Commit | Line | Data |
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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> |
59eb87cb | 24 | #include <linux/jhash.h> |
b854272b DL |
25 | #include <net/net_namespace.h> |
26 | #include <net/sock.h> | |
dc5fc579 | 27 | #include <net/netlink.h> |
1da177e4 LT |
28 | #include <net/pkt_sched.h> |
29 | #include <net/pkt_cls.h> | |
e3ab786b | 30 | #include <net/tc_act/tc_pedit.h> |
3a7b6861 PNA |
31 | #include <net/tc_act/tc_mirred.h> |
32 | #include <net/tc_act/tc_vlan.h> | |
33 | #include <net/tc_act/tc_tunnel_key.h> | |
34 | #include <net/tc_act/tc_csum.h> | |
35 | #include <net/tc_act/tc_gact.h> | |
8c8cfc6e | 36 | #include <net/tc_act/tc_police.h> |
a7a7be60 | 37 | #include <net/tc_act/tc_sample.h> |
3a7b6861 | 38 | #include <net/tc_act/tc_skbedit.h> |
b57dc7c1 | 39 | #include <net/tc_act/tc_ct.h> |
6749d590 | 40 | #include <net/tc_act/tc_mpls.h> |
4e481908 | 41 | #include <net/flow_offload.h> |
1da177e4 | 42 | |
e331473f DC |
43 | extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; |
44 | ||
1da177e4 | 45 | /* The list of all installed classifier types */ |
36272874 | 46 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
47 | |
48 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
49 | static DEFINE_RWLOCK(cls_mod_lock); | |
50 | ||
59eb87cb JH |
51 | static u32 destroy_obj_hashfn(const struct tcf_proto *tp) |
52 | { | |
53 | return jhash_3words(tp->chain->index, tp->prio, | |
54 | (__force __u32)tp->protocol, 0); | |
55 | } | |
56 | ||
57 | static void tcf_proto_signal_destroying(struct tcf_chain *chain, | |
58 | struct tcf_proto *tp) | |
59 | { | |
60 | struct tcf_block *block = chain->block; | |
61 | ||
62 | mutex_lock(&block->proto_destroy_lock); | |
63 | hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node, | |
64 | destroy_obj_hashfn(tp)); | |
65 | mutex_unlock(&block->proto_destroy_lock); | |
66 | } | |
67 | ||
68 | static bool tcf_proto_cmp(const struct tcf_proto *tp1, | |
69 | const struct tcf_proto *tp2) | |
70 | { | |
71 | return tp1->chain->index == tp2->chain->index && | |
72 | tp1->prio == tp2->prio && | |
73 | tp1->protocol == tp2->protocol; | |
74 | } | |
75 | ||
76 | static bool tcf_proto_exists_destroying(struct tcf_chain *chain, | |
77 | struct tcf_proto *tp) | |
78 | { | |
79 | u32 hash = destroy_obj_hashfn(tp); | |
80 | struct tcf_proto *iter; | |
81 | bool found = false; | |
82 | ||
83 | rcu_read_lock(); | |
84 | hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter, | |
85 | destroy_ht_node, hash) { | |
86 | if (tcf_proto_cmp(tp, iter)) { | |
87 | found = true; | |
88 | break; | |
89 | } | |
90 | } | |
91 | rcu_read_unlock(); | |
92 | ||
93 | return found; | |
94 | } | |
95 | ||
96 | static void | |
97 | tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp) | |
98 | { | |
99 | struct tcf_block *block = chain->block; | |
100 | ||
101 | mutex_lock(&block->proto_destroy_lock); | |
102 | if (hash_hashed(&tp->destroy_ht_node)) | |
103 | hash_del_rcu(&tp->destroy_ht_node); | |
104 | mutex_unlock(&block->proto_destroy_lock); | |
105 | } | |
106 | ||
1da177e4 LT |
107 | /* Find classifier type by string name */ |
108 | ||
f34e8bff | 109 | static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 110 | { |
dcd76081 | 111 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
112 | |
113 | if (kind) { | |
114 | read_lock(&cls_mod_lock); | |
36272874 | 115 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 116 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
117 | if (try_module_get(t->owner)) |
118 | res = t; | |
1da177e4 LT |
119 | break; |
120 | } | |
121 | } | |
122 | read_unlock(&cls_mod_lock); | |
123 | } | |
dcd76081 | 124 | return res; |
1da177e4 LT |
125 | } |
126 | ||
f34e8bff | 127 | static const struct tcf_proto_ops * |
12db03b6 VB |
128 | tcf_proto_lookup_ops(const char *kind, bool rtnl_held, |
129 | struct netlink_ext_ack *extack) | |
f34e8bff JP |
130 | { |
131 | const struct tcf_proto_ops *ops; | |
132 | ||
133 | ops = __tcf_proto_lookup_ops(kind); | |
134 | if (ops) | |
135 | return ops; | |
136 | #ifdef CONFIG_MODULES | |
12db03b6 VB |
137 | if (rtnl_held) |
138 | rtnl_unlock(); | |
f34e8bff | 139 | request_module("cls_%s", kind); |
12db03b6 VB |
140 | if (rtnl_held) |
141 | rtnl_lock(); | |
f34e8bff JP |
142 | ops = __tcf_proto_lookup_ops(kind); |
143 | /* We dropped the RTNL semaphore in order to perform | |
144 | * the module load. So, even if we succeeded in loading | |
145 | * the module we have to replay the request. We indicate | |
146 | * this using -EAGAIN. | |
147 | */ | |
148 | if (ops) { | |
149 | module_put(ops->owner); | |
150 | return ERR_PTR(-EAGAIN); | |
151 | } | |
152 | #endif | |
153 | NL_SET_ERR_MSG(extack, "TC classifier not found"); | |
154 | return ERR_PTR(-ENOENT); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* Register(unregister) new classifier type */ |
158 | ||
159 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
160 | { | |
36272874 | 161 | struct tcf_proto_ops *t; |
1da177e4 LT |
162 | int rc = -EEXIST; |
163 | ||
164 | write_lock(&cls_mod_lock); | |
36272874 | 165 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
166 | if (!strcmp(ops->kind, t->kind)) |
167 | goto out; | |
168 | ||
36272874 | 169 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
170 | rc = 0; |
171 | out: | |
172 | write_unlock(&cls_mod_lock); | |
173 | return rc; | |
174 | } | |
aa767bfe | 175 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 176 | |
7aa0045d CW |
177 | static struct workqueue_struct *tc_filter_wq; |
178 | ||
1da177e4 LT |
179 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
180 | { | |
36272874 | 181 | struct tcf_proto_ops *t; |
1da177e4 LT |
182 | int rc = -ENOENT; |
183 | ||
c78e1746 DB |
184 | /* Wait for outstanding call_rcu()s, if any, from a |
185 | * tcf_proto_ops's destroy() handler. | |
186 | */ | |
187 | rcu_barrier(); | |
7aa0045d | 188 | flush_workqueue(tc_filter_wq); |
c78e1746 | 189 | |
1da177e4 | 190 | write_lock(&cls_mod_lock); |
dcd76081 ED |
191 | list_for_each_entry(t, &tcf_proto_base, head) { |
192 | if (t == ops) { | |
193 | list_del(&t->head); | |
194 | rc = 0; | |
1da177e4 | 195 | break; |
dcd76081 ED |
196 | } |
197 | } | |
1da177e4 LT |
198 | write_unlock(&cls_mod_lock); |
199 | return rc; | |
200 | } | |
aa767bfe | 201 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 202 | |
aaa908ff | 203 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 204 | { |
aaa908ff CW |
205 | INIT_RCU_WORK(rwork, func); |
206 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
207 | } |
208 | EXPORT_SYMBOL(tcf_queue_work); | |
209 | ||
1da177e4 LT |
210 | /* Select new prio value from the range, managed by kernel. */ |
211 | ||
aa767bfe | 212 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 213 | { |
aa767bfe | 214 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
215 | |
216 | if (tp) | |
cc7ec456 | 217 | first = tp->prio - 1; |
1da177e4 | 218 | |
7961973a | 219 | return TC_H_MAJ(first); |
1da177e4 LT |
220 | } |
221 | ||
6f96c3c6 CW |
222 | static bool tcf_proto_check_kind(struct nlattr *kind, char *name) |
223 | { | |
224 | if (kind) | |
225 | return nla_strlcpy(name, kind, IFNAMSIZ) >= IFNAMSIZ; | |
226 | memset(name, 0, IFNAMSIZ); | |
227 | return false; | |
228 | } | |
229 | ||
470502de VB |
230 | static bool tcf_proto_is_unlocked(const char *kind) |
231 | { | |
232 | const struct tcf_proto_ops *ops; | |
233 | bool ret; | |
234 | ||
6f96c3c6 CW |
235 | if (strlen(kind) == 0) |
236 | return false; | |
237 | ||
470502de VB |
238 | ops = tcf_proto_lookup_ops(kind, false, NULL); |
239 | /* On error return false to take rtnl lock. Proto lookup/create | |
240 | * functions will perform lookup again and properly handle errors. | |
241 | */ | |
242 | if (IS_ERR(ops)) | |
243 | return false; | |
244 | ||
245 | ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED); | |
246 | module_put(ops->owner); | |
247 | return ret; | |
248 | } | |
249 | ||
33a48927 | 250 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc | 251 | u32 prio, struct tcf_chain *chain, |
12db03b6 | 252 | bool rtnl_held, |
c35a4acc | 253 | struct netlink_ext_ack *extack) |
33a48927 JP |
254 | { |
255 | struct tcf_proto *tp; | |
256 | int err; | |
257 | ||
258 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
259 | if (!tp) | |
260 | return ERR_PTR(-ENOBUFS); | |
261 | ||
12db03b6 | 262 | tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack); |
f34e8bff JP |
263 | if (IS_ERR(tp->ops)) { |
264 | err = PTR_ERR(tp->ops); | |
d68d75fd | 265 | goto errout; |
33a48927 JP |
266 | } |
267 | tp->classify = tp->ops->classify; | |
268 | tp->protocol = protocol; | |
269 | tp->prio = prio; | |
5bc17018 | 270 | tp->chain = chain; |
8b64678e | 271 | spin_lock_init(&tp->lock); |
4dbfa766 | 272 | refcount_set(&tp->refcnt, 1); |
33a48927 JP |
273 | |
274 | err = tp->ops->init(tp); | |
275 | if (err) { | |
276 | module_put(tp->ops->owner); | |
277 | goto errout; | |
278 | } | |
279 | return tp; | |
280 | ||
281 | errout: | |
282 | kfree(tp); | |
283 | return ERR_PTR(err); | |
284 | } | |
285 | ||
4dbfa766 VB |
286 | static void tcf_proto_get(struct tcf_proto *tp) |
287 | { | |
288 | refcount_inc(&tp->refcnt); | |
289 | } | |
290 | ||
291 | static void tcf_chain_put(struct tcf_chain *chain); | |
292 | ||
12db03b6 | 293 | static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, |
59eb87cb | 294 | bool sig_destroy, struct netlink_ext_ack *extack) |
cf1facda | 295 | { |
12db03b6 | 296 | tp->ops->destroy(tp, rtnl_held, extack); |
59eb87cb JH |
297 | if (sig_destroy) |
298 | tcf_proto_signal_destroyed(tp->chain, tp); | |
4dbfa766 | 299 | tcf_chain_put(tp->chain); |
763dbf63 WC |
300 | module_put(tp->ops->owner); |
301 | kfree_rcu(tp, rcu); | |
cf1facda JP |
302 | } |
303 | ||
12db03b6 | 304 | static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held, |
4dbfa766 VB |
305 | struct netlink_ext_ack *extack) |
306 | { | |
307 | if (refcount_dec_and_test(&tp->refcnt)) | |
59eb87cb | 308 | tcf_proto_destroy(tp, rtnl_held, true, extack); |
4dbfa766 VB |
309 | } |
310 | ||
a5b72a08 | 311 | static bool tcf_proto_check_delete(struct tcf_proto *tp) |
8b64678e | 312 | { |
a5b72a08 DC |
313 | if (tp->ops->delete_empty) |
314 | return tp->ops->delete_empty(tp); | |
8b64678e | 315 | |
a5b72a08 | 316 | tp->deleting = true; |
8b64678e VB |
317 | return tp->deleting; |
318 | } | |
319 | ||
320 | static void tcf_proto_mark_delete(struct tcf_proto *tp) | |
321 | { | |
322 | spin_lock(&tp->lock); | |
323 | tp->deleting = true; | |
324 | spin_unlock(&tp->lock); | |
325 | } | |
326 | ||
327 | static bool tcf_proto_is_deleting(struct tcf_proto *tp) | |
328 | { | |
329 | bool deleting; | |
330 | ||
331 | spin_lock(&tp->lock); | |
332 | deleting = tp->deleting; | |
333 | spin_unlock(&tp->lock); | |
334 | ||
335 | return deleting; | |
336 | } | |
337 | ||
c266f64d VB |
338 | #define ASSERT_BLOCK_LOCKED(block) \ |
339 | lockdep_assert_held(&(block)->lock) | |
340 | ||
a9b19443 JP |
341 | struct tcf_filter_chain_list_item { |
342 | struct list_head list; | |
343 | tcf_chain_head_change_t *chain_head_change; | |
344 | void *chain_head_change_priv; | |
345 | }; | |
346 | ||
5bc17018 JP |
347 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
348 | u32 chain_index) | |
2190d1d0 | 349 | { |
5bc17018 JP |
350 | struct tcf_chain *chain; |
351 | ||
c266f64d VB |
352 | ASSERT_BLOCK_LOCKED(block); |
353 | ||
5bc17018 JP |
354 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
355 | if (!chain) | |
356 | return NULL; | |
357 | list_add_tail(&chain->list, &block->chain_list); | |
ed76f5ed | 358 | mutex_init(&chain->filter_chain_lock); |
5bc17018 JP |
359 | chain->block = block; |
360 | chain->index = chain_index; | |
e2ef7544 | 361 | chain->refcnt = 1; |
f71e0ca4 JP |
362 | if (!chain->index) |
363 | block->chain0.chain = chain; | |
5bc17018 | 364 | return chain; |
2190d1d0 JP |
365 | } |
366 | ||
a9b19443 JP |
367 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
368 | struct tcf_proto *tp_head) | |
369 | { | |
370 | if (item->chain_head_change) | |
371 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
372 | } | |
f71e0ca4 JP |
373 | |
374 | static void tcf_chain0_head_change(struct tcf_chain *chain, | |
375 | struct tcf_proto *tp_head) | |
c7eb7d72 | 376 | { |
a9b19443 | 377 | struct tcf_filter_chain_list_item *item; |
f71e0ca4 | 378 | struct tcf_block *block = chain->block; |
a9b19443 | 379 | |
f71e0ca4 JP |
380 | if (chain->index) |
381 | return; | |
165f0135 VB |
382 | |
383 | mutex_lock(&block->lock); | |
f71e0ca4 | 384 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) |
a9b19443 | 385 | tcf_chain_head_change_item(item, tp_head); |
165f0135 | 386 | mutex_unlock(&block->lock); |
c7eb7d72 JP |
387 | } |
388 | ||
c266f64d VB |
389 | /* Returns true if block can be safely freed. */ |
390 | ||
391 | static bool tcf_chain_detach(struct tcf_chain *chain) | |
f93e1cdc | 392 | { |
efbf7897 CW |
393 | struct tcf_block *block = chain->block; |
394 | ||
c266f64d VB |
395 | ASSERT_BLOCK_LOCKED(block); |
396 | ||
e2ef7544 | 397 | list_del(&chain->list); |
f71e0ca4 JP |
398 | if (!chain->index) |
399 | block->chain0.chain = NULL; | |
c266f64d VB |
400 | |
401 | if (list_empty(&block->chain_list) && | |
402 | refcount_read(&block->refcnt) == 0) | |
403 | return true; | |
404 | ||
405 | return false; | |
406 | } | |
407 | ||
408 | static void tcf_block_destroy(struct tcf_block *block) | |
409 | { | |
410 | mutex_destroy(&block->lock); | |
59eb87cb | 411 | mutex_destroy(&block->proto_destroy_lock); |
c266f64d VB |
412 | kfree_rcu(block, rcu); |
413 | } | |
414 | ||
415 | static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block) | |
416 | { | |
417 | struct tcf_block *block = chain->block; | |
418 | ||
ed76f5ed | 419 | mutex_destroy(&chain->filter_chain_lock); |
ee3bbfe8 | 420 | kfree_rcu(chain, rcu); |
c266f64d VB |
421 | if (free_block) |
422 | tcf_block_destroy(block); | |
e2ef7544 | 423 | } |
744a4cf6 | 424 | |
e2ef7544 CW |
425 | static void tcf_chain_hold(struct tcf_chain *chain) |
426 | { | |
c266f64d VB |
427 | ASSERT_BLOCK_LOCKED(chain->block); |
428 | ||
e2ef7544 | 429 | ++chain->refcnt; |
2190d1d0 JP |
430 | } |
431 | ||
3d32f4c5 | 432 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 | 433 | { |
c266f64d VB |
434 | ASSERT_BLOCK_LOCKED(chain->block); |
435 | ||
1f3ed383 | 436 | /* In case all the references are action references, this |
3d32f4c5 | 437 | * chain should not be shown to the user. |
1f3ed383 JP |
438 | */ |
439 | return chain->refcnt == chain->action_refcnt; | |
440 | } | |
441 | ||
32a4f5ec JP |
442 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
443 | u32 chain_index) | |
5bc17018 JP |
444 | { |
445 | struct tcf_chain *chain; | |
446 | ||
c266f64d VB |
447 | ASSERT_BLOCK_LOCKED(block); |
448 | ||
5bc17018 | 449 | list_for_each_entry(chain, &block->chain_list, list) { |
32a4f5ec | 450 | if (chain->index == chain_index) |
e2ef7544 | 451 | return chain; |
32a4f5ec JP |
452 | } |
453 | return NULL; | |
454 | } | |
455 | ||
456 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
457 | u32 seq, u16 flags, int event, bool unicast); | |
458 | ||
53681407 JP |
459 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
460 | u32 chain_index, bool create, | |
461 | bool by_act) | |
32a4f5ec | 462 | { |
c266f64d VB |
463 | struct tcf_chain *chain = NULL; |
464 | bool is_first_reference; | |
32a4f5ec | 465 | |
c266f64d VB |
466 | mutex_lock(&block->lock); |
467 | chain = tcf_chain_lookup(block, chain_index); | |
32a4f5ec JP |
468 | if (chain) { |
469 | tcf_chain_hold(chain); | |
53681407 JP |
470 | } else { |
471 | if (!create) | |
c266f64d | 472 | goto errout; |
53681407 JP |
473 | chain = tcf_chain_create(block, chain_index); |
474 | if (!chain) | |
c266f64d | 475 | goto errout; |
5bc17018 | 476 | } |
80532384 | 477 | |
53681407 JP |
478 | if (by_act) |
479 | ++chain->action_refcnt; | |
c266f64d VB |
480 | is_first_reference = chain->refcnt - chain->action_refcnt == 1; |
481 | mutex_unlock(&block->lock); | |
53681407 JP |
482 | |
483 | /* Send notification only in case we got the first | |
484 | * non-action reference. Until then, the chain acts only as | |
485 | * a placeholder for actions pointing to it and user ought | |
486 | * not know about them. | |
487 | */ | |
c266f64d | 488 | if (is_first_reference && !by_act) |
53681407 JP |
489 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
490 | RTM_NEWCHAIN, false); | |
491 | ||
32a4f5ec | 492 | return chain; |
c266f64d VB |
493 | |
494 | errout: | |
495 | mutex_unlock(&block->lock); | |
496 | return chain; | |
5bc17018 | 497 | } |
53681407 | 498 | |
290b1c8b JP |
499 | static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
500 | bool create) | |
53681407 JP |
501 | { |
502 | return __tcf_chain_get(block, chain_index, create, false); | |
503 | } | |
5bc17018 | 504 | |
1f3ed383 JP |
505 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
506 | { | |
53681407 | 507 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
508 | } |
509 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
510 | ||
a5654820 VB |
511 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
512 | void *tmplt_priv); | |
513 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, | |
514 | void *tmplt_priv, u32 chain_index, | |
515 | struct tcf_block *block, struct sk_buff *oskb, | |
516 | u32 seq, u16 flags, bool unicast); | |
9f407f17 | 517 | |
91052fa1 VB |
518 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act, |
519 | bool explicitly_created) | |
5bc17018 | 520 | { |
c266f64d | 521 | struct tcf_block *block = chain->block; |
a5654820 | 522 | const struct tcf_proto_ops *tmplt_ops; |
b62989fc | 523 | bool free_block = false; |
c266f64d | 524 | unsigned int refcnt; |
a5654820 | 525 | void *tmplt_priv; |
c266f64d VB |
526 | |
527 | mutex_lock(&block->lock); | |
91052fa1 VB |
528 | if (explicitly_created) { |
529 | if (!chain->explicitly_created) { | |
530 | mutex_unlock(&block->lock); | |
531 | return; | |
532 | } | |
533 | chain->explicitly_created = false; | |
534 | } | |
535 | ||
53681407 JP |
536 | if (by_act) |
537 | chain->action_refcnt--; | |
c266f64d VB |
538 | |
539 | /* tc_chain_notify_delete can't be called while holding block lock. | |
540 | * However, when block is unlocked chain can be changed concurrently, so | |
541 | * save these to temporary variables. | |
542 | */ | |
543 | refcnt = --chain->refcnt; | |
a5654820 VB |
544 | tmplt_ops = chain->tmplt_ops; |
545 | tmplt_priv = chain->tmplt_priv; | |
53681407 JP |
546 | |
547 | /* The last dropped non-action reference will trigger notification. */ | |
b62989fc VB |
548 | if (refcnt - chain->action_refcnt == 0 && !by_act) { |
549 | tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index, | |
a5654820 | 550 | block, NULL, 0, 0, false); |
726d0612 VB |
551 | /* Last reference to chain, no need to lock. */ |
552 | chain->flushing = false; | |
553 | } | |
53681407 | 554 | |
b62989fc VB |
555 | if (refcnt == 0) |
556 | free_block = tcf_chain_detach(chain); | |
557 | mutex_unlock(&block->lock); | |
558 | ||
c266f64d | 559 | if (refcnt == 0) { |
a5654820 | 560 | tc_chain_tmplt_del(tmplt_ops, tmplt_priv); |
c266f64d | 561 | tcf_chain_destroy(chain, free_block); |
32a4f5ec | 562 | } |
5bc17018 | 563 | } |
53681407 | 564 | |
290b1c8b | 565 | static void tcf_chain_put(struct tcf_chain *chain) |
53681407 | 566 | { |
91052fa1 | 567 | __tcf_chain_put(chain, false, false); |
53681407 | 568 | } |
5bc17018 | 569 | |
1f3ed383 JP |
570 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
571 | { | |
91052fa1 | 572 | __tcf_chain_put(chain, true, false); |
1f3ed383 JP |
573 | } |
574 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
575 | ||
32a4f5ec JP |
576 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
577 | { | |
91052fa1 | 578 | __tcf_chain_put(chain, false, true); |
32a4f5ec JP |
579 | } |
580 | ||
12db03b6 | 581 | static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held) |
290b1c8b | 582 | { |
4dbfa766 | 583 | struct tcf_proto *tp, *tp_next; |
290b1c8b | 584 | |
ed76f5ed VB |
585 | mutex_lock(&chain->filter_chain_lock); |
586 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
59eb87cb JH |
587 | while (tp) { |
588 | tp_next = rcu_dereference_protected(tp->next, 1); | |
589 | tcf_proto_signal_destroying(chain, tp); | |
590 | tp = tp_next; | |
591 | } | |
592 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
4dbfa766 | 593 | RCU_INIT_POINTER(chain->filter_chain, NULL); |
290b1c8b | 594 | tcf_chain0_head_change(chain, NULL); |
726d0612 | 595 | chain->flushing = true; |
ed76f5ed VB |
596 | mutex_unlock(&chain->filter_chain_lock); |
597 | ||
290b1c8b | 598 | while (tp) { |
4dbfa766 | 599 | tp_next = rcu_dereference_protected(tp->next, 1); |
12db03b6 | 600 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 | 601 | tp = tp_next; |
290b1c8b JP |
602 | } |
603 | } | |
604 | ||
59094b1e PNA |
605 | static int tcf_block_setup(struct tcf_block *block, |
606 | struct flow_block_offload *bo); | |
607 | ||
25a443f7 JH |
608 | static void tc_indr_block_cmd(struct net_device *dev, struct tcf_block *block, |
609 | flow_indr_block_bind_cb_t *cb, void *cb_priv, | |
610 | enum flow_block_command command, bool ingress) | |
7f76fa36 | 611 | { |
955bcb6e | 612 | struct flow_block_offload bo = { |
7f76fa36 | 613 | .command = command, |
25a443f7 JH |
614 | .binder_type = ingress ? |
615 | FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS : | |
616 | FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS, | |
242453c2 | 617 | .net = dev_net(dev), |
618 | .block_shared = tcf_block_non_null_shared(block), | |
7f76fa36 | 619 | }; |
59094b1e | 620 | INIT_LIST_HEAD(&bo.cb_list); |
7f76fa36 | 621 | |
242453c2 | 622 | if (!block) |
7f76fa36 JH |
623 | return; |
624 | ||
242453c2 | 625 | bo.block = &block->flow_block; |
14bfb13f | 626 | |
4f8116c8 | 627 | down_write(&block->cb_lock); |
242453c2 | 628 | cb(dev, cb_priv, TC_SETUP_BLOCK, &bo); |
629 | ||
630 | tcf_block_setup(block, &bo); | |
4f8116c8 | 631 | up_write(&block->cb_lock); |
7f76fa36 JH |
632 | } |
633 | ||
25a443f7 | 634 | static struct tcf_block *tc_dev_block(struct net_device *dev, bool ingress) |
7f76fa36 | 635 | { |
4e481908 | 636 | const struct Qdisc_class_ops *cops; |
25a443f7 | 637 | const struct Qdisc_ops *ops; |
4e481908 | 638 | struct Qdisc *qdisc; |
7f76fa36 | 639 | |
4e481908 | 640 | if (!dev_ingress_queue(dev)) |
641 | return NULL; | |
7f76fa36 | 642 | |
4e481908 | 643 | qdisc = dev_ingress_queue(dev)->qdisc_sleeping; |
644 | if (!qdisc) | |
645 | return NULL; | |
7f76fa36 | 646 | |
25a443f7 JH |
647 | ops = qdisc->ops; |
648 | if (!ops) | |
649 | return NULL; | |
650 | ||
651 | if (!ingress && !strcmp("ingress", ops->id)) | |
652 | return NULL; | |
653 | ||
654 | cops = ops->cl_ops; | |
4e481908 | 655 | if (!cops) |
656 | return NULL; | |
7f76fa36 | 657 | |
4e481908 | 658 | if (!cops->tcf_block) |
659 | return NULL; | |
7f76fa36 | 660 | |
25a443f7 JH |
661 | return cops->tcf_block(qdisc, |
662 | ingress ? TC_H_MIN_INGRESS : TC_H_MIN_EGRESS, | |
663 | NULL); | |
7f76fa36 | 664 | } |
7f76fa36 | 665 | |
25a443f7 JH |
666 | static void tc_indr_block_get_and_cmd(struct net_device *dev, |
667 | flow_indr_block_bind_cb_t *cb, | |
668 | void *cb_priv, | |
669 | enum flow_block_command command) | |
e4da9102 | 670 | { |
25a443f7 JH |
671 | struct tcf_block *block; |
672 | ||
673 | block = tc_dev_block(dev, true); | |
674 | tc_indr_block_cmd(dev, block, cb, cb_priv, command, true); | |
e4da9102 | 675 | |
25a443f7 JH |
676 | block = tc_dev_block(dev, false); |
677 | tc_indr_block_cmd(dev, block, cb, cb_priv, command, false); | |
e4da9102 | 678 | } |
679 | ||
4e481908 | 680 | static void tc_indr_block_call(struct tcf_block *block, |
681 | struct net_device *dev, | |
7f76fa36 | 682 | struct tcf_block_ext_info *ei, |
9c0e189e | 683 | enum flow_block_command command, |
7f76fa36 JH |
684 | struct netlink_ext_ack *extack) |
685 | { | |
955bcb6e | 686 | struct flow_block_offload bo = { |
7f76fa36 JH |
687 | .command = command, |
688 | .binder_type = ei->binder_type, | |
da3eeb90 | 689 | .net = dev_net(dev), |
14bfb13f | 690 | .block = &block->flow_block, |
955bcb6e | 691 | .block_shared = tcf_block_shared(block), |
7f76fa36 JH |
692 | .extack = extack, |
693 | }; | |
59094b1e | 694 | INIT_LIST_HEAD(&bo.cb_list); |
7f76fa36 | 695 | |
1150ab0f | 696 | flow_indr_block_call(dev, &bo, command); |
59094b1e | 697 | tcf_block_setup(block, &bo); |
7f76fa36 JH |
698 | } |
699 | ||
caa72601 JP |
700 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
701 | { | |
97394bef | 702 | return atomic_read(&block->offloadcnt); |
caa72601 JP |
703 | } |
704 | ||
705 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
706 | struct net_device *dev, | |
707 | struct tcf_block_ext_info *ei, | |
9c0e189e | 708 | enum flow_block_command command, |
60513bd8 | 709 | struct netlink_ext_ack *extack) |
8c4083b3 | 710 | { |
955bcb6e | 711 | struct flow_block_offload bo = {}; |
59094b1e | 712 | int err; |
8c4083b3 | 713 | |
da3eeb90 | 714 | bo.net = dev_net(dev); |
8c4083b3 JP |
715 | bo.command = command; |
716 | bo.binder_type = ei->binder_type; | |
14bfb13f | 717 | bo.block = &block->flow_block; |
955bcb6e | 718 | bo.block_shared = tcf_block_shared(block); |
60513bd8 | 719 | bo.extack = extack; |
59094b1e PNA |
720 | INIT_LIST_HEAD(&bo.cb_list); |
721 | ||
722 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); | |
723 | if (err < 0) | |
724 | return err; | |
725 | ||
726 | return tcf_block_setup(block, &bo); | |
8c4083b3 JP |
727 | } |
728 | ||
caa72601 | 729 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
730 | struct tcf_block_ext_info *ei, |
731 | struct netlink_ext_ack *extack) | |
8c4083b3 | 732 | { |
caa72601 JP |
733 | struct net_device *dev = q->dev_queue->dev; |
734 | int err; | |
735 | ||
4f8116c8 | 736 | down_write(&block->cb_lock); |
caa72601 JP |
737 | if (!dev->netdev_ops->ndo_setup_tc) |
738 | goto no_offload_dev_inc; | |
739 | ||
740 | /* If tc offload feature is disabled and the block we try to bind | |
741 | * to already has some offloaded filters, forbid to bind. | |
742 | */ | |
60513bd8 JH |
743 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
744 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
4f8116c8 VB |
745 | err = -EOPNOTSUPP; |
746 | goto err_unlock; | |
60513bd8 | 747 | } |
caa72601 | 748 | |
9c0e189e | 749 | err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_BIND, extack); |
caa72601 JP |
750 | if (err == -EOPNOTSUPP) |
751 | goto no_offload_dev_inc; | |
7f76fa36 | 752 | if (err) |
4f8116c8 | 753 | goto err_unlock; |
7f76fa36 | 754 | |
9c0e189e | 755 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); |
4f8116c8 | 756 | up_write(&block->cb_lock); |
7f76fa36 | 757 | return 0; |
caa72601 JP |
758 | |
759 | no_offload_dev_inc: | |
4f8116c8 VB |
760 | if (tcf_block_offload_in_use(block)) { |
761 | err = -EOPNOTSUPP; | |
762 | goto err_unlock; | |
763 | } | |
764 | err = 0; | |
caa72601 | 765 | block->nooffloaddevcnt++; |
9c0e189e | 766 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); |
4f8116c8 VB |
767 | err_unlock: |
768 | up_write(&block->cb_lock); | |
769 | return err; | |
8c4083b3 JP |
770 | } |
771 | ||
772 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
773 | struct tcf_block_ext_info *ei) | |
774 | { | |
caa72601 JP |
775 | struct net_device *dev = q->dev_queue->dev; |
776 | int err; | |
777 | ||
4f8116c8 | 778 | down_write(&block->cb_lock); |
9c0e189e | 779 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); |
7f76fa36 | 780 | |
caa72601 JP |
781 | if (!dev->netdev_ops->ndo_setup_tc) |
782 | goto no_offload_dev_dec; | |
9c0e189e | 783 | err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); |
caa72601 JP |
784 | if (err == -EOPNOTSUPP) |
785 | goto no_offload_dev_dec; | |
4f8116c8 | 786 | up_write(&block->cb_lock); |
caa72601 JP |
787 | return; |
788 | ||
789 | no_offload_dev_dec: | |
790 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
4f8116c8 | 791 | up_write(&block->cb_lock); |
8c4083b3 JP |
792 | } |
793 | ||
a9b19443 | 794 | static int |
f71e0ca4 JP |
795 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
796 | struct tcf_block_ext_info *ei, | |
797 | struct netlink_ext_ack *extack) | |
a9b19443 JP |
798 | { |
799 | struct tcf_filter_chain_list_item *item; | |
165f0135 | 800 | struct tcf_chain *chain0; |
a9b19443 JP |
801 | |
802 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
803 | if (!item) { | |
804 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
805 | return -ENOMEM; | |
806 | } | |
807 | item->chain_head_change = ei->chain_head_change; | |
808 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
165f0135 VB |
809 | |
810 | mutex_lock(&block->lock); | |
811 | chain0 = block->chain0.chain; | |
ed76f5ed VB |
812 | if (chain0) |
813 | tcf_chain_hold(chain0); | |
814 | else | |
815 | list_add(&item->list, &block->chain0.filter_chain_list); | |
165f0135 VB |
816 | mutex_unlock(&block->lock); |
817 | ||
ed76f5ed VB |
818 | if (chain0) { |
819 | struct tcf_proto *tp_head; | |
820 | ||
821 | mutex_lock(&chain0->filter_chain_lock); | |
822 | ||
823 | tp_head = tcf_chain_dereference(chain0->filter_chain, chain0); | |
824 | if (tp_head) | |
825 | tcf_chain_head_change_item(item, tp_head); | |
826 | ||
827 | mutex_lock(&block->lock); | |
828 | list_add(&item->list, &block->chain0.filter_chain_list); | |
829 | mutex_unlock(&block->lock); | |
830 | ||
831 | mutex_unlock(&chain0->filter_chain_lock); | |
832 | tcf_chain_put(chain0); | |
833 | } | |
834 | ||
a9b19443 JP |
835 | return 0; |
836 | } | |
837 | ||
838 | static void | |
f71e0ca4 JP |
839 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
840 | struct tcf_block_ext_info *ei) | |
a9b19443 JP |
841 | { |
842 | struct tcf_filter_chain_list_item *item; | |
843 | ||
165f0135 | 844 | mutex_lock(&block->lock); |
f71e0ca4 | 845 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
846 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
847 | (item->chain_head_change == ei->chain_head_change && | |
848 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
165f0135 | 849 | if (block->chain0.chain) |
f71e0ca4 | 850 | tcf_chain_head_change_item(item, NULL); |
a9b19443 | 851 | list_del(&item->list); |
165f0135 VB |
852 | mutex_unlock(&block->lock); |
853 | ||
a9b19443 JP |
854 | kfree(item); |
855 | return; | |
856 | } | |
857 | } | |
165f0135 | 858 | mutex_unlock(&block->lock); |
a9b19443 JP |
859 | WARN_ON(1); |
860 | } | |
861 | ||
48617387 | 862 | struct tcf_net { |
ab281629 | 863 | spinlock_t idr_lock; /* Protects idr */ |
48617387 JP |
864 | struct idr idr; |
865 | }; | |
866 | ||
867 | static unsigned int tcf_net_id; | |
868 | ||
869 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 870 | struct netlink_ext_ack *extack) |
a9b19443 | 871 | { |
48617387 | 872 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
ab281629 VB |
873 | int err; |
874 | ||
875 | idr_preload(GFP_KERNEL); | |
876 | spin_lock(&tn->idr_lock); | |
877 | err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, | |
878 | GFP_NOWAIT); | |
879 | spin_unlock(&tn->idr_lock); | |
880 | idr_preload_end(); | |
48617387 | 881 | |
ab281629 | 882 | return err; |
a9b19443 JP |
883 | } |
884 | ||
48617387 JP |
885 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
886 | { | |
887 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
888 | ||
ab281629 | 889 | spin_lock(&tn->idr_lock); |
9c160941 | 890 | idr_remove(&tn->idr, block->index); |
ab281629 | 891 | spin_unlock(&tn->idr_lock); |
48617387 JP |
892 | } |
893 | ||
894 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 895 | u32 block_index, |
48617387 | 896 | struct netlink_ext_ack *extack) |
6529eaba | 897 | { |
48617387 | 898 | struct tcf_block *block; |
6529eaba | 899 | |
48617387 | 900 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
901 | if (!block) { |
902 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 903 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 904 | } |
c266f64d | 905 | mutex_init(&block->lock); |
59eb87cb | 906 | mutex_init(&block->proto_destroy_lock); |
4f8116c8 | 907 | init_rwsem(&block->cb_lock); |
14bfb13f | 908 | flow_block_init(&block->flow_block); |
5bc17018 | 909 | INIT_LIST_HEAD(&block->chain_list); |
f36fe1c4 | 910 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 911 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 912 | |
cfebd7e2 | 913 | refcount_set(&block->refcnt, 1); |
48617387 | 914 | block->net = net; |
bb047ddd JP |
915 | block->index = block_index; |
916 | ||
917 | /* Don't store q pointer for blocks which are shared */ | |
918 | if (!tcf_block_shared(block)) | |
919 | block->q = q; | |
48617387 | 920 | return block; |
48617387 JP |
921 | } |
922 | ||
923 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
924 | { | |
925 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
926 | ||
322d884b | 927 | return idr_find(&tn->idr, block_index); |
48617387 JP |
928 | } |
929 | ||
0607e439 VB |
930 | static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
931 | { | |
932 | struct tcf_block *block; | |
933 | ||
934 | rcu_read_lock(); | |
935 | block = tcf_block_lookup(net, block_index); | |
936 | if (block && !refcount_inc_not_zero(&block->refcnt)) | |
937 | block = NULL; | |
938 | rcu_read_unlock(); | |
939 | ||
940 | return block; | |
941 | } | |
942 | ||
bbf73830 VB |
943 | static struct tcf_chain * |
944 | __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 945 | { |
bbf73830 VB |
946 | mutex_lock(&block->lock); |
947 | if (chain) | |
948 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
949 | NULL : list_next_entry(chain, list); | |
950 | else | |
951 | chain = list_first_entry_or_null(&block->chain_list, | |
952 | struct tcf_chain, list); | |
f0023436 | 953 | |
bbf73830 VB |
954 | /* skip all action-only chains */ |
955 | while (chain && tcf_chain_held_by_acts_only(chain)) | |
956 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
957 | NULL : list_next_entry(chain, list); | |
958 | ||
959 | if (chain) | |
f0023436 | 960 | tcf_chain_hold(chain); |
bbf73830 | 961 | mutex_unlock(&block->lock); |
f0023436 | 962 | |
bbf73830 | 963 | return chain; |
f0023436 VB |
964 | } |
965 | ||
bbf73830 VB |
966 | /* Function to be used by all clients that want to iterate over all chains on |
967 | * block. It properly obtains block->lock and takes reference to chain before | |
968 | * returning it. Users of this function must be tolerant to concurrent chain | |
969 | * insertion/deletion or ensure that no concurrent chain modification is | |
970 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
971 | * consistent dump because rtnl lock is released each time skb is filled with | |
972 | * data and sent to user-space. | |
973 | */ | |
974 | ||
975 | struct tcf_chain * | |
976 | tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 977 | { |
bbf73830 | 978 | struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain); |
f0023436 | 979 | |
bbf73830 | 980 | if (chain) |
f0023436 | 981 | tcf_chain_put(chain); |
bbf73830 VB |
982 | |
983 | return chain_next; | |
984 | } | |
985 | EXPORT_SYMBOL(tcf_get_next_chain); | |
986 | ||
fe2923af VB |
987 | static struct tcf_proto * |
988 | __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) | |
989 | { | |
8b64678e VB |
990 | u32 prio = 0; |
991 | ||
fe2923af VB |
992 | ASSERT_RTNL(); |
993 | mutex_lock(&chain->filter_chain_lock); | |
994 | ||
8b64678e | 995 | if (!tp) { |
fe2923af | 996 | tp = tcf_chain_dereference(chain->filter_chain, chain); |
8b64678e VB |
997 | } else if (tcf_proto_is_deleting(tp)) { |
998 | /* 'deleting' flag is set and chain->filter_chain_lock was | |
999 | * unlocked, which means next pointer could be invalid. Restart | |
1000 | * search. | |
1001 | */ | |
1002 | prio = tp->prio + 1; | |
1003 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
1004 | ||
1005 | for (; tp; tp = tcf_chain_dereference(tp->next, chain)) | |
1006 | if (!tp->deleting && tp->prio >= prio) | |
1007 | break; | |
1008 | } else { | |
fe2923af | 1009 | tp = tcf_chain_dereference(tp->next, chain); |
8b64678e | 1010 | } |
fe2923af VB |
1011 | |
1012 | if (tp) | |
1013 | tcf_proto_get(tp); | |
1014 | ||
1015 | mutex_unlock(&chain->filter_chain_lock); | |
1016 | ||
1017 | return tp; | |
1018 | } | |
1019 | ||
1020 | /* Function to be used by all clients that want to iterate over all tp's on | |
1021 | * chain. Users of this function must be tolerant to concurrent tp | |
1022 | * insertion/deletion or ensure that no concurrent chain modification is | |
1023 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
1024 | * consistent dump because rtnl lock is released each time skb is filled with | |
1025 | * data and sent to user-space. | |
1026 | */ | |
1027 | ||
1028 | struct tcf_proto * | |
12db03b6 VB |
1029 | tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp, |
1030 | bool rtnl_held) | |
fe2923af VB |
1031 | { |
1032 | struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp); | |
1033 | ||
1034 | if (tp) | |
12db03b6 | 1035 | tcf_proto_put(tp, rtnl_held, NULL); |
fe2923af VB |
1036 | |
1037 | return tp_next; | |
1038 | } | |
1039 | EXPORT_SYMBOL(tcf_get_next_proto); | |
1040 | ||
12db03b6 | 1041 | static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held) |
bbf73830 VB |
1042 | { |
1043 | struct tcf_chain *chain; | |
1044 | ||
1045 | /* Last reference to block. At this point chains cannot be added or | |
1046 | * removed concurrently. | |
1047 | */ | |
1048 | for (chain = tcf_get_next_chain(block, NULL); | |
1049 | chain; | |
1050 | chain = tcf_get_next_chain(block, chain)) { | |
1051 | tcf_chain_put_explicitly_created(chain); | |
12db03b6 | 1052 | tcf_chain_flush(chain, rtnl_held); |
f0023436 VB |
1053 | } |
1054 | } | |
1055 | ||
18d3eefb VB |
1056 | /* Lookup Qdisc and increments its reference counter. |
1057 | * Set parent, if necessary. | |
1058 | */ | |
1059 | ||
1060 | static int __tcf_qdisc_find(struct net *net, struct Qdisc **q, | |
1061 | u32 *parent, int ifindex, bool rtnl_held, | |
1062 | struct netlink_ext_ack *extack) | |
1063 | { | |
1064 | const struct Qdisc_class_ops *cops; | |
1065 | struct net_device *dev; | |
1066 | int err = 0; | |
1067 | ||
1068 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1069 | return 0; | |
1070 | ||
1071 | rcu_read_lock(); | |
1072 | ||
1073 | /* Find link */ | |
1074 | dev = dev_get_by_index_rcu(net, ifindex); | |
1075 | if (!dev) { | |
1076 | rcu_read_unlock(); | |
1077 | return -ENODEV; | |
1078 | } | |
1079 | ||
1080 | /* Find qdisc */ | |
1081 | if (!*parent) { | |
1082 | *q = dev->qdisc; | |
1083 | *parent = (*q)->handle; | |
1084 | } else { | |
1085 | *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); | |
1086 | if (!*q) { | |
1087 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1088 | err = -EINVAL; | |
1089 | goto errout_rcu; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | *q = qdisc_refcount_inc_nz(*q); | |
1094 | if (!*q) { | |
1095 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1096 | err = -EINVAL; | |
1097 | goto errout_rcu; | |
1098 | } | |
1099 | ||
1100 | /* Is it classful? */ | |
1101 | cops = (*q)->ops->cl_ops; | |
1102 | if (!cops) { | |
1103 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
1104 | err = -EINVAL; | |
1105 | goto errout_qdisc; | |
1106 | } | |
1107 | ||
1108 | if (!cops->tcf_block) { | |
1109 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
1110 | err = -EOPNOTSUPP; | |
1111 | goto errout_qdisc; | |
1112 | } | |
1113 | ||
1114 | errout_rcu: | |
1115 | /* At this point we know that qdisc is not noop_qdisc, | |
1116 | * which means that qdisc holds a reference to net_device | |
1117 | * and we hold a reference to qdisc, so it is safe to release | |
1118 | * rcu read lock. | |
1119 | */ | |
1120 | rcu_read_unlock(); | |
1121 | return err; | |
1122 | ||
1123 | errout_qdisc: | |
1124 | rcu_read_unlock(); | |
1125 | ||
1126 | if (rtnl_held) | |
1127 | qdisc_put(*q); | |
1128 | else | |
1129 | qdisc_put_unlocked(*q); | |
1130 | *q = NULL; | |
1131 | ||
1132 | return err; | |
1133 | } | |
1134 | ||
1135 | static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl, | |
1136 | int ifindex, struct netlink_ext_ack *extack) | |
1137 | { | |
1138 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1139 | return 0; | |
1140 | ||
1141 | /* Do we search for filter, attached to class? */ | |
1142 | if (TC_H_MIN(parent)) { | |
1143 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1144 | ||
1145 | *cl = cops->find(q, parent); | |
1146 | if (*cl == 0) { | |
1147 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
1148 | return -ENOENT; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q, | |
1156 | unsigned long cl, int ifindex, | |
1157 | u32 block_index, | |
1158 | struct netlink_ext_ack *extack) | |
1159 | { | |
1160 | struct tcf_block *block; | |
1161 | ||
1162 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
1163 | block = tcf_block_refcnt_get(net, block_index); | |
1164 | if (!block) { | |
1165 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
1166 | return ERR_PTR(-EINVAL); | |
1167 | } | |
1168 | } else { | |
1169 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1170 | ||
1171 | block = cops->tcf_block(q, cl, extack); | |
1172 | if (!block) | |
1173 | return ERR_PTR(-EINVAL); | |
1174 | ||
1175 | if (tcf_block_shared(block)) { | |
1176 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
1177 | return ERR_PTR(-EOPNOTSUPP); | |
1178 | } | |
1179 | ||
1180 | /* Always take reference to block in order to support execution | |
1181 | * of rules update path of cls API without rtnl lock. Caller | |
1182 | * must release block when it is finished using it. 'if' block | |
1183 | * of this conditional obtain reference to block by calling | |
1184 | * tcf_block_refcnt_get(). | |
1185 | */ | |
1186 | refcount_inc(&block->refcnt); | |
1187 | } | |
1188 | ||
1189 | return block; | |
1190 | } | |
1191 | ||
0607e439 | 1192 | static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
12db03b6 | 1193 | struct tcf_block_ext_info *ei, bool rtnl_held) |
0607e439 | 1194 | { |
c266f64d | 1195 | if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) { |
0607e439 VB |
1196 | /* Flushing/putting all chains will cause the block to be |
1197 | * deallocated when last chain is freed. However, if chain_list | |
1198 | * is empty, block has to be manually deallocated. After block | |
1199 | * reference counter reached 0, it is no longer possible to | |
1200 | * increment it or add new chains to block. | |
1201 | */ | |
1202 | bool free_block = list_empty(&block->chain_list); | |
1203 | ||
c266f64d | 1204 | mutex_unlock(&block->lock); |
0607e439 VB |
1205 | if (tcf_block_shared(block)) |
1206 | tcf_block_remove(block, block->net); | |
0607e439 VB |
1207 | |
1208 | if (q) | |
1209 | tcf_block_offload_unbind(block, q, ei); | |
1210 | ||
1211 | if (free_block) | |
c266f64d | 1212 | tcf_block_destroy(block); |
0607e439 | 1213 | else |
12db03b6 | 1214 | tcf_block_flush_all_chains(block, rtnl_held); |
0607e439 VB |
1215 | } else if (q) { |
1216 | tcf_block_offload_unbind(block, q, ei); | |
1217 | } | |
1218 | } | |
1219 | ||
12db03b6 | 1220 | static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held) |
0607e439 | 1221 | { |
12db03b6 | 1222 | __tcf_block_put(block, NULL, NULL, rtnl_held); |
0607e439 VB |
1223 | } |
1224 | ||
c431f89b VB |
1225 | /* Find tcf block. |
1226 | * Set q, parent, cl when appropriate. | |
1227 | */ | |
1228 | ||
1229 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
1230 | u32 *parent, unsigned long *cl, | |
1231 | int ifindex, u32 block_index, | |
1232 | struct netlink_ext_ack *extack) | |
1233 | { | |
1234 | struct tcf_block *block; | |
e368fdb6 | 1235 | int err = 0; |
c431f89b | 1236 | |
18d3eefb | 1237 | ASSERT_RTNL(); |
e368fdb6 | 1238 | |
18d3eefb VB |
1239 | err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack); |
1240 | if (err) | |
1241 | goto errout; | |
c431f89b | 1242 | |
18d3eefb VB |
1243 | err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack); |
1244 | if (err) | |
1245 | goto errout_qdisc; | |
787ce6d0 | 1246 | |
18d3eefb | 1247 | block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack); |
af736bf0 DC |
1248 | if (IS_ERR(block)) { |
1249 | err = PTR_ERR(block); | |
18d3eefb | 1250 | goto errout_qdisc; |
af736bf0 | 1251 | } |
c431f89b VB |
1252 | |
1253 | return block; | |
e368fdb6 | 1254 | |
e368fdb6 | 1255 | errout_qdisc: |
18d3eefb | 1256 | if (*q) |
e368fdb6 | 1257 | qdisc_put(*q); |
18d3eefb VB |
1258 | errout: |
1259 | *q = NULL; | |
e368fdb6 VB |
1260 | return ERR_PTR(err); |
1261 | } | |
1262 | ||
12db03b6 VB |
1263 | static void tcf_block_release(struct Qdisc *q, struct tcf_block *block, |
1264 | bool rtnl_held) | |
e368fdb6 | 1265 | { |
787ce6d0 | 1266 | if (!IS_ERR_OR_NULL(block)) |
12db03b6 | 1267 | tcf_block_refcnt_put(block, rtnl_held); |
787ce6d0 | 1268 | |
470502de VB |
1269 | if (q) { |
1270 | if (rtnl_held) | |
1271 | qdisc_put(q); | |
1272 | else | |
1273 | qdisc_put_unlocked(q); | |
1274 | } | |
c431f89b VB |
1275 | } |
1276 | ||
f36fe1c4 JP |
1277 | struct tcf_block_owner_item { |
1278 | struct list_head list; | |
1279 | struct Qdisc *q; | |
32f8c409 | 1280 | enum flow_block_binder_type binder_type; |
f36fe1c4 JP |
1281 | }; |
1282 | ||
1283 | static void | |
1284 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
1285 | struct Qdisc *q, | |
32f8c409 | 1286 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1287 | { |
1288 | if (block->keep_dst && | |
32f8c409 PNA |
1289 | binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS && |
1290 | binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
f36fe1c4 JP |
1291 | netif_keep_dst(qdisc_dev(q)); |
1292 | } | |
1293 | ||
1294 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
1295 | { | |
1296 | struct tcf_block_owner_item *item; | |
1297 | ||
1298 | block->keep_dst = true; | |
1299 | list_for_each_entry(item, &block->owner_list, list) | |
1300 | tcf_block_owner_netif_keep_dst(block, item->q, | |
1301 | item->binder_type); | |
1302 | } | |
1303 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
1304 | ||
1305 | static int tcf_block_owner_add(struct tcf_block *block, | |
1306 | struct Qdisc *q, | |
32f8c409 | 1307 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1308 | { |
1309 | struct tcf_block_owner_item *item; | |
1310 | ||
1311 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
1312 | if (!item) | |
1313 | return -ENOMEM; | |
1314 | item->q = q; | |
1315 | item->binder_type = binder_type; | |
1316 | list_add(&item->list, &block->owner_list); | |
1317 | return 0; | |
1318 | } | |
1319 | ||
1320 | static void tcf_block_owner_del(struct tcf_block *block, | |
1321 | struct Qdisc *q, | |
32f8c409 | 1322 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1323 | { |
1324 | struct tcf_block_owner_item *item; | |
1325 | ||
1326 | list_for_each_entry(item, &block->owner_list, list) { | |
1327 | if (item->q == q && item->binder_type == binder_type) { | |
1328 | list_del(&item->list); | |
1329 | kfree(item); | |
1330 | return; | |
1331 | } | |
1332 | } | |
1333 | WARN_ON(1); | |
1334 | } | |
1335 | ||
48617387 JP |
1336 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
1337 | struct tcf_block_ext_info *ei, | |
1338 | struct netlink_ext_ack *extack) | |
1339 | { | |
1340 | struct net *net = qdisc_net(q); | |
1341 | struct tcf_block *block = NULL; | |
48617387 JP |
1342 | int err; |
1343 | ||
787ce6d0 | 1344 | if (ei->block_index) |
48617387 | 1345 | /* block_index not 0 means the shared block is requested */ |
787ce6d0 | 1346 | block = tcf_block_refcnt_get(net, ei->block_index); |
48617387 JP |
1347 | |
1348 | if (!block) { | |
bb047ddd | 1349 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
1350 | if (IS_ERR(block)) |
1351 | return PTR_ERR(block); | |
bb047ddd JP |
1352 | if (tcf_block_shared(block)) { |
1353 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
1354 | if (err) |
1355 | goto err_block_insert; | |
1356 | } | |
1357 | } | |
1358 | ||
f36fe1c4 JP |
1359 | err = tcf_block_owner_add(block, q, ei->binder_type); |
1360 | if (err) | |
1361 | goto err_block_owner_add; | |
1362 | ||
1363 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
1364 | ||
f71e0ca4 | 1365 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 1366 | if (err) |
f71e0ca4 | 1367 | goto err_chain0_head_change_cb_add; |
caa72601 | 1368 | |
60513bd8 | 1369 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
1370 | if (err) |
1371 | goto err_block_offload_bind; | |
1372 | ||
6529eaba JP |
1373 | *p_block = block; |
1374 | return 0; | |
2190d1d0 | 1375 | |
caa72601 | 1376 | err_block_offload_bind: |
f71e0ca4 JP |
1377 | tcf_chain0_head_change_cb_del(block, ei); |
1378 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
1379 | tcf_block_owner_del(block, q, ei->binder_type); |
1380 | err_block_owner_add: | |
48617387 | 1381 | err_block_insert: |
12db03b6 | 1382 | tcf_block_refcnt_put(block, true); |
2190d1d0 | 1383 | return err; |
6529eaba | 1384 | } |
8c4083b3 JP |
1385 | EXPORT_SYMBOL(tcf_block_get_ext); |
1386 | ||
c7eb7d72 JP |
1387 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
1388 | { | |
1389 | struct tcf_proto __rcu **p_filter_chain = priv; | |
1390 | ||
1391 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
1392 | } | |
1393 | ||
8c4083b3 | 1394 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
1395 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
1396 | struct netlink_ext_ack *extack) | |
8c4083b3 | 1397 | { |
c7eb7d72 JP |
1398 | struct tcf_block_ext_info ei = { |
1399 | .chain_head_change = tcf_chain_head_change_dflt, | |
1400 | .chain_head_change_priv = p_filter_chain, | |
1401 | }; | |
8c4083b3 | 1402 | |
c7eb7d72 | 1403 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 1404 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 1405 | } |
6529eaba JP |
1406 | EXPORT_SYMBOL(tcf_block_get); |
1407 | ||
7aa0045d | 1408 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 1409 | * actions should be all removed after flushing. |
7aa0045d | 1410 | */ |
c7eb7d72 | 1411 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 1412 | struct tcf_block_ext_info *ei) |
7aa0045d | 1413 | { |
c30abd5e DM |
1414 | if (!block) |
1415 | return; | |
f71e0ca4 | 1416 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 1417 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 1418 | |
12db03b6 | 1419 | __tcf_block_put(block, q, ei, true); |
6529eaba | 1420 | } |
8c4083b3 JP |
1421 | EXPORT_SYMBOL(tcf_block_put_ext); |
1422 | ||
1423 | void tcf_block_put(struct tcf_block *block) | |
1424 | { | |
1425 | struct tcf_block_ext_info ei = {0, }; | |
1426 | ||
4853f128 JP |
1427 | if (!block) |
1428 | return; | |
c7eb7d72 | 1429 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 1430 | } |
e1ea2f98 | 1431 | |
6529eaba | 1432 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 1433 | |
32636742 | 1434 | static int |
a7323311 | 1435 | tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb, |
32636742 JH |
1436 | void *cb_priv, bool add, bool offload_in_use, |
1437 | struct netlink_ext_ack *extack) | |
1438 | { | |
bbf73830 | 1439 | struct tcf_chain *chain, *chain_prev; |
fe2923af | 1440 | struct tcf_proto *tp, *tp_prev; |
32636742 JH |
1441 | int err; |
1442 | ||
4f8116c8 VB |
1443 | lockdep_assert_held(&block->cb_lock); |
1444 | ||
bbf73830 VB |
1445 | for (chain = __tcf_get_next_chain(block, NULL); |
1446 | chain; | |
1447 | chain_prev = chain, | |
1448 | chain = __tcf_get_next_chain(block, chain), | |
1449 | tcf_chain_put(chain_prev)) { | |
fe2923af VB |
1450 | for (tp = __tcf_get_next_proto(chain, NULL); tp; |
1451 | tp_prev = tp, | |
1452 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 1453 | tcf_proto_put(tp_prev, true, NULL)) { |
32636742 JH |
1454 | if (tp->ops->reoffload) { |
1455 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
1456 | extack); | |
1457 | if (err && add) | |
1458 | goto err_playback_remove; | |
1459 | } else if (add && offload_in_use) { | |
1460 | err = -EOPNOTSUPP; | |
1461 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
1462 | goto err_playback_remove; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | return 0; | |
1468 | ||
1469 | err_playback_remove: | |
12db03b6 | 1470 | tcf_proto_put(tp, true, NULL); |
bbf73830 | 1471 | tcf_chain_put(chain); |
32636742 JH |
1472 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, |
1473 | extack); | |
1474 | return err; | |
1475 | } | |
1476 | ||
59094b1e PNA |
1477 | static int tcf_block_bind(struct tcf_block *block, |
1478 | struct flow_block_offload *bo) | |
1479 | { | |
1480 | struct flow_block_cb *block_cb, *next; | |
1481 | int err, i = 0; | |
1482 | ||
4f8116c8 VB |
1483 | lockdep_assert_held(&block->cb_lock); |
1484 | ||
59094b1e PNA |
1485 | list_for_each_entry(block_cb, &bo->cb_list, list) { |
1486 | err = tcf_block_playback_offloads(block, block_cb->cb, | |
1487 | block_cb->cb_priv, true, | |
1488 | tcf_block_offload_in_use(block), | |
1489 | bo->extack); | |
1490 | if (err) | |
1491 | goto err_unroll; | |
c9f14470 VB |
1492 | if (!bo->unlocked_driver_cb) |
1493 | block->lockeddevcnt++; | |
59094b1e PNA |
1494 | |
1495 | i++; | |
1496 | } | |
14bfb13f | 1497 | list_splice(&bo->cb_list, &block->flow_block.cb_list); |
59094b1e PNA |
1498 | |
1499 | return 0; | |
1500 | ||
1501 | err_unroll: | |
1502 | list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { | |
1503 | if (i-- > 0) { | |
1504 | list_del(&block_cb->list); | |
1505 | tcf_block_playback_offloads(block, block_cb->cb, | |
1506 | block_cb->cb_priv, false, | |
1507 | tcf_block_offload_in_use(block), | |
1508 | NULL); | |
c9f14470 VB |
1509 | if (!bo->unlocked_driver_cb) |
1510 | block->lockeddevcnt--; | |
59094b1e PNA |
1511 | } |
1512 | flow_block_cb_free(block_cb); | |
1513 | } | |
1514 | ||
1515 | return err; | |
1516 | } | |
1517 | ||
1518 | static void tcf_block_unbind(struct tcf_block *block, | |
1519 | struct flow_block_offload *bo) | |
1520 | { | |
1521 | struct flow_block_cb *block_cb, *next; | |
1522 | ||
4f8116c8 VB |
1523 | lockdep_assert_held(&block->cb_lock); |
1524 | ||
59094b1e PNA |
1525 | list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { |
1526 | tcf_block_playback_offloads(block, block_cb->cb, | |
1527 | block_cb->cb_priv, false, | |
1528 | tcf_block_offload_in_use(block), | |
1529 | NULL); | |
1530 | list_del(&block_cb->list); | |
1531 | flow_block_cb_free(block_cb); | |
c9f14470 VB |
1532 | if (!bo->unlocked_driver_cb) |
1533 | block->lockeddevcnt--; | |
59094b1e PNA |
1534 | } |
1535 | } | |
1536 | ||
1537 | static int tcf_block_setup(struct tcf_block *block, | |
1538 | struct flow_block_offload *bo) | |
1539 | { | |
1540 | int err; | |
1541 | ||
1542 | switch (bo->command) { | |
1543 | case FLOW_BLOCK_BIND: | |
1544 | err = tcf_block_bind(block, bo); | |
1545 | break; | |
1546 | case FLOW_BLOCK_UNBIND: | |
1547 | err = 0; | |
1548 | tcf_block_unbind(block, bo); | |
1549 | break; | |
1550 | default: | |
1551 | WARN_ON_ONCE(1); | |
1552 | err = -EOPNOTSUPP; | |
1553 | } | |
1554 | ||
1555 | return err; | |
1556 | } | |
1557 | ||
87d83093 JP |
1558 | /* Main classifier routine: scans classifier chain attached |
1559 | * to this qdisc, (optionally) tests for protocol and asks | |
1560 | * specific classifiers. | |
1561 | */ | |
1562 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
1563 | struct tcf_result *res, bool compat_mode) | |
1564 | { | |
87d83093 JP |
1565 | #ifdef CONFIG_NET_CLS_ACT |
1566 | const int max_reclassify_loop = 4; | |
ee538dce JP |
1567 | const struct tcf_proto *orig_tp = tp; |
1568 | const struct tcf_proto *first_tp; | |
87d83093 JP |
1569 | int limit = 0; |
1570 | ||
1571 | reclassify: | |
1572 | #endif | |
1573 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
cd0c4e70 | 1574 | __be16 protocol = tc_skb_protocol(skb); |
87d83093 JP |
1575 | int err; |
1576 | ||
1577 | if (tp->protocol != protocol && | |
1578 | tp->protocol != htons(ETH_P_ALL)) | |
1579 | continue; | |
1580 | ||
1581 | err = tp->classify(skb, tp, res); | |
1582 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 1583 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 1584 | first_tp = orig_tp; |
87d83093 | 1585 | goto reset; |
db50514f | 1586 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 1587 | first_tp = res->goto_tp; |
95a7233c PB |
1588 | |
1589 | #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) | |
1590 | { | |
1591 | struct tc_skb_ext *ext; | |
1592 | ||
1593 | ext = skb_ext_add(skb, TC_SKB_EXT); | |
1594 | if (WARN_ON_ONCE(!ext)) | |
1595 | return TC_ACT_SHOT; | |
1596 | ||
1597 | ext->chain = err & TC_ACT_EXT_VAL_MASK; | |
1598 | } | |
1599 | #endif | |
db50514f JP |
1600 | goto reset; |
1601 | } | |
87d83093 JP |
1602 | #endif |
1603 | if (err >= 0) | |
1604 | return err; | |
1605 | } | |
1606 | ||
1607 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
1608 | #ifdef CONFIG_NET_CLS_ACT | |
1609 | reset: | |
1610 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
1611 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
1612 | tp->chain->block->index, | |
1613 | tp->prio & 0xffff, | |
87d83093 JP |
1614 | ntohs(tp->protocol)); |
1615 | return TC_ACT_SHOT; | |
1616 | } | |
1617 | ||
ee538dce | 1618 | tp = first_tp; |
87d83093 JP |
1619 | goto reclassify; |
1620 | #endif | |
1621 | } | |
1622 | EXPORT_SYMBOL(tcf_classify); | |
1623 | ||
2190d1d0 JP |
1624 | struct tcf_chain_info { |
1625 | struct tcf_proto __rcu **pprev; | |
1626 | struct tcf_proto __rcu *next; | |
1627 | }; | |
1628 | ||
ed76f5ed VB |
1629 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain, |
1630 | struct tcf_chain_info *chain_info) | |
2190d1d0 | 1631 | { |
ed76f5ed | 1632 | return tcf_chain_dereference(*chain_info->pprev, chain); |
2190d1d0 JP |
1633 | } |
1634 | ||
726d0612 VB |
1635 | static int tcf_chain_tp_insert(struct tcf_chain *chain, |
1636 | struct tcf_chain_info *chain_info, | |
1637 | struct tcf_proto *tp) | |
2190d1d0 | 1638 | { |
726d0612 VB |
1639 | if (chain->flushing) |
1640 | return -EAGAIN; | |
1641 | ||
c7eb7d72 | 1642 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1643 | tcf_chain0_head_change(chain, tp); |
4dbfa766 | 1644 | tcf_proto_get(tp); |
ed76f5ed | 1645 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info)); |
2190d1d0 | 1646 | rcu_assign_pointer(*chain_info->pprev, tp); |
726d0612 VB |
1647 | |
1648 | return 0; | |
2190d1d0 JP |
1649 | } |
1650 | ||
1651 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1652 | struct tcf_chain_info *chain_info, | |
1653 | struct tcf_proto *tp) | |
1654 | { | |
ed76f5ed | 1655 | struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain); |
2190d1d0 | 1656 | |
8b64678e | 1657 | tcf_proto_mark_delete(tp); |
c7eb7d72 | 1658 | if (tp == chain->filter_chain) |
f71e0ca4 | 1659 | tcf_chain0_head_change(chain, next); |
2190d1d0 JP |
1660 | RCU_INIT_POINTER(*chain_info->pprev, next); |
1661 | } | |
1662 | ||
8b64678e VB |
1663 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1664 | struct tcf_chain_info *chain_info, | |
1665 | u32 protocol, u32 prio, | |
1666 | bool prio_allocate); | |
1667 | ||
1668 | /* Try to insert new proto. | |
1669 | * If proto with specified priority already exists, free new proto | |
1670 | * and return existing one. | |
1671 | */ | |
1672 | ||
1673 | static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain, | |
1674 | struct tcf_proto *tp_new, | |
12db03b6 VB |
1675 | u32 protocol, u32 prio, |
1676 | bool rtnl_held) | |
8b64678e VB |
1677 | { |
1678 | struct tcf_chain_info chain_info; | |
1679 | struct tcf_proto *tp; | |
726d0612 | 1680 | int err = 0; |
8b64678e VB |
1681 | |
1682 | mutex_lock(&chain->filter_chain_lock); | |
1683 | ||
59eb87cb JH |
1684 | if (tcf_proto_exists_destroying(chain, tp_new)) { |
1685 | mutex_unlock(&chain->filter_chain_lock); | |
1686 | tcf_proto_destroy(tp_new, rtnl_held, false, NULL); | |
1687 | return ERR_PTR(-EAGAIN); | |
1688 | } | |
1689 | ||
8b64678e VB |
1690 | tp = tcf_chain_tp_find(chain, &chain_info, |
1691 | protocol, prio, false); | |
1692 | if (!tp) | |
726d0612 | 1693 | err = tcf_chain_tp_insert(chain, &chain_info, tp_new); |
8b64678e VB |
1694 | mutex_unlock(&chain->filter_chain_lock); |
1695 | ||
1696 | if (tp) { | |
59eb87cb | 1697 | tcf_proto_destroy(tp_new, rtnl_held, false, NULL); |
8b64678e | 1698 | tp_new = tp; |
726d0612 | 1699 | } else if (err) { |
59eb87cb | 1700 | tcf_proto_destroy(tp_new, rtnl_held, false, NULL); |
726d0612 | 1701 | tp_new = ERR_PTR(err); |
8b64678e VB |
1702 | } |
1703 | ||
1704 | return tp_new; | |
1705 | } | |
1706 | ||
1707 | static void tcf_chain_tp_delete_empty(struct tcf_chain *chain, | |
12db03b6 | 1708 | struct tcf_proto *tp, bool rtnl_held, |
8b64678e VB |
1709 | struct netlink_ext_ack *extack) |
1710 | { | |
1711 | struct tcf_chain_info chain_info; | |
1712 | struct tcf_proto *tp_iter; | |
1713 | struct tcf_proto **pprev; | |
1714 | struct tcf_proto *next; | |
1715 | ||
1716 | mutex_lock(&chain->filter_chain_lock); | |
1717 | ||
1718 | /* Atomically find and remove tp from chain. */ | |
1719 | for (pprev = &chain->filter_chain; | |
1720 | (tp_iter = tcf_chain_dereference(*pprev, chain)); | |
1721 | pprev = &tp_iter->next) { | |
1722 | if (tp_iter == tp) { | |
1723 | chain_info.pprev = pprev; | |
1724 | chain_info.next = tp_iter->next; | |
1725 | WARN_ON(tp_iter->deleting); | |
1726 | break; | |
1727 | } | |
1728 | } | |
1729 | /* Verify that tp still exists and no new filters were inserted | |
1730 | * concurrently. | |
1731 | * Mark tp for deletion if it is empty. | |
1732 | */ | |
a5b72a08 | 1733 | if (!tp_iter || !tcf_proto_check_delete(tp)) { |
8b64678e VB |
1734 | mutex_unlock(&chain->filter_chain_lock); |
1735 | return; | |
1736 | } | |
1737 | ||
59eb87cb | 1738 | tcf_proto_signal_destroying(chain, tp); |
8b64678e VB |
1739 | next = tcf_chain_dereference(chain_info.next, chain); |
1740 | if (tp == chain->filter_chain) | |
1741 | tcf_chain0_head_change(chain, next); | |
1742 | RCU_INIT_POINTER(*chain_info.pprev, next); | |
1743 | mutex_unlock(&chain->filter_chain_lock); | |
1744 | ||
12db03b6 | 1745 | tcf_proto_put(tp, rtnl_held, extack); |
8b64678e VB |
1746 | } |
1747 | ||
2190d1d0 JP |
1748 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1749 | struct tcf_chain_info *chain_info, | |
1750 | u32 protocol, u32 prio, | |
1751 | bool prio_allocate) | |
1752 | { | |
1753 | struct tcf_proto **pprev; | |
1754 | struct tcf_proto *tp; | |
1755 | ||
1756 | /* Check the chain for existence of proto-tcf with this priority */ | |
1757 | for (pprev = &chain->filter_chain; | |
ed76f5ed VB |
1758 | (tp = tcf_chain_dereference(*pprev, chain)); |
1759 | pprev = &tp->next) { | |
2190d1d0 JP |
1760 | if (tp->prio >= prio) { |
1761 | if (tp->prio == prio) { | |
1762 | if (prio_allocate || | |
1763 | (tp->protocol != protocol && protocol)) | |
1764 | return ERR_PTR(-EINVAL); | |
1765 | } else { | |
1766 | tp = NULL; | |
1767 | } | |
1768 | break; | |
1769 | } | |
1770 | } | |
1771 | chain_info->pprev = pprev; | |
4dbfa766 VB |
1772 | if (tp) { |
1773 | chain_info->next = tp->next; | |
1774 | tcf_proto_get(tp); | |
1775 | } else { | |
1776 | chain_info->next = NULL; | |
1777 | } | |
2190d1d0 JP |
1778 | return tp; |
1779 | } | |
1780 | ||
7120371c | 1781 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1782 | struct tcf_proto *tp, struct tcf_block *block, |
1783 | struct Qdisc *q, u32 parent, void *fh, | |
12db03b6 VB |
1784 | u32 portid, u32 seq, u16 flags, int event, |
1785 | bool rtnl_held) | |
7120371c WC |
1786 | { |
1787 | struct tcmsg *tcm; | |
1788 | struct nlmsghdr *nlh; | |
1789 | unsigned char *b = skb_tail_pointer(skb); | |
1790 | ||
1791 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1792 | if (!nlh) | |
1793 | goto out_nlmsg_trim; | |
1794 | tcm = nlmsg_data(nlh); | |
1795 | tcm->tcm_family = AF_UNSPEC; | |
1796 | tcm->tcm__pad1 = 0; | |
1797 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1798 | if (q) { |
1799 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1800 | tcm->tcm_parent = parent; | |
1801 | } else { | |
1802 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1803 | tcm->tcm_block_index = block->index; | |
1804 | } | |
7120371c WC |
1805 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1806 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1807 | goto nla_put_failure; | |
1808 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1809 | goto nla_put_failure; | |
1810 | if (!fh) { | |
1811 | tcm->tcm_handle = 0; | |
1812 | } else { | |
12db03b6 VB |
1813 | if (tp->ops->dump && |
1814 | tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0) | |
7120371c WC |
1815 | goto nla_put_failure; |
1816 | } | |
1817 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1818 | return skb->len; | |
1819 | ||
1820 | out_nlmsg_trim: | |
1821 | nla_put_failure: | |
1822 | nlmsg_trim(skb, b); | |
1823 | return -1; | |
1824 | } | |
1825 | ||
1826 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1827 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1828 | struct tcf_block *block, struct Qdisc *q, |
12db03b6 VB |
1829 | u32 parent, void *fh, int event, bool unicast, |
1830 | bool rtnl_held) | |
7120371c WC |
1831 | { |
1832 | struct sk_buff *skb; | |
1833 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1834 | int err = 0; |
7120371c WC |
1835 | |
1836 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1837 | if (!skb) | |
1838 | return -ENOBUFS; | |
1839 | ||
7960d1da | 1840 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1841 | n->nlmsg_seq, n->nlmsg_flags, event, |
1842 | rtnl_held) <= 0) { | |
7120371c WC |
1843 | kfree_skb(skb); |
1844 | return -EINVAL; | |
1845 | } | |
1846 | ||
1847 | if (unicast) | |
5b5f99b1 ZW |
1848 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1849 | else | |
1850 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1851 | n->nlmsg_flags & NLM_F_ECHO); | |
7120371c | 1852 | |
5b5f99b1 ZW |
1853 | if (err > 0) |
1854 | err = 0; | |
1855 | return err; | |
7120371c WC |
1856 | } |
1857 | ||
1858 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1859 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1860 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc | 1861 | u32 parent, void *fh, bool unicast, bool *last, |
12db03b6 | 1862 | bool rtnl_held, struct netlink_ext_ack *extack) |
7120371c WC |
1863 | { |
1864 | struct sk_buff *skb; | |
1865 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1866 | int err; | |
1867 | ||
1868 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1869 | if (!skb) | |
1870 | return -ENOBUFS; | |
1871 | ||
7960d1da | 1872 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1873 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER, |
1874 | rtnl_held) <= 0) { | |
c35a4acc | 1875 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1876 | kfree_skb(skb); |
1877 | return -EINVAL; | |
1878 | } | |
1879 | ||
12db03b6 | 1880 | err = tp->ops->delete(tp, fh, last, rtnl_held, extack); |
7120371c WC |
1881 | if (err) { |
1882 | kfree_skb(skb); | |
1883 | return err; | |
1884 | } | |
1885 | ||
1886 | if (unicast) | |
5b5f99b1 ZW |
1887 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1888 | else | |
1889 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1890 | n->nlmsg_flags & NLM_F_ECHO); | |
c35a4acc AA |
1891 | if (err < 0) |
1892 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
5b5f99b1 ZW |
1893 | |
1894 | if (err > 0) | |
1895 | err = 0; | |
c35a4acc | 1896 | return err; |
7120371c WC |
1897 | } |
1898 | ||
1899 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1900 | struct tcf_block *block, struct Qdisc *q, |
1901 | u32 parent, struct nlmsghdr *n, | |
12db03b6 VB |
1902 | struct tcf_chain *chain, int event, |
1903 | bool rtnl_held) | |
7120371c WC |
1904 | { |
1905 | struct tcf_proto *tp; | |
1906 | ||
12db03b6 VB |
1907 | for (tp = tcf_get_next_proto(chain, NULL, rtnl_held); |
1908 | tp; tp = tcf_get_next_proto(chain, tp, rtnl_held)) | |
7960d1da | 1909 | tfilter_notify(net, oskb, n, tp, block, |
12db03b6 | 1910 | q, parent, NULL, event, false, rtnl_held); |
7120371c WC |
1911 | } |
1912 | ||
7d5509fa VB |
1913 | static void tfilter_put(struct tcf_proto *tp, void *fh) |
1914 | { | |
1915 | if (tp->ops->put && fh) | |
1916 | tp->ops->put(tp, fh); | |
1917 | } | |
1918 | ||
c431f89b | 1919 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1920 | struct netlink_ext_ack *extack) |
1da177e4 | 1921 | { |
3b1e0a65 | 1922 | struct net *net = sock_net(skb->sk); |
add93b61 | 1923 | struct nlattr *tca[TCA_MAX + 1]; |
6f96c3c6 | 1924 | char name[IFNAMSIZ]; |
1da177e4 LT |
1925 | struct tcmsg *t; |
1926 | u32 protocol; | |
1927 | u32 prio; | |
9d36d9e5 | 1928 | bool prio_allocate; |
1da177e4 | 1929 | u32 parent; |
5bc17018 | 1930 | u32 chain_index; |
7960d1da | 1931 | struct Qdisc *q = NULL; |
2190d1d0 | 1932 | struct tcf_chain_info chain_info; |
5bc17018 | 1933 | struct tcf_chain *chain = NULL; |
6529eaba | 1934 | struct tcf_block *block; |
1da177e4 | 1935 | struct tcf_proto *tp; |
1da177e4 | 1936 | unsigned long cl; |
8113c095 | 1937 | void *fh; |
1da177e4 | 1938 | int err; |
628185cf | 1939 | int tp_created; |
470502de | 1940 | bool rtnl_held = false; |
1da177e4 | 1941 | |
c431f89b | 1942 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1943 | return -EPERM; |
de179c8c | 1944 | |
1da177e4 | 1945 | replay: |
628185cf DB |
1946 | tp_created = 0; |
1947 | ||
8cb08174 JB |
1948 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
1949 | rtm_tca_policy, extack); | |
de179c8c H |
1950 | if (err < 0) |
1951 | return err; | |
1952 | ||
942b8165 | 1953 | t = nlmsg_data(n); |
1da177e4 LT |
1954 | protocol = TC_H_MIN(t->tcm_info); |
1955 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 1956 | prio_allocate = false; |
1da177e4 | 1957 | parent = t->tcm_parent; |
4dbfa766 | 1958 | tp = NULL; |
1da177e4 | 1959 | cl = 0; |
470502de | 1960 | block = NULL; |
1da177e4 LT |
1961 | |
1962 | if (prio == 0) { | |
c431f89b VB |
1963 | /* If no priority is provided by the user, |
1964 | * we allocate one. | |
1965 | */ | |
1966 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
1967 | prio = TC_H_MAKE(0x80000000U, 0U); | |
1968 | prio_allocate = true; | |
1969 | } else { | |
c35a4acc | 1970 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 1971 | return -ENOENT; |
ea7f8277 | 1972 | } |
1da177e4 LT |
1973 | } |
1974 | ||
1975 | /* Find head of filter chain. */ | |
1976 | ||
470502de VB |
1977 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
1978 | if (err) | |
1979 | return err; | |
1980 | ||
6f96c3c6 CW |
1981 | if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
1982 | NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); | |
1983 | err = -EINVAL; | |
1984 | goto errout; | |
1985 | } | |
1986 | ||
470502de VB |
1987 | /* Take rtnl mutex if rtnl_held was set to true on previous iteration, |
1988 | * block is shared (no qdisc found), qdisc is not unlocked, classifier | |
1989 | * type is not specified, classifier is not unlocked. | |
1990 | */ | |
1991 | if (rtnl_held || | |
1992 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
6f96c3c6 | 1993 | !tcf_proto_is_unlocked(name)) { |
470502de VB |
1994 | rtnl_held = true; |
1995 | rtnl_lock(); | |
1996 | } | |
1997 | ||
1998 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
1999 | if (err) | |
2000 | goto errout; | |
2001 | ||
2002 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2003 | extack); | |
c431f89b VB |
2004 | if (IS_ERR(block)) { |
2005 | err = PTR_ERR(block); | |
2006 | goto errout; | |
6bb16e7a | 2007 | } |
5bc17018 JP |
2008 | |
2009 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2010 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 2011 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
2012 | err = -EINVAL; |
2013 | goto errout; | |
2014 | } | |
c431f89b | 2015 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 2016 | if (!chain) { |
d5ed72a5 | 2017 | NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
c431f89b | 2018 | err = -ENOMEM; |
ea7f8277 DB |
2019 | goto errout; |
2020 | } | |
1da177e4 | 2021 | |
ed76f5ed | 2022 | mutex_lock(&chain->filter_chain_lock); |
2190d1d0 JP |
2023 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2024 | prio, prio_allocate); | |
2025 | if (IS_ERR(tp)) { | |
c35a4acc | 2026 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 | 2027 | err = PTR_ERR(tp); |
ed76f5ed | 2028 | goto errout_locked; |
1da177e4 LT |
2029 | } |
2030 | ||
2031 | if (tp == NULL) { | |
8b64678e VB |
2032 | struct tcf_proto *tp_new = NULL; |
2033 | ||
726d0612 VB |
2034 | if (chain->flushing) { |
2035 | err = -EAGAIN; | |
2036 | goto errout_locked; | |
2037 | } | |
2038 | ||
1da177e4 LT |
2039 | /* Proto-tcf does not exist, create new one */ |
2040 | ||
6bb16e7a | 2041 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 2042 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 2043 | err = -EINVAL; |
ed76f5ed | 2044 | goto errout_locked; |
6bb16e7a | 2045 | } |
1da177e4 | 2046 | |
c431f89b | 2047 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2048 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2049 | err = -ENOENT; |
ed76f5ed | 2050 | goto errout_locked; |
6bb16e7a | 2051 | } |
1da177e4 | 2052 | |
9d36d9e5 | 2053 | if (prio_allocate) |
ed76f5ed VB |
2054 | prio = tcf_auto_prio(tcf_chain_tp_prev(chain, |
2055 | &chain_info)); | |
1da177e4 | 2056 | |
ed76f5ed | 2057 | mutex_unlock(&chain->filter_chain_lock); |
36d79af7 ED |
2058 | tp_new = tcf_proto_create(name, protocol, prio, chain, |
2059 | rtnl_held, extack); | |
8b64678e VB |
2060 | if (IS_ERR(tp_new)) { |
2061 | err = PTR_ERR(tp_new); | |
726d0612 | 2062 | goto errout_tp; |
1da177e4 | 2063 | } |
ed76f5ed | 2064 | |
12186be7 | 2065 | tp_created = 1; |
12db03b6 VB |
2066 | tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio, |
2067 | rtnl_held); | |
726d0612 VB |
2068 | if (IS_ERR(tp)) { |
2069 | err = PTR_ERR(tp); | |
2070 | goto errout_tp; | |
2071 | } | |
ed76f5ed VB |
2072 | } else { |
2073 | mutex_unlock(&chain->filter_chain_lock); | |
6bb16e7a | 2074 | } |
1da177e4 | 2075 | |
8b64678e VB |
2076 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2077 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2078 | err = -EINVAL; | |
2079 | goto errout; | |
2080 | } | |
2081 | ||
1da177e4 LT |
2082 | fh = tp->ops->get(tp, t->tcm_handle); |
2083 | ||
8113c095 | 2084 | if (!fh) { |
c431f89b | 2085 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2086 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2087 | err = -ENOENT; |
1da177e4 | 2088 | goto errout; |
6bb16e7a | 2089 | } |
c431f89b | 2090 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
7d5509fa | 2091 | tfilter_put(tp, fh); |
c431f89b VB |
2092 | NL_SET_ERR_MSG(extack, "Filter already exists"); |
2093 | err = -EEXIST; | |
2094 | goto errout; | |
1da177e4 LT |
2095 | } |
2096 | ||
9f407f17 JP |
2097 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
2098 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
2099 | err = -EINVAL; | |
2100 | goto errout; | |
2101 | } | |
2102 | ||
2f7ef2f8 | 2103 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 | 2104 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
12db03b6 | 2105 | rtnl_held, extack); |
7d5509fa | 2106 | if (err == 0) { |
7960d1da | 2107 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2108 | RTM_NEWTFILTER, false, rtnl_held); |
7d5509fa | 2109 | tfilter_put(tp, fh); |
503d81d4 VB |
2110 | /* q pointer is NULL for shared blocks */ |
2111 | if (q) | |
2112 | q->flags &= ~TCQ_F_CAN_BYPASS; | |
7d5509fa | 2113 | } |
1da177e4 LT |
2114 | |
2115 | errout: | |
8b64678e | 2116 | if (err && tp_created) |
12db03b6 | 2117 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL); |
726d0612 | 2118 | errout_tp: |
4dbfa766 VB |
2119 | if (chain) { |
2120 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2121 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 VB |
2122 | if (!tp_created) |
2123 | tcf_chain_put(chain); | |
2124 | } | |
12db03b6 | 2125 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2126 | |
2127 | if (rtnl_held) | |
2128 | rtnl_unlock(); | |
2129 | ||
2130 | if (err == -EAGAIN) { | |
2131 | /* Take rtnl lock in case EAGAIN is caused by concurrent flush | |
2132 | * of target chain. | |
2133 | */ | |
2134 | rtnl_held = true; | |
1da177e4 LT |
2135 | /* Replay the request. */ |
2136 | goto replay; | |
470502de | 2137 | } |
1da177e4 | 2138 | return err; |
ed76f5ed VB |
2139 | |
2140 | errout_locked: | |
2141 | mutex_unlock(&chain->filter_chain_lock); | |
2142 | goto errout; | |
1da177e4 LT |
2143 | } |
2144 | ||
c431f89b VB |
2145 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
2146 | struct netlink_ext_ack *extack) | |
2147 | { | |
2148 | struct net *net = sock_net(skb->sk); | |
2149 | struct nlattr *tca[TCA_MAX + 1]; | |
6f96c3c6 | 2150 | char name[IFNAMSIZ]; |
c431f89b VB |
2151 | struct tcmsg *t; |
2152 | u32 protocol; | |
2153 | u32 prio; | |
2154 | u32 parent; | |
2155 | u32 chain_index; | |
2156 | struct Qdisc *q = NULL; | |
2157 | struct tcf_chain_info chain_info; | |
2158 | struct tcf_chain *chain = NULL; | |
470502de | 2159 | struct tcf_block *block = NULL; |
c431f89b VB |
2160 | struct tcf_proto *tp = NULL; |
2161 | unsigned long cl = 0; | |
2162 | void *fh = NULL; | |
2163 | int err; | |
470502de | 2164 | bool rtnl_held = false; |
c431f89b VB |
2165 | |
2166 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2167 | return -EPERM; | |
2168 | ||
8cb08174 JB |
2169 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2170 | rtm_tca_policy, extack); | |
c431f89b VB |
2171 | if (err < 0) |
2172 | return err; | |
2173 | ||
2174 | t = nlmsg_data(n); | |
2175 | protocol = TC_H_MIN(t->tcm_info); | |
2176 | prio = TC_H_MAJ(t->tcm_info); | |
2177 | parent = t->tcm_parent; | |
2178 | ||
2179 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
2180 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
2181 | return -ENOENT; | |
2182 | } | |
2183 | ||
2184 | /* Find head of filter chain. */ | |
2185 | ||
470502de VB |
2186 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2187 | if (err) | |
2188 | return err; | |
2189 | ||
6f96c3c6 CW |
2190 | if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
2191 | NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); | |
2192 | err = -EINVAL; | |
2193 | goto errout; | |
2194 | } | |
470502de VB |
2195 | /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc |
2196 | * found), qdisc is not unlocked, classifier type is not specified, | |
2197 | * classifier is not unlocked. | |
2198 | */ | |
2199 | if (!prio || | |
2200 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
6f96c3c6 | 2201 | !tcf_proto_is_unlocked(name)) { |
470502de VB |
2202 | rtnl_held = true; |
2203 | rtnl_lock(); | |
2204 | } | |
2205 | ||
2206 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2207 | if (err) | |
2208 | goto errout; | |
2209 | ||
2210 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2211 | extack); | |
c431f89b VB |
2212 | if (IS_ERR(block)) { |
2213 | err = PTR_ERR(block); | |
2214 | goto errout; | |
2215 | } | |
2216 | ||
2217 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2218 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2219 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2220 | err = -EINVAL; | |
2221 | goto errout; | |
2222 | } | |
2223 | chain = tcf_chain_get(block, chain_index, false); | |
2224 | if (!chain) { | |
5ca8a25c JP |
2225 | /* User requested flush on non-existent chain. Nothing to do, |
2226 | * so just return success. | |
2227 | */ | |
2228 | if (prio == 0) { | |
2229 | err = 0; | |
2230 | goto errout; | |
2231 | } | |
c431f89b | 2232 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
b7b4247d | 2233 | err = -ENOENT; |
c431f89b VB |
2234 | goto errout; |
2235 | } | |
2236 | ||
2237 | if (prio == 0) { | |
2238 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
12db03b6 VB |
2239 | chain, RTM_DELTFILTER, rtnl_held); |
2240 | tcf_chain_flush(chain, rtnl_held); | |
c431f89b VB |
2241 | err = 0; |
2242 | goto errout; | |
2243 | } | |
2244 | ||
ed76f5ed | 2245 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2246 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2247 | prio, false); | |
2248 | if (!tp || IS_ERR(tp)) { | |
2249 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2250 | err = tp ? PTR_ERR(tp) : -ENOENT; |
ed76f5ed | 2251 | goto errout_locked; |
c431f89b VB |
2252 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2253 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2254 | err = -EINVAL; | |
ed76f5ed VB |
2255 | goto errout_locked; |
2256 | } else if (t->tcm_handle == 0) { | |
59eb87cb | 2257 | tcf_proto_signal_destroying(chain, tp); |
ed76f5ed VB |
2258 | tcf_chain_tp_remove(chain, &chain_info, tp); |
2259 | mutex_unlock(&chain->filter_chain_lock); | |
2260 | ||
12db03b6 | 2261 | tcf_proto_put(tp, rtnl_held, NULL); |
ed76f5ed | 2262 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2263 | RTM_DELTFILTER, false, rtnl_held); |
ed76f5ed | 2264 | err = 0; |
c431f89b VB |
2265 | goto errout; |
2266 | } | |
ed76f5ed | 2267 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2268 | |
2269 | fh = tp->ops->get(tp, t->tcm_handle); | |
2270 | ||
2271 | if (!fh) { | |
ed76f5ed VB |
2272 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); |
2273 | err = -ENOENT; | |
c431f89b VB |
2274 | } else { |
2275 | bool last; | |
2276 | ||
2277 | err = tfilter_del_notify(net, skb, n, tp, block, | |
2278 | q, parent, fh, false, &last, | |
12db03b6 VB |
2279 | rtnl_held, extack); |
2280 | ||
c431f89b VB |
2281 | if (err) |
2282 | goto errout; | |
8b64678e | 2283 | if (last) |
12db03b6 | 2284 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack); |
c431f89b VB |
2285 | } |
2286 | ||
2287 | errout: | |
4dbfa766 VB |
2288 | if (chain) { |
2289 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2290 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2291 | tcf_chain_put(chain); |
4dbfa766 | 2292 | } |
12db03b6 | 2293 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2294 | |
2295 | if (rtnl_held) | |
2296 | rtnl_unlock(); | |
2297 | ||
c431f89b | 2298 | return err; |
ed76f5ed VB |
2299 | |
2300 | errout_locked: | |
2301 | mutex_unlock(&chain->filter_chain_lock); | |
2302 | goto errout; | |
c431f89b VB |
2303 | } |
2304 | ||
2305 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
2306 | struct netlink_ext_ack *extack) | |
2307 | { | |
2308 | struct net *net = sock_net(skb->sk); | |
2309 | struct nlattr *tca[TCA_MAX + 1]; | |
6f96c3c6 | 2310 | char name[IFNAMSIZ]; |
c431f89b VB |
2311 | struct tcmsg *t; |
2312 | u32 protocol; | |
2313 | u32 prio; | |
2314 | u32 parent; | |
2315 | u32 chain_index; | |
2316 | struct Qdisc *q = NULL; | |
2317 | struct tcf_chain_info chain_info; | |
2318 | struct tcf_chain *chain = NULL; | |
470502de | 2319 | struct tcf_block *block = NULL; |
c431f89b VB |
2320 | struct tcf_proto *tp = NULL; |
2321 | unsigned long cl = 0; | |
2322 | void *fh = NULL; | |
2323 | int err; | |
470502de | 2324 | bool rtnl_held = false; |
c431f89b | 2325 | |
8cb08174 JB |
2326 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2327 | rtm_tca_policy, extack); | |
c431f89b VB |
2328 | if (err < 0) |
2329 | return err; | |
2330 | ||
2331 | t = nlmsg_data(n); | |
2332 | protocol = TC_H_MIN(t->tcm_info); | |
2333 | prio = TC_H_MAJ(t->tcm_info); | |
2334 | parent = t->tcm_parent; | |
2335 | ||
2336 | if (prio == 0) { | |
2337 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
2338 | return -ENOENT; | |
2339 | } | |
2340 | ||
2341 | /* Find head of filter chain. */ | |
2342 | ||
470502de VB |
2343 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2344 | if (err) | |
2345 | return err; | |
2346 | ||
6f96c3c6 CW |
2347 | if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
2348 | NL_SET_ERR_MSG(extack, "Specified TC filter name too long"); | |
2349 | err = -EINVAL; | |
2350 | goto errout; | |
2351 | } | |
470502de VB |
2352 | /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not |
2353 | * unlocked, classifier type is not specified, classifier is not | |
2354 | * unlocked. | |
2355 | */ | |
2356 | if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
6f96c3c6 | 2357 | !tcf_proto_is_unlocked(name)) { |
470502de VB |
2358 | rtnl_held = true; |
2359 | rtnl_lock(); | |
2360 | } | |
2361 | ||
2362 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2363 | if (err) | |
2364 | goto errout; | |
2365 | ||
2366 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2367 | extack); | |
c431f89b VB |
2368 | if (IS_ERR(block)) { |
2369 | err = PTR_ERR(block); | |
2370 | goto errout; | |
2371 | } | |
2372 | ||
2373 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2374 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2375 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2376 | err = -EINVAL; | |
2377 | goto errout; | |
2378 | } | |
2379 | chain = tcf_chain_get(block, chain_index, false); | |
2380 | if (!chain) { | |
2381 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
2382 | err = -EINVAL; | |
2383 | goto errout; | |
2384 | } | |
2385 | ||
ed76f5ed | 2386 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2387 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2388 | prio, false); | |
ed76f5ed | 2389 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2390 | if (!tp || IS_ERR(tp)) { |
2391 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2392 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
2393 | goto errout; |
2394 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
2395 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2396 | err = -EINVAL; | |
2397 | goto errout; | |
2398 | } | |
2399 | ||
2400 | fh = tp->ops->get(tp, t->tcm_handle); | |
2401 | ||
2402 | if (!fh) { | |
2403 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
2404 | err = -ENOENT; | |
2405 | } else { | |
2406 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
12db03b6 | 2407 | fh, RTM_NEWTFILTER, true, rtnl_held); |
c431f89b VB |
2408 | if (err < 0) |
2409 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
2410 | } | |
2411 | ||
7d5509fa | 2412 | tfilter_put(tp, fh); |
c431f89b | 2413 | errout: |
4dbfa766 VB |
2414 | if (chain) { |
2415 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2416 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2417 | tcf_chain_put(chain); |
4dbfa766 | 2418 | } |
12db03b6 | 2419 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2420 | |
2421 | if (rtnl_held) | |
2422 | rtnl_unlock(); | |
2423 | ||
c431f89b VB |
2424 | return err; |
2425 | } | |
2426 | ||
aa767bfe | 2427 | struct tcf_dump_args { |
1da177e4 LT |
2428 | struct tcf_walker w; |
2429 | struct sk_buff *skb; | |
2430 | struct netlink_callback *cb; | |
7960d1da | 2431 | struct tcf_block *block; |
a10fa201 JP |
2432 | struct Qdisc *q; |
2433 | u32 parent; | |
1da177e4 LT |
2434 | }; |
2435 | ||
8113c095 | 2436 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 2437 | { |
aa767bfe | 2438 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 2439 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 2440 | |
7960d1da | 2441 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 2442 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 | 2443 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
12db03b6 | 2444 | RTM_NEWTFILTER, true); |
1da177e4 LT |
2445 | } |
2446 | ||
a10fa201 JP |
2447 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
2448 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
2449 | long index_start, long *p_index) |
2450 | { | |
2451 | struct net *net = sock_net(skb->sk); | |
7960d1da | 2452 | struct tcf_block *block = chain->block; |
acb31fae | 2453 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
fe2923af | 2454 | struct tcf_proto *tp, *tp_prev; |
acb31fae | 2455 | struct tcf_dump_args arg; |
acb31fae | 2456 | |
fe2923af VB |
2457 | for (tp = __tcf_get_next_proto(chain, NULL); |
2458 | tp; | |
2459 | tp_prev = tp, | |
2460 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 2461 | tcf_proto_put(tp_prev, true, NULL), |
fe2923af | 2462 | (*p_index)++) { |
acb31fae JP |
2463 | if (*p_index < index_start) |
2464 | continue; | |
2465 | if (TC_H_MAJ(tcm->tcm_info) && | |
2466 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
2467 | continue; | |
2468 | if (TC_H_MIN(tcm->tcm_info) && | |
2469 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
2470 | continue; | |
2471 | if (*p_index > index_start) | |
2472 | memset(&cb->args[1], 0, | |
2473 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2474 | if (cb->args[1] == 0) { | |
53189183 | 2475 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
2476 | NETLINK_CB(cb->skb).portid, |
2477 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
12db03b6 | 2478 | RTM_NEWTFILTER, true) <= 0) |
fe2923af | 2479 | goto errout; |
acb31fae JP |
2480 | cb->args[1] = 1; |
2481 | } | |
2482 | if (!tp->ops->walk) | |
2483 | continue; | |
2484 | arg.w.fn = tcf_node_dump; | |
2485 | arg.skb = skb; | |
2486 | arg.cb = cb; | |
7960d1da | 2487 | arg.block = block; |
a10fa201 JP |
2488 | arg.q = q; |
2489 | arg.parent = parent; | |
acb31fae JP |
2490 | arg.w.stop = 0; |
2491 | arg.w.skip = cb->args[1] - 1; | |
2492 | arg.w.count = 0; | |
01683a14 | 2493 | arg.w.cookie = cb->args[2]; |
12db03b6 | 2494 | tp->ops->walk(tp, &arg.w, true); |
01683a14 | 2495 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
2496 | cb->args[1] = arg.w.count + 1; |
2497 | if (arg.w.stop) | |
fe2923af | 2498 | goto errout; |
acb31fae | 2499 | } |
5bc17018 | 2500 | return true; |
fe2923af VB |
2501 | |
2502 | errout: | |
12db03b6 | 2503 | tcf_proto_put(tp, true, NULL); |
fe2923af | 2504 | return false; |
acb31fae JP |
2505 | } |
2506 | ||
bd27a875 | 2507 | /* called with RTNL */ |
1da177e4 LT |
2508 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
2509 | { | |
bbf73830 | 2510 | struct tcf_chain *chain, *chain_prev; |
3b1e0a65 | 2511 | struct net *net = sock_net(skb->sk); |
5bc17018 | 2512 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 2513 | struct Qdisc *q = NULL; |
6529eaba | 2514 | struct tcf_block *block; |
942b8165 | 2515 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
2516 | long index_start; |
2517 | long index; | |
a10fa201 | 2518 | u32 parent; |
5bc17018 | 2519 | int err; |
1da177e4 | 2520 | |
573ce260 | 2521 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2522 | return skb->len; |
5bc17018 | 2523 | |
8cb08174 JB |
2524 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2525 | NULL, cb->extack); | |
5bc17018 JP |
2526 | if (err) |
2527 | return err; | |
2528 | ||
7960d1da | 2529 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
787ce6d0 | 2530 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
7960d1da JP |
2531 | if (!block) |
2532 | goto out; | |
d680b352 JP |
2533 | /* If we work with block index, q is NULL and parent value |
2534 | * will never be used in the following code. The check | |
2535 | * in tcf_fill_node prevents it. However, compiler does not | |
2536 | * see that far, so set parent to zero to silence the warning | |
2537 | * about parent being uninitialized. | |
2538 | */ | |
2539 | parent = 0; | |
a10fa201 | 2540 | } else { |
7960d1da JP |
2541 | const struct Qdisc_class_ops *cops; |
2542 | struct net_device *dev; | |
2543 | unsigned long cl = 0; | |
2544 | ||
2545 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2546 | if (!dev) | |
2547 | return skb->len; | |
2548 | ||
2549 | parent = tcm->tcm_parent; | |
2550 | if (!parent) { | |
2551 | q = dev->qdisc; | |
2552 | parent = q->handle; | |
2553 | } else { | |
2554 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2555 | } | |
2556 | if (!q) | |
2557 | goto out; | |
2558 | cops = q->ops->cl_ops; | |
2559 | if (!cops) | |
143976ce | 2560 | goto out; |
7960d1da JP |
2561 | if (!cops->tcf_block) |
2562 | goto out; | |
2563 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2564 | cl = cops->find(q, tcm->tcm_parent); | |
2565 | if (cl == 0) | |
2566 | goto out; | |
2567 | } | |
2568 | block = cops->tcf_block(q, cl, NULL); | |
2569 | if (!block) | |
2570 | goto out; | |
2571 | if (tcf_block_shared(block)) | |
2572 | q = NULL; | |
1da177e4 | 2573 | } |
1da177e4 | 2574 | |
acb31fae JP |
2575 | index_start = cb->args[0]; |
2576 | index = 0; | |
5bc17018 | 2577 | |
bbf73830 VB |
2578 | for (chain = __tcf_get_next_chain(block, NULL); |
2579 | chain; | |
2580 | chain_prev = chain, | |
2581 | chain = __tcf_get_next_chain(block, chain), | |
2582 | tcf_chain_put(chain_prev)) { | |
5bc17018 JP |
2583 | if (tca[TCA_CHAIN] && |
2584 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
2585 | continue; | |
a10fa201 | 2586 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad | 2587 | index_start, &index)) { |
bbf73830 | 2588 | tcf_chain_put(chain); |
5ae437ad | 2589 | err = -EMSGSIZE; |
5bc17018 | 2590 | break; |
5ae437ad | 2591 | } |
5bc17018 JP |
2592 | } |
2593 | ||
787ce6d0 | 2594 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 2595 | tcf_block_refcnt_put(block, true); |
acb31fae | 2596 | cb->args[0] = index; |
1da177e4 | 2597 | |
1da177e4 | 2598 | out: |
5ae437ad RK |
2599 | /* If we did no progress, the error (EMSGSIZE) is real */ |
2600 | if (skb->len == 0 && err) | |
2601 | return err; | |
1da177e4 LT |
2602 | return skb->len; |
2603 | } | |
2604 | ||
a5654820 VB |
2605 | static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, |
2606 | void *tmplt_priv, u32 chain_index, | |
2607 | struct net *net, struct sk_buff *skb, | |
2608 | struct tcf_block *block, | |
32a4f5ec JP |
2609 | u32 portid, u32 seq, u16 flags, int event) |
2610 | { | |
2611 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 2612 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
2613 | struct nlmsghdr *nlh; |
2614 | struct tcmsg *tcm; | |
9f407f17 JP |
2615 | void *priv; |
2616 | ||
a5654820 VB |
2617 | ops = tmplt_ops; |
2618 | priv = tmplt_priv; | |
32a4f5ec JP |
2619 | |
2620 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
2621 | if (!nlh) | |
2622 | goto out_nlmsg_trim; | |
2623 | tcm = nlmsg_data(nlh); | |
2624 | tcm->tcm_family = AF_UNSPEC; | |
2625 | tcm->tcm__pad1 = 0; | |
2626 | tcm->tcm__pad2 = 0; | |
2627 | tcm->tcm_handle = 0; | |
2628 | if (block->q) { | |
2629 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
2630 | tcm->tcm_parent = block->q->handle; | |
2631 | } else { | |
2632 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
2633 | tcm->tcm_block_index = block->index; | |
2634 | } | |
2635 | ||
a5654820 | 2636 | if (nla_put_u32(skb, TCA_CHAIN, chain_index)) |
32a4f5ec JP |
2637 | goto nla_put_failure; |
2638 | ||
9f407f17 JP |
2639 | if (ops) { |
2640 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
2641 | goto nla_put_failure; | |
2642 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
2643 | goto nla_put_failure; | |
2644 | } | |
2645 | ||
32a4f5ec JP |
2646 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
2647 | return skb->len; | |
2648 | ||
2649 | out_nlmsg_trim: | |
2650 | nla_put_failure: | |
2651 | nlmsg_trim(skb, b); | |
2652 | return -EMSGSIZE; | |
2653 | } | |
2654 | ||
2655 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
2656 | u32 seq, u16 flags, int event, bool unicast) | |
2657 | { | |
2658 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2659 | struct tcf_block *block = chain->block; | |
2660 | struct net *net = block->net; | |
2661 | struct sk_buff *skb; | |
5b5f99b1 | 2662 | int err = 0; |
32a4f5ec JP |
2663 | |
2664 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2665 | if (!skb) | |
2666 | return -ENOBUFS; | |
2667 | ||
a5654820 VB |
2668 | if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
2669 | chain->index, net, skb, block, portid, | |
32a4f5ec JP |
2670 | seq, flags, event) <= 0) { |
2671 | kfree_skb(skb); | |
2672 | return -EINVAL; | |
2673 | } | |
2674 | ||
2675 | if (unicast) | |
5b5f99b1 ZW |
2676 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
2677 | else | |
2678 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
2679 | flags & NLM_F_ECHO); | |
32a4f5ec | 2680 | |
5b5f99b1 ZW |
2681 | if (err > 0) |
2682 | err = 0; | |
2683 | return err; | |
32a4f5ec JP |
2684 | } |
2685 | ||
a5654820 VB |
2686 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, |
2687 | void *tmplt_priv, u32 chain_index, | |
2688 | struct tcf_block *block, struct sk_buff *oskb, | |
2689 | u32 seq, u16 flags, bool unicast) | |
2690 | { | |
2691 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2692 | struct net *net = block->net; | |
2693 | struct sk_buff *skb; | |
2694 | ||
2695 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2696 | if (!skb) | |
2697 | return -ENOBUFS; | |
2698 | ||
2699 | if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb, | |
2700 | block, portid, seq, flags, RTM_DELCHAIN) <= 0) { | |
2701 | kfree_skb(skb); | |
2702 | return -EINVAL; | |
2703 | } | |
2704 | ||
2705 | if (unicast) | |
2706 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
2707 | ||
2708 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
2709 | } | |
2710 | ||
9f407f17 JP |
2711 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
2712 | struct nlattr **tca, | |
2713 | struct netlink_ext_ack *extack) | |
2714 | { | |
2715 | const struct tcf_proto_ops *ops; | |
2dd5616e | 2716 | char name[IFNAMSIZ]; |
9f407f17 JP |
2717 | void *tmplt_priv; |
2718 | ||
2719 | /* If kind is not set, user did not specify template. */ | |
2720 | if (!tca[TCA_KIND]) | |
2721 | return 0; | |
2722 | ||
2dd5616e ED |
2723 | if (tcf_proto_check_kind(tca[TCA_KIND], name)) { |
2724 | NL_SET_ERR_MSG(extack, "Specified TC chain template name too long"); | |
2725 | return -EINVAL; | |
2726 | } | |
2727 | ||
2728 | ops = tcf_proto_lookup_ops(name, true, extack); | |
9f407f17 JP |
2729 | if (IS_ERR(ops)) |
2730 | return PTR_ERR(ops); | |
2731 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
2732 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
2733 | return -EOPNOTSUPP; | |
2734 | } | |
2735 | ||
2736 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
2737 | if (IS_ERR(tmplt_priv)) { | |
2738 | module_put(ops->owner); | |
2739 | return PTR_ERR(tmplt_priv); | |
2740 | } | |
2741 | chain->tmplt_ops = ops; | |
2742 | chain->tmplt_priv = tmplt_priv; | |
2743 | return 0; | |
2744 | } | |
2745 | ||
a5654820 VB |
2746 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
2747 | void *tmplt_priv) | |
9f407f17 | 2748 | { |
9f407f17 | 2749 | /* If template ops are set, no work to do for us. */ |
a5654820 | 2750 | if (!tmplt_ops) |
9f407f17 JP |
2751 | return; |
2752 | ||
a5654820 VB |
2753 | tmplt_ops->tmplt_destroy(tmplt_priv); |
2754 | module_put(tmplt_ops->owner); | |
9f407f17 JP |
2755 | } |
2756 | ||
32a4f5ec JP |
2757 | /* Add/delete/get a chain */ |
2758 | ||
2759 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
2760 | struct netlink_ext_ack *extack) | |
2761 | { | |
2762 | struct net *net = sock_net(skb->sk); | |
2763 | struct nlattr *tca[TCA_MAX + 1]; | |
2764 | struct tcmsg *t; | |
2765 | u32 parent; | |
2766 | u32 chain_index; | |
2767 | struct Qdisc *q = NULL; | |
2768 | struct tcf_chain *chain = NULL; | |
2769 | struct tcf_block *block; | |
2770 | unsigned long cl; | |
2771 | int err; | |
2772 | ||
2773 | if (n->nlmsg_type != RTM_GETCHAIN && | |
2774 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2775 | return -EPERM; | |
2776 | ||
2777 | replay: | |
8cb08174 JB |
2778 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2779 | rtm_tca_policy, extack); | |
32a4f5ec JP |
2780 | if (err < 0) |
2781 | return err; | |
2782 | ||
2783 | t = nlmsg_data(n); | |
2784 | parent = t->tcm_parent; | |
2785 | cl = 0; | |
2786 | ||
2787 | block = tcf_block_find(net, &q, &parent, &cl, | |
2788 | t->tcm_ifindex, t->tcm_block_index, extack); | |
2789 | if (IS_ERR(block)) | |
2790 | return PTR_ERR(block); | |
2791 | ||
2792 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2793 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2794 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
e368fdb6 VB |
2795 | err = -EINVAL; |
2796 | goto errout_block; | |
32a4f5ec | 2797 | } |
2cbfab07 VB |
2798 | |
2799 | mutex_lock(&block->lock); | |
32a4f5ec JP |
2800 | chain = tcf_chain_lookup(block, chain_index); |
2801 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
2802 | if (chain) { | |
3d32f4c5 | 2803 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 2804 | /* The chain exists only because there is |
3d32f4c5 | 2805 | * some action referencing it. |
1f3ed383 JP |
2806 | */ |
2807 | tcf_chain_hold(chain); | |
2808 | } else { | |
2809 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
e368fdb6 | 2810 | err = -EEXIST; |
2cbfab07 | 2811 | goto errout_block_locked; |
1f3ed383 JP |
2812 | } |
2813 | } else { | |
2814 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
2815 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
e368fdb6 | 2816 | err = -ENOENT; |
2cbfab07 | 2817 | goto errout_block_locked; |
1f3ed383 JP |
2818 | } |
2819 | chain = tcf_chain_create(block, chain_index); | |
2820 | if (!chain) { | |
2821 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
e368fdb6 | 2822 | err = -ENOMEM; |
2cbfab07 | 2823 | goto errout_block_locked; |
1f3ed383 | 2824 | } |
32a4f5ec JP |
2825 | } |
2826 | } else { | |
3d32f4c5 | 2827 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec | 2828 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
e368fdb6 | 2829 | err = -EINVAL; |
2cbfab07 | 2830 | goto errout_block_locked; |
32a4f5ec JP |
2831 | } |
2832 | tcf_chain_hold(chain); | |
2833 | } | |
2834 | ||
2cbfab07 VB |
2835 | if (n->nlmsg_type == RTM_NEWCHAIN) { |
2836 | /* Modifying chain requires holding parent block lock. In case | |
2837 | * the chain was successfully added, take a reference to the | |
2838 | * chain. This ensures that an empty chain does not disappear at | |
2839 | * the end of this function. | |
2840 | */ | |
2841 | tcf_chain_hold(chain); | |
2842 | chain->explicitly_created = true; | |
2843 | } | |
2844 | mutex_unlock(&block->lock); | |
2845 | ||
32a4f5ec JP |
2846 | switch (n->nlmsg_type) { |
2847 | case RTM_NEWCHAIN: | |
9f407f17 | 2848 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
2cbfab07 VB |
2849 | if (err) { |
2850 | tcf_chain_put_explicitly_created(chain); | |
9f407f17 | 2851 | goto errout; |
2cbfab07 VB |
2852 | } |
2853 | ||
32a4f5ec JP |
2854 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
2855 | RTM_NEWCHAIN, false); | |
2856 | break; | |
2857 | case RTM_DELCHAIN: | |
f5b9bac7 | 2858 | tfilter_notify_chain(net, skb, block, q, parent, n, |
12db03b6 | 2859 | chain, RTM_DELTFILTER, true); |
32a4f5ec | 2860 | /* Flush the chain first as the user requested chain removal. */ |
12db03b6 | 2861 | tcf_chain_flush(chain, true); |
32a4f5ec JP |
2862 | /* In case the chain was successfully deleted, put a reference |
2863 | * to the chain previously taken during addition. | |
2864 | */ | |
2865 | tcf_chain_put_explicitly_created(chain); | |
2866 | break; | |
2867 | case RTM_GETCHAIN: | |
32a4f5ec JP |
2868 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
2869 | n->nlmsg_seq, n->nlmsg_type, true); | |
2870 | if (err < 0) | |
2871 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
2872 | break; | |
2873 | default: | |
2874 | err = -EOPNOTSUPP; | |
2875 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
2876 | goto errout; | |
2877 | } | |
2878 | ||
2879 | errout: | |
2880 | tcf_chain_put(chain); | |
e368fdb6 | 2881 | errout_block: |
12db03b6 | 2882 | tcf_block_release(q, block, true); |
32a4f5ec JP |
2883 | if (err == -EAGAIN) |
2884 | /* Replay the request. */ | |
2885 | goto replay; | |
2886 | return err; | |
2cbfab07 VB |
2887 | |
2888 | errout_block_locked: | |
2889 | mutex_unlock(&block->lock); | |
2890 | goto errout_block; | |
32a4f5ec JP |
2891 | } |
2892 | ||
2893 | /* called with RTNL */ | |
2894 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
2895 | { | |
2896 | struct net *net = sock_net(skb->sk); | |
2897 | struct nlattr *tca[TCA_MAX + 1]; | |
2898 | struct Qdisc *q = NULL; | |
2899 | struct tcf_block *block; | |
32a4f5ec | 2900 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
ace4a267 | 2901 | struct tcf_chain *chain; |
32a4f5ec JP |
2902 | long index_start; |
2903 | long index; | |
2904 | u32 parent; | |
2905 | int err; | |
2906 | ||
2907 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
2908 | return skb->len; | |
2909 | ||
8cb08174 JB |
2910 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2911 | rtm_tca_policy, cb->extack); | |
32a4f5ec JP |
2912 | if (err) |
2913 | return err; | |
2914 | ||
2915 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 2916 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
32a4f5ec JP |
2917 | if (!block) |
2918 | goto out; | |
2919 | /* If we work with block index, q is NULL and parent value | |
2920 | * will never be used in the following code. The check | |
2921 | * in tcf_fill_node prevents it. However, compiler does not | |
2922 | * see that far, so set parent to zero to silence the warning | |
2923 | * about parent being uninitialized. | |
2924 | */ | |
2925 | parent = 0; | |
2926 | } else { | |
2927 | const struct Qdisc_class_ops *cops; | |
2928 | struct net_device *dev; | |
2929 | unsigned long cl = 0; | |
2930 | ||
2931 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2932 | if (!dev) | |
2933 | return skb->len; | |
2934 | ||
2935 | parent = tcm->tcm_parent; | |
2936 | if (!parent) { | |
2937 | q = dev->qdisc; | |
2938 | parent = q->handle; | |
2939 | } else { | |
2940 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2941 | } | |
2942 | if (!q) | |
2943 | goto out; | |
2944 | cops = q->ops->cl_ops; | |
2945 | if (!cops) | |
2946 | goto out; | |
2947 | if (!cops->tcf_block) | |
2948 | goto out; | |
2949 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2950 | cl = cops->find(q, tcm->tcm_parent); | |
2951 | if (cl == 0) | |
2952 | goto out; | |
2953 | } | |
2954 | block = cops->tcf_block(q, cl, NULL); | |
2955 | if (!block) | |
2956 | goto out; | |
2957 | if (tcf_block_shared(block)) | |
2958 | q = NULL; | |
2959 | } | |
2960 | ||
2961 | index_start = cb->args[0]; | |
2962 | index = 0; | |
2963 | ||
ace4a267 VB |
2964 | mutex_lock(&block->lock); |
2965 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec JP |
2966 | if ((tca[TCA_CHAIN] && |
2967 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
2968 | continue; | |
2969 | if (index < index_start) { | |
2970 | index++; | |
2971 | continue; | |
2972 | } | |
ace4a267 VB |
2973 | if (tcf_chain_held_by_acts_only(chain)) |
2974 | continue; | |
a5654820 VB |
2975 | err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
2976 | chain->index, net, skb, block, | |
32a4f5ec JP |
2977 | NETLINK_CB(cb->skb).portid, |
2978 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
2979 | RTM_NEWCHAIN); | |
ace4a267 | 2980 | if (err <= 0) |
32a4f5ec JP |
2981 | break; |
2982 | index++; | |
2983 | } | |
ace4a267 | 2984 | mutex_unlock(&block->lock); |
32a4f5ec | 2985 | |
787ce6d0 | 2986 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 2987 | tcf_block_refcnt_put(block, true); |
32a4f5ec JP |
2988 | cb->args[0] = index; |
2989 | ||
2990 | out: | |
2991 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
2992 | if (skb->len == 0 && err) | |
2993 | return err; | |
2994 | return skb->len; | |
2995 | } | |
2996 | ||
18d0264f | 2997 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
2998 | { |
2999 | #ifdef CONFIG_NET_CLS_ACT | |
3d66b89c ED |
3000 | if (exts->actions) { |
3001 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); | |
3002 | kfree(exts->actions); | |
3003 | } | |
22dc13c8 | 3004 | exts->nr_actions = 0; |
1da177e4 LT |
3005 | #endif |
3006 | } | |
aa767bfe | 3007 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 3008 | |
c1b52739 | 3009 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 | 3010 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
ec6743a1 | 3011 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 3012 | { |
1da177e4 LT |
3013 | #ifdef CONFIG_NET_CLS_ACT |
3014 | { | |
1da177e4 | 3015 | struct tc_action *act; |
d04e6990 | 3016 | size_t attr_size = 0; |
1da177e4 | 3017 | |
5da57f42 | 3018 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
3019 | act = tcf_action_init_1(net, tp, tb[exts->police], |
3020 | rate_tlv, "police", ovr, | |
ec6743a1 VB |
3021 | TCA_ACT_BIND, rtnl_held, |
3022 | extack); | |
ab27cfb8 PM |
3023 | if (IS_ERR(act)) |
3024 | return PTR_ERR(act); | |
1da177e4 | 3025 | |
33be6271 | 3026 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
3027 | exts->actions[0] = act; |
3028 | exts->nr_actions = 1; | |
5da57f42 | 3029 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 3030 | int err; |
22dc13c8 | 3031 | |
9fb9f251 JP |
3032 | err = tcf_action_init(net, tp, tb[exts->action], |
3033 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
ec6743a1 VB |
3034 | exts->actions, &attr_size, |
3035 | rtnl_held, extack); | |
90b73b77 | 3036 | if (err < 0) |
33be6271 | 3037 | return err; |
90b73b77 | 3038 | exts->nr_actions = err; |
1da177e4 LT |
3039 | } |
3040 | } | |
1da177e4 | 3041 | #else |
5da57f42 | 3042 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
3043 | (exts->police && tb[exts->police])) { |
3044 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 3045 | return -EOPNOTSUPP; |
50a56190 | 3046 | } |
1da177e4 LT |
3047 | #endif |
3048 | ||
3049 | return 0; | |
3050 | } | |
aa767bfe | 3051 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 3052 | |
9b0d4446 | 3053 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
3054 | { |
3055 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
3056 | struct tcf_exts old = *dst; |
3057 | ||
9b0d4446 | 3058 | *dst = *src; |
22dc13c8 | 3059 | tcf_exts_destroy(&old); |
1da177e4 LT |
3060 | #endif |
3061 | } | |
aa767bfe | 3062 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 3063 | |
22dc13c8 WC |
3064 | #ifdef CONFIG_NET_CLS_ACT |
3065 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
3066 | { | |
3067 | if (exts->nr_actions == 0) | |
3068 | return NULL; | |
3069 | else | |
3070 | return exts->actions[0]; | |
3071 | } | |
3072 | #endif | |
33be6271 | 3073 | |
5da57f42 | 3074 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3075 | { |
3076 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
3077 | struct nlattr *nest; |
3078 | ||
978dfd8d | 3079 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
3080 | /* |
3081 | * again for backward compatible mode - we want | |
3082 | * to work with both old and new modes of entering | |
3083 | * tc data even if iproute2 was newer - jhs | |
3084 | */ | |
33be6271 | 3085 | if (exts->type != TCA_OLD_COMPAT) { |
ae0be8de | 3086 | nest = nla_nest_start_noflag(skb, exts->action); |
4b3550ef PM |
3087 | if (nest == NULL) |
3088 | goto nla_put_failure; | |
22dc13c8 | 3089 | |
90b73b77 | 3090 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 3091 | goto nla_put_failure; |
4b3550ef | 3092 | nla_nest_end(skb, nest); |
5da57f42 | 3093 | } else if (exts->police) { |
33be6271 | 3094 | struct tc_action *act = tcf_exts_first_act(exts); |
ae0be8de | 3095 | nest = nla_nest_start_noflag(skb, exts->police); |
63acd680 | 3096 | if (nest == NULL || !act) |
4b3550ef | 3097 | goto nla_put_failure; |
33be6271 | 3098 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 3099 | goto nla_put_failure; |
4b3550ef | 3100 | nla_nest_end(skb, nest); |
1da177e4 LT |
3101 | } |
3102 | } | |
1da177e4 | 3103 | return 0; |
9cc63db5 CW |
3104 | |
3105 | nla_put_failure: | |
3106 | nla_nest_cancel(skb, nest); | |
1da177e4 | 3107 | return -1; |
9cc63db5 CW |
3108 | #else |
3109 | return 0; | |
3110 | #endif | |
1da177e4 | 3111 | } |
aa767bfe | 3112 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 3113 | |
aa767bfe | 3114 | |
5da57f42 | 3115 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3116 | { |
3117 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 3118 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 3119 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 3120 | return -1; |
1da177e4 LT |
3121 | #endif |
3122 | return 0; | |
1da177e4 | 3123 | } |
aa767bfe | 3124 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 3125 | |
40119211 VB |
3126 | static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags) |
3127 | { | |
3128 | if (*flags & TCA_CLS_FLAGS_IN_HW) | |
3129 | return; | |
3130 | *flags |= TCA_CLS_FLAGS_IN_HW; | |
3131 | atomic_inc(&block->offloadcnt); | |
3132 | } | |
3133 | ||
3134 | static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags) | |
3135 | { | |
3136 | if (!(*flags & TCA_CLS_FLAGS_IN_HW)) | |
3137 | return; | |
3138 | *flags &= ~TCA_CLS_FLAGS_IN_HW; | |
3139 | atomic_dec(&block->offloadcnt); | |
3140 | } | |
3141 | ||
3142 | static void tc_cls_offload_cnt_update(struct tcf_block *block, | |
3143 | struct tcf_proto *tp, u32 *cnt, | |
3144 | u32 *flags, u32 diff, bool add) | |
3145 | { | |
3146 | lockdep_assert_held(&block->cb_lock); | |
3147 | ||
3148 | spin_lock(&tp->lock); | |
3149 | if (add) { | |
3150 | if (!*cnt) | |
3151 | tcf_block_offload_inc(block, flags); | |
3152 | *cnt += diff; | |
3153 | } else { | |
3154 | *cnt -= diff; | |
3155 | if (!*cnt) | |
3156 | tcf_block_offload_dec(block, flags); | |
3157 | } | |
3158 | spin_unlock(&tp->lock); | |
3159 | } | |
3160 | ||
3161 | static void | |
3162 | tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp, | |
3163 | u32 *cnt, u32 *flags) | |
3164 | { | |
3165 | lockdep_assert_held(&block->cb_lock); | |
3166 | ||
3167 | spin_lock(&tp->lock); | |
3168 | tcf_block_offload_dec(block, flags); | |
3169 | *cnt = 0; | |
3170 | spin_unlock(&tp->lock); | |
3171 | } | |
3172 | ||
3173 | static int | |
3174 | __tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
3175 | void *type_data, bool err_stop) | |
717503b9 | 3176 | { |
955bcb6e | 3177 | struct flow_block_cb *block_cb; |
aeb3fecd CW |
3178 | int ok_count = 0; |
3179 | int err; | |
3180 | ||
14bfb13f | 3181 | list_for_each_entry(block_cb, &block->flow_block.cb_list, list) { |
aeb3fecd CW |
3182 | err = block_cb->cb(type, type_data, block_cb->cb_priv); |
3183 | if (err) { | |
40119211 VB |
3184 | if (err_stop) |
3185 | return err; | |
aeb3fecd CW |
3186 | } else { |
3187 | ok_count++; | |
3188 | } | |
3189 | } | |
40119211 VB |
3190 | return ok_count; |
3191 | } | |
3192 | ||
3193 | int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
3194 | void *type_data, bool err_stop, bool rtnl_held) | |
3195 | { | |
11bd634d | 3196 | bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
40119211 VB |
3197 | int ok_count; |
3198 | ||
11bd634d VB |
3199 | retry: |
3200 | if (take_rtnl) | |
3201 | rtnl_lock(); | |
40119211 | 3202 | down_read(&block->cb_lock); |
11bd634d VB |
3203 | /* Need to obtain rtnl lock if block is bound to devs that require it. |
3204 | * In block bind code cb_lock is obtained while holding rtnl, so we must | |
3205 | * obtain the locks in same order here. | |
3206 | */ | |
3207 | if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { | |
3208 | up_read(&block->cb_lock); | |
3209 | take_rtnl = true; | |
3210 | goto retry; | |
3211 | } | |
3212 | ||
40119211 | 3213 | ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
11bd634d | 3214 | |
4f8116c8 | 3215 | up_read(&block->cb_lock); |
11bd634d VB |
3216 | if (take_rtnl) |
3217 | rtnl_unlock(); | |
aeb3fecd | 3218 | return ok_count; |
717503b9 JP |
3219 | } |
3220 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 3221 | |
40119211 VB |
3222 | /* Non-destructive filter add. If filter that wasn't already in hardware is |
3223 | * successfully offloaded, increment block offloads counter. On failure, | |
3224 | * previously offloaded filter is considered to be intact and offloads counter | |
3225 | * is not decremented. | |
3226 | */ | |
3227 | ||
3228 | int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp, | |
3229 | enum tc_setup_type type, void *type_data, bool err_stop, | |
3230 | u32 *flags, unsigned int *in_hw_count, bool rtnl_held) | |
3231 | { | |
11bd634d | 3232 | bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
40119211 VB |
3233 | int ok_count; |
3234 | ||
11bd634d VB |
3235 | retry: |
3236 | if (take_rtnl) | |
3237 | rtnl_lock(); | |
40119211 | 3238 | down_read(&block->cb_lock); |
11bd634d VB |
3239 | /* Need to obtain rtnl lock if block is bound to devs that require it. |
3240 | * In block bind code cb_lock is obtained while holding rtnl, so we must | |
3241 | * obtain the locks in same order here. | |
3242 | */ | |
3243 | if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { | |
3244 | up_read(&block->cb_lock); | |
3245 | take_rtnl = true; | |
3246 | goto retry; | |
3247 | } | |
3248 | ||
40119211 VB |
3249 | /* Make sure all netdevs sharing this block are offload-capable. */ |
3250 | if (block->nooffloaddevcnt && err_stop) { | |
3251 | ok_count = -EOPNOTSUPP; | |
3252 | goto err_unlock; | |
3253 | } | |
3254 | ||
3255 | ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); | |
a449a3e7 VB |
3256 | if (ok_count < 0) |
3257 | goto err_unlock; | |
3258 | ||
3259 | if (tp->ops->hw_add) | |
3260 | tp->ops->hw_add(tp, type_data); | |
40119211 VB |
3261 | if (ok_count > 0) |
3262 | tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, | |
3263 | ok_count, true); | |
3264 | err_unlock: | |
3265 | up_read(&block->cb_lock); | |
11bd634d VB |
3266 | if (take_rtnl) |
3267 | rtnl_unlock(); | |
40119211 VB |
3268 | return ok_count < 0 ? ok_count : 0; |
3269 | } | |
3270 | EXPORT_SYMBOL(tc_setup_cb_add); | |
3271 | ||
3272 | /* Destructive filter replace. If filter that wasn't already in hardware is | |
3273 | * successfully offloaded, increment block offload counter. On failure, | |
3274 | * previously offloaded filter is considered to be destroyed and offload counter | |
3275 | * is decremented. | |
3276 | */ | |
3277 | ||
3278 | int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp, | |
3279 | enum tc_setup_type type, void *type_data, bool err_stop, | |
3280 | u32 *old_flags, unsigned int *old_in_hw_count, | |
3281 | u32 *new_flags, unsigned int *new_in_hw_count, | |
3282 | bool rtnl_held) | |
3283 | { | |
11bd634d | 3284 | bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
40119211 VB |
3285 | int ok_count; |
3286 | ||
11bd634d VB |
3287 | retry: |
3288 | if (take_rtnl) | |
3289 | rtnl_lock(); | |
40119211 | 3290 | down_read(&block->cb_lock); |
11bd634d VB |
3291 | /* Need to obtain rtnl lock if block is bound to devs that require it. |
3292 | * In block bind code cb_lock is obtained while holding rtnl, so we must | |
3293 | * obtain the locks in same order here. | |
3294 | */ | |
3295 | if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { | |
3296 | up_read(&block->cb_lock); | |
3297 | take_rtnl = true; | |
3298 | goto retry; | |
3299 | } | |
3300 | ||
40119211 VB |
3301 | /* Make sure all netdevs sharing this block are offload-capable. */ |
3302 | if (block->nooffloaddevcnt && err_stop) { | |
3303 | ok_count = -EOPNOTSUPP; | |
3304 | goto err_unlock; | |
3305 | } | |
3306 | ||
3307 | tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags); | |
a449a3e7 VB |
3308 | if (tp->ops->hw_del) |
3309 | tp->ops->hw_del(tp, type_data); | |
40119211 VB |
3310 | |
3311 | ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); | |
a449a3e7 VB |
3312 | if (ok_count < 0) |
3313 | goto err_unlock; | |
3314 | ||
3315 | if (tp->ops->hw_add) | |
3316 | tp->ops->hw_add(tp, type_data); | |
40119211 | 3317 | if (ok_count > 0) |
a449a3e7 VB |
3318 | tc_cls_offload_cnt_update(block, tp, new_in_hw_count, |
3319 | new_flags, ok_count, true); | |
40119211 VB |
3320 | err_unlock: |
3321 | up_read(&block->cb_lock); | |
11bd634d VB |
3322 | if (take_rtnl) |
3323 | rtnl_unlock(); | |
40119211 VB |
3324 | return ok_count < 0 ? ok_count : 0; |
3325 | } | |
3326 | EXPORT_SYMBOL(tc_setup_cb_replace); | |
3327 | ||
3328 | /* Destroy filter and decrement block offload counter, if filter was previously | |
3329 | * offloaded. | |
3330 | */ | |
3331 | ||
3332 | int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp, | |
3333 | enum tc_setup_type type, void *type_data, bool err_stop, | |
3334 | u32 *flags, unsigned int *in_hw_count, bool rtnl_held) | |
3335 | { | |
11bd634d | 3336 | bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held; |
40119211 VB |
3337 | int ok_count; |
3338 | ||
11bd634d VB |
3339 | retry: |
3340 | if (take_rtnl) | |
3341 | rtnl_lock(); | |
40119211 | 3342 | down_read(&block->cb_lock); |
11bd634d VB |
3343 | /* Need to obtain rtnl lock if block is bound to devs that require it. |
3344 | * In block bind code cb_lock is obtained while holding rtnl, so we must | |
3345 | * obtain the locks in same order here. | |
3346 | */ | |
3347 | if (!rtnl_held && !take_rtnl && block->lockeddevcnt) { | |
3348 | up_read(&block->cb_lock); | |
3349 | take_rtnl = true; | |
3350 | goto retry; | |
3351 | } | |
3352 | ||
40119211 VB |
3353 | ok_count = __tc_setup_cb_call(block, type, type_data, err_stop); |
3354 | ||
3355 | tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags); | |
a449a3e7 VB |
3356 | if (tp->ops->hw_del) |
3357 | tp->ops->hw_del(tp, type_data); | |
3358 | ||
40119211 | 3359 | up_read(&block->cb_lock); |
11bd634d VB |
3360 | if (take_rtnl) |
3361 | rtnl_unlock(); | |
40119211 VB |
3362 | return ok_count < 0 ? ok_count : 0; |
3363 | } | |
3364 | EXPORT_SYMBOL(tc_setup_cb_destroy); | |
3365 | ||
3366 | int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp, | |
3367 | bool add, flow_setup_cb_t *cb, | |
3368 | enum tc_setup_type type, void *type_data, | |
3369 | void *cb_priv, u32 *flags, unsigned int *in_hw_count) | |
3370 | { | |
3371 | int err = cb(type, type_data, cb_priv); | |
3372 | ||
3373 | if (err) { | |
3374 | if (add && tc_skip_sw(*flags)) | |
3375 | return err; | |
3376 | } else { | |
3377 | tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1, | |
3378 | add); | |
3379 | } | |
3380 | ||
3381 | return 0; | |
3382 | } | |
3383 | EXPORT_SYMBOL(tc_setup_cb_reoffload); | |
3384 | ||
5a6ff4b1 VB |
3385 | void tc_cleanup_flow_action(struct flow_action *flow_action) |
3386 | { | |
3387 | struct flow_action_entry *entry; | |
3388 | int i; | |
3389 | ||
1158958a VB |
3390 | flow_action_for_each(i, entry, flow_action) |
3391 | if (entry->destructor) | |
3392 | entry->destructor(entry->destructor_priv); | |
5a6ff4b1 VB |
3393 | } |
3394 | EXPORT_SYMBOL(tc_cleanup_flow_action); | |
3395 | ||
1158958a VB |
3396 | static void tcf_mirred_get_dev(struct flow_action_entry *entry, |
3397 | const struct tc_action *act) | |
3398 | { | |
470d5060 VB |
3399 | #ifdef CONFIG_NET_CLS_ACT |
3400 | entry->dev = act->ops->get_dev(act, &entry->destructor); | |
1158958a VB |
3401 | if (!entry->dev) |
3402 | return; | |
1158958a | 3403 | entry->destructor_priv = entry->dev; |
470d5060 | 3404 | #endif |
1158958a VB |
3405 | } |
3406 | ||
3407 | static void tcf_tunnel_encap_put_tunnel(void *priv) | |
3408 | { | |
3409 | struct ip_tunnel_info *tunnel = priv; | |
3410 | ||
3411 | kfree(tunnel); | |
3412 | } | |
3413 | ||
3414 | static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry, | |
3415 | const struct tc_action *act) | |
3416 | { | |
3417 | entry->tunnel = tcf_tunnel_info_copy(act); | |
3418 | if (!entry->tunnel) | |
3419 | return -ENOMEM; | |
3420 | entry->destructor = tcf_tunnel_encap_put_tunnel; | |
3421 | entry->destructor_priv = entry->tunnel; | |
3422 | return 0; | |
3423 | } | |
3424 | ||
4a5da47d VB |
3425 | static void tcf_sample_get_group(struct flow_action_entry *entry, |
3426 | const struct tc_action *act) | |
3427 | { | |
3428 | #ifdef CONFIG_NET_CLS_ACT | |
3429 | entry->sample.psample_group = | |
3430 | act->ops->get_psample_group(act, &entry->destructor); | |
3431 | entry->destructor_priv = entry->sample.psample_group; | |
3432 | #endif | |
3433 | } | |
3434 | ||
3a7b6861 | 3435 | int tc_setup_flow_action(struct flow_action *flow_action, |
b15e7a6e | 3436 | const struct tcf_exts *exts) |
3a7b6861 | 3437 | { |
7a472814 | 3438 | struct tc_action *act; |
9838b20a | 3439 | int i, j, k, err = 0; |
3a7b6861 PNA |
3440 | |
3441 | if (!exts) | |
3442 | return 0; | |
3443 | ||
3444 | j = 0; | |
3445 | tcf_exts_for_each_action(i, act, exts) { | |
3446 | struct flow_action_entry *entry; | |
3447 | ||
3448 | entry = &flow_action->entries[j]; | |
7a472814 | 3449 | spin_lock_bh(&act->tcfa_lock); |
3a7b6861 PNA |
3450 | if (is_tcf_gact_ok(act)) { |
3451 | entry->id = FLOW_ACTION_ACCEPT; | |
3452 | } else if (is_tcf_gact_shot(act)) { | |
3453 | entry->id = FLOW_ACTION_DROP; | |
3454 | } else if (is_tcf_gact_trap(act)) { | |
3455 | entry->id = FLOW_ACTION_TRAP; | |
3456 | } else if (is_tcf_gact_goto_chain(act)) { | |
3457 | entry->id = FLOW_ACTION_GOTO; | |
3458 | entry->chain_index = tcf_gact_goto_chain_index(act); | |
3459 | } else if (is_tcf_mirred_egress_redirect(act)) { | |
3460 | entry->id = FLOW_ACTION_REDIRECT; | |
1158958a | 3461 | tcf_mirred_get_dev(entry, act); |
3a7b6861 PNA |
3462 | } else if (is_tcf_mirred_egress_mirror(act)) { |
3463 | entry->id = FLOW_ACTION_MIRRED; | |
1158958a | 3464 | tcf_mirred_get_dev(entry, act); |
48e584ac JH |
3465 | } else if (is_tcf_mirred_ingress_redirect(act)) { |
3466 | entry->id = FLOW_ACTION_REDIRECT_INGRESS; | |
1158958a | 3467 | tcf_mirred_get_dev(entry, act); |
48e584ac JH |
3468 | } else if (is_tcf_mirred_ingress_mirror(act)) { |
3469 | entry->id = FLOW_ACTION_MIRRED_INGRESS; | |
1158958a | 3470 | tcf_mirred_get_dev(entry, act); |
3a7b6861 PNA |
3471 | } else if (is_tcf_vlan(act)) { |
3472 | switch (tcf_vlan_action(act)) { | |
3473 | case TCA_VLAN_ACT_PUSH: | |
3474 | entry->id = FLOW_ACTION_VLAN_PUSH; | |
3475 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3476 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3477 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3478 | break; | |
3479 | case TCA_VLAN_ACT_POP: | |
3480 | entry->id = FLOW_ACTION_VLAN_POP; | |
3481 | break; | |
3482 | case TCA_VLAN_ACT_MODIFY: | |
3483 | entry->id = FLOW_ACTION_VLAN_MANGLE; | |
3484 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3485 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3486 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3487 | break; | |
3488 | default: | |
9838b20a | 3489 | err = -EOPNOTSUPP; |
7a472814 | 3490 | goto err_out_locked; |
3a7b6861 PNA |
3491 | } |
3492 | } else if (is_tcf_tunnel_set(act)) { | |
3493 | entry->id = FLOW_ACTION_TUNNEL_ENCAP; | |
1158958a VB |
3494 | err = tcf_tunnel_encap_get_tunnel(entry, act); |
3495 | if (err) | |
7a472814 | 3496 | goto err_out_locked; |
3a7b6861 PNA |
3497 | } else if (is_tcf_tunnel_release(act)) { |
3498 | entry->id = FLOW_ACTION_TUNNEL_DECAP; | |
3a7b6861 PNA |
3499 | } else if (is_tcf_pedit(act)) { |
3500 | for (k = 0; k < tcf_pedit_nkeys(act); k++) { | |
3501 | switch (tcf_pedit_cmd(act, k)) { | |
3502 | case TCA_PEDIT_KEY_EX_CMD_SET: | |
3503 | entry->id = FLOW_ACTION_MANGLE; | |
3504 | break; | |
3505 | case TCA_PEDIT_KEY_EX_CMD_ADD: | |
3506 | entry->id = FLOW_ACTION_ADD; | |
3507 | break; | |
3508 | default: | |
9838b20a | 3509 | err = -EOPNOTSUPP; |
7a472814 | 3510 | goto err_out_locked; |
3a7b6861 PNA |
3511 | } |
3512 | entry->mangle.htype = tcf_pedit_htype(act, k); | |
3513 | entry->mangle.mask = tcf_pedit_mask(act, k); | |
3514 | entry->mangle.val = tcf_pedit_val(act, k); | |
3515 | entry->mangle.offset = tcf_pedit_offset(act, k); | |
3516 | entry = &flow_action->entries[++j]; | |
3517 | } | |
3518 | } else if (is_tcf_csum(act)) { | |
3519 | entry->id = FLOW_ACTION_CSUM; | |
3520 | entry->csum_flags = tcf_csum_update_flags(act); | |
3521 | } else if (is_tcf_skbedit_mark(act)) { | |
3522 | entry->id = FLOW_ACTION_MARK; | |
3523 | entry->mark = tcf_skbedit_mark(act); | |
a7a7be60 PJV |
3524 | } else if (is_tcf_sample(act)) { |
3525 | entry->id = FLOW_ACTION_SAMPLE; | |
a7a7be60 PJV |
3526 | entry->sample.trunc_size = tcf_sample_trunc_size(act); |
3527 | entry->sample.truncate = tcf_sample_truncate(act); | |
3528 | entry->sample.rate = tcf_sample_rate(act); | |
4a5da47d | 3529 | tcf_sample_get_group(entry, act); |
8c8cfc6e PJV |
3530 | } else if (is_tcf_police(act)) { |
3531 | entry->id = FLOW_ACTION_POLICE; | |
3532 | entry->police.burst = tcf_police_tcfp_burst(act); | |
3533 | entry->police.rate_bytes_ps = | |
3534 | tcf_police_rate_bytes_ps(act); | |
b57dc7c1 PB |
3535 | } else if (is_tcf_ct(act)) { |
3536 | entry->id = FLOW_ACTION_CT; | |
3537 | entry->ct.action = tcf_ct_action(act); | |
3538 | entry->ct.zone = tcf_ct_zone(act); | |
6749d590 JH |
3539 | } else if (is_tcf_mpls(act)) { |
3540 | switch (tcf_mpls_action(act)) { | |
3541 | case TCA_MPLS_ACT_PUSH: | |
3542 | entry->id = FLOW_ACTION_MPLS_PUSH; | |
3543 | entry->mpls_push.proto = tcf_mpls_proto(act); | |
3544 | entry->mpls_push.label = tcf_mpls_label(act); | |
3545 | entry->mpls_push.tc = tcf_mpls_tc(act); | |
3546 | entry->mpls_push.bos = tcf_mpls_bos(act); | |
3547 | entry->mpls_push.ttl = tcf_mpls_ttl(act); | |
3548 | break; | |
3549 | case TCA_MPLS_ACT_POP: | |
3550 | entry->id = FLOW_ACTION_MPLS_POP; | |
3551 | entry->mpls_pop.proto = tcf_mpls_proto(act); | |
3552 | break; | |
3553 | case TCA_MPLS_ACT_MODIFY: | |
3554 | entry->id = FLOW_ACTION_MPLS_MANGLE; | |
3555 | entry->mpls_mangle.label = tcf_mpls_label(act); | |
3556 | entry->mpls_mangle.tc = tcf_mpls_tc(act); | |
3557 | entry->mpls_mangle.bos = tcf_mpls_bos(act); | |
3558 | entry->mpls_mangle.ttl = tcf_mpls_ttl(act); | |
3559 | break; | |
3560 | default: | |
7a472814 | 3561 | goto err_out_locked; |
6749d590 | 3562 | } |
fb1b775a JH |
3563 | } else if (is_tcf_skbedit_ptype(act)) { |
3564 | entry->id = FLOW_ACTION_PTYPE; | |
3565 | entry->ptype = tcf_skbedit_ptype(act); | |
3a7b6861 | 3566 | } else { |
9838b20a | 3567 | err = -EOPNOTSUPP; |
7a472814 | 3568 | goto err_out_locked; |
3a7b6861 | 3569 | } |
7a472814 | 3570 | spin_unlock_bh(&act->tcfa_lock); |
3a7b6861 PNA |
3571 | |
3572 | if (!is_tcf_pedit(act)) | |
3573 | j++; | |
3574 | } | |
9838b20a | 3575 | |
3a7b6861 | 3576 | err_out: |
5a6ff4b1 VB |
3577 | if (err) |
3578 | tc_cleanup_flow_action(flow_action); | |
3579 | ||
9838b20a | 3580 | return err; |
7a472814 VB |
3581 | err_out_locked: |
3582 | spin_unlock_bh(&act->tcfa_lock); | |
3583 | goto err_out; | |
3a7b6861 PNA |
3584 | } |
3585 | EXPORT_SYMBOL(tc_setup_flow_action); | |
3586 | ||
e3ab786b PNA |
3587 | unsigned int tcf_exts_num_actions(struct tcf_exts *exts) |
3588 | { | |
3589 | unsigned int num_acts = 0; | |
3590 | struct tc_action *act; | |
3591 | int i; | |
3592 | ||
3593 | tcf_exts_for_each_action(i, act, exts) { | |
3594 | if (is_tcf_pedit(act)) | |
3595 | num_acts += tcf_pedit_nkeys(act); | |
3596 | else | |
3597 | num_acts++; | |
3598 | } | |
3599 | return num_acts; | |
3600 | } | |
3601 | EXPORT_SYMBOL(tcf_exts_num_actions); | |
3602 | ||
48617387 JP |
3603 | static __net_init int tcf_net_init(struct net *net) |
3604 | { | |
3605 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3606 | ||
ab281629 | 3607 | spin_lock_init(&tn->idr_lock); |
48617387 JP |
3608 | idr_init(&tn->idr); |
3609 | return 0; | |
3610 | } | |
3611 | ||
3612 | static void __net_exit tcf_net_exit(struct net *net) | |
3613 | { | |
3614 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3615 | ||
3616 | idr_destroy(&tn->idr); | |
3617 | } | |
3618 | ||
3619 | static struct pernet_operations tcf_net_ops = { | |
3620 | .init = tcf_net_init, | |
3621 | .exit = tcf_net_exit, | |
3622 | .id = &tcf_net_id, | |
3623 | .size = sizeof(struct tcf_net), | |
3624 | }; | |
3625 | ||
25a443f7 JH |
3626 | static struct flow_indr_block_entry block_entry = { |
3627 | .cb = tc_indr_block_get_and_cmd, | |
3628 | .list = LIST_HEAD_INIT(block_entry.list), | |
1150ab0f | 3629 | }; |
3630 | ||
1da177e4 LT |
3631 | static int __init tc_filter_init(void) |
3632 | { | |
48617387 JP |
3633 | int err; |
3634 | ||
7aa0045d CW |
3635 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
3636 | if (!tc_filter_wq) | |
3637 | return -ENOMEM; | |
3638 | ||
48617387 JP |
3639 | err = register_pernet_subsys(&tcf_net_ops); |
3640 | if (err) | |
3641 | goto err_register_pernet_subsys; | |
3642 | ||
25a443f7 | 3643 | flow_indr_add_block_cb(&block_entry); |
1150ab0f | 3644 | |
470502de VB |
3645 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, |
3646 | RTNL_FLAG_DOIT_UNLOCKED); | |
3647 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, | |
3648 | RTNL_FLAG_DOIT_UNLOCKED); | |
c431f89b | 3649 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, |
470502de | 3650 | tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED); |
32a4f5ec JP |
3651 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
3652 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
3653 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
3654 | tc_dump_chain, 0); | |
1da177e4 | 3655 | |
1da177e4 | 3656 | return 0; |
48617387 JP |
3657 | |
3658 | err_register_pernet_subsys: | |
3659 | destroy_workqueue(tc_filter_wq); | |
3660 | return err; | |
1da177e4 LT |
3661 | } |
3662 | ||
3663 | subsys_initcall(tc_filter_init); |