/**************************************************************************** * net/icmpv6/icmpv6_advertise.c * Send an ICMPv6 Neighbor Advertisement * * Copyright (C) 2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Adapted for NuttX from logic in uIP which also has a BSD-like license: * * Original author Adam Dunkels * 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 #include #include #include #include #include #include #include #include #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 ICMPv6ADVERTISE \ ((struct icmpv6_neighbor_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN]) /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: icmpv6_advertise * * Description: * Send an ICMPv6 Neighbor Advertisement * * Parameters: * dev - The device driver structure containing the outgoing ICMPv6 packet * buffer * * Return: * None * * Assumptions: * The network is locked * ****************************************************************************/ void icmpv6_advertise(FAR struct net_driver_s *dev, const net_ipv6addr_t destipaddr) { FAR struct icmpv6_iphdr_s *icmp = ICMPv6BUF; FAR struct icmpv6_neighbor_advertise_s *adv; /* 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_neighbor_advertise_s) >> 8); icmp->len[1] = (sizeof(struct icmpv6_neighbor_advertise_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, destipaddr); net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr); /* Set up the ICMPv6 Neighbor Advertise response */ adv = ICMPv6ADVERTISE; adv->type = ICMPv6_NEIGHBOR_ADVERTISE; /* Message type */ adv->code = 0; /* Message qualifier */ adv->flags[0] = ICMPv6_NADV_FLAG_S | ICMPv6_NADV_FLAG_O; /* Solicited+Override flags. */ adv->flags[1] = 0; adv->flags[2] = 0; adv->flags[3] = 0; /* Copy the target address into the Neighbor Advertisement message */ net_ipv6addr_copy(adv->tgtaddr, dev->d_ipv6addr); /* Set up the options */ adv->opttype = ICMPv6_OPT_TGTLLADDR; /* Option type */ adv->optlen = 1; /* Option length = 1 octet */ /* Copy our link layer address into the message * REVISIT: What if the link layer is not Ethernet? */ memcpy(adv->tgtlladdr, &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_advertise_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, eth->src, 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); nllvdbg("Outgoing ICMPv6 Neighbor 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 */