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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_api.c Packet classifier API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Changes: | |
12 | * | |
13 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
14 | * | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 | 20 | #include <linux/string.h> |
1da177e4 | 21 | #include <linux/errno.h> |
33a48927 | 22 | #include <linux/err.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/kmod.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
b854272b DL |
27 | #include <net/net_namespace.h> |
28 | #include <net/sock.h> | |
dc5fc579 | 29 | #include <net/netlink.h> |
1da177e4 LT |
30 | #include <net/pkt_sched.h> |
31 | #include <net/pkt_cls.h> | |
32 | ||
1da177e4 | 33 | /* The list of all installed classifier types */ |
36272874 | 34 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
35 | |
36 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
37 | static DEFINE_RWLOCK(cls_mod_lock); | |
38 | ||
39 | /* Find classifier type by string name */ | |
40 | ||
33a48927 | 41 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 42 | { |
dcd76081 | 43 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
44 | |
45 | if (kind) { | |
46 | read_lock(&cls_mod_lock); | |
36272874 | 47 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 48 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
49 | if (try_module_get(t->owner)) |
50 | res = t; | |
1da177e4 LT |
51 | break; |
52 | } | |
53 | } | |
54 | read_unlock(&cls_mod_lock); | |
55 | } | |
dcd76081 | 56 | return res; |
1da177e4 LT |
57 | } |
58 | ||
59 | /* Register(unregister) new classifier type */ | |
60 | ||
61 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
62 | { | |
36272874 | 63 | struct tcf_proto_ops *t; |
1da177e4 LT |
64 | int rc = -EEXIST; |
65 | ||
66 | write_lock(&cls_mod_lock); | |
36272874 | 67 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
68 | if (!strcmp(ops->kind, t->kind)) |
69 | goto out; | |
70 | ||
36272874 | 71 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
72 | rc = 0; |
73 | out: | |
74 | write_unlock(&cls_mod_lock); | |
75 | return rc; | |
76 | } | |
aa767bfe | 77 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 | 78 | |
7aa0045d CW |
79 | static struct workqueue_struct *tc_filter_wq; |
80 | ||
1da177e4 LT |
81 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
82 | { | |
36272874 | 83 | struct tcf_proto_ops *t; |
1da177e4 LT |
84 | int rc = -ENOENT; |
85 | ||
c78e1746 DB |
86 | /* Wait for outstanding call_rcu()s, if any, from a |
87 | * tcf_proto_ops's destroy() handler. | |
88 | */ | |
89 | rcu_barrier(); | |
7aa0045d | 90 | flush_workqueue(tc_filter_wq); |
c78e1746 | 91 | |
1da177e4 | 92 | write_lock(&cls_mod_lock); |
dcd76081 ED |
93 | list_for_each_entry(t, &tcf_proto_base, head) { |
94 | if (t == ops) { | |
95 | list_del(&t->head); | |
96 | rc = 0; | |
1da177e4 | 97 | break; |
dcd76081 ED |
98 | } |
99 | } | |
1da177e4 LT |
100 | write_unlock(&cls_mod_lock); |
101 | return rc; | |
102 | } | |
aa767bfe | 103 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 104 | |
7aa0045d CW |
105 | bool tcf_queue_work(struct work_struct *work) |
106 | { | |
107 | return queue_work(tc_filter_wq, work); | |
108 | } | |
109 | EXPORT_SYMBOL(tcf_queue_work); | |
110 | ||
1da177e4 LT |
111 | /* Select new prio value from the range, managed by kernel. */ |
112 | ||
aa767bfe | 113 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 114 | { |
aa767bfe | 115 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
116 | |
117 | if (tp) | |
cc7ec456 | 118 | first = tp->prio - 1; |
1da177e4 | 119 | |
7961973a | 120 | return TC_H_MAJ(first); |
1da177e4 LT |
121 | } |
122 | ||
33a48927 | 123 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
6529eaba | 124 | u32 prio, u32 parent, struct Qdisc *q, |
5bc17018 | 125 | struct tcf_chain *chain) |
33a48927 JP |
126 | { |
127 | struct tcf_proto *tp; | |
128 | int err; | |
129 | ||
130 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
131 | if (!tp) | |
132 | return ERR_PTR(-ENOBUFS); | |
133 | ||
134 | err = -ENOENT; | |
135 | tp->ops = tcf_proto_lookup_ops(kind); | |
136 | if (!tp->ops) { | |
137 | #ifdef CONFIG_MODULES | |
138 | rtnl_unlock(); | |
139 | request_module("cls_%s", kind); | |
140 | rtnl_lock(); | |
141 | tp->ops = tcf_proto_lookup_ops(kind); | |
142 | /* We dropped the RTNL semaphore in order to perform | |
143 | * the module load. So, even if we succeeded in loading | |
144 | * the module we have to replay the request. We indicate | |
145 | * this using -EAGAIN. | |
146 | */ | |
147 | if (tp->ops) { | |
148 | module_put(tp->ops->owner); | |
149 | err = -EAGAIN; | |
150 | } else { | |
151 | err = -ENOENT; | |
152 | } | |
33a48927 | 153 | #endif |
86634952 | 154 | goto errout; |
33a48927 JP |
155 | } |
156 | tp->classify = tp->ops->classify; | |
157 | tp->protocol = protocol; | |
158 | tp->prio = prio; | |
159 | tp->classid = parent; | |
160 | tp->q = q; | |
5bc17018 | 161 | tp->chain = chain; |
33a48927 JP |
162 | |
163 | err = tp->ops->init(tp); | |
164 | if (err) { | |
165 | module_put(tp->ops->owner); | |
166 | goto errout; | |
167 | } | |
168 | return tp; | |
169 | ||
170 | errout: | |
171 | kfree(tp); | |
172 | return ERR_PTR(err); | |
173 | } | |
174 | ||
763dbf63 | 175 | static void tcf_proto_destroy(struct tcf_proto *tp) |
cf1facda | 176 | { |
763dbf63 WC |
177 | tp->ops->destroy(tp); |
178 | module_put(tp->ops->owner); | |
179 | kfree_rcu(tp, rcu); | |
cf1facda JP |
180 | } |
181 | ||
5bc17018 JP |
182 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
183 | u32 chain_index) | |
2190d1d0 | 184 | { |
5bc17018 JP |
185 | struct tcf_chain *chain; |
186 | ||
187 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
188 | if (!chain) | |
189 | return NULL; | |
190 | list_add_tail(&chain->list, &block->chain_list); | |
191 | chain->block = block; | |
192 | chain->index = chain_index; | |
e2ef7544 | 193 | chain->refcnt = 1; |
5bc17018 | 194 | return chain; |
2190d1d0 JP |
195 | } |
196 | ||
c7eb7d72 JP |
197 | static void tcf_chain_head_change(struct tcf_chain *chain, |
198 | struct tcf_proto *tp_head) | |
199 | { | |
200 | if (chain->chain_head_change) | |
201 | chain->chain_head_change(tp_head, | |
202 | chain->chain_head_change_priv); | |
203 | } | |
204 | ||
f93e1cdc | 205 | static void tcf_chain_flush(struct tcf_chain *chain) |
cf1facda | 206 | { |
d7aa04a5 | 207 | struct tcf_proto *tp = rtnl_dereference(chain->filter_chain); |
cf1facda | 208 | |
c7eb7d72 | 209 | tcf_chain_head_change(chain, NULL); |
d7aa04a5 | 210 | while (tp) { |
2190d1d0 | 211 | RCU_INIT_POINTER(chain->filter_chain, tp->next); |
763dbf63 | 212 | tcf_proto_destroy(tp); |
d7aa04a5 RK |
213 | tp = rtnl_dereference(chain->filter_chain); |
214 | tcf_chain_put(chain); | |
cf1facda | 215 | } |
f93e1cdc JP |
216 | } |
217 | ||
218 | static void tcf_chain_destroy(struct tcf_chain *chain) | |
219 | { | |
314fab2e CW |
220 | struct tcf_block *block = chain->block; |
221 | ||
e2ef7544 CW |
222 | list_del(&chain->list); |
223 | kfree(chain); | |
314fab2e CW |
224 | if (list_empty(&block->chain_list)) |
225 | kfree(block); | |
e2ef7544 | 226 | } |
744a4cf6 | 227 | |
e2ef7544 CW |
228 | static void tcf_chain_hold(struct tcf_chain *chain) |
229 | { | |
230 | ++chain->refcnt; | |
2190d1d0 JP |
231 | } |
232 | ||
367a8ce8 WC |
233 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
234 | bool create) | |
5bc17018 JP |
235 | { |
236 | struct tcf_chain *chain; | |
237 | ||
238 | list_for_each_entry(chain, &block->chain_list, list) { | |
e2ef7544 CW |
239 | if (chain->index == chain_index) { |
240 | tcf_chain_hold(chain); | |
241 | return chain; | |
242 | } | |
5bc17018 | 243 | } |
80532384 | 244 | |
e2ef7544 | 245 | return create ? tcf_chain_create(block, chain_index) : NULL; |
5bc17018 JP |
246 | } |
247 | EXPORT_SYMBOL(tcf_chain_get); | |
248 | ||
249 | void tcf_chain_put(struct tcf_chain *chain) | |
250 | { | |
e2ef7544 | 251 | if (--chain->refcnt == 0) |
5bc17018 JP |
252 | tcf_chain_destroy(chain); |
253 | } | |
254 | EXPORT_SYMBOL(tcf_chain_put); | |
255 | ||
8c4083b3 JP |
256 | static void tcf_block_offload_cmd(struct tcf_block *block, struct Qdisc *q, |
257 | struct tcf_block_ext_info *ei, | |
258 | enum tc_block_command command) | |
259 | { | |
260 | struct net_device *dev = q->dev_queue->dev; | |
261 | struct tc_block_offload bo = {}; | |
262 | ||
44ae12a7 | 263 | if (!dev->netdev_ops->ndo_setup_tc) |
8c4083b3 JP |
264 | return; |
265 | bo.command = command; | |
266 | bo.binder_type = ei->binder_type; | |
267 | bo.block = block; | |
268 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); | |
269 | } | |
270 | ||
271 | static void tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q, | |
272 | struct tcf_block_ext_info *ei) | |
273 | { | |
274 | tcf_block_offload_cmd(block, q, ei, TC_BLOCK_BIND); | |
275 | } | |
276 | ||
277 | static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q, | |
278 | struct tcf_block_ext_info *ei) | |
279 | { | |
280 | tcf_block_offload_cmd(block, q, ei, TC_BLOCK_UNBIND); | |
281 | } | |
282 | ||
c7eb7d72 | 283 | int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, |
8c4083b3 | 284 | struct tcf_block_ext_info *ei) |
6529eaba JP |
285 | { |
286 | struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL); | |
5bc17018 | 287 | struct tcf_chain *chain; |
2190d1d0 | 288 | int err; |
6529eaba JP |
289 | |
290 | if (!block) | |
291 | return -ENOMEM; | |
5bc17018 | 292 | INIT_LIST_HEAD(&block->chain_list); |
acb67442 JP |
293 | INIT_LIST_HEAD(&block->cb_list); |
294 | ||
5bc17018 JP |
295 | /* Create chain 0 by default, it has to be always present. */ |
296 | chain = tcf_chain_create(block, 0); | |
297 | if (!chain) { | |
2190d1d0 JP |
298 | err = -ENOMEM; |
299 | goto err_chain_create; | |
300 | } | |
c7eb7d72 JP |
301 | WARN_ON(!ei->chain_head_change); |
302 | chain->chain_head_change = ei->chain_head_change; | |
303 | chain->chain_head_change_priv = ei->chain_head_change_priv; | |
855319be | 304 | block->net = qdisc_net(q); |
69d78ef2 | 305 | block->q = q; |
8c4083b3 | 306 | tcf_block_offload_bind(block, q, ei); |
6529eaba JP |
307 | *p_block = block; |
308 | return 0; | |
2190d1d0 JP |
309 | |
310 | err_chain_create: | |
311 | kfree(block); | |
312 | return err; | |
6529eaba | 313 | } |
8c4083b3 JP |
314 | EXPORT_SYMBOL(tcf_block_get_ext); |
315 | ||
c7eb7d72 JP |
316 | static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv) |
317 | { | |
318 | struct tcf_proto __rcu **p_filter_chain = priv; | |
319 | ||
320 | rcu_assign_pointer(*p_filter_chain, tp_head); | |
321 | } | |
322 | ||
8c4083b3 JP |
323 | int tcf_block_get(struct tcf_block **p_block, |
324 | struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q) | |
325 | { | |
c7eb7d72 JP |
326 | struct tcf_block_ext_info ei = { |
327 | .chain_head_change = tcf_chain_head_change_dflt, | |
328 | .chain_head_change_priv = p_filter_chain, | |
329 | }; | |
8c4083b3 | 330 | |
c7eb7d72 JP |
331 | WARN_ON(!p_filter_chain); |
332 | return tcf_block_get_ext(p_block, q, &ei); | |
8c4083b3 | 333 | } |
6529eaba JP |
334 | EXPORT_SYMBOL(tcf_block_get); |
335 | ||
7aa0045d | 336 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
a60b3f51 | 337 | * actions should be all removed after flushing. |
7aa0045d | 338 | */ |
c7eb7d72 | 339 | void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, |
e1ea2f98 | 340 | struct tcf_block_ext_info *ei) |
7aa0045d | 341 | { |
314fab2e | 342 | struct tcf_chain *chain, *tmp; |
1697c4bb | 343 | |
343723dd JP |
344 | if (!block) |
345 | return; | |
d4556ddf | 346 | /* Hold a refcnt for all chains, so that they don't disappear |
a60b3f51 RK |
347 | * while we are iterating. |
348 | */ | |
349 | list_for_each_entry(chain, &block->chain_list, list) | |
d4556ddf | 350 | tcf_chain_hold(chain); |
a60b3f51 RK |
351 | |
352 | list_for_each_entry(chain, &block->chain_list, list) | |
30d65e8f | 353 | tcf_chain_flush(chain); |
e2ef7544 | 354 | |
4bb1b116 JP |
355 | tcf_block_offload_unbind(block, q, ei); |
356 | ||
d4556ddf | 357 | /* At this point, all the chains should have refcnt >= 1. */ |
314fab2e CW |
358 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) |
359 | tcf_chain_put(chain); | |
d4556ddf JP |
360 | |
361 | /* Finally, put chain 0 and allow block to be freed. */ | |
362 | chain = list_first_entry(&block->chain_list, struct tcf_chain, list); | |
363 | tcf_chain_put(chain); | |
6529eaba | 364 | } |
8c4083b3 JP |
365 | EXPORT_SYMBOL(tcf_block_put_ext); |
366 | ||
367 | void tcf_block_put(struct tcf_block *block) | |
368 | { | |
369 | struct tcf_block_ext_info ei = {0, }; | |
370 | ||
4853f128 JP |
371 | if (!block) |
372 | return; | |
c7eb7d72 | 373 | tcf_block_put_ext(block, block->q, &ei); |
8c4083b3 | 374 | } |
e1ea2f98 | 375 | |
6529eaba | 376 | EXPORT_SYMBOL(tcf_block_put); |
cf1facda | 377 | |
acb67442 JP |
378 | struct tcf_block_cb { |
379 | struct list_head list; | |
380 | tc_setup_cb_t *cb; | |
381 | void *cb_ident; | |
382 | void *cb_priv; | |
383 | unsigned int refcnt; | |
384 | }; | |
385 | ||
386 | void *tcf_block_cb_priv(struct tcf_block_cb *block_cb) | |
387 | { | |
388 | return block_cb->cb_priv; | |
389 | } | |
390 | EXPORT_SYMBOL(tcf_block_cb_priv); | |
391 | ||
392 | struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block, | |
393 | tc_setup_cb_t *cb, void *cb_ident) | |
394 | { struct tcf_block_cb *block_cb; | |
395 | ||
396 | list_for_each_entry(block_cb, &block->cb_list, list) | |
397 | if (block_cb->cb == cb && block_cb->cb_ident == cb_ident) | |
398 | return block_cb; | |
399 | return NULL; | |
400 | } | |
401 | EXPORT_SYMBOL(tcf_block_cb_lookup); | |
402 | ||
403 | void tcf_block_cb_incref(struct tcf_block_cb *block_cb) | |
404 | { | |
405 | block_cb->refcnt++; | |
406 | } | |
407 | EXPORT_SYMBOL(tcf_block_cb_incref); | |
408 | ||
409 | unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb) | |
410 | { | |
411 | return --block_cb->refcnt; | |
412 | } | |
413 | EXPORT_SYMBOL(tcf_block_cb_decref); | |
414 | ||
415 | struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block, | |
416 | tc_setup_cb_t *cb, void *cb_ident, | |
417 | void *cb_priv) | |
418 | { | |
419 | struct tcf_block_cb *block_cb; | |
420 | ||
421 | block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); | |
422 | if (!block_cb) | |
423 | return NULL; | |
424 | block_cb->cb = cb; | |
425 | block_cb->cb_ident = cb_ident; | |
426 | block_cb->cb_priv = cb_priv; | |
427 | list_add(&block_cb->list, &block->cb_list); | |
428 | return block_cb; | |
429 | } | |
430 | EXPORT_SYMBOL(__tcf_block_cb_register); | |
431 | ||
432 | int tcf_block_cb_register(struct tcf_block *block, | |
433 | tc_setup_cb_t *cb, void *cb_ident, | |
434 | void *cb_priv) | |
435 | { | |
436 | struct tcf_block_cb *block_cb; | |
437 | ||
438 | block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv); | |
439 | return block_cb ? 0 : -ENOMEM; | |
440 | } | |
441 | EXPORT_SYMBOL(tcf_block_cb_register); | |
442 | ||
443 | void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb) | |
444 | { | |
445 | list_del(&block_cb->list); | |
446 | kfree(block_cb); | |
447 | } | |
448 | EXPORT_SYMBOL(__tcf_block_cb_unregister); | |
449 | ||
450 | void tcf_block_cb_unregister(struct tcf_block *block, | |
451 | tc_setup_cb_t *cb, void *cb_ident) | |
452 | { | |
453 | struct tcf_block_cb *block_cb; | |
454 | ||
455 | block_cb = tcf_block_cb_lookup(block, cb, cb_ident); | |
456 | if (!block_cb) | |
457 | return; | |
458 | __tcf_block_cb_unregister(block_cb); | |
459 | } | |
460 | EXPORT_SYMBOL(tcf_block_cb_unregister); | |
461 | ||
462 | static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type, | |
463 | void *type_data, bool err_stop) | |
464 | { | |
465 | struct tcf_block_cb *block_cb; | |
466 | int ok_count = 0; | |
467 | int err; | |
468 | ||
469 | list_for_each_entry(block_cb, &block->cb_list, list) { | |
470 | err = block_cb->cb(type, type_data, block_cb->cb_priv); | |
471 | if (err) { | |
472 | if (err_stop) | |
473 | return err; | |
474 | } else { | |
475 | ok_count++; | |
476 | } | |
477 | } | |
478 | return ok_count; | |
479 | } | |
480 | ||
87d83093 JP |
481 | /* Main classifier routine: scans classifier chain attached |
482 | * to this qdisc, (optionally) tests for protocol and asks | |
483 | * specific classifiers. | |
484 | */ | |
485 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
486 | struct tcf_result *res, bool compat_mode) | |
487 | { | |
488 | __be16 protocol = tc_skb_protocol(skb); | |
489 | #ifdef CONFIG_NET_CLS_ACT | |
490 | const int max_reclassify_loop = 4; | |
ee538dce JP |
491 | const struct tcf_proto *orig_tp = tp; |
492 | const struct tcf_proto *first_tp; | |
87d83093 JP |
493 | int limit = 0; |
494 | ||
495 | reclassify: | |
496 | #endif | |
497 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
498 | int err; | |
499 | ||
500 | if (tp->protocol != protocol && | |
501 | tp->protocol != htons(ETH_P_ALL)) | |
502 | continue; | |
503 | ||
504 | err = tp->classify(skb, tp, res); | |
505 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 506 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 507 | first_tp = orig_tp; |
87d83093 | 508 | goto reset; |
db50514f | 509 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 510 | first_tp = res->goto_tp; |
db50514f JP |
511 | goto reset; |
512 | } | |
87d83093 JP |
513 | #endif |
514 | if (err >= 0) | |
515 | return err; | |
516 | } | |
517 | ||
518 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
519 | #ifdef CONFIG_NET_CLS_ACT | |
520 | reset: | |
521 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
522 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", | |
523 | tp->q->ops->id, tp->prio & 0xffff, | |
524 | ntohs(tp->protocol)); | |
525 | return TC_ACT_SHOT; | |
526 | } | |
527 | ||
ee538dce | 528 | tp = first_tp; |
87d83093 JP |
529 | protocol = tc_skb_protocol(skb); |
530 | goto reclassify; | |
531 | #endif | |
532 | } | |
533 | EXPORT_SYMBOL(tcf_classify); | |
534 | ||
2190d1d0 JP |
535 | struct tcf_chain_info { |
536 | struct tcf_proto __rcu **pprev; | |
537 | struct tcf_proto __rcu *next; | |
538 | }; | |
539 | ||
540 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
541 | { | |
542 | return rtnl_dereference(*chain_info->pprev); | |
543 | } | |
544 | ||
545 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
546 | struct tcf_chain_info *chain_info, | |
547 | struct tcf_proto *tp) | |
548 | { | |
c7eb7d72 JP |
549 | if (*chain_info->pprev == chain->filter_chain) |
550 | tcf_chain_head_change(chain, tp); | |
2190d1d0 JP |
551 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
552 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 553 | tcf_chain_hold(chain); |
2190d1d0 JP |
554 | } |
555 | ||
556 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
557 | struct tcf_chain_info *chain_info, | |
558 | struct tcf_proto *tp) | |
559 | { | |
560 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
561 | ||
c7eb7d72 JP |
562 | if (tp == chain->filter_chain) |
563 | tcf_chain_head_change(chain, next); | |
2190d1d0 | 564 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 565 | tcf_chain_put(chain); |
2190d1d0 JP |
566 | } |
567 | ||
568 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
569 | struct tcf_chain_info *chain_info, | |
570 | u32 protocol, u32 prio, | |
571 | bool prio_allocate) | |
572 | { | |
573 | struct tcf_proto **pprev; | |
574 | struct tcf_proto *tp; | |
575 | ||
576 | /* Check the chain for existence of proto-tcf with this priority */ | |
577 | for (pprev = &chain->filter_chain; | |
578 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
579 | if (tp->prio >= prio) { | |
580 | if (tp->prio == prio) { | |
581 | if (prio_allocate || | |
582 | (tp->protocol != protocol && protocol)) | |
583 | return ERR_PTR(-EINVAL); | |
584 | } else { | |
585 | tp = NULL; | |
586 | } | |
587 | break; | |
588 | } | |
589 | } | |
590 | chain_info->pprev = pprev; | |
591 | chain_info->next = tp ? tp->next : NULL; | |
592 | return tp; | |
593 | } | |
594 | ||
7120371c | 595 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
a10fa201 JP |
596 | struct tcf_proto *tp, struct Qdisc *q, u32 parent, |
597 | void *fh, u32 portid, u32 seq, u16 flags, int event) | |
7120371c WC |
598 | { |
599 | struct tcmsg *tcm; | |
600 | struct nlmsghdr *nlh; | |
601 | unsigned char *b = skb_tail_pointer(skb); | |
602 | ||
603 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
604 | if (!nlh) | |
605 | goto out_nlmsg_trim; | |
606 | tcm = nlmsg_data(nlh); | |
607 | tcm->tcm_family = AF_UNSPEC; | |
608 | tcm->tcm__pad1 = 0; | |
609 | tcm->tcm__pad2 = 0; | |
a10fa201 JP |
610 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
611 | tcm->tcm_parent = parent; | |
7120371c WC |
612 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); |
613 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
614 | goto nla_put_failure; | |
615 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
616 | goto nla_put_failure; | |
617 | if (!fh) { | |
618 | tcm->tcm_handle = 0; | |
619 | } else { | |
620 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
621 | goto nla_put_failure; | |
622 | } | |
623 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
624 | return skb->len; | |
625 | ||
626 | out_nlmsg_trim: | |
627 | nla_put_failure: | |
628 | nlmsg_trim(skb, b); | |
629 | return -1; | |
630 | } | |
631 | ||
632 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
633 | struct nlmsghdr *n, struct tcf_proto *tp, | |
a10fa201 | 634 | struct Qdisc *q, u32 parent, |
7120371c WC |
635 | void *fh, int event, bool unicast) |
636 | { | |
637 | struct sk_buff *skb; | |
638 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
639 | ||
640 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
641 | if (!skb) | |
642 | return -ENOBUFS; | |
643 | ||
a10fa201 | 644 | if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq, |
7120371c WC |
645 | n->nlmsg_flags, event) <= 0) { |
646 | kfree_skb(skb); | |
647 | return -EINVAL; | |
648 | } | |
649 | ||
650 | if (unicast) | |
651 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
652 | ||
653 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
654 | n->nlmsg_flags & NLM_F_ECHO); | |
655 | } | |
656 | ||
657 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
658 | struct nlmsghdr *n, struct tcf_proto *tp, | |
a10fa201 | 659 | struct Qdisc *q, u32 parent, |
7120371c WC |
660 | void *fh, bool unicast, bool *last) |
661 | { | |
662 | struct sk_buff *skb; | |
663 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
664 | int err; | |
665 | ||
666 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
667 | if (!skb) | |
668 | return -ENOBUFS; | |
669 | ||
a10fa201 | 670 | if (tcf_fill_node(net, skb, tp, q, parent, fh, portid, n->nlmsg_seq, |
7120371c WC |
671 | n->nlmsg_flags, RTM_DELTFILTER) <= 0) { |
672 | kfree_skb(skb); | |
673 | return -EINVAL; | |
674 | } | |
675 | ||
676 | err = tp->ops->delete(tp, fh, last); | |
677 | if (err) { | |
678 | kfree_skb(skb); | |
679 | return err; | |
680 | } | |
681 | ||
682 | if (unicast) | |
683 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
684 | ||
685 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
686 | n->nlmsg_flags & NLM_F_ECHO); | |
687 | } | |
688 | ||
689 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
a10fa201 | 690 | struct Qdisc *q, u32 parent, |
7120371c WC |
691 | struct nlmsghdr *n, |
692 | struct tcf_chain *chain, int event) | |
693 | { | |
694 | struct tcf_proto *tp; | |
695 | ||
696 | for (tp = rtnl_dereference(chain->filter_chain); | |
697 | tp; tp = rtnl_dereference(tp->next)) | |
a10fa201 | 698 | tfilter_notify(net, oskb, n, tp, q, parent, 0, event, false); |
7120371c WC |
699 | } |
700 | ||
1da177e4 LT |
701 | /* Add/change/delete/get a filter node */ |
702 | ||
c21ef3e3 DA |
703 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
704 | struct netlink_ext_ack *extack) | |
1da177e4 | 705 | { |
3b1e0a65 | 706 | struct net *net = sock_net(skb->sk); |
add93b61 | 707 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
708 | struct tcmsg *t; |
709 | u32 protocol; | |
710 | u32 prio; | |
9d36d9e5 | 711 | bool prio_allocate; |
1da177e4 | 712 | u32 parent; |
5bc17018 | 713 | u32 chain_index; |
1da177e4 LT |
714 | struct net_device *dev; |
715 | struct Qdisc *q; | |
2190d1d0 | 716 | struct tcf_chain_info chain_info; |
5bc17018 | 717 | struct tcf_chain *chain = NULL; |
6529eaba | 718 | struct tcf_block *block; |
1da177e4 | 719 | struct tcf_proto *tp; |
20fea08b | 720 | const struct Qdisc_class_ops *cops; |
1da177e4 | 721 | unsigned long cl; |
8113c095 | 722 | void *fh; |
1da177e4 | 723 | int err; |
628185cf | 724 | int tp_created; |
1da177e4 | 725 | |
4e8bbb81 | 726 | if ((n->nlmsg_type != RTM_GETTFILTER) && |
5f013c9b | 727 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 728 | return -EPERM; |
de179c8c | 729 | |
1da177e4 | 730 | replay: |
628185cf DB |
731 | tp_created = 0; |
732 | ||
c21ef3e3 | 733 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
734 | if (err < 0) |
735 | return err; | |
736 | ||
942b8165 | 737 | t = nlmsg_data(n); |
1da177e4 LT |
738 | protocol = TC_H_MIN(t->tcm_info); |
739 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 740 | prio_allocate = false; |
1da177e4 LT |
741 | parent = t->tcm_parent; |
742 | cl = 0; | |
743 | ||
744 | if (prio == 0) { | |
ea7f8277 DB |
745 | switch (n->nlmsg_type) { |
746 | case RTM_DELTFILTER: | |
9f6ed032 | 747 | if (protocol || t->tcm_handle || tca[TCA_KIND]) |
ea7f8277 DB |
748 | return -ENOENT; |
749 | break; | |
750 | case RTM_NEWTFILTER: | |
751 | /* If no priority is provided by the user, | |
752 | * we allocate one. | |
753 | */ | |
754 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
755 | prio = TC_H_MAKE(0x80000000U, 0U); | |
9d36d9e5 | 756 | prio_allocate = true; |
ea7f8277 DB |
757 | break; |
758 | } | |
759 | /* fall-through */ | |
760 | default: | |
1da177e4 | 761 | return -ENOENT; |
ea7f8277 | 762 | } |
1da177e4 LT |
763 | } |
764 | ||
765 | /* Find head of filter chain. */ | |
766 | ||
767 | /* Find link */ | |
7316ae88 | 768 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 769 | if (dev == NULL) |
1da177e4 LT |
770 | return -ENODEV; |
771 | ||
772 | /* Find qdisc */ | |
773 | if (!parent) { | |
af356afa | 774 | q = dev->qdisc; |
1da177e4 | 775 | parent = q->handle; |
aa767bfe SH |
776 | } else { |
777 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
778 | if (q == NULL) | |
779 | return -EINVAL; | |
780 | } | |
1da177e4 LT |
781 | |
782 | /* Is it classful? */ | |
cc7ec456 ED |
783 | cops = q->ops->cl_ops; |
784 | if (!cops) | |
1da177e4 LT |
785 | return -EINVAL; |
786 | ||
6529eaba | 787 | if (!cops->tcf_block) |
71ebe5e9 PM |
788 | return -EOPNOTSUPP; |
789 | ||
1da177e4 LT |
790 | /* Do we search for filter, attached to class? */ |
791 | if (TC_H_MIN(parent)) { | |
143976ce | 792 | cl = cops->find(q, parent); |
1da177e4 LT |
793 | if (cl == 0) |
794 | return -ENOENT; | |
795 | } | |
796 | ||
797 | /* And the last stroke */ | |
6529eaba JP |
798 | block = cops->tcf_block(q, cl); |
799 | if (!block) { | |
6bb16e7a | 800 | err = -EINVAL; |
1da177e4 | 801 | goto errout; |
6bb16e7a | 802 | } |
5bc17018 JP |
803 | |
804 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
805 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
806 | err = -EINVAL; | |
807 | goto errout; | |
808 | } | |
367a8ce8 WC |
809 | chain = tcf_chain_get(block, chain_index, |
810 | n->nlmsg_type == RTM_NEWTFILTER); | |
5bc17018 | 811 | if (!chain) { |
367a8ce8 | 812 | err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL; |
5bc17018 JP |
813 | goto errout; |
814 | } | |
6529eaba | 815 | |
ea7f8277 | 816 | if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) { |
a10fa201 JP |
817 | tfilter_notify_chain(net, skb, q, parent, n, |
818 | chain, RTM_DELTFILTER); | |
f93e1cdc | 819 | tcf_chain_flush(chain); |
ea7f8277 DB |
820 | err = 0; |
821 | goto errout; | |
822 | } | |
1da177e4 | 823 | |
2190d1d0 JP |
824 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
825 | prio, prio_allocate); | |
826 | if (IS_ERR(tp)) { | |
827 | err = PTR_ERR(tp); | |
828 | goto errout; | |
1da177e4 LT |
829 | } |
830 | ||
831 | if (tp == NULL) { | |
832 | /* Proto-tcf does not exist, create new one */ | |
833 | ||
6bb16e7a JP |
834 | if (tca[TCA_KIND] == NULL || !protocol) { |
835 | err = -EINVAL; | |
1da177e4 | 836 | goto errout; |
6bb16e7a | 837 | } |
1da177e4 | 838 | |
cc7ec456 | 839 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
840 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
841 | err = -ENOENT; | |
1da177e4 | 842 | goto errout; |
6bb16e7a | 843 | } |
1da177e4 | 844 | |
9d36d9e5 | 845 | if (prio_allocate) |
2190d1d0 | 846 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 847 | |
33a48927 | 848 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
5bc17018 | 849 | protocol, prio, parent, q, chain); |
33a48927 JP |
850 | if (IS_ERR(tp)) { |
851 | err = PTR_ERR(tp); | |
1da177e4 LT |
852 | goto errout; |
853 | } | |
12186be7 | 854 | tp_created = 1; |
6bb16e7a JP |
855 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
856 | err = -EINVAL; | |
1da177e4 | 857 | goto errout; |
6bb16e7a | 858 | } |
1da177e4 LT |
859 | |
860 | fh = tp->ops->get(tp, t->tcm_handle); | |
861 | ||
8113c095 | 862 | if (!fh) { |
1da177e4 | 863 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { |
2190d1d0 | 864 | tcf_chain_tp_remove(chain, &chain_info, tp); |
a10fa201 | 865 | tfilter_notify(net, skb, n, tp, q, parent, fh, |
fa59b27c | 866 | RTM_DELTFILTER, false); |
763dbf63 | 867 | tcf_proto_destroy(tp); |
1da177e4 LT |
868 | err = 0; |
869 | goto errout; | |
870 | } | |
871 | ||
aa767bfe | 872 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
873 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
874 | err = -ENOENT; | |
1da177e4 | 875 | goto errout; |
6bb16e7a | 876 | } |
1da177e4 | 877 | } else { |
763dbf63 WC |
878 | bool last; |
879 | ||
1da177e4 | 880 | switch (n->nlmsg_type) { |
10297b99 | 881 | case RTM_NEWTFILTER: |
12186be7 MU |
882 | if (n->nlmsg_flags & NLM_F_EXCL) { |
883 | if (tp_created) | |
763dbf63 | 884 | tcf_proto_destroy(tp); |
6bb16e7a | 885 | err = -EEXIST; |
1da177e4 | 886 | goto errout; |
12186be7 | 887 | } |
1da177e4 LT |
888 | break; |
889 | case RTM_DELTFILTER: | |
a10fa201 JP |
890 | err = tfilter_del_notify(net, skb, n, tp, q, parent, |
891 | fh, false, &last); | |
40c81b25 JP |
892 | if (err) |
893 | goto errout; | |
763dbf63 | 894 | if (last) { |
2190d1d0 | 895 | tcf_chain_tp_remove(chain, &chain_info, tp); |
763dbf63 WC |
896 | tcf_proto_destroy(tp); |
897 | } | |
d7cf52c2 | 898 | goto errout; |
1da177e4 | 899 | case RTM_GETTFILTER: |
a10fa201 | 900 | err = tfilter_notify(net, skb, n, tp, q, parent, fh, |
fa59b27c | 901 | RTM_NEWTFILTER, true); |
1da177e4 LT |
902 | goto errout; |
903 | default: | |
904 | err = -EINVAL; | |
905 | goto errout; | |
906 | } | |
907 | } | |
908 | ||
2f7ef2f8 CW |
909 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
910 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); | |
12186be7 | 911 | if (err == 0) { |
2190d1d0 JP |
912 | if (tp_created) |
913 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
a10fa201 JP |
914 | tfilter_notify(net, skb, n, tp, q, parent, fh, |
915 | RTM_NEWTFILTER, false); | |
12186be7 MU |
916 | } else { |
917 | if (tp_created) | |
763dbf63 | 918 | tcf_proto_destroy(tp); |
12186be7 | 919 | } |
1da177e4 LT |
920 | |
921 | errout: | |
5bc17018 JP |
922 | if (chain) |
923 | tcf_chain_put(chain); | |
1da177e4 LT |
924 | if (err == -EAGAIN) |
925 | /* Replay the request. */ | |
926 | goto replay; | |
927 | return err; | |
928 | } | |
929 | ||
aa767bfe | 930 | struct tcf_dump_args { |
1da177e4 LT |
931 | struct tcf_walker w; |
932 | struct sk_buff *skb; | |
933 | struct netlink_callback *cb; | |
a10fa201 JP |
934 | struct Qdisc *q; |
935 | u32 parent; | |
1da177e4 LT |
936 | }; |
937 | ||
8113c095 | 938 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 939 | { |
aa767bfe | 940 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 941 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 942 | |
a10fa201 JP |
943 | return tcf_fill_node(net, a->skb, tp, a->q, a->parent, |
944 | n, NETLINK_CB(a->cb->skb).portid, | |
5a7a5555 JHS |
945 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
946 | RTM_NEWTFILTER); | |
1da177e4 LT |
947 | } |
948 | ||
a10fa201 JP |
949 | static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent, |
950 | struct sk_buff *skb, struct netlink_callback *cb, | |
acb31fae JP |
951 | long index_start, long *p_index) |
952 | { | |
953 | struct net *net = sock_net(skb->sk); | |
954 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
955 | struct tcf_dump_args arg; | |
956 | struct tcf_proto *tp; | |
957 | ||
958 | for (tp = rtnl_dereference(chain->filter_chain); | |
959 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
960 | if (*p_index < index_start) | |
961 | continue; | |
962 | if (TC_H_MAJ(tcm->tcm_info) && | |
963 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
964 | continue; | |
965 | if (TC_H_MIN(tcm->tcm_info) && | |
966 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
967 | continue; | |
968 | if (*p_index > index_start) | |
969 | memset(&cb->args[1], 0, | |
970 | sizeof(cb->args) - sizeof(cb->args[0])); | |
971 | if (cb->args[1] == 0) { | |
a10fa201 | 972 | if (tcf_fill_node(net, skb, tp, q, parent, 0, |
acb31fae JP |
973 | NETLINK_CB(cb->skb).portid, |
974 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
975 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 976 | return false; |
acb31fae JP |
977 | |
978 | cb->args[1] = 1; | |
979 | } | |
980 | if (!tp->ops->walk) | |
981 | continue; | |
982 | arg.w.fn = tcf_node_dump; | |
983 | arg.skb = skb; | |
984 | arg.cb = cb; | |
a10fa201 JP |
985 | arg.q = q; |
986 | arg.parent = parent; | |
acb31fae JP |
987 | arg.w.stop = 0; |
988 | arg.w.skip = cb->args[1] - 1; | |
989 | arg.w.count = 0; | |
990 | tp->ops->walk(tp, &arg.w); | |
991 | cb->args[1] = arg.w.count + 1; | |
992 | if (arg.w.stop) | |
5bc17018 | 993 | return false; |
acb31fae | 994 | } |
5bc17018 | 995 | return true; |
acb31fae JP |
996 | } |
997 | ||
bd27a875 | 998 | /* called with RTNL */ |
1da177e4 LT |
999 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
1000 | { | |
3b1e0a65 | 1001 | struct net *net = sock_net(skb->sk); |
5bc17018 | 1002 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1003 | struct net_device *dev; |
1004 | struct Qdisc *q; | |
6529eaba | 1005 | struct tcf_block *block; |
2190d1d0 | 1006 | struct tcf_chain *chain; |
942b8165 | 1007 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 1008 | unsigned long cl = 0; |
20fea08b | 1009 | const struct Qdisc_class_ops *cops; |
acb31fae JP |
1010 | long index_start; |
1011 | long index; | |
a10fa201 | 1012 | u32 parent; |
5bc17018 | 1013 | int err; |
1da177e4 | 1014 | |
573ce260 | 1015 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1016 | return skb->len; |
5bc17018 JP |
1017 | |
1018 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
1019 | if (err) | |
1020 | return err; | |
1021 | ||
cc7ec456 ED |
1022 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1023 | if (!dev) | |
1da177e4 LT |
1024 | return skb->len; |
1025 | ||
a10fa201 JP |
1026 | parent = tcm->tcm_parent; |
1027 | if (!parent) { | |
af356afa | 1028 | q = dev->qdisc; |
a10fa201 JP |
1029 | parent = q->handle; |
1030 | } else { | |
1da177e4 | 1031 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); |
a10fa201 | 1032 | } |
1da177e4 LT |
1033 | if (!q) |
1034 | goto out; | |
cc7ec456 ED |
1035 | cops = q->ops->cl_ops; |
1036 | if (!cops) | |
143976ce | 1037 | goto out; |
6529eaba | 1038 | if (!cops->tcf_block) |
143976ce | 1039 | goto out; |
1da177e4 | 1040 | if (TC_H_MIN(tcm->tcm_parent)) { |
143976ce | 1041 | cl = cops->find(q, tcm->tcm_parent); |
1da177e4 | 1042 | if (cl == 0) |
143976ce | 1043 | goto out; |
1da177e4 | 1044 | } |
6529eaba JP |
1045 | block = cops->tcf_block(q, cl); |
1046 | if (!block) | |
143976ce | 1047 | goto out; |
1da177e4 | 1048 | |
acb31fae JP |
1049 | index_start = cb->args[0]; |
1050 | index = 0; | |
5bc17018 JP |
1051 | |
1052 | list_for_each_entry(chain, &block->chain_list, list) { | |
1053 | if (tca[TCA_CHAIN] && | |
1054 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
1055 | continue; | |
a10fa201 | 1056 | if (!tcf_chain_dump(chain, q, parent, skb, cb, |
4c7dcb53 RK |
1057 | index_start, &index)) { |
1058 | err = -EMSGSIZE; | |
5bc17018 | 1059 | break; |
4c7dcb53 | 1060 | } |
5bc17018 JP |
1061 | } |
1062 | ||
acb31fae | 1063 | cb->args[0] = index; |
1da177e4 | 1064 | |
1da177e4 | 1065 | out: |
4c7dcb53 RK |
1066 | /* If we did no progress, the error (EMSGSIZE) is real */ |
1067 | if (skb->len == 0 && err) | |
1068 | return err; | |
1da177e4 LT |
1069 | return skb->len; |
1070 | } | |
1071 | ||
18d0264f | 1072 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
1073 | { |
1074 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
1075 | LIST_HEAD(actions); |
1076 | ||
2d132eba | 1077 | ASSERT_RTNL(); |
22dc13c8 WC |
1078 | tcf_exts_to_list(exts, &actions); |
1079 | tcf_action_destroy(&actions, TCA_ACT_UNBIND); | |
1080 | kfree(exts->actions); | |
1081 | exts->nr_actions = 0; | |
1da177e4 LT |
1082 | #endif |
1083 | } | |
aa767bfe | 1084 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 1085 | |
c1b52739 | 1086 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
5a7a5555 | 1087 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) |
1da177e4 | 1088 | { |
1da177e4 LT |
1089 | #ifdef CONFIG_NET_CLS_ACT |
1090 | { | |
1da177e4 LT |
1091 | struct tc_action *act; |
1092 | ||
5da57f42 | 1093 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
1094 | act = tcf_action_init_1(net, tp, tb[exts->police], |
1095 | rate_tlv, "police", ovr, | |
1096 | TCA_ACT_BIND); | |
ab27cfb8 PM |
1097 | if (IS_ERR(act)) |
1098 | return PTR_ERR(act); | |
1da177e4 | 1099 | |
33be6271 | 1100 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
1101 | exts->actions[0] = act; |
1102 | exts->nr_actions = 1; | |
5da57f42 | 1103 | } else if (exts->action && tb[exts->action]) { |
22dc13c8 WC |
1104 | LIST_HEAD(actions); |
1105 | int err, i = 0; | |
1106 | ||
9fb9f251 JP |
1107 | err = tcf_action_init(net, tp, tb[exts->action], |
1108 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
5a7a5555 | 1109 | &actions); |
33be6271 WC |
1110 | if (err) |
1111 | return err; | |
22dc13c8 WC |
1112 | list_for_each_entry(act, &actions, list) |
1113 | exts->actions[i++] = act; | |
1114 | exts->nr_actions = i; | |
1da177e4 | 1115 | } |
e4b95c41 | 1116 | exts->net = net; |
1da177e4 | 1117 | } |
1da177e4 | 1118 | #else |
5da57f42 WC |
1119 | if ((exts->action && tb[exts->action]) || |
1120 | (exts->police && tb[exts->police])) | |
1da177e4 LT |
1121 | return -EOPNOTSUPP; |
1122 | #endif | |
1123 | ||
1124 | return 0; | |
1125 | } | |
aa767bfe | 1126 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 1127 | |
9b0d4446 | 1128 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
1129 | { |
1130 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
1131 | struct tcf_exts old = *dst; |
1132 | ||
9b0d4446 | 1133 | *dst = *src; |
22dc13c8 | 1134 | tcf_exts_destroy(&old); |
1da177e4 LT |
1135 | #endif |
1136 | } | |
aa767bfe | 1137 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 1138 | |
22dc13c8 WC |
1139 | #ifdef CONFIG_NET_CLS_ACT |
1140 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
1141 | { | |
1142 | if (exts->nr_actions == 0) | |
1143 | return NULL; | |
1144 | else | |
1145 | return exts->actions[0]; | |
1146 | } | |
1147 | #endif | |
33be6271 | 1148 | |
5da57f42 | 1149 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1150 | { |
1151 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
1152 | struct nlattr *nest; |
1153 | ||
978dfd8d | 1154 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
1155 | /* |
1156 | * again for backward compatible mode - we want | |
1157 | * to work with both old and new modes of entering | |
1158 | * tc data even if iproute2 was newer - jhs | |
1159 | */ | |
33be6271 | 1160 | if (exts->type != TCA_OLD_COMPAT) { |
22dc13c8 WC |
1161 | LIST_HEAD(actions); |
1162 | ||
5da57f42 | 1163 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
1164 | if (nest == NULL) |
1165 | goto nla_put_failure; | |
22dc13c8 WC |
1166 | |
1167 | tcf_exts_to_list(exts, &actions); | |
1168 | if (tcf_action_dump(skb, &actions, 0, 0) < 0) | |
add93b61 | 1169 | goto nla_put_failure; |
4b3550ef | 1170 | nla_nest_end(skb, nest); |
5da57f42 | 1171 | } else if (exts->police) { |
33be6271 | 1172 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 1173 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 1174 | if (nest == NULL || !act) |
4b3550ef | 1175 | goto nla_put_failure; |
33be6271 | 1176 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 1177 | goto nla_put_failure; |
4b3550ef | 1178 | nla_nest_end(skb, nest); |
1da177e4 LT |
1179 | } |
1180 | } | |
1da177e4 | 1181 | return 0; |
9cc63db5 CW |
1182 | |
1183 | nla_put_failure: | |
1184 | nla_nest_cancel(skb, nest); | |
1da177e4 | 1185 | return -1; |
9cc63db5 CW |
1186 | #else |
1187 | return 0; | |
1188 | #endif | |
1da177e4 | 1189 | } |
aa767bfe | 1190 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 1191 | |
aa767bfe | 1192 | |
5da57f42 | 1193 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1194 | { |
1195 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 1196 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 1197 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 1198 | return -1; |
1da177e4 LT |
1199 | #endif |
1200 | return 0; | |
1da177e4 | 1201 | } |
aa767bfe | 1202 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 1203 | |
717503b9 JP |
1204 | static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts, |
1205 | enum tc_setup_type type, | |
1206 | void *type_data, bool err_stop) | |
b3f55bdd JP |
1207 | { |
1208 | int ok_count = 0; | |
1209 | #ifdef CONFIG_NET_CLS_ACT | |
1210 | const struct tc_action *a; | |
1211 | struct net_device *dev; | |
9d452ceb | 1212 | int i, ret; |
b3f55bdd JP |
1213 | |
1214 | if (!tcf_exts_has_actions(exts)) | |
1215 | return 0; | |
1216 | ||
9d452ceb OG |
1217 | for (i = 0; i < exts->nr_actions; i++) { |
1218 | a = exts->actions[i]; | |
b3f55bdd JP |
1219 | if (!a->ops->get_dev) |
1220 | continue; | |
1221 | dev = a->ops->get_dev(a); | |
7612fb03 | 1222 | if (!dev) |
b3f55bdd JP |
1223 | continue; |
1224 | ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop); | |
1225 | if (ret < 0) | |
1226 | return ret; | |
1227 | ok_count += ret; | |
1228 | } | |
1229 | #endif | |
1230 | return ok_count; | |
1231 | } | |
717503b9 | 1232 | |
208c0f4b JP |
1233 | int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts, |
1234 | enum tc_setup_type type, void *type_data, bool err_stop) | |
717503b9 | 1235 | { |
208c0f4b JP |
1236 | int ok_count; |
1237 | int ret; | |
1238 | ||
1239 | ret = tcf_block_cb_call(block, type, type_data, err_stop); | |
1240 | if (ret < 0) | |
1241 | return ret; | |
1242 | ok_count = ret; | |
1243 | ||
4ac3191c | 1244 | if (!exts || ok_count) |
208c0f4b JP |
1245 | return ok_count; |
1246 | ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop); | |
1247 | if (ret < 0) | |
1248 | return ret; | |
1249 | ok_count += ret; | |
1250 | ||
1251 | return ok_count; | |
717503b9 JP |
1252 | } |
1253 | EXPORT_SYMBOL(tc_setup_cb_call); | |
b3f55bdd | 1254 | |
1da177e4 LT |
1255 | static int __init tc_filter_init(void) |
1256 | { | |
7aa0045d CW |
1257 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
1258 | if (!tc_filter_wq) | |
1259 | return -ENOMEM; | |
1260 | ||
b97bac64 FW |
1261 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0); |
1262 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0); | |
82623c0d | 1263 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
b97bac64 | 1264 | tc_dump_tfilter, 0); |
1da177e4 | 1265 | |
1da177e4 LT |
1266 | return 0; |
1267 | } | |
1268 | ||
1269 | subsys_initcall(tc_filter_init); |