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 | 33 | /* The list of all installed classifier types */ |
36272874 | 34 | static LIST_HEAD(tcf_proto_base); |
1da177e4 LT |
35 | |
36 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
37 | static DEFINE_RWLOCK(cls_mod_lock); | |
38 | ||
39 | /* Find classifier type by string name */ | |
40 | ||
dc7f9f6e | 41 | static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) |
1da177e4 | 42 | { |
dcd76081 | 43 | const struct tcf_proto_ops *t, *res = NULL; |
1da177e4 LT |
44 | |
45 | if (kind) { | |
46 | read_lock(&cls_mod_lock); | |
36272874 | 47 | list_for_each_entry(t, &tcf_proto_base, head) { |
add93b61 | 48 | if (nla_strcmp(kind, t->kind) == 0) { |
dcd76081 ED |
49 | if (try_module_get(t->owner)) |
50 | res = t; | |
1da177e4 LT |
51 | break; |
52 | } | |
53 | } | |
54 | read_unlock(&cls_mod_lock); | |
55 | } | |
dcd76081 | 56 | return res; |
1da177e4 LT |
57 | } |
58 | ||
59 | /* Register(unregister) new classifier type */ | |
60 | ||
61 | int register_tcf_proto_ops(struct tcf_proto_ops *ops) | |
62 | { | |
36272874 | 63 | struct tcf_proto_ops *t; |
1da177e4 LT |
64 | int rc = -EEXIST; |
65 | ||
66 | write_lock(&cls_mod_lock); | |
36272874 | 67 | list_for_each_entry(t, &tcf_proto_base, head) |
1da177e4 LT |
68 | if (!strcmp(ops->kind, t->kind)) |
69 | goto out; | |
70 | ||
36272874 | 71 | list_add_tail(&ops->head, &tcf_proto_base); |
1da177e4 LT |
72 | rc = 0; |
73 | out: | |
74 | write_unlock(&cls_mod_lock); | |
75 | return rc; | |
76 | } | |
aa767bfe | 77 | EXPORT_SYMBOL(register_tcf_proto_ops); |
1da177e4 LT |
78 | |
79 | int unregister_tcf_proto_ops(struct tcf_proto_ops *ops) | |
80 | { | |
36272874 | 81 | struct tcf_proto_ops *t; |
1da177e4 LT |
82 | int rc = -ENOENT; |
83 | ||
84 | write_lock(&cls_mod_lock); | |
dcd76081 ED |
85 | list_for_each_entry(t, &tcf_proto_base, head) { |
86 | if (t == ops) { | |
87 | list_del(&t->head); | |
88 | rc = 0; | |
1da177e4 | 89 | break; |
dcd76081 ED |
90 | } |
91 | } | |
1da177e4 LT |
92 | write_unlock(&cls_mod_lock); |
93 | return rc; | |
94 | } | |
aa767bfe | 95 | EXPORT_SYMBOL(unregister_tcf_proto_ops); |
1da177e4 | 96 | |
7316ae88 TG |
97 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
98 | struct nlmsghdr *n, struct tcf_proto *tp, | |
99 | unsigned long fh, int event); | |
1da177e4 LT |
100 | |
101 | ||
102 | /* Select new prio value from the range, managed by kernel. */ | |
103 | ||
aa767bfe | 104 | static inline u32 tcf_auto_prio(struct tcf_proto *tp) |
1da177e4 | 105 | { |
aa767bfe | 106 | u32 first = TC_H_MAKE(0xC0000000U, 0U); |
1da177e4 LT |
107 | |
108 | if (tp) | |
cc7ec456 | 109 | first = tp->prio - 1; |
1da177e4 LT |
110 | |
111 | return first; | |
112 | } | |
113 | ||
114 | /* Add/change/delete/get a filter node */ | |
115 | ||
661d2967 | 116 | static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 117 | { |
3b1e0a65 | 118 | struct net *net = sock_net(skb->sk); |
add93b61 | 119 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
120 | struct tcmsg *t; |
121 | u32 protocol; | |
122 | u32 prio; | |
123 | u32 nprio; | |
124 | u32 parent; | |
125 | struct net_device *dev; | |
126 | struct Qdisc *q; | |
25d8c0d5 JF |
127 | struct tcf_proto __rcu **back; |
128 | struct tcf_proto __rcu **chain; | |
1da177e4 | 129 | struct tcf_proto *tp; |
dc7f9f6e | 130 | const struct tcf_proto_ops *tp_ops; |
20fea08b | 131 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
132 | unsigned long cl; |
133 | unsigned long fh; | |
134 | int err; | |
12186be7 | 135 | int tp_created = 0; |
1da177e4 | 136 | |
4e8bbb81 | 137 | if ((n->nlmsg_type != RTM_GETTFILTER) && |
5f013c9b | 138 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 | 139 | return -EPERM; |
de179c8c | 140 | |
1da177e4 | 141 | replay: |
de179c8c H |
142 | err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); |
143 | if (err < 0) | |
144 | return err; | |
145 | ||
942b8165 | 146 | t = nlmsg_data(n); |
1da177e4 LT |
147 | protocol = TC_H_MIN(t->tcm_info); |
148 | prio = TC_H_MAJ(t->tcm_info); | |
149 | nprio = prio; | |
150 | parent = t->tcm_parent; | |
151 | cl = 0; | |
152 | ||
153 | if (prio == 0) { | |
154 | /* If no priority is given, user wants we allocated it. */ | |
cc7ec456 ED |
155 | if (n->nlmsg_type != RTM_NEWTFILTER || |
156 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 | 157 | return -ENOENT; |
aa767bfe | 158 | prio = TC_H_MAKE(0x80000000U, 0U); |
1da177e4 LT |
159 | } |
160 | ||
161 | /* Find head of filter chain. */ | |
162 | ||
163 | /* Find link */ | |
7316ae88 | 164 | dev = __dev_get_by_index(net, t->tcm_ifindex); |
aa767bfe | 165 | if (dev == NULL) |
1da177e4 LT |
166 | return -ENODEV; |
167 | ||
168 | /* Find qdisc */ | |
169 | if (!parent) { | |
af356afa | 170 | q = dev->qdisc; |
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? */ | |
cc7ec456 ED |
179 | cops = q->ops->cl_ops; |
180 | if (!cops) | |
1da177e4 LT |
181 | return -EINVAL; |
182 | ||
71ebe5e9 PM |
183 | if (cops->tcf_chain == NULL) |
184 | return -EOPNOTSUPP; | |
185 | ||
1da177e4 LT |
186 | /* Do we search for filter, attached to class? */ |
187 | if (TC_H_MIN(parent)) { | |
188 | cl = cops->get(q, parent); | |
189 | if (cl == 0) | |
190 | return -ENOENT; | |
191 | } | |
192 | ||
193 | /* And the last stroke */ | |
194 | chain = cops->tcf_chain(q, cl); | |
195 | err = -EINVAL; | |
196 | if (chain == NULL) | |
197 | goto errout; | |
198 | ||
199 | /* Check the chain for existence of proto-tcf with this priority */ | |
25d8c0d5 JF |
200 | for (back = chain; |
201 | (tp = rtnl_dereference(*back)) != NULL; | |
202 | back = &tp->next) { | |
1da177e4 LT |
203 | if (tp->prio >= prio) { |
204 | if (tp->prio == prio) { | |
cc7ec456 ED |
205 | if (!nprio || |
206 | (tp->protocol != protocol && protocol)) | |
1da177e4 LT |
207 | goto errout; |
208 | } else | |
209 | tp = NULL; | |
210 | break; | |
211 | } | |
212 | } | |
213 | ||
214 | if (tp == NULL) { | |
215 | /* Proto-tcf does not exist, create new one */ | |
216 | ||
add93b61 | 217 | if (tca[TCA_KIND] == NULL || !protocol) |
1da177e4 LT |
218 | goto errout; |
219 | ||
220 | err = -ENOENT; | |
cc7ec456 ED |
221 | if (n->nlmsg_type != RTM_NEWTFILTER || |
222 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
223 | goto errout; |
224 | ||
225 | ||
226 | /* Create new proto tcf */ | |
227 | ||
228 | err = -ENOBUFS; | |
aa767bfe SH |
229 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); |
230 | if (tp == NULL) | |
1da177e4 | 231 | goto errout; |
f2df8249 | 232 | err = -ENOENT; |
add93b61 | 233 | tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]); |
1da177e4 | 234 | if (tp_ops == NULL) { |
95a5afca | 235 | #ifdef CONFIG_MODULES |
add93b61 | 236 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
237 | char name[IFNAMSIZ]; |
238 | ||
239 | if (kind != NULL && | |
add93b61 | 240 | nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
241 | rtnl_unlock(); |
242 | request_module("cls_%s", name); | |
243 | rtnl_lock(); | |
244 | tp_ops = tcf_proto_lookup_ops(kind); | |
245 | /* We dropped the RTNL semaphore in order to | |
246 | * perform the module load. So, even if we | |
247 | * succeeded in loading the module we have to | |
248 | * replay the request. We indicate this using | |
249 | * -EAGAIN. | |
250 | */ | |
251 | if (tp_ops != NULL) { | |
252 | module_put(tp_ops->owner); | |
253 | err = -EAGAIN; | |
254 | } | |
255 | } | |
256 | #endif | |
257 | kfree(tp); | |
258 | goto errout; | |
259 | } | |
1da177e4 LT |
260 | tp->ops = tp_ops; |
261 | tp->protocol = protocol; | |
25d8c0d5 JF |
262 | tp->prio = nprio ? : |
263 | TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back))); | |
1da177e4 LT |
264 | tp->q = q; |
265 | tp->classify = tp_ops->classify; | |
266 | tp->classid = parent; | |
aa767bfe SH |
267 | |
268 | err = tp_ops->init(tp); | |
269 | if (err != 0) { | |
1da177e4 LT |
270 | module_put(tp_ops->owner); |
271 | kfree(tp); | |
272 | goto errout; | |
273 | } | |
274 | ||
12186be7 | 275 | tp_created = 1; |
1da177e4 | 276 | |
add93b61 | 277 | } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) |
1da177e4 LT |
278 | goto errout; |
279 | ||
280 | fh = tp->ops->get(tp, t->tcm_handle); | |
281 | ||
282 | if (fh == 0) { | |
283 | if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) { | |
25d8c0d5 JF |
284 | struct tcf_proto *next = rtnl_dereference(tp->next); |
285 | ||
286 | RCU_INIT_POINTER(*back, next); | |
1da177e4 | 287 | |
7316ae88 | 288 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
289 | tcf_destroy(tp); |
290 | err = 0; | |
291 | goto errout; | |
292 | } | |
293 | ||
294 | err = -ENOENT; | |
aa767bfe SH |
295 | if (n->nlmsg_type != RTM_NEWTFILTER || |
296 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
297 | goto errout; |
298 | } else { | |
299 | switch (n->nlmsg_type) { | |
10297b99 | 300 | case RTM_NEWTFILTER: |
1da177e4 | 301 | err = -EEXIST; |
12186be7 MU |
302 | if (n->nlmsg_flags & NLM_F_EXCL) { |
303 | if (tp_created) | |
304 | tcf_destroy(tp); | |
1da177e4 | 305 | goto errout; |
12186be7 | 306 | } |
1da177e4 LT |
307 | break; |
308 | case RTM_DELTFILTER: | |
309 | err = tp->ops->delete(tp, fh); | |
310 | if (err == 0) | |
7316ae88 | 311 | tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER); |
1da177e4 LT |
312 | goto errout; |
313 | case RTM_GETTFILTER: | |
7316ae88 | 314 | err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
1da177e4 LT |
315 | goto errout; |
316 | default: | |
317 | err = -EINVAL; | |
318 | goto errout; | |
319 | } | |
320 | } | |
321 | ||
2f7ef2f8 CW |
322 | err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, |
323 | n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE); | |
12186be7 MU |
324 | if (err == 0) { |
325 | if (tp_created) { | |
25d8c0d5 JF |
326 | RCU_INIT_POINTER(tp->next, rtnl_dereference(*back)); |
327 | rcu_assign_pointer(*back, tp); | |
12186be7 | 328 | } |
7316ae88 | 329 | tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER); |
12186be7 MU |
330 | } else { |
331 | if (tp_created) | |
332 | tcf_destroy(tp); | |
333 | } | |
1da177e4 LT |
334 | |
335 | errout: | |
336 | if (cl) | |
337 | cops->put(q, cl); | |
338 | if (err == -EAGAIN) | |
339 | /* Replay the request. */ | |
340 | goto replay; | |
341 | return err; | |
342 | } | |
343 | ||
832d1d5b | 344 | static int tcf_fill_node(struct net *net, struct sk_buff *skb, struct tcf_proto *tp, |
15e47304 | 345 | unsigned long fh, u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
346 | { |
347 | struct tcmsg *tcm; | |
348 | struct nlmsghdr *nlh; | |
27a884dc | 349 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 350 | |
15e47304 | 351 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
942b8165 DM |
352 | if (!nlh) |
353 | goto out_nlmsg_trim; | |
354 | tcm = nlmsg_data(nlh); | |
1da177e4 | 355 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 | 356 | tcm->tcm__pad1 = 0; |
ad61df91 | 357 | tcm->tcm__pad2 = 0; |
5ce2d488 | 358 | tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex; |
1da177e4 LT |
359 | tcm->tcm_parent = tp->classid; |
360 | tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol); | |
1b34ec43 DM |
361 | if (nla_put_string(skb, TCA_KIND, tp->ops->kind)) |
362 | goto nla_put_failure; | |
1da177e4 LT |
363 | tcm->tcm_handle = fh; |
364 | if (RTM_DELTFILTER != event) { | |
365 | tcm->tcm_handle = 0; | |
832d1d5b | 366 | if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0) |
add93b61 | 367 | goto nla_put_failure; |
1da177e4 | 368 | } |
27a884dc | 369 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
370 | return skb->len; |
371 | ||
942b8165 | 372 | out_nlmsg_trim: |
add93b61 | 373 | nla_put_failure: |
dc5fc579 | 374 | nlmsg_trim(skb, b); |
1da177e4 LT |
375 | return -1; |
376 | } | |
377 | ||
7316ae88 TG |
378 | static int tfilter_notify(struct net *net, struct sk_buff *oskb, |
379 | struct nlmsghdr *n, struct tcf_proto *tp, | |
380 | unsigned long fh, int event) | |
1da177e4 LT |
381 | { |
382 | struct sk_buff *skb; | |
15e47304 | 383 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
384 | |
385 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
386 | if (!skb) | |
387 | return -ENOBUFS; | |
388 | ||
832d1d5b | 389 | if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) { |
1da177e4 LT |
390 | kfree_skb(skb); |
391 | return -EINVAL; | |
392 | } | |
393 | ||
15e47304 | 394 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
aa767bfe | 395 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
396 | } |
397 | ||
aa767bfe | 398 | struct tcf_dump_args { |
1da177e4 LT |
399 | struct tcf_walker w; |
400 | struct sk_buff *skb; | |
401 | struct netlink_callback *cb; | |
402 | }; | |
403 | ||
aa767bfe SH |
404 | static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, |
405 | struct tcf_walker *arg) | |
1da177e4 | 406 | { |
aa767bfe | 407 | struct tcf_dump_args *a = (void *)arg; |
832d1d5b | 408 | struct net *net = sock_net(a->skb->sk); |
1da177e4 | 409 | |
832d1d5b | 410 | return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
411 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER); |
412 | } | |
413 | ||
bd27a875 | 414 | /* called with RTNL */ |
1da177e4 LT |
415 | static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb) |
416 | { | |
3b1e0a65 | 417 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
418 | int t; |
419 | int s_t; | |
420 | struct net_device *dev; | |
421 | struct Qdisc *q; | |
25d8c0d5 | 422 | struct tcf_proto *tp, __rcu **chain; |
942b8165 | 423 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
1da177e4 | 424 | unsigned long cl = 0; |
20fea08b | 425 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
426 | struct tcf_dump_args arg; |
427 | ||
573ce260 | 428 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 429 | return skb->len; |
cc7ec456 ED |
430 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
431 | if (!dev) | |
1da177e4 LT |
432 | return skb->len; |
433 | ||
1da177e4 | 434 | if (!tcm->tcm_parent) |
af356afa | 435 | q = dev->qdisc; |
1da177e4 LT |
436 | else |
437 | q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent)); | |
438 | if (!q) | |
439 | goto out; | |
cc7ec456 ED |
440 | cops = q->ops->cl_ops; |
441 | if (!cops) | |
1da177e4 | 442 | goto errout; |
71ebe5e9 PM |
443 | if (cops->tcf_chain == NULL) |
444 | goto errout; | |
1da177e4 LT |
445 | if (TC_H_MIN(tcm->tcm_parent)) { |
446 | cl = cops->get(q, tcm->tcm_parent); | |
447 | if (cl == 0) | |
448 | goto errout; | |
449 | } | |
450 | chain = cops->tcf_chain(q, cl); | |
451 | if (chain == NULL) | |
452 | goto errout; | |
453 | ||
454 | s_t = cb->args[0]; | |
455 | ||
25d8c0d5 JF |
456 | for (tp = rtnl_dereference(*chain), t = 0; |
457 | tp; tp = rtnl_dereference(tp->next), t++) { | |
cc7ec456 ED |
458 | if (t < s_t) |
459 | continue; | |
1da177e4 LT |
460 | if (TC_H_MAJ(tcm->tcm_info) && |
461 | TC_H_MAJ(tcm->tcm_info) != tp->prio) | |
462 | continue; | |
463 | if (TC_H_MIN(tcm->tcm_info) && | |
464 | TC_H_MIN(tcm->tcm_info) != tp->protocol) | |
465 | continue; | |
466 | if (t > s_t) | |
467 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
468 | if (cb->args[1] == 0) { | |
832d1d5b | 469 | if (tcf_fill_node(net, skb, tp, 0, NETLINK_CB(cb->skb).portid, |
aa767bfe SH |
470 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
471 | RTM_NEWTFILTER) <= 0) | |
1da177e4 | 472 | break; |
aa767bfe | 473 | |
1da177e4 LT |
474 | cb->args[1] = 1; |
475 | } | |
476 | if (tp->ops->walk == NULL) | |
477 | continue; | |
478 | arg.w.fn = tcf_node_dump; | |
479 | arg.skb = skb; | |
480 | arg.cb = cb; | |
481 | arg.w.stop = 0; | |
cc7ec456 | 482 | arg.w.skip = cb->args[1] - 1; |
1da177e4 LT |
483 | arg.w.count = 0; |
484 | tp->ops->walk(tp, &arg.w); | |
cc7ec456 | 485 | cb->args[1] = arg.w.count + 1; |
1da177e4 LT |
486 | if (arg.w.stop) |
487 | break; | |
488 | } | |
489 | ||
490 | cb->args[0] = t; | |
491 | ||
492 | errout: | |
493 | if (cl) | |
494 | cops->put(q, cl); | |
495 | out: | |
1da177e4 LT |
496 | return skb->len; |
497 | } | |
498 | ||
18d0264f | 499 | void tcf_exts_destroy(struct tcf_exts *exts) |
1da177e4 LT |
500 | { |
501 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 WC |
502 | tcf_action_destroy(&exts->actions, TCA_ACT_UNBIND); |
503 | INIT_LIST_HEAD(&exts->actions); | |
1da177e4 LT |
504 | #endif |
505 | } | |
aa767bfe | 506 | EXPORT_SYMBOL(tcf_exts_destroy); |
1da177e4 | 507 | |
c1b52739 | 508 | int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, |
2f7ef2f8 | 509 | struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr) |
1da177e4 | 510 | { |
1da177e4 LT |
511 | #ifdef CONFIG_NET_CLS_ACT |
512 | { | |
1da177e4 LT |
513 | struct tc_action *act; |
514 | ||
33be6271 | 515 | INIT_LIST_HEAD(&exts->actions); |
5da57f42 WC |
516 | if (exts->police && tb[exts->police]) { |
517 | act = tcf_action_init_1(net, tb[exts->police], rate_tlv, | |
2f7ef2f8 | 518 | "police", ovr, |
ab27cfb8 PM |
519 | TCA_ACT_BIND); |
520 | if (IS_ERR(act)) | |
521 | return PTR_ERR(act); | |
1da177e4 | 522 | |
33be6271 WC |
523 | act->type = exts->type = TCA_OLD_COMPAT; |
524 | list_add(&act->list, &exts->actions); | |
5da57f42 | 525 | } else if (exts->action && tb[exts->action]) { |
33be6271 | 526 | int err; |
5da57f42 | 527 | err = tcf_action_init(net, tb[exts->action], rate_tlv, |
2f7ef2f8 | 528 | NULL, ovr, |
33be6271 WC |
529 | TCA_ACT_BIND, &exts->actions); |
530 | if (err) | |
531 | return err; | |
1da177e4 LT |
532 | } |
533 | } | |
1da177e4 | 534 | #else |
5da57f42 WC |
535 | if ((exts->action && tb[exts->action]) || |
536 | (exts->police && tb[exts->police])) | |
1da177e4 LT |
537 | return -EOPNOTSUPP; |
538 | #endif | |
539 | ||
540 | return 0; | |
541 | } | |
aa767bfe | 542 | EXPORT_SYMBOL(tcf_exts_validate); |
1da177e4 | 543 | |
aa767bfe SH |
544 | void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst, |
545 | struct tcf_exts *src) | |
1da177e4 LT |
546 | { |
547 | #ifdef CONFIG_NET_CLS_ACT | |
a49eb42a CW |
548 | LIST_HEAD(tmp); |
549 | tcf_tree_lock(tp); | |
550 | list_splice_init(&dst->actions, &tmp); | |
551 | list_splice(&src->actions, &dst->actions); | |
5301e3e1 | 552 | dst->type = src->type; |
a49eb42a CW |
553 | tcf_tree_unlock(tp); |
554 | tcf_action_destroy(&tmp, TCA_ACT_UNBIND); | |
1da177e4 LT |
555 | #endif |
556 | } | |
aa767bfe | 557 | EXPORT_SYMBOL(tcf_exts_change); |
1da177e4 | 558 | |
33be6271 WC |
559 | #define tcf_exts_first_act(ext) \ |
560 | list_first_entry(&(exts)->actions, struct tc_action, list) | |
561 | ||
5da57f42 | 562 | int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
563 | { |
564 | #ifdef CONFIG_NET_CLS_ACT | |
9cc63db5 CW |
565 | struct nlattr *nest; |
566 | ||
5da57f42 | 567 | if (exts->action && !list_empty(&exts->actions)) { |
1da177e4 LT |
568 | /* |
569 | * again for backward compatible mode - we want | |
570 | * to work with both old and new modes of entering | |
571 | * tc data even if iproute2 was newer - jhs | |
572 | */ | |
33be6271 | 573 | if (exts->type != TCA_OLD_COMPAT) { |
5da57f42 | 574 | nest = nla_nest_start(skb, exts->action); |
4b3550ef PM |
575 | if (nest == NULL) |
576 | goto nla_put_failure; | |
33be6271 | 577 | if (tcf_action_dump(skb, &exts->actions, 0, 0) < 0) |
add93b61 | 578 | goto nla_put_failure; |
4b3550ef | 579 | nla_nest_end(skb, nest); |
5da57f42 | 580 | } else if (exts->police) { |
33be6271 | 581 | struct tc_action *act = tcf_exts_first_act(exts); |
5da57f42 | 582 | nest = nla_nest_start(skb, exts->police); |
63acd680 | 583 | if (nest == NULL || !act) |
4b3550ef | 584 | goto nla_put_failure; |
33be6271 | 585 | if (tcf_action_dump_old(skb, act, 0, 0) < 0) |
add93b61 | 586 | goto nla_put_failure; |
4b3550ef | 587 | nla_nest_end(skb, nest); |
1da177e4 LT |
588 | } |
589 | } | |
1da177e4 | 590 | return 0; |
9cc63db5 CW |
591 | |
592 | nla_put_failure: | |
593 | nla_nest_cancel(skb, nest); | |
1da177e4 | 594 | return -1; |
9cc63db5 CW |
595 | #else |
596 | return 0; | |
597 | #endif | |
1da177e4 | 598 | } |
aa767bfe | 599 | EXPORT_SYMBOL(tcf_exts_dump); |
1da177e4 | 600 | |
aa767bfe | 601 | |
5da57f42 | 602 | int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts) |
1da177e4 LT |
603 | { |
604 | #ifdef CONFIG_NET_CLS_ACT | |
33be6271 WC |
605 | struct tc_action *a = tcf_exts_first_act(exts); |
606 | if (tcf_action_copy_stats(skb, a, 1) < 0) | |
607 | return -1; | |
1da177e4 LT |
608 | #endif |
609 | return 0; | |
1da177e4 | 610 | } |
aa767bfe | 611 | EXPORT_SYMBOL(tcf_exts_dump_stats); |
1da177e4 LT |
612 | |
613 | static int __init tc_filter_init(void) | |
614 | { | |
c7ac8679 GR |
615 | rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL); |
616 | rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL); | |
82623c0d | 617 | rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter, |
c7ac8679 | 618 | tc_dump_tfilter, NULL); |
1da177e4 | 619 | |
1da177e4 LT |
620 | return 0; |
621 | } | |
622 | ||
623 | subsys_initcall(tc_filter_init); |