77f82e3b7c
Avoid implicit function calls by adding the proper include files. Use const char copyright. Fix some fprint formatting. In the manual page: Use the .Pa macro for filenames and locations. Kill hard setence breaks. Make use of the .Tn and .Dq macros. Add some to text to the otherwise blank HISTORY section (taken from CVS).
232 lines
6.7 KiB
C
232 lines
6.7 KiB
C
/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 1995 John Hay. All rights reserved.
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*
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* This file includes significant work done at Cornell University by
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* Bill Nesheim. That work included by permission.
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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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* $FreeBSD$
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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/*
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* Routing Table Management Daemon
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*/
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#include <unistd.h>
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#include "defs.h"
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/*
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* Apply the function "f" to all non-passive
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* interfaces. If the interface supports the
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* use of broadcasting use it, otherwise address
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* the output to the known router.
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*/
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void
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toall(f, except, changesonly)
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void (*f)(struct sockaddr *, int, struct interface *, int);
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struct rt_entry *except;
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int changesonly;
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{
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register struct interface *ifp;
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register struct sockaddr *dst;
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register int flags;
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register struct rt_entry *trt;
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int onlist;
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extern struct interface *ifnet;
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if (ifp->int_flags & IFF_PASSIVE)
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continue;
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/*
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* Don't send it on interfaces in the except list.
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*/
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onlist = 0;
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trt = except;
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while(trt) {
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if (ifp == trt->rt_ifp) {
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onlist = 1;
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break;
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}
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trt = trt->rt_clone;
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}
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if (onlist)
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continue;
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dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
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ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
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&ifp->int_addr;
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flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
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(*f)(dst, flags, ifp, changesonly);
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}
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}
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/*
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* Output a preformed packet.
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*/
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void
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sndmsg(dst, flags, ifp, changesonly)
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struct sockaddr *dst;
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int flags;
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struct interface *ifp;
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int changesonly;
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{
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(*afswitch[dst->sa_family].af_output)
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(ripsock, flags, dst, sizeof (struct rip));
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TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
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}
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/*
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* Supply dst with the contents of the routing tables.
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* If this won't fit in one packet, chop it up into several.
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*
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* This must be done using the split horizon algorithm.
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* 1. Don't send routing info to the interface from where it was received.
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* 2. Don't publish an interface to itself.
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* 3. If a route is received from more than one interface and the cost is
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* the same, don't publish it on either interface. I am calling this
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* clones.
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*/
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void
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supply(dst, flags, ifp, changesonly)
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struct sockaddr *dst;
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int flags;
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struct interface *ifp;
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int changesonly;
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{
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register struct rt_entry *rt;
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register struct rt_entry *crt; /* Clone route */
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register struct rthash *rh;
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register struct netinfo *nn;
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register struct netinfo *n = msg->rip_nets;
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struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) dst;
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af_output_t *output = afswitch[dst->sa_family].af_output;
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int size, metric, ticks;
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union ipx_net net;
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int delay = 0;
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if (sipx->sipx_port == 0)
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sipx->sipx_port = htons(IPXPORT_RIP);
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msg->rip_cmd = ntohs(RIPCMD_RESPONSE);
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for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
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for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
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size = (char *)n - (char *)msg;
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if (size >= ((MAXRIPNETS * sizeof (struct netinfo)) +
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sizeof (msg->rip_cmd))) {
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(*output)(ripsock, flags, dst, size);
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TRACE_OUTPUT(ifp, dst, size);
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n = msg->rip_nets;
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delay++;
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if(delay == 2) {
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usleep(50000);
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delay = 0;
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}
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}
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if (changesonly && !(rt->rt_state & RTS_CHANGED))
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continue;
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/*
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* This should do rule one and two of the split horizon
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* algorithm.
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*/
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if (rt->rt_ifp == ifp)
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continue;
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/*
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* Rule 3.
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* Look if we have clones (different routes to the same
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* place with exactly the same cost).
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*
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* We should not publish on any of the clone interfaces.
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*/
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crt = rt->rt_clone;
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while (crt) {
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if (crt->rt_ifp == ifp)
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goto next;
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crt = crt->rt_clone;
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}
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sipx = (struct sockaddr_ipx *)&rt->rt_dst;
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if ((rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
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sipx = (struct sockaddr_ipx *)&rt->rt_router;
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if (rt->rt_metric == HOPCNT_INFINITY)
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metric = HOPCNT_INFINITY;
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else {
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metric = rt->rt_metric + 1;
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/*
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* We don't advertize routes with more than 15 hops.
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*/
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if (metric >= HOPCNT_INFINITY)
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continue;
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}
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/* XXX One day we should cater for slow interfaces also. */
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ticks = rt->rt_ticks + 1;
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net = sipx->sipx_addr.x_net;
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/*
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* Make sure that we don't put out a two net entries
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* for a pt to pt link (one for the G route, one for the if)
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* This is a kludge, and won't work if there are lots of nets.
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*/
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for (nn = msg->rip_nets; nn < n; nn++) {
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if (ipx_neteqnn(net, nn->rip_dst)) {
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if (ticks < ntohs(nn->rip_ticks)) {
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nn->rip_metric = htons(metric);
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nn->rip_ticks = htons(ticks);
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} else if ((ticks == ntohs(nn->rip_ticks)) &&
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(metric < ntohs(nn->rip_metric))) {
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nn->rip_metric = htons(metric);
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nn->rip_ticks = htons(ticks);
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}
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goto next;
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}
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}
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n->rip_dst = net;
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n->rip_metric = htons(metric);
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n->rip_ticks = htons(ticks);
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n++;
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next:;
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}
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if (n != msg->rip_nets) {
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size = (char *)n - (char *)msg;
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(*output)(ripsock, flags, dst, size);
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TRACE_OUTPUT(ifp, dst, size);
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}
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}
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