db82af41db
Options for DNS Configuration) into rtadvd(8) and rtsold(8). DNS information received by rtsold(8) will go to resolv.conf(5) by resolvconf(8) script. This is based on work by J.R. Oldroyd (kern/156259) but revised extensively[1]. - rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes from interfaces when no "addr" is specified[2]. An entry in rtadvd.conf with "noifprefix" + no "addr" generates an RA message with no prefix information option. - rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an interface is added or removed. - Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191. Reviewed by: bz[1] PR: kern/156259 [1] PR: bin/152458 [2]
206 lines
5.2 KiB
C
206 lines
5.2 KiB
C
/* $FreeBSD$ */
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/* $KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $ */
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/*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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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. Neither the name of the project 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 PROJECT 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 PROJECT 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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#include <sys/time.h>
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#include <sys/queue.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <stdlib.h>
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#include <string.h>
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#include <search.h>
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#include "timer.h"
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#define MILLION 1000000
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struct rtadvd_timer_head_t ra_timer =
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TAILQ_HEAD_INITIALIZER(ra_timer);
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static struct timeval tm_limit = {0x7fffffff, 0x7fffffff};
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static struct timeval tm_max;
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void
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rtadvd_timer_init(void)
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{
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tm_max = tm_limit;
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TAILQ_INIT(&ra_timer);
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}
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struct rtadvd_timer *
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rtadvd_add_timer(struct rtadvd_timer *(*timeout)(void *),
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void (*update)(void *, struct timeval *),
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void *timeodata, void *updatedata)
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{
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struct rtadvd_timer *rat;
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if (timeout == NULL) {
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syslog(LOG_ERR,
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"<%s> timeout function unspecified", __func__);
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exit(1);
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}
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rat = malloc(sizeof(*rat));
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if (rat == NULL) {
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syslog(LOG_ERR,
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"<%s> can't allocate memory", __func__);
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exit(1);
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}
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memset(rat, 0, sizeof(*rat));
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rat->rat_expire = timeout;
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rat->rat_update = update;
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rat->rat_expire_data = timeodata;
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rat->rat_update_data = updatedata;
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rat->rat_tm = tm_max;
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/* link into chain */
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TAILQ_INSERT_TAIL(&ra_timer, rat, rat_next);
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return (rat);
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}
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void
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rtadvd_remove_timer(struct rtadvd_timer *rat)
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{
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if (rat == NULL)
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return;
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TAILQ_REMOVE(&ra_timer, rat, rat_next);
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free(rat);
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}
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void
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rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *rat)
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{
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struct timeval now;
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/* reset the timer */
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gettimeofday(&now, NULL);
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TIMEVAL_ADD(&now, tm, &rat->rat_tm);
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/* update the next expiration time */
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if (TIMEVAL_LT(&rat->rat_tm, &tm_max))
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tm_max = rat->rat_tm;
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return;
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}
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/*
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* Check expiration for each timer. If a timer expires,
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* call the expire function for the timer and update the timer.
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* Return the next interval for select() call.
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*/
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struct timeval *
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rtadvd_check_timer(void)
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{
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static struct timeval returnval;
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struct timeval now;
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struct rtadvd_timer *rat;
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gettimeofday(&now, NULL);
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tm_max = tm_limit;
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TAILQ_FOREACH(rat, &ra_timer, rat_next) {
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if (TIMEVAL_LEQ(&rat->rat_tm, &now)) {
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if (((*rat->rat_expire)(rat->rat_expire_data) == NULL))
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continue; /* the timer was removed */
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if (rat->rat_update)
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(*rat->rat_update)(rat->rat_update_data, &rat->rat_tm);
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TIMEVAL_ADD(&rat->rat_tm, &now, &rat->rat_tm);
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}
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if (TIMEVAL_LT(&rat->rat_tm, &tm_max))
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tm_max = rat->rat_tm;
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}
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if (TIMEVAL_EQUAL(&tm_max, &tm_limit)) {
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/* no need to timeout */
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return (NULL);
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} else if (TIMEVAL_LT(&tm_max, &now)) {
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/* this may occur when the interval is too small */
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returnval.tv_sec = returnval.tv_usec = 0;
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} else
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TIMEVAL_SUB(&tm_max, &now, &returnval);
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return (&returnval);
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}
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struct timeval *
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rtadvd_timer_rest(struct rtadvd_timer *rat)
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{
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static struct timeval returnval, now;
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gettimeofday(&now, NULL);
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if (TIMEVAL_LEQ(&rat->rat_tm, &now)) {
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syslog(LOG_DEBUG,
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"<%s> a timer must be expired, but not yet",
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__func__);
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returnval.tv_sec = returnval.tv_usec = 0;
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}
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else
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TIMEVAL_SUB(&rat->rat_tm, &now, &returnval);
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return (&returnval);
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}
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/* result = a + b */
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void
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TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
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{
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long l;
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if ((l = a->tv_usec + b->tv_usec) < MILLION) {
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result->tv_usec = l;
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result->tv_sec = a->tv_sec + b->tv_sec;
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}
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else {
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result->tv_usec = l - MILLION;
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result->tv_sec = a->tv_sec + b->tv_sec + 1;
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}
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}
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/*
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* result = a - b
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* XXX: this function assumes that a >= b.
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*/
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void
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TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
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{
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long l;
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if ((l = a->tv_usec - b->tv_usec) >= 0) {
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result->tv_usec = l;
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result->tv_sec = a->tv_sec - b->tv_sec;
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}
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else {
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result->tv_usec = MILLION + l;
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result->tv_sec = a->tv_sec - b->tv_sec - 1;
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}
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}
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