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/pkt_cls.h>
28 #include <net/act_api.h>
29 #include <net/netlink.h>
31 static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
33 u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
37 a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
43 static void tcf_action_goto_chain_fini(struct tc_action *a)
45 tcf_chain_put(a->goto_chain);
48 static void tcf_action_goto_chain_exec(const struct tc_action *a,
49 struct tcf_result *res)
51 const struct tcf_chain *chain = a->goto_chain;
53 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
56 static void free_tcf(struct rcu_head *head)
58 struct tc_action *p = container_of(head, struct tc_action, tcfa_rcu);
60 free_percpu(p->cpu_bstats);
61 free_percpu(p->cpu_qstats);
64 kfree(p->act_cookie->data);
68 tcf_action_goto_chain_fini(p);
73 static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *p)
75 spin_lock_bh(&hinfo->lock);
76 hlist_del(&p->tcfa_head);
77 spin_unlock_bh(&hinfo->lock);
78 gen_kill_estimator(&p->tcfa_rate_est);
80 * gen_estimator est_timer() might access p->tcfa_lock
81 * or bstats, wait a RCU grace period before freeing p
83 call_rcu(&p->tcfa_rcu, free_tcf);
86 int __tcf_hash_release(struct tc_action *p, bool bind, bool strict)
93 else if (strict && p->tcfa_bindcnt > 0)
97 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
99 p->ops->cleanup(p, bind);
100 tcf_hash_destroy(p->hinfo, p);
107 EXPORT_SYMBOL(__tcf_hash_release);
109 static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
110 struct netlink_callback *cb)
112 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
115 spin_lock_bh(&hinfo->lock);
119 for (i = 0; i < (hinfo->hmask + 1); i++) {
120 struct hlist_head *head;
123 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
125 hlist_for_each_entry_rcu(p, head, tcfa_head) {
130 nest = nla_nest_start(skb, n_i);
132 goto nla_put_failure;
133 err = tcf_action_dump_1(skb, p, 0, 0);
136 nlmsg_trim(skb, nest);
139 nla_nest_end(skb, nest);
141 if (n_i >= TCA_ACT_MAX_PRIO)
146 spin_unlock_bh(&hinfo->lock);
152 nla_nest_cancel(skb, nest);
156 static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
157 const struct tc_action_ops *ops)
163 nest = nla_nest_start(skb, 0);
165 goto nla_put_failure;
166 if (nla_put_string(skb, TCA_KIND, ops->kind))
167 goto nla_put_failure;
168 for (i = 0; i < (hinfo->hmask + 1); i++) {
169 struct hlist_head *head;
170 struct hlist_node *n;
173 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
174 hlist_for_each_entry_safe(p, n, head, tcfa_head) {
175 ret = __tcf_hash_release(p, false, true);
176 if (ret == ACT_P_DELETED) {
177 module_put(p->ops->owner);
180 goto nla_put_failure;
183 if (nla_put_u32(skb, TCA_FCNT, n_i))
184 goto nla_put_failure;
185 nla_nest_end(skb, nest);
189 nla_nest_cancel(skb, nest);
193 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
194 struct netlink_callback *cb, int type,
195 const struct tc_action_ops *ops)
197 struct tcf_hashinfo *hinfo = tn->hinfo;
199 if (type == RTM_DELACTION) {
200 return tcf_del_walker(hinfo, skb, ops);
201 } else if (type == RTM_GETACTION) {
202 return tcf_dump_walker(hinfo, skb, cb);
204 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
208 EXPORT_SYMBOL(tcf_generic_walker);
210 static struct tc_action *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
212 struct tc_action *p = NULL;
213 struct hlist_head *head;
215 spin_lock_bh(&hinfo->lock);
216 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
217 hlist_for_each_entry_rcu(p, head, tcfa_head)
218 if (p->tcfa_index == index)
220 spin_unlock_bh(&hinfo->lock);
225 u32 tcf_hash_new_index(struct tc_action_net *tn)
227 struct tcf_hashinfo *hinfo = tn->hinfo;
228 u32 val = hinfo->index;
233 } while (tcf_hash_lookup(val, hinfo));
238 EXPORT_SYMBOL(tcf_hash_new_index);
240 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
242 struct tcf_hashinfo *hinfo = tn->hinfo;
243 struct tc_action *p = tcf_hash_lookup(index, hinfo);
251 EXPORT_SYMBOL(tcf_hash_search);
253 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
256 struct tcf_hashinfo *hinfo = tn->hinfo;
257 struct tc_action *p = NULL;
259 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
268 EXPORT_SYMBOL(tcf_hash_check);
270 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
273 gen_kill_estimator(&a->tcfa_rate_est);
274 call_rcu(&a->tcfa_rcu, free_tcf);
276 EXPORT_SYMBOL(tcf_hash_cleanup);
278 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
279 struct tc_action **a, const struct tc_action_ops *ops,
280 int bind, bool cpustats)
282 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
283 struct tcf_hashinfo *hinfo = tn->hinfo;
293 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
294 if (!p->cpu_bstats) {
299 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
300 if (!p->cpu_qstats) {
302 free_percpu(p->cpu_bstats);
306 spin_lock_init(&p->tcfa_lock);
307 INIT_HLIST_NODE(&p->tcfa_head);
308 p->tcfa_index = index ? index : tcf_hash_new_index(tn);
309 p->tcfa_tm.install = jiffies;
310 p->tcfa_tm.lastuse = jiffies;
311 p->tcfa_tm.firstuse = 0;
313 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
315 &p->tcfa_lock, NULL, est);
317 free_percpu(p->cpu_qstats);
324 INIT_LIST_HEAD(&p->list);
328 EXPORT_SYMBOL(tcf_hash_create);
330 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a)
332 struct tcf_hashinfo *hinfo = tn->hinfo;
333 unsigned int h = tcf_hash(a->tcfa_index, hinfo->hmask);
335 spin_lock_bh(&hinfo->lock);
336 hlist_add_head(&a->tcfa_head, &hinfo->htab[h]);
337 spin_unlock_bh(&hinfo->lock);
339 EXPORT_SYMBOL(tcf_hash_insert);
341 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
342 struct tcf_hashinfo *hinfo)
346 for (i = 0; i < hinfo->hmask + 1; i++) {
348 struct hlist_node *n;
350 hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfa_head) {
353 ret = __tcf_hash_release(p, false, true);
354 if (ret == ACT_P_DELETED)
355 module_put(ops->owner);
362 EXPORT_SYMBOL(tcf_hashinfo_destroy);
364 static LIST_HEAD(act_base);
365 static DEFINE_RWLOCK(act_mod_lock);
367 int tcf_register_action(struct tc_action_ops *act,
368 struct pernet_operations *ops)
370 struct tc_action_ops *a;
373 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
376 /* We have to register pernet ops before making the action ops visible,
377 * otherwise tcf_action_init_1() could get a partially initialized
380 ret = register_pernet_subsys(ops);
384 write_lock(&act_mod_lock);
385 list_for_each_entry(a, &act_base, head) {
386 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
387 write_unlock(&act_mod_lock);
388 unregister_pernet_subsys(ops);
392 list_add_tail(&act->head, &act_base);
393 write_unlock(&act_mod_lock);
397 EXPORT_SYMBOL(tcf_register_action);
399 int tcf_unregister_action(struct tc_action_ops *act,
400 struct pernet_operations *ops)
402 struct tc_action_ops *a;
405 write_lock(&act_mod_lock);
406 list_for_each_entry(a, &act_base, head) {
408 list_del(&act->head);
413 write_unlock(&act_mod_lock);
415 unregister_pernet_subsys(ops);
418 EXPORT_SYMBOL(tcf_unregister_action);
421 static struct tc_action_ops *tc_lookup_action_n(char *kind)
423 struct tc_action_ops *a, *res = NULL;
426 read_lock(&act_mod_lock);
427 list_for_each_entry(a, &act_base, head) {
428 if (strcmp(kind, a->kind) == 0) {
429 if (try_module_get(a->owner))
434 read_unlock(&act_mod_lock);
439 /* lookup by nlattr */
440 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
442 struct tc_action_ops *a, *res = NULL;
445 read_lock(&act_mod_lock);
446 list_for_each_entry(a, &act_base, head) {
447 if (nla_strcmp(kind, a->kind) == 0) {
448 if (try_module_get(a->owner))
453 read_unlock(&act_mod_lock);
458 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
459 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
460 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
461 int nr_actions, struct tcf_result *res)
465 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
467 if (skb_skip_tc_classify(skb))
471 for (i = 0; i < nr_actions; i++) {
472 const struct tc_action *a = actions[i];
474 if (jmp_prgcnt > 0) {
479 ret = a->ops->act(skb, a, res);
480 if (ret == TC_ACT_REPEAT)
481 goto repeat; /* we need a ttl - JHS */
483 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
484 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
485 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
486 /* faulty opcode, stop pipeline */
491 goto restart_act_graph;
492 else /* faulty graph, stop pipeline */
495 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
496 tcf_action_goto_chain_exec(a, res);
499 if (ret != TC_ACT_PIPE)
505 EXPORT_SYMBOL(tcf_action_exec);
507 int tcf_action_destroy(struct list_head *actions, int bind)
509 struct tc_action *a, *tmp;
512 list_for_each_entry_safe(a, tmp, actions, list) {
513 ret = __tcf_hash_release(a, bind, true);
514 if (ret == ACT_P_DELETED)
515 module_put(a->ops->owner);
523 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
525 return a->ops->dump(skb, a, bind, ref);
529 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
532 unsigned char *b = skb_tail_pointer(skb);
535 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
536 goto nla_put_failure;
537 if (tcf_action_copy_stats(skb, a, 0))
538 goto nla_put_failure;
540 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
541 a->act_cookie->data))
542 goto nla_put_failure;
545 nest = nla_nest_start(skb, TCA_OPTIONS);
547 goto nla_put_failure;
548 err = tcf_action_dump_old(skb, a, bind, ref);
550 nla_nest_end(skb, nest);
558 EXPORT_SYMBOL(tcf_action_dump_1);
560 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
567 list_for_each_entry(a, actions, list) {
568 nest = nla_nest_start(skb, a->order);
570 goto nla_put_failure;
571 err = tcf_action_dump_1(skb, a, bind, ref);
574 nla_nest_end(skb, nest);
582 nla_nest_cancel(skb, nest);
586 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
588 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
592 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
597 c->len = nla_len(tb[TCA_ACT_COOKIE]);
602 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
603 struct nlattr *nla, struct nlattr *est,
604 char *name, int ovr, int bind)
607 struct tc_action_ops *a_o;
608 struct tc_cookie *cookie = NULL;
609 char act_name[IFNAMSIZ];
610 struct nlattr *tb[TCA_ACT_MAX + 1];
615 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
619 kind = tb[TCA_ACT_KIND];
622 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
624 if (tb[TCA_ACT_COOKIE]) {
625 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
627 if (cklen > TC_COOKIE_MAX_SIZE)
630 cookie = nla_memdup_cookie(tb);
638 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
642 a_o = tc_lookup_action_n(act_name);
644 #ifdef CONFIG_MODULES
646 request_module("act_%s", act_name);
649 a_o = tc_lookup_action_n(act_name);
651 /* We dropped the RTNL semaphore in order to
652 * perform the module load. So, even if we
653 * succeeded in loading the module we have to
654 * tell the caller to replay the request. We
655 * indicate this using -EAGAIN.
666 /* backward compatibility for policer */
668 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
670 err = a_o->init(net, nla, est, &a, ovr, bind);
674 if (name == NULL && tb[TCA_ACT_COOKIE]) {
676 kfree(a->act_cookie->data);
677 kfree(a->act_cookie);
679 a->act_cookie = cookie;
682 /* module count goes up only when brand new policy is created
683 * if it exists and is only bound to in a_o->init() then
684 * ACT_P_CREATED is not returned (a zero is).
686 if (err != ACT_P_CREATED)
687 module_put(a_o->owner);
689 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
690 err = tcf_action_goto_chain_init(a, tp);
694 list_add_tail(&a->list, &actions);
695 tcf_action_destroy(&actions, bind);
703 module_put(a_o->owner);
712 static void cleanup_a(struct list_head *actions, int ovr)
719 list_for_each_entry(a, actions, list)
723 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
724 struct nlattr *est, char *name, int ovr, int bind,
725 struct list_head *actions)
727 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
728 struct tc_action *act;
732 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
736 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
737 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind);
745 list_add_tail(&act->list, actions);
748 /* Remove the temp refcnt which was necessary to protect against
749 * destroying an existing action which was being replaced
751 cleanup_a(actions, ovr);
755 tcf_action_destroy(actions, bind);
759 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
768 /* compat_mode being true specifies a call that is supposed
769 * to add additional backward compatibility statistic TLVs.
772 if (p->type == TCA_OLD_COMPAT)
773 err = gnet_stats_start_copy_compat(skb, 0,
781 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
782 &p->tcfa_lock, &d, TCA_ACT_PAD);
787 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
788 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
789 gnet_stats_copy_queue(&d, p->cpu_qstats,
791 p->tcfa_qstats.qlen) < 0)
794 if (gnet_stats_finish_copy(&d) < 0)
803 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
804 u32 portid, u32 seq, u16 flags, int event, int bind,
808 struct nlmsghdr *nlh;
809 unsigned char *b = skb_tail_pointer(skb);
812 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
816 t->tca_family = AF_UNSPEC;
820 nest = nla_nest_start(skb, TCA_ACT_TAB);
824 if (tcf_action_dump(skb, actions, bind, ref) < 0)
827 nla_nest_end(skb, nest);
829 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
838 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
839 struct list_head *actions, int event)
843 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
846 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
852 return rtnl_unicast(skb, net, portid);
855 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
856 struct nlmsghdr *n, u32 portid)
858 struct nlattr *tb[TCA_ACT_MAX + 1];
859 const struct tc_action_ops *ops;
864 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
869 if (tb[TCA_ACT_INDEX] == NULL ||
870 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
872 index = nla_get_u32(tb[TCA_ACT_INDEX]);
875 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
876 if (!ops) /* could happen in batch of actions */
879 if (ops->lookup(net, &a, index) == 0)
882 module_put(ops->owner);
886 module_put(ops->owner);
891 static int tca_action_flush(struct net *net, struct nlattr *nla,
892 struct nlmsghdr *n, u32 portid)
896 struct nlmsghdr *nlh;
898 struct netlink_callback dcb;
900 struct nlattr *tb[TCA_ACT_MAX + 1];
901 const struct tc_action_ops *ops;
905 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
907 pr_debug("tca_action_flush: failed skb alloc\n");
911 b = skb_tail_pointer(skb);
913 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
918 kind = tb[TCA_ACT_KIND];
919 ops = tc_lookup_action(kind);
920 if (!ops) /*some idjot trying to flush unknown action */
923 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
928 t->tca_family = AF_UNSPEC;
932 nest = nla_nest_start(skb, TCA_ACT_TAB);
936 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
940 nla_nest_end(skb, nest);
942 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
943 nlh->nlmsg_flags |= NLM_F_ROOT;
944 module_put(ops->owner);
945 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
946 n->nlmsg_flags & NLM_F_ECHO);
953 module_put(ops->owner);
960 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
966 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
970 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
976 /* now do the delete */
977 ret = tcf_action_destroy(actions, 0);
983 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
984 n->nlmsg_flags & NLM_F_ECHO);
991 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
992 u32 portid, int event)
995 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
996 struct tc_action *act;
999 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
1003 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1005 return tca_action_flush(net, tb[1], n, portid);
1010 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1011 act = tcf_action_get_1(net, tb[i], n, portid);
1017 list_add_tail(&act->list, &actions);
1020 if (event == RTM_GETACTION)
1021 ret = tcf_get_notify(net, portid, n, &actions, event);
1023 ret = tcf_del_notify(net, n, &actions, portid);
1029 if (event != RTM_GETACTION)
1030 tcf_action_destroy(&actions, 0);
1035 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1038 struct sk_buff *skb;
1041 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1045 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1046 RTM_NEWACTION, 0, 0) <= 0) {
1051 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1052 n->nlmsg_flags & NLM_F_ECHO);
1058 static int tcf_action_add(struct net *net, struct nlattr *nla,
1059 struct nlmsghdr *n, u32 portid, int ovr)
1064 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions);
1068 return tcf_add_notify(net, n, &actions, portid);
1071 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1072 struct netlink_ext_ack *extack)
1074 struct net *net = sock_net(skb->sk);
1075 struct nlattr *tca[TCA_ACT_MAX + 1];
1076 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1077 int ret = 0, ovr = 0;
1079 if ((n->nlmsg_type != RTM_GETACTION) &&
1080 !netlink_capable(skb, CAP_NET_ADMIN))
1083 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL,
1088 if (tca[TCA_ACT_TAB] == NULL) {
1089 pr_notice("tc_ctl_action: received NO action attribs\n");
1093 /* n->nlmsg_flags & NLM_F_CREATE */
1094 switch (n->nlmsg_type) {
1096 /* we are going to assume all other flags
1097 * imply create only if it doesn't exist
1098 * Note that CREATE | EXCL implies that
1099 * but since we want avoid ambiguity (eg when flags
1100 * is zero) then just set this
1102 if (n->nlmsg_flags & NLM_F_REPLACE)
1105 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1110 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1111 portid, RTM_DELACTION);
1114 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1115 portid, RTM_GETACTION);
1124 static struct nlattr *find_dump_kind(const struct nlmsghdr *n)
1126 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1127 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1128 struct nlattr *nla[TCAA_MAX + 1];
1129 struct nlattr *kind;
1131 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX,
1134 tb1 = nla[TCA_ACT_TAB];
1138 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1139 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1144 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1146 kind = tb2[TCA_ACT_KIND];
1151 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1153 struct net *net = sock_net(skb->sk);
1154 struct nlmsghdr *nlh;
1155 unsigned char *b = skb_tail_pointer(skb);
1156 struct nlattr *nest;
1157 struct tc_action_ops *a_o;
1159 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1160 struct nlattr *kind = find_dump_kind(cb->nlh);
1163 pr_info("tc_dump_action: action bad kind\n");
1167 a_o = tc_lookup_action(kind);
1171 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1172 cb->nlh->nlmsg_type, sizeof(*t), 0);
1174 goto out_module_put;
1175 t = nlmsg_data(nlh);
1176 t->tca_family = AF_UNSPEC;
1180 nest = nla_nest_start(skb, TCA_ACT_TAB);
1182 goto out_module_put;
1184 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1186 goto out_module_put;
1189 nla_nest_end(skb, nest);
1194 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1195 if (NETLINK_CB(cb->skb).portid && ret)
1196 nlh->nlmsg_flags |= NLM_F_MULTI;
1197 module_put(a_o->owner);
1201 module_put(a_o->owner);
1206 static int __init tc_action_init(void)
1208 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1209 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1210 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1216 subsys_initcall(tc_action_init);