/**************************************************************************** * net/icmpv6/icmpv6_solicit.c * * Copyright (C) 2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include "devif/devif.h" #include "utils/utils.h" #include "icmpv6/icmpv6.h" #ifdef CONFIG_NET_ICMPv6 /**************************************************************************** * 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 ICMPv6SOLICIT \ ((struct icmpv6_neighbor_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN]) /**************************************************************************** * Private Data ****************************************************************************/ /* First 6 swords of the multi-cast address in network byte order */ static const uint16_t g_icmpv_mcastaddr[6] = { HTONS(0xff02), HTONS(0x0000), HTONS(0x0000), HTONS(0x0000), HTONS(0x0000), HTONS(0x0001) }; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: icmpv6_solicit * * Description: * Set up to send an ICMPv6 Neighbor Solicitation message. This version * is for a standalone solicitation. If formats: * * - The Ethernet header * - The IPv6 header * - The ICMPv6 Neighbor Solicitation Message * * Parameters: * dev - Reference to an Ethernet device driver structure * ipaddr - IP address of Neighbor to be solicited * * Return: * None * ****************************************************************************/ void icmpv6_solicit(FAR struct net_driver_s *dev, FAR const net_ipv6addr_t ipaddr) { FAR struct icmpv6_iphdr_s *icmp; FAR struct icmpv6_neighbor_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_neighbor_solicit_s) >> 8); icmp->len[1] = (sizeof(struct icmpv6_neighbor_solicit_s) & 0xff); icmp->proto = IP_PROTO_ICMP6; /* Next header */ icmp->ttl = 255; /* Hop limit */ /* Set the multicast destination IP address */ memcpy(icmp->destipaddr, g_icmpv_mcastaddr, 6*sizeof(uint16_t)); icmp->destipaddr[6] = ipaddr[6] | HTONS(0xff00); icmp->destipaddr[7] = ipaddr[7]; /* Add out IPv6 address as the source address */ net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr); /* Set up the ICMPv6 Neighbor Solicitation message */ sol = ICMPv6SOLICIT; sol->type = ICMPv6_NEIGHBOR_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; /* Copy the target address into the Neighbor Solicitation message */ net_ipv6addr_copy(sol->tgtaddr, ipaddr); /* 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, IFHWADDRLEN); /* 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_neighbor_solicit_s); #ifdef CONFIG_NET_ETHERNET #ifdef CONFIG_NET_MULTILINK if (dev->d_lltype == NET_LL_ETHERNET) #endif { /* Set the destination IPv6 multicast Ethernet address: * * For IPv6 multicast addresses, the Ethernet MAC is derived by * the four low-order octets OR'ed with the MAC 33:33:00:00:00:00, * so for example the IPv6 address FF02:DEAD:BEEF::1:3 would map * to the Ethernet MAC address 33:33:00:01:00:03. * * NOTES: This appears correct for the ICMPv6 Router Solicitation * Message, but the ICMPv6 Neighbor Solicitation message seems to * use 33:33:ff:01:00:03. */ eth = ETHBUF; eth->dest[0] = 0x33; eth->dest[1] = 0x33; eth->dest[2] = 0xff; eth->dest[3] = ipaddr[6] >> 8; eth->dest[4] = ipaddr[7] & 0xff; eth->dest[5] = ipaddr[7] >> 8; /* 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. */ #if defined(CONFIG_NET_MULTILINK) dev->d_len += dev->d_llhdrlen; #elif defined(CONFIG_NET_ETHERNET) dev->d_len += ETH_HDRLEN; #else /* if defined(CONFIG_NET_SLIP) */ /* SLIP has no link layer header */ #endif nllvdbg("Outgoing ICMPv6 Neighbor 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.ip.sent++; #endif } #endif /* CONFIG_NET_ICMPv6 */