]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/sched/act_api.c
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 <net/net_namespace.h>
26 #include <net/sch_generic.h>
27 #include <net/pkt_cls.h>
28 #include <net/act_api.h>
29 #include <net/netlink.h>
31 static int tcf_action_goto_chain_init(struct tc_action
*a
, struct tcf_proto
*tp
)
33 u32 chain_index
= a
->tcfa_action
& TC_ACT_EXT_VAL_MASK
;
37 a
->goto_chain
= tcf_chain_get(tp
->chain
->block
, chain_index
, true);
43 static void tcf_action_goto_chain_fini(struct tc_action
*a
)
45 tcf_chain_put(a
->goto_chain
);
48 static void tcf_action_goto_chain_exec(const struct tc_action
*a
,
49 struct tcf_result
*res
)
51 const struct tcf_chain
*chain
= a
->goto_chain
;
53 res
->goto_tp
= rcu_dereference_bh(chain
->filter_chain
);
56 static void free_tcf(struct rcu_head
*head
)
58 struct tc_action
*p
= container_of(head
, struct tc_action
, tcfa_rcu
);
60 free_percpu(p
->cpu_bstats
);
61 free_percpu(p
->cpu_qstats
);
64 kfree(p
->act_cookie
->data
);
68 tcf_action_goto_chain_fini(p
);
73 static void tcf_hash_destroy(struct tcf_hashinfo
*hinfo
, struct tc_action
*p
)
75 spin_lock_bh(&hinfo
->lock
);
76 hlist_del(&p
->tcfa_head
);
77 spin_unlock_bh(&hinfo
->lock
);
78 gen_kill_estimator(&p
->tcfa_rate_est
);
80 * gen_estimator est_timer() might access p->tcfa_lock
81 * or bstats, wait a RCU grace period before freeing p
83 call_rcu(&p
->tcfa_rcu
, free_tcf
);
86 int __tcf_hash_release(struct tc_action
*p
, bool bind
, bool strict
)
93 else if (strict
&& p
->tcfa_bindcnt
> 0)
97 if (p
->tcfa_bindcnt
<= 0 && p
->tcfa_refcnt
<= 0) {
99 p
->ops
->cleanup(p
, bind
);
100 tcf_hash_destroy(p
->hinfo
, p
);
107 EXPORT_SYMBOL(__tcf_hash_release
);
109 static int tcf_dump_walker(struct tcf_hashinfo
*hinfo
, struct sk_buff
*skb
,
110 struct netlink_callback
*cb
)
112 int err
= 0, index
= -1, i
= 0, s_i
= 0, n_i
= 0;
115 spin_lock_bh(&hinfo
->lock
);
119 for (i
= 0; i
< (hinfo
->hmask
+ 1); i
++) {
120 struct hlist_head
*head
;
123 head
= &hinfo
->htab
[tcf_hash(i
, hinfo
->hmask
)];
125 hlist_for_each_entry_rcu(p
, head
, tcfa_head
) {
130 nest
= nla_nest_start(skb
, n_i
);
132 goto nla_put_failure
;
133 err
= tcf_action_dump_1(skb
, p
, 0, 0);
136 nlmsg_trim(skb
, nest
);
139 nla_nest_end(skb
, nest
);
141 if (n_i
>= TCA_ACT_MAX_PRIO
)
146 spin_unlock_bh(&hinfo
->lock
);
152 nla_nest_cancel(skb
, nest
);
156 static int tcf_del_walker(struct tcf_hashinfo
*hinfo
, struct sk_buff
*skb
,
157 const struct tc_action_ops
*ops
)
163 nest
= nla_nest_start(skb
, 0);
165 goto nla_put_failure
;
166 if (nla_put_string(skb
, TCA_KIND
, ops
->kind
))
167 goto nla_put_failure
;
168 for (i
= 0; i
< (hinfo
->hmask
+ 1); i
++) {
169 struct hlist_head
*head
;
170 struct hlist_node
*n
;
173 head
= &hinfo
->htab
[tcf_hash(i
, hinfo
->hmask
)];
174 hlist_for_each_entry_safe(p
, n
, head
, tcfa_head
) {
175 ret
= __tcf_hash_release(p
, false, true);
176 if (ret
== ACT_P_DELETED
) {
177 module_put(p
->ops
->owner
);
180 goto nla_put_failure
;
183 if (nla_put_u32(skb
, TCA_FCNT
, n_i
))
184 goto nla_put_failure
;
185 nla_nest_end(skb
, nest
);
189 nla_nest_cancel(skb
, nest
);
193 int tcf_generic_walker(struct tc_action_net
*tn
, struct sk_buff
*skb
,
194 struct netlink_callback
*cb
, int type
,
195 const struct tc_action_ops
*ops
)
197 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
199 if (type
== RTM_DELACTION
) {
200 return tcf_del_walker(hinfo
, skb
, ops
);
201 } else if (type
== RTM_GETACTION
) {
202 return tcf_dump_walker(hinfo
, skb
, cb
);
204 WARN(1, "tcf_generic_walker: unknown action %d\n", type
);
208 EXPORT_SYMBOL(tcf_generic_walker
);
210 static struct tc_action
*tcf_hash_lookup(u32 index
, struct tcf_hashinfo
*hinfo
)
212 struct tc_action
*p
= NULL
;
213 struct hlist_head
*head
;
215 spin_lock_bh(&hinfo
->lock
);
216 head
= &hinfo
->htab
[tcf_hash(index
, hinfo
->hmask
)];
217 hlist_for_each_entry_rcu(p
, head
, tcfa_head
)
218 if (p
->tcfa_index
== index
)
220 spin_unlock_bh(&hinfo
->lock
);
225 u32
tcf_hash_new_index(struct tc_action_net
*tn
)
227 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
228 u32 val
= hinfo
->index
;
233 } while (tcf_hash_lookup(val
, hinfo
));
238 EXPORT_SYMBOL(tcf_hash_new_index
);
240 int tcf_hash_search(struct tc_action_net
*tn
, struct tc_action
**a
, u32 index
)
242 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
243 struct tc_action
*p
= tcf_hash_lookup(index
, hinfo
);
251 EXPORT_SYMBOL(tcf_hash_search
);
253 bool tcf_hash_check(struct tc_action_net
*tn
, u32 index
, struct tc_action
**a
,
256 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
257 struct tc_action
*p
= NULL
;
259 if (index
&& (p
= tcf_hash_lookup(index
, hinfo
)) != NULL
) {
268 EXPORT_SYMBOL(tcf_hash_check
);
270 void tcf_hash_cleanup(struct tc_action
*a
, struct nlattr
*est
)
273 gen_kill_estimator(&a
->tcfa_rate_est
);
274 call_rcu(&a
->tcfa_rcu
, free_tcf
);
276 EXPORT_SYMBOL(tcf_hash_cleanup
);
278 int tcf_hash_create(struct tc_action_net
*tn
, u32 index
, struct nlattr
*est
,
279 struct tc_action
**a
, const struct tc_action_ops
*ops
,
280 int bind
, bool cpustats
)
282 struct tc_action
*p
= kzalloc(ops
->size
, GFP_KERNEL
);
283 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
293 p
->cpu_bstats
= netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu
);
294 if (!p
->cpu_bstats
) {
299 p
->cpu_qstats
= alloc_percpu(struct gnet_stats_queue
);
300 if (!p
->cpu_qstats
) {
302 free_percpu(p
->cpu_bstats
);
306 spin_lock_init(&p
->tcfa_lock
);
307 INIT_HLIST_NODE(&p
->tcfa_head
);
308 p
->tcfa_index
= index
? index
: tcf_hash_new_index(tn
);
309 p
->tcfa_tm
.install
= jiffies
;
310 p
->tcfa_tm
.lastuse
= jiffies
;
311 p
->tcfa_tm
.firstuse
= 0;
313 err
= gen_new_estimator(&p
->tcfa_bstats
, p
->cpu_bstats
,
315 &p
->tcfa_lock
, NULL
, est
);
317 free_percpu(p
->cpu_qstats
);
324 INIT_LIST_HEAD(&p
->list
);
328 EXPORT_SYMBOL(tcf_hash_create
);
330 void tcf_hash_insert(struct tc_action_net
*tn
, struct tc_action
*a
)
332 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
333 unsigned int h
= tcf_hash(a
->tcfa_index
, hinfo
->hmask
);
335 spin_lock_bh(&hinfo
->lock
);
336 hlist_add_head(&a
->tcfa_head
, &hinfo
->htab
[h
]);
337 spin_unlock_bh(&hinfo
->lock
);
339 EXPORT_SYMBOL(tcf_hash_insert
);
341 void tcf_hashinfo_destroy(const struct tc_action_ops
*ops
,
342 struct tcf_hashinfo
*hinfo
)
346 for (i
= 0; i
< hinfo
->hmask
+ 1; i
++) {
348 struct hlist_node
*n
;
350 hlist_for_each_entry_safe(p
, n
, &hinfo
->htab
[i
], tcfa_head
) {
353 ret
= __tcf_hash_release(p
, false, true);
354 if (ret
== ACT_P_DELETED
)
355 module_put(ops
->owner
);
362 EXPORT_SYMBOL(tcf_hashinfo_destroy
);
364 static LIST_HEAD(act_base
);
365 static DEFINE_RWLOCK(act_mod_lock
);
367 int tcf_register_action(struct tc_action_ops
*act
,
368 struct pernet_operations
*ops
)
370 struct tc_action_ops
*a
;
373 if (!act
->act
|| !act
->dump
|| !act
->init
|| !act
->walk
|| !act
->lookup
)
376 /* We have to register pernet ops before making the action ops visible,
377 * otherwise tcf_action_init_1() could get a partially initialized
380 ret
= register_pernet_subsys(ops
);
384 write_lock(&act_mod_lock
);
385 list_for_each_entry(a
, &act_base
, head
) {
386 if (act
->type
== a
->type
|| (strcmp(act
->kind
, a
->kind
) == 0)) {
387 write_unlock(&act_mod_lock
);
388 unregister_pernet_subsys(ops
);
392 list_add_tail(&act
->head
, &act_base
);
393 write_unlock(&act_mod_lock
);
397 EXPORT_SYMBOL(tcf_register_action
);
399 int tcf_unregister_action(struct tc_action_ops
*act
,
400 struct pernet_operations
*ops
)
402 struct tc_action_ops
*a
;
405 write_lock(&act_mod_lock
);
406 list_for_each_entry(a
, &act_base
, head
) {
408 list_del(&act
->head
);
413 write_unlock(&act_mod_lock
);
415 unregister_pernet_subsys(ops
);
418 EXPORT_SYMBOL(tcf_unregister_action
);
421 static struct tc_action_ops
*tc_lookup_action_n(char *kind
)
423 struct tc_action_ops
*a
, *res
= NULL
;
426 read_lock(&act_mod_lock
);
427 list_for_each_entry(a
, &act_base
, head
) {
428 if (strcmp(kind
, a
->kind
) == 0) {
429 if (try_module_get(a
->owner
))
434 read_unlock(&act_mod_lock
);
439 /* lookup by nlattr */
440 static struct tc_action_ops
*tc_lookup_action(struct nlattr
*kind
)
442 struct tc_action_ops
*a
, *res
= NULL
;
445 read_lock(&act_mod_lock
);
446 list_for_each_entry(a
, &act_base
, head
) {
447 if (nla_strcmp(kind
, a
->kind
) == 0) {
448 if (try_module_get(a
->owner
))
453 read_unlock(&act_mod_lock
);
458 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
459 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
460 int tcf_action_exec(struct sk_buff
*skb
, struct tc_action
**actions
,
461 int nr_actions
, struct tcf_result
*res
)
465 u32 jmp_ttl
= TCA_ACT_MAX_PRIO
; /*matches actions per filter */
467 if (skb_skip_tc_classify(skb
))
471 for (i
= 0; i
< nr_actions
; i
++) {
472 const struct tc_action
*a
= actions
[i
];
474 if (jmp_prgcnt
> 0) {
479 ret
= a
->ops
->act(skb
, a
, res
);
480 if (ret
== TC_ACT_REPEAT
)
481 goto repeat
; /* we need a ttl - JHS */
483 if (TC_ACT_EXT_CMP(ret
, TC_ACT_JUMP
)) {
484 jmp_prgcnt
= ret
& TCA_ACT_MAX_PRIO_MASK
;
485 if (!jmp_prgcnt
|| (jmp_prgcnt
> nr_actions
)) {
486 /* faulty opcode, stop pipeline */
491 goto restart_act_graph
;
492 else /* faulty graph, stop pipeline */
495 } else if (TC_ACT_EXT_CMP(ret
, TC_ACT_GOTO_CHAIN
)) {
496 tcf_action_goto_chain_exec(a
, res
);
499 if (ret
!= TC_ACT_PIPE
)
505 EXPORT_SYMBOL(tcf_action_exec
);
507 int tcf_action_destroy(struct list_head
*actions
, int bind
)
509 struct tc_action
*a
, *tmp
;
512 list_for_each_entry_safe(a
, tmp
, actions
, list
) {
513 ret
= __tcf_hash_release(a
, bind
, true);
514 if (ret
== ACT_P_DELETED
)
515 module_put(a
->ops
->owner
);
523 tcf_action_dump_old(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
525 return a
->ops
->dump(skb
, a
, bind
, ref
);
529 tcf_action_dump_1(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
532 unsigned char *b
= skb_tail_pointer(skb
);
535 if (nla_put_string(skb
, TCA_KIND
, a
->ops
->kind
))
536 goto nla_put_failure
;
537 if (tcf_action_copy_stats(skb
, a
, 0))
538 goto nla_put_failure
;
540 if (nla_put(skb
, TCA_ACT_COOKIE
, a
->act_cookie
->len
,
541 a
->act_cookie
->data
))
542 goto nla_put_failure
;
545 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
547 goto nla_put_failure
;
548 err
= tcf_action_dump_old(skb
, a
, bind
, ref
);
550 nla_nest_end(skb
, nest
);
558 EXPORT_SYMBOL(tcf_action_dump_1
);
560 int tcf_action_dump(struct sk_buff
*skb
, struct list_head
*actions
,
567 list_for_each_entry(a
, actions
, list
) {
568 nest
= nla_nest_start(skb
, a
->order
);
570 goto nla_put_failure
;
571 err
= tcf_action_dump_1(skb
, a
, bind
, ref
);
574 nla_nest_end(skb
, nest
);
582 nla_nest_cancel(skb
, nest
);
586 static struct tc_cookie
*nla_memdup_cookie(struct nlattr
**tb
)
588 struct tc_cookie
*c
= kzalloc(sizeof(*c
), GFP_KERNEL
);
592 c
->data
= nla_memdup(tb
[TCA_ACT_COOKIE
], GFP_KERNEL
);
597 c
->len
= nla_len(tb
[TCA_ACT_COOKIE
]);
602 struct tc_action
*tcf_action_init_1(struct net
*net
, struct tcf_proto
*tp
,
603 struct nlattr
*nla
, struct nlattr
*est
,
604 char *name
, int ovr
, int bind
)
607 struct tc_action_ops
*a_o
;
608 struct tc_cookie
*cookie
= NULL
;
609 char act_name
[IFNAMSIZ
];
610 struct nlattr
*tb
[TCA_ACT_MAX
+ 1];
615 err
= nla_parse_nested(tb
, TCA_ACT_MAX
, nla
, NULL
, NULL
);
619 kind
= tb
[TCA_ACT_KIND
];
622 if (nla_strlcpy(act_name
, kind
, IFNAMSIZ
) >= IFNAMSIZ
)
624 if (tb
[TCA_ACT_COOKIE
]) {
625 int cklen
= nla_len(tb
[TCA_ACT_COOKIE
]);
627 if (cklen
> TC_COOKIE_MAX_SIZE
)
630 cookie
= nla_memdup_cookie(tb
);
638 if (strlcpy(act_name
, name
, IFNAMSIZ
) >= IFNAMSIZ
)
642 a_o
= tc_lookup_action_n(act_name
);
644 #ifdef CONFIG_MODULES
646 request_module("act_%s", act_name
);
649 a_o
= tc_lookup_action_n(act_name
);
651 /* We dropped the RTNL semaphore in order to
652 * perform the module load. So, even if we
653 * succeeded in loading the module we have to
654 * tell the caller to replay the request. We
655 * indicate this using -EAGAIN.
666 /* backward compatibility for policer */
668 err
= a_o
->init(net
, tb
[TCA_ACT_OPTIONS
], est
, &a
, ovr
, bind
);
670 err
= a_o
->init(net
, nla
, est
, &a
, ovr
, bind
);
674 if (name
== NULL
&& tb
[TCA_ACT_COOKIE
]) {
676 kfree(a
->act_cookie
->data
);
677 kfree(a
->act_cookie
);
679 a
->act_cookie
= cookie
;
682 /* module count goes up only when brand new policy is created
683 * if it exists and is only bound to in a_o->init() then
684 * ACT_P_CREATED is not returned (a zero is).
686 if (err
!= ACT_P_CREATED
)
687 module_put(a_o
->owner
);
689 if (TC_ACT_EXT_CMP(a
->tcfa_action
, TC_ACT_GOTO_CHAIN
)) {
690 err
= tcf_action_goto_chain_init(a
, tp
);
694 list_add_tail(&a
->list
, &actions
);
695 tcf_action_destroy(&actions
, bind
);
703 module_put(a_o
->owner
);
712 static void cleanup_a(struct list_head
*actions
, int ovr
)
719 list_for_each_entry(a
, actions
, list
)
723 int tcf_action_init(struct net
*net
, struct tcf_proto
*tp
, struct nlattr
*nla
,
724 struct nlattr
*est
, char *name
, int ovr
, int bind
,
725 struct list_head
*actions
)
727 struct nlattr
*tb
[TCA_ACT_MAX_PRIO
+ 1];
728 struct tc_action
*act
;
732 err
= nla_parse_nested(tb
, TCA_ACT_MAX_PRIO
, nla
, NULL
, NULL
);
736 for (i
= 1; i
<= TCA_ACT_MAX_PRIO
&& tb
[i
]; i
++) {
737 act
= tcf_action_init_1(net
, tp
, tb
[i
], est
, name
, ovr
, bind
);
745 list_add_tail(&act
->list
, actions
);
748 /* Remove the temp refcnt which was necessary to protect against
749 * destroying an existing action which was being replaced
751 cleanup_a(actions
, ovr
);
755 tcf_action_destroy(actions
, bind
);
759 int tcf_action_copy_stats(struct sk_buff
*skb
, struct tc_action
*p
,
768 /* compat_mode being true specifies a call that is supposed
769 * to add additional backward compatibility statistic TLVs.
772 if (p
->type
== TCA_OLD_COMPAT
)
773 err
= gnet_stats_start_copy_compat(skb
, 0,
781 err
= gnet_stats_start_copy(skb
, TCA_ACT_STATS
,
782 &p
->tcfa_lock
, &d
, TCA_ACT_PAD
);
787 if (gnet_stats_copy_basic(NULL
, &d
, p
->cpu_bstats
, &p
->tcfa_bstats
) < 0 ||
788 gnet_stats_copy_rate_est(&d
, &p
->tcfa_rate_est
) < 0 ||
789 gnet_stats_copy_queue(&d
, p
->cpu_qstats
,
791 p
->tcfa_qstats
.qlen
) < 0)
794 if (gnet_stats_finish_copy(&d
) < 0)
803 static int tca_get_fill(struct sk_buff
*skb
, struct list_head
*actions
,
804 u32 portid
, u32 seq
, u16 flags
, int event
, int bind
,
808 struct nlmsghdr
*nlh
;
809 unsigned char *b
= skb_tail_pointer(skb
);
812 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(*t
), flags
);
816 t
->tca_family
= AF_UNSPEC
;
820 nest
= nla_nest_start(skb
, TCA_ACT_TAB
);
824 if (tcf_action_dump(skb
, actions
, bind
, ref
) < 0)
827 nla_nest_end(skb
, nest
);
829 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
838 act_get_notify(struct net
*net
, u32 portid
, struct nlmsghdr
*n
,
839 struct list_head
*actions
, int event
)
843 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
846 if (tca_get_fill(skb
, actions
, portid
, n
->nlmsg_seq
, 0, event
,
852 return rtnl_unicast(skb
, net
, portid
);
855 static struct tc_action
*tcf_action_get_1(struct net
*net
, struct nlattr
*nla
,
856 struct nlmsghdr
*n
, u32 portid
)
858 struct nlattr
*tb
[TCA_ACT_MAX
+ 1];
859 const struct tc_action_ops
*ops
;
864 err
= nla_parse_nested(tb
, TCA_ACT_MAX
, nla
, NULL
, NULL
);
869 if (tb
[TCA_ACT_INDEX
] == NULL
||
870 nla_len(tb
[TCA_ACT_INDEX
]) < sizeof(index
))
872 index
= nla_get_u32(tb
[TCA_ACT_INDEX
]);
875 ops
= tc_lookup_action(tb
[TCA_ACT_KIND
]);
876 if (!ops
) /* could happen in batch of actions */
879 if (ops
->lookup(net
, &a
, index
) == 0)
882 module_put(ops
->owner
);
886 module_put(ops
->owner
);
891 static int tca_action_flush(struct net
*net
, struct nlattr
*nla
,
892 struct nlmsghdr
*n
, u32 portid
)
896 struct nlmsghdr
*nlh
;
898 struct netlink_callback dcb
;
900 struct nlattr
*tb
[TCA_ACT_MAX
+ 1];
901 const struct tc_action_ops
*ops
;
905 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
907 pr_debug("tca_action_flush: failed skb alloc\n");
911 b
= skb_tail_pointer(skb
);
913 err
= nla_parse_nested(tb
, TCA_ACT_MAX
, nla
, NULL
, NULL
);
918 kind
= tb
[TCA_ACT_KIND
];
919 ops
= tc_lookup_action(kind
);
920 if (!ops
) /*some idjot trying to flush unknown action */
923 nlh
= nlmsg_put(skb
, portid
, n
->nlmsg_seq
, RTM_DELACTION
,
928 t
->tca_family
= AF_UNSPEC
;
932 nest
= nla_nest_start(skb
, TCA_ACT_TAB
);
936 err
= ops
->walk(net
, skb
, &dcb
, RTM_DELACTION
, ops
);
940 nla_nest_end(skb
, nest
);
942 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
943 nlh
->nlmsg_flags
|= NLM_F_ROOT
;
944 module_put(ops
->owner
);
945 err
= rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
946 n
->nlmsg_flags
& NLM_F_ECHO
);
953 module_put(ops
->owner
);
960 tcf_del_notify(struct net
*net
, struct nlmsghdr
*n
, struct list_head
*actions
,
966 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
970 if (tca_get_fill(skb
, actions
, portid
, n
->nlmsg_seq
, 0, RTM_DELACTION
,
976 /* now do the delete */
977 ret
= tcf_action_destroy(actions
, 0);
983 ret
= rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
984 n
->nlmsg_flags
& NLM_F_ECHO
);
991 tca_action_gd(struct net
*net
, struct nlattr
*nla
, struct nlmsghdr
*n
,
992 u32 portid
, int event
)
995 struct nlattr
*tb
[TCA_ACT_MAX_PRIO
+ 1];
996 struct tc_action
*act
;
999 ret
= nla_parse_nested(tb
, TCA_ACT_MAX_PRIO
, nla
, NULL
, NULL
);
1003 if (event
== RTM_DELACTION
&& n
->nlmsg_flags
& NLM_F_ROOT
) {
1005 return tca_action_flush(net
, tb
[1], n
, portid
);
1010 for (i
= 1; i
<= TCA_ACT_MAX_PRIO
&& tb
[i
]; i
++) {
1011 act
= tcf_action_get_1(net
, tb
[i
], n
, portid
);
1017 list_add_tail(&act
->list
, &actions
);
1020 if (event
== RTM_GETACTION
)
1021 ret
= act_get_notify(net
, portid
, n
, &actions
, event
);
1023 ret
= tcf_del_notify(net
, n
, &actions
, portid
);
1029 if (event
!= RTM_GETACTION
)
1030 tcf_action_destroy(&actions
, 0);
1035 tcf_add_notify(struct net
*net
, struct nlmsghdr
*n
, struct list_head
*actions
,
1038 struct sk_buff
*skb
;
1041 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1045 if (tca_get_fill(skb
, actions
, portid
, n
->nlmsg_seq
, n
->nlmsg_flags
,
1046 RTM_NEWACTION
, 0, 0) <= 0) {
1051 err
= rtnetlink_send(skb
, net
, portid
, RTNLGRP_TC
,
1052 n
->nlmsg_flags
& NLM_F_ECHO
);
1058 static int tcf_action_add(struct net
*net
, struct nlattr
*nla
,
1059 struct nlmsghdr
*n
, u32 portid
, int ovr
)
1064 ret
= tcf_action_init(net
, NULL
, nla
, NULL
, NULL
, ovr
, 0, &actions
);
1068 return tcf_add_notify(net
, n
, &actions
, portid
);
1071 static int tc_ctl_action(struct sk_buff
*skb
, struct nlmsghdr
*n
,
1072 struct netlink_ext_ack
*extack
)
1074 struct net
*net
= sock_net(skb
->sk
);
1075 struct nlattr
*tca
[TCA_ACT_MAX
+ 1];
1076 u32 portid
= skb
? NETLINK_CB(skb
).portid
: 0;
1077 int ret
= 0, ovr
= 0;
1079 if ((n
->nlmsg_type
!= RTM_GETACTION
) &&
1080 !netlink_capable(skb
, CAP_NET_ADMIN
))
1083 ret
= nlmsg_parse(n
, sizeof(struct tcamsg
), tca
, TCA_ACT_MAX
, NULL
,
1088 if (tca
[TCA_ACT_TAB
] == NULL
) {
1089 pr_notice("tc_ctl_action: received NO action attribs\n");
1093 /* n->nlmsg_flags & NLM_F_CREATE */
1094 switch (n
->nlmsg_type
) {
1096 /* we are going to assume all other flags
1097 * imply create only if it doesn't exist
1098 * Note that CREATE | EXCL implies that
1099 * but since we want avoid ambiguity (eg when flags
1100 * is zero) then just set this
1102 if (n
->nlmsg_flags
& NLM_F_REPLACE
)
1105 ret
= tcf_action_add(net
, tca
[TCA_ACT_TAB
], n
, portid
, ovr
);
1110 ret
= tca_action_gd(net
, tca
[TCA_ACT_TAB
], n
,
1111 portid
, RTM_DELACTION
);
1114 ret
= tca_action_gd(net
, tca
[TCA_ACT_TAB
], n
,
1115 portid
, RTM_GETACTION
);
1124 static struct nlattr
*find_dump_kind(const struct nlmsghdr
*n
)
1126 struct nlattr
*tb1
, *tb2
[TCA_ACT_MAX
+ 1];
1127 struct nlattr
*tb
[TCA_ACT_MAX_PRIO
+ 1];
1128 struct nlattr
*nla
[TCAA_MAX
+ 1];
1129 struct nlattr
*kind
;
1131 if (nlmsg_parse(n
, sizeof(struct tcamsg
), nla
, TCAA_MAX
,
1134 tb1
= nla
[TCA_ACT_TAB
];
1138 if (nla_parse(tb
, TCA_ACT_MAX_PRIO
, nla_data(tb1
),
1139 NLMSG_ALIGN(nla_len(tb1
)), NULL
, NULL
) < 0)
1144 if (nla_parse_nested(tb2
, TCA_ACT_MAX
, tb
[1], NULL
, NULL
) < 0)
1146 kind
= tb2
[TCA_ACT_KIND
];
1151 static int tc_dump_action(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1153 struct net
*net
= sock_net(skb
->sk
);
1154 struct nlmsghdr
*nlh
;
1155 unsigned char *b
= skb_tail_pointer(skb
);
1156 struct nlattr
*nest
;
1157 struct tc_action_ops
*a_o
;
1159 struct tcamsg
*t
= (struct tcamsg
*) nlmsg_data(cb
->nlh
);
1160 struct nlattr
*kind
= find_dump_kind(cb
->nlh
);
1163 pr_info("tc_dump_action: action bad kind\n");
1167 a_o
= tc_lookup_action(kind
);
1171 nlh
= nlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
1172 cb
->nlh
->nlmsg_type
, sizeof(*t
), 0);
1174 goto out_module_put
;
1175 t
= nlmsg_data(nlh
);
1176 t
->tca_family
= AF_UNSPEC
;
1180 nest
= nla_nest_start(skb
, TCA_ACT_TAB
);
1182 goto out_module_put
;
1184 ret
= a_o
->walk(net
, skb
, cb
, RTM_GETACTION
, a_o
);
1186 goto out_module_put
;
1189 nla_nest_end(skb
, nest
);
1194 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - b
;
1195 if (NETLINK_CB(cb
->skb
).portid
&& ret
)
1196 nlh
->nlmsg_flags
|= NLM_F_MULTI
;
1197 module_put(a_o
->owner
);
1201 module_put(a_o
->owner
);
1206 static int __init
tc_action_init(void)
1208 rtnl_register(PF_UNSPEC
, RTM_NEWACTION
, tc_ctl_action
, NULL
, NULL
);
1209 rtnl_register(PF_UNSPEC
, RTM_DELACTION
, tc_ctl_action
, NULL
, NULL
);
1210 rtnl_register(PF_UNSPEC
, RTM_GETACTION
, tc_ctl_action
, tc_dump_action
,
1216 subsys_initcall(tc_action_init
);