269 lines
8.4 KiB
C
269 lines
8.4 KiB
C
/****************************************************************************
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* net/igmp/igmp_timer.c
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2010-2011, 2014, 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
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* lwIP TCP/IP stack by Steve Reynolds:
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*
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* Copyright (c) 2002 CITEL Technologies Ltd.
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* All rights reserved.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of CITEL Technologies Ltd nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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 <nuttx/compiler.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/wdog.h>
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#include <nuttx/irq.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/igmp.h>
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#include "devif/devif.h"
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#include "igmp/igmp.h"
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#include "utils/utils.h"
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#ifdef CONFIG_NET_IGMP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Debug ********************************************************************/
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#undef IGMP_GTMRDEBUG /* Define to enable detailed IGMP group debug */
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#ifndef CONFIG_NET_IGMP
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# undef IGMP_GTMRDEBUG
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#endif
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#ifdef IGMP_GTMRDEBUG
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# define gtmrerr nerr
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# define gtmrinfo ninfo
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#else
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# define gtmrerr _none
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# define gtmrinfo _none
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: igmp_timeout_work
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*
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* Description:
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* Timeout watchdog work.
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*
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* Assumptions:
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* This function is called from a work queue thread.
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*
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****************************************************************************/
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static void igmp_timeout_work(FAR void *arg)
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{
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FAR struct igmp_group_s *group;
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int ret;
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/* If the state is DELAYING_MEMBER then we send a report for this group */
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group = (FAR struct igmp_group_s *)arg;
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DEBUGASSERT(group != NULL);
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/* If the group exists and is no an IDLE MEMBER, then it must be a DELAYING
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* member. Race conditions are avoided because (1) the timer is not started
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* until after the first IGMPv2_MEMBERSHIP_REPORT during the join, and (2)
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* the timer is cancelled before sending the IGMP_LEAVE_GROUP during leave.
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*/
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net_lock();
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if (!IS_IDLEMEMBER(group->flags))
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{
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/* Schedule (and forget) the Membership Report. NOTE:
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* Since we are executing from a timer interrupt, we cannot wait
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* for the message to be sent.
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*/
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IGMP_STATINCR(g_netstats.igmp.report_sched);
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ret = igmp_schedmsg(group, IGMPv2_MEMBERSHIP_REPORT);
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if (ret < 0)
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{
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nerr("ERROR: Failed to schedule message: %d\n", ret);
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}
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/* Also note: The Membership Report is sent at most two times because
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* the timer is not reset here. Hmm.. does this mean that the group
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* is stranded if both reports were lost? This is consistent with the
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* RFC that states: "To cover the possibility of the initial Membership
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* Report being lost or damaged, it is recommended that it be repeated
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* once or twice after short delays [Unsolicited Report Interval]..."
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*/
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}
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net_unlock();
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}
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/****************************************************************************
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* Name: igmp_timeout
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*
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* Description:
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* Timeout watchdog handler.
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*
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* Assumptions:
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* This function is called from the wdog timer handler which runs in the
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* context of the timer interrupt handler.
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*
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****************************************************************************/
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static void igmp_timeout(wdparm_t arg)
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{
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FAR struct igmp_group_s *group;
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int ret;
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ninfo("Timeout!\n");
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/* Recover the reference to the group */
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group = (FAR struct igmp_group_s *)arg;
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DEBUGASSERT(group != NULL);
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/* Perform the timeout-related operations on (preferably) the low priority
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* work queue.
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*/
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ret = work_queue(LPWORK, &group->work, igmp_timeout_work, group, 0);
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if (ret < 0)
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{
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nerr("ERROR: Failed to queue timeout work: %d\n", ret);
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}
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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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* Name: igmp_startticks and igmp_starttimer
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*
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* Description:
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* Start the IGMP timer with differing time units (ticks or deciseconds).
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*
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* Assumptions:
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* This function may be called from most any context.
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*
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****************************************************************************/
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void igmp_startticks(FAR struct igmp_group_s *group, unsigned int ticks)
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{
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int ret;
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/* Start the timer */
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gtmrinfo("ticks: %d\n", ticks);
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ret = wd_start(&group->wdog, ticks, igmp_timeout, (wdparm_t)group);
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DEBUGASSERT(ret == OK);
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UNUSED(ret);
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}
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void igmp_starttimer(FAR struct igmp_group_s *group, uint8_t decisecs)
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{
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/* Convert the decisec value to system clock ticks and start the timer.
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* Important!! this should be a random timer from 0 to decisecs
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*/
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gtmrinfo("decisecs: %d\n", decisecs);
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igmp_startticks(group, net_dsec2tick(decisecs));
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}
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/****************************************************************************
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* Name: igmp_cmptimer
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*
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* Description:
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* Compare the timer remaining on the watching timer to the deci-second
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* value. If maxticks > ticks-remaining, then (1) cancel the timer (to
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* avoid race conditions) and return true.
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*
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* Assumptions:
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* This function may be called from most any context. If true is returned
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* then the caller must call igmp_startticks() to restart the timer
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*
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****************************************************************************/
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bool igmp_cmptimer(FAR struct igmp_group_s *group, int maxticks)
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{
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irqstate_t flags;
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int remaining;
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/* Disable interrupts so that there is no race condition with the actual
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* timer expiration.
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*/
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flags = enter_critical_section();
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/* Get the timer remaining on the watchdog. A time of <= zero means that
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* the watchdog was never started.
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*/
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remaining = wd_gettime(&group->wdog);
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/* A remaining time of zero means that the watchdog was never started
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* or has already expired. That case should be covered in the following
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* test as well.
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*/
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gtmrinfo("maxticks: %d remaining: %d\n", maxticks, remaining);
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if (maxticks > remaining)
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{
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/* Cancel the watchdog timer and return true */
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wd_cancel(&group->wdog);
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leave_critical_section(flags);
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return true;
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}
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leave_critical_section(flags);
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return false;
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}
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#endif /* CONFIG_NET_IGMP */
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