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.
187 lines
7.3 KiB
C
187 lines
7.3 KiB
C
/****************************************************************************
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* net/mld/mld_join.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/net/netconfig.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_joingroup
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*
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* Description:
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* Add the specified group address to the group. This function
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* implements the logic for the IPV6_JOIN_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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* 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 (See RFC 2710/3810 or net/mld.h).
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*
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****************************************************************************/
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int mld_joingroup(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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DEBUGASSERT(dev != NULL && 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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ninfo("Join 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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/* Check if a this address is already in 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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/* No... allocate a new entry */
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ninfo("Allocate new group entry\n");
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group = mld_grpalloc(dev, mrec->ipv6mr_multiaddr.s6_addr16);
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if (group == NULL)
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{
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return -ENOMEM;
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}
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MLD_STATINCR(g_netstats.mld.joins);
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/* Send the Version 1 Multicast Listener Report */
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MLD_STATINCR(g_netstats.mld.report_sched);
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mld_waitmsg(group, ICMPV6_MCAST_LISTEN_REPORT_V1);
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/* And start the timer at 1 second */
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SET_MLD_STARTUP(group->flags);
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group->count = MLD_UNSOLREPORT_COUNT - 1;
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mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC));
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/* Add the group (MAC) address to the Ethernet drivers MAC filter list */
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mld_addmcastmac(dev, mrec->ipv6mr_multiaddr.s6_addr16);
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return OK;
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}
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/* Return EEXIST if the address is already a member of the group */
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return -EEXIST;
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}
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#endif /* CONFIG_NET_MLD */
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