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
rtadvd_timer_init(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
rtadvd_update_timeout_handler(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 *
rtadvd_add_timer(struct rtadvd_timer * (* timeout)(void *),void (* update)(void *,struct timespec *),void * timeodata,void * updatedata)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
rtadvd_remove_timer(struct rtadvd_timer * rat)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 *
rtadvd_check_timer(void)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
rtadvd_set_timer(struct timespec * tm,struct rtadvd_timer * rat)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