211 lines
6.2 KiB
C
211 lines
6.2 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 1.16 2009/03/12 21:58:21 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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#include "lib/random.h"
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#if CONTIKI_TARGET_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 DUPLICATE_THRESHOLD 1
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#define SEQNO_LT(a, b) ((signed char)((a) - (b)) < 0)
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static const struct packetbuf_attrlist attributes[] =
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{
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TRICKLE_ATTRIBUTES PACKETBUF_ATTR_LAST
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};
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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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static int run_trickle(struct trickle_conn *c);
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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_packetbuf(c->q);
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broadcast_send(&c->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 void
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timer_callback(void *ptr)
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{
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struct trickle_conn *c = ptr;
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run_trickle(c);
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}
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/*---------------------------------------------------------------------------*/
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static void
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reset_interval(struct trickle_conn *c)
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{
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PT_INIT(&c->pt);
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run_trickle(c);
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_timer(struct trickle_conn *c, struct ctimer *t, clock_time_t i)
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{
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ctimer_set(t, i, timer_callback, c);
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}
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/*---------------------------------------------------------------------------*/
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static int
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run_trickle(struct trickle_conn *c)
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{
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clock_time_t interval;
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PT_BEGIN(&c->pt);
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while(1) {
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interval = c->interval << c->interval_scaling;
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set_timer(c, &c->interval_timer, interval);
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set_timer(c, &c->t, interval / 2 + (random_rand() % (interval / 2)));
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c->duplicates = 0;
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PT_YIELD(&c->pt); /* Wait until listen timeout */
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if(c->duplicates < DUPLICATE_THRESHOLD) {
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send(c);
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}
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PT_YIELD(&c->pt); /* Wait until interval timer expired. */
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if(c->interval_scaling < INTERVAL_MAX) {
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c->interval_scaling++;
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}
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}
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PT_END(&c->pt);
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv(struct broadcast_conn *bc, rimeaddr_t *from)
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{
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struct trickle_conn *c = (struct trickle_conn *)bc;
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uint16_t seqno = packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID);
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PRINTF("%d.%d: trickle recv seqno %d from %d.%d our %d data len %d channel %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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seqno,
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from->u8[0], from->u8[1],
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c->seqno,
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packetbuf_datalen(),
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packetbuf_attr(PACKETBUF_ATTR_CHANNEL));
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if(seqno == c->seqno) {
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/* c->cb->recv(c);*/
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++c->duplicates;
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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 CONTIKI_TARGET_NETSIM
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/* ether_set_line(from->u8[0], from->u8[1]);*/
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#endif /* CONTIKI_TARGET_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_packetbuf();
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c->interval_scaling = 0;
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reset_interval(c);
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send(c);
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c->cb->recv(c);
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}
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}
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/*---------------------------------------------------------------------------*/
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static CC_CONST_FUNCTION struct broadcast_callbacks bc = { recv };
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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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broadcast_open(&c->c, channel, &bc);
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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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c->interval_scaling = 0;
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channel_set_attributes(channel, attributes);
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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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broadcast_close(&c->c);
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ctimer_stop(&c->t);
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ctimer_stop(&c->interval_timer);
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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->seqno++;
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packetbuf_set_attr(PACKETBUF_ATTR_EPACKET_ID, c->seqno);
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c->q = queuebuf_new_from_packetbuf();
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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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reset_interval(c);
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send(c);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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