1 /* $FreeBSD: stable/10/usr.sbin/rtadvd/timer.c 253995 2013-08-06 15:49:18Z hrs $ */ 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/queue.h> 35 #include <sys/socket.h> 36 37 #include <net/if.h> 38 #include <net/if_dl.h> 39 #include <netinet/in.h> 40 41 #include <unistd.h> 42 #include <syslog.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <search.h> 46 #include <time.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 timespec tm_limit; 56 static struct timespec tm_max; 57 58 void 59 rtadvd_timer_init(void) 60 { 61 /* Generate maximum time in timespec. */ 62 tm_limit.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1)); 63 tm_limit.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1)); 64 tm_max = tm_limit; 65 TAILQ_INIT(&ra_timer); 66 } 67 68 void 69 rtadvd_update_timeout_handler(void) 70 { 71 struct ifinfo *ifi; 72 73 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 74 switch (ifi->ifi_state) { 75 case IFI_STATE_CONFIGURED: 76 case IFI_STATE_TRANSITIVE: 77 if (ifi->ifi_ra_timer != NULL) 78 continue; 79 80 syslog(LOG_DEBUG, "<%s> add timer for %s (idx=%d)", 81 __func__, ifi->ifi_ifname, ifi->ifi_ifindex); 82 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 83 ra_timer_update, ifi, ifi); 84 ra_timer_update((void *)ifi, 85 &ifi->ifi_ra_timer->rat_tm); 86 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 87 ifi->ifi_ra_timer); 88 break; 89 case IFI_STATE_UNCONFIGURED: 90 if (ifi->ifi_ra_timer == NULL) 91 continue; 92 93 syslog(LOG_DEBUG, 94 "<%s> remove timer for %s (idx=%d)", __func__, 95 ifi->ifi_ifname, ifi->ifi_ifindex); 96 rtadvd_remove_timer(ifi->ifi_ra_timer); 97 ifi->ifi_ra_timer = NULL; 98 break; 99 } 100 } 101 102 return; 103 } 104 105 struct rtadvd_timer * 106 rtadvd_add_timer(struct rtadvd_timer *(*timeout)(void *), 107 void (*update)(void *, struct timespec *), 108 void *timeodata, void *updatedata) 109 { 110 struct rtadvd_timer *rat; 111 112 if (timeout == NULL) { 113 syslog(LOG_ERR, 114 "<%s> timeout function unspecified", __func__); 115 exit(1); 116 } 117 118 rat = malloc(sizeof(*rat)); 119 if (rat == NULL) { 120 syslog(LOG_ERR, 121 "<%s> can't allocate memory", __func__); 122 exit(1); 123 } 124 memset(rat, 0, sizeof(*rat)); 125 126 rat->rat_expire = timeout; 127 rat->rat_update = update; 128 rat->rat_expire_data = timeodata; 129 rat->rat_update_data = updatedata; 130 rat->rat_tm = tm_max; 131 132 /* link into chain */ 133 TAILQ_INSERT_TAIL(&ra_timer, rat, rat_next); 134 135 return (rat); 136 } 137 138 void 139 rtadvd_remove_timer(struct rtadvd_timer *rat) 140 { 141 142 if (rat == NULL) 143 return; 144 145 TAILQ_REMOVE(&ra_timer, rat, rat_next); 146 free(rat); 147 } 148 149 /* 150 * Check expiration for each timer. If a timer expires, 151 * call the expire function for the timer and update the timer. 152 * Return the next interval for select() call. 153 */ 154 struct timespec * 155 rtadvd_check_timer(void) 156 { 157 static struct timespec returnval; 158 struct timespec now; 159 struct rtadvd_timer *rat; 160 161 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 162 tm_max = tm_limit; 163 TAILQ_FOREACH(rat, &ra_timer, rat_next) { 164 if (TS_CMP(&rat->rat_tm, &now, <=)) { 165 if (((*rat->rat_expire)(rat->rat_expire_data) == NULL)) 166 continue; /* the timer was removed */ 167 if (rat->rat_update) 168 (*rat->rat_update)(rat->rat_update_data, &rat->rat_tm); 169 TS_ADD(&rat->rat_tm, &now, &rat->rat_tm); 170 } 171 if (TS_CMP(&rat->rat_tm, &tm_max, <)) 172 tm_max = rat->rat_tm; 173 } 174 if (TS_CMP(&tm_max, &tm_limit, ==)) { 175 /* no need to timeout */ 176 return (NULL); 177 } else if (TS_CMP(&tm_max, &now, <)) { 178 /* this may occur when the interval is too small */ 179 returnval.tv_sec = returnval.tv_nsec = 0; 180 } else 181 TS_SUB(&tm_max, &now, &returnval); 182 return (&returnval); 183 } 184 185 void 186 rtadvd_set_timer(struct timespec *tm, struct rtadvd_timer *rat) 187 { 188 struct timespec now; 189 190 /* reset the timer */ 191 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 192 TS_ADD(&now, tm, &rat->rat_tm); 193 194 /* update the next expiration time */ 195 if (TS_CMP(&rat->rat_tm, &tm_max, <)) 196 tm_max = rat->rat_tm; 197 198 return; 199 } 200