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nuttx/net/icmpv6/icmpv6_solicit.c

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/****************************************************************************
* net/icmpv6/icmpv6_solicit.c
*
* Copyright (C) 2015 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 <stdint.h>
#include <string.h>
#include <debug.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/netstats.h>
#include "devif/devif.h"
#include "utils/utils.h"
#include "icmpv6/icmpv6.h"
#ifdef CONFIG_NET_ICMPv6
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
#define ICMPv6BUF ((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
#define ICMPv6SOLICIT \
((struct icmpv6_neighbor_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Private Data
****************************************************************************/
/* First 6 swords of the multi-cast address in network byte order */
static const uint16_t g_icmpv_mcastaddr[6] =
{
HTONS(0xff02), HTONS(0x0000), HTONS(0x0000), HTONS(0x0000),
HTONS(0x0000), HTONS(0x0001)
};
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_solicit
*
* Description:
* Set up to send an ICMPv6 Neighbor Solicitation message. This version
* is for a standalone solicitation. If formats:
*
* - The Ethernet header
* - The IPv6 header
* - The ICMPv6 Neighbor Solicitation Message
*
* Parameters:
* dev - Reference to an Ethernet device driver structure
* ipaddr - IP address of Neighbor to be solicited
*
* Return:
* None
*
****************************************************************************/
void icmpv6_solicit(FAR struct net_driver_s *dev,
FAR const net_ipv6addr_t ipaddr)
{
FAR struct icmpv6_iphdr_s *icmp;
FAR struct icmpv6_neighbor_solicit_s *sol;
FAR struct eth_hdr_s *eth;
/* Set up the IPv6 header (most is probably already in place) */
icmp = ICMPv6BUF;
icmp->vtc = 0x60; /* Version/traffic class (MS) */
icmp->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
icmp->flow = 0; /* Flow label (LS) */
/* Length excludes the IPv6 header */
icmp->len[0] = (sizeof(struct icmpv6_neighbor_solicit_s) >> 8);
icmp->len[1] = (sizeof(struct icmpv6_neighbor_solicit_s) & 0xff);
icmp->proto = IP_PROTO_ICMP6; /* Next header */
icmp->ttl = 255; /* Hop limit */
/* Set the multicast destination IP address */
memcpy(icmp->destipaddr, g_icmpv_mcastaddr, 6*sizeof(uint16_t));
icmp->destipaddr[6] = ipaddr[6] | HTONS(0xff00);
icmp->destipaddr[7] = ipaddr[7];
/* Add out IPv6 address as the source address */
net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Neighbor Solicitation message */
sol = ICMPv6SOLICIT;
sol->type = ICMPv6_NEIGHBOR_SOLICIT; /* Message type */
sol->code = 0; /* Message qualifier */
sol->flags[0] = 0; /* flags */
sol->flags[1] = 0;
sol->flags[2] = 0;
sol->flags[3] = 0;
/* Copy the target address into the Neighbor Solicitation message */
net_ipv6addr_copy(sol->tgtaddr, ipaddr);
/* Set up the options */
sol->opttype = ICMPv6_OPT_SRCLLADDR; /* Option type */
sol->optlen = 1; /* Option length = 1 octet */
/* Copy our link layer address into the message
* REVISIT: What if the link layer is not Ethernet?
*/
memcpy(sol->srclladdr, &dev->d_mac, IFHWADDRLEN);
/* Calculate the checksum over both the ICMP header and payload */
icmp->chksum = 0;
icmp->chksum = ~icmpv6_chksum(dev);
/* Set the size to the size of the IPv6 header and the payload size */
dev->d_len = IPv6_HDRLEN + sizeof(struct icmpv6_neighbor_solicit_s);
#ifdef CONFIG_NET_ETHERNET
#ifdef CONFIG_NET_MULTILINK
if (dev->d_lltype == NET_LL_ETHERNET)
#endif
{
/* Set the destination IPv6 multicast Ethernet address:
*
* For IPv6 multicast addresses, the Ethernet MAC is derived by
* the four low-order octets OR'ed with the MAC 33:33:00:00:00:00,
* so for example the IPv6 address FF02:DEAD:BEEF::1:3 would map
* to the Ethernet MAC address 33:33:00:01:00:03.
*
* NOTES: This appears correct for the ICMPv6 Router Solicitation
* Message, but the ICMPv6 Neighbor Solicitation message seems to
* use 33:33:ff:01:00:03.
*/
eth = ETHBUF;
eth->dest[0] = 0x33;
eth->dest[1] = 0x33;
eth->dest[2] = 0xff;
eth->dest[3] = ipaddr[6] >> 8;
eth->dest[4] = ipaddr[7] & 0xff;
eth->dest[5] = ipaddr[7] >> 8;
/* Move our source Ethernet addresses into the Ethernet header */
memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
/* Set the IPv6 Ethernet type */
eth->type = HTONS(ETHTYPE_IP6);
#if 0
/* No additional neighbor lookup is required on this packet.
* REVISIT: It is inappropriate to set this bit if we get here
* via neighbor_out(); It is no necessary to set this bit if we
* get here via icmpv6_input(). Is it ever necessary?
*/
IFF_SET_NOARP(dev->d_flags);
#endif
}
#endif
/* Add the size of the layer layer header to the total size of the
* outgoing packet.
*/
#if defined(CONFIG_NET_MULTILINK)
dev->d_len += dev->d_llhdrlen;
#elif defined(CONFIG_NET_ETHERNET)
dev->d_len += ETH_HDRLEN;
#else /* if defined(CONFIG_NET_SLIP) */
/* SLIP has no link layer header */
#endif
nllvdbg("Outgoing ICMPv6 Neighbor Solicitation length: %d (%d)\n",
dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmpv6.sent++;
g_netstats.ipv6.sent++;
#endif
}
#endif /* CONFIG_NET_ICMPv6 */
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