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nuttx/net/icmpv6/icmpv6_radvertise.c

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/****************************************************************************
* net/icmpv6/icmpv6_radvertise.c
* Send an ICMPv6 Router Advertisement
*
* Copyright (C) 2015 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/icmpv6.h>
#include "utils/utils.h"
#include "icmpv6/icmpv6.h"
#ifdef CONFIG_NET_ICMPv6_ROUTER
/****************************************************************************
* Private Types
****************************************************************************/
/* This is the same as struct icmpv6_router_advertise_s, but with the
* source address and prefix options included for simplicity.
*/
struct icmpv6_radvertise_s
{
uint8_t type; /* Message Type: ICMPV6_ROUTER_ADVERTISE */
uint8_t code; /* Further qualifies the ICMP messages */
uint16_t chksum; /* Checksum of ICMP header and data */
uint8_t hoplimit; /* Current hop limit */
uint8_t flags; /* See ICMPv6_RADV_FLAG_* definitions */
uint16_t lifetime; /* Router lifetime */
uint16_t reachable[2]; /* Reachable time */
uint16_t retrans[2]; /* Retransmission timer */
/* Options */
struct icmpv6_srclladdr_s srcaddr;
struct icmpv6_mtu_s mtu;
struct icmpv6_prefixinfo_s prefix;
};
/****************************************************************************
* 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 ICMPv6ADVERTISE \
((struct icmpv6_radvertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Private Data
****************************************************************************/
static const net_ipv6addr_t g_ipv6_prefix =
{
HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
};
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmpv6_radvertise
*
* Description:
* Send an ICMPv6 Router Advertisement
*
* Parameters:
* dev - The device driver structure containing the outgoing ICMPv6 packet
* buffer
*
* Return:
* None
*
* Assumptions:
* The network is locked
*
****************************************************************************/
void icmpv6_radvertise(FAR struct net_driver_s *dev)
{
FAR struct icmpv6_iphdr_s *icmp = ICMPv6BUF;
FAR struct icmpv6_radvertise_s *adv;
FAR struct icmpv6_srclladdr_s *srcaddr;
FAR struct icmpv6_mtu_s *mtu;
FAR struct icmpv6_prefixinfo_s *prefix;
/* Set up the IPv6 header */
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_radvertise_s) >> 8);
icmp->len[1] = (sizeof(struct icmpv6_radvertise_s) & 0xff);
icmp->proto = IP_PROTO_ICMP6; /* Next header */
icmp->ttl = 255; /* Hop limit */
/* Swap source for destination IP address, add our source IP address */
net_ipv6addr_copy(icmp->destipaddr, g_ipv6_allnodes);
net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Router Advertise response */
adv = ICMPv6ADVERTISE;
adv->type = ICMPV6_ROUTER_ADVERTISE; /* Message type */
adv->code = 0; /* Message qualifier */
adv->hoplimit = 64; /* Current hop limit */
adv->flags = ICMPv6_RADV_FLAG_M; /* Managed address flag. */
adv->lifetime = HTONS(1800); /* Router lifetime */
adv->reachable[0] = 0; /* Reachable time */
adv->reachable[1] = 0;
adv->retrans[0] = 0; /* Retransmission timer */
adv->retrans[1] = 0;
/* Set up the source address option */
srcaddr = &adv->srcaddr;
srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
srcaddr->optlen = 1;
memcpy(srcaddr->srclladdr, &dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
/* Set up the MTU option */
mtu = &adv->mtu;
mtu->opttype = ICMPv6_OPT_MTU;
mtu->optlen = 1;
mtu->reserved = 0;
mtu->mtu[0] = HTONS(CONFIG_NET_ETH_MTU >> 8);
mtu->mtu[1] = HTONS(CONFIG_NET_ETH_MTU & 0xff);
/* Set up the prefix option */
prefix = &adv->prefix;
prefix->opttype = ICMPv6_OPT_MTU;
prefix->optlen = 4;
prefix->preflen = CONFIG_NET_ICMPv6_PREFLEN;
prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
prefix->vlifetime[0] = HTONS(2592000 >> 8);
prefix->vlifetime[1] = HTONS(2592000 & 0xff);
prefix->plifetime[0] = HTONS(604800 >> 8);
prefix->plifetime[1] = HTONS(604800 & 0xff);
prefix->reserved[0] = 0;
prefix->reserved[1] = 0;
net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
/* 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_radvertise_s);
#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
*/
#ifdef CONFIG_NET_MULTILINK
if (dev->d_lltype == NET_LL_ETHERNET)
#endif
{
FAR struct eth_hdr_s *eth = ETHBUF;
memcpy(eth->dest, g_ipv6_ethallnodes.ether_addr_octet, ETHER_ADDR_LEN);
memcpy(eth->src, dev->d_mac.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 Router Advertise 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_ROUTER */
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