/**************************************************************************** * net/mld/mld_send.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #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 */ #ifdef CONFIG_NET_MLD_TXDUMP # define mld_dumppkt(b,n) lib_dumpbuffer("MLD", (FAR const uint8_t*)(b), (n)) #else # define mld_dumppkt(b,n) #endif /* IPv6 header size with extensions */ #define RASIZE sizeof(struct ipv6_router_alert_s) #define MLD_HDRLEN (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. * msgtype - The type of the message to be sent (see enum mld_msgtype_e) * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group, uint8_t msgtype) { FAR struct ipv6_router_alert_s *ra; FAR const uint16_t *destipaddr; unsigned int mldsize; /* Only a general query message can have a NULL group */ DEBUGASSERT(dev != NULL); DEBUGASSERT(msgtype == MLD_SEND_GENQUERY || group != NULL); /* Prepare device buffer */ if (netdev_iob_prepare(dev, false, 0) != OK) { return; } /* Select IPv6 */ IFF_SET_IPv6(dev->d_flags); /* What is the size of the ICMPv6 payload? */ switch (msgtype) { case MLD_SEND_GENQUERY: /* Send General Query */ case MLD_SEND_MASQUERY: /* Send Multicast Address Specific (MAS) Query */ { mldinfo("Send General/MAS Query, flags=%02x\n", group != NULL ? group->flags : dev->d_mld.flags); mldsize = SIZEOF_MLD_MCAST_LISTEN_QUERY_S(0); } break; case MLD_SEND_V1REPORT: /* Send MLDv1 Report message */ { mldinfo("Send MLDv1 Report, flags=%02x\n", group->flags); mldsize = sizeof(struct mld_mcast_listen_report_v1_s); } break; case MLD_SEND_V2REPORT: /* Send MLDv2 Report message */ { unsigned int addreclen; mldinfo("Send MLDv2 Report, flags=%02x\n", group->flags); addreclen = SIZEOF_MLD_MCAST_ADDREC_V2_S(0, 0); mldsize = SIZEOF_MLD_MCAST_LISTEN_REPORT_V2_S(addreclen); } break; case MLD_SEND_DONE: /* Send Done message */ { mldinfo("Send Done message, flags=%02x\n", group->flags); mldsize = sizeof(struct mld_mcast_listen_done_s); } break; default: { mlderr("Bad msgtype: %02x\n", msgtype); 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 = MLD_HDRLEN + mldsize; /* The total size of the data is the size of the ICMPv6 payload PLUS the * size of the IPv6 extension headers. */ dev->d_sndlen = RASIZE + mldsize; /* Update device buffer length */ iob_update_pktlen(dev->d_iob, dev->d_len); /* Select the IPv6 destination address. * This varies with the type of message being sent: * * MESSAGE DESTINATION ADDRESS * General Query Message: The link-local, all nodes multicast address. * MAS Query Messages: The group multicast address. * V1 Report Message: The group multicast address. * V2 Report Message: The link-local, all MLDv2 router multicast * address. * Done Message: The link-local, all routers multicast address. */ switch (msgtype) { case MLD_SEND_GENQUERY: /* Send General Query */ destipaddr = g_ipv6_allnodes; break; case MLD_SEND_MASQUERY: /* Send Multicast Address Specific (MAS) Query */ case MLD_SEND_V1REPORT: /* Send MLDv1 Report message */ destipaddr = group->grpaddr; break; case MLD_SEND_V2REPORT: /* Send MLDv2 Report message */ destipaddr = g_ipv6_allmldv2routers; break; case MLD_SEND_DONE: /* Send Done message */ destipaddr = g_ipv6_allrouters; break; default: /* Can't happen, but eliminates a warning */ return; } mldinfo("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]); ipv6_build_header(IPv6BUF, dev->d_sndlen, NEXT_HOPBYBOT_EH, dev->d_ipv6addr, destipaddr, MLD_TTL, 0); /* Add the router alert IP header option. * * The IPv6 router alert option (type 5) is defined in RFC 2711. */ ra = IPBUF(IPv6_HDRLEN); memset(ra, 0, RASIZE); ra->hbyh.nxthdr = IP_PROTO_ICMP6; /* ICMPv6 payload follows extension header */ ra->hbyh.len = 1; /* One 8-octet option follows */ ra->type = HOPBYHOP_ROUTER_ALERT; /* Router alert */ /* Format the MLD ICMPv6 payload into place after the IPv6 header (with * router alert) */ switch (msgtype) { case MLD_SEND_GENQUERY: /* Send General Query */ case MLD_SEND_MASQUERY: /* Send Multicast Address Specific (MAS) Query */ { FAR struct mld_mcast_listen_query_s *query = IPBUF(MLD_HDRLEN); /* Initialize the Query payload. In a General Query, both the * Multicast Address field and the Number of Sources (N) * field are zero. * * Careful here. In MLDv1 compatibility mode, the MRC is not * encoded and must follow the rules for MLDv1. */ memset(query, 0, sizeof(struct mld_mcast_listen_query_s)); query->type = ICMPV6_MCAST_LISTEN_QUERY; query->mrc = MLD_QRESP_MSEC; /* The General Query and the MAS Query differ only in that the * setting of the group multicast address field. This field * is the unspecified address for General Query, but the group * multicast address for the MAS query. */ if (msgtype == MLD_SEND_GENQUERY) { net_ipv6addr_hdrcopy(query->grpaddr, g_ipv6_unspecaddr); } else { net_ipv6addr_hdrcopy(query->grpaddr, group->grpaddr); } /* Fields unique to the extended MLDv2 query */ if (!IS_MLD_V1COMPAT(dev->d_mld.flags)) { query->flags = MLD_ROBUSTNESS; query->qqic = MLD_QRESP_SEC; } /* Calculate the ICMPv6 checksum. */ query->chksum = 0; query->chksum = ~icmpv6_chksum(dev, MLD_HDRLEN); MLD_STATINCR(g_netstats.mld.query_sent); #ifdef CONFIG_NET_MLD_ROUTER /* Save the number of members that reported in the previous query * cycle; reset the number of members that have reported in the * new query cycle. */ if (msgtype == MLD_SEND_GENQUERY) { /* Update accumulated membership for all groups. */ mld_new_pollcycle(dev); } else { /* Updated accumulated membership only for this group */ group->lstmbrs = group->members; group->members = 0; } #endif } break; case MLD_SEND_V1REPORT: /* Send MLDv1 Report message */ { FAR struct mld_mcast_listen_report_v1_s *report = IPBUF(MLD_HDRLEN); /* Initialize the Report payload */ memset(report, 0, sizeof(struct mld_mcast_listen_report_v1_s)); net_ipv6addr_hdrcopy(report->mcastaddr, &group->grpaddr); report->type = ICMPV6_MCAST_LISTEN_REPORT_V1; /* Calculate the ICMPv6 checksum. */ report->chksum = 0; report->chksum = ~icmpv6_chksum(dev, MLD_HDRLEN); SET_MLD_LASTREPORT(group->flags); /* Remember we were the last to report */ MLD_STATINCR(g_netstats.mld.v1report_sent); } break; case MLD_SEND_V2REPORT: /* Send MLDv2 Report message */ { FAR struct mld_mcast_listen_report_v2_s *report = IPBUF(MLD_HDRLEN); FAR struct mld_mcast_addrec_v2_s *addrec; /* Initialize the Report payload */ memset(report, 0, mldsize); report->type = ICMPV6_MCAST_LISTEN_REPORT_V2; report->naddrec = HTONS(1); addrec = report->addrec; addrec->rectype = MODE_IS_INCLUDE; net_ipv6addr_hdrcopy(addrec->mcast, &group->grpaddr); /* Calculate the ICMPv6 checksum. */ report->chksum = 0; report->chksum = ~icmpv6_chksum(dev, MLD_HDRLEN); SET_MLD_LASTREPORT(group->flags); /* Remember we were the last to report */ MLD_STATINCR(g_netstats.mld.v2report_sent); } break; case MLD_SEND_DONE: /* Send Done message */ { FAR struct mld_mcast_listen_done_s *done = IPBUF(MLD_HDRLEN); /* Initialize the Done payload */ memset(done, 0, sizeof(struct mld_mcast_listen_done_s)); done->type = ICMPV6_MCAST_LISTEN_DONE; net_ipv6addr_hdrcopy(done->mcastaddr, &group->grpaddr); /* Calculate the ICMPv6 checksum. */ done->chksum = 0; done->chksum = ~icmpv6_chksum(dev, MLD_HDRLEN); MLD_STATINCR(g_netstats.mld.done_sent); } break; default: /* Can't happen, but eliminates a warning */ return; } MLD_STATINCR(g_netstats.icmpv6.sent); MLD_STATINCR(g_netstats.ipv6.sent); mldinfo("Outgoing ICMPv6 MLD packet length: %d\n", dev->d_len); mld_dumppkt((FAR const uint8_t *)IPv6BUF, MLD_HDRLEN + mldsize); } /**************************************************************************** * Name: mld_report_msgtype * * Description: * Determine which type of Report to send, MLDv1 or MLDv2, depending on * current state of compatibility mode flag. * ****************************************************************************/ uint8_t mld_report_msgtype(FAR struct net_driver_s *dev) { if (IS_MLD_V1COMPAT(dev->d_mld.flags)) { return MLD_SEND_V1REPORT; } else { return MLD_SEND_V2REPORT; } }