Commit 71b1391a authored Nov 25, 2011 by Florian Westphal Committed by David S. Miller Nov 26, 2011

l2tp: ensure sk->dst is still valid



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check callback finds that the bundle is no longer valid).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>

parent 8a6e77d5

net/l2tp/l2tp_core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;