FreeBSD-5.3/usr.sbin/IPXrouted/af.c
/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1995 John Hay. All rights reserved.
*
* This file includes significant work done at Cornell University by
* Bill Nesheim. That work included by permission.
*
* 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.
* 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.
*
* $FreeBSD: src/usr.sbin/IPXrouted/af.c,v 1.8 2004/08/07 04:19:37 imp Exp $
*/
#ifndef lint
static const char sccsid[] = "@(#)af.c 8.1 (Berkeley) 6/5/93";
#endif /* not lint */
#include "defs.h"
/*
* Address family support routines
*/
af_hash_t null_hash;
af_netmatch_t null_netmatch;
af_output_t null_output;
af_portmatch_t null_portmatch;
af_portcheck_t null_portcheck;
af_checkhost_t null_checkhost;
af_ishost_t null_ishost;
af_canon_t null_canon;
void ipxnet_hash(struct sockaddr_ipx *, struct afhash *);
int ipxnet_netmatch(struct sockaddr_ipx *, struct sockaddr_ipx *);
void ipxnet_output(int, int, struct sockaddr_ipx *, int);
int ipxnet_portmatch(struct sockaddr_ipx *);
int ipxnet_checkhost(struct sockaddr_ipx *);
int ipxnet_ishost(struct sockaddr_ipx *);
void ipxnet_canon(struct sockaddr_ipx *);
#define NIL \
{ null_hash, null_netmatch, null_output, \
null_portmatch, null_portcheck, null_checkhost, \
null_ishost, null_canon }
#define IPXNET \
{ (af_hash_t *)ipxnet_hash, \
(af_netmatch_t *)ipxnet_netmatch, \
(af_output_t *)ipxnet_output, \
(af_portmatch_t *)ipxnet_portmatch, \
(af_portcheck_t *)ipxnet_portmatch, \
(af_checkhost_t *)ipxnet_checkhost, \
(af_ishost_t *)ipxnet_ishost, \
(af_canon_t *)ipxnet_canon }
struct afswitch afswitch[AF_MAX] =
{ NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL,
NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL, NIL,
NIL, NIL, NIL, IPXNET, NIL, NIL };
struct sockaddr_ipx ipxnet_default = { sizeof(struct sockaddr_ipx), AF_IPX };
union ipx_net ipx_anynet;
union ipx_net ipx_zeronet;
void
ipxnet_hash(sipx, hp)
register struct sockaddr_ipx *sipx;
struct afhash *hp;
{
long hash;
#if 0
u_short *s = sipx->sipx_addr.x_host.s_host;
#endif
u_char *c;
c = sipx->sipx_addr.x_net.c_net;
#define IMVAL 33
hash = 0;
hash = hash * IMVAL + *c++;
hash = hash * IMVAL + *c++;
hash = hash * IMVAL + *c++;
hash = hash * IMVAL + *c++;
#undef IMVAL
hp->afh_nethash = hash;
hp->afh_nethash ^= (hash >> 8);
hp->afh_nethash ^= (hash >> 16);
hp->afh_nethash ^= (hash >> 24);
#if 0
hash = 0;
hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
hp->afh_hosthash = hash;
#endif
}
int
ipxnet_netmatch(sxn1, sxn2)
struct sockaddr_ipx *sxn1, *sxn2;
{
return (ipx_neteq(sxn1->sipx_addr, sxn2->sipx_addr));
}
/*
* Verify the message is from the right port.
*/
int
ipxnet_portmatch(sipx)
register struct sockaddr_ipx *sipx;
{
return (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP );
}
/*
* ipx output routine.
*/
#ifdef DEBUG
int do_output = 0;
#endif
void
ipxnet_output(s, flags, sipx, size)
int s;
int flags;
struct sockaddr_ipx *sipx;
int size;
{
struct sockaddr_ipx dst;
dst = *sipx;
sipx = &dst;
if (sipx->sipx_addr.x_port == 0)
sipx->sipx_addr.x_port = htons(IPXPORT_RIP);
#ifdef DEBUG
if(do_output || ntohs(msg->rip_cmd) == RIPCMD_REQUEST)
#endif
/*
* Kludge to allow us to get routes out to machines that
* don't know their addresses yet; send to that address on
* ALL connected nets
*/
if (ipx_neteqnn(sipx->sipx_addr.x_net, ipx_zeronet)) {
extern struct interface *ifnet;
register struct interface *ifp;
for (ifp = ifnet; ifp; ifp = ifp->int_next) {
sipx->sipx_addr.x_net =
satoipx_addr(ifp->int_addr).x_net;
(void) sendto(s, msg, size, flags,
(struct sockaddr *)sipx, sizeof (*sipx));
}
return;
}
(void) sendto(s, msg, size, flags,
(struct sockaddr *)sipx, sizeof (*sipx));
}
/*
* Return 1 if we want this route.
* We use this to disallow route net G entries for one for multiple
* point to point links.
*/
int
ipxnet_checkhost(sipx)
struct sockaddr_ipx *sipx;
{
register struct interface *ifp = if_ifwithnet((struct sockaddr *)sipx);
/*
* We want this route if there is no more than one
* point to point interface with this network.
*/
if (ifp == 0 || (ifp->int_flags & IFF_POINTOPOINT)==0) return (1);
return (ifp->int_sq.n == ifp->int_sq.p);
}
/*
* Return 1 if the address is
* for a host, 0 for a network.
*/
int
ipxnet_ishost(sipx)
struct sockaddr_ipx *sipx;
{
register u_short *s = sipx->sipx_addr.x_host.s_host;
if ((s[0]==0x0000) && (s[1]==0x0000) && (s[2]==0x0000))
return (0);
if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
return (0);
return (1);
}
void
ipxnet_canon(sipx)
struct sockaddr_ipx *sipx;
{
sipx->sipx_addr.x_port = 0;
}
void
null_hash(addr, hp)
struct sockaddr *addr;
struct afhash *hp;
{
hp->afh_nethash = hp->afh_hosthash = 0;
}
int
null_netmatch(a1, a2)
struct sockaddr *a1, *a2;
{
return (0);
}
void
null_output(s, f, a1, n)
int s;
int f;
struct sockaddr *a1;
int n;
{
;
}
int
null_portmatch(a1)
struct sockaddr *a1;
{
return (0);
}
int
null_portcheck(a1)
struct sockaddr *a1;
{
return (0);
}
int
null_ishost(a1)
struct sockaddr *a1;
{
return (0);
}
int
null_checkhost(a1)
struct sockaddr *a1;
{
return (0);
}
void
null_canon(a1)
struct sockaddr *a1;
{
;
}