854046a931
net/icmpv6/icmpv6_input.c: Correct caculation of the ICMPv6 header address
net/mld/mld_query.c: Correct back test for group found.
net/mld/mld_report.c: Fix host vs. network order problem.
net/mld/mld_send.c: Correct the address used in sending the General Query. It should be the unspecified address in that case.
net/mld: Querying workaround. The MLD implementation does not follow the RFC correct when it is the Querier. The Querier should use a general query and get query messages from all members of all groups. This would be driven by a single timer since all groups are queried at once. Instead, the design currently uses a Multicast Address Specific Query with one timer per group and ignores groups that we are not members of.
222 lines
7.8 KiB
C
222 lines
7.8 KiB
C
/****************************************************************************
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* net/mld/mld_report.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/wdog.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/netdev.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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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_report
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*
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* Description:
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* Common report handling. Since we are not a router, we do very little
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* on the receipt of a report from another member of the group.
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*
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****************************************************************************/
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int mld_report(FAR struct net_driver_s *dev, FAR const net_ipv6addr_t grpaddr)
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{
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FAR struct mld_group_s *group;
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/* Reports are send to the group multicast address. Hence, the IPv6
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* destipaddr idenfies the group.
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*/
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mldinfo("grpaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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grpaddr[0], grpaddr[1], grpaddr[2], grpaddr[3],
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grpaddr[4], grpaddr[5], grpaddr[6], grpaddr[7]);
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#ifdef CONFIG_NET_MLD_ROUTER
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/* Assure that the group address is an IPv6 multicast address */
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if (!net_is_addr_mcast(mrec->ipv6mr_multiaddr.s6_addr16))
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{
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return -EINVAL;
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}
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group = mld_grpallocfind(dev, grpaddr);
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if (group == NULL)
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{
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mlderr("ERROR: Failed to allocate group\n");
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return -ENOMEM;
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}
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#else
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/* Find the group using the incoming IP address. If we are not a router,
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* then can ignore reports from groups that we are not a member of.
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*/
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group = mld_grpfind(dev, grpaddr);
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if (group == NULL)
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{
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mldinfo("WARNING: Ignoring group. We are not a member\n");
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return -ENOENT;
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}
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#endif
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/* There are certainly other members of this group, we can clear the
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* LASTREPORT flag.
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*/
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CLR_MLD_LASTREPORT(group->flags);
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#ifdef CONFIG_NET_MLD_ROUTER
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/* Increment the number of members that reported in this query cycle. */
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group->members++;
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#endif
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/* Need to set d_len to zero to indication that nothing is being sent */
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dev->d_len = 0;
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_report_v1
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*
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* Description:
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* Called from icmpv6_input() when a Version 1 or Version 2 Multicast
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* Listener Report is received.
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*
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* If a node receives another node's Report from an interface for a
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* multicast address while it has a timer running for that same address
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* on that interface, it stops its timer and does not send a Report for
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* that address, thus suppressing duplicate reports on the link.
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*
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* When a router receives a Report from a link, if the reported address
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* is not already present in the router's list of multicast address
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* having listeners on that link, the reported address is added to the
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* list, its timer is set, and its appearance is made known to the router's
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* multicast routing component. If a Report is received for a multicast
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* address that is already present in the router's list, the timer for that
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* address is reset. If an address's timer expires, it is assumed that
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* there are no longer any listeners for that address present on the link,
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* so it is 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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* A node MUST accept and process any version 1 Report whose IP
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* Destination Address field contains *any* of the IPv6 addresses (unicast
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* or multicast) assigned to the interface on which the Report arrives.
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*
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****************************************************************************/
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int mld_report_v1(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_report_v1_s *report)
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{
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mldinfo("Version 1 Multicast Listener Report\n");
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DEBUGASSERT(dev != NULL && report != NULL);
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MLD_STATINCR(g_netstats.mld.v1report_received);
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return mld_report(dev, report->mcastaddr);
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}
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/****************************************************************************
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* Name: mld_report_v2
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*
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* Description:
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* Called from icmpv6_input() when a Version 2 Multicast Listener Report is
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* received.
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*
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* Upon reception of an MLD message that contains a Report, the router
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* checks if the source address of the message is a valid link-local
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* address, if the Hop Limit is set to 1, and if the Router Alert option
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* is present in the Hop-By-Hop Options header of the IPv6 packet. If
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* any of these checks fails, the packet is dropped. If the validity of
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* the MLD message is verified, the router starts to process the Report.
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*
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* Version 2 Multicast Listener Reports are sent with an IP destination
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* address of FF02:0:0:0:0:0:0:16, to which all MLDv2-capable multicast
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* routers listen
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*
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****************************************************************************/
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int mld_report_v2(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_report_v2_s *report)
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{
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uint16_t naddrec;
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int ret = -ENOENT;
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int i;
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mldinfo("Version 2 Multicast Listener Report\n");
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DEBUGASSERT(dev != NULL && report != NULL);
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MLD_STATINCR(g_netstats.mld.v2report_received);
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naddrec = NTOHS(report->naddrec);
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for (i = 0; i < naddrec; i++)
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{
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/* Handle this mcast address in the list */
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int status = mld_report(dev, report->addrec[i].mcast);
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if (status == OK)
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{
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/* Return success if any address in the listed was processed */
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ret = OK;
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}
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else if (status != -ENOENT)
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{
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/* Any result other than -ENOENT would be a problem */
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ret = status;
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break;
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}
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}
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return ret;
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}
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