289 lines
7.4 KiB
C
289 lines
7.4 KiB
C
/* $NetBSD: if_arcsubr.c,v 1.3 1995/04/14 17:06:39 chopps 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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/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/socket.h>
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#include <sys/syslog.h>
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#include <sys/errno.h>
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#include <machine/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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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#endif
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#include <netinet/if_arc.h>
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u_char arcbroadcastaddr = 0;
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#define senderr(e) { error = (e); goto bad;}
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#define SIN(s) ((struct sockaddr_in *)s)
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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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int
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arc_output(ifp, m0, dst, rt0)
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register struct ifnet *ifp;
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struct mbuf *m0;
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struct sockaddr *dst;
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struct rtentry *rt0;
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{
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int s, error = 0;
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u_char atype, adst;
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register struct mbuf *m = m0;
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register struct rtentry *rt;
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struct mbuf *mcopy = (struct mbuf *)0;
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register struct arc_header *ah;
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int off, len = m->m_pkthdr.len;
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struct arccom *ac = (struct arccom *)ifp;
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
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senderr(ENETDOWN);
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ifp->if_lastchange = time;
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if (rt = rt0) {
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if ((rt->rt_flags & RTF_UP) == 0) {
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if (rt0 = rt = rtalloc1(dst, 1))
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rt->rt_refcnt--;
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else
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senderr(EHOSTUNREACH);
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}
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if (rt->rt_flags & RTF_GATEWAY) {
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if (rt->rt_gwroute == 0)
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goto lookup;
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if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
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rtfree(rt); rt = rt0;
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lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
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if ((rt = rt->rt_gwroute) == 0)
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senderr(EHOSTUNREACH);
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}
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}
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if (rt->rt_flags & RTF_REJECT)
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if (rt->rt_rmx.rmx_expire == 0 ||
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time.tv_sec < rt->rt_rmx.rmx_expire)
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senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
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}
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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)
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adst = arcbroadcastaddr; /* ARCnet broadcast address */
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else
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adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
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/* If broadcasting on a simplex interface, loopback a copy */
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if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
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mcopy = m_copy(m, 0, (int)M_COPYALL);
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off = m->m_pkthdr.len - m->m_len;
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atype = ARCTYPE_IP_OLD;
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break;
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#endif
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case AF_UNSPEC:
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ah = (struct arc_header *)dst->sa_data;
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adst = ah->arc_dhost;
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atype = ah->arc_type;
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break;
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default:
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printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
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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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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= ac->ac_anaddr;
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s = splimp();
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/*
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* Queue message on interface, and start output if interface
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* not yet active.
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*/
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if (IF_QFULL(&ifp->if_snd)) {
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IF_DROP(&ifp->if_snd);
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splx(s);
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senderr(ENOBUFS);
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}
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IF_ENQUEUE(&ifp->if_snd, m);
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if ((ifp->if_flags & IFF_OACTIVE) == 0)
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(*ifp->if_start)(ifp);
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splx(s);
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ifp->if_obytes += len + ARC_HDRLEN;
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return (error);
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bad:
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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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* 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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void
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arc_input(ifp, m)
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struct ifnet *ifp;
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struct mbuf *m;
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{
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register struct arc_header *ah;
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register struct ifqueue *inq;
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u_char atype;
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int s;
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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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ah = mtod(m,struct arc_header *);
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ifp->if_lastchange = time;
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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;
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ifp->if_imcasts++;
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}
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atype = ah->arc_type;
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switch (atype) {
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#ifdef INET
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case ARCTYPE_IP_OLD:
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m_adj(m,ARC_HDRLEN);
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schednetisr(NETISR_IP);
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inq = &ipintrq;
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break;
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#endif
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default:
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m_freem(m);
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return;
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}
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s = splimp();
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if (IF_QFULL(inq)) {
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IF_DROP(inq);
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m_freem(m);
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} else
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IF_ENQUEUE(inq, m);
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splx(s);
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}
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/*
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* Convert Arcnet address to printable (loggable) representation.
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*/
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static char digits[] = "0123456789abcdef";
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char *
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arc_sprintf(ap)
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register u_char *ap;
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{
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static char arcbuf[3];
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register char *cp = arcbuf;
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*cp++ = digits[*ap >> 4];
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*cp++ = digits[*ap++ & 0xf];
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*cp = 0;
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return (arcbuf);
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}
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/*
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* Perform common duties while attaching to interface list
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*/
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void
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arc_ifattach(ifp)
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register struct ifnet *ifp;
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{
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register struct ifaddr *ifa;
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register struct sockaddr_dl *sdl;
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ifp->if_type = IFT_ARCNET;
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ifp->if_addrlen = 1;
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ifp->if_hdrlen = ARC_HDRLEN;
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ifp->if_mtu = ARCMTU;
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if (((struct arccom *)ifp)->ac_anaddr == 0) {
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log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts.\n\
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Please change it and ifconfig %s%d down up\n",
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ifp->if_name,ifp->if_unit,ifp->if_name,ifp->if_unit);
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}
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for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
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if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
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sdl->sdl_family == AF_LINK) {
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sdl->sdl_type = IFT_ARCNET;
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sdl->sdl_alen = ifp->if_addrlen;
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bcopy((caddr_t)&((struct arccom *)ifp)->ac_anaddr,
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LLADDR(sdl), ifp->if_addrlen);
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break;
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}
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}
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