blob: 835070e9169cc03b5975709827f752ff6d6576a0 [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
14#include <asm/uaccess.h>
15#include <asm/system.h>
16#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/string.h>
21#include <linux/mm.h>
22#include <linux/socket.h>
23#include <linux/sockios.h>
24#include <linux/in.h>
25#include <linux/errno.h>
26#include <linux/interrupt.h>
27#include <linux/netdevice.h>
28#include <linux/skbuff.h>
29#include <linux/rtnetlink.h>
30#include <linux/init.h>
31#include <linux/kmod.h>
32#include <net/sock.h>
33#include <net/sch_generic.h>
34#include <net/act_api.h>
35
David S. Millere9ce1cd2006-08-21 23:54:55 -070036void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
37{
38 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
39 struct tcf_common **p1p;
40
41 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
42 if (*p1p == p) {
43 write_lock_bh(hinfo->lock);
44 *p1p = p->tcfc_next;
45 write_unlock_bh(hinfo->lock);
46#ifdef CONFIG_NET_ESTIMATOR
47 gen_kill_estimator(&p->tcfc_bstats,
48 &p->tcfc_rate_est);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -070050 kfree(p);
51 return;
52 }
53 }
54 BUG_TRAP(0);
55}
56EXPORT_SYMBOL(tcf_hash_destroy);
57
58int tcf_hash_release(struct tcf_common *p, int bind,
59 struct tcf_hashinfo *hinfo)
60{
61 int ret = 0;
62
63 if (p) {
64 if (bind)
65 p->tcfc_bindcnt--;
66
67 p->tcfc_refcnt--;
68 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
69 tcf_hash_destroy(p, hinfo);
70 ret = 1;
71 }
72 }
73 return ret;
74}
75EXPORT_SYMBOL(tcf_hash_release);
76
77static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
78 struct tc_action *a, struct tcf_hashinfo *hinfo)
79{
80 struct tcf_common *p;
81 int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
82 struct rtattr *r ;
83
84 read_lock(hinfo->lock);
85
86 s_i = cb->args[0];
87
88 for (i = 0; i < (hinfo->hmask + 1); i++) {
89 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
90
91 for (; p; p = p->tcfc_next) {
92 index++;
93 if (index < s_i)
94 continue;
95 a->priv = p;
96 a->order = n_i;
97 r = (struct rtattr*) skb->tail;
98 RTA_PUT(skb, a->order, 0, NULL);
99 err = tcf_action_dump_1(skb, a, 0, 0);
100 if (err < 0) {
101 index--;
102 skb_trim(skb, (u8*)r - skb->data);
103 goto done;
104 }
105 r->rta_len = skb->tail - (u8*)r;
106 n_i++;
107 if (n_i >= TCA_ACT_MAX_PRIO)
108 goto done;
109 }
110 }
111done:
112 read_unlock(hinfo->lock);
113 if (n_i)
114 cb->args[0] += n_i;
115 return n_i;
116
117rtattr_failure:
118 skb_trim(skb, (u8*)r - skb->data);
119 goto done;
120}
121
122static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
123 struct tcf_hashinfo *hinfo)
124{
125 struct tcf_common *p, *s_p;
126 struct rtattr *r ;
127 int i= 0, n_i = 0;
128
129 r = (struct rtattr*) skb->tail;
130 RTA_PUT(skb, a->order, 0, NULL);
131 RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
132 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))
138 module_put(a->ops->owner);
139 n_i++;
140 p = s_p;
141 }
142 }
143 RTA_PUT(skb, TCA_FCNT, 4, &n_i);
144 r->rta_len = skb->tail - (u8*)r;
145
146 return n_i;
147rtattr_failure:
148 skb_trim(skb, (u8*)r - skb->data);
149 return -EINVAL;
150}
151
152int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
153 int type, struct tc_action *a)
154{
155 struct tcf_hashinfo *hinfo = a->ops->hinfo;
156
157 if (type == RTM_DELACTION) {
158 return tcf_del_walker(skb, a, hinfo);
159 } else if (type == RTM_GETACTION) {
160 return tcf_dump_walker(skb, cb, a, hinfo);
161 } else {
162 printk("tcf_generic_walker: unknown action %d\n", type);
163 return -EINVAL;
164 }
165}
166EXPORT_SYMBOL(tcf_generic_walker);
167
168struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
169{
170 struct tcf_common *p;
171
172 read_lock(hinfo->lock);
173 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
174 p = p->tcfc_next) {
175 if (p->tcfc_index == index)
176 break;
177 }
178 read_unlock(hinfo->lock);
179
180 return p;
181}
182EXPORT_SYMBOL(tcf_hash_lookup);
183
184u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
185{
186 u32 val = *idx_gen;
187
188 do {
189 if (++val == 0)
190 val = 1;
191 } while (tcf_hash_lookup(val, hinfo));
192
193 return (*idx_gen = val);
194}
195EXPORT_SYMBOL(tcf_hash_new_index);
196
197int tcf_hash_search(struct tc_action *a, u32 index)
198{
199 struct tcf_hashinfo *hinfo = a->ops->hinfo;
200 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
201
202 if (p) {
203 a->priv = p;
204 return 1;
205 }
206 return 0;
207}
208EXPORT_SYMBOL(tcf_hash_search);
209
210struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
211 struct tcf_hashinfo *hinfo)
212{
213 struct tcf_common *p = NULL;
214 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
215 if (bind) {
216 p->tcfc_bindcnt++;
217 p->tcfc_refcnt++;
218 }
219 a->priv = p;
220 }
221 return p;
222}
223EXPORT_SYMBOL(tcf_hash_check);
224
225struct tcf_common *tcf_hash_create(u32 index, struct rtattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo)
226{
227 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
228
229 if (unlikely(!p))
230 return p;
231 p->tcfc_refcnt = 1;
232 if (bind)
233 p->tcfc_bindcnt = 1;
234
235 spin_lock_init(&p->tcfc_lock);
236 p->tcfc_stats_lock = &p->tcfc_lock;
237 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
238 p->tcfc_tm.install = jiffies;
239 p->tcfc_tm.lastuse = jiffies;
240#ifdef CONFIG_NET_ESTIMATOR
241 if (est)
242 gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
243 p->tcfc_stats_lock, est);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700245 a->priv = (void *) p;
246 return p;
247}
248EXPORT_SYMBOL(tcf_hash_create);
249
250void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
251{
252 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
253
254 write_lock_bh(hinfo->lock);
255 p->tcfc_next = hinfo->htab[h];
256 hinfo->htab[h] = p;
257 write_unlock_bh(hinfo->lock);
258}
259EXPORT_SYMBOL(tcf_hash_insert);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261static struct tc_action_ops *act_base = NULL;
262static DEFINE_RWLOCK(act_mod_lock);
263
264int tcf_register_action(struct tc_action_ops *act)
265{
266 struct tc_action_ops *a, **ap;
267
268 write_lock(&act_mod_lock);
269 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
270 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
271 write_unlock(&act_mod_lock);
272 return -EEXIST;
273 }
274 }
275 act->next = NULL;
276 *ap = act;
277 write_unlock(&act_mod_lock);
278 return 0;
279}
280
281int tcf_unregister_action(struct tc_action_ops *act)
282{
283 struct tc_action_ops *a, **ap;
284 int err = -ENOENT;
285
286 write_lock(&act_mod_lock);
287 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
288 if (a == act)
289 break;
290 if (a) {
291 *ap = a->next;
292 a->next = NULL;
293 err = 0;
294 }
295 write_unlock(&act_mod_lock);
296 return err;
297}
298
299/* lookup by name */
300static struct tc_action_ops *tc_lookup_action_n(char *kind)
301{
302 struct tc_action_ops *a = NULL;
303
304 if (kind) {
305 read_lock(&act_mod_lock);
306 for (a = act_base; a; a = a->next) {
307 if (strcmp(kind, a->kind) == 0) {
308 if (!try_module_get(a->owner)) {
309 read_unlock(&act_mod_lock);
310 return NULL;
311 }
312 break;
313 }
314 }
315 read_unlock(&act_mod_lock);
316 }
317 return a;
318}
319
320/* lookup by rtattr */
321static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
322{
323 struct tc_action_ops *a = NULL;
324
325 if (kind) {
326 read_lock(&act_mod_lock);
327 for (a = act_base; a; a = a->next) {
328 if (rtattr_strcmp(kind, a->kind) == 0) {
329 if (!try_module_get(a->owner)) {
330 read_unlock(&act_mod_lock);
331 return NULL;
332 }
333 break;
334 }
335 }
336 read_unlock(&act_mod_lock);
337 }
338 return a;
339}
340
341#if 0
342/* lookup by id */
343static struct tc_action_ops *tc_lookup_action_id(u32 type)
344{
345 struct tc_action_ops *a = NULL;
346
347 if (type) {
348 read_lock(&act_mod_lock);
349 for (a = act_base; a; a = a->next) {
350 if (a->type == type) {
351 if (!try_module_get(a->owner)) {
352 read_unlock(&act_mod_lock);
353 return NULL;
354 }
355 break;
356 }
357 }
358 read_unlock(&act_mod_lock);
359 }
360 return a;
361}
362#endif
363
364int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
365 struct tcf_result *res)
366{
367 struct tc_action *a;
368 int ret = -1;
369
370 if (skb->tc_verd & TC_NCLS) {
371 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 ret = TC_ACT_OK;
373 goto exec_done;
374 }
375 while ((a = act) != NULL) {
376repeat:
377 if (a->ops && a->ops->act) {
Patrick McHardyf43c5a02006-01-08 22:15:34 -0800378 ret = a->ops->act(skb, a, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (TC_MUNGED & skb->tc_verd) {
380 /* copied already, allow trampling */
381 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
382 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (ret == TC_ACT_REPEAT)
385 goto repeat; /* we need a ttl - JHS */
J Hadi Salim14d50e72005-05-03 16:29:13 -0700386 if (ret != TC_ACT_PIPE)
387 goto exec_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389 act = a->next;
390 }
391exec_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return ret;
393}
394
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;
427 unsigned char *b = skb->tail;
428 struct rtattr *r;
429
430 if (a->ops == NULL || a->ops->dump == NULL)
431 return err;
432
433 RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
434 if (tcf_action_copy_stats(skb, a, 0))
435 goto rtattr_failure;
436 r = (struct rtattr*) skb->tail;
437 RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
438 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
439 r->rta_len = skb->tail - (u8*)r;
440 return err;
441 }
442
443rtattr_failure:
444 skb_trim(skb, b - skb->data);
445 return -1;
446}
447
448int
449tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
450{
451 struct tc_action *a;
452 int err = -EINVAL;
453 unsigned char *b = skb->tail;
454 struct rtattr *r ;
455
456 while ((a = act) != NULL) {
457 r = (struct rtattr*) skb->tail;
458 act = a->next;
459 RTA_PUT(skb, a->order, 0, NULL);
460 err = tcf_action_dump_1(skb, a, bind, ref);
461 if (err < 0)
Thomas Graf4fe683f2006-07-05 20:47:28 -0700462 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 r->rta_len = skb->tail - (u8*)r;
464 }
465
466 return 0;
467
468rtattr_failure:
Thomas Graf4fe683f2006-07-05 20:47:28 -0700469 err = -EINVAL;
470errout:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 skb_trim(skb, b - skb->data);
Thomas Graf4fe683f2006-07-05 20:47:28 -0700472 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473}
474
475struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est,
476 char *name, int ovr, int bind, int *err)
477{
478 struct tc_action *a;
479 struct tc_action_ops *a_o;
480 char act_name[IFNAMSIZ];
481 struct rtattr *tb[TCA_ACT_MAX+1];
482 struct rtattr *kind;
483
484 *err = -EINVAL;
485
486 if (name == NULL) {
487 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
488 goto err_out;
489 kind = tb[TCA_ACT_KIND-1];
490 if (kind == NULL)
491 goto err_out;
492 if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
493 goto err_out;
494 } else {
495 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
496 goto err_out;
497 }
498
499 a_o = tc_lookup_action_n(act_name);
500 if (a_o == NULL) {
501#ifdef CONFIG_KMOD
502 rtnl_unlock();
Patrick McHardy4bba3922006-01-08 22:22:14 -0800503 request_module("act_%s", act_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 rtnl_lock();
505
506 a_o = tc_lookup_action_n(act_name);
507
508 /* We dropped the RTNL semaphore in order to
509 * perform the module load. So, even if we
510 * succeeded in loading the module we have to
511 * tell the caller to replay the request. We
512 * indicate this using -EAGAIN.
513 */
514 if (a_o != NULL) {
515 *err = -EAGAIN;
516 goto err_mod;
517 }
518#endif
Thomas Grafd152b4e2006-07-05 20:45:57 -0700519 *err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 goto err_out;
521 }
522
523 *err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700524 a = kzalloc(sizeof(*a), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (a == NULL)
526 goto err_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 /* backward compatibility for policer */
529 if (name == NULL)
530 *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
531 else
532 *err = a_o->init(rta, est, a, ovr, bind);
533 if (*err < 0)
534 goto err_free;
535
536 /* module count goes up only when brand new policy is created
537 if it exists and is only bound to in a_o->init() then
538 ACT_P_CREATED is not returned (a zero is).
539 */
540 if (*err != ACT_P_CREATED)
541 module_put(a_o->owner);
542 a->ops = a_o;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 *err = 0;
545 return a;
546
547err_free:
548 kfree(a);
549err_mod:
550 module_put(a_o->owner);
551err_out:
552 return NULL;
553}
554
555struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est,
556 char *name, int ovr, int bind, int *err)
557{
558 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
559 struct tc_action *head = NULL, *act, *act_prev = NULL;
560 int i;
561
562 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) {
563 *err = -EINVAL;
564 return head;
565 }
566
567 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
568 act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
569 if (act == NULL)
570 goto err;
571 act->order = i+1;
572
573 if (head == NULL)
574 head = act;
575 else
576 act_prev->next = act;
577 act_prev = act;
578 }
579 return head;
580
581err:
582 if (head != NULL)
583 tcf_action_destroy(head, bind);
584 return NULL;
585}
586
587int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
588 int compat_mode)
589{
590 int err = 0;
591 struct gnet_dump d;
592 struct tcf_act_hdr *h = a->priv;
593
594 if (h == NULL)
595 goto errout;
596
597 /* compat_mode being true specifies a call that is supposed
598 * to add additional backward compatiblity statistic TLVs.
599 */
600 if (compat_mode) {
601 if (a->type == TCA_OLD_COMPAT)
602 err = gnet_stats_start_copy_compat(skb, 0,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700603 TCA_STATS, TCA_XSTATS, h->tcf_stats_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 else
605 return 0;
606 } else
607 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700608 h->tcf_stats_lock, &d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if (err < 0)
611 goto errout;
612
613 if (a->ops != NULL && a->ops->get_stats != NULL)
614 if (a->ops->get_stats(skb, a) < 0)
615 goto errout;
616
David S. Millere9ce1cd2006-08-21 23:54:55 -0700617 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618#ifdef CONFIG_NET_ESTIMATOR
David S. Millere9ce1cd2006-08-21 23:54:55 -0700619 gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620#endif
David S. Millere9ce1cd2006-08-21 23:54:55 -0700621 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 goto errout;
623
624 if (gnet_stats_finish_copy(&d) < 0)
625 goto errout;
626
627 return 0;
628
629errout:
630 return -1;
631}
632
633static int
634tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700635 u16 flags, int event, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
637 struct tcamsg *t;
638 struct nlmsghdr *nlh;
639 unsigned char *b = skb->tail;
640 struct rtattr *x;
641
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700642 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 t = NLMSG_DATA(nlh);
645 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700646 t->tca__pad1 = 0;
647 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 x = (struct rtattr*) skb->tail;
650 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
651
652 if (tcf_action_dump(skb, a, bind, ref) < 0)
653 goto rtattr_failure;
654
655 x->rta_len = skb->tail - (u8*)x;
656
657 nlh->nlmsg_len = skb->tail - b;
658 return skb->len;
659
660rtattr_failure:
661nlmsg_failure:
662 skb_trim(skb, b - skb->data);
663 return -1;
664}
665
666static int
667act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
668{
669 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
672 if (!skb)
673 return -ENOBUFS;
674 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
675 kfree_skb(skb);
676 return -EINVAL;
677 }
Thomas Graf2942e902006-08-15 00:30:25 -0700678
679 return rtnl_unicast(skb, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680}
681
682static struct tc_action *
683tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
684{
685 struct rtattr *tb[TCA_ACT_MAX+1];
686 struct tc_action *a;
687 int index;
688
689 *err = -EINVAL;
690 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
691 return NULL;
692
693 if (tb[TCA_ACT_INDEX - 1] == NULL ||
694 RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
695 return NULL;
696 index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
697
698 *err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700699 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (a == NULL)
701 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 *err = -EINVAL;
704 a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
705 if (a->ops == NULL)
706 goto err_free;
707 if (a->ops->lookup == NULL)
708 goto err_mod;
709 *err = -ENOENT;
710 if (a->ops->lookup(a, index) == 0)
711 goto err_mod;
712
713 module_put(a->ops->owner);
714 *err = 0;
715 return a;
716err_mod:
717 module_put(a->ops->owner);
718err_free:
719 kfree(a);
720 return NULL;
721}
722
723static void cleanup_a(struct tc_action *act)
724{
725 struct tc_action *a;
726
727 for (a = act; a; a = act) {
728 act = a->next;
729 kfree(a);
730 }
731}
732
733static struct tc_action *create_a(int i)
734{
735 struct tc_action *act;
736
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700737 act = kzalloc(sizeof(*act), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (act == NULL) {
739 printk("create_a: failed to alloc!\n");
740 return NULL;
741 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 act->order = i;
743 return act;
744}
745
746static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
747{
748 struct sk_buff *skb;
749 unsigned char *b;
750 struct nlmsghdr *nlh;
751 struct tcamsg *t;
752 struct netlink_callback dcb;
753 struct rtattr *x;
754 struct rtattr *tb[TCA_ACT_MAX+1];
755 struct rtattr *kind;
756 struct tc_action *a = create_a(0);
757 int err = -EINVAL;
758
759 if (a == NULL) {
760 printk("tca_action_flush: couldnt create tc_action\n");
761 return err;
762 }
763
764 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
765 if (!skb) {
766 printk("tca_action_flush: failed skb alloc\n");
767 kfree(a);
768 return -ENOBUFS;
769 }
770
771 b = (unsigned char *)skb->tail;
772
773 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
774 goto err_out;
775
776 kind = tb[TCA_ACT_KIND-1];
777 a->ops = tc_lookup_action(kind);
778 if (a->ops == NULL)
779 goto err_out;
780
781 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
782 t = NLMSG_DATA(nlh);
783 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700784 t->tca__pad1 = 0;
785 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 x = (struct rtattr *) skb->tail;
788 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
789
790 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
791 if (err < 0)
792 goto rtattr_failure;
793
794 x->rta_len = skb->tail - (u8 *) x;
795
796 nlh->nlmsg_len = skb->tail - b;
797 nlh->nlmsg_flags |= NLM_F_ROOT;
798 module_put(a->ops->owner);
799 kfree(a);
Patrick McHardyac6d4392005-08-14 19:29:52 -0700800 err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 if (err > 0)
802 return 0;
803
804 return err;
805
806rtattr_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807nlmsg_failure:
Thomas Grafebbaeab2006-07-09 11:36:23 -0700808 module_put(a->ops->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809err_out:
810 kfree_skb(skb);
811 kfree(a);
812 return err;
813}
814
815static int
816tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
817{
818 int i, ret = 0;
819 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
820 struct tc_action *head = NULL, *act, *act_prev = NULL;
821
822 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
823 return -EINVAL;
824
825 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
826 if (tb[0] != NULL && tb[1] == NULL)
827 return tca_action_flush(tb[0], n, pid);
828 }
829
830 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
831 act = tcf_action_get_1(tb[i], n, pid, &ret);
832 if (act == NULL)
833 goto err;
834 act->order = i+1;
835
836 if (head == NULL)
837 head = act;
838 else
839 act_prev->next = act;
840 act_prev = act;
841 }
842
843 if (event == RTM_GETACTION)
844 ret = act_get_notify(pid, n, head, event);
845 else { /* delete */
846 struct sk_buff *skb;
847
848 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
849 if (!skb) {
850 ret = -ENOBUFS;
851 goto err;
852 }
853
854 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
855 0, 1) <= 0) {
856 kfree_skb(skb);
857 ret = -EINVAL;
858 goto err;
859 }
860
861 /* now do the delete */
862 tcf_action_destroy(head, 0);
Patrick McHardyac6d4392005-08-14 19:29:52 -0700863 ret = rtnetlink_send(skb, pid, RTNLGRP_TC,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 n->nlmsg_flags&NLM_F_ECHO);
865 if (ret > 0)
866 return 0;
867 return ret;
868 }
869err:
870 cleanup_a(head);
871 return ret;
872}
873
874static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700875 u16 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
877 struct tcamsg *t;
878 struct nlmsghdr *nlh;
879 struct sk_buff *skb;
880 struct rtattr *x;
881 unsigned char *b;
882 int err = 0;
883
884 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
885 if (!skb)
886 return -ENOBUFS;
887
888 b = (unsigned char *)skb->tail;
889
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -0700890 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 t = NLMSG_DATA(nlh);
892 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -0700893 t->tca__pad1 = 0;
894 t->tca__pad2 = 0;
895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 x = (struct rtattr*) skb->tail;
897 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
898
899 if (tcf_action_dump(skb, a, 0, 0) < 0)
900 goto rtattr_failure;
901
902 x->rta_len = skb->tail - (u8*)x;
903
904 nlh->nlmsg_len = skb->tail - b;
Patrick McHardyac6d4392005-08-14 19:29:52 -0700905 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Patrick McHardyac6d4392005-08-14 19:29:52 -0700907 err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 if (err > 0)
909 err = 0;
910 return err;
911
912rtattr_failure:
913nlmsg_failure:
Patrick McHardyf6e57462006-03-12 20:33:22 -0800914 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 return -1;
916}
917
918
919static int
920tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
921{
922 int ret = 0;
923 struct tc_action *act;
924 struct tc_action *a;
925 u32 seq = n->nlmsg_seq;
926
927 act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
928 if (act == NULL)
929 goto done;
930
931 /* dump then free all the actions after update; inserted policy
932 * stays intact
933 * */
934 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
935 for (a = act; a; a = act) {
936 act = a->next;
937 kfree(a);
938 }
939done:
940 return ret;
941}
942
943static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
944{
945 struct rtattr **tca = arg;
946 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
947 int ret = 0, ovr = 0;
948
949 if (tca[TCA_ACT_TAB-1] == NULL) {
950 printk("tc_ctl_action: received NO action attribs\n");
951 return -EINVAL;
952 }
953
954 /* n->nlmsg_flags&NLM_F_CREATE
955 * */
956 switch (n->nlmsg_type) {
957 case RTM_NEWACTION:
958 /* we are going to assume all other flags
959 * imply create only if it doesnt exist
960 * Note that CREATE | EXCL implies that
961 * but since we want avoid ambiguity (eg when flags
962 * is zero) then just set this
963 */
964 if (n->nlmsg_flags&NLM_F_REPLACE)
965 ovr = 1;
966replay:
967 ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
968 if (ret == -EAGAIN)
969 goto replay;
970 break;
971 case RTM_DELACTION:
972 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
973 break;
974 case RTM_GETACTION:
975 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
976 break;
977 default:
978 BUG();
979 }
980
981 return ret;
982}
983
Thomas Graf26dab892006-07-05 20:45:06 -0700984static struct rtattr *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985find_dump_kind(struct nlmsghdr *n)
986{
987 struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
988 struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
989 struct rtattr *rta[TCAA_MAX + 1];
990 struct rtattr *kind;
991 int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
992 int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
993 struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
994
995 if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
996 return NULL;
997 tb1 = rta[TCA_ACT_TAB - 1];
998 if (tb1 == NULL)
999 return NULL;
1000
1001 if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
1002 NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
1003 return NULL;
1004 if (tb[0] == NULL)
1005 return NULL;
1006
1007 if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
1008 RTA_PAYLOAD(tb[0])) < 0)
1009 return NULL;
1010 kind = tb2[TCA_ACT_KIND-1];
1011
Thomas Graf26dab892006-07-05 20:45:06 -07001012 return kind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
1015static int
1016tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1017{
1018 struct nlmsghdr *nlh;
1019 unsigned char *b = skb->tail;
1020 struct rtattr *x;
1021 struct tc_action_ops *a_o;
1022 struct tc_action a;
1023 int ret = 0;
1024 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
Thomas Graf26dab892006-07-05 20:45:06 -07001025 struct rtattr *kind = find_dump_kind(cb->nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 if (kind == NULL) {
1028 printk("tc_dump_action: action bad kind\n");
1029 return 0;
1030 }
1031
Thomas Graf26dab892006-07-05 20:45:06 -07001032 a_o = tc_lookup_action(kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (a_o == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 return 0;
1035 }
1036
1037 memset(&a, 0, sizeof(struct tc_action));
1038 a.ops = a_o;
1039
1040 if (a_o->walk == NULL) {
Thomas Graf26dab892006-07-05 20:45:06 -07001041 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 goto rtattr_failure;
1043 }
1044
1045 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1046 cb->nlh->nlmsg_type, sizeof(*t));
1047 t = NLMSG_DATA(nlh);
1048 t->tca_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001049 t->tca__pad1 = 0;
1050 t->tca__pad2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051
1052 x = (struct rtattr *) skb->tail;
1053 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
1054
1055 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1056 if (ret < 0)
1057 goto rtattr_failure;
1058
1059 if (ret > 0) {
1060 x->rta_len = skb->tail - (u8 *) x;
1061 ret = skb->len;
1062 } else
1063 skb_trim(skb, (u8*)x - skb->data);
1064
1065 nlh->nlmsg_len = skb->tail - b;
1066 if (NETLINK_CB(cb->skb).pid && ret)
1067 nlh->nlmsg_flags |= NLM_F_MULTI;
1068 module_put(a_o->owner);
1069 return skb->len;
1070
1071rtattr_failure:
1072nlmsg_failure:
1073 module_put(a_o->owner);
1074 skb_trim(skb, b - skb->data);
1075 return skb->len;
1076}
1077
1078static int __init tc_action_init(void)
1079{
1080 struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
1081
1082 if (link_p) {
1083 link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
1084 link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
1085 link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
1086 link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
1087 }
1088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 return 0;
1090}
1091
1092subsys_initcall(tc_action_init);
1093
1094EXPORT_SYMBOL(tcf_register_action);
1095EXPORT_SYMBOL(tcf_unregister_action);
1096EXPORT_SYMBOL(tcf_action_exec);
1097EXPORT_SYMBOL(tcf_action_dump_1);