Linux 4.1.16
[linux/fpc-iii.git] / net / sched / act_api.c
blobf8d9c2a2c451d68c8a2d22555c1571d14c5c6293
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/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/init.h>
21 #include <linux/kmod.h>
22 #include <linux/err.h>
23 #include <linux/module.h>
24 #include <net/net_namespace.h>
25 #include <net/sock.h>
26 #include <net/sch_generic.h>
27 #include <net/act_api.h>
28 #include <net/netlink.h>
30 void tcf_hash_destroy(struct tc_action *a)
32 struct tcf_common *p = a->priv;
33 struct tcf_hashinfo *hinfo = a->ops->hinfo;
35 spin_lock_bh(&hinfo->lock);
36 hlist_del(&p->tcfc_head);
37 spin_unlock_bh(&hinfo->lock);
38 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
41 * gen_estimator est_timer() might access p->tcfc_lock
42 * or bstats, wait a RCU grace period before freeing p
44 kfree_rcu(p, tcfc_rcu);
46 EXPORT_SYMBOL(tcf_hash_destroy);
48 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict)
50 struct tcf_common *p = a->priv;
51 int ret = 0;
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
56 else if (strict && p->tcfc_bindcnt > 0)
57 return -EPERM;
59 p->tcfc_refcnt--;
60 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
61 if (a->ops->cleanup)
62 a->ops->cleanup(a, bind);
63 tcf_hash_destroy(a);
64 ret = 1;
68 return ret;
70 EXPORT_SYMBOL(__tcf_hash_release);
72 static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
73 struct tc_action *a)
75 struct tcf_hashinfo *hinfo = a->ops->hinfo;
76 struct hlist_head *head;
77 struct tcf_common *p;
78 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
79 struct nlattr *nest;
81 spin_lock_bh(&hinfo->lock);
83 s_i = cb->args[0];
85 for (i = 0; i < (hinfo->hmask + 1); i++) {
86 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
88 hlist_for_each_entry_rcu(p, head, tcfc_head) {
89 index++;
90 if (index < s_i)
91 continue;
92 a->priv = p;
93 a->order = n_i;
95 nest = nla_nest_start(skb, a->order);
96 if (nest == NULL)
97 goto nla_put_failure;
98 err = tcf_action_dump_1(skb, a, 0, 0);
99 if (err < 0) {
100 index--;
101 nlmsg_trim(skb, nest);
102 goto done;
104 nla_nest_end(skb, nest);
105 n_i++;
106 if (n_i >= TCA_ACT_MAX_PRIO)
107 goto done;
110 done:
111 spin_unlock_bh(&hinfo->lock);
112 if (n_i)
113 cb->args[0] += n_i;
114 return n_i;
116 nla_put_failure:
117 nla_nest_cancel(skb, nest);
118 goto done;
121 static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a)
123 struct tcf_hashinfo *hinfo = a->ops->hinfo;
124 struct hlist_head *head;
125 struct hlist_node *n;
126 struct tcf_common *p;
127 struct nlattr *nest;
128 int i = 0, n_i = 0;
129 int ret = -EINVAL;
131 nest = nla_nest_start(skb, a->order);
132 if (nest == NULL)
133 goto nla_put_failure;
134 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
135 goto nla_put_failure;
136 for (i = 0; i < (hinfo->hmask + 1); i++) {
137 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
138 hlist_for_each_entry_safe(p, n, head, tcfc_head) {
139 a->priv = p;
140 ret = __tcf_hash_release(a, false, true);
141 if (ret == ACT_P_DELETED) {
142 module_put(a->ops->owner);
143 n_i++;
144 } else if (ret < 0)
145 goto nla_put_failure;
148 if (nla_put_u32(skb, TCA_FCNT, n_i))
149 goto nla_put_failure;
150 nla_nest_end(skb, nest);
152 return n_i;
153 nla_put_failure:
154 nla_nest_cancel(skb, nest);
155 return ret;
158 static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
159 int type, struct tc_action *a)
161 if (type == RTM_DELACTION) {
162 return tcf_del_walker(skb, a);
163 } else if (type == RTM_GETACTION) {
164 return tcf_dump_walker(skb, cb, a);
165 } else {
166 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
167 return -EINVAL;
171 static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
173 struct tcf_common *p = NULL;
174 struct hlist_head *head;
176 spin_lock_bh(&hinfo->lock);
177 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
178 hlist_for_each_entry_rcu(p, head, tcfc_head)
179 if (p->tcfc_index == index)
180 break;
181 spin_unlock_bh(&hinfo->lock);
183 return p;
186 u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo)
188 u32 val = hinfo->index;
190 do {
191 if (++val == 0)
192 val = 1;
193 } while (tcf_hash_lookup(val, hinfo));
195 hinfo->index = val;
196 return val;
198 EXPORT_SYMBOL(tcf_hash_new_index);
200 int tcf_hash_search(struct tc_action *a, u32 index)
202 struct tcf_hashinfo *hinfo = a->ops->hinfo;
203 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
205 if (p) {
206 a->priv = p;
207 return 1;
209 return 0;
211 EXPORT_SYMBOL(tcf_hash_search);
213 int tcf_hash_check(u32 index, struct tc_action *a, int bind)
215 struct tcf_hashinfo *hinfo = a->ops->hinfo;
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 return 1;
224 return 0;
226 EXPORT_SYMBOL(tcf_hash_check);
228 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
230 struct tcf_common *pc = a->priv;
231 if (est)
232 gen_kill_estimator(&pc->tcfc_bstats,
233 &pc->tcfc_rate_est);
234 kfree_rcu(pc, tcfc_rcu);
236 EXPORT_SYMBOL(tcf_hash_cleanup);
238 int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
239 int size, int bind)
241 struct tcf_hashinfo *hinfo = a->ops->hinfo;
242 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
244 if (unlikely(!p))
245 return -ENOMEM;
246 p->tcfc_refcnt = 1;
247 if (bind)
248 p->tcfc_bindcnt = 1;
250 spin_lock_init(&p->tcfc_lock);
251 INIT_HLIST_NODE(&p->tcfc_head);
252 p->tcfc_index = index ? index : tcf_hash_new_index(hinfo);
253 p->tcfc_tm.install = jiffies;
254 p->tcfc_tm.lastuse = jiffies;
255 if (est) {
256 int err = gen_new_estimator(&p->tcfc_bstats, NULL,
257 &p->tcfc_rate_est,
258 &p->tcfc_lock, est);
259 if (err) {
260 kfree(p);
261 return err;
265 a->priv = (void *) p;
266 return 0;
268 EXPORT_SYMBOL(tcf_hash_create);
270 void tcf_hash_insert(struct tc_action *a)
272 struct tcf_common *p = a->priv;
273 struct tcf_hashinfo *hinfo = a->ops->hinfo;
274 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
276 spin_lock_bh(&hinfo->lock);
277 hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
278 spin_unlock_bh(&hinfo->lock);
280 EXPORT_SYMBOL(tcf_hash_insert);
282 static LIST_HEAD(act_base);
283 static DEFINE_RWLOCK(act_mod_lock);
285 int tcf_register_action(struct tc_action_ops *act, unsigned int mask)
287 struct tc_action_ops *a;
288 int err;
290 /* Must supply act, dump and init */
291 if (!act->act || !act->dump || !act->init)
292 return -EINVAL;
294 /* Supply defaults */
295 if (!act->lookup)
296 act->lookup = tcf_hash_search;
297 if (!act->walk)
298 act->walk = tcf_generic_walker;
300 act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL);
301 if (!act->hinfo)
302 return -ENOMEM;
303 err = tcf_hashinfo_init(act->hinfo, mask);
304 if (err) {
305 kfree(act->hinfo);
306 return err;
309 write_lock(&act_mod_lock);
310 list_for_each_entry(a, &act_base, head) {
311 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
312 write_unlock(&act_mod_lock);
313 tcf_hashinfo_destroy(act->hinfo);
314 kfree(act->hinfo);
315 return -EEXIST;
318 list_add_tail(&act->head, &act_base);
319 write_unlock(&act_mod_lock);
320 return 0;
322 EXPORT_SYMBOL(tcf_register_action);
324 int tcf_unregister_action(struct tc_action_ops *act)
326 struct tc_action_ops *a;
327 int err = -ENOENT;
329 write_lock(&act_mod_lock);
330 list_for_each_entry(a, &act_base, head) {
331 if (a == act) {
332 list_del(&act->head);
333 tcf_hashinfo_destroy(act->hinfo);
334 kfree(act->hinfo);
335 err = 0;
336 break;
339 write_unlock(&act_mod_lock);
340 return err;
342 EXPORT_SYMBOL(tcf_unregister_action);
344 /* lookup by name */
345 static struct tc_action_ops *tc_lookup_action_n(char *kind)
347 struct tc_action_ops *a, *res = NULL;
349 if (kind) {
350 read_lock(&act_mod_lock);
351 list_for_each_entry(a, &act_base, head) {
352 if (strcmp(kind, a->kind) == 0) {
353 if (try_module_get(a->owner))
354 res = a;
355 break;
358 read_unlock(&act_mod_lock);
360 return res;
363 /* lookup by nlattr */
364 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
366 struct tc_action_ops *a, *res = NULL;
368 if (kind) {
369 read_lock(&act_mod_lock);
370 list_for_each_entry(a, &act_base, head) {
371 if (nla_strcmp(kind, a->kind) == 0) {
372 if (try_module_get(a->owner))
373 res = a;
374 break;
377 read_unlock(&act_mod_lock);
379 return res;
382 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
383 struct tcf_result *res)
385 const struct tc_action *a;
386 int ret = -1;
388 if (skb->tc_verd & TC_NCLS) {
389 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
390 ret = TC_ACT_OK;
391 goto exec_done;
393 list_for_each_entry(a, actions, list) {
394 repeat:
395 ret = a->ops->act(skb, a, res);
396 if (TC_MUNGED & skb->tc_verd) {
397 /* copied already, allow trampling */
398 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
399 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
401 if (ret == TC_ACT_REPEAT)
402 goto repeat; /* we need a ttl - JHS */
403 if (ret != TC_ACT_PIPE)
404 goto exec_done;
406 exec_done:
407 return ret;
409 EXPORT_SYMBOL(tcf_action_exec);
411 int tcf_action_destroy(struct list_head *actions, int bind)
413 struct tc_action *a, *tmp;
414 int ret = 0;
416 list_for_each_entry_safe(a, tmp, actions, list) {
417 ret = __tcf_hash_release(a, bind, true);
418 if (ret == ACT_P_DELETED)
419 module_put(a->ops->owner);
420 else if (ret < 0)
421 return ret;
422 list_del(&a->list);
423 kfree(a);
425 return ret;
429 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
431 return a->ops->dump(skb, a, bind, ref);
435 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
437 int err = -EINVAL;
438 unsigned char *b = skb_tail_pointer(skb);
439 struct nlattr *nest;
441 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
442 goto nla_put_failure;
443 if (tcf_action_copy_stats(skb, a, 0))
444 goto nla_put_failure;
445 nest = nla_nest_start(skb, TCA_OPTIONS);
446 if (nest == NULL)
447 goto nla_put_failure;
448 err = tcf_action_dump_old(skb, a, bind, ref);
449 if (err > 0) {
450 nla_nest_end(skb, nest);
451 return err;
454 nla_put_failure:
455 nlmsg_trim(skb, b);
456 return -1;
458 EXPORT_SYMBOL(tcf_action_dump_1);
461 tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
463 struct tc_action *a;
464 int err = -EINVAL;
465 struct nlattr *nest;
467 list_for_each_entry(a, actions, list) {
468 nest = nla_nest_start(skb, a->order);
469 if (nest == NULL)
470 goto nla_put_failure;
471 err = tcf_action_dump_1(skb, a, bind, ref);
472 if (err < 0)
473 goto errout;
474 nla_nest_end(skb, nest);
477 return 0;
479 nla_put_failure:
480 err = -EINVAL;
481 errout:
482 nla_nest_cancel(skb, nest);
483 return err;
486 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
487 struct nlattr *est, char *name, int ovr,
488 int bind)
490 struct tc_action *a;
491 struct tc_action_ops *a_o;
492 char act_name[IFNAMSIZ];
493 struct nlattr *tb[TCA_ACT_MAX + 1];
494 struct nlattr *kind;
495 int err;
497 if (name == NULL) {
498 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
499 if (err < 0)
500 goto err_out;
501 err = -EINVAL;
502 kind = tb[TCA_ACT_KIND];
503 if (kind == NULL)
504 goto err_out;
505 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
506 goto err_out;
507 } else {
508 err = -EINVAL;
509 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
510 goto err_out;
513 a_o = tc_lookup_action_n(act_name);
514 if (a_o == NULL) {
515 #ifdef CONFIG_MODULES
516 rtnl_unlock();
517 request_module("act_%s", act_name);
518 rtnl_lock();
520 a_o = tc_lookup_action_n(act_name);
522 /* We dropped the RTNL semaphore in order to
523 * perform the module load. So, even if we
524 * succeeded in loading the module we have to
525 * tell the caller to replay the request. We
526 * indicate this using -EAGAIN.
528 if (a_o != NULL) {
529 err = -EAGAIN;
530 goto err_mod;
532 #endif
533 err = -ENOENT;
534 goto err_out;
537 err = -ENOMEM;
538 a = kzalloc(sizeof(*a), GFP_KERNEL);
539 if (a == NULL)
540 goto err_mod;
542 a->ops = a_o;
543 INIT_LIST_HEAD(&a->list);
544 /* backward compatibility for policer */
545 if (name == NULL)
546 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
547 else
548 err = a_o->init(net, nla, est, a, ovr, bind);
549 if (err < 0)
550 goto err_free;
552 /* module count goes up only when brand new policy is created
553 * if it exists and is only bound to in a_o->init() then
554 * ACT_P_CREATED is not returned (a zero is).
556 if (err != ACT_P_CREATED)
557 module_put(a_o->owner);
559 return a;
561 err_free:
562 kfree(a);
563 err_mod:
564 module_put(a_o->owner);
565 err_out:
566 return ERR_PTR(err);
569 int tcf_action_init(struct net *net, struct nlattr *nla,
570 struct nlattr *est, char *name, int ovr,
571 int bind, struct list_head *actions)
573 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
574 struct tc_action *act;
575 int err;
576 int i;
578 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
579 if (err < 0)
580 return err;
582 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
583 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
584 if (IS_ERR(act)) {
585 err = PTR_ERR(act);
586 goto err;
588 act->order = i;
589 list_add_tail(&act->list, actions);
591 return 0;
593 err:
594 tcf_action_destroy(actions, bind);
595 return err;
598 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
599 int compat_mode)
601 int err = 0;
602 struct gnet_dump d;
603 struct tcf_common *p = a->priv;
605 if (p == NULL)
606 goto errout;
608 /* compat_mode being true specifies a call that is supposed
609 * to add additional backward compatibility statistic TLVs.
611 if (compat_mode) {
612 if (a->type == TCA_OLD_COMPAT)
613 err = gnet_stats_start_copy_compat(skb, 0,
614 TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d);
615 else
616 return 0;
617 } else
618 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
619 &p->tcfc_lock, &d);
621 if (err < 0)
622 goto errout;
624 if (gnet_stats_copy_basic(&d, NULL, &p->tcfc_bstats) < 0 ||
625 gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
626 &p->tcfc_rate_est) < 0 ||
627 gnet_stats_copy_queue(&d, NULL,
628 &p->tcfc_qstats,
629 p->tcfc_qstats.qlen) < 0)
630 goto errout;
632 if (gnet_stats_finish_copy(&d) < 0)
633 goto errout;
635 return 0;
637 errout:
638 return -1;
641 static int
642 tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
643 u16 flags, int event, int bind, int ref)
645 struct tcamsg *t;
646 struct nlmsghdr *nlh;
647 unsigned char *b = skb_tail_pointer(skb);
648 struct nlattr *nest;
650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
651 if (!nlh)
652 goto out_nlmsg_trim;
653 t = nlmsg_data(nlh);
654 t->tca_family = AF_UNSPEC;
655 t->tca__pad1 = 0;
656 t->tca__pad2 = 0;
658 nest = nla_nest_start(skb, TCA_ACT_TAB);
659 if (nest == NULL)
660 goto out_nlmsg_trim;
662 if (tcf_action_dump(skb, actions, bind, ref) < 0)
663 goto out_nlmsg_trim;
665 nla_nest_end(skb, nest);
667 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
668 return skb->len;
670 out_nlmsg_trim:
671 nlmsg_trim(skb, b);
672 return -1;
675 static int
676 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
677 struct list_head *actions, int event)
679 struct sk_buff *skb;
681 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
682 if (!skb)
683 return -ENOBUFS;
684 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
685 kfree_skb(skb);
686 return -EINVAL;
689 return rtnl_unicast(skb, net, portid);
692 static struct tc_action *create_a(int i)
694 struct tc_action *act;
696 act = kzalloc(sizeof(*act), GFP_KERNEL);
697 if (act == NULL) {
698 pr_debug("create_a: failed to alloc!\n");
699 return NULL;
701 act->order = i;
702 INIT_LIST_HEAD(&act->list);
703 return act;
706 static struct tc_action *
707 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
709 struct nlattr *tb[TCA_ACT_MAX + 1];
710 struct tc_action *a;
711 int index;
712 int err;
714 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
715 if (err < 0)
716 goto err_out;
718 err = -EINVAL;
719 if (tb[TCA_ACT_INDEX] == NULL ||
720 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
721 goto err_out;
722 index = nla_get_u32(tb[TCA_ACT_INDEX]);
724 err = -ENOMEM;
725 a = create_a(0);
726 if (a == NULL)
727 goto err_out;
729 err = -EINVAL;
730 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
731 if (a->ops == NULL) /* could happen in batch of actions */
732 goto err_free;
733 err = -ENOENT;
734 if (a->ops->lookup(a, index) == 0)
735 goto err_mod;
737 module_put(a->ops->owner);
738 return a;
740 err_mod:
741 module_put(a->ops->owner);
742 err_free:
743 kfree(a);
744 err_out:
745 return ERR_PTR(err);
748 static void cleanup_a(struct list_head *actions)
750 struct tc_action *a, *tmp;
752 list_for_each_entry_safe(a, tmp, actions, list) {
753 list_del(&a->list);
754 kfree(a);
758 static int tca_action_flush(struct net *net, struct nlattr *nla,
759 struct nlmsghdr *n, u32 portid)
761 struct sk_buff *skb;
762 unsigned char *b;
763 struct nlmsghdr *nlh;
764 struct tcamsg *t;
765 struct netlink_callback dcb;
766 struct nlattr *nest;
767 struct nlattr *tb[TCA_ACT_MAX + 1];
768 struct nlattr *kind;
769 struct tc_action a;
770 int err = -ENOMEM;
772 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
773 if (!skb) {
774 pr_debug("tca_action_flush: failed skb alloc\n");
775 return err;
778 b = skb_tail_pointer(skb);
780 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
781 if (err < 0)
782 goto err_out;
784 err = -EINVAL;
785 kind = tb[TCA_ACT_KIND];
786 memset(&a, 0, sizeof(struct tc_action));
787 INIT_LIST_HEAD(&a.list);
788 a.ops = tc_lookup_action(kind);
789 if (a.ops == NULL) /*some idjot trying to flush unknown action */
790 goto err_out;
792 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
793 if (!nlh)
794 goto out_module_put;
795 t = nlmsg_data(nlh);
796 t->tca_family = AF_UNSPEC;
797 t->tca__pad1 = 0;
798 t->tca__pad2 = 0;
800 nest = nla_nest_start(skb, TCA_ACT_TAB);
801 if (nest == NULL)
802 goto out_module_put;
804 err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
805 if (err < 0)
806 goto out_module_put;
807 if (err == 0)
808 goto noflush_out;
810 nla_nest_end(skb, nest);
812 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
813 nlh->nlmsg_flags |= NLM_F_ROOT;
814 module_put(a.ops->owner);
815 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
816 n->nlmsg_flags & NLM_F_ECHO);
817 if (err > 0)
818 return 0;
820 return err;
822 out_module_put:
823 module_put(a.ops->owner);
824 err_out:
825 noflush_out:
826 kfree_skb(skb);
827 return err;
830 static int
831 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
832 u32 portid)
834 int ret;
835 struct sk_buff *skb;
837 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
838 if (!skb)
839 return -ENOBUFS;
841 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
842 0, 1) <= 0) {
843 kfree_skb(skb);
844 return -EINVAL;
847 /* now do the delete */
848 ret = tcf_action_destroy(actions, 0);
849 if (ret < 0) {
850 kfree_skb(skb);
851 return ret;
854 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
855 n->nlmsg_flags & NLM_F_ECHO);
856 if (ret > 0)
857 return 0;
858 return ret;
861 static int
862 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
863 u32 portid, int event)
865 int i, ret;
866 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
867 struct tc_action *act;
868 LIST_HEAD(actions);
870 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
871 if (ret < 0)
872 return ret;
874 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
875 if (tb[1] != NULL)
876 return tca_action_flush(net, tb[1], n, portid);
877 else
878 return -EINVAL;
881 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
882 act = tcf_action_get_1(tb[i], n, portid);
883 if (IS_ERR(act)) {
884 ret = PTR_ERR(act);
885 goto err;
887 act->order = i;
888 list_add_tail(&act->list, &actions);
891 if (event == RTM_GETACTION)
892 ret = act_get_notify(net, portid, n, &actions, event);
893 else { /* delete */
894 ret = tcf_del_notify(net, n, &actions, portid);
895 if (ret)
896 goto err;
897 return ret;
899 err:
900 cleanup_a(&actions);
901 return ret;
904 static int
905 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
906 u32 portid)
908 struct sk_buff *skb;
909 int err = 0;
911 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
912 if (!skb)
913 return -ENOBUFS;
915 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
916 RTM_NEWACTION, 0, 0) <= 0) {
917 kfree_skb(skb);
918 return -EINVAL;
921 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
922 n->nlmsg_flags & NLM_F_ECHO);
923 if (err > 0)
924 err = 0;
925 return err;
928 static int
929 tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
930 u32 portid, int ovr)
932 int ret = 0;
933 LIST_HEAD(actions);
935 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
936 if (ret)
937 goto done;
939 /* dump then free all the actions after update; inserted policy
940 * stays intact
942 ret = tcf_add_notify(net, n, &actions, portid);
943 cleanup_a(&actions);
944 done:
945 return ret;
948 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
950 struct net *net = sock_net(skb->sk);
951 struct nlattr *tca[TCA_ACT_MAX + 1];
952 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
953 int ret = 0, ovr = 0;
955 if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
956 return -EPERM;
958 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
959 if (ret < 0)
960 return ret;
962 if (tca[TCA_ACT_TAB] == NULL) {
963 pr_notice("tc_ctl_action: received NO action attribs\n");
964 return -EINVAL;
967 /* n->nlmsg_flags & NLM_F_CREATE */
968 switch (n->nlmsg_type) {
969 case RTM_NEWACTION:
970 /* we are going to assume all other flags
971 * imply create only if it doesn't exist
972 * Note that CREATE | EXCL implies that
973 * but since we want avoid ambiguity (eg when flags
974 * is zero) then just set this
976 if (n->nlmsg_flags & NLM_F_REPLACE)
977 ovr = 1;
978 replay:
979 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
980 if (ret == -EAGAIN)
981 goto replay;
982 break;
983 case RTM_DELACTION:
984 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
985 portid, RTM_DELACTION);
986 break;
987 case RTM_GETACTION:
988 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
989 portid, RTM_GETACTION);
990 break;
991 default:
992 BUG();
995 return ret;
998 static struct nlattr *
999 find_dump_kind(const struct nlmsghdr *n)
1001 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1002 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1003 struct nlattr *nla[TCAA_MAX + 1];
1004 struct nlattr *kind;
1006 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1007 return NULL;
1008 tb1 = nla[TCA_ACT_TAB];
1009 if (tb1 == NULL)
1010 return NULL;
1012 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1013 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1014 return NULL;
1016 if (tb[1] == NULL)
1017 return NULL;
1018 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1019 nla_len(tb[1]), NULL) < 0)
1020 return NULL;
1021 kind = tb2[TCA_ACT_KIND];
1023 return kind;
1026 static int
1027 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1029 struct nlmsghdr *nlh;
1030 unsigned char *b = skb_tail_pointer(skb);
1031 struct nlattr *nest;
1032 struct tc_action_ops *a_o;
1033 struct tc_action a;
1034 int ret = 0;
1035 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1036 struct nlattr *kind = find_dump_kind(cb->nlh);
1038 if (kind == NULL) {
1039 pr_info("tc_dump_action: action bad kind\n");
1040 return 0;
1043 a_o = tc_lookup_action(kind);
1044 if (a_o == NULL)
1045 return 0;
1047 memset(&a, 0, sizeof(struct tc_action));
1048 a.ops = a_o;
1050 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1051 cb->nlh->nlmsg_type, sizeof(*t), 0);
1052 if (!nlh)
1053 goto out_module_put;
1054 t = nlmsg_data(nlh);
1055 t->tca_family = AF_UNSPEC;
1056 t->tca__pad1 = 0;
1057 t->tca__pad2 = 0;
1059 nest = nla_nest_start(skb, TCA_ACT_TAB);
1060 if (nest == NULL)
1061 goto out_module_put;
1063 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1064 if (ret < 0)
1065 goto out_module_put;
1067 if (ret > 0) {
1068 nla_nest_end(skb, nest);
1069 ret = skb->len;
1070 } else
1071 nla_nest_cancel(skb, nest);
1073 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1074 if (NETLINK_CB(cb->skb).portid && ret)
1075 nlh->nlmsg_flags |= NLM_F_MULTI;
1076 module_put(a_o->owner);
1077 return skb->len;
1079 out_module_put:
1080 module_put(a_o->owner);
1081 nlmsg_trim(skb, b);
1082 return skb->len;
1085 static int __init tc_action_init(void)
1087 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1088 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1089 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1090 NULL);
1092 return 0;
1095 subsys_initcall(tc_action_init);