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> | |
dc5fc579 | 25 | #include <linux/netlink.h> |
ab27cfb8 | 26 | #include <linux/err.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 | ||
add93b61 | 42 | static struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
43 | { |
44 | struct tcf_proto_ops *t = NULL; | |
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); | |
87 | for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next) | |
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 LT |
100 | |
101 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
102 | struct tcf_proto *tp, unsigned long fh, int event); | |
103 | ||
104 | ||
105 | /* Select new prio value from the range, managed by kernel. */ | |
106 | ||
aa767bfe | 107 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 108 | { |
aa767bfe | 109 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
110 | |
111 | if (tp) | |
112 | first = tp->prio-1; | |
113 | ||
114 | return first; | |
115 | } | |
116 | ||
117 | /* Add/change/delete/get a filter node */ | |
118 | ||
119 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
120 | { | |
3b1e0a65 | 121 | struct net *net = sock_net(skb->sk); |
add93b61 | 122 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
123 | struct tcmsg *t; |
124 | u32 protocol; | |
125 | u32 prio; | |
126 | u32 nprio; | |
127 | u32 parent; | |
128 | struct net_device *dev; | |
129 | struct Qdisc *q; | |
130 | struct tcf_proto **back, **chain; | |
131 | struct tcf_proto *tp; | |
132 | struct tcf_proto_ops *tp_ops; | |
20fea08b | 133 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
134 | unsigned long cl; |
135 | unsigned long fh; | |
136 | int err; | |
137 | ||
b854272b DL |
138 | if (net != &init_net) |
139 | return -EINVAL; | |
140 | ||
1da177e4 | 141 | replay: |
1da177e4 LT |
142 | t = NLMSG_DATA(n); |
143 | protocol = TC_H_MIN(t->tcm_info); | |
144 | prio = TC_H_MAJ(t->tcm_info); | |
145 | nprio = prio; | |
146 | parent = t->tcm_parent; | |
147 | cl = 0; | |
148 | ||
149 | if (prio == 0) { | |
150 | /* If no priority is given, user wants we allocated it. */ | |
151 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) | |
152 | return -ENOENT; | |
aa767bfe | 153 | prio = TC_H_MAKE(0x80000000U, 0U); |
1da177e4 LT |
154 | } |
155 | ||
156 | /* Find head of filter chain. */ | |
157 | ||
158 | /* Find link */ | |
aa767bfe SH |
159 | dev = __dev_get_by_index(&init_net, t->tcm_ifindex); |
160 | if (dev == NULL) | |
1da177e4 LT |
161 | return -ENODEV; |
162 | ||
add93b61 PM |
163 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
164 | if (err < 0) | |
165 | return err; | |
166 | ||
1da177e4 LT |
167 | /* Find qdisc */ |
168 | if (!parent) { | |
e8a0464c | 169 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0); |
b0e1e646 | 170 | q = dev_queue->qdisc_sleeping; |
1da177e4 | 171 | parent = q->handle; |
aa767bfe SH |
172 | } else { |
173 | q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent)); | |
174 | if (q == NULL) | |
175 | return -EINVAL; | |
176 | } | |
1da177e4 LT |
177 | |
178 | /* Is it classful? */ | |
179 | if ((cops = q->ops->cl_ops) == NULL) | |
180 | return -EINVAL; | |
181 | ||
182 | /* Do we search for filter, attached to class? */ | |
183 | if (TC_H_MIN(parent)) { | |
184 | cl = cops->get(q, parent); | |
185 | if (cl == 0) | |
186 | return -ENOENT; | |
187 | } | |
188 | ||
189 | /* And the last stroke */ | |
190 | chain = cops->tcf_chain(q, cl); | |
191 | err = -EINVAL; | |
192 | if (chain == NULL) | |
193 | goto errout; | |
194 | ||
195 | /* Check the chain for existence of proto-tcf with this priority */ | |
196 | for (back = chain; (tp=*back) != NULL; back = &tp->next) { | |
197 | if (tp->prio >= prio) { | |
198 | if (tp->prio == prio) { | |
199 | if (!nprio || (tp->protocol != protocol && protocol)) | |
200 | goto errout; | |
201 | } else | |
202 | tp = NULL; | |
203 | break; | |
204 | } | |
205 | } | |
206 | ||
207 | if (tp == NULL) { | |
208 | /* Proto-tcf does not exist, create new one */ | |
209 | ||
add93b61 | 210 | if (tca[TCA_KIND] == NULL || !protocol) |
1da177e4 LT |
211 | goto errout; |
212 | ||
213 | err = -ENOENT; | |
214 | if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE)) | |
215 | goto errout; | |
216 | ||
217 | ||
218 | /* Create new proto tcf */ | |
219 | ||
220 | err = -ENOBUFS; | |
aa767bfe SH |
221 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
222 | if (tp == NULL) | |
1da177e4 | 223 | goto errout; |
f2df8249 | 224 | err = -ENOENT; |
add93b61 | 225 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
1da177e4 LT |
226 | if (tp_ops == NULL) { |
227 | #ifdef CONFIG_KMOD | |
add93b61 | 228 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
229 | char name[IFNAMSIZ]; |
230 | ||
231 | if (kind != NULL && | |
add93b61 | 232 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
233 | rtnl_unlock(); |
234 | request_module("cls_%s", name); | |
235 | rtnl_lock(); | |
236 | tp_ops = tcf_proto_lookup_ops(kind); | |
237 | /* We dropped the RTNL semaphore in order to | |
238 | * perform the module load. So, even if we | |
239 | * succeeded in loading the module we have to | |
240 | * replay the request. We indicate this using | |
241 | * -EAGAIN. | |
242 | */ | |
243 | if (tp_ops != NULL) { | |
244 | module_put(tp_ops->owner); | |
245 | err = -EAGAIN; | |
246 | } | |
247 | } | |
248 | #endif | |
249 | kfree(tp); | |
250 | goto errout; | |
251 | } | |
1da177e4 LT |
252 | tp->ops = tp_ops; |
253 | tp->protocol = protocol; | |
254 | tp->prio = nprio ? : tcf_auto_prio(*back); | |
255 | tp->q = q; | |
256 | tp->classify = tp_ops->classify; | |
257 | tp->classid = parent; | |
aa767bfe SH |
258 | |
259 | err = tp_ops->init(tp); | |
260 | if (err != 0) { | |
1da177e4 LT |
261 | module_put(tp_ops->owner); |
262 | kfree(tp); | |
263 | goto errout; | |
264 | } | |
265 | ||
266 | qdisc_lock_tree(dev); | |
267 | tp->next = *back; | |
268 | *back = tp; | |
269 | qdisc_unlock_tree(dev); | |
270 | ||
add93b61 | 271 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
1da177e4 LT |
272 | goto errout; |
273 | ||
274 | fh = tp->ops->get(tp, t->tcm_handle); | |
275 | ||
276 | if (fh == 0) { | |
277 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
278 | qdisc_lock_tree(dev); | |
279 | *back = tp->next; | |
280 | qdisc_unlock_tree(dev); | |
281 | ||
282 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); | |
283 | tcf_destroy(tp); | |
284 | err = 0; | |
285 | goto errout; | |
286 | } | |
287 | ||
288 | err = -ENOENT; | |
aa767bfe SH |
289 | if (n->nlmsg_type != RTM_NEWTFILTER || |
290 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
291 | goto errout; |
292 | } else { | |
293 | switch (n->nlmsg_type) { | |
10297b99 | 294 | case RTM_NEWTFILTER: |
1da177e4 | 295 | err = -EEXIST; |
aa767bfe | 296 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
297 | goto errout; |
298 | break; | |
299 | case RTM_DELTFILTER: | |
300 | err = tp->ops->delete(tp, fh); | |
301 | if (err == 0) | |
302 | tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER); | |
303 | goto errout; | |
304 | case RTM_GETTFILTER: | |
305 | err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); | |
306 | goto errout; | |
307 | default: | |
308 | err = -EINVAL; | |
309 | goto errout; | |
310 | } | |
311 | } | |
312 | ||
313 | err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh); | |
314 | if (err == 0) | |
315 | tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER); | |
316 | ||
317 | errout: | |
318 | if (cl) | |
319 | cops->put(q, cl); | |
320 | if (err == -EAGAIN) | |
321 | /* Replay the request. */ | |
322 | goto replay; | |
323 | return err; | |
324 | } | |
325 | ||
aa767bfe SH |
326 | static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, |
327 | unsigned long fh, u32 pid, u32 seq, u16 flags, int event) | |
1da177e4 LT |
328 | { |
329 | struct tcmsg *tcm; | |
330 | struct nlmsghdr *nlh; | |
27a884dc | 331 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 332 | |
e431b8c0 | 333 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
334 | tcm = NLMSG_DATA(nlh); |
335 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
336 | tcm->tcm__pad1 = 0; |
337 | tcm->tcm__pad1 = 0; | |
5ce2d488 | 338 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
339 | tcm->tcm_parent = tp->classid; |
340 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
57e1c487 | 341 | NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind); |
1da177e4 LT |
342 | tcm->tcm_handle = fh; |
343 | if (RTM_DELTFILTER != event) { | |
344 | tcm->tcm_handle = 0; | |
345 | if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0) | |
add93b61 | 346 | goto nla_put_failure; |
1da177e4 | 347 | } |
27a884dc | 348 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
349 | return skb->len; |
350 | ||
351 | nlmsg_failure: | |
add93b61 | 352 | nla_put_failure: |
dc5fc579 | 353 | nlmsg_trim(skb, b); |
1da177e4 LT |
354 | return -1; |
355 | } | |
356 | ||
357 | static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
358 | struct tcf_proto *tp, unsigned long fh, int event) | |
359 | { | |
360 | struct sk_buff *skb; | |
361 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
362 | ||
363 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
364 | if (!skb) | |
365 | return -ENOBUFS; | |
366 | ||
367 | if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) { | |
368 | kfree_skb(skb); | |
369 | return -EINVAL; | |
370 | } | |
371 | ||
aa767bfe SH |
372 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, |
373 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
374 | } |
375 | ||
aa767bfe | 376 | struct tcf_dump_args { |
1da177e4 LT |
377 | struct tcf_walker w; |
378 | struct sk_buff *skb; | |
379 | struct netlink_callback *cb; | |
380 | }; | |
381 | ||
aa767bfe SH |
382 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
383 | struct tcf_walker *arg) | |
1da177e4 | 384 | { |
aa767bfe | 385 | struct tcf_dump_args *a = (void *)arg; |
1da177e4 LT |
386 | |
387 | return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid, | |
388 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); | |
389 | } | |
390 | ||
391 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) | |
392 | { | |
3b1e0a65 | 393 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 394 | struct netdev_queue *dev_queue; |
1da177e4 LT |
395 | int t; |
396 | int s_t; | |
397 | struct net_device *dev; | |
398 | struct Qdisc *q; | |
399 | struct tcf_proto *tp, **chain; | |
aa767bfe | 400 | struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh); |
1da177e4 | 401 | unsigned long cl = 0; |
20fea08b | 402 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
403 | struct tcf_dump_args arg; |
404 | ||
b854272b DL |
405 | if (net != &init_net) |
406 | return 0; | |
407 | ||
1da177e4 LT |
408 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
409 | return skb->len; | |
881d966b | 410 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
411 | return skb->len; |
412 | ||
e8a0464c | 413 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 | 414 | if (!tcm->tcm_parent) |
b0e1e646 | 415 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
416 | else |
417 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
418 | if (!q) | |
419 | goto out; | |
420 | if ((cops = q->ops->cl_ops) == NULL) | |
421 | goto errout; | |
422 | if (TC_H_MIN(tcm->tcm_parent)) { | |
423 | cl = cops->get(q, tcm->tcm_parent); | |
424 | if (cl == 0) | |
425 | goto errout; | |
426 | } | |
427 | chain = cops->tcf_chain(q, cl); | |
428 | if (chain == NULL) | |
429 | goto errout; | |
430 | ||
431 | s_t = cb->args[0]; | |
432 | ||
433 | for (tp=*chain, t=0; tp; tp = tp->next, t++) { | |
434 | if (t < s_t) continue; | |
435 | if (TC_H_MAJ(tcm->tcm_info) && | |
436 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
437 | continue; | |
438 | if (TC_H_MIN(tcm->tcm_info) && | |
439 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
440 | continue; | |
441 | if (t > s_t) | |
442 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
443 | if (cb->args[1] == 0) { | |
444 | if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid, | |
aa767bfe SH |
445 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
446 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 447 | break; |
aa767bfe | 448 | |
1da177e4 LT |
449 | cb->args[1] = 1; |
450 | } | |
451 | if (tp->ops->walk == NULL) | |
452 | continue; | |
453 | arg.w.fn = tcf_node_dump; | |
454 | arg.skb = skb; | |
455 | arg.cb = cb; | |
456 | arg.w.stop = 0; | |
457 | arg.w.skip = cb->args[1]-1; | |
458 | arg.w.count = 0; | |
459 | tp->ops->walk(tp, &arg.w); | |
460 | cb->args[1] = arg.w.count+1; | |
461 | if (arg.w.stop) | |
462 | break; | |
463 | } | |
464 | ||
465 | cb->args[0] = t; | |
466 | ||
467 | errout: | |
468 | if (cl) | |
469 | cops->put(q, cl); | |
470 | out: | |
1da177e4 LT |
471 | dev_put(dev); |
472 | return skb->len; | |
473 | } | |
474 | ||
aa767bfe | 475 | void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts) |
1da177e4 LT |
476 | { |
477 | #ifdef CONFIG_NET_CLS_ACT | |
478 | if (exts->action) { | |
479 | tcf_action_destroy(exts->action, TCA_ACT_UNBIND); | |
480 | exts->action = NULL; | |
481 | } | |
1da177e4 LT |
482 | #endif |
483 | } | |
aa767bfe | 484 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 485 | |
add93b61 PM |
486 | int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb, |
487 | struct nlattr *rate_tlv, struct tcf_exts *exts, | |
5239008b | 488 | const struct tcf_ext_map *map) |
1da177e4 LT |
489 | { |
490 | memset(exts, 0, sizeof(*exts)); | |
10297b99 | 491 | |
1da177e4 LT |
492 | #ifdef CONFIG_NET_CLS_ACT |
493 | { | |
1da177e4 LT |
494 | struct tc_action *act; |
495 | ||
add93b61 | 496 | if (map->police && tb[map->police]) { |
7ba699c6 | 497 | act = tcf_action_init_1(tb[map->police], rate_tlv, |
aa767bfe | 498 | "police", TCA_ACT_NOREPLACE, |
ab27cfb8 PM |
499 | TCA_ACT_BIND); |
500 | if (IS_ERR(act)) | |
501 | return PTR_ERR(act); | |
1da177e4 LT |
502 | |
503 | act->type = TCA_OLD_COMPAT; | |
504 | exts->action = act; | |
add93b61 | 505 | } else if (map->action && tb[map->action]) { |
7ba699c6 | 506 | act = tcf_action_init(tb[map->action], rate_tlv, NULL, |
ab27cfb8 PM |
507 | TCA_ACT_NOREPLACE, TCA_ACT_BIND); |
508 | if (IS_ERR(act)) | |
509 | return PTR_ERR(act); | |
1da177e4 LT |
510 | |
511 | exts->action = act; | |
512 | } | |
513 | } | |
1da177e4 | 514 | #else |
add93b61 PM |
515 | if ((map->action && tb[map->action]) || |
516 | (map->police && tb[map->police])) | |
1da177e4 LT |
517 | return -EOPNOTSUPP; |
518 | #endif | |
519 | ||
520 | return 0; | |
521 | } | |
aa767bfe | 522 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 523 | |
aa767bfe SH |
524 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
525 | struct tcf_exts *src) | |
1da177e4 LT |
526 | { |
527 | #ifdef CONFIG_NET_CLS_ACT | |
528 | if (src->action) { | |
529 | struct tc_action *act; | |
530 | tcf_tree_lock(tp); | |
531 | act = xchg(&dst->action, src->action); | |
532 | tcf_tree_unlock(tp); | |
533 | if (act) | |
534 | tcf_action_destroy(act, TCA_ACT_UNBIND); | |
535 | } | |
1da177e4 LT |
536 | #endif |
537 | } | |
aa767bfe | 538 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 539 | |
aa767bfe | 540 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts, |
5239008b | 541 | const struct tcf_ext_map *map) |
1da177e4 LT |
542 | { |
543 | #ifdef CONFIG_NET_CLS_ACT | |
544 | if (map->action && exts->action) { | |
545 | /* | |
546 | * again for backward compatible mode - we want | |
547 | * to work with both old and new modes of entering | |
548 | * tc data even if iproute2 was newer - jhs | |
549 | */ | |
4b3550ef | 550 | struct nlattr *nest; |
1da177e4 LT |
551 | |
552 | if (exts->action->type != TCA_OLD_COMPAT) { | |
4b3550ef PM |
553 | nest = nla_nest_start(skb, map->action); |
554 | if (nest == NULL) | |
555 | goto nla_put_failure; | |
1da177e4 | 556 | if (tcf_action_dump(skb, exts->action, 0, 0) < 0) |
add93b61 | 557 | goto nla_put_failure; |
4b3550ef | 558 | nla_nest_end(skb, nest); |
1da177e4 | 559 | } else if (map->police) { |
4b3550ef PM |
560 | nest = nla_nest_start(skb, map->police); |
561 | if (nest == NULL) | |
562 | goto nla_put_failure; | |
1da177e4 | 563 | if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0) |
add93b61 | 564 | goto nla_put_failure; |
4b3550ef | 565 | nla_nest_end(skb, nest); |
1da177e4 LT |
566 | } |
567 | } | |
1da177e4 LT |
568 | #endif |
569 | return 0; | |
add93b61 | 570 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
571 | return -1; |
572 | } | |
aa767bfe | 573 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 574 | |
aa767bfe SH |
575 | |
576 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts, | |
5239008b | 577 | const struct tcf_ext_map *map) |
1da177e4 LT |
578 | { |
579 | #ifdef CONFIG_NET_CLS_ACT | |
580 | if (exts->action) | |
581 | if (tcf_action_copy_stats(skb, exts->action, 1) < 0) | |
add93b61 | 582 | goto nla_put_failure; |
1da177e4 LT |
583 | #endif |
584 | return 0; | |
add93b61 | 585 | nla_put_failure: __attribute__ ((unused)) |
1da177e4 LT |
586 | return -1; |
587 | } | |
aa767bfe | 588 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 LT |
589 | |
590 | static int __init tc_filter_init(void) | |
591 | { | |
82623c0d TG |
592 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL); |
593 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL); | |
594 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, | |
595 | tc_dump_tfilter); | |
1da177e4 | 596 | |
1da177e4 LT |
597 | return 0; |
598 | } | |
599 | ||
600 | subsys_initcall(tc_filter_init); |