/**************************************************************************** * 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 "devif/devif.h" #include "mld/mld.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)]) /**************************************************************************** * 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. * ****************************************************************************/ int mld_report_v1(FAR struct net_driver_s *dev, FAR const struct mld_mcast_listen_report_v1_s *report) { FAR struct ipv6_hdr_s *ipv6 = IPv6BUF; FAR struct mld_group_s *group; ninfo("Version 1 Multicast Listener Report\n"); ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", ipv6->destipaddr[0], ipv6->destipaddr[1], ipv6->destipaddr[2], ipv6->destipaddr[3], ipv6->destipaddr[4], ipv6->destipaddr[5], ipv6->destipaddr[6], ipv6->destipaddr[7]); MLD_STATINCR(g_netstats.mld.v1report_received); /* Find the group (or create a new one) using the incoming IP address */ group = mld_grpallocfind(dev, ipv6->destipaddr); if (group == NULL) { nerr("ERROR: Failed to allocate/find group\n"); return -ENOENT; } /* If we are a Querier, then reset the timer for that group. */ if (IS_MLD_QUERIER(group->flags)) { mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC)); CLR_MLD_LASTREPORT(group->flags); } return OK; } /**************************************************************************** * 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. * ****************************************************************************/ int mld_report_v2(FAR struct net_driver_s *dev, FAR const struct mld_mcast_listen_report_v2_s *report) { FAR struct ipv6_hdr_s *ipv6 = IPv6BUF; FAR struct mld_group_s *group; ninfo("Version 2 Multicast Listener Report\n"); ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", ipv6->destipaddr[0], ipv6->destipaddr[1], ipv6->destipaddr[2], ipv6->destipaddr[3], ipv6->destipaddr[4], ipv6->destipaddr[5], ipv6->destipaddr[6], ipv6->destipaddr[7]); MLD_STATINCR(g_netstats.mld.v2report_received); /* Check for a valid report * * REVISIT: Missing required test for Router Alert option. That has * already been handled in ipv6_input() but is not available here * unless we re-parse the extension options. */ if (!net_is_addr_linklocal(ipv6->srcipaddr) || ipv6->ttl != 1) { nwarn("WARNING: Bad Report, ttl=%u\n", ipv6->ttl); nwarn(" srcipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", ipv6->srcipaddr[0], ipv6->srcipaddr[1], ipv6->srcipaddr[2], ipv6->srcipaddr[3], ipv6->srcipaddr[4], ipv6->srcipaddr[5], ipv6->srcipaddr[6], ipv6->srcipaddr[7]); return -EINVAL; } /* Find the group (or create a new one) using the incoming IP address */ group = mld_grpallocfind(dev, ipv6->destipaddr); if (group == NULL) { nerr("ERROR: Failed to allocate/find group\n"); return -ENOENT; } /* If we are a Querier, then reset the timer for that group. */ if (IS_MLD_QUERIER(group->flags)) { mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC)); CLR_MLD_LASTREPORT(group->flags); } return OK; }