1 files changed, 6 insertions, 4 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 552df27dcf5..2118d644663 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2382,9 +2382,11 @@ static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
         return dst_metric_advmss(dst->path);
 }
 
-static unsigned int xfrm_default_mtu(const struct dst_entry *dst)
+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)
@@ -2411,8 +2413,8 @@ int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
                         dst_ops->check = xfrm_dst_check;
                 if (likely(dst_ops->default_advmss == NULL))
                         dst_ops->default_advmss = xfrm_default_advmss;
-                if (likely(dst_ops->default_mtu == NULL))
-                        dst_ops->default_mtu = xfrm_default_mtu;
+                if (likely(dst_ops->mtu == NULL))
+                        dst_ops->mtu = xfrm_mtu;
                 if (likely(dst_ops->negative_advice == NULL))
                         dst_ops->negative_advice = xfrm_negative_advice;
                 if (likely(dst_ops->link_failure == NULL))