if_iso88025subr.c revision 249925 
1/*-
2 * Copyright (c) 1998, Larry Lile
3 * All rights reserved.
4 *
5 * For latest sources and information on this driver, please
6 * 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 249925 2013-04-26 12:50:32Z glebius $
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(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
235	struct route *ro)
236{
237	u_int16_t snap_type = 0;
238	int loop_copy = 0, error = 0, rif_len = 0;
239	u_char edst[ISO88025_ADDR_LEN];
240	struct iso88025_header *th;
241	struct iso88025_header gen_th;
242	struct sockaddr_dl *sdl = NULL;
243	struct rtentry *rt0 = NULL;
244#if defined(INET) || defined(INET6)
245	struct llentry *lle;
246#endif
247
248	if (ro != NULL)
249		rt0 = ro->ro_rt;
250
251#ifdef MAC
252	error = mac_ifnet_check_transmit(ifp, m);
253	if (error)
254		senderr(error);
255#endif
256
257	if (ifp->if_flags & IFF_MONITOR)
258		senderr(ENETDOWN);
259	if (!((ifp->if_flags & IFF_UP) &&
260	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
261		senderr(ENETDOWN);
262	getmicrotime(&ifp->if_lastchange);
263
264	/* Calculate routing info length based on arp table entry */
265	/* XXX any better way to do this ? */
266
267	if (rt0 && (sdl = (struct sockaddr_dl *)rt0->rt_gateway))
268		if (SDL_ISO88025(sdl)->trld_rcf != 0)
269			rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
270
271	/* Generate a generic 802.5 header for the packet */
272	gen_th.ac = TR_AC;
273	gen_th.fc = TR_LLC_FRAME;
274	(void)memcpy((caddr_t)gen_th.iso88025_shost, IF_LLADDR(ifp),
275		     ISO88025_ADDR_LEN);
276	if (rif_len) {
277		gen_th.iso88025_shost[0] |= TR_RII;
278		if (rif_len > 2) {
279			gen_th.rcf = SDL_ISO88025(sdl)->trld_rcf;
280			(void)memcpy((caddr_t)gen_th.rd,
281				(caddr_t)SDL_ISO88025(sdl)->trld_route,
282				rif_len - 2);
283		}
284	}
285
286	switch (dst->sa_family) {
287#ifdef INET
288	case AF_INET:
289		error = arpresolve(ifp, rt0, m, dst, edst, &lle);
290		if (error)
291			return (error == EWOULDBLOCK ? 0 : error);
292		snap_type = ETHERTYPE_IP;
293		break;
294	case AF_ARP:
295	{
296		struct arphdr *ah;
297		ah = mtod(m, struct arphdr *);
298		ah->ar_hrd = htons(ARPHRD_IEEE802);
299
300		loop_copy = -1; /* if this is for us, don't do it */
301
302		switch(ntohs(ah->ar_op)) {
303		case ARPOP_REVREQUEST:
304		case ARPOP_REVREPLY:
305			snap_type = ETHERTYPE_REVARP;
306			break;
307		case ARPOP_REQUEST:
308		case ARPOP_REPLY:
309		default:
310			snap_type = ETHERTYPE_ARP;
311			break;
312		}
313
314		if (m->m_flags & M_BCAST)
315			bcopy(ifp->if_broadcastaddr, edst, ISO88025_ADDR_LEN);
316		else
317			bcopy(ar_tha(ah), edst, ISO88025_ADDR_LEN);
318
319	}
320	break;
321#endif	/* INET */
322#ifdef INET6
323	case AF_INET6:
324		error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
325		if (error)
326			return (error);
327		snap_type = ETHERTYPE_IPV6;
328		break;
329#endif	/* INET6 */
330#ifdef IPX
331	case AF_IPX:
332	{
333		u_int8_t	*cp;
334
335		bcopy((caddr_t)&(satoipx_addr(dst).x_host), (caddr_t)edst,
336		      ISO88025_ADDR_LEN);
337
338		M_PREPEND(m, 3, M_WAITOK);
339		m = m_pullup(m, 3);
340		if (m == 0)
341			senderr(ENOBUFS);
342		cp = mtod(m, u_int8_t *);
343		*cp++ = ETHERTYPE_IPX_8022;
344		*cp++ = ETHERTYPE_IPX_8022;
345		*cp++ = LLC_UI;
346	}
347	break;
348#endif	/* IPX */
349	case AF_UNSPEC:
350	{
351		const struct iso88025_sockaddr_data *sd;
352		/*
353		 * For AF_UNSPEC sockaddr.sa_data must contain all of the
354		 * mac information needed to send the packet.  This allows
355		 * full mac, llc, and source routing function to be controlled.
356		 * llc and source routing information must already be in the
357		 * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
358		 * should be an iso88025_sockaddr_data structure see iso88025.h
359		 */
360                loop_copy = -1;
361		sd = (const struct iso88025_sockaddr_data *)dst->sa_data;
362		gen_th.ac = sd->ac;
363		gen_th.fc = sd->fc;
364		(void)memcpy(edst, sd->ether_dhost, ISO88025_ADDR_LEN);
365		(void)memcpy(gen_th.iso88025_shost, sd->ether_shost,
366		    ISO88025_ADDR_LEN);
367		rif_len = 0;
368		break;
369	}
370	default:
371		if_printf(ifp, "can't handle af%d\n", dst->sa_family);
372		senderr(EAFNOSUPPORT);
373		break;
374	}
375
376	/*
377	 * Add LLC header.
378	 */
379	if (snap_type != 0) {
380        	struct llc *l;
381		M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
382		if (m == 0)
383			senderr(ENOBUFS);
384		l = mtod(m, struct llc *);
385		l->llc_control = LLC_UI;
386		l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
387		l->llc_snap.org_code[0] =
388			l->llc_snap.org_code[1] =
389			l->llc_snap.org_code[2] = 0;
390		l->llc_snap.ether_type = htons(snap_type);
391	}
392
393	/*
394	 * Add local net header.  If no space in first mbuf,
395	 * allocate another.
396	 */
397	M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_NOWAIT);
398	if (m == 0)
399		senderr(ENOBUFS);
400	th = mtod(m, struct iso88025_header *);
401	bcopy((caddr_t)edst, (caddr_t)&gen_th.iso88025_dhost, ISO88025_ADDR_LEN);
402
403	/* Copy as much of the generic header as is needed into the mbuf */
404	memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
405
406        /*
407         * If a simplex interface, and the packet is being sent to our
408         * Ethernet address or a broadcast address, loopback a copy.
409         * XXX To make a simplex device behave exactly like a duplex
410         * device, we should copy in the case of sending to our own
411         * ethernet address (thus letting the original actually appear
412         * on the wire). However, we don't do that here for security
413         * reasons and compatibility with the original behavior.
414         */
415        if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
416                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
417                        struct mbuf *n;
418			n = m_copy(m, 0, (int)M_COPYALL);
419                        (void) if_simloop(ifp, n, dst->sa_family,
420					  ISO88025_HDR_LEN);
421                } else if (bcmp(th->iso88025_dhost, th->iso88025_shost,
422				 ETHER_ADDR_LEN) == 0) {
423			(void) if_simloop(ifp, m, dst->sa_family,
424					  ISO88025_HDR_LEN);
425                       	return(0);      /* XXX */
426		}
427        }
428
429	IFQ_HANDOFF_ADJ(ifp, m, ISO88025_HDR_LEN + LLC_SNAPFRAMELEN, error);
430	if (error) {
431		printf("iso88025_output: packet dropped QFULL.\n");
432		ifp->if_oerrors++;
433	}
434	return (error);
435
436bad:
437	ifp->if_oerrors++;
438	if (m)
439		m_freem(m);
440	return (error);
441}
442
443/*
444 * ISO 88025 de-encapsulation
445 */
446void
447iso88025_input(ifp, m)
448	struct ifnet *ifp;
449	struct mbuf *m;
450{
451	struct iso88025_header *th;
452	struct llc *l;
453	int isr;
454	int mac_hdr_len;
455
456	/*
457	 * Do consistency checks to verify assumptions
458	 * made by code past this point.
459	 */
460	if ((m->m_flags & M_PKTHDR) == 0) {
461		if_printf(ifp, "discard frame w/o packet header\n");
462		ifp->if_ierrors++;
463		m_freem(m);
464		return;
465	}
466	if (m->m_pkthdr.rcvif == NULL) {
467		if_printf(ifp, "discard frame w/o interface pointer\n");
468		ifp->if_ierrors++;
469 		m_freem(m);
470		return;
471	}
472
473	m = m_pullup(m, ISO88025_HDR_LEN);
474	if (m == NULL) {
475		ifp->if_ierrors++;
476		goto dropanyway;
477	}
478	th = mtod(m, struct iso88025_header *);
479	m->m_pkthdr.header = (void *)th;
480
481	/*
482	 * Discard packet if interface is not up.
483	 */
484	if (!((ifp->if_flags & IFF_UP) &&
485	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
486		goto dropanyway;
487
488	/*
489	 * Give bpf a chance at the packet.
490	 */
491	BPF_MTAP(ifp, m);
492
493	/*
494	 * Interface marked for monitoring; discard packet.
495	 */
496	if (ifp->if_flags & IFF_MONITOR) {
497		m_freem(m);
498		return;
499	}
500
501#ifdef MAC
502	mac_ifnet_create_mbuf(ifp, m);
503#endif
504
505	/*
506	 * Update interface statistics.
507	 */
508	ifp->if_ibytes += m->m_pkthdr.len;
509	getmicrotime(&ifp->if_lastchange);
510
511	/*
512	 * Discard non local unicast packets when interface
513	 * is in promiscuous mode.
514	 */
515	if ((ifp->if_flags & IFF_PROMISC) &&
516	    ((th->iso88025_dhost[0] & 1) == 0) &&
517	     (bcmp(IF_LLADDR(ifp), (caddr_t) th->iso88025_dhost,
518	     ISO88025_ADDR_LEN) != 0))
519		goto dropanyway;
520
521	/*
522	 * Set mbuf flags for bcast/mcast.
523	 */
524	if (th->iso88025_dhost[0] & 1) {
525		if (bcmp(iso88025_broadcastaddr, th->iso88025_dhost,
526		    ISO88025_ADDR_LEN) == 0)
527			m->m_flags |= M_BCAST;
528		else
529			m->m_flags |= M_MCAST;
530		ifp->if_imcasts++;
531	}
532
533	mac_hdr_len = ISO88025_HDR_LEN;
534	/* Check for source routing info */
535	if (th->iso88025_shost[0] & TR_RII)
536		mac_hdr_len += TR_RCF_RIFLEN(th->rcf);
537
538	/* Strip off ISO88025 header. */
539	m_adj(m, mac_hdr_len);
540
541	m = m_pullup(m, LLC_SNAPFRAMELEN);
542	if (m == 0) {
543		ifp->if_ierrors++;
544		goto dropanyway;
545	}
546	l = mtod(m, struct llc *);
547
548	switch (l->llc_dsap) {
549#ifdef IPX
550	case ETHERTYPE_IPX_8022:	/* Thanks a bunch Novell */
551		if ((l->llc_control != LLC_UI) ||
552		    (l->llc_ssap != ETHERTYPE_IPX_8022)) {
553			ifp->if_noproto++;
554			goto dropanyway;
555		}
556
557		th->iso88025_shost[0] &= ~(TR_RII);
558		m_adj(m, 3);
559		isr = NETISR_IPX;
560		break;
561#endif	/* IPX */
562	case LLC_SNAP_LSAP: {
563		u_int16_t type;
564		if ((l->llc_control != LLC_UI) ||
565		    (l->llc_ssap != LLC_SNAP_LSAP)) {
566			ifp->if_noproto++;
567			goto dropanyway;
568		}
569
570		if (l->llc_snap.org_code[0] != 0 ||
571		    l->llc_snap.org_code[1] != 0 ||
572		    l->llc_snap.org_code[2] != 0) {
573			ifp->if_noproto++;
574			goto dropanyway;
575		}
576
577		type = ntohs(l->llc_snap.ether_type);
578		m_adj(m, LLC_SNAPFRAMELEN);
579		switch (type) {
580#ifdef INET
581		case ETHERTYPE_IP:
582			th->iso88025_shost[0] &= ~(TR_RII);
583			if ((m = ip_fastforward(m)) == NULL)
584				return;
585			isr = NETISR_IP;
586			break;
587
588		case ETHERTYPE_ARP:
589			if (ifp->if_flags & IFF_NOARP)
590				goto dropanyway;
591			isr = NETISR_ARP;
592			break;
593#endif	/* INET */
594#ifdef IPX_SNAP	/* XXX: Not supported! */
595		case ETHERTYPE_IPX:
596			th->iso88025_shost[0] &= ~(TR_RII);
597			isr = NETISR_IPX;
598			break;
599#endif	/* IPX_SNAP */
600#ifdef INET6
601		case ETHERTYPE_IPV6:
602			th->iso88025_shost[0] &= ~(TR_RII);
603			isr = NETISR_IPV6;
604			break;
605#endif	/* INET6 */
606		default:
607			printf("iso88025_input: unexpected llc_snap ether_type  0x%02x\n", type);
608			ifp->if_noproto++;
609			goto dropanyway;
610		}
611		break;
612	}
613#ifdef ISO
614	case LLC_ISO_LSAP:
615		switch (l->llc_control) {
616		case LLC_UI:
617			ifp->if_noproto++;
618			goto dropanyway;
619			break;
620                case LLC_XID:
621                case LLC_XID_P:
622			if(m->m_len < ISO88025_ADDR_LEN)
623				goto dropanyway;
624			l->llc_window = 0;
625			l->llc_fid = 9;
626			l->llc_class = 1;
627			l->llc_dsap = l->llc_ssap = 0;
628			/* Fall through to */
629		case LLC_TEST:
630		case LLC_TEST_P:
631		{
632			struct sockaddr sa;
633			struct arpcom *ac;
634			struct iso88025_sockaddr_data *th2;
635			int i;
636			u_char c;
637
638			c = l->llc_dsap;
639
640			if (th->iso88025_shost[0] & TR_RII) { /* XXX */
641				printf("iso88025_input: dropping source routed LLC_TEST\n");
642				goto dropanyway;
643			}
644			l->llc_dsap = l->llc_ssap;
645			l->llc_ssap = c;
646			if (m->m_flags & (M_BCAST | M_MCAST))
647				bcopy((caddr_t)IF_LLADDR(ifp),
648				      (caddr_t)th->iso88025_dhost,
649					ISO88025_ADDR_LEN);
650			sa.sa_family = AF_UNSPEC;
651			sa.sa_len = sizeof(sa);
652			th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
653			for (i = 0; i < ISO88025_ADDR_LEN; i++) {
654				th2->ether_shost[i] = c = th->iso88025_dhost[i];
655				th2->ether_dhost[i] = th->iso88025_dhost[i] =
656					th->iso88025_shost[i];
657				th->iso88025_shost[i] = c;
658			}
659			th2->ac = TR_AC;
660			th2->fc = TR_LLC_FRAME;
661			ifp->if_output(ifp, m, &sa, NULL);
662			return;
663		}
664		default:
665			printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
666			ifp->if_noproto++;
667			goto dropanyway;
668			break;
669		}
670		break;
671#endif	/* ISO */
672	default:
673		printf("iso88025_input: unknown dsap 0x%x\n", l->llc_dsap);
674		ifp->if_noproto++;
675		goto dropanyway;
676		break;
677	}
678
679	M_SETFIB(m, ifp->if_fib);
680	netisr_dispatch(isr, m);
681	return;
682
683dropanyway:
684	ifp->if_iqdrops++;
685	if (m)
686		m_freem(m);
687	return;
688}
689
690static int
691iso88025_resolvemulti (ifp, llsa, sa)
692	struct ifnet *ifp;
693	struct sockaddr **llsa;
694	struct sockaddr *sa;
695{
696	struct sockaddr_dl *sdl;
697#ifdef INET
698	struct sockaddr_in *sin;
699#endif
700#ifdef INET6
701	struct sockaddr_in6 *sin6;
702#endif
703	u_char *e_addr;
704
705	switch(sa->sa_family) {
706	case AF_LINK:
707		/*
708		 * No mapping needed. Just check that it's a valid MC address.
709		 */
710		sdl = (struct sockaddr_dl *)sa;
711		e_addr = LLADDR(sdl);
712		if ((e_addr[0] & 1) != 1) {
713			return (EADDRNOTAVAIL);
714		}
715		*llsa = 0;
716		return (0);
717
718#ifdef INET
719	case AF_INET:
720		sin = (struct sockaddr_in *)sa;
721		if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
722			return (EADDRNOTAVAIL);
723		}
724		sdl = malloc(sizeof *sdl, M_IFMADDR,
725		       M_NOWAIT|M_ZERO);
726		if (sdl == NULL)
727			return (ENOMEM);
728		sdl->sdl_len = sizeof *sdl;
729		sdl->sdl_family = AF_LINK;
730		sdl->sdl_index = ifp->if_index;
731		sdl->sdl_type = IFT_ISO88025;
732		sdl->sdl_alen = ISO88025_ADDR_LEN;
733		e_addr = LLADDR(sdl);
734		ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
735		*llsa = (struct sockaddr *)sdl;
736		return (0);
737#endif
738#ifdef INET6
739	case AF_INET6:
740		sin6 = (struct sockaddr_in6 *)sa;
741		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
742			/*
743			 * An IP6 address of 0 means listen to all
744			 * of the Ethernet multicast address used for IP6.
745			 * (This is used for multicast routers.)
746			 */
747			ifp->if_flags |= IFF_ALLMULTI;
748			*llsa = 0;
749			return (0);
750		}
751		if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
752			return (EADDRNOTAVAIL);
753		}
754		sdl = malloc(sizeof *sdl, M_IFMADDR,
755		       M_NOWAIT|M_ZERO);
756		if (sdl == NULL)
757			return (ENOMEM);
758		sdl->sdl_len = sizeof *sdl;
759		sdl->sdl_family = AF_LINK;
760		sdl->sdl_index = ifp->if_index;
761		sdl->sdl_type = IFT_ISO88025;
762		sdl->sdl_alen = ISO88025_ADDR_LEN;
763		e_addr = LLADDR(sdl);
764		ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
765		*llsa = (struct sockaddr *)sdl;
766		return (0);
767#endif
768
769	default:
770		/*
771		 * Well, the text isn't quite right, but it's the name
772		 * that counts...
773		 */
774		return (EAFNOSUPPORT);
775	}
776
777	return (0);
778}
779
780static MALLOC_DEFINE(M_ISO88025, "arpcom", "802.5 interface internals");
781
782static void*
783iso88025_alloc(u_char type, struct ifnet *ifp)
784{
785	struct arpcom	*ac;
786
787        ac = malloc(sizeof(struct arpcom), M_ISO88025, M_WAITOK | M_ZERO);
788	ac->ac_ifp = ifp;
789
790	return (ac);
791}
792
793static void
794iso88025_free(void *com, u_char type)
795{
796
797        free(com, M_ISO88025);
798}
799
800static int
801iso88025_modevent(module_t mod, int type, void *data)
802{
803
804        switch (type) {
805        case MOD_LOAD:
806                if_register_com_alloc(IFT_ISO88025, iso88025_alloc,
807                    iso88025_free);
808                break;
809        case MOD_UNLOAD:
810                if_deregister_com_alloc(IFT_ISO88025);
811                break;
812        default:
813                return EOPNOTSUPP;
814        }
815
816        return (0);
817}
818
819static moduledata_t iso88025_mod = {
820	"iso88025",
821	iso88025_modevent,
822	0
823};
824
825DECLARE_MODULE(iso88025, iso88025_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
826MODULE_VERSION(iso88025, 1);
827