1 /* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */
2 /* $FreeBSD: src/sys/net/if_arcsubr.c,v 1.1.2.5 2003/02/05 18:42:15 fjoe Exp $ */
3 /* $DragonFly: src/sys/net/Attic/if_arcsubr.c,v 1.19 2005/11/28 17:13:45 dillon Exp $ */
6 * Copyright (c) 1994, 1995 Ignatios Souvatzis
7 * Copyright (c) 1982, 1989, 1993
8 * The Regents of the University of California. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
39 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
43 #include "opt_inet6.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
51 #include <sys/protosw.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/errno.h>
55 #include <sys/syslog.h>
56 #include <sys/serialize.h>
58 #include <machine/cpu.h>
61 #include <net/netisr.h>
62 #include <net/route.h>
63 #include <net/if_dl.h>
64 #include <net/if_types.h>
65 #include <net/if_arc.h>
66 #include <net/if_arp.h>
67 #include <net/ifq_var.h>
70 #if defined(INET) || defined(INET6)
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73 #include <netinet/if_ether.h>
77 #include <netinet6/nd6.h>
81 #include <netproto/ipx/ipx.h>
82 #include <netproto/ipx/ipx_if.h>
85 MODULE_VERSION(arcnet, 1);
87 #define ARCNET_ALLOW_BROKEN_ARP
89 static struct mbuf *arc_defrag (struct ifnet *, struct mbuf *);
90 static int arc_resolvemulti (struct ifnet *, struct sockaddr **,
92 static void arc_input(struct ifnet *, struct mbuf *);
93 static int arc_output(struct ifnet *, struct mbuf *, struct sockaddr *,
96 #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp))
98 #define gotoerr(e) { error = (e); goto bad;}
99 #define SIN(s) ((struct sockaddr_in *)s)
100 #define SIPX(s) ((struct sockaddr_ipx *)s)
102 const uint8_t arcbroadcastaddr[1] = {0};
105 * ARCnet output routine.
106 * Encapsulate a packet of type family for the local net.
107 * Assumes that ifp is actually pointer to arccom structure.
110 arc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
113 struct arc_header *ah;
115 u_int8_t atype, adst;
118 struct altq_pktattr pktattr;
120 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
121 return (ENETDOWN); /* m, m1 aren't initialized yet */
124 * If the queueing discipline needs packet classification,
125 * do it before prepending link headers.
127 ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
129 switch (dst->sa_family) {
134 * For now, use the simple IP addr -> ARCnet addr mapping
136 if (m->m_flags & (M_BCAST|M_MCAST))
137 adst = ifp->if_broadcastaddr[0];
138 else if (ifp->if_flags & IFF_NOARP)
139 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
140 else if (!arpresolve(ifp, rt, m, dst, &adst))
141 return 0; /* not resolved yet */
143 atype = (ifp->if_flags & IFF_LINK0) ?
144 ARCTYPE_IP_OLD : ARCTYPE_IP;
149 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst))
150 return (0); /* it must be impossible, but... */
151 atype = ARCTYPE_INET6;
156 adst = SIPX(dst)->sipx_addr.x_host.c_host[5];
159 adst = ifp->if_broadcastaddr[0];
165 ah = (struct arc_header *)dst->sa_data;
166 adst = ah->arc_dhost;
167 atype = ah->arc_type;
169 if (atype == ARCTYPE_ARP) {
170 atype = (ifp->if_flags & IFF_LINK0) ?
171 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
173 #ifdef ARCNET_ALLOW_BROKEN_ARP
175 * XXX It's not clear per RFC826 if this is needed, but
176 * "assigned numbers" say this is wrong.
177 * However, e.g., AmiTCP 3.0Beta used it... we make this
178 * switchable for emergency cases. Not perfect, but...
180 if (ifp->if_flags & IFF_LINK2)
181 mtod(m, struct arphdr *)->ar_pro = atype - 1;
187 printf("%s: can't handle af%d\n", ifp->if_xname,
189 gotoerr(EAFNOSUPPORT);
192 isphds = arc_isphds(atype);
193 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, MB_DONTWAIT);
196 ah = mtod(m, struct arc_header *);
197 ah->arc_type = atype;
198 ah->arc_dhost = adst;
199 ah->arc_shost = *IF_LLADDR(ifp);
200 ah->arc_shost = ARC_LLADDR(ifp);
206 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
207 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
208 struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
210 if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
211 } else if (ah->arc_dhost == ah->arc_shost) {
212 if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
213 return (0); /* XXX */
219 error = ifq_handoff(ifp, m, &pktattr);
234 ac = (struct arccom *)ifp;
244 struct arc_header *ah;
246 ac = (struct arccom *)ifp;
247 if ((m = ac->curr_frag) == 0) {
250 /* dequeue new packet */
251 IF_DEQUEUE(&ifp->if_snd, m);
255 ah = mtod(m, struct arc_header *);
256 if (!arc_isphds(ah->arc_type))
259 ++ac->ac_seqid; /* make the seqid unique */
260 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
261 ac->fsflag = 2 * tfrags - 3;
263 ac->rsflag = ac->fsflag;
264 ac->arc_dhost = ah->arc_dhost;
265 ac->arc_shost = ah->arc_shost;
266 ac->arc_type = ah->arc_type;
268 m_adj(m, ARC_HDRNEWLEN);
272 /* split out next fragment and return it */
273 if (ac->sflag < ac->fsflag) {
274 /* we CAN'T have short packets here */
275 ac->curr_frag = m_split(m, ARC_MAX_DATA, MB_DONTWAIT);
276 if (ac->curr_frag == 0) {
281 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
283 m_freem(ac->curr_frag);
288 ah = mtod(m, struct arc_header *);
289 ah->arc_flag = ac->rsflag;
290 ah->arc_seqid = ac->ac_seqid;
293 ac->rsflag = ac->sflag;
294 } else if ((m->m_pkthdr.len >=
295 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
297 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
300 M_PREPEND(m, ARC_HDRNEWLEN_EXC, MB_DONTWAIT);
304 ah = mtod(m, struct arc_header *);
306 ah->arc_seqid = 0xFFFF;
307 ah->arc_type2 = ac->arc_type;
308 ah->arc_flag2 = ac->sflag;
309 ah->arc_seqid2 = ac->ac_seqid;
313 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
317 ah = mtod(m, struct arc_header *);
318 ah->arc_flag = ac->sflag;
319 ah->arc_seqid = ac->ac_seqid;
322 ah->arc_dhost = ac->arc_dhost;
323 ah->arc_shost = ac->arc_shost;
324 ah->arc_type = ac->arc_type;
330 * Defragmenter. Returns mbuf if last packet found, else
331 * NULL. frees imcoming mbuf as necessary.
334 __inline struct mbuf *
339 struct arc_header *ah, *ah1;
347 ac = (struct arccom *)ifp;
349 if (m->m_len < ARC_HDRNEWLEN) {
350 m = m_pullup(m, ARC_HDRNEWLEN);
357 ah = mtod(m, struct arc_header *);
360 if (!arc_isphds(typ))
366 if (ah->arc_flag == 0xff) {
369 if (m->m_len < ARC_HDRNEWLEN) {
370 m = m_pullup(m, ARC_HDRNEWLEN);
377 ah = mtod(m, struct arc_header *);
380 af = &ac->ac_fragtab[src];
382 s = "debug code error";
384 if (ah->arc_flag & 1) {
386 * first fragment. We always initialize, which is
387 * about the right thing to do, as we only want to
388 * accept one fragmented packet per src at a time.
395 af->af_maxflag = ah->arc_flag;
397 af->af_seqid = ah->arc_seqid;
402 /* check for unfragmented packet */
403 if (ah->arc_flag == 0)
406 /* do we have a first packet from that src? */
412 ah1 = mtod(m1, struct arc_header *);
414 if (ah->arc_seqid != ah1->arc_seqid) {
419 if (typ != ah1->arc_type) {
424 if (dst != ah1->arc_dhost) {
425 s = "dest host differs";
429 /* typ, seqid and dst are ok here. */
431 if (ah->arc_flag == af->af_lastseen) {
436 if (ah->arc_flag == af->af_lastseen + 2) {
437 /* ok, this is next fragment */
438 af->af_lastseen = ah->arc_flag;
439 m_adj(m,ARC_HDRNEWLEN);
442 * m_cat might free the first mbuf (with pkthdr)
443 * in 2nd chain; therefore:
446 newflen = m->m_pkthdr.len;
450 m1->m_pkthdr.len += newflen;
452 /* is it the last one? */
453 if (af->af_lastseen > af->af_maxflag) {
454 af->af_packet = NULL;
460 /* if all else fails, it is out of sequence, too */
465 af->af_packet = NULL;
471 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
478 * return 1 if Packet Header Definition Standard, else 0.
479 * For now: old IP, old ARP aren't obviously. Lacking correct information,
480 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
481 * (Apple and Novell corporations were involved, among others, in PHDS work).
482 * Easiest is to assume that everybody else uses that, too.
488 return (type != ARCTYPE_IP_OLD &&
489 type != ARCTYPE_ARP_OLD &&
490 type != ARCTYPE_DIAGNOSE);
494 * Process a received Arcnet packet;
495 * the packet is in the mbuf chain m with
499 arc_input(struct ifnet *ifp, struct mbuf *m)
501 struct arc_header *ah;
505 ASSERT_SERIALIZED(ifp->if_serializer);
507 if (!(ifp->if_flags & IFF_UP)) {
512 /* possibly defragment: */
513 m = arc_defrag(ifp, m);
519 ah = mtod(m, struct arc_header *);
520 /* does this belong to us? */
521 if (!(ifp->if_flags & IFF_PROMISC) &&
522 ah->arc_dhost != ifp->if_broadcastaddr[0] &&
523 ah->arc_dhost != ARC_LLADDR(ifp)) {
528 ifp->if_ibytes += m->m_pkthdr.len;
530 if (ah->arc_dhost == ifp->if_broadcastaddr[0]) {
531 m->m_flags |= M_BCAST|M_MCAST;
535 atype = ah->arc_type;
539 m_adj(m, ARC_HDRNEWLEN);
540 if (ipflow_fastforward(m, ifp->if_serializer))
546 m_adj(m, ARC_HDRLEN);
547 if (ipflow_fastforward(m, ifp->if_serializer))
553 if (ifp->if_flags & IFF_NOARP) {
554 /* Discard packet if ARP is disabled on interface */
558 m_adj(m, ARC_HDRNEWLEN);
560 #ifdef ARCNET_ALLOW_BROKEN_ARP
561 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
565 case ARCTYPE_ARP_OLD:
566 if (ifp->if_flags & IFF_NOARP) {
567 /* Discard packet if ARP is disabled on interface */
571 m_adj(m, ARC_HDRLEN);
573 #ifdef ARCNET_ALLOW_BROKEN_ARP
574 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
580 m_adj(m, ARC_HDRNEWLEN);
586 m_adj(m, ARC_HDRNEWLEN);
595 netisr_dispatch(isr, m);
599 * Register (new) link level address.
602 arc_storelladdr(ifp, lla)
606 ARC_LLADDR(ifp) = lla;
610 * Perform common duties while attaching to interface list
613 arc_ifattach(struct ifnet *ifp, u_int8_t lla, lwkt_serialize_t serializer)
615 struct sockaddr_dl *sdl;
618 ifp->if_input = arc_input;
619 ifp->if_output = arc_output;
620 if_attach(ifp, serializer);
621 ifp->if_type = IFT_ARCNET;
623 ifp->if_broadcastaddr = arcbroadcastaddr;
624 ifp->if_hdrlen = ARC_HDRLEN;
626 ifp->if_resolvemulti = arc_resolvemulti;
627 if (ifp->if_baudrate == 0)
628 ifp->if_baudrate = 2500000;
629 sdl = IF_LLSOCKADDR(ifp);
630 sdl->sdl_type = IFT_ARCNET;
631 sdl->sdl_alen = ifp->if_addrlen;
633 if (ifp->if_flags & IFF_BROADCAST)
634 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
636 ac = (struct arccom *)ifp;
637 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
639 /* XXX this message isn't entirely clear, to me -- cgd */
640 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
641 ifp->if_xname, ifp->if_xname);
643 arc_storelladdr(ifp, lla);
645 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
647 if_printf(ifp, "Link Address 0x%02x (%u)\n", lla, lla);
659 arc_ioctl(ifp, command, data)
664 struct ifaddr *ifa = (struct ifaddr *) data;
665 struct ifreq *ifr = (struct ifreq *) data;
670 ifp->if_flags |= IFF_UP;
671 switch (ifa->ifa_addr->sa_family) {
674 lwkt_serialize_enter(ifp->if_serializer);
675 ifp->if_init(ifp->if_softc); /* before arpwhohas */
676 lwkt_serialize_exit(ifp->if_serializer);
677 arp_ifinit(ifp, ifa);
682 * XXX This code is probably wrong
686 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
688 if (ipx_nullhost(*ina))
689 ina->x_host.c_host[5] = ARC_LLADDR(ifp);
691 arc_storelladdr(ifp, ina->x_host.c_host[5]);
696 lwkt_serialize_enter(ifp->if_serializer);
697 ifp->if_init(ifp->if_softc);
698 lwkt_serialize_exit(ifp->if_serializer);
703 lwkt_serialize_enter(ifp->if_serializer);
704 ifp->if_init(ifp->if_softc);
705 lwkt_serialize_exit(ifp->if_serializer);
714 sa = (struct sockaddr *) &ifr->ifr_data;
715 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
722 error = EAFNOSUPPORT;
724 switch (ifr->ifr_addr.sa_family) {
730 error = EAFNOSUPPORT;
738 * Set the interface MTU.
739 * mtu can't be larger than ARCMTU for RFC1051
740 * and can't be larger than ARC_PHDS_MTU
742 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
743 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
746 ifp->if_mtu = ifr->ifr_mtu;
756 /* based on ether_resolvemulti() */
758 arc_resolvemulti(ifp, llsa, sa)
760 struct sockaddr **llsa;
763 struct sockaddr_dl *sdl;
764 struct sockaddr_in *sin;
766 struct sockaddr_in6 *sin6;
769 switch(sa->sa_family) {
772 * No mapping needed. Just check that it's a valid MC address.
774 sdl = (struct sockaddr_dl *)sa;
775 if (*LLADDR(sdl) != ifp->if_broadcastaddr[0])
776 return EADDRNOTAVAIL;
781 sin = (struct sockaddr_in *)sa;
782 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
783 return EADDRNOTAVAIL;
784 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
786 sdl->sdl_len = sizeof *sdl;
787 sdl->sdl_family = AF_LINK;
788 sdl->sdl_index = ifp->if_index;
789 sdl->sdl_type = IFT_ARCNET;
790 sdl->sdl_alen = ARC_ADDR_LEN;
792 *llsa = (struct sockaddr *)sdl;
797 sin6 = (struct sockaddr_in6 *)sa;
798 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
800 * An IP6 address of 0 means listen to all
801 * of the Ethernet multicast address used for IP6.
802 * (This is used for multicast routers.)
804 ifp->if_flags |= IFF_ALLMULTI;
808 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
809 return EADDRNOTAVAIL;
810 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
812 sdl->sdl_len = sizeof *sdl;
813 sdl->sdl_family = AF_LINK;
814 sdl->sdl_index = ifp->if_index;
815 sdl->sdl_type = IFT_ARCNET;
816 sdl->sdl_alen = ARC_ADDR_LEN;
818 *llsa = (struct sockaddr *)sdl;
824 * Well, the text isn't quite right, but it's the name