blob: ca2e1fd2bf6981a501ab4f34f9af40ab8d0dcd30 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/init.h>
20#include <linux/kmod.h>
Patrick McHardyab27cfb2008-01-23 20:33:13 -080021#include <linux/err.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110022#include <net/net_namespace.h>
23#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <net/sch_generic.h>
25#include <net/act_api.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070026#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
David S. Millere9ce1cd2006-08-21 23:54:55 -070028void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
29{
30 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
31 struct tcf_common **p1p;
32
33 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
34 if (*p1p == p) {
35 write_lock_bh(hinfo->lock);
36 *p1p = p->tcfc_next;
37 write_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070038 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
David S. Millere9ce1cd2006-08-21 23:54:55 -070040 kfree(p);
41 return;
42 }
43 }
Ilpo Järvinen547b7922008-07-25 21:43:18 -070044 WARN_ON(1);
David S. Millere9ce1cd2006-08-21 23:54:55 -070045}
46EXPORT_SYMBOL(tcf_hash_destroy);
47
48int tcf_hash_release(struct tcf_common *p, int bind,
49 struct tcf_hashinfo *hinfo)
50{
51 int ret = 0;
52
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
56
57 p->tcfc_refcnt--;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090058 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
David S. Millere9ce1cd2006-08-21 23:54:55 -070059 tcf_hash_destroy(p, hinfo);
60 ret = 1;
61 }
62 }
63 return ret;
64}
65EXPORT_SYMBOL(tcf_hash_release);
66
67static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
68 struct tc_action *a, struct tcf_hashinfo *hinfo)
69{
70 struct tcf_common *p;
71 int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080072 struct nlattr *nest;
David S. Millere9ce1cd2006-08-21 23:54:55 -070073
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +020074 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -070075
76 s_i = cb->args[0];
77
78 for (i = 0; i < (hinfo->hmask + 1); i++) {
79 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
80
81 for (; p; p = p->tcfc_next) {
82 index++;
83 if (index < s_i)
84 continue;
85 a->priv = p;
86 a->order = n_i;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080087
88 nest = nla_nest_start(skb, a->order);
89 if (nest == NULL)
90 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -070091 err = tcf_action_dump_1(skb, a, 0, 0);
92 if (err < 0) {
93 index--;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080094 nlmsg_trim(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -070095 goto done;
96 }
Patrick McHardy4b3550ef2008-01-23 20:34:11 -080097 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -070098 n_i++;
99 if (n_i >= TCA_ACT_MAX_PRIO)
100 goto done;
101 }
102 }
103done:
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200104 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700105 if (n_i)
106 cb->args[0] += n_i;
107 return n_i;
108
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800109nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800110 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700111 goto done;
112}
113
114static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
115 struct tcf_hashinfo *hinfo)
116{
117 struct tcf_common *p, *s_p;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800118 struct nlattr *nest;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700119 int i= 0, n_i = 0;
120
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800121 nest = nla_nest_start(skb, a->order);
122 if (nest == NULL)
123 goto nla_put_failure;
Patrick McHardy57e1c482008-01-23 20:34:28 -0800124 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700125 for (i = 0; i < (hinfo->hmask + 1); i++) {
126 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
127
128 while (p != NULL) {
129 s_p = p->tcfc_next;
130 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
131 module_put(a->ops->owner);
132 n_i++;
133 p = s_p;
134 }
135 }
Patrick McHardy24beeab2008-01-23 20:34:48 -0800136 NLA_PUT_U32(skb, TCA_FCNT, n_i);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800137 nla_nest_end(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700138
139 return n_i;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800140nla_put_failure:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800141 nla_nest_cancel(skb, nest);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700142 return -EINVAL;
143}
144
145int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
146 int type, struct tc_action *a)
147{
148 struct tcf_hashinfo *hinfo = a->ops->hinfo;
149
150 if (type == RTM_DELACTION) {
151 return tcf_del_walker(skb, a, hinfo);
152 } else if (type == RTM_GETACTION) {
153 return tcf_dump_walker(skb, cb, a, hinfo);
154 } else {
155 printk("tcf_generic_walker: unknown action %d\n", type);
156 return -EINVAL;
157 }
158}
159EXPORT_SYMBOL(tcf_generic_walker);
160
161struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
162{
163 struct tcf_common *p;
164
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200165 read_lock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
167 p = p->tcfc_next) {
168 if (p->tcfc_index == index)
169 break;
170 }
Jamal Hadi Salime1e992e2007-09-12 16:32:59 +0200171 read_unlock_bh(hinfo->lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700172
173 return p;
174}
175EXPORT_SYMBOL(tcf_hash_lookup);
176
177u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
178{
179 u32 val = *idx_gen;
180
181 do {
182 if (++val == 0)
183 val = 1;
184 } while (tcf_hash_lookup(val, hinfo));
185
186 return (*idx_gen = val);
187}
188EXPORT_SYMBOL(tcf_hash_new_index);
189
190int tcf_hash_search(struct tc_action *a, u32 index)
191{
192 struct tcf_hashinfo *hinfo = a->ops->hinfo;
193 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
194
195 if (p) {
196 a->priv = p;
197 return 1;
198 }
199 return 0;
200}
201EXPORT_SYMBOL(tcf_hash_search);
202
203struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
204 struct tcf_hashinfo *hinfo)
205{
206 struct tcf_common *p = NULL;
207 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700208 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700209 p->tcfc_bindcnt++;
Jamal Hadi Salim76aab2c2008-08-07 20:37:22 -0700210 p->tcfc_refcnt++;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700211 a->priv = p;
212 }
213 return p;
214}
215EXPORT_SYMBOL(tcf_hash_check);
216
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800217struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
218 struct tc_action *a, int size, int bind,
219 u32 *idx_gen, struct tcf_hashinfo *hinfo)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700220{
221 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
222
223 if (unlikely(!p))
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800224 return ERR_PTR(-ENOMEM);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700225 p->tcfc_refcnt = 1;
226 if (bind)
227 p->tcfc_bindcnt = 1;
228
229 spin_lock_init(&p->tcfc_lock);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700230 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
231 p->tcfc_tm.install = jiffies;
232 p->tcfc_tm.lastuse = jiffies;
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800233 if (est) {
234 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
235 &p->tcfc_lock, est);
236 if (err) {
237 kfree(p);
238 return ERR_PTR(err);
239 }
240 }
241
David S. Millere9ce1cd2006-08-21 23:54:55 -0700242 a->priv = (void *) p;
243 return p;
244}
245EXPORT_SYMBOL(tcf_hash_create);
246
247void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
248{
249 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
250
251 write_lock_bh(hinfo->lock);
252 p->tcfc_next = hinfo->htab[h];
253 hinfo->htab[h] = p;
254 write_unlock_bh(hinfo->lock);
255}
256EXPORT_SYMBOL(tcf_hash_insert);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258static struct tc_action_ops *act_base = NULL;
259static DEFINE_RWLOCK(act_mod_lock);
260
261int tcf_register_action(struct tc_action_ops *act)
262{
263 struct tc_action_ops *a, **ap;
264
265 write_lock(&act_mod_lock);
266 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
267 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
268 write_unlock(&act_mod_lock);
269 return -EEXIST;
270 }
271 }
272 act->next = NULL;
273 *ap = act;
274 write_unlock(&act_mod_lock);
275 return 0;
276}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800277EXPORT_SYMBOL(tcf_register_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279int tcf_unregister_action(struct tc_action_ops *act)
280{
281 struct tc_action_ops *a, **ap;
282 int err = -ENOENT;
283
284 write_lock(&act_mod_lock);
285 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
286 if (a == act)
287 break;
288 if (a) {
289 *ap = a->next;
290 a->next = NULL;
291 err = 0;
292 }
293 write_unlock(&act_mod_lock);
294 return err;
295}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800296EXPORT_SYMBOL(tcf_unregister_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298/* lookup by name */
299static struct tc_action_ops *tc_lookup_action_n(char *kind)
300{
301 struct tc_action_ops *a = NULL;
302
303 if (kind) {
304 read_lock(&act_mod_lock);
305 for (a = act_base; a; a = a->next) {
306 if (strcmp(kind, a->kind) == 0) {
307 if (!try_module_get(a->owner)) {
308 read_unlock(&act_mod_lock);
309 return NULL;
310 }
311 break;
312 }
313 }
314 read_unlock(&act_mod_lock);
315 }
316 return a;
317}
318
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800319/* lookup by nlattr */
320static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
322 struct tc_action_ops *a = NULL;
323
324 if (kind) {
325 read_lock(&act_mod_lock);
326 for (a = act_base; a; a = a->next) {
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800327 if (nla_strcmp(kind, a->kind) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 if (!try_module_get(a->owner)) {
329 read_unlock(&act_mod_lock);
330 return NULL;
331 }
332 break;
333 }
334 }
335 read_unlock(&act_mod_lock);
336 }
337 return a;
338}
339
340#if 0
341/* lookup by id */
342static struct tc_action_ops *tc_lookup_action_id(u32 type)
343{
344 struct tc_action_ops *a = NULL;
345
346 if (type) {
347 read_lock(&act_mod_lock);
348 for (a = act_base; a; a = a->next) {
349 if (a->type == type) {
350 if (!try_module_get(a->owner)) {
351 read_unlock(&act_mod_lock);
352 return NULL;
353 }
354 break;
355 }
356 }
357 read_unlock(&act_mod_lock);
358 }
359 return a;
360}
361#endif
362
363int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900364 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 struct tc_action *a;
367 int ret = -1;
368
369 if (skb->tc_verd & TC_NCLS) {
370 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 ret = TC_ACT_OK;
372 goto exec_done;
373 }
374 while ((a = act) != NULL) {
375repeat:
376 if (a->ops && a->ops->act) {
Patrick McHardyf43c5a02006-01-08 22:15:34 -0800377 ret = a->ops->act(skb, a, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (TC_MUNGED & skb->tc_verd) {
379 /* copied already, allow trampling */
380 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
381 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
382 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 if (ret == TC_ACT_REPEAT)
384 goto repeat; /* we need a ttl - JHS */
J Hadi Salim14d50e72005-05-03 16:29:13 -0700385 if (ret != TC_ACT_PIPE)
386 goto exec_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388 act = a->next;
389 }
390exec_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return ret;
392}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800393EXPORT_SYMBOL(tcf_action_exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395void tcf_action_destroy(struct tc_action *act, int bind)
396{
397 struct tc_action *a;
398
399 for (a = act; a; a = act) {
400 if (a->ops && a->ops->cleanup) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
402 module_put(a->ops->owner);
403 act = act->next;
404 kfree(a);
405 } else { /*FIXME: Remove later - catch insertion bugs*/
406 printk("tcf_action_destroy: BUG? destroying NULL ops\n");
407 act = act->next;
408 kfree(a);
409 }
410 }
411}
412
413int
414tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
415{
416 int err = -EINVAL;
417
418 if (a->ops == NULL || a->ops->dump == NULL)
419 return err;
420 return a->ops->dump(skb, a, bind, ref);
421}
422
423int
424tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
425{
426 int err = -EINVAL;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700427 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800428 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 if (a->ops == NULL || a->ops->dump == NULL)
431 return err;
432
Patrick McHardy57e1c482008-01-23 20:34:28 -0800433 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (tcf_action_copy_stats(skb, a, 0))
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800435 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800436 nest = nla_nest_start(skb, TCA_OPTIONS);
437 if (nest == NULL)
438 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800440 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return err;
442 }
443
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800444nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700445 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return -1;
447}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800448EXPORT_SYMBOL(tcf_action_dump_1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450int
451tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
452{
453 struct tc_action *a;
454 int err = -EINVAL;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800455 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 while ((a = act) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 act = a->next;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800459 nest = nla_nest_start(skb, a->order);
460 if (nest == NULL)
461 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 err = tcf_action_dump_1(skb, a, bind, ref);
463 if (err < 0)
Thomas Graf4fe683f2006-07-05 20:47:28 -0700464 goto errout;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800465 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467
468 return 0;
469
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800470nla_put_failure:
Thomas Graf4fe683f2006-07-05 20:47:28 -0700471 err = -EINVAL;
472errout:
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800473 nla_nest_cancel(skb, nest);
Thomas Graf4fe683f2006-07-05 20:47:28 -0700474 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800477struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800478 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 struct tc_action *a;
481 struct tc_action_ops *a_o;
482 char act_name[IFNAMSIZ];
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800483 struct nlattr *tb[TCA_ACT_MAX+1];
484 struct nlattr *kind;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800485 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (name == NULL) {
Patrick McHardycee63722008-01-23 20:33:32 -0800488 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
489 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 goto err_out;
Patrick McHardycee63722008-01-23 20:33:32 -0800491 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800492 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (kind == NULL)
494 goto err_out;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800495 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 goto err_out;
497 } else {
Patrick McHardycee63722008-01-23 20:33:32 -0800498 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
500 goto err_out;
501 }
502
503 a_o = tc_lookup_action_n(act_name);
504 if (a_o == NULL) {
Johannes Berg95a5afc2008-10-16 15:24:51 -0700505#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 rtnl_unlock();
Patrick McHardy4bba3922006-01-08 22:22:14 -0800507 request_module("act_%s", act_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 rtnl_lock();
509
510 a_o = tc_lookup_action_n(act_name);
511
512 /* We dropped the RTNL semaphore in order to
513 * perform the module load. So, even if we
514 * succeeded in loading the module we have to
515 * tell the caller to replay the request. We
516 * indicate this using -EAGAIN.
517 */
518 if (a_o != NULL) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800519 err = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 goto err_mod;
521 }
522#endif
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800523 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 goto err_out;
525 }
526
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800527 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700528 a = kzalloc(sizeof(*a), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 if (a == NULL)
530 goto err_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 /* backward compatibility for policer */
533 if (name == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800534 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 else
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800536 err = a_o->init(nla, est, a, ovr, bind);
537 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 goto err_free;
539
540 /* module count goes up only when brand new policy is created
541 if it exists and is only bound to in a_o->init() then
542 ACT_P_CREATED is not returned (a zero is).
543 */
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800544 if (err != ACT_P_CREATED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 module_put(a_o->owner);
546 a->ops = a_o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return a;
549
550err_free:
551 kfree(a);
552err_mod:
553 module_put(a_o->owner);
554err_out:
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800555 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556}
557
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800558struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800559 char *name, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800561 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct tc_action *head = NULL, *act, *act_prev = NULL;
Patrick McHardycee63722008-01-23 20:33:32 -0800563 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 int i;
565
Patrick McHardycee63722008-01-23 20:33:32 -0800566 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
567 if (err < 0)
568 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800570 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800571 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
572 if (IS_ERR(act))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 goto err;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800574 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 if (head == NULL)
577 head = act;
578 else
579 act_prev->next = act;
580 act_prev = act;
581 }
582 return head;
583
584err:
585 if (head != NULL)
586 tcf_action_destroy(head, bind);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800587 return act;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
590int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
591 int compat_mode)
592{
593 int err = 0;
594 struct gnet_dump d;
595 struct tcf_act_hdr *h = a->priv;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 if (h == NULL)
598 goto errout;
599
600 /* compat_mode being true specifies a call that is supposed
601 * to add additional backward compatiblity statistic TLVs.
602 */
603 if (compat_mode) {
604 if (a->type == TCA_OLD_COMPAT)
605 err = gnet_stats_start_copy_compat(skb, 0,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700606 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 else
608 return 0;
609 } else
610 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
Patrick McHardy4bdf3992007-07-02 22:47:37 -0700611 &h->tcf_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613 if (err < 0)
614 goto errout;
615
616 if (a->ops != NULL && a->ops->get_stats != NULL)
617 if (a->ops->get_stats(skb, a) < 0)
618 goto errout;
619
David S. Millere9ce1cd2006-08-21 23:54:55 -0700620 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000621 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
622 &h->tcf_rate_est) < 0 ||
David S. Millere9ce1cd2006-08-21 23:54:55 -0700623 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 goto errout;
625
626 if (gnet_stats_finish_copy(&d) < 0)
627 goto errout;
628
629 return 0;
630
631errout:
632 return -1;
633}
634
635static int
636tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900637 u16 flags, int event, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 struct tcamsg *t;
640 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700641 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800642 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700644 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 t = NLMSG_DATA(nlh);
647 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700648 t->tca__pad1 = 0;
649 t->tca__pad2 = 0;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900650
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800651 nest = nla_nest_start(skb, TCA_ACT_TAB);
652 if (nest == NULL)
653 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 if (tcf_action_dump(skb, a, bind, ref) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800656 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800658 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900659
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700660 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 return skb->len;
662
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800663nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664nlmsg_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700665 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 return -1;
667}
668
669static int
670act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
671{
672 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
674 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
675 if (!skb)
676 return -ENOBUFS;
677 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
678 kfree_skb(skb);
679 return -EINVAL;
680 }
Thomas Graf2942e902006-08-15 00:30:25 -0700681
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800682 return rtnl_unicast(skb, &init_net, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
685static struct tc_action *
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800686tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800688 struct nlattr *tb[TCA_ACT_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 struct tc_action *a;
690 int index;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800691 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Patrick McHardycee63722008-01-23 20:33:32 -0800693 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
694 if (err < 0)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800695 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Patrick McHardycee63722008-01-23 20:33:32 -0800697 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800698 if (tb[TCA_ACT_INDEX] == NULL ||
699 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800700 goto err_out;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800701 index = nla_get_u32(tb[TCA_ACT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800703 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700704 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (a == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800706 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800708 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800709 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 if (a->ops == NULL)
711 goto err_free;
712 if (a->ops->lookup == NULL)
713 goto err_mod;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800714 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 if (a->ops->lookup(a, index) == 0)
716 goto err_mod;
717
718 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 return a;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800720
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721err_mod:
722 module_put(a->ops->owner);
723err_free:
724 kfree(a);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800725err_out:
726 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727}
728
729static void cleanup_a(struct tc_action *act)
730{
731 struct tc_action *a;
732
733 for (a = act; a; a = act) {
734 act = a->next;
735 kfree(a);
736 }
737}
738
739static struct tc_action *create_a(int i)
740{
741 struct tc_action *act;
742
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700743 act = kzalloc(sizeof(*act), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 if (act == NULL) {
745 printk("create_a: failed to alloc!\n");
746 return NULL;
747 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 act->order = i;
749 return act;
750}
751
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800752static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
754 struct sk_buff *skb;
755 unsigned char *b;
756 struct nlmsghdr *nlh;
757 struct tcamsg *t;
758 struct netlink_callback dcb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800759 struct nlattr *nest;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800760 struct nlattr *tb[TCA_ACT_MAX+1];
761 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 struct tc_action *a = create_a(0);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700763 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 if (a == NULL) {
766 printk("tca_action_flush: couldnt create tc_action\n");
767 return err;
768 }
769
770 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
771 if (!skb) {
772 printk("tca_action_flush: failed skb alloc\n");
773 kfree(a);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700774 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 }
776
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700777 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Patrick McHardycee63722008-01-23 20:33:32 -0800779 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
780 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 goto err_out;
782
Patrick McHardycee63722008-01-23 20:33:32 -0800783 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800784 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 a->ops = tc_lookup_action(kind);
786 if (a->ops == NULL)
787 goto err_out;
788
789 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
790 t = NLMSG_DATA(nlh);
791 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700792 t->tca__pad1 = 0;
793 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800795 nest = nla_nest_start(skb, TCA_ACT_TAB);
796 if (nest == NULL)
797 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
799 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
800 if (err < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800801 goto nla_put_failure;
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700802 if (err == 0)
803 goto noflush_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800805 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700807 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 nlh->nlmsg_flags |= NLM_F_ROOT;
809 module_put(a->ops->owner);
810 kfree(a);
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800811 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 if (err > 0)
813 return 0;
814
815 return err;
816
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800817nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818nlmsg_failure:
Thomas Grafebbaeab2006-07-09 11:36:23 -0700819 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820err_out:
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700821noflush_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 kfree_skb(skb);
823 kfree(a);
824 return err;
825}
826
827static int
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800828tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829{
Patrick McHardycee63722008-01-23 20:33:32 -0800830 int i, ret;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800831 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 struct tc_action *head = NULL, *act, *act_prev = NULL;
833
Patrick McHardycee63722008-01-23 20:33:32 -0800834 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
835 if (ret < 0)
836 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
838 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700839 if (tb[1] != NULL)
840 return tca_action_flush(tb[1], n, pid);
841 else
842 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 }
844
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800845 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800846 act = tcf_action_get_1(tb[i], n, pid);
847 if (IS_ERR(act)) {
848 ret = PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 goto err;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800850 }
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800851 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 if (head == NULL)
854 head = act;
855 else
856 act_prev->next = act;
857 act_prev = act;
858 }
859
860 if (event == RTM_GETACTION)
861 ret = act_get_notify(pid, n, head, event);
862 else { /* delete */
863 struct sk_buff *skb;
864
865 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
866 if (!skb) {
867 ret = -ENOBUFS;
868 goto err;
869 }
870
871 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900872 0, 1) <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 kfree_skb(skb);
874 ret = -EINVAL;
875 goto err;
876 }
877
878 /* now do the delete */
879 tcf_action_destroy(head, 0);
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800880 ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900881 n->nlmsg_flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 if (ret > 0)
883 return 0;
884 return ret;
885 }
886err:
887 cleanup_a(head);
888 return ret;
889}
890
891static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900892 u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893{
894 struct tcamsg *t;
895 struct nlmsghdr *nlh;
896 struct sk_buff *skb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800897 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 unsigned char *b;
899 int err = 0;
900
901 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
902 if (!skb)
903 return -ENOBUFS;
904
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700905 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700907 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 t = NLMSG_DATA(nlh);
909 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700910 t->tca__pad1 = 0;
911 t->tca__pad2 = 0;
912
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800913 nest = nla_nest_start(skb, TCA_ACT_TAB);
914 if (nest == NULL)
915 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
917 if (tcf_action_dump(skb, a, 0, 0) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800918 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800920 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900921
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700922 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Patrick McHardyac6d4392005-08-14 19:29:52 -0700923 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900924
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800925 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (err > 0)
927 err = 0;
928 return err;
929
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800930nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931nlmsg_failure:
Patrick McHardyf6e57462006-03-12 20:33:22 -0800932 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 return -1;
934}
935
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937static int
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800938tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
940 int ret = 0;
941 struct tc_action *act;
942 struct tc_action *a;
943 u32 seq = n->nlmsg_seq;
944
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800945 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 if (act == NULL)
947 goto done;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800948 if (IS_ERR(act)) {
949 ret = PTR_ERR(act);
950 goto done;
951 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 /* dump then free all the actions after update; inserted policy
954 * stays intact
955 * */
956 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
957 for (a = act; a; a = act) {
958 act = a->next;
959 kfree(a);
960 }
961done:
962 return ret;
963}
964
965static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
966{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900967 struct net *net = sock_net(skb->sk);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800968 struct nlattr *tca[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
970 int ret = 0, ovr = 0;
971
Denis V. Lunevb8542722007-12-01 00:21:31 +1100972 if (net != &init_net)
973 return -EINVAL;
974
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800975 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
976 if (ret < 0)
977 return ret;
978
979 if (tca[TCA_ACT_TAB] == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 printk("tc_ctl_action: received NO action attribs\n");
981 return -EINVAL;
982 }
983
984 /* n->nlmsg_flags&NLM_F_CREATE
985 * */
986 switch (n->nlmsg_type) {
987 case RTM_NEWACTION:
988 /* we are going to assume all other flags
989 * imply create only if it doesnt exist
990 * Note that CREATE | EXCL implies that
991 * but since we want avoid ambiguity (eg when flags
992 * is zero) then just set this
993 */
994 if (n->nlmsg_flags&NLM_F_REPLACE)
995 ovr = 1;
996replay:
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800997 ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 if (ret == -EAGAIN)
999 goto replay;
1000 break;
1001 case RTM_DELACTION:
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001002 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 break;
1004 case RTM_GETACTION:
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001005 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 break;
1007 default:
1008 BUG();
1009 }
1010
1011 return ret;
1012}
1013
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001014static struct nlattr *
Patrick McHardy3a6c2b42009-08-25 16:07:40 +02001015find_dump_kind(const struct nlmsghdr *n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001017 struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
1018 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1019 struct nlattr *nla[TCAA_MAX + 1];
1020 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
Patrick McHardyc96c9472008-01-23 20:32:58 -08001022 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001024 tb1 = nla[TCA_ACT_TAB];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (tb1 == NULL)
1026 return NULL;
1027
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001028 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1029 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
Patrick McHardy6d834e02008-01-23 20:32:42 -08001032 if (tb[1] == NULL)
1033 return NULL;
1034 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1035 nla_len(tb[1]), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001037 kind = tb2[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Thomas Graf26dab892006-07-05 20:45:06 -07001039 return kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040}
1041
1042static int
1043tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1044{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001045 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001047 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001048 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 struct tc_action_ops *a_o;
1050 struct tc_action a;
1051 int ret = 0;
1052 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001053 struct nlattr *kind = find_dump_kind(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Denis V. Lunevb8542722007-12-01 00:21:31 +11001055 if (net != &init_net)
1056 return 0;
1057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 if (kind == NULL) {
1059 printk("tc_dump_action: action bad kind\n");
1060 return 0;
1061 }
1062
Thomas Graf26dab892006-07-05 20:45:06 -07001063 a_o = tc_lookup_action(kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 if (a_o == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 return 0;
1066 }
1067
1068 memset(&a, 0, sizeof(struct tc_action));
1069 a.ops = a_o;
1070
1071 if (a_o->walk == NULL) {
Thomas Graf26dab892006-07-05 20:45:06 -07001072 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001073 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 }
1075
1076 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001077 cb->nlh->nlmsg_type, sizeof(*t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 t = NLMSG_DATA(nlh);
1079 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001080 t->tca__pad1 = 0;
1081 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001083 nest = nla_nest_start(skb, TCA_ACT_TAB);
1084 if (nest == NULL)
1085 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
1087 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1088 if (ret < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001089 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 if (ret > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001092 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 ret = skb->len;
1094 } else
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001095 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001097 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 if (NETLINK_CB(cb->skb).pid && ret)
1099 nlh->nlmsg_flags |= NLM_F_MULTI;
1100 module_put(a_o->owner);
1101 return skb->len;
1102
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001103nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104nlmsg_failure:
1105 module_put(a_o->owner);
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001106 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 return skb->len;
1108}
1109
1110static int __init tc_action_init(void)
1111{
Thomas Graf708914c2007-03-22 11:56:59 -07001112 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1113 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1114 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 return 0;
1117}
1118
1119subsys_initcall(tc_action_init);