639 lines
14 KiB
C
639 lines
14 KiB
C
/* $NetBSD: if_arcsubr.c,v 1.83 2021/06/16 00:21:19 riastradh Exp $ */
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/*
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* Copyright (c) 1994, 1995 Ignatios Souvatzis
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
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* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_arcsubr.c,v 1.83 2021/06/16 00:21:19 riastradh Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/cpu.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_arc.h>
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#include <net/if_arp.h>
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#include <net/if_ether.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/if_inarp.h>
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#endif
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <netinet6/nd6.h>
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#endif
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#define ARCNET_ALLOW_BROKEN_ARP
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#ifndef ARC_IPMTU
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#define ARC_IPMTU 1500
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#endif
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static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *);
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/*
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* RC1201 requires us to have this configurable. We have it only per
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* machine at the moment... there is no generic "set mtu" ioctl, AFAICS.
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* Anyway, it is possible to binpatch this or set it per kernel config
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* option.
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*/
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#if ARC_IPMTU > 60480
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ERROR: The arc_ipmtu is ARC_IPMTU, but must not exceed 60480.
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#endif
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int arc_ipmtu = ARC_IPMTU;
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uint8_t arcbroadcastaddr = 0;
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#define senderr(e) { error = (e); goto bad;}
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static int arc_output(struct ifnet *, struct mbuf *,
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const struct sockaddr *, const struct rtentry *);
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static void arc_input(struct ifnet *, struct mbuf *);
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/*
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* ARCnet output routine.
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* Encapsulate a packet of type family for the local net.
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* Assumes that ifp is actually pointer to arccom structure.
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*/
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static int
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arc_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
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const struct rtentry *rt)
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{
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struct mbuf *m, *m1, *mcopy;
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struct arccom *ac;
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const struct arc_header *cah;
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struct arc_header *ah;
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struct arphdr *arph;
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int error, newencoding;
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uint8_t atype, adst, myself;
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int tfrags, sflag, fsflag, rsflag;
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
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return (ENETDOWN); /* m, m1 aren't initialized yet */
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error = newencoding = 0;
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ac = (struct arccom *)ifp;
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m = m0;
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mcopy = m1 = NULL;
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myself = *CLLADDR(ifp->if_sadl);
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/*
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* if the queueing discipline needs packet classification,
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* do it before prepending link headers.
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*/
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IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family);
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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/*
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* For now, use the simple IP addr -> ARCnet addr mapping
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*/
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if (m->m_flags & (M_BCAST|M_MCAST))
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adst = arcbroadcastaddr; /* ARCnet broadcast address */
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else if (ifp->if_flags & IFF_NOARP)
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adst = ntohl(satocsin(dst)->sin_addr.s_addr) & 0xFF;
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else if ((error = arpresolve(ifp, rt, m, dst, &adst,
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sizeof(adst))) != 0)
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return error == EWOULDBLOCK ? 0 : error;
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/* If broadcasting on a simplex interface, loopback a copy */
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if ((m->m_flags & (M_BCAST|M_MCAST)) &&
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(ifp->if_flags & IFF_SIMPLEX))
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mcopy = m_copypacket(m, M_DONTWAIT);
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if (ifp->if_flags & IFF_LINK0) {
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atype = ARCTYPE_IP;
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newencoding = 1;
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} else {
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atype = ARCTYPE_IP_OLD;
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newencoding = 0;
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}
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break;
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case AF_ARP:
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arph = mtod(m, struct arphdr *);
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if (m->m_flags & M_BCAST)
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adst = arcbroadcastaddr;
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else {
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uint8_t *tha = ar_tha(arph);
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if (tha == NULL) {
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m_freem(m);
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return 0;
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}
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adst = *tha;
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}
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arph->ar_hrd = htons(ARPHRD_ARCNET);
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switch (ntohs(arph->ar_op)) {
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case ARPOP_REVREQUEST:
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case ARPOP_REVREPLY:
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if (!(ifp->if_flags & IFF_LINK0)) {
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printf("%s: can't handle af%d\n",
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ifp->if_xname, dst->sa_family);
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senderr(EAFNOSUPPORT);
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}
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atype = htons(ARCTYPE_REVARP);
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newencoding = 1;
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break;
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case ARPOP_REQUEST:
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case ARPOP_REPLY:
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default:
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if (ifp->if_flags & IFF_LINK0) {
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atype = htons(ARCTYPE_ARP);
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newencoding = 1;
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} else {
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atype = htons(ARCTYPE_ARP_OLD);
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newencoding = 0;
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}
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}
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#ifdef ARCNET_ALLOW_BROKEN_ARP
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/*
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* XXX It's not clear per RFC826 if this is needed, but
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* "assigned numbers" say this is wrong.
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* However, e.g., AmiTCP 3.0Beta used it... we make this
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* switchable for emergency cases. Not perfect, but...
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*/
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if (ifp->if_flags & IFF_LINK2)
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arph->ar_pro = atype - 1;
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#endif
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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if (m->m_flags & M_MCAST) {
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adst = 0;
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} else {
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error = nd6_resolve(ifp, rt, m, dst, &adst,
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sizeof(adst));
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if (error != 0)
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return error == EWOULDBLOCK ? 0 : error;
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}
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atype = htons(ARCTYPE_INET6);
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newencoding = 1;
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break;
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#endif
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case AF_UNSPEC:
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cah = (const struct arc_header *)dst->sa_data;
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adst = cah->arc_dhost;
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atype = cah->arc_type;
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break;
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default:
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printf("%s: can't handle af%d\n", ifp->if_xname,
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dst->sa_family);
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senderr(EAFNOSUPPORT);
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}
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if (mcopy)
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(void) looutput(ifp, mcopy, dst, rt);
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/*
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* Add local net header. If no space in first mbuf,
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* allocate another.
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*
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* For ARCnet, this is just symbolic. The header changes
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* form and position on its way into the hardware and out of
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* the wire. At this point, it contains source, destination and
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* packet type.
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*/
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if (newencoding) {
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++ac->ac_seqid; /* make the seqid unique */
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tfrags = (m->m_pkthdr.len + 503) / 504;
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fsflag = 2 * tfrags - 3;
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sflag = 0;
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rsflag = fsflag;
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while (sflag < fsflag) {
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/* we CAN'T have short packets here */
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m1 = m_split(m, 504, M_DONTWAIT);
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if (m1 == 0)
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senderr(ENOBUFS);
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M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ah = mtod(m, struct arc_header *);
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ah->arc_type = atype;
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ah->arc_dhost = adst;
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ah->arc_shost = myself;
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ah->arc_flag = rsflag;
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ah->arc_seqid = ac->ac_seqid;
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if ((error = ifq_enqueue(ifp, m)) != 0)
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return (error);
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m = m1;
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sflag += 2;
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rsflag = sflag;
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}
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m1 = NULL;
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/* here we can have small, especially forbidden packets */
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if ((m->m_pkthdr.len >=
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ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
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(m->m_pkthdr.len <=
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ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
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M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ah = mtod(m, struct arc_header *);
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ah->arc_flag = 0xFF;
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ah->arc_seqid = 0xFFFF;
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ah->arc_type2 = atype;
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ah->arc_flag2 = sflag;
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ah->arc_seqid2 = ac->ac_seqid;
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} else {
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M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ah = mtod(m, struct arc_header *);
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ah->arc_flag = sflag;
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ah->arc_seqid = ac->ac_seqid;
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}
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ah->arc_dhost = adst;
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ah->arc_shost = myself;
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ah->arc_type = atype;
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} else {
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M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ah = mtod(m, struct arc_header *);
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ah->arc_type = atype;
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ah->arc_dhost = adst;
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ah->arc_shost = myself;
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}
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return ifq_enqueue(ifp, m);
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bad:
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if (m1)
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m_freem(m1);
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if (m)
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m_freem(m);
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return (error);
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}
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/*
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* Defragmenter. Returns mbuf if last packet found, else
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* NULL. frees imcoming mbuf as necessary.
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*/
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static struct mbuf *
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arc_defrag(struct ifnet *ifp, struct mbuf *m)
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{
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struct arc_header *ah, *ah1;
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struct arccom *ac;
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struct ac_frag *af;
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struct mbuf *m1;
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const char *s;
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int newflen;
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u_char src, dst, typ;
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ac = (struct arccom *)ifp;
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if (m->m_len < ARC_HDRNEWLEN) {
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m = m_pullup(m, ARC_HDRNEWLEN);
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if (m == NULL) {
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if_statinc(ifp, if_ierrors);
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return NULL;
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}
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}
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ah = mtod(m, struct arc_header *);
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typ = ah->arc_type;
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if (!arc_isphds(typ))
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return m;
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src = ah->arc_shost;
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dst = ah->arc_dhost;
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if (ah->arc_flag == 0xff) {
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m_adj(m, 4);
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if (m->m_len < ARC_HDRNEWLEN) {
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m = m_pullup(m, ARC_HDRNEWLEN);
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if (m == NULL) {
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if_statinc(ifp, if_ierrors);
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return NULL;
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}
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}
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ah = mtod(m, struct arc_header *);
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}
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af = &ac->ac_fragtab[src];
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m1 = af->af_packet;
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s = "debug code error";
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if (ah->arc_flag & 1) {
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/*
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* first fragment. We always initialize, which is
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* about the right thing to do, as we only want to
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* accept one fragmented packet per src at a time.
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*/
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if (m1 != NULL)
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m_freem(m1);
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af->af_packet = m;
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m1 = m;
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af->af_maxflag = ah->arc_flag;
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af->af_lastseen = 0;
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af->af_seqid = ah->arc_seqid;
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return NULL;
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/* notreached */
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} else {
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/* check for unfragmented packet */
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if (ah->arc_flag == 0)
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return m;
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/* do we have a first packet from that src? */
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if (m1 == NULL) {
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s = "no first frag";
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goto outofseq;
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}
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ah1 = mtod(m1, struct arc_header *);
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if (ah->arc_seqid != ah1->arc_seqid) {
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s = "seqid differs";
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goto outofseq;
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}
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if (typ != ah1->arc_type) {
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s = "type differs";
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goto outofseq;
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}
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if (dst != ah1->arc_dhost) {
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s = "dest host differs";
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goto outofseq;
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}
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/* typ, seqid and dst are ok here. */
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if (ah->arc_flag == af->af_lastseen) {
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m_freem(m);
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return NULL;
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}
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if (ah->arc_flag == af->af_lastseen + 2) {
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/* ok, this is next fragment */
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af->af_lastseen = ah->arc_flag;
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m_adj(m, ARC_HDRNEWLEN);
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/*
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* m_cat might free the first mbuf (with pkthdr)
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* in 2nd chain; therefore:
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*/
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newflen = m->m_pkthdr.len;
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m_cat(m1, m);
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m1->m_pkthdr.len += newflen;
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/* is it the last one? */
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if (af->af_lastseen > af->af_maxflag) {
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af->af_packet = NULL;
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return (m1);
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} else
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return NULL;
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}
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s = "other reason";
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/* if all else fails, it is out of sequence, too */
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}
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outofseq:
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if (m1) {
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m_freem(m1);
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af->af_packet = NULL;
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}
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if (m)
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m_freem(m);
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log(LOG_INFO,"%s: got out of seq. packet: %s\n",
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ifp->if_xname, s);
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return NULL;
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}
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/*
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* return 1 if Packet Header Definition Standard, else 0.
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* For now: old IP, old ARP aren't obviously. Lacking correct information,
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* we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
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* (Apple and Novell corporations were involved, among others, in PHDS work).
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* Easiest is to assume that everybody else uses that, too.
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*/
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int
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arc_isphds(uint8_t type)
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{
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return (type != ARCTYPE_IP_OLD &&
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type != ARCTYPE_ARP_OLD &&
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type != ARCTYPE_DIAGNOSE);
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}
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/*
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* Process a received Arcnet packet;
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* the packet is in the mbuf chain m with
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* the ARCnet header.
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*/
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static void
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arc_input(struct ifnet *ifp, struct mbuf *m)
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{
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pktqueue_t *pktq = NULL;
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struct arc_header *ah;
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struct ifqueue *inq;
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uint8_t atype;
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int isr = 0;
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if ((ifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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return;
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}
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/* possibly defragment: */
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m = arc_defrag(ifp, m);
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if (m == NULL)
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return;
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ah = mtod(m, struct arc_header *);
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if_statadd(ifp, if_ibytes, m->m_pkthdr.len);
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if (arcbroadcastaddr == ah->arc_dhost) {
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m->m_flags |= M_BCAST|M_MCAST;
|
|
if_statinc(ifp, if_imcasts);
|
|
}
|
|
|
|
atype = ah->arc_type;
|
|
switch (atype) {
|
|
#ifdef INET
|
|
case ARCTYPE_IP:
|
|
m_adj(m, ARC_HDRNEWLEN);
|
|
pktq = ip_pktq;
|
|
break;
|
|
|
|
case ARCTYPE_IP_OLD:
|
|
m_adj(m, ARC_HDRLEN);
|
|
pktq = ip_pktq;
|
|
break;
|
|
|
|
case ARCTYPE_ARP:
|
|
m_adj(m, ARC_HDRNEWLEN);
|
|
isr = NETISR_ARP;
|
|
inq = &arpintrq;
|
|
#ifdef ARCNET_ALLOW_BROKEN_ARP
|
|
mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
|
|
#endif
|
|
break;
|
|
|
|
case ARCTYPE_ARP_OLD:
|
|
m_adj(m, ARC_HDRLEN);
|
|
isr = NETISR_ARP;
|
|
inq = &arpintrq;
|
|
#ifdef ARCNET_ALLOW_BROKEN_ARP
|
|
mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
|
|
#endif
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case ARCTYPE_INET6:
|
|
m_adj(m, ARC_HDRNEWLEN);
|
|
pktq = ip6_pktq;
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (__predict_true(pktq)) {
|
|
if (__predict_false(!pktq_enqueue(pktq, m, 0))) {
|
|
m_freem(m);
|
|
}
|
|
return;
|
|
}
|
|
|
|
IFQ_ENQUEUE_ISR(inq, m, isr);
|
|
}
|
|
|
|
/*
|
|
* Convert Arcnet address to printable (loggable) representation.
|
|
*/
|
|
char *
|
|
arc_sprintf(uint8_t *ap)
|
|
{
|
|
static char arcbuf[3];
|
|
char *cp = arcbuf;
|
|
|
|
*cp++ = hexdigits[*ap >> 4];
|
|
*cp++ = hexdigits[*ap++ & 0xf];
|
|
*cp = 0;
|
|
return (arcbuf);
|
|
}
|
|
|
|
/*
|
|
* Perform common duties while attaching to interface list
|
|
*/
|
|
int
|
|
arc_ifattach(struct ifnet *ifp, uint8_t lla)
|
|
{
|
|
struct arccom *ac;
|
|
|
|
ifp->if_type = IFT_ARCNET;
|
|
ifp->if_addrlen = 1;
|
|
ifp->if_hdrlen = ARC_HDRLEN;
|
|
ifp->if_dlt = DLT_ARCNET;
|
|
if (ifp->if_flags & IFF_BROADCAST)
|
|
ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
|
|
if (ifp->if_flags & IFF_LINK0 && arc_ipmtu > ARC_PHDS_MAXMTU)
|
|
log(LOG_ERR,
|
|
"%s: arc_ipmtu is %d, but must not exceed %d\n",
|
|
ifp->if_xname, arc_ipmtu, ARC_PHDS_MAXMTU);
|
|
|
|
ifp->if_output = arc_output;
|
|
ifp->_if_input = arc_input;
|
|
ac = (struct arccom *)ifp;
|
|
ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
|
|
if (lla == 0) {
|
|
/* XXX this message isn't entirely clear, to me -- cgd */
|
|
log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
|
|
ifp->if_xname, ifp->if_xname);
|
|
}
|
|
if_attach(ifp);
|
|
|
|
if_set_sadl(ifp, &lla, sizeof(lla), true);
|
|
|
|
ifp->if_broadcastaddr = &arcbroadcastaddr;
|
|
|
|
bpf_attach(ifp, DLT_ARCNET, ARC_HDRLEN);
|
|
|
|
return 0;
|
|
}
|