1 /* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */
5 * Copyright (c) 1994, 1995 Ignatios Souvatzis
6 * Copyright (c) 1982, 1989, 1993
7 * The Regents of the University of California. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
38 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
42 #include "opt_inet6.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
49 #include <sys/protosw.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/errno.h>
53 #include <sys/syslog.h>
55 #include <machine/cpu.h>
58 #include <net/netisr.h>
59 #include <net/route.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_arc.h>
63 #include <net/if_arp.h>
66 #if defined(INET) || defined(INET6)
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/if_ether.h>
73 #include <netinet6/nd6.h>
76 MODULE_VERSION(arcnet, 1);
78 #define ARCNET_ALLOW_BROKEN_ARP
80 static struct mbuf *arc_defrag __P((struct ifnet *, struct mbuf *));
82 u_int8_t arcbroadcastaddr = 0;
84 #define senderr(e) { error = (e); goto bad;}
85 #define SIN(s) ((struct sockaddr_in *)s)
88 * ARCnet output routine.
89 * Encapsulate a packet of type family for the local net.
90 * Assumes that ifp is actually pointer to arccom structure.
93 arc_output(ifp, m, dst, rt0)
102 struct arc_header *ah;
105 u_int8_t atype, adst;
106 #if __FreeBSD_version < 500000
110 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
111 return(ENETDOWN); /* m, m1 aren't initialized yet */
114 ac = (struct arccom *)ifp;
118 if ((rt->rt_flags & RTF_UP) == 0) {
119 if ((rt0 = rt = rtalloc1(dst, 1, 0UL)))
122 senderr(EHOSTUNREACH);
124 if (rt->rt_flags & RTF_GATEWAY) {
125 if (rt->rt_gwroute == 0)
127 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
128 rtfree(rt); rt = rt0;
129 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL);
130 if ((rt = rt->rt_gwroute) == 0)
131 senderr(EHOSTUNREACH);
134 if (rt->rt_flags & RTF_REJECT)
135 if (rt->rt_rmx.rmx_expire == 0 ||
136 time_second < rt->rt_rmx.rmx_expire)
137 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
140 switch (dst->sa_family) {
145 * For now, use the simple IP addr -> ARCnet addr mapping
147 if (m->m_flags & (M_BCAST|M_MCAST))
148 adst = arcbroadcastaddr; /* ARCnet broadcast address */
149 else if (ifp->if_flags & IFF_NOARP)
150 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
151 else if (!arpresolve(ifp, rt, m, dst, &adst, rt0))
152 return 0; /* not resolved yet */
154 /* If broadcasting on a simplex interface, loopback a copy */
155 if ((m->m_flags & (M_BCAST|M_MCAST)) &&
156 (ifp->if_flags & IFF_SIMPLEX))
157 mcopy = m_copy(m, 0, (int)M_COPYALL);
158 atype = (ifp->if_flags & IFF_LINK0) ?
159 ARCTYPE_IP_OLD : ARCTYPE_IP;
165 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst))
166 return(0); /* if not yet resolves */
168 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst))
169 return(0); /* it must be impossible, but... */
170 #endif /* OLDIP6OUTPUT */
171 atype = ARCTYPE_INET6;
176 ah = (struct arc_header *)dst->sa_data;
177 adst = ah->arc_dhost;
178 atype = ah->arc_type;
180 if (atype == ARCTYPE_ARP) {
181 atype = (ifp->if_flags & IFF_LINK0) ?
182 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
184 #ifdef ARCNET_ALLOW_BROKEN_ARP
186 * XXX It's not clear per RFC826 if this is needed, but
187 * "assigned numbers" say this is wrong.
188 * However, e.g., AmiTCP 3.0Beta used it... we make this
189 * switchable for emergency cases. Not perfect, but...
191 arph = mtod(m, struct arphdr *);
192 if (ifp->if_flags & IFF_LINK2)
193 arph->ar_pro = atype - 1;
199 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
201 senderr(EAFNOSUPPORT);
205 (void) if_simloop(ifp, mcopy, dst->sa_family, 0);
207 M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT);
210 ah = mtod(m, struct arc_header *);
211 ah->arc_type = atype;
212 ah->arc_dhost = adst;
213 ah->arc_shost = *IF_LLADDR(ifp);
218 #if __FreeBSD_version < 500000
222 * Queue message on interface, and start output if interface
225 if (IF_QFULL(&ifp->if_snd)) {
226 IF_DROP(&ifp->if_snd);
230 ifp->if_obytes += m->m_pkthdr.len;
231 IF_ENQUEUE(&ifp->if_snd, m);
232 if ((ifp->if_flags & IFF_OACTIVE) == 0)
233 (*ifp->if_start)(ifp);
236 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) {
256 ac = (struct arccom *)ifp;
266 struct arc_header *ah;
268 ac = (struct arccom *)ifp;
269 if ((m = ac->curr_frag) == 0) {
272 /* dequeue new packet */
273 IF_DEQUEUE(&ifp->if_snd, m);
277 ah = mtod(m, struct arc_header *);
278 if (!arc_isphds(ah->arc_type))
281 ++ac->ac_seqid; /* make the seqid unique */
282 tfrags = (m->m_pkthdr.len + 503) / 504;
283 ac->fsflag = 2 * tfrags - 3;
285 ac->rsflag = ac->fsflag;
286 ac->arc_dhost = ah->arc_dhost;
287 ac->arc_shost = ah->arc_shost;
288 ac->arc_type = ah->arc_type;
290 m_adj(m, ARC_HDRLEN);
294 /* split out next fragment and return it */
295 if (ac->sflag < ac->fsflag) {
296 /* we CAN'T have short packets here */
297 ac->curr_frag = m_split(m, 504, M_DONTWAIT);
298 if (ac->curr_frag == 0) {
303 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
305 m_free(ac->curr_frag);
312 ah = mtod(m, struct arc_header *);
313 ah->arc_flag = ac->rsflag;
314 ah->arc_seqid = ac->ac_seqid;
317 ac->rsflag = ac->sflag;
318 } else if ((m->m_pkthdr.len >=
319 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
321 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
324 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT);
328 ah = mtod(m, struct arc_header *);
330 ah->arc_seqid = 0xFFFF;
331 ah->arc_type2 = ac->arc_type;
332 ah->arc_flag2 = ac->sflag;
333 ah->arc_seqid2 = ac->ac_seqid;
337 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
341 ah = mtod(m, struct arc_header *);
342 ah->arc_flag = ac->sflag;
343 ah->arc_seqid = ac->ac_seqid;
346 ah->arc_dhost = ac->arc_dhost;
347 ah->arc_shost = ac->arc_shost;
348 ah->arc_type = ac->arc_type;
354 * Defragmenter. Returns mbuf if last packet found, else
355 * NULL. frees imcoming mbuf as necessary.
358 __inline struct mbuf *
363 struct arc_header *ah, *ah1;
371 ac = (struct arccom *)ifp;
373 if (m->m_len < ARC_HDRNEWLEN) {
374 m = m_pullup(m, ARC_HDRNEWLEN);
381 ah = mtod(m, struct arc_header *);
384 if (!arc_isphds(typ))
390 if (ah->arc_flag == 0xff) {
393 if (m->m_len < ARC_HDRNEWLEN) {
394 m = m_pullup(m, ARC_HDRNEWLEN);
401 ah = mtod(m, struct arc_header *);
404 af = &ac->ac_fragtab[src];
406 s = "debug code error";
408 if (ah->arc_flag & 1) {
410 * first fragment. We always initialize, which is
411 * about the right thing to do, as we only want to
412 * accept one fragmented packet per src at a time.
419 af->af_maxflag = ah->arc_flag;
421 af->af_seqid = ah->arc_seqid;
426 /* check for unfragmented packet */
427 if (ah->arc_flag == 0)
430 /* do we have a first packet from that src? */
436 ah1 = mtod(m1, struct arc_header *);
438 if (ah->arc_seqid != ah1->arc_seqid) {
443 if (typ != ah1->arc_type) {
448 if (dst != ah1->arc_dhost) {
449 s = "dest host differs";
453 /* typ, seqid and dst are ok here. */
455 if (ah->arc_flag == af->af_lastseen) {
460 if (ah->arc_flag == af->af_lastseen + 2) {
461 /* ok, this is next fragment */
462 af->af_lastseen = ah->arc_flag;
463 m_adj(m,ARC_HDRNEWLEN);
466 * m_cat might free the first mbuf (with pkthdr)
467 * in 2nd chain; therefore:
470 newflen = m->m_pkthdr.len;
474 m1->m_pkthdr.len += newflen;
476 /* is it the last one? */
477 if (af->af_lastseen > af->af_maxflag) {
478 af->af_packet = NULL;
484 /* if all else fails, it is out of sequence, too */
489 af->af_packet = NULL;
495 log(LOG_INFO,"%s%d: got out of seq. packet: %s\n",
496 ifp->if_name, ifp->if_unit, s);
502 * return 1 if Packet Header Definition Standard, else 0.
503 * For now: old IP, old ARP aren't obviously. Lacking correct information,
504 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
505 * (Apple and Novell corporations were involved, among others, in PHDS work).
506 * Easiest is to assume that everybody else uses that, too.
512 return (type != ARCTYPE_IP_OLD &&
513 type != ARCTYPE_ARP_OLD &&
514 type != ARCTYPE_DIAGNOSE);
518 * Process a received Arcnet packet;
519 * the packet is in the mbuf chain m with
527 struct arc_header *ah;
533 #if __FreeBSD_version < 500000
537 if ((ifp->if_flags & IFF_UP) == 0) {
542 /* possibly defragment: */
543 m = arc_defrag(ifp, m);
550 ah = mtod(m, struct arc_header *);
552 ifp->if_ibytes += m->m_pkthdr.len;
554 if (arcbroadcastaddr == ah->arc_dhost) {
555 m->m_flags |= M_BCAST|M_MCAST;
559 atype = ah->arc_type;
563 m_adj(m, ARC_HDRNEWLEN);
564 schednetisr(NETISR_IP);
569 m_adj(m, ARC_HDRLEN);
570 schednetisr(NETISR_IP);
575 if (ifp->if_flags & IFF_NOARP) {
576 /* Discard packet if ARP is disabled on interface */
580 m_adj(m, ARC_HDRNEWLEN);
581 schednetisr(NETISR_ARP);
583 #ifdef ARCNET_ALLOW_BROKEN_ARP
584 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
588 case ARCTYPE_ARP_OLD:
589 if (ifp->if_flags & IFF_NOARP) {
590 /* Discard packet if ARP is disabled on interface */
594 m_adj(m, ARC_HDRLEN);
595 schednetisr(NETISR_ARP);
597 arph = mtod(m, struct arphdr *);
598 #ifdef ARCNET_ALLOW_BROKEN_ARP
599 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
605 m_adj(m, ARC_HDRNEWLEN);
606 schednetisr(NETISR_IPV6);
615 #if __FreeBSD_version < 500000
624 IF_HANDOFF(inq, m, NULL);
629 * Convert Arcnet address to printable (loggable) representation.
631 static char digits[] = "0123456789abcdef";
636 static char arcbuf[3];
639 *cp++ = digits[*ap >> 4];
640 *cp++ = digits[*ap++ & 0xf];
646 * Register (new) link level address.
649 arc_storelladdr(ifp, lla)
653 *IF_LLADDR(ifp) = lla;
657 * Perform common duties while attaching to interface list
660 arc_ifattach(ifp, lla)
665 struct sockaddr_dl *sdl;
669 ifp->if_type = IFT_ARCNET;
671 ifp->if_hdrlen = ARC_HDRLEN;
673 if (ifp->if_baudrate == 0)
674 ifp->if_baudrate = 2500000;
675 #if __FreeBSD_version < 500000
676 ifa = ifnet_addrs[ifp->if_index - 1];
678 ifa = ifaddr_byindex(ifp->if_index);
680 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
681 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
682 sdl->sdl_type = IFT_ARCNET;
683 sdl->sdl_alen = ifp->if_addrlen;
685 if (ifp->if_flags & IFF_BROADCAST)
686 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
688 ac = (struct arccom *)ifp;
689 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
691 /* XXX this message isn't entirely clear, to me -- cgd */
692 log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts. Please change it and ifconfig %s%d down up\n",
693 ifp->if_name, ifp->if_unit, ifp->if_name, ifp->if_unit);
695 arc_storelladdr(ifp, lla);
697 ifp->if_broadcastaddr = &arcbroadcastaddr;
699 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
711 arc_ioctl(ifp, command, data)
716 struct ifaddr *ifa = (struct ifaddr *) data;
717 struct ifreq *ifr = (struct ifreq *) data;
722 ifp->if_flags |= IFF_UP;
723 switch (ifa->ifa_addr->sa_family) {
726 ifp->if_init(ifp->if_softc); /* before arpwhohas */
727 arp_ifinit(ifp, ifa);
731 ifp->if_init(ifp->if_softc);
739 error = EAFNOSUPPORT;
741 switch (ifr->ifr_addr.sa_family) {
747 error = EAFNOSUPPORT;
755 * Set the interface MTU.
756 * mtu can't be larger than ARCMTU for RFC1051
757 * and can't be larger than ARC_PHDS_MTU
759 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
760 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
763 ifp->if_mtu = ifr->ifr_mtu;
771 sa = (struct sockaddr *) & ifr->ifr_data;
772 bcopy(IFP2AC(ifp)->ac_enaddr,
773 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);