194 lines
6.3 KiB
C
194 lines
6.3 KiB
C
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/**
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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 <string.h>
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#define ETHTYPE_IPV6 0x86DD
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/** The ethernet address */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct eth_addr {
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PACK_STRUCT_FIELD(u8_t addr[6]);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/** Ethernet header */
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct eth_hdr {
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#if ETH_PAD_SIZE
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PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
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#endif
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PACK_STRUCT_FIELD(struct eth_addr dest);
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PACK_STRUCT_FIELD(struct eth_addr src);
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PACK_STRUCT_FIELD(u16_t type);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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#define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
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/**
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* Send an IPv6 packet on the network using netif->linkoutput
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* The ethernet header is filled in before sending.
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*
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* @params netif the lwIP network interface on which to send the packet
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* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
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* @params src the source MAC address to be copied into the ethernet header
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* @params dst the destination MAC address to be copied into the ethernet header
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* @return ERR_OK if the packet was sent, any other err_t on failure
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*/
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static err_t
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ethip6_send(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
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{
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struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
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LWIP_ASSERT("netif->hwaddr_len must be 6 for ethip6!",
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(netif->hwaddr_len == 6));
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SMEMCPY(ðhdr->dest, dst, 6);
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SMEMCPY(ðhdr->src, src, 6);
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ethhdr->type = PP_HTONS(ETHTYPE_IPV6);
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("ethip6_send: sending packet %p\n", (void *)p));
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/* send the packet */
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return netif->linkoutput(netif, p);
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}
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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, ...
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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_RTE No route to destination (no gateway to external networks),
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* or the return type of either etharp_query() or etharp_send_ip().
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*/
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err_t
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ethip6_output(struct netif *netif, struct pbuf *q, ip6_addr_t *ip6addr)
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{
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struct eth_addr dest;
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s8_t i;
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/* make room for Ethernet header - should not fail */
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if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
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/* bail out */
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
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("etharp_output: could not allocate room for header.\n"));
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return ERR_BUF;
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}
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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] = ((u8_t *)(&(ip6addr->addr[3])))[0];
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dest.addr[3] = ((u8_t *)(&(ip6addr->addr[3])))[1];
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dest.addr[4] = ((u8_t *)(&(ip6addr->addr[3])))[2];
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dest.addr[5] = ((u8_t *)(&(ip6addr->addr[3])))[3];
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/* Send out. */
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return ethip6_send(netif, q, (struct eth_addr*)(netif->hwaddr), &dest);
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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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/* Get next hop record. */
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i = nd6_get_next_hop_entry(ip6addr, netif);
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if (i < 0) {
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/* failed to get a next hop neighbor record. */
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return ERR_MEM;
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}
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/* Now that we have a destination record, send or queue the packet. */
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if (neighbor_cache[i].state == ND6_STALE) {
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/* Switch to delay state. */
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neighbor_cache[i].state = ND6_DELAY;
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neighbor_cache[i].counter.delay_time = LWIP_ND6_DELAY_FIRST_PROBE_TIME;
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}
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/* TODO should we send or queue if PROBE? send for now, to let unicast NS pass. */
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if ((neighbor_cache[i].state == ND6_REACHABLE) ||
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(neighbor_cache[i].state == ND6_DELAY) ||
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(neighbor_cache[i].state == ND6_PROBE)) {
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/* Send out. */
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SMEMCPY(dest.addr, neighbor_cache[i].lladdr, 6);
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return ethip6_send(netif, q, (struct eth_addr*)(netif->hwaddr), &dest);
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}
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/* We should queue packet on this interface. */
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pbuf_header(q, -(s16_t)SIZEOF_ETH_HDR);
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return nd6_queue_packet(i, q);
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}
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#endif /* LWIP_IPV6 && LWIP_ETHERNET */
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