Index: sbin/ifconfig/ifconfig.c
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.c,v
retrieving revision 1.315
diff -u -p -r1.315 ifconfig.c
--- sbin/ifconfig/ifconfig.c	13 Jan 2016 09:35:45 -0000	1.315
+++ sbin/ifconfig/ifconfig.c	1 Mar 2016 11:48:09 -0000
@@ -181,6 +181,9 @@ void	settunnelinst(const char *, int);
 void	settunnelttl(const char *, int);
 void	setvnetid(const char *, int);
 void	delvnetid(const char *, int);
+void	setifparent(const char *, int);
+void	delifparent(const char *, int);
+void	getifparent(void);
 #ifdef INET6
 void	setia6flags(const char *, int);
 void	setia6pltime(const char *, int);
@@ -412,6 +415,8 @@ const struct	cmd {
 	{ "tunnelttl",	NEXTARG,	0,		settunnelttl } ,
 	{ "vnetid",	NEXTARG,	0,		setvnetid },
 	{ "-vnetid",	0,		0,		delvnetid },
+	{ "parent",	NEXTARG,	0,		setifparent },
+	{ "-parent",	1,		0,		delifparent },
 	{ "pppoedev",	NEXTARG,	0,		setpppoe_dev },
 	{ "pppoesvc",	NEXTARG,	0,		setpppoe_svc },
 	{ "-pppoesvc",	1,		0,		setpppoe_svc },
@@ -2938,6 +2943,7 @@ status(int link, struct sockaddr_dl *sdl
 		printf("\tpatch: %s\n", ifname);
 #endif
 	vlan_status();
+	getifparent();
 #ifndef SMALL
 	carp_status();
 	pfsync_status();
@@ -3390,6 +3396,51 @@ delvnetid(const char *ignored, int alsoi
 {
 	if (ioctl(s, SIOCDVNETID, &ifr) < 0)
 		warn("SIOCDVNETID");
+}
+
+void
+setifparent(const char *id, int param)
+{
+	struct if_parent ifp;
+
+	if (strlcpy(ifp.ifp_name, name, sizeof(ifp.ifp_name)) >=
+	    sizeof(ifp.ifp_name))
+		errx(1, "parent: name too long");
+
+	if (strlcpy(ifp.ifp_parent, id, sizeof(ifp.ifp_parent)) >=
+	    sizeof(ifp.ifp_parent))
+		errx(1, "parent: parent too long");
+
+	if (ioctl(s, SIOCSIFPARENT, (caddr_t)&ifp) < 0)
+		warn("SIOCSIFPARENT");
+}
+
+/* ARGSUSED */
+void
+delifparent(const char *ignored, int alsoignored)
+{
+	if (ioctl(s, SIOCDIFPARENT, &ifr) < 0)
+		warn("SIOCDIFPARENT");
+}
+
+void
+getifparent(void)
+{
+	struct if_parent ifp;
+	const char *parent = "none";
+
+	memset(&ifp, 0, sizeof(ifp));
+	if (strlcpy(ifp.ifp_name, name, sizeof(ifp.ifp_name)) >=
+	    sizeof(ifp.ifp_name))
+		errx(1, "parent: name too long");
+
+	if (ioctl(s, SIOCGIFPARENT, (caddr_t)&ifp) == -1) {
+		if (errno != EADDRNOTAVAIL)
+			return;
+	} else
+		parent = ifp.ifp_parent;
+
+	printf("\tparent: %s\n", parent);
 }
 
 void
Index: sys/net/if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.426
diff -u -p -r1.426 if.c
--- sys/net/if.c	28 Feb 2016 15:46:19 -0000	1.426
+++ sys/net/if.c	1 Mar 2016 11:48:13 -0000
@@ -1754,6 +1754,8 @@ ifioctl(struct socket *so, u_long cmd, c
 	case SIOCSIFMEDIA:
 	case SIOCSVNETID:
 	case SIOCSIFPAIR:
+	case SIOCSIFPARENT:
+	case SIOCDIFPARENT:
 		if ((error = suser(p, 0)) != 0)
 			return (error);
 		/* FALLTHROUGH */
@@ -1765,6 +1767,7 @@ ifioctl(struct socket *so, u_long cmd, c
 	case SIOCGIFMEDIA:
 	case SIOCGVNETID:
 	case SIOCGIFPAIR:
+	case SIOCGIFPARENT:
 		if (ifp->if_ioctl == 0)
 			return (EOPNOTSUPP);
 		error = (*ifp->if_ioctl)(ifp, cmd, data);
Index: sys/net/if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.175
diff -u -p -r1.175 if.h
--- sys/net/if.h	5 Dec 2015 19:04:37 -0000	1.175
+++ sys/net/if.h	1 Mar 2016 11:48:13 -0000
@@ -444,6 +444,12 @@ struct if_afreq {
 	sa_family_t	ifar_af;
 };
 
+/* SIOC[SG]IFPARENT */
+struct if_parent {
+	char		ifp_name[IFNAMSIZ];
+	char		ifp_parent[IFNAMSIZ];
+};
+
 #include <net/if_arp.h>
 
 #ifdef _KERNEL
Index: sys/sys/sockio.h
===================================================================
RCS file: /cvs/src/sys/sys/sockio.h,v
retrieving revision 1.62
diff -u -p -r1.62 sockio.h
--- sys/sys/sockio.h	24 Oct 2015 10:52:05 -0000	1.62
+++ sys/sys/sockio.h	1 Mar 2016 11:48:13 -0000
@@ -199,6 +199,10 @@
 #define SIOCSIFPAIR	_IOW('i', 176, struct ifreq)	/* set paired if */ 
 #define SIOCGIFPAIR	_IOWR('i', 177, struct ifreq)	/* get paired if */
 
+#define SIOCSIFPARENT	_IOW('i', 178, struct if_parent) /* set parent if */
+#define SIOCGIFPARENT	_IOWR('i', 179, struct if_parent) /* get parent if */
+#define SIOCDIFPARENT	_IOW('i', 180, struct ifreq)	/* del parent if */
+
 #define	SIOCSVH		_IOWR('i', 245, struct ifreq)	/* set carp param */
 #define	SIOCGVH		_IOWR('i', 246, struct ifreq)	/* get carp param */