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/*-
* 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(_WIN32)
#include <sys/wait.h>
#include <unistd.h>
#include <pthread.h>
#endif
#if defined(__native_client__)
#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
#include <netinet/sctputil.h>
/*
* Callout/Timer routines for OS that doesn't have them
*/
#if defined(__APPLE__) || defined(__Userspace__)
static uint32_t ticks = 0;
#else
extern int ticks;
#endif
uint32_t sctp_get_tick_count(void) {
uint32_t 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));
}
int
sctp_os_timer_start(sctp_os_timer_t *c, uint32_t to_ticks, void (*ftn) (void *),
void *arg)
{
int ret = 0;
/* paranoia */
if ((c == NULL) || (ftn == NULL))
return (ret);
SCTP_TIMERQ_LOCK();
/* check to see if we're rescheduling a timer */
if (c->c_flags & SCTP_CALLOUT_PENDING) {
ret = 1;
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();
return (ret);
}
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);
}
void
sctp_handle_tick(uint32_t elapsed_ticks)
{
sctp_os_timer_t *c;
void (*c_func)(void *);
void *c_arg;
SCTP_TIMERQ_LOCK();
/* update our tick count */
ticks += elapsed_ticks;
c = TAILQ_FIRST(&SCTP_BASE_INFO(callqueue));
while (c) {
if (SCTP_UINT32_GE(ticks, c->c_time)) {
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__) && !defined(__Userspace__)
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(_WIN32)
Sleep(TIMEOUT_INTERVAL);
#else
struct timespec amount, remaining;
remaining.tv_sec = 0;
remaining.tv_nsec = TIMEOUT_INTERVAL * 1000 * 1000;
do {
amount = remaining;
} while (nanosleep(&amount, &remaining) == -1);
#endif
if (atomic_cmpset_int(&SCTP_BASE_VAR(timer_thread_should_exit), 1, 1)) {
break;
}
sctp_handle_tick(sctp_msecs_to_ticks(TIMEOUT_INTERVAL));
}
return (NULL);
}
void
sctp_start_timer_thread(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);
} else {
SCTP_BASE_VAR(timer_thread_started) = 1;
}
}
void
sctp_stop_timer_thread(void)
{
atomic_cmpset_int(&SCTP_BASE_VAR(timer_thread_should_exit), 0, 1);
if (SCTP_BASE_VAR(timer_thread_started)) {
#if defined(_WIN32)
WaitForSingleObject(SCTP_BASE_VAR(timer_thread), INFINITE);
CloseHandle(SCTP_BASE_VAR(timer_thread));
#else
pthread_join(SCTP_BASE_VAR(timer_thread), NULL);
#endif
}
}
#endif
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