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69a7039f75
Previously, ethip6 and lowpan6 each had their own copy of code that used internal nd6 data structures to decide whether to send a packet on the local link right away, or queue it while nd6 performed local address resolution. This patch moves that code into nd6, thereby eliminating all remaining cases of external access to internal nd6 data structures, as well as the need to expose two specific nd6 functions. As a side effect, the patch effectively fixes two bugs in the lowpan6 code that were already fixed in the ethip6 code.
119 lines
4.0 KiB
C
119 lines
4.0 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 nd6_packet_send_check.
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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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/* 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, (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_packet_send_check(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, (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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