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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/cls_api.c Packet classifier API. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
6 | * | |
7 | * Changes: | |
8 | * | |
9 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> | |
14 | #include <linux/kernel.h> | |
1da177e4 | 15 | #include <linux/string.h> |
1da177e4 | 16 | #include <linux/errno.h> |
33a48927 | 17 | #include <linux/err.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/kmod.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
48617387 | 22 | #include <linux/idr.h> |
7f76fa36 | 23 | #include <linux/rhashtable.h> |
b854272b DL |
24 | #include <net/net_namespace.h> |
25 | #include <net/sock.h> | |
dc5fc579 | 26 | #include <net/netlink.h> |
1da177e4 LT |
27 | #include <net/pkt_sched.h> |
28 | #include <net/pkt_cls.h> | |
e3ab786b | 29 | #include <net/tc_act/tc_pedit.h> |
3a7b6861 PNA |
30 | #include <net/tc_act/tc_mirred.h> |
31 | #include <net/tc_act/tc_vlan.h> | |
32 | #include <net/tc_act/tc_tunnel_key.h> | |
33 | #include <net/tc_act/tc_csum.h> | |
34 | #include <net/tc_act/tc_gact.h> | |
8c8cfc6e | 35 | #include <net/tc_act/tc_police.h> |
a7a7be60 | 36 | #include <net/tc_act/tc_sample.h> |
3a7b6861 | 37 | #include <net/tc_act/tc_skbedit.h> |
1da177e4 | 38 | |
e331473f DC |
39 | extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; |
40 | ||
1da177e4 | 41 | /* The list of all installed classifier types */ |
36272874 | 42 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
43 | |
44 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
45 | static DEFINE_RWLOCK(cls_mod_lock); | |
46 | ||
47 | /* Find classifier type by string name */ | |
48 | ||
f34e8bff | 49 | static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 50 | { |
dcd76081 | 51 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
52 | |
53 | if (kind) { | |
54 | read_lock(&cls_mod_lock); | |
36272874 | 55 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 56 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
57 | if (try_module_get(t->owner)) |
58 | res = t; | |
1da177e4 LT |
59 | break; |
60 | } | |
61 | } | |
62 | read_unlock(&cls_mod_lock); | |
63 | } | |
dcd76081 | 64 | return res; |
1da177e4 LT |
65 | } |
66 | ||
f34e8bff | 67 | static const struct tcf_proto_ops * |
12db03b6 VB |
68 | tcf_proto_lookup_ops(const char *kind, bool rtnl_held, |
69 | struct netlink_ext_ack *extack) | |
f34e8bff JP |
70 | { |
71 | const struct tcf_proto_ops *ops; | |
72 | ||
73 | ops = __tcf_proto_lookup_ops(kind); | |
74 | if (ops) | |
75 | return ops; | |
76 | #ifdef CONFIG_MODULES | |
12db03b6 VB |
77 | if (rtnl_held) |
78 | rtnl_unlock(); | |
f34e8bff | 79 | request_module("cls_%s", kind); |
12db03b6 VB |
80 | if (rtnl_held) |
81 | rtnl_lock(); | |
f34e8bff JP |
82 | ops = __tcf_proto_lookup_ops(kind); |
83 | /* We dropped the RTNL semaphore in order to perform | |
84 | * the module load. So, even if we succeeded in loading | |
85 | * the module we have to replay the request. We indicate | |
86 | * this using -EAGAIN. | |
87 | */ | |
88 | if (ops) { | |
89 | module_put(ops->owner); | |
90 | return ERR_PTR(-EAGAIN); | |
91 | } | |
92 | #endif | |
93 | NL_SET_ERR_MSG(extack, "TC classifier not found"); | |
94 | return ERR_PTR(-ENOENT); | |
95 | } | |
96 | ||
1da177e4 LT |
97 | /* Register(unregister) new classifier type */ |
98 | ||
99 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
100 | { | |
36272874 | 101 | struct tcf_proto_ops *t; |
1da177e4 LT |
102 | int rc = -EEXIST; |
103 | ||
104 | write_lock(&cls_mod_lock); | |
36272874 | 105 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
106 | if (!strcmp(ops->kind, t->kind)) |
107 | goto out; | |
108 | ||
36272874 | 109 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
110 | rc = 0; |
111 | out: | |
112 | write_unlock(&cls_mod_lock); | |
113 | return rc; | |
114 | } | |
aa767bfe | 115 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 116 | |
7aa0045d CW |
117 | static struct workqueue_struct *tc_filter_wq; |
118 | ||
1da177e4 LT |
119 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
120 | { | |
36272874 | 121 | struct tcf_proto_ops *t; |
1da177e4 LT |
122 | int rc = -ENOENT; |
123 | ||
c78e1746 DB |
124 | /* Wait for outstanding call_rcu()s, if any, from a |
125 | * tcf_proto_ops's destroy() handler. | |
126 | */ | |
127 | rcu_barrier(); | |
7aa0045d | 128 | flush_workqueue(tc_filter_wq); |
c78e1746 | 129 | |
1da177e4 | 130 | write_lock(&cls_mod_lock); |
dcd76081 ED |
131 | list_for_each_entry(t, &tcf_proto_base, head) { |
132 | if (t == ops) { | |
133 | list_del(&t->head); | |
134 | rc = 0; | |
1da177e4 | 135 | break; |
dcd76081 ED |
136 | } |
137 | } | |
1da177e4 LT |
138 | write_unlock(&cls_mod_lock); |
139 | return rc; | |
140 | } | |
aa767bfe | 141 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 142 | |
aaa908ff | 143 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 144 | { |
aaa908ff CW |
145 | INIT_RCU_WORK(rwork, func); |
146 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
147 | } |
148 | EXPORT_SYMBOL(tcf_queue_work); | |
149 | ||
1da177e4 LT |
150 | /* Select new prio value from the range, managed by kernel. */ |
151 | ||
aa767bfe | 152 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 153 | { |
aa767bfe | 154 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
155 | |
156 | if (tp) | |
cc7ec456 | 157 | first = tp->prio - 1; |
1da177e4 | 158 | |
7961973a | 159 | return TC_H_MAJ(first); |
1da177e4 LT |
160 | } |
161 | ||
470502de VB |
162 | static bool tcf_proto_is_unlocked(const char *kind) |
163 | { | |
164 | const struct tcf_proto_ops *ops; | |
165 | bool ret; | |
166 | ||
167 | ops = tcf_proto_lookup_ops(kind, false, NULL); | |
168 | /* On error return false to take rtnl lock. Proto lookup/create | |
169 | * functions will perform lookup again and properly handle errors. | |
170 | */ | |
171 | if (IS_ERR(ops)) | |
172 | return false; | |
173 | ||
174 | ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED); | |
175 | module_put(ops->owner); | |
176 | return ret; | |
177 | } | |
178 | ||
33a48927 | 179 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc | 180 | u32 prio, struct tcf_chain *chain, |
12db03b6 | 181 | bool rtnl_held, |
c35a4acc | 182 | struct netlink_ext_ack *extack) |
33a48927 JP |
183 | { |
184 | struct tcf_proto *tp; | |
185 | int err; | |
186 | ||
187 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
188 | if (!tp) | |
189 | return ERR_PTR(-ENOBUFS); | |
190 | ||
12db03b6 | 191 | tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack); |
f34e8bff JP |
192 | if (IS_ERR(tp->ops)) { |
193 | err = PTR_ERR(tp->ops); | |
d68d75fd | 194 | goto errout; |
33a48927 JP |
195 | } |
196 | tp->classify = tp->ops->classify; | |
197 | tp->protocol = protocol; | |
198 | tp->prio = prio; | |
5bc17018 | 199 | tp->chain = chain; |
8b64678e | 200 | spin_lock_init(&tp->lock); |
4dbfa766 | 201 | refcount_set(&tp->refcnt, 1); |
33a48927 JP |
202 | |
203 | err = tp->ops->init(tp); | |
204 | if (err) { | |
205 | module_put(tp->ops->owner); | |
206 | goto errout; | |
207 | } | |
208 | return tp; | |
209 | ||
210 | errout: | |
211 | kfree(tp); | |
212 | return ERR_PTR(err); | |
213 | } | |
214 | ||
4dbfa766 VB |
215 | static void tcf_proto_get(struct tcf_proto *tp) |
216 | { | |
217 | refcount_inc(&tp->refcnt); | |
218 | } | |
219 | ||
220 | static void tcf_chain_put(struct tcf_chain *chain); | |
221 | ||
12db03b6 | 222 | static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 223 | struct netlink_ext_ack *extack) |
cf1facda | 224 | { |
12db03b6 | 225 | tp->ops->destroy(tp, rtnl_held, extack); |
4dbfa766 | 226 | tcf_chain_put(tp->chain); |
763dbf63 WC |
227 | module_put(tp->ops->owner); |
228 | kfree_rcu(tp, rcu); | |
cf1facda JP |
229 | } |
230 | ||
12db03b6 | 231 | static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held, |
4dbfa766 VB |
232 | struct netlink_ext_ack *extack) |
233 | { | |
234 | if (refcount_dec_and_test(&tp->refcnt)) | |
12db03b6 | 235 | tcf_proto_destroy(tp, rtnl_held, extack); |
4dbfa766 VB |
236 | } |
237 | ||
268a351d | 238 | static int walker_check_empty(struct tcf_proto *tp, void *fh, |
6676d5e4 | 239 | struct tcf_walker *arg) |
8b64678e | 240 | { |
268a351d | 241 | if (fh) { |
6676d5e4 VB |
242 | arg->nonempty = true; |
243 | return -1; | |
244 | } | |
245 | return 0; | |
8b64678e VB |
246 | } |
247 | ||
12db03b6 | 248 | static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held) |
8b64678e | 249 | { |
6676d5e4 | 250 | struct tcf_walker walker = { .fn = walker_check_empty, }; |
8b64678e VB |
251 | |
252 | if (tp->ops->walk) { | |
12db03b6 | 253 | tp->ops->walk(tp, &walker, rtnl_held); |
6676d5e4 | 254 | return !walker.nonempty; |
8b64678e VB |
255 | } |
256 | return true; | |
257 | } | |
258 | ||
12db03b6 | 259 | static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held) |
8b64678e VB |
260 | { |
261 | spin_lock(&tp->lock); | |
12db03b6 | 262 | if (tcf_proto_is_empty(tp, rtnl_held)) |
8b64678e VB |
263 | tp->deleting = true; |
264 | spin_unlock(&tp->lock); | |
265 | return tp->deleting; | |
266 | } | |
267 | ||
268 | static void tcf_proto_mark_delete(struct tcf_proto *tp) | |
269 | { | |
270 | spin_lock(&tp->lock); | |
271 | tp->deleting = true; | |
272 | spin_unlock(&tp->lock); | |
273 | } | |
274 | ||
275 | static bool tcf_proto_is_deleting(struct tcf_proto *tp) | |
276 | { | |
277 | bool deleting; | |
278 | ||
279 | spin_lock(&tp->lock); | |
280 | deleting = tp->deleting; | |
281 | spin_unlock(&tp->lock); | |
282 | ||
283 | return deleting; | |
284 | } | |
285 | ||
c266f64d VB |
286 | #define ASSERT_BLOCK_LOCKED(block) \ |
287 | lockdep_assert_held(&(block)->lock) | |
288 | ||
a9b19443 JP |
289 | struct tcf_filter_chain_list_item { |
290 | struct list_head list; | |
291 | tcf_chain_head_change_t *chain_head_change; | |
292 | void *chain_head_change_priv; | |
293 | }; | |
294 | ||
5bc17018 JP |
295 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
296 | u32 chain_index) | |
2190d1d0 | 297 | { |
5bc17018 JP |
298 | struct tcf_chain *chain; |
299 | ||
c266f64d VB |
300 | ASSERT_BLOCK_LOCKED(block); |
301 | ||
5bc17018 JP |
302 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
303 | if (!chain) | |
304 | return NULL; | |
305 | list_add_tail(&chain->list, &block->chain_list); | |
ed76f5ed | 306 | mutex_init(&chain->filter_chain_lock); |
5bc17018 JP |
307 | chain->block = block; |
308 | chain->index = chain_index; | |
e2ef7544 | 309 | chain->refcnt = 1; |
f71e0ca4 JP |
310 | if (!chain->index) |
311 | block->chain0.chain = chain; | |
5bc17018 | 312 | return chain; |
2190d1d0 JP |
313 | } |
314 | ||
a9b19443 JP |
315 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
316 | struct tcf_proto *tp_head) | |
317 | { | |
318 | if (item->chain_head_change) | |
319 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
320 | } | |
f71e0ca4 JP |
321 | |
322 | static void tcf_chain0_head_change(struct tcf_chain *chain, | |
323 | struct tcf_proto *tp_head) | |
c7eb7d72 | 324 | { |
a9b19443 | 325 | struct tcf_filter_chain_list_item *item; |
f71e0ca4 | 326 | struct tcf_block *block = chain->block; |
a9b19443 | 327 | |
f71e0ca4 JP |
328 | if (chain->index) |
329 | return; | |
165f0135 VB |
330 | |
331 | mutex_lock(&block->lock); | |
f71e0ca4 | 332 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) |
a9b19443 | 333 | tcf_chain_head_change_item(item, tp_head); |
165f0135 | 334 | mutex_unlock(&block->lock); |
c7eb7d72 JP |
335 | } |
336 | ||
c266f64d VB |
337 | /* Returns true if block can be safely freed. */ |
338 | ||
339 | static bool tcf_chain_detach(struct tcf_chain *chain) | |
f93e1cdc | 340 | { |
efbf7897 CW |
341 | struct tcf_block *block = chain->block; |
342 | ||
c266f64d VB |
343 | ASSERT_BLOCK_LOCKED(block); |
344 | ||
e2ef7544 | 345 | list_del(&chain->list); |
f71e0ca4 JP |
346 | if (!chain->index) |
347 | block->chain0.chain = NULL; | |
c266f64d VB |
348 | |
349 | if (list_empty(&block->chain_list) && | |
350 | refcount_read(&block->refcnt) == 0) | |
351 | return true; | |
352 | ||
353 | return false; | |
354 | } | |
355 | ||
356 | static void tcf_block_destroy(struct tcf_block *block) | |
357 | { | |
358 | mutex_destroy(&block->lock); | |
359 | kfree_rcu(block, rcu); | |
360 | } | |
361 | ||
362 | static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block) | |
363 | { | |
364 | struct tcf_block *block = chain->block; | |
365 | ||
ed76f5ed | 366 | mutex_destroy(&chain->filter_chain_lock); |
ee3bbfe8 | 367 | kfree_rcu(chain, rcu); |
c266f64d VB |
368 | if (free_block) |
369 | tcf_block_destroy(block); | |
e2ef7544 | 370 | } |
744a4cf6 | 371 | |
e2ef7544 CW |
372 | static void tcf_chain_hold(struct tcf_chain *chain) |
373 | { | |
c266f64d VB |
374 | ASSERT_BLOCK_LOCKED(chain->block); |
375 | ||
e2ef7544 | 376 | ++chain->refcnt; |
2190d1d0 JP |
377 | } |
378 | ||
3d32f4c5 | 379 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 | 380 | { |
c266f64d VB |
381 | ASSERT_BLOCK_LOCKED(chain->block); |
382 | ||
1f3ed383 | 383 | /* In case all the references are action references, this |
3d32f4c5 | 384 | * chain should not be shown to the user. |
1f3ed383 JP |
385 | */ |
386 | return chain->refcnt == chain->action_refcnt; | |
387 | } | |
388 | ||
32a4f5ec JP |
389 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
390 | u32 chain_index) | |
5bc17018 JP |
391 | { |
392 | struct tcf_chain *chain; | |
393 | ||
c266f64d VB |
394 | ASSERT_BLOCK_LOCKED(block); |
395 | ||
5bc17018 | 396 | list_for_each_entry(chain, &block->chain_list, list) { |
32a4f5ec | 397 | if (chain->index == chain_index) |
e2ef7544 | 398 | return chain; |
32a4f5ec JP |
399 | } |
400 | return NULL; | |
401 | } | |
402 | ||
403 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
404 | u32 seq, u16 flags, int event, bool unicast); | |
405 | ||
53681407 JP |
406 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
407 | u32 chain_index, bool create, | |
408 | bool by_act) | |
32a4f5ec | 409 | { |
c266f64d VB |
410 | struct tcf_chain *chain = NULL; |
411 | bool is_first_reference; | |
32a4f5ec | 412 | |
c266f64d VB |
413 | mutex_lock(&block->lock); |
414 | chain = tcf_chain_lookup(block, chain_index); | |
32a4f5ec JP |
415 | if (chain) { |
416 | tcf_chain_hold(chain); | |
53681407 JP |
417 | } else { |
418 | if (!create) | |
c266f64d | 419 | goto errout; |
53681407 JP |
420 | chain = tcf_chain_create(block, chain_index); |
421 | if (!chain) | |
c266f64d | 422 | goto errout; |
5bc17018 | 423 | } |
80532384 | 424 | |
53681407 JP |
425 | if (by_act) |
426 | ++chain->action_refcnt; | |
c266f64d VB |
427 | is_first_reference = chain->refcnt - chain->action_refcnt == 1; |
428 | mutex_unlock(&block->lock); | |
53681407 JP |
429 | |
430 | /* Send notification only in case we got the first | |
431 | * non-action reference. Until then, the chain acts only as | |
432 | * a placeholder for actions pointing to it and user ought | |
433 | * not know about them. | |
434 | */ | |
c266f64d | 435 | if (is_first_reference && !by_act) |
53681407 JP |
436 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
437 | RTM_NEWCHAIN, false); | |
438 | ||
32a4f5ec | 439 | return chain; |
c266f64d VB |
440 | |
441 | errout: | |
442 | mutex_unlock(&block->lock); | |
443 | return chain; | |
5bc17018 | 444 | } |
53681407 | 445 | |
290b1c8b JP |
446 | static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
447 | bool create) | |
53681407 JP |
448 | { |
449 | return __tcf_chain_get(block, chain_index, create, false); | |
450 | } | |
5bc17018 | 451 | |
1f3ed383 JP |
452 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
453 | { | |
53681407 | 454 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
455 | } |
456 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
457 | ||
a5654820 VB |
458 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
459 | void *tmplt_priv); | |
460 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, | |
461 | void *tmplt_priv, u32 chain_index, | |
462 | struct tcf_block *block, struct sk_buff *oskb, | |
463 | u32 seq, u16 flags, bool unicast); | |
9f407f17 | 464 | |
91052fa1 VB |
465 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act, |
466 | bool explicitly_created) | |
5bc17018 | 467 | { |
c266f64d | 468 | struct tcf_block *block = chain->block; |
a5654820 | 469 | const struct tcf_proto_ops *tmplt_ops; |
b62989fc | 470 | bool free_block = false; |
c266f64d | 471 | unsigned int refcnt; |
a5654820 | 472 | void *tmplt_priv; |
c266f64d VB |
473 | |
474 | mutex_lock(&block->lock); | |
91052fa1 VB |
475 | if (explicitly_created) { |
476 | if (!chain->explicitly_created) { | |
477 | mutex_unlock(&block->lock); | |
478 | return; | |
479 | } | |
480 | chain->explicitly_created = false; | |
481 | } | |
482 | ||
53681407 JP |
483 | if (by_act) |
484 | chain->action_refcnt--; | |
c266f64d VB |
485 | |
486 | /* tc_chain_notify_delete can't be called while holding block lock. | |
487 | * However, when block is unlocked chain can be changed concurrently, so | |
488 | * save these to temporary variables. | |
489 | */ | |
490 | refcnt = --chain->refcnt; | |
a5654820 VB |
491 | tmplt_ops = chain->tmplt_ops; |
492 | tmplt_priv = chain->tmplt_priv; | |
53681407 JP |
493 | |
494 | /* The last dropped non-action reference will trigger notification. */ | |
b62989fc VB |
495 | if (refcnt - chain->action_refcnt == 0 && !by_act) { |
496 | tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index, | |
a5654820 | 497 | block, NULL, 0, 0, false); |
726d0612 VB |
498 | /* Last reference to chain, no need to lock. */ |
499 | chain->flushing = false; | |
500 | } | |
53681407 | 501 | |
b62989fc VB |
502 | if (refcnt == 0) |
503 | free_block = tcf_chain_detach(chain); | |
504 | mutex_unlock(&block->lock); | |
505 | ||
c266f64d | 506 | if (refcnt == 0) { |
a5654820 | 507 | tc_chain_tmplt_del(tmplt_ops, tmplt_priv); |
c266f64d | 508 | tcf_chain_destroy(chain, free_block); |
32a4f5ec | 509 | } |
5bc17018 | 510 | } |
53681407 | 511 | |
290b1c8b | 512 | static void tcf_chain_put(struct tcf_chain *chain) |
53681407 | 513 | { |
91052fa1 | 514 | __tcf_chain_put(chain, false, false); |
53681407 | 515 | } |
5bc17018 | 516 | |
1f3ed383 JP |
517 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
518 | { | |
91052fa1 | 519 | __tcf_chain_put(chain, true, false); |
1f3ed383 JP |
520 | } |
521 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
522 | ||
32a4f5ec JP |
523 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
524 | { | |
91052fa1 | 525 | __tcf_chain_put(chain, false, true); |
32a4f5ec JP |
526 | } |
527 | ||
12db03b6 | 528 | static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held) |
290b1c8b | 529 | { |
4dbfa766 | 530 | struct tcf_proto *tp, *tp_next; |
290b1c8b | 531 | |
ed76f5ed VB |
532 | mutex_lock(&chain->filter_chain_lock); |
533 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
4dbfa766 | 534 | RCU_INIT_POINTER(chain->filter_chain, NULL); |
290b1c8b | 535 | tcf_chain0_head_change(chain, NULL); |
726d0612 | 536 | chain->flushing = true; |
ed76f5ed VB |
537 | mutex_unlock(&chain->filter_chain_lock); |
538 | ||
290b1c8b | 539 | while (tp) { |
4dbfa766 | 540 | tp_next = rcu_dereference_protected(tp->next, 1); |
12db03b6 | 541 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 | 542 | tp = tp_next; |
290b1c8b JP |
543 | } |
544 | } | |
545 | ||
7f76fa36 JH |
546 | static struct tcf_block *tc_dev_ingress_block(struct net_device *dev) |
547 | { | |
548 | const struct Qdisc_class_ops *cops; | |
549 | struct Qdisc *qdisc; | |
550 | ||
551 | if (!dev_ingress_queue(dev)) | |
552 | return NULL; | |
553 | ||
554 | qdisc = dev_ingress_queue(dev)->qdisc_sleeping; | |
555 | if (!qdisc) | |
556 | return NULL; | |
557 | ||
558 | cops = qdisc->ops->cl_ops; | |
559 | if (!cops) | |
560 | return NULL; | |
561 | ||
562 | if (!cops->tcf_block) | |
563 | return NULL; | |
564 | ||
565 | return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL); | |
566 | } | |
567 | ||
568 | static struct rhashtable indr_setup_block_ht; | |
569 | ||
570 | struct tc_indr_block_dev { | |
571 | struct rhash_head ht_node; | |
572 | struct net_device *dev; | |
573 | unsigned int refcnt; | |
574 | struct list_head cb_list; | |
575 | struct tcf_block *block; | |
576 | }; | |
577 | ||
578 | struct tc_indr_block_cb { | |
579 | struct list_head list; | |
580 | void *cb_priv; | |
581 | tc_indr_block_bind_cb_t *cb; | |
582 | void *cb_ident; | |
583 | }; | |
584 | ||
585 | static const struct rhashtable_params tc_indr_setup_block_ht_params = { | |
586 | .key_offset = offsetof(struct tc_indr_block_dev, dev), | |
587 | .head_offset = offsetof(struct tc_indr_block_dev, ht_node), | |
588 | .key_len = sizeof(struct net_device *), | |
589 | }; | |
590 | ||
591 | static struct tc_indr_block_dev * | |
592 | tc_indr_block_dev_lookup(struct net_device *dev) | |
593 | { | |
594 | return rhashtable_lookup_fast(&indr_setup_block_ht, &dev, | |
595 | tc_indr_setup_block_ht_params); | |
596 | } | |
597 | ||
598 | static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev) | |
599 | { | |
600 | struct tc_indr_block_dev *indr_dev; | |
601 | ||
602 | indr_dev = tc_indr_block_dev_lookup(dev); | |
603 | if (indr_dev) | |
604 | goto inc_ref; | |
605 | ||
606 | indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL); | |
607 | if (!indr_dev) | |
608 | return NULL; | |
609 | ||
610 | INIT_LIST_HEAD(&indr_dev->cb_list); | |
611 | indr_dev->dev = dev; | |
612 | indr_dev->block = tc_dev_ingress_block(dev); | |
613 | if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
614 | tc_indr_setup_block_ht_params)) { | |
615 | kfree(indr_dev); | |
616 | return NULL; | |
617 | } | |
618 | ||
619 | inc_ref: | |
620 | indr_dev->refcnt++; | |
621 | return indr_dev; | |
622 | } | |
623 | ||
624 | static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev) | |
625 | { | |
626 | if (--indr_dev->refcnt) | |
627 | return; | |
628 | ||
629 | rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
630 | tc_indr_setup_block_ht_params); | |
631 | kfree(indr_dev); | |
632 | } | |
633 | ||
634 | static struct tc_indr_block_cb * | |
635 | tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev, | |
636 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
637 | { | |
638 | struct tc_indr_block_cb *indr_block_cb; | |
639 | ||
640 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
641 | if (indr_block_cb->cb == cb && | |
642 | indr_block_cb->cb_ident == cb_ident) | |
643 | return indr_block_cb; | |
644 | return NULL; | |
645 | } | |
646 | ||
647 | static struct tc_indr_block_cb * | |
648 | tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv, | |
649 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
650 | { | |
651 | struct tc_indr_block_cb *indr_block_cb; | |
652 | ||
653 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
654 | if (indr_block_cb) | |
655 | return ERR_PTR(-EEXIST); | |
656 | ||
657 | indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL); | |
658 | if (!indr_block_cb) | |
659 | return ERR_PTR(-ENOMEM); | |
660 | ||
661 | indr_block_cb->cb_priv = cb_priv; | |
662 | indr_block_cb->cb = cb; | |
663 | indr_block_cb->cb_ident = cb_ident; | |
664 | list_add(&indr_block_cb->list, &indr_dev->cb_list); | |
665 | ||
666 | return indr_block_cb; | |
667 | } | |
668 | ||
669 | static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb) | |
670 | { | |
671 | list_del(&indr_block_cb->list); | |
672 | kfree(indr_block_cb); | |
673 | } | |
674 | ||
675 | static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev, | |
676 | struct tc_indr_block_cb *indr_block_cb, | |
677 | enum tc_block_command command) | |
678 | { | |
679 | struct tc_block_offload bo = { | |
680 | .command = command, | |
681 | .binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS, | |
682 | .block = indr_dev->block, | |
683 | }; | |
684 | ||
685 | if (!indr_dev->block) | |
686 | return; | |
687 | ||
688 | indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, | |
689 | &bo); | |
690 | } | |
691 | ||
692 | int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
693 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
694 | { | |
695 | struct tc_indr_block_cb *indr_block_cb; | |
696 | struct tc_indr_block_dev *indr_dev; | |
697 | int err; | |
698 | ||
699 | indr_dev = tc_indr_block_dev_get(dev); | |
700 | if (!indr_dev) | |
701 | return -ENOMEM; | |
702 | ||
703 | indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident); | |
704 | err = PTR_ERR_OR_ZERO(indr_block_cb); | |
705 | if (err) | |
706 | goto err_dev_put; | |
707 | ||
708 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND); | |
709 | return 0; | |
710 | ||
711 | err_dev_put: | |
712 | tc_indr_block_dev_put(indr_dev); | |
713 | return err; | |
714 | } | |
715 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register); | |
716 | ||
717 | int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
718 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
719 | { | |
720 | int err; | |
721 | ||
722 | rtnl_lock(); | |
723 | err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident); | |
724 | rtnl_unlock(); | |
725 | ||
726 | return err; | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_register); | |
729 | ||
730 | void __tc_indr_block_cb_unregister(struct net_device *dev, | |
731 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
732 | { | |
733 | struct tc_indr_block_cb *indr_block_cb; | |
734 | struct tc_indr_block_dev *indr_dev; | |
735 | ||
736 | indr_dev = tc_indr_block_dev_lookup(dev); | |
737 | if (!indr_dev) | |
738 | return; | |
739 | ||
740 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
741 | if (!indr_block_cb) | |
742 | return; | |
743 | ||
744 | /* Send unbind message if required to free any block cbs. */ | |
745 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND); | |
746 | tc_indr_block_cb_del(indr_block_cb); | |
747 | tc_indr_block_dev_put(indr_dev); | |
748 | } | |
749 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister); | |
750 | ||
751 | void tc_indr_block_cb_unregister(struct net_device *dev, | |
752 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
753 | { | |
754 | rtnl_lock(); | |
755 | __tc_indr_block_cb_unregister(dev, cb, cb_ident); | |
756 | rtnl_unlock(); | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister); | |
759 | ||
760 | static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev, | |
761 | struct tcf_block_ext_info *ei, | |
762 | enum tc_block_command command, | |
763 | struct netlink_ext_ack *extack) | |
764 | { | |
765 | struct tc_indr_block_cb *indr_block_cb; | |
766 | struct tc_indr_block_dev *indr_dev; | |
767 | struct tc_block_offload bo = { | |
768 | .command = command, | |
769 | .binder_type = ei->binder_type, | |
770 | .block = block, | |
771 | .extack = extack, | |
772 | }; | |
773 | ||
774 | indr_dev = tc_indr_block_dev_lookup(dev); | |
775 | if (!indr_dev) | |
776 | return; | |
777 | ||
778 | indr_dev->block = command == TC_BLOCK_BIND ? block : NULL; | |
779 | ||
780 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
781 | indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, | |
782 | &bo); | |
783 | } | |
784 | ||
caa72601 JP |
785 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
786 | { | |
787 | return block->offloadcnt; | |
788 | } | |
789 | ||
790 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
791 | struct net_device *dev, | |
792 | struct tcf_block_ext_info *ei, | |
60513bd8 JH |
793 | enum tc_block_command command, |
794 | struct netlink_ext_ack *extack) | |
8c4083b3 | 795 | { |
8c4083b3 JP |
796 | struct tc_block_offload bo = {}; |
797 | ||
8c4083b3 JP |
798 | bo.command = command; |
799 | bo.binder_type = ei->binder_type; | |
800 | bo.block = block; | |
60513bd8 | 801 | bo.extack = extack; |
caa72601 | 802 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); |
8c4083b3 JP |
803 | } |
804 | ||
caa72601 | 805 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
806 | struct tcf_block_ext_info *ei, |
807 | struct netlink_ext_ack *extack) | |
8c4083b3 | 808 | { |
caa72601 JP |
809 | struct net_device *dev = q->dev_queue->dev; |
810 | int err; | |
811 | ||
812 | if (!dev->netdev_ops->ndo_setup_tc) | |
813 | goto no_offload_dev_inc; | |
814 | ||
815 | /* If tc offload feature is disabled and the block we try to bind | |
816 | * to already has some offloaded filters, forbid to bind. | |
817 | */ | |
60513bd8 JH |
818 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
819 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 820 | return -EOPNOTSUPP; |
60513bd8 | 821 | } |
caa72601 | 822 | |
60513bd8 | 823 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 JP |
824 | if (err == -EOPNOTSUPP) |
825 | goto no_offload_dev_inc; | |
7f76fa36 JH |
826 | if (err) |
827 | return err; | |
828 | ||
829 | tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack); | |
830 | return 0; | |
caa72601 JP |
831 | |
832 | no_offload_dev_inc: | |
833 | if (tcf_block_offload_in_use(block)) | |
834 | return -EOPNOTSUPP; | |
835 | block->nooffloaddevcnt++; | |
7f76fa36 | 836 | tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack); |
caa72601 | 837 | return 0; |
8c4083b3 JP |
838 | } |
839 | ||
840 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
841 | struct tcf_block_ext_info *ei) | |
842 | { | |
caa72601 JP |
843 | struct net_device *dev = q->dev_queue->dev; |
844 | int err; | |
845 | ||
7f76fa36 JH |
846 | tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
847 | ||
caa72601 JP |
848 | if (!dev->netdev_ops->ndo_setup_tc) |
849 | goto no_offload_dev_dec; | |
60513bd8 | 850 | err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL); |
caa72601 JP |
851 | if (err == -EOPNOTSUPP) |
852 | goto no_offload_dev_dec; | |
853 | return; | |
854 | ||
855 | no_offload_dev_dec: | |
856 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
857 | } |
858 | ||
a9b19443 | 859 | static int |
f71e0ca4 JP |
860 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
861 | struct tcf_block_ext_info *ei, | |
862 | struct netlink_ext_ack *extack) | |
a9b19443 JP |
863 | { |
864 | struct tcf_filter_chain_list_item *item; | |
165f0135 | 865 | struct tcf_chain *chain0; |
a9b19443 JP |
866 | |
867 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
868 | if (!item) { | |
869 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
870 | return -ENOMEM; | |
871 | } | |
872 | item->chain_head_change = ei->chain_head_change; | |
873 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
165f0135 VB |
874 | |
875 | mutex_lock(&block->lock); | |
876 | chain0 = block->chain0.chain; | |
ed76f5ed VB |
877 | if (chain0) |
878 | tcf_chain_hold(chain0); | |
879 | else | |
880 | list_add(&item->list, &block->chain0.filter_chain_list); | |
165f0135 VB |
881 | mutex_unlock(&block->lock); |
882 | ||
ed76f5ed VB |
883 | if (chain0) { |
884 | struct tcf_proto *tp_head; | |
885 | ||
886 | mutex_lock(&chain0->filter_chain_lock); | |
887 | ||
888 | tp_head = tcf_chain_dereference(chain0->filter_chain, chain0); | |
889 | if (tp_head) | |
890 | tcf_chain_head_change_item(item, tp_head); | |
891 | ||
892 | mutex_lock(&block->lock); | |
893 | list_add(&item->list, &block->chain0.filter_chain_list); | |
894 | mutex_unlock(&block->lock); | |
895 | ||
896 | mutex_unlock(&chain0->filter_chain_lock); | |
897 | tcf_chain_put(chain0); | |
898 | } | |
899 | ||
a9b19443 JP |
900 | return 0; |
901 | } | |
902 | ||
903 | static void | |
f71e0ca4 JP |
904 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
905 | struct tcf_block_ext_info *ei) | |
a9b19443 JP |
906 | { |
907 | struct tcf_filter_chain_list_item *item; | |
908 | ||
165f0135 | 909 | mutex_lock(&block->lock); |
f71e0ca4 | 910 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
911 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
912 | (item->chain_head_change == ei->chain_head_change && | |
913 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
165f0135 | 914 | if (block->chain0.chain) |
f71e0ca4 | 915 | tcf_chain_head_change_item(item, NULL); |
a9b19443 | 916 | list_del(&item->list); |
165f0135 VB |
917 | mutex_unlock(&block->lock); |
918 | ||
a9b19443 JP |
919 | kfree(item); |
920 | return; | |
921 | } | |
922 | } | |
165f0135 | 923 | mutex_unlock(&block->lock); |
a9b19443 JP |
924 | WARN_ON(1); |
925 | } | |
926 | ||
48617387 | 927 | struct tcf_net { |
ab281629 | 928 | spinlock_t idr_lock; /* Protects idr */ |
48617387 JP |
929 | struct idr idr; |
930 | }; | |
931 | ||
932 | static unsigned int tcf_net_id; | |
933 | ||
934 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 935 | struct netlink_ext_ack *extack) |
a9b19443 | 936 | { |
48617387 | 937 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
ab281629 VB |
938 | int err; |
939 | ||
940 | idr_preload(GFP_KERNEL); | |
941 | spin_lock(&tn->idr_lock); | |
942 | err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, | |
943 | GFP_NOWAIT); | |
944 | spin_unlock(&tn->idr_lock); | |
945 | idr_preload_end(); | |
48617387 | 946 | |
ab281629 | 947 | return err; |
a9b19443 JP |
948 | } |
949 | ||
48617387 JP |
950 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
951 | { | |
952 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
953 | ||
ab281629 | 954 | spin_lock(&tn->idr_lock); |
9c160941 | 955 | idr_remove(&tn->idr, block->index); |
ab281629 | 956 | spin_unlock(&tn->idr_lock); |
48617387 JP |
957 | } |
958 | ||
959 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 960 | u32 block_index, |
48617387 | 961 | struct netlink_ext_ack *extack) |
6529eaba | 962 | { |
48617387 | 963 | struct tcf_block *block; |
6529eaba | 964 | |
48617387 | 965 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
966 | if (!block) { |
967 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 968 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 969 | } |
c266f64d | 970 | mutex_init(&block->lock); |
5bc17018 | 971 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 | 972 | INIT_LIST_HEAD(&block->cb_list); |
f36fe1c4 | 973 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 974 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 975 | |
cfebd7e2 | 976 | refcount_set(&block->refcnt, 1); |
48617387 | 977 | block->net = net; |
bb047ddd JP |
978 | block->index = block_index; |
979 | ||
980 | /* Don't store q pointer for blocks which are shared */ | |
981 | if (!tcf_block_shared(block)) | |
982 | block->q = q; | |
48617387 | 983 | return block; |
48617387 JP |
984 | } |
985 | ||
986 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
987 | { | |
988 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
989 | ||
322d884b | 990 | return idr_find(&tn->idr, block_index); |
48617387 JP |
991 | } |
992 | ||
0607e439 VB |
993 | static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
994 | { | |
995 | struct tcf_block *block; | |
996 | ||
997 | rcu_read_lock(); | |
998 | block = tcf_block_lookup(net, block_index); | |
999 | if (block && !refcount_inc_not_zero(&block->refcnt)) | |
1000 | block = NULL; | |
1001 | rcu_read_unlock(); | |
1002 | ||
1003 | return block; | |
1004 | } | |
1005 | ||
bbf73830 VB |
1006 | static struct tcf_chain * |
1007 | __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 1008 | { |
bbf73830 VB |
1009 | mutex_lock(&block->lock); |
1010 | if (chain) | |
1011 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
1012 | NULL : list_next_entry(chain, list); | |
1013 | else | |
1014 | chain = list_first_entry_or_null(&block->chain_list, | |
1015 | struct tcf_chain, list); | |
f0023436 | 1016 | |
bbf73830 VB |
1017 | /* skip all action-only chains */ |
1018 | while (chain && tcf_chain_held_by_acts_only(chain)) | |
1019 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
1020 | NULL : list_next_entry(chain, list); | |
1021 | ||
1022 | if (chain) | |
f0023436 | 1023 | tcf_chain_hold(chain); |
bbf73830 | 1024 | mutex_unlock(&block->lock); |
f0023436 | 1025 | |
bbf73830 | 1026 | return chain; |
f0023436 VB |
1027 | } |
1028 | ||
bbf73830 VB |
1029 | /* Function to be used by all clients that want to iterate over all chains on |
1030 | * block. It properly obtains block->lock and takes reference to chain before | |
1031 | * returning it. Users of this function must be tolerant to concurrent chain | |
1032 | * insertion/deletion or ensure that no concurrent chain modification is | |
1033 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
1034 | * consistent dump because rtnl lock is released each time skb is filled with | |
1035 | * data and sent to user-space. | |
1036 | */ | |
1037 | ||
1038 | struct tcf_chain * | |
1039 | tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 1040 | { |
bbf73830 | 1041 | struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain); |
f0023436 | 1042 | |
bbf73830 | 1043 | if (chain) |
f0023436 | 1044 | tcf_chain_put(chain); |
bbf73830 VB |
1045 | |
1046 | return chain_next; | |
1047 | } | |
1048 | EXPORT_SYMBOL(tcf_get_next_chain); | |
1049 | ||
fe2923af VB |
1050 | static struct tcf_proto * |
1051 | __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) | |
1052 | { | |
8b64678e VB |
1053 | u32 prio = 0; |
1054 | ||
fe2923af VB |
1055 | ASSERT_RTNL(); |
1056 | mutex_lock(&chain->filter_chain_lock); | |
1057 | ||
8b64678e | 1058 | if (!tp) { |
fe2923af | 1059 | tp = tcf_chain_dereference(chain->filter_chain, chain); |
8b64678e VB |
1060 | } else if (tcf_proto_is_deleting(tp)) { |
1061 | /* 'deleting' flag is set and chain->filter_chain_lock was | |
1062 | * unlocked, which means next pointer could be invalid. Restart | |
1063 | * search. | |
1064 | */ | |
1065 | prio = tp->prio + 1; | |
1066 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
1067 | ||
1068 | for (; tp; tp = tcf_chain_dereference(tp->next, chain)) | |
1069 | if (!tp->deleting && tp->prio >= prio) | |
1070 | break; | |
1071 | } else { | |
fe2923af | 1072 | tp = tcf_chain_dereference(tp->next, chain); |
8b64678e | 1073 | } |
fe2923af VB |
1074 | |
1075 | if (tp) | |
1076 | tcf_proto_get(tp); | |
1077 | ||
1078 | mutex_unlock(&chain->filter_chain_lock); | |
1079 | ||
1080 | return tp; | |
1081 | } | |
1082 | ||
1083 | /* Function to be used by all clients that want to iterate over all tp's on | |
1084 | * chain. Users of this function must be tolerant to concurrent tp | |
1085 | * insertion/deletion or ensure that no concurrent chain modification is | |
1086 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
1087 | * consistent dump because rtnl lock is released each time skb is filled with | |
1088 | * data and sent to user-space. | |
1089 | */ | |
1090 | ||
1091 | struct tcf_proto * | |
12db03b6 VB |
1092 | tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp, |
1093 | bool rtnl_held) | |
fe2923af VB |
1094 | { |
1095 | struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp); | |
1096 | ||
1097 | if (tp) | |
12db03b6 | 1098 | tcf_proto_put(tp, rtnl_held, NULL); |
fe2923af VB |
1099 | |
1100 | return tp_next; | |
1101 | } | |
1102 | EXPORT_SYMBOL(tcf_get_next_proto); | |
1103 | ||
12db03b6 | 1104 | static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held) |
bbf73830 VB |
1105 | { |
1106 | struct tcf_chain *chain; | |
1107 | ||
1108 | /* Last reference to block. At this point chains cannot be added or | |
1109 | * removed concurrently. | |
1110 | */ | |
1111 | for (chain = tcf_get_next_chain(block, NULL); | |
1112 | chain; | |
1113 | chain = tcf_get_next_chain(block, chain)) { | |
1114 | tcf_chain_put_explicitly_created(chain); | |
12db03b6 | 1115 | tcf_chain_flush(chain, rtnl_held); |
f0023436 VB |
1116 | } |
1117 | } | |
1118 | ||
18d3eefb VB |
1119 | /* Lookup Qdisc and increments its reference counter. |
1120 | * Set parent, if necessary. | |
1121 | */ | |
1122 | ||
1123 | static int __tcf_qdisc_find(struct net *net, struct Qdisc **q, | |
1124 | u32 *parent, int ifindex, bool rtnl_held, | |
1125 | struct netlink_ext_ack *extack) | |
1126 | { | |
1127 | const struct Qdisc_class_ops *cops; | |
1128 | struct net_device *dev; | |
1129 | int err = 0; | |
1130 | ||
1131 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1132 | return 0; | |
1133 | ||
1134 | rcu_read_lock(); | |
1135 | ||
1136 | /* Find link */ | |
1137 | dev = dev_get_by_index_rcu(net, ifindex); | |
1138 | if (!dev) { | |
1139 | rcu_read_unlock(); | |
1140 | return -ENODEV; | |
1141 | } | |
1142 | ||
1143 | /* Find qdisc */ | |
1144 | if (!*parent) { | |
1145 | *q = dev->qdisc; | |
1146 | *parent = (*q)->handle; | |
1147 | } else { | |
1148 | *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); | |
1149 | if (!*q) { | |
1150 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1151 | err = -EINVAL; | |
1152 | goto errout_rcu; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | *q = qdisc_refcount_inc_nz(*q); | |
1157 | if (!*q) { | |
1158 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1159 | err = -EINVAL; | |
1160 | goto errout_rcu; | |
1161 | } | |
1162 | ||
1163 | /* Is it classful? */ | |
1164 | cops = (*q)->ops->cl_ops; | |
1165 | if (!cops) { | |
1166 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
1167 | err = -EINVAL; | |
1168 | goto errout_qdisc; | |
1169 | } | |
1170 | ||
1171 | if (!cops->tcf_block) { | |
1172 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
1173 | err = -EOPNOTSUPP; | |
1174 | goto errout_qdisc; | |
1175 | } | |
1176 | ||
1177 | errout_rcu: | |
1178 | /* At this point we know that qdisc is not noop_qdisc, | |
1179 | * which means that qdisc holds a reference to net_device | |
1180 | * and we hold a reference to qdisc, so it is safe to release | |
1181 | * rcu read lock. | |
1182 | */ | |
1183 | rcu_read_unlock(); | |
1184 | return err; | |
1185 | ||
1186 | errout_qdisc: | |
1187 | rcu_read_unlock(); | |
1188 | ||
1189 | if (rtnl_held) | |
1190 | qdisc_put(*q); | |
1191 | else | |
1192 | qdisc_put_unlocked(*q); | |
1193 | *q = NULL; | |
1194 | ||
1195 | return err; | |
1196 | } | |
1197 | ||
1198 | static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl, | |
1199 | int ifindex, struct netlink_ext_ack *extack) | |
1200 | { | |
1201 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1202 | return 0; | |
1203 | ||
1204 | /* Do we search for filter, attached to class? */ | |
1205 | if (TC_H_MIN(parent)) { | |
1206 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1207 | ||
1208 | *cl = cops->find(q, parent); | |
1209 | if (*cl == 0) { | |
1210 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
1211 | return -ENOENT; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q, | |
1219 | unsigned long cl, int ifindex, | |
1220 | u32 block_index, | |
1221 | struct netlink_ext_ack *extack) | |
1222 | { | |
1223 | struct tcf_block *block; | |
1224 | ||
1225 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
1226 | block = tcf_block_refcnt_get(net, block_index); | |
1227 | if (!block) { | |
1228 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
1229 | return ERR_PTR(-EINVAL); | |
1230 | } | |
1231 | } else { | |
1232 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1233 | ||
1234 | block = cops->tcf_block(q, cl, extack); | |
1235 | if (!block) | |
1236 | return ERR_PTR(-EINVAL); | |
1237 | ||
1238 | if (tcf_block_shared(block)) { | |
1239 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
1240 | return ERR_PTR(-EOPNOTSUPP); | |
1241 | } | |
1242 | ||
1243 | /* Always take reference to block in order to support execution | |
1244 | * of rules update path of cls API without rtnl lock. Caller | |
1245 | * must release block when it is finished using it. 'if' block | |
1246 | * of this conditional obtain reference to block by calling | |
1247 | * tcf_block_refcnt_get(). | |
1248 | */ | |
1249 | refcount_inc(&block->refcnt); | |
1250 | } | |
1251 | ||
1252 | return block; | |
1253 | } | |
1254 | ||
0607e439 | 1255 | static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
12db03b6 | 1256 | struct tcf_block_ext_info *ei, bool rtnl_held) |
0607e439 | 1257 | { |
c266f64d | 1258 | if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) { |
0607e439 VB |
1259 | /* Flushing/putting all chains will cause the block to be |
1260 | * deallocated when last chain is freed. However, if chain_list | |
1261 | * is empty, block has to be manually deallocated. After block | |
1262 | * reference counter reached 0, it is no longer possible to | |
1263 | * increment it or add new chains to block. | |
1264 | */ | |
1265 | bool free_block = list_empty(&block->chain_list); | |
1266 | ||
c266f64d | 1267 | mutex_unlock(&block->lock); |
0607e439 VB |
1268 | if (tcf_block_shared(block)) |
1269 | tcf_block_remove(block, block->net); | |
0607e439 VB |
1270 | |
1271 | if (q) | |
1272 | tcf_block_offload_unbind(block, q, ei); | |
1273 | ||
1274 | if (free_block) | |
c266f64d | 1275 | tcf_block_destroy(block); |
0607e439 | 1276 | else |
12db03b6 | 1277 | tcf_block_flush_all_chains(block, rtnl_held); |
0607e439 VB |
1278 | } else if (q) { |
1279 | tcf_block_offload_unbind(block, q, ei); | |
1280 | } | |
1281 | } | |
1282 | ||
12db03b6 | 1283 | static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held) |
0607e439 | 1284 | { |
12db03b6 | 1285 | __tcf_block_put(block, NULL, NULL, rtnl_held); |
0607e439 VB |
1286 | } |
1287 | ||
c431f89b VB |
1288 | /* Find tcf block. |
1289 | * Set q, parent, cl when appropriate. | |
1290 | */ | |
1291 | ||
1292 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
1293 | u32 *parent, unsigned long *cl, | |
1294 | int ifindex, u32 block_index, | |
1295 | struct netlink_ext_ack *extack) | |
1296 | { | |
1297 | struct tcf_block *block; | |
e368fdb6 | 1298 | int err = 0; |
c431f89b | 1299 | |
18d3eefb | 1300 | ASSERT_RTNL(); |
e368fdb6 | 1301 | |
18d3eefb VB |
1302 | err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack); |
1303 | if (err) | |
1304 | goto errout; | |
c431f89b | 1305 | |
18d3eefb VB |
1306 | err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack); |
1307 | if (err) | |
1308 | goto errout_qdisc; | |
787ce6d0 | 1309 | |
18d3eefb | 1310 | block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack); |
af736bf0 DC |
1311 | if (IS_ERR(block)) { |
1312 | err = PTR_ERR(block); | |
18d3eefb | 1313 | goto errout_qdisc; |
af736bf0 | 1314 | } |
c431f89b VB |
1315 | |
1316 | return block; | |
e368fdb6 | 1317 | |
e368fdb6 | 1318 | errout_qdisc: |
18d3eefb | 1319 | if (*q) |
e368fdb6 | 1320 | qdisc_put(*q); |
18d3eefb VB |
1321 | errout: |
1322 | *q = NULL; | |
e368fdb6 VB |
1323 | return ERR_PTR(err); |
1324 | } | |
1325 | ||
12db03b6 VB |
1326 | static void tcf_block_release(struct Qdisc *q, struct tcf_block *block, |
1327 | bool rtnl_held) | |
e368fdb6 | 1328 | { |
787ce6d0 | 1329 | if (!IS_ERR_OR_NULL(block)) |
12db03b6 | 1330 | tcf_block_refcnt_put(block, rtnl_held); |
787ce6d0 | 1331 | |
470502de VB |
1332 | if (q) { |
1333 | if (rtnl_held) | |
1334 | qdisc_put(q); | |
1335 | else | |
1336 | qdisc_put_unlocked(q); | |
1337 | } | |
c431f89b VB |
1338 | } |
1339 | ||
f36fe1c4 JP |
1340 | struct tcf_block_owner_item { |
1341 | struct list_head list; | |
1342 | struct Qdisc *q; | |
1343 | enum tcf_block_binder_type binder_type; | |
1344 | }; | |
1345 | ||
1346 | static void | |
1347 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
1348 | struct Qdisc *q, | |
1349 | enum tcf_block_binder_type binder_type) | |
1350 | { | |
1351 | if (block->keep_dst && | |
1352 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS && | |
1353 | binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
1354 | netif_keep_dst(qdisc_dev(q)); | |
1355 | } | |
1356 | ||
1357 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
1358 | { | |
1359 | struct tcf_block_owner_item *item; | |
1360 | ||
1361 | block->keep_dst = true; | |
1362 | list_for_each_entry(item, &block->owner_list, list) | |
1363 | tcf_block_owner_netif_keep_dst(block, item->q, | |
1364 | item->binder_type); | |
1365 | } | |
1366 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
1367 | ||
1368 | static int tcf_block_owner_add(struct tcf_block *block, | |
1369 | struct Qdisc *q, | |
1370 | enum tcf_block_binder_type binder_type) | |
1371 | { | |
1372 | struct tcf_block_owner_item *item; | |
1373 | ||
1374 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
1375 | if (!item) | |
1376 | return -ENOMEM; | |
1377 | item->q = q; | |
1378 | item->binder_type = binder_type; | |
1379 | list_add(&item->list, &block->owner_list); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static void tcf_block_owner_del(struct tcf_block *block, | |
1384 | struct Qdisc *q, | |
1385 | enum tcf_block_binder_type binder_type) | |
1386 | { | |
1387 | struct tcf_block_owner_item *item; | |
1388 | ||
1389 | list_for_each_entry(item, &block->owner_list, list) { | |
1390 | if (item->q == q && item->binder_type == binder_type) { | |
1391 | list_del(&item->list); | |
1392 | kfree(item); | |
1393 | return; | |
1394 | } | |
1395 | } | |
1396 | WARN_ON(1); | |
1397 | } | |
1398 | ||
48617387 JP |
1399 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
1400 | struct tcf_block_ext_info *ei, | |
1401 | struct netlink_ext_ack *extack) | |
1402 | { | |
1403 | struct net *net = qdisc_net(q); | |
1404 | struct tcf_block *block = NULL; | |
48617387 JP |
1405 | int err; |
1406 | ||
787ce6d0 | 1407 | if (ei->block_index) |
48617387 | 1408 | /* block_index not 0 means the shared block is requested */ |
787ce6d0 | 1409 | block = tcf_block_refcnt_get(net, ei->block_index); |
48617387 JP |
1410 | |
1411 | if (!block) { | |
bb047ddd | 1412 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
1413 | if (IS_ERR(block)) |
1414 | return PTR_ERR(block); | |
bb047ddd JP |
1415 | if (tcf_block_shared(block)) { |
1416 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
1417 | if (err) |
1418 | goto err_block_insert; | |
1419 | } | |
1420 | } | |
1421 | ||
f36fe1c4 JP |
1422 | err = tcf_block_owner_add(block, q, ei->binder_type); |
1423 | if (err) | |
1424 | goto err_block_owner_add; | |
1425 | ||
1426 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
1427 | ||
f71e0ca4 | 1428 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 1429 | if (err) |
f71e0ca4 | 1430 | goto err_chain0_head_change_cb_add; |
caa72601 | 1431 | |
60513bd8 | 1432 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
1433 | if (err) |
1434 | goto err_block_offload_bind; | |
1435 | ||
6529eaba JP |
1436 | *p_block = block; |
1437 | return 0; | |
2190d1d0 | 1438 | |
caa72601 | 1439 | err_block_offload_bind: |
f71e0ca4 JP |
1440 | tcf_chain0_head_change_cb_del(block, ei); |
1441 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
1442 | tcf_block_owner_del(block, q, ei->binder_type); |
1443 | err_block_owner_add: | |
48617387 | 1444 | err_block_insert: |
12db03b6 | 1445 | tcf_block_refcnt_put(block, true); |
2190d1d0 | 1446 | return err; |
6529eaba | 1447 | } |
8c4083b3 JP |
1448 | EXPORT_SYMBOL(tcf_block_get_ext); |
1449 | ||
c7eb7d72 JP |
1450 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
1451 | { | |
1452 | struct tcf_proto __rcu **p_filter_chain = priv; | |
1453 | ||
1454 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
1455 | } | |
1456 | ||
8c4083b3 | 1457 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
1458 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
1459 | struct netlink_ext_ack *extack) | |
8c4083b3 | 1460 | { |
c7eb7d72 JP |
1461 | struct tcf_block_ext_info ei = { |
1462 | .chain_head_change = tcf_chain_head_change_dflt, | |
1463 | .chain_head_change_priv = p_filter_chain, | |
1464 | }; | |
8c4083b3 | 1465 | |
c7eb7d72 | 1466 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 1467 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 1468 | } |
6529eaba JP |
1469 | EXPORT_SYMBOL(tcf_block_get); |
1470 | ||
7aa0045d | 1471 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 1472 | * actions should be all removed after flushing. |
7aa0045d | 1473 | */ |
c7eb7d72 | 1474 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 1475 | struct tcf_block_ext_info *ei) |
7aa0045d | 1476 | { |
c30abd5e DM |
1477 | if (!block) |
1478 | return; | |
f71e0ca4 | 1479 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 1480 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 1481 | |
12db03b6 | 1482 | __tcf_block_put(block, q, ei, true); |
6529eaba | 1483 | } |
8c4083b3 JP |
1484 | EXPORT_SYMBOL(tcf_block_put_ext); |
1485 | ||
1486 | void tcf_block_put(struct tcf_block *block) | |
1487 | { | |
1488 | struct tcf_block_ext_info ei = {0, }; | |
1489 | ||
4853f128 JP |
1490 | if (!block) |
1491 | return; | |
c7eb7d72 | 1492 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 1493 | } |
e1ea2f98 | 1494 | |
6529eaba | 1495 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 1496 | |
acb67442 JP |
1497 | struct tcf_block_cb { |
1498 | struct list_head list; | |
1499 | tc_setup_cb_t *cb; | |
1500 | void *cb_ident; | |
1501 | void *cb_priv; | |
1502 | unsigned int refcnt; | |
1503 | }; | |
1504 | ||
1505 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
1506 | { | |
1507 | return block_cb->cb_priv; | |
1508 | } | |
1509 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
1510 | ||
1511 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
1512 | tc_setup_cb_t *cb, void *cb_ident) | |
1513 | { struct tcf_block_cb *block_cb; | |
1514 | ||
1515 | list_for_each_entry(block_cb, &block->cb_list, list) | |
1516 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
1517 | return block_cb; | |
1518 | return NULL; | |
1519 | } | |
1520 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
1521 | ||
1522 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
1523 | { | |
1524 | block_cb->refcnt++; | |
1525 | } | |
1526 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
1527 | ||
1528 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
1529 | { | |
1530 | return --block_cb->refcnt; | |
1531 | } | |
1532 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
1533 | ||
32636742 JH |
1534 | static int |
1535 | tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb, | |
1536 | void *cb_priv, bool add, bool offload_in_use, | |
1537 | struct netlink_ext_ack *extack) | |
1538 | { | |
bbf73830 | 1539 | struct tcf_chain *chain, *chain_prev; |
fe2923af | 1540 | struct tcf_proto *tp, *tp_prev; |
32636742 JH |
1541 | int err; |
1542 | ||
bbf73830 VB |
1543 | for (chain = __tcf_get_next_chain(block, NULL); |
1544 | chain; | |
1545 | chain_prev = chain, | |
1546 | chain = __tcf_get_next_chain(block, chain), | |
1547 | tcf_chain_put(chain_prev)) { | |
fe2923af VB |
1548 | for (tp = __tcf_get_next_proto(chain, NULL); tp; |
1549 | tp_prev = tp, | |
1550 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 1551 | tcf_proto_put(tp_prev, true, NULL)) { |
32636742 JH |
1552 | if (tp->ops->reoffload) { |
1553 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
1554 | extack); | |
1555 | if (err && add) | |
1556 | goto err_playback_remove; | |
1557 | } else if (add && offload_in_use) { | |
1558 | err = -EOPNOTSUPP; | |
1559 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
1560 | goto err_playback_remove; | |
1561 | } | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | return 0; | |
1566 | ||
1567 | err_playback_remove: | |
12db03b6 | 1568 | tcf_proto_put(tp, true, NULL); |
bbf73830 | 1569 | tcf_chain_put(chain); |
32636742 JH |
1570 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, |
1571 | extack); | |
1572 | return err; | |
1573 | } | |
1574 | ||
acb67442 JP |
1575 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, |
1576 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 JH |
1577 | void *cb_priv, |
1578 | struct netlink_ext_ack *extack) | |
acb67442 JP |
1579 | { |
1580 | struct tcf_block_cb *block_cb; | |
32636742 | 1581 | int err; |
acb67442 | 1582 | |
32636742 JH |
1583 | /* Replay any already present rules */ |
1584 | err = tcf_block_playback_offloads(block, cb, cb_priv, true, | |
1585 | tcf_block_offload_in_use(block), | |
1586 | extack); | |
1587 | if (err) | |
1588 | return ERR_PTR(err); | |
caa72601 | 1589 | |
acb67442 JP |
1590 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); |
1591 | if (!block_cb) | |
caa72601 | 1592 | return ERR_PTR(-ENOMEM); |
acb67442 JP |
1593 | block_cb->cb = cb; |
1594 | block_cb->cb_ident = cb_ident; | |
1595 | block_cb->cb_priv = cb_priv; | |
1596 | list_add(&block_cb->list, &block->cb_list); | |
1597 | return block_cb; | |
1598 | } | |
1599 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
1600 | ||
1601 | int tcf_block_cb_register(struct tcf_block *block, | |
1602 | tc_setup_cb_t *cb, void *cb_ident, | |
60513bd8 | 1603 | void *cb_priv, struct netlink_ext_ack *extack) |
acb67442 JP |
1604 | { |
1605 | struct tcf_block_cb *block_cb; | |
1606 | ||
60513bd8 JH |
1607 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv, |
1608 | extack); | |
baa2d2b1 | 1609 | return PTR_ERR_OR_ZERO(block_cb); |
acb67442 JP |
1610 | } |
1611 | EXPORT_SYMBOL(tcf_block_cb_register); | |
1612 | ||
32636742 JH |
1613 | void __tcf_block_cb_unregister(struct tcf_block *block, |
1614 | struct tcf_block_cb *block_cb) | |
acb67442 | 1615 | { |
32636742 JH |
1616 | tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv, |
1617 | false, tcf_block_offload_in_use(block), | |
1618 | NULL); | |
acb67442 JP |
1619 | list_del(&block_cb->list); |
1620 | kfree(block_cb); | |
1621 | } | |
1622 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
1623 | ||
1624 | void tcf_block_cb_unregister(struct tcf_block *block, | |
1625 | tc_setup_cb_t *cb, void *cb_ident) | |
1626 | { | |
1627 | struct tcf_block_cb *block_cb; | |
1628 | ||
1629 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
1630 | if (!block_cb) | |
1631 | return; | |
32636742 | 1632 | __tcf_block_cb_unregister(block, block_cb); |
acb67442 JP |
1633 | } |
1634 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
1635 | ||
87d83093 JP |
1636 | /* Main classifier routine: scans classifier chain attached |
1637 | * to this qdisc, (optionally) tests for protocol and asks | |
1638 | * specific classifiers. | |
1639 | */ | |
1640 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
1641 | struct tcf_result *res, bool compat_mode) | |
1642 | { | |
87d83093 JP |
1643 | #ifdef CONFIG_NET_CLS_ACT |
1644 | const int max_reclassify_loop = 4; | |
ee538dce JP |
1645 | const struct tcf_proto *orig_tp = tp; |
1646 | const struct tcf_proto *first_tp; | |
87d83093 JP |
1647 | int limit = 0; |
1648 | ||
1649 | reclassify: | |
1650 | #endif | |
1651 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
cd0c4e70 | 1652 | __be16 protocol = tc_skb_protocol(skb); |
87d83093 JP |
1653 | int err; |
1654 | ||
1655 | if (tp->protocol != protocol && | |
1656 | tp->protocol != htons(ETH_P_ALL)) | |
1657 | continue; | |
1658 | ||
1659 | err = tp->classify(skb, tp, res); | |
1660 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 1661 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 1662 | first_tp = orig_tp; |
87d83093 | 1663 | goto reset; |
db50514f | 1664 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 1665 | first_tp = res->goto_tp; |
db50514f JP |
1666 | goto reset; |
1667 | } | |
87d83093 JP |
1668 | #endif |
1669 | if (err >= 0) | |
1670 | return err; | |
1671 | } | |
1672 | ||
1673 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
1674 | #ifdef CONFIG_NET_CLS_ACT | |
1675 | reset: | |
1676 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
1677 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
1678 | tp->chain->block->index, | |
1679 | tp->prio & 0xffff, | |
87d83093 JP |
1680 | ntohs(tp->protocol)); |
1681 | return TC_ACT_SHOT; | |
1682 | } | |
1683 | ||
ee538dce | 1684 | tp = first_tp; |
87d83093 JP |
1685 | goto reclassify; |
1686 | #endif | |
1687 | } | |
1688 | EXPORT_SYMBOL(tcf_classify); | |
1689 | ||
2190d1d0 JP |
1690 | struct tcf_chain_info { |
1691 | struct tcf_proto __rcu **pprev; | |
1692 | struct tcf_proto __rcu *next; | |
1693 | }; | |
1694 | ||
ed76f5ed VB |
1695 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain, |
1696 | struct tcf_chain_info *chain_info) | |
2190d1d0 | 1697 | { |
ed76f5ed | 1698 | return tcf_chain_dereference(*chain_info->pprev, chain); |
2190d1d0 JP |
1699 | } |
1700 | ||
726d0612 VB |
1701 | static int tcf_chain_tp_insert(struct tcf_chain *chain, |
1702 | struct tcf_chain_info *chain_info, | |
1703 | struct tcf_proto *tp) | |
2190d1d0 | 1704 | { |
726d0612 VB |
1705 | if (chain->flushing) |
1706 | return -EAGAIN; | |
1707 | ||
c7eb7d72 | 1708 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1709 | tcf_chain0_head_change(chain, tp); |
4dbfa766 | 1710 | tcf_proto_get(tp); |
ed76f5ed | 1711 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info)); |
2190d1d0 | 1712 | rcu_assign_pointer(*chain_info->pprev, tp); |
726d0612 VB |
1713 | |
1714 | return 0; | |
2190d1d0 JP |
1715 | } |
1716 | ||
1717 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1718 | struct tcf_chain_info *chain_info, | |
1719 | struct tcf_proto *tp) | |
1720 | { | |
ed76f5ed | 1721 | struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain); |
2190d1d0 | 1722 | |
8b64678e | 1723 | tcf_proto_mark_delete(tp); |
c7eb7d72 | 1724 | if (tp == chain->filter_chain) |
f71e0ca4 | 1725 | tcf_chain0_head_change(chain, next); |
2190d1d0 JP |
1726 | RCU_INIT_POINTER(*chain_info->pprev, next); |
1727 | } | |
1728 | ||
8b64678e VB |
1729 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1730 | struct tcf_chain_info *chain_info, | |
1731 | u32 protocol, u32 prio, | |
1732 | bool prio_allocate); | |
1733 | ||
1734 | /* Try to insert new proto. | |
1735 | * If proto with specified priority already exists, free new proto | |
1736 | * and return existing one. | |
1737 | */ | |
1738 | ||
1739 | static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain, | |
1740 | struct tcf_proto *tp_new, | |
12db03b6 VB |
1741 | u32 protocol, u32 prio, |
1742 | bool rtnl_held) | |
8b64678e VB |
1743 | { |
1744 | struct tcf_chain_info chain_info; | |
1745 | struct tcf_proto *tp; | |
726d0612 | 1746 | int err = 0; |
8b64678e VB |
1747 | |
1748 | mutex_lock(&chain->filter_chain_lock); | |
1749 | ||
1750 | tp = tcf_chain_tp_find(chain, &chain_info, | |
1751 | protocol, prio, false); | |
1752 | if (!tp) | |
726d0612 | 1753 | err = tcf_chain_tp_insert(chain, &chain_info, tp_new); |
8b64678e VB |
1754 | mutex_unlock(&chain->filter_chain_lock); |
1755 | ||
1756 | if (tp) { | |
12db03b6 | 1757 | tcf_proto_destroy(tp_new, rtnl_held, NULL); |
8b64678e | 1758 | tp_new = tp; |
726d0612 | 1759 | } else if (err) { |
12db03b6 | 1760 | tcf_proto_destroy(tp_new, rtnl_held, NULL); |
726d0612 | 1761 | tp_new = ERR_PTR(err); |
8b64678e VB |
1762 | } |
1763 | ||
1764 | return tp_new; | |
1765 | } | |
1766 | ||
1767 | static void tcf_chain_tp_delete_empty(struct tcf_chain *chain, | |
12db03b6 | 1768 | struct tcf_proto *tp, bool rtnl_held, |
8b64678e VB |
1769 | struct netlink_ext_ack *extack) |
1770 | { | |
1771 | struct tcf_chain_info chain_info; | |
1772 | struct tcf_proto *tp_iter; | |
1773 | struct tcf_proto **pprev; | |
1774 | struct tcf_proto *next; | |
1775 | ||
1776 | mutex_lock(&chain->filter_chain_lock); | |
1777 | ||
1778 | /* Atomically find and remove tp from chain. */ | |
1779 | for (pprev = &chain->filter_chain; | |
1780 | (tp_iter = tcf_chain_dereference(*pprev, chain)); | |
1781 | pprev = &tp_iter->next) { | |
1782 | if (tp_iter == tp) { | |
1783 | chain_info.pprev = pprev; | |
1784 | chain_info.next = tp_iter->next; | |
1785 | WARN_ON(tp_iter->deleting); | |
1786 | break; | |
1787 | } | |
1788 | } | |
1789 | /* Verify that tp still exists and no new filters were inserted | |
1790 | * concurrently. | |
1791 | * Mark tp for deletion if it is empty. | |
1792 | */ | |
12db03b6 | 1793 | if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) { |
8b64678e VB |
1794 | mutex_unlock(&chain->filter_chain_lock); |
1795 | return; | |
1796 | } | |
1797 | ||
1798 | next = tcf_chain_dereference(chain_info.next, chain); | |
1799 | if (tp == chain->filter_chain) | |
1800 | tcf_chain0_head_change(chain, next); | |
1801 | RCU_INIT_POINTER(*chain_info.pprev, next); | |
1802 | mutex_unlock(&chain->filter_chain_lock); | |
1803 | ||
12db03b6 | 1804 | tcf_proto_put(tp, rtnl_held, extack); |
8b64678e VB |
1805 | } |
1806 | ||
2190d1d0 JP |
1807 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1808 | struct tcf_chain_info *chain_info, | |
1809 | u32 protocol, u32 prio, | |
1810 | bool prio_allocate) | |
1811 | { | |
1812 | struct tcf_proto **pprev; | |
1813 | struct tcf_proto *tp; | |
1814 | ||
1815 | /* Check the chain for existence of proto-tcf with this priority */ | |
1816 | for (pprev = &chain->filter_chain; | |
ed76f5ed VB |
1817 | (tp = tcf_chain_dereference(*pprev, chain)); |
1818 | pprev = &tp->next) { | |
2190d1d0 JP |
1819 | if (tp->prio >= prio) { |
1820 | if (tp->prio == prio) { | |
1821 | if (prio_allocate || | |
1822 | (tp->protocol != protocol && protocol)) | |
1823 | return ERR_PTR(-EINVAL); | |
1824 | } else { | |
1825 | tp = NULL; | |
1826 | } | |
1827 | break; | |
1828 | } | |
1829 | } | |
1830 | chain_info->pprev = pprev; | |
4dbfa766 VB |
1831 | if (tp) { |
1832 | chain_info->next = tp->next; | |
1833 | tcf_proto_get(tp); | |
1834 | } else { | |
1835 | chain_info->next = NULL; | |
1836 | } | |
2190d1d0 JP |
1837 | return tp; |
1838 | } | |
1839 | ||
7120371c | 1840 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1841 | struct tcf_proto *tp, struct tcf_block *block, |
1842 | struct Qdisc *q, u32 parent, void *fh, | |
12db03b6 VB |
1843 | u32 portid, u32 seq, u16 flags, int event, |
1844 | bool rtnl_held) | |
7120371c WC |
1845 | { |
1846 | struct tcmsg *tcm; | |
1847 | struct nlmsghdr *nlh; | |
1848 | unsigned char *b = skb_tail_pointer(skb); | |
1849 | ||
1850 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1851 | if (!nlh) | |
1852 | goto out_nlmsg_trim; | |
1853 | tcm = nlmsg_data(nlh); | |
1854 | tcm->tcm_family = AF_UNSPEC; | |
1855 | tcm->tcm__pad1 = 0; | |
1856 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1857 | if (q) { |
1858 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1859 | tcm->tcm_parent = parent; | |
1860 | } else { | |
1861 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1862 | tcm->tcm_block_index = block->index; | |
1863 | } | |
7120371c WC |
1864 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1865 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1866 | goto nla_put_failure; | |
1867 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1868 | goto nla_put_failure; | |
1869 | if (!fh) { | |
1870 | tcm->tcm_handle = 0; | |
1871 | } else { | |
12db03b6 VB |
1872 | if (tp->ops->dump && |
1873 | tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0) | |
7120371c WC |
1874 | goto nla_put_failure; |
1875 | } | |
1876 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1877 | return skb->len; | |
1878 | ||
1879 | out_nlmsg_trim: | |
1880 | nla_put_failure: | |
1881 | nlmsg_trim(skb, b); | |
1882 | return -1; | |
1883 | } | |
1884 | ||
1885 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1886 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1887 | struct tcf_block *block, struct Qdisc *q, |
12db03b6 VB |
1888 | u32 parent, void *fh, int event, bool unicast, |
1889 | bool rtnl_held) | |
7120371c WC |
1890 | { |
1891 | struct sk_buff *skb; | |
1892 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1893 | int err = 0; |
7120371c WC |
1894 | |
1895 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1896 | if (!skb) | |
1897 | return -ENOBUFS; | |
1898 | ||
7960d1da | 1899 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1900 | n->nlmsg_seq, n->nlmsg_flags, event, |
1901 | rtnl_held) <= 0) { | |
7120371c WC |
1902 | kfree_skb(skb); |
1903 | return -EINVAL; | |
1904 | } | |
1905 | ||
1906 | if (unicast) | |
5b5f99b1 ZW |
1907 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1908 | else | |
1909 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1910 | n->nlmsg_flags & NLM_F_ECHO); | |
7120371c | 1911 | |
5b5f99b1 ZW |
1912 | if (err > 0) |
1913 | err = 0; | |
1914 | return err; | |
7120371c WC |
1915 | } |
1916 | ||
1917 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1918 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1919 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc | 1920 | u32 parent, void *fh, bool unicast, bool *last, |
12db03b6 | 1921 | bool rtnl_held, struct netlink_ext_ack *extack) |
7120371c WC |
1922 | { |
1923 | struct sk_buff *skb; | |
1924 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1925 | int err; | |
1926 | ||
1927 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1928 | if (!skb) | |
1929 | return -ENOBUFS; | |
1930 | ||
7960d1da | 1931 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1932 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER, |
1933 | rtnl_held) <= 0) { | |
c35a4acc | 1934 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1935 | kfree_skb(skb); |
1936 | return -EINVAL; | |
1937 | } | |
1938 | ||
12db03b6 | 1939 | err = tp->ops->delete(tp, fh, last, rtnl_held, extack); |
7120371c WC |
1940 | if (err) { |
1941 | kfree_skb(skb); | |
1942 | return err; | |
1943 | } | |
1944 | ||
1945 | if (unicast) | |
5b5f99b1 ZW |
1946 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1947 | else | |
1948 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1949 | n->nlmsg_flags & NLM_F_ECHO); | |
c35a4acc AA |
1950 | if (err < 0) |
1951 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
5b5f99b1 ZW |
1952 | |
1953 | if (err > 0) | |
1954 | err = 0; | |
c35a4acc | 1955 | return err; |
7120371c WC |
1956 | } |
1957 | ||
1958 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1959 | struct tcf_block *block, struct Qdisc *q, |
1960 | u32 parent, struct nlmsghdr *n, | |
12db03b6 VB |
1961 | struct tcf_chain *chain, int event, |
1962 | bool rtnl_held) | |
7120371c WC |
1963 | { |
1964 | struct tcf_proto *tp; | |
1965 | ||
12db03b6 VB |
1966 | for (tp = tcf_get_next_proto(chain, NULL, rtnl_held); |
1967 | tp; tp = tcf_get_next_proto(chain, tp, rtnl_held)) | |
7960d1da | 1968 | tfilter_notify(net, oskb, n, tp, block, |
12db03b6 | 1969 | q, parent, NULL, event, false, rtnl_held); |
7120371c WC |
1970 | } |
1971 | ||
7d5509fa VB |
1972 | static void tfilter_put(struct tcf_proto *tp, void *fh) |
1973 | { | |
1974 | if (tp->ops->put && fh) | |
1975 | tp->ops->put(tp, fh); | |
1976 | } | |
1977 | ||
c431f89b | 1978 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1979 | struct netlink_ext_ack *extack) |
1da177e4 | 1980 | { |
3b1e0a65 | 1981 | struct net *net = sock_net(skb->sk); |
add93b61 | 1982 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1983 | struct tcmsg *t; |
1984 | u32 protocol; | |
1985 | u32 prio; | |
9d36d9e5 | 1986 | bool prio_allocate; |
1da177e4 | 1987 | u32 parent; |
5bc17018 | 1988 | u32 chain_index; |
7960d1da | 1989 | struct Qdisc *q = NULL; |
2190d1d0 | 1990 | struct tcf_chain_info chain_info; |
5bc17018 | 1991 | struct tcf_chain *chain = NULL; |
6529eaba | 1992 | struct tcf_block *block; |
1da177e4 | 1993 | struct tcf_proto *tp; |
1da177e4 | 1994 | unsigned long cl; |
8113c095 | 1995 | void *fh; |
1da177e4 | 1996 | int err; |
628185cf | 1997 | int tp_created; |
470502de | 1998 | bool rtnl_held = false; |
1da177e4 | 1999 | |
c431f89b | 2000 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 2001 | return -EPERM; |
de179c8c | 2002 | |
1da177e4 | 2003 | replay: |
628185cf DB |
2004 | tp_created = 0; |
2005 | ||
8cb08174 JB |
2006 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2007 | rtm_tca_policy, extack); | |
de179c8c H |
2008 | if (err < 0) |
2009 | return err; | |
2010 | ||
942b8165 | 2011 | t = nlmsg_data(n); |
1da177e4 LT |
2012 | protocol = TC_H_MIN(t->tcm_info); |
2013 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 2014 | prio_allocate = false; |
1da177e4 | 2015 | parent = t->tcm_parent; |
4dbfa766 | 2016 | tp = NULL; |
1da177e4 | 2017 | cl = 0; |
470502de | 2018 | block = NULL; |
1da177e4 LT |
2019 | |
2020 | if (prio == 0) { | |
c431f89b VB |
2021 | /* If no priority is provided by the user, |
2022 | * we allocate one. | |
2023 | */ | |
2024 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
2025 | prio = TC_H_MAKE(0x80000000U, 0U); | |
2026 | prio_allocate = true; | |
2027 | } else { | |
c35a4acc | 2028 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 2029 | return -ENOENT; |
ea7f8277 | 2030 | } |
1da177e4 LT |
2031 | } |
2032 | ||
2033 | /* Find head of filter chain. */ | |
2034 | ||
470502de VB |
2035 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2036 | if (err) | |
2037 | return err; | |
2038 | ||
2039 | /* Take rtnl mutex if rtnl_held was set to true on previous iteration, | |
2040 | * block is shared (no qdisc found), qdisc is not unlocked, classifier | |
2041 | * type is not specified, classifier is not unlocked. | |
2042 | */ | |
2043 | if (rtnl_held || | |
2044 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2045 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2046 | rtnl_held = true; | |
2047 | rtnl_lock(); | |
2048 | } | |
2049 | ||
2050 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2051 | if (err) | |
2052 | goto errout; | |
2053 | ||
2054 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2055 | extack); | |
c431f89b VB |
2056 | if (IS_ERR(block)) { |
2057 | err = PTR_ERR(block); | |
2058 | goto errout; | |
6bb16e7a | 2059 | } |
5bc17018 JP |
2060 | |
2061 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2062 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 2063 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
2064 | err = -EINVAL; |
2065 | goto errout; | |
2066 | } | |
c431f89b | 2067 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 2068 | if (!chain) { |
d5ed72a5 | 2069 | NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
c431f89b | 2070 | err = -ENOMEM; |
ea7f8277 DB |
2071 | goto errout; |
2072 | } | |
1da177e4 | 2073 | |
ed76f5ed | 2074 | mutex_lock(&chain->filter_chain_lock); |
2190d1d0 JP |
2075 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2076 | prio, prio_allocate); | |
2077 | if (IS_ERR(tp)) { | |
c35a4acc | 2078 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 | 2079 | err = PTR_ERR(tp); |
ed76f5ed | 2080 | goto errout_locked; |
1da177e4 LT |
2081 | } |
2082 | ||
2083 | if (tp == NULL) { | |
8b64678e VB |
2084 | struct tcf_proto *tp_new = NULL; |
2085 | ||
726d0612 VB |
2086 | if (chain->flushing) { |
2087 | err = -EAGAIN; | |
2088 | goto errout_locked; | |
2089 | } | |
2090 | ||
1da177e4 LT |
2091 | /* Proto-tcf does not exist, create new one */ |
2092 | ||
6bb16e7a | 2093 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 2094 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 2095 | err = -EINVAL; |
ed76f5ed | 2096 | goto errout_locked; |
6bb16e7a | 2097 | } |
1da177e4 | 2098 | |
c431f89b | 2099 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2100 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2101 | err = -ENOENT; |
ed76f5ed | 2102 | goto errout_locked; |
6bb16e7a | 2103 | } |
1da177e4 | 2104 | |
9d36d9e5 | 2105 | if (prio_allocate) |
ed76f5ed VB |
2106 | prio = tcf_auto_prio(tcf_chain_tp_prev(chain, |
2107 | &chain_info)); | |
1da177e4 | 2108 | |
ed76f5ed | 2109 | mutex_unlock(&chain->filter_chain_lock); |
8b64678e | 2110 | tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]), |
12db03b6 VB |
2111 | protocol, prio, chain, rtnl_held, |
2112 | extack); | |
8b64678e VB |
2113 | if (IS_ERR(tp_new)) { |
2114 | err = PTR_ERR(tp_new); | |
726d0612 | 2115 | goto errout_tp; |
1da177e4 | 2116 | } |
ed76f5ed | 2117 | |
12186be7 | 2118 | tp_created = 1; |
12db03b6 VB |
2119 | tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio, |
2120 | rtnl_held); | |
726d0612 VB |
2121 | if (IS_ERR(tp)) { |
2122 | err = PTR_ERR(tp); | |
2123 | goto errout_tp; | |
2124 | } | |
ed76f5ed VB |
2125 | } else { |
2126 | mutex_unlock(&chain->filter_chain_lock); | |
6bb16e7a | 2127 | } |
1da177e4 | 2128 | |
8b64678e VB |
2129 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2130 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2131 | err = -EINVAL; | |
2132 | goto errout; | |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | fh = tp->ops->get(tp, t->tcm_handle); |
2136 | ||
8113c095 | 2137 | if (!fh) { |
c431f89b | 2138 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2139 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2140 | err = -ENOENT; |
1da177e4 | 2141 | goto errout; |
6bb16e7a | 2142 | } |
c431f89b | 2143 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
7d5509fa | 2144 | tfilter_put(tp, fh); |
c431f89b VB |
2145 | NL_SET_ERR_MSG(extack, "Filter already exists"); |
2146 | err = -EEXIST; | |
2147 | goto errout; | |
1da177e4 LT |
2148 | } |
2149 | ||
9f407f17 JP |
2150 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
2151 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
2152 | err = -EINVAL; | |
2153 | goto errout; | |
2154 | } | |
2155 | ||
2f7ef2f8 | 2156 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 | 2157 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
12db03b6 | 2158 | rtnl_held, extack); |
7d5509fa | 2159 | if (err == 0) { |
7960d1da | 2160 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2161 | RTM_NEWTFILTER, false, rtnl_held); |
7d5509fa VB |
2162 | tfilter_put(tp, fh); |
2163 | } | |
1da177e4 LT |
2164 | |
2165 | errout: | |
8b64678e | 2166 | if (err && tp_created) |
12db03b6 | 2167 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL); |
726d0612 | 2168 | errout_tp: |
4dbfa766 VB |
2169 | if (chain) { |
2170 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2171 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 VB |
2172 | if (!tp_created) |
2173 | tcf_chain_put(chain); | |
2174 | } | |
12db03b6 | 2175 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2176 | |
2177 | if (rtnl_held) | |
2178 | rtnl_unlock(); | |
2179 | ||
2180 | if (err == -EAGAIN) { | |
2181 | /* Take rtnl lock in case EAGAIN is caused by concurrent flush | |
2182 | * of target chain. | |
2183 | */ | |
2184 | rtnl_held = true; | |
1da177e4 LT |
2185 | /* Replay the request. */ |
2186 | goto replay; | |
470502de | 2187 | } |
1da177e4 | 2188 | return err; |
ed76f5ed VB |
2189 | |
2190 | errout_locked: | |
2191 | mutex_unlock(&chain->filter_chain_lock); | |
2192 | goto errout; | |
1da177e4 LT |
2193 | } |
2194 | ||
c431f89b VB |
2195 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
2196 | struct netlink_ext_ack *extack) | |
2197 | { | |
2198 | struct net *net = sock_net(skb->sk); | |
2199 | struct nlattr *tca[TCA_MAX + 1]; | |
2200 | struct tcmsg *t; | |
2201 | u32 protocol; | |
2202 | u32 prio; | |
2203 | u32 parent; | |
2204 | u32 chain_index; | |
2205 | struct Qdisc *q = NULL; | |
2206 | struct tcf_chain_info chain_info; | |
2207 | struct tcf_chain *chain = NULL; | |
470502de | 2208 | struct tcf_block *block = NULL; |
c431f89b VB |
2209 | struct tcf_proto *tp = NULL; |
2210 | unsigned long cl = 0; | |
2211 | void *fh = NULL; | |
2212 | int err; | |
470502de | 2213 | bool rtnl_held = false; |
c431f89b VB |
2214 | |
2215 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2216 | return -EPERM; | |
2217 | ||
8cb08174 JB |
2218 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2219 | rtm_tca_policy, extack); | |
c431f89b VB |
2220 | if (err < 0) |
2221 | return err; | |
2222 | ||
2223 | t = nlmsg_data(n); | |
2224 | protocol = TC_H_MIN(t->tcm_info); | |
2225 | prio = TC_H_MAJ(t->tcm_info); | |
2226 | parent = t->tcm_parent; | |
2227 | ||
2228 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
2229 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
2230 | return -ENOENT; | |
2231 | } | |
2232 | ||
2233 | /* Find head of filter chain. */ | |
2234 | ||
470502de VB |
2235 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2236 | if (err) | |
2237 | return err; | |
2238 | ||
2239 | /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc | |
2240 | * found), qdisc is not unlocked, classifier type is not specified, | |
2241 | * classifier is not unlocked. | |
2242 | */ | |
2243 | if (!prio || | |
2244 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2245 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2246 | rtnl_held = true; | |
2247 | rtnl_lock(); | |
2248 | } | |
2249 | ||
2250 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2251 | if (err) | |
2252 | goto errout; | |
2253 | ||
2254 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2255 | extack); | |
c431f89b VB |
2256 | if (IS_ERR(block)) { |
2257 | err = PTR_ERR(block); | |
2258 | goto errout; | |
2259 | } | |
2260 | ||
2261 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2262 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2263 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2264 | err = -EINVAL; | |
2265 | goto errout; | |
2266 | } | |
2267 | chain = tcf_chain_get(block, chain_index, false); | |
2268 | if (!chain) { | |
5ca8a25c JP |
2269 | /* User requested flush on non-existent chain. Nothing to do, |
2270 | * so just return success. | |
2271 | */ | |
2272 | if (prio == 0) { | |
2273 | err = 0; | |
2274 | goto errout; | |
2275 | } | |
c431f89b | 2276 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
b7b4247d | 2277 | err = -ENOENT; |
c431f89b VB |
2278 | goto errout; |
2279 | } | |
2280 | ||
2281 | if (prio == 0) { | |
2282 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
12db03b6 VB |
2283 | chain, RTM_DELTFILTER, rtnl_held); |
2284 | tcf_chain_flush(chain, rtnl_held); | |
c431f89b VB |
2285 | err = 0; |
2286 | goto errout; | |
2287 | } | |
2288 | ||
ed76f5ed | 2289 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2290 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2291 | prio, false); | |
2292 | if (!tp || IS_ERR(tp)) { | |
2293 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2294 | err = tp ? PTR_ERR(tp) : -ENOENT; |
ed76f5ed | 2295 | goto errout_locked; |
c431f89b VB |
2296 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2297 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2298 | err = -EINVAL; | |
ed76f5ed VB |
2299 | goto errout_locked; |
2300 | } else if (t->tcm_handle == 0) { | |
2301 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
2302 | mutex_unlock(&chain->filter_chain_lock); | |
2303 | ||
12db03b6 | 2304 | tcf_proto_put(tp, rtnl_held, NULL); |
ed76f5ed | 2305 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2306 | RTM_DELTFILTER, false, rtnl_held); |
ed76f5ed | 2307 | err = 0; |
c431f89b VB |
2308 | goto errout; |
2309 | } | |
ed76f5ed | 2310 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2311 | |
2312 | fh = tp->ops->get(tp, t->tcm_handle); | |
2313 | ||
2314 | if (!fh) { | |
ed76f5ed VB |
2315 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); |
2316 | err = -ENOENT; | |
c431f89b VB |
2317 | } else { |
2318 | bool last; | |
2319 | ||
2320 | err = tfilter_del_notify(net, skb, n, tp, block, | |
2321 | q, parent, fh, false, &last, | |
12db03b6 VB |
2322 | rtnl_held, extack); |
2323 | ||
c431f89b VB |
2324 | if (err) |
2325 | goto errout; | |
8b64678e | 2326 | if (last) |
12db03b6 | 2327 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack); |
c431f89b VB |
2328 | } |
2329 | ||
2330 | errout: | |
4dbfa766 VB |
2331 | if (chain) { |
2332 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2333 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2334 | tcf_chain_put(chain); |
4dbfa766 | 2335 | } |
12db03b6 | 2336 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2337 | |
2338 | if (rtnl_held) | |
2339 | rtnl_unlock(); | |
2340 | ||
c431f89b | 2341 | return err; |
ed76f5ed VB |
2342 | |
2343 | errout_locked: | |
2344 | mutex_unlock(&chain->filter_chain_lock); | |
2345 | goto errout; | |
c431f89b VB |
2346 | } |
2347 | ||
2348 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
2349 | struct netlink_ext_ack *extack) | |
2350 | { | |
2351 | struct net *net = sock_net(skb->sk); | |
2352 | struct nlattr *tca[TCA_MAX + 1]; | |
2353 | struct tcmsg *t; | |
2354 | u32 protocol; | |
2355 | u32 prio; | |
2356 | u32 parent; | |
2357 | u32 chain_index; | |
2358 | struct Qdisc *q = NULL; | |
2359 | struct tcf_chain_info chain_info; | |
2360 | struct tcf_chain *chain = NULL; | |
470502de | 2361 | struct tcf_block *block = NULL; |
c431f89b VB |
2362 | struct tcf_proto *tp = NULL; |
2363 | unsigned long cl = 0; | |
2364 | void *fh = NULL; | |
2365 | int err; | |
470502de | 2366 | bool rtnl_held = false; |
c431f89b | 2367 | |
8cb08174 JB |
2368 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2369 | rtm_tca_policy, extack); | |
c431f89b VB |
2370 | if (err < 0) |
2371 | return err; | |
2372 | ||
2373 | t = nlmsg_data(n); | |
2374 | protocol = TC_H_MIN(t->tcm_info); | |
2375 | prio = TC_H_MAJ(t->tcm_info); | |
2376 | parent = t->tcm_parent; | |
2377 | ||
2378 | if (prio == 0) { | |
2379 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
2380 | return -ENOENT; | |
2381 | } | |
2382 | ||
2383 | /* Find head of filter chain. */ | |
2384 | ||
470502de VB |
2385 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2386 | if (err) | |
2387 | return err; | |
2388 | ||
2389 | /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not | |
2390 | * unlocked, classifier type is not specified, classifier is not | |
2391 | * unlocked. | |
2392 | */ | |
2393 | if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2394 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2395 | rtnl_held = true; | |
2396 | rtnl_lock(); | |
2397 | } | |
2398 | ||
2399 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2400 | if (err) | |
2401 | goto errout; | |
2402 | ||
2403 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2404 | extack); | |
c431f89b VB |
2405 | if (IS_ERR(block)) { |
2406 | err = PTR_ERR(block); | |
2407 | goto errout; | |
2408 | } | |
2409 | ||
2410 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2411 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2412 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2413 | err = -EINVAL; | |
2414 | goto errout; | |
2415 | } | |
2416 | chain = tcf_chain_get(block, chain_index, false); | |
2417 | if (!chain) { | |
2418 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
2419 | err = -EINVAL; | |
2420 | goto errout; | |
2421 | } | |
2422 | ||
ed76f5ed | 2423 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2424 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2425 | prio, false); | |
ed76f5ed | 2426 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2427 | if (!tp || IS_ERR(tp)) { |
2428 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2429 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
2430 | goto errout; |
2431 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
2432 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2433 | err = -EINVAL; | |
2434 | goto errout; | |
2435 | } | |
2436 | ||
2437 | fh = tp->ops->get(tp, t->tcm_handle); | |
2438 | ||
2439 | if (!fh) { | |
2440 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
2441 | err = -ENOENT; | |
2442 | } else { | |
2443 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
12db03b6 | 2444 | fh, RTM_NEWTFILTER, true, rtnl_held); |
c431f89b VB |
2445 | if (err < 0) |
2446 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
2447 | } | |
2448 | ||
7d5509fa | 2449 | tfilter_put(tp, fh); |
c431f89b | 2450 | errout: |
4dbfa766 VB |
2451 | if (chain) { |
2452 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2453 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2454 | tcf_chain_put(chain); |
4dbfa766 | 2455 | } |
12db03b6 | 2456 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2457 | |
2458 | if (rtnl_held) | |
2459 | rtnl_unlock(); | |
2460 | ||
c431f89b VB |
2461 | return err; |
2462 | } | |
2463 | ||
aa767bfe | 2464 | struct tcf_dump_args { |
1da177e4 LT |
2465 | struct tcf_walker w; |
2466 | struct sk_buff *skb; | |
2467 | struct netlink_callback *cb; | |
7960d1da | 2468 | struct tcf_block *block; |
a10fa201 JP |
2469 | struct Qdisc *q; |
2470 | u32 parent; | |
1da177e4 LT |
2471 | }; |
2472 | ||
8113c095 | 2473 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 2474 | { |
aa767bfe | 2475 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 2476 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 2477 | |
7960d1da | 2478 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 2479 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 | 2480 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
12db03b6 | 2481 | RTM_NEWTFILTER, true); |
1da177e4 LT |
2482 | } |
2483 | ||
a10fa201 JP |
2484 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
2485 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
2486 | long index_start, long *p_index) |
2487 | { | |
2488 | struct net *net = sock_net(skb->sk); | |
7960d1da | 2489 | struct tcf_block *block = chain->block; |
acb31fae | 2490 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
fe2923af | 2491 | struct tcf_proto *tp, *tp_prev; |
acb31fae | 2492 | struct tcf_dump_args arg; |
acb31fae | 2493 | |
fe2923af VB |
2494 | for (tp = __tcf_get_next_proto(chain, NULL); |
2495 | tp; | |
2496 | tp_prev = tp, | |
2497 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 2498 | tcf_proto_put(tp_prev, true, NULL), |
fe2923af | 2499 | (*p_index)++) { |
acb31fae JP |
2500 | if (*p_index < index_start) |
2501 | continue; | |
2502 | if (TC_H_MAJ(tcm->tcm_info) && | |
2503 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
2504 | continue; | |
2505 | if (TC_H_MIN(tcm->tcm_info) && | |
2506 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
2507 | continue; | |
2508 | if (*p_index > index_start) | |
2509 | memset(&cb->args[1], 0, | |
2510 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2511 | if (cb->args[1] == 0) { | |
53189183 | 2512 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
2513 | NETLINK_CB(cb->skb).portid, |
2514 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
12db03b6 | 2515 | RTM_NEWTFILTER, true) <= 0) |
fe2923af | 2516 | goto errout; |
acb31fae JP |
2517 | cb->args[1] = 1; |
2518 | } | |
2519 | if (!tp->ops->walk) | |
2520 | continue; | |
2521 | arg.w.fn = tcf_node_dump; | |
2522 | arg.skb = skb; | |
2523 | arg.cb = cb; | |
7960d1da | 2524 | arg.block = block; |
a10fa201 JP |
2525 | arg.q = q; |
2526 | arg.parent = parent; | |
acb31fae JP |
2527 | arg.w.stop = 0; |
2528 | arg.w.skip = cb->args[1] - 1; | |
2529 | arg.w.count = 0; | |
01683a14 | 2530 | arg.w.cookie = cb->args[2]; |
12db03b6 | 2531 | tp->ops->walk(tp, &arg.w, true); |
01683a14 | 2532 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
2533 | cb->args[1] = arg.w.count + 1; |
2534 | if (arg.w.stop) | |
fe2923af | 2535 | goto errout; |
acb31fae | 2536 | } |
5bc17018 | 2537 | return true; |
fe2923af VB |
2538 | |
2539 | errout: | |
12db03b6 | 2540 | tcf_proto_put(tp, true, NULL); |
fe2923af | 2541 | return false; |
acb31fae JP |
2542 | } |
2543 | ||
bd27a875 | 2544 | /* called with RTNL */ |
1da177e4 LT |
2545 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
2546 | { | |
bbf73830 | 2547 | struct tcf_chain *chain, *chain_prev; |
3b1e0a65 | 2548 | struct net *net = sock_net(skb->sk); |
5bc17018 | 2549 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 2550 | struct Qdisc *q = NULL; |
6529eaba | 2551 | struct tcf_block *block; |
942b8165 | 2552 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
2553 | long index_start; |
2554 | long index; | |
a10fa201 | 2555 | u32 parent; |
5bc17018 | 2556 | int err; |
1da177e4 | 2557 | |
573ce260 | 2558 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2559 | return skb->len; |
5bc17018 | 2560 | |
8cb08174 JB |
2561 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2562 | NULL, cb->extack); | |
5bc17018 JP |
2563 | if (err) |
2564 | return err; | |
2565 | ||
7960d1da | 2566 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
787ce6d0 | 2567 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
7960d1da JP |
2568 | if (!block) |
2569 | goto out; | |
d680b352 JP |
2570 | /* If we work with block index, q is NULL and parent value |
2571 | * will never be used in the following code. The check | |
2572 | * in tcf_fill_node prevents it. However, compiler does not | |
2573 | * see that far, so set parent to zero to silence the warning | |
2574 | * about parent being uninitialized. | |
2575 | */ | |
2576 | parent = 0; | |
a10fa201 | 2577 | } else { |
7960d1da JP |
2578 | const struct Qdisc_class_ops *cops; |
2579 | struct net_device *dev; | |
2580 | unsigned long cl = 0; | |
2581 | ||
2582 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2583 | if (!dev) | |
2584 | return skb->len; | |
2585 | ||
2586 | parent = tcm->tcm_parent; | |
2587 | if (!parent) { | |
2588 | q = dev->qdisc; | |
2589 | parent = q->handle; | |
2590 | } else { | |
2591 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2592 | } | |
2593 | if (!q) | |
2594 | goto out; | |
2595 | cops = q->ops->cl_ops; | |
2596 | if (!cops) | |
143976ce | 2597 | goto out; |
7960d1da JP |
2598 | if (!cops->tcf_block) |
2599 | goto out; | |
2600 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2601 | cl = cops->find(q, tcm->tcm_parent); | |
2602 | if (cl == 0) | |
2603 | goto out; | |
2604 | } | |
2605 | block = cops->tcf_block(q, cl, NULL); | |
2606 | if (!block) | |
2607 | goto out; | |
2608 | if (tcf_block_shared(block)) | |
2609 | q = NULL; | |
1da177e4 | 2610 | } |
1da177e4 | 2611 | |
acb31fae JP |
2612 | index_start = cb->args[0]; |
2613 | index = 0; | |
5bc17018 | 2614 | |
bbf73830 VB |
2615 | for (chain = __tcf_get_next_chain(block, NULL); |
2616 | chain; | |
2617 | chain_prev = chain, | |
2618 | chain = __tcf_get_next_chain(block, chain), | |
2619 | tcf_chain_put(chain_prev)) { | |
5bc17018 JP |
2620 | if (tca[TCA_CHAIN] && |
2621 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
2622 | continue; | |
a10fa201 | 2623 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad | 2624 | index_start, &index)) { |
bbf73830 | 2625 | tcf_chain_put(chain); |
5ae437ad | 2626 | err = -EMSGSIZE; |
5bc17018 | 2627 | break; |
5ae437ad | 2628 | } |
5bc17018 JP |
2629 | } |
2630 | ||
787ce6d0 | 2631 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 2632 | tcf_block_refcnt_put(block, true); |
acb31fae | 2633 | cb->args[0] = index; |
1da177e4 | 2634 | |
1da177e4 | 2635 | out: |
5ae437ad RK |
2636 | /* If we did no progress, the error (EMSGSIZE) is real */ |
2637 | if (skb->len == 0 && err) | |
2638 | return err; | |
1da177e4 LT |
2639 | return skb->len; |
2640 | } | |
2641 | ||
a5654820 VB |
2642 | static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, |
2643 | void *tmplt_priv, u32 chain_index, | |
2644 | struct net *net, struct sk_buff *skb, | |
2645 | struct tcf_block *block, | |
32a4f5ec JP |
2646 | u32 portid, u32 seq, u16 flags, int event) |
2647 | { | |
2648 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 2649 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
2650 | struct nlmsghdr *nlh; |
2651 | struct tcmsg *tcm; | |
9f407f17 JP |
2652 | void *priv; |
2653 | ||
a5654820 VB |
2654 | ops = tmplt_ops; |
2655 | priv = tmplt_priv; | |
32a4f5ec JP |
2656 | |
2657 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
2658 | if (!nlh) | |
2659 | goto out_nlmsg_trim; | |
2660 | tcm = nlmsg_data(nlh); | |
2661 | tcm->tcm_family = AF_UNSPEC; | |
2662 | tcm->tcm__pad1 = 0; | |
2663 | tcm->tcm__pad2 = 0; | |
2664 | tcm->tcm_handle = 0; | |
2665 | if (block->q) { | |
2666 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
2667 | tcm->tcm_parent = block->q->handle; | |
2668 | } else { | |
2669 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
2670 | tcm->tcm_block_index = block->index; | |
2671 | } | |
2672 | ||
a5654820 | 2673 | if (nla_put_u32(skb, TCA_CHAIN, chain_index)) |
32a4f5ec JP |
2674 | goto nla_put_failure; |
2675 | ||
9f407f17 JP |
2676 | if (ops) { |
2677 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
2678 | goto nla_put_failure; | |
2679 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
2680 | goto nla_put_failure; | |
2681 | } | |
2682 | ||
32a4f5ec JP |
2683 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
2684 | return skb->len; | |
2685 | ||
2686 | out_nlmsg_trim: | |
2687 | nla_put_failure: | |
2688 | nlmsg_trim(skb, b); | |
2689 | return -EMSGSIZE; | |
2690 | } | |
2691 | ||
2692 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
2693 | u32 seq, u16 flags, int event, bool unicast) | |
2694 | { | |
2695 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2696 | struct tcf_block *block = chain->block; | |
2697 | struct net *net = block->net; | |
2698 | struct sk_buff *skb; | |
5b5f99b1 | 2699 | int err = 0; |
32a4f5ec JP |
2700 | |
2701 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2702 | if (!skb) | |
2703 | return -ENOBUFS; | |
2704 | ||
a5654820 VB |
2705 | if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
2706 | chain->index, net, skb, block, portid, | |
32a4f5ec JP |
2707 | seq, flags, event) <= 0) { |
2708 | kfree_skb(skb); | |
2709 | return -EINVAL; | |
2710 | } | |
2711 | ||
2712 | if (unicast) | |
5b5f99b1 ZW |
2713 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
2714 | else | |
2715 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
2716 | flags & NLM_F_ECHO); | |
32a4f5ec | 2717 | |
5b5f99b1 ZW |
2718 | if (err > 0) |
2719 | err = 0; | |
2720 | return err; | |
32a4f5ec JP |
2721 | } |
2722 | ||
a5654820 VB |
2723 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, |
2724 | void *tmplt_priv, u32 chain_index, | |
2725 | struct tcf_block *block, struct sk_buff *oskb, | |
2726 | u32 seq, u16 flags, bool unicast) | |
2727 | { | |
2728 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2729 | struct net *net = block->net; | |
2730 | struct sk_buff *skb; | |
2731 | ||
2732 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2733 | if (!skb) | |
2734 | return -ENOBUFS; | |
2735 | ||
2736 | if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb, | |
2737 | block, portid, seq, flags, RTM_DELCHAIN) <= 0) { | |
2738 | kfree_skb(skb); | |
2739 | return -EINVAL; | |
2740 | } | |
2741 | ||
2742 | if (unicast) | |
2743 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
2744 | ||
2745 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
2746 | } | |
2747 | ||
9f407f17 JP |
2748 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
2749 | struct nlattr **tca, | |
2750 | struct netlink_ext_ack *extack) | |
2751 | { | |
2752 | const struct tcf_proto_ops *ops; | |
2753 | void *tmplt_priv; | |
2754 | ||
2755 | /* If kind is not set, user did not specify template. */ | |
2756 | if (!tca[TCA_KIND]) | |
2757 | return 0; | |
2758 | ||
12db03b6 | 2759 | ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack); |
9f407f17 JP |
2760 | if (IS_ERR(ops)) |
2761 | return PTR_ERR(ops); | |
2762 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
2763 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
2764 | return -EOPNOTSUPP; | |
2765 | } | |
2766 | ||
2767 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
2768 | if (IS_ERR(tmplt_priv)) { | |
2769 | module_put(ops->owner); | |
2770 | return PTR_ERR(tmplt_priv); | |
2771 | } | |
2772 | chain->tmplt_ops = ops; | |
2773 | chain->tmplt_priv = tmplt_priv; | |
2774 | return 0; | |
2775 | } | |
2776 | ||
a5654820 VB |
2777 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
2778 | void *tmplt_priv) | |
9f407f17 | 2779 | { |
9f407f17 | 2780 | /* If template ops are set, no work to do for us. */ |
a5654820 | 2781 | if (!tmplt_ops) |
9f407f17 JP |
2782 | return; |
2783 | ||
a5654820 VB |
2784 | tmplt_ops->tmplt_destroy(tmplt_priv); |
2785 | module_put(tmplt_ops->owner); | |
9f407f17 JP |
2786 | } |
2787 | ||
32a4f5ec JP |
2788 | /* Add/delete/get a chain */ |
2789 | ||
2790 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
2791 | struct netlink_ext_ack *extack) | |
2792 | { | |
2793 | struct net *net = sock_net(skb->sk); | |
2794 | struct nlattr *tca[TCA_MAX + 1]; | |
2795 | struct tcmsg *t; | |
2796 | u32 parent; | |
2797 | u32 chain_index; | |
2798 | struct Qdisc *q = NULL; | |
2799 | struct tcf_chain *chain = NULL; | |
2800 | struct tcf_block *block; | |
2801 | unsigned long cl; | |
2802 | int err; | |
2803 | ||
2804 | if (n->nlmsg_type != RTM_GETCHAIN && | |
2805 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2806 | return -EPERM; | |
2807 | ||
2808 | replay: | |
8cb08174 JB |
2809 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2810 | rtm_tca_policy, extack); | |
32a4f5ec JP |
2811 | if (err < 0) |
2812 | return err; | |
2813 | ||
2814 | t = nlmsg_data(n); | |
2815 | parent = t->tcm_parent; | |
2816 | cl = 0; | |
2817 | ||
2818 | block = tcf_block_find(net, &q, &parent, &cl, | |
2819 | t->tcm_ifindex, t->tcm_block_index, extack); | |
2820 | if (IS_ERR(block)) | |
2821 | return PTR_ERR(block); | |
2822 | ||
2823 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2824 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2825 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
e368fdb6 VB |
2826 | err = -EINVAL; |
2827 | goto errout_block; | |
32a4f5ec | 2828 | } |
2cbfab07 VB |
2829 | |
2830 | mutex_lock(&block->lock); | |
32a4f5ec JP |
2831 | chain = tcf_chain_lookup(block, chain_index); |
2832 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
2833 | if (chain) { | |
3d32f4c5 | 2834 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 2835 | /* The chain exists only because there is |
3d32f4c5 | 2836 | * some action referencing it. |
1f3ed383 JP |
2837 | */ |
2838 | tcf_chain_hold(chain); | |
2839 | } else { | |
2840 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
e368fdb6 | 2841 | err = -EEXIST; |
2cbfab07 | 2842 | goto errout_block_locked; |
1f3ed383 JP |
2843 | } |
2844 | } else { | |
2845 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
2846 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
e368fdb6 | 2847 | err = -ENOENT; |
2cbfab07 | 2848 | goto errout_block_locked; |
1f3ed383 JP |
2849 | } |
2850 | chain = tcf_chain_create(block, chain_index); | |
2851 | if (!chain) { | |
2852 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
e368fdb6 | 2853 | err = -ENOMEM; |
2cbfab07 | 2854 | goto errout_block_locked; |
1f3ed383 | 2855 | } |
32a4f5ec JP |
2856 | } |
2857 | } else { | |
3d32f4c5 | 2858 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec | 2859 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
e368fdb6 | 2860 | err = -EINVAL; |
2cbfab07 | 2861 | goto errout_block_locked; |
32a4f5ec JP |
2862 | } |
2863 | tcf_chain_hold(chain); | |
2864 | } | |
2865 | ||
2cbfab07 VB |
2866 | if (n->nlmsg_type == RTM_NEWCHAIN) { |
2867 | /* Modifying chain requires holding parent block lock. In case | |
2868 | * the chain was successfully added, take a reference to the | |
2869 | * chain. This ensures that an empty chain does not disappear at | |
2870 | * the end of this function. | |
2871 | */ | |
2872 | tcf_chain_hold(chain); | |
2873 | chain->explicitly_created = true; | |
2874 | } | |
2875 | mutex_unlock(&block->lock); | |
2876 | ||
32a4f5ec JP |
2877 | switch (n->nlmsg_type) { |
2878 | case RTM_NEWCHAIN: | |
9f407f17 | 2879 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
2cbfab07 VB |
2880 | if (err) { |
2881 | tcf_chain_put_explicitly_created(chain); | |
9f407f17 | 2882 | goto errout; |
2cbfab07 VB |
2883 | } |
2884 | ||
32a4f5ec JP |
2885 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
2886 | RTM_NEWCHAIN, false); | |
2887 | break; | |
2888 | case RTM_DELCHAIN: | |
f5b9bac7 | 2889 | tfilter_notify_chain(net, skb, block, q, parent, n, |
12db03b6 | 2890 | chain, RTM_DELTFILTER, true); |
32a4f5ec | 2891 | /* Flush the chain first as the user requested chain removal. */ |
12db03b6 | 2892 | tcf_chain_flush(chain, true); |
32a4f5ec JP |
2893 | /* In case the chain was successfully deleted, put a reference |
2894 | * to the chain previously taken during addition. | |
2895 | */ | |
2896 | tcf_chain_put_explicitly_created(chain); | |
2897 | break; | |
2898 | case RTM_GETCHAIN: | |
32a4f5ec JP |
2899 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
2900 | n->nlmsg_seq, n->nlmsg_type, true); | |
2901 | if (err < 0) | |
2902 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
2903 | break; | |
2904 | default: | |
2905 | err = -EOPNOTSUPP; | |
2906 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
2907 | goto errout; | |
2908 | } | |
2909 | ||
2910 | errout: | |
2911 | tcf_chain_put(chain); | |
e368fdb6 | 2912 | errout_block: |
12db03b6 | 2913 | tcf_block_release(q, block, true); |
32a4f5ec JP |
2914 | if (err == -EAGAIN) |
2915 | /* Replay the request. */ | |
2916 | goto replay; | |
2917 | return err; | |
2cbfab07 VB |
2918 | |
2919 | errout_block_locked: | |
2920 | mutex_unlock(&block->lock); | |
2921 | goto errout_block; | |
32a4f5ec JP |
2922 | } |
2923 | ||
2924 | /* called with RTNL */ | |
2925 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
2926 | { | |
2927 | struct net *net = sock_net(skb->sk); | |
2928 | struct nlattr *tca[TCA_MAX + 1]; | |
2929 | struct Qdisc *q = NULL; | |
2930 | struct tcf_block *block; | |
32a4f5ec | 2931 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
ace4a267 | 2932 | struct tcf_chain *chain; |
32a4f5ec JP |
2933 | long index_start; |
2934 | long index; | |
2935 | u32 parent; | |
2936 | int err; | |
2937 | ||
2938 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
2939 | return skb->len; | |
2940 | ||
8cb08174 JB |
2941 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2942 | rtm_tca_policy, cb->extack); | |
32a4f5ec JP |
2943 | if (err) |
2944 | return err; | |
2945 | ||
2946 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 2947 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
32a4f5ec JP |
2948 | if (!block) |
2949 | goto out; | |
2950 | /* If we work with block index, q is NULL and parent value | |
2951 | * will never be used in the following code. The check | |
2952 | * in tcf_fill_node prevents it. However, compiler does not | |
2953 | * see that far, so set parent to zero to silence the warning | |
2954 | * about parent being uninitialized. | |
2955 | */ | |
2956 | parent = 0; | |
2957 | } else { | |
2958 | const struct Qdisc_class_ops *cops; | |
2959 | struct net_device *dev; | |
2960 | unsigned long cl = 0; | |
2961 | ||
2962 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2963 | if (!dev) | |
2964 | return skb->len; | |
2965 | ||
2966 | parent = tcm->tcm_parent; | |
2967 | if (!parent) { | |
2968 | q = dev->qdisc; | |
2969 | parent = q->handle; | |
2970 | } else { | |
2971 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2972 | } | |
2973 | if (!q) | |
2974 | goto out; | |
2975 | cops = q->ops->cl_ops; | |
2976 | if (!cops) | |
2977 | goto out; | |
2978 | if (!cops->tcf_block) | |
2979 | goto out; | |
2980 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2981 | cl = cops->find(q, tcm->tcm_parent); | |
2982 | if (cl == 0) | |
2983 | goto out; | |
2984 | } | |
2985 | block = cops->tcf_block(q, cl, NULL); | |
2986 | if (!block) | |
2987 | goto out; | |
2988 | if (tcf_block_shared(block)) | |
2989 | q = NULL; | |
2990 | } | |
2991 | ||
2992 | index_start = cb->args[0]; | |
2993 | index = 0; | |
2994 | ||
ace4a267 VB |
2995 | mutex_lock(&block->lock); |
2996 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec JP |
2997 | if ((tca[TCA_CHAIN] && |
2998 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
2999 | continue; | |
3000 | if (index < index_start) { | |
3001 | index++; | |
3002 | continue; | |
3003 | } | |
ace4a267 VB |
3004 | if (tcf_chain_held_by_acts_only(chain)) |
3005 | continue; | |
a5654820 VB |
3006 | err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
3007 | chain->index, net, skb, block, | |
32a4f5ec JP |
3008 | NETLINK_CB(cb->skb).portid, |
3009 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
3010 | RTM_NEWCHAIN); | |
ace4a267 | 3011 | if (err <= 0) |
32a4f5ec JP |
3012 | break; |
3013 | index++; | |
3014 | } | |
ace4a267 | 3015 | mutex_unlock(&block->lock); |
32a4f5ec | 3016 | |
787ce6d0 | 3017 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 3018 | tcf_block_refcnt_put(block, true); |
32a4f5ec JP |
3019 | cb->args[0] = index; |
3020 | ||
3021 | out: | |
3022 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
3023 | if (skb->len == 0 && err) | |
3024 | return err; | |
3025 | return skb->len; | |
3026 | } | |
3027 | ||
18d0264f | 3028 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
3029 | { |
3030 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 3031 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
3032 | kfree(exts->actions); |
3033 | exts->nr_actions = 0; | |
1da177e4 LT |
3034 | #endif |
3035 | } | |
aa767bfe | 3036 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 3037 | |
c1b52739 | 3038 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 | 3039 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
ec6743a1 | 3040 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 3041 | { |
1da177e4 LT |
3042 | #ifdef CONFIG_NET_CLS_ACT |
3043 | { | |
1da177e4 | 3044 | struct tc_action *act; |
d04e6990 | 3045 | size_t attr_size = 0; |
1da177e4 | 3046 | |
5da57f42 | 3047 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
3048 | act = tcf_action_init_1(net, tp, tb[exts->police], |
3049 | rate_tlv, "police", ovr, | |
ec6743a1 VB |
3050 | TCA_ACT_BIND, rtnl_held, |
3051 | extack); | |
ab27cfb8 PM |
3052 | if (IS_ERR(act)) |
3053 | return PTR_ERR(act); | |
1da177e4 | 3054 | |
33be6271 | 3055 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
3056 | exts->actions[0] = act; |
3057 | exts->nr_actions = 1; | |
5da57f42 | 3058 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 3059 | int err; |
22dc13c8 | 3060 | |
9fb9f251 JP |
3061 | err = tcf_action_init(net, tp, tb[exts->action], |
3062 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
ec6743a1 VB |
3063 | exts->actions, &attr_size, |
3064 | rtnl_held, extack); | |
90b73b77 | 3065 | if (err < 0) |
33be6271 | 3066 | return err; |
90b73b77 | 3067 | exts->nr_actions = err; |
1da177e4 LT |
3068 | } |
3069 | } | |
1da177e4 | 3070 | #else |
5da57f42 | 3071 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
3072 | (exts->police && tb[exts->police])) { |
3073 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 3074 | return -EOPNOTSUPP; |
50a56190 | 3075 | } |
1da177e4 LT |
3076 | #endif |
3077 | ||
3078 | return 0; | |
3079 | } | |
aa767bfe | 3080 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 3081 | |
9b0d4446 | 3082 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
3083 | { |
3084 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
3085 | struct tcf_exts old = *dst; |
3086 | ||
9b0d4446 | 3087 | *dst = *src; |
22dc13c8 | 3088 | tcf_exts_destroy(&old); |
1da177e4 LT |
3089 | #endif |
3090 | } | |
aa767bfe | 3091 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 3092 | |
22dc13c8 WC |
3093 | #ifdef CONFIG_NET_CLS_ACT |
3094 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
3095 | { | |
3096 | if (exts->nr_actions == 0) | |
3097 | return NULL; | |
3098 | else | |
3099 | return exts->actions[0]; | |
3100 | } | |
3101 | #endif | |
33be6271 | 3102 | |
5da57f42 | 3103 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3104 | { |
3105 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
3106 | struct nlattr *nest; |
3107 | ||
978dfd8d | 3108 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
3109 | /* |
3110 | * again for backward compatible mode - we want | |
3111 | * to work with both old and new modes of entering | |
3112 | * tc data even if iproute2 was newer - jhs | |
3113 | */ | |
33be6271 | 3114 | if (exts->type != TCA_OLD_COMPAT) { |
ae0be8de | 3115 | nest = nla_nest_start_noflag(skb, exts->action); |
4b3550ef PM |
3116 | if (nest == NULL) |
3117 | goto nla_put_failure; | |
22dc13c8 | 3118 | |
90b73b77 | 3119 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 3120 | goto nla_put_failure; |
4b3550ef | 3121 | nla_nest_end(skb, nest); |
5da57f42 | 3122 | } else if (exts->police) { |
33be6271 | 3123 | struct tc_action *act = tcf_exts_first_act(exts); |
ae0be8de | 3124 | nest = nla_nest_start_noflag(skb, exts->police); |
63acd680 | 3125 | if (nest == NULL || !act) |
4b3550ef | 3126 | goto nla_put_failure; |
33be6271 | 3127 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 3128 | goto nla_put_failure; |
4b3550ef | 3129 | nla_nest_end(skb, nest); |
1da177e4 LT |
3130 | } |
3131 | } | |
1da177e4 | 3132 | return 0; |
9cc63db5 CW |
3133 | |
3134 | nla_put_failure: | |
3135 | nla_nest_cancel(skb, nest); | |
1da177e4 | 3136 | return -1; |
9cc63db5 CW |
3137 | #else |
3138 | return 0; | |
3139 | #endif | |
1da177e4 | 3140 | } |
aa767bfe | 3141 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 3142 | |
aa767bfe | 3143 | |
5da57f42 | 3144 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3145 | { |
3146 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 3147 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 3148 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 3149 | return -1; |
1da177e4 LT |
3150 | #endif |
3151 | return 0; | |
1da177e4 | 3152 | } |
aa767bfe | 3153 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 3154 | |
aeb3fecd CW |
3155 | int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, |
3156 | void *type_data, bool err_stop) | |
717503b9 | 3157 | { |
aeb3fecd CW |
3158 | struct tcf_block_cb *block_cb; |
3159 | int ok_count = 0; | |
3160 | int err; | |
3161 | ||
3162 | /* Make sure all netdevs sharing this block are offload-capable. */ | |
3163 | if (block->nooffloaddevcnt && err_stop) | |
3164 | return -EOPNOTSUPP; | |
3165 | ||
3166 | list_for_each_entry(block_cb, &block->cb_list, list) { | |
3167 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
3168 | if (err) { | |
3169 | if (err_stop) | |
3170 | return err; | |
3171 | } else { | |
3172 | ok_count++; | |
3173 | } | |
3174 | } | |
3175 | return ok_count; | |
717503b9 JP |
3176 | } |
3177 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 3178 | |
3a7b6861 PNA |
3179 | int tc_setup_flow_action(struct flow_action *flow_action, |
3180 | const struct tcf_exts *exts) | |
3181 | { | |
3182 | const struct tc_action *act; | |
3183 | int i, j, k; | |
3184 | ||
3185 | if (!exts) | |
3186 | return 0; | |
3187 | ||
3188 | j = 0; | |
3189 | tcf_exts_for_each_action(i, act, exts) { | |
3190 | struct flow_action_entry *entry; | |
3191 | ||
3192 | entry = &flow_action->entries[j]; | |
3193 | if (is_tcf_gact_ok(act)) { | |
3194 | entry->id = FLOW_ACTION_ACCEPT; | |
3195 | } else if (is_tcf_gact_shot(act)) { | |
3196 | entry->id = FLOW_ACTION_DROP; | |
3197 | } else if (is_tcf_gact_trap(act)) { | |
3198 | entry->id = FLOW_ACTION_TRAP; | |
3199 | } else if (is_tcf_gact_goto_chain(act)) { | |
3200 | entry->id = FLOW_ACTION_GOTO; | |
3201 | entry->chain_index = tcf_gact_goto_chain_index(act); | |
3202 | } else if (is_tcf_mirred_egress_redirect(act)) { | |
3203 | entry->id = FLOW_ACTION_REDIRECT; | |
3204 | entry->dev = tcf_mirred_dev(act); | |
3205 | } else if (is_tcf_mirred_egress_mirror(act)) { | |
3206 | entry->id = FLOW_ACTION_MIRRED; | |
3207 | entry->dev = tcf_mirred_dev(act); | |
3208 | } else if (is_tcf_vlan(act)) { | |
3209 | switch (tcf_vlan_action(act)) { | |
3210 | case TCA_VLAN_ACT_PUSH: | |
3211 | entry->id = FLOW_ACTION_VLAN_PUSH; | |
3212 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3213 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3214 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3215 | break; | |
3216 | case TCA_VLAN_ACT_POP: | |
3217 | entry->id = FLOW_ACTION_VLAN_POP; | |
3218 | break; | |
3219 | case TCA_VLAN_ACT_MODIFY: | |
3220 | entry->id = FLOW_ACTION_VLAN_MANGLE; | |
3221 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3222 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3223 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3224 | break; | |
3225 | default: | |
3226 | goto err_out; | |
3227 | } | |
3228 | } else if (is_tcf_tunnel_set(act)) { | |
3229 | entry->id = FLOW_ACTION_TUNNEL_ENCAP; | |
3230 | entry->tunnel = tcf_tunnel_info(act); | |
3231 | } else if (is_tcf_tunnel_release(act)) { | |
3232 | entry->id = FLOW_ACTION_TUNNEL_DECAP; | |
3a7b6861 PNA |
3233 | } else if (is_tcf_pedit(act)) { |
3234 | for (k = 0; k < tcf_pedit_nkeys(act); k++) { | |
3235 | switch (tcf_pedit_cmd(act, k)) { | |
3236 | case TCA_PEDIT_KEY_EX_CMD_SET: | |
3237 | entry->id = FLOW_ACTION_MANGLE; | |
3238 | break; | |
3239 | case TCA_PEDIT_KEY_EX_CMD_ADD: | |
3240 | entry->id = FLOW_ACTION_ADD; | |
3241 | break; | |
3242 | default: | |
3243 | goto err_out; | |
3244 | } | |
3245 | entry->mangle.htype = tcf_pedit_htype(act, k); | |
3246 | entry->mangle.mask = tcf_pedit_mask(act, k); | |
3247 | entry->mangle.val = tcf_pedit_val(act, k); | |
3248 | entry->mangle.offset = tcf_pedit_offset(act, k); | |
3249 | entry = &flow_action->entries[++j]; | |
3250 | } | |
3251 | } else if (is_tcf_csum(act)) { | |
3252 | entry->id = FLOW_ACTION_CSUM; | |
3253 | entry->csum_flags = tcf_csum_update_flags(act); | |
3254 | } else if (is_tcf_skbedit_mark(act)) { | |
3255 | entry->id = FLOW_ACTION_MARK; | |
3256 | entry->mark = tcf_skbedit_mark(act); | |
a7a7be60 PJV |
3257 | } else if (is_tcf_sample(act)) { |
3258 | entry->id = FLOW_ACTION_SAMPLE; | |
3259 | entry->sample.psample_group = | |
3260 | tcf_sample_psample_group(act); | |
3261 | entry->sample.trunc_size = tcf_sample_trunc_size(act); | |
3262 | entry->sample.truncate = tcf_sample_truncate(act); | |
3263 | entry->sample.rate = tcf_sample_rate(act); | |
8c8cfc6e PJV |
3264 | } else if (is_tcf_police(act)) { |
3265 | entry->id = FLOW_ACTION_POLICE; | |
3266 | entry->police.burst = tcf_police_tcfp_burst(act); | |
3267 | entry->police.rate_bytes_ps = | |
3268 | tcf_police_rate_bytes_ps(act); | |
3a7b6861 PNA |
3269 | } else { |
3270 | goto err_out; | |
3271 | } | |
3272 | ||
3273 | if (!is_tcf_pedit(act)) | |
3274 | j++; | |
3275 | } | |
3276 | return 0; | |
3277 | err_out: | |
3278 | return -EOPNOTSUPP; | |
3279 | } | |
3280 | EXPORT_SYMBOL(tc_setup_flow_action); | |
3281 | ||
e3ab786b PNA |
3282 | unsigned int tcf_exts_num_actions(struct tcf_exts *exts) |
3283 | { | |
3284 | unsigned int num_acts = 0; | |
3285 | struct tc_action *act; | |
3286 | int i; | |
3287 | ||
3288 | tcf_exts_for_each_action(i, act, exts) { | |
3289 | if (is_tcf_pedit(act)) | |
3290 | num_acts += tcf_pedit_nkeys(act); | |
3291 | else | |
3292 | num_acts++; | |
3293 | } | |
3294 | return num_acts; | |
3295 | } | |
3296 | EXPORT_SYMBOL(tcf_exts_num_actions); | |
3297 | ||
48617387 JP |
3298 | static __net_init int tcf_net_init(struct net *net) |
3299 | { | |
3300 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3301 | ||
ab281629 | 3302 | spin_lock_init(&tn->idr_lock); |
48617387 JP |
3303 | idr_init(&tn->idr); |
3304 | return 0; | |
3305 | } | |
3306 | ||
3307 | static void __net_exit tcf_net_exit(struct net *net) | |
3308 | { | |
3309 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3310 | ||
3311 | idr_destroy(&tn->idr); | |
3312 | } | |
3313 | ||
3314 | static struct pernet_operations tcf_net_ops = { | |
3315 | .init = tcf_net_init, | |
3316 | .exit = tcf_net_exit, | |
3317 | .id = &tcf_net_id, | |
3318 | .size = sizeof(struct tcf_net), | |
3319 | }; | |
3320 | ||
1da177e4 LT |
3321 | static int __init tc_filter_init(void) |
3322 | { | |
48617387 JP |
3323 | int err; |
3324 | ||
7aa0045d CW |
3325 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
3326 | if (!tc_filter_wq) | |
3327 | return -ENOMEM; | |
3328 | ||
48617387 JP |
3329 | err = register_pernet_subsys(&tcf_net_ops); |
3330 | if (err) | |
3331 | goto err_register_pernet_subsys; | |
3332 | ||
7f76fa36 JH |
3333 | err = rhashtable_init(&indr_setup_block_ht, |
3334 | &tc_indr_setup_block_ht_params); | |
3335 | if (err) | |
3336 | goto err_rhash_setup_block_ht; | |
3337 | ||
470502de VB |
3338 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, |
3339 | RTNL_FLAG_DOIT_UNLOCKED); | |
3340 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, | |
3341 | RTNL_FLAG_DOIT_UNLOCKED); | |
c431f89b | 3342 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, |
470502de | 3343 | tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED); |
32a4f5ec JP |
3344 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
3345 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
3346 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
3347 | tc_dump_chain, 0); | |
1da177e4 | 3348 | |
1da177e4 | 3349 | return 0; |
48617387 | 3350 | |
7f76fa36 JH |
3351 | err_rhash_setup_block_ht: |
3352 | unregister_pernet_subsys(&tcf_net_ops); | |
48617387 JP |
3353 | err_register_pernet_subsys: |
3354 | destroy_workqueue(tc_filter_wq); | |
3355 | return err; | |
1da177e4 LT |
3356 | } |
3357 | ||
3358 | subsys_initcall(tc_filter_init); |