2 * net/sched/act_api.c Packet action API.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Author: Jamal Hadi Salim
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/init.h>
21 #include <linux/kmod.h>
22 #include <linux/err.h>
23 #include <linux/module.h>
24 #include <net/net_namespace.h>
26 #include <net/sch_generic.h>
27 #include <net/pkt_cls.h>
28 #include <net/act_api.h>
29 #include <net/netlink.h>
31 static void tcf_action_goto_chain_exec(const struct tc_action *a,
32 struct tcf_result *res)
34 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
36 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
39 static void tcf_free_cookie_rcu(struct rcu_head *p)
41 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
47 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
48 struct tc_cookie *new_cookie)
50 struct tc_cookie *old;
52 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
54 call_rcu(&old->rcu, tcf_free_cookie_rcu);
57 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
58 struct tcf_chain **newchain,
59 struct netlink_ext_ack *extack)
61 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
65 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
66 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
69 NL_SET_ERR_MSG(extack, "invalid control action");
73 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
74 chain_index = action & TC_ACT_EXT_VAL_MASK;
75 if (!tp || !newchain) {
77 NL_SET_ERR_MSG(extack,
78 "can't goto NULL proto/chain");
81 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
84 NL_SET_ERR_MSG(extack,
85 "can't allocate goto_chain");
91 EXPORT_SYMBOL(tcf_action_check_ctrlact);
93 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
94 struct tcf_chain *goto_chain)
96 a->tcfa_action = action;
97 rcu_swap_protected(a->goto_chain, goto_chain, 1);
100 EXPORT_SYMBOL(tcf_action_set_ctrlact);
102 /* XXX: For standalone actions, we don't need a RCU grace period either, because
103 * actions are always connected to filters and filters are already destroyed in
104 * RCU callbacks, so after a RCU grace period actions are already disconnected
105 * from filters. Readers later can not find us.
107 static void free_tcf(struct tc_action *p)
109 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
111 free_percpu(p->cpu_bstats);
112 free_percpu(p->cpu_bstats_hw);
113 free_percpu(p->cpu_qstats);
115 tcf_set_action_cookie(&p->act_cookie, NULL);
117 tcf_chain_put_by_act(chain);
122 static void tcf_action_cleanup(struct tc_action *p)
127 gen_kill_estimator(&p->tcfa_rate_est);
131 static int __tcf_action_put(struct tc_action *p, bool bind)
133 struct tcf_idrinfo *idrinfo = p->idrinfo;
135 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
137 atomic_dec(&p->tcfa_bindcnt);
138 idr_remove(&idrinfo->action_idr, p->tcfa_index);
139 mutex_unlock(&idrinfo->lock);
141 tcf_action_cleanup(p);
146 atomic_dec(&p->tcfa_bindcnt);
151 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
155 /* Release with strict==1 and bind==0 is only called through act API
156 * interface (classifiers always bind). Only case when action with
157 * positive reference count and zero bind count can exist is when it was
158 * also created with act API (unbinding last classifier will destroy the
159 * action if it was created by classifier). So only case when bind count
160 * can be changed after initial check is when unbound action is
161 * destroyed by act API while classifier binds to action with same id
162 * concurrently. This result either creation of new action(same behavior
163 * as before), or reusing existing action if concurrent process
164 * increments reference count before action is deleted. Both scenarios
168 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
171 if (__tcf_action_put(p, bind))
177 EXPORT_SYMBOL(__tcf_idr_release);
179 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
181 struct tc_cookie *act_cookie;
185 act_cookie = rcu_dereference(act->act_cookie);
188 cookie_len = nla_total_size(act_cookie->len);
191 return nla_total_size(0) /* action number nested */
192 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
193 + cookie_len /* TCA_ACT_COOKIE */
194 + nla_total_size(0) /* TCA_ACT_STATS nested */
195 /* TCA_STATS_BASIC */
196 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
197 /* TCA_STATS_QUEUE */
198 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
199 + nla_total_size(0) /* TCA_OPTIONS nested */
200 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
203 static size_t tcf_action_full_attrs_size(size_t sz)
205 return NLMSG_HDRLEN /* struct nlmsghdr */
206 + sizeof(struct tcamsg)
207 + nla_total_size(0) /* TCA_ACT_TAB nested */
211 static size_t tcf_action_fill_size(const struct tc_action *act)
213 size_t sz = tcf_action_shared_attrs_size(act);
215 if (act->ops->get_fill_size)
216 return act->ops->get_fill_size(act) + sz;
220 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
221 struct netlink_callback *cb)
223 int err = 0, index = -1, s_i = 0, n_i = 0;
224 u32 act_flags = cb->args[2];
225 unsigned long jiffy_since = cb->args[3];
227 struct idr *idr = &idrinfo->action_idr;
229 unsigned long id = 1;
231 mutex_lock(&idrinfo->lock);
235 idr_for_each_entry_ul(idr, p, id) {
241 time_after(jiffy_since,
242 (unsigned long)p->tcfa_tm.lastuse))
245 nest = nla_nest_start_noflag(skb, n_i);
248 goto nla_put_failure;
250 err = tcf_action_dump_1(skb, p, 0, 0);
253 nlmsg_trim(skb, nest);
256 nla_nest_end(skb, nest);
258 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
259 n_i >= TCA_ACT_MAX_PRIO)
264 cb->args[0] = index + 1;
266 mutex_unlock(&idrinfo->lock);
268 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
274 nla_nest_cancel(skb, nest);
278 static int tcf_idr_release_unsafe(struct tc_action *p)
280 if (atomic_read(&p->tcfa_bindcnt) > 0)
283 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
284 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
285 tcf_action_cleanup(p);
286 return ACT_P_DELETED;
292 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
293 const struct tc_action_ops *ops)
298 struct idr *idr = &idrinfo->action_idr;
300 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, 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)
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;
435 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
437 &p->tcfa_lock, NULL, est);
442 p->idrinfo = idrinfo;
447 free_percpu(p->cpu_qstats);
449 free_percpu(p->cpu_bstats_hw);
451 free_percpu(p->cpu_bstats);
456 EXPORT_SYMBOL(tcf_idr_create);
458 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
460 struct tcf_idrinfo *idrinfo = tn->idrinfo;
462 mutex_lock(&idrinfo->lock);
463 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
464 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
465 mutex_unlock(&idrinfo->lock);
467 EXPORT_SYMBOL(tcf_idr_insert);
469 /* Cleanup idr index that was allocated but not initialized. */
471 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
473 struct tcf_idrinfo *idrinfo = tn->idrinfo;
475 mutex_lock(&idrinfo->lock);
476 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
477 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
478 mutex_unlock(&idrinfo->lock);
480 EXPORT_SYMBOL(tcf_idr_cleanup);
482 /* Check if action with specified index exists. If actions is found, increments
483 * its reference and bind counters, and return 1. Otherwise insert temporary
484 * error pointer (to prevent concurrent users from inserting actions with same
485 * index) and return 0.
488 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
489 struct tc_action **a, int bind)
491 struct tcf_idrinfo *idrinfo = tn->idrinfo;
496 mutex_lock(&idrinfo->lock);
498 p = idr_find(&idrinfo->action_idr, *index);
500 /* This means that another process allocated
501 * index but did not assign the pointer yet.
503 mutex_unlock(&idrinfo->lock);
508 refcount_inc(&p->tcfa_refcnt);
510 atomic_inc(&p->tcfa_bindcnt);
515 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
518 idr_replace(&idrinfo->action_idr,
519 ERR_PTR(-EBUSY), *index);
524 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
525 UINT_MAX, GFP_KERNEL);
527 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
530 mutex_unlock(&idrinfo->lock);
533 EXPORT_SYMBOL(tcf_idr_check_alloc);
535 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
536 struct tcf_idrinfo *idrinfo)
538 struct idr *idr = &idrinfo->action_idr;
541 unsigned long id = 1;
543 idr_for_each_entry_ul(idr, p, id) {
544 ret = __tcf_idr_release(p, false, true);
545 if (ret == ACT_P_DELETED)
546 module_put(ops->owner);
550 idr_destroy(&idrinfo->action_idr);
552 EXPORT_SYMBOL(tcf_idrinfo_destroy);
554 static LIST_HEAD(act_base);
555 static DEFINE_RWLOCK(act_mod_lock);
557 int tcf_register_action(struct tc_action_ops *act,
558 struct pernet_operations *ops)
560 struct tc_action_ops *a;
563 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
566 /* We have to register pernet ops before making the action ops visible,
567 * otherwise tcf_action_init_1() could get a partially initialized
570 ret = register_pernet_subsys(ops);
574 write_lock(&act_mod_lock);
575 list_for_each_entry(a, &act_base, head) {
576 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
577 write_unlock(&act_mod_lock);
578 unregister_pernet_subsys(ops);
582 list_add_tail(&act->head, &act_base);
583 write_unlock(&act_mod_lock);
587 EXPORT_SYMBOL(tcf_register_action);
589 int tcf_unregister_action(struct tc_action_ops *act,
590 struct pernet_operations *ops)
592 struct tc_action_ops *a;
595 write_lock(&act_mod_lock);
596 list_for_each_entry(a, &act_base, head) {
598 list_del(&act->head);
603 write_unlock(&act_mod_lock);
605 unregister_pernet_subsys(ops);
608 EXPORT_SYMBOL(tcf_unregister_action);
611 static struct tc_action_ops *tc_lookup_action_n(char *kind)
613 struct tc_action_ops *a, *res = NULL;
616 read_lock(&act_mod_lock);
617 list_for_each_entry(a, &act_base, head) {
618 if (strcmp(kind, a->kind) == 0) {
619 if (try_module_get(a->owner))
624 read_unlock(&act_mod_lock);
629 /* lookup by nlattr */
630 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
632 struct tc_action_ops *a, *res = NULL;
635 read_lock(&act_mod_lock);
636 list_for_each_entry(a, &act_base, head) {
637 if (nla_strcmp(kind, a->kind) == 0) {
638 if (try_module_get(a->owner))
643 read_unlock(&act_mod_lock);
648 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
649 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
650 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
651 int nr_actions, struct tcf_result *res)
654 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
658 if (skb_skip_tc_classify(skb))
662 for (i = 0; i < nr_actions; i++) {
663 const struct tc_action *a = actions[i];
665 if (jmp_prgcnt > 0) {
670 ret = a->ops->act(skb, a, res);
671 if (ret == TC_ACT_REPEAT)
672 goto repeat; /* we need a ttl - JHS */
674 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
675 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
676 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
677 /* faulty opcode, stop pipeline */
682 goto restart_act_graph;
683 else /* faulty graph, stop pipeline */
686 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
687 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
688 net_warn_ratelimited("can't go to NULL chain!\n");
691 tcf_action_goto_chain_exec(a, res);
694 if (ret != TC_ACT_PIPE)
700 EXPORT_SYMBOL(tcf_action_exec);
702 int tcf_action_destroy(struct tc_action *actions[], int bind)
704 const struct tc_action_ops *ops;
708 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
712 ret = __tcf_idr_release(a, bind, true);
713 if (ret == ACT_P_DELETED)
714 module_put(ops->owner);
721 static int tcf_action_destroy_1(struct tc_action *a, int bind)
723 struct tc_action *actions[] = { a, NULL };
725 return tcf_action_destroy(actions, bind);
728 static int tcf_action_put(struct tc_action *p)
730 return __tcf_action_put(p, false);
733 /* Put all actions in this array, skip those NULL's. */
734 static void tcf_action_put_many(struct tc_action *actions[])
738 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
739 struct tc_action *a = actions[i];
740 const struct tc_action_ops *ops;
745 if (tcf_action_put(a))
746 module_put(ops->owner);
751 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
753 return a->ops->dump(skb, a, bind, ref);
757 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
760 unsigned char *b = skb_tail_pointer(skb);
762 struct tc_cookie *cookie;
764 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
765 goto nla_put_failure;
766 if (tcf_action_copy_stats(skb, a, 0))
767 goto nla_put_failure;
770 cookie = rcu_dereference(a->act_cookie);
772 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
774 goto nla_put_failure;
779 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
781 goto nla_put_failure;
782 err = tcf_action_dump_old(skb, a, bind, ref);
784 nla_nest_end(skb, nest);
792 EXPORT_SYMBOL(tcf_action_dump_1);
794 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
798 int err = -EINVAL, i;
801 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
803 nest = nla_nest_start_noflag(skb, a->order);
805 goto nla_put_failure;
806 err = tcf_action_dump_1(skb, a, bind, ref);
809 nla_nest_end(skb, nest);
817 nla_nest_cancel(skb, nest);
821 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
823 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
827 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
832 c->len = nla_len(tb[TCA_ACT_COOKIE]);
837 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
838 struct nlattr *nla, struct nlattr *est,
839 char *name, int ovr, int bind,
841 struct netlink_ext_ack *extack)
844 struct tc_action_ops *a_o;
845 struct tc_cookie *cookie = NULL;
846 char act_name[IFNAMSIZ];
847 struct nlattr *tb[TCA_ACT_MAX + 1];
852 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL,
857 kind = tb[TCA_ACT_KIND];
859 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
862 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
863 NL_SET_ERR_MSG(extack, "TC action name too long");
866 if (tb[TCA_ACT_COOKIE]) {
867 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
869 if (cklen > TC_COOKIE_MAX_SIZE) {
870 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
874 cookie = nla_memdup_cookie(tb);
876 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
882 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
883 NL_SET_ERR_MSG(extack, "TC action name too long");
889 a_o = tc_lookup_action_n(act_name);
891 #ifdef CONFIG_MODULES
894 request_module("act_%s", act_name);
898 a_o = tc_lookup_action_n(act_name);
900 /* We dropped the RTNL semaphore in order to
901 * perform the module load. So, even if we
902 * succeeded in loading the module we have to
903 * tell the caller to replay the request. We
904 * indicate this using -EAGAIN.
911 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
916 /* backward compatibility for policer */
918 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
919 rtnl_held, tp, extack);
921 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
926 if (!name && tb[TCA_ACT_COOKIE])
927 tcf_set_action_cookie(&a->act_cookie, cookie);
929 /* module count goes up only when brand new policy is created
930 * if it exists and is only bound to in a_o->init() then
931 * ACT_P_CREATED is not returned (a zero is).
933 if (err != ACT_P_CREATED)
934 module_put(a_o->owner);
936 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
937 !rcu_access_pointer(a->goto_chain)) {
938 tcf_action_destroy_1(a, bind);
939 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
940 return ERR_PTR(-EINVAL);
946 module_put(a_o->owner);
955 /* Returns numbers of initialized actions or negative error. */
957 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
958 struct nlattr *est, char *name, int ovr, int bind,
959 struct tc_action *actions[], size_t *attr_size,
960 bool rtnl_held, struct netlink_ext_ack *extack)
962 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
963 struct tc_action *act;
968 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
973 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
974 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
981 sz += tcf_action_fill_size(act);
982 /* Start from index 0 */
983 actions[i - 1] = act;
986 *attr_size = tcf_action_full_attrs_size(sz);
990 tcf_action_destroy(actions, bind);
994 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1003 /* compat_mode being true specifies a call that is supposed
1004 * to add additional backward compatibility statistic TLVs.
1007 if (p->type == TCA_OLD_COMPAT)
1008 err = gnet_stats_start_copy_compat(skb, 0,
1016 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1017 &p->tcfa_lock, &d, TCA_ACT_PAD);
1022 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1023 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1024 &p->tcfa_bstats_hw) < 0 ||
1025 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1026 gnet_stats_copy_queue(&d, p->cpu_qstats,
1028 p->tcfa_qstats.qlen) < 0)
1031 if (gnet_stats_finish_copy(&d) < 0)
1040 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1041 u32 portid, u32 seq, u16 flags, int event, int bind,
1045 struct nlmsghdr *nlh;
1046 unsigned char *b = skb_tail_pointer(skb);
1047 struct nlattr *nest;
1049 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1051 goto out_nlmsg_trim;
1052 t = nlmsg_data(nlh);
1053 t->tca_family = AF_UNSPEC;
1057 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1059 goto out_nlmsg_trim;
1061 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1062 goto out_nlmsg_trim;
1064 nla_nest_end(skb, nest);
1066 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1075 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1076 struct tc_action *actions[], int event,
1077 struct netlink_ext_ack *extack)
1079 struct sk_buff *skb;
1081 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1084 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1086 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1091 return rtnl_unicast(skb, net, portid);
1094 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1095 struct nlmsghdr *n, u32 portid,
1096 struct netlink_ext_ack *extack)
1098 struct nlattr *tb[TCA_ACT_MAX + 1];
1099 const struct tc_action_ops *ops;
1100 struct tc_action *a;
1104 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
1109 if (tb[TCA_ACT_INDEX] == NULL ||
1110 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1111 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1114 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1117 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1118 if (!ops) { /* could happen in batch of actions */
1119 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1123 if (ops->lookup(net, &a, index) == 0) {
1124 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1128 module_put(ops->owner);
1132 module_put(ops->owner);
1134 return ERR_PTR(err);
1137 static int tca_action_flush(struct net *net, struct nlattr *nla,
1138 struct nlmsghdr *n, u32 portid,
1139 struct netlink_ext_ack *extack)
1141 struct sk_buff *skb;
1143 struct nlmsghdr *nlh;
1145 struct netlink_callback dcb;
1146 struct nlattr *nest;
1147 struct nlattr *tb[TCA_ACT_MAX + 1];
1148 const struct tc_action_ops *ops;
1149 struct nlattr *kind;
1152 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1156 b = skb_tail_pointer(skb);
1158 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
1163 kind = tb[TCA_ACT_KIND];
1164 ops = tc_lookup_action(kind);
1165 if (!ops) { /*some idjot trying to flush unknown action */
1166 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1170 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1173 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1174 goto out_module_put;
1176 t = nlmsg_data(nlh);
1177 t->tca_family = AF_UNSPEC;
1181 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1183 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1184 goto out_module_put;
1187 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1189 nla_nest_cancel(skb, nest);
1190 goto out_module_put;
1193 nla_nest_end(skb, nest);
1195 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1196 nlh->nlmsg_flags |= NLM_F_ROOT;
1197 module_put(ops->owner);
1198 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1199 n->nlmsg_flags & NLM_F_ECHO);
1203 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1208 module_put(ops->owner);
1214 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1218 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1219 struct tc_action *a = actions[i];
1220 const struct tc_action_ops *ops = a->ops;
1221 /* Actions can be deleted concurrently so we must save their
1222 * type and id to search again after reference is released.
1224 struct tcf_idrinfo *idrinfo = a->idrinfo;
1225 u32 act_index = a->tcfa_index;
1228 if (tcf_action_put(a)) {
1229 /* last reference, action was deleted concurrently */
1230 module_put(ops->owner);
1234 /* now do the delete */
1235 ret = tcf_idr_delete_index(idrinfo, act_index);
1244 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1245 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1248 struct sk_buff *skb;
1250 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1255 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1257 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1262 /* now do the delete */
1263 ret = tcf_action_delete(net, actions);
1265 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1270 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1271 n->nlmsg_flags & NLM_F_ECHO);
1278 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1279 u32 portid, int event, struct netlink_ext_ack *extack)
1282 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1283 struct tc_action *act;
1284 size_t attr_size = 0;
1285 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1287 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1292 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1294 return tca_action_flush(net, tb[1], n, portid, extack);
1296 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1300 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1301 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1307 attr_size += tcf_action_fill_size(act);
1308 actions[i - 1] = act;
1311 attr_size = tcf_action_full_attrs_size(attr_size);
1313 if (event == RTM_GETACTION)
1314 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1316 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1322 tcf_action_put_many(actions);
1327 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1328 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1330 struct sk_buff *skb;
1333 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1338 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1339 RTM_NEWACTION, 0, 0) <= 0) {
1340 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1345 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1346 n->nlmsg_flags & NLM_F_ECHO);
1352 static int tcf_action_add(struct net *net, struct nlattr *nla,
1353 struct nlmsghdr *n, u32 portid, int ovr,
1354 struct netlink_ext_ack *extack)
1356 size_t attr_size = 0;
1358 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1360 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, actions,
1361 &attr_size, true, extack);
1364 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1366 tcf_action_put_many(actions);
1371 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1372 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1373 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1374 .validation_data = &tcaa_root_flags_allowed },
1375 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1378 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1379 struct netlink_ext_ack *extack)
1381 struct net *net = sock_net(skb->sk);
1382 struct nlattr *tca[TCA_ROOT_MAX + 1];
1383 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1384 int ret = 0, ovr = 0;
1386 if ((n->nlmsg_type != RTM_GETACTION) &&
1387 !netlink_capable(skb, CAP_NET_ADMIN))
1390 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1391 TCA_ROOT_MAX, NULL, extack);
1395 if (tca[TCA_ACT_TAB] == NULL) {
1396 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1400 /* n->nlmsg_flags & NLM_F_CREATE */
1401 switch (n->nlmsg_type) {
1403 /* we are going to assume all other flags
1404 * imply create only if it doesn't exist
1405 * Note that CREATE | EXCL implies that
1406 * but since we want avoid ambiguity (eg when flags
1407 * is zero) then just set this
1409 if (n->nlmsg_flags & NLM_F_REPLACE)
1412 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1418 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1419 portid, RTM_DELACTION, extack);
1422 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1423 portid, RTM_GETACTION, extack);
1432 static struct nlattr *find_dump_kind(struct nlattr **nla)
1434 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1435 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1436 struct nlattr *kind;
1438 tb1 = nla[TCA_ACT_TAB];
1442 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1447 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1449 kind = tb2[TCA_ACT_KIND];
1454 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1456 struct net *net = sock_net(skb->sk);
1457 struct nlmsghdr *nlh;
1458 unsigned char *b = skb_tail_pointer(skb);
1459 struct nlattr *nest;
1460 struct tc_action_ops *a_o;
1462 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1463 struct nlattr *tb[TCA_ROOT_MAX + 1];
1464 struct nlattr *count_attr = NULL;
1465 unsigned long jiffy_since = 0;
1466 struct nlattr *kind = NULL;
1467 struct nla_bitfield32 bf;
1468 u32 msecs_since = 0;
1471 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1472 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1476 kind = find_dump_kind(tb);
1478 pr_info("tc_dump_action: action bad kind\n");
1482 a_o = tc_lookup_action(kind);
1487 if (tb[TCA_ROOT_FLAGS]) {
1488 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1489 cb->args[2] = bf.value;
1492 if (tb[TCA_ROOT_TIME_DELTA]) {
1493 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1496 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1497 cb->nlh->nlmsg_type, sizeof(*t), 0);
1499 goto out_module_put;
1502 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1504 t = nlmsg_data(nlh);
1505 t->tca_family = AF_UNSPEC;
1508 cb->args[3] = jiffy_since;
1509 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1511 goto out_module_put;
1513 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1515 goto out_module_put;
1517 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1519 goto out_module_put;
1522 nla_nest_end(skb, nest);
1524 act_count = cb->args[1];
1525 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1530 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1531 if (NETLINK_CB(cb->skb).portid && ret)
1532 nlh->nlmsg_flags |= NLM_F_MULTI;
1533 module_put(a_o->owner);
1537 module_put(a_o->owner);
1542 static int __init tc_action_init(void)
1544 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1545 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1546 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1552 subsys_initcall(tc_action_init);