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/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/kmod.h>
21 #include <linux/err.h>
22 #include <net/net_namespace.h>
24 #include <net/sch_generic.h>
25 #include <net/act_api.h>
26 #include <net/netlink.h>
28 void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
30 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
31 struct tcf_common **p1p;
33 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
35 write_lock_bh(hinfo->lock);
37 write_unlock_bh(hinfo->lock);
38 gen_kill_estimator(&p->tcfc_bstats,
46 EXPORT_SYMBOL(tcf_hash_destroy);
48 int tcf_hash_release(struct tcf_common *p, int bind,
49 struct tcf_hashinfo *hinfo)
58 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
59 tcf_hash_destroy(p, hinfo);
65 EXPORT_SYMBOL(tcf_hash_release);
67 static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
68 struct tc_action *a, struct tcf_hashinfo *hinfo)
71 int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
74 read_lock_bh(hinfo->lock);
78 for (i = 0; i < (hinfo->hmask + 1); i++) {
79 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
81 for (; p; p = p->tcfc_next) {
88 nest = nla_nest_start(skb, a->order);
91 err = tcf_action_dump_1(skb, a, 0, 0);
94 nlmsg_trim(skb, nest);
97 nla_nest_end(skb, nest);
99 if (n_i >= TCA_ACT_MAX_PRIO)
104 read_unlock_bh(hinfo->lock);
110 nla_nest_cancel(skb, nest);
114 static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
115 struct tcf_hashinfo *hinfo)
117 struct tcf_common *p, *s_p;
121 nest = nla_nest_start(skb, a->order);
123 goto nla_put_failure;
124 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
125 for (i = 0; i < (hinfo->hmask + 1); i++) {
126 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
130 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
131 module_put(a->ops->owner);
136 NLA_PUT_U32(skb, TCA_FCNT, n_i);
137 nla_nest_end(skb, nest);
141 nla_nest_cancel(skb, nest);
145 int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
146 int type, struct tc_action *a)
148 struct tcf_hashinfo *hinfo = a->ops->hinfo;
150 if (type == RTM_DELACTION) {
151 return tcf_del_walker(skb, a, hinfo);
152 } else if (type == RTM_GETACTION) {
153 return tcf_dump_walker(skb, cb, a, hinfo);
155 printk("tcf_generic_walker: unknown action %d\n", type);
159 EXPORT_SYMBOL(tcf_generic_walker);
161 struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
163 struct tcf_common *p;
165 read_lock_bh(hinfo->lock);
166 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
168 if (p->tcfc_index == index)
171 read_unlock_bh(hinfo->lock);
175 EXPORT_SYMBOL(tcf_hash_lookup);
177 u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
184 } while (tcf_hash_lookup(val, hinfo));
186 return (*idx_gen = val);
188 EXPORT_SYMBOL(tcf_hash_new_index);
190 int tcf_hash_search(struct tc_action *a, u32 index)
192 struct tcf_hashinfo *hinfo = a->ops->hinfo;
193 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
201 EXPORT_SYMBOL(tcf_hash_search);
203 struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
204 struct tcf_hashinfo *hinfo)
206 struct tcf_common *p = NULL;
207 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
215 EXPORT_SYMBOL(tcf_hash_check);
217 struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
218 struct tc_action *a, int size, int bind,
219 u32 *idx_gen, struct tcf_hashinfo *hinfo)
221 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
224 return ERR_PTR(-ENOMEM);
229 spin_lock_init(&p->tcfc_lock);
230 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
231 p->tcfc_tm.install = jiffies;
232 p->tcfc_tm.lastuse = jiffies;
234 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
242 a->priv = (void *) p;
245 EXPORT_SYMBOL(tcf_hash_create);
247 void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
249 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
251 write_lock_bh(hinfo->lock);
252 p->tcfc_next = hinfo->htab[h];
254 write_unlock_bh(hinfo->lock);
256 EXPORT_SYMBOL(tcf_hash_insert);
258 static struct tc_action_ops *act_base = NULL;
259 static DEFINE_RWLOCK(act_mod_lock);
261 int tcf_register_action(struct tc_action_ops *act)
263 struct tc_action_ops *a, **ap;
265 write_lock(&act_mod_lock);
266 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
267 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
268 write_unlock(&act_mod_lock);
274 write_unlock(&act_mod_lock);
277 EXPORT_SYMBOL(tcf_register_action);
279 int tcf_unregister_action(struct tc_action_ops *act)
281 struct tc_action_ops *a, **ap;
284 write_lock(&act_mod_lock);
285 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
293 write_unlock(&act_mod_lock);
296 EXPORT_SYMBOL(tcf_unregister_action);
299 static struct tc_action_ops *tc_lookup_action_n(char *kind)
301 struct tc_action_ops *a = NULL;
304 read_lock(&act_mod_lock);
305 for (a = act_base; a; a = a->next) {
306 if (strcmp(kind, a->kind) == 0) {
307 if (!try_module_get(a->owner)) {
308 read_unlock(&act_mod_lock);
314 read_unlock(&act_mod_lock);
319 /* lookup by nlattr */
320 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
322 struct tc_action_ops *a = NULL;
325 read_lock(&act_mod_lock);
326 for (a = act_base; a; a = a->next) {
327 if (nla_strcmp(kind, a->kind) == 0) {
328 if (!try_module_get(a->owner)) {
329 read_unlock(&act_mod_lock);
335 read_unlock(&act_mod_lock);
342 static struct tc_action_ops *tc_lookup_action_id(u32 type)
344 struct tc_action_ops *a = NULL;
347 read_lock(&act_mod_lock);
348 for (a = act_base; a; a = a->next) {
349 if (a->type == type) {
350 if (!try_module_get(a->owner)) {
351 read_unlock(&act_mod_lock);
357 read_unlock(&act_mod_lock);
363 int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
364 struct tcf_result *res)
369 if (skb->tc_verd & TC_NCLS) {
370 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
374 while ((a = act) != NULL) {
376 if (a->ops && a->ops->act) {
377 ret = a->ops->act(skb, a, res);
378 if (TC_MUNGED & skb->tc_verd) {
379 /* copied already, allow trampling */
380 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
381 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
383 if (ret == TC_ACT_REPEAT)
384 goto repeat; /* we need a ttl - JHS */
385 if (ret != TC_ACT_PIPE)
393 EXPORT_SYMBOL(tcf_action_exec);
395 void tcf_action_destroy(struct tc_action *act, int bind)
399 for (a = act; a; a = act) {
400 if (a->ops && a->ops->cleanup) {
401 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
402 module_put(a->ops->owner);
405 } else { /*FIXME: Remove later - catch insertion bugs*/
406 printk("tcf_action_destroy: BUG? destroying NULL ops\n");
414 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
418 if (a->ops == NULL || a->ops->dump == NULL)
420 return a->ops->dump(skb, a, bind, ref);
424 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
427 unsigned char *b = skb_tail_pointer(skb);
430 if (a->ops == NULL || a->ops->dump == NULL)
433 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
434 if (tcf_action_copy_stats(skb, a, 0))
435 goto nla_put_failure;
436 nest = nla_nest_start(skb, TCA_OPTIONS);
438 goto nla_put_failure;
439 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
440 nla_nest_end(skb, nest);
448 EXPORT_SYMBOL(tcf_action_dump_1);
451 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
457 while ((a = act) != NULL) {
459 nest = nla_nest_start(skb, a->order);
461 goto nla_put_failure;
462 err = tcf_action_dump_1(skb, a, bind, ref);
465 nla_nest_end(skb, nest);
473 nla_nest_cancel(skb, nest);
477 struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
478 char *name, int ovr, int bind)
481 struct tc_action_ops *a_o;
482 char act_name[IFNAMSIZ];
483 struct nlattr *tb[TCA_ACT_MAX+1];
488 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
492 kind = tb[TCA_ACT_KIND];
495 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
499 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
503 a_o = tc_lookup_action_n(act_name);
505 #ifdef CONFIG_MODULES
507 request_module("act_%s", act_name);
510 a_o = tc_lookup_action_n(act_name);
512 /* We dropped the RTNL semaphore in order to
513 * perform the module load. So, even if we
514 * succeeded in loading the module we have to
515 * tell the caller to replay the request. We
516 * indicate this using -EAGAIN.
528 a = kzalloc(sizeof(*a), GFP_KERNEL);
532 /* backward compatibility for policer */
534 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
536 err = a_o->init(nla, est, a, ovr, bind);
540 /* module count goes up only when brand new policy is created
541 if it exists and is only bound to in a_o->init() then
542 ACT_P_CREATED is not returned (a zero is).
544 if (err != ACT_P_CREATED)
545 module_put(a_o->owner);
553 module_put(a_o->owner);
558 struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
559 char *name, int ovr, int bind)
561 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
562 struct tc_action *head = NULL, *act, *act_prev = NULL;
566 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
570 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
571 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
579 act_prev->next = act;
586 tcf_action_destroy(head, bind);
590 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
595 struct tcf_act_hdr *h = a->priv;
600 /* compat_mode being true specifies a call that is supposed
601 * to add additional backward compatibility statistic TLVs.
604 if (a->type == TCA_OLD_COMPAT)
605 err = gnet_stats_start_copy_compat(skb, 0,
606 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
610 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
616 if (a->ops != NULL && a->ops->get_stats != NULL)
617 if (a->ops->get_stats(skb, a) < 0)
620 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
621 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
622 &h->tcf_rate_est) < 0 ||
623 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
626 if (gnet_stats_finish_copy(&d) < 0)
636 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
637 u16 flags, int event, int bind, int ref)
640 struct nlmsghdr *nlh;
641 unsigned char *b = skb_tail_pointer(skb);
644 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
647 t->tca_family = AF_UNSPEC;
651 nest = nla_nest_start(skb, TCA_ACT_TAB);
653 goto nla_put_failure;
655 if (tcf_action_dump(skb, a, bind, ref) < 0)
656 goto nla_put_failure;
658 nla_nest_end(skb, nest);
660 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
670 act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
674 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
677 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
682 return rtnl_unicast(skb, &init_net, pid);
685 static struct tc_action *
686 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
688 struct nlattr *tb[TCA_ACT_MAX+1];
693 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
698 if (tb[TCA_ACT_INDEX] == NULL ||
699 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
701 index = nla_get_u32(tb[TCA_ACT_INDEX]);
704 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
709 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
712 if (a->ops->lookup == NULL)
715 if (a->ops->lookup(a, index) == 0)
718 module_put(a->ops->owner);
722 module_put(a->ops->owner);
729 static void cleanup_a(struct tc_action *act)
733 for (a = act; a; a = act) {
739 static struct tc_action *create_a(int i)
741 struct tc_action *act;
743 act = kzalloc(sizeof(*act), GFP_KERNEL);
745 printk("create_a: failed to alloc!\n");
752 static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
756 struct nlmsghdr *nlh;
758 struct netlink_callback dcb;
760 struct nlattr *tb[TCA_ACT_MAX+1];
762 struct tc_action *a = create_a(0);
766 printk("tca_action_flush: couldnt create tc_action\n");
770 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
772 printk("tca_action_flush: failed skb alloc\n");
777 b = skb_tail_pointer(skb);
779 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
784 kind = tb[TCA_ACT_KIND];
785 a->ops = tc_lookup_action(kind);
789 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
791 t->tca_family = AF_UNSPEC;
795 nest = nla_nest_start(skb, TCA_ACT_TAB);
797 goto nla_put_failure;
799 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
801 goto nla_put_failure;
805 nla_nest_end(skb, nest);
807 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
808 nlh->nlmsg_flags |= NLM_F_ROOT;
809 module_put(a->ops->owner);
811 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
819 module_put(a->ops->owner);
828 tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
831 struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
832 struct tc_action *head = NULL, *act, *act_prev = NULL;
834 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
838 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
840 return tca_action_flush(tb[1], n, pid);
845 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
846 act = tcf_action_get_1(tb[i], n, pid);
856 act_prev->next = act;
860 if (event == RTM_GETACTION)
861 ret = act_get_notify(pid, n, head, event);
865 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
871 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
878 /* now do the delete */
879 tcf_action_destroy(head, 0);
880 ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC,
881 n->nlmsg_flags&NLM_F_ECHO);
891 static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
895 struct nlmsghdr *nlh;
901 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
905 b = skb_tail_pointer(skb);
907 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
909 t->tca_family = AF_UNSPEC;
913 nest = nla_nest_start(skb, TCA_ACT_TAB);
915 goto nla_put_failure;
917 if (tcf_action_dump(skb, a, 0, 0) < 0)
918 goto nla_put_failure;
920 nla_nest_end(skb, nest);
922 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
923 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
925 err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
938 tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
941 struct tc_action *act;
943 u32 seq = n->nlmsg_seq;
945 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
953 /* dump then free all the actions after update; inserted policy
956 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
957 for (a = act; a; a = act) {
965 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
967 struct net *net = sock_net(skb->sk);
968 struct nlattr *tca[TCA_ACT_MAX + 1];
969 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
970 int ret = 0, ovr = 0;
972 if (!net_eq(net, &init_net))
975 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
979 if (tca[TCA_ACT_TAB] == NULL) {
980 printk("tc_ctl_action: received NO action attribs\n");
984 /* n->nlmsg_flags&NLM_F_CREATE
986 switch (n->nlmsg_type) {
988 /* we are going to assume all other flags
989 * imply create only if it doesnt exist
990 * Note that CREATE | EXCL implies that
991 * but since we want avoid ambiguity (eg when flags
992 * is zero) then just set this
994 if (n->nlmsg_flags&NLM_F_REPLACE)
997 ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr);
1002 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION);
1005 ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION);
1014 static struct nlattr *
1015 find_dump_kind(const struct nlmsghdr *n)
1017 struct nlattr *tb1, *tb2[TCA_ACT_MAX+1];
1018 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1019 struct nlattr *nla[TCAA_MAX + 1];
1020 struct nlattr *kind;
1022 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1024 tb1 = nla[TCA_ACT_TAB];
1028 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1029 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1034 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1035 nla_len(tb[1]), NULL) < 0)
1037 kind = tb2[TCA_ACT_KIND];
1043 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1045 struct net *net = sock_net(skb->sk);
1046 struct nlmsghdr *nlh;
1047 unsigned char *b = skb_tail_pointer(skb);
1048 struct nlattr *nest;
1049 struct tc_action_ops *a_o;
1052 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1053 struct nlattr *kind = find_dump_kind(cb->nlh);
1055 if (!net_eq(net, &init_net))
1059 printk("tc_dump_action: action bad kind\n");
1063 a_o = tc_lookup_action(kind);
1068 memset(&a, 0, sizeof(struct tc_action));
1071 if (a_o->walk == NULL) {
1072 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
1073 goto nla_put_failure;
1076 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1077 cb->nlh->nlmsg_type, sizeof(*t));
1078 t = NLMSG_DATA(nlh);
1079 t->tca_family = AF_UNSPEC;
1083 nest = nla_nest_start(skb, TCA_ACT_TAB);
1085 goto nla_put_failure;
1087 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1089 goto nla_put_failure;
1092 nla_nest_end(skb, nest);
1095 nla_nest_cancel(skb, nest);
1097 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1098 if (NETLINK_CB(cb->skb).pid && ret)
1099 nlh->nlmsg_flags |= NLM_F_MULTI;
1100 module_put(a_o->owner);
1105 module_put(a_o->owner);
1110 static int __init tc_action_init(void)
1112 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
1113 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
1114 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
1119 subsys_initcall(tc_action_init);