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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/cls_api.c Packet classifier API. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
6 | * | |
7 | * Changes: | |
8 | * | |
9 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> | |
14 | #include <linux/kernel.h> | |
1da177e4 | 15 | #include <linux/string.h> |
1da177e4 | 16 | #include <linux/errno.h> |
33a48927 | 17 | #include <linux/err.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/kmod.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
48617387 | 22 | #include <linux/idr.h> |
7f76fa36 | 23 | #include <linux/rhashtable.h> |
b854272b DL |
24 | #include <net/net_namespace.h> |
25 | #include <net/sock.h> | |
dc5fc579 | 26 | #include <net/netlink.h> |
1da177e4 LT |
27 | #include <net/pkt_sched.h> |
28 | #include <net/pkt_cls.h> | |
e3ab786b | 29 | #include <net/tc_act/tc_pedit.h> |
3a7b6861 PNA |
30 | #include <net/tc_act/tc_mirred.h> |
31 | #include <net/tc_act/tc_vlan.h> | |
32 | #include <net/tc_act/tc_tunnel_key.h> | |
33 | #include <net/tc_act/tc_csum.h> | |
34 | #include <net/tc_act/tc_gact.h> | |
8c8cfc6e | 35 | #include <net/tc_act/tc_police.h> |
a7a7be60 | 36 | #include <net/tc_act/tc_sample.h> |
3a7b6861 | 37 | #include <net/tc_act/tc_skbedit.h> |
b57dc7c1 | 38 | #include <net/tc_act/tc_ct.h> |
1da177e4 | 39 | |
e331473f DC |
40 | extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; |
41 | ||
1da177e4 | 42 | /* The list of all installed classifier types */ |
36272874 | 43 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
44 | |
45 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
46 | static DEFINE_RWLOCK(cls_mod_lock); | |
47 | ||
48 | /* Find classifier type by string name */ | |
49 | ||
f34e8bff | 50 | static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 51 | { |
dcd76081 | 52 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
53 | |
54 | if (kind) { | |
55 | read_lock(&cls_mod_lock); | |
36272874 | 56 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 57 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
58 | if (try_module_get(t->owner)) |
59 | res = t; | |
1da177e4 LT |
60 | break; |
61 | } | |
62 | } | |
63 | read_unlock(&cls_mod_lock); | |
64 | } | |
dcd76081 | 65 | return res; |
1da177e4 LT |
66 | } |
67 | ||
f34e8bff | 68 | static const struct tcf_proto_ops * |
12db03b6 VB |
69 | tcf_proto_lookup_ops(const char *kind, bool rtnl_held, |
70 | struct netlink_ext_ack *extack) | |
f34e8bff JP |
71 | { |
72 | const struct tcf_proto_ops *ops; | |
73 | ||
74 | ops = __tcf_proto_lookup_ops(kind); | |
75 | if (ops) | |
76 | return ops; | |
77 | #ifdef CONFIG_MODULES | |
12db03b6 VB |
78 | if (rtnl_held) |
79 | rtnl_unlock(); | |
f34e8bff | 80 | request_module("cls_%s", kind); |
12db03b6 VB |
81 | if (rtnl_held) |
82 | rtnl_lock(); | |
f34e8bff JP |
83 | ops = __tcf_proto_lookup_ops(kind); |
84 | /* We dropped the RTNL semaphore in order to perform | |
85 | * the module load. So, even if we succeeded in loading | |
86 | * the module we have to replay the request. We indicate | |
87 | * this using -EAGAIN. | |
88 | */ | |
89 | if (ops) { | |
90 | module_put(ops->owner); | |
91 | return ERR_PTR(-EAGAIN); | |
92 | } | |
93 | #endif | |
94 | NL_SET_ERR_MSG(extack, "TC classifier not found"); | |
95 | return ERR_PTR(-ENOENT); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* Register(unregister) new classifier type */ |
99 | ||
100 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
101 | { | |
36272874 | 102 | struct tcf_proto_ops *t; |
1da177e4 LT |
103 | int rc = -EEXIST; |
104 | ||
105 | write_lock(&cls_mod_lock); | |
36272874 | 106 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
107 | if (!strcmp(ops->kind, t->kind)) |
108 | goto out; | |
109 | ||
36272874 | 110 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
111 | rc = 0; |
112 | out: | |
113 | write_unlock(&cls_mod_lock); | |
114 | return rc; | |
115 | } | |
aa767bfe | 116 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 117 | |
7aa0045d CW |
118 | static struct workqueue_struct *tc_filter_wq; |
119 | ||
1da177e4 LT |
120 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
121 | { | |
36272874 | 122 | struct tcf_proto_ops *t; |
1da177e4 LT |
123 | int rc = -ENOENT; |
124 | ||
c78e1746 DB |
125 | /* Wait for outstanding call_rcu()s, if any, from a |
126 | * tcf_proto_ops's destroy() handler. | |
127 | */ | |
128 | rcu_barrier(); | |
7aa0045d | 129 | flush_workqueue(tc_filter_wq); |
c78e1746 | 130 | |
1da177e4 | 131 | write_lock(&cls_mod_lock); |
dcd76081 ED |
132 | list_for_each_entry(t, &tcf_proto_base, head) { |
133 | if (t == ops) { | |
134 | list_del(&t->head); | |
135 | rc = 0; | |
1da177e4 | 136 | break; |
dcd76081 ED |
137 | } |
138 | } | |
1da177e4 LT |
139 | write_unlock(&cls_mod_lock); |
140 | return rc; | |
141 | } | |
aa767bfe | 142 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 143 | |
aaa908ff | 144 | bool tcf_queue_work(struct rcu_work *rwork, work_func_t func) |
7aa0045d | 145 | { |
aaa908ff CW |
146 | INIT_RCU_WORK(rwork, func); |
147 | return queue_rcu_work(tc_filter_wq, rwork); | |
7aa0045d CW |
148 | } |
149 | EXPORT_SYMBOL(tcf_queue_work); | |
150 | ||
1da177e4 LT |
151 | /* Select new prio value from the range, managed by kernel. */ |
152 | ||
aa767bfe | 153 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 154 | { |
aa767bfe | 155 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
156 | |
157 | if (tp) | |
cc7ec456 | 158 | first = tp->prio - 1; |
1da177e4 | 159 | |
7961973a | 160 | return TC_H_MAJ(first); |
1da177e4 LT |
161 | } |
162 | ||
470502de VB |
163 | static bool tcf_proto_is_unlocked(const char *kind) |
164 | { | |
165 | const struct tcf_proto_ops *ops; | |
166 | bool ret; | |
167 | ||
168 | ops = tcf_proto_lookup_ops(kind, false, NULL); | |
169 | /* On error return false to take rtnl lock. Proto lookup/create | |
170 | * functions will perform lookup again and properly handle errors. | |
171 | */ | |
172 | if (IS_ERR(ops)) | |
173 | return false; | |
174 | ||
175 | ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED); | |
176 | module_put(ops->owner); | |
177 | return ret; | |
178 | } | |
179 | ||
33a48927 | 180 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
c35a4acc | 181 | u32 prio, struct tcf_chain *chain, |
12db03b6 | 182 | bool rtnl_held, |
c35a4acc | 183 | struct netlink_ext_ack *extack) |
33a48927 JP |
184 | { |
185 | struct tcf_proto *tp; | |
186 | int err; | |
187 | ||
188 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
189 | if (!tp) | |
190 | return ERR_PTR(-ENOBUFS); | |
191 | ||
12db03b6 | 192 | tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack); |
f34e8bff JP |
193 | if (IS_ERR(tp->ops)) { |
194 | err = PTR_ERR(tp->ops); | |
d68d75fd | 195 | goto errout; |
33a48927 JP |
196 | } |
197 | tp->classify = tp->ops->classify; | |
198 | tp->protocol = protocol; | |
199 | tp->prio = prio; | |
5bc17018 | 200 | tp->chain = chain; |
8b64678e | 201 | spin_lock_init(&tp->lock); |
4dbfa766 | 202 | refcount_set(&tp->refcnt, 1); |
33a48927 JP |
203 | |
204 | err = tp->ops->init(tp); | |
205 | if (err) { | |
206 | module_put(tp->ops->owner); | |
207 | goto errout; | |
208 | } | |
209 | return tp; | |
210 | ||
211 | errout: | |
212 | kfree(tp); | |
213 | return ERR_PTR(err); | |
214 | } | |
215 | ||
4dbfa766 VB |
216 | static void tcf_proto_get(struct tcf_proto *tp) |
217 | { | |
218 | refcount_inc(&tp->refcnt); | |
219 | } | |
220 | ||
221 | static void tcf_chain_put(struct tcf_chain *chain); | |
222 | ||
12db03b6 | 223 | static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 224 | struct netlink_ext_ack *extack) |
cf1facda | 225 | { |
12db03b6 | 226 | tp->ops->destroy(tp, rtnl_held, extack); |
4dbfa766 | 227 | tcf_chain_put(tp->chain); |
763dbf63 WC |
228 | module_put(tp->ops->owner); |
229 | kfree_rcu(tp, rcu); | |
cf1facda JP |
230 | } |
231 | ||
12db03b6 | 232 | static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held, |
4dbfa766 VB |
233 | struct netlink_ext_ack *extack) |
234 | { | |
235 | if (refcount_dec_and_test(&tp->refcnt)) | |
12db03b6 | 236 | tcf_proto_destroy(tp, rtnl_held, extack); |
4dbfa766 VB |
237 | } |
238 | ||
268a351d | 239 | static int walker_check_empty(struct tcf_proto *tp, void *fh, |
6676d5e4 | 240 | struct tcf_walker *arg) |
8b64678e | 241 | { |
268a351d | 242 | if (fh) { |
6676d5e4 VB |
243 | arg->nonempty = true; |
244 | return -1; | |
245 | } | |
246 | return 0; | |
8b64678e VB |
247 | } |
248 | ||
12db03b6 | 249 | static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held) |
8b64678e | 250 | { |
6676d5e4 | 251 | struct tcf_walker walker = { .fn = walker_check_empty, }; |
8b64678e VB |
252 | |
253 | if (tp->ops->walk) { | |
12db03b6 | 254 | tp->ops->walk(tp, &walker, rtnl_held); |
6676d5e4 | 255 | return !walker.nonempty; |
8b64678e VB |
256 | } |
257 | return true; | |
258 | } | |
259 | ||
12db03b6 | 260 | static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held) |
8b64678e VB |
261 | { |
262 | spin_lock(&tp->lock); | |
12db03b6 | 263 | if (tcf_proto_is_empty(tp, rtnl_held)) |
8b64678e VB |
264 | tp->deleting = true; |
265 | spin_unlock(&tp->lock); | |
266 | return tp->deleting; | |
267 | } | |
268 | ||
269 | static void tcf_proto_mark_delete(struct tcf_proto *tp) | |
270 | { | |
271 | spin_lock(&tp->lock); | |
272 | tp->deleting = true; | |
273 | spin_unlock(&tp->lock); | |
274 | } | |
275 | ||
276 | static bool tcf_proto_is_deleting(struct tcf_proto *tp) | |
277 | { | |
278 | bool deleting; | |
279 | ||
280 | spin_lock(&tp->lock); | |
281 | deleting = tp->deleting; | |
282 | spin_unlock(&tp->lock); | |
283 | ||
284 | return deleting; | |
285 | } | |
286 | ||
c266f64d VB |
287 | #define ASSERT_BLOCK_LOCKED(block) \ |
288 | lockdep_assert_held(&(block)->lock) | |
289 | ||
a9b19443 JP |
290 | struct tcf_filter_chain_list_item { |
291 | struct list_head list; | |
292 | tcf_chain_head_change_t *chain_head_change; | |
293 | void *chain_head_change_priv; | |
294 | }; | |
295 | ||
5bc17018 JP |
296 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
297 | u32 chain_index) | |
2190d1d0 | 298 | { |
5bc17018 JP |
299 | struct tcf_chain *chain; |
300 | ||
c266f64d VB |
301 | ASSERT_BLOCK_LOCKED(block); |
302 | ||
5bc17018 JP |
303 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); |
304 | if (!chain) | |
305 | return NULL; | |
306 | list_add_tail(&chain->list, &block->chain_list); | |
ed76f5ed | 307 | mutex_init(&chain->filter_chain_lock); |
5bc17018 JP |
308 | chain->block = block; |
309 | chain->index = chain_index; | |
e2ef7544 | 310 | chain->refcnt = 1; |
f71e0ca4 JP |
311 | if (!chain->index) |
312 | block->chain0.chain = chain; | |
5bc17018 | 313 | return chain; |
2190d1d0 JP |
314 | } |
315 | ||
a9b19443 JP |
316 | static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item, |
317 | struct tcf_proto *tp_head) | |
318 | { | |
319 | if (item->chain_head_change) | |
320 | item->chain_head_change(tp_head, item->chain_head_change_priv); | |
321 | } | |
f71e0ca4 JP |
322 | |
323 | static void tcf_chain0_head_change(struct tcf_chain *chain, | |
324 | struct tcf_proto *tp_head) | |
c7eb7d72 | 325 | { |
a9b19443 | 326 | struct tcf_filter_chain_list_item *item; |
f71e0ca4 | 327 | struct tcf_block *block = chain->block; |
a9b19443 | 328 | |
f71e0ca4 JP |
329 | if (chain->index) |
330 | return; | |
165f0135 VB |
331 | |
332 | mutex_lock(&block->lock); | |
f71e0ca4 | 333 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) |
a9b19443 | 334 | tcf_chain_head_change_item(item, tp_head); |
165f0135 | 335 | mutex_unlock(&block->lock); |
c7eb7d72 JP |
336 | } |
337 | ||
c266f64d VB |
338 | /* Returns true if block can be safely freed. */ |
339 | ||
340 | static bool tcf_chain_detach(struct tcf_chain *chain) | |
f93e1cdc | 341 | { |
efbf7897 CW |
342 | struct tcf_block *block = chain->block; |
343 | ||
c266f64d VB |
344 | ASSERT_BLOCK_LOCKED(block); |
345 | ||
e2ef7544 | 346 | list_del(&chain->list); |
f71e0ca4 JP |
347 | if (!chain->index) |
348 | block->chain0.chain = NULL; | |
c266f64d VB |
349 | |
350 | if (list_empty(&block->chain_list) && | |
351 | refcount_read(&block->refcnt) == 0) | |
352 | return true; | |
353 | ||
354 | return false; | |
355 | } | |
356 | ||
357 | static void tcf_block_destroy(struct tcf_block *block) | |
358 | { | |
359 | mutex_destroy(&block->lock); | |
360 | kfree_rcu(block, rcu); | |
361 | } | |
362 | ||
363 | static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block) | |
364 | { | |
365 | struct tcf_block *block = chain->block; | |
366 | ||
ed76f5ed | 367 | mutex_destroy(&chain->filter_chain_lock); |
ee3bbfe8 | 368 | kfree_rcu(chain, rcu); |
c266f64d VB |
369 | if (free_block) |
370 | tcf_block_destroy(block); | |
e2ef7544 | 371 | } |
744a4cf6 | 372 | |
e2ef7544 CW |
373 | static void tcf_chain_hold(struct tcf_chain *chain) |
374 | { | |
c266f64d VB |
375 | ASSERT_BLOCK_LOCKED(chain->block); |
376 | ||
e2ef7544 | 377 | ++chain->refcnt; |
2190d1d0 JP |
378 | } |
379 | ||
3d32f4c5 | 380 | static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain) |
1f3ed383 | 381 | { |
c266f64d VB |
382 | ASSERT_BLOCK_LOCKED(chain->block); |
383 | ||
1f3ed383 | 384 | /* In case all the references are action references, this |
3d32f4c5 | 385 | * chain should not be shown to the user. |
1f3ed383 JP |
386 | */ |
387 | return chain->refcnt == chain->action_refcnt; | |
388 | } | |
389 | ||
32a4f5ec JP |
390 | static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block, |
391 | u32 chain_index) | |
5bc17018 JP |
392 | { |
393 | struct tcf_chain *chain; | |
394 | ||
c266f64d VB |
395 | ASSERT_BLOCK_LOCKED(block); |
396 | ||
5bc17018 | 397 | list_for_each_entry(chain, &block->chain_list, list) { |
32a4f5ec | 398 | if (chain->index == chain_index) |
e2ef7544 | 399 | return chain; |
32a4f5ec JP |
400 | } |
401 | return NULL; | |
402 | } | |
403 | ||
404 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
405 | u32 seq, u16 flags, int event, bool unicast); | |
406 | ||
53681407 JP |
407 | static struct tcf_chain *__tcf_chain_get(struct tcf_block *block, |
408 | u32 chain_index, bool create, | |
409 | bool by_act) | |
32a4f5ec | 410 | { |
c266f64d VB |
411 | struct tcf_chain *chain = NULL; |
412 | bool is_first_reference; | |
32a4f5ec | 413 | |
c266f64d VB |
414 | mutex_lock(&block->lock); |
415 | chain = tcf_chain_lookup(block, chain_index); | |
32a4f5ec JP |
416 | if (chain) { |
417 | tcf_chain_hold(chain); | |
53681407 JP |
418 | } else { |
419 | if (!create) | |
c266f64d | 420 | goto errout; |
53681407 JP |
421 | chain = tcf_chain_create(block, chain_index); |
422 | if (!chain) | |
c266f64d | 423 | goto errout; |
5bc17018 | 424 | } |
80532384 | 425 | |
53681407 JP |
426 | if (by_act) |
427 | ++chain->action_refcnt; | |
c266f64d VB |
428 | is_first_reference = chain->refcnt - chain->action_refcnt == 1; |
429 | mutex_unlock(&block->lock); | |
53681407 JP |
430 | |
431 | /* Send notification only in case we got the first | |
432 | * non-action reference. Until then, the chain acts only as | |
433 | * a placeholder for actions pointing to it and user ought | |
434 | * not know about them. | |
435 | */ | |
c266f64d | 436 | if (is_first_reference && !by_act) |
53681407 JP |
437 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
438 | RTM_NEWCHAIN, false); | |
439 | ||
32a4f5ec | 440 | return chain; |
c266f64d VB |
441 | |
442 | errout: | |
443 | mutex_unlock(&block->lock); | |
444 | return chain; | |
5bc17018 | 445 | } |
53681407 | 446 | |
290b1c8b JP |
447 | static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
448 | bool create) | |
53681407 JP |
449 | { |
450 | return __tcf_chain_get(block, chain_index, create, false); | |
451 | } | |
5bc17018 | 452 | |
1f3ed383 JP |
453 | struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index) |
454 | { | |
53681407 | 455 | return __tcf_chain_get(block, chain_index, true, true); |
1f3ed383 JP |
456 | } |
457 | EXPORT_SYMBOL(tcf_chain_get_by_act); | |
458 | ||
a5654820 VB |
459 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
460 | void *tmplt_priv); | |
461 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, | |
462 | void *tmplt_priv, u32 chain_index, | |
463 | struct tcf_block *block, struct sk_buff *oskb, | |
464 | u32 seq, u16 flags, bool unicast); | |
9f407f17 | 465 | |
91052fa1 VB |
466 | static void __tcf_chain_put(struct tcf_chain *chain, bool by_act, |
467 | bool explicitly_created) | |
5bc17018 | 468 | { |
c266f64d | 469 | struct tcf_block *block = chain->block; |
a5654820 | 470 | const struct tcf_proto_ops *tmplt_ops; |
b62989fc | 471 | bool free_block = false; |
c266f64d | 472 | unsigned int refcnt; |
a5654820 | 473 | void *tmplt_priv; |
c266f64d VB |
474 | |
475 | mutex_lock(&block->lock); | |
91052fa1 VB |
476 | if (explicitly_created) { |
477 | if (!chain->explicitly_created) { | |
478 | mutex_unlock(&block->lock); | |
479 | return; | |
480 | } | |
481 | chain->explicitly_created = false; | |
482 | } | |
483 | ||
53681407 JP |
484 | if (by_act) |
485 | chain->action_refcnt--; | |
c266f64d VB |
486 | |
487 | /* tc_chain_notify_delete can't be called while holding block lock. | |
488 | * However, when block is unlocked chain can be changed concurrently, so | |
489 | * save these to temporary variables. | |
490 | */ | |
491 | refcnt = --chain->refcnt; | |
a5654820 VB |
492 | tmplt_ops = chain->tmplt_ops; |
493 | tmplt_priv = chain->tmplt_priv; | |
53681407 JP |
494 | |
495 | /* The last dropped non-action reference will trigger notification. */ | |
b62989fc VB |
496 | if (refcnt - chain->action_refcnt == 0 && !by_act) { |
497 | tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index, | |
a5654820 | 498 | block, NULL, 0, 0, false); |
726d0612 VB |
499 | /* Last reference to chain, no need to lock. */ |
500 | chain->flushing = false; | |
501 | } | |
53681407 | 502 | |
b62989fc VB |
503 | if (refcnt == 0) |
504 | free_block = tcf_chain_detach(chain); | |
505 | mutex_unlock(&block->lock); | |
506 | ||
c266f64d | 507 | if (refcnt == 0) { |
a5654820 | 508 | tc_chain_tmplt_del(tmplt_ops, tmplt_priv); |
c266f64d | 509 | tcf_chain_destroy(chain, free_block); |
32a4f5ec | 510 | } |
5bc17018 | 511 | } |
53681407 | 512 | |
290b1c8b | 513 | static void tcf_chain_put(struct tcf_chain *chain) |
53681407 | 514 | { |
91052fa1 | 515 | __tcf_chain_put(chain, false, false); |
53681407 | 516 | } |
5bc17018 | 517 | |
1f3ed383 JP |
518 | void tcf_chain_put_by_act(struct tcf_chain *chain) |
519 | { | |
91052fa1 | 520 | __tcf_chain_put(chain, true, false); |
1f3ed383 JP |
521 | } |
522 | EXPORT_SYMBOL(tcf_chain_put_by_act); | |
523 | ||
32a4f5ec JP |
524 | static void tcf_chain_put_explicitly_created(struct tcf_chain *chain) |
525 | { | |
91052fa1 | 526 | __tcf_chain_put(chain, false, true); |
32a4f5ec JP |
527 | } |
528 | ||
12db03b6 | 529 | static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held) |
290b1c8b | 530 | { |
4dbfa766 | 531 | struct tcf_proto *tp, *tp_next; |
290b1c8b | 532 | |
ed76f5ed VB |
533 | mutex_lock(&chain->filter_chain_lock); |
534 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
4dbfa766 | 535 | RCU_INIT_POINTER(chain->filter_chain, NULL); |
290b1c8b | 536 | tcf_chain0_head_change(chain, NULL); |
726d0612 | 537 | chain->flushing = true; |
ed76f5ed VB |
538 | mutex_unlock(&chain->filter_chain_lock); |
539 | ||
290b1c8b | 540 | while (tp) { |
4dbfa766 | 541 | tp_next = rcu_dereference_protected(tp->next, 1); |
12db03b6 | 542 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 | 543 | tp = tp_next; |
290b1c8b JP |
544 | } |
545 | } | |
546 | ||
7f76fa36 JH |
547 | static struct tcf_block *tc_dev_ingress_block(struct net_device *dev) |
548 | { | |
549 | const struct Qdisc_class_ops *cops; | |
550 | struct Qdisc *qdisc; | |
551 | ||
552 | if (!dev_ingress_queue(dev)) | |
553 | return NULL; | |
554 | ||
555 | qdisc = dev_ingress_queue(dev)->qdisc_sleeping; | |
556 | if (!qdisc) | |
557 | return NULL; | |
558 | ||
559 | cops = qdisc->ops->cl_ops; | |
560 | if (!cops) | |
561 | return NULL; | |
562 | ||
563 | if (!cops->tcf_block) | |
564 | return NULL; | |
565 | ||
566 | return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL); | |
567 | } | |
568 | ||
569 | static struct rhashtable indr_setup_block_ht; | |
570 | ||
571 | struct tc_indr_block_dev { | |
572 | struct rhash_head ht_node; | |
573 | struct net_device *dev; | |
574 | unsigned int refcnt; | |
575 | struct list_head cb_list; | |
576 | struct tcf_block *block; | |
577 | }; | |
578 | ||
579 | struct tc_indr_block_cb { | |
580 | struct list_head list; | |
581 | void *cb_priv; | |
582 | tc_indr_block_bind_cb_t *cb; | |
583 | void *cb_ident; | |
584 | }; | |
585 | ||
586 | static const struct rhashtable_params tc_indr_setup_block_ht_params = { | |
587 | .key_offset = offsetof(struct tc_indr_block_dev, dev), | |
588 | .head_offset = offsetof(struct tc_indr_block_dev, ht_node), | |
589 | .key_len = sizeof(struct net_device *), | |
590 | }; | |
591 | ||
592 | static struct tc_indr_block_dev * | |
593 | tc_indr_block_dev_lookup(struct net_device *dev) | |
594 | { | |
595 | return rhashtable_lookup_fast(&indr_setup_block_ht, &dev, | |
596 | tc_indr_setup_block_ht_params); | |
597 | } | |
598 | ||
599 | static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev) | |
600 | { | |
601 | struct tc_indr_block_dev *indr_dev; | |
602 | ||
603 | indr_dev = tc_indr_block_dev_lookup(dev); | |
604 | if (indr_dev) | |
605 | goto inc_ref; | |
606 | ||
607 | indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL); | |
608 | if (!indr_dev) | |
609 | return NULL; | |
610 | ||
611 | INIT_LIST_HEAD(&indr_dev->cb_list); | |
612 | indr_dev->dev = dev; | |
613 | indr_dev->block = tc_dev_ingress_block(dev); | |
614 | if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
615 | tc_indr_setup_block_ht_params)) { | |
616 | kfree(indr_dev); | |
617 | return NULL; | |
618 | } | |
619 | ||
620 | inc_ref: | |
621 | indr_dev->refcnt++; | |
622 | return indr_dev; | |
623 | } | |
624 | ||
625 | static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev) | |
626 | { | |
627 | if (--indr_dev->refcnt) | |
628 | return; | |
629 | ||
630 | rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node, | |
631 | tc_indr_setup_block_ht_params); | |
632 | kfree(indr_dev); | |
633 | } | |
634 | ||
635 | static struct tc_indr_block_cb * | |
636 | tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev, | |
637 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
638 | { | |
639 | struct tc_indr_block_cb *indr_block_cb; | |
640 | ||
641 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
642 | if (indr_block_cb->cb == cb && | |
643 | indr_block_cb->cb_ident == cb_ident) | |
644 | return indr_block_cb; | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | static struct tc_indr_block_cb * | |
649 | tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv, | |
650 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
651 | { | |
652 | struct tc_indr_block_cb *indr_block_cb; | |
653 | ||
654 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
655 | if (indr_block_cb) | |
656 | return ERR_PTR(-EEXIST); | |
657 | ||
658 | indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL); | |
659 | if (!indr_block_cb) | |
660 | return ERR_PTR(-ENOMEM); | |
661 | ||
662 | indr_block_cb->cb_priv = cb_priv; | |
663 | indr_block_cb->cb = cb; | |
664 | indr_block_cb->cb_ident = cb_ident; | |
665 | list_add(&indr_block_cb->list, &indr_dev->cb_list); | |
666 | ||
667 | return indr_block_cb; | |
668 | } | |
669 | ||
670 | static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb) | |
671 | { | |
672 | list_del(&indr_block_cb->list); | |
673 | kfree(indr_block_cb); | |
674 | } | |
675 | ||
59094b1e PNA |
676 | static int tcf_block_setup(struct tcf_block *block, |
677 | struct flow_block_offload *bo); | |
678 | ||
7f76fa36 JH |
679 | static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev, |
680 | struct tc_indr_block_cb *indr_block_cb, | |
9c0e189e | 681 | enum flow_block_command command) |
7f76fa36 | 682 | { |
955bcb6e | 683 | struct flow_block_offload bo = { |
7f76fa36 | 684 | .command = command, |
32f8c409 | 685 | .binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS, |
da3eeb90 | 686 | .net = dev_net(indr_dev->dev), |
c1a970d0 | 687 | .block_shared = tcf_block_non_null_shared(indr_dev->block), |
7f76fa36 | 688 | }; |
59094b1e | 689 | INIT_LIST_HEAD(&bo.cb_list); |
7f76fa36 JH |
690 | |
691 | if (!indr_dev->block) | |
692 | return; | |
693 | ||
14bfb13f PNA |
694 | bo.block = &indr_dev->block->flow_block; |
695 | ||
7f76fa36 JH |
696 | indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, |
697 | &bo); | |
59094b1e | 698 | tcf_block_setup(indr_dev->block, &bo); |
7f76fa36 JH |
699 | } |
700 | ||
701 | int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
702 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
703 | { | |
704 | struct tc_indr_block_cb *indr_block_cb; | |
705 | struct tc_indr_block_dev *indr_dev; | |
706 | int err; | |
707 | ||
708 | indr_dev = tc_indr_block_dev_get(dev); | |
709 | if (!indr_dev) | |
710 | return -ENOMEM; | |
711 | ||
712 | indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident); | |
713 | err = PTR_ERR_OR_ZERO(indr_block_cb); | |
714 | if (err) | |
715 | goto err_dev_put; | |
716 | ||
9c0e189e | 717 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, FLOW_BLOCK_BIND); |
7f76fa36 JH |
718 | return 0; |
719 | ||
720 | err_dev_put: | |
721 | tc_indr_block_dev_put(indr_dev); | |
722 | return err; | |
723 | } | |
724 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register); | |
725 | ||
726 | int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv, | |
727 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
728 | { | |
729 | int err; | |
730 | ||
731 | rtnl_lock(); | |
732 | err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident); | |
733 | rtnl_unlock(); | |
734 | ||
735 | return err; | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_register); | |
738 | ||
739 | void __tc_indr_block_cb_unregister(struct net_device *dev, | |
740 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
741 | { | |
742 | struct tc_indr_block_cb *indr_block_cb; | |
743 | struct tc_indr_block_dev *indr_dev; | |
744 | ||
745 | indr_dev = tc_indr_block_dev_lookup(dev); | |
746 | if (!indr_dev) | |
747 | return; | |
748 | ||
749 | indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident); | |
750 | if (!indr_block_cb) | |
751 | return; | |
752 | ||
753 | /* Send unbind message if required to free any block cbs. */ | |
9c0e189e | 754 | tc_indr_block_ing_cmd(indr_dev, indr_block_cb, FLOW_BLOCK_UNBIND); |
7f76fa36 JH |
755 | tc_indr_block_cb_del(indr_block_cb); |
756 | tc_indr_block_dev_put(indr_dev); | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister); | |
759 | ||
760 | void tc_indr_block_cb_unregister(struct net_device *dev, | |
761 | tc_indr_block_bind_cb_t *cb, void *cb_ident) | |
762 | { | |
763 | rtnl_lock(); | |
764 | __tc_indr_block_cb_unregister(dev, cb, cb_ident); | |
765 | rtnl_unlock(); | |
766 | } | |
767 | EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister); | |
768 | ||
769 | static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev, | |
770 | struct tcf_block_ext_info *ei, | |
9c0e189e | 771 | enum flow_block_command command, |
7f76fa36 JH |
772 | struct netlink_ext_ack *extack) |
773 | { | |
774 | struct tc_indr_block_cb *indr_block_cb; | |
775 | struct tc_indr_block_dev *indr_dev; | |
955bcb6e | 776 | struct flow_block_offload bo = { |
7f76fa36 JH |
777 | .command = command, |
778 | .binder_type = ei->binder_type, | |
da3eeb90 | 779 | .net = dev_net(dev), |
14bfb13f | 780 | .block = &block->flow_block, |
955bcb6e | 781 | .block_shared = tcf_block_shared(block), |
7f76fa36 JH |
782 | .extack = extack, |
783 | }; | |
59094b1e | 784 | INIT_LIST_HEAD(&bo.cb_list); |
7f76fa36 JH |
785 | |
786 | indr_dev = tc_indr_block_dev_lookup(dev); | |
787 | if (!indr_dev) | |
788 | return; | |
789 | ||
9c0e189e | 790 | indr_dev->block = command == FLOW_BLOCK_BIND ? block : NULL; |
7f76fa36 JH |
791 | |
792 | list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list) | |
793 | indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK, | |
794 | &bo); | |
59094b1e PNA |
795 | |
796 | tcf_block_setup(block, &bo); | |
7f76fa36 JH |
797 | } |
798 | ||
caa72601 JP |
799 | static bool tcf_block_offload_in_use(struct tcf_block *block) |
800 | { | |
801 | return block->offloadcnt; | |
802 | } | |
803 | ||
804 | static int tcf_block_offload_cmd(struct tcf_block *block, | |
805 | struct net_device *dev, | |
806 | struct tcf_block_ext_info *ei, | |
9c0e189e | 807 | enum flow_block_command command, |
60513bd8 | 808 | struct netlink_ext_ack *extack) |
8c4083b3 | 809 | { |
955bcb6e | 810 | struct flow_block_offload bo = {}; |
59094b1e | 811 | int err; |
8c4083b3 | 812 | |
da3eeb90 | 813 | bo.net = dev_net(dev); |
8c4083b3 JP |
814 | bo.command = command; |
815 | bo.binder_type = ei->binder_type; | |
14bfb13f | 816 | bo.block = &block->flow_block; |
955bcb6e | 817 | bo.block_shared = tcf_block_shared(block); |
60513bd8 | 818 | bo.extack = extack; |
59094b1e PNA |
819 | INIT_LIST_HEAD(&bo.cb_list); |
820 | ||
821 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); | |
822 | if (err < 0) | |
823 | return err; | |
824 | ||
825 | return tcf_block_setup(block, &bo); | |
8c4083b3 JP |
826 | } |
827 | ||
caa72601 | 828 | static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, |
60513bd8 JH |
829 | struct tcf_block_ext_info *ei, |
830 | struct netlink_ext_ack *extack) | |
8c4083b3 | 831 | { |
caa72601 JP |
832 | struct net_device *dev = q->dev_queue->dev; |
833 | int err; | |
834 | ||
835 | if (!dev->netdev_ops->ndo_setup_tc) | |
836 | goto no_offload_dev_inc; | |
837 | ||
838 | /* If tc offload feature is disabled and the block we try to bind | |
839 | * to already has some offloaded filters, forbid to bind. | |
840 | */ | |
60513bd8 JH |
841 | if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) { |
842 | NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled"); | |
caa72601 | 843 | return -EOPNOTSUPP; |
60513bd8 | 844 | } |
caa72601 | 845 | |
9c0e189e | 846 | err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_BIND, extack); |
caa72601 JP |
847 | if (err == -EOPNOTSUPP) |
848 | goto no_offload_dev_inc; | |
7f76fa36 JH |
849 | if (err) |
850 | return err; | |
851 | ||
9c0e189e | 852 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); |
7f76fa36 | 853 | return 0; |
caa72601 JP |
854 | |
855 | no_offload_dev_inc: | |
856 | if (tcf_block_offload_in_use(block)) | |
857 | return -EOPNOTSUPP; | |
858 | block->nooffloaddevcnt++; | |
9c0e189e | 859 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack); |
caa72601 | 860 | return 0; |
8c4083b3 JP |
861 | } |
862 | ||
863 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
864 | struct tcf_block_ext_info *ei) | |
865 | { | |
caa72601 JP |
866 | struct net_device *dev = q->dev_queue->dev; |
867 | int err; | |
868 | ||
9c0e189e | 869 | tc_indr_block_call(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); |
7f76fa36 | 870 | |
caa72601 JP |
871 | if (!dev->netdev_ops->ndo_setup_tc) |
872 | goto no_offload_dev_dec; | |
9c0e189e | 873 | err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_UNBIND, NULL); |
caa72601 JP |
874 | if (err == -EOPNOTSUPP) |
875 | goto no_offload_dev_dec; | |
876 | return; | |
877 | ||
878 | no_offload_dev_dec: | |
879 | WARN_ON(block->nooffloaddevcnt-- == 0); | |
8c4083b3 JP |
880 | } |
881 | ||
a9b19443 | 882 | static int |
f71e0ca4 JP |
883 | tcf_chain0_head_change_cb_add(struct tcf_block *block, |
884 | struct tcf_block_ext_info *ei, | |
885 | struct netlink_ext_ack *extack) | |
a9b19443 JP |
886 | { |
887 | struct tcf_filter_chain_list_item *item; | |
165f0135 | 888 | struct tcf_chain *chain0; |
a9b19443 JP |
889 | |
890 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
891 | if (!item) { | |
892 | NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed"); | |
893 | return -ENOMEM; | |
894 | } | |
895 | item->chain_head_change = ei->chain_head_change; | |
896 | item->chain_head_change_priv = ei->chain_head_change_priv; | |
165f0135 VB |
897 | |
898 | mutex_lock(&block->lock); | |
899 | chain0 = block->chain0.chain; | |
ed76f5ed VB |
900 | if (chain0) |
901 | tcf_chain_hold(chain0); | |
902 | else | |
903 | list_add(&item->list, &block->chain0.filter_chain_list); | |
165f0135 VB |
904 | mutex_unlock(&block->lock); |
905 | ||
ed76f5ed VB |
906 | if (chain0) { |
907 | struct tcf_proto *tp_head; | |
908 | ||
909 | mutex_lock(&chain0->filter_chain_lock); | |
910 | ||
911 | tp_head = tcf_chain_dereference(chain0->filter_chain, chain0); | |
912 | if (tp_head) | |
913 | tcf_chain_head_change_item(item, tp_head); | |
914 | ||
915 | mutex_lock(&block->lock); | |
916 | list_add(&item->list, &block->chain0.filter_chain_list); | |
917 | mutex_unlock(&block->lock); | |
918 | ||
919 | mutex_unlock(&chain0->filter_chain_lock); | |
920 | tcf_chain_put(chain0); | |
921 | } | |
922 | ||
a9b19443 JP |
923 | return 0; |
924 | } | |
925 | ||
926 | static void | |
f71e0ca4 JP |
927 | tcf_chain0_head_change_cb_del(struct tcf_block *block, |
928 | struct tcf_block_ext_info *ei) | |
a9b19443 JP |
929 | { |
930 | struct tcf_filter_chain_list_item *item; | |
931 | ||
165f0135 | 932 | mutex_lock(&block->lock); |
f71e0ca4 | 933 | list_for_each_entry(item, &block->chain0.filter_chain_list, list) { |
a9b19443 JP |
934 | if ((!ei->chain_head_change && !ei->chain_head_change_priv) || |
935 | (item->chain_head_change == ei->chain_head_change && | |
936 | item->chain_head_change_priv == ei->chain_head_change_priv)) { | |
165f0135 | 937 | if (block->chain0.chain) |
f71e0ca4 | 938 | tcf_chain_head_change_item(item, NULL); |
a9b19443 | 939 | list_del(&item->list); |
165f0135 VB |
940 | mutex_unlock(&block->lock); |
941 | ||
a9b19443 JP |
942 | kfree(item); |
943 | return; | |
944 | } | |
945 | } | |
165f0135 | 946 | mutex_unlock(&block->lock); |
a9b19443 JP |
947 | WARN_ON(1); |
948 | } | |
949 | ||
48617387 | 950 | struct tcf_net { |
ab281629 | 951 | spinlock_t idr_lock; /* Protects idr */ |
48617387 JP |
952 | struct idr idr; |
953 | }; | |
954 | ||
955 | static unsigned int tcf_net_id; | |
956 | ||
957 | static int tcf_block_insert(struct tcf_block *block, struct net *net, | |
bb047ddd | 958 | struct netlink_ext_ack *extack) |
a9b19443 | 959 | { |
48617387 | 960 | struct tcf_net *tn = net_generic(net, tcf_net_id); |
ab281629 VB |
961 | int err; |
962 | ||
963 | idr_preload(GFP_KERNEL); | |
964 | spin_lock(&tn->idr_lock); | |
965 | err = idr_alloc_u32(&tn->idr, block, &block->index, block->index, | |
966 | GFP_NOWAIT); | |
967 | spin_unlock(&tn->idr_lock); | |
968 | idr_preload_end(); | |
48617387 | 969 | |
ab281629 | 970 | return err; |
a9b19443 JP |
971 | } |
972 | ||
48617387 JP |
973 | static void tcf_block_remove(struct tcf_block *block, struct net *net) |
974 | { | |
975 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
976 | ||
ab281629 | 977 | spin_lock(&tn->idr_lock); |
9c160941 | 978 | idr_remove(&tn->idr, block->index); |
ab281629 | 979 | spin_unlock(&tn->idr_lock); |
48617387 JP |
980 | } |
981 | ||
982 | static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, | |
bb047ddd | 983 | u32 block_index, |
48617387 | 984 | struct netlink_ext_ack *extack) |
6529eaba | 985 | { |
48617387 | 986 | struct tcf_block *block; |
6529eaba | 987 | |
48617387 | 988 | block = kzalloc(sizeof(*block), GFP_KERNEL); |
8d1a77f9 AA |
989 | if (!block) { |
990 | NL_SET_ERR_MSG(extack, "Memory allocation for block failed"); | |
48617387 | 991 | return ERR_PTR(-ENOMEM); |
8d1a77f9 | 992 | } |
c266f64d | 993 | mutex_init(&block->lock); |
14bfb13f | 994 | flow_block_init(&block->flow_block); |
5bc17018 | 995 | INIT_LIST_HEAD(&block->chain_list); |
f36fe1c4 | 996 | INIT_LIST_HEAD(&block->owner_list); |
f71e0ca4 | 997 | INIT_LIST_HEAD(&block->chain0.filter_chain_list); |
acb67442 | 998 | |
cfebd7e2 | 999 | refcount_set(&block->refcnt, 1); |
48617387 | 1000 | block->net = net; |
bb047ddd JP |
1001 | block->index = block_index; |
1002 | ||
1003 | /* Don't store q pointer for blocks which are shared */ | |
1004 | if (!tcf_block_shared(block)) | |
1005 | block->q = q; | |
48617387 | 1006 | return block; |
48617387 JP |
1007 | } |
1008 | ||
1009 | static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index) | |
1010 | { | |
1011 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
1012 | ||
322d884b | 1013 | return idr_find(&tn->idr, block_index); |
48617387 JP |
1014 | } |
1015 | ||
0607e439 VB |
1016 | static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index) |
1017 | { | |
1018 | struct tcf_block *block; | |
1019 | ||
1020 | rcu_read_lock(); | |
1021 | block = tcf_block_lookup(net, block_index); | |
1022 | if (block && !refcount_inc_not_zero(&block->refcnt)) | |
1023 | block = NULL; | |
1024 | rcu_read_unlock(); | |
1025 | ||
1026 | return block; | |
1027 | } | |
1028 | ||
bbf73830 VB |
1029 | static struct tcf_chain * |
1030 | __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 1031 | { |
bbf73830 VB |
1032 | mutex_lock(&block->lock); |
1033 | if (chain) | |
1034 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
1035 | NULL : list_next_entry(chain, list); | |
1036 | else | |
1037 | chain = list_first_entry_or_null(&block->chain_list, | |
1038 | struct tcf_chain, list); | |
f0023436 | 1039 | |
bbf73830 VB |
1040 | /* skip all action-only chains */ |
1041 | while (chain && tcf_chain_held_by_acts_only(chain)) | |
1042 | chain = list_is_last(&chain->list, &block->chain_list) ? | |
1043 | NULL : list_next_entry(chain, list); | |
1044 | ||
1045 | if (chain) | |
f0023436 | 1046 | tcf_chain_hold(chain); |
bbf73830 | 1047 | mutex_unlock(&block->lock); |
f0023436 | 1048 | |
bbf73830 | 1049 | return chain; |
f0023436 VB |
1050 | } |
1051 | ||
bbf73830 VB |
1052 | /* Function to be used by all clients that want to iterate over all chains on |
1053 | * block. It properly obtains block->lock and takes reference to chain before | |
1054 | * returning it. Users of this function must be tolerant to concurrent chain | |
1055 | * insertion/deletion or ensure that no concurrent chain modification is | |
1056 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
1057 | * consistent dump because rtnl lock is released each time skb is filled with | |
1058 | * data and sent to user-space. | |
1059 | */ | |
1060 | ||
1061 | struct tcf_chain * | |
1062 | tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain) | |
f0023436 | 1063 | { |
bbf73830 | 1064 | struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain); |
f0023436 | 1065 | |
bbf73830 | 1066 | if (chain) |
f0023436 | 1067 | tcf_chain_put(chain); |
bbf73830 VB |
1068 | |
1069 | return chain_next; | |
1070 | } | |
1071 | EXPORT_SYMBOL(tcf_get_next_chain); | |
1072 | ||
fe2923af VB |
1073 | static struct tcf_proto * |
1074 | __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp) | |
1075 | { | |
8b64678e VB |
1076 | u32 prio = 0; |
1077 | ||
fe2923af VB |
1078 | ASSERT_RTNL(); |
1079 | mutex_lock(&chain->filter_chain_lock); | |
1080 | ||
8b64678e | 1081 | if (!tp) { |
fe2923af | 1082 | tp = tcf_chain_dereference(chain->filter_chain, chain); |
8b64678e VB |
1083 | } else if (tcf_proto_is_deleting(tp)) { |
1084 | /* 'deleting' flag is set and chain->filter_chain_lock was | |
1085 | * unlocked, which means next pointer could be invalid. Restart | |
1086 | * search. | |
1087 | */ | |
1088 | prio = tp->prio + 1; | |
1089 | tp = tcf_chain_dereference(chain->filter_chain, chain); | |
1090 | ||
1091 | for (; tp; tp = tcf_chain_dereference(tp->next, chain)) | |
1092 | if (!tp->deleting && tp->prio >= prio) | |
1093 | break; | |
1094 | } else { | |
fe2923af | 1095 | tp = tcf_chain_dereference(tp->next, chain); |
8b64678e | 1096 | } |
fe2923af VB |
1097 | |
1098 | if (tp) | |
1099 | tcf_proto_get(tp); | |
1100 | ||
1101 | mutex_unlock(&chain->filter_chain_lock); | |
1102 | ||
1103 | return tp; | |
1104 | } | |
1105 | ||
1106 | /* Function to be used by all clients that want to iterate over all tp's on | |
1107 | * chain. Users of this function must be tolerant to concurrent tp | |
1108 | * insertion/deletion or ensure that no concurrent chain modification is | |
1109 | * possible. Note that all netlink dump callbacks cannot guarantee to provide | |
1110 | * consistent dump because rtnl lock is released each time skb is filled with | |
1111 | * data and sent to user-space. | |
1112 | */ | |
1113 | ||
1114 | struct tcf_proto * | |
12db03b6 VB |
1115 | tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp, |
1116 | bool rtnl_held) | |
fe2923af VB |
1117 | { |
1118 | struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp); | |
1119 | ||
1120 | if (tp) | |
12db03b6 | 1121 | tcf_proto_put(tp, rtnl_held, NULL); |
fe2923af VB |
1122 | |
1123 | return tp_next; | |
1124 | } | |
1125 | EXPORT_SYMBOL(tcf_get_next_proto); | |
1126 | ||
12db03b6 | 1127 | static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held) |
bbf73830 VB |
1128 | { |
1129 | struct tcf_chain *chain; | |
1130 | ||
1131 | /* Last reference to block. At this point chains cannot be added or | |
1132 | * removed concurrently. | |
1133 | */ | |
1134 | for (chain = tcf_get_next_chain(block, NULL); | |
1135 | chain; | |
1136 | chain = tcf_get_next_chain(block, chain)) { | |
1137 | tcf_chain_put_explicitly_created(chain); | |
12db03b6 | 1138 | tcf_chain_flush(chain, rtnl_held); |
f0023436 VB |
1139 | } |
1140 | } | |
1141 | ||
18d3eefb VB |
1142 | /* Lookup Qdisc and increments its reference counter. |
1143 | * Set parent, if necessary. | |
1144 | */ | |
1145 | ||
1146 | static int __tcf_qdisc_find(struct net *net, struct Qdisc **q, | |
1147 | u32 *parent, int ifindex, bool rtnl_held, | |
1148 | struct netlink_ext_ack *extack) | |
1149 | { | |
1150 | const struct Qdisc_class_ops *cops; | |
1151 | struct net_device *dev; | |
1152 | int err = 0; | |
1153 | ||
1154 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1155 | return 0; | |
1156 | ||
1157 | rcu_read_lock(); | |
1158 | ||
1159 | /* Find link */ | |
1160 | dev = dev_get_by_index_rcu(net, ifindex); | |
1161 | if (!dev) { | |
1162 | rcu_read_unlock(); | |
1163 | return -ENODEV; | |
1164 | } | |
1165 | ||
1166 | /* Find qdisc */ | |
1167 | if (!*parent) { | |
1168 | *q = dev->qdisc; | |
1169 | *parent = (*q)->handle; | |
1170 | } else { | |
1171 | *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent)); | |
1172 | if (!*q) { | |
1173 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1174 | err = -EINVAL; | |
1175 | goto errout_rcu; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | *q = qdisc_refcount_inc_nz(*q); | |
1180 | if (!*q) { | |
1181 | NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists"); | |
1182 | err = -EINVAL; | |
1183 | goto errout_rcu; | |
1184 | } | |
1185 | ||
1186 | /* Is it classful? */ | |
1187 | cops = (*q)->ops->cl_ops; | |
1188 | if (!cops) { | |
1189 | NL_SET_ERR_MSG(extack, "Qdisc not classful"); | |
1190 | err = -EINVAL; | |
1191 | goto errout_qdisc; | |
1192 | } | |
1193 | ||
1194 | if (!cops->tcf_block) { | |
1195 | NL_SET_ERR_MSG(extack, "Class doesn't support blocks"); | |
1196 | err = -EOPNOTSUPP; | |
1197 | goto errout_qdisc; | |
1198 | } | |
1199 | ||
1200 | errout_rcu: | |
1201 | /* At this point we know that qdisc is not noop_qdisc, | |
1202 | * which means that qdisc holds a reference to net_device | |
1203 | * and we hold a reference to qdisc, so it is safe to release | |
1204 | * rcu read lock. | |
1205 | */ | |
1206 | rcu_read_unlock(); | |
1207 | return err; | |
1208 | ||
1209 | errout_qdisc: | |
1210 | rcu_read_unlock(); | |
1211 | ||
1212 | if (rtnl_held) | |
1213 | qdisc_put(*q); | |
1214 | else | |
1215 | qdisc_put_unlocked(*q); | |
1216 | *q = NULL; | |
1217 | ||
1218 | return err; | |
1219 | } | |
1220 | ||
1221 | static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl, | |
1222 | int ifindex, struct netlink_ext_ack *extack) | |
1223 | { | |
1224 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) | |
1225 | return 0; | |
1226 | ||
1227 | /* Do we search for filter, attached to class? */ | |
1228 | if (TC_H_MIN(parent)) { | |
1229 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1230 | ||
1231 | *cl = cops->find(q, parent); | |
1232 | if (*cl == 0) { | |
1233 | NL_SET_ERR_MSG(extack, "Specified class doesn't exist"); | |
1234 | return -ENOENT; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q, | |
1242 | unsigned long cl, int ifindex, | |
1243 | u32 block_index, | |
1244 | struct netlink_ext_ack *extack) | |
1245 | { | |
1246 | struct tcf_block *block; | |
1247 | ||
1248 | if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
1249 | block = tcf_block_refcnt_get(net, block_index); | |
1250 | if (!block) { | |
1251 | NL_SET_ERR_MSG(extack, "Block of given index was not found"); | |
1252 | return ERR_PTR(-EINVAL); | |
1253 | } | |
1254 | } else { | |
1255 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1256 | ||
1257 | block = cops->tcf_block(q, cl, extack); | |
1258 | if (!block) | |
1259 | return ERR_PTR(-EINVAL); | |
1260 | ||
1261 | if (tcf_block_shared(block)) { | |
1262 | NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters"); | |
1263 | return ERR_PTR(-EOPNOTSUPP); | |
1264 | } | |
1265 | ||
1266 | /* Always take reference to block in order to support execution | |
1267 | * of rules update path of cls API without rtnl lock. Caller | |
1268 | * must release block when it is finished using it. 'if' block | |
1269 | * of this conditional obtain reference to block by calling | |
1270 | * tcf_block_refcnt_get(). | |
1271 | */ | |
1272 | refcount_inc(&block->refcnt); | |
1273 | } | |
1274 | ||
1275 | return block; | |
1276 | } | |
1277 | ||
0607e439 | 1278 | static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q, |
12db03b6 | 1279 | struct tcf_block_ext_info *ei, bool rtnl_held) |
0607e439 | 1280 | { |
c266f64d | 1281 | if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) { |
0607e439 VB |
1282 | /* Flushing/putting all chains will cause the block to be |
1283 | * deallocated when last chain is freed. However, if chain_list | |
1284 | * is empty, block has to be manually deallocated. After block | |
1285 | * reference counter reached 0, it is no longer possible to | |
1286 | * increment it or add new chains to block. | |
1287 | */ | |
1288 | bool free_block = list_empty(&block->chain_list); | |
1289 | ||
c266f64d | 1290 | mutex_unlock(&block->lock); |
0607e439 VB |
1291 | if (tcf_block_shared(block)) |
1292 | tcf_block_remove(block, block->net); | |
0607e439 VB |
1293 | |
1294 | if (q) | |
1295 | tcf_block_offload_unbind(block, q, ei); | |
1296 | ||
1297 | if (free_block) | |
c266f64d | 1298 | tcf_block_destroy(block); |
0607e439 | 1299 | else |
12db03b6 | 1300 | tcf_block_flush_all_chains(block, rtnl_held); |
0607e439 VB |
1301 | } else if (q) { |
1302 | tcf_block_offload_unbind(block, q, ei); | |
1303 | } | |
1304 | } | |
1305 | ||
12db03b6 | 1306 | static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held) |
0607e439 | 1307 | { |
12db03b6 | 1308 | __tcf_block_put(block, NULL, NULL, rtnl_held); |
0607e439 VB |
1309 | } |
1310 | ||
c431f89b VB |
1311 | /* Find tcf block. |
1312 | * Set q, parent, cl when appropriate. | |
1313 | */ | |
1314 | ||
1315 | static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q, | |
1316 | u32 *parent, unsigned long *cl, | |
1317 | int ifindex, u32 block_index, | |
1318 | struct netlink_ext_ack *extack) | |
1319 | { | |
1320 | struct tcf_block *block; | |
e368fdb6 | 1321 | int err = 0; |
c431f89b | 1322 | |
18d3eefb | 1323 | ASSERT_RTNL(); |
e368fdb6 | 1324 | |
18d3eefb VB |
1325 | err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack); |
1326 | if (err) | |
1327 | goto errout; | |
c431f89b | 1328 | |
18d3eefb VB |
1329 | err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack); |
1330 | if (err) | |
1331 | goto errout_qdisc; | |
787ce6d0 | 1332 | |
18d3eefb | 1333 | block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack); |
af736bf0 DC |
1334 | if (IS_ERR(block)) { |
1335 | err = PTR_ERR(block); | |
18d3eefb | 1336 | goto errout_qdisc; |
af736bf0 | 1337 | } |
c431f89b VB |
1338 | |
1339 | return block; | |
e368fdb6 | 1340 | |
e368fdb6 | 1341 | errout_qdisc: |
18d3eefb | 1342 | if (*q) |
e368fdb6 | 1343 | qdisc_put(*q); |
18d3eefb VB |
1344 | errout: |
1345 | *q = NULL; | |
e368fdb6 VB |
1346 | return ERR_PTR(err); |
1347 | } | |
1348 | ||
12db03b6 VB |
1349 | static void tcf_block_release(struct Qdisc *q, struct tcf_block *block, |
1350 | bool rtnl_held) | |
e368fdb6 | 1351 | { |
787ce6d0 | 1352 | if (!IS_ERR_OR_NULL(block)) |
12db03b6 | 1353 | tcf_block_refcnt_put(block, rtnl_held); |
787ce6d0 | 1354 | |
470502de VB |
1355 | if (q) { |
1356 | if (rtnl_held) | |
1357 | qdisc_put(q); | |
1358 | else | |
1359 | qdisc_put_unlocked(q); | |
1360 | } | |
c431f89b VB |
1361 | } |
1362 | ||
f36fe1c4 JP |
1363 | struct tcf_block_owner_item { |
1364 | struct list_head list; | |
1365 | struct Qdisc *q; | |
32f8c409 | 1366 | enum flow_block_binder_type binder_type; |
f36fe1c4 JP |
1367 | }; |
1368 | ||
1369 | static void | |
1370 | tcf_block_owner_netif_keep_dst(struct tcf_block *block, | |
1371 | struct Qdisc *q, | |
32f8c409 | 1372 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1373 | { |
1374 | if (block->keep_dst && | |
32f8c409 PNA |
1375 | binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS && |
1376 | binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS) | |
f36fe1c4 JP |
1377 | netif_keep_dst(qdisc_dev(q)); |
1378 | } | |
1379 | ||
1380 | void tcf_block_netif_keep_dst(struct tcf_block *block) | |
1381 | { | |
1382 | struct tcf_block_owner_item *item; | |
1383 | ||
1384 | block->keep_dst = true; | |
1385 | list_for_each_entry(item, &block->owner_list, list) | |
1386 | tcf_block_owner_netif_keep_dst(block, item->q, | |
1387 | item->binder_type); | |
1388 | } | |
1389 | EXPORT_SYMBOL(tcf_block_netif_keep_dst); | |
1390 | ||
1391 | static int tcf_block_owner_add(struct tcf_block *block, | |
1392 | struct Qdisc *q, | |
32f8c409 | 1393 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1394 | { |
1395 | struct tcf_block_owner_item *item; | |
1396 | ||
1397 | item = kmalloc(sizeof(*item), GFP_KERNEL); | |
1398 | if (!item) | |
1399 | return -ENOMEM; | |
1400 | item->q = q; | |
1401 | item->binder_type = binder_type; | |
1402 | list_add(&item->list, &block->owner_list); | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | static void tcf_block_owner_del(struct tcf_block *block, | |
1407 | struct Qdisc *q, | |
32f8c409 | 1408 | enum flow_block_binder_type binder_type) |
f36fe1c4 JP |
1409 | { |
1410 | struct tcf_block_owner_item *item; | |
1411 | ||
1412 | list_for_each_entry(item, &block->owner_list, list) { | |
1413 | if (item->q == q && item->binder_type == binder_type) { | |
1414 | list_del(&item->list); | |
1415 | kfree(item); | |
1416 | return; | |
1417 | } | |
1418 | } | |
1419 | WARN_ON(1); | |
1420 | } | |
1421 | ||
48617387 JP |
1422 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
1423 | struct tcf_block_ext_info *ei, | |
1424 | struct netlink_ext_ack *extack) | |
1425 | { | |
1426 | struct net *net = qdisc_net(q); | |
1427 | struct tcf_block *block = NULL; | |
48617387 JP |
1428 | int err; |
1429 | ||
787ce6d0 | 1430 | if (ei->block_index) |
48617387 | 1431 | /* block_index not 0 means the shared block is requested */ |
787ce6d0 | 1432 | block = tcf_block_refcnt_get(net, ei->block_index); |
48617387 JP |
1433 | |
1434 | if (!block) { | |
bb047ddd | 1435 | block = tcf_block_create(net, q, ei->block_index, extack); |
48617387 JP |
1436 | if (IS_ERR(block)) |
1437 | return PTR_ERR(block); | |
bb047ddd JP |
1438 | if (tcf_block_shared(block)) { |
1439 | err = tcf_block_insert(block, net, extack); | |
48617387 JP |
1440 | if (err) |
1441 | goto err_block_insert; | |
1442 | } | |
1443 | } | |
1444 | ||
f36fe1c4 JP |
1445 | err = tcf_block_owner_add(block, q, ei->binder_type); |
1446 | if (err) | |
1447 | goto err_block_owner_add; | |
1448 | ||
1449 | tcf_block_owner_netif_keep_dst(block, q, ei->binder_type); | |
1450 | ||
f71e0ca4 | 1451 | err = tcf_chain0_head_change_cb_add(block, ei, extack); |
a9b19443 | 1452 | if (err) |
f71e0ca4 | 1453 | goto err_chain0_head_change_cb_add; |
caa72601 | 1454 | |
60513bd8 | 1455 | err = tcf_block_offload_bind(block, q, ei, extack); |
caa72601 JP |
1456 | if (err) |
1457 | goto err_block_offload_bind; | |
1458 | ||
6529eaba JP |
1459 | *p_block = block; |
1460 | return 0; | |
2190d1d0 | 1461 | |
caa72601 | 1462 | err_block_offload_bind: |
f71e0ca4 JP |
1463 | tcf_chain0_head_change_cb_del(block, ei); |
1464 | err_chain0_head_change_cb_add: | |
f36fe1c4 JP |
1465 | tcf_block_owner_del(block, q, ei->binder_type); |
1466 | err_block_owner_add: | |
48617387 | 1467 | err_block_insert: |
12db03b6 | 1468 | tcf_block_refcnt_put(block, true); |
2190d1d0 | 1469 | return err; |
6529eaba | 1470 | } |
8c4083b3 JP |
1471 | EXPORT_SYMBOL(tcf_block_get_ext); |
1472 | ||
c7eb7d72 JP |
1473 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
1474 | { | |
1475 | struct tcf_proto __rcu **p_filter_chain = priv; | |
1476 | ||
1477 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
1478 | } | |
1479 | ||
8c4083b3 | 1480 | int tcf_block_get(struct tcf_block **p_block, |
8d1a77f9 AA |
1481 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q, |
1482 | struct netlink_ext_ack *extack) | |
8c4083b3 | 1483 | { |
c7eb7d72 JP |
1484 | struct tcf_block_ext_info ei = { |
1485 | .chain_head_change = tcf_chain_head_change_dflt, | |
1486 | .chain_head_change_priv = p_filter_chain, | |
1487 | }; | |
8c4083b3 | 1488 | |
c7eb7d72 | 1489 | WARN_ON(!p_filter_chain); |
8d1a77f9 | 1490 | return tcf_block_get_ext(p_block, q, &ei, extack); |
8c4083b3 | 1491 | } |
6529eaba JP |
1492 | EXPORT_SYMBOL(tcf_block_get); |
1493 | ||
7aa0045d | 1494 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 1495 | * actions should be all removed after flushing. |
7aa0045d | 1496 | */ |
c7eb7d72 | 1497 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 1498 | struct tcf_block_ext_info *ei) |
7aa0045d | 1499 | { |
c30abd5e DM |
1500 | if (!block) |
1501 | return; | |
f71e0ca4 | 1502 | tcf_chain0_head_change_cb_del(block, ei); |
f36fe1c4 | 1503 | tcf_block_owner_del(block, q, ei->binder_type); |
a60b3f51 | 1504 | |
12db03b6 | 1505 | __tcf_block_put(block, q, ei, true); |
6529eaba | 1506 | } |
8c4083b3 JP |
1507 | EXPORT_SYMBOL(tcf_block_put_ext); |
1508 | ||
1509 | void tcf_block_put(struct tcf_block *block) | |
1510 | { | |
1511 | struct tcf_block_ext_info ei = {0, }; | |
1512 | ||
4853f128 JP |
1513 | if (!block) |
1514 | return; | |
c7eb7d72 | 1515 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 1516 | } |
e1ea2f98 | 1517 | |
6529eaba | 1518 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 1519 | |
32636742 | 1520 | static int |
a7323311 | 1521 | tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb, |
32636742 JH |
1522 | void *cb_priv, bool add, bool offload_in_use, |
1523 | struct netlink_ext_ack *extack) | |
1524 | { | |
bbf73830 | 1525 | struct tcf_chain *chain, *chain_prev; |
fe2923af | 1526 | struct tcf_proto *tp, *tp_prev; |
32636742 JH |
1527 | int err; |
1528 | ||
bbf73830 VB |
1529 | for (chain = __tcf_get_next_chain(block, NULL); |
1530 | chain; | |
1531 | chain_prev = chain, | |
1532 | chain = __tcf_get_next_chain(block, chain), | |
1533 | tcf_chain_put(chain_prev)) { | |
fe2923af VB |
1534 | for (tp = __tcf_get_next_proto(chain, NULL); tp; |
1535 | tp_prev = tp, | |
1536 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 1537 | tcf_proto_put(tp_prev, true, NULL)) { |
32636742 JH |
1538 | if (tp->ops->reoffload) { |
1539 | err = tp->ops->reoffload(tp, add, cb, cb_priv, | |
1540 | extack); | |
1541 | if (err && add) | |
1542 | goto err_playback_remove; | |
1543 | } else if (add && offload_in_use) { | |
1544 | err = -EOPNOTSUPP; | |
1545 | NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support"); | |
1546 | goto err_playback_remove; | |
1547 | } | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | return 0; | |
1552 | ||
1553 | err_playback_remove: | |
12db03b6 | 1554 | tcf_proto_put(tp, true, NULL); |
bbf73830 | 1555 | tcf_chain_put(chain); |
32636742 JH |
1556 | tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use, |
1557 | extack); | |
1558 | return err; | |
1559 | } | |
1560 | ||
59094b1e PNA |
1561 | static int tcf_block_bind(struct tcf_block *block, |
1562 | struct flow_block_offload *bo) | |
1563 | { | |
1564 | struct flow_block_cb *block_cb, *next; | |
1565 | int err, i = 0; | |
1566 | ||
1567 | list_for_each_entry(block_cb, &bo->cb_list, list) { | |
1568 | err = tcf_block_playback_offloads(block, block_cb->cb, | |
1569 | block_cb->cb_priv, true, | |
1570 | tcf_block_offload_in_use(block), | |
1571 | bo->extack); | |
1572 | if (err) | |
1573 | goto err_unroll; | |
1574 | ||
1575 | i++; | |
1576 | } | |
14bfb13f | 1577 | list_splice(&bo->cb_list, &block->flow_block.cb_list); |
59094b1e PNA |
1578 | |
1579 | return 0; | |
1580 | ||
1581 | err_unroll: | |
1582 | list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { | |
1583 | if (i-- > 0) { | |
1584 | list_del(&block_cb->list); | |
1585 | tcf_block_playback_offloads(block, block_cb->cb, | |
1586 | block_cb->cb_priv, false, | |
1587 | tcf_block_offload_in_use(block), | |
1588 | NULL); | |
1589 | } | |
1590 | flow_block_cb_free(block_cb); | |
1591 | } | |
1592 | ||
1593 | return err; | |
1594 | } | |
1595 | ||
1596 | static void tcf_block_unbind(struct tcf_block *block, | |
1597 | struct flow_block_offload *bo) | |
1598 | { | |
1599 | struct flow_block_cb *block_cb, *next; | |
1600 | ||
1601 | list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) { | |
1602 | tcf_block_playback_offloads(block, block_cb->cb, | |
1603 | block_cb->cb_priv, false, | |
1604 | tcf_block_offload_in_use(block), | |
1605 | NULL); | |
1606 | list_del(&block_cb->list); | |
1607 | flow_block_cb_free(block_cb); | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | static int tcf_block_setup(struct tcf_block *block, | |
1612 | struct flow_block_offload *bo) | |
1613 | { | |
1614 | int err; | |
1615 | ||
1616 | switch (bo->command) { | |
1617 | case FLOW_BLOCK_BIND: | |
1618 | err = tcf_block_bind(block, bo); | |
1619 | break; | |
1620 | case FLOW_BLOCK_UNBIND: | |
1621 | err = 0; | |
1622 | tcf_block_unbind(block, bo); | |
1623 | break; | |
1624 | default: | |
1625 | WARN_ON_ONCE(1); | |
1626 | err = -EOPNOTSUPP; | |
1627 | } | |
1628 | ||
1629 | return err; | |
1630 | } | |
1631 | ||
87d83093 JP |
1632 | /* Main classifier routine: scans classifier chain attached |
1633 | * to this qdisc, (optionally) tests for protocol and asks | |
1634 | * specific classifiers. | |
1635 | */ | |
1636 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
1637 | struct tcf_result *res, bool compat_mode) | |
1638 | { | |
87d83093 JP |
1639 | #ifdef CONFIG_NET_CLS_ACT |
1640 | const int max_reclassify_loop = 4; | |
ee538dce JP |
1641 | const struct tcf_proto *orig_tp = tp; |
1642 | const struct tcf_proto *first_tp; | |
87d83093 JP |
1643 | int limit = 0; |
1644 | ||
1645 | reclassify: | |
1646 | #endif | |
1647 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
cd0c4e70 | 1648 | __be16 protocol = tc_skb_protocol(skb); |
87d83093 JP |
1649 | int err; |
1650 | ||
1651 | if (tp->protocol != protocol && | |
1652 | tp->protocol != htons(ETH_P_ALL)) | |
1653 | continue; | |
1654 | ||
1655 | err = tp->classify(skb, tp, res); | |
1656 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 1657 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 1658 | first_tp = orig_tp; |
87d83093 | 1659 | goto reset; |
db50514f | 1660 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 1661 | first_tp = res->goto_tp; |
db50514f JP |
1662 | goto reset; |
1663 | } | |
87d83093 JP |
1664 | #endif |
1665 | if (err >= 0) | |
1666 | return err; | |
1667 | } | |
1668 | ||
1669 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
1670 | #ifdef CONFIG_NET_CLS_ACT | |
1671 | reset: | |
1672 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
9d3aaff3 JP |
1673 | net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n", |
1674 | tp->chain->block->index, | |
1675 | tp->prio & 0xffff, | |
87d83093 JP |
1676 | ntohs(tp->protocol)); |
1677 | return TC_ACT_SHOT; | |
1678 | } | |
1679 | ||
ee538dce | 1680 | tp = first_tp; |
87d83093 JP |
1681 | goto reclassify; |
1682 | #endif | |
1683 | } | |
1684 | EXPORT_SYMBOL(tcf_classify); | |
1685 | ||
2190d1d0 JP |
1686 | struct tcf_chain_info { |
1687 | struct tcf_proto __rcu **pprev; | |
1688 | struct tcf_proto __rcu *next; | |
1689 | }; | |
1690 | ||
ed76f5ed VB |
1691 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain, |
1692 | struct tcf_chain_info *chain_info) | |
2190d1d0 | 1693 | { |
ed76f5ed | 1694 | return tcf_chain_dereference(*chain_info->pprev, chain); |
2190d1d0 JP |
1695 | } |
1696 | ||
726d0612 VB |
1697 | static int tcf_chain_tp_insert(struct tcf_chain *chain, |
1698 | struct tcf_chain_info *chain_info, | |
1699 | struct tcf_proto *tp) | |
2190d1d0 | 1700 | { |
726d0612 VB |
1701 | if (chain->flushing) |
1702 | return -EAGAIN; | |
1703 | ||
c7eb7d72 | 1704 | if (*chain_info->pprev == chain->filter_chain) |
f71e0ca4 | 1705 | tcf_chain0_head_change(chain, tp); |
4dbfa766 | 1706 | tcf_proto_get(tp); |
ed76f5ed | 1707 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info)); |
2190d1d0 | 1708 | rcu_assign_pointer(*chain_info->pprev, tp); |
726d0612 VB |
1709 | |
1710 | return 0; | |
2190d1d0 JP |
1711 | } |
1712 | ||
1713 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
1714 | struct tcf_chain_info *chain_info, | |
1715 | struct tcf_proto *tp) | |
1716 | { | |
ed76f5ed | 1717 | struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain); |
2190d1d0 | 1718 | |
8b64678e | 1719 | tcf_proto_mark_delete(tp); |
c7eb7d72 | 1720 | if (tp == chain->filter_chain) |
f71e0ca4 | 1721 | tcf_chain0_head_change(chain, next); |
2190d1d0 JP |
1722 | RCU_INIT_POINTER(*chain_info->pprev, next); |
1723 | } | |
1724 | ||
8b64678e VB |
1725 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1726 | struct tcf_chain_info *chain_info, | |
1727 | u32 protocol, u32 prio, | |
1728 | bool prio_allocate); | |
1729 | ||
1730 | /* Try to insert new proto. | |
1731 | * If proto with specified priority already exists, free new proto | |
1732 | * and return existing one. | |
1733 | */ | |
1734 | ||
1735 | static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain, | |
1736 | struct tcf_proto *tp_new, | |
12db03b6 VB |
1737 | u32 protocol, u32 prio, |
1738 | bool rtnl_held) | |
8b64678e VB |
1739 | { |
1740 | struct tcf_chain_info chain_info; | |
1741 | struct tcf_proto *tp; | |
726d0612 | 1742 | int err = 0; |
8b64678e VB |
1743 | |
1744 | mutex_lock(&chain->filter_chain_lock); | |
1745 | ||
1746 | tp = tcf_chain_tp_find(chain, &chain_info, | |
1747 | protocol, prio, false); | |
1748 | if (!tp) | |
726d0612 | 1749 | err = tcf_chain_tp_insert(chain, &chain_info, tp_new); |
8b64678e VB |
1750 | mutex_unlock(&chain->filter_chain_lock); |
1751 | ||
1752 | if (tp) { | |
12db03b6 | 1753 | tcf_proto_destroy(tp_new, rtnl_held, NULL); |
8b64678e | 1754 | tp_new = tp; |
726d0612 | 1755 | } else if (err) { |
12db03b6 | 1756 | tcf_proto_destroy(tp_new, rtnl_held, NULL); |
726d0612 | 1757 | tp_new = ERR_PTR(err); |
8b64678e VB |
1758 | } |
1759 | ||
1760 | return tp_new; | |
1761 | } | |
1762 | ||
1763 | static void tcf_chain_tp_delete_empty(struct tcf_chain *chain, | |
12db03b6 | 1764 | struct tcf_proto *tp, bool rtnl_held, |
8b64678e VB |
1765 | struct netlink_ext_ack *extack) |
1766 | { | |
1767 | struct tcf_chain_info chain_info; | |
1768 | struct tcf_proto *tp_iter; | |
1769 | struct tcf_proto **pprev; | |
1770 | struct tcf_proto *next; | |
1771 | ||
1772 | mutex_lock(&chain->filter_chain_lock); | |
1773 | ||
1774 | /* Atomically find and remove tp from chain. */ | |
1775 | for (pprev = &chain->filter_chain; | |
1776 | (tp_iter = tcf_chain_dereference(*pprev, chain)); | |
1777 | pprev = &tp_iter->next) { | |
1778 | if (tp_iter == tp) { | |
1779 | chain_info.pprev = pprev; | |
1780 | chain_info.next = tp_iter->next; | |
1781 | WARN_ON(tp_iter->deleting); | |
1782 | break; | |
1783 | } | |
1784 | } | |
1785 | /* Verify that tp still exists and no new filters were inserted | |
1786 | * concurrently. | |
1787 | * Mark tp for deletion if it is empty. | |
1788 | */ | |
12db03b6 | 1789 | if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) { |
8b64678e VB |
1790 | mutex_unlock(&chain->filter_chain_lock); |
1791 | return; | |
1792 | } | |
1793 | ||
1794 | next = tcf_chain_dereference(chain_info.next, chain); | |
1795 | if (tp == chain->filter_chain) | |
1796 | tcf_chain0_head_change(chain, next); | |
1797 | RCU_INIT_POINTER(*chain_info.pprev, next); | |
1798 | mutex_unlock(&chain->filter_chain_lock); | |
1799 | ||
12db03b6 | 1800 | tcf_proto_put(tp, rtnl_held, extack); |
8b64678e VB |
1801 | } |
1802 | ||
2190d1d0 JP |
1803 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, |
1804 | struct tcf_chain_info *chain_info, | |
1805 | u32 protocol, u32 prio, | |
1806 | bool prio_allocate) | |
1807 | { | |
1808 | struct tcf_proto **pprev; | |
1809 | struct tcf_proto *tp; | |
1810 | ||
1811 | /* Check the chain for existence of proto-tcf with this priority */ | |
1812 | for (pprev = &chain->filter_chain; | |
ed76f5ed VB |
1813 | (tp = tcf_chain_dereference(*pprev, chain)); |
1814 | pprev = &tp->next) { | |
2190d1d0 JP |
1815 | if (tp->prio >= prio) { |
1816 | if (tp->prio == prio) { | |
1817 | if (prio_allocate || | |
1818 | (tp->protocol != protocol && protocol)) | |
1819 | return ERR_PTR(-EINVAL); | |
1820 | } else { | |
1821 | tp = NULL; | |
1822 | } | |
1823 | break; | |
1824 | } | |
1825 | } | |
1826 | chain_info->pprev = pprev; | |
4dbfa766 VB |
1827 | if (tp) { |
1828 | chain_info->next = tp->next; | |
1829 | tcf_proto_get(tp); | |
1830 | } else { | |
1831 | chain_info->next = NULL; | |
1832 | } | |
2190d1d0 JP |
1833 | return tp; |
1834 | } | |
1835 | ||
7120371c | 1836 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
7960d1da JP |
1837 | struct tcf_proto *tp, struct tcf_block *block, |
1838 | struct Qdisc *q, u32 parent, void *fh, | |
12db03b6 VB |
1839 | u32 portid, u32 seq, u16 flags, int event, |
1840 | bool rtnl_held) | |
7120371c WC |
1841 | { |
1842 | struct tcmsg *tcm; | |
1843 | struct nlmsghdr *nlh; | |
1844 | unsigned char *b = skb_tail_pointer(skb); | |
1845 | ||
1846 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1847 | if (!nlh) | |
1848 | goto out_nlmsg_trim; | |
1849 | tcm = nlmsg_data(nlh); | |
1850 | tcm->tcm_family = AF_UNSPEC; | |
1851 | tcm->tcm__pad1 = 0; | |
1852 | tcm->tcm__pad2 = 0; | |
7960d1da JP |
1853 | if (q) { |
1854 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1855 | tcm->tcm_parent = parent; | |
1856 | } else { | |
1857 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
1858 | tcm->tcm_block_index = block->index; | |
1859 | } | |
7120371c WC |
1860 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
1861 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
1862 | goto nla_put_failure; | |
1863 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
1864 | goto nla_put_failure; | |
1865 | if (!fh) { | |
1866 | tcm->tcm_handle = 0; | |
1867 | } else { | |
12db03b6 VB |
1868 | if (tp->ops->dump && |
1869 | tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0) | |
7120371c WC |
1870 | goto nla_put_failure; |
1871 | } | |
1872 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1873 | return skb->len; | |
1874 | ||
1875 | out_nlmsg_trim: | |
1876 | nla_put_failure: | |
1877 | nlmsg_trim(skb, b); | |
1878 | return -1; | |
1879 | } | |
1880 | ||
1881 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
1882 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1883 | struct tcf_block *block, struct Qdisc *q, |
12db03b6 VB |
1884 | u32 parent, void *fh, int event, bool unicast, |
1885 | bool rtnl_held) | |
7120371c WC |
1886 | { |
1887 | struct sk_buff *skb; | |
1888 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1889 | int err = 0; |
7120371c WC |
1890 | |
1891 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1892 | if (!skb) | |
1893 | return -ENOBUFS; | |
1894 | ||
7960d1da | 1895 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1896 | n->nlmsg_seq, n->nlmsg_flags, event, |
1897 | rtnl_held) <= 0) { | |
7120371c WC |
1898 | kfree_skb(skb); |
1899 | return -EINVAL; | |
1900 | } | |
1901 | ||
1902 | if (unicast) | |
5b5f99b1 ZW |
1903 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1904 | else | |
1905 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1906 | n->nlmsg_flags & NLM_F_ECHO); | |
7120371c | 1907 | |
5b5f99b1 ZW |
1908 | if (err > 0) |
1909 | err = 0; | |
1910 | return err; | |
7120371c WC |
1911 | } |
1912 | ||
1913 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
1914 | struct nlmsghdr *n, struct tcf_proto *tp, | |
7960d1da | 1915 | struct tcf_block *block, struct Qdisc *q, |
c35a4acc | 1916 | u32 parent, void *fh, bool unicast, bool *last, |
12db03b6 | 1917 | bool rtnl_held, struct netlink_ext_ack *extack) |
7120371c WC |
1918 | { |
1919 | struct sk_buff *skb; | |
1920 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1921 | int err; | |
1922 | ||
1923 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1924 | if (!skb) | |
1925 | return -ENOBUFS; | |
1926 | ||
7960d1da | 1927 | if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid, |
12db03b6 VB |
1928 | n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER, |
1929 | rtnl_held) <= 0) { | |
c35a4acc | 1930 | NL_SET_ERR_MSG(extack, "Failed to build del event notification"); |
7120371c WC |
1931 | kfree_skb(skb); |
1932 | return -EINVAL; | |
1933 | } | |
1934 | ||
12db03b6 | 1935 | err = tp->ops->delete(tp, fh, last, rtnl_held, extack); |
7120371c WC |
1936 | if (err) { |
1937 | kfree_skb(skb); | |
1938 | return err; | |
1939 | } | |
1940 | ||
1941 | if (unicast) | |
5b5f99b1 ZW |
1942 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
1943 | else | |
1944 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1945 | n->nlmsg_flags & NLM_F_ECHO); | |
c35a4acc AA |
1946 | if (err < 0) |
1947 | NL_SET_ERR_MSG(extack, "Failed to send filter delete notification"); | |
5b5f99b1 ZW |
1948 | |
1949 | if (err > 0) | |
1950 | err = 0; | |
c35a4acc | 1951 | return err; |
7120371c WC |
1952 | } |
1953 | ||
1954 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
7960d1da JP |
1955 | struct tcf_block *block, struct Qdisc *q, |
1956 | u32 parent, struct nlmsghdr *n, | |
12db03b6 VB |
1957 | struct tcf_chain *chain, int event, |
1958 | bool rtnl_held) | |
7120371c WC |
1959 | { |
1960 | struct tcf_proto *tp; | |
1961 | ||
12db03b6 VB |
1962 | for (tp = tcf_get_next_proto(chain, NULL, rtnl_held); |
1963 | tp; tp = tcf_get_next_proto(chain, tp, rtnl_held)) | |
7960d1da | 1964 | tfilter_notify(net, oskb, n, tp, block, |
12db03b6 | 1965 | q, parent, NULL, event, false, rtnl_held); |
7120371c WC |
1966 | } |
1967 | ||
7d5509fa VB |
1968 | static void tfilter_put(struct tcf_proto *tp, void *fh) |
1969 | { | |
1970 | if (tp->ops->put && fh) | |
1971 | tp->ops->put(tp, fh); | |
1972 | } | |
1973 | ||
c431f89b | 1974 | static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
c21ef3e3 | 1975 | struct netlink_ext_ack *extack) |
1da177e4 | 1976 | { |
3b1e0a65 | 1977 | struct net *net = sock_net(skb->sk); |
add93b61 | 1978 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1979 | struct tcmsg *t; |
1980 | u32 protocol; | |
1981 | u32 prio; | |
9d36d9e5 | 1982 | bool prio_allocate; |
1da177e4 | 1983 | u32 parent; |
5bc17018 | 1984 | u32 chain_index; |
7960d1da | 1985 | struct Qdisc *q = NULL; |
2190d1d0 | 1986 | struct tcf_chain_info chain_info; |
5bc17018 | 1987 | struct tcf_chain *chain = NULL; |
6529eaba | 1988 | struct tcf_block *block; |
1da177e4 | 1989 | struct tcf_proto *tp; |
1da177e4 | 1990 | unsigned long cl; |
8113c095 | 1991 | void *fh; |
1da177e4 | 1992 | int err; |
628185cf | 1993 | int tp_created; |
470502de | 1994 | bool rtnl_held = false; |
1da177e4 | 1995 | |
c431f89b | 1996 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 1997 | return -EPERM; |
de179c8c | 1998 | |
1da177e4 | 1999 | replay: |
628185cf DB |
2000 | tp_created = 0; |
2001 | ||
8cb08174 JB |
2002 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2003 | rtm_tca_policy, extack); | |
de179c8c H |
2004 | if (err < 0) |
2005 | return err; | |
2006 | ||
942b8165 | 2007 | t = nlmsg_data(n); |
1da177e4 LT |
2008 | protocol = TC_H_MIN(t->tcm_info); |
2009 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 2010 | prio_allocate = false; |
1da177e4 | 2011 | parent = t->tcm_parent; |
4dbfa766 | 2012 | tp = NULL; |
1da177e4 | 2013 | cl = 0; |
470502de | 2014 | block = NULL; |
1da177e4 LT |
2015 | |
2016 | if (prio == 0) { | |
c431f89b VB |
2017 | /* If no priority is provided by the user, |
2018 | * we allocate one. | |
2019 | */ | |
2020 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
2021 | prio = TC_H_MAKE(0x80000000U, 0U); | |
2022 | prio_allocate = true; | |
2023 | } else { | |
c35a4acc | 2024 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); |
1da177e4 | 2025 | return -ENOENT; |
ea7f8277 | 2026 | } |
1da177e4 LT |
2027 | } |
2028 | ||
2029 | /* Find head of filter chain. */ | |
2030 | ||
470502de VB |
2031 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2032 | if (err) | |
2033 | return err; | |
2034 | ||
2035 | /* Take rtnl mutex if rtnl_held was set to true on previous iteration, | |
2036 | * block is shared (no qdisc found), qdisc is not unlocked, classifier | |
2037 | * type is not specified, classifier is not unlocked. | |
2038 | */ | |
2039 | if (rtnl_held || | |
2040 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2041 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2042 | rtnl_held = true; | |
2043 | rtnl_lock(); | |
2044 | } | |
2045 | ||
2046 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2047 | if (err) | |
2048 | goto errout; | |
2049 | ||
2050 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2051 | extack); | |
c431f89b VB |
2052 | if (IS_ERR(block)) { |
2053 | err = PTR_ERR(block); | |
2054 | goto errout; | |
6bb16e7a | 2055 | } |
5bc17018 JP |
2056 | |
2057 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2058 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
c35a4acc | 2059 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); |
5bc17018 JP |
2060 | err = -EINVAL; |
2061 | goto errout; | |
2062 | } | |
c431f89b | 2063 | chain = tcf_chain_get(block, chain_index, true); |
5bc17018 | 2064 | if (!chain) { |
d5ed72a5 | 2065 | NL_SET_ERR_MSG(extack, "Cannot create specified filter chain"); |
c431f89b | 2066 | err = -ENOMEM; |
ea7f8277 DB |
2067 | goto errout; |
2068 | } | |
1da177e4 | 2069 | |
ed76f5ed | 2070 | mutex_lock(&chain->filter_chain_lock); |
2190d1d0 JP |
2071 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2072 | prio, prio_allocate); | |
2073 | if (IS_ERR(tp)) { | |
c35a4acc | 2074 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); |
2190d1d0 | 2075 | err = PTR_ERR(tp); |
ed76f5ed | 2076 | goto errout_locked; |
1da177e4 LT |
2077 | } |
2078 | ||
2079 | if (tp == NULL) { | |
8b64678e VB |
2080 | struct tcf_proto *tp_new = NULL; |
2081 | ||
726d0612 VB |
2082 | if (chain->flushing) { |
2083 | err = -EAGAIN; | |
2084 | goto errout_locked; | |
2085 | } | |
2086 | ||
1da177e4 LT |
2087 | /* Proto-tcf does not exist, create new one */ |
2088 | ||
6bb16e7a | 2089 | if (tca[TCA_KIND] == NULL || !protocol) { |
c35a4acc | 2090 | NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified"); |
6bb16e7a | 2091 | err = -EINVAL; |
ed76f5ed | 2092 | goto errout_locked; |
6bb16e7a | 2093 | } |
1da177e4 | 2094 | |
c431f89b | 2095 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2096 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2097 | err = -ENOENT; |
ed76f5ed | 2098 | goto errout_locked; |
6bb16e7a | 2099 | } |
1da177e4 | 2100 | |
9d36d9e5 | 2101 | if (prio_allocate) |
ed76f5ed VB |
2102 | prio = tcf_auto_prio(tcf_chain_tp_prev(chain, |
2103 | &chain_info)); | |
1da177e4 | 2104 | |
ed76f5ed | 2105 | mutex_unlock(&chain->filter_chain_lock); |
8b64678e | 2106 | tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]), |
12db03b6 VB |
2107 | protocol, prio, chain, rtnl_held, |
2108 | extack); | |
8b64678e VB |
2109 | if (IS_ERR(tp_new)) { |
2110 | err = PTR_ERR(tp_new); | |
726d0612 | 2111 | goto errout_tp; |
1da177e4 | 2112 | } |
ed76f5ed | 2113 | |
12186be7 | 2114 | tp_created = 1; |
12db03b6 VB |
2115 | tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio, |
2116 | rtnl_held); | |
726d0612 VB |
2117 | if (IS_ERR(tp)) { |
2118 | err = PTR_ERR(tp); | |
2119 | goto errout_tp; | |
2120 | } | |
ed76f5ed VB |
2121 | } else { |
2122 | mutex_unlock(&chain->filter_chain_lock); | |
6bb16e7a | 2123 | } |
1da177e4 | 2124 | |
8b64678e VB |
2125 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2126 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2127 | err = -EINVAL; | |
2128 | goto errout; | |
2129 | } | |
2130 | ||
1da177e4 LT |
2131 | fh = tp->ops->get(tp, t->tcm_handle); |
2132 | ||
8113c095 | 2133 | if (!fh) { |
c431f89b | 2134 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
c35a4acc | 2135 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter"); |
6bb16e7a | 2136 | err = -ENOENT; |
1da177e4 | 2137 | goto errout; |
6bb16e7a | 2138 | } |
c431f89b | 2139 | } else if (n->nlmsg_flags & NLM_F_EXCL) { |
7d5509fa | 2140 | tfilter_put(tp, fh); |
c431f89b VB |
2141 | NL_SET_ERR_MSG(extack, "Filter already exists"); |
2142 | err = -EEXIST; | |
2143 | goto errout; | |
1da177e4 LT |
2144 | } |
2145 | ||
9f407f17 JP |
2146 | if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) { |
2147 | NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind"); | |
2148 | err = -EINVAL; | |
2149 | goto errout; | |
2150 | } | |
2151 | ||
2f7ef2f8 | 2152 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
7306db38 | 2153 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE, |
12db03b6 | 2154 | rtnl_held, extack); |
7d5509fa | 2155 | if (err == 0) { |
7960d1da | 2156 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2157 | RTM_NEWTFILTER, false, rtnl_held); |
7d5509fa | 2158 | tfilter_put(tp, fh); |
503d81d4 VB |
2159 | /* q pointer is NULL for shared blocks */ |
2160 | if (q) | |
2161 | q->flags &= ~TCQ_F_CAN_BYPASS; | |
7d5509fa | 2162 | } |
1da177e4 LT |
2163 | |
2164 | errout: | |
8b64678e | 2165 | if (err && tp_created) |
12db03b6 | 2166 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL); |
726d0612 | 2167 | errout_tp: |
4dbfa766 VB |
2168 | if (chain) { |
2169 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2170 | tcf_proto_put(tp, rtnl_held, NULL); |
4dbfa766 VB |
2171 | if (!tp_created) |
2172 | tcf_chain_put(chain); | |
2173 | } | |
12db03b6 | 2174 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2175 | |
2176 | if (rtnl_held) | |
2177 | rtnl_unlock(); | |
2178 | ||
2179 | if (err == -EAGAIN) { | |
2180 | /* Take rtnl lock in case EAGAIN is caused by concurrent flush | |
2181 | * of target chain. | |
2182 | */ | |
2183 | rtnl_held = true; | |
1da177e4 LT |
2184 | /* Replay the request. */ |
2185 | goto replay; | |
470502de | 2186 | } |
1da177e4 | 2187 | return err; |
ed76f5ed VB |
2188 | |
2189 | errout_locked: | |
2190 | mutex_unlock(&chain->filter_chain_lock); | |
2191 | goto errout; | |
1da177e4 LT |
2192 | } |
2193 | ||
c431f89b VB |
2194 | static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
2195 | struct netlink_ext_ack *extack) | |
2196 | { | |
2197 | struct net *net = sock_net(skb->sk); | |
2198 | struct nlattr *tca[TCA_MAX + 1]; | |
2199 | struct tcmsg *t; | |
2200 | u32 protocol; | |
2201 | u32 prio; | |
2202 | u32 parent; | |
2203 | u32 chain_index; | |
2204 | struct Qdisc *q = NULL; | |
2205 | struct tcf_chain_info chain_info; | |
2206 | struct tcf_chain *chain = NULL; | |
470502de | 2207 | struct tcf_block *block = NULL; |
c431f89b VB |
2208 | struct tcf_proto *tp = NULL; |
2209 | unsigned long cl = 0; | |
2210 | void *fh = NULL; | |
2211 | int err; | |
470502de | 2212 | bool rtnl_held = false; |
c431f89b VB |
2213 | |
2214 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2215 | return -EPERM; | |
2216 | ||
8cb08174 JB |
2217 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2218 | rtm_tca_policy, extack); | |
c431f89b VB |
2219 | if (err < 0) |
2220 | return err; | |
2221 | ||
2222 | t = nlmsg_data(n); | |
2223 | protocol = TC_H_MIN(t->tcm_info); | |
2224 | prio = TC_H_MAJ(t->tcm_info); | |
2225 | parent = t->tcm_parent; | |
2226 | ||
2227 | if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) { | |
2228 | NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set"); | |
2229 | return -ENOENT; | |
2230 | } | |
2231 | ||
2232 | /* Find head of filter chain. */ | |
2233 | ||
470502de VB |
2234 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2235 | if (err) | |
2236 | return err; | |
2237 | ||
2238 | /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc | |
2239 | * found), qdisc is not unlocked, classifier type is not specified, | |
2240 | * classifier is not unlocked. | |
2241 | */ | |
2242 | if (!prio || | |
2243 | (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2244 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2245 | rtnl_held = true; | |
2246 | rtnl_lock(); | |
2247 | } | |
2248 | ||
2249 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2250 | if (err) | |
2251 | goto errout; | |
2252 | ||
2253 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2254 | extack); | |
c431f89b VB |
2255 | if (IS_ERR(block)) { |
2256 | err = PTR_ERR(block); | |
2257 | goto errout; | |
2258 | } | |
2259 | ||
2260 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2261 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2262 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2263 | err = -EINVAL; | |
2264 | goto errout; | |
2265 | } | |
2266 | chain = tcf_chain_get(block, chain_index, false); | |
2267 | if (!chain) { | |
5ca8a25c JP |
2268 | /* User requested flush on non-existent chain. Nothing to do, |
2269 | * so just return success. | |
2270 | */ | |
2271 | if (prio == 0) { | |
2272 | err = 0; | |
2273 | goto errout; | |
2274 | } | |
c431f89b | 2275 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
b7b4247d | 2276 | err = -ENOENT; |
c431f89b VB |
2277 | goto errout; |
2278 | } | |
2279 | ||
2280 | if (prio == 0) { | |
2281 | tfilter_notify_chain(net, skb, block, q, parent, n, | |
12db03b6 VB |
2282 | chain, RTM_DELTFILTER, rtnl_held); |
2283 | tcf_chain_flush(chain, rtnl_held); | |
c431f89b VB |
2284 | err = 0; |
2285 | goto errout; | |
2286 | } | |
2287 | ||
ed76f5ed | 2288 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2289 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2290 | prio, false); | |
2291 | if (!tp || IS_ERR(tp)) { | |
2292 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2293 | err = tp ? PTR_ERR(tp) : -ENOENT; |
ed76f5ed | 2294 | goto errout_locked; |
c431f89b VB |
2295 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
2296 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2297 | err = -EINVAL; | |
ed76f5ed VB |
2298 | goto errout_locked; |
2299 | } else if (t->tcm_handle == 0) { | |
2300 | tcf_chain_tp_remove(chain, &chain_info, tp); | |
2301 | mutex_unlock(&chain->filter_chain_lock); | |
2302 | ||
12db03b6 | 2303 | tcf_proto_put(tp, rtnl_held, NULL); |
ed76f5ed | 2304 | tfilter_notify(net, skb, n, tp, block, q, parent, fh, |
12db03b6 | 2305 | RTM_DELTFILTER, false, rtnl_held); |
ed76f5ed | 2306 | err = 0; |
c431f89b VB |
2307 | goto errout; |
2308 | } | |
ed76f5ed | 2309 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2310 | |
2311 | fh = tp->ops->get(tp, t->tcm_handle); | |
2312 | ||
2313 | if (!fh) { | |
ed76f5ed VB |
2314 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); |
2315 | err = -ENOENT; | |
c431f89b VB |
2316 | } else { |
2317 | bool last; | |
2318 | ||
2319 | err = tfilter_del_notify(net, skb, n, tp, block, | |
2320 | q, parent, fh, false, &last, | |
12db03b6 VB |
2321 | rtnl_held, extack); |
2322 | ||
c431f89b VB |
2323 | if (err) |
2324 | goto errout; | |
8b64678e | 2325 | if (last) |
12db03b6 | 2326 | tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack); |
c431f89b VB |
2327 | } |
2328 | ||
2329 | errout: | |
4dbfa766 VB |
2330 | if (chain) { |
2331 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2332 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2333 | tcf_chain_put(chain); |
4dbfa766 | 2334 | } |
12db03b6 | 2335 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2336 | |
2337 | if (rtnl_held) | |
2338 | rtnl_unlock(); | |
2339 | ||
c431f89b | 2340 | return err; |
ed76f5ed VB |
2341 | |
2342 | errout_locked: | |
2343 | mutex_unlock(&chain->filter_chain_lock); | |
2344 | goto errout; | |
c431f89b VB |
2345 | } |
2346 | ||
2347 | static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n, | |
2348 | struct netlink_ext_ack *extack) | |
2349 | { | |
2350 | struct net *net = sock_net(skb->sk); | |
2351 | struct nlattr *tca[TCA_MAX + 1]; | |
2352 | struct tcmsg *t; | |
2353 | u32 protocol; | |
2354 | u32 prio; | |
2355 | u32 parent; | |
2356 | u32 chain_index; | |
2357 | struct Qdisc *q = NULL; | |
2358 | struct tcf_chain_info chain_info; | |
2359 | struct tcf_chain *chain = NULL; | |
470502de | 2360 | struct tcf_block *block = NULL; |
c431f89b VB |
2361 | struct tcf_proto *tp = NULL; |
2362 | unsigned long cl = 0; | |
2363 | void *fh = NULL; | |
2364 | int err; | |
470502de | 2365 | bool rtnl_held = false; |
c431f89b | 2366 | |
8cb08174 JB |
2367 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2368 | rtm_tca_policy, extack); | |
c431f89b VB |
2369 | if (err < 0) |
2370 | return err; | |
2371 | ||
2372 | t = nlmsg_data(n); | |
2373 | protocol = TC_H_MIN(t->tcm_info); | |
2374 | prio = TC_H_MAJ(t->tcm_info); | |
2375 | parent = t->tcm_parent; | |
2376 | ||
2377 | if (prio == 0) { | |
2378 | NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero"); | |
2379 | return -ENOENT; | |
2380 | } | |
2381 | ||
2382 | /* Find head of filter chain. */ | |
2383 | ||
470502de VB |
2384 | err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack); |
2385 | if (err) | |
2386 | return err; | |
2387 | ||
2388 | /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not | |
2389 | * unlocked, classifier type is not specified, classifier is not | |
2390 | * unlocked. | |
2391 | */ | |
2392 | if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) || | |
2393 | !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) { | |
2394 | rtnl_held = true; | |
2395 | rtnl_lock(); | |
2396 | } | |
2397 | ||
2398 | err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack); | |
2399 | if (err) | |
2400 | goto errout; | |
2401 | ||
2402 | block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index, | |
2403 | extack); | |
c431f89b VB |
2404 | if (IS_ERR(block)) { |
2405 | err = PTR_ERR(block); | |
2406 | goto errout; | |
2407 | } | |
2408 | ||
2409 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2410 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2411 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
2412 | err = -EINVAL; | |
2413 | goto errout; | |
2414 | } | |
2415 | chain = tcf_chain_get(block, chain_index, false); | |
2416 | if (!chain) { | |
2417 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); | |
2418 | err = -EINVAL; | |
2419 | goto errout; | |
2420 | } | |
2421 | ||
ed76f5ed | 2422 | mutex_lock(&chain->filter_chain_lock); |
c431f89b VB |
2423 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
2424 | prio, false); | |
ed76f5ed | 2425 | mutex_unlock(&chain->filter_chain_lock); |
c431f89b VB |
2426 | if (!tp || IS_ERR(tp)) { |
2427 | NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found"); | |
0e399035 | 2428 | err = tp ? PTR_ERR(tp) : -ENOENT; |
c431f89b VB |
2429 | goto errout; |
2430 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { | |
2431 | NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one"); | |
2432 | err = -EINVAL; | |
2433 | goto errout; | |
2434 | } | |
2435 | ||
2436 | fh = tp->ops->get(tp, t->tcm_handle); | |
2437 | ||
2438 | if (!fh) { | |
2439 | NL_SET_ERR_MSG(extack, "Specified filter handle not found"); | |
2440 | err = -ENOENT; | |
2441 | } else { | |
2442 | err = tfilter_notify(net, skb, n, tp, block, q, parent, | |
12db03b6 | 2443 | fh, RTM_NEWTFILTER, true, rtnl_held); |
c431f89b VB |
2444 | if (err < 0) |
2445 | NL_SET_ERR_MSG(extack, "Failed to send filter notify message"); | |
2446 | } | |
2447 | ||
7d5509fa | 2448 | tfilter_put(tp, fh); |
c431f89b | 2449 | errout: |
4dbfa766 VB |
2450 | if (chain) { |
2451 | if (tp && !IS_ERR(tp)) | |
12db03b6 | 2452 | tcf_proto_put(tp, rtnl_held, NULL); |
c431f89b | 2453 | tcf_chain_put(chain); |
4dbfa766 | 2454 | } |
12db03b6 | 2455 | tcf_block_release(q, block, rtnl_held); |
470502de VB |
2456 | |
2457 | if (rtnl_held) | |
2458 | rtnl_unlock(); | |
2459 | ||
c431f89b VB |
2460 | return err; |
2461 | } | |
2462 | ||
aa767bfe | 2463 | struct tcf_dump_args { |
1da177e4 LT |
2464 | struct tcf_walker w; |
2465 | struct sk_buff *skb; | |
2466 | struct netlink_callback *cb; | |
7960d1da | 2467 | struct tcf_block *block; |
a10fa201 JP |
2468 | struct Qdisc *q; |
2469 | u32 parent; | |
1da177e4 LT |
2470 | }; |
2471 | ||
8113c095 | 2472 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 2473 | { |
aa767bfe | 2474 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 2475 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 2476 | |
7960d1da | 2477 | return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent, |
a10fa201 | 2478 | n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 | 2479 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
12db03b6 | 2480 | RTM_NEWTFILTER, true); |
1da177e4 LT |
2481 | } |
2482 | ||
a10fa201 JP |
2483 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
2484 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
2485 | long index_start, long *p_index) |
2486 | { | |
2487 | struct net *net = sock_net(skb->sk); | |
7960d1da | 2488 | struct tcf_block *block = chain->block; |
acb31fae | 2489 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
fe2923af | 2490 | struct tcf_proto *tp, *tp_prev; |
acb31fae | 2491 | struct tcf_dump_args arg; |
acb31fae | 2492 | |
fe2923af VB |
2493 | for (tp = __tcf_get_next_proto(chain, NULL); |
2494 | tp; | |
2495 | tp_prev = tp, | |
2496 | tp = __tcf_get_next_proto(chain, tp), | |
12db03b6 | 2497 | tcf_proto_put(tp_prev, true, NULL), |
fe2923af | 2498 | (*p_index)++) { |
acb31fae JP |
2499 | if (*p_index < index_start) |
2500 | continue; | |
2501 | if (TC_H_MAJ(tcm->tcm_info) && | |
2502 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
2503 | continue; | |
2504 | if (TC_H_MIN(tcm->tcm_info) && | |
2505 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
2506 | continue; | |
2507 | if (*p_index > index_start) | |
2508 | memset(&cb->args[1], 0, | |
2509 | sizeof(cb->args) - sizeof(cb->args[0])); | |
2510 | if (cb->args[1] == 0) { | |
53189183 | 2511 | if (tcf_fill_node(net, skb, tp, block, q, parent, NULL, |
acb31fae JP |
2512 | NETLINK_CB(cb->skb).portid, |
2513 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
12db03b6 | 2514 | RTM_NEWTFILTER, true) <= 0) |
fe2923af | 2515 | goto errout; |
acb31fae JP |
2516 | cb->args[1] = 1; |
2517 | } | |
2518 | if (!tp->ops->walk) | |
2519 | continue; | |
2520 | arg.w.fn = tcf_node_dump; | |
2521 | arg.skb = skb; | |
2522 | arg.cb = cb; | |
7960d1da | 2523 | arg.block = block; |
a10fa201 JP |
2524 | arg.q = q; |
2525 | arg.parent = parent; | |
acb31fae JP |
2526 | arg.w.stop = 0; |
2527 | arg.w.skip = cb->args[1] - 1; | |
2528 | arg.w.count = 0; | |
01683a14 | 2529 | arg.w.cookie = cb->args[2]; |
12db03b6 | 2530 | tp->ops->walk(tp, &arg.w, true); |
01683a14 | 2531 | cb->args[2] = arg.w.cookie; |
acb31fae JP |
2532 | cb->args[1] = arg.w.count + 1; |
2533 | if (arg.w.stop) | |
fe2923af | 2534 | goto errout; |
acb31fae | 2535 | } |
5bc17018 | 2536 | return true; |
fe2923af VB |
2537 | |
2538 | errout: | |
12db03b6 | 2539 | tcf_proto_put(tp, true, NULL); |
fe2923af | 2540 | return false; |
acb31fae JP |
2541 | } |
2542 | ||
bd27a875 | 2543 | /* called with RTNL */ |
1da177e4 LT |
2544 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
2545 | { | |
bbf73830 | 2546 | struct tcf_chain *chain, *chain_prev; |
3b1e0a65 | 2547 | struct net *net = sock_net(skb->sk); |
5bc17018 | 2548 | struct nlattr *tca[TCA_MAX + 1]; |
7960d1da | 2549 | struct Qdisc *q = NULL; |
6529eaba | 2550 | struct tcf_block *block; |
942b8165 | 2551 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
acb31fae JP |
2552 | long index_start; |
2553 | long index; | |
a10fa201 | 2554 | u32 parent; |
5bc17018 | 2555 | int err; |
1da177e4 | 2556 | |
573ce260 | 2557 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2558 | return skb->len; |
5bc17018 | 2559 | |
8cb08174 JB |
2560 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2561 | NULL, cb->extack); | |
5bc17018 JP |
2562 | if (err) |
2563 | return err; | |
2564 | ||
7960d1da | 2565 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { |
787ce6d0 | 2566 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
7960d1da JP |
2567 | if (!block) |
2568 | goto out; | |
d680b352 JP |
2569 | /* If we work with block index, q is NULL and parent value |
2570 | * will never be used in the following code. The check | |
2571 | * in tcf_fill_node prevents it. However, compiler does not | |
2572 | * see that far, so set parent to zero to silence the warning | |
2573 | * about parent being uninitialized. | |
2574 | */ | |
2575 | parent = 0; | |
a10fa201 | 2576 | } else { |
7960d1da JP |
2577 | const struct Qdisc_class_ops *cops; |
2578 | struct net_device *dev; | |
2579 | unsigned long cl = 0; | |
2580 | ||
2581 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2582 | if (!dev) | |
2583 | return skb->len; | |
2584 | ||
2585 | parent = tcm->tcm_parent; | |
2586 | if (!parent) { | |
2587 | q = dev->qdisc; | |
2588 | parent = q->handle; | |
2589 | } else { | |
2590 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2591 | } | |
2592 | if (!q) | |
2593 | goto out; | |
2594 | cops = q->ops->cl_ops; | |
2595 | if (!cops) | |
143976ce | 2596 | goto out; |
7960d1da JP |
2597 | if (!cops->tcf_block) |
2598 | goto out; | |
2599 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2600 | cl = cops->find(q, tcm->tcm_parent); | |
2601 | if (cl == 0) | |
2602 | goto out; | |
2603 | } | |
2604 | block = cops->tcf_block(q, cl, NULL); | |
2605 | if (!block) | |
2606 | goto out; | |
2607 | if (tcf_block_shared(block)) | |
2608 | q = NULL; | |
1da177e4 | 2609 | } |
1da177e4 | 2610 | |
acb31fae JP |
2611 | index_start = cb->args[0]; |
2612 | index = 0; | |
5bc17018 | 2613 | |
bbf73830 VB |
2614 | for (chain = __tcf_get_next_chain(block, NULL); |
2615 | chain; | |
2616 | chain_prev = chain, | |
2617 | chain = __tcf_get_next_chain(block, chain), | |
2618 | tcf_chain_put(chain_prev)) { | |
5bc17018 JP |
2619 | if (tca[TCA_CHAIN] && |
2620 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
2621 | continue; | |
a10fa201 | 2622 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
5ae437ad | 2623 | index_start, &index)) { |
bbf73830 | 2624 | tcf_chain_put(chain); |
5ae437ad | 2625 | err = -EMSGSIZE; |
5bc17018 | 2626 | break; |
5ae437ad | 2627 | } |
5bc17018 JP |
2628 | } |
2629 | ||
787ce6d0 | 2630 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 2631 | tcf_block_refcnt_put(block, true); |
acb31fae | 2632 | cb->args[0] = index; |
1da177e4 | 2633 | |
1da177e4 | 2634 | out: |
5ae437ad RK |
2635 | /* If we did no progress, the error (EMSGSIZE) is real */ |
2636 | if (skb->len == 0 && err) | |
2637 | return err; | |
1da177e4 LT |
2638 | return skb->len; |
2639 | } | |
2640 | ||
a5654820 VB |
2641 | static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, |
2642 | void *tmplt_priv, u32 chain_index, | |
2643 | struct net *net, struct sk_buff *skb, | |
2644 | struct tcf_block *block, | |
32a4f5ec JP |
2645 | u32 portid, u32 seq, u16 flags, int event) |
2646 | { | |
2647 | unsigned char *b = skb_tail_pointer(skb); | |
9f407f17 | 2648 | const struct tcf_proto_ops *ops; |
32a4f5ec JP |
2649 | struct nlmsghdr *nlh; |
2650 | struct tcmsg *tcm; | |
9f407f17 JP |
2651 | void *priv; |
2652 | ||
a5654820 VB |
2653 | ops = tmplt_ops; |
2654 | priv = tmplt_priv; | |
32a4f5ec JP |
2655 | |
2656 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
2657 | if (!nlh) | |
2658 | goto out_nlmsg_trim; | |
2659 | tcm = nlmsg_data(nlh); | |
2660 | tcm->tcm_family = AF_UNSPEC; | |
2661 | tcm->tcm__pad1 = 0; | |
2662 | tcm->tcm__pad2 = 0; | |
2663 | tcm->tcm_handle = 0; | |
2664 | if (block->q) { | |
2665 | tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; | |
2666 | tcm->tcm_parent = block->q->handle; | |
2667 | } else { | |
2668 | tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK; | |
2669 | tcm->tcm_block_index = block->index; | |
2670 | } | |
2671 | ||
a5654820 | 2672 | if (nla_put_u32(skb, TCA_CHAIN, chain_index)) |
32a4f5ec JP |
2673 | goto nla_put_failure; |
2674 | ||
9f407f17 JP |
2675 | if (ops) { |
2676 | if (nla_put_string(skb, TCA_KIND, ops->kind)) | |
2677 | goto nla_put_failure; | |
2678 | if (ops->tmplt_dump(skb, net, priv) < 0) | |
2679 | goto nla_put_failure; | |
2680 | } | |
2681 | ||
32a4f5ec JP |
2682 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
2683 | return skb->len; | |
2684 | ||
2685 | out_nlmsg_trim: | |
2686 | nla_put_failure: | |
2687 | nlmsg_trim(skb, b); | |
2688 | return -EMSGSIZE; | |
2689 | } | |
2690 | ||
2691 | static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb, | |
2692 | u32 seq, u16 flags, int event, bool unicast) | |
2693 | { | |
2694 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2695 | struct tcf_block *block = chain->block; | |
2696 | struct net *net = block->net; | |
2697 | struct sk_buff *skb; | |
5b5f99b1 | 2698 | int err = 0; |
32a4f5ec JP |
2699 | |
2700 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2701 | if (!skb) | |
2702 | return -ENOBUFS; | |
2703 | ||
a5654820 VB |
2704 | if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
2705 | chain->index, net, skb, block, portid, | |
32a4f5ec JP |
2706 | seq, flags, event) <= 0) { |
2707 | kfree_skb(skb); | |
2708 | return -EINVAL; | |
2709 | } | |
2710 | ||
2711 | if (unicast) | |
5b5f99b1 ZW |
2712 | err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); |
2713 | else | |
2714 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
2715 | flags & NLM_F_ECHO); | |
32a4f5ec | 2716 | |
5b5f99b1 ZW |
2717 | if (err > 0) |
2718 | err = 0; | |
2719 | return err; | |
32a4f5ec JP |
2720 | } |
2721 | ||
a5654820 VB |
2722 | static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops, |
2723 | void *tmplt_priv, u32 chain_index, | |
2724 | struct tcf_block *block, struct sk_buff *oskb, | |
2725 | u32 seq, u16 flags, bool unicast) | |
2726 | { | |
2727 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
2728 | struct net *net = block->net; | |
2729 | struct sk_buff *skb; | |
2730 | ||
2731 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2732 | if (!skb) | |
2733 | return -ENOBUFS; | |
2734 | ||
2735 | if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb, | |
2736 | block, portid, seq, flags, RTM_DELCHAIN) <= 0) { | |
2737 | kfree_skb(skb); | |
2738 | return -EINVAL; | |
2739 | } | |
2740 | ||
2741 | if (unicast) | |
2742 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
2743 | ||
2744 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); | |
2745 | } | |
2746 | ||
9f407f17 JP |
2747 | static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net, |
2748 | struct nlattr **tca, | |
2749 | struct netlink_ext_ack *extack) | |
2750 | { | |
2751 | const struct tcf_proto_ops *ops; | |
2752 | void *tmplt_priv; | |
2753 | ||
2754 | /* If kind is not set, user did not specify template. */ | |
2755 | if (!tca[TCA_KIND]) | |
2756 | return 0; | |
2757 | ||
12db03b6 | 2758 | ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack); |
9f407f17 JP |
2759 | if (IS_ERR(ops)) |
2760 | return PTR_ERR(ops); | |
2761 | if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) { | |
2762 | NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier"); | |
2763 | return -EOPNOTSUPP; | |
2764 | } | |
2765 | ||
2766 | tmplt_priv = ops->tmplt_create(net, chain, tca, extack); | |
2767 | if (IS_ERR(tmplt_priv)) { | |
2768 | module_put(ops->owner); | |
2769 | return PTR_ERR(tmplt_priv); | |
2770 | } | |
2771 | chain->tmplt_ops = ops; | |
2772 | chain->tmplt_priv = tmplt_priv; | |
2773 | return 0; | |
2774 | } | |
2775 | ||
a5654820 VB |
2776 | static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops, |
2777 | void *tmplt_priv) | |
9f407f17 | 2778 | { |
9f407f17 | 2779 | /* If template ops are set, no work to do for us. */ |
a5654820 | 2780 | if (!tmplt_ops) |
9f407f17 JP |
2781 | return; |
2782 | ||
a5654820 VB |
2783 | tmplt_ops->tmplt_destroy(tmplt_priv); |
2784 | module_put(tmplt_ops->owner); | |
9f407f17 JP |
2785 | } |
2786 | ||
32a4f5ec JP |
2787 | /* Add/delete/get a chain */ |
2788 | ||
2789 | static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n, | |
2790 | struct netlink_ext_ack *extack) | |
2791 | { | |
2792 | struct net *net = sock_net(skb->sk); | |
2793 | struct nlattr *tca[TCA_MAX + 1]; | |
2794 | struct tcmsg *t; | |
2795 | u32 parent; | |
2796 | u32 chain_index; | |
2797 | struct Qdisc *q = NULL; | |
2798 | struct tcf_chain *chain = NULL; | |
2799 | struct tcf_block *block; | |
2800 | unsigned long cl; | |
2801 | int err; | |
2802 | ||
2803 | if (n->nlmsg_type != RTM_GETCHAIN && | |
2804 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) | |
2805 | return -EPERM; | |
2806 | ||
2807 | replay: | |
8cb08174 JB |
2808 | err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX, |
2809 | rtm_tca_policy, extack); | |
32a4f5ec JP |
2810 | if (err < 0) |
2811 | return err; | |
2812 | ||
2813 | t = nlmsg_data(n); | |
2814 | parent = t->tcm_parent; | |
2815 | cl = 0; | |
2816 | ||
2817 | block = tcf_block_find(net, &q, &parent, &cl, | |
2818 | t->tcm_ifindex, t->tcm_block_index, extack); | |
2819 | if (IS_ERR(block)) | |
2820 | return PTR_ERR(block); | |
2821 | ||
2822 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
2823 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
2824 | NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit"); | |
e368fdb6 VB |
2825 | err = -EINVAL; |
2826 | goto errout_block; | |
32a4f5ec | 2827 | } |
2cbfab07 VB |
2828 | |
2829 | mutex_lock(&block->lock); | |
32a4f5ec JP |
2830 | chain = tcf_chain_lookup(block, chain_index); |
2831 | if (n->nlmsg_type == RTM_NEWCHAIN) { | |
2832 | if (chain) { | |
3d32f4c5 | 2833 | if (tcf_chain_held_by_acts_only(chain)) { |
1f3ed383 | 2834 | /* The chain exists only because there is |
3d32f4c5 | 2835 | * some action referencing it. |
1f3ed383 JP |
2836 | */ |
2837 | tcf_chain_hold(chain); | |
2838 | } else { | |
2839 | NL_SET_ERR_MSG(extack, "Filter chain already exists"); | |
e368fdb6 | 2840 | err = -EEXIST; |
2cbfab07 | 2841 | goto errout_block_locked; |
1f3ed383 JP |
2842 | } |
2843 | } else { | |
2844 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
2845 | NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain"); | |
e368fdb6 | 2846 | err = -ENOENT; |
2cbfab07 | 2847 | goto errout_block_locked; |
1f3ed383 JP |
2848 | } |
2849 | chain = tcf_chain_create(block, chain_index); | |
2850 | if (!chain) { | |
2851 | NL_SET_ERR_MSG(extack, "Failed to create filter chain"); | |
e368fdb6 | 2852 | err = -ENOMEM; |
2cbfab07 | 2853 | goto errout_block_locked; |
1f3ed383 | 2854 | } |
32a4f5ec JP |
2855 | } |
2856 | } else { | |
3d32f4c5 | 2857 | if (!chain || tcf_chain_held_by_acts_only(chain)) { |
32a4f5ec | 2858 | NL_SET_ERR_MSG(extack, "Cannot find specified filter chain"); |
e368fdb6 | 2859 | err = -EINVAL; |
2cbfab07 | 2860 | goto errout_block_locked; |
32a4f5ec JP |
2861 | } |
2862 | tcf_chain_hold(chain); | |
2863 | } | |
2864 | ||
2cbfab07 VB |
2865 | if (n->nlmsg_type == RTM_NEWCHAIN) { |
2866 | /* Modifying chain requires holding parent block lock. In case | |
2867 | * the chain was successfully added, take a reference to the | |
2868 | * chain. This ensures that an empty chain does not disappear at | |
2869 | * the end of this function. | |
2870 | */ | |
2871 | tcf_chain_hold(chain); | |
2872 | chain->explicitly_created = true; | |
2873 | } | |
2874 | mutex_unlock(&block->lock); | |
2875 | ||
32a4f5ec JP |
2876 | switch (n->nlmsg_type) { |
2877 | case RTM_NEWCHAIN: | |
9f407f17 | 2878 | err = tc_chain_tmplt_add(chain, net, tca, extack); |
2cbfab07 VB |
2879 | if (err) { |
2880 | tcf_chain_put_explicitly_created(chain); | |
9f407f17 | 2881 | goto errout; |
2cbfab07 VB |
2882 | } |
2883 | ||
32a4f5ec JP |
2884 | tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL, |
2885 | RTM_NEWCHAIN, false); | |
2886 | break; | |
2887 | case RTM_DELCHAIN: | |
f5b9bac7 | 2888 | tfilter_notify_chain(net, skb, block, q, parent, n, |
12db03b6 | 2889 | chain, RTM_DELTFILTER, true); |
32a4f5ec | 2890 | /* Flush the chain first as the user requested chain removal. */ |
12db03b6 | 2891 | tcf_chain_flush(chain, true); |
32a4f5ec JP |
2892 | /* In case the chain was successfully deleted, put a reference |
2893 | * to the chain previously taken during addition. | |
2894 | */ | |
2895 | tcf_chain_put_explicitly_created(chain); | |
2896 | break; | |
2897 | case RTM_GETCHAIN: | |
32a4f5ec JP |
2898 | err = tc_chain_notify(chain, skb, n->nlmsg_seq, |
2899 | n->nlmsg_seq, n->nlmsg_type, true); | |
2900 | if (err < 0) | |
2901 | NL_SET_ERR_MSG(extack, "Failed to send chain notify message"); | |
2902 | break; | |
2903 | default: | |
2904 | err = -EOPNOTSUPP; | |
2905 | NL_SET_ERR_MSG(extack, "Unsupported message type"); | |
2906 | goto errout; | |
2907 | } | |
2908 | ||
2909 | errout: | |
2910 | tcf_chain_put(chain); | |
e368fdb6 | 2911 | errout_block: |
12db03b6 | 2912 | tcf_block_release(q, block, true); |
32a4f5ec JP |
2913 | if (err == -EAGAIN) |
2914 | /* Replay the request. */ | |
2915 | goto replay; | |
2916 | return err; | |
2cbfab07 VB |
2917 | |
2918 | errout_block_locked: | |
2919 | mutex_unlock(&block->lock); | |
2920 | goto errout_block; | |
32a4f5ec JP |
2921 | } |
2922 | ||
2923 | /* called with RTNL */ | |
2924 | static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb) | |
2925 | { | |
2926 | struct net *net = sock_net(skb->sk); | |
2927 | struct nlattr *tca[TCA_MAX + 1]; | |
2928 | struct Qdisc *q = NULL; | |
2929 | struct tcf_block *block; | |
32a4f5ec | 2930 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
ace4a267 | 2931 | struct tcf_chain *chain; |
32a4f5ec JP |
2932 | long index_start; |
2933 | long index; | |
2934 | u32 parent; | |
2935 | int err; | |
2936 | ||
2937 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) | |
2938 | return skb->len; | |
2939 | ||
8cb08174 JB |
2940 | err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX, |
2941 | rtm_tca_policy, cb->extack); | |
32a4f5ec JP |
2942 | if (err) |
2943 | return err; | |
2944 | ||
2945 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) { | |
787ce6d0 | 2946 | block = tcf_block_refcnt_get(net, tcm->tcm_block_index); |
32a4f5ec JP |
2947 | if (!block) |
2948 | goto out; | |
2949 | /* If we work with block index, q is NULL and parent value | |
2950 | * will never be used in the following code. The check | |
2951 | * in tcf_fill_node prevents it. However, compiler does not | |
2952 | * see that far, so set parent to zero to silence the warning | |
2953 | * about parent being uninitialized. | |
2954 | */ | |
2955 | parent = 0; | |
2956 | } else { | |
2957 | const struct Qdisc_class_ops *cops; | |
2958 | struct net_device *dev; | |
2959 | unsigned long cl = 0; | |
2960 | ||
2961 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); | |
2962 | if (!dev) | |
2963 | return skb->len; | |
2964 | ||
2965 | parent = tcm->tcm_parent; | |
2966 | if (!parent) { | |
2967 | q = dev->qdisc; | |
2968 | parent = q->handle; | |
2969 | } else { | |
2970 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
2971 | } | |
2972 | if (!q) | |
2973 | goto out; | |
2974 | cops = q->ops->cl_ops; | |
2975 | if (!cops) | |
2976 | goto out; | |
2977 | if (!cops->tcf_block) | |
2978 | goto out; | |
2979 | if (TC_H_MIN(tcm->tcm_parent)) { | |
2980 | cl = cops->find(q, tcm->tcm_parent); | |
2981 | if (cl == 0) | |
2982 | goto out; | |
2983 | } | |
2984 | block = cops->tcf_block(q, cl, NULL); | |
2985 | if (!block) | |
2986 | goto out; | |
2987 | if (tcf_block_shared(block)) | |
2988 | q = NULL; | |
2989 | } | |
2990 | ||
2991 | index_start = cb->args[0]; | |
2992 | index = 0; | |
2993 | ||
ace4a267 VB |
2994 | mutex_lock(&block->lock); |
2995 | list_for_each_entry(chain, &block->chain_list, list) { | |
32a4f5ec JP |
2996 | if ((tca[TCA_CHAIN] && |
2997 | nla_get_u32(tca[TCA_CHAIN]) != chain->index)) | |
2998 | continue; | |
2999 | if (index < index_start) { | |
3000 | index++; | |
3001 | continue; | |
3002 | } | |
ace4a267 VB |
3003 | if (tcf_chain_held_by_acts_only(chain)) |
3004 | continue; | |
a5654820 VB |
3005 | err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv, |
3006 | chain->index, net, skb, block, | |
32a4f5ec JP |
3007 | NETLINK_CB(cb->skb).portid, |
3008 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
3009 | RTM_NEWCHAIN); | |
ace4a267 | 3010 | if (err <= 0) |
32a4f5ec JP |
3011 | break; |
3012 | index++; | |
3013 | } | |
ace4a267 | 3014 | mutex_unlock(&block->lock); |
32a4f5ec | 3015 | |
787ce6d0 | 3016 | if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) |
12db03b6 | 3017 | tcf_block_refcnt_put(block, true); |
32a4f5ec JP |
3018 | cb->args[0] = index; |
3019 | ||
3020 | out: | |
3021 | /* If we did no progress, the error (EMSGSIZE) is real */ | |
3022 | if (skb->len == 0 && err) | |
3023 | return err; | |
3024 | return skb->len; | |
3025 | } | |
3026 | ||
18d0264f | 3027 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
3028 | { |
3029 | #ifdef CONFIG_NET_CLS_ACT | |
90b73b77 | 3030 | tcf_action_destroy(exts->actions, TCA_ACT_UNBIND); |
22dc13c8 WC |
3031 | kfree(exts->actions); |
3032 | exts->nr_actions = 0; | |
1da177e4 LT |
3033 | #endif |
3034 | } | |
aa767bfe | 3035 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 3036 | |
c1b52739 | 3037 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
50a56190 | 3038 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr, |
ec6743a1 | 3039 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 3040 | { |
1da177e4 LT |
3041 | #ifdef CONFIG_NET_CLS_ACT |
3042 | { | |
1da177e4 | 3043 | struct tc_action *act; |
d04e6990 | 3044 | size_t attr_size = 0; |
1da177e4 | 3045 | |
5da57f42 | 3046 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
3047 | act = tcf_action_init_1(net, tp, tb[exts->police], |
3048 | rate_tlv, "police", ovr, | |
ec6743a1 VB |
3049 | TCA_ACT_BIND, rtnl_held, |
3050 | extack); | |
ab27cfb8 PM |
3051 | if (IS_ERR(act)) |
3052 | return PTR_ERR(act); | |
1da177e4 | 3053 | |
33be6271 | 3054 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
3055 | exts->actions[0] = act; |
3056 | exts->nr_actions = 1; | |
5da57f42 | 3057 | } else if (exts->action && tb[exts->action]) { |
90b73b77 | 3058 | int err; |
22dc13c8 | 3059 | |
9fb9f251 JP |
3060 | err = tcf_action_init(net, tp, tb[exts->action], |
3061 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
ec6743a1 VB |
3062 | exts->actions, &attr_size, |
3063 | rtnl_held, extack); | |
90b73b77 | 3064 | if (err < 0) |
33be6271 | 3065 | return err; |
90b73b77 | 3066 | exts->nr_actions = err; |
1da177e4 LT |
3067 | } |
3068 | } | |
1da177e4 | 3069 | #else |
5da57f42 | 3070 | if ((exts->action && tb[exts->action]) || |
50a56190 AA |
3071 | (exts->police && tb[exts->police])) { |
3072 | NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)"); | |
1da177e4 | 3073 | return -EOPNOTSUPP; |
50a56190 | 3074 | } |
1da177e4 LT |
3075 | #endif |
3076 | ||
3077 | return 0; | |
3078 | } | |
aa767bfe | 3079 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 3080 | |
9b0d4446 | 3081 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
3082 | { |
3083 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
3084 | struct tcf_exts old = *dst; |
3085 | ||
9b0d4446 | 3086 | *dst = *src; |
22dc13c8 | 3087 | tcf_exts_destroy(&old); |
1da177e4 LT |
3088 | #endif |
3089 | } | |
aa767bfe | 3090 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 3091 | |
22dc13c8 WC |
3092 | #ifdef CONFIG_NET_CLS_ACT |
3093 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
3094 | { | |
3095 | if (exts->nr_actions == 0) | |
3096 | return NULL; | |
3097 | else | |
3098 | return exts->actions[0]; | |
3099 | } | |
3100 | #endif | |
33be6271 | 3101 | |
5da57f42 | 3102 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3103 | { |
3104 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
3105 | struct nlattr *nest; |
3106 | ||
978dfd8d | 3107 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
3108 | /* |
3109 | * again for backward compatible mode - we want | |
3110 | * to work with both old and new modes of entering | |
3111 | * tc data even if iproute2 was newer - jhs | |
3112 | */ | |
33be6271 | 3113 | if (exts->type != TCA_OLD_COMPAT) { |
ae0be8de | 3114 | nest = nla_nest_start_noflag(skb, exts->action); |
4b3550ef PM |
3115 | if (nest == NULL) |
3116 | goto nla_put_failure; | |
22dc13c8 | 3117 | |
90b73b77 | 3118 | if (tcf_action_dump(skb, exts->actions, 0, 0) < 0) |
add93b61 | 3119 | goto nla_put_failure; |
4b3550ef | 3120 | nla_nest_end(skb, nest); |
5da57f42 | 3121 | } else if (exts->police) { |
33be6271 | 3122 | struct tc_action *act = tcf_exts_first_act(exts); |
ae0be8de | 3123 | nest = nla_nest_start_noflag(skb, exts->police); |
63acd680 | 3124 | if (nest == NULL || !act) |
4b3550ef | 3125 | goto nla_put_failure; |
33be6271 | 3126 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 3127 | goto nla_put_failure; |
4b3550ef | 3128 | nla_nest_end(skb, nest); |
1da177e4 LT |
3129 | } |
3130 | } | |
1da177e4 | 3131 | return 0; |
9cc63db5 CW |
3132 | |
3133 | nla_put_failure: | |
3134 | nla_nest_cancel(skb, nest); | |
1da177e4 | 3135 | return -1; |
9cc63db5 CW |
3136 | #else |
3137 | return 0; | |
3138 | #endif | |
1da177e4 | 3139 | } |
aa767bfe | 3140 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 3141 | |
aa767bfe | 3142 | |
5da57f42 | 3143 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
3144 | { |
3145 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 3146 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 3147 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 3148 | return -1; |
1da177e4 LT |
3149 | #endif |
3150 | return 0; | |
1da177e4 | 3151 | } |
aa767bfe | 3152 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 3153 | |
aeb3fecd CW |
3154 | int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type, |
3155 | void *type_data, bool err_stop) | |
717503b9 | 3156 | { |
955bcb6e | 3157 | struct flow_block_cb *block_cb; |
aeb3fecd CW |
3158 | int ok_count = 0; |
3159 | int err; | |
3160 | ||
3161 | /* Make sure all netdevs sharing this block are offload-capable. */ | |
3162 | if (block->nooffloaddevcnt && err_stop) | |
3163 | return -EOPNOTSUPP; | |
3164 | ||
14bfb13f | 3165 | list_for_each_entry(block_cb, &block->flow_block.cb_list, list) { |
aeb3fecd CW |
3166 | err = block_cb->cb(type, type_data, block_cb->cb_priv); |
3167 | if (err) { | |
3168 | if (err_stop) | |
3169 | return err; | |
3170 | } else { | |
3171 | ok_count++; | |
3172 | } | |
3173 | } | |
3174 | return ok_count; | |
717503b9 JP |
3175 | } |
3176 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 3177 | |
3a7b6861 PNA |
3178 | int tc_setup_flow_action(struct flow_action *flow_action, |
3179 | const struct tcf_exts *exts) | |
3180 | { | |
3181 | const struct tc_action *act; | |
3182 | int i, j, k; | |
3183 | ||
3184 | if (!exts) | |
3185 | return 0; | |
3186 | ||
3187 | j = 0; | |
3188 | tcf_exts_for_each_action(i, act, exts) { | |
3189 | struct flow_action_entry *entry; | |
3190 | ||
3191 | entry = &flow_action->entries[j]; | |
3192 | if (is_tcf_gact_ok(act)) { | |
3193 | entry->id = FLOW_ACTION_ACCEPT; | |
3194 | } else if (is_tcf_gact_shot(act)) { | |
3195 | entry->id = FLOW_ACTION_DROP; | |
3196 | } else if (is_tcf_gact_trap(act)) { | |
3197 | entry->id = FLOW_ACTION_TRAP; | |
3198 | } else if (is_tcf_gact_goto_chain(act)) { | |
3199 | entry->id = FLOW_ACTION_GOTO; | |
3200 | entry->chain_index = tcf_gact_goto_chain_index(act); | |
3201 | } else if (is_tcf_mirred_egress_redirect(act)) { | |
3202 | entry->id = FLOW_ACTION_REDIRECT; | |
3203 | entry->dev = tcf_mirred_dev(act); | |
3204 | } else if (is_tcf_mirred_egress_mirror(act)) { | |
3205 | entry->id = FLOW_ACTION_MIRRED; | |
3206 | entry->dev = tcf_mirred_dev(act); | |
3207 | } else if (is_tcf_vlan(act)) { | |
3208 | switch (tcf_vlan_action(act)) { | |
3209 | case TCA_VLAN_ACT_PUSH: | |
3210 | entry->id = FLOW_ACTION_VLAN_PUSH; | |
3211 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3212 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3213 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3214 | break; | |
3215 | case TCA_VLAN_ACT_POP: | |
3216 | entry->id = FLOW_ACTION_VLAN_POP; | |
3217 | break; | |
3218 | case TCA_VLAN_ACT_MODIFY: | |
3219 | entry->id = FLOW_ACTION_VLAN_MANGLE; | |
3220 | entry->vlan.vid = tcf_vlan_push_vid(act); | |
3221 | entry->vlan.proto = tcf_vlan_push_proto(act); | |
3222 | entry->vlan.prio = tcf_vlan_push_prio(act); | |
3223 | break; | |
3224 | default: | |
3225 | goto err_out; | |
3226 | } | |
3227 | } else if (is_tcf_tunnel_set(act)) { | |
3228 | entry->id = FLOW_ACTION_TUNNEL_ENCAP; | |
3229 | entry->tunnel = tcf_tunnel_info(act); | |
3230 | } else if (is_tcf_tunnel_release(act)) { | |
3231 | entry->id = FLOW_ACTION_TUNNEL_DECAP; | |
3a7b6861 PNA |
3232 | } else if (is_tcf_pedit(act)) { |
3233 | for (k = 0; k < tcf_pedit_nkeys(act); k++) { | |
3234 | switch (tcf_pedit_cmd(act, k)) { | |
3235 | case TCA_PEDIT_KEY_EX_CMD_SET: | |
3236 | entry->id = FLOW_ACTION_MANGLE; | |
3237 | break; | |
3238 | case TCA_PEDIT_KEY_EX_CMD_ADD: | |
3239 | entry->id = FLOW_ACTION_ADD; | |
3240 | break; | |
3241 | default: | |
3242 | goto err_out; | |
3243 | } | |
3244 | entry->mangle.htype = tcf_pedit_htype(act, k); | |
3245 | entry->mangle.mask = tcf_pedit_mask(act, k); | |
3246 | entry->mangle.val = tcf_pedit_val(act, k); | |
3247 | entry->mangle.offset = tcf_pedit_offset(act, k); | |
3248 | entry = &flow_action->entries[++j]; | |
3249 | } | |
3250 | } else if (is_tcf_csum(act)) { | |
3251 | entry->id = FLOW_ACTION_CSUM; | |
3252 | entry->csum_flags = tcf_csum_update_flags(act); | |
3253 | } else if (is_tcf_skbedit_mark(act)) { | |
3254 | entry->id = FLOW_ACTION_MARK; | |
3255 | entry->mark = tcf_skbedit_mark(act); | |
a7a7be60 PJV |
3256 | } else if (is_tcf_sample(act)) { |
3257 | entry->id = FLOW_ACTION_SAMPLE; | |
3258 | entry->sample.psample_group = | |
3259 | tcf_sample_psample_group(act); | |
3260 | entry->sample.trunc_size = tcf_sample_trunc_size(act); | |
3261 | entry->sample.truncate = tcf_sample_truncate(act); | |
3262 | entry->sample.rate = tcf_sample_rate(act); | |
8c8cfc6e PJV |
3263 | } else if (is_tcf_police(act)) { |
3264 | entry->id = FLOW_ACTION_POLICE; | |
3265 | entry->police.burst = tcf_police_tcfp_burst(act); | |
3266 | entry->police.rate_bytes_ps = | |
3267 | tcf_police_rate_bytes_ps(act); | |
b57dc7c1 PB |
3268 | } else if (is_tcf_ct(act)) { |
3269 | entry->id = FLOW_ACTION_CT; | |
3270 | entry->ct.action = tcf_ct_action(act); | |
3271 | entry->ct.zone = tcf_ct_zone(act); | |
3a7b6861 PNA |
3272 | } else { |
3273 | goto err_out; | |
3274 | } | |
3275 | ||
3276 | if (!is_tcf_pedit(act)) | |
3277 | j++; | |
3278 | } | |
3279 | return 0; | |
3280 | err_out: | |
3281 | return -EOPNOTSUPP; | |
3282 | } | |
3283 | EXPORT_SYMBOL(tc_setup_flow_action); | |
3284 | ||
e3ab786b PNA |
3285 | unsigned int tcf_exts_num_actions(struct tcf_exts *exts) |
3286 | { | |
3287 | unsigned int num_acts = 0; | |
3288 | struct tc_action *act; | |
3289 | int i; | |
3290 | ||
3291 | tcf_exts_for_each_action(i, act, exts) { | |
3292 | if (is_tcf_pedit(act)) | |
3293 | num_acts += tcf_pedit_nkeys(act); | |
3294 | else | |
3295 | num_acts++; | |
3296 | } | |
3297 | return num_acts; | |
3298 | } | |
3299 | EXPORT_SYMBOL(tcf_exts_num_actions); | |
3300 | ||
48617387 JP |
3301 | static __net_init int tcf_net_init(struct net *net) |
3302 | { | |
3303 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3304 | ||
ab281629 | 3305 | spin_lock_init(&tn->idr_lock); |
48617387 JP |
3306 | idr_init(&tn->idr); |
3307 | return 0; | |
3308 | } | |
3309 | ||
3310 | static void __net_exit tcf_net_exit(struct net *net) | |
3311 | { | |
3312 | struct tcf_net *tn = net_generic(net, tcf_net_id); | |
3313 | ||
3314 | idr_destroy(&tn->idr); | |
3315 | } | |
3316 | ||
3317 | static struct pernet_operations tcf_net_ops = { | |
3318 | .init = tcf_net_init, | |
3319 | .exit = tcf_net_exit, | |
3320 | .id = &tcf_net_id, | |
3321 | .size = sizeof(struct tcf_net), | |
3322 | }; | |
3323 | ||
1da177e4 LT |
3324 | static int __init tc_filter_init(void) |
3325 | { | |
48617387 JP |
3326 | int err; |
3327 | ||
7aa0045d CW |
3328 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
3329 | if (!tc_filter_wq) | |
3330 | return -ENOMEM; | |
3331 | ||
48617387 JP |
3332 | err = register_pernet_subsys(&tcf_net_ops); |
3333 | if (err) | |
3334 | goto err_register_pernet_subsys; | |
3335 | ||
7f76fa36 JH |
3336 | err = rhashtable_init(&indr_setup_block_ht, |
3337 | &tc_indr_setup_block_ht_params); | |
3338 | if (err) | |
3339 | goto err_rhash_setup_block_ht; | |
3340 | ||
470502de VB |
3341 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, |
3342 | RTNL_FLAG_DOIT_UNLOCKED); | |
3343 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, | |
3344 | RTNL_FLAG_DOIT_UNLOCKED); | |
c431f89b | 3345 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter, |
470502de | 3346 | tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED); |
32a4f5ec JP |
3347 | rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0); |
3348 | rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0); | |
3349 | rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain, | |
3350 | tc_dump_chain, 0); | |
1da177e4 | 3351 | |
1da177e4 | 3352 | return 0; |
48617387 | 3353 | |
7f76fa36 JH |
3354 | err_rhash_setup_block_ht: |
3355 | unregister_pernet_subsys(&tcf_net_ops); | |
48617387 JP |
3356 | err_register_pernet_subsys: |
3357 | destroy_workqueue(tc_filter_wq); | |
3358 | return err; | |
1da177e4 LT |
3359 | } |
3360 | ||
3361 | subsys_initcall(tc_filter_init); |