diff --git a/sys/netinet6/in6.c b/sys/netinet6/in6.c
index 39e77e999b8f..9bf7a8f44e5d 100644
--- a/sys/netinet6/in6.c
+++ b/sys/netinet6/in6.c
@@ -2017,6 +2017,27 @@ in6_localaddr(struct in6_addr *in6)
 	return (0);
 }
 
+/*
+ * Return 1 if an internet address is for the local host and configured
+ * on one of its interfaces.
+ */
+int
+in6_localip(struct in6_addr *in6)
+{
+	struct in6_ifaddr *ia;
+
+	IN6_IFADDR_RLOCK();
+	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
+		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
+			IN6_IFADDR_RUNLOCK();
+			return (1);
+		}
+	}
+	IN6_IFADDR_RUNLOCK();
+	return (0);
+}
+
+
 int
 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 {
diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
index ae0da6aa0fff..5b552c9158d9 100644
--- a/sys/netinet6/in6.h
+++ b/sys/netinet6/in6.h
@@ -631,6 +631,7 @@ struct cmsghdr;
 
 int	in6_cksum __P((struct mbuf *, u_int8_t, u_int32_t, u_int32_t));
 int	in6_localaddr __P((struct in6_addr *));
+int	in6_localip(struct in6_addr *);
 int	in6_addrscope __P((struct in6_addr *));
 struct	in6_ifaddr *in6_ifawithifp __P((struct ifnet *, struct in6_addr *));
 extern void in6_if_up __P((struct ifnet *));