1 // SPDX-License-Identifier: GPL-2.0-only
3 * net/core/fib_rules.c Generic Routing Rules
5 * Authors: Thomas Graf <tgraf@suug.ch>
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/list.h>
12 #include <linux/module.h>
13 #include <net/net_namespace.h>
15 #include <net/fib_rules.h>
16 #include <net/ip_tunnels.h>
18 static const struct fib_kuid_range fib_kuid_range_unset
= {
23 bool fib_rule_matchall(const struct fib_rule
*rule
)
25 if (rule
->iifindex
|| rule
->oifindex
|| rule
->mark
|| rule
->tun_id
||
28 if (rule
->suppress_ifgroup
!= -1 || rule
->suppress_prefixlen
!= -1)
30 if (!uid_eq(rule
->uid_range
.start
, fib_kuid_range_unset
.start
) ||
31 !uid_eq(rule
->uid_range
.end
, fib_kuid_range_unset
.end
))
33 if (fib_rule_port_range_set(&rule
->sport_range
))
35 if (fib_rule_port_range_set(&rule
->dport_range
))
39 EXPORT_SYMBOL_GPL(fib_rule_matchall
);
41 int fib_default_rule_add(struct fib_rules_ops
*ops
,
42 u32 pref
, u32 table
, u32 flags
)
46 r
= kzalloc(ops
->rule_size
, GFP_KERNEL
);
50 refcount_set(&r
->refcnt
, 1);
51 r
->action
= FR_ACT_TO_TBL
;
55 r
->proto
= RTPROT_KERNEL
;
56 r
->fr_net
= ops
->fro_net
;
57 r
->uid_range
= fib_kuid_range_unset
;
59 r
->suppress_prefixlen
= -1;
60 r
->suppress_ifgroup
= -1;
62 /* The lock is not required here, the list in unreacheable
63 * at the moment this function is called */
64 list_add_tail(&r
->list
, &ops
->rules_list
);
67 EXPORT_SYMBOL(fib_default_rule_add
);
69 static u32
fib_default_rule_pref(struct fib_rules_ops
*ops
)
71 struct list_head
*pos
;
72 struct fib_rule
*rule
;
74 if (!list_empty(&ops
->rules_list
)) {
75 pos
= ops
->rules_list
.next
;
76 if (pos
->next
!= &ops
->rules_list
) {
77 rule
= list_entry(pos
->next
, struct fib_rule
, list
);
79 return rule
->pref
- 1;
86 static void notify_rule_change(int event
, struct fib_rule
*rule
,
87 struct fib_rules_ops
*ops
, struct nlmsghdr
*nlh
,
90 static struct fib_rules_ops
*lookup_rules_ops(struct net
*net
, int family
)
92 struct fib_rules_ops
*ops
;
95 list_for_each_entry_rcu(ops
, &net
->rules_ops
, list
) {
96 if (ops
->family
== family
) {
97 if (!try_module_get(ops
->owner
))
108 static void rules_ops_put(struct fib_rules_ops
*ops
)
111 module_put(ops
->owner
);
114 static void flush_route_cache(struct fib_rules_ops
*ops
)
116 if (ops
->flush_cache
)
117 ops
->flush_cache(ops
);
120 static int __fib_rules_register(struct fib_rules_ops
*ops
)
123 struct fib_rules_ops
*o
;
128 if (ops
->rule_size
< sizeof(struct fib_rule
))
131 if (ops
->match
== NULL
|| ops
->configure
== NULL
||
132 ops
->compare
== NULL
|| ops
->fill
== NULL
||
136 spin_lock(&net
->rules_mod_lock
);
137 list_for_each_entry(o
, &net
->rules_ops
, list
)
138 if (ops
->family
== o
->family
)
141 list_add_tail_rcu(&ops
->list
, &net
->rules_ops
);
144 spin_unlock(&net
->rules_mod_lock
);
149 struct fib_rules_ops
*
150 fib_rules_register(const struct fib_rules_ops
*tmpl
, struct net
*net
)
152 struct fib_rules_ops
*ops
;
155 ops
= kmemdup(tmpl
, sizeof(*ops
), GFP_KERNEL
);
157 return ERR_PTR(-ENOMEM
);
159 INIT_LIST_HEAD(&ops
->rules_list
);
162 err
= __fib_rules_register(ops
);
170 EXPORT_SYMBOL_GPL(fib_rules_register
);
172 static void fib_rules_cleanup_ops(struct fib_rules_ops
*ops
)
174 struct fib_rule
*rule
, *tmp
;
176 list_for_each_entry_safe(rule
, tmp
, &ops
->rules_list
, list
) {
177 list_del_rcu(&rule
->list
);
184 void fib_rules_unregister(struct fib_rules_ops
*ops
)
186 struct net
*net
= ops
->fro_net
;
188 spin_lock(&net
->rules_mod_lock
);
189 list_del_rcu(&ops
->list
);
190 spin_unlock(&net
->rules_mod_lock
);
192 fib_rules_cleanup_ops(ops
);
195 EXPORT_SYMBOL_GPL(fib_rules_unregister
);
197 static int uid_range_set(struct fib_kuid_range
*range
)
199 return uid_valid(range
->start
) && uid_valid(range
->end
);
202 static struct fib_kuid_range
nla_get_kuid_range(struct nlattr
**tb
)
204 struct fib_rule_uid_range
*in
;
205 struct fib_kuid_range out
;
207 in
= (struct fib_rule_uid_range
*)nla_data(tb
[FRA_UID_RANGE
]);
209 out
.start
= make_kuid(current_user_ns(), in
->start
);
210 out
.end
= make_kuid(current_user_ns(), in
->end
);
215 static int nla_put_uid_range(struct sk_buff
*skb
, struct fib_kuid_range
*range
)
217 struct fib_rule_uid_range out
= {
218 from_kuid_munged(current_user_ns(), range
->start
),
219 from_kuid_munged(current_user_ns(), range
->end
)
222 return nla_put(skb
, FRA_UID_RANGE
, sizeof(out
), &out
);
225 static int nla_get_port_range(struct nlattr
*pattr
,
226 struct fib_rule_port_range
*port_range
)
228 const struct fib_rule_port_range
*pr
= nla_data(pattr
);
230 if (!fib_rule_port_range_valid(pr
))
233 port_range
->start
= pr
->start
;
234 port_range
->end
= pr
->end
;
239 static int nla_put_port_range(struct sk_buff
*skb
, int attrtype
,
240 struct fib_rule_port_range
*range
)
242 return nla_put(skb
, attrtype
, sizeof(*range
), range
);
245 static int fib_rule_match(struct fib_rule
*rule
, struct fib_rules_ops
*ops
,
246 struct flowi
*fl
, int flags
,
247 struct fib_lookup_arg
*arg
)
251 if (rule
->iifindex
&& (rule
->iifindex
!= fl
->flowi_iif
))
254 if (rule
->oifindex
&& (rule
->oifindex
!= fl
->flowi_oif
))
257 if ((rule
->mark
^ fl
->flowi_mark
) & rule
->mark_mask
)
260 if (rule
->tun_id
&& (rule
->tun_id
!= fl
->flowi_tun_key
.tun_id
))
263 if (rule
->l3mdev
&& !l3mdev_fib_rule_match(rule
->fr_net
, fl
, arg
))
266 if (uid_lt(fl
->flowi_uid
, rule
->uid_range
.start
) ||
267 uid_gt(fl
->flowi_uid
, rule
->uid_range
.end
))
270 ret
= ops
->match(rule
, fl
, flags
);
272 return (rule
->flags
& FIB_RULE_INVERT
) ? !ret
: ret
;
275 int fib_rules_lookup(struct fib_rules_ops
*ops
, struct flowi
*fl
,
276 int flags
, struct fib_lookup_arg
*arg
)
278 struct fib_rule
*rule
;
283 list_for_each_entry_rcu(rule
, &ops
->rules_list
, list
) {
285 if (!fib_rule_match(rule
, ops
, fl
, flags
, arg
))
288 if (rule
->action
== FR_ACT_GOTO
) {
289 struct fib_rule
*target
;
291 target
= rcu_dereference(rule
->ctarget
);
292 if (target
== NULL
) {
298 } else if (rule
->action
== FR_ACT_NOP
)
301 err
= ops
->action(rule
, fl
, flags
, arg
);
303 if (!err
&& ops
->suppress
&& ops
->suppress(rule
, arg
))
306 if (err
!= -EAGAIN
) {
307 if ((arg
->flags
& FIB_LOOKUP_NOREF
) ||
308 likely(refcount_inc_not_zero(&rule
->refcnt
))) {
322 EXPORT_SYMBOL_GPL(fib_rules_lookup
);
324 static int call_fib_rule_notifier(struct notifier_block
*nb
,
325 enum fib_event_type event_type
,
326 struct fib_rule
*rule
, int family
,
327 struct netlink_ext_ack
*extack
)
329 struct fib_rule_notifier_info info
= {
330 .info
.family
= family
,
331 .info
.extack
= extack
,
335 return call_fib_notifier(nb
, event_type
, &info
.info
);
338 static int call_fib_rule_notifiers(struct net
*net
,
339 enum fib_event_type event_type
,
340 struct fib_rule
*rule
,
341 struct fib_rules_ops
*ops
,
342 struct netlink_ext_ack
*extack
)
344 struct fib_rule_notifier_info info
= {
345 .info
.family
= ops
->family
,
346 .info
.extack
= extack
,
350 ops
->fib_rules_seq
++;
351 return call_fib_notifiers(net
, event_type
, &info
.info
);
354 /* Called with rcu_read_lock() */
355 int fib_rules_dump(struct net
*net
, struct notifier_block
*nb
, int family
,
356 struct netlink_ext_ack
*extack
)
358 struct fib_rules_ops
*ops
;
359 struct fib_rule
*rule
;
362 ops
= lookup_rules_ops(net
, family
);
364 return -EAFNOSUPPORT
;
365 list_for_each_entry_rcu(rule
, &ops
->rules_list
, list
) {
366 err
= call_fib_rule_notifier(nb
, FIB_EVENT_RULE_ADD
,
367 rule
, family
, extack
);
375 EXPORT_SYMBOL_GPL(fib_rules_dump
);
377 unsigned int fib_rules_seq_read(struct net
*net
, int family
)
379 unsigned int fib_rules_seq
;
380 struct fib_rules_ops
*ops
;
384 ops
= lookup_rules_ops(net
, family
);
387 fib_rules_seq
= ops
->fib_rules_seq
;
390 return fib_rules_seq
;
392 EXPORT_SYMBOL_GPL(fib_rules_seq_read
);
394 static struct fib_rule
*rule_find(struct fib_rules_ops
*ops
,
395 struct fib_rule_hdr
*frh
,
397 struct fib_rule
*rule
,
402 list_for_each_entry(r
, &ops
->rules_list
, list
) {
403 if (rule
->action
&& r
->action
!= rule
->action
)
406 if (rule
->table
&& r
->table
!= rule
->table
)
409 if (user_priority
&& r
->pref
!= rule
->pref
)
412 if (rule
->iifname
[0] &&
413 memcmp(r
->iifname
, rule
->iifname
, IFNAMSIZ
))
416 if (rule
->oifname
[0] &&
417 memcmp(r
->oifname
, rule
->oifname
, IFNAMSIZ
))
420 if (rule
->mark
&& r
->mark
!= rule
->mark
)
423 if (rule
->suppress_ifgroup
!= -1 &&
424 r
->suppress_ifgroup
!= rule
->suppress_ifgroup
)
427 if (rule
->suppress_prefixlen
!= -1 &&
428 r
->suppress_prefixlen
!= rule
->suppress_prefixlen
)
431 if (rule
->mark_mask
&& r
->mark_mask
!= rule
->mark_mask
)
434 if (rule
->tun_id
&& r
->tun_id
!= rule
->tun_id
)
437 if (r
->fr_net
!= rule
->fr_net
)
440 if (rule
->l3mdev
&& r
->l3mdev
!= rule
->l3mdev
)
443 if (uid_range_set(&rule
->uid_range
) &&
444 (!uid_eq(r
->uid_range
.start
, rule
->uid_range
.start
) ||
445 !uid_eq(r
->uid_range
.end
, rule
->uid_range
.end
)))
448 if (rule
->ip_proto
&& r
->ip_proto
!= rule
->ip_proto
)
451 if (rule
->proto
&& r
->proto
!= rule
->proto
)
454 if (fib_rule_port_range_set(&rule
->sport_range
) &&
455 !fib_rule_port_range_compare(&r
->sport_range
,
459 if (fib_rule_port_range_set(&rule
->dport_range
) &&
460 !fib_rule_port_range_compare(&r
->dport_range
,
464 if (!ops
->compare(r
, frh
, tb
))
472 #ifdef CONFIG_NET_L3_MASTER_DEV
473 static int fib_nl2rule_l3mdev(struct nlattr
*nla
, struct fib_rule
*nlrule
,
474 struct netlink_ext_ack
*extack
)
476 nlrule
->l3mdev
= nla_get_u8(nla
);
477 if (nlrule
->l3mdev
!= 1) {
478 NL_SET_ERR_MSG(extack
, "Invalid l3mdev attribute");
485 static int fib_nl2rule_l3mdev(struct nlattr
*nla
, struct fib_rule
*nlrule
,
486 struct netlink_ext_ack
*extack
)
488 NL_SET_ERR_MSG(extack
, "l3mdev support is not enabled in kernel");
493 static int fib_nl2rule(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
494 struct netlink_ext_ack
*extack
,
495 struct fib_rules_ops
*ops
,
497 struct fib_rule
**rule
,
500 struct net
*net
= sock_net(skb
->sk
);
501 struct fib_rule_hdr
*frh
= nlmsg_data(nlh
);
502 struct fib_rule
*nlrule
= NULL
;
507 frh
->src_len
> (ops
->addr_size
* 8) ||
508 nla_len(tb
[FRA_SRC
]) != ops
->addr_size
) {
509 NL_SET_ERR_MSG(extack
, "Invalid source address");
515 frh
->dst_len
> (ops
->addr_size
* 8) ||
516 nla_len(tb
[FRA_DST
]) != ops
->addr_size
) {
517 NL_SET_ERR_MSG(extack
, "Invalid dst address");
521 nlrule
= kzalloc(ops
->rule_size
, GFP_KERNEL
);
526 refcount_set(&nlrule
->refcnt
, 1);
527 nlrule
->fr_net
= net
;
529 if (tb
[FRA_PRIORITY
]) {
530 nlrule
->pref
= nla_get_u32(tb
[FRA_PRIORITY
]);
531 *user_priority
= true;
533 nlrule
->pref
= fib_default_rule_pref(ops
);
536 nlrule
->proto
= tb
[FRA_PROTOCOL
] ?
537 nla_get_u8(tb
[FRA_PROTOCOL
]) : RTPROT_UNSPEC
;
539 if (tb
[FRA_IIFNAME
]) {
540 struct net_device
*dev
;
542 nlrule
->iifindex
= -1;
543 nla_strlcpy(nlrule
->iifname
, tb
[FRA_IIFNAME
], IFNAMSIZ
);
544 dev
= __dev_get_by_name(net
, nlrule
->iifname
);
546 nlrule
->iifindex
= dev
->ifindex
;
549 if (tb
[FRA_OIFNAME
]) {
550 struct net_device
*dev
;
552 nlrule
->oifindex
= -1;
553 nla_strlcpy(nlrule
->oifname
, tb
[FRA_OIFNAME
], IFNAMSIZ
);
554 dev
= __dev_get_by_name(net
, nlrule
->oifname
);
556 nlrule
->oifindex
= dev
->ifindex
;
559 if (tb
[FRA_FWMARK
]) {
560 nlrule
->mark
= nla_get_u32(tb
[FRA_FWMARK
]);
562 /* compatibility: if the mark value is non-zero all bits
563 * are compared unless a mask is explicitly specified.
565 nlrule
->mark_mask
= 0xFFFFFFFF;
569 nlrule
->mark_mask
= nla_get_u32(tb
[FRA_FWMASK
]);
572 nlrule
->tun_id
= nla_get_be64(tb
[FRA_TUN_ID
]);
575 if (tb
[FRA_L3MDEV
] &&
576 fib_nl2rule_l3mdev(tb
[FRA_L3MDEV
], nlrule
, extack
) < 0)
579 nlrule
->action
= frh
->action
;
580 nlrule
->flags
= frh
->flags
;
581 nlrule
->table
= frh_get_table(frh
, tb
);
582 if (tb
[FRA_SUPPRESS_PREFIXLEN
])
583 nlrule
->suppress_prefixlen
= nla_get_u32(tb
[FRA_SUPPRESS_PREFIXLEN
]);
585 nlrule
->suppress_prefixlen
= -1;
587 if (tb
[FRA_SUPPRESS_IFGROUP
])
588 nlrule
->suppress_ifgroup
= nla_get_u32(tb
[FRA_SUPPRESS_IFGROUP
]);
590 nlrule
->suppress_ifgroup
= -1;
593 if (nlrule
->action
!= FR_ACT_GOTO
) {
594 NL_SET_ERR_MSG(extack
, "Unexpected goto");
598 nlrule
->target
= nla_get_u32(tb
[FRA_GOTO
]);
599 /* Backward jumps are prohibited to avoid endless loops */
600 if (nlrule
->target
<= nlrule
->pref
) {
601 NL_SET_ERR_MSG(extack
, "Backward goto not supported");
604 } else if (nlrule
->action
== FR_ACT_GOTO
) {
605 NL_SET_ERR_MSG(extack
, "Missing goto target for action goto");
609 if (nlrule
->l3mdev
&& nlrule
->table
) {
610 NL_SET_ERR_MSG(extack
, "l3mdev and table are mutually exclusive");
614 if (tb
[FRA_UID_RANGE
]) {
615 if (current_user_ns() != net
->user_ns
) {
617 NL_SET_ERR_MSG(extack
, "No permission to set uid");
621 nlrule
->uid_range
= nla_get_kuid_range(tb
);
623 if (!uid_range_set(&nlrule
->uid_range
) ||
624 !uid_lte(nlrule
->uid_range
.start
, nlrule
->uid_range
.end
)) {
625 NL_SET_ERR_MSG(extack
, "Invalid uid range");
629 nlrule
->uid_range
= fib_kuid_range_unset
;
632 if (tb
[FRA_IP_PROTO
])
633 nlrule
->ip_proto
= nla_get_u8(tb
[FRA_IP_PROTO
]);
635 if (tb
[FRA_SPORT_RANGE
]) {
636 err
= nla_get_port_range(tb
[FRA_SPORT_RANGE
],
637 &nlrule
->sport_range
);
639 NL_SET_ERR_MSG(extack
, "Invalid sport range");
644 if (tb
[FRA_DPORT_RANGE
]) {
645 err
= nla_get_port_range(tb
[FRA_DPORT_RANGE
],
646 &nlrule
->dport_range
);
648 NL_SET_ERR_MSG(extack
, "Invalid dport range");
663 static int rule_exists(struct fib_rules_ops
*ops
, struct fib_rule_hdr
*frh
,
664 struct nlattr
**tb
, struct fib_rule
*rule
)
668 list_for_each_entry(r
, &ops
->rules_list
, list
) {
669 if (r
->action
!= rule
->action
)
672 if (r
->table
!= rule
->table
)
675 if (r
->pref
!= rule
->pref
)
678 if (memcmp(r
->iifname
, rule
->iifname
, IFNAMSIZ
))
681 if (memcmp(r
->oifname
, rule
->oifname
, IFNAMSIZ
))
684 if (r
->mark
!= rule
->mark
)
687 if (r
->suppress_ifgroup
!= rule
->suppress_ifgroup
)
690 if (r
->suppress_prefixlen
!= rule
->suppress_prefixlen
)
693 if (r
->mark_mask
!= rule
->mark_mask
)
696 if (r
->tun_id
!= rule
->tun_id
)
699 if (r
->fr_net
!= rule
->fr_net
)
702 if (r
->l3mdev
!= rule
->l3mdev
)
705 if (!uid_eq(r
->uid_range
.start
, rule
->uid_range
.start
) ||
706 !uid_eq(r
->uid_range
.end
, rule
->uid_range
.end
))
709 if (r
->ip_proto
!= rule
->ip_proto
)
712 if (r
->proto
!= rule
->proto
)
715 if (!fib_rule_port_range_compare(&r
->sport_range
,
719 if (!fib_rule_port_range_compare(&r
->dport_range
,
723 if (!ops
->compare(r
, frh
, tb
))
730 int fib_nl_newrule(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
731 struct netlink_ext_ack
*extack
)
733 struct net
*net
= sock_net(skb
->sk
);
734 struct fib_rule_hdr
*frh
= nlmsg_data(nlh
);
735 struct fib_rules_ops
*ops
= NULL
;
736 struct fib_rule
*rule
= NULL
, *r
, *last
= NULL
;
737 struct nlattr
*tb
[FRA_MAX
+ 1];
738 int err
= -EINVAL
, unresolved
= 0;
739 bool user_priority
= false;
741 if (nlh
->nlmsg_len
< nlmsg_msg_size(sizeof(*frh
))) {
742 NL_SET_ERR_MSG(extack
, "Invalid msg length");
746 ops
= lookup_rules_ops(net
, frh
->family
);
749 NL_SET_ERR_MSG(extack
, "Rule family not supported");
753 err
= nlmsg_parse_deprecated(nlh
, sizeof(*frh
), tb
, FRA_MAX
,
754 ops
->policy
, extack
);
756 NL_SET_ERR_MSG(extack
, "Error parsing msg");
760 err
= fib_nl2rule(skb
, nlh
, extack
, ops
, tb
, &rule
, &user_priority
);
764 if ((nlh
->nlmsg_flags
& NLM_F_EXCL
) &&
765 rule_exists(ops
, frh
, tb
, rule
)) {
770 err
= ops
->configure(rule
, skb
, frh
, tb
, extack
);
774 err
= call_fib_rule_notifiers(net
, FIB_EVENT_RULE_ADD
, rule
, ops
,
779 list_for_each_entry(r
, &ops
->rules_list
, list
) {
780 if (r
->pref
== rule
->target
) {
781 RCU_INIT_POINTER(rule
->ctarget
, r
);
786 if (rcu_dereference_protected(rule
->ctarget
, 1) == NULL
)
789 list_for_each_entry(r
, &ops
->rules_list
, list
) {
790 if (r
->pref
> rule
->pref
)
796 list_add_rcu(&rule
->list
, &last
->list
);
798 list_add_rcu(&rule
->list
, &ops
->rules_list
);
800 if (ops
->unresolved_rules
) {
802 * There are unresolved goto rules in the list, check if
803 * any of them are pointing to this new rule.
805 list_for_each_entry(r
, &ops
->rules_list
, list
) {
806 if (r
->action
== FR_ACT_GOTO
&&
807 r
->target
== rule
->pref
&&
808 rtnl_dereference(r
->ctarget
) == NULL
) {
809 rcu_assign_pointer(r
->ctarget
, rule
);
810 if (--ops
->unresolved_rules
== 0)
816 if (rule
->action
== FR_ACT_GOTO
)
817 ops
->nr_goto_rules
++;
820 ops
->unresolved_rules
++;
823 ip_tunnel_need_metadata();
825 notify_rule_change(RTM_NEWRULE
, rule
, ops
, nlh
, NETLINK_CB(skb
).portid
);
826 flush_route_cache(ops
);
836 EXPORT_SYMBOL_GPL(fib_nl_newrule
);
838 int fib_nl_delrule(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
839 struct netlink_ext_ack
*extack
)
841 struct net
*net
= sock_net(skb
->sk
);
842 struct fib_rule_hdr
*frh
= nlmsg_data(nlh
);
843 struct fib_rules_ops
*ops
= NULL
;
844 struct fib_rule
*rule
= NULL
, *r
, *nlrule
= NULL
;
845 struct nlattr
*tb
[FRA_MAX
+1];
847 bool user_priority
= false;
849 if (nlh
->nlmsg_len
< nlmsg_msg_size(sizeof(*frh
))) {
850 NL_SET_ERR_MSG(extack
, "Invalid msg length");
854 ops
= lookup_rules_ops(net
, frh
->family
);
857 NL_SET_ERR_MSG(extack
, "Rule family not supported");
861 err
= nlmsg_parse_deprecated(nlh
, sizeof(*frh
), tb
, FRA_MAX
,
862 ops
->policy
, extack
);
864 NL_SET_ERR_MSG(extack
, "Error parsing msg");
868 err
= fib_nl2rule(skb
, nlh
, extack
, ops
, tb
, &nlrule
, &user_priority
);
872 rule
= rule_find(ops
, frh
, tb
, nlrule
, user_priority
);
878 if (rule
->flags
& FIB_RULE_PERMANENT
) {
884 err
= ops
->delete(rule
);
890 ip_tunnel_unneed_metadata();
892 list_del_rcu(&rule
->list
);
894 if (rule
->action
== FR_ACT_GOTO
) {
895 ops
->nr_goto_rules
--;
896 if (rtnl_dereference(rule
->ctarget
) == NULL
)
897 ops
->unresolved_rules
--;
901 * Check if this rule is a target to any of them. If so,
902 * adjust to the next one with the same preference or
903 * disable them. As this operation is eventually very
904 * expensive, it is only performed if goto rules, except
905 * current if it is goto rule, have actually been added.
907 if (ops
->nr_goto_rules
> 0) {
910 n
= list_next_entry(rule
, list
);
911 if (&n
->list
== &ops
->rules_list
|| n
->pref
!= rule
->pref
)
913 list_for_each_entry(r
, &ops
->rules_list
, list
) {
914 if (rtnl_dereference(r
->ctarget
) != rule
)
916 rcu_assign_pointer(r
->ctarget
, n
);
918 ops
->unresolved_rules
++;
922 call_fib_rule_notifiers(net
, FIB_EVENT_RULE_DEL
, rule
, ops
,
924 notify_rule_change(RTM_DELRULE
, rule
, ops
, nlh
,
925 NETLINK_CB(skb
).portid
);
927 flush_route_cache(ops
);
937 EXPORT_SYMBOL_GPL(fib_nl_delrule
);
939 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops
*ops
,
940 struct fib_rule
*rule
)
942 size_t payload
= NLMSG_ALIGN(sizeof(struct fib_rule_hdr
))
943 + nla_total_size(IFNAMSIZ
) /* FRA_IIFNAME */
944 + nla_total_size(IFNAMSIZ
) /* FRA_OIFNAME */
945 + nla_total_size(4) /* FRA_PRIORITY */
946 + nla_total_size(4) /* FRA_TABLE */
947 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
948 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
949 + nla_total_size(4) /* FRA_FWMARK */
950 + nla_total_size(4) /* FRA_FWMASK */
951 + nla_total_size_64bit(8) /* FRA_TUN_ID */
952 + nla_total_size(sizeof(struct fib_kuid_range
))
953 + nla_total_size(1) /* FRA_PROTOCOL */
954 + nla_total_size(1) /* FRA_IP_PROTO */
955 + nla_total_size(sizeof(struct fib_rule_port_range
)) /* FRA_SPORT_RANGE */
956 + nla_total_size(sizeof(struct fib_rule_port_range
)); /* FRA_DPORT_RANGE */
958 if (ops
->nlmsg_payload
)
959 payload
+= ops
->nlmsg_payload(rule
);
964 static int fib_nl_fill_rule(struct sk_buff
*skb
, struct fib_rule
*rule
,
965 u32 pid
, u32 seq
, int type
, int flags
,
966 struct fib_rules_ops
*ops
)
968 struct nlmsghdr
*nlh
;
969 struct fib_rule_hdr
*frh
;
971 nlh
= nlmsg_put(skb
, pid
, seq
, type
, sizeof(*frh
), flags
);
975 frh
= nlmsg_data(nlh
);
976 frh
->family
= ops
->family
;
977 frh
->table
= rule
->table
;
978 if (nla_put_u32(skb
, FRA_TABLE
, rule
->table
))
979 goto nla_put_failure
;
980 if (nla_put_u32(skb
, FRA_SUPPRESS_PREFIXLEN
, rule
->suppress_prefixlen
))
981 goto nla_put_failure
;
984 frh
->action
= rule
->action
;
985 frh
->flags
= rule
->flags
;
987 if (nla_put_u8(skb
, FRA_PROTOCOL
, rule
->proto
))
988 goto nla_put_failure
;
990 if (rule
->action
== FR_ACT_GOTO
&&
991 rcu_access_pointer(rule
->ctarget
) == NULL
)
992 frh
->flags
|= FIB_RULE_UNRESOLVED
;
994 if (rule
->iifname
[0]) {
995 if (nla_put_string(skb
, FRA_IIFNAME
, rule
->iifname
))
996 goto nla_put_failure
;
997 if (rule
->iifindex
== -1)
998 frh
->flags
|= FIB_RULE_IIF_DETACHED
;
1001 if (rule
->oifname
[0]) {
1002 if (nla_put_string(skb
, FRA_OIFNAME
, rule
->oifname
))
1003 goto nla_put_failure
;
1004 if (rule
->oifindex
== -1)
1005 frh
->flags
|= FIB_RULE_OIF_DETACHED
;
1009 nla_put_u32(skb
, FRA_PRIORITY
, rule
->pref
)) ||
1011 nla_put_u32(skb
, FRA_FWMARK
, rule
->mark
)) ||
1012 ((rule
->mark_mask
|| rule
->mark
) &&
1013 nla_put_u32(skb
, FRA_FWMASK
, rule
->mark_mask
)) ||
1015 nla_put_u32(skb
, FRA_GOTO
, rule
->target
)) ||
1017 nla_put_be64(skb
, FRA_TUN_ID
, rule
->tun_id
, FRA_PAD
)) ||
1019 nla_put_u8(skb
, FRA_L3MDEV
, rule
->l3mdev
)) ||
1020 (uid_range_set(&rule
->uid_range
) &&
1021 nla_put_uid_range(skb
, &rule
->uid_range
)) ||
1022 (fib_rule_port_range_set(&rule
->sport_range
) &&
1023 nla_put_port_range(skb
, FRA_SPORT_RANGE
, &rule
->sport_range
)) ||
1024 (fib_rule_port_range_set(&rule
->dport_range
) &&
1025 nla_put_port_range(skb
, FRA_DPORT_RANGE
, &rule
->dport_range
)) ||
1026 (rule
->ip_proto
&& nla_put_u8(skb
, FRA_IP_PROTO
, rule
->ip_proto
)))
1027 goto nla_put_failure
;
1029 if (rule
->suppress_ifgroup
!= -1) {
1030 if (nla_put_u32(skb
, FRA_SUPPRESS_IFGROUP
, rule
->suppress_ifgroup
))
1031 goto nla_put_failure
;
1034 if (ops
->fill(rule
, skb
, frh
) < 0)
1035 goto nla_put_failure
;
1037 nlmsg_end(skb
, nlh
);
1041 nlmsg_cancel(skb
, nlh
);
1045 static int dump_rules(struct sk_buff
*skb
, struct netlink_callback
*cb
,
1046 struct fib_rules_ops
*ops
)
1049 struct fib_rule
*rule
;
1053 list_for_each_entry_rcu(rule
, &ops
->rules_list
, list
) {
1054 if (idx
< cb
->args
[1])
1057 err
= fib_nl_fill_rule(skb
, rule
, NETLINK_CB(cb
->skb
).portid
,
1058 cb
->nlh
->nlmsg_seq
, RTM_NEWRULE
,
1072 static int fib_valid_dumprule_req(const struct nlmsghdr
*nlh
,
1073 struct netlink_ext_ack
*extack
)
1075 struct fib_rule_hdr
*frh
;
1077 if (nlh
->nlmsg_len
< nlmsg_msg_size(sizeof(*frh
))) {
1078 NL_SET_ERR_MSG(extack
, "Invalid header for fib rule dump request");
1082 frh
= nlmsg_data(nlh
);
1083 if (frh
->dst_len
|| frh
->src_len
|| frh
->tos
|| frh
->table
||
1084 frh
->res1
|| frh
->res2
|| frh
->action
|| frh
->flags
) {
1085 NL_SET_ERR_MSG(extack
,
1086 "Invalid values in header for fib rule dump request");
1090 if (nlmsg_attrlen(nlh
, sizeof(*frh
))) {
1091 NL_SET_ERR_MSG(extack
, "Invalid data after header in fib rule dump request");
1098 static int fib_nl_dumprule(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1100 const struct nlmsghdr
*nlh
= cb
->nlh
;
1101 struct net
*net
= sock_net(skb
->sk
);
1102 struct fib_rules_ops
*ops
;
1103 int idx
= 0, family
;
1105 if (cb
->strict_check
) {
1106 int err
= fib_valid_dumprule_req(nlh
, cb
->extack
);
1112 family
= rtnl_msg_family(nlh
);
1113 if (family
!= AF_UNSPEC
) {
1114 /* Protocol specific dump request */
1115 ops
= lookup_rules_ops(net
, family
);
1117 return -EAFNOSUPPORT
;
1119 dump_rules(skb
, cb
, ops
);
1125 list_for_each_entry_rcu(ops
, &net
->rules_ops
, list
) {
1126 if (idx
< cb
->args
[0] || !try_module_get(ops
->owner
))
1129 if (dump_rules(skb
, cb
, ops
) < 0)
1142 static void notify_rule_change(int event
, struct fib_rule
*rule
,
1143 struct fib_rules_ops
*ops
, struct nlmsghdr
*nlh
,
1147 struct sk_buff
*skb
;
1151 skb
= nlmsg_new(fib_rule_nlmsg_size(ops
, rule
), GFP_KERNEL
);
1155 err
= fib_nl_fill_rule(skb
, rule
, pid
, nlh
->nlmsg_seq
, event
, 0, ops
);
1157 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1158 WARN_ON(err
== -EMSGSIZE
);
1163 rtnl_notify(skb
, net
, pid
, ops
->nlgroup
, nlh
, GFP_KERNEL
);
1167 rtnl_set_sk_err(net
, ops
->nlgroup
, err
);
1170 static void attach_rules(struct list_head
*rules
, struct net_device
*dev
)
1172 struct fib_rule
*rule
;
1174 list_for_each_entry(rule
, rules
, list
) {
1175 if (rule
->iifindex
== -1 &&
1176 strcmp(dev
->name
, rule
->iifname
) == 0)
1177 rule
->iifindex
= dev
->ifindex
;
1178 if (rule
->oifindex
== -1 &&
1179 strcmp(dev
->name
, rule
->oifname
) == 0)
1180 rule
->oifindex
= dev
->ifindex
;
1184 static void detach_rules(struct list_head
*rules
, struct net_device
*dev
)
1186 struct fib_rule
*rule
;
1188 list_for_each_entry(rule
, rules
, list
) {
1189 if (rule
->iifindex
== dev
->ifindex
)
1190 rule
->iifindex
= -1;
1191 if (rule
->oifindex
== dev
->ifindex
)
1192 rule
->oifindex
= -1;
1197 static int fib_rules_event(struct notifier_block
*this, unsigned long event
,
1200 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1201 struct net
*net
= dev_net(dev
);
1202 struct fib_rules_ops
*ops
;
1207 case NETDEV_REGISTER
:
1208 list_for_each_entry(ops
, &net
->rules_ops
, list
)
1209 attach_rules(&ops
->rules_list
, dev
);
1212 case NETDEV_CHANGENAME
:
1213 list_for_each_entry(ops
, &net
->rules_ops
, list
) {
1214 detach_rules(&ops
->rules_list
, dev
);
1215 attach_rules(&ops
->rules_list
, dev
);
1219 case NETDEV_UNREGISTER
:
1220 list_for_each_entry(ops
, &net
->rules_ops
, list
)
1221 detach_rules(&ops
->rules_list
, dev
);
1228 static struct notifier_block fib_rules_notifier
= {
1229 .notifier_call
= fib_rules_event
,
1232 static int __net_init
fib_rules_net_init(struct net
*net
)
1234 INIT_LIST_HEAD(&net
->rules_ops
);
1235 spin_lock_init(&net
->rules_mod_lock
);
1239 static void __net_exit
fib_rules_net_exit(struct net
*net
)
1241 WARN_ON_ONCE(!list_empty(&net
->rules_ops
));
1244 static struct pernet_operations fib_rules_net_ops
= {
1245 .init
= fib_rules_net_init
,
1246 .exit
= fib_rules_net_exit
,
1249 static int __init
fib_rules_init(void)
1252 rtnl_register(PF_UNSPEC
, RTM_NEWRULE
, fib_nl_newrule
, NULL
, 0);
1253 rtnl_register(PF_UNSPEC
, RTM_DELRULE
, fib_nl_delrule
, NULL
, 0);
1254 rtnl_register(PF_UNSPEC
, RTM_GETRULE
, NULL
, fib_nl_dumprule
, 0);
1256 err
= register_pernet_subsys(&fib_rules_net_ops
);
1260 err
= register_netdevice_notifier(&fib_rules_notifier
);
1262 goto fail_unregister
;
1267 unregister_pernet_subsys(&fib_rules_net_ops
);
1269 rtnl_unregister(PF_UNSPEC
, RTM_NEWRULE
);
1270 rtnl_unregister(PF_UNSPEC
, RTM_DELRULE
);
1271 rtnl_unregister(PF_UNSPEC
, RTM_GETRULE
);
1275 subsys_initcall(fib_rules_init
);