diff --git a/sys/net/if.c b/sys/net/if.c
index e6b224f36422..ca592d29dad8 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if.c,v 1.148 2004/12/04 16:10:25 peter Exp $	*/
+/*	$NetBSD: if.c,v 1.149 2004/12/04 18:31:43 peter Exp $	*/
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -97,7 +97,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.148 2004/12/04 16:10:25 peter Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.149 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 
@@ -807,8 +807,7 @@ if_clone_destroy(name)
 	if (ifc->ifc_destroy == NULL)
 		return (EOPNOTSUPP);
 
-	(*ifc->ifc_destroy)(ifp);
-	return (0);
+	return ((*ifc->ifc_destroy)(ifp));
 }
 
 /*
diff --git a/sys/net/if.h b/sys/net/if.h
index 01f7bb78808e..c553c237fea8 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: if.h,v 1.97 2004/12/04 16:10:25 peter Exp $	*/
+/*	$NetBSD: if.h,v 1.98 2004/12/04 18:31:43 peter Exp $	*/
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -143,7 +143,7 @@ struct if_clone {
 	size_t ifc_namelen;		/* length of name */
 
 	int	(*ifc_create)(struct if_clone *, int);
-	void	(*ifc_destroy)(struct ifnet *);
+	int	(*ifc_destroy)(struct ifnet *);
 };
 
 #define	IF_CLONE_INITIALIZER(name, create, destroy)			\
diff --git a/sys/net/if_bridge.c b/sys/net/if_bridge.c
index d32e9b9200bc..d55bfc525912 100644
--- a/sys/net/if_bridge.c
+++ b/sys/net/if_bridge.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_bridge.c,v 1.26 2004/10/06 10:01:00 bad Exp $	*/
+/*	$NetBSD: if_bridge.c,v 1.27 2004/12/04 18:31:43 peter Exp $	*/
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -80,7 +80,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.26 2004/10/06 10:01:00 bad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.27 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_bridge_ipf.h"
 #include "opt_inet.h"
@@ -168,7 +168,7 @@ struct pool bridge_rtnode_pool;
 void	bridgeattach(int);
 
 int	bridge_clone_create(struct if_clone *, int);
-void	bridge_clone_destroy(struct ifnet *);
+int	bridge_clone_destroy(struct ifnet *);
 
 int	bridge_ioctl(struct ifnet *, u_long, caddr_t);
 int	bridge_init(struct ifnet *);
@@ -401,7 +401,7 @@ bridge_clone_create(struct if_clone *ifc, int unit)
  *
  *	Destroy a bridge instance.
  */
-void
+int
 bridge_clone_destroy(struct ifnet *ifp)
 {
 	struct bridge_softc *sc = ifp->if_softc;
@@ -425,6 +425,8 @@ bridge_clone_destroy(struct ifnet *ifp)
 	bridge_rtable_fini(sc);
 
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 /*
diff --git a/sys/net/if_faith.c b/sys/net/if_faith.c
index 495e9dc0c811..ae256db0e008 100644
--- a/sys/net/if_faith.c
+++ b/sys/net/if_faith.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_faith.c,v 1.29 2004/08/20 00:37:07 enami Exp $	*/
+/*	$NetBSD: if_faith.c,v 1.30 2004/12/04 18:31:43 peter Exp $	*/
 /*	$KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $	*/
 
 /*
@@ -40,7 +40,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.29 2004/08/20 00:37:07 enami Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.30 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 
@@ -98,7 +98,7 @@ void faithattach __P((int));
 LIST_HEAD(, faith_softc) faith_softc_list;
 
 int	faith_clone_create __P((struct if_clone *, int));
-void	faith_clone_destroy __P((struct ifnet *));
+int	faith_clone_destroy __P((struct ifnet *));
 
 struct if_clone faith_cloner =
     IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
@@ -146,7 +146,7 @@ faith_clone_create(ifc, unit)
 	return (0);
 }
 
-void
+int
 faith_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -158,6 +158,8 @@ faith_clone_destroy(ifp)
 #endif
 	if_detach(ifp);
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 int
diff --git a/sys/net/if_gif.c b/sys/net/if_gif.c
index 10a27669ec53..eb09e39a5b98 100644
--- a/sys/net/if_gif.c
+++ b/sys/net/if_gif.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_gif.c,v 1.46 2004/08/19 20:58:24 christos Exp $	*/
+/*	$NetBSD: if_gif.c,v 1.47 2004/12/04 18:31:43 peter Exp $	*/
 /*	$KAME: if_gif.c,v 1.76 2001/08/20 02:01:02 kjc Exp $	*/
 
 /*
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.46 2004/08/19 20:58:24 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.47 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 #include "opt_iso.h"
@@ -104,7 +104,7 @@ static struct mbuf *gif_eon_decap __P((struct ifnet *, struct mbuf *));
 LIST_HEAD(, gif_softc) gif_softc_list;
 
 int	gif_clone_create __P((struct if_clone *, int));
-void	gif_clone_destroy __P((struct ifnet *));
+int	gif_clone_destroy __P((struct ifnet *));
 
 struct if_clone gif_cloner =
     IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy);
@@ -173,7 +173,7 @@ gifattach0(sc)
 #endif
 }
 
-void
+int
 gif_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -194,6 +194,8 @@ gif_clone_destroy(ifp)
 	if_detach(ifp);
 
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 #ifdef GIF_ENCAPCHECK
diff --git a/sys/net/if_gre.c b/sys/net/if_gre.c
index 4f714bf0ed08..c1df4a8cece8 100644
--- a/sys/net/if_gre.c
+++ b/sys/net/if_gre.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_gre.c,v 1.52 2004/08/19 20:58:24 christos Exp $ */
+/*	$NetBSD: if_gre.c,v 1.53 2004/12/04 18:31:43 peter Exp $ */
 
 /*
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -46,7 +46,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_gre.c,v 1.52 2004/08/19 20:58:24 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_gre.c,v 1.53 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 #include "opt_ns.h"
@@ -111,7 +111,7 @@ struct gre_softc_head gre_softc_list;
 int ip_gre_ttl = GRE_TTL;
 
 int	gre_clone_create __P((struct if_clone *, int));
-void	gre_clone_destroy __P((struct ifnet *));
+int	gre_clone_destroy __P((struct ifnet *));
 
 struct if_clone gre_cloner =
     IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy);
@@ -163,7 +163,7 @@ gre_clone_create(ifc, unit)
 	return (0);
 }
 
-void
+int
 gre_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -175,6 +175,8 @@ gre_clone_destroy(ifp)
 #endif
 	if_detach(ifp);
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 /*
diff --git a/sys/net/if_loop.c b/sys/net/if_loop.c
index 6ecac1d535d5..6cf98f245731 100644
--- a/sys/net/if_loop.c
+++ b/sys/net/if_loop.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_loop.c,v 1.52 2004/12/04 16:10:25 peter Exp $	*/
+/*	$NetBSD: if_loop.c,v 1.53 2004/12/04 18:31:43 peter Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_loop.c,v 1.52 2004/12/04 16:10:25 peter Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_loop.c,v 1.53 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 #include "opt_atalk.h"
@@ -151,7 +151,7 @@ struct loop_softc {
 LIST_HEAD(, loop_softc) loop_softc_list;
 
 int loop_clone_create(struct if_clone *, int);
-void loop_clone_destroy(struct ifnet *);
+int loop_clone_destroy(struct ifnet *);
 
 struct if_clone loop_cloner =
     IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy);
@@ -207,13 +207,13 @@ loop_clone_create(struct if_clone *ifc, int unit)
 	return (0);
 }
 
-void
+int
 loop_clone_destroy(struct ifnet *ifp)
 {
 	struct loop_softc *sc = ifp->if_softc;
 
-	if (ifp == lo0ifp)		/* don't kill lo0 */
-		return;
+	if (ifp == lo0ifp)
+		return (EPERM);
 
 #ifdef MBUFTRACE
 	MOWNER_DETACH(ifp->if_mowner);
@@ -227,6 +227,8 @@ loop_clone_destroy(struct ifnet *ifp)
 
 	LIST_REMOVE(sc, sc_list);
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 int
diff --git a/sys/net/if_pppoe.c b/sys/net/if_pppoe.c
index c9cd28806229..4584b1810add 100644
--- a/sys/net/if_pppoe.c
+++ b/sys/net/if_pppoe.c
@@ -1,4 +1,4 @@
-/* $NetBSD: if_pppoe.c,v 1.55 2004/11/28 17:16:10 skrll Exp $ */
+/* $NetBSD: if_pppoe.c,v 1.56 2004/12/04 18:31:43 peter Exp $ */
 
 /*-
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.55 2004/11/28 17:16:10 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.56 2004/12/04 18:31:43 peter Exp $");
 
 #include "pppoe.h"
 #include "bpfilter.h"
@@ -204,7 +204,7 @@ static int pppoe_ifattach_hook(void *, struct mbuf **, struct ifnet *, int);
 LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
 
 int	pppoe_clone_create __P((struct if_clone *, int));
-void	pppoe_clone_destroy __P((struct ifnet *));
+int	pppoe_clone_destroy __P((struct ifnet *));
 
 struct if_clone pppoe_cloner =
     IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy);
@@ -274,7 +274,7 @@ pppoe_clone_create(ifc, unit)
 	return 0;
 }
 
-void
+int
 pppoe_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -298,6 +298,8 @@ pppoe_clone_destroy(ifp)
 	if (sc->sc_ac_cookie)
 		free(sc->sc_ac_cookie, M_DEVBUF);
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 /*
diff --git a/sys/net/if_stf.c b/sys/net/if_stf.c
index a13513916884..107e96652c79 100644
--- a/sys/net/if_stf.c
+++ b/sys/net/if_stf.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_stf.c,v 1.40 2004/08/19 20:58:24 christos Exp $	*/
+/*	$NetBSD: if_stf.c,v 1.41 2004/12/04 18:31:43 peter Exp $	*/
 /*	$KAME: if_stf.c,v 1.62 2001/06/07 22:32:16 itojun Exp $	*/
 
 /*
@@ -75,7 +75,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.40 2004/08/19 20:58:24 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.41 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 
@@ -144,7 +144,7 @@ struct stf_softc {
 LIST_HEAD(, stf_softc) stf_softc_list;
 
 int	stf_clone_create __P((struct if_clone *, int));
-void	stf_clone_destroy __P((struct ifnet *));
+int	stf_clone_destroy __P((struct ifnet *));
 
 struct if_clone stf_cloner =
     IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy);
@@ -227,7 +227,7 @@ stf_clone_create(ifc, unit)
 	return (0);
 }
 
-void
+int
 stf_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -240,6 +240,8 @@ stf_clone_destroy(ifp)
 #endif
 	if_detach(ifp);
 	free(sc, M_DEVBUF);
+
+	return (0);
 }
 
 static int
diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index 397e1d7570d6..949e775b8602 100644
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_tun.c,v 1.72 2004/08/19 20:58:24 christos Exp $	*/
+/*	$NetBSD: if_tun.c,v 1.73 2004/12/04 18:31:43 peter Exp $	*/
 
 /*
  * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
@@ -15,7 +15,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.72 2004/08/19 20:58:24 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.73 2004/12/04 18:31:43 peter Exp $");
 
 #include "tun.h"
 
@@ -80,7 +80,7 @@ int	tun_ioctl __P((struct ifnet *, u_long, caddr_t));
 int	tun_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
 		       struct rtentry *rt));
 int	tun_clone_create __P((struct if_clone *, int));
-void	tun_clone_destroy __P((struct ifnet *));
+int	tun_clone_destroy __P((struct ifnet *));
 
 struct if_clone tun_cloner =
     IF_CLONE_INITIALIZER("tun", tun_clone_create, tun_clone_destroy);
@@ -230,7 +230,7 @@ tunattach0(tp)
 #endif
 }
 
-void
+int
 tun_clone_destroy(ifp)
 	struct ifnet *ifp;
 {
@@ -271,6 +271,8 @@ tun_clone_destroy(ifp)
 
 	if (!zombie)
 		free(tp, M_DEVBUF);
+
+	return (0);
 }
 
 /*
diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index aca1931e2adf..2a5dc2ca04c0 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_vlan.c,v 1.41 2004/07/08 19:09:12 mycroft Exp $	*/
+/*	$NetBSD: if_vlan.c,v 1.42 2004/12/04 18:31:43 peter Exp $	*/
 
 /*-
  * Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
@@ -85,7 +85,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_vlan.c,v 1.41 2004/07/08 19:09:12 mycroft Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_vlan.c,v 1.42 2004/12/04 18:31:43 peter Exp $");
 
 #include "opt_inet.h"
 #include "bpfilter.h"
@@ -175,7 +175,7 @@ const struct vlan_multisw vlan_ether_multisw = {
 };
 
 static int	vlan_clone_create(struct if_clone *, int);
-static void	vlan_clone_destroy(struct ifnet *);
+static int	vlan_clone_destroy(struct ifnet *);
 static int	vlan_config(struct ifvlan *, struct ifnet *);
 static int	vlan_ioctl(struct ifnet *, u_long, caddr_t);
 static void	vlan_start(struct ifnet *);
@@ -247,7 +247,7 @@ vlan_clone_create(struct if_clone *ifc, int unit)
 	return (0);
 }
 
-static void
+static int
 vlan_clone_destroy(struct ifnet *ifp)
 {
 	struct ifvlan *ifv = ifp->if_softc;
@@ -260,6 +260,8 @@ vlan_clone_destroy(struct ifnet *ifp)
 
 	if_detach(ifp);
 	free(ifv, M_DEVBUF);
+
+	return (0);
 }
 
 /*