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>
26 #include <net/sch_generic.h>
27 #include <net/act_api.h>
28 #include <net/netlink.h>
30 static void free_tcf(struct rcu_head *head)
32 struct tcf_common *p = container_of(head, struct tcf_common, tcfc_rcu);
34 free_percpu(p->cpu_bstats);
35 free_percpu(p->cpu_qstats);
39 static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *a)
41 struct tcf_common *p = (struct tcf_common *)a;
43 spin_lock_bh(&hinfo->lock);
44 hlist_del(&p->tcfc_head);
45 spin_unlock_bh(&hinfo->lock);
46 gen_kill_estimator(&p->tcfc_bstats,
49 * gen_estimator est_timer() might access p->tcfc_lock
50 * or bstats, wait a RCU grace period before freeing p
52 call_rcu(&p->tcfc_rcu, free_tcf);
55 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict)
57 struct tcf_common *p = (struct tcf_common *)a;
63 else if (strict && p->tcfc_bindcnt > 0)
67 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
69 a->ops->cleanup(a, bind);
71 tcf_hash_destroy(a->hinfo, a);
78 EXPORT_SYMBOL(__tcf_hash_release);
80 static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
81 struct netlink_callback *cb)
83 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
86 spin_lock_bh(&hinfo->lock);
90 for (i = 0; i < (hinfo->hmask + 1); i++) {
91 struct hlist_head *head;
94 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
96 hlist_for_each_entry_rcu(p, head, tcfc_head) {
101 nest = nla_nest_start(skb, n_i);
103 goto nla_put_failure;
104 err = tcf_action_dump_1(skb, (struct tc_action *)p, 0, 0);
107 nlmsg_trim(skb, nest);
110 nla_nest_end(skb, nest);
112 if (n_i >= TCA_ACT_MAX_PRIO)
117 spin_unlock_bh(&hinfo->lock);
123 nla_nest_cancel(skb, nest);
127 static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
128 const struct tc_action_ops *ops)
134 nest = nla_nest_start(skb, 0);
136 goto nla_put_failure;
137 if (nla_put_string(skb, TCA_KIND, ops->kind))
138 goto nla_put_failure;
139 for (i = 0; i < (hinfo->hmask + 1); i++) {
140 struct hlist_head *head;
141 struct hlist_node *n;
142 struct tcf_common *p;
144 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
145 hlist_for_each_entry_safe(p, n, head, tcfc_head) {
146 ret = __tcf_hash_release((struct tc_action *)p, false, true);
147 if (ret == ACT_P_DELETED) {
148 module_put(p->tcfc_act.ops->owner);
151 goto nla_put_failure;
154 if (nla_put_u32(skb, TCA_FCNT, n_i))
155 goto nla_put_failure;
156 nla_nest_end(skb, nest);
160 nla_nest_cancel(skb, nest);
164 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
165 struct netlink_callback *cb, int type,
166 const struct tc_action_ops *ops)
168 struct tcf_hashinfo *hinfo = tn->hinfo;
170 if (type == RTM_DELACTION) {
171 return tcf_del_walker(hinfo, skb, ops);
172 } else if (type == RTM_GETACTION) {
173 return tcf_dump_walker(hinfo, skb, cb);
175 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
179 EXPORT_SYMBOL(tcf_generic_walker);
181 static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
183 struct tcf_common *p = NULL;
184 struct hlist_head *head;
186 spin_lock_bh(&hinfo->lock);
187 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
188 hlist_for_each_entry_rcu(p, head, tcfc_head)
189 if (p->tcfc_index == index)
191 spin_unlock_bh(&hinfo->lock);
196 u32 tcf_hash_new_index(struct tc_action_net *tn)
198 struct tcf_hashinfo *hinfo = tn->hinfo;
199 u32 val = hinfo->index;
204 } while (tcf_hash_lookup(val, hinfo));
209 EXPORT_SYMBOL(tcf_hash_new_index);
211 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
213 struct tcf_hashinfo *hinfo = tn->hinfo;
214 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
222 EXPORT_SYMBOL(tcf_hash_search);
224 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
227 struct tcf_hashinfo *hinfo = tn->hinfo;
228 struct tcf_common *p = NULL;
229 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
238 EXPORT_SYMBOL(tcf_hash_check);
240 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
242 struct tcf_common *pc = (struct tcf_common *)a;
244 gen_kill_estimator(&pc->tcfc_bstats,
246 call_rcu(&pc->tcfc_rcu, free_tcf);
248 EXPORT_SYMBOL(tcf_hash_cleanup);
250 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
251 struct tc_action **a, const struct tc_action_ops *ops,
252 int bind, bool cpustats)
254 struct tcf_common *p = kzalloc(ops->size, GFP_KERNEL);
255 struct tcf_hashinfo *hinfo = tn->hinfo;
265 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
266 if (!p->cpu_bstats) {
271 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
272 if (!p->cpu_qstats) {
274 free_percpu(p->cpu_bstats);
278 spin_lock_init(&p->tcfc_lock);
279 INIT_HLIST_NODE(&p->tcfc_head);
280 p->tcfc_index = index ? index : tcf_hash_new_index(tn);
281 p->tcfc_tm.install = jiffies;
282 p->tcfc_tm.lastuse = jiffies;
283 p->tcfc_tm.firstuse = 0;
285 err = gen_new_estimator(&p->tcfc_bstats, p->cpu_bstats,
287 &p->tcfc_lock, NULL, est);
289 free_percpu(p->cpu_qstats);
294 p->tcfc_act.hinfo = hinfo;
295 p->tcfc_act.ops = ops;
296 INIT_LIST_HEAD(&p->tcfc_act.list);
300 EXPORT_SYMBOL(tcf_hash_create);
302 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a)
304 struct tcf_common *p = (struct tcf_common *)a;
305 struct tcf_hashinfo *hinfo = tn->hinfo;
306 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
308 spin_lock_bh(&hinfo->lock);
309 hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
310 spin_unlock_bh(&hinfo->lock);
312 EXPORT_SYMBOL(tcf_hash_insert);
314 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
315 struct tcf_hashinfo *hinfo)
319 for (i = 0; i < hinfo->hmask + 1; i++) {
320 struct tcf_common *p;
321 struct hlist_node *n;
323 hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfc_head) {
326 ret = __tcf_hash_release((struct tc_action *)p, false, true);
327 if (ret == ACT_P_DELETED)
328 module_put(ops->owner);
335 EXPORT_SYMBOL(tcf_hashinfo_destroy);
337 static LIST_HEAD(act_base);
338 static DEFINE_RWLOCK(act_mod_lock);
340 int tcf_register_action(struct tc_action_ops *act,
341 struct pernet_operations *ops)
343 struct tc_action_ops *a;
346 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
349 write_lock(&act_mod_lock);
350 list_for_each_entry(a, &act_base, head) {
351 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
352 write_unlock(&act_mod_lock);
356 list_add_tail(&act->head, &act_base);
357 write_unlock(&act_mod_lock);
359 ret = register_pernet_subsys(ops);
361 tcf_unregister_action(act, ops);
367 EXPORT_SYMBOL(tcf_register_action);
369 int tcf_unregister_action(struct tc_action_ops *act,
370 struct pernet_operations *ops)
372 struct tc_action_ops *a;
375 unregister_pernet_subsys(ops);
377 write_lock(&act_mod_lock);
378 list_for_each_entry(a, &act_base, head) {
380 list_del(&act->head);
385 write_unlock(&act_mod_lock);
388 EXPORT_SYMBOL(tcf_unregister_action);
391 static struct tc_action_ops *tc_lookup_action_n(char *kind)
393 struct tc_action_ops *a, *res = NULL;
396 read_lock(&act_mod_lock);
397 list_for_each_entry(a, &act_base, head) {
398 if (strcmp(kind, a->kind) == 0) {
399 if (try_module_get(a->owner))
404 read_unlock(&act_mod_lock);
409 /* lookup by nlattr */
410 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
412 struct tc_action_ops *a, *res = NULL;
415 read_lock(&act_mod_lock);
416 list_for_each_entry(a, &act_base, head) {
417 if (nla_strcmp(kind, a->kind) == 0) {
418 if (try_module_get(a->owner))
423 read_unlock(&act_mod_lock);
428 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
429 struct tcf_result *res)
431 const struct tc_action *a;
434 if (skb->tc_verd & TC_NCLS) {
435 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
439 list_for_each_entry(a, actions, list) {
441 ret = a->ops->act(skb, a, res);
442 if (ret == TC_ACT_REPEAT)
443 goto repeat; /* we need a ttl - JHS */
444 if (ret != TC_ACT_PIPE)
450 EXPORT_SYMBOL(tcf_action_exec);
452 int tcf_action_destroy(struct list_head *actions, int bind)
454 struct tc_action *a, *tmp;
457 list_for_each_entry_safe(a, tmp, actions, list) {
458 ret = __tcf_hash_release(a, bind, true);
459 if (ret == ACT_P_DELETED)
460 module_put(a->ops->owner);
468 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
470 return a->ops->dump(skb, a, bind, ref);
474 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
477 unsigned char *b = skb_tail_pointer(skb);
480 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
481 goto nla_put_failure;
482 if (tcf_action_copy_stats(skb, a, 0))
483 goto nla_put_failure;
484 nest = nla_nest_start(skb, TCA_OPTIONS);
486 goto nla_put_failure;
487 err = tcf_action_dump_old(skb, a, bind, ref);
489 nla_nest_end(skb, nest);
497 EXPORT_SYMBOL(tcf_action_dump_1);
499 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
506 list_for_each_entry(a, actions, list) {
507 nest = nla_nest_start(skb, a->order);
509 goto nla_put_failure;
510 err = tcf_action_dump_1(skb, a, bind, ref);
513 nla_nest_end(skb, nest);
521 nla_nest_cancel(skb, nest);
525 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
526 struct nlattr *est, char *name, int ovr,
530 struct tc_action_ops *a_o;
531 char act_name[IFNAMSIZ];
532 struct nlattr *tb[TCA_ACT_MAX + 1];
537 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
541 kind = tb[TCA_ACT_KIND];
544 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
548 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
552 a_o = tc_lookup_action_n(act_name);
554 #ifdef CONFIG_MODULES
556 request_module("act_%s", act_name);
559 a_o = tc_lookup_action_n(act_name);
561 /* We dropped the RTNL semaphore in order to
562 * perform the module load. So, even if we
563 * succeeded in loading the module we have to
564 * tell the caller to replay the request. We
565 * indicate this using -EAGAIN.
576 /* backward compatibility for policer */
578 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
580 err = a_o->init(net, nla, est, &a, ovr, bind);
584 /* module count goes up only when brand new policy is created
585 * if it exists and is only bound to in a_o->init() then
586 * ACT_P_CREATED is not returned (a zero is).
588 if (err != ACT_P_CREATED)
589 module_put(a_o->owner);
594 module_put(a_o->owner);
599 int tcf_action_init(struct net *net, struct nlattr *nla,
600 struct nlattr *est, char *name, int ovr,
601 int bind, struct list_head *actions)
603 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
604 struct tc_action *act;
608 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
612 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
613 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
619 list_add_tail(&act->list, actions);
624 tcf_action_destroy(actions, bind);
628 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
633 struct tcf_common *p = (struct tcf_common *)a;
638 /* compat_mode being true specifies a call that is supposed
639 * to add additional backward compatibility statistic TLVs.
642 if (a->type == TCA_OLD_COMPAT)
643 err = gnet_stats_start_copy_compat(skb, 0,
651 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
652 &p->tcfc_lock, &d, TCA_ACT_PAD);
657 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfc_bstats) < 0 ||
658 gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
659 &p->tcfc_rate_est) < 0 ||
660 gnet_stats_copy_queue(&d, p->cpu_qstats,
662 p->tcfc_qstats.qlen) < 0)
665 if (gnet_stats_finish_copy(&d) < 0)
674 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
675 u32 portid, u32 seq, u16 flags, int event, int bind,
679 struct nlmsghdr *nlh;
680 unsigned char *b = skb_tail_pointer(skb);
683 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
687 t->tca_family = AF_UNSPEC;
691 nest = nla_nest_start(skb, TCA_ACT_TAB);
695 if (tcf_action_dump(skb, actions, bind, ref) < 0)
698 nla_nest_end(skb, nest);
700 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
709 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
710 struct list_head *actions, int event)
714 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
717 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
723 return rtnl_unicast(skb, net, portid);
726 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
727 struct nlmsghdr *n, u32 portid)
729 struct nlattr *tb[TCA_ACT_MAX + 1];
730 const struct tc_action_ops *ops;
735 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
740 if (tb[TCA_ACT_INDEX] == NULL ||
741 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
743 index = nla_get_u32(tb[TCA_ACT_INDEX]);
746 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
747 if (!ops) /* could happen in batch of actions */
750 if (ops->lookup(net, &a, index) == 0)
753 module_put(ops->owner);
757 module_put(ops->owner);
762 static void cleanup_a(struct list_head *actions)
764 struct tc_action *a, *tmp;
766 list_for_each_entry_safe(a, tmp, actions, list) {
772 static int tca_action_flush(struct net *net, struct nlattr *nla,
773 struct nlmsghdr *n, u32 portid)
777 struct nlmsghdr *nlh;
779 struct netlink_callback dcb;
781 struct nlattr *tb[TCA_ACT_MAX + 1];
782 const struct tc_action_ops *ops;
786 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
788 pr_debug("tca_action_flush: failed skb alloc\n");
792 b = skb_tail_pointer(skb);
794 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
799 kind = tb[TCA_ACT_KIND];
800 ops = tc_lookup_action(kind);
801 if (!ops) /*some idjot trying to flush unknown action */
804 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
809 t->tca_family = AF_UNSPEC;
813 nest = nla_nest_start(skb, TCA_ACT_TAB);
817 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
823 nla_nest_end(skb, nest);
825 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
826 nlh->nlmsg_flags |= NLM_F_ROOT;
827 module_put(ops->owner);
828 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
829 n->nlmsg_flags & NLM_F_ECHO);
836 module_put(ops->owner);
844 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
850 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
854 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
860 /* now do the delete */
861 ret = tcf_action_destroy(actions, 0);
867 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
868 n->nlmsg_flags & NLM_F_ECHO);
875 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
876 u32 portid, int event)
879 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
880 struct tc_action *act;
883 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
887 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
889 return tca_action_flush(net, tb[1], n, portid);
894 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
895 act = tcf_action_get_1(net, tb[i], n, portid);
901 list_add_tail(&act->list, &actions);
904 if (event == RTM_GETACTION)
905 ret = act_get_notify(net, portid, n, &actions, event);
907 ret = tcf_del_notify(net, n, &actions, portid);
918 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
924 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
928 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
929 RTM_NEWACTION, 0, 0) <= 0) {
934 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
935 n->nlmsg_flags & NLM_F_ECHO);
942 tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
948 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
952 /* dump then free all the actions after update; inserted policy
955 ret = tcf_add_notify(net, n, &actions, portid);
961 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
963 struct net *net = sock_net(skb->sk);
964 struct nlattr *tca[TCA_ACT_MAX + 1];
965 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
966 int ret = 0, ovr = 0;
968 if ((n->nlmsg_type != RTM_GETACTION) &&
969 !netlink_capable(skb, CAP_NET_ADMIN))
972 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
976 if (tca[TCA_ACT_TAB] == NULL) {
977 pr_notice("tc_ctl_action: received NO action attribs\n");
981 /* n->nlmsg_flags & NLM_F_CREATE */
982 switch (n->nlmsg_type) {
984 /* we are going to assume all other flags
985 * imply create only if it doesn't exist
986 * Note that CREATE | EXCL implies that
987 * but since we want avoid ambiguity (eg when flags
988 * is zero) then just set this
990 if (n->nlmsg_flags & NLM_F_REPLACE)
993 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
998 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
999 portid, RTM_DELACTION);
1002 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1003 portid, RTM_GETACTION);
1012 static struct nlattr *
1013 find_dump_kind(const struct nlmsghdr *n)
1015 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1016 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1017 struct nlattr *nla[TCAA_MAX + 1];
1018 struct nlattr *kind;
1020 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1022 tb1 = nla[TCA_ACT_TAB];
1026 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1027 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1032 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1033 nla_len(tb[1]), NULL) < 0)
1035 kind = tb2[TCA_ACT_KIND];
1041 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1043 struct net *net = sock_net(skb->sk);
1044 struct nlmsghdr *nlh;
1045 unsigned char *b = skb_tail_pointer(skb);
1046 struct nlattr *nest;
1047 struct tc_action_ops *a_o;
1049 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1050 struct nlattr *kind = find_dump_kind(cb->nlh);
1053 pr_info("tc_dump_action: action bad kind\n");
1057 a_o = tc_lookup_action(kind);
1061 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1062 cb->nlh->nlmsg_type, sizeof(*t), 0);
1064 goto out_module_put;
1065 t = nlmsg_data(nlh);
1066 t->tca_family = AF_UNSPEC;
1070 nest = nla_nest_start(skb, TCA_ACT_TAB);
1072 goto out_module_put;
1074 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1076 goto out_module_put;
1079 nla_nest_end(skb, nest);
1084 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1085 if (NETLINK_CB(cb->skb).portid && ret)
1086 nlh->nlmsg_flags |= NLM_F_MULTI;
1087 module_put(a_o->owner);
1091 module_put(a_o->owner);
1096 static int __init tc_action_init(void)
1098 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1099 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1100 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1106 subsys_initcall(tc_action_init);