[XFRM]: Fix MTU calculation for non-ESP SAs

[Patrick McHardy <kaber@trash.net>]

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[XFRM]: Fix MTU calculation for non-ESP SAs

My IPsec MTU optimization patch introduced a regression in MTU calculation
for non-ESP SAs, the SA's header_len needs to be subtracted from the MTU if
the transform doesn't provide a ->get_mtu() function.

Reported-and-tested-by: Marco Berizzi <pupilla@hotmail.com>

Signed-off-by: Patrick McHardy <kaber@trash.net>

---
commit b31d763b8a6b9a6eba5b5805f81ae605ebeab475
tree 6beec3612b419286bf9d7c7b98551ee30172da01
parent 188e1f81ba31af1b65a2f3611df4c670b092bbac
author Patrick McHardy <kaber@trash.net> Mon, 18 Jun 2007 17:57:09 +0200
committer Patrick McHardy <kaber@trash.net> Mon, 18 Jun 2007 17:57:09 +0200

 net/xfrm/xfrm_state.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 85f3f43..dfacb9c 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1729,7 +1729,7 @@ int xfrm_state_mtu(struct xfrm_state *x, int mtu)
 	    x->type && x->type->get_mtu)
 		res = x->type->get_mtu(x, mtu);
 	else
-		res = mtu;
+		res = mtu - x->props.header_len;
 	spin_unlock_bh(&x->lock);
 	return res;
 }