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nuttx/net/mld/mld_send.c

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/****************************************************************************
* net/mld/mld_send.c
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <string.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/ipv6ext.h>
#include <nuttx/net/tcp.h>
#include <nuttx/net/mld.h>
#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 QUERYBUF ((FAR struct mld_mcast_listen_query_s *) \
&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
#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.
* 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_hdr_s *ipv6;
FAR struct ipv6_router_alert_s *ra;
FAR const uint16_t *destipaddr;
unsigned int mldsize;
/* 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 (msgtype)
{
case MLD_SEND_GENQUERY: /* Send General Query */
ninfo("Send General Query, flags=%02x\n", group->flags);
mldsize = SIZEOF_MLD_MCAST_LISTEN_QUERY_S(0);
break;
case MLD_SEND_REPORT: /* Send Unsolicited report */
ninfo("Send Report, flags=%02x\n", group->flags);
mldsize = sizeof(struct mld_mcast_listen_report_v1_s);
break;
case MLD_SEND_DONE: /* Send Done message */
ninfo("Send Done message, flags=%02x\n", group->flags);
mldsize = sizeof(struct mld_mcast_listen_done_v1_s);
break;
default:
nerr("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 = 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 */
/* Select the IPv6 source address (the local interface assigned to the
* network device).
*/
net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
/* 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
* Report Message: The group 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_REPORT: /* Send Unsolicited report */
destipaddr = group->grpaddr;
break;
case MLD_SEND_DONE: /* Send Done message */
destipaddr = g_ipv6_allrouters;
break;
}
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]);
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->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 */
ra->len = 2; /* Length */
/* Format the MLD ICMPv6 payload into place after the IPv6 header (with
* router alert)
*/
switch (msgtype)
{
case MLD_SEND_GENQUERY:
{
FAR struct mld_mcast_listen_query_s *query = QUERYBUF;
/* Initializer the Query payload. In a General Query, both the
* Multicast Address field and the Number of Sources (N)
* field are zero.
*/
memset(query, 0, sizeof(struct mld_mcast_listen_report_v1_s));
net_ipv6addr_hdrcopy(query->grpaddr, &group->grpaddr);
query->type = ICMPV6_MCAST_LISTEN_QUERY;
query->mrc = MLD_QRESP_MSEC;
query->flags = MLD_ROBUSTNESS;
query->qqic = MLD_QRESP_SEC;
/* Calculate the ICMPv6 checksum. */
query->chksum = 0;
query->chksum = ~icmpv6_chksum(dev);
MLD_STATINCR(g_netstats.mld.query_sent);
}
break;
case MLD_SEND_REPORT:
{
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));
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);
SET_MLD_LASTREPORT(group->flags); /* Remember we were the last to report */
MLD_STATINCR(g_netstats.mld.report_sent);
}
break;
case MLD_SEND_DONE:
{
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;
}
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);
}
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