253 lines
7.5 KiB
C
253 lines
7.5 KiB
C
/****************************************************************************
|
|
* net/arp/arp_notify.c
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. Neither the name NuttX 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <time.h>
|
|
#include <semaphore.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/irq.h>
|
|
|
|
#include "arp/arp.h"
|
|
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* List of tasks waiting for ARP events */
|
|
|
|
static FAR struct arp_notify_s *g_arp_waiters;
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: arp_wait_setup
|
|
*
|
|
* Description:
|
|
* Called BEFORE an ARP request is sent. This function sets up the ARP
|
|
* response timeout before the the ARP request is sent so that there is
|
|
* no race condition when arp_wait() is called.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from ARP send and executes in the normal
|
|
* tasking environment.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void arp_wait_setup(in_addr_t ipaddr, FAR struct arp_notify_s *notify)
|
|
{
|
|
irqstate_t flags;
|
|
|
|
/* Initialize the wait structure */
|
|
|
|
notify->nt_ipaddr = ipaddr;
|
|
notify->nt_result = -ETIMEDOUT;
|
|
(void)sem_init(¬ify->nt_sem, 0, 0);
|
|
|
|
/* Add the wait structure to the list with interrupts disabled */
|
|
|
|
flags = enter_critical_section();
|
|
notify->nt_flink = g_arp_waiters;
|
|
g_arp_waiters = notify;
|
|
leave_critical_section(flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: arp_wait_cancel
|
|
*
|
|
* Description:
|
|
* Cancel any wait set after arp_wait_setup is called but before arp_wait()
|
|
* is called (arp_wait() will automatically cancel the wait).
|
|
*
|
|
* Assumptions:
|
|
* This function may execute in the interrupt context when called from
|
|
* arp_wait().
|
|
*
|
|
****************************************************************************/
|
|
|
|
int arp_wait_cancel(FAR struct arp_notify_s *notify)
|
|
{
|
|
FAR struct arp_notify_s *curr;
|
|
FAR struct arp_notify_s *prev;
|
|
irqstate_t flags;
|
|
int ret = -ENOENT;
|
|
|
|
/* Remove our wait structure from the list (we may no longer be at the
|
|
* head of the list).
|
|
*/
|
|
|
|
flags = enter_critical_section();
|
|
for (prev = NULL, curr = g_arp_waiters;
|
|
curr && curr != notify;
|
|
prev = curr, curr = curr->nt_flink);
|
|
|
|
DEBUGASSERT(curr && curr == notify);
|
|
if (curr)
|
|
{
|
|
if (prev)
|
|
{
|
|
prev->nt_flink = notify->nt_flink;
|
|
}
|
|
else
|
|
{
|
|
g_arp_waiters = notify->nt_flink;
|
|
}
|
|
|
|
ret = OK;
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
(void)sem_destroy(¬ify->nt_sem);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: arp_wait
|
|
*
|
|
* Description:
|
|
* Called each time that a ARP request is sent. This function will sleep
|
|
* until either: (1) the matching ARP response is received, or (2) a
|
|
* timeout occurs.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from ARP send must execute with the network
|
|
* locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int arp_wait(FAR struct arp_notify_s *notify, FAR struct timespec *timeout)
|
|
{
|
|
struct timespec abstime;
|
|
irqstate_t flags;
|
|
int errcode;
|
|
int ret;
|
|
|
|
/* And wait for the ARP response (or a timeout). Interrupts will be re-
|
|
* enabled while we wait.
|
|
*/
|
|
|
|
flags = enter_critical_section();
|
|
DEBUGVERIFY(clock_gettime(CLOCK_REALTIME, &abstime));
|
|
|
|
abstime.tv_sec += timeout->tv_sec;
|
|
abstime.tv_nsec += timeout->tv_nsec;
|
|
if (abstime.tv_nsec >= 1000000000)
|
|
{
|
|
abstime.tv_sec++;
|
|
abstime.tv_nsec -= 1000000000;
|
|
}
|
|
|
|
/* Wait to get either the correct response or a timeout. */
|
|
|
|
do
|
|
{
|
|
/* The only errors that we expect would be if the abstime timeout
|
|
* expires or if the wait were interrupted by a signal.
|
|
*/
|
|
|
|
ret = net_timedwait(¬ify->nt_sem, &abstime);
|
|
errcode = ((ret < 0) ? get_errno() : 0);
|
|
}
|
|
while (ret < 0 && errcode == EINTR);
|
|
|
|
/* Then get the real result of the transfer */
|
|
|
|
ret = notify->nt_result;
|
|
|
|
/* Remove our wait structure from the list (we may no longer be at the
|
|
* head of the list).
|
|
*/
|
|
|
|
(void)arp_wait_cancel(notify);
|
|
|
|
/* Re-enable interrupts and return the result of the wait */
|
|
|
|
leave_critical_section(flags);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: arp_notify
|
|
*
|
|
* Description:
|
|
* Called each time that a ARP response is received in order to wake-up
|
|
* any threads that may be waiting for this particular ARP response.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver indirectly through
|
|
* arp_arpin() will execute with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void arp_notify(in_addr_t ipaddr)
|
|
{
|
|
FAR struct arp_notify_s *curr;
|
|
|
|
/* Find an entry with the matching IP address in the list of waiters */
|
|
|
|
for (curr = g_arp_waiters; curr; curr = curr->nt_flink)
|
|
{
|
|
/* Does this entry match? If the result is okay, then we have
|
|
* already notified this waiter and it has not yet taken the
|
|
* entry from the list.
|
|
*/
|
|
|
|
if (curr->nt_result != OK && curr->nt_ipaddr == ipaddr)
|
|
{
|
|
/* Yes.. Signal the waiting, returning success */
|
|
|
|
curr->nt_result = OK;
|
|
sem_post(&curr->nt_sem);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_NET_ARP_SEND */
|