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incubator-nuttx/net/mld/mld_send.c

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/****************************************************************************
* 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 <nuttx/config.h>
#include <string.h>
#include <assert.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 */
#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;
FAR const uint16_t *srcipaddr;
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, false);
/* 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",
NTOHS(destipaddr[0]), NTOHS(destipaddr[1]), NTOHS(destipaddr[2]),
NTOHS(destipaddr[3]), NTOHS(destipaddr[4]), NTOHS(destipaddr[5]),
NTOHS(destipaddr[6]), NTOHS(destipaddr[7]));
srcipaddr = netdev_ipv6_lladdr(dev);
if (srcipaddr == NULL)
{
/* Unspecified address is used when link-local address is not
* available, as described in RFC 3590, Section 4, Page 2.
*/
srcipaddr = g_ipv6_unspecaddr;
}
ipv6_build_header(IPv6BUF, dev->d_sndlen, NEXT_HOPBYBOT_EH,
srcipaddr, 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;
}
}
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