net/sched/act_api.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/sched/act_api.c  Packet action API.
   4  *
   5  * Author:      Jamal Hadi Salim
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/init.h>
  15 #include <linux/kmod.h>
  16 #include <linux/err.h>
  17 #include <linux/module.h>
  18 #include <net/net_namespace.h>
  19 #include <net/sock.h>
  20 #include <net/sch_generic.h>
  21 #include <net/pkt_cls.h>
  22 #include <net/tc_act/tc_pedit.h>
  23 #include <net/act_api.h>
  24 #include <net/netlink.h>
  25 #include <net/flow_offload.h>
  26
  27 #ifdef CONFIG_INET
  28 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
  29 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
  30 #endif
  31
  32 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
  33 {
  34 #ifdef CONFIG_INET
  35         if (static_branch_unlikely(&tcf_frag_xmit_count))
  36                 return sch_frag_xmit_hook(skb, xmit);
  37 #endif
  38
  39         return xmit(skb);
  40 }
  41 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
  42
  43 static void tcf_action_goto_chain_exec(const struct tc_action *a,
  44                                        struct tcf_result *res)
  45 {
  46         const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
  47
  48         res->goto_tp = rcu_dereference_bh(chain->filter_chain);
  49 }
  50
  51 static void tcf_free_cookie_rcu(struct rcu_head *p)
  52 {
  53         struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
  54
  55         kfree(cookie->data);
  56         kfree(cookie);
  57 }
  58
  59 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
  60                                   struct tc_cookie *new_cookie)
  61 {
  62         struct tc_cookie *old;
  63
  64         old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
  65         if (old)
  66                 call_rcu(&old->rcu, tcf_free_cookie_rcu);
  67 }
  68
  69 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
  70                              struct tcf_chain **newchain,
  71                              struct netlink_ext_ack *extack)
  72 {
  73         int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
  74         u32 chain_index;
  75
  76         if (!opcode)
  77                 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
  78         else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
  79                 ret = 0;
  80         if (ret) {
  81                 NL_SET_ERR_MSG(extack, "invalid control action");
  82                 goto end;
  83         }
  84
  85         if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
  86                 chain_index = action & TC_ACT_EXT_VAL_MASK;
  87                 if (!tp || !newchain) {
  88                         ret = -EINVAL;
  89                         NL_SET_ERR_MSG(extack,
  90                                        "can't goto NULL proto/chain");
  91                         goto end;
  92                 }
  93                 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
  94                 if (!*newchain) {
  95                         ret = -ENOMEM;
  96                         NL_SET_ERR_MSG(extack,
  97                                        "can't allocate goto_chain");
  98                 }
  99         }
 100 end:
 101         return ret;
 102 }
 103 EXPORT_SYMBOL(tcf_action_check_ctrlact);
 104
 105 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
 106                                          struct tcf_chain *goto_chain)
 107 {
 108         a->tcfa_action = action;
 109         goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
 110         return goto_chain;
 111 }
 112 EXPORT_SYMBOL(tcf_action_set_ctrlact);
 113
 114 /* XXX: For standalone actions, we don't need a RCU grace period either, because
 115  * actions are always connected to filters and filters are already destroyed in
 116  * RCU callbacks, so after a RCU grace period actions are already disconnected
 117  * from filters. Readers later can not find us.
 118  */
 119 static void free_tcf(struct tc_action *p)
 120 {
 121         struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
 122
 123         free_percpu(p->cpu_bstats);
 124         free_percpu(p->cpu_bstats_hw);
 125         free_percpu(p->cpu_qstats);
 126
 127         tcf_set_action_cookie(&p->act_cookie, NULL);
 128         if (chain)
 129                 tcf_chain_put_by_act(chain);
 130
 131         kfree(p);
 132 }
 133
 134 static void offload_action_hw_count_set(struct tc_action *act,
 135                                         u32 hw_count)
 136 {
 137         act->in_hw_count = hw_count;
 138 }
 139
 140 static void offload_action_hw_count_inc(struct tc_action *act,
 141                                         u32 hw_count)
 142 {
 143         act->in_hw_count += hw_count;
 144 }
 145
 146 static void offload_action_hw_count_dec(struct tc_action *act,
 147                                         u32 hw_count)
 148 {
 149         act->in_hw_count = act->in_hw_count > hw_count ?
 150                            act->in_hw_count - hw_count : 0;
 151 }
 152
 153 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
 154 {
 155         if (is_tcf_pedit(act))
 156                 return tcf_pedit_nkeys(act);
 157         else
 158                 return 1;
 159 }
 160
 161 static bool tc_act_skip_hw(u32 flags)
 162 {
 163         return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
 164 }
 165
 166 static bool tc_act_skip_sw(u32 flags)
 167 {
 168         return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
 169 }
 170
 171 static bool tc_act_in_hw(struct tc_action *act)
 172 {
 173         return !!act->in_hw_count;
 174 }
 175
 176 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
 177 static bool tc_act_flags_valid(u32 flags)
 178 {
 179         flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
 180
 181         return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
 182 }
 183
 184 static int offload_action_init(struct flow_offload_action *fl_action,
 185                                struct tc_action *act,
 186                                enum offload_act_command  cmd,
 187                                struct netlink_ext_ack *extack)
 188 {
 189         int err;
 190
 191         fl_action->extack = extack;
 192         fl_action->command = cmd;
 193         fl_action->index = act->tcfa_index;
 194
 195         if (act->ops->offload_act_setup) {
 196                 spin_lock_bh(&act->tcfa_lock);
 197                 err = act->ops->offload_act_setup(act, fl_action, NULL,
 198                                                   false);
 199                 spin_unlock_bh(&act->tcfa_lock);
 200                 return err;
 201         }
 202
 203         return -EOPNOTSUPP;
 204 }
 205
 206 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
 207                                      u32 *hw_count)
 208 {
 209         int err;
 210
 211         err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
 212                                           fl_act, NULL, NULL);
 213         if (err < 0)
 214                 return err;
 215
 216         if (hw_count)
 217                 *hw_count = err;
 218
 219         return 0;
 220 }
 221
 222 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
 223                                         u32 *hw_count,
 224                                         flow_indr_block_bind_cb_t *cb,
 225                                         void *cb_priv)
 226 {
 227         int err;
 228
 229         err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
 230         if (err < 0)
 231                 return err;
 232
 233         if (hw_count)
 234                 *hw_count = 1;
 235
 236         return 0;
 237 }
 238
 239 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
 240                                   u32 *hw_count,
 241                                   flow_indr_block_bind_cb_t *cb,
 242                                   void *cb_priv)
 243 {
 244         return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
 245                                                  cb, cb_priv) :
 246                     tcf_action_offload_cmd_ex(fl_act, hw_count);
 247 }
 248
 249 static int tcf_action_offload_add_ex(struct tc_action *action,
 250                                      struct netlink_ext_ack *extack,
 251                                      flow_indr_block_bind_cb_t *cb,
 252                                      void *cb_priv)
 253 {
 254         bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
 255         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
 256                 [0] = action,
 257         };
 258         struct flow_offload_action *fl_action;
 259         u32 in_hw_count = 0;
 260         int num, err = 0;
 261
 262         if (tc_act_skip_hw(action->tcfa_flags))
 263                 return 0;
 264
 265         num = tcf_offload_act_num_actions_single(action);
 266         fl_action = offload_action_alloc(num);
 267         if (!fl_action)
 268                 return -ENOMEM;
 269
 270         err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
 271         if (err)
 272                 goto fl_err;
 273
 274         err = tc_setup_action(&fl_action->action, actions);
 275         if (err) {
 276                 NL_SET_ERR_MSG_MOD(extack,
 277                                    "Failed to setup tc actions for offload\n");
 278                 goto fl_err;
 279         }
 280
 281         err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
 282         if (!err)
 283                 cb ? offload_action_hw_count_inc(action, in_hw_count) :
 284                      offload_action_hw_count_set(action, in_hw_count);
 285
 286         if (skip_sw && !tc_act_in_hw(action))
 287                 err = -EINVAL;
 288
 289         tc_cleanup_offload_action(&fl_action->action);
 290
 291 fl_err:
 292         kfree(fl_action);
 293
 294         return err;
 295 }
 296
 297 /* offload the tc action after it is inserted */
 298 static int tcf_action_offload_add(struct tc_action *action,
 299                                   struct netlink_ext_ack *extack)
 300 {
 301         return tcf_action_offload_add_ex(action, extack, NULL, NULL);
 302 }
 303
 304 int tcf_action_update_hw_stats(struct tc_action *action)
 305 {
 306         struct flow_offload_action fl_act = {};
 307         int err;
 308
 309         if (!tc_act_in_hw(action))
 310                 return -EOPNOTSUPP;
 311
 312         err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
 313         if (err)
 314                 return err;
 315
 316         err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
 317         if (!err) {
 318                 preempt_disable();
 319                 tcf_action_stats_update(action, fl_act.stats.bytes,
 320                                         fl_act.stats.pkts,
 321                                         fl_act.stats.drops,
 322                                         fl_act.stats.lastused,
 323                                         true);
 324                 preempt_enable();
 325                 action->used_hw_stats = fl_act.stats.used_hw_stats;
 326                 action->used_hw_stats_valid = true;
 327         } else {
 328                 return -EOPNOTSUPP;
 329         }
 330
 331         return 0;
 332 }
 333 EXPORT_SYMBOL(tcf_action_update_hw_stats);
 334
 335 static int tcf_action_offload_del_ex(struct tc_action *action,
 336                                      flow_indr_block_bind_cb_t *cb,
 337                                      void *cb_priv)
 338 {
 339         struct flow_offload_action fl_act = {};
 340         u32 in_hw_count = 0;
 341         int err = 0;
 342
 343         if (!tc_act_in_hw(action))
 344                 return 0;
 345
 346         err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
 347         if (err)
 348                 return err;
 349
 350         err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
 351         if (err < 0)
 352                 return err;
 353
 354         if (!cb && action->in_hw_count != in_hw_count)
 355                 return -EINVAL;
 356
 357         /* do not need to update hw state when deleting action */
 358         if (cb && in_hw_count)
 359                 offload_action_hw_count_dec(action, in_hw_count);
 360
 361         return 0;
 362 }
 363
 364 static int tcf_action_offload_del(struct tc_action *action)
 365 {
 366         return tcf_action_offload_del_ex(action, NULL, NULL);
 367 }
 368
 369 static void tcf_action_cleanup(struct tc_action *p)
 370 {
 371         tcf_action_offload_del(p);
 372         if (p->ops->cleanup)
 373                 p->ops->cleanup(p);
 374
 375         gen_kill_estimator(&p->tcfa_rate_est);
 376         free_tcf(p);
 377 }
 378
 379 static int __tcf_action_put(struct tc_action *p, bool bind)
 380 {
 381         struct tcf_idrinfo *idrinfo = p->idrinfo;
 382
 383         if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
 384                 if (bind)
 385                         atomic_dec(&p->tcfa_bindcnt);
 386                 idr_remove(&idrinfo->action_idr, p->tcfa_index);
 387                 mutex_unlock(&idrinfo->lock);
 388
 389                 tcf_action_cleanup(p);
 390                 return 1;
 391         }
 392
 393         if (bind)
 394                 atomic_dec(&p->tcfa_bindcnt);
 395
 396         return 0;
 397 }
 398
 399 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
 400 {
 401         int ret = 0;
 402
 403         /* Release with strict==1 and bind==0 is only called through act API
 404          * interface (classifiers always bind). Only case when action with
 405          * positive reference count and zero bind count can exist is when it was
 406          * also created with act API (unbinding last classifier will destroy the
 407          * action if it was created by classifier). So only case when bind count
 408          * can be changed after initial check is when unbound action is
 409          * destroyed by act API while classifier binds to action with same id
 410          * concurrently. This result either creation of new action(same behavior
 411          * as before), or reusing existing action if concurrent process
 412          * increments reference count before action is deleted. Both scenarios
 413          * are acceptable.
 414          */
 415         if (p) {
 416                 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
 417                         return -EPERM;
 418
 419                 if (__tcf_action_put(p, bind))
 420                         ret = ACT_P_DELETED;
 421         }
 422
 423         return ret;
 424 }
 425
 426 int tcf_idr_release(struct tc_action *a, bool bind)
 427 {
 428         const struct tc_action_ops *ops = a->ops;
 429         int ret;
 430
 431         ret = __tcf_idr_release(a, bind, false);
 432         if (ret == ACT_P_DELETED)
 433                 module_put(ops->owner);
 434         return ret;
 435 }
 436 EXPORT_SYMBOL(tcf_idr_release);
 437
 438 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
 439 {
 440         struct tc_cookie *act_cookie;
 441         u32 cookie_len = 0;
 442
 443         rcu_read_lock();
 444         act_cookie = rcu_dereference(act->act_cookie);
 445
 446         if (act_cookie)
 447                 cookie_len = nla_total_size(act_cookie->len);
 448         rcu_read_unlock();
 449
 450         return  nla_total_size(0) /* action number nested */
 451                 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
 452                 + cookie_len /* TCA_ACT_COOKIE */
 453                 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
 454                 + nla_total_size(0) /* TCA_ACT_STATS nested */
 455                 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
 456                 /* TCA_STATS_BASIC */
 457                 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
 458                 /* TCA_STATS_PKT64 */
 459                 + nla_total_size_64bit(sizeof(u64))
 460                 /* TCA_STATS_QUEUE */
 461                 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
 462                 + nla_total_size(0) /* TCA_OPTIONS nested */
 463                 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
 464 }
 465
 466 static size_t tcf_action_full_attrs_size(size_t sz)
 467 {
 468         return NLMSG_HDRLEN                     /* struct nlmsghdr */
 469                 + sizeof(struct tcamsg)
 470                 + nla_total_size(0)             /* TCA_ACT_TAB nested */
 471                 + sz;
 472 }
 473
 474 static size_t tcf_action_fill_size(const struct tc_action *act)
 475 {
 476         size_t sz = tcf_action_shared_attrs_size(act);
 477
 478         if (act->ops->get_fill_size)
 479                 return act->ops->get_fill_size(act) + sz;
 480         return sz;
 481 }
 482
 483 static int
 484 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
 485 {
 486         unsigned char *b = skb_tail_pointer(skb);
 487         struct tc_cookie *cookie;
 488
 489         if (nla_put_string(skb, TCA_KIND, a->ops->kind))
 490                 goto nla_put_failure;
 491         if (tcf_action_copy_stats(skb, a, 0))
 492                 goto nla_put_failure;
 493         if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
 494                 goto nla_put_failure;
 495
 496         rcu_read_lock();
 497         cookie = rcu_dereference(a->act_cookie);
 498         if (cookie) {
 499                 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
 500                         rcu_read_unlock();
 501                         goto nla_put_failure;
 502                 }
 503         }
 504         rcu_read_unlock();
 505
 506         return 0;
 507
 508 nla_put_failure:
 509         nlmsg_trim(skb, b);
 510         return -1;
 511 }
 512
 513 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 514                            struct netlink_callback *cb)
 515 {
 516         int err = 0, index = -1, s_i = 0, n_i = 0;
 517         u32 act_flags = cb->args[2];
 518         unsigned long jiffy_since = cb->args[3];
 519         struct nlattr *nest;
 520         struct idr *idr = &idrinfo->action_idr;
 521         struct tc_action *p;
 522         unsigned long id = 1;
 523         unsigned long tmp;
 524
 525         mutex_lock(&idrinfo->lock);
 526
 527         s_i = cb->args[0];
 528
 529         idr_for_each_entry_ul(idr, p, tmp, id) {
 530                 index++;
 531                 if (index < s_i)
 532                         continue;
 533                 if (IS_ERR(p))
 534                         continue;
 535
 536                 if (jiffy_since &&
 537                     time_after(jiffy_since,
 538                                (unsigned long)p->tcfa_tm.lastuse))
 539                         continue;
 540
 541                 nest = nla_nest_start_noflag(skb, n_i);
 542                 if (!nest) {
 543                         index--;
 544                         goto nla_put_failure;
 545                 }
 546                 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
 547                         tcf_action_dump_terse(skb, p, true) :
 548                         tcf_action_dump_1(skb, p, 0, 0);
 549                 if (err < 0) {
 550                         index--;
 551                         nlmsg_trim(skb, nest);
 552                         goto done;
 553                 }
 554                 nla_nest_end(skb, nest);
 555                 n_i++;
 556                 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
 557                     n_i >= TCA_ACT_MAX_PRIO)
 558                         goto done;
 559         }
 560 done:
 561         if (index >= 0)
 562                 cb->args[0] = index + 1;
 563
 564         mutex_unlock(&idrinfo->lock);
 565         if (n_i) {
 566                 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
 567                         cb->args[1] = n_i;
 568         }
 569         return n_i;
 570
 571 nla_put_failure:
 572         nla_nest_cancel(skb, nest);
 573         goto done;
 574 }
 575
 576 static int tcf_idr_release_unsafe(struct tc_action *p)
 577 {
 578         if (atomic_read(&p->tcfa_bindcnt) > 0)
 579                 return -EPERM;
 580
 581         if (refcount_dec_and_test(&p->tcfa_refcnt)) {
 582                 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
 583                 tcf_action_cleanup(p);
 584                 return ACT_P_DELETED;
 585         }
 586
 587         return 0;
 588 }
 589
 590 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 591                           const struct tc_action_ops *ops)
 592 {
 593         struct nlattr *nest;
 594         int n_i = 0;
 595         int ret = -EINVAL;
 596         struct idr *idr = &idrinfo->action_idr;
 597         struct tc_action *p;
 598         unsigned long id = 1;
 599         unsigned long tmp;
 600
 601         nest = nla_nest_start_noflag(skb, 0);
 602         if (nest == NULL)
 603                 goto nla_put_failure;
 604         if (nla_put_string(skb, TCA_KIND, ops->kind))
 605                 goto nla_put_failure;
 606
 607         mutex_lock(&idrinfo->lock);
 608         idr_for_each_entry_ul(idr, p, tmp, id) {
 609                 if (IS_ERR(p))
 610                         continue;
 611                 ret = tcf_idr_release_unsafe(p);
 612                 if (ret == ACT_P_DELETED) {
 613                         module_put(ops->owner);
 614                         n_i++;
 615                 } else if (ret < 0) {
 616                         mutex_unlock(&idrinfo->lock);
 617                         goto nla_put_failure;
 618                 }
 619         }
 620         mutex_unlock(&idrinfo->lock);
 621
 622         ret = nla_put_u32(skb, TCA_FCNT, n_i);
 623         if (ret)
 624                 goto nla_put_failure;
 625         nla_nest_end(skb, nest);
 626
 627         return n_i;
 628 nla_put_failure:
 629         nla_nest_cancel(skb, nest);
 630         return ret;
 631 }
 632
 633 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 634                        struct netlink_callback *cb, int type,
 635                        const struct tc_action_ops *ops,
 636                        struct netlink_ext_ack *extack)
 637 {
 638         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 639
 640         if (type == RTM_DELACTION) {
 641                 return tcf_del_walker(idrinfo, skb, ops);
 642         } else if (type == RTM_GETACTION) {
 643                 return tcf_dump_walker(idrinfo, skb, cb);
 644         } else {
 645                 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
 646                 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
 647                 return -EINVAL;
 648         }
 649 }
 650 EXPORT_SYMBOL(tcf_generic_walker);
 651
 652 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
 653 {
 654         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 655         struct tc_action *p;
 656
 657         mutex_lock(&idrinfo->lock);
 658         p = idr_find(&idrinfo->action_idr, index);
 659         if (IS_ERR(p))
 660                 p = NULL;
 661         else if (p)
 662                 refcount_inc(&p->tcfa_refcnt);
 663         mutex_unlock(&idrinfo->lock);
 664
 665         if (p) {
 666                 *a = p;
 667                 return true;
 668         }
 669         return false;
 670 }
 671 EXPORT_SYMBOL(tcf_idr_search);
 672
 673 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
 674 {
 675         struct tc_action *p;
 676         int ret = 0;
 677
 678         mutex_lock(&idrinfo->lock);
 679         p = idr_find(&idrinfo->action_idr, index);
 680         if (!p) {
 681                 mutex_unlock(&idrinfo->lock);
 682                 return -ENOENT;
 683         }
 684
 685         if (!atomic_read(&p->tcfa_bindcnt)) {
 686                 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
 687                         struct module *owner = p->ops->owner;
 688
 689                         WARN_ON(p != idr_remove(&idrinfo->action_idr,
 690                                                 p->tcfa_index));
 691                         mutex_unlock(&idrinfo->lock);
 692
 693                         tcf_action_cleanup(p);
 694                         module_put(owner);
 695                         return 0;
 696                 }
 697                 ret = 0;
 698         } else {
 699                 ret = -EPERM;
 700         }
 701
 702         mutex_unlock(&idrinfo->lock);
 703         return ret;
 704 }
 705
 706 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 707                    struct tc_action **a, const struct tc_action_ops *ops,
 708                    int bind, bool cpustats, u32 flags)
 709 {
 710         struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
 711         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 712         int err = -ENOMEM;
 713
 714         if (unlikely(!p))
 715                 return -ENOMEM;
 716         refcount_set(&p->tcfa_refcnt, 1);
 717         if (bind)
 718                 atomic_set(&p->tcfa_bindcnt, 1);
 719
 720         if (cpustats) {
 721                 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
 722                 if (!p->cpu_bstats)
 723                         goto err1;
 724                 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
 725                 if (!p->cpu_bstats_hw)
 726                         goto err2;
 727                 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
 728                 if (!p->cpu_qstats)
 729                         goto err3;
 730         }
 731         gnet_stats_basic_sync_init(&p->tcfa_bstats);
 732         gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
 733         spin_lock_init(&p->tcfa_lock);
 734         p->tcfa_index = index;
 735         p->tcfa_tm.install = jiffies;
 736         p->tcfa_tm.lastuse = jiffies;
 737         p->tcfa_tm.firstuse = 0;
 738         p->tcfa_flags = flags;
 739         if (est) {
 740                 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
 741                                         &p->tcfa_rate_est,
 742                                         &p->tcfa_lock, false, est);
 743                 if (err)
 744                         goto err4;
 745         }
 746
 747         p->idrinfo = idrinfo;
 748         __module_get(ops->owner);
 749         p->ops = ops;
 750         *a = p;
 751         return 0;
 752 err4:
 753         free_percpu(p->cpu_qstats);
 754 err3:
 755         free_percpu(p->cpu_bstats_hw);
 756 err2:
 757         free_percpu(p->cpu_bstats);
 758 err1:
 759         kfree(p);
 760         return err;
 761 }
 762 EXPORT_SYMBOL(tcf_idr_create);
 763
 764 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
 765                               struct nlattr *est, struct tc_action **a,
 766                               const struct tc_action_ops *ops, int bind,
 767                               u32 flags)
 768 {
 769         /* Set cpustats according to actions flags. */
 770         return tcf_idr_create(tn, index, est, a, ops, bind,
 771                               !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
 772 }
 773 EXPORT_SYMBOL(tcf_idr_create_from_flags);
 774
 775 /* Cleanup idr index that was allocated but not initialized. */
 776
 777 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
 778 {
 779         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 780
 781         mutex_lock(&idrinfo->lock);
 782         /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
 783         WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
 784         mutex_unlock(&idrinfo->lock);
 785 }
 786 EXPORT_SYMBOL(tcf_idr_cleanup);
 787
 788 /* Check if action with specified index exists. If actions is found, increments
 789  * its reference and bind counters, and return 1. Otherwise insert temporary
 790  * error pointer (to prevent concurrent users from inserting actions with same
 791  * index) and return 0.
 792  */
 793
 794 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 795                         struct tc_action **a, int bind)
 796 {
 797         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 798         struct tc_action *p;
 799         int ret;
 800
 801 again:
 802         mutex_lock(&idrinfo->lock);
 803         if (*index) {
 804                 p = idr_find(&idrinfo->action_idr, *index);
 805                 if (IS_ERR(p)) {
 806                         /* This means that another process allocated
 807                          * index but did not assign the pointer yet.
 808                          */
 809                         mutex_unlock(&idrinfo->lock);
 810                         goto again;
 811                 }
 812
 813                 if (p) {
 814                         refcount_inc(&p->tcfa_refcnt);
 815                         if (bind)
 816                                 atomic_inc(&p->tcfa_bindcnt);
 817                         *a = p;
 818                         ret = 1;
 819                 } else {
 820                         *a = NULL;
 821                         ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
 822                                             *index, GFP_KERNEL);
 823                         if (!ret)
 824                                 idr_replace(&idrinfo->action_idr,
 825                                             ERR_PTR(-EBUSY), *index);
 826                 }
 827         } else {
 828                 *index = 1;
 829                 *a = NULL;
 830                 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
 831                                     UINT_MAX, GFP_KERNEL);
 832                 if (!ret)
 833                         idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
 834                                     *index);
 835         }
 836         mutex_unlock(&idrinfo->lock);
 837         return ret;
 838 }
 839 EXPORT_SYMBOL(tcf_idr_check_alloc);
 840
 841 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 842                          struct tcf_idrinfo *idrinfo)
 843 {
 844         struct idr *idr = &idrinfo->action_idr;
 845         struct tc_action *p;
 846         int ret;
 847         unsigned long id = 1;
 848         unsigned long tmp;
 849
 850         idr_for_each_entry_ul(idr, p, tmp, id) {
 851                 ret = __tcf_idr_release(p, false, true);
 852                 if (ret == ACT_P_DELETED)
 853                         module_put(ops->owner);
 854                 else if (ret < 0)
 855                         return;
 856         }
 857         idr_destroy(&idrinfo->action_idr);
 858 }
 859 EXPORT_SYMBOL(tcf_idrinfo_destroy);
 860
 861 static LIST_HEAD(act_base);
 862 static DEFINE_RWLOCK(act_mod_lock);
 863 /* since act ops id is stored in pernet subsystem list,
 864  * then there is no way to walk through only all the action
 865  * subsystem, so we keep tc action pernet ops id for
 866  * reoffload to walk through.
 867  */
 868 static LIST_HEAD(act_pernet_id_list);
 869 static DEFINE_MUTEX(act_id_mutex);
 870 struct tc_act_pernet_id {
 871         struct list_head list;
 872         unsigned int id;
 873 };
 874
 875 static int tcf_pernet_add_id_list(unsigned int id)
 876 {
 877         struct tc_act_pernet_id *id_ptr;
 878         int ret = 0;
 879
 880         mutex_lock(&act_id_mutex);
 881         list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
 882                 if (id_ptr->id == id) {
 883                         ret = -EEXIST;
 884                         goto err_out;
 885                 }
 886         }
 887
 888         id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
 889         if (!id_ptr) {
 890                 ret = -ENOMEM;
 891                 goto err_out;
 892         }
 893         id_ptr->id = id;
 894
 895         list_add_tail(&id_ptr->list, &act_pernet_id_list);
 896
 897 err_out:
 898         mutex_unlock(&act_id_mutex);
 899         return ret;
 900 }
 901
 902 static void tcf_pernet_del_id_list(unsigned int id)
 903 {
 904         struct tc_act_pernet_id *id_ptr;
 905
 906         mutex_lock(&act_id_mutex);
 907         list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
 908                 if (id_ptr->id == id) {
 909                         list_del(&id_ptr->list);
 910                         kfree(id_ptr);
 911                         break;
 912                 }
 913         }
 914         mutex_unlock(&act_id_mutex);
 915 }
 916
 917 int tcf_register_action(struct tc_action_ops *act,
 918                         struct pernet_operations *ops)
 919 {
 920         struct tc_action_ops *a;
 921         int ret;
 922
 923         if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
 924                 return -EINVAL;
 925
 926         /* We have to register pernet ops before making the action ops visible,
 927          * otherwise tcf_action_init_1() could get a partially initialized
 928          * netns.
 929          */
 930         ret = register_pernet_subsys(ops);
 931         if (ret)
 932                 return ret;
 933
 934         if (ops->id) {
 935                 ret = tcf_pernet_add_id_list(*ops->id);
 936                 if (ret)
 937                         goto err_id;
 938         }
 939
 940         write_lock(&act_mod_lock);
 941         list_for_each_entry(a, &act_base, head) {
 942                 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
 943                         ret = -EEXIST;
 944                         goto err_out;
 945                 }
 946         }
 947         list_add_tail(&act->head, &act_base);
 948         write_unlock(&act_mod_lock);
 949
 950         return 0;
 951
 952 err_out:
 953         write_unlock(&act_mod_lock);
 954         if (ops->id)
 955                 tcf_pernet_del_id_list(*ops->id);
 956 err_id:
 957         unregister_pernet_subsys(ops);
 958         return ret;
 959 }
 960 EXPORT_SYMBOL(tcf_register_action);
 961
 962 int tcf_unregister_action(struct tc_action_ops *act,
 963                           struct pernet_operations *ops)
 964 {
 965         struct tc_action_ops *a;
 966         int err = -ENOENT;
 967
 968         write_lock(&act_mod_lock);
 969         list_for_each_entry(a, &act_base, head) {
 970                 if (a == act) {
 971                         list_del(&act->head);
 972                         err = 0;
 973                         break;
 974                 }
 975         }
 976         write_unlock(&act_mod_lock);
 977         if (!err) {
 978                 unregister_pernet_subsys(ops);
 979                 if (ops->id)
 980                         tcf_pernet_del_id_list(*ops->id);
 981         }
 982         return err;
 983 }
 984 EXPORT_SYMBOL(tcf_unregister_action);
 985
 986 /* lookup by name */
 987 static struct tc_action_ops *tc_lookup_action_n(char *kind)
 988 {
 989         struct tc_action_ops *a, *res = NULL;
 990
 991         if (kind) {
 992                 read_lock(&act_mod_lock);
 993                 list_for_each_entry(a, &act_base, head) {
 994                         if (strcmp(kind, a->kind) == 0) {
 995                                 if (try_module_get(a->owner))
 996                                         res = a;
 997                                 break;
 998                         }
 999                 }
1000                 read_unlock(&act_mod_lock);
1001         }
1002         return res;
1003 }
1004
1005 /* lookup by nlattr */
1006 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1007 {
1008         struct tc_action_ops *a, *res = NULL;
1009
1010         if (kind) {
1011                 read_lock(&act_mod_lock);
1012                 list_for_each_entry(a, &act_base, head) {
1013                         if (nla_strcmp(kind, a->kind) == 0) {
1014                                 if (try_module_get(a->owner))
1015                                         res = a;
1016                                 break;
1017                         }
1018                 }
1019                 read_unlock(&act_mod_lock);
1020         }
1021         return res;
1022 }
1023
1024 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1025 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
1026 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1027                     int nr_actions, struct tcf_result *res)
1028 {
1029         u32 jmp_prgcnt = 0;
1030         u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1031         int i;
1032         int ret = TC_ACT_OK;
1033
1034         if (skb_skip_tc_classify(skb))
1035                 return TC_ACT_OK;
1036
1037 restart_act_graph:
1038         for (i = 0; i < nr_actions; i++) {
1039                 const struct tc_action *a = actions[i];
1040
1041                 if (jmp_prgcnt > 0) {
1042                         jmp_prgcnt -= 1;
1043                         continue;
1044                 }
1045
1046                 if (tc_act_skip_sw(a->tcfa_flags))
1047                         continue;
1048 repeat:
1049                 ret = a->ops->act(skb, a, res);
1050                 if (ret == TC_ACT_REPEAT)
1051                         goto repeat;    /* we need a ttl - JHS */
1052
1053                 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1054                         jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1055                         if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1056                                 /* faulty opcode, stop pipeline */
1057                                 return TC_ACT_OK;
1058                         } else {
1059                                 jmp_ttl -= 1;
1060                                 if (jmp_ttl > 0)
1061                                         goto restart_act_graph;
1062                                 else /* faulty graph, stop pipeline */
1063                                         return TC_ACT_OK;
1064                         }
1065                 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1066                         if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1067                                 net_warn_ratelimited("can't go to NULL chain!\n");
1068                                 return TC_ACT_SHOT;
1069                         }
1070                         tcf_action_goto_chain_exec(a, res);
1071                 }
1072
1073                 if (ret != TC_ACT_PIPE)
1074                         break;
1075         }
1076
1077         return ret;
1078 }
1079 EXPORT_SYMBOL(tcf_action_exec);
1080
1081 int tcf_action_destroy(struct tc_action *actions[], int bind)
1082 {
1083         const struct tc_action_ops *ops;
1084         struct tc_action *a;
1085         int ret = 0, i;
1086
1087         for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1088                 a = actions[i];
1089                 actions[i] = NULL;
1090                 ops = a->ops;
1091                 ret = __tcf_idr_release(a, bind, true);
1092                 if (ret == ACT_P_DELETED)
1093                         module_put(ops->owner);
1094                 else if (ret < 0)
1095                         return ret;
1096         }
1097         return ret;
1098 }
1099
1100 static int tcf_action_put(struct tc_action *p)
1101 {
1102         return __tcf_action_put(p, false);
1103 }
1104
1105 /* Put all actions in this array, skip those NULL's. */
1106 static void tcf_action_put_many(struct tc_action *actions[])
1107 {
1108         int i;
1109
1110         for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1111                 struct tc_action *a = actions[i];
1112                 const struct tc_action_ops *ops;
1113
1114                 if (!a)
1115                         continue;
1116                 ops = a->ops;
1117                 if (tcf_action_put(a))
1118                         module_put(ops->owner);
1119         }
1120 }
1121
1122 int
1123 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1124 {
1125         return a->ops->dump(skb, a, bind, ref);
1126 }
1127
1128 int
1129 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1130 {
1131         int err = -EINVAL;
1132         unsigned char *b = skb_tail_pointer(skb);
1133         struct nlattr *nest;
1134         u32 flags;
1135
1136         if (tcf_action_dump_terse(skb, a, false))
1137                 goto nla_put_failure;
1138
1139         if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1140             nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1141                                a->hw_stats, TCA_ACT_HW_STATS_ANY))
1142                 goto nla_put_failure;
1143
1144         if (a->used_hw_stats_valid &&
1145             nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1146                                a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1147                 goto nla_put_failure;
1148
1149         flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1150         if (flags &&
1151             nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1152                                flags, flags))
1153                 goto nla_put_failure;
1154
1155         if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1156                 goto nla_put_failure;
1157
1158         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1159         if (nest == NULL)
1160                 goto nla_put_failure;
1161         err = tcf_action_dump_old(skb, a, bind, ref);
1162         if (err > 0) {
1163                 nla_nest_end(skb, nest);
1164                 return err;
1165         }
1166
1167 nla_put_failure:
1168         nlmsg_trim(skb, b);
1169         return -1;
1170 }
1171 EXPORT_SYMBOL(tcf_action_dump_1);
1172
1173 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1174                     int bind, int ref, bool terse)
1175 {
1176         struct tc_action *a;
1177         int err = -EINVAL, i;
1178         struct nlattr *nest;
1179
1180         for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1181                 a = actions[i];
1182                 nest = nla_nest_start_noflag(skb, i + 1);
1183                 if (nest == NULL)
1184                         goto nla_put_failure;
1185                 err = terse ? tcf_action_dump_terse(skb, a, false) :
1186                         tcf_action_dump_1(skb, a, bind, ref);
1187                 if (err < 0)
1188                         goto errout;
1189                 nla_nest_end(skb, nest);
1190         }
1191
1192         return 0;
1193
1194 nla_put_failure:
1195         err = -EINVAL;
1196 errout:
1197         nla_nest_cancel(skb, nest);
1198         return err;
1199 }
1200
1201 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1202 {
1203         struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1204         if (!c)
1205                 return NULL;
1206
1207         c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1208         if (!c->data) {
1209                 kfree(c);
1210                 return NULL;
1211         }
1212         c->len = nla_len(tb[TCA_ACT_COOKIE]);
1213
1214         return c;
1215 }
1216
1217 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1218 {
1219         struct nla_bitfield32 hw_stats_bf;
1220
1221         /* If the user did not pass the attr, that means he does
1222          * not care about the type. Return "any" in that case
1223          * which is setting on all supported types.
1224          */
1225         if (!hw_stats_attr)
1226                 return TCA_ACT_HW_STATS_ANY;
1227         hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1228         return hw_stats_bf.value;
1229 }
1230
1231 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1232         [TCA_ACT_KIND]          = { .type = NLA_STRING },
1233         [TCA_ACT_INDEX]         = { .type = NLA_U32 },
1234         [TCA_ACT_COOKIE]        = { .type = NLA_BINARY,
1235                                     .len = TC_COOKIE_MAX_SIZE },
1236         [TCA_ACT_OPTIONS]       = { .type = NLA_NESTED },
1237         [TCA_ACT_FLAGS]         = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1238                                                         TCA_ACT_FLAGS_SKIP_HW |
1239                                                         TCA_ACT_FLAGS_SKIP_SW),
1240         [TCA_ACT_HW_STATS]      = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1241 };
1242
1243 void tcf_idr_insert_many(struct tc_action *actions[])
1244 {
1245         int i;
1246
1247         for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1248                 struct tc_action *a = actions[i];
1249                 struct tcf_idrinfo *idrinfo;
1250
1251                 if (!a)
1252                         continue;
1253                 idrinfo = a->idrinfo;
1254                 mutex_lock(&idrinfo->lock);
1255                 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
1256                  * it is just created, otherwise this is just a nop.
1257                  */
1258                 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1259                 mutex_unlock(&idrinfo->lock);
1260         }
1261 }
1262
1263 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
1264                                          bool rtnl_held,
1265                                          struct netlink_ext_ack *extack)
1266 {
1267         struct nlattr *tb[TCA_ACT_MAX + 1];
1268         struct tc_action_ops *a_o;
1269         char act_name[IFNAMSIZ];
1270         struct nlattr *kind;
1271         int err;
1272
1273         if (!police) {
1274                 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1275                                                   tcf_action_policy, extack);
1276                 if (err < 0)
1277                         return ERR_PTR(err);
1278                 err = -EINVAL;
1279                 kind = tb[TCA_ACT_KIND];
1280                 if (!kind) {
1281                         NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1282                         return ERR_PTR(err);
1283                 }
1284                 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1285                         NL_SET_ERR_MSG(extack, "TC action name too long");
1286                         return ERR_PTR(err);
1287                 }
1288         } else {
1289                 if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) {
1290                         NL_SET_ERR_MSG(extack, "TC action name too long");
1291                         return ERR_PTR(-EINVAL);
1292                 }
1293         }
1294
1295         a_o = tc_lookup_action_n(act_name);
1296         if (a_o == NULL) {
1297 #ifdef CONFIG_MODULES
1298                 if (rtnl_held)
1299                         rtnl_unlock();
1300                 request_module("act_%s", act_name);
1301                 if (rtnl_held)
1302                         rtnl_lock();
1303
1304                 a_o = tc_lookup_action_n(act_name);
1305
1306                 /* We dropped the RTNL semaphore in order to
1307                  * perform the module load.  So, even if we
1308                  * succeeded in loading the module we have to
1309                  * tell the caller to replay the request.  We
1310                  * indicate this using -EAGAIN.
1311                  */
1312                 if (a_o != NULL) {
1313                         module_put(a_o->owner);
1314                         return ERR_PTR(-EAGAIN);
1315                 }
1316 #endif
1317                 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1318                 return ERR_PTR(-ENOENT);
1319         }
1320
1321         return a_o;
1322 }
1323
1324 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1325                                     struct nlattr *nla, struct nlattr *est,
1326                                     struct tc_action_ops *a_o, int *init_res,
1327                                     u32 flags, struct netlink_ext_ack *extack)
1328 {
1329         bool police = flags & TCA_ACT_FLAGS_POLICE;
1330         struct nla_bitfield32 userflags = { 0, 0 };
1331         u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1332         struct nlattr *tb[TCA_ACT_MAX + 1];
1333         struct tc_cookie *cookie = NULL;
1334         struct tc_action *a;
1335         int err;
1336
1337         /* backward compatibility for policer */
1338         if (!police) {
1339                 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1340                                                   tcf_action_policy, extack);
1341                 if (err < 0)
1342                         return ERR_PTR(err);
1343                 if (tb[TCA_ACT_COOKIE]) {
1344                         cookie = nla_memdup_cookie(tb);
1345                         if (!cookie) {
1346                                 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1347                                 err = -ENOMEM;
1348                                 goto err_out;
1349                         }
1350                 }
1351                 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1352                 if (tb[TCA_ACT_FLAGS]) {
1353                         userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1354                         if (!tc_act_flags_valid(userflags.value)) {
1355                                 err = -EINVAL;
1356                                 goto err_out;
1357                         }
1358                 }
1359
1360                 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1361                                 userflags.value | flags, extack);
1362         } else {
1363                 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1364                                 extack);
1365         }
1366         if (err < 0)
1367                 goto err_out;
1368         *init_res = err;
1369
1370         if (!police && tb[TCA_ACT_COOKIE])
1371                 tcf_set_action_cookie(&a->act_cookie, cookie);
1372
1373         if (!police)
1374                 a->hw_stats = hw_stats;
1375
1376         return a;
1377
1378 err_out:
1379         if (cookie) {
1380                 kfree(cookie->data);
1381                 kfree(cookie);
1382         }
1383         return ERR_PTR(err);
1384 }
1385
1386 static bool tc_act_bind(u32 flags)
1387 {
1388         return !!(flags & TCA_ACT_FLAGS_BIND);
1389 }
1390
1391 /* Returns numbers of initialized actions or negative error. */
1392
1393 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1394                     struct nlattr *est, struct tc_action *actions[],
1395                     int init_res[], size_t *attr_size,
1396                     u32 flags, u32 fl_flags,
1397                     struct netlink_ext_ack *extack)
1398 {
1399         struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1400         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1401         struct tc_action *act;
1402         size_t sz = 0;
1403         int err;
1404         int i;
1405
1406         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1407                                           extack);
1408         if (err < 0)
1409                 return err;
1410
1411         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1412                 struct tc_action_ops *a_o;
1413
1414                 a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE,
1415                                          !(flags & TCA_ACT_FLAGS_NO_RTNL),
1416                                          extack);
1417                 if (IS_ERR(a_o)) {
1418                         err = PTR_ERR(a_o);
1419                         goto err_mod;
1420                 }
1421                 ops[i - 1] = a_o;
1422         }
1423
1424         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1425                 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1426                                         &init_res[i - 1], flags, extack);
1427                 if (IS_ERR(act)) {
1428                         err = PTR_ERR(act);
1429                         goto err;
1430                 }
1431                 sz += tcf_action_fill_size(act);
1432                 /* Start from index 0 */
1433                 actions[i - 1] = act;
1434                 if (tc_act_bind(flags)) {
1435                         bool skip_sw = tc_skip_sw(fl_flags);
1436                         bool skip_hw = tc_skip_hw(fl_flags);
1437
1438                         if (tc_act_bind(act->tcfa_flags))
1439                                 continue;
1440                         if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1441                             skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1442                                 err = -EINVAL;
1443                                 goto err;
1444                         }
1445                 } else {
1446                         err = tcf_action_offload_add(act, extack);
1447                         if (tc_act_skip_sw(act->tcfa_flags) && err)
1448                                 goto err;
1449                 }
1450         }
1451
1452         /* We have to commit them all together, because if any error happened in
1453          * between, we could not handle the failure gracefully.
1454          */
1455         tcf_idr_insert_many(actions);
1456
1457         *attr_size = tcf_action_full_attrs_size(sz);
1458         err = i - 1;
1459         goto err_mod;
1460
1461 err:
1462         tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1463 err_mod:
1464         for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1465                 if (ops[i])
1466                         module_put(ops[i]->owner);
1467         }
1468         return err;
1469 }
1470
1471 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1472                              u64 drops, bool hw)
1473 {
1474         if (a->cpu_bstats) {
1475                 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1476
1477                 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1478
1479                 if (hw)
1480                         _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1481                                        bytes, packets);
1482                 return;
1483         }
1484
1485         _bstats_update(&a->tcfa_bstats, bytes, packets);
1486         a->tcfa_qstats.drops += drops;
1487         if (hw)
1488                 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1489 }
1490 EXPORT_SYMBOL(tcf_action_update_stats);
1491
1492 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1493                           int compat_mode)
1494 {
1495         int err = 0;
1496         struct gnet_dump d;
1497
1498         if (p == NULL)
1499                 goto errout;
1500
1501         /* update hw stats for this action */
1502         tcf_action_update_hw_stats(p);
1503
1504         /* compat_mode being true specifies a call that is supposed
1505          * to add additional backward compatibility statistic TLVs.
1506          */
1507         if (compat_mode) {
1508                 if (p->type == TCA_OLD_COMPAT)
1509                         err = gnet_stats_start_copy_compat(skb, 0,
1510                                                            TCA_STATS,
1511                                                            TCA_XSTATS,
1512                                                            &p->tcfa_lock, &d,
1513                                                            TCA_PAD);
1514                 else
1515                         return 0;
1516         } else
1517                 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1518                                             &p->tcfa_lock, &d, TCA_ACT_PAD);
1519
1520         if (err < 0)
1521                 goto errout;
1522
1523         if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1524                                   &p->tcfa_bstats, false) < 0 ||
1525             gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1526                                      &p->tcfa_bstats_hw, false) < 0 ||
1527             gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1528             gnet_stats_copy_queue(&d, p->cpu_qstats,
1529                                   &p->tcfa_qstats,
1530                                   p->tcfa_qstats.qlen) < 0)
1531                 goto errout;
1532
1533         if (gnet_stats_finish_copy(&d) < 0)
1534                 goto errout;
1535
1536         return 0;
1537
1538 errout:
1539         return -1;
1540 }
1541
1542 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1543                         u32 portid, u32 seq, u16 flags, int event, int bind,
1544                         int ref)
1545 {
1546         struct tcamsg *t;
1547         struct nlmsghdr *nlh;
1548         unsigned char *b = skb_tail_pointer(skb);
1549         struct nlattr *nest;
1550
1551         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1552         if (!nlh)
1553                 goto out_nlmsg_trim;
1554         t = nlmsg_data(nlh);
1555         t->tca_family = AF_UNSPEC;
1556         t->tca__pad1 = 0;
1557         t->tca__pad2 = 0;
1558
1559         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1560         if (!nest)
1561                 goto out_nlmsg_trim;
1562
1563         if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1564                 goto out_nlmsg_trim;
1565
1566         nla_nest_end(skb, nest);
1567
1568         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1569         return skb->len;
1570
1571 out_nlmsg_trim:
1572         nlmsg_trim(skb, b);
1573         return -1;
1574 }
1575
1576 static int
1577 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1578                struct tc_action *actions[], int event,
1579                struct netlink_ext_ack *extack)
1580 {
1581         struct sk_buff *skb;
1582
1583         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1584         if (!skb)
1585                 return -ENOBUFS;
1586         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1587                          0, 1) <= 0) {
1588                 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1589                 kfree_skb(skb);
1590                 return -EINVAL;
1591         }
1592
1593         return rtnl_unicast(skb, net, portid);
1594 }
1595
1596 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1597                                           struct nlmsghdr *n, u32 portid,
1598                                           struct netlink_ext_ack *extack)
1599 {
1600         struct nlattr *tb[TCA_ACT_MAX + 1];
1601         const struct tc_action_ops *ops;
1602         struct tc_action *a;
1603         int index;
1604         int err;
1605
1606         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1607                                           tcf_action_policy, extack);
1608         if (err < 0)
1609                 goto err_out;
1610
1611         err = -EINVAL;
1612         if (tb[TCA_ACT_INDEX] == NULL ||
1613             nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1614                 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1615                 goto err_out;
1616         }
1617         index = nla_get_u32(tb[TCA_ACT_INDEX]);
1618
1619         err = -EINVAL;
1620         ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1621         if (!ops) { /* could happen in batch of actions */
1622                 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1623                 goto err_out;
1624         }
1625         err = -ENOENT;
1626         if (ops->lookup(net, &a, index) == 0) {
1627                 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1628                 goto err_mod;
1629         }
1630
1631         module_put(ops->owner);
1632         return a;
1633
1634 err_mod:
1635         module_put(ops->owner);
1636 err_out:
1637         return ERR_PTR(err);
1638 }
1639
1640 static int tca_action_flush(struct net *net, struct nlattr *nla,
1641                             struct nlmsghdr *n, u32 portid,
1642                             struct netlink_ext_ack *extack)
1643 {
1644         struct sk_buff *skb;
1645         unsigned char *b;
1646         struct nlmsghdr *nlh;
1647         struct tcamsg *t;
1648         struct netlink_callback dcb;
1649         struct nlattr *nest;
1650         struct nlattr *tb[TCA_ACT_MAX + 1];
1651         const struct tc_action_ops *ops;
1652         struct nlattr *kind;
1653         int err = -ENOMEM;
1654
1655         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1656         if (!skb)
1657                 return err;
1658
1659         b = skb_tail_pointer(skb);
1660
1661         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1662                                           tcf_action_policy, extack);
1663         if (err < 0)
1664                 goto err_out;
1665
1666         err = -EINVAL;
1667         kind = tb[TCA_ACT_KIND];
1668         ops = tc_lookup_action(kind);
1669         if (!ops) { /*some idjot trying to flush unknown action */
1670                 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1671                 goto err_out;
1672         }
1673
1674         nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1675                         sizeof(*t), 0);
1676         if (!nlh) {
1677                 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1678                 goto out_module_put;
1679         }
1680         t = nlmsg_data(nlh);
1681         t->tca_family = AF_UNSPEC;
1682         t->tca__pad1 = 0;
1683         t->tca__pad2 = 0;
1684
1685         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1686         if (!nest) {
1687                 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1688                 goto out_module_put;
1689         }
1690
1691         err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1692         if (err <= 0) {
1693                 nla_nest_cancel(skb, nest);
1694                 goto out_module_put;
1695         }
1696
1697         nla_nest_end(skb, nest);
1698
1699         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1700         nlh->nlmsg_flags |= NLM_F_ROOT;
1701         module_put(ops->owner);
1702         err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1703                              n->nlmsg_flags & NLM_F_ECHO);
1704         if (err < 0)
1705                 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1706
1707         return err;
1708
1709 out_module_put:
1710         module_put(ops->owner);
1711 err_out:
1712         kfree_skb(skb);
1713         return err;
1714 }
1715
1716 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1717 {
1718         int i;
1719
1720         for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1721                 struct tc_action *a = actions[i];
1722                 const struct tc_action_ops *ops = a->ops;
1723                 /* Actions can be deleted concurrently so we must save their
1724                  * type and id to search again after reference is released.
1725                  */
1726                 struct tcf_idrinfo *idrinfo = a->idrinfo;
1727                 u32 act_index = a->tcfa_index;
1728
1729                 actions[i] = NULL;
1730                 if (tcf_action_put(a)) {
1731                         /* last reference, action was deleted concurrently */
1732                         module_put(ops->owner);
1733                 } else  {
1734                         int ret;
1735
1736                         /* now do the delete */
1737                         ret = tcf_idr_delete_index(idrinfo, act_index);
1738                         if (ret < 0)
1739                                 return ret;
1740                 }
1741         }
1742         return 0;
1743 }
1744
1745 static int
1746 tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1747 {
1748         size_t attr_size = tcf_action_fill_size(action);
1749         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1750                 [0] = action,
1751         };
1752         const struct tc_action_ops *ops = action->ops;
1753         struct sk_buff *skb;
1754         int ret;
1755
1756         skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1757                         GFP_KERNEL);
1758         if (!skb)
1759                 return -ENOBUFS;
1760
1761         if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) {
1762                 kfree_skb(skb);
1763                 return -EINVAL;
1764         }
1765
1766         ret = tcf_idr_release_unsafe(action);
1767         if (ret == ACT_P_DELETED) {
1768                 module_put(ops->owner);
1769                 ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0);
1770         } else {
1771                 kfree_skb(skb);
1772         }
1773
1774         return ret;
1775 }
1776
1777 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1778                             void *cb_priv, bool add)
1779 {
1780         struct tc_act_pernet_id *id_ptr;
1781         struct tcf_idrinfo *idrinfo;
1782         struct tc_action_net *tn;
1783         struct tc_action *p;
1784         unsigned int act_id;
1785         unsigned long tmp;
1786         unsigned long id;
1787         struct idr *idr;
1788         struct net *net;
1789         int ret;
1790
1791         if (!cb)
1792                 return -EINVAL;
1793
1794         down_read(&net_rwsem);
1795         mutex_lock(&act_id_mutex);
1796
1797         for_each_net(net) {
1798                 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1799                         act_id = id_ptr->id;
1800                         tn = net_generic(net, act_id);
1801                         if (!tn)
1802                                 continue;
1803                         idrinfo = tn->idrinfo;
1804                         if (!idrinfo)
1805                                 continue;
1806
1807                         mutex_lock(&idrinfo->lock);
1808                         idr = &idrinfo->action_idr;
1809                         idr_for_each_entry_ul(idr, p, tmp, id) {
1810                                 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1811                                         continue;
1812                                 if (add) {
1813                                         tcf_action_offload_add_ex(p, NULL, cb,
1814                                                                   cb_priv);
1815                                         continue;
1816                                 }
1817
1818                                 /* cb unregister to update hw count */
1819                                 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1820                                 if (ret < 0)
1821                                         continue;
1822                                 if (tc_act_skip_sw(p->tcfa_flags) &&
1823                                     !tc_act_in_hw(p))
1824                                         tcf_reoffload_del_notify(net, p);
1825                         }
1826                         mutex_unlock(&idrinfo->lock);
1827                 }
1828         }
1829         mutex_unlock(&act_id_mutex);
1830         up_read(&net_rwsem);
1831
1832         return 0;
1833 }
1834
1835 static int
1836 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1837                u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1838 {
1839         int ret;
1840         struct sk_buff *skb;
1841
1842         skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1843                         GFP_KERNEL);
1844         if (!skb)
1845                 return -ENOBUFS;
1846
1847         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1848                          0, 2) <= 0) {
1849                 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1850                 kfree_skb(skb);
1851                 return -EINVAL;
1852         }
1853
1854         /* now do the delete */
1855         ret = tcf_action_delete(net, actions);
1856         if (ret < 0) {
1857                 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1858                 kfree_skb(skb);
1859                 return ret;
1860         }
1861
1862         ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1863                              n->nlmsg_flags & NLM_F_ECHO);
1864         return ret;
1865 }
1866
1867 static int
1868 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1869               u32 portid, int event, struct netlink_ext_ack *extack)
1870 {
1871         int i, ret;
1872         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1873         struct tc_action *act;
1874         size_t attr_size = 0;
1875         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1876
1877         ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1878                                           extack);
1879         if (ret < 0)
1880                 return ret;
1881
1882         if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1883                 if (tb[1])
1884                         return tca_action_flush(net, tb[1], n, portid, extack);
1885
1886                 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1887                 return -EINVAL;
1888         }
1889
1890         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1891                 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1892                 if (IS_ERR(act)) {
1893                         ret = PTR_ERR(act);
1894                         goto err;
1895                 }
1896                 attr_size += tcf_action_fill_size(act);
1897                 actions[i - 1] = act;
1898         }
1899
1900         attr_size = tcf_action_full_attrs_size(attr_size);
1901
1902         if (event == RTM_GETACTION)
1903                 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1904         else { /* delete */
1905                 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1906                 if (ret)
1907                         goto err;
1908                 return 0;
1909         }
1910 err:
1911         tcf_action_put_many(actions);
1912         return ret;
1913 }
1914
1915 static int
1916 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1917                u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1918 {
1919         struct sk_buff *skb;
1920
1921         skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1922                         GFP_KERNEL);
1923         if (!skb)
1924                 return -ENOBUFS;
1925
1926         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1927                          RTM_NEWACTION, 0, 0) <= 0) {
1928                 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1929                 kfree_skb(skb);
1930                 return -EINVAL;
1931         }
1932
1933         return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1934                               n->nlmsg_flags & NLM_F_ECHO);
1935 }
1936
1937 static int tcf_action_add(struct net *net, struct nlattr *nla,
1938                           struct nlmsghdr *n, u32 portid, u32 flags,
1939                           struct netlink_ext_ack *extack)
1940 {
1941         size_t attr_size = 0;
1942         int loop, ret, i;
1943         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1944         int init_res[TCA_ACT_MAX_PRIO] = {};
1945
1946         for (loop = 0; loop < 10; loop++) {
1947                 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
1948                                       &attr_size, flags, 0, extack);
1949                 if (ret != -EAGAIN)
1950                         break;
1951         }
1952
1953         if (ret < 0)
1954                 return ret;
1955         ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1956
1957         /* only put existing actions */
1958         for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
1959                 if (init_res[i] == ACT_P_CREATED)
1960                         actions[i] = NULL;
1961         tcf_action_put_many(actions);
1962
1963         return ret;
1964 }
1965
1966 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1967         [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
1968                                                  TCA_ACT_FLAG_TERSE_DUMP),
1969         [TCA_ROOT_TIME_DELTA]      = { .type = NLA_U32 },
1970 };
1971
1972 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1973                          struct netlink_ext_ack *extack)
1974 {
1975         struct net *net = sock_net(skb->sk);
1976         struct nlattr *tca[TCA_ROOT_MAX + 1];
1977         u32 portid = NETLINK_CB(skb).portid;
1978         u32 flags = 0;
1979         int ret = 0;
1980
1981         if ((n->nlmsg_type != RTM_GETACTION) &&
1982             !netlink_capable(skb, CAP_NET_ADMIN))
1983                 return -EPERM;
1984
1985         ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1986                                      TCA_ROOT_MAX, NULL, extack);
1987         if (ret < 0)
1988                 return ret;
1989
1990         if (tca[TCA_ACT_TAB] == NULL) {
1991                 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1992                 return -EINVAL;
1993         }
1994
1995         /* n->nlmsg_flags & NLM_F_CREATE */
1996         switch (n->nlmsg_type) {
1997         case RTM_NEWACTION:
1998                 /* we are going to assume all other flags
1999                  * imply create only if it doesn't exist
2000                  * Note that CREATE | EXCL implies that
2001                  * but since we want avoid ambiguity (eg when flags
2002                  * is zero) then just set this
2003                  */
2004                 if (n->nlmsg_flags & NLM_F_REPLACE)
2005                         flags = TCA_ACT_FLAGS_REPLACE;
2006                 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2007                                      extack);
2008                 break;
2009         case RTM_DELACTION:
2010                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2011                                     portid, RTM_DELACTION, extack);
2012                 break;
2013         case RTM_GETACTION:
2014                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2015                                     portid, RTM_GETACTION, extack);
2016                 break;
2017         default:
2018                 BUG();
2019         }
2020
2021         return ret;
2022 }
2023
2024 static struct nlattr *find_dump_kind(struct nlattr **nla)
2025 {
2026         struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2027         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2028         struct nlattr *kind;
2029
2030         tb1 = nla[TCA_ACT_TAB];
2031         if (tb1 == NULL)
2032                 return NULL;
2033
2034         if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2035                 return NULL;
2036
2037         if (tb[1] == NULL)
2038                 return NULL;
2039         if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2040                 return NULL;
2041         kind = tb2[TCA_ACT_KIND];
2042
2043         return kind;
2044 }
2045
2046 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2047 {
2048         struct net *net = sock_net(skb->sk);
2049         struct nlmsghdr *nlh;
2050         unsigned char *b = skb_tail_pointer(skb);
2051         struct nlattr *nest;
2052         struct tc_action_ops *a_o;
2053         int ret = 0;
2054         struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2055         struct nlattr *tb[TCA_ROOT_MAX + 1];
2056         struct nlattr *count_attr = NULL;
2057         unsigned long jiffy_since = 0;
2058         struct nlattr *kind = NULL;
2059         struct nla_bitfield32 bf;
2060         u32 msecs_since = 0;
2061         u32 act_count = 0;
2062
2063         ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2064                                      TCA_ROOT_MAX, tcaa_policy, cb->extack);
2065         if (ret < 0)
2066                 return ret;
2067
2068         kind = find_dump_kind(tb);
2069         if (kind == NULL) {
2070                 pr_info("tc_dump_action: action bad kind\n");
2071                 return 0;
2072         }
2073
2074         a_o = tc_lookup_action(kind);
2075         if (a_o == NULL)
2076                 return 0;
2077
2078         cb->args[2] = 0;
2079         if (tb[TCA_ROOT_FLAGS]) {
2080                 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2081                 cb->args[2] = bf.value;
2082         }
2083
2084         if (tb[TCA_ROOT_TIME_DELTA]) {
2085                 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2086         }
2087
2088         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2089                         cb->nlh->nlmsg_type, sizeof(*t), 0);
2090         if (!nlh)
2091                 goto out_module_put;
2092
2093         if (msecs_since)
2094                 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2095
2096         t = nlmsg_data(nlh);
2097         t->tca_family = AF_UNSPEC;
2098         t->tca__pad1 = 0;
2099         t->tca__pad2 = 0;
2100         cb->args[3] = jiffy_since;
2101         count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2102         if (!count_attr)
2103                 goto out_module_put;
2104
2105         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2106         if (nest == NULL)
2107                 goto out_module_put;
2108
2109         ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
2110         if (ret < 0)
2111                 goto out_module_put;
2112
2113         if (ret > 0) {
2114                 nla_nest_end(skb, nest);
2115                 ret = skb->len;
2116                 act_count = cb->args[1];
2117                 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2118                 cb->args[1] = 0;
2119         } else
2120                 nlmsg_trim(skb, b);
2121
2122         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2123         if (NETLINK_CB(cb->skb).portid && ret)
2124                 nlh->nlmsg_flags |= NLM_F_MULTI;
2125         module_put(a_o->owner);
2126         return skb->len;
2127
2128 out_module_put:
2129         module_put(a_o->owner);
2130         nlmsg_trim(skb, b);
2131         return skb->len;
2132 }
2133
2134 static int __init tc_action_init(void)
2135 {
2136         rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2137         rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2138         rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2139                       0);
2140
2141         return 0;
2142 }
2143
2144 subsys_initcall(tc_action_init);