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Linux 2.6.31.5
[linux-2.6/verdex.git] / net / sched / act_api.c
blob9d03cc33b6ccbfab51e3fe65eadd10b3b84eb101
1 /*
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 <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/kmod.h>
21 #include <linux/err.h>
22 #include <net/net_namespace.h>
23 #include <net/sock.h>
24 #include <net/sch_generic.h>
25 #include <net/act_api.h>
26 #include <net/netlink.h>
27
28 void 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);
38 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
40 kfree(p);
41 return;
42 }
43 }
44 WARN_ON(1);
45 }
46 EXPORT_SYMBOL(tcf_hash_destroy);
47
48 int 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--;
58 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
59 tcf_hash_destroy(p, hinfo);
60 ret = 1;
61 }
62 }
63 return ret;
64 }
65 EXPORT_SYMBOL(tcf_hash_release);
66
67 static 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;
72 struct nlattr *nest;
73
74 read_lock_bh(hinfo->lock);
75
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;
87
88 nest = nla_nest_start(skb, a->order);
89 if (nest == NULL)
90 goto nla_put_failure;
91 err = tcf_action_dump_1(skb, a, 0, 0);
92 if (err < 0) {
93 index--;
94 nlmsg_trim(skb, nest);
95 goto done;
96 }
97 nla_nest_end(skb, nest);
98 n_i++;
99 if (n_i >= TCA_ACT_MAX_PRIO)
100 goto done;
101 }
102 }
103 done:
104 read_unlock_bh(hinfo->lock);
105 if (n_i)
106 cb->args[0] += n_i;
107 return n_i;
108
109 nla_put_failure:
110 nla_nest_cancel(skb, nest);
111 goto done;
112 }
113
114 static 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;
118 struct nlattr *nest;
119 int i= 0, n_i = 0;
120
121 nest = nla_nest_start(skb, a->order);
122 if (nest == NULL)
123 goto nla_put_failure;
124 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
125 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 }
136 NLA_PUT_U32(skb, TCA_FCNT, n_i);
137 nla_nest_end(skb, nest);
138
139 return n_i;
140 nla_put_failure:
141 nla_nest_cancel(skb, nest);
142 return -EINVAL;
143 }
144
145 int 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 }
159 EXPORT_SYMBOL(tcf_generic_walker);
160
161 struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
162 {
163 struct tcf_common *p;
164
165 read_lock_bh(hinfo->lock);
166 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
167 p = p->tcfc_next) {
168 if (p->tcfc_index == index)
169 break;
170 }
171 read_unlock_bh(hinfo->lock);
172
173 return p;
174 }
175 EXPORT_SYMBOL(tcf_hash_lookup);
176
177 u32 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 }
188 EXPORT_SYMBOL(tcf_hash_new_index);
189
190 int 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 }
201 EXPORT_SYMBOL(tcf_hash_search);
202
203 struct 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) {
208 if (bind)
209 p->tcfc_bindcnt++;
210 p->tcfc_refcnt++;
211 a->priv = p;
212 }
213 return p;
214 }
215 EXPORT_SYMBOL(tcf_hash_check);
216
217 struct 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)
220 {
221 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
222
223 if (unlikely(!p))
224 return ERR_PTR(-ENOMEM);
225 p->tcfc_refcnt = 1;
226 if (bind)
227 p->tcfc_bindcnt = 1;
228
229 spin_lock_init(&p->tcfc_lock);
230 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
231 p->tcfc_tm.install = jiffies;
232 p->tcfc_tm.lastuse = jiffies;
233 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
242 a->priv = (void *) p;
243 return p;
244 }
245 EXPORT_SYMBOL(tcf_hash_create);
246
247 void 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 }
256 EXPORT_SYMBOL(tcf_hash_insert);
257
258 static struct tc_action_ops *act_base = NULL;
259 static DEFINE_RWLOCK(act_mod_lock);
260
261 int 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 }
277 EXPORT_SYMBOL(tcf_register_action);
278
279 int 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 }
296 EXPORT_SYMBOL(tcf_unregister_action);
297
298 /* lookup by name */
299 static 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
319 /* lookup by nlattr */
320 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
321 {
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) {
327 if (nla_strcmp(kind, a->kind) == 0) {
328 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 */
342 static 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
363 int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
364 struct tcf_result *res)
365 {
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);
371 ret = TC_ACT_OK;
372 goto exec_done;
373 }
374 while ((a = act) != NULL) {
375 repeat:
376 if (a->ops && a->ops->act) {
377 ret = a->ops->act(skb, a, res);
378 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 }
383 if (ret == TC_ACT_REPEAT)
384 goto repeat; /* we need a ttl - JHS */
385 if (ret != TC_ACT_PIPE)
386 goto exec_done;
387 }
388 act = a->next;
389 }
390 exec_done:
391 return ret;
392 }
393 EXPORT_SYMBOL(tcf_action_exec);
394
395 void 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) {
401 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
413 int
414 tcf_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
423 int
424 tcf_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_pointer(skb);
428 struct nlattr *nest;
429
430 if (a->ops == NULL || a->ops->dump == NULL)
431 return err;
432
433 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
434 if (tcf_action_copy_stats(skb, a, 0))
435 goto nla_put_failure;
436 nest = nla_nest_start(skb, TCA_OPTIONS);
437 if (nest == NULL)
438 goto nla_put_failure;
439 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
440 nla_nest_end(skb, nest);
441 return err;
442 }
443
444 nla_put_failure:
445 nlmsg_trim(skb, b);
446 return -1;
447 }
448 EXPORT_SYMBOL(tcf_action_dump_1);
449
450 int
451 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
452 {
453 struct tc_action *a;
454 int err = -EINVAL;
455 struct nlattr *nest;
456
457 while ((a = act) != NULL) {
458 act = a->next;
459 nest = nla_nest_start(skb, a->order);
460 if (nest == NULL)
461 goto nla_put_failure;
462 err = tcf_action_dump_1(skb, a, bind, ref);
463 if (err < 0)
464 goto errout;
465 nla_nest_end(skb, nest);
466 }
467
468 return 0;
469
470 nla_put_failure:
471 err = -EINVAL;
472 errout:
473 nla_nest_cancel(skb, nest);
474 return err;
475 }
476
477 struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
478 char *name, int ovr, int bind)
479 {
480 struct tc_action *a;
481 struct tc_action_ops *a_o;
482 char act_name[IFNAMSIZ];
483 struct nlattr *tb[TCA_ACT_MAX+1];
484 struct nlattr *kind;
485 int err;
486
487 if (name == NULL) {
488 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
489 if (err < 0)
490 goto err_out;
491 err = -EINVAL;
492 kind = tb[TCA_ACT_KIND];
493 if (kind == NULL)
494 goto err_out;
495 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
496 goto err_out;
497 } else {
498 err = -EINVAL;
499 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) {
505 #ifdef CONFIG_MODULES
506 rtnl_unlock();
507 request_module("act_%s", act_name);
508 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) {
519 err = -EAGAIN;
520 goto err_mod;
521 }
522 #endif
523 err = -ENOENT;
524 goto err_out;
525 }
526
527 err = -ENOMEM;
528 a = kzalloc(sizeof(*a), GFP_KERNEL);
529 if (a == NULL)
530 goto err_mod;
531
532 /* backward compatibility for policer */
533 if (name == NULL)
534 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
535 else
536 err = a_o->init(nla, est, a, ovr, bind);
537 if (err < 0)
538 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 */
544 if (err != ACT_P_CREATED)
545 module_put(a_o->owner);
546 a->ops = a_o;
547
548 return a;
549
550 err_free:
551 kfree(a);
552 err_mod:
553 module_put(a_o->owner);
554 err_out:
555 return ERR_PTR(err);
556 }
557
558 struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
559 char *name, int ovr, int bind)
560 {
561 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
562 struct tc_action *head = NULL, *act, *act_prev = NULL;
563 int err;
564 int i;
565
566 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
567 if (err < 0)
568 return ERR_PTR(err);
569
570 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
571 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
572 if (IS_ERR(act))
573 goto err;
574 act->order = i;
575
576 if (head == NULL)
577 head = act;
578 else
579 act_prev->next = act;
580 act_prev = act;
581 }
582 return head;
583
584 err:
585 if (head != NULL)
586 tcf_action_destroy(head, bind);
587 return act;
588 }
589
590 int 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;
596
597 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,
606 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
607 else
608 return 0;
609 } else
610 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
611 &h->tcf_lock, &d);
612
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
620 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
621 gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
622 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
623 goto errout;
624
625 if (gnet_stats_finish_copy(&d) < 0)
626 goto errout;
627
628 return 0;
629
630 errout:
631 return -1;
632 }
633
634 static int
635 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
636 u16 flags, int event, int bind, int ref)
637 {
638 struct tcamsg *t;
639 struct nlmsghdr *nlh;
640 unsigned char *b = skb_tail_pointer(skb);
641 struct nlattr *nest;
642
643 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
644
645 t = NLMSG_DATA(nlh);
646 t->tca_family = AF_UNSPEC;
647 t->tca__pad1 = 0;
648 t->tca__pad2 = 0;
649
650 nest = nla_nest_start(skb, TCA_ACT_TAB);
651 if (nest == NULL)
652 goto nla_put_failure;
653
654 if (tcf_action_dump(skb, a, bind, ref) < 0)
655 goto nla_put_failure;
656
657 nla_nest_end(skb, nest);
658
659 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
660 return skb->len;
661
662 nla_put_failure:
663 nlmsg_failure:
664 nlmsg_trim(skb, b);
665 return -1;
666 }
667
668 static int
669 act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
670 {
671 struct sk_buff *skb;
672
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 }
680
681 return rtnl_unicast(skb, &init_net, pid);
682 }
683
684 static struct tc_action *
685 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
686 {
687 struct nlattr *tb[TCA_ACT_MAX+1];
688 struct tc_action *a;
689 int index;
690 int err;
691
692 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
693 if (err < 0)
694 goto err_out;
695
696 err = -EINVAL;
697 if (tb[TCA_ACT_INDEX] == NULL ||
698 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
699 goto err_out;
700 index = nla_get_u32(tb[TCA_ACT_INDEX]);
701
702 err = -ENOMEM;
703 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
704 if (a == NULL)
705 goto err_out;
706
707 err = -EINVAL;
708 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
709 if (a->ops == NULL)
710 goto err_free;
711 if (a->ops->lookup == NULL)
712 goto err_mod;
713 err = -ENOENT;
714 if (a->ops->lookup(a, index) == 0)
715 goto err_mod;
716
717 module_put(a->ops->owner);
718 return a;
719
720 err_mod:
721 module_put(a->ops->owner);
722 err_free:
723 kfree(a);
724 err_out:
725 return ERR_PTR(err);
726 }
727
728 static 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
738 static struct tc_action *create_a(int i)
739 {
740 struct tc_action *act;
741
742 act = kzalloc(sizeof(*act), GFP_KERNEL);
743 if (act == NULL) {
744 printk("create_a: failed to alloc!\n");
745 return NULL;
746 }
747 act->order = i;
748 return act;
749 }
750
751 static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
752 {
753 struct sk_buff *skb;
754 unsigned char *b;
755 struct nlmsghdr *nlh;
756 struct tcamsg *t;
757 struct netlink_callback dcb;
758 struct nlattr *nest;
759 struct nlattr *tb[TCA_ACT_MAX+1];
760 struct nlattr *kind;
761 struct tc_action *a = create_a(0);
762 int err = -ENOMEM;
763
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);
773 return err;
774 }
775
776 b = skb_tail_pointer(skb);
777
778 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
779 if (err < 0)
780 goto err_out;
781
782 err = -EINVAL;
783 kind = tb[TCA_ACT_KIND];
784 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;
791 t->tca__pad1 = 0;
792 t->tca__pad2 = 0;
793
794 nest = nla_nest_start(skb, TCA_ACT_TAB);
795 if (nest == NULL)
796 goto nla_put_failure;
797
798 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
799 if (err < 0)
800 goto nla_put_failure;
801 if (err == 0)
802 goto noflush_out;
803
804 nla_nest_end(skb, nest);
805
806 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
807 nlh->nlmsg_flags |= NLM_F_ROOT;
808 module_put(a->ops->owner);
809 kfree(a);
810 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
811 if (err > 0)
812 return 0;
813
814 return err;
815
816 nla_put_failure:
817 nlmsg_failure:
818 module_put(a->ops->owner);
819 err_out:
820 noflush_out:
821 kfree_skb(skb);
822 kfree(a);
823 return err;
824 }
825
826 static int
827 tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
828 {
829 int i, ret;
830 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
831 struct tc_action *head = NULL, *act, *act_prev = NULL;
832
833 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
834 if (ret < 0)
835 return ret;
836
837 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
838 if (tb[1] != NULL)
839 return tca_action_flush(tb[1], n, pid);
840 else
841 return -EINVAL;
842 }
843
844 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
845 act = tcf_action_get_1(tb[i], n, pid);
846 if (IS_ERR(act)) {
847 ret = PTR_ERR(act);
848 goto err;
849 }
850 act->order = i;
851
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,
871 0, 1) <= 0) {
872 kfree_skb(skb);
873 ret = -EINVAL;
874 goto err;
875 }
876
877 /* now do the delete */
878 tcf_action_destroy(head, 0);
879 ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
880 n->nlmsg_flags&NLM_F_ECHO);
881 if (ret > 0)
882 return 0;
883 return ret;
884 }
885 err:
886 cleanup_a(head);
887 return ret;
888 }
889
890 static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
891 u16 flags)
892 {
893 struct tcamsg *t;
894 struct nlmsghdr *nlh;
895 struct sk_buff *skb;
896 struct nlattr *nest;
897 unsigned char *b;
898 int err = 0;
899
900 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
901 if (!skb)
902 return -ENOBUFS;
903
904 b = skb_tail_pointer(skb);
905
906 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
907 t = NLMSG_DATA(nlh);
908 t->tca_family = AF_UNSPEC;
909 t->tca__pad1 = 0;
910 t->tca__pad2 = 0;
911
912 nest = nla_nest_start(skb, TCA_ACT_TAB);
913 if (nest == NULL)
914 goto nla_put_failure;
915
916 if (tcf_action_dump(skb, a, 0, 0) < 0)
917 goto nla_put_failure;
918
919 nla_nest_end(skb, nest);
920
921 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
922 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
923
924 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
925 if (err > 0)
926 err = 0;
927 return err;
928
929 nla_put_failure:
930 nlmsg_failure:
931 kfree_skb(skb);
932 return -1;
933 }
934
935
936 static int
937 tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
938 {
939 int ret = 0;
940 struct tc_action *act;
941 struct tc_action *a;
942 u32 seq = n->nlmsg_seq;
943
944 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
945 if (act == NULL)
946 goto done;
947 if (IS_ERR(act)) {
948 ret = PTR_ERR(act);
949 goto done;
950 }
951
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 }
960 done:
961 return ret;
962 }
963
964 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
965 {
966 struct net *net = sock_net(skb->sk);
967 struct nlattr *tca[TCA_ACT_MAX + 1];
968 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
969 int ret = 0, ovr = 0;
970
971 if (net != &init_net)
972 return -EINVAL;
973
974 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) {
979 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;
995 replay:
996 ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr);
997 if (ret == -EAGAIN)
998 goto replay;
999 break;
1000 case RTM_DELACTION:
1001 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION);
1002 break;
1003 case RTM_GETACTION:
1004 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION);
1005 break;
1006 default:
1007 BUG();
1008 }
1009
1010 return ret;
1011 }
1012
1013 static struct nlattr *
1014 find_dump_kind(struct nlmsghdr *n)
1015 {
1016 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;
1020
1021 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1022 return NULL;
1023 tb1 = nla[TCA_ACT_TAB];
1024 if (tb1 == NULL)
1025 return NULL;
1026
1027 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1028 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1029 return NULL;
1030
1031 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)
1035 return NULL;
1036 kind = tb2[TCA_ACT_KIND];
1037
1038 return kind;
1039 }
1040
1041 static int
1042 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1043 {
1044 struct net *net = sock_net(skb->sk);
1045 struct nlmsghdr *nlh;
1046 unsigned char *b = skb_tail_pointer(skb);
1047 struct nlattr *nest;
1048 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);
1052 struct nlattr *kind = find_dump_kind(cb->nlh);
1053
1054 if (net != &init_net)
1055 return 0;
1056
1057 if (kind == NULL) {
1058 printk("tc_dump_action: action bad kind\n");
1059 return 0;
1060 }
1061
1062 a_o = tc_lookup_action(kind);
1063 if (a_o == NULL) {
1064 return 0;
1065 }
1066
1067 memset(&a, 0, sizeof(struct tc_action));
1068 a.ops = a_o;
1069
1070 if (a_o->walk == NULL) {
1071 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
1072 goto nla_put_failure;
1073 }
1074
1075 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1076 cb->nlh->nlmsg_type, sizeof(*t));
1077 t = NLMSG_DATA(nlh);
1078 t->tca_family = AF_UNSPEC;
1079 t->tca__pad1 = 0;
1080 t->tca__pad2 = 0;
1081
1082 nest = nla_nest_start(skb, TCA_ACT_TAB);
1083 if (nest == NULL)
1084 goto nla_put_failure;
1085
1086 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1087 if (ret < 0)
1088 goto nla_put_failure;
1089
1090 if (ret > 0) {
1091 nla_nest_end(skb, nest);
1092 ret = skb->len;
1093 } else
1094 nla_nest_cancel(skb, nest);
1095
1096 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1097 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
1102 nla_put_failure:
1103 nlmsg_failure:
1104 module_put(a_o->owner);
1105 nlmsg_trim(skb, b);
1106 return skb->len;
1107 }
1108
1109 static int __init tc_action_init(void)
1110 {
1111 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);
1114
1115 return 0;
1116 }
1117
1118 subsys_initcall(tc_action_init);
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