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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 | |
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 | |
ea7f8277 DB |
107 | static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb, |
108 | struct nlmsghdr *n, | |
109 | struct tcf_proto __rcu **chain, int event) | |
110 | { | |
111 | struct tcf_proto __rcu **it_chain; | |
112 | struct tcf_proto *tp; | |
113 | ||
114 | for (it_chain = chain; (tp = rtnl_dereference(*it_chain)) != NULL; | |
115 | it_chain = &tp->next) | |
19a8bb28 | 116 | tfilter_notify(net, oskb, n, tp, 0, event, false); |
ea7f8277 | 117 | } |
1da177e4 LT |
118 | |
119 | /* Select new prio value from the range, managed by kernel. */ | |
120 | ||
aa767bfe | 121 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 122 | { |
aa767bfe | 123 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
124 | |
125 | if (tp) | |
cc7ec456 | 126 | first = tp->prio - 1; |
1da177e4 LT |
127 | |
128 | return first; | |
129 | } | |
130 | ||
33a48927 | 131 | static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol, |
6529eaba JP |
132 | u32 prio, u32 parent, struct Qdisc *q, |
133 | struct tcf_block *block) | |
33a48927 JP |
134 | { |
135 | struct tcf_proto *tp; | |
136 | int err; | |
137 | ||
138 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
139 | if (!tp) | |
140 | return ERR_PTR(-ENOBUFS); | |
141 | ||
142 | err = -ENOENT; | |
143 | tp->ops = tcf_proto_lookup_ops(kind); | |
144 | if (!tp->ops) { | |
145 | #ifdef CONFIG_MODULES | |
146 | rtnl_unlock(); | |
147 | request_module("cls_%s", kind); | |
148 | rtnl_lock(); | |
149 | tp->ops = tcf_proto_lookup_ops(kind); | |
150 | /* We dropped the RTNL semaphore in order to perform | |
151 | * the module load. So, even if we succeeded in loading | |
152 | * the module we have to replay the request. We indicate | |
153 | * this using -EAGAIN. | |
154 | */ | |
155 | if (tp->ops) { | |
156 | module_put(tp->ops->owner); | |
157 | err = -EAGAIN; | |
158 | } else { | |
159 | err = -ENOENT; | |
160 | } | |
161 | goto errout; | |
162 | #endif | |
163 | } | |
164 | tp->classify = tp->ops->classify; | |
165 | tp->protocol = protocol; | |
166 | tp->prio = prio; | |
167 | tp->classid = parent; | |
168 | tp->q = q; | |
6529eaba | 169 | tp->block = block; |
33a48927 JP |
170 | |
171 | err = tp->ops->init(tp); | |
172 | if (err) { | |
173 | module_put(tp->ops->owner); | |
174 | goto errout; | |
175 | } | |
176 | return tp; | |
177 | ||
178 | errout: | |
179 | kfree(tp); | |
180 | return ERR_PTR(err); | |
181 | } | |
182 | ||
763dbf63 | 183 | static void tcf_proto_destroy(struct tcf_proto *tp) |
cf1facda | 184 | { |
763dbf63 WC |
185 | tp->ops->destroy(tp); |
186 | module_put(tp->ops->owner); | |
187 | kfree_rcu(tp, rcu); | |
cf1facda JP |
188 | } |
189 | ||
6529eaba | 190 | static void tcf_destroy_chain(struct tcf_proto __rcu **fl) |
cf1facda JP |
191 | { |
192 | struct tcf_proto *tp; | |
193 | ||
194 | while ((tp = rtnl_dereference(*fl)) != NULL) { | |
195 | RCU_INIT_POINTER(*fl, tp->next); | |
763dbf63 | 196 | tcf_proto_destroy(tp); |
cf1facda JP |
197 | } |
198 | } | |
6529eaba JP |
199 | |
200 | int tcf_block_get(struct tcf_block **p_block, | |
201 | struct tcf_proto __rcu **p_filter_chain) | |
202 | { | |
203 | struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL); | |
204 | ||
205 | if (!block) | |
206 | return -ENOMEM; | |
207 | block->p_filter_chain = p_filter_chain; | |
208 | *p_block = block; | |
209 | return 0; | |
210 | } | |
211 | EXPORT_SYMBOL(tcf_block_get); | |
212 | ||
213 | void tcf_block_put(struct tcf_block *block) | |
214 | { | |
215 | if (!block) | |
216 | return; | |
217 | tcf_destroy_chain(block->p_filter_chain); | |
218 | kfree(block); | |
219 | } | |
220 | EXPORT_SYMBOL(tcf_block_put); | |
cf1facda | 221 | |
87d83093 JP |
222 | /* Main classifier routine: scans classifier chain attached |
223 | * to this qdisc, (optionally) tests for protocol and asks | |
224 | * specific classifiers. | |
225 | */ | |
226 | int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
227 | struct tcf_result *res, bool compat_mode) | |
228 | { | |
229 | __be16 protocol = tc_skb_protocol(skb); | |
230 | #ifdef CONFIG_NET_CLS_ACT | |
231 | const int max_reclassify_loop = 4; | |
232 | const struct tcf_proto *old_tp = tp; | |
233 | int limit = 0; | |
234 | ||
235 | reclassify: | |
236 | #endif | |
237 | for (; tp; tp = rcu_dereference_bh(tp->next)) { | |
238 | int err; | |
239 | ||
240 | if (tp->protocol != protocol && | |
241 | tp->protocol != htons(ETH_P_ALL)) | |
242 | continue; | |
243 | ||
244 | err = tp->classify(skb, tp, res); | |
245 | #ifdef CONFIG_NET_CLS_ACT | |
246 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) | |
247 | goto reset; | |
248 | #endif | |
249 | if (err >= 0) | |
250 | return err; | |
251 | } | |
252 | ||
253 | return TC_ACT_UNSPEC; /* signal: continue lookup */ | |
254 | #ifdef CONFIG_NET_CLS_ACT | |
255 | reset: | |
256 | if (unlikely(limit++ >= max_reclassify_loop)) { | |
257 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", | |
258 | tp->q->ops->id, tp->prio & 0xffff, | |
259 | ntohs(tp->protocol)); | |
260 | return TC_ACT_SHOT; | |
261 | } | |
262 | ||
263 | tp = old_tp; | |
264 | protocol = tc_skb_protocol(skb); | |
265 | goto reclassify; | |
266 | #endif | |
267 | } | |
268 | EXPORT_SYMBOL(tcf_classify); | |
269 | ||
1da177e4 LT |
270 | /* Add/change/delete/get a filter node */ |
271 | ||
c21ef3e3 DA |
272 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, |
273 | struct netlink_ext_ack *extack) | |
1da177e4 | 274 | { |
3b1e0a65 | 275 | struct net *net = sock_net(skb->sk); |
add93b61 | 276 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
277 | struct tcmsg *t; |
278 | u32 protocol; | |
279 | u32 prio; | |
280 | u32 nprio; | |
281 | u32 parent; | |
282 | struct net_device *dev; | |
283 | struct Qdisc *q; | |
25d8c0d5 JF |
284 | struct tcf_proto __rcu **back; |
285 | struct tcf_proto __rcu **chain; | |
6529eaba | 286 | struct tcf_block *block; |
40c81b25 | 287 | struct tcf_proto *next; |
1da177e4 | 288 | struct tcf_proto *tp; |
20fea08b | 289 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
290 | unsigned long cl; |
291 | unsigned long fh; | |
292 | int err; | |
628185cf | 293 | int tp_created; |
1da177e4 | 294 | |
4e8bbb81 | 295 | if ((n->nlmsg_type != RTM_GETTFILTER) && |
5f013c9b | 296 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 297 | return -EPERM; |
de179c8c | 298 | |
1da177e4 | 299 | replay: |
628185cf DB |
300 | tp_created = 0; |
301 | ||
c21ef3e3 | 302 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack); |
de179c8c H |
303 | if (err < 0) |
304 | return err; | |
305 | ||
942b8165 | 306 | t = nlmsg_data(n); |
1da177e4 LT |
307 | protocol = TC_H_MIN(t->tcm_info); |
308 | prio = TC_H_MAJ(t->tcm_info); | |
309 | nprio = prio; | |
310 | parent = t->tcm_parent; | |
311 | cl = 0; | |
312 | ||
313 | if (prio == 0) { | |
ea7f8277 DB |
314 | switch (n->nlmsg_type) { |
315 | case RTM_DELTFILTER: | |
9f6ed032 | 316 | if (protocol || t->tcm_handle || tca[TCA_KIND]) |
ea7f8277 DB |
317 | return -ENOENT; |
318 | break; | |
319 | case RTM_NEWTFILTER: | |
320 | /* If no priority is provided by the user, | |
321 | * we allocate one. | |
322 | */ | |
323 | if (n->nlmsg_flags & NLM_F_CREATE) { | |
324 | prio = TC_H_MAKE(0x80000000U, 0U); | |
325 | break; | |
326 | } | |
327 | /* fall-through */ | |
328 | default: | |
1da177e4 | 329 | return -ENOENT; |
ea7f8277 | 330 | } |
1da177e4 LT |
331 | } |
332 | ||
333 | /* Find head of filter chain. */ | |
334 | ||
335 | /* Find link */ | |
7316ae88 | 336 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 337 | if (dev == NULL) |
1da177e4 LT |
338 | return -ENODEV; |
339 | ||
340 | /* Find qdisc */ | |
341 | if (!parent) { | |
af356afa | 342 | q = dev->qdisc; |
1da177e4 | 343 | parent = q->handle; |
aa767bfe SH |
344 | } else { |
345 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
346 | if (q == NULL) | |
347 | return -EINVAL; | |
348 | } | |
1da177e4 LT |
349 | |
350 | /* Is it classful? */ | |
cc7ec456 ED |
351 | cops = q->ops->cl_ops; |
352 | if (!cops) | |
1da177e4 LT |
353 | return -EINVAL; |
354 | ||
6529eaba | 355 | if (!cops->tcf_block) |
71ebe5e9 PM |
356 | return -EOPNOTSUPP; |
357 | ||
1da177e4 LT |
358 | /* Do we search for filter, attached to class? */ |
359 | if (TC_H_MIN(parent)) { | |
360 | cl = cops->get(q, parent); | |
361 | if (cl == 0) | |
362 | return -ENOENT; | |
363 | } | |
364 | ||
365 | /* And the last stroke */ | |
6529eaba JP |
366 | block = cops->tcf_block(q, cl); |
367 | if (!block) { | |
6bb16e7a | 368 | err = -EINVAL; |
1da177e4 | 369 | goto errout; |
6bb16e7a | 370 | } |
6529eaba JP |
371 | chain = block->p_filter_chain; |
372 | ||
ea7f8277 DB |
373 | if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) { |
374 | tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER); | |
375 | tcf_destroy_chain(chain); | |
376 | err = 0; | |
377 | goto errout; | |
378 | } | |
1da177e4 LT |
379 | |
380 | /* Check the chain for existence of proto-tcf with this priority */ | |
25d8c0d5 JF |
381 | for (back = chain; |
382 | (tp = rtnl_dereference(*back)) != NULL; | |
383 | back = &tp->next) { | |
1da177e4 LT |
384 | if (tp->prio >= prio) { |
385 | if (tp->prio == prio) { | |
cc7ec456 | 386 | if (!nprio || |
6bb16e7a JP |
387 | (tp->protocol != protocol && protocol)) { |
388 | err = -EINVAL; | |
1da177e4 | 389 | goto errout; |
6bb16e7a | 390 | } |
7215032c | 391 | } else { |
1da177e4 | 392 | tp = NULL; |
7215032c | 393 | } |
1da177e4 LT |
394 | break; |
395 | } | |
396 | } | |
397 | ||
398 | if (tp == NULL) { | |
399 | /* Proto-tcf does not exist, create new one */ | |
400 | ||
6bb16e7a JP |
401 | if (tca[TCA_KIND] == NULL || !protocol) { |
402 | err = -EINVAL; | |
1da177e4 | 403 | goto errout; |
6bb16e7a | 404 | } |
1da177e4 | 405 | |
cc7ec456 | 406 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
407 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
408 | err = -ENOENT; | |
1da177e4 | 409 | goto errout; |
6bb16e7a | 410 | } |
1da177e4 | 411 | |
33a48927 JP |
412 | if (!nprio) |
413 | nprio = TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back))); | |
1da177e4 | 414 | |
33a48927 | 415 | tp = tcf_proto_create(nla_data(tca[TCA_KIND]), |
6529eaba | 416 | protocol, nprio, parent, q, block); |
33a48927 JP |
417 | if (IS_ERR(tp)) { |
418 | err = PTR_ERR(tp); | |
1da177e4 LT |
419 | goto errout; |
420 | } | |
12186be7 | 421 | tp_created = 1; |
6bb16e7a JP |
422 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) { |
423 | err = -EINVAL; | |
1da177e4 | 424 | goto errout; |
6bb16e7a | 425 | } |
1da177e4 LT |
426 | |
427 | fh = tp->ops->get(tp, t->tcm_handle); | |
428 | ||
429 | if (fh == 0) { | |
430 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
40c81b25 | 431 | next = rtnl_dereference(tp->next); |
25d8c0d5 | 432 | RCU_INIT_POINTER(*back, next); |
fa59b27c ED |
433 | tfilter_notify(net, skb, n, tp, fh, |
434 | RTM_DELTFILTER, false); | |
763dbf63 | 435 | tcf_proto_destroy(tp); |
1da177e4 LT |
436 | err = 0; |
437 | goto errout; | |
438 | } | |
439 | ||
aa767bfe | 440 | if (n->nlmsg_type != RTM_NEWTFILTER || |
6bb16e7a JP |
441 | !(n->nlmsg_flags & NLM_F_CREATE)) { |
442 | err = -ENOENT; | |
1da177e4 | 443 | goto errout; |
6bb16e7a | 444 | } |
1da177e4 | 445 | } else { |
763dbf63 WC |
446 | bool last; |
447 | ||
1da177e4 | 448 | switch (n->nlmsg_type) { |
10297b99 | 449 | case RTM_NEWTFILTER: |
12186be7 MU |
450 | if (n->nlmsg_flags & NLM_F_EXCL) { |
451 | if (tp_created) | |
763dbf63 | 452 | tcf_proto_destroy(tp); |
6bb16e7a | 453 | err = -EEXIST; |
1da177e4 | 454 | goto errout; |
12186be7 | 455 | } |
1da177e4 LT |
456 | break; |
457 | case RTM_DELTFILTER: | |
763dbf63 | 458 | err = tp->ops->delete(tp, fh, &last); |
40c81b25 JP |
459 | if (err) |
460 | goto errout; | |
461 | next = rtnl_dereference(tp->next); | |
462 | tfilter_notify(net, skb, n, tp, t->tcm_handle, | |
463 | RTM_DELTFILTER, false); | |
763dbf63 | 464 | if (last) { |
40c81b25 | 465 | RCU_INIT_POINTER(*back, next); |
763dbf63 WC |
466 | tcf_proto_destroy(tp); |
467 | } | |
d7cf52c2 | 468 | goto errout; |
1da177e4 | 469 | case RTM_GETTFILTER: |
5a7a5555 | 470 | err = tfilter_notify(net, skb, n, tp, fh, |
fa59b27c | 471 | RTM_NEWTFILTER, true); |
1da177e4 LT |
472 | goto errout; |
473 | default: | |
474 | err = -EINVAL; | |
475 | goto errout; | |
476 | } | |
477 | } | |
478 | ||
2f7ef2f8 CW |
479 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
480 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); | |
12186be7 MU |
481 | if (err == 0) { |
482 | if (tp_created) { | |
25d8c0d5 JF |
483 | RCU_INIT_POINTER(tp->next, rtnl_dereference(*back)); |
484 | rcu_assign_pointer(*back, tp); | |
12186be7 | 485 | } |
fa59b27c | 486 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false); |
12186be7 MU |
487 | } else { |
488 | if (tp_created) | |
763dbf63 | 489 | tcf_proto_destroy(tp); |
12186be7 | 490 | } |
1da177e4 LT |
491 | |
492 | errout: | |
493 | if (cl) | |
494 | cops->put(q, cl); | |
495 | if (err == -EAGAIN) | |
496 | /* Replay the request. */ | |
497 | goto replay; | |
498 | return err; | |
499 | } | |
500 | ||
0b0f43fe JHS |
501 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, |
502 | struct tcf_proto *tp, unsigned long fh, u32 portid, | |
503 | u32 seq, u16 flags, int event) | |
1da177e4 LT |
504 | { |
505 | struct tcmsg *tcm; | |
506 | struct nlmsghdr *nlh; | |
27a884dc | 507 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 508 | |
15e47304 | 509 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
510 | if (!nlh) |
511 | goto out_nlmsg_trim; | |
512 | tcm = nlmsg_data(nlh); | |
1da177e4 | 513 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 514 | tcm->tcm__pad1 = 0; |
ad61df91 | 515 | tcm->tcm__pad2 = 0; |
5ce2d488 | 516 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
517 | tcm->tcm_parent = tp->classid; |
518 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
519 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
520 | goto nla_put_failure; | |
1da177e4 LT |
521 | tcm->tcm_handle = fh; |
522 | if (RTM_DELTFILTER != event) { | |
523 | tcm->tcm_handle = 0; | |
832d1d5b | 524 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) |
add93b61 | 525 | goto nla_put_failure; |
1da177e4 | 526 | } |
27a884dc | 527 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
528 | return skb->len; |
529 | ||
942b8165 | 530 | out_nlmsg_trim: |
add93b61 | 531 | nla_put_failure: |
dc5fc579 | 532 | nlmsg_trim(skb, b); |
1da177e4 LT |
533 | return -1; |
534 | } | |
535 | ||
7316ae88 TG |
536 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
537 | struct nlmsghdr *n, struct tcf_proto *tp, | |
fa59b27c | 538 | unsigned long fh, int event, bool unicast) |
1da177e4 LT |
539 | { |
540 | struct sk_buff *skb; | |
15e47304 | 541 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
542 | |
543 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
544 | if (!skb) | |
545 | return -ENOBUFS; | |
546 | ||
30a391a1 RM |
547 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, |
548 | n->nlmsg_flags, event) <= 0) { | |
1da177e4 LT |
549 | kfree_skb(skb); |
550 | return -EINVAL; | |
551 | } | |
552 | ||
fa59b27c ED |
553 | if (unicast) |
554 | return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT); | |
555 | ||
15e47304 | 556 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 557 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
558 | } |
559 | ||
aa767bfe | 560 | struct tcf_dump_args { |
1da177e4 LT |
561 | struct tcf_walker w; |
562 | struct sk_buff *skb; | |
563 | struct netlink_callback *cb; | |
564 | }; | |
565 | ||
aa767bfe SH |
566 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
567 | struct tcf_walker *arg) | |
1da177e4 | 568 | { |
aa767bfe | 569 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 570 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 571 | |
832d1d5b | 572 | return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
573 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
574 | RTM_NEWTFILTER); | |
1da177e4 LT |
575 | } |
576 | ||
bd27a875 | 577 | /* called with RTNL */ |
1da177e4 LT |
578 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
579 | { | |
3b1e0a65 | 580 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
581 | int t; |
582 | int s_t; | |
583 | struct net_device *dev; | |
584 | struct Qdisc *q; | |
6529eaba | 585 | struct tcf_block *block; |
25d8c0d5 | 586 | struct tcf_proto *tp, __rcu **chain; |
942b8165 | 587 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 588 | unsigned long cl = 0; |
20fea08b | 589 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
590 | struct tcf_dump_args arg; |
591 | ||
573ce260 | 592 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 593 | return skb->len; |
cc7ec456 ED |
594 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
595 | if (!dev) | |
1da177e4 LT |
596 | return skb->len; |
597 | ||
1da177e4 | 598 | if (!tcm->tcm_parent) |
af356afa | 599 | q = dev->qdisc; |
1da177e4 LT |
600 | else |
601 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
602 | if (!q) | |
603 | goto out; | |
cc7ec456 ED |
604 | cops = q->ops->cl_ops; |
605 | if (!cops) | |
1da177e4 | 606 | goto errout; |
6529eaba | 607 | if (!cops->tcf_block) |
71ebe5e9 | 608 | goto errout; |
1da177e4 LT |
609 | if (TC_H_MIN(tcm->tcm_parent)) { |
610 | cl = cops->get(q, tcm->tcm_parent); | |
611 | if (cl == 0) | |
612 | goto errout; | |
613 | } | |
6529eaba JP |
614 | block = cops->tcf_block(q, cl); |
615 | if (!block) | |
1da177e4 | 616 | goto errout; |
6529eaba | 617 | chain = block->p_filter_chain; |
1da177e4 LT |
618 | |
619 | s_t = cb->args[0]; | |
620 | ||
25d8c0d5 JF |
621 | for (tp = rtnl_dereference(*chain), t = 0; |
622 | tp; tp = rtnl_dereference(tp->next), t++) { | |
cc7ec456 ED |
623 | if (t < s_t) |
624 | continue; | |
1da177e4 LT |
625 | if (TC_H_MAJ(tcm->tcm_info) && |
626 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
627 | continue; | |
628 | if (TC_H_MIN(tcm->tcm_info) && | |
629 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
630 | continue; | |
631 | if (t > s_t) | |
0b0f43fe JHS |
632 | memset(&cb->args[1], 0, |
633 | sizeof(cb->args)-sizeof(cb->args[0])); | |
1da177e4 | 634 | if (cb->args[1] == 0) { |
0b0f43fe JHS |
635 | if (tcf_fill_node(net, skb, tp, 0, |
636 | NETLINK_CB(cb->skb).portid, | |
aa767bfe SH |
637 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
638 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 639 | break; |
aa767bfe | 640 | |
1da177e4 LT |
641 | cb->args[1] = 1; |
642 | } | |
643 | if (tp->ops->walk == NULL) | |
644 | continue; | |
645 | arg.w.fn = tcf_node_dump; | |
646 | arg.skb = skb; | |
647 | arg.cb = cb; | |
648 | arg.w.stop = 0; | |
cc7ec456 | 649 | arg.w.skip = cb->args[1] - 1; |
1da177e4 LT |
650 | arg.w.count = 0; |
651 | tp->ops->walk(tp, &arg.w); | |
cc7ec456 | 652 | cb->args[1] = arg.w.count + 1; |
1da177e4 LT |
653 | if (arg.w.stop) |
654 | break; | |
655 | } | |
656 | ||
657 | cb->args[0] = t; | |
658 | ||
659 | errout: | |
660 | if (cl) | |
661 | cops->put(q, cl); | |
662 | out: | |
1da177e4 LT |
663 | return skb->len; |
664 | } | |
665 | ||
18d0264f | 666 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
667 | { |
668 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
669 | LIST_HEAD(actions); |
670 | ||
671 | tcf_exts_to_list(exts, &actions); | |
672 | tcf_action_destroy(&actions, TCA_ACT_UNBIND); | |
673 | kfree(exts->actions); | |
674 | exts->nr_actions = 0; | |
1da177e4 LT |
675 | #endif |
676 | } | |
aa767bfe | 677 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 678 | |
c1b52739 | 679 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
5a7a5555 | 680 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) |
1da177e4 | 681 | { |
1da177e4 LT |
682 | #ifdef CONFIG_NET_CLS_ACT |
683 | { | |
1da177e4 LT |
684 | struct tc_action *act; |
685 | ||
5da57f42 WC |
686 | if (exts->police && tb[exts->police]) { |
687 | act = tcf_action_init_1(net, tb[exts->police], rate_tlv, | |
5a7a5555 | 688 | "police", ovr, TCA_ACT_BIND); |
ab27cfb8 PM |
689 | if (IS_ERR(act)) |
690 | return PTR_ERR(act); | |
1da177e4 | 691 | |
33be6271 | 692 | act->type = exts->type = TCA_OLD_COMPAT; |
22dc13c8 WC |
693 | exts->actions[0] = act; |
694 | exts->nr_actions = 1; | |
5da57f42 | 695 | } else if (exts->action && tb[exts->action]) { |
22dc13c8 WC |
696 | LIST_HEAD(actions); |
697 | int err, i = 0; | |
698 | ||
5da57f42 | 699 | err = tcf_action_init(net, tb[exts->action], rate_tlv, |
5a7a5555 JHS |
700 | NULL, ovr, TCA_ACT_BIND, |
701 | &actions); | |
33be6271 WC |
702 | if (err) |
703 | return err; | |
22dc13c8 WC |
704 | list_for_each_entry(act, &actions, list) |
705 | exts->actions[i++] = act; | |
706 | exts->nr_actions = i; | |
1da177e4 LT |
707 | } |
708 | } | |
1da177e4 | 709 | #else |
5da57f42 WC |
710 | if ((exts->action && tb[exts->action]) || |
711 | (exts->police && tb[exts->police])) | |
1da177e4 LT |
712 | return -EOPNOTSUPP; |
713 | #endif | |
714 | ||
715 | return 0; | |
716 | } | |
aa767bfe | 717 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 718 | |
aa767bfe SH |
719 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
720 | struct tcf_exts *src) | |
1da177e4 LT |
721 | { |
722 | #ifdef CONFIG_NET_CLS_ACT | |
22dc13c8 WC |
723 | struct tcf_exts old = *dst; |
724 | ||
a49eb42a | 725 | tcf_tree_lock(tp); |
22dc13c8 WC |
726 | dst->nr_actions = src->nr_actions; |
727 | dst->actions = src->actions; | |
5301e3e1 | 728 | dst->type = src->type; |
a49eb42a | 729 | tcf_tree_unlock(tp); |
22dc13c8 WC |
730 | |
731 | tcf_exts_destroy(&old); | |
1da177e4 LT |
732 | #endif |
733 | } | |
aa767bfe | 734 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 735 | |
22dc13c8 WC |
736 | #ifdef CONFIG_NET_CLS_ACT |
737 | static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts) | |
738 | { | |
739 | if (exts->nr_actions == 0) | |
740 | return NULL; | |
741 | else | |
742 | return exts->actions[0]; | |
743 | } | |
744 | #endif | |
33be6271 | 745 | |
5da57f42 | 746 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
747 | { |
748 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
749 | struct nlattr *nest; |
750 | ||
22dc13c8 | 751 | if (exts->action && exts->nr_actions) { |
1da177e4 LT |
752 | /* |
753 | * again for backward compatible mode - we want | |
754 | * to work with both old and new modes of entering | |
755 | * tc data even if iproute2 was newer - jhs | |
756 | */ | |
33be6271 | 757 | if (exts->type != TCA_OLD_COMPAT) { |
22dc13c8 WC |
758 | LIST_HEAD(actions); |
759 | ||
5da57f42 | 760 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
761 | if (nest == NULL) |
762 | goto nla_put_failure; | |
22dc13c8 WC |
763 | |
764 | tcf_exts_to_list(exts, &actions); | |
765 | if (tcf_action_dump(skb, &actions, 0, 0) < 0) | |
add93b61 | 766 | goto nla_put_failure; |
4b3550ef | 767 | nla_nest_end(skb, nest); |
5da57f42 | 768 | } else if (exts->police) { |
33be6271 | 769 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 770 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 771 | if (nest == NULL || !act) |
4b3550ef | 772 | goto nla_put_failure; |
33be6271 | 773 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 774 | goto nla_put_failure; |
4b3550ef | 775 | nla_nest_end(skb, nest); |
1da177e4 LT |
776 | } |
777 | } | |
1da177e4 | 778 | return 0; |
9cc63db5 CW |
779 | |
780 | nla_put_failure: | |
781 | nla_nest_cancel(skb, nest); | |
1da177e4 | 782 | return -1; |
9cc63db5 CW |
783 | #else |
784 | return 0; | |
785 | #endif | |
1da177e4 | 786 | } |
aa767bfe | 787 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 788 | |
aa767bfe | 789 | |
5da57f42 | 790 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
791 | { |
792 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 | 793 | struct tc_action *a = tcf_exts_first_act(exts); |
b057df24 | 794 | if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0) |
33be6271 | 795 | return -1; |
1da177e4 LT |
796 | #endif |
797 | return 0; | |
1da177e4 | 798 | } |
aa767bfe | 799 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 | 800 | |
7091d8c7 HHZ |
801 | int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts, |
802 | struct net_device **hw_dev) | |
803 | { | |
804 | #ifdef CONFIG_NET_CLS_ACT | |
805 | const struct tc_action *a; | |
806 | LIST_HEAD(actions); | |
807 | ||
808 | if (tc_no_actions(exts)) | |
809 | return -EINVAL; | |
810 | ||
811 | tcf_exts_to_list(exts, &actions); | |
812 | list_for_each_entry(a, &actions, list) { | |
813 | if (a->ops->get_dev) { | |
814 | a->ops->get_dev(a, dev_net(dev), hw_dev); | |
815 | break; | |
816 | } | |
817 | } | |
818 | if (*hw_dev) | |
819 | return 0; | |
820 | #endif | |
821 | return -EOPNOTSUPP; | |
822 | } | |
823 | EXPORT_SYMBOL(tcf_exts_get_dev); | |
824 | ||
1da177e4 LT |
825 | static int __init tc_filter_init(void) |
826 | { | |
c7ac8679 GR |
827 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
828 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 829 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 830 | tc_dump_tfilter, NULL); |
1da177e4 | 831 | |
1da177e4 LT |
832 | return 0; |
833 | } | |
834 | ||
835 | subsys_initcall(tc_filter_init); |