net/sched/act_api.c

   1 /*
   2  * net/sched/act_api.c  Packet action API.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Author:      Jamal Hadi Salim
  10  *
  11  *
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/init.h>
  21 #include <linux/kmod.h>
  22 #include <linux/err.h>
  23 #include <linux/module.h>
  24 #include <linux/rhashtable.h>
  25 #include <linux/list.h>
  26 #include <net/net_namespace.h>
  27 #include <net/sock.h>
  28 #include <net/sch_generic.h>
  29 #include <net/pkt_cls.h>
  30 #include <net/act_api.h>
  31 #include <net/netlink.h>
  32
  33 static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
  34 {
  35         u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
  36
  37         if (!tp)
  38                 return -EINVAL;
  39         a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
  40         if (!a->goto_chain)
  41                 return -ENOMEM;
  42         return 0;
  43 }
  44
  45 static void tcf_action_goto_chain_fini(struct tc_action *a)
  46 {
  47         tcf_chain_put(a->goto_chain);
  48 }
  49
  50 static void tcf_action_goto_chain_exec(const struct tc_action *a,
  51                                        struct tcf_result *res)
  52 {
  53         const struct tcf_chain *chain = a->goto_chain;
  54
  55         res->goto_tp = rcu_dereference_bh(chain->filter_chain);
  56 }
  57
  58 /* XXX: For standalone actions, we don't need a RCU grace period either, because
  59  * actions are always connected to filters and filters are already destroyed in
  60  * RCU callbacks, so after a RCU grace period actions are already disconnected
  61  * from filters. Readers later can not find us.
  62  */
  63 static void free_tcf(struct tc_action *p)
  64 {
  65         free_percpu(p->cpu_bstats);
  66         free_percpu(p->cpu_qstats);
  67
  68         if (p->act_cookie) {
  69                 kfree(p->act_cookie->data);
  70                 kfree(p->act_cookie);
  71         }
  72         if (p->goto_chain)
  73                 tcf_action_goto_chain_fini(p);
  74
  75         kfree(p);
  76 }
  77
  78 static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
  79 {
  80         spin_lock_bh(&idrinfo->lock);
  81         idr_remove(&idrinfo->action_idr, p->tcfa_index);
  82         spin_unlock_bh(&idrinfo->lock);
  83         gen_kill_estimator(&p->tcfa_rate_est);
  84         free_tcf(p);
  85 }
  86
  87 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
  88 {
  89         int ret = 0;
  90
  91         ASSERT_RTNL();
  92
  93         if (p) {
  94                 if (bind)
  95                         p->tcfa_bindcnt--;
  96                 else if (strict && p->tcfa_bindcnt > 0)
  97                         return -EPERM;
  98
  99                 p->tcfa_refcnt--;
 100                 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
 101                         if (p->ops->cleanup)
 102                                 p->ops->cleanup(p);
 103                         tcf_idr_remove(p->idrinfo, p);
 104                         ret = ACT_P_DELETED;
 105                 }
 106         }
 107
 108         return ret;
 109 }
 110 EXPORT_SYMBOL(__tcf_idr_release);
 111
 112 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 113                            struct netlink_callback *cb)
 114 {
 115         int err = 0, index = -1, s_i = 0, n_i = 0;
 116         u32 act_flags = cb->args[2];
 117         unsigned long jiffy_since = cb->args[3];
 118         struct nlattr *nest;
 119         struct idr *idr = &idrinfo->action_idr;
 120         struct tc_action *p;
 121         unsigned long id = 1;
 122
 123         spin_lock_bh(&idrinfo->lock);
 124
 125         s_i = cb->args[0];
 126
 127         idr_for_each_entry_ul(idr, p, id) {
 128                 index++;
 129                 if (index < s_i)
 130                         continue;
 131
 132                 if (jiffy_since &&
 133                     time_after(jiffy_since,
 134                                (unsigned long)p->tcfa_tm.lastuse))
 135                         continue;
 136
 137                 nest = nla_nest_start(skb, n_i);
 138                 if (!nest)
 139                         goto nla_put_failure;
 140                 err = tcf_action_dump_1(skb, p, 0, 0);
 141                 if (err < 0) {
 142                         index--;
 143                         nlmsg_trim(skb, nest);
 144                         goto done;
 145                 }
 146                 nla_nest_end(skb, nest);
 147                 n_i++;
 148                 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
 149                     n_i >= TCA_ACT_MAX_PRIO)
 150                         goto done;
 151         }
 152 done:
 153         if (index >= 0)
 154                 cb->args[0] = index + 1;
 155
 156         spin_unlock_bh(&idrinfo->lock);
 157         if (n_i) {
 158                 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
 159                         cb->args[1] = n_i;
 160         }
 161         return n_i;
 162
 163 nla_put_failure:
 164         nla_nest_cancel(skb, nest);
 165         goto done;
 166 }
 167
 168 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
 169                           const struct tc_action_ops *ops)
 170 {
 171         struct nlattr *nest;
 172         int n_i = 0;
 173         int ret = -EINVAL;
 174         struct idr *idr = &idrinfo->action_idr;
 175         struct tc_action *p;
 176         unsigned long id = 1;
 177
 178         nest = nla_nest_start(skb, 0);
 179         if (nest == NULL)
 180                 goto nla_put_failure;
 181         if (nla_put_string(skb, TCA_KIND, ops->kind))
 182                 goto nla_put_failure;
 183
 184         idr_for_each_entry_ul(idr, p, id) {
 185                 ret = __tcf_idr_release(p, false, true);
 186                 if (ret == ACT_P_DELETED) {
 187                         module_put(ops->owner);
 188                         n_i++;
 189                 } else if (ret < 0) {
 190                         goto nla_put_failure;
 191                 }
 192         }
 193         if (nla_put_u32(skb, TCA_FCNT, n_i))
 194                 goto nla_put_failure;
 195         nla_nest_end(skb, nest);
 196
 197         return n_i;
 198 nla_put_failure:
 199         nla_nest_cancel(skb, nest);
 200         return ret;
 201 }
 202
 203 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 204                        struct netlink_callback *cb, int type,
 205                        const struct tc_action_ops *ops)
 206 {
 207         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 208
 209         if (type == RTM_DELACTION) {
 210                 return tcf_del_walker(idrinfo, skb, ops);
 211         } else if (type == RTM_GETACTION) {
 212                 return tcf_dump_walker(idrinfo, skb, cb);
 213         } else {
 214                 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
 215                 return -EINVAL;
 216         }
 217 }
 218 EXPORT_SYMBOL(tcf_generic_walker);
 219
 220 static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
 221 {
 222         struct tc_action *p = NULL;
 223
 224         spin_lock_bh(&idrinfo->lock);
 225         p = idr_find(&idrinfo->action_idr, index);
 226         spin_unlock_bh(&idrinfo->lock);
 227
 228         return p;
 229 }
 230
 231 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
 232 {
 233         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 234         struct tc_action *p = tcf_idr_lookup(index, idrinfo);
 235
 236         if (p) {
 237                 *a = p;
 238                 return 1;
 239         }
 240         return 0;
 241 }
 242 EXPORT_SYMBOL(tcf_idr_search);
 243
 244 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
 245                    int bind)
 246 {
 247         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 248         struct tc_action *p = tcf_idr_lookup(index, idrinfo);
 249
 250         if (index && p) {
 251                 if (bind)
 252                         p->tcfa_bindcnt++;
 253                 p->tcfa_refcnt++;
 254                 *a = p;
 255                 return true;
 256         }
 257         return false;
 258 }
 259 EXPORT_SYMBOL(tcf_idr_check);
 260
 261 void tcf_idr_cleanup(struct tc_action *a, struct nlattr *est)
 262 {
 263         if (est)
 264                 gen_kill_estimator(&a->tcfa_rate_est);
 265         free_tcf(a);
 266 }
 267 EXPORT_SYMBOL(tcf_idr_cleanup);
 268
 269 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 270                    struct tc_action **a, const struct tc_action_ops *ops,
 271                    int bind, bool cpustats)
 272 {
 273         struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
 274         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 275         struct idr *idr = &idrinfo->action_idr;
 276         int err = -ENOMEM;
 277
 278         if (unlikely(!p))
 279                 return -ENOMEM;
 280         p->tcfa_refcnt = 1;
 281         if (bind)
 282                 p->tcfa_bindcnt = 1;
 283
 284         if (cpustats) {
 285                 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
 286                 if (!p->cpu_bstats)
 287                         goto err1;
 288                 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
 289                 if (!p->cpu_qstats)
 290                         goto err2;
 291         }
 292         spin_lock_init(&p->tcfa_lock);
 293         idr_preload(GFP_KERNEL);
 294         spin_lock_bh(&idrinfo->lock);
 295         /* user doesn't specify an index */
 296         if (!index) {
 297                 index = 1;
 298                 err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
 299         } else {
 300                 err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
 301         }
 302         spin_unlock_bh(&idrinfo->lock);
 303         idr_preload_end();
 304         if (err)
 305                 goto err3;
 306
 307         p->tcfa_index = index;
 308         p->tcfa_tm.install = jiffies;
 309         p->tcfa_tm.lastuse = jiffies;
 310         p->tcfa_tm.firstuse = 0;
 311         if (est) {
 312                 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
 313                                         &p->tcfa_rate_est,
 314                                         &p->tcfa_lock, NULL, est);
 315                 if (err)
 316                         goto err4;
 317         }
 318
 319         p->idrinfo = idrinfo;
 320         p->ops = ops;
 321         INIT_LIST_HEAD(&p->list);
 322         *a = p;
 323         return 0;
 324 err4:
 325         idr_remove(idr, index);
 326 err3:
 327         free_percpu(p->cpu_qstats);
 328 err2:
 329         free_percpu(p->cpu_bstats);
 330 err1:
 331         kfree(p);
 332         return err;
 333 }
 334 EXPORT_SYMBOL(tcf_idr_create);
 335
 336 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
 337 {
 338         struct tcf_idrinfo *idrinfo = tn->idrinfo;
 339
 340         spin_lock_bh(&idrinfo->lock);
 341         idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
 342         spin_unlock_bh(&idrinfo->lock);
 343 }
 344 EXPORT_SYMBOL(tcf_idr_insert);
 345
 346 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 347                          struct tcf_idrinfo *idrinfo)
 348 {
 349         struct idr *idr = &idrinfo->action_idr;
 350         struct tc_action *p;
 351         int ret;
 352         unsigned long id = 1;
 353
 354         idr_for_each_entry_ul(idr, p, id) {
 355                 ret = __tcf_idr_release(p, false, true);
 356                 if (ret == ACT_P_DELETED)
 357                         module_put(ops->owner);
 358                 else if (ret < 0)
 359                         return;
 360         }
 361         idr_destroy(&idrinfo->action_idr);
 362 }
 363 EXPORT_SYMBOL(tcf_idrinfo_destroy);
 364
 365 static LIST_HEAD(act_base);
 366 static DEFINE_RWLOCK(act_mod_lock);
 367
 368 int tcf_register_action(struct tc_action_ops *act,
 369                         struct pernet_operations *ops)
 370 {
 371         struct tc_action_ops *a;
 372         int ret;
 373
 374         if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
 375                 return -EINVAL;
 376
 377         /* We have to register pernet ops before making the action ops visible,
 378          * otherwise tcf_action_init_1() could get a partially initialized
 379          * netns.
 380          */
 381         ret = register_pernet_subsys(ops);
 382         if (ret)
 383                 return ret;
 384
 385         write_lock(&act_mod_lock);
 386         list_for_each_entry(a, &act_base, head) {
 387                 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
 388                         write_unlock(&act_mod_lock);
 389                         unregister_pernet_subsys(ops);
 390                         return -EEXIST;
 391                 }
 392         }
 393         list_add_tail(&act->head, &act_base);
 394         write_unlock(&act_mod_lock);
 395
 396         return 0;
 397 }
 398 EXPORT_SYMBOL(tcf_register_action);
 399
 400 int tcf_unregister_action(struct tc_action_ops *act,
 401                           struct pernet_operations *ops)
 402 {
 403         struct tc_action_ops *a;
 404         int err = -ENOENT;
 405
 406         write_lock(&act_mod_lock);
 407         list_for_each_entry(a, &act_base, head) {
 408                 if (a == act) {
 409                         list_del(&act->head);
 410                         err = 0;
 411                         break;
 412                 }
 413         }
 414         write_unlock(&act_mod_lock);
 415         if (!err)
 416                 unregister_pernet_subsys(ops);
 417         return err;
 418 }
 419 EXPORT_SYMBOL(tcf_unregister_action);
 420
 421 /* lookup by name */
 422 static struct tc_action_ops *tc_lookup_action_n(char *kind)
 423 {
 424         struct tc_action_ops *a, *res = NULL;
 425
 426         if (kind) {
 427                 read_lock(&act_mod_lock);
 428                 list_for_each_entry(a, &act_base, head) {
 429                         if (strcmp(kind, a->kind) == 0) {
 430                                 if (try_module_get(a->owner))
 431                                         res = a;
 432                                 break;
 433                         }
 434                 }
 435                 read_unlock(&act_mod_lock);
 436         }
 437         return res;
 438 }
 439
 440 /* lookup by nlattr */
 441 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
 442 {
 443         struct tc_action_ops *a, *res = NULL;
 444
 445         if (kind) {
 446                 read_lock(&act_mod_lock);
 447                 list_for_each_entry(a, &act_base, head) {
 448                         if (nla_strcmp(kind, a->kind) == 0) {
 449                                 if (try_module_get(a->owner))
 450                                         res = a;
 451                                 break;
 452                         }
 453                 }
 454                 read_unlock(&act_mod_lock);
 455         }
 456         return res;
 457 }
 458
 459 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
 460 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
 461 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 462                     int nr_actions, struct tcf_result *res)
 463 {
 464         u32 jmp_prgcnt = 0;
 465         u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
 466         int i;
 467         int ret = TC_ACT_OK;
 468
 469         if (skb_skip_tc_classify(skb))
 470                 return TC_ACT_OK;
 471
 472 restart_act_graph:
 473         for (i = 0; i < nr_actions; i++) {
 474                 const struct tc_action *a = actions[i];
 475
 476                 if (jmp_prgcnt > 0) {
 477                         jmp_prgcnt -= 1;
 478                         continue;
 479                 }
 480 repeat:
 481                 ret = a->ops->act(skb, a, res);
 482                 if (ret == TC_ACT_REPEAT)
 483                         goto repeat;    /* we need a ttl - JHS */
 484
 485                 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
 486                         jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
 487                         if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
 488                                 /* faulty opcode, stop pipeline */
 489                                 return TC_ACT_OK;
 490                         } else {
 491                                 jmp_ttl -= 1;
 492                                 if (jmp_ttl > 0)
 493                                         goto restart_act_graph;
 494                                 else /* faulty graph, stop pipeline */
 495                                         return TC_ACT_OK;
 496                         }
 497                 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
 498                         tcf_action_goto_chain_exec(a, res);
 499                 }
 500
 501                 if (ret != TC_ACT_PIPE)
 502                         break;
 503         }
 504
 505         return ret;
 506 }
 507 EXPORT_SYMBOL(tcf_action_exec);
 508
 509 int tcf_action_destroy(struct list_head *actions, int bind)
 510 {
 511         const struct tc_action_ops *ops;
 512         struct tc_action *a, *tmp;
 513         int ret = 0;
 514
 515         list_for_each_entry_safe(a, tmp, actions, list) {
 516                 ops = a->ops;
 517                 ret = __tcf_idr_release(a, bind, true);
 518                 if (ret == ACT_P_DELETED)
 519                         module_put(ops->owner);
 520                 else if (ret < 0)
 521                         return ret;
 522         }
 523         return ret;
 524 }
 525
 526 int
 527 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 528 {
 529         return a->ops->dump(skb, a, bind, ref);
 530 }
 531
 532 int
 533 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 534 {
 535         int err = -EINVAL;
 536         unsigned char *b = skb_tail_pointer(skb);
 537         struct nlattr *nest;
 538
 539         if (nla_put_string(skb, TCA_KIND, a->ops->kind))
 540                 goto nla_put_failure;
 541         if (tcf_action_copy_stats(skb, a, 0))
 542                 goto nla_put_failure;
 543         if (a->act_cookie) {
 544                 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
 545                             a->act_cookie->data))
 546                         goto nla_put_failure;
 547         }
 548
 549         nest = nla_nest_start(skb, TCA_OPTIONS);
 550         if (nest == NULL)
 551                 goto nla_put_failure;
 552         err = tcf_action_dump_old(skb, a, bind, ref);
 553         if (err > 0) {
 554                 nla_nest_end(skb, nest);
 555                 return err;
 556         }
 557
 558 nla_put_failure:
 559         nlmsg_trim(skb, b);
 560         return -1;
 561 }
 562 EXPORT_SYMBOL(tcf_action_dump_1);
 563
 564 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
 565                     int bind, int ref)
 566 {
 567         struct tc_action *a;
 568         int err = -EINVAL;
 569         struct nlattr *nest;
 570
 571         list_for_each_entry(a, actions, list) {
 572                 nest = nla_nest_start(skb, a->order);
 573                 if (nest == NULL)
 574                         goto nla_put_failure;
 575                 err = tcf_action_dump_1(skb, a, bind, ref);
 576                 if (err < 0)
 577                         goto errout;
 578                 nla_nest_end(skb, nest);
 579         }
 580
 581         return 0;
 582
 583 nla_put_failure:
 584         err = -EINVAL;
 585 errout:
 586         nla_nest_cancel(skb, nest);
 587         return err;
 588 }
 589
 590 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
 591 {
 592         struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
 593         if (!c)
 594                 return NULL;
 595
 596         c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
 597         if (!c->data) {
 598                 kfree(c);
 599                 return NULL;
 600         }
 601         c->len = nla_len(tb[TCA_ACT_COOKIE]);
 602
 603         return c;
 604 }
 605
 606 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 607                                     struct nlattr *nla, struct nlattr *est,
 608                                     char *name, int ovr, int bind)
 609 {
 610         struct tc_action *a;
 611         struct tc_action_ops *a_o;
 612         struct tc_cookie *cookie = NULL;
 613         char act_name[IFNAMSIZ];
 614         struct nlattr *tb[TCA_ACT_MAX + 1];
 615         struct nlattr *kind;
 616         int err;
 617
 618         if (name == NULL) {
 619                 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 620                 if (err < 0)
 621                         goto err_out;
 622                 err = -EINVAL;
 623                 kind = tb[TCA_ACT_KIND];
 624                 if (kind == NULL)
 625                         goto err_out;
 626                 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
 627                         goto err_out;
 628                 if (tb[TCA_ACT_COOKIE]) {
 629                         int cklen = nla_len(tb[TCA_ACT_COOKIE]);
 630
 631                         if (cklen > TC_COOKIE_MAX_SIZE)
 632                                 goto err_out;
 633
 634                         cookie = nla_memdup_cookie(tb);
 635                         if (!cookie) {
 636                                 err = -ENOMEM;
 637                                 goto err_out;
 638                         }
 639                 }
 640         } else {
 641                 err = -EINVAL;
 642                 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
 643                         goto err_out;
 644         }
 645
 646         a_o = tc_lookup_action_n(act_name);
 647         if (a_o == NULL) {
 648 #ifdef CONFIG_MODULES
 649                 rtnl_unlock();
 650                 request_module("act_%s", act_name);
 651                 rtnl_lock();
 652
 653                 a_o = tc_lookup_action_n(act_name);
 654
 655                 /* We dropped the RTNL semaphore in order to
 656                  * perform the module load.  So, even if we
 657                  * succeeded in loading the module we have to
 658                  * tell the caller to replay the request.  We
 659                  * indicate this using -EAGAIN.
 660                  */
 661                 if (a_o != NULL) {
 662                         err = -EAGAIN;
 663                         goto err_mod;
 664                 }
 665 #endif
 666                 err = -ENOENT;
 667                 goto err_out;
 668         }
 669
 670         /* backward compatibility for policer */
 671         if (name == NULL)
 672                 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
 673         else
 674                 err = a_o->init(net, nla, est, &a, ovr, bind);
 675         if (err < 0)
 676                 goto err_mod;
 677
 678         if (name == NULL && tb[TCA_ACT_COOKIE]) {
 679                 if (a->act_cookie) {
 680                         kfree(a->act_cookie->data);
 681                         kfree(a->act_cookie);
 682                 }
 683                 a->act_cookie = cookie;
 684         }
 685
 686         /* module count goes up only when brand new policy is created
 687          * if it exists and is only bound to in a_o->init() then
 688          * ACT_P_CREATED is not returned (a zero is).
 689          */
 690         if (err != ACT_P_CREATED)
 691                 module_put(a_o->owner);
 692
 693         if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
 694                 err = tcf_action_goto_chain_init(a, tp);
 695                 if (err) {
 696                         LIST_HEAD(actions);
 697
 698                         list_add_tail(&a->list, &actions);
 699                         tcf_action_destroy(&actions, bind);
 700                         return ERR_PTR(err);
 701                 }
 702         }
 703
 704         return a;
 705
 706 err_mod:
 707         module_put(a_o->owner);
 708 err_out:
 709         if (cookie) {
 710                 kfree(cookie->data);
 711                 kfree(cookie);
 712         }
 713         return ERR_PTR(err);
 714 }
 715
 716 static void cleanup_a(struct list_head *actions, int ovr)
 717 {
 718         struct tc_action *a;
 719
 720         if (!ovr)
 721                 return;
 722
 723         list_for_each_entry(a, actions, list)
 724                 a->tcfa_refcnt--;
 725 }
 726
 727 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 728                     struct nlattr *est, char *name, int ovr, int bind,
 729                     struct list_head *actions)
 730 {
 731         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
 732         struct tc_action *act;
 733         int err;
 734         int i;
 735
 736         err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
 737         if (err < 0)
 738                 return err;
 739
 740         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
 741                 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind);
 742                 if (IS_ERR(act)) {
 743                         err = PTR_ERR(act);
 744                         goto err;
 745                 }
 746                 act->order = i;
 747                 if (ovr)
 748                         act->tcfa_refcnt++;
 749                 list_add_tail(&act->list, actions);
 750         }
 751
 752         /* Remove the temp refcnt which was necessary to protect against
 753          * destroying an existing action which was being replaced
 754          */
 755         cleanup_a(actions, ovr);
 756         return 0;
 757
 758 err:
 759         tcf_action_destroy(actions, bind);
 760         return err;
 761 }
 762
 763 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
 764                           int compat_mode)
 765 {
 766         int err = 0;
 767         struct gnet_dump d;
 768
 769         if (p == NULL)
 770                 goto errout;
 771
 772         /* compat_mode being true specifies a call that is supposed
 773          * to add additional backward compatibility statistic TLVs.
 774          */
 775         if (compat_mode) {
 776                 if (p->type == TCA_OLD_COMPAT)
 777                         err = gnet_stats_start_copy_compat(skb, 0,
 778                                                            TCA_STATS,
 779                                                            TCA_XSTATS,
 780                                                            &p->tcfa_lock, &d,
 781                                                            TCA_PAD);
 782                 else
 783                         return 0;
 784         } else
 785                 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
 786                                             &p->tcfa_lock, &d, TCA_ACT_PAD);
 787
 788         if (err < 0)
 789                 goto errout;
 790
 791         if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
 792             gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
 793             gnet_stats_copy_queue(&d, p->cpu_qstats,
 794                                   &p->tcfa_qstats,
 795                                   p->tcfa_qstats.qlen) < 0)
 796                 goto errout;
 797
 798         if (gnet_stats_finish_copy(&d) < 0)
 799                 goto errout;
 800
 801         return 0;
 802
 803 errout:
 804         return -1;
 805 }
 806
 807 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
 808                         u32 portid, u32 seq, u16 flags, int event, int bind,
 809                         int ref)
 810 {
 811         struct tcamsg *t;
 812         struct nlmsghdr *nlh;
 813         unsigned char *b = skb_tail_pointer(skb);
 814         struct nlattr *nest;
 815
 816         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
 817         if (!nlh)
 818                 goto out_nlmsg_trim;
 819         t = nlmsg_data(nlh);
 820         t->tca_family = AF_UNSPEC;
 821         t->tca__pad1 = 0;
 822         t->tca__pad2 = 0;
 823
 824         nest = nla_nest_start(skb, TCA_ACT_TAB);
 825         if (nest == NULL)
 826                 goto out_nlmsg_trim;
 827
 828         if (tcf_action_dump(skb, actions, bind, ref) < 0)
 829                 goto out_nlmsg_trim;
 830
 831         nla_nest_end(skb, nest);
 832
 833         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 834         return skb->len;
 835
 836 out_nlmsg_trim:
 837         nlmsg_trim(skb, b);
 838         return -1;
 839 }
 840
 841 static int
 842 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
 843                struct list_head *actions, int event)
 844 {
 845         struct sk_buff *skb;
 846
 847         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 848         if (!skb)
 849                 return -ENOBUFS;
 850         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
 851                          0, 0) <= 0) {
 852                 kfree_skb(skb);
 853                 return -EINVAL;
 854         }
 855
 856         return rtnl_unicast(skb, net, portid);
 857 }
 858
 859 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
 860                                           struct nlmsghdr *n, u32 portid)
 861 {
 862         struct nlattr *tb[TCA_ACT_MAX + 1];
 863         const struct tc_action_ops *ops;
 864         struct tc_action *a;
 865         int index;
 866         int err;
 867
 868         err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 869         if (err < 0)
 870                 goto err_out;
 871
 872         err = -EINVAL;
 873         if (tb[TCA_ACT_INDEX] == NULL ||
 874             nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
 875                 goto err_out;
 876         index = nla_get_u32(tb[TCA_ACT_INDEX]);
 877
 878         err = -EINVAL;
 879         ops = tc_lookup_action(tb[TCA_ACT_KIND]);
 880         if (!ops) /* could happen in batch of actions */
 881                 goto err_out;
 882         err = -ENOENT;
 883         if (ops->lookup(net, &a, index) == 0)
 884                 goto err_mod;
 885
 886         module_put(ops->owner);
 887         return a;
 888
 889 err_mod:
 890         module_put(ops->owner);
 891 err_out:
 892         return ERR_PTR(err);
 893 }
 894
 895 static int tca_action_flush(struct net *net, struct nlattr *nla,
 896                             struct nlmsghdr *n, u32 portid)
 897 {
 898         struct sk_buff *skb;
 899         unsigned char *b;
 900         struct nlmsghdr *nlh;
 901         struct tcamsg *t;
 902         struct netlink_callback dcb;
 903         struct nlattr *nest;
 904         struct nlattr *tb[TCA_ACT_MAX + 1];
 905         const struct tc_action_ops *ops;
 906         struct nlattr *kind;
 907         int err = -ENOMEM;
 908
 909         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 910         if (!skb) {
 911                 pr_debug("tca_action_flush: failed skb alloc\n");
 912                 return err;
 913         }
 914
 915         b = skb_tail_pointer(skb);
 916
 917         err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
 918         if (err < 0)
 919                 goto err_out;
 920
 921         err = -EINVAL;
 922         kind = tb[TCA_ACT_KIND];
 923         ops = tc_lookup_action(kind);
 924         if (!ops) /*some idjot trying to flush unknown action */
 925                 goto err_out;
 926
 927         nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
 928                         sizeof(*t), 0);
 929         if (!nlh)
 930                 goto out_module_put;
 931         t = nlmsg_data(nlh);
 932         t->tca_family = AF_UNSPEC;
 933         t->tca__pad1 = 0;
 934         t->tca__pad2 = 0;
 935
 936         nest = nla_nest_start(skb, TCA_ACT_TAB);
 937         if (nest == NULL)
 938                 goto out_module_put;
 939
 940         err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
 941         if (err <= 0)
 942                 goto out_module_put;
 943
 944         nla_nest_end(skb, nest);
 945
 946         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 947         nlh->nlmsg_flags |= NLM_F_ROOT;
 948         module_put(ops->owner);
 949         err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
 950                              n->nlmsg_flags & NLM_F_ECHO);
 951         if (err > 0)
 952                 return 0;
 953
 954         return err;
 955
 956 out_module_put:
 957         module_put(ops->owner);
 958 err_out:
 959         kfree_skb(skb);
 960         return err;
 961 }
 962
 963 static int
 964 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
 965                u32 portid)
 966 {
 967         int ret;
 968         struct sk_buff *skb;
 969
 970         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 971         if (!skb)
 972                 return -ENOBUFS;
 973
 974         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
 975                          0, 1) <= 0) {
 976                 kfree_skb(skb);
 977                 return -EINVAL;
 978         }
 979
 980         /* now do the delete */
 981         ret = tcf_action_destroy(actions, 0);
 982         if (ret < 0) {
 983                 kfree_skb(skb);
 984                 return ret;
 985         }
 986
 987         ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
 988                              n->nlmsg_flags & NLM_F_ECHO);
 989         if (ret > 0)
 990                 return 0;
 991         return ret;
 992 }
 993
 994 static int
 995 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
 996               u32 portid, int event)
 997 {
 998         int i, ret;
 999         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1000         struct tc_action *act;
1001         LIST_HEAD(actions);
1002
1003         ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
1004         if (ret < 0)
1005                 return ret;
1006
1007         if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1008                 if (tb[1] != NULL)
1009                         return tca_action_flush(net, tb[1], n, portid);
1010                 else
1011                         return -EINVAL;
1012         }
1013
1014         for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1015                 act = tcf_action_get_1(net, tb[i], n, portid);
1016                 if (IS_ERR(act)) {
1017                         ret = PTR_ERR(act);
1018                         goto err;
1019                 }
1020                 act->order = i;
1021                 list_add_tail(&act->list, &actions);
1022         }
1023
1024         if (event == RTM_GETACTION)
1025                 ret = tcf_get_notify(net, portid, n, &actions, event);
1026         else { /* delete */
1027                 ret = tcf_del_notify(net, n, &actions, portid);
1028                 if (ret)
1029                         goto err;
1030                 return ret;
1031         }
1032 err:
1033         if (event != RTM_GETACTION)
1034                 tcf_action_destroy(&actions, 0);
1035         return ret;
1036 }
1037
1038 static int
1039 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1040                u32 portid)
1041 {
1042         struct sk_buff *skb;
1043         int err = 0;
1044
1045         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1046         if (!skb)
1047                 return -ENOBUFS;
1048
1049         if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1050                          RTM_NEWACTION, 0, 0) <= 0) {
1051                 kfree_skb(skb);
1052                 return -EINVAL;
1053         }
1054
1055         err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1056                              n->nlmsg_flags & NLM_F_ECHO);
1057         if (err > 0)
1058                 err = 0;
1059         return err;
1060 }
1061
1062 static int tcf_action_add(struct net *net, struct nlattr *nla,
1063                           struct nlmsghdr *n, u32 portid, int ovr)
1064 {
1065         int ret = 0;
1066         LIST_HEAD(actions);
1067
1068         ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions);
1069         if (ret)
1070                 return ret;
1071
1072         return tcf_add_notify(net, n, &actions, portid);
1073 }
1074
1075 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1076 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1077         [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1078                              .validation_data = &tcaa_root_flags_allowed },
1079         [TCA_ROOT_TIME_DELTA]      = { .type = NLA_U32 },
1080 };
1081
1082 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1083                          struct netlink_ext_ack *extack)
1084 {
1085         struct net *net = sock_net(skb->sk);
1086         struct nlattr *tca[TCA_ROOT_MAX + 1];
1087         u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1088         int ret = 0, ovr = 0;
1089
1090         if ((n->nlmsg_type != RTM_GETACTION) &&
1091             !netlink_capable(skb, CAP_NET_ADMIN))
1092                 return -EPERM;
1093
1094         ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1095                           extack);
1096         if (ret < 0)
1097                 return ret;
1098
1099         if (tca[TCA_ACT_TAB] == NULL) {
1100                 pr_notice("tc_ctl_action: received NO action attribs\n");
1101                 return -EINVAL;
1102         }
1103
1104         /* n->nlmsg_flags & NLM_F_CREATE */
1105         switch (n->nlmsg_type) {
1106         case RTM_NEWACTION:
1107                 /* we are going to assume all other flags
1108                  * imply create only if it doesn't exist
1109                  * Note that CREATE | EXCL implies that
1110                  * but since we want avoid ambiguity (eg when flags
1111                  * is zero) then just set this
1112                  */
1113                 if (n->nlmsg_flags & NLM_F_REPLACE)
1114                         ovr = 1;
1115 replay:
1116                 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1117                 if (ret == -EAGAIN)
1118                         goto replay;
1119                 break;
1120         case RTM_DELACTION:
1121                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1122                                     portid, RTM_DELACTION);
1123                 break;
1124         case RTM_GETACTION:
1125                 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1126                                     portid, RTM_GETACTION);
1127                 break;
1128         default:
1129                 BUG();
1130         }
1131
1132         return ret;
1133 }
1134
1135 static struct nlattr *find_dump_kind(struct nlattr **nla)
1136 {
1137         struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1138         struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1139         struct nlattr *kind;
1140
1141         tb1 = nla[TCA_ACT_TAB];
1142         if (tb1 == NULL)
1143                 return NULL;
1144
1145         if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1146                       NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1147                 return NULL;
1148
1149         if (tb[1] == NULL)
1150                 return NULL;
1151         if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1152                 return NULL;
1153         kind = tb2[TCA_ACT_KIND];
1154
1155         return kind;
1156 }
1157
1158 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1159 {
1160         struct net *net = sock_net(skb->sk);
1161         struct nlmsghdr *nlh;
1162         unsigned char *b = skb_tail_pointer(skb);
1163         struct nlattr *nest;
1164         struct tc_action_ops *a_o;
1165         int ret = 0;
1166         struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1167         struct nlattr *tb[TCA_ROOT_MAX + 1];
1168         struct nlattr *count_attr = NULL;
1169         unsigned long jiffy_since = 0;
1170         struct nlattr *kind = NULL;
1171         struct nla_bitfield32 bf;
1172         u32 msecs_since = 0;
1173         u32 act_count = 0;
1174
1175         ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1176                           tcaa_policy, NULL);
1177         if (ret < 0)
1178                 return ret;
1179
1180         kind = find_dump_kind(tb);
1181         if (kind == NULL) {
1182                 pr_info("tc_dump_action: action bad kind\n");
1183                 return 0;
1184         }
1185
1186         a_o = tc_lookup_action(kind);
1187         if (a_o == NULL)
1188                 return 0;
1189
1190         cb->args[2] = 0;
1191         if (tb[TCA_ROOT_FLAGS]) {
1192                 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1193                 cb->args[2] = bf.value;
1194         }
1195
1196         if (tb[TCA_ROOT_TIME_DELTA]) {
1197                 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1198         }
1199
1200         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1201                         cb->nlh->nlmsg_type, sizeof(*t), 0);
1202         if (!nlh)
1203                 goto out_module_put;
1204
1205         if (msecs_since)
1206                 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1207
1208         t = nlmsg_data(nlh);
1209         t->tca_family = AF_UNSPEC;
1210         t->tca__pad1 = 0;
1211         t->tca__pad2 = 0;
1212         cb->args[3] = jiffy_since;
1213         count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1214         if (!count_attr)
1215                 goto out_module_put;
1216
1217         nest = nla_nest_start(skb, TCA_ACT_TAB);
1218         if (nest == NULL)
1219                 goto out_module_put;
1220
1221         ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1222         if (ret < 0)
1223                 goto out_module_put;
1224
1225         if (ret > 0) {
1226                 nla_nest_end(skb, nest);
1227                 ret = skb->len;
1228                 act_count = cb->args[1];
1229                 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1230                 cb->args[1] = 0;
1231         } else
1232                 nlmsg_trim(skb, b);
1233
1234         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1235         if (NETLINK_CB(cb->skb).portid && ret)
1236                 nlh->nlmsg_flags |= NLM_F_MULTI;
1237         module_put(a_o->owner);
1238         return skb->len;
1239
1240 out_module_put:
1241         module_put(a_o->owner);
1242         nlmsg_trim(skb, b);
1243         return skb->len;
1244 }
1245
1246 struct tcf_action_net {
1247         struct rhashtable egdev_ht;
1248 };
1249
1250 static unsigned int tcf_action_net_id;
1251
1252 struct tcf_action_egdev_cb {
1253         struct list_head list;
1254         tc_setup_cb_t *cb;
1255         void *cb_priv;
1256 };
1257
1258 struct tcf_action_egdev {
1259         struct rhash_head ht_node;
1260         const struct net_device *dev;
1261         unsigned int refcnt;
1262         struct list_head cb_list;
1263 };
1264
1265 static const struct rhashtable_params tcf_action_egdev_ht_params = {
1266         .key_offset = offsetof(struct tcf_action_egdev, dev),
1267         .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1268         .key_len = sizeof(const struct net_device *),
1269 };
1270
1271 static struct tcf_action_egdev *
1272 tcf_action_egdev_lookup(const struct net_device *dev)
1273 {
1274         struct net *net = dev_net(dev);
1275         struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1276
1277         return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1278                                       tcf_action_egdev_ht_params);
1279 }
1280
1281 static struct tcf_action_egdev *
1282 tcf_action_egdev_get(const struct net_device *dev)
1283 {
1284         struct tcf_action_egdev *egdev;
1285         struct tcf_action_net *tan;
1286
1287         egdev = tcf_action_egdev_lookup(dev);
1288         if (egdev)
1289                 goto inc_ref;
1290
1291         egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1292         if (!egdev)
1293                 return NULL;
1294         INIT_LIST_HEAD(&egdev->cb_list);
1295         egdev->dev = dev;
1296         tan = net_generic(dev_net(dev), tcf_action_net_id);
1297         rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1298                                tcf_action_egdev_ht_params);
1299
1300 inc_ref:
1301         egdev->refcnt++;
1302         return egdev;
1303 }
1304
1305 static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1306 {
1307         struct tcf_action_net *tan;
1308
1309         if (--egdev->refcnt)
1310                 return;
1311         tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1312         rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1313                                tcf_action_egdev_ht_params);
1314         kfree(egdev);
1315 }
1316
1317 static struct tcf_action_egdev_cb *
1318 tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1319                            tc_setup_cb_t *cb, void *cb_priv)
1320 {
1321         struct tcf_action_egdev_cb *egdev_cb;
1322
1323         list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1324                 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1325                         return egdev_cb;
1326         return NULL;
1327 }
1328
1329 static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1330                                     enum tc_setup_type type,
1331                                     void *type_data, bool err_stop)
1332 {
1333         struct tcf_action_egdev_cb *egdev_cb;
1334         int ok_count = 0;
1335         int err;
1336
1337         list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1338                 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1339                 if (err) {
1340                         if (err_stop)
1341                                 return err;
1342                 } else {
1343                         ok_count++;
1344                 }
1345         }
1346         return ok_count;
1347 }
1348
1349 static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1350                                    tc_setup_cb_t *cb, void *cb_priv)
1351 {
1352         struct tcf_action_egdev_cb *egdev_cb;
1353
1354         egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1355         if (WARN_ON(egdev_cb))
1356                 return -EEXIST;
1357         egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1358         if (!egdev_cb)
1359                 return -ENOMEM;
1360         egdev_cb->cb = cb;
1361         egdev_cb->cb_priv = cb_priv;
1362         list_add(&egdev_cb->list, &egdev->cb_list);
1363         return 0;
1364 }
1365
1366 static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1367                                     tc_setup_cb_t *cb, void *cb_priv)
1368 {
1369         struct tcf_action_egdev_cb *egdev_cb;
1370
1371         egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1372         if (WARN_ON(!egdev_cb))
1373                 return;
1374         list_del(&egdev_cb->list);
1375         kfree(egdev_cb);
1376 }
1377
1378 static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1379                                         tc_setup_cb_t *cb, void *cb_priv)
1380 {
1381         struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1382         int err;
1383
1384         if (!egdev)
1385                 return -ENOMEM;
1386         err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1387         if (err)
1388                 goto err_cb_add;
1389         return 0;
1390
1391 err_cb_add:
1392         tcf_action_egdev_put(egdev);
1393         return err;
1394 }
1395 int tc_setup_cb_egdev_register(const struct net_device *dev,
1396                                tc_setup_cb_t *cb, void *cb_priv)
1397 {
1398         int err;
1399
1400         rtnl_lock();
1401         err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1402         rtnl_unlock();
1403         return err;
1404 }
1405 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1406
1407 static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1408                                            tc_setup_cb_t *cb, void *cb_priv)
1409 {
1410         struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1411
1412         if (WARN_ON(!egdev))
1413                 return;
1414         tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1415         tcf_action_egdev_put(egdev);
1416 }
1417 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1418                                   tc_setup_cb_t *cb, void *cb_priv)
1419 {
1420         rtnl_lock();
1421         __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1422         rtnl_unlock();
1423 }
1424 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1425
1426 int tc_setup_cb_egdev_call(const struct net_device *dev,
1427                            enum tc_setup_type type, void *type_data,
1428                            bool err_stop)
1429 {
1430         struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1431
1432         if (!egdev)
1433                 return 0;
1434         return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1435 }
1436 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1437
1438 static __net_init int tcf_action_net_init(struct net *net)
1439 {
1440         struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1441
1442         return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1443 }
1444
1445 static void __net_exit tcf_action_net_exit(struct net *net)
1446 {
1447         struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1448
1449         rhashtable_destroy(&tan->egdev_ht);
1450 }
1451
1452 static struct pernet_operations tcf_action_net_ops = {
1453         .init = tcf_action_net_init,
1454         .exit = tcf_action_net_exit,
1455         .id = &tcf_action_net_id,
1456         .size = sizeof(struct tcf_action_net),
1457 };
1458
1459 static int __init tc_action_init(void)
1460 {
1461         int err;
1462
1463         err = register_pernet_subsys(&tcf_action_net_ops);
1464         if (err)
1465                 return err;
1466
1467         rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1468         rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1469         rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1470                       0);
1471
1472         return 0;
1473 }
1474
1475 subsys_initcall(tc_action_init);