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https://github.com/apache/nuttx.git
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186 lines
7.6 KiB
C
186 lines
7.6 KiB
C
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/****************************************************************************
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* net/mld/mld_leave.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 <netinet/in.h>
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#include <nuttx/wdog.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/ip.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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#ifdef CONFIG_NET_MLD
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_leavegroup
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*
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* Description:
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* Remove the specified group address to the group.
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*
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* State transition diagram for a router in Querier state (RFC 2710):
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* ________________
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* | |
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* | |timer expired
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* timer expired| |(notify routing -,
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* (notify routing -)| No Listeners |clear rxmt tmr)
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* ------->| Present |<---------
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* | | | |
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* | | | |
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* | |________________| | ---------------
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* | | | | rexmt timer |
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* | report received| | | expired |
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* | (notify routing +,| | | (send m-a-s |
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* | start timer)| | | query, |
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* __________|______ | ________|_|______ st rxmt |
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* | |<------------ | | tmr) |
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* | | | |<-------
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* | | report received | |
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* | | (start timer, | |
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* | | clear rxmt tmr) | |
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* | Listeners |<-------------------| Checking |
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* | Present | done received | Listeners |
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* | | (start timer*, | |
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* | | start rxmt timer, | |
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* | | send m-a-s query) | |
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* --->| |------------------->| |
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* | |_________________| |_________________|
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* | report received |
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* | (start timer) |
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* -----------------
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*
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* State transition diagram for a router in Non-Querier state is
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* similar, but non-Queriers do not send any messages and are only
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* driven by message reception.
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*
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* ________________
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* | |
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* | |
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* timer expired| |timer expired
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* (notify routing -)| No Listeners |(notify routing -)
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* --------->| Present |<---------
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* | | | |
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* | | | |
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* | | | |
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* | |________________| |
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* | | |
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* | |report received |
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* | |(notify routing +,|
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* | | start timer) |
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* ________|________ | ________|________
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* | |<--------- | |
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* | | report received | |
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* | | (start timer) | |
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* | Listeners |<-------------------| Checking |
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* | Present | m-a-s query rec'd | Listeners |
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* | | (start timer*) | |
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* ---->| |------------------->| |
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* | |_________________| |_________________|
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* | report received |
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* | (start timer) |
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* -----------------
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*
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****************************************************************************/
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int mld_leavegroup(struct net_driver_s *dev, FAR const struct in6_addr *grpaddr)
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{
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struct mld_group_s *group;
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DEBUGASSERT(dev != NULL && grpaddr != NULL);
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/* Find the entry corresponding to the address leaving the group */
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group = mld_grpfind(dev, grpaddr->s6_addr16);
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ninfo("Leaving group: %p\n", group);
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if (group != NULL)
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{
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/* Cancel the timer and discard any queued Reports. Canceling the
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* timer will prevent any new Reports from being sent; clearing the
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* flags will discard any pending Reports that could interfere with
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* leaving the group.
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*/
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net_lock();
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wd_cancel(group->wdog);
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CLR_MLD_SCHEDMSG(group->flags);
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CLR_MLD_WAITMSG(group->flags);
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net_unlock();
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MLD_STATINCR(g_netstats.mld.leaves);
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/* Send a leave if the flag is set according to the state diagram */
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if (IS_MLD_LASTREPORT(group->flags))
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{
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ninfo("Schedule Leave Group message\n");
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MLD_STATINCR(g_netstats.mld.done_sched);
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mld_waitmsg(group, ICMPV6_MCAST_LISTEN_DONE_V1);
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}
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/* Free the group structure */
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mld_grpfree(dev, group);
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/* And remove the group address from the ethernet drivers MAC filter set */
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mld_removemcastmac(dev, grpaddr->s6_addr16);
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return OK;
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}
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/* Return ENOENT if the address is not a member of the group */
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ninfo("Return -ENOENT\n");
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return -ENOENT;
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}
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#endif /* CONFIG_NET_MLD */
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