196 lines
6.7 KiB
C
196 lines
6.7 KiB
C
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/****************************************************************************
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* net/icmpv6/icmpv6_solicit.c
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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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* 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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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/netdev.h>
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#include <nuttx/net/netstats.h>
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#include "devif/devif.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
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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 ICMPv6SOLICIT \
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((struct icmpv6_neighbor_solicit_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 uint16_t g_icmpv_mcastaddr[6] =
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{
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0xff02, 0x0000, 0x0000, 0x0000, 0x0000, 0x0001
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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_solicit
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*
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* Description:
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* Set up to send an ICMPv6 Neighbor Solicitation message
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*
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* Parameters:
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* dev - Reference to an Ethernet device driver structure
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* ipaddr - IP address of Neighbor to be solicited
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*
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* Return:
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* None
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*
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****************************************************************************/
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void icmpv6_solicit(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t ipaddr)
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{
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FAR struct icmpv6_iphdr_s *icmp;
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FAR struct icmpv6_neighbor_solicit_s *sol;
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FAR struct eth_hdr_s *eth;
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/* Set up the IPv6 header (most is probably already in place) */
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icmp = ICMPv6BUF;
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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_neighbor_solicit_s) >> 8);
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icmp->len[1] = (sizeof(struct icmpv6_neighbor_solicit_s) & 0xff);
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icmp->proto = IP_PROTO_ICMP6; /* Next header */
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icmp->ttl = IP_TTL; /* Hop limit */
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/* Set the multicast destination IP address */
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memcpy(icmp->destipaddr, g_icmpv_mcastaddr, 6*sizeof(uint16_t));
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icmp->destipaddr[6] = ipaddr[6] | 0xff00;
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icmp->destipaddr[7] = ipaddr[7];
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/* Add out IPv6 address as the source address */
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net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
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/* Set up the ICMPv6 Neighbor Solicitation message */
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sol = ICMPv6SOLICIT;
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sol->type = ICMPv6_NEIGHBOR_SOLICIT; /* Message type */
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sol->code = 0; /* Message qualifier */
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sol->flags[0] = 0; /* flags */
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sol->flags[1] = 0;
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sol->flags[2] = 0;
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sol->flags[3] = 0;
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sol->opttype = ICMPv6_OPT_SRCLLADDR; /* Option type */
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sol->optlen = 1; /* Option length = 1 octet */
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/* Copy our link layer address into the message
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* REVISIT: What if the link layer is not Ethernet?
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*/
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memcpy(&(sol->srclladdr), &dev->d_mac, IFHWADDRLEN);
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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_neighbor_solicit_s);
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#ifdef CONFIG_NET_ETHERNET
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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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/* Add the size of the Ethernet header */
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dev->d_len += ETH_HDRLEN;
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/* Set the destination IPv6 multicast Ethernet address:
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*
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* For IPv6 multicast addresses, the Ethernet MAC is derived by
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* the four low-order octets OR'ed with the MAC 33:33:00:00:00:00,
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* so for example the IPv6 address FF02:DEAD:BEEF::1:3 would map
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* to the Ethernet MAC address 33:33:00:01:00:03.
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*
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* NOTES: This appears correct for the ICMPv6 Router Solicitation
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* Message, but the ICMPv6 Neighbor Solicitation message seems to
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* use 33:33:ff:01:00:03.
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*/
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eth = ETHBUF;
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eth->dest[0] = 0x33;
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eth->dest[1] = 0x33;
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eth->dest[2] = 0xff;
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eth->dest[3] = ipaddr[6] >> 8;
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eth->dest[4] = ipaddr[7] & 0xff;
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eth->dest[5] = ipaddr[7] >> 8;
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/* Move our source Ethernet addresses into the Ethernet header */
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memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
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}
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#endif
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nllvdbg("Outgoing ICMPv6 Neighbor Solicitation 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.ip.sent++;
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6 */
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