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191 lines
5.0 KiB
C
191 lines
5.0 KiB
C
/*
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* Copyright (c) 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
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: ethernode.c,v 1.1 2006/06/17 22:41:36 adamdunkels Exp $
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*/
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/**
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* \file
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* uIP virtual network interface using UDP tunnels.
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* \author Adam Dunkels
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*
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*/
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#include "net/ethernode.h"
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#include "net/uip_arch.h"
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#include "net/uip-fw.h"
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#include "ether.h"
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#include "node.h"
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#include "lib/random.h"
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#include <stdio.h>
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#include <unistd.h>
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#define BUF ((uip_tcpip_hdr *)&uip_buf[HDR_LEN])
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/*#define PRINTF(x)*/
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#define PRINTF(x) printf x; fflush(NULL)
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struct {
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u8_t id;
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int timer;
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u8_t seqno;
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} state;
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#define TYPE_DATA 1
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#define TYPE_ACK 2
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struct hdr {
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u8_t type;
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u8_t src;
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u8_t dest;
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u8_t seqno;
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};
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#define HDR_LEN UIP_LLH_LEN
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#define ID_BROADCAST 0x80
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/*-------------------------------------------------------------------------------*/
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static u8_t
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do_send(u8_t type, u8_t dest, struct hdr *hdr, int len)
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{
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hdr->type = type;
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hdr->src = state.id;
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hdr->dest = dest;
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hdr->seqno = state.seqno;
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++state.seqno;
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return ether_send((char *)hdr, len);
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}
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/*-------------------------------------------------------------------------------*/
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/**
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* Initialize the virtual UDP tunnel network interface.
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*
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* \param sid The ID number of this node.
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*
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*/
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/*-------------------------------------------------------------------------------*/
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void
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ethernode_init(int port)
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{
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ether_client_init(port);
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do {
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state.id = random_rand() & 0x7f;
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} while(state.id == ID_BROADCAST);
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state.seqno = 0;
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}
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/*-------------------------------------------------------------------------------*/
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/**
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* Poll the network device to see if a packet has arrived.
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*
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* \return The length of the incoming packet, or zero if no packet was
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* found.
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*/
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/*-------------------------------------------------------------------------------*/
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int
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ethernode_poll(void)
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{
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int len;
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struct hdr *hdr = (struct hdr *)uip_buf;
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len = ether_client_poll();
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if(len == 0) {
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return 0;
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}
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/* printf("ethernode_poll: received data packet with len %d\n", len);*/
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switch(hdr->type) {
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case TYPE_DATA:
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if(hdr->dest == state.id ||
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hdr->dest == ID_BROADCAST) {
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return len - HDR_LEN;
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}
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break;
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case TYPE_ACK:
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printf("<%d>: Received ack packet from %d\n", state.id, hdr->src);
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break;
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default:
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printf("<%d>: Received unknown packet type %d from %d\n", state.id, hdr->type, hdr->src);
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break;
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}
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return 0;
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}
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/*-------------------------------------------------------------------------------*/
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/**
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* Send a packet from the uip_buf buffer over the UDP tunnel.
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*
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*
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* \retval UIP_FW_TOOLARGE A transmission of packet that was too large was attempted.
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*
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* \retval UIP_FW_DROPPED The packet is known to be dropped.
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*
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* \retval UIP_FW_OK The packet was transmitted.
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*/
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/*-------------------------------------------------------------------------------*/
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u8_t
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ethernode_send(void)
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{
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int len;
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static char tmpbuf[UIP_BUFSIZE + HDR_LEN];
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struct hdr *hdr = (struct hdr *)tmpbuf;
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u8_t dest;
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if(uip_len > UIP_BUFSIZE) {
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PRINTF(("Ethernode_send: too large uip_len %d\n", uip_len));
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return UIP_FW_TOOLARGE;
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}
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memcpy(&tmpbuf[HDR_LEN], &uip_buf[HDR_LEN], uip_len);
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len = uip_len + HDR_LEN;
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dest = ID_BROADCAST;
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usleep(800 * (random_rand() % 1000));
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do_send(TYPE_DATA, dest, hdr, len);
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return UIP_FW_OK;
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}
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/*-------------------------------------------------------------------------------*/
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