
1251         INIT_LIST_HEAD(&table->sets);
1252         INIT_LIST_HEAD(&table->objects);
1253         INIT_LIST_HEAD(&table->flowtables);
1254         table->family = family;
1255         table->flags = flags;
1256         table->handle = ++nft_net->table_handle;
1257         if (table->flags & NFT_TABLE_F_OWNER)
1258                 table->nlpid = NETLINK_CB(skb).portid;
1259
1260         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1261         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1262         if (err < 0)
1263                 goto err_trans;
1264
1265         list_add_tail_rcu(&table->list, &nft_net->tables);
1266         return 0;
1267 err_trans:
1268         rhltable_destroy(&table->chains_ht);
1269 err_chain_ht:
1270         kfree(table->udata);
1271 err_table_udata:
1272         kfree(table->name);
1273 err_strdup:
1274         kfree(table);
1275 err_kzalloc:
1276         return err;
1277 }
1278
1279 static int nft_flush_table(struct nft_ctx *ctx)
1280 {
1281         struct nft_flowtable *flowtable, *nft;
1282         struct nft_chain *chain, *nc;
1283         struct nft_object *obj, *ne;
1284         struct nft_set *set, *ns;
1285         int err;
1286
1287         list_for_each_entry(chain, &ctx->table->chains, list) {
1288                 if (!nft_is_active_next(ctx->net, chain))
1289                         continue;
1290
1291                 if (nft_chain_is_bound(chain))
1292                         continue;
1293
1294                 ctx->chain = chain;
1295
1296                 err = nft_delrule_by_chain(ctx);
1297                 if (err < 0)
1298                         goto out;
1299         }
1300
1301         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1302                 if (!nft_is_active_next(ctx->net, set))
1303                         continue;
1304
1305                 if (nft_set_is_anonymous(set) &&
1306                     !list_empty(&set->bindings))
1307                         continue;
1308
1309                 err = nft_delset(ctx, set);
1310                 if (err < 0)
1311                         goto out;
1312         }
1313
1314         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1315                 if (!nft_is_active_next(ctx->net, flowtable))
1316                         continue;
1317
1318                 err = nft_delflowtable(ctx, flowtable);
1319                 if (err < 0)
1320                         goto out;
1321         }
1322
1323         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1324                 if (!nft_is_active_next(ctx->net, obj))
1325                         continue;
1326
1327                 err = nft_delobj(ctx, obj);
1328                 if (err < 0)
1329                         goto out;
1330         }
1331
1332         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1333                 if (!nft_is_active_next(ctx->net, chain))
1334                         continue;
1335
1336                 if (nft_chain_is_bound(chain))
1337                         continue;
1338
1339                 ctx->chain = chain;
1340
1341                 err = nft_delchain(ctx);
1342                 if (err < 0)
1343                         goto out;
1344         }
1345
1346         err = nft_deltable(ctx);
1347 out:
1348         return err;
1349 }
1350
1351 static int nft_flush(struct nft_ctx *ctx, int family)
1352 {
1353         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1354         const struct nlattr * const *nla = ctx->nla;
1355         struct nft_table *table, *nt;
1356         int err = 0;
1357
1358         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1359                 if (family != AF_UNSPEC && table->family != family)
1360                         continue;
1361
1362                 ctx->family = table->family;
1363
1364                 if (!nft_is_active_next(ctx->net, table))
1365                         continue;
1366
1367                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1368                         continue;
1369
1370                 if (nla[NFTA_TABLE_NAME] &&
1371                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1372                         continue;
1373
1374                 ctx->table = table;
1375
1376                 err = nft_flush_table(ctx);
1377                 if (err < 0)
1378                         goto out;
1379         }
1380 out:
1381         return err;
1382 }
1383
1384 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1385                               const struct nlattr * const nla[])
1386 {
1387         struct netlink_ext_ack *extack = info->extack;
1388         u8 genmask = nft_genmask_next(info->net);
1389         u8 family = info->nfmsg->nfgen_family;
1390         struct net *net = info->net;
1391         const struct nlattr *attr;
1392         struct nft_table *table;
1393         struct nft_ctx ctx;
1394
1395         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1396         if (family == AF_UNSPEC ||
1397             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1398                 return nft_flush(&ctx, family);
1399
1400         if (nla[NFTA_TABLE_HANDLE]) {
1401                 attr = nla[NFTA_TABLE_HANDLE];
1402                 table = nft_table_lookup_byhandle(net, attr, genmask,
1403                                                   NETLINK_CB(skb).portid);
1404         } else {
1405                 attr = nla[NFTA_TABLE_NAME];
1406                 table = nft_table_lookup(net, attr, family, genmask,
1407                                          NETLINK_CB(skb).portid);
1408         }
1409
1410         if (IS_ERR(table)) {
1411                 if (PTR_ERR(table) == -ENOENT &&
1412                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1413                         return 0;
1414
1415                 NL_SET_BAD_ATTR(extack, attr);
1416                 return PTR_ERR(table);
1417         }
1418
1419         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1420             table->use > 0)
1421                 return -EBUSY;
1422
1423         ctx.family = family;
1424         ctx.table = table;
1425
1426         return nft_flush_table(&ctx);
1427 }
1428
1429 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1430 {
1431         if (WARN_ON(ctx->table->use > 0))
1432                 return;
1433
1434         rhltable_destroy(&ctx->table->chains_ht);
1435         kfree(ctx->table->name);
1436         kfree(ctx->table->udata);
1437         kfree(ctx->table);
1438 }
1439
1440 void nft_register_chain_type(const struct nft_chain_type *ctype)
1441 {
1442         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1443         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1444                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1445                 return;
1446         }
1447         chain_type[ctype->family][ctype->type] = ctype;
1448         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1449 }
1450 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1451
1452 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1453 {
1454         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1455         chain_type[ctype->family][ctype->type] = NULL;
1456         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1457 }
1458 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1459
1460 /*
1461  * Chains
1462  */
1463
1464 static struct nft_chain *
1465 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1466 {
1467         struct nft_chain *chain;
1468
1469         list_for_each_entry(chain, &table->chains, list) {
1470                 if (chain->handle == handle &&
1471                     nft_active_genmask(chain, genmask))
1472                         return chain;
1473         }
1474
1475         return ERR_PTR(-ENOENT);
1476 }
1477
1478 static bool lockdep_commit_lock_is_held(const struct net *net)
1479 {
1480 #ifdef CONFIG_PROVE_LOCKING
1481         struct nftables_pernet *nft_net = nft_pernet(net);
1482
1483         return lockdep_is_held(&nft_net->commit_mutex);
1484 #else
1485         return true;
1486 #endif
1487 }
1488
1489 static struct nft_chain *nft_chain_lookup(struct net *net,
1490                                           struct nft_table *table,
1491                                           const struct nlattr *nla, u8 genmask)
1492 {
1493         char search[NFT_CHAIN_MAXNAMELEN + 1];
1494         struct rhlist_head *tmp, *list;
1495         struct nft_chain *chain;
1496
1497         if (nla == NULL)
1498                 return ERR_PTR(-EINVAL);
1499
1500         nla_strscpy(search, nla, sizeof(search));
1501
1502         WARN_ON(!rcu_read_lock_held() &&
1503                 !lockdep_commit_lock_is_held(net));
1504
1505         chain = ERR_PTR(-ENOENT);
1506         rcu_read_lock();
1507         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1508         if (!list)
1509                 goto out_unlock;
1510
1511         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1512                 if (nft_active_genmask(chain, genmask))
1513                         goto out_unlock;
1514         }
1515         chain = ERR_PTR(-ENOENT);
1516 out_unlock:
1517         rcu_read_unlock();
1518         return chain;
1519 }
1520
1521 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1522         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1523                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1524         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1525         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1526                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1527         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1528         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1529         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1530                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1531         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1532         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1533         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1534         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1535                                     .len = NFT_USERDATA_MAXLEN },
1536 };
1537
1538 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1539         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1540         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1541         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1542                                     .len = IFNAMSIZ - 1 },
1543 };
1544
1545 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1546 {
1547         struct nft_stats *cpu_stats, total;
1548         struct nlattr *nest;
1549         unsigned int seq;
1550         u64 pkts, bytes;
1551         int cpu;
1552
1553         if (!stats)
1554                 return 0;
1555
1556         memset(&total, 0, sizeof(total));
1557         for_each_possible_cpu(cpu) {
1558                 cpu_stats = per_cpu_ptr(stats, cpu);
1559                 do {
1560                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1561                         pkts = cpu_stats->pkts;
1562                         bytes = cpu_stats->bytes;
1563                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1564                 total.pkts += pkts;
1565                 total.bytes += bytes;
1566         }
1567         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1568         if (nest == NULL)
1569                 goto nla_put_failure;
1570
1571         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1572                          NFTA_COUNTER_PAD) ||
1573             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1574                          NFTA_COUNTER_PAD))
1575                 goto nla_put_failure;
1576
1577         nla_nest_end(skb, nest);
1578         return 0;
1579
1580 nla_put_failure:
1581         return -ENOSPC;
1582 }
1583
1584 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1585                                    const struct nft_base_chain *basechain,
1586                                    const struct list_head *hook_list)
1587 {
1588         const struct nf_hook_ops *ops = &basechain->ops;
1589         struct nft_hook *hook, *first = NULL;
1590         struct nlattr *nest, *nest_devs;
1591         int n = 0;
1592
1593         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1594         if (nest == NULL)
1595                 goto nla_put_failure;
1596         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1597                 goto nla_put_failure;
1598         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1599                 goto nla_put_failure;
1600
1601         if (nft_base_chain_netdev(family, ops->hooknum)) {
1602                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1603
1604                 if (!hook_list)
1605                         hook_list = &basechain->hook_list;
1606
1607                 list_for_each_entry(hook, hook_list, list) {
1608                         if (!first)
1609                                 first = hook;
1610
1611                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1612                                            hook->ops.dev->name))
1613                                 goto nla_put_failure;
1614                         n++;
1615                 }
1616                 nla_nest_end(skb, nest_devs);
1617
1618                 if (n == 1 &&
1619                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1620                         goto nla_put_failure;
1621         }
1622         nla_nest_end(skb, nest);
1623
1624         return 0;
1625 nla_put_failure:
1626         return -1;
1627 }
1628
1629 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1630                                      u32 portid, u32 seq, int event, u32 flags,
1631                                      int family, const struct nft_table *table,
1632                                      const struct nft_chain *chain,
1633                                      const struct list_head *hook_list)
1634 {
1635         struct nlmsghdr *nlh;
1636
1637         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1638         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1639                            NFNETLINK_V0, nft_base_seq(net));
1640         if (!nlh)
1641                 goto nla_put_failure;
1642
1643         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1644             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1645             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1646                          NFTA_CHAIN_PAD))
1647                 goto nla_put_failure;
1648
1649         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1650                 nlmsg_end(skb, nlh);
1651                 return 0;
1652         }
1653
1654         if (nft_is_base_chain(chain)) {
1655                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1656                 struct nft_stats __percpu *stats;
1657
1658                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1659                         goto nla_put_failure;
1660
1661                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1662                                  htonl(basechain->policy)))
1663                         goto nla_put_failure;
1664
1665                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1666                         goto nla_put_failure;
1667
1668                 stats = rcu_dereference_check(basechain->stats,
1669                                               lockdep_commit_lock_is_held(net));
1670                 if (nft_dump_stats(skb, stats))
1671                         goto nla_put_failure;
1672         }
1673
1674         if (chain->flags &&
1675             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1676                 goto nla_put_failure;
1677
1678         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1679                 goto nla_put_failure;
1680
1681         if (chain->udata &&
1682             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1683                 goto nla_put_failure;
1684
1685         nlmsg_end(skb, nlh);
1686         return 0;
1687
1688 nla_put_failure:
1689         nlmsg_trim(skb, nlh);
1690         return -1;
1691 }
1692
1693 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1694                                    const struct list_head *hook_list)
1695 {
1696         struct nftables_pernet *nft_net;
1697         struct sk_buff *skb;
1698         u16 flags = 0;
1699         int err;
1700
1701         if (!ctx->report &&
1702             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1703                 return;
1704
1705         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1706         if (skb == NULL)
1707                 goto err;
1708
1709         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1710                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1711
1712         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1713                                         event, flags, ctx->family, ctx->table,
1714                                         ctx->chain, hook_list);
1715         if (err < 0) {
1716                 kfree_skb(skb);
1717                 goto err;
1718         }
1719
1720         nft_net = nft_pernet(ctx->net);
1721         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1722         return;
1723 err:
1724         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1725 }
1726
1727 static int nf_tables_dump_chains(struct sk_buff *skb,
1728                                  struct netlink_callback *cb)
1729 {
1730         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1731         unsigned int idx = 0, s_idx = cb->args[0];
1732         struct net *net = sock_net(skb->sk);
1733         int family = nfmsg->nfgen_family;
1734         struct nftables_pernet *nft_net;
1735         const struct nft_table *table;
1736         const struct nft_chain *chain;
1737
1738         rcu_read_lock();
1739         nft_net = nft_pernet(net);
1740         cb->seq = READ_ONCE(nft_net->base_seq);
1741
1742         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1743                 if (family != NFPROTO_UNSPEC && family != table->family)
1744                         continue;
1745
1746                 list_for_each_entry_rcu(chain, &table->chains, list) {
1747                         if (idx < s_idx)
1748                                 goto cont;
1749                         if (idx > s_idx)
1750                                 memset(&cb->args[1], 0,
1751                                        sizeof(cb->args) - sizeof(cb->args[0]));
1752                         if (!nft_is_active(net, chain))
1753                                 continue;
1754                         if (nf_tables_fill_chain_info(skb, net,
1755                                                       NETLINK_CB(cb->skb).portid,
1756                                                       cb->nlh->nlmsg_seq,
1757                                                       NFT_MSG_NEWCHAIN,
1758                                                       NLM_F_MULTI,
1759                                                       table->family, table,
1760                                                       chain, NULL) < 0)
1761                                 goto done;
1762
1763                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1764 cont:
1765                         idx++;
1766                 }
1767         }
1768 done:
1769         rcu_read_unlock();
1770         cb->args[0] = idx;
1771         return skb->len;
1772 }
1773
1774 /* called with rcu_read_lock held */
1775 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1776                               const struct nlattr * const nla[])
1777 {
1778         struct netlink_ext_ack *extack = info->extack;
1779         u8 genmask = nft_genmask_cur(info->net);
1780         u8 family = info->nfmsg->nfgen_family;
1781         const struct nft_chain *chain;
1782         struct net *net = info->net;
1783         struct nft_table *table;
1784         struct sk_buff *skb2;
1785         int err;
1786
1787         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1788                 struct netlink_dump_control c = {
1789                         .dump = nf_tables_dump_chains,
1790                         .module = THIS_MODULE,
1791                 };
1792
1793                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1794         }
1795
1796         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1797         if (IS_ERR(table)) {
1798                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1799                 return PTR_ERR(table);
1800         }
1801
1802         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1803         if (IS_ERR(chain)) {
1804                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1805                 return PTR_ERR(chain);
1806         }
1807
1808         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1809         if (!skb2)
1810                 return -ENOMEM;
1811
1812         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1813                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1814                                         0, family, table, chain, NULL);
1815         if (err < 0)
1816                 goto err_fill_chain_info;
1817
1818         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1819
1820 err_fill_chain_info:
1821         kfree_skb(skb2);
1822         return err;
1823 }
1824
1825 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1826         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1827         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1828 };
1829
1830 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1831 {
1832         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1833         struct nft_stats __percpu *newstats;
1834         struct nft_stats *stats;
1835         int err;
1836
1837         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1838                                           nft_counter_policy, NULL);
1839         if (err < 0)
1840                 return ERR_PTR(err);
1841
1842         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1843                 return ERR_PTR(-EINVAL);
1844
1845         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1846         if (newstats == NULL)
1847                 return ERR_PTR(-ENOMEM);
1848
1849         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1850          * are not exposed to userspace.
1851          */
1852         preempt_disable();
1853         stats = this_cpu_ptr(newstats);
1854         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1855         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1856         preempt_enable();
1857
1858         return newstats;
1859 }
1860
1861 static void nft_chain_stats_replace(struct nft_trans *trans)
1862 {
1863         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1864
1865         if (!nft_trans_chain_stats(trans))
1866                 return;
1867
1868         nft_trans_chain_stats(trans) =
1869                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1870                                     lockdep_commit_lock_is_held(trans->ctx.net));
1871
1872         if (!nft_trans_chain_stats(trans))
1873                 static_branch_inc(&nft_counters_enabled);
1874 }
1875
1876 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1877 {
1878         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1879         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1880
1881         if (g0 != g1)
1882                 kvfree(g1);
1883         kvfree(g0);
1884
1885         /* should be NULL either via abort or via successful commit */
1886         WARN_ON_ONCE(chain->blob_next);
1887         kvfree(chain->blob_next);
1888 }
1889
1890 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1891 {
1892         struct nft_chain *chain = ctx->chain;
1893         struct nft_hook *hook, *next;
1894
1895         if (WARN_ON(chain->use > 0))
1896                 return;
1897
1898         /* no concurrent access possible anymore */
1899         nf_tables_chain_free_chain_rules(chain);
1900
1901         if (nft_is_base_chain(chain)) {
1902                 struct nft_base_chain *basechain = nft_base_chain(chain);
1903
1904                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1905                         list_for_each_entry_safe(hook, next,
1906                                                  &basechain->hook_list, list) {
1907                                 list_del_rcu(&hook->list);
1908                                 kfree_rcu(hook, rcu);
1909                         }
1910                 }
1911                 module_put(basechain->type->owner);
1912                 if (rcu_access_pointer(basechain->stats)) {
1913                         static_branch_dec(&nft_counters_enabled);
1914                         free_percpu(rcu_dereference_raw(basechain->stats));
1915                 }
1916                 kfree(chain->name);
1917                 kfree(chain->udata);
1918                 kfree(basechain);
1919         } else {
1920                 kfree(chain->name);
1921                 kfree(chain->udata);
1922                 kfree(chain);
1923         }
1924 }
1925
1926 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1927                                               const struct nlattr *attr)
1928 {
1929         struct net_device *dev;
1930         char ifname[IFNAMSIZ];
1931         struct nft_hook *hook;
1932         int err;
1933
1934         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1935         if (!hook) {
1936                 err = -ENOMEM;
1937                 goto err_hook_alloc;
1938         }
1939
1940         nla_strscpy(ifname, attr, IFNAMSIZ);
1941         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1942          * indirectly serializing all the other holders of the commit_mutex with
1943          * the rtnl_mutex.
1944          */
1945         dev = __dev_get_by_name(net, ifname);
1946         if (!dev) {
1947                 err = -ENOENT;
1948                 goto err_hook_dev;
1949         }
1950         hook->ops.dev = dev;
1951
1952         return hook;
1953
1954 err_hook_dev:
1955         kfree(hook);
1956 err_hook_alloc:
1957         return ERR_PTR(err);
1958 }
1959
1960 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1961                                            const struct nft_hook *this)
1962 {
1963         struct nft_hook *hook;
1964
1965         list_for_each_entry(hook, hook_list, list) {
1966                 if (this->ops.dev == hook->ops.dev)
1967                         return hook;
1968         }
1969
1970         return NULL;
1971 }
1972
1973 static int nf_tables_parse_netdev_hooks(struct net *net,
1974                                         const struct nlattr *attr,
1975                                         struct list_head *hook_list,
1976                                         struct netlink_ext_ack *extack)
1977 {
1978         struct nft_hook *hook, *next;
1979         const struct nlattr *tmp;
1980         int rem, n = 0, err;
1981
1982         nla_for_each_nested(tmp, attr, rem) {
1983                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1984                         err = -EINVAL;
1985                         goto err_hook;
1986                 }
1987
1988                 hook = nft_netdev_hook_alloc(net, tmp);
1989                 if (IS_ERR(hook)) {
1990                         NL_SET_BAD_ATTR(extack, tmp);
1991                         err = PTR_ERR(hook);
1992                         goto err_hook;
1993                 }
1994                 if (nft_hook_list_find(hook_list, hook)) {
1995                         NL_SET_BAD_ATTR(extack, tmp);
1996                         kfree(hook);
1997                         err = -EEXIST;
1998                         goto err_hook;
1999                 }
2000                 list_add_tail(&hook->list, hook_list);
2001                 n++;
2002
2003                 if (n == NFT_NETDEVICE_MAX) {
2004                         err = -EFBIG;
2005                         goto err_hook;
2006                 }
2007         }
2008
2009         return 0;
2010
2011 err_hook:
2012         list_for_each_entry_safe(hook, next, hook_list, list) {
2013                 list_del(&hook->list);
2014                 kfree(hook);
2015         }
2016         return err;
2017 }
2018
2019 struct nft_chain_hook {
2020         u32                             num;
2021         s32                             priority;
2022         const struct nft_chain_type     *type;
2023         struct list_head                list;
2024 };
2025
2026 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2027                                   struct list_head *hook_list,
2028                                   struct netlink_ext_ack *extack, u32 flags)
2029 {
2030         struct nft_hook *hook;
2031         int err;
2032
2033         if (tb[NFTA_HOOK_DEV]) {
2034                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2035                 if (IS_ERR(hook)) {
2036                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2037                         return PTR_ERR(hook);
2038                 }
2039
2040                 list_add_tail(&hook->list, hook_list);
2041         } else if (tb[NFTA_HOOK_DEVS]) {
2042                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2043                                                    hook_list, extack);
2044                 if (err < 0)
2045                         return err;
2046
2047         }
2048
2049         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2050             list_empty(hook_list))
2051                 return -EINVAL;
2052
2053         return 0;
2054 }
2055
2056 static int nft_chain_parse_hook(struct net *net,
2057                                 struct nft_base_chain *basechain,
2058                                 const struct nlattr * const nla[],
2059                                 struct nft_chain_hook *hook, u8 family,
2060                                 u32 flags, struct netlink_ext_ack *extack)
2061 {
2062         struct nftables_pernet *nft_net = nft_pernet(net);
2063         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2064         const struct nft_chain_type *type;
2065         int err;
2066
2067         lockdep_assert_held(&nft_net->commit_mutex);
2068         lockdep_nfnl_nft_mutex_not_held();
2069
2070         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2071                                           nla[NFTA_CHAIN_HOOK],
2072                                           nft_hook_policy, NULL);
2073         if (err < 0)
2074                 return err;
2075
2076         if (!basechain) {
2077                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2078                     !ha[NFTA_HOOK_PRIORITY]) {
2079                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2080                         return -ENOENT;
2081                 }
2082
2083                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2084                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2085
2086                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2087                 if (!type)
2088                         return -EOPNOTSUPP;
2089
2090                 if (nla[NFTA_CHAIN_TYPE]) {
2091                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2092                                                            family, true);
2093                         if (IS_ERR(type)) {
2094                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2095                                 return PTR_ERR(type);
2096                         }
2097                 }
2098                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2099                         return -EOPNOTSUPP;
2100
2101                 if (type->type == NFT_CHAIN_T_NAT &&
2102                     hook->priority <= NF_IP_PRI_CONNTRACK)
2103                         return -EOPNOTSUPP;
2104         } else {
2105                 if (ha[NFTA_HOOK_HOOKNUM]) {
2106                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2107                         if (hook->num != basechain->ops.hooknum)
2108                                 return -EOPNOTSUPP;
2109                 }
2110                 if (ha[NFTA_HOOK_PRIORITY]) {
2111                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2112                         if (hook->priority != basechain->ops.priority)
2113                                 return -EOPNOTSUPP;
2114                 }
2115
2116                 type = basechain->type;
2117         }
2118
2119         if (!try_module_get(type->owner)) {
2120                 if (nla[NFTA_CHAIN_TYPE])
2121                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2122                 return -ENOENT;
2123         }
2124
2125         hook->type = type;
2126
2127         INIT_LIST_HEAD(&hook->list);
2128         if (nft_base_chain_netdev(family, hook->num)) {
2129                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2130                 if (err < 0) {
2131                         module_put(type->owner);
2132                         return err;
2133                 }
2134         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2135                 module_put(type->owner);
2136                 return -EOPNOTSUPP;
2137         }
2138
2139         return 0;
2140 }
2141
2142 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2143 {
2144         struct nft_hook *h, *next;
2145
2146         list_for_each_entry_safe(h, next, &hook->list, list) {
2147                 list_del(&h->list);
2148                 kfree(h);
2149         }
2150         module_put(hook->type->owner);
2151 }
2152
2153 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2154 {
2155         struct nft_rule_dp_last *lrule;
2156
2157         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2158
2159         lrule = (struct nft_rule_dp_last *)ptr;
2160         lrule->end.is_last = 1;
2161         lrule->chain = chain;
2162         /* blob size does not include the trailer rule */
2163 }
2164
2165 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2166                                                          unsigned int size)
2167 {
2168         struct nft_rule_blob *blob;
2169
2170         if (size > INT_MAX)
2171                 return NULL;
2172
2173         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2174
2175         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2176         if (!blob)
2177                 return NULL;
2178
2179         blob->size = 0;
2180         nft_last_rule(chain, blob->data);
2181
2182         return blob;
2183 }
2184
2185 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2186                                     const struct nft_chain_hook *hook,
2187                                     struct nft_chain *chain)
2188 {
2189         ops->pf                 = family;
2190         ops->hooknum            = hook->num;
2191         ops->priority           = hook->priority;
2192         ops->priv               = chain;
2193         ops->hook               = hook->type->hooks[ops->hooknum];
2194         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2195 }
2196
2197 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2198                               struct nft_chain_hook *hook, u32 flags)
2199 {
2200         struct nft_chain *chain;
2201         struct nft_hook *h;
2202
2203         basechain->type = hook->type;
2204         INIT_LIST_HEAD(&basechain->hook_list);
2205         chain = &basechain->chain;
2206
2207         if (nft_base_chain_netdev(family, hook->num)) {
2208                 list_splice_init(&hook->list, &basechain->hook_list);
2209                 list_for_each_entry(h, &basechain->hook_list, list)
2210                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2211         }
2212         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2213
2214         chain->flags |= NFT_CHAIN_BASE | flags;
2215         basechain->policy = NF_ACCEPT;
2216         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2217             !nft_chain_offload_support(basechain)) {
2218                 list_splice_init(&basechain->hook_list, &hook->list);
2219                 return -EOPNOTSUPP;
2220         }
2221
2222         flow_block_init(&basechain->flow_block);
2223
2224         return 0;
2225 }
2226
2227 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2228 {
2229         int err;
2230
2231         err = rhltable_insert_key(&table->chains_ht, chain->name,
2232                                   &chain->rhlhead, nft_chain_ht_params);
2233         if (err)
2234                 return err;
2235
2236         list_add_tail_rcu(&chain->list, &table->chains);
2237
2238         return 0;
2239 }
2240
2241 static u64 chain_id;
2242
2243 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2244                               u8 policy, u32 flags,
2245                               struct netlink_ext_ack *extack)
2246 {
2247         const struct nlattr * const *nla = ctx->nla;
2248         struct nft_table *table = ctx->table;
2249         struct nft_base_chain *basechain;
2250         struct net *net = ctx->net;
2251         char name[NFT_NAME_MAXLEN];
2252         struct nft_rule_blob *blob;
2253         struct nft_trans *trans;
2254         struct nft_chain *chain;
2255         int err;
2256
2257         if (table->use == UINT_MAX)
2258                 return -EOVERFLOW;
2259
2260         if (nla[NFTA_CHAIN_HOOK]) {
2261                 struct nft_stats __percpu *stats = NULL;
2262                 struct nft_chain_hook hook = {};
2263
2264                 if (flags & NFT_CHAIN_BINDING)
2265                         return -EOPNOTSUPP;
2266
2267                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2268                                            extack);
2269                 if (err < 0)
2270                         return err;
2271
2272                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2273                 if (basechain == NULL) {
2274                         nft_chain_release_hook(&hook);
2275                         return -ENOMEM;
2276                 }
2277                 chain = &basechain->chain;
2278
2279                 if (nla[NFTA_CHAIN_COUNTERS]) {
2280                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2281                         if (IS_ERR(stats)) {
2282                                 nft_chain_release_hook(&hook);
2283                                 kfree(basechain);
2284                                 return PTR_ERR(stats);
2285                         }
2286                         rcu_assign_pointer(basechain->stats, stats);
2287                 }
2288
2289                 err = nft_basechain_init(basechain, family, &hook, flags);
2290                 if (err < 0) {
2291                         nft_chain_release_hook(&hook);
2292                         kfree(basechain);
2293                         free_percpu(stats);
2294                         return err;
2295                 }
2296                 if (stats)
2297                         static_branch_inc(&nft_counters_enabled);
2298         } else {
2299                 if (flags & NFT_CHAIN_BASE)
2300                         return -EINVAL;
2301                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2302                         return -EOPNOTSUPP;
2303
2304                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2305                 if (chain == NULL)
2306                         return -ENOMEM;
2307
2308                 chain->flags = flags;
2309         }
2310         ctx->chain = chain;
2311
2312         INIT_LIST_HEAD(&chain->rules);
2313         chain->handle = nf_tables_alloc_handle(table);
2314         chain->table = table;
2315
2316         if (nla[NFTA_CHAIN_NAME]) {
2317                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2318         } else {
2319                 if (!(flags & NFT_CHAIN_BINDING)) {
2320                         err = -EINVAL;
2321                         goto err_destroy_chain;
2322                 }
2323
2324                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2325                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2326         }
2327
2328         if (!chain->name) {
2329                 err = -ENOMEM;
2330                 goto err_destroy_chain;
2331         }
2332
2333         if (nla[NFTA_CHAIN_USERDATA]) {
2334                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2335                 if (chain->udata == NULL) {
2336                         err = -ENOMEM;
2337                         goto err_destroy_chain;
2338                 }
2339                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2340         }
2341
2342         blob = nf_tables_chain_alloc_rules(chain, 0);
2343         if (!blob) {
2344                 err = -ENOMEM;
2345                 goto err_destroy_chain;
2346         }
2347
2348         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2349         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2350
2351         err = nf_tables_register_hook(net, table, chain);
2352         if (err < 0)
2353                 goto err_destroy_chain;
2354
2355         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2356         if (IS_ERR(trans)) {
2357                 err = PTR_ERR(trans);
2358                 goto err_unregister_hook;
2359         }
2360
2361         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2362         if (nft_is_base_chain(chain))
2363                 nft_trans_chain_policy(trans) = policy;
2364
2365         err = nft_chain_add(table, chain);
2366         if (err < 0) {
2367                 nft_trans_destroy(trans);
2368                 goto err_unregister_hook;
2369         }
2370
2371         table->use++;
2372
2373         return 0;
2374 err_unregister_hook:
2375         nf_tables_unregister_hook(net, table, chain);
2376 err_destroy_chain:
2377         nf_tables_chain_destroy(ctx);
2378
2379         return err;
2380 }
2381
2382 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2383                               u32 flags, const struct nlattr *attr,
2384                               struct netlink_ext_ack *extack)
2385 {
2386         const struct nlattr * const *nla = ctx->nla;
2387         struct nft_base_chain *basechain = NULL;
2388         struct nft_table *table = ctx->table;
2389         struct nft_chain *chain = ctx->chain;
2390         struct nft_chain_hook hook = {};
2391         struct nft_stats *stats = NULL;
2392         struct nft_hook *h, *next;
2393         struct nf_hook_ops *ops;
2394         struct nft_trans *trans;
2395         bool unregister = false;
2396         int err;
2397
2398         if (chain->flags ^ flags)
2399                 return -EOPNOTSUPP;
2400
2401         INIT_LIST_HEAD(&hook.list);
2402
2403         if (nla[NFTA_CHAIN_HOOK]) {
2404                 if (!nft_is_base_chain(chain)) {
2405                         NL_SET_BAD_ATTR(extack, attr);
2406                         return -EEXIST;
2407                 }
2408
2409                 basechain = nft_base_chain(chain);
2410                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2411                                            ctx->family, flags, extack);
2412                 if (err < 0)
2413                         return err;
2414
2415                 if (basechain->type != hook.type) {
2416                         nft_chain_release_hook(&hook);
2417                         NL_SET_BAD_ATTR(extack, attr);
2418                         return -EEXIST;
2419                 }
2420
2421                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2422                         list_for_each_entry_safe(h, next, &hook.list, list) {
2423                                 h->ops.pf       = basechain->ops.pf;
2424                                 h->ops.hooknum  = basechain->ops.hooknum;
2425                                 h->ops.priority = basechain->ops.priority;
2426                                 h->ops.priv     = basechain->ops.priv;
2427                                 h->ops.hook     = basechain->ops.hook;
2428
2429                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2430                                         list_del(&h->list);
2431                                         kfree(h);
2432                                 }
2433                         }
2434                 } else {
2435                         ops = &basechain->ops;
2436                         if (ops->hooknum != hook.num ||
2437                             ops->priority != hook.priority) {
2438                                 nft_chain_release_hook(&hook);
2439                                 NL_SET_BAD_ATTR(extack, attr);
2440                                 return -EEXIST;
2441                         }
2442                 }
2443         }
2444
2445         if (nla[NFTA_CHAIN_HANDLE] &&
2446             nla[NFTA_CHAIN_NAME]) {
2447                 struct nft_chain *chain2;
2448
2449                 chain2 = nft_chain_lookup(ctx->net, table,
2450                                           nla[NFTA_CHAIN_NAME], genmask);
2451                 if (!IS_ERR(chain2)) {
2452                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2453                         err = -EEXIST;
2454                         goto err_hooks;
2455                 }
2456         }
2457
2458         if (nla[NFTA_CHAIN_COUNTERS]) {
2459                 if (!nft_is_base_chain(chain)) {
2460                         err = -EOPNOTSUPP;
2461                         goto err_hooks;
2462                 }
2463
2464                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2465                 if (IS_ERR(stats)) {
2466                         err = PTR_ERR(stats);
2467                         goto err_hooks;
2468                 }
2469         }
2470
2471         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2472             nft_is_base_chain(chain) &&
2473             !list_empty(&hook.list)) {
2474                 basechain = nft_base_chain(chain);
2475                 ops = &basechain->ops;
2476
2477                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2478                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2479                         if (err < 0)
2480                                 goto err_hooks;
2481                 }
2482         }
2483
2484         unregister = true;
2485         err = -ENOMEM;
2486         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2487                                 sizeof(struct nft_trans_chain));
2488         if (trans == NULL)
2489                 goto err_trans;
2490
2491         nft_trans_chain_stats(trans) = stats;
2492         nft_trans_chain_update(trans) = true;
2493
2494         if (nla[NFTA_CHAIN_POLICY])
2495                 nft_trans_chain_policy(trans) = policy;
2496         else
2497                 nft_trans_chain_policy(trans) = -1;
2498
2499         if (nla[NFTA_CHAIN_HANDLE] &&
2500             nla[NFTA_CHAIN_NAME]) {
2501                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2502                 struct nft_trans *tmp;
2503                 char *name;
2504
2505                 err = -ENOMEM;
2506                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2507                 if (!name)
2508                         goto err_trans;
2509
2510                 err = -EEXIST;
2511                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2512                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2513                             tmp->ctx.table == table &&
2514                             nft_trans_chain_update(tmp) &&
2515                             nft_trans_chain_name(tmp) &&
2516                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2517                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2518                                 kfree(name);
2519                                 goto err_trans;
2520                         }
2521                 }
2522
2523                 nft_trans_chain_name(trans) = name;
2524         }
2525
2526         nft_trans_basechain(trans) = basechain;
2527         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2528         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2529
2530         nft_trans_commit_list_add_tail(ctx->net, trans);
2531
2532         return 0;
2533
2534 err_trans:
2535         free_percpu(stats);
2536         kfree(trans);
2537 err_hooks:
2538         if (nla[NFTA_CHAIN_HOOK]) {
2539                 list_for_each_entry_safe(h, next, &hook.list, list) {
2540                         if (unregister)
2541                                 nf_unregister_net_hook(ctx->net, &h->ops);
2542                         list_del(&h->list);
2543                         kfree_rcu(h, rcu);
2544                 }
2545                 module_put(hook.type->owner);
2546         }
2547
2548         return err;
2549 }
2550
2551 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2552                                                const struct nft_table *table,
2553                                                const struct nlattr *nla)
2554 {
2555         struct nftables_pernet *nft_net = nft_pernet(net);
2556         u32 id = ntohl(nla_get_be32(nla));
2557         struct nft_trans *trans;
2558
2559         list_for_each_entry(trans, &nft_net->commit_list, list) {
2560                 struct nft_chain *chain = trans->ctx.chain;
2561
2562                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2563                     chain->table == table &&
2564                     id == nft_trans_chain_id(trans))
2565                         return chain;
2566         }
2567         return ERR_PTR(-ENOENT);
2568 }
2569
2570 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2571                               const struct nlattr * const nla[])
2572 {
2573         struct nftables_pernet *nft_net = nft_pernet(info->net);
2574         struct netlink_ext_ack *extack = info->extack;
2575         u8 genmask = nft_genmask_next(info->net);
2576         u8 family = info->nfmsg->nfgen_family;
2577         struct nft_chain *chain = NULL;
2578         struct net *net = info->net;
2579         const struct nlattr *attr;
2580         struct nft_table *table;
2581         u8 policy = NF_ACCEPT;
2582         struct nft_ctx ctx;
2583         u64 handle = 0;
2584         u32 flags = 0;
2585
2586         lockdep_assert_held(&nft_net->commit_mutex);
2587
2588         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2589                                  NETLINK_CB(skb).portid);
2590         if (IS_ERR(table)) {
2591                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2592                 return PTR_ERR(table);
2593         }
2594
2595         chain = NULL;
2596         attr = nla[NFTA_CHAIN_NAME];
2597
2598         if (nla[NFTA_CHAIN_HANDLE]) {
2599                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2600                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2601                 if (IS_ERR(chain)) {
2602                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2603                         return PTR_ERR(chain);
2604                 }
2605                 attr = nla[NFTA_CHAIN_HANDLE];
2606         } else if (nla[NFTA_CHAIN_NAME]) {
2607                 chain = nft_chain_lookup(net, table, attr, genmask);
2608                 if (IS_ERR(chain)) {
2609                         if (PTR_ERR(chain) != -ENOENT) {
2610                                 NL_SET_BAD_ATTR(extack, attr);
2611                                 return PTR_ERR(chain);
2612                         }
2613                         chain = NULL;
2614                 }
2615         } else if (!nla[NFTA_CHAIN_ID]) {
2616                 return -EINVAL;
2617         }
2618
2619         if (nla[NFTA_CHAIN_POLICY]) {
2620                 if (chain != NULL &&
2621                     !nft_is_base_chain(chain)) {
2622                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2623                         return -EOPNOTSUPP;
2624                 }
2625
2626                 if (chain == NULL &&
2627                     nla[NFTA_CHAIN_HOOK] == NULL) {
2628                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2629                         return -EOPNOTSUPP;
2630                 }
2631
2632                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2633                 switch (policy) {
2634                 case NF_DROP:
2635                 case NF_ACCEPT:
2636                         break;
2637                 default:
2638                         return -EINVAL;
2639                 }
2640         }
2641
2642         if (nla[NFTA_CHAIN_FLAGS])
2643                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2644         else if (chain)
2645                 flags = chain->flags;
2646
2647         if (flags & ~NFT_CHAIN_FLAGS)
2648                 return -EOPNOTSUPP;
2649
2650         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2651
2652         if (chain != NULL) {
2653                 if (chain->flags & NFT_CHAIN_BINDING)
2654                         return -EINVAL;
2655
2656                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2657                         NL_SET_BAD_ATTR(extack, attr);
2658                         return -EEXIST;
2659                 }
2660                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2661                         return -EOPNOTSUPP;
2662
2663                 flags |= chain->flags & NFT_CHAIN_BASE;
2664                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2665                                           extack);
2666         }
2667
2668         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2669 }
2670
2671 static int nft_delchain_hook(struct nft_ctx *ctx, struct nft_chain *chain,
2672                              struct netlink_ext_ack *extack)
2673 {
2674         const struct nlattr * const *nla = ctx->nla;
2675         struct nft_chain_hook chain_hook = {};
2676         struct nft_base_chain *basechain;
2677         struct nft_hook *this, *hook;
2678         LIST_HEAD(chain_del_list);
2679         struct nft_trans *trans;
2680         int err;
2681
2682         if (!nft_is_base_chain(chain))
2683                 return -EOPNOTSUPP;
2684
2685         basechain = nft_base_chain(chain);
2686         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2687                                    ctx->family, chain->flags, extack);
2688         if (err < 0)
2689                 return err;
2690
2691         list_for_each_entry(this, &chain_hook.list, list) {
2692                 hook = nft_hook_list_find(&basechain->hook_list, this);
2693                 if (!hook) {
2694                         err = -ENOENT;
2695                         goto err_chain_del_hook;
2696                 }
2697                 list_move(&hook->list, &chain_del_list);
2698         }
2699
2700         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2701                                 sizeof(struct nft_trans_chain));
2702         if (!trans) {
2703                 err = -ENOMEM;
2704                 goto err_chain_del_hook;
2705         }
2706
2707         nft_trans_basechain(trans) = basechain;
2708         nft_trans_chain_update(trans) = true;
2709         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2710         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2711         nft_chain_release_hook(&chain_hook);
2712
2713         nft_trans_commit_list_add_tail(ctx->net, trans);
2714
2715         return 0;
2716
2717 err_chain_del_hook:
2718         list_splice(&chain_del_list, &basechain->hook_list);
2719         nft_chain_release_hook(&chain_hook);
2720
2721         return err;
2722 }
2723
2724 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2725                               const struct nlattr * const nla[])
2726 {
2727         struct netlink_ext_ack *extack = info->extack;
2728         u8 genmask = nft_genmask_next(info->net);
2729         u8 family = info->nfmsg->nfgen_family;
2730         struct net *net = info->net;
2731         const struct nlattr *attr;
2732         struct nft_table *table;
2733         struct nft_chain *chain;
2734         struct nft_rule *rule;
2735         struct nft_ctx ctx;
2736         u64 handle;
2737         u32 use;
2738         int err;
2739
2740         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2741                                  NETLINK_CB(skb).portid);
2742         if (IS_ERR(table)) {
2743                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2744                 return PTR_ERR(table);
2745         }
2746
2747         if (nla[NFTA_CHAIN_HANDLE]) {
2748                 attr = nla[NFTA_CHAIN_HANDLE];
2749                 handle = be64_to_cpu(nla_get_be64(attr));
2750                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2751         } else {
2752                 attr = nla[NFTA_CHAIN_NAME];
2753                 chain = nft_chain_lookup(net, table, attr, genmask);
2754         }
2755         if (IS_ERR(chain)) {
2756                 if (PTR_ERR(chain) == -ENOENT &&
2757                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2758                         return 0;
2759
2760                 NL_SET_BAD_ATTR(extack, attr);
2761                 return PTR_ERR(chain);
2762         }
2763
2764         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2765
2766         if (nla[NFTA_CHAIN_HOOK]) {
2767                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2768                         return -EOPNOTSUPP;
2769
2770                 return nft_delchain_hook(&ctx, chain, extack);
2771         }
2772
2773         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2774             chain->use > 0)
2775                 return -EBUSY;
2776
2777         use = chain->use;
2778         list_for_each_entry(rule, &chain->rules, list) {
2779                 if (!nft_is_active_next(net, rule))
2780                         continue;
2781                 use--;
2782
2783                 err = nft_delrule(&ctx, rule);
2784                 if (err < 0)
2785                         return err;
2786         }
2787
2788         /* There are rules and elements that are still holding references to us,
2789          * we cannot do a recursive removal in this case.
2790          */
2791         if (use > 0) {
2792                 NL_SET_BAD_ATTR(extack, attr);
2793                 return -EBUSY;
2794         }
2795
2796         return nft_delchain(&ctx);
2797 }
2798
2799 /*
2800  * Expressions
2801  */
2802
2803 /**
2804  *      nft_register_expr - register nf_tables expr type
2805  *      @type: expr type
2806  *
2807  *      Registers the expr type for use with nf_tables. Returns zero on
2808  *      success or a negative errno code otherwise.
2809  */
2810 int nft_register_expr(struct nft_expr_type *type)
2811 {
2812         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2813         if (type->family == NFPROTO_UNSPEC)
2814                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2815         else
2816                 list_add_rcu(&type->list, &nf_tables_expressions);
2817         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2818         return 0;
2819 }
2820 EXPORT_SYMBOL_GPL(nft_register_expr);
2821
2822 /**
2823  *      nft_unregister_expr - unregister nf_tables expr type
2824  *      @type: expr type
2825  *
2826  *      Unregisters the expr typefor use with nf_tables.
2827  */
2828 void nft_unregister_expr(struct nft_expr_type *type)
2829 {
2830         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2831         list_del_rcu(&type->list);
2832         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2833 }
2834 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2835
2836 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2837                                                        struct nlattr *nla)
2838 {
2839         const struct nft_expr_type *type, *candidate = NULL;
2840
2841         list_for_each_entry(type, &nf_tables_expressions, list) {
2842                 if (!nla_strcmp(nla, type->name)) {
2843                         if (!type->family && !candidate)
2844                                 candidate = type;
2845                         else if (type->family == family)
2846                                 candidate = type;
2847                 }
2848         }
2849         return candidate;
2850 }
2851
2852 #ifdef CONFIG_MODULES
2853 static int nft_expr_type_request_module(struct net *net, u8 family,
2854                                         struct nlattr *nla)
2855 {
2856         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2857                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2858                 return -EAGAIN;
2859
2860         return 0;
2861 }
2862 #endif
2863
2864 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2865                                                      u8 family,
2866                                                      struct nlattr *nla)
2867 {
2868         const struct nft_expr_type *type;
2869
2870         if (nla == NULL)
2871                 return ERR_PTR(-EINVAL);
2872
2873         type = __nft_expr_type_get(family, nla);
2874         if (type != NULL && try_module_get(type->owner))
2875                 return type;
2876
2877         lockdep_nfnl_nft_mutex_not_held();
2878 #ifdef CONFIG_MODULES
2879         if (type == NULL) {
2880                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2881                         return ERR_PTR(-EAGAIN);
2882
2883                 if (nft_request_module(net, "nft-expr-%.*s",
2884                                        nla_len(nla),
2885                                        (char *)nla_data(nla)) == -EAGAIN)
2886                         return ERR_PTR(-EAGAIN);
2887         }
2888 #endif
2889         return ERR_PTR(-ENOENT);
2890 }
2891
2892 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2893         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2894                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2895         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2896 };
2897
2898 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2899                                     const struct nft_expr *expr, bool reset)
2900 {
2901         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2902                 goto nla_put_failure;
2903
2904         if (expr->ops->dump) {
2905                 struct nlattr *data = nla_nest_start_noflag(skb,
2906                                                             NFTA_EXPR_DATA);
2907                 if (data == NULL)
2908                         goto nla_put_failure;
2909                 if (expr->ops->dump(skb, expr, reset) < 0)
2910                         goto nla_put_failure;
2911                 nla_nest_end(skb, data);
2912         }
2913
2914         return skb->len;
2915
2916 nla_put_failure:
2917         return -1;
2918 };
2919
2920 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2921                   const struct nft_expr *expr, bool reset)
2922 {
2923         struct nlattr *nest;
2924
2925         nest = nla_nest_start_noflag(skb, attr);
2926         if (!nest)
2927                 goto nla_put_failure;
2928         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2929                 goto nla_put_failure;
2930         nla_nest_end(skb, nest);
2931         return 0;
2932
2933 nla_put_failure:
2934         return -1;
2935 }
2936
2937 struct nft_expr_info {
2938         const struct nft_expr_ops       *ops;
2939         const struct nlattr             *attr;
2940         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2941 };
2942
2943 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2944                                 const struct nlattr *nla,
2945                                 struct nft_expr_info *info)
2946 {
2947         const struct nft_expr_type *type;
2948         const struct nft_expr_ops *ops;
2949         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2950         int err;
2951
2952         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2953                                           nft_expr_policy, NULL);
2954         if (err < 0)
2955                 return err;
2956
2957         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2958         if (IS_ERR(type))
2959                 return PTR_ERR(type);
2960
2961         if (tb[NFTA_EXPR_DATA]) {
2962                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2963                                                   tb[NFTA_EXPR_DATA],
2964                                                   type->policy, NULL);
2965                 if (err < 0)
2966                         goto err1;
2967         } else
2968                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2969
2970         if (type->select_ops != NULL) {
2971                 ops = type->select_ops(ctx,
2972                                        (const struct nlattr * const *)info->tb);
2973                 if (IS_ERR(ops)) {
2974                         err = PTR_ERR(ops);
2975 #ifdef CONFIG_MODULES
2976                         if (err == -EAGAIN)
2977                                 if (nft_expr_type_request_module(ctx->net,
2978                                                                  ctx->family,
2979                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2980                                         err = -ENOENT;
2981 #endif
2982                         goto err1;
2983                 }
2984         } else
2985                 ops = type->ops;
2986
2987         info->attr = nla;
2988         info->ops = ops;
2989
2990         return 0;
2991
2992 err1:
2993         module_put(type->owner);
2994         return err;
2995 }
2996
2997 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2998                          struct nft_expr_info *info)
2999 {
3000         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3001         const struct nft_expr_type *type;
3002         int err;
3003
3004         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3005                                           nft_expr_policy, NULL);
3006         if (err < 0)
3007                 return err;
3008
3009         if (!tb[NFTA_EXPR_DATA])
3010                 return -EINVAL;
3011
3012         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3013         if (!type)
3014                 return -ENOENT;
3015
3016         if (!type->inner_ops)
3017                 return -EOPNOTSUPP;
3018
3019         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3020                                           tb[NFTA_EXPR_DATA],
3021                                           type->policy, NULL);
3022         if (err < 0)
3023                 goto err_nla_parse;
3024
3025         info->attr = nla;
3026         info->ops = type->inner_ops;
3027
3028         return 0;
3029
3030 err_nla_parse:
3031         return err;
3032 }
3033
3034 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3035                              const struct nft_expr_info *expr_info,
3036                              struct nft_expr *expr)
3037 {
3038         const struct nft_expr_ops *ops = expr_info->ops;
3039         int err;
3040
3041         expr->ops = ops;
3042         if (ops->init) {
3043                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3044                 if (err < 0)
3045                         goto err1;
3046         }
3047
3048         return 0;
3049 err1:
3050         expr->ops = NULL;
3051         return err;
3052 }
3053
3054 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3055                                    struct nft_expr *expr)
3056 {
3057         const struct nft_expr_type *type = expr->ops->type;
3058
3059         if (expr->ops->destroy)
3060                 expr->ops->destroy(ctx, expr);
3061         module_put(type->owner);
3062 }
3063
3064 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3065                                       const struct nlattr *nla)
3066 {
3067         struct nft_expr_info expr_info;
3068         struct nft_expr *expr;
3069         struct module *owner;
3070         int err;
3071
3072         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3073         if (err < 0)
3074                 goto err_expr_parse;
3075
3076         err = -EOPNOTSUPP;
3077         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3078                 goto err_expr_stateful;
3079
3080         err = -ENOMEM;
3081         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3082         if (expr == NULL)
3083                 goto err_expr_stateful;
3084
3085         err = nf_tables_newexpr(ctx, &expr_info, expr);
3086         if (err < 0)
3087                 goto err_expr_new;
3088
3089         return expr;
3090 err_expr_new:
3091         kfree(expr);
3092 err_expr_stateful:
3093         owner = expr_info.ops->type->owner;
3094         if (expr_info.ops->type->release_ops)
3095                 expr_info.ops->type->release_ops(expr_info.ops);
3096
3097         module_put(owner);
3098 err_expr_parse:
3099         return ERR_PTR(err);
3100 }
3101
3102 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3103 {
3104         int err;
3105
3106         if (src->ops->clone) {
3107                 dst->ops = src->ops;
3108                 err = src->ops->clone(dst, src);
3109                 if (err < 0)
3110                         return err;
3111         } else {
3112                 memcpy(dst, src, src->ops->size);
3113         }
3114
3115         __module_get(src->ops->type->owner);
3116
3117         return 0;
3118 }
3119
3120 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3121 {
3122         nf_tables_expr_destroy(ctx, expr);
3123         kfree(expr);
3124 }
3125
3126 /*
3127  * Rules
3128  */
3129
3130 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3131                                           u64 handle)
3132 {
3133         struct nft_rule *rule;
3134
3135         // FIXME: this sucks
3136         list_for_each_entry_rcu(rule, &chain->rules, list) {
3137                 if (handle == rule->handle)
3138                         return rule;
3139         }
3140
3141         return ERR_PTR(-ENOENT);
3142 }
3143
3144 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3145                                         const struct nlattr *nla)
3146 {
3147         if (nla == NULL)
3148                 return ERR_PTR(-EINVAL);
3149
3150         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3151 }
3152
3153 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3154         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3155                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3156         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3157                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3158         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3159         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3160         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3161         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3162         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3163                                     .len = NFT_USERDATA_MAXLEN },
3164         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3165         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3166         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3167 };
3168
3169 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3170                                     u32 portid, u32 seq, int event,
3171                                     u32 flags, int family,
3172                                     const struct nft_table *table,
3173                                     const struct nft_chain *chain,
3174                                     const struct nft_rule *rule, u64 handle,
3175                                     bool reset)
3176 {
3177         struct nlmsghdr *nlh;
3178         const struct nft_expr *expr, *next;
3179         struct nlattr *list;
3180         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3181
3182         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3183                            nft_base_seq(net));
3184         if (!nlh)
3185                 goto nla_put_failure;
3186
3187         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3188                 goto nla_put_failure;
3189         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3190                 goto nla_put_failure;
3191         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3192                          NFTA_RULE_PAD))
3193                 goto nla_put_failure;
3194
3195         if (event != NFT_MSG_DELRULE && handle) {
3196                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3197                                  NFTA_RULE_PAD))
3198                         goto nla_put_failure;
3199         }
3200
3201         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3202                 nft_flow_rule_stats(chain, rule);
3203
3204         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3205         if (list == NULL)
3206                 goto nla_put_failure;
3207         nft_rule_for_each_expr(expr, next, rule) {
3208                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3209                         goto nla_put_failure;
3210         }
3211         nla_nest_end(skb, list);
3212
3213         if (rule->udata) {
3214                 struct nft_userdata *udata = nft_userdata(rule);
3215                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3216                             udata->data) < 0)
3217                         goto nla_put_failure;
3218         }
3219
3220         nlmsg_end(skb, nlh);
3221         return 0;
3222
3223 nla_put_failure:
3224         nlmsg_trim(skb, nlh);
3225         return -1;
3226 }
3227
3228 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3229                                   const struct nft_rule *rule, int event)
3230 {
3231         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3232         const struct nft_rule *prule;
3233         struct sk_buff *skb;
3234         u64 handle = 0;
3235         u16 flags = 0;
3236         int err;
3237
3238         if (!ctx->report &&
3239             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3240                 return;
3241
3242         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3243         if (skb == NULL)
3244                 goto err;
3245
3246         if (event == NFT_MSG_NEWRULE &&
3247             !list_is_first(&rule->list, &ctx->chain->rules) &&
3248             !list_is_last(&rule->list, &ctx->chain->rules)) {
3249                 prule = list_prev_entry(rule, list);
3250                 handle = prule->handle;
3251         }
3252         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3253                 flags |= NLM_F_APPEND;
3254         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3255                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3256
3257         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3258                                        event, flags, ctx->family, ctx->table,
3259                                        ctx->chain, rule, handle, false);
3260         if (err < 0) {
3261                 kfree_skb(skb);
3262                 goto err;
3263         }
3264
3265         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3266         return;
3267 err:
3268         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3269 }
3270
3271 struct nft_rule_dump_ctx {
3272         char *table;
3273         char *chain;
3274 };
3275
3276 static int __nf_tables_dump_rules(struct sk_buff *skb,
3277                                   unsigned int *idx,
3278                                   struct netlink_callback *cb,
3279                                   const struct nft_table *table,
3280                                   const struct nft_chain *chain,
3281                                   bool reset)
3282 {
3283         struct net *net = sock_net(skb->sk);
3284         const struct nft_rule *rule, *prule;
3285         unsigned int s_idx = cb->args[0];
3286         u64 handle;
3287
3288         prule = NULL;
3289         list_for_each_entry_rcu(rule, &chain->rules, list) {
3290                 if (!nft_is_active(net, rule))
3291                         goto cont_skip;
3292                 if (*idx < s_idx)
3293                         goto cont;
3294                 if (*idx > s_idx) {
3295                         memset(&cb->args[1], 0,
3296                                         sizeof(cb->args) - sizeof(cb->args[0]));
3297                 }
3298                 if (prule)
3299                         handle = prule->handle;
3300                 else
3301                         handle = 0;
3302
3303                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3304                                         cb->nlh->nlmsg_seq,
3305                                         NFT_MSG_NEWRULE,
3306                                         NLM_F_MULTI | NLM_F_APPEND,
3307                                         table->family,
3308                                         table, chain, rule, handle, reset) < 0)
3309                         return 1;
3310
3311                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3312 cont:
3313                 prule = rule;
3314 cont_skip:
3315                 (*idx)++;
3316         }
3317         return 0;
3318 }
3319
3320 static int nf_tables_dump_rules(struct sk_buff *skb,
3321                                 struct netlink_callback *cb)
3322 {
3323         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3324         const struct nft_rule_dump_ctx *ctx = cb->data;
3325         struct nft_table *table;
3326         const struct nft_chain *chain;
3327         unsigned int idx = 0;
3328         struct net *net = sock_net(skb->sk);
3329         int family = nfmsg->nfgen_family;
3330         struct nftables_pernet *nft_net;
3331         bool reset = false;
3332
3333         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3334                 reset = true;
3335
3336         rcu_read_lock();
3337         nft_net = nft_pernet(net);
3338         cb->seq = READ_ONCE(nft_net->base_seq);
3339
3340         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3341                 if (family != NFPROTO_UNSPEC && family != table->family)
3342                         continue;
3343
3344                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3345                         continue;
3346
3347                 if (ctx && ctx->table && ctx->chain) {
3348                         struct rhlist_head *list, *tmp;
3349
3350                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3351                                                nft_chain_ht_params);
3352                         if (!list)
3353                                 goto done;
3354
3355                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3356                                 if (!nft_is_active(net, chain))
3357                                         continue;
3358                                 __nf_tables_dump_rules(skb, &idx,
3359                                                        cb, table, chain, reset);
3360                                 break;
3361                         }
3362                         goto done;
3363                 }
3364
3365                 list_for_each_entry_rcu(chain, &table->chains, list) {
3366                         if (__nf_tables_dump_rules(skb, &idx,
3367                                                    cb, table, chain, reset))
3368                                 goto done;
3369                 }
3370
3371                 if (ctx && ctx->table)
3372                         break;
3373         }
3374 done:
3375         rcu_read_unlock();
3376
3377         cb->args[0] = idx;
3378         return skb->len;
3379 }
3380
3381 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3382 {
3383         const struct nlattr * const *nla = cb->data;
3384         struct nft_rule_dump_ctx *ctx = NULL;
3385
3386         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3387                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3388                 if (!ctx)
3389                         return -ENOMEM;
3390
3391                 if (nla[NFTA_RULE_TABLE]) {
3392                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3393                                                         GFP_ATOMIC);
3394                         if (!ctx->table) {
3395                                 kfree(ctx);
3396                                 return -ENOMEM;
3397                         }
3398                 }
3399                 if (nla[NFTA_RULE_CHAIN]) {
3400                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3401                                                 GFP_ATOMIC);
3402                         if (!ctx->chain) {
3403                                 kfree(ctx->table);
3404                                 kfree(ctx);
3405                                 return -ENOMEM;
3406                         }
3407                 }
3408         }
3409
3410         cb->data = ctx;
3411         return 0;
3412 }
3413
3414 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3415 {
3416         struct nft_rule_dump_ctx *ctx = cb->data;
3417
3418         if (ctx) {
3419                 kfree(ctx->table);
3420                 kfree(ctx->chain);
3421                 kfree(ctx);
3422         }
3423         return 0;
3424 }
3425
3426 /* called with rcu_read_lock held */
3427 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3428                              const struct nlattr * const nla[])
3429 {
3430         struct netlink_ext_ack *extack = info->extack;
3431         u8 genmask = nft_genmask_cur(info->net);
3432         u8 family = info->nfmsg->nfgen_family;
3433         const struct nft_chain *chain;
3434         const struct nft_rule *rule;
3435         struct net *net = info->net;
3436         struct nft_table *table;
3437         struct sk_buff *skb2;
3438         bool reset = false;
3439         int err;
3440
3441         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3442                 struct netlink_dump_control c = {
3443                         .start= nf_tables_dump_rules_start,
3444                         .dump = nf_tables_dump_rules,
3445                         .done = nf_tables_dump_rules_done,
3446                         .module = THIS_MODULE,
3447                         .data = (void *)nla,
3448                 };
3449
3450                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3451         }
3452
3453         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3454         if (IS_ERR(table)) {
3455                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3456                 return PTR_ERR(table);
3457         }
3458
3459         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3460         if (IS_ERR(chain)) {
3461                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3462                 return PTR_ERR(chain);
3463         }
3464
3465         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3466         if (IS_ERR(rule)) {
3467                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3468                 return PTR_ERR(rule);
3469         }
3470
3471         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3472         if (!skb2)
3473                 return -ENOMEM;
3474
3475         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3476                 reset = true;
3477
3478         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3479                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3480                                        family, table, chain, rule, 0, reset);
3481         if (err < 0)
3482                 goto err_fill_rule_info;
3483
3484         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3485
3486 err_fill_rule_info:
3487         kfree_skb(skb2);
3488         return err;
3489 }
3490
3491 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3492                                    struct nft_rule *rule)
3493 {
3494         struct nft_expr *expr, *next;
3495
3496         /*
3497          * Careful: some expressions might not be initialized in case this
3498          * is called on error from nf_tables_newrule().
3499          */
3500         expr = nft_expr_first(rule);
3501         while (nft_expr_more(rule, expr)) {
3502                 next = nft_expr_next(expr);
3503                 nf_tables_expr_destroy(ctx, expr);
3504                 expr = next;
3505         }
3506         kfree(rule);
3507 }
3508
3509 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3510 {
3511         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3512         nf_tables_rule_destroy(ctx, rule);
3513 }
3514
3515 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3516 {
3517         struct nft_expr *expr, *last;
3518         const struct nft_data *data;
3519         struct nft_rule *rule;
3520         int err;
3521
3522         if (ctx->level == NFT_JUMP_STACK_SIZE)
3523                 return -EMLINK;
3524
3525         list_for_each_entry(rule, &chain->rules, list) {
3526                 if (!nft_is_active_next(ctx->net, rule))
3527                         continue;
3528
3529                 nft_rule_for_each_expr(expr, last, rule) {
3530                         if (!expr->ops->validate)
3531                                 continue;
3532
3533                         err = expr->ops->validate(ctx, expr, &data);
3534                         if (err < 0)
3535                                 return err;
3536                 }
3537
3538                 cond_resched();
3539         }
3540
3541         return 0;
3542 }
3543 EXPORT_SYMBOL_GPL(nft_chain_validate);
3544
3545 static int nft_table_validate(struct net *net, const struct nft_table *table)
3546 {
3547         struct nft_chain *chain;
3548         struct nft_ctx ctx = {
3549                 .net    = net,
3550                 .family = table->family,
3551         };
3552         int err;
3553
3554         list_for_each_entry(chain, &table->chains, list) {
3555                 if (!nft_is_base_chain(chain))
3556                         continue;
3557
3558                 ctx.chain = chain;
3559                 err = nft_chain_validate(&ctx, chain);
3560                 if (err < 0)
3561                         return err;
3562         }
3563
3564         return 0;
3565 }
3566
3567 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3568                          const struct nft_set_iter *iter,
3569                          struct nft_set_elem *elem)
3570 {
3571         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3572         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3573         const struct nft_data *data;
3574         int err;
3575
3576         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3577             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3578                 return 0;
3579
3580         data = nft_set_ext_data(ext);
3581         switch (data->verdict.code) {
3582         case NFT_JUMP:
3583         case NFT_GOTO:
3584                 pctx->level++;
3585                 err = nft_chain_validate(ctx, data->verdict.chain);
3586                 if (err < 0)
3587                         return err;
3588                 pctx->level--;
3589                 break;
3590         default:
3591                 break;
3592         }
3593
3594         return 0;
3595 }
3596
3597 struct nft_set_elem_catchall {
3598         struct list_head        list;
3599         struct rcu_head         rcu;
3600         void                    *elem;
3601 };
3602
3603 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3604 {
3605         u8 genmask = nft_genmask_next(ctx->net);
3606         struct nft_set_elem_catchall *catchall;
3607         struct nft_set_elem elem;
3608         struct nft_set_ext *ext;
3609         int ret = 0;
3610
3611         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3612                 ext = nft_set_elem_ext(set, catchall->elem);
3613                 if (!nft_set_elem_active(ext, genmask))
3614                         continue;
3615
3616                 elem.priv = catchall->elem;
3617                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3618                 if (ret < 0)
3619                         return ret;
3620         }
3621
3622         return ret;
3623 }
3624
3625 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3626                                              const struct nft_chain *chain,
3627                                              const struct nlattr *nla);
3628
3629 #define NFT_RULE_MAXEXPRS       128
3630
3631 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3632                              const struct nlattr * const nla[])
3633 {
3634         struct nftables_pernet *nft_net = nft_pernet(info->net);
3635         struct netlink_ext_ack *extack = info->extack;
3636         unsigned int size, i, n, ulen = 0, usize = 0;
3637         u8 genmask = nft_genmask_next(info->net);
3638         struct nft_rule *rule, *old_rule = NULL;
3639         struct nft_expr_info *expr_info = NULL;
3640         u8 family = info->nfmsg->nfgen_family;
3641         struct nft_flow_rule *flow = NULL;
3642         struct net *net = info->net;
3643         struct nft_userdata *udata;
3644         struct nft_table *table;
3645         struct nft_chain *chain;
3646         struct nft_trans *trans;
3647         u64 handle, pos_handle;
3648         struct nft_expr *expr;
3649         struct nft_ctx ctx;
3650         struct nlattr *tmp;
3651         int err, rem;
3652
3653         lockdep_assert_held(&nft_net->commit_mutex);
3654
3655         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3656                                  NETLINK_CB(skb).portid);
3657         if (IS_ERR(table)) {
3658                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3659                 return PTR_ERR(table);
3660         }
3661
3662         if (nla[NFTA_RULE_CHAIN]) {
3663                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3664                                          genmask);
3665                 if (IS_ERR(chain)) {
3666                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3667                         return PTR_ERR(chain);
3668                 }
3669                 if (nft_chain_is_bound(chain))
3670                         return -EOPNOTSUPP;
3671
3672         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3673                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3674                 if (IS_ERR(chain)) {
3675                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3676                         return PTR_ERR(chain);
3677                 }
3678         } else {
3679                 return -EINVAL;
3680         }
3681
3682         if (nla[NFTA_RULE_HANDLE]) {
3683                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3684                 rule = __nft_rule_lookup(chain, handle);
3685                 if (IS_ERR(rule)) {
3686                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3687                         return PTR_ERR(rule);
3688                 }
3689
3690                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3691                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3692                         return -EEXIST;
3693                 }
3694                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3695                         old_rule = rule;
3696                 else
3697                         return -EOPNOTSUPP;
3698         } else {
3699                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3700                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3701                         return -EINVAL;
3702                 handle = nf_tables_alloc_handle(table);
3703
3704                 if (chain->use == UINT_MAX)
3705                         return -EOVERFLOW;
3706
3707                 if (nla[NFTA_RULE_POSITION]) {
3708                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3709                         old_rule = __nft_rule_lookup(chain, pos_handle);
3710                         if (IS_ERR(old_rule)) {
3711                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3712                                 return PTR_ERR(old_rule);
3713                         }
3714                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3715                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3716                         if (IS_ERR(old_rule)) {
3717                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3718                                 return PTR_ERR(old_rule);
3719                         }
3720                 }
3721         }
3722
3723         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3724
3725         n = 0;
3726         size = 0;
3727         if (nla[NFTA_RULE_EXPRESSIONS]) {
3728                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3729                                            sizeof(struct nft_expr_info),
3730                                            GFP_KERNEL);
3731                 if (!expr_info)
3732                         return -ENOMEM;
3733
3734                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3735                         err = -EINVAL;
3736                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3737                                 goto err_release_expr;
3738                         if (n == NFT_RULE_MAXEXPRS)
3739                                 goto err_release_expr;
3740                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3741                         if (err < 0) {
3742                                 NL_SET_BAD_ATTR(extack, tmp);
3743                                 goto err_release_expr;
3744                         }
3745                         size += expr_info[n].ops->size;
3746                         n++;
3747                 }
3748         }
3749         /* Check for overflow of dlen field */
3750         err = -EFBIG;
3751         if (size >= 1 << 12)
3752                 goto err_release_expr;
3753
3754         if (nla[NFTA_RULE_USERDATA]) {
3755                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3756                 if (ulen > 0)
3757                         usize = sizeof(struct nft_userdata) + ulen;
3758         }
3759
3760         err = -ENOMEM;
3761         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3762         if (rule == NULL)
3763                 goto err_release_expr;
3764
3765         nft_activate_next(net, rule);
3766
3767         rule->handle = handle;
3768         rule->dlen   = size;
3769         rule->udata  = ulen ? 1 : 0;
3770
3771         if (ulen) {
3772                 udata = nft_userdata(rule);
3773                 udata->len = ulen - 1;
3774                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3775         }
3776
3777         expr = nft_expr_first(rule);
3778         for (i = 0; i < n; i++) {
3779                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3780                 if (err < 0) {
3781                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3782                         goto err_release_rule;
3783                 }
3784
3785                 if (expr_info[i].ops->validate)
3786                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3787
3788                 expr_info[i].ops = NULL;
3789                 expr = nft_expr_next(expr);
3790         }
3791
3792         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3793                 flow = nft_flow_rule_create(net, rule);
3794                 if (IS_ERR(flow)) {
3795                         err = PTR_ERR(flow);
3796                         goto err_release_rule;
3797                 }
3798         }
3799
3800         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3801                 err = nft_delrule(&ctx, old_rule);
3802                 if (err < 0)
3803                         goto err_destroy_flow_rule;
3804
3805                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3806                 if (trans == NULL) {
3807                         err = -ENOMEM;
3808                         goto err_destroy_flow_rule;
3809                 }
3810                 list_add_tail_rcu(&rule->list, &old_rule->list);
3811         } else {
3812                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3813                 if (!trans) {
3814                         err = -ENOMEM;
3815                         goto err_destroy_flow_rule;
3816                 }
3817
3818                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3819                         if (old_rule)
3820                                 list_add_rcu(&rule->list, &old_rule->list);
3821                         else
3822                                 list_add_tail_rcu(&rule->list, &chain->rules);
3823                  } else {
3824                         if (old_rule)
3825                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3826                         else
3827                                 list_add_rcu(&rule->list, &chain->rules);
3828                 }
3829         }
3830         kvfree(expr_info);
3831         chain->use++;
3832
3833         if (flow)
3834                 nft_trans_flow_rule(trans) = flow;
3835
3836         if (table->validate_state == NFT_VALIDATE_DO)
3837                 return nft_table_validate(net, table);
3838
3839         return 0;
3840
3841 err_destroy_flow_rule:
3842         if (flow)
3843                 nft_flow_rule_destroy(flow);
3844 err_release_rule:
3845         nf_tables_rule_release(&ctx, rule);
3846 err_release_expr:
3847         for (i = 0; i < n; i++) {
3848                 if (expr_info[i].ops) {
3849                         module_put(expr_info[i].ops->type->owner);
3850                         if (expr_info[i].ops->type->release_ops)
3851                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3852                 }
3853         }
3854         kvfree(expr_info);
3855
3856         return err;
3857 }
3858
3859 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3860                                              const struct nft_chain *chain,
3861                                              const struct nlattr *nla)
3862 {
3863         struct nftables_pernet *nft_net = nft_pernet(net);
3864         u32 id = ntohl(nla_get_be32(nla));
3865         struct nft_trans *trans;
3866
3867         list_for_each_entry(trans, &nft_net->commit_list, list) {
3868                 struct nft_rule *rule = nft_trans_rule(trans);
3869
3870                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3871                     trans->ctx.chain == chain &&
3872                     id == nft_trans_rule_id(trans))
3873                         return rule;
3874         }
3875         return ERR_PTR(-ENOENT);
3876 }
3877
3878 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3879                              const struct nlattr * const nla[])
3880 {
3881         struct netlink_ext_ack *extack = info->extack;
3882         u8 genmask = nft_genmask_next(info->net);
3883         u8 family = info->nfmsg->nfgen_family;
3884         struct nft_chain *chain = NULL;
3885         struct net *net = info->net;
3886         struct nft_table *table;
3887         struct nft_rule *rule;
3888         struct nft_ctx ctx;
3889         int err = 0;
3890
3891         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3892                                  NETLINK_CB(skb).portid);
3893         if (IS_ERR(table)) {
3894                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3895                 return PTR_ERR(table);
3896         }
3897
3898         if (nla[NFTA_RULE_CHAIN]) {
3899                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3900                                          genmask);
3901                 if (IS_ERR(chain)) {
3902                         if (PTR_ERR(chain) == -ENOENT &&
3903                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3904                                 return 0;
3905
3906                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3907                         return PTR_ERR(chain);
3908                 }
3909                 if (nft_chain_is_bound(chain))
3910                         return -EOPNOTSUPP;
3911         }
3912
3913         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3914
3915         if (chain) {
3916                 if (nla[NFTA_RULE_HANDLE]) {
3917                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3918                         if (IS_ERR(rule)) {
3919                                 if (PTR_ERR(rule) == -ENOENT &&
3920                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3921                                         return 0;
3922
3923                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3924                                 return PTR_ERR(rule);
3925                         }
3926
3927                         err = nft_delrule(&ctx, rule);
3928                 } else if (nla[NFTA_RULE_ID]) {
3929                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3930                         if (IS_ERR(rule)) {
3931                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3932                                 return PTR_ERR(rule);
3933                         }
3934
3935                         err = nft_delrule(&ctx, rule);
3936                 } else {
3937                         err = nft_delrule_by_chain(&ctx);
3938                 }
3939         } else {
3940                 list_for_each_entry(chain, &table->chains, list) {
3941                         if (!nft_is_active_next(net, chain))
3942                                 continue;
3943
3944                         ctx.chain = chain;
3945                         err = nft_delrule_by_chain(&ctx);
3946                         if (err < 0)
3947                                 break;
3948                 }
3949         }
3950
3951         return err;
3952 }
3953
3954 /*
3955  * Sets
3956  */
3957 static const struct nft_set_type *nft_set_types[] = {
3958         &nft_set_hash_fast_type,
3959         &nft_set_hash_type,
3960         &nft_set_rhash_type,
3961         &nft_set_bitmap_type,
3962         &nft_set_rbtree_type,
3963 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3964         &nft_set_pipapo_avx2_type,
3965 #endif
3966         &nft_set_pipapo_type,
3967 };
3968
3969 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3970                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3971                                  NFT_SET_EVAL)
3972
3973 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3974 {
3975         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3976 }
3977
3978 /*
3979  * Select a set implementation based on the data characteristics and the
3980  * given policy. The total memory use might not be known if no size is
3981  * given, in that case the amount of memory per element is used.
3982  */
3983 static const struct nft_set_ops *
3984 nft_select_set_ops(const struct nft_ctx *ctx,
3985                    const struct nlattr * const nla[],
3986                    const struct nft_set_desc *desc)
3987 {
3988         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3989         const struct nft_set_ops *ops, *bops;
3990         struct nft_set_estimate est, best;
3991         const struct nft_set_type *type;
3992         u32 flags = 0;
3993         int i;
3994
3995         lockdep_assert_held(&nft_net->commit_mutex);
3996         lockdep_nfnl_nft_mutex_not_held();
3997
3998         if (nla[NFTA_SET_FLAGS] != NULL)
3999                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4000
4001         bops        = NULL;
4002         best.size   = ~0;
4003         best.lookup = ~0;
4004         best.space  = ~0;
4005
4006         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4007                 type = nft_set_types[i];
4008                 ops = &type->ops;
4009
4010                 if (!nft_set_ops_candidate(type, flags))
4011                         continue;
4012                 if (!ops->estimate(desc, flags, &est))
4013                         continue;
4014
4015                 switch (desc->policy) {
4016                 case NFT_SET_POL_PERFORMANCE:
4017                         if (est.lookup < best.lookup)
4018                                 break;
4019                         if (est.lookup == best.lookup &&
4020                             est.space < best.space)
4021                                 break;
4022                         continue;
4023                 case NFT_SET_POL_MEMORY:
4024                         if (!desc->size) {
4025                                 if (est.space < best.space)
4026                                         break;
4027                                 if (est.space == best.space &&
4028                                     est.lookup < best.lookup)
4029                                         break;
4030                         } else if (est.size < best.size || !bops) {
4031                                 break;
4032                         }
4033                         continue;
4034                 default:
4035                         break;
4036                 }
4037
4038                 bops = ops;
4039                 best = est;
4040         }
4041
4042         if (bops != NULL)
4043                 return bops;
4044
4045         return ERR_PTR(-EOPNOTSUPP);
4046 }
4047
4048 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4049         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4050                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4051         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4052                                             .len = NFT_SET_MAXNAMELEN - 1 },
4053         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4054         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4055         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4056         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4057         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4058         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4059         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4060         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4061         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4062         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4063         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4064                                             .len  = NFT_USERDATA_MAXLEN },
4065         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4066         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4067         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4068         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4069 };
4070
4071 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4072         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4073         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4074 };
4075
4076 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4077                                       const struct nlattr *nla, u8 genmask)
4078 {
4079         struct nft_set *set;
4080
4081         if (nla == NULL)
4082                 return ERR_PTR(-EINVAL);
4083
4084         list_for_each_entry_rcu(set, &table->sets, list) {
4085                 if (!nla_strcmp(nla, set->name) &&
4086                     nft_active_genmask(set, genmask))
4087                         return set;
4088         }
4089         return ERR_PTR(-ENOENT);
4090 }
4091
4092 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4093                                                const struct nlattr *nla,
4094                                                u8 genmask)
4095 {
4096         struct nft_set *set;
4097
4098         list_for_each_entry(set, &table->sets, list) {
4099                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4100                     nft_active_genmask(set, genmask))
4101                         return set;
4102         }
4103         return ERR_PTR(-ENOENT);
4104 }
4105
4106 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4107                                            const struct nft_table *table,
4108                                            const struct nlattr *nla, u8 genmask)
4109 {
4110         struct nftables_pernet *nft_net = nft_pernet(net);
4111         u32 id = ntohl(nla_get_be32(nla));
4112         struct nft_trans *trans;
4113
4114         list_for_each_entry(trans, &nft_net->commit_list, list) {
4115                 if (trans->msg_type == NFT_MSG_NEWSET) {
4116                         struct nft_set *set = nft_trans_set(trans);
4117
4118                         if (id == nft_trans_set_id(trans) &&
4119                             set->table == table &&
4120                             nft_active_genmask(set, genmask))
4121                                 return set;
4122                 }
4123         }
4124         return ERR_PTR(-ENOENT);
4125 }
4126
4127 struct nft_set *nft_set_lookup_global(const struct net *net,
4128                                       const struct nft_table *table,
4129                                       const struct nlattr *nla_set_name,
4130                                       const struct nlattr *nla_set_id,
4131                                       u8 genmask)
4132 {
4133         struct nft_set *set;
4134
4135         set = nft_set_lookup(table, nla_set_name, genmask);
4136         if (IS_ERR(set)) {
4137                 if (!nla_set_id)
4138                         return set;
4139
4140                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4141         }
4142         return set;
4143 }
4144 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4145
4146 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4147                                     const char *name)
4148 {
4149         const struct nft_set *i;
4150         const char *p;
4151         unsigned long *inuse;
4152         unsigned int n = 0, min = 0;
4153
4154         p = strchr(name, '%');
4155         if (p != NULL) {
4156                 if (p[1] != 'd' || strchr(p + 2, '%'))
4157                         return -EINVAL;
4158
4159                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4160                 if (inuse == NULL)
4161                         return -ENOMEM;
4162 cont:
4163                 list_for_each_entry(i, &ctx->table->sets, list) {
4164                         int tmp;
4165
4166                         if (!nft_is_active_next(ctx->net, i))
4167                                 continue;
4168                         if (!sscanf(i->name, name, &tmp))
4169                                 continue;
4170                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4171                                 continue;
4172
4173                         set_bit(tmp - min, inuse);
4174                 }
4175
4176                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4177                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4178                         min += BITS_PER_BYTE * PAGE_SIZE;
4179                         memset(inuse, 0, PAGE_SIZE);
4180                         goto cont;
4181                 }
4182                 free_page((unsigned long)inuse);
4183         }
4184
4185         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4186         if (!set->name)
4187                 return -ENOMEM;
4188
4189         list_for_each_entry(i, &ctx->table->sets, list) {
4190                 if (!nft_is_active_next(ctx->net, i))
4191                         continue;
4192                 if (!strcmp(set->name, i->name)) {
4193                         kfree(set->name);
4194                         set->name = NULL;
4195                         return -ENFILE;
4196                 }
4197         }
4198         return 0;
4199 }
4200
4201 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4202 {
4203         u64 ms = be64_to_cpu(nla_get_be64(nla));
4204         u64 max = (u64)(~((u64)0));
4205
4206         max = div_u64(max, NSEC_PER_MSEC);
4207         if (ms >= max)
4208                 return -ERANGE;
4209
4210         ms *= NSEC_PER_MSEC;
4211         *result = nsecs_to_jiffies64(ms);
4212         return 0;
4213 }
4214
4215 __be64 nf_jiffies64_to_msecs(u64 input)
4216 {
4217         return cpu_to_be64(jiffies64_to_msecs(input));
4218 }
4219
4220 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4221                                      const struct nft_set *set)
4222 {
4223         struct nlattr *concat, *field;
4224         int i;
4225
4226         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4227         if (!concat)
4228                 return -ENOMEM;
4229
4230         for (i = 0; i < set->field_count; i++) {
4231                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4232                 if (!field)
4233                         return -ENOMEM;
4234
4235                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4236                                  htonl(set->field_len[i])))
4237                         return -ENOMEM;
4238
4239                 nla_nest_end(skb, field);
4240         }
4241
4242         nla_nest_end(skb, concat);
4243
4244         return 0;
4245 }
4246
4247 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4248                               const struct nft_set *set, u16 event, u16 flags)
4249 {
4250         u64 timeout = READ_ONCE(set->timeout);
4251         u32 gc_int = READ_ONCE(set->gc_int);
4252         u32 portid = ctx->portid;
4253         struct nlmsghdr *nlh;
4254         struct nlattr *nest;
4255         u32 seq = ctx->seq;
4256         int i;
4257
4258         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4259         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4260                            NFNETLINK_V0, nft_base_seq(ctx->net));
4261         if (!nlh)
4262                 goto nla_put_failure;
4263
4264         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4265                 goto nla_put_failure;
4266         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4267                 goto nla_put_failure;
4268         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4269                          NFTA_SET_PAD))
4270                 goto nla_put_failure;
4271
4272         if (event == NFT_MSG_DELSET) {
4273                 nlmsg_end(skb, nlh);
4274                 return 0;
4275         }
4276
4277         if (set->flags != 0)
4278                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4279                         goto nla_put_failure;
4280
4281         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4282                 goto nla_put_failure;
4283         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4284                 goto nla_put_failure;
4285         if (set->flags & NFT_SET_MAP) {
4286                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4287                         goto nla_put_failure;
4288                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4289                         goto nla_put_failure;
4290         }
4291         if (set->flags & NFT_SET_OBJECT &&
4292             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4293                 goto nla_put_failure;
4294
4295         if (timeout &&
4296             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4297                          nf_jiffies64_to_msecs(timeout),
4298                          NFTA_SET_PAD))
4299                 goto nla_put_failure;
4300         if (gc_int &&
4301             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4302                 goto nla_put_failure;
4303
4304         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4305                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4306                         goto nla_put_failure;
4307         }
4308
4309         if (set->udata &&
4310             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4311                 goto nla_put_failure;
4312
4313         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4314         if (!nest)
4315                 goto nla_put_failure;
4316         if (set->size &&
4317             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4318                 goto nla_put_failure;
4319
4320         if (set->field_count > 1 &&
4321             nf_tables_fill_set_concat(skb, set))
4322                 goto nla_put_failure;
4323
4324         nla_nest_end(skb, nest);
4325
4326         if (set->num_exprs == 1) {
4327                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4328                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4329                         goto nla_put_failure;
4330
4331                 nla_nest_end(skb, nest);
4332         } else if (set->num_exprs > 1) {
4333                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4334                 if (nest == NULL)
4335                         goto nla_put_failure;
4336
4337                 for (i = 0; i < set->num_exprs; i++) {
4338                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4339                                           set->exprs[i], false) < 0)
4340                                 goto nla_put_failure;
4341                 }
4342                 nla_nest_end(skb, nest);
4343         }
4344
4345         nlmsg_end(skb, nlh);
4346         return 0;
4347
4348 nla_put_failure:
4349         nlmsg_trim(skb, nlh);
4350         return -1;
4351 }
4352
4353 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4354                                  const struct nft_set *set, int event,
4355                                  gfp_t gfp_flags)
4356 {
4357         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4358         u32 portid = ctx->portid;
4359         struct sk_buff *skb;
4360         u16 flags = 0;
4361         int err;
4362
4363         if (!ctx->report &&
4364             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4365                 return;
4366
4367         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4368         if (skb == NULL)
4369                 goto err;
4370
4371         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4372                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4373
4374         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4375         if (err < 0) {
4376                 kfree_skb(skb);
4377                 goto err;
4378         }
4379
4380         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4381         return;
4382 err:
4383         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4384 }
4385
4386 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4387 {
4388         const struct nft_set *set;
4389         unsigned int idx, s_idx = cb->args[0];
4390         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4391         struct net *net = sock_net(skb->sk);
4392         struct nft_ctx *ctx = cb->data, ctx_set;
4393         struct nftables_pernet *nft_net;
4394
4395         if (cb->args[1])
4396                 return skb->len;
4397
4398         rcu_read_lock();
4399         nft_net = nft_pernet(net);
4400         cb->seq = READ_ONCE(nft_net->base_seq);
4401
4402         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4403                 if (ctx->family != NFPROTO_UNSPEC &&
4404                     ctx->family != table->family)
4405                         continue;
4406
4407                 if (ctx->table && ctx->table != table)
4408                         continue;
4409
4410                 if (cur_table) {
4411                         if (cur_table != table)
4412                                 continue;
4413
4414                         cur_table = NULL;
4415                 }
4416                 idx = 0;
4417                 list_for_each_entry_rcu(set, &table->sets, list) {
4418                         if (idx < s_idx)
4419                                 goto cont;
4420                         if (!nft_is_active(net, set))
4421                                 goto cont;
4422
4423                         ctx_set = *ctx;
4424                         ctx_set.table = table;
4425                         ctx_set.family = table->family;
4426
4427                         if (nf_tables_fill_set(skb, &ctx_set, set,
4428                                                NFT_MSG_NEWSET,
4429                                                NLM_F_MULTI) < 0) {
4430                                 cb->args[0] = idx;
4431                                 cb->args[2] = (unsigned long) table;
4432                                 goto done;
4433                         }
4434                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4435 cont:
4436                         idx++;
4437                 }
4438                 if (s_idx)
4439                         s_idx = 0;
4440         }
4441         cb->args[1] = 1;
4442 done:
4443         rcu_read_unlock();
4444         return skb->len;
4445 }
4446
4447 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4448 {
4449         struct nft_ctx *ctx_dump = NULL;
4450
4451         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4452         if (ctx_dump == NULL)
4453                 return -ENOMEM;
4454
4455         cb->data = ctx_dump;
4456         return 0;
4457 }
4458
4459 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4460 {
4461         kfree(cb->data);
4462         return 0;
4463 }
4464
4465 /* called with rcu_read_lock held */
4466 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4467                             const struct nlattr * const nla[])
4468 {
4469         struct netlink_ext_ack *extack = info->extack;
4470         u8 genmask = nft_genmask_cur(info->net);
4471         u8 family = info->nfmsg->nfgen_family;
4472         struct nft_table *table = NULL;
4473         struct net *net = info->net;
4474         const struct nft_set *set;
4475         struct sk_buff *skb2;
4476         struct nft_ctx ctx;
4477         int err;
4478
4479         if (nla[NFTA_SET_TABLE]) {
4480                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4481                                          genmask, 0);
4482                 if (IS_ERR(table)) {
4483                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4484                         return PTR_ERR(table);
4485                 }
4486         }
4487
4488         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4489
4490         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4491                 struct netlink_dump_control c = {
4492                         .start = nf_tables_dump_sets_start,
4493                         .dump = nf_tables_dump_sets,
4494                         .done = nf_tables_dump_sets_done,
4495                         .data = &ctx,
4496                         .module = THIS_MODULE,
4497                 };
4498
4499                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4500         }
4501
4502         /* Only accept unspec with dump */
4503         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4504                 return -EAFNOSUPPORT;
4505         if (!nla[NFTA_SET_TABLE])
4506                 return -EINVAL;
4507
4508         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4509         if (IS_ERR(set))
4510                 return PTR_ERR(set);
4511
4512         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4513         if (skb2 == NULL)
4514                 return -ENOMEM;
4515
4516         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4517         if (err < 0)
4518                 goto err_fill_set_info;
4519
4520         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4521
4522 err_fill_set_info:
4523         kfree_skb(skb2);
4524         return err;
4525 }
4526
4527 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4528         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4529 };
4530
4531 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4532                                      struct nft_set_desc *desc)
4533 {
4534         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4535         u32 len;
4536         int err;
4537
4538         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4539                 return -E2BIG;
4540
4541         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4542                                           nft_concat_policy, NULL);
4543         if (err < 0)
4544                 return err;
4545
4546         if (!tb[NFTA_SET_FIELD_LEN])
4547                 return -EINVAL;
4548
4549         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4550         if (!len || len > U8_MAX)
4551                 return -EINVAL;
4552
4553         desc->field_len[desc->field_count++] = len;
4554
4555         return 0;
4556 }
4557
4558 static int nft_set_desc_concat(struct nft_set_desc *desc,
4559                                const struct nlattr *nla)
4560 {
4561         struct nlattr *attr;
4562         u32 num_regs = 0;
4563         int rem, err, i;
4564
4565         nla_for_each_nested(attr, nla, rem) {
4566                 if (nla_type(attr) != NFTA_LIST_ELEM)
4567                         return -EINVAL;
4568
4569                 err = nft_set_desc_concat_parse(attr, desc);
4570                 if (err < 0)
4571                         return err;
4572         }
4573
4574         for (i = 0; i < desc->field_count; i++)
4575                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4576
4577         if (num_regs > NFT_REG32_COUNT)
4578                 return -E2BIG;
4579
4580         return 0;
4581 }
4582
4583 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4584                                     const struct nlattr *nla)
4585 {
4586         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4587         int err;
4588
4589         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4590                                           nft_set_desc_policy, NULL);
4591         if (err < 0)
4592                 return err;
4593
4594         if (da[NFTA_SET_DESC_SIZE] != NULL)
4595                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4596         if (da[NFTA_SET_DESC_CONCAT])
4597                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4598
4599         return err;
4600 }
4601
4602 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4603                               const struct nlattr * const *nla,
4604                               struct nft_expr **exprs, int *num_exprs,
4605                               u32 flags)
4606 {
4607         struct nft_expr *expr;
4608         int err, i;
4609
4610         if (nla[NFTA_SET_EXPR]) {
4611                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4612                 if (IS_ERR(expr)) {
4613                         err = PTR_ERR(expr);
4614                         goto err_set_expr_alloc;
4615                 }
4616                 exprs[0] = expr;
4617                 (*num_exprs)++;
4618         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4619                 struct nlattr *tmp;
4620                 int left;
4621
4622                 if (!(flags & NFT_SET_EXPR)) {
4623                         err = -EINVAL;
4624                         goto err_set_expr_alloc;
4625                 }
4626                 i = 0;
4627                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4628                         if (i == NFT_SET_EXPR_MAX) {
4629                                 err = -E2BIG;
4630                                 goto err_set_expr_alloc;
4631                         }
4632                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4633                                 err = -EINVAL;
4634                                 goto err_set_expr_alloc;
4635                         }
4636                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4637                         if (IS_ERR(expr)) {
4638                                 err = PTR_ERR(expr);
4639                                 goto err_set_expr_alloc;
4640                         }
4641                         exprs[i++] = expr;
4642                         (*num_exprs)++;
4643                 }
4644         }
4645
4646         return 0;
4647
4648 err_set_expr_alloc:
4649         for (i = 0; i < *num_exprs; i++)
4650                 nft_expr_destroy(ctx, exprs[i]);
4651
4652         return err;
4653 }
4654
4655 static bool nft_set_is_same(const struct nft_set *set,
4656                             const struct nft_set_desc *desc,
4657                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4658 {
4659         int i;
4660
4661         if (set->ktype != desc->ktype ||
4662             set->dtype != desc->dtype ||
4663             set->flags != flags ||
4664             set->klen != desc->klen ||
4665             set->dlen != desc->dlen ||
4666             set->field_count != desc->field_count ||
4667             set->num_exprs != num_exprs)
4668                 return false;
4669
4670         for (i = 0; i < desc->field_count; i++) {
4671                 if (set->field_len[i] != desc->field_len[i])
4672                         return false;
4673         }
4674
4675         for (i = 0; i < num_exprs; i++) {
4676                 if (set->exprs[i]->ops != exprs[i]->ops)
4677                         return false;
4678         }
4679
4680         return true;
4681 }
4682
4683 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4684                             const struct nlattr * const nla[])
4685 {
4686         struct netlink_ext_ack *extack = info->extack;
4687         u8 genmask = nft_genmask_next(info->net);
4688         u8 family = info->nfmsg->nfgen_family;
4689         const struct nft_set_ops *ops;
4690         struct net *net = info->net;
4691         struct nft_set_desc desc;
4692         struct nft_table *table;
4693         unsigned char *udata;
4694         struct nft_set *set;
4695         struct nft_ctx ctx;
4696         size_t alloc_size;
4697         int num_exprs = 0;
4698         char *name;
4699         int err, i;
4700         u16 udlen;
4701         u32 flags;
4702         u64 size;
4703
4704         if (nla[NFTA_SET_TABLE] == NULL ||
4705             nla[NFTA_SET_NAME] == NULL ||
4706             nla[NFTA_SET_KEY_LEN] == NULL ||
4707             nla[NFTA_SET_ID] == NULL)
4708                 return -EINVAL;
4709
4710         memset(&desc, 0, sizeof(desc));
4711
4712         desc.ktype = NFT_DATA_VALUE;
4713         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4714                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4715                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4716                         return -EINVAL;
4717         }
4718
4719         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4720         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4721                 return -EINVAL;
4722
4723         flags = 0;
4724         if (nla[NFTA_SET_FLAGS] != NULL) {
4725                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4726                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4727                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4728                               NFT_SET_MAP | NFT_SET_EVAL |
4729                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4730                         return -EOPNOTSUPP;
4731                 /* Only one of these operations is supported */
4732                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4733                              (NFT_SET_MAP | NFT_SET_OBJECT))
4734                         return -EOPNOTSUPP;
4735                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4736                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4737                         return -EOPNOTSUPP;
4738         }
4739
4740         desc.dtype = 0;
4741         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4742                 if (!(flags & NFT_SET_MAP))
4743                         return -EINVAL;
4744
4745                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4746                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4747                     desc.dtype != NFT_DATA_VERDICT)
4748                         return -EINVAL;
4749
4750                 if (desc.dtype != NFT_DATA_VERDICT) {
4751                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4752                                 return -EINVAL;
4753                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4754                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4755                                 return -EINVAL;
4756                 } else
4757                         desc.dlen = sizeof(struct nft_verdict);
4758         } else if (flags & NFT_SET_MAP)
4759                 return -EINVAL;
4760
4761         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4762                 if (!(flags & NFT_SET_OBJECT))
4763                         return -EINVAL;
4764
4765                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4766                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4767                     desc.objtype > NFT_OBJECT_MAX)
4768                         return -EOPNOTSUPP;
4769         } else if (flags & NFT_SET_OBJECT)
4770                 return -EINVAL;
4771         else
4772                 desc.objtype = NFT_OBJECT_UNSPEC;
4773
4774         desc.timeout = 0;
4775         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4776                 if (!(flags & NFT_SET_TIMEOUT))
4777                         return -EINVAL;
4778
4779                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4780                 if (err)
4781                         return err;
4782         }
4783         desc.gc_int = 0;
4784         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4785                 if (!(flags & NFT_SET_TIMEOUT))
4786                         return -EINVAL;
4787                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4788         }
4789
4790         desc.policy = NFT_SET_POL_PERFORMANCE;
4791         if (nla[NFTA_SET_POLICY] != NULL)
4792                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4793
4794         if (nla[NFTA_SET_DESC] != NULL) {
4795                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4796                 if (err < 0)
4797                         return err;
4798
4799                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4800                         return -EINVAL;
4801         } else if (flags & NFT_SET_CONCAT) {
4802                 return -EINVAL;
4803         }
4804
4805         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4806                 desc.expr = true;
4807
4808         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4809                                  NETLINK_CB(skb).portid);
4810         if (IS_ERR(table)) {
4811                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4812                 return PTR_ERR(table);
4813         }
4814
4815         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4816
4817         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4818         if (IS_ERR(set)) {
4819                 if (PTR_ERR(set) != -ENOENT) {
4820                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4821                         return PTR_ERR(set);
4822                 }
4823         } else {
4824                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4825
4826                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4827                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4828                         return -EEXIST;
4829                 }
4830                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4831                         return -EOPNOTSUPP;
4832
4833                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4834                 if (err < 0)
4835                         return err;
4836
4837                 err = 0;
4838                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4839                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4840                         err = -EEXIST;
4841                 }
4842
4843                 for (i = 0; i < num_exprs; i++)
4844                         nft_expr_destroy(&ctx, exprs[i]);
4845
4846                 if (err < 0)
4847                         return err;
4848
4849                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4850         }
4851
4852         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4853                 return -ENOENT;
4854
4855         ops = nft_select_set_ops(&ctx, nla, &desc);
4856         if (IS_ERR(ops))
4857                 return PTR_ERR(ops);
4858
4859         udlen = 0;
4860         if (nla[NFTA_SET_USERDATA])
4861                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4862
4863         size = 0;
4864         if (ops->privsize != NULL)
4865                 size = ops->privsize(nla, &desc);
4866         alloc_size = sizeof(*set) + size + udlen;
4867         if (alloc_size < size || alloc_size > INT_MAX)
4868                 return -ENOMEM;
4869         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4870         if (!set)
4871                 return -ENOMEM;
4872
4873         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4874         if (!name) {
4875                 err = -ENOMEM;
4876                 goto err_set_name;
4877         }
4878
4879         err = nf_tables_set_alloc_name(&ctx, set, name);
4880         kfree(name);
4881         if (err < 0)
4882                 goto err_set_name;
4883
4884         udata = NULL;
4885         if (udlen) {
4886                 udata = set->data + size;
4887                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4888         }
4889
4890         INIT_LIST_HEAD(&set->bindings);
4891         INIT_LIST_HEAD(&set->catchall_list);
4892         set->table = table;
4893         write_pnet(&set->net, net);
4894         set->ops = ops;
4895         set->ktype = desc.ktype;
4896         set->klen = desc.klen;
4897         set->dtype = desc.dtype;
4898         set->objtype = desc.objtype;
4899         set->dlen = desc.dlen;
4900         set->flags = flags;
4901         set->size = desc.size;
4902         set->policy = desc.policy;
4903         set->udlen = udlen;
4904         set->udata = udata;
4905         set->timeout = desc.timeout;
4906         set->gc_int = desc.gc_int;
4907
4908         set->field_count = desc.field_count;
4909         for (i = 0; i < desc.field_count; i++)
4910                 set->field_len[i] = desc.field_len[i];
4911
4912         err = ops->init(set, &desc, nla);
4913         if (err < 0)
4914                 goto err_set_init;
4915
4916         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4917         if (err < 0)
4918                 goto err_set_destroy;
4919
4920         set->num_exprs = num_exprs;
4921         set->handle = nf_tables_alloc_handle(table);
4922
4923         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4924         if (err < 0)
4925                 goto err_set_expr_alloc;
4926
4927         list_add_tail_rcu(&set->list, &table->sets);
4928         table->use++;
4929         return 0;
4930
4931 err_set_expr_alloc:
4932         for (i = 0; i < set->num_exprs; i++)
4933                 nft_expr_destroy(&ctx, set->exprs[i]);
4934 err_set_destroy:
4935         ops->destroy(set);
4936 err_set_init:
4937         kfree(set->name);
4938 err_set_name:
4939         kvfree(set);
4940         return err;
4941 }
4942
4943 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4944                                      struct nft_set *set)
4945 {
4946         struct nft_set_elem_catchall *next, *catchall;
4947
4948         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4949                 list_del_rcu(&catchall->list);
4950                 nft_set_elem_destroy(set, catchall->elem, true);
4951                 kfree_rcu(catchall, rcu);
4952         }
4953 }
4954
4955 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4956 {
4957         int i;
4958
4959         if (WARN_ON(set->use > 0))
4960                 return;
4961
4962         for (i = 0; i < set->num_exprs; i++)
4963                 nft_expr_destroy(ctx, set->exprs[i]);
4964
4965         set->ops->destroy(set);
4966         nft_set_catchall_destroy(ctx, set);
4967         kfree(set->name);
4968         kvfree(set);
4969 }
4970
4971 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4972                             const struct nlattr * const nla[])
4973 {
4974         struct netlink_ext_ack *extack = info->extack;
4975         u8 genmask = nft_genmask_next(info->net);
4976         u8 family = info->nfmsg->nfgen_family;
4977         struct net *net = info->net;
4978         const struct nlattr *attr;
4979         struct nft_table *table;
4980         struct nft_set *set;
4981         struct nft_ctx ctx;
4982
4983         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4984                 return -EAFNOSUPPORT;
4985
4986         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4987                                  genmask, NETLINK_CB(skb).portid);
4988         if (IS_ERR(table)) {
4989                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4990                 return PTR_ERR(table);
4991         }
4992
4993         if (nla[NFTA_SET_HANDLE]) {
4994                 attr = nla[NFTA_SET_HANDLE];
4995                 set = nft_set_lookup_byhandle(table, attr, genmask);
4996         } else {
4997                 attr = nla[NFTA_SET_NAME];
4998                 set = nft_set_lookup(table, attr, genmask);
4999         }
5000
5001         if (IS_ERR(set)) {
5002                 if (PTR_ERR(set) == -ENOENT &&
5003                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5004                         return 0;
5005
5006                 NL_SET_BAD_ATTR(extack, attr);
5007                 return PTR_ERR(set);
5008         }
5009         if (set->use ||
5010             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5011              atomic_read(&set->nelems) > 0)) {
5012                 NL_SET_BAD_ATTR(extack, attr);
5013                 return -EBUSY;
5014         }
5015
5016         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5017
5018         return nft_delset(&ctx, set);
5019 }
5020
5021 static int nft_validate_register_store(const struct nft_ctx *ctx,
5022                                        enum nft_registers reg,
5023                                        const struct nft_data *data,
5024                                        enum nft_data_types type,
5025                                        unsigned int len);
5026
5027 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5028                                      struct nft_set *set,
5029                                      struct nft_set_elem *elem)
5030 {
5031         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5032         enum nft_registers dreg;
5033
5034         dreg = nft_type_to_reg(set->dtype);
5035         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5036                                            set->dtype == NFT_DATA_VERDICT ?
5037                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5038                                            set->dlen);
5039 }
5040
5041 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5042                                         struct nft_set *set,
5043                                         const struct nft_set_iter *iter,
5044                                         struct nft_set_elem *elem)
5045 {
5046         return nft_setelem_data_validate(ctx, set, elem);
5047 }
5048
5049 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5050                                        struct nft_set *set)
5051 {
5052         u8 genmask = nft_genmask_next(ctx->net);
5053         struct nft_set_elem_catchall *catchall;
5054         struct nft_set_elem elem;
5055         struct nft_set_ext *ext;
5056         int ret = 0;
5057
5058         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5059                 ext = nft_set_elem_ext(set, catchall->elem);
5060                 if (!nft_set_elem_active(ext, genmask))
5061                         continue;
5062
5063                 elem.priv = catchall->elem;
5064                 ret = nft_setelem_data_validate(ctx, set, &elem);
5065                 if (ret < 0)
5066                         break;
5067         }
5068
5069         return ret;
5070 }
5071
5072 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5073                        struct nft_set_binding *binding)
5074 {
5075         struct nft_set_binding *i;
5076         struct nft_set_iter iter;
5077
5078         if (set->use == UINT_MAX)
5079                 return -EOVERFLOW;
5080
5081         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5082                 return -EBUSY;
5083
5084         if (binding->flags & NFT_SET_MAP) {
5085                 /* If the set is already bound to the same chain all
5086                  * jumps are already validated for that chain.
5087                  */
5088                 list_for_each_entry(i, &set->bindings, list) {
5089                         if (i->flags & NFT_SET_MAP &&
5090                             i->chain == binding->chain)
5091                                 goto bind;
5092                 }
5093
5094                 iter.genmask    = nft_genmask_next(ctx->net);
5095                 iter.skip       = 0;
5096                 iter.count      = 0;
5097                 iter.err        = 0;
5098                 iter.fn         = nf_tables_bind_check_setelem;
5099
5100                 set->ops->walk(ctx, set, &iter);
5101                 if (!iter.err)
5102                         iter.err = nft_set_catchall_bind_check(ctx, set);
5103
5104                 if (iter.err < 0)
5105                         return iter.err;
5106         }
5107 bind:
5108         binding->chain = ctx->chain;
5109         list_add_tail_rcu(&binding->list, &set->bindings);
5110         nft_set_trans_bind(ctx, set);
5111         set->use++;
5112
5113         return 0;
5114 }
5115 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5116
5117 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5118                                  struct nft_set_binding *binding, bool event)
5119 {
5120         list_del_rcu(&binding->list);
5121
5122         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5123                 list_del_rcu(&set->list);
5124                 if (event)
5125                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5126                                              GFP_KERNEL);
5127         }
5128 }
5129
5130 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5131 {
5132         if (nft_set_is_anonymous(set))
5133                 nft_clear(ctx->net, set);
5134
5135         set->use++;
5136 }
5137 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5138
5139 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5140                               struct nft_set_binding *binding,
5141                               enum nft_trans_phase phase)
5142 {
5143         switch (phase) {
5144         case NFT_TRANS_PREPARE:
5145                 if (nft_set_is_anonymous(set))
5146                         nft_deactivate_next(ctx->net, set);
5147
5148                 set->use--;
5149                 return;
5150         case NFT_TRANS_ABORT:
5151         case NFT_TRANS_RELEASE:
5152                 set->use--;
5153                 fallthrough;
5154         default:
5155                 nf_tables_unbind_set(ctx, set, binding,
5156                                      phase == NFT_TRANS_COMMIT);
5157         }
5158 }
5159 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5160
5161 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5162 {
5163         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5164                 nft_set_destroy(ctx, set);
5165 }
5166 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5167
5168 const struct nft_set_ext_type nft_set_ext_types[] = {
5169         [NFT_SET_EXT_KEY]               = {
5170                 .align  = __alignof__(u32),
5171         },
5172         [NFT_SET_EXT_DATA]              = {
5173                 .align  = __alignof__(u32),
5174         },
5175         [NFT_SET_EXT_EXPRESSIONS]       = {
5176                 .align  = __alignof__(struct nft_set_elem_expr),
5177         },
5178         [NFT_SET_EXT_OBJREF]            = {
5179                 .len    = sizeof(struct nft_object *),
5180                 .align  = __alignof__(struct nft_object *),
5181         },
5182         [NFT_SET_EXT_FLAGS]             = {
5183                 .len    = sizeof(u8),
5184                 .align  = __alignof__(u8),
5185         },
5186         [NFT_SET_EXT_TIMEOUT]           = {
5187                 .len    = sizeof(u64),
5188                 .align  = __alignof__(u64),
5189         },
5190         [NFT_SET_EXT_EXPIRATION]        = {
5191                 .len    = sizeof(u64),
5192                 .align  = __alignof__(u64),
5193         },
5194         [NFT_SET_EXT_USERDATA]          = {
5195                 .len    = sizeof(struct nft_userdata),
5196                 .align  = __alignof__(struct nft_userdata),
5197         },
5198         [NFT_SET_EXT_KEY_END]           = {
5199                 .align  = __alignof__(u32),
5200         },
5201 };
5202
5203 /*
5204  * Set elements
5205  */
5206
5207 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5208         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5209         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5210         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5211         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5212         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5213         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5214                                             .len = NFT_USERDATA_MAXLEN },
5215         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5216         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5217                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5218         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5219         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5220 };
5221
5222 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5223         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5224                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5225         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5226                                             .len = NFT_SET_MAXNAMELEN - 1 },
5227         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5228         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5229 };
5230
5231 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5232                                   const struct nft_set *set,
5233                                   const struct nft_set_ext *ext)
5234 {
5235         struct nft_set_elem_expr *elem_expr;
5236         u32 size, num_exprs = 0;
5237         struct nft_expr *expr;
5238         struct nlattr *nest;
5239
5240         elem_expr = nft_set_ext_expr(ext);
5241         nft_setelem_expr_foreach(expr, elem_expr, size)
5242                 num_exprs++;
5243
5244         if (num_exprs == 1) {
5245                 expr = nft_setelem_expr_at(elem_expr, 0);
5246                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5247                         return -1;
5248
5249                 return 0;
5250         } else if (num_exprs > 1) {
5251                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5252                 if (nest == NULL)
5253                         goto nla_put_failure;
5254
5255                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5256                         expr = nft_setelem_expr_at(elem_expr, size);
5257                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5258                                 goto nla_put_failure;
5259                 }
5260                 nla_nest_end(skb, nest);
5261         }
5262         return 0;
5263
5264 nla_put_failure:
5265         return -1;
5266 }
5267
5268 static int nf_tables_fill_setelem(struct sk_buff *skb,
5269                                   const struct nft_set *set,
5270                                   const struct nft_set_elem *elem)
5271 {
5272         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5273         unsigned char *b = skb_tail_pointer(skb);
5274         struct nlattr *nest;
5275
5276         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5277         if (nest == NULL)
5278                 goto nla_put_failure;
5279
5280         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5281             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5282                           NFT_DATA_VALUE, set->klen) < 0)
5283                 goto nla_put_failure;
5284
5285         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5286             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5287                           NFT_DATA_VALUE, set->klen) < 0)
5288                 goto nla_put_failure;
5289
5290         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5291             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5292                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5293                           set->dlen) < 0)
5294                 goto nla_put_failure;
5295
5296         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5297             nft_set_elem_expr_dump(skb, set, ext))
5298                 goto nla_put_failure;
5299
5300         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5301             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5302                            (*nft_set_ext_obj(ext))->key.name) < 0)
5303                 goto nla_put_failure;
5304
5305         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5306             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5307                          htonl(*nft_set_ext_flags(ext))))
5308                 goto nla_put_failure;
5309
5310         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5311             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5312                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5313                          NFTA_SET_ELEM_PAD))
5314                 goto nla_put_failure;
5315
5316         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5317                 u64 expires, now = get_jiffies_64();
5318
5319                 expires = *nft_set_ext_expiration(ext);
5320                 if (time_before64(now, expires))
5321                         expires -= now;
5322                 else
5323                         expires = 0;
5324
5325                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5326                                  nf_jiffies64_to_msecs(expires),
5327                                  NFTA_SET_ELEM_PAD))
5328                         goto nla_put_failure;
5329         }
5330
5331         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5332                 struct nft_userdata *udata;
5333
5334                 udata = nft_set_ext_userdata(ext);
5335                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5336                             udata->len + 1, udata->data))
5337                         goto nla_put_failure;
5338         }
5339
5340         nla_nest_end(skb, nest);
5341         return 0;
5342
5343 nla_put_failure:
5344         nlmsg_trim(skb, b);
5345         return -EMSGSIZE;
5346 }
5347
5348 struct nft_set_dump_args {
5349         const struct netlink_callback   *cb;
5350         struct nft_set_iter             iter;
5351         struct sk_buff                  *skb;
5352 };
5353
5354 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5355                                   struct nft_set *set,
5356                                   const struct nft_set_iter *iter,
5357                                   struct nft_set_elem *elem)
5358 {
5359         struct nft_set_dump_args *args;
5360
5361         args = container_of(iter, struct nft_set_dump_args, iter);
5362         return nf_tables_fill_setelem(args->skb, set, elem);
5363 }
5364
5365 struct nft_set_dump_ctx {
5366         const struct nft_set    *set;
5367         struct nft_ctx          ctx;
5368 };
5369
5370 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5371                                  const struct nft_set *set)
5372 {
5373         struct nft_set_elem_catchall *catchall;
5374         u8 genmask = nft_genmask_cur(net);
5375         struct nft_set_elem elem;
5376         struct nft_set_ext *ext;
5377         int ret = 0;
5378
5379         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5380                 ext = nft_set_elem_ext(set, catchall->elem);
5381                 if (!nft_set_elem_active(ext, genmask) ||
5382                     nft_set_elem_expired(ext))
5383                         continue;
5384
5385                 elem.priv = catchall->elem;
5386                 ret = nf_tables_fill_setelem(skb, set, &elem);
5387                 break;
5388         }
5389
5390         return ret;
5391 }
5392
5393 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5394 {
5395         struct nft_set_dump_ctx *dump_ctx = cb->data;
5396         struct net *net = sock_net(skb->sk);
5397         struct nftables_pernet *nft_net;
5398         struct nft_table *table;
5399         struct nft_set *set;
5400         struct nft_set_dump_args args;
5401         bool set_found = false;
5402         struct nlmsghdr *nlh;
5403         struct nlattr *nest;
5404         u32 portid, seq;
5405         int event;
5406
5407         rcu_read_lock();
5408         nft_net = nft_pernet(net);
5409         cb->seq = READ_ONCE(nft_net->base_seq);
5410
5411         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5412                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5413                     dump_ctx->ctx.family != table->family)
5414                         continue;
5415
5416                 if (table != dump_ctx->ctx.table)
5417                         continue;
5418
5419                 list_for_each_entry_rcu(set, &table->sets, list) {
5420                         if (set == dump_ctx->set) {
5421                                 set_found = true;
5422                                 break;
5423                         }
5424                 }
5425                 break;
5426         }
5427
5428         if (!set_found) {
5429                 rcu_read_unlock();
5430                 return -ENOENT;
5431         }
5432
5433         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5434         portid = NETLINK_CB(cb->skb).portid;
5435         seq    = cb->nlh->nlmsg_seq;
5436
5437         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5438                            table->family, NFNETLINK_V0, nft_base_seq(net));
5439         if (!nlh)
5440                 goto nla_put_failure;
5441
5442         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5443                 goto nla_put_failure;
5444         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5445                 goto nla_put_failure;
5446
5447         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5448         if (nest == NULL)
5449                 goto nla_put_failure;
5450
5451         args.cb                 = cb;
5452         args.skb                = skb;
5453         args.iter.genmask       = nft_genmask_cur(net);
5454         args.iter.skip          = cb->args[0];
5455         args.iter.count         = 0;
5456         args.iter.err           = 0;
5457         args.iter.fn            = nf_tables_dump_setelem;
5458         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5459
5460         if (!args.iter.err && args.iter.count == cb->args[0])
5461                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5462         rcu_read_unlock();
5463
5464         nla_nest_end(skb, nest);
5465         nlmsg_end(skb, nlh);
5466
5467         if (args.iter.err && args.iter.err != -EMSGSIZE)
5468                 return args.iter.err;
5469         if (args.iter.count == cb->args[0])
5470                 return 0;
5471
5472         cb->args[0] = args.iter.count;
5473         return skb->len;
5474
5475 nla_put_failure:
5476         rcu_read_unlock();
5477         return -ENOSPC;
5478 }
5479
5480 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5481 {
5482         struct nft_set_dump_ctx *dump_ctx = cb->data;
5483
5484         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5485
5486         return cb->data ? 0 : -ENOMEM;
5487 }
5488
5489 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5490 {
5491         kfree(cb->data);
5492         return 0;
5493 }
5494
5495 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5496                                        const struct nft_ctx *ctx, u32 seq,
5497                                        u32 portid, int event, u16 flags,
5498                                        const struct nft_set *set,
5499                                        const struct nft_set_elem *elem)
5500 {
5501         struct nlmsghdr *nlh;
5502         struct nlattr *nest;
5503         int err;
5504
5505         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5506         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5507                            NFNETLINK_V0, nft_base_seq(ctx->net));
5508         if (!nlh)
5509                 goto nla_put_failure;
5510
5511         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5512                 goto nla_put_failure;
5513         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5514                 goto nla_put_failure;
5515
5516         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5517         if (nest == NULL)
5518                 goto nla_put_failure;
5519
5520         err = nf_tables_fill_setelem(skb, set, elem);
5521         if (err < 0)
5522                 goto nla_put_failure;
5523
5524         nla_nest_end(skb, nest);
5525
5526         nlmsg_end(skb, nlh);
5527         return 0;
5528
5529 nla_put_failure:
5530         nlmsg_trim(skb, nlh);
5531         return -1;
5532 }
5533
5534 static int nft_setelem_parse_flags(const struct nft_set *set,
5535                                    const struct nlattr *attr, u32 *flags)
5536 {
5537         if (attr == NULL)
5538                 return 0;
5539
5540         *flags = ntohl(nla_get_be32(attr));
5541         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5542                 return -EOPNOTSUPP;
5543         if (!(set->flags & NFT_SET_INTERVAL) &&
5544             *flags & NFT_SET_ELEM_INTERVAL_END)
5545                 return -EINVAL;
5546         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5547             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5548                 return -EINVAL;
5549
5550         return 0;
5551 }
5552
5553 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5554                                  struct nft_data *key, struct nlattr *attr)
5555 {
5556         struct nft_data_desc desc = {
5557                 .type   = NFT_DATA_VALUE,
5558                 .size   = NFT_DATA_VALUE_MAXLEN,
5559                 .len    = set->klen,
5560         };
5561
5562         return nft_data_init(ctx, key, &desc, attr);
5563 }
5564
5565 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5566                                   struct nft_data_desc *desc,
5567                                   struct nft_data *data,
5568                                   struct nlattr *attr)
5569 {
5570         u32 dtype;
5571
5572         if (set->dtype == NFT_DATA_VERDICT)
5573                 dtype = NFT_DATA_VERDICT;
5574         else
5575                 dtype = NFT_DATA_VALUE;
5576
5577         desc->type = dtype;
5578         desc->size = NFT_DATA_VALUE_MAXLEN;
5579         desc->len = set->dlen;
5580         desc->flags = NFT_DATA_DESC_SETELEM;
5581
5582         return nft_data_init(ctx, data, desc, attr);
5583 }
5584
5585 static void *nft_setelem_catchall_get(const struct net *net,
5586                                       const struct nft_set *set)
5587 {
5588         struct nft_set_elem_catchall *catchall;
5589         u8 genmask = nft_genmask_cur(net);
5590         struct nft_set_ext *ext;
5591         void *priv = NULL;
5592
5593         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5594                 ext = nft_set_elem_ext(set, catchall->elem);
5595                 if (!nft_set_elem_active(ext, genmask) ||
5596                     nft_set_elem_expired(ext))
5597                         continue;
5598
5599                 priv = catchall->elem;
5600                 break;
5601         }
5602
5603         return priv;
5604 }
5605
5606 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5607                            struct nft_set_elem *elem, u32 flags)
5608 {
5609         void *priv;
5610
5611         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5612                 priv = set->ops->get(ctx->net, set, elem, flags);
5613                 if (IS_ERR(priv))
5614                         return PTR_ERR(priv);
5615         } else {
5616                 priv = nft_setelem_catchall_get(ctx->net, set);
5617                 if (!priv)
5618                         return -ENOENT;
5619         }
5620         elem->priv = priv;
5621
5622         return 0;
5623 }
5624
5625 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5626                             const struct nlattr *attr)
5627 {
5628         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5629         struct nft_set_elem elem;
5630         struct sk_buff *skb;
5631         uint32_t flags = 0;
5632         int err;
5633
5634         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5635                                           nft_set_elem_policy, NULL);
5636         if (err < 0)
5637                 return err;
5638
5639         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5640         if (err < 0)
5641                 return err;
5642
5643         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5644                 return -EINVAL;
5645
5646         if (nla[NFTA_SET_ELEM_KEY]) {
5647                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5648                                             nla[NFTA_SET_ELEM_KEY]);
5649                 if (err < 0)
5650                         return err;
5651         }
5652
5653         if (nla[NFTA_SET_ELEM_KEY_END]) {
5654                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5655                                             nla[NFTA_SET_ELEM_KEY_END]);
5656                 if (err < 0)
5657                         return err;
5658         }
5659
5660         err = nft_setelem_get(ctx, set, &elem, flags);
5661         if (err < 0)
5662                 return err;
5663
5664         err = -ENOMEM;
5665         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5666         if (skb == NULL)
5667                 return err;
5668
5669         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5670                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5671         if (err < 0)
5672                 goto err_fill_setelem;
5673
5674         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5675
5676 err_fill_setelem:
5677         kfree_skb(skb);
5678         return err;
5679 }
5680
5681 /* called with rcu_read_lock held */
5682 static int nf_tables_getsetelem(struct sk_buff *skb,
5683                                 const struct nfnl_info *info,
5684                                 const struct nlattr * const nla[])
5685 {
5686         struct netlink_ext_ack *extack = info->extack;
5687         u8 genmask = nft_genmask_cur(info->net);
5688         u8 family = info->nfmsg->nfgen_family;
5689         struct net *net = info->net;
5690         struct nft_table *table;
5691         struct nft_set *set;
5692         struct nlattr *attr;
5693         struct nft_ctx ctx;
5694         int rem, err = 0;
5695
5696         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5697                                  genmask, 0);
5698         if (IS_ERR(table)) {
5699                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5700                 return PTR_ERR(table);
5701         }
5702
5703         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5704         if (IS_ERR(set))
5705                 return PTR_ERR(set);
5706
5707         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5708
5709         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5710                 struct netlink_dump_control c = {
5711                         .start = nf_tables_dump_set_start,
5712                         .dump = nf_tables_dump_set,
5713                         .done = nf_tables_dump_set_done,
5714                         .module = THIS_MODULE,
5715                 };
5716                 struct nft_set_dump_ctx dump_ctx = {
5717                         .set = set,
5718                         .ctx = ctx,
5719                 };
5720
5721                 c.data = &dump_ctx;
5722                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5723         }
5724
5725         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5726                 return -EINVAL;
5727
5728         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5729                 err = nft_get_set_elem(&ctx, set, attr);
5730                 if (err < 0) {
5731                         NL_SET_BAD_ATTR(extack, attr);
5732                         break;
5733                 }
5734         }
5735
5736         return err;
5737 }
5738
5739 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5740                                      const struct nft_set *set,
5741                                      const struct nft_set_elem *elem,
5742                                      int event)
5743 {
5744         struct nftables_pernet *nft_net;
5745         struct net *net = ctx->net;
5746         u32 portid = ctx->portid;
5747         struct sk_buff *skb;
5748         u16 flags = 0;
5749         int err;
5750
5751         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5752                 return;
5753
5754         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5755         if (skb == NULL)
5756                 goto err;
5757
5758         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5759                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5760
5761         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5762                                           set, elem);
5763         if (err < 0) {
5764                 kfree_skb(skb);
5765                 goto err;
5766         }
5767
5768         nft_net = nft_pernet(net);
5769         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5770         return;
5771 err:
5772         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5773 }
5774
5775 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5776                                               int msg_type,
5777                                               struct nft_set *set)
5778 {
5779         struct nft_trans *trans;
5780
5781         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5782         if (trans == NULL)
5783                 return NULL;
5784
5785         nft_trans_elem_set(trans) = set;
5786         return trans;
5787 }
5788
5789 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5790                                          const struct nft_set *set,
5791                                          const struct nlattr *attr)
5792 {
5793         struct nft_expr *expr;
5794         int err;
5795
5796         expr = nft_expr_init(ctx, attr);
5797         if (IS_ERR(expr))
5798                 return expr;
5799
5800         err = -EOPNOTSUPP;
5801         if (expr->ops->type->flags & NFT_EXPR_GC) {
5802                 if (set->flags & NFT_SET_TIMEOUT)
5803                         goto err_set_elem_expr;
5804                 if (!set->ops->gc_init)
5805                         goto err_set_elem_expr;
5806                 set->ops->gc_init(set);
5807         }
5808
5809         return expr;
5810
5811 err_set_elem_expr:
5812         nft_expr_destroy(ctx, expr);
5813         return ERR_PTR(err);
5814 }
5815
5816 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5817 {
5818         len += nft_set_ext_types[id].len;
5819         if (len > tmpl->ext_len[id] ||
5820             len > U8_MAX)
5821                 return -1;
5822
5823         return 0;
5824 }
5825
5826 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5827                               void *to, const void *from, u32 len)
5828 {
5829         if (nft_set_ext_check(tmpl, id, len) < 0)
5830                 return -1;
5831
5832         memcpy(to, from, len);
5833
5834         return 0;
5835 }
5836
5837 void *nft_set_elem_init(const struct nft_set *set,
5838                         const struct nft_set_ext_tmpl *tmpl,
5839                         const u32 *key, const u32 *key_end,
5840                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5841 {
5842         struct nft_set_ext *ext;
5843         void *elem;
5844
5845         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5846         if (elem == NULL)
5847                 return ERR_PTR(-ENOMEM);
5848
5849         ext = nft_set_elem_ext(set, elem);
5850         nft_set_ext_init(ext, tmpl);
5851
5852         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5853             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5854                                nft_set_ext_key(ext), key, set->klen) < 0)
5855                 goto err_ext_check;
5856
5857         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5858             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5859                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5860                 goto err_ext_check;
5861
5862         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5863             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5864                                nft_set_ext_data(ext), data, set->dlen) < 0)
5865                 goto err_ext_check;
5866
5867         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5868                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5869                 if (expiration == 0)
5870                         *nft_set_ext_expiration(ext) += timeout;
5871         }
5872         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5873                 *nft_set_ext_timeout(ext) = timeout;
5874
5875         return elem;
5876
5877 err_ext_check:
5878         kfree(elem);
5879
5880         return ERR_PTR(-EINVAL);
5881 }
5882
5883 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5884                                         struct nft_expr *expr)
5885 {
5886         if (expr->ops->destroy_clone) {
5887                 expr->ops->destroy_clone(ctx, expr);
5888                 module_put(expr->ops->type->owner);
5889         } else {
5890                 nf_tables_expr_destroy(ctx, expr);
5891         }
5892 }
5893
5894 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5895                                       struct nft_set_elem_expr *elem_expr)
5896 {
5897         struct nft_expr *expr;
5898         u32 size;
5899
5900         nft_setelem_expr_foreach(expr, elem_expr, size)
5901                 __nft_set_elem_expr_destroy(ctx, expr);
5902 }
5903
5904 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5905                           bool destroy_expr)
5906 {
5907         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5908         struct nft_ctx ctx = {
5909                 .net    = read_pnet(&set->net),
5910                 .family = set->table->family,
5911         };
5912
5913         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5914         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5915                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5916         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5917                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5918
5919         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5920                 (*nft_set_ext_obj(ext))->use--;
5921         kfree(elem);
5922 }
5923 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5924
5925 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5926  * with the refcounting from the preparation phase.
5927  */
5928 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5929                                        const struct nft_set *set, void *elem)
5930 {
5931         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5932
5933         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5934                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5935
5936         kfree(elem);
5937 }
5938
5939 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5940                             struct nft_expr *expr_array[])
5941 {
5942         struct nft_expr *expr;
5943         int err, i, k;
5944
5945         for (i = 0; i < set->num_exprs; i++) {
5946                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5947                 if (!expr)
5948                         goto err_expr;
5949
5950                 err = nft_expr_clone(expr, set->exprs[i]);
5951                 if (err < 0) {
5952                         kfree(expr);
5953                         goto err_expr;
5954                 }
5955                 expr_array[i] = expr;
5956         }
5957
5958         return 0;
5959
5960 err_expr:
5961         for (k = i - 1; k >= 0; k--)
5962                 nft_expr_destroy(ctx, expr_array[k]);
5963
5964         return -ENOMEM;
5965 }
5966
5967 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5968                                    const struct nft_set_ext_tmpl *tmpl,
5969                                    const struct nft_set_ext *ext,
5970                                    struct nft_expr *expr_array[],
5971                                    u32 num_exprs)
5972 {
5973         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5974         u32 len = sizeof(struct nft_set_elem_expr);
5975         struct nft_expr *expr;
5976         int i, err;
5977
5978         if (num_exprs == 0)
5979                 return 0;
5980
5981         for (i = 0; i < num_exprs; i++)
5982                 len += expr_array[i]->ops->size;
5983
5984         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5985                 return -EINVAL;
5986
5987         for (i = 0; i < num_exprs; i++) {
5988                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5989                 err = nft_expr_clone(expr, expr_array[i]);
5990                 if (err < 0)
5991                         goto err_elem_expr_setup;
5992
5993                 elem_expr->size += expr_array[i]->ops->size;
5994                 nft_expr_destroy(ctx, expr_array[i]);
5995                 expr_array[i] = NULL;
5996         }
5997
5998         return 0;
5999
6000 err_elem_expr_setup:
6001         for (; i < num_exprs; i++) {
6002                 nft_expr_destroy(ctx, expr_array[i]);
6003                 expr_array[i] = NULL;
6004         }
6005
6006         return -ENOMEM;
6007 }
6008
6009 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6010                                             const struct nft_set *set)
6011 {
6012         struct nft_set_elem_catchall *catchall;
6013         u8 genmask = nft_genmask_cur(net);
6014         struct nft_set_ext *ext;
6015
6016         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6017                 ext = nft_set_elem_ext(set, catchall->elem);
6018                 if (nft_set_elem_active(ext, genmask) &&
6019                     !nft_set_elem_expired(ext))
6020                         return ext;
6021         }
6022
6023         return NULL;
6024 }
6025 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6026
6027 void *nft_set_catchall_gc(const struct nft_set *set)
6028 {
6029         struct nft_set_elem_catchall *catchall, *next;
6030         struct nft_set_ext *ext;
6031         void *elem = NULL;
6032
6033         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6034                 ext = nft_set_elem_ext(set, catchall->elem);
6035
6036                 if (!nft_set_elem_expired(ext) ||
6037                     nft_set_elem_mark_busy(ext))
6038                         continue;
6039
6040                 elem = catchall->elem;
6041                 list_del_rcu(&catchall->list);
6042                 kfree_rcu(catchall, rcu);
6043                 break;
6044         }
6045
6046         return elem;
6047 }
6048 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6049
6050 static int nft_setelem_catchall_insert(const struct net *net,
6051                                        struct nft_set *set,
6052                                        const struct nft_set_elem *elem,
6053                                        struct nft_set_ext **pext)
6054 {
6055         struct nft_set_elem_catchall *catchall;
6056         u8 genmask = nft_genmask_next(net);
6057         struct nft_set_ext *ext;
6058
6059         list_for_each_entry(catchall, &set->catchall_list, list) {
6060                 ext = nft_set_elem_ext(set, catchall->elem);
6061                 if (nft_set_elem_active(ext, genmask)) {
6062                         *pext = ext;
6063                         return -EEXIST;
6064                 }
6065         }
6066
6067         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6068         if (!catchall)
6069                 return -ENOMEM;
6070
6071         catchall->elem = elem->priv;
6072         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6073
6074         return 0;
6075 }
6076
6077 static int nft_setelem_insert(const struct net *net,
6078                               struct nft_set *set,
6079                               const struct nft_set_elem *elem,
6080                               struct nft_set_ext **ext, unsigned int flags)
6081 {
6082         int ret;
6083
6084         if (flags & NFT_SET_ELEM_CATCHALL)
6085                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6086         else
6087                 ret = set->ops->insert(net, set, elem, ext);
6088
6089         return ret;
6090 }
6091
6092 static bool nft_setelem_is_catchall(const struct nft_set *set,
6093                                     const struct nft_set_elem *elem)
6094 {
6095         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6096
6097         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6098             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6099                 return true;
6100
6101         return false;
6102 }
6103
6104 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6105                                  struct nft_set_elem *elem)
6106 {
6107         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6108
6109         if (nft_setelem_is_catchall(set, elem)) {
6110                 nft_set_elem_change_active(net, set, ext);
6111                 nft_set_elem_clear_busy(ext);
6112         } else {
6113                 set->ops->activate(net, set, elem);
6114         }
6115 }
6116
6117 static int nft_setelem_catchall_deactivate(const struct net *net,
6118                                            struct nft_set *set,
6119                                            struct nft_set_elem *elem)
6120 {
6121         struct nft_set_elem_catchall *catchall;
6122         struct nft_set_ext *ext;
6123
6124         list_for_each_entry(catchall, &set->catchall_list, list) {
6125                 ext = nft_set_elem_ext(set, catchall->elem);
6126                 if (!nft_is_active(net, ext) ||
6127                     nft_set_elem_mark_busy(ext))
6128                         continue;
6129
6130                 kfree(elem->priv);
6131                 elem->priv = catchall->elem;
6132                 nft_set_elem_change_active(net, set, ext);
6133                 return 0;
6134         }
6135
6136         return -ENOENT;
6137 }
6138
6139 static int __nft_setelem_deactivate(const struct net *net,
6140                                     struct nft_set *set,
6141                                     struct nft_set_elem *elem)
6142 {
6143         void *priv;
6144
6145         priv = set->ops->deactivate(net, set, elem);
6146         if (!priv)
6147                 return -ENOENT;
6148
6149         kfree(elem->priv);
6150         elem->priv = priv;
6151         set->ndeact++;
6152
6153         return 0;
6154 }
6155
6156 static int nft_setelem_deactivate(const struct net *net,
6157                                   struct nft_set *set,
6158                                   struct nft_set_elem *elem, u32 flags)
6159 {
6160         int ret;
6161
6162         if (flags & NFT_SET_ELEM_CATCHALL)
6163                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6164         else
6165                 ret = __nft_setelem_deactivate(net, set, elem);
6166
6167         return ret;
6168 }
6169
6170 static void nft_setelem_catchall_remove(const struct net *net,
6171                                         const struct nft_set *set,
6172                                         const struct nft_set_elem *elem)
6173 {
6174         struct nft_set_elem_catchall *catchall, *next;
6175
6176         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6177                 if (catchall->elem == elem->priv) {
6178                         list_del_rcu(&catchall->list);
6179                         kfree_rcu(catchall, rcu);
6180                         break;
6181                 }
6182         }
6183 }
6184
6185 static void nft_setelem_remove(const struct net *net,
6186                                const struct nft_set *set,
6187                                const struct nft_set_elem *elem)
6188 {
6189         if (nft_setelem_is_catchall(set, elem))
6190                 nft_setelem_catchall_remove(net, set, elem);
6191         else
6192                 set->ops->remove(net, set, elem);
6193 }
6194
6195 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6196                                       struct nlattr **nla, u32 flags)
6197 {
6198         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6199                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6200                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6201                         return false;
6202
6203                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6204                     flags & NFT_SET_ELEM_CATCHALL)
6205                         return false;
6206         } else {
6207                 if (nla[NFTA_SET_ELEM_KEY_END])
6208                         return false;
6209         }
6210
6211         return true;
6212 }
6213
6214 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6215                             const struct nlattr *attr, u32 nlmsg_flags)
6216 {
6217         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6218         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6219         u8 genmask = nft_genmask_next(ctx->net);
6220         u32 flags = 0, size = 0, num_exprs = 0;
6221         struct nft_set_ext_tmpl tmpl;
6222         struct nft_set_ext *ext, *ext2;
6223         struct nft_set_elem elem;
6224         struct nft_set_binding *binding;
6225         struct nft_object *obj = NULL;
6226         struct nft_userdata *udata;
6227         struct nft_data_desc desc;
6228         enum nft_registers dreg;
6229         struct nft_trans *trans;
6230         u64 timeout;
6231         u64 expiration;
6232         int err, i;
6233         u8 ulen;
6234
6235         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6236                                           nft_set_elem_policy, NULL);
6237         if (err < 0)
6238                 return err;
6239
6240         nft_set_ext_prepare(&tmpl);
6241
6242         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6243         if (err < 0)
6244                 return err;
6245
6246         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6247             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6248                 return -EINVAL;
6249
6250         if (flags != 0) {
6251                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6252                 if (err < 0)
6253                         return err;
6254         }
6255
6256         if (set->flags & NFT_SET_MAP) {
6257                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6258                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6259                         return -EINVAL;
6260         } else {
6261                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6262                         return -EINVAL;
6263         }
6264
6265         if (set->flags & NFT_SET_OBJECT) {
6266                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6267                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6268                         return -EINVAL;
6269         } else {
6270                 if (nla[NFTA_SET_ELEM_OBJREF])
6271                         return -EINVAL;
6272         }
6273
6274         if (!nft_setelem_valid_key_end(set, nla, flags))
6275                 return -EINVAL;
6276
6277         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6278              (nla[NFTA_SET_ELEM_DATA] ||
6279               nla[NFTA_SET_ELEM_OBJREF] ||
6280               nla[NFTA_SET_ELEM_TIMEOUT] ||
6281               nla[NFTA_SET_ELEM_EXPIRATION] ||
6282               nla[NFTA_SET_ELEM_USERDATA] ||
6283               nla[NFTA_SET_ELEM_EXPR] ||
6284               nla[NFTA_SET_ELEM_KEY_END] ||
6285               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6286                 return -EINVAL;
6287
6288         timeout = 0;
6289         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6290                 if (!(set->flags & NFT_SET_TIMEOUT))
6291                         return -EINVAL;
6292                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6293                                             &timeout);
6294                 if (err)
6295                         return err;
6296         } else if (set->flags & NFT_SET_TIMEOUT &&
6297                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6298                 timeout = READ_ONCE(set->timeout);
6299         }
6300
6301         expiration = 0;
6302         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6303                 if (!(set->flags & NFT_SET_TIMEOUT))
6304                         return -EINVAL;
6305                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6306                                             &expiration);
6307                 if (err)
6308                         return err;
6309         }
6310
6311         if (nla[NFTA_SET_ELEM_EXPR]) {
6312                 struct nft_expr *expr;
6313
6314                 if (set->num_exprs && set->num_exprs != 1)
6315                         return -EOPNOTSUPP;
6316
6317                 expr = nft_set_elem_expr_alloc(ctx, set,
6318                                                nla[NFTA_SET_ELEM_EXPR]);
6319                 if (IS_ERR(expr))
6320                         return PTR_ERR(expr);
6321
6322                 expr_array[0] = expr;
6323                 num_exprs = 1;
6324
6325                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6326                         err = -EOPNOTSUPP;
6327                         goto err_set_elem_expr;
6328                 }
6329         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6330                 struct nft_expr *expr;
6331                 struct nlattr *tmp;
6332                 int left;
6333
6334                 i = 0;
6335                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6336                         if (i == NFT_SET_EXPR_MAX ||
6337                             (set->num_exprs && set->num_exprs == i)) {
6338                                 err = -E2BIG;
6339                                 goto err_set_elem_expr;
6340                         }
6341                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6342                                 err = -EINVAL;
6343                                 goto err_set_elem_expr;
6344                         }
6345                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6346                         if (IS_ERR(expr)) {
6347                                 err = PTR_ERR(expr);
6348                                 goto err_set_elem_expr;
6349                         }
6350                         expr_array[i] = expr;
6351                         num_exprs++;
6352
6353                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6354                                 err = -EOPNOTSUPP;
6355                                 goto err_set_elem_expr;
6356                         }
6357                         i++;
6358                 }
6359                 if (set->num_exprs && set->num_exprs != i) {
6360                         err = -EOPNOTSUPP;
6361                         goto err_set_elem_expr;
6362                 }
6363         } else if (set->num_exprs > 0 &&
6364                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6365                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6366                 if (err < 0)
6367                         goto err_set_elem_expr_clone;
6368
6369                 num_exprs = set->num_exprs;
6370         }
6371
6372         if (nla[NFTA_SET_ELEM_KEY]) {
6373                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6374                                             nla[NFTA_SET_ELEM_KEY]);
6375                 if (err < 0)
6376                         goto err_set_elem_expr;
6377
6378                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6379                 if (err < 0)
6380                         goto err_parse_key;
6381         }
6382
6383         if (nla[NFTA_SET_ELEM_KEY_END]) {
6384                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6385                                             nla[NFTA_SET_ELEM_KEY_END]);
6386                 if (err < 0)
6387                         goto err_parse_key;
6388
6389                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6390                 if (err < 0)
6391                         goto err_parse_key_end;
6392         }
6393
6394         if (timeout > 0) {
6395                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6396                 if (err < 0)
6397                         goto err_parse_key_end;
6398
6399                 if (timeout != READ_ONCE(set->timeout)) {
6400                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6401                         if (err < 0)
6402                                 goto err_parse_key_end;
6403                 }
6404         }
6405
6406         if (num_exprs) {
6407                 for (i = 0; i < num_exprs; i++)
6408                         size += expr_array[i]->ops->size;
6409
6410                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6411                                              sizeof(struct nft_set_elem_expr) + size);
6412                 if (err < 0)
6413                         goto err_parse_key_end;
6414         }
6415
6416         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6417                 obj = nft_obj_lookup(ctx->net, ctx->table,
6418                                      nla[NFTA_SET_ELEM_OBJREF],
6419                                      set->objtype, genmask);
6420                 if (IS_ERR(obj)) {
6421                         err = PTR_ERR(obj);
6422                         goto err_parse_key_end;
6423                 }
6424                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6425                 if (err < 0)
6426                         goto err_parse_key_end;
6427         }
6428
6429         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6430                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6431                                              nla[NFTA_SET_ELEM_DATA]);
6432                 if (err < 0)
6433                         goto err_parse_key_end;
6434
6435                 dreg = nft_type_to_reg(set->dtype);
6436                 list_for_each_entry(binding, &set->bindings, list) {
6437                         struct nft_ctx bind_ctx = {
6438                                 .net    = ctx->net,
6439                                 .family = ctx->family,
6440                                 .table  = ctx->table,
6441                                 .chain  = (struct nft_chain *)binding->chain,
6442                         };
6443
6444                         if (!(binding->flags & NFT_SET_MAP))
6445                                 continue;
6446
6447                         err = nft_validate_register_store(&bind_ctx, dreg,
6448                                                           &elem.data.val,
6449                                                           desc.type, desc.len);
6450                         if (err < 0)
6451                                 goto err_parse_data;
6452
6453                         if (desc.type == NFT_DATA_VERDICT &&
6454                             (elem.data.val.verdict.code == NFT_GOTO ||
6455                              elem.data.val.verdict.code == NFT_JUMP))
6456                                 nft_validate_state_update(ctx->table,
6457                                                           NFT_VALIDATE_NEED);
6458                 }
6459
6460                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6461                 if (err < 0)
6462                         goto err_parse_data;
6463         }
6464
6465         /* The full maximum length of userdata can exceed the maximum
6466          * offset value (U8_MAX) for following extensions, therefor it
6467          * must be the last extension added.
6468          */
6469         ulen = 0;
6470         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6471                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6472                 if (ulen > 0) {
6473                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6474                                                      ulen);
6475                         if (err < 0)
6476                                 goto err_parse_data;
6477                 }
6478         }
6479
6480         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6481                                       elem.key_end.val.data, elem.data.val.data,
6482                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6483         if (IS_ERR(elem.priv)) {
6484                 err = PTR_ERR(elem.priv);
6485                 goto err_parse_data;
6486         }
6487
6488         ext = nft_set_elem_ext(set, elem.priv);
6489         if (flags)
6490                 *nft_set_ext_flags(ext) = flags;
6491
6492         if (ulen > 0) {
6493                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6494                         err = -EINVAL;
6495                         goto err_elem_userdata;
6496                 }
6497                 udata = nft_set_ext_userdata(ext);
6498                 udata->len = ulen - 1;
6499                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6500         }
6501         if (obj) {
6502                 *nft_set_ext_obj(ext) = obj;
6503                 obj->use++;
6504         }
6505         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6506         if (err < 0)
6507                 goto err_elem_free;
6508
6509         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6510         if (trans == NULL) {
6511                 err = -ENOMEM;
6512                 goto err_elem_free;
6513         }
6514
6515         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6516
6517         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6518         if (err) {
6519                 if (err == -EEXIST) {
6520                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6521                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6522                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6523                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6524                                 goto err_element_clash;
6525                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6526                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6527                              memcmp(nft_set_ext_data(ext),
6528                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6529                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6530                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6531                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6532                                 goto err_element_clash;
6533                         else if (!(nlmsg_flags & NLM_F_EXCL))
6534                                 err = 0;
6535                 } else if (err == -ENOTEMPTY) {
6536                         /* ENOTEMPTY reports overlapping between this element
6537                          * and an existing one.
6538                          */
6539                         err = -EEXIST;
6540                 }
6541                 goto err_element_clash;
6542         }
6543
6544         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6545             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6546                 err = -ENFILE;
6547                 goto err_set_full;
6548         }
6549
6550         nft_trans_elem(trans) = elem;
6551         nft_trans_commit_list_add_tail(ctx->net, trans);
6552         return 0;
6553
6554 err_set_full:
6555         nft_setelem_remove(ctx->net, set, &elem);
6556 err_element_clash:
6557         kfree(trans);
6558 err_elem_free:
6559         if (obj)
6560                 obj->use--;
6561 err_elem_userdata:
6562         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6563 err_parse_data:
6564         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6565                 nft_data_release(&elem.data.val, desc.type);
6566 err_parse_key_end:
6567         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6568 err_parse_key:
6569         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6570 err_set_elem_expr:
6571         for (i = 0; i < num_exprs && expr_array[i]; i++)
6572                 nft_expr_destroy(ctx, expr_array[i]);
6573 err_set_elem_expr_clone:
6574         return err;
6575 }
6576
6577 static int nf_tables_newsetelem(struct sk_buff *skb,
6578                                 const struct nfnl_info *info,
6579                                 const struct nlattr * const nla[])
6580 {
6581         struct netlink_ext_ack *extack = info->extack;
6582         u8 genmask = nft_genmask_next(info->net);
6583         u8 family = info->nfmsg->nfgen_family;
6584         struct net *net = info->net;
6585         const struct nlattr *attr;
6586         struct nft_table *table;
6587         struct nft_set *set;
6588         struct nft_ctx ctx;
6589         int rem, err;
6590
6591         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6592                 return -EINVAL;
6593
6594         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6595                                  genmask, NETLINK_CB(skb).portid);
6596         if (IS_ERR(table)) {
6597                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6598                 return PTR_ERR(table);
6599         }
6600
6601         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6602                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6603         if (IS_ERR(set))
6604                 return PTR_ERR(set);
6605
6606         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6607                 return -EBUSY;
6608
6609         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6610
6611         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6612                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6613                 if (err < 0) {
6614                         NL_SET_BAD_ATTR(extack, attr);
6615                         return err;
6616                 }
6617         }
6618
6619         if (table->validate_state == NFT_VALIDATE_DO)
6620                 return nft_table_validate(net, table);
6621
6622         return 0;
6623 }
6624
6625 /**
6626  *      nft_data_hold - hold a nft_data item
6627  *
6628  *      @data: struct nft_data to release
6629  *      @type: type of data
6630  *
6631  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6632  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6633  *      NFT_GOTO verdicts. This function must be called on active data objects
6634  *      from the second phase of the commit protocol.
6635  */
6636 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6637 {
6638         struct nft_chain *chain;
6639         struct nft_rule *rule;
6640
6641         if (type == NFT_DATA_VERDICT) {
6642                 switch (data->verdict.code) {
6643                 case NFT_JUMP:
6644                 case NFT_GOTO:
6645                         chain = data->verdict.chain;
6646                         chain->use++;
6647
6648                         if (!nft_chain_is_bound(chain))
6649                                 break;
6650
6651                         chain->table->use++;
6652                         list_for_each_entry(rule, &chain->rules, list)
6653                                 chain->use++;
6654
6655                         nft_chain_add(chain->table, chain);
6656                         break;
6657                 }
6658         }
6659 }
6660
6661 static void nft_setelem_data_activate(const struct net *net,
6662                                       const struct nft_set *set,
6663                                       struct nft_set_elem *elem)
6664 {
6665         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6666
6667         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6668                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6669         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6670                 (*nft_set_ext_obj(ext))->use++;
6671 }
6672
6673 static void nft_setelem_data_deactivate(const struct net *net,
6674                                         const struct nft_set *set,
6675                                         struct nft_set_elem *elem)
6676 {
6677         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6678
6679         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6680                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6681         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6682                 (*nft_set_ext_obj(ext))->use--;
6683 }
6684
6685 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6686                            const struct nlattr *attr)
6687 {
6688         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6689         struct nft_set_ext_tmpl tmpl;
6690         struct nft_set_elem elem;
6691         struct nft_set_ext *ext;
6692         struct nft_trans *trans;
6693         u32 flags = 0;
6694         int err;
6695
6696         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6697                                           nft_set_elem_policy, NULL);
6698         if (err < 0)
6699                 return err;
6700
6701         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6702         if (err < 0)
6703                 return err;
6704
6705         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6706                 return -EINVAL;
6707
6708         if (!nft_setelem_valid_key_end(set, nla, flags))
6709                 return -EINVAL;
6710
6711         nft_set_ext_prepare(&tmpl);
6712
6713         if (flags != 0) {
6714                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6715                 if (err < 0)
6716                         return err;
6717         }
6718
6719         if (nla[NFTA_SET_ELEM_KEY]) {
6720                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6721                                             nla[NFTA_SET_ELEM_KEY]);
6722                 if (err < 0)
6723                         return err;
6724
6725                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6726                 if (err < 0)
6727                         goto fail_elem;
6728         }
6729
6730         if (nla[NFTA_SET_ELEM_KEY_END]) {
6731                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6732                                             nla[NFTA_SET_ELEM_KEY_END]);
6733                 if (err < 0)
6734                         goto fail_elem;
6735
6736                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6737                 if (err < 0)
6738                         goto fail_elem_key_end;
6739         }
6740
6741         err = -ENOMEM;
6742         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6743                                       elem.key_end.val.data, NULL, 0, 0,
6744                                       GFP_KERNEL_ACCOUNT);
6745         if (IS_ERR(elem.priv)) {
6746                 err = PTR_ERR(elem.priv);
6747                 goto fail_elem_key_end;
6748         }
6749
6750         ext = nft_set_elem_ext(set, elem.priv);
6751         if (flags)
6752                 *nft_set_ext_flags(ext) = flags;
6753
6754         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6755         if (trans == NULL)
6756                 goto fail_trans;
6757
6758         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6759         if (err < 0)
6760                 goto fail_ops;
6761
6762         nft_setelem_data_deactivate(ctx->net, set, &elem);
6763
6764         nft_trans_elem(trans) = elem;
6765         nft_trans_commit_list_add_tail(ctx->net, trans);
6766         return 0;
6767
6768 fail_ops:
6769         kfree(trans);
6770 fail_trans:
6771         kfree(elem.priv);
6772 fail_elem_key_end:
6773         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6774 fail_elem:
6775         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6776         return err;
6777 }
6778
6779 static int nft_setelem_flush(const struct nft_ctx *ctx,
6780                              struct nft_set *set,
6781                              const struct nft_set_iter *iter,
6782                              struct nft_set_elem *elem)
6783 {
6784         struct nft_trans *trans;
6785         int err;
6786
6787         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6788                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6789         if (!trans)
6790                 return -ENOMEM;
6791
6792         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6793                 err = -ENOENT;
6794                 goto err1;
6795         }
6796         set->ndeact++;
6797
6798         nft_setelem_data_deactivate(ctx->net, set, elem);
6799         nft_trans_elem_set(trans) = set;
6800         nft_trans_elem(trans) = *elem;
6801         nft_trans_commit_list_add_tail(ctx->net, trans);
6802
6803         return 0;
6804 err1:
6805         kfree(trans);
6806         return err;
6807 }
6808
6809 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6810                                     struct nft_set *set,
6811                                     struct nft_set_elem *elem)
6812 {
6813         struct nft_trans *trans;
6814
6815         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6816                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6817         if (!trans)
6818                 return -ENOMEM;
6819
6820         nft_setelem_data_deactivate(ctx->net, set, elem);
6821         nft_trans_elem_set(trans) = set;
6822         nft_trans_elem(trans) = *elem;
6823         nft_trans_commit_list_add_tail(ctx->net, trans);
6824
6825         return 0;
6826 }
6827
6828 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6829                                   struct nft_set *set)
6830 {
6831         u8 genmask = nft_genmask_next(ctx->net);
6832         struct nft_set_elem_catchall *catchall;
6833         struct nft_set_elem elem;
6834         struct nft_set_ext *ext;
6835         int ret = 0;
6836
6837         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6838                 ext = nft_set_elem_ext(set, catchall->elem);
6839                 if (!nft_set_elem_active(ext, genmask) ||
6840                     nft_set_elem_mark_busy(ext))
6841                         continue;
6842
6843                 elem.priv = catchall->elem;
6844                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6845                 if (ret < 0)
6846                         break;
6847         }
6848
6849         return ret;
6850 }
6851
6852 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6853 {
6854         struct nft_set_iter iter = {
6855                 .genmask        = genmask,
6856                 .fn             = nft_setelem_flush,
6857         };
6858
6859         set->ops->walk(ctx, set, &iter);
6860         if (!iter.err)
6861                 iter.err = nft_set_catchall_flush(ctx, set);
6862
6863         return iter.err;
6864 }
6865
6866 static int nf_tables_delsetelem(struct sk_buff *skb,
6867                                 const struct nfnl_info *info,
6868                                 const struct nlattr * const nla[])
6869 {
6870         struct netlink_ext_ack *extack = info->extack;
6871         u8 genmask = nft_genmask_next(info->net);
6872         u8 family = info->nfmsg->nfgen_family;
6873         struct net *net = info->net;
6874         const struct nlattr *attr;
6875         struct nft_table *table;
6876         struct nft_set *set;
6877         struct nft_ctx ctx;
6878         int rem, err = 0;
6879
6880         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6881                                  genmask, NETLINK_CB(skb).portid);
6882         if (IS_ERR(table)) {
6883                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6884                 return PTR_ERR(table);
6885         }
6886
6887         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6888         if (IS_ERR(set))
6889                 return PTR_ERR(set);
6890         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6891                 return -EBUSY;
6892
6893         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6894
6895         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6896                 return nft_set_flush(&ctx, set, genmask);
6897
6898         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6899                 err = nft_del_setelem(&ctx, set, attr);
6900                 if (err == -ENOENT &&
6901                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6902                         continue;
6903
6904                 if (err < 0) {
6905                         NL_SET_BAD_ATTR(extack, attr);
6906                         break;
6907                 }
6908         }
6909         return err;
6910 }
6911
6912 void nft_set_gc_batch_release(struct rcu_head *rcu)
6913 {
6914         struct nft_set_gc_batch *gcb;
6915         unsigned int i;
6916
6917         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6918         for (i = 0; i < gcb->head.cnt; i++)
6919                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6920         kfree(gcb);
6921 }
6922
6923 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6924                                                 gfp_t gfp)
6925 {
6926         struct nft_set_gc_batch *gcb;
6927
6928         gcb = kzalloc(sizeof(*gcb), gfp);
6929         if (gcb == NULL)
6930                 return gcb;
6931         gcb->head.set = set;
6932         return gcb;
6933 }
6934
6935 /*
6936  * Stateful objects
6937  */
6938
6939 /**
6940  *      nft_register_obj- register nf_tables stateful object type
6941  *      @obj_type: object type
6942  *
6943  *      Registers the object type for use with nf_tables. Returns zero on
6944  *      success or a negative errno code otherwise.
6945  */
6946 int nft_register_obj(struct nft_object_type *obj_type)
6947 {
6948         if (obj_type->type == NFT_OBJECT_UNSPEC)
6949                 return -EINVAL;
6950
6951         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6952         list_add_rcu(&obj_type->list, &nf_tables_objects);
6953         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6954         return 0;
6955 }
6956 EXPORT_SYMBOL_GPL(nft_register_obj);
6957
6958 /**
6959  *      nft_unregister_obj - unregister nf_tables object type
6960  *      @obj_type: object type
6961  *
6962  *      Unregisters the object type for use with nf_tables.
6963  */
6964 void nft_unregister_obj(struct nft_object_type *obj_type)
6965 {
6966         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6967         list_del_rcu(&obj_type->list);
6968         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6969 }
6970 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6971
6972 struct nft_object *nft_obj_lookup(const struct net *net,
6973                                   const struct nft_table *table,
6974                                   const struct nlattr *nla, u32 objtype,
6975                                   u8 genmask)
6976 {
6977         struct nft_object_hash_key k = { .table = table };
6978         char search[NFT_OBJ_MAXNAMELEN];
6979         struct rhlist_head *tmp, *list;
6980         struct nft_object *obj;
6981
6982         nla_strscpy(search, nla, sizeof(search));
6983         k.name = search;
6984
6985         WARN_ON_ONCE(!rcu_read_lock_held() &&
6986                      !lockdep_commit_lock_is_held(net));
6987
6988         rcu_read_lock();
6989         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6990         if (!list)
6991                 goto out;
6992
6993         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6994                 if (objtype == obj->ops->type->type &&
6995                     nft_active_genmask(obj, genmask)) {
6996                         rcu_read_unlock();
6997                         return obj;
6998                 }
6999         }
7000 out:
7001         rcu_read_unlock();
7002         return ERR_PTR(-ENOENT);
7003 }
7004 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7005
7006 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7007                                                   const struct nlattr *nla,
7008                                                   u32 objtype, u8 genmask)
7009 {
7010         struct nft_object *obj;
7011
7012         list_for_each_entry(obj, &table->objects, list) {
7013                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7014                     objtype == obj->ops->type->type &&
7015                     nft_active_genmask(obj, genmask))
7016                         return obj;
7017         }
7018         return ERR_PTR(-ENOENT);
7019 }
7020
7021 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7022         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7023                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7024         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7025                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7026         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7027         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7028         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7029         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7030                                     .len = NFT_USERDATA_MAXLEN },
7031 };
7032
7033 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7034                                        const struct nft_object_type *type,
7035                                        const struct nlattr *attr)
7036 {
7037         struct nlattr **tb;
7038         const struct nft_object_ops *ops;
7039         struct nft_object *obj;
7040         int err = -ENOMEM;
7041
7042         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7043         if (!tb)
7044                 goto err1;
7045
7046         if (attr) {
7047                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7048                                                   type->policy, NULL);
7049                 if (err < 0)
7050                         goto err2;
7051         } else {
7052                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7053         }
7054
7055         if (type->select_ops) {
7056                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7057                 if (IS_ERR(ops)) {
7058                         err = PTR_ERR(ops);
7059                         goto err2;
7060                 }
7061         } else {
7062                 ops = type->ops;
7063         }
7064
7065         err = -ENOMEM;
7066         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7067         if (!obj)
7068                 goto err2;
7069
7070         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7071         if (err < 0)
7072                 goto err3;
7073
7074         obj->ops = ops;
7075
7076         kfree(tb);
7077         return obj;
7078 err3:
7079         kfree(obj);
7080 err2:
7081         kfree(tb);
7082 err1:
7083         return ERR_PTR(err);
7084 }
7085
7086 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7087                            struct nft_object *obj, bool reset)
7088 {
7089         struct nlattr *nest;
7090
7091         nest = nla_nest_start_noflag(skb, attr);
7092         if (!nest)
7093                 goto nla_put_failure;
7094         if (obj->ops->dump(skb, obj, reset) < 0)
7095                 goto nla_put_failure;
7096         nla_nest_end(skb, nest);
7097         return 0;
7098
7099 nla_put_failure:
7100         return -1;
7101 }
7102
7103 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7104 {
7105         const struct nft_object_type *type;
7106
7107         list_for_each_entry(type, &nf_tables_objects, list) {
7108                 if (objtype == type->type)
7109                         return type;
7110         }
7111         return NULL;
7112 }
7113
7114 static const struct nft_object_type *
7115 nft_obj_type_get(struct net *net, u32 objtype)
7116 {
7117         const struct nft_object_type *type;
7118
7119         type = __nft_obj_type_get(objtype);
7120         if (type != NULL && try_module_get(type->owner))
7121                 return type;
7122
7123         lockdep_nfnl_nft_mutex_not_held();
7124 #ifdef CONFIG_MODULES
7125         if (type == NULL) {
7126                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7127                         return ERR_PTR(-EAGAIN);
7128         }
7129 #endif
7130         return ERR_PTR(-ENOENT);
7131 }
7132
7133 static int nf_tables_updobj(const struct nft_ctx *ctx,
7134                             const struct nft_object_type *type,
7135                             const struct nlattr *attr,
7136                             struct nft_object *obj)
7137 {
7138         struct nft_object *newobj;
7139         struct nft_trans *trans;
7140         int err = -ENOMEM;
7141
7142         if (!try_module_get(type->owner))
7143                 return -ENOENT;
7144
7145         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7146                                 sizeof(struct nft_trans_obj));
7147         if (!trans)
7148                 goto err_trans;
7149
7150         newobj = nft_obj_init(ctx, type, attr);
7151         if (IS_ERR(newobj)) {
7152                 err = PTR_ERR(newobj);
7153                 goto err_free_trans;
7154         }
7155
7156         nft_trans_obj(trans) = obj;
7157         nft_trans_obj_update(trans) = true;
7158         nft_trans_obj_newobj(trans) = newobj;
7159         nft_trans_commit_list_add_tail(ctx->net, trans);
7160
7161         return 0;
7162
7163 err_free_trans:
7164         kfree(trans);
7165 err_trans:
7166         module_put(type->owner);
7167         return err;
7168 }
7169
7170 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7171                             const struct nlattr * const nla[])
7172 {
7173         struct netlink_ext_ack *extack = info->extack;
7174         u8 genmask = nft_genmask_next(info->net);
7175         u8 family = info->nfmsg->nfgen_family;
7176         const struct nft_object_type *type;
7177         struct net *net = info->net;
7178         struct nft_table *table;
7179         struct nft_object *obj;
7180         struct nft_ctx ctx;
7181         u32 objtype;
7182         int err;
7183
7184         if (!nla[NFTA_OBJ_TYPE] ||
7185             !nla[NFTA_OBJ_NAME] ||
7186             !nla[NFTA_OBJ_DATA])
7187                 return -EINVAL;
7188
7189         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7190                                  NETLINK_CB(skb).portid);
7191         if (IS_ERR(table)) {
7192                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7193                 return PTR_ERR(table);
7194         }
7195
7196         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7197         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7198         if (IS_ERR(obj)) {
7199                 err = PTR_ERR(obj);
7200                 if (err != -ENOENT) {
7201                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7202                         return err;
7203                 }
7204         } else {
7205                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7206                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7207                         return -EEXIST;
7208                 }
7209                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7210                         return -EOPNOTSUPP;
7211
7212                 type = __nft_obj_type_get(objtype);
7213                 if (WARN_ON_ONCE(!type))
7214                         return -ENOENT;
7215
7216                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7217
7218                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7219         }
7220
7221         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7222
7223         type = nft_obj_type_get(net, objtype);
7224         if (IS_ERR(type))
7225                 return PTR_ERR(type);
7226
7227         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7228         if (IS_ERR(obj)) {
7229                 err = PTR_ERR(obj);
7230                 goto err_init;
7231         }
7232         obj->key.table = table;
7233         obj->handle = nf_tables_alloc_handle(table);
7234
7235         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7236         if (!obj->key.name) {
7237                 err = -ENOMEM;
7238                 goto err_strdup;
7239         }
7240
7241         if (nla[NFTA_OBJ_USERDATA]) {
7242                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7243                 if (obj->udata == NULL)
7244                         goto err_userdata;
7245
7246                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7247         }
7248
7249         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7250         if (err < 0)
7251                 goto err_trans;
7252
7253         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7254                               nft_objname_ht_params);
7255         if (err < 0)
7256                 goto err_obj_ht;
7257
7258         list_add_tail_rcu(&obj->list, &table->objects);
7259         table->use++;
7260         return 0;
7261 err_obj_ht:
7262         /* queued in transaction log */
7263         INIT_LIST_HEAD(&obj->list);
7264         return err;
7265 err_trans:
7266         kfree(obj->udata);
7267 err_userdata:
7268         kfree(obj->key.name);
7269 err_strdup:
7270         if (obj->ops->destroy)
7271                 obj->ops->destroy(&ctx, obj);
7272         kfree(obj);
7273 err_init:
7274         module_put(type->owner);
7275         return err;
7276 }
7277
7278 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7279                                    u32 portid, u32 seq, int event, u32 flags,
7280                                    int family, const struct nft_table *table,
7281                                    struct nft_object *obj, bool reset)
7282 {
7283         struct nlmsghdr *nlh;
7284
7285         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7286         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7287                            NFNETLINK_V0, nft_base_seq(net));
7288         if (!nlh)
7289                 goto nla_put_failure;
7290
7291         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7292             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7293             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7294                          NFTA_OBJ_PAD))
7295                 goto nla_put_failure;
7296
7297         if (event == NFT_MSG_DELOBJ) {
7298                 nlmsg_end(skb, nlh);
7299                 return 0;
7300         }
7301
7302         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7303             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7304             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7305                 goto nla_put_failure;
7306
7307         if (obj->udata &&
7308             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7309                 goto nla_put_failure;
7310
7311         nlmsg_end(skb, nlh);
7312         return 0;
7313
7314 nla_put_failure:
7315         nlmsg_trim(skb, nlh);
7316         return -1;
7317 }
7318
7319 struct nft_obj_filter {
7320         char            *table;
7321         u32             type;
7322 };
7323
7324 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7325 {
7326         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7327         const struct nft_table *table;
7328         unsigned int idx = 0, s_idx = cb->args[0];
7329         struct nft_obj_filter *filter = cb->data;
7330         struct net *net = sock_net(skb->sk);
7331         int family = nfmsg->nfgen_family;
7332         struct nftables_pernet *nft_net;
7333         struct nft_object *obj;
7334         bool reset = false;
7335
7336         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7337                 reset = true;
7338
7339         rcu_read_lock();
7340         nft_net = nft_pernet(net);
7341         cb->seq = READ_ONCE(nft_net->base_seq);
7342
7343         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7344                 if (family != NFPROTO_UNSPEC && family != table->family)
7345                         continue;
7346
7347                 list_for_each_entry_rcu(obj, &table->objects, list) {
7348                         if (!nft_is_active(net, obj))
7349                                 goto cont;
7350                         if (idx < s_idx)
7351                                 goto cont;
7352                         if (idx > s_idx)
7353                                 memset(&cb->args[1], 0,
7354                                        sizeof(cb->args) - sizeof(cb->args[0]));
7355                         if (filter && filter->table &&
7356                             strcmp(filter->table, table->name))
7357                                 goto cont;
7358                         if (filter &&
7359                             filter->type != NFT_OBJECT_UNSPEC &&
7360                             obj->ops->type->type != filter->type)
7361                                 goto cont;
7362                         if (reset) {
7363                                 char *buf = kasprintf(GFP_ATOMIC,
7364                                                       "%s:%u",
7365                                                       table->name,
7366                                                       nft_net->base_seq);
7367
7368                                 audit_log_nfcfg(buf,
7369                                                 family,
7370                                                 obj->handle,
7371                                                 AUDIT_NFT_OP_OBJ_RESET,
7372                                                 GFP_ATOMIC);
7373                                 kfree(buf);
7374                         }
7375
7376                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7377                                                     cb->nlh->nlmsg_seq,
7378                                                     NFT_MSG_NEWOBJ,
7379                                                     NLM_F_MULTI | NLM_F_APPEND,
7380                                                     table->family, table,
7381                                                     obj, reset) < 0)
7382                                 goto done;
7383
7384                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7385 cont:
7386                         idx++;
7387                 }
7388         }
7389 done:
7390         rcu_read_unlock();
7391
7392         cb->args[0] = idx;
7393         return skb->len;
7394 }
7395
7396 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7397 {
7398         const struct nlattr * const *nla = cb->data;
7399         struct nft_obj_filter *filter = NULL;
7400
7401         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7402                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7403                 if (!filter)
7404                         return -ENOMEM;
7405
7406                 if (nla[NFTA_OBJ_TABLE]) {
7407                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7408                         if (!filter->table) {
7409                                 kfree(filter);
7410                                 return -ENOMEM;
7411                         }
7412                 }
7413
7414                 if (nla[NFTA_OBJ_TYPE])
7415                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7416         }
7417
7418         cb->data = filter;
7419         return 0;
7420 }
7421
7422 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7423 {
7424         struct nft_obj_filter *filter = cb->data;
7425
7426         if (filter) {
7427                 kfree(filter->table);
7428                 kfree(filter);
7429         }
7430
7431         return 0;
7432 }
7433
7434 /* called with rcu_read_lock held */
7435 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7436                             const struct nlattr * const nla[])
7437 {
7438         struct netlink_ext_ack *extack = info->extack;
7439         u8 genmask = nft_genmask_cur(info->net);
7440         u8 family = info->nfmsg->nfgen_family;
7441         const struct nft_table *table;
7442         struct net *net = info->net;
7443         struct nft_object *obj;
7444         struct sk_buff *skb2;
7445         bool reset = false;
7446         u32 objtype;
7447         int err;
7448
7449         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7450                 struct netlink_dump_control c = {
7451                         .start = nf_tables_dump_obj_start,
7452                         .dump = nf_tables_dump_obj,
7453                         .done = nf_tables_dump_obj_done,
7454                         .module = THIS_MODULE,
7455                         .data = (void *)nla,
7456                 };
7457
7458                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7459         }
7460
7461         if (!nla[NFTA_OBJ_NAME] ||
7462             !nla[NFTA_OBJ_TYPE])
7463                 return -EINVAL;
7464
7465         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7466         if (IS_ERR(table)) {
7467                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7468                 return PTR_ERR(table);
7469         }
7470
7471         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7472         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7473         if (IS_ERR(obj)) {
7474                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7475                 return PTR_ERR(obj);
7476         }
7477
7478         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7479         if (!skb2)
7480                 return -ENOMEM;
7481
7482         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7483                 reset = true;
7484
7485         if (reset) {
7486                 const struct nftables_pernet *nft_net;
7487                 char *buf;
7488
7489                 nft_net = nft_pernet(net);
7490                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7491
7492                 audit_log_nfcfg(buf,
7493                                 family,
7494                                 obj->handle,
7495                                 AUDIT_NFT_OP_OBJ_RESET,
7496                                 GFP_ATOMIC);
7497                 kfree(buf);
7498         }
7499
7500         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7501                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7502                                       family, table, obj, reset);
7503         if (err < 0)
7504                 goto err_fill_obj_info;
7505
7506         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7507
7508 err_fill_obj_info:
7509         kfree_skb(skb2);
7510         return err;
7511 }
7512
7513 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7514 {
7515         if (obj->ops->destroy)
7516                 obj->ops->destroy(ctx, obj);
7517
7518         module_put(obj->ops->type->owner);
7519         kfree(obj->key.name);
7520         kfree(obj->udata);
7521         kfree(obj);
7522 }
7523
7524 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7525                             const struct nlattr * const nla[])
7526 {
7527         struct netlink_ext_ack *extack = info->extack;
7528         u8 genmask = nft_genmask_next(info->net);
7529         u8 family = info->nfmsg->nfgen_family;
7530         struct net *net = info->net;
7531         const struct nlattr *attr;
7532         struct nft_table *table;
7533         struct nft_object *obj;
7534         struct nft_ctx ctx;
7535         u32 objtype;
7536
7537         if (!nla[NFTA_OBJ_TYPE] ||
7538             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7539                 return -EINVAL;
7540
7541         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7542                                  NETLINK_CB(skb).portid);
7543         if (IS_ERR(table)) {
7544                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7545                 return PTR_ERR(table);
7546         }
7547
7548         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7549         if (nla[NFTA_OBJ_HANDLE]) {
7550                 attr = nla[NFTA_OBJ_HANDLE];
7551                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7552         } else {
7553                 attr = nla[NFTA_OBJ_NAME];
7554                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7555         }
7556
7557         if (IS_ERR(obj)) {
7558                 if (PTR_ERR(obj) == -ENOENT &&
7559                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7560                         return 0;
7561
7562                 NL_SET_BAD_ATTR(extack, attr);
7563                 return PTR_ERR(obj);
7564         }
7565         if (obj->use > 0) {
7566                 NL_SET_BAD_ATTR(extack, attr);
7567                 return -EBUSY;
7568         }
7569
7570         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7571
7572         return nft_delobj(&ctx, obj);
7573 }
7574
7575 void nft_obj_notify(struct net *net, const struct nft_table *table,
7576                     struct nft_object *obj, u32 portid, u32 seq, int event,
7577                     u16 flags, int family, int report, gfp_t gfp)
7578 {
7579         struct nftables_pernet *nft_net = nft_pernet(net);
7580         struct sk_buff *skb;
7581         int err;
7582         char *buf = kasprintf(gfp, "%s:%u",
7583                               table->name, nft_net->base_seq);
7584
7585         audit_log_nfcfg(buf,
7586                         family,
7587                         obj->handle,
7588                         event == NFT_MSG_NEWOBJ ?
7589                                  AUDIT_NFT_OP_OBJ_REGISTER :
7590                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7591                         gfp);
7592         kfree(buf);
7593
7594         if (!report &&
7595             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7596                 return;
7597
7598         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7599         if (skb == NULL)
7600                 goto err;
7601
7602         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7603                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7604                                       family, table, obj, false);
7605         if (err < 0) {
7606                 kfree_skb(skb);
7607                 goto err;
7608         }
7609
7610         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7611         return;
7612 err:
7613         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7614 }
7615 EXPORT_SYMBOL_GPL(nft_obj_notify);
7616
7617 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7618                                  struct nft_object *obj, int event)
7619 {
7620         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7621                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7622 }
7623
7624 /*
7625  * Flow tables
7626  */
7627 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7628 {
7629         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7630         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7631         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7632 }
7633 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7634
7635 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7636 {
7637         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7638         list_del_rcu(&type->list);
7639         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7640 }
7641 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7642
7643 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7644         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7645                                             .len = NFT_NAME_MAXLEN - 1 },
7646         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7647                                             .len = NFT_NAME_MAXLEN - 1 },
7648         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7649         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7650         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7651 };
7652
7653 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7654                                            const struct nlattr *nla, u8 genmask)
7655 {
7656         struct nft_flowtable *flowtable;
7657
7658         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7659                 if (!nla_strcmp(nla, flowtable->name) &&
7660                     nft_active_genmask(flowtable, genmask))
7661                         return flowtable;
7662         }
7663         return ERR_PTR(-ENOENT);
7664 }
7665 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7666
7667 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7668                                     struct nft_flowtable *flowtable,
7669                                     enum nft_trans_phase phase)
7670 {
7671         switch (phase) {
7672         case NFT_TRANS_PREPARE:
7673         case NFT_TRANS_ABORT:
7674         case NFT_TRANS_RELEASE:
7675                 flowtable->use--;
7676                 fallthrough;
7677         default:
7678                 return;
7679         }
7680 }
7681 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7682
7683 static struct nft_flowtable *
7684 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7685                               const struct nlattr *nla, u8 genmask)
7686 {
7687        struct nft_flowtable *flowtable;
7688
7689        list_for_each_entry(flowtable, &table->flowtables, list) {
7690                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7691                    nft_active_genmask(flowtable, genmask))
7692                        return flowtable;
7693        }
7694        return ERR_PTR(-ENOENT);
7695 }
7696
7697 struct nft_flowtable_hook {
7698         u32                     num;
7699         int                     priority;
7700         struct list_head        list;
7701 };
7702
7703 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7704         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7705         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7706         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7707 };
7708
7709 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7710                                     const struct nlattr * const nla[],
7711                                     struct nft_flowtable_hook *flowtable_hook,
7712                                     struct nft_flowtable *flowtable,
7713                                     struct netlink_ext_ack *extack, bool add)
7714 {
7715         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7716         struct nft_hook *hook;
7717         int hooknum, priority;
7718         int err;
7719
7720         INIT_LIST_HEAD(&flowtable_hook->list);
7721
7722         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7723                                           nla[NFTA_FLOWTABLE_HOOK],
7724                                           nft_flowtable_hook_policy, NULL);
7725         if (err < 0)
7726                 return err;
7727
7728         if (add) {
7729                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7730                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7731                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7732                         return -ENOENT;
7733                 }
7734
7735                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7736                 if (hooknum != NF_NETDEV_INGRESS)
7737                         return -EOPNOTSUPP;
7738
7739                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7740
7741                 flowtable_hook->priority        = priority;
7742                 flowtable_hook->num             = hooknum;
7743         } else {
7744                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7745                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7746                         if (hooknum != flowtable->hooknum)
7747                                 return -EOPNOTSUPP;
7748                 }
7749
7750                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7751                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7752                         if (priority != flowtable->data.priority)
7753                                 return -EOPNOTSUPP;
7754                 }
7755
7756                 flowtable_hook->priority        = flowtable->data.priority;
7757                 flowtable_hook->num             = flowtable->hooknum;
7758         }
7759
7760         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7761                 err = nf_tables_parse_netdev_hooks(ctx->net,
7762                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7763                                                    &flowtable_hook->list,
7764                                                    extack);
7765                 if (err < 0)
7766                         return err;
7767         }
7768
7769         list_for_each_entry(hook, &flowtable_hook->list, list) {
7770                 hook->ops.pf            = NFPROTO_NETDEV;
7771                 hook->ops.hooknum       = flowtable_hook->num;
7772                 hook->ops.priority      = flowtable_hook->priority;
7773                 hook->ops.priv          = &flowtable->data;
7774                 hook->ops.hook          = flowtable->data.type->hook;
7775         }
7776
7777         return err;
7778 }
7779
7780 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7781 {
7782         const struct nf_flowtable_type *type;
7783
7784         list_for_each_entry(type, &nf_tables_flowtables, list) {
7785                 if (family == type->family)
7786                         return type;
7787         }
7788         return NULL;
7789 }
7790
7791 static const struct nf_flowtable_type *
7792 nft_flowtable_type_get(struct net *net, u8 family)
7793 {
7794         const struct nf_flowtable_type *type;
7795
7796         type = __nft_flowtable_type_get(family);
7797         if (type != NULL && try_module_get(type->owner))
7798                 return type;
7799
7800         lockdep_nfnl_nft_mutex_not_held();
7801 #ifdef CONFIG_MODULES
7802         if (type == NULL) {
7803                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7804                         return ERR_PTR(-EAGAIN);
7805         }
7806 #endif
7807         return ERR_PTR(-ENOENT);
7808 }
7809
7810 /* Only called from error and netdev event paths. */
7811 static void nft_unregister_flowtable_hook(struct net *net,
7812                                           struct nft_flowtable *flowtable,
7813                                           struct nft_hook *hook)
7814 {
7815         nf_unregister_net_hook(net, &hook->ops);
7816         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7817                                     FLOW_BLOCK_UNBIND);
7818 }
7819
7820 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7821                                                  struct list_head *hook_list,
7822                                                  bool release_netdev)
7823 {
7824         struct nft_hook *hook, *next;
7825
7826         list_for_each_entry_safe(hook, next, hook_list, list) {
7827                 nf_unregister_net_hook(net, &hook->ops);
7828                 if (release_netdev) {
7829                         list_del(&hook->list);
7830                         kfree_rcu(hook, rcu);
7831                 }
7832         }
7833 }
7834
7835 static void nft_unregister_flowtable_net_hooks(struct net *net,
7836                                                struct list_head *hook_list)
7837 {
7838         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7839 }
7840
7841 static int nft_register_flowtable_net_hooks(struct net *net,
7842                                             struct nft_table *table,
7843                                             struct list_head *hook_list,
7844                                             struct nft_flowtable *flowtable)
7845 {
7846         struct nft_hook *hook, *hook2, *next;
7847         struct nft_flowtable *ft;
7848         int err, i = 0;
7849
7850         list_for_each_entry(hook, hook_list, list) {
7851                 list_for_each_entry(ft, &table->flowtables, list) {
7852                         if (!nft_is_active_next(net, ft))
7853                                 continue;
7854
7855                         list_for_each_entry(hook2, &ft->hook_list, list) {
7856                                 if (hook->ops.dev == hook2->ops.dev &&
7857                                     hook->ops.pf == hook2->ops.pf) {
7858                                         err = -EEXIST;
7859                                         goto err_unregister_net_hooks;
7860                                 }
7861                         }
7862                 }
7863
7864                 err = flowtable->data.type->setup(&flowtable->data,
7865                                                   hook->ops.dev,
7866                                                   FLOW_BLOCK_BIND);
7867                 if (err < 0)
7868                         goto err_unregister_net_hooks;
7869
7870                 err = nf_register_net_hook(net, &hook->ops);
7871                 if (err < 0) {
7872                         flowtable->data.type->setup(&flowtable->data,
7873                                                     hook->ops.dev,
7874                                                     FLOW_BLOCK_UNBIND);
7875                         goto err_unregister_net_hooks;
7876                 }
7877
7878                 i++;
7879         }
7880
7881         return 0;
7882
7883 err_unregister_net_hooks:
7884         list_for_each_entry_safe(hook, next, hook_list, list) {
7885                 if (i-- <= 0)
7886                         break;
7887
7888                 nft_unregister_flowtable_hook(net, flowtable, hook);
7889                 list_del_rcu(&hook->list);
7890                 kfree_rcu(hook, rcu);
7891         }
7892
7893         return err;
7894 }
7895
7896 static void nft_hooks_destroy(struct list_head *hook_list)
7897 {
7898         struct nft_hook *hook, *next;
7899
7900         list_for_each_entry_safe(hook, next, hook_list, list) {
7901                 list_del_rcu(&hook->list);
7902                 kfree_rcu(hook, rcu);
7903         }
7904 }
7905
7906 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7907                                 struct nft_flowtable *flowtable,
7908                                 struct netlink_ext_ack *extack)
7909 {
7910         const struct nlattr * const *nla = ctx->nla;
7911         struct nft_flowtable_hook flowtable_hook;
7912         struct nft_hook *hook, *next;
7913         struct nft_trans *trans;
7914         bool unregister = false;
7915         u32 flags;
7916         int err;
7917
7918         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
7919                                        extack, false);
7920         if (err < 0)
7921                 return err;
7922
7923         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7924                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7925                         list_del(&hook->list);
7926                         kfree(hook);
7927                 }
7928         }
7929
7930         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7931                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7932                 if (flags & ~NFT_FLOWTABLE_MASK) {
7933                         err = -EOPNOTSUPP;
7934                         goto err_flowtable_update_hook;
7935                 }
7936                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7937                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7938                         err = -EOPNOTSUPP;
7939                         goto err_flowtable_update_hook;
7940                 }
7941         } else {
7942                 flags = flowtable->data.flags;
7943         }
7944
7945         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7946                                                &flowtable_hook.list, flowtable);
7947         if (err < 0)
7948                 goto err_flowtable_update_hook;
7949
7950         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7951                                 sizeof(struct nft_trans_flowtable));
7952         if (!trans) {
7953                 unregister = true;
7954                 err = -ENOMEM;
7955                 goto err_flowtable_update_hook;
7956         }
7957
7958         nft_trans_flowtable_flags(trans) = flags;
7959         nft_trans_flowtable(trans) = flowtable;
7960         nft_trans_flowtable_update(trans) = true;
7961         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7962         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7963
7964         nft_trans_commit_list_add_tail(ctx->net, trans);
7965
7966         return 0;
7967
7968 err_flowtable_update_hook:
7969         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7970                 if (unregister)
7971                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7972                 list_del_rcu(&hook->list);
7973                 kfree_rcu(hook, rcu);
7974         }
7975
7976         return err;
7977
7978 }
7979
7980 static int nf_tables_newflowtable(struct sk_buff *skb,
7981                                   const struct nfnl_info *info,
7982                                   const struct nlattr * const nla[])
7983 {
7984         struct netlink_ext_ack *extack = info->extack;
7985         struct nft_flowtable_hook flowtable_hook;
7986         u8 genmask = nft_genmask_next(info->net);
7987         u8 family = info->nfmsg->nfgen_family;
7988         const struct nf_flowtable_type *type;
7989         struct nft_flowtable *flowtable;
7990         struct nft_hook *hook, *next;
7991         struct net *net = info->net;
7992         struct nft_table *table;
7993         struct nft_ctx ctx;
7994         int err;
7995
7996         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7997             !nla[NFTA_FLOWTABLE_NAME] ||
7998             !nla[NFTA_FLOWTABLE_HOOK])
7999                 return -EINVAL;
8000
8001         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8002                                  genmask, NETLINK_CB(skb).portid);
8003         if (IS_ERR(table)) {
8004                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8005                 return PTR_ERR(table);
8006         }
8007
8008         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8009                                          genmask);
8010         if (IS_ERR(flowtable)) {
8011                 err = PTR_ERR(flowtable);
8012                 if (err != -ENOENT) {
8013                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8014                         return err;
8015                 }
8016         } else {
8017                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8018                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8019                         return -EEXIST;
8020                 }
8021
8022                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8023
8024                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8025         }
8026
8027         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8028
8029         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8030         if (!flowtable)
8031                 return -ENOMEM;
8032
8033         flowtable->table = table;
8034         flowtable->handle = nf_tables_alloc_handle(table);
8035         INIT_LIST_HEAD(&flowtable->hook_list);
8036
8037         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8038         if (!flowtable->name) {
8039                 err = -ENOMEM;
8040                 goto err1;
8041         }
8042
8043         type = nft_flowtable_type_get(net, family);
8044         if (IS_ERR(type)) {
8045                 err = PTR_ERR(type);
8046                 goto err2;
8047         }
8048
8049         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8050                 flowtable->data.flags =
8051                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8052                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8053                         err = -EOPNOTSUPP;
8054                         goto err3;
8055                 }
8056         }
8057
8058         write_pnet(&flowtable->data.net, net);
8059         flowtable->data.type = type;
8060         err = type->init(&flowtable->data);
8061         if (err < 0)
8062                 goto err3;
8063
8064         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8065                                        extack, true);
8066         if (err < 0)
8067                 goto err4;
8068
8069         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8070         flowtable->data.priority = flowtable_hook.priority;
8071         flowtable->hooknum = flowtable_hook.num;
8072
8073         err = nft_register_flowtable_net_hooks(ctx.net, table,
8074                                                &flowtable->hook_list,
8075                                                flowtable);
8076         if (err < 0) {
8077                 nft_hooks_destroy(&flowtable->hook_list);
8078                 goto err4;
8079         }
8080
8081         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8082         if (err < 0)
8083                 goto err5;
8084
8085         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8086         table->use++;
8087
8088         return 0;
8089 err5:
8090         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8091                 nft_unregister_flowtable_hook(net, flowtable, hook);
8092                 list_del_rcu(&hook->list);
8093                 kfree_rcu(hook, rcu);
8094         }
8095 err4:
8096         flowtable->data.type->free(&flowtable->data);
8097 err3:
8098         module_put(type->owner);
8099 err2:
8100         kfree(flowtable->name);
8101 err1:
8102         kfree(flowtable);
8103         return err;
8104 }
8105
8106 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8107 {
8108         struct nft_hook *this, *next;
8109
8110         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8111                 list_del(&this->list);
8112                 kfree(this);
8113         }
8114 }
8115
8116 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8117                                  struct nft_flowtable *flowtable,
8118                                  struct netlink_ext_ack *extack)
8119 {
8120         const struct nlattr * const *nla = ctx->nla;
8121         struct nft_flowtable_hook flowtable_hook;
8122         LIST_HEAD(flowtable_del_list);
8123         struct nft_hook *this, *hook;
8124         struct nft_trans *trans;
8125         int err;
8126
8127         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8128                                        extack, false);
8129         if (err < 0)
8130                 return err;
8131
8132         list_for_each_entry(this, &flowtable_hook.list, list) {
8133                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8134                 if (!hook) {
8135                         err = -ENOENT;
8136                         goto err_flowtable_del_hook;
8137                 }
8138                 list_move(&hook->list, &flowtable_del_list);
8139         }
8140
8141         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8142                                 sizeof(struct nft_trans_flowtable));
8143         if (!trans) {
8144                 err = -ENOMEM;
8145                 goto err_flowtable_del_hook;
8146         }
8147
8148         nft_trans_flowtable(trans) = flowtable;
8149         nft_trans_flowtable_update(trans) = true;
8150         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8151         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8152         nft_flowtable_hook_release(&flowtable_hook);
8153
8154         nft_trans_commit_list_add_tail(ctx->net, trans);
8155
8156         return 0;
8157
8158 err_flowtable_del_hook:
8159         list_splice(&flowtable_del_list, &flowtable->hook_list);
8160         nft_flowtable_hook_release(&flowtable_hook);
8161
8162         return err;
8163 }
8164
8165 static int nf_tables_delflowtable(struct sk_buff *skb,
8166                                   const struct nfnl_info *info,
8167                                   const struct nlattr * const nla[])
8168 {
8169         struct netlink_ext_ack *extack = info->extack;
8170         u8 genmask = nft_genmask_next(info->net);
8171         u8 family = info->nfmsg->nfgen_family;
8172         struct nft_flowtable *flowtable;
8173         struct net *net = info->net;
8174         const struct nlattr *attr;
8175         struct nft_table *table;
8176         struct nft_ctx ctx;
8177
8178         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8179             (!nla[NFTA_FLOWTABLE_NAME] &&
8180              !nla[NFTA_FLOWTABLE_HANDLE]))
8181                 return -EINVAL;
8182
8183         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8184                                  genmask, NETLINK_CB(skb).portid);
8185         if (IS_ERR(table)) {
8186                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8187                 return PTR_ERR(table);
8188         }
8189
8190         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8191                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8192                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8193         } else {
8194                 attr = nla[NFTA_FLOWTABLE_NAME];
8195                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8196         }
8197
8198         if (IS_ERR(flowtable)) {
8199                 if (PTR_ERR(flowtable) == -ENOENT &&
8200                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8201                         return 0;
8202
8203                 NL_SET_BAD_ATTR(extack, attr);
8204                 return PTR_ERR(flowtable);
8205         }
8206
8207         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8208
8209         if (nla[NFTA_FLOWTABLE_HOOK])
8210                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8211
8212         if (flowtable->use > 0) {
8213                 NL_SET_BAD_ATTR(extack, attr);
8214                 return -EBUSY;
8215         }
8216
8217         return nft_delflowtable(&ctx, flowtable);
8218 }
8219
8220 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8221                                          u32 portid, u32 seq, int event,
8222                                          u32 flags, int family,
8223                                          struct nft_flowtable *flowtable,
8224                                          struct list_head *hook_list)
8225 {
8226         struct nlattr *nest, *nest_devs;
8227         struct nft_hook *hook;
8228         struct nlmsghdr *nlh;
8229
8230         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8231         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8232                            NFNETLINK_V0, nft_base_seq(net));
8233         if (!nlh)
8234                 goto nla_put_failure;
8235
8236         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8237             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8238             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8239                          NFTA_FLOWTABLE_PAD))
8240                 goto nla_put_failure;
8241
8242         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8243                 nlmsg_end(skb, nlh);
8244                 return 0;
8245         }
8246
8247         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8248             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8249                 goto nla_put_failure;
8250
8251         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8252         if (!nest)
8253                 goto nla_put_failure;
8254         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8255             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8256                 goto nla_put_failure;
8257
8258         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8259         if (!nest_devs)
8260                 goto nla_put_failure;
8261
8262         if (!hook_list)
8263                 hook_list = &flowtable->hook_list;
8264
8265         list_for_each_entry_rcu(hook, hook_list, list) {
8266                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8267                         goto nla_put_failure;
8268         }
8269         nla_nest_end(skb, nest_devs);
8270         nla_nest_end(skb, nest);
8271
8272         nlmsg_end(skb, nlh);
8273         return 0;
8274
8275 nla_put_failure:
8276         nlmsg_trim(skb, nlh);
8277         return -1;
8278 }
8279
8280 struct nft_flowtable_filter {
8281         char            *table;
8282 };
8283
8284 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8285                                     struct netlink_callback *cb)
8286 {
8287         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8288         struct nft_flowtable_filter *filter = cb->data;
8289         unsigned int idx = 0, s_idx = cb->args[0];
8290         struct net *net = sock_net(skb->sk);
8291         int family = nfmsg->nfgen_family;
8292         struct nft_flowtable *flowtable;
8293         struct nftables_pernet *nft_net;
8294         const struct nft_table *table;
8295
8296         rcu_read_lock();
8297         nft_net = nft_pernet(net);
8298         cb->seq = READ_ONCE(nft_net->base_seq);
8299
8300         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8301                 if (family != NFPROTO_UNSPEC && family != table->family)
8302                         continue;
8303
8304                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8305                         if (!nft_is_active(net, flowtable))
8306                                 goto cont;
8307                         if (idx < s_idx)
8308                                 goto cont;
8309                         if (idx > s_idx)
8310                                 memset(&cb->args[1], 0,
8311                                        sizeof(cb->args) - sizeof(cb->args[0]));
8312                         if (filter && filter->table &&
8313                             strcmp(filter->table, table->name))
8314                                 goto cont;
8315
8316                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8317                                                           cb->nlh->nlmsg_seq,
8318                                                           NFT_MSG_NEWFLOWTABLE,
8319                                                           NLM_F_MULTI | NLM_F_APPEND,
8320                                                           table->family,
8321                                                           flowtable, NULL) < 0)
8322                                 goto done;
8323
8324                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8325 cont:
8326                         idx++;
8327                 }
8328         }
8329 done:
8330         rcu_read_unlock();
8331
8332         cb->args[0] = idx;
8333         return skb->len;
8334 }
8335
8336 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8337 {
8338         const struct nlattr * const *nla = cb->data;
8339         struct nft_flowtable_filter *filter = NULL;
8340
8341         if (nla[NFTA_FLOWTABLE_TABLE]) {
8342                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8343                 if (!filter)
8344                         return -ENOMEM;
8345
8346                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8347                                            GFP_ATOMIC);
8348                 if (!filter->table) {
8349                         kfree(filter);
8350                         return -ENOMEM;
8351                 }
8352         }
8353
8354         cb->data = filter;
8355         return 0;
8356 }
8357
8358 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8359 {
8360         struct nft_flowtable_filter *filter = cb->data;
8361
8362         if (!filter)
8363                 return 0;
8364
8365         kfree(filter->table);
8366         kfree(filter);
8367
8368         return 0;
8369 }
8370
8371 /* called with rcu_read_lock held */
8372 static int nf_tables_getflowtable(struct sk_buff *skb,
8373                                   const struct nfnl_info *info,
8374                                   const struct nlattr * const nla[])
8375 {
8376         u8 genmask = nft_genmask_cur(info->net);
8377         u8 family = info->nfmsg->nfgen_family;
8378         struct nft_flowtable *flowtable;
8379         const struct nft_table *table;
8380         struct net *net = info->net;
8381         struct sk_buff *skb2;
8382         int err;
8383
8384         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8385                 struct netlink_dump_control c = {
8386                         .start = nf_tables_dump_flowtable_start,
8387                         .dump = nf_tables_dump_flowtable,
8388                         .done = nf_tables_dump_flowtable_done,
8389                         .module = THIS_MODULE,
8390                         .data = (void *)nla,
8391                 };
8392
8393                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8394         }
8395
8396         if (!nla[NFTA_FLOWTABLE_NAME])
8397                 return -EINVAL;
8398
8399         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8400                                  genmask, 0);
8401         if (IS_ERR(table))
8402                 return PTR_ERR(table);
8403
8404         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8405                                          genmask);
8406         if (IS_ERR(flowtable))
8407                 return PTR_ERR(flowtable);
8408
8409         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8410         if (!skb2)
8411                 return -ENOMEM;
8412
8413         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8414                                             info->nlh->nlmsg_seq,
8415                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8416                                             flowtable, NULL);
8417         if (err < 0)
8418                 goto err_fill_flowtable_info;
8419
8420         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8421
8422 err_fill_flowtable_info:
8423         kfree_skb(skb2);
8424         return err;
8425 }
8426
8427 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8428                                        struct nft_flowtable *flowtable,
8429                                        struct list_head *hook_list, int event)
8430 {
8431         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8432         struct sk_buff *skb;
8433         u16 flags = 0;
8434         int err;
8435
8436         if (!ctx->report &&
8437             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8438                 return;
8439
8440         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8441         if (skb == NULL)
8442                 goto err;
8443
8444         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8445                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8446
8447         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8448                                             ctx->seq, event, flags,
8449                                             ctx->family, flowtable, hook_list);
8450         if (err < 0) {
8451                 kfree_skb(skb);
8452                 goto err;
8453         }
8454
8455         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8456         return;
8457 err:
8458         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8459 }
8460
8461 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8462 {
8463         struct nft_hook *hook, *next;
8464
8465         flowtable->data.type->free(&flowtable->data);
8466         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8467                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8468                                             FLOW_BLOCK_UNBIND);
8469                 list_del_rcu(&hook->list);
8470                 kfree(hook);
8471         }
8472         kfree(flowtable->name);
8473         module_put(flowtable->data.type->owner);
8474         kfree(flowtable);
8475 }
8476
8477 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8478                                    u32 portid, u32 seq)
8479 {
8480         struct nftables_pernet *nft_net = nft_pernet(net);
8481         struct nlmsghdr *nlh;
8482         char buf[TASK_COMM_LEN];
8483         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8484
8485         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8486                            NFNETLINK_V0, nft_base_seq(net));
8487         if (!nlh)
8488                 goto nla_put_failure;
8489
8490         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8491             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8492             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8493                 goto nla_put_failure;
8494
8495         nlmsg_end(skb, nlh);
8496         return 0;
8497
8498 nla_put_failure:
8499         nlmsg_trim(skb, nlh);
8500         return -EMSGSIZE;
8501 }
8502
8503 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8504                                 struct nft_flowtable *flowtable)
8505 {
8506         struct nft_hook *hook;
8507
8508         list_for_each_entry(hook, &flowtable->hook_list, list) {
8509                 if (hook->ops.dev != dev)
8510                         continue;
8511
8512                 /* flow_offload_netdev_event() cleans up entries for us. */
8513                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8514                 list_del_rcu(&hook->list);
8515                 kfree_rcu(hook, rcu);
8516                 break;
8517         }
8518 }
8519
8520 static int nf_tables_flowtable_event(struct notifier_block *this,
8521                                      unsigned long event, void *ptr)
8522 {
8523         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8524         struct nft_flowtable *flowtable;
8525         struct nftables_pernet *nft_net;
8526         struct nft_table *table;
8527         struct net *net;
8528
8529         if (event != NETDEV_UNREGISTER)
8530                 return 0;
8531
8532         net = dev_net(dev);
8533         nft_net = nft_pernet(net);
8534         mutex_lock(&nft_net->commit_mutex);
8535         list_for_each_entry(table, &nft_net->tables, list) {
8536                 list_for_each_entry(flowtable, &table->flowtables, list) {
8537                         nft_flowtable_event(event, dev, flowtable);
8538                 }
8539         }
8540         mutex_unlock(&nft_net->commit_mutex);
8541
8542         return NOTIFY_DONE;
8543 }
8544
8545 static struct notifier_block nf_tables_flowtable_notifier = {
8546         .notifier_call  = nf_tables_flowtable_event,
8547 };
8548
8549 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8550                                  int event)
8551 {
8552         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8553         struct sk_buff *skb2;
8554         int err;
8555
8556         if (!nlmsg_report(nlh) &&
8557             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8558                 return;
8559
8560         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8561         if (skb2 == NULL)
8562                 goto err;
8563
8564         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8565                                       nlh->nlmsg_seq);
8566         if (err < 0) {
8567                 kfree_skb(skb2);
8568                 goto err;
8569         }
8570
8571         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8572                        nlmsg_report(nlh), GFP_KERNEL);
8573         return;
8574 err:
8575         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8576                           -ENOBUFS);
8577 }
8578
8579 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8580                             const struct nlattr * const nla[])
8581 {
8582         struct sk_buff *skb2;
8583         int err;
8584
8585         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8586         if (skb2 == NULL)
8587                 return -ENOMEM;
8588
8589         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8590                                       info->nlh->nlmsg_seq);
8591         if (err < 0)
8592                 goto err_fill_gen_info;
8593
8594         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8595
8596 err_fill_gen_info:
8597         kfree_skb(skb2);
8598         return err;
8599 }
8600
8601 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8602         [NFT_MSG_NEWTABLE] = {
8603                 .call           = nf_tables_newtable,
8604                 .type           = NFNL_CB_BATCH,
8605                 .attr_count     = NFTA_TABLE_MAX,
8606                 .policy         = nft_table_policy,
8607         },
8608         [NFT_MSG_GETTABLE] = {
8609                 .call           = nf_tables_gettable,
8610                 .type           = NFNL_CB_RCU,
8611                 .attr_count     = NFTA_TABLE_MAX,
8612                 .policy         = nft_table_policy,
8613         },
8614         [NFT_MSG_DELTABLE] = {
8615                 .call           = nf_tables_deltable,
8616                 .type           = NFNL_CB_BATCH,
8617                 .attr_count     = NFTA_TABLE_MAX,
8618                 .policy         = nft_table_policy,
8619         },
8620         [NFT_MSG_DESTROYTABLE] = {
8621                 .call           = nf_tables_deltable,
8622                 .type           = NFNL_CB_BATCH,
8623                 .attr_count     = NFTA_TABLE_MAX,
8624                 .policy         = nft_table_policy,
8625         },
8626         [NFT_MSG_NEWCHAIN] = {
8627                 .call           = nf_tables_newchain,
8628                 .type           = NFNL_CB_BATCH,
8629                 .attr_count     = NFTA_CHAIN_MAX,
8630                 .policy         = nft_chain_policy,
8631         },
8632         [NFT_MSG_GETCHAIN] = {
8633                 .call           = nf_tables_getchain,
8634                 .type           = NFNL_CB_RCU,
8635                 .attr_count     = NFTA_CHAIN_MAX,
8636                 .policy         = nft_chain_policy,
8637         },
8638         [NFT_MSG_DELCHAIN] = {
8639                 .call           = nf_tables_delchain,
8640                 .type           = NFNL_CB_BATCH,
8641                 .attr_count     = NFTA_CHAIN_MAX,
8642                 .policy         = nft_chain_policy,
8643         },
8644         [NFT_MSG_DESTROYCHAIN] = {
8645                 .call           = nf_tables_delchain,
8646                 .type           = NFNL_CB_BATCH,
8647                 .attr_count     = NFTA_CHAIN_MAX,
8648                 .policy         = nft_chain_policy,
8649         },
8650         [NFT_MSG_NEWRULE] = {
8651                 .call           = nf_tables_newrule,
8652                 .type           = NFNL_CB_BATCH,
8653                 .attr_count     = NFTA_RULE_MAX,
8654                 .policy         = nft_rule_policy,
8655         },
8656         [NFT_MSG_GETRULE] = {
8657                 .call           = nf_tables_getrule,
8658                 .type           = NFNL_CB_RCU,
8659                 .attr_count     = NFTA_RULE_MAX,
8660                 .policy         = nft_rule_policy,
8661         },
8662         [NFT_MSG_GETRULE_RESET] = {
8663                 .call           = nf_tables_getrule,
8664                 .type           = NFNL_CB_RCU,
8665                 .attr_count     = NFTA_RULE_MAX,
8666                 .policy         = nft_rule_policy,
8667         },
8668         [NFT_MSG_DELRULE] = {
8669                 .call           = nf_tables_delrule,
8670                 .type           = NFNL_CB_BATCH,
8671                 .attr_count     = NFTA_RULE_MAX,
8672                 .policy         = nft_rule_policy,
8673         },
8674         [NFT_MSG_DESTROYRULE] = {
8675                 .call           = nf_tables_delrule,
8676                 .type           = NFNL_CB_BATCH,
8677                 .attr_count     = NFTA_RULE_MAX,
8678                 .policy         = nft_rule_policy,
8679         },
8680         [NFT_MSG_NEWSET] = {
8681                 .call           = nf_tables_newset,
8682                 .type           = NFNL_CB_BATCH,
8683                 .attr_count     = NFTA_SET_MAX,
8684                 .policy         = nft_set_policy,
8685         },
8686         [NFT_MSG_GETSET] = {
8687                 .call           = nf_tables_getset,
8688                 .type           = NFNL_CB_RCU,
8689                 .attr_count     = NFTA_SET_MAX,
8690                 .policy         = nft_set_policy,
8691         },
8692         [NFT_MSG_DELSET] = {
8693                 .call           = nf_tables_delset,
8694                 .type           = NFNL_CB_BATCH,
8695                 .attr_count     = NFTA_SET_MAX,
8696                 .policy         = nft_set_policy,
8697         },
8698         [NFT_MSG_DESTROYSET] = {
8699                 .call           = nf_tables_delset,
8700                 .type           = NFNL_CB_BATCH,
8701                 .attr_count     = NFTA_SET_MAX,
8702                 .policy         = nft_set_policy,
8703         },
8704         [NFT_MSG_NEWSETELEM] = {
8705                 .call           = nf_tables_newsetelem,
8706                 .type           = NFNL_CB_BATCH,
8707                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8708                 .policy         = nft_set_elem_list_policy,
8709         },
8710         [NFT_MSG_GETSETELEM] = {
8711                 .call           = nf_tables_getsetelem,
8712                 .type           = NFNL_CB_RCU,
8713                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8714                 .policy         = nft_set_elem_list_policy,
8715         },
8716         [NFT_MSG_DELSETELEM] = {
8717                 .call           = nf_tables_delsetelem,
8718                 .type           = NFNL_CB_BATCH,
8719                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8720                 .policy         = nft_set_elem_list_policy,
8721         },
8722         [NFT_MSG_DESTROYSETELEM] = {
8723                 .call           = nf_tables_delsetelem,
8724                 .type           = NFNL_CB_BATCH,
8725                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8726                 .policy         = nft_set_elem_list_policy,
8727         },
8728         [NFT_MSG_GETGEN] = {
8729                 .call           = nf_tables_getgen,
8730                 .type           = NFNL_CB_RCU,
8731         },
8732         [NFT_MSG_NEWOBJ] = {
8733                 .call           = nf_tables_newobj,
8734                 .type           = NFNL_CB_BATCH,
8735                 .attr_count     = NFTA_OBJ_MAX,
8736                 .policy         = nft_obj_policy,
8737         },
8738         [NFT_MSG_GETOBJ] = {
8739                 .call           = nf_tables_getobj,
8740                 .type           = NFNL_CB_RCU,
8741                 .attr_count     = NFTA_OBJ_MAX,
8742                 .policy         = nft_obj_policy,
8743         },
8744         [NFT_MSG_DELOBJ] = {
8745                 .call           = nf_tables_delobj,
8746                 .type           = NFNL_CB_BATCH,
8747                 .attr_count     = NFTA_OBJ_MAX,
8748                 .policy         = nft_obj_policy,
8749         },
8750         [NFT_MSG_DESTROYOBJ] = {
8751                 .call           = nf_tables_delobj,
8752                 .type           = NFNL_CB_BATCH,
8753                 .attr_count     = NFTA_OBJ_MAX,
8754                 .policy         = nft_obj_policy,
8755         },
8756         [NFT_MSG_GETOBJ_RESET] = {
8757                 .call           = nf_tables_getobj,
8758                 .type           = NFNL_CB_RCU,
8759                 .attr_count     = NFTA_OBJ_MAX,
8760                 .policy         = nft_obj_policy,
8761         },
8762         [NFT_MSG_NEWFLOWTABLE] = {
8763                 .call           = nf_tables_newflowtable,
8764                 .type           = NFNL_CB_BATCH,
8765                 .attr_count     = NFTA_FLOWTABLE_MAX,
8766                 .policy         = nft_flowtable_policy,
8767         },
8768         [NFT_MSG_GETFLOWTABLE] = {
8769                 .call           = nf_tables_getflowtable,
8770                 .type           = NFNL_CB_RCU,
8771                 .attr_count     = NFTA_FLOWTABLE_MAX,
8772                 .policy         = nft_flowtable_policy,
8773         },
8774         [NFT_MSG_DELFLOWTABLE] = {
8775                 .call           = nf_tables_delflowtable,
8776                 .type           = NFNL_CB_BATCH,
8777                 .attr_count     = NFTA_FLOWTABLE_MAX,
8778                 .policy         = nft_flowtable_policy,
8779         },
8780         [NFT_MSG_DESTROYFLOWTABLE] = {
8781                 .call           = nf_tables_delflowtable,
8782                 .type           = NFNL_CB_BATCH,
8783                 .attr_count     = NFTA_FLOWTABLE_MAX,
8784                 .policy         = nft_flowtable_policy,
8785         },
8786 };
8787
8788 static int nf_tables_validate(struct net *net)
8789 {
8790         struct nftables_pernet *nft_net = nft_pernet(net);
8791         struct nft_table *table;
8792
8793         list_for_each_entry(table, &nft_net->tables, list) {
8794                 switch (table->validate_state) {
8795                 case NFT_VALIDATE_SKIP:
8796                         continue;
8797                 case NFT_VALIDATE_NEED:
8798                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8799                         fallthrough;
8800                 case NFT_VALIDATE_DO:
8801                         if (nft_table_validate(net, table) < 0)
8802                                 return -EAGAIN;
8803
8804                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8805                 }
8806
8807                 break;
8808         }
8809
8810         return 0;
8811 }
8812
8813 /* a drop policy has to be deferred until all rules have been activated,
8814  * otherwise a large ruleset that contains a drop-policy base chain will
8815  * cause all packets to get dropped until the full transaction has been
8816  * processed.
8817  *
8818  * We defer the drop policy until the transaction has been finalized.
8819  */
8820 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8821 {
8822         struct nft_base_chain *basechain;
8823
8824         if (nft_trans_chain_policy(trans) != NF_DROP)
8825                 return;
8826
8827         if (!nft_is_base_chain(trans->ctx.chain))
8828                 return;
8829
8830         basechain = nft_base_chain(trans->ctx.chain);
8831         basechain->policy = NF_DROP;
8832 }
8833
8834 static void nft_chain_commit_update(struct nft_trans *trans)
8835 {
8836         struct nft_base_chain *basechain;
8837
8838         if (nft_trans_chain_name(trans)) {
8839                 rhltable_remove(&trans->ctx.table->chains_ht,
8840                                 &trans->ctx.chain->rhlhead,
8841                                 nft_chain_ht_params);
8842                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8843                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8844                                     trans->ctx.chain->name,
8845                                     &trans->ctx.chain->rhlhead,
8846                                     nft_chain_ht_params);
8847         }
8848
8849         if (!nft_is_base_chain(trans->ctx.chain))
8850                 return;
8851
8852         nft_chain_stats_replace(trans);
8853
8854         basechain = nft_base_chain(trans->ctx.chain);
8855
8856         switch (nft_trans_chain_policy(trans)) {
8857         case NF_DROP:
8858         case NF_ACCEPT:
8859                 basechain->policy = nft_trans_chain_policy(trans);
8860                 break;
8861         }
8862 }
8863
8864 static void nft_obj_commit_update(struct nft_trans *trans)
8865 {
8866         struct nft_object *newobj;
8867         struct nft_object *obj;
8868
8869         obj = nft_trans_obj(trans);
8870         newobj = nft_trans_obj_newobj(trans);
8871
8872         if (obj->ops->update)
8873                 obj->ops->update(obj, newobj);
8874
8875         nft_obj_destroy(&trans->ctx, newobj);
8876 }
8877
8878 static void nft_commit_release(struct nft_trans *trans)
8879 {
8880         switch (trans->msg_type) {
8881         case NFT_MSG_DELTABLE:
8882         case NFT_MSG_DESTROYTABLE:
8883                 nf_tables_table_destroy(&trans->ctx);
8884                 break;
8885         case NFT_MSG_NEWCHAIN:
8886                 free_percpu(nft_trans_chain_stats(trans));
8887                 kfree(nft_trans_chain_name(trans));
8888                 break;
8889         case NFT_MSG_DELCHAIN:
8890         case NFT_MSG_DESTROYCHAIN:
8891                 if (nft_trans_chain_update(trans))
8892                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
8893                 else
8894                         nf_tables_chain_destroy(&trans->ctx);
8895                 break;
8896         case NFT_MSG_DELRULE:
8897         case NFT_MSG_DESTROYRULE:
8898                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8899                 break;
8900         case NFT_MSG_DELSET:
8901         case NFT_MSG_DESTROYSET:
8902                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8903                 break;
8904         case NFT_MSG_DELSETELEM:
8905         case NFT_MSG_DESTROYSETELEM:
8906                 nf_tables_set_elem_destroy(&trans->ctx,
8907                                            nft_trans_elem_set(trans),
8908                                            nft_trans_elem(trans).priv);
8909                 break;
8910         case NFT_MSG_DELOBJ:
8911         case NFT_MSG_DESTROYOBJ:
8912                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8913                 break;
8914         case NFT_MSG_DELFLOWTABLE:
8915         case NFT_MSG_DESTROYFLOWTABLE:
8916                 if (nft_trans_flowtable_update(trans))
8917                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8918                 else
8919                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8920                 break;
8921         }
8922
8923         if (trans->put_net)
8924                 put_net(trans->ctx.net);
8925
8926         kfree(trans);
8927 }
8928
8929 static void nf_tables_trans_destroy_work(struct work_struct *w)
8930 {
8931         struct nft_trans *trans, *next;
8932         LIST_HEAD(head);
8933
8934         spin_lock(&nf_tables_destroy_list_lock);
8935         list_splice_init(&nf_tables_destroy_list, &head);
8936         spin_unlock(&nf_tables_destroy_list_lock);
8937
8938         if (list_empty(&head))
8939                 return;
8940
8941         synchronize_rcu();
8942
8943         list_for_each_entry_safe(trans, next, &head, list) {
8944                 list_del(&trans->list);
8945                 nft_commit_release(trans);
8946         }
8947 }
8948
8949 void nf_tables_trans_destroy_flush_work(void)
8950 {
8951         flush_work(&trans_destroy_work);
8952 }
8953 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8954
8955 static bool nft_expr_reduce(struct nft_regs_track *track,
8956                             const struct nft_expr *expr)
8957 {
8958         return false;
8959 }
8960
8961 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8962 {
8963         const struct nft_expr *expr, *last;
8964         struct nft_regs_track track = {};
8965         unsigned int size, data_size;
8966         void *data, *data_boundary;
8967         struct nft_rule_dp *prule;
8968         struct nft_rule *rule;
8969
8970         /* already handled or inactive chain? */
8971         if (chain->blob_next || !nft_is_active_next(net, chain))
8972                 return 0;
8973
8974         data_size = 0;
8975         list_for_each_entry(rule, &chain->rules, list) {
8976                 if (nft_is_active_next(net, rule)) {
8977                         data_size += sizeof(*prule) + rule->dlen;
8978                         if (data_size > INT_MAX)
8979                                 return -ENOMEM;
8980                 }
8981         }
8982
8983         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8984         if (!chain->blob_next)
8985                 return -ENOMEM;
8986
8987         data = (void *)chain->blob_next->data;
8988         data_boundary = data + data_size;
8989         size = 0;
8990
8991         list_for_each_entry(rule, &chain->rules, list) {
8992                 if (!nft_is_active_next(net, rule))
8993                         continue;
8994
8995                 prule = (struct nft_rule_dp *)data;
8996                 data += offsetof(struct nft_rule_dp, data);
8997                 if (WARN_ON_ONCE(data > data_boundary))
8998                         return -ENOMEM;
8999
9000                 size = 0;
9001                 track.last = nft_expr_last(rule);
9002                 nft_rule_for_each_expr(expr, last, rule) {
9003                         track.cur = expr;
9004
9005                         if (nft_expr_reduce(&track, expr)) {
9006                                 expr = track.cur;
9007                                 continue;
9008                         }
9009
9010                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
9011                                 return -ENOMEM;
9012
9013                         memcpy(data + size, expr, expr->ops->size);
9014                         size += expr->ops->size;
9015                 }
9016                 if (WARN_ON_ONCE(size >= 1 << 12))
9017                         return -ENOMEM;
9018
9019                 prule->handle = rule->handle;
9020                 prule->dlen = size;
9021                 prule->is_last = 0;
9022
9023                 data += size;
9024                 size = 0;
9025                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9026         }
9027
9028         if (WARN_ON_ONCE(data > data_boundary))
9029                 return -ENOMEM;
9030
9031         prule = (struct nft_rule_dp *)data;
9032         nft_last_rule(chain, prule);
9033
9034         return 0;
9035 }
9036
9037 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9038 {
9039         struct nftables_pernet *nft_net = nft_pernet(net);
9040         struct nft_trans *trans, *next;
9041
9042         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9043                 struct nft_chain *chain = trans->ctx.chain;
9044
9045                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9046                     trans->msg_type == NFT_MSG_DELRULE) {
9047                         kvfree(chain->blob_next);
9048                         chain->blob_next = NULL;
9049                 }
9050         }
9051 }
9052
9053 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9054 {
9055         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9056
9057         kvfree(l->blob);
9058 }
9059
9060 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9061 {
9062         struct nft_rule_dp_last *last;
9063
9064         /* last rule trailer is after end marker */
9065         last = (void *)blob + sizeof(*blob) + blob->size;
9066         last->blob = blob;
9067
9068         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9069 }
9070
9071 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9072 {
9073         struct nft_rule_blob *g0, *g1;
9074         bool next_genbit;
9075
9076         next_genbit = nft_gencursor_next(net);
9077
9078         g0 = rcu_dereference_protected(chain->blob_gen_0,
9079                                        lockdep_commit_lock_is_held(net));
9080         g1 = rcu_dereference_protected(chain->blob_gen_1,
9081                                        lockdep_commit_lock_is_held(net));
9082
9083         /* No changes to this chain? */
9084         if (chain->blob_next == NULL) {
9085                 /* chain had no change in last or next generation */
9086                 if (g0 == g1)
9087                         return;
9088                 /*
9089                  * chain had no change in this generation; make sure next
9090                  * one uses same rules as current generation.
9091                  */
9092                 if (next_genbit) {
9093                         rcu_assign_pointer(chain->blob_gen_1, g0);
9094                         nf_tables_commit_chain_free_rules_old(g1);
9095                 } else {
9096                         rcu_assign_pointer(chain->blob_gen_0, g1);
9097                         nf_tables_commit_chain_free_rules_old(g0);
9098                 }
9099
9100                 return;
9101         }
9102
9103         if (next_genbit)
9104                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9105         else
9106                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9107
9108         chain->blob_next = NULL;
9109
9110         if (g0 == g1)
9111                 return;
9112
9113         if (next_genbit)
9114                 nf_tables_commit_chain_free_rules_old(g1);
9115         else
9116                 nf_tables_commit_chain_free_rules_old(g0);
9117 }
9118
9119 static void nft_obj_del(struct nft_object *obj)
9120 {
9121         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9122         list_del_rcu(&obj->list);
9123 }
9124
9125 void nft_chain_del(struct nft_chain *chain)
9126 {
9127         struct nft_table *table = chain->table;
9128
9129         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9130                                      nft_chain_ht_params));
9131         list_del_rcu(&chain->list);
9132 }
9133
9134 static void nf_tables_module_autoload_cleanup(struct net *net)
9135 {
9136         struct nftables_pernet *nft_net = nft_pernet(net);
9137         struct nft_module_request *req, *next;
9138
9139         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9140         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9141                 WARN_ON_ONCE(!req->done);
9142                 list_del(&req->list);
9143                 kfree(req);
9144         }
9145 }
9146
9147 static void nf_tables_commit_release(struct net *net)
9148 {
9149         struct nftables_pernet *nft_net = nft_pernet(net);
9150         struct nft_trans *trans;
9151
9152         /* all side effects have to be made visible.
9153          * For example, if a chain named 'foo' has been deleted, a
9154          * new transaction must not find it anymore.
9155          *
9156          * Memory reclaim happens asynchronously from work queue
9157          * to prevent expensive synchronize_rcu() in commit phase.
9158          */
9159         if (list_empty(&nft_net->commit_list)) {
9160                 nf_tables_module_autoload_cleanup(net);
9161                 mutex_unlock(&nft_net->commit_mutex);
9162                 return;
9163         }
9164
9165         trans = list_last_entry(&nft_net->commit_list,
9166                                 struct nft_trans, list);
9167         get_net(trans->ctx.net);
9168         WARN_ON_ONCE(trans->put_net);
9169
9170         trans->put_net = true;
9171         spin_lock(&nf_tables_destroy_list_lock);
9172         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9173         spin_unlock(&nf_tables_destroy_list_lock);
9174
9175         nf_tables_module_autoload_cleanup(net);
9176         schedule_work(&trans_destroy_work);
9177
9178         mutex_unlock(&nft_net->commit_mutex);
9179 }
9180
9181 static void nft_commit_notify(struct net *net, u32 portid)
9182 {
9183         struct nftables_pernet *nft_net = nft_pernet(net);
9184         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9185         unsigned char *data;
9186         int len;
9187
9188         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9189                 if (!batch_skb) {
9190 new_batch:
9191                         batch_skb = skb;
9192                         len = NLMSG_GOODSIZE - skb->len;
9193                         list_del(&skb->list);
9194                         continue;
9195                 }
9196                 len -= skb->len;
9197                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9198                         data = skb_put(batch_skb, skb->len);
9199                         memcpy(data, skb->data, skb->len);
9200                         list_del(&skb->list);
9201                         kfree_skb(skb);
9202                         continue;
9203                 }
9204                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9205                                NFT_CB(batch_skb).report, GFP_KERNEL);
9206                 goto new_batch;
9207         }
9208
9209         if (batch_skb) {
9210                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9211                                NFT_CB(batch_skb).report, GFP_KERNEL);
9212         }
9213
9214         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9215 }
9216
9217 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9218                                         struct nft_table *table)
9219 {
9220         struct nft_audit_data *adp;
9221
9222         list_for_each_entry(adp, adl, list) {
9223                 if (adp->table == table)
9224                         return 0;
9225         }
9226         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9227         if (!adp)
9228                 return -ENOMEM;
9229         adp->table = table;
9230         list_add(&adp->list, adl);
9231         return 0;
9232 }
9233
9234 static void nf_tables_commit_audit_free(struct list_head *adl)
9235 {
9236         struct nft_audit_data *adp, *adn;
9237
9238         list_for_each_entry_safe(adp, adn, adl, list) {
9239                 list_del(&adp->list);
9240                 kfree(adp);
9241         }
9242 }
9243
9244 static void nf_tables_commit_audit_collect(struct list_head *adl,
9245                                            struct nft_table *table, u32 op)
9246 {
9247         struct nft_audit_data *adp;
9248
9249         list_for_each_entry(adp, adl, list) {
9250                 if (adp->table == table)
9251                         goto found;
9252         }
9253         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9254         return;
9255 found:
9256         adp->entries++;
9257         if (!adp->op || adp->op > op)
9258                 adp->op = op;
9259 }
9260
9261 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9262
9263 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9264 {
9265         struct nft_audit_data *adp, *adn;
9266         char aubuf[AUNFTABLENAMELEN];
9267
9268         list_for_each_entry_safe(adp, adn, adl, list) {
9269                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9270                          generation);
9271                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9272                                 nft2audit_op[adp->op], GFP_KERNEL);
9273                 list_del(&adp->list);
9274                 kfree(adp);
9275         }
9276 }
9277
9278 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9279 {
9280         struct nftables_pernet *nft_net = nft_pernet(net);
9281         struct nft_trans *trans, *next;
9282         struct nft_trans_elem *te;
9283         struct nft_chain *chain;
9284         struct nft_table *table;
9285         unsigned int base_seq;
9286         LIST_HEAD(adl);
9287         int err;
9288
9289         if (list_empty(&nft_net->commit_list)) {
9290                 mutex_unlock(&nft_net->commit_mutex);
9291                 return 0;
9292         }
9293
9294         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9295         if (nf_tables_validate(net) < 0)
9296                 return -EAGAIN;
9297
9298         err = nft_flow_rule_offload_commit(net);
9299         if (err < 0)
9300                 return err;
9301
9302         /* 1.  Allocate space for next generation rules_gen_X[] */
9303         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9304                 int ret;
9305
9306                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9307                 if (ret) {
9308                         nf_tables_commit_chain_prepare_cancel(net);
9309                         nf_tables_commit_audit_free(&adl);
9310                         return ret;
9311                 }
9312                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9313                     trans->msg_type == NFT_MSG_DELRULE) {
9314                         chain = trans->ctx.chain;
9315
9316                         ret = nf_tables_commit_chain_prepare(net, chain);
9317                         if (ret < 0) {
9318                                 nf_tables_commit_chain_prepare_cancel(net);
9319                                 nf_tables_commit_audit_free(&adl);
9320                                 return ret;
9321                         }
9322                 }
9323         }
9324
9325         /* step 2.  Make rules_gen_X visible to packet path */
9326         list_for_each_entry(table, &nft_net->tables, list) {
9327                 list_for_each_entry(chain, &table->chains, list)
9328                         nf_tables_commit_chain(net, chain);
9329         }
9330
9331         /*
9332          * Bump generation counter, invalidate any dump in progress.
9333          * Cannot fail after this point.
9334          */
9335         base_seq = READ_ONCE(nft_net->base_seq);
9336         while (++base_seq == 0)
9337                 ;
9338
9339         WRITE_ONCE(nft_net->base_seq, base_seq);
9340
9341         /* step 3. Start new generation, rules_gen_X now in use. */
9342         net->nft.gencursor = nft_gencursor_next(net);
9343
9344         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9345                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9346                                                trans->msg_type);
9347                 switch (trans->msg_type) {
9348                 case NFT_MSG_NEWTABLE:
9349                         if (nft_trans_table_update(trans)) {
9350                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9351                                         nft_trans_destroy(trans);
9352                                         break;
9353                                 }
9354                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9355                                         nf_tables_table_disable(net, trans->ctx.table);
9356
9357                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9358                         } else {
9359                                 nft_clear(net, trans->ctx.table);
9360                         }
9361                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9362                         nft_trans_destroy(trans);
9363                         break;
9364                 case NFT_MSG_DELTABLE:
9365                 case NFT_MSG_DESTROYTABLE:
9366                         list_del_rcu(&trans->ctx.table->list);
9367                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9368                         break;
9369                 case NFT_MSG_NEWCHAIN:
9370                         if (nft_trans_chain_update(trans)) {
9371                                 nft_chain_commit_update(trans);
9372                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9373                                                        &nft_trans_chain_hooks(trans));
9374                                 list_splice(&nft_trans_chain_hooks(trans),
9375                                             &nft_trans_basechain(trans)->hook_list);
9376                                 /* trans destroyed after rcu grace period */
9377                         } else {
9378                                 nft_chain_commit_drop_policy(trans);
9379                                 nft_clear(net, trans->ctx.chain);
9380                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9381                                 nft_trans_destroy(trans);
9382                         }
9383                         break;
9384                 case NFT_MSG_DELCHAIN:
9385                 case NFT_MSG_DESTROYCHAIN:
9386                         if (nft_trans_chain_update(trans)) {
9387                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9388                                                        &nft_trans_chain_hooks(trans));
9389                                 nft_netdev_unregister_hooks(net,
9390                                                             &nft_trans_chain_hooks(trans),
9391                                                             true);
9392                         } else {
9393                                 nft_chain_del(trans->ctx.chain);
9394                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9395                                                        NULL);
9396                                 nf_tables_unregister_hook(trans->ctx.net,
9397                                                           trans->ctx.table,
9398                                                           trans->ctx.chain);
9399                         }
9400                         break;
9401                 case NFT_MSG_NEWRULE:
9402                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9403                         nf_tables_rule_notify(&trans->ctx,
9404                                               nft_trans_rule(trans),
9405                                               NFT_MSG_NEWRULE);
9406                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9407                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9408
9409                         nft_trans_destroy(trans);
9410                         break;
9411                 case NFT_MSG_DELRULE:
9412                 case NFT_MSG_DESTROYRULE:
9413                         list_del_rcu(&nft_trans_rule(trans)->list);
9414                         nf_tables_rule_notify(&trans->ctx,
9415                                               nft_trans_rule(trans),
9416                                               trans->msg_type);
9417                         nft_rule_expr_deactivate(&trans->ctx,
9418                                                  nft_trans_rule(trans),
9419                                                  NFT_TRANS_COMMIT);
9420
9421                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9422                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9423                         break;
9424                 case NFT_MSG_NEWSET:
9425                         if (nft_trans_set_update(trans)) {
9426                                 struct nft_set *set = nft_trans_set(trans);
9427
9428                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9429                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9430                         } else {
9431                                 nft_clear(net, nft_trans_set(trans));
9432                                 /* This avoids hitting -EBUSY when deleting the table
9433                                  * from the transaction.
9434                                  */
9435                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9436                                     !list_empty(&nft_trans_set(trans)->bindings))
9437                                         trans->ctx.table->use--;
9438                         }
9439                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9440                                              NFT_MSG_NEWSET, GFP_KERNEL);
9441                         nft_trans_destroy(trans);
9442                         break;
9443                 case NFT_MSG_DELSET:
9444                 case NFT_MSG_DESTROYSET:
9445                         list_del_rcu(&nft_trans_set(trans)->list);
9446                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9447                                              trans->msg_type, GFP_KERNEL);
9448                         break;
9449                 case NFT_MSG_NEWSETELEM:
9450                         te = (struct nft_trans_elem *)trans->data;
9451
9452                         nft_setelem_activate(net, te->set, &te->elem);
9453                         nf_tables_setelem_notify(&trans->ctx, te->set,
9454                                                  &te->elem,
9455                                                  NFT_MSG_NEWSETELEM);
9456                         nft_trans_destroy(trans);
9457                         break;
9458                 case NFT_MSG_DELSETELEM:
9459                 case NFT_MSG_DESTROYSETELEM:
9460                         te = (struct nft_trans_elem *)trans->data;
9461
9462                         nf_tables_setelem_notify(&trans->ctx, te->set,
9463                                                  &te->elem,
9464                                                  trans->msg_type);
9465                         nft_setelem_remove(net, te->set, &te->elem);
9466                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9467                                 atomic_dec(&te->set->nelems);
9468                                 te->set->ndeact--;
9469                         }
9470                         break;
9471                 case NFT_MSG_NEWOBJ:
9472                         if (nft_trans_obj_update(trans)) {
9473                                 nft_obj_commit_update(trans);
9474                                 nf_tables_obj_notify(&trans->ctx,
9475                                                      nft_trans_obj(trans),
9476                                                      NFT_MSG_NEWOBJ);
9477                         } else {
9478                                 nft_clear(net, nft_trans_obj(trans));
9479                                 nf_tables_obj_notify(&trans->ctx,
9480                                                      nft_trans_obj(trans),
9481                                                      NFT_MSG_NEWOBJ);
9482                                 nft_trans_destroy(trans);
9483                         }
9484                         break;
9485                 case NFT_MSG_DELOBJ:
9486                 case NFT_MSG_DESTROYOBJ:
9487                         nft_obj_del(nft_trans_obj(trans));
9488                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9489                                              trans->msg_type);
9490                         break;
9491                 case NFT_MSG_NEWFLOWTABLE:
9492                         if (nft_trans_flowtable_update(trans)) {
9493                                 nft_trans_flowtable(trans)->data.flags =
9494                                         nft_trans_flowtable_flags(trans);
9495                                 nf_tables_flowtable_notify(&trans->ctx,
9496                                                            nft_trans_flowtable(trans),
9497                                                            &nft_trans_flowtable_hooks(trans),
9498                                                            NFT_MSG_NEWFLOWTABLE);
9499                                 list_splice(&nft_trans_flowtable_hooks(trans),
9500                                             &nft_trans_flowtable(trans)->hook_list);
9501                         } else {
9502                                 nft_clear(net, nft_trans_flowtable(trans));
9503                                 nf_tables_flowtable_notify(&trans->ctx,
9504                                                            nft_trans_flowtable(trans),
9505                                                            NULL,
9506                                                            NFT_MSG_NEWFLOWTABLE);
9507                         }
9508                         nft_trans_destroy(trans);
9509                         break;
9510                 case NFT_MSG_DELFLOWTABLE:
9511                 case NFT_MSG_DESTROYFLOWTABLE:
9512                         if (nft_trans_flowtable_update(trans)) {
9513                                 nf_tables_flowtable_notify(&trans->ctx,
9514                                                            nft_trans_flowtable(trans),
9515                                                            &nft_trans_flowtable_hooks(trans),
9516                                                            trans->msg_type);
9517                                 nft_unregister_flowtable_net_hooks(net,
9518                                                                    &nft_trans_flowtable_hooks(trans));
9519                         } else {
9520                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9521                                 nf_tables_flowtable_notify(&trans->ctx,
9522                                                            nft_trans_flowtable(trans),
9523                                                            NULL,
9524                                                            trans->msg_type);
9525                                 nft_unregister_flowtable_net_hooks(net,
9526                                                 &nft_trans_flowtable(trans)->hook_list);
9527                         }
9528                         break;
9529                 }
9530         }
9531
9532         nft_commit_notify(net, NETLINK_CB(skb).portid);
9533         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9534         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9535         nf_tables_commit_release(net);
9536
9537         return 0;
9538 }
9539
9540 static void nf_tables_module_autoload(struct net *net)
9541 {
9542         struct nftables_pernet *nft_net = nft_pernet(net);
9543         struct nft_module_request *req, *next;
9544         LIST_HEAD(module_list);
9545
9546         list_splice_init(&nft_net->module_list, &module_list);
9547         mutex_unlock(&nft_net->commit_mutex);
9548         list_for_each_entry_safe(req, next, &module_list, list) {
9549                 request_module("%s", req->module);
9550                 req->done = true;
9551         }
9552         mutex_lock(&nft_net->commit_mutex);
9553         list_splice(&module_list, &nft_net->module_list);
9554 }
9555
9556 static void nf_tables_abort_release(struct nft_trans *trans)
9557 {
9558         switch (trans->msg_type) {
9559         case NFT_MSG_NEWTABLE:
9560                 nf_tables_table_destroy(&trans->ctx);
9561                 break;
9562         case NFT_MSG_NEWCHAIN:
9563                 if (nft_trans_chain_update(trans))
9564                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9565                 else
9566                         nf_tables_chain_destroy(&trans->ctx);
9567                 break;
9568         case NFT_MSG_NEWRULE:
9569                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9570                 break;
9571         case NFT_MSG_NEWSET:
9572                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9573                 break;
9574         case NFT_MSG_NEWSETELEM:
9575                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9576                                      nft_trans_elem(trans).priv, true);
9577                 break;
9578         case NFT_MSG_NEWOBJ:
9579                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9580                 break;
9581         case NFT_MSG_NEWFLOWTABLE:
9582                 if (nft_trans_flowtable_update(trans))
9583                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9584                 else
9585                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9586                 break;
9587         }
9588         kfree(trans);
9589 }
9590
9591 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9592 {
9593         struct nftables_pernet *nft_net = nft_pernet(net);
9594         struct nft_trans *trans, *next;
9595         struct nft_trans_elem *te;
9596
9597         if (action == NFNL_ABORT_VALIDATE &&
9598             nf_tables_validate(net) < 0)
9599                 return -EAGAIN;
9600
9601         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9602                                          list) {
9603                 switch (trans->msg_type) {
9604                 case NFT_MSG_NEWTABLE:
9605                         if (nft_trans_table_update(trans)) {
9606                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9607                                         nft_trans_destroy(trans);
9608                                         break;
9609                                 }
9610                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9611                                         nf_tables_table_disable(net, trans->ctx.table);
9612                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9613                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9614                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9615                                 }
9616                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9617                                 nft_trans_destroy(trans);
9618                         } else {
9619                                 list_del_rcu(&trans->ctx.table->list);
9620                         }
9621                         break;
9622                 case NFT_MSG_DELTABLE:
9623                 case NFT_MSG_DESTROYTABLE:
9624                         nft_clear(trans->ctx.net, trans->ctx.table);
9625                         nft_trans_destroy(trans);
9626                         break;
9627                 case NFT_MSG_NEWCHAIN:
9628                         if (nft_trans_chain_update(trans)) {
9629                                 nft_netdev_unregister_hooks(net,
9630                                                             &nft_trans_chain_hooks(trans),
9631                                                             true);
9632                                 free_percpu(nft_trans_chain_stats(trans));
9633                                 kfree(nft_trans_chain_name(trans));
9634                                 nft_trans_destroy(trans);
9635                         } else {
9636                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9637                                         nft_trans_destroy(trans);
9638                                         break;
9639                                 }
9640                                 trans->ctx.table->use--;
9641                                 nft_chain_del(trans->ctx.chain);
9642                                 nf_tables_unregister_hook(trans->ctx.net,
9643                                                           trans->ctx.table,
9644                                                           trans->ctx.chain);
9645                         }
9646                         break;
9647                 case NFT_MSG_DELCHAIN:
9648                 case NFT_MSG_DESTROYCHAIN:
9649                         if (nft_trans_chain_update(trans)) {
9650                                 list_splice(&nft_trans_chain_hooks(trans),
9651                                             &nft_trans_basechain(trans)->hook_list);
9652                         } else {
9653                                 trans->ctx.table->use++;
9654                                 nft_clear(trans->ctx.net, trans->ctx.chain);
9655                         }
9656                         nft_trans_destroy(trans);
9657                         break;
9658                 case NFT_MSG_NEWRULE:
9659                         trans->ctx.chain->use--;
9660                         list_del_rcu(&nft_trans_rule(trans)->list);
9661                         nft_rule_expr_deactivate(&trans->ctx,
9662                                                  nft_trans_rule(trans),
9663                                                  NFT_TRANS_ABORT);
9664                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9665                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9666                         break;
9667                 case NFT_MSG_DELRULE:
9668                 case NFT_MSG_DESTROYRULE:
9669                         trans->ctx.chain->use++;
9670                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9671                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9672                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9673                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9674
9675                         nft_trans_destroy(trans);
9676                         break;
9677                 case NFT_MSG_NEWSET:
9678                         if (nft_trans_set_update(trans)) {
9679                                 nft_trans_destroy(trans);
9680                                 break;
9681                         }
9682                         trans->ctx.table->use--;
9683                         if (nft_trans_set_bound(trans)) {
9684                                 nft_trans_destroy(trans);
9685                                 break;
9686                         }
9687                         list_del_rcu(&nft_trans_set(trans)->list);
9688                         break;
9689                 case NFT_MSG_DELSET:
9690                 case NFT_MSG_DESTROYSET:
9691                         trans->ctx.table->use++;
9692                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9693                         nft_trans_destroy(trans);
9694                         break;
9695                 case NFT_MSG_NEWSETELEM:
9696                         if (nft_trans_elem_set_bound(trans)) {
9697                                 nft_trans_destroy(trans);
9698                                 break;
9699                         }
9700                         te = (struct nft_trans_elem *)trans->data;
9701                         nft_setelem_remove(net, te->set, &te->elem);
9702                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9703                                 atomic_dec(&te->set->nelems);
9704                         break;
9705                 case NFT_MSG_DELSETELEM:
9706                 case NFT_MSG_DESTROYSETELEM:
9707                         te = (struct nft_trans_elem *)trans->data;
9708
9709                         nft_setelem_data_activate(net, te->set, &te->elem);
9710                         nft_setelem_activate(net, te->set, &te->elem);
9711                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9712                                 te->set->ndeact--;
9713
9714                         nft_trans_destroy(trans);
9715                         break;
9716                 case NFT_MSG_NEWOBJ:
9717                         if (nft_trans_obj_update(trans)) {
9718                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9719                                 nft_trans_destroy(trans);
9720                         } else {
9721                                 trans->ctx.table->use--;
9722                                 nft_obj_del(nft_trans_obj(trans));
9723                         }
9724                         break;
9725                 case NFT_MSG_DELOBJ:
9726                 case NFT_MSG_DESTROYOBJ:
9727                         trans->ctx.table->use++;
9728                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9729                         nft_trans_destroy(trans);
9730                         break;
9731                 case NFT_MSG_NEWFLOWTABLE:
9732                         if (nft_trans_flowtable_update(trans)) {
9733                                 nft_unregister_flowtable_net_hooks(net,
9734                                                 &nft_trans_flowtable_hooks(trans));
9735                         } else {
9736                                 trans->ctx.table->use--;
9737                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9738                                 nft_unregister_flowtable_net_hooks(net,
9739                                                 &nft_trans_flowtable(trans)->hook_list);
9740                         }
9741                         break;
9742                 case NFT_MSG_DELFLOWTABLE:
9743                 case NFT_MSG_DESTROYFLOWTABLE:
9744                         if (nft_trans_flowtable_update(trans)) {
9745                                 list_splice(&nft_trans_flowtable_hooks(trans),
9746                                             &nft_trans_flowtable(trans)->hook_list);
9747                         } else {
9748                                 trans->ctx.table->use++;
9749                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9750                         }
9751                         nft_trans_destroy(trans);
9752                         break;
9753                 }
9754         }
9755
9756         synchronize_rcu();
9757
9758         list_for_each_entry_safe_reverse(trans, next,
9759                                          &nft_net->commit_list, list) {
9760                 list_del(&trans->list);
9761                 nf_tables_abort_release(trans);
9762         }
9763
9764         if (action == NFNL_ABORT_AUTOLOAD)
9765                 nf_tables_module_autoload(net);
9766         else
9767                 nf_tables_module_autoload_cleanup(net);
9768
9769         return 0;
9770 }
9771
9772 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9773                            enum nfnl_abort_action action)
9774 {
9775         struct nftables_pernet *nft_net = nft_pernet(net);
9776         int ret = __nf_tables_abort(net, action);
9777
9778         mutex_unlock(&nft_net->commit_mutex);
9779
9780         return ret;
9781 }
9782
9783 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9784 {
9785         struct nftables_pernet *nft_net = nft_pernet(net);
9786         bool genid_ok;
9787
9788         mutex_lock(&nft_net->commit_mutex);
9789
9790         genid_ok = genid == 0 || nft_net->base_seq == genid;
9791         if (!genid_ok)
9792                 mutex_unlock(&nft_net->commit_mutex);
9793
9794         /* else, commit mutex has to be released by commit or abort function */
9795         return genid_ok;
9796 }
9797
9798 static const struct nfnetlink_subsystem nf_tables_subsys = {
9799         .name           = "nf_tables",
9800         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9801         .cb_count       = NFT_MSG_MAX,
9802         .cb             = nf_tables_cb,
9803         .commit         = nf_tables_commit,
9804         .abort          = nf_tables_abort,
9805         .valid_genid    = nf_tables_valid_genid,
9806         .owner          = THIS_MODULE,
9807 };
9808
9809 int nft_chain_validate_dependency(const struct nft_chain *chain,
9810                                   enum nft_chain_types type)
9811 {
9812         const struct nft_base_chain *basechain;
9813
9814         if (nft_is_base_chain(chain)) {
9815                 basechain = nft_base_chain(chain);
9816                 if (basechain->type->type != type)
9817                         return -EOPNOTSUPP;
9818         }
9819         return 0;
9820 }
9821 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9822
9823 int nft_chain_validate_hooks(const struct nft_chain *chain,
9824                              unsigned int hook_flags)
9825 {
9826         struct nft_base_chain *basechain;
9827
9828         if (nft_is_base_chain(chain)) {
9829                 basechain = nft_base_chain(chain);
9830
9831                 if ((1 << basechain->ops.hooknum) & hook_flags)
9832                         return 0;
9833
9834                 return -EOPNOTSUPP;
9835         }
9836
9837         return 0;
9838 }
9839 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9840
9841 /*
9842  * Loop detection - walk through the ruleset beginning at the destination chain
9843  * of a new jump until either the source chain is reached (loop) or all
9844  * reachable chains have been traversed.
9845  *
9846  * The loop check is performed whenever a new jump verdict is added to an
9847  * expression or verdict map or a verdict map is bound to a new chain.
9848  */
9849
9850 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9851                                  const struct nft_chain *chain);
9852
9853 static int nft_check_loops(const struct nft_ctx *ctx,
9854                            const struct nft_set_ext *ext)
9855 {
9856         const struct nft_data *data;
9857         int ret;
9858
9859         data = nft_set_ext_data(ext);
9860         switch (data->verdict.code) {
9861         case NFT_JUMP:
9862         case NFT_GOTO:
9863                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9864                 break;
9865         default:
9866                 ret = 0;
9867                 break;
9868         }
9869
9870         return ret;
9871 }
9872
9873 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9874                                         struct nft_set *set,
9875                                         const struct nft_set_iter *iter,
9876                                         struct nft_set_elem *elem)
9877 {
9878         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9879
9880         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9881             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9882                 return 0;
9883
9884         return nft_check_loops(ctx, ext);
9885 }
9886
9887 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9888                                   struct nft_set *set)
9889 {
9890         u8 genmask = nft_genmask_next(ctx->net);
9891         struct nft_set_elem_catchall *catchall;
9892         struct nft_set_ext *ext;
9893         int ret = 0;
9894
9895         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9896                 ext = nft_set_elem_ext(set, catchall->elem);
9897                 if (!nft_set_elem_active(ext, genmask))
9898                         continue;
9899
9900                 ret = nft_check_loops(ctx, ext);
9901                 if (ret < 0)
9902                         return ret;
9903         }
9904
9905         return ret;
9906 }
9907
9908 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9909                                  const struct nft_chain *chain)
9910 {
9911         const struct nft_rule *rule;
9912         const struct nft_expr *expr, *last;
9913         struct nft_set *set;
9914         struct nft_set_binding *binding;
9915         struct nft_set_iter iter;
9916
9917         if (ctx->chain == chain)
9918                 return -ELOOP;
9919
9920         list_for_each_entry(rule, &chain->rules, list) {
9921                 nft_rule_for_each_expr(expr, last, rule) {
9922                         struct nft_immediate_expr *priv;
9923                         const struct nft_data *data;
9924                         int err;
9925
9926                         if (strcmp(expr->ops->type->name, "immediate"))
9927                                 continue;
9928
9929                         priv = nft_expr_priv(expr);
9930                         if (priv->dreg != NFT_REG_VERDICT)
9931                                 continue;
9932
9933                         data = &priv->data;
9934                         switch (data->verdict.code) {
9935                         case NFT_JUMP:
9936                         case NFT_GOTO:
9937                                 err = nf_tables_check_loops(ctx,
9938                                                         data->verdict.chain);
9939                                 if (err < 0)
9940                                         return err;
9941                                 break;
9942                         default:
9943                                 break;
9944                         }
9945                 }
9946         }
9947
9948         list_for_each_entry(set, &ctx->table->sets, list) {
9949                 if (!nft_is_active_next(ctx->net, set))
9950                         continue;
9951                 if (!(set->flags & NFT_SET_MAP) ||
9952                     set->dtype != NFT_DATA_VERDICT)
9953                         continue;
9954
9955                 list_for_each_entry(binding, &set->bindings, list) {
9956                         if (!(binding->flags & NFT_SET_MAP) ||
9957                             binding->chain != chain)
9958                                 continue;
9959
9960                         iter.genmask    = nft_genmask_next(ctx->net);
9961                         iter.skip       = 0;
9962                         iter.count      = 0;
9963                         iter.err        = 0;
9964                         iter.fn         = nf_tables_loop_check_setelem;
9965
9966                         set->ops->walk(ctx, set, &iter);
9967                         if (!iter.err)
9968                                 iter.err = nft_set_catchall_loops(ctx, set);
9969
9970                         if (iter.err < 0)
9971                                 return iter.err;
9972                 }
9973         }
9974
9975         return 0;
9976 }
9977
9978 /**
9979  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9980  *
9981  *      @attr: netlink attribute to fetch value from
9982  *      @max: maximum value to be stored in dest
9983  *      @dest: pointer to the variable
9984  *
9985  *      Parse, check and store a given u32 netlink attribute into variable.
9986  *      This function returns -ERANGE if the value goes over maximum value.
9987  *      Otherwise a 0 is returned and the attribute value is stored in the
9988  *      destination variable.
9989  */
9990 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9991 {
9992         u32 val;
9993
9994         val = ntohl(nla_get_be32(attr));
9995         if (val > max)
9996                 return -ERANGE;
9997
9998         *dest = val;
9999         return 0;
10000 }
10001 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10002
10003 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10004 {
10005         unsigned int reg;
10006
10007         reg = ntohl(nla_get_be32(attr));
10008         switch (reg) {
10009         case NFT_REG_VERDICT...NFT_REG_4:
10010                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10011                 break;
10012         case NFT_REG32_00...NFT_REG32_15:
10013                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10014                 break;
10015         default:
10016                 return -ERANGE;
10017         }
10018
10019         return 0;
10020 }
10021
10022 /**
10023  *      nft_dump_register - dump a register value to a netlink attribute
10024  *
10025  *      @skb: socket buffer
10026  *      @attr: attribute number
10027  *      @reg: register number
10028  *
10029  *      Construct a netlink attribute containing the register number. For
10030  *      compatibility reasons, register numbers being a multiple of 4 are
10031  *      translated to the corresponding 128 bit register numbers.
10032  */
10033 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10034 {
10035         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10036                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10037         else
10038                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10039
10040         return nla_put_be32(skb, attr, htonl(reg));
10041 }
10042 EXPORT_SYMBOL_GPL(nft_dump_register);
10043
10044 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10045 {
10046         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10047                 return -EINVAL;
10048         if (len == 0)
10049                 return -EINVAL;
10050         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10051                 return -ERANGE;
10052
10053         return 0;
10054 }
10055
10056 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10057 {
10058         u32 reg;
10059         int err;
10060
10061         err = nft_parse_register(attr, &reg);
10062         if (err < 0)
10063                 return err;
10064
10065         err = nft_validate_register_load(reg, len);
10066         if (err < 0)
10067                 return err;
10068
10069         *sreg = reg;
10070         return 0;
10071 }
10072 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10073
10074 static int nft_validate_register_store(const struct nft_ctx *ctx,
10075                                        enum nft_registers reg,
10076                                        const struct nft_data *data,
10077                                        enum nft_data_types type,
10078                                        unsigned int len)
10079 {
10080         int err;
10081
10082         switch (reg) {
10083         case NFT_REG_VERDICT:
10084                 if (type != NFT_DATA_VERDICT)
10085                         return -EINVAL;
10086
10087                 if (data != NULL &&
10088                     (data->verdict.code == NFT_GOTO ||
10089                      data->verdict.code == NFT_JUMP)) {
10090                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10091                         if (err < 0)
10092                                 return err;
10093                 }
10094
10095                 return 0;
10096         default:
10097                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10098                         return -EINVAL;
10099                 if (len == 0)
10100                         return -EINVAL;
10101                 if (reg * NFT_REG32_SIZE + len >
10102                     sizeof_field(struct nft_regs, data))
10103                         return -ERANGE;
10104
10105                 if (data != NULL && type != NFT_DATA_VALUE)
10106                         return -EINVAL;
10107                 return 0;
10108         }
10109 }
10110
10111 int nft_parse_register_store(const struct nft_ctx *ctx,
10112                              const struct nlattr *attr, u8 *dreg,
10113                              const struct nft_data *data,
10114                              enum nft_data_types type, unsigned int len)
10115 {
10116         int err;
10117         u32 reg;
10118
10119         err = nft_parse_register(attr, &reg);
10120         if (err < 0)
10121                 return err;
10122
10123         err = nft_validate_register_store(ctx, reg, data, type, len);
10124         if (err < 0)
10125                 return err;
10126
10127         *dreg = reg;
10128         return 0;
10129 }
10130 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10131
10132 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10133         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10134         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10135                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10136         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10137 };
10138
10139 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10140                             struct nft_data_desc *desc, const struct nlattr *nla)
10141 {
10142         u8 genmask = nft_genmask_next(ctx->net);
10143         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10144         struct nft_chain *chain;
10145         int err;
10146
10147         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10148                                           nft_verdict_policy, NULL);
10149         if (err < 0)
10150                 return err;
10151
10152         if (!tb[NFTA_VERDICT_CODE])
10153                 return -EINVAL;
10154         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10155
10156         switch (data->verdict.code) {
10157         default:
10158                 switch (data->verdict.code & NF_VERDICT_MASK) {
10159                 case NF_ACCEPT:
10160                 case NF_DROP:
10161                 case NF_QUEUE:
10162                         break;
10163                 default:
10164                         return -EINVAL;
10165                 }
10166                 fallthrough;
10167         case NFT_CONTINUE:
10168         case NFT_BREAK:
10169         case NFT_RETURN:
10170                 break;
10171         case NFT_JUMP:
10172         case NFT_GOTO:
10173                 if (tb[NFTA_VERDICT_CHAIN]) {
10174                         chain = nft_chain_lookup(ctx->net, ctx->table,
10175                                                  tb[NFTA_VERDICT_CHAIN],
10176                                                  genmask);
10177                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10178                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10179                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10180                         if (IS_ERR(chain))
10181                                 return PTR_ERR(chain);
10182                 } else {
10183                         return -EINVAL;
10184                 }
10185
10186                 if (IS_ERR(chain))
10187                         return PTR_ERR(chain);
10188                 if (nft_is_base_chain(chain))
10189                         return -EOPNOTSUPP;
10190                 if (nft_chain_is_bound(chain))
10191                         return -EINVAL;
10192                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10193                     chain->flags & NFT_CHAIN_BINDING)
10194                         return -EINVAL;
10195
10196                 chain->use++;
10197                 data->verdict.chain = chain;
10198                 break;
10199         }
10200
10201         desc->len = sizeof(data->verdict);
10202
10203         return 0;
10204 }
10205
10206 static void nft_verdict_uninit(const struct nft_data *data)
10207 {
10208         struct nft_chain *chain;
10209         struct nft_rule *rule;
10210
10211         switch (data->verdict.code) {
10212         case NFT_JUMP:
10213         case NFT_GOTO:
10214                 chain = data->verdict.chain;
10215                 chain->use--;
10216
10217                 if (!nft_chain_is_bound(chain))
10218                         break;
10219
10220                 chain->table->use--;
10221                 list_for_each_entry(rule, &chain->rules, list)
10222                         chain->use--;
10223
10224                 nft_chain_del(chain);
10225                 break;
10226         }
10227 }
10228
10229 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10230 {
10231         struct nlattr *nest;
10232
10233         nest = nla_nest_start_noflag(skb, type);
10234         if (!nest)
10235                 goto nla_put_failure;
10236
10237         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10238                 goto nla_put_failure;
10239
10240         switch (v->code) {
10241         case NFT_JUMP:
10242         case NFT_GOTO:
10243                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10244                                    v->chain->name))
10245                         goto nla_put_failure;
10246         }
10247         nla_nest_end(skb, nest);
10248         return 0;
10249
10250 nla_put_failure:
10251         return -1;
10252 }
10253
10254 static int nft_value_init(const struct nft_ctx *ctx,
10255                           struct nft_data *data, struct nft_data_desc *desc,
10256                           const struct nlattr *nla)
10257 {
10258         unsigned int len;
10259
10260         len = nla_len(nla);
10261         if (len == 0)
10262                 return -EINVAL;
10263         if (len > desc->size)
10264                 return -EOVERFLOW;
10265         if (desc->len) {
10266                 if (len != desc->len)
10267                         return -EINVAL;
10268         } else {
10269                 desc->len = len;
10270         }
10271
10272         nla_memcpy(data->data, nla, len);
10273
10274         return 0;
10275 }
10276
10277 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10278                           unsigned int len)
10279 {
10280         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10281 }
10282
10283 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10284         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10285         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10286 };
10287
10288 /**
10289  *      nft_data_init - parse nf_tables data netlink attributes
10290  *
10291  *      @ctx: context of the expression using the data
10292  *      @data: destination struct nft_data
10293  *      @desc: data description
10294  *      @nla: netlink attribute containing data
10295  *
10296  *      Parse the netlink data attributes and initialize a struct nft_data.
10297  *      The type and length of data are returned in the data description.
10298  *
10299  *      The caller can indicate that it only wants to accept data of type
10300  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10301  */
10302 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10303                   struct nft_data_desc *desc, const struct nlattr *nla)
10304 {
10305         struct nlattr *tb[NFTA_DATA_MAX + 1];
10306         int err;
10307
10308         if (WARN_ON_ONCE(!desc->size))
10309                 return -EINVAL;
10310
10311         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10312                                           nft_data_policy, NULL);
10313         if (err < 0)
10314                 return err;
10315
10316         if (tb[NFTA_DATA_VALUE]) {
10317                 if (desc->type != NFT_DATA_VALUE)
10318                         return -EINVAL;
10319
10320                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10321         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10322                 if (desc->type != NFT_DATA_VERDICT)
10323                         return -EINVAL;
10324
10325                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10326         } else {
10327                 err = -EINVAL;
10328         }
10329
10330         return err;
10331 }
10332 EXPORT_SYMBOL_GPL(nft_data_init);
10333
10334 /**
10335  *      nft_data_release - release a nft_data item
10336  *
10337  *      @data: struct nft_data to release
10338  *      @type: type of data
10339  *
10340  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10341  *      all others need to be released by calling this function.
10342  */
10343 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10344 {
10345         if (type < NFT_DATA_VERDICT)
10346                 return;
10347         switch (type) {
10348         case NFT_DATA_VERDICT:
10349                 return nft_verdict_uninit(data);
10350         default:
10351                 WARN_ON(1);
10352         }
10353 }
10354 EXPORT_SYMBOL_GPL(nft_data_release);
10355
10356 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10357                   enum nft_data_types type, unsigned int len)
10358 {
10359         struct nlattr *nest;
10360         int err;
10361
10362         nest = nla_nest_start_noflag(skb, attr);
10363         if (nest == NULL)
10364                 return -1;
10365
10366         switch (type) {
10367         case NFT_DATA_VALUE:
10368                 err = nft_value_dump(skb, data, len);
10369                 break;
10370         case NFT_DATA_VERDICT:
10371                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10372                 break;
10373         default:
10374                 err = -EINVAL;
10375                 WARN_ON(1);
10376         }
10377
10378         nla_nest_end(skb, nest);
10379         return err;
10380 }
10381 EXPORT_SYMBOL_GPL(nft_data_dump);
10382
10383 int __nft_release_basechain(struct nft_ctx *ctx)
10384 {
10385         struct nft_rule *rule, *nr;
10386
10387         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10388                 return 0;
10389
10390         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10391         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10392                 list_del(&rule->list);
10393                 ctx->chain->use--;
10394                 nf_tables_rule_release(ctx, rule);
10395         }
10396         nft_chain_del(ctx->chain);
10397         ctx->table->use--;
10398         nf_tables_chain_destroy(ctx);
10399
10400         return 0;
10401 }
10402 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10403
10404 static void __nft_release_hook(struct net *net, struct nft_table *table)
10405 {
10406         struct nft_flowtable *flowtable;
10407         struct nft_chain *chain;
10408
10409         list_for_each_entry(chain, &table->chains, list)
10410                 __nf_tables_unregister_hook(net, table, chain, true);
10411         list_for_each_entry(flowtable, &table->flowtables, list)
10412                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10413                                                      true);
10414 }
10415
10416 static void __nft_release_hooks(struct net *net)
10417 {
10418         struct nftables_pernet *nft_net = nft_pernet(net);
10419         struct nft_table *table;
10420
10421         list_for_each_entry(table, &nft_net->tables, list) {
10422                 if (nft_table_has_owner(table))
10423                         continue;
10424
10425                 __nft_release_hook(net, table);
10426         }
10427 }
10428
10429 static void __nft_release_table(struct net *net, struct nft_table *table)
10430 {
10431         struct nft_flowtable *flowtable, *nf;
10432         struct nft_chain *chain, *nc;
10433         struct nft_object *obj, *ne;
10434         struct nft_rule *rule, *nr;
10435         struct nft_set *set, *ns;
10436         struct nft_ctx ctx = {
10437                 .net    = net,
10438                 .family = NFPROTO_NETDEV,
10439         };
10440
10441         ctx.family = table->family;
10442         ctx.table = table;
10443         list_for_each_entry(chain, &table->chains, list) {
10444                 ctx.chain = chain;
10445                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10446                         list_del(&rule->list);
10447                         chain->use--;
10448                         nf_tables_rule_release(&ctx, rule);
10449                 }
10450         }
10451         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10452                 list_del(&flowtable->list);
10453                 table->use--;
10454                 nf_tables_flowtable_destroy(flowtable);
10455         }
10456         list_for_each_entry_safe(set, ns, &table->sets, list) {
10457                 list_del(&set->list);
10458                 table->use--;
10459                 nft_set_destroy(&ctx, set);
10460         }
10461         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10462                 nft_obj_del(obj);
10463                 table->use--;
10464                 nft_obj_destroy(&ctx, obj);
10465         }
10466         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10467                 ctx.chain = chain;
10468                 nft_chain_del(chain);
10469                 table->use--;
10470                 nf_tables_chain_destroy(&ctx);
10471         }
10472         nf_tables_table_destroy(&ctx);
10473 }
10474
10475 static void __nft_release_tables(struct net *net)
10476 {
10477         struct nftables_pernet *nft_net = nft_pernet(net);
10478         struct nft_table *table, *nt;
10479
10480         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10481                 if (nft_table_has_owner(table))
10482                         continue;
10483
10484                 list_del(&table->list);
10485
10486                 __nft_release_table(net, table);
10487         }
10488 }
10489
10490 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10491                             void *ptr)
10492 {
10493         struct nft_table *table, *to_delete[8];
10494         struct nftables_pernet *nft_net;
10495         struct netlink_notify *n = ptr;
10496         struct net *net = n->net;
10497         unsigned int deleted;
10498         bool restart = false;
10499
10500         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10501                 return NOTIFY_DONE;
10502
10503         nft_net = nft_pernet(net);
10504         deleted = 0;
10505         mutex_lock(&nft_net->commit_mutex);
10506         if (!list_empty(&nf_tables_destroy_list))
10507                 rcu_barrier();
10508 again:
10509         list_for_each_entry(table, &nft_net->tables, list) {
10510                 if (nft_table_has_owner(table) &&
10511                     n->portid == table->nlpid) {
10512                         __nft_release_hook(net, table);
10513                         list_del_rcu(&table->list);
10514                         to_delete[deleted++] = table;
10515                         if (deleted >= ARRAY_SIZE(to_delete))
10516                                 break;
10517                 }
10518         }
10519         if (deleted) {
10520                 restart = deleted >= ARRAY_SIZE(to_delete);
10521                 synchronize_rcu();
10522                 while (deleted)
10523                         __nft_release_table(net, to_delete[--deleted]);
10524
10525                 if (restart)
10526                         goto again;
10527         }
10528         mutex_unlock(&nft_net->commit_mutex);
10529
10530         return NOTIFY_DONE;
10531 }
10532
10533 static struct notifier_block nft_nl_notifier = {
10534         .notifier_call  = nft_rcv_nl_event,
10535 };
10536
10537 static int __net_init nf_tables_init_net(struct net *net)
10538 {
10539         struct nftables_pernet *nft_net = nft_pernet(net);
10540
10541         INIT_LIST_HEAD(&nft_net->tables);
10542         INIT_LIST_HEAD(&nft_net->commit_list);
10543         INIT_LIST_HEAD(&nft_net->module_list);
10544         INIT_LIST_HEAD(&nft_net->notify_list);
10545         mutex_init(&nft_net->commit_mutex);
10546         nft_net->base_seq = 1;
10547
10548         return 0;
10549 }
10550
10551 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10552 {
10553         struct nftables_pernet *nft_net = nft_pernet(net);
10554
10555         mutex_lock(&nft_net->commit_mutex);
10556         __nft_release_hooks(net);
10557         mutex_unlock(&nft_net->commit_mutex);
10558 }
10559
10560 static void __net_exit nf_tables_exit_net(struct net *net)
10561 {
10562         struct nftables_pernet *nft_net = nft_pernet(net);
10563
10564         mutex_lock(&nft_net->commit_mutex);
10565         if (!list_empty(&nft_net->commit_list) ||
10566             !list_empty(&nft_net->module_list))
10567                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10568         __nft_release_tables(net);
10569         mutex_unlock(&nft_net->commit_mutex);
10570         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10571         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10572         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10573 }
10574
10575 static struct pernet_operations nf_tables_net_ops = {
10576         .init           = nf_tables_init_net,
10577         .pre_exit       = nf_tables_pre_exit_net,
10578         .exit           = nf_tables_exit_net,
10579         .id             = &nf_tables_net_id,
10580         .size           = sizeof(struct nftables_pernet),
10581 };
10582
10583 static int __init nf_tables_module_init(void)
10584 {
10585         int err;
10586
10587         err = register_pernet_subsys(&nf_tables_net_ops);
10588         if (err < 0)
10589                 return err;
10590
10591         err = nft_chain_filter_init();
10592         if (err < 0)
10593                 goto err_chain_filter;
10594
10595         err = nf_tables_core_module_init();
10596         if (err < 0)
10597                 goto err_core_module;
10598
10599         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10600         if (err < 0)
10601                 goto err_netdev_notifier;
10602
10603         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10604         if (err < 0)
10605                 goto err_rht_objname;
10606
10607         err = nft_offload_init();
10608         if (err < 0)
10609                 goto err_offload;
10610
10611         err = netlink_register_notifier(&nft_nl_notifier);
10612         if (err < 0)
10613                 goto err_netlink_notifier;
10614
10615         /* must be last */
10616         err = nfnetlink_subsys_register(&nf_tables_subsys);
10617         if (err < 0)
10618                 goto err_nfnl_subsys;
10619
10620         nft_chain_route_init();
10621
10622         return err;
10623
10624 err_nfnl_subsys:
10625         netlink_unregister_notifier(&nft_nl_notifier);
10626 err_netlink_notifier:
10627         nft_offload_exit();
10628 err_offload:
10629         rhltable_destroy(&nft_objname_ht);
10630 err_rht_objname:
10631         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10632 err_netdev_notifier:
10633         nf_tables_core_module_exit();
10634 err_core_module:
10635         nft_chain_filter_fini();
10636 err_chain_filter:
10637         unregister_pernet_subsys(&nf_tables_net_ops);
10638         return err;
10639 }
10640
10641 static void __exit nf_tables_module_exit(void)
10642 {
10643         nfnetlink_subsys_unregister(&nf_tables_subsys);
10644         netlink_unregister_notifier(&nft_nl_notifier);
10645         nft_offload_exit();
10646         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10647         nft_chain_filter_fini();
10648         nft_chain_route_fini();
10649         unregister_pernet_subsys(&nf_tables_net_ops);
10650         cancel_work_sync(&trans_destroy_work);
10651         rcu_barrier();
10652         rhltable_destroy(&nft_objname_ht);
10653         nf_tables_core_module_exit();
10654 }
10655
10656 module_init(nf_tables_module_init);
10657 module_exit(nf_tables_module_exit);
10658
10659 MODULE_LICENSE("GPL");
10660 MODULE_AUTHOR("Patrick McHardy <[email protected]>");
10661 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);