net/sched/act_ct.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /* -
   3  * net/sched/act_ct.c  Connection Tracking action
   4  *
   5  * Authors:   Paul Blakey <[email protected]>
   6  *            Yossi Kuperman <[email protected]>
   7  *            Marcelo Ricardo Leitner <[email protected]>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/pkt_cls.h>
  16 #include <linux/ip.h>
  17 #include <linux/ipv6.h>
  18 #include <linux/rhashtable.h>
  19 #include <net/netlink.h>
  20 #include <net/pkt_sched.h>
  21 #include <net/pkt_cls.h>
  22 #include <net/act_api.h>
  23 #include <net/ip.h>
  24 #include <net/ipv6_frag.h>
  25 #include <uapi/linux/tc_act/tc_ct.h>
  26 #include <net/tc_act/tc_ct.h>
  27 #include <net/tc_wrapper.h>
  28
  29 #include <net/netfilter/nf_flow_table.h>
  30 #include <net/netfilter/nf_conntrack.h>
  31 #include <net/netfilter/nf_conntrack_core.h>
  32 #include <net/netfilter/nf_conntrack_zones.h>
  33 #include <net/netfilter/nf_conntrack_helper.h>
  34 #include <net/netfilter/nf_conntrack_acct.h>
  35 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  36 #include <net/netfilter/nf_conntrack_act_ct.h>
  37 #include <net/netfilter/nf_conntrack_seqadj.h>
  38 #include <uapi/linux/netfilter/nf_nat.h>
  39
  40 static struct workqueue_struct *act_ct_wq;
  41 static struct rhashtable zones_ht;
  42 static DEFINE_MUTEX(zones_mutex);
  43
  44 struct tcf_ct_flow_table {
  45         struct rhash_head node; /* In zones tables */
  46
  47         struct rcu_work rwork;
  48         struct nf_flowtable nf_ft;
  49         refcount_t ref;
  50         u16 zone;
  51
  52         bool dying;
  53 };
  54
  55 static const struct rhashtable_params zones_params = {
  56         .head_offset = offsetof(struct tcf_ct_flow_table, node),
  57         .key_offset = offsetof(struct tcf_ct_flow_table, zone),
  58         .key_len = sizeof_field(struct tcf_ct_flow_table, zone),
  59         .automatic_shrinking = true,
  60 };
  61
  62 static struct flow_action_entry *
  63 tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
  64 {
  65         int i = flow_action->num_entries++;
  66
  67         return &flow_action->entries[i];
  68 }
  69
  70 static void tcf_ct_add_mangle_action(struct flow_action *action,
  71                                      enum flow_action_mangle_base htype,
  72                                      u32 offset,
  73                                      u32 mask,
  74                                      u32 val)
  75 {
  76         struct flow_action_entry *entry;
  77
  78         entry = tcf_ct_flow_table_flow_action_get_next(action);
  79         entry->id = FLOW_ACTION_MANGLE;
  80         entry->mangle.htype = htype;
  81         entry->mangle.mask = ~mask;
  82         entry->mangle.offset = offset;
  83         entry->mangle.val = val;
  84 }
  85
  86 /* The following nat helper functions check if the inverted reverse tuple
  87  * (target) is different then the current dir tuple - meaning nat for ports
  88  * and/or ip is needed, and add the relevant mangle actions.
  89  */
  90 static void
  91 tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
  92                                       struct nf_conntrack_tuple target,
  93                                       struct flow_action *action)
  94 {
  95         if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
  96                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
  97                                          offsetof(struct iphdr, saddr),
  98                                          0xFFFFFFFF,
  99                                          be32_to_cpu(target.src.u3.ip));
 100         if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
 101                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
 102                                          offsetof(struct iphdr, daddr),
 103                                          0xFFFFFFFF,
 104                                          be32_to_cpu(target.dst.u3.ip));
 105 }
 106
 107 static void
 108 tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
 109                                    union nf_inet_addr *addr,
 110                                    u32 offset)
 111 {
 112         int i;
 113
 114         for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
 115                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
 116                                          i * sizeof(u32) + offset,
 117                                          0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
 118 }
 119
 120 static void
 121 tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
 122                                       struct nf_conntrack_tuple target,
 123                                       struct flow_action *action)
 124 {
 125         if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
 126                 tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
 127                                                    offsetof(struct ipv6hdr,
 128                                                             saddr));
 129         if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
 130                 tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
 131                                                    offsetof(struct ipv6hdr,
 132                                                             daddr));
 133 }
 134
 135 static void
 136 tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
 137                                      struct nf_conntrack_tuple target,
 138                                      struct flow_action *action)
 139 {
 140         __be16 target_src = target.src.u.tcp.port;
 141         __be16 target_dst = target.dst.u.tcp.port;
 142
 143         if (target_src != tuple->src.u.tcp.port)
 144                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
 145                                          offsetof(struct tcphdr, source),
 146                                          0xFFFF, be16_to_cpu(target_src));
 147         if (target_dst != tuple->dst.u.tcp.port)
 148                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
 149                                          offsetof(struct tcphdr, dest),
 150                                          0xFFFF, be16_to_cpu(target_dst));
 151 }
 152
 153 static void
 154 tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
 155                                      struct nf_conntrack_tuple target,
 156                                      struct flow_action *action)
 157 {
 158         __be16 target_src = target.src.u.udp.port;
 159         __be16 target_dst = target.dst.u.udp.port;
 160
 161         if (target_src != tuple->src.u.udp.port)
 162                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
 163                                          offsetof(struct udphdr, source),
 164                                          0xFFFF, be16_to_cpu(target_src));
 165         if (target_dst != tuple->dst.u.udp.port)
 166                 tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
 167                                          offsetof(struct udphdr, dest),
 168                                          0xFFFF, be16_to_cpu(target_dst));
 169 }
 170
 171 static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
 172                                               enum ip_conntrack_dir dir,
 173                                               enum ip_conntrack_info ctinfo,
 174                                               struct flow_action *action)
 175 {
 176         struct nf_conn_labels *ct_labels;
 177         struct flow_action_entry *entry;
 178         u32 *act_ct_labels;
 179
 180         entry = tcf_ct_flow_table_flow_action_get_next(action);
 181         entry->id = FLOW_ACTION_CT_METADATA;
 182 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 183         entry->ct_metadata.mark = READ_ONCE(ct->mark);
 184 #endif
 185         /* aligns with the CT reference on the SKB nf_ct_set */
 186         entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
 187         entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
 188
 189         act_ct_labels = entry->ct_metadata.labels;
 190         ct_labels = nf_ct_labels_find(ct);
 191         if (ct_labels)
 192                 memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
 193         else
 194                 memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
 195 }
 196
 197 static int tcf_ct_flow_table_add_action_nat(struct net *net,
 198                                             struct nf_conn *ct,
 199                                             enum ip_conntrack_dir dir,
 200                                             struct flow_action *action)
 201 {
 202         const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
 203         struct nf_conntrack_tuple target;
 204
 205         if (!(ct->status & IPS_NAT_MASK))
 206                 return 0;
 207
 208         nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
 209
 210         switch (tuple->src.l3num) {
 211         case NFPROTO_IPV4:
 212                 tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
 213                                                       action);
 214                 break;
 215         case NFPROTO_IPV6:
 216                 tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
 217                                                       action);
 218                 break;
 219         default:
 220                 return -EOPNOTSUPP;
 221         }
 222
 223         switch (nf_ct_protonum(ct)) {
 224         case IPPROTO_TCP:
 225                 tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
 226                 break;
 227         case IPPROTO_UDP:
 228                 tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
 229                 break;
 230         default:
 231                 return -EOPNOTSUPP;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int tcf_ct_flow_table_fill_actions(struct net *net,
 238                                           struct flow_offload *flow,
 239                                           enum flow_offload_tuple_dir tdir,
 240                                           struct nf_flow_rule *flow_rule)
 241 {
 242         struct flow_action *action = &flow_rule->rule->action;
 243         int num_entries = action->num_entries;
 244         struct nf_conn *ct = flow->ct;
 245         enum ip_conntrack_info ctinfo;
 246         enum ip_conntrack_dir dir;
 247         int i, err;
 248
 249         switch (tdir) {
 250         case FLOW_OFFLOAD_DIR_ORIGINAL:
 251                 dir = IP_CT_DIR_ORIGINAL;
 252                 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
 253                         IP_CT_ESTABLISHED : IP_CT_NEW;
 254                 if (ctinfo == IP_CT_ESTABLISHED)
 255                         set_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags);
 256                 break;
 257         case FLOW_OFFLOAD_DIR_REPLY:
 258                 dir = IP_CT_DIR_REPLY;
 259                 ctinfo = IP_CT_ESTABLISHED_REPLY;
 260                 break;
 261         default:
 262                 return -EOPNOTSUPP;
 263         }
 264
 265         err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
 266         if (err)
 267                 goto err_nat;
 268
 269         tcf_ct_flow_table_add_action_meta(ct, dir, ctinfo, action);
 270         return 0;
 271
 272 err_nat:
 273         /* Clear filled actions */
 274         for (i = num_entries; i < action->num_entries; i++)
 275                 memset(&action->entries[i], 0, sizeof(action->entries[i]));
 276         action->num_entries = num_entries;
 277
 278         return err;
 279 }
 280
 281 static struct nf_flowtable_type flowtable_ct = {
 282         .action         = tcf_ct_flow_table_fill_actions,
 283         .owner          = THIS_MODULE,
 284 };
 285
 286 static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
 287 {
 288         struct tcf_ct_flow_table *ct_ft;
 289         int err = -ENOMEM;
 290
 291         mutex_lock(&zones_mutex);
 292         ct_ft = rhashtable_lookup_fast(&zones_ht, &params->zone, zones_params);
 293         if (ct_ft && refcount_inc_not_zero(&ct_ft->ref))
 294                 goto out_unlock;
 295
 296         ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
 297         if (!ct_ft)
 298                 goto err_alloc;
 299         refcount_set(&ct_ft->ref, 1);
 300
 301         ct_ft->zone = params->zone;
 302         err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
 303         if (err)
 304                 goto err_insert;
 305
 306         ct_ft->nf_ft.type = &flowtable_ct;
 307         ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
 308                               NF_FLOWTABLE_COUNTER;
 309         err = nf_flow_table_init(&ct_ft->nf_ft);
 310         if (err)
 311                 goto err_init;
 312         write_pnet(&ct_ft->nf_ft.net, net);
 313
 314         __module_get(THIS_MODULE);
 315 out_unlock:
 316         params->ct_ft = ct_ft;
 317         params->nf_ft = &ct_ft->nf_ft;
 318         mutex_unlock(&zones_mutex);
 319
 320         return 0;
 321
 322 err_init:
 323         rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
 324 err_insert:
 325         kfree(ct_ft);
 326 err_alloc:
 327         mutex_unlock(&zones_mutex);
 328         return err;
 329 }
 330
 331 static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
 332 {
 333         struct flow_block_cb *block_cb, *tmp_cb;
 334         struct tcf_ct_flow_table *ct_ft;
 335         struct flow_block *block;
 336
 337         ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
 338                              rwork);
 339         nf_flow_table_free(&ct_ft->nf_ft);
 340
 341         /* Remove any remaining callbacks before cleanup */
 342         block = &ct_ft->nf_ft.flow_block;
 343         down_write(&ct_ft->nf_ft.flow_block_lock);
 344         list_for_each_entry_safe(block_cb, tmp_cb, &block->cb_list, list) {
 345                 list_del(&block_cb->list);
 346                 flow_block_cb_free(block_cb);
 347         }
 348         up_write(&ct_ft->nf_ft.flow_block_lock);
 349         kfree(ct_ft);
 350
 351         module_put(THIS_MODULE);
 352 }
 353
 354 static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft)
 355 {
 356         if (refcount_dec_and_test(&ct_ft->ref)) {
 357                 rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
 358                 INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
 359                 queue_rcu_work(act_ct_wq, &ct_ft->rwork);
 360         }
 361 }
 362
 363 static void tcf_ct_flow_tc_ifidx(struct flow_offload *entry,
 364                                  struct nf_conn_act_ct_ext *act_ct_ext, u8 dir)
 365 {
 366         entry->tuplehash[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_TC;
 367         entry->tuplehash[dir].tuple.tc.iifidx = act_ct_ext->ifindex[dir];
 368 }
 369
 370 static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
 371                                   struct nf_conn *ct,
 372                                   bool tcp, bool bidirectional)
 373 {
 374         struct nf_conn_act_ct_ext *act_ct_ext;
 375         struct flow_offload *entry;
 376         int err;
 377
 378         if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
 379                 return;
 380
 381         entry = flow_offload_alloc(ct);
 382         if (!entry) {
 383                 WARN_ON_ONCE(1);
 384                 goto err_alloc;
 385         }
 386
 387         if (tcp) {
 388                 ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
 389                 ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
 390         }
 391         if (bidirectional)
 392                 __set_bit(NF_FLOW_HW_BIDIRECTIONAL, &entry->flags);
 393
 394         act_ct_ext = nf_conn_act_ct_ext_find(ct);
 395         if (act_ct_ext) {
 396                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
 397                 tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
 398         }
 399
 400         err = flow_offload_add(&ct_ft->nf_ft, entry);
 401         if (err)
 402                 goto err_add;
 403
 404         return;
 405
 406 err_add:
 407         flow_offload_free(entry);
 408 err_alloc:
 409         clear_bit(IPS_OFFLOAD_BIT, &ct->status);
 410 }
 411
 412 static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
 413                                            struct nf_conn *ct,
 414                                            enum ip_conntrack_info ctinfo)
 415 {
 416         bool tcp = false, bidirectional = true;
 417
 418         switch (nf_ct_protonum(ct)) {
 419         case IPPROTO_TCP:
 420                 if ((ctinfo != IP_CT_ESTABLISHED &&
 421                      ctinfo != IP_CT_ESTABLISHED_REPLY) ||
 422                     !test_bit(IPS_ASSURED_BIT, &ct->status) ||
 423                     ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
 424                         return;
 425
 426                 tcp = true;
 427                 break;
 428         case IPPROTO_UDP:
 429                 if (!nf_ct_is_confirmed(ct))
 430                         return;
 431                 if (!test_bit(IPS_ASSURED_BIT, &ct->status))
 432                         bidirectional = false;
 433                 break;
 434 #ifdef CONFIG_NF_CT_PROTO_GRE
 435         case IPPROTO_GRE: {
 436                 struct nf_conntrack_tuple *tuple;
 437
 438                 if ((ctinfo != IP_CT_ESTABLISHED &&
 439                      ctinfo != IP_CT_ESTABLISHED_REPLY) ||
 440                     !test_bit(IPS_ASSURED_BIT, &ct->status) ||
 441                     ct->status & IPS_NAT_MASK)
 442                         return;
 443
 444                 tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
 445                 /* No support for GRE v1 */
 446                 if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
 447                         return;
 448                 break;
 449         }
 450 #endif
 451         default:
 452                 return;
 453         }
 454
 455         if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
 456             ct->status & IPS_SEQ_ADJUST)
 457                 return;
 458
 459         tcf_ct_flow_table_add(ct_ft, ct, tcp, bidirectional);
 460 }
 461
 462 static bool
 463 tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
 464                                   struct flow_offload_tuple *tuple,
 465                                   struct tcphdr **tcph)
 466 {
 467         struct flow_ports *ports;
 468         unsigned int thoff;
 469         struct iphdr *iph;
 470         size_t hdrsize;
 471         u8 ipproto;
 472
 473         if (!pskb_network_may_pull(skb, sizeof(*iph)))
 474                 return false;
 475
 476         iph = ip_hdr(skb);
 477         thoff = iph->ihl * 4;
 478
 479         if (ip_is_fragment(iph) ||
 480             unlikely(thoff != sizeof(struct iphdr)))
 481                 return false;
 482
 483         ipproto = iph->protocol;
 484         switch (ipproto) {
 485         case IPPROTO_TCP:
 486                 hdrsize = sizeof(struct tcphdr);
 487                 break;
 488         case IPPROTO_UDP:
 489                 hdrsize = sizeof(*ports);
 490                 break;
 491 #ifdef CONFIG_NF_CT_PROTO_GRE
 492         case IPPROTO_GRE:
 493                 hdrsize = sizeof(struct gre_base_hdr);
 494                 break;
 495 #endif
 496         default:
 497                 return false;
 498         }
 499
 500         if (iph->ttl <= 1)
 501                 return false;
 502
 503         if (!pskb_network_may_pull(skb, thoff + hdrsize))
 504                 return false;
 505
 506         switch (ipproto) {
 507         case IPPROTO_TCP:
 508                 *tcph = (void *)(skb_network_header(skb) + thoff);
 509                 fallthrough;
 510         case IPPROTO_UDP:
 511                 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 512                 tuple->src_port = ports->source;
 513                 tuple->dst_port = ports->dest;
 514                 break;
 515         case IPPROTO_GRE: {
 516                 struct gre_base_hdr *greh;
 517
 518                 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
 519                 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
 520                         return false;
 521                 break;
 522         }
 523         }
 524
 525         iph = ip_hdr(skb);
 526
 527         tuple->src_v4.s_addr = iph->saddr;
 528         tuple->dst_v4.s_addr = iph->daddr;
 529         tuple->l3proto = AF_INET;
 530         tuple->l4proto = ipproto;
 531
 532         return true;
 533 }
 534
 535 static bool
 536 tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
 537                                   struct flow_offload_tuple *tuple,
 538                                   struct tcphdr **tcph)
 539 {
 540         struct flow_ports *ports;
 541         struct ipv6hdr *ip6h;
 542         unsigned int thoff;
 543         size_t hdrsize;
 544         u8 nexthdr;
 545
 546         if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
 547                 return false;
 548
 549         ip6h = ipv6_hdr(skb);
 550         thoff = sizeof(*ip6h);
 551
 552         nexthdr = ip6h->nexthdr;
 553         switch (nexthdr) {
 554         case IPPROTO_TCP:
 555                 hdrsize = sizeof(struct tcphdr);
 556                 break;
 557         case IPPROTO_UDP:
 558                 hdrsize = sizeof(*ports);
 559                 break;
 560 #ifdef CONFIG_NF_CT_PROTO_GRE
 561         case IPPROTO_GRE:
 562                 hdrsize = sizeof(struct gre_base_hdr);
 563                 break;
 564 #endif
 565         default:
 566                 return false;
 567         }
 568
 569         if (ip6h->hop_limit <= 1)
 570                 return false;
 571
 572         if (!pskb_network_may_pull(skb, thoff + hdrsize))
 573                 return false;
 574
 575         switch (nexthdr) {
 576         case IPPROTO_TCP:
 577                 *tcph = (void *)(skb_network_header(skb) + thoff);
 578                 fallthrough;
 579         case IPPROTO_UDP:
 580                 ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 581                 tuple->src_port = ports->source;
 582                 tuple->dst_port = ports->dest;
 583                 break;
 584         case IPPROTO_GRE: {
 585                 struct gre_base_hdr *greh;
 586
 587                 greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
 588                 if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
 589                         return false;
 590                 break;
 591         }
 592         }
 593
 594         ip6h = ipv6_hdr(skb);
 595
 596         tuple->src_v6 = ip6h->saddr;
 597         tuple->dst_v6 = ip6h->daddr;
 598         tuple->l3proto = AF_INET6;
 599         tuple->l4proto = nexthdr;
 600
 601         return true;
 602 }
 603
 604 static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
 605                                      struct sk_buff *skb,
 606                                      u8 family)
 607 {
 608         struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
 609         struct flow_offload_tuple_rhash *tuplehash;
 610         struct flow_offload_tuple tuple = {};
 611         enum ip_conntrack_info ctinfo;
 612         struct tcphdr *tcph = NULL;
 613         bool force_refresh = false;
 614         struct flow_offload *flow;
 615         struct nf_conn *ct;
 616         u8 dir;
 617
 618         switch (family) {
 619         case NFPROTO_IPV4:
 620                 if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
 621                         return false;
 622                 break;
 623         case NFPROTO_IPV6:
 624                 if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
 625                         return false;
 626                 break;
 627         default:
 628                 return false;
 629         }
 630
 631         tuplehash = flow_offload_lookup(nf_ft, &tuple);
 632         if (!tuplehash)
 633                 return false;
 634
 635         dir = tuplehash->tuple.dir;
 636         flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
 637         ct = flow->ct;
 638
 639         if (dir == FLOW_OFFLOAD_DIR_REPLY &&
 640             !test_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags)) {
 641                 /* Only offload reply direction after connection became
 642                  * assured.
 643                  */
 644                 if (test_bit(IPS_ASSURED_BIT, &ct->status))
 645                         set_bit(NF_FLOW_HW_BIDIRECTIONAL, &flow->flags);
 646                 else if (test_bit(NF_FLOW_HW_ESTABLISHED, &flow->flags))
 647                         /* If flow_table flow has already been updated to the
 648                          * established state, then don't refresh.
 649                          */
 650                         return false;
 651                 force_refresh = true;
 652         }
 653
 654         if (tcph && (unlikely(tcph->fin || tcph->rst))) {
 655                 flow_offload_teardown(flow);
 656                 return false;
 657         }
 658
 659         if (dir == FLOW_OFFLOAD_DIR_ORIGINAL)
 660                 ctinfo = test_bit(IPS_SEEN_REPLY_BIT, &ct->status) ?
 661                         IP_CT_ESTABLISHED : IP_CT_NEW;
 662         else
 663                 ctinfo = IP_CT_ESTABLISHED_REPLY;
 664
 665         flow_offload_refresh(nf_ft, flow, force_refresh);
 666         if (!test_bit(IPS_ASSURED_BIT, &ct->status)) {
 667                 /* Process this flow in SW to allow promoting to ASSURED */
 668                 return false;
 669         }
 670
 671         nf_conntrack_get(&ct->ct_general);
 672         nf_ct_set(skb, ct, ctinfo);
 673         if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
 674                 nf_ct_acct_update(ct, dir, skb->len);
 675
 676         return true;
 677 }
 678
 679 static int tcf_ct_flow_tables_init(void)
 680 {
 681         return rhashtable_init(&zones_ht, &zones_params);
 682 }
 683
 684 static void tcf_ct_flow_tables_uninit(void)
 685 {
 686         rhashtable_destroy(&zones_ht);
 687 }
 688
 689 static struct tc_action_ops act_ct_ops;
 690
 691 struct tc_ct_action_net {
 692         struct tc_action_net tn; /* Must be first */
 693         bool labels;
 694 };
 695
 696 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
 697 static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
 698                                    struct tcf_ct_params *p)
 699 {
 700         enum ip_conntrack_info ctinfo;
 701         struct nf_conn *ct;
 702
 703         ct = nf_ct_get(skb, &ctinfo);
 704         if (!ct)
 705                 return false;
 706         if (!net_eq(net, read_pnet(&ct->ct_net)))
 707                 goto drop_ct;
 708         if (nf_ct_zone(ct)->id != p->zone)
 709                 goto drop_ct;
 710         if (p->helper) {
 711                 struct nf_conn_help *help;
 712
 713                 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
 714                 if (help && rcu_access_pointer(help->helper) != p->helper)
 715                         goto drop_ct;
 716         }
 717
 718         /* Force conntrack entry direction. */
 719         if ((p->ct_action & TCA_CT_ACT_FORCE) &&
 720             CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
 721                 if (nf_ct_is_confirmed(ct))
 722                         nf_ct_kill(ct);
 723
 724                 goto drop_ct;
 725         }
 726
 727         return true;
 728
 729 drop_ct:
 730         nf_ct_put(ct);
 731         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 732
 733         return false;
 734 }
 735
 736 static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
 737 {
 738         u8 family = NFPROTO_UNSPEC;
 739
 740         switch (skb_protocol(skb, true)) {
 741         case htons(ETH_P_IP):
 742                 family = NFPROTO_IPV4;
 743                 break;
 744         case htons(ETH_P_IPV6):
 745                 family = NFPROTO_IPV6;
 746                 break;
 747         default:
 748                 break;
 749         }
 750
 751         return family;
 752 }
 753
 754 static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
 755 {
 756         unsigned int len;
 757
 758         len =  skb_network_offset(skb) + sizeof(struct iphdr);
 759         if (unlikely(skb->len < len))
 760                 return -EINVAL;
 761         if (unlikely(!pskb_may_pull(skb, len)))
 762                 return -ENOMEM;
 763
 764         *frag = ip_is_fragment(ip_hdr(skb));
 765         return 0;
 766 }
 767
 768 static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
 769 {
 770         unsigned int flags = 0, len, payload_ofs = 0;
 771         unsigned short frag_off;
 772         int nexthdr;
 773
 774         len =  skb_network_offset(skb) + sizeof(struct ipv6hdr);
 775         if (unlikely(skb->len < len))
 776                 return -EINVAL;
 777         if (unlikely(!pskb_may_pull(skb, len)))
 778                 return -ENOMEM;
 779
 780         nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
 781         if (unlikely(nexthdr < 0))
 782                 return -EPROTO;
 783
 784         *frag = flags & IP6_FH_F_FRAG;
 785         return 0;
 786 }
 787
 788 static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
 789                                    u8 family, u16 zone, bool *defrag)
 790 {
 791         enum ip_conntrack_info ctinfo;
 792         struct nf_conn *ct;
 793         int err = 0;
 794         bool frag;
 795         u8 proto;
 796         u16 mru;
 797
 798         /* Previously seen (loopback)? Ignore. */
 799         ct = nf_ct_get(skb, &ctinfo);
 800         if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
 801                 return 0;
 802
 803         if (family == NFPROTO_IPV4)
 804                 err = tcf_ct_ipv4_is_fragment(skb, &frag);
 805         else
 806                 err = tcf_ct_ipv6_is_fragment(skb, &frag);
 807         if (err || !frag)
 808                 return err;
 809
 810         skb_get(skb);
 811         err = nf_ct_handle_fragments(net, skb, zone, family, &proto, &mru);
 812         if (err)
 813                 return err;
 814
 815         *defrag = true;
 816         tc_skb_cb(skb)->mru = mru;
 817
 818         return 0;
 819 }
 820
 821 static void tcf_ct_params_free(struct tcf_ct_params *params)
 822 {
 823         if (params->helper) {
 824 #if IS_ENABLED(CONFIG_NF_NAT)
 825                 if (params->ct_action & TCA_CT_ACT_NAT)
 826                         nf_nat_helper_put(params->helper);
 827 #endif
 828                 nf_conntrack_helper_put(params->helper);
 829         }
 830         if (params->ct_ft)
 831                 tcf_ct_flow_table_put(params->ct_ft);
 832         if (params->tmpl)
 833                 nf_ct_put(params->tmpl);
 834         kfree(params);
 835 }
 836
 837 static void tcf_ct_params_free_rcu(struct rcu_head *head)
 838 {
 839         struct tcf_ct_params *params;
 840
 841         params = container_of(head, struct tcf_ct_params, rcu);
 842         tcf_ct_params_free(params);
 843 }
 844
 845 static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
 846 {
 847 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
 848         u32 new_mark;
 849
 850         if (!mask)
 851                 return;
 852
 853         new_mark = mark | (READ_ONCE(ct->mark) & ~(mask));
 854         if (READ_ONCE(ct->mark) != new_mark) {
 855                 WRITE_ONCE(ct->mark, new_mark);
 856                 if (nf_ct_is_confirmed(ct))
 857                         nf_conntrack_event_cache(IPCT_MARK, ct);
 858         }
 859 #endif
 860 }
 861
 862 static void tcf_ct_act_set_labels(struct nf_conn *ct,
 863                                   u32 *labels,
 864                                   u32 *labels_m)
 865 {
 866 #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
 867         size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
 868
 869         if (!memchr_inv(labels_m, 0, labels_sz))
 870                 return;
 871
 872         nf_connlabels_replace(ct, labels, labels_m, 4);
 873 #endif
 874 }
 875
 876 static int tcf_ct_act_nat(struct sk_buff *skb,
 877                           struct nf_conn *ct,
 878                           enum ip_conntrack_info ctinfo,
 879                           int ct_action,
 880                           struct nf_nat_range2 *range,
 881                           bool commit)
 882 {
 883 #if IS_ENABLED(CONFIG_NF_NAT)
 884         int err, action = 0;
 885
 886         if (!(ct_action & TCA_CT_ACT_NAT))
 887                 return NF_ACCEPT;
 888         if (ct_action & TCA_CT_ACT_NAT_SRC)
 889                 action |= BIT(NF_NAT_MANIP_SRC);
 890         if (ct_action & TCA_CT_ACT_NAT_DST)
 891                 action |= BIT(NF_NAT_MANIP_DST);
 892
 893         err = nf_ct_nat(skb, ct, ctinfo, &action, range, commit);
 894
 895         if (action & BIT(NF_NAT_MANIP_SRC))
 896                 tc_skb_cb(skb)->post_ct_snat = 1;
 897         if (action & BIT(NF_NAT_MANIP_DST))
 898                 tc_skb_cb(skb)->post_ct_dnat = 1;
 899
 900         return err;
 901 #else
 902         return NF_ACCEPT;
 903 #endif
 904 }
 905
 906 TC_INDIRECT_SCOPE int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
 907                                  struct tcf_result *res)
 908 {
 909         struct net *net = dev_net(skb->dev);
 910         enum ip_conntrack_info ctinfo;
 911         struct tcf_ct *c = to_ct(a);
 912         struct nf_conn *tmpl = NULL;
 913         struct nf_hook_state state;
 914         bool cached, commit, clear;
 915         int nh_ofs, err, retval;
 916         struct tcf_ct_params *p;
 917         bool add_helper = false;
 918         bool skip_add = false;
 919         bool defrag = false;
 920         struct nf_conn *ct;
 921         u8 family;
 922
 923         p = rcu_dereference_bh(c->params);
 924
 925         retval = READ_ONCE(c->tcf_action);
 926         commit = p->ct_action & TCA_CT_ACT_COMMIT;
 927         clear = p->ct_action & TCA_CT_ACT_CLEAR;
 928         tmpl = p->tmpl;
 929
 930         tcf_lastuse_update(&c->tcf_tm);
 931         tcf_action_update_bstats(&c->common, skb);
 932
 933         if (clear) {
 934                 tc_skb_cb(skb)->post_ct = false;
 935                 ct = nf_ct_get(skb, &ctinfo);
 936                 if (ct) {
 937                         nf_ct_put(ct);
 938                         nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 939                 }
 940
 941                 goto out_clear;
 942         }
 943
 944         family = tcf_ct_skb_nf_family(skb);
 945         if (family == NFPROTO_UNSPEC)
 946                 goto drop;
 947
 948         /* The conntrack module expects to be working at L3.
 949          * We also try to pull the IPv4/6 header to linear area
 950          */
 951         nh_ofs = skb_network_offset(skb);
 952         skb_pull_rcsum(skb, nh_ofs);
 953         err = tcf_ct_handle_fragments(net, skb, family, p->zone, &defrag);
 954         if (err == -EINPROGRESS) {
 955                 retval = TC_ACT_STOLEN;
 956                 goto out_clear;
 957         }
 958         if (err)
 959                 goto drop;
 960
 961         err = nf_ct_skb_network_trim(skb, family);
 962         if (err)
 963                 goto drop;
 964
 965         /* If we are recirculating packets to match on ct fields and
 966          * committing with a separate ct action, then we don't need to
 967          * actually run the packet through conntrack twice unless it's for a
 968          * different zone.
 969          */
 970         cached = tcf_ct_skb_nfct_cached(net, skb, p);
 971         if (!cached) {
 972                 if (tcf_ct_flow_table_lookup(p, skb, family)) {
 973                         skip_add = true;
 974                         goto do_nat;
 975                 }
 976
 977                 /* Associate skb with specified zone. */
 978                 if (tmpl) {
 979                         nf_conntrack_put(skb_nfct(skb));
 980                         nf_conntrack_get(&tmpl->ct_general);
 981                         nf_ct_set(skb, tmpl, IP_CT_NEW);
 982                 }
 983
 984                 state.hook = NF_INET_PRE_ROUTING;
 985                 state.net = net;
 986                 state.pf = family;
 987                 err = nf_conntrack_in(skb, &state);
 988                 if (err != NF_ACCEPT)
 989                         goto out_push;
 990         }
 991
 992 do_nat:
 993         ct = nf_ct_get(skb, &ctinfo);
 994         if (!ct)
 995                 goto out_push;
 996         nf_ct_deliver_cached_events(ct);
 997         nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
 998
 999         err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
1000         if (err != NF_ACCEPT)
1001                 goto drop;
1002
1003         if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
1004                 err = __nf_ct_try_assign_helper(ct, p->tmpl, GFP_ATOMIC);
1005                 if (err)
1006                         goto drop;
1007                 add_helper = true;
1008                 if (p->ct_action & TCA_CT_ACT_NAT && !nfct_seqadj(ct)) {
1009                         if (!nfct_seqadj_ext_add(ct))
1010                                 goto drop;
1011                 }
1012         }
1013
1014         if (nf_ct_is_confirmed(ct) ? ((!cached && !skip_add) || add_helper) : commit) {
1015                 if (nf_ct_helper(skb, ct, ctinfo, family) != NF_ACCEPT)
1016                         goto drop;
1017         }
1018
1019         if (commit) {
1020                 tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
1021                 tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
1022
1023                 if (!nf_ct_is_confirmed(ct))
1024                         nf_conn_act_ct_ext_add(ct);
1025
1026                 /* This will take care of sending queued events
1027                  * even if the connection is already confirmed.
1028                  */
1029                 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1030                         goto drop;
1031         }
1032
1033         if (!skip_add)
1034                 tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
1035
1036 out_push:
1037         skb_push_rcsum(skb, nh_ofs);
1038
1039         tc_skb_cb(skb)->post_ct = true;
1040         tc_skb_cb(skb)->zone = p->zone;
1041 out_clear:
1042         if (defrag)
1043                 qdisc_skb_cb(skb)->pkt_len = skb->len;
1044         return retval;
1045
1046 drop:
1047         tcf_action_inc_drop_qstats(&c->common);
1048         return TC_ACT_SHOT;
1049 }
1050
1051 static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
1052         [TCA_CT_ACTION] = { .type = NLA_U16 },
1053         [TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)),
1054         [TCA_CT_ZONE] = { .type = NLA_U16 },
1055         [TCA_CT_MARK] = { .type = NLA_U32 },
1056         [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
1057         [TCA_CT_LABELS] = { .type = NLA_BINARY,
1058                             .len = 128 / BITS_PER_BYTE },
1059         [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
1060                                  .len = 128 / BITS_PER_BYTE },
1061         [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
1062         [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
1063         [TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1064         [TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1065         [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
1066         [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
1067         [TCA_CT_HELPER_NAME] = { .type = NLA_STRING, .len = NF_CT_HELPER_NAME_LEN },
1068         [TCA_CT_HELPER_FAMILY] = { .type = NLA_U8 },
1069         [TCA_CT_HELPER_PROTO] = { .type = NLA_U8 },
1070 };
1071
1072 static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
1073                                   struct tc_ct *parm,
1074                                   struct nlattr **tb,
1075                                   struct netlink_ext_ack *extack)
1076 {
1077         struct nf_nat_range2 *range;
1078
1079         if (!(p->ct_action & TCA_CT_ACT_NAT))
1080                 return 0;
1081
1082         if (!IS_ENABLED(CONFIG_NF_NAT)) {
1083                 NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
1084                 return -EOPNOTSUPP;
1085         }
1086
1087         if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1088                 return 0;
1089
1090         if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
1091             (p->ct_action & TCA_CT_ACT_NAT_DST)) {
1092                 NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
1093                 return -EOPNOTSUPP;
1094         }
1095
1096         range = &p->range;
1097         if (tb[TCA_CT_NAT_IPV4_MIN]) {
1098                 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
1099
1100                 p->ipv4_range = true;
1101                 range->flags |= NF_NAT_RANGE_MAP_IPS;
1102                 range->min_addr.ip =
1103                         nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
1104
1105                 range->max_addr.ip = max_attr ?
1106                                      nla_get_in_addr(max_attr) :
1107                                      range->min_addr.ip;
1108         } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
1109                 struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
1110
1111                 p->ipv4_range = false;
1112                 range->flags |= NF_NAT_RANGE_MAP_IPS;
1113                 range->min_addr.in6 =
1114                         nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
1115
1116                 range->max_addr.in6 = max_attr ?
1117                                       nla_get_in6_addr(max_attr) :
1118                                       range->min_addr.in6;
1119         }
1120
1121         if (tb[TCA_CT_NAT_PORT_MIN]) {
1122                 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1123                 range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
1124
1125                 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
1126                                        nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
1127                                        range->min_proto.all;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static void tcf_ct_set_key_val(struct nlattr **tb,
1134                                void *val, int val_type,
1135                                void *mask, int mask_type,
1136                                int len)
1137 {
1138         if (!tb[val_type])
1139                 return;
1140         nla_memcpy(val, tb[val_type], len);
1141
1142         if (!mask)
1143                 return;
1144
1145         if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
1146                 memset(mask, 0xff, len);
1147         else
1148                 nla_memcpy(mask, tb[mask_type], len);
1149 }
1150
1151 static int tcf_ct_fill_params(struct net *net,
1152                               struct tcf_ct_params *p,
1153                               struct tc_ct *parm,
1154                               struct nlattr **tb,
1155                               struct netlink_ext_ack *extack)
1156 {
1157         struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
1158         struct nf_conntrack_zone zone;
1159         int err, family, proto, len;
1160         struct nf_conn *tmpl;
1161         char *name;
1162
1163         p->zone = NF_CT_DEFAULT_ZONE_ID;
1164
1165         tcf_ct_set_key_val(tb,
1166                            &p->ct_action, TCA_CT_ACTION,
1167                            NULL, TCA_CT_UNSPEC,
1168                            sizeof(p->ct_action));
1169
1170         if (p->ct_action & TCA_CT_ACT_CLEAR)
1171                 return 0;
1172
1173         err = tcf_ct_fill_params_nat(p, parm, tb, extack);
1174         if (err)
1175                 return err;
1176
1177         if (tb[TCA_CT_MARK]) {
1178                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
1179                         NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
1180                         return -EOPNOTSUPP;
1181                 }
1182                 tcf_ct_set_key_val(tb,
1183                                    &p->mark, TCA_CT_MARK,
1184                                    &p->mark_mask, TCA_CT_MARK_MASK,
1185                                    sizeof(p->mark));
1186         }
1187
1188         if (tb[TCA_CT_LABELS]) {
1189                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
1190                         NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
1191                         return -EOPNOTSUPP;
1192                 }
1193
1194                 if (!tn->labels) {
1195                         NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
1196                         return -EOPNOTSUPP;
1197                 }
1198                 tcf_ct_set_key_val(tb,
1199                                    p->labels, TCA_CT_LABELS,
1200                                    p->labels_mask, TCA_CT_LABELS_MASK,
1201                                    sizeof(p->labels));
1202         }
1203
1204         if (tb[TCA_CT_ZONE]) {
1205                 if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
1206                         NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
1207                         return -EOPNOTSUPP;
1208                 }
1209
1210                 tcf_ct_set_key_val(tb,
1211                                    &p->zone, TCA_CT_ZONE,
1212                                    NULL, TCA_CT_UNSPEC,
1213                                    sizeof(p->zone));
1214         }
1215
1216         nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
1217         tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
1218         if (!tmpl) {
1219                 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
1220                 return -ENOMEM;
1221         }
1222         p->tmpl = tmpl;
1223         if (tb[TCA_CT_HELPER_NAME]) {
1224                 name = nla_data(tb[TCA_CT_HELPER_NAME]);
1225                 len = nla_len(tb[TCA_CT_HELPER_NAME]);
1226                 if (len > 16 || name[len - 1] != '\0') {
1227                         NL_SET_ERR_MSG_MOD(extack, "Failed to parse helper name.");
1228                         err = -EINVAL;
1229                         goto err;
1230                 }
1231                 family = tb[TCA_CT_HELPER_FAMILY] ? nla_get_u8(tb[TCA_CT_HELPER_FAMILY]) : AF_INET;
1232                 proto = tb[TCA_CT_HELPER_PROTO] ? nla_get_u8(tb[TCA_CT_HELPER_PROTO]) : IPPROTO_TCP;
1233                 err = nf_ct_add_helper(tmpl, name, family, proto,
1234                                        p->ct_action & TCA_CT_ACT_NAT, &p->helper);
1235                 if (err) {
1236                         NL_SET_ERR_MSG_MOD(extack, "Failed to add helper");
1237                         goto err;
1238                 }
1239         }
1240
1241         if (p->ct_action & TCA_CT_ACT_COMMIT)
1242                 __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
1243         return 0;
1244 err:
1245         nf_ct_put(p->tmpl);
1246         p->tmpl = NULL;
1247         return err;
1248 }
1249
1250 static int tcf_ct_init(struct net *net, struct nlattr *nla,
1251                        struct nlattr *est, struct tc_action **a,
1252                        struct tcf_proto *tp, u32 flags,
1253                        struct netlink_ext_ack *extack)
1254 {
1255         struct tc_action_net *tn = net_generic(net, act_ct_ops.net_id);
1256         bool bind = flags & TCA_ACT_FLAGS_BIND;
1257         struct tcf_ct_params *params = NULL;
1258         struct nlattr *tb[TCA_CT_MAX + 1];
1259         struct tcf_chain *goto_ch = NULL;
1260         struct tc_ct *parm;
1261         struct tcf_ct *c;
1262         int err, res = 0;
1263         u32 index;
1264
1265         if (!nla) {
1266                 NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
1267                 return -EINVAL;
1268         }
1269
1270         err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
1271         if (err < 0)
1272                 return err;
1273
1274         if (!tb[TCA_CT_PARMS]) {
1275                 NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
1276                 return -EINVAL;
1277         }
1278         parm = nla_data(tb[TCA_CT_PARMS]);
1279         index = parm->index;
1280         err = tcf_idr_check_alloc(tn, &index, a, bind);
1281         if (err < 0)
1282                 return err;
1283
1284         if (!err) {
1285                 err = tcf_idr_create_from_flags(tn, index, est, a,
1286                                                 &act_ct_ops, bind, flags);
1287                 if (err) {
1288                         tcf_idr_cleanup(tn, index);
1289                         return err;
1290                 }
1291                 res = ACT_P_CREATED;
1292         } else {
1293                 if (bind)
1294                         return 0;
1295
1296                 if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
1297                         tcf_idr_release(*a, bind);
1298                         return -EEXIST;
1299                 }
1300         }
1301         err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
1302         if (err < 0)
1303                 goto cleanup;
1304
1305         c = to_ct(*a);
1306
1307         params = kzalloc(sizeof(*params), GFP_KERNEL);
1308         if (unlikely(!params)) {
1309                 err = -ENOMEM;
1310                 goto cleanup;
1311         }
1312
1313         err = tcf_ct_fill_params(net, params, parm, tb, extack);
1314         if (err)
1315                 goto cleanup;
1316
1317         err = tcf_ct_flow_table_get(net, params);
1318         if (err)
1319                 goto cleanup;
1320
1321         spin_lock_bh(&c->tcf_lock);
1322         goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
1323         params = rcu_replace_pointer(c->params, params,
1324                                      lockdep_is_held(&c->tcf_lock));
1325         spin_unlock_bh(&c->tcf_lock);
1326
1327         if (goto_ch)
1328                 tcf_chain_put_by_act(goto_ch);
1329         if (params)
1330                 call_rcu(&params->rcu, tcf_ct_params_free_rcu);
1331
1332         return res;
1333
1334 cleanup:
1335         if (goto_ch)
1336                 tcf_chain_put_by_act(goto_ch);
1337         if (params)
1338                 tcf_ct_params_free(params);
1339         tcf_idr_release(*a, bind);
1340         return err;
1341 }
1342
1343 static void tcf_ct_cleanup(struct tc_action *a)
1344 {
1345         struct tcf_ct_params *params;
1346         struct tcf_ct *c = to_ct(a);
1347
1348         params = rcu_dereference_protected(c->params, 1);
1349         if (params)
1350                 call_rcu(&params->rcu, tcf_ct_params_free_rcu);
1351 }
1352
1353 static int tcf_ct_dump_key_val(struct sk_buff *skb,
1354                                void *val, int val_type,
1355                                void *mask, int mask_type,
1356                                int len)
1357 {
1358         int err;
1359
1360         if (mask && !memchr_inv(mask, 0, len))
1361                 return 0;
1362
1363         err = nla_put(skb, val_type, len, val);
1364         if (err)
1365                 return err;
1366
1367         if (mask_type != TCA_CT_UNSPEC) {
1368                 err = nla_put(skb, mask_type, len, mask);
1369                 if (err)
1370                         return err;
1371         }
1372
1373         return 0;
1374 }
1375
1376 static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
1377 {
1378         struct nf_nat_range2 *range = &p->range;
1379
1380         if (!(p->ct_action & TCA_CT_ACT_NAT))
1381                 return 0;
1382
1383         if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
1384                 return 0;
1385
1386         if (range->flags & NF_NAT_RANGE_MAP_IPS) {
1387                 if (p->ipv4_range) {
1388                         if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
1389                                             range->min_addr.ip))
1390                                 return -1;
1391                         if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
1392                                             range->max_addr.ip))
1393                                 return -1;
1394                 } else {
1395                         if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
1396                                              &range->min_addr.in6))
1397                                 return -1;
1398                         if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
1399                                              &range->max_addr.in6))
1400                                 return -1;
1401                 }
1402         }
1403
1404         if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
1405                 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
1406                                  range->min_proto.all))
1407                         return -1;
1408                 if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
1409                                  range->max_proto.all))
1410                         return -1;
1411         }
1412
1413         return 0;
1414 }
1415
1416 static int tcf_ct_dump_helper(struct sk_buff *skb, struct nf_conntrack_helper *helper)
1417 {
1418         if (!helper)
1419                 return 0;
1420
1421         if (nla_put_string(skb, TCA_CT_HELPER_NAME, helper->name) ||
1422             nla_put_u8(skb, TCA_CT_HELPER_FAMILY, helper->tuple.src.l3num) ||
1423             nla_put_u8(skb, TCA_CT_HELPER_PROTO, helper->tuple.dst.protonum))
1424                 return -1;
1425
1426         return 0;
1427 }
1428
1429 static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
1430                               int bind, int ref)
1431 {
1432         unsigned char *b = skb_tail_pointer(skb);
1433         struct tcf_ct *c = to_ct(a);
1434         struct tcf_ct_params *p;
1435
1436         struct tc_ct opt = {
1437                 .index   = c->tcf_index,
1438                 .refcnt  = refcount_read(&c->tcf_refcnt) - ref,
1439                 .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
1440         };
1441         struct tcf_t t;
1442
1443         spin_lock_bh(&c->tcf_lock);
1444         p = rcu_dereference_protected(c->params,
1445                                       lockdep_is_held(&c->tcf_lock));
1446         opt.action = c->tcf_action;
1447
1448         if (tcf_ct_dump_key_val(skb,
1449                                 &p->ct_action, TCA_CT_ACTION,
1450                                 NULL, TCA_CT_UNSPEC,
1451                                 sizeof(p->ct_action)))
1452                 goto nla_put_failure;
1453
1454         if (p->ct_action & TCA_CT_ACT_CLEAR)
1455                 goto skip_dump;
1456
1457         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1458             tcf_ct_dump_key_val(skb,
1459                                 &p->mark, TCA_CT_MARK,
1460                                 &p->mark_mask, TCA_CT_MARK_MASK,
1461                                 sizeof(p->mark)))
1462                 goto nla_put_failure;
1463
1464         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1465             tcf_ct_dump_key_val(skb,
1466                                 p->labels, TCA_CT_LABELS,
1467                                 p->labels_mask, TCA_CT_LABELS_MASK,
1468                                 sizeof(p->labels)))
1469                 goto nla_put_failure;
1470
1471         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1472             tcf_ct_dump_key_val(skb,
1473                                 &p->zone, TCA_CT_ZONE,
1474                                 NULL, TCA_CT_UNSPEC,
1475                                 sizeof(p->zone)))
1476                 goto nla_put_failure;
1477
1478         if (tcf_ct_dump_nat(skb, p))
1479                 goto nla_put_failure;
1480
1481         if (tcf_ct_dump_helper(skb, p->helper))
1482                 goto nla_put_failure;
1483
1484 skip_dump:
1485         if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
1486                 goto nla_put_failure;
1487
1488         tcf_tm_dump(&t, &c->tcf_tm);
1489         if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
1490                 goto nla_put_failure;
1491         spin_unlock_bh(&c->tcf_lock);
1492
1493         return skb->len;
1494 nla_put_failure:
1495         spin_unlock_bh(&c->tcf_lock);
1496         nlmsg_trim(skb, b);
1497         return -1;
1498 }
1499
1500 static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
1501                              u64 drops, u64 lastuse, bool hw)
1502 {
1503         struct tcf_ct *c = to_ct(a);
1504
1505         tcf_action_update_stats(a, bytes, packets, drops, hw);
1506         c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
1507 }
1508
1509 static int tcf_ct_offload_act_setup(struct tc_action *act, void *entry_data,
1510                                     u32 *index_inc, bool bind,
1511                                     struct netlink_ext_ack *extack)
1512 {
1513         if (bind) {
1514                 struct flow_action_entry *entry = entry_data;
1515
1516                 entry->id = FLOW_ACTION_CT;
1517                 entry->ct.action = tcf_ct_action(act);
1518                 entry->ct.zone = tcf_ct_zone(act);
1519                 entry->ct.flow_table = tcf_ct_ft(act);
1520                 *index_inc = 1;
1521         } else {
1522                 struct flow_offload_action *fl_action = entry_data;
1523
1524                 fl_action->id = FLOW_ACTION_CT;
1525         }
1526
1527         return 0;
1528 }
1529
1530 static struct tc_action_ops act_ct_ops = {
1531         .kind           =       "ct",
1532         .id             =       TCA_ID_CT,
1533         .owner          =       THIS_MODULE,
1534         .act            =       tcf_ct_act,
1535         .dump           =       tcf_ct_dump,
1536         .init           =       tcf_ct_init,
1537         .cleanup        =       tcf_ct_cleanup,
1538         .stats_update   =       tcf_stats_update,
1539         .offload_act_setup =    tcf_ct_offload_act_setup,
1540         .size           =       sizeof(struct tcf_ct),
1541 };
1542
1543 static __net_init int ct_init_net(struct net *net)
1544 {
1545         unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
1546         struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
1547
1548         if (nf_connlabels_get(net, n_bits - 1)) {
1549                 tn->labels = false;
1550                 pr_err("act_ct: Failed to set connlabels length");
1551         } else {
1552                 tn->labels = true;
1553         }
1554
1555         return tc_action_net_init(net, &tn->tn, &act_ct_ops);
1556 }
1557
1558 static void __net_exit ct_exit_net(struct list_head *net_list)
1559 {
1560         struct net *net;
1561
1562         rtnl_lock();
1563         list_for_each_entry(net, net_list, exit_list) {
1564                 struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
1565
1566                 if (tn->labels)
1567                         nf_connlabels_put(net);
1568         }
1569         rtnl_unlock();
1570
1571         tc_action_net_exit(net_list, act_ct_ops.net_id);
1572 }
1573
1574 static struct pernet_operations ct_net_ops = {
1575         .init = ct_init_net,
1576         .exit_batch = ct_exit_net,
1577         .id   = &act_ct_ops.net_id,
1578         .size = sizeof(struct tc_ct_action_net),
1579 };
1580
1581 static int __init ct_init_module(void)
1582 {
1583         int err;
1584
1585         act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
1586         if (!act_ct_wq)
1587                 return -ENOMEM;
1588
1589         err = tcf_ct_flow_tables_init();
1590         if (err)
1591                 goto err_tbl_init;
1592
1593         err = tcf_register_action(&act_ct_ops, &ct_net_ops);
1594         if (err)
1595                 goto err_register;
1596
1597         static_branch_inc(&tcf_frag_xmit_count);
1598
1599         return 0;
1600
1601 err_register:
1602         tcf_ct_flow_tables_uninit();
1603 err_tbl_init:
1604         destroy_workqueue(act_ct_wq);
1605         return err;
1606 }
1607
1608 static void __exit ct_cleanup_module(void)
1609 {
1610         static_branch_dec(&tcf_frag_xmit_count);
1611         tcf_unregister_action(&act_ct_ops, &ct_net_ops);
1612         tcf_ct_flow_tables_uninit();
1613         destroy_workqueue(act_ct_wq);
1614 }
1615
1616 module_init(ct_init_module);
1617 module_exit(ct_cleanup_module);
1618 MODULE_AUTHOR("Paul Blakey <[email protected]>");
1619 MODULE_AUTHOR("Yossi Kuperman <[email protected]>");
1620 MODULE_AUTHOR("Marcelo Ricardo Leitner <[email protected]>");
1621 MODULE_DESCRIPTION("Connection tracking action");
1622 MODULE_LICENSE("GPL v2");