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
7.2 KiB
C
187 lines
7.2 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/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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* Pre-processor Definitions
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****************************************************************************/
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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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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****************************************************************************/
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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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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct mld_group_s *group;
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ninfo("Version 1 Multicast Listener Report\n");
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ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ipv6->destipaddr[0], ipv6->destipaddr[1], ipv6->destipaddr[2],
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ipv6->destipaddr[3], ipv6->destipaddr[4], ipv6->destipaddr[5],
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ipv6->destipaddr[6], ipv6->destipaddr[7]);
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MLD_STATINCR(g_netstats.mld.v1report_received);
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/* Find the group (or create a new one) using the incoming IP address */
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group = mld_grpallocfind(dev, ipv6->destipaddr);
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if (group == NULL)
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{
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nerr("ERROR: Failed to allocate/find group\n");
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return -ENOENT;
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}
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/* If we are a Querier, then reset the timer for that group. */
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if (IS_MLD_QUERIER(group->flags))
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{
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mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC));
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CLR_MLD_LASTREPORT(group->flags);
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}
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return OK;
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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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****************************************************************************/
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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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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct mld_group_s *group;
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ninfo("Version 2 Multicast Listener Report\n");
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ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ipv6->destipaddr[0], ipv6->destipaddr[1], ipv6->destipaddr[2],
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ipv6->destipaddr[3], ipv6->destipaddr[4], ipv6->destipaddr[5],
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ipv6->destipaddr[6], ipv6->destipaddr[7]);
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MLD_STATINCR(g_netstats.mld.v2report_received);
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/* Check for a valid report
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*
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* REVISIT: Missing required test for Router Alert option. That has
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* already been handled in ipv6_input() but is not available here
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* unless we re-parse the extension options.
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*/
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if (!net_is_addr_linklocal(ipv6->srcipaddr) || ipv6->ttl != 1)
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{
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nwarn("WARNING: Bad Report, ttl=%u\n", ipv6->ttl);
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nwarn(" srcipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ipv6->srcipaddr[0], ipv6->srcipaddr[1], ipv6->srcipaddr[2],
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ipv6->srcipaddr[3], ipv6->srcipaddr[4], ipv6->srcipaddr[5],
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ipv6->srcipaddr[6], ipv6->srcipaddr[7]);
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return -EINVAL;
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}
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/* Find the group (or create a new one) using the incoming IP address */
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group = mld_grpallocfind(dev, ipv6->destipaddr);
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if (group == NULL)
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{
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nerr("ERROR: Failed to allocate/find group\n");
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return -ENOENT;
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}
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/* If we are a Querier, then reset the timer for that group. */
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if (IS_MLD_QUERIER(group->flags))
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{
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mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC));
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CLR_MLD_LASTREPORT(group->flags);
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}
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return OK;
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}
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