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,
135 return (error == EWOULDBLOCK ? 0 : error);
138 atype = (ifp->if_flags & IFF_LINK0) ?
139 ARCTYPE_IP_OLD : ARCTYPE_IP;
144 ah = mtod(m, struct arphdr *);
145 ah->ar_hrd = htons(ARPHRD_ARCNET);
147 loop_copy = -1; /* if this is for us, don't do it */
149 switch(ntohs(ah->ar_op)) {
150 case ARPOP_REVREQUEST:
152 atype = ARCTYPE_REVARP;
161 if (m->m_flags & M_BCAST)
162 bcopy(ifp->if_broadcastaddr, &adst, ARC_ADDR_LEN);
164 bcopy(ar_tha(ah), &adst, ARC_ADDR_LEN);
171 if ((m->m_flags & M_MCAST) != 0)
172 adst = arcbroadcastaddr; /* ARCnet broadcast address */
174 error = nd6_resolve(ifp, is_gw, m, dst, &adst, NULL,
177 return (error == EWOULDBLOCK ? 0 : error);
179 atype = ARCTYPE_INET6;
184 const struct arc_header *ah;
187 ah = (const struct arc_header *)dst->sa_data;
188 adst = ah->arc_dhost;
189 atype = ah->arc_type;
191 if (atype == ARCTYPE_ARP) {
192 atype = (ifp->if_flags & IFF_LINK0) ?
193 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
195 #ifdef ARCNET_ALLOW_BROKEN_ARP
197 * XXX It's not clear per RFC826 if this is needed, but
198 * "assigned numbers" say this is wrong.
199 * However, e.g., AmiTCP 3.0Beta used it... we make this
200 * switchable for emergency cases. Not perfect, but...
202 if (ifp->if_flags & IFF_LINK2)
203 mtod(m, struct arphdr *)->ar_pro = atype - 1;
209 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
210 senderr(EAFNOSUPPORT);
213 isphds = arc_isphds(atype);
214 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_NOWAIT);
217 ah = mtod(m, struct arc_header *);
218 ah->arc_type = atype;
219 ah->arc_dhost = adst;
220 ah->arc_shost = ARC_LLADDR(ifp);
226 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
227 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
228 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
230 (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
231 } else if (ah->arc_dhost == ah->arc_shost) {
232 (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
233 return (0); /* XXX */
239 error = ifp->if_transmit(ifp, m);
250 arc_frag_init(struct ifnet *ifp)
254 ac = (struct arccom *)ifp->if_l2com;
259 arc_frag_next(struct ifnet *ifp)
263 struct arc_header *ah;
265 ac = (struct arccom *)ifp->if_l2com;
266 if ((m = ac->curr_frag) == NULL) {
269 /* dequeue new packet */
270 IF_DEQUEUE(&ifp->if_snd, m);
274 ah = mtod(m, struct arc_header *);
275 if (!arc_isphds(ah->arc_type))
278 ++ac->ac_seqid; /* make the seqid unique */
279 tfrags = howmany(m->m_pkthdr.len, ARC_MAX_DATA);
280 ac->fsflag = 2 * tfrags - 3;
282 ac->rsflag = ac->fsflag;
283 ac->arc_dhost = ah->arc_dhost;
284 ac->arc_shost = ah->arc_shost;
285 ac->arc_type = ah->arc_type;
287 m_adj(m, ARC_HDRNEWLEN);
291 /* split out next fragment and return it */
292 if (ac->sflag < ac->fsflag) {
293 /* we CAN'T have short packets here */
294 ac->curr_frag = m_split(m, ARC_MAX_DATA, M_NOWAIT);
295 if (ac->curr_frag == 0) {
300 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
302 m_freem(ac->curr_frag);
307 ah = mtod(m, struct arc_header *);
308 ah->arc_flag = ac->rsflag;
309 ah->arc_seqid = ac->ac_seqid;
312 ac->rsflag = ac->sflag;
313 } else if ((m->m_pkthdr.len >=
314 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
316 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
319 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_NOWAIT);
323 ah = mtod(m, struct arc_header *);
325 ah->arc_seqid = 0xFFFF;
326 ah->arc_type2 = ac->arc_type;
327 ah->arc_flag2 = ac->sflag;
328 ah->arc_seqid2 = ac->ac_seqid;
332 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
336 ah = mtod(m, struct arc_header *);
337 ah->arc_flag = ac->sflag;
338 ah->arc_seqid = ac->ac_seqid;
341 ah->arc_dhost = ac->arc_dhost;
342 ah->arc_shost = ac->arc_shost;
343 ah->arc_type = ac->arc_type;
349 * Defragmenter. Returns mbuf if last packet found, else
350 * NULL. frees incoming mbuf as necessary.
353 static __inline struct mbuf *
354 arc_defrag(struct ifnet *ifp, struct mbuf *m)
356 struct arc_header *ah, *ah1;
364 ac = (struct arccom *)ifp->if_l2com;
366 if (m->m_len < ARC_HDRNEWLEN) {
367 m = m_pullup(m, ARC_HDRNEWLEN);
369 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
374 ah = mtod(m, struct arc_header *);
377 if (!arc_isphds(typ))
383 if (ah->arc_flag == 0xff) {
386 if (m->m_len < ARC_HDRNEWLEN) {
387 m = m_pullup(m, ARC_HDRNEWLEN);
389 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
394 ah = mtod(m, struct arc_header *);
397 af = &ac->ac_fragtab[src];
399 s = "debug code error";
401 if (ah->arc_flag & 1) {
403 * first fragment. We always initialize, which is
404 * about the right thing to do, as we only want to
405 * accept one fragmented packet per src at a time.
412 af->af_maxflag = ah->arc_flag;
414 af->af_seqid = ah->arc_seqid;
419 /* check for unfragmented packet */
420 if (ah->arc_flag == 0)
423 /* do we have a first packet from that src? */
429 ah1 = mtod(m1, struct arc_header *);
431 if (ah->arc_seqid != ah1->arc_seqid) {
436 if (typ != ah1->arc_type) {
441 if (dst != ah1->arc_dhost) {
442 s = "dest host differs";
446 /* typ, seqid and dst are ok here. */
448 if (ah->arc_flag == af->af_lastseen) {
453 if (ah->arc_flag == af->af_lastseen + 2) {
454 /* ok, this is next fragment */
455 af->af_lastseen = ah->arc_flag;
456 m_adj(m,ARC_HDRNEWLEN);
459 * m_cat might free the first mbuf (with pkthdr)
460 * in 2nd chain; therefore:
463 newflen = m->m_pkthdr.len;
467 m1->m_pkthdr.len += newflen;
469 /* is it the last one? */
470 if (af->af_lastseen > af->af_maxflag) {
471 af->af_packet = NULL;
477 /* if all else fails, it is out of sequence, too */
482 af->af_packet = NULL;
488 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
495 * return 1 if Packet Header Definition Standard, else 0.
496 * For now: old IP, old ARP aren't obviously. Lacking correct information,
497 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
498 * (Apple and Novell corporations were involved, among others, in PHDS work).
499 * Easiest is to assume that everybody else uses that, too.
502 arc_isphds(u_int8_t type)
504 return (type != ARCTYPE_IP_OLD &&
505 type != ARCTYPE_ARP_OLD &&
506 type != ARCTYPE_DIAGNOSE);
510 * Process a received Arcnet packet;
511 * the packet is in the mbuf chain m with
515 arc_input(struct ifnet *ifp, struct mbuf *m)
517 struct arc_header *ah;
521 if ((ifp->if_flags & IFF_UP) == 0) {
526 /* possibly defragment: */
527 m = arc_defrag(ifp, m);
533 ah = mtod(m, struct arc_header *);
534 /* does this belong to us? */
535 if ((ifp->if_flags & IFF_PROMISC) == 0
536 && ah->arc_dhost != arcbroadcastaddr
537 && ah->arc_dhost != ARC_LLADDR(ifp)) {
542 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
544 if (ah->arc_dhost == arcbroadcastaddr) {
545 m->m_flags |= M_BCAST|M_MCAST;
546 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
549 atype = ah->arc_type;
553 m_adj(m, ARC_HDRNEWLEN);
558 m_adj(m, ARC_HDRLEN);
563 if (ifp->if_flags & IFF_NOARP) {
564 /* Discard packet if ARP is disabled on interface */
568 m_adj(m, ARC_HDRNEWLEN);
570 #ifdef ARCNET_ALLOW_BROKEN_ARP
571 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
575 case ARCTYPE_ARP_OLD:
576 if (ifp->if_flags & IFF_NOARP) {
577 /* Discard packet if ARP is disabled on interface */
581 m_adj(m, ARC_HDRLEN);
583 #ifdef ARCNET_ALLOW_BROKEN_ARP
584 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
590 m_adj(m, ARC_HDRNEWLEN);
598 M_SETFIB(m, ifp->if_fib);
599 netisr_dispatch(isr, m);
603 * Register (new) link level address.
606 arc_storelladdr(struct ifnet *ifp, u_int8_t lla)
608 ARC_LLADDR(ifp) = lla;
612 * Perform common duties while attaching to interface list
615 arc_ifattach(struct ifnet *ifp, u_int8_t lla)
618 struct sockaddr_dl *sdl;
623 ifp->if_hdrlen = ARC_HDRLEN;
625 ifp->if_resolvemulti = arc_resolvemulti;
626 if (ifp->if_baudrate == 0)
627 ifp->if_baudrate = 2500000;
629 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
630 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
631 sdl->sdl_type = IFT_ARCNET;
632 sdl->sdl_alen = ifp->if_addrlen;
634 if (ifp->if_flags & IFF_BROADCAST)
635 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
637 ac = (struct arccom *)ifp->if_l2com;
638 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
640 /* XXX this message isn't entirely clear, to me -- cgd */
641 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
642 ifp->if_xname, ifp->if_xname);
644 arc_storelladdr(ifp, lla);
646 ifp->if_broadcastaddr = &arcbroadcastaddr;
648 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
652 arc_ifdetach(struct ifnet *ifp)
659 arc_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
661 struct ifaddr *ifa = (struct ifaddr *) data;
662 struct ifreq *ifr = (struct ifreq *) data;
667 ifp->if_flags |= IFF_UP;
668 switch (ifa->ifa_addr->sa_family) {
671 ifp->if_init(ifp->if_softc); /* before arpwhohas */
672 arp_ifinit(ifp, ifa);
676 ifp->if_init(ifp->if_softc);
685 sa = (struct sockaddr *) &ifr->ifr_data;
686 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
693 error = EAFNOSUPPORT;
695 switch (ifr->ifr_addr.sa_family) {
701 error = EAFNOSUPPORT;
709 * Set the interface MTU.
710 * mtu can't be larger than ARCMTU for RFC1051
711 * and can't be larger than ARC_PHDS_MTU
713 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
714 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
717 ifp->if_mtu = ifr->ifr_mtu;
724 /* based on ether_resolvemulti() */
726 arc_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
729 struct sockaddr_dl *sdl;
731 struct sockaddr_in *sin;
734 struct sockaddr_in6 *sin6;
737 switch(sa->sa_family) {
740 * No mapping needed. Just check that it's a valid MC address.
742 sdl = (struct sockaddr_dl *)sa;
743 if (*LLADDR(sdl) != arcbroadcastaddr)
744 return EADDRNOTAVAIL;
749 sin = (struct sockaddr_in *)sa;
750 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
751 return EADDRNOTAVAIL;
752 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
753 sdl->sdl_alen = ARC_ADDR_LEN;
755 *llsa = (struct sockaddr *)sdl;
760 sin6 = (struct sockaddr_in6 *)sa;
761 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
763 * An IP6 address of 0 means listen to all
764 * of the Ethernet multicast address used for IP6.
765 * (This is used for multicast routers.)
767 ifp->if_flags |= IFF_ALLMULTI;
771 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
772 return EADDRNOTAVAIL;
773 sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
774 sdl->sdl_alen = ARC_ADDR_LEN;
776 *llsa = (struct sockaddr *)sdl;
782 * Well, the text isn't quite right, but it's the name
789 static MALLOC_DEFINE(M_ARCCOM, "arccom", "ARCNET interface internals");
792 arc_alloc(u_char type, struct ifnet *ifp)
796 ac = malloc(sizeof(struct arccom), M_ARCCOM, M_WAITOK | M_ZERO);
803 arc_free(void *com, u_char type)
810 arc_modevent(module_t mod, int type, void *data)
815 if_register_com_alloc(IFT_ARCNET, arc_alloc, arc_free);
818 if_deregister_com_alloc(IFT_ARCNET);
827 static moduledata_t arc_mod = {
833 DECLARE_MODULE(arcnet, arc_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
834 MODULE_VERSION(arcnet, 1);