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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Routing Table Management Daemon
*/
#include "defs.h"
int supplyinterval; /* current supply interval */
/*
* Timer routine. Performs routing information supply
* duties and manages timers on routing table entries.
* Management of the RTS_CHANGED bit assumes that we multicast
* each time called.
*/
void
timer(void)
{
struct rthash *rh;
struct rt_entry *rt;
boolean_t timetomulticast = _B_FALSE;
int i;
static int iftime; /* interface timer */
static int mtime; /* periodic mcast supply timer */
static int alarmtime = 0; /* time elapsed since last call */
int mintime; /* tracks when next timer will expire */
/*
* On the initial call to timer(), the various times that are kept track
* of need to be initialized. After initializing everything, "remember"
* (via a static) how long until the next timer expires.
*/
if (alarmtime == 0) {
supplyinterval = GET_RANDOM(MIN_SUPPLY_TIME, MAX_SUPPLY_TIME);
iftime = 0;
mtime = supplyinterval;
alarmtime = supplyinterval;
(void) alarm(alarmtime);
return;
}
/*
* Initialize mintime to a suitable "large" value and then compare it to
* other times in the future to determine which event will occur next.
*/
mintime = INT_MAX;
(void) sighold(SIGHUP);
(void) sighold(SIGUSR1);
(void) sighold(SIGUSR2);
iftime += alarmtime;
if (iftime >= CHECK_INTERVAL) {
initifs();
iftime = 0;
}
mintime = min(mintime, CHECK_INTERVAL - iftime);
mtime += alarmtime;
if (mtime >= supplyinterval) {
if (supplier)
timetomulticast = _B_TRUE;
mtime = 0;
supplyinterval = GET_RANDOM(MIN_SUPPLY_TIME, MAX_SUPPLY_TIME);
}
mintime = min(mintime, supplyinterval - mtime);
for (i = IPV6_ABITS; i >= 0; i--) {
if (net_hashes[i] == NULL)
continue;
for (rh = net_hashes[i];
rh < &net_hashes[i][ROUTEHASHSIZ]; rh++) {
for (rt = rh->rt_forw; rt != (struct rt_entry *)rh;
rt = rt->rt_forw) {
/*
* We don't advance time on a routing entry for
* an interface because we catch
* interfaces going up and down in initifs.
*/
rt->rt_state &= ~RTS_CHANGED;
if ((rt->rt_state & RTS_INTERFACE) != 0)
continue;
rt->rt_timer += alarmtime;
if (rt->rt_timer >= GARBAGE_TIME) {
rt = rt->rt_back;
rtdelete(rt->rt_forw);
continue;
}
if (rt->rt_timer >= EXPIRE_TIME) {
rtdown(rt);
mintime = min(mintime,
GARBAGE_TIME - rt->rt_timer);
} else {
mintime = min(mintime,
EXPIRE_TIME - rt->rt_timer);
}
}
}
}
if (timetomulticast) {
supplyall(&allrouters, 0, (struct interface *)NULL, _B_TRUE);
(void) gettimeofday(&now, (struct timezone *)NULL);
lastmcast = now;
lastfullupdate = now;
needupdate = _B_FALSE; /* cancel any pending dynamic update */
nextmcast.tv_sec = 0;
}
(void) sigrelse(SIGUSR2);
(void) sigrelse(SIGUSR1);
(void) sigrelse(SIGHUP);
/*
* "Remember" (via a static) how long until the next timer expires.
*/
alarmtime = mintime;
(void) alarm(alarmtime);
}
/*
* On SIGTERM, let everyone know we're going away.
*/
void
term(void)
{
struct rthash *rh;
struct rt_entry *rt;
int i;
if (!supplier)
exit(EXIT_SUCCESS);
for (i = IPV6_ABITS; i >= 0; i--) {
if (net_hashes[i] == NULL)
continue;
for (rh = net_hashes[i]; rh < &net_hashes[i][ROUTEHASHSIZ];
rh++) {
for (rt = rh->rt_forw; rt != (struct rt_entry *)rh;
rt = rt->rt_forw) {
rt->rt_metric = HOPCNT_INFINITY;
}
}
}
supplyall(&allrouters, 0, (struct interface *)NULL, _B_TRUE);
(void) unlink(PATH_PID);
exit(EXIT_SUCCESS);
}
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