Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sched/cls_api.c Packet classifier API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Changes: | |
12 | * | |
13 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
14 | * | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 | 20 | #include <linux/string.h> |
1da177e4 | 21 | #include <linux/errno.h> |
1da177e4 | 22 | #include <linux/skbuff.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/kmod.h> | |
ab27cfb8 | 25 | #include <linux/err.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
b854272b DL |
27 | #include <net/net_namespace.h> |
28 | #include <net/sock.h> | |
dc5fc579 | 29 | #include <net/netlink.h> |
1da177e4 LT |
30 | #include <net/pkt_sched.h> |
31 | #include <net/pkt_cls.h> | |
32 | ||
1da177e4 LT |
33 | /* The list of all installed classifier types */ |
34 | ||
2eb9d75c | 35 | static struct tcf_proto_ops *tcf_proto_base __read_mostly; |
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 | ||
dc7f9f6e | 42 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) |
1da177e4 | 43 | { |
dc7f9f6e | 44 | const struct tcf_proto_ops *t = NULL; |
1da177e4 LT |
45 | |
46 | if (kind) { | |
47 | read_lock(&cls_mod_lock); | |
48 | for (t = tcf_proto_base; t; t = t->next) { | |
add93b61 | 49 | if (nla_strcmp(kind, t->kind) == 0) { |
1da177e4 LT |
50 | if (!try_module_get(t->owner)) |
51 | t = NULL; | |
52 | break; | |
53 | } | |
54 | } | |
55 | read_unlock(&cls_mod_lock); | |
56 | } | |
57 | return t; | |
58 | } | |
59 | ||
60 | /* Register(unregister) new classifier type */ | |
61 | ||
62 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
63 | { | |
64 | struct tcf_proto_ops *t, **tp; | |
65 | int rc = -EEXIST; | |
66 | ||
67 | write_lock(&cls_mod_lock); | |
68 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) | |
69 | if (!strcmp(ops->kind, t->kind)) | |
70 | goto out; | |
71 | ||
72 | ops->next = NULL; | |
73 | *tp = ops; | |
74 | rc = 0; | |
75 | out: | |
76 | write_unlock(&cls_mod_lock); | |
77 | return rc; | |
78 | } | |
aa767bfe | 79 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 LT |
80 | |
81 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) | |
82 | { | |
83 | struct tcf_proto_ops *t, **tp; | |
84 | int rc = -ENOENT; | |
85 | ||
86 | write_lock(&cls_mod_lock); | |
cc7ec456 | 87 | for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next) |
1da177e4 LT |
88 | if (t == ops) |
89 | break; | |
90 | ||
91 | if (!t) | |
92 | goto out; | |
93 | *tp = t->next; | |
94 | rc = 0; | |
95 | out: | |
96 | write_unlock(&cls_mod_lock); | |
97 | return rc; | |
98 | } | |
aa767bfe | 99 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 100 | |
7316ae88 TG |
101 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
102 | struct nlmsghdr *n, struct tcf_proto *tp, | |
103 | unsigned long fh, int event); | |
1da177e4 LT |
104 | |
105 | ||
106 | /* Select new prio value from the range, managed by kernel. */ | |
107 | ||
aa767bfe | 108 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 109 | { |
aa767bfe | 110 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
111 | |
112 | if (tp) | |
cc7ec456 | 113 | first = tp->prio - 1; |
1da177e4 LT |
114 | |
115 | return first; | |
116 | } | |
117 | ||
118 | /* Add/change/delete/get a filter node */ | |
119 | ||
661d2967 | 120 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 121 | { |
3b1e0a65 | 122 | struct net *net = sock_net(skb->sk); |
add93b61 | 123 | struct nlattr *tca[TCA_MAX + 1]; |
55dbc640 | 124 | spinlock_t *root_lock; |
1da177e4 LT |
125 | struct tcmsg *t; |
126 | u32 protocol; | |
127 | u32 prio; | |
128 | u32 nprio; | |
129 | u32 parent; | |
130 | struct net_device *dev; | |
131 | struct Qdisc *q; | |
132 | struct tcf_proto **back, **chain; | |
133 | struct tcf_proto *tp; | |
dc7f9f6e | 134 | const struct tcf_proto_ops *tp_ops; |
20fea08b | 135 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
136 | unsigned long cl; |
137 | unsigned long fh; | |
138 | int err; | |
12186be7 | 139 | int tp_created = 0; |
1da177e4 | 140 | |
dfc47ef8 EB |
141 | if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN)) |
142 | return -EPERM; | |
de179c8c | 143 | |
1da177e4 | 144 | replay: |
de179c8c H |
145 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
146 | if (err < 0) | |
147 | return err; | |
148 | ||
942b8165 | 149 | t = nlmsg_data(n); |
1da177e4 LT |
150 | protocol = TC_H_MIN(t->tcm_info); |
151 | prio = TC_H_MAJ(t->tcm_info); | |
152 | nprio = prio; | |
153 | parent = t->tcm_parent; | |
154 | cl = 0; | |
155 | ||
156 | if (prio == 0) { | |
157 | /* If no priority is given, user wants we allocated it. */ | |
cc7ec456 ED |
158 | if (n->nlmsg_type != RTM_NEWTFILTER || |
159 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 | 160 | return -ENOENT; |
aa767bfe | 161 | prio = TC_H_MAKE(0x80000000U, 0U); |
1da177e4 LT |
162 | } |
163 | ||
164 | /* Find head of filter chain. */ | |
165 | ||
166 | /* Find link */ | |
7316ae88 | 167 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 168 | if (dev == NULL) |
1da177e4 LT |
169 | return -ENODEV; |
170 | ||
171 | /* Find qdisc */ | |
172 | if (!parent) { | |
af356afa | 173 | q = dev->qdisc; |
1da177e4 | 174 | parent = q->handle; |
aa767bfe SH |
175 | } else { |
176 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
177 | if (q == NULL) | |
178 | return -EINVAL; | |
179 | } | |
1da177e4 LT |
180 | |
181 | /* Is it classful? */ | |
cc7ec456 ED |
182 | cops = q->ops->cl_ops; |
183 | if (!cops) | |
1da177e4 LT |
184 | return -EINVAL; |
185 | ||
71ebe5e9 PM |
186 | if (cops->tcf_chain == NULL) |
187 | return -EOPNOTSUPP; | |
188 | ||
1da177e4 LT |
189 | /* Do we search for filter, attached to class? */ |
190 | if (TC_H_MIN(parent)) { | |
191 | cl = cops->get(q, parent); | |
192 | if (cl == 0) | |
193 | return -ENOENT; | |
194 | } | |
195 | ||
196 | /* And the last stroke */ | |
197 | chain = cops->tcf_chain(q, cl); | |
198 | err = -EINVAL; | |
199 | if (chain == NULL) | |
200 | goto errout; | |
201 | ||
202 | /* Check the chain for existence of proto-tcf with this priority */ | |
cc7ec456 | 203 | for (back = chain; (tp = *back) != NULL; back = &tp->next) { |
1da177e4 LT |
204 | if (tp->prio >= prio) { |
205 | if (tp->prio == prio) { | |
cc7ec456 ED |
206 | if (!nprio || |
207 | (tp->protocol != protocol && protocol)) | |
1da177e4 LT |
208 | goto errout; |
209 | } else | |
210 | tp = NULL; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
102396ae | 215 | root_lock = qdisc_root_sleeping_lock(q); |
55dbc640 | 216 | |
1da177e4 LT |
217 | if (tp == NULL) { |
218 | /* Proto-tcf does not exist, create new one */ | |
219 | ||
add93b61 | 220 | if (tca[TCA_KIND] == NULL || !protocol) |
1da177e4 LT |
221 | goto errout; |
222 | ||
223 | err = -ENOENT; | |
cc7ec456 ED |
224 | if (n->nlmsg_type != RTM_NEWTFILTER || |
225 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
226 | goto errout; |
227 | ||
228 | ||
229 | /* Create new proto tcf */ | |
230 | ||
231 | err = -ENOBUFS; | |
aa767bfe SH |
232 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
233 | if (tp == NULL) | |
1da177e4 | 234 | goto errout; |
f2df8249 | 235 | err = -ENOENT; |
add93b61 | 236 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
1da177e4 | 237 | if (tp_ops == NULL) { |
95a5afca | 238 | #ifdef CONFIG_MODULES |
add93b61 | 239 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
240 | char name[IFNAMSIZ]; |
241 | ||
242 | if (kind != NULL && | |
add93b61 | 243 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
244 | rtnl_unlock(); |
245 | request_module("cls_%s", name); | |
246 | rtnl_lock(); | |
247 | tp_ops = tcf_proto_lookup_ops(kind); | |
248 | /* We dropped the RTNL semaphore in order to | |
249 | * perform the module load. So, even if we | |
250 | * succeeded in loading the module we have to | |
251 | * replay the request. We indicate this using | |
252 | * -EAGAIN. | |
253 | */ | |
254 | if (tp_ops != NULL) { | |
255 | module_put(tp_ops->owner); | |
256 | err = -EAGAIN; | |
257 | } | |
258 | } | |
259 | #endif | |
260 | kfree(tp); | |
261 | goto errout; | |
262 | } | |
1da177e4 LT |
263 | tp->ops = tp_ops; |
264 | tp->protocol = protocol; | |
d0ab8ff8 | 265 | tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back)); |
1da177e4 LT |
266 | tp->q = q; |
267 | tp->classify = tp_ops->classify; | |
268 | tp->classid = parent; | |
aa767bfe SH |
269 | |
270 | err = tp_ops->init(tp); | |
271 | if (err != 0) { | |
1da177e4 LT |
272 | module_put(tp_ops->owner); |
273 | kfree(tp); | |
274 | goto errout; | |
275 | } | |
276 | ||
12186be7 | 277 | tp_created = 1; |
1da177e4 | 278 | |
add93b61 | 279 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
1da177e4 LT |
280 | goto errout; |
281 | ||
282 | fh = tp->ops->get(tp, t->tcm_handle); | |
283 | ||
284 | if (fh == 0) { | |
285 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
55dbc640 | 286 | spin_lock_bh(root_lock); |
1da177e4 | 287 | *back = tp->next; |
323c0488 | 288 | spin_unlock_bh(root_lock); |
1da177e4 | 289 | |
7316ae88 | 290 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
291 | tcf_destroy(tp); |
292 | err = 0; | |
293 | goto errout; | |
294 | } | |
295 | ||
296 | err = -ENOENT; | |
aa767bfe SH |
297 | if (n->nlmsg_type != RTM_NEWTFILTER || |
298 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
299 | goto errout; |
300 | } else { | |
301 | switch (n->nlmsg_type) { | |
10297b99 | 302 | case RTM_NEWTFILTER: |
1da177e4 | 303 | err = -EEXIST; |
12186be7 MU |
304 | if (n->nlmsg_flags & NLM_F_EXCL) { |
305 | if (tp_created) | |
306 | tcf_destroy(tp); | |
1da177e4 | 307 | goto errout; |
12186be7 | 308 | } |
1da177e4 LT |
309 | break; |
310 | case RTM_DELTFILTER: | |
311 | err = tp->ops->delete(tp, fh); | |
312 | if (err == 0) | |
7316ae88 | 313 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
314 | goto errout; |
315 | case RTM_GETTFILTER: | |
7316ae88 | 316 | err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
1da177e4 LT |
317 | goto errout; |
318 | default: | |
319 | err = -EINVAL; | |
320 | goto errout; | |
321 | } | |
322 | } | |
323 | ||
c1b52739 | 324 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh); |
12186be7 MU |
325 | if (err == 0) { |
326 | if (tp_created) { | |
327 | spin_lock_bh(root_lock); | |
328 | tp->next = *back; | |
329 | *back = tp; | |
330 | spin_unlock_bh(root_lock); | |
331 | } | |
7316ae88 | 332 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
12186be7 MU |
333 | } else { |
334 | if (tp_created) | |
335 | tcf_destroy(tp); | |
336 | } | |
1da177e4 LT |
337 | |
338 | errout: | |
339 | if (cl) | |
340 | cops->put(q, cl); | |
341 | if (err == -EAGAIN) | |
342 | /* Replay the request. */ | |
343 | goto replay; | |
344 | return err; | |
345 | } | |
346 | ||
aa767bfe | 347 | static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, |
15e47304 | 348 | unsigned long fh, u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
349 | { |
350 | struct tcmsg *tcm; | |
351 | struct nlmsghdr *nlh; | |
27a884dc | 352 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 353 | |
15e47304 | 354 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
355 | if (!nlh) |
356 | goto out_nlmsg_trim; | |
357 | tcm = nlmsg_data(nlh); | |
1da177e4 | 358 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 359 | tcm->tcm__pad1 = 0; |
ad61df91 | 360 | tcm->tcm__pad2 = 0; |
5ce2d488 | 361 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
362 | tcm->tcm_parent = tp->classid; |
363 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
364 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
365 | goto nla_put_failure; | |
1da177e4 LT |
366 | tcm->tcm_handle = fh; |
367 | if (RTM_DELTFILTER != event) { | |
368 | tcm->tcm_handle = 0; | |
369 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) | |
add93b61 | 370 | goto nla_put_failure; |
1da177e4 | 371 | } |
27a884dc | 372 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
373 | return skb->len; |
374 | ||
942b8165 | 375 | out_nlmsg_trim: |
add93b61 | 376 | nla_put_failure: |
dc5fc579 | 377 | nlmsg_trim(skb, b); |
1da177e4 LT |
378 | return -1; |
379 | } | |
380 | ||
7316ae88 TG |
381 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
382 | struct nlmsghdr *n, struct tcf_proto *tp, | |
383 | unsigned long fh, int event) | |
1da177e4 LT |
384 | { |
385 | struct sk_buff *skb; | |
15e47304 | 386 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
387 | |
388 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
389 | if (!skb) | |
390 | return -ENOBUFS; | |
391 | ||
15e47304 | 392 | if (tcf_fill_node(skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) { |
1da177e4 LT |
393 | kfree_skb(skb); |
394 | return -EINVAL; | |
395 | } | |
396 | ||
15e47304 | 397 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 398 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
399 | } |
400 | ||
aa767bfe | 401 | struct tcf_dump_args { |
1da177e4 LT |
402 | struct tcf_walker w; |
403 | struct sk_buff *skb; | |
404 | struct netlink_callback *cb; | |
405 | }; | |
406 | ||
aa767bfe SH |
407 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
408 | struct tcf_walker *arg) | |
1da177e4 | 409 | { |
aa767bfe | 410 | struct tcf_dump_args *a = (void *)arg; |
1da177e4 | 411 | |
15e47304 | 412 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
413 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
414 | } | |
415 | ||
bd27a875 | 416 | /* called with RTNL */ |
1da177e4 LT |
417 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
418 | { | |
3b1e0a65 | 419 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
420 | int t; |
421 | int s_t; | |
422 | struct net_device *dev; | |
423 | struct Qdisc *q; | |
424 | struct tcf_proto *tp, **chain; | |
942b8165 | 425 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 426 | unsigned long cl = 0; |
20fea08b | 427 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
428 | struct tcf_dump_args arg; |
429 | ||
573ce260 | 430 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 431 | return skb->len; |
cc7ec456 ED |
432 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
433 | if (!dev) | |
1da177e4 LT |
434 | return skb->len; |
435 | ||
1da177e4 | 436 | if (!tcm->tcm_parent) |
af356afa | 437 | q = dev->qdisc; |
1da177e4 LT |
438 | else |
439 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
440 | if (!q) | |
441 | goto out; | |
cc7ec456 ED |
442 | cops = q->ops->cl_ops; |
443 | if (!cops) | |
1da177e4 | 444 | goto errout; |
71ebe5e9 PM |
445 | if (cops->tcf_chain == NULL) |
446 | goto errout; | |
1da177e4 LT |
447 | if (TC_H_MIN(tcm->tcm_parent)) { |
448 | cl = cops->get(q, tcm->tcm_parent); | |
449 | if (cl == 0) | |
450 | goto errout; | |
451 | } | |
452 | chain = cops->tcf_chain(q, cl); | |
453 | if (chain == NULL) | |
454 | goto errout; | |
455 | ||
456 | s_t = cb->args[0]; | |
457 | ||
cc7ec456 ED |
458 | for (tp = *chain, t = 0; tp; tp = tp->next, t++) { |
459 | if (t < s_t) | |
460 | continue; | |
1da177e4 LT |
461 | if (TC_H_MAJ(tcm->tcm_info) && |
462 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
463 | continue; | |
464 | if (TC_H_MIN(tcm->tcm_info) && | |
465 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
466 | continue; | |
467 | if (t > s_t) | |
468 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
469 | if (cb->args[1] == 0) { | |
15e47304 | 470 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).portid, |
aa767bfe SH |
471 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
472 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 473 | break; |
aa767bfe | 474 | |
1da177e4 LT |
475 | cb->args[1] = 1; |
476 | } | |
477 | if (tp->ops->walk == NULL) | |
478 | continue; | |
479 | arg.w.fn = tcf_node_dump; | |
480 | arg.skb = skb; | |
481 | arg.cb = cb; | |
482 | arg.w.stop = 0; | |
cc7ec456 | 483 | arg.w.skip = cb->args[1] - 1; |
1da177e4 LT |
484 | arg.w.count = 0; |
485 | tp->ops->walk(tp, &arg.w); | |
cc7ec456 | 486 | cb->args[1] = arg.w.count + 1; |
1da177e4 LT |
487 | if (arg.w.stop) |
488 | break; | |
489 | } | |
490 | ||
491 | cb->args[0] = t; | |
492 | ||
493 | errout: | |
494 | if (cl) | |
495 | cops->put(q, cl); | |
496 | out: | |
1da177e4 LT |
497 | return skb->len; |
498 | } | |
499 | ||
aa767bfe | 500 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
1da177e4 LT |
501 | { |
502 | #ifdef CONFIG_NET_CLS_ACT | |
503 | if (exts->action) { | |
504 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); | |
505 | exts->action = NULL; | |
506 | } | |
1da177e4 LT |
507 | #endif |
508 | } | |
aa767bfe | 509 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 510 | |
c1b52739 | 511 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
add93b61 | 512 | struct nlattr *rate_tlv, struct tcf_exts *exts, |
5239008b | 513 | const struct tcf_ext_map *map) |
1da177e4 LT |
514 | { |
515 | memset(exts, 0, sizeof(*exts)); | |
10297b99 | 516 | |
1da177e4 LT |
517 | #ifdef CONFIG_NET_CLS_ACT |
518 | { | |
1da177e4 LT |
519 | struct tc_action *act; |
520 | ||
add93b61 | 521 | if (map->police && tb[map->police]) { |
c1b52739 | 522 | act = tcf_action_init_1(net, tb[map->police], rate_tlv, |
aa767bfe | 523 | "police", TCA_ACT_NOREPLACE, |
ab27cfb8 PM |
524 | TCA_ACT_BIND); |
525 | if (IS_ERR(act)) | |
526 | return PTR_ERR(act); | |
1da177e4 LT |
527 | |
528 | act->type = TCA_OLD_COMPAT; | |
529 | exts->action = act; | |
add93b61 | 530 | } else if (map->action && tb[map->action]) { |
c1b52739 BL |
531 | act = tcf_action_init(net, tb[map->action], rate_tlv, |
532 | NULL, TCA_ACT_NOREPLACE, | |
533 | TCA_ACT_BIND); | |
ab27cfb8 PM |
534 | if (IS_ERR(act)) |
535 | return PTR_ERR(act); | |
1da177e4 LT |
536 | |
537 | exts->action = act; | |
538 | } | |
539 | } | |
1da177e4 | 540 | #else |
add93b61 PM |
541 | if ((map->action && tb[map->action]) || |
542 | (map->police && tb[map->police])) | |
1da177e4 LT |
543 | return -EOPNOTSUPP; |
544 | #endif | |
545 | ||
546 | return 0; | |
547 | } | |
aa767bfe | 548 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 549 | |
aa767bfe SH |
550 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
551 | struct tcf_exts *src) | |
1da177e4 LT |
552 | { |
553 | #ifdef CONFIG_NET_CLS_ACT | |
554 | if (src->action) { | |
555 | struct tc_action *act; | |
556 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
557 | act = dst->action; |
558 | dst->action = src->action; | |
1da177e4 LT |
559 | tcf_tree_unlock(tp); |
560 | if (act) | |
561 | tcf_action_destroy(act, TCA_ACT_UNBIND); | |
562 | } | |
1da177e4 LT |
563 | #endif |
564 | } | |
aa767bfe | 565 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 566 | |
aa767bfe | 567 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 568 | const struct tcf_ext_map *map) |
1da177e4 LT |
569 | { |
570 | #ifdef CONFIG_NET_CLS_ACT | |
571 | if (map->action && exts->action) { | |
572 | /* | |
573 | * again for backward compatible mode - we want | |
574 | * to work with both old and new modes of entering | |
575 | * tc data even if iproute2 was newer - jhs | |
576 | */ | |
4b3550ef | 577 | struct nlattr *nest; |
1da177e4 LT |
578 | |
579 | if (exts->action->type != TCA_OLD_COMPAT) { | |
4b3550ef PM |
580 | nest = nla_nest_start(skb, map->action); |
581 | if (nest == NULL) | |
582 | goto nla_put_failure; | |
1da177e4 | 583 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
add93b61 | 584 | goto nla_put_failure; |
4b3550ef | 585 | nla_nest_end(skb, nest); |
1da177e4 | 586 | } else if (map->police) { |
4b3550ef PM |
587 | nest = nla_nest_start(skb, map->police); |
588 | if (nest == NULL) | |
589 | goto nla_put_failure; | |
1da177e4 | 590 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
add93b61 | 591 | goto nla_put_failure; |
4b3550ef | 592 | nla_nest_end(skb, nest); |
1da177e4 LT |
593 | } |
594 | } | |
1da177e4 LT |
595 | #endif |
596 | return 0; | |
add93b61 | 597 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
598 | return -1; |
599 | } | |
aa767bfe | 600 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 601 | |
aa767bfe SH |
602 | |
603 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 604 | const struct tcf_ext_map *map) |
1da177e4 LT |
605 | { |
606 | #ifdef CONFIG_NET_CLS_ACT | |
607 | if (exts->action) | |
608 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) | |
add93b61 | 609 | goto nla_put_failure; |
1da177e4 LT |
610 | #endif |
611 | return 0; | |
add93b61 | 612 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
613 | return -1; |
614 | } | |
aa767bfe | 615 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 LT |
616 | |
617 | static int __init tc_filter_init(void) | |
618 | { | |
c7ac8679 GR |
619 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
620 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 621 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 622 | tc_dump_tfilter, NULL); |
1da177e4 | 623 | |
1da177e4 LT |
624 | return 0; |
625 | } | |
626 | ||
627 | subsys_initcall(tc_filter_init); |