1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/sched/cls_api.c Packet classifier API. 4 * 5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 6 * 7 * Changes: 8 * 9 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support 10 */ 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/kernel.h> 15 #include <linux/string.h> 16 #include <linux/errno.h> 17 #include <linux/err.h> 18 #include <linux/skbuff.h> 19 #include <linux/init.h> 20 #include <linux/kmod.h> 21 #include <linux/slab.h> 22 #include <linux/idr.h> 23 #include <linux/rhashtable.h> 24 #include <net/net_namespace.h> 25 #include <net/sock.h> 26 #include <net/netlink.h> 27 #include <net/pkt_sched.h> 28 #include <net/pkt_cls.h> 29 #include <net/tc_act/tc_pedit.h> 30 #include <net/tc_act/tc_mirred.h> 31 #include <net/tc_act/tc_vlan.h> 32 #include <net/tc_act/tc_tunnel_key.h> 33 #include <net/tc_act/tc_csum.h> 34 #include <net/tc_act/tc_gact.h> 35 #include <net/tc_act/tc_police.h> 36 #include <net/tc_act/tc_sample.h> 37 #include <net/tc_act/tc_skbedit.h> 38 #include <net/tc_act/tc_ct.h> 39 #include <net/tc_act/tc_mpls.h> 40 41 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; 42 43 /* The list of all installed classifier types */ 44 static LIST_HEAD(tcf_proto_base); 45 46 /* Protects list of registered TC modules. It is pure SMP lock. */ 47 static DEFINE_RWLOCK(cls_mod_lock); 48 49 /* Find classifier type by string name */ 50 51 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) 52 { 53 const struct tcf_proto_ops *t, *res = NULL; 54 55 if (kind) { 56 read_lock(&cls_mod_lock); 57 list_for_each_entry(t, &tcf_proto_base, head) { 58 if (strcmp(kind, t->kind) == 0) { 59 if (try_module_get(t->owner)) 60 res = t; 61 break; 62 } 63 } 64 read_unlock(&cls_mod_lock); 65 } 66 return res; 67 } 68 69 static const struct tcf_proto_ops * 70 tcf_proto_lookup_ops(const char *kind, bool rtnl_held, 71 struct netlink_ext_ack *extack) 72 { 73 const struct tcf_proto_ops *ops; 74 75 ops = __tcf_proto_lookup_ops(kind); 76 if (ops) 77 return ops; 78 #ifdef CONFIG_MODULES 79 if (rtnl_held) 80 rtnl_unlock(); 81 request_module("cls_%s", kind); 82 if (rtnl_held) 83 rtnl_lock(); 84 ops = __tcf_proto_lookup_ops(kind); 85 /* We dropped the RTNL semaphore in order to perform 86 * the module load. So, even if we succeeded in loading 87 * the module we have to replay the request. We indicate 88 * this using -EAGAIN. 89 */ 90 if (ops) { 91 module_put(ops->owner); 92 return ERR_PTR(-EAGAIN); 93 } 94 #endif 95 NL_SET_ERR_MSG(extack, "TC classifier not found"); 96 return ERR_PTR(-ENOENT); 97 } 98 99 /* Register(unregister) new classifier type */ 100 101 int register_tcf_proto_ops(struct tcf_proto_ops *ops) 102 { 103 struct tcf_proto_ops *t; 104 int rc = -EEXIST; 105 106 write_lock(&cls_mod_lock); 107 list_for_each_entry(t, &tcf_proto_base, head) 108 if (!strcmp(ops->kind, t->kind)) 109 goto out; 110 111 list_add_tail(&ops->head, &tcf_proto_base); 112 rc = 0; 113 out: 114 write_unlock(&cls_mod_lock); 115 return rc; 116 } 117 EXPORT_SYMBOL(register_tcf_proto_ops); 118 119 static struct workqueue_struct *tc_filter_wq; 120 121 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) 122 { 123 struct tcf_proto_ops *t; 124 int rc = -ENOENT; 125 126 /* Wait for outstanding call_rcu()s, if any, from a 127 * tcf_proto_ops's destroy() handler. 128 */ 129 rcu_barrier(); 130 flush_workqueue(tc_filter_wq); 131 132 write_lock(&cls_mod_lock); 133 list_for_each_entry(t, &tcf_proto_base, head) { 134 if (t == ops) { 135 list_del(&t->head); 136 rc = 0; 137 break; 138 } 139 } 140 write_unlock(&cls_mod_lock); 141 return rc; 142 } 143 EXPORT_SYMBOL(unregister_tcf_proto_ops); 144 145 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) 146 { 147 INIT_RCU_WORK(rwork, func); 148 return queue_rcu_work(tc_filter_wq, rwork); 149 } 150 EXPORT_SYMBOL(tcf_queue_work); 151 152 /* Select new prio value from the range, managed by kernel. */ 153 154 static inline u32 tcf_auto_prio(struct tcf_proto *tp) 155 { 156 u32 first = TC_H_MAKE(0xC0000000U, 0U); 157 158 if (tp) 159 first = tp->prio - 1; 160 161 return TC_H_MAJ(first); 162 } 163 164 static bool tcf_proto_is_unlocked(const char *kind) 165 { 166 const struct tcf_proto_ops *ops; 167 bool ret; 168 169 ops = tcf_proto_lookup_ops(kind, false, NULL); 170 /* On error return false to take rtnl lock. Proto lookup/create 171 * functions will perform lookup again and properly handle errors. 172 */ 173 if (IS_ERR(ops)) 174 return false; 175 176 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED); 177 module_put(ops->owner); 178 return ret; 179 } 180 181 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, 182 u32 prio, struct tcf_chain *chain, 183 bool rtnl_held, 184 struct netlink_ext_ack *extack) 185 { 186 struct tcf_proto *tp; 187 int err; 188 189 tp = kzalloc(sizeof(*tp), GFP_KERNEL); 190 if (!tp) 191 return ERR_PTR(-ENOBUFS); 192 193 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack); 194 if (IS_ERR(tp->ops)) { 195 err = PTR_ERR(tp->ops); 196 goto errout; 197 } 198 tp->classify = tp->ops->classify; 199 tp->protocol = protocol; 200 tp->prio = prio; 201 tp->chain = chain; 202 spin_lock_init(&tp->lock); 203 refcount_set(&tp->refcnt, 1); 204 205 err = tp->ops->init(tp); 206 if (err) { 207 module_put(tp->ops->owner); 208 goto errout; 209 } 210 return tp; 211 212 errout: 213 kfree(tp); 214 return ERR_PTR(err); 215 } 216 217 static void tcf_proto_get(struct tcf_proto *tp) 218 { 219 refcount_inc(&tp->refcnt); 220 } 221 222 static void tcf_chain_put(struct tcf_chain *chain); 223 224 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, 225 struct netlink_ext_ack *extack) 226 { 227 tp->ops->destroy(tp, rtnl_held, extack); 228 tcf_chain_put(tp->chain); 229 module_put(tp->ops->owner); 230 kfree_rcu(tp, rcu); 231 } 232 233 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held, 234 struct netlink_ext_ack *extack) 235 { 236 if (refcount_dec_and_test(&tp->refcnt)) 237 tcf_proto_destroy(tp, rtnl_held, extack); 238 } 239 240 static int walker_check_empty(struct tcf_proto *tp, void *fh, 241 struct tcf_walker *arg) 242 { 243 if (fh) { 244 arg->nonempty = true; 245 return -1; 246 } 247 return 0; 248 } 249 250 static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held) 251 { 252 struct tcf_walker walker = { .fn = walker_check_empty, }; 253 254 if (tp->ops->walk) { 255 tp->ops->walk(tp, &walker, rtnl_held); 256 return !walker.nonempty; 257 } 258 return true; 259 } 260 261 static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held) 262 { 263 spin_lock(&tp->lock); 264 if (tcf_proto_is_empty(tp, rtnl_held)) 265 tp->deleting = true; 266 spin_unlock(&tp->lock); 267 return tp->deleting; 268 } 269 270 static void tcf_proto_mark_delete(struct tcf_proto *tp) 271 { 272 spin_lock(&tp->lock); 273 tp->deleting = true; 274 spin_unlock(&tp->lock); 275 } 276 277 static bool tcf_proto_is_deleting(struct tcf_proto *tp) 278 { 279 bool deleting; 280 281 spin_lock(&tp->lock); 282 deleting = tp->deleting; 283 spin_unlock(&tp->lock); 284 285 return deleting; 286 } 287 288 #define ASSERT_BLOCK_LOCKED(block) \ 289 lockdep_assert_held(&(block)->lock) 290 291 struct tcf_filter_chain_list_item { 292 struct list_head list; 293 tcf_chain_head_change_t *chain_head_change; 294 void *chain_head_change_priv; 295 }; 296 297 static struct tcf_chain *tcf_chain_create(struct tcf_block *block, 298 u32 chain_index) 299 { 300 struct tcf_chain *chain; 301 302 ASSERT_BLOCK_LOCKED(block); 303 304 chain = kzalloc(sizeof(*chain), GFP_KERNEL); 305 if (!chain) 306 return NULL; 307 list_add_tail(&chain->list, &block->chain_list); 308 mutex_init(&chain->filter_chain_lock); 309 chain->block = block; 310 chain->index = chain_index; 311 chain->refcnt = 1; 312 if (!chain->index) 313 block->chain0.chain = chain; 314 return chain; 315 } 316 317 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, 318 struct tcf_proto *tp_head) 319 { 320 if (item->chain_head_change) 321 item->chain_head_change(tp_head, item->chain_head_change_priv); 322 } 323 324 static void tcf_chain0_head_change(struct tcf_chain *chain, 325 struct tcf_proto *tp_head) 326 { 327 struct tcf_filter_chain_list_item *item; 328 struct tcf_block *block = chain->block; 329 330 if (chain->index) 331 return; 332 333 mutex_lock(&block->lock); 334 list_for_each_entry(item, &block->chain0.filter_chain_list, list) 335 tcf_chain_head_change_item(item, tp_head); 336 mutex_unlock(&block->lock); 337 } 338 339 /* Returns true if block can be safely freed. */ 340 341 static bool tcf_chain_detach(struct tcf_chain *chain) 342 { 343 struct tcf_block *block = chain->block; 344 345 ASSERT_BLOCK_LOCKED(block); 346 347 list_del(&chain->list); 348 if (!chain->index) 349 block->chain0.chain = NULL; 350 351 if (list_empty(&block->chain_list) && 352 refcount_read(&block->refcnt) == 0) 353 return true; 354 355 return false; 356 } 357 358 static void tcf_block_destroy(struct tcf_block *block) 359 { 360 mutex_destroy(&block->lock); 361 kfree_rcu(block, rcu); 362 } 363 364 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block) 365 { 366 struct tcf_block *block = chain->block; 367 368 mutex_destroy(&chain->filter_chain_lock); 369 kfree_rcu(chain, rcu); 370 if (free_block) 371 tcf_block_destroy(block); 372 } 373 374 static void tcf_chain_hold(struct tcf_chain *chain) 375 { 376 ASSERT_BLOCK_LOCKED(chain->block); 377 378 ++chain->refcnt; 379 } 380 381 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) 382 { 383 ASSERT_BLOCK_LOCKED(chain->block); 384 385 /* In case all the references are action references, this 386 * chain should not be shown to the user. 387 */ 388 return chain->refcnt == chain->action_refcnt; 389 } 390 391 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, 392 u32 chain_index) 393 { 394 struct tcf_chain *chain; 395 396 ASSERT_BLOCK_LOCKED(block); 397 398 list_for_each_entry(chain, &block->chain_list, list) { 399 if (chain->index == chain_index) 400 return chain; 401 } 402 return NULL; 403 } 404 405 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, 406 u32 seq, u16 flags, int event, bool unicast); 407 408 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, 409 u32 chain_index, bool create, 410 bool by_act) 411 { 412 struct tcf_chain *chain = NULL; 413 bool is_first_reference; 414 415 mutex_lock(&block->lock); 416 chain = tcf_chain_lookup(block, chain_index); 417 if (chain) { 418 tcf_chain_hold(chain); 419 } else { 420 if (!create) 421 goto errout; 422 chain = tcf_chain_create(block, chain_index); 423 if (!chain) 424 goto errout; 425 } 426 427 if (by_act) 428 ++chain->action_refcnt; 429 is_first_reference = chain->refcnt - chain->action_refcnt == 1; 430 mutex_unlock(&block->lock); 431 432 /* Send notification only in case we got the first 433 * non-action reference. Until then, the chain acts only as 434 * a placeholder for actions pointing to it and user ought 435 * not know about them. 436 */ 437 if (is_first_reference && !by_act) 438 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, 439 RTM_NEWCHAIN, false); 440 441 return chain; 442 443 errout: 444 mutex_unlock(&block->lock); 445 return chain; 446 } 447 448 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, 449 bool create) 450 { 451 return __tcf_chain_get(block, chain_index, create, false); 452 } 453 454 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) 455 { 456 return __tcf_chain_get(block, chain_index, true, true); 457 } 458 EXPORT_SYMBOL(tcf_chain_get_by_act); 459 460 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, 461 void *tmplt_priv); 462 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, 463 void *tmplt_priv, u32 chain_index, 464 struct tcf_block *block, struct sk_buff *oskb, 465 u32 seq, u16 flags, bool unicast); 466 467 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act, 468 bool explicitly_created) 469 { 470 struct tcf_block *block = chain->block; 471 const struct tcf_proto_ops *tmplt_ops; 472 bool free_block = false; 473 unsigned int refcnt; 474 void *tmplt_priv; 475 476 mutex_lock(&block->lock); 477 if (explicitly_created) { 478 if (!chain->explicitly_created) { 479 mutex_unlock(&block->lock); 480 return; 481 } 482 chain->explicitly_created = false; 483 } 484 485 if (by_act) 486 chain->action_refcnt--; 487 488 /* tc_chain_notify_delete can't be called while holding block lock. 489 * However, when block is unlocked chain can be changed concurrently, so 490 * save these to temporary variables. 491 */ 492 refcnt = --chain->refcnt; 493 tmplt_ops = chain->tmplt_ops; 494 tmplt_priv = chain->tmplt_priv; 495 496 /* The last dropped non-action reference will trigger notification. */ 497 if (refcnt - chain->action_refcnt == 0 && !by_act) { 498 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index, 499 block, NULL, 0, 0, false); 500 /* Last reference to chain, no need to lock. */ 501 chain->flushing = false; 502 } 503 504 if (refcnt == 0) 505 free_block = tcf_chain_detach(chain); 506 mutex_unlock(&block->lock); 507 508 if (refcnt == 0) { 509 tc_chain_tmplt_del(tmplt_ops, tmplt_priv); 510 tcf_chain_destroy(chain, free_block); 511 } 512 } 513 514 static void tcf_chain_put(struct tcf_chain *chain) 515 { 516 __tcf_chain_put(chain, false, false); 517 } 518 519 void tcf_chain_put_by_act(struct tcf_chain *chain) 520 { 521 __tcf_chain_put(chain, true, false); 522 } 523 EXPORT_SYMBOL(tcf_chain_put_by_act); 524 525 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) 526 { 527 __tcf_chain_put(chain, false, true); 528 } 529 530 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held) 531 { 532 struct tcf_proto *tp, *tp_next; 533 534 mutex_lock(&chain->filter_chain_lock); 535 tp = tcf_chain_dereference(chain->filter_chain, chain); 536 RCU_INIT_POINTER(chain->filter_chain, NULL); 537 tcf_chain0_head_change(chain, NULL); 538 chain->flushing = true; 539 mutex_unlock(&chain->filter_chain_lock); 540 541 while (tp) { 542 tp_next = rcu_dereference_protected(tp->next, 1); 543 tcf_proto_put(tp, rtnl_held, NULL); 544 tp = tp_next; 545 } 546 } 547 548 static struct tcf_block *tc_dev_ingress_block(struct net_device *dev) 549 { 550 const struct Qdisc_class_ops *cops; 551 struct Qdisc *qdisc; 552 553 if (!dev_ingress_queue(dev)) 554 return NULL; 555 556 qdisc = dev_ingress_queue(dev)->qdisc_sleeping; 557 if (!qdisc) 558 return NULL; 559 560 cops = qdisc->ops->cl_ops; 561 if (!cops) 562 return NULL; 563 564 if (!cops->tcf_block) 565 return NULL; 566 567 return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL); 568 } 569 570 static struct rhashtable indr_setup_block_ht; 571 572 struct tc_indr_block_dev { 573 struct rhash_head ht_node; 574 struct net_device *dev; 575 unsigned int refcnt; 576 struct list_head cb_list; 577 struct tcf_block *block; 578 }; 579 580 struct tc_indr_block_cb { 581 struct list_head list; 582 void *cb_priv; 583 tc_indr_block_bind_cb_t *cb; 584 void *cb_ident; 585 }; 586 587 static const struct rhashtable_params tc_indr_setup_block_ht_params = { 588 .key_offset = offsetof(struct tc_indr_block_dev, dev), 589 .head_offset = offsetof(struct tc_indr_block_dev, ht_node), 590 .key_len = sizeof(struct net_device *), 591 }; 592 593 static struct tc_indr_block_dev * 594 tc_indr_block_dev_lookup(struct net_device *dev) 595 { 596 return rhashtable_lookup_fast(&indr_setup_block_ht, &dev, 597 tc_indr_setup_block_ht_params); 598 } 599 600 static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev) 601 { 602 struct tc_indr_block_dev *indr_dev; 603 604 indr_dev = tc_indr_block_dev_lookup(dev); 605 if (indr_dev) 606 goto inc_ref; 607 608 indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL); 609 if (!indr_dev) 610 return NULL; 611 612 INIT_LIST_HEAD(&indr_dev->cb_list); 613 indr_dev->dev = dev; 614 indr_dev->block = tc_dev_ingress_block(dev); 615 if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node, 616 tc_indr_setup_block_ht_params)) { 617 kfree(indr_dev); 618 return NULL; 619 } 620 621 inc_ref: 622 indr_dev->refcnt++; 623 return indr_dev; 624 } 625 626 static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev) 627 { 628 if (--indr_dev->refcnt) 629 return; 630 631 rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node, 632 tc_indr_setup_block_ht_params); 633 kfree(indr_dev); 634 } 635 636 static struct tc_indr_block_cb * 637 tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev, 638 tc_indr_block_bind_cb_t *cb, void *cb_ident) 639 { 640 struct tc_indr_block_cb *indr_block_cb; 641 642 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) 643 if (indr_block_cb->cb == cb && 644 indr_block_cb->cb_ident == cb_ident) 645 return indr_block_cb; 646 return NULL; 647 } 648 649 static struct tc_indr_block_cb * 650 tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv, 651 tc_indr_block_bind_cb_t *cb, void *cb_ident) 652 { 653 struct tc_indr_block_cb *indr_block_cb; 654 655 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); 656 if (indr_block_cb) 657 return ERR_PTR(-EEXIST); 658 659 indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL); 660 if (!indr_block_cb) 661 return ERR_PTR(-ENOMEM); 662 663 indr_block_cb->cb_priv = cb_priv; 664 indr_block_cb->cb = cb; 665 indr_block_cb->cb_ident = cb_ident; 666 list_add(&indr_block_cb->list, &indr_dev->cb_list); 667 668 return indr_block_cb; 669 } 670 671 static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb) 672 { 673 list_del(&indr_block_cb->list); 674 kfree(indr_block_cb); 675 } 676 677 static int tcf_block_setup(struct tcf_block *block, 678 struct flow_block_offload *bo); 679 680 static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev, 681 struct tc_indr_block_cb *indr_block_cb, 682 enum flow_block_command command) 683 { 684 struct flow_block_offload bo = { 685 .command = command, 686 .binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS, 687 .net = dev_net(indr_dev->dev), 688 .block_shared = tcf_block_non_null_shared(indr_dev->block), 689 }; 690 INIT_LIST_HEAD(&bo.cb_list); 691 692 if (!indr_dev->block) 693 return; 694 695 bo.block = &indr_dev->block->flow_block; 696 697 indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, 698 &bo); 699 tcf_block_setup(indr_dev->block, &bo); 700 } 701 702 int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, 703 tc_indr_block_bind_cb_t *cb, void *cb_ident) 704 { 705 struct tc_indr_block_cb *indr_block_cb; 706 struct tc_indr_block_dev *indr_dev; 707 int err; 708 709 indr_dev = tc_indr_block_dev_get(dev); 710 if (!indr_dev) 711 return -ENOMEM; 712 713 indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident); 714 err = PTR_ERR_OR_ZERO(indr_block_cb); 715 if (err) 716 goto err_dev_put; 717 718 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, FLOW_BLOCK_BIND); 719 return 0; 720 721 err_dev_put: 722 tc_indr_block_dev_put(indr_dev); 723 return err; 724 } 725 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register); 726 727 int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, 728 tc_indr_block_bind_cb_t *cb, void *cb_ident) 729 { 730 int err; 731 732 rtnl_lock(); 733 err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident); 734 rtnl_unlock(); 735 736 return err; 737 } 738 EXPORT_SYMBOL_GPL(tc_indr_block_cb_register); 739 740 void __tc_indr_block_cb_unregister(struct net_device *dev, 741 tc_indr_block_bind_cb_t *cb, void *cb_ident) 742 { 743 struct tc_indr_block_cb *indr_block_cb; 744 struct tc_indr_block_dev *indr_dev; 745 746 indr_dev = tc_indr_block_dev_lookup(dev); 747 if (!indr_dev) 748 return; 749 750 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); 751 if (!indr_block_cb) 752 return; 753 754 /* Send unbind message if required to free any block cbs. */ 755 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, FLOW_BLOCK_UNBIND); 756 tc_indr_block_cb_del(indr_block_cb); 757 tc_indr_block_dev_put(indr_dev); 758 } 759 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister); 760 761 void tc_indr_block_cb_unregister(struct net_device *dev, 762 tc_indr_block_bind_cb_t *cb, void *cb_ident) 763 { 764 rtnl_lock(); 765 __tc_indr_block_cb_unregister(dev, cb, cb_ident); 766 rtnl_unlock(); 767 } 768 EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister); 769 770 static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev, 771 struct tcf_block_ext_info *ei, 772 enum flow_block_command command, 773 struct netlink_ext_ack *extack) 774 { 775 struct tc_indr_block_cb *indr_block_cb; 776 struct tc_indr_block_dev *indr_dev; 777 struct flow_block_offload bo = { 778 .command = command, 779 .binder_type = ei->binder_type, 780 .net = dev_net(dev), 781 .block = &block->flow_block, 782 .block_shared = tcf_block_shared(block), 783 .extack = extack, 784 }; 785 INIT_LIST_HEAD(&bo.cb_list); 786 787 indr_dev = tc_indr_block_dev_lookup(dev); 788 if (!indr_dev) 789 return; 790 791 indr_dev->block = command == FLOW_BLOCK_BIND ? block : NULL; 792 793 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) 794 indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, 795 &bo); 796 797 tcf_block_setup(block, &bo); 798 } 799 800 static bool tcf_block_offload_in_use(struct tcf_block *block) 801 { 802 return block->offloadcnt; 803 } 804 805 static int tcf_block_offload_cmd(struct tcf_block *block, 806 struct net_device *dev, 807 struct tcf_block_ext_info *ei, 808 enum flow_block_command command, 809 struct netlink_ext_ack *extack) 810 { 811 struct flow_block_offload bo = {}; 812 int err; 813 814 bo.net = dev_net(dev); 815 bo.command = command; 816 bo.binder_type = ei->binder_type; 817 bo.block = &block->flow_block; 818 bo.block_shared = tcf_block_shared(block); 819 bo.extack = extack; 820 INIT_LIST_HEAD(&bo.cb_list); 821 822 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); 823 if (err < 0) 824 return err; 825 826 return tcf_block_setup(block, &bo); 827 } 828 829 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, 830 struct tcf_block_ext_info *ei, 831 struct netlink_ext_ack *extack) 832 { 833 struct net_device *dev = q->dev_queue->dev; 834 int err; 835 836 if (!dev->netdev_ops->ndo_setup_tc) 837 goto no_offload_dev_inc; 838 839 /* If tc offload feature is disabled and the block we try to bind 840 * to already has some offloaded filters, forbid to bind. 841 */ 842 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { 843 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); 844 return -EOPNOTSUPP; 845 } 846 847 err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_BIND, extack); 848 if (err == -EOPNOTSUPP) 849 goto no_offload_dev_inc; 850 if (err) 851 return err; 852 853 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); 854 return 0; 855 856 no_offload_dev_inc: 857 if (tcf_block_offload_in_use(block)) 858 return -EOPNOTSUPP; 859 block->nooffloaddevcnt++; 860 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); 861 return 0; 862 } 863 864 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, 865 struct tcf_block_ext_info *ei) 866 { 867 struct net_device *dev = q->dev_queue->dev; 868 int err; 869 870 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); 871 872 if (!dev->netdev_ops->ndo_setup_tc) 873 goto no_offload_dev_dec; 874 err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); 875 if (err == -EOPNOTSUPP) 876 goto no_offload_dev_dec; 877 return; 878 879 no_offload_dev_dec: 880 WARN_ON(block->nooffloaddevcnt-- == 0); 881 } 882 883 static int 884 tcf_chain0_head_change_cb_add(struct tcf_block *block, 885 struct tcf_block_ext_info *ei, 886 struct netlink_ext_ack *extack) 887 { 888 struct tcf_filter_chain_list_item *item; 889 struct tcf_chain *chain0; 890 891 item = kmalloc(sizeof(*item), GFP_KERNEL); 892 if (!item) { 893 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); 894 return -ENOMEM; 895 } 896 item->chain_head_change = ei->chain_head_change; 897 item->chain_head_change_priv = ei->chain_head_change_priv; 898 899 mutex_lock(&block->lock); 900 chain0 = block->chain0.chain; 901 if (chain0) 902 tcf_chain_hold(chain0); 903 else 904 list_add(&item->list, &block->chain0.filter_chain_list); 905 mutex_unlock(&block->lock); 906 907 if (chain0) { 908 struct tcf_proto *tp_head; 909 910 mutex_lock(&chain0->filter_chain_lock); 911 912 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0); 913 if (tp_head) 914 tcf_chain_head_change_item(item, tp_head); 915 916 mutex_lock(&block->lock); 917 list_add(&item->list, &block->chain0.filter_chain_list); 918 mutex_unlock(&block->lock); 919 920 mutex_unlock(&chain0->filter_chain_lock); 921 tcf_chain_put(chain0); 922 } 923 924 return 0; 925 } 926 927 static void 928 tcf_chain0_head_change_cb_del(struct tcf_block *block, 929 struct tcf_block_ext_info *ei) 930 { 931 struct tcf_filter_chain_list_item *item; 932 933 mutex_lock(&block->lock); 934 list_for_each_entry(item, &block->chain0.filter_chain_list, list) { 935 if ((!ei->chain_head_change && !ei->chain_head_change_priv) || 936 (item->chain_head_change == ei->chain_head_change && 937 item->chain_head_change_priv == ei->chain_head_change_priv)) { 938 if (block->chain0.chain) 939 tcf_chain_head_change_item(item, NULL); 940 list_del(&item->list); 941 mutex_unlock(&block->lock); 942 943 kfree(item); 944 return; 945 } 946 } 947 mutex_unlock(&block->lock); 948 WARN_ON(1); 949 } 950 951 struct tcf_net { 952 spinlock_t idr_lock; /* Protects idr */ 953 struct idr idr; 954 }; 955 956 static unsigned int tcf_net_id; 957 958 static int tcf_block_insert(struct tcf_block *block, struct net *net, 959 struct netlink_ext_ack *extack) 960 { 961 struct tcf_net *tn = net_generic(net, tcf_net_id); 962 int err; 963 964 idr_preload(GFP_KERNEL); 965 spin_lock(&tn->idr_lock); 966 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, 967 GFP_NOWAIT); 968 spin_unlock(&tn->idr_lock); 969 idr_preload_end(); 970 971 return err; 972 } 973 974 static void tcf_block_remove(struct tcf_block *block, struct net *net) 975 { 976 struct tcf_net *tn = net_generic(net, tcf_net_id); 977 978 spin_lock(&tn->idr_lock); 979 idr_remove(&tn->idr, block->index); 980 spin_unlock(&tn->idr_lock); 981 } 982 983 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, 984 u32 block_index, 985 struct netlink_ext_ack *extack) 986 { 987 struct tcf_block *block; 988 989 block = kzalloc(sizeof(*block), GFP_KERNEL); 990 if (!block) { 991 NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); 992 return ERR_PTR(-ENOMEM); 993 } 994 mutex_init(&block->lock); 995 flow_block_init(&block->flow_block); 996 INIT_LIST_HEAD(&block->chain_list); 997 INIT_LIST_HEAD(&block->owner_list); 998 INIT_LIST_HEAD(&block->chain0.filter_chain_list); 999 1000 refcount_set(&block->refcnt, 1); 1001 block->net = net; 1002 block->index = block_index; 1003 1004 /* Don't store q pointer for blocks which are shared */ 1005 if (!tcf_block_shared(block)) 1006 block->q = q; 1007 return block; 1008 } 1009 1010 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) 1011 { 1012 struct tcf_net *tn = net_generic(net, tcf_net_id); 1013 1014 return idr_find(&tn->idr, block_index); 1015 } 1016 1017 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) 1018 { 1019 struct tcf_block *block; 1020 1021 rcu_read_lock(); 1022 block = tcf_block_lookup(net, block_index); 1023 if (block && !refcount_inc_not_zero(&block->refcnt)) 1024 block = NULL; 1025 rcu_read_unlock(); 1026 1027 return block; 1028 } 1029 1030 static struct tcf_chain * 1031 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) 1032 { 1033 mutex_lock(&block->lock); 1034 if (chain) 1035 chain = list_is_last(&chain->list, &block->chain_list) ? 1036 NULL : list_next_entry(chain, list); 1037 else 1038 chain = list_first_entry_or_null(&block->chain_list, 1039 struct tcf_chain, list); 1040 1041 /* skip all action-only chains */ 1042 while (chain && tcf_chain_held_by_acts_only(chain)) 1043 chain = list_is_last(&chain->list, &block->chain_list) ? 1044 NULL : list_next_entry(chain, list); 1045 1046 if (chain) 1047 tcf_chain_hold(chain); 1048 mutex_unlock(&block->lock); 1049 1050 return chain; 1051 } 1052 1053 /* Function to be used by all clients that want to iterate over all chains on 1054 * block. It properly obtains block->lock and takes reference to chain before 1055 * returning it. Users of this function must be tolerant to concurrent chain 1056 * insertion/deletion or ensure that no concurrent chain modification is 1057 * possible. Note that all netlink dump callbacks cannot guarantee to provide 1058 * consistent dump because rtnl lock is released each time skb is filled with 1059 * data and sent to user-space. 1060 */ 1061 1062 struct tcf_chain * 1063 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) 1064 { 1065 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain); 1066 1067 if (chain) 1068 tcf_chain_put(chain); 1069 1070 return chain_next; 1071 } 1072 EXPORT_SYMBOL(tcf_get_next_chain); 1073 1074 static struct tcf_proto * 1075 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) 1076 { 1077 u32 prio = 0; 1078 1079 ASSERT_RTNL(); 1080 mutex_lock(&chain->filter_chain_lock); 1081 1082 if (!tp) { 1083 tp = tcf_chain_dereference(chain->filter_chain, chain); 1084 } else if (tcf_proto_is_deleting(tp)) { 1085 /* 'deleting' flag is set and chain->filter_chain_lock was 1086 * unlocked, which means next pointer could be invalid. Restart 1087 * search. 1088 */ 1089 prio = tp->prio + 1; 1090 tp = tcf_chain_dereference(chain->filter_chain, chain); 1091 1092 for (; tp; tp = tcf_chain_dereference(tp->next, chain)) 1093 if (!tp->deleting && tp->prio >= prio) 1094 break; 1095 } else { 1096 tp = tcf_chain_dereference(tp->next, chain); 1097 } 1098 1099 if (tp) 1100 tcf_proto_get(tp); 1101 1102 mutex_unlock(&chain->filter_chain_lock); 1103 1104 return tp; 1105 } 1106 1107 /* Function to be used by all clients that want to iterate over all tp's on 1108 * chain. Users of this function must be tolerant to concurrent tp 1109 * insertion/deletion or ensure that no concurrent chain modification is 1110 * possible. Note that all netlink dump callbacks cannot guarantee to provide 1111 * consistent dump because rtnl lock is released each time skb is filled with 1112 * data and sent to user-space. 1113 */ 1114 1115 struct tcf_proto * 1116 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp, 1117 bool rtnl_held) 1118 { 1119 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp); 1120 1121 if (tp) 1122 tcf_proto_put(tp, rtnl_held, NULL); 1123 1124 return tp_next; 1125 } 1126 EXPORT_SYMBOL(tcf_get_next_proto); 1127 1128 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held) 1129 { 1130 struct tcf_chain *chain; 1131 1132 /* Last reference to block. At this point chains cannot be added or 1133 * removed concurrently. 1134 */ 1135 for (chain = tcf_get_next_chain(block, NULL); 1136 chain; 1137 chain = tcf_get_next_chain(block, chain)) { 1138 tcf_chain_put_explicitly_created(chain); 1139 tcf_chain_flush(chain, rtnl_held); 1140 } 1141 } 1142 1143 /* Lookup Qdisc and increments its reference counter. 1144 * Set parent, if necessary. 1145 */ 1146 1147 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q, 1148 u32 *parent, int ifindex, bool rtnl_held, 1149 struct netlink_ext_ack *extack) 1150 { 1151 const struct Qdisc_class_ops *cops; 1152 struct net_device *dev; 1153 int err = 0; 1154 1155 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) 1156 return 0; 1157 1158 rcu_read_lock(); 1159 1160 /* Find link */ 1161 dev = dev_get_by_index_rcu(net, ifindex); 1162 if (!dev) { 1163 rcu_read_unlock(); 1164 return -ENODEV; 1165 } 1166 1167 /* Find qdisc */ 1168 if (!*parent) { 1169 *q = dev->qdisc; 1170 *parent = (*q)->handle; 1171 } else { 1172 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); 1173 if (!*q) { 1174 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); 1175 err = -EINVAL; 1176 goto errout_rcu; 1177 } 1178 } 1179 1180 *q = qdisc_refcount_inc_nz(*q); 1181 if (!*q) { 1182 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); 1183 err = -EINVAL; 1184 goto errout_rcu; 1185 } 1186 1187 /* Is it classful? */ 1188 cops = (*q)->ops->cl_ops; 1189 if (!cops) { 1190 NL_SET_ERR_MSG(extack, "Qdisc not classful"); 1191 err = -EINVAL; 1192 goto errout_qdisc; 1193 } 1194 1195 if (!cops->tcf_block) { 1196 NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); 1197 err = -EOPNOTSUPP; 1198 goto errout_qdisc; 1199 } 1200 1201 errout_rcu: 1202 /* At this point we know that qdisc is not noop_qdisc, 1203 * which means that qdisc holds a reference to net_device 1204 * and we hold a reference to qdisc, so it is safe to release 1205 * rcu read lock. 1206 */ 1207 rcu_read_unlock(); 1208 return err; 1209 1210 errout_qdisc: 1211 rcu_read_unlock(); 1212 1213 if (rtnl_held) 1214 qdisc_put(*q); 1215 else 1216 qdisc_put_unlocked(*q); 1217 *q = NULL; 1218 1219 return err; 1220 } 1221 1222 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl, 1223 int ifindex, struct netlink_ext_ack *extack) 1224 { 1225 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) 1226 return 0; 1227 1228 /* Do we search for filter, attached to class? */ 1229 if (TC_H_MIN(parent)) { 1230 const struct Qdisc_class_ops *cops = q->ops->cl_ops; 1231 1232 *cl = cops->find(q, parent); 1233 if (*cl == 0) { 1234 NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); 1235 return -ENOENT; 1236 } 1237 } 1238 1239 return 0; 1240 } 1241 1242 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q, 1243 unsigned long cl, int ifindex, 1244 u32 block_index, 1245 struct netlink_ext_ack *extack) 1246 { 1247 struct tcf_block *block; 1248 1249 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { 1250 block = tcf_block_refcnt_get(net, block_index); 1251 if (!block) { 1252 NL_SET_ERR_MSG(extack, "Block of given index was not found"); 1253 return ERR_PTR(-EINVAL); 1254 } 1255 } else { 1256 const struct Qdisc_class_ops *cops = q->ops->cl_ops; 1257 1258 block = cops->tcf_block(q, cl, extack); 1259 if (!block) 1260 return ERR_PTR(-EINVAL); 1261 1262 if (tcf_block_shared(block)) { 1263 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); 1264 return ERR_PTR(-EOPNOTSUPP); 1265 } 1266 1267 /* Always take reference to block in order to support execution 1268 * of rules update path of cls API without rtnl lock. Caller 1269 * must release block when it is finished using it. 'if' block 1270 * of this conditional obtain reference to block by calling 1271 * tcf_block_refcnt_get(). 1272 */ 1273 refcount_inc(&block->refcnt); 1274 } 1275 1276 return block; 1277 } 1278 1279 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, 1280 struct tcf_block_ext_info *ei, bool rtnl_held) 1281 { 1282 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) { 1283 /* Flushing/putting all chains will cause the block to be 1284 * deallocated when last chain is freed. However, if chain_list 1285 * is empty, block has to be manually deallocated. After block 1286 * reference counter reached 0, it is no longer possible to 1287 * increment it or add new chains to block. 1288 */ 1289 bool free_block = list_empty(&block->chain_list); 1290 1291 mutex_unlock(&block->lock); 1292 if (tcf_block_shared(block)) 1293 tcf_block_remove(block, block->net); 1294 1295 if (q) 1296 tcf_block_offload_unbind(block, q, ei); 1297 1298 if (free_block) 1299 tcf_block_destroy(block); 1300 else 1301 tcf_block_flush_all_chains(block, rtnl_held); 1302 } else if (q) { 1303 tcf_block_offload_unbind(block, q, ei); 1304 } 1305 } 1306 1307 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held) 1308 { 1309 __tcf_block_put(block, NULL, NULL, rtnl_held); 1310 } 1311 1312 /* Find tcf block. 1313 * Set q, parent, cl when appropriate. 1314 */ 1315 1316 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, 1317 u32 *parent, unsigned long *cl, 1318 int ifindex, u32 block_index, 1319 struct netlink_ext_ack *extack) 1320 { 1321 struct tcf_block *block; 1322 int err = 0; 1323 1324 ASSERT_RTNL(); 1325 1326 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack); 1327 if (err) 1328 goto errout; 1329 1330 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack); 1331 if (err) 1332 goto errout_qdisc; 1333 1334 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack); 1335 if (IS_ERR(block)) { 1336 err = PTR_ERR(block); 1337 goto errout_qdisc; 1338 } 1339 1340 return block; 1341 1342 errout_qdisc: 1343 if (*q) 1344 qdisc_put(*q); 1345 errout: 1346 *q = NULL; 1347 return ERR_PTR(err); 1348 } 1349 1350 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block, 1351 bool rtnl_held) 1352 { 1353 if (!IS_ERR_OR_NULL(block)) 1354 tcf_block_refcnt_put(block, rtnl_held); 1355 1356 if (q) { 1357 if (rtnl_held) 1358 qdisc_put(q); 1359 else 1360 qdisc_put_unlocked(q); 1361 } 1362 } 1363 1364 struct tcf_block_owner_item { 1365 struct list_head list; 1366 struct Qdisc *q; 1367 enum flow_block_binder_type binder_type; 1368 }; 1369 1370 static void 1371 tcf_block_owner_netif_keep_dst(struct tcf_block *block, 1372 struct Qdisc *q, 1373 enum flow_block_binder_type binder_type) 1374 { 1375 if (block->keep_dst && 1376 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS && 1377 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS) 1378 netif_keep_dst(qdisc_dev(q)); 1379 } 1380 1381 void tcf_block_netif_keep_dst(struct tcf_block *block) 1382 { 1383 struct tcf_block_owner_item *item; 1384 1385 block->keep_dst = true; 1386 list_for_each_entry(item, &block->owner_list, list) 1387 tcf_block_owner_netif_keep_dst(block, item->q, 1388 item->binder_type); 1389 } 1390 EXPORT_SYMBOL(tcf_block_netif_keep_dst); 1391 1392 static int tcf_block_owner_add(struct tcf_block *block, 1393 struct Qdisc *q, 1394 enum flow_block_binder_type binder_type) 1395 { 1396 struct tcf_block_owner_item *item; 1397 1398 item = kmalloc(sizeof(*item), GFP_KERNEL); 1399 if (!item) 1400 return -ENOMEM; 1401 item->q = q; 1402 item->binder_type = binder_type; 1403 list_add(&item->list, &block->owner_list); 1404 return 0; 1405 } 1406 1407 static void tcf_block_owner_del(struct tcf_block *block, 1408 struct Qdisc *q, 1409 enum flow_block_binder_type binder_type) 1410 { 1411 struct tcf_block_owner_item *item; 1412 1413 list_for_each_entry(item, &block->owner_list, list) { 1414 if (item->q == q && item->binder_type == binder_type) { 1415 list_del(&item->list); 1416 kfree(item); 1417 return; 1418 } 1419 } 1420 WARN_ON(1); 1421 } 1422 1423 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, 1424 struct tcf_block_ext_info *ei, 1425 struct netlink_ext_ack *extack) 1426 { 1427 struct net *net = qdisc_net(q); 1428 struct tcf_block *block = NULL; 1429 int err; 1430 1431 if (ei->block_index) 1432 /* block_index not 0 means the shared block is requested */ 1433 block = tcf_block_refcnt_get(net, ei->block_index); 1434 1435 if (!block) { 1436 block = tcf_block_create(net, q, ei->block_index, extack); 1437 if (IS_ERR(block)) 1438 return PTR_ERR(block); 1439 if (tcf_block_shared(block)) { 1440 err = tcf_block_insert(block, net, extack); 1441 if (err) 1442 goto err_block_insert; 1443 } 1444 } 1445 1446 err = tcf_block_owner_add(block, q, ei->binder_type); 1447 if (err) 1448 goto err_block_owner_add; 1449 1450 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); 1451 1452 err = tcf_chain0_head_change_cb_add(block, ei, extack); 1453 if (err) 1454 goto err_chain0_head_change_cb_add; 1455 1456 err = tcf_block_offload_bind(block, q, ei, extack); 1457 if (err) 1458 goto err_block_offload_bind; 1459 1460 *p_block = block; 1461 return 0; 1462 1463 err_block_offload_bind: 1464 tcf_chain0_head_change_cb_del(block, ei); 1465 err_chain0_head_change_cb_add: 1466 tcf_block_owner_del(block, q, ei->binder_type); 1467 err_block_owner_add: 1468 err_block_insert: 1469 tcf_block_refcnt_put(block, true); 1470 return err; 1471 } 1472 EXPORT_SYMBOL(tcf_block_get_ext); 1473 1474 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) 1475 { 1476 struct tcf_proto __rcu **p_filter_chain = priv; 1477 1478 rcu_assign_pointer(*p_filter_chain, tp_head); 1479 } 1480 1481 int tcf_block_get(struct tcf_block **p_block, 1482 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, 1483 struct netlink_ext_ack *extack) 1484 { 1485 struct tcf_block_ext_info ei = { 1486 .chain_head_change = tcf_chain_head_change_dflt, 1487 .chain_head_change_priv = p_filter_chain, 1488 }; 1489 1490 WARN_ON(!p_filter_chain); 1491 return tcf_block_get_ext(p_block, q, &ei, extack); 1492 } 1493 EXPORT_SYMBOL(tcf_block_get); 1494 1495 /* XXX: Standalone actions are not allowed to jump to any chain, and bound 1496 * actions should be all removed after flushing. 1497 */ 1498 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, 1499 struct tcf_block_ext_info *ei) 1500 { 1501 if (!block) 1502 return; 1503 tcf_chain0_head_change_cb_del(block, ei); 1504 tcf_block_owner_del(block, q, ei->binder_type); 1505 1506 __tcf_block_put(block, q, ei, true); 1507 } 1508 EXPORT_SYMBOL(tcf_block_put_ext); 1509 1510 void tcf_block_put(struct tcf_block *block) 1511 { 1512 struct tcf_block_ext_info ei = {0, }; 1513 1514 if (!block) 1515 return; 1516 tcf_block_put_ext(block, block->q, &ei); 1517 } 1518 1519 EXPORT_SYMBOL(tcf_block_put); 1520 1521 static int 1522 tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb, 1523 void *cb_priv, bool add, bool offload_in_use, 1524 struct netlink_ext_ack *extack) 1525 { 1526 struct tcf_chain *chain, *chain_prev; 1527 struct tcf_proto *tp, *tp_prev; 1528 int err; 1529 1530 for (chain = __tcf_get_next_chain(block, NULL); 1531 chain; 1532 chain_prev = chain, 1533 chain = __tcf_get_next_chain(block, chain), 1534 tcf_chain_put(chain_prev)) { 1535 for (tp = __tcf_get_next_proto(chain, NULL); tp; 1536 tp_prev = tp, 1537 tp = __tcf_get_next_proto(chain, tp), 1538 tcf_proto_put(tp_prev, true, NULL)) { 1539 if (tp->ops->reoffload) { 1540 err = tp->ops->reoffload(tp, add, cb, cb_priv, 1541 extack); 1542 if (err && add) 1543 goto err_playback_remove; 1544 } else if (add && offload_in_use) { 1545 err = -EOPNOTSUPP; 1546 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); 1547 goto err_playback_remove; 1548 } 1549 } 1550 } 1551 1552 return 0; 1553 1554 err_playback_remove: 1555 tcf_proto_put(tp, true, NULL); 1556 tcf_chain_put(chain); 1557 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, 1558 extack); 1559 return err; 1560 } 1561 1562 static int tcf_block_bind(struct tcf_block *block, 1563 struct flow_block_offload *bo) 1564 { 1565 struct flow_block_cb *block_cb, *next; 1566 int err, i = 0; 1567 1568 list_for_each_entry(block_cb, &bo->cb_list, list) { 1569 err = tcf_block_playback_offloads(block, block_cb->cb, 1570 block_cb->cb_priv, true, 1571 tcf_block_offload_in_use(block), 1572 bo->extack); 1573 if (err) 1574 goto err_unroll; 1575 1576 i++; 1577 } 1578 list_splice(&bo->cb_list, &block->flow_block.cb_list); 1579 1580 return 0; 1581 1582 err_unroll: 1583 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { 1584 if (i-- > 0) { 1585 list_del(&block_cb->list); 1586 tcf_block_playback_offloads(block, block_cb->cb, 1587 block_cb->cb_priv, false, 1588 tcf_block_offload_in_use(block), 1589 NULL); 1590 } 1591 flow_block_cb_free(block_cb); 1592 } 1593 1594 return err; 1595 } 1596 1597 static void tcf_block_unbind(struct tcf_block *block, 1598 struct flow_block_offload *bo) 1599 { 1600 struct flow_block_cb *block_cb, *next; 1601 1602 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { 1603 tcf_block_playback_offloads(block, block_cb->cb, 1604 block_cb->cb_priv, false, 1605 tcf_block_offload_in_use(block), 1606 NULL); 1607 list_del(&block_cb->list); 1608 flow_block_cb_free(block_cb); 1609 } 1610 } 1611 1612 static int tcf_block_setup(struct tcf_block *block, 1613 struct flow_block_offload *bo) 1614 { 1615 int err; 1616 1617 switch (bo->command) { 1618 case FLOW_BLOCK_BIND: 1619 err = tcf_block_bind(block, bo); 1620 break; 1621 case FLOW_BLOCK_UNBIND: 1622 err = 0; 1623 tcf_block_unbind(block, bo); 1624 break; 1625 default: 1626 WARN_ON_ONCE(1); 1627 err = -EOPNOTSUPP; 1628 } 1629 1630 return err; 1631 } 1632 1633 /* Main classifier routine: scans classifier chain attached 1634 * to this qdisc, (optionally) tests for protocol and asks 1635 * specific classifiers. 1636 */ 1637 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, 1638 struct tcf_result *res, bool compat_mode) 1639 { 1640 #ifdef CONFIG_NET_CLS_ACT 1641 const int max_reclassify_loop = 4; 1642 const struct tcf_proto *orig_tp = tp; 1643 const struct tcf_proto *first_tp; 1644 int limit = 0; 1645 1646 reclassify: 1647 #endif 1648 for (; tp; tp = rcu_dereference_bh(tp->next)) { 1649 __be16 protocol = tc_skb_protocol(skb); 1650 int err; 1651 1652 if (tp->protocol != protocol && 1653 tp->protocol != htons(ETH_P_ALL)) 1654 continue; 1655 1656 err = tp->classify(skb, tp, res); 1657 #ifdef CONFIG_NET_CLS_ACT 1658 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { 1659 first_tp = orig_tp; 1660 goto reset; 1661 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { 1662 first_tp = res->goto_tp; 1663 goto reset; 1664 } 1665 #endif 1666 if (err >= 0) 1667 return err; 1668 } 1669 1670 return TC_ACT_UNSPEC; /* signal: continue lookup */ 1671 #ifdef CONFIG_NET_CLS_ACT 1672 reset: 1673 if (unlikely(limit++ >= max_reclassify_loop)) { 1674 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", 1675 tp->chain->block->index, 1676 tp->prio & 0xffff, 1677 ntohs(tp->protocol)); 1678 return TC_ACT_SHOT; 1679 } 1680 1681 tp = first_tp; 1682 goto reclassify; 1683 #endif 1684 } 1685 EXPORT_SYMBOL(tcf_classify); 1686 1687 struct tcf_chain_info { 1688 struct tcf_proto __rcu **pprev; 1689 struct tcf_proto __rcu *next; 1690 }; 1691 1692 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain, 1693 struct tcf_chain_info *chain_info) 1694 { 1695 return tcf_chain_dereference(*chain_info->pprev, chain); 1696 } 1697 1698 static int tcf_chain_tp_insert(struct tcf_chain *chain, 1699 struct tcf_chain_info *chain_info, 1700 struct tcf_proto *tp) 1701 { 1702 if (chain->flushing) 1703 return -EAGAIN; 1704 1705 if (*chain_info->pprev == chain->filter_chain) 1706 tcf_chain0_head_change(chain, tp); 1707 tcf_proto_get(tp); 1708 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info)); 1709 rcu_assign_pointer(*chain_info->pprev, tp); 1710 1711 return 0; 1712 } 1713 1714 static void tcf_chain_tp_remove(struct tcf_chain *chain, 1715 struct tcf_chain_info *chain_info, 1716 struct tcf_proto *tp) 1717 { 1718 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain); 1719 1720 tcf_proto_mark_delete(tp); 1721 if (tp == chain->filter_chain) 1722 tcf_chain0_head_change(chain, next); 1723 RCU_INIT_POINTER(*chain_info->pprev, next); 1724 } 1725 1726 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, 1727 struct tcf_chain_info *chain_info, 1728 u32 protocol, u32 prio, 1729 bool prio_allocate); 1730 1731 /* Try to insert new proto. 1732 * If proto with specified priority already exists, free new proto 1733 * and return existing one. 1734 */ 1735 1736 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain, 1737 struct tcf_proto *tp_new, 1738 u32 protocol, u32 prio, 1739 bool rtnl_held) 1740 { 1741 struct tcf_chain_info chain_info; 1742 struct tcf_proto *tp; 1743 int err = 0; 1744 1745 mutex_lock(&chain->filter_chain_lock); 1746 1747 tp = tcf_chain_tp_find(chain, &chain_info, 1748 protocol, prio, false); 1749 if (!tp) 1750 err = tcf_chain_tp_insert(chain, &chain_info, tp_new); 1751 mutex_unlock(&chain->filter_chain_lock); 1752 1753 if (tp) { 1754 tcf_proto_destroy(tp_new, rtnl_held, NULL); 1755 tp_new = tp; 1756 } else if (err) { 1757 tcf_proto_destroy(tp_new, rtnl_held, NULL); 1758 tp_new = ERR_PTR(err); 1759 } 1760 1761 return tp_new; 1762 } 1763 1764 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain, 1765 struct tcf_proto *tp, bool rtnl_held, 1766 struct netlink_ext_ack *extack) 1767 { 1768 struct tcf_chain_info chain_info; 1769 struct tcf_proto *tp_iter; 1770 struct tcf_proto **pprev; 1771 struct tcf_proto *next; 1772 1773 mutex_lock(&chain->filter_chain_lock); 1774 1775 /* Atomically find and remove tp from chain. */ 1776 for (pprev = &chain->filter_chain; 1777 (tp_iter = tcf_chain_dereference(*pprev, chain)); 1778 pprev = &tp_iter->next) { 1779 if (tp_iter == tp) { 1780 chain_info.pprev = pprev; 1781 chain_info.next = tp_iter->next; 1782 WARN_ON(tp_iter->deleting); 1783 break; 1784 } 1785 } 1786 /* Verify that tp still exists and no new filters were inserted 1787 * concurrently. 1788 * Mark tp for deletion if it is empty. 1789 */ 1790 if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) { 1791 mutex_unlock(&chain->filter_chain_lock); 1792 return; 1793 } 1794 1795 next = tcf_chain_dereference(chain_info.next, chain); 1796 if (tp == chain->filter_chain) 1797 tcf_chain0_head_change(chain, next); 1798 RCU_INIT_POINTER(*chain_info.pprev, next); 1799 mutex_unlock(&chain->filter_chain_lock); 1800 1801 tcf_proto_put(tp, rtnl_held, extack); 1802 } 1803 1804 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, 1805 struct tcf_chain_info *chain_info, 1806 u32 protocol, u32 prio, 1807 bool prio_allocate) 1808 { 1809 struct tcf_proto **pprev; 1810 struct tcf_proto *tp; 1811 1812 /* Check the chain for existence of proto-tcf with this priority */ 1813 for (pprev = &chain->filter_chain; 1814 (tp = tcf_chain_dereference(*pprev, chain)); 1815 pprev = &tp->next) { 1816 if (tp->prio >= prio) { 1817 if (tp->prio == prio) { 1818 if (prio_allocate || 1819 (tp->protocol != protocol && protocol)) 1820 return ERR_PTR(-EINVAL); 1821 } else { 1822 tp = NULL; 1823 } 1824 break; 1825 } 1826 } 1827 chain_info->pprev = pprev; 1828 if (tp) { 1829 chain_info->next = tp->next; 1830 tcf_proto_get(tp); 1831 } else { 1832 chain_info->next = NULL; 1833 } 1834 return tp; 1835 } 1836 1837 static int tcf_fill_node(struct net *net, struct sk_buff *skb, 1838 struct tcf_proto *tp, struct tcf_block *block, 1839 struct Qdisc *q, u32 parent, void *fh, 1840 u32 portid, u32 seq, u16 flags, int event, 1841 bool rtnl_held) 1842 { 1843 struct tcmsg *tcm; 1844 struct nlmsghdr *nlh; 1845 unsigned char *b = skb_tail_pointer(skb); 1846 1847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); 1848 if (!nlh) 1849 goto out_nlmsg_trim; 1850 tcm = nlmsg_data(nlh); 1851 tcm->tcm_family = AF_UNSPEC; 1852 tcm->tcm__pad1 = 0; 1853 tcm->tcm__pad2 = 0; 1854 if (q) { 1855 tcm->tcm_ifindex = qdisc_dev(q)->ifindex; 1856 tcm->tcm_parent = parent; 1857 } else { 1858 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; 1859 tcm->tcm_block_index = block->index; 1860 } 1861 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); 1862 if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) 1863 goto nla_put_failure; 1864 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) 1865 goto nla_put_failure; 1866 if (!fh) { 1867 tcm->tcm_handle = 0; 1868 } else { 1869 if (tp->ops->dump && 1870 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0) 1871 goto nla_put_failure; 1872 } 1873 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1874 return skb->len; 1875 1876 out_nlmsg_trim: 1877 nla_put_failure: 1878 nlmsg_trim(skb, b); 1879 return -1; 1880 } 1881 1882 static int tfilter_notify(struct net *net, struct sk_buff *oskb, 1883 struct nlmsghdr *n, struct tcf_proto *tp, 1884 struct tcf_block *block, struct Qdisc *q, 1885 u32 parent, void *fh, int event, bool unicast, 1886 bool rtnl_held) 1887 { 1888 struct sk_buff *skb; 1889 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; 1890 int err = 0; 1891 1892 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1893 if (!skb) 1894 return -ENOBUFS; 1895 1896 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, 1897 n->nlmsg_seq, n->nlmsg_flags, event, 1898 rtnl_held) <= 0) { 1899 kfree_skb(skb); 1900 return -EINVAL; 1901 } 1902 1903 if (unicast) 1904 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); 1905 else 1906 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, 1907 n->nlmsg_flags & NLM_F_ECHO); 1908 1909 if (err > 0) 1910 err = 0; 1911 return err; 1912 } 1913 1914 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, 1915 struct nlmsghdr *n, struct tcf_proto *tp, 1916 struct tcf_block *block, struct Qdisc *q, 1917 u32 parent, void *fh, bool unicast, bool *last, 1918 bool rtnl_held, struct netlink_ext_ack *extack) 1919 { 1920 struct sk_buff *skb; 1921 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; 1922 int err; 1923 1924 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1925 if (!skb) 1926 return -ENOBUFS; 1927 1928 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, 1929 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER, 1930 rtnl_held) <= 0) { 1931 NL_SET_ERR_MSG(extack, "Failed to build del event notification"); 1932 kfree_skb(skb); 1933 return -EINVAL; 1934 } 1935 1936 err = tp->ops->delete(tp, fh, last, rtnl_held, extack); 1937 if (err) { 1938 kfree_skb(skb); 1939 return err; 1940 } 1941 1942 if (unicast) 1943 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); 1944 else 1945 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, 1946 n->nlmsg_flags & NLM_F_ECHO); 1947 if (err < 0) 1948 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); 1949 1950 if (err > 0) 1951 err = 0; 1952 return err; 1953 } 1954 1955 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, 1956 struct tcf_block *block, struct Qdisc *q, 1957 u32 parent, struct nlmsghdr *n, 1958 struct tcf_chain *chain, int event, 1959 bool rtnl_held) 1960 { 1961 struct tcf_proto *tp; 1962 1963 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held); 1964 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held)) 1965 tfilter_notify(net, oskb, n, tp, block, 1966 q, parent, NULL, event, false, rtnl_held); 1967 } 1968 1969 static void tfilter_put(struct tcf_proto *tp, void *fh) 1970 { 1971 if (tp->ops->put && fh) 1972 tp->ops->put(tp, fh); 1973 } 1974 1975 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, 1976 struct netlink_ext_ack *extack) 1977 { 1978 struct net *net = sock_net(skb->sk); 1979 struct nlattr *tca[TCA_MAX + 1]; 1980 struct tcmsg *t; 1981 u32 protocol; 1982 u32 prio; 1983 bool prio_allocate; 1984 u32 parent; 1985 u32 chain_index; 1986 struct Qdisc *q = NULL; 1987 struct tcf_chain_info chain_info; 1988 struct tcf_chain *chain = NULL; 1989 struct tcf_block *block; 1990 struct tcf_proto *tp; 1991 unsigned long cl; 1992 void *fh; 1993 int err; 1994 int tp_created; 1995 bool rtnl_held = false; 1996 1997 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) 1998 return -EPERM; 1999 2000 replay: 2001 tp_created = 0; 2002 2003 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, 2004 rtm_tca_policy, extack); 2005 if (err < 0) 2006 return err; 2007 2008 t = nlmsg_data(n); 2009 protocol = TC_H_MIN(t->tcm_info); 2010 prio = TC_H_MAJ(t->tcm_info); 2011 prio_allocate = false; 2012 parent = t->tcm_parent; 2013 tp = NULL; 2014 cl = 0; 2015 block = NULL; 2016 2017 if (prio == 0) { 2018 /* If no priority is provided by the user, 2019 * we allocate one. 2020 */ 2021 if (n->nlmsg_flags & NLM_F_CREATE) { 2022 prio = TC_H_MAKE(0x80000000U, 0U); 2023 prio_allocate = true; 2024 } else { 2025 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); 2026 return -ENOENT; 2027 } 2028 } 2029 2030 /* Find head of filter chain. */ 2031 2032 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); 2033 if (err) 2034 return err; 2035 2036 /* Take rtnl mutex if rtnl_held was set to true on previous iteration, 2037 * block is shared (no qdisc found), qdisc is not unlocked, classifier 2038 * type is not specified, classifier is not unlocked. 2039 */ 2040 if (rtnl_held || 2041 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || 2042 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { 2043 rtnl_held = true; 2044 rtnl_lock(); 2045 } 2046 2047 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); 2048 if (err) 2049 goto errout; 2050 2051 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, 2052 extack); 2053 if (IS_ERR(block)) { 2054 err = PTR_ERR(block); 2055 goto errout; 2056 } 2057 2058 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; 2059 if (chain_index > TC_ACT_EXT_VAL_MASK) { 2060 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); 2061 err = -EINVAL; 2062 goto errout; 2063 } 2064 chain = tcf_chain_get(block, chain_index, true); 2065 if (!chain) { 2066 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); 2067 err = -ENOMEM; 2068 goto errout; 2069 } 2070 2071 mutex_lock(&chain->filter_chain_lock); 2072 tp = tcf_chain_tp_find(chain, &chain_info, protocol, 2073 prio, prio_allocate); 2074 if (IS_ERR(tp)) { 2075 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); 2076 err = PTR_ERR(tp); 2077 goto errout_locked; 2078 } 2079 2080 if (tp == NULL) { 2081 struct tcf_proto *tp_new = NULL; 2082 2083 if (chain->flushing) { 2084 err = -EAGAIN; 2085 goto errout_locked; 2086 } 2087 2088 /* Proto-tcf does not exist, create new one */ 2089 2090 if (tca[TCA_KIND] == NULL || !protocol) { 2091 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); 2092 err = -EINVAL; 2093 goto errout_locked; 2094 } 2095 2096 if (!(n->nlmsg_flags & NLM_F_CREATE)) { 2097 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); 2098 err = -ENOENT; 2099 goto errout_locked; 2100 } 2101 2102 if (prio_allocate) 2103 prio = tcf_auto_prio(tcf_chain_tp_prev(chain, 2104 &chain_info)); 2105 2106 mutex_unlock(&chain->filter_chain_lock); 2107 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]), 2108 protocol, prio, chain, rtnl_held, 2109 extack); 2110 if (IS_ERR(tp_new)) { 2111 err = PTR_ERR(tp_new); 2112 goto errout_tp; 2113 } 2114 2115 tp_created = 1; 2116 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio, 2117 rtnl_held); 2118 if (IS_ERR(tp)) { 2119 err = PTR_ERR(tp); 2120 goto errout_tp; 2121 } 2122 } else { 2123 mutex_unlock(&chain->filter_chain_lock); 2124 } 2125 2126 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { 2127 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); 2128 err = -EINVAL; 2129 goto errout; 2130 } 2131 2132 fh = tp->ops->get(tp, t->tcm_handle); 2133 2134 if (!fh) { 2135 if (!(n->nlmsg_flags & NLM_F_CREATE)) { 2136 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); 2137 err = -ENOENT; 2138 goto errout; 2139 } 2140 } else if (n->nlmsg_flags & NLM_F_EXCL) { 2141 tfilter_put(tp, fh); 2142 NL_SET_ERR_MSG(extack, "Filter already exists"); 2143 err = -EEXIST; 2144 goto errout; 2145 } 2146 2147 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { 2148 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); 2149 err = -EINVAL; 2150 goto errout; 2151 } 2152 2153 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, 2154 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, 2155 rtnl_held, extack); 2156 if (err == 0) { 2157 tfilter_notify(net, skb, n, tp, block, q, parent, fh, 2158 RTM_NEWTFILTER, false, rtnl_held); 2159 tfilter_put(tp, fh); 2160 /* q pointer is NULL for shared blocks */ 2161 if (q) 2162 q->flags &= ~TCQ_F_CAN_BYPASS; 2163 } 2164 2165 errout: 2166 if (err && tp_created) 2167 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL); 2168 errout_tp: 2169 if (chain) { 2170 if (tp && !IS_ERR(tp)) 2171 tcf_proto_put(tp, rtnl_held, NULL); 2172 if (!tp_created) 2173 tcf_chain_put(chain); 2174 } 2175 tcf_block_release(q, block, rtnl_held); 2176 2177 if (rtnl_held) 2178 rtnl_unlock(); 2179 2180 if (err == -EAGAIN) { 2181 /* Take rtnl lock in case EAGAIN is caused by concurrent flush 2182 * of target chain. 2183 */ 2184 rtnl_held = true; 2185 /* Replay the request. */ 2186 goto replay; 2187 } 2188 return err; 2189 2190 errout_locked: 2191 mutex_unlock(&chain->filter_chain_lock); 2192 goto errout; 2193 } 2194 2195 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, 2196 struct netlink_ext_ack *extack) 2197 { 2198 struct net *net = sock_net(skb->sk); 2199 struct nlattr *tca[TCA_MAX + 1]; 2200 struct tcmsg *t; 2201 u32 protocol; 2202 u32 prio; 2203 u32 parent; 2204 u32 chain_index; 2205 struct Qdisc *q = NULL; 2206 struct tcf_chain_info chain_info; 2207 struct tcf_chain *chain = NULL; 2208 struct tcf_block *block = NULL; 2209 struct tcf_proto *tp = NULL; 2210 unsigned long cl = 0; 2211 void *fh = NULL; 2212 int err; 2213 bool rtnl_held = false; 2214 2215 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) 2216 return -EPERM; 2217 2218 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, 2219 rtm_tca_policy, extack); 2220 if (err < 0) 2221 return err; 2222 2223 t = nlmsg_data(n); 2224 protocol = TC_H_MIN(t->tcm_info); 2225 prio = TC_H_MAJ(t->tcm_info); 2226 parent = t->tcm_parent; 2227 2228 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { 2229 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); 2230 return -ENOENT; 2231 } 2232 2233 /* Find head of filter chain. */ 2234 2235 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); 2236 if (err) 2237 return err; 2238 2239 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc 2240 * found), qdisc is not unlocked, classifier type is not specified, 2241 * classifier is not unlocked. 2242 */ 2243 if (!prio || 2244 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || 2245 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { 2246 rtnl_held = true; 2247 rtnl_lock(); 2248 } 2249 2250 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); 2251 if (err) 2252 goto errout; 2253 2254 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, 2255 extack); 2256 if (IS_ERR(block)) { 2257 err = PTR_ERR(block); 2258 goto errout; 2259 } 2260 2261 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; 2262 if (chain_index > TC_ACT_EXT_VAL_MASK) { 2263 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); 2264 err = -EINVAL; 2265 goto errout; 2266 } 2267 chain = tcf_chain_get(block, chain_index, false); 2268 if (!chain) { 2269 /* User requested flush on non-existent chain. Nothing to do, 2270 * so just return success. 2271 */ 2272 if (prio == 0) { 2273 err = 0; 2274 goto errout; 2275 } 2276 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); 2277 err = -ENOENT; 2278 goto errout; 2279 } 2280 2281 if (prio == 0) { 2282 tfilter_notify_chain(net, skb, block, q, parent, n, 2283 chain, RTM_DELTFILTER, rtnl_held); 2284 tcf_chain_flush(chain, rtnl_held); 2285 err = 0; 2286 goto errout; 2287 } 2288 2289 mutex_lock(&chain->filter_chain_lock); 2290 tp = tcf_chain_tp_find(chain, &chain_info, protocol, 2291 prio, false); 2292 if (!tp || IS_ERR(tp)) { 2293 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); 2294 err = tp ? PTR_ERR(tp) : -ENOENT; 2295 goto errout_locked; 2296 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { 2297 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); 2298 err = -EINVAL; 2299 goto errout_locked; 2300 } else if (t->tcm_handle == 0) { 2301 tcf_chain_tp_remove(chain, &chain_info, tp); 2302 mutex_unlock(&chain->filter_chain_lock); 2303 2304 tcf_proto_put(tp, rtnl_held, NULL); 2305 tfilter_notify(net, skb, n, tp, block, q, parent, fh, 2306 RTM_DELTFILTER, false, rtnl_held); 2307 err = 0; 2308 goto errout; 2309 } 2310 mutex_unlock(&chain->filter_chain_lock); 2311 2312 fh = tp->ops->get(tp, t->tcm_handle); 2313 2314 if (!fh) { 2315 NL_SET_ERR_MSG(extack, "Specified filter handle not found"); 2316 err = -ENOENT; 2317 } else { 2318 bool last; 2319 2320 err = tfilter_del_notify(net, skb, n, tp, block, 2321 q, parent, fh, false, &last, 2322 rtnl_held, extack); 2323 2324 if (err) 2325 goto errout; 2326 if (last) 2327 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack); 2328 } 2329 2330 errout: 2331 if (chain) { 2332 if (tp && !IS_ERR(tp)) 2333 tcf_proto_put(tp, rtnl_held, NULL); 2334 tcf_chain_put(chain); 2335 } 2336 tcf_block_release(q, block, rtnl_held); 2337 2338 if (rtnl_held) 2339 rtnl_unlock(); 2340 2341 return err; 2342 2343 errout_locked: 2344 mutex_unlock(&chain->filter_chain_lock); 2345 goto errout; 2346 } 2347 2348 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, 2349 struct netlink_ext_ack *extack) 2350 { 2351 struct net *net = sock_net(skb->sk); 2352 struct nlattr *tca[TCA_MAX + 1]; 2353 struct tcmsg *t; 2354 u32 protocol; 2355 u32 prio; 2356 u32 parent; 2357 u32 chain_index; 2358 struct Qdisc *q = NULL; 2359 struct tcf_chain_info chain_info; 2360 struct tcf_chain *chain = NULL; 2361 struct tcf_block *block = NULL; 2362 struct tcf_proto *tp = NULL; 2363 unsigned long cl = 0; 2364 void *fh = NULL; 2365 int err; 2366 bool rtnl_held = false; 2367 2368 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, 2369 rtm_tca_policy, extack); 2370 if (err < 0) 2371 return err; 2372 2373 t = nlmsg_data(n); 2374 protocol = TC_H_MIN(t->tcm_info); 2375 prio = TC_H_MAJ(t->tcm_info); 2376 parent = t->tcm_parent; 2377 2378 if (prio == 0) { 2379 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); 2380 return -ENOENT; 2381 } 2382 2383 /* Find head of filter chain. */ 2384 2385 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); 2386 if (err) 2387 return err; 2388 2389 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not 2390 * unlocked, classifier type is not specified, classifier is not 2391 * unlocked. 2392 */ 2393 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || 2394 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { 2395 rtnl_held = true; 2396 rtnl_lock(); 2397 } 2398 2399 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); 2400 if (err) 2401 goto errout; 2402 2403 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, 2404 extack); 2405 if (IS_ERR(block)) { 2406 err = PTR_ERR(block); 2407 goto errout; 2408 } 2409 2410 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; 2411 if (chain_index > TC_ACT_EXT_VAL_MASK) { 2412 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); 2413 err = -EINVAL; 2414 goto errout; 2415 } 2416 chain = tcf_chain_get(block, chain_index, false); 2417 if (!chain) { 2418 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); 2419 err = -EINVAL; 2420 goto errout; 2421 } 2422 2423 mutex_lock(&chain->filter_chain_lock); 2424 tp = tcf_chain_tp_find(chain, &chain_info, protocol, 2425 prio, false); 2426 mutex_unlock(&chain->filter_chain_lock); 2427 if (!tp || IS_ERR(tp)) { 2428 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); 2429 err = tp ? PTR_ERR(tp) : -ENOENT; 2430 goto errout; 2431 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { 2432 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); 2433 err = -EINVAL; 2434 goto errout; 2435 } 2436 2437 fh = tp->ops->get(tp, t->tcm_handle); 2438 2439 if (!fh) { 2440 NL_SET_ERR_MSG(extack, "Specified filter handle not found"); 2441 err = -ENOENT; 2442 } else { 2443 err = tfilter_notify(net, skb, n, tp, block, q, parent, 2444 fh, RTM_NEWTFILTER, true, rtnl_held); 2445 if (err < 0) 2446 NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); 2447 } 2448 2449 tfilter_put(tp, fh); 2450 errout: 2451 if (chain) { 2452 if (tp && !IS_ERR(tp)) 2453 tcf_proto_put(tp, rtnl_held, NULL); 2454 tcf_chain_put(chain); 2455 } 2456 tcf_block_release(q, block, rtnl_held); 2457 2458 if (rtnl_held) 2459 rtnl_unlock(); 2460 2461 return err; 2462 } 2463 2464 struct tcf_dump_args { 2465 struct tcf_walker w; 2466 struct sk_buff *skb; 2467 struct netlink_callback *cb; 2468 struct tcf_block *block; 2469 struct Qdisc *q; 2470 u32 parent; 2471 }; 2472 2473 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) 2474 { 2475 struct tcf_dump_args *a = (void *)arg; 2476 struct net *net = sock_net(a->skb->sk); 2477 2478 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, 2479 n, NETLINK_CB(a->cb->skb).portid, 2480 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, 2481 RTM_NEWTFILTER, true); 2482 } 2483 2484 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, 2485 struct sk_buff *skb, struct netlink_callback *cb, 2486 long index_start, long *p_index) 2487 { 2488 struct net *net = sock_net(skb->sk); 2489 struct tcf_block *block = chain->block; 2490 struct tcmsg *tcm = nlmsg_data(cb->nlh); 2491 struct tcf_proto *tp, *tp_prev; 2492 struct tcf_dump_args arg; 2493 2494 for (tp = __tcf_get_next_proto(chain, NULL); 2495 tp; 2496 tp_prev = tp, 2497 tp = __tcf_get_next_proto(chain, tp), 2498 tcf_proto_put(tp_prev, true, NULL), 2499 (*p_index)++) { 2500 if (*p_index < index_start) 2501 continue; 2502 if (TC_H_MAJ(tcm->tcm_info) && 2503 TC_H_MAJ(tcm->tcm_info) != tp->prio) 2504 continue; 2505 if (TC_H_MIN(tcm->tcm_info) && 2506 TC_H_MIN(tcm->tcm_info) != tp->protocol) 2507 continue; 2508 if (*p_index > index_start) 2509 memset(&cb->args[1], 0, 2510 sizeof(cb->args) - sizeof(cb->args[0])); 2511 if (cb->args[1] == 0) { 2512 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, 2513 NETLINK_CB(cb->skb).portid, 2514 cb->nlh->nlmsg_seq, NLM_F_MULTI, 2515 RTM_NEWTFILTER, true) <= 0) 2516 goto errout; 2517 cb->args[1] = 1; 2518 } 2519 if (!tp->ops->walk) 2520 continue; 2521 arg.w.fn = tcf_node_dump; 2522 arg.skb = skb; 2523 arg.cb = cb; 2524 arg.block = block; 2525 arg.q = q; 2526 arg.parent = parent; 2527 arg.w.stop = 0; 2528 arg.w.skip = cb->args[1] - 1; 2529 arg.w.count = 0; 2530 arg.w.cookie = cb->args[2]; 2531 tp->ops->walk(tp, &arg.w, true); 2532 cb->args[2] = arg.w.cookie; 2533 cb->args[1] = arg.w.count + 1; 2534 if (arg.w.stop) 2535 goto errout; 2536 } 2537 return true; 2538 2539 errout: 2540 tcf_proto_put(tp, true, NULL); 2541 return false; 2542 } 2543 2544 /* called with RTNL */ 2545 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) 2546 { 2547 struct tcf_chain *chain, *chain_prev; 2548 struct net *net = sock_net(skb->sk); 2549 struct nlattr *tca[TCA_MAX + 1]; 2550 struct Qdisc *q = NULL; 2551 struct tcf_block *block; 2552 struct tcmsg *tcm = nlmsg_data(cb->nlh); 2553 long index_start; 2554 long index; 2555 u32 parent; 2556 int err; 2557 2558 if (nlmsg_len(cb->nlh) < sizeof(*tcm)) 2559 return skb->len; 2560 2561 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, 2562 NULL, cb->extack); 2563 if (err) 2564 return err; 2565 2566 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { 2567 block = tcf_block_refcnt_get(net, tcm->tcm_block_index); 2568 if (!block) 2569 goto out; 2570 /* If we work with block index, q is NULL and parent value 2571 * will never be used in the following code. The check 2572 * in tcf_fill_node prevents it. However, compiler does not 2573 * see that far, so set parent to zero to silence the warning 2574 * about parent being uninitialized. 2575 */ 2576 parent = 0; 2577 } else { 2578 const struct Qdisc_class_ops *cops; 2579 struct net_device *dev; 2580 unsigned long cl = 0; 2581 2582 dev = __dev_get_by_index(net, tcm->tcm_ifindex); 2583 if (!dev) 2584 return skb->len; 2585 2586 parent = tcm->tcm_parent; 2587 if (!parent) { 2588 q = dev->qdisc; 2589 parent = q->handle; 2590 } else { 2591 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); 2592 } 2593 if (!q) 2594 goto out; 2595 cops = q->ops->cl_ops; 2596 if (!cops) 2597 goto out; 2598 if (!cops->tcf_block) 2599 goto out; 2600 if (TC_H_MIN(tcm->tcm_parent)) { 2601 cl = cops->find(q, tcm->tcm_parent); 2602 if (cl == 0) 2603 goto out; 2604 } 2605 block = cops->tcf_block(q, cl, NULL); 2606 if (!block) 2607 goto out; 2608 if (tcf_block_shared(block)) 2609 q = NULL; 2610 } 2611 2612 index_start = cb->args[0]; 2613 index = 0; 2614 2615 for (chain = __tcf_get_next_chain(block, NULL); 2616 chain; 2617 chain_prev = chain, 2618 chain = __tcf_get_next_chain(block, chain), 2619 tcf_chain_put(chain_prev)) { 2620 if (tca[TCA_CHAIN] && 2621 nla_get_u32(tca[TCA_CHAIN]) != chain->index) 2622 continue; 2623 if (!tcf_chain_dump(chain, q, parent, skb, cb, 2624 index_start, &index)) { 2625 tcf_chain_put(chain); 2626 err = -EMSGSIZE; 2627 break; 2628 } 2629 } 2630 2631 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) 2632 tcf_block_refcnt_put(block, true); 2633 cb->args[0] = index; 2634 2635 out: 2636 /* If we did no progress, the error (EMSGSIZE) is real */ 2637 if (skb->len == 0 && err) 2638 return err; 2639 return skb->len; 2640 } 2641 2642 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, 2643 void *tmplt_priv, u32 chain_index, 2644 struct net *net, struct sk_buff *skb, 2645 struct tcf_block *block, 2646 u32 portid, u32 seq, u16 flags, int event) 2647 { 2648 unsigned char *b = skb_tail_pointer(skb); 2649 const struct tcf_proto_ops *ops; 2650 struct nlmsghdr *nlh; 2651 struct tcmsg *tcm; 2652 void *priv; 2653 2654 ops = tmplt_ops; 2655 priv = tmplt_priv; 2656 2657 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); 2658 if (!nlh) 2659 goto out_nlmsg_trim; 2660 tcm = nlmsg_data(nlh); 2661 tcm->tcm_family = AF_UNSPEC; 2662 tcm->tcm__pad1 = 0; 2663 tcm->tcm__pad2 = 0; 2664 tcm->tcm_handle = 0; 2665 if (block->q) { 2666 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; 2667 tcm->tcm_parent = block->q->handle; 2668 } else { 2669 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; 2670 tcm->tcm_block_index = block->index; 2671 } 2672 2673 if (nla_put_u32(skb, TCA_CHAIN, chain_index)) 2674 goto nla_put_failure; 2675 2676 if (ops) { 2677 if (nla_put_string(skb, TCA_KIND, ops->kind)) 2678 goto nla_put_failure; 2679 if (ops->tmplt_dump(skb, net, priv) < 0) 2680 goto nla_put_failure; 2681 } 2682 2683 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2684 return skb->len; 2685 2686 out_nlmsg_trim: 2687 nla_put_failure: 2688 nlmsg_trim(skb, b); 2689 return -EMSGSIZE; 2690 } 2691 2692 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, 2693 u32 seq, u16 flags, int event, bool unicast) 2694 { 2695 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; 2696 struct tcf_block *block = chain->block; 2697 struct net *net = block->net; 2698 struct sk_buff *skb; 2699 int err = 0; 2700 2701 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2702 if (!skb) 2703 return -ENOBUFS; 2704 2705 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, 2706 chain->index, net, skb, block, portid, 2707 seq, flags, event) <= 0) { 2708 kfree_skb(skb); 2709 return -EINVAL; 2710 } 2711 2712 if (unicast) 2713 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); 2714 else 2715 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, 2716 flags & NLM_F_ECHO); 2717 2718 if (err > 0) 2719 err = 0; 2720 return err; 2721 } 2722 2723 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, 2724 void *tmplt_priv, u32 chain_index, 2725 struct tcf_block *block, struct sk_buff *oskb, 2726 u32 seq, u16 flags, bool unicast) 2727 { 2728 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; 2729 struct net *net = block->net; 2730 struct sk_buff *skb; 2731 2732 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2733 if (!skb) 2734 return -ENOBUFS; 2735 2736 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb, 2737 block, portid, seq, flags, RTM_DELCHAIN) <= 0) { 2738 kfree_skb(skb); 2739 return -EINVAL; 2740 } 2741 2742 if (unicast) 2743 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); 2744 2745 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); 2746 } 2747 2748 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, 2749 struct nlattr **tca, 2750 struct netlink_ext_ack *extack) 2751 { 2752 const struct tcf_proto_ops *ops; 2753 void *tmplt_priv; 2754 2755 /* If kind is not set, user did not specify template. */ 2756 if (!tca[TCA_KIND]) 2757 return 0; 2758 2759 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack); 2760 if (IS_ERR(ops)) 2761 return PTR_ERR(ops); 2762 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { 2763 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); 2764 return -EOPNOTSUPP; 2765 } 2766 2767 tmplt_priv = ops->tmplt_create(net, chain, tca, extack); 2768 if (IS_ERR(tmplt_priv)) { 2769 module_put(ops->owner); 2770 return PTR_ERR(tmplt_priv); 2771 } 2772 chain->tmplt_ops = ops; 2773 chain->tmplt_priv = tmplt_priv; 2774 return 0; 2775 } 2776 2777 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, 2778 void *tmplt_priv) 2779 { 2780 /* If template ops are set, no work to do for us. */ 2781 if (!tmplt_ops) 2782 return; 2783 2784 tmplt_ops->tmplt_destroy(tmplt_priv); 2785 module_put(tmplt_ops->owner); 2786 } 2787 2788 /* Add/delete/get a chain */ 2789 2790 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, 2791 struct netlink_ext_ack *extack) 2792 { 2793 struct net *net = sock_net(skb->sk); 2794 struct nlattr *tca[TCA_MAX + 1]; 2795 struct tcmsg *t; 2796 u32 parent; 2797 u32 chain_index; 2798 struct Qdisc *q = NULL; 2799 struct tcf_chain *chain = NULL; 2800 struct tcf_block *block; 2801 unsigned long cl; 2802 int err; 2803 2804 if (n->nlmsg_type != RTM_GETCHAIN && 2805 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) 2806 return -EPERM; 2807 2808 replay: 2809 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, 2810 rtm_tca_policy, extack); 2811 if (err < 0) 2812 return err; 2813 2814 t = nlmsg_data(n); 2815 parent = t->tcm_parent; 2816 cl = 0; 2817 2818 block = tcf_block_find(net, &q, &parent, &cl, 2819 t->tcm_ifindex, t->tcm_block_index, extack); 2820 if (IS_ERR(block)) 2821 return PTR_ERR(block); 2822 2823 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; 2824 if (chain_index > TC_ACT_EXT_VAL_MASK) { 2825 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); 2826 err = -EINVAL; 2827 goto errout_block; 2828 } 2829 2830 mutex_lock(&block->lock); 2831 chain = tcf_chain_lookup(block, chain_index); 2832 if (n->nlmsg_type == RTM_NEWCHAIN) { 2833 if (chain) { 2834 if (tcf_chain_held_by_acts_only(chain)) { 2835 /* The chain exists only because there is 2836 * some action referencing it. 2837 */ 2838 tcf_chain_hold(chain); 2839 } else { 2840 NL_SET_ERR_MSG(extack, "Filter chain already exists"); 2841 err = -EEXIST; 2842 goto errout_block_locked; 2843 } 2844 } else { 2845 if (!(n->nlmsg_flags & NLM_F_CREATE)) { 2846 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); 2847 err = -ENOENT; 2848 goto errout_block_locked; 2849 } 2850 chain = tcf_chain_create(block, chain_index); 2851 if (!chain) { 2852 NL_SET_ERR_MSG(extack, "Failed to create filter chain"); 2853 err = -ENOMEM; 2854 goto errout_block_locked; 2855 } 2856 } 2857 } else { 2858 if (!chain || tcf_chain_held_by_acts_only(chain)) { 2859 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); 2860 err = -EINVAL; 2861 goto errout_block_locked; 2862 } 2863 tcf_chain_hold(chain); 2864 } 2865 2866 if (n->nlmsg_type == RTM_NEWCHAIN) { 2867 /* Modifying chain requires holding parent block lock. In case 2868 * the chain was successfully added, take a reference to the 2869 * chain. This ensures that an empty chain does not disappear at 2870 * the end of this function. 2871 */ 2872 tcf_chain_hold(chain); 2873 chain->explicitly_created = true; 2874 } 2875 mutex_unlock(&block->lock); 2876 2877 switch (n->nlmsg_type) { 2878 case RTM_NEWCHAIN: 2879 err = tc_chain_tmplt_add(chain, net, tca, extack); 2880 if (err) { 2881 tcf_chain_put_explicitly_created(chain); 2882 goto errout; 2883 } 2884 2885 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, 2886 RTM_NEWCHAIN, false); 2887 break; 2888 case RTM_DELCHAIN: 2889 tfilter_notify_chain(net, skb, block, q, parent, n, 2890 chain, RTM_DELTFILTER, true); 2891 /* Flush the chain first as the user requested chain removal. */ 2892 tcf_chain_flush(chain, true); 2893 /* In case the chain was successfully deleted, put a reference 2894 * to the chain previously taken during addition. 2895 */ 2896 tcf_chain_put_explicitly_created(chain); 2897 break; 2898 case RTM_GETCHAIN: 2899 err = tc_chain_notify(chain, skb, n->nlmsg_seq, 2900 n->nlmsg_seq, n->nlmsg_type, true); 2901 if (err < 0) 2902 NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); 2903 break; 2904 default: 2905 err = -EOPNOTSUPP; 2906 NL_SET_ERR_MSG(extack, "Unsupported message type"); 2907 goto errout; 2908 } 2909 2910 errout: 2911 tcf_chain_put(chain); 2912 errout_block: 2913 tcf_block_release(q, block, true); 2914 if (err == -EAGAIN) 2915 /* Replay the request. */ 2916 goto replay; 2917 return err; 2918 2919 errout_block_locked: 2920 mutex_unlock(&block->lock); 2921 goto errout_block; 2922 } 2923 2924 /* called with RTNL */ 2925 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) 2926 { 2927 struct net *net = sock_net(skb->sk); 2928 struct nlattr *tca[TCA_MAX + 1]; 2929 struct Qdisc *q = NULL; 2930 struct tcf_block *block; 2931 struct tcmsg *tcm = nlmsg_data(cb->nlh); 2932 struct tcf_chain *chain; 2933 long index_start; 2934 long index; 2935 u32 parent; 2936 int err; 2937 2938 if (nlmsg_len(cb->nlh) < sizeof(*tcm)) 2939 return skb->len; 2940 2941 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, 2942 rtm_tca_policy, cb->extack); 2943 if (err) 2944 return err; 2945 2946 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { 2947 block = tcf_block_refcnt_get(net, tcm->tcm_block_index); 2948 if (!block) 2949 goto out; 2950 /* If we work with block index, q is NULL and parent value 2951 * will never be used in the following code. The check 2952 * in tcf_fill_node prevents it. However, compiler does not 2953 * see that far, so set parent to zero to silence the warning 2954 * about parent being uninitialized. 2955 */ 2956 parent = 0; 2957 } else { 2958 const struct Qdisc_class_ops *cops; 2959 struct net_device *dev; 2960 unsigned long cl = 0; 2961 2962 dev = __dev_get_by_index(net, tcm->tcm_ifindex); 2963 if (!dev) 2964 return skb->len; 2965 2966 parent = tcm->tcm_parent; 2967 if (!parent) { 2968 q = dev->qdisc; 2969 parent = q->handle; 2970 } else { 2971 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); 2972 } 2973 if (!q) 2974 goto out; 2975 cops = q->ops->cl_ops; 2976 if (!cops) 2977 goto out; 2978 if (!cops->tcf_block) 2979 goto out; 2980 if (TC_H_MIN(tcm->tcm_parent)) { 2981 cl = cops->find(q, tcm->tcm_parent); 2982 if (cl == 0) 2983 goto out; 2984 } 2985 block = cops->tcf_block(q, cl, NULL); 2986 if (!block) 2987 goto out; 2988 if (tcf_block_shared(block)) 2989 q = NULL; 2990 } 2991 2992 index_start = cb->args[0]; 2993 index = 0; 2994 2995 mutex_lock(&block->lock); 2996 list_for_each_entry(chain, &block->chain_list, list) { 2997 if ((tca[TCA_CHAIN] && 2998 nla_get_u32(tca[TCA_CHAIN]) != chain->index)) 2999 continue; 3000 if (index < index_start) { 3001 index++; 3002 continue; 3003 } 3004 if (tcf_chain_held_by_acts_only(chain)) 3005 continue; 3006 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, 3007 chain->index, net, skb, block, 3008 NETLINK_CB(cb->skb).portid, 3009 cb->nlh->nlmsg_seq, NLM_F_MULTI, 3010 RTM_NEWCHAIN); 3011 if (err <= 0) 3012 break; 3013 index++; 3014 } 3015 mutex_unlock(&block->lock); 3016 3017 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) 3018 tcf_block_refcnt_put(block, true); 3019 cb->args[0] = index; 3020 3021 out: 3022 /* If we did no progress, the error (EMSGSIZE) is real */ 3023 if (skb->len == 0 && err) 3024 return err; 3025 return skb->len; 3026 } 3027 3028 void tcf_exts_destroy(struct tcf_exts *exts) 3029 { 3030 #ifdef CONFIG_NET_CLS_ACT 3031 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); 3032 kfree(exts->actions); 3033 exts->nr_actions = 0; 3034 #endif 3035 } 3036 EXPORT_SYMBOL(tcf_exts_destroy); 3037 3038 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, 3039 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, 3040 bool rtnl_held, struct netlink_ext_ack *extack) 3041 { 3042 #ifdef CONFIG_NET_CLS_ACT 3043 { 3044 struct tc_action *act; 3045 size_t attr_size = 0; 3046 3047 if (exts->police && tb[exts->police]) { 3048 act = tcf_action_init_1(net, tp, tb[exts->police], 3049 rate_tlv, "police", ovr, 3050 TCA_ACT_BIND, rtnl_held, 3051 extack); 3052 if (IS_ERR(act)) 3053 return PTR_ERR(act); 3054 3055 act->type = exts->type = TCA_OLD_COMPAT; 3056 exts->actions[0] = act; 3057 exts->nr_actions = 1; 3058 } else if (exts->action && tb[exts->action]) { 3059 int err; 3060 3061 err = tcf_action_init(net, tp, tb[exts->action], 3062 rate_tlv, NULL, ovr, TCA_ACT_BIND, 3063 exts->actions, &attr_size, 3064 rtnl_held, extack); 3065 if (err < 0) 3066 return err; 3067 exts->nr_actions = err; 3068 } 3069 } 3070 #else 3071 if ((exts->action && tb[exts->action]) || 3072 (exts->police && tb[exts->police])) { 3073 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); 3074 return -EOPNOTSUPP; 3075 } 3076 #endif 3077 3078 return 0; 3079 } 3080 EXPORT_SYMBOL(tcf_exts_validate); 3081 3082 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) 3083 { 3084 #ifdef CONFIG_NET_CLS_ACT 3085 struct tcf_exts old = *dst; 3086 3087 *dst = *src; 3088 tcf_exts_destroy(&old); 3089 #endif 3090 } 3091 EXPORT_SYMBOL(tcf_exts_change); 3092 3093 #ifdef CONFIG_NET_CLS_ACT 3094 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) 3095 { 3096 if (exts->nr_actions == 0) 3097 return NULL; 3098 else 3099 return exts->actions[0]; 3100 } 3101 #endif 3102 3103 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) 3104 { 3105 #ifdef CONFIG_NET_CLS_ACT 3106 struct nlattr *nest; 3107 3108 if (exts->action && tcf_exts_has_actions(exts)) { 3109 /* 3110 * again for backward compatible mode - we want 3111 * to work with both old and new modes of entering 3112 * tc data even if iproute2 was newer - jhs 3113 */ 3114 if (exts->type != TCA_OLD_COMPAT) { 3115 nest = nla_nest_start_noflag(skb, exts->action); 3116 if (nest == NULL) 3117 goto nla_put_failure; 3118 3119 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) 3120 goto nla_put_failure; 3121 nla_nest_end(skb, nest); 3122 } else if (exts->police) { 3123 struct tc_action *act = tcf_exts_first_act(exts); 3124 nest = nla_nest_start_noflag(skb, exts->police); 3125 if (nest == NULL || !act) 3126 goto nla_put_failure; 3127 if (tcf_action_dump_old(skb, act, 0, 0) < 0) 3128 goto nla_put_failure; 3129 nla_nest_end(skb, nest); 3130 } 3131 } 3132 return 0; 3133 3134 nla_put_failure: 3135 nla_nest_cancel(skb, nest); 3136 return -1; 3137 #else 3138 return 0; 3139 #endif 3140 } 3141 EXPORT_SYMBOL(tcf_exts_dump); 3142 3143 3144 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) 3145 { 3146 #ifdef CONFIG_NET_CLS_ACT 3147 struct tc_action *a = tcf_exts_first_act(exts); 3148 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) 3149 return -1; 3150 #endif 3151 return 0; 3152 } 3153 EXPORT_SYMBOL(tcf_exts_dump_stats); 3154 3155 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, 3156 void *type_data, bool err_stop) 3157 { 3158 struct flow_block_cb *block_cb; 3159 int ok_count = 0; 3160 int err; 3161 3162 /* Make sure all netdevs sharing this block are offload-capable. */ 3163 if (block->nooffloaddevcnt && err_stop) 3164 return -EOPNOTSUPP; 3165 3166 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) { 3167 err = block_cb->cb(type, type_data, block_cb->cb_priv); 3168 if (err) { 3169 if (err_stop) 3170 return err; 3171 } else { 3172 ok_count++; 3173 } 3174 } 3175 return ok_count; 3176 } 3177 EXPORT_SYMBOL(tc_setup_cb_call); 3178 3179 int tc_setup_flow_action(struct flow_action *flow_action, 3180 const struct tcf_exts *exts) 3181 { 3182 const struct tc_action *act; 3183 int i, j, k; 3184 3185 if (!exts) 3186 return 0; 3187 3188 j = 0; 3189 tcf_exts_for_each_action(i, act, exts) { 3190 struct flow_action_entry *entry; 3191 3192 entry = &flow_action->entries[j]; 3193 if (is_tcf_gact_ok(act)) { 3194 entry->id = FLOW_ACTION_ACCEPT; 3195 } else if (is_tcf_gact_shot(act)) { 3196 entry->id = FLOW_ACTION_DROP; 3197 } else if (is_tcf_gact_trap(act)) { 3198 entry->id = FLOW_ACTION_TRAP; 3199 } else if (is_tcf_gact_goto_chain(act)) { 3200 entry->id = FLOW_ACTION_GOTO; 3201 entry->chain_index = tcf_gact_goto_chain_index(act); 3202 } else if (is_tcf_mirred_egress_redirect(act)) { 3203 entry->id = FLOW_ACTION_REDIRECT; 3204 entry->dev = tcf_mirred_dev(act); 3205 } else if (is_tcf_mirred_egress_mirror(act)) { 3206 entry->id = FLOW_ACTION_MIRRED; 3207 entry->dev = tcf_mirred_dev(act); 3208 } else if (is_tcf_vlan(act)) { 3209 switch (tcf_vlan_action(act)) { 3210 case TCA_VLAN_ACT_PUSH: 3211 entry->id = FLOW_ACTION_VLAN_PUSH; 3212 entry->vlan.vid = tcf_vlan_push_vid(act); 3213 entry->vlan.proto = tcf_vlan_push_proto(act); 3214 entry->vlan.prio = tcf_vlan_push_prio(act); 3215 break; 3216 case TCA_VLAN_ACT_POP: 3217 entry->id = FLOW_ACTION_VLAN_POP; 3218 break; 3219 case TCA_VLAN_ACT_MODIFY: 3220 entry->id = FLOW_ACTION_VLAN_MANGLE; 3221 entry->vlan.vid = tcf_vlan_push_vid(act); 3222 entry->vlan.proto = tcf_vlan_push_proto(act); 3223 entry->vlan.prio = tcf_vlan_push_prio(act); 3224 break; 3225 default: 3226 goto err_out; 3227 } 3228 } else if (is_tcf_tunnel_set(act)) { 3229 entry->id = FLOW_ACTION_TUNNEL_ENCAP; 3230 entry->tunnel = tcf_tunnel_info(act); 3231 } else if (is_tcf_tunnel_release(act)) { 3232 entry->id = FLOW_ACTION_TUNNEL_DECAP; 3233 } else if (is_tcf_pedit(act)) { 3234 for (k = 0; k < tcf_pedit_nkeys(act); k++) { 3235 switch (tcf_pedit_cmd(act, k)) { 3236 case TCA_PEDIT_KEY_EX_CMD_SET: 3237 entry->id = FLOW_ACTION_MANGLE; 3238 break; 3239 case TCA_PEDIT_KEY_EX_CMD_ADD: 3240 entry->id = FLOW_ACTION_ADD; 3241 break; 3242 default: 3243 goto err_out; 3244 } 3245 entry->mangle.htype = tcf_pedit_htype(act, k); 3246 entry->mangle.mask = tcf_pedit_mask(act, k); 3247 entry->mangle.val = tcf_pedit_val(act, k); 3248 entry->mangle.offset = tcf_pedit_offset(act, k); 3249 entry = &flow_action->entries[++j]; 3250 } 3251 } else if (is_tcf_csum(act)) { 3252 entry->id = FLOW_ACTION_CSUM; 3253 entry->csum_flags = tcf_csum_update_flags(act); 3254 } else if (is_tcf_skbedit_mark(act)) { 3255 entry->id = FLOW_ACTION_MARK; 3256 entry->mark = tcf_skbedit_mark(act); 3257 } else if (is_tcf_sample(act)) { 3258 entry->id = FLOW_ACTION_SAMPLE; 3259 entry->sample.psample_group = 3260 tcf_sample_psample_group(act); 3261 entry->sample.trunc_size = tcf_sample_trunc_size(act); 3262 entry->sample.truncate = tcf_sample_truncate(act); 3263 entry->sample.rate = tcf_sample_rate(act); 3264 } else if (is_tcf_police(act)) { 3265 entry->id = FLOW_ACTION_POLICE; 3266 entry->police.burst = tcf_police_tcfp_burst(act); 3267 entry->police.rate_bytes_ps = 3268 tcf_police_rate_bytes_ps(act); 3269 } else if (is_tcf_ct(act)) { 3270 entry->id = FLOW_ACTION_CT; 3271 entry->ct.action = tcf_ct_action(act); 3272 entry->ct.zone = tcf_ct_zone(act); 3273 } else if (is_tcf_mpls(act)) { 3274 switch (tcf_mpls_action(act)) { 3275 case TCA_MPLS_ACT_PUSH: 3276 entry->id = FLOW_ACTION_MPLS_PUSH; 3277 entry->mpls_push.proto = tcf_mpls_proto(act); 3278 entry->mpls_push.label = tcf_mpls_label(act); 3279 entry->mpls_push.tc = tcf_mpls_tc(act); 3280 entry->mpls_push.bos = tcf_mpls_bos(act); 3281 entry->mpls_push.ttl = tcf_mpls_ttl(act); 3282 break; 3283 case TCA_MPLS_ACT_POP: 3284 entry->id = FLOW_ACTION_MPLS_POP; 3285 entry->mpls_pop.proto = tcf_mpls_proto(act); 3286 break; 3287 case TCA_MPLS_ACT_MODIFY: 3288 entry->id = FLOW_ACTION_MPLS_MANGLE; 3289 entry->mpls_mangle.label = tcf_mpls_label(act); 3290 entry->mpls_mangle.tc = tcf_mpls_tc(act); 3291 entry->mpls_mangle.bos = tcf_mpls_bos(act); 3292 entry->mpls_mangle.ttl = tcf_mpls_ttl(act); 3293 break; 3294 default: 3295 goto err_out; 3296 } 3297 } else { 3298 goto err_out; 3299 } 3300 3301 if (!is_tcf_pedit(act)) 3302 j++; 3303 } 3304 return 0; 3305 err_out: 3306 return -EOPNOTSUPP; 3307 } 3308 EXPORT_SYMBOL(tc_setup_flow_action); 3309 3310 unsigned int tcf_exts_num_actions(struct tcf_exts *exts) 3311 { 3312 unsigned int num_acts = 0; 3313 struct tc_action *act; 3314 int i; 3315 3316 tcf_exts_for_each_action(i, act, exts) { 3317 if (is_tcf_pedit(act)) 3318 num_acts += tcf_pedit_nkeys(act); 3319 else 3320 num_acts++; 3321 } 3322 return num_acts; 3323 } 3324 EXPORT_SYMBOL(tcf_exts_num_actions); 3325 3326 static __net_init int tcf_net_init(struct net *net) 3327 { 3328 struct tcf_net *tn = net_generic(net, tcf_net_id); 3329 3330 spin_lock_init(&tn->idr_lock); 3331 idr_init(&tn->idr); 3332 return 0; 3333 } 3334 3335 static void __net_exit tcf_net_exit(struct net *net) 3336 { 3337 struct tcf_net *tn = net_generic(net, tcf_net_id); 3338 3339 idr_destroy(&tn->idr); 3340 } 3341 3342 static struct pernet_operations tcf_net_ops = { 3343 .init = tcf_net_init, 3344 .exit = tcf_net_exit, 3345 .id = &tcf_net_id, 3346 .size = sizeof(struct tcf_net), 3347 }; 3348 3349 static int __init tc_filter_init(void) 3350 { 3351 int err; 3352 3353 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); 3354 if (!tc_filter_wq) 3355 return -ENOMEM; 3356 3357 err = register_pernet_subsys(&tcf_net_ops); 3358 if (err) 3359 goto err_register_pernet_subsys; 3360 3361 err = rhashtable_init(&indr_setup_block_ht, 3362 &tc_indr_setup_block_ht_params); 3363 if (err) 3364 goto err_rhash_setup_block_ht; 3365 3366 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 3367 RTNL_FLAG_DOIT_UNLOCKED); 3368 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 3369 RTNL_FLAG_DOIT_UNLOCKED); 3370 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, 3371 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED); 3372 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); 3373 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); 3374 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, 3375 tc_dump_chain, 0); 3376 3377 return 0; 3378 3379 err_rhash_setup_block_ht: 3380 unregister_pernet_subsys(&tcf_net_ops); 3381 err_register_pernet_subsys: 3382 destroy_workqueue(tc_filter_wq); 3383 return err; 3384 } 3385 3386 subsys_initcall(tc_filter_init); 3387