blob: a69d44f1dac51786bed33220446629761df6de85 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110028#include <net/net_namespace.h>
29#include <net/sock.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070030#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <net/pkt_sched.h>
32#include <net/pkt_cls.h>
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/* The list of all installed classifier types */
35
Patrick McHardy2eb9d752008-01-22 22:10:42 -080036static struct tcf_proto_ops *tcf_proto_base __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38/* Protects list of registered TC modules. It is pure SMP lock. */
39static DEFINE_RWLOCK(cls_mod_lock);
40
41/* Find classifier type by string name */
42
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000043static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000045 const struct tcf_proto_ops *t = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 if (kind) {
48 read_lock(&cls_mod_lock);
49 for (t = tcf_proto_base; t; t = t->next) {
Patrick McHardyadd93b62008-01-22 22:11:33 -080050 if (nla_strcmp(kind, t->kind) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 if (!try_module_get(t->owner))
52 t = NULL;
53 break;
54 }
55 }
56 read_unlock(&cls_mod_lock);
57 }
58 return t;
59}
60
61/* Register(unregister) new classifier type */
62
63int register_tcf_proto_ops(struct tcf_proto_ops *ops)
64{
65 struct tcf_proto_ops *t, **tp;
66 int rc = -EEXIST;
67
68 write_lock(&cls_mod_lock);
69 for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
70 if (!strcmp(ops->kind, t->kind))
71 goto out;
72
73 ops->next = NULL;
74 *tp = ops;
75 rc = 0;
76out:
77 write_unlock(&cls_mod_lock);
78 return rc;
79}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -080080EXPORT_SYMBOL(register_tcf_proto_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
83{
84 struct tcf_proto_ops *t, **tp;
85 int rc = -ENOENT;
86
87 write_lock(&cls_mod_lock);
Eric Dumazetcc7ec452011-01-19 19:26:56 +000088 for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if (t == ops)
90 break;
91
92 if (!t)
93 goto out;
94 *tp = t->next;
95 rc = 0;
96out:
97 write_unlock(&cls_mod_lock);
98 return rc;
99}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800100EXPORT_SYMBOL(unregister_tcf_proto_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Tom Goff7316ae82010-03-19 15:40:13 +0000102static int tfilter_notify(struct net *net, struct sk_buff *oskb,
103 struct nlmsghdr *n, struct tcf_proto *tp,
104 unsigned long fh, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106
107/* Select new prio value from the range, managed by kernel. */
108
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800109static inline u32 tcf_auto_prio(struct tcf_proto *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800111 u32 first = TC_H_MAKE(0xC0000000U, 0U);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 if (tp)
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000114 first = tp->prio - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116 return first;
117}
118
119/* Add/change/delete/get a filter node */
120
121static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
122{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900123 struct net *net = sock_net(skb->sk);
Patrick McHardyadd93b62008-01-22 22:11:33 -0800124 struct nlattr *tca[TCA_MAX + 1];
David S. Miller55dbc642008-07-16 02:40:45 -0700125 spinlock_t *root_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 struct tcmsg *t;
127 u32 protocol;
128 u32 prio;
129 u32 nprio;
130 u32 parent;
131 struct net_device *dev;
132 struct Qdisc *q;
133 struct tcf_proto **back, **chain;
134 struct tcf_proto *tp;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000135 const struct tcf_proto_ops *tp_ops;
Eric Dumazet20fea082007-11-14 01:44:41 -0800136 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 unsigned long cl;
138 unsigned long fh;
139 int err;
Minoru Usui12186be2009-06-02 02:17:34 -0700140 int tp_created = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142replay:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 t = NLMSG_DATA(n);
144 protocol = TC_H_MIN(t->tcm_info);
145 prio = TC_H_MAJ(t->tcm_info);
146 nprio = prio;
147 parent = t->tcm_parent;
148 cl = 0;
149
150 if (prio == 0) {
151 /* If no priority is given, user wants we allocated it. */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000152 if (n->nlmsg_type != RTM_NEWTFILTER ||
153 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 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 */
Tom Goff7316ae82010-03-19 15:40:13 +0000161 dev = __dev_get_by_index(net, t->tcm_ifindex);
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800162 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? */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000180 cops = q->ops->cl_ops;
181 if (!cops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return -EINVAL;
183
Patrick McHardy71ebe5e2009-09-04 06:41:15 +0000184 if (cops->tcf_chain == NULL)
185 return -EOPNOTSUPP;
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 /* Do we search for filter, attached to class? */
188 if (TC_H_MIN(parent)) {
189 cl = cops->get(q, parent);
190 if (cl == 0)
191 return -ENOENT;
192 }
193
194 /* And the last stroke */
195 chain = cops->tcf_chain(q, cl);
196 err = -EINVAL;
197 if (chain == NULL)
198 goto errout;
199
200 /* Check the chain for existence of proto-tcf with this priority */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000201 for (back = chain; (tp = *back) != NULL; back = &tp->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (tp->prio >= prio) {
203 if (tp->prio == prio) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000204 if (!nprio ||
205 (tp->protocol != protocol && protocol))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 goto errout;
207 } else
208 tp = NULL;
209 break;
210 }
211 }
212
Jarek Poplawski102396a2008-08-29 14:21:52 -0700213 root_lock = qdisc_root_sleeping_lock(q);
David S. Miller55dbc642008-07-16 02:40:45 -0700214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (tp == NULL) {
216 /* Proto-tcf does not exist, create new one */
217
Patrick McHardyadd93b62008-01-22 22:11:33 -0800218 if (tca[TCA_KIND] == NULL || !protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 goto errout;
220
221 err = -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000222 if (n->nlmsg_type != RTM_NEWTFILTER ||
223 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 goto errout;
225
226
227 /* Create new proto tcf */
228
229 err = -ENOBUFS;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800230 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
231 if (tp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 goto errout;
Patrick McHardyf2df8242008-05-20 14:34:46 -0700233 err = -ENOENT;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800234 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (tp_ops == NULL) {
Johannes Berg95a5afc2008-10-16 15:24:51 -0700236#ifdef CONFIG_MODULES
Patrick McHardyadd93b62008-01-22 22:11:33 -0800237 struct nlattr *kind = tca[TCA_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 char name[IFNAMSIZ];
239
240 if (kind != NULL &&
Patrick McHardyadd93b62008-01-22 22:11:33 -0800241 nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 rtnl_unlock();
243 request_module("cls_%s", name);
244 rtnl_lock();
245 tp_ops = tcf_proto_lookup_ops(kind);
246 /* We dropped the RTNL semaphore in order to
247 * perform the module load. So, even if we
248 * succeeded in loading the module we have to
249 * replay the request. We indicate this using
250 * -EAGAIN.
251 */
252 if (tp_ops != NULL) {
253 module_put(tp_ops->owner);
254 err = -EAGAIN;
255 }
256 }
257#endif
258 kfree(tp);
259 goto errout;
260 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 tp->ops = tp_ops;
262 tp->protocol = protocol;
Robert Loved0ab8ff2009-05-02 13:48:32 -0700263 tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 tp->q = q;
265 tp->classify = tp_ops->classify;
266 tp->classid = parent;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800267
268 err = tp_ops->init(tp);
269 if (err != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 module_put(tp_ops->owner);
271 kfree(tp);
272 goto errout;
273 }
274
Minoru Usui12186be2009-06-02 02:17:34 -0700275 tp_created = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Patrick McHardyadd93b62008-01-22 22:11:33 -0800277 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 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) {
David S. Miller55dbc642008-07-16 02:40:45 -0700284 spin_lock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 *back = tp->next;
Jarek Poplawski323c0482008-08-14 17:01:10 -0700286 spin_unlock_bh(root_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Tom Goff7316ae82010-03-19 15:40:13 +0000288 tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 tcf_destroy(tp);
290 err = 0;
291 goto errout;
292 }
293
294 err = -ENOENT;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800295 if (n->nlmsg_type != RTM_NEWTFILTER ||
296 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 goto errout;
298 } else {
299 switch (n->nlmsg_type) {
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900300 case RTM_NEWTFILTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 err = -EEXIST;
Minoru Usui12186be2009-06-02 02:17:34 -0700302 if (n->nlmsg_flags & NLM_F_EXCL) {
303 if (tp_created)
304 tcf_destroy(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 goto errout;
Minoru Usui12186be2009-06-02 02:17:34 -0700306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 break;
308 case RTM_DELTFILTER:
309 err = tp->ops->delete(tp, fh);
310 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +0000311 tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 goto errout;
313 case RTM_GETTFILTER:
Tom Goff7316ae82010-03-19 15:40:13 +0000314 err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 goto errout;
316 default:
317 err = -EINVAL;
318 goto errout;
319 }
320 }
321
322 err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
Minoru Usui12186be2009-06-02 02:17:34 -0700323 if (err == 0) {
324 if (tp_created) {
325 spin_lock_bh(root_lock);
326 tp->next = *back;
327 *back = tp;
328 spin_unlock_bh(root_lock);
329 }
Tom Goff7316ae82010-03-19 15:40:13 +0000330 tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
Minoru Usui12186be2009-06-02 02:17:34 -0700331 } else {
332 if (tp_created)
333 tcf_destroy(tp);
334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336errout:
337 if (cl)
338 cops->put(q, cl);
339 if (err == -EAGAIN)
340 /* Replay the request. */
341 goto replay;
342 return err;
343}
344
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800345static int tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp,
346 unsigned long fh, u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 struct tcmsg *tcm;
349 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700350 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700352 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 tcm = NLMSG_DATA(nlh);
354 tcm->tcm_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700355 tcm->tcm__pad1 = 0;
Jiri Pirkoad61df92009-10-08 01:21:46 -0700356 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -0700357 tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 tcm->tcm_parent = tp->classid;
359 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
Patrick McHardy57e1c482008-01-23 20:34:28 -0800360 NLA_PUT_STRING(skb, TCA_KIND, tp->ops->kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 tcm->tcm_handle = fh;
362 if (RTM_DELTFILTER != event) {
363 tcm->tcm_handle = 0;
364 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800365 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700367 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return skb->len;
369
370nlmsg_failure:
Patrick McHardyadd93b62008-01-22 22:11:33 -0800371nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700372 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return -1;
374}
375
Tom Goff7316ae82010-03-19 15:40:13 +0000376static int tfilter_notify(struct net *net, struct sk_buff *oskb,
377 struct nlmsghdr *n, struct tcf_proto *tp,
378 unsigned long fh, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
380 struct sk_buff *skb;
381 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
382
383 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
384 if (!skb)
385 return -ENOBUFS;
386
387 if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
388 kfree_skb(skb);
389 return -EINVAL;
390 }
391
Tom Goff7316ae82010-03-19 15:40:13 +0000392 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800393 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800396struct tcf_dump_args {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 struct tcf_walker w;
398 struct sk_buff *skb;
399 struct netlink_callback *cb;
400};
401
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800402static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
403 struct tcf_walker *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800405 struct tcf_dump_args *a = (void *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
408 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
409}
410
Eric Dumazetbd27a872009-11-05 20:57:26 -0800411/* called with RTNL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
413{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900414 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 int t;
416 int s_t;
417 struct net_device *dev;
418 struct Qdisc *q;
419 struct tcf_proto *tp, **chain;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800420 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 unsigned long cl = 0;
Eric Dumazet20fea082007-11-14 01:44:41 -0800422 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 struct tcf_dump_args arg;
424
425 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
426 return skb->len;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000427 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
428 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return skb->len;
430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (!tcm->tcm_parent)
Patrick McHardyaf356af2009-09-04 06:41:18 +0000432 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 else
434 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
435 if (!q)
436 goto out;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000437 cops = q->ops->cl_ops;
438 if (!cops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 goto errout;
Patrick McHardy71ebe5e2009-09-04 06:41:15 +0000440 if (cops->tcf_chain == NULL)
441 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (TC_H_MIN(tcm->tcm_parent)) {
443 cl = cops->get(q, tcm->tcm_parent);
444 if (cl == 0)
445 goto errout;
446 }
447 chain = cops->tcf_chain(q, cl);
448 if (chain == NULL)
449 goto errout;
450
451 s_t = cb->args[0];
452
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000453 for (tp = *chain, t = 0; tp; tp = tp->next, t++) {
454 if (t < s_t)
455 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (TC_H_MAJ(tcm->tcm_info) &&
457 TC_H_MAJ(tcm->tcm_info) != tp->prio)
458 continue;
459 if (TC_H_MIN(tcm->tcm_info) &&
460 TC_H_MIN(tcm->tcm_info) != tp->protocol)
461 continue;
462 if (t > s_t)
463 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
464 if (cb->args[1] == 0) {
465 if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800466 cb->nlh->nlmsg_seq, NLM_F_MULTI,
467 RTM_NEWTFILTER) <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 break;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 cb->args[1] = 1;
471 }
472 if (tp->ops->walk == NULL)
473 continue;
474 arg.w.fn = tcf_node_dump;
475 arg.skb = skb;
476 arg.cb = cb;
477 arg.w.stop = 0;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000478 arg.w.skip = cb->args[1] - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 arg.w.count = 0;
480 tp->ops->walk(tp, &arg.w);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000481 cb->args[1] = arg.w.count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (arg.w.stop)
483 break;
484 }
485
486 cb->args[0] = t;
487
488errout:
489 if (cl)
490 cops->put(q, cl);
491out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 return skb->len;
493}
494
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800495void tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497#ifdef CONFIG_NET_CLS_ACT
498 if (exts->action) {
499 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
500 exts->action = NULL;
501 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502#endif
503}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800504EXPORT_SYMBOL(tcf_exts_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Patrick McHardyadd93b62008-01-22 22:11:33 -0800506int tcf_exts_validate(struct tcf_proto *tp, struct nlattr **tb,
507 struct nlattr *rate_tlv, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800508 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
510 memset(exts, 0, sizeof(*exts));
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512#ifdef CONFIG_NET_CLS_ACT
513 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 struct tc_action *act;
515
Patrick McHardyadd93b62008-01-22 22:11:33 -0800516 if (map->police && tb[map->police]) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800517 act = tcf_action_init_1(tb[map->police], rate_tlv,
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800518 "police", TCA_ACT_NOREPLACE,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800519 TCA_ACT_BIND);
520 if (IS_ERR(act))
521 return PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 act->type = TCA_OLD_COMPAT;
524 exts->action = act;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800525 } else if (map->action && tb[map->action]) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800526 act = tcf_action_init(tb[map->action], rate_tlv, NULL,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800527 TCA_ACT_NOREPLACE, TCA_ACT_BIND);
528 if (IS_ERR(act))
529 return PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 exts->action = act;
532 }
533 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534#else
Patrick McHardyadd93b62008-01-22 22:11:33 -0800535 if ((map->action && tb[map->action]) ||
536 (map->police && tb[map->police]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 return -EOPNOTSUPP;
538#endif
539
540 return 0;
541}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800542EXPORT_SYMBOL(tcf_exts_validate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800544void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
545 struct tcf_exts *src)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547#ifdef CONFIG_NET_CLS_ACT
548 if (src->action) {
549 struct tc_action *act;
550 tcf_tree_lock(tp);
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000551 act = dst->action;
552 dst->action = src->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 tcf_tree_unlock(tp);
554 if (act)
555 tcf_action_destroy(act, TCA_ACT_UNBIND);
556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557#endif
558}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800559EXPORT_SYMBOL(tcf_exts_change);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800561int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800562 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
564#ifdef CONFIG_NET_CLS_ACT
565 if (map->action && exts->action) {
566 /*
567 * again for backward compatible mode - we want
568 * to work with both old and new modes of entering
569 * tc data even if iproute2 was newer - jhs
570 */
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800571 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573 if (exts->action->type != TCA_OLD_COMPAT) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800574 nest = nla_nest_start(skb, map->action);
575 if (nest == NULL)
576 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800578 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800579 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 } else if (map->police) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800581 nest = nla_nest_start(skb, map->police);
582 if (nest == NULL)
583 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800585 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800586 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589#endif
590 return 0;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800591nla_put_failure: __attribute__ ((unused))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return -1;
593}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800594EXPORT_SYMBOL(tcf_exts_dump);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800596
597int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
Patrick McHardy52390082008-01-31 18:36:18 -0800598 const struct tcf_ext_map *map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
600#ifdef CONFIG_NET_CLS_ACT
601 if (exts->action)
602 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800603 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604#endif
605 return 0;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800606nla_put_failure: __attribute__ ((unused))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 return -1;
608}
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800609EXPORT_SYMBOL(tcf_exts_dump_stats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611static int __init tc_filter_init(void)
612{
Greg Rosec7ac8672011-06-10 01:27:09 +0000613 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
614 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
Thomas Graf82623c02007-03-22 11:56:22 -0700615 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
Greg Rosec7ac8672011-06-10 01:27:09 +0000616 tc_dump_tfilter, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return 0;
619}
620
621subsys_initcall(tc_filter_init);