1c15aa3b2d
net/mld: More updates from comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
net/mld: More updated from comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
net/mld: Beginning comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
112 lines
4.4 KiB
C
112 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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* Pre-processor Definitions
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****************************************************************************/
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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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_v1
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*
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* Description:
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* Called from icmpv6_input() when a Version 1 Multicast Listener Done is
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* 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_v1(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_done_v1_s *done)
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{
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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct mld_group_s *group;
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MLD_STATINCR(g_netstats.mld.done_received);
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/* Find the group (or create a new one) using the incoming IP address */
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group = mld_grpfind(dev, ipv6->destipaddr);
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if (group == NULL)
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{
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return -ENOENT; /* REVISIT: Or should it return OK? */
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}
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/* Ignore the Done message is this is not a Querier */
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if (IS_MLD_QUERIER(group->flags))
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{
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/* REVISIT: Here we just remove the group from this list immediately.
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* The RFC requires that we send Multicast-Address-Specific Queries
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* repeatedly before doing this to assure that the listener is not
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* present.
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*/
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mld_grpfree(dev, group);
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}
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return OK;
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}
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