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 <linux/rhashtable.h>
25 #include <linux/list.h>
26 #include <net/net_namespace.h>
28 #include <net/sch_generic.h>
29 #include <net/pkt_cls.h>
30 #include <net/act_api.h>
31 #include <net/netlink.h>
33 static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
35 u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
39 a->goto_chain = tcf_chain_get_by_act(tp->chain->block, chain_index);
45 static void tcf_action_goto_chain_fini(struct tc_action *a)
47 tcf_chain_put_by_act(a->goto_chain);
50 static void tcf_action_goto_chain_exec(const struct tc_action *a,
51 struct tcf_result *res)
53 const struct tcf_chain *chain = a->goto_chain;
55 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
58 static void tcf_free_cookie_rcu(struct rcu_head *p)
60 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
66 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
67 struct tc_cookie *new_cookie)
69 struct tc_cookie *old;
71 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
73 call_rcu(&old->rcu, tcf_free_cookie_rcu);
76 /* XXX: For standalone actions, we don't need a RCU grace period either, because
77 * actions are always connected to filters and filters are already destroyed in
78 * RCU callbacks, so after a RCU grace period actions are already disconnected
79 * from filters. Readers later can not find us.
81 static void free_tcf(struct tc_action *p)
83 free_percpu(p->cpu_bstats);
84 free_percpu(p->cpu_qstats);
86 tcf_set_action_cookie(&p->act_cookie, NULL);
88 tcf_action_goto_chain_fini(p);
93 static void tcf_action_cleanup(struct tc_action *p)
98 gen_kill_estimator(&p->tcfa_rate_est);
102 static int __tcf_action_put(struct tc_action *p, bool bind)
104 struct tcf_idrinfo *idrinfo = p->idrinfo;
106 if (refcount_dec_and_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
108 atomic_dec(&p->tcfa_bindcnt);
109 idr_remove(&idrinfo->action_idr, p->tcfa_index);
110 spin_unlock(&idrinfo->lock);
112 tcf_action_cleanup(p);
117 atomic_dec(&p->tcfa_bindcnt);
122 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
126 /* Release with strict==1 and bind==0 is only called through act API
127 * interface (classifiers always bind). Only case when action with
128 * positive reference count and zero bind count can exist is when it was
129 * also created with act API (unbinding last classifier will destroy the
130 * action if it was created by classifier). So only case when bind count
131 * can be changed after initial check is when unbound action is
132 * destroyed by act API while classifier binds to action with same id
133 * concurrently. This result either creation of new action(same behavior
134 * as before), or reusing existing action if concurrent process
135 * increments reference count before action is deleted. Both scenarios
139 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
142 if (__tcf_action_put(p, bind))
148 EXPORT_SYMBOL(__tcf_idr_release);
150 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
152 struct tc_cookie *act_cookie;
156 act_cookie = rcu_dereference(act->act_cookie);
159 cookie_len = nla_total_size(act_cookie->len);
162 return nla_total_size(0) /* action number nested */
163 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
164 + cookie_len /* TCA_ACT_COOKIE */
165 + nla_total_size(0) /* TCA_ACT_STATS nested */
166 /* TCA_STATS_BASIC */
167 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
168 /* TCA_STATS_QUEUE */
169 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
170 + nla_total_size(0) /* TCA_OPTIONS nested */
171 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
174 static size_t tcf_action_full_attrs_size(size_t sz)
176 return NLMSG_HDRLEN /* struct nlmsghdr */
177 + sizeof(struct tcamsg)
178 + nla_total_size(0) /* TCA_ACT_TAB nested */
182 static size_t tcf_action_fill_size(const struct tc_action *act)
184 size_t sz = tcf_action_shared_attrs_size(act);
186 if (act->ops->get_fill_size)
187 return act->ops->get_fill_size(act) + sz;
191 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
192 struct netlink_callback *cb)
194 int err = 0, index = -1, s_i = 0, n_i = 0;
195 u32 act_flags = cb->args[2];
196 unsigned long jiffy_since = cb->args[3];
198 struct idr *idr = &idrinfo->action_idr;
200 unsigned long id = 1;
202 spin_lock(&idrinfo->lock);
206 idr_for_each_entry_ul(idr, p, id) {
212 time_after(jiffy_since,
213 (unsigned long)p->tcfa_tm.lastuse))
216 nest = nla_nest_start(skb, n_i);
219 goto nla_put_failure;
221 err = tcf_action_dump_1(skb, p, 0, 0);
224 nlmsg_trim(skb, nest);
227 nla_nest_end(skb, nest);
229 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
230 n_i >= TCA_ACT_MAX_PRIO)
235 cb->args[0] = index + 1;
237 spin_unlock(&idrinfo->lock);
239 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
245 nla_nest_cancel(skb, nest);
249 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
250 const struct tc_action_ops *ops)
255 struct idr *idr = &idrinfo->action_idr;
257 unsigned long id = 1;
259 nest = nla_nest_start(skb, 0);
261 goto nla_put_failure;
262 if (nla_put_string(skb, TCA_KIND, ops->kind))
263 goto nla_put_failure;
265 idr_for_each_entry_ul(idr, p, id) {
266 ret = __tcf_idr_release(p, false, true);
267 if (ret == ACT_P_DELETED) {
268 module_put(ops->owner);
270 } else if (ret < 0) {
271 goto nla_put_failure;
274 if (nla_put_u32(skb, TCA_FCNT, n_i))
275 goto nla_put_failure;
276 nla_nest_end(skb, nest);
280 nla_nest_cancel(skb, nest);
284 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
285 struct netlink_callback *cb, int type,
286 const struct tc_action_ops *ops,
287 struct netlink_ext_ack *extack)
289 struct tcf_idrinfo *idrinfo = tn->idrinfo;
291 if (type == RTM_DELACTION) {
292 return tcf_del_walker(idrinfo, skb, ops);
293 } else if (type == RTM_GETACTION) {
294 return tcf_dump_walker(idrinfo, skb, cb);
296 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
297 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
301 EXPORT_SYMBOL(tcf_generic_walker);
303 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
305 struct tcf_idrinfo *idrinfo = tn->idrinfo;
308 spin_lock(&idrinfo->lock);
309 p = idr_find(&idrinfo->action_idr, index);
313 refcount_inc(&p->tcfa_refcnt);
314 spin_unlock(&idrinfo->lock);
322 EXPORT_SYMBOL(tcf_idr_search);
324 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
329 spin_lock(&idrinfo->lock);
330 p = idr_find(&idrinfo->action_idr, index);
332 spin_unlock(&idrinfo->lock);
336 if (!atomic_read(&p->tcfa_bindcnt)) {
337 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
338 struct module *owner = p->ops->owner;
340 WARN_ON(p != idr_remove(&idrinfo->action_idr,
342 spin_unlock(&idrinfo->lock);
344 tcf_action_cleanup(p);
353 spin_unlock(&idrinfo->lock);
357 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
358 struct tc_action **a, const struct tc_action_ops *ops,
359 int bind, bool cpustats)
361 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
362 struct tcf_idrinfo *idrinfo = tn->idrinfo;
367 refcount_set(&p->tcfa_refcnt, 1);
369 atomic_set(&p->tcfa_bindcnt, 1);
372 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
375 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
379 spin_lock_init(&p->tcfa_lock);
380 p->tcfa_index = index;
381 p->tcfa_tm.install = jiffies;
382 p->tcfa_tm.lastuse = jiffies;
383 p->tcfa_tm.firstuse = 0;
385 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
387 &p->tcfa_lock, NULL, est);
392 p->idrinfo = idrinfo;
397 free_percpu(p->cpu_qstats);
399 free_percpu(p->cpu_bstats);
404 EXPORT_SYMBOL(tcf_idr_create);
406 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
408 struct tcf_idrinfo *idrinfo = tn->idrinfo;
410 spin_lock(&idrinfo->lock);
411 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
412 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
413 spin_unlock(&idrinfo->lock);
415 EXPORT_SYMBOL(tcf_idr_insert);
417 /* Cleanup idr index that was allocated but not initialized. */
419 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
421 struct tcf_idrinfo *idrinfo = tn->idrinfo;
423 spin_lock(&idrinfo->lock);
424 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
425 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
426 spin_unlock(&idrinfo->lock);
428 EXPORT_SYMBOL(tcf_idr_cleanup);
430 /* Check if action with specified index exists. If actions is found, increments
431 * its reference and bind counters, and return 1. Otherwise insert temporary
432 * error pointer (to prevent concurrent users from inserting actions with same
433 * index) and return 0.
436 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
437 struct tc_action **a, int bind)
439 struct tcf_idrinfo *idrinfo = tn->idrinfo;
444 spin_lock(&idrinfo->lock);
446 p = idr_find(&idrinfo->action_idr, *index);
448 /* This means that another process allocated
449 * index but did not assign the pointer yet.
451 spin_unlock(&idrinfo->lock);
456 refcount_inc(&p->tcfa_refcnt);
458 atomic_inc(&p->tcfa_bindcnt);
463 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
466 idr_replace(&idrinfo->action_idr,
467 ERR_PTR(-EBUSY), *index);
472 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
473 UINT_MAX, GFP_ATOMIC);
475 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
478 spin_unlock(&idrinfo->lock);
481 EXPORT_SYMBOL(tcf_idr_check_alloc);
483 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
484 struct tcf_idrinfo *idrinfo)
486 struct idr *idr = &idrinfo->action_idr;
489 unsigned long id = 1;
491 idr_for_each_entry_ul(idr, p, id) {
492 ret = __tcf_idr_release(p, false, true);
493 if (ret == ACT_P_DELETED)
494 module_put(ops->owner);
498 idr_destroy(&idrinfo->action_idr);
500 EXPORT_SYMBOL(tcf_idrinfo_destroy);
502 static LIST_HEAD(act_base);
503 static DEFINE_RWLOCK(act_mod_lock);
505 int tcf_register_action(struct tc_action_ops *act,
506 struct pernet_operations *ops)
508 struct tc_action_ops *a;
511 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
514 /* We have to register pernet ops before making the action ops visible,
515 * otherwise tcf_action_init_1() could get a partially initialized
518 ret = register_pernet_subsys(ops);
522 write_lock(&act_mod_lock);
523 list_for_each_entry(a, &act_base, head) {
524 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
525 write_unlock(&act_mod_lock);
526 unregister_pernet_subsys(ops);
530 list_add_tail(&act->head, &act_base);
531 write_unlock(&act_mod_lock);
535 EXPORT_SYMBOL(tcf_register_action);
537 int tcf_unregister_action(struct tc_action_ops *act,
538 struct pernet_operations *ops)
540 struct tc_action_ops *a;
543 write_lock(&act_mod_lock);
544 list_for_each_entry(a, &act_base, head) {
546 list_del(&act->head);
551 write_unlock(&act_mod_lock);
553 unregister_pernet_subsys(ops);
556 EXPORT_SYMBOL(tcf_unregister_action);
559 static struct tc_action_ops *tc_lookup_action_n(char *kind)
561 struct tc_action_ops *a, *res = NULL;
564 read_lock(&act_mod_lock);
565 list_for_each_entry(a, &act_base, head) {
566 if (strcmp(kind, a->kind) == 0) {
567 if (try_module_get(a->owner))
572 read_unlock(&act_mod_lock);
577 /* lookup by nlattr */
578 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
580 struct tc_action_ops *a, *res = NULL;
583 read_lock(&act_mod_lock);
584 list_for_each_entry(a, &act_base, head) {
585 if (nla_strcmp(kind, a->kind) == 0) {
586 if (try_module_get(a->owner))
591 read_unlock(&act_mod_lock);
596 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
597 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
598 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
599 int nr_actions, struct tcf_result *res)
602 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
606 if (skb_skip_tc_classify(skb))
610 for (i = 0; i < nr_actions; i++) {
611 const struct tc_action *a = actions[i];
613 if (jmp_prgcnt > 0) {
618 ret = a->ops->act(skb, a, res);
619 if (ret == TC_ACT_REPEAT)
620 goto repeat; /* we need a ttl - JHS */
622 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
623 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
624 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
625 /* faulty opcode, stop pipeline */
630 goto restart_act_graph;
631 else /* faulty graph, stop pipeline */
634 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
635 tcf_action_goto_chain_exec(a, res);
638 if (ret != TC_ACT_PIPE)
644 EXPORT_SYMBOL(tcf_action_exec);
646 int tcf_action_destroy(struct tc_action *actions[], int bind)
648 const struct tc_action_ops *ops;
652 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
656 ret = __tcf_idr_release(a, bind, true);
657 if (ret == ACT_P_DELETED)
658 module_put(ops->owner);
665 static int tcf_action_destroy_1(struct tc_action *a, int bind)
667 struct tc_action *actions[] = { a, NULL };
669 return tcf_action_destroy(actions, bind);
672 static int tcf_action_put(struct tc_action *p)
674 return __tcf_action_put(p, false);
677 /* Put all actions in this array, skip those NULL's. */
678 static void tcf_action_put_many(struct tc_action *actions[])
682 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
683 struct tc_action *a = actions[i];
684 const struct tc_action_ops *ops;
689 if (tcf_action_put(a))
690 module_put(ops->owner);
695 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
697 return a->ops->dump(skb, a, bind, ref);
701 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
704 unsigned char *b = skb_tail_pointer(skb);
706 struct tc_cookie *cookie;
708 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
709 goto nla_put_failure;
710 if (tcf_action_copy_stats(skb, a, 0))
711 goto nla_put_failure;
714 cookie = rcu_dereference(a->act_cookie);
716 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
718 goto nla_put_failure;
723 nest = nla_nest_start(skb, TCA_OPTIONS);
725 goto nla_put_failure;
726 err = tcf_action_dump_old(skb, a, bind, ref);
728 nla_nest_end(skb, nest);
736 EXPORT_SYMBOL(tcf_action_dump_1);
738 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
742 int err = -EINVAL, i;
745 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
747 nest = nla_nest_start(skb, i + 1);
749 goto nla_put_failure;
750 err = tcf_action_dump_1(skb, a, bind, ref);
753 nla_nest_end(skb, nest);
761 nla_nest_cancel(skb, nest);
765 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
767 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
771 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
776 c->len = nla_len(tb[TCA_ACT_COOKIE]);
781 static bool tcf_action_valid(int action)
783 int opcode = TC_ACT_EXT_OPCODE(action);
786 return action <= TC_ACT_VALUE_MAX;
787 return opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC;
790 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
791 struct nlattr *nla, struct nlattr *est,
792 char *name, int ovr, int bind,
794 struct netlink_ext_ack *extack)
797 struct tc_action_ops *a_o;
798 struct tc_cookie *cookie = NULL;
799 char act_name[IFNAMSIZ];
800 struct nlattr *tb[TCA_ACT_MAX + 1];
805 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
809 kind = tb[TCA_ACT_KIND];
811 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
814 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
815 NL_SET_ERR_MSG(extack, "TC action name too long");
818 if (tb[TCA_ACT_COOKIE]) {
819 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
821 if (cklen > TC_COOKIE_MAX_SIZE) {
822 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
826 cookie = nla_memdup_cookie(tb);
828 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
834 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
835 NL_SET_ERR_MSG(extack, "TC action name too long");
841 a_o = tc_lookup_action_n(act_name);
843 #ifdef CONFIG_MODULES
846 request_module("act_%s", act_name);
850 a_o = tc_lookup_action_n(act_name);
852 /* We dropped the RTNL semaphore in order to
853 * perform the module load. So, even if we
854 * succeeded in loading the module we have to
855 * tell the caller to replay the request. We
856 * indicate this using -EAGAIN.
863 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
868 /* backward compatibility for policer */
870 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
873 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
878 if (!name && tb[TCA_ACT_COOKIE])
879 tcf_set_action_cookie(&a->act_cookie, cookie);
881 /* module count goes up only when brand new policy is created
882 * if it exists and is only bound to in a_o->init() then
883 * ACT_P_CREATED is not returned (a zero is).
885 if (err != ACT_P_CREATED)
886 module_put(a_o->owner);
888 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
889 err = tcf_action_goto_chain_init(a, tp);
891 tcf_action_destroy_1(a, bind);
892 NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
897 if (!tcf_action_valid(a->tcfa_action)) {
898 tcf_action_destroy_1(a, bind);
899 NL_SET_ERR_MSG(extack, "Invalid control action value");
900 return ERR_PTR(-EINVAL);
903 if (!bind && ovr && err == ACT_P_CREATED)
904 refcount_set(&a->tcfa_refcnt, 2);
909 module_put(a_o->owner);
918 /* Returns numbers of initialized actions or negative error. */
920 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
921 struct nlattr *est, char *name, int ovr, int bind,
922 struct tc_action *actions[], size_t *attr_size,
923 bool rtnl_held, struct netlink_ext_ack *extack)
925 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
926 struct tc_action *act;
931 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
935 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
936 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
943 sz += tcf_action_fill_size(act);
944 /* Start from index 0 */
945 actions[i - 1] = act;
948 *attr_size = tcf_action_full_attrs_size(sz);
952 tcf_action_destroy(actions, bind);
956 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
965 /* compat_mode being true specifies a call that is supposed
966 * to add additional backward compatibility statistic TLVs.
969 if (p->type == TCA_OLD_COMPAT)
970 err = gnet_stats_start_copy_compat(skb, 0,
978 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
979 &p->tcfa_lock, &d, TCA_ACT_PAD);
984 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
985 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
986 gnet_stats_copy_queue(&d, p->cpu_qstats,
988 p->tcfa_qstats.qlen) < 0)
991 if (gnet_stats_finish_copy(&d) < 0)
1000 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1001 u32 portid, u32 seq, u16 flags, int event, int bind,
1005 struct nlmsghdr *nlh;
1006 unsigned char *b = skb_tail_pointer(skb);
1007 struct nlattr *nest;
1009 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1011 goto out_nlmsg_trim;
1012 t = nlmsg_data(nlh);
1013 t->tca_family = AF_UNSPEC;
1017 nest = nla_nest_start(skb, TCA_ACT_TAB);
1019 goto out_nlmsg_trim;
1021 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1022 goto out_nlmsg_trim;
1024 nla_nest_end(skb, nest);
1026 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1035 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1036 struct tc_action *actions[], int event,
1037 struct netlink_ext_ack *extack)
1039 struct sk_buff *skb;
1041 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1044 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1046 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1051 return rtnl_unicast(skb, net, portid);
1054 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1055 struct nlmsghdr *n, u32 portid,
1056 struct netlink_ext_ack *extack)
1058 struct nlattr *tb[TCA_ACT_MAX + 1];
1059 const struct tc_action_ops *ops;
1060 struct tc_action *a;
1064 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
1069 if (tb[TCA_ACT_INDEX] == NULL ||
1070 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1071 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1074 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1077 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1078 if (!ops) { /* could happen in batch of actions */
1079 NL_SET_ERR_MSG(extack, "Specified TC action not found");
1083 if (ops->lookup(net, &a, index, extack) == 0)
1086 module_put(ops->owner);
1090 module_put(ops->owner);
1092 return ERR_PTR(err);
1095 static int tca_action_flush(struct net *net, struct nlattr *nla,
1096 struct nlmsghdr *n, u32 portid,
1097 struct netlink_ext_ack *extack)
1099 struct sk_buff *skb;
1101 struct nlmsghdr *nlh;
1103 struct netlink_callback dcb;
1104 struct nlattr *nest;
1105 struct nlattr *tb[TCA_ACT_MAX + 1];
1106 const struct tc_action_ops *ops;
1107 struct nlattr *kind;
1110 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1114 b = skb_tail_pointer(skb);
1116 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
1121 kind = tb[TCA_ACT_KIND];
1122 ops = tc_lookup_action(kind);
1123 if (!ops) { /*some idjot trying to flush unknown action */
1124 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1128 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1131 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1132 goto out_module_put;
1134 t = nlmsg_data(nlh);
1135 t->tca_family = AF_UNSPEC;
1139 nest = nla_nest_start(skb, TCA_ACT_TAB);
1141 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1142 goto out_module_put;
1145 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1147 nla_nest_cancel(skb, nest);
1148 goto out_module_put;
1151 nla_nest_end(skb, nest);
1153 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1154 nlh->nlmsg_flags |= NLM_F_ROOT;
1155 module_put(ops->owner);
1156 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1157 n->nlmsg_flags & NLM_F_ECHO);
1161 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1166 module_put(ops->owner);
1172 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1176 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1177 struct tc_action *a = actions[i];
1178 const struct tc_action_ops *ops = a->ops;
1179 /* Actions can be deleted concurrently so we must save their
1180 * type and id to search again after reference is released.
1182 struct tcf_idrinfo *idrinfo = a->idrinfo;
1183 u32 act_index = a->tcfa_index;
1186 if (tcf_action_put(a)) {
1187 /* last reference, action was deleted concurrently */
1188 module_put(ops->owner);
1192 /* now do the delete */
1193 ret = tcf_idr_delete_index(idrinfo, act_index);
1202 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1203 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1206 struct sk_buff *skb;
1208 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1213 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1215 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1220 /* now do the delete */
1221 ret = tcf_action_delete(net, actions);
1223 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1228 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1229 n->nlmsg_flags & NLM_F_ECHO);
1236 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1237 u32 portid, int event, struct netlink_ext_ack *extack)
1240 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1241 struct tc_action *act;
1242 size_t attr_size = 0;
1243 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1245 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
1249 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1251 return tca_action_flush(net, tb[1], n, portid, extack);
1253 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1257 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1258 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1263 attr_size += tcf_action_fill_size(act);
1264 actions[i - 1] = act;
1267 attr_size = tcf_action_full_attrs_size(attr_size);
1269 if (event == RTM_GETACTION)
1270 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1272 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1278 tcf_action_put_many(actions);
1283 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1284 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1286 struct sk_buff *skb;
1289 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1294 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1295 RTM_NEWACTION, 0, 0) <= 0) {
1296 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1301 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1302 n->nlmsg_flags & NLM_F_ECHO);
1308 static int tcf_action_add(struct net *net, struct nlattr *nla,
1309 struct nlmsghdr *n, u32 portid, int ovr,
1310 struct netlink_ext_ack *extack)
1312 size_t attr_size = 0;
1314 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1316 for (loop = 0; loop < 10; loop++) {
1317 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1318 actions, &attr_size, true, extack);
1325 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1327 tcf_action_put_many(actions);
1332 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1333 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1334 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1335 .validation_data = &tcaa_root_flags_allowed },
1336 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1339 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1340 struct netlink_ext_ack *extack)
1342 struct net *net = sock_net(skb->sk);
1343 struct nlattr *tca[TCA_ROOT_MAX + 1];
1344 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1345 int ret = 0, ovr = 0;
1347 if ((n->nlmsg_type != RTM_GETACTION) &&
1348 !netlink_capable(skb, CAP_NET_ADMIN))
1351 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1356 if (tca[TCA_ACT_TAB] == NULL) {
1357 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1361 /* n->nlmsg_flags & NLM_F_CREATE */
1362 switch (n->nlmsg_type) {
1364 /* we are going to assume all other flags
1365 * imply create only if it doesn't exist
1366 * Note that CREATE | EXCL implies that
1367 * but since we want avoid ambiguity (eg when flags
1368 * is zero) then just set this
1370 if (n->nlmsg_flags & NLM_F_REPLACE)
1372 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1376 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1377 portid, RTM_DELACTION, extack);
1380 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1381 portid, RTM_GETACTION, extack);
1390 static struct nlattr *find_dump_kind(struct nlattr **nla)
1392 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1393 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1394 struct nlattr *kind;
1396 tb1 = nla[TCA_ACT_TAB];
1400 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1401 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1406 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1408 kind = tb2[TCA_ACT_KIND];
1413 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1415 struct net *net = sock_net(skb->sk);
1416 struct nlmsghdr *nlh;
1417 unsigned char *b = skb_tail_pointer(skb);
1418 struct nlattr *nest;
1419 struct tc_action_ops *a_o;
1421 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1422 struct nlattr *tb[TCA_ROOT_MAX + 1];
1423 struct nlattr *count_attr = NULL;
1424 unsigned long jiffy_since = 0;
1425 struct nlattr *kind = NULL;
1426 struct nla_bitfield32 bf;
1427 u32 msecs_since = 0;
1430 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1435 kind = find_dump_kind(tb);
1437 pr_info("tc_dump_action: action bad kind\n");
1441 a_o = tc_lookup_action(kind);
1446 if (tb[TCA_ROOT_FLAGS]) {
1447 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1448 cb->args[2] = bf.value;
1451 if (tb[TCA_ROOT_TIME_DELTA]) {
1452 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1455 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1456 cb->nlh->nlmsg_type, sizeof(*t), 0);
1458 goto out_module_put;
1461 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1463 t = nlmsg_data(nlh);
1464 t->tca_family = AF_UNSPEC;
1467 cb->args[3] = jiffy_since;
1468 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1470 goto out_module_put;
1472 nest = nla_nest_start(skb, TCA_ACT_TAB);
1474 goto out_module_put;
1476 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1478 goto out_module_put;
1481 nla_nest_end(skb, nest);
1483 act_count = cb->args[1];
1484 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1489 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1490 if (NETLINK_CB(cb->skb).portid && ret)
1491 nlh->nlmsg_flags |= NLM_F_MULTI;
1492 module_put(a_o->owner);
1496 module_put(a_o->owner);
1501 struct tcf_action_net {
1502 struct rhashtable egdev_ht;
1505 static unsigned int tcf_action_net_id;
1507 struct tcf_action_egdev_cb {
1508 struct list_head list;
1513 struct tcf_action_egdev {
1514 struct rhash_head ht_node;
1515 const struct net_device *dev;
1516 unsigned int refcnt;
1517 struct list_head cb_list;
1520 static const struct rhashtable_params tcf_action_egdev_ht_params = {
1521 .key_offset = offsetof(struct tcf_action_egdev, dev),
1522 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1523 .key_len = sizeof(const struct net_device *),
1526 static struct tcf_action_egdev *
1527 tcf_action_egdev_lookup(const struct net_device *dev)
1529 struct net *net = dev_net(dev);
1530 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1532 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1533 tcf_action_egdev_ht_params);
1536 static struct tcf_action_egdev *
1537 tcf_action_egdev_get(const struct net_device *dev)
1539 struct tcf_action_egdev *egdev;
1540 struct tcf_action_net *tan;
1542 egdev = tcf_action_egdev_lookup(dev);
1546 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1549 INIT_LIST_HEAD(&egdev->cb_list);
1551 tan = net_generic(dev_net(dev), tcf_action_net_id);
1552 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1553 tcf_action_egdev_ht_params);
1560 static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1562 struct tcf_action_net *tan;
1564 if (--egdev->refcnt)
1566 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1567 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1568 tcf_action_egdev_ht_params);
1572 static struct tcf_action_egdev_cb *
1573 tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1574 tc_setup_cb_t *cb, void *cb_priv)
1576 struct tcf_action_egdev_cb *egdev_cb;
1578 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1579 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1584 static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1585 enum tc_setup_type type,
1586 void *type_data, bool err_stop)
1588 struct tcf_action_egdev_cb *egdev_cb;
1592 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1593 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1604 static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1605 tc_setup_cb_t *cb, void *cb_priv)
1607 struct tcf_action_egdev_cb *egdev_cb;
1609 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1610 if (WARN_ON(egdev_cb))
1612 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1616 egdev_cb->cb_priv = cb_priv;
1617 list_add(&egdev_cb->list, &egdev->cb_list);
1621 static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1622 tc_setup_cb_t *cb, void *cb_priv)
1624 struct tcf_action_egdev_cb *egdev_cb;
1626 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1627 if (WARN_ON(!egdev_cb))
1629 list_del(&egdev_cb->list);
1633 static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1634 tc_setup_cb_t *cb, void *cb_priv)
1636 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1641 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1647 tcf_action_egdev_put(egdev);
1650 int tc_setup_cb_egdev_register(const struct net_device *dev,
1651 tc_setup_cb_t *cb, void *cb_priv)
1656 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1660 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1662 static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1663 tc_setup_cb_t *cb, void *cb_priv)
1665 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1667 if (WARN_ON(!egdev))
1669 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1670 tcf_action_egdev_put(egdev);
1672 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1673 tc_setup_cb_t *cb, void *cb_priv)
1676 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1679 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1681 int tc_setup_cb_egdev_call(const struct net_device *dev,
1682 enum tc_setup_type type, void *type_data,
1685 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1689 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1691 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1693 static __net_init int tcf_action_net_init(struct net *net)
1695 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1697 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1700 static void __net_exit tcf_action_net_exit(struct net *net)
1702 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1704 rhashtable_destroy(&tan->egdev_ht);
1707 static struct pernet_operations tcf_action_net_ops = {
1708 .init = tcf_action_net_init,
1709 .exit = tcf_action_net_exit,
1710 .id = &tcf_action_net_id,
1711 .size = sizeof(struct tcf_action_net),
1714 static int __init tc_action_init(void)
1718 err = register_pernet_subsys(&tcf_action_net_ops);
1722 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1723 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1724 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1730 subsys_initcall(tc_action_init);