Index: sys/net/route.c
===================================================================
--- sys/net/route.c
+++ sys/net/route.c
@@ -270,7 +270,7 @@
 			rnh = rt_tables_get_rnh_ptr(table, fam);
 			if (rnh == NULL)
 				panic("%s: rnh NULL", __func__);
-			dom->dom_rtattach((void **)rnh, 0, table);
+			*rnh = dom->dom_rtattach(table);
 		}
 	}
 }
@@ -299,7 +299,7 @@
 			rnh = rt_tables_get_rnh_ptr(table, fam);
 			if (rnh == NULL)
 				panic("%s: rnh NULL", __func__);
-			dom->dom_rtdetach((void **)rnh, 0);
+			dom->dom_rtdetach(*rnh);
 		}
 	}
 
Index: sys/netinet/in_proto.c
===================================================================
--- sys/netinet/in_proto.c
+++ sys/netinet/in_proto.c
@@ -294,9 +294,6 @@
 },
 };
 
-extern int in_inithead(void **, int, u_int);
-extern int in_detachhead(void **, int);
-
 struct domain inetdomain = {
 	.dom_family =		AF_INET,
 	.dom_name =		"internet",
Index: sys/netinet/in_rmx.c
===================================================================
--- sys/netinet/in_rmx.c
+++ sys/netinet/in_rmx.c
@@ -54,10 +54,6 @@
 #include <netinet/ip_icmp.h>
 #include <netinet/ip_var.h>
 
-extern int	in_inithead(void **head, int off, u_int fibnum);
-#ifdef VIMAGE
-extern int	in_detachhead(void **head, int off);
-#endif
 
 static int
 rib4_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
@@ -121,38 +117,32 @@
 	return (0);
 }
 
-static int _in_rt_was_here;
 /*
  * Initialize our routing tree.
  */
-int
-in_inithead(void **head, int off, u_int fibnum)
+struct rib_head *
+in_inithead(uint32_t fibnum)
 {
 	struct rib_head *rh;
 
 	rh = rt_table_init(32, AF_INET, fibnum);
 	if (rh == NULL)
-		return (0);
+		return (NULL);
 
 	rh->rnh_preadd = rib4_preadd;
 #ifdef	RADIX_MPATH
 	rt_mpath_init_rnh(rh);
 #endif
-	*head = (void *)rh;
 
-	if (_in_rt_was_here == 0 ) {
-		_in_rt_was_here = 1;
-	}
-	return 1;
+	return (rh);
 }
 
 #ifdef VIMAGE
-int
-in_detachhead(void **head, int off)
+void
+in_detachhead(struct rib_head *rh)
 {
 
-	rt_table_destroy((struct rib_head *)(*head));
-	return (1);
+	rt_table_destroy(rh);
 }
 #endif
 
Index: sys/netinet/in_var.h
===================================================================
--- sys/netinet/in_var.h
+++ sys/netinet/in_var.h
@@ -436,8 +436,7 @@
 #define MCAST_NOTSMEMBER	2	/* This host excluded source */
 #define MCAST_MUTED		3	/* [deprecated] */
 
-struct	rtentry;
-struct	route;
+struct rib_head;
 struct	ip_moptions;
 
 struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr);
@@ -470,6 +469,10 @@
 struct	mbuf	*ip_tryforward(struct mbuf *);
 void	*in_domifattach(struct ifnet *);
 void	in_domifdetach(struct ifnet *, void *);
+struct rib_head *in_inithead(uint32_t fibnum);
+#ifdef VIMAGE
+void	in_detachhead(struct rib_head *rh);
+#endif
 
 #endif /* _KERNEL */
 
Index: sys/netinet6/in6_proto.c
===================================================================
--- sys/netinet6/in6_proto.c
+++ sys/netinet6/in6_proto.c
@@ -333,11 +333,6 @@
 },
 };
 
-extern int in6_inithead(void **, int, u_int);
-#ifdef VIMAGE
-extern int in6_detachhead(void **, int);
-#endif
-
 struct domain inet6domain = {
 	.dom_family =		AF_INET6,
 	.dom_name =		"internet6",
Index: sys/netinet6/in6_rmx.c
===================================================================
--- sys/netinet6/in6_rmx.c
+++ sys/netinet6/in6_rmx.c
@@ -101,11 +101,6 @@
 #include <netinet/tcp_timer.h>
 #include <netinet/tcp_var.h>
 
-extern int	in6_inithead(void **head, int off, u_int fibnum);
-#ifdef VIMAGE
-extern int	in6_detachhead(void **head, int off);
-#endif
-
 static int
 rib6_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
     struct nhop_object *nh)
@@ -147,8 +142,8 @@
  * Initialize our routing tree.
  */
 
-int
-in6_inithead(void **head, int off, u_int fibnum)
+struct rib_head *
+in6_inithead(uint32_t fibnum)
 {
 	struct epoch_tracker et;
 	struct rib_head *rh;
@@ -156,13 +151,12 @@
 	rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3,
 	    AF_INET6, fibnum);
 	if (rh == NULL)
-		return (0);
+		return (NULL);
 
 	rh->rnh_preadd = rib6_preadd;
 #ifdef	RADIX_MPATH
 	rt_mpath_init_rnh(rh);
 #endif
-	*head = (void *)rh;
 
 	NET_EPOCH_ENTER(et);
 	if (rib_subscribe(fibnum, AF_INET6, nd6_subscription_cb, NULL,
@@ -171,17 +165,15 @@
 		    fibnum);
 	NET_EPOCH_EXIT(et);
 
-	return (1);
+	return (rh);
 }
 
 #ifdef VIMAGE
-int
-in6_detachhead(void **head, int off)
+void
+in6_detachhead(struct rib_head *rh)
 {
 
-	rt_table_destroy((struct rib_head *)(*head));
-
-	return (1);
+	rt_table_destroy(rh);
 }
 #endif
 
Index: sys/netinet6/in6_var.h
===================================================================
--- sys/netinet6/in6_var.h
+++ sys/netinet6/in6_var.h
@@ -857,6 +857,7 @@
 struct ip6_moptions;
 struct sockopt;
 struct inpcbinfo;
+struct rib_head;
 
 /* Multicast KPIs. */
 int	im6o_mc_filter(const struct ip6_moptions *, const struct ifnet *,
@@ -891,6 +892,8 @@
 void	*in6_domifattach(struct ifnet *);
 void	in6_domifdetach(struct ifnet *, void *);
 int	in6_domifmtu(struct ifnet *);
+struct rib_head *in6_inithead(uint32_t fibnum);
+void	in6_detachhead(struct rib_head *rh);
 void	in6_setmaxmtu(void);
 int	in6_if2idlen(struct ifnet *);
 struct in6_ifaddr *in6ifa_ifpforlinklocal(struct ifnet *, int);
Index: sys/sys/domain.h
===================================================================
--- sys/sys/domain.h
+++ sys/sys/domain.h
@@ -45,6 +45,7 @@
 struct	mbuf;
 struct	ifnet;
 struct	socket;
+struct	rib_head;
 
 struct domain {
 	int	dom_family;		/* AF_xxx */
@@ -59,10 +60,10 @@
 		(struct socket *);
 	struct	protosw *dom_protosw, *dom_protoswNPROTOSW;
 	struct	domain *dom_next;
-	int	(*dom_rtattach)		/* initialize routing table */
-		(void **, int, u_int);
-	int	(*dom_rtdetach)		/* clean up routing table */
-		(void **, int);
+	struct rib_head *(*dom_rtattach)	/* initialize routing table */
+		(uint32_t);
+	void	(*dom_rtdetach)		/* clean up routing table */
+		(struct rib_head *);
 	void	*(*dom_ifattach)(struct ifnet *);
 	void	(*dom_ifdetach)(struct ifnet *, void *);
 	int	(*dom_ifmtu)(struct ifnet *);