if_iso88025subr.c revision 194581 
174531Sru/*-
274531Sru * Copyright (c) 1998, Larry Lile
3867Sache * All rights reserved.
474815Sru *
5867Sache * For latest sources and information on this driver, please
6867Sache * go to http://anarchy.stdio.com.
7 *
8 * Questions, comments or suggestions should be directed to
9 * Larry Lile <lile@stdio.com>.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice unmodified, this list of conditions, and the following
16 *    disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: head/sys/net/if_iso88025subr.c 194581 2009-06-21 10:29:31Z rdivacky $
34 *
35 */
36
37/*
38 *
39 * General ISO 802.5 (Token Ring) support routines
40 *
41 */
42
43#include "opt_inet.h"
44#include "opt_inet6.h"
45#include "opt_ipx.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/malloc.h>
51#include <sys/mbuf.h>
52#include <sys/module.h>
53#include <sys/socket.h>
54#include <sys/sockio.h>
55
56#include <net/if.h>
57#include <net/if_arp.h>
58#include <net/if_dl.h>
59#include <net/if_llc.h>
60#include <net/if_types.h>
61#include <net/if_llatbl.h>
62
63#include <net/ethernet.h>
64#include <net/netisr.h>
65#include <net/route.h>
66#include <net/bpf.h>
67#include <net/iso88025.h>
68
69#if defined(INET) || defined(INET6)
70#include <netinet/in.h>
71#include <netinet/in_var.h>
72#include <netinet/if_ether.h>
73#endif
74#ifdef INET6
75#include <netinet6/nd6.h>
76#endif
77
78#ifdef IPX
79#include <netipx/ipx.h>
80#include <netipx/ipx_if.h>
81#endif
82
83#include <security/mac/mac_framework.h>
84
85static const u_char iso88025_broadcastaddr[ISO88025_ADDR_LEN] =
86			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
87
88static int iso88025_resolvemulti (struct ifnet *, struct sockaddr **,
89				  struct sockaddr *);
90
91#define	senderr(e)	do { error = (e); goto bad; } while (0)
92
93/*
94 * Perform common duties while attaching to interface list
95 */
96void
97iso88025_ifattach(struct ifnet *ifp, const u_int8_t *lla, int bpf)
98{
99    struct ifaddr *ifa;
100    struct sockaddr_dl *sdl;
101
102    ifa = NULL;
103
104    ifp->if_type = IFT_ISO88025;
105    ifp->if_addrlen = ISO88025_ADDR_LEN;
106    ifp->if_hdrlen = ISO88025_HDR_LEN;
107
108    if_attach(ifp);	/* Must be called before additional assignments */
109
110    ifp->if_output = iso88025_output;
111    ifp->if_input = iso88025_input;
112    ifp->if_resolvemulti = iso88025_resolvemulti;
113    ifp->if_broadcastaddr = iso88025_broadcastaddr;
114
115    if (ifp->if_baudrate == 0)
116        ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
117    if (ifp->if_mtu == 0)
118        ifp->if_mtu = ISO88025_DEFAULT_MTU;
119
120    ifa = ifp->if_addr;
121    KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
122
123    sdl = (struct sockaddr_dl *)ifa->ifa_addr;
124    sdl->sdl_type = IFT_ISO88025;
125    sdl->sdl_alen = ifp->if_addrlen;
126    bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
127
128    if (bpf)
129        bpfattach(ifp, DLT_IEEE802, ISO88025_HDR_LEN);
130
131    return;
132}
133
134/*
135 * Perform common duties while detaching a Token Ring interface
136 */
137void
138iso88025_ifdetach(ifp, bpf)
139        struct ifnet *ifp;
140        int bpf;
141{
142
143	if (bpf)
144                bpfdetach(ifp);
145
146	if_detach(ifp);
147
148	return;
149}
150
151int
152iso88025_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
153{
154        struct ifaddr *ifa;
155        struct ifreq *ifr;
156        int error;
157
158	ifa = (struct ifaddr *) data;
159	ifr = (struct ifreq *) data;
160	error = 0;
161
162        switch (command) {
163        case SIOCSIFADDR:
164                ifp->if_flags |= IFF_UP;
165
166                switch (ifa->ifa_addr->sa_family) {
167#ifdef INET
168                case AF_INET:
169                        ifp->if_init(ifp->if_softc);    /* before arpwhohas */
170                        arp_ifinit(ifp, ifa);
171                        break;
172#endif	/* INET */
173#ifdef IPX
174                /*
175                 * XXX - This code is probably wrong
176                 */
177                case AF_IPX: {
178				struct ipx_addr *ina;
179
180				ina = &(IA_SIPX(ifa)->sipx_addr);
181
182				if (ipx_nullhost(*ina))
183					ina->x_host = *(union ipx_host *)
184							IF_LLADDR(ifp);
185				else
186					bcopy((caddr_t) ina->x_host.c_host,
187					      (caddr_t) IF_LLADDR(ifp),
188					      ISO88025_ADDR_LEN);
189
190				/*
191				 * Set new address
192				 */
193				ifp->if_init(ifp->if_softc);
194			}
195			break;
196#endif	/* IPX */
197                default:
198                        ifp->if_init(ifp->if_softc);
199                        break;
200                }
201                break;
202
203        case SIOCGIFADDR: {
204                        struct sockaddr *sa;
205
206                        sa = (struct sockaddr *) & ifr->ifr_data;
207                        bcopy(IF_LLADDR(ifp),
208                              (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
209                }
210                break;
211
212        case SIOCSIFMTU:
213                /*
214                 * Set the interface MTU.
215                 */
216                if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
217                        error = EINVAL;
218                } else {
219                        ifp->if_mtu = ifr->ifr_mtu;
220                }
221                break;
222	default:
223		error = EINVAL;			/* XXX netbsd has ENOTTY??? */
224		break;
225        }
226
227        return (error);
228}
229
230/*
231 * ISO88025 encapsulation
232 */
233int
234iso88025_output(ifp, m, dst, ro)
235	struct ifnet *ifp;
236	struct mbuf *m;
237	struct sockaddr *dst;
238	struct route *ro;
239{
240	u_int16_t snap_type = 0;
241	int loop_copy = 0, error = 0, rif_len = 0;
242	u_char edst[ISO88025_ADDR_LEN];
243	struct iso88025_header *th;
244	struct iso88025_header gen_th;
245	struct sockaddr_dl *sdl = NULL;
246	struct rtentry *rt0 = NULL;
247#if defined(INET) || defined(INET6)
248	struct llentry *lle;
249#endif
250
251	if (ro != NULL)
252		rt0 = ro->ro_rt;
253
254#ifdef MAC
255	error = mac_ifnet_check_transmit(ifp, m);
256	if (error)
257		senderr(error);
258#endif
259
260	if (ifp->if_flags & IFF_MONITOR)
261		senderr(ENETDOWN);
262	if (!((ifp->if_flags & IFF_UP) &&
263	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
264		senderr(ENETDOWN);
265	getmicrotime(&ifp->if_lastchange);
266
267	/* Calculate routing info length based on arp table entry */
268	/* XXX any better way to do this ? */
269
270	if (rt0 && (sdl = (struct sockaddr_dl *)rt0->rt_gateway))
271		if (SDL_ISO88025(sdl)->trld_rcf != 0)
272			rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
273
274	/* Generate a generic 802.5 header for the packet */
275	gen_th.ac = TR_AC;
276	gen_th.fc = TR_LLC_FRAME;
277	(void)memcpy((caddr_t)gen_th.iso88025_shost, IF_LLADDR(ifp),
278		     ISO88025_ADDR_LEN);
279	if (rif_len) {
280		gen_th.iso88025_shost[0] |= TR_RII;
281		if (rif_len > 2) {
282			gen_th.rcf = SDL_ISO88025(sdl)->trld_rcf;
283			(void)memcpy((caddr_t)gen_th.rd,
284				(caddr_t)SDL_ISO88025(sdl)->trld_route,
285				rif_len - 2);
286		}
287	}
288
289	switch (dst->sa_family) {
290#ifdef INET
291	case AF_INET:
292		error = arpresolve(ifp, rt0, m, dst, edst, &lle);
293		if (error)
294			return (error == EWOULDBLOCK ? 0 : error);
295		snap_type = ETHERTYPE_IP;
296		break;
297	case AF_ARP:
298	{
299		struct arphdr *ah;
300		ah = mtod(m, struct arphdr *);
301		ah->ar_hrd = htons(ARPHRD_IEEE802);
302
303		loop_copy = -1; /* if this is for us, don't do it */
304
305		switch(ntohs(ah->ar_op)) {
306		case ARPOP_REVREQUEST:
307		case ARPOP_REVREPLY:
308			snap_type = ETHERTYPE_REVARP;
309			break;
310		case ARPOP_REQUEST:
311		case ARPOP_REPLY:
312		default:
313			snap_type = ETHERTYPE_ARP;
314			break;
315		}
316
317		if (m->m_flags & M_BCAST)
318			bcopy(ifp->if_broadcastaddr, edst, ISO88025_ADDR_LEN);
319		else
320			bcopy(ar_tha(ah), edst, ISO88025_ADDR_LEN);
321
322	}
323	break;
324#endif	/* INET */
325#ifdef INET6
326	case AF_INET6:
327		error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
328		if (error)
329			return (error);
330		snap_type = ETHERTYPE_IPV6;
331		break;
332#endif	/* INET6 */
333#ifdef IPX
334	case AF_IPX:
335	{
336		u_int8_t	*cp;
337
338		bcopy((caddr_t)&(satoipx_addr(dst).x_host), (caddr_t)edst,
339		      ISO88025_ADDR_LEN);
340
341		M_PREPEND(m, 3, M_WAIT);
342		m = m_pullup(m, 3);
343		if (m == 0)
344			senderr(ENOBUFS);
345		cp = mtod(m, u_int8_t *);
346		*cp++ = ETHERTYPE_IPX_8022;
347		*cp++ = ETHERTYPE_IPX_8022;
348		*cp++ = LLC_UI;
349	}
350	break;
351#endif	/* IPX */
352	case AF_UNSPEC:
353	{
354		struct iso88025_sockaddr_data *sd;
355		/*
356		 * For AF_UNSPEC sockaddr.sa_data must contain all of the
357		 * mac information needed to send the packet.  This allows
358		 * full mac, llc, and source routing function to be controlled.
359		 * llc and source routing information must already be in the
360		 * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
361		 * should be an iso88025_sockaddr_data structure see iso88025.h
362		 */
363                loop_copy = -1;
364		sd = (struct iso88025_sockaddr_data *)dst->sa_data;
365		gen_th.ac = sd->ac;
366		gen_th.fc = sd->fc;
367		(void)memcpy((caddr_t)edst, (caddr_t)sd->ether_dhost,
368			     ISO88025_ADDR_LEN);
369		(void)memcpy((caddr_t)gen_th.iso88025_shost,
370			     (caddr_t)sd->ether_shost, ISO88025_ADDR_LEN);
371		rif_len = 0;
372		break;
373	}
374	default:
375		if_printf(ifp, "can't handle af%d\n", dst->sa_family);
376		senderr(EAFNOSUPPORT);
377		break;
378	}
379
380	/*
381	 * Add LLC header.
382	 */
383	if (snap_type != 0) {
384        	struct llc *l;
385		M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
386		if (m == 0)
387			senderr(ENOBUFS);
388		l = mtod(m, struct llc *);
389		l->llc_control = LLC_UI;
390		l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
391		l->llc_snap.org_code[0] =
392			l->llc_snap.org_code[1] =
393			l->llc_snap.org_code[2] = 0;
394		l->llc_snap.ether_type = htons(snap_type);
395	}
396
397	/*
398	 * Add local net header.  If no space in first mbuf,
399	 * allocate another.
400	 */
401	M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
402	if (m == 0)
403		senderr(ENOBUFS);
404	th = mtod(m, struct iso88025_header *);
405	bcopy((caddr_t)edst, (caddr_t)&gen_th.iso88025_dhost, ISO88025_ADDR_LEN);
406
407	/* Copy as much of the generic header as is needed into the mbuf */
408	memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
409
410        /*
411         * If a simplex interface, and the packet is being sent to our
412         * Ethernet address or a broadcast address, loopback a copy.
413         * XXX To make a simplex device behave exactly like a duplex
414         * device, we should copy in the case of sending to our own
415         * ethernet address (thus letting the original actually appear
416         * on the wire). However, we don't do that here for security
417         * reasons and compatibility with the original behavior.
418         */
419        if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
420                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
421                        struct mbuf *n;
422			n = m_copy(m, 0, (int)M_COPYALL);
423                        (void) if_simloop(ifp, n, dst->sa_family,
424					  ISO88025_HDR_LEN);
425                } else if (bcmp(th->iso88025_dhost, th->iso88025_shost,
426				 ETHER_ADDR_LEN) == 0) {
427			(void) if_simloop(ifp, m, dst->sa_family,
428					  ISO88025_HDR_LEN);
429                       	return(0);      /* XXX */
430		}
431        }
432
433	IFQ_HANDOFF_ADJ(ifp, m, ISO88025_HDR_LEN + LLC_SNAPFRAMELEN, error);
434	if (error) {
435		printf("iso88025_output: packet dropped QFULL.\n");
436		ifp->if_oerrors++;
437	}
438	return (error);
439
440bad:
441	ifp->if_oerrors++;
442	if (m)
443		m_freem(m);
444	return (error);
445}
446
447/*
448 * ISO 88025 de-encapsulation
449 */
450void
451iso88025_input(ifp, m)
452	struct ifnet *ifp;
453	struct mbuf *m;
454{
455	struct iso88025_header *th;
456	struct llc *l;
457	int isr;
458	int mac_hdr_len;
459
460	/*
461	 * Do consistency checks to verify assumptions
462	 * made by code past this point.
463	 */
464	if ((m->m_flags & M_PKTHDR) == 0) {
465		if_printf(ifp, "discard frame w/o packet header\n");
466		ifp->if_ierrors++;
467		m_freem(m);
468		return;
469	}
470	if (m->m_pkthdr.rcvif == NULL) {
471		if_printf(ifp, "discard frame w/o interface pointer\n");
472		ifp->if_ierrors++;
473 		m_freem(m);
474		return;
475	}
476
477	m = m_pullup(m, ISO88025_HDR_LEN);
478	if (m == NULL) {
479		ifp->if_ierrors++;
480		goto dropanyway;
481	}
482	th = mtod(m, struct iso88025_header *);
483	m->m_pkthdr.header = (void *)th;
484
485	/*
486	 * Discard packet if interface is not up.
487	 */
488	if (!((ifp->if_flags & IFF_UP) &&
489	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
490		goto dropanyway;
491
492	/*
493	 * Give bpf a chance at the packet.
494	 */
495	BPF_MTAP(ifp, m);
496
497	/*
498	 * Interface marked for monitoring; discard packet.
499	 */
500	if (ifp->if_flags & IFF_MONITOR) {
501		m_freem(m);
502		return;
503	}
504
505#ifdef MAC
506	mac_ifnet_create_mbuf(ifp, m);
507#endif
508
509	/*
510	 * Update interface statistics.
511	 */
512	ifp->if_ibytes += m->m_pkthdr.len;
513	getmicrotime(&ifp->if_lastchange);
514
515	/*
516	 * Discard non local unicast packets when interface
517	 * is in promiscuous mode.
518	 */
519	if ((ifp->if_flags & IFF_PROMISC) &&
520	    ((th->iso88025_dhost[0] & 1) == 0) &&
521	     (bcmp(IF_LLADDR(ifp), (caddr_t) th->iso88025_dhost,
522	     ISO88025_ADDR_LEN) != 0))
523		goto dropanyway;
524
525	/*
526	 * Set mbuf flags for bcast/mcast.
527	 */
528	if (th->iso88025_dhost[0] & 1) {
529		if (bcmp(iso88025_broadcastaddr, th->iso88025_dhost,
530		    ISO88025_ADDR_LEN) == 0)
531			m->m_flags |= M_BCAST;
532		else
533			m->m_flags |= M_MCAST;
534		ifp->if_imcasts++;
535	}
536
537	mac_hdr_len = ISO88025_HDR_LEN;
538	/* Check for source routing info */
539	if (th->iso88025_shost[0] & TR_RII)
540		mac_hdr_len += TR_RCF_RIFLEN(th->rcf);
541
542	/* Strip off ISO88025 header. */
543	m_adj(m, mac_hdr_len);
544
545	m = m_pullup(m, LLC_SNAPFRAMELEN);
546	if (m == 0) {
547		ifp->if_ierrors++;
548		goto dropanyway;
549	}
550	l = mtod(m, struct llc *);
551
552	switch (l->llc_dsap) {
553#ifdef IPX
554	case ETHERTYPE_IPX_8022:	/* Thanks a bunch Novell */
555		if ((l->llc_control != LLC_UI) ||
556		    (l->llc_ssap != ETHERTYPE_IPX_8022)) {
557			ifp->if_noproto++;
558			goto dropanyway;
559		}
560
561		th->iso88025_shost[0] &= ~(TR_RII);
562		m_adj(m, 3);
563		isr = NETISR_IPX;
564		break;
565#endif	/* IPX */
566	case LLC_SNAP_LSAP: {
567		u_int16_t type;
568		if ((l->llc_control != LLC_UI) ||
569		    (l->llc_ssap != LLC_SNAP_LSAP)) {
570			ifp->if_noproto++;
571			goto dropanyway;
572		}
573
574		if (l->llc_snap.org_code[0] != 0 ||
575		    l->llc_snap.org_code[1] != 0 ||
576		    l->llc_snap.org_code[2] != 0) {
577			ifp->if_noproto++;
578			goto dropanyway;
579		}
580
581		type = ntohs(l->llc_snap.ether_type);
582		m_adj(m, LLC_SNAPFRAMELEN);
583		switch (type) {
584#ifdef INET
585		case ETHERTYPE_IP:
586			th->iso88025_shost[0] &= ~(TR_RII);
587			if ((m = ip_fastforward(m)) == NULL)
588				return;
589			isr = NETISR_IP;
590			break;
591
592		case ETHERTYPE_ARP:
593			if (ifp->if_flags & IFF_NOARP)
594				goto dropanyway;
595			isr = NETISR_ARP;
596			break;
597#endif	/* INET */
598#ifdef IPX_SNAP	/* XXX: Not supported! */
599		case ETHERTYPE_IPX:
600			th->iso88025_shost[0] &= ~(TR_RII);
601			isr = NETISR_IPX;
602			break;
603#endif	/* IPX_SNAP */
604#ifdef INET6
605		case ETHERTYPE_IPV6:
606			th->iso88025_shost[0] &= ~(TR_RII);
607			isr = NETISR_IPV6;
608			break;
609#endif	/* INET6 */
610		default:
611			printf("iso88025_input: unexpected llc_snap ether_type  0x%02x\n", type);
612			ifp->if_noproto++;
613			goto dropanyway;
614		}
615		break;
616	}
617#ifdef ISO
618	case LLC_ISO_LSAP:
619		switch (l->llc_control) {
620		case LLC_UI:
621			ifp->if_noproto++;
622			goto dropanyway;
623			break;
624                case LLC_XID:
625                case LLC_XID_P:
626			if(m->m_len < ISO88025_ADDR_LEN)
627				goto dropanyway;
628			l->llc_window = 0;
629			l->llc_fid = 9;
630			l->llc_class = 1;
631			l->llc_dsap = l->llc_ssap = 0;
632			/* Fall through to */
633		case LLC_TEST:
634		case LLC_TEST_P:
635		{
636			struct sockaddr sa;
637			struct arpcom *ac;
638			struct iso88025_sockaddr_data *th2;
639			int i;
640			u_char c;
641
642			c = l->llc_dsap;
643
644			if (th->iso88025_shost[0] & TR_RII) { /* XXX */
645				printf("iso88025_input: dropping source routed LLC_TEST\n");
646				goto dropanyway;
647			}
648			l->llc_dsap = l->llc_ssap;
649			l->llc_ssap = c;
650			if (m->m_flags & (M_BCAST | M_MCAST))
651				bcopy((caddr_t)IF_LLADDR(ifp),
652				      (caddr_t)th->iso88025_dhost,
653					ISO88025_ADDR_LEN);
654			sa.sa_family = AF_UNSPEC;
655			sa.sa_len = sizeof(sa);
656			th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
657			for (i = 0; i < ISO88025_ADDR_LEN; i++) {
658				th2->ether_shost[i] = c = th->iso88025_dhost[i];
659				th2->ether_dhost[i] = th->iso88025_dhost[i] =
660					th->iso88025_shost[i];
661				th->iso88025_shost[i] = c;
662			}
663			th2->ac = TR_AC;
664			th2->fc = TR_LLC_FRAME;
665			ifp->if_output(ifp, m, &sa, NULL);
666			return;
667		}
668		default:
669			printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
670			ifp->if_noproto++;
671			goto dropanyway;
672			break;
673		}
674		break;
675#endif	/* ISO */
676	default:
677		printf("iso88025_input: unknown dsap 0x%x\n", l->llc_dsap);
678		ifp->if_noproto++;
679		goto dropanyway;
680		break;
681	}
682
683	netisr_dispatch(isr, m);
684	return;
685
686dropanyway:
687	ifp->if_iqdrops++;
688	if (m)
689		m_freem(m);
690	return;
691}
692
693static int
694iso88025_resolvemulti (ifp, llsa, sa)
695	struct ifnet *ifp;
696	struct sockaddr **llsa;
697	struct sockaddr *sa;
698{
699	struct sockaddr_dl *sdl;
700#ifdef INET
701	struct sockaddr_in *sin;
702#endif
703#ifdef INET6
704	struct sockaddr_in6 *sin6;
705#endif
706	u_char *e_addr;
707
708	switch(sa->sa_family) {
709	case AF_LINK:
710		/*
711		 * No mapping needed. Just check that it's a valid MC address.
712		 */
713		sdl = (struct sockaddr_dl *)sa;
714		e_addr = LLADDR(sdl);
715		if ((e_addr[0] & 1) != 1) {
716			return (EADDRNOTAVAIL);
717		}
718		*llsa = 0;
719		return (0);
720
721#ifdef INET
722	case AF_INET:
723		sin = (struct sockaddr_in *)sa;
724		if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
725			return (EADDRNOTAVAIL);
726		}
727		sdl = malloc(sizeof *sdl, M_IFMADDR,
728		       M_NOWAIT|M_ZERO);
729		if (sdl == NULL)
730			return (ENOMEM);
731		sdl->sdl_len = sizeof *sdl;
732		sdl->sdl_family = AF_LINK;
733		sdl->sdl_index = ifp->if_index;
734		sdl->sdl_type = IFT_ISO88025;
735		sdl->sdl_alen = ISO88025_ADDR_LEN;
736		e_addr = LLADDR(sdl);
737		ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
738		*llsa = (struct sockaddr *)sdl;
739		return (0);
740#endif
741#ifdef INET6
742	case AF_INET6:
743		sin6 = (struct sockaddr_in6 *)sa;
744		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
745			/*
746			 * An IP6 address of 0 means listen to all
747			 * of the Ethernet multicast address used for IP6.
748			 * (This is used for multicast routers.)
749			 */
750			ifp->if_flags |= IFF_ALLMULTI;
751			*llsa = 0;
752			return (0);
753		}
754		if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
755			return (EADDRNOTAVAIL);
756		}
757		sdl = malloc(sizeof *sdl, M_IFMADDR,
758		       M_NOWAIT|M_ZERO);
759		if (sdl == NULL)
760			return (ENOMEM);
761		sdl->sdl_len = sizeof *sdl;
762		sdl->sdl_family = AF_LINK;
763		sdl->sdl_index = ifp->if_index;
764		sdl->sdl_type = IFT_ISO88025;
765		sdl->sdl_alen = ISO88025_ADDR_LEN;
766		e_addr = LLADDR(sdl);
767		ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
768		*llsa = (struct sockaddr *)sdl;
769		return (0);
770#endif
771
772	default:
773		/*
774		 * Well, the text isn't quite right, but it's the name
775		 * that counts...
776		 */
777		return (EAFNOSUPPORT);
778	}
779
780	return (0);
781}
782
783MALLOC_DEFINE(M_ISO88025, "arpcom", "802.5 interface internals");
784
785static void*
786iso88025_alloc(u_char type, struct ifnet *ifp)
787{
788	struct arpcom	*ac;
789
790        ac = malloc(sizeof(struct arpcom), M_ISO88025, M_WAITOK | M_ZERO);
791	ac->ac_ifp = ifp;
792
793	return (ac);
794}
795
796static void
797iso88025_free(void *com, u_char type)
798{
799
800        free(com, M_ISO88025);
801}
802
803static int
804iso88025_modevent(module_t mod, int type, void *data)
805{
806
807        switch (type) {
808        case MOD_LOAD:
809                if_register_com_alloc(IFT_ISO88025, iso88025_alloc,
810                    iso88025_free);
811                break;
812        case MOD_UNLOAD:
813                if_deregister_com_alloc(IFT_ISO88025);
814                break;
815        default:
816                return EOPNOTSUPP;
817        }
818
819        return (0);
820}
821
822static moduledata_t iso88025_mod = {
823	"iso88025",
824	iso88025_modevent,
825	0
826};
827
828DECLARE_MODULE(iso88025, iso88025_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
829MODULE_VERSION(iso88025, 1);
830