diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 777339b..3c7dbc6 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -193,6 +193,11 @@
 
 #define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
 
+static inline int inet6_iif(const struct sk_buff *skb)
+{
+	return IP6CB(skb)->iif;
+}
+
 struct tcp6_request_sock {
 	struct tcp_request_sock	req;
 	struct in6_addr		loc_addr;