02f83334d5
net/mld: Fix a couple of places where I forgot to unlock the network in the previous commit.
net/mld: Implement 'Other Querier Present Timer'. This timer is used to revert to Querier mode if there is no other querier on the network. Also, fix some naming: The Done message is not just Version 1 but is used with Version 2 as well.
net/igmp: Back out some blind, backported improvements to IGMP from MLD. There are too many subtle differences in the protocols for this to be safe.
102 lines
4.4 KiB
C
102 lines
4.4 KiB
C
/****************************************************************************
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* net/mld/mld_done.c
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*
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* Copyright (C) 2018 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 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 <assert.h>
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#include <debug.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/mld.h>
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#include "devif/devif.h"
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#include "mld/mld.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_done
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*
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* Description:
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* Called from icmpv6_input() when a Multicast Listener Done is received.
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*
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* When a router in Querier state receives a Done message from a link,
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* if the Multicast Address identified in the message is present in the
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* Querier's list of addresses having listeners on that link, the Querier
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* periodically sends multiple Multicast-Address-Specific Queries to that
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* multicast address. If no Reports for the address are received from the
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* link after the maximum response delay in the Multicast-Address-Specific
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* Queries of the last query has passed, the routers on the link assume
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* that the address no longer has any listeners there; the address is
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* therefore deleted from the list and its disappearance is made known to
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* the multicast routing component.
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*
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* Routers in Non-Querier state MUST ignore Done messages.
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*
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****************************************************************************/
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int mld_done(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_done_s *done)
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{
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mldinfo("Multicast Listener Done\n");
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MLD_STATINCR(g_netstats.mld.done_received);
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/* The Done message is sent to the link-local, all routers multicast
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* address. We basically ignore the Done message:
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*
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* We cannot free the group if there are other members of the group. We
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* know how many local tasks have joined the group, but we are less
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* certain of how many non-local members of the group there are.
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*
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* The RFC requires that we send Multicast-Address-Specific Queries
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* repeatedly before removing the group to assure that the no listeners
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* are present.
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*
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* If we are the Querier, then the Query timer logic will accomplish
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* this requirement for us. If there is another Querier on the subnet,
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* it will drive the Queries. No Querier? We will let the 'Other
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* Querier Present Timeout' handle that case.
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*/
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/* Need to set d_len to zero to indication that nothing is being sent */
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dev->d_len = 0;
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return OK;
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}
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