net/sched/cls_api.c

   1 /*
   2  * net/sched/cls_api.c  Packet classifier 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  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  * Changes:
  12  *
  13  * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/init.h>
  25 #include <linux/kmod.h>
  26 #include <linux/slab.h>
  27 #include <linux/idr.h>
  28 #include <linux/rhashtable.h>
  29 #include <net/net_namespace.h>
  30 #include <net/sock.h>
  31 #include <net/netlink.h>
  32 #include <net/pkt_sched.h>
  33 #include <net/pkt_cls.h>
  34 #include <net/tc_act/tc_pedit.h>
  35 #include <net/tc_act/tc_mirred.h>
  36 #include <net/tc_act/tc_vlan.h>
  37 #include <net/tc_act/tc_tunnel_key.h>
  38 #include <net/tc_act/tc_csum.h>
  39 #include <net/tc_act/tc_gact.h>
  40 #include <net/tc_act/tc_skbedit.h>
  41
  42 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
  43
  44 /* The list of all installed classifier types */
  45 static LIST_HEAD(tcf_proto_base);
  46
  47 /* Protects list of registered TC modules. It is pure SMP lock. */
  48 static DEFINE_RWLOCK(cls_mod_lock);
  49
  50 /* Find classifier type by string name */
  51
  52 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
  53 {
  54         const struct tcf_proto_ops *t, *res = NULL;
  55
  56         if (kind) {
  57                 read_lock(&cls_mod_lock);
  58                 list_for_each_entry(t, &tcf_proto_base, head) {
  59                         if (strcmp(kind, t->kind) == 0) {
  60                                 if (try_module_get(t->owner))
  61                                         res = t;
  62                                 break;
  63                         }
  64                 }
  65                 read_unlock(&cls_mod_lock);
  66         }
  67         return res;
  68 }
  69
  70 static const struct tcf_proto_ops *
  71 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
  72                      struct netlink_ext_ack *extack)
  73 {
  74         const struct tcf_proto_ops *ops;
  75
  76         ops = __tcf_proto_lookup_ops(kind);
  77         if (ops)
  78                 return ops;
  79 #ifdef CONFIG_MODULES
  80         if (rtnl_held)
  81                 rtnl_unlock();
  82         request_module("cls_%s", kind);
  83         if (rtnl_held)
  84                 rtnl_lock();
  85         ops = __tcf_proto_lookup_ops(kind);
  86         /* We dropped the RTNL semaphore in order to perform
  87          * the module load. So, even if we succeeded in loading
  88          * the module we have to replay the request. We indicate
  89          * this using -EAGAIN.
  90          */
  91         if (ops) {
  92                 module_put(ops->owner);
  93                 return ERR_PTR(-EAGAIN);
  94         }
  95 #endif
  96         NL_SET_ERR_MSG(extack, "TC classifier not found");
  97         return ERR_PTR(-ENOENT);
  98 }
  99
 100 /* Register(unregister) new classifier type */
 101
 102 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
 103 {
 104         struct tcf_proto_ops *t;
 105         int rc = -EEXIST;
 106
 107         write_lock(&cls_mod_lock);
 108         list_for_each_entry(t, &tcf_proto_base, head)
 109                 if (!strcmp(ops->kind, t->kind))
 110                         goto out;
 111
 112         list_add_tail(&ops->head, &tcf_proto_base);
 113         rc = 0;
 114 out:
 115         write_unlock(&cls_mod_lock);
 116         return rc;
 117 }
 118 EXPORT_SYMBOL(register_tcf_proto_ops);
 119
 120 static struct workqueue_struct *tc_filter_wq;
 121
 122 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
 123 {
 124         struct tcf_proto_ops *t;
 125         int rc = -ENOENT;
 126
 127         /* Wait for outstanding call_rcu()s, if any, from a
 128          * tcf_proto_ops's destroy() handler.
 129          */
 130         rcu_barrier();
 131         flush_workqueue(tc_filter_wq);
 132
 133         write_lock(&cls_mod_lock);
 134         list_for_each_entry(t, &tcf_proto_base, head) {
 135                 if (t == ops) {
 136                         list_del(&t->head);
 137                         rc = 0;
 138                         break;
 139                 }
 140         }
 141         write_unlock(&cls_mod_lock);
 142         return rc;
 143 }
 144 EXPORT_SYMBOL(unregister_tcf_proto_ops);
 145
 146 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
 147 {
 148         INIT_RCU_WORK(rwork, func);
 149         return queue_rcu_work(tc_filter_wq, rwork);
 150 }
 151 EXPORT_SYMBOL(tcf_queue_work);
 152
 153 /* Select new prio value from the range, managed by kernel. */
 154
 155 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
 156 {
 157         u32 first = TC_H_MAKE(0xC0000000U, 0U);
 158
 159         if (tp)
 160                 first = tp->prio - 1;
 161
 162         return TC_H_MAJ(first);
 163 }
 164
 165 static bool tcf_proto_is_unlocked(const char *kind)
 166 {
 167         const struct tcf_proto_ops *ops;
 168         bool ret;
 169
 170         ops = tcf_proto_lookup_ops(kind, false, NULL);
 171         /* On error return false to take rtnl lock. Proto lookup/create
 172          * functions will perform lookup again and properly handle errors.
 173          */
 174         if (IS_ERR(ops))
 175                 return false;
 176
 177         ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
 178         module_put(ops->owner);
 179         return ret;
 180 }
 181
 182 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
 183                                           u32 prio, struct tcf_chain *chain,
 184                                           bool rtnl_held,
 185                                           struct netlink_ext_ack *extack)
 186 {
 187         struct tcf_proto *tp;
 188         int err;
 189
 190         tp = kzalloc(sizeof(*tp), GFP_KERNEL);
 191         if (!tp)
 192                 return ERR_PTR(-ENOBUFS);
 193
 194         tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
 195         if (IS_ERR(tp->ops)) {
 196                 err = PTR_ERR(tp->ops);
 197                 goto errout;
 198         }
 199         tp->classify = tp->ops->classify;
 200         tp->protocol = protocol;
 201         tp->prio = prio;
 202         tp->chain = chain;
 203         spin_lock_init(&tp->lock);
 204         refcount_set(&tp->refcnt, 1);
 205
 206         err = tp->ops->init(tp);
 207         if (err) {
 208                 module_put(tp->ops->owner);
 209                 goto errout;
 210         }
 211         return tp;
 212
 213 errout:
 214         kfree(tp);
 215         return ERR_PTR(err);
 216 }
 217
 218 static void tcf_proto_get(struct tcf_proto *tp)
 219 {
 220         refcount_inc(&tp->refcnt);
 221 }
 222
 223 static void tcf_chain_put(struct tcf_chain *chain);
 224
 225 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
 226                               struct netlink_ext_ack *extack)
 227 {
 228         tp->ops->destroy(tp, rtnl_held, extack);
 229         tcf_chain_put(tp->chain);
 230         module_put(tp->ops->owner);
 231         kfree_rcu(tp, rcu);
 232 }
 233
 234 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
 235                           struct netlink_ext_ack *extack)
 236 {
 237         if (refcount_dec_and_test(&tp->refcnt))
 238                 tcf_proto_destroy(tp, rtnl_held, extack);
 239 }
 240
 241 static int walker_check_empty(struct tcf_proto *tp, void *fh,
 242                               struct tcf_walker *arg)
 243 {
 244         if (fh) {
 245                 arg->nonempty = true;
 246                 return -1;
 247         }
 248         return 0;
 249 }
 250
 251 static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held)
 252 {
 253         struct tcf_walker walker = { .fn = walker_check_empty, };
 254
 255         if (tp->ops->walk) {
 256                 tp->ops->walk(tp, &walker, rtnl_held);
 257                 return !walker.nonempty;
 258         }
 259         return true;
 260 }
 261
 262 static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held)
 263 {
 264         spin_lock(&tp->lock);
 265         if (tcf_proto_is_empty(tp, rtnl_held))
 266                 tp->deleting = true;
 267         spin_unlock(&tp->lock);
 268         return tp->deleting;
 269 }
 270
 271 static void tcf_proto_mark_delete(struct tcf_proto *tp)
 272 {
 273         spin_lock(&tp->lock);
 274         tp->deleting = true;
 275         spin_unlock(&tp->lock);
 276 }
 277
 278 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
 279 {
 280         bool deleting;
 281
 282         spin_lock(&tp->lock);
 283         deleting = tp->deleting;
 284         spin_unlock(&tp->lock);
 285
 286         return deleting;
 287 }
 288
 289 #define ASSERT_BLOCK_LOCKED(block)                                      \
 290         lockdep_assert_held(&(block)->lock)
 291
 292 struct tcf_filter_chain_list_item {
 293         struct list_head list;
 294         tcf_chain_head_change_t *chain_head_change;
 295         void *chain_head_change_priv;
 296 };
 297
 298 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
 299                                           u32 chain_index)
 300 {
 301         struct tcf_chain *chain;
 302
 303         ASSERT_BLOCK_LOCKED(block);
 304
 305         chain = kzalloc(sizeof(*chain), GFP_KERNEL);
 306         if (!chain)
 307                 return NULL;
 308         list_add_tail(&chain->list, &block->chain_list);
 309         mutex_init(&chain->filter_chain_lock);
 310         chain->block = block;
 311         chain->index = chain_index;
 312         chain->refcnt = 1;
 313         if (!chain->index)
 314                 block->chain0.chain = chain;
 315         return chain;
 316 }
 317
 318 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
 319                                        struct tcf_proto *tp_head)
 320 {
 321         if (item->chain_head_change)
 322                 item->chain_head_change(tp_head, item->chain_head_change_priv);
 323 }
 324
 325 static void tcf_chain0_head_change(struct tcf_chain *chain,
 326                                    struct tcf_proto *tp_head)
 327 {
 328         struct tcf_filter_chain_list_item *item;
 329         struct tcf_block *block = chain->block;
 330
 331         if (chain->index)
 332                 return;
 333
 334         mutex_lock(&block->lock);
 335         list_for_each_entry(item, &block->chain0.filter_chain_list, list)
 336                 tcf_chain_head_change_item(item, tp_head);
 337         mutex_unlock(&block->lock);
 338 }
 339
 340 /* Returns true if block can be safely freed. */
 341
 342 static bool tcf_chain_detach(struct tcf_chain *chain)
 343 {
 344         struct tcf_block *block = chain->block;
 345
 346         ASSERT_BLOCK_LOCKED(block);
 347
 348         list_del(&chain->list);
 349         if (!chain->index)
 350                 block->chain0.chain = NULL;
 351
 352         if (list_empty(&block->chain_list) &&
 353             refcount_read(&block->refcnt) == 0)
 354                 return true;
 355
 356         return false;
 357 }
 358
 359 static void tcf_block_destroy(struct tcf_block *block)
 360 {
 361         mutex_destroy(&block->lock);
 362         kfree_rcu(block, rcu);
 363 }
 364
 365 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
 366 {
 367         struct tcf_block *block = chain->block;
 368
 369         mutex_destroy(&chain->filter_chain_lock);
 370         kfree(chain);
 371         if (free_block)
 372                 tcf_block_destroy(block);
 373 }
 374
 375 static void tcf_chain_hold(struct tcf_chain *chain)
 376 {
 377         ASSERT_BLOCK_LOCKED(chain->block);
 378
 379         ++chain->refcnt;
 380 }
 381
 382 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
 383 {
 384         ASSERT_BLOCK_LOCKED(chain->block);
 385
 386         /* In case all the references are action references, this
 387          * chain should not be shown to the user.
 388          */
 389         return chain->refcnt == chain->action_refcnt;
 390 }
 391
 392 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
 393                                           u32 chain_index)
 394 {
 395         struct tcf_chain *chain;
 396
 397         ASSERT_BLOCK_LOCKED(block);
 398
 399         list_for_each_entry(chain, &block->chain_list, list) {
 400                 if (chain->index == chain_index)
 401                         return chain;
 402         }
 403         return NULL;
 404 }
 405
 406 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
 407                            u32 seq, u16 flags, int event, bool unicast);
 408
 409 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
 410                                          u32 chain_index, bool create,
 411                                          bool by_act)
 412 {
 413         struct tcf_chain *chain = NULL;
 414         bool is_first_reference;
 415
 416         mutex_lock(&block->lock);
 417         chain = tcf_chain_lookup(block, chain_index);
 418         if (chain) {
 419                 tcf_chain_hold(chain);
 420         } else {
 421                 if (!create)
 422                         goto errout;
 423                 chain = tcf_chain_create(block, chain_index);
 424                 if (!chain)
 425                         goto errout;
 426         }
 427
 428         if (by_act)
 429                 ++chain->action_refcnt;
 430         is_first_reference = chain->refcnt - chain->action_refcnt == 1;
 431         mutex_unlock(&block->lock);
 432
 433         /* Send notification only in case we got the first
 434          * non-action reference. Until then, the chain acts only as
 435          * a placeholder for actions pointing to it and user ought
 436          * not know about them.
 437          */
 438         if (is_first_reference && !by_act)
 439                 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
 440                                 RTM_NEWCHAIN, false);
 441
 442         return chain;
 443
 444 errout:
 445         mutex_unlock(&block->lock);
 446         return chain;
 447 }
 448
 449 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
 450                                        bool create)
 451 {
 452         return __tcf_chain_get(block, chain_index, create, false);
 453 }
 454
 455 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
 456 {
 457         return __tcf_chain_get(block, chain_index, true, true);
 458 }
 459 EXPORT_SYMBOL(tcf_chain_get_by_act);
 460
 461 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
 462                                void *tmplt_priv);
 463 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
 464                                   void *tmplt_priv, u32 chain_index,
 465                                   struct tcf_block *block, struct sk_buff *oskb,
 466                                   u32 seq, u16 flags, bool unicast);
 467
 468 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
 469                             bool explicitly_created)
 470 {
 471         struct tcf_block *block = chain->block;
 472         const struct tcf_proto_ops *tmplt_ops;
 473         bool free_block = false;
 474         unsigned int refcnt;
 475         void *tmplt_priv;
 476
 477         mutex_lock(&block->lock);
 478         if (explicitly_created) {
 479                 if (!chain->explicitly_created) {
 480                         mutex_unlock(&block->lock);
 481                         return;
 482                 }
 483                 chain->explicitly_created = false;
 484         }
 485
 486         if (by_act)
 487                 chain->action_refcnt--;
 488
 489         /* tc_chain_notify_delete can't be called while holding block lock.
 490          * However, when block is unlocked chain can be changed concurrently, so
 491          * save these to temporary variables.
 492          */
 493         refcnt = --chain->refcnt;
 494         tmplt_ops = chain->tmplt_ops;
 495         tmplt_priv = chain->tmplt_priv;
 496
 497         /* The last dropped non-action reference will trigger notification. */
 498         if (refcnt - chain->action_refcnt == 0 && !by_act) {
 499                 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
 500                                        block, NULL, 0, 0, false);
 501                 /* Last reference to chain, no need to lock. */
 502                 chain->flushing = false;
 503         }
 504
 505         if (refcnt == 0)
 506                 free_block = tcf_chain_detach(chain);
 507         mutex_unlock(&block->lock);
 508
 509         if (refcnt == 0) {
 510                 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
 511                 tcf_chain_destroy(chain, free_block);
 512         }
 513 }
 514
 515 static void tcf_chain_put(struct tcf_chain *chain)
 516 {
 517         __tcf_chain_put(chain, false, false);
 518 }
 519
 520 void tcf_chain_put_by_act(struct tcf_chain *chain)
 521 {
 522         __tcf_chain_put(chain, true, false);
 523 }
 524 EXPORT_SYMBOL(tcf_chain_put_by_act);
 525
 526 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
 527 {
 528         __tcf_chain_put(chain, false, true);
 529 }
 530
 531 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
 532 {
 533         struct tcf_proto *tp, *tp_next;
 534
 535         mutex_lock(&chain->filter_chain_lock);
 536         tp = tcf_chain_dereference(chain->filter_chain, chain);
 537         RCU_INIT_POINTER(chain->filter_chain, NULL);
 538         tcf_chain0_head_change(chain, NULL);
 539         chain->flushing = true;
 540         mutex_unlock(&chain->filter_chain_lock);
 541
 542         while (tp) {
 543                 tp_next = rcu_dereference_protected(tp->next, 1);
 544                 tcf_proto_put(tp, rtnl_held, NULL);
 545                 tp = tp_next;
 546         }
 547 }
 548
 549 static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
 550 {
 551         const struct Qdisc_class_ops *cops;
 552         struct Qdisc *qdisc;
 553
 554         if (!dev_ingress_queue(dev))
 555                 return NULL;
 556
 557         qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
 558         if (!qdisc)
 559                 return NULL;
 560
 561         cops = qdisc->ops->cl_ops;
 562         if (!cops)
 563                 return NULL;
 564
 565         if (!cops->tcf_block)
 566                 return NULL;
 567
 568         return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
 569 }
 570
 571 static struct rhashtable indr_setup_block_ht;
 572
 573 struct tc_indr_block_dev {
 574         struct rhash_head ht_node;
 575         struct net_device *dev;
 576         unsigned int refcnt;
 577         struct list_head cb_list;
 578         struct tcf_block *block;
 579 };
 580
 581 struct tc_indr_block_cb {
 582         struct list_head list;
 583         void *cb_priv;
 584         tc_indr_block_bind_cb_t *cb;
 585         void *cb_ident;
 586 };
 587
 588 static const struct rhashtable_params tc_indr_setup_block_ht_params = {
 589         .key_offset     = offsetof(struct tc_indr_block_dev, dev),
 590         .head_offset    = offsetof(struct tc_indr_block_dev, ht_node),
 591         .key_len        = sizeof(struct net_device *),
 592 };
 593
 594 static struct tc_indr_block_dev *
 595 tc_indr_block_dev_lookup(struct net_device *dev)
 596 {
 597         return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
 598                                       tc_indr_setup_block_ht_params);
 599 }
 600
 601 static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev)
 602 {
 603         struct tc_indr_block_dev *indr_dev;
 604
 605         indr_dev = tc_indr_block_dev_lookup(dev);
 606         if (indr_dev)
 607                 goto inc_ref;
 608
 609         indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
 610         if (!indr_dev)
 611                 return NULL;
 612
 613         INIT_LIST_HEAD(&indr_dev->cb_list);
 614         indr_dev->dev = dev;
 615         indr_dev->block = tc_dev_ingress_block(dev);
 616         if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
 617                                    tc_indr_setup_block_ht_params)) {
 618                 kfree(indr_dev);
 619                 return NULL;
 620         }
 621
 622 inc_ref:
 623         indr_dev->refcnt++;
 624         return indr_dev;
 625 }
 626
 627 static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev)
 628 {
 629         if (--indr_dev->refcnt)
 630                 return;
 631
 632         rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
 633                                tc_indr_setup_block_ht_params);
 634         kfree(indr_dev);
 635 }
 636
 637 static struct tc_indr_block_cb *
 638 tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev,
 639                         tc_indr_block_bind_cb_t *cb, void *cb_ident)
 640 {
 641         struct tc_indr_block_cb *indr_block_cb;
 642
 643         list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
 644                 if (indr_block_cb->cb == cb &&
 645                     indr_block_cb->cb_ident == cb_ident)
 646                         return indr_block_cb;
 647         return NULL;
 648 }
 649
 650 static struct tc_indr_block_cb *
 651 tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv,
 652                      tc_indr_block_bind_cb_t *cb, void *cb_ident)
 653 {
 654         struct tc_indr_block_cb *indr_block_cb;
 655
 656         indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
 657         if (indr_block_cb)
 658                 return ERR_PTR(-EEXIST);
 659
 660         indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
 661         if (!indr_block_cb)
 662                 return ERR_PTR(-ENOMEM);
 663
 664         indr_block_cb->cb_priv = cb_priv;
 665         indr_block_cb->cb = cb;
 666         indr_block_cb->cb_ident = cb_ident;
 667         list_add(&indr_block_cb->list, &indr_dev->cb_list);
 668
 669         return indr_block_cb;
 670 }
 671
 672 static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb)
 673 {
 674         list_del(&indr_block_cb->list);
 675         kfree(indr_block_cb);
 676 }
 677
 678 static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev,
 679                                   struct tc_indr_block_cb *indr_block_cb,
 680                                   enum tc_block_command command)
 681 {
 682         struct tc_block_offload bo = {
 683                 .command        = command,
 684                 .binder_type    = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
 685                 .block          = indr_dev->block,
 686         };
 687
 688         if (!indr_dev->block)
 689                 return;
 690
 691         indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
 692                           &bo);
 693 }
 694
 695 int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
 696                                 tc_indr_block_bind_cb_t *cb, void *cb_ident)
 697 {
 698         struct tc_indr_block_cb *indr_block_cb;
 699         struct tc_indr_block_dev *indr_dev;
 700         int err;
 701
 702         indr_dev = tc_indr_block_dev_get(dev);
 703         if (!indr_dev)
 704                 return -ENOMEM;
 705
 706         indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
 707         err = PTR_ERR_OR_ZERO(indr_block_cb);
 708         if (err)
 709                 goto err_dev_put;
 710
 711         tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND);
 712         return 0;
 713
 714 err_dev_put:
 715         tc_indr_block_dev_put(indr_dev);
 716         return err;
 717 }
 718 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register);
 719
 720 int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
 721                               tc_indr_block_bind_cb_t *cb, void *cb_ident)
 722 {
 723         int err;
 724
 725         rtnl_lock();
 726         err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
 727         rtnl_unlock();
 728
 729         return err;
 730 }
 731 EXPORT_SYMBOL_GPL(tc_indr_block_cb_register);
 732
 733 void __tc_indr_block_cb_unregister(struct net_device *dev,
 734                                    tc_indr_block_bind_cb_t *cb, void *cb_ident)
 735 {
 736         struct tc_indr_block_cb *indr_block_cb;
 737         struct tc_indr_block_dev *indr_dev;
 738
 739         indr_dev = tc_indr_block_dev_lookup(dev);
 740         if (!indr_dev)
 741                 return;
 742
 743         indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
 744         if (!indr_block_cb)
 745                 return;
 746
 747         /* Send unbind message if required to free any block cbs. */
 748         tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND);
 749         tc_indr_block_cb_del(indr_block_cb);
 750         tc_indr_block_dev_put(indr_dev);
 751 }
 752 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister);
 753
 754 void tc_indr_block_cb_unregister(struct net_device *dev,
 755                                  tc_indr_block_bind_cb_t *cb, void *cb_ident)
 756 {
 757         rtnl_lock();
 758         __tc_indr_block_cb_unregister(dev, cb, cb_ident);
 759         rtnl_unlock();
 760 }
 761 EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister);
 762
 763 static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
 764                                struct tcf_block_ext_info *ei,
 765                                enum tc_block_command command,
 766                                struct netlink_ext_ack *extack)
 767 {
 768         struct tc_indr_block_cb *indr_block_cb;
 769         struct tc_indr_block_dev *indr_dev;
 770         struct tc_block_offload bo = {
 771                 .command        = command,
 772                 .binder_type    = ei->binder_type,
 773                 .block          = block,
 774                 .extack         = extack,
 775         };
 776
 777         indr_dev = tc_indr_block_dev_lookup(dev);
 778         if (!indr_dev)
 779                 return;
 780
 781         indr_dev->block = command == TC_BLOCK_BIND ? block : NULL;
 782
 783         list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
 784                 indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
 785                                   &bo);
 786 }
 787
 788 static bool tcf_block_offload_in_use(struct tcf_block *block)
 789 {
 790         return block->offloadcnt;
 791 }
 792
 793 static int tcf_block_offload_cmd(struct tcf_block *block,
 794                                  struct net_device *dev,
 795                                  struct tcf_block_ext_info *ei,
 796                                  enum tc_block_command command,
 797                                  struct netlink_ext_ack *extack)
 798 {
 799         struct tc_block_offload bo = {};
 800
 801         bo.command = command;
 802         bo.binder_type = ei->binder_type;
 803         bo.block = block;
 804         bo.extack = extack;
 805         return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
 806 }
 807
 808 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
 809                                   struct tcf_block_ext_info *ei,
 810                                   struct netlink_ext_ack *extack)
 811 {
 812         struct net_device *dev = q->dev_queue->dev;
 813         int err;
 814
 815         if (!dev->netdev_ops->ndo_setup_tc)
 816                 goto no_offload_dev_inc;
 817
 818         /* If tc offload feature is disabled and the block we try to bind
 819          * to already has some offloaded filters, forbid to bind.
 820          */
 821         if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
 822                 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
 823                 return -EOPNOTSUPP;
 824         }
 825
 826         err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
 827         if (err == -EOPNOTSUPP)
 828                 goto no_offload_dev_inc;
 829         if (err)
 830                 return err;
 831
 832         tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
 833         return 0;
 834
 835 no_offload_dev_inc:
 836         if (tcf_block_offload_in_use(block))
 837                 return -EOPNOTSUPP;
 838         block->nooffloaddevcnt++;
 839         tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
 840         return 0;
 841 }
 842
 843 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
 844                                      struct tcf_block_ext_info *ei)
 845 {
 846         struct net_device *dev = q->dev_queue->dev;
 847         int err;
 848
 849         tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL);
 850
 851         if (!dev->netdev_ops->ndo_setup_tc)
 852                 goto no_offload_dev_dec;
 853         err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
 854         if (err == -EOPNOTSUPP)
 855                 goto no_offload_dev_dec;
 856         return;
 857
 858 no_offload_dev_dec:
 859         WARN_ON(block->nooffloaddevcnt-- == 0);
 860 }
 861
 862 static int
 863 tcf_chain0_head_change_cb_add(struct tcf_block *block,
 864                               struct tcf_block_ext_info *ei,
 865                               struct netlink_ext_ack *extack)
 866 {
 867         struct tcf_filter_chain_list_item *item;
 868         struct tcf_chain *chain0;
 869
 870         item = kmalloc(sizeof(*item), GFP_KERNEL);
 871         if (!item) {
 872                 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
 873                 return -ENOMEM;
 874         }
 875         item->chain_head_change = ei->chain_head_change;
 876         item->chain_head_change_priv = ei->chain_head_change_priv;
 877
 878         mutex_lock(&block->lock);
 879         chain0 = block->chain0.chain;
 880         if (chain0)
 881                 tcf_chain_hold(chain0);
 882         else
 883                 list_add(&item->list, &block->chain0.filter_chain_list);
 884         mutex_unlock(&block->lock);
 885
 886         if (chain0) {
 887                 struct tcf_proto *tp_head;
 888
 889                 mutex_lock(&chain0->filter_chain_lock);
 890
 891                 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
 892                 if (tp_head)
 893                         tcf_chain_head_change_item(item, tp_head);
 894
 895                 mutex_lock(&block->lock);
 896                 list_add(&item->list, &block->chain0.filter_chain_list);
 897                 mutex_unlock(&block->lock);
 898
 899                 mutex_unlock(&chain0->filter_chain_lock);
 900                 tcf_chain_put(chain0);
 901         }
 902
 903         return 0;
 904 }
 905
 906 static void
 907 tcf_chain0_head_change_cb_del(struct tcf_block *block,
 908                               struct tcf_block_ext_info *ei)
 909 {
 910         struct tcf_filter_chain_list_item *item;
 911
 912         mutex_lock(&block->lock);
 913         list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
 914                 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
 915                     (item->chain_head_change == ei->chain_head_change &&
 916                      item->chain_head_change_priv == ei->chain_head_change_priv)) {
 917                         if (block->chain0.chain)
 918                                 tcf_chain_head_change_item(item, NULL);
 919                         list_del(&item->list);
 920                         mutex_unlock(&block->lock);
 921
 922                         kfree(item);
 923                         return;
 924                 }
 925         }
 926         mutex_unlock(&block->lock);
 927         WARN_ON(1);
 928 }
 929
 930 struct tcf_net {
 931         spinlock_t idr_lock; /* Protects idr */
 932         struct idr idr;
 933 };
 934
 935 static unsigned int tcf_net_id;
 936
 937 static int tcf_block_insert(struct tcf_block *block, struct net *net,
 938                             struct netlink_ext_ack *extack)
 939 {
 940         struct tcf_net *tn = net_generic(net, tcf_net_id);
 941         int err;
 942
 943         idr_preload(GFP_KERNEL);
 944         spin_lock(&tn->idr_lock);
 945         err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
 946                             GFP_NOWAIT);
 947         spin_unlock(&tn->idr_lock);
 948         idr_preload_end();
 949
 950         return err;
 951 }
 952
 953 static void tcf_block_remove(struct tcf_block *block, struct net *net)
 954 {
 955         struct tcf_net *tn = net_generic(net, tcf_net_id);
 956
 957         spin_lock(&tn->idr_lock);
 958         idr_remove(&tn->idr, block->index);
 959         spin_unlock(&tn->idr_lock);
 960 }
 961
 962 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
 963                                           u32 block_index,
 964                                           struct netlink_ext_ack *extack)
 965 {
 966         struct tcf_block *block;
 967
 968         block = kzalloc(sizeof(*block), GFP_KERNEL);
 969         if (!block) {
 970                 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
 971                 return ERR_PTR(-ENOMEM);
 972         }
 973         mutex_init(&block->lock);
 974         INIT_LIST_HEAD(&block->chain_list);
 975         INIT_LIST_HEAD(&block->cb_list);
 976         INIT_LIST_HEAD(&block->owner_list);
 977         INIT_LIST_HEAD(&block->chain0.filter_chain_list);
 978
 979         refcount_set(&block->refcnt, 1);
 980         block->net = net;
 981         block->index = block_index;
 982
 983         /* Don't store q pointer for blocks which are shared */
 984         if (!tcf_block_shared(block))
 985                 block->q = q;
 986         return block;
 987 }
 988
 989 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
 990 {
 991         struct tcf_net *tn = net_generic(net, tcf_net_id);
 992
 993         return idr_find(&tn->idr, block_index);
 994 }
 995
 996 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
 997 {
 998         struct tcf_block *block;
 999
1000         rcu_read_lock();
1001         block = tcf_block_lookup(net, block_index);
1002         if (block && !refcount_inc_not_zero(&block->refcnt))
1003                 block = NULL;
1004         rcu_read_unlock();
1005
1006         return block;
1007 }
1008
1009 static struct tcf_chain *
1010 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1011 {
1012         mutex_lock(&block->lock);
1013         if (chain)
1014                 chain = list_is_last(&chain->list, &block->chain_list) ?
1015                         NULL : list_next_entry(chain, list);
1016         else
1017                 chain = list_first_entry_or_null(&block->chain_list,
1018                                                  struct tcf_chain, list);
1019
1020         /* skip all action-only chains */
1021         while (chain && tcf_chain_held_by_acts_only(chain))
1022                 chain = list_is_last(&chain->list, &block->chain_list) ?
1023                         NULL : list_next_entry(chain, list);
1024
1025         if (chain)
1026                 tcf_chain_hold(chain);
1027         mutex_unlock(&block->lock);
1028
1029         return chain;
1030 }
1031
1032 /* Function to be used by all clients that want to iterate over all chains on
1033  * block. It properly obtains block->lock and takes reference to chain before
1034  * returning it. Users of this function must be tolerant to concurrent chain
1035  * insertion/deletion or ensure that no concurrent chain modification is
1036  * possible. Note that all netlink dump callbacks cannot guarantee to provide
1037  * consistent dump because rtnl lock is released each time skb is filled with
1038  * data and sent to user-space.
1039  */
1040
1041 struct tcf_chain *
1042 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1043 {
1044         struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1045
1046         if (chain)
1047                 tcf_chain_put(chain);
1048
1049         return chain_next;
1050 }
1051 EXPORT_SYMBOL(tcf_get_next_chain);
1052
1053 static struct tcf_proto *
1054 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1055 {
1056         u32 prio = 0;
1057
1058         ASSERT_RTNL();
1059         mutex_lock(&chain->filter_chain_lock);
1060
1061         if (!tp) {
1062                 tp = tcf_chain_dereference(chain->filter_chain, chain);
1063         } else if (tcf_proto_is_deleting(tp)) {
1064                 /* 'deleting' flag is set and chain->filter_chain_lock was
1065                  * unlocked, which means next pointer could be invalid. Restart
1066                  * search.
1067                  */
1068                 prio = tp->prio + 1;
1069                 tp = tcf_chain_dereference(chain->filter_chain, chain);
1070
1071                 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1072                         if (!tp->deleting && tp->prio >= prio)
1073                                 break;
1074         } else {
1075                 tp = tcf_chain_dereference(tp->next, chain);
1076         }
1077
1078         if (tp)
1079                 tcf_proto_get(tp);
1080
1081         mutex_unlock(&chain->filter_chain_lock);
1082
1083         return tp;
1084 }
1085
1086 /* Function to be used by all clients that want to iterate over all tp's on
1087  * chain. Users of this function must be tolerant to concurrent tp
1088  * insertion/deletion or ensure that no concurrent chain modification is
1089  * possible. Note that all netlink dump callbacks cannot guarantee to provide
1090  * consistent dump because rtnl lock is released each time skb is filled with
1091  * data and sent to user-space.
1092  */
1093
1094 struct tcf_proto *
1095 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
1096                    bool rtnl_held)
1097 {
1098         struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1099
1100         if (tp)
1101                 tcf_proto_put(tp, rtnl_held, NULL);
1102
1103         return tp_next;
1104 }
1105 EXPORT_SYMBOL(tcf_get_next_proto);
1106
1107 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1108 {
1109         struct tcf_chain *chain;
1110
1111         /* Last reference to block. At this point chains cannot be added or
1112          * removed concurrently.
1113          */
1114         for (chain = tcf_get_next_chain(block, NULL);
1115              chain;
1116              chain = tcf_get_next_chain(block, chain)) {
1117                 tcf_chain_put_explicitly_created(chain);
1118                 tcf_chain_flush(chain, rtnl_held);
1119         }
1120 }
1121
1122 /* Lookup Qdisc and increments its reference counter.
1123  * Set parent, if necessary.
1124  */
1125
1126 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1127                             u32 *parent, int ifindex, bool rtnl_held,
1128                             struct netlink_ext_ack *extack)
1129 {
1130         const struct Qdisc_class_ops *cops;
1131         struct net_device *dev;
1132         int err = 0;
1133
1134         if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1135                 return 0;
1136
1137         rcu_read_lock();
1138
1139         /* Find link */
1140         dev = dev_get_by_index_rcu(net, ifindex);
1141         if (!dev) {
1142                 rcu_read_unlock();
1143                 return -ENODEV;
1144         }
1145
1146         /* Find qdisc */
1147         if (!*parent) {
1148                 *q = dev->qdisc;
1149                 *parent = (*q)->handle;
1150         } else {
1151                 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1152                 if (!*q) {
1153                         NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1154                         err = -EINVAL;
1155                         goto errout_rcu;
1156                 }
1157         }
1158
1159         *q = qdisc_refcount_inc_nz(*q);
1160         if (!*q) {
1161                 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1162                 err = -EINVAL;
1163                 goto errout_rcu;
1164         }
1165
1166         /* Is it classful? */
1167         cops = (*q)->ops->cl_ops;
1168         if (!cops) {
1169                 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1170                 err = -EINVAL;
1171                 goto errout_qdisc;
1172         }
1173
1174         if (!cops->tcf_block) {
1175                 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1176                 err = -EOPNOTSUPP;
1177                 goto errout_qdisc;
1178         }
1179
1180 errout_rcu:
1181         /* At this point we know that qdisc is not noop_qdisc,
1182          * which means that qdisc holds a reference to net_device
1183          * and we hold a reference to qdisc, so it is safe to release
1184          * rcu read lock.
1185          */
1186         rcu_read_unlock();
1187         return err;
1188
1189 errout_qdisc:
1190         rcu_read_unlock();
1191
1192         if (rtnl_held)
1193                 qdisc_put(*q);
1194         else
1195                 qdisc_put_unlocked(*q);
1196         *q = NULL;
1197
1198         return err;
1199 }
1200
1201 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1202                                int ifindex, struct netlink_ext_ack *extack)
1203 {
1204         if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1205                 return 0;
1206
1207         /* Do we search for filter, attached to class? */
1208         if (TC_H_MIN(parent)) {
1209                 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1210
1211                 *cl = cops->find(q, parent);
1212                 if (*cl == 0) {
1213                         NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1214                         return -ENOENT;
1215                 }
1216         }
1217
1218         return 0;
1219 }
1220
1221 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1222                                           unsigned long cl, int ifindex,
1223                                           u32 block_index,
1224                                           struct netlink_ext_ack *extack)
1225 {
1226         struct tcf_block *block;
1227
1228         if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1229                 block = tcf_block_refcnt_get(net, block_index);
1230                 if (!block) {
1231                         NL_SET_ERR_MSG(extack, "Block of given index was not found");
1232                         return ERR_PTR(-EINVAL);
1233                 }
1234         } else {
1235                 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1236
1237                 block = cops->tcf_block(q, cl, extack);
1238                 if (!block)
1239                         return ERR_PTR(-EINVAL);
1240
1241                 if (tcf_block_shared(block)) {
1242                         NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1243                         return ERR_PTR(-EOPNOTSUPP);
1244                 }
1245
1246                 /* Always take reference to block in order to support execution
1247                  * of rules update path of cls API without rtnl lock. Caller
1248                  * must release block when it is finished using it. 'if' block
1249                  * of this conditional obtain reference to block by calling
1250                  * tcf_block_refcnt_get().
1251                  */
1252                 refcount_inc(&block->refcnt);
1253         }
1254
1255         return block;
1256 }
1257
1258 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1259                             struct tcf_block_ext_info *ei, bool rtnl_held)
1260 {
1261         if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1262                 /* Flushing/putting all chains will cause the block to be
1263                  * deallocated when last chain is freed. However, if chain_list
1264                  * is empty, block has to be manually deallocated. After block
1265                  * reference counter reached 0, it is no longer possible to
1266                  * increment it or add new chains to block.
1267                  */
1268                 bool free_block = list_empty(&block->chain_list);
1269
1270                 mutex_unlock(&block->lock);
1271                 if (tcf_block_shared(block))
1272                         tcf_block_remove(block, block->net);
1273
1274                 if (q)
1275                         tcf_block_offload_unbind(block, q, ei);
1276
1277                 if (free_block)
1278                         tcf_block_destroy(block);
1279                 else
1280                         tcf_block_flush_all_chains(block, rtnl_held);
1281         } else if (q) {
1282                 tcf_block_offload_unbind(block, q, ei);
1283         }
1284 }
1285
1286 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1287 {
1288         __tcf_block_put(block, NULL, NULL, rtnl_held);
1289 }
1290
1291 /* Find tcf block.
1292  * Set q, parent, cl when appropriate.
1293  */
1294
1295 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1296                                         u32 *parent, unsigned long *cl,
1297                                         int ifindex, u32 block_index,
1298                                         struct netlink_ext_ack *extack)
1299 {
1300         struct tcf_block *block;
1301         int err = 0;
1302
1303         ASSERT_RTNL();
1304
1305         err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1306         if (err)
1307                 goto errout;
1308
1309         err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1310         if (err)
1311                 goto errout_qdisc;
1312
1313         block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1314         if (IS_ERR(block)) {
1315                 err = PTR_ERR(block);
1316                 goto errout_qdisc;
1317         }
1318
1319         return block;
1320
1321 errout_qdisc:
1322         if (*q)
1323                 qdisc_put(*q);
1324 errout:
1325         *q = NULL;
1326         return ERR_PTR(err);
1327 }
1328
1329 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1330                               bool rtnl_held)
1331 {
1332         if (!IS_ERR_OR_NULL(block))
1333                 tcf_block_refcnt_put(block, rtnl_held);
1334
1335         if (q) {
1336                 if (rtnl_held)
1337                         qdisc_put(q);
1338                 else
1339                         qdisc_put_unlocked(q);
1340         }
1341 }
1342
1343 struct tcf_block_owner_item {
1344         struct list_head list;
1345         struct Qdisc *q;
1346         enum tcf_block_binder_type binder_type;
1347 };
1348
1349 static void
1350 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1351                                struct Qdisc *q,
1352                                enum tcf_block_binder_type binder_type)
1353 {
1354         if (block->keep_dst &&
1355             binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1356             binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1357                 netif_keep_dst(qdisc_dev(q));
1358 }
1359
1360 void tcf_block_netif_keep_dst(struct tcf_block *block)
1361 {
1362         struct tcf_block_owner_item *item;
1363
1364         block->keep_dst = true;
1365         list_for_each_entry(item, &block->owner_list, list)
1366                 tcf_block_owner_netif_keep_dst(block, item->q,
1367                                                item->binder_type);
1368 }
1369 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1370
1371 static int tcf_block_owner_add(struct tcf_block *block,
1372                                struct Qdisc *q,
1373                                enum tcf_block_binder_type binder_type)
1374 {
1375         struct tcf_block_owner_item *item;
1376
1377         item = kmalloc(sizeof(*item), GFP_KERNEL);
1378         if (!item)
1379                 return -ENOMEM;
1380         item->q = q;
1381         item->binder_type = binder_type;
1382         list_add(&item->list, &block->owner_list);
1383         return 0;
1384 }
1385
1386 static void tcf_block_owner_del(struct tcf_block *block,
1387                                 struct Qdisc *q,
1388                                 enum tcf_block_binder_type binder_type)
1389 {
1390         struct tcf_block_owner_item *item;
1391
1392         list_for_each_entry(item, &block->owner_list, list) {
1393                 if (item->q == q && item->binder_type == binder_type) {
1394                         list_del(&item->list);
1395                         kfree(item);
1396                         return;
1397                 }
1398         }
1399         WARN_ON(1);
1400 }
1401
1402 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1403                       struct tcf_block_ext_info *ei,
1404                       struct netlink_ext_ack *extack)
1405 {
1406         struct net *net = qdisc_net(q);
1407         struct tcf_block *block = NULL;
1408         int err;
1409
1410         if (ei->block_index)
1411                 /* block_index not 0 means the shared block is requested */
1412                 block = tcf_block_refcnt_get(net, ei->block_index);
1413
1414         if (!block) {
1415                 block = tcf_block_create(net, q, ei->block_index, extack);
1416                 if (IS_ERR(block))
1417                         return PTR_ERR(block);
1418                 if (tcf_block_shared(block)) {
1419                         err = tcf_block_insert(block, net, extack);
1420                         if (err)
1421                                 goto err_block_insert;
1422                 }
1423         }
1424
1425         err = tcf_block_owner_add(block, q, ei->binder_type);
1426         if (err)
1427                 goto err_block_owner_add;
1428
1429         tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1430
1431         err = tcf_chain0_head_change_cb_add(block, ei, extack);
1432         if (err)
1433                 goto err_chain0_head_change_cb_add;
1434
1435         err = tcf_block_offload_bind(block, q, ei, extack);
1436         if (err)
1437                 goto err_block_offload_bind;
1438
1439         *p_block = block;
1440         return 0;
1441
1442 err_block_offload_bind:
1443         tcf_chain0_head_change_cb_del(block, ei);
1444 err_chain0_head_change_cb_add:
1445         tcf_block_owner_del(block, q, ei->binder_type);
1446 err_block_owner_add:
1447 err_block_insert:
1448         tcf_block_refcnt_put(block, true);
1449         return err;
1450 }
1451 EXPORT_SYMBOL(tcf_block_get_ext);
1452
1453 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1454 {
1455         struct tcf_proto __rcu **p_filter_chain = priv;
1456
1457         rcu_assign_pointer(*p_filter_chain, tp_head);
1458 }
1459
1460 int tcf_block_get(struct tcf_block **p_block,
1461                   struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1462                   struct netlink_ext_ack *extack)
1463 {
1464         struct tcf_block_ext_info ei = {
1465                 .chain_head_change = tcf_chain_head_change_dflt,
1466                 .chain_head_change_priv = p_filter_chain,
1467         };
1468
1469         WARN_ON(!p_filter_chain);
1470         return tcf_block_get_ext(p_block, q, &ei, extack);
1471 }
1472 EXPORT_SYMBOL(tcf_block_get);
1473
1474 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1475  * actions should be all removed after flushing.
1476  */
1477 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1478                        struct tcf_block_ext_info *ei)
1479 {
1480         if (!block)
1481                 return;
1482         tcf_chain0_head_change_cb_del(block, ei);
1483         tcf_block_owner_del(block, q, ei->binder_type);
1484
1485         __tcf_block_put(block, q, ei, true);
1486 }
1487 EXPORT_SYMBOL(tcf_block_put_ext);
1488
1489 void tcf_block_put(struct tcf_block *block)
1490 {
1491         struct tcf_block_ext_info ei = {0, };
1492
1493         if (!block)
1494                 return;
1495         tcf_block_put_ext(block, block->q, &ei);
1496 }
1497
1498 EXPORT_SYMBOL(tcf_block_put);
1499
1500 struct tcf_block_cb {
1501         struct list_head list;
1502         tc_setup_cb_t *cb;
1503         void *cb_ident;
1504         void *cb_priv;
1505         unsigned int refcnt;
1506 };
1507
1508 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
1509 {
1510         return block_cb->cb_priv;
1511 }
1512 EXPORT_SYMBOL(tcf_block_cb_priv);
1513
1514 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
1515                                          tc_setup_cb_t *cb, void *cb_ident)
1516 {       struct tcf_block_cb *block_cb;
1517
1518         list_for_each_entry(block_cb, &block->cb_list, list)
1519                 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
1520                         return block_cb;
1521         return NULL;
1522 }
1523 EXPORT_SYMBOL(tcf_block_cb_lookup);
1524
1525 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
1526 {
1527         block_cb->refcnt++;
1528 }
1529 EXPORT_SYMBOL(tcf_block_cb_incref);
1530
1531 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
1532 {
1533         return --block_cb->refcnt;
1534 }
1535 EXPORT_SYMBOL(tcf_block_cb_decref);
1536
1537 static int
1538 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
1539                             void *cb_priv, bool add, bool offload_in_use,
1540                             struct netlink_ext_ack *extack)
1541 {
1542         struct tcf_chain *chain, *chain_prev;
1543         struct tcf_proto *tp, *tp_prev;
1544         int err;
1545
1546         for (chain = __tcf_get_next_chain(block, NULL);
1547              chain;
1548              chain_prev = chain,
1549                      chain = __tcf_get_next_chain(block, chain),
1550                      tcf_chain_put(chain_prev)) {
1551                 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1552                      tp_prev = tp,
1553                              tp = __tcf_get_next_proto(chain, tp),
1554                              tcf_proto_put(tp_prev, true, NULL)) {
1555                         if (tp->ops->reoffload) {
1556                                 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1557                                                          extack);
1558                                 if (err && add)
1559                                         goto err_playback_remove;
1560                         } else if (add && offload_in_use) {
1561                                 err = -EOPNOTSUPP;
1562                                 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1563                                 goto err_playback_remove;
1564                         }
1565                 }
1566         }
1567
1568         return 0;
1569
1570 err_playback_remove:
1571         tcf_proto_put(tp, true, NULL);
1572         tcf_chain_put(chain);
1573         tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1574                                     extack);
1575         return err;
1576 }
1577
1578 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
1579                                              tc_setup_cb_t *cb, void *cb_ident,
1580                                              void *cb_priv,
1581                                              struct netlink_ext_ack *extack)
1582 {
1583         struct tcf_block_cb *block_cb;
1584         int err;
1585
1586         /* Replay any already present rules */
1587         err = tcf_block_playback_offloads(block, cb, cb_priv, true,
1588                                           tcf_block_offload_in_use(block),
1589                                           extack);
1590         if (err)
1591                 return ERR_PTR(err);
1592
1593         block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
1594         if (!block_cb)
1595                 return ERR_PTR(-ENOMEM);
1596         block_cb->cb = cb;
1597         block_cb->cb_ident = cb_ident;
1598         block_cb->cb_priv = cb_priv;
1599         list_add(&block_cb->list, &block->cb_list);
1600         return block_cb;
1601 }
1602 EXPORT_SYMBOL(__tcf_block_cb_register);
1603
1604 int tcf_block_cb_register(struct tcf_block *block,
1605                           tc_setup_cb_t *cb, void *cb_ident,
1606                           void *cb_priv, struct netlink_ext_ack *extack)
1607 {
1608         struct tcf_block_cb *block_cb;
1609
1610         block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
1611                                            extack);
1612         return PTR_ERR_OR_ZERO(block_cb);
1613 }
1614 EXPORT_SYMBOL(tcf_block_cb_register);
1615
1616 void __tcf_block_cb_unregister(struct tcf_block *block,
1617                                struct tcf_block_cb *block_cb)
1618 {
1619         tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
1620                                     false, tcf_block_offload_in_use(block),
1621                                     NULL);
1622         list_del(&block_cb->list);
1623         kfree(block_cb);
1624 }
1625 EXPORT_SYMBOL(__tcf_block_cb_unregister);
1626
1627 void tcf_block_cb_unregister(struct tcf_block *block,
1628                              tc_setup_cb_t *cb, void *cb_ident)
1629 {
1630         struct tcf_block_cb *block_cb;
1631
1632         block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
1633         if (!block_cb)
1634                 return;
1635         __tcf_block_cb_unregister(block, block_cb);
1636 }
1637 EXPORT_SYMBOL(tcf_block_cb_unregister);
1638
1639 /* Main classifier routine: scans classifier chain attached
1640  * to this qdisc, (optionally) tests for protocol and asks
1641  * specific classifiers.
1642  */
1643 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1644                  struct tcf_result *res, bool compat_mode)
1645 {
1646 #ifdef CONFIG_NET_CLS_ACT
1647         const int max_reclassify_loop = 4;
1648         const struct tcf_proto *orig_tp = tp;
1649         const struct tcf_proto *first_tp;
1650         int limit = 0;
1651
1652 reclassify:
1653 #endif
1654         for (; tp; tp = rcu_dereference_bh(tp->next)) {
1655                 __be16 protocol = tc_skb_protocol(skb);
1656                 int err;
1657
1658                 if (tp->protocol != protocol &&
1659                     tp->protocol != htons(ETH_P_ALL))
1660                         continue;
1661
1662                 err = tp->classify(skb, tp, res);
1663 #ifdef CONFIG_NET_CLS_ACT
1664                 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1665                         first_tp = orig_tp;
1666                         goto reset;
1667                 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1668                         first_tp = res->goto_tp;
1669                         goto reset;
1670                 }
1671 #endif
1672                 if (err >= 0)
1673                         return err;
1674         }
1675
1676         return TC_ACT_UNSPEC; /* signal: continue lookup */
1677 #ifdef CONFIG_NET_CLS_ACT
1678 reset:
1679         if (unlikely(limit++ >= max_reclassify_loop)) {
1680                 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1681                                        tp->chain->block->index,
1682                                        tp->prio & 0xffff,
1683                                        ntohs(tp->protocol));
1684                 return TC_ACT_SHOT;
1685         }
1686
1687         tp = first_tp;
1688         goto reclassify;
1689 #endif
1690 }
1691 EXPORT_SYMBOL(tcf_classify);
1692
1693 struct tcf_chain_info {
1694         struct tcf_proto __rcu **pprev;
1695         struct tcf_proto __rcu *next;
1696 };
1697
1698 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1699                                            struct tcf_chain_info *chain_info)
1700 {
1701         return tcf_chain_dereference(*chain_info->pprev, chain);
1702 }
1703
1704 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1705                                struct tcf_chain_info *chain_info,
1706                                struct tcf_proto *tp)
1707 {
1708         if (chain->flushing)
1709                 return -EAGAIN;
1710
1711         if (*chain_info->pprev == chain->filter_chain)
1712                 tcf_chain0_head_change(chain, tp);
1713         tcf_proto_get(tp);
1714         RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1715         rcu_assign_pointer(*chain_info->pprev, tp);
1716
1717         return 0;
1718 }
1719
1720 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1721                                 struct tcf_chain_info *chain_info,
1722                                 struct tcf_proto *tp)
1723 {
1724         struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1725
1726         tcf_proto_mark_delete(tp);
1727         if (tp == chain->filter_chain)
1728                 tcf_chain0_head_change(chain, next);
1729         RCU_INIT_POINTER(*chain_info->pprev, next);
1730 }
1731
1732 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1733                                            struct tcf_chain_info *chain_info,
1734                                            u32 protocol, u32 prio,
1735                                            bool prio_allocate);
1736
1737 /* Try to insert new proto.
1738  * If proto with specified priority already exists, free new proto
1739  * and return existing one.
1740  */
1741
1742 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1743                                                     struct tcf_proto *tp_new,
1744                                                     u32 protocol, u32 prio,
1745                                                     bool rtnl_held)
1746 {
1747         struct tcf_chain_info chain_info;
1748         struct tcf_proto *tp;
1749         int err = 0;
1750
1751         mutex_lock(&chain->filter_chain_lock);
1752
1753         tp = tcf_chain_tp_find(chain, &chain_info,
1754                                protocol, prio, false);
1755         if (!tp)
1756                 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1757         mutex_unlock(&chain->filter_chain_lock);
1758
1759         if (tp) {
1760                 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1761                 tp_new = tp;
1762         } else if (err) {
1763                 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1764                 tp_new = ERR_PTR(err);
1765         }
1766
1767         return tp_new;
1768 }
1769
1770 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1771                                       struct tcf_proto *tp, bool rtnl_held,
1772                                       struct netlink_ext_ack *extack)
1773 {
1774         struct tcf_chain_info chain_info;
1775         struct tcf_proto *tp_iter;
1776         struct tcf_proto **pprev;
1777         struct tcf_proto *next;
1778
1779         mutex_lock(&chain->filter_chain_lock);
1780
1781         /* Atomically find and remove tp from chain. */
1782         for (pprev = &chain->filter_chain;
1783              (tp_iter = tcf_chain_dereference(*pprev, chain));
1784              pprev = &tp_iter->next) {
1785                 if (tp_iter == tp) {
1786                         chain_info.pprev = pprev;
1787                         chain_info.next = tp_iter->next;
1788                         WARN_ON(tp_iter->deleting);
1789                         break;
1790                 }
1791         }
1792         /* Verify that tp still exists and no new filters were inserted
1793          * concurrently.
1794          * Mark tp for deletion if it is empty.
1795          */
1796         if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) {
1797                 mutex_unlock(&chain->filter_chain_lock);
1798                 return;
1799         }
1800
1801         next = tcf_chain_dereference(chain_info.next, chain);
1802         if (tp == chain->filter_chain)
1803                 tcf_chain0_head_change(chain, next);
1804         RCU_INIT_POINTER(*chain_info.pprev, next);
1805         mutex_unlock(&chain->filter_chain_lock);
1806
1807         tcf_proto_put(tp, rtnl_held, extack);
1808 }
1809
1810 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1811                                            struct tcf_chain_info *chain_info,
1812                                            u32 protocol, u32 prio,
1813                                            bool prio_allocate)
1814 {
1815         struct tcf_proto **pprev;
1816         struct tcf_proto *tp;
1817
1818         /* Check the chain for existence of proto-tcf with this priority */
1819         for (pprev = &chain->filter_chain;
1820              (tp = tcf_chain_dereference(*pprev, chain));
1821              pprev = &tp->next) {
1822                 if (tp->prio >= prio) {
1823                         if (tp->prio == prio) {
1824                                 if (prio_allocate ||
1825                                     (tp->protocol != protocol && protocol))
1826                                         return ERR_PTR(-EINVAL);
1827                         } else {
1828                                 tp = NULL;
1829                         }
1830                         break;
1831                 }
1832         }
1833         chain_info->pprev = pprev;
1834         if (tp) {
1835                 chain_info->next = tp->next;
1836                 tcf_proto_get(tp);
1837         } else {
1838                 chain_info->next = NULL;
1839         }
1840         return tp;
1841 }
1842
1843 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1844                          struct tcf_proto *tp, struct tcf_block *block,
1845                          struct Qdisc *q, u32 parent, void *fh,
1846                          u32 portid, u32 seq, u16 flags, int event,
1847                          bool rtnl_held)
1848 {
1849         struct tcmsg *tcm;
1850         struct nlmsghdr  *nlh;
1851         unsigned char *b = skb_tail_pointer(skb);
1852
1853         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1854         if (!nlh)
1855                 goto out_nlmsg_trim;
1856         tcm = nlmsg_data(nlh);
1857         tcm->tcm_family = AF_UNSPEC;
1858         tcm->tcm__pad1 = 0;
1859         tcm->tcm__pad2 = 0;
1860         if (q) {
1861                 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1862                 tcm->tcm_parent = parent;
1863         } else {
1864                 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1865                 tcm->tcm_block_index = block->index;
1866         }
1867         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1868         if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1869                 goto nla_put_failure;
1870         if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1871                 goto nla_put_failure;
1872         if (!fh) {
1873                 tcm->tcm_handle = 0;
1874         } else {
1875                 if (tp->ops->dump &&
1876                     tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1877                         goto nla_put_failure;
1878         }
1879         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1880         return skb->len;
1881
1882 out_nlmsg_trim:
1883 nla_put_failure:
1884         nlmsg_trim(skb, b);
1885         return -1;
1886 }
1887
1888 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1889                           struct nlmsghdr *n, struct tcf_proto *tp,
1890                           struct tcf_block *block, struct Qdisc *q,
1891                           u32 parent, void *fh, int event, bool unicast,
1892                           bool rtnl_held)
1893 {
1894         struct sk_buff *skb;
1895         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1896
1897         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1898         if (!skb)
1899                 return -ENOBUFS;
1900
1901         if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1902                           n->nlmsg_seq, n->nlmsg_flags, event,
1903                           rtnl_held) <= 0) {
1904                 kfree_skb(skb);
1905                 return -EINVAL;
1906         }
1907
1908         if (unicast)
1909                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1910
1911         return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1912                               n->nlmsg_flags & NLM_F_ECHO);
1913 }
1914
1915 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1916                               struct nlmsghdr *n, struct tcf_proto *tp,
1917                               struct tcf_block *block, struct Qdisc *q,
1918                               u32 parent, void *fh, bool unicast, bool *last,
1919                               bool rtnl_held, struct netlink_ext_ack *extack)
1920 {
1921         struct sk_buff *skb;
1922         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1923         int err;
1924
1925         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1926         if (!skb)
1927                 return -ENOBUFS;
1928
1929         if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1930                           n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1931                           rtnl_held) <= 0) {
1932                 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1933                 kfree_skb(skb);
1934                 return -EINVAL;
1935         }
1936
1937         err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1938         if (err) {
1939                 kfree_skb(skb);
1940                 return err;
1941         }
1942
1943         if (unicast)
1944                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1945
1946         err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1947                              n->nlmsg_flags & NLM_F_ECHO);
1948         if (err < 0)
1949                 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1950         return err;
1951 }
1952
1953 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1954                                  struct tcf_block *block, struct Qdisc *q,
1955                                  u32 parent, struct nlmsghdr *n,
1956                                  struct tcf_chain *chain, int event,
1957                                  bool rtnl_held)
1958 {
1959         struct tcf_proto *tp;
1960
1961         for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1962              tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1963                 tfilter_notify(net, oskb, n, tp, block,
1964                                q, parent, NULL, event, false, rtnl_held);
1965 }
1966
1967 static void tfilter_put(struct tcf_proto *tp, void *fh)
1968 {
1969         if (tp->ops->put && fh)
1970                 tp->ops->put(tp, fh);
1971 }
1972
1973 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1974                           struct netlink_ext_ack *extack)
1975 {
1976         struct net *net = sock_net(skb->sk);
1977         struct nlattr *tca[TCA_MAX + 1];
1978         struct tcmsg *t;
1979         u32 protocol;
1980         u32 prio;
1981         bool prio_allocate;
1982         u32 parent;
1983         u32 chain_index;
1984         struct Qdisc *q = NULL;
1985         struct tcf_chain_info chain_info;
1986         struct tcf_chain *chain = NULL;
1987         struct tcf_block *block;
1988         struct tcf_proto *tp;
1989         unsigned long cl;
1990         void *fh;
1991         int err;
1992         int tp_created;
1993         bool rtnl_held = false;
1994
1995         if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1996                 return -EPERM;
1997
1998 replay:
1999         tp_created = 0;
2000
2001         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2002         if (err < 0)
2003                 return err;
2004
2005         t = nlmsg_data(n);
2006         protocol = TC_H_MIN(t->tcm_info);
2007         prio = TC_H_MAJ(t->tcm_info);
2008         prio_allocate = false;
2009         parent = t->tcm_parent;
2010         tp = NULL;
2011         cl = 0;
2012         block = NULL;
2013
2014         if (prio == 0) {
2015                 /* If no priority is provided by the user,
2016                  * we allocate one.
2017                  */
2018                 if (n->nlmsg_flags & NLM_F_CREATE) {
2019                         prio = TC_H_MAKE(0x80000000U, 0U);
2020                         prio_allocate = true;
2021                 } else {
2022                         NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2023                         return -ENOENT;
2024                 }
2025         }
2026
2027         /* Find head of filter chain. */
2028
2029         err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2030         if (err)
2031                 return err;
2032
2033         /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2034          * block is shared (no qdisc found), qdisc is not unlocked, classifier
2035          * type is not specified, classifier is not unlocked.
2036          */
2037         if (rtnl_held ||
2038             (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2039             !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2040                 rtnl_held = true;
2041                 rtnl_lock();
2042         }
2043
2044         err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2045         if (err)
2046                 goto errout;
2047
2048         block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2049                                  extack);
2050         if (IS_ERR(block)) {
2051                 err = PTR_ERR(block);
2052                 goto errout;
2053         }
2054
2055         chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2056         if (chain_index > TC_ACT_EXT_VAL_MASK) {
2057                 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2058                 err = -EINVAL;
2059                 goto errout;
2060         }
2061         chain = tcf_chain_get(block, chain_index, true);
2062         if (!chain) {
2063                 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2064                 err = -ENOMEM;
2065                 goto errout;
2066         }
2067
2068         mutex_lock(&chain->filter_chain_lock);
2069         tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2070                                prio, prio_allocate);
2071         if (IS_ERR(tp)) {
2072                 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2073                 err = PTR_ERR(tp);
2074                 goto errout_locked;
2075         }
2076
2077         if (tp == NULL) {
2078                 struct tcf_proto *tp_new = NULL;
2079
2080                 if (chain->flushing) {
2081                         err = -EAGAIN;
2082                         goto errout_locked;
2083                 }
2084
2085                 /* Proto-tcf does not exist, create new one */
2086
2087                 if (tca[TCA_KIND] == NULL || !protocol) {
2088                         NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2089                         err = -EINVAL;
2090                         goto errout_locked;
2091                 }
2092
2093                 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2094                         NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2095                         err = -ENOENT;
2096                         goto errout_locked;
2097                 }
2098
2099                 if (prio_allocate)
2100                         prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2101                                                                &chain_info));
2102
2103                 mutex_unlock(&chain->filter_chain_lock);
2104                 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]),
2105                                           protocol, prio, chain, rtnl_held,
2106                                           extack);
2107                 if (IS_ERR(tp_new)) {
2108                         err = PTR_ERR(tp_new);
2109                         goto errout_tp;
2110                 }
2111
2112                 tp_created = 1;
2113                 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2114                                                 rtnl_held);
2115                 if (IS_ERR(tp)) {
2116                         err = PTR_ERR(tp);
2117                         goto errout_tp;
2118                 }
2119         } else {
2120                 mutex_unlock(&chain->filter_chain_lock);
2121         }
2122
2123         if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2124                 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2125                 err = -EINVAL;
2126                 goto errout;
2127         }
2128
2129         fh = tp->ops->get(tp, t->tcm_handle);
2130
2131         if (!fh) {
2132                 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2133                         NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2134                         err = -ENOENT;
2135                         goto errout;
2136                 }
2137         } else if (n->nlmsg_flags & NLM_F_EXCL) {
2138                 tfilter_put(tp, fh);
2139                 NL_SET_ERR_MSG(extack, "Filter already exists");
2140                 err = -EEXIST;
2141                 goto errout;
2142         }
2143
2144         if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2145                 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2146                 err = -EINVAL;
2147                 goto errout;
2148         }
2149
2150         err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2151                               n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2152                               rtnl_held, extack);
2153         if (err == 0) {
2154                 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2155                                RTM_NEWTFILTER, false, rtnl_held);
2156                 tfilter_put(tp, fh);
2157         }
2158
2159 errout:
2160         if (err && tp_created)
2161                 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2162 errout_tp:
2163         if (chain) {
2164                 if (tp && !IS_ERR(tp))
2165                         tcf_proto_put(tp, rtnl_held, NULL);
2166                 if (!tp_created)
2167                         tcf_chain_put(chain);
2168         }
2169         tcf_block_release(q, block, rtnl_held);
2170
2171         if (rtnl_held)
2172                 rtnl_unlock();
2173
2174         if (err == -EAGAIN) {
2175                 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2176                  * of target chain.
2177                  */
2178                 rtnl_held = true;
2179                 /* Replay the request. */
2180                 goto replay;
2181         }
2182         return err;
2183
2184 errout_locked:
2185         mutex_unlock(&chain->filter_chain_lock);
2186         goto errout;
2187 }
2188
2189 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2190                           struct netlink_ext_ack *extack)
2191 {
2192         struct net *net = sock_net(skb->sk);
2193         struct nlattr *tca[TCA_MAX + 1];
2194         struct tcmsg *t;
2195         u32 protocol;
2196         u32 prio;
2197         u32 parent;
2198         u32 chain_index;
2199         struct Qdisc *q = NULL;
2200         struct tcf_chain_info chain_info;
2201         struct tcf_chain *chain = NULL;
2202         struct tcf_block *block = NULL;
2203         struct tcf_proto *tp = NULL;
2204         unsigned long cl = 0;
2205         void *fh = NULL;
2206         int err;
2207         bool rtnl_held = false;
2208
2209         if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2210                 return -EPERM;
2211
2212         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2213         if (err < 0)
2214                 return err;
2215
2216         t = nlmsg_data(n);
2217         protocol = TC_H_MIN(t->tcm_info);
2218         prio = TC_H_MAJ(t->tcm_info);
2219         parent = t->tcm_parent;
2220
2221         if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2222                 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2223                 return -ENOENT;
2224         }
2225
2226         /* Find head of filter chain. */
2227
2228         err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2229         if (err)
2230                 return err;
2231
2232         /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2233          * found), qdisc is not unlocked, classifier type is not specified,
2234          * classifier is not unlocked.
2235          */
2236         if (!prio ||
2237             (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2238             !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2239                 rtnl_held = true;
2240                 rtnl_lock();
2241         }
2242
2243         err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2244         if (err)
2245                 goto errout;
2246
2247         block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2248                                  extack);
2249         if (IS_ERR(block)) {
2250                 err = PTR_ERR(block);
2251                 goto errout;
2252         }
2253
2254         chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2255         if (chain_index > TC_ACT_EXT_VAL_MASK) {
2256                 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2257                 err = -EINVAL;
2258                 goto errout;
2259         }
2260         chain = tcf_chain_get(block, chain_index, false);
2261         if (!chain) {
2262                 /* User requested flush on non-existent chain. Nothing to do,
2263                  * so just return success.
2264                  */
2265                 if (prio == 0) {
2266                         err = 0;
2267                         goto errout;
2268                 }
2269                 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2270                 err = -ENOENT;
2271                 goto errout;
2272         }
2273
2274         if (prio == 0) {
2275                 tfilter_notify_chain(net, skb, block, q, parent, n,
2276                                      chain, RTM_DELTFILTER, rtnl_held);
2277                 tcf_chain_flush(chain, rtnl_held);
2278                 err = 0;
2279                 goto errout;
2280         }
2281
2282         mutex_lock(&chain->filter_chain_lock);
2283         tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2284                                prio, false);
2285         if (!tp || IS_ERR(tp)) {
2286                 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2287                 err = tp ? PTR_ERR(tp) : -ENOENT;
2288                 goto errout_locked;
2289         } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2290                 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2291                 err = -EINVAL;
2292                 goto errout_locked;
2293         } else if (t->tcm_handle == 0) {
2294                 tcf_chain_tp_remove(chain, &chain_info, tp);
2295                 mutex_unlock(&chain->filter_chain_lock);
2296
2297                 tcf_proto_put(tp, rtnl_held, NULL);
2298                 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2299                                RTM_DELTFILTER, false, rtnl_held);
2300                 err = 0;
2301                 goto errout;
2302         }
2303         mutex_unlock(&chain->filter_chain_lock);
2304
2305         fh = tp->ops->get(tp, t->tcm_handle);
2306
2307         if (!fh) {
2308                 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2309                 err = -ENOENT;
2310         } else {
2311                 bool last;
2312
2313                 err = tfilter_del_notify(net, skb, n, tp, block,
2314                                          q, parent, fh, false, &last,
2315                                          rtnl_held, extack);
2316
2317                 if (err)
2318                         goto errout;
2319                 if (last)
2320                         tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2321         }
2322
2323 errout:
2324         if (chain) {
2325                 if (tp && !IS_ERR(tp))
2326                         tcf_proto_put(tp, rtnl_held, NULL);
2327                 tcf_chain_put(chain);
2328         }
2329         tcf_block_release(q, block, rtnl_held);
2330
2331         if (rtnl_held)
2332                 rtnl_unlock();
2333
2334         return err;
2335
2336 errout_locked:
2337         mutex_unlock(&chain->filter_chain_lock);
2338         goto errout;
2339 }
2340
2341 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2342                           struct netlink_ext_ack *extack)
2343 {
2344         struct net *net = sock_net(skb->sk);
2345         struct nlattr *tca[TCA_MAX + 1];
2346         struct tcmsg *t;
2347         u32 protocol;
2348         u32 prio;
2349         u32 parent;
2350         u32 chain_index;
2351         struct Qdisc *q = NULL;
2352         struct tcf_chain_info chain_info;
2353         struct tcf_chain *chain = NULL;
2354         struct tcf_block *block = NULL;
2355         struct tcf_proto *tp = NULL;
2356         unsigned long cl = 0;
2357         void *fh = NULL;
2358         int err;
2359         bool rtnl_held = false;
2360
2361         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2362         if (err < 0)
2363                 return err;
2364
2365         t = nlmsg_data(n);
2366         protocol = TC_H_MIN(t->tcm_info);
2367         prio = TC_H_MAJ(t->tcm_info);
2368         parent = t->tcm_parent;
2369
2370         if (prio == 0) {
2371                 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2372                 return -ENOENT;
2373         }
2374
2375         /* Find head of filter chain. */
2376
2377         err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2378         if (err)
2379                 return err;
2380
2381         /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2382          * unlocked, classifier type is not specified, classifier is not
2383          * unlocked.
2384          */
2385         if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2386             !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2387                 rtnl_held = true;
2388                 rtnl_lock();
2389         }
2390
2391         err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2392         if (err)
2393                 goto errout;
2394
2395         block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2396                                  extack);
2397         if (IS_ERR(block)) {
2398                 err = PTR_ERR(block);
2399                 goto errout;
2400         }
2401
2402         chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2403         if (chain_index > TC_ACT_EXT_VAL_MASK) {
2404                 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2405                 err = -EINVAL;
2406                 goto errout;
2407         }
2408         chain = tcf_chain_get(block, chain_index, false);
2409         if (!chain) {
2410                 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2411                 err = -EINVAL;
2412                 goto errout;
2413         }
2414
2415         mutex_lock(&chain->filter_chain_lock);
2416         tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2417                                prio, false);
2418         mutex_unlock(&chain->filter_chain_lock);
2419         if (!tp || IS_ERR(tp)) {
2420                 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2421                 err = tp ? PTR_ERR(tp) : -ENOENT;
2422                 goto errout;
2423         } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2424                 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2425                 err = -EINVAL;
2426                 goto errout;
2427         }
2428
2429         fh = tp->ops->get(tp, t->tcm_handle);
2430
2431         if (!fh) {
2432                 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2433                 err = -ENOENT;
2434         } else {
2435                 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2436                                      fh, RTM_NEWTFILTER, true, rtnl_held);
2437                 if (err < 0)
2438                         NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2439         }
2440
2441         tfilter_put(tp, fh);
2442 errout:
2443         if (chain) {
2444                 if (tp && !IS_ERR(tp))
2445                         tcf_proto_put(tp, rtnl_held, NULL);
2446                 tcf_chain_put(chain);
2447         }
2448         tcf_block_release(q, block, rtnl_held);
2449
2450         if (rtnl_held)
2451                 rtnl_unlock();
2452
2453         return err;
2454 }
2455
2456 struct tcf_dump_args {
2457         struct tcf_walker w;
2458         struct sk_buff *skb;
2459         struct netlink_callback *cb;
2460         struct tcf_block *block;
2461         struct Qdisc *q;
2462         u32 parent;
2463 };
2464
2465 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2466 {
2467         struct tcf_dump_args *a = (void *)arg;
2468         struct net *net = sock_net(a->skb->sk);
2469
2470         return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2471                              n, NETLINK_CB(a->cb->skb).portid,
2472                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2473                              RTM_NEWTFILTER, true);
2474 }
2475
2476 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2477                            struct sk_buff *skb, struct netlink_callback *cb,
2478                            long index_start, long *p_index)
2479 {
2480         struct net *net = sock_net(skb->sk);
2481         struct tcf_block *block = chain->block;
2482         struct tcmsg *tcm = nlmsg_data(cb->nlh);
2483         struct tcf_proto *tp, *tp_prev;
2484         struct tcf_dump_args arg;
2485
2486         for (tp = __tcf_get_next_proto(chain, NULL);
2487              tp;
2488              tp_prev = tp,
2489                      tp = __tcf_get_next_proto(chain, tp),
2490                      tcf_proto_put(tp_prev, true, NULL),
2491                      (*p_index)++) {
2492                 if (*p_index < index_start)
2493                         continue;
2494                 if (TC_H_MAJ(tcm->tcm_info) &&
2495                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
2496                         continue;
2497                 if (TC_H_MIN(tcm->tcm_info) &&
2498                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
2499                         continue;
2500                 if (*p_index > index_start)
2501                         memset(&cb->args[1], 0,
2502                                sizeof(cb->args) - sizeof(cb->args[0]));
2503                 if (cb->args[1] == 0) {
2504                         if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2505                                           NETLINK_CB(cb->skb).portid,
2506                                           cb->nlh->nlmsg_seq, NLM_F_MULTI,
2507                                           RTM_NEWTFILTER, true) <= 0)
2508                                 goto errout;
2509                         cb->args[1] = 1;
2510                 }
2511                 if (!tp->ops->walk)
2512                         continue;
2513                 arg.w.fn = tcf_node_dump;
2514                 arg.skb = skb;
2515                 arg.cb = cb;
2516                 arg.block = block;
2517                 arg.q = q;
2518                 arg.parent = parent;
2519                 arg.w.stop = 0;
2520                 arg.w.skip = cb->args[1] - 1;
2521                 arg.w.count = 0;
2522                 arg.w.cookie = cb->args[2];
2523                 tp->ops->walk(tp, &arg.w, true);
2524                 cb->args[2] = arg.w.cookie;
2525                 cb->args[1] = arg.w.count + 1;
2526                 if (arg.w.stop)
2527                         goto errout;
2528         }
2529         return true;
2530
2531 errout:
2532         tcf_proto_put(tp, true, NULL);
2533         return false;
2534 }
2535
2536 /* called with RTNL */
2537 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2538 {
2539         struct tcf_chain *chain, *chain_prev;
2540         struct net *net = sock_net(skb->sk);
2541         struct nlattr *tca[TCA_MAX + 1];
2542         struct Qdisc *q = NULL;
2543         struct tcf_block *block;
2544         struct tcmsg *tcm = nlmsg_data(cb->nlh);
2545         long index_start;
2546         long index;
2547         u32 parent;
2548         int err;
2549
2550         if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2551                 return skb->len;
2552
2553         err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL,
2554                           cb->extack);
2555         if (err)
2556                 return err;
2557
2558         if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2559                 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2560                 if (!block)
2561                         goto out;
2562                 /* If we work with block index, q is NULL and parent value
2563                  * will never be used in the following code. The check
2564                  * in tcf_fill_node prevents it. However, compiler does not
2565                  * see that far, so set parent to zero to silence the warning
2566                  * about parent being uninitialized.
2567                  */
2568                 parent = 0;
2569         } else {
2570                 const struct Qdisc_class_ops *cops;
2571                 struct net_device *dev;
2572                 unsigned long cl = 0;
2573
2574                 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2575                 if (!dev)
2576                         return skb->len;
2577
2578                 parent = tcm->tcm_parent;
2579                 if (!parent) {
2580                         q = dev->qdisc;
2581                         parent = q->handle;
2582                 } else {
2583                         q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2584                 }
2585                 if (!q)
2586                         goto out;
2587                 cops = q->ops->cl_ops;
2588                 if (!cops)
2589                         goto out;
2590                 if (!cops->tcf_block)
2591                         goto out;
2592                 if (TC_H_MIN(tcm->tcm_parent)) {
2593                         cl = cops->find(q, tcm->tcm_parent);
2594                         if (cl == 0)
2595                                 goto out;
2596                 }
2597                 block = cops->tcf_block(q, cl, NULL);
2598                 if (!block)
2599                         goto out;
2600                 if (tcf_block_shared(block))
2601                         q = NULL;
2602         }
2603
2604         index_start = cb->args[0];
2605         index = 0;
2606
2607         for (chain = __tcf_get_next_chain(block, NULL);
2608              chain;
2609              chain_prev = chain,
2610                      chain = __tcf_get_next_chain(block, chain),
2611                      tcf_chain_put(chain_prev)) {
2612                 if (tca[TCA_CHAIN] &&
2613                     nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2614                         continue;
2615                 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2616                                     index_start, &index)) {
2617                         tcf_chain_put(chain);
2618                         err = -EMSGSIZE;
2619                         break;
2620                 }
2621         }
2622
2623         if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2624                 tcf_block_refcnt_put(block, true);
2625         cb->args[0] = index;
2626
2627 out:
2628         /* If we did no progress, the error (EMSGSIZE) is real */
2629         if (skb->len == 0 && err)
2630                 return err;
2631         return skb->len;
2632 }
2633
2634 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2635                               void *tmplt_priv, u32 chain_index,
2636                               struct net *net, struct sk_buff *skb,
2637                               struct tcf_block *block,
2638                               u32 portid, u32 seq, u16 flags, int event)
2639 {
2640         unsigned char *b = skb_tail_pointer(skb);
2641         const struct tcf_proto_ops *ops;
2642         struct nlmsghdr *nlh;
2643         struct tcmsg *tcm;
2644         void *priv;
2645
2646         ops = tmplt_ops;
2647         priv = tmplt_priv;
2648
2649         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2650         if (!nlh)
2651                 goto out_nlmsg_trim;
2652         tcm = nlmsg_data(nlh);
2653         tcm->tcm_family = AF_UNSPEC;
2654         tcm->tcm__pad1 = 0;
2655         tcm->tcm__pad2 = 0;
2656         tcm->tcm_handle = 0;
2657         if (block->q) {
2658                 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2659                 tcm->tcm_parent = block->q->handle;
2660         } else {
2661                 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2662                 tcm->tcm_block_index = block->index;
2663         }
2664
2665         if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2666                 goto nla_put_failure;
2667
2668         if (ops) {
2669                 if (nla_put_string(skb, TCA_KIND, ops->kind))
2670                         goto nla_put_failure;
2671                 if (ops->tmplt_dump(skb, net, priv) < 0)
2672                         goto nla_put_failure;
2673         }
2674
2675         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2676         return skb->len;
2677
2678 out_nlmsg_trim:
2679 nla_put_failure:
2680         nlmsg_trim(skb, b);
2681         return -EMSGSIZE;
2682 }
2683
2684 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2685                            u32 seq, u16 flags, int event, bool unicast)
2686 {
2687         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2688         struct tcf_block *block = chain->block;
2689         struct net *net = block->net;
2690         struct sk_buff *skb;
2691
2692         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2693         if (!skb)
2694                 return -ENOBUFS;
2695
2696         if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2697                                chain->index, net, skb, block, portid,
2698                                seq, flags, event) <= 0) {
2699                 kfree_skb(skb);
2700                 return -EINVAL;
2701         }
2702
2703         if (unicast)
2704                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2705
2706         return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2707 }
2708
2709 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2710                                   void *tmplt_priv, u32 chain_index,
2711                                   struct tcf_block *block, struct sk_buff *oskb,
2712                                   u32 seq, u16 flags, bool unicast)
2713 {
2714         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2715         struct net *net = block->net;
2716         struct sk_buff *skb;
2717
2718         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2719         if (!skb)
2720                 return -ENOBUFS;
2721
2722         if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2723                                block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2724                 kfree_skb(skb);
2725                 return -EINVAL;
2726         }
2727
2728         if (unicast)
2729                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2730
2731         return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2732 }
2733
2734 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2735                               struct nlattr **tca,
2736                               struct netlink_ext_ack *extack)
2737 {
2738         const struct tcf_proto_ops *ops;
2739         void *tmplt_priv;
2740
2741         /* If kind is not set, user did not specify template. */
2742         if (!tca[TCA_KIND])
2743                 return 0;
2744
2745         ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack);
2746         if (IS_ERR(ops))
2747                 return PTR_ERR(ops);
2748         if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2749                 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2750                 return -EOPNOTSUPP;
2751         }
2752
2753         tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2754         if (IS_ERR(tmplt_priv)) {
2755                 module_put(ops->owner);
2756                 return PTR_ERR(tmplt_priv);
2757         }
2758         chain->tmplt_ops = ops;
2759         chain->tmplt_priv = tmplt_priv;
2760         return 0;
2761 }
2762
2763 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2764                                void *tmplt_priv)
2765 {
2766         /* If template ops are set, no work to do for us. */
2767         if (!tmplt_ops)
2768                 return;
2769
2770         tmplt_ops->tmplt_destroy(tmplt_priv);
2771         module_put(tmplt_ops->owner);
2772 }
2773
2774 /* Add/delete/get a chain */
2775
2776 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2777                         struct netlink_ext_ack *extack)
2778 {
2779         struct net *net = sock_net(skb->sk);
2780         struct nlattr *tca[TCA_MAX + 1];
2781         struct tcmsg *t;
2782         u32 parent;
2783         u32 chain_index;
2784         struct Qdisc *q = NULL;
2785         struct tcf_chain *chain = NULL;
2786         struct tcf_block *block;
2787         unsigned long cl;
2788         int err;
2789
2790         if (n->nlmsg_type != RTM_GETCHAIN &&
2791             !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2792                 return -EPERM;
2793
2794 replay:
2795         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2796         if (err < 0)
2797                 return err;
2798
2799         t = nlmsg_data(n);
2800         parent = t->tcm_parent;
2801         cl = 0;
2802
2803         block = tcf_block_find(net, &q, &parent, &cl,
2804                                t->tcm_ifindex, t->tcm_block_index, extack);
2805         if (IS_ERR(block))
2806                 return PTR_ERR(block);
2807
2808         chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2809         if (chain_index > TC_ACT_EXT_VAL_MASK) {
2810                 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2811                 err = -EINVAL;
2812                 goto errout_block;
2813         }
2814
2815         mutex_lock(&block->lock);
2816         chain = tcf_chain_lookup(block, chain_index);
2817         if (n->nlmsg_type == RTM_NEWCHAIN) {
2818                 if (chain) {
2819                         if (tcf_chain_held_by_acts_only(chain)) {
2820                                 /* The chain exists only because there is
2821                                  * some action referencing it.
2822                                  */
2823                                 tcf_chain_hold(chain);
2824                         } else {
2825                                 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2826                                 err = -EEXIST;
2827                                 goto errout_block_locked;
2828                         }
2829                 } else {
2830                         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2831                                 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2832                                 err = -ENOENT;
2833                                 goto errout_block_locked;
2834                         }
2835                         chain = tcf_chain_create(block, chain_index);
2836                         if (!chain) {
2837                                 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2838                                 err = -ENOMEM;
2839                                 goto errout_block_locked;
2840                         }
2841                 }
2842         } else {
2843                 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2844                         NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2845                         err = -EINVAL;
2846                         goto errout_block_locked;
2847                 }
2848                 tcf_chain_hold(chain);
2849         }
2850
2851         if (n->nlmsg_type == RTM_NEWCHAIN) {
2852                 /* Modifying chain requires holding parent block lock. In case
2853                  * the chain was successfully added, take a reference to the
2854                  * chain. This ensures that an empty chain does not disappear at
2855                  * the end of this function.
2856                  */
2857                 tcf_chain_hold(chain);
2858                 chain->explicitly_created = true;
2859         }
2860         mutex_unlock(&block->lock);
2861
2862         switch (n->nlmsg_type) {
2863         case RTM_NEWCHAIN:
2864                 err = tc_chain_tmplt_add(chain, net, tca, extack);
2865                 if (err) {
2866                         tcf_chain_put_explicitly_created(chain);
2867                         goto errout;
2868                 }
2869
2870                 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2871                                 RTM_NEWCHAIN, false);
2872                 break;
2873         case RTM_DELCHAIN:
2874                 tfilter_notify_chain(net, skb, block, q, parent, n,
2875                                      chain, RTM_DELTFILTER, true);
2876                 /* Flush the chain first as the user requested chain removal. */
2877                 tcf_chain_flush(chain, true);
2878                 /* In case the chain was successfully deleted, put a reference
2879                  * to the chain previously taken during addition.
2880                  */
2881                 tcf_chain_put_explicitly_created(chain);
2882                 break;
2883         case RTM_GETCHAIN:
2884                 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2885                                       n->nlmsg_seq, n->nlmsg_type, true);
2886                 if (err < 0)
2887                         NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2888                 break;
2889         default:
2890                 err = -EOPNOTSUPP;
2891                 NL_SET_ERR_MSG(extack, "Unsupported message type");
2892                 goto errout;
2893         }
2894
2895 errout:
2896         tcf_chain_put(chain);
2897 errout_block:
2898         tcf_block_release(q, block, true);
2899         if (err == -EAGAIN)
2900                 /* Replay the request. */
2901                 goto replay;
2902         return err;
2903
2904 errout_block_locked:
2905         mutex_unlock(&block->lock);
2906         goto errout_block;
2907 }
2908
2909 /* called with RTNL */
2910 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2911 {
2912         struct net *net = sock_net(skb->sk);
2913         struct nlattr *tca[TCA_MAX + 1];
2914         struct Qdisc *q = NULL;
2915         struct tcf_block *block;
2916         struct tcmsg *tcm = nlmsg_data(cb->nlh);
2917         struct tcf_chain *chain;
2918         long index_start;
2919         long index;
2920         u32 parent;
2921         int err;
2922
2923         if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2924                 return skb->len;
2925
2926         err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
2927                           cb->extack);
2928         if (err)
2929                 return err;
2930
2931         if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2932                 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2933                 if (!block)
2934                         goto out;
2935                 /* If we work with block index, q is NULL and parent value
2936                  * will never be used in the following code. The check
2937                  * in tcf_fill_node prevents it. However, compiler does not
2938                  * see that far, so set parent to zero to silence the warning
2939                  * about parent being uninitialized.
2940                  */
2941                 parent = 0;
2942         } else {
2943                 const struct Qdisc_class_ops *cops;
2944                 struct net_device *dev;
2945                 unsigned long cl = 0;
2946
2947                 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2948                 if (!dev)
2949                         return skb->len;
2950
2951                 parent = tcm->tcm_parent;
2952                 if (!parent) {
2953                         q = dev->qdisc;
2954                         parent = q->handle;
2955                 } else {
2956                         q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2957                 }
2958                 if (!q)
2959                         goto out;
2960                 cops = q->ops->cl_ops;
2961                 if (!cops)
2962                         goto out;
2963                 if (!cops->tcf_block)
2964                         goto out;
2965                 if (TC_H_MIN(tcm->tcm_parent)) {
2966                         cl = cops->find(q, tcm->tcm_parent);
2967                         if (cl == 0)
2968                                 goto out;
2969                 }
2970                 block = cops->tcf_block(q, cl, NULL);
2971                 if (!block)
2972                         goto out;
2973                 if (tcf_block_shared(block))
2974                         q = NULL;
2975         }
2976
2977         index_start = cb->args[0];
2978         index = 0;
2979
2980         mutex_lock(&block->lock);
2981         list_for_each_entry(chain, &block->chain_list, list) {
2982                 if ((tca[TCA_CHAIN] &&
2983                      nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2984                         continue;
2985                 if (index < index_start) {
2986                         index++;
2987                         continue;
2988                 }
2989                 if (tcf_chain_held_by_acts_only(chain))
2990                         continue;
2991                 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2992                                          chain->index, net, skb, block,
2993                                          NETLINK_CB(cb->skb).portid,
2994                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
2995                                          RTM_NEWCHAIN);
2996                 if (err <= 0)
2997                         break;
2998                 index++;
2999         }
3000         mutex_unlock(&block->lock);
3001
3002         if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3003                 tcf_block_refcnt_put(block, true);
3004         cb->args[0] = index;
3005
3006 out:
3007         /* If we did no progress, the error (EMSGSIZE) is real */
3008         if (skb->len == 0 && err)
3009                 return err;
3010         return skb->len;
3011 }
3012
3013 void tcf_exts_destroy(struct tcf_exts *exts)
3014 {
3015 #ifdef CONFIG_NET_CLS_ACT
3016         tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3017         kfree(exts->actions);
3018         exts->nr_actions = 0;
3019 #endif
3020 }
3021 EXPORT_SYMBOL(tcf_exts_destroy);
3022
3023 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3024                       struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3025                       bool rtnl_held, struct netlink_ext_ack *extack)
3026 {
3027 #ifdef CONFIG_NET_CLS_ACT
3028         {
3029                 struct tc_action *act;
3030                 size_t attr_size = 0;
3031
3032                 if (exts->police && tb[exts->police]) {
3033                         act = tcf_action_init_1(net, tp, tb[exts->police],
3034                                                 rate_tlv, "police", ovr,
3035                                                 TCA_ACT_BIND, rtnl_held,
3036                                                 extack);
3037                         if (IS_ERR(act))
3038                                 return PTR_ERR(act);
3039
3040                         act->type = exts->type = TCA_OLD_COMPAT;
3041                         exts->actions[0] = act;
3042                         exts->nr_actions = 1;
3043                 } else if (exts->action && tb[exts->action]) {
3044                         int err;
3045
3046                         err = tcf_action_init(net, tp, tb[exts->action],
3047                                               rate_tlv, NULL, ovr, TCA_ACT_BIND,
3048                                               exts->actions, &attr_size,
3049                                               rtnl_held, extack);
3050                         if (err < 0)
3051                                 return err;
3052                         exts->nr_actions = err;
3053                 }
3054         }
3055 #else
3056         if ((exts->action && tb[exts->action]) ||
3057             (exts->police && tb[exts->police])) {
3058                 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3059                 return -EOPNOTSUPP;
3060         }
3061 #endif
3062
3063         return 0;
3064 }
3065 EXPORT_SYMBOL(tcf_exts_validate);
3066
3067 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3068 {
3069 #ifdef CONFIG_NET_CLS_ACT
3070         struct tcf_exts old = *dst;
3071
3072         *dst = *src;
3073         tcf_exts_destroy(&old);
3074 #endif
3075 }
3076 EXPORT_SYMBOL(tcf_exts_change);
3077
3078 #ifdef CONFIG_NET_CLS_ACT
3079 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3080 {
3081         if (exts->nr_actions == 0)
3082                 return NULL;
3083         else
3084                 return exts->actions[0];
3085 }
3086 #endif
3087
3088 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3089 {
3090 #ifdef CONFIG_NET_CLS_ACT
3091         struct nlattr *nest;
3092
3093         if (exts->action && tcf_exts_has_actions(exts)) {
3094                 /*
3095                  * again for backward compatible mode - we want
3096                  * to work with both old and new modes of entering
3097                  * tc data even if iproute2  was newer - jhs
3098                  */
3099                 if (exts->type != TCA_OLD_COMPAT) {
3100                         nest = nla_nest_start(skb, exts->action);
3101                         if (nest == NULL)
3102                                 goto nla_put_failure;
3103
3104                         if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
3105                                 goto nla_put_failure;
3106                         nla_nest_end(skb, nest);
3107                 } else if (exts->police) {
3108                         struct tc_action *act = tcf_exts_first_act(exts);
3109                         nest = nla_nest_start(skb, exts->police);
3110                         if (nest == NULL || !act)
3111                                 goto nla_put_failure;
3112                         if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3113                                 goto nla_put_failure;
3114                         nla_nest_end(skb, nest);
3115                 }
3116         }
3117         return 0;
3118
3119 nla_put_failure:
3120         nla_nest_cancel(skb, nest);
3121         return -1;
3122 #else
3123         return 0;
3124 #endif
3125 }
3126 EXPORT_SYMBOL(tcf_exts_dump);
3127
3128
3129 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3130 {
3131 #ifdef CONFIG_NET_CLS_ACT
3132         struct tc_action *a = tcf_exts_first_act(exts);
3133         if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3134                 return -1;
3135 #endif
3136         return 0;
3137 }
3138 EXPORT_SYMBOL(tcf_exts_dump_stats);
3139
3140 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3141                      void *type_data, bool err_stop)
3142 {
3143         struct tcf_block_cb *block_cb;
3144         int ok_count = 0;
3145         int err;
3146
3147         /* Make sure all netdevs sharing this block are offload-capable. */
3148         if (block->nooffloaddevcnt && err_stop)
3149                 return -EOPNOTSUPP;
3150
3151         list_for_each_entry(block_cb, &block->cb_list, list) {
3152                 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3153                 if (err) {
3154                         if (err_stop)
3155                                 return err;
3156                 } else {
3157                         ok_count++;
3158                 }
3159         }
3160         return ok_count;
3161 }
3162 EXPORT_SYMBOL(tc_setup_cb_call);
3163
3164 int tc_setup_flow_action(struct flow_action *flow_action,
3165                          const struct tcf_exts *exts)
3166 {
3167         const struct tc_action *act;
3168         int i, j, k;
3169
3170         if (!exts)
3171                 return 0;
3172
3173         j = 0;
3174         tcf_exts_for_each_action(i, act, exts) {
3175                 struct flow_action_entry *entry;
3176
3177                 entry = &flow_action->entries[j];
3178                 if (is_tcf_gact_ok(act)) {
3179                         entry->id = FLOW_ACTION_ACCEPT;
3180                 } else if (is_tcf_gact_shot(act)) {
3181                         entry->id = FLOW_ACTION_DROP;
3182                 } else if (is_tcf_gact_trap(act)) {
3183                         entry->id = FLOW_ACTION_TRAP;
3184                 } else if (is_tcf_gact_goto_chain(act)) {
3185                         entry->id = FLOW_ACTION_GOTO;
3186                         entry->chain_index = tcf_gact_goto_chain_index(act);
3187                 } else if (is_tcf_mirred_egress_redirect(act)) {
3188                         entry->id = FLOW_ACTION_REDIRECT;
3189                         entry->dev = tcf_mirred_dev(act);
3190                 } else if (is_tcf_mirred_egress_mirror(act)) {
3191                         entry->id = FLOW_ACTION_MIRRED;
3192                         entry->dev = tcf_mirred_dev(act);
3193                 } else if (is_tcf_vlan(act)) {
3194                         switch (tcf_vlan_action(act)) {
3195                         case TCA_VLAN_ACT_PUSH:
3196                                 entry->id = FLOW_ACTION_VLAN_PUSH;
3197                                 entry->vlan.vid = tcf_vlan_push_vid(act);
3198                                 entry->vlan.proto = tcf_vlan_push_proto(act);
3199                                 entry->vlan.prio = tcf_vlan_push_prio(act);
3200                                 break;
3201                         case TCA_VLAN_ACT_POP:
3202                                 entry->id = FLOW_ACTION_VLAN_POP;
3203                                 break;
3204                         case TCA_VLAN_ACT_MODIFY:
3205                                 entry->id = FLOW_ACTION_VLAN_MANGLE;
3206                                 entry->vlan.vid = tcf_vlan_push_vid(act);
3207                                 entry->vlan.proto = tcf_vlan_push_proto(act);
3208                                 entry->vlan.prio = tcf_vlan_push_prio(act);
3209                                 break;
3210                         default:
3211                                 goto err_out;
3212                         }
3213                 } else if (is_tcf_tunnel_set(act)) {
3214                         entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3215                         entry->tunnel = tcf_tunnel_info(act);
3216                 } else if (is_tcf_tunnel_release(act)) {
3217                         entry->id = FLOW_ACTION_TUNNEL_DECAP;
3218                         entry->tunnel = tcf_tunnel_info(act);
3219                 } else if (is_tcf_pedit(act)) {
3220                         for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3221                                 switch (tcf_pedit_cmd(act, k)) {
3222                                 case TCA_PEDIT_KEY_EX_CMD_SET:
3223                                         entry->id = FLOW_ACTION_MANGLE;
3224                                         break;
3225                                 case TCA_PEDIT_KEY_EX_CMD_ADD:
3226                                         entry->id = FLOW_ACTION_ADD;
3227                                         break;
3228                                 default:
3229                                         goto err_out;
3230                                 }
3231                                 entry->mangle.htype = tcf_pedit_htype(act, k);
3232                                 entry->mangle.mask = tcf_pedit_mask(act, k);
3233                                 entry->mangle.val = tcf_pedit_val(act, k);
3234                                 entry->mangle.offset = tcf_pedit_offset(act, k);
3235                                 entry = &flow_action->entries[++j];
3236                         }
3237                 } else if (is_tcf_csum(act)) {
3238                         entry->id = FLOW_ACTION_CSUM;
3239                         entry->csum_flags = tcf_csum_update_flags(act);
3240                 } else if (is_tcf_skbedit_mark(act)) {
3241                         entry->id = FLOW_ACTION_MARK;
3242                         entry->mark = tcf_skbedit_mark(act);
3243                 } else {
3244                         goto err_out;
3245                 }
3246
3247                 if (!is_tcf_pedit(act))
3248                         j++;
3249         }
3250         return 0;
3251 err_out:
3252         return -EOPNOTSUPP;
3253 }
3254 EXPORT_SYMBOL(tc_setup_flow_action);
3255
3256 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3257 {
3258         unsigned int num_acts = 0;
3259         struct tc_action *act;
3260         int i;
3261
3262         tcf_exts_for_each_action(i, act, exts) {
3263                 if (is_tcf_pedit(act))
3264                         num_acts += tcf_pedit_nkeys(act);
3265                 else
3266                         num_acts++;
3267         }
3268         return num_acts;
3269 }
3270 EXPORT_SYMBOL(tcf_exts_num_actions);
3271
3272 static __net_init int tcf_net_init(struct net *net)
3273 {
3274         struct tcf_net *tn = net_generic(net, tcf_net_id);
3275
3276         spin_lock_init(&tn->idr_lock);
3277         idr_init(&tn->idr);
3278         return 0;
3279 }
3280
3281 static void __net_exit tcf_net_exit(struct net *net)
3282 {
3283         struct tcf_net *tn = net_generic(net, tcf_net_id);
3284
3285         idr_destroy(&tn->idr);
3286 }
3287
3288 static struct pernet_operations tcf_net_ops = {
3289         .init = tcf_net_init,
3290         .exit = tcf_net_exit,
3291         .id   = &tcf_net_id,
3292         .size = sizeof(struct tcf_net),
3293 };
3294
3295 static int __init tc_filter_init(void)
3296 {
3297         int err;
3298
3299         tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3300         if (!tc_filter_wq)
3301                 return -ENOMEM;
3302
3303         err = register_pernet_subsys(&tcf_net_ops);
3304         if (err)
3305                 goto err_register_pernet_subsys;
3306
3307         err = rhashtable_init(&indr_setup_block_ht,
3308                               &tc_indr_setup_block_ht_params);
3309         if (err)
3310                 goto err_rhash_setup_block_ht;
3311
3312         rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3313                       RTNL_FLAG_DOIT_UNLOCKED);
3314         rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3315                       RTNL_FLAG_DOIT_UNLOCKED);
3316         rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3317                       tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3318         rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3319         rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3320         rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3321                       tc_dump_chain, 0);
3322
3323         return 0;
3324
3325 err_rhash_setup_block_ht:
3326         unregister_pernet_subsys(&tcf_net_ops);
3327 err_register_pernet_subsys:
3328         destroy_workqueue(tc_filter_wq);
3329         return err;
3330 }
3331
3332 subsys_initcall(tc_filter_init);