1 /* $FreeBSD$ */ 2 /* $KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (C) 1998 WIDE Project. 8 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the project nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/queue.h> 37 #include <sys/socket.h> 38 39 #include <net/if.h> 40 #include <net/if_dl.h> 41 #include <netinet/in.h> 42 43 #include <unistd.h> 44 #include <syslog.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <search.h> 48 #include <time.h> 49 #include <netdb.h> 50 51 #include "rtadvd.h" 52 #include "timer_subr.h" 53 #include "timer.h" 54 55 struct rtadvd_timer_head_t ra_timer = 56 TAILQ_HEAD_INITIALIZER(ra_timer); 57 static struct timespec tm_limit; 58 static struct timespec tm_max; 59 60 void 61 rtadvd_timer_init(void) 62 { 63 /* Generate maximum time in timespec. */ 64 tm_limit.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1)); 65 tm_limit.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1)); 66 tm_max = tm_limit; 67 TAILQ_INIT(&ra_timer); 68 } 69 70 void 71 rtadvd_update_timeout_handler(void) 72 { 73 struct ifinfo *ifi; 74 75 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 76 switch (ifi->ifi_state) { 77 case IFI_STATE_CONFIGURED: 78 case IFI_STATE_TRANSITIVE: 79 if (ifi->ifi_ra_timer != NULL) 80 continue; 81 82 syslog(LOG_DEBUG, "<%s> add timer for %s (idx=%d)", 83 __func__, ifi->ifi_ifname, ifi->ifi_ifindex); 84 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 85 ra_timer_update, ifi, ifi); 86 ra_timer_update((void *)ifi, 87 &ifi->ifi_ra_timer->rat_tm); 88 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 89 ifi->ifi_ra_timer); 90 break; 91 case IFI_STATE_UNCONFIGURED: 92 if (ifi->ifi_ra_timer == NULL) 93 continue; 94 95 syslog(LOG_DEBUG, 96 "<%s> remove timer for %s (idx=%d)", __func__, 97 ifi->ifi_ifname, ifi->ifi_ifindex); 98 rtadvd_remove_timer(ifi->ifi_ra_timer); 99 ifi->ifi_ra_timer = NULL; 100 break; 101 } 102 } 103 104 return; 105 } 106 107 struct rtadvd_timer * 108 rtadvd_add_timer(struct rtadvd_timer *(*timeout)(void *), 109 void (*update)(void *, struct timespec *), 110 void *timeodata, void *updatedata) 111 { 112 struct rtadvd_timer *rat; 113 114 if (timeout == NULL) { 115 syslog(LOG_ERR, 116 "<%s> timeout function unspecified", __func__); 117 exit(1); 118 } 119 120 rat = malloc(sizeof(*rat)); 121 if (rat == NULL) { 122 syslog(LOG_ERR, 123 "<%s> can't allocate memory", __func__); 124 exit(1); 125 } 126 memset(rat, 0, sizeof(*rat)); 127 128 rat->rat_expire = timeout; 129 rat->rat_update = update; 130 rat->rat_expire_data = timeodata; 131 rat->rat_update_data = updatedata; 132 rat->rat_tm = tm_max; 133 134 /* link into chain */ 135 TAILQ_INSERT_TAIL(&ra_timer, rat, rat_next); 136 137 return (rat); 138 } 139 140 void 141 rtadvd_remove_timer(struct rtadvd_timer *rat) 142 { 143 144 if (rat == NULL) 145 return; 146 147 TAILQ_REMOVE(&ra_timer, rat, rat_next); 148 free(rat); 149 } 150 151 /* 152 * Check expiration for each timer. If a timer expires, 153 * call the expire function for the timer and update the timer. 154 * Return the next interval for select() call. 155 */ 156 struct timespec * 157 rtadvd_check_timer(void) 158 { 159 static struct timespec returnval; 160 struct timespec now; 161 struct rtadvd_timer *rat; 162 163 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 164 tm_max = tm_limit; 165 TAILQ_FOREACH(rat, &ra_timer, rat_next) { 166 if (TS_CMP(&rat->rat_tm, &now, <=)) { 167 if (((*rat->rat_expire)(rat->rat_expire_data) == NULL)) 168 continue; /* the timer was removed */ 169 if (rat->rat_update) 170 (*rat->rat_update)(rat->rat_update_data, &rat->rat_tm); 171 TS_ADD(&rat->rat_tm, &now, &rat->rat_tm); 172 } 173 if (TS_CMP(&rat->rat_tm, &tm_max, <)) 174 tm_max = rat->rat_tm; 175 } 176 if (TS_CMP(&tm_max, &tm_limit, ==)) { 177 /* no need to timeout */ 178 return (NULL); 179 } else if (TS_CMP(&tm_max, &now, <)) { 180 /* this may occur when the interval is too small */ 181 returnval.tv_sec = returnval.tv_nsec = 0; 182 } else 183 TS_SUB(&tm_max, &now, &returnval); 184 return (&returnval); 185 } 186 187 void 188 rtadvd_set_timer(struct timespec *tm, struct rtadvd_timer *rat) 189 { 190 struct timespec now; 191 192 /* reset the timer */ 193 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 194 TS_ADD(&now, tm, &rat->rat_tm); 195 196 /* update the next expiration time */ 197 if (TS_CMP(&rat->rat_tm, &tm_max, <)) 198 tm_max = rat->rat_tm; 199 200 return; 201 } 202