Merge branch 'x86-fb-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / include / net / route.h

diff --git a/include/net/route.h b/include/net/route.h
index 2ea40c1b5e009746dacb8f146fdcc37309aa7ff3..afdeeb5bec251ac773f03d8c7f0b830c9fa137e2 100644 (file)
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -317,4 +317,12 @@ static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
        return hoplimit;
 }
 
+static inline int ip_skb_dst_mtu(struct sk_buff *skb)
+{
+       struct inet_sock *inet = skb->sk ? inet_sk(skb->sk) : NULL;
+
+       return (inet && inet->pmtudisc == IP_PMTUDISC_PROBE) ?
+              skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
+}
+
 #endif /* _ROUTE_H */