323 lines
8 KiB
C
323 lines
8 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 1.17 2010/02/23 18:44:08 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 "dev/radio.h"
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#include "net/netstack.h"
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#include "net/rime/packetbuf.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 <sys/select.h>
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#include <unistd.h>
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#include "net/ethernode.h"
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#define BUF ((uip_tcpip_hdr *)&uip_buf[HDR_LEN])
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#define PRINTF(...)
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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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static int radio_is_on = 1;
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/*---------------------------------------------------------------------------*/
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static int
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ethernode_on(void)
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{
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radio_is_on = 1;
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ether_set_radio_status(radio_is_on);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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ethernode_safe_off(void)
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{
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radio_is_on = 0;
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ether_set_radio_status(radio_is_on);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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channel_clear(void)
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{
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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receiving(void)
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{
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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pending(void)
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{
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return 0;
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}
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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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PROCESS(ethernode_process, "Ethernode");
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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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PRINTF("ether_send len %d\n", len);
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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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return ether_client_poll();
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}
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/*-------------------------------------------------------------------------------*/
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int
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ethernode_read(void *buf, unsigned short bufsize)
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{
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int len;
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u8_t tmpbuf[2048];
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struct hdr *hdr = (struct hdr *)tmpbuf;
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len = ether_client_read(tmpbuf, sizeof(tmpbuf));
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if(len == 0) {
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return 0;
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}
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if(radio_is_on == 0) {
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/* Drop the incoming packet if the simulated radio is switched off. */
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return 0;
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}
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/* printf("ethernode_poll: received data packet with len %d type %d\n", len, hdr->type);*/
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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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memcpy(buf, tmpbuf + HDR_LEN, bufsize);
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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[2048];
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struct hdr *hdr = (struct hdr *)tmpbuf;
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u8_t dest;
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struct timeval tv;
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if(uip_len > sizeof(tmpbuf)) {
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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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tv.tv_sec = 0;
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tv.tv_usec = (random_rand() % 1000);
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select(0, NULL, NULL, NULL, &tv);
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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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static char tmpbuf[2048];
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static struct hdr *hdr = (struct hdr *)tmpbuf;
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static u8_t dest;
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static int
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prepare(const void *buf, unsigned short len)
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{
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memcpy(&tmpbuf[HDR_LEN], buf, len);
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len = len + HDR_LEN;
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dest = ID_BROADCAST;
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return len;
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}
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/*-------------------------------------------------------------------------------*/
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static int
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transmit(unsigned short len)
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{
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do_send(TYPE_DATA, dest, hdr, len + HDR_LEN);
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return RADIO_TX_OK;
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}
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/*-------------------------------------------------------------------------------*/
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static int
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send(const void *payload, unsigned short payload_len)
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{
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prepare(payload, payload_len);
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return transmit(payload_len);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(ethernode_process, ev, data)
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{
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int len;
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PROCESS_BEGIN();
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while(1) {
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process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL);
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PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE);
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len = ethernode_poll();
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if(len > 0) {
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packetbuf_clear();
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len = ethernode_read(packetbuf_dataptr(), PACKETBUF_SIZE);
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if(len > 0) {
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packetbuf_set_datalen(len);
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NETSTACK_RDC.input();
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}
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/* if(receiver_callback) {
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receiver_callback(ðernode_driver);
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}*/
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}
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}
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PROCESS_END();
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}
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/*-------------------------------------------------------------------------------*/
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const struct radio_driver ethernode_driver =
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{
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(int (*)(void))ethernode_init,
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prepare,
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transmit,
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send,
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ethernode_read,
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channel_clear,
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receiving,
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pending,
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ethernode_on,
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ethernode_safe_off,
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};
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