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;
110 if (!((ifp->if_flags & IFF_UP) &&
111 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
112 return(ENETDOWN); /* m, m1 aren't initialized yet */
116 switch (dst->sa_family) {
121 * For now, use the simple IP addr -> ARCnet addr mapping
123 if (m->m_flags & (M_BCAST|M_MCAST))
124 adst = arcbroadcastaddr; /* ARCnet broadcast address */
125 else if (ifp->if_flags & IFF_NOARP)
126 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
129 if (ro != NULL && ro->ro_rt != NULL &&
130 (ro->ro_rt->rt_flags & RTF_GATEWAY) != 0)
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 error = nd6_storelladdr(ifp, m, dst, (u_char *)&adst, NULL);
173 atype = ARCTYPE_INET6;
178 const struct arc_header *ah;
181 ah = (const struct arc_header *)dst->sa_data;
182 adst = ah->arc_dhost;
183 atype = ah->arc_type;
185 if (atype == ARCTYPE_ARP) {
186 atype = (ifp->if_flags & IFF_LINK0) ?
187 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
189 #ifdef ARCNET_ALLOW_BROKEN_ARP
191 * XXX It's not clear per RFC826 if this is needed, but
192 * "assigned numbers" say this is wrong.
193 * However, e.g., AmiTCP 3.0Beta used it... we make this
194 * switchable for emergency cases. Not perfect, but...
196 if (ifp->if_flags & IFF_LINK2)
197 mtod(m, struct arphdr *)->ar_pro = atype - 1;
203 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
204 senderr(EAFNOSUPPORT);
207 isphds = arc_isphds(atype);
208 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_NOWAIT);
211 ah = mtod(m, struct arc_header *);
212 ah->arc_type = atype;
213 ah->arc_dhost = adst;
214 ah->arc_shost = ARC_LLADDR(ifp);
220 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
221 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
222 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
224 (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
225 } else if (ah->arc_dhost == ah->arc_shost) {
226 (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
227 return (0); /* XXX */
233 error = ifp->if_transmit(ifp, m);
244 arc_frag_init(struct ifnet *ifp)
248 ac = (struct arccom *)ifp->if_l2com;
253 arc_frag_next(struct ifnet *ifp)
257 struct arc_header *ah;
259 ac = (struct arccom *)ifp->if_l2com;
260 if ((m = ac->curr_frag) == 0) {
263 /* dequeue new packet */
264 IF_DEQUEUE(&ifp->if_snd, m);
268 ah = mtod(m, struct arc_header *);
269 if (!arc_isphds(ah->arc_type))
272 ++ac->ac_seqid; /* make the seqid unique */
273 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
274 ac->fsflag = 2 * tfrags - 3;
276 ac->rsflag = ac->fsflag;
277 ac->arc_dhost = ah->arc_dhost;
278 ac->arc_shost = ah->arc_shost;
279 ac->arc_type = ah->arc_type;
281 m_adj(m, ARC_HDRNEWLEN);
285 /* split out next fragment and return it */
286 if (ac->sflag < ac->fsflag) {
287 /* we CAN'T have short packets here */
288 ac->curr_frag = m_split(m, ARC_MAX_DATA, M_NOWAIT);
289 if (ac->curr_frag == 0) {
294 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
296 m_freem(ac->curr_frag);
301 ah = mtod(m, struct arc_header *);
302 ah->arc_flag = ac->rsflag;
303 ah->arc_seqid = ac->ac_seqid;
306 ac->rsflag = ac->sflag;
307 } else if ((m->m_pkthdr.len >=
308 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
310 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
313 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_NOWAIT);
317 ah = mtod(m, struct arc_header *);
319 ah->arc_seqid = 0xFFFF;
320 ah->arc_type2 = ac->arc_type;
321 ah->arc_flag2 = ac->sflag;
322 ah->arc_seqid2 = ac->ac_seqid;
326 M_PREPEND(m, ARC_HDRNEWLEN, M_NOWAIT);
330 ah = mtod(m, struct arc_header *);
331 ah->arc_flag = ac->sflag;
332 ah->arc_seqid = ac->ac_seqid;
335 ah->arc_dhost = ac->arc_dhost;
336 ah->arc_shost = ac->arc_shost;
337 ah->arc_type = ac->arc_type;
343 * Defragmenter. Returns mbuf if last packet found, else
344 * NULL. frees imcoming mbuf as necessary.
347 static __inline struct mbuf *
348 arc_defrag(struct ifnet *ifp, struct mbuf *m)
350 struct arc_header *ah, *ah1;
358 ac = (struct arccom *)ifp->if_l2com;
360 if (m->m_len < ARC_HDRNEWLEN) {
361 m = m_pullup(m, ARC_HDRNEWLEN);
363 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
368 ah = mtod(m, struct arc_header *);
371 if (!arc_isphds(typ))
377 if (ah->arc_flag == 0xff) {
380 if (m->m_len < ARC_HDRNEWLEN) {
381 m = m_pullup(m, ARC_HDRNEWLEN);
383 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
388 ah = mtod(m, struct arc_header *);
391 af = &ac->ac_fragtab[src];
393 s = "debug code error";
395 if (ah->arc_flag & 1) {
397 * first fragment. We always initialize, which is
398 * about the right thing to do, as we only want to
399 * accept one fragmented packet per src at a time.
406 af->af_maxflag = ah->arc_flag;
408 af->af_seqid = ah->arc_seqid;
413 /* check for unfragmented packet */
414 if (ah->arc_flag == 0)
417 /* do we have a first packet from that src? */
423 ah1 = mtod(m1, struct arc_header *);
425 if (ah->arc_seqid != ah1->arc_seqid) {
430 if (typ != ah1->arc_type) {
435 if (dst != ah1->arc_dhost) {
436 s = "dest host differs";
440 /* typ, seqid and dst are ok here. */
442 if (ah->arc_flag == af->af_lastseen) {
447 if (ah->arc_flag == af->af_lastseen + 2) {
448 /* ok, this is next fragment */
449 af->af_lastseen = ah->arc_flag;
450 m_adj(m,ARC_HDRNEWLEN);
453 * m_cat might free the first mbuf (with pkthdr)
454 * in 2nd chain; therefore:
457 newflen = m->m_pkthdr.len;
461 m1->m_pkthdr.len += newflen;
463 /* is it the last one? */
464 if (af->af_lastseen > af->af_maxflag) {
465 af->af_packet = NULL;
471 /* if all else fails, it is out of sequence, too */
476 af->af_packet = NULL;
482 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
489 * return 1 if Packet Header Definition Standard, else 0.
490 * For now: old IP, old ARP aren't obviously. Lacking correct information,
491 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
492 * (Apple and Novell corporations were involved, among others, in PHDS work).
493 * Easiest is to assume that everybody else uses that, too.
496 arc_isphds(u_int8_t type)
498 return (type != ARCTYPE_IP_OLD &&
499 type != ARCTYPE_ARP_OLD &&
500 type != ARCTYPE_DIAGNOSE);
504 * Process a received Arcnet packet;
505 * the packet is in the mbuf chain m with
509 arc_input(struct ifnet *ifp, struct mbuf *m)
511 struct arc_header *ah;
515 if ((ifp->if_flags & IFF_UP) == 0) {
520 /* possibly defragment: */
521 m = arc_defrag(ifp, m);
527 ah = mtod(m, struct arc_header *);
528 /* does this belong to us? */
529 if ((ifp->if_flags & IFF_PROMISC) == 0
530 && ah->arc_dhost != arcbroadcastaddr
531 && ah->arc_dhost != ARC_LLADDR(ifp)) {
536 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
538 if (ah->arc_dhost == arcbroadcastaddr) {
539 m->m_flags |= M_BCAST|M_MCAST;
540 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
543 atype = ah->arc_type;
547 m_adj(m, ARC_HDRNEWLEN);
548 if ((m = ip_fastforward(m)) == NULL)
554 m_adj(m, ARC_HDRLEN);
555 if ((m = ip_fastforward(m)) == NULL)
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);