327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/*
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* Copyright (c) 2001-2004 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/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 <lwip/stats.h>
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#include "netif/etharp.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 'n'
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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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static void
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low_level_init(struct netif *netif)
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{
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struct ethernetif *ethernetif = netif->state;
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/* set MAC hardware address length */
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netif->hwaddr_len = 6;
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/* set MAC hardware address */
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netif->hwaddr[0] = ;
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...
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netif->hwaddr[5] = ;
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/* maximum transfer unit */
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netif->mtu = 1500;
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/* broadcast capability */
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netif->flags = NETIF_FLAG_BROADCAST;
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/* Do whatever else is needed to initialize interface. */
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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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static err_t
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low_level_output(struct netif *netif, struct pbuf *p)
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{
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struct ethernetif *ethernetif = netif->state;
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struct pbuf *q;
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initiate transfer();
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#if ETH_PAD_SIZE
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pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
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#endif
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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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#if ETH_PAD_SIZE
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pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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#endif
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#if LINK_STATS
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lwip_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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* 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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static struct pbuf *
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low_level_input(struct netif *netif)
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{
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struct ethernetif *ethernetif = netif->state;
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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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#if ETH_PAD_SIZE
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len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
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#endif
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/* We allocate a pbuf chain of pbufs from the pool. */
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p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
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if (p != NULL) {
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#if ETH_PAD_SIZE
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pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
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#endif
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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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* available 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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#if ETH_PAD_SIZE
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pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
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#endif
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#if LINK_STATS
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lwip_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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#if LINK_STATS
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lwip_stats.link.memerr++;
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lwip_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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* 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 actual transmission of the packet.
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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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/* resolve hardware address, then send (or queue) packet */
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return etharp_output(netif, ipaddr, p);
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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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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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/* move received packet into a new pbuf */
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p = low_level_input(netif);
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/* no packet could be read, silently ignore this */
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if (p == NULL) return;
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/* points to packet payload, which starts with an Ethernet header */
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ethhdr = p->payload;
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#if LINK_STATS
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lwip_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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/* IP packet? */
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case ETHTYPE_IP:
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#if 0
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/* CSi disabled ARP table update on ingress IP packets.
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This seems to work but needs thorough testing. */
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/* update ARP table */
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etharp_ip_input(netif, p);
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#endif
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/* skip Ethernet header */
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pbuf_header(p, -sizeof(struct eth_hdr));
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/* pass to network layer */
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netif->input(p, netif);
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break;
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case ETHTYPE_ARP:
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/* pass p to ARP module */
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etharp_arp_input(netif, ethernetif->ethaddr, p);
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break;
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default:
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pbuf_free(p);
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p = NULL;
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break;
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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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etharp_tmr();
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sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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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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err_t
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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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if (ethernetif == NULL)
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{
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LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
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return ERR_MEM;
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}
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#if LWIP_SNMP
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/* ifType ethernetCsmacd(6) @see RFC1213 */
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netif->link_type = 6;
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/* your link speed here */
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netif->link_speed = ;
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netif->ts = 0;
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netif->ifinoctets = 0;
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netif->ifinucastpkts = 0;
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netif->ifinnucastpkts = 0;
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netif->ifindiscards = 0;
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netif->ifoutoctets = 0;
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netif->ifoutucastpkts = 0;
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netif->ifoutnucastpkts = 0;
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netif->ifoutdiscards = 0;
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#endif
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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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etharp_init();
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sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
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return ERR_OK;
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}
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