nes-proj/platform/netsim/net/ethernode.c

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/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: ethernode.c,v 1.1 2006/06/17 22:41:36 adamdunkels Exp $
*/
/**
* \file
* uIP virtual network interface using UDP tunnels.
* \author Adam Dunkels
*
*/
#include "net/ethernode.h"
#include "net/uip_arch.h"
#include "net/uip-fw.h"
#include "ether.h"
#include "node.h"
#include "lib/random.h"
#include <stdio.h>
#include <unistd.h>
#define BUF ((uip_tcpip_hdr *)&uip_buf[HDR_LEN])
/*#define PRINTF(x)*/
#define PRINTF(x) printf x; fflush(NULL)
struct {
u8_t id;
int timer;
u8_t seqno;
} state;
#define TYPE_DATA 1
#define TYPE_ACK 2
struct hdr {
u8_t type;
u8_t src;
u8_t dest;
u8_t seqno;
};
#define HDR_LEN UIP_LLH_LEN
#define ID_BROADCAST 0x80
/*-------------------------------------------------------------------------------*/
static u8_t
do_send(u8_t type, u8_t dest, struct hdr *hdr, int len)
{
hdr->type = type;
hdr->src = state.id;
hdr->dest = dest;
hdr->seqno = state.seqno;
++state.seqno;
return ether_send((char *)hdr, len);
}
/*-------------------------------------------------------------------------------*/
/**
* Initialize the virtual UDP tunnel network interface.
*
* \param sid The ID number of this node.
*
*/
/*-------------------------------------------------------------------------------*/
void
ethernode_init(int port)
{
ether_client_init(port);
do {
state.id = random_rand() & 0x7f;
} while(state.id == ID_BROADCAST);
state.seqno = 0;
}
/*-------------------------------------------------------------------------------*/
/**
* Poll the network device to see if a packet has arrived.
*
* \return The length of the incoming packet, or zero if no packet was
* found.
*/
/*-------------------------------------------------------------------------------*/
int
ethernode_poll(void)
{
int len;
struct hdr *hdr = (struct hdr *)uip_buf;
len = ether_client_poll();
if(len == 0) {
return 0;
}
/* printf("ethernode_poll: received data packet with len %d\n", len);*/
switch(hdr->type) {
case TYPE_DATA:
if(hdr->dest == state.id ||
hdr->dest == ID_BROADCAST) {
return len - HDR_LEN;
}
break;
case TYPE_ACK:
printf("<%d>: Received ack packet from %d\n", state.id, hdr->src);
break;
default:
printf("<%d>: Received unknown packet type %d from %d\n", state.id, hdr->type, hdr->src);
break;
}
return 0;
}
/*-------------------------------------------------------------------------------*/
/**
* Send a packet from the uip_buf buffer over the UDP tunnel.
*
*
* \retval UIP_FW_TOOLARGE A transmission of packet that was too large was attempted.
*
* \retval UIP_FW_DROPPED The packet is known to be dropped.
*
* \retval UIP_FW_OK The packet was transmitted.
*/
/*-------------------------------------------------------------------------------*/
u8_t
ethernode_send(void)
{
int len;
static char tmpbuf[UIP_BUFSIZE + HDR_LEN];
struct hdr *hdr = (struct hdr *)tmpbuf;
u8_t dest;
if(uip_len > UIP_BUFSIZE) {
PRINTF(("Ethernode_send: too large uip_len %d\n", uip_len));
return UIP_FW_TOOLARGE;
}
memcpy(&tmpbuf[HDR_LEN], &uip_buf[HDR_LEN], uip_len);
len = uip_len + HDR_LEN;
dest = ID_BROADCAST;
usleep(800 * (random_rand() % 1000));
do_send(TYPE_DATA, dest, hdr, len);
return UIP_FW_OK;
}
/*-------------------------------------------------------------------------------*/