blob: 9d03cc33b6ccbfab51e3fe65eadd10b3b84eb101 [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 ||
David S. Millere9ce1cd2006-08-21 23:54:55 -0700621 gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
David S. Millere9ce1cd2006-08-21 23:54:55 -0700622 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 goto errout;
624
625 if (gnet_stats_finish_copy(&d) < 0)
626 goto errout;
627
628 return 0;
629
630errout:
631 return -1;
632}
633
634static int
635tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900636 u16 flags, int event, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637{
638 struct tcamsg *t;
639 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700640 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800641 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700643 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 t = NLMSG_DATA(nlh);
646 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700647 t->tca__pad1 = 0;
648 t->tca__pad2 = 0;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900649
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800650 nest = nla_nest_start(skb, TCA_ACT_TAB);
651 if (nest == NULL)
652 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
654 if (tcf_action_dump(skb, a, bind, ref) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800655 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800657 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900658
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700659 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return skb->len;
661
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800662nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663nlmsg_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700664 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 return -1;
666}
667
668static int
669act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
670{
671 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
674 if (!skb)
675 return -ENOBUFS;
676 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
677 kfree_skb(skb);
678 return -EINVAL;
679 }
Thomas Graf2942e902006-08-15 00:30:25 -0700680
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800681 return rtnl_unicast(skb, &init_net, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
684static struct tc_action *
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800685tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800687 struct nlattr *tb[TCA_ACT_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 struct tc_action *a;
689 int index;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800690 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Patrick McHardycee63722008-01-23 20:33:32 -0800692 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
693 if (err < 0)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800694 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Patrick McHardycee63722008-01-23 20:33:32 -0800696 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800697 if (tb[TCA_ACT_INDEX] == NULL ||
698 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800699 goto err_out;
Patrick McHardy1587bac2008-01-23 20:35:03 -0800700 index = nla_get_u32(tb[TCA_ACT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800702 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700703 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 if (a == NULL)
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800705 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800707 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800708 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 if (a->ops == NULL)
710 goto err_free;
711 if (a->ops->lookup == NULL)
712 goto err_mod;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800713 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 if (a->ops->lookup(a, index) == 0)
715 goto err_mod;
716
717 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return a;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720err_mod:
721 module_put(a->ops->owner);
722err_free:
723 kfree(a);
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800724err_out:
725 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728static void cleanup_a(struct tc_action *act)
729{
730 struct tc_action *a;
731
732 for (a = act; a; a = act) {
733 act = a->next;
734 kfree(a);
735 }
736}
737
738static struct tc_action *create_a(int i)
739{
740 struct tc_action *act;
741
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700742 act = kzalloc(sizeof(*act), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (act == NULL) {
744 printk("create_a: failed to alloc!\n");
745 return NULL;
746 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 act->order = i;
748 return act;
749}
750
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800751static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
753 struct sk_buff *skb;
754 unsigned char *b;
755 struct nlmsghdr *nlh;
756 struct tcamsg *t;
757 struct netlink_callback dcb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800758 struct nlattr *nest;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800759 struct nlattr *tb[TCA_ACT_MAX+1];
760 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 struct tc_action *a = create_a(0);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700762 int err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764 if (a == NULL) {
765 printk("tca_action_flush: couldnt create tc_action\n");
766 return err;
767 }
768
769 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
770 if (!skb) {
771 printk("tca_action_flush: failed skb alloc\n");
772 kfree(a);
Jamal Hadi Salim36723872008-08-13 02:41:45 -0700773 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700776 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Patrick McHardycee63722008-01-23 20:33:32 -0800778 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
779 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 goto err_out;
781
Patrick McHardycee63722008-01-23 20:33:32 -0800782 err = -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800783 kind = tb[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 a->ops = tc_lookup_action(kind);
785 if (a->ops == NULL)
786 goto err_out;
787
788 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
789 t = NLMSG_DATA(nlh);
790 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700791 t->tca__pad1 = 0;
792 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800794 nest = nla_nest_start(skb, TCA_ACT_TAB);
795 if (nest == NULL)
796 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
799 if (err < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800800 goto nla_put_failure;
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700801 if (err == 0)
802 goto noflush_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800804 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700806 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 nlh->nlmsg_flags |= NLM_F_ROOT;
808 module_put(a->ops->owner);
809 kfree(a);
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800810 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 if (err > 0)
812 return 0;
813
814 return err;
815
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800816nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817nlmsg_failure:
Thomas Grafebbaeab2006-07-09 11:36:23 -0700818 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819err_out:
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700820noflush_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 kfree_skb(skb);
822 kfree(a);
823 return err;
824}
825
826static int
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800827tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
Patrick McHardycee63722008-01-23 20:33:32 -0800829 int i, ret;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800830 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 struct tc_action *head = NULL, *act, *act_prev = NULL;
832
Patrick McHardycee63722008-01-23 20:33:32 -0800833 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
834 if (ret < 0)
835 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
837 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
Jamal Hadi Salimf97017c2008-08-13 02:41:22 -0700838 if (tb[1] != NULL)
839 return tca_action_flush(tb[1], n, pid);
840 else
841 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 }
843
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800844 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800845 act = tcf_action_get_1(tb[i], n, pid);
846 if (IS_ERR(act)) {
847 ret = PTR_ERR(act);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 goto err;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800849 }
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800850 act->order = i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
852 if (head == NULL)
853 head = act;
854 else
855 act_prev->next = act;
856 act_prev = act;
857 }
858
859 if (event == RTM_GETACTION)
860 ret = act_get_notify(pid, n, head, event);
861 else { /* delete */
862 struct sk_buff *skb;
863
864 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
865 if (!skb) {
866 ret = -ENOBUFS;
867 goto err;
868 }
869
870 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900871 0, 1) <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 kfree_skb(skb);
873 ret = -EINVAL;
874 goto err;
875 }
876
877 /* now do the delete */
878 tcf_action_destroy(head, 0);
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800879 ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900880 n->nlmsg_flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 if (ret > 0)
882 return 0;
883 return ret;
884 }
885err:
886 cleanup_a(head);
887 return ret;
888}
889
890static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900891 u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892{
893 struct tcamsg *t;
894 struct nlmsghdr *nlh;
895 struct sk_buff *skb;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800896 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 unsigned char *b;
898 int err = 0;
899
900 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
901 if (!skb)
902 return -ENOBUFS;
903
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700904 b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700906 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 t = NLMSG_DATA(nlh);
908 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700909 t->tca__pad1 = 0;
910 t->tca__pad2 = 0;
911
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800912 nest = nla_nest_start(skb, TCA_ACT_TAB);
913 if (nest == NULL)
914 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 if (tcf_action_dump(skb, a, 0, 0) < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800917 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800919 nla_nest_end(skb, nest);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900920
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700921 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Patrick McHardyac6d4392005-08-14 19:29:52 -0700922 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900923
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800924 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 if (err > 0)
926 err = 0;
927 return err;
928
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800929nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930nlmsg_failure:
Patrick McHardyf6e57462006-03-12 20:33:22 -0800931 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 return -1;
933}
934
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936static int
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800937tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938{
939 int ret = 0;
940 struct tc_action *act;
941 struct tc_action *a;
942 u32 seq = n->nlmsg_seq;
943
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800944 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 if (act == NULL)
946 goto done;
Patrick McHardyab27cfb2008-01-23 20:33:13 -0800947 if (IS_ERR(act)) {
948 ret = PTR_ERR(act);
949 goto done;
950 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
952 /* dump then free all the actions after update; inserted policy
953 * stays intact
954 * */
955 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
956 for (a = act; a; a = act) {
957 act = a->next;
958 kfree(a);
959 }
960done:
961 return ret;
962}
963
964static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
965{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900966 struct net *net = sock_net(skb->sk);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800967 struct nlattr *tca[TCA_ACT_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
969 int ret = 0, ovr = 0;
970
Denis V. Lunevb8542722007-12-01 00:21:31 +1100971 if (net != &init_net)
972 return -EINVAL;
973
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800974 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
975 if (ret < 0)
976 return ret;
977
978 if (tca[TCA_ACT_TAB] == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 printk("tc_ctl_action: received NO action attribs\n");
980 return -EINVAL;
981 }
982
983 /* n->nlmsg_flags&NLM_F_CREATE
984 * */
985 switch (n->nlmsg_type) {
986 case RTM_NEWACTION:
987 /* we are going to assume all other flags
988 * imply create only if it doesnt exist
989 * Note that CREATE | EXCL implies that
990 * but since we want avoid ambiguity (eg when flags
991 * is zero) then just set this
992 */
993 if (n->nlmsg_flags&NLM_F_REPLACE)
994 ovr = 1;
995replay:
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800996 ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 if (ret == -EAGAIN)
998 goto replay;
999 break;
1000 case RTM_DELACTION:
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001001 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 break;
1003 case RTM_GETACTION:
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001004 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 break;
1006 default:
1007 BUG();
1008 }
1009
1010 return ret;
1011}
1012
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001013static struct nlattr *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014find_dump_kind(struct nlmsghdr *n)
1015{
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001016 struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
1017 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1018 struct nlattr *nla[TCAA_MAX + 1];
1019 struct nlattr *kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Patrick McHardyc96c9472008-01-23 20:32:58 -08001021 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001023 tb1 = nla[TCA_ACT_TAB];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 if (tb1 == NULL)
1025 return NULL;
1026
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001027 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1028 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Patrick McHardy6d834e02008-01-23 20:32:42 -08001031 if (tb[1] == NULL)
1032 return NULL;
1033 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1034 nla_len(tb[1]), NULL) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 return NULL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001036 kind = tb2[TCA_ACT_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Thomas Graf26dab892006-07-05 20:45:06 -07001038 return kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039}
1040
1041static int
1042tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1043{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001044 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001046 unsigned char *b = skb_tail_pointer(skb);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001047 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 struct tc_action_ops *a_o;
1049 struct tc_action a;
1050 int ret = 0;
1051 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001052 struct nlattr *kind = find_dump_kind(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
Denis V. Lunevb8542722007-12-01 00:21:31 +11001054 if (net != &init_net)
1055 return 0;
1056
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 if (kind == NULL) {
1058 printk("tc_dump_action: action bad kind\n");
1059 return 0;
1060 }
1061
Thomas Graf26dab892006-07-05 20:45:06 -07001062 a_o = tc_lookup_action(kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (a_o == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return 0;
1065 }
1066
1067 memset(&a, 0, sizeof(struct tc_action));
1068 a.ops = a_o;
1069
1070 if (a_o->walk == NULL) {
Thomas Graf26dab892006-07-05 20:45:06 -07001071 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001072 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 }
1074
1075 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001076 cb->nlh->nlmsg_type, sizeof(*t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 t = NLMSG_DATA(nlh);
1078 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001079 t->tca__pad1 = 0;
1080 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001082 nest = nla_nest_start(skb, TCA_ACT_TAB);
1083 if (nest == NULL)
1084 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085
1086 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1087 if (ret < 0)
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001088 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
1090 if (ret > 0) {
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001091 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 ret = skb->len;
1093 } else
Patrick McHardy4b3550ef2008-01-23 20:34:11 -08001094 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001096 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 if (NETLINK_CB(cb->skb).pid && ret)
1098 nlh->nlmsg_flags |= NLM_F_MULTI;
1099 module_put(a_o->owner);
1100 return skb->len;
1101
Patrick McHardy7ba699c2008-01-22 22:11:50 -08001102nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103nlmsg_failure:
1104 module_put(a_o->owner);
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001105 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 return skb->len;
1107}
1108
1109static int __init tc_action_init(void)
1110{
Thomas Graf708914c2007-03-22 11:56:59 -07001111 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1112 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1113 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 return 0;
1116}
1117
1118subsys_initcall(tc_action_init);