path: root/sys/net/if_fddisubr.c

/*	$OpenBSD: if_fddisubr.c,v 1.25 2001/06/27 06:07:40 kjc Exp $	*/
/*	$NetBSD: if_fddisubr.c,v 1.5 1996/05/07 23:20:21 christos Exp $	*/

/*
 * Copyright (c) 1995
 *	Matt Thomas.  All rights reserved.
 * Copyright (c) 1982, 1989, 1993
 *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)if_fddisubr.c	8.1 (Berkeley) 6/10/93
 */

/*
%%% portions-copyright-nrl-97
Portions of this software are Copyright 1997-1998 by Randall Atkinson,
Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights
Reserved. All rights under this copyright have been assigned to the US
Naval Research Laboratory (NRL). The NRL Copyright Notice and License
Agreement Version 1.1 (January 17, 1995) applies to these portions of the
software.
You should have received a copy of the license with this software. If you
didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>

#include <machine/cpu.h>

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#include <netinet/if_ether.h>
#if defined(__FreeBSD__)
#include <netinet/if_fddi.h>
#else
#include <net/if_fddi.h>
#endif

#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif

#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#include <netinet6/nd6.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#ifdef DECNET
#include <netdnet/dn.h>
#endif

#ifdef ISO
#include <netiso/argo_debug.h>
#include <netiso/iso.h>
#include <netiso/iso_var.h>
#include <netiso/iso_snpac.h>
#endif

#include "bpfilter.h"

#include <netccitt/dll.h>
#include <netccitt/llc_var.h>

#if defined(CCITT)
extern struct ifqueue pkintrq;
#endif

#define senderr(e) { error = (e); goto bad;}

/*
 * This really should be defined in if_llc.h but in case it isn't.
 */
#ifndef llc_snap
#define	llc_snap	llc_un.type_snap
#endif

#if defined(__bsdi__) || defined(__NetBSD__) || defined(__OpenBSD__)
#define	RTALLOC1(a, b)			rtalloc1(a, b)
#define	ARPRESOLVE(a, b, c, d, e, f)	arpresolve(a, b, c, d, e)
#define	TYPEHTONS(t)			(t)
#elif defined(__FreeBSD__)
#define	RTALLOC1(a, b)			rtalloc1(a, b, 0UL)
#define	ARPRESOLVE(a, b, c, d, e, f)	arpresolve(a, b, c, d, e, f)
#define	TYPEHTONS(t)			(htons(t))
#endif
/*
 * FDDI output routine.
 * Encapsulate a packet of type family for the local net.
 * Assumes that ifp is actually pointer to arpcom structure.
 */
int
fddi_output(ifp, m0, dst, rt0)
	register struct ifnet *ifp;
	struct mbuf *m0;
	struct sockaddr *dst;
	struct rtentry *rt0;
{
	u_int16_t type;
	int s, len, error = 0, hdrcmplt = 0;
 	u_char edst[6], esrc[6];
	register struct mbuf *m = m0;
	register struct rtentry *rt;
	struct mbuf *mcopy = (struct mbuf *)0;
	register struct fddi_header *fh;
	struct arpcom *ac = (struct arpcom *)ifp;
	ALTQ_DECL(struct altq_pktattr pktattr;)
	short mflags;

	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
		senderr(ENETDOWN);
	if ((rt = rt0) != NULL) {
		if ((rt->rt_flags & RTF_UP) == 0) {
			if ((rt0 = rt = RTALLOC1(dst, 1)) != NULL)
				rt->rt_refcnt--;
			else 
				senderr(EHOSTUNREACH);
		}
		if (rt->rt_flags & RTF_GATEWAY) {
			if (rt->rt_gwroute == 0)
				goto lookup;
			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
				rtfree(rt); rt = rt0;
			lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 1);
				if ((rt = rt->rt_gwroute) == 0)
					senderr(EHOSTUNREACH);
			}
		}
		if (rt->rt_flags & RTF_REJECT)
			if (rt->rt_rmx.rmx_expire == 0 ||
			    time.tv_sec < rt->rt_rmx.rmx_expire)
				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
	}

	/*
	 * If the queueing discipline needs packet classification,
	 * do it before prepending link headers.
	 */
	IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);

	switch (dst->sa_family) {

#ifdef INET
	case AF_INET:
		if (!ARPRESOLVE(ac, rt, m, dst, edst, rt0))
			return (0);	/* if not yet resolved */
		/* If broadcasting on a simplex interface, loopback a copy */
		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
			mcopy = m_copy(m, 0, (int)M_COPYALL);
		type = htons(ETHERTYPE_IP);
		break;
#endif
#ifdef INET6
	case AF_INET6:
#ifdef OLDIP6OUTPUT
		if (!nd6_resolve(ifp, rt, m, dst, edst))
			return (0);	/* if not yet resolved */
#else
		if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst))
			return 0;
#endif
		type = htons(ETHERTYPE_IPV6);
		break;
#endif
#if 0	/*NRL IPv6*/
#ifdef INET6
	case AF_INET6:
		/*
		 * The bottom line here is to either queue the outgoing packet
		 * in the discovery engine, or fill in edst with something
		 * that'll work.
		 */
		if (m->m_flags & M_MCAST) {
			/*
			 * If multicast dest., then use IPv6 -> Ethernet mcast
			 * mapping.  Really simple.
			 */
			ETHER_MAP_IN6_MULTICAST(((struct sockaddr_in6 *)dst)->sin6_addr,
			    edst);
		} else {
			/* Do unicast neighbor discovery stuff. */
			if (!ipv6_discov_resolve(ifp, rt, m, dst, edst))
 				return 0;
		}
		type = htons(ETHERTYPE_IPV6);
		break;
#endif /* INET6 */
#endif
#ifdef IPX
	case AF_IPX:
		type = htons(ETHERTYPE_IPX);
 		bcopy((caddr_t)&(((struct sockaddr_ipx*)dst)->sipx_addr.ipx_host),
		    (caddr_t)edst, sizeof (edst));
		/* If broadcasting on a simplex interface, loopback a copy */
		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
			mcopy = m_copy(m, 0, (int)M_COPYALL);
		break;
#endif
#ifdef NS
	case AF_NS:
		type = htons(ETHERTYPE_NS);
 		bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
		    (caddr_t)edst, sizeof (edst));
		if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst)))
			return (looutput(ifp, m, dst, rt));
		/* If broadcasting on a simplex interface, loopback a copy */
		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
			mcopy = m_copy(m, 0, (int)M_COPYALL);
		break;
#endif
#ifdef	ISO
	case AF_ISO: {
		int	snpalen;
		struct	llc *l;
		register struct sockaddr_dl *sdl;

		if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
		    sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
			bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
		} else if ((error =
			    iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
					    (char *)edst, &snpalen)) != 0)
			goto bad; /* Not Resolved */
		/* If broadcasting on a simplex interface, loopback a copy */
		if (*edst & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
		    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {
			M_PREPEND(mcopy, sizeof (*fh), M_DONTWAIT);
			if (mcopy) {
				fh = mtod(mcopy, struct fddi_header *);
				bcopy((caddr_t)edst,
				      (caddr_t)fh->fddi_dhost, sizeof (edst));
				bcopy((caddr_t)ac->ac_enaddr,
				      (caddr_t)fh->fddi_shost, sizeof (edst));
			}
		}
		M_PREPEND(m, 3, M_DONTWAIT);
		if (m == NULL)
			return (0);
		type = 0;
		l = mtod(m, struct llc *);
		l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
		l->llc_control = LLC_UI;
#if defined(__FreeBSD__)
		IFDEBUG(D_ETHER)
			int i;
			printf("unoutput: sending pkt to: ");
			for (i=0; i<6; i++)
				printf("%x ", edst[i] & 0xff);
			printf("\n");
		ENDDEBUG
#endif
		} break;
#endif /* ISO */
#ifdef	CCITT
/*	case AF_NSAP: */
	case AF_CCITT: {
		register struct sockaddr_dl *sdl = 
			(struct sockaddr_dl *) rt->rt_gateway;

		if (sdl && sdl->sdl_family == AF_LINK
		    && sdl->sdl_alen > 0) {
			bcopy(LLADDR(sdl), (char *)edst,
				sizeof(edst));
		} else goto bad; /* Not a link interface ? Funny ... */
		if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) &&
		    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {
			M_PREPEND(mcopy, sizeof (*fh), M_DONTWAIT);
			if (mcopy) {
				fh = mtod(mcopy, struct fddi_header *);
				bcopy((caddr_t)edst,
				      (caddr_t)fh->fddi_dhost, sizeof (edst));
				bcopy((caddr_t)ac->ac_enaddr,
				      (caddr_t)fh->fddi_shost, sizeof (edst));
				fh->fddi_fc = FDDIFC_LLC_ASYNC|FDDIFC_LLC_PRIO4;
			}
		}
		type = 0;
#ifdef LLC_DEBUG
		{
			int i;
			register struct llc *l = mtod(m, struct llc *);

			printf("fddi_output: sending LLC2 pkt to: ");
			for (i=0; i<6; i++)
				printf("%x ", edst[i] & 0xff);
			printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 
			    m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff,
			    l->llc_control & 0xff);

		}
#endif /* LLC_DEBUG */
		} break;
#endif /* CCITT */	

	case pseudo_AF_HDRCMPLT:
	{
		struct fddi_header *fh = (struct fddi_header *)dst->sa_data;
		hdrcmplt = 1;
		bcopy((caddr_t)fh->fddi_shost, (caddr_t)esrc, sizeof (esrc));
		/* FALLTHROUGH */
	}

	case AF_UNSPEC:
	{
		struct ether_header *eh;
		eh = (struct ether_header *)dst->sa_data;
 		bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));
		if (*edst & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		type = TYPEHTONS(eh->ether_type);
		break;
	}

#if NBPFILTER > 0
	case AF_IMPLINK:
	{
		fh = mtod(m, struct fddi_header *);
		error = EPROTONOSUPPORT;
		switch (fh->fddi_fc & (FDDIFC_C|FDDIFC_L|FDDIFC_F)) {
			case FDDIFC_LLC_ASYNC: {
				/* legal priorities are 0 through 7 */
				if ((fh->fddi_fc & FDDIFC_Z) > 7)
			        	goto bad;
				break;
			}
			case FDDIFC_LLC_SYNC: {
				/* FDDIFC_Z bits reserved, must be zero */
				if (fh->fddi_fc & FDDIFC_Z)
					goto bad;
				break;
			}
			case FDDIFC_SMT: {
				/* FDDIFC_Z bits must be non zero */
				if ((fh->fddi_fc & FDDIFC_Z) == 0)
					goto bad;
				break;
			}
			default: {
				/* anything else is too dangerous */
               	 		goto bad;
			}
		}
		error = 0;
		if (fh->fddi_dhost[0] & 1)
			m->m_flags |= (M_BCAST|M_MCAST);
		goto queue_it;
	}
#endif
	default:
		printf("%s: can't handle af%d\n", ifp->if_xname,
			dst->sa_family);
		senderr(EAFNOSUPPORT);
	}

	if (mcopy)
		(void) looutput(ifp, mcopy, dst, rt);

	if (type != 0) {
		register struct llc *l;
		M_PREPEND(m, sizeof (struct llc), M_DONTWAIT);
		if (m == 0)
			senderr(ENOBUFS);
		l = mtod(m, struct llc *);
		l->llc_control = LLC_UI;
		l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
		l->llc_snap.org_code[0] = l->llc_snap.org_code[1] = l->llc_snap.org_code[2] = 0;
		bcopy((caddr_t) &type, (caddr_t) &l->llc_snap.ether_type,
			sizeof(u_short));
	}
	/*
	 * Add local net header.  If no space in first mbuf,
	 * allocate another.
	 */
	M_PREPEND(m, sizeof (struct fddi_header), M_DONTWAIT);
	if (m == 0)
		senderr(ENOBUFS);
	fh = mtod(m, struct fddi_header *);
	fh->fddi_fc = FDDIFC_LLC_ASYNC|FDDIFC_LLC_PRIO4;
 	bcopy((caddr_t)edst, (caddr_t)fh->fddi_dhost, sizeof (edst));
#if NBPFILTER > 0
  queue_it:
#endif
	if (hdrcmplt)
		bcopy((caddr_t)esrc, (caddr_t)fh->fddi_shost,
		    sizeof(fh->fddi_shost));
	else
 		bcopy((caddr_t)ac->ac_enaddr, (caddr_t)fh->fddi_shost,
		    sizeof(fh->fddi_shost));
	mflags = m->m_flags;
	len = m->m_pkthdr.len;
	s = splimp();
	/*
	 * Queue message on interface, and start output if interface
	 * not yet active.
	 */
	IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
	if (error) {
		/* mbuf is already freed */
		splx(s);
		return (error);
	}
	ifp->if_obytes += len;
	if (mflags & M_MCAST)
		ifp->if_omcasts++;
	if ((ifp->if_flags & IFF_OACTIVE) == 0)
		(*ifp->if_start)(ifp);
	splx(s);
	return (error);

bad:
	if (m)
		m_freem(m);
	return (error);
}

/*
 * Process a received FDDI packet;
 * the packet is in the mbuf chain m without
 * the fddi header, which is provided separately.
 */
void
fddi_input(ifp, fh, m)
	struct ifnet *ifp;
	register struct fddi_header *fh;
	struct mbuf *m;
{
	register struct ifqueue *inq;
	register struct llc *l;
#ifdef	ISO
	struct arpcom *ac = (struct arpcom *)ifp;
#endif
	int s;

	if ((ifp->if_flags & IFF_UP) == 0) {
		m_freem(m);
		return;
	}
	ifp->if_ibytes += m->m_pkthdr.len + sizeof (*fh);
	if (bcmp((caddr_t)fddibroadcastaddr, (caddr_t)fh->fddi_dhost,
	    sizeof(fddibroadcastaddr)) == 0)
		m->m_flags |= M_BCAST;
	else if (fh->fddi_dhost[0] & 1)
		m->m_flags |= M_MCAST;
	if (m->m_flags & (M_BCAST|M_MCAST))
		ifp->if_imcasts++;

	l = mtod(m, struct llc *);
	switch (l->llc_dsap) {
#if defined(INET) || defined(IPX) || defined(NS) || defined(DECNET) || defined(INET6)
	case LLC_SNAP_LSAP:
	{
		u_int16_t etype;
		if (l->llc_control != LLC_UI || l->llc_ssap != LLC_SNAP_LSAP)
			goto dropanyway;
		if (l->llc_snap.org_code[0] != 0 || l->llc_snap.org_code[1] != 0|| l->llc_snap.org_code[2] != 0)
			goto dropanyway;
		etype = ntohs(l->llc_snap.ether_type);
		m_adj(m, LLC_SNAPFRAMELEN);
		switch (etype) {
#ifdef INET
		case ETHERTYPE_IP:
			schednetisr(NETISR_IP);
			inq = &ipintrq;
			break;

		case ETHERTYPE_ARP:
			if (ifp->if_flags & IFF_NOARP)
				goto dropanyway;
			schednetisr(NETISR_ARP);
			inq = &arpintrq;
			break;
#endif
#ifdef INET6
		case ETHERTYPE_IPV6:
			schednetisr(NETISR_IPV6);
			inq = &ip6intrq;
			break;
#endif /* INET6 */
#ifdef IPX
		case ETHERTYPE_IPX:
			schednetisr(NETISR_IPX);
			inq = &ipxintrq;
			break;
#endif
#ifdef NS
		case ETHERTYPE_NS:
			schednetisr(NETISR_NS);
			inq = &nsintrq;
			break;
#endif
#ifdef DECNET
		case ETHERTYPE_DECNET:
			schednetisr(NETISR_DECNET);
			inq = &decnetintrq;
			break;
#endif
		default:
			/* printf("fddi_input: unknown protocol 0x%x\n", etype); */
			ifp->if_noproto++;
			goto dropanyway;
		}
		break;
	}
#endif /* INET || IPX || NS || DECNET */
#ifdef	ISO
	case LLC_ISO_LSAP: 
		switch (l->llc_control) {
		case LLC_UI:
			/* LLC_UI_P forbidden in class 1 service */
			if ((l->llc_dsap == LLC_ISO_LSAP) &&
			    (l->llc_ssap == LLC_ISO_LSAP)) {
				/* LSAP for ISO */
				m->m_data += 3;		/* XXX */
				m->m_len -= 3;		/* XXX */
				m->m_pkthdr.len -= 3;	/* XXX */
				M_PREPEND(m, sizeof *fh, M_DONTWAIT);
				if (m == 0)
					return;
				*mtod(m, struct fddi_header *) = *fh;
#if defined(__FreeBSD__)
				IFDEBUG(D_ETHER)
					printf("clnp packet");
				ENDDEBUG
#endif
				schednetisr(NETISR_ISO);
				inq = &clnlintrq;
				break;
			}
			goto dropanyway;
			
		case LLC_XID:
		case LLC_XID_P:
			if(m->m_len < 6)
				goto dropanyway;
			l->llc_window = 0;
			l->llc_fid = 9;
			l->llc_class = 1;
			l->llc_dsap = l->llc_ssap = 0;
			/* Fall through to */
		case LLC_TEST:
		case LLC_TEST_P:
		{
			struct sockaddr sa;
			register struct ether_header *eh;
			int i;
			u_char c = l->llc_dsap;

			l->llc_dsap = l->llc_ssap;
			l->llc_ssap = c;
			if (m->m_flags & (M_BCAST | M_MCAST))
				bcopy((caddr_t)ac->ac_enaddr,
				      (caddr_t)fh->fddi_dhost, 6);
			sa.sa_family = AF_UNSPEC;
			sa.sa_len = sizeof(sa);
			eh = (struct ether_header *)sa.sa_data;
			for (i = 0; i < 6; i++) {
				eh->ether_shost[i] = c = fh->fddi_dhost[i];
				eh->ether_dhost[i] = 
					fh->fddi_dhost[i] = fh->fddi_shost[i];
				fh->fddi_shost[i] = c;
			}
			eh->ether_type = 0;
			ifp->if_output(ifp, m, &sa, NULL);
			return;
		}
		default:
			m_freem(m);
			return;
		}
		break;
#endif /* ISO */
#ifdef CCITT
	case LLC_X25_LSAP:
	{
		M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT);
		if (m == 0)
			return;
		if ( !sdl_sethdrif(ifp, fh->fddi_shost, LLC_X25_LSAP,
				    fh->fddi_dhost, LLC_X25_LSAP, 6, 
				    mtod(m, struct sdl_hdr *)))
			panic("ETHER cons addr failure");
		mtod(m, struct sdl_hdr *)->sdlhdr_len = m->m_pkthdr.len - sizeof(struct sdl_hdr);
#ifdef LLC_DEBUG
		printf("llc packet\n");
#endif /* LLC_DEBUG */
		schednetisr(NETISR_CCITT);
		inq = &llcintrq;
		break;
	}
#endif /* CCITT */
		
	default:
		/* printf("fddi_input: unknown dsap 0x%x\n", l->llc_dsap); */
		ifp->if_noproto++;
	dropanyway:
		m_freem(m);
		return;
	}

	s = splimp();
	if (IF_QFULL(inq)) {
		IF_DROP(inq);
		m_freem(m);
	} else
		IF_ENQUEUE(inq, m);
	splx(s);
}
/*
 * Perform common duties while attaching to interface list
 */
void
fddi_ifattach(ifp)
	register struct ifnet *ifp;
{
	register struct ifaddr *ifa;
	register struct sockaddr_dl *sdl;

	ifp->if_type = IFT_FDDI;
	ifp->if_addrlen = 6;
	ifp->if_hdrlen = 21;
	ifp->if_mtu = FDDIMTU;
	ifp->if_output = fddi_output;
#if defined(__NetBSD__) || defined(__OpenBSD__)
	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
	    ifa = ifa->ifa_list.tqe_next)
#else
	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#endif
		if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
		    sdl->sdl_family == AF_LINK) {
			sdl->sdl_type = IFT_FDDI;
			sdl->sdl_alen = ifp->if_addrlen;
			bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
			      LLADDR(sdl), ifp->if_addrlen);
			break;
		}
}