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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> | |
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 | 79 | |
7aa0045d CW |
80 | static struct workqueue_struct *tc_filter_wq; |
81 | ||
1da177e4 LT |
82 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) |
83 | { | |
36272874 | 84 | struct tcf_proto_ops *t; |
1da177e4 LT |
85 | int rc = -ENOENT; |
86 | ||
c78e1746 DB |
87 | /* Wait for outstanding call_rcu()s, if any, from a |
88 | * tcf_proto_ops's destroy() handler. | |
89 | */ | |
90 | rcu_barrier(); | |
7aa0045d | 91 | flush_workqueue(tc_filter_wq); |
c78e1746 | 92 | |
1da177e4 | 93 | write_lock(&cls_mod_lock); |
dcd76081 ED |
94 | list_for_each_entry(t, &tcf_proto_base, head) { |
95 | if (t == ops) { | |
96 | list_del(&t->head); | |
97 | rc = 0; | |
1da177e4 | 98 | break; |
dcd76081 ED |
99 | } |
100 | } | |
1da177e4 LT |
101 | write_unlock(&cls_mod_lock); |
102 | return rc; | |
103 | } | |
aa767bfe | 104 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 105 | |
7aa0045d CW |
106 | bool tcf_queue_work(struct work_struct *work) |
107 | { | |
108 | return queue_work(tc_filter_wq, work); | |
109 | } | |
110 | EXPORT_SYMBOL(tcf_queue_work); | |
111 | ||
1da177e4 LT |
112 | /* Select new prio value from the range, managed by kernel. */ |
113 | ||
aa767bfe | 114 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 115 | { |
aa767bfe | 116 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
117 | |
118 | if (tp) | |
cc7ec456 | 119 | first = tp->prio - 1; |
1da177e4 | 120 | |
7961973a | 121 | return TC_H_MAJ(first); |
1da177e4 LT |
122 | } |
123 | ||
33a48927 | 124 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
6529eaba | 125 | u32 prio, u32 parent, struct Qdisc *q, |
5bc17018 | 126 | struct tcf_chain *chain) |
33a48927 JP |
127 | { |
128 | struct tcf_proto *tp; | |
129 | int err; | |
130 | ||
131 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
132 | if (!tp) | |
133 | return ERR_PTR(-ENOBUFS); | |
134 | ||
135 | err = -ENOENT; | |
136 | tp->ops = tcf_proto_lookup_ops(kind); | |
137 | if (!tp->ops) { | |
138 | #ifdef CONFIG_MODULES | |
139 | rtnl_unlock(); | |
140 | request_module("cls_%s", kind); | |
141 | rtnl_lock(); | |
142 | tp->ops = tcf_proto_lookup_ops(kind); | |
143 | /* We dropped the RTNL semaphore in order to perform | |
144 | * the module load. So, even if we succeeded in loading | |
145 | * the module we have to replay the request. We indicate | |
146 | * this using -EAGAIN. | |
147 | */ | |
148 | if (tp->ops) { | |
149 | module_put(tp->ops->owner); | |
150 | err = -EAGAIN; | |
151 | } else { | |
152 | err = -ENOENT; | |
153 | } | |
154 | goto errout; | |
155 | #endif | |
156 | } | |
157 | tp->classify = tp->ops->classify; | |
158 | tp->protocol = protocol; | |
159 | tp->prio = prio; | |
160 | tp->classid = parent; | |
161 | tp->q = q; | |
5bc17018 | 162 | tp->chain = chain; |
33a48927 JP |
163 | |
164 | err = tp->ops->init(tp); | |
165 | if (err) { | |
166 | module_put(tp->ops->owner); | |
167 | goto errout; | |
168 | } | |
169 | return tp; | |
170 | ||
171 | errout: | |
172 | kfree(tp); | |
173 | return ERR_PTR(err); | |
174 | } | |
175 | ||
763dbf63 | 176 | static void tcf_proto_destroy(struct tcf_proto *tp) |
cf1facda | 177 | { |
763dbf63 WC |
178 | tp->ops->destroy(tp); |
179 | module_put(tp->ops->owner); | |
180 | kfree_rcu(tp, rcu); | |
cf1facda JP |
181 | } |
182 | ||
5bc17018 JP |
183 | static struct tcf_chain *tcf_chain_create(struct tcf_block *block, |
184 | u32 chain_index) | |
2190d1d0 | 185 | { |
5bc17018 JP |
186 | struct tcf_chain *chain; |
187 | ||
188 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
189 | if (!chain) | |
190 | return NULL; | |
191 | list_add_tail(&chain->list, &block->chain_list); | |
192 | chain->block = block; | |
193 | chain->index = chain_index; | |
e2ef7544 | 194 | chain->refcnt = 1; |
5bc17018 | 195 | return chain; |
2190d1d0 JP |
196 | } |
197 | ||
f93e1cdc | 198 | static void tcf_chain_flush(struct tcf_chain *chain) |
cf1facda JP |
199 | { |
200 | struct tcf_proto *tp; | |
201 | ||
acc8b316 | 202 | if (chain->p_filter_chain) |
f93e1cdc | 203 | RCU_INIT_POINTER(*chain->p_filter_chain, NULL); |
2190d1d0 JP |
204 | while ((tp = rtnl_dereference(chain->filter_chain)) != NULL) { |
205 | RCU_INIT_POINTER(chain->filter_chain, tp->next); | |
e2ef7544 | 206 | tcf_chain_put(chain); |
763dbf63 | 207 | tcf_proto_destroy(tp); |
cf1facda | 208 | } |
f93e1cdc JP |
209 | } |
210 | ||
211 | static void tcf_chain_destroy(struct tcf_chain *chain) | |
212 | { | |
e2ef7544 CW |
213 | list_del(&chain->list); |
214 | kfree(chain); | |
215 | } | |
744a4cf6 | 216 | |
e2ef7544 CW |
217 | static void tcf_chain_hold(struct tcf_chain *chain) |
218 | { | |
219 | ++chain->refcnt; | |
2190d1d0 JP |
220 | } |
221 | ||
367a8ce8 WC |
222 | struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index, |
223 | bool create) | |
5bc17018 JP |
224 | { |
225 | struct tcf_chain *chain; | |
226 | ||
227 | list_for_each_entry(chain, &block->chain_list, list) { | |
e2ef7544 CW |
228 | if (chain->index == chain_index) { |
229 | tcf_chain_hold(chain); | |
230 | return chain; | |
231 | } | |
5bc17018 | 232 | } |
80532384 | 233 | |
e2ef7544 | 234 | return create ? tcf_chain_create(block, chain_index) : NULL; |
5bc17018 JP |
235 | } |
236 | EXPORT_SYMBOL(tcf_chain_get); | |
237 | ||
238 | void tcf_chain_put(struct tcf_chain *chain) | |
239 | { | |
e2ef7544 | 240 | if (--chain->refcnt == 0) |
5bc17018 JP |
241 | tcf_chain_destroy(chain); |
242 | } | |
243 | EXPORT_SYMBOL(tcf_chain_put); | |
244 | ||
2190d1d0 JP |
245 | static void |
246 | tcf_chain_filter_chain_ptr_set(struct tcf_chain *chain, | |
247 | struct tcf_proto __rcu **p_filter_chain) | |
248 | { | |
249 | chain->p_filter_chain = p_filter_chain; | |
cf1facda | 250 | } |
6529eaba JP |
251 | |
252 | int tcf_block_get(struct tcf_block **p_block, | |
253 | struct tcf_proto __rcu **p_filter_chain) | |
254 | { | |
255 | struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL); | |
5bc17018 | 256 | struct tcf_chain *chain; |
2190d1d0 | 257 | int err; |
6529eaba JP |
258 | |
259 | if (!block) | |
260 | return -ENOMEM; | |
5bc17018 JP |
261 | INIT_LIST_HEAD(&block->chain_list); |
262 | /* Create chain 0 by default, it has to be always present. */ | |
263 | chain = tcf_chain_create(block, 0); | |
264 | if (!chain) { | |
2190d1d0 JP |
265 | err = -ENOMEM; |
266 | goto err_chain_create; | |
267 | } | |
5bc17018 | 268 | tcf_chain_filter_chain_ptr_set(chain, p_filter_chain); |
6529eaba JP |
269 | *p_block = block; |
270 | return 0; | |
2190d1d0 JP |
271 | |
272 | err_chain_create: | |
273 | kfree(block); | |
274 | return err; | |
6529eaba JP |
275 | } |
276 | EXPORT_SYMBOL(tcf_block_get); | |
277 | ||
7aa0045d | 278 | static void tcf_block_put_final(struct work_struct *work) |
6529eaba | 279 | { |
7aa0045d | 280 | struct tcf_block *block = container_of(work, struct tcf_block, work); |
5bc17018 JP |
281 | struct tcf_chain *chain, *tmp; |
282 | ||
7aa0045d | 283 | rtnl_lock(); |
822e86d9 | 284 | /* Only chain 0 should be still here. */ |
7aa0045d CW |
285 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) |
286 | tcf_chain_put(chain); | |
287 | rtnl_unlock(); | |
288 | kfree(block); | |
289 | } | |
1697c4bb | 290 | |
7aa0045d | 291 | /* XXX: Standalone actions are not allowed to jump to any chain, and bound |
822e86d9 CW |
292 | * actions should be all removed after flushing. However, filters are now |
293 | * destroyed in tc filter workqueue with RTNL lock, they can not race here. | |
7aa0045d | 294 | */ |
822e86d9 | 295 | void tcf_block_put(struct tcf_block *block) |
7aa0045d | 296 | { |
822e86d9 | 297 | struct tcf_chain *chain, *tmp; |
1697c4bb | 298 | |
822e86d9 CW |
299 | if (!block) |
300 | return; | |
1697c4bb | 301 | |
822e86d9 | 302 | list_for_each_entry_safe(chain, tmp, &block->chain_list, list) |
30d65e8f | 303 | tcf_chain_flush(chain); |
e2ef7544 | 304 | |
7aa0045d CW |
305 | INIT_WORK(&block->work, tcf_block_put_final); |
306 | /* Wait for RCU callbacks to release the reference count and make | |
307 | * sure their works have been queued before this. | |
308 | */ | |
1697c4bb | 309 | rcu_barrier(); |
7aa0045d | 310 | tcf_queue_work(&block->work); |
6529eaba JP |
311 | } |
312 | EXPORT_SYMBOL(tcf_block_put); | |
cf1facda | 313 | |
87d83093 JP |
314 | /* Main classifier routine: scans classifier chain attached |
315 | * to this qdisc, (optionally) tests for protocol and asks | |
316 | * specific classifiers. | |
317 | */ | |
318 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
319 | struct tcf_result *res, bool compat_mode) | |
320 | { | |
321 | __be16 protocol = tc_skb_protocol(skb); | |
322 | #ifdef CONFIG_NET_CLS_ACT | |
323 | const int max_reclassify_loop = 4; | |
ee538dce JP |
324 | const struct tcf_proto *orig_tp = tp; |
325 | const struct tcf_proto *first_tp; | |
87d83093 JP |
326 | int limit = 0; |
327 | ||
328 | reclassify: | |
329 | #endif | |
330 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
331 | int err; | |
332 | ||
333 | if (tp->protocol != protocol && | |
334 | tp->protocol != htons(ETH_P_ALL)) | |
335 | continue; | |
336 | ||
337 | err = tp->classify(skb, tp, res); | |
338 | #ifdef CONFIG_NET_CLS_ACT | |
db50514f | 339 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) { |
ee538dce | 340 | first_tp = orig_tp; |
87d83093 | 341 | goto reset; |
db50514f | 342 | } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) { |
ee538dce | 343 | first_tp = res->goto_tp; |
db50514f JP |
344 | goto reset; |
345 | } | |
87d83093 JP |
346 | #endif |
347 | if (err >= 0) | |
348 | return err; | |
349 | } | |
350 | ||
351 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
352 | #ifdef CONFIG_NET_CLS_ACT | |
353 | reset: | |
354 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
355 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", | |
356 | tp->q->ops->id, tp->prio & 0xffff, | |
357 | ntohs(tp->protocol)); | |
358 | return TC_ACT_SHOT; | |
359 | } | |
360 | ||
ee538dce | 361 | tp = first_tp; |
87d83093 JP |
362 | protocol = tc_skb_protocol(skb); |
363 | goto reclassify; | |
364 | #endif | |
365 | } | |
366 | EXPORT_SYMBOL(tcf_classify); | |
367 | ||
2190d1d0 JP |
368 | struct tcf_chain_info { |
369 | struct tcf_proto __rcu **pprev; | |
370 | struct tcf_proto __rcu *next; | |
371 | }; | |
372 | ||
373 | static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info) | |
374 | { | |
375 | return rtnl_dereference(*chain_info->pprev); | |
376 | } | |
377 | ||
378 | static void tcf_chain_tp_insert(struct tcf_chain *chain, | |
379 | struct tcf_chain_info *chain_info, | |
380 | struct tcf_proto *tp) | |
381 | { | |
382 | if (chain->p_filter_chain && | |
383 | *chain_info->pprev == chain->filter_chain) | |
31efcc25 | 384 | rcu_assign_pointer(*chain->p_filter_chain, tp); |
2190d1d0 JP |
385 | RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info)); |
386 | rcu_assign_pointer(*chain_info->pprev, tp); | |
e2ef7544 | 387 | tcf_chain_hold(chain); |
2190d1d0 JP |
388 | } |
389 | ||
390 | static void tcf_chain_tp_remove(struct tcf_chain *chain, | |
391 | struct tcf_chain_info *chain_info, | |
392 | struct tcf_proto *tp) | |
393 | { | |
394 | struct tcf_proto *next = rtnl_dereference(chain_info->next); | |
395 | ||
396 | if (chain->p_filter_chain && tp == chain->filter_chain) | |
31efcc25 | 397 | RCU_INIT_POINTER(*chain->p_filter_chain, next); |
2190d1d0 | 398 | RCU_INIT_POINTER(*chain_info->pprev, next); |
e2ef7544 | 399 | tcf_chain_put(chain); |
2190d1d0 JP |
400 | } |
401 | ||
402 | static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain, | |
403 | struct tcf_chain_info *chain_info, | |
404 | u32 protocol, u32 prio, | |
405 | bool prio_allocate) | |
406 | { | |
407 | struct tcf_proto **pprev; | |
408 | struct tcf_proto *tp; | |
409 | ||
410 | /* Check the chain for existence of proto-tcf with this priority */ | |
411 | for (pprev = &chain->filter_chain; | |
412 | (tp = rtnl_dereference(*pprev)); pprev = &tp->next) { | |
413 | if (tp->prio >= prio) { | |
414 | if (tp->prio == prio) { | |
415 | if (prio_allocate || | |
416 | (tp->protocol != protocol && protocol)) | |
417 | return ERR_PTR(-EINVAL); | |
418 | } else { | |
419 | tp = NULL; | |
420 | } | |
421 | break; | |
422 | } | |
423 | } | |
424 | chain_info->pprev = pprev; | |
425 | chain_info->next = tp ? tp->next : NULL; | |
426 | return tp; | |
427 | } | |
428 | ||
7120371c WC |
429 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
430 | struct tcf_proto *tp, void *fh, u32 portid, | |
431 | u32 seq, u16 flags, int event) | |
432 | { | |
433 | struct tcmsg *tcm; | |
434 | struct nlmsghdr *nlh; | |
435 | unsigned char *b = skb_tail_pointer(skb); | |
436 | ||
437 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
438 | if (!nlh) | |
439 | goto out_nlmsg_trim; | |
440 | tcm = nlmsg_data(nlh); | |
441 | tcm->tcm_family = AF_UNSPEC; | |
442 | tcm->tcm__pad1 = 0; | |
443 | tcm->tcm__pad2 = 0; | |
444 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; | |
445 | tcm->tcm_parent = tp->classid; | |
446 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
447 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) | |
448 | goto nla_put_failure; | |
449 | if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index)) | |
450 | goto nla_put_failure; | |
451 | if (!fh) { | |
452 | tcm->tcm_handle = 0; | |
453 | } else { | |
454 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) | |
455 | goto nla_put_failure; | |
456 | } | |
457 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
458 | return skb->len; | |
459 | ||
460 | out_nlmsg_trim: | |
461 | nla_put_failure: | |
462 | nlmsg_trim(skb, b); | |
463 | return -1; | |
464 | } | |
465 | ||
466 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, | |
467 | struct nlmsghdr *n, struct tcf_proto *tp, | |
468 | void *fh, int event, bool unicast) | |
469 | { | |
470 | struct sk_buff *skb; | |
471 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
472 | ||
473 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
474 | if (!skb) | |
475 | return -ENOBUFS; | |
476 | ||
477 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, | |
478 | n->nlmsg_flags, event) <= 0) { | |
479 | kfree_skb(skb); | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
483 | if (unicast) | |
484 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
485 | ||
486 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
487 | n->nlmsg_flags & NLM_F_ECHO); | |
488 | } | |
489 | ||
490 | static int tfilter_del_notify(struct net *net, struct sk_buff *oskb, | |
491 | struct nlmsghdr *n, struct tcf_proto *tp, | |
492 | void *fh, bool unicast, bool *last) | |
493 | { | |
494 | struct sk_buff *skb; | |
495 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
496 | int err; | |
497 | ||
498 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
499 | if (!skb) | |
500 | return -ENOBUFS; | |
501 | ||
502 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, | |
503 | n->nlmsg_flags, RTM_DELTFILTER) <= 0) { | |
504 | kfree_skb(skb); | |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | err = tp->ops->delete(tp, fh, last); | |
509 | if (err) { | |
510 | kfree_skb(skb); | |
511 | return err; | |
512 | } | |
513 | ||
514 | if (unicast) | |
515 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
516 | ||
517 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
518 | n->nlmsg_flags & NLM_F_ECHO); | |
519 | } | |
520 | ||
521 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, | |
522 | struct nlmsghdr *n, | |
523 | struct tcf_chain *chain, int event) | |
524 | { | |
525 | struct tcf_proto *tp; | |
526 | ||
527 | for (tp = rtnl_dereference(chain->filter_chain); | |
528 | tp; tp = rtnl_dereference(tp->next)) | |
529 | tfilter_notify(net, oskb, n, tp, 0, event, false); | |
530 | } | |
531 | ||
1da177e4 LT |
532 | /* Add/change/delete/get a filter node */ |
533 | ||
c21ef3e3 DA |
534 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
535 | struct netlink_ext_ack *extack) | |
1da177e4 | 536 | { |
3b1e0a65 | 537 | struct net *net = sock_net(skb->sk); |
add93b61 | 538 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
539 | struct tcmsg *t; |
540 | u32 protocol; | |
541 | u32 prio; | |
9d36d9e5 | 542 | bool prio_allocate; |
1da177e4 | 543 | u32 parent; |
5bc17018 | 544 | u32 chain_index; |
1da177e4 LT |
545 | struct net_device *dev; |
546 | struct Qdisc *q; | |
2190d1d0 | 547 | struct tcf_chain_info chain_info; |
5bc17018 | 548 | struct tcf_chain *chain = NULL; |
6529eaba | 549 | struct tcf_block *block; |
1da177e4 | 550 | struct tcf_proto *tp; |
20fea08b | 551 | const struct Qdisc_class_ops *cops; |
1da177e4 | 552 | unsigned long cl; |
8113c095 | 553 | void *fh; |
1da177e4 | 554 | int err; |
628185cf | 555 | int tp_created; |
1da177e4 | 556 | |
4e8bbb81 | 557 | if ((n->nlmsg_type != RTM_GETTFILTER) && |
5f013c9b | 558 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 559 | return -EPERM; |
de179c8c | 560 | |
1da177e4 | 561 | replay: |
628185cf DB |
562 | tp_created = 0; |
563 | ||
c21ef3e3 | 564 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
565 | if (err < 0) |
566 | return err; | |
567 | ||
942b8165 | 568 | t = nlmsg_data(n); |
1da177e4 LT |
569 | protocol = TC_H_MIN(t->tcm_info); |
570 | prio = TC_H_MAJ(t->tcm_info); | |
9d36d9e5 | 571 | prio_allocate = false; |
1da177e4 LT |
572 | parent = t->tcm_parent; |
573 | cl = 0; | |
574 | ||
575 | if (prio == 0) { | |
ea7f8277 DB |
576 | switch (n->nlmsg_type) { |
577 | case RTM_DELTFILTER: | |
9f6ed032 | 578 | if (protocol || t->tcm_handle || tca[TCA_KIND]) |
ea7f8277 DB |
579 | return -ENOENT; |
580 | break; | |
581 | case RTM_NEWTFILTER: | |
582 | /* If no priority is provided by the user, | |
583 | * we allocate one. | |
584 | */ | |
585 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
586 | prio = TC_H_MAKE(0x80000000U, 0U); | |
9d36d9e5 | 587 | prio_allocate = true; |
ea7f8277 DB |
588 | break; |
589 | } | |
590 | /* fall-through */ | |
591 | default: | |
1da177e4 | 592 | return -ENOENT; |
ea7f8277 | 593 | } |
1da177e4 LT |
594 | } |
595 | ||
596 | /* Find head of filter chain. */ | |
597 | ||
598 | /* Find link */ | |
7316ae88 | 599 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 600 | if (dev == NULL) |
1da177e4 LT |
601 | return -ENODEV; |
602 | ||
603 | /* Find qdisc */ | |
604 | if (!parent) { | |
af356afa | 605 | q = dev->qdisc; |
1da177e4 | 606 | parent = q->handle; |
aa767bfe SH |
607 | } else { |
608 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
609 | if (q == NULL) | |
610 | return -EINVAL; | |
611 | } | |
1da177e4 LT |
612 | |
613 | /* Is it classful? */ | |
cc7ec456 ED |
614 | cops = q->ops->cl_ops; |
615 | if (!cops) | |
1da177e4 LT |
616 | return -EINVAL; |
617 | ||
6529eaba | 618 | if (!cops->tcf_block) |
71ebe5e9 PM |
619 | return -EOPNOTSUPP; |
620 | ||
1da177e4 LT |
621 | /* Do we search for filter, attached to class? */ |
622 | if (TC_H_MIN(parent)) { | |
143976ce | 623 | cl = cops->find(q, parent); |
1da177e4 LT |
624 | if (cl == 0) |
625 | return -ENOENT; | |
626 | } | |
627 | ||
628 | /* And the last stroke */ | |
6529eaba JP |
629 | block = cops->tcf_block(q, cl); |
630 | if (!block) { | |
6bb16e7a | 631 | err = -EINVAL; |
1da177e4 | 632 | goto errout; |
6bb16e7a | 633 | } |
5bc17018 JP |
634 | |
635 | chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0; | |
636 | if (chain_index > TC_ACT_EXT_VAL_MASK) { | |
637 | err = -EINVAL; | |
638 | goto errout; | |
639 | } | |
367a8ce8 WC |
640 | chain = tcf_chain_get(block, chain_index, |
641 | n->nlmsg_type == RTM_NEWTFILTER); | |
5bc17018 | 642 | if (!chain) { |
367a8ce8 | 643 | err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL; |
5bc17018 JP |
644 | goto errout; |
645 | } | |
6529eaba | 646 | |
ea7f8277 DB |
647 | if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) { |
648 | tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER); | |
f93e1cdc | 649 | tcf_chain_flush(chain); |
ea7f8277 DB |
650 | err = 0; |
651 | goto errout; | |
652 | } | |
1da177e4 | 653 | |
2190d1d0 JP |
654 | tp = tcf_chain_tp_find(chain, &chain_info, protocol, |
655 | prio, prio_allocate); | |
656 | if (IS_ERR(tp)) { | |
657 | err = PTR_ERR(tp); | |
658 | goto errout; | |
1da177e4 LT |
659 | } |
660 | ||
661 | if (tp == NULL) { | |
662 | /* Proto-tcf does not exist, create new one */ | |
663 | ||
6bb16e7a JP |
664 | if (tca[TCA_KIND] == NULL || !protocol) { |
665 | err = -EINVAL; | |
1da177e4 | 666 | goto errout; |
6bb16e7a | 667 | } |
1da177e4 | 668 | |
cc7ec456 | 669 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
670 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
671 | err = -ENOENT; | |
1da177e4 | 672 | goto errout; |
6bb16e7a | 673 | } |
1da177e4 | 674 | |
9d36d9e5 | 675 | if (prio_allocate) |
2190d1d0 | 676 | prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info)); |
1da177e4 | 677 | |
33a48927 | 678 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
5bc17018 | 679 | protocol, prio, parent, q, chain); |
33a48927 JP |
680 | if (IS_ERR(tp)) { |
681 | err = PTR_ERR(tp); | |
1da177e4 LT |
682 | goto errout; |
683 | } | |
12186be7 | 684 | tp_created = 1; |
6bb16e7a JP |
685 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
686 | err = -EINVAL; | |
1da177e4 | 687 | goto errout; |
6bb16e7a | 688 | } |
1da177e4 LT |
689 | |
690 | fh = tp->ops->get(tp, t->tcm_handle); | |
691 | ||
8113c095 | 692 | if (!fh) { |
1da177e4 | 693 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { |
2190d1d0 | 694 | tcf_chain_tp_remove(chain, &chain_info, tp); |
fa59b27c ED |
695 | tfilter_notify(net, skb, n, tp, fh, |
696 | RTM_DELTFILTER, false); | |
763dbf63 | 697 | tcf_proto_destroy(tp); |
1da177e4 LT |
698 | err = 0; |
699 | goto errout; | |
700 | } | |
701 | ||
aa767bfe | 702 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
703 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
704 | err = -ENOENT; | |
1da177e4 | 705 | goto errout; |
6bb16e7a | 706 | } |
1da177e4 | 707 | } else { |
763dbf63 WC |
708 | bool last; |
709 | ||
1da177e4 | 710 | switch (n->nlmsg_type) { |
10297b99 | 711 | case RTM_NEWTFILTER: |
12186be7 MU |
712 | if (n->nlmsg_flags & NLM_F_EXCL) { |
713 | if (tp_created) | |
763dbf63 | 714 | tcf_proto_destroy(tp); |
6bb16e7a | 715 | err = -EEXIST; |
1da177e4 | 716 | goto errout; |
12186be7 | 717 | } |
1da177e4 LT |
718 | break; |
719 | case RTM_DELTFILTER: | |
54df2cf8 WC |
720 | err = tfilter_del_notify(net, skb, n, tp, fh, false, |
721 | &last); | |
40c81b25 JP |
722 | if (err) |
723 | goto errout; | |
763dbf63 | 724 | if (last) { |
2190d1d0 | 725 | tcf_chain_tp_remove(chain, &chain_info, tp); |
763dbf63 WC |
726 | tcf_proto_destroy(tp); |
727 | } | |
d7cf52c2 | 728 | goto errout; |
1da177e4 | 729 | case RTM_GETTFILTER: |
5a7a5555 | 730 | err = tfilter_notify(net, skb, n, tp, fh, |
fa59b27c | 731 | RTM_NEWTFILTER, true); |
1da177e4 LT |
732 | goto errout; |
733 | default: | |
734 | err = -EINVAL; | |
735 | goto errout; | |
736 | } | |
737 | } | |
738 | ||
2f7ef2f8 CW |
739 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
740 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); | |
12186be7 | 741 | if (err == 0) { |
2190d1d0 JP |
742 | if (tp_created) |
743 | tcf_chain_tp_insert(chain, &chain_info, tp); | |
fa59b27c | 744 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false); |
12186be7 MU |
745 | } else { |
746 | if (tp_created) | |
763dbf63 | 747 | tcf_proto_destroy(tp); |
12186be7 | 748 | } |
1da177e4 LT |
749 | |
750 | errout: | |
5bc17018 JP |
751 | if (chain) |
752 | tcf_chain_put(chain); | |
1da177e4 LT |
753 | if (err == -EAGAIN) |
754 | /* Replay the request. */ | |
755 | goto replay; | |
756 | return err; | |
757 | } | |
758 | ||
aa767bfe | 759 | struct tcf_dump_args { |
1da177e4 LT |
760 | struct tcf_walker w; |
761 | struct sk_buff *skb; | |
762 | struct netlink_callback *cb; | |
763 | }; | |
764 | ||
8113c095 | 765 | static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg) |
1da177e4 | 766 | { |
aa767bfe | 767 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 768 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 769 | |
832d1d5b | 770 | return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
771 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
772 | RTM_NEWTFILTER); | |
1da177e4 LT |
773 | } |
774 | ||
5bc17018 | 775 | static bool tcf_chain_dump(struct tcf_chain *chain, struct sk_buff *skb, |
acb31fae JP |
776 | struct netlink_callback *cb, |
777 | long index_start, long *p_index) | |
778 | { | |
779 | struct net *net = sock_net(skb->sk); | |
780 | struct tcmsg *tcm = nlmsg_data(cb->nlh); | |
781 | struct tcf_dump_args arg; | |
782 | struct tcf_proto *tp; | |
783 | ||
784 | for (tp = rtnl_dereference(chain->filter_chain); | |
785 | tp; tp = rtnl_dereference(tp->next), (*p_index)++) { | |
786 | if (*p_index < index_start) | |
787 | continue; | |
788 | if (TC_H_MAJ(tcm->tcm_info) && | |
789 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
790 | continue; | |
791 | if (TC_H_MIN(tcm->tcm_info) && | |
792 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
793 | continue; | |
794 | if (*p_index > index_start) | |
795 | memset(&cb->args[1], 0, | |
796 | sizeof(cb->args) - sizeof(cb->args[0])); | |
797 | if (cb->args[1] == 0) { | |
798 | if (tcf_fill_node(net, skb, tp, 0, | |
799 | NETLINK_CB(cb->skb).portid, | |
800 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
801 | RTM_NEWTFILTER) <= 0) | |
5bc17018 | 802 | return false; |
acb31fae JP |
803 | |
804 | cb->args[1] = 1; | |
805 | } | |
806 | if (!tp->ops->walk) | |
807 | continue; | |
808 | arg.w.fn = tcf_node_dump; | |
809 | arg.skb = skb; | |
810 | arg.cb = cb; | |
811 | arg.w.stop = 0; | |
812 | arg.w.skip = cb->args[1] - 1; | |
813 | arg.w.count = 0; | |
814 | tp->ops->walk(tp, &arg.w); | |
815 | cb->args[1] = arg.w.count + 1; | |
816 | if (arg.w.stop) | |
5bc17018 | 817 | return false; |
acb31fae | 818 | } |
5bc17018 | 819 | return true; |
acb31fae JP |
820 | } |
821 | ||
bd27a875 | 822 | /* called with RTNL */ |
1da177e4 LT |
823 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
824 | { | |
3b1e0a65 | 825 | struct net *net = sock_net(skb->sk); |
5bc17018 | 826 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
827 | struct net_device *dev; |
828 | struct Qdisc *q; | |
6529eaba | 829 | struct tcf_block *block; |
2190d1d0 | 830 | struct tcf_chain *chain; |
942b8165 | 831 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 832 | unsigned long cl = 0; |
20fea08b | 833 | const struct Qdisc_class_ops *cops; |
acb31fae JP |
834 | long index_start; |
835 | long index; | |
5bc17018 | 836 | int err; |
1da177e4 | 837 | |
573ce260 | 838 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 839 | return skb->len; |
5bc17018 JP |
840 | |
841 | err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); | |
842 | if (err) | |
843 | return err; | |
844 | ||
cc7ec456 ED |
845 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
846 | if (!dev) | |
1da177e4 LT |
847 | return skb->len; |
848 | ||
1da177e4 | 849 | if (!tcm->tcm_parent) |
af356afa | 850 | q = dev->qdisc; |
1da177e4 LT |
851 | else |
852 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
853 | if (!q) | |
854 | goto out; | |
cc7ec456 ED |
855 | cops = q->ops->cl_ops; |
856 | if (!cops) | |
143976ce | 857 | goto out; |
6529eaba | 858 | if (!cops->tcf_block) |
143976ce | 859 | goto out; |
1da177e4 | 860 | if (TC_H_MIN(tcm->tcm_parent)) { |
143976ce | 861 | cl = cops->find(q, tcm->tcm_parent); |
1da177e4 | 862 | if (cl == 0) |
143976ce | 863 | goto out; |
1da177e4 | 864 | } |
6529eaba JP |
865 | block = cops->tcf_block(q, cl); |
866 | if (!block) | |
143976ce | 867 | goto out; |
1da177e4 | 868 | |
acb31fae JP |
869 | index_start = cb->args[0]; |
870 | index = 0; | |
5bc17018 JP |
871 | |
872 | list_for_each_entry(chain, &block->chain_list, list) { | |
873 | if (tca[TCA_CHAIN] && | |
874 | nla_get_u32(tca[TCA_CHAIN]) != chain->index) | |
875 | continue; | |
876 | if (!tcf_chain_dump(chain, skb, cb, index_start, &index)) | |
877 | break; | |
878 | } | |
879 | ||
acb31fae | 880 | cb->args[0] = index; |
1da177e4 | 881 | |
1da177e4 | 882 | out: |
1da177e4 LT |
883 | return skb->len; |
884 | } | |
885 | ||
18d0264f | 886 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
887 | { |
888 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
889 | LIST_HEAD(actions); |
890 | ||
2d132eba | 891 | ASSERT_RTNL(); |
22dc13c8 WC |
892 | tcf_exts_to_list(exts, &actions); |
893 | tcf_action_destroy(&actions, TCA_ACT_UNBIND); | |
894 | kfree(exts->actions); | |
895 | exts->nr_actions = 0; | |
1da177e4 LT |
896 | #endif |
897 | } | |
aa767bfe | 898 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 899 | |
c1b52739 | 900 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
5a7a5555 | 901 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) |
1da177e4 | 902 | { |
1da177e4 LT |
903 | #ifdef CONFIG_NET_CLS_ACT |
904 | { | |
1da177e4 LT |
905 | struct tc_action *act; |
906 | ||
5da57f42 | 907 | if (exts->police && tb[exts->police]) { |
9fb9f251 JP |
908 | act = tcf_action_init_1(net, tp, tb[exts->police], |
909 | rate_tlv, "police", ovr, | |
910 | TCA_ACT_BIND); | |
ab27cfb8 PM |
911 | if (IS_ERR(act)) |
912 | return PTR_ERR(act); | |
1da177e4 | 913 | |
33be6271 | 914 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
915 | exts->actions[0] = act; |
916 | exts->nr_actions = 1; | |
5da57f42 | 917 | } else if (exts->action && tb[exts->action]) { |
22dc13c8 WC |
918 | LIST_HEAD(actions); |
919 | int err, i = 0; | |
920 | ||
9fb9f251 JP |
921 | err = tcf_action_init(net, tp, tb[exts->action], |
922 | rate_tlv, NULL, ovr, TCA_ACT_BIND, | |
5a7a5555 | 923 | &actions); |
33be6271 WC |
924 | if (err) |
925 | return err; | |
22dc13c8 WC |
926 | list_for_each_entry(act, &actions, list) |
927 | exts->actions[i++] = act; | |
928 | exts->nr_actions = i; | |
1da177e4 LT |
929 | } |
930 | } | |
1da177e4 | 931 | #else |
5da57f42 WC |
932 | if ((exts->action && tb[exts->action]) || |
933 | (exts->police && tb[exts->police])) | |
1da177e4 LT |
934 | return -EOPNOTSUPP; |
935 | #endif | |
936 | ||
937 | return 0; | |
938 | } | |
aa767bfe | 939 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 940 | |
9b0d4446 | 941 | void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src) |
1da177e4 LT |
942 | { |
943 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
944 | struct tcf_exts old = *dst; |
945 | ||
9b0d4446 | 946 | *dst = *src; |
22dc13c8 | 947 | tcf_exts_destroy(&old); |
1da177e4 LT |
948 | #endif |
949 | } | |
aa767bfe | 950 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 951 | |
22dc13c8 WC |
952 | #ifdef CONFIG_NET_CLS_ACT |
953 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
954 | { | |
955 | if (exts->nr_actions == 0) | |
956 | return NULL; | |
957 | else | |
958 | return exts->actions[0]; | |
959 | } | |
960 | #endif | |
33be6271 | 961 | |
5da57f42 | 962 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
963 | { |
964 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
965 | struct nlattr *nest; |
966 | ||
978dfd8d | 967 | if (exts->action && tcf_exts_has_actions(exts)) { |
1da177e4 LT |
968 | /* |
969 | * again for backward compatible mode - we want | |
970 | * to work with both old and new modes of entering | |
971 | * tc data even if iproute2 was newer - jhs | |
972 | */ | |
33be6271 | 973 | if (exts->type != TCA_OLD_COMPAT) { |
22dc13c8 WC |
974 | LIST_HEAD(actions); |
975 | ||
5da57f42 | 976 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
977 | if (nest == NULL) |
978 | goto nla_put_failure; | |
22dc13c8 WC |
979 | |
980 | tcf_exts_to_list(exts, &actions); | |
981 | if (tcf_action_dump(skb, &actions, 0, 0) < 0) | |
add93b61 | 982 | goto nla_put_failure; |
4b3550ef | 983 | nla_nest_end(skb, nest); |
5da57f42 | 984 | } else if (exts->police) { |
33be6271 | 985 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 986 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 987 | if (nest == NULL || !act) |
4b3550ef | 988 | goto nla_put_failure; |
33be6271 | 989 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 990 | goto nla_put_failure; |
4b3550ef | 991 | nla_nest_end(skb, nest); |
1da177e4 LT |
992 | } |
993 | } | |
1da177e4 | 994 | return 0; |
9cc63db5 CW |
995 | |
996 | nla_put_failure: | |
997 | nla_nest_cancel(skb, nest); | |
1da177e4 | 998 | return -1; |
9cc63db5 CW |
999 | #else |
1000 | return 0; | |
1001 | #endif | |
1da177e4 | 1002 | } |
aa767bfe | 1003 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 1004 | |
aa767bfe | 1005 | |
5da57f42 | 1006 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
1007 | { |
1008 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 1009 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 1010 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 1011 | return -1; |
1da177e4 LT |
1012 | #endif |
1013 | return 0; | |
1da177e4 | 1014 | } |
aa767bfe | 1015 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 1016 | |
7091d8c7 HHZ |
1017 | int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts, |
1018 | struct net_device **hw_dev) | |
1019 | { | |
1020 | #ifdef CONFIG_NET_CLS_ACT | |
1021 | const struct tc_action *a; | |
1022 | LIST_HEAD(actions); | |
1023 | ||
3bcc0cec | 1024 | if (!tcf_exts_has_actions(exts)) |
7091d8c7 HHZ |
1025 | return -EINVAL; |
1026 | ||
1027 | tcf_exts_to_list(exts, &actions); | |
1028 | list_for_each_entry(a, &actions, list) { | |
1029 | if (a->ops->get_dev) { | |
1030 | a->ops->get_dev(a, dev_net(dev), hw_dev); | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | if (*hw_dev) | |
1035 | return 0; | |
1036 | #endif | |
1037 | return -EOPNOTSUPP; | |
1038 | } | |
1039 | EXPORT_SYMBOL(tcf_exts_get_dev); | |
1040 | ||
1da177e4 LT |
1041 | static int __init tc_filter_init(void) |
1042 | { | |
7aa0045d CW |
1043 | tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0); |
1044 | if (!tc_filter_wq) | |
1045 | return -ENOMEM; | |
1046 | ||
b97bac64 FW |
1047 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0); |
1048 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0); | |
82623c0d | 1049 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
b97bac64 | 1050 | tc_dump_tfilter, 0); |
1da177e4 | 1051 | |
1da177e4 LT |
1052 | return 0; |
1053 | } | |
1054 | ||
1055 | subsys_initcall(tc_filter_init); |