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412facb831
architecture for the Rime stack for Contiki. The Chameleon architecture separates the header processing from the Rime protocol logic. Instead of having each protocol create its own part of the packet header, protocols use packet attributes. Before sending a packet, a special Chameleon header processing module creates a packet header from the packet attributes. The same Chameleon module parses incoming packets and creates packet attributes from the header. The details are in our SenSys 2007 paper: Adam Dunkels, Fredrik Osterlind, Zhitao He. An Adaptive Communication Architecture for Wireless Sensor Networks. In Proceedings of the Fifth ACM Conference on Networked Embedded Sensor Systems (SenSys 2007), Sydney, Australia, November 2007. http://www.sics.se/~adam/dunkels07adaptive.pdf This is a rewrite of the code that was developed for the paper.
244 lines
7.6 KiB
C
244 lines
7.6 KiB
C
/**
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* \addtogroup rudolph0
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* @{
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*/
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/*
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* Copyright (c) 2007, 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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* $Id: rudolph0.c,v 1.9 2008/02/25 02:14:35 adamdunkels Exp $
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*/
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/**
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* \file
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* Rudolph0: a simple block data flooding protocol
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <stddef.h> /* for offsetof */
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#include "net/rime.h"
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#include "net/rime/rudolph0.h"
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#define STEADY_TIME CLOCK_SECOND * 2
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#define DEFAULT_SEND_INTERVAL CLOCK_SECOND / 2
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enum {
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TYPE_DATA,
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TYPE_NACK,
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};
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enum {
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STATE_RECEIVER,
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STATE_SENDER,
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};
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#define VERSION_LT(a, b) ((signed char)((a) - (b)) < 0)
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static void
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read_new_datapacket(struct rudolph0_conn *c)
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{
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int len = 0;
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if(c->cb->read_chunk) {
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len = c->cb->read_chunk(c, c->current.h.chunk * RUDOLPH0_DATASIZE,
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c->current.data, RUDOLPH0_DATASIZE);
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}
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c->current.datalen = len;
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PRINTF("read_new_datapacket len %d\n", len);
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_nack(struct rudolph0_conn *c)
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{
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struct rudolph0_hdr *hdr;
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rimebuf_clear();
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rimebuf_hdralloc(sizeof(struct rudolph0_hdr));
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hdr = rimebuf_hdrptr();
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hdr->type = TYPE_NACK;
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hdr->version = c->current.h.version;
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hdr->chunk = c->current.h.chunk;
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PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
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polite_send(&c->nackc, c->send_interval / 2, sizeof(struct rudolph0_hdr));
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}
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/*---------------------------------------------------------------------------*/
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static void
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sent(struct sabc_conn *sabc)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
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if(c->current.datalen == RUDOLPH0_DATASIZE) {
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c->current.h.chunk++;
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PRINTF("Sending data chunk %d next time\n", c->current.h.chunk);
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read_new_datapacket(c);
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} else {
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sabc_set_timer(&c->c, STEADY_TIME);
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PRINTF("Steady: Sending the same data chunk next time datalen %d, %d\n",
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c->current.datalen, RUDOLPH0_DATASIZE);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv(struct sabc_conn *sabc)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
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struct rudolph0_datapacket *p = rimebuf_dataptr();
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if(p->h.type == TYPE_DATA) {
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if(c->current.h.version != p->h.version) {
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PRINTF("rudolph0 new version %d\n", p->h.version);
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c->current.h.version = p->h.version;
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c->current.h.chunk = 0;
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c->cb->write_chunk(c, 0, RUDOLPH0_FLAG_NEWFILE, p->data, 0);
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if(p->h.chunk != 0) {
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send_nack(c);
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} else {
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c->cb->write_chunk(c, 0, RUDOLPH0_FLAG_NONE, p->data, p->datalen);
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c->current.h.chunk++;
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}
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} else if(p->h.version == c->current.h.version) {
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if(p->h.chunk == c->current.h.chunk) {
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PRINTF("received chunk %d\n", p->h.chunk);
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if(p->datalen < RUDOLPH0_DATASIZE) {
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c->cb->write_chunk(c, c->current.h.chunk * RUDOLPH0_DATASIZE,
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RUDOLPH0_FLAG_LASTCHUNK, p->data, p->datalen);
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} else {
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c->cb->write_chunk(c, c->current.h.chunk * RUDOLPH0_DATASIZE,
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RUDOLPH0_FLAG_NONE, p->data, p->datalen);
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}
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c->current.h.chunk++;
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} else if(p->h.chunk > c->current.h.chunk) {
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PRINTF("received chunk %d > %d, sending NACK\n", p->h.chunk, c->current.h.chunk);
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send_nack(c);
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}
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} else { /* p->h.version < c->current.h.version */
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/* Ignore packets with old version */
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv_nack(struct polite_conn *polite)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)
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((char *)polite - offsetof(struct rudolph0_conn,
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nackc));
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struct rudolph0_datapacket *p = rimebuf_dataptr();
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if(p->h.type == TYPE_NACK && c->state == STATE_SENDER) {
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if(p->h.version == c->current.h.version) {
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PRINTF("Reseting chunk to %d\n", p->h.chunk);
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c->current.h.chunk = p->h.chunk;
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} else {
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PRINTF("Wrong version, reseting chunk to 0\n");
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c->current.h.chunk = 0;
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}
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read_new_datapacket(c);
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sabc_set_timer(&c->c, c->send_interval);
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct polite_callbacks polite = { recv_nack, 0, 0 };
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static const struct sabc_callbacks sabc = { recv, sent };
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_open(struct rudolph0_conn *c, uint16_t channel,
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const struct rudolph0_callbacks *cb)
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{
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sabc_open(&c->c, channel, &sabc);
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polite_open(&c->nackc, channel + 1, &polite);
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c->cb = cb;
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c->current.h.version = 0;
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c->state = STATE_RECEIVER;
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c->send_interval = DEFAULT_SEND_INTERVAL;
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_close(struct rudolph0_conn *c)
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{
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sabc_close(&c->c);
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polite_close(&c->nackc);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_send(struct rudolph0_conn *c, clock_time_t send_interval)
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{
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c->state = STATE_SENDER;
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c->current.h.version++;
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c->current.h.version++;
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c->current.h.chunk = 0;
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c->current.h.type = TYPE_DATA;
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read_new_datapacket(c);
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rimebuf_reference(&c->current, sizeof(struct rudolph0_datapacket));
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c->send_interval = send_interval;
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sabc_send_stubborn(&c->c, c->send_interval);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_force_restart(struct rudolph0_conn *c)
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{
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c->current.h.chunk = 0;
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send_nack(c);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_stop(struct rudolph0_conn *c)
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{
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sabc_cancel(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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int
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rudolph0_version(struct rudolph0_conn *c)
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{
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return c->current.h.version;
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_set_version(struct rudolph0_conn *c, int version)
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{
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c->current.h.version = version;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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