/****************************************************************************
* net/icmpv6/icmpv6_rsolicit.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_AUTOCONF
/****************************************************************************
* 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 ICMPv6RSOLICIT \
((struct icmpv6_router_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_rsolicit
*
* Description:
* Set up to send an ICMPv6 Router Solicitation message. This version
* is for a standalone solicitation. If formats:
*
* - The Ethernet header
* - The IPv6 header
* - The ICMPv6 Router Solicitation Message
*
* The device IP address should have been set to the link local address
* prior to calling this function.
*
* Parameters:
* dev - Reference to an Ethernet device driver structure
*
* Return:
* None
*
****************************************************************************/
void icmpv6_rsolicit(FAR struct net_driver_s *dev)
{
FAR struct icmpv6_iphdr_s *icmp;
FAR struct icmpv6_router_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_router_solicit_s) >> 8);
icmp->len[1] = (sizeof(struct icmpv6_router_solicit_s) & 0xff);
icmp->proto = IP_PROTO_ICMP6; /* Next header */
icmp->ttl = 255; /* Hop limit */
/* Set the multicast destination IP address to the IPv6 all link-
* loocal routers address: ff02::2
*/
net_ipv6addr_copy(icmp->destipaddr, g_ipv6_allrouters);
/* Add our link local IPv6 address as the source address */
net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Router Solicitation message */
sol = ICMPv6RSOLICIT;
sol->type = ICMPV6_ROUTER_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;
/* 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.ether_addr_octet, sizeof(net_ipv6addr_t));
/* 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_router_solicit_s);
#ifdef CONFIG_NET_ETHERNET
#ifdef CONFIG_NET_MULTILINK
if (dev->d_lltype == NET_LL_ETHERNET)
#endif
{
/* Set the destination IPv6 all-routers multicast Ethernet
* address
*/
eth = ETHBUF;
memcpy(eth->dest, g_ipv6_ethallrouters.ether_addr_octet, ETHER_ADDR_LEN);
/* 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.
*/
dev->d_len += netdev_ipv6_hdrlen(dev);
nllvdbg("Outgoing ICMPv6 Router 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_AUTOCONF */