1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) 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.
*
* c) Neither the name of Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#if defined(__Userspace__)
#include <sys/types.h>
#if !defined (__Userspace_os_Windows)
#include <sys/wait.h>
#include <unistd.h>
#include <pthread.h>
#endif
#if defined(__Userspace_os_NaCl)
#include <sys/select.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <user_atomic.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_pcb.h>
#else
#include <netinet/sctp_os.h>
#include <netinet/sctp_callout.h>
#include <netinet/sctp_pcb.h>
#endif
/*
* Callout/Timer routines for OS that doesn't have them
*/
#if defined(__APPLE__) || defined(__Userspace__)
static int ticks = 0;
#else
extern int ticks;
#endif
int sctp_get_tick_count(void) {
int ret;
SCTP_TIMERQ_LOCK();
ret = ticks;
SCTP_TIMERQ_UNLOCK();
return ret;
}
/*
* SCTP_TIMERQ_LOCK protects:
* - SCTP_BASE_INFO(callqueue)
* - sctp_os_timer_next: next timer to check
*/
static sctp_os_timer_t *sctp_os_timer_next = NULL;
void
sctp_os_timer_init(sctp_os_timer_t *c)
{
memset(c, 0, sizeof(*c));
}
void
sctp_os_timer_start(sctp_os_timer_t *c, int to_ticks, void (*ftn) (void *),
void *arg)
{
/* paranoia */
if ((c == NULL) || (ftn == NULL))
return;
SCTP_TIMERQ_LOCK();
/* check to see if we're rescheduling a timer */
if (c->c_flags & SCTP_CALLOUT_PENDING) {
if (c == sctp_os_timer_next) {
sctp_os_timer_next = TAILQ_NEXT(c, tqe);
}
TAILQ_REMOVE(&SCTP_BASE_INFO(callqueue), c, tqe);
/*
* part of the normal "stop a pending callout" process
* is to clear the CALLOUT_ACTIVE and CALLOUT_PENDING
* flags. We don't bother since we are setting these
* below and we still hold the lock.
*/
}
/*
* We could unlock/splx here and lock/spl at the TAILQ_INSERT_TAIL,
* but there's no point since doing this setup doesn't take much time.
*/
if (to_ticks <= 0)
to_ticks = 1;
c->c_arg = arg;
c->c_flags = (SCTP_CALLOUT_ACTIVE | SCTP_CALLOUT_PENDING);
c->c_func = ftn;
c->c_time = ticks + to_ticks;
TAILQ_INSERT_TAIL(&SCTP_BASE_INFO(callqueue), c, tqe);
SCTP_TIMERQ_UNLOCK();
}
int
sctp_os_timer_stop(sctp_os_timer_t *c)
{
SCTP_TIMERQ_LOCK();
/*
* Don't attempt to delete a callout that's not on the queue.
*/
if (!(c->c_flags & SCTP_CALLOUT_PENDING)) {
c->c_flags &= ~SCTP_CALLOUT_ACTIVE;
SCTP_TIMERQ_UNLOCK();
return (0);
}
c->c_flags &= ~(SCTP_CALLOUT_ACTIVE | SCTP_CALLOUT_PENDING);
if (c == sctp_os_timer_next) {
sctp_os_timer_next = TAILQ_NEXT(c, tqe);
}
TAILQ_REMOVE(&SCTP_BASE_INFO(callqueue), c, tqe);
SCTP_TIMERQ_UNLOCK();
return (1);
}
static void
sctp_handle_tick(int delta)
{
sctp_os_timer_t *c;
void (*c_func)(void *);
void *c_arg;
SCTP_TIMERQ_LOCK();
/* update our tick count */
ticks += delta;
c = TAILQ_FIRST(&SCTP_BASE_INFO(callqueue));
while (c) {
if (c->c_time <= ticks) {
sctp_os_timer_next = TAILQ_NEXT(c, tqe);
TAILQ_REMOVE(&SCTP_BASE_INFO(callqueue), c, tqe);
c_func = c->c_func;
c_arg = c->c_arg;
c->c_flags &= ~SCTP_CALLOUT_PENDING;
SCTP_TIMERQ_UNLOCK();
c_func(c_arg);
SCTP_TIMERQ_LOCK();
c = sctp_os_timer_next;
} else {
c = TAILQ_NEXT(c, tqe);
}
}
sctp_os_timer_next = NULL;
SCTP_TIMERQ_UNLOCK();
}
#if defined(__APPLE__)
void
sctp_timeout(void *arg SCTP_UNUSED)
{
sctp_handle_tick(SCTP_BASE_VAR(sctp_main_timer_ticks));
sctp_start_main_timer();
}
#endif
#if defined(__Userspace__)
#define TIMEOUT_INTERVAL 10
void *
user_sctp_timer_iterate(void *arg)
{
sctp_userspace_set_threadname("SCTP timer");
for (;;) {
#if defined (__Userspace_os_Windows)
Sleep(TIMEOUT_INTERVAL);
#else
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 1000 * TIMEOUT_INTERVAL;
select(0, NULL, NULL, NULL, &timeout);
#endif
if (atomic_cmpset_int(&SCTP_BASE_VAR(timer_thread_should_exit), 1, 1)) {
break;
}
sctp_handle_tick(MSEC_TO_TICKS(TIMEOUT_INTERVAL));
}
return (NULL);
}
void
sctp_start_timer(void)
{
/*
* No need to do SCTP_TIMERQ_LOCK_INIT();
* here, it is being done in sctp_pcb_init()
*/
int rc;
rc = sctp_userspace_thread_create(&SCTP_BASE_VAR(timer_thread), user_sctp_timer_iterate);
if (rc) {
SCTP_PRINTF("ERROR; return code from sctp_thread_create() is %d\n", rc);
}
}
#endif
|
