/**************************************************************************** * net/icmpv6/icmpv6_input.c * Handling incoming ICMPv6 input * * 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 #ifdef CONFIG_NET #include #include #include #include #include #include #include #include #include #include "devif/devif.h" #include "utils/utils.h" #include "neighbor/neighbor.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]) #define ICMPv6ADVERTISE \ ((struct icmpv6_neighbor_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN]) /**************************************************************************** * Public Variables ****************************************************************************/ /**************************************************************************** * Private Variables ****************************************************************************/ #ifdef CONFIG_NET_ICMPv6_PING FAR struct devif_callback_s *g_icmpv6_echocallback = NULL; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: icmpv6_input * * Description: * Handle incoming ICMPv6 input * * Parameters: * dev - The device driver structure containing the received ICMPv6 * packet * * Return: * None * * Assumptions: * Called from the interrupt level or with interrupts disabled. * ****************************************************************************/ void icmpv6_input(FAR struct net_driver_s *dev) { FAR struct icmpv6_iphdr_s *icmp = ICMPv6BUF; #ifdef CONFIG_NET_STATISTICS g_netstats.icmpv6.recv++; #endif /* Set a bit in the d_flags to distinguish this from an IPv6 packet */ IFF_SET_IPv6(dev->d_flags); /* If we get a neighbor solicitation for our address we should send * a neighbor advertisement message back. */ if (icmp->type == ICMPv6_NEIGHBOR_SOLICIT) { FAR struct icmpv6_neighbor_solicit_s *sol; FAR struct icmpv6_neighbor_advertise_s *adv; /* If the data matches our address, add the neighbor to the list * of neighbors. * * Missing checks: * optlen = 1 (8 octets)i * Should only update Neighbor Table if [O]verride bit is set in flags */ sol = ICMPv6SOLICIT; if (net_ipv6addr_cmp(sol->tgtaddr, dev->d_ipv6addr)) { if (sol->opttype == ICMPv6_OPT_SRCLLADDR) { /* Save the sender's address in our neighbor list. */ neighbor_add(icmp->srcipaddr, (FAR struct neighbor_addr_s *)sol->srclladdr); } /* We should now send a neighbor advertisement back to where the * neighbor solicitation came from. */ /* Set up the IPv6 header (most is probably already in place) */ 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, icmp->srcipaddr); 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_FLAG_S | ICMPv6_FLAG_O; /* Solicited+Override flags. */ adv->flags[1] = 0; adv->flags[2] = 0; adv->flags[3] = 0; 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); } #endif } else { goto drop; } } else if (icmp->type == ICMPv6_ECHO_REQUEST) { /* ICMPv6 echo (i.e., ping) processing. This is simple, we only * change the ICMPv6 type from ECHO to ECHO_REPLY and update the * ICMPv6 checksum before we return the packet. */ icmp->type = ICMPv6_ECHO_REPLY; net_ipv6addr_copy(icmp->destipaddr, icmp->srcipaddr); net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr); icmp->chksum = 0; icmp->chksum = ~icmpv6_chksum(dev); } /* If an ICMPv6 echo reply is received then there should also be * a thread waiting to received the echo response. */ #ifdef CONFIG_NET_ICMPv6v6_PING else if (icmp->type == ICMPv6_ECHO_REPLY && g_icmpv6_echocallback) { uint16_t flags = ICMPv6_ECHOREPLY; if (g_icmpv6_echocallback) { /* Dispatch the ECHO reply to the waiting thread */ flags = devif_callback_execute(dev, icmp, flags, g_icmpv6_echocallback); } /* If the ECHO reply was not handled, then drop the packet */ if (flags == ICMPv6_ECHOREPLY) { /* The ECHO reply was not handled */ goto drop; } } #endif else { nlldbg("Unknown ICMPv6 cmd: %d\n", icmp->type); goto typeerr; } /* No additional neighbor lookup is required on this packet. */ IFF_SET_NOARP(dev->d_flags); nllvdbg("Outgoing ICMPv6 packet 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 return; typeerr: #ifdef CONFIG_NET_STATISTICS g_netstats.icmpv6.typeerr++; #endif drop: #ifdef CONFIG_NET_STATISTICS g_netstats.icmpv6.drop++; #endif dev->d_len = 0; } #endif /* CONFIG_NET_ICMPv6 */ #endif /* CONFIG_NET */