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xfrm: force a garbage collection after deleting a policy

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In some cases after deleting a policy from the SPD the policy would
remain in the dst/flow/route cache for an extended period of time
which caused problems for SELinux as its dynamic network access
controls key off of the number of XFRM policy and state entries.
This patch corrects this problem by forcing a XFRM garbage collection
whenever a policy is sucessfully removed.

Reported-by: Ondrej Moris <omoris@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore 2013-05-29 07:36:25 +00:00 committed by David S. Miller
parent 1e2bd517c1
commit e4c1721642
4 changed files with 13 additions and 1 deletions
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5
include/net/xfrm.h
View file

@ -1160,6 +1160,8 @@ static inline void xfrm_sk_free_policy(struct sock *sk)
}
}
extern void xfrm_garbage_collect(struct net *net);
#else
static inline void xfrm_sk_free_policy(struct sock *sk) {}
@ -1194,6 +1196,9 @@ static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
{
return 1;
}
static inline void xfrm_garbage_collect(struct net *net)
{
}
#endif
static __inline__

4
net/key/af_key.c
View file

@ -2366,6 +2366,8 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sa
out:
xfrm_pol_put(xp);
if (err == 0)
xfrm_garbage_collect(net);
return err;
}
@ -2615,6 +2617,8 @@ static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_
out:
xfrm_pol_put(xp);
if (delete && err == 0)
xfrm_garbage_collect(net);
return err;
}

3
net/xfrm/xfrm_policy.c
View file

@ -2557,11 +2557,12 @@ static void __xfrm_garbage_collect(struct net *net)
}
}
static void xfrm_garbage_collect(struct net *net)
void xfrm_garbage_collect(struct net *net)
{
flow_cache_flush();
__xfrm_garbage_collect(net);
}
EXPORT_SYMBOL(xfrm_garbage_collect);
static void xfrm_garbage_collect_deferred(struct net *net)
{

2
net/xfrm/xfrm_user.c
View file

@ -1681,6 +1681,8 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
out:
xfrm_pol_put(xp);
if (delete && err == 0)
xfrm_garbage_collect(net);
return err;
}