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/module.h>
48 #include <sys/malloc.h>
50 #include <sys/protosw.h>
51 #include <sys/socket.h>
52 #include <sys/sockio.h>
53 #include <sys/errno.h>
54 #include <sys/syslog.h>
56 #include <machine/cpu.h>
59 #include <net/if_var.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>
67 #include <net/if_llatbl.h>
69 #if defined(INET) || defined(INET6)
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/if_ether.h>
76 #include <netinet6/nd6.h>
79 #define ARCNET_ALLOW_BROKEN_ARP
81 static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *);
82 static int arc_resolvemulti(struct ifnet *, struct sockaddr **,
85 u_int8_t arcbroadcastaddr = 0;
87 #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp))
89 #define senderr(e) { error = (e); goto bad;}
90 #define SIN(s) ((const struct sockaddr_in *)(s))
93 * ARCnet output routine.
94 * Encapsulate a packet of type family for the local net.
95 * Assumes that ifp is actually pointer to arccom structure.
98 arc_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
101 struct arc_header *ah;
103 u_int8_t atype, adst;
106 #if defined(INET) || defined(INET6)
110 if (!((ifp->if_flags & IFF_UP) &&
111 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
112 return(ENETDOWN); /* m, m1 aren't initialized yet */
115 #if defined(INET) || defined(INET6)
117 is_gw = (ro->ro_flags & RT_HAS_GW) != 0;
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 = arcbroadcastaddr; /* ARCnet broadcast address */
129 else if (ifp->if_flags & IFF_NOARP)
130 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
132 error = arpresolve(ifp, is_gw, m, dst, &adst, NULL);
134 return (error == EWOULDBLOCK ? 0 : error);
137 atype = (ifp->if_flags & IFF_LINK0) ?
138 ARCTYPE_IP_OLD : ARCTYPE_IP;
143 ah = mtod(m, struct arphdr *);
144 ah->ar_hrd = htons(ARPHRD_ARCNET);
146 loop_copy = -1; /* if this is for us, don't do it */
148 switch(ntohs(ah->ar_op)) {
149 case ARPOP_REVREQUEST:
151 atype = ARCTYPE_REVARP;
160 if (m->m_flags & M_BCAST)
161 bcopy(ifp->if_broadcastaddr, &adst, ARC_ADDR_LEN);
163 bcopy(ar_tha(ah), &adst, ARC_ADDR_LEN);
170 if ((m->m_flags & M_MCAST) != 0)
171 adst = arcbroadcastaddr; /* ARCnet broadcast address */
173 error = nd6_resolve(ifp, is_gw, m, dst, &adst, NULL);
175 return (error == EWOULDBLOCK ? 0 : error);
177 atype = ARCTYPE_INET6;
182 const struct arc_header *ah;
185 ah = (const struct arc_header *)dst->sa_data;
186 adst = ah->arc_dhost;
187 atype = ah->arc_type;
189 if (atype == ARCTYPE_ARP) {
190 atype = (ifp->if_flags & IFF_LINK0) ?
191 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
193 #ifdef ARCNET_ALLOW_BROKEN_ARP
195 * XXX It's not clear per RFC826 if this is needed, but
196 * "assigned numbers" say this is wrong.
197 * However, e.g., AmiTCP 3.0Beta used it... we make this
198 * switchable for emergency cases. Not perfect, but...
200 if (ifp->if_flags & IFF_LINK2)
201 mtod(m, struct arphdr *)->ar_pro = atype - 1;
207 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
208 senderr(EAFNOSUPPORT);
211 isphds = arc_isphds(atype);
212 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_NOWAIT);
215 ah = mtod(m, struct arc_header *);
216 ah->arc_type = atype;
217 ah->arc_dhost = adst;
218 ah->arc_shost = ARC_LLADDR(ifp);
224 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
225 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
226 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
228 (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
229 } else if (ah->arc_dhost == ah->arc_shost) {
230 (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
231 return (0); /* XXX */
237 error = ifp->if_transmit(ifp, m);
248 arc_frag_init(struct ifnet *ifp)
252 ac = (struct arccom *)ifp->if_l2com;
257 arc_frag_next(struct ifnet *ifp)
261 struct arc_header *ah;
263 ac = (struct arccom *)ifp->if_l2com;
264 if ((m = ac->curr_frag) == NULL) {
267 /* dequeue new packet */
268 IF_DEQUEUE(&ifp->if_snd, m);
272 ah = mtod(m, struct arc_header *);
273 if (!arc_isphds(ah->arc_type))
276 ++ac->ac_seqid; /* make the seqid unique */
277 tfrags = howmany(m->m_pkthdr.len, ARC_MAX_DATA);
278 ac->fsflag = 2 * tfrags - 3;
280 ac->rsflag = ac->fsflag;
281 ac->arc_dhost = ah->arc_dhost;
282 ac->arc_shost = ah->arc_shost;
283 ac->arc_type = ah->arc_type;
285 m_adj(m, ARC_HDRNEWLEN);
289 /* split out next fragment and return it */
290 if (ac->sflag < ac->fsflag) {
291 /* we CAN'T have short packets here */
292 ac->curr_frag = m_split(m, ARC_MAX_DATA, M_NOWAIT);
293 if (ac->curr_frag == 0) {
298 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
300 m_freem(ac->curr_frag);
305 ah = mtod(m, struct arc_header *);
306 ah->arc_flag = ac->rsflag;
307 ah->arc_seqid = ac->ac_seqid;
310 ac->rsflag = ac->sflag;
311 } else if ((m->m_pkthdr.len >=
312 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
314 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
317 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_NOWAIT);
321 ah = mtod(m, struct arc_header *);
323 ah->arc_seqid = 0xFFFF;
324 ah->arc_type2 = ac->arc_type;
325 ah->arc_flag2 = ac->sflag;
326 ah->arc_seqid2 = ac->ac_seqid;
330 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
334 ah = mtod(m, struct arc_header *);
335 ah->arc_flag = ac->sflag;
336 ah->arc_seqid = ac->ac_seqid;
339 ah->arc_dhost = ac->arc_dhost;
340 ah->arc_shost = ac->arc_shost;
341 ah->arc_type = ac->arc_type;
347 * Defragmenter. Returns mbuf if last packet found, else
348 * NULL. frees incoming mbuf as necessary.
351 static __inline struct mbuf *
352 arc_defrag(struct ifnet *ifp, struct mbuf *m)
354 struct arc_header *ah, *ah1;
362 ac = (struct arccom *)ifp->if_l2com;
364 if (m->m_len < ARC_HDRNEWLEN) {
365 m = m_pullup(m, ARC_HDRNEWLEN);
367 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
372 ah = mtod(m, struct arc_header *);
375 if (!arc_isphds(typ))
381 if (ah->arc_flag == 0xff) {
384 if (m->m_len < ARC_HDRNEWLEN) {
385 m = m_pullup(m, ARC_HDRNEWLEN);
387 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
392 ah = mtod(m, struct arc_header *);
395 af = &ac->ac_fragtab[src];
397 s = "debug code error";
399 if (ah->arc_flag & 1) {
401 * first fragment. We always initialize, which is
402 * about the right thing to do, as we only want to
403 * accept one fragmented packet per src at a time.
410 af->af_maxflag = ah->arc_flag;
412 af->af_seqid = ah->arc_seqid;
417 /* check for unfragmented packet */
418 if (ah->arc_flag == 0)
421 /* do we have a first packet from that src? */
427 ah1 = mtod(m1, struct arc_header *);
429 if (ah->arc_seqid != ah1->arc_seqid) {
434 if (typ != ah1->arc_type) {
439 if (dst != ah1->arc_dhost) {
440 s = "dest host differs";
444 /* typ, seqid and dst are ok here. */
446 if (ah->arc_flag == af->af_lastseen) {
451 if (ah->arc_flag == af->af_lastseen + 2) {
452 /* ok, this is next fragment */
453 af->af_lastseen = ah->arc_flag;
454 m_adj(m,ARC_HDRNEWLEN);
457 * m_cat might free the first mbuf (with pkthdr)
458 * in 2nd chain; therefore:
461 newflen = m->m_pkthdr.len;
465 m1->m_pkthdr.len += newflen;
467 /* is it the last one? */
468 if (af->af_lastseen > af->af_maxflag) {
469 af->af_packet = NULL;
475 /* if all else fails, it is out of sequence, too */
480 af->af_packet = NULL;
486 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
493 * return 1 if Packet Header Definition Standard, else 0.
494 * For now: old IP, old ARP aren't obviously. Lacking correct information,
495 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
496 * (Apple and Novell corporations were involved, among others, in PHDS work).
497 * Easiest is to assume that everybody else uses that, too.
500 arc_isphds(u_int8_t type)
502 return (type != ARCTYPE_IP_OLD &&
503 type != ARCTYPE_ARP_OLD &&
504 type != ARCTYPE_DIAGNOSE);
508 * Process a received Arcnet packet;
509 * the packet is in the mbuf chain m with
513 arc_input(struct ifnet *ifp, struct mbuf *m)
515 struct arc_header *ah;
519 if ((ifp->if_flags & IFF_UP) == 0) {
524 /* possibly defragment: */
525 m = arc_defrag(ifp, m);
531 ah = mtod(m, struct arc_header *);
532 /* does this belong to us? */
533 if ((ifp->if_flags & IFF_PROMISC) == 0
534 && ah->arc_dhost != arcbroadcastaddr
535 && ah->arc_dhost != ARC_LLADDR(ifp)) {
540 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
542 if (ah->arc_dhost == arcbroadcastaddr) {
543 m->m_flags |= M_BCAST|M_MCAST;
544 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
547 atype = ah->arc_type;
551 m_adj(m, ARC_HDRNEWLEN);
556 m_adj(m, ARC_HDRLEN);
561 if (ifp->if_flags & IFF_NOARP) {
562 /* Discard packet if ARP is disabled on interface */
566 m_adj(m, ARC_HDRNEWLEN);
568 #ifdef ARCNET_ALLOW_BROKEN_ARP
569 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
573 case ARCTYPE_ARP_OLD:
574 if (ifp->if_flags & IFF_NOARP) {
575 /* Discard packet if ARP is disabled on interface */
579 m_adj(m, ARC_HDRLEN);
581 #ifdef ARCNET_ALLOW_BROKEN_ARP
582 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
588 m_adj(m, ARC_HDRNEWLEN);
596 M_SETFIB(m, ifp->if_fib);
597 netisr_dispatch(isr, m);
601 * Register (new) link level address.
604 arc_storelladdr(struct ifnet *ifp, u_int8_t 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)
616 struct sockaddr_dl *sdl;
621 ifp->if_hdrlen = ARC_HDRLEN;
623 ifp->if_resolvemulti = arc_resolvemulti;
624 if (ifp->if_baudrate == 0)
625 ifp->if_baudrate = 2500000;
627 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
628 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
629 sdl->sdl_type = IFT_ARCNET;
630 sdl->sdl_alen = ifp->if_addrlen;
632 if (ifp->if_flags & IFF_BROADCAST)
633 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
635 ac = (struct arccom *)ifp->if_l2com;
636 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
638 /* XXX this message isn't entirely clear, to me -- cgd */
639 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
640 ifp->if_xname, ifp->if_xname);
642 arc_storelladdr(ifp, lla);
644 ifp->if_broadcastaddr = &arcbroadcastaddr;
646 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
650 arc_ifdetach(struct ifnet *ifp)
657 arc_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
659 struct ifaddr *ifa = (struct ifaddr *) data;
660 struct ifreq *ifr = (struct ifreq *) data;
665 ifp->if_flags |= IFF_UP;
666 switch (ifa->ifa_addr->sa_family) {
669 ifp->if_init(ifp->if_softc); /* before arpwhohas */
670 arp_ifinit(ifp, ifa);
674 ifp->if_init(ifp->if_softc);
683 sa = (struct sockaddr *) &ifr->ifr_data;
684 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
691 error = EAFNOSUPPORT;
693 switch (ifr->ifr_addr.sa_family) {
699 error = EAFNOSUPPORT;
707 * Set the interface MTU.
708 * mtu can't be larger than ARCMTU for RFC1051
709 * and can't be larger than ARC_PHDS_MTU
711 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
712 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
715 ifp->if_mtu = ifr->ifr_mtu;
722 /* based on ether_resolvemulti() */
724 arc_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
727 struct sockaddr_dl *sdl;
729 struct sockaddr_in *sin;
732 struct sockaddr_in6 *sin6;
735 switch(sa->sa_family) {
738 * No mapping needed. Just check that it's a valid MC address.
740 sdl = (struct sockaddr_dl *)sa;
741 if (*LLADDR(sdl) != arcbroadcastaddr)
742 return EADDRNOTAVAIL;
747 sin = (struct sockaddr_in *)sa;
748 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
749 return EADDRNOTAVAIL;
750 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
751 sdl->sdl_alen = ARC_ADDR_LEN;
753 *llsa = (struct sockaddr *)sdl;
758 sin6 = (struct sockaddr_in6 *)sa;
759 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
761 * An IP6 address of 0 means listen to all
762 * of the Ethernet multicast address used for IP6.
763 * (This is used for multicast routers.)
765 ifp->if_flags |= IFF_ALLMULTI;
769 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
770 return EADDRNOTAVAIL;
771 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
772 sdl->sdl_alen = ARC_ADDR_LEN;
774 *llsa = (struct sockaddr *)sdl;
780 * Well, the text isn't quite right, but it's the name
787 static MALLOC_DEFINE(M_ARCCOM, "arccom", "ARCNET interface internals");
790 arc_alloc(u_char type, struct ifnet *ifp)
794 ac = malloc(sizeof(struct arccom), M_ARCCOM, M_WAITOK | M_ZERO);
801 arc_free(void *com, u_char type)
808 arc_modevent(module_t mod, int type, void *data)
813 if_register_com_alloc(IFT_ARCNET, arc_alloc, arc_free);
816 if_deregister_com_alloc(IFT_ARCNET);
825 static moduledata_t arc_mod = {
831 DECLARE_MODULE(arcnet, arc_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
832 MODULE_VERSION(arcnet, 1);