]>
Commit | Line | Data |
---|---|---|
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> | |
ab27cfb8 | 26 | #include <linux/err.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
b854272b DL |
28 | #include <net/net_namespace.h> |
29 | #include <net/sock.h> | |
dc5fc579 | 30 | #include <net/netlink.h> |
1da177e4 LT |
31 | #include <net/pkt_sched.h> |
32 | #include <net/pkt_cls.h> | |
33 | ||
1da177e4 | 34 | /* The list of all installed classifier types */ |
36272874 | 35 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
36 | |
37 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
38 | static DEFINE_RWLOCK(cls_mod_lock); | |
39 | ||
40 | /* Find classifier type by string name */ | |
41 | ||
33a48927 | 42 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind) |
1da177e4 | 43 | { |
dcd76081 | 44 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
45 | |
46 | if (kind) { | |
47 | read_lock(&cls_mod_lock); | |
36272874 | 48 | list_for_each_entry(t, &tcf_proto_base, head) { |
33a48927 | 49 | if (strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
50 | if (try_module_get(t->owner)) |
51 | res = t; | |
1da177e4 LT |
52 | break; |
53 | } | |
54 | } | |
55 | read_unlock(&cls_mod_lock); | |
56 | } | |
dcd76081 | 57 | return res; |
1da177e4 LT |
58 | } |
59 | ||
60 | /* Register(unregister) new classifier type */ | |
61 | ||
62 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
63 | { | |
36272874 | 64 | struct tcf_proto_ops *t; |
1da177e4 LT |
65 | int rc = -EEXIST; |
66 | ||
67 | write_lock(&cls_mod_lock); | |
36272874 | 68 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
69 | if (!strcmp(ops->kind, t->kind)) |
70 | goto out; | |
71 | ||
36272874 | 72 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
73 | rc = 0; |
74 | out: | |
75 | write_unlock(&cls_mod_lock); | |
76 | return rc; | |
77 | } | |
aa767bfe | 78 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 LT |
79 | |
80 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) | |
81 | { | |
36272874 | 82 | struct tcf_proto_ops *t; |
1da177e4 LT |
83 | int rc = -ENOENT; |
84 | ||
c78e1746 DB |
85 | /* Wait for outstanding call_rcu()s, if any, from a |
86 | * tcf_proto_ops's destroy() handler. | |
87 | */ | |
88 | rcu_barrier(); | |
89 | ||
1da177e4 | 90 | write_lock(&cls_mod_lock); |
dcd76081 ED |
91 | list_for_each_entry(t, &tcf_proto_base, head) { |
92 | if (t == ops) { | |
93 | list_del(&t->head); | |
94 | rc = 0; | |
1da177e4 | 95 | break; |
dcd76081 ED |
96 | } |
97 | } | |
1da177e4 LT |
98 | write_unlock(&cls_mod_lock); |
99 | return rc; | |
100 | } | |
aa767bfe | 101 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 102 | |
7316ae88 TG |
103 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
104 | struct nlmsghdr *n, struct tcf_proto *tp, | |
fa59b27c | 105 | unsigned long fh, int event, bool unicast); |
1da177e4 | 106 | |
54df2cf8 WC |
107 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, |
108 | struct nlmsghdr *n, struct tcf_proto *tp, | |
109 | unsigned long fh, bool unicast, bool *last); | |
110 | ||
ea7f8277 DB |
111 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, |
112 | struct nlmsghdr *n, | |
2190d1d0 | 113 | struct tcf_chain *chain, int event) |
ea7f8277 | 114 | { |
ea7f8277 DB |
115 | struct tcf_proto *tp; |
116 | ||
2190d1d0 JP |
117 | for (tp = rtnl_dereference(chain->filter_chain); |
118 | tp; tp = rtnl_dereference(tp->next)) | |
19a8bb28 | 119 | tfilter_notify(net, oskb, n, tp, 0, event, false); |
ea7f8277 | 120 | } |
1da177e4 LT |
121 | |
122 | /* Select new prio value from the range, managed by kernel. */ | |
123 | ||
aa767bfe | 124 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 125 | { |
aa767bfe | 126 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
127 | |
128 | if (tp) | |
cc7ec456 | 129 | first = tp->prio - 1; |
1da177e4 | 130 | |
7961973a | 131 | return TC_H_MAJ(first); |
1da177e4 LT |
132 | } |
133 | ||
33a48927 | 134 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
6529eaba | 135 | u32 prio, u32 parent, struct Qdisc *q, |
5bc17018 | 136 | struct tcf_chain *chain) |
33a48927 JP |
137 | { |
138 | struct tcf_proto *tp; | |
139 | int err; | |
140 | ||
141 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
142 | if (!tp) | |
143 | return ERR_PTR(-ENOBUFS); | |
144 | ||
145 | err = -ENOENT; | |
146 | tp->ops = tcf_proto_lookup_ops(kind); | |
147 | if (!tp->ops) { | |
148 | #ifdef CONFIG_MODULES | |
149 | rtnl_unlock(); | |
150 | request_module("cls_%s", kind); | |
151 | rtnl_lock(); | |
152 | tp->ops = tcf_proto_lookup_ops(kind); | |
153 | /* We dropped the RTNL semaphore in order to perform | |
154 | * the module load. So, even if we succeeded in loading | |
155 | * the module we have to replay the request. We indicate | |
156 | * this using -EAGAIN. | |
157 | */ | |
158 | if (tp->ops) { | |
159 | module_put(tp->ops->owner); | |
160 | err = -EAGAIN; | |
161 | } else { | |
162 | err = -ENOENT; | |
163 | } | |
164 | goto errout; | |
165 | #endif | |
166 | } | |
167 | tp->classify = tp->ops->classify; | |
168 | tp->protocol = protocol; | |
169 | tp->prio = prio; | |
170 | tp->classid = parent; | |
171 | tp->q = q; | |
5bc17018 | 172 | tp->chain = chain; |
33a48927 JP |
173 | |
174 | err = tp->ops->init(tp); | |
175 | if (err) { | |
176 | module_put(tp->ops->owner); | |
177 | goto errout; | |
178 | } | |
179 | return tp; | |
180 | ||
181 | errout: | |
182 | kfree(tp); | |
183 | return ERR_PTR(err); | |
184 | } | |
185 | ||
763dbf63 | 186 | static void tcf_proto_destroy(struct tcf_proto *tp) |
cf1facda | 187 | { |
763dbf63 WC |
188 | tp->ops->destroy(tp); |
189 | module_put(tp->ops->owner); | |
190 | kfree_rcu(tp, rcu); | |
cf1facda JP |
191 | } |
192 | ||
5bc17018 JP |
193 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
194 | u32 chain_index) | |
2190d1d0 | 195 | { |
5bc17018 JP |
196 | struct tcf_chain *chain; |
197 | ||
198 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
199 | if (!chain) | |
200 | return NULL; | |
201 | list_add_tail(&chain->list, &block->chain_list); | |
202 | chain->block = block; | |
203 | chain->index = chain_index; | |
204 | chain->refcnt = 1; | |
205 | return chain; | |
2190d1d0 JP |
206 | } |
207 | ||
f93e1cdc | 208 | static void tcf_chain_flush(struct tcf_chain *chain) |
cf1facda JP |
209 | { |
210 | struct tcf_proto *tp; | |
211 | ||
f93e1cdc JP |
212 | if (*chain->p_filter_chain) |
213 | RCU_INIT_POINTER(*chain->p_filter_chain, NULL); | |
2190d1d0 JP |
214 | while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) { |
215 | RCU_INIT_POINTER(chain->filter_chain, tp->next); | |
763dbf63 | 216 | tcf_proto_destroy(tp); |
cf1facda | 217 | } |
f93e1cdc JP |
218 | } |
219 | ||
220 | static void tcf_chain_destroy(struct tcf_chain *chain) | |
221 | { | |
222 | list_del(&chain->list); | |
223 | tcf_chain_flush(chain); | |
2190d1d0 JP |
224 | kfree(chain); |
225 | } | |
226 | ||
367a8ce8 WC |
227 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
228 | bool create) | |
5bc17018 JP |
229 | { |
230 | struct tcf_chain *chain; | |
231 | ||
232 | list_for_each_entry(chain, &block->chain_list, list) { | |
233 | if (chain->index == chain_index) { | |
234 | chain->refcnt++; | |
235 | return chain; | |
236 | } | |
237 | } | |
367a8ce8 WC |
238 | if (create) |
239 | return tcf_chain_create(block, chain_index); | |
240 | else | |
241 | return NULL; | |
5bc17018 JP |
242 | } |
243 | EXPORT_SYMBOL(tcf_chain_get); | |
244 | ||
245 | void tcf_chain_put(struct tcf_chain *chain) | |
246 | { | |
247 | /* Destroy unused chain, with exception of chain 0, which is the | |
248 | * default one and has to be always present. | |
249 | */ | |
250 | if (--chain->refcnt == 0 && !chain->filter_chain && chain->index != 0) | |
251 | tcf_chain_destroy(chain); | |
252 | } | |
253 | EXPORT_SYMBOL(tcf_chain_put); | |
254 | ||
2190d1d0 JP |
255 | static void |
256 | tcf_chain_filter_chain_ptr_set(struct tcf_chain *chain, | |
257 | struct tcf_proto __rcu **p_filter_chain) | |
258 | { | |
259 | chain->p_filter_chain = p_filter_chain; | |
cf1facda | 260 | } |
6529eaba JP |
261 | |
262 | int tcf_block_get(struct tcf_block **p_block, | |
263 | struct tcf_proto __rcu **p_filter_chain) | |
264 | { | |
265 | struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL); | |
5bc17018 | 266 | struct tcf_chain *chain; |
2190d1d0 | 267 | int err; |
6529eaba JP |
268 | |
269 | if (!block) | |
270 | return -ENOMEM; | |
5bc17018 JP |
271 | INIT_LIST_HEAD(&block->chain_list); |
272 | /* Create chain 0 by default, it has to be always present. */ | |
273 | chain = tcf_chain_create(block, 0); | |
274 | if (!chain) { | |
2190d1d0 JP |
275 | err = -ENOMEM; |
276 | goto err_chain_create; | |
277 | } | |
5bc17018 | 278 | tcf_chain_filter_chain_ptr_set(chain, p_filter_chain); |
6529eaba JP |
279 | *p_block = block; |
280 | return 0; | |
2190d1d0 JP |
281 | |
282 | err_chain_create: | |
283 | kfree(block); | |
284 | return err; | |
6529eaba JP |
285 | } |
286 | EXPORT_SYMBOL(tcf_block_get); | |
287 | ||
288 | void tcf_block_put(struct tcf_block *block) | |
289 | { | |
5bc17018 JP |
290 | struct tcf_chain *chain, *tmp; |
291 | ||
6529eaba JP |
292 | if (!block) |
293 | return; | |
5bc17018 JP |
294 | |
295 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) | |
296 | tcf_chain_destroy(chain); | |
6529eaba JP |
297 | kfree(block); |
298 | } | |
299 | EXPORT_SYMBOL(tcf_block_put); | |
cf1facda | 300 | |
87d83093 JP |
301 | /* Main classifier routine: scans classifier chain attached |
302 | * to this qdisc, (optionally) tests for protocol and asks | |
303 | * specific classifiers. | |
304 | */ | |
305 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
306 | struct tcf_result *res, bool compat_mode) | |
307 | { | |
308 | __be16 protocol = tc_skb_protocol(skb); | |
309 | #ifdef CONFIG_NET_CLS_ACT | |
310 | const int max_reclassify_loop = 4; | |
ee538dce JP |
311 | const struct tcf_proto *orig_tp = tp; |
312 | const struct tcf_proto *first_tp; | |
87d83093 JP |
313 | int limit = 0; |
314 | ||
315 | reclassify: | |
316 | #endif | |
317 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
318 | int err; | |
319 | ||
320 | if (tp->protocol != protocol && | |
321 | tp->protocol != htons(ETH_P_ALL)) | |
322 | continue; | |
323 | ||
324 | err = tp->classify(skb, tp, res); | |
325 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 326 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 327 | first_tp = orig_tp; |
87d83093 | 328 | goto reset; |
db50514f | 329 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 330 | first_tp = res->goto_tp; |
db50514f JP |
331 | goto reset; |
332 | } | |
87d83093 JP |
333 | #endif |
334 | if (err >= 0) | |
335 | return err; | |
336 | } | |
337 | ||
338 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
339 | #ifdef CONFIG_NET_CLS_ACT | |
340 | reset: | |
341 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
342 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", | |
343 | tp->q->ops->id, tp->prio & 0xffff, | |
344 | ntohs(tp->protocol)); | |
345 | return TC_ACT_SHOT; | |
346 | } | |
347 | ||
ee538dce | 348 | tp = first_tp; |
87d83093 JP |
349 | protocol = tc_skb_protocol(skb); |
350 | goto reclassify; | |
351 | #endif | |
352 | } | |
353 | EXPORT_SYMBOL(tcf_classify); | |
354 | ||
2190d1d0 JP |
355 | struct tcf_chain_info { |
356 | struct tcf_proto __rcu **pprev; | |
357 | struct tcf_proto __rcu *next; | |
358 | }; | |
359 | ||
360 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
361 | { | |
362 | return rtnl_dereference(*chain_info->pprev); | |
363 | } | |
364 | ||
365 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
366 | struct tcf_chain_info *chain_info, | |
367 | struct tcf_proto *tp) | |
368 | { | |
369 | if (chain->p_filter_chain && | |
370 | *chain_info->pprev == chain->filter_chain) | |
31efcc25 | 371 | rcu_assign_pointer(*chain->p_filter_chain, tp); |
2190d1d0 JP |
372 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
373 | rcu_assign_pointer(*chain_info->pprev, tp); | |
374 | } | |
375 | ||
376 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
377 | struct tcf_chain_info *chain_info, | |
378 | struct tcf_proto *tp) | |
379 | { | |
380 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
381 | ||
382 | if (chain->p_filter_chain && tp == chain->filter_chain) | |
31efcc25 | 383 | RCU_INIT_POINTER(*chain->p_filter_chain, next); |
2190d1d0 JP |
384 | RCU_INIT_POINTER(*chain_info->pprev, next); |
385 | } | |
386 | ||
387 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
388 | struct tcf_chain_info *chain_info, | |
389 | u32 protocol, u32 prio, | |
390 | bool prio_allocate) | |
391 | { | |
392 | struct tcf_proto **pprev; | |
393 | struct tcf_proto *tp; | |
394 | ||
395 | /* Check the chain for existence of proto-tcf with this priority */ | |
396 | for (pprev = &chain->filter_chain; | |
397 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
398 | if (tp->prio >= prio) { | |
399 | if (tp->prio == prio) { | |
400 | if (prio_allocate || | |
401 | (tp->protocol != protocol && protocol)) | |
402 | return ERR_PTR(-EINVAL); | |
403 | } else { | |
404 | tp = NULL; | |
405 | } | |
406 | break; | |
407 | } | |
408 | } | |
409 | chain_info->pprev = pprev; | |
410 | chain_info->next = tp ? tp->next : NULL; | |
411 | return tp; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | /* Add/change/delete/get a filter node */ |
415 | ||
c21ef3e3 DA |
416 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
417 | struct netlink_ext_ack *extack) | |
1da177e4 | 418 | { |
3b1e0a65 | 419 | struct net *net = sock_net(skb->sk); |
add93b61 | 420 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
421 | struct tcmsg *t; |
422 | u32 protocol; | |
423 | u32 prio; | |
9d36d9e5 | 424 | bool prio_allocate; |
1da177e4 | 425 | u32 parent; |
5bc17018 | 426 | u32 chain_index; |
1da177e4 LT |
427 | struct net_device *dev; |
428 | struct Qdisc *q; | |
2190d1d0 | 429 | struct tcf_chain_info chain_info; |
5bc17018 | 430 | struct tcf_chain *chain = NULL; |
6529eaba | 431 | struct tcf_block *block; |
1da177e4 | 432 | struct tcf_proto *tp; |
20fea08b | 433 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
434 | unsigned long cl; |
435 | unsigned long fh; | |
436 | int err; | |
628185cf | 437 | int tp_created; |
1da177e4 | 438 | |
4e8bbb81 | 439 | if ((n->nlmsg_type != RTM_GETTFILTER) && |
5f013c9b | 440 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 441 | return -EPERM; |
de179c8c | 442 | |
1da177e4 | 443 | replay: |
628185cf DB |
444 | tp_created = 0; |
445 | ||
c21ef3e3 | 446 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
447 | if (err < 0) |
448 | return err; | |
449 | ||
942b8165 | 450 | t = nlmsg_data(n); |
1da177e4 LT |
451 | protocol = TC_H_MIN(t->tcm_info); |
452 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 453 | prio_allocate = false; |
1da177e4 LT |
454 | parent = t->tcm_parent; |
455 | cl = 0; | |
456 | ||
457 | if (prio == 0) { | |
ea7f8277 DB |
458 | switch (n->nlmsg_type) { |
459 | case RTM_DELTFILTER: | |
9f6ed032 | 460 | if (protocol || t->tcm_handle || tca[TCA_KIND]) |
ea7f8277 DB |
461 | return -ENOENT; |
462 | break; | |
463 | case RTM_NEWTFILTER: | |
464 | /* If no priority is provided by the user, | |
465 | * we allocate one. | |
466 | */ | |
467 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
468 | prio = TC_H_MAKE(0x80000000U, 0U); | |
9d36d9e5 | 469 | prio_allocate = true; |
ea7f8277 DB |
470 | break; |
471 | } | |
472 | /* fall-through */ | |
473 | default: | |
1da177e4 | 474 | return -ENOENT; |
ea7f8277 | 475 | } |
1da177e4 LT |
476 | } |
477 | ||
478 | /* Find head of filter chain. */ | |
479 | ||
480 | /* Find link */ | |
7316ae88 | 481 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 482 | if (dev == NULL) |
1da177e4 LT |
483 | return -ENODEV; |
484 | ||
485 | /* Find qdisc */ | |
486 | if (!parent) { | |
af356afa | 487 | q = dev->qdisc; |
1da177e4 | 488 | parent = q->handle; |
aa767bfe SH |
489 | } else { |
490 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
491 | if (q == NULL) | |
492 | return -EINVAL; | |
493 | } | |
1da177e4 LT |
494 | |
495 | /* Is it classful? */ | |
cc7ec456 ED |
496 | cops = q->ops->cl_ops; |
497 | if (!cops) | |
1da177e4 LT |
498 | return -EINVAL; |
499 | ||
6529eaba | 500 | if (!cops->tcf_block) |
71ebe5e9 PM |
501 | return -EOPNOTSUPP; |
502 | ||
1da177e4 LT |
503 | /* Do we search for filter, attached to class? */ |
504 | if (TC_H_MIN(parent)) { | |
505 | cl = cops->get(q, parent); | |
506 | if (cl == 0) | |
507 | return -ENOENT; | |
508 | } | |
509 | ||
510 | /* And the last stroke */ | |
6529eaba JP |
511 | block = cops->tcf_block(q, cl); |
512 | if (!block) { | |
6bb16e7a | 513 | err = -EINVAL; |
1da177e4 | 514 | goto errout; |
6bb16e7a | 515 | } |
5bc17018 JP |
516 | |
517 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
518 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
519 | err = -EINVAL; | |
520 | goto errout; | |
521 | } | |
367a8ce8 WC |
522 | chain = tcf_chain_get(block, chain_index, |
523 | n->nlmsg_type == RTM_NEWTFILTER); | |
5bc17018 | 524 | if (!chain) { |
367a8ce8 | 525 | err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL; |
5bc17018 JP |
526 | goto errout; |
527 | } | |
6529eaba | 528 | |
ea7f8277 DB |
529 | if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) { |
530 | tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER); | |
f93e1cdc | 531 | tcf_chain_flush(chain); |
ea7f8277 DB |
532 | err = 0; |
533 | goto errout; | |
534 | } | |
1da177e4 | 535 | |
2190d1d0 JP |
536 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
537 | prio, prio_allocate); | |
538 | if (IS_ERR(tp)) { | |
539 | err = PTR_ERR(tp); | |
540 | goto errout; | |
1da177e4 LT |
541 | } |
542 | ||
543 | if (tp == NULL) { | |
544 | /* Proto-tcf does not exist, create new one */ | |
545 | ||
6bb16e7a JP |
546 | if (tca[TCA_KIND] == NULL || !protocol) { |
547 | err = -EINVAL; | |
1da177e4 | 548 | goto errout; |
6bb16e7a | 549 | } |
1da177e4 | 550 | |
cc7ec456 | 551 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
552 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
553 | err = -ENOENT; | |
1da177e4 | 554 | goto errout; |
6bb16e7a | 555 | } |
1da177e4 | 556 | |
9d36d9e5 | 557 | if (prio_allocate) |
2190d1d0 | 558 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 559 | |
33a48927 | 560 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
5bc17018 | 561 | protocol, prio, parent, q, chain); |
33a48927 JP |
562 | if (IS_ERR(tp)) { |
563 | err = PTR_ERR(tp); | |
1da177e4 LT |
564 | goto errout; |
565 | } | |
12186be7 | 566 | tp_created = 1; |
6bb16e7a JP |
567 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
568 | err = -EINVAL; | |
1da177e4 | 569 | goto errout; |
6bb16e7a | 570 | } |
1da177e4 LT |
571 | |
572 | fh = tp->ops->get(tp, t->tcm_handle); | |
573 | ||
574 | if (fh == 0) { | |
575 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
2190d1d0 | 576 | tcf_chain_tp_remove(chain, &chain_info, tp); |
fa59b27c ED |
577 | tfilter_notify(net, skb, n, tp, fh, |
578 | RTM_DELTFILTER, false); | |
763dbf63 | 579 | tcf_proto_destroy(tp); |
1da177e4 LT |
580 | err = 0; |
581 | goto errout; | |
582 | } | |
583 | ||
aa767bfe | 584 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
585 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
586 | err = -ENOENT; | |
1da177e4 | 587 | goto errout; |
6bb16e7a | 588 | } |
1da177e4 | 589 | } else { |
763dbf63 WC |
590 | bool last; |
591 | ||
1da177e4 | 592 | switch (n->nlmsg_type) { |
10297b99 | 593 | case RTM_NEWTFILTER: |
12186be7 MU |
594 | if (n->nlmsg_flags & NLM_F_EXCL) { |
595 | if (tp_created) | |
763dbf63 | 596 | tcf_proto_destroy(tp); |
6bb16e7a | 597 | err = -EEXIST; |
1da177e4 | 598 | goto errout; |
12186be7 | 599 | } |
1da177e4 LT |
600 | break; |
601 | case RTM_DELTFILTER: | |
54df2cf8 WC |
602 | err = tfilter_del_notify(net, skb, n, tp, fh, false, |
603 | &last); | |
40c81b25 JP |
604 | if (err) |
605 | goto errout; | |
763dbf63 | 606 | if (last) { |
2190d1d0 | 607 | tcf_chain_tp_remove(chain, &chain_info, tp); |
763dbf63 WC |
608 | tcf_proto_destroy(tp); |
609 | } | |
d7cf52c2 | 610 | goto errout; |
1da177e4 | 611 | case RTM_GETTFILTER: |
5a7a5555 | 612 | err = tfilter_notify(net, skb, n, tp, fh, |
fa59b27c | 613 | RTM_NEWTFILTER, true); |
1da177e4 LT |
614 | goto errout; |
615 | default: | |
616 | err = -EINVAL; | |
617 | goto errout; | |
618 | } | |
619 | } | |
620 | ||
2f7ef2f8 CW |
621 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
622 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); | |
12186be7 | 623 | if (err == 0) { |
2190d1d0 JP |
624 | if (tp_created) |
625 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
fa59b27c | 626 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false); |
12186be7 MU |
627 | } else { |
628 | if (tp_created) | |
763dbf63 | 629 | tcf_proto_destroy(tp); |
12186be7 | 630 | } |
1da177e4 LT |
631 | |
632 | errout: | |
5bc17018 JP |
633 | if (chain) |
634 | tcf_chain_put(chain); | |
1da177e4 LT |
635 | if (cl) |
636 | cops->put(q, cl); | |
637 | if (err == -EAGAIN) | |
638 | /* Replay the request. */ | |
639 | goto replay; | |
640 | return err; | |
641 | } | |
642 | ||
0b0f43fe JHS |
643 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
644 | struct tcf_proto *tp, unsigned long fh, u32 portid, | |
645 | u32 seq, u16 flags, int event) | |
1da177e4 LT |
646 | { |
647 | struct tcmsg *tcm; | |
648 | struct nlmsghdr *nlh; | |
27a884dc | 649 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 650 | |
15e47304 | 651 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
652 | if (!nlh) |
653 | goto out_nlmsg_trim; | |
654 | tcm = nlmsg_data(nlh); | |
1da177e4 | 655 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 656 | tcm->tcm__pad1 = 0; |
ad61df91 | 657 | tcm->tcm__pad2 = 0; |
5ce2d488 | 658 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
659 | tcm->tcm_parent = tp->classid; |
660 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
661 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
662 | goto nla_put_failure; | |
5bc17018 JP |
663 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) |
664 | goto nla_put_failure; | |
54df2cf8 | 665 | if (!fh) { |
1da177e4 | 666 | tcm->tcm_handle = 0; |
54df2cf8 | 667 | } else { |
832d1d5b | 668 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) |
add93b61 | 669 | goto nla_put_failure; |
1da177e4 | 670 | } |
27a884dc | 671 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
672 | return skb->len; |
673 | ||
942b8165 | 674 | out_nlmsg_trim: |
add93b61 | 675 | nla_put_failure: |
dc5fc579 | 676 | nlmsg_trim(skb, b); |
1da177e4 LT |
677 | return -1; |
678 | } | |
679 | ||
7316ae88 TG |
680 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
681 | struct nlmsghdr *n, struct tcf_proto *tp, | |
fa59b27c | 682 | unsigned long fh, int event, bool unicast) |
1da177e4 LT |
683 | { |
684 | struct sk_buff *skb; | |
15e47304 | 685 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
686 | |
687 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
688 | if (!skb) | |
689 | return -ENOBUFS; | |
690 | ||
30a391a1 RM |
691 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, |
692 | n->nlmsg_flags, event) <= 0) { | |
1da177e4 LT |
693 | kfree_skb(skb); |
694 | return -EINVAL; | |
695 | } | |
696 | ||
fa59b27c ED |
697 | if (unicast) |
698 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
699 | ||
15e47304 | 700 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 701 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
702 | } |
703 | ||
54df2cf8 WC |
704 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, |
705 | struct nlmsghdr *n, struct tcf_proto *tp, | |
706 | unsigned long fh, bool unicast, bool *last) | |
707 | { | |
708 | struct sk_buff *skb; | |
709 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
710 | int err; | |
711 | ||
712 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
713 | if (!skb) | |
714 | return -ENOBUFS; | |
715 | ||
716 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, | |
717 | n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
718 | kfree_skb(skb); | |
719 | return -EINVAL; | |
720 | } | |
721 | ||
722 | err = tp->ops->delete(tp, fh, last); | |
723 | if (err) { | |
724 | kfree_skb(skb); | |
725 | return err; | |
726 | } | |
727 | ||
728 | if (unicast) | |
729 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
730 | ||
731 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
732 | n->nlmsg_flags & NLM_F_ECHO); | |
733 | } | |
734 | ||
aa767bfe | 735 | struct tcf_dump_args { |
1da177e4 LT |
736 | struct tcf_walker w; |
737 | struct sk_buff *skb; | |
738 | struct netlink_callback *cb; | |
739 | }; | |
740 | ||
aa767bfe SH |
741 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
742 | struct tcf_walker *arg) | |
1da177e4 | 743 | { |
aa767bfe | 744 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 745 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 746 | |
832d1d5b | 747 | return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
748 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
749 | RTM_NEWTFILTER); | |
1da177e4 LT |
750 | } |
751 | ||
5bc17018 | 752 | static bool tcf_chain_dump(struct tcf_chain *chain, struct sk_buff *skb, |
acb31fae JP |
753 | struct netlink_callback *cb, |
754 | long index_start, long *p_index) | |
755 | { | |
756 | struct net *net = sock_net(skb->sk); | |
757 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
758 | struct tcf_dump_args arg; | |
759 | struct tcf_proto *tp; | |
760 | ||
761 | for (tp = rtnl_dereference(chain->filter_chain); | |
762 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
763 | if (*p_index < index_start) | |
764 | continue; | |
765 | if (TC_H_MAJ(tcm->tcm_info) && | |
766 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
767 | continue; | |
768 | if (TC_H_MIN(tcm->tcm_info) && | |
769 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
770 | continue; | |
771 | if (*p_index > index_start) | |
772 | memset(&cb->args[1], 0, | |
773 | sizeof(cb->args) - sizeof(cb->args[0])); | |
774 | if (cb->args[1] == 0) { | |
775 | if (tcf_fill_node(net, skb, tp, 0, | |
776 | NETLINK_CB(cb->skb).portid, | |
777 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
778 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 779 | return false; |
acb31fae JP |
780 | |
781 | cb->args[1] = 1; | |
782 | } | |
783 | if (!tp->ops->walk) | |
784 | continue; | |
785 | arg.w.fn = tcf_node_dump; | |
786 | arg.skb = skb; | |
787 | arg.cb = cb; | |
788 | arg.w.stop = 0; | |
789 | arg.w.skip = cb->args[1] - 1; | |
790 | arg.w.count = 0; | |
791 | tp->ops->walk(tp, &arg.w); | |
792 | cb->args[1] = arg.w.count + 1; | |
793 | if (arg.w.stop) | |
5bc17018 | 794 | return false; |
acb31fae | 795 | } |
5bc17018 | 796 | return true; |
acb31fae JP |
797 | } |
798 | ||
bd27a875 | 799 | /* called with RTNL */ |
1da177e4 LT |
800 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
801 | { | |
3b1e0a65 | 802 | struct net *net = sock_net(skb->sk); |
5bc17018 | 803 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
804 | struct net_device *dev; |
805 | struct Qdisc *q; | |
6529eaba | 806 | struct tcf_block *block; |
2190d1d0 | 807 | struct tcf_chain *chain; |
942b8165 | 808 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 809 | unsigned long cl = 0; |
20fea08b | 810 | const struct Qdisc_class_ops *cops; |
acb31fae JP |
811 | long index_start; |
812 | long index; | |
5bc17018 | 813 | int err; |
1da177e4 | 814 | |
573ce260 | 815 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 816 | return skb->len; |
5bc17018 JP |
817 | |
818 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
819 | if (err) | |
820 | return err; | |
821 | ||
cc7ec456 ED |
822 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
823 | if (!dev) | |
1da177e4 LT |
824 | return skb->len; |
825 | ||
1da177e4 | 826 | if (!tcm->tcm_parent) |
af356afa | 827 | q = dev->qdisc; |
1da177e4 LT |
828 | else |
829 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
830 | if (!q) | |
831 | goto out; | |
cc7ec456 ED |
832 | cops = q->ops->cl_ops; |
833 | if (!cops) | |
1da177e4 | 834 | goto errout; |
6529eaba | 835 | if (!cops->tcf_block) |
71ebe5e9 | 836 | goto errout; |
1da177e4 LT |
837 | if (TC_H_MIN(tcm->tcm_parent)) { |
838 | cl = cops->get(q, tcm->tcm_parent); | |
839 | if (cl == 0) | |
840 | goto errout; | |
841 | } | |
6529eaba JP |
842 | block = cops->tcf_block(q, cl); |
843 | if (!block) | |
1da177e4 LT |
844 | goto errout; |
845 | ||
acb31fae JP |
846 | index_start = cb->args[0]; |
847 | index = 0; | |
5bc17018 JP |
848 | |
849 | list_for_each_entry(chain, &block->chain_list, list) { | |
850 | if (tca[TCA_CHAIN] && | |
851 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
852 | continue; | |
853 | if (!tcf_chain_dump(chain, skb, cb, index_start, &index)) | |
854 | break; | |
855 | } | |
856 | ||
acb31fae | 857 | cb->args[0] = index; |
1da177e4 LT |
858 | |
859 | errout: | |
860 | if (cl) | |
861 | cops->put(q, cl); | |
862 | out: | |
1da177e4 LT |
863 | return skb->len; |
864 | } | |
865 | ||
18d0264f | 866 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
867 | { |
868 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
869 | LIST_HEAD(actions); |
870 | ||
871 | tcf_exts_to_list(exts, &actions); | |
872 | tcf_action_destroy(&actions, TCA_ACT_UNBIND); | |
873 | kfree(exts->actions); | |
874 | exts->nr_actions = 0; | |
1da177e4 LT |
875 | #endif |
876 | } | |
aa767bfe | 877 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 878 | |
c1b52739 | 879 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
5a7a5555 | 880 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) |
1da177e4 | 881 | { |
1da177e4 LT |
882 | #ifdef CONFIG_NET_CLS_ACT |
883 | { | |
1da177e4 LT |
884 | struct tc_action *act; |
885 | ||
5da57f42 | 886 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
887 | act = tcf_action_init_1(net, tp, tb[exts->police], |
888 | rate_tlv, "police", ovr, | |
889 | TCA_ACT_BIND); | |
ab27cfb8 PM |
890 | if (IS_ERR(act)) |
891 | return PTR_ERR(act); | |
1da177e4 | 892 | |
33be6271 | 893 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
894 | exts->actions[0] = act; |
895 | exts->nr_actions = 1; | |
5da57f42 | 896 | } else if (exts->action && tb[exts->action]) { |
22dc13c8 WC |
897 | LIST_HEAD(actions); |
898 | int err, i = 0; | |
899 | ||
9fb9f251 JP |
900 | err = tcf_action_init(net, tp, tb[exts->action], |
901 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
5a7a5555 | 902 | &actions); |
33be6271 WC |
903 | if (err) |
904 | return err; | |
22dc13c8 WC |
905 | list_for_each_entry(act, &actions, list) |
906 | exts->actions[i++] = act; | |
907 | exts->nr_actions = i; | |
1da177e4 LT |
908 | } |
909 | } | |
1da177e4 | 910 | #else |
5da57f42 WC |
911 | if ((exts->action && tb[exts->action]) || |
912 | (exts->police && tb[exts->police])) | |
1da177e4 LT |
913 | return -EOPNOTSUPP; |
914 | #endif | |
915 | ||
916 | return 0; | |
917 | } | |
aa767bfe | 918 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 919 | |
9b0d4446 | 920 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
921 | { |
922 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
923 | struct tcf_exts old = *dst; |
924 | ||
9b0d4446 | 925 | *dst = *src; |
22dc13c8 | 926 | tcf_exts_destroy(&old); |
1da177e4 LT |
927 | #endif |
928 | } | |
aa767bfe | 929 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 930 | |
22dc13c8 WC |
931 | #ifdef CONFIG_NET_CLS_ACT |
932 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
933 | { | |
934 | if (exts->nr_actions == 0) | |
935 | return NULL; | |
936 | else | |
937 | return exts->actions[0]; | |
938 | } | |
939 | #endif | |
33be6271 | 940 | |
5da57f42 | 941 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
942 | { |
943 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
944 | struct nlattr *nest; |
945 | ||
978dfd8d | 946 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
947 | /* |
948 | * again for backward compatible mode - we want | |
949 | * to work with both old and new modes of entering | |
950 | * tc data even if iproute2 was newer - jhs | |
951 | */ | |
33be6271 | 952 | if (exts->type != TCA_OLD_COMPAT) { |
22dc13c8 WC |
953 | LIST_HEAD(actions); |
954 | ||
5da57f42 | 955 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
956 | if (nest == NULL) |
957 | goto nla_put_failure; | |
22dc13c8 WC |
958 | |
959 | tcf_exts_to_list(exts, &actions); | |
960 | if (tcf_action_dump(skb, &actions, 0, 0) < 0) | |
add93b61 | 961 | goto nla_put_failure; |
4b3550ef | 962 | nla_nest_end(skb, nest); |
5da57f42 | 963 | } else if (exts->police) { |
33be6271 | 964 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 965 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 966 | if (nest == NULL || !act) |
4b3550ef | 967 | goto nla_put_failure; |
33be6271 | 968 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 969 | goto nla_put_failure; |
4b3550ef | 970 | nla_nest_end(skb, nest); |
1da177e4 LT |
971 | } |
972 | } | |
1da177e4 | 973 | return 0; |
9cc63db5 CW |
974 | |
975 | nla_put_failure: | |
976 | nla_nest_cancel(skb, nest); | |
1da177e4 | 977 | return -1; |
9cc63db5 CW |
978 | #else |
979 | return 0; | |
980 | #endif | |
1da177e4 | 981 | } |
aa767bfe | 982 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 983 | |
aa767bfe | 984 | |
5da57f42 | 985 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
986 | { |
987 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 988 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 989 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 990 | return -1; |
1da177e4 LT |
991 | #endif |
992 | return 0; | |
1da177e4 | 993 | } |
aa767bfe | 994 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 995 | |
7091d8c7 HHZ |
996 | int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts, |
997 | struct net_device **hw_dev) | |
998 | { | |
999 | #ifdef CONFIG_NET_CLS_ACT | |
1000 | const struct tc_action *a; | |
1001 | LIST_HEAD(actions); | |
1002 | ||
3bcc0cec | 1003 | if (!tcf_exts_has_actions(exts)) |
7091d8c7 HHZ |
1004 | return -EINVAL; |
1005 | ||
1006 | tcf_exts_to_list(exts, &actions); | |
1007 | list_for_each_entry(a, &actions, list) { | |
1008 | if (a->ops->get_dev) { | |
1009 | a->ops->get_dev(a, dev_net(dev), hw_dev); | |
1010 | break; | |
1011 | } | |
1012 | } | |
1013 | if (*hw_dev) | |
1014 | return 0; | |
1015 | #endif | |
1016 | return -EOPNOTSUPP; | |
1017 | } | |
1018 | EXPORT_SYMBOL(tcf_exts_get_dev); | |
1019 | ||
1da177e4 LT |
1020 | static int __init tc_filter_init(void) |
1021 | { | |
c7ac8679 GR |
1022 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
1023 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 1024 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 1025 | tc_dump_tfilter, NULL); |
1da177e4 | 1026 | |
1da177e4 LT |
1027 | return 0; |
1028 | } | |
1029 | ||
1030 | subsys_initcall(tc_filter_init); |