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drm/modes: Fix drm_mode_vrefres() docs
[drm/drm-misc.git] / net / sched / cls_api.c
blob7578e27260c9bb78b6efa428e64a5b13b074833a
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 <linux/rhashtable.h>
26 #include <net/net_namespace.h>
27 #include <net/sock.h>
28 #include <net/netlink.h>
29 #include <net/pkt_sched.h>
30 #include <net/pkt_cls.h>
31 #include <net/tc_act/tc_pedit.h>
32 #include <net/tc_act/tc_mirred.h>
33 #include <net/tc_act/tc_vlan.h>
34 #include <net/tc_act/tc_tunnel_key.h>
35 #include <net/tc_act/tc_csum.h>
36 #include <net/tc_act/tc_gact.h>
37 #include <net/tc_act/tc_police.h>
38 #include <net/tc_act/tc_sample.h>
39 #include <net/tc_act/tc_skbedit.h>
40 #include <net/tc_act/tc_ct.h>
41 #include <net/tc_act/tc_mpls.h>
42 #include <net/tc_act/tc_gate.h>
43 #include <net/flow_offload.h>
44 #include <net/tc_wrapper.h>
45
46 /* The list of all installed classifier types */
47 static LIST_HEAD(tcf_proto_base);
48
49 /* Protects list of registered TC modules. It is pure SMP lock. */
50 static DEFINE_RWLOCK(cls_mod_lock);
51
52 static struct xarray tcf_exts_miss_cookies_xa;
53 struct tcf_exts_miss_cookie_node {
54 const struct tcf_chain *chain;
55 const struct tcf_proto *tp;
56 const struct tcf_exts *exts;
57 u32 chain_index;
58 u32 tp_prio;
59 u32 handle;
60 u32 miss_cookie_base;
61 struct rcu_head rcu;
62 };
63
64 /* Each tc action entry cookie will be comprised of 32bit miss_cookie_base +
65 * action index in the exts tc actions array.
66 */
67 union tcf_exts_miss_cookie {
68 struct {
69 u32 miss_cookie_base;
70 u32 act_index;
71 };
72 u64 miss_cookie;
73 };
74
75 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
76 static int
77 tcf_exts_miss_cookie_base_alloc(struct tcf_exts *exts, struct tcf_proto *tp,
78 u32 handle)
79 {
80 struct tcf_exts_miss_cookie_node *n;
81 static u32 next;
82 int err;
83
84 if (WARN_ON(!handle || !tp->ops->get_exts))
85 return -EINVAL;
86
87 n = kzalloc(sizeof(*n), GFP_KERNEL);
88 if (!n)
89 return -ENOMEM;
90
91 n->chain_index = tp->chain->index;
92 n->chain = tp->chain;
93 n->tp_prio = tp->prio;
94 n->tp = tp;
95 n->exts = exts;
96 n->handle = handle;
97
98 err = xa_alloc_cyclic(&tcf_exts_miss_cookies_xa, &n->miss_cookie_base,
99 n, xa_limit_32b, &next, GFP_KERNEL);
100 if (err)
101 goto err_xa_alloc;
102
103 exts->miss_cookie_node = n;
104 return 0;
105
106 err_xa_alloc:
107 kfree(n);
108 return err;
109 }
110
111 static void tcf_exts_miss_cookie_base_destroy(struct tcf_exts *exts)
112 {
113 struct tcf_exts_miss_cookie_node *n;
114
115 if (!exts->miss_cookie_node)
116 return;
117
118 n = exts->miss_cookie_node;
119 xa_erase(&tcf_exts_miss_cookies_xa, n->miss_cookie_base);
120 kfree_rcu(n, rcu);
121 }
122
123 static struct tcf_exts_miss_cookie_node *
124 tcf_exts_miss_cookie_lookup(u64 miss_cookie, int *act_index)
125 {
126 union tcf_exts_miss_cookie mc = { .miss_cookie = miss_cookie, };
127
128 *act_index = mc.act_index;
129 return xa_load(&tcf_exts_miss_cookies_xa, mc.miss_cookie_base);
130 }
131 #else /* IS_ENABLED(CONFIG_NET_TC_SKB_EXT) */
132 static int
133 tcf_exts_miss_cookie_base_alloc(struct tcf_exts *exts, struct tcf_proto *tp,
134 u32 handle)
135 {
136 return 0;
137 }
138
139 static void tcf_exts_miss_cookie_base_destroy(struct tcf_exts *exts)
140 {
141 }
142 #endif /* IS_ENABLED(CONFIG_NET_TC_SKB_EXT) */
143
144 static u64 tcf_exts_miss_cookie_get(u32 miss_cookie_base, int act_index)
145 {
146 union tcf_exts_miss_cookie mc = { .act_index = act_index, };
147
148 if (!miss_cookie_base)
149 return 0;
150
151 mc.miss_cookie_base = miss_cookie_base;
152 return mc.miss_cookie;
153 }
154
155 #ifdef CONFIG_NET_CLS_ACT
156 DEFINE_STATIC_KEY_FALSE(tc_skb_ext_tc);
157 EXPORT_SYMBOL(tc_skb_ext_tc);
158
159 void tc_skb_ext_tc_enable(void)
160 {
161 static_branch_inc(&tc_skb_ext_tc);
162 }
163 EXPORT_SYMBOL(tc_skb_ext_tc_enable);
164
165 void tc_skb_ext_tc_disable(void)
166 {
167 static_branch_dec(&tc_skb_ext_tc);
168 }
169 EXPORT_SYMBOL(tc_skb_ext_tc_disable);
170 #endif
171
172 static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
173 {
174 return jhash_3words(tp->chain->index, tp->prio,
175 (__force __u32)tp->protocol, 0);
176 }
177
178 static void tcf_proto_signal_destroying(struct tcf_chain *chain,
179 struct tcf_proto *tp)
180 {
181 struct tcf_block *block = chain->block;
182
183 mutex_lock(&block->proto_destroy_lock);
184 hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
185 destroy_obj_hashfn(tp));
186 mutex_unlock(&block->proto_destroy_lock);
187 }
188
189 static bool tcf_proto_cmp(const struct tcf_proto *tp1,
190 const struct tcf_proto *tp2)
191 {
192 return tp1->chain->index == tp2->chain->index &&
193 tp1->prio == tp2->prio &&
194 tp1->protocol == tp2->protocol;
195 }
196
197 static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
198 struct tcf_proto *tp)
199 {
200 u32 hash = destroy_obj_hashfn(tp);
201 struct tcf_proto *iter;
202 bool found = false;
203
204 rcu_read_lock();
205 hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
206 destroy_ht_node, hash) {
207 if (tcf_proto_cmp(tp, iter)) {
208 found = true;
209 break;
210 }
211 }
212 rcu_read_unlock();
213
214 return found;
215 }
216
217 static void
218 tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
219 {
220 struct tcf_block *block = chain->block;
221
222 mutex_lock(&block->proto_destroy_lock);
223 if (hash_hashed(&tp->destroy_ht_node))
224 hash_del_rcu(&tp->destroy_ht_node);
225 mutex_unlock(&block->proto_destroy_lock);
226 }
227
228 /* Find classifier type by string name */
229
230 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
231 {
232 const struct tcf_proto_ops *t, *res = NULL;
233
234 if (kind) {
235 read_lock(&cls_mod_lock);
236 list_for_each_entry(t, &tcf_proto_base, head) {
237 if (strcmp(kind, t->kind) == 0) {
238 if (try_module_get(t->owner))
239 res = t;
240 break;
241 }
242 }
243 read_unlock(&cls_mod_lock);
244 }
245 return res;
246 }
247
248 static const struct tcf_proto_ops *
249 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
250 struct netlink_ext_ack *extack)
251 {
252 const struct tcf_proto_ops *ops;
253
254 ops = __tcf_proto_lookup_ops(kind);
255 if (ops)
256 return ops;
257 #ifdef CONFIG_MODULES
258 if (rtnl_held)
259 rtnl_unlock();
260 request_module(NET_CLS_ALIAS_PREFIX "%s", kind);
261 if (rtnl_held)
262 rtnl_lock();
263 ops = __tcf_proto_lookup_ops(kind);
264 /* We dropped the RTNL semaphore in order to perform
265 * the module load. So, even if we succeeded in loading
266 * the module we have to replay the request. We indicate
267 * this using -EAGAIN.
268 */
269 if (ops) {
270 module_put(ops->owner);
271 return ERR_PTR(-EAGAIN);
272 }
273 #endif
274 NL_SET_ERR_MSG(extack, "TC classifier not found");
275 return ERR_PTR(-ENOENT);
276 }
277
278 /* Register(unregister) new classifier type */
279
280 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
281 {
282 struct tcf_proto_ops *t;
283 int rc = -EEXIST;
284
285 write_lock(&cls_mod_lock);
286 list_for_each_entry(t, &tcf_proto_base, head)
287 if (!strcmp(ops->kind, t->kind))
288 goto out;
289
290 list_add_tail(&ops->head, &tcf_proto_base);
291 rc = 0;
292 out:
293 write_unlock(&cls_mod_lock);
294 return rc;
295 }
296 EXPORT_SYMBOL(register_tcf_proto_ops);
297
298 static struct workqueue_struct *tc_filter_wq;
299
300 void unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
301 {
302 struct tcf_proto_ops *t;
303 int rc = -ENOENT;
304
305 /* Wait for outstanding call_rcu()s, if any, from a
306 * tcf_proto_ops's destroy() handler.
307 */
308 rcu_barrier();
309 flush_workqueue(tc_filter_wq);
310
311 write_lock(&cls_mod_lock);
312 list_for_each_entry(t, &tcf_proto_base, head) {
313 if (t == ops) {
314 list_del(&t->head);
315 rc = 0;
316 break;
317 }
318 }
319 write_unlock(&cls_mod_lock);
320
321 WARN(rc, "unregister tc filter kind(%s) failed %d\n", ops->kind, rc);
322 }
323 EXPORT_SYMBOL(unregister_tcf_proto_ops);
324
325 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
326 {
327 INIT_RCU_WORK(rwork, func);
328 return queue_rcu_work(tc_filter_wq, rwork);
329 }
330 EXPORT_SYMBOL(tcf_queue_work);
331
332 /* Select new prio value from the range, managed by kernel. */
333
334 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
335 {
336 u32 first = TC_H_MAKE(0xC0000000U, 0U);
337
338 if (tp)
339 first = tp->prio - 1;
340
341 return TC_H_MAJ(first);
342 }
343
344 static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
345 {
346 if (kind)
347 return nla_strscpy(name, kind, IFNAMSIZ) < 0;
348 memset(name, 0, IFNAMSIZ);
349 return false;
350 }
351
352 static bool tcf_proto_is_unlocked(const char *kind)
353 {
354 const struct tcf_proto_ops *ops;
355 bool ret;
356
357 if (strlen(kind) == 0)
358 return false;
359
360 ops = tcf_proto_lookup_ops(kind, false, NULL);
361 /* On error return false to take rtnl lock. Proto lookup/create
362 * functions will perform lookup again and properly handle errors.
363 */
364 if (IS_ERR(ops))
365 return false;
366
367 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
368 module_put(ops->owner);
369 return ret;
370 }
371
372 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
373 u32 prio, struct tcf_chain *chain,
374 bool rtnl_held,
375 struct netlink_ext_ack *extack)
376 {
377 struct tcf_proto *tp;
378 int err;
379
380 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
381 if (!tp)
382 return ERR_PTR(-ENOBUFS);
383
384 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
385 if (IS_ERR(tp->ops)) {
386 err = PTR_ERR(tp->ops);
387 goto errout;
388 }
389 tp->classify = tp->ops->classify;
390 tp->protocol = protocol;
391 tp->prio = prio;
392 tp->chain = chain;
393 spin_lock_init(&tp->lock);
394 refcount_set(&tp->refcnt, 1);
395
396 err = tp->ops->init(tp);
397 if (err) {
398 module_put(tp->ops->owner);
399 goto errout;
400 }
401 return tp;
402
403 errout:
404 kfree(tp);
405 return ERR_PTR(err);
406 }
407
408 static void tcf_proto_get(struct tcf_proto *tp)
409 {
410 refcount_inc(&tp->refcnt);
411 }
412
413 static void tcf_maintain_bypass(struct tcf_block *block)
414 {
415 int filtercnt = atomic_read(&block->filtercnt);
416 int skipswcnt = atomic_read(&block->skipswcnt);
417 bool bypass_wanted = filtercnt > 0 && filtercnt == skipswcnt;
418
419 if (bypass_wanted != block->bypass_wanted) {
420 #ifdef CONFIG_NET_CLS_ACT
421 if (bypass_wanted)
422 static_branch_inc(&tcf_bypass_check_needed_key);
423 else
424 static_branch_dec(&tcf_bypass_check_needed_key);
425 #endif
426 block->bypass_wanted = bypass_wanted;
427 }
428 }
429
430 static void tcf_block_filter_cnt_update(struct tcf_block *block, bool *counted, bool add)
431 {
432 lockdep_assert_not_held(&block->cb_lock);
433
434 down_write(&block->cb_lock);
435 if (*counted != add) {
436 if (add) {
437 atomic_inc(&block->filtercnt);
438 *counted = true;
439 } else {
440 atomic_dec(&block->filtercnt);
441 *counted = false;
442 }
443 }
444 tcf_maintain_bypass(block);
445 up_write(&block->cb_lock);
446 }
447
448 static void tcf_chain_put(struct tcf_chain *chain);
449
450 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
451 bool sig_destroy, struct netlink_ext_ack *extack)
452 {
453 tp->ops->destroy(tp, rtnl_held, extack);
454 tcf_block_filter_cnt_update(tp->chain->block, &tp->counted, false);
455 if (sig_destroy)
456 tcf_proto_signal_destroyed(tp->chain, tp);
457 tcf_chain_put(tp->chain);
458 module_put(tp->ops->owner);
459 kfree_rcu(tp, rcu);
460 }
461
462 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
463 struct netlink_ext_ack *extack)
464 {
465 if (refcount_dec_and_test(&tp->refcnt))
466 tcf_proto_destroy(tp, rtnl_held, true, extack);
467 }
468
469 static bool tcf_proto_check_delete(struct tcf_proto *tp)
470 {
471 if (tp->ops->delete_empty)
472 return tp->ops->delete_empty(tp);
473
474 tp->deleting = true;
475 return tp->deleting;
476 }
477
478 static void tcf_proto_mark_delete(struct tcf_proto *tp)
479 {
480 spin_lock(&tp->lock);
481 tp->deleting = true;
482 spin_unlock(&tp->lock);
483 }
484
485 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
486 {
487 bool deleting;
488
489 spin_lock(&tp->lock);
490 deleting = tp->deleting;
491 spin_unlock(&tp->lock);
492
493 return deleting;
494 }
495
496 #define ASSERT_BLOCK_LOCKED(block) \
497 lockdep_assert_held(&(block)->lock)
498
499 struct tcf_filter_chain_list_item {
500 struct list_head list;
501 tcf_chain_head_change_t *chain_head_change;
502 void *chain_head_change_priv;
503 };
504
505 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
506 u32 chain_index)
507 {
508 struct tcf_chain *chain;
509
510 ASSERT_BLOCK_LOCKED(block);
511
512 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
513 if (!chain)
514 return NULL;
515 list_add_tail_rcu(&chain->list, &block->chain_list);
516 mutex_init(&chain->filter_chain_lock);
517 chain->block = block;
518 chain->index = chain_index;
519 chain->refcnt = 1;
520 if (!chain->index)
521 block->chain0.chain = chain;
522 return chain;
523 }
524
525 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
526 struct tcf_proto *tp_head)
527 {
528 if (item->chain_head_change)
529 item->chain_head_change(tp_head, item->chain_head_change_priv);
530 }
531
532 static void tcf_chain0_head_change(struct tcf_chain *chain,
533 struct tcf_proto *tp_head)
534 {
535 struct tcf_filter_chain_list_item *item;
536 struct tcf_block *block = chain->block;
537
538 if (chain->index)
539 return;
540
541 mutex_lock(&block->lock);
542 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
543 tcf_chain_head_change_item(item, tp_head);
544 mutex_unlock(&block->lock);
545 }
546
547 /* Returns true if block can be safely freed. */
548
549 static bool tcf_chain_detach(struct tcf_chain *chain)
550 {
551 struct tcf_block *block = chain->block;
552
553 ASSERT_BLOCK_LOCKED(block);
554
555 list_del_rcu(&chain->list);
556 if (!chain->index)
557 block->chain0.chain = NULL;
558
559 if (list_empty(&block->chain_list) &&
560 refcount_read(&block->refcnt) == 0)
561 return true;
562
563 return false;
564 }
565
566 static void tcf_block_destroy(struct tcf_block *block)
567 {
568 mutex_destroy(&block->lock);
569 mutex_destroy(&block->proto_destroy_lock);
570 xa_destroy(&block->ports);
571 kfree_rcu(block, rcu);
572 }
573
574 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
575 {
576 struct tcf_block *block = chain->block;
577
578 mutex_destroy(&chain->filter_chain_lock);
579 kfree_rcu(chain, rcu);
580 if (free_block)
581 tcf_block_destroy(block);
582 }
583
584 static void tcf_chain_hold(struct tcf_chain *chain)
585 {
586 ASSERT_BLOCK_LOCKED(chain->block);
587
588 ++chain->refcnt;
589 }
590
591 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
592 {
593 ASSERT_BLOCK_LOCKED(chain->block);
594
595 /* In case all the references are action references, this
596 * chain should not be shown to the user.
597 */
598 return chain->refcnt == chain->action_refcnt;
599 }
600
601 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
602 u32 chain_index)
603 {
604 struct tcf_chain *chain;
605
606 ASSERT_BLOCK_LOCKED(block);
607
608 list_for_each_entry(chain, &block->chain_list, list) {
609 if (chain->index == chain_index)
610 return chain;
611 }
612 return NULL;
613 }
614
615 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
616 static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block,
617 u32 chain_index)
618 {
619 struct tcf_chain *chain;
620
621 list_for_each_entry_rcu(chain, &block->chain_list, list) {
622 if (chain->index == chain_index)
623 return chain;
624 }
625 return NULL;
626 }
627 #endif
628
629 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
630 u32 seq, u16 flags, int event, bool unicast,
631 struct netlink_ext_ack *extack);
632
633 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
634 u32 chain_index, bool create,
635 bool by_act)
636 {
637 struct tcf_chain *chain = NULL;
638 bool is_first_reference;
639
640 mutex_lock(&block->lock);
641 chain = tcf_chain_lookup(block, chain_index);
642 if (chain) {
643 tcf_chain_hold(chain);
644 } else {
645 if (!create)
646 goto errout;
647 chain = tcf_chain_create(block, chain_index);
648 if (!chain)
649 goto errout;
650 }
651
652 if (by_act)
653 ++chain->action_refcnt;
654 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
655 mutex_unlock(&block->lock);
656
657 /* Send notification only in case we got the first
658 * non-action reference. Until then, the chain acts only as
659 * a placeholder for actions pointing to it and user ought
660 * not know about them.
661 */
662 if (is_first_reference && !by_act)
663 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
664 RTM_NEWCHAIN, false, NULL);
665
666 return chain;
667
668 errout:
669 mutex_unlock(&block->lock);
670 return chain;
671 }
672
673 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
674 bool create)
675 {
676 return __tcf_chain_get(block, chain_index, create, false);
677 }
678
679 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
680 {
681 return __tcf_chain_get(block, chain_index, true, true);
682 }
683 EXPORT_SYMBOL(tcf_chain_get_by_act);
684
685 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
686 void *tmplt_priv);
687 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
688 void *tmplt_priv, u32 chain_index,
689 struct tcf_block *block, struct sk_buff *oskb,
690 u32 seq, u16 flags);
691
692 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
693 bool explicitly_created)
694 {
695 struct tcf_block *block = chain->block;
696 const struct tcf_proto_ops *tmplt_ops;
697 unsigned int refcnt, non_act_refcnt;
698 bool free_block = false;
699 void *tmplt_priv;
700
701 mutex_lock(&block->lock);
702 if (explicitly_created) {
703 if (!chain->explicitly_created) {
704 mutex_unlock(&block->lock);
705 return;
706 }
707 chain->explicitly_created = false;
708 }
709
710 if (by_act)
711 chain->action_refcnt--;
712
713 /* tc_chain_notify_delete can't be called while holding block lock.
714 * However, when block is unlocked chain can be changed concurrently, so
715 * save these to temporary variables.
716 */
717 refcnt = --chain->refcnt;
718 non_act_refcnt = refcnt - chain->action_refcnt;
719 tmplt_ops = chain->tmplt_ops;
720 tmplt_priv = chain->tmplt_priv;
721
722 if (non_act_refcnt == chain->explicitly_created && !by_act) {
723 if (non_act_refcnt == 0)
724 tc_chain_notify_delete(tmplt_ops, tmplt_priv,
725 chain->index, block, NULL, 0, 0);
726 /* Last reference to chain, no need to lock. */
727 chain->flushing = false;
728 }
729
730 if (refcnt == 0)
731 free_block = tcf_chain_detach(chain);
732 mutex_unlock(&block->lock);
733
734 if (refcnt == 0) {
735 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
736 tcf_chain_destroy(chain, free_block);
737 }
738 }
739
740 static void tcf_chain_put(struct tcf_chain *chain)
741 {
742 __tcf_chain_put(chain, false, false);
743 }
744
745 void tcf_chain_put_by_act(struct tcf_chain *chain)
746 {
747 __tcf_chain_put(chain, true, false);
748 }
749 EXPORT_SYMBOL(tcf_chain_put_by_act);
750
751 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
752 {
753 __tcf_chain_put(chain, false, true);
754 }
755
756 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
757 {
758 struct tcf_proto *tp, *tp_next;
759
760 mutex_lock(&chain->filter_chain_lock);
761 tp = tcf_chain_dereference(chain->filter_chain, chain);
762 while (tp) {
763 tp_next = rcu_dereference_protected(tp->next, 1);
764 tcf_proto_signal_destroying(chain, tp);
765 tp = tp_next;
766 }
767 tp = tcf_chain_dereference(chain->filter_chain, chain);
768 RCU_INIT_POINTER(chain->filter_chain, NULL);
769 tcf_chain0_head_change(chain, NULL);
770 chain->flushing = true;
771 mutex_unlock(&chain->filter_chain_lock);
772
773 while (tp) {
774 tp_next = rcu_dereference_protected(tp->next, 1);
775 tcf_proto_put(tp, rtnl_held, NULL);
776 tp = tp_next;
777 }
778 }
779
780 static int tcf_block_setup(struct tcf_block *block,
781 struct flow_block_offload *bo);
782
783 static void tcf_block_offload_init(struct flow_block_offload *bo,
784 struct net_device *dev, struct Qdisc *sch,
785 enum flow_block_command command,
786 enum flow_block_binder_type binder_type,
787 struct flow_block *flow_block,
788 bool shared, struct netlink_ext_ack *extack)
789 {
790 bo->net = dev_net(dev);
791 bo->command = command;
792 bo->binder_type = binder_type;
793 bo->block = flow_block;
794 bo->block_shared = shared;
795 bo->extack = extack;
796 bo->sch = sch;
797 bo->cb_list_head = &flow_block->cb_list;
798 INIT_LIST_HEAD(&bo->cb_list);
799 }
800
801 static void tcf_block_unbind(struct tcf_block *block,
802 struct flow_block_offload *bo);
803
804 static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
805 {
806 struct tcf_block *block = block_cb->indr.data;
807 struct net_device *dev = block_cb->indr.dev;
808 struct Qdisc *sch = block_cb->indr.sch;
809 struct netlink_ext_ack extack = {};
810 struct flow_block_offload bo = {};
811
812 tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND,
813 block_cb->indr.binder_type,
814 &block->flow_block, tcf_block_shared(block),
815 &extack);
816 rtnl_lock();
817 down_write(&block->cb_lock);
818 list_del(&block_cb->driver_list);
819 list_move(&block_cb->list, &bo.cb_list);
820 tcf_block_unbind(block, &bo);
821 up_write(&block->cb_lock);
822 rtnl_unlock();
823 }
824
825 static bool tcf_block_offload_in_use(struct tcf_block *block)
826 {
827 return atomic_read(&block->offloadcnt);
828 }
829
830 static int tcf_block_offload_cmd(struct tcf_block *block,
831 struct net_device *dev, struct Qdisc *sch,
832 struct tcf_block_ext_info *ei,
833 enum flow_block_command command,
834 struct netlink_ext_ack *extack)
835 {
836 struct flow_block_offload bo = {};
837
838 tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type,
839 &block->flow_block, tcf_block_shared(block),
840 extack);
841
842 if (dev->netdev_ops->ndo_setup_tc) {
843 int err;
844
845 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
846 if (err < 0) {
847 if (err != -EOPNOTSUPP)
848 NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
849 return err;
850 }
851
852 return tcf_block_setup(block, &bo);
853 }
854
855 flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo,
856 tc_block_indr_cleanup);
857 tcf_block_setup(block, &bo);
858
859 return -EOPNOTSUPP;
860 }
861
862 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
863 struct tcf_block_ext_info *ei,
864 struct netlink_ext_ack *extack)
865 {
866 struct net_device *dev = q->dev_queue->dev;
867 int err;
868
869 down_write(&block->cb_lock);
870
871 /* If tc offload feature is disabled and the block we try to bind
872 * to already has some offloaded filters, forbid to bind.
873 */
874 if (dev->netdev_ops->ndo_setup_tc &&
875 !tc_can_offload(dev) &&
876 tcf_block_offload_in_use(block)) {
877 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
878 err = -EOPNOTSUPP;
879 goto err_unlock;
880 }
881
882 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack);
883 if (err == -EOPNOTSUPP)
884 goto no_offload_dev_inc;
885 if (err)
886 goto err_unlock;
887
888 up_write(&block->cb_lock);
889 return 0;
890
891 no_offload_dev_inc:
892 if (tcf_block_offload_in_use(block))
893 goto err_unlock;
894
895 err = 0;
896 block->nooffloaddevcnt++;
897 err_unlock:
898 up_write(&block->cb_lock);
899 return err;
900 }
901
902 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
903 struct tcf_block_ext_info *ei)
904 {
905 struct net_device *dev = q->dev_queue->dev;
906 int err;
907
908 down_write(&block->cb_lock);
909 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL);
910 if (err == -EOPNOTSUPP)
911 goto no_offload_dev_dec;
912 up_write(&block->cb_lock);
913 return;
914
915 no_offload_dev_dec:
916 WARN_ON(block->nooffloaddevcnt-- == 0);
917 up_write(&block->cb_lock);
918 }
919
920 static int
921 tcf_chain0_head_change_cb_add(struct tcf_block *block,
922 struct tcf_block_ext_info *ei,
923 struct netlink_ext_ack *extack)
924 {
925 struct tcf_filter_chain_list_item *item;
926 struct tcf_chain *chain0;
927
928 item = kmalloc(sizeof(*item), GFP_KERNEL);
929 if (!item) {
930 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
931 return -ENOMEM;
932 }
933 item->chain_head_change = ei->chain_head_change;
934 item->chain_head_change_priv = ei->chain_head_change_priv;
935
936 mutex_lock(&block->lock);
937 chain0 = block->chain0.chain;
938 if (chain0)
939 tcf_chain_hold(chain0);
940 else
941 list_add(&item->list, &block->chain0.filter_chain_list);
942 mutex_unlock(&block->lock);
943
944 if (chain0) {
945 struct tcf_proto *tp_head;
946
947 mutex_lock(&chain0->filter_chain_lock);
948
949 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
950 if (tp_head)
951 tcf_chain_head_change_item(item, tp_head);
952
953 mutex_lock(&block->lock);
954 list_add(&item->list, &block->chain0.filter_chain_list);
955 mutex_unlock(&block->lock);
956
957 mutex_unlock(&chain0->filter_chain_lock);
958 tcf_chain_put(chain0);
959 }
960
961 return 0;
962 }
963
964 static void
965 tcf_chain0_head_change_cb_del(struct tcf_block *block,
966 struct tcf_block_ext_info *ei)
967 {
968 struct tcf_filter_chain_list_item *item;
969
970 mutex_lock(&block->lock);
971 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
972 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
973 (item->chain_head_change == ei->chain_head_change &&
974 item->chain_head_change_priv == ei->chain_head_change_priv)) {
975 if (block->chain0.chain)
976 tcf_chain_head_change_item(item, NULL);
977 list_del(&item->list);
978 mutex_unlock(&block->lock);
979
980 kfree(item);
981 return;
982 }
983 }
984 mutex_unlock(&block->lock);
985 WARN_ON(1);
986 }
987
988 struct tcf_net {
989 spinlock_t idr_lock; /* Protects idr */
990 struct idr idr;
991 };
992
993 static unsigned int tcf_net_id;
994
995 static int tcf_block_insert(struct tcf_block *block, struct net *net,
996 struct netlink_ext_ack *extack)
997 {
998 struct tcf_net *tn = net_generic(net, tcf_net_id);
999 int err;
1000
1001 idr_preload(GFP_KERNEL);
1002 spin_lock(&tn->idr_lock);
1003 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
1004 GFP_NOWAIT);
1005 spin_unlock(&tn->idr_lock);
1006 idr_preload_end();
1007
1008 return err;
1009 }
1010
1011 static void tcf_block_remove(struct tcf_block *block, struct net *net)
1012 {
1013 struct tcf_net *tn = net_generic(net, tcf_net_id);
1014
1015 spin_lock(&tn->idr_lock);
1016 idr_remove(&tn->idr, block->index);
1017 spin_unlock(&tn->idr_lock);
1018 }
1019
1020 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
1021 u32 block_index,
1022 struct netlink_ext_ack *extack)
1023 {
1024 struct tcf_block *block;
1025
1026 block = kzalloc(sizeof(*block), GFP_KERNEL);
1027 if (!block) {
1028 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
1029 return ERR_PTR(-ENOMEM);
1030 }
1031 mutex_init(&block->lock);
1032 mutex_init(&block->proto_destroy_lock);
1033 init_rwsem(&block->cb_lock);
1034 flow_block_init(&block->flow_block);
1035 INIT_LIST_HEAD(&block->chain_list);
1036 INIT_LIST_HEAD(&block->owner_list);
1037 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
1038
1039 refcount_set(&block->refcnt, 1);
1040 block->net = net;
1041 block->index = block_index;
1042 xa_init(&block->ports);
1043
1044 /* Don't store q pointer for blocks which are shared */
1045 if (!tcf_block_shared(block))
1046 block->q = q;
1047 return block;
1048 }
1049
1050 struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
1051 {
1052 struct tcf_net *tn = net_generic(net, tcf_net_id);
1053
1054 return idr_find(&tn->idr, block_index);
1055 }
1056 EXPORT_SYMBOL(tcf_block_lookup);
1057
1058 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
1059 {
1060 struct tcf_block *block;
1061
1062 rcu_read_lock();
1063 block = tcf_block_lookup(net, block_index);
1064 if (block && !refcount_inc_not_zero(&block->refcnt))
1065 block = NULL;
1066 rcu_read_unlock();
1067
1068 return block;
1069 }
1070
1071 static struct tcf_chain *
1072 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1073 {
1074 mutex_lock(&block->lock);
1075 if (chain)
1076 chain = list_is_last(&chain->list, &block->chain_list) ?
1077 NULL : list_next_entry(chain, list);
1078 else
1079 chain = list_first_entry_or_null(&block->chain_list,
1080 struct tcf_chain, list);
1081
1082 /* skip all action-only chains */
1083 while (chain && tcf_chain_held_by_acts_only(chain))
1084 chain = list_is_last(&chain->list, &block->chain_list) ?
1085 NULL : list_next_entry(chain, list);
1086
1087 if (chain)
1088 tcf_chain_hold(chain);
1089 mutex_unlock(&block->lock);
1090
1091 return chain;
1092 }
1093
1094 /* Function to be used by all clients that want to iterate over all chains on
1095 * block. It properly obtains block->lock and takes reference to chain before
1096 * returning it. Users of this function must be tolerant to concurrent chain
1097 * insertion/deletion or ensure that no concurrent chain modification is
1098 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1099 * consistent dump because rtnl lock is released each time skb is filled with
1100 * data and sent to user-space.
1101 */
1102
1103 struct tcf_chain *
1104 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1105 {
1106 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1107
1108 if (chain)
1109 tcf_chain_put(chain);
1110
1111 return chain_next;
1112 }
1113 EXPORT_SYMBOL(tcf_get_next_chain);
1114
1115 static struct tcf_proto *
1116 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1117 {
1118 u32 prio = 0;
1119
1120 ASSERT_RTNL();
1121 mutex_lock(&chain->filter_chain_lock);
1122
1123 if (!tp) {
1124 tp = tcf_chain_dereference(chain->filter_chain, chain);
1125 } else if (tcf_proto_is_deleting(tp)) {
1126 /* 'deleting' flag is set and chain->filter_chain_lock was
1127 * unlocked, which means next pointer could be invalid. Restart
1128 * search.
1129 */
1130 prio = tp->prio + 1;
1131 tp = tcf_chain_dereference(chain->filter_chain, chain);
1132
1133 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1134 if (!tp->deleting && tp->prio >= prio)
1135 break;
1136 } else {
1137 tp = tcf_chain_dereference(tp->next, chain);
1138 }
1139
1140 if (tp)
1141 tcf_proto_get(tp);
1142
1143 mutex_unlock(&chain->filter_chain_lock);
1144
1145 return tp;
1146 }
1147
1148 /* Function to be used by all clients that want to iterate over all tp's on
1149 * chain. Users of this function must be tolerant to concurrent tp
1150 * insertion/deletion or ensure that no concurrent chain modification is
1151 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1152 * consistent dump because rtnl lock is released each time skb is filled with
1153 * data and sent to user-space.
1154 */
1155
1156 struct tcf_proto *
1157 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1158 {
1159 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1160
1161 if (tp)
1162 tcf_proto_put(tp, true, NULL);
1163
1164 return tp_next;
1165 }
1166 EXPORT_SYMBOL(tcf_get_next_proto);
1167
1168 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1169 {
1170 struct tcf_chain *chain;
1171
1172 /* Last reference to block. At this point chains cannot be added or
1173 * removed concurrently.
1174 */
1175 for (chain = tcf_get_next_chain(block, NULL);
1176 chain;
1177 chain = tcf_get_next_chain(block, chain)) {
1178 tcf_chain_put_explicitly_created(chain);
1179 tcf_chain_flush(chain, rtnl_held);
1180 }
1181 }
1182
1183 /* Lookup Qdisc and increments its reference counter.
1184 * Set parent, if necessary.
1185 */
1186
1187 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1188 u32 *parent, int ifindex, bool rtnl_held,
1189 struct netlink_ext_ack *extack)
1190 {
1191 const struct Qdisc_class_ops *cops;
1192 struct net_device *dev;
1193 int err = 0;
1194
1195 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1196 return 0;
1197
1198 rcu_read_lock();
1199
1200 /* Find link */
1201 dev = dev_get_by_index_rcu(net, ifindex);
1202 if (!dev) {
1203 rcu_read_unlock();
1204 return -ENODEV;
1205 }
1206
1207 /* Find qdisc */
1208 if (!*parent) {
1209 *q = rcu_dereference(dev->qdisc);
1210 *parent = (*q)->handle;
1211 } else {
1212 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1213 if (!*q) {
1214 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1215 err = -EINVAL;
1216 goto errout_rcu;
1217 }
1218 }
1219
1220 *q = qdisc_refcount_inc_nz(*q);
1221 if (!*q) {
1222 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1223 err = -EINVAL;
1224 goto errout_rcu;
1225 }
1226
1227 /* Is it classful? */
1228 cops = (*q)->ops->cl_ops;
1229 if (!cops) {
1230 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1231 err = -EINVAL;
1232 goto errout_qdisc;
1233 }
1234
1235 if (!cops->tcf_block) {
1236 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1237 err = -EOPNOTSUPP;
1238 goto errout_qdisc;
1239 }
1240
1241 errout_rcu:
1242 /* At this point we know that qdisc is not noop_qdisc,
1243 * which means that qdisc holds a reference to net_device
1244 * and we hold a reference to qdisc, so it is safe to release
1245 * rcu read lock.
1246 */
1247 rcu_read_unlock();
1248 return err;
1249
1250 errout_qdisc:
1251 rcu_read_unlock();
1252
1253 if (rtnl_held)
1254 qdisc_put(*q);
1255 else
1256 qdisc_put_unlocked(*q);
1257 *q = NULL;
1258
1259 return err;
1260 }
1261
1262 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1263 int ifindex, struct netlink_ext_ack *extack)
1264 {
1265 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1266 return 0;
1267
1268 /* Do we search for filter, attached to class? */
1269 if (TC_H_MIN(parent)) {
1270 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1271
1272 *cl = cops->find(q, parent);
1273 if (*cl == 0) {
1274 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1275 return -ENOENT;
1276 }
1277 }
1278
1279 return 0;
1280 }
1281
1282 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1283 unsigned long cl, int ifindex,
1284 u32 block_index,
1285 struct netlink_ext_ack *extack)
1286 {
1287 struct tcf_block *block;
1288
1289 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1290 block = tcf_block_refcnt_get(net, block_index);
1291 if (!block) {
1292 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1293 return ERR_PTR(-EINVAL);
1294 }
1295 } else {
1296 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1297
1298 block = cops->tcf_block(q, cl, extack);
1299 if (!block)
1300 return ERR_PTR(-EINVAL);
1301
1302 if (tcf_block_shared(block)) {
1303 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1304 return ERR_PTR(-EOPNOTSUPP);
1305 }
1306
1307 /* Always take reference to block in order to support execution
1308 * of rules update path of cls API without rtnl lock. Caller
1309 * must release block when it is finished using it. 'if' block
1310 * of this conditional obtain reference to block by calling
1311 * tcf_block_refcnt_get().
1312 */
1313 refcount_inc(&block->refcnt);
1314 }
1315
1316 return block;
1317 }
1318
1319 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1320 struct tcf_block_ext_info *ei, bool rtnl_held)
1321 {
1322 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1323 /* Flushing/putting all chains will cause the block to be
1324 * deallocated when last chain is freed. However, if chain_list
1325 * is empty, block has to be manually deallocated. After block
1326 * reference counter reached 0, it is no longer possible to
1327 * increment it or add new chains to block.
1328 */
1329 bool free_block = list_empty(&block->chain_list);
1330
1331 mutex_unlock(&block->lock);
1332 if (tcf_block_shared(block))
1333 tcf_block_remove(block, block->net);
1334
1335 if (q)
1336 tcf_block_offload_unbind(block, q, ei);
1337
1338 if (free_block)
1339 tcf_block_destroy(block);
1340 else
1341 tcf_block_flush_all_chains(block, rtnl_held);
1342 } else if (q) {
1343 tcf_block_offload_unbind(block, q, ei);
1344 }
1345 }
1346
1347 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1348 {
1349 __tcf_block_put(block, NULL, NULL, rtnl_held);
1350 }
1351
1352 /* Find tcf block.
1353 * Set q, parent, cl when appropriate.
1354 */
1355
1356 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1357 u32 *parent, unsigned long *cl,
1358 int ifindex, u32 block_index,
1359 struct netlink_ext_ack *extack)
1360 {
1361 struct tcf_block *block;
1362 int err = 0;
1363
1364 ASSERT_RTNL();
1365
1366 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1367 if (err)
1368 goto errout;
1369
1370 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1371 if (err)
1372 goto errout_qdisc;
1373
1374 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1375 if (IS_ERR(block)) {
1376 err = PTR_ERR(block);
1377 goto errout_qdisc;
1378 }
1379
1380 return block;
1381
1382 errout_qdisc:
1383 if (*q)
1384 qdisc_put(*q);
1385 errout:
1386 *q = NULL;
1387 return ERR_PTR(err);
1388 }
1389
1390 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1391 bool rtnl_held)
1392 {
1393 if (!IS_ERR_OR_NULL(block))
1394 tcf_block_refcnt_put(block, rtnl_held);
1395
1396 if (q) {
1397 if (rtnl_held)
1398 qdisc_put(q);
1399 else
1400 qdisc_put_unlocked(q);
1401 }
1402 }
1403
1404 struct tcf_block_owner_item {
1405 struct list_head list;
1406 struct Qdisc *q;
1407 enum flow_block_binder_type binder_type;
1408 };
1409
1410 static void
1411 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1412 struct Qdisc *q,
1413 enum flow_block_binder_type binder_type)
1414 {
1415 if (block->keep_dst &&
1416 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1417 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1418 netif_keep_dst(qdisc_dev(q));
1419 }
1420
1421 void tcf_block_netif_keep_dst(struct tcf_block *block)
1422 {
1423 struct tcf_block_owner_item *item;
1424
1425 block->keep_dst = true;
1426 list_for_each_entry(item, &block->owner_list, list)
1427 tcf_block_owner_netif_keep_dst(block, item->q,
1428 item->binder_type);
1429 }
1430 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1431
1432 static int tcf_block_owner_add(struct tcf_block *block,
1433 struct Qdisc *q,
1434 enum flow_block_binder_type binder_type)
1435 {
1436 struct tcf_block_owner_item *item;
1437
1438 item = kmalloc(sizeof(*item), GFP_KERNEL);
1439 if (!item)
1440 return -ENOMEM;
1441 item->q = q;
1442 item->binder_type = binder_type;
1443 list_add(&item->list, &block->owner_list);
1444 return 0;
1445 }
1446
1447 static void tcf_block_owner_del(struct tcf_block *block,
1448 struct Qdisc *q,
1449 enum flow_block_binder_type binder_type)
1450 {
1451 struct tcf_block_owner_item *item;
1452
1453 list_for_each_entry(item, &block->owner_list, list) {
1454 if (item->q == q && item->binder_type == binder_type) {
1455 list_del(&item->list);
1456 kfree(item);
1457 return;
1458 }
1459 }
1460 WARN_ON(1);
1461 }
1462
1463 static bool tcf_block_tracks_dev(struct tcf_block *block,
1464 struct tcf_block_ext_info *ei)
1465 {
1466 return tcf_block_shared(block) &&
1467 (ei->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS ||
1468 ei->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS);
1469 }
1470
1471 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1472 struct tcf_block_ext_info *ei,
1473 struct netlink_ext_ack *extack)
1474 {
1475 struct net_device *dev = qdisc_dev(q);
1476 struct net *net = qdisc_net(q);
1477 struct tcf_block *block = NULL;
1478 int err;
1479
1480 if (ei->block_index)
1481 /* block_index not 0 means the shared block is requested */
1482 block = tcf_block_refcnt_get(net, ei->block_index);
1483
1484 if (!block) {
1485 block = tcf_block_create(net, q, ei->block_index, extack);
1486 if (IS_ERR(block))
1487 return PTR_ERR(block);
1488 if (tcf_block_shared(block)) {
1489 err = tcf_block_insert(block, net, extack);
1490 if (err)
1491 goto err_block_insert;
1492 }
1493 }
1494
1495 err = tcf_block_owner_add(block, q, ei->binder_type);
1496 if (err)
1497 goto err_block_owner_add;
1498
1499 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1500
1501 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1502 if (err)
1503 goto err_chain0_head_change_cb_add;
1504
1505 err = tcf_block_offload_bind(block, q, ei, extack);
1506 if (err)
1507 goto err_block_offload_bind;
1508
1509 if (tcf_block_tracks_dev(block, ei)) {
1510 err = xa_insert(&block->ports, dev->ifindex, dev, GFP_KERNEL);
1511 if (err) {
1512 NL_SET_ERR_MSG(extack, "block dev insert failed");
1513 goto err_dev_insert;
1514 }
1515 }
1516
1517 *p_block = block;
1518 return 0;
1519
1520 err_dev_insert:
1521 tcf_block_offload_unbind(block, q, ei);
1522 err_block_offload_bind:
1523 tcf_chain0_head_change_cb_del(block, ei);
1524 err_chain0_head_change_cb_add:
1525 tcf_block_owner_del(block, q, ei->binder_type);
1526 err_block_owner_add:
1527 err_block_insert:
1528 tcf_block_refcnt_put(block, true);
1529 return err;
1530 }
1531 EXPORT_SYMBOL(tcf_block_get_ext);
1532
1533 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1534 {
1535 struct tcf_proto __rcu **p_filter_chain = priv;
1536
1537 rcu_assign_pointer(*p_filter_chain, tp_head);
1538 }
1539
1540 int tcf_block_get(struct tcf_block **p_block,
1541 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1542 struct netlink_ext_ack *extack)
1543 {
1544 struct tcf_block_ext_info ei = {
1545 .chain_head_change = tcf_chain_head_change_dflt,
1546 .chain_head_change_priv = p_filter_chain,
1547 };
1548
1549 WARN_ON(!p_filter_chain);
1550 return tcf_block_get_ext(p_block, q, &ei, extack);
1551 }
1552 EXPORT_SYMBOL(tcf_block_get);
1553
1554 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1555 * actions should be all removed after flushing.
1556 */
1557 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1558 struct tcf_block_ext_info *ei)
1559 {
1560 struct net_device *dev = qdisc_dev(q);
1561
1562 if (!block)
1563 return;
1564 if (tcf_block_tracks_dev(block, ei))
1565 xa_erase(&block->ports, dev->ifindex);
1566 tcf_chain0_head_change_cb_del(block, ei);
1567 tcf_block_owner_del(block, q, ei->binder_type);
1568
1569 __tcf_block_put(block, q, ei, true);
1570 }
1571 EXPORT_SYMBOL(tcf_block_put_ext);
1572
1573 void tcf_block_put(struct tcf_block *block)
1574 {
1575 struct tcf_block_ext_info ei = {0, };
1576
1577 if (!block)
1578 return;
1579 tcf_block_put_ext(block, block->q, &ei);
1580 }
1581
1582 EXPORT_SYMBOL(tcf_block_put);
1583
1584 static int
1585 tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
1586 void *cb_priv, bool add, bool offload_in_use,
1587 struct netlink_ext_ack *extack)
1588 {
1589 struct tcf_chain *chain, *chain_prev;
1590 struct tcf_proto *tp, *tp_prev;
1591 int err;
1592
1593 lockdep_assert_held(&block->cb_lock);
1594
1595 for (chain = __tcf_get_next_chain(block, NULL);
1596 chain;
1597 chain_prev = chain,
1598 chain = __tcf_get_next_chain(block, chain),
1599 tcf_chain_put(chain_prev)) {
1600 if (chain->tmplt_ops && add)
1601 chain->tmplt_ops->tmplt_reoffload(chain, true, cb,
1602 cb_priv);
1603 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1604 tp_prev = tp,
1605 tp = __tcf_get_next_proto(chain, tp),
1606 tcf_proto_put(tp_prev, true, NULL)) {
1607 if (tp->ops->reoffload) {
1608 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1609 extack);
1610 if (err && add)
1611 goto err_playback_remove;
1612 } else if (add && offload_in_use) {
1613 err = -EOPNOTSUPP;
1614 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1615 goto err_playback_remove;
1616 }
1617 }
1618 if (chain->tmplt_ops && !add)
1619 chain->tmplt_ops->tmplt_reoffload(chain, false, cb,
1620 cb_priv);
1621 }
1622
1623 return 0;
1624
1625 err_playback_remove:
1626 tcf_proto_put(tp, true, NULL);
1627 tcf_chain_put(chain);
1628 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1629 extack);
1630 return err;
1631 }
1632
1633 static int tcf_block_bind(struct tcf_block *block,
1634 struct flow_block_offload *bo)
1635 {
1636 struct flow_block_cb *block_cb, *next;
1637 int err, i = 0;
1638
1639 lockdep_assert_held(&block->cb_lock);
1640
1641 list_for_each_entry(block_cb, &bo->cb_list, list) {
1642 err = tcf_block_playback_offloads(block, block_cb->cb,
1643 block_cb->cb_priv, true,
1644 tcf_block_offload_in_use(block),
1645 bo->extack);
1646 if (err)
1647 goto err_unroll;
1648 if (!bo->unlocked_driver_cb)
1649 block->lockeddevcnt++;
1650
1651 i++;
1652 }
1653 list_splice(&bo->cb_list, &block->flow_block.cb_list);
1654
1655 return 0;
1656
1657 err_unroll:
1658 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1659 list_del(&block_cb->driver_list);
1660 if (i-- > 0) {
1661 list_del(&block_cb->list);
1662 tcf_block_playback_offloads(block, block_cb->cb,
1663 block_cb->cb_priv, false,
1664 tcf_block_offload_in_use(block),
1665 NULL);
1666 if (!bo->unlocked_driver_cb)
1667 block->lockeddevcnt--;
1668 }
1669 flow_block_cb_free(block_cb);
1670 }
1671
1672 return err;
1673 }
1674
1675 static void tcf_block_unbind(struct tcf_block *block,
1676 struct flow_block_offload *bo)
1677 {
1678 struct flow_block_cb *block_cb, *next;
1679
1680 lockdep_assert_held(&block->cb_lock);
1681
1682 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1683 tcf_block_playback_offloads(block, block_cb->cb,
1684 block_cb->cb_priv, false,
1685 tcf_block_offload_in_use(block),
1686 NULL);
1687 list_del(&block_cb->list);
1688 flow_block_cb_free(block_cb);
1689 if (!bo->unlocked_driver_cb)
1690 block->lockeddevcnt--;
1691 }
1692 }
1693
1694 static int tcf_block_setup(struct tcf_block *block,
1695 struct flow_block_offload *bo)
1696 {
1697 int err;
1698
1699 switch (bo->command) {
1700 case FLOW_BLOCK_BIND:
1701 err = tcf_block_bind(block, bo);
1702 break;
1703 case FLOW_BLOCK_UNBIND:
1704 err = 0;
1705 tcf_block_unbind(block, bo);
1706 break;
1707 default:
1708 WARN_ON_ONCE(1);
1709 err = -EOPNOTSUPP;
1710 }
1711
1712 return err;
1713 }
1714
1715 /* Main classifier routine: scans classifier chain attached
1716 * to this qdisc, (optionally) tests for protocol and asks
1717 * specific classifiers.
1718 */
1719 static inline int __tcf_classify(struct sk_buff *skb,
1720 const struct tcf_proto *tp,
1721 const struct tcf_proto *orig_tp,
1722 struct tcf_result *res,
1723 bool compat_mode,
1724 struct tcf_exts_miss_cookie_node *n,
1725 int act_index,
1726 u32 *last_executed_chain)
1727 {
1728 #ifdef CONFIG_NET_CLS_ACT
1729 const int max_reclassify_loop = 16;
1730 const struct tcf_proto *first_tp;
1731 int limit = 0;
1732
1733 reclassify:
1734 #endif
1735 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1736 __be16 protocol = skb_protocol(skb, false);
1737 int err = 0;
1738
1739 if (n) {
1740 struct tcf_exts *exts;
1741
1742 if (n->tp_prio != tp->prio)
1743 continue;
1744
1745 /* We re-lookup the tp and chain based on index instead
1746 * of having hard refs and locks to them, so do a sanity
1747 * check if any of tp,chain,exts was replaced by the
1748 * time we got here with a cookie from hardware.
1749 */
1750 if (unlikely(n->tp != tp || n->tp->chain != n->chain ||
1751 !tp->ops->get_exts)) {
1752 tcf_set_drop_reason(skb,
1753 SKB_DROP_REASON_TC_COOKIE_ERROR);
1754 return TC_ACT_SHOT;
1755 }
1756
1757 exts = tp->ops->get_exts(tp, n->handle);
1758 if (unlikely(!exts || n->exts != exts)) {
1759 tcf_set_drop_reason(skb,
1760 SKB_DROP_REASON_TC_COOKIE_ERROR);
1761 return TC_ACT_SHOT;
1762 }
1763
1764 n = NULL;
1765 err = tcf_exts_exec_ex(skb, exts, act_index, res);
1766 } else {
1767 if (tp->protocol != protocol &&
1768 tp->protocol != htons(ETH_P_ALL))
1769 continue;
1770
1771 err = tc_classify(skb, tp, res);
1772 }
1773 #ifdef CONFIG_NET_CLS_ACT
1774 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1775 first_tp = orig_tp;
1776 *last_executed_chain = first_tp->chain->index;
1777 goto reset;
1778 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1779 first_tp = res->goto_tp;
1780 *last_executed_chain = err & TC_ACT_EXT_VAL_MASK;
1781 goto reset;
1782 }
1783 #endif
1784 if (err >= 0)
1785 return err;
1786 }
1787
1788 if (unlikely(n)) {
1789 tcf_set_drop_reason(skb,
1790 SKB_DROP_REASON_TC_COOKIE_ERROR);
1791 return TC_ACT_SHOT;
1792 }
1793
1794 return TC_ACT_UNSPEC; /* signal: continue lookup */
1795 #ifdef CONFIG_NET_CLS_ACT
1796 reset:
1797 if (unlikely(limit++ >= max_reclassify_loop)) {
1798 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1799 tp->chain->block->index,
1800 tp->prio & 0xffff,
1801 ntohs(tp->protocol));
1802 tcf_set_drop_reason(skb,
1803 SKB_DROP_REASON_TC_RECLASSIFY_LOOP);
1804 return TC_ACT_SHOT;
1805 }
1806
1807 tp = first_tp;
1808 goto reclassify;
1809 #endif
1810 }
1811
1812 int tcf_classify(struct sk_buff *skb,
1813 const struct tcf_block *block,
1814 const struct tcf_proto *tp,
1815 struct tcf_result *res, bool compat_mode)
1816 {
1817 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1818 u32 last_executed_chain = 0;
1819
1820 return __tcf_classify(skb, tp, tp, res, compat_mode, NULL, 0,
1821 &last_executed_chain);
1822 #else
1823 u32 last_executed_chain = tp ? tp->chain->index : 0;
1824 struct tcf_exts_miss_cookie_node *n = NULL;
1825 const struct tcf_proto *orig_tp = tp;
1826 struct tc_skb_ext *ext;
1827 int act_index = 0;
1828 int ret;
1829
1830 if (block) {
1831 ext = skb_ext_find(skb, TC_SKB_EXT);
1832
1833 if (ext && (ext->chain || ext->act_miss)) {
1834 struct tcf_chain *fchain;
1835 u32 chain;
1836
1837 if (ext->act_miss) {
1838 n = tcf_exts_miss_cookie_lookup(ext->act_miss_cookie,
1839 &act_index);
1840 if (!n) {
1841 tcf_set_drop_reason(skb,
1842 SKB_DROP_REASON_TC_COOKIE_ERROR);
1843 return TC_ACT_SHOT;
1844 }
1845
1846 chain = n->chain_index;
1847 } else {
1848 chain = ext->chain;
1849 }
1850
1851 fchain = tcf_chain_lookup_rcu(block, chain);
1852 if (!fchain) {
1853 tcf_set_drop_reason(skb,
1854 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1855
1856 return TC_ACT_SHOT;
1857 }
1858
1859 /* Consume, so cloned/redirect skbs won't inherit ext */
1860 skb_ext_del(skb, TC_SKB_EXT);
1861
1862 tp = rcu_dereference_bh(fchain->filter_chain);
1863 last_executed_chain = fchain->index;
1864 }
1865 }
1866
1867 ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode, n, act_index,
1868 &last_executed_chain);
1869
1870 if (tc_skb_ext_tc_enabled()) {
1871 /* If we missed on some chain */
1872 if (ret == TC_ACT_UNSPEC && last_executed_chain) {
1873 struct tc_skb_cb *cb = tc_skb_cb(skb);
1874
1875 ext = tc_skb_ext_alloc(skb);
1876 if (WARN_ON_ONCE(!ext)) {
1877 tcf_set_drop_reason(skb, SKB_DROP_REASON_NOMEM);
1878 return TC_ACT_SHOT;
1879 }
1880 ext->chain = last_executed_chain;
1881 ext->mru = cb->mru;
1882 ext->post_ct = cb->post_ct;
1883 ext->post_ct_snat = cb->post_ct_snat;
1884 ext->post_ct_dnat = cb->post_ct_dnat;
1885 ext->zone = cb->zone;
1886 }
1887 }
1888
1889 return ret;
1890 #endif
1891 }
1892 EXPORT_SYMBOL(tcf_classify);
1893
1894 struct tcf_chain_info {
1895 struct tcf_proto __rcu **pprev;
1896 struct tcf_proto __rcu *next;
1897 };
1898
1899 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1900 struct tcf_chain_info *chain_info)
1901 {
1902 return tcf_chain_dereference(*chain_info->pprev, chain);
1903 }
1904
1905 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1906 struct tcf_chain_info *chain_info,
1907 struct tcf_proto *tp)
1908 {
1909 if (chain->flushing)
1910 return -EAGAIN;
1911
1912 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1913 if (*chain_info->pprev == chain->filter_chain)
1914 tcf_chain0_head_change(chain, tp);
1915 tcf_proto_get(tp);
1916 rcu_assign_pointer(*chain_info->pprev, tp);
1917
1918 return 0;
1919 }
1920
1921 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1922 struct tcf_chain_info *chain_info,
1923 struct tcf_proto *tp)
1924 {
1925 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1926
1927 tcf_proto_mark_delete(tp);
1928 if (tp == chain->filter_chain)
1929 tcf_chain0_head_change(chain, next);
1930 RCU_INIT_POINTER(*chain_info->pprev, next);
1931 }
1932
1933 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1934 struct tcf_chain_info *chain_info,
1935 u32 protocol, u32 prio,
1936 bool prio_allocate,
1937 struct netlink_ext_ack *extack);
1938
1939 /* Try to insert new proto.
1940 * If proto with specified priority already exists, free new proto
1941 * and return existing one.
1942 */
1943
1944 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1945 struct tcf_proto *tp_new,
1946 u32 protocol, u32 prio,
1947 bool rtnl_held)
1948 {
1949 struct tcf_chain_info chain_info;
1950 struct tcf_proto *tp;
1951 int err = 0;
1952
1953 mutex_lock(&chain->filter_chain_lock);
1954
1955 if (tcf_proto_exists_destroying(chain, tp_new)) {
1956 mutex_unlock(&chain->filter_chain_lock);
1957 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1958 return ERR_PTR(-EAGAIN);
1959 }
1960
1961 tp = tcf_chain_tp_find(chain, &chain_info, protocol, prio, false, NULL);
1962 if (!tp)
1963 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1964 mutex_unlock(&chain->filter_chain_lock);
1965
1966 if (tp) {
1967 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1968 tp_new = tp;
1969 } else if (err) {
1970 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1971 tp_new = ERR_PTR(err);
1972 }
1973
1974 return tp_new;
1975 }
1976
1977 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1978 struct tcf_proto *tp, bool rtnl_held,
1979 struct netlink_ext_ack *extack)
1980 {
1981 struct tcf_chain_info chain_info;
1982 struct tcf_proto *tp_iter;
1983 struct tcf_proto **pprev;
1984 struct tcf_proto *next;
1985
1986 mutex_lock(&chain->filter_chain_lock);
1987
1988 /* Atomically find and remove tp from chain. */
1989 for (pprev = &chain->filter_chain;
1990 (tp_iter = tcf_chain_dereference(*pprev, chain));
1991 pprev = &tp_iter->next) {
1992 if (tp_iter == tp) {
1993 chain_info.pprev = pprev;
1994 chain_info.next = tp_iter->next;
1995 WARN_ON(tp_iter->deleting);
1996 break;
1997 }
1998 }
1999 /* Verify that tp still exists and no new filters were inserted
2000 * concurrently.
2001 * Mark tp for deletion if it is empty.
2002 */
2003 if (!tp_iter || !tcf_proto_check_delete(tp)) {
2004 mutex_unlock(&chain->filter_chain_lock);
2005 return;
2006 }
2007
2008 tcf_proto_signal_destroying(chain, tp);
2009 next = tcf_chain_dereference(chain_info.next, chain);
2010 if (tp == chain->filter_chain)
2011 tcf_chain0_head_change(chain, next);
2012 RCU_INIT_POINTER(*chain_info.pprev, next);
2013 mutex_unlock(&chain->filter_chain_lock);
2014
2015 tcf_proto_put(tp, rtnl_held, extack);
2016 }
2017
2018 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
2019 struct tcf_chain_info *chain_info,
2020 u32 protocol, u32 prio,
2021 bool prio_allocate,
2022 struct netlink_ext_ack *extack)
2023 {
2024 struct tcf_proto **pprev;
2025 struct tcf_proto *tp;
2026
2027 /* Check the chain for existence of proto-tcf with this priority */
2028 for (pprev = &chain->filter_chain;
2029 (tp = tcf_chain_dereference(*pprev, chain));
2030 pprev = &tp->next) {
2031 if (tp->prio >= prio) {
2032 if (tp->prio == prio) {
2033 if (prio_allocate) {
2034 NL_SET_ERR_MSG(extack, "Lowest ID from auto-alloc range already in use");
2035 return ERR_PTR(-ENOSPC);
2036 }
2037 if (tp->protocol != protocol && protocol) {
2038 NL_SET_ERR_MSG(extack, "Protocol mismatch for filter with specified priority");
2039 return ERR_PTR(-EINVAL);
2040 }
2041 } else {
2042 tp = NULL;
2043 }
2044 break;
2045 }
2046 }
2047 chain_info->pprev = pprev;
2048 if (tp) {
2049 chain_info->next = tp->next;
2050 tcf_proto_get(tp);
2051 } else {
2052 chain_info->next = NULL;
2053 }
2054 return tp;
2055 }
2056
2057 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
2058 struct tcf_proto *tp, struct tcf_block *block,
2059 struct Qdisc *q, u32 parent, void *fh,
2060 u32 portid, u32 seq, u16 flags, int event,
2061 bool terse_dump, bool rtnl_held,
2062 struct netlink_ext_ack *extack)
2063 {
2064 struct tcmsg *tcm;
2065 struct nlmsghdr *nlh;
2066 unsigned char *b = skb_tail_pointer(skb);
2067
2068 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2069 if (!nlh)
2070 goto out_nlmsg_trim;
2071 tcm = nlmsg_data(nlh);
2072 tcm->tcm_family = AF_UNSPEC;
2073 tcm->tcm__pad1 = 0;
2074 tcm->tcm__pad2 = 0;
2075 if (q) {
2076 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
2077 tcm->tcm_parent = parent;
2078 } else {
2079 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2080 tcm->tcm_block_index = block->index;
2081 }
2082 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
2083 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
2084 goto nla_put_failure;
2085 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
2086 goto nla_put_failure;
2087 if (!fh) {
2088 tcm->tcm_handle = 0;
2089 } else if (terse_dump) {
2090 if (tp->ops->terse_dump) {
2091 if (tp->ops->terse_dump(net, tp, fh, skb, tcm,
2092 rtnl_held) < 0)
2093 goto nla_put_failure;
2094 } else {
2095 goto cls_op_not_supp;
2096 }
2097 } else {
2098 if (tp->ops->dump &&
2099 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
2100 goto nla_put_failure;
2101 }
2102
2103 if (extack && extack->_msg &&
2104 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
2105 goto nla_put_failure;
2106
2107 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2108
2109 return skb->len;
2110
2111 out_nlmsg_trim:
2112 nla_put_failure:
2113 cls_op_not_supp:
2114 nlmsg_trim(skb, b);
2115 return -1;
2116 }
2117
2118 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
2119 struct nlmsghdr *n, struct tcf_proto *tp,
2120 struct tcf_block *block, struct Qdisc *q,
2121 u32 parent, void *fh, int event, bool unicast,
2122 bool rtnl_held, struct netlink_ext_ack *extack)
2123 {
2124 struct sk_buff *skb;
2125 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2126 int err = 0;
2127
2128 if (!unicast && !rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
2129 return 0;
2130
2131 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2132 if (!skb)
2133 return -ENOBUFS;
2134
2135 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
2136 n->nlmsg_seq, n->nlmsg_flags, event,
2137 false, rtnl_held, extack) <= 0) {
2138 kfree_skb(skb);
2139 return -EINVAL;
2140 }
2141
2142 if (unicast)
2143 err = rtnl_unicast(skb, net, portid);
2144 else
2145 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2146 n->nlmsg_flags & NLM_F_ECHO);
2147 return err;
2148 }
2149
2150 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
2151 struct nlmsghdr *n, struct tcf_proto *tp,
2152 struct tcf_block *block, struct Qdisc *q,
2153 u32 parent, void *fh, bool *last, bool rtnl_held,
2154 struct netlink_ext_ack *extack)
2155 {
2156 struct sk_buff *skb;
2157 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2158 int err;
2159
2160 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
2161 return tp->ops->delete(tp, fh, last, rtnl_held, extack);
2162
2163 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2164 if (!skb)
2165 return -ENOBUFS;
2166
2167 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
2168 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
2169 false, rtnl_held, extack) <= 0) {
2170 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
2171 kfree_skb(skb);
2172 return -EINVAL;
2173 }
2174
2175 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
2176 if (err) {
2177 kfree_skb(skb);
2178 return err;
2179 }
2180
2181 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2182 n->nlmsg_flags & NLM_F_ECHO);
2183 if (err < 0)
2184 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
2185
2186 return err;
2187 }
2188
2189 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
2190 struct tcf_block *block, struct Qdisc *q,
2191 u32 parent, struct nlmsghdr *n,
2192 struct tcf_chain *chain, int event,
2193 struct netlink_ext_ack *extack)
2194 {
2195 struct tcf_proto *tp;
2196
2197 for (tp = tcf_get_next_proto(chain, NULL);
2198 tp; tp = tcf_get_next_proto(chain, tp))
2199 tfilter_notify(net, oskb, n, tp, block, q, parent, NULL,
2200 event, false, true, extack);
2201 }
2202
2203 static void tfilter_put(struct tcf_proto *tp, void *fh)
2204 {
2205 if (tp->ops->put && fh)
2206 tp->ops->put(tp, fh);
2207 }
2208
2209 static bool is_qdisc_ingress(__u32 classid)
2210 {
2211 return (TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS));
2212 }
2213
2214 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2215 struct netlink_ext_ack *extack)
2216 {
2217 struct net *net = sock_net(skb->sk);
2218 struct nlattr *tca[TCA_MAX + 1];
2219 char name[IFNAMSIZ];
2220 struct tcmsg *t;
2221 u32 protocol;
2222 u32 prio;
2223 bool prio_allocate;
2224 u32 parent;
2225 u32 chain_index;
2226 struct Qdisc *q;
2227 struct tcf_chain_info chain_info;
2228 struct tcf_chain *chain;
2229 struct tcf_block *block;
2230 struct tcf_proto *tp;
2231 unsigned long cl;
2232 void *fh;
2233 int err;
2234 int tp_created;
2235 bool rtnl_held = false;
2236 u32 flags;
2237
2238 replay:
2239 tp_created = 0;
2240
2241 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2242 rtm_tca_policy, extack);
2243 if (err < 0)
2244 return err;
2245
2246 t = nlmsg_data(n);
2247 protocol = TC_H_MIN(t->tcm_info);
2248 prio = TC_H_MAJ(t->tcm_info);
2249 prio_allocate = false;
2250 parent = t->tcm_parent;
2251 tp = NULL;
2252 cl = 0;
2253 block = NULL;
2254 q = NULL;
2255 chain = NULL;
2256 flags = 0;
2257
2258 if (prio == 0) {
2259 /* If no priority is provided by the user,
2260 * we allocate one.
2261 */
2262 if (n->nlmsg_flags & NLM_F_CREATE) {
2263 prio = TC_H_MAKE(0x80000000U, 0U);
2264 prio_allocate = true;
2265 } else {
2266 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2267 return -ENOENT;
2268 }
2269 }
2270
2271 /* Find head of filter chain. */
2272
2273 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2274 if (err)
2275 return err;
2276
2277 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2278 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2279 err = -EINVAL;
2280 goto errout;
2281 }
2282
2283 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2284 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2285 * type is not specified, classifier is not unlocked.
2286 */
2287 if (rtnl_held ||
2288 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2289 !tcf_proto_is_unlocked(name)) {
2290 rtnl_held = true;
2291 rtnl_lock();
2292 }
2293
2294 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2295 if (err)
2296 goto errout;
2297
2298 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2299 extack);
2300 if (IS_ERR(block)) {
2301 err = PTR_ERR(block);
2302 goto errout;
2303 }
2304 block->classid = parent;
2305
2306 chain_index = nla_get_u32_default(tca[TCA_CHAIN], 0);
2307 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2308 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2309 err = -EINVAL;
2310 goto errout;
2311 }
2312 chain = tcf_chain_get(block, chain_index, true);
2313 if (!chain) {
2314 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2315 err = -ENOMEM;
2316 goto errout;
2317 }
2318
2319 mutex_lock(&chain->filter_chain_lock);
2320 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2321 prio, prio_allocate, extack);
2322 if (IS_ERR(tp)) {
2323 err = PTR_ERR(tp);
2324 goto errout_locked;
2325 }
2326
2327 if (tp == NULL) {
2328 struct tcf_proto *tp_new = NULL;
2329
2330 if (chain->flushing) {
2331 err = -EAGAIN;
2332 goto errout_locked;
2333 }
2334
2335 /* Proto-tcf does not exist, create new one */
2336
2337 if (tca[TCA_KIND] == NULL || !protocol) {
2338 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2339 err = -EINVAL;
2340 goto errout_locked;
2341 }
2342
2343 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2344 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2345 err = -ENOENT;
2346 goto errout_locked;
2347 }
2348
2349 if (prio_allocate)
2350 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2351 &chain_info));
2352
2353 mutex_unlock(&chain->filter_chain_lock);
2354 tp_new = tcf_proto_create(name, protocol, prio, chain,
2355 rtnl_held, extack);
2356 if (IS_ERR(tp_new)) {
2357 err = PTR_ERR(tp_new);
2358 goto errout_tp;
2359 }
2360
2361 tp_created = 1;
2362 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2363 rtnl_held);
2364 if (IS_ERR(tp)) {
2365 err = PTR_ERR(tp);
2366 goto errout_tp;
2367 }
2368 } else {
2369 mutex_unlock(&chain->filter_chain_lock);
2370 }
2371
2372 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2373 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2374 err = -EINVAL;
2375 goto errout;
2376 }
2377
2378 fh = tp->ops->get(tp, t->tcm_handle);
2379
2380 if (!fh) {
2381 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2382 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2383 err = -ENOENT;
2384 goto errout;
2385 }
2386 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2387 tfilter_put(tp, fh);
2388 NL_SET_ERR_MSG(extack, "Filter already exists");
2389 err = -EEXIST;
2390 goto errout;
2391 }
2392
2393 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2394 tfilter_put(tp, fh);
2395 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2396 err = -EINVAL;
2397 goto errout;
2398 }
2399
2400 if (!(n->nlmsg_flags & NLM_F_CREATE))
2401 flags |= TCA_ACT_FLAGS_REPLACE;
2402 if (!rtnl_held)
2403 flags |= TCA_ACT_FLAGS_NO_RTNL;
2404 if (is_qdisc_ingress(parent))
2405 flags |= TCA_ACT_FLAGS_AT_INGRESS;
2406 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2407 flags, extack);
2408 if (err == 0) {
2409 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2410 RTM_NEWTFILTER, false, rtnl_held, extack);
2411 tfilter_put(tp, fh);
2412 tcf_block_filter_cnt_update(block, &tp->counted, true);
2413 /* q pointer is NULL for shared blocks */
2414 if (q)
2415 q->flags &= ~TCQ_F_CAN_BYPASS;
2416 }
2417
2418 errout:
2419 if (err && tp_created)
2420 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2421 errout_tp:
2422 if (chain) {
2423 if (tp && !IS_ERR(tp))
2424 tcf_proto_put(tp, rtnl_held, NULL);
2425 if (!tp_created)
2426 tcf_chain_put(chain);
2427 }
2428 tcf_block_release(q, block, rtnl_held);
2429
2430 if (rtnl_held)
2431 rtnl_unlock();
2432
2433 if (err == -EAGAIN) {
2434 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2435 * of target chain.
2436 */
2437 rtnl_held = true;
2438 /* Replay the request. */
2439 goto replay;
2440 }
2441 return err;
2442
2443 errout_locked:
2444 mutex_unlock(&chain->filter_chain_lock);
2445 goto errout;
2446 }
2447
2448 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2449 struct netlink_ext_ack *extack)
2450 {
2451 struct net *net = sock_net(skb->sk);
2452 struct nlattr *tca[TCA_MAX + 1];
2453 char name[IFNAMSIZ];
2454 struct tcmsg *t;
2455 u32 protocol;
2456 u32 prio;
2457 u32 parent;
2458 u32 chain_index;
2459 struct Qdisc *q = NULL;
2460 struct tcf_chain_info chain_info;
2461 struct tcf_chain *chain = NULL;
2462 struct tcf_block *block = NULL;
2463 struct tcf_proto *tp = NULL;
2464 unsigned long cl = 0;
2465 void *fh = NULL;
2466 int err;
2467 bool rtnl_held = false;
2468
2469 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2470 rtm_tca_policy, extack);
2471 if (err < 0)
2472 return err;
2473
2474 t = nlmsg_data(n);
2475 protocol = TC_H_MIN(t->tcm_info);
2476 prio = TC_H_MAJ(t->tcm_info);
2477 parent = t->tcm_parent;
2478
2479 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2480 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2481 return -ENOENT;
2482 }
2483
2484 /* Find head of filter chain. */
2485
2486 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2487 if (err)
2488 return err;
2489
2490 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2491 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2492 err = -EINVAL;
2493 goto errout;
2494 }
2495 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2496 * found), qdisc is not unlocked, classifier type is not specified,
2497 * classifier is not unlocked.
2498 */
2499 if (!prio ||
2500 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2501 !tcf_proto_is_unlocked(name)) {
2502 rtnl_held = true;
2503 rtnl_lock();
2504 }
2505
2506 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2507 if (err)
2508 goto errout;
2509
2510 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2511 extack);
2512 if (IS_ERR(block)) {
2513 err = PTR_ERR(block);
2514 goto errout;
2515 }
2516
2517 chain_index = nla_get_u32_default(tca[TCA_CHAIN], 0);
2518 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2519 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2520 err = -EINVAL;
2521 goto errout;
2522 }
2523 chain = tcf_chain_get(block, chain_index, false);
2524 if (!chain) {
2525 /* User requested flush on non-existent chain. Nothing to do,
2526 * so just return success.
2527 */
2528 if (prio == 0) {
2529 err = 0;
2530 goto errout;
2531 }
2532 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2533 err = -ENOENT;
2534 goto errout;
2535 }
2536
2537 if (prio == 0) {
2538 tfilter_notify_chain(net, skb, block, q, parent, n,
2539 chain, RTM_DELTFILTER, extack);
2540 tcf_chain_flush(chain, rtnl_held);
2541 err = 0;
2542 goto errout;
2543 }
2544
2545 mutex_lock(&chain->filter_chain_lock);
2546 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2547 prio, false, extack);
2548 if (!tp) {
2549 err = -ENOENT;
2550 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2551 goto errout_locked;
2552 } else if (IS_ERR(tp)) {
2553 err = PTR_ERR(tp);
2554 goto errout_locked;
2555 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2556 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2557 err = -EINVAL;
2558 goto errout_locked;
2559 } else if (t->tcm_handle == 0) {
2560 tcf_proto_signal_destroying(chain, tp);
2561 tcf_chain_tp_remove(chain, &chain_info, tp);
2562 mutex_unlock(&chain->filter_chain_lock);
2563
2564 tcf_proto_put(tp, rtnl_held, NULL);
2565 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2566 RTM_DELTFILTER, false, rtnl_held, extack);
2567 err = 0;
2568 goto errout;
2569 }
2570 mutex_unlock(&chain->filter_chain_lock);
2571
2572 fh = tp->ops->get(tp, t->tcm_handle);
2573
2574 if (!fh) {
2575 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2576 err = -ENOENT;
2577 } else {
2578 bool last;
2579
2580 err = tfilter_del_notify(net, skb, n, tp, block, q, parent, fh,
2581 &last, rtnl_held, extack);
2582
2583 if (err)
2584 goto errout;
2585 if (last)
2586 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2587 }
2588
2589 errout:
2590 if (chain) {
2591 if (tp && !IS_ERR(tp))
2592 tcf_proto_put(tp, rtnl_held, NULL);
2593 tcf_chain_put(chain);
2594 }
2595 tcf_block_release(q, block, rtnl_held);
2596
2597 if (rtnl_held)
2598 rtnl_unlock();
2599
2600 return err;
2601
2602 errout_locked:
2603 mutex_unlock(&chain->filter_chain_lock);
2604 goto errout;
2605 }
2606
2607 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2608 struct netlink_ext_ack *extack)
2609 {
2610 struct net *net = sock_net(skb->sk);
2611 struct nlattr *tca[TCA_MAX + 1];
2612 char name[IFNAMSIZ];
2613 struct tcmsg *t;
2614 u32 protocol;
2615 u32 prio;
2616 u32 parent;
2617 u32 chain_index;
2618 struct Qdisc *q = NULL;
2619 struct tcf_chain_info chain_info;
2620 struct tcf_chain *chain = NULL;
2621 struct tcf_block *block = NULL;
2622 struct tcf_proto *tp = NULL;
2623 unsigned long cl = 0;
2624 void *fh = NULL;
2625 int err;
2626 bool rtnl_held = false;
2627
2628 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2629 rtm_tca_policy, extack);
2630 if (err < 0)
2631 return err;
2632
2633 t = nlmsg_data(n);
2634 protocol = TC_H_MIN(t->tcm_info);
2635 prio = TC_H_MAJ(t->tcm_info);
2636 parent = t->tcm_parent;
2637
2638 if (prio == 0) {
2639 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2640 return -ENOENT;
2641 }
2642
2643 /* Find head of filter chain. */
2644
2645 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2646 if (err)
2647 return err;
2648
2649 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2650 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2651 err = -EINVAL;
2652 goto errout;
2653 }
2654 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2655 * unlocked, classifier type is not specified, classifier is not
2656 * unlocked.
2657 */
2658 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2659 !tcf_proto_is_unlocked(name)) {
2660 rtnl_held = true;
2661 rtnl_lock();
2662 }
2663
2664 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2665 if (err)
2666 goto errout;
2667
2668 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2669 extack);
2670 if (IS_ERR(block)) {
2671 err = PTR_ERR(block);
2672 goto errout;
2673 }
2674
2675 chain_index = nla_get_u32_default(tca[TCA_CHAIN], 0);
2676 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2677 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2678 err = -EINVAL;
2679 goto errout;
2680 }
2681 chain = tcf_chain_get(block, chain_index, false);
2682 if (!chain) {
2683 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2684 err = -EINVAL;
2685 goto errout;
2686 }
2687
2688 mutex_lock(&chain->filter_chain_lock);
2689 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2690 prio, false, extack);
2691 mutex_unlock(&chain->filter_chain_lock);
2692 if (!tp) {
2693 err = -ENOENT;
2694 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2695 goto errout;
2696 } else if (IS_ERR(tp)) {
2697 err = PTR_ERR(tp);
2698 goto errout;
2699 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2700 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2701 err = -EINVAL;
2702 goto errout;
2703 }
2704
2705 fh = tp->ops->get(tp, t->tcm_handle);
2706
2707 if (!fh) {
2708 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2709 err = -ENOENT;
2710 } else {
2711 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2712 fh, RTM_NEWTFILTER, true, rtnl_held, NULL);
2713 if (err < 0)
2714 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2715 }
2716
2717 tfilter_put(tp, fh);
2718 errout:
2719 if (chain) {
2720 if (tp && !IS_ERR(tp))
2721 tcf_proto_put(tp, rtnl_held, NULL);
2722 tcf_chain_put(chain);
2723 }
2724 tcf_block_release(q, block, rtnl_held);
2725
2726 if (rtnl_held)
2727 rtnl_unlock();
2728
2729 return err;
2730 }
2731
2732 struct tcf_dump_args {
2733 struct tcf_walker w;
2734 struct sk_buff *skb;
2735 struct netlink_callback *cb;
2736 struct tcf_block *block;
2737 struct Qdisc *q;
2738 u32 parent;
2739 bool terse_dump;
2740 };
2741
2742 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2743 {
2744 struct tcf_dump_args *a = (void *)arg;
2745 struct net *net = sock_net(a->skb->sk);
2746
2747 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2748 n, NETLINK_CB(a->cb->skb).portid,
2749 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2750 RTM_NEWTFILTER, a->terse_dump, true, NULL);
2751 }
2752
2753 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2754 struct sk_buff *skb, struct netlink_callback *cb,
2755 long index_start, long *p_index, bool terse)
2756 {
2757 struct net *net = sock_net(skb->sk);
2758 struct tcf_block *block = chain->block;
2759 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2760 struct tcf_proto *tp, *tp_prev;
2761 struct tcf_dump_args arg;
2762
2763 for (tp = __tcf_get_next_proto(chain, NULL);
2764 tp;
2765 tp_prev = tp,
2766 tp = __tcf_get_next_proto(chain, tp),
2767 tcf_proto_put(tp_prev, true, NULL),
2768 (*p_index)++) {
2769 if (*p_index < index_start)
2770 continue;
2771 if (TC_H_MAJ(tcm->tcm_info) &&
2772 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2773 continue;
2774 if (TC_H_MIN(tcm->tcm_info) &&
2775 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2776 continue;
2777 if (*p_index > index_start)
2778 memset(&cb->args[1], 0,
2779 sizeof(cb->args) - sizeof(cb->args[0]));
2780 if (cb->args[1] == 0) {
2781 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2782 NETLINK_CB(cb->skb).portid,
2783 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2784 RTM_NEWTFILTER, false, true, NULL) <= 0)
2785 goto errout;
2786 cb->args[1] = 1;
2787 }
2788 if (!tp->ops->walk)
2789 continue;
2790 arg.w.fn = tcf_node_dump;
2791 arg.skb = skb;
2792 arg.cb = cb;
2793 arg.block = block;
2794 arg.q = q;
2795 arg.parent = parent;
2796 arg.w.stop = 0;
2797 arg.w.skip = cb->args[1] - 1;
2798 arg.w.count = 0;
2799 arg.w.cookie = cb->args[2];
2800 arg.terse_dump = terse;
2801 tp->ops->walk(tp, &arg.w, true);
2802 cb->args[2] = arg.w.cookie;
2803 cb->args[1] = arg.w.count + 1;
2804 if (arg.w.stop)
2805 goto errout;
2806 }
2807 return true;
2808
2809 errout:
2810 tcf_proto_put(tp, true, NULL);
2811 return false;
2812 }
2813
2814 static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
2815 [TCA_CHAIN] = { .type = NLA_U32 },
2816 [TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
2817 };
2818
2819 /* called with RTNL */
2820 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2821 {
2822 struct tcf_chain *chain, *chain_prev;
2823 struct net *net = sock_net(skb->sk);
2824 struct nlattr *tca[TCA_MAX + 1];
2825 struct Qdisc *q = NULL;
2826 struct tcf_block *block;
2827 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2828 bool terse_dump = false;
2829 long index_start;
2830 long index;
2831 u32 parent;
2832 int err;
2833
2834 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2835 return skb->len;
2836
2837 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2838 tcf_tfilter_dump_policy, cb->extack);
2839 if (err)
2840 return err;
2841
2842 if (tca[TCA_DUMP_FLAGS]) {
2843 struct nla_bitfield32 flags =
2844 nla_get_bitfield32(tca[TCA_DUMP_FLAGS]);
2845
2846 terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE;
2847 }
2848
2849 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2850 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2851 if (!block)
2852 goto out;
2853 /* If we work with block index, q is NULL and parent value
2854 * will never be used in the following code. The check
2855 * in tcf_fill_node prevents it. However, compiler does not
2856 * see that far, so set parent to zero to silence the warning
2857 * about parent being uninitialized.
2858 */
2859 parent = 0;
2860 } else {
2861 const struct Qdisc_class_ops *cops;
2862 struct net_device *dev;
2863 unsigned long cl = 0;
2864
2865 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2866 if (!dev)
2867 return skb->len;
2868
2869 parent = tcm->tcm_parent;
2870 if (!parent)
2871 q = rtnl_dereference(dev->qdisc);
2872 else
2873 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2874 if (!q)
2875 goto out;
2876 cops = q->ops->cl_ops;
2877 if (!cops)
2878 goto out;
2879 if (!cops->tcf_block)
2880 goto out;
2881 if (TC_H_MIN(tcm->tcm_parent)) {
2882 cl = cops->find(q, tcm->tcm_parent);
2883 if (cl == 0)
2884 goto out;
2885 }
2886 block = cops->tcf_block(q, cl, NULL);
2887 if (!block)
2888 goto out;
2889 parent = block->classid;
2890 if (tcf_block_shared(block))
2891 q = NULL;
2892 }
2893
2894 index_start = cb->args[0];
2895 index = 0;
2896
2897 for (chain = __tcf_get_next_chain(block, NULL);
2898 chain;
2899 chain_prev = chain,
2900 chain = __tcf_get_next_chain(block, chain),
2901 tcf_chain_put(chain_prev)) {
2902 if (tca[TCA_CHAIN] &&
2903 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2904 continue;
2905 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2906 index_start, &index, terse_dump)) {
2907 tcf_chain_put(chain);
2908 err = -EMSGSIZE;
2909 break;
2910 }
2911 }
2912
2913 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2914 tcf_block_refcnt_put(block, true);
2915 cb->args[0] = index;
2916
2917 out:
2918 /* If we did no progress, the error (EMSGSIZE) is real */
2919 if (skb->len == 0 && err)
2920 return err;
2921 return skb->len;
2922 }
2923
2924 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2925 void *tmplt_priv, u32 chain_index,
2926 struct net *net, struct sk_buff *skb,
2927 struct tcf_block *block,
2928 u32 portid, u32 seq, u16 flags, int event,
2929 struct netlink_ext_ack *extack)
2930 {
2931 unsigned char *b = skb_tail_pointer(skb);
2932 const struct tcf_proto_ops *ops;
2933 struct nlmsghdr *nlh;
2934 struct tcmsg *tcm;
2935 void *priv;
2936
2937 ops = tmplt_ops;
2938 priv = tmplt_priv;
2939
2940 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2941 if (!nlh)
2942 goto out_nlmsg_trim;
2943 tcm = nlmsg_data(nlh);
2944 tcm->tcm_family = AF_UNSPEC;
2945 tcm->tcm__pad1 = 0;
2946 tcm->tcm__pad2 = 0;
2947 tcm->tcm_handle = 0;
2948 if (block->q) {
2949 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2950 tcm->tcm_parent = block->q->handle;
2951 } else {
2952 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2953 tcm->tcm_block_index = block->index;
2954 }
2955
2956 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2957 goto nla_put_failure;
2958
2959 if (ops) {
2960 if (nla_put_string(skb, TCA_KIND, ops->kind))
2961 goto nla_put_failure;
2962 if (ops->tmplt_dump(skb, net, priv) < 0)
2963 goto nla_put_failure;
2964 }
2965
2966 if (extack && extack->_msg &&
2967 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
2968 goto out_nlmsg_trim;
2969
2970 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2971
2972 return skb->len;
2973
2974 out_nlmsg_trim:
2975 nla_put_failure:
2976 nlmsg_trim(skb, b);
2977 return -EMSGSIZE;
2978 }
2979
2980 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2981 u32 seq, u16 flags, int event, bool unicast,
2982 struct netlink_ext_ack *extack)
2983 {
2984 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2985 struct tcf_block *block = chain->block;
2986 struct net *net = block->net;
2987 struct sk_buff *skb;
2988 int err = 0;
2989
2990 if (!unicast && !rtnl_notify_needed(net, flags, RTNLGRP_TC))
2991 return 0;
2992
2993 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2994 if (!skb)
2995 return -ENOBUFS;
2996
2997 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2998 chain->index, net, skb, block, portid,
2999 seq, flags, event, extack) <= 0) {
3000 kfree_skb(skb);
3001 return -EINVAL;
3002 }
3003
3004 if (unicast)
3005 err = rtnl_unicast(skb, net, portid);
3006 else
3007 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
3008 flags & NLM_F_ECHO);
3009
3010 return err;
3011 }
3012
3013 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
3014 void *tmplt_priv, u32 chain_index,
3015 struct tcf_block *block, struct sk_buff *oskb,
3016 u32 seq, u16 flags)
3017 {
3018 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
3019 struct net *net = block->net;
3020 struct sk_buff *skb;
3021
3022 if (!rtnl_notify_needed(net, flags, RTNLGRP_TC))
3023 return 0;
3024
3025 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3026 if (!skb)
3027 return -ENOBUFS;
3028
3029 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
3030 block, portid, seq, flags, RTM_DELCHAIN, NULL) <= 0) {
3031 kfree_skb(skb);
3032 return -EINVAL;
3033 }
3034
3035 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
3036 }
3037
3038 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
3039 struct nlattr **tca,
3040 struct netlink_ext_ack *extack)
3041 {
3042 const struct tcf_proto_ops *ops;
3043 char name[IFNAMSIZ];
3044 void *tmplt_priv;
3045
3046 /* If kind is not set, user did not specify template. */
3047 if (!tca[TCA_KIND])
3048 return 0;
3049
3050 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
3051 NL_SET_ERR_MSG(extack, "Specified TC chain template name too long");
3052 return -EINVAL;
3053 }
3054
3055 ops = tcf_proto_lookup_ops(name, true, extack);
3056 if (IS_ERR(ops))
3057 return PTR_ERR(ops);
3058 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump ||
3059 !ops->tmplt_reoffload) {
3060 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
3061 module_put(ops->owner);
3062 return -EOPNOTSUPP;
3063 }
3064
3065 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
3066 if (IS_ERR(tmplt_priv)) {
3067 module_put(ops->owner);
3068 return PTR_ERR(tmplt_priv);
3069 }
3070 chain->tmplt_ops = ops;
3071 chain->tmplt_priv = tmplt_priv;
3072 return 0;
3073 }
3074
3075 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
3076 void *tmplt_priv)
3077 {
3078 /* If template ops are set, no work to do for us. */
3079 if (!tmplt_ops)
3080 return;
3081
3082 tmplt_ops->tmplt_destroy(tmplt_priv);
3083 module_put(tmplt_ops->owner);
3084 }
3085
3086 /* Add/delete/get a chain */
3087
3088 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
3089 struct netlink_ext_ack *extack)
3090 {
3091 struct net *net = sock_net(skb->sk);
3092 struct nlattr *tca[TCA_MAX + 1];
3093 struct tcmsg *t;
3094 u32 parent;
3095 u32 chain_index;
3096 struct Qdisc *q;
3097 struct tcf_chain *chain;
3098 struct tcf_block *block;
3099 unsigned long cl;
3100 int err;
3101
3102 replay:
3103 q = NULL;
3104 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
3105 rtm_tca_policy, extack);
3106 if (err < 0)
3107 return err;
3108
3109 t = nlmsg_data(n);
3110 parent = t->tcm_parent;
3111 cl = 0;
3112
3113 block = tcf_block_find(net, &q, &parent, &cl,
3114 t->tcm_ifindex, t->tcm_block_index, extack);
3115 if (IS_ERR(block))
3116 return PTR_ERR(block);
3117
3118 chain_index = nla_get_u32_default(tca[TCA_CHAIN], 0);
3119 if (chain_index > TC_ACT_EXT_VAL_MASK) {
3120 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
3121 err = -EINVAL;
3122 goto errout_block;
3123 }
3124
3125 mutex_lock(&block->lock);
3126 chain = tcf_chain_lookup(block, chain_index);
3127 if (n->nlmsg_type == RTM_NEWCHAIN) {
3128 if (chain) {
3129 if (tcf_chain_held_by_acts_only(chain)) {
3130 /* The chain exists only because there is
3131 * some action referencing it.
3132 */
3133 tcf_chain_hold(chain);
3134 } else {
3135 NL_SET_ERR_MSG(extack, "Filter chain already exists");
3136 err = -EEXIST;
3137 goto errout_block_locked;
3138 }
3139 } else {
3140 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
3141 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
3142 err = -ENOENT;
3143 goto errout_block_locked;
3144 }
3145 chain = tcf_chain_create(block, chain_index);
3146 if (!chain) {
3147 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
3148 err = -ENOMEM;
3149 goto errout_block_locked;
3150 }
3151 }
3152 } else {
3153 if (!chain || tcf_chain_held_by_acts_only(chain)) {
3154 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
3155 err = -EINVAL;
3156 goto errout_block_locked;
3157 }
3158 tcf_chain_hold(chain);
3159 }
3160
3161 if (n->nlmsg_type == RTM_NEWCHAIN) {
3162 /* Modifying chain requires holding parent block lock. In case
3163 * the chain was successfully added, take a reference to the
3164 * chain. This ensures that an empty chain does not disappear at
3165 * the end of this function.
3166 */
3167 tcf_chain_hold(chain);
3168 chain->explicitly_created = true;
3169 }
3170 mutex_unlock(&block->lock);
3171
3172 switch (n->nlmsg_type) {
3173 case RTM_NEWCHAIN:
3174 err = tc_chain_tmplt_add(chain, net, tca, extack);
3175 if (err) {
3176 tcf_chain_put_explicitly_created(chain);
3177 goto errout;
3178 }
3179
3180 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
3181 RTM_NEWCHAIN, false, extack);
3182 break;
3183 case RTM_DELCHAIN:
3184 tfilter_notify_chain(net, skb, block, q, parent, n,
3185 chain, RTM_DELTFILTER, extack);
3186 /* Flush the chain first as the user requested chain removal. */
3187 tcf_chain_flush(chain, true);
3188 /* In case the chain was successfully deleted, put a reference
3189 * to the chain previously taken during addition.
3190 */
3191 tcf_chain_put_explicitly_created(chain);
3192 break;
3193 case RTM_GETCHAIN:
3194 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
3195 n->nlmsg_flags, n->nlmsg_type, true, extack);
3196 if (err < 0)
3197 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
3198 break;
3199 default:
3200 err = -EOPNOTSUPP;
3201 NL_SET_ERR_MSG(extack, "Unsupported message type");
3202 goto errout;
3203 }
3204
3205 errout:
3206 tcf_chain_put(chain);
3207 errout_block:
3208 tcf_block_release(q, block, true);
3209 if (err == -EAGAIN)
3210 /* Replay the request. */
3211 goto replay;
3212 return err;
3213
3214 errout_block_locked:
3215 mutex_unlock(&block->lock);
3216 goto errout_block;
3217 }
3218
3219 /* called with RTNL */
3220 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
3221 {
3222 struct net *net = sock_net(skb->sk);
3223 struct nlattr *tca[TCA_MAX + 1];
3224 struct Qdisc *q = NULL;
3225 struct tcf_block *block;
3226 struct tcmsg *tcm = nlmsg_data(cb->nlh);
3227 struct tcf_chain *chain;
3228 long index_start;
3229 long index;
3230 int err;
3231
3232 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
3233 return skb->len;
3234
3235 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
3236 rtm_tca_policy, cb->extack);
3237 if (err)
3238 return err;
3239
3240 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
3241 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
3242 if (!block)
3243 goto out;
3244 } else {
3245 const struct Qdisc_class_ops *cops;
3246 struct net_device *dev;
3247 unsigned long cl = 0;
3248
3249 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
3250 if (!dev)
3251 return skb->len;
3252
3253 if (!tcm->tcm_parent)
3254 q = rtnl_dereference(dev->qdisc);
3255 else
3256 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
3257
3258 if (!q)
3259 goto out;
3260 cops = q->ops->cl_ops;
3261 if (!cops)
3262 goto out;
3263 if (!cops->tcf_block)
3264 goto out;
3265 if (TC_H_MIN(tcm->tcm_parent)) {
3266 cl = cops->find(q, tcm->tcm_parent);
3267 if (cl == 0)
3268 goto out;
3269 }
3270 block = cops->tcf_block(q, cl, NULL);
3271 if (!block)
3272 goto out;
3273 if (tcf_block_shared(block))
3274 q = NULL;
3275 }
3276
3277 index_start = cb->args[0];
3278 index = 0;
3279
3280 mutex_lock(&block->lock);
3281 list_for_each_entry(chain, &block->chain_list, list) {
3282 if ((tca[TCA_CHAIN] &&
3283 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
3284 continue;
3285 if (index < index_start) {
3286 index++;
3287 continue;
3288 }
3289 if (tcf_chain_held_by_acts_only(chain))
3290 continue;
3291 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3292 chain->index, net, skb, block,
3293 NETLINK_CB(cb->skb).portid,
3294 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3295 RTM_NEWCHAIN, NULL);
3296 if (err <= 0)
3297 break;
3298 index++;
3299 }
3300 mutex_unlock(&block->lock);
3301
3302 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3303 tcf_block_refcnt_put(block, true);
3304 cb->args[0] = index;
3305
3306 out:
3307 /* If we did no progress, the error (EMSGSIZE) is real */
3308 if (skb->len == 0 && err)
3309 return err;
3310 return skb->len;
3311 }
3312
3313 int tcf_exts_init_ex(struct tcf_exts *exts, struct net *net, int action,
3314 int police, struct tcf_proto *tp, u32 handle,
3315 bool use_action_miss)
3316 {
3317 int err = 0;
3318
3319 #ifdef CONFIG_NET_CLS_ACT
3320 exts->type = 0;
3321 exts->nr_actions = 0;
3322 exts->miss_cookie_node = NULL;
3323 /* Note: we do not own yet a reference on net.
3324 * This reference might be taken later from tcf_exts_get_net().
3325 */
3326 exts->net = net;
3327 exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
3328 GFP_KERNEL);
3329 if (!exts->actions)
3330 return -ENOMEM;
3331 #endif
3332
3333 exts->action = action;
3334 exts->police = police;
3335
3336 if (!use_action_miss)
3337 return 0;
3338
3339 err = tcf_exts_miss_cookie_base_alloc(exts, tp, handle);
3340 if (err)
3341 goto err_miss_alloc;
3342
3343 return 0;
3344
3345 err_miss_alloc:
3346 tcf_exts_destroy(exts);
3347 #ifdef CONFIG_NET_CLS_ACT
3348 exts->actions = NULL;
3349 #endif
3350 return err;
3351 }
3352 EXPORT_SYMBOL(tcf_exts_init_ex);
3353
3354 void tcf_exts_destroy(struct tcf_exts *exts)
3355 {
3356 tcf_exts_miss_cookie_base_destroy(exts);
3357
3358 #ifdef CONFIG_NET_CLS_ACT
3359 if (exts->actions) {
3360 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3361 kfree(exts->actions);
3362 }
3363 exts->nr_actions = 0;
3364 #endif
3365 }
3366 EXPORT_SYMBOL(tcf_exts_destroy);
3367
3368 int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3369 struct nlattr *rate_tlv, struct tcf_exts *exts,
3370 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack)
3371 {
3372 #ifdef CONFIG_NET_CLS_ACT
3373 {
3374 int init_res[TCA_ACT_MAX_PRIO] = {};
3375 struct tc_action *act;
3376 size_t attr_size = 0;
3377
3378 if (exts->police && tb[exts->police]) {
3379 struct tc_action_ops *a_o;
3380
3381 flags |= TCA_ACT_FLAGS_POLICE | TCA_ACT_FLAGS_BIND;
3382 a_o = tc_action_load_ops(tb[exts->police], flags,
3383 extack);
3384 if (IS_ERR(a_o))
3385 return PTR_ERR(a_o);
3386 act = tcf_action_init_1(net, tp, tb[exts->police],
3387 rate_tlv, a_o, init_res, flags,
3388 extack);
3389 module_put(a_o->owner);
3390 if (IS_ERR(act))
3391 return PTR_ERR(act);
3392
3393 act->type = exts->type = TCA_OLD_COMPAT;
3394 exts->actions[0] = act;
3395 exts->nr_actions = 1;
3396 tcf_idr_insert_many(exts->actions, init_res);
3397 } else if (exts->action && tb[exts->action]) {
3398 int err;
3399
3400 flags |= TCA_ACT_FLAGS_BIND;
3401 err = tcf_action_init(net, tp, tb[exts->action],
3402 rate_tlv, exts->actions, init_res,
3403 &attr_size, flags, fl_flags,
3404 extack);
3405 if (err < 0)
3406 return err;
3407 exts->nr_actions = err;
3408 }
3409 }
3410 #else
3411 if ((exts->action && tb[exts->action]) ||
3412 (exts->police && tb[exts->police])) {
3413 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3414 return -EOPNOTSUPP;
3415 }
3416 #endif
3417
3418 return 0;
3419 }
3420 EXPORT_SYMBOL(tcf_exts_validate_ex);
3421
3422 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3423 struct nlattr *rate_tlv, struct tcf_exts *exts,
3424 u32 flags, struct netlink_ext_ack *extack)
3425 {
3426 return tcf_exts_validate_ex(net, tp, tb, rate_tlv, exts,
3427 flags, 0, extack);
3428 }
3429 EXPORT_SYMBOL(tcf_exts_validate);
3430
3431 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3432 {
3433 #ifdef CONFIG_NET_CLS_ACT
3434 struct tcf_exts old = *dst;
3435
3436 *dst = *src;
3437 tcf_exts_destroy(&old);
3438 #endif
3439 }
3440 EXPORT_SYMBOL(tcf_exts_change);
3441
3442 #ifdef CONFIG_NET_CLS_ACT
3443 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3444 {
3445 if (exts->nr_actions == 0)
3446 return NULL;
3447 else
3448 return exts->actions[0];
3449 }
3450 #endif
3451
3452 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3453 {
3454 #ifdef CONFIG_NET_CLS_ACT
3455 struct nlattr *nest;
3456
3457 if (exts->action && tcf_exts_has_actions(exts)) {
3458 /*
3459 * again for backward compatible mode - we want
3460 * to work with both old and new modes of entering
3461 * tc data even if iproute2 was newer - jhs
3462 */
3463 if (exts->type != TCA_OLD_COMPAT) {
3464 nest = nla_nest_start_noflag(skb, exts->action);
3465 if (nest == NULL)
3466 goto nla_put_failure;
3467
3468 if (tcf_action_dump(skb, exts->actions, 0, 0, false)
3469 < 0)
3470 goto nla_put_failure;
3471 nla_nest_end(skb, nest);
3472 } else if (exts->police) {
3473 struct tc_action *act = tcf_exts_first_act(exts);
3474 nest = nla_nest_start_noflag(skb, exts->police);
3475 if (nest == NULL || !act)
3476 goto nla_put_failure;
3477 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3478 goto nla_put_failure;
3479 nla_nest_end(skb, nest);
3480 }
3481 }
3482 return 0;
3483
3484 nla_put_failure:
3485 nla_nest_cancel(skb, nest);
3486 return -1;
3487 #else
3488 return 0;
3489 #endif
3490 }
3491 EXPORT_SYMBOL(tcf_exts_dump);
3492
3493 int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts)
3494 {
3495 #ifdef CONFIG_NET_CLS_ACT
3496 struct nlattr *nest;
3497
3498 if (!exts->action || !tcf_exts_has_actions(exts))
3499 return 0;
3500
3501 nest = nla_nest_start_noflag(skb, exts->action);
3502 if (!nest)
3503 goto nla_put_failure;
3504
3505 if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0)
3506 goto nla_put_failure;
3507 nla_nest_end(skb, nest);
3508 return 0;
3509
3510 nla_put_failure:
3511 nla_nest_cancel(skb, nest);
3512 return -1;
3513 #else
3514 return 0;
3515 #endif
3516 }
3517 EXPORT_SYMBOL(tcf_exts_terse_dump);
3518
3519 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3520 {
3521 #ifdef CONFIG_NET_CLS_ACT
3522 struct tc_action *a = tcf_exts_first_act(exts);
3523 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3524 return -1;
3525 #endif
3526 return 0;
3527 }
3528 EXPORT_SYMBOL(tcf_exts_dump_stats);
3529
3530 static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
3531 {
3532 if (*flags & TCA_CLS_FLAGS_IN_HW)
3533 return;
3534 *flags |= TCA_CLS_FLAGS_IN_HW;
3535 if (tc_skip_sw(*flags))
3536 atomic_inc(&block->skipswcnt);
3537 atomic_inc(&block->offloadcnt);
3538 }
3539
3540 static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
3541 {
3542 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
3543 return;
3544 *flags &= ~TCA_CLS_FLAGS_IN_HW;
3545 if (tc_skip_sw(*flags))
3546 atomic_dec(&block->skipswcnt);
3547 atomic_dec(&block->offloadcnt);
3548 }
3549
3550 static void tc_cls_offload_cnt_update(struct tcf_block *block,
3551 struct tcf_proto *tp, u32 *cnt,
3552 u32 *flags, u32 diff, bool add)
3553 {
3554 lockdep_assert_held(&block->cb_lock);
3555
3556 spin_lock(&tp->lock);
3557 if (add) {
3558 if (!*cnt)
3559 tcf_block_offload_inc(block, flags);
3560 *cnt += diff;
3561 } else {
3562 *cnt -= diff;
3563 if (!*cnt)
3564 tcf_block_offload_dec(block, flags);
3565 }
3566 spin_unlock(&tp->lock);
3567 }
3568
3569 static void
3570 tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
3571 u32 *cnt, u32 *flags)
3572 {
3573 lockdep_assert_held(&block->cb_lock);
3574
3575 spin_lock(&tp->lock);
3576 tcf_block_offload_dec(block, flags);
3577 *cnt = 0;
3578 spin_unlock(&tp->lock);
3579 }
3580
3581 static int
3582 __tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3583 void *type_data, bool err_stop)
3584 {
3585 struct flow_block_cb *block_cb;
3586 int ok_count = 0;
3587 int err;
3588
3589 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
3590 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3591 if (err) {
3592 if (err_stop)
3593 return err;
3594 } else {
3595 ok_count++;
3596 }
3597 }
3598 return ok_count;
3599 }
3600
3601 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3602 void *type_data, bool err_stop, bool rtnl_held)
3603 {
3604 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3605 int ok_count;
3606
3607 retry:
3608 if (take_rtnl)
3609 rtnl_lock();
3610 down_read(&block->cb_lock);
3611 /* Need to obtain rtnl lock if block is bound to devs that require it.
3612 * In block bind code cb_lock is obtained while holding rtnl, so we must
3613 * obtain the locks in same order here.
3614 */
3615 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3616 up_read(&block->cb_lock);
3617 take_rtnl = true;
3618 goto retry;
3619 }
3620
3621 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3622
3623 up_read(&block->cb_lock);
3624 if (take_rtnl)
3625 rtnl_unlock();
3626 return ok_count;
3627 }
3628 EXPORT_SYMBOL(tc_setup_cb_call);
3629
3630 /* Non-destructive filter add. If filter that wasn't already in hardware is
3631 * successfully offloaded, increment block offloads counter. On failure,
3632 * previously offloaded filter is considered to be intact and offloads counter
3633 * is not decremented.
3634 */
3635
3636 int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
3637 enum tc_setup_type type, void *type_data, bool err_stop,
3638 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3639 {
3640 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3641 int ok_count;
3642
3643 retry:
3644 if (take_rtnl)
3645 rtnl_lock();
3646 down_read(&block->cb_lock);
3647 /* Need to obtain rtnl lock if block is bound to devs that require it.
3648 * In block bind code cb_lock is obtained while holding rtnl, so we must
3649 * obtain the locks in same order here.
3650 */
3651 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3652 up_read(&block->cb_lock);
3653 take_rtnl = true;
3654 goto retry;
3655 }
3656
3657 /* Make sure all netdevs sharing this block are offload-capable. */
3658 if (block->nooffloaddevcnt && err_stop) {
3659 ok_count = -EOPNOTSUPP;
3660 goto err_unlock;
3661 }
3662
3663 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3664 if (ok_count < 0)
3665 goto err_unlock;
3666
3667 if (tp->ops->hw_add)
3668 tp->ops->hw_add(tp, type_data);
3669 if (ok_count > 0)
3670 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
3671 ok_count, true);
3672 err_unlock:
3673 up_read(&block->cb_lock);
3674 if (take_rtnl)
3675 rtnl_unlock();
3676 return min(ok_count, 0);
3677 }
3678 EXPORT_SYMBOL(tc_setup_cb_add);
3679
3680 /* Destructive filter replace. If filter that wasn't already in hardware is
3681 * successfully offloaded, increment block offload counter. On failure,
3682 * previously offloaded filter is considered to be destroyed and offload counter
3683 * is decremented.
3684 */
3685
3686 int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
3687 enum tc_setup_type type, void *type_data, bool err_stop,
3688 u32 *old_flags, unsigned int *old_in_hw_count,
3689 u32 *new_flags, unsigned int *new_in_hw_count,
3690 bool rtnl_held)
3691 {
3692 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3693 int ok_count;
3694
3695 retry:
3696 if (take_rtnl)
3697 rtnl_lock();
3698 down_read(&block->cb_lock);
3699 /* Need to obtain rtnl lock if block is bound to devs that require it.
3700 * In block bind code cb_lock is obtained while holding rtnl, so we must
3701 * obtain the locks in same order here.
3702 */
3703 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3704 up_read(&block->cb_lock);
3705 take_rtnl = true;
3706 goto retry;
3707 }
3708
3709 /* Make sure all netdevs sharing this block are offload-capable. */
3710 if (block->nooffloaddevcnt && err_stop) {
3711 ok_count = -EOPNOTSUPP;
3712 goto err_unlock;
3713 }
3714
3715 tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
3716 if (tp->ops->hw_del)
3717 tp->ops->hw_del(tp, type_data);
3718
3719 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3720 if (ok_count < 0)
3721 goto err_unlock;
3722
3723 if (tp->ops->hw_add)
3724 tp->ops->hw_add(tp, type_data);
3725 if (ok_count > 0)
3726 tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
3727 new_flags, ok_count, true);
3728 err_unlock:
3729 up_read(&block->cb_lock);
3730 if (take_rtnl)
3731 rtnl_unlock();
3732 return min(ok_count, 0);
3733 }
3734 EXPORT_SYMBOL(tc_setup_cb_replace);
3735
3736 /* Destroy filter and decrement block offload counter, if filter was previously
3737 * offloaded.
3738 */
3739
3740 int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
3741 enum tc_setup_type type, void *type_data, bool err_stop,
3742 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3743 {
3744 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3745 int ok_count;
3746
3747 retry:
3748 if (take_rtnl)
3749 rtnl_lock();
3750 down_read(&block->cb_lock);
3751 /* Need to obtain rtnl lock if block is bound to devs that require it.
3752 * In block bind code cb_lock is obtained while holding rtnl, so we must
3753 * obtain the locks in same order here.
3754 */
3755 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3756 up_read(&block->cb_lock);
3757 take_rtnl = true;
3758 goto retry;
3759 }
3760
3761 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3762
3763 tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
3764 if (tp->ops->hw_del)
3765 tp->ops->hw_del(tp, type_data);
3766
3767 up_read(&block->cb_lock);
3768 if (take_rtnl)
3769 rtnl_unlock();
3770 return min(ok_count, 0);
3771 }
3772 EXPORT_SYMBOL(tc_setup_cb_destroy);
3773
3774 int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
3775 bool add, flow_setup_cb_t *cb,
3776 enum tc_setup_type type, void *type_data,
3777 void *cb_priv, u32 *flags, unsigned int *in_hw_count)
3778 {
3779 int err = cb(type, type_data, cb_priv);
3780
3781 if (err) {
3782 if (add && tc_skip_sw(*flags))
3783 return err;
3784 } else {
3785 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
3786 add);
3787 }
3788
3789 return 0;
3790 }
3791 EXPORT_SYMBOL(tc_setup_cb_reoffload);
3792
3793 static int tcf_act_get_user_cookie(struct flow_action_entry *entry,
3794 const struct tc_action *act)
3795 {
3796 struct tc_cookie *user_cookie;
3797 int err = 0;
3798
3799 rcu_read_lock();
3800 user_cookie = rcu_dereference(act->user_cookie);
3801 if (user_cookie) {
3802 entry->user_cookie = flow_action_cookie_create(user_cookie->data,
3803 user_cookie->len,
3804 GFP_ATOMIC);
3805 if (!entry->user_cookie)
3806 err = -ENOMEM;
3807 }
3808 rcu_read_unlock();
3809 return err;
3810 }
3811
3812 static void tcf_act_put_user_cookie(struct flow_action_entry *entry)
3813 {
3814 flow_action_cookie_destroy(entry->user_cookie);
3815 }
3816
3817 void tc_cleanup_offload_action(struct flow_action *flow_action)
3818 {
3819 struct flow_action_entry *entry;
3820 int i;
3821
3822 flow_action_for_each(i, entry, flow_action) {
3823 tcf_act_put_user_cookie(entry);
3824 if (entry->destructor)
3825 entry->destructor(entry->destructor_priv);
3826 }
3827 }
3828 EXPORT_SYMBOL(tc_cleanup_offload_action);
3829
3830 static int tc_setup_offload_act(struct tc_action *act,
3831 struct flow_action_entry *entry,
3832 u32 *index_inc,
3833 struct netlink_ext_ack *extack)
3834 {
3835 #ifdef CONFIG_NET_CLS_ACT
3836 if (act->ops->offload_act_setup) {
3837 return act->ops->offload_act_setup(act, entry, index_inc, true,
3838 extack);
3839 } else {
3840 NL_SET_ERR_MSG(extack, "Action does not support offload");
3841 return -EOPNOTSUPP;
3842 }
3843 #else
3844 return 0;
3845 #endif
3846 }
3847
3848 int tc_setup_action(struct flow_action *flow_action,
3849 struct tc_action *actions[],
3850 u32 miss_cookie_base,
3851 struct netlink_ext_ack *extack)
3852 {
3853 int i, j, k, index, err = 0;
3854 struct tc_action *act;
3855
3856 BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY);
3857 BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
3858 BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
3859
3860 if (!actions)
3861 return 0;
3862
3863 j = 0;
3864 tcf_act_for_each_action(i, act, actions) {
3865 struct flow_action_entry *entry;
3866
3867 entry = &flow_action->entries[j];
3868 spin_lock_bh(&act->tcfa_lock);
3869 err = tcf_act_get_user_cookie(entry, act);
3870 if (err)
3871 goto err_out_locked;
3872
3873 index = 0;
3874 err = tc_setup_offload_act(act, entry, &index, extack);
3875 if (err)
3876 goto err_out_locked;
3877
3878 for (k = 0; k < index ; k++) {
3879 entry[k].hw_stats = tc_act_hw_stats(act->hw_stats);
3880 entry[k].hw_index = act->tcfa_index;
3881 entry[k].cookie = (unsigned long)act;
3882 entry[k].miss_cookie =
3883 tcf_exts_miss_cookie_get(miss_cookie_base, i);
3884 }
3885
3886 j += index;
3887
3888 spin_unlock_bh(&act->tcfa_lock);
3889 }
3890
3891 err_out:
3892 if (err)
3893 tc_cleanup_offload_action(flow_action);
3894
3895 return err;
3896 err_out_locked:
3897 spin_unlock_bh(&act->tcfa_lock);
3898 goto err_out;
3899 }
3900
3901 int tc_setup_offload_action(struct flow_action *flow_action,
3902 const struct tcf_exts *exts,
3903 struct netlink_ext_ack *extack)
3904 {
3905 #ifdef CONFIG_NET_CLS_ACT
3906 u32 miss_cookie_base;
3907
3908 if (!exts)
3909 return 0;
3910
3911 miss_cookie_base = exts->miss_cookie_node ?
3912 exts->miss_cookie_node->miss_cookie_base : 0;
3913 return tc_setup_action(flow_action, exts->actions, miss_cookie_base,
3914 extack);
3915 #else
3916 return 0;
3917 #endif
3918 }
3919 EXPORT_SYMBOL(tc_setup_offload_action);
3920
3921 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3922 {
3923 unsigned int num_acts = 0;
3924 struct tc_action *act;
3925 int i;
3926
3927 tcf_exts_for_each_action(i, act, exts) {
3928 if (is_tcf_pedit(act))
3929 num_acts += tcf_pedit_nkeys(act);
3930 else
3931 num_acts++;
3932 }
3933 return num_acts;
3934 }
3935 EXPORT_SYMBOL(tcf_exts_num_actions);
3936
3937 #ifdef CONFIG_NET_CLS_ACT
3938 static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
3939 u32 *p_block_index,
3940 struct netlink_ext_ack *extack)
3941 {
3942 *p_block_index = nla_get_u32(block_index_attr);
3943 if (!*p_block_index) {
3944 NL_SET_ERR_MSG(extack, "Block number may not be zero");
3945 return -EINVAL;
3946 }
3947
3948 return 0;
3949 }
3950
3951 int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
3952 enum flow_block_binder_type binder_type,
3953 struct nlattr *block_index_attr,
3954 struct netlink_ext_ack *extack)
3955 {
3956 u32 block_index;
3957 int err;
3958
3959 if (!block_index_attr)
3960 return 0;
3961
3962 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3963 if (err)
3964 return err;
3965
3966 qe->info.binder_type = binder_type;
3967 qe->info.chain_head_change = tcf_chain_head_change_dflt;
3968 qe->info.chain_head_change_priv = &qe->filter_chain;
3969 qe->info.block_index = block_index;
3970
3971 return tcf_block_get_ext(&qe->block, sch, &qe->info, extack);
3972 }
3973 EXPORT_SYMBOL(tcf_qevent_init);
3974
3975 void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
3976 {
3977 if (qe->info.block_index)
3978 tcf_block_put_ext(qe->block, sch, &qe->info);
3979 }
3980 EXPORT_SYMBOL(tcf_qevent_destroy);
3981
3982 int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
3983 struct netlink_ext_ack *extack)
3984 {
3985 u32 block_index;
3986 int err;
3987
3988 if (!block_index_attr)
3989 return 0;
3990
3991 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3992 if (err)
3993 return err;
3994
3995 /* Bounce newly-configured block or change in block. */
3996 if (block_index != qe->info.block_index) {
3997 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
3998 return -EINVAL;
3999 }
4000
4001 return 0;
4002 }
4003 EXPORT_SYMBOL(tcf_qevent_validate_change);
4004
4005 struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
4006 struct sk_buff **to_free, int *ret)
4007 {
4008 struct tcf_result cl_res;
4009 struct tcf_proto *fl;
4010
4011 if (!qe->info.block_index)
4012 return skb;
4013
4014 fl = rcu_dereference_bh(qe->filter_chain);
4015
4016 switch (tcf_classify(skb, NULL, fl, &cl_res, false)) {
4017 case TC_ACT_SHOT:
4018 qdisc_qstats_drop(sch);
4019 __qdisc_drop(skb, to_free);
4020 *ret = __NET_XMIT_BYPASS;
4021 return NULL;
4022 case TC_ACT_STOLEN:
4023 case TC_ACT_QUEUED:
4024 case TC_ACT_TRAP:
4025 __qdisc_drop(skb, to_free);
4026 *ret = __NET_XMIT_STOLEN;
4027 return NULL;
4028 case TC_ACT_REDIRECT:
4029 skb_do_redirect(skb);
4030 *ret = __NET_XMIT_STOLEN;
4031 return NULL;
4032 }
4033
4034 return skb;
4035 }
4036 EXPORT_SYMBOL(tcf_qevent_handle);
4037
4038 int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
4039 {
4040 if (!qe->info.block_index)
4041 return 0;
4042 return nla_put_u32(skb, attr_name, qe->info.block_index);
4043 }
4044 EXPORT_SYMBOL(tcf_qevent_dump);
4045 #endif
4046
4047 static __net_init int tcf_net_init(struct net *net)
4048 {
4049 struct tcf_net *tn = net_generic(net, tcf_net_id);
4050
4051 spin_lock_init(&tn->idr_lock);
4052 idr_init(&tn->idr);
4053 return 0;
4054 }
4055
4056 static void __net_exit tcf_net_exit(struct net *net)
4057 {
4058 struct tcf_net *tn = net_generic(net, tcf_net_id);
4059
4060 idr_destroy(&tn->idr);
4061 }
4062
4063 static struct pernet_operations tcf_net_ops = {
4064 .init = tcf_net_init,
4065 .exit = tcf_net_exit,
4066 .id = &tcf_net_id,
4067 .size = sizeof(struct tcf_net),
4068 };
4069
4070 static const struct rtnl_msg_handler tc_filter_rtnl_msg_handlers[] __initconst = {
4071 {.msgtype = RTM_NEWTFILTER, .doit = tc_new_tfilter,
4072 .flags = RTNL_FLAG_DOIT_UNLOCKED},
4073 {.msgtype = RTM_DELTFILTER, .doit = tc_del_tfilter,
4074 .flags = RTNL_FLAG_DOIT_UNLOCKED},
4075 {.msgtype = RTM_GETTFILTER, .doit = tc_get_tfilter,
4076 .dumpit = tc_dump_tfilter, .flags = RTNL_FLAG_DOIT_UNLOCKED},
4077 {.msgtype = RTM_NEWCHAIN, .doit = tc_ctl_chain},
4078 {.msgtype = RTM_DELCHAIN, .doit = tc_ctl_chain},
4079 {.msgtype = RTM_GETCHAIN, .doit = tc_ctl_chain,
4080 .dumpit = tc_dump_chain},
4081 };
4082
4083 static int __init tc_filter_init(void)
4084 {
4085 int err;
4086
4087 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
4088 if (!tc_filter_wq)
4089 return -ENOMEM;
4090
4091 err = register_pernet_subsys(&tcf_net_ops);
4092 if (err)
4093 goto err_register_pernet_subsys;
4094
4095 xa_init_flags(&tcf_exts_miss_cookies_xa, XA_FLAGS_ALLOC1);
4096 rtnl_register_many(tc_filter_rtnl_msg_handlers);
4097
4098 return 0;
4099
4100 err_register_pernet_subsys:
4101 destroy_workqueue(tc_filter_wq);
4102 return err;
4103 }
4104
4105 subsys_initcall(tc_filter_init);
Kernel DRM miscellaneous fixes and cross-tree changes