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; | |
4949c9e2 | 139 | int tp_created; |
1da177e4 | 140 | |
1141a455 | 141 | if ((n->nlmsg_type != RTM_GETTFILTER) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 | 142 | return -EPERM; |
de179c8c | 143 | |
1da177e4 | 144 | replay: |
4949c9e2 DB |
145 | tp_created = 0; |
146 | ||
de179c8c H |
147 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
148 | if (err < 0) | |
149 | return err; | |
150 | ||
942b8165 | 151 | t = nlmsg_data(n); |
1da177e4 LT |
152 | protocol = TC_H_MIN(t->tcm_info); |
153 | prio = TC_H_MAJ(t->tcm_info); | |
154 | nprio = prio; | |
155 | parent = t->tcm_parent; | |
156 | cl = 0; | |
157 | ||
158 | if (prio == 0) { | |
159 | /* If no priority is given, user wants we allocated it. */ | |
cc7ec456 ED |
160 | if (n->nlmsg_type != RTM_NEWTFILTER || |
161 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 | 162 | return -ENOENT; |
aa767bfe | 163 | prio = TC_H_MAKE(0x80000000U, 0U); |
1da177e4 LT |
164 | } |
165 | ||
166 | /* Find head of filter chain. */ | |
167 | ||
168 | /* Find link */ | |
7316ae88 | 169 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 170 | if (dev == NULL) |
1da177e4 LT |
171 | return -ENODEV; |
172 | ||
173 | /* Find qdisc */ | |
174 | if (!parent) { | |
af356afa | 175 | q = dev->qdisc; |
1da177e4 | 176 | parent = q->handle; |
aa767bfe SH |
177 | } else { |
178 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
179 | if (q == NULL) | |
180 | return -EINVAL; | |
181 | } | |
1da177e4 LT |
182 | |
183 | /* Is it classful? */ | |
cc7ec456 ED |
184 | cops = q->ops->cl_ops; |
185 | if (!cops) | |
1da177e4 LT |
186 | return -EINVAL; |
187 | ||
71ebe5e9 PM |
188 | if (cops->tcf_chain == NULL) |
189 | return -EOPNOTSUPP; | |
190 | ||
1da177e4 LT |
191 | /* Do we search for filter, attached to class? */ |
192 | if (TC_H_MIN(parent)) { | |
193 | cl = cops->get(q, parent); | |
194 | if (cl == 0) | |
195 | return -ENOENT; | |
196 | } | |
197 | ||
198 | /* And the last stroke */ | |
199 | chain = cops->tcf_chain(q, cl); | |
200 | err = -EINVAL; | |
201 | if (chain == NULL) | |
202 | goto errout; | |
203 | ||
204 | /* Check the chain for existence of proto-tcf with this priority */ | |
cc7ec456 | 205 | for (back = chain; (tp = *back) != NULL; back = &tp->next) { |
1da177e4 LT |
206 | if (tp->prio >= prio) { |
207 | if (tp->prio == prio) { | |
cc7ec456 ED |
208 | if (!nprio || |
209 | (tp->protocol != protocol && protocol)) | |
1da177e4 LT |
210 | goto errout; |
211 | } else | |
212 | tp = NULL; | |
213 | break; | |
214 | } | |
215 | } | |
216 | ||
102396ae | 217 | root_lock = qdisc_root_sleeping_lock(q); |
55dbc640 | 218 | |
1da177e4 LT |
219 | if (tp == NULL) { |
220 | /* Proto-tcf does not exist, create new one */ | |
221 | ||
add93b61 | 222 | if (tca[TCA_KIND] == NULL || !protocol) |
1da177e4 LT |
223 | goto errout; |
224 | ||
225 | err = -ENOENT; | |
cc7ec456 ED |
226 | if (n->nlmsg_type != RTM_NEWTFILTER || |
227 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
228 | goto errout; |
229 | ||
230 | ||
231 | /* Create new proto tcf */ | |
232 | ||
233 | err = -ENOBUFS; | |
aa767bfe SH |
234 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
235 | if (tp == NULL) | |
1da177e4 | 236 | goto errout; |
f2df8249 | 237 | err = -ENOENT; |
add93b61 | 238 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
1da177e4 | 239 | if (tp_ops == NULL) { |
95a5afca | 240 | #ifdef CONFIG_MODULES |
add93b61 | 241 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
242 | char name[IFNAMSIZ]; |
243 | ||
244 | if (kind != NULL && | |
add93b61 | 245 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
246 | rtnl_unlock(); |
247 | request_module("cls_%s", name); | |
248 | rtnl_lock(); | |
249 | tp_ops = tcf_proto_lookup_ops(kind); | |
250 | /* We dropped the RTNL semaphore in order to | |
251 | * perform the module load. So, even if we | |
252 | * succeeded in loading the module we have to | |
253 | * replay the request. We indicate this using | |
254 | * -EAGAIN. | |
255 | */ | |
256 | if (tp_ops != NULL) { | |
257 | module_put(tp_ops->owner); | |
258 | err = -EAGAIN; | |
259 | } | |
260 | } | |
261 | #endif | |
262 | kfree(tp); | |
263 | goto errout; | |
264 | } | |
1da177e4 LT |
265 | tp->ops = tp_ops; |
266 | tp->protocol = protocol; | |
d0ab8ff8 | 267 | tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back)); |
1da177e4 LT |
268 | tp->q = q; |
269 | tp->classify = tp_ops->classify; | |
270 | tp->classid = parent; | |
aa767bfe SH |
271 | |
272 | err = tp_ops->init(tp); | |
273 | if (err != 0) { | |
1da177e4 LT |
274 | module_put(tp_ops->owner); |
275 | kfree(tp); | |
276 | goto errout; | |
277 | } | |
278 | ||
12186be7 | 279 | tp_created = 1; |
1da177e4 | 280 | |
add93b61 | 281 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
1da177e4 LT |
282 | goto errout; |
283 | ||
284 | fh = tp->ops->get(tp, t->tcm_handle); | |
285 | ||
286 | if (fh == 0) { | |
287 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
55dbc640 | 288 | spin_lock_bh(root_lock); |
1da177e4 | 289 | *back = tp->next; |
323c0488 | 290 | spin_unlock_bh(root_lock); |
1da177e4 | 291 | |
7316ae88 | 292 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
293 | tcf_destroy(tp); |
294 | err = 0; | |
295 | goto errout; | |
296 | } | |
297 | ||
298 | err = -ENOENT; | |
aa767bfe SH |
299 | if (n->nlmsg_type != RTM_NEWTFILTER || |
300 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
301 | goto errout; |
302 | } else { | |
303 | switch (n->nlmsg_type) { | |
10297b99 | 304 | case RTM_NEWTFILTER: |
1da177e4 | 305 | err = -EEXIST; |
12186be7 MU |
306 | if (n->nlmsg_flags & NLM_F_EXCL) { |
307 | if (tp_created) | |
308 | tcf_destroy(tp); | |
1da177e4 | 309 | goto errout; |
12186be7 | 310 | } |
1da177e4 LT |
311 | break; |
312 | case RTM_DELTFILTER: | |
313 | err = tp->ops->delete(tp, fh); | |
314 | if (err == 0) | |
7316ae88 | 315 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
316 | goto errout; |
317 | case RTM_GETTFILTER: | |
7316ae88 | 318 | err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
1da177e4 LT |
319 | goto errout; |
320 | default: | |
321 | err = -EINVAL; | |
322 | goto errout; | |
323 | } | |
324 | } | |
325 | ||
c1b52739 | 326 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh); |
12186be7 MU |
327 | if (err == 0) { |
328 | if (tp_created) { | |
329 | spin_lock_bh(root_lock); | |
330 | tp->next = *back; | |
331 | *back = tp; | |
332 | spin_unlock_bh(root_lock); | |
333 | } | |
7316ae88 | 334 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
12186be7 MU |
335 | } else { |
336 | if (tp_created) | |
337 | tcf_destroy(tp); | |
338 | } | |
1da177e4 LT |
339 | |
340 | errout: | |
341 | if (cl) | |
342 | cops->put(q, cl); | |
343 | if (err == -EAGAIN) | |
344 | /* Replay the request. */ | |
345 | goto replay; | |
346 | return err; | |
347 | } | |
348 | ||
aa767bfe | 349 | static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, |
15e47304 | 350 | unsigned long fh, u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
351 | { |
352 | struct tcmsg *tcm; | |
353 | struct nlmsghdr *nlh; | |
27a884dc | 354 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 355 | |
15e47304 | 356 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
357 | if (!nlh) |
358 | goto out_nlmsg_trim; | |
359 | tcm = nlmsg_data(nlh); | |
1da177e4 | 360 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 361 | tcm->tcm__pad1 = 0; |
ad61df91 | 362 | tcm->tcm__pad2 = 0; |
5ce2d488 | 363 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
364 | tcm->tcm_parent = tp->classid; |
365 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
366 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
367 | goto nla_put_failure; | |
1da177e4 LT |
368 | tcm->tcm_handle = fh; |
369 | if (RTM_DELTFILTER != event) { | |
370 | tcm->tcm_handle = 0; | |
371 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) | |
add93b61 | 372 | goto nla_put_failure; |
1da177e4 | 373 | } |
27a884dc | 374 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
375 | return skb->len; |
376 | ||
942b8165 | 377 | out_nlmsg_trim: |
add93b61 | 378 | nla_put_failure: |
dc5fc579 | 379 | nlmsg_trim(skb, b); |
1da177e4 LT |
380 | return -1; |
381 | } | |
382 | ||
7316ae88 TG |
383 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
384 | struct nlmsghdr *n, struct tcf_proto *tp, | |
385 | unsigned long fh, int event) | |
1da177e4 LT |
386 | { |
387 | struct sk_buff *skb; | |
15e47304 | 388 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
389 | |
390 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
391 | if (!skb) | |
392 | return -ENOBUFS; | |
393 | ||
15e47304 | 394 | if (tcf_fill_node(skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) { |
1da177e4 LT |
395 | kfree_skb(skb); |
396 | return -EINVAL; | |
397 | } | |
398 | ||
15e47304 | 399 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 400 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
401 | } |
402 | ||
aa767bfe | 403 | struct tcf_dump_args { |
1da177e4 LT |
404 | struct tcf_walker w; |
405 | struct sk_buff *skb; | |
406 | struct netlink_callback *cb; | |
407 | }; | |
408 | ||
aa767bfe SH |
409 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
410 | struct tcf_walker *arg) | |
1da177e4 | 411 | { |
aa767bfe | 412 | struct tcf_dump_args *a = (void *)arg; |
1da177e4 | 413 | |
15e47304 | 414 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
415 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
416 | } | |
417 | ||
bd27a875 | 418 | /* called with RTNL */ |
1da177e4 LT |
419 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
420 | { | |
3b1e0a65 | 421 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
422 | int t; |
423 | int s_t; | |
424 | struct net_device *dev; | |
425 | struct Qdisc *q; | |
426 | struct tcf_proto *tp, **chain; | |
942b8165 | 427 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 428 | unsigned long cl = 0; |
20fea08b | 429 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
430 | struct tcf_dump_args arg; |
431 | ||
573ce260 | 432 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 433 | return skb->len; |
cc7ec456 ED |
434 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
435 | if (!dev) | |
1da177e4 LT |
436 | return skb->len; |
437 | ||
1da177e4 | 438 | if (!tcm->tcm_parent) |
af356afa | 439 | q = dev->qdisc; |
1da177e4 LT |
440 | else |
441 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
442 | if (!q) | |
443 | goto out; | |
cc7ec456 ED |
444 | cops = q->ops->cl_ops; |
445 | if (!cops) | |
1da177e4 | 446 | goto errout; |
71ebe5e9 PM |
447 | if (cops->tcf_chain == NULL) |
448 | goto errout; | |
1da177e4 LT |
449 | if (TC_H_MIN(tcm->tcm_parent)) { |
450 | cl = cops->get(q, tcm->tcm_parent); | |
451 | if (cl == 0) | |
452 | goto errout; | |
453 | } | |
454 | chain = cops->tcf_chain(q, cl); | |
455 | if (chain == NULL) | |
456 | goto errout; | |
457 | ||
458 | s_t = cb->args[0]; | |
459 | ||
cc7ec456 ED |
460 | for (tp = *chain, t = 0; tp; tp = tp->next, t++) { |
461 | if (t < s_t) | |
462 | continue; | |
1da177e4 LT |
463 | if (TC_H_MAJ(tcm->tcm_info) && |
464 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
465 | continue; | |
466 | if (TC_H_MIN(tcm->tcm_info) && | |
467 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
468 | continue; | |
469 | if (t > s_t) | |
470 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
471 | if (cb->args[1] == 0) { | |
15e47304 | 472 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).portid, |
aa767bfe SH |
473 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
474 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 475 | break; |
aa767bfe | 476 | |
1da177e4 LT |
477 | cb->args[1] = 1; |
478 | } | |
479 | if (tp->ops->walk == NULL) | |
480 | continue; | |
481 | arg.w.fn = tcf_node_dump; | |
482 | arg.skb = skb; | |
483 | arg.cb = cb; | |
484 | arg.w.stop = 0; | |
cc7ec456 | 485 | arg.w.skip = cb->args[1] - 1; |
1da177e4 LT |
486 | arg.w.count = 0; |
487 | tp->ops->walk(tp, &arg.w); | |
cc7ec456 | 488 | cb->args[1] = arg.w.count + 1; |
1da177e4 LT |
489 | if (arg.w.stop) |
490 | break; | |
491 | } | |
492 | ||
493 | cb->args[0] = t; | |
494 | ||
495 | errout: | |
496 | if (cl) | |
497 | cops->put(q, cl); | |
498 | out: | |
1da177e4 LT |
499 | return skb->len; |
500 | } | |
501 | ||
aa767bfe | 502 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
1da177e4 LT |
503 | { |
504 | #ifdef CONFIG_NET_CLS_ACT | |
505 | if (exts->action) { | |
506 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); | |
507 | exts->action = NULL; | |
508 | } | |
1da177e4 LT |
509 | #endif |
510 | } | |
aa767bfe | 511 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 512 | |
c1b52739 | 513 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
add93b61 | 514 | struct nlattr *rate_tlv, struct tcf_exts *exts, |
5239008b | 515 | const struct tcf_ext_map *map) |
1da177e4 LT |
516 | { |
517 | memset(exts, 0, sizeof(*exts)); | |
10297b99 | 518 | |
1da177e4 LT |
519 | #ifdef CONFIG_NET_CLS_ACT |
520 | { | |
1da177e4 LT |
521 | struct tc_action *act; |
522 | ||
add93b61 | 523 | if (map->police && tb[map->police]) { |
c1b52739 | 524 | act = tcf_action_init_1(net, tb[map->police], rate_tlv, |
aa767bfe | 525 | "police", TCA_ACT_NOREPLACE, |
ab27cfb8 PM |
526 | TCA_ACT_BIND); |
527 | if (IS_ERR(act)) | |
528 | return PTR_ERR(act); | |
1da177e4 LT |
529 | |
530 | act->type = TCA_OLD_COMPAT; | |
531 | exts->action = act; | |
add93b61 | 532 | } else if (map->action && tb[map->action]) { |
c1b52739 BL |
533 | act = tcf_action_init(net, tb[map->action], rate_tlv, |
534 | NULL, TCA_ACT_NOREPLACE, | |
535 | TCA_ACT_BIND); | |
ab27cfb8 PM |
536 | if (IS_ERR(act)) |
537 | return PTR_ERR(act); | |
1da177e4 LT |
538 | |
539 | exts->action = act; | |
540 | } | |
541 | } | |
1da177e4 | 542 | #else |
add93b61 PM |
543 | if ((map->action && tb[map->action]) || |
544 | (map->police && tb[map->police])) | |
1da177e4 LT |
545 | return -EOPNOTSUPP; |
546 | #endif | |
547 | ||
548 | return 0; | |
549 | } | |
aa767bfe | 550 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 551 | |
aa767bfe SH |
552 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
553 | struct tcf_exts *src) | |
1da177e4 LT |
554 | { |
555 | #ifdef CONFIG_NET_CLS_ACT | |
556 | if (src->action) { | |
557 | struct tc_action *act; | |
558 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
559 | act = dst->action; |
560 | dst->action = src->action; | |
1da177e4 LT |
561 | tcf_tree_unlock(tp); |
562 | if (act) | |
563 | tcf_action_destroy(act, TCA_ACT_UNBIND); | |
564 | } | |
1da177e4 LT |
565 | #endif |
566 | } | |
aa767bfe | 567 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 568 | |
aa767bfe | 569 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 570 | const struct tcf_ext_map *map) |
1da177e4 LT |
571 | { |
572 | #ifdef CONFIG_NET_CLS_ACT | |
573 | if (map->action && exts->action) { | |
574 | /* | |
575 | * again for backward compatible mode - we want | |
576 | * to work with both old and new modes of entering | |
577 | * tc data even if iproute2 was newer - jhs | |
578 | */ | |
4b3550ef | 579 | struct nlattr *nest; |
1da177e4 LT |
580 | |
581 | if (exts->action->type != TCA_OLD_COMPAT) { | |
4b3550ef PM |
582 | nest = nla_nest_start(skb, map->action); |
583 | if (nest == NULL) | |
584 | goto nla_put_failure; | |
1da177e4 | 585 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
add93b61 | 586 | goto nla_put_failure; |
4b3550ef | 587 | nla_nest_end(skb, nest); |
1da177e4 | 588 | } else if (map->police) { |
4b3550ef PM |
589 | nest = nla_nest_start(skb, map->police); |
590 | if (nest == NULL) | |
591 | goto nla_put_failure; | |
1da177e4 | 592 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
add93b61 | 593 | goto nla_put_failure; |
4b3550ef | 594 | nla_nest_end(skb, nest); |
1da177e4 LT |
595 | } |
596 | } | |
1da177e4 LT |
597 | #endif |
598 | return 0; | |
add93b61 | 599 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
600 | return -1; |
601 | } | |
aa767bfe | 602 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 603 | |
aa767bfe SH |
604 | |
605 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 606 | const struct tcf_ext_map *map) |
1da177e4 LT |
607 | { |
608 | #ifdef CONFIG_NET_CLS_ACT | |
609 | if (exts->action) | |
610 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) | |
add93b61 | 611 | goto nla_put_failure; |
1da177e4 LT |
612 | #endif |
613 | return 0; | |
add93b61 | 614 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
615 | return -1; |
616 | } | |
aa767bfe | 617 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 LT |
618 | |
619 | static int __init tc_filter_init(void) | |
620 | { | |
c7ac8679 GR |
621 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
622 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 623 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 624 | tc_dump_tfilter, NULL); |
1da177e4 | 625 | |
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | ||
629 | subsys_initcall(tc_filter_init); |