freebsd-skq/sys/net/if_gif.c

/*	$FreeBSD$	*/
/*	$KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "opt_inet.h"
#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <sys/protosw.h>
#include <sys/conf.h>
#include <machine/bus.h>	/* XXX: Shouldn't really be required! */
#include <sys/rman.h>
#include <machine/cpu.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef	INET
#include <netinet/in_var.h>
#include <netinet/in_gif.h>
#include <netinet/ip_var.h>
#include <netinet/ipprotosw.h>
#endif	/* INET */

#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/ip6protosw.h>
#endif /* INET6 */

#include <netinet/ip_encap.h>
#include <net/if_gif.h>

#include <net/net_osdep.h>

#define GIFNAME		"gif"
#define GIFDEV		"if_gif"
#define GIF_MAXUNIT	0x7fff	/* ifp->if_unit is only 15 bits */

static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
static struct rman gifunits[1];
TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs);

int	gif_clone_create __P((struct if_clone *, int *));
void	gif_clone_destroy __P((struct ifnet *));

struct if_clone gif_cloner =
    IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy);

static int gifmodevent __P((module_t, int, void *));
void gif_delete_tunnel __P((struct gif_softc *));
static int gif_encapcheck __P((const struct mbuf *, int, int, void *));

#ifdef INET
extern  struct domain inetdomain;
struct ipprotosw in_gif_protosw =
{ SOCK_RAW,	&inetdomain,	0/*IPPROTO_IPV[46]*/,	PR_ATOMIC|PR_ADDR,
  in_gif_input,	rip_output,	0,		rip_ctloutput,
  0,
  0,		0,		0,		0,
  &rip_usrreqs
};
#endif
#ifdef INET6
extern  struct domain6 inet6domain;
struct ip6protosw in6_gif_protosw =
{ SOCK_RAW,	&inet6domain,	0/*IPPROTO_IPV[46]*/,	PR_ATOMIC|PR_ADDR,
  in6_gif_input, rip6_output,	0,		rip6_ctloutput,
  0,
  0,		0,		0,		0,
  &rip6_usrreqs
};
#endif

#ifndef MAX_GIF_NEST
/*
 * This macro controls the upper limitation on nesting of gif tunnels.
 * Since, setting a large value to this macro with a careless configuration
 * may introduce system crash, we don't allow any nestings by default.
 * If you need to configure nested gif tunnels, you can define this macro
 * in your kernel configuration file. However, if you do so, please be
 * careful to configure the tunnels so that it won't make a loop.
 */
#define MAX_GIF_NEST 1
#endif
static int max_gif_nesting = MAX_GIF_NEST;

int
gif_clone_create(ifc, unit)
	struct if_clone *ifc;
	int *unit;
{
	struct resource *r;
	struct gif_softc *sc;

	if (*unit > GIF_MAXUNIT)
		return (ENXIO);

	if (*unit < 0) {
		r = rman_reserve_resource(gifunits, 0, GIF_MAXUNIT, 1,
		    RF_ALLOCATED | RF_ACTIVE, NULL);
		if (r == NULL)
			return (ENOSPC);
		*unit = rman_get_start(r);
	} else {
		r = rman_reserve_resource(gifunits, *unit, *unit, 1,
		    RF_ALLOCATED | RF_ACTIVE, NULL);
		if (r == NULL)
			return (EEXIST);
	}
	
	sc = malloc (sizeof(struct gif_softc), M_GIF, M_WAITOK);
	bzero(sc, sizeof(struct gif_softc));

	sc->gif_if.if_softc = sc;
	sc->gif_if.if_name = GIFNAME;
	sc->gif_if.if_unit = *unit;
	sc->r_unit = r;

	sc->encap_cookie4 = sc->encap_cookie6 = NULL;
#ifdef INET
	sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
	    gif_encapcheck, (struct protosw*)&in_gif_protosw, sc);
	if (sc->encap_cookie4 == NULL) {
		printf("%s: unable to attach encap4\n", if_name(&sc->gif_if));
		free(sc, M_GIF);
		return (EIO);	/* XXX */
	}
#endif
#ifdef INET6
	sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
	    gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc);
	if (sc->encap_cookie6 == NULL) {
		if (sc->encap_cookie4) {
			encap_detach(sc->encap_cookie4);
			sc->encap_cookie4 = NULL;
		}
		printf("%s: unable to attach encap6\n", if_name(&sc->gif_if));
		free(sc, M_GIF);
		return (EIO);	/* XXX */
	}
#endif

	sc->gif_if.if_mtu    = GIF_MTU;
	sc->gif_if.if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
#if 0
	/* turn off ingress filter */
	sc->gif_if.if_flags  |= IFF_LINK2;
#endif
	sc->gif_if.if_ioctl  = gif_ioctl;
	sc->gif_if.if_output = gif_output;
	sc->gif_if.if_type   = IFT_GIF;
	sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
	if_attach(&sc->gif_if);
	bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
	TAILQ_INSERT_TAIL(&gifs, sc, gif_link);
	return (0);
}

void
gif_clone_destroy(ifp)
	struct ifnet *ifp;
{
	int err;
	struct gif_softc *sc = ifp->if_softc;

	gif_delete_tunnel(sc);
	TAILQ_REMOVE(&gifs, sc, gif_link);
	if (sc->encap_cookie4 != NULL) {
		err = encap_detach(sc->encap_cookie4);
		KASSERT(err == 0, ("Unexpected error detaching encap_cookie4"));
	}
	if (sc->encap_cookie6 != NULL) {
		err = encap_detach(sc->encap_cookie6);
		KASSERT(err == 0, ("Unexpected error detaching encap_cookie6"));
	}

	bpfdetach(ifp);
	if_detach(ifp);

	err = rman_release_resource(sc->r_unit);
	KASSERT(err == 0, ("Unexpected error freeing resource"));

	free(sc, M_GIF);
}

static int
gifmodevent(mod, type, data)
	module_t mod;
	int type;
	void *data;
{
	int err;

	switch (type) {
	case MOD_LOAD:
		gifunits->rm_type = RMAN_ARRAY;
		gifunits->rm_descr = "configurable if_gif units";
		err = rman_init(gifunits);
		if (err != 0)
			return (err);
		err = rman_manage_region(gifunits, 0, GIF_MAXUNIT);
		if (err != 0) {
			printf("%s: gifunits: rman_manage_region: Failed %d\n",
			    GIFNAME, err);
			rman_fini(gifunits);
			return (err);
		}
		if_clone_attach(&gif_cloner);

#ifdef INET6
		ip6_gif_hlim = GIF_HLIM;
#endif

		break;
	case MOD_UNLOAD:
		if_clone_detach(&gif_cloner);

		while (!TAILQ_EMPTY(&gifs))
			gif_clone_destroy(&TAILQ_FIRST(&gifs)->gif_if);

		err = rman_fini(gifunits);
		if (err != 0)
			return (err);
#ifdef INET6
		ip6_gif_hlim = 0;
#endif
		break;
	}
	return 0;
}

static moduledata_t gif_mod = {
	"if_gif",
	gifmodevent,
	0
};

DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

static int
gif_encapcheck(m, off, proto, arg)
	const struct mbuf *m;
	int off;
	int proto;
	void *arg;
{
	struct ip ip;
	struct gif_softc *sc;

	sc = (struct gif_softc *)arg;
	if (sc == NULL)
		return 0;

	if ((sc->gif_if.if_flags & IFF_UP) == 0)
		return 0;

	/* no physical address */
	if (!sc->gif_psrc || !sc->gif_pdst)
		return 0;

	switch (proto) {
#ifdef INET
	case IPPROTO_IPV4:
		break;
#endif
#ifdef INET6
	case IPPROTO_IPV6:
		break;
#endif
	default:
		return 0;
	}

	/* LINTED const cast */
	m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);

	switch (ip.ip_v) {
#ifdef INET
	case 4:
		if (sc->gif_psrc->sa_family != AF_INET ||
		    sc->gif_pdst->sa_family != AF_INET)
			return 0;
		return gif_encapcheck4(m, off, proto, arg);
#endif
#ifdef INET6
	case 6:
		if (sc->gif_psrc->sa_family != AF_INET6 ||
		    sc->gif_pdst->sa_family != AF_INET6)
			return 0;
		return gif_encapcheck6(m, off, proto, arg);
#endif
	default:
		return 0;
	}
}

int
gif_output(ifp, m, dst, rt)
	struct ifnet *ifp;
	struct mbuf *m;
	struct sockaddr *dst;
	struct rtentry *rt;	/* added in net2 */
{
	struct gif_softc *sc = (struct gif_softc*)ifp;
	int error = 0;
	static int called = 0;	/* XXX: MUTEX */

	/*
	 * gif may cause infinite recursion calls when misconfigured.
	 * We'll prevent this by introducing upper limit.
	 * XXX: this mechanism may introduce another problem about
	 *      mutual exclusion of the variable CALLED, especially if we
	 *      use kernel thread.
	 */
	if (++called > max_gif_nesting) {
		log(LOG_NOTICE,
		    "gif_output: recursively called too many times(%d)\n",
		    called);
		m_freem(m);
		error = EIO;	/* is there better errno? */
		goto end;
	}

	m->m_flags &= ~(M_BCAST|M_MCAST);
	if (!(ifp->if_flags & IFF_UP) ||
	    sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
		m_freem(m);
		error = ENETDOWN;
		goto end;
	}

	if (ifp->if_bpf) {
		/*
		 * We need to prepend the address family as
		 * a four byte field.  Cons up a dummy header
		 * to pacify bpf.  This is safe because bpf
		 * will only read from the mbuf (i.e., it won't
		 * try to free it or keep a pointer a to it).
		 */
		struct mbuf m0;
		u_int32_t af = dst->sa_family;

		m0.m_next = m;
		m0.m_len = 4;
		m0.m_data = (char *)&af;
		
		bpf_mtap(ifp, &m0);
	}
	ifp->if_opackets++;	
	ifp->if_obytes += m->m_pkthdr.len;

	/* inner AF-specific encapsulation */

	/* XXX should we check if our outer source is legal? */

	/* dispatch to output logic based on outer AF */
	switch (sc->gif_psrc->sa_family) {
#ifdef INET
	case AF_INET:
		error = in_gif_output(ifp, dst->sa_family, m, rt);
		break;
#endif
#ifdef INET6
	case AF_INET6:
		error = in6_gif_output(ifp, dst->sa_family, m, rt);
		break;
#endif
	default:
		m_freem(m);		
		error = ENETDOWN;
		goto end;
	}

  end:
	called = 0;		/* reset recursion counter */
	if (error)
		ifp->if_oerrors++;
	return error;
}

void
gif_input(m, af, gifp)
	struct mbuf *m;
	int af;
	struct ifnet *gifp;
{
	int isr;
	struct ifqueue *ifq = 0;

	if (gifp == NULL) {
		/* just in case */
		m_freem(m);
		return;
	}

	m->m_pkthdr.rcvif = gifp;
	
	if (gifp->if_bpf) {
		/*
		 * We need to prepend the address family as
		 * a four byte field.  Cons up a dummy header
		 * to pacify bpf.  This is safe because bpf
		 * will only read from the mbuf (i.e., it won't
		 * try to free it or keep a pointer a to it).
		 */
		struct mbuf m0;
		u_int32_t af1 = af;
		
		m0.m_next = m;
		m0.m_len = 4;
		m0.m_data = (char *)&af1;
		
		bpf_mtap(gifp, &m0);
	}

	/*
	 * Put the packet to the network layer input queue according to the
	 * specified address family.
	 * Note: older versions of gif_input directly called network layer
	 * input functions, e.g. ip6_input, here. We changed the policy to
	 * prevent too many recursive calls of such input functions, which
	 * might cause kernel panic. But the change may introduce another
	 * problem; if the input queue is full, packets are discarded.
	 * We believed it rarely occurs and changed the policy. If we find
	 * it occurs more times than we thought, we may change the policy
	 * again.
	 */
	switch (af) {
#ifdef INET
	case AF_INET:
		ifq = &ipintrq;
		isr = NETISR_IP;
		break;
#endif
#ifdef INET6
	case AF_INET6:
		ifq = &ip6intrq;
		isr = NETISR_IPV6;
		break;
#endif
	default:
		m_freem(m);
		return;
	}

	gifp->if_ipackets++;
	gifp->if_ibytes += m->m_pkthdr.len;
	(void) IF_HANDOFF(ifq, m, NULL);
	/* we need schednetisr since the address family may change */
	schednetisr(isr);

	return;
}

/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
int
gif_ioctl(ifp, cmd, data)
	struct ifnet *ifp;
	u_long cmd;
	caddr_t data;
{
	struct gif_softc *sc  = (struct gif_softc*)ifp;
	struct ifreq     *ifr = (struct ifreq*)data;
	int error = 0, size;
	struct sockaddr *dst, *src;
	struct sockaddr *sa;
	int s;
	struct ifnet *ifp2;
	struct gif_softc *sc2;
		
	switch (cmd) {
	case SIOCSIFADDR:
		break;
		
	case SIOCSIFDSTADDR:
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		break;

#ifdef	SIOCSIFMTU /* xxx */
	case SIOCGIFMTU:
		break;

	case SIOCSIFMTU:
		{
			u_long mtu;
			mtu = ifr->ifr_mtu;
			if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
				return (EINVAL);
			}
			ifp->if_mtu = mtu;
		}
		break;
#endif /* SIOCSIFMTU */

	case SIOCSIFPHYADDR:
#ifdef INET6
	case SIOCSIFPHYADDR_IN6:
#endif /* INET6 */
	case SIOCSLIFPHYADDR:
		switch (cmd) {
#ifdef INET
		case SIOCSIFPHYADDR:
			src = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_addr);
			dst = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_dstaddr);
			break;
#endif
#ifdef INET6
		case SIOCSIFPHYADDR_IN6:
			src = (struct sockaddr *)
				&(((struct in6_aliasreq *)data)->ifra_addr);
			dst = (struct sockaddr *)
				&(((struct in6_aliasreq *)data)->ifra_dstaddr);
			break;
#endif
		case SIOCSLIFPHYADDR:
			src = (struct sockaddr *)
				&(((struct if_laddrreq *)data)->addr);
			dst = (struct sockaddr *)
				&(((struct if_laddrreq *)data)->dstaddr);
		}

		/* sa_family must be equal */
		if (src->sa_family != dst->sa_family)
			return EINVAL;

		/* validate sa_len */
		switch (src->sa_family) {
#ifdef INET
		case AF_INET:
			if (src->sa_len != sizeof(struct sockaddr_in))
				return EINVAL;
			break;
#endif
#ifdef INET6
		case AF_INET6:
			if (src->sa_len != sizeof(struct sockaddr_in6))
				return EINVAL;
			break;
#endif
		default:
			return EAFNOSUPPORT;
		}
		switch (dst->sa_family) {
#ifdef INET
		case AF_INET:
			if (dst->sa_len != sizeof(struct sockaddr_in))
				return EINVAL;
			break;
#endif
#ifdef INET6
		case AF_INET6:
			if (dst->sa_len != sizeof(struct sockaddr_in6))
				return EINVAL;
			break;
#endif
		default:
			return EAFNOSUPPORT;
		}

		/* check sa_family looks sane for the cmd */
		switch (cmd) {
		case SIOCSIFPHYADDR:
			if (src->sa_family == AF_INET)
				break;
			return EAFNOSUPPORT;
#ifdef INET6
		case SIOCSIFPHYADDR_IN6:
			if (src->sa_family == AF_INET6)
				break;
			return EAFNOSUPPORT;
#endif /* INET6 */
		case SIOCSLIFPHYADDR:
			/* checks done in the above */
			break;
		}

		TAILQ_FOREACH(ifp2, &ifnet, if_link) {
			if (strcmp(ifp2->if_name, GIFNAME) != 0)
				continue;
			sc2 = ifp2->if_softc;
			if (sc2 == sc)
				continue;
			if (!sc2->gif_pdst || !sc2->gif_psrc)
				continue;
			if (sc2->gif_pdst->sa_family != dst->sa_family ||
			    sc2->gif_pdst->sa_len != dst->sa_len ||
			    sc2->gif_psrc->sa_family != src->sa_family ||
			    sc2->gif_psrc->sa_len != src->sa_len)
				continue;
#ifndef XBONEHACK
			/* can't configure same pair of address onto two gifs */
			if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
			    bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
				error = EADDRNOTAVAIL;
				goto bad;
			}
#endif

			/* can't configure multiple multi-dest interfaces */
#define multidest(x) \
	(((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
#ifdef INET6
#define multidest6(x) \
	(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
#endif
			if (dst->sa_family == AF_INET &&
			    multidest(dst) && multidest(sc2->gif_pdst)) {
				error = EADDRNOTAVAIL;
				goto bad;
			}
#ifdef INET6
			if (dst->sa_family == AF_INET6 &&
			    multidest6(dst) && multidest6(sc2->gif_pdst)) {
				error = EADDRNOTAVAIL;
				goto bad;
			}
#endif
		}

		if (sc->gif_psrc)
			free((caddr_t)sc->gif_psrc, M_IFADDR);
		sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
		bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
		sc->gif_psrc = sa;

		if (sc->gif_pdst)
			free((caddr_t)sc->gif_pdst, M_IFADDR);
		sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
		bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
		sc->gif_pdst = sa;

		ifp->if_flags |= IFF_RUNNING;
		s = splimp();
		if_up(ifp);	/* mark interface UP and send up RTM_IFINFO */
		splx(s);

		error = 0;
		break;

#ifdef SIOCDIFPHYADDR
	case SIOCDIFPHYADDR:
		if (sc->gif_psrc) {
			free((caddr_t)sc->gif_psrc, M_IFADDR);
			sc->gif_psrc = NULL;
		}
		if (sc->gif_pdst) {
			free((caddr_t)sc->gif_pdst, M_IFADDR);
			sc->gif_pdst = NULL;
		}
		/* change the IFF_{UP, RUNNING} flag as well? */
		break;
#endif
			
	case SIOCGIFPSRCADDR:
#ifdef INET6
	case SIOCGIFPSRCADDR_IN6:
#endif /* INET6 */
		if (sc->gif_psrc == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}
		src = sc->gif_psrc;
		switch (cmd) {
#ifdef INET
		case SIOCGIFPSRCADDR:
			dst = &ifr->ifr_addr;
			size = sizeof(ifr->ifr_addr);
			break;
#endif /* INET */
#ifdef INET6
		case SIOCGIFPSRCADDR_IN6:
			dst = (struct sockaddr *)
				&(((struct in6_ifreq *)data)->ifr_addr);
			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
			break;
#endif /* INET6 */
		default:
			error = EADDRNOTAVAIL;
			goto bad;
		}
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
		break;
			
	case SIOCGIFPDSTADDR:
#ifdef INET6
	case SIOCGIFPDSTADDR_IN6:
#endif /* INET6 */
		if (sc->gif_pdst == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}
		src = sc->gif_pdst;
		switch (cmd) {
#ifdef INET
		case SIOCGIFPDSTADDR:
			dst = &ifr->ifr_addr;
			size = sizeof(ifr->ifr_addr);
			break;
#endif /* INET */
#ifdef INET6
		case SIOCGIFPDSTADDR_IN6:
			dst = (struct sockaddr *)
				&(((struct in6_ifreq *)data)->ifr_addr);
			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
			break;
#endif /* INET6 */
		default:
			error = EADDRNOTAVAIL;
			goto bad;
		}
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
		break;

	case SIOCGLIFPHYADDR:
		if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
			error = EADDRNOTAVAIL;
			goto bad;
		}

		/* copy src */
		src = sc->gif_psrc;
		dst = (struct sockaddr *)
			&(((struct if_laddrreq *)data)->addr);
		size = sizeof(((struct if_laddrreq *)data)->addr);
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);

		/* copy dst */
		src = sc->gif_pdst;
		dst = (struct sockaddr *)
			&(((struct if_laddrreq *)data)->dstaddr);
		size = sizeof(((struct if_laddrreq *)data)->dstaddr);
		if (src->sa_len > size)
			return EINVAL;
		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
		break;

	case SIOCSIFFLAGS:
		/* if_ioctl() takes care of it */
		break;

	default:
		error = EINVAL;
		break;
	}
 bad:
	return error;
}

void
gif_delete_tunnel(sc)
	struct gif_softc *sc;
{
	/* XXX: NetBSD protects this function with splsoftnet() */

	if (sc->gif_psrc) {
		free((caddr_t)sc->gif_psrc, M_IFADDR);
		sc->gif_psrc = NULL;
	}
	if (sc->gif_pdst) {
		free((caddr_t)sc->gif_pdst, M_IFADDR);
		sc->gif_pdst = NULL;
	}
	/* change the IFF_UP flag as well? */
}