6c0ab0e077
include/nuttx/net/ipv6ext.h: Fix some terminology: Hop-by-hop, not Hop-to-hop or Hop2hop.
net/devif/ipv6_input.c and net/icmpv6/icmpv6_input.c: Add logic to skiip over the variable number of IPv6 extension headers that may be present between the IPv6 header and the transport layer header. The extension headers are simply ignored. This is necessary because with MLD, certain incoming messages may have, at a mimimum, a Router Alert Hop-by-hop extension header.
net/inet/ipv6_setsockopt.c: Implement the IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP socket options.
212 lines
8.6 KiB
C
212 lines
8.6 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.
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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_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 10*100 msec */
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mld_starttimer(group, 10);
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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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