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 #include <net/tc_wrapper.h>
  27
  28 #ifdef CONFIG_INET
  29 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
  30 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
  31 #endif
  32
  33 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
  34 {
  35 #ifdef CONFIG_INET
  36         if (static_branch_unlikely(&tcf_frag_xmit_count))
  37                 return sch_frag_xmit_hook(skb, xmit);
  38 #endif
  39
  40         return xmit(skb);
  41 }
  42 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
  43
  44 static void tcf_action_goto_chain_exec(const struct tc_action *a,
  45                                        struct tcf_result *res)
  46 {
  47         const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
  48
  49         res->goto_tp = rcu_dereference_bh(chain->filter_chain);
  50 }
  51
  52 static void tcf_free_cookie_rcu(struct rcu_head *p)
  53 {
  54         struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
  55
  56         kfree(cookie->data);
  57         kfree(cookie);
  58 }
  59
  60 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
  61                                   struct tc_cookie *new_cookie)
  62 {
  63         struct tc_cookie *old;
  64
  65         old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
  66         if (old)
  67                 call_rcu(&old->rcu, tcf_free_cookie_rcu);
  68 }
  69
  70 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
  71                              struct tcf_chain **newchain,
  72                              struct netlink_ext_ack *extack)
  73 {
  74         int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
  75         u32 chain_index;
  76
  77         if (!opcode)
  78                 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
  79         else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
  80                 ret = 0;
  81         if (ret) {
  82                 NL_SET_ERR_MSG(extack, "invalid control action");
  83                 goto end;
  84         }
  85
  86         if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
  87                 chain_index = action & TC_ACT_EXT_VAL_MASK;
  88                 if (!tp || !newchain) {
  89                         ret = -EINVAL;
  90                         NL_SET_ERR_MSG(extack,
  91                                        "can't goto NULL proto/chain");
  92                         goto end;
  93                 }
  94                 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
  95                 if (!*newchain) {
  96                         ret = -ENOMEM;
  97                         NL_SET_ERR_MSG(extack,
  98                                        "can't allocate goto_chain");
  99                 }
 100         }
 101 end:
 102         return ret;
 103 }
 104 EXPORT_SYMBOL(tcf_action_check_ctrlact);
 105
 106 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
 107                                          struct tcf_chain *goto_chain)
 108 {
 109         a->tcfa_action = action;
 110         goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
 111         return goto_chain;
 112 }
 113 EXPORT_SYMBOL(tcf_action_set_ctrlact);
 114
 115 /* XXX: For standalone actions, we don't need a RCU grace period either, because
 116  * actions are always connected to filters and filters are already destroyed in
 117  * RCU callbacks, so after a RCU grace period actions are already disconnected
 118  * from filters. Readers later can not find us.
 119  */
 120 static void free_tcf(struct tc_action *p)
 121 {
 122         struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
 123
 124         free_percpu(p->cpu_bstats);
 125         free_percpu(p->cpu_bstats_hw);
 126         free_percpu(p->cpu_qstats);
 127
 128         tcf_set_action_cookie(&p->user_cookie, NULL);
 129         if (chain)
 130                 tcf_chain_put_by_act(chain);
 131
 132         kfree(p);
 133 }
 134
 135 static void offload_action_hw_count_set(struct tc_action *act,
 136                                         u32 hw_count)
 137 {
 138         act->in_hw_count = hw_count;
 139 }
 140
 141 static void offload_action_hw_count_inc(struct tc_action *act,
 142                                         u32 hw_count)
 143 {
 144         act->in_hw_count += hw_count;
 145 }
 146
 147 static void offload_action_hw_count_dec(struct tc_action *act,
 148                                         u32 hw_count)
 149 {
 150         act->in_hw_count = act->in_hw_count > hw_count ?
 151                            act->in_hw_count - hw_count : 0;
 152 }
 153
 154 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
 155 {
 156         if (is_tcf_pedit(act))
 157                 return tcf_pedit_nkeys(act);
 158         else
 159                 return 1;
 160 }
 161
 162 static bool tc_act_skip_hw(u32 flags)
 163 {
 164         return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
 165 }
 166
 167 static bool tc_act_skip_sw(u32 flags)
 168 {
 169         return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
 170 }
 171
 172 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
 173 static bool tc_act_flags_valid(u32 flags)
 174 {
 175         flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
 176
 177         return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
 178 }
 179
 180 static int offload_action_init(struct flow_offload_action *fl_action,
 181                                struct tc_action *act,
 182                                enum offload_act_command  cmd,
 183                                struct netlink_ext_ack *extack)
 184 {
 185         int err;
 186
 187         fl_action->extack = extack;
 188         fl_action->command = cmd;
 189         fl_action->index = act->tcfa_index;
 190         fl_action->cookie = (unsigned long)act;
 191
 192         if (act->ops->offload_act_setup) {
 193                 spin_lock_bh(&act->tcfa_lock);
 194                 err = act->ops->offload_act_setup(act, fl_action, NULL,
 195                                                   false, extack);
 196                 spin_unlock_bh(&act->tcfa_lock);
 197                 return err;
 198         }
 199
 200         return -EOPNOTSUPP;
 201 }
 202
 203 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
 204                                      u32 *hw_count)
 205 {
 206         int err;
 207
 208         err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
 209                                           fl_act, NULL, NULL);
 210         if (err < 0)
 211                 return err;
 212
 213         if (hw_count)
 214                 *hw_count = err;
 215
 216         return 0;
 217 }
 218
 219 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
 220                                         u32 *hw_count,
 221                                         flow_indr_block_bind_cb_t *cb,
 222                                         void *cb_priv)
 223 {
 224         int err;
 225
 226         err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
 227         if (err < 0)
 228                 return err;
 229
 230         if (hw_count)
 231                 *hw_count = 1;
 232
 233         return 0;
 234 }
 235
 236 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
 237                                   u32 *hw_count,
 238                                   flow_indr_block_bind_cb_t *cb,
 239                                   void *cb_priv)
 240 {
 241         return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
 242                                                  cb, cb_priv) :
 243                     tcf_action_offload_cmd_ex(fl_act, hw_count);
 244 }
 245
 246 static int tcf_action_offload_add_ex(struct tc_action *action,
 247                                      struct netlink_ext_ack *extack,
 248                                      flow_indr_block_bind_cb_t *cb,
 249                                      void *cb_priv)
 250 {
 251         bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
 252         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
 253                 [0] = action,
 254         };
 255         struct flow_offload_action *fl_action;
 256         u32 in_hw_count = 0;
 257         int num, err = 0;
 258
 259         if (tc_act_skip_hw(action->tcfa_flags))
 260                 return 0;
 261
 262         num = tcf_offload_act_num_actions_single(action);
 263         fl_action = offload_action_alloc(num);
 264         if (!fl_action)
 265                 return -ENOMEM;
 266
 267         err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
 268         if (err)
 269                 goto fl_err;
 270
 271         err = tc_setup_action(&fl_action->action, actions, 0, extack);
 272         if (err) {
 273                 NL_SET_ERR_MSG_MOD(extack,
 274                                    "Failed to setup tc actions for offload");
 275                 goto fl_err;
 276         }
 277
 278         err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
 279         if (!err)
 280                 cb ? offload_action_hw_count_inc(action, in_hw_count) :
 281                      offload_action_hw_count_set(action, in_hw_count);
 282
 283         if (skip_sw && !tc_act_in_hw(action))
 284                 err = -EINVAL;
 285
 286         tc_cleanup_offload_action(&fl_action->action);
 287
 288 fl_err:
 289         kfree(fl_action);
 290
 291         return err;
 292 }
 293
 294 /* offload the tc action after it is inserted */
 295 static int tcf_action_offload_add(struct tc_action *action,
 296                                   struct netlink_ext_ack *extack)
 297 {
 298         return tcf_action_offload_add_ex(action, extack, NULL, NULL);
 299 }
 300
 301 int tcf_action_update_hw_stats(struct tc_action *action)
 302 {
 303         struct flow_offload_action fl_act = {};
 304         int err;
 305
 306         err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
 307         if (err)
 308                 return err;
 309
 310         err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
 311         if (!err) {
 312                 preempt_disable();
 313                 tcf_action_stats_update(action, fl_act.stats.bytes,
 314                                         fl_act.stats.pkts,
 315                                         fl_act.stats.drops,
 316                                         fl_act.stats.lastused,
 317                                         true);
 318                 preempt_enable();
 319                 action->used_hw_stats = fl_act.stats.used_hw_stats;
 320                 action->used_hw_stats_valid = true;
 321         } else {
 322                 return -EOPNOTSUPP;
 323         }
 324
 325         return 0;
 326 }
 327 EXPORT_SYMBOL(tcf_action_update_hw_stats);
 328
 329 static int tcf_action_offload_del_ex(struct tc_action *action,
 330                                      flow_indr_block_bind_cb_t *cb,
 331                                      void *cb_priv)
 332 {
 333         struct flow_offload_action fl_act = {};
 334         u32 in_hw_count = 0;
 335         int err = 0;
 336
 337         if (!tc_act_in_hw(action))
 338                 return 0;
 339
 340         err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
 341         if (err)
 342                 return err;
 343
 344         err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
 345         if (err < 0)
 346                 return err;
 347
 348         if (!cb && action->in_hw_count != in_hw_count)
 349                 return -EINVAL;
 350
 351         /* do not need to update hw state when deleting action */
 352         if (cb && in_hw_count)
 353                 offload_action_hw_count_dec(action, in_hw_count);
 354
 355         return 0;
 356 }
 357
 358 static int tcf_action_offload_del(struct tc_action *action)
 359 {
 360         return tcf_action_offload_del_ex(action, NULL, NULL);
 361 }
 362
 363 static void tcf_action_cleanup(struct tc_action *p)
 364 {
 365         tcf_action_offload_del(p);
 366         if (p->ops->cleanup)
 367                 p->ops->cleanup(p);
 368
 369         gen_kill_estimator(&p->tcfa_rate_est);
 370         free_tcf(p);
 371 }
 372
 373 static int __tcf_action_put(struct tc_action *p, bool bind)
 374 {
 375         struct tcf_idrinfo *idrinfo = p->idrinfo;
 376
 377         if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
 378                 if (bind)
 379                         atomic_dec(&p->tcfa_bindcnt);
 380                 idr_remove(&idrinfo->action_idr, p->tcfa_index);
 381                 mutex_unlock(&idrinfo->lock);
 382
 383                 tcf_action_cleanup(p);
 384                 return 1;
 385         }
 386
 387         if (bind)
 388                 atomic_dec(&p->tcfa_bindcnt);
 389
 390         return 0;
 391 }
 392
 393 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
 394 {
 395         int ret = 0;
 396
 397         /* Release with strict==1 and bind==0 is only called through act API
 398          * interface (classifiers always bind). Only case when action with
 399          * positive reference count and zero bind count can exist is when it was
 400          * also created with act API (unbinding last classifier will destroy the
 401          * action if it was created by classifier). So only case when bind count
 402          * can be changed after initial check is when unbound action is
 403          * destroyed by act API while classifier binds to action with same id
 404          * concurrently. This result either creation of new action(same behavior
 405          * as before), or reusing existing action if concurrent process
 406          * increments reference count before action is deleted. Both scenarios
 407          * are acceptable.
 408          */
 409         if (p) {
 410                 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
 411                         return -EPERM;
 412
 413                 if (__tcf_action_put(p, bind))
 414                         ret = ACT_P_DELETED;
 415         }
 416
 417         return ret;
 418 }
 419
 420 int tcf_idr_release(struct tc_action *a, bool bind)
 421 {
 422         const struct tc_action_ops *ops = a->ops;
 423         int ret;
 424
 425         ret = __tcf_idr_release(a, bind, false);
 426         if (ret == ACT_P_DELETED)
 427                 module_put(ops->owner);
 428         return ret;
 429 }
 430 EXPORT_SYMBOL(tcf_idr_release);
 431
 432 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
 433 {
 434         struct tc_cookie *user_cookie;
 435         u32 cookie_len = 0;
 436
 437         rcu_read_lock();
 438         user_cookie = rcu_dereference(act->user_cookie);
 439
 440         if (user_cookie)
 441                 cookie_len = nla_total_size(user_cookie->len);
 442         rcu_read_unlock();
 443
 444         return  nla_total_size(0) /* action number nested */
 445                 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
 446                 + cookie_len /* TCA_ACT_COOKIE */
 447                 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
 448                 + nla_total_size(0) /* TCA_ACT_STATS nested */
 449                 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
 450                 /* TCA_STATS_BASIC */
 451                 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
 452                 /* TCA_STATS_PKT64 */
 453                 + nla_total_size_64bit(sizeof(u64))
 454                 /* TCA_STATS_QUEUE */
 455                 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
 456                 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
 457                 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
 458 }
 459
 460 static size_t tcf_action_full_attrs_size(size_t sz)
 461 {
 462         return NLMSG_HDRLEN                     /* struct nlmsghdr */
 463                 + sizeof(struct tcamsg)
 464                 + nla_total_size(0)             /* TCA_ACT_TAB nested */
 465                 + sz;
 466 }
 467
 468 static size_t tcf_action_fill_size(const struct tc_action *act)
 469 {
 470         size_t sz = tcf_action_shared_attrs_size(act);
 471
 472         if (act->ops->get_fill_size)
 473                 return act->ops->get_fill_size(act) + sz;
 474         return sz;
 475 }
 476
 477 static int
 478 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
 479 {
 480         unsigned char *b = skb_tail_pointer(skb);
 481         struct tc_cookie *cookie;
 482
 483         if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
 484                 goto nla_put_failure;
 485         if (tcf_action_copy_stats(skb, a, 0))
 486                 goto nla_put_failure;
 487         if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
 488                 goto nla_put_failure;
 489
 490         rcu_read_lock();
 491         cookie = rcu_dereference(a->user_cookie);
 492         if (cookie) {
 493                 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
 494                         rcu_read_unlock();
 495                         goto nla_put_failure;
 496                 }
 497         }
 498         rcu_read_unlock();
 499
 500         return 0;
 501
 502 nla_put_failure:
 503         nlmsg_trim(skb, b);
 504         return -1;
 505 }
 506
 507 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 508                            struct netlink_callback *cb)
 509 {
 510         int err = 0, index = -1, s_i = 0, n_i = 0;
 511         u32 act_flags = cb->args[2];
 512         unsigned long jiffy_since = cb->args[3];
 513         struct nlattr *nest;
 514         struct idr *idr = &idrinfo->action_idr;
 515         struct tc_action *p;
 516         unsigned long id = 1;
 517         unsigned long tmp;
 518
 519         mutex_lock(&idrinfo->lock);
 520
 521         s_i = cb->args[0];
 522
 523         idr_for_each_entry_ul(idr, p, tmp, id) {
 524                 index++;
 525                 if (index < s_i)
 526                         continue;
 527                 if (IS_ERR(p))
 528                         continue;
 529
 530                 if (jiffy_since &&
 531                     time_after(jiffy_since,
 532                                (unsigned long)p->tcfa_tm.lastuse))
 533                         continue;
 534
 535                 tcf_action_update_hw_stats(p);
 536
 537                 nest = nla_nest_start_noflag(skb, n_i);
 538                 if (!nest) {
 539                         index--;
 540                         goto nla_put_failure;
 541                 }
 542                 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
 543                         tcf_action_dump_terse(skb, p, true) :
 544                         tcf_action_dump_1(skb, p, 0, 0);
 545                 if (err < 0) {
 546                         index--;
 547                         nlmsg_trim(skb, nest);
 548                         goto done;
 549                 }
 550                 nla_nest_end(skb, nest);
 551                 n_i++;
 552                 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
 553                     n_i >= TCA_ACT_MAX_PRIO)
 554                         goto done;
 555         }
 556 done:
 557         if (index >= 0)
 558                 cb->args[0] = index + 1;
 559
 560         mutex_unlock(&idrinfo->lock);
 561         if (n_i) {
 562                 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
 563                         cb->args[1] = n_i;
 564         }
 565         return n_i;
 566
 567 nla_put_failure:
 568         nla_nest_cancel(skb, nest);
 569         goto done;
 570 }
 571
 572 static int tcf_idr_release_unsafe(struct tc_action *p)
 573 {
 574         if (atomic_read(&p->tcfa_bindcnt) > 0)
 575                 return -EPERM;
 576
 577         if (refcount_dec_and_test(&p->tcfa_refcnt)) {
 578                 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
 579                 tcf_action_cleanup(p);
 580                 return ACT_P_DELETED;
 581         }
 582
 583         return 0;
 584 }
 585
 586 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 587                           const struct tc_action_ops *ops,
 588                           struct netlink_ext_ack *extack)
 589 {
 590         struct nlattr *nest;
 591         int n_i = 0;
 592         int ret = -EINVAL;
 593         struct idr *idr = &idrinfo->action_idr;
 594         struct tc_action *p;
 595         unsigned long id = 1;
 596         unsigned long tmp;
 597
 598         nest = nla_nest_start_noflag(skb, 0);
 599         if (nest == NULL)
 600                 goto nla_put_failure;
 601         if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
 602                 goto nla_put_failure;
 603
 604         ret = 0;
 605         mutex_lock(&idrinfo->lock);
 606         idr_for_each_entry_ul(idr, p, tmp, id) {
 607                 if (IS_ERR(p))
 608                         continue;
 609                 ret = tcf_idr_release_unsafe(p);
 610                 if (ret == ACT_P_DELETED)
 611                         module_put(ops->owner);
 612                 else if (ret < 0)
 613                         break;
 614                 n_i++;
 615         }
 616         mutex_unlock(&idrinfo->lock);
 617         if (ret < 0) {
 618                 if (n_i)
 619                         NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
 620                 else
 621                         goto nla_put_failure;
 622         }
 623
 624         ret = nla_put_u32(skb, TCA_FCNT, n_i);
 625         if (ret)
 626                 goto nla_put_failure;
 627         nla_nest_end(skb, nest);
 628
 629         return n_i;
 630 nla_put_failure:
 631         nla_nest_cancel(skb, nest);
 632         return ret;
 633 }
 634
 635 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 636                        struct netlink_callback *cb, int type,
 637                        const struct tc_action_ops *ops,
 638                        struct netlink_ext_ack *extack)
 639 {
 640         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 641
 642         if (type == RTM_DELACTION) {
 643                 return tcf_del_walker(idrinfo, skb, ops, extack);
 644         } else if (type == RTM_GETACTION) {
 645                 return tcf_dump_walker(idrinfo, skb, cb);
 646         } else {
 647                 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
 648                 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
 649                 return -EINVAL;
 650         }
 651 }
 652 EXPORT_SYMBOL(tcf_generic_walker);
 653
 654 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
 655 {
 656         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 657         struct tc_action *p;
 658
 659         mutex_lock(&idrinfo->lock);
 660         p = idr_find(&idrinfo->action_idr, index);
 661         if (IS_ERR(p))
 662                 p = NULL;
 663         else if (p)
 664                 refcount_inc(&p->tcfa_refcnt);
 665         mutex_unlock(&idrinfo->lock);
 666
 667         if (p) {
 668                 *a = p;
 669                 return true;
 670         }
 671         return false;
 672 }
 673 EXPORT_SYMBOL(tcf_idr_search);
 674
 675 static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
 676                                 struct netlink_callback *cb, int type,
 677                                 const struct tc_action_ops *ops,
 678                                 struct netlink_ext_ack *extack)
 679 {
 680         struct tc_action_net *tn = net_generic(net, ops->net_id);
 681
 682         if (unlikely(ops->walk))
 683                 return ops->walk(net, skb, cb, type, ops, extack);
 684
 685         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 686 }
 687
 688 static int __tcf_idr_search(struct net *net,
 689                             const struct tc_action_ops *ops,
 690                             struct tc_action **a, u32 index)
 691 {
 692         struct tc_action_net *tn = net_generic(net, ops->net_id);
 693
 694         if (unlikely(ops->lookup))
 695                 return ops->lookup(net, a, index);
 696
 697         return tcf_idr_search(tn, a, index);
 698 }
 699
 700 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
 701 {
 702         struct tc_action *p;
 703         int ret = 0;
 704
 705         mutex_lock(&idrinfo->lock);
 706         p = idr_find(&idrinfo->action_idr, index);
 707         if (!p) {
 708                 mutex_unlock(&idrinfo->lock);
 709                 return -ENOENT;
 710         }
 711
 712         if (!atomic_read(&p->tcfa_bindcnt)) {
 713                 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
 714                         struct module *owner = p->ops->owner;
 715
 716                         WARN_ON(p != idr_remove(&idrinfo->action_idr,
 717                                                 p->tcfa_index));
 718                         mutex_unlock(&idrinfo->lock);
 719
 720                         tcf_action_cleanup(p);
 721                         module_put(owner);
 722                         return 0;
 723                 }
 724                 ret = 0;
 725         } else {
 726                 ret = -EPERM;
 727         }
 728
 729         mutex_unlock(&idrinfo->lock);
 730         return ret;
 731 }
 732
 733 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 734                    struct tc_action **a, const struct tc_action_ops *ops,
 735                    int bind, bool cpustats, u32 flags)
 736 {
 737         struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
 738         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 739         int err = -ENOMEM;
 740
 741         if (unlikely(!p))
 742                 return -ENOMEM;
 743         refcount_set(&p->tcfa_refcnt, 1);
 744         if (bind)
 745                 atomic_set(&p->tcfa_bindcnt, 1);
 746
 747         if (cpustats) {
 748                 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
 749                 if (!p->cpu_bstats)
 750                         goto err1;
 751                 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
 752                 if (!p->cpu_bstats_hw)
 753                         goto err2;
 754                 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
 755                 if (!p->cpu_qstats)
 756                         goto err3;
 757         }
 758         gnet_stats_basic_sync_init(&p->tcfa_bstats);
 759         gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
 760         spin_lock_init(&p->tcfa_lock);
 761         p->tcfa_index = index;
 762         p->tcfa_tm.install = jiffies;
 763         p->tcfa_tm.lastuse = jiffies;
 764         p->tcfa_tm.firstuse = 0;
 765         p->tcfa_flags = flags;
 766         if (est) {
 767                 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
 768                                         &p->tcfa_rate_est,
 769                                         &p->tcfa_lock, false, est);
 770                 if (err)
 771                         goto err4;
 772         }
 773
 774         p->idrinfo = idrinfo;
 775         __module_get(ops->owner);
 776         p->ops = ops;
 777         *a = p;
 778         return 0;
 779 err4:
 780         free_percpu(p->cpu_qstats);
 781 err3:
 782         free_percpu(p->cpu_bstats_hw);
 783 err2:
 784         free_percpu(p->cpu_bstats);
 785 err1:
 786         kfree(p);
 787         return err;
 788 }
 789 EXPORT_SYMBOL(tcf_idr_create);
 790
 791 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
 792                               struct nlattr *est, struct tc_action **a,
 793                               const struct tc_action_ops *ops, int bind,
 794                               u32 flags)
 795 {
 796         /* Set cpustats according to actions flags. */
 797         return tcf_idr_create(tn, index, est, a, ops, bind,
 798                               !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
 799 }
 800 EXPORT_SYMBOL(tcf_idr_create_from_flags);
 801
 802 /* Cleanup idr index that was allocated but not initialized. */
 803
 804 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
 805 {
 806         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 807
 808         mutex_lock(&idrinfo->lock);
 809         /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
 810         WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
 811         mutex_unlock(&idrinfo->lock);
 812 }
 813 EXPORT_SYMBOL(tcf_idr_cleanup);
 814
 815 /* Check if action with specified index exists. If actions is found, increments
 816  * its reference and bind counters, and return 1. Otherwise insert temporary
 817  * error pointer (to prevent concurrent users from inserting actions with same
 818  * index) and return 0.
 819  *
 820  * May return -EAGAIN for binding actions in case of a parallel add/delete on
 821  * the requested index.
 822  */
 823
 824 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 825                         struct tc_action **a, int bind)
 826 {
 827         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 828         struct tc_action *p;
 829         int ret;
 830         u32 max;
 831
 832         if (*index) {
 833 again:
 834                 rcu_read_lock();
 835                 p = idr_find(&idrinfo->action_idr, *index);
 836
 837                 if (IS_ERR(p)) {
 838                         /* This means that another process allocated
 839                          * index but did not assign the pointer yet.
 840                          */
 841                         rcu_read_unlock();
 842                         goto again;
 843                 }
 844
 845                 if (!p) {
 846                         /* Empty slot, try to allocate it */
 847                         max = *index;
 848                         rcu_read_unlock();
 849                         goto new;
 850                 }
 851
 852                 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
 853                         /* Action was deleted in parallel */
 854                         rcu_read_unlock();
 855                         return -EAGAIN;
 856                 }
 857
 858                 if (bind)
 859                         atomic_inc(&p->tcfa_bindcnt);
 860                 *a = p;
 861
 862                 rcu_read_unlock();
 863
 864                 return 1;
 865         } else {
 866                 /* Find a slot */
 867                 *index = 1;
 868                 max = UINT_MAX;
 869         }
 870
 871 new:
 872         *a = NULL;
 873
 874         mutex_lock(&idrinfo->lock);
 875         ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
 876                             GFP_KERNEL);
 877         mutex_unlock(&idrinfo->lock);
 878
 879         /* N binds raced for action allocation,
 880          * retry for all the ones that failed.
 881          */
 882         if (ret == -ENOSPC && *index == max)
 883                 ret = -EAGAIN;
 884
 885         return ret;
 886 }
 887 EXPORT_SYMBOL(tcf_idr_check_alloc);
 888
 889 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 890                          struct tcf_idrinfo *idrinfo)
 891 {
 892         struct idr *idr = &idrinfo->action_idr;
 893         struct tc_action *p;
 894         int ret;
 895         unsigned long id = 1;
 896         unsigned long tmp;
 897
 898         idr_for_each_entry_ul(idr, p, tmp, id) {
 899                 ret = __tcf_idr_release(p, false, true);
 900                 if (ret == ACT_P_DELETED)
 901                         module_put(ops->owner);
 902                 else if (ret < 0)
 903                         return;
 904         }
 905         idr_destroy(&idrinfo->action_idr);
 906 }
 907 EXPORT_SYMBOL(tcf_idrinfo_destroy);
 908
 909 static LIST_HEAD(act_base);
 910 static DEFINE_RWLOCK(act_mod_lock);
 911 /* since act ops id is stored in pernet subsystem list,
 912  * then there is no way to walk through only all the action
 913  * subsystem, so we keep tc action pernet ops id for
 914  * reoffload to walk through.
 915  */
 916 static LIST_HEAD(act_pernet_id_list);
 917 static DEFINE_MUTEX(act_id_mutex);
 918 struct tc_act_pernet_id {
 919         struct list_head list;
 920         unsigned int id;
 921 };
 922
 923 static int tcf_pernet_add_id_list(unsigned int id)
 924 {
 925         struct tc_act_pernet_id *id_ptr;
 926         int ret = 0;
 927
 928         mutex_lock(&act_id_mutex);
 929         list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
 930                 if (id_ptr->id == id) {
 931                         ret = -EEXIST;
 932                         goto err_out;
 933                 }
 934         }
 935
 936         id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
 937         if (!id_ptr) {
 938                 ret = -ENOMEM;
 939                 goto err_out;
 940         }
 941         id_ptr->id = id;
 942
 943         list_add_tail(&id_ptr->list, &act_pernet_id_list);
 944
 945 err_out:
 946         mutex_unlock(&act_id_mutex);
 947         return ret;
 948 }
 949
 950 static void tcf_pernet_del_id_list(unsigned int id)
 951 {
 952         struct tc_act_pernet_id *id_ptr;
 953
 954         mutex_lock(&act_id_mutex);
 955         list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
 956                 if (id_ptr->id == id) {
 957                         list_del(&id_ptr->list);
 958                         kfree(id_ptr);
 959                         break;
 960                 }
 961         }
 962         mutex_unlock(&act_id_mutex);
 963 }
 964
 965 int tcf_register_action(struct tc_action_ops *act,
 966                         struct pernet_operations *ops)
 967 {
 968         struct tc_action_ops *a;
 969         int ret;
 970
 971         if (!act->act || !act->dump || !act->init)
 972                 return -EINVAL;
 973
 974         /* We have to register pernet ops before making the action ops visible,
 975          * otherwise tcf_action_init_1() could get a partially initialized
 976          * netns.
 977          */
 978         ret = register_pernet_subsys(ops);
 979         if (ret)
 980                 return ret;
 981
 982         if (ops->id) {
 983                 ret = tcf_pernet_add_id_list(*ops->id);
 984                 if (ret)
 985                         goto err_id;
 986         }
 987
 988         write_lock(&act_mod_lock);
 989         list_for_each_entry(a, &act_base, head) {
 990                 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
 991                         ret = -EEXIST;
 992                         goto err_out;
 993                 }
 994         }
 995         list_add_tail(&act->head, &act_base);
 996         write_unlock(&act_mod_lock);
 997
 998         return 0;
 999
1000 err_out:
1001         write_unlock(&act_mod_lock);
1002         if (ops->id)
1003                 tcf_pernet_del_id_list(*ops->id);
1004 err_id:
1005         unregister_pernet_subsys(ops);
1006         return ret;
1007 }
1008 EXPORT_SYMBOL(tcf_register_action);
1009
1010 int tcf_unregister_action(struct tc_action_ops *act,
1011                           struct pernet_operations *ops)
1012 {
1013         struct tc_action_ops *a;
1014         int err = -ENOENT;
1015
1016         write_lock(&act_mod_lock);
1017         list_for_each_entry(a, &act_base, head) {
1018                 if (a == act) {
1019                         list_del(&act->head);
1020                         err = 0;
1021                         break;
1022                 }
1023         }
1024         write_unlock(&act_mod_lock);
1025         if (!err) {
1026                 unregister_pernet_subsys(ops);
1027                 if (ops->id)
1028                         tcf_pernet_del_id_list(*ops->id);
1029         }
1030         return err;
1031 }
1032 EXPORT_SYMBOL(tcf_unregister_action);
1033
1034 /* lookup by name */
1035 static struct tc_action_ops *tc_lookup_action_n(char *kind)
1036 {
1037         struct tc_action_ops *a, *res = NULL;
1038
1039         if (kind) {
1040                 read_lock(&act_mod_lock);
1041                 list_for_each_entry(a, &act_base, head) {
1042                         if (strcmp(kind, a->kind) == 0) {
1043                                 if (try_module_get(a->owner))
1044                                         res = a;
1045                                 break;
1046                         }
1047                 }
1048                 read_unlock(&act_mod_lock);
1049         }
1050         return res;
1051 }
1052
1053 /* lookup by nlattr */
1054 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1055 {
1056         struct tc_action_ops *a, *res = NULL;
1057
1058         if (kind) {
1059                 read_lock(&act_mod_lock);
1060                 list_for_each_entry(a, &act_base, head) {
1061                         if (nla_strcmp(kind, a->kind) == 0) {
1062                                 if (try_module_get(a->owner))
1063                                         res = a;
1064                                 break;
1065                         }
1066                 }
1067                 read_unlock(&act_mod_lock);
1068         }
1069         return res;
1070 }
1071
1072 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1073 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
1074 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1075                     int nr_actions, struct tcf_result *res)
1076 {
1077         u32 jmp_prgcnt = 0;
1078         u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1079         int i;
1080         int ret = TC_ACT_OK;
1081
1082         if (skb_skip_tc_classify(skb))
1083                 return TC_ACT_OK;
1084
1085 restart_act_graph:
1086         for (i = 0; i < nr_actions; i++) {
1087                 const struct tc_action *a = actions[i];
1088                 int repeat_ttl;
1089
1090                 if (jmp_prgcnt > 0) {
1091                         jmp_prgcnt -= 1;
1092                         continue;
1093                 }
1094
1095                 if (tc_act_skip_sw(a->tcfa_flags))
1096                         continue;
1097
1098                 repeat_ttl = 32;
1099 repeat:
1100                 ret = tc_act(skb, a, res);
1101                 if (unlikely(ret == TC_ACT_REPEAT)) {
1102                         if (--repeat_ttl != 0)
1103                                 goto repeat;
1104                         /* suspicious opcode, stop pipeline */
1105                         net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1106                         return TC_ACT_OK;
1107                 }
1108                 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1109                         jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1110                         if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1111                                 /* faulty opcode, stop pipeline */
1112                                 return TC_ACT_OK;
1113                         } else {
1114                                 jmp_ttl -= 1;
1115                                 if (jmp_ttl > 0)
1116                                         goto restart_act_graph;
1117                                 else /* faulty graph, stop pipeline */
1118                                         return TC_ACT_OK;
1119                         }
1120                 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1121                         if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1122                                 tcf_set_drop_reason(skb,
1123                                                     SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1124                                 return TC_ACT_SHOT;
1125                         }
1126                         tcf_action_goto_chain_exec(a, res);
1127                 }
1128
1129                 if (ret != TC_ACT_PIPE)
1130                         break;
1131         }
1132
1133         return ret;
1134 }
1135 EXPORT_SYMBOL(tcf_action_exec);
1136
1137 int tcf_action_destroy(struct tc_action *actions[], int bind)
1138 {
1139         const struct tc_action_ops *ops;
1140         struct tc_action *a;
1141         int ret = 0, i;
1142
1143         tcf_act_for_each_action(i, a, actions) {
1144                 actions[i] = NULL;
1145                 ops = a->ops;
1146                 ret = __tcf_idr_release(a, bind, true);
1147                 if (ret == ACT_P_DELETED)
1148                         module_put(ops->owner);
1149                 else if (ret < 0)
1150                         return ret;
1151         }
1152         return ret;
1153 }
1154
1155 static int tcf_action_put(struct tc_action *p)
1156 {
1157         return __tcf_action_put(p, false);
1158 }
1159
1160 static void tcf_action_put_many(struct tc_action *actions[])
1161 {
1162         struct tc_action *a;
1163         int i;
1164
1165         tcf_act_for_each_action(i, a, actions) {
1166                 const struct tc_action_ops *ops = a->ops;
1167                 if (tcf_action_put(a))
1168                         module_put(ops->owner);
1169         }
1170 }
1171
1172 static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1173 {
1174         struct tc_action *a;
1175         int i;
1176
1177         tcf_act_for_each_action(i, a, actions) {
1178                 const struct tc_action_ops *ops = a->ops;
1179
1180                 if (init_res[i] == ACT_P_CREATED)
1181                         continue;
1182
1183                 if (tcf_action_put(a))
1184                         module_put(ops->owner);
1185         }
1186 }
1187
1188 int
1189 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1190 {
1191         return a->ops->dump(skb, a, bind, ref);
1192 }
1193
1194 int
1195 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1196 {
1197         int err = -EINVAL;
1198         unsigned char *b = skb_tail_pointer(skb);
1199         struct nlattr *nest;
1200         u32 flags;
1201
1202         if (tcf_action_dump_terse(skb, a, false))
1203                 goto nla_put_failure;
1204
1205         if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1206             nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1207                                a->hw_stats, TCA_ACT_HW_STATS_ANY))
1208                 goto nla_put_failure;
1209
1210         if (a->used_hw_stats_valid &&
1211             nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1212                                a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1213                 goto nla_put_failure;
1214
1215         flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1216         if (flags &&
1217             nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1218                                flags, flags))
1219                 goto nla_put_failure;
1220
1221         if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1222                 goto nla_put_failure;
1223
1224         nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
1225         if (nest == NULL)
1226                 goto nla_put_failure;
1227         err = tcf_action_dump_old(skb, a, bind, ref);
1228         if (err > 0) {
1229                 nla_nest_end(skb, nest);
1230                 return err;
1231         }
1232
1233 nla_put_failure:
1234         nlmsg_trim(skb, b);
1235         return -1;
1236 }
1237 EXPORT_SYMBOL(tcf_action_dump_1);
1238
1239 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1240                     int bind, int ref, bool terse)
1241 {
1242         struct tc_action *a;
1243         int err = -EINVAL, i;
1244         struct nlattr *nest;
1245
1246         tcf_act_for_each_action(i, a, actions) {
1247                 nest = nla_nest_start_noflag(skb, i + 1);
1248                 if (nest == NULL)
1249                         goto nla_put_failure;
1250                 err = terse ? tcf_action_dump_terse(skb, a, false) :
1251                         tcf_action_dump_1(skb, a, bind, ref);
1252                 if (err < 0)
1253                         goto errout;
1254                 nla_nest_end(skb, nest);
1255         }
1256
1257         return 0;
1258
1259 nla_put_failure:
1260         err = -EINVAL;
1261 errout:
1262         nla_nest_cancel(skb, nest);
1263         return err;
1264 }
1265
1266 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1267 {
1268         struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1269         if (!c)
1270                 return NULL;
1271
1272         c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1273         if (!c->data) {
1274                 kfree(c);
1275                 return NULL;
1276         }
1277         c->len = nla_len(tb[TCA_ACT_COOKIE]);
1278
1279         return c;
1280 }
1281
1282 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1283 {
1284         struct nla_bitfield32 hw_stats_bf;
1285
1286         /* If the user did not pass the attr, that means he does
1287          * not care about the type. Return "any" in that case
1288          * which is setting on all supported types.
1289          */
1290         if (!hw_stats_attr)
1291                 return TCA_ACT_HW_STATS_ANY;
1292         hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1293         return hw_stats_bf.value;
1294 }
1295
1296 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1297         [TCA_ACT_KIND]          = { .type = NLA_STRING },
1298         [TCA_ACT_INDEX]         = { .type = NLA_U32 },
1299         [TCA_ACT_COOKIE]        = { .type = NLA_BINARY,
1300                                     .len = TC_COOKIE_MAX_SIZE },
1301         [TCA_ACT_OPTIONS]       = { .type = NLA_NESTED },
1302         [TCA_ACT_FLAGS]         = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1303                                                         TCA_ACT_FLAGS_SKIP_HW |
1304                                                         TCA_ACT_FLAGS_SKIP_SW),
1305         [TCA_ACT_HW_STATS]      = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1306 };
1307
1308 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1309 {
1310         struct tc_action *a;
1311         int i;
1312
1313         tcf_act_for_each_action(i, a, actions) {
1314                 struct tcf_idrinfo *idrinfo;
1315
1316                 if (init_res[i] == ACT_P_BOUND)
1317                         continue;
1318
1319                 idrinfo = a->idrinfo;
1320                 mutex_lock(&idrinfo->lock);
1321                 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1322                 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1323                 mutex_unlock(&idrinfo->lock);
1324         }
1325 }
1326
1327 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1328                                          struct netlink_ext_ack *extack)
1329 {
1330         bool police = flags & TCA_ACT_FLAGS_POLICE;
1331         struct nlattr *tb[TCA_ACT_MAX + 1];
1332         struct tc_action_ops *a_o;
1333         char act_name[IFNAMSIZ];
1334         struct nlattr *kind;
1335         int err;
1336
1337         if (!police) {
1338                 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1339                                                   tcf_action_policy, extack);
1340                 if (err < 0)
1341                         return ERR_PTR(err);
1342                 err = -EINVAL;
1343                 kind = tb[TCA_ACT_KIND];
1344                 if (!kind) {
1345                         NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1346                         return ERR_PTR(err);
1347                 }
1348                 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1349                         NL_SET_ERR_MSG(extack, "TC action name too long");
1350                         return ERR_PTR(err);
1351                 }
1352         } else {
1353                 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1354                         NL_SET_ERR_MSG(extack, "TC action name too long");
1355                         return ERR_PTR(-EINVAL);
1356                 }
1357         }
1358
1359         a_o = tc_lookup_action_n(act_name);
1360         if (a_o == NULL) {
1361 #ifdef CONFIG_MODULES
1362                 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1363
1364                 if (rtnl_held)
1365                         rtnl_unlock();
1366                 request_module("act_%s", act_name);
1367                 if (rtnl_held)
1368                         rtnl_lock();
1369
1370                 a_o = tc_lookup_action_n(act_name);
1371
1372                 /* We dropped the RTNL semaphore in order to
1373                  * perform the module load.  So, even if we
1374                  * succeeded in loading the module we have to
1375                  * tell the caller to replay the request.  We
1376                  * indicate this using -EAGAIN.
1377                  */
1378                 if (a_o != NULL) {
1379                         module_put(a_o->owner);
1380                         return ERR_PTR(-EAGAIN);
1381                 }
1382 #endif
1383                 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1384                 return ERR_PTR(-ENOENT);
1385         }
1386
1387         return a_o;
1388 }
1389
1390 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1391                                     struct nlattr *nla, struct nlattr *est,
1392                                     struct tc_action_ops *a_o, int *init_res,
1393                                     u32 flags, struct netlink_ext_ack *extack)
1394 {
1395         bool police = flags & TCA_ACT_FLAGS_POLICE;
1396         struct nla_bitfield32 userflags = { 0, 0 };
1397         struct tc_cookie *user_cookie = NULL;
1398         u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1399         struct nlattr *tb[TCA_ACT_MAX + 1];
1400         struct tc_action *a;
1401         int err;
1402
1403         /* backward compatibility for policer */
1404         if (!police) {
1405                 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1406                                                   tcf_action_policy, extack);
1407                 if (err < 0)
1408                         return ERR_PTR(err);
1409                 if (tb[TCA_ACT_COOKIE]) {
1410                         user_cookie = nla_memdup_cookie(tb);
1411                         if (!user_cookie) {
1412                                 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1413                                 err = -ENOMEM;
1414                                 goto err_out;
1415                         }
1416                 }
1417                 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1418                 if (tb[TCA_ACT_FLAGS]) {
1419                         userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1420                         if (!tc_act_flags_valid(userflags.value)) {
1421                                 err = -EINVAL;
1422                                 goto err_out;
1423                         }
1424                 }
1425
1426                 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1427                                 userflags.value | flags, extack);
1428         } else {
1429                 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1430                                 extack);
1431         }
1432         if (err < 0)
1433                 goto err_out;
1434         *init_res = err;
1435
1436         if (!police && tb[TCA_ACT_COOKIE])
1437                 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1438
1439         if (!police)
1440                 a->hw_stats = hw_stats;
1441
1442         return a;
1443
1444 err_out:
1445         if (user_cookie) {
1446                 kfree(user_cookie->data);
1447                 kfree(user_cookie);
1448         }
1449         return ERR_PTR(err);
1450 }
1451
1452 static bool tc_act_bind(u32 flags)
1453 {
1454         return !!(flags & TCA_ACT_FLAGS_BIND);
1455 }
1456
1457 /* Returns numbers of initialized actions or negative error. */
1458
1459 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1460                     struct nlattr *est, struct tc_action *actions[],
1461                     int init_res[], size_t *attr_size,
1462                     u32 flags, u32 fl_flags,
1463                     struct netlink_ext_ack *extack)
1464 {
1465         struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1466         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1467         struct tc_action *act;
1468         size_t sz = 0;
1469         int err;
1470         int i;
1471
1472         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1473                                           extack);
1474         if (err < 0)
1475                 return err;
1476
1477         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1478                 struct tc_action_ops *a_o;
1479
1480                 a_o = tc_action_load_ops(tb[i], flags, extack);
1481                 if (IS_ERR(a_o)) {
1482                         err = PTR_ERR(a_o);
1483                         goto err_mod;
1484                 }
1485                 ops[i - 1] = a_o;
1486         }
1487
1488         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1489                 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1490                                         &init_res[i - 1], flags, extack);
1491                 if (IS_ERR(act)) {
1492                         err = PTR_ERR(act);
1493                         goto err;
1494                 }
1495                 sz += tcf_action_fill_size(act);
1496                 /* Start from index 0 */
1497                 actions[i - 1] = act;
1498                 if (tc_act_bind(flags)) {
1499                         bool skip_sw = tc_skip_sw(fl_flags);
1500                         bool skip_hw = tc_skip_hw(fl_flags);
1501
1502                         if (tc_act_bind(act->tcfa_flags))
1503                                 continue;
1504                         if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1505                             skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1506                                 NL_SET_ERR_MSG(extack,
1507                                                "Mismatch between action and filter offload flags");
1508                                 err = -EINVAL;
1509                                 goto err;
1510                         }
1511                 } else {
1512                         err = tcf_action_offload_add(act, extack);
1513                         if (tc_act_skip_sw(act->tcfa_flags) && err)
1514                                 goto err;
1515                 }
1516         }
1517
1518         /* We have to commit them all together, because if any error happened in
1519          * between, we could not handle the failure gracefully.
1520          */
1521         tcf_idr_insert_many(actions, init_res);
1522
1523         *attr_size = tcf_action_full_attrs_size(sz);
1524         err = i - 1;
1525         goto err_mod;
1526
1527 err:
1528         tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1529 err_mod:
1530         for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1531                 module_put(ops[i]->owner);
1532         return err;
1533 }
1534
1535 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1536                              u64 drops, bool hw)
1537 {
1538         if (a->cpu_bstats) {
1539                 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1540
1541                 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1542
1543                 if (hw)
1544                         _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1545                                        bytes, packets);
1546                 return;
1547         }
1548
1549         _bstats_update(&a->tcfa_bstats, bytes, packets);
1550         a->tcfa_qstats.drops += drops;
1551         if (hw)
1552                 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1553 }
1554 EXPORT_SYMBOL(tcf_action_update_stats);
1555
1556 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1557                           int compat_mode)
1558 {
1559         int err = 0;
1560         struct gnet_dump d;
1561
1562         if (p == NULL)
1563                 goto errout;
1564
1565         /* compat_mode being true specifies a call that is supposed
1566          * to add additional backward compatibility statistic TLVs.
1567          */
1568         if (compat_mode) {
1569                 if (p->type == TCA_OLD_COMPAT)
1570                         err = gnet_stats_start_copy_compat(skb, 0,
1571                                                            TCA_STATS,
1572                                                            TCA_XSTATS,
1573                                                            &p->tcfa_lock, &d,
1574                                                            TCA_PAD);
1575                 else
1576                         return 0;
1577         } else
1578                 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1579                                             &p->tcfa_lock, &d, TCA_ACT_PAD);
1580
1581         if (err < 0)
1582                 goto errout;
1583
1584         if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1585                                   &p->tcfa_bstats, false) < 0 ||
1586             gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1587                                      &p->tcfa_bstats_hw, false) < 0 ||
1588             gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1589             gnet_stats_copy_queue(&d, p->cpu_qstats,
1590                                   &p->tcfa_qstats,
1591                                   p->tcfa_qstats.qlen) < 0)
1592                 goto errout;
1593
1594         if (gnet_stats_finish_copy(&d) < 0)
1595                 goto errout;
1596
1597         return 0;
1598
1599 errout:
1600         return -1;
1601 }
1602
1603 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1604                         u32 portid, u32 seq, u16 flags, int event, int bind,
1605                         int ref, struct netlink_ext_ack *extack)
1606 {
1607         struct tcamsg *t;
1608         struct nlmsghdr *nlh;
1609         unsigned char *b = skb_tail_pointer(skb);
1610         struct nlattr *nest;
1611
1612         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1613         if (!nlh)
1614                 goto out_nlmsg_trim;
1615         t = nlmsg_data(nlh);
1616         t->tca_family = AF_UNSPEC;
1617         t->tca__pad1 = 0;
1618         t->tca__pad2 = 0;
1619
1620         if (extack && extack->_msg &&
1621             nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1622                 goto out_nlmsg_trim;
1623
1624         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1625         if (!nest)
1626                 goto out_nlmsg_trim;
1627
1628         if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1629                 goto out_nlmsg_trim;
1630
1631         nla_nest_end(skb, nest);
1632
1633         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1634
1635         return skb->len;
1636
1637 out_nlmsg_trim:
1638         nlmsg_trim(skb, b);
1639         return -1;
1640 }
1641
1642 static int
1643 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1644                struct tc_action *actions[], int event,
1645                struct netlink_ext_ack *extack)
1646 {
1647         struct sk_buff *skb;
1648
1649         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1650         if (!skb)
1651                 return -ENOBUFS;
1652         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1653                          0, 1, NULL) <= 0) {
1654                 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1655                 kfree_skb(skb);
1656                 return -EINVAL;
1657         }
1658
1659         return rtnl_unicast(skb, net, portid);
1660 }
1661
1662 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1663                                           struct nlmsghdr *n, u32 portid,
1664                                           struct netlink_ext_ack *extack)
1665 {
1666         struct nlattr *tb[TCA_ACT_MAX + 1];
1667         const struct tc_action_ops *ops;
1668         struct tc_action *a;
1669         int index;
1670         int err;
1671
1672         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1673                                           tcf_action_policy, extack);
1674         if (err < 0)
1675                 goto err_out;
1676
1677         err = -EINVAL;
1678         if (tb[TCA_ACT_INDEX] == NULL ||
1679             nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1680                 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1681                 goto err_out;
1682         }
1683         index = nla_get_u32(tb[TCA_ACT_INDEX]);
1684
1685         err = -EINVAL;
1686         ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1687         if (!ops) { /* could happen in batch of actions */
1688                 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1689                 goto err_out;
1690         }
1691         err = -ENOENT;
1692         if (__tcf_idr_search(net, ops, &a, index) == 0) {
1693                 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1694                 goto err_mod;
1695         }
1696
1697         module_put(ops->owner);
1698         return a;
1699
1700 err_mod:
1701         module_put(ops->owner);
1702 err_out:
1703         return ERR_PTR(err);
1704 }
1705
1706 static int tca_action_flush(struct net *net, struct nlattr *nla,
1707                             struct nlmsghdr *n, u32 portid,
1708                             struct netlink_ext_ack *extack)
1709 {
1710         struct sk_buff *skb;
1711         unsigned char *b;
1712         struct nlmsghdr *nlh;
1713         struct tcamsg *t;
1714         struct netlink_callback dcb;
1715         struct nlattr *nest;
1716         struct nlattr *tb[TCA_ACT_MAX + 1];
1717         const struct tc_action_ops *ops;
1718         struct nlattr *kind;
1719         int err = -ENOMEM;
1720
1721         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1722         if (!skb)
1723                 return err;
1724
1725         b = skb_tail_pointer(skb);
1726
1727         err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1728                                           tcf_action_policy, extack);
1729         if (err < 0)
1730                 goto err_out;
1731
1732         err = -EINVAL;
1733         kind = tb[TCA_ACT_KIND];
1734         ops = tc_lookup_action(kind);
1735         if (!ops) { /*some idjot trying to flush unknown action */
1736                 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1737                 goto err_out;
1738         }
1739
1740         nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1741                         sizeof(*t), 0);
1742         if (!nlh) {
1743                 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1744                 goto out_module_put;
1745         }
1746         t = nlmsg_data(nlh);
1747         t->tca_family = AF_UNSPEC;
1748         t->tca__pad1 = 0;
1749         t->tca__pad2 = 0;
1750
1751         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1752         if (!nest) {
1753                 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1754                 goto out_module_put;
1755         }
1756
1757         err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1758         if (err <= 0) {
1759                 nla_nest_cancel(skb, nest);
1760                 goto out_module_put;
1761         }
1762
1763         nla_nest_end(skb, nest);
1764
1765         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1766         nlh->nlmsg_flags |= NLM_F_ROOT;
1767         module_put(ops->owner);
1768         err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1769                              n->nlmsg_flags & NLM_F_ECHO);
1770         if (err < 0)
1771                 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1772
1773         return err;
1774
1775 out_module_put:
1776         module_put(ops->owner);
1777 err_out:
1778         kfree_skb(skb);
1779         return err;
1780 }
1781
1782 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1783 {
1784         struct tc_action *a;
1785         int i;
1786
1787         tcf_act_for_each_action(i, a, actions) {
1788                 const struct tc_action_ops *ops = a->ops;
1789                 /* Actions can be deleted concurrently so we must save their
1790                  * type and id to search again after reference is released.
1791                  */
1792                 struct tcf_idrinfo *idrinfo = a->idrinfo;
1793                 u32 act_index = a->tcfa_index;
1794
1795                 actions[i] = NULL;
1796                 if (tcf_action_put(a)) {
1797                         /* last reference, action was deleted concurrently */
1798                         module_put(ops->owner);
1799                 } else {
1800                         int ret;
1801
1802                         /* now do the delete */
1803                         ret = tcf_idr_delete_index(idrinfo, act_index);
1804                         if (ret < 0)
1805                                 return ret;
1806                 }
1807         }
1808         return 0;
1809 }
1810
1811 static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1812                                                     struct tc_action *action)
1813 {
1814         size_t attr_size = tcf_action_fill_size(action);
1815         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1816                 [0] = action,
1817         };
1818         struct sk_buff *skb;
1819
1820         skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1821         if (!skb)
1822                 return ERR_PTR(-ENOBUFS);
1823
1824         if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1825                 kfree_skb(skb);
1826                 return ERR_PTR(-EINVAL);
1827         }
1828
1829         return skb;
1830 }
1831
1832 static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1833 {
1834         const struct tc_action_ops *ops = action->ops;
1835         struct sk_buff *skb;
1836         int ret;
1837
1838         if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1839                 skb = NULL;
1840         } else {
1841                 skb = tcf_reoffload_del_notify_msg(net, action);
1842                 if (IS_ERR(skb))
1843                         return PTR_ERR(skb);
1844         }
1845
1846         ret = tcf_idr_release_unsafe(action);
1847         if (ret == ACT_P_DELETED) {
1848                 module_put(ops->owner);
1849                 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
1850         } else {
1851                 kfree_skb(skb);
1852         }
1853
1854         return ret;
1855 }
1856
1857 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1858                             void *cb_priv, bool add)
1859 {
1860         struct tc_act_pernet_id *id_ptr;
1861         struct tcf_idrinfo *idrinfo;
1862         struct tc_action_net *tn;
1863         struct tc_action *p;
1864         unsigned int act_id;
1865         unsigned long tmp;
1866         unsigned long id;
1867         struct idr *idr;
1868         struct net *net;
1869         int ret;
1870
1871         if (!cb)
1872                 return -EINVAL;
1873
1874         down_read(&net_rwsem);
1875         mutex_lock(&act_id_mutex);
1876
1877         for_each_net(net) {
1878                 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1879                         act_id = id_ptr->id;
1880                         tn = net_generic(net, act_id);
1881                         if (!tn)
1882                                 continue;
1883                         idrinfo = tn->idrinfo;
1884                         if (!idrinfo)
1885                                 continue;
1886
1887                         mutex_lock(&idrinfo->lock);
1888                         idr = &idrinfo->action_idr;
1889                         idr_for_each_entry_ul(idr, p, tmp, id) {
1890                                 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1891                                         continue;
1892                                 if (add) {
1893                                         tcf_action_offload_add_ex(p, NULL, cb,
1894                                                                   cb_priv);
1895                                         continue;
1896                                 }
1897
1898                                 /* cb unregister to update hw count */
1899                                 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1900                                 if (ret < 0)
1901                                         continue;
1902                                 if (tc_act_skip_sw(p->tcfa_flags) &&
1903                                     !tc_act_in_hw(p))
1904                                         tcf_reoffload_del_notify(net, p);
1905                         }
1906                         mutex_unlock(&idrinfo->lock);
1907                 }
1908         }
1909         mutex_unlock(&act_id_mutex);
1910         up_read(&net_rwsem);
1911
1912         return 0;
1913 }
1914
1915 static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1916                                           struct tc_action *actions[],
1917                                           u32 portid, size_t attr_size,
1918                                           struct netlink_ext_ack *extack)
1919 {
1920         struct sk_buff *skb;
1921
1922         skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1923         if (!skb)
1924                 return ERR_PTR(-ENOBUFS);
1925
1926         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1927                          0, 2, extack) <= 0) {
1928                 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1929                 kfree_skb(skb);
1930                 return ERR_PTR(-EINVAL);
1931         }
1932
1933         return skb;
1934 }
1935
1936 static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1937                           struct tc_action *actions[], u32 portid,
1938                           size_t attr_size, struct netlink_ext_ack *extack)
1939 {
1940         struct sk_buff *skb;
1941         int ret;
1942
1943         if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1944                 skb = NULL;
1945         } else {
1946                 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1947                                          extack);
1948                 if (IS_ERR(skb))
1949                         return PTR_ERR(skb);
1950         }
1951
1952         /* now do the delete */
1953         ret = tcf_action_delete(net, actions);
1954         if (ret < 0) {
1955                 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1956                 kfree_skb(skb);
1957                 return ret;
1958         }
1959
1960         return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1961                                     n->nlmsg_flags & NLM_F_ECHO);
1962 }
1963
1964 static int
1965 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1966               u32 portid, int event, struct netlink_ext_ack *extack)
1967 {
1968         int i, ret;
1969         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1970         struct tc_action *act;
1971         size_t attr_size = 0;
1972         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1973
1974         ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1975                                           extack);
1976         if (ret < 0)
1977                 return ret;
1978
1979         if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1980                 if (tb[1])
1981                         return tca_action_flush(net, tb[1], n, portid, extack);
1982
1983                 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1984                 return -EINVAL;
1985         }
1986
1987         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1988                 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1989                 if (IS_ERR(act)) {
1990                         ret = PTR_ERR(act);
1991                         goto err;
1992                 }
1993                 attr_size += tcf_action_fill_size(act);
1994                 actions[i - 1] = act;
1995         }
1996
1997         attr_size = tcf_action_full_attrs_size(attr_size);
1998
1999         if (event == RTM_GETACTION)
2000                 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2001         else { /* delete */
2002                 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2003                 if (ret)
2004                         goto err;
2005                 return 0;
2006         }
2007 err:
2008         tcf_action_put_many(actions);
2009         return ret;
2010 }
2011
2012 static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2013                                           struct tc_action *actions[],
2014                                           u32 portid, size_t attr_size,
2015                                           struct netlink_ext_ack *extack)
2016 {
2017         struct sk_buff *skb;
2018
2019         skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2020         if (!skb)
2021                 return ERR_PTR(-ENOBUFS);
2022
2023         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
2024                          RTM_NEWACTION, 0, 0, extack) <= 0) {
2025                 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2026                 kfree_skb(skb);
2027                 return ERR_PTR(-EINVAL);
2028         }
2029
2030         return skb;
2031 }
2032
2033 static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2034                           struct tc_action *actions[], u32 portid,
2035                           size_t attr_size, struct netlink_ext_ack *extack)
2036 {
2037         struct sk_buff *skb;
2038
2039         if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2040                 skb = NULL;
2041         } else {
2042                 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2043                                          extack);
2044                 if (IS_ERR(skb))
2045                         return PTR_ERR(skb);
2046         }
2047
2048         return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2049                                     n->nlmsg_flags & NLM_F_ECHO);
2050 }
2051
2052 static int tcf_action_add(struct net *net, struct nlattr *nla,
2053                           struct nlmsghdr *n, u32 portid, u32 flags,
2054                           struct netlink_ext_ack *extack)
2055 {
2056         size_t attr_size = 0;
2057         int loop, ret;
2058         struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2059         int init_res[TCA_ACT_MAX_PRIO] = {};
2060
2061         for (loop = 0; loop < 10; loop++) {
2062                 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2063                                       &attr_size, flags, 0, extack);
2064                 if (ret != -EAGAIN)
2065                         break;
2066         }
2067
2068         if (ret < 0)
2069                 return ret;
2070
2071         ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2072
2073         /* only put bound actions */
2074         tca_put_bound_many(actions, init_res);
2075
2076         return ret;
2077 }
2078
2079 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2080         [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2081                                                  TCA_ACT_FLAG_TERSE_DUMP),
2082         [TCA_ROOT_TIME_DELTA]      = { .type = NLA_U32 },
2083 };
2084
2085 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2086                          struct netlink_ext_ack *extack)
2087 {
2088         struct net *net = sock_net(skb->sk);
2089         struct nlattr *tca[TCA_ROOT_MAX + 1];
2090         u32 portid = NETLINK_CB(skb).portid;
2091         u32 flags = 0;
2092         int ret = 0;
2093
2094         if ((n->nlmsg_type != RTM_GETACTION) &&
2095             !netlink_capable(skb, CAP_NET_ADMIN))
2096                 return -EPERM;
2097
2098         ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2099                                      TCA_ROOT_MAX, NULL, extack);
2100         if (ret < 0)
2101                 return ret;
2102
2103         if (tca[TCA_ACT_TAB] == NULL) {
2104                 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2105                 return -EINVAL;
2106         }
2107
2108         /* n->nlmsg_flags & NLM_F_CREATE */
2109         switch (n->nlmsg_type) {
2110         case RTM_NEWACTION:
2111                 /* we are going to assume all other flags
2112                  * imply create only if it doesn't exist
2113                  * Note that CREATE | EXCL implies that
2114                  * but since we want avoid ambiguity (eg when flags
2115                  * is zero) then just set this
2116                  */
2117                 if (n->nlmsg_flags & NLM_F_REPLACE)
2118                         flags = TCA_ACT_FLAGS_REPLACE;
2119                 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2120                                      extack);
2121                 break;
2122         case RTM_DELACTION:
2123                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2124                                     portid, RTM_DELACTION, extack);
2125                 break;
2126         case RTM_GETACTION:
2127                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2128                                     portid, RTM_GETACTION, extack);
2129                 break;
2130         default:
2131                 BUG();
2132         }
2133
2134         return ret;
2135 }
2136
2137 static struct nlattr *find_dump_kind(struct nlattr **nla)
2138 {
2139         struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2140         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2141         struct nlattr *kind;
2142
2143         tb1 = nla[TCA_ACT_TAB];
2144         if (tb1 == NULL)
2145                 return NULL;
2146
2147         if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2148                 return NULL;
2149
2150         if (tb[1] == NULL)
2151                 return NULL;
2152         if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2153                 return NULL;
2154         kind = tb2[TCA_ACT_KIND];
2155
2156         return kind;
2157 }
2158
2159 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2160 {
2161         struct net *net = sock_net(skb->sk);
2162         struct nlmsghdr *nlh;
2163         unsigned char *b = skb_tail_pointer(skb);
2164         struct nlattr *nest;
2165         struct tc_action_ops *a_o;
2166         int ret = 0;
2167         struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2168         struct nlattr *tb[TCA_ROOT_MAX + 1];
2169         struct nlattr *count_attr = NULL;
2170         unsigned long jiffy_since = 0;
2171         struct nlattr *kind = NULL;
2172         struct nla_bitfield32 bf;
2173         u32 msecs_since = 0;
2174         u32 act_count = 0;
2175
2176         ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2177                                      TCA_ROOT_MAX, tcaa_policy, cb->extack);
2178         if (ret < 0)
2179                 return ret;
2180
2181         kind = find_dump_kind(tb);
2182         if (kind == NULL) {
2183                 pr_info("tc_dump_action: action bad kind\n");
2184                 return 0;
2185         }
2186
2187         a_o = tc_lookup_action(kind);
2188         if (a_o == NULL)
2189                 return 0;
2190
2191         cb->args[2] = 0;
2192         if (tb[TCA_ROOT_FLAGS]) {
2193                 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2194                 cb->args[2] = bf.value;
2195         }
2196
2197         if (tb[TCA_ROOT_TIME_DELTA]) {
2198                 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2199         }
2200
2201         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2202                         cb->nlh->nlmsg_type, sizeof(*t), 0);
2203         if (!nlh)
2204                 goto out_module_put;
2205
2206         if (msecs_since)
2207                 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2208
2209         t = nlmsg_data(nlh);
2210         t->tca_family = AF_UNSPEC;
2211         t->tca__pad1 = 0;
2212         t->tca__pad2 = 0;
2213         cb->args[3] = jiffy_since;
2214         count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2215         if (!count_attr)
2216                 goto out_module_put;
2217
2218         nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2219         if (nest == NULL)
2220                 goto out_module_put;
2221
2222         ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2223         if (ret < 0)
2224                 goto out_module_put;
2225
2226         if (ret > 0) {
2227                 nla_nest_end(skb, nest);
2228                 ret = skb->len;
2229                 act_count = cb->args[1];
2230                 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2231                 cb->args[1] = 0;
2232         } else
2233                 nlmsg_trim(skb, b);
2234
2235         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2236         if (NETLINK_CB(cb->skb).portid && ret)
2237                 nlh->nlmsg_flags |= NLM_F_MULTI;
2238         module_put(a_o->owner);
2239         return skb->len;
2240
2241 out_module_put:
2242         module_put(a_o->owner);
2243         nlmsg_trim(skb, b);
2244         return skb->len;
2245 }
2246
2247 static int __init tc_action_init(void)
2248 {
2249         rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2250         rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2251         rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2252                       0);
2253
2254         return 0;
2255 }
2256
2257 subsys_initcall(tc_action_init);