mirror of
https://github.com/lwip-tcpip/lwip.git
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345 lines
10 KiB
C
345 lines
10 KiB
C
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/*
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* Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
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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: Adam Dunkels <adam@sics.se>
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*
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*/
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/*
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* This file is a skeleton for developing Ethernet network interface
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* drivers for lwIP. Add code to the low_level functions and do a
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* search-and-replace for the word "ethernetif" to replace it with
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* something that better describes your network interface.
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*/
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#include "lwip/debug.h"
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/pbuf.h"
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#include "lwip/sys.h"
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#include "netif/arp.h"
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/* Define those to better describe your network interface. */
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#define IFNAME0 'e'
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#define IFNAME1 't'
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struct ethernetif {
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struct eth_addr *ethaddr;
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/* Add whatever per-interface state that is needed here. */
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};
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static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
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/* Forward declarations. */
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static void ethernetif_input(struct netif *netif);
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static err_t ethernetif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr);
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/*-----------------------------------------------------------------------------------*/
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static void
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low_level_init(struct netif *netif)
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{
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struct ethernetif *ethernetif;
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ethernetif = netif->state;
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/* Obtain MAC address from network interface. */
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ethernetif->ethaddr->addr[0] = ;
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ethernetif->ethaddr->addr[1] = ;
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ethernetif->ethaddr->addr[2] = ;
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/* Do whatever else is needed to initialize interface. */
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* low_level_output():
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*
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* Should do the actual transmission of the packet. The packet is
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* contained in the pbuf that is passed to the function. This pbuf
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* might be chained.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static err_t
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low_level_output(struct ethernetif *ethernetif, struct pbuf *p)
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{
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struct pbuf *q;
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initiate transfer();
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for(q = p; q != NULL; q = q->next) {
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/* Send the data from the pbuf to the interface, one pbuf at a
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time. The size of the data in each pbuf is kept in the ->len
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variable. */
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send data from(q->payload, q->len);
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}
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signal that packet should be sent();
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#ifdef LINK_STATS
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stats.link.xmit++;
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#endif /* LINK_STATS */
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return ERR_OK;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* low_level_input():
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*
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* Should allocate a pbuf and transfer the bytes of the incoming
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* packet from the interface into the pbuf.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static struct pbuf *
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low_level_input(struct ethernetif *ethernetif)
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{
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struct pbuf *p, *q;
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u16_t len;
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/* Obtain the size of the packet and put it into the "len"
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variable. */
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len = ;
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/* We allocate a pbuf chain of pbufs from the pool. */
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p = pbuf_alloc(PBUF_LINK, len, PBUF_POOL);
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if(p != NULL) {
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/* We iterate over the pbuf chain until we have read the entire
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packet into the pbuf. */
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for(q = p; q != NULL; q = q->next) {
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/* Read enough bytes to fill this pbuf in the chain. The
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avaliable data in the pbuf is given by the q->len
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variable. */
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read data into(q->payload, q->len);
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}
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acknowledge that packet has been read();
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#ifdef LINK_STATS
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stats.link.recv++;
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#endif /* LINK_STATS */
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} else {
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drop packet();
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#ifdef LINK_STATS
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stats.link.memerr++;
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stats.link.drop++;
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#endif /* LINK_STATS */
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}
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return p;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* ethernetif_output():
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*
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* This function is called by the TCP/IP stack when an IP packet
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* should be sent. It calls the function called low_level_output() to
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* do the actuall transmission of the packet.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static err_t
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ethernetif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr)
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{
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struct ethernetif *ethernetif;
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struct pbuf *q;
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struct eth_hdr *ethhdr;
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struct eth_addr *dest, mcastaddr;
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struct ip_addr *queryaddr;
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err_t err;
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u8_t i;
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ethernetif = netif->state;
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/* Make room for Ethernet header. */
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if(pbuf_header(p, 14) != 0) {
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/* The pbuf_header() call shouldn't fail, but we allocate an extra
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pbuf just in case. */
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q = pbuf_alloc(PBUF_LINK, 14, PBUF_RAM);
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if(q == NULL) {
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#ifdef LINK_STATS
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stats.link.drop++;
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stats.link.memerr++;
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#endif /* LINK_STATS */
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return ERR_MEM;
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}
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pbuf_chain(q, p);
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p = q;
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}
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/* Construct Ethernet header. Start with looking up deciding which
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MAC address to use as a destination address. Broadcasts and
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multicasts are special, all other addresses are looked up in the
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ARP table. */
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queryaddr = ipaddr;
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if(ip_addr_isany(ipaddr) ||
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ip_addr_isbroadcast(ipaddr, &(netif->netmask))) {
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dest = (struct eth_addr *)ðbroadcast;
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} else if(ip_addr_ismulticast(ipaddr)) {
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/* Hash IP multicast address to MAC address. */
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mcastaddr.addr[0] = 0x01;
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mcastaddr.addr[1] = 0x0;
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mcastaddr.addr[2] = 0x5e;
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mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
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mcastaddr.addr[4] = ip4_addr3(ipaddr);
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mcastaddr.addr[5] = ip4_addr4(ipaddr);
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dest = &mcastaddr;
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} else {
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if(ip_addr_maskcmp(ipaddr, &(netif->ip_addr), &(netif->netmask))) {
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/* Use destination IP address if the destination is on the same
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subnet as we are. */
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queryaddr = ipaddr;
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} else {
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/* Otherwise we use the default router as the address to send
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the Ethernet frame to. */
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queryaddr = &(netif->gw);
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}
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dest = arp_lookup(queryaddr);
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}
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/* If the arp_lookup() didn't find an address, we send out an ARP
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query for the IP address. */
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if(dest == NULL) {
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q = arp_query(netif, ethernetif->ethaddr, queryaddr);
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if(q != NULL) {
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err = low_level_output(ethernetif, q);
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pbuf_free(q);
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return err;
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}
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#ifdef LINK_STATS
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stats.link.drop++;
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stats.link.memerr++;
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#endif /* LINK_STATS */
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return ERR_MEM;
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}
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ethhdr = p->payload;
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for(i = 0; i < 6; i++) {
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ethhdr->dest.addr[i] = dest->addr[i];
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ethhdr->src.addr[i] = ethernetif->ethaddr->addr[i];
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}
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ethhdr->type = htons(ETHTYPE_IP);
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return low_level_output(ethernetif, p);
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* ethernetif_input():
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*
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* This function should be called when a packet is ready to be read
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* from the interface. It uses the function low_level_input() that
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* should handle the actual reception of bytes from the network
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* interface.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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ethernetif_input(struct netif *netif)
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{
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struct ethernetif *ethernetif;
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struct eth_hdr *ethhdr;
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struct pbuf *p;
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ethernetif = netif->state;
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p = low_level_input(ethernetif);
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if(p != NULL) {
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#ifdef LINK_STATS
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stats.link.recv++;
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#endif /* LINK_STATS */
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ethhdr = p->payload;
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switch(htons(ethhdr->type)) {
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case ETHTYPE_IP:
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arp_ip_input(netif, p);
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pbuf_header(p, -14);
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netif->input(p, netif);
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break;
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case ETHTYPE_ARP:
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p = arp_arp_input(netif, ethernetif->ethaddr, p);
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if(p != NULL) {
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low_level_output(ethernetif, p);
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pbuf_free(p);
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}
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break;
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default:
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pbuf_free(p);
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break;
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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arp_timer(void *arg)
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{
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arp_tmr();
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sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler)arp_timer, NULL);
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* ethernetif_init():
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*
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* Should be called at the beginning of the program to set up the
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* network interface. It calls the function low_level_init() to do the
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* actual setup of the hardware.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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ethernetif_init(struct netif *netif)
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{
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struct ethernetif *ethernetif;
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ethernetif = mem_malloc(sizeof(struct ethernetif));
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netif->state = ethernetif;
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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netif->output = ethernetif_output;
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netif->linkoutput = low_level_output;
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ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
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low_level_init(netif);
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arp_init();
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sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler)arp_timer, NULL);
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}
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/*-----------------------------------------------------------------------------------*/
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