diff --git a/include/net/dst.h b/include/net/dst.h
index 0f303cc602520..08647c99d79c9 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -440,6 +440,15 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout)
 		dst->expires = expires;
 }
 
+static inline unsigned int dst_dev_overhead(struct dst_entry *dst,
+					    struct sk_buff *skb)
+{
+	if (likely(dst))
+		return LL_RESERVED_SPACE(dst->dev);
+
+	return skb->mac_len;
+}
+
 INDIRECT_CALLABLE_DECLARE(int ip6_output(struct net *, struct sock *,
 					 struct sk_buff *));
 INDIRECT_CALLABLE_DECLARE(int ip_output(struct net *, struct sock *,