?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: erofs: integrate decompression inplace
[linux/fpc-iii.git] / net / sched / cls_api.c
blobad36bbcc583e2d8fc383ea74c8637061d6f91f18
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/cls_api.c Packet classifier API.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Changes:
8 *
9 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
10 */
11
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/kmod.h>
21 #include <linux/slab.h>
22 #include <linux/idr.h>
23 #include <linux/rhashtable.h>
24 #include <net/net_namespace.h>
25 #include <net/sock.h>
26 #include <net/netlink.h>
27 #include <net/pkt_sched.h>
28 #include <net/pkt_cls.h>
29 #include <net/tc_act/tc_pedit.h>
30 #include <net/tc_act/tc_mirred.h>
31 #include <net/tc_act/tc_vlan.h>
32 #include <net/tc_act/tc_tunnel_key.h>
33 #include <net/tc_act/tc_csum.h>
34 #include <net/tc_act/tc_gact.h>
35 #include <net/tc_act/tc_police.h>
36 #include <net/tc_act/tc_sample.h>
37 #include <net/tc_act/tc_skbedit.h>
38
39 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
40
41 /* The list of all installed classifier types */
42 static LIST_HEAD(tcf_proto_base);
43
44 /* Protects list of registered TC modules. It is pure SMP lock. */
45 static DEFINE_RWLOCK(cls_mod_lock);
46
47 /* Find classifier type by string name */
48
49 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
50 {
51 const struct tcf_proto_ops *t, *res = NULL;
52
53 if (kind) {
54 read_lock(&cls_mod_lock);
55 list_for_each_entry(t, &tcf_proto_base, head) {
56 if (strcmp(kind, t->kind) == 0) {
57 if (try_module_get(t->owner))
58 res = t;
59 break;
60 }
61 }
62 read_unlock(&cls_mod_lock);
63 }
64 return res;
65 }
66
67 static const struct tcf_proto_ops *
68 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
69 struct netlink_ext_ack *extack)
70 {
71 const struct tcf_proto_ops *ops;
72
73 ops = __tcf_proto_lookup_ops(kind);
74 if (ops)
75 return ops;
76 #ifdef CONFIG_MODULES
77 if (rtnl_held)
78 rtnl_unlock();
79 request_module("cls_%s", kind);
80 if (rtnl_held)
81 rtnl_lock();
82 ops = __tcf_proto_lookup_ops(kind);
83 /* We dropped the RTNL semaphore in order to perform
84 * the module load. So, even if we succeeded in loading
85 * the module we have to replay the request. We indicate
86 * this using -EAGAIN.
87 */
88 if (ops) {
89 module_put(ops->owner);
90 return ERR_PTR(-EAGAIN);
91 }
92 #endif
93 NL_SET_ERR_MSG(extack, "TC classifier not found");
94 return ERR_PTR(-ENOENT);
95 }
96
97 /* Register(unregister) new classifier type */
98
99 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
100 {
101 struct tcf_proto_ops *t;
102 int rc = -EEXIST;
103
104 write_lock(&cls_mod_lock);
105 list_for_each_entry(t, &tcf_proto_base, head)
106 if (!strcmp(ops->kind, t->kind))
107 goto out;
108
109 list_add_tail(&ops->head, &tcf_proto_base);
110 rc = 0;
111 out:
112 write_unlock(&cls_mod_lock);
113 return rc;
114 }
115 EXPORT_SYMBOL(register_tcf_proto_ops);
116
117 static struct workqueue_struct *tc_filter_wq;
118
119 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
120 {
121 struct tcf_proto_ops *t;
122 int rc = -ENOENT;
123
124 /* Wait for outstanding call_rcu()s, if any, from a
125 * tcf_proto_ops's destroy() handler.
126 */
127 rcu_barrier();
128 flush_workqueue(tc_filter_wq);
129
130 write_lock(&cls_mod_lock);
131 list_for_each_entry(t, &tcf_proto_base, head) {
132 if (t == ops) {
133 list_del(&t->head);
134 rc = 0;
135 break;
136 }
137 }
138 write_unlock(&cls_mod_lock);
139 return rc;
140 }
141 EXPORT_SYMBOL(unregister_tcf_proto_ops);
142
143 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
144 {
145 INIT_RCU_WORK(rwork, func);
146 return queue_rcu_work(tc_filter_wq, rwork);
147 }
148 EXPORT_SYMBOL(tcf_queue_work);
149
150 /* Select new prio value from the range, managed by kernel. */
151
152 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
153 {
154 u32 first = TC_H_MAKE(0xC0000000U, 0U);
155
156 if (tp)
157 first = tp->prio - 1;
158
159 return TC_H_MAJ(first);
160 }
161
162 static bool tcf_proto_is_unlocked(const char *kind)
163 {
164 const struct tcf_proto_ops *ops;
165 bool ret;
166
167 ops = tcf_proto_lookup_ops(kind, false, NULL);
168 /* On error return false to take rtnl lock. Proto lookup/create
169 * functions will perform lookup again and properly handle errors.
170 */
171 if (IS_ERR(ops))
172 return false;
173
174 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
175 module_put(ops->owner);
176 return ret;
177 }
178
179 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
180 u32 prio, struct tcf_chain *chain,
181 bool rtnl_held,
182 struct netlink_ext_ack *extack)
183 {
184 struct tcf_proto *tp;
185 int err;
186
187 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
188 if (!tp)
189 return ERR_PTR(-ENOBUFS);
190
191 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
192 if (IS_ERR(tp->ops)) {
193 err = PTR_ERR(tp->ops);
194 goto errout;
195 }
196 tp->classify = tp->ops->classify;
197 tp->protocol = protocol;
198 tp->prio = prio;
199 tp->chain = chain;
200 spin_lock_init(&tp->lock);
201 refcount_set(&tp->refcnt, 1);
202
203 err = tp->ops->init(tp);
204 if (err) {
205 module_put(tp->ops->owner);
206 goto errout;
207 }
208 return tp;
209
210 errout:
211 kfree(tp);
212 return ERR_PTR(err);
213 }
214
215 static void tcf_proto_get(struct tcf_proto *tp)
216 {
217 refcount_inc(&tp->refcnt);
218 }
219
220 static void tcf_chain_put(struct tcf_chain *chain);
221
222 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
223 struct netlink_ext_ack *extack)
224 {
225 tp->ops->destroy(tp, rtnl_held, extack);
226 tcf_chain_put(tp->chain);
227 module_put(tp->ops->owner);
228 kfree_rcu(tp, rcu);
229 }
230
231 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
232 struct netlink_ext_ack *extack)
233 {
234 if (refcount_dec_and_test(&tp->refcnt))
235 tcf_proto_destroy(tp, rtnl_held, extack);
236 }
237
238 static int walker_check_empty(struct tcf_proto *tp, void *fh,
239 struct tcf_walker *arg)
240 {
241 if (fh) {
242 arg->nonempty = true;
243 return -1;
244 }
245 return 0;
246 }
247
248 static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held)
249 {
250 struct tcf_walker walker = { .fn = walker_check_empty, };
251
252 if (tp->ops->walk) {
253 tp->ops->walk(tp, &walker, rtnl_held);
254 return !walker.nonempty;
255 }
256 return true;
257 }
258
259 static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held)
260 {
261 spin_lock(&tp->lock);
262 if (tcf_proto_is_empty(tp, rtnl_held))
263 tp->deleting = true;
264 spin_unlock(&tp->lock);
265 return tp->deleting;
266 }
267
268 static void tcf_proto_mark_delete(struct tcf_proto *tp)
269 {
270 spin_lock(&tp->lock);
271 tp->deleting = true;
272 spin_unlock(&tp->lock);
273 }
274
275 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
276 {
277 bool deleting;
278
279 spin_lock(&tp->lock);
280 deleting = tp->deleting;
281 spin_unlock(&tp->lock);
282
283 return deleting;
284 }
285
286 #define ASSERT_BLOCK_LOCKED(block) \
287 lockdep_assert_held(&(block)->lock)
288
289 struct tcf_filter_chain_list_item {
290 struct list_head list;
291 tcf_chain_head_change_t *chain_head_change;
292 void *chain_head_change_priv;
293 };
294
295 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
296 u32 chain_index)
297 {
298 struct tcf_chain *chain;
299
300 ASSERT_BLOCK_LOCKED(block);
301
302 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
303 if (!chain)
304 return NULL;
305 list_add_tail(&chain->list, &block->chain_list);
306 mutex_init(&chain->filter_chain_lock);
307 chain->block = block;
308 chain->index = chain_index;
309 chain->refcnt = 1;
310 if (!chain->index)
311 block->chain0.chain = chain;
312 return chain;
313 }
314
315 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
316 struct tcf_proto *tp_head)
317 {
318 if (item->chain_head_change)
319 item->chain_head_change(tp_head, item->chain_head_change_priv);
320 }
321
322 static void tcf_chain0_head_change(struct tcf_chain *chain,
323 struct tcf_proto *tp_head)
324 {
325 struct tcf_filter_chain_list_item *item;
326 struct tcf_block *block = chain->block;
327
328 if (chain->index)
329 return;
330
331 mutex_lock(&block->lock);
332 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
333 tcf_chain_head_change_item(item, tp_head);
334 mutex_unlock(&block->lock);
335 }
336
337 /* Returns true if block can be safely freed. */
338
339 static bool tcf_chain_detach(struct tcf_chain *chain)
340 {
341 struct tcf_block *block = chain->block;
342
343 ASSERT_BLOCK_LOCKED(block);
344
345 list_del(&chain->list);
346 if (!chain->index)
347 block->chain0.chain = NULL;
348
349 if (list_empty(&block->chain_list) &&
350 refcount_read(&block->refcnt) == 0)
351 return true;
352
353 return false;
354 }
355
356 static void tcf_block_destroy(struct tcf_block *block)
357 {
358 mutex_destroy(&block->lock);
359 kfree_rcu(block, rcu);
360 }
361
362 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
363 {
364 struct tcf_block *block = chain->block;
365
366 mutex_destroy(&chain->filter_chain_lock);
367 kfree_rcu(chain, rcu);
368 if (free_block)
369 tcf_block_destroy(block);
370 }
371
372 static void tcf_chain_hold(struct tcf_chain *chain)
373 {
374 ASSERT_BLOCK_LOCKED(chain->block);
375
376 ++chain->refcnt;
377 }
378
379 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
380 {
381 ASSERT_BLOCK_LOCKED(chain->block);
382
383 /* In case all the references are action references, this
384 * chain should not be shown to the user.
385 */
386 return chain->refcnt == chain->action_refcnt;
387 }
388
389 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
390 u32 chain_index)
391 {
392 struct tcf_chain *chain;
393
394 ASSERT_BLOCK_LOCKED(block);
395
396 list_for_each_entry(chain, &block->chain_list, list) {
397 if (chain->index == chain_index)
398 return chain;
399 }
400 return NULL;
401 }
402
403 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
404 u32 seq, u16 flags, int event, bool unicast);
405
406 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
407 u32 chain_index, bool create,
408 bool by_act)
409 {
410 struct tcf_chain *chain = NULL;
411 bool is_first_reference;
412
413 mutex_lock(&block->lock);
414 chain = tcf_chain_lookup(block, chain_index);
415 if (chain) {
416 tcf_chain_hold(chain);
417 } else {
418 if (!create)
419 goto errout;
420 chain = tcf_chain_create(block, chain_index);
421 if (!chain)
422 goto errout;
423 }
424
425 if (by_act)
426 ++chain->action_refcnt;
427 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
428 mutex_unlock(&block->lock);
429
430 /* Send notification only in case we got the first
431 * non-action reference. Until then, the chain acts only as
432 * a placeholder for actions pointing to it and user ought
433 * not know about them.
434 */
435 if (is_first_reference && !by_act)
436 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
437 RTM_NEWCHAIN, false);
438
439 return chain;
440
441 errout:
442 mutex_unlock(&block->lock);
443 return chain;
444 }
445
446 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
447 bool create)
448 {
449 return __tcf_chain_get(block, chain_index, create, false);
450 }
451
452 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
453 {
454 return __tcf_chain_get(block, chain_index, true, true);
455 }
456 EXPORT_SYMBOL(tcf_chain_get_by_act);
457
458 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
459 void *tmplt_priv);
460 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
461 void *tmplt_priv, u32 chain_index,
462 struct tcf_block *block, struct sk_buff *oskb,
463 u32 seq, u16 flags, bool unicast);
464
465 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
466 bool explicitly_created)
467 {
468 struct tcf_block *block = chain->block;
469 const struct tcf_proto_ops *tmplt_ops;
470 bool free_block = false;
471 unsigned int refcnt;
472 void *tmplt_priv;
473
474 mutex_lock(&block->lock);
475 if (explicitly_created) {
476 if (!chain->explicitly_created) {
477 mutex_unlock(&block->lock);
478 return;
479 }
480 chain->explicitly_created = false;
481 }
482
483 if (by_act)
484 chain->action_refcnt--;
485
486 /* tc_chain_notify_delete can't be called while holding block lock.
487 * However, when block is unlocked chain can be changed concurrently, so
488 * save these to temporary variables.
489 */
490 refcnt = --chain->refcnt;
491 tmplt_ops = chain->tmplt_ops;
492 tmplt_priv = chain->tmplt_priv;
493
494 /* The last dropped non-action reference will trigger notification. */
495 if (refcnt - chain->action_refcnt == 0 && !by_act) {
496 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
497 block, NULL, 0, 0, false);
498 /* Last reference to chain, no need to lock. */
499 chain->flushing = false;
500 }
501
502 if (refcnt == 0)
503 free_block = tcf_chain_detach(chain);
504 mutex_unlock(&block->lock);
505
506 if (refcnt == 0) {
507 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
508 tcf_chain_destroy(chain, free_block);
509 }
510 }
511
512 static void tcf_chain_put(struct tcf_chain *chain)
513 {
514 __tcf_chain_put(chain, false, false);
515 }
516
517 void tcf_chain_put_by_act(struct tcf_chain *chain)
518 {
519 __tcf_chain_put(chain, true, false);
520 }
521 EXPORT_SYMBOL(tcf_chain_put_by_act);
522
523 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
524 {
525 __tcf_chain_put(chain, false, true);
526 }
527
528 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
529 {
530 struct tcf_proto *tp, *tp_next;
531
532 mutex_lock(&chain->filter_chain_lock);
533 tp = tcf_chain_dereference(chain->filter_chain, chain);
534 RCU_INIT_POINTER(chain->filter_chain, NULL);
535 tcf_chain0_head_change(chain, NULL);
536 chain->flushing = true;
537 mutex_unlock(&chain->filter_chain_lock);
538
539 while (tp) {
540 tp_next = rcu_dereference_protected(tp->next, 1);
541 tcf_proto_put(tp, rtnl_held, NULL);
542 tp = tp_next;
543 }
544 }
545
546 static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
547 {
548 const struct Qdisc_class_ops *cops;
549 struct Qdisc *qdisc;
550
551 if (!dev_ingress_queue(dev))
552 return NULL;
553
554 qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
555 if (!qdisc)
556 return NULL;
557
558 cops = qdisc->ops->cl_ops;
559 if (!cops)
560 return NULL;
561
562 if (!cops->tcf_block)
563 return NULL;
564
565 return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
566 }
567
568 static struct rhashtable indr_setup_block_ht;
569
570 struct tc_indr_block_dev {
571 struct rhash_head ht_node;
572 struct net_device *dev;
573 unsigned int refcnt;
574 struct list_head cb_list;
575 struct tcf_block *block;
576 };
577
578 struct tc_indr_block_cb {
579 struct list_head list;
580 void *cb_priv;
581 tc_indr_block_bind_cb_t *cb;
582 void *cb_ident;
583 };
584
585 static const struct rhashtable_params tc_indr_setup_block_ht_params = {
586 .key_offset = offsetof(struct tc_indr_block_dev, dev),
587 .head_offset = offsetof(struct tc_indr_block_dev, ht_node),
588 .key_len = sizeof(struct net_device *),
589 };
590
591 static struct tc_indr_block_dev *
592 tc_indr_block_dev_lookup(struct net_device *dev)
593 {
594 return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
595 tc_indr_setup_block_ht_params);
596 }
597
598 static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev)
599 {
600 struct tc_indr_block_dev *indr_dev;
601
602 indr_dev = tc_indr_block_dev_lookup(dev);
603 if (indr_dev)
604 goto inc_ref;
605
606 indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
607 if (!indr_dev)
608 return NULL;
609
610 INIT_LIST_HEAD(&indr_dev->cb_list);
611 indr_dev->dev = dev;
612 indr_dev->block = tc_dev_ingress_block(dev);
613 if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
614 tc_indr_setup_block_ht_params)) {
615 kfree(indr_dev);
616 return NULL;
617 }
618
619 inc_ref:
620 indr_dev->refcnt++;
621 return indr_dev;
622 }
623
624 static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev)
625 {
626 if (--indr_dev->refcnt)
627 return;
628
629 rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
630 tc_indr_setup_block_ht_params);
631 kfree(indr_dev);
632 }
633
634 static struct tc_indr_block_cb *
635 tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev,
636 tc_indr_block_bind_cb_t *cb, void *cb_ident)
637 {
638 struct tc_indr_block_cb *indr_block_cb;
639
640 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
641 if (indr_block_cb->cb == cb &&
642 indr_block_cb->cb_ident == cb_ident)
643 return indr_block_cb;
644 return NULL;
645 }
646
647 static struct tc_indr_block_cb *
648 tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv,
649 tc_indr_block_bind_cb_t *cb, void *cb_ident)
650 {
651 struct tc_indr_block_cb *indr_block_cb;
652
653 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
654 if (indr_block_cb)
655 return ERR_PTR(-EEXIST);
656
657 indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
658 if (!indr_block_cb)
659 return ERR_PTR(-ENOMEM);
660
661 indr_block_cb->cb_priv = cb_priv;
662 indr_block_cb->cb = cb;
663 indr_block_cb->cb_ident = cb_ident;
664 list_add(&indr_block_cb->list, &indr_dev->cb_list);
665
666 return indr_block_cb;
667 }
668
669 static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb)
670 {
671 list_del(&indr_block_cb->list);
672 kfree(indr_block_cb);
673 }
674
675 static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev,
676 struct tc_indr_block_cb *indr_block_cb,
677 enum tc_block_command command)
678 {
679 struct tc_block_offload bo = {
680 .command = command,
681 .binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
682 .block = indr_dev->block,
683 };
684
685 if (!indr_dev->block)
686 return;
687
688 indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
689 &bo);
690 }
691
692 int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
693 tc_indr_block_bind_cb_t *cb, void *cb_ident)
694 {
695 struct tc_indr_block_cb *indr_block_cb;
696 struct tc_indr_block_dev *indr_dev;
697 int err;
698
699 indr_dev = tc_indr_block_dev_get(dev);
700 if (!indr_dev)
701 return -ENOMEM;
702
703 indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
704 err = PTR_ERR_OR_ZERO(indr_block_cb);
705 if (err)
706 goto err_dev_put;
707
708 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND);
709 return 0;
710
711 err_dev_put:
712 tc_indr_block_dev_put(indr_dev);
713 return err;
714 }
715 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register);
716
717 int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
718 tc_indr_block_bind_cb_t *cb, void *cb_ident)
719 {
720 int err;
721
722 rtnl_lock();
723 err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
724 rtnl_unlock();
725
726 return err;
727 }
728 EXPORT_SYMBOL_GPL(tc_indr_block_cb_register);
729
730 void __tc_indr_block_cb_unregister(struct net_device *dev,
731 tc_indr_block_bind_cb_t *cb, void *cb_ident)
732 {
733 struct tc_indr_block_cb *indr_block_cb;
734 struct tc_indr_block_dev *indr_dev;
735
736 indr_dev = tc_indr_block_dev_lookup(dev);
737 if (!indr_dev)
738 return;
739
740 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
741 if (!indr_block_cb)
742 return;
743
744 /* Send unbind message if required to free any block cbs. */
745 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND);
746 tc_indr_block_cb_del(indr_block_cb);
747 tc_indr_block_dev_put(indr_dev);
748 }
749 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister);
750
751 void tc_indr_block_cb_unregister(struct net_device *dev,
752 tc_indr_block_bind_cb_t *cb, void *cb_ident)
753 {
754 rtnl_lock();
755 __tc_indr_block_cb_unregister(dev, cb, cb_ident);
756 rtnl_unlock();
757 }
758 EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister);
759
760 static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
761 struct tcf_block_ext_info *ei,
762 enum tc_block_command command,
763 struct netlink_ext_ack *extack)
764 {
765 struct tc_indr_block_cb *indr_block_cb;
766 struct tc_indr_block_dev *indr_dev;
767 struct tc_block_offload bo = {
768 .command = command,
769 .binder_type = ei->binder_type,
770 .block = block,
771 .extack = extack,
772 };
773
774 indr_dev = tc_indr_block_dev_lookup(dev);
775 if (!indr_dev)
776 return;
777
778 indr_dev->block = command == TC_BLOCK_BIND ? block : NULL;
779
780 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
781 indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
782 &bo);
783 }
784
785 static bool tcf_block_offload_in_use(struct tcf_block *block)
786 {
787 return block->offloadcnt;
788 }
789
790 static int tcf_block_offload_cmd(struct tcf_block *block,
791 struct net_device *dev,
792 struct tcf_block_ext_info *ei,
793 enum tc_block_command command,
794 struct netlink_ext_ack *extack)
795 {
796 struct tc_block_offload bo = {};
797
798 bo.command = command;
799 bo.binder_type = ei->binder_type;
800 bo.block = block;
801 bo.extack = extack;
802 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
803 }
804
805 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
806 struct tcf_block_ext_info *ei,
807 struct netlink_ext_ack *extack)
808 {
809 struct net_device *dev = q->dev_queue->dev;
810 int err;
811
812 if (!dev->netdev_ops->ndo_setup_tc)
813 goto no_offload_dev_inc;
814
815 /* If tc offload feature is disabled and the block we try to bind
816 * to already has some offloaded filters, forbid to bind.
817 */
818 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
819 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
820 return -EOPNOTSUPP;
821 }
822
823 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
824 if (err == -EOPNOTSUPP)
825 goto no_offload_dev_inc;
826 if (err)
827 return err;
828
829 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
830 return 0;
831
832 no_offload_dev_inc:
833 if (tcf_block_offload_in_use(block))
834 return -EOPNOTSUPP;
835 block->nooffloaddevcnt++;
836 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
837 return 0;
838 }
839
840 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
841 struct tcf_block_ext_info *ei)
842 {
843 struct net_device *dev = q->dev_queue->dev;
844 int err;
845
846 tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL);
847
848 if (!dev->netdev_ops->ndo_setup_tc)
849 goto no_offload_dev_dec;
850 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
851 if (err == -EOPNOTSUPP)
852 goto no_offload_dev_dec;
853 return;
854
855 no_offload_dev_dec:
856 WARN_ON(block->nooffloaddevcnt-- == 0);
857 }
858
859 static int
860 tcf_chain0_head_change_cb_add(struct tcf_block *block,
861 struct tcf_block_ext_info *ei,
862 struct netlink_ext_ack *extack)
863 {
864 struct tcf_filter_chain_list_item *item;
865 struct tcf_chain *chain0;
866
867 item = kmalloc(sizeof(*item), GFP_KERNEL);
868 if (!item) {
869 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
870 return -ENOMEM;
871 }
872 item->chain_head_change = ei->chain_head_change;
873 item->chain_head_change_priv = ei->chain_head_change_priv;
874
875 mutex_lock(&block->lock);
876 chain0 = block->chain0.chain;
877 if (chain0)
878 tcf_chain_hold(chain0);
879 else
880 list_add(&item->list, &block->chain0.filter_chain_list);
881 mutex_unlock(&block->lock);
882
883 if (chain0) {
884 struct tcf_proto *tp_head;
885
886 mutex_lock(&chain0->filter_chain_lock);
887
888 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
889 if (tp_head)
890 tcf_chain_head_change_item(item, tp_head);
891
892 mutex_lock(&block->lock);
893 list_add(&item->list, &block->chain0.filter_chain_list);
894 mutex_unlock(&block->lock);
895
896 mutex_unlock(&chain0->filter_chain_lock);
897 tcf_chain_put(chain0);
898 }
899
900 return 0;
901 }
902
903 static void
904 tcf_chain0_head_change_cb_del(struct tcf_block *block,
905 struct tcf_block_ext_info *ei)
906 {
907 struct tcf_filter_chain_list_item *item;
908
909 mutex_lock(&block->lock);
910 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
911 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
912 (item->chain_head_change == ei->chain_head_change &&
913 item->chain_head_change_priv == ei->chain_head_change_priv)) {
914 if (block->chain0.chain)
915 tcf_chain_head_change_item(item, NULL);
916 list_del(&item->list);
917 mutex_unlock(&block->lock);
918
919 kfree(item);
920 return;
921 }
922 }
923 mutex_unlock(&block->lock);
924 WARN_ON(1);
925 }
926
927 struct tcf_net {
928 spinlock_t idr_lock; /* Protects idr */
929 struct idr idr;
930 };
931
932 static unsigned int tcf_net_id;
933
934 static int tcf_block_insert(struct tcf_block *block, struct net *net,
935 struct netlink_ext_ack *extack)
936 {
937 struct tcf_net *tn = net_generic(net, tcf_net_id);
938 int err;
939
940 idr_preload(GFP_KERNEL);
941 spin_lock(&tn->idr_lock);
942 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
943 GFP_NOWAIT);
944 spin_unlock(&tn->idr_lock);
945 idr_preload_end();
946
947 return err;
948 }
949
950 static void tcf_block_remove(struct tcf_block *block, struct net *net)
951 {
952 struct tcf_net *tn = net_generic(net, tcf_net_id);
953
954 spin_lock(&tn->idr_lock);
955 idr_remove(&tn->idr, block->index);
956 spin_unlock(&tn->idr_lock);
957 }
958
959 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
960 u32 block_index,
961 struct netlink_ext_ack *extack)
962 {
963 struct tcf_block *block;
964
965 block = kzalloc(sizeof(*block), GFP_KERNEL);
966 if (!block) {
967 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
968 return ERR_PTR(-ENOMEM);
969 }
970 mutex_init(&block->lock);
971 INIT_LIST_HEAD(&block->chain_list);
972 INIT_LIST_HEAD(&block->cb_list);
973 INIT_LIST_HEAD(&block->owner_list);
974 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
975
976 refcount_set(&block->refcnt, 1);
977 block->net = net;
978 block->index = block_index;
979
980 /* Don't store q pointer for blocks which are shared */
981 if (!tcf_block_shared(block))
982 block->q = q;
983 return block;
984 }
985
986 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
987 {
988 struct tcf_net *tn = net_generic(net, tcf_net_id);
989
990 return idr_find(&tn->idr, block_index);
991 }
992
993 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
994 {
995 struct tcf_block *block;
996
997 rcu_read_lock();
998 block = tcf_block_lookup(net, block_index);
999 if (block && !refcount_inc_not_zero(&block->refcnt))
1000 block = NULL;
1001 rcu_read_unlock();
1002
1003 return block;
1004 }
1005
1006 static struct tcf_chain *
1007 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1008 {
1009 mutex_lock(&block->lock);
1010 if (chain)
1011 chain = list_is_last(&chain->list, &block->chain_list) ?
1012 NULL : list_next_entry(chain, list);
1013 else
1014 chain = list_first_entry_or_null(&block->chain_list,
1015 struct tcf_chain, list);
1016
1017 /* skip all action-only chains */
1018 while (chain && tcf_chain_held_by_acts_only(chain))
1019 chain = list_is_last(&chain->list, &block->chain_list) ?
1020 NULL : list_next_entry(chain, list);
1021
1022 if (chain)
1023 tcf_chain_hold(chain);
1024 mutex_unlock(&block->lock);
1025
1026 return chain;
1027 }
1028
1029 /* Function to be used by all clients that want to iterate over all chains on
1030 * block. It properly obtains block->lock and takes reference to chain before
1031 * returning it. Users of this function must be tolerant to concurrent chain
1032 * insertion/deletion or ensure that no concurrent chain modification is
1033 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1034 * consistent dump because rtnl lock is released each time skb is filled with
1035 * data and sent to user-space.
1036 */
1037
1038 struct tcf_chain *
1039 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1040 {
1041 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1042
1043 if (chain)
1044 tcf_chain_put(chain);
1045
1046 return chain_next;
1047 }
1048 EXPORT_SYMBOL(tcf_get_next_chain);
1049
1050 static struct tcf_proto *
1051 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1052 {
1053 u32 prio = 0;
1054
1055 ASSERT_RTNL();
1056 mutex_lock(&chain->filter_chain_lock);
1057
1058 if (!tp) {
1059 tp = tcf_chain_dereference(chain->filter_chain, chain);
1060 } else if (tcf_proto_is_deleting(tp)) {
1061 /* 'deleting' flag is set and chain->filter_chain_lock was
1062 * unlocked, which means next pointer could be invalid. Restart
1063 * search.
1064 */
1065 prio = tp->prio + 1;
1066 tp = tcf_chain_dereference(chain->filter_chain, chain);
1067
1068 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1069 if (!tp->deleting && tp->prio >= prio)
1070 break;
1071 } else {
1072 tp = tcf_chain_dereference(tp->next, chain);
1073 }
1074
1075 if (tp)
1076 tcf_proto_get(tp);
1077
1078 mutex_unlock(&chain->filter_chain_lock);
1079
1080 return tp;
1081 }
1082
1083 /* Function to be used by all clients that want to iterate over all tp's on
1084 * chain. Users of this function must be tolerant to concurrent tp
1085 * insertion/deletion or ensure that no concurrent chain modification is
1086 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1087 * consistent dump because rtnl lock is released each time skb is filled with
1088 * data and sent to user-space.
1089 */
1090
1091 struct tcf_proto *
1092 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
1093 bool rtnl_held)
1094 {
1095 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1096
1097 if (tp)
1098 tcf_proto_put(tp, rtnl_held, NULL);
1099
1100 return tp_next;
1101 }
1102 EXPORT_SYMBOL(tcf_get_next_proto);
1103
1104 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1105 {
1106 struct tcf_chain *chain;
1107
1108 /* Last reference to block. At this point chains cannot be added or
1109 * removed concurrently.
1110 */
1111 for (chain = tcf_get_next_chain(block, NULL);
1112 chain;
1113 chain = tcf_get_next_chain(block, chain)) {
1114 tcf_chain_put_explicitly_created(chain);
1115 tcf_chain_flush(chain, rtnl_held);
1116 }
1117 }
1118
1119 /* Lookup Qdisc and increments its reference counter.
1120 * Set parent, if necessary.
1121 */
1122
1123 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1124 u32 *parent, int ifindex, bool rtnl_held,
1125 struct netlink_ext_ack *extack)
1126 {
1127 const struct Qdisc_class_ops *cops;
1128 struct net_device *dev;
1129 int err = 0;
1130
1131 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1132 return 0;
1133
1134 rcu_read_lock();
1135
1136 /* Find link */
1137 dev = dev_get_by_index_rcu(net, ifindex);
1138 if (!dev) {
1139 rcu_read_unlock();
1140 return -ENODEV;
1141 }
1142
1143 /* Find qdisc */
1144 if (!*parent) {
1145 *q = dev->qdisc;
1146 *parent = (*q)->handle;
1147 } else {
1148 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1149 if (!*q) {
1150 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1151 err = -EINVAL;
1152 goto errout_rcu;
1153 }
1154 }
1155
1156 *q = qdisc_refcount_inc_nz(*q);
1157 if (!*q) {
1158 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1159 err = -EINVAL;
1160 goto errout_rcu;
1161 }
1162
1163 /* Is it classful? */
1164 cops = (*q)->ops->cl_ops;
1165 if (!cops) {
1166 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1167 err = -EINVAL;
1168 goto errout_qdisc;
1169 }
1170
1171 if (!cops->tcf_block) {
1172 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1173 err = -EOPNOTSUPP;
1174 goto errout_qdisc;
1175 }
1176
1177 errout_rcu:
1178 /* At this point we know that qdisc is not noop_qdisc,
1179 * which means that qdisc holds a reference to net_device
1180 * and we hold a reference to qdisc, so it is safe to release
1181 * rcu read lock.
1182 */
1183 rcu_read_unlock();
1184 return err;
1185
1186 errout_qdisc:
1187 rcu_read_unlock();
1188
1189 if (rtnl_held)
1190 qdisc_put(*q);
1191 else
1192 qdisc_put_unlocked(*q);
1193 *q = NULL;
1194
1195 return err;
1196 }
1197
1198 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1199 int ifindex, struct netlink_ext_ack *extack)
1200 {
1201 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1202 return 0;
1203
1204 /* Do we search for filter, attached to class? */
1205 if (TC_H_MIN(parent)) {
1206 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1207
1208 *cl = cops->find(q, parent);
1209 if (*cl == 0) {
1210 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1211 return -ENOENT;
1212 }
1213 }
1214
1215 return 0;
1216 }
1217
1218 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1219 unsigned long cl, int ifindex,
1220 u32 block_index,
1221 struct netlink_ext_ack *extack)
1222 {
1223 struct tcf_block *block;
1224
1225 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1226 block = tcf_block_refcnt_get(net, block_index);
1227 if (!block) {
1228 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1229 return ERR_PTR(-EINVAL);
1230 }
1231 } else {
1232 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1233
1234 block = cops->tcf_block(q, cl, extack);
1235 if (!block)
1236 return ERR_PTR(-EINVAL);
1237
1238 if (tcf_block_shared(block)) {
1239 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1240 return ERR_PTR(-EOPNOTSUPP);
1241 }
1242
1243 /* Always take reference to block in order to support execution
1244 * of rules update path of cls API without rtnl lock. Caller
1245 * must release block when it is finished using it. 'if' block
1246 * of this conditional obtain reference to block by calling
1247 * tcf_block_refcnt_get().
1248 */
1249 refcount_inc(&block->refcnt);
1250 }
1251
1252 return block;
1253 }
1254
1255 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1256 struct tcf_block_ext_info *ei, bool rtnl_held)
1257 {
1258 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1259 /* Flushing/putting all chains will cause the block to be
1260 * deallocated when last chain is freed. However, if chain_list
1261 * is empty, block has to be manually deallocated. After block
1262 * reference counter reached 0, it is no longer possible to
1263 * increment it or add new chains to block.
1264 */
1265 bool free_block = list_empty(&block->chain_list);
1266
1267 mutex_unlock(&block->lock);
1268 if (tcf_block_shared(block))
1269 tcf_block_remove(block, block->net);
1270
1271 if (q)
1272 tcf_block_offload_unbind(block, q, ei);
1273
1274 if (free_block)
1275 tcf_block_destroy(block);
1276 else
1277 tcf_block_flush_all_chains(block, rtnl_held);
1278 } else if (q) {
1279 tcf_block_offload_unbind(block, q, ei);
1280 }
1281 }
1282
1283 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1284 {
1285 __tcf_block_put(block, NULL, NULL, rtnl_held);
1286 }
1287
1288 /* Find tcf block.
1289 * Set q, parent, cl when appropriate.
1290 */
1291
1292 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1293 u32 *parent, unsigned long *cl,
1294 int ifindex, u32 block_index,
1295 struct netlink_ext_ack *extack)
1296 {
1297 struct tcf_block *block;
1298 int err = 0;
1299
1300 ASSERT_RTNL();
1301
1302 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1303 if (err)
1304 goto errout;
1305
1306 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1307 if (err)
1308 goto errout_qdisc;
1309
1310 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1311 if (IS_ERR(block)) {
1312 err = PTR_ERR(block);
1313 goto errout_qdisc;
1314 }
1315
1316 return block;
1317
1318 errout_qdisc:
1319 if (*q)
1320 qdisc_put(*q);
1321 errout:
1322 *q = NULL;
1323 return ERR_PTR(err);
1324 }
1325
1326 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1327 bool rtnl_held)
1328 {
1329 if (!IS_ERR_OR_NULL(block))
1330 tcf_block_refcnt_put(block, rtnl_held);
1331
1332 if (q) {
1333 if (rtnl_held)
1334 qdisc_put(q);
1335 else
1336 qdisc_put_unlocked(q);
1337 }
1338 }
1339
1340 struct tcf_block_owner_item {
1341 struct list_head list;
1342 struct Qdisc *q;
1343 enum tcf_block_binder_type binder_type;
1344 };
1345
1346 static void
1347 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1348 struct Qdisc *q,
1349 enum tcf_block_binder_type binder_type)
1350 {
1351 if (block->keep_dst &&
1352 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1353 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1354 netif_keep_dst(qdisc_dev(q));
1355 }
1356
1357 void tcf_block_netif_keep_dst(struct tcf_block *block)
1358 {
1359 struct tcf_block_owner_item *item;
1360
1361 block->keep_dst = true;
1362 list_for_each_entry(item, &block->owner_list, list)
1363 tcf_block_owner_netif_keep_dst(block, item->q,
1364 item->binder_type);
1365 }
1366 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1367
1368 static int tcf_block_owner_add(struct tcf_block *block,
1369 struct Qdisc *q,
1370 enum tcf_block_binder_type binder_type)
1371 {
1372 struct tcf_block_owner_item *item;
1373
1374 item = kmalloc(sizeof(*item), GFP_KERNEL);
1375 if (!item)
1376 return -ENOMEM;
1377 item->q = q;
1378 item->binder_type = binder_type;
1379 list_add(&item->list, &block->owner_list);
1380 return 0;
1381 }
1382
1383 static void tcf_block_owner_del(struct tcf_block *block,
1384 struct Qdisc *q,
1385 enum tcf_block_binder_type binder_type)
1386 {
1387 struct tcf_block_owner_item *item;
1388
1389 list_for_each_entry(item, &block->owner_list, list) {
1390 if (item->q == q && item->binder_type == binder_type) {
1391 list_del(&item->list);
1392 kfree(item);
1393 return;
1394 }
1395 }
1396 WARN_ON(1);
1397 }
1398
1399 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1400 struct tcf_block_ext_info *ei,
1401 struct netlink_ext_ack *extack)
1402 {
1403 struct net *net = qdisc_net(q);
1404 struct tcf_block *block = NULL;
1405 int err;
1406
1407 if (ei->block_index)
1408 /* block_index not 0 means the shared block is requested */
1409 block = tcf_block_refcnt_get(net, ei->block_index);
1410
1411 if (!block) {
1412 block = tcf_block_create(net, q, ei->block_index, extack);
1413 if (IS_ERR(block))
1414 return PTR_ERR(block);
1415 if (tcf_block_shared(block)) {
1416 err = tcf_block_insert(block, net, extack);
1417 if (err)
1418 goto err_block_insert;
1419 }
1420 }
1421
1422 err = tcf_block_owner_add(block, q, ei->binder_type);
1423 if (err)
1424 goto err_block_owner_add;
1425
1426 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1427
1428 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1429 if (err)
1430 goto err_chain0_head_change_cb_add;
1431
1432 err = tcf_block_offload_bind(block, q, ei, extack);
1433 if (err)
1434 goto err_block_offload_bind;
1435
1436 *p_block = block;
1437 return 0;
1438
1439 err_block_offload_bind:
1440 tcf_chain0_head_change_cb_del(block, ei);
1441 err_chain0_head_change_cb_add:
1442 tcf_block_owner_del(block, q, ei->binder_type);
1443 err_block_owner_add:
1444 err_block_insert:
1445 tcf_block_refcnt_put(block, true);
1446 return err;
1447 }
1448 EXPORT_SYMBOL(tcf_block_get_ext);
1449
1450 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1451 {
1452 struct tcf_proto __rcu **p_filter_chain = priv;
1453
1454 rcu_assign_pointer(*p_filter_chain, tp_head);
1455 }
1456
1457 int tcf_block_get(struct tcf_block **p_block,
1458 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1459 struct netlink_ext_ack *extack)
1460 {
1461 struct tcf_block_ext_info ei = {
1462 .chain_head_change = tcf_chain_head_change_dflt,
1463 .chain_head_change_priv = p_filter_chain,
1464 };
1465
1466 WARN_ON(!p_filter_chain);
1467 return tcf_block_get_ext(p_block, q, &ei, extack);
1468 }
1469 EXPORT_SYMBOL(tcf_block_get);
1470
1471 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1472 * actions should be all removed after flushing.
1473 */
1474 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1475 struct tcf_block_ext_info *ei)
1476 {
1477 if (!block)
1478 return;
1479 tcf_chain0_head_change_cb_del(block, ei);
1480 tcf_block_owner_del(block, q, ei->binder_type);
1481
1482 __tcf_block_put(block, q, ei, true);
1483 }
1484 EXPORT_SYMBOL(tcf_block_put_ext);
1485
1486 void tcf_block_put(struct tcf_block *block)
1487 {
1488 struct tcf_block_ext_info ei = {0, };
1489
1490 if (!block)
1491 return;
1492 tcf_block_put_ext(block, block->q, &ei);
1493 }
1494
1495 EXPORT_SYMBOL(tcf_block_put);
1496
1497 struct tcf_block_cb {
1498 struct list_head list;
1499 tc_setup_cb_t *cb;
1500 void *cb_ident;
1501 void *cb_priv;
1502 unsigned int refcnt;
1503 };
1504
1505 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
1506 {
1507 return block_cb->cb_priv;
1508 }
1509 EXPORT_SYMBOL(tcf_block_cb_priv);
1510
1511 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
1512 tc_setup_cb_t *cb, void *cb_ident)
1513 { struct tcf_block_cb *block_cb;
1514
1515 list_for_each_entry(block_cb, &block->cb_list, list)
1516 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
1517 return block_cb;
1518 return NULL;
1519 }
1520 EXPORT_SYMBOL(tcf_block_cb_lookup);
1521
1522 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
1523 {
1524 block_cb->refcnt++;
1525 }
1526 EXPORT_SYMBOL(tcf_block_cb_incref);
1527
1528 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
1529 {
1530 return --block_cb->refcnt;
1531 }
1532 EXPORT_SYMBOL(tcf_block_cb_decref);
1533
1534 static int
1535 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
1536 void *cb_priv, bool add, bool offload_in_use,
1537 struct netlink_ext_ack *extack)
1538 {
1539 struct tcf_chain *chain, *chain_prev;
1540 struct tcf_proto *tp, *tp_prev;
1541 int err;
1542
1543 for (chain = __tcf_get_next_chain(block, NULL);
1544 chain;
1545 chain_prev = chain,
1546 chain = __tcf_get_next_chain(block, chain),
1547 tcf_chain_put(chain_prev)) {
1548 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1549 tp_prev = tp,
1550 tp = __tcf_get_next_proto(chain, tp),
1551 tcf_proto_put(tp_prev, true, NULL)) {
1552 if (tp->ops->reoffload) {
1553 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1554 extack);
1555 if (err && add)
1556 goto err_playback_remove;
1557 } else if (add && offload_in_use) {
1558 err = -EOPNOTSUPP;
1559 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1560 goto err_playback_remove;
1561 }
1562 }
1563 }
1564
1565 return 0;
1566
1567 err_playback_remove:
1568 tcf_proto_put(tp, true, NULL);
1569 tcf_chain_put(chain);
1570 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1571 extack);
1572 return err;
1573 }
1574
1575 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
1576 tc_setup_cb_t *cb, void *cb_ident,
1577 void *cb_priv,
1578 struct netlink_ext_ack *extack)
1579 {
1580 struct tcf_block_cb *block_cb;
1581 int err;
1582
1583 /* Replay any already present rules */
1584 err = tcf_block_playback_offloads(block, cb, cb_priv, true,
1585 tcf_block_offload_in_use(block),
1586 extack);
1587 if (err)
1588 return ERR_PTR(err);
1589
1590 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
1591 if (!block_cb)
1592 return ERR_PTR(-ENOMEM);
1593 block_cb->cb = cb;
1594 block_cb->cb_ident = cb_ident;
1595 block_cb->cb_priv = cb_priv;
1596 list_add(&block_cb->list, &block->cb_list);
1597 return block_cb;
1598 }
1599 EXPORT_SYMBOL(__tcf_block_cb_register);
1600
1601 int tcf_block_cb_register(struct tcf_block *block,
1602 tc_setup_cb_t *cb, void *cb_ident,
1603 void *cb_priv, struct netlink_ext_ack *extack)
1604 {
1605 struct tcf_block_cb *block_cb;
1606
1607 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
1608 extack);
1609 return PTR_ERR_OR_ZERO(block_cb);
1610 }
1611 EXPORT_SYMBOL(tcf_block_cb_register);
1612
1613 void __tcf_block_cb_unregister(struct tcf_block *block,
1614 struct tcf_block_cb *block_cb)
1615 {
1616 tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
1617 false, tcf_block_offload_in_use(block),
1618 NULL);
1619 list_del(&block_cb->list);
1620 kfree(block_cb);
1621 }
1622 EXPORT_SYMBOL(__tcf_block_cb_unregister);
1623
1624 void tcf_block_cb_unregister(struct tcf_block *block,
1625 tc_setup_cb_t *cb, void *cb_ident)
1626 {
1627 struct tcf_block_cb *block_cb;
1628
1629 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
1630 if (!block_cb)
1631 return;
1632 __tcf_block_cb_unregister(block, block_cb);
1633 }
1634 EXPORT_SYMBOL(tcf_block_cb_unregister);
1635
1636 /* Main classifier routine: scans classifier chain attached
1637 * to this qdisc, (optionally) tests for protocol and asks
1638 * specific classifiers.
1639 */
1640 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1641 struct tcf_result *res, bool compat_mode)
1642 {
1643 #ifdef CONFIG_NET_CLS_ACT
1644 const int max_reclassify_loop = 4;
1645 const struct tcf_proto *orig_tp = tp;
1646 const struct tcf_proto *first_tp;
1647 int limit = 0;
1648
1649 reclassify:
1650 #endif
1651 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1652 __be16 protocol = tc_skb_protocol(skb);
1653 int err;
1654
1655 if (tp->protocol != protocol &&
1656 tp->protocol != htons(ETH_P_ALL))
1657 continue;
1658
1659 err = tp->classify(skb, tp, res);
1660 #ifdef CONFIG_NET_CLS_ACT
1661 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1662 first_tp = orig_tp;
1663 goto reset;
1664 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1665 first_tp = res->goto_tp;
1666 goto reset;
1667 }
1668 #endif
1669 if (err >= 0)
1670 return err;
1671 }
1672
1673 return TC_ACT_UNSPEC; /* signal: continue lookup */
1674 #ifdef CONFIG_NET_CLS_ACT
1675 reset:
1676 if (unlikely(limit++ >= max_reclassify_loop)) {
1677 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1678 tp->chain->block->index,
1679 tp->prio & 0xffff,
1680 ntohs(tp->protocol));
1681 return TC_ACT_SHOT;
1682 }
1683
1684 tp = first_tp;
1685 goto reclassify;
1686 #endif
1687 }
1688 EXPORT_SYMBOL(tcf_classify);
1689
1690 struct tcf_chain_info {
1691 struct tcf_proto __rcu **pprev;
1692 struct tcf_proto __rcu *next;
1693 };
1694
1695 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1696 struct tcf_chain_info *chain_info)
1697 {
1698 return tcf_chain_dereference(*chain_info->pprev, chain);
1699 }
1700
1701 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1702 struct tcf_chain_info *chain_info,
1703 struct tcf_proto *tp)
1704 {
1705 if (chain->flushing)
1706 return -EAGAIN;
1707
1708 if (*chain_info->pprev == chain->filter_chain)
1709 tcf_chain0_head_change(chain, tp);
1710 tcf_proto_get(tp);
1711 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1712 rcu_assign_pointer(*chain_info->pprev, tp);
1713
1714 return 0;
1715 }
1716
1717 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1718 struct tcf_chain_info *chain_info,
1719 struct tcf_proto *tp)
1720 {
1721 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1722
1723 tcf_proto_mark_delete(tp);
1724 if (tp == chain->filter_chain)
1725 tcf_chain0_head_change(chain, next);
1726 RCU_INIT_POINTER(*chain_info->pprev, next);
1727 }
1728
1729 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1730 struct tcf_chain_info *chain_info,
1731 u32 protocol, u32 prio,
1732 bool prio_allocate);
1733
1734 /* Try to insert new proto.
1735 * If proto with specified priority already exists, free new proto
1736 * and return existing one.
1737 */
1738
1739 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1740 struct tcf_proto *tp_new,
1741 u32 protocol, u32 prio,
1742 bool rtnl_held)
1743 {
1744 struct tcf_chain_info chain_info;
1745 struct tcf_proto *tp;
1746 int err = 0;
1747
1748 mutex_lock(&chain->filter_chain_lock);
1749
1750 tp = tcf_chain_tp_find(chain, &chain_info,
1751 protocol, prio, false);
1752 if (!tp)
1753 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1754 mutex_unlock(&chain->filter_chain_lock);
1755
1756 if (tp) {
1757 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1758 tp_new = tp;
1759 } else if (err) {
1760 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1761 tp_new = ERR_PTR(err);
1762 }
1763
1764 return tp_new;
1765 }
1766
1767 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1768 struct tcf_proto *tp, bool rtnl_held,
1769 struct netlink_ext_ack *extack)
1770 {
1771 struct tcf_chain_info chain_info;
1772 struct tcf_proto *tp_iter;
1773 struct tcf_proto **pprev;
1774 struct tcf_proto *next;
1775
1776 mutex_lock(&chain->filter_chain_lock);
1777
1778 /* Atomically find and remove tp from chain. */
1779 for (pprev = &chain->filter_chain;
1780 (tp_iter = tcf_chain_dereference(*pprev, chain));
1781 pprev = &tp_iter->next) {
1782 if (tp_iter == tp) {
1783 chain_info.pprev = pprev;
1784 chain_info.next = tp_iter->next;
1785 WARN_ON(tp_iter->deleting);
1786 break;
1787 }
1788 }
1789 /* Verify that tp still exists and no new filters were inserted
1790 * concurrently.
1791 * Mark tp for deletion if it is empty.
1792 */
1793 if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) {
1794 mutex_unlock(&chain->filter_chain_lock);
1795 return;
1796 }
1797
1798 next = tcf_chain_dereference(chain_info.next, chain);
1799 if (tp == chain->filter_chain)
1800 tcf_chain0_head_change(chain, next);
1801 RCU_INIT_POINTER(*chain_info.pprev, next);
1802 mutex_unlock(&chain->filter_chain_lock);
1803
1804 tcf_proto_put(tp, rtnl_held, extack);
1805 }
1806
1807 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1808 struct tcf_chain_info *chain_info,
1809 u32 protocol, u32 prio,
1810 bool prio_allocate)
1811 {
1812 struct tcf_proto **pprev;
1813 struct tcf_proto *tp;
1814
1815 /* Check the chain for existence of proto-tcf with this priority */
1816 for (pprev = &chain->filter_chain;
1817 (tp = tcf_chain_dereference(*pprev, chain));
1818 pprev = &tp->next) {
1819 if (tp->prio >= prio) {
1820 if (tp->prio == prio) {
1821 if (prio_allocate ||
1822 (tp->protocol != protocol && protocol))
1823 return ERR_PTR(-EINVAL);
1824 } else {
1825 tp = NULL;
1826 }
1827 break;
1828 }
1829 }
1830 chain_info->pprev = pprev;
1831 if (tp) {
1832 chain_info->next = tp->next;
1833 tcf_proto_get(tp);
1834 } else {
1835 chain_info->next = NULL;
1836 }
1837 return tp;
1838 }
1839
1840 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1841 struct tcf_proto *tp, struct tcf_block *block,
1842 struct Qdisc *q, u32 parent, void *fh,
1843 u32 portid, u32 seq, u16 flags, int event,
1844 bool rtnl_held)
1845 {
1846 struct tcmsg *tcm;
1847 struct nlmsghdr *nlh;
1848 unsigned char *b = skb_tail_pointer(skb);
1849
1850 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1851 if (!nlh)
1852 goto out_nlmsg_trim;
1853 tcm = nlmsg_data(nlh);
1854 tcm->tcm_family = AF_UNSPEC;
1855 tcm->tcm__pad1 = 0;
1856 tcm->tcm__pad2 = 0;
1857 if (q) {
1858 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1859 tcm->tcm_parent = parent;
1860 } else {
1861 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1862 tcm->tcm_block_index = block->index;
1863 }
1864 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1865 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1866 goto nla_put_failure;
1867 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1868 goto nla_put_failure;
1869 if (!fh) {
1870 tcm->tcm_handle = 0;
1871 } else {
1872 if (tp->ops->dump &&
1873 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1874 goto nla_put_failure;
1875 }
1876 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1877 return skb->len;
1878
1879 out_nlmsg_trim:
1880 nla_put_failure:
1881 nlmsg_trim(skb, b);
1882 return -1;
1883 }
1884
1885 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1886 struct nlmsghdr *n, struct tcf_proto *tp,
1887 struct tcf_block *block, struct Qdisc *q,
1888 u32 parent, void *fh, int event, bool unicast,
1889 bool rtnl_held)
1890 {
1891 struct sk_buff *skb;
1892 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1893 int err = 0;
1894
1895 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1896 if (!skb)
1897 return -ENOBUFS;
1898
1899 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1900 n->nlmsg_seq, n->nlmsg_flags, event,
1901 rtnl_held) <= 0) {
1902 kfree_skb(skb);
1903 return -EINVAL;
1904 }
1905
1906 if (unicast)
1907 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1908 else
1909 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1910 n->nlmsg_flags & NLM_F_ECHO);
1911
1912 if (err > 0)
1913 err = 0;
1914 return err;
1915 }
1916
1917 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1918 struct nlmsghdr *n, struct tcf_proto *tp,
1919 struct tcf_block *block, struct Qdisc *q,
1920 u32 parent, void *fh, bool unicast, bool *last,
1921 bool rtnl_held, struct netlink_ext_ack *extack)
1922 {
1923 struct sk_buff *skb;
1924 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1925 int err;
1926
1927 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1928 if (!skb)
1929 return -ENOBUFS;
1930
1931 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1932 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1933 rtnl_held) <= 0) {
1934 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1935 kfree_skb(skb);
1936 return -EINVAL;
1937 }
1938
1939 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1940 if (err) {
1941 kfree_skb(skb);
1942 return err;
1943 }
1944
1945 if (unicast)
1946 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1947 else
1948 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1949 n->nlmsg_flags & NLM_F_ECHO);
1950 if (err < 0)
1951 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1952
1953 if (err > 0)
1954 err = 0;
1955 return err;
1956 }
1957
1958 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1959 struct tcf_block *block, struct Qdisc *q,
1960 u32 parent, struct nlmsghdr *n,
1961 struct tcf_chain *chain, int event,
1962 bool rtnl_held)
1963 {
1964 struct tcf_proto *tp;
1965
1966 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1967 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1968 tfilter_notify(net, oskb, n, tp, block,
1969 q, parent, NULL, event, false, rtnl_held);
1970 }
1971
1972 static void tfilter_put(struct tcf_proto *tp, void *fh)
1973 {
1974 if (tp->ops->put && fh)
1975 tp->ops->put(tp, fh);
1976 }
1977
1978 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1979 struct netlink_ext_ack *extack)
1980 {
1981 struct net *net = sock_net(skb->sk);
1982 struct nlattr *tca[TCA_MAX + 1];
1983 struct tcmsg *t;
1984 u32 protocol;
1985 u32 prio;
1986 bool prio_allocate;
1987 u32 parent;
1988 u32 chain_index;
1989 struct Qdisc *q = NULL;
1990 struct tcf_chain_info chain_info;
1991 struct tcf_chain *chain = NULL;
1992 struct tcf_block *block;
1993 struct tcf_proto *tp;
1994 unsigned long cl;
1995 void *fh;
1996 int err;
1997 int tp_created;
1998 bool rtnl_held = false;
1999
2000 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2001 return -EPERM;
2002
2003 replay:
2004 tp_created = 0;
2005
2006 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2007 rtm_tca_policy, extack);
2008 if (err < 0)
2009 return err;
2010
2011 t = nlmsg_data(n);
2012 protocol = TC_H_MIN(t->tcm_info);
2013 prio = TC_H_MAJ(t->tcm_info);
2014 prio_allocate = false;
2015 parent = t->tcm_parent;
2016 tp = NULL;
2017 cl = 0;
2018 block = NULL;
2019
2020 if (prio == 0) {
2021 /* If no priority is provided by the user,
2022 * we allocate one.
2023 */
2024 if (n->nlmsg_flags & NLM_F_CREATE) {
2025 prio = TC_H_MAKE(0x80000000U, 0U);
2026 prio_allocate = true;
2027 } else {
2028 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2029 return -ENOENT;
2030 }
2031 }
2032
2033 /* Find head of filter chain. */
2034
2035 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2036 if (err)
2037 return err;
2038
2039 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2040 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2041 * type is not specified, classifier is not unlocked.
2042 */
2043 if (rtnl_held ||
2044 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2045 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2046 rtnl_held = true;
2047 rtnl_lock();
2048 }
2049
2050 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2051 if (err)
2052 goto errout;
2053
2054 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2055 extack);
2056 if (IS_ERR(block)) {
2057 err = PTR_ERR(block);
2058 goto errout;
2059 }
2060
2061 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2062 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2063 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2064 err = -EINVAL;
2065 goto errout;
2066 }
2067 chain = tcf_chain_get(block, chain_index, true);
2068 if (!chain) {
2069 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2070 err = -ENOMEM;
2071 goto errout;
2072 }
2073
2074 mutex_lock(&chain->filter_chain_lock);
2075 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2076 prio, prio_allocate);
2077 if (IS_ERR(tp)) {
2078 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2079 err = PTR_ERR(tp);
2080 goto errout_locked;
2081 }
2082
2083 if (tp == NULL) {
2084 struct tcf_proto *tp_new = NULL;
2085
2086 if (chain->flushing) {
2087 err = -EAGAIN;
2088 goto errout_locked;
2089 }
2090
2091 /* Proto-tcf does not exist, create new one */
2092
2093 if (tca[TCA_KIND] == NULL || !protocol) {
2094 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2095 err = -EINVAL;
2096 goto errout_locked;
2097 }
2098
2099 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2100 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2101 err = -ENOENT;
2102 goto errout_locked;
2103 }
2104
2105 if (prio_allocate)
2106 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2107 &chain_info));
2108
2109 mutex_unlock(&chain->filter_chain_lock);
2110 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]),
2111 protocol, prio, chain, rtnl_held,
2112 extack);
2113 if (IS_ERR(tp_new)) {
2114 err = PTR_ERR(tp_new);
2115 goto errout_tp;
2116 }
2117
2118 tp_created = 1;
2119 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2120 rtnl_held);
2121 if (IS_ERR(tp)) {
2122 err = PTR_ERR(tp);
2123 goto errout_tp;
2124 }
2125 } else {
2126 mutex_unlock(&chain->filter_chain_lock);
2127 }
2128
2129 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2130 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2131 err = -EINVAL;
2132 goto errout;
2133 }
2134
2135 fh = tp->ops->get(tp, t->tcm_handle);
2136
2137 if (!fh) {
2138 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2139 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2140 err = -ENOENT;
2141 goto errout;
2142 }
2143 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2144 tfilter_put(tp, fh);
2145 NL_SET_ERR_MSG(extack, "Filter already exists");
2146 err = -EEXIST;
2147 goto errout;
2148 }
2149
2150 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2151 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2152 err = -EINVAL;
2153 goto errout;
2154 }
2155
2156 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2157 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2158 rtnl_held, extack);
2159 if (err == 0) {
2160 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2161 RTM_NEWTFILTER, false, rtnl_held);
2162 tfilter_put(tp, fh);
2163 }
2164
2165 errout:
2166 if (err && tp_created)
2167 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2168 errout_tp:
2169 if (chain) {
2170 if (tp && !IS_ERR(tp))
2171 tcf_proto_put(tp, rtnl_held, NULL);
2172 if (!tp_created)
2173 tcf_chain_put(chain);
2174 }
2175 tcf_block_release(q, block, rtnl_held);
2176
2177 if (rtnl_held)
2178 rtnl_unlock();
2179
2180 if (err == -EAGAIN) {
2181 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2182 * of target chain.
2183 */
2184 rtnl_held = true;
2185 /* Replay the request. */
2186 goto replay;
2187 }
2188 return err;
2189
2190 errout_locked:
2191 mutex_unlock(&chain->filter_chain_lock);
2192 goto errout;
2193 }
2194
2195 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2196 struct netlink_ext_ack *extack)
2197 {
2198 struct net *net = sock_net(skb->sk);
2199 struct nlattr *tca[TCA_MAX + 1];
2200 struct tcmsg *t;
2201 u32 protocol;
2202 u32 prio;
2203 u32 parent;
2204 u32 chain_index;
2205 struct Qdisc *q = NULL;
2206 struct tcf_chain_info chain_info;
2207 struct tcf_chain *chain = NULL;
2208 struct tcf_block *block = NULL;
2209 struct tcf_proto *tp = NULL;
2210 unsigned long cl = 0;
2211 void *fh = NULL;
2212 int err;
2213 bool rtnl_held = false;
2214
2215 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2216 return -EPERM;
2217
2218 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2219 rtm_tca_policy, extack);
2220 if (err < 0)
2221 return err;
2222
2223 t = nlmsg_data(n);
2224 protocol = TC_H_MIN(t->tcm_info);
2225 prio = TC_H_MAJ(t->tcm_info);
2226 parent = t->tcm_parent;
2227
2228 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2229 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2230 return -ENOENT;
2231 }
2232
2233 /* Find head of filter chain. */
2234
2235 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2236 if (err)
2237 return err;
2238
2239 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2240 * found), qdisc is not unlocked, classifier type is not specified,
2241 * classifier is not unlocked.
2242 */
2243 if (!prio ||
2244 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2245 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2246 rtnl_held = true;
2247 rtnl_lock();
2248 }
2249
2250 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2251 if (err)
2252 goto errout;
2253
2254 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2255 extack);
2256 if (IS_ERR(block)) {
2257 err = PTR_ERR(block);
2258 goto errout;
2259 }
2260
2261 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2262 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2263 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2264 err = -EINVAL;
2265 goto errout;
2266 }
2267 chain = tcf_chain_get(block, chain_index, false);
2268 if (!chain) {
2269 /* User requested flush on non-existent chain. Nothing to do,
2270 * so just return success.
2271 */
2272 if (prio == 0) {
2273 err = 0;
2274 goto errout;
2275 }
2276 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2277 err = -ENOENT;
2278 goto errout;
2279 }
2280
2281 if (prio == 0) {
2282 tfilter_notify_chain(net, skb, block, q, parent, n,
2283 chain, RTM_DELTFILTER, rtnl_held);
2284 tcf_chain_flush(chain, rtnl_held);
2285 err = 0;
2286 goto errout;
2287 }
2288
2289 mutex_lock(&chain->filter_chain_lock);
2290 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2291 prio, false);
2292 if (!tp || IS_ERR(tp)) {
2293 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2294 err = tp ? PTR_ERR(tp) : -ENOENT;
2295 goto errout_locked;
2296 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2297 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2298 err = -EINVAL;
2299 goto errout_locked;
2300 } else if (t->tcm_handle == 0) {
2301 tcf_chain_tp_remove(chain, &chain_info, tp);
2302 mutex_unlock(&chain->filter_chain_lock);
2303
2304 tcf_proto_put(tp, rtnl_held, NULL);
2305 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2306 RTM_DELTFILTER, false, rtnl_held);
2307 err = 0;
2308 goto errout;
2309 }
2310 mutex_unlock(&chain->filter_chain_lock);
2311
2312 fh = tp->ops->get(tp, t->tcm_handle);
2313
2314 if (!fh) {
2315 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2316 err = -ENOENT;
2317 } else {
2318 bool last;
2319
2320 err = tfilter_del_notify(net, skb, n, tp, block,
2321 q, parent, fh, false, &last,
2322 rtnl_held, extack);
2323
2324 if (err)
2325 goto errout;
2326 if (last)
2327 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2328 }
2329
2330 errout:
2331 if (chain) {
2332 if (tp && !IS_ERR(tp))
2333 tcf_proto_put(tp, rtnl_held, NULL);
2334 tcf_chain_put(chain);
2335 }
2336 tcf_block_release(q, block, rtnl_held);
2337
2338 if (rtnl_held)
2339 rtnl_unlock();
2340
2341 return err;
2342
2343 errout_locked:
2344 mutex_unlock(&chain->filter_chain_lock);
2345 goto errout;
2346 }
2347
2348 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2349 struct netlink_ext_ack *extack)
2350 {
2351 struct net *net = sock_net(skb->sk);
2352 struct nlattr *tca[TCA_MAX + 1];
2353 struct tcmsg *t;
2354 u32 protocol;
2355 u32 prio;
2356 u32 parent;
2357 u32 chain_index;
2358 struct Qdisc *q = NULL;
2359 struct tcf_chain_info chain_info;
2360 struct tcf_chain *chain = NULL;
2361 struct tcf_block *block = NULL;
2362 struct tcf_proto *tp = NULL;
2363 unsigned long cl = 0;
2364 void *fh = NULL;
2365 int err;
2366 bool rtnl_held = false;
2367
2368 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2369 rtm_tca_policy, extack);
2370 if (err < 0)
2371 return err;
2372
2373 t = nlmsg_data(n);
2374 protocol = TC_H_MIN(t->tcm_info);
2375 prio = TC_H_MAJ(t->tcm_info);
2376 parent = t->tcm_parent;
2377
2378 if (prio == 0) {
2379 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2380 return -ENOENT;
2381 }
2382
2383 /* Find head of filter chain. */
2384
2385 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2386 if (err)
2387 return err;
2388
2389 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2390 * unlocked, classifier type is not specified, classifier is not
2391 * unlocked.
2392 */
2393 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2394 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2395 rtnl_held = true;
2396 rtnl_lock();
2397 }
2398
2399 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2400 if (err)
2401 goto errout;
2402
2403 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2404 extack);
2405 if (IS_ERR(block)) {
2406 err = PTR_ERR(block);
2407 goto errout;
2408 }
2409
2410 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2411 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2412 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2413 err = -EINVAL;
2414 goto errout;
2415 }
2416 chain = tcf_chain_get(block, chain_index, false);
2417 if (!chain) {
2418 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2419 err = -EINVAL;
2420 goto errout;
2421 }
2422
2423 mutex_lock(&chain->filter_chain_lock);
2424 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2425 prio, false);
2426 mutex_unlock(&chain->filter_chain_lock);
2427 if (!tp || IS_ERR(tp)) {
2428 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2429 err = tp ? PTR_ERR(tp) : -ENOENT;
2430 goto errout;
2431 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2432 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2433 err = -EINVAL;
2434 goto errout;
2435 }
2436
2437 fh = tp->ops->get(tp, t->tcm_handle);
2438
2439 if (!fh) {
2440 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2441 err = -ENOENT;
2442 } else {
2443 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2444 fh, RTM_NEWTFILTER, true, rtnl_held);
2445 if (err < 0)
2446 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2447 }
2448
2449 tfilter_put(tp, fh);
2450 errout:
2451 if (chain) {
2452 if (tp && !IS_ERR(tp))
2453 tcf_proto_put(tp, rtnl_held, NULL);
2454 tcf_chain_put(chain);
2455 }
2456 tcf_block_release(q, block, rtnl_held);
2457
2458 if (rtnl_held)
2459 rtnl_unlock();
2460
2461 return err;
2462 }
2463
2464 struct tcf_dump_args {
2465 struct tcf_walker w;
2466 struct sk_buff *skb;
2467 struct netlink_callback *cb;
2468 struct tcf_block *block;
2469 struct Qdisc *q;
2470 u32 parent;
2471 };
2472
2473 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2474 {
2475 struct tcf_dump_args *a = (void *)arg;
2476 struct net *net = sock_net(a->skb->sk);
2477
2478 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2479 n, NETLINK_CB(a->cb->skb).portid,
2480 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2481 RTM_NEWTFILTER, true);
2482 }
2483
2484 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2485 struct sk_buff *skb, struct netlink_callback *cb,
2486 long index_start, long *p_index)
2487 {
2488 struct net *net = sock_net(skb->sk);
2489 struct tcf_block *block = chain->block;
2490 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2491 struct tcf_proto *tp, *tp_prev;
2492 struct tcf_dump_args arg;
2493
2494 for (tp = __tcf_get_next_proto(chain, NULL);
2495 tp;
2496 tp_prev = tp,
2497 tp = __tcf_get_next_proto(chain, tp),
2498 tcf_proto_put(tp_prev, true, NULL),
2499 (*p_index)++) {
2500 if (*p_index < index_start)
2501 continue;
2502 if (TC_H_MAJ(tcm->tcm_info) &&
2503 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2504 continue;
2505 if (TC_H_MIN(tcm->tcm_info) &&
2506 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2507 continue;
2508 if (*p_index > index_start)
2509 memset(&cb->args[1], 0,
2510 sizeof(cb->args) - sizeof(cb->args[0]));
2511 if (cb->args[1] == 0) {
2512 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2513 NETLINK_CB(cb->skb).portid,
2514 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2515 RTM_NEWTFILTER, true) <= 0)
2516 goto errout;
2517 cb->args[1] = 1;
2518 }
2519 if (!tp->ops->walk)
2520 continue;
2521 arg.w.fn = tcf_node_dump;
2522 arg.skb = skb;
2523 arg.cb = cb;
2524 arg.block = block;
2525 arg.q = q;
2526 arg.parent = parent;
2527 arg.w.stop = 0;
2528 arg.w.skip = cb->args[1] - 1;
2529 arg.w.count = 0;
2530 arg.w.cookie = cb->args[2];
2531 tp->ops->walk(tp, &arg.w, true);
2532 cb->args[2] = arg.w.cookie;
2533 cb->args[1] = arg.w.count + 1;
2534 if (arg.w.stop)
2535 goto errout;
2536 }
2537 return true;
2538
2539 errout:
2540 tcf_proto_put(tp, true, NULL);
2541 return false;
2542 }
2543
2544 /* called with RTNL */
2545 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2546 {
2547 struct tcf_chain *chain, *chain_prev;
2548 struct net *net = sock_net(skb->sk);
2549 struct nlattr *tca[TCA_MAX + 1];
2550 struct Qdisc *q = NULL;
2551 struct tcf_block *block;
2552 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2553 long index_start;
2554 long index;
2555 u32 parent;
2556 int err;
2557
2558 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2559 return skb->len;
2560
2561 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2562 NULL, cb->extack);
2563 if (err)
2564 return err;
2565
2566 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2567 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2568 if (!block)
2569 goto out;
2570 /* If we work with block index, q is NULL and parent value
2571 * will never be used in the following code. The check
2572 * in tcf_fill_node prevents it. However, compiler does not
2573 * see that far, so set parent to zero to silence the warning
2574 * about parent being uninitialized.
2575 */
2576 parent = 0;
2577 } else {
2578 const struct Qdisc_class_ops *cops;
2579 struct net_device *dev;
2580 unsigned long cl = 0;
2581
2582 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2583 if (!dev)
2584 return skb->len;
2585
2586 parent = tcm->tcm_parent;
2587 if (!parent) {
2588 q = dev->qdisc;
2589 parent = q->handle;
2590 } else {
2591 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2592 }
2593 if (!q)
2594 goto out;
2595 cops = q->ops->cl_ops;
2596 if (!cops)
2597 goto out;
2598 if (!cops->tcf_block)
2599 goto out;
2600 if (TC_H_MIN(tcm->tcm_parent)) {
2601 cl = cops->find(q, tcm->tcm_parent);
2602 if (cl == 0)
2603 goto out;
2604 }
2605 block = cops->tcf_block(q, cl, NULL);
2606 if (!block)
2607 goto out;
2608 if (tcf_block_shared(block))
2609 q = NULL;
2610 }
2611
2612 index_start = cb->args[0];
2613 index = 0;
2614
2615 for (chain = __tcf_get_next_chain(block, NULL);
2616 chain;
2617 chain_prev = chain,
2618 chain = __tcf_get_next_chain(block, chain),
2619 tcf_chain_put(chain_prev)) {
2620 if (tca[TCA_CHAIN] &&
2621 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2622 continue;
2623 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2624 index_start, &index)) {
2625 tcf_chain_put(chain);
2626 err = -EMSGSIZE;
2627 break;
2628 }
2629 }
2630
2631 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2632 tcf_block_refcnt_put(block, true);
2633 cb->args[0] = index;
2634
2635 out:
2636 /* If we did no progress, the error (EMSGSIZE) is real */
2637 if (skb->len == 0 && err)
2638 return err;
2639 return skb->len;
2640 }
2641
2642 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2643 void *tmplt_priv, u32 chain_index,
2644 struct net *net, struct sk_buff *skb,
2645 struct tcf_block *block,
2646 u32 portid, u32 seq, u16 flags, int event)
2647 {
2648 unsigned char *b = skb_tail_pointer(skb);
2649 const struct tcf_proto_ops *ops;
2650 struct nlmsghdr *nlh;
2651 struct tcmsg *tcm;
2652 void *priv;
2653
2654 ops = tmplt_ops;
2655 priv = tmplt_priv;
2656
2657 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2658 if (!nlh)
2659 goto out_nlmsg_trim;
2660 tcm = nlmsg_data(nlh);
2661 tcm->tcm_family = AF_UNSPEC;
2662 tcm->tcm__pad1 = 0;
2663 tcm->tcm__pad2 = 0;
2664 tcm->tcm_handle = 0;
2665 if (block->q) {
2666 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2667 tcm->tcm_parent = block->q->handle;
2668 } else {
2669 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2670 tcm->tcm_block_index = block->index;
2671 }
2672
2673 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2674 goto nla_put_failure;
2675
2676 if (ops) {
2677 if (nla_put_string(skb, TCA_KIND, ops->kind))
2678 goto nla_put_failure;
2679 if (ops->tmplt_dump(skb, net, priv) < 0)
2680 goto nla_put_failure;
2681 }
2682
2683 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2684 return skb->len;
2685
2686 out_nlmsg_trim:
2687 nla_put_failure:
2688 nlmsg_trim(skb, b);
2689 return -EMSGSIZE;
2690 }
2691
2692 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2693 u32 seq, u16 flags, int event, bool unicast)
2694 {
2695 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2696 struct tcf_block *block = chain->block;
2697 struct net *net = block->net;
2698 struct sk_buff *skb;
2699 int err = 0;
2700
2701 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2702 if (!skb)
2703 return -ENOBUFS;
2704
2705 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2706 chain->index, net, skb, block, portid,
2707 seq, flags, event) <= 0) {
2708 kfree_skb(skb);
2709 return -EINVAL;
2710 }
2711
2712 if (unicast)
2713 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2714 else
2715 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2716 flags & NLM_F_ECHO);
2717
2718 if (err > 0)
2719 err = 0;
2720 return err;
2721 }
2722
2723 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2724 void *tmplt_priv, u32 chain_index,
2725 struct tcf_block *block, struct sk_buff *oskb,
2726 u32 seq, u16 flags, bool unicast)
2727 {
2728 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2729 struct net *net = block->net;
2730 struct sk_buff *skb;
2731
2732 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2733 if (!skb)
2734 return -ENOBUFS;
2735
2736 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2737 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2738 kfree_skb(skb);
2739 return -EINVAL;
2740 }
2741
2742 if (unicast)
2743 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2744
2745 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2746 }
2747
2748 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2749 struct nlattr **tca,
2750 struct netlink_ext_ack *extack)
2751 {
2752 const struct tcf_proto_ops *ops;
2753 void *tmplt_priv;
2754
2755 /* If kind is not set, user did not specify template. */
2756 if (!tca[TCA_KIND])
2757 return 0;
2758
2759 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack);
2760 if (IS_ERR(ops))
2761 return PTR_ERR(ops);
2762 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2763 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2764 return -EOPNOTSUPP;
2765 }
2766
2767 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2768 if (IS_ERR(tmplt_priv)) {
2769 module_put(ops->owner);
2770 return PTR_ERR(tmplt_priv);
2771 }
2772 chain->tmplt_ops = ops;
2773 chain->tmplt_priv = tmplt_priv;
2774 return 0;
2775 }
2776
2777 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2778 void *tmplt_priv)
2779 {
2780 /* If template ops are set, no work to do for us. */
2781 if (!tmplt_ops)
2782 return;
2783
2784 tmplt_ops->tmplt_destroy(tmplt_priv);
2785 module_put(tmplt_ops->owner);
2786 }
2787
2788 /* Add/delete/get a chain */
2789
2790 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2791 struct netlink_ext_ack *extack)
2792 {
2793 struct net *net = sock_net(skb->sk);
2794 struct nlattr *tca[TCA_MAX + 1];
2795 struct tcmsg *t;
2796 u32 parent;
2797 u32 chain_index;
2798 struct Qdisc *q = NULL;
2799 struct tcf_chain *chain = NULL;
2800 struct tcf_block *block;
2801 unsigned long cl;
2802 int err;
2803
2804 if (n->nlmsg_type != RTM_GETCHAIN &&
2805 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2806 return -EPERM;
2807
2808 replay:
2809 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2810 rtm_tca_policy, extack);
2811 if (err < 0)
2812 return err;
2813
2814 t = nlmsg_data(n);
2815 parent = t->tcm_parent;
2816 cl = 0;
2817
2818 block = tcf_block_find(net, &q, &parent, &cl,
2819 t->tcm_ifindex, t->tcm_block_index, extack);
2820 if (IS_ERR(block))
2821 return PTR_ERR(block);
2822
2823 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2824 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2825 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2826 err = -EINVAL;
2827 goto errout_block;
2828 }
2829
2830 mutex_lock(&block->lock);
2831 chain = tcf_chain_lookup(block, chain_index);
2832 if (n->nlmsg_type == RTM_NEWCHAIN) {
2833 if (chain) {
2834 if (tcf_chain_held_by_acts_only(chain)) {
2835 /* The chain exists only because there is
2836 * some action referencing it.
2837 */
2838 tcf_chain_hold(chain);
2839 } else {
2840 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2841 err = -EEXIST;
2842 goto errout_block_locked;
2843 }
2844 } else {
2845 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2846 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2847 err = -ENOENT;
2848 goto errout_block_locked;
2849 }
2850 chain = tcf_chain_create(block, chain_index);
2851 if (!chain) {
2852 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2853 err = -ENOMEM;
2854 goto errout_block_locked;
2855 }
2856 }
2857 } else {
2858 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2859 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2860 err = -EINVAL;
2861 goto errout_block_locked;
2862 }
2863 tcf_chain_hold(chain);
2864 }
2865
2866 if (n->nlmsg_type == RTM_NEWCHAIN) {
2867 /* Modifying chain requires holding parent block lock. In case
2868 * the chain was successfully added, take a reference to the
2869 * chain. This ensures that an empty chain does not disappear at
2870 * the end of this function.
2871 */
2872 tcf_chain_hold(chain);
2873 chain->explicitly_created = true;
2874 }
2875 mutex_unlock(&block->lock);
2876
2877 switch (n->nlmsg_type) {
2878 case RTM_NEWCHAIN:
2879 err = tc_chain_tmplt_add(chain, net, tca, extack);
2880 if (err) {
2881 tcf_chain_put_explicitly_created(chain);
2882 goto errout;
2883 }
2884
2885 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2886 RTM_NEWCHAIN, false);
2887 break;
2888 case RTM_DELCHAIN:
2889 tfilter_notify_chain(net, skb, block, q, parent, n,
2890 chain, RTM_DELTFILTER, true);
2891 /* Flush the chain first as the user requested chain removal. */
2892 tcf_chain_flush(chain, true);
2893 /* In case the chain was successfully deleted, put a reference
2894 * to the chain previously taken during addition.
2895 */
2896 tcf_chain_put_explicitly_created(chain);
2897 break;
2898 case RTM_GETCHAIN:
2899 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2900 n->nlmsg_seq, n->nlmsg_type, true);
2901 if (err < 0)
2902 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2903 break;
2904 default:
2905 err = -EOPNOTSUPP;
2906 NL_SET_ERR_MSG(extack, "Unsupported message type");
2907 goto errout;
2908 }
2909
2910 errout:
2911 tcf_chain_put(chain);
2912 errout_block:
2913 tcf_block_release(q, block, true);
2914 if (err == -EAGAIN)
2915 /* Replay the request. */
2916 goto replay;
2917 return err;
2918
2919 errout_block_locked:
2920 mutex_unlock(&block->lock);
2921 goto errout_block;
2922 }
2923
2924 /* called with RTNL */
2925 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2926 {
2927 struct net *net = sock_net(skb->sk);
2928 struct nlattr *tca[TCA_MAX + 1];
2929 struct Qdisc *q = NULL;
2930 struct tcf_block *block;
2931 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2932 struct tcf_chain *chain;
2933 long index_start;
2934 long index;
2935 u32 parent;
2936 int err;
2937
2938 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2939 return skb->len;
2940
2941 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2942 rtm_tca_policy, cb->extack);
2943 if (err)
2944 return err;
2945
2946 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2947 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2948 if (!block)
2949 goto out;
2950 /* If we work with block index, q is NULL and parent value
2951 * will never be used in the following code. The check
2952 * in tcf_fill_node prevents it. However, compiler does not
2953 * see that far, so set parent to zero to silence the warning
2954 * about parent being uninitialized.
2955 */
2956 parent = 0;
2957 } else {
2958 const struct Qdisc_class_ops *cops;
2959 struct net_device *dev;
2960 unsigned long cl = 0;
2961
2962 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2963 if (!dev)
2964 return skb->len;
2965
2966 parent = tcm->tcm_parent;
2967 if (!parent) {
2968 q = dev->qdisc;
2969 parent = q->handle;
2970 } else {
2971 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2972 }
2973 if (!q)
2974 goto out;
2975 cops = q->ops->cl_ops;
2976 if (!cops)
2977 goto out;
2978 if (!cops->tcf_block)
2979 goto out;
2980 if (TC_H_MIN(tcm->tcm_parent)) {
2981 cl = cops->find(q, tcm->tcm_parent);
2982 if (cl == 0)
2983 goto out;
2984 }
2985 block = cops->tcf_block(q, cl, NULL);
2986 if (!block)
2987 goto out;
2988 if (tcf_block_shared(block))
2989 q = NULL;
2990 }
2991
2992 index_start = cb->args[0];
2993 index = 0;
2994
2995 mutex_lock(&block->lock);
2996 list_for_each_entry(chain, &block->chain_list, list) {
2997 if ((tca[TCA_CHAIN] &&
2998 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2999 continue;
3000 if (index < index_start) {
3001 index++;
3002 continue;
3003 }
3004 if (tcf_chain_held_by_acts_only(chain))
3005 continue;
3006 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3007 chain->index, net, skb, block,
3008 NETLINK_CB(cb->skb).portid,
3009 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3010 RTM_NEWCHAIN);
3011 if (err <= 0)
3012 break;
3013 index++;
3014 }
3015 mutex_unlock(&block->lock);
3016
3017 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3018 tcf_block_refcnt_put(block, true);
3019 cb->args[0] = index;
3020
3021 out:
3022 /* If we did no progress, the error (EMSGSIZE) is real */
3023 if (skb->len == 0 && err)
3024 return err;
3025 return skb->len;
3026 }
3027
3028 void tcf_exts_destroy(struct tcf_exts *exts)
3029 {
3030 #ifdef CONFIG_NET_CLS_ACT
3031 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3032 kfree(exts->actions);
3033 exts->nr_actions = 0;
3034 #endif
3035 }
3036 EXPORT_SYMBOL(tcf_exts_destroy);
3037
3038 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3039 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3040 bool rtnl_held, struct netlink_ext_ack *extack)
3041 {
3042 #ifdef CONFIG_NET_CLS_ACT
3043 {
3044 struct tc_action *act;
3045 size_t attr_size = 0;
3046
3047 if (exts->police && tb[exts->police]) {
3048 act = tcf_action_init_1(net, tp, tb[exts->police],
3049 rate_tlv, "police", ovr,
3050 TCA_ACT_BIND, rtnl_held,
3051 extack);
3052 if (IS_ERR(act))
3053 return PTR_ERR(act);
3054
3055 act->type = exts->type = TCA_OLD_COMPAT;
3056 exts->actions[0] = act;
3057 exts->nr_actions = 1;
3058 } else if (exts->action && tb[exts->action]) {
3059 int err;
3060
3061 err = tcf_action_init(net, tp, tb[exts->action],
3062 rate_tlv, NULL, ovr, TCA_ACT_BIND,
3063 exts->actions, &attr_size,
3064 rtnl_held, extack);
3065 if (err < 0)
3066 return err;
3067 exts->nr_actions = err;
3068 }
3069 }
3070 #else
3071 if ((exts->action && tb[exts->action]) ||
3072 (exts->police && tb[exts->police])) {
3073 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3074 return -EOPNOTSUPP;
3075 }
3076 #endif
3077
3078 return 0;
3079 }
3080 EXPORT_SYMBOL(tcf_exts_validate);
3081
3082 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3083 {
3084 #ifdef CONFIG_NET_CLS_ACT
3085 struct tcf_exts old = *dst;
3086
3087 *dst = *src;
3088 tcf_exts_destroy(&old);
3089 #endif
3090 }
3091 EXPORT_SYMBOL(tcf_exts_change);
3092
3093 #ifdef CONFIG_NET_CLS_ACT
3094 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3095 {
3096 if (exts->nr_actions == 0)
3097 return NULL;
3098 else
3099 return exts->actions[0];
3100 }
3101 #endif
3102
3103 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3104 {
3105 #ifdef CONFIG_NET_CLS_ACT
3106 struct nlattr *nest;
3107
3108 if (exts->action && tcf_exts_has_actions(exts)) {
3109 /*
3110 * again for backward compatible mode - we want
3111 * to work with both old and new modes of entering
3112 * tc data even if iproute2 was newer - jhs
3113 */
3114 if (exts->type != TCA_OLD_COMPAT) {
3115 nest = nla_nest_start_noflag(skb, exts->action);
3116 if (nest == NULL)
3117 goto nla_put_failure;
3118
3119 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
3120 goto nla_put_failure;
3121 nla_nest_end(skb, nest);
3122 } else if (exts->police) {
3123 struct tc_action *act = tcf_exts_first_act(exts);
3124 nest = nla_nest_start_noflag(skb, exts->police);
3125 if (nest == NULL || !act)
3126 goto nla_put_failure;
3127 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3128 goto nla_put_failure;
3129 nla_nest_end(skb, nest);
3130 }
3131 }
3132 return 0;
3133
3134 nla_put_failure:
3135 nla_nest_cancel(skb, nest);
3136 return -1;
3137 #else
3138 return 0;
3139 #endif
3140 }
3141 EXPORT_SYMBOL(tcf_exts_dump);
3142
3143
3144 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3145 {
3146 #ifdef CONFIG_NET_CLS_ACT
3147 struct tc_action *a = tcf_exts_first_act(exts);
3148 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3149 return -1;
3150 #endif
3151 return 0;
3152 }
3153 EXPORT_SYMBOL(tcf_exts_dump_stats);
3154
3155 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3156 void *type_data, bool err_stop)
3157 {
3158 struct tcf_block_cb *block_cb;
3159 int ok_count = 0;
3160 int err;
3161
3162 /* Make sure all netdevs sharing this block are offload-capable. */
3163 if (block->nooffloaddevcnt && err_stop)
3164 return -EOPNOTSUPP;
3165
3166 list_for_each_entry(block_cb, &block->cb_list, list) {
3167 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3168 if (err) {
3169 if (err_stop)
3170 return err;
3171 } else {
3172 ok_count++;
3173 }
3174 }
3175 return ok_count;
3176 }
3177 EXPORT_SYMBOL(tc_setup_cb_call);
3178
3179 int tc_setup_flow_action(struct flow_action *flow_action,
3180 const struct tcf_exts *exts)
3181 {
3182 const struct tc_action *act;
3183 int i, j, k;
3184
3185 if (!exts)
3186 return 0;
3187
3188 j = 0;
3189 tcf_exts_for_each_action(i, act, exts) {
3190 struct flow_action_entry *entry;
3191
3192 entry = &flow_action->entries[j];
3193 if (is_tcf_gact_ok(act)) {
3194 entry->id = FLOW_ACTION_ACCEPT;
3195 } else if (is_tcf_gact_shot(act)) {
3196 entry->id = FLOW_ACTION_DROP;
3197 } else if (is_tcf_gact_trap(act)) {
3198 entry->id = FLOW_ACTION_TRAP;
3199 } else if (is_tcf_gact_goto_chain(act)) {
3200 entry->id = FLOW_ACTION_GOTO;
3201 entry->chain_index = tcf_gact_goto_chain_index(act);
3202 } else if (is_tcf_mirred_egress_redirect(act)) {
3203 entry->id = FLOW_ACTION_REDIRECT;
3204 entry->dev = tcf_mirred_dev(act);
3205 } else if (is_tcf_mirred_egress_mirror(act)) {
3206 entry->id = FLOW_ACTION_MIRRED;
3207 entry->dev = tcf_mirred_dev(act);
3208 } else if (is_tcf_vlan(act)) {
3209 switch (tcf_vlan_action(act)) {
3210 case TCA_VLAN_ACT_PUSH:
3211 entry->id = FLOW_ACTION_VLAN_PUSH;
3212 entry->vlan.vid = tcf_vlan_push_vid(act);
3213 entry->vlan.proto = tcf_vlan_push_proto(act);
3214 entry->vlan.prio = tcf_vlan_push_prio(act);
3215 break;
3216 case TCA_VLAN_ACT_POP:
3217 entry->id = FLOW_ACTION_VLAN_POP;
3218 break;
3219 case TCA_VLAN_ACT_MODIFY:
3220 entry->id = FLOW_ACTION_VLAN_MANGLE;
3221 entry->vlan.vid = tcf_vlan_push_vid(act);
3222 entry->vlan.proto = tcf_vlan_push_proto(act);
3223 entry->vlan.prio = tcf_vlan_push_prio(act);
3224 break;
3225 default:
3226 goto err_out;
3227 }
3228 } else if (is_tcf_tunnel_set(act)) {
3229 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3230 entry->tunnel = tcf_tunnel_info(act);
3231 } else if (is_tcf_tunnel_release(act)) {
3232 entry->id = FLOW_ACTION_TUNNEL_DECAP;
3233 } else if (is_tcf_pedit(act)) {
3234 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3235 switch (tcf_pedit_cmd(act, k)) {
3236 case TCA_PEDIT_KEY_EX_CMD_SET:
3237 entry->id = FLOW_ACTION_MANGLE;
3238 break;
3239 case TCA_PEDIT_KEY_EX_CMD_ADD:
3240 entry->id = FLOW_ACTION_ADD;
3241 break;
3242 default:
3243 goto err_out;
3244 }
3245 entry->mangle.htype = tcf_pedit_htype(act, k);
3246 entry->mangle.mask = tcf_pedit_mask(act, k);
3247 entry->mangle.val = tcf_pedit_val(act, k);
3248 entry->mangle.offset = tcf_pedit_offset(act, k);
3249 entry = &flow_action->entries[++j];
3250 }
3251 } else if (is_tcf_csum(act)) {
3252 entry->id = FLOW_ACTION_CSUM;
3253 entry->csum_flags = tcf_csum_update_flags(act);
3254 } else if (is_tcf_skbedit_mark(act)) {
3255 entry->id = FLOW_ACTION_MARK;
3256 entry->mark = tcf_skbedit_mark(act);
3257 } else if (is_tcf_sample(act)) {
3258 entry->id = FLOW_ACTION_SAMPLE;
3259 entry->sample.psample_group =
3260 tcf_sample_psample_group(act);
3261 entry->sample.trunc_size = tcf_sample_trunc_size(act);
3262 entry->sample.truncate = tcf_sample_truncate(act);
3263 entry->sample.rate = tcf_sample_rate(act);
3264 } else if (is_tcf_police(act)) {
3265 entry->id = FLOW_ACTION_POLICE;
3266 entry->police.burst = tcf_police_tcfp_burst(act);
3267 entry->police.rate_bytes_ps =
3268 tcf_police_rate_bytes_ps(act);
3269 } else {
3270 goto err_out;
3271 }
3272
3273 if (!is_tcf_pedit(act))
3274 j++;
3275 }
3276 return 0;
3277 err_out:
3278 return -EOPNOTSUPP;
3279 }
3280 EXPORT_SYMBOL(tc_setup_flow_action);
3281
3282 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3283 {
3284 unsigned int num_acts = 0;
3285 struct tc_action *act;
3286 int i;
3287
3288 tcf_exts_for_each_action(i, act, exts) {
3289 if (is_tcf_pedit(act))
3290 num_acts += tcf_pedit_nkeys(act);
3291 else
3292 num_acts++;
3293 }
3294 return num_acts;
3295 }
3296 EXPORT_SYMBOL(tcf_exts_num_actions);
3297
3298 static __net_init int tcf_net_init(struct net *net)
3299 {
3300 struct tcf_net *tn = net_generic(net, tcf_net_id);
3301
3302 spin_lock_init(&tn->idr_lock);
3303 idr_init(&tn->idr);
3304 return 0;
3305 }
3306
3307 static void __net_exit tcf_net_exit(struct net *net)
3308 {
3309 struct tcf_net *tn = net_generic(net, tcf_net_id);
3310
3311 idr_destroy(&tn->idr);
3312 }
3313
3314 static struct pernet_operations tcf_net_ops = {
3315 .init = tcf_net_init,
3316 .exit = tcf_net_exit,
3317 .id = &tcf_net_id,
3318 .size = sizeof(struct tcf_net),
3319 };
3320
3321 static int __init tc_filter_init(void)
3322 {
3323 int err;
3324
3325 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3326 if (!tc_filter_wq)
3327 return -ENOMEM;
3328
3329 err = register_pernet_subsys(&tcf_net_ops);
3330 if (err)
3331 goto err_register_pernet_subsys;
3332
3333 err = rhashtable_init(&indr_setup_block_ht,
3334 &tc_indr_setup_block_ht_params);
3335 if (err)
3336 goto err_rhash_setup_block_ht;
3337
3338 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3339 RTNL_FLAG_DOIT_UNLOCKED);
3340 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3341 RTNL_FLAG_DOIT_UNLOCKED);
3342 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3343 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3344 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3345 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3346 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3347 tc_dump_chain, 0);
3348
3349 return 0;
3350
3351 err_rhash_setup_block_ht:
3352 unregister_pernet_subsys(&tcf_net_ops);
3353 err_register_pernet_subsys:
3354 destroy_workqueue(tc_filter_wq);
3355 return err;
3356 }
3357
3358 subsys_initcall(tc_filter_init);
Linux with added FPC-III support