NetBSD/sys/net/if_arcsubr.c

289 lines
7.4 KiB
C

/* $NetBSD: if_arcsubr.c,v 1.3 1995/04/14 17:06:39 chopps Exp $ */
/*
* Copyright (c) 1994, 1995 Ignatios Souvatzis
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/errno.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#include <netinet/if_arc.h>
u_char arcbroadcastaddr = 0;
#define senderr(e) { error = (e); goto bad;}
#define SIN(s) ((struct sockaddr_in *)s)
/*
* ARCnet output routine.
* Encapsulate a packet of type family for the local net.
* Assumes that ifp is actually pointer to arccom structure.
*/
int
arc_output(ifp, m0, dst, rt0)
register struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt0;
{
int s, error = 0;
u_char atype, adst;
register struct mbuf *m = m0;
register struct rtentry *rt;
struct mbuf *mcopy = (struct mbuf *)0;
register struct arc_header *ah;
int off, len = m->m_pkthdr.len;
struct arccom *ac = (struct arccom *)ifp;
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
ifp->if_lastchange = time;
if (rt = rt0) {
if ((rt->rt_flags & RTF_UP) == 0) {
if (rt0 = rt = rtalloc1(dst, 1))
rt->rt_refcnt--;
else
senderr(EHOSTUNREACH);
}
if (rt->rt_flags & RTF_GATEWAY) {
if (rt->rt_gwroute == 0)
goto lookup;
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
rtfree(rt); rt = rt0;
lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
time.tv_sec < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
/*
* For now, use the simple IP addr -> ARCnet addr mapping
*/
if (m->m_flags & M_BCAST)
adst = arcbroadcastaddr; /* ARCnet broadcast address */
else
adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
/* If broadcasting on a simplex interface, loopback a copy */
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
mcopy = m_copy(m, 0, (int)M_COPYALL);
off = m->m_pkthdr.len - m->m_len;
atype = ARCTYPE_IP_OLD;
break;
#endif
case AF_UNSPEC:
ah = (struct arc_header *)dst->sa_data;
adst = ah->arc_dhost;
atype = ah->arc_type;
break;
default:
printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (mcopy)
(void) looutput(ifp, mcopy, dst, rt);
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*
* For ARCnet, this is just symbolic. The header changes
* form and position on its way into the hardware and out of
* the wire. At this point, it contains source, destination and
* packet type.
*/
M_PREPEND(m, ARC_HDRLEN, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
ah = mtod(m, struct arc_header *);
ah->arc_type = atype;
ah->arc_dhost= adst;
ah->arc_shost= ac->ac_anaddr;
s = splimp();
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
splx(s);
senderr(ENOBUFS);
}
IF_ENQUEUE(&ifp->if_snd, m);
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
ifp->if_obytes += len + ARC_HDRLEN;
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received Arcnet packet;
* the packet is in the mbuf chain m with
* the ARCnet header.
*/
void
arc_input(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
register struct arc_header *ah;
register struct ifqueue *inq;
u_char atype;
int s;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
ah = mtod(m,struct arc_header *);
ifp->if_lastchange = time;
ifp->if_ibytes += m->m_pkthdr.len;
if (arcbroadcastaddr == ah->arc_dhost) {
m->m_flags |= M_BCAST;
ifp->if_imcasts++;
}
atype = ah->arc_type;
switch (atype) {
#ifdef INET
case ARCTYPE_IP_OLD:
m_adj(m,ARC_HDRLEN);
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
default:
m_freem(m);
return;
}
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Convert Arcnet address to printable (loggable) representation.
*/
static char digits[] = "0123456789abcdef";
char *
arc_sprintf(ap)
register u_char *ap;
{
static char arcbuf[3];
register char *cp = arcbuf;
*cp++ = digits[*ap >> 4];
*cp++ = digits[*ap++ & 0xf];
*cp = 0;
return (arcbuf);
}
/*
* Perform common duties while attaching to interface list
*/
void
arc_ifattach(ifp)
register struct ifnet *ifp;
{
register struct ifaddr *ifa;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ARCNET;
ifp->if_addrlen = 1;
ifp->if_hdrlen = ARC_HDRLEN;
ifp->if_mtu = ARCMTU;
if (((struct arccom *)ifp)->ac_anaddr == 0) {
log(LOG_ERR,"%s%d: link address 0 reserved for broadcasts.\n\
Please change it and ifconfig %s%d down up\n",
ifp->if_name,ifp->if_unit,ifp->if_name,ifp->if_unit);
}
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ARCNET;
sdl->sdl_alen = ifp->if_addrlen;
bcopy((caddr_t)&((struct arccom *)ifp)->ac_anaddr,
LLADDR(sdl), ifp->if_addrlen);
break;
}
}