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 1.21 2006/12/22 23:44:54 swildner 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 kprintf("%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);
229 arc_frag_init(struct ifnet *ifp)
233 ac = (struct arccom *)ifp;
238 arc_frag_next(struct ifnet *ifp)
242 struct arc_header *ah;
244 ac = (struct arccom *)ifp;
245 if ((m = ac->curr_frag) == 0) {
248 /* dequeue new packet */
249 IF_DEQUEUE(&ifp->if_snd, m);
253 ah = mtod(m, struct arc_header *);
254 if (!arc_isphds(ah->arc_type))
257 ++ac->ac_seqid; /* make the seqid unique */
258 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
259 ac->fsflag = 2 * tfrags - 3;
261 ac->rsflag = ac->fsflag;
262 ac->arc_dhost = ah->arc_dhost;
263 ac->arc_shost = ah->arc_shost;
264 ac->arc_type = ah->arc_type;
266 m_adj(m, ARC_HDRNEWLEN);
270 /* split out next fragment and return it */
271 if (ac->sflag < ac->fsflag) {
272 /* we CAN'T have short packets here */
273 ac->curr_frag = m_split(m, ARC_MAX_DATA, MB_DONTWAIT);
274 if (ac->curr_frag == 0) {
279 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
281 m_freem(ac->curr_frag);
286 ah = mtod(m, struct arc_header *);
287 ah->arc_flag = ac->rsflag;
288 ah->arc_seqid = ac->ac_seqid;
291 ac->rsflag = ac->sflag;
292 } else if ((m->m_pkthdr.len >=
293 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
295 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
298 M_PREPEND(m, ARC_HDRNEWLEN_EXC, MB_DONTWAIT);
302 ah = mtod(m, struct arc_header *);
304 ah->arc_seqid = 0xFFFF;
305 ah->arc_type2 = ac->arc_type;
306 ah->arc_flag2 = ac->sflag;
307 ah->arc_seqid2 = ac->ac_seqid;
311 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
315 ah = mtod(m, struct arc_header *);
316 ah->arc_flag = ac->sflag;
317 ah->arc_seqid = ac->ac_seqid;
320 ah->arc_dhost = ac->arc_dhost;
321 ah->arc_shost = ac->arc_shost;
322 ah->arc_type = ac->arc_type;
328 * Defragmenter. Returns mbuf if last packet found, else
329 * NULL. frees imcoming mbuf as necessary.
332 __inline struct mbuf *
333 arc_defrag(struct ifnet *ifp, struct mbuf *m)
335 struct arc_header *ah, *ah1;
343 ac = (struct arccom *)ifp;
345 if (m->m_len < ARC_HDRNEWLEN) {
346 m = m_pullup(m, ARC_HDRNEWLEN);
353 ah = mtod(m, struct arc_header *);
356 if (!arc_isphds(typ))
362 if (ah->arc_flag == 0xff) {
365 if (m->m_len < ARC_HDRNEWLEN) {
366 m = m_pullup(m, ARC_HDRNEWLEN);
373 ah = mtod(m, struct arc_header *);
376 af = &ac->ac_fragtab[src];
378 s = "debug code error";
380 if (ah->arc_flag & 1) {
382 * first fragment. We always initialize, which is
383 * about the right thing to do, as we only want to
384 * accept one fragmented packet per src at a time.
391 af->af_maxflag = ah->arc_flag;
393 af->af_seqid = ah->arc_seqid;
398 /* check for unfragmented packet */
399 if (ah->arc_flag == 0)
402 /* do we have a first packet from that src? */
408 ah1 = mtod(m1, struct arc_header *);
410 if (ah->arc_seqid != ah1->arc_seqid) {
415 if (typ != ah1->arc_type) {
420 if (dst != ah1->arc_dhost) {
421 s = "dest host differs";
425 /* typ, seqid and dst are ok here. */
427 if (ah->arc_flag == af->af_lastseen) {
432 if (ah->arc_flag == af->af_lastseen + 2) {
433 /* ok, this is next fragment */
434 af->af_lastseen = ah->arc_flag;
435 m_adj(m,ARC_HDRNEWLEN);
438 * m_cat might free the first mbuf (with pkthdr)
439 * in 2nd chain; therefore:
442 newflen = m->m_pkthdr.len;
446 m1->m_pkthdr.len += newflen;
448 /* is it the last one? */
449 if (af->af_lastseen > af->af_maxflag) {
450 af->af_packet = NULL;
456 /* if all else fails, it is out of sequence, too */
461 af->af_packet = NULL;
467 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
474 * return 1 if Packet Header Definition Standard, else 0.
475 * For now: old IP, old ARP aren't obviously. Lacking correct information,
476 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
477 * (Apple and Novell corporations were involved, among others, in PHDS work).
478 * Easiest is to assume that everybody else uses that, too.
483 return (type != ARCTYPE_IP_OLD &&
484 type != ARCTYPE_ARP_OLD &&
485 type != ARCTYPE_DIAGNOSE);
489 * Process a received Arcnet packet;
490 * the packet is in the mbuf chain m with
494 arc_input(struct ifnet *ifp, struct mbuf *m)
496 struct arc_header *ah;
500 ASSERT_SERIALIZED(ifp->if_serializer);
502 if (!(ifp->if_flags & IFF_UP)) {
507 /* possibly defragment: */
508 m = arc_defrag(ifp, m);
514 ah = mtod(m, struct arc_header *);
515 /* does this belong to us? */
516 if (!(ifp->if_flags & IFF_PROMISC) &&
517 ah->arc_dhost != ifp->if_broadcastaddr[0] &&
518 ah->arc_dhost != ARC_LLADDR(ifp)) {
523 ifp->if_ibytes += m->m_pkthdr.len;
525 if (ah->arc_dhost == ifp->if_broadcastaddr[0]) {
526 m->m_flags |= M_BCAST|M_MCAST;
530 atype = ah->arc_type;
534 m_adj(m, ARC_HDRNEWLEN);
535 if (ipflow_fastforward(m, ifp->if_serializer))
541 m_adj(m, ARC_HDRLEN);
542 if (ipflow_fastforward(m, ifp->if_serializer))
548 if (ifp->if_flags & IFF_NOARP) {
549 /* Discard packet if ARP is disabled on interface */
553 m_adj(m, ARC_HDRNEWLEN);
555 #ifdef ARCNET_ALLOW_BROKEN_ARP
556 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
560 case ARCTYPE_ARP_OLD:
561 if (ifp->if_flags & IFF_NOARP) {
562 /* Discard packet if ARP is disabled on interface */
566 m_adj(m, ARC_HDRLEN);
568 #ifdef ARCNET_ALLOW_BROKEN_ARP
569 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
575 m_adj(m, ARC_HDRNEWLEN);
581 m_adj(m, ARC_HDRNEWLEN);
590 netisr_dispatch(isr, m);
594 * Register (new) link level address.
597 arc_storelladdr(struct ifnet *ifp, u_int8_t lla)
599 ARC_LLADDR(ifp) = lla;
603 * Perform common duties while attaching to interface list
606 arc_ifattach(struct ifnet *ifp, u_int8_t lla, lwkt_serialize_t serializer)
608 struct sockaddr_dl *sdl;
611 ifp->if_input = arc_input;
612 ifp->if_output = arc_output;
613 if_attach(ifp, serializer);
614 ifp->if_type = IFT_ARCNET;
616 ifp->if_broadcastaddr = arcbroadcastaddr;
617 ifp->if_hdrlen = ARC_HDRLEN;
619 ifp->if_resolvemulti = arc_resolvemulti;
620 if (ifp->if_baudrate == 0)
621 ifp->if_baudrate = 2500000;
622 sdl = IF_LLSOCKADDR(ifp);
623 sdl->sdl_type = IFT_ARCNET;
624 sdl->sdl_alen = ifp->if_addrlen;
626 if (ifp->if_flags & IFF_BROADCAST)
627 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
629 ac = (struct arccom *)ifp;
630 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
632 /* XXX this message isn't entirely clear, to me -- cgd */
633 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
634 ifp->if_xname, ifp->if_xname);
636 arc_storelladdr(ifp, lla);
638 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
640 if_printf(ifp, "Link Address 0x%02x (%u)\n", lla, lla);
644 arc_ifdetach(struct ifnet *ifp)
651 arc_ioctl(struct ifnet *ifp, int command, caddr_t data)
653 struct ifaddr *ifa = (struct ifaddr *) data;
654 struct ifreq *ifr = (struct ifreq *) data;
659 ifp->if_flags |= IFF_UP;
660 switch (ifa->ifa_addr->sa_family) {
663 lwkt_serialize_enter(ifp->if_serializer);
664 ifp->if_init(ifp->if_softc); /* before arpwhohas */
665 lwkt_serialize_exit(ifp->if_serializer);
666 arp_ifinit(ifp, ifa);
671 * XXX This code is probably wrong
675 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
677 if (ipx_nullhost(*ina))
678 ina->x_host.c_host[5] = ARC_LLADDR(ifp);
680 arc_storelladdr(ifp, ina->x_host.c_host[5]);
685 lwkt_serialize_enter(ifp->if_serializer);
686 ifp->if_init(ifp->if_softc);
687 lwkt_serialize_exit(ifp->if_serializer);
692 lwkt_serialize_enter(ifp->if_serializer);
693 ifp->if_init(ifp->if_softc);
694 lwkt_serialize_exit(ifp->if_serializer);
703 sa = (struct sockaddr *) &ifr->ifr_data;
704 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
711 error = EAFNOSUPPORT;
713 switch (ifr->ifr_addr.sa_family) {
719 error = EAFNOSUPPORT;
727 * Set the interface MTU.
728 * mtu can't be larger than ARCMTU for RFC1051
729 * and can't be larger than ARC_PHDS_MTU
731 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
732 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
735 ifp->if_mtu = ifr->ifr_mtu;
745 /* based on ether_resolvemulti() */
747 arc_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
750 struct sockaddr_dl *sdl;
751 struct sockaddr_in *sin;
753 struct sockaddr_in6 *sin6;
756 switch(sa->sa_family) {
759 * No mapping needed. Just check that it's a valid MC address.
761 sdl = (struct sockaddr_dl *)sa;
762 if (*LLADDR(sdl) != ifp->if_broadcastaddr[0])
763 return EADDRNOTAVAIL;
768 sin = (struct sockaddr_in *)sa;
769 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
770 return EADDRNOTAVAIL;
771 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
773 sdl->sdl_len = sizeof *sdl;
774 sdl->sdl_family = AF_LINK;
775 sdl->sdl_index = ifp->if_index;
776 sdl->sdl_type = IFT_ARCNET;
777 sdl->sdl_alen = ARC_ADDR_LEN;
779 *llsa = (struct sockaddr *)sdl;
784 sin6 = (struct sockaddr_in6 *)sa;
785 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
787 * An IP6 address of 0 means listen to all
788 * of the Ethernet multicast address used for IP6.
789 * (This is used for multicast routers.)
791 ifp->if_flags |= IFF_ALLMULTI;
795 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
796 return EADDRNOTAVAIL;
797 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
799 sdl->sdl_len = sizeof *sdl;
800 sdl->sdl_family = AF_LINK;
801 sdl->sdl_index = ifp->if_index;
802 sdl->sdl_type = IFT_ARCNET;
803 sdl->sdl_alen = ARC_ADDR_LEN;
805 *llsa = (struct sockaddr *)sdl;
811 * Well, the text isn't quite right, but it's the name