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Gregory Nutt
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net/icmpv6/icmpv6_radvertise.c
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254
net/icmpv6/icmpv6_radvertise.c
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/****************************************************************************
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* net/icmpv6/icmpv6_radvertise.c
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* Send an ICMPv6 Router Advertisement
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/icmpv6.h>
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#include "utils/utils.h"
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_ROUTER
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This is the same as struct icmpv6_router_advertise_s, but with the
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* source address and prefix options included for simplicity.
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*/
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struct icmpv6_radvertise_s
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{
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uint8_t type; /* Message Type: ICMPV6_ROUTER_ADVERTISE */
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uint8_t code; /* Further qualifies the ICMP messages */
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uint16_t chksum; /* Checksum of ICMP header and data */
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uint8_t hoplimit; /* Current hop limit */
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uint8_t flags; /* See ICMPv6_RADV_FLAG_* definitions */
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uint16_t lifetime; /* Router lifetime */
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uint16_t reachable[2]; /* Reachable time */
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uint16_t retrans[2]; /* Retransmission timer */
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/* Options */
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struct icmpv6_srclladdr_s srcaddr;
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struct icmpv6_mtu_s mtu;
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struct icmpv6_prefixinfo_s prefix;
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};
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
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#define ICMPv6BUF ((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6ADVERTISE \
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((struct icmpv6_radvertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const net_ipv6addr_t g_ipv6_prefix =
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{
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HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_radvertise
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*
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* Description:
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* Send an ICMPv6 Router Advertisement
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*
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* Parameters:
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* dev - The device driver structure containing the outgoing ICMPv6 packet
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* buffer
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*
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* Return:
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* None
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*
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* Assumptions:
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* The network is locked
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*
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****************************************************************************/
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void icmpv6_radvertise(FAR struct net_driver_s *dev)
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{
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FAR struct icmpv6_iphdr_s *icmp = ICMPv6BUF;
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FAR struct icmpv6_radvertise_s *adv;
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FAR struct icmpv6_srclladdr_s *srcaddr;
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FAR struct icmpv6_mtu_s *mtu;
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FAR struct icmpv6_prefixinfo_s *prefix;
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/* Set up the IPv6 header */
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icmp->vtc = 0x60; /* Version/traffic class (MS) */
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icmp->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
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icmp->flow = 0; /* Flow label (LS) */
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/* Length excludes the IPv6 header */
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icmp->len[0] = (sizeof(struct icmpv6_radvertise_s) >> 8);
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icmp->len[1] = (sizeof(struct icmpv6_radvertise_s) & 0xff);
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icmp->proto = IP_PROTO_ICMP6; /* Next header */
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icmp->ttl = 255; /* Hop limit */
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/* Swap source for destination IP address, add our source IP address */
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net_ipv6addr_copy(icmp->destipaddr, g_ipv6_allnodes);
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net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
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/* Set up the ICMPv6 Router Advertise response */
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adv = ICMPv6ADVERTISE;
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adv->type = ICMPV6_ROUTER_ADVERTISE; /* Message type */
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adv->code = 0; /* Message qualifier */
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adv->hoplimit = 64; /* Current hop limit */
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adv->flags = ICMPv6_RADV_FLAG_M; /* Managed address flag. */
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adv->lifetime = HTONS(1800); /* Router lifetime */
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adv->reachable[0] = 0; /* Reachable time */
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adv->reachable[1] = 0;
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adv->retrans[0] = 0; /* Retransmission timer */
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adv->retrans[1] = 0;
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/* Set up the source address option */
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srcaddr = &adv->srcaddr;
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srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
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srcaddr->optlen = 1;
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memcpy(srcaddr->srclladdr, &dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
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/* Set up the MTU option */
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mtu = &adv->mtu;
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mtu->opttype = ICMPv6_OPT_MTU;
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mtu->optlen = 1;
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mtu->reserved = 0;
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mtu->mtu[0] = HTONS(CONFIG_NET_ETH_MTU >> 8);
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mtu->mtu[1] = HTONS(CONFIG_NET_ETH_MTU & 0xff);
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/* Set up the prefix option */
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prefix = &adv->prefix;
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prefix->opttype = ICMPv6_OPT_MTU;
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prefix->optlen = 4;
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prefix->preflen = CONFIG_NET_ICMPv6_PREFLEN;
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prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
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prefix->vlifetime[0] = HTONS(2592000 >> 8);
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prefix->vlifetime[1] = HTONS(2592000 & 0xff);
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prefix->plifetime[0] = HTONS(604800 >> 8);
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prefix->plifetime[1] = HTONS(604800 & 0xff);
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prefix->reserved[0] = 0;
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prefix->reserved[1] = 0;
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net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
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/* Calculate the checksum over both the ICMP header and payload */
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icmp->chksum = 0;
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icmp->chksum = ~icmpv6_chksum(dev);
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/* Set the size to the size of the IPv6 header and the payload size */
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dev->d_len = IPv6_HDRLEN + sizeof(struct icmpv6_radvertise_s);
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#ifdef CONFIG_NET_ETHERNET
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/* Add the size of the Ethernet header */
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dev->d_len += ETH_HDRLEN;
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/* Move the source and to the destination addresses in the Ethernet header
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* and use our MAC as the new source address
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*/
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#ifdef CONFIG_NET_MULTILINK
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if (dev->d_lltype == NET_LL_ETHERNET)
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#endif
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{
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FAR struct eth_hdr_s *eth = ETHBUF;
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memcpy(eth->dest, g_ipv6_ethallnodes.ether_addr_octet, ETHER_ADDR_LEN);
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memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
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/* Set the IPv6 Ethernet type */
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eth->type = HTONS(ETHTYPE_IP6);
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}
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#endif
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/* No additional neighbor lookup is required on this packet (We are using
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* a multicast address).
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*/
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IFF_SET_NOARP(dev->d_flags);
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nllvdbg("Outgoing ICMPv6 Router Advertise length: %d (%d)\n",
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dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6_ROUTER */
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