XNSrouted/af.c

/*
 * Copyright (c) 1985 The Regents of the University of California.
 * 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 are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)af.c        5.8 (Berkeley) 9/19/88";
#endif /* not lint */

#include "defs.h"

/*
 * Address family support routines
 */
int     null_hash(), null_netmatch(), null_output(),
        null_portmatch(), null_portcheck(),
        null_checkhost(), null_ishost(), null_canon();
int     xnnet_hash(), xnnet_netmatch(), xnnet_output(),
        xnnet_portmatch(),
        xnnet_checkhost(), xnnet_ishost(), xnnet_canon();
#define NIL \
        { null_hash,            null_netmatch,          null_output, \
          null_portmatch,       null_portcheck,         null_checkhost, \
          null_ishost,          null_canon }
#define XNSNET \
        { xnnet_hash,           xnnet_netmatch,         xnnet_output, \
          xnnet_portmatch,      xnnet_portmatch,        xnnet_checkhost, \
          xnnet_ishost,         xnnet_canon }

struct afswitch afswitch[AF_MAX] =
        { NIL, NIL, NIL, NIL, NIL, NIL, XNSNET, NIL, NIL, NIL, NIL };

struct sockaddr_ns xnnet_default = { AF_NS };

union ns_net ns_anynet;
union ns_net ns_zeronet;

xnnet_hash(sns, hp)
        register struct sockaddr_ns *sns;
        struct afhash *hp;
{
        register long hash = 0;
        register u_short *s = sns->sns_addr.x_host.s_host;
        union ns_net_u net;

        net.net_e = sns->sns_addr.x_net;
        hp->afh_nethash = net.long_e;
        hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
        hp->afh_hosthash = hash;
}

xnnet_netmatch(sxn1, sxn2)
        struct sockaddr_ns *sxn1, *sxn2;
{
        return (ns_neteq(sxn1->sns_addr, sxn2->sns_addr));
}

/*
 * Verify the message is from the right port.
 */
xnnet_portmatch(sns)
        register struct sockaddr_ns *sns;
{

        return (ntohs(sns->sns_addr.x_port) == IDPPORT_RIF );
}


/*
 * xns output routine.
 */
#ifdef DEBUG
int do_output = 0;
#endif
xnnet_output(flags, sns, size)
        int flags;
        struct sockaddr_ns *sns;
        int size;
{
        struct sockaddr_ns dst;

        dst = *sns;
        sns = &dst;
        if (sns->sns_addr.x_port == 0)
                sns->sns_addr.x_port = htons(IDPPORT_RIF);
#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 (ns_neteqnn(sns->sns_addr.x_net, ns_zeronet)) {
                extern  struct interface *ifnet;
                register struct interface *ifp;

                for (ifp = ifnet; ifp; ifp = ifp->int_next) {
                        sns->sns_addr.x_net =
                                satons_addr(ifp->int_addr).x_net;
                        (void) sendto(s, msg, size, flags, sns, sizeof (*sns));
                }
                return;
        }

        (void) sendto(s, msg, size, flags, sns, sizeof (*sns));
}

/*
 * Return 1 if we want this route.
 * We use this to disallow route net G entries for one for multiple
 * point to point links.
 */
xnnet_checkhost(sns)
        struct sockaddr_ns *sns;
{
        register struct interface *ifp = if_ifwithnet(sns);
        /*
         * 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.
 */
xnnet_ishost(sns)
struct sockaddr_ns *sns;
{
        register u_short *s = sns->sns_addr.x_host.s_host;

        if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
                return (0);
        else
                return (1);
}

xnnet_canon(sns)
        struct sockaddr_ns *sns;
{

        sns->sns_addr.x_port = 0;
}

/*ARGSUSED*/
null_hash(addr, hp)
        struct sockaddr *addr;
        struct afhash *hp;
{

        hp->afh_nethash = hp->afh_hosthash = 0;
}

/*ARGSUSED*/
null_netmatch(a1, a2)
        struct sockaddr *a1, *a2;
{

        return (0);
}

/*ARGSUSED*/
null_output(s, f, a1, n)
        int s, f;
        struct sockaddr *a1;
        int n;
{

        ;
}

/*ARGSUSED*/
null_portmatch(a1)
        struct sockaddr *a1;
{

        return (0);
}

/*ARGSUSED*/
null_portcheck(a1)
        struct sockaddr *a1;
{

        return (0);
}

/*ARGSUSED*/
null_ishost(a1)
        struct sockaddr *a1;
{

        return (0);
}

/*ARGSUSED*/
null_checkhost(a1)
        struct sockaddr *a1;
{

        return (0);
}

/*ARGSUSED*/
null_canon(a1)
        struct sockaddr *a1;
{

        ;
}