diff --git a/sys/netinet6/in6_var.h b/sys/netinet6/in6_var.h
index f2898e173897..f26939cdd186 100644
--- a/sys/netinet6/in6_var.h
+++ b/sys/netinet6/in6_var.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: in6_var.h,v 1.27 2002/05/29 07:53:41 itojun Exp $	*/
+/*	$NetBSD: in6_var.h,v 1.28 2002/06/07 14:35:55 itojun Exp $	*/
 /*	$KAME: in6_var.h,v 1.53 2001/02/10 02:44:27 itojun Exp $	*/
 
 /*
@@ -563,13 +563,13 @@ struct	in6_multi *in6_addmulti __P((struct in6_addr *, struct ifnet *,
 void	in6_delmulti __P((struct in6_multi *));
 struct in6_multi_mship *in6_joingroup __P((struct ifnet *, struct in6_addr *,
 	int *));
-int in6_leavegroup __P((struct in6_multi_mship *));
+int	in6_leavegroup __P((struct in6_multi_mship *));
 void	in6_ifscrub __P((struct ifnet *, struct in6_ifaddr *));
-extern int in6_ifindex2scopeid __P((int));
-extern int in6_mask2len __P((struct in6_addr *));
-extern void in6_len2mask __P((struct in6_addr *, int));
-int	in6_control __P((struct socket *,
-			 u_long, caddr_t, struct ifnet *, struct proc *));
+int	in6_ifindex2scopeid __P((int));
+int	in6_mask2len __P((struct in6_addr *, u_char *));
+void	in6_len2mask __P((struct in6_addr *, int));
+int	in6_control __P((struct socket *, u_long, caddr_t, struct ifnet *,
+	struct proc *));
 void	in6_purgeaddr __P((struct ifaddr *, struct ifnet *));
 int	in6if_do_dad __P((struct ifnet *));
 void	in6_purgeif __P((struct ifnet *));
@@ -581,18 +581,14 @@ void	in6_restoremkludge __P((struct in6_ifaddr *, struct ifnet *));
 void	in6_createmkludge __P((struct ifnet *));
 void	in6_purgemkludge __P((struct ifnet *));
 struct in6_ifaddr *in6ifa_ifpforlinklocal __P((struct ifnet *, int));
-struct in6_ifaddr *in6ifa_ifpwithaddr __P((struct ifnet *,
-					     struct in6_addr *));
+struct in6_ifaddr *in6ifa_ifpwithaddr __P((struct ifnet *, struct in6_addr *));
 char	*ip6_sprintf __P((const struct in6_addr *));
 int	in6_addr2scopeid __P((struct ifnet *, struct in6_addr *));
 int	in6_matchlen __P((struct in6_addr *, struct in6_addr *));
-int	in6_are_prefix_equal __P((struct in6_addr *p1, struct in6_addr *p2,
-				  int len));
-void	in6_prefixlen2mask __P((struct in6_addr *maskp, int len));
-int	in6_prefix_ioctl __P((struct socket *so, u_long cmd, caddr_t data,
-			      struct ifnet *ifp));
-int	in6_prefix_add_ifid __P((int iilen, struct in6_ifaddr *ia));
-void	in6_prefix_remove_ifid __P((int iilen, struct in6_ifaddr *ia));
+int	in6_are_prefix_equal __P((struct in6_addr *, struct in6_addr *, int));
+void	in6_prefixlen2mask __P((struct in6_addr *, int));
+int	in6_prefix_add_ifid __P((int, struct in6_ifaddr *));
+void	in6_prefix_remove_ifid __P((int, struct in6_ifaddr *));
 void	in6_purgeprefix __P((struct ifnet *));
 
 struct in6pcb;