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> |
1da177e4 | 22 | #include <linux/skbuff.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/kmod.h> | |
573ce260 | 25 | #include <net/netlink.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 LT |
34 | /* The list of all installed classifier types */ |
35 | ||
2eb9d75c | 36 | static struct tcf_proto_ops *tcf_proto_base __read_mostly; |
1da177e4 LT |
37 | |
38 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
39 | static DEFINE_RWLOCK(cls_mod_lock); | |
40 | ||
41 | /* Find classifier type by string name */ | |
42 | ||
dc7f9f6e | 43 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) |
1da177e4 | 44 | { |
dc7f9f6e | 45 | const struct tcf_proto_ops *t = NULL; |
1da177e4 LT |
46 | |
47 | if (kind) { | |
48 | read_lock(&cls_mod_lock); | |
49 | for (t = tcf_proto_base; t; t = t->next) { | |
add93b61 | 50 | if (nla_strcmp(kind, t->kind) == 0) { |
1da177e4 LT |
51 | if (!try_module_get(t->owner)) |
52 | t = NULL; | |
53 | break; | |
54 | } | |
55 | } | |
56 | read_unlock(&cls_mod_lock); | |
57 | } | |
58 | return t; | |
59 | } | |
60 | ||
61 | /* Register(unregister) new classifier type */ | |
62 | ||
63 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
64 | { | |
65 | struct tcf_proto_ops *t, **tp; | |
66 | int rc = -EEXIST; | |
67 | ||
68 | write_lock(&cls_mod_lock); | |
69 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) | |
70 | if (!strcmp(ops->kind, t->kind)) | |
71 | goto out; | |
72 | ||
73 | ops->next = NULL; | |
74 | *tp = ops; | |
75 | rc = 0; | |
76 | out: | |
77 | write_unlock(&cls_mod_lock); | |
78 | return rc; | |
79 | } | |
aa767bfe | 80 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 LT |
81 | |
82 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) | |
83 | { | |
84 | struct tcf_proto_ops *t, **tp; | |
85 | int rc = -ENOENT; | |
86 | ||
87 | write_lock(&cls_mod_lock); | |
cc7ec456 | 88 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) |
1da177e4 LT |
89 | if (t == ops) |
90 | break; | |
91 | ||
92 | if (!t) | |
93 | goto out; | |
94 | *tp = t->next; | |
95 | rc = 0; | |
96 | out: | |
97 | write_unlock(&cls_mod_lock); | |
98 | return rc; | |
99 | } | |
aa767bfe | 100 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 101 | |
7316ae88 TG |
102 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
103 | struct nlmsghdr *n, struct tcf_proto *tp, | |
104 | unsigned long fh, int event); | |
1da177e4 LT |
105 | |
106 | ||
107 | /* Select new prio value from the range, managed by kernel. */ | |
108 | ||
aa767bfe | 109 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 110 | { |
aa767bfe | 111 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
112 | |
113 | if (tp) | |
cc7ec456 | 114 | first = tp->prio - 1; |
1da177e4 LT |
115 | |
116 | return first; | |
117 | } | |
118 | ||
119 | /* Add/change/delete/get a filter node */ | |
120 | ||
661d2967 | 121 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 122 | { |
3b1e0a65 | 123 | struct net *net = sock_net(skb->sk); |
add93b61 | 124 | struct nlattr *tca[TCA_MAX + 1]; |
55dbc640 | 125 | spinlock_t *root_lock; |
1da177e4 LT |
126 | struct tcmsg *t; |
127 | u32 protocol; | |
128 | u32 prio; | |
129 | u32 nprio; | |
130 | u32 parent; | |
131 | struct net_device *dev; | |
132 | struct Qdisc *q; | |
133 | struct tcf_proto **back, **chain; | |
134 | struct tcf_proto *tp; | |
dc7f9f6e | 135 | const struct tcf_proto_ops *tp_ops; |
20fea08b | 136 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
137 | unsigned long cl; |
138 | unsigned long fh; | |
139 | int err; | |
12186be7 | 140 | int tp_created = 0; |
1da177e4 | 141 | |
dfc47ef8 EB |
142 | if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN)) |
143 | return -EPERM; | |
de179c8c | 144 | |
1da177e4 | 145 | replay: |
de179c8c H |
146 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
147 | if (err < 0) | |
148 | return err; | |
149 | ||
942b8165 | 150 | t = nlmsg_data(n); |
1da177e4 LT |
151 | protocol = TC_H_MIN(t->tcm_info); |
152 | prio = TC_H_MAJ(t->tcm_info); | |
153 | nprio = prio; | |
154 | parent = t->tcm_parent; | |
155 | cl = 0; | |
156 | ||
157 | if (prio == 0) { | |
158 | /* If no priority is given, user wants we allocated it. */ | |
cc7ec456 ED |
159 | if (n->nlmsg_type != RTM_NEWTFILTER || |
160 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 | 161 | return -ENOENT; |
aa767bfe | 162 | prio = TC_H_MAKE(0x80000000U, 0U); |
1da177e4 LT |
163 | } |
164 | ||
165 | /* Find head of filter chain. */ | |
166 | ||
167 | /* Find link */ | |
7316ae88 | 168 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 169 | if (dev == NULL) |
1da177e4 LT |
170 | return -ENODEV; |
171 | ||
172 | /* Find qdisc */ | |
173 | if (!parent) { | |
af356afa | 174 | q = dev->qdisc; |
1da177e4 | 175 | parent = q->handle; |
aa767bfe SH |
176 | } else { |
177 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
178 | if (q == NULL) | |
179 | return -EINVAL; | |
180 | } | |
1da177e4 LT |
181 | |
182 | /* Is it classful? */ | |
cc7ec456 ED |
183 | cops = q->ops->cl_ops; |
184 | if (!cops) | |
1da177e4 LT |
185 | return -EINVAL; |
186 | ||
71ebe5e9 PM |
187 | if (cops->tcf_chain == NULL) |
188 | return -EOPNOTSUPP; | |
189 | ||
1da177e4 LT |
190 | /* Do we search for filter, attached to class? */ |
191 | if (TC_H_MIN(parent)) { | |
192 | cl = cops->get(q, parent); | |
193 | if (cl == 0) | |
194 | return -ENOENT; | |
195 | } | |
196 | ||
197 | /* And the last stroke */ | |
198 | chain = cops->tcf_chain(q, cl); | |
199 | err = -EINVAL; | |
200 | if (chain == NULL) | |
201 | goto errout; | |
202 | ||
203 | /* Check the chain for existence of proto-tcf with this priority */ | |
cc7ec456 | 204 | for (back = chain; (tp = *back) != NULL; back = &tp->next) { |
1da177e4 LT |
205 | if (tp->prio >= prio) { |
206 | if (tp->prio == prio) { | |
cc7ec456 ED |
207 | if (!nprio || |
208 | (tp->protocol != protocol && protocol)) | |
1da177e4 LT |
209 | goto errout; |
210 | } else | |
211 | tp = NULL; | |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
102396ae | 216 | root_lock = qdisc_root_sleeping_lock(q); |
55dbc640 | 217 | |
1da177e4 LT |
218 | if (tp == NULL) { |
219 | /* Proto-tcf does not exist, create new one */ | |
220 | ||
add93b61 | 221 | if (tca[TCA_KIND] == NULL || !protocol) |
1da177e4 LT |
222 | goto errout; |
223 | ||
224 | err = -ENOENT; | |
cc7ec456 ED |
225 | if (n->nlmsg_type != RTM_NEWTFILTER || |
226 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
227 | goto errout; |
228 | ||
229 | ||
230 | /* Create new proto tcf */ | |
231 | ||
232 | err = -ENOBUFS; | |
aa767bfe SH |
233 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
234 | if (tp == NULL) | |
1da177e4 | 235 | goto errout; |
f2df8249 | 236 | err = -ENOENT; |
add93b61 | 237 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
1da177e4 | 238 | if (tp_ops == NULL) { |
95a5afca | 239 | #ifdef CONFIG_MODULES |
add93b61 | 240 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
241 | char name[IFNAMSIZ]; |
242 | ||
243 | if (kind != NULL && | |
add93b61 | 244 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
245 | rtnl_unlock(); |
246 | request_module("cls_%s", name); | |
247 | rtnl_lock(); | |
248 | tp_ops = tcf_proto_lookup_ops(kind); | |
249 | /* We dropped the RTNL semaphore in order to | |
250 | * perform the module load. So, even if we | |
251 | * succeeded in loading the module we have to | |
252 | * replay the request. We indicate this using | |
253 | * -EAGAIN. | |
254 | */ | |
255 | if (tp_ops != NULL) { | |
256 | module_put(tp_ops->owner); | |
257 | err = -EAGAIN; | |
258 | } | |
259 | } | |
260 | #endif | |
261 | kfree(tp); | |
262 | goto errout; | |
263 | } | |
1da177e4 LT |
264 | tp->ops = tp_ops; |
265 | tp->protocol = protocol; | |
d0ab8ff8 | 266 | tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back)); |
1da177e4 LT |
267 | tp->q = q; |
268 | tp->classify = tp_ops->classify; | |
269 | tp->classid = parent; | |
aa767bfe SH |
270 | |
271 | err = tp_ops->init(tp); | |
272 | if (err != 0) { | |
1da177e4 LT |
273 | module_put(tp_ops->owner); |
274 | kfree(tp); | |
275 | goto errout; | |
276 | } | |
277 | ||
12186be7 | 278 | tp_created = 1; |
1da177e4 | 279 | |
add93b61 | 280 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
1da177e4 LT |
281 | goto errout; |
282 | ||
283 | fh = tp->ops->get(tp, t->tcm_handle); | |
284 | ||
285 | if (fh == 0) { | |
286 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
55dbc640 | 287 | spin_lock_bh(root_lock); |
1da177e4 | 288 | *back = tp->next; |
323c0488 | 289 | spin_unlock_bh(root_lock); |
1da177e4 | 290 | |
7316ae88 | 291 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
292 | tcf_destroy(tp); |
293 | err = 0; | |
294 | goto errout; | |
295 | } | |
296 | ||
297 | err = -ENOENT; | |
aa767bfe SH |
298 | if (n->nlmsg_type != RTM_NEWTFILTER || |
299 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
300 | goto errout; |
301 | } else { | |
302 | switch (n->nlmsg_type) { | |
10297b99 | 303 | case RTM_NEWTFILTER: |
1da177e4 | 304 | err = -EEXIST; |
12186be7 MU |
305 | if (n->nlmsg_flags & NLM_F_EXCL) { |
306 | if (tp_created) | |
307 | tcf_destroy(tp); | |
1da177e4 | 308 | goto errout; |
12186be7 | 309 | } |
1da177e4 LT |
310 | break; |
311 | case RTM_DELTFILTER: | |
312 | err = tp->ops->delete(tp, fh); | |
313 | if (err == 0) | |
7316ae88 | 314 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
315 | goto errout; |
316 | case RTM_GETTFILTER: | |
7316ae88 | 317 | err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
1da177e4 LT |
318 | goto errout; |
319 | default: | |
320 | err = -EINVAL; | |
321 | goto errout; | |
322 | } | |
323 | } | |
324 | ||
c1b52739 | 325 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh); |
12186be7 MU |
326 | if (err == 0) { |
327 | if (tp_created) { | |
328 | spin_lock_bh(root_lock); | |
329 | tp->next = *back; | |
330 | *back = tp; | |
331 | spin_unlock_bh(root_lock); | |
332 | } | |
7316ae88 | 333 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
12186be7 MU |
334 | } else { |
335 | if (tp_created) | |
336 | tcf_destroy(tp); | |
337 | } | |
1da177e4 LT |
338 | |
339 | errout: | |
340 | if (cl) | |
341 | cops->put(q, cl); | |
342 | if (err == -EAGAIN) | |
343 | /* Replay the request. */ | |
344 | goto replay; | |
345 | return err; | |
346 | } | |
347 | ||
aa767bfe | 348 | static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, |
15e47304 | 349 | unsigned long fh, u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
350 | { |
351 | struct tcmsg *tcm; | |
352 | struct nlmsghdr *nlh; | |
27a884dc | 353 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 354 | |
15e47304 | 355 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
356 | if (!nlh) |
357 | goto out_nlmsg_trim; | |
358 | tcm = nlmsg_data(nlh); | |
1da177e4 | 359 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 360 | tcm->tcm__pad1 = 0; |
ad61df91 | 361 | tcm->tcm__pad2 = 0; |
5ce2d488 | 362 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
363 | tcm->tcm_parent = tp->classid; |
364 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
365 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
366 | goto nla_put_failure; | |
1da177e4 LT |
367 | tcm->tcm_handle = fh; |
368 | if (RTM_DELTFILTER != event) { | |
369 | tcm->tcm_handle = 0; | |
370 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) | |
add93b61 | 371 | goto nla_put_failure; |
1da177e4 | 372 | } |
27a884dc | 373 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
374 | return skb->len; |
375 | ||
942b8165 | 376 | out_nlmsg_trim: |
add93b61 | 377 | nla_put_failure: |
dc5fc579 | 378 | nlmsg_trim(skb, b); |
1da177e4 LT |
379 | return -1; |
380 | } | |
381 | ||
7316ae88 TG |
382 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
383 | struct nlmsghdr *n, struct tcf_proto *tp, | |
384 | unsigned long fh, int event) | |
1da177e4 LT |
385 | { |
386 | struct sk_buff *skb; | |
15e47304 | 387 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
388 | |
389 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
390 | if (!skb) | |
391 | return -ENOBUFS; | |
392 | ||
15e47304 | 393 | if (tcf_fill_node(skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) { |
1da177e4 LT |
394 | kfree_skb(skb); |
395 | return -EINVAL; | |
396 | } | |
397 | ||
15e47304 | 398 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 399 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
400 | } |
401 | ||
aa767bfe | 402 | struct tcf_dump_args { |
1da177e4 LT |
403 | struct tcf_walker w; |
404 | struct sk_buff *skb; | |
405 | struct netlink_callback *cb; | |
406 | }; | |
407 | ||
aa767bfe SH |
408 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
409 | struct tcf_walker *arg) | |
1da177e4 | 410 | { |
aa767bfe | 411 | struct tcf_dump_args *a = (void *)arg; |
1da177e4 | 412 | |
15e47304 | 413 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
414 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
415 | } | |
416 | ||
bd27a875 | 417 | /* called with RTNL */ |
1da177e4 LT |
418 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
419 | { | |
3b1e0a65 | 420 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
421 | int t; |
422 | int s_t; | |
423 | struct net_device *dev; | |
424 | struct Qdisc *q; | |
425 | struct tcf_proto *tp, **chain; | |
942b8165 | 426 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 427 | unsigned long cl = 0; |
20fea08b | 428 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
429 | struct tcf_dump_args arg; |
430 | ||
573ce260 | 431 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 432 | return skb->len; |
cc7ec456 ED |
433 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
434 | if (!dev) | |
1da177e4 LT |
435 | return skb->len; |
436 | ||
1da177e4 | 437 | if (!tcm->tcm_parent) |
af356afa | 438 | q = dev->qdisc; |
1da177e4 LT |
439 | else |
440 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
441 | if (!q) | |
442 | goto out; | |
cc7ec456 ED |
443 | cops = q->ops->cl_ops; |
444 | if (!cops) | |
1da177e4 | 445 | goto errout; |
71ebe5e9 PM |
446 | if (cops->tcf_chain == NULL) |
447 | goto errout; | |
1da177e4 LT |
448 | if (TC_H_MIN(tcm->tcm_parent)) { |
449 | cl = cops->get(q, tcm->tcm_parent); | |
450 | if (cl == 0) | |
451 | goto errout; | |
452 | } | |
453 | chain = cops->tcf_chain(q, cl); | |
454 | if (chain == NULL) | |
455 | goto errout; | |
456 | ||
457 | s_t = cb->args[0]; | |
458 | ||
cc7ec456 ED |
459 | for (tp = *chain, t = 0; tp; tp = tp->next, t++) { |
460 | if (t < s_t) | |
461 | continue; | |
1da177e4 LT |
462 | if (TC_H_MAJ(tcm->tcm_info) && |
463 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
464 | continue; | |
465 | if (TC_H_MIN(tcm->tcm_info) && | |
466 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
467 | continue; | |
468 | if (t > s_t) | |
469 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
470 | if (cb->args[1] == 0) { | |
15e47304 | 471 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).portid, |
aa767bfe SH |
472 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
473 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 474 | break; |
aa767bfe | 475 | |
1da177e4 LT |
476 | cb->args[1] = 1; |
477 | } | |
478 | if (tp->ops->walk == NULL) | |
479 | continue; | |
480 | arg.w.fn = tcf_node_dump; | |
481 | arg.skb = skb; | |
482 | arg.cb = cb; | |
483 | arg.w.stop = 0; | |
cc7ec456 | 484 | arg.w.skip = cb->args[1] - 1; |
1da177e4 LT |
485 | arg.w.count = 0; |
486 | tp->ops->walk(tp, &arg.w); | |
cc7ec456 | 487 | cb->args[1] = arg.w.count + 1; |
1da177e4 LT |
488 | if (arg.w.stop) |
489 | break; | |
490 | } | |
491 | ||
492 | cb->args[0] = t; | |
493 | ||
494 | errout: | |
495 | if (cl) | |
496 | cops->put(q, cl); | |
497 | out: | |
1da177e4 LT |
498 | return skb->len; |
499 | } | |
500 | ||
aa767bfe | 501 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
1da177e4 LT |
502 | { |
503 | #ifdef CONFIG_NET_CLS_ACT | |
504 | if (exts->action) { | |
505 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); | |
506 | exts->action = NULL; | |
507 | } | |
1da177e4 LT |
508 | #endif |
509 | } | |
aa767bfe | 510 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 511 | |
c1b52739 | 512 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
add93b61 | 513 | struct nlattr *rate_tlv, struct tcf_exts *exts, |
5239008b | 514 | const struct tcf_ext_map *map) |
1da177e4 LT |
515 | { |
516 | memset(exts, 0, sizeof(*exts)); | |
10297b99 | 517 | |
1da177e4 LT |
518 | #ifdef CONFIG_NET_CLS_ACT |
519 | { | |
1da177e4 LT |
520 | struct tc_action *act; |
521 | ||
add93b61 | 522 | if (map->police && tb[map->police]) { |
c1b52739 | 523 | act = tcf_action_init_1(net, tb[map->police], rate_tlv, |
aa767bfe | 524 | "police", TCA_ACT_NOREPLACE, |
ab27cfb8 PM |
525 | TCA_ACT_BIND); |
526 | if (IS_ERR(act)) | |
527 | return PTR_ERR(act); | |
1da177e4 LT |
528 | |
529 | act->type = TCA_OLD_COMPAT; | |
530 | exts->action = act; | |
add93b61 | 531 | } else if (map->action && tb[map->action]) { |
c1b52739 BL |
532 | act = tcf_action_init(net, tb[map->action], rate_tlv, |
533 | NULL, TCA_ACT_NOREPLACE, | |
534 | TCA_ACT_BIND); | |
ab27cfb8 PM |
535 | if (IS_ERR(act)) |
536 | return PTR_ERR(act); | |
1da177e4 LT |
537 | |
538 | exts->action = act; | |
539 | } | |
540 | } | |
1da177e4 | 541 | #else |
add93b61 PM |
542 | if ((map->action && tb[map->action]) || |
543 | (map->police && tb[map->police])) | |
1da177e4 LT |
544 | return -EOPNOTSUPP; |
545 | #endif | |
546 | ||
547 | return 0; | |
548 | } | |
aa767bfe | 549 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 550 | |
aa767bfe SH |
551 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
552 | struct tcf_exts *src) | |
1da177e4 LT |
553 | { |
554 | #ifdef CONFIG_NET_CLS_ACT | |
555 | if (src->action) { | |
556 | struct tc_action *act; | |
557 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
558 | act = dst->action; |
559 | dst->action = src->action; | |
1da177e4 LT |
560 | tcf_tree_unlock(tp); |
561 | if (act) | |
562 | tcf_action_destroy(act, TCA_ACT_UNBIND); | |
563 | } | |
1da177e4 LT |
564 | #endif |
565 | } | |
aa767bfe | 566 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 567 | |
aa767bfe | 568 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 569 | const struct tcf_ext_map *map) |
1da177e4 LT |
570 | { |
571 | #ifdef CONFIG_NET_CLS_ACT | |
572 | if (map->action && exts->action) { | |
573 | /* | |
574 | * again for backward compatible mode - we want | |
575 | * to work with both old and new modes of entering | |
576 | * tc data even if iproute2 was newer - jhs | |
577 | */ | |
4b3550ef | 578 | struct nlattr *nest; |
1da177e4 LT |
579 | |
580 | if (exts->action->type != TCA_OLD_COMPAT) { | |
4b3550ef PM |
581 | nest = nla_nest_start(skb, map->action); |
582 | if (nest == NULL) | |
583 | goto nla_put_failure; | |
1da177e4 | 584 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
add93b61 | 585 | goto nla_put_failure; |
4b3550ef | 586 | nla_nest_end(skb, nest); |
1da177e4 | 587 | } else if (map->police) { |
4b3550ef PM |
588 | nest = nla_nest_start(skb, map->police); |
589 | if (nest == NULL) | |
590 | goto nla_put_failure; | |
1da177e4 | 591 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
add93b61 | 592 | goto nla_put_failure; |
4b3550ef | 593 | nla_nest_end(skb, nest); |
1da177e4 LT |
594 | } |
595 | } | |
1da177e4 LT |
596 | #endif |
597 | return 0; | |
add93b61 | 598 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
599 | return -1; |
600 | } | |
aa767bfe | 601 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 602 | |
aa767bfe SH |
603 | |
604 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 605 | const struct tcf_ext_map *map) |
1da177e4 LT |
606 | { |
607 | #ifdef CONFIG_NET_CLS_ACT | |
608 | if (exts->action) | |
609 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) | |
add93b61 | 610 | goto nla_put_failure; |
1da177e4 LT |
611 | #endif |
612 | return 0; | |
add93b61 | 613 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
614 | return -1; |
615 | } | |
aa767bfe | 616 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 LT |
617 | |
618 | static int __init tc_filter_init(void) | |
619 | { | |
c7ac8679 GR |
620 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
621 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 622 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 623 | tc_dump_tfilter, NULL); |
1da177e4 | 624 | |
1da177e4 LT |
625 | return 0; |
626 | } | |
627 | ||
628 | subsys_initcall(tc_filter_init); |