/**************************************************************************** * net/mld/mld_report.c * * Copyright (C) 2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "devif/devif.h" #include "mld/mld.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: mld_report * * Description: * Common report handling. Since we are not a router, we do very little * on the receipt of a report from another member of the group. * ****************************************************************************/ int mld_report(FAR struct net_driver_s *dev, FAR const net_ipv6addr_t grpaddr) { FAR struct mld_group_s *group; /* Reports are send to the group multicast address. Hence, the IPv6 * destipaddr idenfies the group. */ mldinfo("grpaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", grpaddr[0], grpaddr[1], grpaddr[2], grpaddr[3], grpaddr[4], grpaddr[5], grpaddr[6], grpaddr[7]); #ifdef CONFIG_NET_MLD_ROUTER /* Assure that the group address is an IPv6 multicast address */ if (!net_is_addr_mcast(mrec->ipv6mr_multiaddr.s6_addr16)) { return -EINVAL; } group = mld_grpallocfind(dev, grpaddr); if (group == NULL) { mlderr("ERROR: Failed to allocate group\n"); return -ENOMEM; } #else /* Find the group using the incoming IP address. If we are not a router, * then can ignore reports from groups that we are not a member of. */ group = mld_grpfind(dev, grpaddr); if (group == NULL) { mldinfo("WARNING: Ignoring group. We are not a member\n"); return -ENOENT; } #endif /* There are certainly other members of this group, we can clear the * LASTREPORT flag. */ CLR_MLD_LASTREPORT(group->flags); #ifdef CONFIG_NET_MLD_ROUTER /* Increment the number of members that reported in this query cycle. */ group->members++; #endif /* Need to set d_len to zero to indication that nothing is being sent */ dev->d_len = 0; return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: mld_report_v1 * * Description: * Called from icmpv6_input() when a Version 1 or Version 2 Multicast * Listener Report is received. * * If a node receives another node's Report from an interface for a * multicast address while it has a timer running for that same address * on that interface, it stops its timer and does not send a Report for * that address, thus suppressing duplicate reports on the link. * * When a router receives a Report from a link, if the reported address * is not already present in the router's list of multicast address * having listeners on that link, the reported address is added to the * list, its timer is set, and its appearance is made known to the router's * multicast routing component. If a Report is received for a multicast * address that is already present in the router's list, the timer for that * address is reset. If an address's timer expires, it is assumed that * there are no longer any listeners for that address present on the link, * so it is deleted from the list and its disappearance is made known to * the multicast routing component. * * A node MUST accept and process any version 1 Report whose IP * Destination Address field contains *any* of the IPv6 addresses (unicast * or multicast) assigned to the interface on which the Report arrives. * ****************************************************************************/ int mld_report_v1(FAR struct net_driver_s *dev, FAR const struct mld_mcast_listen_report_v1_s *report) { mldinfo("Version 1 Multicast Listener Report\n"); DEBUGASSERT(dev != NULL && report != NULL); MLD_STATINCR(g_netstats.mld.v1report_received); return mld_report(dev, report->mcastaddr); } /**************************************************************************** * Name: mld_report_v2 * * Description: * Called from icmpv6_input() when a Version 2 Multicast Listener Report is * received. * * Upon reception of an MLD message that contains a Report, the router * checks if the source address of the message is a valid link-local * address, if the Hop Limit is set to 1, and if the Router Alert option * is present in the Hop-By-Hop Options header of the IPv6 packet. If * any of these checks fails, the packet is dropped. If the validity of * the MLD message is verified, the router starts to process the Report. * * Version 2 Multicast Listener Reports are sent with an IP destination * address of FF02:0:0:0:0:0:0:16, to which all MLDv2-capable multicast * routers listen * ****************************************************************************/ int mld_report_v2(FAR struct net_driver_s *dev, FAR const struct mld_mcast_listen_report_v2_s *report) { int ret = -ENOENT; int i; mldinfo("Version 2 Multicast Listener Report\n"); DEBUGASSERT(dev != NULL && report != NULL); MLD_STATINCR(g_netstats.mld.v2report_received); for (i = 0; i < report->naddrec; i++) { /* Handle this mcast address in the list */ int status = mld_report(dev, report->addrec[i].mcast); if (status == OK) { /* Return success if any address in the listed was processed */ ret = OK; } else if (status != -ENOENT) { /* Any result other than -ENOENT would be a problem */ ret = status; break; } } return ret; }