blob: 14b42f4ad791eaf9191adb67e2b6d62d994c4e84 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/act_api.c Packet action 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 * Author: Jamal Hadi Salim
10 *
11 *
12 */
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/types.h>
15#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/init.h>
21#include <linux/kmod.h>
Patrick McHardyab27cfb2008-01-23 20:33:13 -080022#include <linux/err.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110023#include <net/net_namespace.h>
24#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <net/sch_generic.h>
26#include <net/act_api.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070027#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Eric Dumazetc7de2cf2010-06-09 02:09:23 +000029static void tcf_common_free_rcu(struct rcu_head *head)
30{
31 kfree(container_of(head, struct tcf_common, tcfc_rcu));
32}
33
David S. Millere9ce1cd2006-08-21 23:54:55 -070034void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
35{
36 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
37 struct tcf_common **p1p;
38
39 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
40 if (*p1p == p) {
41 write_lock_bh(hinfo->lock);
42 *p1p = p->tcfc_next;
43 write_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070044 gen_kill_estimator(&p->tcfc_bstats,
45 &p->tcfc_rate_est);
Eric Dumazetc7de2cf2010-06-09 02:09:23 +000046 /*
47 * gen_estimator est_timer() might access p->tcfc_lock
48 * or bstats, wait a RCU grace period before freeing p
49 */
50 call_rcu(&p->tcfc_rcu, tcf_common_free_rcu);
David S. Millere9ce1cd2006-08-21 23:54:55 -070051 return;
52 }
53 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -070054 WARN_ON(1);
David S. Millere9ce1cd2006-08-21 23:54:55 -070055}
56EXPORT_SYMBOL(tcf_hash_destroy);
57
58int tcf_hash_release(struct tcf_common *p, int bind,
59 struct tcf_hashinfo *hinfo)
60{
61 int ret = 0;
62
63 if (p) {
64 if (bind)
65 p->tcfc_bindcnt--;
66
67 p->tcfc_refcnt--;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090068 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070069 tcf_hash_destroy(p, hinfo);
70 ret = 1;
71 }
72 }
73 return ret;
74}
75EXPORT_SYMBOL(tcf_hash_release);
76
77static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
78 struct tc_action *a, struct tcf_hashinfo *hinfo)
79{
80 struct tcf_common *p;
Eric Dumazetcc7ec452011-01-19 19:26:56 +000081 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080082 struct nlattr *nest;
David S. Millere9ce1cd2006-08-21 23:54:55 -070083
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +020084 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070085
86 s_i = cb->args[0];
87
88 for (i = 0; i < (hinfo->hmask + 1); i++) {
89 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
90
91 for (; p; p = p->tcfc_next) {
92 index++;
93 if (index < s_i)
94 continue;
95 a->priv = p;
96 a->order = n_i;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080097
98 nest = nla_nest_start(skb, a->order);
99 if (nest == NULL)
100 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 err = tcf_action_dump_1(skb, a, 0, 0);
102 if (err < 0) {
103 index--;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800104 nlmsg_trim(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700105 goto done;
106 }
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800107 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700108 n_i++;
109 if (n_i >= TCA_ACT_MAX_PRIO)
110 goto done;
111 }
112 }
113done:
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200114 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700115 if (n_i)
116 cb->args[0] += n_i;
117 return n_i;
118
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800119nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800120 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700121 goto done;
122}
123
124static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
125 struct tcf_hashinfo *hinfo)
126{
127 struct tcf_common *p, *s_p;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800128 struct nlattr *nest;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000129 int i = 0, n_i = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700130
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800131 nest = nla_nest_start(skb, a->order);
132 if (nest == NULL)
133 goto nla_put_failure;
Patrick McHardy57e1c482008-01-23 20:34:28 -0800134 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
137
138 while (p != NULL) {
139 s_p = p->tcfc_next;
140 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000141 module_put(a->ops->owner);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142 n_i++;
143 p = s_p;
144 }
145 }
Patrick McHardy24beeab2008-01-23 20:34:48 -0800146 NLA_PUT_U32(skb, TCA_FCNT, n_i);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800147 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700148
149 return n_i;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800150nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800151 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700152 return -EINVAL;
153}
154
155int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
156 int type, struct tc_action *a)
157{
158 struct tcf_hashinfo *hinfo = a->ops->hinfo;
159
160 if (type == RTM_DELACTION) {
161 return tcf_del_walker(skb, a, hinfo);
162 } else if (type == RTM_GETACTION) {
163 return tcf_dump_walker(skb, cb, a, hinfo);
164 } else {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000165 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 return -EINVAL;
167 }
168}
169EXPORT_SYMBOL(tcf_generic_walker);
170
171struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
172{
173 struct tcf_common *p;
174
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200175 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700176 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
177 p = p->tcfc_next) {
178 if (p->tcfc_index == index)
179 break;
180 }
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200181 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700182
183 return p;
184}
185EXPORT_SYMBOL(tcf_hash_lookup);
186
187u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
188{
189 u32 val = *idx_gen;
190
191 do {
192 if (++val == 0)
193 val = 1;
194 } while (tcf_hash_lookup(val, hinfo));
195
196 return (*idx_gen = val);
197}
198EXPORT_SYMBOL(tcf_hash_new_index);
199
200int tcf_hash_search(struct tc_action *a, u32 index)
201{
202 struct tcf_hashinfo *hinfo = a->ops->hinfo;
203 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
204
205 if (p) {
206 a->priv = p;
207 return 1;
208 }
209 return 0;
210}
211EXPORT_SYMBOL(tcf_hash_search);
212
213struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
214 struct tcf_hashinfo *hinfo)
215{
216 struct tcf_common *p = NULL;
217 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700218 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700219 p->tcfc_bindcnt++;
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700220 p->tcfc_refcnt++;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700221 a->priv = p;
222 }
223 return p;
224}
225EXPORT_SYMBOL(tcf_hash_check);
226
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800227struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
228 struct tc_action *a, int size, int bind,
229 u32 *idx_gen, struct tcf_hashinfo *hinfo)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700230{
231 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
232
233 if (unlikely(!p))
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800234 return ERR_PTR(-ENOMEM);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700235 p->tcfc_refcnt = 1;
236 if (bind)
237 p->tcfc_bindcnt = 1;
238
239 spin_lock_init(&p->tcfc_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700240 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
241 p->tcfc_tm.install = jiffies;
242 p->tcfc_tm.lastuse = jiffies;
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800243 if (est) {
244 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
245 &p->tcfc_lock, est);
246 if (err) {
247 kfree(p);
248 return ERR_PTR(err);
249 }
250 }
251
David S. Millere9ce1cd2006-08-21 23:54:55 -0700252 a->priv = (void *) p;
253 return p;
254}
255EXPORT_SYMBOL(tcf_hash_create);
256
257void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
258{
259 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
260
261 write_lock_bh(hinfo->lock);
262 p->tcfc_next = hinfo->htab[h];
263 hinfo->htab[h] = p;
264 write_unlock_bh(hinfo->lock);
265}
266EXPORT_SYMBOL(tcf_hash_insert);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268static struct tc_action_ops *act_base = NULL;
269static DEFINE_RWLOCK(act_mod_lock);
270
271int tcf_register_action(struct tc_action_ops *act)
272{
273 struct tc_action_ops *a, **ap;
274
275 write_lock(&act_mod_lock);
276 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
277 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
278 write_unlock(&act_mod_lock);
279 return -EEXIST;
280 }
281 }
282 act->next = NULL;
283 *ap = act;
284 write_unlock(&act_mod_lock);
285 return 0;
286}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800287EXPORT_SYMBOL(tcf_register_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289int tcf_unregister_action(struct tc_action_ops *act)
290{
291 struct tc_action_ops *a, **ap;
292 int err = -ENOENT;
293
294 write_lock(&act_mod_lock);
295 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
296 if (a == act)
297 break;
298 if (a) {
299 *ap = a->next;
300 a->next = NULL;
301 err = 0;
302 }
303 write_unlock(&act_mod_lock);
304 return err;
305}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800306EXPORT_SYMBOL(tcf_unregister_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308/* lookup by name */
309static struct tc_action_ops *tc_lookup_action_n(char *kind)
310{
311 struct tc_action_ops *a = NULL;
312
313 if (kind) {
314 read_lock(&act_mod_lock);
315 for (a = act_base; a; a = a->next) {
316 if (strcmp(kind, a->kind) == 0) {
317 if (!try_module_get(a->owner)) {
318 read_unlock(&act_mod_lock);
319 return NULL;
320 }
321 break;
322 }
323 }
324 read_unlock(&act_mod_lock);
325 }
326 return a;
327}
328
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800329/* lookup by nlattr */
330static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 struct tc_action_ops *a = NULL;
333
334 if (kind) {
335 read_lock(&act_mod_lock);
336 for (a = act_base; a; a = a->next) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800337 if (nla_strcmp(kind, a->kind) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 if (!try_module_get(a->owner)) {
339 read_unlock(&act_mod_lock);
340 return NULL;
341 }
342 break;
343 }
344 }
345 read_unlock(&act_mod_lock);
346 }
347 return a;
348}
349
350#if 0
351/* lookup by id */
352static struct tc_action_ops *tc_lookup_action_id(u32 type)
353{
354 struct tc_action_ops *a = NULL;
355
356 if (type) {
357 read_lock(&act_mod_lock);
358 for (a = act_base; a; a = a->next) {
359 if (a->type == type) {
360 if (!try_module_get(a->owner)) {
361 read_unlock(&act_mod_lock);
362 return NULL;
363 }
364 break;
365 }
366 }
367 read_unlock(&act_mod_lock);
368 }
369 return a;
370}
371#endif
372
373int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900374 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
376 struct tc_action *a;
377 int ret = -1;
378
379 if (skb->tc_verd & TC_NCLS) {
380 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 ret = TC_ACT_OK;
382 goto exec_done;
383 }
384 while ((a = act) != NULL) {
385repeat:
386 if (a->ops && a->ops->act) {
Patrick McHardyf43c5a02006-01-08 22:15:34 -0800387 ret = a->ops->act(skb, a, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (TC_MUNGED & skb->tc_verd) {
389 /* copied already, allow trampling */
390 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
391 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 if (ret == TC_ACT_REPEAT)
394 goto repeat; /* we need a ttl - JHS */
J Hadi Salim14d50e72005-05-03 16:29:13 -0700395 if (ret != TC_ACT_PIPE)
396 goto exec_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
398 act = a->next;
399 }
400exec_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return ret;
402}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800403EXPORT_SYMBOL(tcf_action_exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405void tcf_action_destroy(struct tc_action *act, int bind)
406{
407 struct tc_action *a;
408
409 for (a = act; a; a = act) {
410 if (a->ops && a->ops->cleanup) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
412 module_put(a->ops->owner);
413 act = act->next;
414 kfree(a);
stephen hemminger6ff9c362010-05-12 06:37:05 +0000415 } else {
416 /*FIXME: Remove later - catch insertion bugs*/
417 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 act = act->next;
419 kfree(a);
420 }
421 }
422}
423
424int
425tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
426{
427 int err = -EINVAL;
428
429 if (a->ops == NULL || a->ops->dump == NULL)
430 return err;
431 return a->ops->dump(skb, a, bind, ref);
432}
433
434int
435tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
436{
437 int err = -EINVAL;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700438 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800439 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 if (a->ops == NULL || a->ops->dump == NULL)
442 return err;
443
Patrick McHardy57e1c482008-01-23 20:34:28 -0800444 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (tcf_action_copy_stats(skb, a, 0))
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800446 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800447 nest = nla_nest_start(skb, TCA_OPTIONS);
448 if (nest == NULL)
449 goto nla_put_failure;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000450 err = tcf_action_dump_old(skb, a, bind, ref);
451 if (err > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800452 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return err;
454 }
455
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800456nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700457 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 return -1;
459}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800460EXPORT_SYMBOL(tcf_action_dump_1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462int
463tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
464{
465 struct tc_action *a;
466 int err = -EINVAL;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800467 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 while ((a = act) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 act = a->next;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800471 nest = nla_nest_start(skb, a->order);
472 if (nest == NULL)
473 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 err = tcf_action_dump_1(skb, a, bind, ref);
475 if (err < 0)
Thomas Graf4fe683f2006-07-05 20:47:28 -0700476 goto errout;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800477 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
479
480 return 0;
481
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800482nla_put_failure:
Thomas Graf4fe683f2006-07-05 20:47:28 -0700483 err = -EINVAL;
484errout:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800485 nla_nest_cancel(skb, nest);
Thomas Graf4fe683f2006-07-05 20:47:28 -0700486 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800489struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800490 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
492 struct tc_action *a;
493 struct tc_action_ops *a_o;
494 char act_name[IFNAMSIZ];
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000495 struct nlattr *tb[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800496 struct nlattr *kind;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800497 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (name == NULL) {
Patrick McHardycee63722008-01-23 20:33:32 -0800500 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
501 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 goto err_out;
Patrick McHardycee63722008-01-23 20:33:32 -0800503 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800504 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (kind == NULL)
506 goto err_out;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800507 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 goto err_out;
509 } else {
Patrick McHardycee63722008-01-23 20:33:32 -0800510 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
512 goto err_out;
513 }
514
515 a_o = tc_lookup_action_n(act_name);
516 if (a_o == NULL) {
Johannes Berg95a5afc2008-10-16 15:24:51 -0700517#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 rtnl_unlock();
Patrick McHardy4bba3922006-01-08 22:22:14 -0800519 request_module("act_%s", act_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 rtnl_lock();
521
522 a_o = tc_lookup_action_n(act_name);
523
524 /* We dropped the RTNL semaphore in order to
525 * perform the module load. So, even if we
526 * succeeded in loading the module we have to
527 * tell the caller to replay the request. We
528 * indicate this using -EAGAIN.
529 */
530 if (a_o != NULL) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800531 err = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 goto err_mod;
533 }
534#endif
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800535 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 goto err_out;
537 }
538
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800539 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700540 a = kzalloc(sizeof(*a), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (a == NULL)
542 goto err_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 /* backward compatibility for policer */
545 if (name == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800546 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 else
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800548 err = a_o->init(nla, est, a, ovr, bind);
549 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 goto err_free;
551
552 /* module count goes up only when brand new policy is created
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000553 * if it exists and is only bound to in a_o->init() then
554 * ACT_P_CREATED is not returned (a zero is).
555 */
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800556 if (err != ACT_P_CREATED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 module_put(a_o->owner);
558 a->ops = a_o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return a;
561
562err_free:
563 kfree(a);
564err_mod:
565 module_put(a_o->owner);
566err_out:
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800567 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568}
569
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800570struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800571 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000573 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 struct tc_action *head = NULL, *act, *act_prev = NULL;
Patrick McHardycee63722008-01-23 20:33:32 -0800575 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 int i;
577
Patrick McHardycee63722008-01-23 20:33:32 -0800578 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
579 if (err < 0)
580 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800582 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800583 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
584 if (IS_ERR(act))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 goto err;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800586 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 if (head == NULL)
589 head = act;
590 else
591 act_prev->next = act;
592 act_prev = act;
593 }
594 return head;
595
596err:
597 if (head != NULL)
598 tcf_action_destroy(head, bind);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800599 return act;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
602int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
603 int compat_mode)
604{
605 int err = 0;
606 struct gnet_dump d;
607 struct tcf_act_hdr *h = a->priv;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (h == NULL)
610 goto errout;
611
612 /* compat_mode being true specifies a call that is supposed
Dirk Hohndel06fe9fb2009-09-28 21:43:57 -0400613 * to add additional backward compatibility statistic TLVs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 */
615 if (compat_mode) {
616 if (a->type == TCA_OLD_COMPAT)
617 err = gnet_stats_start_copy_compat(skb, 0,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700618 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 else
620 return 0;
621 } else
622 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700623 &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 if (err < 0)
626 goto errout;
627
628 if (a->ops != NULL && a->ops->get_stats != NULL)
629 if (a->ops->get_stats(skb, a) < 0)
630 goto errout;
631
David S. Millere9ce1cd2006-08-21 23:54:55 -0700632 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000633 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
634 &h->tcf_rate_est) < 0 ||
David S. Millere9ce1cd2006-08-21 23:54:55 -0700635 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 goto errout;
637
638 if (gnet_stats_finish_copy(&d) < 0)
639 goto errout;
640
641 return 0;
642
643errout:
644 return -1;
645}
646
647static int
648tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900649 u16 flags, int event, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650{
651 struct tcamsg *t;
652 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700653 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800654 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700656 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 t = NLMSG_DATA(nlh);
659 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700660 t->tca__pad1 = 0;
661 t->tca__pad2 = 0;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900662
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800663 nest = nla_nest_start(skb, TCA_ACT_TAB);
664 if (nest == NULL)
665 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
667 if (tcf_action_dump(skb, a, bind, ref) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800668 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800670 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900671
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700672 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 return skb->len;
674
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800675nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676nlmsg_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700677 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return -1;
679}
680
681static int
Tom Goff7316ae82010-03-19 15:40:13 +0000682act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
683 struct tc_action *a, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
685 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
688 if (!skb)
689 return -ENOBUFS;
690 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
691 kfree_skb(skb);
692 return -EINVAL;
693 }
Thomas Graf2942e902006-08-15 00:30:25 -0700694
Tom Goff7316ae82010-03-19 15:40:13 +0000695 return rtnl_unicast(skb, net, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696}
697
698static struct tc_action *
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800699tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000701 struct nlattr *tb[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 struct tc_action *a;
703 int index;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800704 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Patrick McHardycee63722008-01-23 20:33:32 -0800706 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
707 if (err < 0)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800708 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Patrick McHardycee63722008-01-23 20:33:32 -0800710 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800711 if (tb[TCA_ACT_INDEX] == NULL ||
712 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800713 goto err_out;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800714 index = nla_get_u32(tb[TCA_ACT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800716 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700717 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 if (a == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800719 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800721 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800722 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (a->ops == NULL)
724 goto err_free;
725 if (a->ops->lookup == NULL)
726 goto err_mod;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800727 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 if (a->ops->lookup(a, index) == 0)
729 goto err_mod;
730
731 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 return a;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734err_mod:
735 module_put(a->ops->owner);
736err_free:
737 kfree(a);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800738err_out:
739 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
742static void cleanup_a(struct tc_action *act)
743{
744 struct tc_action *a;
745
746 for (a = act; a; a = act) {
747 act = a->next;
748 kfree(a);
749 }
750}
751
752static struct tc_action *create_a(int i)
753{
754 struct tc_action *act;
755
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700756 act = kzalloc(sizeof(*act), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 if (act == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000758 pr_debug("create_a: failed to alloc!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 return NULL;
760 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 act->order = i;
762 return act;
763}
764
Tom Goff7316ae82010-03-19 15:40:13 +0000765static int tca_action_flush(struct net *net, struct nlattr *nla,
766 struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
768 struct sk_buff *skb;
769 unsigned char *b;
770 struct nlmsghdr *nlh;
771 struct tcamsg *t;
772 struct netlink_callback dcb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800773 struct nlattr *nest;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000774 struct nlattr *tb[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800775 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct tc_action *a = create_a(0);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700777 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
779 if (a == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000780 pr_debug("tca_action_flush: couldnt create tc_action\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 return err;
782 }
783
784 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
785 if (!skb) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000786 pr_debug("tca_action_flush: failed skb alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 kfree(a);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700788 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
790
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700791 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Patrick McHardycee63722008-01-23 20:33:32 -0800793 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
794 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 goto err_out;
796
Patrick McHardycee63722008-01-23 20:33:32 -0800797 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800798 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 a->ops = tc_lookup_action(kind);
800 if (a->ops == NULL)
801 goto err_out;
802
803 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
804 t = NLMSG_DATA(nlh);
805 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700806 t->tca__pad1 = 0;
807 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800809 nest = nla_nest_start(skb, TCA_ACT_TAB);
810 if (nest == NULL)
811 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
814 if (err < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800815 goto nla_put_failure;
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700816 if (err == 0)
817 goto noflush_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800819 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700821 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 nlh->nlmsg_flags |= NLM_F_ROOT;
823 module_put(a->ops->owner);
824 kfree(a);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000825 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
826 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (err > 0)
828 return 0;
829
830 return err;
831
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800832nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833nlmsg_failure:
Thomas Grafebbaeab2006-07-09 11:36:23 -0700834 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835err_out:
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700836noflush_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 kfree_skb(skb);
838 kfree(a);
839 return err;
840}
841
842static int
Tom Goff7316ae82010-03-19 15:40:13 +0000843tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
844 u32 pid, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845{
Patrick McHardycee63722008-01-23 20:33:32 -0800846 int i, ret;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000847 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 struct tc_action *head = NULL, *act, *act_prev = NULL;
849
Patrick McHardycee63722008-01-23 20:33:32 -0800850 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
851 if (ret < 0)
852 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000854 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700855 if (tb[1] != NULL)
Tom Goff7316ae82010-03-19 15:40:13 +0000856 return tca_action_flush(net, tb[1], n, pid);
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700857 else
858 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 }
860
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800861 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800862 act = tcf_action_get_1(tb[i], n, pid);
863 if (IS_ERR(act)) {
864 ret = PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 goto err;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800866 }
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800867 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 if (head == NULL)
870 head = act;
871 else
872 act_prev->next = act;
873 act_prev = act;
874 }
875
876 if (event == RTM_GETACTION)
Tom Goff7316ae82010-03-19 15:40:13 +0000877 ret = act_get_notify(net, pid, n, head, event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 else { /* delete */
879 struct sk_buff *skb;
880
881 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
882 if (!skb) {
883 ret = -ENOBUFS;
884 goto err;
885 }
886
887 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900888 0, 1) <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 kfree_skb(skb);
890 ret = -EINVAL;
891 goto err;
892 }
893
894 /* now do the delete */
895 tcf_action_destroy(head, 0);
Tom Goff7316ae82010-03-19 15:40:13 +0000896 ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000897 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (ret > 0)
899 return 0;
900 return ret;
901 }
902err:
903 cleanup_a(head);
904 return ret;
905}
906
Tom Goff7316ae82010-03-19 15:40:13 +0000907static int tcf_add_notify(struct net *net, struct tc_action *a,
908 u32 pid, u32 seq, int event, u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
910 struct tcamsg *t;
911 struct nlmsghdr *nlh;
912 struct sk_buff *skb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800913 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 unsigned char *b;
915 int err = 0;
916
917 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
918 if (!skb)
919 return -ENOBUFS;
920
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700921 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700923 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 t = NLMSG_DATA(nlh);
925 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700926 t->tca__pad1 = 0;
927 t->tca__pad2 = 0;
928
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800929 nest = nla_nest_start(skb, TCA_ACT_TAB);
930 if (nest == NULL)
931 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
933 if (tcf_action_dump(skb, a, 0, 0) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800934 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800936 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900937
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700938 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Patrick McHardyac6d4392005-08-14 19:29:52 -0700939 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900940
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000941 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 if (err > 0)
943 err = 0;
944 return err;
945
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800946nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947nlmsg_failure:
Patrick McHardyf6e57462006-03-12 20:33:22 -0800948 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 return -1;
950}
951
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900952
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953static int
Tom Goff7316ae82010-03-19 15:40:13 +0000954tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
955 u32 pid, int ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
957 int ret = 0;
958 struct tc_action *act;
959 struct tc_action *a;
960 u32 seq = n->nlmsg_seq;
961
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800962 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (act == NULL)
964 goto done;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800965 if (IS_ERR(act)) {
966 ret = PTR_ERR(act);
967 goto done;
968 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970 /* dump then free all the actions after update; inserted policy
971 * stays intact
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000972 */
Tom Goff7316ae82010-03-19 15:40:13 +0000973 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 for (a = act; a; a = act) {
975 act = a->next;
976 kfree(a);
977 }
978done:
979 return ret;
980}
981
982static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
983{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900984 struct net *net = sock_net(skb->sk);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800985 struct nlattr *tca[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
987 int ret = 0, ovr = 0;
988
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800989 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
990 if (ret < 0)
991 return ret;
992
993 if (tca[TCA_ACT_TAB] == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000994 pr_notice("tc_ctl_action: received NO action attribs\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 return -EINVAL;
996 }
997
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000998 /* n->nlmsg_flags & NLM_F_CREATE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 switch (n->nlmsg_type) {
1000 case RTM_NEWACTION:
1001 /* we are going to assume all other flags
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001002 * imply create only if it doesn't exist
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 * Note that CREATE | EXCL implies that
1004 * but since we want avoid ambiguity (eg when flags
1005 * is zero) then just set this
1006 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001007 if (n->nlmsg_flags & NLM_F_REPLACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 ovr = 1;
1009replay:
Tom Goff7316ae82010-03-19 15:40:13 +00001010 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 if (ret == -EAGAIN)
1012 goto replay;
1013 break;
1014 case RTM_DELACTION:
Tom Goff7316ae82010-03-19 15:40:13 +00001015 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1016 pid, RTM_DELACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 break;
1018 case RTM_GETACTION:
Tom Goff7316ae82010-03-19 15:40:13 +00001019 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1020 pid, RTM_GETACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 break;
1022 default:
1023 BUG();
1024 }
1025
1026 return ret;
1027}
1028
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001029static struct nlattr *
Patrick McHardy3a6c2b42009-08-25 16:07:40 +02001030find_dump_kind(const struct nlmsghdr *n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031{
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001032 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001033 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1034 struct nlattr *nla[TCAA_MAX + 1];
1035 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Patrick McHardyc96c9472008-01-23 20:32:58 -08001037 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001039 tb1 = nla[TCA_ACT_TAB];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 if (tb1 == NULL)
1041 return NULL;
1042
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001043 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1044 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Patrick McHardy6d834e02008-01-23 20:32:42 -08001047 if (tb[1] == NULL)
1048 return NULL;
1049 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1050 nla_len(tb[1]), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001052 kind = tb2[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
Thomas Graf26dab892006-07-05 20:45:06 -07001054 return kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
1057static int
1058tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1059{
1060 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001061 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001062 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 struct tc_action_ops *a_o;
1064 struct tc_action a;
1065 int ret = 0;
1066 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001067 struct nlattr *kind = find_dump_kind(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
1069 if (kind == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +00001070 pr_info("tc_dump_action: action bad kind\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 return 0;
1072 }
1073
Thomas Graf26dab892006-07-05 20:45:06 -07001074 a_o = tc_lookup_action(kind);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001075 if (a_o == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
1078 memset(&a, 0, sizeof(struct tc_action));
1079 a.ops = a_o;
1080
1081 if (a_o->walk == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +00001082 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1083 a_o->kind);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001084 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 }
1086
1087 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001088 cb->nlh->nlmsg_type, sizeof(*t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 t = NLMSG_DATA(nlh);
1090 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001091 t->tca__pad1 = 0;
1092 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001094 nest = nla_nest_start(skb, TCA_ACT_TAB);
1095 if (nest == NULL)
1096 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1099 if (ret < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001100 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
1102 if (ret > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001103 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 ret = skb->len;
1105 } else
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001106 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001108 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (NETLINK_CB(cb->skb).pid && ret)
1110 nlh->nlmsg_flags |= NLM_F_MULTI;
1111 module_put(a_o->owner);
1112 return skb->len;
1113
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001114nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115nlmsg_failure:
1116 module_put(a_o->owner);
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001117 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 return skb->len;
1119}
1120
1121static int __init tc_action_init(void)
1122{
Thomas Graf708914c2007-03-22 11:56:59 -07001123 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1124 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1125 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 return 0;
1128}
1129
1130subsys_initcall(tc_action_init);