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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 <linux/jhash.h>
25#include <net/net_namespace.h>
26#include <net/sock.h>
27#include <net/netlink.h>
28#include <net/pkt_sched.h>
29#include <net/pkt_cls.h>
30#include <net/tc_act/tc_pedit.h>
31#include <net/tc_act/tc_mirred.h>
32#include <net/tc_act/tc_vlan.h>
33#include <net/tc_act/tc_tunnel_key.h>
34#include <net/tc_act/tc_csum.h>
35#include <net/tc_act/tc_gact.h>
36#include <net/tc_act/tc_police.h>
37#include <net/tc_act/tc_sample.h>
38#include <net/tc_act/tc_skbedit.h>
39#include <net/tc_act/tc_ct.h>
40#include <net/tc_act/tc_mpls.h>
41#include <net/flow_offload.h>
42
43extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
44
45/* The list of all installed classifier types */
46static LIST_HEAD(tcf_proto_base);
47
48/* Protects list of registered TC modules. It is pure SMP lock. */
49static DEFINE_RWLOCK(cls_mod_lock);
50
51static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
52{
53 return jhash_3words(tp->chain->index, tp->prio,
54 (__force __u32)tp->protocol, 0);
55}
56
57static void tcf_proto_signal_destroying(struct tcf_chain *chain,
58 struct tcf_proto *tp)
59{
60 struct tcf_block *block = chain->block;
61
62 mutex_lock(&block->proto_destroy_lock);
63 hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
64 destroy_obj_hashfn(tp));
65 mutex_unlock(&block->proto_destroy_lock);
66}
67
68static bool tcf_proto_cmp(const struct tcf_proto *tp1,
69 const struct tcf_proto *tp2)
70{
71 return tp1->chain->index == tp2->chain->index &&
72 tp1->prio == tp2->prio &&
73 tp1->protocol == tp2->protocol;
74}
75
76static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
77 struct tcf_proto *tp)
78{
79 u32 hash = destroy_obj_hashfn(tp);
80 struct tcf_proto *iter;
81 bool found = false;
82
83 rcu_read_lock();
84 hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
85 destroy_ht_node, hash) {
86 if (tcf_proto_cmp(tp, iter)) {
87 found = true;
88 break;
89 }
90 }
91 rcu_read_unlock();
92
93 return found;
94}
95
96static void
97tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
98{
99 struct tcf_block *block = chain->block;
100
101 mutex_lock(&block->proto_destroy_lock);
102 if (hash_hashed(&tp->destroy_ht_node))
103 hash_del_rcu(&tp->destroy_ht_node);
104 mutex_unlock(&block->proto_destroy_lock);
105}
106
107/* Find classifier type by string name */
108
109static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
110{
111 const struct tcf_proto_ops *t, *res = NULL;
112
113 if (kind) {
114 read_lock(&cls_mod_lock);
115 list_for_each_entry(t, &tcf_proto_base, head) {
116 if (strcmp(kind, t->kind) == 0) {
117 if (try_module_get(t->owner))
118 res = t;
119 break;
120 }
121 }
122 read_unlock(&cls_mod_lock);
123 }
124 return res;
125}
126
127static const struct tcf_proto_ops *
128tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
129 struct netlink_ext_ack *extack)
130{
131 const struct tcf_proto_ops *ops;
132
133 ops = __tcf_proto_lookup_ops(kind);
134 if (ops)
135 return ops;
136#ifdef CONFIG_MODULES
137 if (rtnl_held)
138 rtnl_unlock();
139 request_module("cls_%s", kind);
140 if (rtnl_held)
141 rtnl_lock();
142 ops = __tcf_proto_lookup_ops(kind);
143 /* We dropped the RTNL semaphore in order to perform
144 * the module load. So, even if we succeeded in loading
145 * the module we have to replay the request. We indicate
146 * this using -EAGAIN.
147 */
148 if (ops) {
149 module_put(ops->owner);
150 return ERR_PTR(-EAGAIN);
151 }
152#endif
153 NL_SET_ERR_MSG(extack, "TC classifier not found");
154 return ERR_PTR(-ENOENT);
155}
156
157/* Register(unregister) new classifier type */
158
159int register_tcf_proto_ops(struct tcf_proto_ops *ops)
160{
161 struct tcf_proto_ops *t;
162 int rc = -EEXIST;
163
164 write_lock(&cls_mod_lock);
165 list_for_each_entry(t, &tcf_proto_base, head)
166 if (!strcmp(ops->kind, t->kind))
167 goto out;
168
169 list_add_tail(&ops->head, &tcf_proto_base);
170 rc = 0;
171out:
172 write_unlock(&cls_mod_lock);
173 return rc;
174}
175EXPORT_SYMBOL(register_tcf_proto_ops);
176
177static struct workqueue_struct *tc_filter_wq;
178
179int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
180{
181 struct tcf_proto_ops *t;
182 int rc = -ENOENT;
183
184 /* Wait for outstanding call_rcu()s, if any, from a
185 * tcf_proto_ops's destroy() handler.
186 */
187 rcu_barrier();
188 flush_workqueue(tc_filter_wq);
189
190 write_lock(&cls_mod_lock);
191 list_for_each_entry(t, &tcf_proto_base, head) {
192 if (t == ops) {
193 list_del(&t->head);
194 rc = 0;
195 break;
196 }
197 }
198 write_unlock(&cls_mod_lock);
199 return rc;
200}
201EXPORT_SYMBOL(unregister_tcf_proto_ops);
202
203bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
204{
205 INIT_RCU_WORK(rwork, func);
206 return queue_rcu_work(tc_filter_wq, rwork);
207}
208EXPORT_SYMBOL(tcf_queue_work);
209
210/* Select new prio value from the range, managed by kernel. */
211
212static inline u32 tcf_auto_prio(struct tcf_proto *tp)
213{
214 u32 first = TC_H_MAKE(0xC0000000U, 0U);
215
216 if (tp)
217 first = tp->prio - 1;
218
219 return TC_H_MAJ(first);
220}
221
222static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
223{
224 if (kind)
225 return nla_strlcpy(name, kind, IFNAMSIZ) >= IFNAMSIZ;
226 memset(name, 0, IFNAMSIZ);
227 return false;
228}
229
230static bool tcf_proto_is_unlocked(const char *kind)
231{
232 const struct tcf_proto_ops *ops;
233 bool ret;
234
235 if (strlen(kind) == 0)
236 return false;
237
238 ops = tcf_proto_lookup_ops(kind, false, NULL);
239 /* On error return false to take rtnl lock. Proto lookup/create
240 * functions will perform lookup again and properly handle errors.
241 */
242 if (IS_ERR(ops))
243 return false;
244
245 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
246 module_put(ops->owner);
247 return ret;
248}
249
250static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
251 u32 prio, struct tcf_chain *chain,
252 bool rtnl_held,
253 struct netlink_ext_ack *extack)
254{
255 struct tcf_proto *tp;
256 int err;
257
258 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
259 if (!tp)
260 return ERR_PTR(-ENOBUFS);
261
262 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
263 if (IS_ERR(tp->ops)) {
264 err = PTR_ERR(tp->ops);
265 goto errout;
266 }
267 tp->classify = tp->ops->classify;
268 tp->protocol = protocol;
269 tp->prio = prio;
270 tp->chain = chain;
271 spin_lock_init(&tp->lock);
272 refcount_set(&tp->refcnt, 1);
273
274 err = tp->ops->init(tp);
275 if (err) {
276 module_put(tp->ops->owner);
277 goto errout;
278 }
279 return tp;
280
281errout:
282 kfree(tp);
283 return ERR_PTR(err);
284}
285
286static void tcf_proto_get(struct tcf_proto *tp)
287{
288 refcount_inc(&tp->refcnt);
289}
290
291static void tcf_chain_put(struct tcf_chain *chain);
292
293static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
294 bool sig_destroy, struct netlink_ext_ack *extack)
295{
296 tp->ops->destroy(tp, rtnl_held, extack);
297 if (sig_destroy)
298 tcf_proto_signal_destroyed(tp->chain, tp);
299 tcf_chain_put(tp->chain);
300 module_put(tp->ops->owner);
301 kfree_rcu(tp, rcu);
302}
303
304static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
305 struct netlink_ext_ack *extack)
306{
307 if (refcount_dec_and_test(&tp->refcnt))
308 tcf_proto_destroy(tp, rtnl_held, true, extack);
309}
310
311static int walker_check_empty(struct tcf_proto *tp, void *fh,
312 struct tcf_walker *arg)
313{
314 if (fh) {
315 arg->nonempty = true;
316 return -1;
317 }
318 return 0;
319}
320
321static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held)
322{
323 struct tcf_walker walker = { .fn = walker_check_empty, };
324
325 if (tp->ops->walk) {
326 tp->ops->walk(tp, &walker, rtnl_held);
327 return !walker.nonempty;
328 }
329 return true;
330}
331
332static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held)
333{
334 spin_lock(&tp->lock);
335 if (tcf_proto_is_empty(tp, rtnl_held))
336 tp->deleting = true;
337 spin_unlock(&tp->lock);
338 return tp->deleting;
339}
340
341static void tcf_proto_mark_delete(struct tcf_proto *tp)
342{
343 spin_lock(&tp->lock);
344 tp->deleting = true;
345 spin_unlock(&tp->lock);
346}
347
348static bool tcf_proto_is_deleting(struct tcf_proto *tp)
349{
350 bool deleting;
351
352 spin_lock(&tp->lock);
353 deleting = tp->deleting;
354 spin_unlock(&tp->lock);
355
356 return deleting;
357}
358
359#define ASSERT_BLOCK_LOCKED(block) \
360 lockdep_assert_held(&(block)->lock)
361
362struct tcf_filter_chain_list_item {
363 struct list_head list;
364 tcf_chain_head_change_t *chain_head_change;
365 void *chain_head_change_priv;
366};
367
368static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
369 u32 chain_index)
370{
371 struct tcf_chain *chain;
372
373 ASSERT_BLOCK_LOCKED(block);
374
375 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
376 if (!chain)
377 return NULL;
378 list_add_tail(&chain->list, &block->chain_list);
379 mutex_init(&chain->filter_chain_lock);
380 chain->block = block;
381 chain->index = chain_index;
382 chain->refcnt = 1;
383 if (!chain->index)
384 block->chain0.chain = chain;
385 return chain;
386}
387
388static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
389 struct tcf_proto *tp_head)
390{
391 if (item->chain_head_change)
392 item->chain_head_change(tp_head, item->chain_head_change_priv);
393}
394
395static void tcf_chain0_head_change(struct tcf_chain *chain,
396 struct tcf_proto *tp_head)
397{
398 struct tcf_filter_chain_list_item *item;
399 struct tcf_block *block = chain->block;
400
401 if (chain->index)
402 return;
403
404 mutex_lock(&block->lock);
405 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
406 tcf_chain_head_change_item(item, tp_head);
407 mutex_unlock(&block->lock);
408}
409
410/* Returns true if block can be safely freed. */
411
412static bool tcf_chain_detach(struct tcf_chain *chain)
413{
414 struct tcf_block *block = chain->block;
415
416 ASSERT_BLOCK_LOCKED(block);
417
418 list_del(&chain->list);
419 if (!chain->index)
420 block->chain0.chain = NULL;
421
422 if (list_empty(&block->chain_list) &&
423 refcount_read(&block->refcnt) == 0)
424 return true;
425
426 return false;
427}
428
429static void tcf_block_destroy(struct tcf_block *block)
430{
431 mutex_destroy(&block->lock);
432 mutex_destroy(&block->proto_destroy_lock);
433 kfree_rcu(block, rcu);
434}
435
436static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
437{
438 struct tcf_block *block = chain->block;
439
440 mutex_destroy(&chain->filter_chain_lock);
441 kfree_rcu(chain, rcu);
442 if (free_block)
443 tcf_block_destroy(block);
444}
445
446static void tcf_chain_hold(struct tcf_chain *chain)
447{
448 ASSERT_BLOCK_LOCKED(chain->block);
449
450 ++chain->refcnt;
451}
452
453static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
454{
455 ASSERT_BLOCK_LOCKED(chain->block);
456
457 /* In case all the references are action references, this
458 * chain should not be shown to the user.
459 */
460 return chain->refcnt == chain->action_refcnt;
461}
462
463static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
464 u32 chain_index)
465{
466 struct tcf_chain *chain;
467
468 ASSERT_BLOCK_LOCKED(block);
469
470 list_for_each_entry(chain, &block->chain_list, list) {
471 if (chain->index == chain_index)
472 return chain;
473 }
474 return NULL;
475}
476
477static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
478 u32 seq, u16 flags, int event, bool unicast);
479
480static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
481 u32 chain_index, bool create,
482 bool by_act)
483{
484 struct tcf_chain *chain = NULL;
485 bool is_first_reference;
486
487 mutex_lock(&block->lock);
488 chain = tcf_chain_lookup(block, chain_index);
489 if (chain) {
490 tcf_chain_hold(chain);
491 } else {
492 if (!create)
493 goto errout;
494 chain = tcf_chain_create(block, chain_index);
495 if (!chain)
496 goto errout;
497 }
498
499 if (by_act)
500 ++chain->action_refcnt;
501 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
502 mutex_unlock(&block->lock);
503
504 /* Send notification only in case we got the first
505 * non-action reference. Until then, the chain acts only as
506 * a placeholder for actions pointing to it and user ought
507 * not know about them.
508 */
509 if (is_first_reference && !by_act)
510 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
511 RTM_NEWCHAIN, false);
512
513 return chain;
514
515errout:
516 mutex_unlock(&block->lock);
517 return chain;
518}
519
520static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
521 bool create)
522{
523 return __tcf_chain_get(block, chain_index, create, false);
524}
525
526struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
527{
528 return __tcf_chain_get(block, chain_index, true, true);
529}
530EXPORT_SYMBOL(tcf_chain_get_by_act);
531
532static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
533 void *tmplt_priv);
534static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
535 void *tmplt_priv, u32 chain_index,
536 struct tcf_block *block, struct sk_buff *oskb,
537 u32 seq, u16 flags, bool unicast);
538
539static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
540 bool explicitly_created)
541{
542 struct tcf_block *block = chain->block;
543 const struct tcf_proto_ops *tmplt_ops;
544 bool free_block = false;
545 unsigned int refcnt;
546 void *tmplt_priv;
547
548 mutex_lock(&block->lock);
549 if (explicitly_created) {
550 if (!chain->explicitly_created) {
551 mutex_unlock(&block->lock);
552 return;
553 }
554 chain->explicitly_created = false;
555 }
556
557 if (by_act)
558 chain->action_refcnt--;
559
560 /* tc_chain_notify_delete can't be called while holding block lock.
561 * However, when block is unlocked chain can be changed concurrently, so
562 * save these to temporary variables.
563 */
564 refcnt = --chain->refcnt;
565 tmplt_ops = chain->tmplt_ops;
566 tmplt_priv = chain->tmplt_priv;
567
568 /* The last dropped non-action reference will trigger notification. */
569 if (refcnt - chain->action_refcnt == 0 && !by_act) {
570 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
571 block, NULL, 0, 0, false);
572 /* Last reference to chain, no need to lock. */
573 chain->flushing = false;
574 }
575
576 if (refcnt == 0)
577 free_block = tcf_chain_detach(chain);
578 mutex_unlock(&block->lock);
579
580 if (refcnt == 0) {
581 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
582 tcf_chain_destroy(chain, free_block);
583 }
584}
585
586static void tcf_chain_put(struct tcf_chain *chain)
587{
588 __tcf_chain_put(chain, false, false);
589}
590
591void tcf_chain_put_by_act(struct tcf_chain *chain)
592{
593 __tcf_chain_put(chain, true, false);
594}
595EXPORT_SYMBOL(tcf_chain_put_by_act);
596
597static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
598{
599 __tcf_chain_put(chain, false, true);
600}
601
602static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
603{
604 struct tcf_proto *tp, *tp_next;
605
606 mutex_lock(&chain->filter_chain_lock);
607 tp = tcf_chain_dereference(chain->filter_chain, chain);
608 while (tp) {
609 tp_next = rcu_dereference_protected(tp->next, 1);
610 tcf_proto_signal_destroying(chain, tp);
611 tp = tp_next;
612 }
613 tp = tcf_chain_dereference(chain->filter_chain, chain);
614 RCU_INIT_POINTER(chain->filter_chain, NULL);
615 tcf_chain0_head_change(chain, NULL);
616 chain->flushing = true;
617 mutex_unlock(&chain->filter_chain_lock);
618
619 while (tp) {
620 tp_next = rcu_dereference_protected(tp->next, 1);
621 tcf_proto_put(tp, rtnl_held, NULL);
622 tp = tp_next;
623 }
624}
625
626static int tcf_block_setup(struct tcf_block *block,
627 struct flow_block_offload *bo);
628
629static void tc_indr_block_ing_cmd(struct net_device *dev,
630 struct tcf_block *block,
631 flow_indr_block_bind_cb_t *cb,
632 void *cb_priv,
633 enum flow_block_command command)
634{
635 struct flow_block_offload bo = {
636 .command = command,
637 .binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
638 .net = dev_net(dev),
639 .block_shared = tcf_block_non_null_shared(block),
640 };
641 INIT_LIST_HEAD(&bo.cb_list);
642
643 if (!block)
644 return;
645
646 bo.block = &block->flow_block;
647
648 down_write(&block->cb_lock);
649 cb(dev, cb_priv, TC_SETUP_BLOCK, &bo);
650
651 tcf_block_setup(block, &bo);
652 up_write(&block->cb_lock);
653}
654
655static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
656{
657 const struct Qdisc_class_ops *cops;
658 struct Qdisc *qdisc;
659
660 if (!dev_ingress_queue(dev))
661 return NULL;
662
663 qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
664 if (!qdisc)
665 return NULL;
666
667 cops = qdisc->ops->cl_ops;
668 if (!cops)
669 return NULL;
670
671 if (!cops->tcf_block)
672 return NULL;
673
674 return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
675}
676
677static void tc_indr_block_get_and_ing_cmd(struct net_device *dev,
678 flow_indr_block_bind_cb_t *cb,
679 void *cb_priv,
680 enum flow_block_command command)
681{
682 struct tcf_block *block = tc_dev_ingress_block(dev);
683
684 tc_indr_block_ing_cmd(dev, block, cb, cb_priv, command);
685}
686
687static void tc_indr_block_call(struct tcf_block *block,
688 struct net_device *dev,
689 struct tcf_block_ext_info *ei,
690 enum flow_block_command command,
691 struct netlink_ext_ack *extack)
692{
693 struct flow_block_offload bo = {
694 .command = command,
695 .binder_type = ei->binder_type,
696 .net = dev_net(dev),
697 .block = &block->flow_block,
698 .block_shared = tcf_block_shared(block),
699 .extack = extack,
700 };
701 INIT_LIST_HEAD(&bo.cb_list);
702
703 flow_indr_block_call(dev, &bo, command);
704 tcf_block_setup(block, &bo);
705}
706
707static bool tcf_block_offload_in_use(struct tcf_block *block)
708{
709 return atomic_read(&block->offloadcnt);
710}
711
712static int tcf_block_offload_cmd(struct tcf_block *block,
713 struct net_device *dev,
714 struct tcf_block_ext_info *ei,
715 enum flow_block_command command,
716 struct netlink_ext_ack *extack)
717{
718 struct flow_block_offload bo = {};
719 int err;
720
721 bo.net = dev_net(dev);
722 bo.command = command;
723 bo.binder_type = ei->binder_type;
724 bo.block = &block->flow_block;
725 bo.block_shared = tcf_block_shared(block);
726 bo.extack = extack;
727 INIT_LIST_HEAD(&bo.cb_list);
728
729 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
730 if (err < 0)
731 return err;
732
733 return tcf_block_setup(block, &bo);
734}
735
736static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
737 struct tcf_block_ext_info *ei,
738 struct netlink_ext_ack *extack)
739{
740 struct net_device *dev = q->dev_queue->dev;
741 int err;
742
743 down_write(&block->cb_lock);
744 if (!dev->netdev_ops->ndo_setup_tc)
745 goto no_offload_dev_inc;
746
747 /* If tc offload feature is disabled and the block we try to bind
748 * to already has some offloaded filters, forbid to bind.
749 */
750 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
751 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
752 err = -EOPNOTSUPP;
753 goto err_unlock;
754 }
755
756 err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_BIND, extack);
757 if (err == -EOPNOTSUPP)
758 goto no_offload_dev_inc;
759 if (err)
760 goto err_unlock;
761
762 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack);
763 up_write(&block->cb_lock);
764 return 0;
765
766no_offload_dev_inc:
767 if (tcf_block_offload_in_use(block)) {
768 err = -EOPNOTSUPP;
769 goto err_unlock;
770 }
771 err = 0;
772 block->nooffloaddevcnt++;
773 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack);
774err_unlock:
775 up_write(&block->cb_lock);
776 return err;
777}
778
779static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
780 struct tcf_block_ext_info *ei)
781{
782 struct net_device *dev = q->dev_queue->dev;
783 int err;
784
785 down_write(&block->cb_lock);
786 tc_indr_block_call(block, dev, ei, FLOW_BLOCK_UNBIND, NULL);
787
788 if (!dev->netdev_ops->ndo_setup_tc)
789 goto no_offload_dev_dec;
790 err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_UNBIND, NULL);
791 if (err == -EOPNOTSUPP)
792 goto no_offload_dev_dec;
793 up_write(&block->cb_lock);
794 return;
795
796no_offload_dev_dec:
797 WARN_ON(block->nooffloaddevcnt-- == 0);
798 up_write(&block->cb_lock);
799}
800
801static int
802tcf_chain0_head_change_cb_add(struct tcf_block *block,
803 struct tcf_block_ext_info *ei,
804 struct netlink_ext_ack *extack)
805{
806 struct tcf_filter_chain_list_item *item;
807 struct tcf_chain *chain0;
808
809 item = kmalloc(sizeof(*item), GFP_KERNEL);
810 if (!item) {
811 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
812 return -ENOMEM;
813 }
814 item->chain_head_change = ei->chain_head_change;
815 item->chain_head_change_priv = ei->chain_head_change_priv;
816
817 mutex_lock(&block->lock);
818 chain0 = block->chain0.chain;
819 if (chain0)
820 tcf_chain_hold(chain0);
821 else
822 list_add(&item->list, &block->chain0.filter_chain_list);
823 mutex_unlock(&block->lock);
824
825 if (chain0) {
826 struct tcf_proto *tp_head;
827
828 mutex_lock(&chain0->filter_chain_lock);
829
830 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
831 if (tp_head)
832 tcf_chain_head_change_item(item, tp_head);
833
834 mutex_lock(&block->lock);
835 list_add(&item->list, &block->chain0.filter_chain_list);
836 mutex_unlock(&block->lock);
837
838 mutex_unlock(&chain0->filter_chain_lock);
839 tcf_chain_put(chain0);
840 }
841
842 return 0;
843}
844
845static void
846tcf_chain0_head_change_cb_del(struct tcf_block *block,
847 struct tcf_block_ext_info *ei)
848{
849 struct tcf_filter_chain_list_item *item;
850
851 mutex_lock(&block->lock);
852 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
853 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
854 (item->chain_head_change == ei->chain_head_change &&
855 item->chain_head_change_priv == ei->chain_head_change_priv)) {
856 if (block->chain0.chain)
857 tcf_chain_head_change_item(item, NULL);
858 list_del(&item->list);
859 mutex_unlock(&block->lock);
860
861 kfree(item);
862 return;
863 }
864 }
865 mutex_unlock(&block->lock);
866 WARN_ON(1);
867}
868
869struct tcf_net {
870 spinlock_t idr_lock; /* Protects idr */
871 struct idr idr;
872};
873
874static unsigned int tcf_net_id;
875
876static int tcf_block_insert(struct tcf_block *block, struct net *net,
877 struct netlink_ext_ack *extack)
878{
879 struct tcf_net *tn = net_generic(net, tcf_net_id);
880 int err;
881
882 idr_preload(GFP_KERNEL);
883 spin_lock(&tn->idr_lock);
884 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
885 GFP_NOWAIT);
886 spin_unlock(&tn->idr_lock);
887 idr_preload_end();
888
889 return err;
890}
891
892static void tcf_block_remove(struct tcf_block *block, struct net *net)
893{
894 struct tcf_net *tn = net_generic(net, tcf_net_id);
895
896 spin_lock(&tn->idr_lock);
897 idr_remove(&tn->idr, block->index);
898 spin_unlock(&tn->idr_lock);
899}
900
901static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
902 u32 block_index,
903 struct netlink_ext_ack *extack)
904{
905 struct tcf_block *block;
906
907 block = kzalloc(sizeof(*block), GFP_KERNEL);
908 if (!block) {
909 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
910 return ERR_PTR(-ENOMEM);
911 }
912 mutex_init(&block->lock);
913 mutex_init(&block->proto_destroy_lock);
914 init_rwsem(&block->cb_lock);
915 flow_block_init(&block->flow_block);
916 INIT_LIST_HEAD(&block->chain_list);
917 INIT_LIST_HEAD(&block->owner_list);
918 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
919
920 refcount_set(&block->refcnt, 1);
921 block->net = net;
922 block->index = block_index;
923
924 /* Don't store q pointer for blocks which are shared */
925 if (!tcf_block_shared(block))
926 block->q = q;
927 return block;
928}
929
930static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
931{
932 struct tcf_net *tn = net_generic(net, tcf_net_id);
933
934 return idr_find(&tn->idr, block_index);
935}
936
937static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
938{
939 struct tcf_block *block;
940
941 rcu_read_lock();
942 block = tcf_block_lookup(net, block_index);
943 if (block && !refcount_inc_not_zero(&block->refcnt))
944 block = NULL;
945 rcu_read_unlock();
946
947 return block;
948}
949
950static struct tcf_chain *
951__tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
952{
953 mutex_lock(&block->lock);
954 if (chain)
955 chain = list_is_last(&chain->list, &block->chain_list) ?
956 NULL : list_next_entry(chain, list);
957 else
958 chain = list_first_entry_or_null(&block->chain_list,
959 struct tcf_chain, list);
960
961 /* skip all action-only chains */
962 while (chain && tcf_chain_held_by_acts_only(chain))
963 chain = list_is_last(&chain->list, &block->chain_list) ?
964 NULL : list_next_entry(chain, list);
965
966 if (chain)
967 tcf_chain_hold(chain);
968 mutex_unlock(&block->lock);
969
970 return chain;
971}
972
973/* Function to be used by all clients that want to iterate over all chains on
974 * block. It properly obtains block->lock and takes reference to chain before
975 * returning it. Users of this function must be tolerant to concurrent chain
976 * insertion/deletion or ensure that no concurrent chain modification is
977 * possible. Note that all netlink dump callbacks cannot guarantee to provide
978 * consistent dump because rtnl lock is released each time skb is filled with
979 * data and sent to user-space.
980 */
981
982struct tcf_chain *
983tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
984{
985 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
986
987 if (chain)
988 tcf_chain_put(chain);
989
990 return chain_next;
991}
992EXPORT_SYMBOL(tcf_get_next_chain);
993
994static struct tcf_proto *
995__tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
996{
997 u32 prio = 0;
998
999 ASSERT_RTNL();
1000 mutex_lock(&chain->filter_chain_lock);
1001
1002 if (!tp) {
1003 tp = tcf_chain_dereference(chain->filter_chain, chain);
1004 } else if (tcf_proto_is_deleting(tp)) {
1005 /* 'deleting' flag is set and chain->filter_chain_lock was
1006 * unlocked, which means next pointer could be invalid. Restart
1007 * search.
1008 */
1009 prio = tp->prio + 1;
1010 tp = tcf_chain_dereference(chain->filter_chain, chain);
1011
1012 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1013 if (!tp->deleting && tp->prio >= prio)
1014 break;
1015 } else {
1016 tp = tcf_chain_dereference(tp->next, chain);
1017 }
1018
1019 if (tp)
1020 tcf_proto_get(tp);
1021
1022 mutex_unlock(&chain->filter_chain_lock);
1023
1024 return tp;
1025}
1026
1027/* Function to be used by all clients that want to iterate over all tp's on
1028 * chain. Users of this function must be tolerant to concurrent tp
1029 * insertion/deletion or ensure that no concurrent chain modification is
1030 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1031 * consistent dump because rtnl lock is released each time skb is filled with
1032 * data and sent to user-space.
1033 */
1034
1035struct tcf_proto *
1036tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
1037 bool rtnl_held)
1038{
1039 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1040
1041 if (tp)
1042 tcf_proto_put(tp, rtnl_held, NULL);
1043
1044 return tp_next;
1045}
1046EXPORT_SYMBOL(tcf_get_next_proto);
1047
1048static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1049{
1050 struct tcf_chain *chain;
1051
1052 /* Last reference to block. At this point chains cannot be added or
1053 * removed concurrently.
1054 */
1055 for (chain = tcf_get_next_chain(block, NULL);
1056 chain;
1057 chain = tcf_get_next_chain(block, chain)) {
1058 tcf_chain_put_explicitly_created(chain);
1059 tcf_chain_flush(chain, rtnl_held);
1060 }
1061}
1062
1063/* Lookup Qdisc and increments its reference counter.
1064 * Set parent, if necessary.
1065 */
1066
1067static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1068 u32 *parent, int ifindex, bool rtnl_held,
1069 struct netlink_ext_ack *extack)
1070{
1071 const struct Qdisc_class_ops *cops;
1072 struct net_device *dev;
1073 int err = 0;
1074
1075 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1076 return 0;
1077
1078 rcu_read_lock();
1079
1080 /* Find link */
1081 dev = dev_get_by_index_rcu(net, ifindex);
1082 if (!dev) {
1083 rcu_read_unlock();
1084 return -ENODEV;
1085 }
1086
1087 /* Find qdisc */
1088 if (!*parent) {
1089 *q = dev->qdisc;
1090 *parent = (*q)->handle;
1091 } else {
1092 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1093 if (!*q) {
1094 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1095 err = -EINVAL;
1096 goto errout_rcu;
1097 }
1098 }
1099
1100 *q = qdisc_refcount_inc_nz(*q);
1101 if (!*q) {
1102 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1103 err = -EINVAL;
1104 goto errout_rcu;
1105 }
1106
1107 /* Is it classful? */
1108 cops = (*q)->ops->cl_ops;
1109 if (!cops) {
1110 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1111 err = -EINVAL;
1112 goto errout_qdisc;
1113 }
1114
1115 if (!cops->tcf_block) {
1116 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1117 err = -EOPNOTSUPP;
1118 goto errout_qdisc;
1119 }
1120
1121errout_rcu:
1122 /* At this point we know that qdisc is not noop_qdisc,
1123 * which means that qdisc holds a reference to net_device
1124 * and we hold a reference to qdisc, so it is safe to release
1125 * rcu read lock.
1126 */
1127 rcu_read_unlock();
1128 return err;
1129
1130errout_qdisc:
1131 rcu_read_unlock();
1132
1133 if (rtnl_held)
1134 qdisc_put(*q);
1135 else
1136 qdisc_put_unlocked(*q);
1137 *q = NULL;
1138
1139 return err;
1140}
1141
1142static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1143 int ifindex, struct netlink_ext_ack *extack)
1144{
1145 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1146 return 0;
1147
1148 /* Do we search for filter, attached to class? */
1149 if (TC_H_MIN(parent)) {
1150 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1151
1152 *cl = cops->find(q, parent);
1153 if (*cl == 0) {
1154 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1155 return -ENOENT;
1156 }
1157 }
1158
1159 return 0;
1160}
1161
1162static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1163 unsigned long cl, int ifindex,
1164 u32 block_index,
1165 struct netlink_ext_ack *extack)
1166{
1167 struct tcf_block *block;
1168
1169 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1170 block = tcf_block_refcnt_get(net, block_index);
1171 if (!block) {
1172 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1173 return ERR_PTR(-EINVAL);
1174 }
1175 } else {
1176 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1177
1178 block = cops->tcf_block(q, cl, extack);
1179 if (!block)
1180 return ERR_PTR(-EINVAL);
1181
1182 if (tcf_block_shared(block)) {
1183 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1184 return ERR_PTR(-EOPNOTSUPP);
1185 }
1186
1187 /* Always take reference to block in order to support execution
1188 * of rules update path of cls API without rtnl lock. Caller
1189 * must release block when it is finished using it. 'if' block
1190 * of this conditional obtain reference to block by calling
1191 * tcf_block_refcnt_get().
1192 */
1193 refcount_inc(&block->refcnt);
1194 }
1195
1196 return block;
1197}
1198
1199static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1200 struct tcf_block_ext_info *ei, bool rtnl_held)
1201{
1202 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1203 /* Flushing/putting all chains will cause the block to be
1204 * deallocated when last chain is freed. However, if chain_list
1205 * is empty, block has to be manually deallocated. After block
1206 * reference counter reached 0, it is no longer possible to
1207 * increment it or add new chains to block.
1208 */
1209 bool free_block = list_empty(&block->chain_list);
1210
1211 mutex_unlock(&block->lock);
1212 if (tcf_block_shared(block))
1213 tcf_block_remove(block, block->net);
1214
1215 if (q)
1216 tcf_block_offload_unbind(block, q, ei);
1217
1218 if (free_block)
1219 tcf_block_destroy(block);
1220 else
1221 tcf_block_flush_all_chains(block, rtnl_held);
1222 } else if (q) {
1223 tcf_block_offload_unbind(block, q, ei);
1224 }
1225}
1226
1227static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1228{
1229 __tcf_block_put(block, NULL, NULL, rtnl_held);
1230}
1231
1232/* Find tcf block.
1233 * Set q, parent, cl when appropriate.
1234 */
1235
1236static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1237 u32 *parent, unsigned long *cl,
1238 int ifindex, u32 block_index,
1239 struct netlink_ext_ack *extack)
1240{
1241 struct tcf_block *block;
1242 int err = 0;
1243
1244 ASSERT_RTNL();
1245
1246 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1247 if (err)
1248 goto errout;
1249
1250 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1251 if (err)
1252 goto errout_qdisc;
1253
1254 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1255 if (IS_ERR(block)) {
1256 err = PTR_ERR(block);
1257 goto errout_qdisc;
1258 }
1259
1260 return block;
1261
1262errout_qdisc:
1263 if (*q)
1264 qdisc_put(*q);
1265errout:
1266 *q = NULL;
1267 return ERR_PTR(err);
1268}
1269
1270static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1271 bool rtnl_held)
1272{
1273 if (!IS_ERR_OR_NULL(block))
1274 tcf_block_refcnt_put(block, rtnl_held);
1275
1276 if (q) {
1277 if (rtnl_held)
1278 qdisc_put(q);
1279 else
1280 qdisc_put_unlocked(q);
1281 }
1282}
1283
1284struct tcf_block_owner_item {
1285 struct list_head list;
1286 struct Qdisc *q;
1287 enum flow_block_binder_type binder_type;
1288};
1289
1290static void
1291tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1292 struct Qdisc *q,
1293 enum flow_block_binder_type binder_type)
1294{
1295 if (block->keep_dst &&
1296 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1297 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1298 netif_keep_dst(qdisc_dev(q));
1299}
1300
1301void tcf_block_netif_keep_dst(struct tcf_block *block)
1302{
1303 struct tcf_block_owner_item *item;
1304
1305 block->keep_dst = true;
1306 list_for_each_entry(item, &block->owner_list, list)
1307 tcf_block_owner_netif_keep_dst(block, item->q,
1308 item->binder_type);
1309}
1310EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1311
1312static int tcf_block_owner_add(struct tcf_block *block,
1313 struct Qdisc *q,
1314 enum flow_block_binder_type binder_type)
1315{
1316 struct tcf_block_owner_item *item;
1317
1318 item = kmalloc(sizeof(*item), GFP_KERNEL);
1319 if (!item)
1320 return -ENOMEM;
1321 item->q = q;
1322 item->binder_type = binder_type;
1323 list_add(&item->list, &block->owner_list);
1324 return 0;
1325}
1326
1327static void tcf_block_owner_del(struct tcf_block *block,
1328 struct Qdisc *q,
1329 enum flow_block_binder_type binder_type)
1330{
1331 struct tcf_block_owner_item *item;
1332
1333 list_for_each_entry(item, &block->owner_list, list) {
1334 if (item->q == q && item->binder_type == binder_type) {
1335 list_del(&item->list);
1336 kfree(item);
1337 return;
1338 }
1339 }
1340 WARN_ON(1);
1341}
1342
1343int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1344 struct tcf_block_ext_info *ei,
1345 struct netlink_ext_ack *extack)
1346{
1347 struct net *net = qdisc_net(q);
1348 struct tcf_block *block = NULL;
1349 int err;
1350
1351 if (ei->block_index)
1352 /* block_index not 0 means the shared block is requested */
1353 block = tcf_block_refcnt_get(net, ei->block_index);
1354
1355 if (!block) {
1356 block = tcf_block_create(net, q, ei->block_index, extack);
1357 if (IS_ERR(block))
1358 return PTR_ERR(block);
1359 if (tcf_block_shared(block)) {
1360 err = tcf_block_insert(block, net, extack);
1361 if (err)
1362 goto err_block_insert;
1363 }
1364 }
1365
1366 err = tcf_block_owner_add(block, q, ei->binder_type);
1367 if (err)
1368 goto err_block_owner_add;
1369
1370 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1371
1372 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1373 if (err)
1374 goto err_chain0_head_change_cb_add;
1375
1376 err = tcf_block_offload_bind(block, q, ei, extack);
1377 if (err)
1378 goto err_block_offload_bind;
1379
1380 *p_block = block;
1381 return 0;
1382
1383err_block_offload_bind:
1384 tcf_chain0_head_change_cb_del(block, ei);
1385err_chain0_head_change_cb_add:
1386 tcf_block_owner_del(block, q, ei->binder_type);
1387err_block_owner_add:
1388err_block_insert:
1389 tcf_block_refcnt_put(block, true);
1390 return err;
1391}
1392EXPORT_SYMBOL(tcf_block_get_ext);
1393
1394static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1395{
1396 struct tcf_proto __rcu **p_filter_chain = priv;
1397
1398 rcu_assign_pointer(*p_filter_chain, tp_head);
1399}
1400
1401int tcf_block_get(struct tcf_block **p_block,
1402 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1403 struct netlink_ext_ack *extack)
1404{
1405 struct tcf_block_ext_info ei = {
1406 .chain_head_change = tcf_chain_head_change_dflt,
1407 .chain_head_change_priv = p_filter_chain,
1408 };
1409
1410 WARN_ON(!p_filter_chain);
1411 return tcf_block_get_ext(p_block, q, &ei, extack);
1412}
1413EXPORT_SYMBOL(tcf_block_get);
1414
1415/* XXX: Standalone actions are not allowed to jump to any chain, and bound
1416 * actions should be all removed after flushing.
1417 */
1418void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1419 struct tcf_block_ext_info *ei)
1420{
1421 if (!block)
1422 return;
1423 tcf_chain0_head_change_cb_del(block, ei);
1424 tcf_block_owner_del(block, q, ei->binder_type);
1425
1426 __tcf_block_put(block, q, ei, true);
1427}
1428EXPORT_SYMBOL(tcf_block_put_ext);
1429
1430void tcf_block_put(struct tcf_block *block)
1431{
1432 struct tcf_block_ext_info ei = {0, };
1433
1434 if (!block)
1435 return;
1436 tcf_block_put_ext(block, block->q, &ei);
1437}
1438
1439EXPORT_SYMBOL(tcf_block_put);
1440
1441static int
1442tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
1443 void *cb_priv, bool add, bool offload_in_use,
1444 struct netlink_ext_ack *extack)
1445{
1446 struct tcf_chain *chain, *chain_prev;
1447 struct tcf_proto *tp, *tp_prev;
1448 int err;
1449
1450 lockdep_assert_held(&block->cb_lock);
1451
1452 for (chain = __tcf_get_next_chain(block, NULL);
1453 chain;
1454 chain_prev = chain,
1455 chain = __tcf_get_next_chain(block, chain),
1456 tcf_chain_put(chain_prev)) {
1457 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1458 tp_prev = tp,
1459 tp = __tcf_get_next_proto(chain, tp),
1460 tcf_proto_put(tp_prev, true, NULL)) {
1461 if (tp->ops->reoffload) {
1462 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1463 extack);
1464 if (err && add)
1465 goto err_playback_remove;
1466 } else if (add && offload_in_use) {
1467 err = -EOPNOTSUPP;
1468 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1469 goto err_playback_remove;
1470 }
1471 }
1472 }
1473
1474 return 0;
1475
1476err_playback_remove:
1477 tcf_proto_put(tp, true, NULL);
1478 tcf_chain_put(chain);
1479 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1480 extack);
1481 return err;
1482}
1483
1484static int tcf_block_bind(struct tcf_block *block,
1485 struct flow_block_offload *bo)
1486{
1487 struct flow_block_cb *block_cb, *next;
1488 int err, i = 0;
1489
1490 lockdep_assert_held(&block->cb_lock);
1491
1492 list_for_each_entry(block_cb, &bo->cb_list, list) {
1493 err = tcf_block_playback_offloads(block, block_cb->cb,
1494 block_cb->cb_priv, true,
1495 tcf_block_offload_in_use(block),
1496 bo->extack);
1497 if (err)
1498 goto err_unroll;
1499 if (!bo->unlocked_driver_cb)
1500 block->lockeddevcnt++;
1501
1502 i++;
1503 }
1504 list_splice(&bo->cb_list, &block->flow_block.cb_list);
1505
1506 return 0;
1507
1508err_unroll:
1509 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1510 if (i-- > 0) {
1511 list_del(&block_cb->list);
1512 tcf_block_playback_offloads(block, block_cb->cb,
1513 block_cb->cb_priv, false,
1514 tcf_block_offload_in_use(block),
1515 NULL);
1516 if (!bo->unlocked_driver_cb)
1517 block->lockeddevcnt--;
1518 }
1519 flow_block_cb_free(block_cb);
1520 }
1521
1522 return err;
1523}
1524
1525static void tcf_block_unbind(struct tcf_block *block,
1526 struct flow_block_offload *bo)
1527{
1528 struct flow_block_cb *block_cb, *next;
1529
1530 lockdep_assert_held(&block->cb_lock);
1531
1532 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1533 tcf_block_playback_offloads(block, block_cb->cb,
1534 block_cb->cb_priv, false,
1535 tcf_block_offload_in_use(block),
1536 NULL);
1537 list_del(&block_cb->list);
1538 flow_block_cb_free(block_cb);
1539 if (!bo->unlocked_driver_cb)
1540 block->lockeddevcnt--;
1541 }
1542}
1543
1544static int tcf_block_setup(struct tcf_block *block,
1545 struct flow_block_offload *bo)
1546{
1547 int err;
1548
1549 switch (bo->command) {
1550 case FLOW_BLOCK_BIND:
1551 err = tcf_block_bind(block, bo);
1552 break;
1553 case FLOW_BLOCK_UNBIND:
1554 err = 0;
1555 tcf_block_unbind(block, bo);
1556 break;
1557 default:
1558 WARN_ON_ONCE(1);
1559 err = -EOPNOTSUPP;
1560 }
1561
1562 return err;
1563}
1564
1565/* Main classifier routine: scans classifier chain attached
1566 * to this qdisc, (optionally) tests for protocol and asks
1567 * specific classifiers.
1568 */
1569int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1570 struct tcf_result *res, bool compat_mode)
1571{
1572#ifdef CONFIG_NET_CLS_ACT
1573 const int max_reclassify_loop = 4;
1574 const struct tcf_proto *orig_tp = tp;
1575 const struct tcf_proto *first_tp;
1576 int limit = 0;
1577
1578reclassify:
1579#endif
1580 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1581 __be16 protocol = tc_skb_protocol(skb);
1582 int err;
1583
1584 if (tp->protocol != protocol &&
1585 tp->protocol != htons(ETH_P_ALL))
1586 continue;
1587
1588 err = tp->classify(skb, tp, res);
1589#ifdef CONFIG_NET_CLS_ACT
1590 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1591 first_tp = orig_tp;
1592 goto reset;
1593 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1594 first_tp = res->goto_tp;
1595
1596#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1597 {
1598 struct tc_skb_ext *ext;
1599
1600 ext = skb_ext_add(skb, TC_SKB_EXT);
1601 if (WARN_ON_ONCE(!ext))
1602 return TC_ACT_SHOT;
1603
1604 ext->chain = err & TC_ACT_EXT_VAL_MASK;
1605 }
1606#endif
1607 goto reset;
1608 }
1609#endif
1610 if (err >= 0)
1611 return err;
1612 }
1613
1614 return TC_ACT_UNSPEC; /* signal: continue lookup */
1615#ifdef CONFIG_NET_CLS_ACT
1616reset:
1617 if (unlikely(limit++ >= max_reclassify_loop)) {
1618 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1619 tp->chain->block->index,
1620 tp->prio & 0xffff,
1621 ntohs(tp->protocol));
1622 return TC_ACT_SHOT;
1623 }
1624
1625 tp = first_tp;
1626 goto reclassify;
1627#endif
1628}
1629EXPORT_SYMBOL(tcf_classify);
1630
1631struct tcf_chain_info {
1632 struct tcf_proto __rcu **pprev;
1633 struct tcf_proto __rcu *next;
1634};
1635
1636static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1637 struct tcf_chain_info *chain_info)
1638{
1639 return tcf_chain_dereference(*chain_info->pprev, chain);
1640}
1641
1642static int tcf_chain_tp_insert(struct tcf_chain *chain,
1643 struct tcf_chain_info *chain_info,
1644 struct tcf_proto *tp)
1645{
1646 if (chain->flushing)
1647 return -EAGAIN;
1648
1649 if (*chain_info->pprev == chain->filter_chain)
1650 tcf_chain0_head_change(chain, tp);
1651 tcf_proto_get(tp);
1652 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1653 rcu_assign_pointer(*chain_info->pprev, tp);
1654
1655 return 0;
1656}
1657
1658static void tcf_chain_tp_remove(struct tcf_chain *chain,
1659 struct tcf_chain_info *chain_info,
1660 struct tcf_proto *tp)
1661{
1662 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1663
1664 tcf_proto_mark_delete(tp);
1665 if (tp == chain->filter_chain)
1666 tcf_chain0_head_change(chain, next);
1667 RCU_INIT_POINTER(*chain_info->pprev, next);
1668}
1669
1670static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1671 struct tcf_chain_info *chain_info,
1672 u32 protocol, u32 prio,
1673 bool prio_allocate);
1674
1675/* Try to insert new proto.
1676 * If proto with specified priority already exists, free new proto
1677 * and return existing one.
1678 */
1679
1680static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1681 struct tcf_proto *tp_new,
1682 u32 protocol, u32 prio,
1683 bool rtnl_held)
1684{
1685 struct tcf_chain_info chain_info;
1686 struct tcf_proto *tp;
1687 int err = 0;
1688
1689 mutex_lock(&chain->filter_chain_lock);
1690
1691 if (tcf_proto_exists_destroying(chain, tp_new)) {
1692 mutex_unlock(&chain->filter_chain_lock);
1693 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1694 return ERR_PTR(-EAGAIN);
1695 }
1696
1697 tp = tcf_chain_tp_find(chain, &chain_info,
1698 protocol, prio, false);
1699 if (!tp)
1700 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1701 mutex_unlock(&chain->filter_chain_lock);
1702
1703 if (tp) {
1704 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1705 tp_new = tp;
1706 } else if (err) {
1707 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1708 tp_new = ERR_PTR(err);
1709 }
1710
1711 return tp_new;
1712}
1713
1714static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1715 struct tcf_proto *tp, bool rtnl_held,
1716 struct netlink_ext_ack *extack)
1717{
1718 struct tcf_chain_info chain_info;
1719 struct tcf_proto *tp_iter;
1720 struct tcf_proto **pprev;
1721 struct tcf_proto *next;
1722
1723 mutex_lock(&chain->filter_chain_lock);
1724
1725 /* Atomically find and remove tp from chain. */
1726 for (pprev = &chain->filter_chain;
1727 (tp_iter = tcf_chain_dereference(*pprev, chain));
1728 pprev = &tp_iter->next) {
1729 if (tp_iter == tp) {
1730 chain_info.pprev = pprev;
1731 chain_info.next = tp_iter->next;
1732 WARN_ON(tp_iter->deleting);
1733 break;
1734 }
1735 }
1736 /* Verify that tp still exists and no new filters were inserted
1737 * concurrently.
1738 * Mark tp for deletion if it is empty.
1739 */
1740 if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) {
1741 mutex_unlock(&chain->filter_chain_lock);
1742 return;
1743 }
1744
1745 tcf_proto_signal_destroying(chain, tp);
1746 next = tcf_chain_dereference(chain_info.next, chain);
1747 if (tp == chain->filter_chain)
1748 tcf_chain0_head_change(chain, next);
1749 RCU_INIT_POINTER(*chain_info.pprev, next);
1750 mutex_unlock(&chain->filter_chain_lock);
1751
1752 tcf_proto_put(tp, rtnl_held, extack);
1753}
1754
1755static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1756 struct tcf_chain_info *chain_info,
1757 u32 protocol, u32 prio,
1758 bool prio_allocate)
1759{
1760 struct tcf_proto **pprev;
1761 struct tcf_proto *tp;
1762
1763 /* Check the chain for existence of proto-tcf with this priority */
1764 for (pprev = &chain->filter_chain;
1765 (tp = tcf_chain_dereference(*pprev, chain));
1766 pprev = &tp->next) {
1767 if (tp->prio >= prio) {
1768 if (tp->prio == prio) {
1769 if (prio_allocate ||
1770 (tp->protocol != protocol && protocol))
1771 return ERR_PTR(-EINVAL);
1772 } else {
1773 tp = NULL;
1774 }
1775 break;
1776 }
1777 }
1778 chain_info->pprev = pprev;
1779 if (tp) {
1780 chain_info->next = tp->next;
1781 tcf_proto_get(tp);
1782 } else {
1783 chain_info->next = NULL;
1784 }
1785 return tp;
1786}
1787
1788static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1789 struct tcf_proto *tp, struct tcf_block *block,
1790 struct Qdisc *q, u32 parent, void *fh,
1791 u32 portid, u32 seq, u16 flags, int event,
1792 bool rtnl_held)
1793{
1794 struct tcmsg *tcm;
1795 struct nlmsghdr *nlh;
1796 unsigned char *b = skb_tail_pointer(skb);
1797
1798 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1799 if (!nlh)
1800 goto out_nlmsg_trim;
1801 tcm = nlmsg_data(nlh);
1802 tcm->tcm_family = AF_UNSPEC;
1803 tcm->tcm__pad1 = 0;
1804 tcm->tcm__pad2 = 0;
1805 if (q) {
1806 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1807 tcm->tcm_parent = parent;
1808 } else {
1809 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1810 tcm->tcm_block_index = block->index;
1811 }
1812 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1813 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1814 goto nla_put_failure;
1815 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1816 goto nla_put_failure;
1817 if (!fh) {
1818 tcm->tcm_handle = 0;
1819 } else {
1820 if (tp->ops->dump &&
1821 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1822 goto nla_put_failure;
1823 }
1824 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1825 return skb->len;
1826
1827out_nlmsg_trim:
1828nla_put_failure:
1829 nlmsg_trim(skb, b);
1830 return -1;
1831}
1832
1833static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1834 struct nlmsghdr *n, struct tcf_proto *tp,
1835 struct tcf_block *block, struct Qdisc *q,
1836 u32 parent, void *fh, int event, bool unicast,
1837 bool rtnl_held)
1838{
1839 struct sk_buff *skb;
1840 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1841 int err = 0;
1842
1843 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1844 if (!skb)
1845 return -ENOBUFS;
1846
1847 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1848 n->nlmsg_seq, n->nlmsg_flags, event,
1849 rtnl_held) <= 0) {
1850 kfree_skb(skb);
1851 return -EINVAL;
1852 }
1853
1854 if (unicast)
1855 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1856 else
1857 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1858 n->nlmsg_flags & NLM_F_ECHO);
1859
1860 if (err > 0)
1861 err = 0;
1862 return err;
1863}
1864
1865static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1866 struct nlmsghdr *n, struct tcf_proto *tp,
1867 struct tcf_block *block, struct Qdisc *q,
1868 u32 parent, void *fh, bool unicast, bool *last,
1869 bool rtnl_held, struct netlink_ext_ack *extack)
1870{
1871 struct sk_buff *skb;
1872 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1873 int err;
1874
1875 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1876 if (!skb)
1877 return -ENOBUFS;
1878
1879 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1880 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1881 rtnl_held) <= 0) {
1882 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1883 kfree_skb(skb);
1884 return -EINVAL;
1885 }
1886
1887 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1888 if (err) {
1889 kfree_skb(skb);
1890 return err;
1891 }
1892
1893 if (unicast)
1894 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1895 else
1896 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1897 n->nlmsg_flags & NLM_F_ECHO);
1898 if (err < 0)
1899 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1900
1901 if (err > 0)
1902 err = 0;
1903 return err;
1904}
1905
1906static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1907 struct tcf_block *block, struct Qdisc *q,
1908 u32 parent, struct nlmsghdr *n,
1909 struct tcf_chain *chain, int event,
1910 bool rtnl_held)
1911{
1912 struct tcf_proto *tp;
1913
1914 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1915 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1916 tfilter_notify(net, oskb, n, tp, block,
1917 q, parent, NULL, event, false, rtnl_held);
1918}
1919
1920static void tfilter_put(struct tcf_proto *tp, void *fh)
1921{
1922 if (tp->ops->put && fh)
1923 tp->ops->put(tp, fh);
1924}
1925
1926static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1927 struct netlink_ext_ack *extack)
1928{
1929 struct net *net = sock_net(skb->sk);
1930 struct nlattr *tca[TCA_MAX + 1];
1931 char name[IFNAMSIZ];
1932 struct tcmsg *t;
1933 u32 protocol;
1934 u32 prio;
1935 bool prio_allocate;
1936 u32 parent;
1937 u32 chain_index;
1938 struct Qdisc *q = NULL;
1939 struct tcf_chain_info chain_info;
1940 struct tcf_chain *chain = NULL;
1941 struct tcf_block *block;
1942 struct tcf_proto *tp;
1943 unsigned long cl;
1944 void *fh;
1945 int err;
1946 int tp_created;
1947 bool rtnl_held = false;
1948
1949 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1950 return -EPERM;
1951
1952replay:
1953 tp_created = 0;
1954
1955 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
1956 rtm_tca_policy, extack);
1957 if (err < 0)
1958 return err;
1959
1960 t = nlmsg_data(n);
1961 protocol = TC_H_MIN(t->tcm_info);
1962 prio = TC_H_MAJ(t->tcm_info);
1963 prio_allocate = false;
1964 parent = t->tcm_parent;
1965 tp = NULL;
1966 cl = 0;
1967 block = NULL;
1968
1969 if (prio == 0) {
1970 /* If no priority is provided by the user,
1971 * we allocate one.
1972 */
1973 if (n->nlmsg_flags & NLM_F_CREATE) {
1974 prio = TC_H_MAKE(0x80000000U, 0U);
1975 prio_allocate = true;
1976 } else {
1977 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1978 return -ENOENT;
1979 }
1980 }
1981
1982 /* Find head of filter chain. */
1983
1984 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
1985 if (err)
1986 return err;
1987
1988 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
1989 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
1990 err = -EINVAL;
1991 goto errout;
1992 }
1993
1994 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
1995 * block is shared (no qdisc found), qdisc is not unlocked, classifier
1996 * type is not specified, classifier is not unlocked.
1997 */
1998 if (rtnl_held ||
1999 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2000 !tcf_proto_is_unlocked(name)) {
2001 rtnl_held = true;
2002 rtnl_lock();
2003 }
2004
2005 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2006 if (err)
2007 goto errout;
2008
2009 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2010 extack);
2011 if (IS_ERR(block)) {
2012 err = PTR_ERR(block);
2013 goto errout;
2014 }
2015
2016 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2017 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2018 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2019 err = -EINVAL;
2020 goto errout;
2021 }
2022 chain = tcf_chain_get(block, chain_index, true);
2023 if (!chain) {
2024 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2025 err = -ENOMEM;
2026 goto errout;
2027 }
2028
2029 mutex_lock(&chain->filter_chain_lock);
2030 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2031 prio, prio_allocate);
2032 if (IS_ERR(tp)) {
2033 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2034 err = PTR_ERR(tp);
2035 goto errout_locked;
2036 }
2037
2038 if (tp == NULL) {
2039 struct tcf_proto *tp_new = NULL;
2040
2041 if (chain->flushing) {
2042 err = -EAGAIN;
2043 goto errout_locked;
2044 }
2045
2046 /* Proto-tcf does not exist, create new one */
2047
2048 if (tca[TCA_KIND] == NULL || !protocol) {
2049 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2050 err = -EINVAL;
2051 goto errout_locked;
2052 }
2053
2054 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2055 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2056 err = -ENOENT;
2057 goto errout_locked;
2058 }
2059
2060 if (prio_allocate)
2061 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2062 &chain_info));
2063
2064 mutex_unlock(&chain->filter_chain_lock);
2065 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]),
2066 protocol, prio, chain, rtnl_held,
2067 extack);
2068 if (IS_ERR(tp_new)) {
2069 err = PTR_ERR(tp_new);
2070 goto errout_tp;
2071 }
2072
2073 tp_created = 1;
2074 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2075 rtnl_held);
2076 if (IS_ERR(tp)) {
2077 err = PTR_ERR(tp);
2078 goto errout_tp;
2079 }
2080 } else {
2081 mutex_unlock(&chain->filter_chain_lock);
2082 }
2083
2084 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2085 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2086 err = -EINVAL;
2087 goto errout;
2088 }
2089
2090 fh = tp->ops->get(tp, t->tcm_handle);
2091
2092 if (!fh) {
2093 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2094 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2095 err = -ENOENT;
2096 goto errout;
2097 }
2098 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2099 tfilter_put(tp, fh);
2100 NL_SET_ERR_MSG(extack, "Filter already exists");
2101 err = -EEXIST;
2102 goto errout;
2103 }
2104
2105 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2106 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2107 err = -EINVAL;
2108 goto errout;
2109 }
2110
2111 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2112 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2113 rtnl_held, extack);
2114 if (err == 0) {
2115 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2116 RTM_NEWTFILTER, false, rtnl_held);
2117 tfilter_put(tp, fh);
2118 /* q pointer is NULL for shared blocks */
2119 if (q)
2120 q->flags &= ~TCQ_F_CAN_BYPASS;
2121 }
2122
2123errout:
2124 if (err && tp_created)
2125 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2126errout_tp:
2127 if (chain) {
2128 if (tp && !IS_ERR(tp))
2129 tcf_proto_put(tp, rtnl_held, NULL);
2130 if (!tp_created)
2131 tcf_chain_put(chain);
2132 }
2133 tcf_block_release(q, block, rtnl_held);
2134
2135 if (rtnl_held)
2136 rtnl_unlock();
2137
2138 if (err == -EAGAIN) {
2139 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2140 * of target chain.
2141 */
2142 rtnl_held = true;
2143 /* Replay the request. */
2144 goto replay;
2145 }
2146 return err;
2147
2148errout_locked:
2149 mutex_unlock(&chain->filter_chain_lock);
2150 goto errout;
2151}
2152
2153static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2154 struct netlink_ext_ack *extack)
2155{
2156 struct net *net = sock_net(skb->sk);
2157 struct nlattr *tca[TCA_MAX + 1];
2158 char name[IFNAMSIZ];
2159 struct tcmsg *t;
2160 u32 protocol;
2161 u32 prio;
2162 u32 parent;
2163 u32 chain_index;
2164 struct Qdisc *q = NULL;
2165 struct tcf_chain_info chain_info;
2166 struct tcf_chain *chain = NULL;
2167 struct tcf_block *block = NULL;
2168 struct tcf_proto *tp = NULL;
2169 unsigned long cl = 0;
2170 void *fh = NULL;
2171 int err;
2172 bool rtnl_held = false;
2173
2174 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2175 return -EPERM;
2176
2177 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2178 rtm_tca_policy, extack);
2179 if (err < 0)
2180 return err;
2181
2182 t = nlmsg_data(n);
2183 protocol = TC_H_MIN(t->tcm_info);
2184 prio = TC_H_MAJ(t->tcm_info);
2185 parent = t->tcm_parent;
2186
2187 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2188 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2189 return -ENOENT;
2190 }
2191
2192 /* Find head of filter chain. */
2193
2194 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2195 if (err)
2196 return err;
2197
2198 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2199 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2200 err = -EINVAL;
2201 goto errout;
2202 }
2203 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2204 * found), qdisc is not unlocked, classifier type is not specified,
2205 * classifier is not unlocked.
2206 */
2207 if (!prio ||
2208 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2209 !tcf_proto_is_unlocked(name)) {
2210 rtnl_held = true;
2211 rtnl_lock();
2212 }
2213
2214 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2215 if (err)
2216 goto errout;
2217
2218 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2219 extack);
2220 if (IS_ERR(block)) {
2221 err = PTR_ERR(block);
2222 goto errout;
2223 }
2224
2225 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2226 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2227 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2228 err = -EINVAL;
2229 goto errout;
2230 }
2231 chain = tcf_chain_get(block, chain_index, false);
2232 if (!chain) {
2233 /* User requested flush on non-existent chain. Nothing to do,
2234 * so just return success.
2235 */
2236 if (prio == 0) {
2237 err = 0;
2238 goto errout;
2239 }
2240 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2241 err = -ENOENT;
2242 goto errout;
2243 }
2244
2245 if (prio == 0) {
2246 tfilter_notify_chain(net, skb, block, q, parent, n,
2247 chain, RTM_DELTFILTER, rtnl_held);
2248 tcf_chain_flush(chain, rtnl_held);
2249 err = 0;
2250 goto errout;
2251 }
2252
2253 mutex_lock(&chain->filter_chain_lock);
2254 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2255 prio, false);
2256 if (!tp || IS_ERR(tp)) {
2257 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2258 err = tp ? PTR_ERR(tp) : -ENOENT;
2259 goto errout_locked;
2260 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2261 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2262 err = -EINVAL;
2263 goto errout_locked;
2264 } else if (t->tcm_handle == 0) {
2265 tcf_proto_signal_destroying(chain, tp);
2266 tcf_chain_tp_remove(chain, &chain_info, tp);
2267 mutex_unlock(&chain->filter_chain_lock);
2268
2269 tcf_proto_put(tp, rtnl_held, NULL);
2270 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2271 RTM_DELTFILTER, false, rtnl_held);
2272 err = 0;
2273 goto errout;
2274 }
2275 mutex_unlock(&chain->filter_chain_lock);
2276
2277 fh = tp->ops->get(tp, t->tcm_handle);
2278
2279 if (!fh) {
2280 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2281 err = -ENOENT;
2282 } else {
2283 bool last;
2284
2285 err = tfilter_del_notify(net, skb, n, tp, block,
2286 q, parent, fh, false, &last,
2287 rtnl_held, extack);
2288
2289 if (err)
2290 goto errout;
2291 if (last)
2292 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2293 }
2294
2295errout:
2296 if (chain) {
2297 if (tp && !IS_ERR(tp))
2298 tcf_proto_put(tp, rtnl_held, NULL);
2299 tcf_chain_put(chain);
2300 }
2301 tcf_block_release(q, block, rtnl_held);
2302
2303 if (rtnl_held)
2304 rtnl_unlock();
2305
2306 return err;
2307
2308errout_locked:
2309 mutex_unlock(&chain->filter_chain_lock);
2310 goto errout;
2311}
2312
2313static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2314 struct netlink_ext_ack *extack)
2315{
2316 struct net *net = sock_net(skb->sk);
2317 struct nlattr *tca[TCA_MAX + 1];
2318 char name[IFNAMSIZ];
2319 struct tcmsg *t;
2320 u32 protocol;
2321 u32 prio;
2322 u32 parent;
2323 u32 chain_index;
2324 struct Qdisc *q = NULL;
2325 struct tcf_chain_info chain_info;
2326 struct tcf_chain *chain = NULL;
2327 struct tcf_block *block = NULL;
2328 struct tcf_proto *tp = NULL;
2329 unsigned long cl = 0;
2330 void *fh = NULL;
2331 int err;
2332 bool rtnl_held = false;
2333
2334 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2335 rtm_tca_policy, extack);
2336 if (err < 0)
2337 return err;
2338
2339 t = nlmsg_data(n);
2340 protocol = TC_H_MIN(t->tcm_info);
2341 prio = TC_H_MAJ(t->tcm_info);
2342 parent = t->tcm_parent;
2343
2344 if (prio == 0) {
2345 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2346 return -ENOENT;
2347 }
2348
2349 /* Find head of filter chain. */
2350
2351 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2352 if (err)
2353 return err;
2354
2355 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2356 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2357 err = -EINVAL;
2358 goto errout;
2359 }
2360 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2361 * unlocked, classifier type is not specified, classifier is not
2362 * unlocked.
2363 */
2364 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2365 !tcf_proto_is_unlocked(name)) {
2366 rtnl_held = true;
2367 rtnl_lock();
2368 }
2369
2370 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2371 if (err)
2372 goto errout;
2373
2374 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2375 extack);
2376 if (IS_ERR(block)) {
2377 err = PTR_ERR(block);
2378 goto errout;
2379 }
2380
2381 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2382 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2383 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2384 err = -EINVAL;
2385 goto errout;
2386 }
2387 chain = tcf_chain_get(block, chain_index, false);
2388 if (!chain) {
2389 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2390 err = -EINVAL;
2391 goto errout;
2392 }
2393
2394 mutex_lock(&chain->filter_chain_lock);
2395 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2396 prio, false);
2397 mutex_unlock(&chain->filter_chain_lock);
2398 if (!tp || IS_ERR(tp)) {
2399 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2400 err = tp ? PTR_ERR(tp) : -ENOENT;
2401 goto errout;
2402 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2403 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2404 err = -EINVAL;
2405 goto errout;
2406 }
2407
2408 fh = tp->ops->get(tp, t->tcm_handle);
2409
2410 if (!fh) {
2411 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2412 err = -ENOENT;
2413 } else {
2414 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2415 fh, RTM_NEWTFILTER, true, rtnl_held);
2416 if (err < 0)
2417 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2418 }
2419
2420 tfilter_put(tp, fh);
2421errout:
2422 if (chain) {
2423 if (tp && !IS_ERR(tp))
2424 tcf_proto_put(tp, rtnl_held, NULL);
2425 tcf_chain_put(chain);
2426 }
2427 tcf_block_release(q, block, rtnl_held);
2428
2429 if (rtnl_held)
2430 rtnl_unlock();
2431
2432 return err;
2433}
2434
2435struct tcf_dump_args {
2436 struct tcf_walker w;
2437 struct sk_buff *skb;
2438 struct netlink_callback *cb;
2439 struct tcf_block *block;
2440 struct Qdisc *q;
2441 u32 parent;
2442};
2443
2444static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2445{
2446 struct tcf_dump_args *a = (void *)arg;
2447 struct net *net = sock_net(a->skb->sk);
2448
2449 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2450 n, NETLINK_CB(a->cb->skb).portid,
2451 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2452 RTM_NEWTFILTER, true);
2453}
2454
2455static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2456 struct sk_buff *skb, struct netlink_callback *cb,
2457 long index_start, long *p_index)
2458{
2459 struct net *net = sock_net(skb->sk);
2460 struct tcf_block *block = chain->block;
2461 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2462 struct tcf_proto *tp, *tp_prev;
2463 struct tcf_dump_args arg;
2464
2465 for (tp = __tcf_get_next_proto(chain, NULL);
2466 tp;
2467 tp_prev = tp,
2468 tp = __tcf_get_next_proto(chain, tp),
2469 tcf_proto_put(tp_prev, true, NULL),
2470 (*p_index)++) {
2471 if (*p_index < index_start)
2472 continue;
2473 if (TC_H_MAJ(tcm->tcm_info) &&
2474 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2475 continue;
2476 if (TC_H_MIN(tcm->tcm_info) &&
2477 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2478 continue;
2479 if (*p_index > index_start)
2480 memset(&cb->args[1], 0,
2481 sizeof(cb->args) - sizeof(cb->args[0]));
2482 if (cb->args[1] == 0) {
2483 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2484 NETLINK_CB(cb->skb).portid,
2485 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2486 RTM_NEWTFILTER, true) <= 0)
2487 goto errout;
2488 cb->args[1] = 1;
2489 }
2490 if (!tp->ops->walk)
2491 continue;
2492 arg.w.fn = tcf_node_dump;
2493 arg.skb = skb;
2494 arg.cb = cb;
2495 arg.block = block;
2496 arg.q = q;
2497 arg.parent = parent;
2498 arg.w.stop = 0;
2499 arg.w.skip = cb->args[1] - 1;
2500 arg.w.count = 0;
2501 arg.w.cookie = cb->args[2];
2502 tp->ops->walk(tp, &arg.w, true);
2503 cb->args[2] = arg.w.cookie;
2504 cb->args[1] = arg.w.count + 1;
2505 if (arg.w.stop)
2506 goto errout;
2507 }
2508 return true;
2509
2510errout:
2511 tcf_proto_put(tp, true, NULL);
2512 return false;
2513}
2514
2515/* called with RTNL */
2516static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2517{
2518 struct tcf_chain *chain, *chain_prev;
2519 struct net *net = sock_net(skb->sk);
2520 struct nlattr *tca[TCA_MAX + 1];
2521 struct Qdisc *q = NULL;
2522 struct tcf_block *block;
2523 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2524 long index_start;
2525 long index;
2526 u32 parent;
2527 int err;
2528
2529 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2530 return skb->len;
2531
2532 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2533 NULL, cb->extack);
2534 if (err)
2535 return err;
2536
2537 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2538 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2539 if (!block)
2540 goto out;
2541 /* If we work with block index, q is NULL and parent value
2542 * will never be used in the following code. The check
2543 * in tcf_fill_node prevents it. However, compiler does not
2544 * see that far, so set parent to zero to silence the warning
2545 * about parent being uninitialized.
2546 */
2547 parent = 0;
2548 } else {
2549 const struct Qdisc_class_ops *cops;
2550 struct net_device *dev;
2551 unsigned long cl = 0;
2552
2553 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2554 if (!dev)
2555 return skb->len;
2556
2557 parent = tcm->tcm_parent;
2558 if (!parent) {
2559 q = dev->qdisc;
2560 parent = q->handle;
2561 } else {
2562 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2563 }
2564 if (!q)
2565 goto out;
2566 cops = q->ops->cl_ops;
2567 if (!cops)
2568 goto out;
2569 if (!cops->tcf_block)
2570 goto out;
2571 if (TC_H_MIN(tcm->tcm_parent)) {
2572 cl = cops->find(q, tcm->tcm_parent);
2573 if (cl == 0)
2574 goto out;
2575 }
2576 block = cops->tcf_block(q, cl, NULL);
2577 if (!block)
2578 goto out;
2579 if (tcf_block_shared(block))
2580 q = NULL;
2581 }
2582
2583 index_start = cb->args[0];
2584 index = 0;
2585
2586 for (chain = __tcf_get_next_chain(block, NULL);
2587 chain;
2588 chain_prev = chain,
2589 chain = __tcf_get_next_chain(block, chain),
2590 tcf_chain_put(chain_prev)) {
2591 if (tca[TCA_CHAIN] &&
2592 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2593 continue;
2594 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2595 index_start, &index)) {
2596 tcf_chain_put(chain);
2597 err = -EMSGSIZE;
2598 break;
2599 }
2600 }
2601
2602 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2603 tcf_block_refcnt_put(block, true);
2604 cb->args[0] = index;
2605
2606out:
2607 /* If we did no progress, the error (EMSGSIZE) is real */
2608 if (skb->len == 0 && err)
2609 return err;
2610 return skb->len;
2611}
2612
2613static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2614 void *tmplt_priv, u32 chain_index,
2615 struct net *net, struct sk_buff *skb,
2616 struct tcf_block *block,
2617 u32 portid, u32 seq, u16 flags, int event)
2618{
2619 unsigned char *b = skb_tail_pointer(skb);
2620 const struct tcf_proto_ops *ops;
2621 struct nlmsghdr *nlh;
2622 struct tcmsg *tcm;
2623 void *priv;
2624
2625 ops = tmplt_ops;
2626 priv = tmplt_priv;
2627
2628 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2629 if (!nlh)
2630 goto out_nlmsg_trim;
2631 tcm = nlmsg_data(nlh);
2632 tcm->tcm_family = AF_UNSPEC;
2633 tcm->tcm__pad1 = 0;
2634 tcm->tcm__pad2 = 0;
2635 tcm->tcm_handle = 0;
2636 if (block->q) {
2637 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2638 tcm->tcm_parent = block->q->handle;
2639 } else {
2640 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2641 tcm->tcm_block_index = block->index;
2642 }
2643
2644 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2645 goto nla_put_failure;
2646
2647 if (ops) {
2648 if (nla_put_string(skb, TCA_KIND, ops->kind))
2649 goto nla_put_failure;
2650 if (ops->tmplt_dump(skb, net, priv) < 0)
2651 goto nla_put_failure;
2652 }
2653
2654 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2655 return skb->len;
2656
2657out_nlmsg_trim:
2658nla_put_failure:
2659 nlmsg_trim(skb, b);
2660 return -EMSGSIZE;
2661}
2662
2663static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2664 u32 seq, u16 flags, int event, bool unicast)
2665{
2666 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2667 struct tcf_block *block = chain->block;
2668 struct net *net = block->net;
2669 struct sk_buff *skb;
2670 int err = 0;
2671
2672 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2673 if (!skb)
2674 return -ENOBUFS;
2675
2676 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2677 chain->index, net, skb, block, portid,
2678 seq, flags, event) <= 0) {
2679 kfree_skb(skb);
2680 return -EINVAL;
2681 }
2682
2683 if (unicast)
2684 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2685 else
2686 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2687 flags & NLM_F_ECHO);
2688
2689 if (err > 0)
2690 err = 0;
2691 return err;
2692}
2693
2694static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2695 void *tmplt_priv, u32 chain_index,
2696 struct tcf_block *block, struct sk_buff *oskb,
2697 u32 seq, u16 flags, bool unicast)
2698{
2699 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2700 struct net *net = block->net;
2701 struct sk_buff *skb;
2702
2703 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2704 if (!skb)
2705 return -ENOBUFS;
2706
2707 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2708 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2709 kfree_skb(skb);
2710 return -EINVAL;
2711 }
2712
2713 if (unicast)
2714 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2715
2716 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2717}
2718
2719static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2720 struct nlattr **tca,
2721 struct netlink_ext_ack *extack)
2722{
2723 const struct tcf_proto_ops *ops;
2724 void *tmplt_priv;
2725
2726 /* If kind is not set, user did not specify template. */
2727 if (!tca[TCA_KIND])
2728 return 0;
2729
2730 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack);
2731 if (IS_ERR(ops))
2732 return PTR_ERR(ops);
2733 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2734 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2735 return -EOPNOTSUPP;
2736 }
2737
2738 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2739 if (IS_ERR(tmplt_priv)) {
2740 module_put(ops->owner);
2741 return PTR_ERR(tmplt_priv);
2742 }
2743 chain->tmplt_ops = ops;
2744 chain->tmplt_priv = tmplt_priv;
2745 return 0;
2746}
2747
2748static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2749 void *tmplt_priv)
2750{
2751 /* If template ops are set, no work to do for us. */
2752 if (!tmplt_ops)
2753 return;
2754
2755 tmplt_ops->tmplt_destroy(tmplt_priv);
2756 module_put(tmplt_ops->owner);
2757}
2758
2759/* Add/delete/get a chain */
2760
2761static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2762 struct netlink_ext_ack *extack)
2763{
2764 struct net *net = sock_net(skb->sk);
2765 struct nlattr *tca[TCA_MAX + 1];
2766 struct tcmsg *t;
2767 u32 parent;
2768 u32 chain_index;
2769 struct Qdisc *q = NULL;
2770 struct tcf_chain *chain = NULL;
2771 struct tcf_block *block;
2772 unsigned long cl;
2773 int err;
2774
2775 if (n->nlmsg_type != RTM_GETCHAIN &&
2776 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2777 return -EPERM;
2778
2779replay:
2780 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2781 rtm_tca_policy, extack);
2782 if (err < 0)
2783 return err;
2784
2785 t = nlmsg_data(n);
2786 parent = t->tcm_parent;
2787 cl = 0;
2788
2789 block = tcf_block_find(net, &q, &parent, &cl,
2790 t->tcm_ifindex, t->tcm_block_index, extack);
2791 if (IS_ERR(block))
2792 return PTR_ERR(block);
2793
2794 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2795 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2796 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2797 err = -EINVAL;
2798 goto errout_block;
2799 }
2800
2801 mutex_lock(&block->lock);
2802 chain = tcf_chain_lookup(block, chain_index);
2803 if (n->nlmsg_type == RTM_NEWCHAIN) {
2804 if (chain) {
2805 if (tcf_chain_held_by_acts_only(chain)) {
2806 /* The chain exists only because there is
2807 * some action referencing it.
2808 */
2809 tcf_chain_hold(chain);
2810 } else {
2811 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2812 err = -EEXIST;
2813 goto errout_block_locked;
2814 }
2815 } else {
2816 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2817 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2818 err = -ENOENT;
2819 goto errout_block_locked;
2820 }
2821 chain = tcf_chain_create(block, chain_index);
2822 if (!chain) {
2823 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2824 err = -ENOMEM;
2825 goto errout_block_locked;
2826 }
2827 }
2828 } else {
2829 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2830 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2831 err = -EINVAL;
2832 goto errout_block_locked;
2833 }
2834 tcf_chain_hold(chain);
2835 }
2836
2837 if (n->nlmsg_type == RTM_NEWCHAIN) {
2838 /* Modifying chain requires holding parent block lock. In case
2839 * the chain was successfully added, take a reference to the
2840 * chain. This ensures that an empty chain does not disappear at
2841 * the end of this function.
2842 */
2843 tcf_chain_hold(chain);
2844 chain->explicitly_created = true;
2845 }
2846 mutex_unlock(&block->lock);
2847
2848 switch (n->nlmsg_type) {
2849 case RTM_NEWCHAIN:
2850 err = tc_chain_tmplt_add(chain, net, tca, extack);
2851 if (err) {
2852 tcf_chain_put_explicitly_created(chain);
2853 goto errout;
2854 }
2855
2856 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2857 RTM_NEWCHAIN, false);
2858 break;
2859 case RTM_DELCHAIN:
2860 tfilter_notify_chain(net, skb, block, q, parent, n,
2861 chain, RTM_DELTFILTER, true);
2862 /* Flush the chain first as the user requested chain removal. */
2863 tcf_chain_flush(chain, true);
2864 /* In case the chain was successfully deleted, put a reference
2865 * to the chain previously taken during addition.
2866 */
2867 tcf_chain_put_explicitly_created(chain);
2868 break;
2869 case RTM_GETCHAIN:
2870 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2871 n->nlmsg_seq, n->nlmsg_type, true);
2872 if (err < 0)
2873 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2874 break;
2875 default:
2876 err = -EOPNOTSUPP;
2877 NL_SET_ERR_MSG(extack, "Unsupported message type");
2878 goto errout;
2879 }
2880
2881errout:
2882 tcf_chain_put(chain);
2883errout_block:
2884 tcf_block_release(q, block, true);
2885 if (err == -EAGAIN)
2886 /* Replay the request. */
2887 goto replay;
2888 return err;
2889
2890errout_block_locked:
2891 mutex_unlock(&block->lock);
2892 goto errout_block;
2893}
2894
2895/* called with RTNL */
2896static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2897{
2898 struct net *net = sock_net(skb->sk);
2899 struct nlattr *tca[TCA_MAX + 1];
2900 struct Qdisc *q = NULL;
2901 struct tcf_block *block;
2902 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2903 struct tcf_chain *chain;
2904 long index_start;
2905 long index;
2906 u32 parent;
2907 int err;
2908
2909 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2910 return skb->len;
2911
2912 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2913 rtm_tca_policy, cb->extack);
2914 if (err)
2915 return err;
2916
2917 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2918 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2919 if (!block)
2920 goto out;
2921 /* If we work with block index, q is NULL and parent value
2922 * will never be used in the following code. The check
2923 * in tcf_fill_node prevents it. However, compiler does not
2924 * see that far, so set parent to zero to silence the warning
2925 * about parent being uninitialized.
2926 */
2927 parent = 0;
2928 } else {
2929 const struct Qdisc_class_ops *cops;
2930 struct net_device *dev;
2931 unsigned long cl = 0;
2932
2933 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2934 if (!dev)
2935 return skb->len;
2936
2937 parent = tcm->tcm_parent;
2938 if (!parent) {
2939 q = dev->qdisc;
2940 parent = q->handle;
2941 } else {
2942 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2943 }
2944 if (!q)
2945 goto out;
2946 cops = q->ops->cl_ops;
2947 if (!cops)
2948 goto out;
2949 if (!cops->tcf_block)
2950 goto out;
2951 if (TC_H_MIN(tcm->tcm_parent)) {
2952 cl = cops->find(q, tcm->tcm_parent);
2953 if (cl == 0)
2954 goto out;
2955 }
2956 block = cops->tcf_block(q, cl, NULL);
2957 if (!block)
2958 goto out;
2959 if (tcf_block_shared(block))
2960 q = NULL;
2961 }
2962
2963 index_start = cb->args[0];
2964 index = 0;
2965
2966 mutex_lock(&block->lock);
2967 list_for_each_entry(chain, &block->chain_list, list) {
2968 if ((tca[TCA_CHAIN] &&
2969 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2970 continue;
2971 if (index < index_start) {
2972 index++;
2973 continue;
2974 }
2975 if (tcf_chain_held_by_acts_only(chain))
2976 continue;
2977 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2978 chain->index, net, skb, block,
2979 NETLINK_CB(cb->skb).portid,
2980 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2981 RTM_NEWCHAIN);
2982 if (err <= 0)
2983 break;
2984 index++;
2985 }
2986 mutex_unlock(&block->lock);
2987
2988 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2989 tcf_block_refcnt_put(block, true);
2990 cb->args[0] = index;
2991
2992out:
2993 /* If we did no progress, the error (EMSGSIZE) is real */
2994 if (skb->len == 0 && err)
2995 return err;
2996 return skb->len;
2997}
2998
2999void tcf_exts_destroy(struct tcf_exts *exts)
3000{
3001#ifdef CONFIG_NET_CLS_ACT
3002 if (exts->actions) {
3003 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3004 kfree(exts->actions);
3005 }
3006 exts->nr_actions = 0;
3007#endif
3008}
3009EXPORT_SYMBOL(tcf_exts_destroy);
3010
3011int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3012 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3013 bool rtnl_held, struct netlink_ext_ack *extack)
3014{
3015#ifdef CONFIG_NET_CLS_ACT
3016 {
3017 struct tc_action *act;
3018 size_t attr_size = 0;
3019
3020 if (exts->police && tb[exts->police]) {
3021 act = tcf_action_init_1(net, tp, tb[exts->police],
3022 rate_tlv, "police", ovr,
3023 TCA_ACT_BIND, rtnl_held,
3024 extack);
3025 if (IS_ERR(act))
3026 return PTR_ERR(act);
3027
3028 act->type = exts->type = TCA_OLD_COMPAT;
3029 exts->actions[0] = act;
3030 exts->nr_actions = 1;
3031 } else if (exts->action && tb[exts->action]) {
3032 int err;
3033
3034 err = tcf_action_init(net, tp, tb[exts->action],
3035 rate_tlv, NULL, ovr, TCA_ACT_BIND,
3036 exts->actions, &attr_size,
3037 rtnl_held, extack);
3038 if (err < 0)
3039 return err;
3040 exts->nr_actions = err;
3041 }
3042 }
3043#else
3044 if ((exts->action && tb[exts->action]) ||
3045 (exts->police && tb[exts->police])) {
3046 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3047 return -EOPNOTSUPP;
3048 }
3049#endif
3050
3051 return 0;
3052}
3053EXPORT_SYMBOL(tcf_exts_validate);
3054
3055void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3056{
3057#ifdef CONFIG_NET_CLS_ACT
3058 struct tcf_exts old = *dst;
3059
3060 *dst = *src;
3061 tcf_exts_destroy(&old);
3062#endif
3063}
3064EXPORT_SYMBOL(tcf_exts_change);
3065
3066#ifdef CONFIG_NET_CLS_ACT
3067static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3068{
3069 if (exts->nr_actions == 0)
3070 return NULL;
3071 else
3072 return exts->actions[0];
3073}
3074#endif
3075
3076int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3077{
3078#ifdef CONFIG_NET_CLS_ACT
3079 struct nlattr *nest;
3080
3081 if (exts->action && tcf_exts_has_actions(exts)) {
3082 /*
3083 * again for backward compatible mode - we want
3084 * to work with both old and new modes of entering
3085 * tc data even if iproute2 was newer - jhs
3086 */
3087 if (exts->type != TCA_OLD_COMPAT) {
3088 nest = nla_nest_start_noflag(skb, exts->action);
3089 if (nest == NULL)
3090 goto nla_put_failure;
3091
3092 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
3093 goto nla_put_failure;
3094 nla_nest_end(skb, nest);
3095 } else if (exts->police) {
3096 struct tc_action *act = tcf_exts_first_act(exts);
3097 nest = nla_nest_start_noflag(skb, exts->police);
3098 if (nest == NULL || !act)
3099 goto nla_put_failure;
3100 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3101 goto nla_put_failure;
3102 nla_nest_end(skb, nest);
3103 }
3104 }
3105 return 0;
3106
3107nla_put_failure:
3108 nla_nest_cancel(skb, nest);
3109 return -1;
3110#else
3111 return 0;
3112#endif
3113}
3114EXPORT_SYMBOL(tcf_exts_dump);
3115
3116
3117int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3118{
3119#ifdef CONFIG_NET_CLS_ACT
3120 struct tc_action *a = tcf_exts_first_act(exts);
3121 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3122 return -1;
3123#endif
3124 return 0;
3125}
3126EXPORT_SYMBOL(tcf_exts_dump_stats);
3127
3128static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
3129{
3130 if (*flags & TCA_CLS_FLAGS_IN_HW)
3131 return;
3132 *flags |= TCA_CLS_FLAGS_IN_HW;
3133 atomic_inc(&block->offloadcnt);
3134}
3135
3136static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
3137{
3138 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
3139 return;
3140 *flags &= ~TCA_CLS_FLAGS_IN_HW;
3141 atomic_dec(&block->offloadcnt);
3142}
3143
3144static void tc_cls_offload_cnt_update(struct tcf_block *block,
3145 struct tcf_proto *tp, u32 *cnt,
3146 u32 *flags, u32 diff, bool add)
3147{
3148 lockdep_assert_held(&block->cb_lock);
3149
3150 spin_lock(&tp->lock);
3151 if (add) {
3152 if (!*cnt)
3153 tcf_block_offload_inc(block, flags);
3154 *cnt += diff;
3155 } else {
3156 *cnt -= diff;
3157 if (!*cnt)
3158 tcf_block_offload_dec(block, flags);
3159 }
3160 spin_unlock(&tp->lock);
3161}
3162
3163static void
3164tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
3165 u32 *cnt, u32 *flags)
3166{
3167 lockdep_assert_held(&block->cb_lock);
3168
3169 spin_lock(&tp->lock);
3170 tcf_block_offload_dec(block, flags);
3171 *cnt = 0;
3172 spin_unlock(&tp->lock);
3173}
3174
3175static int
3176__tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3177 void *type_data, bool err_stop)
3178{
3179 struct flow_block_cb *block_cb;
3180 int ok_count = 0;
3181 int err;
3182
3183 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
3184 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3185 if (err) {
3186 if (err_stop)
3187 return err;
3188 } else {
3189 ok_count++;
3190 }
3191 }
3192 return ok_count;
3193}
3194
3195int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3196 void *type_data, bool err_stop, bool rtnl_held)
3197{
3198 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3199 int ok_count;
3200
3201retry:
3202 if (take_rtnl)
3203 rtnl_lock();
3204 down_read(&block->cb_lock);
3205 /* Need to obtain rtnl lock if block is bound to devs that require it.
3206 * In block bind code cb_lock is obtained while holding rtnl, so we must
3207 * obtain the locks in same order here.
3208 */
3209 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3210 up_read(&block->cb_lock);
3211 take_rtnl = true;
3212 goto retry;
3213 }
3214
3215 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3216
3217 up_read(&block->cb_lock);
3218 if (take_rtnl)
3219 rtnl_unlock();
3220 return ok_count;
3221}
3222EXPORT_SYMBOL(tc_setup_cb_call);
3223
3224/* Non-destructive filter add. If filter that wasn't already in hardware is
3225 * successfully offloaded, increment block offloads counter. On failure,
3226 * previously offloaded filter is considered to be intact and offloads counter
3227 * is not decremented.
3228 */
3229
3230int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
3231 enum tc_setup_type type, void *type_data, bool err_stop,
3232 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3233{
3234 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3235 int ok_count;
3236
3237retry:
3238 if (take_rtnl)
3239 rtnl_lock();
3240 down_read(&block->cb_lock);
3241 /* Need to obtain rtnl lock if block is bound to devs that require it.
3242 * In block bind code cb_lock is obtained while holding rtnl, so we must
3243 * obtain the locks in same order here.
3244 */
3245 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3246 up_read(&block->cb_lock);
3247 take_rtnl = true;
3248 goto retry;
3249 }
3250
3251 /* Make sure all netdevs sharing this block are offload-capable. */
3252 if (block->nooffloaddevcnt && err_stop) {
3253 ok_count = -EOPNOTSUPP;
3254 goto err_unlock;
3255 }
3256
3257 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3258 if (ok_count < 0)
3259 goto err_unlock;
3260
3261 if (tp->ops->hw_add)
3262 tp->ops->hw_add(tp, type_data);
3263 if (ok_count > 0)
3264 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
3265 ok_count, true);
3266err_unlock:
3267 up_read(&block->cb_lock);
3268 if (take_rtnl)
3269 rtnl_unlock();
3270 return ok_count < 0 ? ok_count : 0;
3271}
3272EXPORT_SYMBOL(tc_setup_cb_add);
3273
3274/* Destructive filter replace. If filter that wasn't already in hardware is
3275 * successfully offloaded, increment block offload counter. On failure,
3276 * previously offloaded filter is considered to be destroyed and offload counter
3277 * is decremented.
3278 */
3279
3280int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
3281 enum tc_setup_type type, void *type_data, bool err_stop,
3282 u32 *old_flags, unsigned int *old_in_hw_count,
3283 u32 *new_flags, unsigned int *new_in_hw_count,
3284 bool rtnl_held)
3285{
3286 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3287 int ok_count;
3288
3289retry:
3290 if (take_rtnl)
3291 rtnl_lock();
3292 down_read(&block->cb_lock);
3293 /* Need to obtain rtnl lock if block is bound to devs that require it.
3294 * In block bind code cb_lock is obtained while holding rtnl, so we must
3295 * obtain the locks in same order here.
3296 */
3297 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3298 up_read(&block->cb_lock);
3299 take_rtnl = true;
3300 goto retry;
3301 }
3302
3303 /* Make sure all netdevs sharing this block are offload-capable. */
3304 if (block->nooffloaddevcnt && err_stop) {
3305 ok_count = -EOPNOTSUPP;
3306 goto err_unlock;
3307 }
3308
3309 tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
3310 if (tp->ops->hw_del)
3311 tp->ops->hw_del(tp, type_data);
3312
3313 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3314 if (ok_count < 0)
3315 goto err_unlock;
3316
3317 if (tp->ops->hw_add)
3318 tp->ops->hw_add(tp, type_data);
3319 if (ok_count > 0)
3320 tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
3321 new_flags, ok_count, true);
3322err_unlock:
3323 up_read(&block->cb_lock);
3324 if (take_rtnl)
3325 rtnl_unlock();
3326 return ok_count < 0 ? ok_count : 0;
3327}
3328EXPORT_SYMBOL(tc_setup_cb_replace);
3329
3330/* Destroy filter and decrement block offload counter, if filter was previously
3331 * offloaded.
3332 */
3333
3334int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
3335 enum tc_setup_type type, void *type_data, bool err_stop,
3336 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3337{
3338 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3339 int ok_count;
3340
3341retry:
3342 if (take_rtnl)
3343 rtnl_lock();
3344 down_read(&block->cb_lock);
3345 /* Need to obtain rtnl lock if block is bound to devs that require it.
3346 * In block bind code cb_lock is obtained while holding rtnl, so we must
3347 * obtain the locks in same order here.
3348 */
3349 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3350 up_read(&block->cb_lock);
3351 take_rtnl = true;
3352 goto retry;
3353 }
3354
3355 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3356
3357 tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
3358 if (tp->ops->hw_del)
3359 tp->ops->hw_del(tp, type_data);
3360
3361 up_read(&block->cb_lock);
3362 if (take_rtnl)
3363 rtnl_unlock();
3364 return ok_count < 0 ? ok_count : 0;
3365}
3366EXPORT_SYMBOL(tc_setup_cb_destroy);
3367
3368int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
3369 bool add, flow_setup_cb_t *cb,
3370 enum tc_setup_type type, void *type_data,
3371 void *cb_priv, u32 *flags, unsigned int *in_hw_count)
3372{
3373 int err = cb(type, type_data, cb_priv);
3374
3375 if (err) {
3376 if (add && tc_skip_sw(*flags))
3377 return err;
3378 } else {
3379 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
3380 add);
3381 }
3382
3383 return 0;
3384}
3385EXPORT_SYMBOL(tc_setup_cb_reoffload);
3386
3387void tc_cleanup_flow_action(struct flow_action *flow_action)
3388{
3389 struct flow_action_entry *entry;
3390 int i;
3391
3392 flow_action_for_each(i, entry, flow_action)
3393 if (entry->destructor)
3394 entry->destructor(entry->destructor_priv);
3395}
3396EXPORT_SYMBOL(tc_cleanup_flow_action);
3397
3398static void tcf_mirred_get_dev(struct flow_action_entry *entry,
3399 const struct tc_action *act)
3400{
3401#ifdef CONFIG_NET_CLS_ACT
3402 entry->dev = act->ops->get_dev(act, &entry->destructor);
3403 if (!entry->dev)
3404 return;
3405 entry->destructor_priv = entry->dev;
3406#endif
3407}
3408
3409static void tcf_tunnel_encap_put_tunnel(void *priv)
3410{
3411 struct ip_tunnel_info *tunnel = priv;
3412
3413 kfree(tunnel);
3414}
3415
3416static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry,
3417 const struct tc_action *act)
3418{
3419 entry->tunnel = tcf_tunnel_info_copy(act);
3420 if (!entry->tunnel)
3421 return -ENOMEM;
3422 entry->destructor = tcf_tunnel_encap_put_tunnel;
3423 entry->destructor_priv = entry->tunnel;
3424 return 0;
3425}
3426
3427static void tcf_sample_get_group(struct flow_action_entry *entry,
3428 const struct tc_action *act)
3429{
3430#ifdef CONFIG_NET_CLS_ACT
3431 entry->sample.psample_group =
3432 act->ops->get_psample_group(act, &entry->destructor);
3433 entry->destructor_priv = entry->sample.psample_group;
3434#endif
3435}
3436
3437int tc_setup_flow_action(struct flow_action *flow_action,
3438 const struct tcf_exts *exts, bool rtnl_held)
3439{
3440 const struct tc_action *act;
3441 int i, j, k, err = 0;
3442
3443 if (!exts)
3444 return 0;
3445
3446 if (!rtnl_held)
3447 rtnl_lock();
3448
3449 j = 0;
3450 tcf_exts_for_each_action(i, act, exts) {
3451 struct flow_action_entry *entry;
3452
3453 entry = &flow_action->entries[j];
3454 if (is_tcf_gact_ok(act)) {
3455 entry->id = FLOW_ACTION_ACCEPT;
3456 } else if (is_tcf_gact_shot(act)) {
3457 entry->id = FLOW_ACTION_DROP;
3458 } else if (is_tcf_gact_trap(act)) {
3459 entry->id = FLOW_ACTION_TRAP;
3460 } else if (is_tcf_gact_goto_chain(act)) {
3461 entry->id = FLOW_ACTION_GOTO;
3462 entry->chain_index = tcf_gact_goto_chain_index(act);
3463 } else if (is_tcf_mirred_egress_redirect(act)) {
3464 entry->id = FLOW_ACTION_REDIRECT;
3465 tcf_mirred_get_dev(entry, act);
3466 } else if (is_tcf_mirred_egress_mirror(act)) {
3467 entry->id = FLOW_ACTION_MIRRED;
3468 tcf_mirred_get_dev(entry, act);
3469 } else if (is_tcf_mirred_ingress_redirect(act)) {
3470 entry->id = FLOW_ACTION_REDIRECT_INGRESS;
3471 tcf_mirred_get_dev(entry, act);
3472 } else if (is_tcf_mirred_ingress_mirror(act)) {
3473 entry->id = FLOW_ACTION_MIRRED_INGRESS;
3474 tcf_mirred_get_dev(entry, act);
3475 } else if (is_tcf_vlan(act)) {
3476 switch (tcf_vlan_action(act)) {
3477 case TCA_VLAN_ACT_PUSH:
3478 entry->id = FLOW_ACTION_VLAN_PUSH;
3479 entry->vlan.vid = tcf_vlan_push_vid(act);
3480 entry->vlan.proto = tcf_vlan_push_proto(act);
3481 entry->vlan.prio = tcf_vlan_push_prio(act);
3482 break;
3483 case TCA_VLAN_ACT_POP:
3484 entry->id = FLOW_ACTION_VLAN_POP;
3485 break;
3486 case TCA_VLAN_ACT_MODIFY:
3487 entry->id = FLOW_ACTION_VLAN_MANGLE;
3488 entry->vlan.vid = tcf_vlan_push_vid(act);
3489 entry->vlan.proto = tcf_vlan_push_proto(act);
3490 entry->vlan.prio = tcf_vlan_push_prio(act);
3491 break;
3492 default:
3493 err = -EOPNOTSUPP;
3494 goto err_out;
3495 }
3496 } else if (is_tcf_tunnel_set(act)) {
3497 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3498 err = tcf_tunnel_encap_get_tunnel(entry, act);
3499 if (err)
3500 goto err_out;
3501 } else if (is_tcf_tunnel_release(act)) {
3502 entry->id = FLOW_ACTION_TUNNEL_DECAP;
3503 } else if (is_tcf_pedit(act)) {
3504 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3505 switch (tcf_pedit_cmd(act, k)) {
3506 case TCA_PEDIT_KEY_EX_CMD_SET:
3507 entry->id = FLOW_ACTION_MANGLE;
3508 break;
3509 case TCA_PEDIT_KEY_EX_CMD_ADD:
3510 entry->id = FLOW_ACTION_ADD;
3511 break;
3512 default:
3513 err = -EOPNOTSUPP;
3514 goto err_out;
3515 }
3516 entry->mangle.htype = tcf_pedit_htype(act, k);
3517 entry->mangle.mask = tcf_pedit_mask(act, k);
3518 entry->mangle.val = tcf_pedit_val(act, k);
3519 entry->mangle.offset = tcf_pedit_offset(act, k);
3520 entry = &flow_action->entries[++j];
3521 }
3522 } else if (is_tcf_csum(act)) {
3523 entry->id = FLOW_ACTION_CSUM;
3524 entry->csum_flags = tcf_csum_update_flags(act);
3525 } else if (is_tcf_skbedit_mark(act)) {
3526 entry->id = FLOW_ACTION_MARK;
3527 entry->mark = tcf_skbedit_mark(act);
3528 } else if (is_tcf_sample(act)) {
3529 entry->id = FLOW_ACTION_SAMPLE;
3530 entry->sample.trunc_size = tcf_sample_trunc_size(act);
3531 entry->sample.truncate = tcf_sample_truncate(act);
3532 entry->sample.rate = tcf_sample_rate(act);
3533 tcf_sample_get_group(entry, act);
3534 } else if (is_tcf_police(act)) {
3535 entry->id = FLOW_ACTION_POLICE;
3536 entry->police.burst = tcf_police_tcfp_burst(act);
3537 entry->police.rate_bytes_ps =
3538 tcf_police_rate_bytes_ps(act);
3539 } else if (is_tcf_ct(act)) {
3540 entry->id = FLOW_ACTION_CT;
3541 entry->ct.action = tcf_ct_action(act);
3542 entry->ct.zone = tcf_ct_zone(act);
3543 } else if (is_tcf_mpls(act)) {
3544 switch (tcf_mpls_action(act)) {
3545 case TCA_MPLS_ACT_PUSH:
3546 entry->id = FLOW_ACTION_MPLS_PUSH;
3547 entry->mpls_push.proto = tcf_mpls_proto(act);
3548 entry->mpls_push.label = tcf_mpls_label(act);
3549 entry->mpls_push.tc = tcf_mpls_tc(act);
3550 entry->mpls_push.bos = tcf_mpls_bos(act);
3551 entry->mpls_push.ttl = tcf_mpls_ttl(act);
3552 break;
3553 case TCA_MPLS_ACT_POP:
3554 entry->id = FLOW_ACTION_MPLS_POP;
3555 entry->mpls_pop.proto = tcf_mpls_proto(act);
3556 break;
3557 case TCA_MPLS_ACT_MODIFY:
3558 entry->id = FLOW_ACTION_MPLS_MANGLE;
3559 entry->mpls_mangle.label = tcf_mpls_label(act);
3560 entry->mpls_mangle.tc = tcf_mpls_tc(act);
3561 entry->mpls_mangle.bos = tcf_mpls_bos(act);
3562 entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
3563 break;
3564 default:
3565 goto err_out;
3566 }
3567 } else if (is_tcf_skbedit_ptype(act)) {
3568 entry->id = FLOW_ACTION_PTYPE;
3569 entry->ptype = tcf_skbedit_ptype(act);
3570 } else {
3571 err = -EOPNOTSUPP;
3572 goto err_out;
3573 }
3574
3575 if (!is_tcf_pedit(act))
3576 j++;
3577 }
3578
3579err_out:
3580 if (!rtnl_held)
3581 rtnl_unlock();
3582
3583 if (err)
3584 tc_cleanup_flow_action(flow_action);
3585
3586 return err;
3587}
3588EXPORT_SYMBOL(tc_setup_flow_action);
3589
3590unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3591{
3592 unsigned int num_acts = 0;
3593 struct tc_action *act;
3594 int i;
3595
3596 tcf_exts_for_each_action(i, act, exts) {
3597 if (is_tcf_pedit(act))
3598 num_acts += tcf_pedit_nkeys(act);
3599 else
3600 num_acts++;
3601 }
3602 return num_acts;
3603}
3604EXPORT_SYMBOL(tcf_exts_num_actions);
3605
3606static __net_init int tcf_net_init(struct net *net)
3607{
3608 struct tcf_net *tn = net_generic(net, tcf_net_id);
3609
3610 spin_lock_init(&tn->idr_lock);
3611 idr_init(&tn->idr);
3612 return 0;
3613}
3614
3615static void __net_exit tcf_net_exit(struct net *net)
3616{
3617 struct tcf_net *tn = net_generic(net, tcf_net_id);
3618
3619 idr_destroy(&tn->idr);
3620}
3621
3622static struct pernet_operations tcf_net_ops = {
3623 .init = tcf_net_init,
3624 .exit = tcf_net_exit,
3625 .id = &tcf_net_id,
3626 .size = sizeof(struct tcf_net),
3627};
3628
3629static struct flow_indr_block_ing_entry block_ing_entry = {
3630 .cb = tc_indr_block_get_and_ing_cmd,
3631 .list = LIST_HEAD_INIT(block_ing_entry.list),
3632};
3633
3634static int __init tc_filter_init(void)
3635{
3636 int err;
3637
3638 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3639 if (!tc_filter_wq)
3640 return -ENOMEM;
3641
3642 err = register_pernet_subsys(&tcf_net_ops);
3643 if (err)
3644 goto err_register_pernet_subsys;
3645
3646 flow_indr_add_block_ing_cb(&block_ing_entry);
3647
3648 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3649 RTNL_FLAG_DOIT_UNLOCKED);
3650 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3651 RTNL_FLAG_DOIT_UNLOCKED);
3652 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3653 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3654 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3655 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3656 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3657 tc_dump_chain, 0);
3658
3659 return 0;
3660
3661err_register_pernet_subsys:
3662 destroy_workqueue(tc_filter_wq);
3663 return err;
3664}
3665
3666subsys_initcall(tc_filter_init);
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/jhash.h>
24#include <linux/rculist.h>
25#include <net/net_namespace.h>
26#include <net/sock.h>
27#include <net/netlink.h>
28#include <net/pkt_sched.h>
29#include <net/pkt_cls.h>
30#include <net/tc_act/tc_pedit.h>
31#include <net/tc_act/tc_mirred.h>
32#include <net/tc_act/tc_vlan.h>
33#include <net/tc_act/tc_tunnel_key.h>
34#include <net/tc_act/tc_csum.h>
35#include <net/tc_act/tc_gact.h>
36#include <net/tc_act/tc_police.h>
37#include <net/tc_act/tc_sample.h>
38#include <net/tc_act/tc_skbedit.h>
39#include <net/tc_act/tc_ct.h>
40#include <net/tc_act/tc_mpls.h>
41#include <net/tc_act/tc_gate.h>
42#include <net/flow_offload.h>
43
44extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
45
46/* The list of all installed classifier types */
47static LIST_HEAD(tcf_proto_base);
48
49/* Protects list of registered TC modules. It is pure SMP lock. */
50static DEFINE_RWLOCK(cls_mod_lock);
51
52static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
53{
54 return jhash_3words(tp->chain->index, tp->prio,
55 (__force __u32)tp->protocol, 0);
56}
57
58static void tcf_proto_signal_destroying(struct tcf_chain *chain,
59 struct tcf_proto *tp)
60{
61 struct tcf_block *block = chain->block;
62
63 mutex_lock(&block->proto_destroy_lock);
64 hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
65 destroy_obj_hashfn(tp));
66 mutex_unlock(&block->proto_destroy_lock);
67}
68
69static bool tcf_proto_cmp(const struct tcf_proto *tp1,
70 const struct tcf_proto *tp2)
71{
72 return tp1->chain->index == tp2->chain->index &&
73 tp1->prio == tp2->prio &&
74 tp1->protocol == tp2->protocol;
75}
76
77static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
78 struct tcf_proto *tp)
79{
80 u32 hash = destroy_obj_hashfn(tp);
81 struct tcf_proto *iter;
82 bool found = false;
83
84 rcu_read_lock();
85 hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
86 destroy_ht_node, hash) {
87 if (tcf_proto_cmp(tp, iter)) {
88 found = true;
89 break;
90 }
91 }
92 rcu_read_unlock();
93
94 return found;
95}
96
97static void
98tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
99{
100 struct tcf_block *block = chain->block;
101
102 mutex_lock(&block->proto_destroy_lock);
103 if (hash_hashed(&tp->destroy_ht_node))
104 hash_del_rcu(&tp->destroy_ht_node);
105 mutex_unlock(&block->proto_destroy_lock);
106}
107
108/* Find classifier type by string name */
109
110static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
111{
112 const struct tcf_proto_ops *t, *res = NULL;
113
114 if (kind) {
115 read_lock(&cls_mod_lock);
116 list_for_each_entry(t, &tcf_proto_base, head) {
117 if (strcmp(kind, t->kind) == 0) {
118 if (try_module_get(t->owner))
119 res = t;
120 break;
121 }
122 }
123 read_unlock(&cls_mod_lock);
124 }
125 return res;
126}
127
128static const struct tcf_proto_ops *
129tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
130 struct netlink_ext_ack *extack)
131{
132 const struct tcf_proto_ops *ops;
133
134 ops = __tcf_proto_lookup_ops(kind);
135 if (ops)
136 return ops;
137#ifdef CONFIG_MODULES
138 if (rtnl_held)
139 rtnl_unlock();
140 request_module("cls_%s", kind);
141 if (rtnl_held)
142 rtnl_lock();
143 ops = __tcf_proto_lookup_ops(kind);
144 /* We dropped the RTNL semaphore in order to perform
145 * the module load. So, even if we succeeded in loading
146 * the module we have to replay the request. We indicate
147 * this using -EAGAIN.
148 */
149 if (ops) {
150 module_put(ops->owner);
151 return ERR_PTR(-EAGAIN);
152 }
153#endif
154 NL_SET_ERR_MSG(extack, "TC classifier not found");
155 return ERR_PTR(-ENOENT);
156}
157
158/* Register(unregister) new classifier type */
159
160int register_tcf_proto_ops(struct tcf_proto_ops *ops)
161{
162 struct tcf_proto_ops *t;
163 int rc = -EEXIST;
164
165 write_lock(&cls_mod_lock);
166 list_for_each_entry(t, &tcf_proto_base, head)
167 if (!strcmp(ops->kind, t->kind))
168 goto out;
169
170 list_add_tail(&ops->head, &tcf_proto_base);
171 rc = 0;
172out:
173 write_unlock(&cls_mod_lock);
174 return rc;
175}
176EXPORT_SYMBOL(register_tcf_proto_ops);
177
178static struct workqueue_struct *tc_filter_wq;
179
180int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
181{
182 struct tcf_proto_ops *t;
183 int rc = -ENOENT;
184
185 /* Wait for outstanding call_rcu()s, if any, from a
186 * tcf_proto_ops's destroy() handler.
187 */
188 rcu_barrier();
189 flush_workqueue(tc_filter_wq);
190
191 write_lock(&cls_mod_lock);
192 list_for_each_entry(t, &tcf_proto_base, head) {
193 if (t == ops) {
194 list_del(&t->head);
195 rc = 0;
196 break;
197 }
198 }
199 write_unlock(&cls_mod_lock);
200 return rc;
201}
202EXPORT_SYMBOL(unregister_tcf_proto_ops);
203
204bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
205{
206 INIT_RCU_WORK(rwork, func);
207 return queue_rcu_work(tc_filter_wq, rwork);
208}
209EXPORT_SYMBOL(tcf_queue_work);
210
211/* Select new prio value from the range, managed by kernel. */
212
213static inline u32 tcf_auto_prio(struct tcf_proto *tp)
214{
215 u32 first = TC_H_MAKE(0xC0000000U, 0U);
216
217 if (tp)
218 first = tp->prio - 1;
219
220 return TC_H_MAJ(first);
221}
222
223static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
224{
225 if (kind)
226 return nla_strlcpy(name, kind, IFNAMSIZ) >= IFNAMSIZ;
227 memset(name, 0, IFNAMSIZ);
228 return false;
229}
230
231static bool tcf_proto_is_unlocked(const char *kind)
232{
233 const struct tcf_proto_ops *ops;
234 bool ret;
235
236 if (strlen(kind) == 0)
237 return false;
238
239 ops = tcf_proto_lookup_ops(kind, false, NULL);
240 /* On error return false to take rtnl lock. Proto lookup/create
241 * functions will perform lookup again and properly handle errors.
242 */
243 if (IS_ERR(ops))
244 return false;
245
246 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
247 module_put(ops->owner);
248 return ret;
249}
250
251static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
252 u32 prio, struct tcf_chain *chain,
253 bool rtnl_held,
254 struct netlink_ext_ack *extack)
255{
256 struct tcf_proto *tp;
257 int err;
258
259 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
260 if (!tp)
261 return ERR_PTR(-ENOBUFS);
262
263 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
264 if (IS_ERR(tp->ops)) {
265 err = PTR_ERR(tp->ops);
266 goto errout;
267 }
268 tp->classify = tp->ops->classify;
269 tp->protocol = protocol;
270 tp->prio = prio;
271 tp->chain = chain;
272 spin_lock_init(&tp->lock);
273 refcount_set(&tp->refcnt, 1);
274
275 err = tp->ops->init(tp);
276 if (err) {
277 module_put(tp->ops->owner);
278 goto errout;
279 }
280 return tp;
281
282errout:
283 kfree(tp);
284 return ERR_PTR(err);
285}
286
287static void tcf_proto_get(struct tcf_proto *tp)
288{
289 refcount_inc(&tp->refcnt);
290}
291
292static void tcf_chain_put(struct tcf_chain *chain);
293
294static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
295 bool sig_destroy, struct netlink_ext_ack *extack)
296{
297 tp->ops->destroy(tp, rtnl_held, extack);
298 if (sig_destroy)
299 tcf_proto_signal_destroyed(tp->chain, tp);
300 tcf_chain_put(tp->chain);
301 module_put(tp->ops->owner);
302 kfree_rcu(tp, rcu);
303}
304
305static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
306 struct netlink_ext_ack *extack)
307{
308 if (refcount_dec_and_test(&tp->refcnt))
309 tcf_proto_destroy(tp, rtnl_held, true, extack);
310}
311
312static bool tcf_proto_check_delete(struct tcf_proto *tp)
313{
314 if (tp->ops->delete_empty)
315 return tp->ops->delete_empty(tp);
316
317 tp->deleting = true;
318 return tp->deleting;
319}
320
321static void tcf_proto_mark_delete(struct tcf_proto *tp)
322{
323 spin_lock(&tp->lock);
324 tp->deleting = true;
325 spin_unlock(&tp->lock);
326}
327
328static bool tcf_proto_is_deleting(struct tcf_proto *tp)
329{
330 bool deleting;
331
332 spin_lock(&tp->lock);
333 deleting = tp->deleting;
334 spin_unlock(&tp->lock);
335
336 return deleting;
337}
338
339#define ASSERT_BLOCK_LOCKED(block) \
340 lockdep_assert_held(&(block)->lock)
341
342struct tcf_filter_chain_list_item {
343 struct list_head list;
344 tcf_chain_head_change_t *chain_head_change;
345 void *chain_head_change_priv;
346};
347
348static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
349 u32 chain_index)
350{
351 struct tcf_chain *chain;
352
353 ASSERT_BLOCK_LOCKED(block);
354
355 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
356 if (!chain)
357 return NULL;
358 list_add_tail_rcu(&chain->list, &block->chain_list);
359 mutex_init(&chain->filter_chain_lock);
360 chain->block = block;
361 chain->index = chain_index;
362 chain->refcnt = 1;
363 if (!chain->index)
364 block->chain0.chain = chain;
365 return chain;
366}
367
368static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
369 struct tcf_proto *tp_head)
370{
371 if (item->chain_head_change)
372 item->chain_head_change(tp_head, item->chain_head_change_priv);
373}
374
375static void tcf_chain0_head_change(struct tcf_chain *chain,
376 struct tcf_proto *tp_head)
377{
378 struct tcf_filter_chain_list_item *item;
379 struct tcf_block *block = chain->block;
380
381 if (chain->index)
382 return;
383
384 mutex_lock(&block->lock);
385 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
386 tcf_chain_head_change_item(item, tp_head);
387 mutex_unlock(&block->lock);
388}
389
390/* Returns true if block can be safely freed. */
391
392static bool tcf_chain_detach(struct tcf_chain *chain)
393{
394 struct tcf_block *block = chain->block;
395
396 ASSERT_BLOCK_LOCKED(block);
397
398 list_del_rcu(&chain->list);
399 if (!chain->index)
400 block->chain0.chain = NULL;
401
402 if (list_empty(&block->chain_list) &&
403 refcount_read(&block->refcnt) == 0)
404 return true;
405
406 return false;
407}
408
409static void tcf_block_destroy(struct tcf_block *block)
410{
411 mutex_destroy(&block->lock);
412 mutex_destroy(&block->proto_destroy_lock);
413 kfree_rcu(block, rcu);
414}
415
416static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
417{
418 struct tcf_block *block = chain->block;
419
420 mutex_destroy(&chain->filter_chain_lock);
421 kfree_rcu(chain, rcu);
422 if (free_block)
423 tcf_block_destroy(block);
424}
425
426static void tcf_chain_hold(struct tcf_chain *chain)
427{
428 ASSERT_BLOCK_LOCKED(chain->block);
429
430 ++chain->refcnt;
431}
432
433static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
434{
435 ASSERT_BLOCK_LOCKED(chain->block);
436
437 /* In case all the references are action references, this
438 * chain should not be shown to the user.
439 */
440 return chain->refcnt == chain->action_refcnt;
441}
442
443static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
444 u32 chain_index)
445{
446 struct tcf_chain *chain;
447
448 ASSERT_BLOCK_LOCKED(block);
449
450 list_for_each_entry(chain, &block->chain_list, list) {
451 if (chain->index == chain_index)
452 return chain;
453 }
454 return NULL;
455}
456
457#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
458static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block,
459 u32 chain_index)
460{
461 struct tcf_chain *chain;
462
463 list_for_each_entry_rcu(chain, &block->chain_list, list) {
464 if (chain->index == chain_index)
465 return chain;
466 }
467 return NULL;
468}
469#endif
470
471static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
472 u32 seq, u16 flags, int event, bool unicast);
473
474static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
475 u32 chain_index, bool create,
476 bool by_act)
477{
478 struct tcf_chain *chain = NULL;
479 bool is_first_reference;
480
481 mutex_lock(&block->lock);
482 chain = tcf_chain_lookup(block, chain_index);
483 if (chain) {
484 tcf_chain_hold(chain);
485 } else {
486 if (!create)
487 goto errout;
488 chain = tcf_chain_create(block, chain_index);
489 if (!chain)
490 goto errout;
491 }
492
493 if (by_act)
494 ++chain->action_refcnt;
495 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
496 mutex_unlock(&block->lock);
497
498 /* Send notification only in case we got the first
499 * non-action reference. Until then, the chain acts only as
500 * a placeholder for actions pointing to it and user ought
501 * not know about them.
502 */
503 if (is_first_reference && !by_act)
504 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
505 RTM_NEWCHAIN, false);
506
507 return chain;
508
509errout:
510 mutex_unlock(&block->lock);
511 return chain;
512}
513
514static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
515 bool create)
516{
517 return __tcf_chain_get(block, chain_index, create, false);
518}
519
520struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
521{
522 return __tcf_chain_get(block, chain_index, true, true);
523}
524EXPORT_SYMBOL(tcf_chain_get_by_act);
525
526static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
527 void *tmplt_priv);
528static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
529 void *tmplt_priv, u32 chain_index,
530 struct tcf_block *block, struct sk_buff *oskb,
531 u32 seq, u16 flags, bool unicast);
532
533static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
534 bool explicitly_created)
535{
536 struct tcf_block *block = chain->block;
537 const struct tcf_proto_ops *tmplt_ops;
538 bool free_block = false;
539 unsigned int refcnt;
540 void *tmplt_priv;
541
542 mutex_lock(&block->lock);
543 if (explicitly_created) {
544 if (!chain->explicitly_created) {
545 mutex_unlock(&block->lock);
546 return;
547 }
548 chain->explicitly_created = false;
549 }
550
551 if (by_act)
552 chain->action_refcnt--;
553
554 /* tc_chain_notify_delete can't be called while holding block lock.
555 * However, when block is unlocked chain can be changed concurrently, so
556 * save these to temporary variables.
557 */
558 refcnt = --chain->refcnt;
559 tmplt_ops = chain->tmplt_ops;
560 tmplt_priv = chain->tmplt_priv;
561
562 /* The last dropped non-action reference will trigger notification. */
563 if (refcnt - chain->action_refcnt == 0 && !by_act) {
564 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
565 block, NULL, 0, 0, false);
566 /* Last reference to chain, no need to lock. */
567 chain->flushing = false;
568 }
569
570 if (refcnt == 0)
571 free_block = tcf_chain_detach(chain);
572 mutex_unlock(&block->lock);
573
574 if (refcnt == 0) {
575 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
576 tcf_chain_destroy(chain, free_block);
577 }
578}
579
580static void tcf_chain_put(struct tcf_chain *chain)
581{
582 __tcf_chain_put(chain, false, false);
583}
584
585void tcf_chain_put_by_act(struct tcf_chain *chain)
586{
587 __tcf_chain_put(chain, true, false);
588}
589EXPORT_SYMBOL(tcf_chain_put_by_act);
590
591static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
592{
593 __tcf_chain_put(chain, false, true);
594}
595
596static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
597{
598 struct tcf_proto *tp, *tp_next;
599
600 mutex_lock(&chain->filter_chain_lock);
601 tp = tcf_chain_dereference(chain->filter_chain, chain);
602 while (tp) {
603 tp_next = rcu_dereference_protected(tp->next, 1);
604 tcf_proto_signal_destroying(chain, tp);
605 tp = tp_next;
606 }
607 tp = tcf_chain_dereference(chain->filter_chain, chain);
608 RCU_INIT_POINTER(chain->filter_chain, NULL);
609 tcf_chain0_head_change(chain, NULL);
610 chain->flushing = true;
611 mutex_unlock(&chain->filter_chain_lock);
612
613 while (tp) {
614 tp_next = rcu_dereference_protected(tp->next, 1);
615 tcf_proto_put(tp, rtnl_held, NULL);
616 tp = tp_next;
617 }
618}
619
620static int tcf_block_setup(struct tcf_block *block,
621 struct flow_block_offload *bo);
622
623static void tcf_block_offload_init(struct flow_block_offload *bo,
624 struct net_device *dev, struct Qdisc *sch,
625 enum flow_block_command command,
626 enum flow_block_binder_type binder_type,
627 struct flow_block *flow_block,
628 bool shared, struct netlink_ext_ack *extack)
629{
630 bo->net = dev_net(dev);
631 bo->command = command;
632 bo->binder_type = binder_type;
633 bo->block = flow_block;
634 bo->block_shared = shared;
635 bo->extack = extack;
636 bo->sch = sch;
637 INIT_LIST_HEAD(&bo->cb_list);
638}
639
640static void tcf_block_unbind(struct tcf_block *block,
641 struct flow_block_offload *bo);
642
643static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
644{
645 struct tcf_block *block = block_cb->indr.data;
646 struct net_device *dev = block_cb->indr.dev;
647 struct Qdisc *sch = block_cb->indr.sch;
648 struct netlink_ext_ack extack = {};
649 struct flow_block_offload bo;
650
651 tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND,
652 block_cb->indr.binder_type,
653 &block->flow_block, tcf_block_shared(block),
654 &extack);
655 down_write(&block->cb_lock);
656 list_del(&block_cb->driver_list);
657 list_move(&block_cb->list, &bo.cb_list);
658 up_write(&block->cb_lock);
659 rtnl_lock();
660 tcf_block_unbind(block, &bo);
661 rtnl_unlock();
662}
663
664static bool tcf_block_offload_in_use(struct tcf_block *block)
665{
666 return atomic_read(&block->offloadcnt);
667}
668
669static int tcf_block_offload_cmd(struct tcf_block *block,
670 struct net_device *dev, struct Qdisc *sch,
671 struct tcf_block_ext_info *ei,
672 enum flow_block_command command,
673 struct netlink_ext_ack *extack)
674{
675 struct flow_block_offload bo = {};
676
677 tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type,
678 &block->flow_block, tcf_block_shared(block),
679 extack);
680
681 if (dev->netdev_ops->ndo_setup_tc) {
682 int err;
683
684 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
685 if (err < 0) {
686 if (err != -EOPNOTSUPP)
687 NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
688 return err;
689 }
690
691 return tcf_block_setup(block, &bo);
692 }
693
694 flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo,
695 tc_block_indr_cleanup);
696 tcf_block_setup(block, &bo);
697
698 return -EOPNOTSUPP;
699}
700
701static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
702 struct tcf_block_ext_info *ei,
703 struct netlink_ext_ack *extack)
704{
705 struct net_device *dev = q->dev_queue->dev;
706 int err;
707
708 down_write(&block->cb_lock);
709
710 /* If tc offload feature is disabled and the block we try to bind
711 * to already has some offloaded filters, forbid to bind.
712 */
713 if (dev->netdev_ops->ndo_setup_tc &&
714 !tc_can_offload(dev) &&
715 tcf_block_offload_in_use(block)) {
716 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
717 err = -EOPNOTSUPP;
718 goto err_unlock;
719 }
720
721 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack);
722 if (err == -EOPNOTSUPP)
723 goto no_offload_dev_inc;
724 if (err)
725 goto err_unlock;
726
727 up_write(&block->cb_lock);
728 return 0;
729
730no_offload_dev_inc:
731 if (tcf_block_offload_in_use(block))
732 goto err_unlock;
733
734 err = 0;
735 block->nooffloaddevcnt++;
736err_unlock:
737 up_write(&block->cb_lock);
738 return err;
739}
740
741static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
742 struct tcf_block_ext_info *ei)
743{
744 struct net_device *dev = q->dev_queue->dev;
745 int err;
746
747 down_write(&block->cb_lock);
748 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL);
749 if (err == -EOPNOTSUPP)
750 goto no_offload_dev_dec;
751 up_write(&block->cb_lock);
752 return;
753
754no_offload_dev_dec:
755 WARN_ON(block->nooffloaddevcnt-- == 0);
756 up_write(&block->cb_lock);
757}
758
759static int
760tcf_chain0_head_change_cb_add(struct tcf_block *block,
761 struct tcf_block_ext_info *ei,
762 struct netlink_ext_ack *extack)
763{
764 struct tcf_filter_chain_list_item *item;
765 struct tcf_chain *chain0;
766
767 item = kmalloc(sizeof(*item), GFP_KERNEL);
768 if (!item) {
769 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
770 return -ENOMEM;
771 }
772 item->chain_head_change = ei->chain_head_change;
773 item->chain_head_change_priv = ei->chain_head_change_priv;
774
775 mutex_lock(&block->lock);
776 chain0 = block->chain0.chain;
777 if (chain0)
778 tcf_chain_hold(chain0);
779 else
780 list_add(&item->list, &block->chain0.filter_chain_list);
781 mutex_unlock(&block->lock);
782
783 if (chain0) {
784 struct tcf_proto *tp_head;
785
786 mutex_lock(&chain0->filter_chain_lock);
787
788 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
789 if (tp_head)
790 tcf_chain_head_change_item(item, tp_head);
791
792 mutex_lock(&block->lock);
793 list_add(&item->list, &block->chain0.filter_chain_list);
794 mutex_unlock(&block->lock);
795
796 mutex_unlock(&chain0->filter_chain_lock);
797 tcf_chain_put(chain0);
798 }
799
800 return 0;
801}
802
803static void
804tcf_chain0_head_change_cb_del(struct tcf_block *block,
805 struct tcf_block_ext_info *ei)
806{
807 struct tcf_filter_chain_list_item *item;
808
809 mutex_lock(&block->lock);
810 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
811 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
812 (item->chain_head_change == ei->chain_head_change &&
813 item->chain_head_change_priv == ei->chain_head_change_priv)) {
814 if (block->chain0.chain)
815 tcf_chain_head_change_item(item, NULL);
816 list_del(&item->list);
817 mutex_unlock(&block->lock);
818
819 kfree(item);
820 return;
821 }
822 }
823 mutex_unlock(&block->lock);
824 WARN_ON(1);
825}
826
827struct tcf_net {
828 spinlock_t idr_lock; /* Protects idr */
829 struct idr idr;
830};
831
832static unsigned int tcf_net_id;
833
834static int tcf_block_insert(struct tcf_block *block, struct net *net,
835 struct netlink_ext_ack *extack)
836{
837 struct tcf_net *tn = net_generic(net, tcf_net_id);
838 int err;
839
840 idr_preload(GFP_KERNEL);
841 spin_lock(&tn->idr_lock);
842 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
843 GFP_NOWAIT);
844 spin_unlock(&tn->idr_lock);
845 idr_preload_end();
846
847 return err;
848}
849
850static void tcf_block_remove(struct tcf_block *block, struct net *net)
851{
852 struct tcf_net *tn = net_generic(net, tcf_net_id);
853
854 spin_lock(&tn->idr_lock);
855 idr_remove(&tn->idr, block->index);
856 spin_unlock(&tn->idr_lock);
857}
858
859static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
860 u32 block_index,
861 struct netlink_ext_ack *extack)
862{
863 struct tcf_block *block;
864
865 block = kzalloc(sizeof(*block), GFP_KERNEL);
866 if (!block) {
867 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
868 return ERR_PTR(-ENOMEM);
869 }
870 mutex_init(&block->lock);
871 mutex_init(&block->proto_destroy_lock);
872 init_rwsem(&block->cb_lock);
873 flow_block_init(&block->flow_block);
874 INIT_LIST_HEAD(&block->chain_list);
875 INIT_LIST_HEAD(&block->owner_list);
876 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
877
878 refcount_set(&block->refcnt, 1);
879 block->net = net;
880 block->index = block_index;
881
882 /* Don't store q pointer for blocks which are shared */
883 if (!tcf_block_shared(block))
884 block->q = q;
885 return block;
886}
887
888static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
889{
890 struct tcf_net *tn = net_generic(net, tcf_net_id);
891
892 return idr_find(&tn->idr, block_index);
893}
894
895static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
896{
897 struct tcf_block *block;
898
899 rcu_read_lock();
900 block = tcf_block_lookup(net, block_index);
901 if (block && !refcount_inc_not_zero(&block->refcnt))
902 block = NULL;
903 rcu_read_unlock();
904
905 return block;
906}
907
908static struct tcf_chain *
909__tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
910{
911 mutex_lock(&block->lock);
912 if (chain)
913 chain = list_is_last(&chain->list, &block->chain_list) ?
914 NULL : list_next_entry(chain, list);
915 else
916 chain = list_first_entry_or_null(&block->chain_list,
917 struct tcf_chain, list);
918
919 /* skip all action-only chains */
920 while (chain && tcf_chain_held_by_acts_only(chain))
921 chain = list_is_last(&chain->list, &block->chain_list) ?
922 NULL : list_next_entry(chain, list);
923
924 if (chain)
925 tcf_chain_hold(chain);
926 mutex_unlock(&block->lock);
927
928 return chain;
929}
930
931/* Function to be used by all clients that want to iterate over all chains on
932 * block. It properly obtains block->lock and takes reference to chain before
933 * returning it. Users of this function must be tolerant to concurrent chain
934 * insertion/deletion or ensure that no concurrent chain modification is
935 * possible. Note that all netlink dump callbacks cannot guarantee to provide
936 * consistent dump because rtnl lock is released each time skb is filled with
937 * data and sent to user-space.
938 */
939
940struct tcf_chain *
941tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
942{
943 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
944
945 if (chain)
946 tcf_chain_put(chain);
947
948 return chain_next;
949}
950EXPORT_SYMBOL(tcf_get_next_chain);
951
952static struct tcf_proto *
953__tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
954{
955 u32 prio = 0;
956
957 ASSERT_RTNL();
958 mutex_lock(&chain->filter_chain_lock);
959
960 if (!tp) {
961 tp = tcf_chain_dereference(chain->filter_chain, chain);
962 } else if (tcf_proto_is_deleting(tp)) {
963 /* 'deleting' flag is set and chain->filter_chain_lock was
964 * unlocked, which means next pointer could be invalid. Restart
965 * search.
966 */
967 prio = tp->prio + 1;
968 tp = tcf_chain_dereference(chain->filter_chain, chain);
969
970 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
971 if (!tp->deleting && tp->prio >= prio)
972 break;
973 } else {
974 tp = tcf_chain_dereference(tp->next, chain);
975 }
976
977 if (tp)
978 tcf_proto_get(tp);
979
980 mutex_unlock(&chain->filter_chain_lock);
981
982 return tp;
983}
984
985/* Function to be used by all clients that want to iterate over all tp's on
986 * chain. Users of this function must be tolerant to concurrent tp
987 * insertion/deletion or ensure that no concurrent chain modification is
988 * possible. Note that all netlink dump callbacks cannot guarantee to provide
989 * consistent dump because rtnl lock is released each time skb is filled with
990 * data and sent to user-space.
991 */
992
993struct tcf_proto *
994tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
995 bool rtnl_held)
996{
997 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
998
999 if (tp)
1000 tcf_proto_put(tp, rtnl_held, NULL);
1001
1002 return tp_next;
1003}
1004EXPORT_SYMBOL(tcf_get_next_proto);
1005
1006static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1007{
1008 struct tcf_chain *chain;
1009
1010 /* Last reference to block. At this point chains cannot be added or
1011 * removed concurrently.
1012 */
1013 for (chain = tcf_get_next_chain(block, NULL);
1014 chain;
1015 chain = tcf_get_next_chain(block, chain)) {
1016 tcf_chain_put_explicitly_created(chain);
1017 tcf_chain_flush(chain, rtnl_held);
1018 }
1019}
1020
1021/* Lookup Qdisc and increments its reference counter.
1022 * Set parent, if necessary.
1023 */
1024
1025static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1026 u32 *parent, int ifindex, bool rtnl_held,
1027 struct netlink_ext_ack *extack)
1028{
1029 const struct Qdisc_class_ops *cops;
1030 struct net_device *dev;
1031 int err = 0;
1032
1033 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1034 return 0;
1035
1036 rcu_read_lock();
1037
1038 /* Find link */
1039 dev = dev_get_by_index_rcu(net, ifindex);
1040 if (!dev) {
1041 rcu_read_unlock();
1042 return -ENODEV;
1043 }
1044
1045 /* Find qdisc */
1046 if (!*parent) {
1047 *q = dev->qdisc;
1048 *parent = (*q)->handle;
1049 } else {
1050 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1051 if (!*q) {
1052 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1053 err = -EINVAL;
1054 goto errout_rcu;
1055 }
1056 }
1057
1058 *q = qdisc_refcount_inc_nz(*q);
1059 if (!*q) {
1060 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1061 err = -EINVAL;
1062 goto errout_rcu;
1063 }
1064
1065 /* Is it classful? */
1066 cops = (*q)->ops->cl_ops;
1067 if (!cops) {
1068 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1069 err = -EINVAL;
1070 goto errout_qdisc;
1071 }
1072
1073 if (!cops->tcf_block) {
1074 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1075 err = -EOPNOTSUPP;
1076 goto errout_qdisc;
1077 }
1078
1079errout_rcu:
1080 /* At this point we know that qdisc is not noop_qdisc,
1081 * which means that qdisc holds a reference to net_device
1082 * and we hold a reference to qdisc, so it is safe to release
1083 * rcu read lock.
1084 */
1085 rcu_read_unlock();
1086 return err;
1087
1088errout_qdisc:
1089 rcu_read_unlock();
1090
1091 if (rtnl_held)
1092 qdisc_put(*q);
1093 else
1094 qdisc_put_unlocked(*q);
1095 *q = NULL;
1096
1097 return err;
1098}
1099
1100static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1101 int ifindex, struct netlink_ext_ack *extack)
1102{
1103 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1104 return 0;
1105
1106 /* Do we search for filter, attached to class? */
1107 if (TC_H_MIN(parent)) {
1108 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1109
1110 *cl = cops->find(q, parent);
1111 if (*cl == 0) {
1112 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1113 return -ENOENT;
1114 }
1115 }
1116
1117 return 0;
1118}
1119
1120static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1121 unsigned long cl, int ifindex,
1122 u32 block_index,
1123 struct netlink_ext_ack *extack)
1124{
1125 struct tcf_block *block;
1126
1127 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1128 block = tcf_block_refcnt_get(net, block_index);
1129 if (!block) {
1130 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1131 return ERR_PTR(-EINVAL);
1132 }
1133 } else {
1134 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1135
1136 block = cops->tcf_block(q, cl, extack);
1137 if (!block)
1138 return ERR_PTR(-EINVAL);
1139
1140 if (tcf_block_shared(block)) {
1141 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1142 return ERR_PTR(-EOPNOTSUPP);
1143 }
1144
1145 /* Always take reference to block in order to support execution
1146 * of rules update path of cls API without rtnl lock. Caller
1147 * must release block when it is finished using it. 'if' block
1148 * of this conditional obtain reference to block by calling
1149 * tcf_block_refcnt_get().
1150 */
1151 refcount_inc(&block->refcnt);
1152 }
1153
1154 return block;
1155}
1156
1157static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1158 struct tcf_block_ext_info *ei, bool rtnl_held)
1159{
1160 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1161 /* Flushing/putting all chains will cause the block to be
1162 * deallocated when last chain is freed. However, if chain_list
1163 * is empty, block has to be manually deallocated. After block
1164 * reference counter reached 0, it is no longer possible to
1165 * increment it or add new chains to block.
1166 */
1167 bool free_block = list_empty(&block->chain_list);
1168
1169 mutex_unlock(&block->lock);
1170 if (tcf_block_shared(block))
1171 tcf_block_remove(block, block->net);
1172
1173 if (q)
1174 tcf_block_offload_unbind(block, q, ei);
1175
1176 if (free_block)
1177 tcf_block_destroy(block);
1178 else
1179 tcf_block_flush_all_chains(block, rtnl_held);
1180 } else if (q) {
1181 tcf_block_offload_unbind(block, q, ei);
1182 }
1183}
1184
1185static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1186{
1187 __tcf_block_put(block, NULL, NULL, rtnl_held);
1188}
1189
1190/* Find tcf block.
1191 * Set q, parent, cl when appropriate.
1192 */
1193
1194static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1195 u32 *parent, unsigned long *cl,
1196 int ifindex, u32 block_index,
1197 struct netlink_ext_ack *extack)
1198{
1199 struct tcf_block *block;
1200 int err = 0;
1201
1202 ASSERT_RTNL();
1203
1204 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1205 if (err)
1206 goto errout;
1207
1208 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1209 if (err)
1210 goto errout_qdisc;
1211
1212 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1213 if (IS_ERR(block)) {
1214 err = PTR_ERR(block);
1215 goto errout_qdisc;
1216 }
1217
1218 return block;
1219
1220errout_qdisc:
1221 if (*q)
1222 qdisc_put(*q);
1223errout:
1224 *q = NULL;
1225 return ERR_PTR(err);
1226}
1227
1228static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1229 bool rtnl_held)
1230{
1231 if (!IS_ERR_OR_NULL(block))
1232 tcf_block_refcnt_put(block, rtnl_held);
1233
1234 if (q) {
1235 if (rtnl_held)
1236 qdisc_put(q);
1237 else
1238 qdisc_put_unlocked(q);
1239 }
1240}
1241
1242struct tcf_block_owner_item {
1243 struct list_head list;
1244 struct Qdisc *q;
1245 enum flow_block_binder_type binder_type;
1246};
1247
1248static void
1249tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1250 struct Qdisc *q,
1251 enum flow_block_binder_type binder_type)
1252{
1253 if (block->keep_dst &&
1254 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1255 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1256 netif_keep_dst(qdisc_dev(q));
1257}
1258
1259void tcf_block_netif_keep_dst(struct tcf_block *block)
1260{
1261 struct tcf_block_owner_item *item;
1262
1263 block->keep_dst = true;
1264 list_for_each_entry(item, &block->owner_list, list)
1265 tcf_block_owner_netif_keep_dst(block, item->q,
1266 item->binder_type);
1267}
1268EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1269
1270static int tcf_block_owner_add(struct tcf_block *block,
1271 struct Qdisc *q,
1272 enum flow_block_binder_type binder_type)
1273{
1274 struct tcf_block_owner_item *item;
1275
1276 item = kmalloc(sizeof(*item), GFP_KERNEL);
1277 if (!item)
1278 return -ENOMEM;
1279 item->q = q;
1280 item->binder_type = binder_type;
1281 list_add(&item->list, &block->owner_list);
1282 return 0;
1283}
1284
1285static void tcf_block_owner_del(struct tcf_block *block,
1286 struct Qdisc *q,
1287 enum flow_block_binder_type binder_type)
1288{
1289 struct tcf_block_owner_item *item;
1290
1291 list_for_each_entry(item, &block->owner_list, list) {
1292 if (item->q == q && item->binder_type == binder_type) {
1293 list_del(&item->list);
1294 kfree(item);
1295 return;
1296 }
1297 }
1298 WARN_ON(1);
1299}
1300
1301int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1302 struct tcf_block_ext_info *ei,
1303 struct netlink_ext_ack *extack)
1304{
1305 struct net *net = qdisc_net(q);
1306 struct tcf_block *block = NULL;
1307 int err;
1308
1309 if (ei->block_index)
1310 /* block_index not 0 means the shared block is requested */
1311 block = tcf_block_refcnt_get(net, ei->block_index);
1312
1313 if (!block) {
1314 block = tcf_block_create(net, q, ei->block_index, extack);
1315 if (IS_ERR(block))
1316 return PTR_ERR(block);
1317 if (tcf_block_shared(block)) {
1318 err = tcf_block_insert(block, net, extack);
1319 if (err)
1320 goto err_block_insert;
1321 }
1322 }
1323
1324 err = tcf_block_owner_add(block, q, ei->binder_type);
1325 if (err)
1326 goto err_block_owner_add;
1327
1328 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1329
1330 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1331 if (err)
1332 goto err_chain0_head_change_cb_add;
1333
1334 err = tcf_block_offload_bind(block, q, ei, extack);
1335 if (err)
1336 goto err_block_offload_bind;
1337
1338 *p_block = block;
1339 return 0;
1340
1341err_block_offload_bind:
1342 tcf_chain0_head_change_cb_del(block, ei);
1343err_chain0_head_change_cb_add:
1344 tcf_block_owner_del(block, q, ei->binder_type);
1345err_block_owner_add:
1346err_block_insert:
1347 tcf_block_refcnt_put(block, true);
1348 return err;
1349}
1350EXPORT_SYMBOL(tcf_block_get_ext);
1351
1352static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1353{
1354 struct tcf_proto __rcu **p_filter_chain = priv;
1355
1356 rcu_assign_pointer(*p_filter_chain, tp_head);
1357}
1358
1359int tcf_block_get(struct tcf_block **p_block,
1360 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1361 struct netlink_ext_ack *extack)
1362{
1363 struct tcf_block_ext_info ei = {
1364 .chain_head_change = tcf_chain_head_change_dflt,
1365 .chain_head_change_priv = p_filter_chain,
1366 };
1367
1368 WARN_ON(!p_filter_chain);
1369 return tcf_block_get_ext(p_block, q, &ei, extack);
1370}
1371EXPORT_SYMBOL(tcf_block_get);
1372
1373/* XXX: Standalone actions are not allowed to jump to any chain, and bound
1374 * actions should be all removed after flushing.
1375 */
1376void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1377 struct tcf_block_ext_info *ei)
1378{
1379 if (!block)
1380 return;
1381 tcf_chain0_head_change_cb_del(block, ei);
1382 tcf_block_owner_del(block, q, ei->binder_type);
1383
1384 __tcf_block_put(block, q, ei, true);
1385}
1386EXPORT_SYMBOL(tcf_block_put_ext);
1387
1388void tcf_block_put(struct tcf_block *block)
1389{
1390 struct tcf_block_ext_info ei = {0, };
1391
1392 if (!block)
1393 return;
1394 tcf_block_put_ext(block, block->q, &ei);
1395}
1396
1397EXPORT_SYMBOL(tcf_block_put);
1398
1399static int
1400tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
1401 void *cb_priv, bool add, bool offload_in_use,
1402 struct netlink_ext_ack *extack)
1403{
1404 struct tcf_chain *chain, *chain_prev;
1405 struct tcf_proto *tp, *tp_prev;
1406 int err;
1407
1408 lockdep_assert_held(&block->cb_lock);
1409
1410 for (chain = __tcf_get_next_chain(block, NULL);
1411 chain;
1412 chain_prev = chain,
1413 chain = __tcf_get_next_chain(block, chain),
1414 tcf_chain_put(chain_prev)) {
1415 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1416 tp_prev = tp,
1417 tp = __tcf_get_next_proto(chain, tp),
1418 tcf_proto_put(tp_prev, true, NULL)) {
1419 if (tp->ops->reoffload) {
1420 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1421 extack);
1422 if (err && add)
1423 goto err_playback_remove;
1424 } else if (add && offload_in_use) {
1425 err = -EOPNOTSUPP;
1426 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1427 goto err_playback_remove;
1428 }
1429 }
1430 }
1431
1432 return 0;
1433
1434err_playback_remove:
1435 tcf_proto_put(tp, true, NULL);
1436 tcf_chain_put(chain);
1437 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1438 extack);
1439 return err;
1440}
1441
1442static int tcf_block_bind(struct tcf_block *block,
1443 struct flow_block_offload *bo)
1444{
1445 struct flow_block_cb *block_cb, *next;
1446 int err, i = 0;
1447
1448 lockdep_assert_held(&block->cb_lock);
1449
1450 list_for_each_entry(block_cb, &bo->cb_list, list) {
1451 err = tcf_block_playback_offloads(block, block_cb->cb,
1452 block_cb->cb_priv, true,
1453 tcf_block_offload_in_use(block),
1454 bo->extack);
1455 if (err)
1456 goto err_unroll;
1457 if (!bo->unlocked_driver_cb)
1458 block->lockeddevcnt++;
1459
1460 i++;
1461 }
1462 list_splice(&bo->cb_list, &block->flow_block.cb_list);
1463
1464 return 0;
1465
1466err_unroll:
1467 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1468 if (i-- > 0) {
1469 list_del(&block_cb->list);
1470 tcf_block_playback_offloads(block, block_cb->cb,
1471 block_cb->cb_priv, false,
1472 tcf_block_offload_in_use(block),
1473 NULL);
1474 if (!bo->unlocked_driver_cb)
1475 block->lockeddevcnt--;
1476 }
1477 flow_block_cb_free(block_cb);
1478 }
1479
1480 return err;
1481}
1482
1483static void tcf_block_unbind(struct tcf_block *block,
1484 struct flow_block_offload *bo)
1485{
1486 struct flow_block_cb *block_cb, *next;
1487
1488 lockdep_assert_held(&block->cb_lock);
1489
1490 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1491 tcf_block_playback_offloads(block, block_cb->cb,
1492 block_cb->cb_priv, false,
1493 tcf_block_offload_in_use(block),
1494 NULL);
1495 list_del(&block_cb->list);
1496 flow_block_cb_free(block_cb);
1497 if (!bo->unlocked_driver_cb)
1498 block->lockeddevcnt--;
1499 }
1500}
1501
1502static int tcf_block_setup(struct tcf_block *block,
1503 struct flow_block_offload *bo)
1504{
1505 int err;
1506
1507 switch (bo->command) {
1508 case FLOW_BLOCK_BIND:
1509 err = tcf_block_bind(block, bo);
1510 break;
1511 case FLOW_BLOCK_UNBIND:
1512 err = 0;
1513 tcf_block_unbind(block, bo);
1514 break;
1515 default:
1516 WARN_ON_ONCE(1);
1517 err = -EOPNOTSUPP;
1518 }
1519
1520 return err;
1521}
1522
1523/* Main classifier routine: scans classifier chain attached
1524 * to this qdisc, (optionally) tests for protocol and asks
1525 * specific classifiers.
1526 */
1527static inline int __tcf_classify(struct sk_buff *skb,
1528 const struct tcf_proto *tp,
1529 const struct tcf_proto *orig_tp,
1530 struct tcf_result *res,
1531 bool compat_mode,
1532 u32 *last_executed_chain)
1533{
1534#ifdef CONFIG_NET_CLS_ACT
1535 const int max_reclassify_loop = 4;
1536 const struct tcf_proto *first_tp;
1537 int limit = 0;
1538
1539reclassify:
1540#endif
1541 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1542 __be16 protocol = skb_protocol(skb, false);
1543 int err;
1544
1545 if (tp->protocol != protocol &&
1546 tp->protocol != htons(ETH_P_ALL))
1547 continue;
1548
1549 err = tp->classify(skb, tp, res);
1550#ifdef CONFIG_NET_CLS_ACT
1551 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1552 first_tp = orig_tp;
1553 *last_executed_chain = first_tp->chain->index;
1554 goto reset;
1555 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1556 first_tp = res->goto_tp;
1557 *last_executed_chain = err & TC_ACT_EXT_VAL_MASK;
1558 goto reset;
1559 }
1560#endif
1561 if (err >= 0)
1562 return err;
1563 }
1564
1565 return TC_ACT_UNSPEC; /* signal: continue lookup */
1566#ifdef CONFIG_NET_CLS_ACT
1567reset:
1568 if (unlikely(limit++ >= max_reclassify_loop)) {
1569 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1570 tp->chain->block->index,
1571 tp->prio & 0xffff,
1572 ntohs(tp->protocol));
1573 return TC_ACT_SHOT;
1574 }
1575
1576 tp = first_tp;
1577 goto reclassify;
1578#endif
1579}
1580
1581int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1582 struct tcf_result *res, bool compat_mode)
1583{
1584 u32 last_executed_chain = 0;
1585
1586 return __tcf_classify(skb, tp, tp, res, compat_mode,
1587 &last_executed_chain);
1588}
1589EXPORT_SYMBOL(tcf_classify);
1590
1591int tcf_classify_ingress(struct sk_buff *skb,
1592 const struct tcf_block *ingress_block,
1593 const struct tcf_proto *tp,
1594 struct tcf_result *res, bool compat_mode)
1595{
1596#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1597 u32 last_executed_chain = 0;
1598
1599 return __tcf_classify(skb, tp, tp, res, compat_mode,
1600 &last_executed_chain);
1601#else
1602 u32 last_executed_chain = tp ? tp->chain->index : 0;
1603 const struct tcf_proto *orig_tp = tp;
1604 struct tc_skb_ext *ext;
1605 int ret;
1606
1607 ext = skb_ext_find(skb, TC_SKB_EXT);
1608
1609 if (ext && ext->chain) {
1610 struct tcf_chain *fchain;
1611
1612 fchain = tcf_chain_lookup_rcu(ingress_block, ext->chain);
1613 if (!fchain)
1614 return TC_ACT_SHOT;
1615
1616 /* Consume, so cloned/redirect skbs won't inherit ext */
1617 skb_ext_del(skb, TC_SKB_EXT);
1618
1619 tp = rcu_dereference_bh(fchain->filter_chain);
1620 last_executed_chain = fchain->index;
1621 }
1622
1623 ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode,
1624 &last_executed_chain);
1625
1626 /* If we missed on some chain */
1627 if (ret == TC_ACT_UNSPEC && last_executed_chain) {
1628 ext = skb_ext_add(skb, TC_SKB_EXT);
1629 if (WARN_ON_ONCE(!ext))
1630 return TC_ACT_SHOT;
1631 ext->chain = last_executed_chain;
1632 ext->mru = qdisc_skb_cb(skb)->mru;
1633 }
1634
1635 return ret;
1636#endif
1637}
1638EXPORT_SYMBOL(tcf_classify_ingress);
1639
1640struct tcf_chain_info {
1641 struct tcf_proto __rcu **pprev;
1642 struct tcf_proto __rcu *next;
1643};
1644
1645static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1646 struct tcf_chain_info *chain_info)
1647{
1648 return tcf_chain_dereference(*chain_info->pprev, chain);
1649}
1650
1651static int tcf_chain_tp_insert(struct tcf_chain *chain,
1652 struct tcf_chain_info *chain_info,
1653 struct tcf_proto *tp)
1654{
1655 if (chain->flushing)
1656 return -EAGAIN;
1657
1658 if (*chain_info->pprev == chain->filter_chain)
1659 tcf_chain0_head_change(chain, tp);
1660 tcf_proto_get(tp);
1661 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1662 rcu_assign_pointer(*chain_info->pprev, tp);
1663
1664 return 0;
1665}
1666
1667static void tcf_chain_tp_remove(struct tcf_chain *chain,
1668 struct tcf_chain_info *chain_info,
1669 struct tcf_proto *tp)
1670{
1671 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1672
1673 tcf_proto_mark_delete(tp);
1674 if (tp == chain->filter_chain)
1675 tcf_chain0_head_change(chain, next);
1676 RCU_INIT_POINTER(*chain_info->pprev, next);
1677}
1678
1679static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1680 struct tcf_chain_info *chain_info,
1681 u32 protocol, u32 prio,
1682 bool prio_allocate);
1683
1684/* Try to insert new proto.
1685 * If proto with specified priority already exists, free new proto
1686 * and return existing one.
1687 */
1688
1689static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1690 struct tcf_proto *tp_new,
1691 u32 protocol, u32 prio,
1692 bool rtnl_held)
1693{
1694 struct tcf_chain_info chain_info;
1695 struct tcf_proto *tp;
1696 int err = 0;
1697
1698 mutex_lock(&chain->filter_chain_lock);
1699
1700 if (tcf_proto_exists_destroying(chain, tp_new)) {
1701 mutex_unlock(&chain->filter_chain_lock);
1702 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1703 return ERR_PTR(-EAGAIN);
1704 }
1705
1706 tp = tcf_chain_tp_find(chain, &chain_info,
1707 protocol, prio, false);
1708 if (!tp)
1709 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1710 mutex_unlock(&chain->filter_chain_lock);
1711
1712 if (tp) {
1713 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1714 tp_new = tp;
1715 } else if (err) {
1716 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1717 tp_new = ERR_PTR(err);
1718 }
1719
1720 return tp_new;
1721}
1722
1723static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1724 struct tcf_proto *tp, bool rtnl_held,
1725 struct netlink_ext_ack *extack)
1726{
1727 struct tcf_chain_info chain_info;
1728 struct tcf_proto *tp_iter;
1729 struct tcf_proto **pprev;
1730 struct tcf_proto *next;
1731
1732 mutex_lock(&chain->filter_chain_lock);
1733
1734 /* Atomically find and remove tp from chain. */
1735 for (pprev = &chain->filter_chain;
1736 (tp_iter = tcf_chain_dereference(*pprev, chain));
1737 pprev = &tp_iter->next) {
1738 if (tp_iter == tp) {
1739 chain_info.pprev = pprev;
1740 chain_info.next = tp_iter->next;
1741 WARN_ON(tp_iter->deleting);
1742 break;
1743 }
1744 }
1745 /* Verify that tp still exists and no new filters were inserted
1746 * concurrently.
1747 * Mark tp for deletion if it is empty.
1748 */
1749 if (!tp_iter || !tcf_proto_check_delete(tp)) {
1750 mutex_unlock(&chain->filter_chain_lock);
1751 return;
1752 }
1753
1754 tcf_proto_signal_destroying(chain, tp);
1755 next = tcf_chain_dereference(chain_info.next, chain);
1756 if (tp == chain->filter_chain)
1757 tcf_chain0_head_change(chain, next);
1758 RCU_INIT_POINTER(*chain_info.pprev, next);
1759 mutex_unlock(&chain->filter_chain_lock);
1760
1761 tcf_proto_put(tp, rtnl_held, extack);
1762}
1763
1764static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1765 struct tcf_chain_info *chain_info,
1766 u32 protocol, u32 prio,
1767 bool prio_allocate)
1768{
1769 struct tcf_proto **pprev;
1770 struct tcf_proto *tp;
1771
1772 /* Check the chain for existence of proto-tcf with this priority */
1773 for (pprev = &chain->filter_chain;
1774 (tp = tcf_chain_dereference(*pprev, chain));
1775 pprev = &tp->next) {
1776 if (tp->prio >= prio) {
1777 if (tp->prio == prio) {
1778 if (prio_allocate ||
1779 (tp->protocol != protocol && protocol))
1780 return ERR_PTR(-EINVAL);
1781 } else {
1782 tp = NULL;
1783 }
1784 break;
1785 }
1786 }
1787 chain_info->pprev = pprev;
1788 if (tp) {
1789 chain_info->next = tp->next;
1790 tcf_proto_get(tp);
1791 } else {
1792 chain_info->next = NULL;
1793 }
1794 return tp;
1795}
1796
1797static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1798 struct tcf_proto *tp, struct tcf_block *block,
1799 struct Qdisc *q, u32 parent, void *fh,
1800 u32 portid, u32 seq, u16 flags, int event,
1801 bool terse_dump, bool rtnl_held)
1802{
1803 struct tcmsg *tcm;
1804 struct nlmsghdr *nlh;
1805 unsigned char *b = skb_tail_pointer(skb);
1806
1807 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1808 if (!nlh)
1809 goto out_nlmsg_trim;
1810 tcm = nlmsg_data(nlh);
1811 tcm->tcm_family = AF_UNSPEC;
1812 tcm->tcm__pad1 = 0;
1813 tcm->tcm__pad2 = 0;
1814 if (q) {
1815 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1816 tcm->tcm_parent = parent;
1817 } else {
1818 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1819 tcm->tcm_block_index = block->index;
1820 }
1821 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1822 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1823 goto nla_put_failure;
1824 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1825 goto nla_put_failure;
1826 if (!fh) {
1827 tcm->tcm_handle = 0;
1828 } else if (terse_dump) {
1829 if (tp->ops->terse_dump) {
1830 if (tp->ops->terse_dump(net, tp, fh, skb, tcm,
1831 rtnl_held) < 0)
1832 goto nla_put_failure;
1833 } else {
1834 goto cls_op_not_supp;
1835 }
1836 } else {
1837 if (tp->ops->dump &&
1838 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1839 goto nla_put_failure;
1840 }
1841 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1842 return skb->len;
1843
1844out_nlmsg_trim:
1845nla_put_failure:
1846cls_op_not_supp:
1847 nlmsg_trim(skb, b);
1848 return -1;
1849}
1850
1851static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1852 struct nlmsghdr *n, struct tcf_proto *tp,
1853 struct tcf_block *block, struct Qdisc *q,
1854 u32 parent, void *fh, int event, bool unicast,
1855 bool rtnl_held)
1856{
1857 struct sk_buff *skb;
1858 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1859 int err = 0;
1860
1861 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1862 if (!skb)
1863 return -ENOBUFS;
1864
1865 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1866 n->nlmsg_seq, n->nlmsg_flags, event,
1867 false, rtnl_held) <= 0) {
1868 kfree_skb(skb);
1869 return -EINVAL;
1870 }
1871
1872 if (unicast)
1873 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1874 else
1875 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1876 n->nlmsg_flags & NLM_F_ECHO);
1877
1878 if (err > 0)
1879 err = 0;
1880 return err;
1881}
1882
1883static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1884 struct nlmsghdr *n, struct tcf_proto *tp,
1885 struct tcf_block *block, struct Qdisc *q,
1886 u32 parent, void *fh, bool unicast, bool *last,
1887 bool rtnl_held, struct netlink_ext_ack *extack)
1888{
1889 struct sk_buff *skb;
1890 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1891 int err;
1892
1893 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1894 if (!skb)
1895 return -ENOBUFS;
1896
1897 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1898 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1899 false, rtnl_held) <= 0) {
1900 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1901 kfree_skb(skb);
1902 return -EINVAL;
1903 }
1904
1905 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1906 if (err) {
1907 kfree_skb(skb);
1908 return err;
1909 }
1910
1911 if (unicast)
1912 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1913 else
1914 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1915 n->nlmsg_flags & NLM_F_ECHO);
1916 if (err < 0)
1917 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1918
1919 if (err > 0)
1920 err = 0;
1921 return err;
1922}
1923
1924static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1925 struct tcf_block *block, struct Qdisc *q,
1926 u32 parent, struct nlmsghdr *n,
1927 struct tcf_chain *chain, int event,
1928 bool rtnl_held)
1929{
1930 struct tcf_proto *tp;
1931
1932 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1933 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1934 tfilter_notify(net, oskb, n, tp, block,
1935 q, parent, NULL, event, false, rtnl_held);
1936}
1937
1938static void tfilter_put(struct tcf_proto *tp, void *fh)
1939{
1940 if (tp->ops->put && fh)
1941 tp->ops->put(tp, fh);
1942}
1943
1944static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1945 struct netlink_ext_ack *extack)
1946{
1947 struct net *net = sock_net(skb->sk);
1948 struct nlattr *tca[TCA_MAX + 1];
1949 char name[IFNAMSIZ];
1950 struct tcmsg *t;
1951 u32 protocol;
1952 u32 prio;
1953 bool prio_allocate;
1954 u32 parent;
1955 u32 chain_index;
1956 struct Qdisc *q = NULL;
1957 struct tcf_chain_info chain_info;
1958 struct tcf_chain *chain = NULL;
1959 struct tcf_block *block;
1960 struct tcf_proto *tp;
1961 unsigned long cl;
1962 void *fh;
1963 int err;
1964 int tp_created;
1965 bool rtnl_held = false;
1966
1967 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1968 return -EPERM;
1969
1970replay:
1971 tp_created = 0;
1972
1973 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
1974 rtm_tca_policy, extack);
1975 if (err < 0)
1976 return err;
1977
1978 t = nlmsg_data(n);
1979 protocol = TC_H_MIN(t->tcm_info);
1980 prio = TC_H_MAJ(t->tcm_info);
1981 prio_allocate = false;
1982 parent = t->tcm_parent;
1983 tp = NULL;
1984 cl = 0;
1985 block = NULL;
1986
1987 if (prio == 0) {
1988 /* If no priority is provided by the user,
1989 * we allocate one.
1990 */
1991 if (n->nlmsg_flags & NLM_F_CREATE) {
1992 prio = TC_H_MAKE(0x80000000U, 0U);
1993 prio_allocate = true;
1994 } else {
1995 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1996 return -ENOENT;
1997 }
1998 }
1999
2000 /* Find head of filter chain. */
2001
2002 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2003 if (err)
2004 return err;
2005
2006 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2007 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2008 err = -EINVAL;
2009 goto errout;
2010 }
2011
2012 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2013 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2014 * type is not specified, classifier is not unlocked.
2015 */
2016 if (rtnl_held ||
2017 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2018 !tcf_proto_is_unlocked(name)) {
2019 rtnl_held = true;
2020 rtnl_lock();
2021 }
2022
2023 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2024 if (err)
2025 goto errout;
2026
2027 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2028 extack);
2029 if (IS_ERR(block)) {
2030 err = PTR_ERR(block);
2031 goto errout;
2032 }
2033 block->classid = parent;
2034
2035 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2036 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2037 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2038 err = -EINVAL;
2039 goto errout;
2040 }
2041 chain = tcf_chain_get(block, chain_index, true);
2042 if (!chain) {
2043 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2044 err = -ENOMEM;
2045 goto errout;
2046 }
2047
2048 mutex_lock(&chain->filter_chain_lock);
2049 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2050 prio, prio_allocate);
2051 if (IS_ERR(tp)) {
2052 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2053 err = PTR_ERR(tp);
2054 goto errout_locked;
2055 }
2056
2057 if (tp == NULL) {
2058 struct tcf_proto *tp_new = NULL;
2059
2060 if (chain->flushing) {
2061 err = -EAGAIN;
2062 goto errout_locked;
2063 }
2064
2065 /* Proto-tcf does not exist, create new one */
2066
2067 if (tca[TCA_KIND] == NULL || !protocol) {
2068 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2069 err = -EINVAL;
2070 goto errout_locked;
2071 }
2072
2073 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2074 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2075 err = -ENOENT;
2076 goto errout_locked;
2077 }
2078
2079 if (prio_allocate)
2080 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2081 &chain_info));
2082
2083 mutex_unlock(&chain->filter_chain_lock);
2084 tp_new = tcf_proto_create(name, protocol, prio, chain,
2085 rtnl_held, extack);
2086 if (IS_ERR(tp_new)) {
2087 err = PTR_ERR(tp_new);
2088 goto errout_tp;
2089 }
2090
2091 tp_created = 1;
2092 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2093 rtnl_held);
2094 if (IS_ERR(tp)) {
2095 err = PTR_ERR(tp);
2096 goto errout_tp;
2097 }
2098 } else {
2099 mutex_unlock(&chain->filter_chain_lock);
2100 }
2101
2102 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2103 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2104 err = -EINVAL;
2105 goto errout;
2106 }
2107
2108 fh = tp->ops->get(tp, t->tcm_handle);
2109
2110 if (!fh) {
2111 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2112 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2113 err = -ENOENT;
2114 goto errout;
2115 }
2116 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2117 tfilter_put(tp, fh);
2118 NL_SET_ERR_MSG(extack, "Filter already exists");
2119 err = -EEXIST;
2120 goto errout;
2121 }
2122
2123 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2124 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2125 err = -EINVAL;
2126 goto errout;
2127 }
2128
2129 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2130 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2131 rtnl_held, extack);
2132 if (err == 0) {
2133 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2134 RTM_NEWTFILTER, false, rtnl_held);
2135 tfilter_put(tp, fh);
2136 /* q pointer is NULL for shared blocks */
2137 if (q)
2138 q->flags &= ~TCQ_F_CAN_BYPASS;
2139 }
2140
2141errout:
2142 if (err && tp_created)
2143 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2144errout_tp:
2145 if (chain) {
2146 if (tp && !IS_ERR(tp))
2147 tcf_proto_put(tp, rtnl_held, NULL);
2148 if (!tp_created)
2149 tcf_chain_put(chain);
2150 }
2151 tcf_block_release(q, block, rtnl_held);
2152
2153 if (rtnl_held)
2154 rtnl_unlock();
2155
2156 if (err == -EAGAIN) {
2157 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2158 * of target chain.
2159 */
2160 rtnl_held = true;
2161 /* Replay the request. */
2162 goto replay;
2163 }
2164 return err;
2165
2166errout_locked:
2167 mutex_unlock(&chain->filter_chain_lock);
2168 goto errout;
2169}
2170
2171static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2172 struct netlink_ext_ack *extack)
2173{
2174 struct net *net = sock_net(skb->sk);
2175 struct nlattr *tca[TCA_MAX + 1];
2176 char name[IFNAMSIZ];
2177 struct tcmsg *t;
2178 u32 protocol;
2179 u32 prio;
2180 u32 parent;
2181 u32 chain_index;
2182 struct Qdisc *q = NULL;
2183 struct tcf_chain_info chain_info;
2184 struct tcf_chain *chain = NULL;
2185 struct tcf_block *block = NULL;
2186 struct tcf_proto *tp = NULL;
2187 unsigned long cl = 0;
2188 void *fh = NULL;
2189 int err;
2190 bool rtnl_held = false;
2191
2192 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2193 return -EPERM;
2194
2195 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2196 rtm_tca_policy, extack);
2197 if (err < 0)
2198 return err;
2199
2200 t = nlmsg_data(n);
2201 protocol = TC_H_MIN(t->tcm_info);
2202 prio = TC_H_MAJ(t->tcm_info);
2203 parent = t->tcm_parent;
2204
2205 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2206 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2207 return -ENOENT;
2208 }
2209
2210 /* Find head of filter chain. */
2211
2212 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2213 if (err)
2214 return err;
2215
2216 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2217 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2218 err = -EINVAL;
2219 goto errout;
2220 }
2221 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2222 * found), qdisc is not unlocked, classifier type is not specified,
2223 * classifier is not unlocked.
2224 */
2225 if (!prio ||
2226 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2227 !tcf_proto_is_unlocked(name)) {
2228 rtnl_held = true;
2229 rtnl_lock();
2230 }
2231
2232 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2233 if (err)
2234 goto errout;
2235
2236 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2237 extack);
2238 if (IS_ERR(block)) {
2239 err = PTR_ERR(block);
2240 goto errout;
2241 }
2242
2243 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2244 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2245 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2246 err = -EINVAL;
2247 goto errout;
2248 }
2249 chain = tcf_chain_get(block, chain_index, false);
2250 if (!chain) {
2251 /* User requested flush on non-existent chain. Nothing to do,
2252 * so just return success.
2253 */
2254 if (prio == 0) {
2255 err = 0;
2256 goto errout;
2257 }
2258 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2259 err = -ENOENT;
2260 goto errout;
2261 }
2262
2263 if (prio == 0) {
2264 tfilter_notify_chain(net, skb, block, q, parent, n,
2265 chain, RTM_DELTFILTER, rtnl_held);
2266 tcf_chain_flush(chain, rtnl_held);
2267 err = 0;
2268 goto errout;
2269 }
2270
2271 mutex_lock(&chain->filter_chain_lock);
2272 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2273 prio, false);
2274 if (!tp || IS_ERR(tp)) {
2275 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2276 err = tp ? PTR_ERR(tp) : -ENOENT;
2277 goto errout_locked;
2278 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2279 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2280 err = -EINVAL;
2281 goto errout_locked;
2282 } else if (t->tcm_handle == 0) {
2283 tcf_proto_signal_destroying(chain, tp);
2284 tcf_chain_tp_remove(chain, &chain_info, tp);
2285 mutex_unlock(&chain->filter_chain_lock);
2286
2287 tcf_proto_put(tp, rtnl_held, NULL);
2288 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2289 RTM_DELTFILTER, false, rtnl_held);
2290 err = 0;
2291 goto errout;
2292 }
2293 mutex_unlock(&chain->filter_chain_lock);
2294
2295 fh = tp->ops->get(tp, t->tcm_handle);
2296
2297 if (!fh) {
2298 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2299 err = -ENOENT;
2300 } else {
2301 bool last;
2302
2303 err = tfilter_del_notify(net, skb, n, tp, block,
2304 q, parent, fh, false, &last,
2305 rtnl_held, extack);
2306
2307 if (err)
2308 goto errout;
2309 if (last)
2310 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2311 }
2312
2313errout:
2314 if (chain) {
2315 if (tp && !IS_ERR(tp))
2316 tcf_proto_put(tp, rtnl_held, NULL);
2317 tcf_chain_put(chain);
2318 }
2319 tcf_block_release(q, block, rtnl_held);
2320
2321 if (rtnl_held)
2322 rtnl_unlock();
2323
2324 return err;
2325
2326errout_locked:
2327 mutex_unlock(&chain->filter_chain_lock);
2328 goto errout;
2329}
2330
2331static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2332 struct netlink_ext_ack *extack)
2333{
2334 struct net *net = sock_net(skb->sk);
2335 struct nlattr *tca[TCA_MAX + 1];
2336 char name[IFNAMSIZ];
2337 struct tcmsg *t;
2338 u32 protocol;
2339 u32 prio;
2340 u32 parent;
2341 u32 chain_index;
2342 struct Qdisc *q = NULL;
2343 struct tcf_chain_info chain_info;
2344 struct tcf_chain *chain = NULL;
2345 struct tcf_block *block = NULL;
2346 struct tcf_proto *tp = NULL;
2347 unsigned long cl = 0;
2348 void *fh = NULL;
2349 int err;
2350 bool rtnl_held = false;
2351
2352 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2353 rtm_tca_policy, extack);
2354 if (err < 0)
2355 return err;
2356
2357 t = nlmsg_data(n);
2358 protocol = TC_H_MIN(t->tcm_info);
2359 prio = TC_H_MAJ(t->tcm_info);
2360 parent = t->tcm_parent;
2361
2362 if (prio == 0) {
2363 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2364 return -ENOENT;
2365 }
2366
2367 /* Find head of filter chain. */
2368
2369 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2370 if (err)
2371 return err;
2372
2373 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2374 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2375 err = -EINVAL;
2376 goto errout;
2377 }
2378 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2379 * unlocked, classifier type is not specified, classifier is not
2380 * unlocked.
2381 */
2382 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2383 !tcf_proto_is_unlocked(name)) {
2384 rtnl_held = true;
2385 rtnl_lock();
2386 }
2387
2388 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2389 if (err)
2390 goto errout;
2391
2392 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2393 extack);
2394 if (IS_ERR(block)) {
2395 err = PTR_ERR(block);
2396 goto errout;
2397 }
2398
2399 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2400 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2401 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2402 err = -EINVAL;
2403 goto errout;
2404 }
2405 chain = tcf_chain_get(block, chain_index, false);
2406 if (!chain) {
2407 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2408 err = -EINVAL;
2409 goto errout;
2410 }
2411
2412 mutex_lock(&chain->filter_chain_lock);
2413 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2414 prio, false);
2415 mutex_unlock(&chain->filter_chain_lock);
2416 if (!tp || IS_ERR(tp)) {
2417 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2418 err = tp ? PTR_ERR(tp) : -ENOENT;
2419 goto errout;
2420 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2421 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2422 err = -EINVAL;
2423 goto errout;
2424 }
2425
2426 fh = tp->ops->get(tp, t->tcm_handle);
2427
2428 if (!fh) {
2429 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2430 err = -ENOENT;
2431 } else {
2432 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2433 fh, RTM_NEWTFILTER, true, rtnl_held);
2434 if (err < 0)
2435 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2436 }
2437
2438 tfilter_put(tp, fh);
2439errout:
2440 if (chain) {
2441 if (tp && !IS_ERR(tp))
2442 tcf_proto_put(tp, rtnl_held, NULL);
2443 tcf_chain_put(chain);
2444 }
2445 tcf_block_release(q, block, rtnl_held);
2446
2447 if (rtnl_held)
2448 rtnl_unlock();
2449
2450 return err;
2451}
2452
2453struct tcf_dump_args {
2454 struct tcf_walker w;
2455 struct sk_buff *skb;
2456 struct netlink_callback *cb;
2457 struct tcf_block *block;
2458 struct Qdisc *q;
2459 u32 parent;
2460 bool terse_dump;
2461};
2462
2463static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2464{
2465 struct tcf_dump_args *a = (void *)arg;
2466 struct net *net = sock_net(a->skb->sk);
2467
2468 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2469 n, NETLINK_CB(a->cb->skb).portid,
2470 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2471 RTM_NEWTFILTER, a->terse_dump, true);
2472}
2473
2474static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2475 struct sk_buff *skb, struct netlink_callback *cb,
2476 long index_start, long *p_index, bool terse)
2477{
2478 struct net *net = sock_net(skb->sk);
2479 struct tcf_block *block = chain->block;
2480 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2481 struct tcf_proto *tp, *tp_prev;
2482 struct tcf_dump_args arg;
2483
2484 for (tp = __tcf_get_next_proto(chain, NULL);
2485 tp;
2486 tp_prev = tp,
2487 tp = __tcf_get_next_proto(chain, tp),
2488 tcf_proto_put(tp_prev, true, NULL),
2489 (*p_index)++) {
2490 if (*p_index < index_start)
2491 continue;
2492 if (TC_H_MAJ(tcm->tcm_info) &&
2493 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2494 continue;
2495 if (TC_H_MIN(tcm->tcm_info) &&
2496 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2497 continue;
2498 if (*p_index > index_start)
2499 memset(&cb->args[1], 0,
2500 sizeof(cb->args) - sizeof(cb->args[0]));
2501 if (cb->args[1] == 0) {
2502 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2503 NETLINK_CB(cb->skb).portid,
2504 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2505 RTM_NEWTFILTER, false, true) <= 0)
2506 goto errout;
2507 cb->args[1] = 1;
2508 }
2509 if (!tp->ops->walk)
2510 continue;
2511 arg.w.fn = tcf_node_dump;
2512 arg.skb = skb;
2513 arg.cb = cb;
2514 arg.block = block;
2515 arg.q = q;
2516 arg.parent = parent;
2517 arg.w.stop = 0;
2518 arg.w.skip = cb->args[1] - 1;
2519 arg.w.count = 0;
2520 arg.w.cookie = cb->args[2];
2521 arg.terse_dump = terse;
2522 tp->ops->walk(tp, &arg.w, true);
2523 cb->args[2] = arg.w.cookie;
2524 cb->args[1] = arg.w.count + 1;
2525 if (arg.w.stop)
2526 goto errout;
2527 }
2528 return true;
2529
2530errout:
2531 tcf_proto_put(tp, true, NULL);
2532 return false;
2533}
2534
2535static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
2536 [TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
2537};
2538
2539/* called with RTNL */
2540static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2541{
2542 struct tcf_chain *chain, *chain_prev;
2543 struct net *net = sock_net(skb->sk);
2544 struct nlattr *tca[TCA_MAX + 1];
2545 struct Qdisc *q = NULL;
2546 struct tcf_block *block;
2547 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2548 bool terse_dump = false;
2549 long index_start;
2550 long index;
2551 u32 parent;
2552 int err;
2553
2554 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2555 return skb->len;
2556
2557 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2558 tcf_tfilter_dump_policy, cb->extack);
2559 if (err)
2560 return err;
2561
2562 if (tca[TCA_DUMP_FLAGS]) {
2563 struct nla_bitfield32 flags =
2564 nla_get_bitfield32(tca[TCA_DUMP_FLAGS]);
2565
2566 terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE;
2567 }
2568
2569 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2570 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2571 if (!block)
2572 goto out;
2573 /* If we work with block index, q is NULL and parent value
2574 * will never be used in the following code. The check
2575 * in tcf_fill_node prevents it. However, compiler does not
2576 * see that far, so set parent to zero to silence the warning
2577 * about parent being uninitialized.
2578 */
2579 parent = 0;
2580 } else {
2581 const struct Qdisc_class_ops *cops;
2582 struct net_device *dev;
2583 unsigned long cl = 0;
2584
2585 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2586 if (!dev)
2587 return skb->len;
2588
2589 parent = tcm->tcm_parent;
2590 if (!parent)
2591 q = dev->qdisc;
2592 else
2593 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2594 if (!q)
2595 goto out;
2596 cops = q->ops->cl_ops;
2597 if (!cops)
2598 goto out;
2599 if (!cops->tcf_block)
2600 goto out;
2601 if (TC_H_MIN(tcm->tcm_parent)) {
2602 cl = cops->find(q, tcm->tcm_parent);
2603 if (cl == 0)
2604 goto out;
2605 }
2606 block = cops->tcf_block(q, cl, NULL);
2607 if (!block)
2608 goto out;
2609 parent = block->classid;
2610 if (tcf_block_shared(block))
2611 q = NULL;
2612 }
2613
2614 index_start = cb->args[0];
2615 index = 0;
2616
2617 for (chain = __tcf_get_next_chain(block, NULL);
2618 chain;
2619 chain_prev = chain,
2620 chain = __tcf_get_next_chain(block, chain),
2621 tcf_chain_put(chain_prev)) {
2622 if (tca[TCA_CHAIN] &&
2623 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2624 continue;
2625 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2626 index_start, &index, terse_dump)) {
2627 tcf_chain_put(chain);
2628 err = -EMSGSIZE;
2629 break;
2630 }
2631 }
2632
2633 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2634 tcf_block_refcnt_put(block, true);
2635 cb->args[0] = index;
2636
2637out:
2638 /* If we did no progress, the error (EMSGSIZE) is real */
2639 if (skb->len == 0 && err)
2640 return err;
2641 return skb->len;
2642}
2643
2644static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2645 void *tmplt_priv, u32 chain_index,
2646 struct net *net, struct sk_buff *skb,
2647 struct tcf_block *block,
2648 u32 portid, u32 seq, u16 flags, int event)
2649{
2650 unsigned char *b = skb_tail_pointer(skb);
2651 const struct tcf_proto_ops *ops;
2652 struct nlmsghdr *nlh;
2653 struct tcmsg *tcm;
2654 void *priv;
2655
2656 ops = tmplt_ops;
2657 priv = tmplt_priv;
2658
2659 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2660 if (!nlh)
2661 goto out_nlmsg_trim;
2662 tcm = nlmsg_data(nlh);
2663 tcm->tcm_family = AF_UNSPEC;
2664 tcm->tcm__pad1 = 0;
2665 tcm->tcm__pad2 = 0;
2666 tcm->tcm_handle = 0;
2667 if (block->q) {
2668 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2669 tcm->tcm_parent = block->q->handle;
2670 } else {
2671 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2672 tcm->tcm_block_index = block->index;
2673 }
2674
2675 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2676 goto nla_put_failure;
2677
2678 if (ops) {
2679 if (nla_put_string(skb, TCA_KIND, ops->kind))
2680 goto nla_put_failure;
2681 if (ops->tmplt_dump(skb, net, priv) < 0)
2682 goto nla_put_failure;
2683 }
2684
2685 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2686 return skb->len;
2687
2688out_nlmsg_trim:
2689nla_put_failure:
2690 nlmsg_trim(skb, b);
2691 return -EMSGSIZE;
2692}
2693
2694static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2695 u32 seq, u16 flags, int event, bool unicast)
2696{
2697 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2698 struct tcf_block *block = chain->block;
2699 struct net *net = block->net;
2700 struct sk_buff *skb;
2701 int err = 0;
2702
2703 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2704 if (!skb)
2705 return -ENOBUFS;
2706
2707 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2708 chain->index, net, skb, block, portid,
2709 seq, flags, event) <= 0) {
2710 kfree_skb(skb);
2711 return -EINVAL;
2712 }
2713
2714 if (unicast)
2715 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2716 else
2717 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2718 flags & NLM_F_ECHO);
2719
2720 if (err > 0)
2721 err = 0;
2722 return err;
2723}
2724
2725static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2726 void *tmplt_priv, u32 chain_index,
2727 struct tcf_block *block, struct sk_buff *oskb,
2728 u32 seq, u16 flags, bool unicast)
2729{
2730 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2731 struct net *net = block->net;
2732 struct sk_buff *skb;
2733
2734 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2735 if (!skb)
2736 return -ENOBUFS;
2737
2738 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2739 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2740 kfree_skb(skb);
2741 return -EINVAL;
2742 }
2743
2744 if (unicast)
2745 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2746
2747 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2748}
2749
2750static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2751 struct nlattr **tca,
2752 struct netlink_ext_ack *extack)
2753{
2754 const struct tcf_proto_ops *ops;
2755 char name[IFNAMSIZ];
2756 void *tmplt_priv;
2757
2758 /* If kind is not set, user did not specify template. */
2759 if (!tca[TCA_KIND])
2760 return 0;
2761
2762 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2763 NL_SET_ERR_MSG(extack, "Specified TC chain template name too long");
2764 return -EINVAL;
2765 }
2766
2767 ops = tcf_proto_lookup_ops(name, true, extack);
2768 if (IS_ERR(ops))
2769 return PTR_ERR(ops);
2770 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2771 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2772 return -EOPNOTSUPP;
2773 }
2774
2775 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2776 if (IS_ERR(tmplt_priv)) {
2777 module_put(ops->owner);
2778 return PTR_ERR(tmplt_priv);
2779 }
2780 chain->tmplt_ops = ops;
2781 chain->tmplt_priv = tmplt_priv;
2782 return 0;
2783}
2784
2785static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2786 void *tmplt_priv)
2787{
2788 /* If template ops are set, no work to do for us. */
2789 if (!tmplt_ops)
2790 return;
2791
2792 tmplt_ops->tmplt_destroy(tmplt_priv);
2793 module_put(tmplt_ops->owner);
2794}
2795
2796/* Add/delete/get a chain */
2797
2798static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2799 struct netlink_ext_ack *extack)
2800{
2801 struct net *net = sock_net(skb->sk);
2802 struct nlattr *tca[TCA_MAX + 1];
2803 struct tcmsg *t;
2804 u32 parent;
2805 u32 chain_index;
2806 struct Qdisc *q = NULL;
2807 struct tcf_chain *chain = NULL;
2808 struct tcf_block *block;
2809 unsigned long cl;
2810 int err;
2811
2812 if (n->nlmsg_type != RTM_GETCHAIN &&
2813 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2814 return -EPERM;
2815
2816replay:
2817 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2818 rtm_tca_policy, extack);
2819 if (err < 0)
2820 return err;
2821
2822 t = nlmsg_data(n);
2823 parent = t->tcm_parent;
2824 cl = 0;
2825
2826 block = tcf_block_find(net, &q, &parent, &cl,
2827 t->tcm_ifindex, t->tcm_block_index, extack);
2828 if (IS_ERR(block))
2829 return PTR_ERR(block);
2830
2831 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2832 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2833 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2834 err = -EINVAL;
2835 goto errout_block;
2836 }
2837
2838 mutex_lock(&block->lock);
2839 chain = tcf_chain_lookup(block, chain_index);
2840 if (n->nlmsg_type == RTM_NEWCHAIN) {
2841 if (chain) {
2842 if (tcf_chain_held_by_acts_only(chain)) {
2843 /* The chain exists only because there is
2844 * some action referencing it.
2845 */
2846 tcf_chain_hold(chain);
2847 } else {
2848 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2849 err = -EEXIST;
2850 goto errout_block_locked;
2851 }
2852 } else {
2853 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2854 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2855 err = -ENOENT;
2856 goto errout_block_locked;
2857 }
2858 chain = tcf_chain_create(block, chain_index);
2859 if (!chain) {
2860 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2861 err = -ENOMEM;
2862 goto errout_block_locked;
2863 }
2864 }
2865 } else {
2866 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2867 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2868 err = -EINVAL;
2869 goto errout_block_locked;
2870 }
2871 tcf_chain_hold(chain);
2872 }
2873
2874 if (n->nlmsg_type == RTM_NEWCHAIN) {
2875 /* Modifying chain requires holding parent block lock. In case
2876 * the chain was successfully added, take a reference to the
2877 * chain. This ensures that an empty chain does not disappear at
2878 * the end of this function.
2879 */
2880 tcf_chain_hold(chain);
2881 chain->explicitly_created = true;
2882 }
2883 mutex_unlock(&block->lock);
2884
2885 switch (n->nlmsg_type) {
2886 case RTM_NEWCHAIN:
2887 err = tc_chain_tmplt_add(chain, net, tca, extack);
2888 if (err) {
2889 tcf_chain_put_explicitly_created(chain);
2890 goto errout;
2891 }
2892
2893 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2894 RTM_NEWCHAIN, false);
2895 break;
2896 case RTM_DELCHAIN:
2897 tfilter_notify_chain(net, skb, block, q, parent, n,
2898 chain, RTM_DELTFILTER, true);
2899 /* Flush the chain first as the user requested chain removal. */
2900 tcf_chain_flush(chain, true);
2901 /* In case the chain was successfully deleted, put a reference
2902 * to the chain previously taken during addition.
2903 */
2904 tcf_chain_put_explicitly_created(chain);
2905 break;
2906 case RTM_GETCHAIN:
2907 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2908 n->nlmsg_seq, n->nlmsg_type, true);
2909 if (err < 0)
2910 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2911 break;
2912 default:
2913 err = -EOPNOTSUPP;
2914 NL_SET_ERR_MSG(extack, "Unsupported message type");
2915 goto errout;
2916 }
2917
2918errout:
2919 tcf_chain_put(chain);
2920errout_block:
2921 tcf_block_release(q, block, true);
2922 if (err == -EAGAIN)
2923 /* Replay the request. */
2924 goto replay;
2925 return err;
2926
2927errout_block_locked:
2928 mutex_unlock(&block->lock);
2929 goto errout_block;
2930}
2931
2932/* called with RTNL */
2933static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2934{
2935 struct net *net = sock_net(skb->sk);
2936 struct nlattr *tca[TCA_MAX + 1];
2937 struct Qdisc *q = NULL;
2938 struct tcf_block *block;
2939 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2940 struct tcf_chain *chain;
2941 long index_start;
2942 long index;
2943 u32 parent;
2944 int err;
2945
2946 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2947 return skb->len;
2948
2949 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2950 rtm_tca_policy, cb->extack);
2951 if (err)
2952 return err;
2953
2954 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2955 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2956 if (!block)
2957 goto out;
2958 /* If we work with block index, q is NULL and parent value
2959 * will never be used in the following code. The check
2960 * in tcf_fill_node prevents it. However, compiler does not
2961 * see that far, so set parent to zero to silence the warning
2962 * about parent being uninitialized.
2963 */
2964 parent = 0;
2965 } else {
2966 const struct Qdisc_class_ops *cops;
2967 struct net_device *dev;
2968 unsigned long cl = 0;
2969
2970 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2971 if (!dev)
2972 return skb->len;
2973
2974 parent = tcm->tcm_parent;
2975 if (!parent) {
2976 q = dev->qdisc;
2977 parent = q->handle;
2978 } else {
2979 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2980 }
2981 if (!q)
2982 goto out;
2983 cops = q->ops->cl_ops;
2984 if (!cops)
2985 goto out;
2986 if (!cops->tcf_block)
2987 goto out;
2988 if (TC_H_MIN(tcm->tcm_parent)) {
2989 cl = cops->find(q, tcm->tcm_parent);
2990 if (cl == 0)
2991 goto out;
2992 }
2993 block = cops->tcf_block(q, cl, NULL);
2994 if (!block)
2995 goto out;
2996 if (tcf_block_shared(block))
2997 q = NULL;
2998 }
2999
3000 index_start = cb->args[0];
3001 index = 0;
3002
3003 mutex_lock(&block->lock);
3004 list_for_each_entry(chain, &block->chain_list, list) {
3005 if ((tca[TCA_CHAIN] &&
3006 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
3007 continue;
3008 if (index < index_start) {
3009 index++;
3010 continue;
3011 }
3012 if (tcf_chain_held_by_acts_only(chain))
3013 continue;
3014 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3015 chain->index, net, skb, block,
3016 NETLINK_CB(cb->skb).portid,
3017 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3018 RTM_NEWCHAIN);
3019 if (err <= 0)
3020 break;
3021 index++;
3022 }
3023 mutex_unlock(&block->lock);
3024
3025 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3026 tcf_block_refcnt_put(block, true);
3027 cb->args[0] = index;
3028
3029out:
3030 /* If we did no progress, the error (EMSGSIZE) is real */
3031 if (skb->len == 0 && err)
3032 return err;
3033 return skb->len;
3034}
3035
3036void tcf_exts_destroy(struct tcf_exts *exts)
3037{
3038#ifdef CONFIG_NET_CLS_ACT
3039 if (exts->actions) {
3040 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3041 kfree(exts->actions);
3042 }
3043 exts->nr_actions = 0;
3044#endif
3045}
3046EXPORT_SYMBOL(tcf_exts_destroy);
3047
3048int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3049 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3050 bool rtnl_held, struct netlink_ext_ack *extack)
3051{
3052#ifdef CONFIG_NET_CLS_ACT
3053 {
3054 struct tc_action *act;
3055 size_t attr_size = 0;
3056
3057 if (exts->police && tb[exts->police]) {
3058 act = tcf_action_init_1(net, tp, tb[exts->police],
3059 rate_tlv, "police", ovr,
3060 TCA_ACT_BIND, rtnl_held,
3061 extack);
3062 if (IS_ERR(act))
3063 return PTR_ERR(act);
3064
3065 act->type = exts->type = TCA_OLD_COMPAT;
3066 exts->actions[0] = act;
3067 exts->nr_actions = 1;
3068 } else if (exts->action && tb[exts->action]) {
3069 int err;
3070
3071 err = tcf_action_init(net, tp, tb[exts->action],
3072 rate_tlv, NULL, ovr, TCA_ACT_BIND,
3073 exts->actions, &attr_size,
3074 rtnl_held, extack);
3075 if (err < 0)
3076 return err;
3077 exts->nr_actions = err;
3078 }
3079 }
3080#else
3081 if ((exts->action && tb[exts->action]) ||
3082 (exts->police && tb[exts->police])) {
3083 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3084 return -EOPNOTSUPP;
3085 }
3086#endif
3087
3088 return 0;
3089}
3090EXPORT_SYMBOL(tcf_exts_validate);
3091
3092void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3093{
3094#ifdef CONFIG_NET_CLS_ACT
3095 struct tcf_exts old = *dst;
3096
3097 *dst = *src;
3098 tcf_exts_destroy(&old);
3099#endif
3100}
3101EXPORT_SYMBOL(tcf_exts_change);
3102
3103#ifdef CONFIG_NET_CLS_ACT
3104static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3105{
3106 if (exts->nr_actions == 0)
3107 return NULL;
3108 else
3109 return exts->actions[0];
3110}
3111#endif
3112
3113int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3114{
3115#ifdef CONFIG_NET_CLS_ACT
3116 struct nlattr *nest;
3117
3118 if (exts->action && tcf_exts_has_actions(exts)) {
3119 /*
3120 * again for backward compatible mode - we want
3121 * to work with both old and new modes of entering
3122 * tc data even if iproute2 was newer - jhs
3123 */
3124 if (exts->type != TCA_OLD_COMPAT) {
3125 nest = nla_nest_start_noflag(skb, exts->action);
3126 if (nest == NULL)
3127 goto nla_put_failure;
3128
3129 if (tcf_action_dump(skb, exts->actions, 0, 0, false)
3130 < 0)
3131 goto nla_put_failure;
3132 nla_nest_end(skb, nest);
3133 } else if (exts->police) {
3134 struct tc_action *act = tcf_exts_first_act(exts);
3135 nest = nla_nest_start_noflag(skb, exts->police);
3136 if (nest == NULL || !act)
3137 goto nla_put_failure;
3138 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3139 goto nla_put_failure;
3140 nla_nest_end(skb, nest);
3141 }
3142 }
3143 return 0;
3144
3145nla_put_failure:
3146 nla_nest_cancel(skb, nest);
3147 return -1;
3148#else
3149 return 0;
3150#endif
3151}
3152EXPORT_SYMBOL(tcf_exts_dump);
3153
3154int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts)
3155{
3156#ifdef CONFIG_NET_CLS_ACT
3157 struct nlattr *nest;
3158
3159 if (!exts->action || !tcf_exts_has_actions(exts))
3160 return 0;
3161
3162 nest = nla_nest_start_noflag(skb, exts->action);
3163 if (!nest)
3164 goto nla_put_failure;
3165
3166 if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0)
3167 goto nla_put_failure;
3168 nla_nest_end(skb, nest);
3169 return 0;
3170
3171nla_put_failure:
3172 nla_nest_cancel(skb, nest);
3173 return -1;
3174#else
3175 return 0;
3176#endif
3177}
3178EXPORT_SYMBOL(tcf_exts_terse_dump);
3179
3180int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3181{
3182#ifdef CONFIG_NET_CLS_ACT
3183 struct tc_action *a = tcf_exts_first_act(exts);
3184 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3185 return -1;
3186#endif
3187 return 0;
3188}
3189EXPORT_SYMBOL(tcf_exts_dump_stats);
3190
3191static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
3192{
3193 if (*flags & TCA_CLS_FLAGS_IN_HW)
3194 return;
3195 *flags |= TCA_CLS_FLAGS_IN_HW;
3196 atomic_inc(&block->offloadcnt);
3197}
3198
3199static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
3200{
3201 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
3202 return;
3203 *flags &= ~TCA_CLS_FLAGS_IN_HW;
3204 atomic_dec(&block->offloadcnt);
3205}
3206
3207static void tc_cls_offload_cnt_update(struct tcf_block *block,
3208 struct tcf_proto *tp, u32 *cnt,
3209 u32 *flags, u32 diff, bool add)
3210{
3211 lockdep_assert_held(&block->cb_lock);
3212
3213 spin_lock(&tp->lock);
3214 if (add) {
3215 if (!*cnt)
3216 tcf_block_offload_inc(block, flags);
3217 *cnt += diff;
3218 } else {
3219 *cnt -= diff;
3220 if (!*cnt)
3221 tcf_block_offload_dec(block, flags);
3222 }
3223 spin_unlock(&tp->lock);
3224}
3225
3226static void
3227tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
3228 u32 *cnt, u32 *flags)
3229{
3230 lockdep_assert_held(&block->cb_lock);
3231
3232 spin_lock(&tp->lock);
3233 tcf_block_offload_dec(block, flags);
3234 *cnt = 0;
3235 spin_unlock(&tp->lock);
3236}
3237
3238static int
3239__tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3240 void *type_data, bool err_stop)
3241{
3242 struct flow_block_cb *block_cb;
3243 int ok_count = 0;
3244 int err;
3245
3246 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
3247 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3248 if (err) {
3249 if (err_stop)
3250 return err;
3251 } else {
3252 ok_count++;
3253 }
3254 }
3255 return ok_count;
3256}
3257
3258int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3259 void *type_data, bool err_stop, bool rtnl_held)
3260{
3261 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3262 int ok_count;
3263
3264retry:
3265 if (take_rtnl)
3266 rtnl_lock();
3267 down_read(&block->cb_lock);
3268 /* Need to obtain rtnl lock if block is bound to devs that require it.
3269 * In block bind code cb_lock is obtained while holding rtnl, so we must
3270 * obtain the locks in same order here.
3271 */
3272 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3273 up_read(&block->cb_lock);
3274 take_rtnl = true;
3275 goto retry;
3276 }
3277
3278 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3279
3280 up_read(&block->cb_lock);
3281 if (take_rtnl)
3282 rtnl_unlock();
3283 return ok_count;
3284}
3285EXPORT_SYMBOL(tc_setup_cb_call);
3286
3287/* Non-destructive filter add. If filter that wasn't already in hardware is
3288 * successfully offloaded, increment block offloads counter. On failure,
3289 * previously offloaded filter is considered to be intact and offloads counter
3290 * is not decremented.
3291 */
3292
3293int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
3294 enum tc_setup_type type, void *type_data, bool err_stop,
3295 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3296{
3297 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3298 int ok_count;
3299
3300retry:
3301 if (take_rtnl)
3302 rtnl_lock();
3303 down_read(&block->cb_lock);
3304 /* Need to obtain rtnl lock if block is bound to devs that require it.
3305 * In block bind code cb_lock is obtained while holding rtnl, so we must
3306 * obtain the locks in same order here.
3307 */
3308 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3309 up_read(&block->cb_lock);
3310 take_rtnl = true;
3311 goto retry;
3312 }
3313
3314 /* Make sure all netdevs sharing this block are offload-capable. */
3315 if (block->nooffloaddevcnt && err_stop) {
3316 ok_count = -EOPNOTSUPP;
3317 goto err_unlock;
3318 }
3319
3320 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3321 if (ok_count < 0)
3322 goto err_unlock;
3323
3324 if (tp->ops->hw_add)
3325 tp->ops->hw_add(tp, type_data);
3326 if (ok_count > 0)
3327 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
3328 ok_count, true);
3329err_unlock:
3330 up_read(&block->cb_lock);
3331 if (take_rtnl)
3332 rtnl_unlock();
3333 return ok_count < 0 ? ok_count : 0;
3334}
3335EXPORT_SYMBOL(tc_setup_cb_add);
3336
3337/* Destructive filter replace. If filter that wasn't already in hardware is
3338 * successfully offloaded, increment block offload counter. On failure,
3339 * previously offloaded filter is considered to be destroyed and offload counter
3340 * is decremented.
3341 */
3342
3343int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
3344 enum tc_setup_type type, void *type_data, bool err_stop,
3345 u32 *old_flags, unsigned int *old_in_hw_count,
3346 u32 *new_flags, unsigned int *new_in_hw_count,
3347 bool rtnl_held)
3348{
3349 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3350 int ok_count;
3351
3352retry:
3353 if (take_rtnl)
3354 rtnl_lock();
3355 down_read(&block->cb_lock);
3356 /* Need to obtain rtnl lock if block is bound to devs that require it.
3357 * In block bind code cb_lock is obtained while holding rtnl, so we must
3358 * obtain the locks in same order here.
3359 */
3360 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3361 up_read(&block->cb_lock);
3362 take_rtnl = true;
3363 goto retry;
3364 }
3365
3366 /* Make sure all netdevs sharing this block are offload-capable. */
3367 if (block->nooffloaddevcnt && err_stop) {
3368 ok_count = -EOPNOTSUPP;
3369 goto err_unlock;
3370 }
3371
3372 tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
3373 if (tp->ops->hw_del)
3374 tp->ops->hw_del(tp, type_data);
3375
3376 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3377 if (ok_count < 0)
3378 goto err_unlock;
3379
3380 if (tp->ops->hw_add)
3381 tp->ops->hw_add(tp, type_data);
3382 if (ok_count > 0)
3383 tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
3384 new_flags, ok_count, true);
3385err_unlock:
3386 up_read(&block->cb_lock);
3387 if (take_rtnl)
3388 rtnl_unlock();
3389 return ok_count < 0 ? ok_count : 0;
3390}
3391EXPORT_SYMBOL(tc_setup_cb_replace);
3392
3393/* Destroy filter and decrement block offload counter, if filter was previously
3394 * offloaded.
3395 */
3396
3397int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
3398 enum tc_setup_type type, void *type_data, bool err_stop,
3399 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3400{
3401 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3402 int ok_count;
3403
3404retry:
3405 if (take_rtnl)
3406 rtnl_lock();
3407 down_read(&block->cb_lock);
3408 /* Need to obtain rtnl lock if block is bound to devs that require it.
3409 * In block bind code cb_lock is obtained while holding rtnl, so we must
3410 * obtain the locks in same order here.
3411 */
3412 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3413 up_read(&block->cb_lock);
3414 take_rtnl = true;
3415 goto retry;
3416 }
3417
3418 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3419
3420 tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
3421 if (tp->ops->hw_del)
3422 tp->ops->hw_del(tp, type_data);
3423
3424 up_read(&block->cb_lock);
3425 if (take_rtnl)
3426 rtnl_unlock();
3427 return ok_count < 0 ? ok_count : 0;
3428}
3429EXPORT_SYMBOL(tc_setup_cb_destroy);
3430
3431int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
3432 bool add, flow_setup_cb_t *cb,
3433 enum tc_setup_type type, void *type_data,
3434 void *cb_priv, u32 *flags, unsigned int *in_hw_count)
3435{
3436 int err = cb(type, type_data, cb_priv);
3437
3438 if (err) {
3439 if (add && tc_skip_sw(*flags))
3440 return err;
3441 } else {
3442 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
3443 add);
3444 }
3445
3446 return 0;
3447}
3448EXPORT_SYMBOL(tc_setup_cb_reoffload);
3449
3450static int tcf_act_get_cookie(struct flow_action_entry *entry,
3451 const struct tc_action *act)
3452{
3453 struct tc_cookie *cookie;
3454 int err = 0;
3455
3456 rcu_read_lock();
3457 cookie = rcu_dereference(act->act_cookie);
3458 if (cookie) {
3459 entry->cookie = flow_action_cookie_create(cookie->data,
3460 cookie->len,
3461 GFP_ATOMIC);
3462 if (!entry->cookie)
3463 err = -ENOMEM;
3464 }
3465 rcu_read_unlock();
3466 return err;
3467}
3468
3469static void tcf_act_put_cookie(struct flow_action_entry *entry)
3470{
3471 flow_action_cookie_destroy(entry->cookie);
3472}
3473
3474void tc_cleanup_flow_action(struct flow_action *flow_action)
3475{
3476 struct flow_action_entry *entry;
3477 int i;
3478
3479 flow_action_for_each(i, entry, flow_action) {
3480 tcf_act_put_cookie(entry);
3481 if (entry->destructor)
3482 entry->destructor(entry->destructor_priv);
3483 }
3484}
3485EXPORT_SYMBOL(tc_cleanup_flow_action);
3486
3487static void tcf_mirred_get_dev(struct flow_action_entry *entry,
3488 const struct tc_action *act)
3489{
3490#ifdef CONFIG_NET_CLS_ACT
3491 entry->dev = act->ops->get_dev(act, &entry->destructor);
3492 if (!entry->dev)
3493 return;
3494 entry->destructor_priv = entry->dev;
3495#endif
3496}
3497
3498static void tcf_tunnel_encap_put_tunnel(void *priv)
3499{
3500 struct ip_tunnel_info *tunnel = priv;
3501
3502 kfree(tunnel);
3503}
3504
3505static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry,
3506 const struct tc_action *act)
3507{
3508 entry->tunnel = tcf_tunnel_info_copy(act);
3509 if (!entry->tunnel)
3510 return -ENOMEM;
3511 entry->destructor = tcf_tunnel_encap_put_tunnel;
3512 entry->destructor_priv = entry->tunnel;
3513 return 0;
3514}
3515
3516static void tcf_sample_get_group(struct flow_action_entry *entry,
3517 const struct tc_action *act)
3518{
3519#ifdef CONFIG_NET_CLS_ACT
3520 entry->sample.psample_group =
3521 act->ops->get_psample_group(act, &entry->destructor);
3522 entry->destructor_priv = entry->sample.psample_group;
3523#endif
3524}
3525
3526static void tcf_gate_entry_destructor(void *priv)
3527{
3528 struct action_gate_entry *oe = priv;
3529
3530 kfree(oe);
3531}
3532
3533static int tcf_gate_get_entries(struct flow_action_entry *entry,
3534 const struct tc_action *act)
3535{
3536 entry->gate.entries = tcf_gate_get_list(act);
3537
3538 if (!entry->gate.entries)
3539 return -EINVAL;
3540
3541 entry->destructor = tcf_gate_entry_destructor;
3542 entry->destructor_priv = entry->gate.entries;
3543
3544 return 0;
3545}
3546
3547static enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats)
3548{
3549 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY))
3550 return FLOW_ACTION_HW_STATS_DONT_CARE;
3551 else if (!hw_stats)
3552 return FLOW_ACTION_HW_STATS_DISABLED;
3553
3554 return hw_stats;
3555}
3556
3557int tc_setup_flow_action(struct flow_action *flow_action,
3558 const struct tcf_exts *exts)
3559{
3560 struct tc_action *act;
3561 int i, j, k, err = 0;
3562
3563 BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY);
3564 BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
3565 BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
3566
3567 if (!exts)
3568 return 0;
3569
3570 j = 0;
3571 tcf_exts_for_each_action(i, act, exts) {
3572 struct flow_action_entry *entry;
3573
3574 entry = &flow_action->entries[j];
3575 spin_lock_bh(&act->tcfa_lock);
3576 err = tcf_act_get_cookie(entry, act);
3577 if (err)
3578 goto err_out_locked;
3579
3580 entry->hw_stats = tc_act_hw_stats(act->hw_stats);
3581
3582 if (is_tcf_gact_ok(act)) {
3583 entry->id = FLOW_ACTION_ACCEPT;
3584 } else if (is_tcf_gact_shot(act)) {
3585 entry->id = FLOW_ACTION_DROP;
3586 } else if (is_tcf_gact_trap(act)) {
3587 entry->id = FLOW_ACTION_TRAP;
3588 } else if (is_tcf_gact_goto_chain(act)) {
3589 entry->id = FLOW_ACTION_GOTO;
3590 entry->chain_index = tcf_gact_goto_chain_index(act);
3591 } else if (is_tcf_mirred_egress_redirect(act)) {
3592 entry->id = FLOW_ACTION_REDIRECT;
3593 tcf_mirred_get_dev(entry, act);
3594 } else if (is_tcf_mirred_egress_mirror(act)) {
3595 entry->id = FLOW_ACTION_MIRRED;
3596 tcf_mirred_get_dev(entry, act);
3597 } else if (is_tcf_mirred_ingress_redirect(act)) {
3598 entry->id = FLOW_ACTION_REDIRECT_INGRESS;
3599 tcf_mirred_get_dev(entry, act);
3600 } else if (is_tcf_mirred_ingress_mirror(act)) {
3601 entry->id = FLOW_ACTION_MIRRED_INGRESS;
3602 tcf_mirred_get_dev(entry, act);
3603 } else if (is_tcf_vlan(act)) {
3604 switch (tcf_vlan_action(act)) {
3605 case TCA_VLAN_ACT_PUSH:
3606 entry->id = FLOW_ACTION_VLAN_PUSH;
3607 entry->vlan.vid = tcf_vlan_push_vid(act);
3608 entry->vlan.proto = tcf_vlan_push_proto(act);
3609 entry->vlan.prio = tcf_vlan_push_prio(act);
3610 break;
3611 case TCA_VLAN_ACT_POP:
3612 entry->id = FLOW_ACTION_VLAN_POP;
3613 break;
3614 case TCA_VLAN_ACT_MODIFY:
3615 entry->id = FLOW_ACTION_VLAN_MANGLE;
3616 entry->vlan.vid = tcf_vlan_push_vid(act);
3617 entry->vlan.proto = tcf_vlan_push_proto(act);
3618 entry->vlan.prio = tcf_vlan_push_prio(act);
3619 break;
3620 default:
3621 err = -EOPNOTSUPP;
3622 goto err_out_locked;
3623 }
3624 } else if (is_tcf_tunnel_set(act)) {
3625 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3626 err = tcf_tunnel_encap_get_tunnel(entry, act);
3627 if (err)
3628 goto err_out_locked;
3629 } else if (is_tcf_tunnel_release(act)) {
3630 entry->id = FLOW_ACTION_TUNNEL_DECAP;
3631 } else if (is_tcf_pedit(act)) {
3632 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3633 switch (tcf_pedit_cmd(act, k)) {
3634 case TCA_PEDIT_KEY_EX_CMD_SET:
3635 entry->id = FLOW_ACTION_MANGLE;
3636 break;
3637 case TCA_PEDIT_KEY_EX_CMD_ADD:
3638 entry->id = FLOW_ACTION_ADD;
3639 break;
3640 default:
3641 err = -EOPNOTSUPP;
3642 goto err_out_locked;
3643 }
3644 entry->mangle.htype = tcf_pedit_htype(act, k);
3645 entry->mangle.mask = tcf_pedit_mask(act, k);
3646 entry->mangle.val = tcf_pedit_val(act, k);
3647 entry->mangle.offset = tcf_pedit_offset(act, k);
3648 entry->hw_stats = tc_act_hw_stats(act->hw_stats);
3649 entry = &flow_action->entries[++j];
3650 }
3651 } else if (is_tcf_csum(act)) {
3652 entry->id = FLOW_ACTION_CSUM;
3653 entry->csum_flags = tcf_csum_update_flags(act);
3654 } else if (is_tcf_skbedit_mark(act)) {
3655 entry->id = FLOW_ACTION_MARK;
3656 entry->mark = tcf_skbedit_mark(act);
3657 } else if (is_tcf_sample(act)) {
3658 entry->id = FLOW_ACTION_SAMPLE;
3659 entry->sample.trunc_size = tcf_sample_trunc_size(act);
3660 entry->sample.truncate = tcf_sample_truncate(act);
3661 entry->sample.rate = tcf_sample_rate(act);
3662 tcf_sample_get_group(entry, act);
3663 } else if (is_tcf_police(act)) {
3664 entry->id = FLOW_ACTION_POLICE;
3665 entry->police.burst = tcf_police_burst(act);
3666 entry->police.rate_bytes_ps =
3667 tcf_police_rate_bytes_ps(act);
3668 entry->police.mtu = tcf_police_tcfp_mtu(act);
3669 entry->police.index = act->tcfa_index;
3670 } else if (is_tcf_ct(act)) {
3671 entry->id = FLOW_ACTION_CT;
3672 entry->ct.action = tcf_ct_action(act);
3673 entry->ct.zone = tcf_ct_zone(act);
3674 entry->ct.flow_table = tcf_ct_ft(act);
3675 } else if (is_tcf_mpls(act)) {
3676 switch (tcf_mpls_action(act)) {
3677 case TCA_MPLS_ACT_PUSH:
3678 entry->id = FLOW_ACTION_MPLS_PUSH;
3679 entry->mpls_push.proto = tcf_mpls_proto(act);
3680 entry->mpls_push.label = tcf_mpls_label(act);
3681 entry->mpls_push.tc = tcf_mpls_tc(act);
3682 entry->mpls_push.bos = tcf_mpls_bos(act);
3683 entry->mpls_push.ttl = tcf_mpls_ttl(act);
3684 break;
3685 case TCA_MPLS_ACT_POP:
3686 entry->id = FLOW_ACTION_MPLS_POP;
3687 entry->mpls_pop.proto = tcf_mpls_proto(act);
3688 break;
3689 case TCA_MPLS_ACT_MODIFY:
3690 entry->id = FLOW_ACTION_MPLS_MANGLE;
3691 entry->mpls_mangle.label = tcf_mpls_label(act);
3692 entry->mpls_mangle.tc = tcf_mpls_tc(act);
3693 entry->mpls_mangle.bos = tcf_mpls_bos(act);
3694 entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
3695 break;
3696 default:
3697 goto err_out_locked;
3698 }
3699 } else if (is_tcf_skbedit_ptype(act)) {
3700 entry->id = FLOW_ACTION_PTYPE;
3701 entry->ptype = tcf_skbedit_ptype(act);
3702 } else if (is_tcf_skbedit_priority(act)) {
3703 entry->id = FLOW_ACTION_PRIORITY;
3704 entry->priority = tcf_skbedit_priority(act);
3705 } else if (is_tcf_gate(act)) {
3706 entry->id = FLOW_ACTION_GATE;
3707 entry->gate.index = tcf_gate_index(act);
3708 entry->gate.prio = tcf_gate_prio(act);
3709 entry->gate.basetime = tcf_gate_basetime(act);
3710 entry->gate.cycletime = tcf_gate_cycletime(act);
3711 entry->gate.cycletimeext = tcf_gate_cycletimeext(act);
3712 entry->gate.num_entries = tcf_gate_num_entries(act);
3713 err = tcf_gate_get_entries(entry, act);
3714 if (err)
3715 goto err_out;
3716 } else {
3717 err = -EOPNOTSUPP;
3718 goto err_out_locked;
3719 }
3720 spin_unlock_bh(&act->tcfa_lock);
3721
3722 if (!is_tcf_pedit(act))
3723 j++;
3724 }
3725
3726err_out:
3727 if (err)
3728 tc_cleanup_flow_action(flow_action);
3729
3730 return err;
3731err_out_locked:
3732 spin_unlock_bh(&act->tcfa_lock);
3733 goto err_out;
3734}
3735EXPORT_SYMBOL(tc_setup_flow_action);
3736
3737unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3738{
3739 unsigned int num_acts = 0;
3740 struct tc_action *act;
3741 int i;
3742
3743 tcf_exts_for_each_action(i, act, exts) {
3744 if (is_tcf_pedit(act))
3745 num_acts += tcf_pedit_nkeys(act);
3746 else
3747 num_acts++;
3748 }
3749 return num_acts;
3750}
3751EXPORT_SYMBOL(tcf_exts_num_actions);
3752
3753#ifdef CONFIG_NET_CLS_ACT
3754static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
3755 u32 *p_block_index,
3756 struct netlink_ext_ack *extack)
3757{
3758 *p_block_index = nla_get_u32(block_index_attr);
3759 if (!*p_block_index) {
3760 NL_SET_ERR_MSG(extack, "Block number may not be zero");
3761 return -EINVAL;
3762 }
3763
3764 return 0;
3765}
3766
3767int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
3768 enum flow_block_binder_type binder_type,
3769 struct nlattr *block_index_attr,
3770 struct netlink_ext_ack *extack)
3771{
3772 u32 block_index;
3773 int err;
3774
3775 if (!block_index_attr)
3776 return 0;
3777
3778 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3779 if (err)
3780 return err;
3781
3782 if (!block_index)
3783 return 0;
3784
3785 qe->info.binder_type = binder_type;
3786 qe->info.chain_head_change = tcf_chain_head_change_dflt;
3787 qe->info.chain_head_change_priv = &qe->filter_chain;
3788 qe->info.block_index = block_index;
3789
3790 return tcf_block_get_ext(&qe->block, sch, &qe->info, extack);
3791}
3792EXPORT_SYMBOL(tcf_qevent_init);
3793
3794void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
3795{
3796 if (qe->info.block_index)
3797 tcf_block_put_ext(qe->block, sch, &qe->info);
3798}
3799EXPORT_SYMBOL(tcf_qevent_destroy);
3800
3801int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
3802 struct netlink_ext_ack *extack)
3803{
3804 u32 block_index;
3805 int err;
3806
3807 if (!block_index_attr)
3808 return 0;
3809
3810 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3811 if (err)
3812 return err;
3813
3814 /* Bounce newly-configured block or change in block. */
3815 if (block_index != qe->info.block_index) {
3816 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
3817 return -EINVAL;
3818 }
3819
3820 return 0;
3821}
3822EXPORT_SYMBOL(tcf_qevent_validate_change);
3823
3824struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
3825 struct sk_buff **to_free, int *ret)
3826{
3827 struct tcf_result cl_res;
3828 struct tcf_proto *fl;
3829
3830 if (!qe->info.block_index)
3831 return skb;
3832
3833 fl = rcu_dereference_bh(qe->filter_chain);
3834
3835 switch (tcf_classify(skb, fl, &cl_res, false)) {
3836 case TC_ACT_SHOT:
3837 qdisc_qstats_drop(sch);
3838 __qdisc_drop(skb, to_free);
3839 *ret = __NET_XMIT_BYPASS;
3840 return NULL;
3841 case TC_ACT_STOLEN:
3842 case TC_ACT_QUEUED:
3843 case TC_ACT_TRAP:
3844 __qdisc_drop(skb, to_free);
3845 *ret = __NET_XMIT_STOLEN;
3846 return NULL;
3847 case TC_ACT_REDIRECT:
3848 skb_do_redirect(skb);
3849 *ret = __NET_XMIT_STOLEN;
3850 return NULL;
3851 }
3852
3853 return skb;
3854}
3855EXPORT_SYMBOL(tcf_qevent_handle);
3856
3857int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
3858{
3859 if (!qe->info.block_index)
3860 return 0;
3861 return nla_put_u32(skb, attr_name, qe->info.block_index);
3862}
3863EXPORT_SYMBOL(tcf_qevent_dump);
3864#endif
3865
3866static __net_init int tcf_net_init(struct net *net)
3867{
3868 struct tcf_net *tn = net_generic(net, tcf_net_id);
3869
3870 spin_lock_init(&tn->idr_lock);
3871 idr_init(&tn->idr);
3872 return 0;
3873}
3874
3875static void __net_exit tcf_net_exit(struct net *net)
3876{
3877 struct tcf_net *tn = net_generic(net, tcf_net_id);
3878
3879 idr_destroy(&tn->idr);
3880}
3881
3882static struct pernet_operations tcf_net_ops = {
3883 .init = tcf_net_init,
3884 .exit = tcf_net_exit,
3885 .id = &tcf_net_id,
3886 .size = sizeof(struct tcf_net),
3887};
3888
3889static int __init tc_filter_init(void)
3890{
3891 int err;
3892
3893 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3894 if (!tc_filter_wq)
3895 return -ENOMEM;
3896
3897 err = register_pernet_subsys(&tcf_net_ops);
3898 if (err)
3899 goto err_register_pernet_subsys;
3900
3901 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3902 RTNL_FLAG_DOIT_UNLOCKED);
3903 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3904 RTNL_FLAG_DOIT_UNLOCKED);
3905 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3906 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3907 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3908 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3909 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3910 tc_dump_chain, 0);
3911
3912 return 0;
3913
3914err_register_pernet_subsys:
3915 destroy_workqueue(tc_filter_wq);
3916 return err;
3917}
3918
3919subsys_initcall(tc_filter_init);