nes-proj/platform/netsim/net/ethernode.c
2008-08-15 19:54:58 +00:00

278 lines
7.1 KiB
C

/*
* 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 1.16 2008/08/15 19:54:58 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 "dev/radio.h"
#include "node.h"
#include "lib/random.h"
#include <stdio.h>
#include <sys/select.h>
#include <unistd.h>
#define BUF ((uip_tcpip_hdr *)&uip_buf[HDR_LEN])
#define PRINTF(...)
/*#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;
};
static int radio_is_on = 1;
static int
ethernode_on(void)
{
radio_is_on = 1;
ether_set_radio_status(radio_is_on);
}
static int
ethernode_safe_off(void)
{
radio_is_on = 0;
ether_set_radio_status(radio_is_on);
}
#include "net/ethernode.h"
const struct radio_driver ethernode_driver =
{
ethernode_send_buf,
ethernode_read,
ethernode_set_receiver,
ethernode_on,
ethernode_safe_off,
};
#define HDR_LEN UIP_LLH_LEN
#define ID_BROADCAST 0x80
PROCESS(ethernode_process, "Ethernode");
/*-------------------------------------------------------------------------------*/
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;
PRINTF("ether_send len %d\n", len);
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)
{
return ether_client_poll();
}
/*-------------------------------------------------------------------------------*/
int
ethernode_read(void *buf, unsigned short bufsize)
{
int len;
u8_t tmpbuf[2048];
struct hdr *hdr = (struct hdr *)tmpbuf;
len = ether_client_read(tmpbuf, sizeof(tmpbuf));
if(len == 0) {
return 0;
}
if(radio_is_on == 0) {
/* Drop the incoming packet if the simulated radio is switched off. */
return 0;
}
/* printf("ethernode_poll: received data packet with len %d type %d\n", len, hdr->type);*/
switch(hdr->type) {
case TYPE_DATA:
if(hdr->dest == state.id ||
hdr->dest == ID_BROADCAST) {
memcpy(buf, tmpbuf + HDR_LEN, bufsize);
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[2048];
struct hdr *hdr = (struct hdr *)tmpbuf;
u8_t dest;
struct timeval tv;
if(uip_len > sizeof(tmpbuf)) {
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;
tv.tv_sec = 0;
tv.tv_usec = (random_rand() % 1000);
select(0, NULL, NULL, NULL, &tv);
do_send(TYPE_DATA, dest, hdr, len);
return UIP_FW_OK;
}
/*-------------------------------------------------------------------------------*/
int
ethernode_send_buf(const void *buf, unsigned short len)
{
char tmpbuf[2048];
struct hdr *hdr = (struct hdr *)tmpbuf;
u8_t dest;
memcpy(&tmpbuf[HDR_LEN], buf, len);
len = len + HDR_LEN;
dest = ID_BROADCAST;
do_send(TYPE_DATA, dest, hdr, len);
return len;
}
/*-------------------------------------------------------------------------------*/
static void (* receiver_callback)(const struct radio_driver *);
/*-------------------------------------------------------------------------------*/
void
ethernode_set_receiver(void (* recv)(const struct radio_driver *))
{
process_start(&ethernode_process, NULL);
receiver_callback = recv;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(ethernode_process, ev, data)
{
PROCESS_BEGIN();
while(1) {
process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL);
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE);
if(ethernode_poll()) {
if(receiver_callback) {
receiver_callback(&ethernode_driver);
}
}
}
PROCESS_END();
}
/*-------------------------------------------------------------------------------*/