nuttx/net/icmpv6/icmpv6_advertise.c

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/****************************************************************************
* net/icmpv6/icmpv6_advertise.c
* Send an ICMPv6 Neighbor Advertisement
*
* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Adapted for NuttX from logic in uIP which also has a BSD-like license:
*
* Original author Adam Dunkels <adam@dunkels.com>
* Copyright () 2001-2003, Adam Dunkels.
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/netconfig.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/net.h>
#include <nuttx/net/icmpv6.h>
#include "netdev/netdev.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 IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
#define ICMPv6ADVERTISE \
((struct icmpv6_neighbor_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_advertise
*
* Description:
* Send an ICMPv6 Neighbor Advertisement
*
* Parameters:
* dev - The device driver structure containing the outgoing ICMPv6 packet
* buffer
*
* Return:
* None
*
* Assumptions:
* The network is locked
*
****************************************************************************/
void icmpv6_advertise(FAR struct net_driver_s *dev,
const net_ipv6addr_t destipaddr)
{
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
FAR struct icmpv6_neighbor_advertise_s *adv;
uint16_t lladdrsize;
uint16_t l3size;
/* Set up the IPv6 header */
ipv6->vtc = 0x60; /* Version/traffic class (MS) */
ipv6->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
ipv6->flow = 0; /* Flow label (LS) */
/* Length excludes the IPv6 header */
lladdrsize = netdev_dev_lladdrsize(dev);
l3size = SIZEOF_ICMPV6_NEIGHBOR_ADVERTISE_S(lladdrsize);
ipv6->len[0] = (l3size >> 8);
ipv6->len[1] = (l3size & 0xff);
ipv6->proto = IP_PROTO_ICMP6; /* Next header */
ipv6->ttl = 255; /* Hop limit */
/* Swap source for destination IP address, add our source IP address */
net_ipv6addr_copy(ipv6->destipaddr, destipaddr);
net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Neighbor Advertise response */
adv = ICMPv6ADVERTISE;
adv->type = ICMPv6_NEIGHBOR_ADVERTISE; /* Message type */
adv->code = 0; /* Message qualifier */
adv->flags[0] = ICMPv6_NADV_FLAG_S | ICMPv6_NADV_FLAG_O; /* Solicited+Override flags. */
adv->flags[1] = 0;
adv->flags[2] = 0;
adv->flags[3] = 0;
/* Copy the target address into the Neighbor Advertisement message */
net_ipv6addr_copy(adv->tgtaddr, dev->d_ipv6addr);
/* Set up the options */
adv->opttype = ICMPv6_OPT_TGTLLADDR; /* Option type */
adv->optlen = ICMPv6_OPT_OCTECTS(lladdrsize); /* Option length in octets */
/* Copy our link layer address into the message
* REVISIT: What if the link layer is not Ethernet?
*/
memcpy(adv->tgtlladdr, &dev->d_mac, lladdrsize);
/* Calculate the checksum over both the ICMP header and payload */
adv->chksum = 0;
adv->chksum = ~icmpv6_chksum(dev);
/* Set the size to the size of the IPv6 header and the payload size */
dev->d_len = IPv6_HDRLEN + l3size;
#ifdef CONFIG_NET_ETHERNET
/* Add the size of the Ethernet header */
dev->d_len += ETH_HDRLEN;
/* Move the source and to the destination addresses in the Ethernet header
* and use our MAC as the new source address
*/
if (dev->d_lltype == NET_LL_ETHERNET)
{
FAR struct eth_hdr_s *eth = ETHBUF;
memcpy(eth->dest, eth->src, ETHER_ADDR_LEN);
memcpy(eth->src, dev->d_mac.ether.ether_addr_octet, ETHER_ADDR_LEN);
/* Set the IPv6 Ethernet type */
eth->type = HTONS(ETHTYPE_IP6);
}
#endif
/* No additional neighbor lookup is required on this packet (We are using
* a multicast address).
*/
IFF_SET_NOARP(dev->d_flags);
ninfo("Outgoing ICMPv6 Neighbor Advertise length: %d (%d)\n",
dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmpv6.sent++;
g_netstats.ipv6.sent++;
#endif
}
#endif /* CONFIG_NET_ICMPv6 */