PCI: use dev_printk in quirk messages
[pv_ops_mirror.git] / net / sched / act_api.c
blob0b8eb235bc136fff1eeb349f72c549a5ce4df3df
1 /*
2 * net/sched/act_api.c Packet action API.
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.
9 * Author: Jamal Hadi Salim
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>
28 void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
30 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
31 struct tcf_common **p1p;
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;
44 BUG_TRAP(0);
46 EXPORT_SYMBOL(tcf_hash_destroy);
48 int tcf_hash_release(struct tcf_common *p, int bind,
49 struct tcf_hashinfo *hinfo)
51 int ret = 0;
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
57 p->tcfc_refcnt--;
58 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
59 tcf_hash_destroy(p, hinfo);
60 ret = 1;
63 return ret;
65 EXPORT_SYMBOL(tcf_hash_release);
67 static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
68 struct tc_action *a, struct tcf_hashinfo *hinfo)
70 struct tcf_common *p;
71 int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
72 struct nlattr *nest;
74 read_lock_bh(hinfo->lock);
76 s_i = cb->args[0];
78 for (i = 0; i < (hinfo->hmask + 1); i++) {
79 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
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;
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;
97 nla_nest_end(skb, nest);
98 n_i++;
99 if (n_i >= TCA_ACT_MAX_PRIO)
100 goto done;
103 done:
104 read_unlock_bh(hinfo->lock);
105 if (n_i)
106 cb->args[0] += n_i;
107 return n_i;
109 nla_put_failure:
110 nla_nest_cancel(skb, nest);
111 goto done;
114 static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
115 struct tcf_hashinfo *hinfo)
117 struct tcf_common *p, *s_p;
118 struct nlattr *nest;
119 int i= 0, n_i = 0;
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)];
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;
136 NLA_PUT_U32(skb, TCA_FCNT, n_i);
137 nla_nest_end(skb, nest);
139 return n_i;
140 nla_put_failure:
141 nla_nest_cancel(skb, nest);
142 return -EINVAL;
145 int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
146 int type, struct tc_action *a)
148 struct tcf_hashinfo *hinfo = a->ops->hinfo;
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;
159 EXPORT_SYMBOL(tcf_generic_walker);
161 struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
163 struct tcf_common *p;
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;
171 read_unlock_bh(hinfo->lock);
173 return p;
175 EXPORT_SYMBOL(tcf_hash_lookup);
177 u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
179 u32 val = *idx_gen;
181 do {
182 if (++val == 0)
183 val = 1;
184 } while (tcf_hash_lookup(val, hinfo));
186 return (*idx_gen = val);
188 EXPORT_SYMBOL(tcf_hash_new_index);
190 int tcf_hash_search(struct tc_action *a, u32 index)
192 struct tcf_hashinfo *hinfo = a->ops->hinfo;
193 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
195 if (p) {
196 a->priv = p;
197 return 1;
199 return 0;
201 EXPORT_SYMBOL(tcf_hash_search);
203 struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
204 struct tcf_hashinfo *hinfo)
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++;
212 a->priv = p;
214 return p;
216 EXPORT_SYMBOL(tcf_hash_check);
218 struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo)
220 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
222 if (unlikely(!p))
223 return p;
224 p->tcfc_refcnt = 1;
225 if (bind)
226 p->tcfc_bindcnt = 1;
228 spin_lock_init(&p->tcfc_lock);
229 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
230 p->tcfc_tm.install = jiffies;
231 p->tcfc_tm.lastuse = jiffies;
232 if (est)
233 gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
234 &p->tcfc_lock, est);
235 a->priv = (void *) p;
236 return p;
238 EXPORT_SYMBOL(tcf_hash_create);
240 void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
242 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
244 write_lock_bh(hinfo->lock);
245 p->tcfc_next = hinfo->htab[h];
246 hinfo->htab[h] = p;
247 write_unlock_bh(hinfo->lock);
249 EXPORT_SYMBOL(tcf_hash_insert);
251 static struct tc_action_ops *act_base = NULL;
252 static DEFINE_RWLOCK(act_mod_lock);
254 int tcf_register_action(struct tc_action_ops *act)
256 struct tc_action_ops *a, **ap;
258 write_lock(&act_mod_lock);
259 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
260 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
261 write_unlock(&act_mod_lock);
262 return -EEXIST;
265 act->next = NULL;
266 *ap = act;
267 write_unlock(&act_mod_lock);
268 return 0;
270 EXPORT_SYMBOL(tcf_register_action);
272 int tcf_unregister_action(struct tc_action_ops *act)
274 struct tc_action_ops *a, **ap;
275 int err = -ENOENT;
277 write_lock(&act_mod_lock);
278 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
279 if (a == act)
280 break;
281 if (a) {
282 *ap = a->next;
283 a->next = NULL;
284 err = 0;
286 write_unlock(&act_mod_lock);
287 return err;
289 EXPORT_SYMBOL(tcf_unregister_action);
291 /* lookup by name */
292 static struct tc_action_ops *tc_lookup_action_n(char *kind)
294 struct tc_action_ops *a = NULL;
296 if (kind) {
297 read_lock(&act_mod_lock);
298 for (a = act_base; a; a = a->next) {
299 if (strcmp(kind, a->kind) == 0) {
300 if (!try_module_get(a->owner)) {
301 read_unlock(&act_mod_lock);
302 return NULL;
304 break;
307 read_unlock(&act_mod_lock);
309 return a;
312 /* lookup by nlattr */
313 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
315 struct tc_action_ops *a = NULL;
317 if (kind) {
318 read_lock(&act_mod_lock);
319 for (a = act_base; a; a = a->next) {
320 if (nla_strcmp(kind, a->kind) == 0) {
321 if (!try_module_get(a->owner)) {
322 read_unlock(&act_mod_lock);
323 return NULL;
325 break;
328 read_unlock(&act_mod_lock);
330 return a;
333 #if 0
334 /* lookup by id */
335 static struct tc_action_ops *tc_lookup_action_id(u32 type)
337 struct tc_action_ops *a = NULL;
339 if (type) {
340 read_lock(&act_mod_lock);
341 for (a = act_base; a; a = a->next) {
342 if (a->type == type) {
343 if (!try_module_get(a->owner)) {
344 read_unlock(&act_mod_lock);
345 return NULL;
347 break;
350 read_unlock(&act_mod_lock);
352 return a;
354 #endif
356 int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
357 struct tcf_result *res)
359 struct tc_action *a;
360 int ret = -1;
362 if (skb->tc_verd & TC_NCLS) {
363 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
364 ret = TC_ACT_OK;
365 goto exec_done;
367 while ((a = act) != NULL) {
368 repeat:
369 if (a->ops && a->ops->act) {
370 ret = a->ops->act(skb, a, res);
371 if (TC_MUNGED & skb->tc_verd) {
372 /* copied already, allow trampling */
373 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
374 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
376 if (ret == TC_ACT_REPEAT)
377 goto repeat; /* we need a ttl - JHS */
378 if (ret != TC_ACT_PIPE)
379 goto exec_done;
381 act = a->next;
383 exec_done:
384 return ret;
386 EXPORT_SYMBOL(tcf_action_exec);
388 void tcf_action_destroy(struct tc_action *act, int bind)
390 struct tc_action *a;
392 for (a = act; a; a = act) {
393 if (a->ops && a->ops->cleanup) {
394 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
395 module_put(a->ops->owner);
396 act = act->next;
397 kfree(a);
398 } else { /*FIXME: Remove later - catch insertion bugs*/
399 printk("tcf_action_destroy: BUG? destroying NULL ops\n");
400 act = act->next;
401 kfree(a);
407 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
409 int err = -EINVAL;
411 if (a->ops == NULL || a->ops->dump == NULL)
412 return err;
413 return a->ops->dump(skb, a, bind, ref);
417 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
419 int err = -EINVAL;
420 unsigned char *b = skb_tail_pointer(skb);
421 struct nlattr *nest;
423 if (a->ops == NULL || a->ops->dump == NULL)
424 return err;
426 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
427 if (tcf_action_copy_stats(skb, a, 0))
428 goto nla_put_failure;
429 nest = nla_nest_start(skb, TCA_OPTIONS);
430 if (nest == NULL)
431 goto nla_put_failure;
432 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
433 nla_nest_end(skb, nest);
434 return err;
437 nla_put_failure:
438 nlmsg_trim(skb, b);
439 return -1;
441 EXPORT_SYMBOL(tcf_action_dump_1);
444 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
446 struct tc_action *a;
447 int err = -EINVAL;
448 struct nlattr *nest;
450 while ((a = act) != NULL) {
451 act = a->next;
452 nest = nla_nest_start(skb, a->order);
453 if (nest == NULL)
454 goto nla_put_failure;
455 err = tcf_action_dump_1(skb, a, bind, ref);
456 if (err < 0)
457 goto errout;
458 nla_nest_end(skb, nest);
461 return 0;
463 nla_put_failure:
464 err = -EINVAL;
465 errout:
466 nla_nest_cancel(skb, nest);
467 return err;
470 struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
471 char *name, int ovr, int bind)
473 struct tc_action *a;
474 struct tc_action_ops *a_o;
475 char act_name[IFNAMSIZ];
476 struct nlattr *tb[TCA_ACT_MAX+1];
477 struct nlattr *kind;
478 int err;
480 if (name == NULL) {
481 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
482 if (err < 0)
483 goto err_out;
484 err = -EINVAL;
485 kind = tb[TCA_ACT_KIND];
486 if (kind == NULL)
487 goto err_out;
488 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
489 goto err_out;
490 } else {
491 err = -EINVAL;
492 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
493 goto err_out;
496 a_o = tc_lookup_action_n(act_name);
497 if (a_o == NULL) {
498 #ifdef CONFIG_KMOD
499 rtnl_unlock();
500 request_module("act_%s", act_name);
501 rtnl_lock();
503 a_o = tc_lookup_action_n(act_name);
505 /* We dropped the RTNL semaphore in order to
506 * perform the module load. So, even if we
507 * succeeded in loading the module we have to
508 * tell the caller to replay the request. We
509 * indicate this using -EAGAIN.
511 if (a_o != NULL) {
512 err = -EAGAIN;
513 goto err_mod;
515 #endif
516 err = -ENOENT;
517 goto err_out;
520 err = -ENOMEM;
521 a = kzalloc(sizeof(*a), GFP_KERNEL);
522 if (a == NULL)
523 goto err_mod;
525 /* backward compatibility for policer */
526 if (name == NULL)
527 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
528 else
529 err = a_o->init(nla, est, a, ovr, bind);
530 if (err < 0)
531 goto err_free;
533 /* module count goes up only when brand new policy is created
534 if it exists and is only bound to in a_o->init() then
535 ACT_P_CREATED is not returned (a zero is).
537 if (err != ACT_P_CREATED)
538 module_put(a_o->owner);
539 a->ops = a_o;
541 return a;
543 err_free:
544 kfree(a);
545 err_mod:
546 module_put(a_o->owner);
547 err_out:
548 return ERR_PTR(err);
551 struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
552 char *name, int ovr, int bind)
554 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
555 struct tc_action *head = NULL, *act, *act_prev = NULL;
556 int err;
557 int i;
559 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
560 if (err < 0)
561 return ERR_PTR(err);
563 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
564 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
565 if (IS_ERR(act))
566 goto err;
567 act->order = i;
569 if (head == NULL)
570 head = act;
571 else
572 act_prev->next = act;
573 act_prev = act;
575 return head;
577 err:
578 if (head != NULL)
579 tcf_action_destroy(head, bind);
580 return act;
583 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
584 int compat_mode)
586 int err = 0;
587 struct gnet_dump d;
588 struct tcf_act_hdr *h = a->priv;
590 if (h == NULL)
591 goto errout;
593 /* compat_mode being true specifies a call that is supposed
594 * to add additional backward compatiblity statistic TLVs.
596 if (compat_mode) {
597 if (a->type == TCA_OLD_COMPAT)
598 err = gnet_stats_start_copy_compat(skb, 0,
599 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
600 else
601 return 0;
602 } else
603 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
604 &h->tcf_lock, &d);
606 if (err < 0)
607 goto errout;
609 if (a->ops != NULL && a->ops->get_stats != NULL)
610 if (a->ops->get_stats(skb, a) < 0)
611 goto errout;
613 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
614 gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
615 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
616 goto errout;
618 if (gnet_stats_finish_copy(&d) < 0)
619 goto errout;
621 return 0;
623 errout:
624 return -1;
627 static int
628 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
629 u16 flags, int event, int bind, int ref)
631 struct tcamsg *t;
632 struct nlmsghdr *nlh;
633 unsigned char *b = skb_tail_pointer(skb);
634 struct nlattr *nest;
636 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
638 t = NLMSG_DATA(nlh);
639 t->tca_family = AF_UNSPEC;
640 t->tca__pad1 = 0;
641 t->tca__pad2 = 0;
643 nest = nla_nest_start(skb, TCA_ACT_TAB);
644 if (nest == NULL)
645 goto nla_put_failure;
647 if (tcf_action_dump(skb, a, bind, ref) < 0)
648 goto nla_put_failure;
650 nla_nest_end(skb, nest);
652 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
653 return skb->len;
655 nla_put_failure:
656 nlmsg_failure:
657 nlmsg_trim(skb, b);
658 return -1;
661 static int
662 act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
664 struct sk_buff *skb;
666 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
667 if (!skb)
668 return -ENOBUFS;
669 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
670 kfree_skb(skb);
671 return -EINVAL;
674 return rtnl_unicast(skb, &init_net, pid);
677 static struct tc_action *
678 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
680 struct nlattr *tb[TCA_ACT_MAX+1];
681 struct tc_action *a;
682 int index;
683 int err;
685 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
686 if (err < 0)
687 goto err_out;
689 err = -EINVAL;
690 if (tb[TCA_ACT_INDEX] == NULL ||
691 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
692 goto err_out;
693 index = nla_get_u32(tb[TCA_ACT_INDEX]);
695 err = -ENOMEM;
696 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
697 if (a == NULL)
698 goto err_out;
700 err = -EINVAL;
701 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
702 if (a->ops == NULL)
703 goto err_free;
704 if (a->ops->lookup == NULL)
705 goto err_mod;
706 err = -ENOENT;
707 if (a->ops->lookup(a, index) == 0)
708 goto err_mod;
710 module_put(a->ops->owner);
711 return a;
713 err_mod:
714 module_put(a->ops->owner);
715 err_free:
716 kfree(a);
717 err_out:
718 return ERR_PTR(err);
721 static void cleanup_a(struct tc_action *act)
723 struct tc_action *a;
725 for (a = act; a; a = act) {
726 act = a->next;
727 kfree(a);
731 static struct tc_action *create_a(int i)
733 struct tc_action *act;
735 act = kzalloc(sizeof(*act), GFP_KERNEL);
736 if (act == NULL) {
737 printk("create_a: failed to alloc!\n");
738 return NULL;
740 act->order = i;
741 return act;
744 static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
746 struct sk_buff *skb;
747 unsigned char *b;
748 struct nlmsghdr *nlh;
749 struct tcamsg *t;
750 struct netlink_callback dcb;
751 struct nlattr *nest;
752 struct nlattr *tb[TCA_ACT_MAX+1];
753 struct nlattr *kind;
754 struct tc_action *a = create_a(0);
755 int err = -EINVAL;
757 if (a == NULL) {
758 printk("tca_action_flush: couldnt create tc_action\n");
759 return err;
762 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
763 if (!skb) {
764 printk("tca_action_flush: failed skb alloc\n");
765 kfree(a);
766 return -ENOBUFS;
769 b = skb_tail_pointer(skb);
771 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
772 if (err < 0)
773 goto err_out;
775 err = -EINVAL;
776 kind = tb[TCA_ACT_KIND];
777 a->ops = tc_lookup_action(kind);
778 if (a->ops == NULL)
779 goto err_out;
781 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
782 t = NLMSG_DATA(nlh);
783 t->tca_family = AF_UNSPEC;
784 t->tca__pad1 = 0;
785 t->tca__pad2 = 0;
787 nest = nla_nest_start(skb, TCA_ACT_TAB);
788 if (nest == NULL)
789 goto nla_put_failure;
791 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
792 if (err < 0)
793 goto nla_put_failure;
795 nla_nest_end(skb, nest);
797 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
798 nlh->nlmsg_flags |= NLM_F_ROOT;
799 module_put(a->ops->owner);
800 kfree(a);
801 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
802 if (err > 0)
803 return 0;
805 return err;
807 nla_put_failure:
808 nlmsg_failure:
809 module_put(a->ops->owner);
810 err_out:
811 kfree_skb(skb);
812 kfree(a);
813 return err;
816 static int
817 tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
819 int i, ret;
820 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
821 struct tc_action *head = NULL, *act, *act_prev = NULL;
823 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
824 if (ret < 0)
825 return ret;
827 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
828 if (tb[0] != NULL && tb[1] == NULL)
829 return tca_action_flush(tb[0], n, pid);
832 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
833 act = tcf_action_get_1(tb[i], n, pid);
834 if (IS_ERR(act)) {
835 ret = PTR_ERR(act);
836 goto err;
838 act->order = i;
840 if (head == NULL)
841 head = act;
842 else
843 act_prev->next = act;
844 act_prev = act;
847 if (event == RTM_GETACTION)
848 ret = act_get_notify(pid, n, head, event);
849 else { /* delete */
850 struct sk_buff *skb;
852 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
853 if (!skb) {
854 ret = -ENOBUFS;
855 goto err;
858 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
859 0, 1) <= 0) {
860 kfree_skb(skb);
861 ret = -EINVAL;
862 goto err;
865 /* now do the delete */
866 tcf_action_destroy(head, 0);
867 ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
868 n->nlmsg_flags&NLM_F_ECHO);
869 if (ret > 0)
870 return 0;
871 return ret;
873 err:
874 cleanup_a(head);
875 return ret;
878 static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
879 u16 flags)
881 struct tcamsg *t;
882 struct nlmsghdr *nlh;
883 struct sk_buff *skb;
884 struct nlattr *nest;
885 unsigned char *b;
886 int err = 0;
888 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
889 if (!skb)
890 return -ENOBUFS;
892 b = skb_tail_pointer(skb);
894 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
895 t = NLMSG_DATA(nlh);
896 t->tca_family = AF_UNSPEC;
897 t->tca__pad1 = 0;
898 t->tca__pad2 = 0;
900 nest = nla_nest_start(skb, TCA_ACT_TAB);
901 if (nest == NULL)
902 goto nla_put_failure;
904 if (tcf_action_dump(skb, a, 0, 0) < 0)
905 goto nla_put_failure;
907 nla_nest_end(skb, nest);
909 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
910 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
912 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
913 if (err > 0)
914 err = 0;
915 return err;
917 nla_put_failure:
918 nlmsg_failure:
919 kfree_skb(skb);
920 return -1;
924 static int
925 tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
927 int ret = 0;
928 struct tc_action *act;
929 struct tc_action *a;
930 u32 seq = n->nlmsg_seq;
932 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
933 if (act == NULL)
934 goto done;
935 if (IS_ERR(act)) {
936 ret = PTR_ERR(act);
937 goto done;
940 /* dump then free all the actions after update; inserted policy
941 * stays intact
942 * */
943 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
944 for (a = act; a; a = act) {
945 act = a->next;
946 kfree(a);
948 done:
949 return ret;
952 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
954 struct net *net = skb->sk->sk_net;
955 struct nlattr *tca[TCA_ACT_MAX + 1];
956 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
957 int ret = 0, ovr = 0;
959 if (net != &init_net)
960 return -EINVAL;
962 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
963 if (ret < 0)
964 return ret;
966 if (tca[TCA_ACT_TAB] == NULL) {
967 printk("tc_ctl_action: received NO action attribs\n");
968 return -EINVAL;
971 /* n->nlmsg_flags&NLM_F_CREATE
972 * */
973 switch (n->nlmsg_type) {
974 case RTM_NEWACTION:
975 /* we are going to assume all other flags
976 * imply create only if it doesnt exist
977 * Note that CREATE | EXCL implies that
978 * but since we want avoid ambiguity (eg when flags
979 * is zero) then just set this
981 if (n->nlmsg_flags&NLM_F_REPLACE)
982 ovr = 1;
983 replay:
984 ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr);
985 if (ret == -EAGAIN)
986 goto replay;
987 break;
988 case RTM_DELACTION:
989 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION);
990 break;
991 case RTM_GETACTION:
992 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION);
993 break;
994 default:
995 BUG();
998 return ret;
1001 static struct nlattr *
1002 find_dump_kind(struct nlmsghdr *n)
1004 struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
1005 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1006 struct nlattr *nla[TCAA_MAX + 1];
1007 struct nlattr *kind;
1009 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1010 return NULL;
1011 tb1 = nla[TCA_ACT_TAB];
1012 if (tb1 == NULL)
1013 return NULL;
1015 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1016 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1017 return NULL;
1019 if (tb[1] == NULL)
1020 return NULL;
1021 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1022 nla_len(tb[1]), NULL) < 0)
1023 return NULL;
1024 kind = tb2[TCA_ACT_KIND];
1026 return kind;
1029 static int
1030 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1032 struct net *net = skb->sk->sk_net;
1033 struct nlmsghdr *nlh;
1034 unsigned char *b = skb_tail_pointer(skb);
1035 struct nlattr *nest;
1036 struct tc_action_ops *a_o;
1037 struct tc_action a;
1038 int ret = 0;
1039 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1040 struct nlattr *kind = find_dump_kind(cb->nlh);
1042 if (net != &init_net)
1043 return 0;
1045 if (kind == NULL) {
1046 printk("tc_dump_action: action bad kind\n");
1047 return 0;
1050 a_o = tc_lookup_action(kind);
1051 if (a_o == NULL) {
1052 return 0;
1055 memset(&a, 0, sizeof(struct tc_action));
1056 a.ops = a_o;
1058 if (a_o->walk == NULL) {
1059 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
1060 goto nla_put_failure;
1063 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1064 cb->nlh->nlmsg_type, sizeof(*t));
1065 t = NLMSG_DATA(nlh);
1066 t->tca_family = AF_UNSPEC;
1067 t->tca__pad1 = 0;
1068 t->tca__pad2 = 0;
1070 nest = nla_nest_start(skb, TCA_ACT_TAB);
1071 if (nest == NULL)
1072 goto nla_put_failure;
1074 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1075 if (ret < 0)
1076 goto nla_put_failure;
1078 if (ret > 0) {
1079 nla_nest_end(skb, nest);
1080 ret = skb->len;
1081 } else
1082 nla_nest_cancel(skb, nest);
1084 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1085 if (NETLINK_CB(cb->skb).pid && ret)
1086 nlh->nlmsg_flags |= NLM_F_MULTI;
1087 module_put(a_o->owner);
1088 return skb->len;
1090 nla_put_failure:
1091 nlmsg_failure:
1092 module_put(a_o->owner);
1093 nlmsg_trim(skb, b);
1094 return skb->len;
1097 static int __init tc_action_init(void)
1099 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1100 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1101 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
1103 return 0;
1106 subsys_initcall(tc_action_init);