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/* $NetBSD: output.c,v 1.9 1995/06/20 22:27:54 christos Exp $ */
/*
* Copyright (c) 1983, 1988, 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/5/93";
#else
static char rcsid[] = "$NetBSD: output.c,v 1.9 1995/06/20 22:27:54 christos Exp $";
#endif
#endif /* not lint */
/*
* Routing Table Management Daemon
*/
#include "defs.h"
/*
* Apply the function "f" to all non-passive
* interfaces. If the interface supports the
* use of broadcasting use it, otherwise address
* the output to the known router.
*/
void
toall(f, rtstate, skipif)
void (*f) __P((struct sockaddr *, int, struct interface *, int));
int rtstate;
struct interface *skipif;
{
register struct interface *ifp;
register struct sockaddr *dst;
register int flags;
extern struct interface *ifnet;
for (ifp = ifnet; ifp; ifp = ifp->int_next) {
if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
continue;
dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
&ifp->int_addr;
flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
(*f)(dst, flags, ifp, rtstate);
}
}
/*
* Output a preformed packet.
*/
/*ARGSUSED*/
void
sndmsg(dst, flags, ifp, rtstate)
struct sockaddr *dst;
int flags;
struct interface *ifp;
int rtstate;
{
(*afswitch[dst->sa_family].af_output)(s, flags,
dst, sizeof (struct rip));
TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
}
/*
* Supply dst with the contents of the routing tables.
* If this won't fit in one packet, chop it up into several.
*/
void
supply(dst, flags, ifp, rtstate)
struct sockaddr *dst;
int flags;
struct interface *ifp;
int rtstate;
{
register struct rt_entry *rt;
register struct netinfo *n = msg->rip_nets;
register struct rthash *rh;
struct rthash *base = hosthash;
int doinghost = 1, size;
void (*output) __P((int, int, struct sockaddr *, int)) =
afswitch[dst->sa_family].af_output;
int (*sendroute) __P((struct rt_entry *, struct sockaddr *)) =
afswitch[dst->sa_family].af_sendroute;
int npackets = 0;
msg->rip_cmd = RIPCMD_RESPONSE;
msg->rip_vers = RIP_VERSION_1;
memset(msg->rip_res1, 0, sizeof(msg->rip_res1));
again:
for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
for (rt = rh->cqh_first; rt != (void *) rh; rt = rt->rt_entry.cqe_next) {
/*
* Don't resend the information on the network
* from which it was received (unless sending
* in response to a query).
*/
if (ifp && rt->rt_ifp == ifp &&
(rt->rt_state & RTS_INTERFACE) == 0)
continue;
if (rt->rt_state & RTS_EXTERNAL)
continue;
/*
* For dynamic updates, limit update to routes
* with the specified state.
*/
if (rtstate && (rt->rt_state & rtstate) == 0)
continue;
/*
* Limit the spread of subnet information
* to those who are interested.
*/
if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
if (rt->rt_dst.sa_family != dst->sa_family)
continue;
if ((*sendroute)(rt, dst) == 0)
continue;
}
size = (char *)n - packet;
if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
TRACE_OUTPUT(ifp, dst, size);
(*output)(s, flags, dst, size);
/*
* If only sending to ourselves,
* one packet is enough to monitor interface.
*/
if (ifp && (ifp->int_flags &
(IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
return;
n = msg->rip_nets;
npackets++;
}
(*afswitch[rt->rt_dst.sa_family].af_put)(n, &rt->rt_dst);
n->rip_metric = htonl(rt->rt_metric);
n++;
}
if (doinghost) {
doinghost = 0;
base = nethash;
goto again;
}
if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
size = (char *)n - packet;
TRACE_OUTPUT(ifp, dst, size);
(*output)(s, flags, dst, size);
}
}
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