commit a4a41b9023ef5b3a7c4a1cd82fb167fc63e706df Author: goldsimon <goldsimon@gmx.de> Date: Wed Sep 26 21:50:42 2012 +0200 - This also brings in LwIP's IPv6 codebase Signed-off-by: Tomas Hruby <tom@minix3.org>
193 lines
6.3 KiB
C
193 lines
6.3 KiB
C
/**
|
|
* @file
|
|
*
|
|
* Ethernet output for IPv6. Uses ND tables for link-layer addressing.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2010 Inico Technologies Ltd.
|
|
* 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.
|
|
*
|
|
* This file is part of the lwIP TCP/IP stack.
|
|
*
|
|
* Author: Ivan Delamer <delamer@inicotech.com>
|
|
*
|
|
*
|
|
* Please coordinate changes and requests with Ivan Delamer
|
|
* <delamer@inicotech.com>
|
|
*/
|
|
|
|
#include "lwip/opt.h"
|
|
|
|
#if LWIP_IPV6 && LWIP_ETHERNET
|
|
|
|
#include "lwip/ethip6.h"
|
|
#include "lwip/nd6.h"
|
|
#include "lwip/pbuf.h"
|
|
#include "lwip/ip6.h"
|
|
#include "lwip/ip6_addr.h"
|
|
#include "lwip/inet_chksum.h"
|
|
#include "lwip/netif.h"
|
|
#include "lwip/icmp6.h"
|
|
|
|
#include <string.h>
|
|
|
|
#define ETHTYPE_IPV6 0x86DD
|
|
|
|
/** The ethernet address */
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/bpstruct.h"
|
|
#endif
|
|
PACK_STRUCT_BEGIN
|
|
struct eth_addr {
|
|
PACK_STRUCT_FIELD(u8_t addr[6]);
|
|
} PACK_STRUCT_STRUCT;
|
|
PACK_STRUCT_END
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/epstruct.h"
|
|
#endif
|
|
|
|
/** Ethernet header */
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/bpstruct.h"
|
|
#endif
|
|
PACK_STRUCT_BEGIN
|
|
struct eth_hdr {
|
|
#if ETH_PAD_SIZE
|
|
PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
|
|
#endif
|
|
PACK_STRUCT_FIELD(struct eth_addr dest);
|
|
PACK_STRUCT_FIELD(struct eth_addr src);
|
|
PACK_STRUCT_FIELD(u16_t type);
|
|
} PACK_STRUCT_STRUCT;
|
|
PACK_STRUCT_END
|
|
#ifdef PACK_STRUCT_USE_INCLUDES
|
|
# include "arch/epstruct.h"
|
|
#endif
|
|
|
|
#define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
|
|
|
|
/**
|
|
* Send an IPv6 packet on the network using netif->linkoutput
|
|
* The ethernet header is filled in before sending.
|
|
*
|
|
* @params netif the lwIP network interface on which to send the packet
|
|
* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
|
|
* @params src the source MAC address to be copied into the ethernet header
|
|
* @params dst the destination MAC address to be copied into the ethernet header
|
|
* @return ERR_OK if the packet was sent, any other err_t on failure
|
|
*/
|
|
static err_t
|
|
ethip6_send(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
|
|
{
|
|
struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
|
|
|
|
LWIP_ASSERT("netif->hwaddr_len must be 6 for ethip6!",
|
|
(netif->hwaddr_len == 6));
|
|
SMEMCPY(ðhdr->dest, dst, 6);
|
|
SMEMCPY(ðhdr->src, src, 6);
|
|
ethhdr->type = PP_HTONS(ETHTYPE_IPV6);
|
|
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("ethip6_send: sending packet %p\n", (void *)p));
|
|
/* send the packet */
|
|
return netif->linkoutput(netif, p);
|
|
}
|
|
|
|
/**
|
|
* Resolve and fill-in Ethernet address header for outgoing IPv6 packet.
|
|
*
|
|
* For IPv6 multicast, corresponding Ethernet addresses
|
|
* are selected and the packet is transmitted on the link.
|
|
*
|
|
* For unicast addresses, ...
|
|
*
|
|
* @TODO anycast addresses
|
|
*
|
|
* @param netif The lwIP network interface which the IP packet will be sent on.
|
|
* @param q The pbuf(s) containing the IP packet to be sent.
|
|
* @param ip6addr The IP address of the packet destination.
|
|
*
|
|
* @return
|
|
* - ERR_RTE No route to destination (no gateway to external networks),
|
|
* or the return type of either etharp_query() or etharp_send_ip().
|
|
*/
|
|
err_t
|
|
ethip6_output(struct netif *netif, struct pbuf *q, ip6_addr_t *ip6addr)
|
|
{
|
|
struct eth_addr dest;
|
|
s8_t i;
|
|
|
|
/* make room for Ethernet header - should not fail */
|
|
if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
|
|
/* bail out */
|
|
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
|
|
("etharp_output: could not allocate room for header.\n"));
|
|
return ERR_BUF;
|
|
}
|
|
|
|
/* multicast destination IP address? */
|
|
if (ip6_addr_ismulticast(ip6addr)) {
|
|
/* Hash IP multicast address to MAC address.*/
|
|
dest.addr[0] = 0x33;
|
|
dest.addr[1] = 0x33;
|
|
dest.addr[2] = ((u8_t *)(&(ip6addr->addr[3])))[0];
|
|
dest.addr[3] = ((u8_t *)(&(ip6addr->addr[3])))[1];
|
|
dest.addr[4] = ((u8_t *)(&(ip6addr->addr[3])))[2];
|
|
dest.addr[5] = ((u8_t *)(&(ip6addr->addr[3])))[3];
|
|
|
|
/* Send out. */
|
|
return ethip6_send(netif, q, (struct eth_addr*)(netif->hwaddr), &dest);
|
|
}
|
|
|
|
/* We have a unicast destination IP address */
|
|
/* TODO anycast? */
|
|
/* Get next hop record. */
|
|
i = nd6_get_next_hop_entry(ip6addr, netif);
|
|
if (i < 0) {
|
|
/* failed to get a next hop neighbor record. */
|
|
return ERR_MEM;
|
|
}
|
|
|
|
/* Now that we have a destination record, send or queue the packet. */
|
|
if (neighbor_cache[i].state == ND6_STALE) {
|
|
/* Switch to delay state. */
|
|
neighbor_cache[i].state = ND6_DELAY;
|
|
neighbor_cache[i].counter.delay_time = LWIP_ND6_DELAY_FIRST_PROBE_TIME;
|
|
}
|
|
/* TODO should we send or queue if PROBE? send for now, to let unicast NS pass. */
|
|
if ((neighbor_cache[i].state == ND6_REACHABLE) ||
|
|
(neighbor_cache[i].state == ND6_DELAY) ||
|
|
(neighbor_cache[i].state == ND6_PROBE)) {
|
|
|
|
/* Send out. */
|
|
SMEMCPY(dest.addr, neighbor_cache[i].lladdr, 6);
|
|
return ethip6_send(netif, q, (struct eth_addr*)(netif->hwaddr), &dest);
|
|
}
|
|
|
|
/* We should queue packet on this interface. */
|
|
pbuf_header(q, -(s16_t)SIZEOF_ETH_HDR);
|
|
return nd6_queue_packet(i, q);
|
|
}
|
|
|
|
#endif /* LWIP_IPV6 && LWIP_ETHERNET */
|