1 /* $FreeBSD$ */ 2 /* $KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/time.h> 35 #include <sys/queue.h> 36 #include <sys/socket.h> 37 38 #include <net/if.h> 39 #include <net/if_dl.h> 40 #include <netinet/in.h> 41 42 #include <unistd.h> 43 #include <syslog.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <search.h> 47 #include <netdb.h> 48 49 #include "rtadvd.h" 50 #include "timer_subr.h" 51 #include "timer.h" 52 53 struct rtadvd_timer_head_t ra_timer = 54 TAILQ_HEAD_INITIALIZER(ra_timer); 55 static struct timeval tm_limit = {0x7fffffff, 0x7fffffff}; 56 static struct timeval tm_max; 57 58 void 59 rtadvd_timer_init(void) 60 { 61 62 tm_max = tm_limit; 63 TAILQ_INIT(&ra_timer); 64 } 65 66 void 67 rtadvd_update_timeout_handler(void) 68 { 69 struct ifinfo *ifi; 70 71 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 72 switch (ifi->ifi_state) { 73 case IFI_STATE_CONFIGURED: 74 case IFI_STATE_TRANSITIVE: 75 if (ifi->ifi_ra_timer != NULL) 76 continue; 77 78 syslog(LOG_DEBUG, "<%s> add timer for %s (idx=%d)", 79 __func__, ifi->ifi_ifname, ifi->ifi_ifindex); 80 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 81 ra_timer_update, ifi, ifi); 82 ra_timer_update((void *)ifi, 83 &ifi->ifi_ra_timer->rat_tm); 84 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 85 ifi->ifi_ra_timer); 86 break; 87 case IFI_STATE_UNCONFIGURED: 88 if (ifi->ifi_ra_timer == NULL) 89 continue; 90 91 syslog(LOG_DEBUG, 92 "<%s> remove timer for %s (idx=%d)", __func__, 93 ifi->ifi_ifname, ifi->ifi_ifindex); 94 rtadvd_remove_timer(ifi->ifi_ra_timer); 95 ifi->ifi_ra_timer = NULL; 96 break; 97 } 98 } 99 100 return; 101 } 102 103 struct rtadvd_timer * 104 rtadvd_add_timer(struct rtadvd_timer *(*timeout)(void *), 105 void (*update)(void *, struct timeval *), 106 void *timeodata, void *updatedata) 107 { 108 struct rtadvd_timer *rat; 109 110 if (timeout == NULL) { 111 syslog(LOG_ERR, 112 "<%s> timeout function unspecified", __func__); 113 exit(1); 114 } 115 116 rat = malloc(sizeof(*rat)); 117 if (rat == NULL) { 118 syslog(LOG_ERR, 119 "<%s> can't allocate memory", __func__); 120 exit(1); 121 } 122 memset(rat, 0, sizeof(*rat)); 123 124 rat->rat_expire = timeout; 125 rat->rat_update = update; 126 rat->rat_expire_data = timeodata; 127 rat->rat_update_data = updatedata; 128 rat->rat_tm = tm_max; 129 130 /* link into chain */ 131 TAILQ_INSERT_TAIL(&ra_timer, rat, rat_next); 132 133 return (rat); 134 } 135 136 void 137 rtadvd_remove_timer(struct rtadvd_timer *rat) 138 { 139 140 if (rat == NULL) 141 return; 142 143 TAILQ_REMOVE(&ra_timer, rat, rat_next); 144 free(rat); 145 } 146 147 /* 148 * Check expiration for each timer. If a timer expires, 149 * call the expire function for the timer and update the timer. 150 * Return the next interval for select() call. 151 */ 152 struct timeval * 153 rtadvd_check_timer(void) 154 { 155 static struct timeval returnval; 156 struct timeval now; 157 struct rtadvd_timer *rat; 158 159 gettimeofday(&now, NULL); 160 tm_max = tm_limit; 161 TAILQ_FOREACH(rat, &ra_timer, rat_next) { 162 if (TIMEVAL_LEQ(&rat->rat_tm, &now)) { 163 if (((*rat->rat_expire)(rat->rat_expire_data) == NULL)) 164 continue; /* the timer was removed */ 165 if (rat->rat_update) 166 (*rat->rat_update)(rat->rat_update_data, &rat->rat_tm); 167 TIMEVAL_ADD(&rat->rat_tm, &now, &rat->rat_tm); 168 } 169 if (TIMEVAL_LT(&rat->rat_tm, &tm_max)) 170 tm_max = rat->rat_tm; 171 } 172 if (TIMEVAL_EQUAL(&tm_max, &tm_limit)) { 173 /* no need to timeout */ 174 return (NULL); 175 } else if (TIMEVAL_LT(&tm_max, &now)) { 176 /* this may occur when the interval is too small */ 177 returnval.tv_sec = returnval.tv_usec = 0; 178 } else 179 TIMEVAL_SUB(&tm_max, &now, &returnval); 180 return (&returnval); 181 } 182 183 void 184 rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *rat) 185 { 186 struct timeval now; 187 188 /* reset the timer */ 189 gettimeofday(&now, NULL); 190 TIMEVAL_ADD(&now, tm, &rat->rat_tm); 191 192 /* update the next expiration time */ 193 if (TIMEVAL_LT(&rat->rat_tm, &tm_max)) 194 tm_max = rat->rat_tm; 195 196 return; 197 } 198