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>
26 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
27 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
30 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
33 if (static_branch_unlikely(&tcf_frag_xmit_count))
34 return sch_frag_xmit_hook(skb, xmit);
39 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
41 static void tcf_action_goto_chain_exec(const struct tc_action *a,
42 struct tcf_result *res)
44 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
46 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
49 static void tcf_free_cookie_rcu(struct rcu_head *p)
51 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
57 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
58 struct tc_cookie *new_cookie)
60 struct tc_cookie *old;
62 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
64 call_rcu(&old->rcu, tcf_free_cookie_rcu);
67 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
68 struct tcf_chain **newchain,
69 struct netlink_ext_ack *extack)
71 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
75 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
76 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
79 NL_SET_ERR_MSG(extack, "invalid control action");
83 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
84 chain_index = action & TC_ACT_EXT_VAL_MASK;
85 if (!tp || !newchain) {
87 NL_SET_ERR_MSG(extack,
88 "can't goto NULL proto/chain");
91 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
94 NL_SET_ERR_MSG(extack,
95 "can't allocate goto_chain");
101 EXPORT_SYMBOL(tcf_action_check_ctrlact);
103 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
104 struct tcf_chain *goto_chain)
106 a->tcfa_action = action;
107 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
110 EXPORT_SYMBOL(tcf_action_set_ctrlact);
112 /* XXX: For standalone actions, we don't need a RCU grace period either, because
113 * actions are always connected to filters and filters are already destroyed in
114 * RCU callbacks, so after a RCU grace period actions are already disconnected
115 * from filters. Readers later can not find us.
117 static void free_tcf(struct tc_action *p)
119 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
121 free_percpu(p->cpu_bstats);
122 free_percpu(p->cpu_bstats_hw);
123 free_percpu(p->cpu_qstats);
125 tcf_set_action_cookie(&p->act_cookie, NULL);
127 tcf_chain_put_by_act(chain);
132 static void tcf_action_cleanup(struct tc_action *p)
137 gen_kill_estimator(&p->tcfa_rate_est);
141 static int __tcf_action_put(struct tc_action *p, bool bind)
143 struct tcf_idrinfo *idrinfo = p->idrinfo;
145 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
147 atomic_dec(&p->tcfa_bindcnt);
148 idr_remove(&idrinfo->action_idr, p->tcfa_index);
149 mutex_unlock(&idrinfo->lock);
151 tcf_action_cleanup(p);
156 atomic_dec(&p->tcfa_bindcnt);
161 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
165 /* Release with strict==1 and bind==0 is only called through act API
166 * interface (classifiers always bind). Only case when action with
167 * positive reference count and zero bind count can exist is when it was
168 * also created with act API (unbinding last classifier will destroy the
169 * action if it was created by classifier). So only case when bind count
170 * can be changed after initial check is when unbound action is
171 * destroyed by act API while classifier binds to action with same id
172 * concurrently. This result either creation of new action(same behavior
173 * as before), or reusing existing action if concurrent process
174 * increments reference count before action is deleted. Both scenarios
178 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
181 if (__tcf_action_put(p, bind))
188 int tcf_idr_release(struct tc_action *a, bool bind)
190 const struct tc_action_ops *ops = a->ops;
193 ret = __tcf_idr_release(a, bind, false);
194 if (ret == ACT_P_DELETED)
195 module_put(ops->owner);
198 EXPORT_SYMBOL(tcf_idr_release);
200 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
202 struct tc_cookie *act_cookie;
206 act_cookie = rcu_dereference(act->act_cookie);
209 cookie_len = nla_total_size(act_cookie->len);
212 return nla_total_size(0) /* action number nested */
213 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
214 + cookie_len /* TCA_ACT_COOKIE */
215 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
216 + nla_total_size(0) /* TCA_ACT_STATS nested */
217 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
218 /* TCA_STATS_BASIC */
219 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
220 /* TCA_STATS_PKT64 */
221 + nla_total_size_64bit(sizeof(u64))
222 /* TCA_STATS_QUEUE */
223 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
224 + nla_total_size(0) /* TCA_OPTIONS nested */
225 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
228 static size_t tcf_action_full_attrs_size(size_t sz)
230 return NLMSG_HDRLEN /* struct nlmsghdr */
231 + sizeof(struct tcamsg)
232 + nla_total_size(0) /* TCA_ACT_TAB nested */
236 static size_t tcf_action_fill_size(const struct tc_action *act)
238 size_t sz = tcf_action_shared_attrs_size(act);
240 if (act->ops->get_fill_size)
241 return act->ops->get_fill_size(act) + sz;
246 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
248 unsigned char *b = skb_tail_pointer(skb);
249 struct tc_cookie *cookie;
251 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
252 goto nla_put_failure;
253 if (tcf_action_copy_stats(skb, a, 0))
254 goto nla_put_failure;
255 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
256 goto nla_put_failure;
259 cookie = rcu_dereference(a->act_cookie);
261 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
263 goto nla_put_failure;
275 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
276 struct netlink_callback *cb)
278 int err = 0, index = -1, s_i = 0, n_i = 0;
279 u32 act_flags = cb->args[2];
280 unsigned long jiffy_since = cb->args[3];
282 struct idr *idr = &idrinfo->action_idr;
284 unsigned long id = 1;
287 mutex_lock(&idrinfo->lock);
291 idr_for_each_entry_ul(idr, p, tmp, id) {
299 time_after(jiffy_since,
300 (unsigned long)p->tcfa_tm.lastuse))
303 nest = nla_nest_start_noflag(skb, n_i);
306 goto nla_put_failure;
308 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
309 tcf_action_dump_terse(skb, p, true) :
310 tcf_action_dump_1(skb, p, 0, 0);
313 nlmsg_trim(skb, nest);
316 nla_nest_end(skb, nest);
318 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
319 n_i >= TCA_ACT_MAX_PRIO)
324 cb->args[0] = index + 1;
326 mutex_unlock(&idrinfo->lock);
328 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
334 nla_nest_cancel(skb, nest);
338 static int tcf_idr_release_unsafe(struct tc_action *p)
340 if (atomic_read(&p->tcfa_bindcnt) > 0)
343 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
344 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
345 tcf_action_cleanup(p);
346 return ACT_P_DELETED;
352 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
353 const struct tc_action_ops *ops)
358 struct idr *idr = &idrinfo->action_idr;
360 unsigned long id = 1;
363 nest = nla_nest_start_noflag(skb, 0);
365 goto nla_put_failure;
366 if (nla_put_string(skb, TCA_KIND, ops->kind))
367 goto nla_put_failure;
369 mutex_lock(&idrinfo->lock);
370 idr_for_each_entry_ul(idr, p, tmp, id) {
373 ret = tcf_idr_release_unsafe(p);
374 if (ret == ACT_P_DELETED) {
375 module_put(ops->owner);
377 } else if (ret < 0) {
378 mutex_unlock(&idrinfo->lock);
379 goto nla_put_failure;
382 mutex_unlock(&idrinfo->lock);
384 if (nla_put_u32(skb, TCA_FCNT, n_i))
385 goto nla_put_failure;
386 nla_nest_end(skb, nest);
390 nla_nest_cancel(skb, nest);
394 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
395 struct netlink_callback *cb, int type,
396 const struct tc_action_ops *ops,
397 struct netlink_ext_ack *extack)
399 struct tcf_idrinfo *idrinfo = tn->idrinfo;
401 if (type == RTM_DELACTION) {
402 return tcf_del_walker(idrinfo, skb, ops);
403 } else if (type == RTM_GETACTION) {
404 return tcf_dump_walker(idrinfo, skb, cb);
406 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
407 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
411 EXPORT_SYMBOL(tcf_generic_walker);
413 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
415 struct tcf_idrinfo *idrinfo = tn->idrinfo;
418 mutex_lock(&idrinfo->lock);
419 p = idr_find(&idrinfo->action_idr, index);
423 refcount_inc(&p->tcfa_refcnt);
424 mutex_unlock(&idrinfo->lock);
432 EXPORT_SYMBOL(tcf_idr_search);
434 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
439 mutex_lock(&idrinfo->lock);
440 p = idr_find(&idrinfo->action_idr, index);
442 mutex_unlock(&idrinfo->lock);
446 if (!atomic_read(&p->tcfa_bindcnt)) {
447 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
448 struct module *owner = p->ops->owner;
450 WARN_ON(p != idr_remove(&idrinfo->action_idr,
452 mutex_unlock(&idrinfo->lock);
454 tcf_action_cleanup(p);
463 mutex_unlock(&idrinfo->lock);
467 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
468 struct tc_action **a, const struct tc_action_ops *ops,
469 int bind, bool cpustats, u32 flags)
471 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
472 struct tcf_idrinfo *idrinfo = tn->idrinfo;
477 refcount_set(&p->tcfa_refcnt, 1);
479 atomic_set(&p->tcfa_bindcnt, 1);
482 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
485 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
486 if (!p->cpu_bstats_hw)
488 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
492 spin_lock_init(&p->tcfa_lock);
493 p->tcfa_index = index;
494 p->tcfa_tm.install = jiffies;
495 p->tcfa_tm.lastuse = jiffies;
496 p->tcfa_tm.firstuse = 0;
497 p->tcfa_flags = flags;
499 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
501 &p->tcfa_lock, NULL, est);
506 p->idrinfo = idrinfo;
507 __module_get(ops->owner);
512 free_percpu(p->cpu_qstats);
514 free_percpu(p->cpu_bstats_hw);
516 free_percpu(p->cpu_bstats);
521 EXPORT_SYMBOL(tcf_idr_create);
523 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
524 struct nlattr *est, struct tc_action **a,
525 const struct tc_action_ops *ops, int bind,
528 /* Set cpustats according to actions flags. */
529 return tcf_idr_create(tn, index, est, a, ops, bind,
530 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
532 EXPORT_SYMBOL(tcf_idr_create_from_flags);
534 /* Cleanup idr index that was allocated but not initialized. */
536 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
538 struct tcf_idrinfo *idrinfo = tn->idrinfo;
540 mutex_lock(&idrinfo->lock);
541 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
542 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
543 mutex_unlock(&idrinfo->lock);
545 EXPORT_SYMBOL(tcf_idr_cleanup);
547 /* Check if action with specified index exists. If actions is found, increments
548 * its reference and bind counters, and return 1. Otherwise insert temporary
549 * error pointer (to prevent concurrent users from inserting actions with same
550 * index) and return 0.
553 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
554 struct tc_action **a, int bind)
556 struct tcf_idrinfo *idrinfo = tn->idrinfo;
561 mutex_lock(&idrinfo->lock);
563 p = idr_find(&idrinfo->action_idr, *index);
565 /* This means that another process allocated
566 * index but did not assign the pointer yet.
568 mutex_unlock(&idrinfo->lock);
573 refcount_inc(&p->tcfa_refcnt);
575 atomic_inc(&p->tcfa_bindcnt);
580 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
583 idr_replace(&idrinfo->action_idr,
584 ERR_PTR(-EBUSY), *index);
589 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
590 UINT_MAX, GFP_KERNEL);
592 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
595 mutex_unlock(&idrinfo->lock);
598 EXPORT_SYMBOL(tcf_idr_check_alloc);
600 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
601 struct tcf_idrinfo *idrinfo)
603 struct idr *idr = &idrinfo->action_idr;
606 unsigned long id = 1;
609 idr_for_each_entry_ul(idr, p, tmp, id) {
610 ret = __tcf_idr_release(p, false, true);
611 if (ret == ACT_P_DELETED)
612 module_put(ops->owner);
616 idr_destroy(&idrinfo->action_idr);
618 EXPORT_SYMBOL(tcf_idrinfo_destroy);
620 static LIST_HEAD(act_base);
621 static DEFINE_RWLOCK(act_mod_lock);
623 int tcf_register_action(struct tc_action_ops *act,
624 struct pernet_operations *ops)
626 struct tc_action_ops *a;
629 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
632 /* We have to register pernet ops before making the action ops visible,
633 * otherwise tcf_action_init_1() could get a partially initialized
636 ret = register_pernet_subsys(ops);
640 write_lock(&act_mod_lock);
641 list_for_each_entry(a, &act_base, head) {
642 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
643 write_unlock(&act_mod_lock);
644 unregister_pernet_subsys(ops);
648 list_add_tail(&act->head, &act_base);
649 write_unlock(&act_mod_lock);
653 EXPORT_SYMBOL(tcf_register_action);
655 int tcf_unregister_action(struct tc_action_ops *act,
656 struct pernet_operations *ops)
658 struct tc_action_ops *a;
661 write_lock(&act_mod_lock);
662 list_for_each_entry(a, &act_base, head) {
664 list_del(&act->head);
669 write_unlock(&act_mod_lock);
671 unregister_pernet_subsys(ops);
674 EXPORT_SYMBOL(tcf_unregister_action);
677 static struct tc_action_ops *tc_lookup_action_n(char *kind)
679 struct tc_action_ops *a, *res = NULL;
682 read_lock(&act_mod_lock);
683 list_for_each_entry(a, &act_base, head) {
684 if (strcmp(kind, a->kind) == 0) {
685 if (try_module_get(a->owner))
690 read_unlock(&act_mod_lock);
695 /* lookup by nlattr */
696 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
698 struct tc_action_ops *a, *res = NULL;
701 read_lock(&act_mod_lock);
702 list_for_each_entry(a, &act_base, head) {
703 if (nla_strcmp(kind, a->kind) == 0) {
704 if (try_module_get(a->owner))
709 read_unlock(&act_mod_lock);
714 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
715 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
716 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
717 int nr_actions, struct tcf_result *res)
720 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
724 if (skb_skip_tc_classify(skb))
728 for (i = 0; i < nr_actions; i++) {
729 const struct tc_action *a = actions[i];
731 if (jmp_prgcnt > 0) {
736 ret = a->ops->act(skb, a, res);
737 if (ret == TC_ACT_REPEAT)
738 goto repeat; /* we need a ttl - JHS */
740 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
741 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
742 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
743 /* faulty opcode, stop pipeline */
748 goto restart_act_graph;
749 else /* faulty graph, stop pipeline */
752 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
753 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
754 net_warn_ratelimited("can't go to NULL chain!\n");
757 tcf_action_goto_chain_exec(a, res);
760 if (ret != TC_ACT_PIPE)
766 EXPORT_SYMBOL(tcf_action_exec);
768 int tcf_action_destroy(struct tc_action *actions[], int bind)
770 const struct tc_action_ops *ops;
774 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
778 ret = __tcf_idr_release(a, bind, true);
779 if (ret == ACT_P_DELETED)
780 module_put(ops->owner);
787 static int tcf_action_put(struct tc_action *p)
789 return __tcf_action_put(p, false);
792 /* Put all actions in this array, skip those NULL's. */
793 static void tcf_action_put_many(struct tc_action *actions[])
797 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
798 struct tc_action *a = actions[i];
799 const struct tc_action_ops *ops;
804 if (tcf_action_put(a))
805 module_put(ops->owner);
810 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
812 return a->ops->dump(skb, a, bind, ref);
816 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
819 unsigned char *b = skb_tail_pointer(skb);
822 if (tcf_action_dump_terse(skb, a, false))
823 goto nla_put_failure;
825 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
826 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
827 a->hw_stats, TCA_ACT_HW_STATS_ANY))
828 goto nla_put_failure;
830 if (a->used_hw_stats_valid &&
831 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
832 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
833 goto nla_put_failure;
836 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
837 a->tcfa_flags, a->tcfa_flags))
838 goto nla_put_failure;
840 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
842 goto nla_put_failure;
843 err = tcf_action_dump_old(skb, a, bind, ref);
845 nla_nest_end(skb, nest);
853 EXPORT_SYMBOL(tcf_action_dump_1);
855 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
856 int bind, int ref, bool terse)
859 int err = -EINVAL, i;
862 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
864 nest = nla_nest_start_noflag(skb, i + 1);
866 goto nla_put_failure;
867 err = terse ? tcf_action_dump_terse(skb, a, false) :
868 tcf_action_dump_1(skb, a, bind, ref);
871 nla_nest_end(skb, nest);
879 nla_nest_cancel(skb, nest);
883 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
885 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
889 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
894 c->len = nla_len(tb[TCA_ACT_COOKIE]);
899 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
901 struct nla_bitfield32 hw_stats_bf;
903 /* If the user did not pass the attr, that means he does
904 * not care about the type. Return "any" in that case
905 * which is setting on all supported types.
908 return TCA_ACT_HW_STATS_ANY;
909 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
910 return hw_stats_bf.value;
913 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
914 [TCA_ACT_KIND] = { .type = NLA_STRING },
915 [TCA_ACT_INDEX] = { .type = NLA_U32 },
916 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
917 .len = TC_COOKIE_MAX_SIZE },
918 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
919 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS),
920 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
923 void tcf_idr_insert_many(struct tc_action *actions[])
927 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
928 struct tc_action *a = actions[i];
929 struct tcf_idrinfo *idrinfo;
933 idrinfo = a->idrinfo;
934 mutex_lock(&idrinfo->lock);
935 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
936 * it is just created, otherwise this is just a nop.
938 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
939 mutex_unlock(&idrinfo->lock);
943 struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
945 struct netlink_ext_ack *extack)
947 struct nlattr *tb[TCA_ACT_MAX + 1];
948 struct tc_action_ops *a_o;
949 char act_name[IFNAMSIZ];
954 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
955 tcf_action_policy, extack);
959 kind = tb[TCA_ACT_KIND];
961 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
964 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
965 NL_SET_ERR_MSG(extack, "TC action name too long");
969 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
970 NL_SET_ERR_MSG(extack, "TC action name too long");
971 return ERR_PTR(-EINVAL);
975 a_o = tc_lookup_action_n(act_name);
977 #ifdef CONFIG_MODULES
980 request_module("act_%s", act_name);
984 a_o = tc_lookup_action_n(act_name);
986 /* We dropped the RTNL semaphore in order to
987 * perform the module load. So, even if we
988 * succeeded in loading the module we have to
989 * tell the caller to replay the request. We
990 * indicate this using -EAGAIN.
993 module_put(a_o->owner);
994 return ERR_PTR(-EAGAIN);
997 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
998 return ERR_PTR(-ENOENT);
1004 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1005 struct nlattr *nla, struct nlattr *est,
1006 char *name, int ovr, int bind,
1007 struct tc_action_ops *a_o, int *init_res,
1009 struct netlink_ext_ack *extack)
1011 struct nla_bitfield32 flags = { 0, 0 };
1012 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1013 struct nlattr *tb[TCA_ACT_MAX + 1];
1014 struct tc_cookie *cookie = NULL;
1015 struct tc_action *a;
1018 /* backward compatibility for policer */
1020 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1021 tcf_action_policy, extack);
1023 return ERR_PTR(err);
1024 if (tb[TCA_ACT_COOKIE]) {
1025 cookie = nla_memdup_cookie(tb);
1027 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1032 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1033 if (tb[TCA_ACT_FLAGS])
1034 flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1036 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
1037 rtnl_held, tp, flags.value, extack);
1039 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
1040 tp, flags.value, extack);
1046 if (!name && tb[TCA_ACT_COOKIE])
1047 tcf_set_action_cookie(&a->act_cookie, cookie);
1050 a->hw_stats = hw_stats;
1056 kfree(cookie->data);
1059 return ERR_PTR(err);
1062 /* Returns numbers of initialized actions or negative error. */
1064 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1065 struct nlattr *est, char *name, int ovr, int bind,
1066 struct tc_action *actions[], int init_res[], size_t *attr_size,
1067 bool rtnl_held, struct netlink_ext_ack *extack)
1069 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1070 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1071 struct tc_action *act;
1076 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1081 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1082 struct tc_action_ops *a_o;
1084 a_o = tc_action_load_ops(name, tb[i], rtnl_held, extack);
1092 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1093 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
1094 ops[i - 1], &init_res[i - 1], rtnl_held,
1100 sz += tcf_action_fill_size(act);
1101 /* Start from index 0 */
1102 actions[i - 1] = act;
1105 /* We have to commit them all together, because if any error happened in
1106 * between, we could not handle the failure gracefully.
1108 tcf_idr_insert_many(actions);
1110 *attr_size = tcf_action_full_attrs_size(sz);
1115 tcf_action_destroy(actions, bind);
1117 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1119 module_put(ops[i]->owner);
1124 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1127 if (a->cpu_bstats) {
1128 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1130 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1133 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
1138 _bstats_update(&a->tcfa_bstats, bytes, packets);
1139 a->tcfa_qstats.drops += drops;
1141 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1143 EXPORT_SYMBOL(tcf_action_update_stats);
1145 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1154 /* compat_mode being true specifies a call that is supposed
1155 * to add additional backward compatibility statistic TLVs.
1158 if (p->type == TCA_OLD_COMPAT)
1159 err = gnet_stats_start_copy_compat(skb, 0,
1167 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1168 &p->tcfa_lock, &d, TCA_ACT_PAD);
1173 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1174 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1175 &p->tcfa_bstats_hw) < 0 ||
1176 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1177 gnet_stats_copy_queue(&d, p->cpu_qstats,
1179 p->tcfa_qstats.qlen) < 0)
1182 if (gnet_stats_finish_copy(&d) < 0)
1191 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1192 u32 portid, u32 seq, u16 flags, int event, int bind,
1196 struct nlmsghdr *nlh;
1197 unsigned char *b = skb_tail_pointer(skb);
1198 struct nlattr *nest;
1200 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1202 goto out_nlmsg_trim;
1203 t = nlmsg_data(nlh);
1204 t->tca_family = AF_UNSPEC;
1208 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1210 goto out_nlmsg_trim;
1212 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1213 goto out_nlmsg_trim;
1215 nla_nest_end(skb, nest);
1217 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1226 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1227 struct tc_action *actions[], int event,
1228 struct netlink_ext_ack *extack)
1230 struct sk_buff *skb;
1232 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1235 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1237 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1242 return rtnl_unicast(skb, net, portid);
1245 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1246 struct nlmsghdr *n, u32 portid,
1247 struct netlink_ext_ack *extack)
1249 struct nlattr *tb[TCA_ACT_MAX + 1];
1250 const struct tc_action_ops *ops;
1251 struct tc_action *a;
1255 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1256 tcf_action_policy, extack);
1261 if (tb[TCA_ACT_INDEX] == NULL ||
1262 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1263 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1266 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1269 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1270 if (!ops) { /* could happen in batch of actions */
1271 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1275 if (ops->lookup(net, &a, index) == 0) {
1276 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1280 module_put(ops->owner);
1284 module_put(ops->owner);
1286 return ERR_PTR(err);
1289 static int tca_action_flush(struct net *net, struct nlattr *nla,
1290 struct nlmsghdr *n, u32 portid,
1291 struct netlink_ext_ack *extack)
1293 struct sk_buff *skb;
1295 struct nlmsghdr *nlh;
1297 struct netlink_callback dcb;
1298 struct nlattr *nest;
1299 struct nlattr *tb[TCA_ACT_MAX + 1];
1300 const struct tc_action_ops *ops;
1301 struct nlattr *kind;
1304 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1308 b = skb_tail_pointer(skb);
1310 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1311 tcf_action_policy, extack);
1316 kind = tb[TCA_ACT_KIND];
1317 ops = tc_lookup_action(kind);
1318 if (!ops) { /*some idjot trying to flush unknown action */
1319 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1323 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1326 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1327 goto out_module_put;
1329 t = nlmsg_data(nlh);
1330 t->tca_family = AF_UNSPEC;
1334 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1336 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1337 goto out_module_put;
1340 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1342 nla_nest_cancel(skb, nest);
1343 goto out_module_put;
1346 nla_nest_end(skb, nest);
1348 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1349 nlh->nlmsg_flags |= NLM_F_ROOT;
1350 module_put(ops->owner);
1351 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1352 n->nlmsg_flags & NLM_F_ECHO);
1356 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1361 module_put(ops->owner);
1367 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1371 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1372 struct tc_action *a = actions[i];
1373 const struct tc_action_ops *ops = a->ops;
1374 /* Actions can be deleted concurrently so we must save their
1375 * type and id to search again after reference is released.
1377 struct tcf_idrinfo *idrinfo = a->idrinfo;
1378 u32 act_index = a->tcfa_index;
1381 if (tcf_action_put(a)) {
1382 /* last reference, action was deleted concurrently */
1383 module_put(ops->owner);
1387 /* now do the delete */
1388 ret = tcf_idr_delete_index(idrinfo, act_index);
1397 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1398 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1401 struct sk_buff *skb;
1403 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1408 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1410 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1415 /* now do the delete */
1416 ret = tcf_action_delete(net, actions);
1418 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1423 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1424 n->nlmsg_flags & NLM_F_ECHO);
1431 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1432 u32 portid, int event, struct netlink_ext_ack *extack)
1435 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1436 struct tc_action *act;
1437 size_t attr_size = 0;
1438 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1440 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1445 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1447 return tca_action_flush(net, tb[1], n, portid, extack);
1449 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1453 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1454 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1459 attr_size += tcf_action_fill_size(act);
1460 actions[i - 1] = act;
1463 attr_size = tcf_action_full_attrs_size(attr_size);
1465 if (event == RTM_GETACTION)
1466 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1468 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1474 tcf_action_put_many(actions);
1479 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1480 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1482 struct sk_buff *skb;
1485 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1490 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1491 RTM_NEWACTION, 0, 0) <= 0) {
1492 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1497 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1498 n->nlmsg_flags & NLM_F_ECHO);
1504 static int tcf_action_add(struct net *net, struct nlattr *nla,
1505 struct nlmsghdr *n, u32 portid, int ovr,
1506 struct netlink_ext_ack *extack)
1508 size_t attr_size = 0;
1510 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1511 int init_res[TCA_ACT_MAX_PRIO] = {};
1513 for (loop = 0; loop < 10; loop++) {
1514 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1515 actions, init_res, &attr_size, true, extack);
1522 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1524 /* only put existing actions */
1525 for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
1526 if (init_res[i] == ACT_P_CREATED)
1528 tcf_action_put_many(actions);
1533 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1534 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
1535 TCA_ACT_FLAG_TERSE_DUMP),
1536 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1539 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1540 struct netlink_ext_ack *extack)
1542 struct net *net = sock_net(skb->sk);
1543 struct nlattr *tca[TCA_ROOT_MAX + 1];
1544 u32 portid = NETLINK_CB(skb).portid;
1545 int ret = 0, ovr = 0;
1547 if ((n->nlmsg_type != RTM_GETACTION) &&
1548 !netlink_capable(skb, CAP_NET_ADMIN))
1551 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1552 TCA_ROOT_MAX, NULL, extack);
1556 if (tca[TCA_ACT_TAB] == NULL) {
1557 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1561 /* n->nlmsg_flags & NLM_F_CREATE */
1562 switch (n->nlmsg_type) {
1564 /* we are going to assume all other flags
1565 * imply create only if it doesn't exist
1566 * Note that CREATE | EXCL implies that
1567 * but since we want avoid ambiguity (eg when flags
1568 * is zero) then just set this
1570 if (n->nlmsg_flags & NLM_F_REPLACE)
1572 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1576 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1577 portid, RTM_DELACTION, extack);
1580 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1581 portid, RTM_GETACTION, extack);
1590 static struct nlattr *find_dump_kind(struct nlattr **nla)
1592 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1593 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1594 struct nlattr *kind;
1596 tb1 = nla[TCA_ACT_TAB];
1600 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1605 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1607 kind = tb2[TCA_ACT_KIND];
1612 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1614 struct net *net = sock_net(skb->sk);
1615 struct nlmsghdr *nlh;
1616 unsigned char *b = skb_tail_pointer(skb);
1617 struct nlattr *nest;
1618 struct tc_action_ops *a_o;
1620 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1621 struct nlattr *tb[TCA_ROOT_MAX + 1];
1622 struct nlattr *count_attr = NULL;
1623 unsigned long jiffy_since = 0;
1624 struct nlattr *kind = NULL;
1625 struct nla_bitfield32 bf;
1626 u32 msecs_since = 0;
1629 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1630 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1634 kind = find_dump_kind(tb);
1636 pr_info("tc_dump_action: action bad kind\n");
1640 a_o = tc_lookup_action(kind);
1645 if (tb[TCA_ROOT_FLAGS]) {
1646 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1647 cb->args[2] = bf.value;
1650 if (tb[TCA_ROOT_TIME_DELTA]) {
1651 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1654 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1655 cb->nlh->nlmsg_type, sizeof(*t), 0);
1657 goto out_module_put;
1660 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1662 t = nlmsg_data(nlh);
1663 t->tca_family = AF_UNSPEC;
1666 cb->args[3] = jiffy_since;
1667 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1669 goto out_module_put;
1671 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1673 goto out_module_put;
1675 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1677 goto out_module_put;
1680 nla_nest_end(skb, nest);
1682 act_count = cb->args[1];
1683 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1688 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1689 if (NETLINK_CB(cb->skb).portid && ret)
1690 nlh->nlmsg_flags |= NLM_F_MULTI;
1691 module_put(a_o->owner);
1695 module_put(a_o->owner);
1700 static int __init tc_action_init(void)
1702 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1703 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1704 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1710 subsys_initcall(tc_action_init);