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124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/**
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* @file
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*
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* Ethernet output for IPv6. Uses ND tables for link-layer addressing.
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*/
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/*
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* Copyright (c) 2010 Inico Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Ivan Delamer <delamer@inicotech.com>
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*
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*
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* Please coordinate changes and requests with Ivan Delamer
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* <delamer@inicotech.com>
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*/
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#include "lwip/opt.h"
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#if LWIP_IPV6 && LWIP_ETHERNET
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#include "lwip/ethip6.h"
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#include "lwip/nd6.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip6.h"
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#include "lwip/ip6_addr.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/netif.h"
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#include "lwip/icmp6.h"
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#include "lwip/prot/ethernet.h"
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#include "netif/ethernet.h"
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#include <string.h>
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/**
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* Resolve and fill-in Ethernet address header for outgoing IPv6 packet.
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*
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* For IPv6 multicast, corresponding Ethernet addresses
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* are selected and the packet is transmitted on the link.
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*
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* For unicast addresses, ask the ND6 module what to do. It will either let us
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* send the the packet right away, or queue the packet for later itself, unless
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* an error occurs.
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*
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* @todo anycast addresses
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*
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* @param netif The lwIP network interface which the IP packet will be sent on.
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* @param q The pbuf(s) containing the IP packet to be sent.
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* @param ip6addr The IP address of the packet destination.
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*
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* @return
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* - ERR_OK or the return value of @ref nd6_get_next_hop_addr_or_queue.
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*/
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err_t
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ethip6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
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{
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struct eth_addr dest;
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const u8_t *hwaddr;
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err_t result;
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LWIP_ASSERT_CORE_LOCKED();
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/* The destination IP address must be properly zoned from here on down. */
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IP6_ADDR_ZONECHECK_NETIF(ip6addr, netif);
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/* multicast destination IP address? */
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if (ip6_addr_ismulticast(ip6addr)) {
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/* Hash IP multicast address to MAC address.*/
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dest.addr[0] = 0x33;
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dest.addr[1] = 0x33;
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dest.addr[2] = ((const u8_t *)(&(ip6addr->addr[3])))[0];
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dest.addr[3] = ((const u8_t *)(&(ip6addr->addr[3])))[1];
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dest.addr[4] = ((const u8_t *)(&(ip6addr->addr[3])))[2];
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dest.addr[5] = ((const u8_t *)(&(ip6addr->addr[3])))[3];
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/* Send out. */
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return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6);
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}
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/* We have a unicast destination IP address */
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/* @todo anycast? */
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/* Ask ND6 what to do with the packet. */
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result = nd6_get_next_hop_addr_or_queue(netif, q, ip6addr, &hwaddr);
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if (result != ERR_OK) {
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return result;
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}
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/* If no hardware address is returned, nd6 has queued the packet for later. */
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if (hwaddr == NULL) {
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return ERR_OK;
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}
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/* Send out the packet using the returned hardware address. */
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SMEMCPY(dest.addr, hwaddr, 6);
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return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6);
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}
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#endif /* LWIP_IPV6 && LWIP_ETHERNET */
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