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->act_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 static bool tc_act_in_hw(struct tc_action *act)
174 return !!act->in_hw_count;
177 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
178 static bool tc_act_flags_valid(u32 flags)
180 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
182 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
185 static int offload_action_init(struct flow_offload_action *fl_action,
186 struct tc_action *act,
187 enum offload_act_command cmd,
188 struct netlink_ext_ack *extack)
192 fl_action->extack = extack;
193 fl_action->command = cmd;
194 fl_action->index = act->tcfa_index;
196 if (act->ops->offload_act_setup) {
197 spin_lock_bh(&act->tcfa_lock);
198 err = act->ops->offload_act_setup(act, fl_action, NULL,
200 spin_unlock_bh(&act->tcfa_lock);
207 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
212 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
223 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
225 flow_indr_block_bind_cb_t *cb,
230 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
240 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
242 flow_indr_block_bind_cb_t *cb,
245 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
247 tcf_action_offload_cmd_ex(fl_act, hw_count);
250 static int tcf_action_offload_add_ex(struct tc_action *action,
251 struct netlink_ext_ack *extack,
252 flow_indr_block_bind_cb_t *cb,
255 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
256 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
259 struct flow_offload_action *fl_action;
263 if (tc_act_skip_hw(action->tcfa_flags))
266 num = tcf_offload_act_num_actions_single(action);
267 fl_action = offload_action_alloc(num);
271 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
275 err = tc_setup_action(&fl_action->action, actions, extack);
277 NL_SET_ERR_MSG_MOD(extack,
278 "Failed to setup tc actions for offload");
282 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
284 cb ? offload_action_hw_count_inc(action, in_hw_count) :
285 offload_action_hw_count_set(action, in_hw_count);
287 if (skip_sw && !tc_act_in_hw(action))
290 tc_cleanup_offload_action(&fl_action->action);
298 /* offload the tc action after it is inserted */
299 static int tcf_action_offload_add(struct tc_action *action,
300 struct netlink_ext_ack *extack)
302 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
305 int tcf_action_update_hw_stats(struct tc_action *action)
307 struct flow_offload_action fl_act = {};
310 if (!tc_act_in_hw(action))
313 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
317 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
320 tcf_action_stats_update(action, fl_act.stats.bytes,
323 fl_act.stats.lastused,
326 action->used_hw_stats = fl_act.stats.used_hw_stats;
327 action->used_hw_stats_valid = true;
334 EXPORT_SYMBOL(tcf_action_update_hw_stats);
336 static int tcf_action_offload_del_ex(struct tc_action *action,
337 flow_indr_block_bind_cb_t *cb,
340 struct flow_offload_action fl_act = {};
344 if (!tc_act_in_hw(action))
347 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
351 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
355 if (!cb && action->in_hw_count != in_hw_count)
358 /* do not need to update hw state when deleting action */
359 if (cb && in_hw_count)
360 offload_action_hw_count_dec(action, in_hw_count);
365 static int tcf_action_offload_del(struct tc_action *action)
367 return tcf_action_offload_del_ex(action, NULL, NULL);
370 static void tcf_action_cleanup(struct tc_action *p)
372 tcf_action_offload_del(p);
376 gen_kill_estimator(&p->tcfa_rate_est);
380 static int __tcf_action_put(struct tc_action *p, bool bind)
382 struct tcf_idrinfo *idrinfo = p->idrinfo;
384 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
386 atomic_dec(&p->tcfa_bindcnt);
387 idr_remove(&idrinfo->action_idr, p->tcfa_index);
388 mutex_unlock(&idrinfo->lock);
390 tcf_action_cleanup(p);
395 atomic_dec(&p->tcfa_bindcnt);
400 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
404 /* Release with strict==1 and bind==0 is only called through act API
405 * interface (classifiers always bind). Only case when action with
406 * positive reference count and zero bind count can exist is when it was
407 * also created with act API (unbinding last classifier will destroy the
408 * action if it was created by classifier). So only case when bind count
409 * can be changed after initial check is when unbound action is
410 * destroyed by act API while classifier binds to action with same id
411 * concurrently. This result either creation of new action(same behavior
412 * as before), or reusing existing action if concurrent process
413 * increments reference count before action is deleted. Both scenarios
417 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
420 if (__tcf_action_put(p, bind))
427 int tcf_idr_release(struct tc_action *a, bool bind)
429 const struct tc_action_ops *ops = a->ops;
432 ret = __tcf_idr_release(a, bind, false);
433 if (ret == ACT_P_DELETED)
434 module_put(ops->owner);
437 EXPORT_SYMBOL(tcf_idr_release);
439 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
441 struct tc_cookie *act_cookie;
445 act_cookie = rcu_dereference(act->act_cookie);
448 cookie_len = nla_total_size(act_cookie->len);
451 return nla_total_size(0) /* action number nested */
452 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
453 + cookie_len /* TCA_ACT_COOKIE */
454 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
455 + nla_total_size(0) /* TCA_ACT_STATS nested */
456 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
457 /* TCA_STATS_BASIC */
458 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
459 /* TCA_STATS_PKT64 */
460 + nla_total_size_64bit(sizeof(u64))
461 /* TCA_STATS_QUEUE */
462 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
463 + nla_total_size(0) /* TCA_OPTIONS nested */
464 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
467 static size_t tcf_action_full_attrs_size(size_t sz)
469 return NLMSG_HDRLEN /* struct nlmsghdr */
470 + sizeof(struct tcamsg)
471 + nla_total_size(0) /* TCA_ACT_TAB nested */
475 static size_t tcf_action_fill_size(const struct tc_action *act)
477 size_t sz = tcf_action_shared_attrs_size(act);
479 if (act->ops->get_fill_size)
480 return act->ops->get_fill_size(act) + sz;
485 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
487 unsigned char *b = skb_tail_pointer(skb);
488 struct tc_cookie *cookie;
490 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
491 goto nla_put_failure;
492 if (tcf_action_copy_stats(skb, a, 0))
493 goto nla_put_failure;
494 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
495 goto nla_put_failure;
498 cookie = rcu_dereference(a->act_cookie);
500 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
502 goto nla_put_failure;
514 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
515 struct netlink_callback *cb)
517 int err = 0, index = -1, s_i = 0, n_i = 0;
518 u32 act_flags = cb->args[2];
519 unsigned long jiffy_since = cb->args[3];
521 struct idr *idr = &idrinfo->action_idr;
523 unsigned long id = 1;
526 mutex_lock(&idrinfo->lock);
530 idr_for_each_entry_ul(idr, p, tmp, id) {
538 time_after(jiffy_since,
539 (unsigned long)p->tcfa_tm.lastuse))
542 nest = nla_nest_start_noflag(skb, n_i);
545 goto nla_put_failure;
547 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
548 tcf_action_dump_terse(skb, p, true) :
549 tcf_action_dump_1(skb, p, 0, 0);
552 nlmsg_trim(skb, nest);
555 nla_nest_end(skb, nest);
557 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
558 n_i >= TCA_ACT_MAX_PRIO)
563 cb->args[0] = index + 1;
565 mutex_unlock(&idrinfo->lock);
567 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
573 nla_nest_cancel(skb, nest);
577 static int tcf_idr_release_unsafe(struct tc_action *p)
579 if (atomic_read(&p->tcfa_bindcnt) > 0)
582 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
583 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
584 tcf_action_cleanup(p);
585 return ACT_P_DELETED;
591 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
592 const struct tc_action_ops *ops,
593 struct netlink_ext_ack *extack)
598 struct idr *idr = &idrinfo->action_idr;
600 unsigned long id = 1;
603 nest = nla_nest_start_noflag(skb, 0);
605 goto nla_put_failure;
606 if (nla_put_string(skb, TCA_KIND, ops->kind))
607 goto nla_put_failure;
610 mutex_lock(&idrinfo->lock);
611 idr_for_each_entry_ul(idr, p, tmp, id) {
614 ret = tcf_idr_release_unsafe(p);
615 if (ret == ACT_P_DELETED)
616 module_put(ops->owner);
621 mutex_unlock(&idrinfo->lock);
624 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
626 goto nla_put_failure;
629 ret = nla_put_u32(skb, TCA_FCNT, n_i);
631 goto nla_put_failure;
632 nla_nest_end(skb, nest);
636 nla_nest_cancel(skb, nest);
640 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
641 struct netlink_callback *cb, int type,
642 const struct tc_action_ops *ops,
643 struct netlink_ext_ack *extack)
645 struct tcf_idrinfo *idrinfo = tn->idrinfo;
647 if (type == RTM_DELACTION) {
648 return tcf_del_walker(idrinfo, skb, ops, extack);
649 } else if (type == RTM_GETACTION) {
650 return tcf_dump_walker(idrinfo, skb, cb);
652 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
653 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
657 EXPORT_SYMBOL(tcf_generic_walker);
659 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
661 struct tcf_idrinfo *idrinfo = tn->idrinfo;
664 mutex_lock(&idrinfo->lock);
665 p = idr_find(&idrinfo->action_idr, index);
669 refcount_inc(&p->tcfa_refcnt);
670 mutex_unlock(&idrinfo->lock);
678 EXPORT_SYMBOL(tcf_idr_search);
680 static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
681 struct netlink_callback *cb, int type,
682 const struct tc_action_ops *ops,
683 struct netlink_ext_ack *extack)
685 struct tc_action_net *tn = net_generic(net, ops->net_id);
687 if (unlikely(ops->walk))
688 return ops->walk(net, skb, cb, type, ops, extack);
690 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
693 static int __tcf_idr_search(struct net *net,
694 const struct tc_action_ops *ops,
695 struct tc_action **a, u32 index)
697 struct tc_action_net *tn = net_generic(net, ops->net_id);
699 if (unlikely(ops->lookup))
700 return ops->lookup(net, a, index);
702 return tcf_idr_search(tn, a, index);
705 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
710 mutex_lock(&idrinfo->lock);
711 p = idr_find(&idrinfo->action_idr, index);
713 mutex_unlock(&idrinfo->lock);
717 if (!atomic_read(&p->tcfa_bindcnt)) {
718 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
719 struct module *owner = p->ops->owner;
721 WARN_ON(p != idr_remove(&idrinfo->action_idr,
723 mutex_unlock(&idrinfo->lock);
725 tcf_action_cleanup(p);
734 mutex_unlock(&idrinfo->lock);
738 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
739 struct tc_action **a, const struct tc_action_ops *ops,
740 int bind, bool cpustats, u32 flags)
742 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
743 struct tcf_idrinfo *idrinfo = tn->idrinfo;
748 refcount_set(&p->tcfa_refcnt, 1);
750 atomic_set(&p->tcfa_bindcnt, 1);
753 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
756 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
757 if (!p->cpu_bstats_hw)
759 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
763 gnet_stats_basic_sync_init(&p->tcfa_bstats);
764 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
765 spin_lock_init(&p->tcfa_lock);
766 p->tcfa_index = index;
767 p->tcfa_tm.install = jiffies;
768 p->tcfa_tm.lastuse = jiffies;
769 p->tcfa_tm.firstuse = 0;
770 p->tcfa_flags = flags;
772 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
774 &p->tcfa_lock, false, est);
779 p->idrinfo = idrinfo;
780 __module_get(ops->owner);
785 free_percpu(p->cpu_qstats);
787 free_percpu(p->cpu_bstats_hw);
789 free_percpu(p->cpu_bstats);
794 EXPORT_SYMBOL(tcf_idr_create);
796 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
797 struct nlattr *est, struct tc_action **a,
798 const struct tc_action_ops *ops, int bind,
801 /* Set cpustats according to actions flags. */
802 return tcf_idr_create(tn, index, est, a, ops, bind,
803 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
805 EXPORT_SYMBOL(tcf_idr_create_from_flags);
807 /* Cleanup idr index that was allocated but not initialized. */
809 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
811 struct tcf_idrinfo *idrinfo = tn->idrinfo;
813 mutex_lock(&idrinfo->lock);
814 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
815 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
816 mutex_unlock(&idrinfo->lock);
818 EXPORT_SYMBOL(tcf_idr_cleanup);
820 /* Check if action with specified index exists. If actions is found, increments
821 * its reference and bind counters, and return 1. Otherwise insert temporary
822 * error pointer (to prevent concurrent users from inserting actions with same
823 * index) and return 0.
826 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
827 struct tc_action **a, int bind)
829 struct tcf_idrinfo *idrinfo = tn->idrinfo;
834 mutex_lock(&idrinfo->lock);
836 p = idr_find(&idrinfo->action_idr, *index);
838 /* This means that another process allocated
839 * index but did not assign the pointer yet.
841 mutex_unlock(&idrinfo->lock);
846 refcount_inc(&p->tcfa_refcnt);
848 atomic_inc(&p->tcfa_bindcnt);
853 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
856 idr_replace(&idrinfo->action_idr,
857 ERR_PTR(-EBUSY), *index);
862 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
863 UINT_MAX, GFP_KERNEL);
865 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
868 mutex_unlock(&idrinfo->lock);
871 EXPORT_SYMBOL(tcf_idr_check_alloc);
873 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
874 struct tcf_idrinfo *idrinfo)
876 struct idr *idr = &idrinfo->action_idr;
879 unsigned long id = 1;
882 idr_for_each_entry_ul(idr, p, tmp, id) {
883 ret = __tcf_idr_release(p, false, true);
884 if (ret == ACT_P_DELETED)
885 module_put(ops->owner);
889 idr_destroy(&idrinfo->action_idr);
891 EXPORT_SYMBOL(tcf_idrinfo_destroy);
893 static LIST_HEAD(act_base);
894 static DEFINE_RWLOCK(act_mod_lock);
895 /* since act ops id is stored in pernet subsystem list,
896 * then there is no way to walk through only all the action
897 * subsystem, so we keep tc action pernet ops id for
898 * reoffload to walk through.
900 static LIST_HEAD(act_pernet_id_list);
901 static DEFINE_MUTEX(act_id_mutex);
902 struct tc_act_pernet_id {
903 struct list_head list;
907 static int tcf_pernet_add_id_list(unsigned int id)
909 struct tc_act_pernet_id *id_ptr;
912 mutex_lock(&act_id_mutex);
913 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
914 if (id_ptr->id == id) {
920 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
927 list_add_tail(&id_ptr->list, &act_pernet_id_list);
930 mutex_unlock(&act_id_mutex);
934 static void tcf_pernet_del_id_list(unsigned int id)
936 struct tc_act_pernet_id *id_ptr;
938 mutex_lock(&act_id_mutex);
939 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
940 if (id_ptr->id == id) {
941 list_del(&id_ptr->list);
946 mutex_unlock(&act_id_mutex);
949 int tcf_register_action(struct tc_action_ops *act,
950 struct pernet_operations *ops)
952 struct tc_action_ops *a;
955 if (!act->act || !act->dump || !act->init)
958 /* We have to register pernet ops before making the action ops visible,
959 * otherwise tcf_action_init_1() could get a partially initialized
962 ret = register_pernet_subsys(ops);
967 ret = tcf_pernet_add_id_list(*ops->id);
972 write_lock(&act_mod_lock);
973 list_for_each_entry(a, &act_base, head) {
974 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
979 list_add_tail(&act->head, &act_base);
980 write_unlock(&act_mod_lock);
985 write_unlock(&act_mod_lock);
987 tcf_pernet_del_id_list(*ops->id);
989 unregister_pernet_subsys(ops);
992 EXPORT_SYMBOL(tcf_register_action);
994 int tcf_unregister_action(struct tc_action_ops *act,
995 struct pernet_operations *ops)
997 struct tc_action_ops *a;
1000 write_lock(&act_mod_lock);
1001 list_for_each_entry(a, &act_base, head) {
1003 list_del(&act->head);
1008 write_unlock(&act_mod_lock);
1010 unregister_pernet_subsys(ops);
1012 tcf_pernet_del_id_list(*ops->id);
1016 EXPORT_SYMBOL(tcf_unregister_action);
1018 /* lookup by name */
1019 static struct tc_action_ops *tc_lookup_action_n(char *kind)
1021 struct tc_action_ops *a, *res = NULL;
1024 read_lock(&act_mod_lock);
1025 list_for_each_entry(a, &act_base, head) {
1026 if (strcmp(kind, a->kind) == 0) {
1027 if (try_module_get(a->owner))
1032 read_unlock(&act_mod_lock);
1037 /* lookup by nlattr */
1038 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1040 struct tc_action_ops *a, *res = NULL;
1043 read_lock(&act_mod_lock);
1044 list_for_each_entry(a, &act_base, head) {
1045 if (nla_strcmp(kind, a->kind) == 0) {
1046 if (try_module_get(a->owner))
1051 read_unlock(&act_mod_lock);
1056 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1057 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
1058 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1059 int nr_actions, struct tcf_result *res)
1062 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1064 int ret = TC_ACT_OK;
1066 if (skb_skip_tc_classify(skb))
1070 for (i = 0; i < nr_actions; i++) {
1071 const struct tc_action *a = actions[i];
1074 if (jmp_prgcnt > 0) {
1079 if (tc_act_skip_sw(a->tcfa_flags))
1084 ret = tc_act(skb, a, res);
1085 if (unlikely(ret == TC_ACT_REPEAT)) {
1086 if (--repeat_ttl != 0)
1088 /* suspicious opcode, stop pipeline */
1089 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1092 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1093 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1094 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1095 /* faulty opcode, stop pipeline */
1100 goto restart_act_graph;
1101 else /* faulty graph, stop pipeline */
1104 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1105 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1106 net_warn_ratelimited("can't go to NULL chain!\n");
1109 tcf_action_goto_chain_exec(a, res);
1112 if (ret != TC_ACT_PIPE)
1118 EXPORT_SYMBOL(tcf_action_exec);
1120 int tcf_action_destroy(struct tc_action *actions[], int bind)
1122 const struct tc_action_ops *ops;
1123 struct tc_action *a;
1126 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1130 ret = __tcf_idr_release(a, bind, true);
1131 if (ret == ACT_P_DELETED)
1132 module_put(ops->owner);
1139 static int tcf_action_put(struct tc_action *p)
1141 return __tcf_action_put(p, false);
1144 /* Put all actions in this array, skip those NULL's. */
1145 static void tcf_action_put_many(struct tc_action *actions[])
1149 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1150 struct tc_action *a = actions[i];
1151 const struct tc_action_ops *ops;
1156 if (tcf_action_put(a))
1157 module_put(ops->owner);
1162 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1164 return a->ops->dump(skb, a, bind, ref);
1168 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1171 unsigned char *b = skb_tail_pointer(skb);
1172 struct nlattr *nest;
1175 if (tcf_action_dump_terse(skb, a, false))
1176 goto nla_put_failure;
1178 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1179 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1180 a->hw_stats, TCA_ACT_HW_STATS_ANY))
1181 goto nla_put_failure;
1183 if (a->used_hw_stats_valid &&
1184 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1185 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1186 goto nla_put_failure;
1188 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1190 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1192 goto nla_put_failure;
1194 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1195 goto nla_put_failure;
1197 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1199 goto nla_put_failure;
1200 err = tcf_action_dump_old(skb, a, bind, ref);
1202 nla_nest_end(skb, nest);
1210 EXPORT_SYMBOL(tcf_action_dump_1);
1212 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1213 int bind, int ref, bool terse)
1215 struct tc_action *a;
1216 int err = -EINVAL, i;
1217 struct nlattr *nest;
1219 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1221 nest = nla_nest_start_noflag(skb, i + 1);
1223 goto nla_put_failure;
1224 err = terse ? tcf_action_dump_terse(skb, a, false) :
1225 tcf_action_dump_1(skb, a, bind, ref);
1228 nla_nest_end(skb, nest);
1236 nla_nest_cancel(skb, nest);
1240 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1242 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1246 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1251 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1256 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1258 struct nla_bitfield32 hw_stats_bf;
1260 /* If the user did not pass the attr, that means he does
1261 * not care about the type. Return "any" in that case
1262 * which is setting on all supported types.
1265 return TCA_ACT_HW_STATS_ANY;
1266 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1267 return hw_stats_bf.value;
1270 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1271 [TCA_ACT_KIND] = { .type = NLA_STRING },
1272 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1273 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1274 .len = TC_COOKIE_MAX_SIZE },
1275 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1276 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1277 TCA_ACT_FLAGS_SKIP_HW |
1278 TCA_ACT_FLAGS_SKIP_SW),
1279 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1282 void tcf_idr_insert_many(struct tc_action *actions[])
1286 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1287 struct tc_action *a = actions[i];
1288 struct tcf_idrinfo *idrinfo;
1292 idrinfo = a->idrinfo;
1293 mutex_lock(&idrinfo->lock);
1294 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
1295 * it is just created, otherwise this is just a nop.
1297 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1298 mutex_unlock(&idrinfo->lock);
1302 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
1304 struct netlink_ext_ack *extack)
1306 struct nlattr *tb[TCA_ACT_MAX + 1];
1307 struct tc_action_ops *a_o;
1308 char act_name[IFNAMSIZ];
1309 struct nlattr *kind;
1313 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1314 tcf_action_policy, extack);
1316 return ERR_PTR(err);
1318 kind = tb[TCA_ACT_KIND];
1320 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1321 return ERR_PTR(err);
1323 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1324 NL_SET_ERR_MSG(extack, "TC action name too long");
1325 return ERR_PTR(err);
1328 if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) {
1329 NL_SET_ERR_MSG(extack, "TC action name too long");
1330 return ERR_PTR(-EINVAL);
1334 a_o = tc_lookup_action_n(act_name);
1336 #ifdef CONFIG_MODULES
1339 request_module("act_%s", act_name);
1343 a_o = tc_lookup_action_n(act_name);
1345 /* We dropped the RTNL semaphore in order to
1346 * perform the module load. So, even if we
1347 * succeeded in loading the module we have to
1348 * tell the caller to replay the request. We
1349 * indicate this using -EAGAIN.
1352 module_put(a_o->owner);
1353 return ERR_PTR(-EAGAIN);
1356 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1357 return ERR_PTR(-ENOENT);
1363 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1364 struct nlattr *nla, struct nlattr *est,
1365 struct tc_action_ops *a_o, int *init_res,
1366 u32 flags, struct netlink_ext_ack *extack)
1368 bool police = flags & TCA_ACT_FLAGS_POLICE;
1369 struct nla_bitfield32 userflags = { 0, 0 };
1370 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1371 struct nlattr *tb[TCA_ACT_MAX + 1];
1372 struct tc_cookie *cookie = NULL;
1373 struct tc_action *a;
1376 /* backward compatibility for policer */
1378 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1379 tcf_action_policy, extack);
1381 return ERR_PTR(err);
1382 if (tb[TCA_ACT_COOKIE]) {
1383 cookie = nla_memdup_cookie(tb);
1385 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1390 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1391 if (tb[TCA_ACT_FLAGS]) {
1392 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1393 if (!tc_act_flags_valid(userflags.value)) {
1399 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1400 userflags.value | flags, extack);
1402 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1409 if (!police && tb[TCA_ACT_COOKIE])
1410 tcf_set_action_cookie(&a->act_cookie, cookie);
1413 a->hw_stats = hw_stats;
1419 kfree(cookie->data);
1422 return ERR_PTR(err);
1425 static bool tc_act_bind(u32 flags)
1427 return !!(flags & TCA_ACT_FLAGS_BIND);
1430 /* Returns numbers of initialized actions or negative error. */
1432 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1433 struct nlattr *est, struct tc_action *actions[],
1434 int init_res[], size_t *attr_size,
1435 u32 flags, u32 fl_flags,
1436 struct netlink_ext_ack *extack)
1438 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1439 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1440 struct tc_action *act;
1445 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1450 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1451 struct tc_action_ops *a_o;
1453 a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE,
1454 !(flags & TCA_ACT_FLAGS_NO_RTNL),
1463 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1464 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1465 &init_res[i - 1], flags, extack);
1470 sz += tcf_action_fill_size(act);
1471 /* Start from index 0 */
1472 actions[i - 1] = act;
1473 if (tc_act_bind(flags)) {
1474 bool skip_sw = tc_skip_sw(fl_flags);
1475 bool skip_hw = tc_skip_hw(fl_flags);
1477 if (tc_act_bind(act->tcfa_flags))
1479 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1480 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1481 NL_SET_ERR_MSG(extack,
1482 "Mismatch between action and filter offload flags");
1487 err = tcf_action_offload_add(act, extack);
1488 if (tc_act_skip_sw(act->tcfa_flags) && err)
1493 /* We have to commit them all together, because if any error happened in
1494 * between, we could not handle the failure gracefully.
1496 tcf_idr_insert_many(actions);
1498 *attr_size = tcf_action_full_attrs_size(sz);
1503 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1505 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1507 module_put(ops[i]->owner);
1512 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1515 if (a->cpu_bstats) {
1516 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1518 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1521 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1526 _bstats_update(&a->tcfa_bstats, bytes, packets);
1527 a->tcfa_qstats.drops += drops;
1529 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1531 EXPORT_SYMBOL(tcf_action_update_stats);
1533 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1542 /* update hw stats for this action */
1543 tcf_action_update_hw_stats(p);
1545 /* compat_mode being true specifies a call that is supposed
1546 * to add additional backward compatibility statistic TLVs.
1549 if (p->type == TCA_OLD_COMPAT)
1550 err = gnet_stats_start_copy_compat(skb, 0,
1558 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1559 &p->tcfa_lock, &d, TCA_ACT_PAD);
1564 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1565 &p->tcfa_bstats, false) < 0 ||
1566 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1567 &p->tcfa_bstats_hw, false) < 0 ||
1568 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1569 gnet_stats_copy_queue(&d, p->cpu_qstats,
1571 p->tcfa_qstats.qlen) < 0)
1574 if (gnet_stats_finish_copy(&d) < 0)
1583 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1584 u32 portid, u32 seq, u16 flags, int event, int bind,
1588 struct nlmsghdr *nlh;
1589 unsigned char *b = skb_tail_pointer(skb);
1590 struct nlattr *nest;
1592 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1594 goto out_nlmsg_trim;
1595 t = nlmsg_data(nlh);
1596 t->tca_family = AF_UNSPEC;
1600 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1602 goto out_nlmsg_trim;
1604 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1605 goto out_nlmsg_trim;
1607 nla_nest_end(skb, nest);
1609 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1618 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1619 struct tc_action *actions[], int event,
1620 struct netlink_ext_ack *extack)
1622 struct sk_buff *skb;
1624 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1627 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1629 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1634 return rtnl_unicast(skb, net, portid);
1637 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1638 struct nlmsghdr *n, u32 portid,
1639 struct netlink_ext_ack *extack)
1641 struct nlattr *tb[TCA_ACT_MAX + 1];
1642 const struct tc_action_ops *ops;
1643 struct tc_action *a;
1647 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1648 tcf_action_policy, extack);
1653 if (tb[TCA_ACT_INDEX] == NULL ||
1654 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1655 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1658 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1661 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1662 if (!ops) { /* could happen in batch of actions */
1663 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1667 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1668 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1672 module_put(ops->owner);
1676 module_put(ops->owner);
1678 return ERR_PTR(err);
1681 static int tca_action_flush(struct net *net, struct nlattr *nla,
1682 struct nlmsghdr *n, u32 portid,
1683 struct netlink_ext_ack *extack)
1685 struct sk_buff *skb;
1687 struct nlmsghdr *nlh;
1689 struct netlink_callback dcb;
1690 struct nlattr *nest;
1691 struct nlattr *tb[TCA_ACT_MAX + 1];
1692 const struct tc_action_ops *ops;
1693 struct nlattr *kind;
1696 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1700 b = skb_tail_pointer(skb);
1702 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1703 tcf_action_policy, extack);
1708 kind = tb[TCA_ACT_KIND];
1709 ops = tc_lookup_action(kind);
1710 if (!ops) { /*some idjot trying to flush unknown action */
1711 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1715 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1718 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1719 goto out_module_put;
1721 t = nlmsg_data(nlh);
1722 t->tca_family = AF_UNSPEC;
1726 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1728 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1729 goto out_module_put;
1732 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1734 nla_nest_cancel(skb, nest);
1735 goto out_module_put;
1738 nla_nest_end(skb, nest);
1740 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1741 nlh->nlmsg_flags |= NLM_F_ROOT;
1742 module_put(ops->owner);
1743 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1744 n->nlmsg_flags & NLM_F_ECHO);
1746 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1751 module_put(ops->owner);
1757 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1761 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1762 struct tc_action *a = actions[i];
1763 const struct tc_action_ops *ops = a->ops;
1764 /* Actions can be deleted concurrently so we must save their
1765 * type and id to search again after reference is released.
1767 struct tcf_idrinfo *idrinfo = a->idrinfo;
1768 u32 act_index = a->tcfa_index;
1771 if (tcf_action_put(a)) {
1772 /* last reference, action was deleted concurrently */
1773 module_put(ops->owner);
1777 /* now do the delete */
1778 ret = tcf_idr_delete_index(idrinfo, act_index);
1787 tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1789 size_t attr_size = tcf_action_fill_size(action);
1790 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1793 const struct tc_action_ops *ops = action->ops;
1794 struct sk_buff *skb;
1797 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1802 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) {
1807 ret = tcf_idr_release_unsafe(action);
1808 if (ret == ACT_P_DELETED) {
1809 module_put(ops->owner);
1810 ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0);
1818 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1819 void *cb_priv, bool add)
1821 struct tc_act_pernet_id *id_ptr;
1822 struct tcf_idrinfo *idrinfo;
1823 struct tc_action_net *tn;
1824 struct tc_action *p;
1825 unsigned int act_id;
1835 down_read(&net_rwsem);
1836 mutex_lock(&act_id_mutex);
1839 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1840 act_id = id_ptr->id;
1841 tn = net_generic(net, act_id);
1844 idrinfo = tn->idrinfo;
1848 mutex_lock(&idrinfo->lock);
1849 idr = &idrinfo->action_idr;
1850 idr_for_each_entry_ul(idr, p, tmp, id) {
1851 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1854 tcf_action_offload_add_ex(p, NULL, cb,
1859 /* cb unregister to update hw count */
1860 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1863 if (tc_act_skip_sw(p->tcfa_flags) &&
1865 tcf_reoffload_del_notify(net, p);
1867 mutex_unlock(&idrinfo->lock);
1870 mutex_unlock(&act_id_mutex);
1871 up_read(&net_rwsem);
1877 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1878 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1881 struct sk_buff *skb;
1883 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1888 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1890 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1895 /* now do the delete */
1896 ret = tcf_action_delete(net, actions);
1898 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1903 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1904 n->nlmsg_flags & NLM_F_ECHO);
1909 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1910 u32 portid, int event, struct netlink_ext_ack *extack)
1913 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1914 struct tc_action *act;
1915 size_t attr_size = 0;
1916 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1918 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1923 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1925 return tca_action_flush(net, tb[1], n, portid, extack);
1927 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1931 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1932 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1937 attr_size += tcf_action_fill_size(act);
1938 actions[i - 1] = act;
1941 attr_size = tcf_action_full_attrs_size(attr_size);
1943 if (event == RTM_GETACTION)
1944 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1946 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1952 tcf_action_put_many(actions);
1957 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1958 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1960 struct sk_buff *skb;
1962 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1967 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1968 RTM_NEWACTION, 0, 0) <= 0) {
1969 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1974 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1975 n->nlmsg_flags & NLM_F_ECHO);
1978 static int tcf_action_add(struct net *net, struct nlattr *nla,
1979 struct nlmsghdr *n, u32 portid, u32 flags,
1980 struct netlink_ext_ack *extack)
1982 size_t attr_size = 0;
1984 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1985 int init_res[TCA_ACT_MAX_PRIO] = {};
1987 for (loop = 0; loop < 10; loop++) {
1988 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
1989 &attr_size, flags, 0, extack);
1996 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1998 /* only put existing actions */
1999 for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
2000 if (init_res[i] == ACT_P_CREATED)
2002 tcf_action_put_many(actions);
2007 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2008 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2009 TCA_ACT_FLAG_TERSE_DUMP),
2010 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2013 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2014 struct netlink_ext_ack *extack)
2016 struct net *net = sock_net(skb->sk);
2017 struct nlattr *tca[TCA_ROOT_MAX + 1];
2018 u32 portid = NETLINK_CB(skb).portid;
2022 if ((n->nlmsg_type != RTM_GETACTION) &&
2023 !netlink_capable(skb, CAP_NET_ADMIN))
2026 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2027 TCA_ROOT_MAX, NULL, extack);
2031 if (tca[TCA_ACT_TAB] == NULL) {
2032 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2036 /* n->nlmsg_flags & NLM_F_CREATE */
2037 switch (n->nlmsg_type) {
2039 /* we are going to assume all other flags
2040 * imply create only if it doesn't exist
2041 * Note that CREATE | EXCL implies that
2042 * but since we want avoid ambiguity (eg when flags
2043 * is zero) then just set this
2045 if (n->nlmsg_flags & NLM_F_REPLACE)
2046 flags = TCA_ACT_FLAGS_REPLACE;
2047 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2051 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2052 portid, RTM_DELACTION, extack);
2055 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2056 portid, RTM_GETACTION, extack);
2065 static struct nlattr *find_dump_kind(struct nlattr **nla)
2067 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2068 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2069 struct nlattr *kind;
2071 tb1 = nla[TCA_ACT_TAB];
2075 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2080 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2082 kind = tb2[TCA_ACT_KIND];
2087 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2089 struct net *net = sock_net(skb->sk);
2090 struct nlmsghdr *nlh;
2091 unsigned char *b = skb_tail_pointer(skb);
2092 struct nlattr *nest;
2093 struct tc_action_ops *a_o;
2095 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2096 struct nlattr *tb[TCA_ROOT_MAX + 1];
2097 struct nlattr *count_attr = NULL;
2098 unsigned long jiffy_since = 0;
2099 struct nlattr *kind = NULL;
2100 struct nla_bitfield32 bf;
2101 u32 msecs_since = 0;
2104 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2105 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2109 kind = find_dump_kind(tb);
2111 pr_info("tc_dump_action: action bad kind\n");
2115 a_o = tc_lookup_action(kind);
2120 if (tb[TCA_ROOT_FLAGS]) {
2121 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2122 cb->args[2] = bf.value;
2125 if (tb[TCA_ROOT_TIME_DELTA]) {
2126 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2129 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2130 cb->nlh->nlmsg_type, sizeof(*t), 0);
2132 goto out_module_put;
2135 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2137 t = nlmsg_data(nlh);
2138 t->tca_family = AF_UNSPEC;
2141 cb->args[3] = jiffy_since;
2142 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2144 goto out_module_put;
2146 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2148 goto out_module_put;
2150 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2152 goto out_module_put;
2155 nla_nest_end(skb, nest);
2157 act_count = cb->args[1];
2158 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2163 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2164 if (NETLINK_CB(cb->skb).portid && ret)
2165 nlh->nlmsg_flags |= NLM_F_MULTI;
2166 module_put(a_o->owner);
2170 module_put(a_o->owner);
2175 static int __init tc_action_init(void)
2177 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2178 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2179 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2185 subsys_initcall(tc_action_init);