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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[mirror_ubuntu-jammy-kernel.git] / net / sched / cls_api.c
1 /*
2 * net/sched/cls_api.c Packet classifier API.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Changes:
12 *
13 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/err.h>
23 #include <linux/skbuff.h>
24 #include <linux/init.h>
25 #include <linux/kmod.h>
26 #include <linux/slab.h>
27 #include <linux/idr.h>
28 #include <linux/rhashtable.h>
29 #include <net/net_namespace.h>
30 #include <net/sock.h>
31 #include <net/netlink.h>
32 #include <net/pkt_sched.h>
33 #include <net/pkt_cls.h>
34 #include <net/tc_act/tc_pedit.h>
35 #include <net/tc_act/tc_mirred.h>
36 #include <net/tc_act/tc_vlan.h>
37 #include <net/tc_act/tc_tunnel_key.h>
38 #include <net/tc_act/tc_csum.h>
39 #include <net/tc_act/tc_gact.h>
40 #include <net/tc_act/tc_police.h>
41 #include <net/tc_act/tc_sample.h>
42 #include <net/tc_act/tc_skbedit.h>
43
44 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
45
46 /* The list of all installed classifier types */
47 static LIST_HEAD(tcf_proto_base);
48
49 /* Protects list of registered TC modules. It is pure SMP lock. */
50 static DEFINE_RWLOCK(cls_mod_lock);
51
52 /* Find classifier type by string name */
53
54 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
55 {
56 const struct tcf_proto_ops *t, *res = NULL;
57
58 if (kind) {
59 read_lock(&cls_mod_lock);
60 list_for_each_entry(t, &tcf_proto_base, head) {
61 if (strcmp(kind, t->kind) == 0) {
62 if (try_module_get(t->owner))
63 res = t;
64 break;
65 }
66 }
67 read_unlock(&cls_mod_lock);
68 }
69 return res;
70 }
71
72 static const struct tcf_proto_ops *
73 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
74 struct netlink_ext_ack *extack)
75 {
76 const struct tcf_proto_ops *ops;
77
78 ops = __tcf_proto_lookup_ops(kind);
79 if (ops)
80 return ops;
81 #ifdef CONFIG_MODULES
82 if (rtnl_held)
83 rtnl_unlock();
84 request_module("cls_%s", kind);
85 if (rtnl_held)
86 rtnl_lock();
87 ops = __tcf_proto_lookup_ops(kind);
88 /* We dropped the RTNL semaphore in order to perform
89 * the module load. So, even if we succeeded in loading
90 * the module we have to replay the request. We indicate
91 * this using -EAGAIN.
92 */
93 if (ops) {
94 module_put(ops->owner);
95 return ERR_PTR(-EAGAIN);
96 }
97 #endif
98 NL_SET_ERR_MSG(extack, "TC classifier not found");
99 return ERR_PTR(-ENOENT);
100 }
101
102 /* Register(unregister) new classifier type */
103
104 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
105 {
106 struct tcf_proto_ops *t;
107 int rc = -EEXIST;
108
109 write_lock(&cls_mod_lock);
110 list_for_each_entry(t, &tcf_proto_base, head)
111 if (!strcmp(ops->kind, t->kind))
112 goto out;
113
114 list_add_tail(&ops->head, &tcf_proto_base);
115 rc = 0;
116 out:
117 write_unlock(&cls_mod_lock);
118 return rc;
119 }
120 EXPORT_SYMBOL(register_tcf_proto_ops);
121
122 static struct workqueue_struct *tc_filter_wq;
123
124 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
125 {
126 struct tcf_proto_ops *t;
127 int rc = -ENOENT;
128
129 /* Wait for outstanding call_rcu()s, if any, from a
130 * tcf_proto_ops's destroy() handler.
131 */
132 rcu_barrier();
133 flush_workqueue(tc_filter_wq);
134
135 write_lock(&cls_mod_lock);
136 list_for_each_entry(t, &tcf_proto_base, head) {
137 if (t == ops) {
138 list_del(&t->head);
139 rc = 0;
140 break;
141 }
142 }
143 write_unlock(&cls_mod_lock);
144 return rc;
145 }
146 EXPORT_SYMBOL(unregister_tcf_proto_ops);
147
148 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
149 {
150 INIT_RCU_WORK(rwork, func);
151 return queue_rcu_work(tc_filter_wq, rwork);
152 }
153 EXPORT_SYMBOL(tcf_queue_work);
154
155 /* Select new prio value from the range, managed by kernel. */
156
157 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
158 {
159 u32 first = TC_H_MAKE(0xC0000000U, 0U);
160
161 if (tp)
162 first = tp->prio - 1;
163
164 return TC_H_MAJ(first);
165 }
166
167 static bool tcf_proto_is_unlocked(const char *kind)
168 {
169 const struct tcf_proto_ops *ops;
170 bool ret;
171
172 ops = tcf_proto_lookup_ops(kind, false, NULL);
173 /* On error return false to take rtnl lock. Proto lookup/create
174 * functions will perform lookup again and properly handle errors.
175 */
176 if (IS_ERR(ops))
177 return false;
178
179 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
180 module_put(ops->owner);
181 return ret;
182 }
183
184 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
185 u32 prio, struct tcf_chain *chain,
186 bool rtnl_held,
187 struct netlink_ext_ack *extack)
188 {
189 struct tcf_proto *tp;
190 int err;
191
192 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
193 if (!tp)
194 return ERR_PTR(-ENOBUFS);
195
196 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
197 if (IS_ERR(tp->ops)) {
198 err = PTR_ERR(tp->ops);
199 goto errout;
200 }
201 tp->classify = tp->ops->classify;
202 tp->protocol = protocol;
203 tp->prio = prio;
204 tp->chain = chain;
205 spin_lock_init(&tp->lock);
206 refcount_set(&tp->refcnt, 1);
207
208 err = tp->ops->init(tp);
209 if (err) {
210 module_put(tp->ops->owner);
211 goto errout;
212 }
213 return tp;
214
215 errout:
216 kfree(tp);
217 return ERR_PTR(err);
218 }
219
220 static void tcf_proto_get(struct tcf_proto *tp)
221 {
222 refcount_inc(&tp->refcnt);
223 }
224
225 static void tcf_chain_put(struct tcf_chain *chain);
226
227 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
228 struct netlink_ext_ack *extack)
229 {
230 tp->ops->destroy(tp, rtnl_held, extack);
231 tcf_chain_put(tp->chain);
232 module_put(tp->ops->owner);
233 kfree_rcu(tp, rcu);
234 }
235
236 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
237 struct netlink_ext_ack *extack)
238 {
239 if (refcount_dec_and_test(&tp->refcnt))
240 tcf_proto_destroy(tp, rtnl_held, extack);
241 }
242
243 static int walker_check_empty(struct tcf_proto *tp, void *fh,
244 struct tcf_walker *arg)
245 {
246 if (fh) {
247 arg->nonempty = true;
248 return -1;
249 }
250 return 0;
251 }
252
253 static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held)
254 {
255 struct tcf_walker walker = { .fn = walker_check_empty, };
256
257 if (tp->ops->walk) {
258 tp->ops->walk(tp, &walker, rtnl_held);
259 return !walker.nonempty;
260 }
261 return true;
262 }
263
264 static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held)
265 {
266 spin_lock(&tp->lock);
267 if (tcf_proto_is_empty(tp, rtnl_held))
268 tp->deleting = true;
269 spin_unlock(&tp->lock);
270 return tp->deleting;
271 }
272
273 static void tcf_proto_mark_delete(struct tcf_proto *tp)
274 {
275 spin_lock(&tp->lock);
276 tp->deleting = true;
277 spin_unlock(&tp->lock);
278 }
279
280 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
281 {
282 bool deleting;
283
284 spin_lock(&tp->lock);
285 deleting = tp->deleting;
286 spin_unlock(&tp->lock);
287
288 return deleting;
289 }
290
291 #define ASSERT_BLOCK_LOCKED(block) \
292 lockdep_assert_held(&(block)->lock)
293
294 struct tcf_filter_chain_list_item {
295 struct list_head list;
296 tcf_chain_head_change_t *chain_head_change;
297 void *chain_head_change_priv;
298 };
299
300 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
301 u32 chain_index)
302 {
303 struct tcf_chain *chain;
304
305 ASSERT_BLOCK_LOCKED(block);
306
307 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
308 if (!chain)
309 return NULL;
310 list_add_tail(&chain->list, &block->chain_list);
311 mutex_init(&chain->filter_chain_lock);
312 chain->block = block;
313 chain->index = chain_index;
314 chain->refcnt = 1;
315 if (!chain->index)
316 block->chain0.chain = chain;
317 return chain;
318 }
319
320 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
321 struct tcf_proto *tp_head)
322 {
323 if (item->chain_head_change)
324 item->chain_head_change(tp_head, item->chain_head_change_priv);
325 }
326
327 static void tcf_chain0_head_change(struct tcf_chain *chain,
328 struct tcf_proto *tp_head)
329 {
330 struct tcf_filter_chain_list_item *item;
331 struct tcf_block *block = chain->block;
332
333 if (chain->index)
334 return;
335
336 mutex_lock(&block->lock);
337 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
338 tcf_chain_head_change_item(item, tp_head);
339 mutex_unlock(&block->lock);
340 }
341
342 /* Returns true if block can be safely freed. */
343
344 static bool tcf_chain_detach(struct tcf_chain *chain)
345 {
346 struct tcf_block *block = chain->block;
347
348 ASSERT_BLOCK_LOCKED(block);
349
350 list_del(&chain->list);
351 if (!chain->index)
352 block->chain0.chain = NULL;
353
354 if (list_empty(&block->chain_list) &&
355 refcount_read(&block->refcnt) == 0)
356 return true;
357
358 return false;
359 }
360
361 static void tcf_block_destroy(struct tcf_block *block)
362 {
363 mutex_destroy(&block->lock);
364 kfree_rcu(block, rcu);
365 }
366
367 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
368 {
369 struct tcf_block *block = chain->block;
370
371 mutex_destroy(&chain->filter_chain_lock);
372 kfree_rcu(chain, rcu);
373 if (free_block)
374 tcf_block_destroy(block);
375 }
376
377 static void tcf_chain_hold(struct tcf_chain *chain)
378 {
379 ASSERT_BLOCK_LOCKED(chain->block);
380
381 ++chain->refcnt;
382 }
383
384 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
385 {
386 ASSERT_BLOCK_LOCKED(chain->block);
387
388 /* In case all the references are action references, this
389 * chain should not be shown to the user.
390 */
391 return chain->refcnt == chain->action_refcnt;
392 }
393
394 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
395 u32 chain_index)
396 {
397 struct tcf_chain *chain;
398
399 ASSERT_BLOCK_LOCKED(block);
400
401 list_for_each_entry(chain, &block->chain_list, list) {
402 if (chain->index == chain_index)
403 return chain;
404 }
405 return NULL;
406 }
407
408 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
409 u32 seq, u16 flags, int event, bool unicast);
410
411 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
412 u32 chain_index, bool create,
413 bool by_act)
414 {
415 struct tcf_chain *chain = NULL;
416 bool is_first_reference;
417
418 mutex_lock(&block->lock);
419 chain = tcf_chain_lookup(block, chain_index);
420 if (chain) {
421 tcf_chain_hold(chain);
422 } else {
423 if (!create)
424 goto errout;
425 chain = tcf_chain_create(block, chain_index);
426 if (!chain)
427 goto errout;
428 }
429
430 if (by_act)
431 ++chain->action_refcnt;
432 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
433 mutex_unlock(&block->lock);
434
435 /* Send notification only in case we got the first
436 * non-action reference. Until then, the chain acts only as
437 * a placeholder for actions pointing to it and user ought
438 * not know about them.
439 */
440 if (is_first_reference && !by_act)
441 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
442 RTM_NEWCHAIN, false);
443
444 return chain;
445
446 errout:
447 mutex_unlock(&block->lock);
448 return chain;
449 }
450
451 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
452 bool create)
453 {
454 return __tcf_chain_get(block, chain_index, create, false);
455 }
456
457 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
458 {
459 return __tcf_chain_get(block, chain_index, true, true);
460 }
461 EXPORT_SYMBOL(tcf_chain_get_by_act);
462
463 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
464 void *tmplt_priv);
465 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
466 void *tmplt_priv, u32 chain_index,
467 struct tcf_block *block, struct sk_buff *oskb,
468 u32 seq, u16 flags, bool unicast);
469
470 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
471 bool explicitly_created)
472 {
473 struct tcf_block *block = chain->block;
474 const struct tcf_proto_ops *tmplt_ops;
475 bool free_block = false;
476 unsigned int refcnt;
477 void *tmplt_priv;
478
479 mutex_lock(&block->lock);
480 if (explicitly_created) {
481 if (!chain->explicitly_created) {
482 mutex_unlock(&block->lock);
483 return;
484 }
485 chain->explicitly_created = false;
486 }
487
488 if (by_act)
489 chain->action_refcnt--;
490
491 /* tc_chain_notify_delete can't be called while holding block lock.
492 * However, when block is unlocked chain can be changed concurrently, so
493 * save these to temporary variables.
494 */
495 refcnt = --chain->refcnt;
496 tmplt_ops = chain->tmplt_ops;
497 tmplt_priv = chain->tmplt_priv;
498
499 /* The last dropped non-action reference will trigger notification. */
500 if (refcnt - chain->action_refcnt == 0 && !by_act) {
501 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
502 block, NULL, 0, 0, false);
503 /* Last reference to chain, no need to lock. */
504 chain->flushing = false;
505 }
506
507 if (refcnt == 0)
508 free_block = tcf_chain_detach(chain);
509 mutex_unlock(&block->lock);
510
511 if (refcnt == 0) {
512 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
513 tcf_chain_destroy(chain, free_block);
514 }
515 }
516
517 static void tcf_chain_put(struct tcf_chain *chain)
518 {
519 __tcf_chain_put(chain, false, false);
520 }
521
522 void tcf_chain_put_by_act(struct tcf_chain *chain)
523 {
524 __tcf_chain_put(chain, true, false);
525 }
526 EXPORT_SYMBOL(tcf_chain_put_by_act);
527
528 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
529 {
530 __tcf_chain_put(chain, false, true);
531 }
532
533 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
534 {
535 struct tcf_proto *tp, *tp_next;
536
537 mutex_lock(&chain->filter_chain_lock);
538 tp = tcf_chain_dereference(chain->filter_chain, chain);
539 RCU_INIT_POINTER(chain->filter_chain, NULL);
540 tcf_chain0_head_change(chain, NULL);
541 chain->flushing = true;
542 mutex_unlock(&chain->filter_chain_lock);
543
544 while (tp) {
545 tp_next = rcu_dereference_protected(tp->next, 1);
546 tcf_proto_put(tp, rtnl_held, NULL);
547 tp = tp_next;
548 }
549 }
550
551 static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
552 {
553 const struct Qdisc_class_ops *cops;
554 struct Qdisc *qdisc;
555
556 if (!dev_ingress_queue(dev))
557 return NULL;
558
559 qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
560 if (!qdisc)
561 return NULL;
562
563 cops = qdisc->ops->cl_ops;
564 if (!cops)
565 return NULL;
566
567 if (!cops->tcf_block)
568 return NULL;
569
570 return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
571 }
572
573 static struct rhashtable indr_setup_block_ht;
574
575 struct tc_indr_block_dev {
576 struct rhash_head ht_node;
577 struct net_device *dev;
578 unsigned int refcnt;
579 struct list_head cb_list;
580 struct tcf_block *block;
581 };
582
583 struct tc_indr_block_cb {
584 struct list_head list;
585 void *cb_priv;
586 tc_indr_block_bind_cb_t *cb;
587 void *cb_ident;
588 };
589
590 static const struct rhashtable_params tc_indr_setup_block_ht_params = {
591 .key_offset = offsetof(struct tc_indr_block_dev, dev),
592 .head_offset = offsetof(struct tc_indr_block_dev, ht_node),
593 .key_len = sizeof(struct net_device *),
594 };
595
596 static struct tc_indr_block_dev *
597 tc_indr_block_dev_lookup(struct net_device *dev)
598 {
599 return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
600 tc_indr_setup_block_ht_params);
601 }
602
603 static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev)
604 {
605 struct tc_indr_block_dev *indr_dev;
606
607 indr_dev = tc_indr_block_dev_lookup(dev);
608 if (indr_dev)
609 goto inc_ref;
610
611 indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
612 if (!indr_dev)
613 return NULL;
614
615 INIT_LIST_HEAD(&indr_dev->cb_list);
616 indr_dev->dev = dev;
617 indr_dev->block = tc_dev_ingress_block(dev);
618 if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
619 tc_indr_setup_block_ht_params)) {
620 kfree(indr_dev);
621 return NULL;
622 }
623
624 inc_ref:
625 indr_dev->refcnt++;
626 return indr_dev;
627 }
628
629 static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev)
630 {
631 if (--indr_dev->refcnt)
632 return;
633
634 rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
635 tc_indr_setup_block_ht_params);
636 kfree(indr_dev);
637 }
638
639 static struct tc_indr_block_cb *
640 tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev,
641 tc_indr_block_bind_cb_t *cb, void *cb_ident)
642 {
643 struct tc_indr_block_cb *indr_block_cb;
644
645 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
646 if (indr_block_cb->cb == cb &&
647 indr_block_cb->cb_ident == cb_ident)
648 return indr_block_cb;
649 return NULL;
650 }
651
652 static struct tc_indr_block_cb *
653 tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv,
654 tc_indr_block_bind_cb_t *cb, void *cb_ident)
655 {
656 struct tc_indr_block_cb *indr_block_cb;
657
658 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
659 if (indr_block_cb)
660 return ERR_PTR(-EEXIST);
661
662 indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
663 if (!indr_block_cb)
664 return ERR_PTR(-ENOMEM);
665
666 indr_block_cb->cb_priv = cb_priv;
667 indr_block_cb->cb = cb;
668 indr_block_cb->cb_ident = cb_ident;
669 list_add(&indr_block_cb->list, &indr_dev->cb_list);
670
671 return indr_block_cb;
672 }
673
674 static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb)
675 {
676 list_del(&indr_block_cb->list);
677 kfree(indr_block_cb);
678 }
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 tc_block_command command)
683 {
684 struct tc_block_offload bo = {
685 .command = command,
686 .binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
687 .block = indr_dev->block,
688 };
689
690 if (!indr_dev->block)
691 return;
692
693 indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
694 &bo);
695 }
696
697 int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
698 tc_indr_block_bind_cb_t *cb, void *cb_ident)
699 {
700 struct tc_indr_block_cb *indr_block_cb;
701 struct tc_indr_block_dev *indr_dev;
702 int err;
703
704 indr_dev = tc_indr_block_dev_get(dev);
705 if (!indr_dev)
706 return -ENOMEM;
707
708 indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
709 err = PTR_ERR_OR_ZERO(indr_block_cb);
710 if (err)
711 goto err_dev_put;
712
713 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND);
714 return 0;
715
716 err_dev_put:
717 tc_indr_block_dev_put(indr_dev);
718 return err;
719 }
720 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register);
721
722 int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
723 tc_indr_block_bind_cb_t *cb, void *cb_ident)
724 {
725 int err;
726
727 rtnl_lock();
728 err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
729 rtnl_unlock();
730
731 return err;
732 }
733 EXPORT_SYMBOL_GPL(tc_indr_block_cb_register);
734
735 void __tc_indr_block_cb_unregister(struct net_device *dev,
736 tc_indr_block_bind_cb_t *cb, void *cb_ident)
737 {
738 struct tc_indr_block_cb *indr_block_cb;
739 struct tc_indr_block_dev *indr_dev;
740
741 indr_dev = tc_indr_block_dev_lookup(dev);
742 if (!indr_dev)
743 return;
744
745 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
746 if (!indr_block_cb)
747 return;
748
749 /* Send unbind message if required to free any block cbs. */
750 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND);
751 tc_indr_block_cb_del(indr_block_cb);
752 tc_indr_block_dev_put(indr_dev);
753 }
754 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister);
755
756 void tc_indr_block_cb_unregister(struct net_device *dev,
757 tc_indr_block_bind_cb_t *cb, void *cb_ident)
758 {
759 rtnl_lock();
760 __tc_indr_block_cb_unregister(dev, cb, cb_ident);
761 rtnl_unlock();
762 }
763 EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister);
764
765 static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
766 struct tcf_block_ext_info *ei,
767 enum tc_block_command command,
768 struct netlink_ext_ack *extack)
769 {
770 struct tc_indr_block_cb *indr_block_cb;
771 struct tc_indr_block_dev *indr_dev;
772 struct tc_block_offload bo = {
773 .command = command,
774 .binder_type = ei->binder_type,
775 .block = block,
776 .extack = extack,
777 };
778
779 indr_dev = tc_indr_block_dev_lookup(dev);
780 if (!indr_dev)
781 return;
782
783 indr_dev->block = command == TC_BLOCK_BIND ? block : NULL;
784
785 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
786 indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
787 &bo);
788 }
789
790 static bool tcf_block_offload_in_use(struct tcf_block *block)
791 {
792 return block->offloadcnt;
793 }
794
795 static int tcf_block_offload_cmd(struct tcf_block *block,
796 struct net_device *dev,
797 struct tcf_block_ext_info *ei,
798 enum tc_block_command command,
799 struct netlink_ext_ack *extack)
800 {
801 struct tc_block_offload bo = {};
802
803 bo.command = command;
804 bo.binder_type = ei->binder_type;
805 bo.block = block;
806 bo.extack = extack;
807 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
808 }
809
810 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
811 struct tcf_block_ext_info *ei,
812 struct netlink_ext_ack *extack)
813 {
814 struct net_device *dev = q->dev_queue->dev;
815 int err;
816
817 if (!dev->netdev_ops->ndo_setup_tc)
818 goto no_offload_dev_inc;
819
820 /* If tc offload feature is disabled and the block we try to bind
821 * to already has some offloaded filters, forbid to bind.
822 */
823 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
824 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
825 return -EOPNOTSUPP;
826 }
827
828 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
829 if (err == -EOPNOTSUPP)
830 goto no_offload_dev_inc;
831 if (err)
832 return err;
833
834 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
835 return 0;
836
837 no_offload_dev_inc:
838 if (tcf_block_offload_in_use(block))
839 return -EOPNOTSUPP;
840 block->nooffloaddevcnt++;
841 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
842 return 0;
843 }
844
845 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
846 struct tcf_block_ext_info *ei)
847 {
848 struct net_device *dev = q->dev_queue->dev;
849 int err;
850
851 tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL);
852
853 if (!dev->netdev_ops->ndo_setup_tc)
854 goto no_offload_dev_dec;
855 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
856 if (err == -EOPNOTSUPP)
857 goto no_offload_dev_dec;
858 return;
859
860 no_offload_dev_dec:
861 WARN_ON(block->nooffloaddevcnt-- == 0);
862 }
863
864 static int
865 tcf_chain0_head_change_cb_add(struct tcf_block *block,
866 struct tcf_block_ext_info *ei,
867 struct netlink_ext_ack *extack)
868 {
869 struct tcf_filter_chain_list_item *item;
870 struct tcf_chain *chain0;
871
872 item = kmalloc(sizeof(*item), GFP_KERNEL);
873 if (!item) {
874 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
875 return -ENOMEM;
876 }
877 item->chain_head_change = ei->chain_head_change;
878 item->chain_head_change_priv = ei->chain_head_change_priv;
879
880 mutex_lock(&block->lock);
881 chain0 = block->chain0.chain;
882 if (chain0)
883 tcf_chain_hold(chain0);
884 else
885 list_add(&item->list, &block->chain0.filter_chain_list);
886 mutex_unlock(&block->lock);
887
888 if (chain0) {
889 struct tcf_proto *tp_head;
890
891 mutex_lock(&chain0->filter_chain_lock);
892
893 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
894 if (tp_head)
895 tcf_chain_head_change_item(item, tp_head);
896
897 mutex_lock(&block->lock);
898 list_add(&item->list, &block->chain0.filter_chain_list);
899 mutex_unlock(&block->lock);
900
901 mutex_unlock(&chain0->filter_chain_lock);
902 tcf_chain_put(chain0);
903 }
904
905 return 0;
906 }
907
908 static void
909 tcf_chain0_head_change_cb_del(struct tcf_block *block,
910 struct tcf_block_ext_info *ei)
911 {
912 struct tcf_filter_chain_list_item *item;
913
914 mutex_lock(&block->lock);
915 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
916 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
917 (item->chain_head_change == ei->chain_head_change &&
918 item->chain_head_change_priv == ei->chain_head_change_priv)) {
919 if (block->chain0.chain)
920 tcf_chain_head_change_item(item, NULL);
921 list_del(&item->list);
922 mutex_unlock(&block->lock);
923
924 kfree(item);
925 return;
926 }
927 }
928 mutex_unlock(&block->lock);
929 WARN_ON(1);
930 }
931
932 struct tcf_net {
933 spinlock_t idr_lock; /* Protects idr */
934 struct idr idr;
935 };
936
937 static unsigned int tcf_net_id;
938
939 static int tcf_block_insert(struct tcf_block *block, struct net *net,
940 struct netlink_ext_ack *extack)
941 {
942 struct tcf_net *tn = net_generic(net, tcf_net_id);
943 int err;
944
945 idr_preload(GFP_KERNEL);
946 spin_lock(&tn->idr_lock);
947 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
948 GFP_NOWAIT);
949 spin_unlock(&tn->idr_lock);
950 idr_preload_end();
951
952 return err;
953 }
954
955 static void tcf_block_remove(struct tcf_block *block, struct net *net)
956 {
957 struct tcf_net *tn = net_generic(net, tcf_net_id);
958
959 spin_lock(&tn->idr_lock);
960 idr_remove(&tn->idr, block->index);
961 spin_unlock(&tn->idr_lock);
962 }
963
964 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
965 u32 block_index,
966 struct netlink_ext_ack *extack)
967 {
968 struct tcf_block *block;
969
970 block = kzalloc(sizeof(*block), GFP_KERNEL);
971 if (!block) {
972 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
973 return ERR_PTR(-ENOMEM);
974 }
975 mutex_init(&block->lock);
976 INIT_LIST_HEAD(&block->chain_list);
977 INIT_LIST_HEAD(&block->cb_list);
978 INIT_LIST_HEAD(&block->owner_list);
979 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
980
981 refcount_set(&block->refcnt, 1);
982 block->net = net;
983 block->index = block_index;
984
985 /* Don't store q pointer for blocks which are shared */
986 if (!tcf_block_shared(block))
987 block->q = q;
988 return block;
989 }
990
991 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
992 {
993 struct tcf_net *tn = net_generic(net, tcf_net_id);
994
995 return idr_find(&tn->idr, block_index);
996 }
997
998 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
999 {
1000 struct tcf_block *block;
1001
1002 rcu_read_lock();
1003 block = tcf_block_lookup(net, block_index);
1004 if (block && !refcount_inc_not_zero(&block->refcnt))
1005 block = NULL;
1006 rcu_read_unlock();
1007
1008 return block;
1009 }
1010
1011 static struct tcf_chain *
1012 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1013 {
1014 mutex_lock(&block->lock);
1015 if (chain)
1016 chain = list_is_last(&chain->list, &block->chain_list) ?
1017 NULL : list_next_entry(chain, list);
1018 else
1019 chain = list_first_entry_or_null(&block->chain_list,
1020 struct tcf_chain, list);
1021
1022 /* skip all action-only chains */
1023 while (chain && tcf_chain_held_by_acts_only(chain))
1024 chain = list_is_last(&chain->list, &block->chain_list) ?
1025 NULL : list_next_entry(chain, list);
1026
1027 if (chain)
1028 tcf_chain_hold(chain);
1029 mutex_unlock(&block->lock);
1030
1031 return chain;
1032 }
1033
1034 /* Function to be used by all clients that want to iterate over all chains on
1035 * block. It properly obtains block->lock and takes reference to chain before
1036 * returning it. Users of this function must be tolerant to concurrent chain
1037 * insertion/deletion or ensure that no concurrent chain modification is
1038 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1039 * consistent dump because rtnl lock is released each time skb is filled with
1040 * data and sent to user-space.
1041 */
1042
1043 struct tcf_chain *
1044 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1045 {
1046 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1047
1048 if (chain)
1049 tcf_chain_put(chain);
1050
1051 return chain_next;
1052 }
1053 EXPORT_SYMBOL(tcf_get_next_chain);
1054
1055 static struct tcf_proto *
1056 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1057 {
1058 u32 prio = 0;
1059
1060 ASSERT_RTNL();
1061 mutex_lock(&chain->filter_chain_lock);
1062
1063 if (!tp) {
1064 tp = tcf_chain_dereference(chain->filter_chain, chain);
1065 } else if (tcf_proto_is_deleting(tp)) {
1066 /* 'deleting' flag is set and chain->filter_chain_lock was
1067 * unlocked, which means next pointer could be invalid. Restart
1068 * search.
1069 */
1070 prio = tp->prio + 1;
1071 tp = tcf_chain_dereference(chain->filter_chain, chain);
1072
1073 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1074 if (!tp->deleting && tp->prio >= prio)
1075 break;
1076 } else {
1077 tp = tcf_chain_dereference(tp->next, chain);
1078 }
1079
1080 if (tp)
1081 tcf_proto_get(tp);
1082
1083 mutex_unlock(&chain->filter_chain_lock);
1084
1085 return tp;
1086 }
1087
1088 /* Function to be used by all clients that want to iterate over all tp's on
1089 * chain. Users of this function must be tolerant to concurrent tp
1090 * insertion/deletion or ensure that no concurrent chain modification is
1091 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1092 * consistent dump because rtnl lock is released each time skb is filled with
1093 * data and sent to user-space.
1094 */
1095
1096 struct tcf_proto *
1097 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
1098 bool rtnl_held)
1099 {
1100 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1101
1102 if (tp)
1103 tcf_proto_put(tp, rtnl_held, NULL);
1104
1105 return tp_next;
1106 }
1107 EXPORT_SYMBOL(tcf_get_next_proto);
1108
1109 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1110 {
1111 struct tcf_chain *chain;
1112
1113 /* Last reference to block. At this point chains cannot be added or
1114 * removed concurrently.
1115 */
1116 for (chain = tcf_get_next_chain(block, NULL);
1117 chain;
1118 chain = tcf_get_next_chain(block, chain)) {
1119 tcf_chain_put_explicitly_created(chain);
1120 tcf_chain_flush(chain, rtnl_held);
1121 }
1122 }
1123
1124 /* Lookup Qdisc and increments its reference counter.
1125 * Set parent, if necessary.
1126 */
1127
1128 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1129 u32 *parent, int ifindex, bool rtnl_held,
1130 struct netlink_ext_ack *extack)
1131 {
1132 const struct Qdisc_class_ops *cops;
1133 struct net_device *dev;
1134 int err = 0;
1135
1136 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1137 return 0;
1138
1139 rcu_read_lock();
1140
1141 /* Find link */
1142 dev = dev_get_by_index_rcu(net, ifindex);
1143 if (!dev) {
1144 rcu_read_unlock();
1145 return -ENODEV;
1146 }
1147
1148 /* Find qdisc */
1149 if (!*parent) {
1150 *q = dev->qdisc;
1151 *parent = (*q)->handle;
1152 } else {
1153 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1154 if (!*q) {
1155 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1156 err = -EINVAL;
1157 goto errout_rcu;
1158 }
1159 }
1160
1161 *q = qdisc_refcount_inc_nz(*q);
1162 if (!*q) {
1163 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1164 err = -EINVAL;
1165 goto errout_rcu;
1166 }
1167
1168 /* Is it classful? */
1169 cops = (*q)->ops->cl_ops;
1170 if (!cops) {
1171 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1172 err = -EINVAL;
1173 goto errout_qdisc;
1174 }
1175
1176 if (!cops->tcf_block) {
1177 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1178 err = -EOPNOTSUPP;
1179 goto errout_qdisc;
1180 }
1181
1182 errout_rcu:
1183 /* At this point we know that qdisc is not noop_qdisc,
1184 * which means that qdisc holds a reference to net_device
1185 * and we hold a reference to qdisc, so it is safe to release
1186 * rcu read lock.
1187 */
1188 rcu_read_unlock();
1189 return err;
1190
1191 errout_qdisc:
1192 rcu_read_unlock();
1193
1194 if (rtnl_held)
1195 qdisc_put(*q);
1196 else
1197 qdisc_put_unlocked(*q);
1198 *q = NULL;
1199
1200 return err;
1201 }
1202
1203 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1204 int ifindex, struct netlink_ext_ack *extack)
1205 {
1206 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1207 return 0;
1208
1209 /* Do we search for filter, attached to class? */
1210 if (TC_H_MIN(parent)) {
1211 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1212
1213 *cl = cops->find(q, parent);
1214 if (*cl == 0) {
1215 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1216 return -ENOENT;
1217 }
1218 }
1219
1220 return 0;
1221 }
1222
1223 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1224 unsigned long cl, int ifindex,
1225 u32 block_index,
1226 struct netlink_ext_ack *extack)
1227 {
1228 struct tcf_block *block;
1229
1230 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1231 block = tcf_block_refcnt_get(net, block_index);
1232 if (!block) {
1233 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1234 return ERR_PTR(-EINVAL);
1235 }
1236 } else {
1237 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1238
1239 block = cops->tcf_block(q, cl, extack);
1240 if (!block)
1241 return ERR_PTR(-EINVAL);
1242
1243 if (tcf_block_shared(block)) {
1244 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1245 return ERR_PTR(-EOPNOTSUPP);
1246 }
1247
1248 /* Always take reference to block in order to support execution
1249 * of rules update path of cls API without rtnl lock. Caller
1250 * must release block when it is finished using it. 'if' block
1251 * of this conditional obtain reference to block by calling
1252 * tcf_block_refcnt_get().
1253 */
1254 refcount_inc(&block->refcnt);
1255 }
1256
1257 return block;
1258 }
1259
1260 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1261 struct tcf_block_ext_info *ei, bool rtnl_held)
1262 {
1263 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1264 /* Flushing/putting all chains will cause the block to be
1265 * deallocated when last chain is freed. However, if chain_list
1266 * is empty, block has to be manually deallocated. After block
1267 * reference counter reached 0, it is no longer possible to
1268 * increment it or add new chains to block.
1269 */
1270 bool free_block = list_empty(&block->chain_list);
1271
1272 mutex_unlock(&block->lock);
1273 if (tcf_block_shared(block))
1274 tcf_block_remove(block, block->net);
1275
1276 if (q)
1277 tcf_block_offload_unbind(block, q, ei);
1278
1279 if (free_block)
1280 tcf_block_destroy(block);
1281 else
1282 tcf_block_flush_all_chains(block, rtnl_held);
1283 } else if (q) {
1284 tcf_block_offload_unbind(block, q, ei);
1285 }
1286 }
1287
1288 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1289 {
1290 __tcf_block_put(block, NULL, NULL, rtnl_held);
1291 }
1292
1293 /* Find tcf block.
1294 * Set q, parent, cl when appropriate.
1295 */
1296
1297 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1298 u32 *parent, unsigned long *cl,
1299 int ifindex, u32 block_index,
1300 struct netlink_ext_ack *extack)
1301 {
1302 struct tcf_block *block;
1303 int err = 0;
1304
1305 ASSERT_RTNL();
1306
1307 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1308 if (err)
1309 goto errout;
1310
1311 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1312 if (err)
1313 goto errout_qdisc;
1314
1315 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1316 if (IS_ERR(block)) {
1317 err = PTR_ERR(block);
1318 goto errout_qdisc;
1319 }
1320
1321 return block;
1322
1323 errout_qdisc:
1324 if (*q)
1325 qdisc_put(*q);
1326 errout:
1327 *q = NULL;
1328 return ERR_PTR(err);
1329 }
1330
1331 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1332 bool rtnl_held)
1333 {
1334 if (!IS_ERR_OR_NULL(block))
1335 tcf_block_refcnt_put(block, rtnl_held);
1336
1337 if (q) {
1338 if (rtnl_held)
1339 qdisc_put(q);
1340 else
1341 qdisc_put_unlocked(q);
1342 }
1343 }
1344
1345 struct tcf_block_owner_item {
1346 struct list_head list;
1347 struct Qdisc *q;
1348 enum tcf_block_binder_type binder_type;
1349 };
1350
1351 static void
1352 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1353 struct Qdisc *q,
1354 enum tcf_block_binder_type binder_type)
1355 {
1356 if (block->keep_dst &&
1357 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1358 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1359 netif_keep_dst(qdisc_dev(q));
1360 }
1361
1362 void tcf_block_netif_keep_dst(struct tcf_block *block)
1363 {
1364 struct tcf_block_owner_item *item;
1365
1366 block->keep_dst = true;
1367 list_for_each_entry(item, &block->owner_list, list)
1368 tcf_block_owner_netif_keep_dst(block, item->q,
1369 item->binder_type);
1370 }
1371 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1372
1373 static int tcf_block_owner_add(struct tcf_block *block,
1374 struct Qdisc *q,
1375 enum tcf_block_binder_type binder_type)
1376 {
1377 struct tcf_block_owner_item *item;
1378
1379 item = kmalloc(sizeof(*item), GFP_KERNEL);
1380 if (!item)
1381 return -ENOMEM;
1382 item->q = q;
1383 item->binder_type = binder_type;
1384 list_add(&item->list, &block->owner_list);
1385 return 0;
1386 }
1387
1388 static void tcf_block_owner_del(struct tcf_block *block,
1389 struct Qdisc *q,
1390 enum tcf_block_binder_type binder_type)
1391 {
1392 struct tcf_block_owner_item *item;
1393
1394 list_for_each_entry(item, &block->owner_list, list) {
1395 if (item->q == q && item->binder_type == binder_type) {
1396 list_del(&item->list);
1397 kfree(item);
1398 return;
1399 }
1400 }
1401 WARN_ON(1);
1402 }
1403
1404 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1405 struct tcf_block_ext_info *ei,
1406 struct netlink_ext_ack *extack)
1407 {
1408 struct net *net = qdisc_net(q);
1409 struct tcf_block *block = NULL;
1410 int err;
1411
1412 if (ei->block_index)
1413 /* block_index not 0 means the shared block is requested */
1414 block = tcf_block_refcnt_get(net, ei->block_index);
1415
1416 if (!block) {
1417 block = tcf_block_create(net, q, ei->block_index, extack);
1418 if (IS_ERR(block))
1419 return PTR_ERR(block);
1420 if (tcf_block_shared(block)) {
1421 err = tcf_block_insert(block, net, extack);
1422 if (err)
1423 goto err_block_insert;
1424 }
1425 }
1426
1427 err = tcf_block_owner_add(block, q, ei->binder_type);
1428 if (err)
1429 goto err_block_owner_add;
1430
1431 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1432
1433 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1434 if (err)
1435 goto err_chain0_head_change_cb_add;
1436
1437 err = tcf_block_offload_bind(block, q, ei, extack);
1438 if (err)
1439 goto err_block_offload_bind;
1440
1441 *p_block = block;
1442 return 0;
1443
1444 err_block_offload_bind:
1445 tcf_chain0_head_change_cb_del(block, ei);
1446 err_chain0_head_change_cb_add:
1447 tcf_block_owner_del(block, q, ei->binder_type);
1448 err_block_owner_add:
1449 err_block_insert:
1450 tcf_block_refcnt_put(block, true);
1451 return err;
1452 }
1453 EXPORT_SYMBOL(tcf_block_get_ext);
1454
1455 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1456 {
1457 struct tcf_proto __rcu **p_filter_chain = priv;
1458
1459 rcu_assign_pointer(*p_filter_chain, tp_head);
1460 }
1461
1462 int tcf_block_get(struct tcf_block **p_block,
1463 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1464 struct netlink_ext_ack *extack)
1465 {
1466 struct tcf_block_ext_info ei = {
1467 .chain_head_change = tcf_chain_head_change_dflt,
1468 .chain_head_change_priv = p_filter_chain,
1469 };
1470
1471 WARN_ON(!p_filter_chain);
1472 return tcf_block_get_ext(p_block, q, &ei, extack);
1473 }
1474 EXPORT_SYMBOL(tcf_block_get);
1475
1476 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1477 * actions should be all removed after flushing.
1478 */
1479 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1480 struct tcf_block_ext_info *ei)
1481 {
1482 if (!block)
1483 return;
1484 tcf_chain0_head_change_cb_del(block, ei);
1485 tcf_block_owner_del(block, q, ei->binder_type);
1486
1487 __tcf_block_put(block, q, ei, true);
1488 }
1489 EXPORT_SYMBOL(tcf_block_put_ext);
1490
1491 void tcf_block_put(struct tcf_block *block)
1492 {
1493 struct tcf_block_ext_info ei = {0, };
1494
1495 if (!block)
1496 return;
1497 tcf_block_put_ext(block, block->q, &ei);
1498 }
1499
1500 EXPORT_SYMBOL(tcf_block_put);
1501
1502 struct tcf_block_cb {
1503 struct list_head list;
1504 tc_setup_cb_t *cb;
1505 void *cb_ident;
1506 void *cb_priv;
1507 unsigned int refcnt;
1508 };
1509
1510 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
1511 {
1512 return block_cb->cb_priv;
1513 }
1514 EXPORT_SYMBOL(tcf_block_cb_priv);
1515
1516 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
1517 tc_setup_cb_t *cb, void *cb_ident)
1518 { struct tcf_block_cb *block_cb;
1519
1520 list_for_each_entry(block_cb, &block->cb_list, list)
1521 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
1522 return block_cb;
1523 return NULL;
1524 }
1525 EXPORT_SYMBOL(tcf_block_cb_lookup);
1526
1527 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
1528 {
1529 block_cb->refcnt++;
1530 }
1531 EXPORT_SYMBOL(tcf_block_cb_incref);
1532
1533 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
1534 {
1535 return --block_cb->refcnt;
1536 }
1537 EXPORT_SYMBOL(tcf_block_cb_decref);
1538
1539 static int
1540 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
1541 void *cb_priv, bool add, bool offload_in_use,
1542 struct netlink_ext_ack *extack)
1543 {
1544 struct tcf_chain *chain, *chain_prev;
1545 struct tcf_proto *tp, *tp_prev;
1546 int err;
1547
1548 for (chain = __tcf_get_next_chain(block, NULL);
1549 chain;
1550 chain_prev = chain,
1551 chain = __tcf_get_next_chain(block, chain),
1552 tcf_chain_put(chain_prev)) {
1553 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1554 tp_prev = tp,
1555 tp = __tcf_get_next_proto(chain, tp),
1556 tcf_proto_put(tp_prev, true, NULL)) {
1557 if (tp->ops->reoffload) {
1558 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1559 extack);
1560 if (err && add)
1561 goto err_playback_remove;
1562 } else if (add && offload_in_use) {
1563 err = -EOPNOTSUPP;
1564 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1565 goto err_playback_remove;
1566 }
1567 }
1568 }
1569
1570 return 0;
1571
1572 err_playback_remove:
1573 tcf_proto_put(tp, true, NULL);
1574 tcf_chain_put(chain);
1575 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1576 extack);
1577 return err;
1578 }
1579
1580 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
1581 tc_setup_cb_t *cb, void *cb_ident,
1582 void *cb_priv,
1583 struct netlink_ext_ack *extack)
1584 {
1585 struct tcf_block_cb *block_cb;
1586 int err;
1587
1588 /* Replay any already present rules */
1589 err = tcf_block_playback_offloads(block, cb, cb_priv, true,
1590 tcf_block_offload_in_use(block),
1591 extack);
1592 if (err)
1593 return ERR_PTR(err);
1594
1595 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
1596 if (!block_cb)
1597 return ERR_PTR(-ENOMEM);
1598 block_cb->cb = cb;
1599 block_cb->cb_ident = cb_ident;
1600 block_cb->cb_priv = cb_priv;
1601 list_add(&block_cb->list, &block->cb_list);
1602 return block_cb;
1603 }
1604 EXPORT_SYMBOL(__tcf_block_cb_register);
1605
1606 int tcf_block_cb_register(struct tcf_block *block,
1607 tc_setup_cb_t *cb, void *cb_ident,
1608 void *cb_priv, struct netlink_ext_ack *extack)
1609 {
1610 struct tcf_block_cb *block_cb;
1611
1612 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
1613 extack);
1614 return PTR_ERR_OR_ZERO(block_cb);
1615 }
1616 EXPORT_SYMBOL(tcf_block_cb_register);
1617
1618 void __tcf_block_cb_unregister(struct tcf_block *block,
1619 struct tcf_block_cb *block_cb)
1620 {
1621 tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
1622 false, tcf_block_offload_in_use(block),
1623 NULL);
1624 list_del(&block_cb->list);
1625 kfree(block_cb);
1626 }
1627 EXPORT_SYMBOL(__tcf_block_cb_unregister);
1628
1629 void tcf_block_cb_unregister(struct tcf_block *block,
1630 tc_setup_cb_t *cb, void *cb_ident)
1631 {
1632 struct tcf_block_cb *block_cb;
1633
1634 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
1635 if (!block_cb)
1636 return;
1637 __tcf_block_cb_unregister(block, block_cb);
1638 }
1639 EXPORT_SYMBOL(tcf_block_cb_unregister);
1640
1641 /* Main classifier routine: scans classifier chain attached
1642 * to this qdisc, (optionally) tests for protocol and asks
1643 * specific classifiers.
1644 */
1645 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1646 struct tcf_result *res, bool compat_mode)
1647 {
1648 #ifdef CONFIG_NET_CLS_ACT
1649 const int max_reclassify_loop = 4;
1650 const struct tcf_proto *orig_tp = tp;
1651 const struct tcf_proto *first_tp;
1652 int limit = 0;
1653
1654 reclassify:
1655 #endif
1656 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1657 __be16 protocol = tc_skb_protocol(skb);
1658 int err;
1659
1660 if (tp->protocol != protocol &&
1661 tp->protocol != htons(ETH_P_ALL))
1662 continue;
1663
1664 err = tp->classify(skb, tp, res);
1665 #ifdef CONFIG_NET_CLS_ACT
1666 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1667 first_tp = orig_tp;
1668 goto reset;
1669 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1670 first_tp = res->goto_tp;
1671 goto reset;
1672 }
1673 #endif
1674 if (err >= 0)
1675 return err;
1676 }
1677
1678 return TC_ACT_UNSPEC; /* signal: continue lookup */
1679 #ifdef CONFIG_NET_CLS_ACT
1680 reset:
1681 if (unlikely(limit++ >= max_reclassify_loop)) {
1682 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1683 tp->chain->block->index,
1684 tp->prio & 0xffff,
1685 ntohs(tp->protocol));
1686 return TC_ACT_SHOT;
1687 }
1688
1689 tp = first_tp;
1690 goto reclassify;
1691 #endif
1692 }
1693 EXPORT_SYMBOL(tcf_classify);
1694
1695 struct tcf_chain_info {
1696 struct tcf_proto __rcu **pprev;
1697 struct tcf_proto __rcu *next;
1698 };
1699
1700 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1701 struct tcf_chain_info *chain_info)
1702 {
1703 return tcf_chain_dereference(*chain_info->pprev, chain);
1704 }
1705
1706 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1707 struct tcf_chain_info *chain_info,
1708 struct tcf_proto *tp)
1709 {
1710 if (chain->flushing)
1711 return -EAGAIN;
1712
1713 if (*chain_info->pprev == chain->filter_chain)
1714 tcf_chain0_head_change(chain, tp);
1715 tcf_proto_get(tp);
1716 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1717 rcu_assign_pointer(*chain_info->pprev, tp);
1718
1719 return 0;
1720 }
1721
1722 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1723 struct tcf_chain_info *chain_info,
1724 struct tcf_proto *tp)
1725 {
1726 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1727
1728 tcf_proto_mark_delete(tp);
1729 if (tp == chain->filter_chain)
1730 tcf_chain0_head_change(chain, next);
1731 RCU_INIT_POINTER(*chain_info->pprev, next);
1732 }
1733
1734 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1735 struct tcf_chain_info *chain_info,
1736 u32 protocol, u32 prio,
1737 bool prio_allocate);
1738
1739 /* Try to insert new proto.
1740 * If proto with specified priority already exists, free new proto
1741 * and return existing one.
1742 */
1743
1744 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1745 struct tcf_proto *tp_new,
1746 u32 protocol, u32 prio,
1747 bool rtnl_held)
1748 {
1749 struct tcf_chain_info chain_info;
1750 struct tcf_proto *tp;
1751 int err = 0;
1752
1753 mutex_lock(&chain->filter_chain_lock);
1754
1755 tp = tcf_chain_tp_find(chain, &chain_info,
1756 protocol, prio, false);
1757 if (!tp)
1758 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1759 mutex_unlock(&chain->filter_chain_lock);
1760
1761 if (tp) {
1762 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1763 tp_new = tp;
1764 } else if (err) {
1765 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1766 tp_new = ERR_PTR(err);
1767 }
1768
1769 return tp_new;
1770 }
1771
1772 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1773 struct tcf_proto *tp, bool rtnl_held,
1774 struct netlink_ext_ack *extack)
1775 {
1776 struct tcf_chain_info chain_info;
1777 struct tcf_proto *tp_iter;
1778 struct tcf_proto **pprev;
1779 struct tcf_proto *next;
1780
1781 mutex_lock(&chain->filter_chain_lock);
1782
1783 /* Atomically find and remove tp from chain. */
1784 for (pprev = &chain->filter_chain;
1785 (tp_iter = tcf_chain_dereference(*pprev, chain));
1786 pprev = &tp_iter->next) {
1787 if (tp_iter == tp) {
1788 chain_info.pprev = pprev;
1789 chain_info.next = tp_iter->next;
1790 WARN_ON(tp_iter->deleting);
1791 break;
1792 }
1793 }
1794 /* Verify that tp still exists and no new filters were inserted
1795 * concurrently.
1796 * Mark tp for deletion if it is empty.
1797 */
1798 if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) {
1799 mutex_unlock(&chain->filter_chain_lock);
1800 return;
1801 }
1802
1803 next = tcf_chain_dereference(chain_info.next, chain);
1804 if (tp == chain->filter_chain)
1805 tcf_chain0_head_change(chain, next);
1806 RCU_INIT_POINTER(*chain_info.pprev, next);
1807 mutex_unlock(&chain->filter_chain_lock);
1808
1809 tcf_proto_put(tp, rtnl_held, extack);
1810 }
1811
1812 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1813 struct tcf_chain_info *chain_info,
1814 u32 protocol, u32 prio,
1815 bool prio_allocate)
1816 {
1817 struct tcf_proto **pprev;
1818 struct tcf_proto *tp;
1819
1820 /* Check the chain for existence of proto-tcf with this priority */
1821 for (pprev = &chain->filter_chain;
1822 (tp = tcf_chain_dereference(*pprev, chain));
1823 pprev = &tp->next) {
1824 if (tp->prio >= prio) {
1825 if (tp->prio == prio) {
1826 if (prio_allocate ||
1827 (tp->protocol != protocol && protocol))
1828 return ERR_PTR(-EINVAL);
1829 } else {
1830 tp = NULL;
1831 }
1832 break;
1833 }
1834 }
1835 chain_info->pprev = pprev;
1836 if (tp) {
1837 chain_info->next = tp->next;
1838 tcf_proto_get(tp);
1839 } else {
1840 chain_info->next = NULL;
1841 }
1842 return tp;
1843 }
1844
1845 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1846 struct tcf_proto *tp, struct tcf_block *block,
1847 struct Qdisc *q, u32 parent, void *fh,
1848 u32 portid, u32 seq, u16 flags, int event,
1849 bool rtnl_held)
1850 {
1851 struct tcmsg *tcm;
1852 struct nlmsghdr *nlh;
1853 unsigned char *b = skb_tail_pointer(skb);
1854
1855 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1856 if (!nlh)
1857 goto out_nlmsg_trim;
1858 tcm = nlmsg_data(nlh);
1859 tcm->tcm_family = AF_UNSPEC;
1860 tcm->tcm__pad1 = 0;
1861 tcm->tcm__pad2 = 0;
1862 if (q) {
1863 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1864 tcm->tcm_parent = parent;
1865 } else {
1866 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1867 tcm->tcm_block_index = block->index;
1868 }
1869 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1870 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1871 goto nla_put_failure;
1872 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1873 goto nla_put_failure;
1874 if (!fh) {
1875 tcm->tcm_handle = 0;
1876 } else {
1877 if (tp->ops->dump &&
1878 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1879 goto nla_put_failure;
1880 }
1881 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1882 return skb->len;
1883
1884 out_nlmsg_trim:
1885 nla_put_failure:
1886 nlmsg_trim(skb, b);
1887 return -1;
1888 }
1889
1890 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1891 struct nlmsghdr *n, struct tcf_proto *tp,
1892 struct tcf_block *block, struct Qdisc *q,
1893 u32 parent, void *fh, int event, bool unicast,
1894 bool rtnl_held)
1895 {
1896 struct sk_buff *skb;
1897 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1898 int err = 0;
1899
1900 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1901 if (!skb)
1902 return -ENOBUFS;
1903
1904 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1905 n->nlmsg_seq, n->nlmsg_flags, event,
1906 rtnl_held) <= 0) {
1907 kfree_skb(skb);
1908 return -EINVAL;
1909 }
1910
1911 if (unicast)
1912 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1913 else
1914 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1915 n->nlmsg_flags & NLM_F_ECHO);
1916
1917 if (err > 0)
1918 err = 0;
1919 return err;
1920 }
1921
1922 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1923 struct nlmsghdr *n, struct tcf_proto *tp,
1924 struct tcf_block *block, struct Qdisc *q,
1925 u32 parent, void *fh, bool unicast, bool *last,
1926 bool rtnl_held, struct netlink_ext_ack *extack)
1927 {
1928 struct sk_buff *skb;
1929 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1930 int err;
1931
1932 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1933 if (!skb)
1934 return -ENOBUFS;
1935
1936 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1937 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1938 rtnl_held) <= 0) {
1939 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1940 kfree_skb(skb);
1941 return -EINVAL;
1942 }
1943
1944 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1945 if (err) {
1946 kfree_skb(skb);
1947 return err;
1948 }
1949
1950 if (unicast)
1951 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1952 else
1953 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1954 n->nlmsg_flags & NLM_F_ECHO);
1955 if (err < 0)
1956 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1957
1958 if (err > 0)
1959 err = 0;
1960 return err;
1961 }
1962
1963 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1964 struct tcf_block *block, struct Qdisc *q,
1965 u32 parent, struct nlmsghdr *n,
1966 struct tcf_chain *chain, int event,
1967 bool rtnl_held)
1968 {
1969 struct tcf_proto *tp;
1970
1971 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1972 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1973 tfilter_notify(net, oskb, n, tp, block,
1974 q, parent, NULL, event, false, rtnl_held);
1975 }
1976
1977 static void tfilter_put(struct tcf_proto *tp, void *fh)
1978 {
1979 if (tp->ops->put && fh)
1980 tp->ops->put(tp, fh);
1981 }
1982
1983 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1984 struct netlink_ext_ack *extack)
1985 {
1986 struct net *net = sock_net(skb->sk);
1987 struct nlattr *tca[TCA_MAX + 1];
1988 struct tcmsg *t;
1989 u32 protocol;
1990 u32 prio;
1991 bool prio_allocate;
1992 u32 parent;
1993 u32 chain_index;
1994 struct Qdisc *q = NULL;
1995 struct tcf_chain_info chain_info;
1996 struct tcf_chain *chain = NULL;
1997 struct tcf_block *block;
1998 struct tcf_proto *tp;
1999 unsigned long cl;
2000 void *fh;
2001 int err;
2002 int tp_created;
2003 bool rtnl_held = false;
2004
2005 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2006 return -EPERM;
2007
2008 replay:
2009 tp_created = 0;
2010
2011 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2012 rtm_tca_policy, extack);
2013 if (err < 0)
2014 return err;
2015
2016 t = nlmsg_data(n);
2017 protocol = TC_H_MIN(t->tcm_info);
2018 prio = TC_H_MAJ(t->tcm_info);
2019 prio_allocate = false;
2020 parent = t->tcm_parent;
2021 tp = NULL;
2022 cl = 0;
2023 block = NULL;
2024
2025 if (prio == 0) {
2026 /* If no priority is provided by the user,
2027 * we allocate one.
2028 */
2029 if (n->nlmsg_flags & NLM_F_CREATE) {
2030 prio = TC_H_MAKE(0x80000000U, 0U);
2031 prio_allocate = true;
2032 } else {
2033 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2034 return -ENOENT;
2035 }
2036 }
2037
2038 /* Find head of filter chain. */
2039
2040 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2041 if (err)
2042 return err;
2043
2044 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2045 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2046 * type is not specified, classifier is not unlocked.
2047 */
2048 if (rtnl_held ||
2049 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2050 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2051 rtnl_held = true;
2052 rtnl_lock();
2053 }
2054
2055 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2056 if (err)
2057 goto errout;
2058
2059 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2060 extack);
2061 if (IS_ERR(block)) {
2062 err = PTR_ERR(block);
2063 goto errout;
2064 }
2065
2066 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2067 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2068 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2069 err = -EINVAL;
2070 goto errout;
2071 }
2072 chain = tcf_chain_get(block, chain_index, true);
2073 if (!chain) {
2074 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2075 err = -ENOMEM;
2076 goto errout;
2077 }
2078
2079 mutex_lock(&chain->filter_chain_lock);
2080 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2081 prio, prio_allocate);
2082 if (IS_ERR(tp)) {
2083 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2084 err = PTR_ERR(tp);
2085 goto errout_locked;
2086 }
2087
2088 if (tp == NULL) {
2089 struct tcf_proto *tp_new = NULL;
2090
2091 if (chain->flushing) {
2092 err = -EAGAIN;
2093 goto errout_locked;
2094 }
2095
2096 /* Proto-tcf does not exist, create new one */
2097
2098 if (tca[TCA_KIND] == NULL || !protocol) {
2099 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2100 err = -EINVAL;
2101 goto errout_locked;
2102 }
2103
2104 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2105 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2106 err = -ENOENT;
2107 goto errout_locked;
2108 }
2109
2110 if (prio_allocate)
2111 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2112 &chain_info));
2113
2114 mutex_unlock(&chain->filter_chain_lock);
2115 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]),
2116 protocol, prio, chain, rtnl_held,
2117 extack);
2118 if (IS_ERR(tp_new)) {
2119 err = PTR_ERR(tp_new);
2120 goto errout_tp;
2121 }
2122
2123 tp_created = 1;
2124 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2125 rtnl_held);
2126 if (IS_ERR(tp)) {
2127 err = PTR_ERR(tp);
2128 goto errout_tp;
2129 }
2130 } else {
2131 mutex_unlock(&chain->filter_chain_lock);
2132 }
2133
2134 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2135 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2136 err = -EINVAL;
2137 goto errout;
2138 }
2139
2140 fh = tp->ops->get(tp, t->tcm_handle);
2141
2142 if (!fh) {
2143 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2144 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2145 err = -ENOENT;
2146 goto errout;
2147 }
2148 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2149 tfilter_put(tp, fh);
2150 NL_SET_ERR_MSG(extack, "Filter already exists");
2151 err = -EEXIST;
2152 goto errout;
2153 }
2154
2155 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2156 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2157 err = -EINVAL;
2158 goto errout;
2159 }
2160
2161 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2162 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2163 rtnl_held, extack);
2164 if (err == 0) {
2165 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2166 RTM_NEWTFILTER, false, rtnl_held);
2167 tfilter_put(tp, fh);
2168 }
2169
2170 errout:
2171 if (err && tp_created)
2172 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2173 errout_tp:
2174 if (chain) {
2175 if (tp && !IS_ERR(tp))
2176 tcf_proto_put(tp, rtnl_held, NULL);
2177 if (!tp_created)
2178 tcf_chain_put(chain);
2179 }
2180 tcf_block_release(q, block, rtnl_held);
2181
2182 if (rtnl_held)
2183 rtnl_unlock();
2184
2185 if (err == -EAGAIN) {
2186 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2187 * of target chain.
2188 */
2189 rtnl_held = true;
2190 /* Replay the request. */
2191 goto replay;
2192 }
2193 return err;
2194
2195 errout_locked:
2196 mutex_unlock(&chain->filter_chain_lock);
2197 goto errout;
2198 }
2199
2200 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2201 struct netlink_ext_ack *extack)
2202 {
2203 struct net *net = sock_net(skb->sk);
2204 struct nlattr *tca[TCA_MAX + 1];
2205 struct tcmsg *t;
2206 u32 protocol;
2207 u32 prio;
2208 u32 parent;
2209 u32 chain_index;
2210 struct Qdisc *q = NULL;
2211 struct tcf_chain_info chain_info;
2212 struct tcf_chain *chain = NULL;
2213 struct tcf_block *block = NULL;
2214 struct tcf_proto *tp = NULL;
2215 unsigned long cl = 0;
2216 void *fh = NULL;
2217 int err;
2218 bool rtnl_held = false;
2219
2220 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2221 return -EPERM;
2222
2223 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2224 rtm_tca_policy, extack);
2225 if (err < 0)
2226 return err;
2227
2228 t = nlmsg_data(n);
2229 protocol = TC_H_MIN(t->tcm_info);
2230 prio = TC_H_MAJ(t->tcm_info);
2231 parent = t->tcm_parent;
2232
2233 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2234 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2235 return -ENOENT;
2236 }
2237
2238 /* Find head of filter chain. */
2239
2240 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2241 if (err)
2242 return err;
2243
2244 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2245 * found), qdisc is not unlocked, classifier type is not specified,
2246 * classifier is not unlocked.
2247 */
2248 if (!prio ||
2249 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2250 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2251 rtnl_held = true;
2252 rtnl_lock();
2253 }
2254
2255 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2256 if (err)
2257 goto errout;
2258
2259 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2260 extack);
2261 if (IS_ERR(block)) {
2262 err = PTR_ERR(block);
2263 goto errout;
2264 }
2265
2266 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2267 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2268 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2269 err = -EINVAL;
2270 goto errout;
2271 }
2272 chain = tcf_chain_get(block, chain_index, false);
2273 if (!chain) {
2274 /* User requested flush on non-existent chain. Nothing to do,
2275 * so just return success.
2276 */
2277 if (prio == 0) {
2278 err = 0;
2279 goto errout;
2280 }
2281 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2282 err = -ENOENT;
2283 goto errout;
2284 }
2285
2286 if (prio == 0) {
2287 tfilter_notify_chain(net, skb, block, q, parent, n,
2288 chain, RTM_DELTFILTER, rtnl_held);
2289 tcf_chain_flush(chain, rtnl_held);
2290 err = 0;
2291 goto errout;
2292 }
2293
2294 mutex_lock(&chain->filter_chain_lock);
2295 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2296 prio, false);
2297 if (!tp || IS_ERR(tp)) {
2298 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2299 err = tp ? PTR_ERR(tp) : -ENOENT;
2300 goto errout_locked;
2301 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2302 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2303 err = -EINVAL;
2304 goto errout_locked;
2305 } else if (t->tcm_handle == 0) {
2306 tcf_chain_tp_remove(chain, &chain_info, tp);
2307 mutex_unlock(&chain->filter_chain_lock);
2308
2309 tcf_proto_put(tp, rtnl_held, NULL);
2310 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2311 RTM_DELTFILTER, false, rtnl_held);
2312 err = 0;
2313 goto errout;
2314 }
2315 mutex_unlock(&chain->filter_chain_lock);
2316
2317 fh = tp->ops->get(tp, t->tcm_handle);
2318
2319 if (!fh) {
2320 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2321 err = -ENOENT;
2322 } else {
2323 bool last;
2324
2325 err = tfilter_del_notify(net, skb, n, tp, block,
2326 q, parent, fh, false, &last,
2327 rtnl_held, extack);
2328
2329 if (err)
2330 goto errout;
2331 if (last)
2332 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2333 }
2334
2335 errout:
2336 if (chain) {
2337 if (tp && !IS_ERR(tp))
2338 tcf_proto_put(tp, rtnl_held, NULL);
2339 tcf_chain_put(chain);
2340 }
2341 tcf_block_release(q, block, rtnl_held);
2342
2343 if (rtnl_held)
2344 rtnl_unlock();
2345
2346 return err;
2347
2348 errout_locked:
2349 mutex_unlock(&chain->filter_chain_lock);
2350 goto errout;
2351 }
2352
2353 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2354 struct netlink_ext_ack *extack)
2355 {
2356 struct net *net = sock_net(skb->sk);
2357 struct nlattr *tca[TCA_MAX + 1];
2358 struct tcmsg *t;
2359 u32 protocol;
2360 u32 prio;
2361 u32 parent;
2362 u32 chain_index;
2363 struct Qdisc *q = NULL;
2364 struct tcf_chain_info chain_info;
2365 struct tcf_chain *chain = NULL;
2366 struct tcf_block *block = NULL;
2367 struct tcf_proto *tp = NULL;
2368 unsigned long cl = 0;
2369 void *fh = NULL;
2370 int err;
2371 bool rtnl_held = false;
2372
2373 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2374 rtm_tca_policy, extack);
2375 if (err < 0)
2376 return err;
2377
2378 t = nlmsg_data(n);
2379 protocol = TC_H_MIN(t->tcm_info);
2380 prio = TC_H_MAJ(t->tcm_info);
2381 parent = t->tcm_parent;
2382
2383 if (prio == 0) {
2384 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2385 return -ENOENT;
2386 }
2387
2388 /* Find head of filter chain. */
2389
2390 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2391 if (err)
2392 return err;
2393
2394 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2395 * unlocked, classifier type is not specified, classifier is not
2396 * unlocked.
2397 */
2398 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2399 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2400 rtnl_held = true;
2401 rtnl_lock();
2402 }
2403
2404 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2405 if (err)
2406 goto errout;
2407
2408 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2409 extack);
2410 if (IS_ERR(block)) {
2411 err = PTR_ERR(block);
2412 goto errout;
2413 }
2414
2415 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2416 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2417 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2418 err = -EINVAL;
2419 goto errout;
2420 }
2421 chain = tcf_chain_get(block, chain_index, false);
2422 if (!chain) {
2423 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2424 err = -EINVAL;
2425 goto errout;
2426 }
2427
2428 mutex_lock(&chain->filter_chain_lock);
2429 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2430 prio, false);
2431 mutex_unlock(&chain->filter_chain_lock);
2432 if (!tp || IS_ERR(tp)) {
2433 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2434 err = tp ? PTR_ERR(tp) : -ENOENT;
2435 goto errout;
2436 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2437 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2438 err = -EINVAL;
2439 goto errout;
2440 }
2441
2442 fh = tp->ops->get(tp, t->tcm_handle);
2443
2444 if (!fh) {
2445 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2446 err = -ENOENT;
2447 } else {
2448 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2449 fh, RTM_NEWTFILTER, true, rtnl_held);
2450 if (err < 0)
2451 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2452 }
2453
2454 tfilter_put(tp, fh);
2455 errout:
2456 if (chain) {
2457 if (tp && !IS_ERR(tp))
2458 tcf_proto_put(tp, rtnl_held, NULL);
2459 tcf_chain_put(chain);
2460 }
2461 tcf_block_release(q, block, rtnl_held);
2462
2463 if (rtnl_held)
2464 rtnl_unlock();
2465
2466 return err;
2467 }
2468
2469 struct tcf_dump_args {
2470 struct tcf_walker w;
2471 struct sk_buff *skb;
2472 struct netlink_callback *cb;
2473 struct tcf_block *block;
2474 struct Qdisc *q;
2475 u32 parent;
2476 };
2477
2478 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2479 {
2480 struct tcf_dump_args *a = (void *)arg;
2481 struct net *net = sock_net(a->skb->sk);
2482
2483 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2484 n, NETLINK_CB(a->cb->skb).portid,
2485 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2486 RTM_NEWTFILTER, true);
2487 }
2488
2489 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2490 struct sk_buff *skb, struct netlink_callback *cb,
2491 long index_start, long *p_index)
2492 {
2493 struct net *net = sock_net(skb->sk);
2494 struct tcf_block *block = chain->block;
2495 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2496 struct tcf_proto *tp, *tp_prev;
2497 struct tcf_dump_args arg;
2498
2499 for (tp = __tcf_get_next_proto(chain, NULL);
2500 tp;
2501 tp_prev = tp,
2502 tp = __tcf_get_next_proto(chain, tp),
2503 tcf_proto_put(tp_prev, true, NULL),
2504 (*p_index)++) {
2505 if (*p_index < index_start)
2506 continue;
2507 if (TC_H_MAJ(tcm->tcm_info) &&
2508 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2509 continue;
2510 if (TC_H_MIN(tcm->tcm_info) &&
2511 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2512 continue;
2513 if (*p_index > index_start)
2514 memset(&cb->args[1], 0,
2515 sizeof(cb->args) - sizeof(cb->args[0]));
2516 if (cb->args[1] == 0) {
2517 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2518 NETLINK_CB(cb->skb).portid,
2519 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2520 RTM_NEWTFILTER, true) <= 0)
2521 goto errout;
2522 cb->args[1] = 1;
2523 }
2524 if (!tp->ops->walk)
2525 continue;
2526 arg.w.fn = tcf_node_dump;
2527 arg.skb = skb;
2528 arg.cb = cb;
2529 arg.block = block;
2530 arg.q = q;
2531 arg.parent = parent;
2532 arg.w.stop = 0;
2533 arg.w.skip = cb->args[1] - 1;
2534 arg.w.count = 0;
2535 arg.w.cookie = cb->args[2];
2536 tp->ops->walk(tp, &arg.w, true);
2537 cb->args[2] = arg.w.cookie;
2538 cb->args[1] = arg.w.count + 1;
2539 if (arg.w.stop)
2540 goto errout;
2541 }
2542 return true;
2543
2544 errout:
2545 tcf_proto_put(tp, true, NULL);
2546 return false;
2547 }
2548
2549 /* called with RTNL */
2550 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2551 {
2552 struct tcf_chain *chain, *chain_prev;
2553 struct net *net = sock_net(skb->sk);
2554 struct nlattr *tca[TCA_MAX + 1];
2555 struct Qdisc *q = NULL;
2556 struct tcf_block *block;
2557 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2558 long index_start;
2559 long index;
2560 u32 parent;
2561 int err;
2562
2563 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2564 return skb->len;
2565
2566 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2567 NULL, cb->extack);
2568 if (err)
2569 return err;
2570
2571 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2572 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2573 if (!block)
2574 goto out;
2575 /* If we work with block index, q is NULL and parent value
2576 * will never be used in the following code. The check
2577 * in tcf_fill_node prevents it. However, compiler does not
2578 * see that far, so set parent to zero to silence the warning
2579 * about parent being uninitialized.
2580 */
2581 parent = 0;
2582 } else {
2583 const struct Qdisc_class_ops *cops;
2584 struct net_device *dev;
2585 unsigned long cl = 0;
2586
2587 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2588 if (!dev)
2589 return skb->len;
2590
2591 parent = tcm->tcm_parent;
2592 if (!parent) {
2593 q = dev->qdisc;
2594 parent = q->handle;
2595 } else {
2596 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2597 }
2598 if (!q)
2599 goto out;
2600 cops = q->ops->cl_ops;
2601 if (!cops)
2602 goto out;
2603 if (!cops->tcf_block)
2604 goto out;
2605 if (TC_H_MIN(tcm->tcm_parent)) {
2606 cl = cops->find(q, tcm->tcm_parent);
2607 if (cl == 0)
2608 goto out;
2609 }
2610 block = cops->tcf_block(q, cl, NULL);
2611 if (!block)
2612 goto out;
2613 if (tcf_block_shared(block))
2614 q = NULL;
2615 }
2616
2617 index_start = cb->args[0];
2618 index = 0;
2619
2620 for (chain = __tcf_get_next_chain(block, NULL);
2621 chain;
2622 chain_prev = chain,
2623 chain = __tcf_get_next_chain(block, chain),
2624 tcf_chain_put(chain_prev)) {
2625 if (tca[TCA_CHAIN] &&
2626 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2627 continue;
2628 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2629 index_start, &index)) {
2630 tcf_chain_put(chain);
2631 err = -EMSGSIZE;
2632 break;
2633 }
2634 }
2635
2636 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2637 tcf_block_refcnt_put(block, true);
2638 cb->args[0] = index;
2639
2640 out:
2641 /* If we did no progress, the error (EMSGSIZE) is real */
2642 if (skb->len == 0 && err)
2643 return err;
2644 return skb->len;
2645 }
2646
2647 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2648 void *tmplt_priv, u32 chain_index,
2649 struct net *net, struct sk_buff *skb,
2650 struct tcf_block *block,
2651 u32 portid, u32 seq, u16 flags, int event)
2652 {
2653 unsigned char *b = skb_tail_pointer(skb);
2654 const struct tcf_proto_ops *ops;
2655 struct nlmsghdr *nlh;
2656 struct tcmsg *tcm;
2657 void *priv;
2658
2659 ops = tmplt_ops;
2660 priv = tmplt_priv;
2661
2662 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2663 if (!nlh)
2664 goto out_nlmsg_trim;
2665 tcm = nlmsg_data(nlh);
2666 tcm->tcm_family = AF_UNSPEC;
2667 tcm->tcm__pad1 = 0;
2668 tcm->tcm__pad2 = 0;
2669 tcm->tcm_handle = 0;
2670 if (block->q) {
2671 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2672 tcm->tcm_parent = block->q->handle;
2673 } else {
2674 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2675 tcm->tcm_block_index = block->index;
2676 }
2677
2678 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2679 goto nla_put_failure;
2680
2681 if (ops) {
2682 if (nla_put_string(skb, TCA_KIND, ops->kind))
2683 goto nla_put_failure;
2684 if (ops->tmplt_dump(skb, net, priv) < 0)
2685 goto nla_put_failure;
2686 }
2687
2688 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2689 return skb->len;
2690
2691 out_nlmsg_trim:
2692 nla_put_failure:
2693 nlmsg_trim(skb, b);
2694 return -EMSGSIZE;
2695 }
2696
2697 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2698 u32 seq, u16 flags, int event, bool unicast)
2699 {
2700 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2701 struct tcf_block *block = chain->block;
2702 struct net *net = block->net;
2703 struct sk_buff *skb;
2704 int err = 0;
2705
2706 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2707 if (!skb)
2708 return -ENOBUFS;
2709
2710 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2711 chain->index, net, skb, block, portid,
2712 seq, flags, event) <= 0) {
2713 kfree_skb(skb);
2714 return -EINVAL;
2715 }
2716
2717 if (unicast)
2718 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2719 else
2720 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2721 flags & NLM_F_ECHO);
2722
2723 if (err > 0)
2724 err = 0;
2725 return err;
2726 }
2727
2728 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2729 void *tmplt_priv, u32 chain_index,
2730 struct tcf_block *block, struct sk_buff *oskb,
2731 u32 seq, u16 flags, bool unicast)
2732 {
2733 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2734 struct net *net = block->net;
2735 struct sk_buff *skb;
2736
2737 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2738 if (!skb)
2739 return -ENOBUFS;
2740
2741 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2742 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2743 kfree_skb(skb);
2744 return -EINVAL;
2745 }
2746
2747 if (unicast)
2748 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2749
2750 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2751 }
2752
2753 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2754 struct nlattr **tca,
2755 struct netlink_ext_ack *extack)
2756 {
2757 const struct tcf_proto_ops *ops;
2758 void *tmplt_priv;
2759
2760 /* If kind is not set, user did not specify template. */
2761 if (!tca[TCA_KIND])
2762 return 0;
2763
2764 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack);
2765 if (IS_ERR(ops))
2766 return PTR_ERR(ops);
2767 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2768 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2769 return -EOPNOTSUPP;
2770 }
2771
2772 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2773 if (IS_ERR(tmplt_priv)) {
2774 module_put(ops->owner);
2775 return PTR_ERR(tmplt_priv);
2776 }
2777 chain->tmplt_ops = ops;
2778 chain->tmplt_priv = tmplt_priv;
2779 return 0;
2780 }
2781
2782 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2783 void *tmplt_priv)
2784 {
2785 /* If template ops are set, no work to do for us. */
2786 if (!tmplt_ops)
2787 return;
2788
2789 tmplt_ops->tmplt_destroy(tmplt_priv);
2790 module_put(tmplt_ops->owner);
2791 }
2792
2793 /* Add/delete/get a chain */
2794
2795 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2796 struct netlink_ext_ack *extack)
2797 {
2798 struct net *net = sock_net(skb->sk);
2799 struct nlattr *tca[TCA_MAX + 1];
2800 struct tcmsg *t;
2801 u32 parent;
2802 u32 chain_index;
2803 struct Qdisc *q = NULL;
2804 struct tcf_chain *chain = NULL;
2805 struct tcf_block *block;
2806 unsigned long cl;
2807 int err;
2808
2809 if (n->nlmsg_type != RTM_GETCHAIN &&
2810 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2811 return -EPERM;
2812
2813 replay:
2814 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2815 rtm_tca_policy, extack);
2816 if (err < 0)
2817 return err;
2818
2819 t = nlmsg_data(n);
2820 parent = t->tcm_parent;
2821 cl = 0;
2822
2823 block = tcf_block_find(net, &q, &parent, &cl,
2824 t->tcm_ifindex, t->tcm_block_index, extack);
2825 if (IS_ERR(block))
2826 return PTR_ERR(block);
2827
2828 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2829 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2830 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2831 err = -EINVAL;
2832 goto errout_block;
2833 }
2834
2835 mutex_lock(&block->lock);
2836 chain = tcf_chain_lookup(block, chain_index);
2837 if (n->nlmsg_type == RTM_NEWCHAIN) {
2838 if (chain) {
2839 if (tcf_chain_held_by_acts_only(chain)) {
2840 /* The chain exists only because there is
2841 * some action referencing it.
2842 */
2843 tcf_chain_hold(chain);
2844 } else {
2845 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2846 err = -EEXIST;
2847 goto errout_block_locked;
2848 }
2849 } else {
2850 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2851 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2852 err = -ENOENT;
2853 goto errout_block_locked;
2854 }
2855 chain = tcf_chain_create(block, chain_index);
2856 if (!chain) {
2857 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2858 err = -ENOMEM;
2859 goto errout_block_locked;
2860 }
2861 }
2862 } else {
2863 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2864 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2865 err = -EINVAL;
2866 goto errout_block_locked;
2867 }
2868 tcf_chain_hold(chain);
2869 }
2870
2871 if (n->nlmsg_type == RTM_NEWCHAIN) {
2872 /* Modifying chain requires holding parent block lock. In case
2873 * the chain was successfully added, take a reference to the
2874 * chain. This ensures that an empty chain does not disappear at
2875 * the end of this function.
2876 */
2877 tcf_chain_hold(chain);
2878 chain->explicitly_created = true;
2879 }
2880 mutex_unlock(&block->lock);
2881
2882 switch (n->nlmsg_type) {
2883 case RTM_NEWCHAIN:
2884 err = tc_chain_tmplt_add(chain, net, tca, extack);
2885 if (err) {
2886 tcf_chain_put_explicitly_created(chain);
2887 goto errout;
2888 }
2889
2890 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2891 RTM_NEWCHAIN, false);
2892 break;
2893 case RTM_DELCHAIN:
2894 tfilter_notify_chain(net, skb, block, q, parent, n,
2895 chain, RTM_DELTFILTER, true);
2896 /* Flush the chain first as the user requested chain removal. */
2897 tcf_chain_flush(chain, true);
2898 /* In case the chain was successfully deleted, put a reference
2899 * to the chain previously taken during addition.
2900 */
2901 tcf_chain_put_explicitly_created(chain);
2902 break;
2903 case RTM_GETCHAIN:
2904 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2905 n->nlmsg_seq, n->nlmsg_type, true);
2906 if (err < 0)
2907 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2908 break;
2909 default:
2910 err = -EOPNOTSUPP;
2911 NL_SET_ERR_MSG(extack, "Unsupported message type");
2912 goto errout;
2913 }
2914
2915 errout:
2916 tcf_chain_put(chain);
2917 errout_block:
2918 tcf_block_release(q, block, true);
2919 if (err == -EAGAIN)
2920 /* Replay the request. */
2921 goto replay;
2922 return err;
2923
2924 errout_block_locked:
2925 mutex_unlock(&block->lock);
2926 goto errout_block;
2927 }
2928
2929 /* called with RTNL */
2930 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2931 {
2932 struct net *net = sock_net(skb->sk);
2933 struct nlattr *tca[TCA_MAX + 1];
2934 struct Qdisc *q = NULL;
2935 struct tcf_block *block;
2936 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2937 struct tcf_chain *chain;
2938 long index_start;
2939 long index;
2940 u32 parent;
2941 int err;
2942
2943 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2944 return skb->len;
2945
2946 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2947 rtm_tca_policy, cb->extack);
2948 if (err)
2949 return err;
2950
2951 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2952 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2953 if (!block)
2954 goto out;
2955 /* If we work with block index, q is NULL and parent value
2956 * will never be used in the following code. The check
2957 * in tcf_fill_node prevents it. However, compiler does not
2958 * see that far, so set parent to zero to silence the warning
2959 * about parent being uninitialized.
2960 */
2961 parent = 0;
2962 } else {
2963 const struct Qdisc_class_ops *cops;
2964 struct net_device *dev;
2965 unsigned long cl = 0;
2966
2967 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2968 if (!dev)
2969 return skb->len;
2970
2971 parent = tcm->tcm_parent;
2972 if (!parent) {
2973 q = dev->qdisc;
2974 parent = q->handle;
2975 } else {
2976 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2977 }
2978 if (!q)
2979 goto out;
2980 cops = q->ops->cl_ops;
2981 if (!cops)
2982 goto out;
2983 if (!cops->tcf_block)
2984 goto out;
2985 if (TC_H_MIN(tcm->tcm_parent)) {
2986 cl = cops->find(q, tcm->tcm_parent);
2987 if (cl == 0)
2988 goto out;
2989 }
2990 block = cops->tcf_block(q, cl, NULL);
2991 if (!block)
2992 goto out;
2993 if (tcf_block_shared(block))
2994 q = NULL;
2995 }
2996
2997 index_start = cb->args[0];
2998 index = 0;
2999
3000 mutex_lock(&block->lock);
3001 list_for_each_entry(chain, &block->chain_list, list) {
3002 if ((tca[TCA_CHAIN] &&
3003 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
3004 continue;
3005 if (index < index_start) {
3006 index++;
3007 continue;
3008 }
3009 if (tcf_chain_held_by_acts_only(chain))
3010 continue;
3011 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3012 chain->index, net, skb, block,
3013 NETLINK_CB(cb->skb).portid,
3014 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3015 RTM_NEWCHAIN);
3016 if (err <= 0)
3017 break;
3018 index++;
3019 }
3020 mutex_unlock(&block->lock);
3021
3022 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3023 tcf_block_refcnt_put(block, true);
3024 cb->args[0] = index;
3025
3026 out:
3027 /* If we did no progress, the error (EMSGSIZE) is real */
3028 if (skb->len == 0 && err)
3029 return err;
3030 return skb->len;
3031 }
3032
3033 void tcf_exts_destroy(struct tcf_exts *exts)
3034 {
3035 #ifdef CONFIG_NET_CLS_ACT
3036 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3037 kfree(exts->actions);
3038 exts->nr_actions = 0;
3039 #endif
3040 }
3041 EXPORT_SYMBOL(tcf_exts_destroy);
3042
3043 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3044 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3045 bool rtnl_held, struct netlink_ext_ack *extack)
3046 {
3047 #ifdef CONFIG_NET_CLS_ACT
3048 {
3049 struct tc_action *act;
3050 size_t attr_size = 0;
3051
3052 if (exts->police && tb[exts->police]) {
3053 act = tcf_action_init_1(net, tp, tb[exts->police],
3054 rate_tlv, "police", ovr,
3055 TCA_ACT_BIND, rtnl_held,
3056 extack);
3057 if (IS_ERR(act))
3058 return PTR_ERR(act);
3059
3060 act->type = exts->type = TCA_OLD_COMPAT;
3061 exts->actions[0] = act;
3062 exts->nr_actions = 1;
3063 } else if (exts->action && tb[exts->action]) {
3064 int err;
3065
3066 err = tcf_action_init(net, tp, tb[exts->action],
3067 rate_tlv, NULL, ovr, TCA_ACT_BIND,
3068 exts->actions, &attr_size,
3069 rtnl_held, extack);
3070 if (err < 0)
3071 return err;
3072 exts->nr_actions = err;
3073 }
3074 }
3075 #else
3076 if ((exts->action && tb[exts->action]) ||
3077 (exts->police && tb[exts->police])) {
3078 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3079 return -EOPNOTSUPP;
3080 }
3081 #endif
3082
3083 return 0;
3084 }
3085 EXPORT_SYMBOL(tcf_exts_validate);
3086
3087 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3088 {
3089 #ifdef CONFIG_NET_CLS_ACT
3090 struct tcf_exts old = *dst;
3091
3092 *dst = *src;
3093 tcf_exts_destroy(&old);
3094 #endif
3095 }
3096 EXPORT_SYMBOL(tcf_exts_change);
3097
3098 #ifdef CONFIG_NET_CLS_ACT
3099 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3100 {
3101 if (exts->nr_actions == 0)
3102 return NULL;
3103 else
3104 return exts->actions[0];
3105 }
3106 #endif
3107
3108 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3109 {
3110 #ifdef CONFIG_NET_CLS_ACT
3111 struct nlattr *nest;
3112
3113 if (exts->action && tcf_exts_has_actions(exts)) {
3114 /*
3115 * again for backward compatible mode - we want
3116 * to work with both old and new modes of entering
3117 * tc data even if iproute2 was newer - jhs
3118 */
3119 if (exts->type != TCA_OLD_COMPAT) {
3120 nest = nla_nest_start_noflag(skb, exts->action);
3121 if (nest == NULL)
3122 goto nla_put_failure;
3123
3124 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
3125 goto nla_put_failure;
3126 nla_nest_end(skb, nest);
3127 } else if (exts->police) {
3128 struct tc_action *act = tcf_exts_first_act(exts);
3129 nest = nla_nest_start_noflag(skb, exts->police);
3130 if (nest == NULL || !act)
3131 goto nla_put_failure;
3132 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3133 goto nla_put_failure;
3134 nla_nest_end(skb, nest);
3135 }
3136 }
3137 return 0;
3138
3139 nla_put_failure:
3140 nla_nest_cancel(skb, nest);
3141 return -1;
3142 #else
3143 return 0;
3144 #endif
3145 }
3146 EXPORT_SYMBOL(tcf_exts_dump);
3147
3148
3149 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3150 {
3151 #ifdef CONFIG_NET_CLS_ACT
3152 struct tc_action *a = tcf_exts_first_act(exts);
3153 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3154 return -1;
3155 #endif
3156 return 0;
3157 }
3158 EXPORT_SYMBOL(tcf_exts_dump_stats);
3159
3160 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3161 void *type_data, bool err_stop)
3162 {
3163 struct tcf_block_cb *block_cb;
3164 int ok_count = 0;
3165 int err;
3166
3167 /* Make sure all netdevs sharing this block are offload-capable. */
3168 if (block->nooffloaddevcnt && err_stop)
3169 return -EOPNOTSUPP;
3170
3171 list_for_each_entry(block_cb, &block->cb_list, list) {
3172 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3173 if (err) {
3174 if (err_stop)
3175 return err;
3176 } else {
3177 ok_count++;
3178 }
3179 }
3180 return ok_count;
3181 }
3182 EXPORT_SYMBOL(tc_setup_cb_call);
3183
3184 int tc_setup_flow_action(struct flow_action *flow_action,
3185 const struct tcf_exts *exts)
3186 {
3187 const struct tc_action *act;
3188 int i, j, k;
3189
3190 if (!exts)
3191 return 0;
3192
3193 j = 0;
3194 tcf_exts_for_each_action(i, act, exts) {
3195 struct flow_action_entry *entry;
3196
3197 entry = &flow_action->entries[j];
3198 if (is_tcf_gact_ok(act)) {
3199 entry->id = FLOW_ACTION_ACCEPT;
3200 } else if (is_tcf_gact_shot(act)) {
3201 entry->id = FLOW_ACTION_DROP;
3202 } else if (is_tcf_gact_trap(act)) {
3203 entry->id = FLOW_ACTION_TRAP;
3204 } else if (is_tcf_gact_goto_chain(act)) {
3205 entry->id = FLOW_ACTION_GOTO;
3206 entry->chain_index = tcf_gact_goto_chain_index(act);
3207 } else if (is_tcf_mirred_egress_redirect(act)) {
3208 entry->id = FLOW_ACTION_REDIRECT;
3209 entry->dev = tcf_mirred_dev(act);
3210 } else if (is_tcf_mirred_egress_mirror(act)) {
3211 entry->id = FLOW_ACTION_MIRRED;
3212 entry->dev = tcf_mirred_dev(act);
3213 } else if (is_tcf_vlan(act)) {
3214 switch (tcf_vlan_action(act)) {
3215 case TCA_VLAN_ACT_PUSH:
3216 entry->id = FLOW_ACTION_VLAN_PUSH;
3217 entry->vlan.vid = tcf_vlan_push_vid(act);
3218 entry->vlan.proto = tcf_vlan_push_proto(act);
3219 entry->vlan.prio = tcf_vlan_push_prio(act);
3220 break;
3221 case TCA_VLAN_ACT_POP:
3222 entry->id = FLOW_ACTION_VLAN_POP;
3223 break;
3224 case TCA_VLAN_ACT_MODIFY:
3225 entry->id = FLOW_ACTION_VLAN_MANGLE;
3226 entry->vlan.vid = tcf_vlan_push_vid(act);
3227 entry->vlan.proto = tcf_vlan_push_proto(act);
3228 entry->vlan.prio = tcf_vlan_push_prio(act);
3229 break;
3230 default:
3231 goto err_out;
3232 }
3233 } else if (is_tcf_tunnel_set(act)) {
3234 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3235 entry->tunnel = tcf_tunnel_info(act);
3236 } else if (is_tcf_tunnel_release(act)) {
3237 entry->id = FLOW_ACTION_TUNNEL_DECAP;
3238 } else if (is_tcf_pedit(act)) {
3239 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3240 switch (tcf_pedit_cmd(act, k)) {
3241 case TCA_PEDIT_KEY_EX_CMD_SET:
3242 entry->id = FLOW_ACTION_MANGLE;
3243 break;
3244 case TCA_PEDIT_KEY_EX_CMD_ADD:
3245 entry->id = FLOW_ACTION_ADD;
3246 break;
3247 default:
3248 goto err_out;
3249 }
3250 entry->mangle.htype = tcf_pedit_htype(act, k);
3251 entry->mangle.mask = tcf_pedit_mask(act, k);
3252 entry->mangle.val = tcf_pedit_val(act, k);
3253 entry->mangle.offset = tcf_pedit_offset(act, k);
3254 entry = &flow_action->entries[++j];
3255 }
3256 } else if (is_tcf_csum(act)) {
3257 entry->id = FLOW_ACTION_CSUM;
3258 entry->csum_flags = tcf_csum_update_flags(act);
3259 } else if (is_tcf_skbedit_mark(act)) {
3260 entry->id = FLOW_ACTION_MARK;
3261 entry->mark = tcf_skbedit_mark(act);
3262 } else if (is_tcf_sample(act)) {
3263 entry->id = FLOW_ACTION_SAMPLE;
3264 entry->sample.psample_group =
3265 tcf_sample_psample_group(act);
3266 entry->sample.trunc_size = tcf_sample_trunc_size(act);
3267 entry->sample.truncate = tcf_sample_truncate(act);
3268 entry->sample.rate = tcf_sample_rate(act);
3269 } else if (is_tcf_police(act)) {
3270 entry->id = FLOW_ACTION_POLICE;
3271 entry->police.burst = tcf_police_tcfp_burst(act);
3272 entry->police.rate_bytes_ps =
3273 tcf_police_rate_bytes_ps(act);
3274 } else {
3275 goto err_out;
3276 }
3277
3278 if (!is_tcf_pedit(act))
3279 j++;
3280 }
3281 return 0;
3282 err_out:
3283 return -EOPNOTSUPP;
3284 }
3285 EXPORT_SYMBOL(tc_setup_flow_action);
3286
3287 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3288 {
3289 unsigned int num_acts = 0;
3290 struct tc_action *act;
3291 int i;
3292
3293 tcf_exts_for_each_action(i, act, exts) {
3294 if (is_tcf_pedit(act))
3295 num_acts += tcf_pedit_nkeys(act);
3296 else
3297 num_acts++;
3298 }
3299 return num_acts;
3300 }
3301 EXPORT_SYMBOL(tcf_exts_num_actions);
3302
3303 static __net_init int tcf_net_init(struct net *net)
3304 {
3305 struct tcf_net *tn = net_generic(net, tcf_net_id);
3306
3307 spin_lock_init(&tn->idr_lock);
3308 idr_init(&tn->idr);
3309 return 0;
3310 }
3311
3312 static void __net_exit tcf_net_exit(struct net *net)
3313 {
3314 struct tcf_net *tn = net_generic(net, tcf_net_id);
3315
3316 idr_destroy(&tn->idr);
3317 }
3318
3319 static struct pernet_operations tcf_net_ops = {
3320 .init = tcf_net_init,
3321 .exit = tcf_net_exit,
3322 .id = &tcf_net_id,
3323 .size = sizeof(struct tcf_net),
3324 };
3325
3326 static int __init tc_filter_init(void)
3327 {
3328 int err;
3329
3330 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3331 if (!tc_filter_wq)
3332 return -ENOMEM;
3333
3334 err = register_pernet_subsys(&tcf_net_ops);
3335 if (err)
3336 goto err_register_pernet_subsys;
3337
3338 err = rhashtable_init(&indr_setup_block_ht,
3339 &tc_indr_setup_block_ht_params);
3340 if (err)
3341 goto err_rhash_setup_block_ht;
3342
3343 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3344 RTNL_FLAG_DOIT_UNLOCKED);
3345 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3346 RTNL_FLAG_DOIT_UNLOCKED);
3347 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3348 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3349 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3350 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3351 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3352 tc_dump_chain, 0);
3353
3354 return 0;
3355
3356 err_rhash_setup_block_ht:
3357 unregister_pernet_subsys(&tcf_net_ops);
3358 err_register_pernet_subsys:
3359 destroy_workqueue(tc_filter_wq);
3360 return err;
3361 }
3362
3363 subsys_initcall(tc_filter_init);
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