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 1.10 2004/07/23 07:16:30 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 senderr(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,
113 struct arc_header *ah;
115 u_int8_t atype, adst;
119 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
120 return(ENETDOWN); /* m, m1 aren't initialized yet */
123 ac = (struct arccom *)ifp;
126 if ((rt->rt_flags & RTF_UP) == 0) {
127 if ((rt0 = rt = rtalloc1(dst, 1, 0UL)))
130 senderr(EHOSTUNREACH);
132 if (rt->rt_flags & RTF_GATEWAY) {
133 if (rt->rt_gwroute == 0)
135 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
136 rtfree(rt); rt = rt0;
137 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL);
138 if ((rt = rt->rt_gwroute) == 0)
139 senderr(EHOSTUNREACH);
142 if (rt->rt_flags & RTF_REJECT)
143 if (rt->rt_rmx.rmx_expire == 0 ||
144 time_second < rt->rt_rmx.rmx_expire)
145 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
148 switch (dst->sa_family) {
153 * For now, use the simple IP addr -> ARCnet addr mapping
155 if (m->m_flags & (M_BCAST|M_MCAST))
156 adst = ifp->if_broadcastaddr[0];
157 else if (ifp->if_flags & IFF_NOARP)
158 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
159 else if (!arpresolve(ifp, rt, m, dst, &adst, rt0))
160 return 0; /* not resolved yet */
162 atype = (ifp->if_flags & IFF_LINK0) ?
163 ARCTYPE_IP_OLD : ARCTYPE_IP;
169 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)&adst))
170 return(0); /* if not yet resolves */
172 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)&adst))
173 return(0); /* it must be impossible, but... */
174 #endif /* OLDIP6OUTPUT */
175 atype = ARCTYPE_INET6;
180 adst = SIPX(dst)->sipx_addr.x_host.c_host[5];
183 adst = ifp->if_broadcastaddr[0];
189 ah = (struct arc_header *)dst->sa_data;
190 adst = ah->arc_dhost;
191 atype = ah->arc_type;
193 if (atype == ARCTYPE_ARP) {
194 atype = (ifp->if_flags & IFF_LINK0) ?
195 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
197 #ifdef ARCNET_ALLOW_BROKEN_ARP
199 * XXX It's not clear per RFC826 if this is needed, but
200 * "assigned numbers" say this is wrong.
201 * However, e.g., AmiTCP 3.0Beta used it... we make this
202 * switchable for emergency cases. Not perfect, but...
204 if (ifp->if_flags & IFF_LINK2)
205 mtod(m, struct arphdr *)->ar_pro = atype - 1;
211 printf("%s: can't handle af%d\n", ifp->if_xname,
213 senderr(EAFNOSUPPORT);
216 isphds = arc_isphds(atype);
217 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, MB_DONTWAIT);
220 ah = mtod(m, struct arc_header *);
221 ah->arc_type = atype;
222 ah->arc_dhost = adst;
223 ah->arc_shost = *IF_LLADDR(ifp);
224 ah->arc_shost = ARC_LLADDR(ifp);
230 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
231 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
232 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
234 (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
235 } else if (ah->arc_dhost == ah->arc_shost) {
236 (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
237 return (0); /* XXX */
244 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) {
263 ac = (struct arccom *)ifp;
273 struct arc_header *ah;
275 ac = (struct arccom *)ifp;
276 if ((m = ac->curr_frag) == 0) {
279 /* dequeue new packet */
280 IF_DEQUEUE(&ifp->if_snd, m);
284 ah = mtod(m, struct arc_header *);
285 if (!arc_isphds(ah->arc_type))
288 ++ac->ac_seqid; /* make the seqid unique */
289 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
290 ac->fsflag = 2 * tfrags - 3;
292 ac->rsflag = ac->fsflag;
293 ac->arc_dhost = ah->arc_dhost;
294 ac->arc_shost = ah->arc_shost;
295 ac->arc_type = ah->arc_type;
297 m_adj(m, ARC_HDRNEWLEN);
301 /* split out next fragment and return it */
302 if (ac->sflag < ac->fsflag) {
303 /* we CAN'T have short packets here */
304 ac->curr_frag = m_split(m, ARC_MAX_DATA, MB_DONTWAIT);
305 if (ac->curr_frag == 0) {
310 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
312 m_freem(ac->curr_frag);
317 ah = mtod(m, struct arc_header *);
318 ah->arc_flag = ac->rsflag;
319 ah->arc_seqid = ac->ac_seqid;
322 ac->rsflag = ac->sflag;
323 } else if ((m->m_pkthdr.len >=
324 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
326 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
329 M_PREPEND(m, ARC_HDRNEWLEN_EXC, MB_DONTWAIT);
333 ah = mtod(m, struct arc_header *);
335 ah->arc_seqid = 0xFFFF;
336 ah->arc_type2 = ac->arc_type;
337 ah->arc_flag2 = ac->sflag;
338 ah->arc_seqid2 = ac->ac_seqid;
342 M_PREPEND(m, ARC_HDRNEWLEN, MB_DONTWAIT);
346 ah = mtod(m, struct arc_header *);
347 ah->arc_flag = ac->sflag;
348 ah->arc_seqid = ac->ac_seqid;
351 ah->arc_dhost = ac->arc_dhost;
352 ah->arc_shost = ac->arc_shost;
353 ah->arc_type = ac->arc_type;
359 * Defragmenter. Returns mbuf if last packet found, else
360 * NULL. frees imcoming mbuf as necessary.
363 __inline struct mbuf *
368 struct arc_header *ah, *ah1;
376 ac = (struct arccom *)ifp;
378 if (m->m_len < ARC_HDRNEWLEN) {
379 m = m_pullup(m, ARC_HDRNEWLEN);
386 ah = mtod(m, struct arc_header *);
389 if (!arc_isphds(typ))
395 if (ah->arc_flag == 0xff) {
398 if (m->m_len < ARC_HDRNEWLEN) {
399 m = m_pullup(m, ARC_HDRNEWLEN);
406 ah = mtod(m, struct arc_header *);
409 af = &ac->ac_fragtab[src];
411 s = "debug code error";
413 if (ah->arc_flag & 1) {
415 * first fragment. We always initialize, which is
416 * about the right thing to do, as we only want to
417 * accept one fragmented packet per src at a time.
424 af->af_maxflag = ah->arc_flag;
426 af->af_seqid = ah->arc_seqid;
431 /* check for unfragmented packet */
432 if (ah->arc_flag == 0)
435 /* do we have a first packet from that src? */
441 ah1 = mtod(m1, struct arc_header *);
443 if (ah->arc_seqid != ah1->arc_seqid) {
448 if (typ != ah1->arc_type) {
453 if (dst != ah1->arc_dhost) {
454 s = "dest host differs";
458 /* typ, seqid and dst are ok here. */
460 if (ah->arc_flag == af->af_lastseen) {
465 if (ah->arc_flag == af->af_lastseen + 2) {
466 /* ok, this is next fragment */
467 af->af_lastseen = ah->arc_flag;
468 m_adj(m,ARC_HDRNEWLEN);
471 * m_cat might free the first mbuf (with pkthdr)
472 * in 2nd chain; therefore:
475 newflen = m->m_pkthdr.len;
479 m1->m_pkthdr.len += newflen;
481 /* is it the last one? */
482 if (af->af_lastseen > af->af_maxflag) {
483 af->af_packet = NULL;
489 /* if all else fails, it is out of sequence, too */
494 af->af_packet = NULL;
500 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
507 * return 1 if Packet Header Definition Standard, else 0.
508 * For now: old IP, old ARP aren't obviously. Lacking correct information,
509 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
510 * (Apple and Novell corporations were involved, among others, in PHDS work).
511 * Easiest is to assume that everybody else uses that, too.
517 return (type != ARCTYPE_IP_OLD &&
518 type != ARCTYPE_ARP_OLD &&
519 type != ARCTYPE_DIAGNOSE);
523 * Process a received Arcnet packet;
524 * the packet is in the mbuf chain m with
528 arc_input(struct ifnet *ifp, struct mbuf *m)
530 struct arc_header *ah;
534 if ((ifp->if_flags & IFF_UP) == 0) {
539 /* possibly defragment: */
540 m = arc_defrag(ifp, m);
547 ah = mtod(m, struct arc_header *);
548 /* does this belong to us? */
549 if ((ifp->if_flags & IFF_PROMISC) == 0
550 && ah->arc_dhost != ifp->if_broadcastaddr[0]
551 && ah->arc_dhost != ARC_LLADDR(ifp)) {
556 ifp->if_ibytes += m->m_pkthdr.len;
558 if (ah->arc_dhost == ifp->if_broadcastaddr[0]) {
559 m->m_flags |= M_BCAST|M_MCAST;
563 atype = ah->arc_type;
567 m_adj(m, ARC_HDRNEWLEN);
568 if (ipflow_fastforward(m))
574 m_adj(m, ARC_HDRLEN);
575 if (ipflow_fastforward(m))
581 if (ifp->if_flags & IFF_NOARP) {
582 /* Discard packet if ARP is disabled on interface */
586 m_adj(m, ARC_HDRNEWLEN);
588 #ifdef ARCNET_ALLOW_BROKEN_ARP
589 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
593 case ARCTYPE_ARP_OLD:
594 if (ifp->if_flags & IFF_NOARP) {
595 /* Discard packet if ARP is disabled on interface */
599 m_adj(m, ARC_HDRLEN);
601 #ifdef ARCNET_ALLOW_BROKEN_ARP
602 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
608 m_adj(m, ARC_HDRNEWLEN);
614 m_adj(m, ARC_HDRNEWLEN);
623 netisr_dispatch(isr, m);
627 * Register (new) link level address.
630 arc_storelladdr(ifp, lla)
634 ARC_LLADDR(ifp) = lla;
638 * Perform common duties while attaching to interface list
641 arc_ifattach(ifp, lla)
646 struct sockaddr_dl *sdl;
649 ifp->if_input = arc_input;
650 ifp->if_output = arc_output;
652 ifp->if_type = IFT_ARCNET;
654 ifp->if_broadcastaddr = arcbroadcastaddr;
655 ifp->if_hdrlen = ARC_HDRLEN;
657 ifp->if_resolvemulti = arc_resolvemulti;
658 if (ifp->if_baudrate == 0)
659 ifp->if_baudrate = 2500000;
660 #if defined(__DragonFly__) || __FreeBSD_version < 500000
661 ifa = ifnet_addrs[ifp->if_index - 1];
663 ifa = ifaddr_byindex(ifp->if_index);
665 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__));
666 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
667 sdl->sdl_type = IFT_ARCNET;
668 sdl->sdl_alen = ifp->if_addrlen;
670 if (ifp->if_flags & IFF_BROADCAST)
671 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
673 ac = (struct arccom *)ifp;
674 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
676 /* XXX this message isn't entirely clear, to me -- cgd */
677 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
678 ifp->if_xname, ifp->if_xname);
680 arc_storelladdr(ifp, lla);
682 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
694 arc_ioctl(ifp, command, data)
699 struct ifaddr *ifa = (struct ifaddr *) data;
700 struct ifreq *ifr = (struct ifreq *) data;
705 ifp->if_flags |= IFF_UP;
706 switch (ifa->ifa_addr->sa_family) {
709 ifp->if_init(ifp->if_softc); /* before arpwhohas */
710 arp_ifinit(ifp, ifa);
715 * XXX This code is probably wrong
719 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
721 if (ipx_nullhost(*ina))
722 ina->x_host.c_host[5] = ARC_LLADDR(ifp);
724 arc_storelladdr(ifp, ina->x_host.c_host[5]);
729 ifp->if_init(ifp->if_softc);
734 ifp->if_init(ifp->if_softc);
743 sa = (struct sockaddr *) &ifr->ifr_data;
744 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
751 error = EAFNOSUPPORT;
753 switch (ifr->ifr_addr.sa_family) {
759 error = EAFNOSUPPORT;
767 * Set the interface MTU.
768 * mtu can't be larger than ARCMTU for RFC1051
769 * and can't be larger than ARC_PHDS_MTU
771 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
772 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
775 ifp->if_mtu = ifr->ifr_mtu;
782 /* based on ether_resolvemulti() */
784 arc_resolvemulti(ifp, llsa, sa)
786 struct sockaddr **llsa;
789 struct sockaddr_dl *sdl;
790 struct sockaddr_in *sin;
792 struct sockaddr_in6 *sin6;
795 switch(sa->sa_family) {
798 * No mapping needed. Just check that it's a valid MC address.
800 sdl = (struct sockaddr_dl *)sa;
801 if (*LLADDR(sdl) != ifp->if_broadcastaddr[0])
802 return EADDRNOTAVAIL;
807 sin = (struct sockaddr_in *)sa;
808 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
809 return EADDRNOTAVAIL;
810 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
812 sdl->sdl_len = sizeof *sdl;
813 sdl->sdl_family = AF_LINK;
814 sdl->sdl_index = ifp->if_index;
815 sdl->sdl_type = IFT_ARCNET;
816 sdl->sdl_alen = ARC_ADDR_LEN;
818 *llsa = (struct sockaddr *)sdl;
823 sin6 = (struct sockaddr_in6 *)sa;
824 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
826 * An IP6 address of 0 means listen to all
827 * of the Ethernet multicast address used for IP6.
828 * (This is used for multicast routers.)
830 ifp->if_flags |= IFF_ALLMULTI;
834 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
835 return EADDRNOTAVAIL;
836 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
838 sdl->sdl_len = sizeof *sdl;
839 sdl->sdl_family = AF_LINK;
840 sdl->sdl_index = ifp->if_index;
841 sdl->sdl_type = IFT_ARCNET;
842 sdl->sdl_alen = ARC_ADDR_LEN;
844 *llsa = (struct sockaddr *)sdl;
850 * Well, the text isn't quite right, but it's the name