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l2tp: ensure sk->dst is still valid

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When using l2tp over ipsec, the tunnel will hang when rekeying
occurs. Reason is that the transformer bundle attached to the dst entry
is now in STATE_DEAD and thus xfrm_output_one() drops all packets
(XfrmOutStateExpired increases).

Fix this by calling __sk_dst_check (which drops the stale dst
if xfrm dst->check callback finds that the bundle is no longer valid).

Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2011-11-25 06:47:16 +00:00 committed by David S. Miller
parent 8a6e77d520
commit 71b1391a41
1 changed files with 1 additions and 1 deletions
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2
net/l2tp/l2tp_core.c
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@ -1072,7 +1072,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
/* Get routing info from the tunnel socket */
skb_dst_drop(skb);
skb_dst_set(skb, dst_clone(__sk_dst_get(sk)));
skb_dst_set(skb, dst_clone(__sk_dst_check(sk, 0)));
inet = inet_sk(sk);
fl = &inet->cork.fl;