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 1.13 2005/01/23 20:23:22 joerg 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>
57 #include <machine/cpu.h>
60 #include <net/netisr.h>
61 #include <net/route.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_arc.h>
65 #include <net/if_arp.h>
68 #if defined(INET) || defined(INET6)
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/if_ether.h>
75 #include <netinet6/nd6.h>
79 #include <netproto/ipx/ipx.h>
80 #include <netproto/ipx/ipx_if.h>
83 MODULE_VERSION(arcnet, 1);
85 #define ARCNET_ALLOW_BROKEN_ARP
87 static struct mbuf *arc_defrag (struct ifnet *, struct mbuf *);
88 static int arc_resolvemulti (struct ifnet *, struct sockaddr **,
90 static void arc_input(struct ifnet *, struct mbuf *);
91 static int arc_output(struct ifnet *, struct mbuf *, struct sockaddr *,
94 #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp))
96 #define gotoerr(e) { error = (e); goto bad;}
97 #define SIN(s) ((struct sockaddr_in *)s)
98 #define SIPX(s) ((struct sockaddr_ipx *)s)
100 const uint8_t arcbroadcastaddr[1] = {0};
103 * ARCnet output routine.
104 * Encapsulate a packet of type family for the local net.
105 * Assumes that ifp is actually pointer to arccom structure.
108 arc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
111 struct arc_header *ah;
113 u_int8_t atype, adst;
117 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
118 return (ENETDOWN); /* m, m1 aren't initialized yet */
120 switch (dst->sa_family) {
125 * For now, use the simple IP addr -> ARCnet addr mapping
127 if (m->m_flags & (M_BCAST|M_MCAST))
128 adst = ifp->if_broadcastaddr[0];
129 else if (ifp->if_flags & IFF_NOARP)
130 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
131 else if (!arpresolve(ifp, rt, m, dst, &adst))
132 return 0; /* not resolved yet */
134 atype = (ifp->if_flags & IFF_LINK0) ?
135 ARCTYPE_IP_OLD : ARCTYPE_IP;
140 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst))
141 return (0); /* it must be impossible, but... */
142 atype = ARCTYPE_INET6;
147 adst = SIPX(dst)->sipx_addr.x_host.c_host[5];
150 adst = ifp->if_broadcastaddr[0];
156 ah = (struct arc_header *)dst->sa_data;
157 adst = ah->arc_dhost;
158 atype = ah->arc_type;
160 if (atype == ARCTYPE_ARP) {
161 atype = (ifp->if_flags & IFF_LINK0) ?
162 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
164 #ifdef ARCNET_ALLOW_BROKEN_ARP
166 * XXX It's not clear per RFC826 if this is needed, but
167 * "assigned numbers" say this is wrong.
168 * However, e.g., AmiTCP 3.0Beta used it... we make this
169 * switchable for emergency cases. Not perfect, but...
171 if (ifp->if_flags & IFF_LINK2)
172 mtod(m, struct arphdr *)->ar_pro = atype - 1;
178 printf("%s: can't handle af%d\n", ifp->if_xname,
180 gotoerr(EAFNOSUPPORT);
183 isphds = arc_isphds(atype);
184 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, MB_DONTWAIT);
187 ah = mtod(m, struct arc_header *);
188 ah->arc_type = atype;
189 ah->arc_dhost = adst;
190 ah->arc_shost = *IF_LLADDR(ifp);
191 ah->arc_shost = ARC_LLADDR(ifp);
197 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
198 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
199 struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
201 if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
202 } else if (ah->arc_dhost == ah->arc_shost) {
203 if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
204 return (0); /* XXX */
210 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) {
229 ac = (struct arccom *)ifp;
239 struct arc_header *ah;
241 ac = (struct arccom *)ifp;
242 if ((m = ac->curr_frag) == 0) {
245 /* dequeue new packet */
246 IF_DEQUEUE(&ifp->if_snd, m);
250 ah = mtod(m, struct arc_header *);
251 if (!arc_isphds(ah->arc_type))
254 ++ac->ac_seqid; /* make the seqid unique */
255 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
256 ac->fsflag = 2 * tfrags - 3;
258 ac->rsflag = ac->fsflag;
259 ac->arc_dhost = ah->arc_dhost;
260 ac->arc_shost = ah->arc_shost;
261 ac->arc_type = ah->arc_type;
263 m_adj(m, ARC_HDRNEWLEN);
267 /* split out next fragment and return it */
268 if (ac->sflag < ac->fsflag) {
269 /* we CAN'T have short packets here */
270 ac->curr_frag = m_split(m, ARC_MAX_DATA, MB_DONTWAIT);
271 if (ac->curr_frag == 0) {
276 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
278 m_freem(ac->curr_frag);
283 ah = mtod(m, struct arc_header *);
284 ah->arc_flag = ac->rsflag;
285 ah->arc_seqid = ac->ac_seqid;
288 ac->rsflag = ac->sflag;
289 } else if ((m->m_pkthdr.len >=
290 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
292 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
295 M_PREPEND(m, ARC_HDRNEWLEN_EXC, MB_DONTWAIT);
299 ah = mtod(m, struct arc_header *);
301 ah->arc_seqid = 0xFFFF;
302 ah->arc_type2 = ac->arc_type;
303 ah->arc_flag2 = ac->sflag;
304 ah->arc_seqid2 = ac->ac_seqid;
308 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
312 ah = mtod(m, struct arc_header *);
313 ah->arc_flag = ac->sflag;
314 ah->arc_seqid = ac->ac_seqid;
317 ah->arc_dhost = ac->arc_dhost;
318 ah->arc_shost = ac->arc_shost;
319 ah->arc_type = ac->arc_type;
325 * Defragmenter. Returns mbuf if last packet found, else
326 * NULL. frees imcoming mbuf as necessary.
329 __inline struct mbuf *
334 struct arc_header *ah, *ah1;
342 ac = (struct arccom *)ifp;
344 if (m->m_len < ARC_HDRNEWLEN) {
345 m = m_pullup(m, ARC_HDRNEWLEN);
352 ah = mtod(m, struct arc_header *);
355 if (!arc_isphds(typ))
361 if (ah->arc_flag == 0xff) {
364 if (m->m_len < ARC_HDRNEWLEN) {
365 m = m_pullup(m, ARC_HDRNEWLEN);
372 ah = mtod(m, struct arc_header *);
375 af = &ac->ac_fragtab[src];
377 s = "debug code error";
379 if (ah->arc_flag & 1) {
381 * first fragment. We always initialize, which is
382 * about the right thing to do, as we only want to
383 * accept one fragmented packet per src at a time.
390 af->af_maxflag = ah->arc_flag;
392 af->af_seqid = ah->arc_seqid;
397 /* check for unfragmented packet */
398 if (ah->arc_flag == 0)
401 /* do we have a first packet from that src? */
407 ah1 = mtod(m1, struct arc_header *);
409 if (ah->arc_seqid != ah1->arc_seqid) {
414 if (typ != ah1->arc_type) {
419 if (dst != ah1->arc_dhost) {
420 s = "dest host differs";
424 /* typ, seqid and dst are ok here. */
426 if (ah->arc_flag == af->af_lastseen) {
431 if (ah->arc_flag == af->af_lastseen + 2) {
432 /* ok, this is next fragment */
433 af->af_lastseen = ah->arc_flag;
434 m_adj(m,ARC_HDRNEWLEN);
437 * m_cat might free the first mbuf (with pkthdr)
438 * in 2nd chain; therefore:
441 newflen = m->m_pkthdr.len;
445 m1->m_pkthdr.len += newflen;
447 /* is it the last one? */
448 if (af->af_lastseen > af->af_maxflag) {
449 af->af_packet = NULL;
455 /* if all else fails, it is out of sequence, too */
460 af->af_packet = NULL;
466 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
473 * return 1 if Packet Header Definition Standard, else 0.
474 * For now: old IP, old ARP aren't obviously. Lacking correct information,
475 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
476 * (Apple and Novell corporations were involved, among others, in PHDS work).
477 * 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 if (!(ifp->if_flags & IFF_UP)) {
505 /* possibly defragment: */
506 m = arc_defrag(ifp, m);
512 ah = mtod(m, struct arc_header *);
513 /* does this belong to us? */
514 if (!(ifp->if_flags & IFF_PROMISC) &&
515 ah->arc_dhost != ifp->if_broadcastaddr[0] &&
516 ah->arc_dhost != ARC_LLADDR(ifp)) {
521 ifp->if_ibytes += m->m_pkthdr.len;
523 if (ah->arc_dhost == ifp->if_broadcastaddr[0]) {
524 m->m_flags |= M_BCAST|M_MCAST;
528 atype = ah->arc_type;
532 m_adj(m, ARC_HDRNEWLEN);
533 if (ipflow_fastforward(m))
539 m_adj(m, ARC_HDRLEN);
540 if (ipflow_fastforward(m))
546 if (ifp->if_flags & IFF_NOARP) {
547 /* Discard packet if ARP is disabled on interface */
551 m_adj(m, ARC_HDRNEWLEN);
553 #ifdef ARCNET_ALLOW_BROKEN_ARP
554 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
558 case ARCTYPE_ARP_OLD:
559 if (ifp->if_flags & IFF_NOARP) {
560 /* Discard packet if ARP is disabled on interface */
564 m_adj(m, ARC_HDRLEN);
566 #ifdef ARCNET_ALLOW_BROKEN_ARP
567 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
573 m_adj(m, ARC_HDRNEWLEN);
579 m_adj(m, ARC_HDRNEWLEN);
588 netisr_dispatch(isr, m);
592 * Register (new) link level address.
595 arc_storelladdr(ifp, lla)
599 ARC_LLADDR(ifp) = lla;
603 * Perform common duties while attaching to interface list
606 arc_ifattach(ifp, lla)
611 struct sockaddr_dl *sdl;
614 ifp->if_input = arc_input;
615 ifp->if_output = arc_output;
617 ifp->if_type = IFT_ARCNET;
619 ifp->if_broadcastaddr = arcbroadcastaddr;
620 ifp->if_hdrlen = ARC_HDRLEN;
622 ifp->if_resolvemulti = arc_resolvemulti;
623 if (ifp->if_baudrate == 0)
624 ifp->if_baudrate = 2500000;
625 #if defined(__DragonFly__) || __FreeBSD_version < 500000
626 ifa = ifnet_addrs[ifp->if_index - 1];
628 ifa = ifaddr_byindex(ifp->if_index);
630 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
631 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
632 sdl->sdl_type = IFT_ARCNET;
633 sdl->sdl_alen = ifp->if_addrlen;
635 if (ifp->if_flags & IFF_BROADCAST)
636 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
638 ac = (struct arccom *)ifp;
639 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
641 /* XXX this message isn't entirely clear, to me -- cgd */
642 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
643 ifp->if_xname, ifp->if_xname);
645 arc_storelladdr(ifp, lla);
647 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
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 ifp->if_init(ifp->if_softc); /* before arpwhohas */
675 arp_ifinit(ifp, ifa);
680 * XXX This code is probably wrong
684 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
686 if (ipx_nullhost(*ina))
687 ina->x_host.c_host[5] = ARC_LLADDR(ifp);
689 arc_storelladdr(ifp, ina->x_host.c_host[5]);
694 ifp->if_init(ifp->if_softc);
699 ifp->if_init(ifp->if_softc);
708 sa = (struct sockaddr *) &ifr->ifr_data;
709 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
716 error = EAFNOSUPPORT;
718 switch (ifr->ifr_addr.sa_family) {
724 error = EAFNOSUPPORT;
732 * Set the interface MTU.
733 * mtu can't be larger than ARCMTU for RFC1051
734 * and can't be larger than ARC_PHDS_MTU
736 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
737 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
740 ifp->if_mtu = ifr->ifr_mtu;
747 /* based on ether_resolvemulti() */
749 arc_resolvemulti(ifp, llsa, sa)
751 struct sockaddr **llsa;
754 struct sockaddr_dl *sdl;
755 struct sockaddr_in *sin;
757 struct sockaddr_in6 *sin6;
760 switch(sa->sa_family) {
763 * No mapping needed. Just check that it's a valid MC address.
765 sdl = (struct sockaddr_dl *)sa;
766 if (*LLADDR(sdl) != ifp->if_broadcastaddr[0])
767 return EADDRNOTAVAIL;
772 sin = (struct sockaddr_in *)sa;
773 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
774 return EADDRNOTAVAIL;
775 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
777 sdl->sdl_len = sizeof *sdl;
778 sdl->sdl_family = AF_LINK;
779 sdl->sdl_index = ifp->if_index;
780 sdl->sdl_type = IFT_ARCNET;
781 sdl->sdl_alen = ARC_ADDR_LEN;
783 *llsa = (struct sockaddr *)sdl;
788 sin6 = (struct sockaddr_in6 *)sa;
789 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
791 * An IP6 address of 0 means listen to all
792 * of the Ethernet multicast address used for IP6.
793 * (This is used for multicast routers.)
795 ifp->if_flags |= IFF_ALLMULTI;
799 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
800 return EADDRNOTAVAIL;
801 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
803 sdl->sdl_len = sizeof *sdl;
804 sdl->sdl_family = AF_LINK;
805 sdl->sdl_index = ifp->if_index;
806 sdl->sdl_type = IFT_ARCNET;
807 sdl->sdl_alen = ARC_ADDR_LEN;
809 *llsa = (struct sockaddr *)sdl;
815 * Well, the text isn't quite right, but it's the name