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freebsd/usr.sbin/rtadvd/timer.c
2013-08-06 15:49:18 +00:00

200 lines
5.4 KiB
C

/* $FreeBSD$ */
/* $KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $ */
/*
* Copyright (C) 1998 WIDE Project.
* Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
* All rights reserved.
*
* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <unistd.h>
#include <syslog.h>
#include <stdlib.h>
#include <string.h>
#include <search.h>
#include <time.h>
#include <netdb.h>
#include "rtadvd.h"
#include "timer_subr.h"
#include "timer.h"
struct rtadvd_timer_head_t ra_timer =
TAILQ_HEAD_INITIALIZER(ra_timer);
static struct timespec tm_limit;
static struct timespec tm_max;
void
rtadvd_timer_init(void)
{
/* Generate maximum time in timespec. */
tm_limit.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
tm_limit.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
tm_max = tm_limit;
TAILQ_INIT(&ra_timer);
}
void
rtadvd_update_timeout_handler(void)
{
struct ifinfo *ifi;
TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
switch (ifi->ifi_state) {
case IFI_STATE_CONFIGURED:
case IFI_STATE_TRANSITIVE:
if (ifi->ifi_ra_timer != NULL)
continue;
syslog(LOG_DEBUG, "<%s> add timer for %s (idx=%d)",
__func__, ifi->ifi_ifname, ifi->ifi_ifindex);
ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
ra_timer_update, ifi, ifi);
ra_timer_update((void *)ifi,
&ifi->ifi_ra_timer->rat_tm);
rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
ifi->ifi_ra_timer);
break;
case IFI_STATE_UNCONFIGURED:
if (ifi->ifi_ra_timer == NULL)
continue;
syslog(LOG_DEBUG,
"<%s> remove timer for %s (idx=%d)", __func__,
ifi->ifi_ifname, ifi->ifi_ifindex);
rtadvd_remove_timer(ifi->ifi_ra_timer);
ifi->ifi_ra_timer = NULL;
break;
}
}
return;
}
struct rtadvd_timer *
rtadvd_add_timer(struct rtadvd_timer *(*timeout)(void *),
void (*update)(void *, struct timespec *),
void *timeodata, void *updatedata)
{
struct rtadvd_timer *rat;
if (timeout == NULL) {
syslog(LOG_ERR,
"<%s> timeout function unspecified", __func__);
exit(1);
}
rat = malloc(sizeof(*rat));
if (rat == NULL) {
syslog(LOG_ERR,
"<%s> can't allocate memory", __func__);
exit(1);
}
memset(rat, 0, sizeof(*rat));
rat->rat_expire = timeout;
rat->rat_update = update;
rat->rat_expire_data = timeodata;
rat->rat_update_data = updatedata;
rat->rat_tm = tm_max;
/* link into chain */
TAILQ_INSERT_TAIL(&ra_timer, rat, rat_next);
return (rat);
}
void
rtadvd_remove_timer(struct rtadvd_timer *rat)
{
if (rat == NULL)
return;
TAILQ_REMOVE(&ra_timer, rat, rat_next);
free(rat);
}
/*
* Check expiration for each timer. If a timer expires,
* call the expire function for the timer and update the timer.
* Return the next interval for select() call.
*/
struct timespec *
rtadvd_check_timer(void)
{
static struct timespec returnval;
struct timespec now;
struct rtadvd_timer *rat;
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
tm_max = tm_limit;
TAILQ_FOREACH(rat, &ra_timer, rat_next) {
if (TS_CMP(&rat->rat_tm, &now, <=)) {
if (((*rat->rat_expire)(rat->rat_expire_data) == NULL))
continue; /* the timer was removed */
if (rat->rat_update)
(*rat->rat_update)(rat->rat_update_data, &rat->rat_tm);
TS_ADD(&rat->rat_tm, &now, &rat->rat_tm);
}
if (TS_CMP(&rat->rat_tm, &tm_max, <))
tm_max = rat->rat_tm;
}
if (TS_CMP(&tm_max, &tm_limit, ==)) {
/* no need to timeout */
return (NULL);
} else if (TS_CMP(&tm_max, &now, <)) {
/* this may occur when the interval is too small */
returnval.tv_sec = returnval.tv_nsec = 0;
} else
TS_SUB(&tm_max, &now, &returnval);
return (&returnval);
}
void
rtadvd_set_timer(struct timespec *tm, struct rtadvd_timer *rat)
{
struct timespec now;
/* reset the timer */
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
TS_ADD(&now, tm, &rat->rat_tm);
/* update the next expiration time */
if (TS_CMP(&rat->rat_tm, &tm_max, <))
tm_max = rat->rat_tm;
return;
}