263 lines
8.6 KiB
C
263 lines
8.6 KiB
C
/****************************************************************************
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* net/igmp/igmp_timer.c
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*
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* Copyright (C) 2010-2011 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 contributors
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* may be 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 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 LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <wdog.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/uip.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/igmp.h>
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#include "uip/uip.h"
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#include "igmp/igmp.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 CONFIG_CPP_HAVE_VARARGS
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# ifdef IGMP_GTMRDEBUG
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# define gtmrdbg(format, ...) ndbg(format, ##__VA_ARGS__)
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# define gtmrlldbg(format, ...) nlldbg(format, ##__VA_ARGS__)
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# define gtmrvdbg(format, ...) nvdbg(format, ##__VA_ARGS__)
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# define gtmrllvdbg(format, ...) nllvdbg(format, ##__VA_ARGS__)
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# else
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# define gtmrdbg(x...)
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# define gtmrlldbg(x...)
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# define gtmrvdbg(x...)
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# define gtmrllvdbg(x...)
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# endif
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#else
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# ifdef IGMP_GTMRDEBUG
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# define gtmrdbg ndbg
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# define gtmrlldbg nlldbg
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# define gtmrvdbg nvdbg
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# define gtmrllvdbg nllvdbg
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# else
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# define gtmrdbg (void)
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# define gtmrlldbg (void)
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# define gtmrvdbg (void)
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# define gtmrllvdbg (void)
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# endif
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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
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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(int argc, uint32_t arg, ...)
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{
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FAR struct igmp_group_s *group;
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/* If the state is DELAYING_MEMBER then we send a report for this group */
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nllvdbg("Timeout!\n");
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group = (FAR struct igmp_group_s *)arg;
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DEBUGASSERT(argc == 1 && group);
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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 a leave.
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*/
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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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igmp_schedmsg(group, IGMPv2_MEMBERSHIP_REPORT);
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/* Also note: The Membership Report is sent at most two times becasue
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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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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: igmp_decisec2tick
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*
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* Description:
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* Convert the deci-second value to units of system clock ticks.
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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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int igmp_decisec2tick(int decisecs)
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{
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/* Convert the deci-second comparison value to clock ticks. The CLK_TCK
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* value is the number of clock ticks per second; decisecs argument is the
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* maximum delay in 100's of milliseconds. CLK_TCK/10 is then the number
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* of clock ticks in 100 milliseconds.
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*/
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return CLK_TCK * decisecs / 10;
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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, int ticks)
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{
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int ret;
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/* Start the timer */
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gtmrlldbg("ticks: %d\n", ticks);
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ret = wd_start(group->wdog, ticks, igmp_timeout, 1, (uint32_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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gtmrdbg("decisecs: %d\n", decisecs);
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igmp_startticks(group, igmp_decisec2tick(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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net_lock_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 = net_lock();
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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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gtmrdbg("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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net_unlock(flags);
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return true;
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}
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net_unlock(flags);
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return false;
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}
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#endif /* CONFIG_NET_IGMP */
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