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14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/skbuff.h>
20#include <linux/init.h>
21#include <linux/kmod.h>
22#include <linux/err.h>
23#include <net/net_namespace.h>
24#include <net/sock.h>
25#include <net/sch_generic.h>
26#include <net/act_api.h>
27#include <net/netlink.h>
28
29static void tcf_common_free_rcu(struct rcu_head *head)
30{
31 kfree(container_of(head, struct tcf_common, tcfc_rcu));
32}
33
34void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
35{
36 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
37 struct tcf_common **p1p;
38
39 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
40 if (*p1p == p) {
41 write_lock_bh(hinfo->lock);
42 *p1p = p->tcfc_next;
43 write_unlock_bh(hinfo->lock);
44 gen_kill_estimator(&p->tcfc_bstats,
45 &p->tcfc_rate_est);
46
47
48
49
50 call_rcu(&p->tcfc_rcu, tcf_common_free_rcu);
51 return;
52 }
53 }
54 WARN_ON(1);
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 nlattr *nest;
83
84 read_lock_bh(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
98 nest = nla_nest_start(skb, a->order);
99 if (nest == NULL)
100 goto nla_put_failure;
101 err = tcf_action_dump_1(skb, a, 0, 0);
102 if (err < 0) {
103 index--;
104 nlmsg_trim(skb, nest);
105 goto done;
106 }
107 nla_nest_end(skb, nest);
108 n_i++;
109 if (n_i >= TCA_ACT_MAX_PRIO)
110 goto done;
111 }
112 }
113done:
114 read_unlock_bh(hinfo->lock);
115 if (n_i)
116 cb->args[0] += n_i;
117 return n_i;
118
119nla_put_failure:
120 nla_nest_cancel(skb, nest);
121 goto done;
122}
123
124static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
125 struct tcf_hashinfo *hinfo)
126{
127 struct tcf_common *p, *s_p;
128 struct nlattr *nest;
129 int i= 0, n_i = 0;
130
131 nest = nla_nest_start(skb, a->order);
132 if (nest == NULL)
133 goto nla_put_failure;
134 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
137
138 while (p != NULL) {
139 s_p = p->tcfc_next;
140 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
141 module_put(a->ops->owner);
142 n_i++;
143 p = s_p;
144 }
145 }
146 NLA_PUT_U32(skb, TCA_FCNT, n_i);
147 nla_nest_end(skb, nest);
148
149 return n_i;
150nla_put_failure:
151 nla_nest_cancel(skb, nest);
152 return -EINVAL;
153}
154
155int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
156 int type, struct tc_action *a)
157{
158 struct tcf_hashinfo *hinfo = a->ops->hinfo;
159
160 if (type == RTM_DELACTION) {
161 return tcf_del_walker(skb, a, hinfo);
162 } else if (type == RTM_GETACTION) {
163 return tcf_dump_walker(skb, cb, a, hinfo);
164 } else {
165 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
166 return -EINVAL;
167 }
168}
169EXPORT_SYMBOL(tcf_generic_walker);
170
171struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
172{
173 struct tcf_common *p;
174
175 read_lock_bh(hinfo->lock);
176 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
177 p = p->tcfc_next) {
178 if (p->tcfc_index == index)
179 break;
180 }
181 read_unlock_bh(hinfo->lock);
182
183 return p;
184}
185EXPORT_SYMBOL(tcf_hash_lookup);
186
187u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
188{
189 u32 val = *idx_gen;
190
191 do {
192 if (++val == 0)
193 val = 1;
194 } while (tcf_hash_lookup(val, hinfo));
195
196 return (*idx_gen = val);
197}
198EXPORT_SYMBOL(tcf_hash_new_index);
199
200int tcf_hash_search(struct tc_action *a, u32 index)
201{
202 struct tcf_hashinfo *hinfo = a->ops->hinfo;
203 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
204
205 if (p) {
206 a->priv = p;
207 return 1;
208 }
209 return 0;
210}
211EXPORT_SYMBOL(tcf_hash_search);
212
213struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
214 struct tcf_hashinfo *hinfo)
215{
216 struct tcf_common *p = NULL;
217 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
218 if (bind)
219 p->tcfc_bindcnt++;
220 p->tcfc_refcnt++;
221 a->priv = p;
222 }
223 return p;
224}
225EXPORT_SYMBOL(tcf_hash_check);
226
227struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
228 struct tc_action *a, int size, int bind,
229 u32 *idx_gen, struct tcf_hashinfo *hinfo)
230{
231 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
232
233 if (unlikely(!p))
234 return ERR_PTR(-ENOMEM);
235 p->tcfc_refcnt = 1;
236 if (bind)
237 p->tcfc_bindcnt = 1;
238
239 spin_lock_init(&p->tcfc_lock);
240 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
241 p->tcfc_tm.install = jiffies;
242 p->tcfc_tm.lastuse = jiffies;
243 if (est) {
244 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
245 &p->tcfc_lock, est);
246 if (err) {
247 kfree(p);
248 return ERR_PTR(err);
249 }
250 }
251
252 a->priv = (void *) p;
253 return p;
254}
255EXPORT_SYMBOL(tcf_hash_create);
256
257void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
258{
259 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
260
261 write_lock_bh(hinfo->lock);
262 p->tcfc_next = hinfo->htab[h];
263 hinfo->htab[h] = p;
264 write_unlock_bh(hinfo->lock);
265}
266EXPORT_SYMBOL(tcf_hash_insert);
267
268static struct tc_action_ops *act_base = NULL;
269static DEFINE_RWLOCK(act_mod_lock);
270
271int tcf_register_action(struct tc_action_ops *act)
272{
273 struct tc_action_ops *a, **ap;
274
275 write_lock(&act_mod_lock);
276 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
277 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
278 write_unlock(&act_mod_lock);
279 return -EEXIST;
280 }
281 }
282 act->next = NULL;
283 *ap = act;
284 write_unlock(&act_mod_lock);
285 return 0;
286}
287EXPORT_SYMBOL(tcf_register_action);
288
289int tcf_unregister_action(struct tc_action_ops *act)
290{
291 struct tc_action_ops *a, **ap;
292 int err = -ENOENT;
293
294 write_lock(&act_mod_lock);
295 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
296 if (a == act)
297 break;
298 if (a) {
299 *ap = a->next;
300 a->next = NULL;
301 err = 0;
302 }
303 write_unlock(&act_mod_lock);
304 return err;
305}
306EXPORT_SYMBOL(tcf_unregister_action);
307
308
309static struct tc_action_ops *tc_lookup_action_n(char *kind)
310{
311 struct tc_action_ops *a = NULL;
312
313 if (kind) {
314 read_lock(&act_mod_lock);
315 for (a = act_base; a; a = a->next) {
316 if (strcmp(kind, a->kind) == 0) {
317 if (!try_module_get(a->owner)) {
318 read_unlock(&act_mod_lock);
319 return NULL;
320 }
321 break;
322 }
323 }
324 read_unlock(&act_mod_lock);
325 }
326 return a;
327}
328
329
330static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
331{
332 struct tc_action_ops *a = NULL;
333
334 if (kind) {
335 read_lock(&act_mod_lock);
336 for (a = act_base; a; a = a->next) {
337 if (nla_strcmp(kind, a->kind) == 0) {
338 if (!try_module_get(a->owner)) {
339 read_unlock(&act_mod_lock);
340 return NULL;
341 }
342 break;
343 }
344 }
345 read_unlock(&act_mod_lock);
346 }
347 return a;
348}
349
350#if 0
351
352static struct tc_action_ops *tc_lookup_action_id(u32 type)
353{
354 struct tc_action_ops *a = NULL;
355
356 if (type) {
357 read_lock(&act_mod_lock);
358 for (a = act_base; a; a = a->next) {
359 if (a->type == type) {
360 if (!try_module_get(a->owner)) {
361 read_unlock(&act_mod_lock);
362 return NULL;
363 }
364 break;
365 }
366 }
367 read_unlock(&act_mod_lock);
368 }
369 return a;
370}
371#endif
372
373int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
374 struct tcf_result *res)
375{
376 struct tc_action *a;
377 int ret = -1;
378
379 if (skb->tc_verd & TC_NCLS) {
380 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
381 ret = TC_ACT_OK;
382 goto exec_done;
383 }
384 while ((a = act) != NULL) {
385repeat:
386 if (a->ops && a->ops->act) {
387 ret = a->ops->act(skb, a, res);
388 if (TC_MUNGED & skb->tc_verd) {
389
390 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
391 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
392 }
393 if (ret == TC_ACT_REPEAT)
394 goto repeat;
395 if (ret != TC_ACT_PIPE)
396 goto exec_done;
397 }
398 act = a->next;
399 }
400exec_done:
401 return ret;
402}
403EXPORT_SYMBOL(tcf_action_exec);
404
405void tcf_action_destroy(struct tc_action *act, int bind)
406{
407 struct tc_action *a;
408
409 for (a = act; a; a = act) {
410 if (a->ops && a->ops->cleanup) {
411 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
412 module_put(a->ops->owner);
413 act = act->next;
414 kfree(a);
415 } else {
416
417 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
418 act = act->next;
419 kfree(a);
420 }
421 }
422}
423
424int
425tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
426{
427 int err = -EINVAL;
428
429 if (a->ops == NULL || a->ops->dump == NULL)
430 return err;
431 return a->ops->dump(skb, a, bind, ref);
432}
433
434int
435tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
436{
437 int err = -EINVAL;
438 unsigned char *b = skb_tail_pointer(skb);
439 struct nlattr *nest;
440
441 if (a->ops == NULL || a->ops->dump == NULL)
442 return err;
443
444 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
445 if (tcf_action_copy_stats(skb, a, 0))
446 goto nla_put_failure;
447 nest = nla_nest_start(skb, TCA_OPTIONS);
448 if (nest == NULL)
449 goto nla_put_failure;
450 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
451 nla_nest_end(skb, nest);
452 return err;
453 }
454
455nla_put_failure:
456 nlmsg_trim(skb, b);
457 return -1;
458}
459EXPORT_SYMBOL(tcf_action_dump_1);
460
461int
462tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
463{
464 struct tc_action *a;
465 int err = -EINVAL;
466 struct nlattr *nest;
467
468 while ((a = act) != NULL) {
469 act = a->next;
470 nest = nla_nest_start(skb, a->order);
471 if (nest == NULL)
472 goto nla_put_failure;
473 err = tcf_action_dump_1(skb, a, bind, ref);
474 if (err < 0)
475 goto errout;
476 nla_nest_end(skb, nest);
477 }
478
479 return 0;
480
481nla_put_failure:
482 err = -EINVAL;
483errout:
484 nla_nest_cancel(skb, nest);
485 return err;
486}
487
488struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
489 char *name, int ovr, int bind)
490{
491 struct tc_action *a;
492 struct tc_action_ops *a_o;
493 char act_name[IFNAMSIZ];
494 struct nlattr *tb[TCA_ACT_MAX+1];
495 struct nlattr *kind;
496 int err;
497
498 if (name == NULL) {
499 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
500 if (err < 0)
501 goto err_out;
502 err = -EINVAL;
503 kind = tb[TCA_ACT_KIND];
504 if (kind == NULL)
505 goto err_out;
506 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
507 goto err_out;
508 } else {
509 err = -EINVAL;
510 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
511 goto err_out;
512 }
513
514 a_o = tc_lookup_action_n(act_name);
515 if (a_o == NULL) {
516#ifdef CONFIG_MODULES
517 rtnl_unlock();
518 request_module("act_%s", act_name);
519 rtnl_lock();
520
521 a_o = tc_lookup_action_n(act_name);
522
523
524
525
526
527
528
529 if (a_o != NULL) {
530 err = -EAGAIN;
531 goto err_mod;
532 }
533#endif
534 err = -ENOENT;
535 goto err_out;
536 }
537
538 err = -ENOMEM;
539 a = kzalloc(sizeof(*a), GFP_KERNEL);
540 if (a == NULL)
541 goto err_mod;
542
543
544 if (name == NULL)
545 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
546 else
547 err = a_o->init(nla, est, a, ovr, bind);
548 if (err < 0)
549 goto err_free;
550
551
552
553
554
555 if (err != ACT_P_CREATED)
556 module_put(a_o->owner);
557 a->ops = a_o;
558
559 return a;
560
561err_free:
562 kfree(a);
563err_mod:
564 module_put(a_o->owner);
565err_out:
566 return ERR_PTR(err);
567}
568
569struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
570 char *name, int ovr, int bind)
571{
572 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
573 struct tc_action *head = NULL, *act, *act_prev = NULL;
574 int err;
575 int i;
576
577 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
578 if (err < 0)
579 return ERR_PTR(err);
580
581 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
582 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
583 if (IS_ERR(act))
584 goto err;
585 act->order = i;
586
587 if (head == NULL)
588 head = act;
589 else
590 act_prev->next = act;
591 act_prev = act;
592 }
593 return head;
594
595err:
596 if (head != NULL)
597 tcf_action_destroy(head, bind);
598 return act;
599}
600
601int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
602 int compat_mode)
603{
604 int err = 0;
605 struct gnet_dump d;
606 struct tcf_act_hdr *h = a->priv;
607
608 if (h == NULL)
609 goto errout;
610
611
612
613
614 if (compat_mode) {
615 if (a->type == TCA_OLD_COMPAT)
616 err = gnet_stats_start_copy_compat(skb, 0,
617 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
618 else
619 return 0;
620 } else
621 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
622 &h->tcf_lock, &d);
623
624 if (err < 0)
625 goto errout;
626
627 if (a->ops != NULL && a->ops->get_stats != NULL)
628 if (a->ops->get_stats(skb, a) < 0)
629 goto errout;
630
631 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
632 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
633 &h->tcf_rate_est) < 0 ||
634 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
635 goto errout;
636
637 if (gnet_stats_finish_copy(&d) < 0)
638 goto errout;
639
640 return 0;
641
642errout:
643 return -1;
644}
645
646static int
647tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
648 u16 flags, int event, int bind, int ref)
649{
650 struct tcamsg *t;
651 struct nlmsghdr *nlh;
652 unsigned char *b = skb_tail_pointer(skb);
653 struct nlattr *nest;
654
655 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
656
657 t = NLMSG_DATA(nlh);
658 t->tca_family = AF_UNSPEC;
659 t->tca__pad1 = 0;
660 t->tca__pad2 = 0;
661
662 nest = nla_nest_start(skb, TCA_ACT_TAB);
663 if (nest == NULL)
664 goto nla_put_failure;
665
666 if (tcf_action_dump(skb, a, bind, ref) < 0)
667 goto nla_put_failure;
668
669 nla_nest_end(skb, nest);
670
671 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
672 return skb->len;
673
674nla_put_failure:
675nlmsg_failure:
676 nlmsg_trim(skb, b);
677 return -1;
678}
679
680static int
681act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
682 struct tc_action *a, int event)
683{
684 struct sk_buff *skb;
685
686 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
687 if (!skb)
688 return -ENOBUFS;
689 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
690 kfree_skb(skb);
691 return -EINVAL;
692 }
693
694 return rtnl_unicast(skb, net, pid);
695}
696
697static struct tc_action *
698tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
699{
700 struct nlattr *tb[TCA_ACT_MAX+1];
701 struct tc_action *a;
702 int index;
703 int err;
704
705 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
706 if (err < 0)
707 goto err_out;
708
709 err = -EINVAL;
710 if (tb[TCA_ACT_INDEX] == NULL ||
711 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
712 goto err_out;
713 index = nla_get_u32(tb[TCA_ACT_INDEX]);
714
715 err = -ENOMEM;
716 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
717 if (a == NULL)
718 goto err_out;
719
720 err = -EINVAL;
721 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
722 if (a->ops == NULL)
723 goto err_free;
724 if (a->ops->lookup == NULL)
725 goto err_mod;
726 err = -ENOENT;
727 if (a->ops->lookup(a, index) == 0)
728 goto err_mod;
729
730 module_put(a->ops->owner);
731 return a;
732
733err_mod:
734 module_put(a->ops->owner);
735err_free:
736 kfree(a);
737err_out:
738 return ERR_PTR(err);
739}
740
741static void cleanup_a(struct tc_action *act)
742{
743 struct tc_action *a;
744
745 for (a = act; a; a = act) {
746 act = a->next;
747 kfree(a);
748 }
749}
750
751static struct tc_action *create_a(int i)
752{
753 struct tc_action *act;
754
755 act = kzalloc(sizeof(*act), GFP_KERNEL);
756 if (act == NULL) {
757 pr_debug("create_a: failed to alloc!\n");
758 return NULL;
759 }
760 act->order = i;
761 return act;
762}
763
764static int tca_action_flush(struct net *net, struct nlattr *nla,
765 struct nlmsghdr *n, u32 pid)
766{
767 struct sk_buff *skb;
768 unsigned char *b;
769 struct nlmsghdr *nlh;
770 struct tcamsg *t;
771 struct netlink_callback dcb;
772 struct nlattr *nest;
773 struct nlattr *tb[TCA_ACT_MAX+1];
774 struct nlattr *kind;
775 struct tc_action *a = create_a(0);
776 int err = -ENOMEM;
777
778 if (a == NULL) {
779 pr_debug("tca_action_flush: couldnt create tc_action\n");
780 return err;
781 }
782
783 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
784 if (!skb) {
785 pr_debug("tca_action_flush: failed skb alloc\n");
786 kfree(a);
787 return err;
788 }
789
790 b = skb_tail_pointer(skb);
791
792 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
793 if (err < 0)
794 goto err_out;
795
796 err = -EINVAL;
797 kind = tb[TCA_ACT_KIND];
798 a->ops = tc_lookup_action(kind);
799 if (a->ops == NULL)
800 goto err_out;
801
802 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
803 t = NLMSG_DATA(nlh);
804 t->tca_family = AF_UNSPEC;
805 t->tca__pad1 = 0;
806 t->tca__pad2 = 0;
807
808 nest = nla_nest_start(skb, TCA_ACT_TAB);
809 if (nest == NULL)
810 goto nla_put_failure;
811
812 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
813 if (err < 0)
814 goto nla_put_failure;
815 if (err == 0)
816 goto noflush_out;
817
818 nla_nest_end(skb, nest);
819
820 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
821 nlh->nlmsg_flags |= NLM_F_ROOT;
822 module_put(a->ops->owner);
823 kfree(a);
824 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
825 if (err > 0)
826 return 0;
827
828 return err;
829
830nla_put_failure:
831nlmsg_failure:
832 module_put(a->ops->owner);
833err_out:
834noflush_out:
835 kfree_skb(skb);
836 kfree(a);
837 return err;
838}
839
840static int
841tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
842 u32 pid, int event)
843{
844 int i, ret;
845 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
846 struct tc_action *head = NULL, *act, *act_prev = NULL;
847
848 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
849 if (ret < 0)
850 return ret;
851
852 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
853 if (tb[1] != NULL)
854 return tca_action_flush(net, tb[1], n, pid);
855 else
856 return -EINVAL;
857 }
858
859 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
860 act = tcf_action_get_1(tb[i], n, pid);
861 if (IS_ERR(act)) {
862 ret = PTR_ERR(act);
863 goto err;
864 }
865 act->order = i;
866
867 if (head == NULL)
868 head = act;
869 else
870 act_prev->next = act;
871 act_prev = act;
872 }
873
874 if (event == RTM_GETACTION)
875 ret = act_get_notify(net, pid, n, head, event);
876 else {
877 struct sk_buff *skb;
878
879 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
880 if (!skb) {
881 ret = -ENOBUFS;
882 goto err;
883 }
884
885 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
886 0, 1) <= 0) {
887 kfree_skb(skb);
888 ret = -EINVAL;
889 goto err;
890 }
891
892
893 tcf_action_destroy(head, 0);
894 ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
895 n->nlmsg_flags&NLM_F_ECHO);
896 if (ret > 0)
897 return 0;
898 return ret;
899 }
900err:
901 cleanup_a(head);
902 return ret;
903}
904
905static int tcf_add_notify(struct net *net, struct tc_action *a,
906 u32 pid, u32 seq, int event, u16 flags)
907{
908 struct tcamsg *t;
909 struct nlmsghdr *nlh;
910 struct sk_buff *skb;
911 struct nlattr *nest;
912 unsigned char *b;
913 int err = 0;
914
915 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
916 if (!skb)
917 return -ENOBUFS;
918
919 b = skb_tail_pointer(skb);
920
921 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
922 t = NLMSG_DATA(nlh);
923 t->tca_family = AF_UNSPEC;
924 t->tca__pad1 = 0;
925 t->tca__pad2 = 0;
926
927 nest = nla_nest_start(skb, TCA_ACT_TAB);
928 if (nest == NULL)
929 goto nla_put_failure;
930
931 if (tcf_action_dump(skb, a, 0, 0) < 0)
932 goto nla_put_failure;
933
934 nla_nest_end(skb, nest);
935
936 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
937 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
938
939 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
940 if (err > 0)
941 err = 0;
942 return err;
943
944nla_put_failure:
945nlmsg_failure:
946 kfree_skb(skb);
947 return -1;
948}
949
950
951static int
952tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
953 u32 pid, int ovr)
954{
955 int ret = 0;
956 struct tc_action *act;
957 struct tc_action *a;
958 u32 seq = n->nlmsg_seq;
959
960 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
961 if (act == NULL)
962 goto done;
963 if (IS_ERR(act)) {
964 ret = PTR_ERR(act);
965 goto done;
966 }
967
968
969
970
971 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
972 for (a = act; a; a = act) {
973 act = a->next;
974 kfree(a);
975 }
976done:
977 return ret;
978}
979
980static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
981{
982 struct net *net = sock_net(skb->sk);
983 struct nlattr *tca[TCA_ACT_MAX + 1];
984 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
985 int ret = 0, ovr = 0;
986
987 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
988 if (ret < 0)
989 return ret;
990
991 if (tca[TCA_ACT_TAB] == NULL) {
992 pr_notice("tc_ctl_action: received NO action attribs\n");
993 return -EINVAL;
994 }
995
996
997
998 switch (n->nlmsg_type) {
999 case RTM_NEWACTION:
1000
1001
1002
1003
1004
1005
1006 if (n->nlmsg_flags&NLM_F_REPLACE)
1007 ovr = 1;
1008replay:
1009 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
1010 if (ret == -EAGAIN)
1011 goto replay;
1012 break;
1013 case RTM_DELACTION:
1014 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1015 pid, RTM_DELACTION);
1016 break;
1017 case RTM_GETACTION:
1018 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1019 pid, RTM_GETACTION);
1020 break;
1021 default:
1022 BUG();
1023 }
1024
1025 return ret;
1026}
1027
1028static struct nlattr *
1029find_dump_kind(const struct nlmsghdr *n)
1030{
1031 struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
1032 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1033 struct nlattr *nla[TCAA_MAX + 1];
1034 struct nlattr *kind;
1035
1036 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1037 return NULL;
1038 tb1 = nla[TCA_ACT_TAB];
1039 if (tb1 == NULL)
1040 return NULL;
1041
1042 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1043 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1044 return NULL;
1045
1046 if (tb[1] == NULL)
1047 return NULL;
1048 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1049 nla_len(tb[1]), NULL) < 0)
1050 return NULL;
1051 kind = tb2[TCA_ACT_KIND];
1052
1053 return kind;
1054}
1055
1056static int
1057tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1058{
1059 struct nlmsghdr *nlh;
1060 unsigned char *b = skb_tail_pointer(skb);
1061 struct nlattr *nest;
1062 struct tc_action_ops *a_o;
1063 struct tc_action a;
1064 int ret = 0;
1065 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1066 struct nlattr *kind = find_dump_kind(cb->nlh);
1067
1068 if (kind == NULL) {
1069 pr_info("tc_dump_action: action bad kind\n");
1070 return 0;
1071 }
1072
1073 a_o = tc_lookup_action(kind);
1074 if (a_o == NULL) {
1075 return 0;
1076 }
1077
1078 memset(&a, 0, sizeof(struct tc_action));
1079 a.ops = a_o;
1080
1081 if (a_o->walk == NULL) {
1082 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1083 a_o->kind);
1084 goto nla_put_failure;
1085 }
1086
1087 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1088 cb->nlh->nlmsg_type, sizeof(*t));
1089 t = NLMSG_DATA(nlh);
1090 t->tca_family = AF_UNSPEC;
1091 t->tca__pad1 = 0;
1092 t->tca__pad2 = 0;
1093
1094 nest = nla_nest_start(skb, TCA_ACT_TAB);
1095 if (nest == NULL)
1096 goto nla_put_failure;
1097
1098 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1099 if (ret < 0)
1100 goto nla_put_failure;
1101
1102 if (ret > 0) {
1103 nla_nest_end(skb, nest);
1104 ret = skb->len;
1105 } else
1106 nla_nest_cancel(skb, nest);
1107
1108 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1109 if (NETLINK_CB(cb->skb).pid && ret)
1110 nlh->nlmsg_flags |= NLM_F_MULTI;
1111 module_put(a_o->owner);
1112 return skb->len;
1113
1114nla_put_failure:
1115nlmsg_failure:
1116 module_put(a_o->owner);
1117 nlmsg_trim(skb, b);
1118 return skb->len;
1119}
1120
1121static int __init tc_action_init(void)
1122{
1123 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1124 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1125 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
1126
1127 return 0;
1128}
1129
1130subsys_initcall(tc_action_init);
1131