1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net/sched/act_api.c Packet action API.
5 * Author: Jamal Hadi Salim
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/skbuff.h>
14 #include <linux/init.h>
15 #include <linux/kmod.h>
16 #include <linux/err.h>
17 #include <linux/module.h>
18 #include <net/net_namespace.h>
20 #include <net/sch_generic.h>
21 #include <net/pkt_cls.h>
22 #include <net/act_api.h>
23 #include <net/netlink.h>
25 static void tcf_action_goto_chain_exec(const struct tc_action *a,
26 struct tcf_result *res)
28 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
30 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
33 static void tcf_free_cookie_rcu(struct rcu_head *p)
35 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
41 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
42 struct tc_cookie *new_cookie)
44 struct tc_cookie *old;
46 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
48 call_rcu(&old->rcu, tcf_free_cookie_rcu);
51 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
52 struct tcf_chain **newchain,
53 struct netlink_ext_ack *extack)
55 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
59 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
60 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
63 NL_SET_ERR_MSG(extack, "invalid control action");
67 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
68 chain_index = action & TC_ACT_EXT_VAL_MASK;
69 if (!tp || !newchain) {
71 NL_SET_ERR_MSG(extack,
72 "can't goto NULL proto/chain");
75 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
78 NL_SET_ERR_MSG(extack,
79 "can't allocate goto_chain");
85 EXPORT_SYMBOL(tcf_action_check_ctrlact);
87 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
88 struct tcf_chain *goto_chain)
90 a->tcfa_action = action;
91 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
94 EXPORT_SYMBOL(tcf_action_set_ctrlact);
96 /* XXX: For standalone actions, we don't need a RCU grace period either, because
97 * actions are always connected to filters and filters are already destroyed in
98 * RCU callbacks, so after a RCU grace period actions are already disconnected
99 * from filters. Readers later can not find us.
101 static void free_tcf(struct tc_action *p)
103 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
105 free_percpu(p->cpu_bstats);
106 free_percpu(p->cpu_bstats_hw);
107 free_percpu(p->cpu_qstats);
109 tcf_set_action_cookie(&p->act_cookie, NULL);
111 tcf_chain_put_by_act(chain);
116 static void tcf_action_cleanup(struct tc_action *p)
121 gen_kill_estimator(&p->tcfa_rate_est);
125 static int __tcf_action_put(struct tc_action *p, bool bind)
127 struct tcf_idrinfo *idrinfo = p->idrinfo;
129 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
131 atomic_dec(&p->tcfa_bindcnt);
132 idr_remove(&idrinfo->action_idr, p->tcfa_index);
133 mutex_unlock(&idrinfo->lock);
135 tcf_action_cleanup(p);
140 atomic_dec(&p->tcfa_bindcnt);
145 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
149 /* Release with strict==1 and bind==0 is only called through act API
150 * interface (classifiers always bind). Only case when action with
151 * positive reference count and zero bind count can exist is when it was
152 * also created with act API (unbinding last classifier will destroy the
153 * action if it was created by classifier). So only case when bind count
154 * can be changed after initial check is when unbound action is
155 * destroyed by act API while classifier binds to action with same id
156 * concurrently. This result either creation of new action(same behavior
157 * as before), or reusing existing action if concurrent process
158 * increments reference count before action is deleted. Both scenarios
162 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
165 if (__tcf_action_put(p, bind))
171 EXPORT_SYMBOL(__tcf_idr_release);
173 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
175 struct tc_cookie *act_cookie;
179 act_cookie = rcu_dereference(act->act_cookie);
182 cookie_len = nla_total_size(act_cookie->len);
185 return nla_total_size(0) /* action number nested */
186 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
187 + cookie_len /* TCA_ACT_COOKIE */
188 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
189 + nla_total_size(0) /* TCA_ACT_STATS nested */
190 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
191 /* TCA_STATS_BASIC */
192 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
193 /* TCA_STATS_PKT64 */
194 + nla_total_size_64bit(sizeof(u64))
195 /* TCA_STATS_QUEUE */
196 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
197 + nla_total_size(0) /* TCA_OPTIONS nested */
198 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
201 static size_t tcf_action_full_attrs_size(size_t sz)
203 return NLMSG_HDRLEN /* struct nlmsghdr */
204 + sizeof(struct tcamsg)
205 + nla_total_size(0) /* TCA_ACT_TAB nested */
209 static size_t tcf_action_fill_size(const struct tc_action *act)
211 size_t sz = tcf_action_shared_attrs_size(act);
213 if (act->ops->get_fill_size)
214 return act->ops->get_fill_size(act) + sz;
218 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
219 struct netlink_callback *cb)
221 int err = 0, index = -1, s_i = 0, n_i = 0;
222 u32 act_flags = cb->args[2];
223 unsigned long jiffy_since = cb->args[3];
225 struct idr *idr = &idrinfo->action_idr;
227 unsigned long id = 1;
230 mutex_lock(&idrinfo->lock);
234 idr_for_each_entry_ul(idr, p, tmp, id) {
240 time_after(jiffy_since,
241 (unsigned long)p->tcfa_tm.lastuse))
244 nest = nla_nest_start_noflag(skb, n_i);
247 goto nla_put_failure;
249 err = tcf_action_dump_1(skb, p, 0, 0);
252 nlmsg_trim(skb, nest);
255 nla_nest_end(skb, nest);
257 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
258 n_i >= TCA_ACT_MAX_PRIO)
263 cb->args[0] = index + 1;
265 mutex_unlock(&idrinfo->lock);
267 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
273 nla_nest_cancel(skb, nest);
277 static int tcf_idr_release_unsafe(struct tc_action *p)
279 if (atomic_read(&p->tcfa_bindcnt) > 0)
282 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
283 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
284 tcf_action_cleanup(p);
285 return ACT_P_DELETED;
291 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
292 const struct tc_action_ops *ops)
297 struct idr *idr = &idrinfo->action_idr;
299 unsigned long id = 1;
302 nest = nla_nest_start_noflag(skb, 0);
304 goto nla_put_failure;
305 if (nla_put_string(skb, TCA_KIND, ops->kind))
306 goto nla_put_failure;
308 mutex_lock(&idrinfo->lock);
309 idr_for_each_entry_ul(idr, p, tmp, id) {
310 ret = tcf_idr_release_unsafe(p);
311 if (ret == ACT_P_DELETED) {
312 module_put(ops->owner);
314 } else if (ret < 0) {
315 mutex_unlock(&idrinfo->lock);
316 goto nla_put_failure;
319 mutex_unlock(&idrinfo->lock);
321 if (nla_put_u32(skb, TCA_FCNT, n_i))
322 goto nla_put_failure;
323 nla_nest_end(skb, nest);
327 nla_nest_cancel(skb, nest);
331 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
332 struct netlink_callback *cb, int type,
333 const struct tc_action_ops *ops,
334 struct netlink_ext_ack *extack)
336 struct tcf_idrinfo *idrinfo = tn->idrinfo;
338 if (type == RTM_DELACTION) {
339 return tcf_del_walker(idrinfo, skb, ops);
340 } else if (type == RTM_GETACTION) {
341 return tcf_dump_walker(idrinfo, skb, cb);
343 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
344 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
348 EXPORT_SYMBOL(tcf_generic_walker);
350 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
352 struct tcf_idrinfo *idrinfo = tn->idrinfo;
355 mutex_lock(&idrinfo->lock);
356 p = idr_find(&idrinfo->action_idr, index);
360 refcount_inc(&p->tcfa_refcnt);
361 mutex_unlock(&idrinfo->lock);
369 EXPORT_SYMBOL(tcf_idr_search);
371 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
376 mutex_lock(&idrinfo->lock);
377 p = idr_find(&idrinfo->action_idr, index);
379 mutex_unlock(&idrinfo->lock);
383 if (!atomic_read(&p->tcfa_bindcnt)) {
384 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
385 struct module *owner = p->ops->owner;
387 WARN_ON(p != idr_remove(&idrinfo->action_idr,
389 mutex_unlock(&idrinfo->lock);
391 tcf_action_cleanup(p);
400 mutex_unlock(&idrinfo->lock);
404 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
405 struct tc_action **a, const struct tc_action_ops *ops,
406 int bind, bool cpustats, u32 flags)
408 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
409 struct tcf_idrinfo *idrinfo = tn->idrinfo;
414 refcount_set(&p->tcfa_refcnt, 1);
416 atomic_set(&p->tcfa_bindcnt, 1);
419 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
422 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
423 if (!p->cpu_bstats_hw)
425 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
429 spin_lock_init(&p->tcfa_lock);
430 p->tcfa_index = index;
431 p->tcfa_tm.install = jiffies;
432 p->tcfa_tm.lastuse = jiffies;
433 p->tcfa_tm.firstuse = 0;
434 p->tcfa_flags = flags;
436 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
438 &p->tcfa_lock, NULL, est);
443 p->idrinfo = idrinfo;
448 free_percpu(p->cpu_qstats);
450 free_percpu(p->cpu_bstats_hw);
452 free_percpu(p->cpu_bstats);
457 EXPORT_SYMBOL(tcf_idr_create);
459 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
460 struct nlattr *est, struct tc_action **a,
461 const struct tc_action_ops *ops, int bind,
464 /* Set cpustats according to actions flags. */
465 return tcf_idr_create(tn, index, est, a, ops, bind,
466 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
468 EXPORT_SYMBOL(tcf_idr_create_from_flags);
470 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
472 struct tcf_idrinfo *idrinfo = tn->idrinfo;
474 mutex_lock(&idrinfo->lock);
475 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
476 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
477 mutex_unlock(&idrinfo->lock);
479 EXPORT_SYMBOL(tcf_idr_insert);
481 /* Cleanup idr index that was allocated but not initialized. */
483 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
485 struct tcf_idrinfo *idrinfo = tn->idrinfo;
487 mutex_lock(&idrinfo->lock);
488 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
489 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
490 mutex_unlock(&idrinfo->lock);
492 EXPORT_SYMBOL(tcf_idr_cleanup);
494 /* Check if action with specified index exists. If actions is found, increments
495 * its reference and bind counters, and return 1. Otherwise insert temporary
496 * error pointer (to prevent concurrent users from inserting actions with same
497 * index) and return 0.
500 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
501 struct tc_action **a, int bind)
503 struct tcf_idrinfo *idrinfo = tn->idrinfo;
508 mutex_lock(&idrinfo->lock);
510 p = idr_find(&idrinfo->action_idr, *index);
512 /* This means that another process allocated
513 * index but did not assign the pointer yet.
515 mutex_unlock(&idrinfo->lock);
520 refcount_inc(&p->tcfa_refcnt);
522 atomic_inc(&p->tcfa_bindcnt);
527 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
530 idr_replace(&idrinfo->action_idr,
531 ERR_PTR(-EBUSY), *index);
536 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
537 UINT_MAX, GFP_KERNEL);
539 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
542 mutex_unlock(&idrinfo->lock);
545 EXPORT_SYMBOL(tcf_idr_check_alloc);
547 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
548 struct tcf_idrinfo *idrinfo)
550 struct idr *idr = &idrinfo->action_idr;
553 unsigned long id = 1;
556 idr_for_each_entry_ul(idr, p, tmp, id) {
557 ret = __tcf_idr_release(p, false, true);
558 if (ret == ACT_P_DELETED)
559 module_put(ops->owner);
563 idr_destroy(&idrinfo->action_idr);
565 EXPORT_SYMBOL(tcf_idrinfo_destroy);
567 static LIST_HEAD(act_base);
568 static DEFINE_RWLOCK(act_mod_lock);
570 int tcf_register_action(struct tc_action_ops *act,
571 struct pernet_operations *ops)
573 struct tc_action_ops *a;
576 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
579 /* We have to register pernet ops before making the action ops visible,
580 * otherwise tcf_action_init_1() could get a partially initialized
583 ret = register_pernet_subsys(ops);
587 write_lock(&act_mod_lock);
588 list_for_each_entry(a, &act_base, head) {
589 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
590 write_unlock(&act_mod_lock);
591 unregister_pernet_subsys(ops);
595 list_add_tail(&act->head, &act_base);
596 write_unlock(&act_mod_lock);
600 EXPORT_SYMBOL(tcf_register_action);
602 int tcf_unregister_action(struct tc_action_ops *act,
603 struct pernet_operations *ops)
605 struct tc_action_ops *a;
608 write_lock(&act_mod_lock);
609 list_for_each_entry(a, &act_base, head) {
611 list_del(&act->head);
616 write_unlock(&act_mod_lock);
618 unregister_pernet_subsys(ops);
621 EXPORT_SYMBOL(tcf_unregister_action);
624 static struct tc_action_ops *tc_lookup_action_n(char *kind)
626 struct tc_action_ops *a, *res = NULL;
629 read_lock(&act_mod_lock);
630 list_for_each_entry(a, &act_base, head) {
631 if (strcmp(kind, a->kind) == 0) {
632 if (try_module_get(a->owner))
637 read_unlock(&act_mod_lock);
642 /* lookup by nlattr */
643 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
645 struct tc_action_ops *a, *res = NULL;
648 read_lock(&act_mod_lock);
649 list_for_each_entry(a, &act_base, head) {
650 if (nla_strcmp(kind, a->kind) == 0) {
651 if (try_module_get(a->owner))
656 read_unlock(&act_mod_lock);
661 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
662 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
663 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
664 int nr_actions, struct tcf_result *res)
667 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
671 if (skb_skip_tc_classify(skb))
675 for (i = 0; i < nr_actions; i++) {
676 const struct tc_action *a = actions[i];
678 if (jmp_prgcnt > 0) {
683 ret = a->ops->act(skb, a, res);
684 if (ret == TC_ACT_REPEAT)
685 goto repeat; /* we need a ttl - JHS */
687 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
688 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
689 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
690 /* faulty opcode, stop pipeline */
695 goto restart_act_graph;
696 else /* faulty graph, stop pipeline */
699 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
700 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
701 net_warn_ratelimited("can't go to NULL chain!\n");
704 tcf_action_goto_chain_exec(a, res);
707 if (ret != TC_ACT_PIPE)
713 EXPORT_SYMBOL(tcf_action_exec);
715 int tcf_action_destroy(struct tc_action *actions[], int bind)
717 const struct tc_action_ops *ops;
721 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
725 ret = __tcf_idr_release(a, bind, true);
726 if (ret == ACT_P_DELETED)
727 module_put(ops->owner);
734 static int tcf_action_destroy_1(struct tc_action *a, int bind)
736 struct tc_action *actions[] = { a, NULL };
738 return tcf_action_destroy(actions, bind);
741 static int tcf_action_put(struct tc_action *p)
743 return __tcf_action_put(p, false);
746 /* Put all actions in this array, skip those NULL's. */
747 static void tcf_action_put_many(struct tc_action *actions[])
751 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
752 struct tc_action *a = actions[i];
753 const struct tc_action_ops *ops;
758 if (tcf_action_put(a))
759 module_put(ops->owner);
764 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
766 return a->ops->dump(skb, a, bind, ref);
770 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a)
772 unsigned char *b = skb_tail_pointer(skb);
773 struct tc_cookie *cookie;
775 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
776 goto nla_put_failure;
777 if (tcf_action_copy_stats(skb, a, 0))
778 goto nla_put_failure;
781 cookie = rcu_dereference(a->act_cookie);
783 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
785 goto nla_put_failure;
798 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
801 unsigned char *b = skb_tail_pointer(skb);
804 if (tcf_action_dump_terse(skb, a))
805 goto nla_put_failure;
807 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
808 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
809 a->hw_stats, TCA_ACT_HW_STATS_ANY))
810 goto nla_put_failure;
812 if (a->used_hw_stats_valid &&
813 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
814 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
815 goto nla_put_failure;
818 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
819 a->tcfa_flags, a->tcfa_flags))
820 goto nla_put_failure;
822 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
824 goto nla_put_failure;
825 err = tcf_action_dump_old(skb, a, bind, ref);
827 nla_nest_end(skb, nest);
835 EXPORT_SYMBOL(tcf_action_dump_1);
837 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
838 int bind, int ref, bool terse)
841 int err = -EINVAL, i;
844 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
846 nest = nla_nest_start_noflag(skb, i + 1);
848 goto nla_put_failure;
849 err = terse ? tcf_action_dump_terse(skb, a) :
850 tcf_action_dump_1(skb, a, bind, ref);
853 nla_nest_end(skb, nest);
861 nla_nest_cancel(skb, nest);
865 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
867 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
871 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
876 c->len = nla_len(tb[TCA_ACT_COOKIE]);
881 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
883 struct nla_bitfield32 hw_stats_bf;
885 /* If the user did not pass the attr, that means he does
886 * not care about the type. Return "any" in that case
887 * which is setting on all supported types.
890 return TCA_ACT_HW_STATS_ANY;
891 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
892 return hw_stats_bf.value;
895 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
896 [TCA_ACT_KIND] = { .type = NLA_STRING },
897 [TCA_ACT_INDEX] = { .type = NLA_U32 },
898 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
899 .len = TC_COOKIE_MAX_SIZE },
900 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
901 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS),
902 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
905 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
906 struct nlattr *nla, struct nlattr *est,
907 char *name, int ovr, int bind,
909 struct netlink_ext_ack *extack)
911 struct nla_bitfield32 flags = { 0, 0 };
912 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
914 struct tc_action_ops *a_o;
915 struct tc_cookie *cookie = NULL;
916 char act_name[IFNAMSIZ];
917 struct nlattr *tb[TCA_ACT_MAX + 1];
922 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
923 tcf_action_policy, extack);
927 kind = tb[TCA_ACT_KIND];
929 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
932 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
933 NL_SET_ERR_MSG(extack, "TC action name too long");
936 if (tb[TCA_ACT_COOKIE]) {
937 cookie = nla_memdup_cookie(tb);
939 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
944 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
945 if (tb[TCA_ACT_FLAGS])
946 flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
948 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
949 NL_SET_ERR_MSG(extack, "TC action name too long");
955 a_o = tc_lookup_action_n(act_name);
957 #ifdef CONFIG_MODULES
960 request_module("act_%s", act_name);
964 a_o = tc_lookup_action_n(act_name);
966 /* We dropped the RTNL semaphore in order to
967 * perform the module load. So, even if we
968 * succeeded in loading the module we have to
969 * tell the caller to replay the request. We
970 * indicate this using -EAGAIN.
977 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
982 /* backward compatibility for policer */
984 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
985 rtnl_held, tp, flags.value, extack);
987 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
988 tp, flags.value, extack);
992 if (!name && tb[TCA_ACT_COOKIE])
993 tcf_set_action_cookie(&a->act_cookie, cookie);
996 a->hw_stats = hw_stats;
998 /* module count goes up only when brand new policy is created
999 * if it exists and is only bound to in a_o->init() then
1000 * ACT_P_CREATED is not returned (a zero is).
1002 if (err != ACT_P_CREATED)
1003 module_put(a_o->owner);
1005 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
1006 !rcu_access_pointer(a->goto_chain)) {
1007 tcf_action_destroy_1(a, bind);
1008 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
1009 return ERR_PTR(-EINVAL);
1015 module_put(a_o->owner);
1018 kfree(cookie->data);
1021 return ERR_PTR(err);
1024 /* Returns numbers of initialized actions or negative error. */
1026 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1027 struct nlattr *est, char *name, int ovr, int bind,
1028 struct tc_action *actions[], size_t *attr_size,
1029 bool rtnl_held, struct netlink_ext_ack *extack)
1031 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1032 struct tc_action *act;
1037 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1042 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1043 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
1049 sz += tcf_action_fill_size(act);
1050 /* Start from index 0 */
1051 actions[i - 1] = act;
1054 *attr_size = tcf_action_full_attrs_size(sz);
1058 tcf_action_destroy(actions, bind);
1062 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets,
1065 if (a->cpu_bstats) {
1066 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1069 this_cpu_ptr(a->cpu_qstats)->drops += packets;
1072 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
1077 _bstats_update(&a->tcfa_bstats, bytes, packets);
1079 a->tcfa_qstats.drops += packets;
1081 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1083 EXPORT_SYMBOL(tcf_action_update_stats);
1085 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1094 /* compat_mode being true specifies a call that is supposed
1095 * to add additional backward compatibility statistic TLVs.
1098 if (p->type == TCA_OLD_COMPAT)
1099 err = gnet_stats_start_copy_compat(skb, 0,
1107 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1108 &p->tcfa_lock, &d, TCA_ACT_PAD);
1113 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1114 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1115 &p->tcfa_bstats_hw) < 0 ||
1116 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1117 gnet_stats_copy_queue(&d, p->cpu_qstats,
1119 p->tcfa_qstats.qlen) < 0)
1122 if (gnet_stats_finish_copy(&d) < 0)
1131 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1132 u32 portid, u32 seq, u16 flags, int event, int bind,
1136 struct nlmsghdr *nlh;
1137 unsigned char *b = skb_tail_pointer(skb);
1138 struct nlattr *nest;
1140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1142 goto out_nlmsg_trim;
1143 t = nlmsg_data(nlh);
1144 t->tca_family = AF_UNSPEC;
1148 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1150 goto out_nlmsg_trim;
1152 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1153 goto out_nlmsg_trim;
1155 nla_nest_end(skb, nest);
1157 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1166 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1167 struct tc_action *actions[], int event,
1168 struct netlink_ext_ack *extack)
1170 struct sk_buff *skb;
1172 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1175 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1177 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1182 return rtnl_unicast(skb, net, portid);
1185 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1186 struct nlmsghdr *n, u32 portid,
1187 struct netlink_ext_ack *extack)
1189 struct nlattr *tb[TCA_ACT_MAX + 1];
1190 const struct tc_action_ops *ops;
1191 struct tc_action *a;
1195 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1196 tcf_action_policy, extack);
1201 if (tb[TCA_ACT_INDEX] == NULL ||
1202 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1203 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1206 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1209 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1210 if (!ops) { /* could happen in batch of actions */
1211 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1215 if (ops->lookup(net, &a, index) == 0) {
1216 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1220 module_put(ops->owner);
1224 module_put(ops->owner);
1226 return ERR_PTR(err);
1229 static int tca_action_flush(struct net *net, struct nlattr *nla,
1230 struct nlmsghdr *n, u32 portid,
1231 struct netlink_ext_ack *extack)
1233 struct sk_buff *skb;
1235 struct nlmsghdr *nlh;
1237 struct netlink_callback dcb;
1238 struct nlattr *nest;
1239 struct nlattr *tb[TCA_ACT_MAX + 1];
1240 const struct tc_action_ops *ops;
1241 struct nlattr *kind;
1244 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1248 b = skb_tail_pointer(skb);
1250 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1251 tcf_action_policy, extack);
1256 kind = tb[TCA_ACT_KIND];
1257 ops = tc_lookup_action(kind);
1258 if (!ops) { /*some idjot trying to flush unknown action */
1259 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1263 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1266 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1267 goto out_module_put;
1269 t = nlmsg_data(nlh);
1270 t->tca_family = AF_UNSPEC;
1274 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1276 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1277 goto out_module_put;
1280 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1282 nla_nest_cancel(skb, nest);
1283 goto out_module_put;
1286 nla_nest_end(skb, nest);
1288 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1289 nlh->nlmsg_flags |= NLM_F_ROOT;
1290 module_put(ops->owner);
1291 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1292 n->nlmsg_flags & NLM_F_ECHO);
1296 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1301 module_put(ops->owner);
1307 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1311 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1312 struct tc_action *a = actions[i];
1313 const struct tc_action_ops *ops = a->ops;
1314 /* Actions can be deleted concurrently so we must save their
1315 * type and id to search again after reference is released.
1317 struct tcf_idrinfo *idrinfo = a->idrinfo;
1318 u32 act_index = a->tcfa_index;
1321 if (tcf_action_put(a)) {
1322 /* last reference, action was deleted concurrently */
1323 module_put(ops->owner);
1327 /* now do the delete */
1328 ret = tcf_idr_delete_index(idrinfo, act_index);
1337 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1338 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1341 struct sk_buff *skb;
1343 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1348 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1350 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1355 /* now do the delete */
1356 ret = tcf_action_delete(net, actions);
1358 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1363 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1364 n->nlmsg_flags & NLM_F_ECHO);
1371 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1372 u32 portid, int event, struct netlink_ext_ack *extack)
1375 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1376 struct tc_action *act;
1377 size_t attr_size = 0;
1378 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1380 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1385 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1387 return tca_action_flush(net, tb[1], n, portid, extack);
1389 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1393 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1394 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1399 attr_size += tcf_action_fill_size(act);
1400 actions[i - 1] = act;
1403 attr_size = tcf_action_full_attrs_size(attr_size);
1405 if (event == RTM_GETACTION)
1406 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1408 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1414 tcf_action_put_many(actions);
1419 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1420 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1422 struct sk_buff *skb;
1425 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1430 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1431 RTM_NEWACTION, 0, 0) <= 0) {
1432 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1437 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1438 n->nlmsg_flags & NLM_F_ECHO);
1444 static int tcf_action_add(struct net *net, struct nlattr *nla,
1445 struct nlmsghdr *n, u32 portid, int ovr,
1446 struct netlink_ext_ack *extack)
1448 size_t attr_size = 0;
1450 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1452 for (loop = 0; loop < 10; loop++) {
1453 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1454 actions, &attr_size, true, extack);
1461 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1463 tcf_action_put_many(actions);
1468 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1469 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_FLAG_LARGE_DUMP_ON),
1470 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1473 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1474 struct netlink_ext_ack *extack)
1476 struct net *net = sock_net(skb->sk);
1477 struct nlattr *tca[TCA_ROOT_MAX + 1];
1478 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1479 int ret = 0, ovr = 0;
1481 if ((n->nlmsg_type != RTM_GETACTION) &&
1482 !netlink_capable(skb, CAP_NET_ADMIN))
1485 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1486 TCA_ROOT_MAX, NULL, extack);
1490 if (tca[TCA_ACT_TAB] == NULL) {
1491 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1495 /* n->nlmsg_flags & NLM_F_CREATE */
1496 switch (n->nlmsg_type) {
1498 /* we are going to assume all other flags
1499 * imply create only if it doesn't exist
1500 * Note that CREATE | EXCL implies that
1501 * but since we want avoid ambiguity (eg when flags
1502 * is zero) then just set this
1504 if (n->nlmsg_flags & NLM_F_REPLACE)
1506 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1510 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1511 portid, RTM_DELACTION, extack);
1514 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1515 portid, RTM_GETACTION, extack);
1524 static struct nlattr *find_dump_kind(struct nlattr **nla)
1526 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1527 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1528 struct nlattr *kind;
1530 tb1 = nla[TCA_ACT_TAB];
1534 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1539 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1541 kind = tb2[TCA_ACT_KIND];
1546 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1548 struct net *net = sock_net(skb->sk);
1549 struct nlmsghdr *nlh;
1550 unsigned char *b = skb_tail_pointer(skb);
1551 struct nlattr *nest;
1552 struct tc_action_ops *a_o;
1554 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1555 struct nlattr *tb[TCA_ROOT_MAX + 1];
1556 struct nlattr *count_attr = NULL;
1557 unsigned long jiffy_since = 0;
1558 struct nlattr *kind = NULL;
1559 struct nla_bitfield32 bf;
1560 u32 msecs_since = 0;
1563 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1564 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1568 kind = find_dump_kind(tb);
1570 pr_info("tc_dump_action: action bad kind\n");
1574 a_o = tc_lookup_action(kind);
1579 if (tb[TCA_ROOT_FLAGS]) {
1580 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1581 cb->args[2] = bf.value;
1584 if (tb[TCA_ROOT_TIME_DELTA]) {
1585 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1588 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1589 cb->nlh->nlmsg_type, sizeof(*t), 0);
1591 goto out_module_put;
1594 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1596 t = nlmsg_data(nlh);
1597 t->tca_family = AF_UNSPEC;
1600 cb->args[3] = jiffy_since;
1601 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1603 goto out_module_put;
1605 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1607 goto out_module_put;
1609 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1611 goto out_module_put;
1614 nla_nest_end(skb, nest);
1616 act_count = cb->args[1];
1617 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1622 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1623 if (NETLINK_CB(cb->skb).portid && ret)
1624 nlh->nlmsg_flags |= NLM_F_MULTI;
1625 module_put(a_o->owner);
1629 module_put(a_o->owner);
1634 static int __init tc_action_init(void)
1636 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1637 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1638 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1644 subsys_initcall(tc_action_init);