blob: e3d2c78cb52c9aebf735fa01c1712203216a920e [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>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040023#include <linux/module.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110024#include <net/net_namespace.h>
25#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/sch_generic.h>
27#include <net/act_api.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070028#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
David S. Millere9ce1cd2006-08-21 23:54:55 -070030void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
31{
32 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
33 struct tcf_common **p1p;
34
35 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
36 if (*p1p == p) {
37 write_lock_bh(hinfo->lock);
38 *p1p = p->tcfc_next;
39 write_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070040 gen_kill_estimator(&p->tcfc_bstats,
41 &p->tcfc_rate_est);
Eric Dumazetc7de2cf2010-06-09 02:09:23 +000042 /*
43 * gen_estimator est_timer() might access p->tcfc_lock
44 * or bstats, wait a RCU grace period before freeing p
45 */
Lai Jiangshanf5c8593c2011-03-15 17:57:04 +080046 kfree_rcu(p, tcfc_rcu);
David S. Millere9ce1cd2006-08-21 23:54:55 -070047 return;
48 }
49 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -070050 WARN_ON(1);
David S. Millere9ce1cd2006-08-21 23:54:55 -070051}
52EXPORT_SYMBOL(tcf_hash_destroy);
53
54int tcf_hash_release(struct tcf_common *p, int bind,
55 struct tcf_hashinfo *hinfo)
56{
57 int ret = 0;
58
59 if (p) {
60 if (bind)
61 p->tcfc_bindcnt--;
62
63 p->tcfc_refcnt--;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090064 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070065 tcf_hash_destroy(p, hinfo);
66 ret = 1;
67 }
68 }
69 return ret;
70}
71EXPORT_SYMBOL(tcf_hash_release);
72
73static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
74 struct tc_action *a, struct tcf_hashinfo *hinfo)
75{
76 struct tcf_common *p;
Eric Dumazetcc7ec452011-01-19 19:26:56 +000077 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080078 struct nlattr *nest;
David S. Millere9ce1cd2006-08-21 23:54:55 -070079
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +020080 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070081
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 for (; p; p = p->tcfc_next) {
88 index++;
89 if (index < s_i)
90 continue;
91 a->priv = p;
92 a->order = n_i;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080093
94 nest = nla_nest_start(skb, a->order);
95 if (nest == NULL)
96 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -070097 err = tcf_action_dump_1(skb, a, 0, 0);
98 if (err < 0) {
99 index--;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800100 nlmsg_trim(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700101 goto done;
102 }
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800103 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700104 n_i++;
105 if (n_i >= TCA_ACT_MAX_PRIO)
106 goto done;
107 }
108 }
109done:
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200110 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700111 if (n_i)
112 cb->args[0] += n_i;
113 return n_i;
114
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800115nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800116 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700117 goto done;
118}
119
120static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
121 struct tcf_hashinfo *hinfo)
122{
123 struct tcf_common *p, *s_p;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800124 struct nlattr *nest;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000125 int i = 0, n_i = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700126
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800127 nest = nla_nest_start(skb, a->order);
128 if (nest == NULL)
129 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400130 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
131 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700132 for (i = 0; i < (hinfo->hmask + 1); i++) {
133 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
134
135 while (p != NULL) {
136 s_p = p->tcfc_next;
137 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000138 module_put(a->ops->owner);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700139 n_i++;
140 p = s_p;
141 }
142 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400143 if (nla_put_u32(skb, TCA_FCNT, n_i))
144 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800145 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700146
147 return n_i;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800148nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800149 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700150 return -EINVAL;
151}
152
153int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
154 int type, struct tc_action *a)
155{
156 struct tcf_hashinfo *hinfo = a->ops->hinfo;
157
158 if (type == RTM_DELACTION) {
159 return tcf_del_walker(skb, a, hinfo);
160 } else if (type == RTM_GETACTION) {
161 return tcf_dump_walker(skb, cb, a, hinfo);
162 } else {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000163 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700164 return -EINVAL;
165 }
166}
167EXPORT_SYMBOL(tcf_generic_walker);
168
169struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
170{
171 struct tcf_common *p;
172
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200173 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700174 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
175 p = p->tcfc_next) {
176 if (p->tcfc_index == index)
177 break;
178 }
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200179 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700180
181 return p;
182}
183EXPORT_SYMBOL(tcf_hash_lookup);
184
185u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
186{
187 u32 val = *idx_gen;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 return (*idx_gen = val);
195}
196EXPORT_SYMBOL(tcf_hash_new_index);
197
198int tcf_hash_search(struct tc_action *a, u32 index)
199{
200 struct tcf_hashinfo *hinfo = a->ops->hinfo;
201 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
202
203 if (p) {
204 a->priv = p;
205 return 1;
206 }
207 return 0;
208}
209EXPORT_SYMBOL(tcf_hash_search);
210
211struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
212 struct tcf_hashinfo *hinfo)
213{
214 struct tcf_common *p = NULL;
215 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700216 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700217 p->tcfc_bindcnt++;
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700218 p->tcfc_refcnt++;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700219 a->priv = p;
220 }
221 return p;
222}
223EXPORT_SYMBOL(tcf_hash_check);
224
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800225struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
226 struct tc_action *a, int size, int bind,
227 u32 *idx_gen, struct tcf_hashinfo *hinfo)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700228{
229 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
230
231 if (unlikely(!p))
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800232 return ERR_PTR(-ENOMEM);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700233 p->tcfc_refcnt = 1;
234 if (bind)
235 p->tcfc_bindcnt = 1;
236
237 spin_lock_init(&p->tcfc_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700238 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
239 p->tcfc_tm.install = jiffies;
240 p->tcfc_tm.lastuse = jiffies;
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800241 if (est) {
242 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
243 &p->tcfc_lock, est);
244 if (err) {
245 kfree(p);
246 return ERR_PTR(err);
247 }
248 }
249
David S. Millere9ce1cd2006-08-21 23:54:55 -0700250 a->priv = (void *) p;
251 return p;
252}
253EXPORT_SYMBOL(tcf_hash_create);
254
255void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
256{
257 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
258
259 write_lock_bh(hinfo->lock);
260 p->tcfc_next = hinfo->htab[h];
261 hinfo->htab[h] = p;
262 write_unlock_bh(hinfo->lock);
263}
264EXPORT_SYMBOL(tcf_hash_insert);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266static struct tc_action_ops *act_base = NULL;
267static DEFINE_RWLOCK(act_mod_lock);
268
269int tcf_register_action(struct tc_action_ops *act)
270{
271 struct tc_action_ops *a, **ap;
272
273 write_lock(&act_mod_lock);
274 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
275 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
276 write_unlock(&act_mod_lock);
277 return -EEXIST;
278 }
279 }
280 act->next = NULL;
281 *ap = act;
282 write_unlock(&act_mod_lock);
283 return 0;
284}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800285EXPORT_SYMBOL(tcf_register_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287int tcf_unregister_action(struct tc_action_ops *act)
288{
289 struct tc_action_ops *a, **ap;
290 int err = -ENOENT;
291
292 write_lock(&act_mod_lock);
293 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
294 if (a == act)
295 break;
296 if (a) {
297 *ap = a->next;
298 a->next = NULL;
299 err = 0;
300 }
301 write_unlock(&act_mod_lock);
302 return err;
303}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800304EXPORT_SYMBOL(tcf_unregister_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306/* lookup by name */
307static struct tc_action_ops *tc_lookup_action_n(char *kind)
308{
309 struct tc_action_ops *a = NULL;
310
311 if (kind) {
312 read_lock(&act_mod_lock);
313 for (a = act_base; a; a = a->next) {
314 if (strcmp(kind, a->kind) == 0) {
315 if (!try_module_get(a->owner)) {
316 read_unlock(&act_mod_lock);
317 return NULL;
318 }
319 break;
320 }
321 }
322 read_unlock(&act_mod_lock);
323 }
324 return a;
325}
326
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800327/* lookup by nlattr */
328static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
330 struct tc_action_ops *a = NULL;
331
332 if (kind) {
333 read_lock(&act_mod_lock);
334 for (a = act_base; a; a = a->next) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800335 if (nla_strcmp(kind, a->kind) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (!try_module_get(a->owner)) {
337 read_unlock(&act_mod_lock);
338 return NULL;
339 }
340 break;
341 }
342 }
343 read_unlock(&act_mod_lock);
344 }
345 return a;
346}
347
348#if 0
349/* lookup by id */
350static struct tc_action_ops *tc_lookup_action_id(u32 type)
351{
352 struct tc_action_ops *a = NULL;
353
354 if (type) {
355 read_lock(&act_mod_lock);
356 for (a = act_base; a; a = a->next) {
357 if (a->type == type) {
358 if (!try_module_get(a->owner)) {
359 read_unlock(&act_mod_lock);
360 return NULL;
361 }
362 break;
363 }
364 }
365 read_unlock(&act_mod_lock);
366 }
367 return a;
368}
369#endif
370
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000371int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900372 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000374 const struct tc_action *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 int ret = -1;
376
377 if (skb->tc_verd & TC_NCLS) {
378 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 ret = TC_ACT_OK;
380 goto exec_done;
381 }
382 while ((a = act) != NULL) {
383repeat:
384 if (a->ops && a->ops->act) {
Patrick McHardyf43c5a02006-01-08 22:15:34 -0800385 ret = a->ops->act(skb, a, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (TC_MUNGED & skb->tc_verd) {
387 /* copied already, allow trampling */
388 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
389 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 if (ret == TC_ACT_REPEAT)
392 goto repeat; /* we need a ttl - JHS */
J Hadi Salim14d50e72005-05-03 16:29:13 -0700393 if (ret != TC_ACT_PIPE)
394 goto exec_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
396 act = a->next;
397 }
398exec_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 return ret;
400}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800401EXPORT_SYMBOL(tcf_action_exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403void tcf_action_destroy(struct tc_action *act, int bind)
404{
405 struct tc_action *a;
406
407 for (a = act; a; a = act) {
408 if (a->ops && a->ops->cleanup) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
410 module_put(a->ops->owner);
411 act = act->next;
412 kfree(a);
stephen hemminger6ff9c362010-05-12 06:37:05 +0000413 } else {
414 /*FIXME: Remove later - catch insertion bugs*/
415 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 act = act->next;
417 kfree(a);
418 }
419 }
420}
421
422int
423tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
424{
425 int err = -EINVAL;
426
427 if (a->ops == NULL || a->ops->dump == NULL)
428 return err;
429 return a->ops->dump(skb, a, bind, ref);
430}
431
432int
433tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
434{
435 int err = -EINVAL;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700436 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800437 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 if (a->ops == NULL || a->ops->dump == NULL)
440 return err;
441
David S. Miller1b34ec42012-03-29 05:11:39 -0400442 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
443 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (tcf_action_copy_stats(skb, a, 0))
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800445 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800446 nest = nla_nest_start(skb, TCA_OPTIONS);
447 if (nest == NULL)
448 goto nla_put_failure;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000449 err = tcf_action_dump_old(skb, a, bind, ref);
450 if (err > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800451 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 return err;
453 }
454
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800455nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700456 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 return -1;
458}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800459EXPORT_SYMBOL(tcf_action_dump_1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461int
462tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
463{
464 struct tc_action *a;
465 int err = -EINVAL;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800466 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 while ((a = act) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 act = a->next;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800470 nest = nla_nest_start(skb, a->order);
471 if (nest == NULL)
472 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 err = tcf_action_dump_1(skb, a, bind, ref);
474 if (err < 0)
Thomas Graf4fe683f2006-07-05 20:47:28 -0700475 goto errout;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800476 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
478
479 return 0;
480
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800481nla_put_failure:
Thomas Graf4fe683f2006-07-05 20:47:28 -0700482 err = -EINVAL;
483errout:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800484 nla_nest_cancel(skb, nest);
Thomas Graf4fe683f2006-07-05 20:47:28 -0700485 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800488struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800489 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 struct tc_action *a;
492 struct tc_action_ops *a_o;
493 char act_name[IFNAMSIZ];
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000494 struct nlattr *tb[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800495 struct nlattr *kind;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800496 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (name == NULL) {
Patrick McHardycee63722008-01-23 20:33:32 -0800499 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
500 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 goto err_out;
Patrick McHardycee63722008-01-23 20:33:32 -0800502 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800503 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 if (kind == NULL)
505 goto err_out;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800506 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 goto err_out;
508 } else {
Patrick McHardycee63722008-01-23 20:33:32 -0800509 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
511 goto err_out;
512 }
513
514 a_o = tc_lookup_action_n(act_name);
515 if (a_o == NULL) {
Johannes Berg95a5afc2008-10-16 15:24:51 -0700516#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 rtnl_unlock();
Patrick McHardy4bba3922006-01-08 22:22:14 -0800518 request_module("act_%s", act_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 rtnl_lock();
520
521 a_o = tc_lookup_action_n(act_name);
522
523 /* We dropped the RTNL semaphore in order to
524 * perform the module load. So, even if we
525 * succeeded in loading the module we have to
526 * tell the caller to replay the request. We
527 * indicate this using -EAGAIN.
528 */
529 if (a_o != NULL) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800530 err = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 goto err_mod;
532 }
533#endif
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800534 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 goto err_out;
536 }
537
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800538 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700539 a = kzalloc(sizeof(*a), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (a == NULL)
541 goto err_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 /* backward compatibility for policer */
544 if (name == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800545 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 else
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800547 err = a_o->init(nla, est, a, ovr, bind);
548 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 goto err_free;
550
551 /* module count goes up only when brand new policy is created
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000552 * if it exists and is only bound to in a_o->init() then
553 * ACT_P_CREATED is not returned (a zero is).
554 */
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800555 if (err != ACT_P_CREATED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 module_put(a_o->owner);
557 a->ops = a_o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return a;
560
561err_free:
562 kfree(a);
563err_mod:
564 module_put(a_o->owner);
565err_out:
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800566 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800569struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800570 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000572 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct tc_action *head = NULL, *act, *act_prev = NULL;
Patrick McHardycee63722008-01-23 20:33:32 -0800574 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 int i;
576
Patrick McHardycee63722008-01-23 20:33:32 -0800577 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
578 if (err < 0)
579 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800581 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800582 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
583 if (IS_ERR(act))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 goto err;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800585 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 if (head == NULL)
588 head = act;
589 else
590 act_prev->next = act;
591 act_prev = act;
592 }
593 return head;
594
595err:
596 if (head != NULL)
597 tcf_action_destroy(head, bind);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800598 return act;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599}
600
601int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
602 int compat_mode)
603{
604 int err = 0;
605 struct gnet_dump d;
606 struct tcf_act_hdr *h = a->priv;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 if (h == NULL)
609 goto errout;
610
611 /* compat_mode being true specifies a call that is supposed
Dirk Hohndel06fe9fb2009-09-28 21:43:57 -0400612 * to add additional backward compatibility statistic TLVs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 */
614 if (compat_mode) {
615 if (a->type == TCA_OLD_COMPAT)
616 err = gnet_stats_start_copy_compat(skb, 0,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700617 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 else
619 return 0;
620 } else
621 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700622 &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
624 if (err < 0)
625 goto errout;
626
627 if (a->ops != NULL && a->ops->get_stats != NULL)
628 if (a->ops->get_stats(skb, a) < 0)
629 goto errout;
630
David S. Millere9ce1cd2006-08-21 23:54:55 -0700631 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000632 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
633 &h->tcf_rate_est) < 0 ||
David S. Millere9ce1cd2006-08-21 23:54:55 -0700634 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 goto errout;
636
637 if (gnet_stats_finish_copy(&d) < 0)
638 goto errout;
639
640 return 0;
641
642errout:
643 return -1;
644}
645
646static int
647tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900648 u16 flags, int event, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
650 struct tcamsg *t;
651 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700652 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800653 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
David S. Miller8b00a532012-06-26 21:39:32 -0700655 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*t), flags);
656 if (!nlh)
657 goto out_nlmsg_trim;
658 t = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 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)
David S. Miller8b00a532012-06-26 21:39:32 -0700665 goto out_nlmsg_trim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
667 if (tcf_action_dump(skb, a, bind, ref) < 0)
David S. Miller8b00a532012-06-26 21:39:32 -0700668 goto out_nlmsg_trim;
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
David S. Miller8b00a532012-06-26 21:39:32 -0700675out_nlmsg_trim:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700676 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 return -1;
678}
679
680static int
Tom Goff7316ae82010-03-19 15:40:13 +0000681act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
682 struct tc_action *a, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
684 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
687 if (!skb)
688 return -ENOBUFS;
689 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
690 kfree_skb(skb);
691 return -EINVAL;
692 }
Thomas Graf2942e902006-08-15 00:30:25 -0700693
Tom Goff7316ae82010-03-19 15:40:13 +0000694 return rtnl_unicast(skb, net, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695}
696
697static struct tc_action *
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800698tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000700 struct nlattr *tb[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 struct tc_action *a;
702 int index;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800703 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Patrick McHardycee63722008-01-23 20:33:32 -0800705 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
706 if (err < 0)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800707 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Patrick McHardycee63722008-01-23 20:33:32 -0800709 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800710 if (tb[TCA_ACT_INDEX] == NULL ||
711 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800712 goto err_out;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800713 index = nla_get_u32(tb[TCA_ACT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800715 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700716 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 if (a == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800718 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800720 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800721 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 if (a->ops == NULL)
723 goto err_free;
724 if (a->ops->lookup == NULL)
725 goto err_mod;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800726 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 if (a->ops->lookup(a, index) == 0)
728 goto err_mod;
729
730 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 return a;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733err_mod:
734 module_put(a->ops->owner);
735err_free:
736 kfree(a);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800737err_out:
738 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739}
740
741static void cleanup_a(struct tc_action *act)
742{
743 struct tc_action *a;
744
745 for (a = act; a; a = act) {
746 act = a->next;
747 kfree(a);
748 }
749}
750
751static struct tc_action *create_a(int i)
752{
753 struct tc_action *act;
754
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700755 act = kzalloc(sizeof(*act), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 if (act == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000757 pr_debug("create_a: failed to alloc!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 return NULL;
759 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 act->order = i;
761 return act;
762}
763
Tom Goff7316ae82010-03-19 15:40:13 +0000764static int tca_action_flush(struct net *net, struct nlattr *nla,
765 struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
767 struct sk_buff *skb;
768 unsigned char *b;
769 struct nlmsghdr *nlh;
770 struct tcamsg *t;
771 struct netlink_callback dcb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800772 struct nlattr *nest;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000773 struct nlattr *tb[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800774 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 struct tc_action *a = create_a(0);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700776 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778 if (a == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000779 pr_debug("tca_action_flush: couldnt create tc_action\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 return err;
781 }
782
783 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
784 if (!skb) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000785 pr_debug("tca_action_flush: failed skb alloc\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 kfree(a);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700787 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 }
789
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700790 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Patrick McHardycee63722008-01-23 20:33:32 -0800792 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
793 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 goto err_out;
795
Patrick McHardycee63722008-01-23 20:33:32 -0800796 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800797 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 a->ops = tc_lookup_action(kind);
799 if (a->ops == NULL)
800 goto err_out;
801
David S. Miller8b00a532012-06-26 21:39:32 -0700802 nlh = nlmsg_put(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
803 if (!nlh)
804 goto out_module_put;
805 t = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700807 t->tca__pad1 = 0;
808 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800810 nest = nla_nest_start(skb, TCA_ACT_TAB);
811 if (nest == NULL)
David S. Miller8b00a532012-06-26 21:39:32 -0700812 goto out_module_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
815 if (err < 0)
David S. Miller8b00a532012-06-26 21:39:32 -0700816 goto out_module_put;
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700817 if (err == 0)
818 goto noflush_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800820 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700822 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 nlh->nlmsg_flags |= NLM_F_ROOT;
824 module_put(a->ops->owner);
825 kfree(a);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000826 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
827 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (err > 0)
829 return 0;
830
831 return err;
832
David S. Miller8b00a532012-06-26 21:39:32 -0700833out_module_put:
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
David S. Miller8b00a532012-06-26 21:39:32 -0700923 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*t), flags);
924 if (!nlh)
925 goto out_kfree_skb;
926 t = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700928 t->tca__pad1 = 0;
929 t->tca__pad2 = 0;
930
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800931 nest = nla_nest_start(skb, TCA_ACT_TAB);
932 if (nest == NULL)
David S. Miller8b00a532012-06-26 21:39:32 -0700933 goto out_kfree_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 if (tcf_action_dump(skb, a, 0, 0) < 0)
David S. Miller8b00a532012-06-26 21:39:32 -0700936 goto out_kfree_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800938 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900939
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700940 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Patrick McHardyac6d4392005-08-14 19:29:52 -0700941 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900942
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000943 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 if (err > 0)
945 err = 0;
946 return err;
947
David S. Miller8b00a532012-06-26 21:39:32 -0700948out_kfree_skb:
Patrick McHardyf6e57462006-03-12 20:33:22 -0800949 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 return -1;
951}
952
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900953
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954static int
Tom Goff7316ae82010-03-19 15:40:13 +0000955tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
956 u32 pid, int ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957{
958 int ret = 0;
959 struct tc_action *act;
960 struct tc_action *a;
961 u32 seq = n->nlmsg_seq;
962
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800963 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 if (act == NULL)
965 goto done;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800966 if (IS_ERR(act)) {
967 ret = PTR_ERR(act);
968 goto done;
969 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 /* dump then free all the actions after update; inserted policy
972 * stays intact
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000973 */
Tom Goff7316ae82010-03-19 15:40:13 +0000974 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 for (a = act; a; a = act) {
976 act = a->next;
977 kfree(a);
978 }
979done:
980 return ret;
981}
982
983static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
984{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900985 struct net *net = sock_net(skb->sk);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800986 struct nlattr *tca[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
988 int ret = 0, ovr = 0;
989
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800990 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
991 if (ret < 0)
992 return ret;
993
994 if (tca[TCA_ACT_TAB] == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +0000995 pr_notice("tc_ctl_action: received NO action attribs\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 return -EINVAL;
997 }
998
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000999 /* n->nlmsg_flags & NLM_F_CREATE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 switch (n->nlmsg_type) {
1001 case RTM_NEWACTION:
1002 /* we are going to assume all other flags
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001003 * imply create only if it doesn't exist
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 * Note that CREATE | EXCL implies that
1005 * but since we want avoid ambiguity (eg when flags
1006 * is zero) then just set this
1007 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001008 if (n->nlmsg_flags & NLM_F_REPLACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 ovr = 1;
1010replay:
Tom Goff7316ae82010-03-19 15:40:13 +00001011 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 if (ret == -EAGAIN)
1013 goto replay;
1014 break;
1015 case RTM_DELACTION:
Tom Goff7316ae82010-03-19 15:40:13 +00001016 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1017 pid, RTM_DELACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 break;
1019 case RTM_GETACTION:
Tom Goff7316ae82010-03-19 15:40:13 +00001020 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1021 pid, RTM_GETACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 break;
1023 default:
1024 BUG();
1025 }
1026
1027 return ret;
1028}
1029
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001030static struct nlattr *
Patrick McHardy3a6c2b42009-08-25 16:07:40 +02001031find_dump_kind(const struct nlmsghdr *n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001033 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001034 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1035 struct nlattr *nla[TCAA_MAX + 1];
1036 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Patrick McHardyc96c9472008-01-23 20:32:58 -08001038 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001040 tb1 = nla[TCA_ACT_TAB];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 if (tb1 == NULL)
1042 return NULL;
1043
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001044 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1045 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Patrick McHardy6d834e02008-01-23 20:32:42 -08001048 if (tb[1] == NULL)
1049 return NULL;
1050 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1051 nla_len(tb[1]), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001053 kind = tb2[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Thomas Graf26dab892006-07-05 20:45:06 -07001055 return kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056}
1057
1058static int
1059tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1060{
1061 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001062 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001063 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct tc_action_ops *a_o;
1065 struct tc_action a;
1066 int ret = 0;
David S. Miller8b00a532012-06-26 21:39:32 -07001067 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001068 struct nlattr *kind = find_dump_kind(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070 if (kind == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +00001071 pr_info("tc_dump_action: action bad kind\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 return 0;
1073 }
1074
Thomas Graf26dab892006-07-05 20:45:06 -07001075 a_o = tc_lookup_action(kind);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001076 if (a_o == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 memset(&a, 0, sizeof(struct tc_action));
1080 a.ops = a_o;
1081
1082 if (a_o->walk == NULL) {
stephen hemminger6ff9c362010-05-12 06:37:05 +00001083 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1084 a_o->kind);
David S. Miller8b00a532012-06-26 21:39:32 -07001085 goto out_module_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 }
1087
David S. Miller8b00a532012-06-26 21:39:32 -07001088 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1089 cb->nlh->nlmsg_type, sizeof(*t), 0);
1090 if (!nlh)
1091 goto out_module_put;
1092 t = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001094 t->tca__pad1 = 0;
1095 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001097 nest = nla_nest_start(skb, TCA_ACT_TAB);
1098 if (nest == NULL)
David S. Miller8b00a532012-06-26 21:39:32 -07001099 goto out_module_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1102 if (ret < 0)
David S. Miller8b00a532012-06-26 21:39:32 -07001103 goto out_module_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104
1105 if (ret > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001106 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 ret = skb->len;
1108 } else
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001109 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001111 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 if (NETLINK_CB(cb->skb).pid && ret)
1113 nlh->nlmsg_flags |= NLM_F_MULTI;
1114 module_put(a_o->owner);
1115 return skb->len;
1116
David S. Miller8b00a532012-06-26 21:39:32 -07001117out_module_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 module_put(a_o->owner);
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001119 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 return skb->len;
1121}
1122
1123static int __init tc_action_init(void)
1124{
Greg Rosec7ac8672011-06-10 01:27:09 +00001125 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1126 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1127 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1128 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 return 0;
1131}
1132
1133subsys_initcall(tc_action_init);