net: Move mtu handling down to the protocol depended handlers
We move all mtu handling from dst_mtu() down to the protocol
layer. So each protocol can implement the mtu handling in
a different manner.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index b8be51e..2118d64 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2384,7 +2384,9 @@
static unsigned int xfrm_mtu(const struct dst_entry *dst)
{
- return dst_mtu(dst->path);
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst_mtu(dst->path);
}
static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, const void *daddr)