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 <linux/rhashtable.h>
25 #include <linux/list.h>
26 #include <net/net_namespace.h>
28 #include <net/sch_generic.h>
29 #include <net/pkt_cls.h>
30 #include <net/act_api.h>
31 #include <net/netlink.h>
33 static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
35 u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
39 a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
45 static void tcf_action_goto_chain_fini(struct tc_action *a)
47 tcf_chain_put(a->goto_chain);
50 static void tcf_action_goto_chain_exec(const struct tc_action *a,
51 struct tcf_result *res)
53 const struct tcf_chain *chain = a->goto_chain;
55 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
58 /* XXX: For standalone actions, we don't need a RCU grace period either, because
59 * actions are always connected to filters and filters are already destroyed in
60 * RCU callbacks, so after a RCU grace period actions are already disconnected
61 * from filters. Readers later can not find us.
63 static void free_tcf(struct tc_action *p)
65 free_percpu(p->cpu_bstats);
66 free_percpu(p->cpu_qstats);
69 kfree(p->act_cookie->data);
73 tcf_action_goto_chain_fini(p);
78 static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
80 spin_lock_bh(&idrinfo->lock);
81 idr_remove_ext(&idrinfo->action_idr, p->tcfa_index);
82 spin_unlock_bh(&idrinfo->lock);
83 gen_kill_estimator(&p->tcfa_rate_est);
87 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
96 else if (strict && p->tcfa_bindcnt > 0)
100 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
102 p->ops->cleanup(p, bind);
103 tcf_idr_remove(p->idrinfo, p);
110 EXPORT_SYMBOL(__tcf_idr_release);
112 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
113 struct netlink_callback *cb)
115 int err = 0, index = -1, s_i = 0, n_i = 0;
116 u32 act_flags = cb->args[2];
117 unsigned long jiffy_since = cb->args[3];
119 struct idr *idr = &idrinfo->action_idr;
121 unsigned long id = 1;
123 spin_lock_bh(&idrinfo->lock);
127 idr_for_each_entry_ext(idr, p, id) {
133 time_after(jiffy_since,
134 (unsigned long)p->tcfa_tm.lastuse))
137 nest = nla_nest_start(skb, n_i);
139 goto nla_put_failure;
140 err = tcf_action_dump_1(skb, p, 0, 0);
143 nlmsg_trim(skb, nest);
146 nla_nest_end(skb, nest);
148 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
149 n_i >= TCA_ACT_MAX_PRIO)
154 cb->args[0] = index + 1;
156 spin_unlock_bh(&idrinfo->lock);
158 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
164 nla_nest_cancel(skb, nest);
168 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
169 const struct tc_action_ops *ops)
174 struct idr *idr = &idrinfo->action_idr;
176 unsigned long id = 1;
178 nest = nla_nest_start(skb, 0);
180 goto nla_put_failure;
181 if (nla_put_string(skb, TCA_KIND, ops->kind))
182 goto nla_put_failure;
184 idr_for_each_entry_ext(idr, p, id) {
185 ret = __tcf_idr_release(p, false, true);
186 if (ret == ACT_P_DELETED) {
187 module_put(ops->owner);
189 } else if (ret < 0) {
190 goto nla_put_failure;
193 if (nla_put_u32(skb, TCA_FCNT, n_i))
194 goto nla_put_failure;
195 nla_nest_end(skb, nest);
199 nla_nest_cancel(skb, nest);
203 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
204 struct netlink_callback *cb, int type,
205 const struct tc_action_ops *ops)
207 struct tcf_idrinfo *idrinfo = tn->idrinfo;
209 if (type == RTM_DELACTION) {
210 return tcf_del_walker(idrinfo, skb, ops);
211 } else if (type == RTM_GETACTION) {
212 return tcf_dump_walker(idrinfo, skb, cb);
214 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
218 EXPORT_SYMBOL(tcf_generic_walker);
220 static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
222 struct tc_action *p = NULL;
224 spin_lock_bh(&idrinfo->lock);
225 p = idr_find_ext(&idrinfo->action_idr, index);
226 spin_unlock_bh(&idrinfo->lock);
231 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
233 struct tcf_idrinfo *idrinfo = tn->idrinfo;
234 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
242 EXPORT_SYMBOL(tcf_idr_search);
244 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
247 struct tcf_idrinfo *idrinfo = tn->idrinfo;
248 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
259 EXPORT_SYMBOL(tcf_idr_check);
261 void tcf_idr_cleanup(struct tc_action *a, struct nlattr *est)
264 gen_kill_estimator(&a->tcfa_rate_est);
267 EXPORT_SYMBOL(tcf_idr_cleanup);
269 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
270 struct tc_action **a, const struct tc_action_ops *ops,
271 int bind, bool cpustats)
273 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
274 struct tcf_idrinfo *idrinfo = tn->idrinfo;
275 struct idr *idr = &idrinfo->action_idr;
277 unsigned long idr_index;
286 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
287 if (!p->cpu_bstats) {
292 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
293 if (!p->cpu_qstats) {
295 free_percpu(p->cpu_bstats);
299 spin_lock_init(&p->tcfa_lock);
300 /* user doesn't specify an index */
302 idr_preload(GFP_KERNEL);
303 spin_lock_bh(&idrinfo->lock);
304 err = idr_alloc_ext(idr, NULL, &idr_index, 1, 0,
306 spin_unlock_bh(&idrinfo->lock);
310 free_percpu(p->cpu_qstats);
313 p->tcfa_index = idr_index;
315 idr_preload(GFP_KERNEL);
316 spin_lock_bh(&idrinfo->lock);
317 err = idr_alloc_ext(idr, NULL, NULL, index, index + 1,
319 spin_unlock_bh(&idrinfo->lock);
323 p->tcfa_index = index;
326 p->tcfa_tm.install = jiffies;
327 p->tcfa_tm.lastuse = jiffies;
328 p->tcfa_tm.firstuse = 0;
330 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
332 &p->tcfa_lock, NULL, est);
338 p->idrinfo = idrinfo;
340 INIT_LIST_HEAD(&p->list);
344 EXPORT_SYMBOL(tcf_idr_create);
346 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
348 struct tcf_idrinfo *idrinfo = tn->idrinfo;
350 spin_lock_bh(&idrinfo->lock);
351 idr_replace_ext(&idrinfo->action_idr, a, a->tcfa_index);
352 spin_unlock_bh(&idrinfo->lock);
354 EXPORT_SYMBOL(tcf_idr_insert);
356 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
357 struct tcf_idrinfo *idrinfo)
359 struct idr *idr = &idrinfo->action_idr;
362 unsigned long id = 1;
364 idr_for_each_entry_ext(idr, p, id) {
365 ret = __tcf_idr_release(p, false, true);
366 if (ret == ACT_P_DELETED)
367 module_put(ops->owner);
371 idr_destroy(&idrinfo->action_idr);
373 EXPORT_SYMBOL(tcf_idrinfo_destroy);
375 static LIST_HEAD(act_base);
376 static DEFINE_RWLOCK(act_mod_lock);
378 int tcf_register_action(struct tc_action_ops *act,
379 struct pernet_operations *ops)
381 struct tc_action_ops *a;
384 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
387 /* We have to register pernet ops before making the action ops visible,
388 * otherwise tcf_action_init_1() could get a partially initialized
391 ret = register_pernet_subsys(ops);
395 write_lock(&act_mod_lock);
396 list_for_each_entry(a, &act_base, head) {
397 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
398 write_unlock(&act_mod_lock);
399 unregister_pernet_subsys(ops);
403 list_add_tail(&act->head, &act_base);
404 write_unlock(&act_mod_lock);
408 EXPORT_SYMBOL(tcf_register_action);
410 int tcf_unregister_action(struct tc_action_ops *act,
411 struct pernet_operations *ops)
413 struct tc_action_ops *a;
416 write_lock(&act_mod_lock);
417 list_for_each_entry(a, &act_base, head) {
419 list_del(&act->head);
424 write_unlock(&act_mod_lock);
426 unregister_pernet_subsys(ops);
429 EXPORT_SYMBOL(tcf_unregister_action);
432 static struct tc_action_ops *tc_lookup_action_n(char *kind)
434 struct tc_action_ops *a, *res = NULL;
437 read_lock(&act_mod_lock);
438 list_for_each_entry(a, &act_base, head) {
439 if (strcmp(kind, a->kind) == 0) {
440 if (try_module_get(a->owner))
445 read_unlock(&act_mod_lock);
450 /* lookup by nlattr */
451 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
453 struct tc_action_ops *a, *res = NULL;
456 read_lock(&act_mod_lock);
457 list_for_each_entry(a, &act_base, head) {
458 if (nla_strcmp(kind, a->kind) == 0) {
459 if (try_module_get(a->owner))
464 read_unlock(&act_mod_lock);
469 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
470 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
471 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
472 int nr_actions, struct tcf_result *res)
475 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
479 if (skb_skip_tc_classify(skb))
483 for (i = 0; i < nr_actions; i++) {
484 const struct tc_action *a = actions[i];
486 if (jmp_prgcnt > 0) {
491 ret = a->ops->act(skb, a, res);
492 if (ret == TC_ACT_REPEAT)
493 goto repeat; /* we need a ttl - JHS */
495 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
496 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
497 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
498 /* faulty opcode, stop pipeline */
503 goto restart_act_graph;
504 else /* faulty graph, stop pipeline */
507 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
508 tcf_action_goto_chain_exec(a, res);
511 if (ret != TC_ACT_PIPE)
517 EXPORT_SYMBOL(tcf_action_exec);
519 int tcf_action_destroy(struct list_head *actions, int bind)
521 const struct tc_action_ops *ops;
522 struct tc_action *a, *tmp;
525 list_for_each_entry_safe(a, tmp, actions, list) {
527 ret = __tcf_idr_release(a, bind, true);
528 if (ret == ACT_P_DELETED)
529 module_put(ops->owner);
537 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
539 return a->ops->dump(skb, a, bind, ref);
543 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
546 unsigned char *b = skb_tail_pointer(skb);
549 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
550 goto nla_put_failure;
551 if (tcf_action_copy_stats(skb, a, 0))
552 goto nla_put_failure;
554 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
555 a->act_cookie->data))
556 goto nla_put_failure;
559 nest = nla_nest_start(skb, TCA_OPTIONS);
561 goto nla_put_failure;
562 err = tcf_action_dump_old(skb, a, bind, ref);
564 nla_nest_end(skb, nest);
572 EXPORT_SYMBOL(tcf_action_dump_1);
574 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
581 list_for_each_entry(a, actions, list) {
582 nest = nla_nest_start(skb, a->order);
584 goto nla_put_failure;
585 err = tcf_action_dump_1(skb, a, bind, ref);
588 nla_nest_end(skb, nest);
596 nla_nest_cancel(skb, nest);
600 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
602 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
606 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
611 c->len = nla_len(tb[TCA_ACT_COOKIE]);
616 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
617 struct nlattr *nla, struct nlattr *est,
618 char *name, int ovr, int bind)
621 struct tc_action_ops *a_o;
622 struct tc_cookie *cookie = NULL;
623 char act_name[IFNAMSIZ];
624 struct nlattr *tb[TCA_ACT_MAX + 1];
629 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
633 kind = tb[TCA_ACT_KIND];
636 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
638 if (tb[TCA_ACT_COOKIE]) {
639 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
641 if (cklen > TC_COOKIE_MAX_SIZE)
644 cookie = nla_memdup_cookie(tb);
652 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
656 a_o = tc_lookup_action_n(act_name);
658 #ifdef CONFIG_MODULES
660 request_module("act_%s", act_name);
663 a_o = tc_lookup_action_n(act_name);
665 /* We dropped the RTNL semaphore in order to
666 * perform the module load. So, even if we
667 * succeeded in loading the module we have to
668 * tell the caller to replay the request. We
669 * indicate this using -EAGAIN.
680 /* backward compatibility for policer */
682 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
684 err = a_o->init(net, nla, est, &a, ovr, bind);
688 if (name == NULL && tb[TCA_ACT_COOKIE]) {
690 kfree(a->act_cookie->data);
691 kfree(a->act_cookie);
693 a->act_cookie = cookie;
696 /* module count goes up only when brand new policy is created
697 * if it exists and is only bound to in a_o->init() then
698 * ACT_P_CREATED is not returned (a zero is).
700 if (err != ACT_P_CREATED)
701 module_put(a_o->owner);
703 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
704 err = tcf_action_goto_chain_init(a, tp);
708 list_add_tail(&a->list, &actions);
709 tcf_action_destroy(&actions, bind);
717 module_put(a_o->owner);
726 static void cleanup_a(struct list_head *actions, int ovr)
733 list_for_each_entry(a, actions, list)
737 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
738 struct nlattr *est, char *name, int ovr, int bind,
739 struct list_head *actions)
741 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
742 struct tc_action *act;
746 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
750 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
751 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind);
759 list_add_tail(&act->list, actions);
762 /* Remove the temp refcnt which was necessary to protect against
763 * destroying an existing action which was being replaced
765 cleanup_a(actions, ovr);
769 tcf_action_destroy(actions, bind);
773 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
782 /* compat_mode being true specifies a call that is supposed
783 * to add additional backward compatibility statistic TLVs.
786 if (p->type == TCA_OLD_COMPAT)
787 err = gnet_stats_start_copy_compat(skb, 0,
795 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
796 &p->tcfa_lock, &d, TCA_ACT_PAD);
801 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
802 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
803 gnet_stats_copy_queue(&d, p->cpu_qstats,
805 p->tcfa_qstats.qlen) < 0)
808 if (gnet_stats_finish_copy(&d) < 0)
817 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
818 u32 portid, u32 seq, u16 flags, int event, int bind,
822 struct nlmsghdr *nlh;
823 unsigned char *b = skb_tail_pointer(skb);
826 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
830 t->tca_family = AF_UNSPEC;
834 nest = nla_nest_start(skb, TCA_ACT_TAB);
838 if (tcf_action_dump(skb, actions, bind, ref) < 0)
841 nla_nest_end(skb, nest);
843 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
852 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
853 struct list_head *actions, int event)
857 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
860 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
866 return rtnl_unicast(skb, net, portid);
869 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
870 struct nlmsghdr *n, u32 portid)
872 struct nlattr *tb[TCA_ACT_MAX + 1];
873 const struct tc_action_ops *ops;
878 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
883 if (tb[TCA_ACT_INDEX] == NULL ||
884 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
886 index = nla_get_u32(tb[TCA_ACT_INDEX]);
889 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
890 if (!ops) /* could happen in batch of actions */
893 if (ops->lookup(net, &a, index) == 0)
896 module_put(ops->owner);
900 module_put(ops->owner);
905 static int tca_action_flush(struct net *net, struct nlattr *nla,
906 struct nlmsghdr *n, u32 portid)
910 struct nlmsghdr *nlh;
912 struct netlink_callback dcb;
914 struct nlattr *tb[TCA_ACT_MAX + 1];
915 const struct tc_action_ops *ops;
919 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
921 pr_debug("tca_action_flush: failed skb alloc\n");
925 b = skb_tail_pointer(skb);
927 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
932 kind = tb[TCA_ACT_KIND];
933 ops = tc_lookup_action(kind);
934 if (!ops) /*some idjot trying to flush unknown action */
937 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
942 t->tca_family = AF_UNSPEC;
946 nest = nla_nest_start(skb, TCA_ACT_TAB);
950 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
954 nla_nest_end(skb, nest);
956 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
957 nlh->nlmsg_flags |= NLM_F_ROOT;
958 module_put(ops->owner);
959 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
960 n->nlmsg_flags & NLM_F_ECHO);
967 module_put(ops->owner);
974 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
980 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
984 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
990 /* now do the delete */
991 ret = tcf_action_destroy(actions, 0);
997 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
998 n->nlmsg_flags & NLM_F_ECHO);
1005 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1006 u32 portid, int event)
1009 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1010 struct tc_action *act;
1013 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
1017 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1019 return tca_action_flush(net, tb[1], n, portid);
1024 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1025 act = tcf_action_get_1(net, tb[i], n, portid);
1031 list_add_tail(&act->list, &actions);
1034 if (event == RTM_GETACTION)
1035 ret = tcf_get_notify(net, portid, n, &actions, event);
1037 ret = tcf_del_notify(net, n, &actions, portid);
1043 if (event != RTM_GETACTION)
1044 tcf_action_destroy(&actions, 0);
1049 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1052 struct sk_buff *skb;
1055 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1059 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1060 RTM_NEWACTION, 0, 0) <= 0) {
1065 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1066 n->nlmsg_flags & NLM_F_ECHO);
1072 static int tcf_action_add(struct net *net, struct nlattr *nla,
1073 struct nlmsghdr *n, u32 portid, int ovr)
1078 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions);
1082 return tcf_add_notify(net, n, &actions, portid);
1085 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1086 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1087 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1088 .validation_data = &tcaa_root_flags_allowed },
1089 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1092 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1093 struct netlink_ext_ack *extack)
1095 struct net *net = sock_net(skb->sk);
1096 struct nlattr *tca[TCA_ROOT_MAX + 1];
1097 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1098 int ret = 0, ovr = 0;
1100 if ((n->nlmsg_type != RTM_GETACTION) &&
1101 !netlink_capable(skb, CAP_NET_ADMIN))
1104 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1109 if (tca[TCA_ACT_TAB] == NULL) {
1110 pr_notice("tc_ctl_action: received NO action attribs\n");
1114 /* n->nlmsg_flags & NLM_F_CREATE */
1115 switch (n->nlmsg_type) {
1117 /* we are going to assume all other flags
1118 * imply create only if it doesn't exist
1119 * Note that CREATE | EXCL implies that
1120 * but since we want avoid ambiguity (eg when flags
1121 * is zero) then just set this
1123 if (n->nlmsg_flags & NLM_F_REPLACE)
1126 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1131 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1132 portid, RTM_DELACTION);
1135 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1136 portid, RTM_GETACTION);
1145 static struct nlattr *find_dump_kind(struct nlattr **nla)
1147 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1148 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1149 struct nlattr *kind;
1151 tb1 = nla[TCA_ACT_TAB];
1155 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1156 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1161 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1163 kind = tb2[TCA_ACT_KIND];
1168 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1170 struct net *net = sock_net(skb->sk);
1171 struct nlmsghdr *nlh;
1172 unsigned char *b = skb_tail_pointer(skb);
1173 struct nlattr *nest;
1174 struct tc_action_ops *a_o;
1176 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1177 struct nlattr *tb[TCA_ROOT_MAX + 1];
1178 struct nlattr *count_attr = NULL;
1179 unsigned long jiffy_since = 0;
1180 struct nlattr *kind = NULL;
1181 struct nla_bitfield32 bf;
1182 u32 msecs_since = 0;
1185 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1190 kind = find_dump_kind(tb);
1192 pr_info("tc_dump_action: action bad kind\n");
1196 a_o = tc_lookup_action(kind);
1201 if (tb[TCA_ROOT_FLAGS]) {
1202 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1203 cb->args[2] = bf.value;
1206 if (tb[TCA_ROOT_TIME_DELTA]) {
1207 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1210 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1211 cb->nlh->nlmsg_type, sizeof(*t), 0);
1213 goto out_module_put;
1216 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1218 t = nlmsg_data(nlh);
1219 t->tca_family = AF_UNSPEC;
1222 cb->args[3] = jiffy_since;
1223 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1225 goto out_module_put;
1227 nest = nla_nest_start(skb, TCA_ACT_TAB);
1229 goto out_module_put;
1231 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1233 goto out_module_put;
1236 nla_nest_end(skb, nest);
1238 act_count = cb->args[1];
1239 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1244 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1245 if (NETLINK_CB(cb->skb).portid && ret)
1246 nlh->nlmsg_flags |= NLM_F_MULTI;
1247 module_put(a_o->owner);
1251 module_put(a_o->owner);
1256 struct tcf_action_net {
1257 struct rhashtable egdev_ht;
1260 static unsigned int tcf_action_net_id;
1262 struct tcf_action_egdev_cb {
1263 struct list_head list;
1268 struct tcf_action_egdev {
1269 struct rhash_head ht_node;
1270 const struct net_device *dev;
1271 unsigned int refcnt;
1272 struct list_head cb_list;
1275 static const struct rhashtable_params tcf_action_egdev_ht_params = {
1276 .key_offset = offsetof(struct tcf_action_egdev, dev),
1277 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1278 .key_len = sizeof(const struct net_device *),
1281 static struct tcf_action_egdev *
1282 tcf_action_egdev_lookup(const struct net_device *dev)
1284 struct net *net = dev_net(dev);
1285 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1287 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1288 tcf_action_egdev_ht_params);
1291 static struct tcf_action_egdev *
1292 tcf_action_egdev_get(const struct net_device *dev)
1294 struct tcf_action_egdev *egdev;
1295 struct tcf_action_net *tan;
1297 egdev = tcf_action_egdev_lookup(dev);
1301 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1304 INIT_LIST_HEAD(&egdev->cb_list);
1306 tan = net_generic(dev_net(dev), tcf_action_net_id);
1307 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1308 tcf_action_egdev_ht_params);
1315 static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1317 struct tcf_action_net *tan;
1319 if (--egdev->refcnt)
1321 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1322 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1323 tcf_action_egdev_ht_params);
1327 static struct tcf_action_egdev_cb *
1328 tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1329 tc_setup_cb_t *cb, void *cb_priv)
1331 struct tcf_action_egdev_cb *egdev_cb;
1333 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1334 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1339 static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1340 enum tc_setup_type type,
1341 void *type_data, bool err_stop)
1343 struct tcf_action_egdev_cb *egdev_cb;
1347 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1348 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1359 static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1360 tc_setup_cb_t *cb, void *cb_priv)
1362 struct tcf_action_egdev_cb *egdev_cb;
1364 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1365 if (WARN_ON(egdev_cb))
1367 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1371 egdev_cb->cb_priv = cb_priv;
1372 list_add(&egdev_cb->list, &egdev->cb_list);
1376 static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1377 tc_setup_cb_t *cb, void *cb_priv)
1379 struct tcf_action_egdev_cb *egdev_cb;
1381 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1382 if (WARN_ON(!egdev_cb))
1384 list_del(&egdev_cb->list);
1388 static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1389 tc_setup_cb_t *cb, void *cb_priv)
1391 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1396 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1402 tcf_action_egdev_put(egdev);
1405 int tc_setup_cb_egdev_register(const struct net_device *dev,
1406 tc_setup_cb_t *cb, void *cb_priv)
1411 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1415 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1417 static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1418 tc_setup_cb_t *cb, void *cb_priv)
1420 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1422 if (WARN_ON(!egdev))
1424 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1425 tcf_action_egdev_put(egdev);
1427 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1428 tc_setup_cb_t *cb, void *cb_priv)
1431 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1434 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1436 int tc_setup_cb_egdev_call(const struct net_device *dev,
1437 enum tc_setup_type type, void *type_data,
1440 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1444 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1446 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1448 static __net_init int tcf_action_net_init(struct net *net)
1450 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1452 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1455 static void __net_exit tcf_action_net_exit(struct net *net)
1457 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1459 rhashtable_destroy(&tan->egdev_ht);
1462 static struct pernet_operations tcf_action_net_ops = {
1463 .init = tcf_action_net_init,
1464 .exit = tcf_action_net_exit,
1465 .id = &tcf_action_net_id,
1466 .size = sizeof(struct tcf_action_net),
1469 static int __init tc_action_init(void)
1473 err = register_pernet_subsys(&tcf_action_net_ops);
1477 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1478 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1479 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1485 subsys_initcall(tc_action_init);