201 lines
6.7 KiB
C
201 lines
6.7 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_rsolicit.c
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*
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* Copyright (C) 2015, 2017 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 "netdev/netdev.h"
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#include "inet/inet.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_AUTOCONF
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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 IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6RSOLICIT \
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((struct icmpv6_router_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_rsolicit
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*
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* Description:
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* Set up to send an ICMPv6 Router Solicitation message. This version
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* is for a standalone solicitation. If formats:
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*
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* - The Ethernet header
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* - The IPv6 header
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* - The ICMPv6 Router Solicitation Message
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*
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* The device IP address should have been set to the link local address
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* prior to calling this function.
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*
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* Input Parameters:
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* dev - Reference to an Ethernet device driver structure
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void icmpv6_rsolicit(FAR struct net_driver_s *dev)
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{
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FAR struct ipv6_hdr_s *ipv6;
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FAR struct icmpv6_router_solicit_s *sol;
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FAR struct eth_hdr_s *eth;
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uint16_t lladdrsize;
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uint16_t l3size;
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/* Set up the IPv6 header (most is probably already in place) */
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ipv6 = IPv6BUF;
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ipv6->vtc = 0x60; /* Version/traffic class (MS) */
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ipv6->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
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ipv6->flow = 0; /* Flow label (LS) */
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/* Length excludes the IPv6 header */
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lladdrsize = netdev_dev_lladdrsize(dev);
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l3size = SIZEOF_ICMPV6_ROUTER_SOLICIT_S(lladdrsize);
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ipv6->len[0] = (l3size >> 8);
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ipv6->len[1] = (l3size & 0xff);
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ipv6->proto = IP_PROTO_ICMP6; /* Next header */
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ipv6->ttl = 255; /* Hop limit */
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/* Set the multicast destination IP address to the IPv6 all link-
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* loocal routers address: ff02::2
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*/
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net_ipv6addr_copy(ipv6->destipaddr, g_ipv6_allrouters);
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/* Add our link local IPv6 address as the source address */
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net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
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/* Set up the ICMPv6 Router Solicitation message */
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sol = ICMPv6RSOLICIT;
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sol->type = ICMPV6_ROUTER_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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/* Set up the options */
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sol->opttype = ICMPv6_OPT_SRCLLADDR; /* Option type */
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sol->optlen = ICMPv6_OPT_OCTECTS(lladdrsize); /* Option length in octets */
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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, lladdrsize);
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/* Calculate the checksum over both the ICMP header and payload */
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sol->chksum = 0;
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sol->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 + l3size;
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#ifdef CONFIG_NET_ETHERNET
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if (dev->d_lltype == NET_LL_ETHERNET)
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{
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/* Set the destination IPv6 all-routers multicast Ethernet
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* address
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*/
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eth = ETHBUF;
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memcpy(eth->dest, g_ipv6_ethallrouters.ether_addr_octet, ETHER_ADDR_LEN);
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/* Move our source Ethernet addresses into the Ethernet header */
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memcpy(eth->src, dev->d_mac.ether.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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#if 0
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/* No additional neighbor lookup is required on this packet.
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* REVISIT: It is inappropriate to set this bit if we get here
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* via neighbor_out(); It is no necessary to set this bit if we
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* get here via icmpv6_input(). Is it ever necessary?
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*/
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IFF_SET_NOARP(dev->d_flags);
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#endif
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}
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#endif
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/* Add the size of the layer layer header to the total size of the
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* outgoing packet.
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*/
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dev->d_len += netdev_ipv6_hdrlen(dev);
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ninfo("Outgoing ICMPv6 Router Solicitation length: %d (%d)\n",
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dev->d_len, (ipv6->len[0] << 8) | ipv6->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_AUTOCONF */
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