/**************************************************************************** * net/mld/mld_send.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 NuttX 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 THE COPYRIGHT HOLDERS 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 THE * COPYRIGHT OWNER 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 #include #include #include "devif/devif.h" #include "inet/inet.h" #include "utils/utils.h" #include "mld/mld.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Debug */ #undef MLD_DUMPPKT /* Define to enable packet dump */ #ifndef CONFIG_DEBUG_NET # undef MLD_DUMPPKT #endif #ifdef MLD_DUMPPKT # define mld_dumppkt(b,n) lib_dumpbuffer("MLD", (FAR const uint8_t*)(b), (n)) #else # define mld_dumppkt(b,n) #endif /* Buffer layout */ #define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)]) #define RABUF ((FAR struct ipv6_router_alert_s *) \ &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN) #define RASIZE sizeof(struct ipv6_router_alert_s) #define REPORTBUF ((FAR struct mld_mcast_listen_report_v1_s *) \ &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE) #define DONEBUF ((FAR struct mld_mcast_listen_done_v1_s *) \ &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE) /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: mld_send * * Description: * Sends an MLD IP packet on a network interface. This function constructs * the IP header and calculates the IP header checksum. * * Input Parameters: * dev - The device driver structure to use in the send operation. * group - Describes the multicast group member and identifies the * message to be sent. * destipaddr - The IP address of the recipient of the message * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group, FAR const net_ipv6addr_t destipaddr) { FAR struct ipv6_hdr_s *ipv6; FAR struct ipv6_router_alert_s *ra; unsigned int mldsize; ninfo("msgid: %02x \n", group->msgid); ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", destipaddr[0], destipaddr[1], destipaddr[2], destipaddr[3], destipaddr[4], destipaddr[5], destipaddr[6], destipaddr[7]); /* Select IPv6 */ IFF_SET_IPv6(dev->d_flags); /* What is the size of the ICMPv6 payload? Currently only Version 1 * REPORT and DONE packets are sent (these are actually the same size). * This will change. */ switch (group->msgid) { case ICMPV6_MCAST_LISTEN_REPORT_V1: mldsize = sizeof(struct mld_mcast_listen_report_v1_s); break; case ICMPV6_MCAST_LISTEN_DONE_V1: mldsize = sizeof(struct mld_mcast_listen_done_v1_s); break; /* Not yet supported */ case ICMPV6_MCAST_LISTEN_QUERY: case ICMPV6_MCAST_LISTEN_REPORT_V2: default: DEBUGPANIC(); return; } /* The total length to send is the size of the IPv6 header, 4 bytes for the * ROUTER ALERT, and the MLD ICMPv6 payload (and, eventually, the Ethernet * header length) */ dev->d_len = IPv6_HDRLEN + RASIZE + mldsize; /* The total size of the data is the size of the ICMPv6 payload */ dev->d_sndlen = mldsize; /* Set up the IPv6 header */ ipv6 = IPv6BUF; ipv6->vtc = 0x60; /* Version/traffic class (MS) */ ipv6->tcf = 0; /* Traffic class(LS)/Flow label(MS) */ ipv6->flow = 0; /* Flow label (LS) */ ipv6->len[0] = (dev->d_sndlen >> 8); /* Length excludes the IPv6 header */ ipv6->len[1] = (dev->d_sndlen & 0xff); ipv6->proto = NEXT_HOPBYBOT_EH; /* Hop-to-hop extension header */ ipv6->ttl = MLD_TTL; /* MLD Time-to-live */ net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr); net_ipv6addr_hdrcopy(ipv6->destipaddr, destipaddr); /* Add the router alert IP header option. * * The IPv6 router alert option (type 5) is defined in RFC 2711. */ ra = RABUF; memset(ra, 0, RASIZE); ra->h2h.nxthdr = IP_PROTO_ICMP6; /* ICMPv6 payload follows extension header */ ra->h2h.len = 1; /* One 8-octect option follows */ ra->type = HOP2HOP_ROUTER_ALERT; /* Router alert */ ra->len = 2; /* Length */ /* Format the MLD ICMPv6 payload into place after the IPv6 header (with * router alert) */ switch (group->msgid) { case ICMPV6_MCAST_LISTEN_REPORT_V1: { FAR struct mld_mcast_listen_report_v1_s *report = REPORTBUF; /* Initializer the Report payload */ memset(report, 0, sizeof(struct mld_mcast_listen_report_v1_s)); report->type = ICMPV6_MCAST_LISTEN_REPORT_V1; net_ipv6addr_hdrcopy(report->mcastaddr, &group->grpaddr); /* Calculate the ICMPv6 checksum. */ report->chksum = 0; report->chksum = ~icmpv6_chksum(dev); MLD_STATINCR(g_netstats.mld.report_sent); } break; case ICMPV6_MCAST_LISTEN_DONE_V1: { FAR struct mld_mcast_listen_done_v1_s *done = DONEBUF; /* Initializer the Done payload */ memset(done, 0, sizeof(struct mld_mcast_listen_done_v1_s)); done->type = ICMPV6_MCAST_LISTEN_DONE_V1; net_ipv6addr_hdrcopy(done->mcastaddr, &group->grpaddr); /* Calculate the ICMPv6 checksum. */ done->chksum = 0; done->chksum = ~icmpv6_chksum(dev); MLD_STATINCR(g_netstats.mld.done_sent); } break; /* Not yet supported */ case ICMPV6_MCAST_LISTEN_QUERY: case ICMPV6_MCAST_LISTEN_REPORT_V2: default: DEBUGPANIC(); return; } MLD_STATINCR(g_netstats.icmpv6.sent); MLD_STATINCR(g_netstats.ipv6.sent); ninfo("Outgoing ICMPv6 MLD packet length: %d (%d)\n", dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]); mld_dumppkt(RA, IPMLD_HDRLEN + RASIZE); }