258 lines
8.1 KiB
C
258 lines
8.1 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_notify.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <time.h>
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#include <semaphore.h>
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#include <errno.h>
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#include <debug.h>
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#include <netinet/in.h>
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#include <arch/irq.h>
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* List of tasks waiting for Neighbor Discover events */
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static struct icmpv6_notify_s *g_icmpv6_waiters;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: icmpv6_wait_setup
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*
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* Description:
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* Called BEFORE an Neighbor Solicitation is sent. This function sets up
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* the Neighbor Advertisement timeout before the the Neighbor Solicitation
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* is sent so that there is no race condition when icmpv6_wait() is called.
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*
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* Assumptions:
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* This function is called from icmpv6_neighbor() and executes in the normal
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* tasking environment.
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*
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****************************************************************************/
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void icmpv6_wait_setup(const net_ipv6addr_t ipaddr,
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FAR struct icmpv6_notify_s *notify)
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{
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irqstate_t flags;
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/* Initialize the wait structure */
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net_ipv6addr_copy(notify->nt_ipaddr, ipaddr);
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notify->nt_result = -ETIMEDOUT;
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(void)sem_init(¬ify->nt_sem, 0, 0);
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/* Add the wait structure to the list with interrupts disabled */
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flags = irqsave();
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notify->nt_flink = g_icmpv6_waiters;
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g_icmpv6_waiters = notify;
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irqrestore(flags);
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}
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/****************************************************************************
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* Function: icmpv6_wait_cancel
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*
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* Description:
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* Cancel any wait set after icmpv6_wait_setup is called but before
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* icmpv6_wait()is called (icmpv6_wait() will automatically cancel the
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* wait).
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*
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* Assumptions:
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* This function may execute in the interrupt context when called from
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* icmpv6_wait().
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*
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****************************************************************************/
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int icmpv6_wait_cancel(FAR struct icmpv6_notify_s *notify)
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{
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FAR struct icmpv6_notify_s *curr;
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FAR struct icmpv6_notify_s *prev;
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irqstate_t flags;
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int ret = -ENOENT;
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/* Remove our wait structure from the list (we may no longer be at the
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* head of the list).
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*/
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flags = irqsave();
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for (prev = NULL, curr = g_icmpv6_waiters;
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curr && curr != notify;
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prev = curr, curr = curr->nt_flink);
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DEBUGASSERT(curr && curr == notify);
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if (curr)
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{
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if (prev)
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{
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prev->nt_flink = notify->nt_flink;
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}
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else
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{
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g_icmpv6_waiters = notify->nt_flink;
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}
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ret = OK;
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}
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irqrestore(flags);
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(void)sem_destroy(¬ify->nt_sem);
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return ret;
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}
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/****************************************************************************
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* Function: icmpv6_wait
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*
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* Description:
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* Called each time that a Neighbor Solicitation is sent. This function
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* will sleep until either: (1) the matching Neighbor Advertisement is
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* received, or (2) a timeout occurs.
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*
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* Assumptions:
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* This function is called from icmpv6_neighbor() and must execute with
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* the network un-locked (interrupts may be disabled to keep the things
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* stable).
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*
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****************************************************************************/
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int icmpv6_wait(FAR struct icmpv6_notify_s *notify,
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FAR struct timespec *timeout)
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{
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struct timespec abstime;
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irqstate_t flags;
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int ret;
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/* And wait for the Neighbor Advertisement (or a timeout). Interrupts will
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* be re-enabled while we wait.
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*/
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flags = irqsave();
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DEBUGVERIFY(clock_gettime(CLOCK_REALTIME, &abstime));
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abstime.tv_sec += timeout->tv_sec;
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abstime.tv_nsec += timeout->tv_nsec;
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if (abstime.tv_nsec > 1000000000)
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{
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abstime.tv_sec++;
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abstime.tv_nsec -= 1000000000;
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}
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/* REVISIT: If sem_timedwait() is awakened with signal, we will return
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* the wrong error code.
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*/
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(void)sem_timedwait(¬ify->nt_sem, &abstime);
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ret = notify->nt_result;
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/* Remove our wait structure from the list (we may no longer be at the
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* head of the list).
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*/
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(void)icmpv6_wait_cancel(notify);
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/* Re-enable interrupts and return the result of the wait */
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irqrestore(flags);
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return ret;
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}
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/****************************************************************************
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* Function: icmpv6_notify
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*
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* Description:
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* Called each time that a Neighbor Advertisement is received in order to
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* wake-up any threads that may be waiting for this particular Neighbor
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* Advertisement.
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*
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* Assumptions:
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* This function is called from the MAC device driver indirectly through
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* icmpv6_icmpv6in() will execute with the network locked.
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*
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****************************************************************************/
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void icmpv6_notify(net_ipv6addr_t ipaddr)
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{
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FAR struct icmpv6_notify_s *curr;
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/* Find an entry with the matching IP address in the list of waiters */
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for (curr = g_icmpv6_waiters; curr; curr = curr->nt_flink)
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{
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/* Does this entry match? If the result is okay, then we have
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* already notified this waiter and it has not yet taken the
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* entry from the list.
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*/
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if (curr->nt_result != OK && curr->nt_ipaddr == ipaddr)
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{
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/* Yes.. Signal the waiting, returning success */
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curr->nt_result = OK;
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sem_post(&curr->nt_sem);
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break;
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}
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}
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}
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#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
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