- generic Arcnet framework

- device driver for SMC COM90cx6 Arcnet network adapters

Obtained from:	NetBSD

1 files changed, 780 insertions, 0 deletions

diff --git a/sys/net/if_arcsubr.c b/sys/net/if_arcsubr.c
new file mode 100644
index 0000000..d47dee9
--- /dev/null
+++ b/sys/net/if_arcsubr.c
@@ -0,0 +1,780 @@
+/*	$NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $	*/
+/*	$FreeBSD$ */
+
+/*
+ * Copyright (c) 1994, 1995 Ignatios Souvatzis
+ * 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.
+ *
+ * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
+ *       @(#)if_ethersubr.c	8.1 (Berkeley) 6/10/93
+ *
+ */
+#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/protosw.h>
+#include <sys/socket.h>
+#include <sys/sockio.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_dl.h>
+#include <net/if_types.h>
+#include <net/if_arc.h>
+#include <net/if_arp.h>
+#include <net/bpf.h>
+
+#if defined(INET) || defined(INET6)
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/if_ether.h>
+#endif
+
+#ifdef INET6
+#include <netinet6/nd6.h>
+#endif
+
+MODULE_VERSION(arcnet, 1);
+
+#define ARCNET_ALLOW_BROKEN_ARP
+
+static struct mbuf *arc_defrag __P((struct ifnet *, struct mbuf *));
+
+u_int8_t  arcbroadcastaddr = 0;
+
+#define senderr(e) { error = (e); goto bad;}
+#define SIN(s) ((struct sockaddr_in *)s)
+
+/*
+ * ARCnet output routine.
+ * Encapsulate a packet of type family for the local net.
+ * Assumes that ifp is actually pointer to arccom structure.
+ */
+int
+arc_output(ifp, m, dst, rt0)
+	struct ifnet *ifp;
+	struct mbuf *m;
+	struct sockaddr *dst;
+	struct rtentry *rt0;
+{
+	struct mbuf		*mcopy;
+	struct rtentry		*rt;
+	struct arccom		*ac;
+	struct arc_header	*ah;
+	struct arphdr		*arph;
+	int			error;
+	u_int8_t		atype, adst;
+#if __FreeBSD_version < 500000
+	int			s;
+#endif
+
+	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
+		return(ENETDOWN); /* m, m1 aren't initialized yet */
+
+	error = 0;
+	ac = (struct arccom *)ifp;
+	mcopy = NULL;
+
+	if ((rt = rt0)) {
+		if ((rt->rt_flags & RTF_UP) == 0) {
+			if ((rt0 = rt = rtalloc1(dst, 1, 0UL)))
+				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, 0UL);
+				if ((rt = rt->rt_gwroute) == 0)
+					senderr(EHOSTUNREACH);
+			}
+		}
+		if (rt->rt_flags & RTF_REJECT)
+			if (rt->rt_rmx.rmx_expire == 0 ||
+			    time_second < rt->rt_rmx.rmx_expire)
+				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
+	}
+
+	switch (dst->sa_family) {
+#ifdef INET
+	case AF_INET:
+
+		/*
+		 * For now, use the simple IP addr -> ARCnet addr mapping
+		 */
+		if (m->m_flags & (M_BCAST|M_MCAST))
+			adst = arcbroadcastaddr; /* ARCnet broadcast address */
+		else if (ifp->if_flags & IFF_NOARP)
+			adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
+		else if (!arpresolve(ifp, rt, m, dst, &adst, rt0))
+			return 0;	/* not resolved yet */
+
+		/* If broadcasting on a simplex interface, loopback a copy */
+		if ((m->m_flags & (M_BCAST|M_MCAST)) &&
+		    (ifp->if_flags & IFF_SIMPLEX))
+			mcopy = m_copy(m, 0, (int)M_COPYALL);
+		atype = (ifp->if_flags & IFF_LINK0) ?
+			ARCTYPE_IP_OLD : ARCTYPE_IP;
+		break;
+#endif
+#ifdef INET6
+	case AF_INET6:
+#ifdef OLDIP6OUTPUT
+		if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst))
+			return(0);	/* if not yet resolves */
+#else
+		if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst))
+			return(0); /* it must be impossible, but... */
+#endif /* OLDIP6OUTPUT */
+		atype = ARCTYPE_INET6;
+		break;
+#endif
+
+	case AF_UNSPEC:
+		ah = (struct arc_header *)dst->sa_data;
+		adst = ah->arc_dhost;
+		atype = ah->arc_type;
+
+		if (atype == ARCTYPE_ARP) {
+			atype = (ifp->if_flags & IFF_LINK0) ?
+			    ARCTYPE_ARP_OLD: ARCTYPE_ARP;
+
+#ifdef ARCNET_ALLOW_BROKEN_ARP
+			/*
+			 * XXX It's not clear per RFC826 if this is needed, but
+			 * "assigned numbers" say this is wrong.
+			 * However, e.g., AmiTCP 3.0Beta used it... we make this
+			 * switchable for emergency cases. Not perfect, but...
+			 */
+			arph = mtod(m, struct arphdr *);
+			if (ifp->if_flags & IFF_LINK2)
+				arph->ar_pro = atype - 1;
+#endif
+		}
+		break;
+
+	default:
+		printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
+		    dst->sa_family);
+		senderr(EAFNOSUPPORT);
+	}
+
+	if (mcopy)
+		(void) if_simloop(ifp, mcopy, dst->sa_family, 0);
+
+	M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT);
+	if (m == 0)
+		senderr(ENOBUFS);
+	ah = mtod(m, struct arc_header *);
+	ah->arc_type = atype;
+	ah->arc_dhost = adst;
+	ah->arc_shost = *IF_LLADDR(ifp);
+
+	if (ifp->if_bpf)
+		bpf_mtap(ifp, m);
+
+#if __FreeBSD_version < 500000
+	s = splimp();
+
+	/*
+	 * Queue message on interface, and start output if interface
+	 * not yet active.
+	 */
+	if (IF_QFULL(&ifp->if_snd)) {
+		IF_DROP(&ifp->if_snd);
+		splx(s);
+		senderr(ENOBUFS);
+	}
+	ifp->if_obytes += m->m_pkthdr.len;
+	IF_ENQUEUE(&ifp->if_snd, m);
+	if ((ifp->if_flags & IFF_OACTIVE) == 0)
+		(*ifp->if_start)(ifp);
+	splx(s);
+#else
+	if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) {
+		m = 0;
+		senderr(ENOBUFS);
+	}
+#endif
+
+	return (error);
+
+bad:
+	if (m)
+		m_freem(m);
+	return (error);
+}
+
+void
+arc_frag_init(ifp)
+	struct ifnet *ifp;
+{
+	struct arccom *ac;
+
+	ac = (struct arccom *)ifp;
+	ac->curr_frag = 0;
+}
+
+struct mbuf *
+arc_frag_next(ifp)
+	struct ifnet *ifp;
+{
+	struct arccom *ac;
+	struct mbuf *m;
+	struct arc_header *ah;
+
+	ac = (struct arccom *)ifp;
+	if ((m = ac->curr_frag) == 0) {
+		int tfrags;
+
+		/* dequeue new packet */
+		IF_DEQUEUE(&ifp->if_snd, m);
+		if (m == 0)
+			return 0;
+
+		ah = mtod(m, struct arc_header *);
+		if (!arc_isphds(ah->arc_type))
+			return m;
+
+		++ac->ac_seqid;		/* make the seqid unique */
+		tfrags = (m->m_pkthdr.len + 503) / 504;
+		ac->fsflag = 2 * tfrags - 3;
+		ac->sflag = 0;
+		ac->rsflag = ac->fsflag;
+		ac->arc_dhost = ah->arc_dhost;
+		ac->arc_shost = ah->arc_shost;
+		ac->arc_type = ah->arc_type;
+
+		m_adj(m, ARC_HDRLEN);
+		ac->curr_frag = m;
+	}
+
+	/* split out next fragment and return it */
+	if (ac->sflag < ac->fsflag) {
+		/* we CAN'T have short packets here */
+		ac->curr_frag = m_split(m, 504, M_DONTWAIT);
+		if (ac->curr_frag == 0) {
+			m_free(m);
+			return 0;
+		}
+
+		M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
+		if (m == 0) {
+			m_free(ac->curr_frag);
+			ac->curr_frag = 0;
+
+			m_free(m);
+			return 0;
+		}
+
+		ah = mtod(m, struct arc_header *);
+		ah->arc_flag = ac->rsflag;
+		ah->arc_seqid = ac->ac_seqid;
+
+		ac->sflag += 2;
+		ac->rsflag = ac->sflag;
+	} else if ((m->m_pkthdr.len >=
+	    ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
+	    (m->m_pkthdr.len <=
+	    ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
+		ac->curr_frag = 0;
+
+		M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT);
+		if (m == 0)
+			return 0;
+
+		ah = mtod(m, struct arc_header *);
+		ah->arc_flag = 0xFF;
+		ah->arc_seqid = 0xFFFF;
+		ah->arc_type2 = ac->arc_type;
+		ah->arc_flag2 = ac->sflag;
+		ah->arc_seqid2 = ac->ac_seqid;
+	} else {
+		ac->curr_frag = 0;
+
+		M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
+		if (m == 0)
+			return 0;
+
+		ah = mtod(m, struct arc_header *);
+		ah->arc_flag = ac->sflag;
+		ah->arc_seqid = ac->ac_seqid;
+	}
+
+	ah->arc_dhost = ac->arc_dhost;
+	ah->arc_shost = ac->arc_shost;
+	ah->arc_type = ac->arc_type;
+
+	return m;
+}
+
+/*
+ * Defragmenter. Returns mbuf if last packet found, else
+ * NULL. frees imcoming mbuf as necessary.
+ */
+
+__inline struct mbuf *
+arc_defrag(ifp, m)
+	struct ifnet *ifp;
+	struct mbuf *m;
+{
+	struct arc_header *ah, *ah1;
+	struct arccom *ac;
+	struct ac_frag *af;
+	struct mbuf *m1;
+	char *s;
+	int newflen;
+	u_char src,dst,typ;
+
+	ac = (struct arccom *)ifp;
+
+	if (m->m_len < ARC_HDRNEWLEN) {
+		m = m_pullup(m, ARC_HDRNEWLEN);
+		if (m == NULL) {
+			++ifp->if_ierrors;
+			return NULL;
+		}
+	}
+
+	ah = mtod(m, struct arc_header *);
+	typ = ah->arc_type;
+
+	if (!arc_isphds(typ))
+		return m;
+
+	src = ah->arc_shost;
+	dst = ah->arc_dhost;
+
+	if (ah->arc_flag == 0xff) {
+		m_adj(m, 4);
+
+		if (m->m_len < ARC_HDRNEWLEN) {
+			m = m_pullup(m, ARC_HDRNEWLEN);
+			if (m == NULL) {
+				++ifp->if_ierrors;
+				return NULL;
+			}
+		}
+
+		ah = mtod(m, struct arc_header *);
+	}
+
+	af = &ac->ac_fragtab[src];
+	m1 = af->af_packet;
+	s = "debug code error";
+
+	if (ah->arc_flag & 1) {
+		/*
+		 * first fragment. We always initialize, which is
+		 * about the right thing to do, as we only want to
+		 * accept one fragmented packet per src at a time.
+		 */
+		if (m1 != NULL)
+			m_freem(m1);
+
+		af->af_packet = m;
+		m1 = m;
+		af->af_maxflag = ah->arc_flag;
+		af->af_lastseen = 0;
+		af->af_seqid = ah->arc_seqid;
+
+		return NULL;
+		/* notreached */
+	} else {
+		/* check for unfragmented packet */
+		if (ah->arc_flag == 0)
+			return m;
+
+		/* do we have a first packet from that src? */
+		if (m1 == NULL) {
+			s = "no first frag";
+			goto outofseq;
+		}
+
+		ah1 = mtod(m1, struct arc_header *);
+
+		if (ah->arc_seqid != ah1->arc_seqid) {
+			s = "seqid differs";
+			goto outofseq;
+		}
+
+		if (typ != ah1->arc_type) {
+			s = "type differs";
+			goto outofseq;
+		}
+
+		if (dst != ah1->arc_dhost) {
+			s = "dest host differs";
+			goto outofseq;
+		}
+
+		/* typ, seqid and dst are ok here. */
+
+		if (ah->arc_flag == af->af_lastseen) {
+			m_freem(m);
+			return NULL;
+		}
+
+		if (ah->arc_flag == af->af_lastseen + 2) {
+			/* ok, this is next fragment */
+			af->af_lastseen = ah->arc_flag;
+			m_adj(m,ARC_HDRNEWLEN);
+
+			/*
+			 * m_cat might free the first mbuf (with pkthdr)
+			 * in 2nd chain; therefore:
+			 */
+
+			newflen = m->m_pkthdr.len;
+
+			m_cat(m1,m);
+
+			m1->m_pkthdr.len += newflen;
+
+			/* is it the last one? */
+			if (af->af_lastseen > af->af_maxflag) {
+				af->af_packet = NULL;
+				return(m1);
+			} else
+				return NULL;
+		}
+		s = "other reason";
+		/* if all else fails, it is out of sequence, too */
+	}
+outofseq:
+	if (m1) {
+		m_freem(m1);
+		af->af_packet = NULL;
+	}
+
+	if (m)
+		m_freem(m);
+
+	log(LOG_INFO,"%s%d: got out of seq. packet: %s\n",
+	    ifp->if_name, ifp->if_unit, s);
+
+	return NULL;
+}
+
+/*
+ * return 1 if Packet Header Definition Standard, else 0.
+ * For now: old IP, old ARP aren't obviously. Lacking correct information,
+ * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
+ * (Apple and Novell corporations were involved, among others, in PHDS work).
+ * Easiest is to assume that everybody else uses that, too.
+ */
+int
+arc_isphds(type)
+	u_int8_t type;
+{
+	return (type != ARCTYPE_IP_OLD &&
+		type != ARCTYPE_ARP_OLD &&
+		type != ARCTYPE_DIAGNOSE);
+}
+
+/*
+ * Process a received Arcnet packet;
+ * the packet is in the mbuf chain m with
+ * the ARCnet header.
+ */
+void
+arc_input(ifp, m)
+	struct ifnet *ifp;
+	struct mbuf *m;
+{
+	struct arc_header *ah;
+	struct ifqueue *inq;
+	u_int8_t atype;
+#ifdef INET
+	struct arphdr *arph;
+#endif
+#if __FreeBSD_version < 500000
+	int s;
+#endif
+
+	if ((ifp->if_flags & IFF_UP) == 0) {
+		m_freem(m);
+		return;
+	}
+
+	/* possibly defragment: */
+	m = arc_defrag(ifp, m);
+	if (m == NULL)
+		return;
+
+	if (ifp->if_bpf)
+		bpf_mtap(ifp, m);
+
+	ah = mtod(m, struct arc_header *);
+
+	ifp->if_ibytes += m->m_pkthdr.len;
+
+	if (arcbroadcastaddr == ah->arc_dhost) {
+		m->m_flags |= M_BCAST|M_MCAST;
+		ifp->if_imcasts++;
+	}
+
+	atype = ah->arc_type;
+	switch (atype) {
+#ifdef INET
+	case ARCTYPE_IP:
+		m_adj(m, ARC_HDRNEWLEN);
+		schednetisr(NETISR_IP);
+		inq = &ipintrq;
+		break;
+
+	case ARCTYPE_IP_OLD:
+		m_adj(m, ARC_HDRLEN);
+		schednetisr(NETISR_IP);
+		inq = &ipintrq;
+		break;
+
+	case ARCTYPE_ARP:
+		if (ifp->if_flags & IFF_NOARP) {
+			/* Discard packet if ARP is disabled on interface */
+			m_freem(m);
+			return;
+		}
+		m_adj(m, ARC_HDRNEWLEN);
+		schednetisr(NETISR_ARP);
+		inq = &arpintrq;
+#ifdef ARCNET_ALLOW_BROKEN_ARP
+		mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
+#endif
+		break;
+
+	case ARCTYPE_ARP_OLD:
+		if (ifp->if_flags & IFF_NOARP) {
+			/* Discard packet if ARP is disabled on interface */
+			m_freem(m);
+			return;
+		}
+		m_adj(m, ARC_HDRLEN);
+		schednetisr(NETISR_ARP);
+		inq = &arpintrq;
+		arph = mtod(m, struct arphdr *);
+#ifdef ARCNET_ALLOW_BROKEN_ARP
+		mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
+#endif
+		break;
+#endif
+#ifdef INET6
+	case ARCTYPE_INET6:
+		m_adj(m, ARC_HDRNEWLEN);
+		schednetisr(NETISR_IPV6);
+		inq = &ip6intrq;
+		break;
+#endif
+	default:
+		m_freem(m);
+		return;
+	}
+
+#if __FreeBSD_version < 500000
+	s = splimp();
+	if (IF_QFULL(inq)) {
+		IF_DROP(inq);
+		m_freem(m);
+	} else
+		IF_ENQUEUE(inq, m);
+	splx(s);
+#else
+	IF_HANDOFF(inq, m, NULL);
+#endif
+}
+
+/*
+ * Convert Arcnet address to printable (loggable) representation.
+ */
+static char digits[] = "0123456789abcdef";
+char *
+arc_sprintf(ap)
+	u_int8_t *ap;
+{
+	static char arcbuf[3];
+	char *cp = arcbuf;
+
+	*cp++ = digits[*ap >> 4];
+	*cp++ = digits[*ap++ & 0xf];
+	*cp   = 0;
+	return (arcbuf);
+}
+
+/*
+ * Register (new) link level address.
+ */
+void
+arc_storelladdr(ifp, lla)
+	struct ifnet *ifp;
+	u_int8_t lla;
+{
+	*IF_LLADDR(ifp) = lla;
+}
+
+/*
+ * Perform common duties while attaching to interface list
+ */
+void
+arc_ifattach(ifp, lla)
+	struct ifnet *ifp;
+	u_int8_t lla;
+{
+	struct ifaddr *ifa;
+	struct sockaddr_dl *sdl;
+	struct arccom *ac;
+
+	if_attach(ifp);
+	ifp->if_type = IFT_ARCNET;
+	ifp->if_addrlen = 1;
+	ifp->if_hdrlen = ARC_HDRLEN;
+	ifp->if_mtu = 1500;
+	if (ifp->if_baudrate == 0)
+		ifp->if_baudrate = 2500000;
+#if __FreeBSD_version < 500000
+	ifa = ifnet_addrs[ifp->if_index - 1];
+#else
+	ifa = ifaddr_byindex(ifp->if_index);
+#endif
+	KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
+	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
+	sdl->sdl_type = IFT_ARCNET;
+	sdl->sdl_alen = ifp->if_addrlen;
+
+	if (ifp->if_flags & IFF_BROADCAST)
+		ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
+
+	ac = (struct arccom *)ifp;
+	ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
+	if (lla == 0) {
+		/* XXX this message isn't entirely clear, to me -- cgd */
+		log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts.  Please change it and ifconfig %s%d down up\n",
+		   ifp->if_name, ifp->if_unit, ifp->if_name, ifp->if_unit);
+	}
+	arc_storelladdr(ifp, lla);
+
+	ifp->if_broadcastaddr = &arcbroadcastaddr;
+
+	bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
+}
+
+void
+arc_ifdetach(ifp)
+	struct ifnet *ifp;
+{
+	bpfdetach(ifp);
+	if_detach(ifp);
+}
+
+int
+arc_ioctl(ifp, command, data)
+	struct ifnet *ifp;
+	int command;
+	caddr_t data;
+{
+	struct ifaddr *ifa = (struct ifaddr *) data;
+	struct ifreq *ifr = (struct ifreq *) data;
+	int error = 0;
+
+	switch (command) {
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+		switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+		case AF_INET:
+			ifp->if_init(ifp->if_softc);	/* before arpwhohas */
+			arp_ifinit(ifp, ifa);
+			break;
+#endif
+		default:
+			ifp->if_init(ifp->if_softc);
+			break;
+		}
+		break;
+
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		if (ifr == NULL)
+			error = EAFNOSUPPORT;
+		else {
+			switch (ifr->ifr_addr.sa_family) {
+			case AF_INET:
+			case AF_INET6:
+				error = 0;
+				break;
+			default:
+				error = EAFNOSUPPORT;
+				break;
+			}
+		}
+		break;
+
+	case SIOCSIFMTU:
+		/*
+		 * Set the interface MTU.
+		 * mtu can't be larger than ARCMTU for RFC1051
+		 * and can't be larger than ARC_PHDS_MTU
+		 */
+		if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
+		    ifr->ifr_mtu > ARC_PHDS_MAXMTU)
+			error = EINVAL;
+		else
+			ifp->if_mtu = ifr->ifr_mtu;
+		break;
+
+#if 0
+	case SIOCGIFADDR:
+		{
+			struct sockaddr *sa;
+
+			sa = (struct sockaddr *) & ifr->ifr_data;
+			bcopy(IFP2AC(ifp)->ac_enaddr,
+			      (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
+		}
+		break;
+#endif
+	}
+
+	return (error);
+}