220 lines
7.4 KiB
C
220 lines
7.4 KiB
C
/****************************************************************************
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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 "netdev/netdev.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. This function
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* implements the logic for the IPV6_LEAVE_GROUP socket option.
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*
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* The IPV6_JOIN_GROUP socket option is used to join a multicast group.
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* This is accomplished by using the setsockopt() API and specifying the
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* address of the ipv6_mreq structure containing the IPv6 multicast address
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* and the local IPv6 multicast interface index. The stack chooses a
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* default multicast interface if an interface index of 0 is passed. The
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* values specified in the IPV6_MREQ structure used by IPV6_JOIN_GROUP
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* and IPV6_LEAVE_GROUP must be symmetrical. The format of the ipv6_mreq
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* structure can be found in include/netinet/in.h
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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int mld_leavegroup(FAR const struct ipv6_mreq *mrec)
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{
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FAR struct net_driver_s *dev;
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struct mld_group_s *group;
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int ret;
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DEBUGASSERT(mrec != NULL);
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/* Get the device from the interface index. Use the default network device
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* if an interface index of 0 is provided.
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*/
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if (mrec->ipv6mr_interface == 0)
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{
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dev = netdev_default();
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}
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else
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{
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dev = netdev_findbyindex(mrec->ipv6mr_interface);
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}
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if (dev == NULL)
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{
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return -ENODEV;
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}
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mldinfo("Leave group: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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mrec->ipv6mr_multiaddr.s6_addr16[0],
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mrec->ipv6mr_multiaddr.s6_addr16[1],
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mrec->ipv6mr_multiaddr.s6_addr16[2],
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mrec->ipv6mr_multiaddr.s6_addr16[3],
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mrec->ipv6mr_multiaddr.s6_addr16[4],
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mrec->ipv6mr_multiaddr.s6_addr16[5],
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mrec->ipv6mr_multiaddr.s6_addr16[5],
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mrec->ipv6mr_multiaddr.s6_addr16[7]);
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/* Find the entry corresponding to the address leaving the group */
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group = mld_grpfind(dev, mrec->ipv6mr_multiaddr.s6_addr16);
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if (group != NULL)
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{
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mldinfo("Leaving group: %p\n", group);
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/* Indicate one fewer members of the group from this host */
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DEBUGASSERT(group->njoins > 0);
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group->njoins--;
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MLD_STATINCR(g_netstats.mld.nleaves);
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/* Take no further actions if there are other members of this group
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* on this host.
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*/
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if (group->njoins > 0)
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{
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return OK;
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}
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/* Perform actions that would be performed only when the number of
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* njoins from this host goes to zero.
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*/
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if (group->njoins == 0)
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{
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/* Send a leave if the LASTREPORT flag is set for the group. If
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* there are other members of the group, then their reports will
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* clear the LAST REPORT flag. In this case we know that there are
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* other members of the group and we do not have to send the Done
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* message.
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*
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* The MLDv1 router responds to the Done message with a multicast-
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* address- specific (MAS) Query. If any other node responds to
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* the Query with a Report message the there are still listeners
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* present.
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*/
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if (IS_MLD_LASTREPORT(group->flags))
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{
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mldinfo("Schedule Done message\n");
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MLD_STATINCR(g_netstats.mld.done_sched);
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/* REVIST: This will interfere is the are any other tasks
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* waiting for a message to be sent. Can that happen?
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*/
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ret = mld_waitmsg(group, MLD_SEND_DONE);
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if (ret < 0)
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{
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mlderr("ERROR: Failed to schedule message: %d\n", ret);
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}
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}
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/* Remove the group address from the Ethernet drivers MAC filter
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* set
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*/
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mld_removemcastmac(dev, mrec->ipv6mr_multiaddr.s6_addr16);
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/* Perform additional the number of members not on this host is
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* also zero.
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*/
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#ifdef CONFIG_NET_MLD_ROUTER
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if (group->members == 0 && group->lstmbrs == 0)
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#endif
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{
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/* Cancel the timers and discard any queued Reports. Canceling
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* the timer will prevent any new Reports from being sent;
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* clearing the flags will discard any pending Reports that
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* could interfere with freeing the group.
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*/
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wd_cancel(group->polldog);
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CLR_MLD_SCHEDMSG(group->flags);
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CLR_MLD_WAITMSG(group->flags);
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/* Free the group structure */
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mld_grpfree(dev, group);
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/* REVISIT: It is expected that higher level logic will remove
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* the routing table entry for the old multicast address. That
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* is not done here.
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*/
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}
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}
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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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mldinfo("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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