2a27bd86e6
Note: The sources for XNSrouted and routed are being imported to usr.sbin instead of sbin.
140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 1985, 1993
|
|
* 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, 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
|
|
static char sccsid[] = "@(#)timer.c 8.1 (Berkeley) 6/5/93";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Routing Table Management Daemon
|
|
*/
|
|
#include "defs.h"
|
|
|
|
int timeval = -TIMER_RATE;
|
|
|
|
/*
|
|
* Timer routine. Performs routing information supply
|
|
* duties and manages timers on routing table entries.
|
|
*/
|
|
void
|
|
timer()
|
|
{
|
|
register struct rthash *rh;
|
|
register struct rt_entry *rt;
|
|
struct rthash *base = hosthash;
|
|
int doinghost = 1, timetobroadcast;
|
|
|
|
timeval += TIMER_RATE;
|
|
if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0)
|
|
ifinit();
|
|
timetobroadcast = supplier && (timeval % SUPPLY_INTERVAL) == 0;
|
|
again:
|
|
for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
|
|
rt = rh->rt_forw;
|
|
for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
|
|
/*
|
|
* We don't advance time on a routing entry for
|
|
* a passive gateway or that for our only interface.
|
|
* The latter is excused because we don't act as
|
|
* a routing information supplier and hence would
|
|
* time it out. This is fair as if it's down
|
|
* we're cut off from the world anyway and it's
|
|
* not likely we'll grow any new hardware in
|
|
* the mean time.
|
|
*/
|
|
if (!(rt->rt_state & RTS_PASSIVE) &&
|
|
(supplier || !(rt->rt_state & RTS_INTERFACE)))
|
|
rt->rt_timer += TIMER_RATE;
|
|
if (rt->rt_timer >= EXPIRE_TIME)
|
|
rt->rt_metric = HOPCNT_INFINITY;
|
|
if (rt->rt_timer >= GARBAGE_TIME) {
|
|
rt = rt->rt_back;
|
|
/* Perhaps we should send a REQUEST for this route? */
|
|
rtdelete(rt->rt_forw);
|
|
continue;
|
|
}
|
|
if (rt->rt_state & RTS_CHANGED) {
|
|
rt->rt_state &= ~RTS_CHANGED;
|
|
/* don't send extraneous packets */
|
|
if (!supplier || timetobroadcast)
|
|
continue;
|
|
msg->rip_cmd = htons(RIPCMD_RESPONSE);
|
|
msg->rip_nets[0].rip_dst =
|
|
(satons_addr(rt->rt_dst)).x_net;
|
|
msg->rip_nets[0].rip_metric =
|
|
htons(min(rt->rt_metric+1, HOPCNT_INFINITY));
|
|
toall(sndmsg);
|
|
}
|
|
}
|
|
}
|
|
if (doinghost) {
|
|
doinghost = 0;
|
|
base = nethash;
|
|
goto again;
|
|
}
|
|
if (timetobroadcast)
|
|
toall(supply);
|
|
alarm(TIMER_RATE);
|
|
}
|
|
|
|
/*
|
|
* On hangup, let everyone know we're going away.
|
|
*/
|
|
void
|
|
hup()
|
|
{
|
|
register struct rthash *rh;
|
|
register struct rt_entry *rt;
|
|
struct rthash *base = hosthash;
|
|
int doinghost = 1;
|
|
|
|
if (supplier) {
|
|
again:
|
|
for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
|
|
rt = rh->rt_forw;
|
|
for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw)
|
|
rt->rt_metric = HOPCNT_INFINITY;
|
|
}
|
|
if (doinghost) {
|
|
doinghost = 0;
|
|
base = nethash;
|
|
goto again;
|
|
}
|
|
toall(supply);
|
|
}
|
|
exit(1);
|
|
}
|