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(tp->chain->block, chain_index, true);
45 static void tcf_action_goto_chain_fini(struct tc_action *a)
47 tcf_chain_put(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 /* XXX: For standalone actions, we don't need a RCU grace period either, because
59 * actions are always connected to filters and filters are already destroyed in
60 * RCU callbacks, so after a RCU grace period actions are already disconnected
61 * from filters. Readers later can not find us.
63 static void free_tcf(struct tc_action *p)
65 free_percpu(p->cpu_bstats);
66 free_percpu(p->cpu_qstats);
69 kfree(p->act_cookie->data);
73 tcf_action_goto_chain_fini(p);
78 static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
80 spin_lock(&idrinfo->lock);
81 idr_remove(&idrinfo->action_idr, p->tcfa_index);
82 spin_unlock(&idrinfo->lock);
83 gen_kill_estimator(&p->tcfa_rate_est);
87 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
96 else if (strict && p->tcfa_bindcnt > 0)
100 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
103 tcf_idr_remove(p->idrinfo, p);
110 EXPORT_SYMBOL(__tcf_idr_release);
112 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
117 cookie_len = nla_total_size(act->act_cookie->len);
119 return nla_total_size(0) /* action number nested */
120 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
121 + cookie_len /* TCA_ACT_COOKIE */
122 + nla_total_size(0) /* TCA_ACT_STATS nested */
123 /* TCA_STATS_BASIC */
124 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
125 /* TCA_STATS_QUEUE */
126 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
127 + nla_total_size(0) /* TCA_OPTIONS nested */
128 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
131 static size_t tcf_action_full_attrs_size(size_t sz)
133 return NLMSG_HDRLEN /* struct nlmsghdr */
134 + sizeof(struct tcamsg)
135 + nla_total_size(0) /* TCA_ACT_TAB nested */
139 static size_t tcf_action_fill_size(const struct tc_action *act)
141 size_t sz = tcf_action_shared_attrs_size(act);
143 if (act->ops->get_fill_size)
144 return act->ops->get_fill_size(act) + sz;
148 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
149 struct netlink_callback *cb)
151 int err = 0, index = -1, s_i = 0, n_i = 0;
152 u32 act_flags = cb->args[2];
153 unsigned long jiffy_since = cb->args[3];
155 struct idr *idr = &idrinfo->action_idr;
157 unsigned long id = 1;
159 spin_lock(&idrinfo->lock);
163 idr_for_each_entry_ul(idr, p, id) {
169 time_after(jiffy_since,
170 (unsigned long)p->tcfa_tm.lastuse))
173 nest = nla_nest_start(skb, n_i);
176 goto nla_put_failure;
178 err = tcf_action_dump_1(skb, p, 0, 0);
181 nlmsg_trim(skb, nest);
184 nla_nest_end(skb, nest);
186 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
187 n_i >= TCA_ACT_MAX_PRIO)
192 cb->args[0] = index + 1;
194 spin_unlock(&idrinfo->lock);
196 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
202 nla_nest_cancel(skb, nest);
206 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
207 const struct tc_action_ops *ops)
212 struct idr *idr = &idrinfo->action_idr;
214 unsigned long id = 1;
216 nest = nla_nest_start(skb, 0);
218 goto nla_put_failure;
219 if (nla_put_string(skb, TCA_KIND, ops->kind))
220 goto nla_put_failure;
222 idr_for_each_entry_ul(idr, p, id) {
223 ret = __tcf_idr_release(p, false, true);
224 if (ret == ACT_P_DELETED) {
225 module_put(ops->owner);
227 } else if (ret < 0) {
228 goto nla_put_failure;
231 if (nla_put_u32(skb, TCA_FCNT, n_i))
232 goto nla_put_failure;
233 nla_nest_end(skb, nest);
237 nla_nest_cancel(skb, nest);
241 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
242 struct netlink_callback *cb, int type,
243 const struct tc_action_ops *ops,
244 struct netlink_ext_ack *extack)
246 struct tcf_idrinfo *idrinfo = tn->idrinfo;
248 if (type == RTM_DELACTION) {
249 return tcf_del_walker(idrinfo, skb, ops);
250 } else if (type == RTM_GETACTION) {
251 return tcf_dump_walker(idrinfo, skb, cb);
253 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
254 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
258 EXPORT_SYMBOL(tcf_generic_walker);
260 static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
262 struct tc_action *p = NULL;
264 spin_lock(&idrinfo->lock);
265 p = idr_find(&idrinfo->action_idr, index);
266 spin_unlock(&idrinfo->lock);
271 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
273 struct tcf_idrinfo *idrinfo = tn->idrinfo;
274 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
282 EXPORT_SYMBOL(tcf_idr_search);
284 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
287 struct tcf_idrinfo *idrinfo = tn->idrinfo;
288 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
299 EXPORT_SYMBOL(tcf_idr_check);
301 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
302 struct tc_action **a, const struct tc_action_ops *ops,
303 int bind, bool cpustats)
305 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
306 struct tcf_idrinfo *idrinfo = tn->idrinfo;
307 struct idr *idr = &idrinfo->action_idr;
317 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
320 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
324 spin_lock_init(&p->tcfa_lock);
325 idr_preload(GFP_KERNEL);
326 spin_lock(&idrinfo->lock);
327 /* user doesn't specify an index */
330 err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
332 err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
334 spin_unlock(&idrinfo->lock);
339 p->tcfa_index = index;
340 p->tcfa_tm.install = jiffies;
341 p->tcfa_tm.lastuse = jiffies;
342 p->tcfa_tm.firstuse = 0;
344 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
346 &p->tcfa_lock, NULL, est);
351 p->idrinfo = idrinfo;
353 INIT_LIST_HEAD(&p->list);
357 idr_remove(idr, index);
359 free_percpu(p->cpu_qstats);
361 free_percpu(p->cpu_bstats);
366 EXPORT_SYMBOL(tcf_idr_create);
368 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
370 struct tcf_idrinfo *idrinfo = tn->idrinfo;
372 spin_lock(&idrinfo->lock);
373 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
374 spin_unlock(&idrinfo->lock);
376 EXPORT_SYMBOL(tcf_idr_insert);
378 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
379 struct tcf_idrinfo *idrinfo)
381 struct idr *idr = &idrinfo->action_idr;
384 unsigned long id = 1;
386 idr_for_each_entry_ul(idr, p, id) {
387 ret = __tcf_idr_release(p, false, true);
388 if (ret == ACT_P_DELETED)
389 module_put(ops->owner);
393 idr_destroy(&idrinfo->action_idr);
395 EXPORT_SYMBOL(tcf_idrinfo_destroy);
397 static LIST_HEAD(act_base);
398 static DEFINE_RWLOCK(act_mod_lock);
400 int tcf_register_action(struct tc_action_ops *act,
401 struct pernet_operations *ops)
403 struct tc_action_ops *a;
406 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
409 /* We have to register pernet ops before making the action ops visible,
410 * otherwise tcf_action_init_1() could get a partially initialized
413 ret = register_pernet_subsys(ops);
417 write_lock(&act_mod_lock);
418 list_for_each_entry(a, &act_base, head) {
419 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
420 write_unlock(&act_mod_lock);
421 unregister_pernet_subsys(ops);
425 list_add_tail(&act->head, &act_base);
426 write_unlock(&act_mod_lock);
430 EXPORT_SYMBOL(tcf_register_action);
432 int tcf_unregister_action(struct tc_action_ops *act,
433 struct pernet_operations *ops)
435 struct tc_action_ops *a;
438 write_lock(&act_mod_lock);
439 list_for_each_entry(a, &act_base, head) {
441 list_del(&act->head);
446 write_unlock(&act_mod_lock);
448 unregister_pernet_subsys(ops);
451 EXPORT_SYMBOL(tcf_unregister_action);
454 static struct tc_action_ops *tc_lookup_action_n(char *kind)
456 struct tc_action_ops *a, *res = NULL;
459 read_lock(&act_mod_lock);
460 list_for_each_entry(a, &act_base, head) {
461 if (strcmp(kind, a->kind) == 0) {
462 if (try_module_get(a->owner))
467 read_unlock(&act_mod_lock);
472 /* lookup by nlattr */
473 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
475 struct tc_action_ops *a, *res = NULL;
478 read_lock(&act_mod_lock);
479 list_for_each_entry(a, &act_base, head) {
480 if (nla_strcmp(kind, a->kind) == 0) {
481 if (try_module_get(a->owner))
486 read_unlock(&act_mod_lock);
491 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
492 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
493 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
494 int nr_actions, struct tcf_result *res)
497 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
501 if (skb_skip_tc_classify(skb))
505 for (i = 0; i < nr_actions; i++) {
506 const struct tc_action *a = actions[i];
508 if (jmp_prgcnt > 0) {
513 ret = a->ops->act(skb, a, res);
514 if (ret == TC_ACT_REPEAT)
515 goto repeat; /* we need a ttl - JHS */
517 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
518 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
519 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
520 /* faulty opcode, stop pipeline */
525 goto restart_act_graph;
526 else /* faulty graph, stop pipeline */
529 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
530 tcf_action_goto_chain_exec(a, res);
533 if (ret != TC_ACT_PIPE)
539 EXPORT_SYMBOL(tcf_action_exec);
541 int tcf_action_destroy(struct list_head *actions, int bind)
543 const struct tc_action_ops *ops;
544 struct tc_action *a, *tmp;
547 list_for_each_entry_safe(a, tmp, actions, list) {
549 ret = __tcf_idr_release(a, bind, true);
550 if (ret == ACT_P_DELETED)
551 module_put(ops->owner);
559 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
561 return a->ops->dump(skb, a, bind, ref);
565 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
568 unsigned char *b = skb_tail_pointer(skb);
571 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
572 goto nla_put_failure;
573 if (tcf_action_copy_stats(skb, a, 0))
574 goto nla_put_failure;
576 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
577 a->act_cookie->data))
578 goto nla_put_failure;
581 nest = nla_nest_start(skb, TCA_OPTIONS);
583 goto nla_put_failure;
584 err = tcf_action_dump_old(skb, a, bind, ref);
586 nla_nest_end(skb, nest);
594 EXPORT_SYMBOL(tcf_action_dump_1);
596 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
603 list_for_each_entry(a, actions, list) {
604 nest = nla_nest_start(skb, a->order);
606 goto nla_put_failure;
607 err = tcf_action_dump_1(skb, a, bind, ref);
610 nla_nest_end(skb, nest);
618 nla_nest_cancel(skb, nest);
622 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
624 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
628 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
633 c->len = nla_len(tb[TCA_ACT_COOKIE]);
638 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
639 struct nlattr *nla, struct nlattr *est,
640 char *name, int ovr, int bind,
641 struct netlink_ext_ack *extack)
644 struct tc_action_ops *a_o;
645 struct tc_cookie *cookie = NULL;
646 char act_name[IFNAMSIZ];
647 struct nlattr *tb[TCA_ACT_MAX + 1];
652 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
656 kind = tb[TCA_ACT_KIND];
658 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
661 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
662 NL_SET_ERR_MSG(extack, "TC action name too long");
665 if (tb[TCA_ACT_COOKIE]) {
666 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
668 if (cklen > TC_COOKIE_MAX_SIZE) {
669 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
673 cookie = nla_memdup_cookie(tb);
675 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
681 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
682 NL_SET_ERR_MSG(extack, "TC action name too long");
688 a_o = tc_lookup_action_n(act_name);
690 #ifdef CONFIG_MODULES
692 request_module("act_%s", act_name);
695 a_o = tc_lookup_action_n(act_name);
697 /* We dropped the RTNL semaphore in order to
698 * perform the module load. So, even if we
699 * succeeded in loading the module we have to
700 * tell the caller to replay the request. We
701 * indicate this using -EAGAIN.
708 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
713 /* backward compatibility for policer */
715 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
718 err = a_o->init(net, nla, est, &a, ovr, bind, extack);
722 if (name == NULL && tb[TCA_ACT_COOKIE]) {
724 kfree(a->act_cookie->data);
725 kfree(a->act_cookie);
727 a->act_cookie = cookie;
730 /* module count goes up only when brand new policy is created
731 * if it exists and is only bound to in a_o->init() then
732 * ACT_P_CREATED is not returned (a zero is).
734 if (err != ACT_P_CREATED)
735 module_put(a_o->owner);
737 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
738 err = tcf_action_goto_chain_init(a, tp);
742 list_add_tail(&a->list, &actions);
743 tcf_action_destroy(&actions, bind);
744 NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
752 module_put(a_o->owner);
761 static void cleanup_a(struct list_head *actions, int ovr)
768 list_for_each_entry(a, actions, list)
772 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
773 struct nlattr *est, char *name, int ovr, int bind,
774 struct list_head *actions, size_t *attr_size,
775 struct netlink_ext_ack *extack)
777 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
778 struct tc_action *act;
783 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
787 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
788 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
795 sz += tcf_action_fill_size(act);
798 list_add_tail(&act->list, actions);
801 *attr_size = tcf_action_full_attrs_size(sz);
803 /* Remove the temp refcnt which was necessary to protect against
804 * destroying an existing action which was being replaced
806 cleanup_a(actions, ovr);
810 tcf_action_destroy(actions, bind);
814 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
823 /* compat_mode being true specifies a call that is supposed
824 * to add additional backward compatibility statistic TLVs.
827 if (p->type == TCA_OLD_COMPAT)
828 err = gnet_stats_start_copy_compat(skb, 0,
836 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
837 &p->tcfa_lock, &d, TCA_ACT_PAD);
842 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
843 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
844 gnet_stats_copy_queue(&d, p->cpu_qstats,
846 p->tcfa_qstats.qlen) < 0)
849 if (gnet_stats_finish_copy(&d) < 0)
858 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
859 u32 portid, u32 seq, u16 flags, int event, int bind,
863 struct nlmsghdr *nlh;
864 unsigned char *b = skb_tail_pointer(skb);
867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
871 t->tca_family = AF_UNSPEC;
875 nest = nla_nest_start(skb, TCA_ACT_TAB);
879 if (tcf_action_dump(skb, actions, bind, ref) < 0)
882 nla_nest_end(skb, nest);
884 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
893 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
894 struct list_head *actions, int event,
895 struct netlink_ext_ack *extack)
899 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
902 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
904 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
909 return rtnl_unicast(skb, net, portid);
912 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
913 struct nlmsghdr *n, u32 portid,
914 struct netlink_ext_ack *extack)
916 struct nlattr *tb[TCA_ACT_MAX + 1];
917 const struct tc_action_ops *ops;
922 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
927 if (tb[TCA_ACT_INDEX] == NULL ||
928 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
929 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
932 index = nla_get_u32(tb[TCA_ACT_INDEX]);
935 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
936 if (!ops) { /* could happen in batch of actions */
937 NL_SET_ERR_MSG(extack, "Specified TC action not found");
941 if (ops->lookup(net, &a, index, extack) == 0)
944 module_put(ops->owner);
948 module_put(ops->owner);
953 static int tca_action_flush(struct net *net, struct nlattr *nla,
954 struct nlmsghdr *n, u32 portid,
955 struct netlink_ext_ack *extack)
959 struct nlmsghdr *nlh;
961 struct netlink_callback dcb;
963 struct nlattr *tb[TCA_ACT_MAX + 1];
964 const struct tc_action_ops *ops;
968 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
972 b = skb_tail_pointer(skb);
974 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
979 kind = tb[TCA_ACT_KIND];
980 ops = tc_lookup_action(kind);
981 if (!ops) { /*some idjot trying to flush unknown action */
982 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
986 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
989 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
993 t->tca_family = AF_UNSPEC;
997 nest = nla_nest_start(skb, TCA_ACT_TAB);
999 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1000 goto out_module_put;
1003 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1005 nla_nest_cancel(skb, nest);
1006 goto out_module_put;
1009 nla_nest_end(skb, nest);
1011 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1012 nlh->nlmsg_flags |= NLM_F_ROOT;
1013 module_put(ops->owner);
1014 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1015 n->nlmsg_flags & NLM_F_ECHO);
1019 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1024 module_put(ops->owner);
1031 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1032 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1035 struct sk_buff *skb;
1037 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1042 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1044 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1049 /* now do the delete */
1050 ret = tcf_action_destroy(actions, 0);
1052 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1057 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1058 n->nlmsg_flags & NLM_F_ECHO);
1065 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1066 u32 portid, int event, struct netlink_ext_ack *extack)
1069 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1070 struct tc_action *act;
1071 size_t attr_size = 0;
1074 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
1078 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1080 return tca_action_flush(net, tb[1], n, portid, extack);
1082 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1086 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1087 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1093 attr_size += tcf_action_fill_size(act);
1094 list_add_tail(&act->list, &actions);
1097 attr_size = tcf_action_full_attrs_size(attr_size);
1099 if (event == RTM_GETACTION)
1100 ret = tcf_get_notify(net, portid, n, &actions, event, extack);
1102 ret = tcf_del_notify(net, n, &actions, portid, attr_size, extack);
1108 if (event != RTM_GETACTION)
1109 tcf_action_destroy(&actions, 0);
1114 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1115 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1117 struct sk_buff *skb;
1120 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1125 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1126 RTM_NEWACTION, 0, 0) <= 0) {
1127 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1132 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1133 n->nlmsg_flags & NLM_F_ECHO);
1139 static int tcf_action_add(struct net *net, struct nlattr *nla,
1140 struct nlmsghdr *n, u32 portid, int ovr,
1141 struct netlink_ext_ack *extack)
1143 size_t attr_size = 0;
1147 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions,
1148 &attr_size, extack);
1152 return tcf_add_notify(net, n, &actions, portid, attr_size, extack);
1155 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1156 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1157 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1158 .validation_data = &tcaa_root_flags_allowed },
1159 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1162 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1163 struct netlink_ext_ack *extack)
1165 struct net *net = sock_net(skb->sk);
1166 struct nlattr *tca[TCA_ROOT_MAX + 1];
1167 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1168 int ret = 0, ovr = 0;
1170 if ((n->nlmsg_type != RTM_GETACTION) &&
1171 !netlink_capable(skb, CAP_NET_ADMIN))
1174 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1179 if (tca[TCA_ACT_TAB] == NULL) {
1180 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1184 /* n->nlmsg_flags & NLM_F_CREATE */
1185 switch (n->nlmsg_type) {
1187 /* we are going to assume all other flags
1188 * imply create only if it doesn't exist
1189 * Note that CREATE | EXCL implies that
1190 * but since we want avoid ambiguity (eg when flags
1191 * is zero) then just set this
1193 if (n->nlmsg_flags & NLM_F_REPLACE)
1196 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1202 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1203 portid, RTM_DELACTION, extack);
1206 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1207 portid, RTM_GETACTION, extack);
1216 static struct nlattr *find_dump_kind(struct nlattr **nla)
1218 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1219 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1220 struct nlattr *kind;
1222 tb1 = nla[TCA_ACT_TAB];
1226 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1227 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1232 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1234 kind = tb2[TCA_ACT_KIND];
1239 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1241 struct net *net = sock_net(skb->sk);
1242 struct nlmsghdr *nlh;
1243 unsigned char *b = skb_tail_pointer(skb);
1244 struct nlattr *nest;
1245 struct tc_action_ops *a_o;
1247 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1248 struct nlattr *tb[TCA_ROOT_MAX + 1];
1249 struct nlattr *count_attr = NULL;
1250 unsigned long jiffy_since = 0;
1251 struct nlattr *kind = NULL;
1252 struct nla_bitfield32 bf;
1253 u32 msecs_since = 0;
1256 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1261 kind = find_dump_kind(tb);
1263 pr_info("tc_dump_action: action bad kind\n");
1267 a_o = tc_lookup_action(kind);
1272 if (tb[TCA_ROOT_FLAGS]) {
1273 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1274 cb->args[2] = bf.value;
1277 if (tb[TCA_ROOT_TIME_DELTA]) {
1278 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1281 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1282 cb->nlh->nlmsg_type, sizeof(*t), 0);
1284 goto out_module_put;
1287 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1289 t = nlmsg_data(nlh);
1290 t->tca_family = AF_UNSPEC;
1293 cb->args[3] = jiffy_since;
1294 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1296 goto out_module_put;
1298 nest = nla_nest_start(skb, TCA_ACT_TAB);
1300 goto out_module_put;
1302 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1304 goto out_module_put;
1307 nla_nest_end(skb, nest);
1309 act_count = cb->args[1];
1310 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1315 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1316 if (NETLINK_CB(cb->skb).portid && ret)
1317 nlh->nlmsg_flags |= NLM_F_MULTI;
1318 module_put(a_o->owner);
1322 module_put(a_o->owner);
1327 struct tcf_action_net {
1328 struct rhashtable egdev_ht;
1331 static unsigned int tcf_action_net_id;
1333 struct tcf_action_egdev_cb {
1334 struct list_head list;
1339 struct tcf_action_egdev {
1340 struct rhash_head ht_node;
1341 const struct net_device *dev;
1342 unsigned int refcnt;
1343 struct list_head cb_list;
1346 static const struct rhashtable_params tcf_action_egdev_ht_params = {
1347 .key_offset = offsetof(struct tcf_action_egdev, dev),
1348 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1349 .key_len = sizeof(const struct net_device *),
1352 static struct tcf_action_egdev *
1353 tcf_action_egdev_lookup(const struct net_device *dev)
1355 struct net *net = dev_net(dev);
1356 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1358 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1359 tcf_action_egdev_ht_params);
1362 static struct tcf_action_egdev *
1363 tcf_action_egdev_get(const struct net_device *dev)
1365 struct tcf_action_egdev *egdev;
1366 struct tcf_action_net *tan;
1368 egdev = tcf_action_egdev_lookup(dev);
1372 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1375 INIT_LIST_HEAD(&egdev->cb_list);
1377 tan = net_generic(dev_net(dev), tcf_action_net_id);
1378 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1379 tcf_action_egdev_ht_params);
1386 static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1388 struct tcf_action_net *tan;
1390 if (--egdev->refcnt)
1392 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1393 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1394 tcf_action_egdev_ht_params);
1398 static struct tcf_action_egdev_cb *
1399 tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1400 tc_setup_cb_t *cb, void *cb_priv)
1402 struct tcf_action_egdev_cb *egdev_cb;
1404 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1405 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1410 static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1411 enum tc_setup_type type,
1412 void *type_data, bool err_stop)
1414 struct tcf_action_egdev_cb *egdev_cb;
1418 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1419 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1430 static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1431 tc_setup_cb_t *cb, void *cb_priv)
1433 struct tcf_action_egdev_cb *egdev_cb;
1435 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1436 if (WARN_ON(egdev_cb))
1438 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1442 egdev_cb->cb_priv = cb_priv;
1443 list_add(&egdev_cb->list, &egdev->cb_list);
1447 static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1448 tc_setup_cb_t *cb, void *cb_priv)
1450 struct tcf_action_egdev_cb *egdev_cb;
1452 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1453 if (WARN_ON(!egdev_cb))
1455 list_del(&egdev_cb->list);
1459 static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1460 tc_setup_cb_t *cb, void *cb_priv)
1462 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1467 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1473 tcf_action_egdev_put(egdev);
1476 int tc_setup_cb_egdev_register(const struct net_device *dev,
1477 tc_setup_cb_t *cb, void *cb_priv)
1482 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1486 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1488 static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1489 tc_setup_cb_t *cb, void *cb_priv)
1491 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1493 if (WARN_ON(!egdev))
1495 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1496 tcf_action_egdev_put(egdev);
1498 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1499 tc_setup_cb_t *cb, void *cb_priv)
1502 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1505 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1507 int tc_setup_cb_egdev_call(const struct net_device *dev,
1508 enum tc_setup_type type, void *type_data,
1511 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1515 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1517 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1519 static __net_init int tcf_action_net_init(struct net *net)
1521 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1523 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1526 static void __net_exit tcf_action_net_exit(struct net *net)
1528 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1530 rhashtable_destroy(&tan->egdev_ht);
1533 static struct pernet_operations tcf_action_net_ops = {
1534 .init = tcf_action_net_init,
1535 .exit = tcf_action_net_exit,
1536 .id = &tcf_action_net_id,
1537 .size = sizeof(struct tcf_action_net),
1540 static int __init tc_action_init(void)
1544 err = register_pernet_subsys(&tcf_action_net_ops);
1548 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1549 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1550 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1556 subsys_initcall(tc_action_init);