blob: 7cf6c0fbc7a6d930cf2affe67ab7dd930ec490f8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/init.h>
24#include <linux/kmod.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070025#include <linux/netlink.h>
Patrick McHardyab27cfb2008-01-23 20:33:13 -080026#include <linux/err.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110027#include <net/net_namespace.h>
28#include <net/sock.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070029#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <net/pkt_sched.h>
31#include <net/pkt_cls.h>
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033/* The list of all installed classifier types */
34
Patrick McHardy2eb9d752008-01-22 22:10:42 -080035static struct tcf_proto_ops *tcf_proto_base __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37/* Protects list of registered TC modules. It is pure SMP lock. */
38static DEFINE_RWLOCK(cls_mod_lock);
39
40/* Find classifier type by string name */
41
Patrick McHardyadd93b62008-01-22 22:11:33 -080042static struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
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) {
Patrick McHardyadd93b62008-01-22 22:11:33 -080049 if (nla_strcmp(kind, t->kind) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 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
62int 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;
75out:
76 write_unlock(&cls_mod_lock);
77 return rc;
78}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -080079EXPORT_SYMBOL(register_tcf_proto_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81int 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;
95out:
96 write_unlock(&cls_mod_lock);
97 return rc;
98}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -080099EXPORT_SYMBOL(unregister_tcf_proto_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101static 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
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800107static inline u32 tcf_auto_prio(struct tcf_proto *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800109 u32 first = TC_H_MAKE(0xC0000000U, 0U);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 if (tp)
112 first = tp->prio-1;
113
114 return first;
115}
116
117/* Add/change/delete/get a filter node */
118
119static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
120{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900121 struct net *net = sock_net(skb->sk);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800122 struct nlattr *tca[TCA_MAX + 1];
David S. Miller55dbc6402008-07-16 02:40:45 -0700123 spinlock_t *root_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 struct tcmsg *t;
125 u32 protocol;
126 u32 prio;
127 u32 nprio;
128 u32 parent;
129 struct net_device *dev;
130 struct Qdisc *q;
131 struct tcf_proto **back, **chain;
132 struct tcf_proto *tp;
133 struct tcf_proto_ops *tp_ops;
Eric Dumazet20fea082007-11-14 01:44:41 -0800134 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 unsigned long cl;
136 unsigned long fh;
137 int err;
Minoru Usui12186be2009-06-02 02:17:34 -0700138 int tp_created = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Denis V. Lunevb8542722007-12-01 00:21:31 +1100140 if (net != &init_net)
141 return -EINVAL;
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143replay:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 t = NLMSG_DATA(n);
145 protocol = TC_H_MIN(t->tcm_info);
146 prio = TC_H_MAJ(t->tcm_info);
147 nprio = prio;
148 parent = t->tcm_parent;
149 cl = 0;
150
151 if (prio == 0) {
152 /* If no priority is given, user wants we allocated it. */
153 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
154 return -ENOENT;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800155 prio = TC_H_MAKE(0x80000000U, 0U);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 }
157
158 /* Find head of filter chain. */
159
160 /* Find link */
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800161 dev = __dev_get_by_index(&init_net, t->tcm_ifindex);
162 if (dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 return -ENODEV;
164
Patrick McHardyadd93b62008-01-22 22:11:33 -0800165 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
166 if (err < 0)
167 return err;
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 /* Find qdisc */
170 if (!parent) {
Patrick McHardyaf356af2009-09-04 06:41:18 +0000171 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 parent = q->handle;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800173 } else {
174 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
175 if (q == NULL)
176 return -EINVAL;
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 /* Is it classful? */
180 if ((cops = q->ops->cl_ops) == NULL)
181 return -EINVAL;
182
Patrick McHardy71ebe5e2009-09-04 06:41:15 +0000183 if (cops->tcf_chain == NULL)
184 return -EOPNOTSUPP;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /* 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 */
200 for (back = chain; (tp=*back) != NULL; back = &tp->next) {
201 if (tp->prio >= prio) {
202 if (tp->prio == prio) {
203 if (!nprio || (tp->protocol != protocol && protocol))
204 goto errout;
205 } else
206 tp = NULL;
207 break;
208 }
209 }
210
Jarek Poplawski102396a2008-08-29 14:21:52 -0700211 root_lock = qdisc_root_sleeping_lock(q);
David S. Miller55dbc6402008-07-16 02:40:45 -0700212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 if (tp == NULL) {
214 /* Proto-tcf does not exist, create new one */
215
Patrick McHardyadd93b62008-01-22 22:11:33 -0800216 if (tca[TCA_KIND] == NULL || !protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 goto errout;
218
219 err = -ENOENT;
220 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
221 goto errout;
222
223
224 /* Create new proto tcf */
225
226 err = -ENOBUFS;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800227 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
228 if (tp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 goto errout;
Patrick McHardyf2df8242008-05-20 14:34:46 -0700230 err = -ENOENT;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800231 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 if (tp_ops == NULL) {
Johannes Berg95a5afc2008-10-16 15:24:51 -0700233#ifdef CONFIG_MODULES
Patrick McHardyadd93b62008-01-22 22:11:33 -0800234 struct nlattr *kind = tca[TCA_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 char name[IFNAMSIZ];
236
237 if (kind != NULL &&
Patrick McHardyadd93b62008-01-22 22:11:33 -0800238 nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 rtnl_unlock();
240 request_module("cls_%s", name);
241 rtnl_lock();
242 tp_ops = tcf_proto_lookup_ops(kind);
243 /* We dropped the RTNL semaphore in order to
244 * perform the module load. So, even if we
245 * succeeded in loading the module we have to
246 * replay the request. We indicate this using
247 * -EAGAIN.
248 */
249 if (tp_ops != NULL) {
250 module_put(tp_ops->owner);
251 err = -EAGAIN;
252 }
253 }
254#endif
255 kfree(tp);
256 goto errout;
257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 tp->ops = tp_ops;
259 tp->protocol = protocol;
Robert Loved0ab8ff2009-05-02 13:48:32 -0700260 tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 tp->q = q;
262 tp->classify = tp_ops->classify;
263 tp->classid = parent;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800264
265 err = tp_ops->init(tp);
266 if (err != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 module_put(tp_ops->owner);
268 kfree(tp);
269 goto errout;
270 }
271
Minoru Usui12186be2009-06-02 02:17:34 -0700272 tp_created = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Patrick McHardyadd93b62008-01-22 22:11:33 -0800274 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 goto errout;
276
277 fh = tp->ops->get(tp, t->tcm_handle);
278
279 if (fh == 0) {
280 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
David S. Miller55dbc6402008-07-16 02:40:45 -0700281 spin_lock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 *back = tp->next;
Jarek Poplawski323c0482008-08-14 17:01:10 -0700283 spin_unlock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
286 tcf_destroy(tp);
287 err = 0;
288 goto errout;
289 }
290
291 err = -ENOENT;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800292 if (n->nlmsg_type != RTM_NEWTFILTER ||
293 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 goto errout;
295 } else {
296 switch (n->nlmsg_type) {
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900297 case RTM_NEWTFILTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 err = -EEXIST;
Minoru Usui12186be2009-06-02 02:17:34 -0700299 if (n->nlmsg_flags & NLM_F_EXCL) {
300 if (tp_created)
301 tcf_destroy(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 goto errout;
Minoru Usui12186be2009-06-02 02:17:34 -0700303 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 break;
305 case RTM_DELTFILTER:
306 err = tp->ops->delete(tp, fh);
307 if (err == 0)
308 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
309 goto errout;
310 case RTM_GETTFILTER:
311 err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
312 goto errout;
313 default:
314 err = -EINVAL;
315 goto errout;
316 }
317 }
318
319 err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
Minoru Usui12186be2009-06-02 02:17:34 -0700320 if (err == 0) {
321 if (tp_created) {
322 spin_lock_bh(root_lock);
323 tp->next = *back;
324 *back = tp;
325 spin_unlock_bh(root_lock);
326 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
Minoru Usui12186be2009-06-02 02:17:34 -0700328 } else {
329 if (tp_created)
330 tcf_destroy(tp);
331 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333errout:
334 if (cl)
335 cops->put(q, cl);
336 if (err == -EAGAIN)
337 /* Replay the request. */
338 goto replay;
339 return err;
340}
341
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800342static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
343 unsigned long fh, u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct tcmsg *tcm;
346 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700347 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700349 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 tcm = NLMSG_DATA(nlh);
351 tcm->tcm_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700352 tcm->tcm__pad1 = 0;
Jiri Pirkoad61df92009-10-08 01:21:46 -0700353 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -0700354 tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 tcm->tcm_parent = tp->classid;
356 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
Patrick McHardy57e1c482008-01-23 20:34:28 -0800357 NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 tcm->tcm_handle = fh;
359 if (RTM_DELTFILTER != event) {
360 tcm->tcm_handle = 0;
361 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800362 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 }
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700364 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 return skb->len;
366
367nlmsg_failure:
Patrick McHardyadd93b62008-01-22 22:11:33 -0800368nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700369 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return -1;
371}
372
373static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
374 struct tcf_proto *tp, unsigned long fh, int event)
375{
376 struct sk_buff *skb;
377 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
378
379 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
380 if (!skb)
381 return -ENOBUFS;
382
383 if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
384 kfree_skb(skb);
385 return -EINVAL;
386 }
387
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800388 return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
389 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800392struct tcf_dump_args {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 struct tcf_walker w;
394 struct sk_buff *skb;
395 struct netlink_callback *cb;
396};
397
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800398static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
399 struct tcf_walker *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400{
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800401 struct tcf_dump_args *a = (void *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
404 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
405}
406
407static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
408{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900409 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 int t;
411 int s_t;
412 struct net_device *dev;
413 struct Qdisc *q;
414 struct tcf_proto *tp, **chain;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800415 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 unsigned long cl = 0;
Eric Dumazet20fea082007-11-14 01:44:41 -0800417 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct tcf_dump_args arg;
419
Denis V. Lunevb8542722007-12-01 00:21:31 +1100420 if (net != &init_net)
421 return 0;
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
424 return skb->len;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700425 if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return skb->len;
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (!tcm->tcm_parent)
Patrick McHardyaf356af2009-09-04 06:41:18 +0000429 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 else
431 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
432 if (!q)
433 goto out;
434 if ((cops = q->ops->cl_ops) == NULL)
435 goto errout;
Patrick McHardy71ebe5e2009-09-04 06:41:15 +0000436 if (cops->tcf_chain == NULL)
437 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 if (TC_H_MIN(tcm->tcm_parent)) {
439 cl = cops->get(q, tcm->tcm_parent);
440 if (cl == 0)
441 goto errout;
442 }
443 chain = cops->tcf_chain(q, cl);
444 if (chain == NULL)
445 goto errout;
446
447 s_t = cb->args[0];
448
449 for (tp=*chain, t=0; tp; tp = tp->next, t++) {
450 if (t < s_t) continue;
451 if (TC_H_MAJ(tcm->tcm_info) &&
452 TC_H_MAJ(tcm->tcm_info) != tp->prio)
453 continue;
454 if (TC_H_MIN(tcm->tcm_info) &&
455 TC_H_MIN(tcm->tcm_info) != tp->protocol)
456 continue;
457 if (t > s_t)
458 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
459 if (cb->args[1] == 0) {
460 if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800461 cb->nlh->nlmsg_seq, NLM_F_MULTI,
462 RTM_NEWTFILTER) <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 break;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 cb->args[1] = 1;
466 }
467 if (tp->ops->walk == NULL)
468 continue;
469 arg.w.fn = tcf_node_dump;
470 arg.skb = skb;
471 arg.cb = cb;
472 arg.w.stop = 0;
473 arg.w.skip = cb->args[1]-1;
474 arg.w.count = 0;
475 tp->ops->walk(tp, &arg.w);
476 cb->args[1] = arg.w.count+1;
477 if (arg.w.stop)
478 break;
479 }
480
481 cb->args[0] = t;
482
483errout:
484 if (cl)
485 cops->put(q, cl);
486out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 dev_put(dev);
488 return skb->len;
489}
490
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800491void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492{
493#ifdef CONFIG_NET_CLS_ACT
494 if (exts->action) {
495 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
496 exts->action = NULL;
497 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498#endif
499}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800500EXPORT_SYMBOL(tcf_exts_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Patrick McHardyadd93b62008-01-22 22:11:33 -0800502int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
503 struct nlattr *rate_tlv, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800504 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
506 memset(exts, 0, sizeof(*exts));
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508#ifdef CONFIG_NET_CLS_ACT
509 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 struct tc_action *act;
511
Patrick McHardyadd93b62008-01-22 22:11:33 -0800512 if (map->police && tb[map->police]) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800513 act = tcf_action_init_1(tb[map->police], rate_tlv,
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800514 "police", TCA_ACT_NOREPLACE,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800515 TCA_ACT_BIND);
516 if (IS_ERR(act))
517 return PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 act->type = TCA_OLD_COMPAT;
520 exts->action = act;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800521 } else if (map->action && tb[map->action]) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800522 act = tcf_action_init(tb[map->action], rate_tlv, NULL,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800523 TCA_ACT_NOREPLACE, TCA_ACT_BIND);
524 if (IS_ERR(act))
525 return PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 exts->action = act;
528 }
529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530#else
Patrick McHardyadd93b62008-01-22 22:11:33 -0800531 if ((map->action && tb[map->action]) ||
532 (map->police && tb[map->police]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return -EOPNOTSUPP;
534#endif
535
536 return 0;
537}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800538EXPORT_SYMBOL(tcf_exts_validate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800540void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
541 struct tcf_exts *src)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543#ifdef CONFIG_NET_CLS_ACT
544 if (src->action) {
545 struct tc_action *act;
546 tcf_tree_lock(tp);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000547 act = dst->action;
548 dst->action = src->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 tcf_tree_unlock(tp);
550 if (act)
551 tcf_action_destroy(act, TCA_ACT_UNBIND);
552 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553#endif
554}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800555EXPORT_SYMBOL(tcf_exts_change);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800557int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800558 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
560#ifdef CONFIG_NET_CLS_ACT
561 if (map->action && exts->action) {
562 /*
563 * again for backward compatible mode - we want
564 * to work with both old and new modes of entering
565 * tc data even if iproute2 was newer - jhs
566 */
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800567 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
569 if (exts->action->type != TCA_OLD_COMPAT) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800570 nest = nla_nest_start(skb, map->action);
571 if (nest == NULL)
572 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800574 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800575 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 } else if (map->police) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800577 nest = nla_nest_start(skb, map->police);
578 if (nest == NULL)
579 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800581 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800582 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 }
584 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585#endif
586 return 0;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800587nla_put_failure: __attribute__ ((unused))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 return -1;
589}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800590EXPORT_SYMBOL(tcf_exts_dump);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800592
593int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800594 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
596#ifdef CONFIG_NET_CLS_ACT
597 if (exts->action)
598 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800599 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600#endif
601 return 0;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800602nla_put_failure: __attribute__ ((unused))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 return -1;
604}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800605EXPORT_SYMBOL(tcf_exts_dump_stats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607static int __init tc_filter_init(void)
608{
Thomas Graf82623c02007-03-22 11:56:22 -0700609 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL);
610 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL);
611 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
612 tc_dump_tfilter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 return 0;
615}
616
617subsys_initcall(tc_filter_init);