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.
279 lines
9.3 KiB
C
279 lines
9.3 KiB
C
/****************************************************************************
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* net/mld/mld_send.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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF 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 <string.h>
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#include <debug.h>
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#include <arpa/inet.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.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/ipv6ext.h>
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#include <nuttx/net/tcp.h>
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#include <nuttx/net/mld.h>
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#include "devif/devif.h"
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#include "inet/inet.h"
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#include "utils/utils.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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/* Debug */
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#undef MLD_DUMPPKT /* Define to enable packet dump */
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#ifndef CONFIG_DEBUG_NET
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# undef MLD_DUMPPKT
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#endif
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#ifdef MLD_DUMPPKT
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# define mld_dumppkt(b,n) lib_dumpbuffer("MLD", (FAR const uint8_t*)(b), (n))
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#else
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# define mld_dumppkt(b,n)
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#endif
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/* Buffer layout */
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define RABUF ((FAR struct ipv6_router_alert_s *) \
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&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN)
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#define RASIZE sizeof(struct ipv6_router_alert_s)
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#define QUERYBUF ((FAR struct mld_mcast_listen_query_s *) \
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&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
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#define REPORTBUF ((FAR struct mld_mcast_listen_report_v1_s *) \
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&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
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#define DONEBUF ((FAR struct mld_mcast_listen_done_v1_s *) \
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&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_send
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*
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* Description:
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* Sends an MLD IP packet on a network interface. This function constructs
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* the IP header and calculates the IP header checksum.
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation.
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* group - Describes the multicast group member and identifies the
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* message to be sent.
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* destipaddr - The IP address of the recipient of the message
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group,
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FAR const net_ipv6addr_t destipaddr)
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{
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FAR struct ipv6_hdr_s *ipv6;
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FAR struct ipv6_router_alert_s *ra;
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unsigned int mldsize;
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ninfo("msgtype: %02x \n", group->msgtype);
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ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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destipaddr[0], destipaddr[1], destipaddr[2], destipaddr[3],
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destipaddr[4], destipaddr[5], destipaddr[6], destipaddr[7]);
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/* Select IPv6 */
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IFF_SET_IPv6(dev->d_flags);
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/* What is the size of the ICMPv6 payload? Currently only Version 1
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* REPORT and DONE packets are sent (these are actually the same size).
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* This will change.
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*/
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switch (group->msgtype)
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{
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case MLD_SEND_GENQUERY: /* Send General Query */
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mldsize = SIZEOF_MLD_MCAST_LISTEN_QUERY_S(0);
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break;
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case MLD_SEND_REPORT: /* Send Unsolicited report */
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mldsize = sizeof(struct mld_mcast_listen_report_v1_s);
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break;
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case MLD_SEND_DONE: /* Send Done message */
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mldsize = sizeof(struct mld_mcast_listen_done_v1_s);
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break;
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default:
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DEBUGPANIC();
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return;
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}
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/* The total length to send is the size of the IPv6 header, 4 bytes for the
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* ROUTER ALERT, and the MLD ICMPv6 payload (and, eventually, the Ethernet
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* header length)
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*/
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dev->d_len = IPv6_HDRLEN + RASIZE + mldsize;
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/* The total size of the data is the size of the ICMPv6 payload */
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dev->d_sndlen = mldsize;
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/* Set up the IPv6 header */
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ipv6 = IPv6BUF;
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ipv6->vtc = 0x60; /* Version/traffic class (MS) */
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ipv6->tcf = 0; /* Traffic class(LS)/Flow label(MS) */
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ipv6->flow = 0; /* Flow label (LS) */
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ipv6->len[0] = (dev->d_sndlen >> 8); /* Length excludes the IPv6 header */
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ipv6->len[1] = (dev->d_sndlen & 0xff);
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ipv6->proto = NEXT_HOPBYBOT_EH; /* Hop-to-hop extension header */
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ipv6->ttl = MLD_TTL; /* MLD Time-to-live */
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net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
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net_ipv6addr_hdrcopy(ipv6->destipaddr, destipaddr);
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/* Add the router alert IP header option.
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*
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* The IPv6 router alert option (type 5) is defined in RFC 2711.
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*/
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ra = RABUF;
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memset(ra, 0, RASIZE);
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ra->hbyh.nxthdr = IP_PROTO_ICMP6; /* ICMPv6 payload follows extension header */
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ra->hbyh.len = 1; /* One 8-octet option follows */
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ra->type = HOPBYHOP_ROUTER_ALERT; /* Router alert */
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ra->len = 2; /* Length */
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/* Format the MLD ICMPv6 payload into place after the IPv6 header (with
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* router alert)
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*/
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switch (group->msgtype)
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{
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case MLD_SEND_GENQUERY:
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{
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FAR struct mld_mcast_listen_query_s *query = QUERYBUF;
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/* Initializer the Query payload. In a General Query, both the
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* Multicast Address field and the Number of Sources (N)
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* field are zero.
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*/
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memset(query, 0, sizeof(struct mld_mcast_listen_report_v1_s));
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net_ipv6addr_hdrcopy(query->grpaddr, &group->grpaddr);
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query->type = ICMPV6_MCAST_LISTEN_QUERY;
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query->mrc = MLD_QRESP_MSEC;
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query->flags = MLD_ROBUSTNESS;
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query->qqic = MLD_QRESP_SEC;
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/* Calculate the ICMPv6 checksum. */
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query->chksum = 0;
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query->chksum = ~icmpv6_chksum(dev);
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MLD_STATINCR(g_netstats.mld.query_sent);
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}
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break;
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case MLD_SEND_REPORT:
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{
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FAR struct mld_mcast_listen_report_v1_s *report = REPORTBUF;
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/* Initializer the Report payload */
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memset(report, 0, sizeof(struct mld_mcast_listen_report_v1_s));
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net_ipv6addr_hdrcopy(report->mcastaddr, &group->grpaddr);
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report->type = ICMPV6_MCAST_LISTEN_REPORT_V1;
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/* Calculate the ICMPv6 checksum. */
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report->chksum = 0;
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report->chksum = ~icmpv6_chksum(dev);
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MLD_STATINCR(g_netstats.mld.report_sent);
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}
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break;
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case MLD_SEND_DONE:
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{
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FAR struct mld_mcast_listen_done_v1_s *done = DONEBUF;
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/* Initializer the Done payload */
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memset(done, 0, sizeof(struct mld_mcast_listen_done_v1_s));
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done->type = ICMPV6_MCAST_LISTEN_DONE_V1;
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net_ipv6addr_hdrcopy(done->mcastaddr, &group->grpaddr);
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/* Calculate the ICMPv6 checksum. */
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done->chksum = 0;
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done->chksum = ~icmpv6_chksum(dev);
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MLD_STATINCR(g_netstats.mld.done_sent);
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}
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break;
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/* Not yet supported */
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case ICMPV6_MCAST_LISTEN_QUERY:
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case ICMPV6_MCAST_LISTEN_REPORT_V2:
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default:
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DEBUGPANIC();
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return;
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}
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MLD_STATINCR(g_netstats.icmpv6.sent);
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MLD_STATINCR(g_netstats.ipv6.sent);
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ninfo("Outgoing ICMPv6 MLD packet length: %d (%d)\n",
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dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
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mld_dumppkt(RA, IPMLD_HDRLEN + RASIZE);
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}
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