1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
29*7c478bd9Sstevel@tonic-gate 
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
32*7c478bd9Sstevel@tonic-gate  * under license from the Regents of the University of California.
33*7c478bd9Sstevel@tonic-gate  */
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
36*7c478bd9Sstevel@tonic-gate 
37*7c478bd9Sstevel@tonic-gate /*
38*7c478bd9Sstevel@tonic-gate  * Routing Table Management Daemon
39*7c478bd9Sstevel@tonic-gate  */
40*7c478bd9Sstevel@tonic-gate #include "defs.h"
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate int supplyinterval;			/* current supply interval */
43*7c478bd9Sstevel@tonic-gate 
44*7c478bd9Sstevel@tonic-gate /*
45*7c478bd9Sstevel@tonic-gate  * Timer routine.  Performs routing information supply
46*7c478bd9Sstevel@tonic-gate  * duties and manages timers on routing table entries.
47*7c478bd9Sstevel@tonic-gate  * Management of the RTS_CHANGED bit assumes that we multicast
48*7c478bd9Sstevel@tonic-gate  * each time called.
49*7c478bd9Sstevel@tonic-gate  */
50*7c478bd9Sstevel@tonic-gate void
timer(void)51*7c478bd9Sstevel@tonic-gate timer(void)
52*7c478bd9Sstevel@tonic-gate {
53*7c478bd9Sstevel@tonic-gate 	struct rthash *rh;
54*7c478bd9Sstevel@tonic-gate 	struct rt_entry *rt;
55*7c478bd9Sstevel@tonic-gate 	boolean_t timetomulticast = _B_FALSE;
56*7c478bd9Sstevel@tonic-gate 	int i;
57*7c478bd9Sstevel@tonic-gate 	static int iftime;		/* interface timer */
58*7c478bd9Sstevel@tonic-gate 	static int mtime;		/* periodic mcast supply timer */
59*7c478bd9Sstevel@tonic-gate 	static int alarmtime = 0;	/* time elapsed since last call */
60*7c478bd9Sstevel@tonic-gate 	int mintime;			/* tracks when next timer will expire */
61*7c478bd9Sstevel@tonic-gate 
62*7c478bd9Sstevel@tonic-gate 	/*
63*7c478bd9Sstevel@tonic-gate 	 * On the initial call to timer(), the various times that are kept track
64*7c478bd9Sstevel@tonic-gate 	 * of need to be initialized.  After initializing everything, "remember"
65*7c478bd9Sstevel@tonic-gate 	 * (via a static) how long until the next timer expires.
66*7c478bd9Sstevel@tonic-gate 	 */
67*7c478bd9Sstevel@tonic-gate 	if (alarmtime == 0) {
68*7c478bd9Sstevel@tonic-gate 		supplyinterval = GET_RANDOM(MIN_SUPPLY_TIME, MAX_SUPPLY_TIME);
69*7c478bd9Sstevel@tonic-gate 		iftime = 0;
70*7c478bd9Sstevel@tonic-gate 		mtime = supplyinterval;
71*7c478bd9Sstevel@tonic-gate 		alarmtime = supplyinterval;
72*7c478bd9Sstevel@tonic-gate 		(void) alarm(alarmtime);
73*7c478bd9Sstevel@tonic-gate 		return;
74*7c478bd9Sstevel@tonic-gate 	}
75*7c478bd9Sstevel@tonic-gate 
76*7c478bd9Sstevel@tonic-gate 	/*
77*7c478bd9Sstevel@tonic-gate 	 * Initialize mintime to a suitable "large" value and then compare it to
78*7c478bd9Sstevel@tonic-gate 	 * other times in the future to determine which event will occur next.
79*7c478bd9Sstevel@tonic-gate 	 */
80*7c478bd9Sstevel@tonic-gate 	mintime = INT_MAX;
81*7c478bd9Sstevel@tonic-gate 	(void) sighold(SIGHUP);
82*7c478bd9Sstevel@tonic-gate 	(void) sighold(SIGUSR1);
83*7c478bd9Sstevel@tonic-gate 	(void) sighold(SIGUSR2);
84*7c478bd9Sstevel@tonic-gate 
85*7c478bd9Sstevel@tonic-gate 	iftime += alarmtime;
86*7c478bd9Sstevel@tonic-gate 	if (iftime >= CHECK_INTERVAL) {
87*7c478bd9Sstevel@tonic-gate 		initifs();
88*7c478bd9Sstevel@tonic-gate 		iftime = 0;
89*7c478bd9Sstevel@tonic-gate 	}
90*7c478bd9Sstevel@tonic-gate 	mintime = min(mintime, CHECK_INTERVAL - iftime);
91*7c478bd9Sstevel@tonic-gate 
92*7c478bd9Sstevel@tonic-gate 	mtime += alarmtime;
93*7c478bd9Sstevel@tonic-gate 	if (mtime >= supplyinterval) {
94*7c478bd9Sstevel@tonic-gate 		if (supplier)
95*7c478bd9Sstevel@tonic-gate 			timetomulticast = _B_TRUE;
96*7c478bd9Sstevel@tonic-gate 		mtime = 0;
97*7c478bd9Sstevel@tonic-gate 		supplyinterval = GET_RANDOM(MIN_SUPPLY_TIME, MAX_SUPPLY_TIME);
98*7c478bd9Sstevel@tonic-gate 	}
99*7c478bd9Sstevel@tonic-gate 	mintime = min(mintime, supplyinterval - mtime);
100*7c478bd9Sstevel@tonic-gate 
101*7c478bd9Sstevel@tonic-gate 	for (i = IPV6_ABITS; i >= 0; i--) {
102*7c478bd9Sstevel@tonic-gate 		if (net_hashes[i] == NULL)
103*7c478bd9Sstevel@tonic-gate 			continue;
104*7c478bd9Sstevel@tonic-gate 
105*7c478bd9Sstevel@tonic-gate 		for (rh = net_hashes[i];
106*7c478bd9Sstevel@tonic-gate 		    rh < &net_hashes[i][ROUTEHASHSIZ]; rh++) {
107*7c478bd9Sstevel@tonic-gate 			for (rt = rh->rt_forw; rt != (struct rt_entry *)rh;
108*7c478bd9Sstevel@tonic-gate 			    rt = rt->rt_forw) {
109*7c478bd9Sstevel@tonic-gate 				/*
110*7c478bd9Sstevel@tonic-gate 				 * We don't advance time on a routing entry for
111*7c478bd9Sstevel@tonic-gate 				 * an interface because we catch
112*7c478bd9Sstevel@tonic-gate 				 * interfaces going up and down in initifs.
113*7c478bd9Sstevel@tonic-gate 				 */
114*7c478bd9Sstevel@tonic-gate 				rt->rt_state &= ~RTS_CHANGED;
115*7c478bd9Sstevel@tonic-gate 				if ((rt->rt_state & RTS_INTERFACE) != 0)
116*7c478bd9Sstevel@tonic-gate 					continue;
117*7c478bd9Sstevel@tonic-gate 				rt->rt_timer += alarmtime;
118*7c478bd9Sstevel@tonic-gate 				if (rt->rt_timer >= GARBAGE_TIME) {
119*7c478bd9Sstevel@tonic-gate 					rt = rt->rt_back;
120*7c478bd9Sstevel@tonic-gate 					rtdelete(rt->rt_forw);
121*7c478bd9Sstevel@tonic-gate 					continue;
122*7c478bd9Sstevel@tonic-gate 				}
123*7c478bd9Sstevel@tonic-gate 				if (rt->rt_timer >= EXPIRE_TIME) {
124*7c478bd9Sstevel@tonic-gate 					rtdown(rt);
125*7c478bd9Sstevel@tonic-gate 					mintime = min(mintime,
126*7c478bd9Sstevel@tonic-gate 					    GARBAGE_TIME - rt->rt_timer);
127*7c478bd9Sstevel@tonic-gate 				} else {
128*7c478bd9Sstevel@tonic-gate 					mintime = min(mintime,
129*7c478bd9Sstevel@tonic-gate 					    EXPIRE_TIME - rt->rt_timer);
130*7c478bd9Sstevel@tonic-gate 				}
131*7c478bd9Sstevel@tonic-gate 			}
132*7c478bd9Sstevel@tonic-gate 		}
133*7c478bd9Sstevel@tonic-gate 	}
134*7c478bd9Sstevel@tonic-gate 
135*7c478bd9Sstevel@tonic-gate 	if (timetomulticast) {
136*7c478bd9Sstevel@tonic-gate 		supplyall(&allrouters, 0, (struct interface *)NULL, _B_TRUE);
137*7c478bd9Sstevel@tonic-gate 		(void) gettimeofday(&now, (struct timezone *)NULL);
138*7c478bd9Sstevel@tonic-gate 		lastmcast = now;
139*7c478bd9Sstevel@tonic-gate 		lastfullupdate = now;
140*7c478bd9Sstevel@tonic-gate 		needupdate = _B_FALSE;	/* cancel any pending dynamic update */
141*7c478bd9Sstevel@tonic-gate 		nextmcast.tv_sec = 0;
142*7c478bd9Sstevel@tonic-gate 	}
143*7c478bd9Sstevel@tonic-gate 	(void) sigrelse(SIGUSR2);
144*7c478bd9Sstevel@tonic-gate 	(void) sigrelse(SIGUSR1);
145*7c478bd9Sstevel@tonic-gate 	(void) sigrelse(SIGHUP);
146*7c478bd9Sstevel@tonic-gate 
147*7c478bd9Sstevel@tonic-gate 	/*
148*7c478bd9Sstevel@tonic-gate 	 * "Remember" (via a static) how long until the next timer expires.
149*7c478bd9Sstevel@tonic-gate 	 */
150*7c478bd9Sstevel@tonic-gate 	alarmtime = mintime;
151*7c478bd9Sstevel@tonic-gate 	(void) alarm(alarmtime);
152*7c478bd9Sstevel@tonic-gate }
153*7c478bd9Sstevel@tonic-gate 
154*7c478bd9Sstevel@tonic-gate /*
155*7c478bd9Sstevel@tonic-gate  * On SIGTERM, let everyone know we're going away.
156*7c478bd9Sstevel@tonic-gate  */
157*7c478bd9Sstevel@tonic-gate void
term(void)158*7c478bd9Sstevel@tonic-gate term(void)
159*7c478bd9Sstevel@tonic-gate {
160*7c478bd9Sstevel@tonic-gate 	struct rthash *rh;
161*7c478bd9Sstevel@tonic-gate 	struct rt_entry *rt;
162*7c478bd9Sstevel@tonic-gate 	int i;
163*7c478bd9Sstevel@tonic-gate 
164*7c478bd9Sstevel@tonic-gate 	if (!supplier)
165*7c478bd9Sstevel@tonic-gate 		exit(EXIT_SUCCESS);
166*7c478bd9Sstevel@tonic-gate 	for (i = IPV6_ABITS; i >= 0; i--) {
167*7c478bd9Sstevel@tonic-gate 		if (net_hashes[i] == NULL)
168*7c478bd9Sstevel@tonic-gate 			continue;
169*7c478bd9Sstevel@tonic-gate 
170*7c478bd9Sstevel@tonic-gate 		for (rh = net_hashes[i]; rh < &net_hashes[i][ROUTEHASHSIZ];
171*7c478bd9Sstevel@tonic-gate 		    rh++) {
172*7c478bd9Sstevel@tonic-gate 			for (rt = rh->rt_forw; rt != (struct rt_entry *)rh;
173*7c478bd9Sstevel@tonic-gate 			    rt = rt->rt_forw) {
174*7c478bd9Sstevel@tonic-gate 				rt->rt_metric = HOPCNT_INFINITY;
175*7c478bd9Sstevel@tonic-gate 			}
176*7c478bd9Sstevel@tonic-gate 		}
177*7c478bd9Sstevel@tonic-gate 	}
178*7c478bd9Sstevel@tonic-gate 	supplyall(&allrouters, 0, (struct interface *)NULL, _B_TRUE);
179*7c478bd9Sstevel@tonic-gate 	(void) unlink(PATH_PID);
180*7c478bd9Sstevel@tonic-gate 	exit(EXIT_SUCCESS);
181*7c478bd9Sstevel@tonic-gate }
182