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