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/tc_act/tc_pedit.h>
23 #include <net/act_api.h>
24 #include <net/netlink.h>
25 #include <net/flow_offload.h>
26 #include <net/tc_wrapper.h>
29 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
33 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
36 if (static_branch_unlikely(&tcf_frag_xmit_count))
37 return sch_frag_xmit_hook(skb, xmit);
42 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
44 static void tcf_action_goto_chain_exec(const struct tc_action *a,
45 struct tcf_result *res)
47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
49 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
52 static void tcf_free_cookie_rcu(struct rcu_head *p)
54 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
60 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
61 struct tc_cookie *new_cookie)
63 struct tc_cookie *old;
65 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
70 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
71 struct tcf_chain **newchain,
72 struct netlink_ext_ack *extack)
74 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
78 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
79 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
82 NL_SET_ERR_MSG(extack, "invalid control action");
86 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
87 chain_index = action & TC_ACT_EXT_VAL_MASK;
88 if (!tp || !newchain) {
90 NL_SET_ERR_MSG(extack,
91 "can't goto NULL proto/chain");
94 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
97 NL_SET_ERR_MSG(extack,
98 "can't allocate goto_chain");
104 EXPORT_SYMBOL(tcf_action_check_ctrlact);
106 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
107 struct tcf_chain *goto_chain)
109 a->tcfa_action = action;
110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
113 EXPORT_SYMBOL(tcf_action_set_ctrlact);
115 /* XXX: For standalone actions, we don't need a RCU grace period either, because
116 * actions are always connected to filters and filters are already destroyed in
117 * RCU callbacks, so after a RCU grace period actions are already disconnected
118 * from filters. Readers later can not find us.
120 static void free_tcf(struct tc_action *p)
122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
124 free_percpu(p->cpu_bstats);
125 free_percpu(p->cpu_bstats_hw);
126 free_percpu(p->cpu_qstats);
128 tcf_set_action_cookie(&p->user_cookie, NULL);
130 tcf_chain_put_by_act(chain);
135 static void offload_action_hw_count_set(struct tc_action *act,
138 act->in_hw_count = hw_count;
141 static void offload_action_hw_count_inc(struct tc_action *act,
144 act->in_hw_count += hw_count;
147 static void offload_action_hw_count_dec(struct tc_action *act,
150 act->in_hw_count = act->in_hw_count > hw_count ?
151 act->in_hw_count - hw_count : 0;
154 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
156 if (is_tcf_pedit(act))
157 return tcf_pedit_nkeys(act);
162 static bool tc_act_skip_hw(u32 flags)
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
167 static bool tc_act_skip_sw(u32 flags)
169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
172 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
173 static bool tc_act_flags_valid(u32 flags)
175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
180 static int offload_action_init(struct flow_offload_action *fl_action,
181 struct tc_action *act,
182 enum offload_act_command cmd,
183 struct netlink_ext_ack *extack)
187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
190 fl_action->cookie = (unsigned long)act;
192 if (act->ops->offload_act_setup) {
193 spin_lock_bh(&act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
196 spin_unlock_bh(&act->tcfa_lock);
203 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
208 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
219 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
221 flow_indr_block_bind_cb_t *cb,
226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
236 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
238 flow_indr_block_bind_cb_t *cb,
241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
243 tcf_action_offload_cmd_ex(fl_act, hw_count);
246 static int tcf_action_offload_add_ex(struct tc_action *action,
247 struct netlink_ext_ack *extack,
248 flow_indr_block_bind_cb_t *cb,
251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
255 struct flow_offload_action *fl_action;
259 if (tc_act_skip_hw(action->tcfa_flags))
262 num = tcf_offload_act_num_actions_single(action);
263 fl_action = offload_action_alloc(num);
267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
271 err = tc_setup_action(&fl_action->action, actions, 0, extack);
273 NL_SET_ERR_MSG_MOD(extack,
274 "Failed to setup tc actions for offload");
278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
283 if (skip_sw && !tc_act_in_hw(action))
286 tc_cleanup_offload_action(&fl_action->action);
294 /* offload the tc action after it is inserted */
295 static int tcf_action_offload_add(struct tc_action *action,
296 struct netlink_ext_ack *extack)
298 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
301 int tcf_action_update_hw_stats(struct tc_action *action)
303 struct flow_offload_action fl_act = {};
306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
313 tcf_action_stats_update(action, fl_act.stats.bytes,
316 fl_act.stats.lastused,
319 action->used_hw_stats = fl_act.stats.used_hw_stats;
320 action->used_hw_stats_valid = true;
327 EXPORT_SYMBOL(tcf_action_update_hw_stats);
329 static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
333 struct flow_offload_action fl_act = {};
337 if (!tc_act_in_hw(action))
340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
348 if (!cb && action->in_hw_count != in_hw_count)
351 /* do not need to update hw state when deleting action */
352 if (cb && in_hw_count)
353 offload_action_hw_count_dec(action, in_hw_count);
358 static int tcf_action_offload_del(struct tc_action *action)
360 return tcf_action_offload_del_ex(action, NULL, NULL);
363 static void tcf_action_cleanup(struct tc_action *p)
365 tcf_action_offload_del(p);
369 gen_kill_estimator(&p->tcfa_rate_est);
373 static int __tcf_action_put(struct tc_action *p, bool bind)
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
381 mutex_unlock(&idrinfo->lock);
383 tcf_action_cleanup(p);
388 atomic_dec(&p->tcfa_bindcnt);
393 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
397 /* Release with strict==1 and bind==0 is only called through act API
398 * interface (classifiers always bind). Only case when action with
399 * positive reference count and zero bind count can exist is when it was
400 * also created with act API (unbinding last classifier will destroy the
401 * action if it was created by classifier). So only case when bind count
402 * can be changed after initial check is when unbound action is
403 * destroyed by act API while classifier binds to action with same id
404 * concurrently. This result either creation of new action(same behavior
405 * as before), or reusing existing action if concurrent process
406 * increments reference count before action is deleted. Both scenarios
410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
413 if (__tcf_action_put(p, bind))
420 int tcf_idr_release(struct tc_action *a, bool bind)
422 const struct tc_action_ops *ops = a->ops;
425 ret = __tcf_idr_release(a, bind, false);
426 if (ret == ACT_P_DELETED)
427 module_put(ops->owner);
430 EXPORT_SYMBOL(tcf_idr_release);
432 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
434 struct tc_cookie *user_cookie;
438 user_cookie = rcu_dereference(act->user_cookie);
441 cookie_len = nla_total_size(user_cookie->len);
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(0) /* TCA_ACT_STATS nested */
449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
460 static size_t tcf_action_full_attrs_size(size_t sz)
462 return NLMSG_HDRLEN /* struct nlmsghdr */
463 + sizeof(struct tcamsg)
464 + nla_total_size(0) /* TCA_ACT_TAB nested */
468 static size_t tcf_action_fill_size(const struct tc_action *act)
470 size_t sz = tcf_action_shared_attrs_size(act);
472 if (act->ops->get_fill_size)
473 return act->ops->get_fill_size(act) + sz;
478 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
480 unsigned char *b = skb_tail_pointer(skb);
481 struct tc_cookie *cookie;
483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
484 goto nla_put_failure;
485 if (tcf_action_copy_stats(skb, a, 0))
486 goto nla_put_failure;
487 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
488 goto nla_put_failure;
491 cookie = rcu_dereference(a->user_cookie);
493 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
495 goto nla_put_failure;
507 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
508 struct netlink_callback *cb)
510 int err = 0, index = -1, s_i = 0, n_i = 0;
511 u32 act_flags = cb->args[2];
512 unsigned long jiffy_since = cb->args[3];
514 struct idr *idr = &idrinfo->action_idr;
516 unsigned long id = 1;
519 mutex_lock(&idrinfo->lock);
523 idr_for_each_entry_ul(idr, p, tmp, id) {
531 time_after(jiffy_since,
532 (unsigned long)p->tcfa_tm.lastuse))
535 tcf_action_update_hw_stats(p);
537 nest = nla_nest_start_noflag(skb, n_i);
540 goto nla_put_failure;
542 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
543 tcf_action_dump_terse(skb, p, true) :
544 tcf_action_dump_1(skb, p, 0, 0);
547 nlmsg_trim(skb, nest);
550 nla_nest_end(skb, nest);
552 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
553 n_i >= TCA_ACT_MAX_PRIO)
558 cb->args[0] = index + 1;
560 mutex_unlock(&idrinfo->lock);
562 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
568 nla_nest_cancel(skb, nest);
572 static int tcf_idr_release_unsafe(struct tc_action *p)
574 if (atomic_read(&p->tcfa_bindcnt) > 0)
577 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
578 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
579 tcf_action_cleanup(p);
580 return ACT_P_DELETED;
586 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
587 const struct tc_action_ops *ops,
588 struct netlink_ext_ack *extack)
593 struct idr *idr = &idrinfo->action_idr;
595 unsigned long id = 1;
598 nest = nla_nest_start_noflag(skb, 0);
600 goto nla_put_failure;
601 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
602 goto nla_put_failure;
605 mutex_lock(&idrinfo->lock);
606 idr_for_each_entry_ul(idr, p, tmp, id) {
609 ret = tcf_idr_release_unsafe(p);
610 if (ret == ACT_P_DELETED)
611 module_put(ops->owner);
616 mutex_unlock(&idrinfo->lock);
619 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
621 goto nla_put_failure;
624 ret = nla_put_u32(skb, TCA_FCNT, n_i);
626 goto nla_put_failure;
627 nla_nest_end(skb, nest);
631 nla_nest_cancel(skb, nest);
635 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
636 struct netlink_callback *cb, int type,
637 const struct tc_action_ops *ops,
638 struct netlink_ext_ack *extack)
640 struct tcf_idrinfo *idrinfo = tn->idrinfo;
642 if (type == RTM_DELACTION) {
643 return tcf_del_walker(idrinfo, skb, ops, extack);
644 } else if (type == RTM_GETACTION) {
645 return tcf_dump_walker(idrinfo, skb, cb);
647 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
648 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
652 EXPORT_SYMBOL(tcf_generic_walker);
654 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
656 struct tcf_idrinfo *idrinfo = tn->idrinfo;
659 mutex_lock(&idrinfo->lock);
660 p = idr_find(&idrinfo->action_idr, index);
664 refcount_inc(&p->tcfa_refcnt);
665 mutex_unlock(&idrinfo->lock);
673 EXPORT_SYMBOL(tcf_idr_search);
675 static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
676 struct netlink_callback *cb, int type,
677 const struct tc_action_ops *ops,
678 struct netlink_ext_ack *extack)
680 struct tc_action_net *tn = net_generic(net, ops->net_id);
682 if (unlikely(ops->walk))
683 return ops->walk(net, skb, cb, type, ops, extack);
685 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
688 static int __tcf_idr_search(struct net *net,
689 const struct tc_action_ops *ops,
690 struct tc_action **a, u32 index)
692 struct tc_action_net *tn = net_generic(net, ops->net_id);
694 if (unlikely(ops->lookup))
695 return ops->lookup(net, a, index);
697 return tcf_idr_search(tn, a, index);
700 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
705 mutex_lock(&idrinfo->lock);
706 p = idr_find(&idrinfo->action_idr, index);
708 mutex_unlock(&idrinfo->lock);
712 if (!atomic_read(&p->tcfa_bindcnt)) {
713 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
714 struct module *owner = p->ops->owner;
716 WARN_ON(p != idr_remove(&idrinfo->action_idr,
718 mutex_unlock(&idrinfo->lock);
720 tcf_action_cleanup(p);
729 mutex_unlock(&idrinfo->lock);
733 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
734 struct tc_action **a, const struct tc_action_ops *ops,
735 int bind, bool cpustats, u32 flags)
737 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
738 struct tcf_idrinfo *idrinfo = tn->idrinfo;
743 refcount_set(&p->tcfa_refcnt, 1);
745 atomic_set(&p->tcfa_bindcnt, 1);
748 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
751 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
752 if (!p->cpu_bstats_hw)
754 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
758 gnet_stats_basic_sync_init(&p->tcfa_bstats);
759 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
760 spin_lock_init(&p->tcfa_lock);
761 p->tcfa_index = index;
762 p->tcfa_tm.install = jiffies;
763 p->tcfa_tm.lastuse = jiffies;
764 p->tcfa_tm.firstuse = 0;
765 p->tcfa_flags = flags;
767 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
769 &p->tcfa_lock, false, est);
774 p->idrinfo = idrinfo;
775 __module_get(ops->owner);
780 free_percpu(p->cpu_qstats);
782 free_percpu(p->cpu_bstats_hw);
784 free_percpu(p->cpu_bstats);
789 EXPORT_SYMBOL(tcf_idr_create);
791 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
792 struct nlattr *est, struct tc_action **a,
793 const struct tc_action_ops *ops, int bind,
796 /* Set cpustats according to actions flags. */
797 return tcf_idr_create(tn, index, est, a, ops, bind,
798 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
800 EXPORT_SYMBOL(tcf_idr_create_from_flags);
802 /* Cleanup idr index that was allocated but not initialized. */
804 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
806 struct tcf_idrinfo *idrinfo = tn->idrinfo;
808 mutex_lock(&idrinfo->lock);
809 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
810 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
811 mutex_unlock(&idrinfo->lock);
813 EXPORT_SYMBOL(tcf_idr_cleanup);
815 /* Check if action with specified index exists. If actions is found, increments
816 * its reference and bind counters, and return 1. Otherwise insert temporary
817 * error pointer (to prevent concurrent users from inserting actions with same
818 * index) and return 0.
820 * May return -EAGAIN for binding actions in case of a parallel add/delete on
821 * the requested index.
824 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
825 struct tc_action **a, int bind)
827 struct tcf_idrinfo *idrinfo = tn->idrinfo;
835 p = idr_find(&idrinfo->action_idr, *index);
838 /* This means that another process allocated
839 * index but did not assign the pointer yet.
846 /* Empty slot, try to allocate it */
852 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
853 /* Action was deleted in parallel */
859 atomic_inc(&p->tcfa_bindcnt);
874 mutex_lock(&idrinfo->lock);
875 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
877 mutex_unlock(&idrinfo->lock);
879 /* N binds raced for action allocation,
880 * retry for all the ones that failed.
882 if (ret == -ENOSPC && *index == max)
887 EXPORT_SYMBOL(tcf_idr_check_alloc);
889 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
890 struct tcf_idrinfo *idrinfo)
892 struct idr *idr = &idrinfo->action_idr;
895 unsigned long id = 1;
898 idr_for_each_entry_ul(idr, p, tmp, id) {
899 ret = __tcf_idr_release(p, false, true);
900 if (ret == ACT_P_DELETED)
901 module_put(ops->owner);
905 idr_destroy(&idrinfo->action_idr);
907 EXPORT_SYMBOL(tcf_idrinfo_destroy);
909 static LIST_HEAD(act_base);
910 static DEFINE_RWLOCK(act_mod_lock);
911 /* since act ops id is stored in pernet subsystem list,
912 * then there is no way to walk through only all the action
913 * subsystem, so we keep tc action pernet ops id for
914 * reoffload to walk through.
916 static LIST_HEAD(act_pernet_id_list);
917 static DEFINE_MUTEX(act_id_mutex);
918 struct tc_act_pernet_id {
919 struct list_head list;
923 static int tcf_pernet_add_id_list(unsigned int id)
925 struct tc_act_pernet_id *id_ptr;
928 mutex_lock(&act_id_mutex);
929 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
930 if (id_ptr->id == id) {
936 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
943 list_add_tail(&id_ptr->list, &act_pernet_id_list);
946 mutex_unlock(&act_id_mutex);
950 static void tcf_pernet_del_id_list(unsigned int id)
952 struct tc_act_pernet_id *id_ptr;
954 mutex_lock(&act_id_mutex);
955 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
956 if (id_ptr->id == id) {
957 list_del(&id_ptr->list);
962 mutex_unlock(&act_id_mutex);
965 int tcf_register_action(struct tc_action_ops *act,
966 struct pernet_operations *ops)
968 struct tc_action_ops *a;
971 if (!act->act || !act->dump || !act->init)
974 /* We have to register pernet ops before making the action ops visible,
975 * otherwise tcf_action_init_1() could get a partially initialized
978 ret = register_pernet_subsys(ops);
983 ret = tcf_pernet_add_id_list(*ops->id);
988 write_lock(&act_mod_lock);
989 list_for_each_entry(a, &act_base, head) {
990 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
995 list_add_tail(&act->head, &act_base);
996 write_unlock(&act_mod_lock);
1001 write_unlock(&act_mod_lock);
1003 tcf_pernet_del_id_list(*ops->id);
1005 unregister_pernet_subsys(ops);
1008 EXPORT_SYMBOL(tcf_register_action);
1010 int tcf_unregister_action(struct tc_action_ops *act,
1011 struct pernet_operations *ops)
1013 struct tc_action_ops *a;
1016 write_lock(&act_mod_lock);
1017 list_for_each_entry(a, &act_base, head) {
1019 list_del(&act->head);
1024 write_unlock(&act_mod_lock);
1026 unregister_pernet_subsys(ops);
1028 tcf_pernet_del_id_list(*ops->id);
1032 EXPORT_SYMBOL(tcf_unregister_action);
1034 /* lookup by name */
1035 static struct tc_action_ops *tc_lookup_action_n(char *kind)
1037 struct tc_action_ops *a, *res = NULL;
1040 read_lock(&act_mod_lock);
1041 list_for_each_entry(a, &act_base, head) {
1042 if (strcmp(kind, a->kind) == 0) {
1043 if (try_module_get(a->owner))
1048 read_unlock(&act_mod_lock);
1053 /* lookup by nlattr */
1054 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1056 struct tc_action_ops *a, *res = NULL;
1059 read_lock(&act_mod_lock);
1060 list_for_each_entry(a, &act_base, head) {
1061 if (nla_strcmp(kind, a->kind) == 0) {
1062 if (try_module_get(a->owner))
1067 read_unlock(&act_mod_lock);
1072 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1073 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
1074 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1075 int nr_actions, struct tcf_result *res)
1078 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1080 int ret = TC_ACT_OK;
1082 if (skb_skip_tc_classify(skb))
1086 for (i = 0; i < nr_actions; i++) {
1087 const struct tc_action *a = actions[i];
1090 if (jmp_prgcnt > 0) {
1095 if (tc_act_skip_sw(a->tcfa_flags))
1100 ret = tc_act(skb, a, res);
1101 if (unlikely(ret == TC_ACT_REPEAT)) {
1102 if (--repeat_ttl != 0)
1104 /* suspicious opcode, stop pipeline */
1105 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1108 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1109 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1110 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1111 /* faulty opcode, stop pipeline */
1116 goto restart_act_graph;
1117 else /* faulty graph, stop pipeline */
1120 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1121 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1122 tcf_set_drop_reason(skb,
1123 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1126 tcf_action_goto_chain_exec(a, res);
1129 if (ret != TC_ACT_PIPE)
1135 EXPORT_SYMBOL(tcf_action_exec);
1137 int tcf_action_destroy(struct tc_action *actions[], int bind)
1139 const struct tc_action_ops *ops;
1140 struct tc_action *a;
1143 tcf_act_for_each_action(i, a, actions) {
1146 ret = __tcf_idr_release(a, bind, true);
1147 if (ret == ACT_P_DELETED)
1148 module_put(ops->owner);
1155 static int tcf_action_put(struct tc_action *p)
1157 return __tcf_action_put(p, false);
1160 static void tcf_action_put_many(struct tc_action *actions[])
1162 struct tc_action *a;
1165 tcf_act_for_each_action(i, a, actions) {
1166 const struct tc_action_ops *ops = a->ops;
1167 if (tcf_action_put(a))
1168 module_put(ops->owner);
1172 static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1174 struct tc_action *a;
1177 tcf_act_for_each_action(i, a, actions) {
1178 const struct tc_action_ops *ops = a->ops;
1180 if (init_res[i] == ACT_P_CREATED)
1183 if (tcf_action_put(a))
1184 module_put(ops->owner);
1189 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1191 return a->ops->dump(skb, a, bind, ref);
1195 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1198 unsigned char *b = skb_tail_pointer(skb);
1199 struct nlattr *nest;
1202 if (tcf_action_dump_terse(skb, a, false))
1203 goto nla_put_failure;
1205 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1206 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1207 a->hw_stats, TCA_ACT_HW_STATS_ANY))
1208 goto nla_put_failure;
1210 if (a->used_hw_stats_valid &&
1211 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1212 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1213 goto nla_put_failure;
1215 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1217 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1219 goto nla_put_failure;
1221 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1222 goto nla_put_failure;
1224 nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
1226 goto nla_put_failure;
1227 err = tcf_action_dump_old(skb, a, bind, ref);
1229 nla_nest_end(skb, nest);
1237 EXPORT_SYMBOL(tcf_action_dump_1);
1239 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1240 int bind, int ref, bool terse)
1242 struct tc_action *a;
1243 int err = -EINVAL, i;
1244 struct nlattr *nest;
1246 tcf_act_for_each_action(i, a, actions) {
1247 nest = nla_nest_start_noflag(skb, i + 1);
1249 goto nla_put_failure;
1250 err = terse ? tcf_action_dump_terse(skb, a, false) :
1251 tcf_action_dump_1(skb, a, bind, ref);
1254 nla_nest_end(skb, nest);
1262 nla_nest_cancel(skb, nest);
1266 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1268 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1272 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1277 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1282 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1284 struct nla_bitfield32 hw_stats_bf;
1286 /* If the user did not pass the attr, that means he does
1287 * not care about the type. Return "any" in that case
1288 * which is setting on all supported types.
1291 return TCA_ACT_HW_STATS_ANY;
1292 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1293 return hw_stats_bf.value;
1296 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1297 [TCA_ACT_KIND] = { .type = NLA_STRING },
1298 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1299 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1300 .len = TC_COOKIE_MAX_SIZE },
1301 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1302 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1303 TCA_ACT_FLAGS_SKIP_HW |
1304 TCA_ACT_FLAGS_SKIP_SW),
1305 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1308 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1310 struct tc_action *a;
1313 tcf_act_for_each_action(i, a, actions) {
1314 struct tcf_idrinfo *idrinfo;
1316 if (init_res[i] == ACT_P_BOUND)
1319 idrinfo = a->idrinfo;
1320 mutex_lock(&idrinfo->lock);
1321 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1322 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1323 mutex_unlock(&idrinfo->lock);
1327 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1328 struct netlink_ext_ack *extack)
1330 bool police = flags & TCA_ACT_FLAGS_POLICE;
1331 struct nlattr *tb[TCA_ACT_MAX + 1];
1332 struct tc_action_ops *a_o;
1333 char act_name[IFNAMSIZ];
1334 struct nlattr *kind;
1338 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1339 tcf_action_policy, extack);
1341 return ERR_PTR(err);
1343 kind = tb[TCA_ACT_KIND];
1345 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1346 return ERR_PTR(err);
1348 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1349 NL_SET_ERR_MSG(extack, "TC action name too long");
1350 return ERR_PTR(err);
1353 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1354 NL_SET_ERR_MSG(extack, "TC action name too long");
1355 return ERR_PTR(-EINVAL);
1359 a_o = tc_lookup_action_n(act_name);
1361 #ifdef CONFIG_MODULES
1362 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1366 request_module("act_%s", act_name);
1370 a_o = tc_lookup_action_n(act_name);
1372 /* We dropped the RTNL semaphore in order to
1373 * perform the module load. So, even if we
1374 * succeeded in loading the module we have to
1375 * tell the caller to replay the request. We
1376 * indicate this using -EAGAIN.
1379 module_put(a_o->owner);
1380 return ERR_PTR(-EAGAIN);
1383 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1384 return ERR_PTR(-ENOENT);
1390 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1391 struct nlattr *nla, struct nlattr *est,
1392 struct tc_action_ops *a_o, int *init_res,
1393 u32 flags, struct netlink_ext_ack *extack)
1395 bool police = flags & TCA_ACT_FLAGS_POLICE;
1396 struct nla_bitfield32 userflags = { 0, 0 };
1397 struct tc_cookie *user_cookie = NULL;
1398 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1399 struct nlattr *tb[TCA_ACT_MAX + 1];
1400 struct tc_action *a;
1403 /* backward compatibility for policer */
1405 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1406 tcf_action_policy, extack);
1408 return ERR_PTR(err);
1409 if (tb[TCA_ACT_COOKIE]) {
1410 user_cookie = nla_memdup_cookie(tb);
1412 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1417 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1418 if (tb[TCA_ACT_FLAGS]) {
1419 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1420 if (!tc_act_flags_valid(userflags.value)) {
1426 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1427 userflags.value | flags, extack);
1429 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1436 if (!police && tb[TCA_ACT_COOKIE])
1437 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1440 a->hw_stats = hw_stats;
1446 kfree(user_cookie->data);
1449 return ERR_PTR(err);
1452 static bool tc_act_bind(u32 flags)
1454 return !!(flags & TCA_ACT_FLAGS_BIND);
1457 /* Returns numbers of initialized actions or negative error. */
1459 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1460 struct nlattr *est, struct tc_action *actions[],
1461 int init_res[], size_t *attr_size,
1462 u32 flags, u32 fl_flags,
1463 struct netlink_ext_ack *extack)
1465 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1466 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1467 struct tc_action *act;
1472 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1477 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1478 struct tc_action_ops *a_o;
1480 a_o = tc_action_load_ops(tb[i], flags, extack);
1488 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1489 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1490 &init_res[i - 1], flags, extack);
1495 sz += tcf_action_fill_size(act);
1496 /* Start from index 0 */
1497 actions[i - 1] = act;
1498 if (tc_act_bind(flags)) {
1499 bool skip_sw = tc_skip_sw(fl_flags);
1500 bool skip_hw = tc_skip_hw(fl_flags);
1502 if (tc_act_bind(act->tcfa_flags))
1504 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1505 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1506 NL_SET_ERR_MSG(extack,
1507 "Mismatch between action and filter offload flags");
1512 err = tcf_action_offload_add(act, extack);
1513 if (tc_act_skip_sw(act->tcfa_flags) && err)
1518 /* We have to commit them all together, because if any error happened in
1519 * between, we could not handle the failure gracefully.
1521 tcf_idr_insert_many(actions, init_res);
1523 *attr_size = tcf_action_full_attrs_size(sz);
1528 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1530 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1531 module_put(ops[i]->owner);
1535 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1538 if (a->cpu_bstats) {
1539 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1541 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1544 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1549 _bstats_update(&a->tcfa_bstats, bytes, packets);
1550 a->tcfa_qstats.drops += drops;
1552 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1554 EXPORT_SYMBOL(tcf_action_update_stats);
1556 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1565 /* compat_mode being true specifies a call that is supposed
1566 * to add additional backward compatibility statistic TLVs.
1569 if (p->type == TCA_OLD_COMPAT)
1570 err = gnet_stats_start_copy_compat(skb, 0,
1578 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1579 &p->tcfa_lock, &d, TCA_ACT_PAD);
1584 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1585 &p->tcfa_bstats, false) < 0 ||
1586 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1587 &p->tcfa_bstats_hw, false) < 0 ||
1588 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1589 gnet_stats_copy_queue(&d, p->cpu_qstats,
1591 p->tcfa_qstats.qlen) < 0)
1594 if (gnet_stats_finish_copy(&d) < 0)
1603 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1604 u32 portid, u32 seq, u16 flags, int event, int bind,
1605 int ref, struct netlink_ext_ack *extack)
1608 struct nlmsghdr *nlh;
1609 unsigned char *b = skb_tail_pointer(skb);
1610 struct nlattr *nest;
1612 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1614 goto out_nlmsg_trim;
1615 t = nlmsg_data(nlh);
1616 t->tca_family = AF_UNSPEC;
1620 if (extack && extack->_msg &&
1621 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1622 goto out_nlmsg_trim;
1624 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1626 goto out_nlmsg_trim;
1628 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1629 goto out_nlmsg_trim;
1631 nla_nest_end(skb, nest);
1633 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1643 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1644 struct tc_action *actions[], int event,
1645 struct netlink_ext_ack *extack)
1647 struct sk_buff *skb;
1649 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1652 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1654 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1659 return rtnl_unicast(skb, net, portid);
1662 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1663 struct nlmsghdr *n, u32 portid,
1664 struct netlink_ext_ack *extack)
1666 struct nlattr *tb[TCA_ACT_MAX + 1];
1667 const struct tc_action_ops *ops;
1668 struct tc_action *a;
1672 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1673 tcf_action_policy, extack);
1678 if (tb[TCA_ACT_INDEX] == NULL ||
1679 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1680 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1683 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1686 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1687 if (!ops) { /* could happen in batch of actions */
1688 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1692 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1693 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1697 module_put(ops->owner);
1701 module_put(ops->owner);
1703 return ERR_PTR(err);
1706 static int tca_action_flush(struct net *net, struct nlattr *nla,
1707 struct nlmsghdr *n, u32 portid,
1708 struct netlink_ext_ack *extack)
1710 struct sk_buff *skb;
1712 struct nlmsghdr *nlh;
1714 struct netlink_callback dcb;
1715 struct nlattr *nest;
1716 struct nlattr *tb[TCA_ACT_MAX + 1];
1717 const struct tc_action_ops *ops;
1718 struct nlattr *kind;
1721 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1725 b = skb_tail_pointer(skb);
1727 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1728 tcf_action_policy, extack);
1733 kind = tb[TCA_ACT_KIND];
1734 ops = tc_lookup_action(kind);
1735 if (!ops) { /*some idjot trying to flush unknown action */
1736 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1740 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1743 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1744 goto out_module_put;
1746 t = nlmsg_data(nlh);
1747 t->tca_family = AF_UNSPEC;
1751 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1753 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1754 goto out_module_put;
1757 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1759 nla_nest_cancel(skb, nest);
1760 goto out_module_put;
1763 nla_nest_end(skb, nest);
1765 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1766 nlh->nlmsg_flags |= NLM_F_ROOT;
1767 module_put(ops->owner);
1768 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1769 n->nlmsg_flags & NLM_F_ECHO);
1771 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1776 module_put(ops->owner);
1782 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1784 struct tc_action *a;
1787 tcf_act_for_each_action(i, a, actions) {
1788 const struct tc_action_ops *ops = a->ops;
1789 /* Actions can be deleted concurrently so we must save their
1790 * type and id to search again after reference is released.
1792 struct tcf_idrinfo *idrinfo = a->idrinfo;
1793 u32 act_index = a->tcfa_index;
1796 if (tcf_action_put(a)) {
1797 /* last reference, action was deleted concurrently */
1798 module_put(ops->owner);
1802 /* now do the delete */
1803 ret = tcf_idr_delete_index(idrinfo, act_index);
1811 static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1812 struct tc_action *action)
1814 size_t attr_size = tcf_action_fill_size(action);
1815 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1818 struct sk_buff *skb;
1820 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1822 return ERR_PTR(-ENOBUFS);
1824 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1826 return ERR_PTR(-EINVAL);
1832 static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1834 const struct tc_action_ops *ops = action->ops;
1835 struct sk_buff *skb;
1838 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1841 skb = tcf_reoffload_del_notify_msg(net, action);
1843 return PTR_ERR(skb);
1846 ret = tcf_idr_release_unsafe(action);
1847 if (ret == ACT_P_DELETED) {
1848 module_put(ops->owner);
1849 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
1857 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1858 void *cb_priv, bool add)
1860 struct tc_act_pernet_id *id_ptr;
1861 struct tcf_idrinfo *idrinfo;
1862 struct tc_action_net *tn;
1863 struct tc_action *p;
1864 unsigned int act_id;
1874 down_read(&net_rwsem);
1875 mutex_lock(&act_id_mutex);
1878 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1879 act_id = id_ptr->id;
1880 tn = net_generic(net, act_id);
1883 idrinfo = tn->idrinfo;
1887 mutex_lock(&idrinfo->lock);
1888 idr = &idrinfo->action_idr;
1889 idr_for_each_entry_ul(idr, p, tmp, id) {
1890 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1893 tcf_action_offload_add_ex(p, NULL, cb,
1898 /* cb unregister to update hw count */
1899 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1902 if (tc_act_skip_sw(p->tcfa_flags) &&
1904 tcf_reoffload_del_notify(net, p);
1906 mutex_unlock(&idrinfo->lock);
1909 mutex_unlock(&act_id_mutex);
1910 up_read(&net_rwsem);
1915 static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1916 struct tc_action *actions[],
1917 u32 portid, size_t attr_size,
1918 struct netlink_ext_ack *extack)
1920 struct sk_buff *skb;
1922 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1924 return ERR_PTR(-ENOBUFS);
1926 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1927 0, 2, extack) <= 0) {
1928 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1930 return ERR_PTR(-EINVAL);
1936 static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1937 struct tc_action *actions[], u32 portid,
1938 size_t attr_size, struct netlink_ext_ack *extack)
1940 struct sk_buff *skb;
1943 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1946 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1949 return PTR_ERR(skb);
1952 /* now do the delete */
1953 ret = tcf_action_delete(net, actions);
1955 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1960 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1961 n->nlmsg_flags & NLM_F_ECHO);
1965 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1966 u32 portid, int event, struct netlink_ext_ack *extack)
1969 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1970 struct tc_action *act;
1971 size_t attr_size = 0;
1972 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1974 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1979 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1981 return tca_action_flush(net, tb[1], n, portid, extack);
1983 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1987 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1988 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1993 attr_size += tcf_action_fill_size(act);
1994 actions[i - 1] = act;
1997 attr_size = tcf_action_full_attrs_size(attr_size);
1999 if (event == RTM_GETACTION)
2000 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2002 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2008 tcf_action_put_many(actions);
2012 static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2013 struct tc_action *actions[],
2014 u32 portid, size_t attr_size,
2015 struct netlink_ext_ack *extack)
2017 struct sk_buff *skb;
2019 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2021 return ERR_PTR(-ENOBUFS);
2023 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
2024 RTM_NEWACTION, 0, 0, extack) <= 0) {
2025 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2027 return ERR_PTR(-EINVAL);
2033 static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2034 struct tc_action *actions[], u32 portid,
2035 size_t attr_size, struct netlink_ext_ack *extack)
2037 struct sk_buff *skb;
2039 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2042 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2045 return PTR_ERR(skb);
2048 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2049 n->nlmsg_flags & NLM_F_ECHO);
2052 static int tcf_action_add(struct net *net, struct nlattr *nla,
2053 struct nlmsghdr *n, u32 portid, u32 flags,
2054 struct netlink_ext_ack *extack)
2056 size_t attr_size = 0;
2058 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2059 int init_res[TCA_ACT_MAX_PRIO] = {};
2061 for (loop = 0; loop < 10; loop++) {
2062 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2063 &attr_size, flags, 0, extack);
2071 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2073 /* only put bound actions */
2074 tca_put_bound_many(actions, init_res);
2079 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2080 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2081 TCA_ACT_FLAG_TERSE_DUMP),
2082 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2085 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2086 struct netlink_ext_ack *extack)
2088 struct net *net = sock_net(skb->sk);
2089 struct nlattr *tca[TCA_ROOT_MAX + 1];
2090 u32 portid = NETLINK_CB(skb).portid;
2094 if ((n->nlmsg_type != RTM_GETACTION) &&
2095 !netlink_capable(skb, CAP_NET_ADMIN))
2098 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2099 TCA_ROOT_MAX, NULL, extack);
2103 if (tca[TCA_ACT_TAB] == NULL) {
2104 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2108 /* n->nlmsg_flags & NLM_F_CREATE */
2109 switch (n->nlmsg_type) {
2111 /* we are going to assume all other flags
2112 * imply create only if it doesn't exist
2113 * Note that CREATE | EXCL implies that
2114 * but since we want avoid ambiguity (eg when flags
2115 * is zero) then just set this
2117 if (n->nlmsg_flags & NLM_F_REPLACE)
2118 flags = TCA_ACT_FLAGS_REPLACE;
2119 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2123 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2124 portid, RTM_DELACTION, extack);
2127 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2128 portid, RTM_GETACTION, extack);
2137 static struct nlattr *find_dump_kind(struct nlattr **nla)
2139 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2140 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2141 struct nlattr *kind;
2143 tb1 = nla[TCA_ACT_TAB];
2147 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2152 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2154 kind = tb2[TCA_ACT_KIND];
2159 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2161 struct net *net = sock_net(skb->sk);
2162 struct nlmsghdr *nlh;
2163 unsigned char *b = skb_tail_pointer(skb);
2164 struct nlattr *nest;
2165 struct tc_action_ops *a_o;
2167 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2168 struct nlattr *tb[TCA_ROOT_MAX + 1];
2169 struct nlattr *count_attr = NULL;
2170 unsigned long jiffy_since = 0;
2171 struct nlattr *kind = NULL;
2172 struct nla_bitfield32 bf;
2173 u32 msecs_since = 0;
2176 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2177 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2181 kind = find_dump_kind(tb);
2183 pr_info("tc_dump_action: action bad kind\n");
2187 a_o = tc_lookup_action(kind);
2192 if (tb[TCA_ROOT_FLAGS]) {
2193 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2194 cb->args[2] = bf.value;
2197 if (tb[TCA_ROOT_TIME_DELTA]) {
2198 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2201 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2202 cb->nlh->nlmsg_type, sizeof(*t), 0);
2204 goto out_module_put;
2207 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2209 t = nlmsg_data(nlh);
2210 t->tca_family = AF_UNSPEC;
2213 cb->args[3] = jiffy_since;
2214 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2216 goto out_module_put;
2218 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2220 goto out_module_put;
2222 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2224 goto out_module_put;
2227 nla_nest_end(skb, nest);
2229 act_count = cb->args[1];
2230 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2235 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2236 if (NETLINK_CB(cb->skb).portid && ret)
2237 nlh->nlmsg_flags |= NLM_F_MULTI;
2238 module_put(a_o->owner);
2242 module_put(a_o->owner);
2247 static int __init tc_action_init(void)
2249 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2250 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2251 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2257 subsys_initcall(tc_action_init);