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.
162 lines
4.8 KiB
C
162 lines
4.8 KiB
C
/**
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* \addtogroup trickle
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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: trickle.c,v 1.8 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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* Trickle (reliable single source flooding) for Rime
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/rime/trickle.h"
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#if NETSIM
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#include "ether.h"
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#endif
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#define INTERVAL_MIN 1
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#define INTERVAL_MAX 4
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#define SEQNO_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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send(void *ptr)
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{
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struct trickle_conn *c = ptr;
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if(c->q != NULL) {
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queuebuf_to_rimebuf(c->q);
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nf_send(&c->c, c->seqno);
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ctimer_set(&c->t, c->interval << c->interval_scaling,
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send, c);
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} else {
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PRINTF("%d.%d: trickle send but c->q == NULL\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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recv(struct nf_conn *nf, rimeaddr_t *from,
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rimeaddr_t *originator, uint8_t seqno, uint8_t hops)
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{
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struct trickle_conn *c = (struct trickle_conn *)nf;
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PRINTF("%d.%d: trickle recv seqno %d our %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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seqno, c->seqno);
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if(seqno == c->seqno) {
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/* c->cb->recv(c);*/
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} else if(SEQNO_LT(seqno, c->seqno)) {
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c->interval_scaling = 0;
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send(c);
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} else { /* hdr->seqno > c->seqno */
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#if NETSIM
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/* ether_set_line(from->u8[0], from->u8[1]);*/
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#endif /* NETSIM */
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c->seqno = seqno;
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/* Store the incoming data in the queuebuf */
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if(c->q != NULL) {
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queuebuf_free(c->q);
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}
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c->q = queuebuf_new_from_rimebuf();
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c->interval_scaling = 0;
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send(c);
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c->cb->recv(c);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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sent_or_dropped(struct nf_conn *nf)
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{
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struct trickle_conn *c = (struct trickle_conn *)nf;
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c->interval_scaling++;
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if(c->interval_scaling > INTERVAL_MAX) {
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c->interval_scaling = INTERVAL_MAX;
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct nf_callbacks nf = {recv,
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sent_or_dropped,
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sent_or_dropped};
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/*---------------------------------------------------------------------------*/
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void
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trickle_open(struct trickle_conn *c, clock_time_t interval,
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uint16_t channel, const struct trickle_callbacks *cb)
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{
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nf_open(&c->c, interval, channel, &nf);
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c->cb = cb;
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c->q = NULL;
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c->interval = interval;
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}
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/*---------------------------------------------------------------------------*/
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void
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trickle_close(struct trickle_conn *c)
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{
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nf_close(&c->c);
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ctimer_stop(&c->t);
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}
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/*---------------------------------------------------------------------------*/
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void
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trickle_send(struct trickle_conn *c)
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{
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if(c->q != NULL) {
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queuebuf_free(c->q);
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}
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c->q = queuebuf_new_from_rimebuf();
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c->seqno++;
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PRINTF("%d.%d: trickle send seqno %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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c->seqno);
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send(c);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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