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