235 lines
7.5 KiB
C
235 lines
7.5 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/*
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* Copyright (c) 2010, 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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/**
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* \file
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* RPL timer management.
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*
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* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
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*/
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#include "contiki-conf.h"
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#include "net/rpl/rpl-private.h"
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#include "lib/random.h"
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#include "sys/ctimer.h"
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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/************************************************************************/
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static struct ctimer periodic_timer;
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static void handle_periodic_timer(void *ptr);
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static void new_dio_interval(rpl_dag_t *dag);
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static void handle_dio_timer(void *ptr);
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static uint16_t next_dis;
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/* dio_send_ok is true if the node is ready to send DIOs */
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static uint8_t dio_send_ok;
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/************************************************************************/
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static void
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handle_periodic_timer(void *ptr)
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{
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rpl_purge_routes();
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rpl_recalculate_ranks();
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/* handle DIS */
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#ifdef RPL_DIS_SEND
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next_dis++;
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if(rpl_get_dag(RPL_ANY_INSTANCE) == NULL && next_dis >= RPL_DIS_INTERVAL) {
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next_dis = 0;
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dis_output(NULL);
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}
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#endif
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ctimer_reset(&periodic_timer);
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}
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/************************************************************************/
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static void
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new_dio_interval(rpl_dag_t *dag)
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{
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uint32_t time;
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/* TODO: too small timer intervals for many cases */
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time = 1UL << dag->dio_intcurrent;
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/* Convert from milliseconds to CLOCK_TICKS. */
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time = (time * CLOCK_SECOND) / 1000;
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dag->dio_next_delay = time;
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/* random number between I/2 and I */
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time = time >> 1;
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time += (time * random_rand()) / RANDOM_RAND_MAX;
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/*
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* The intervals must be equally long among the nodes for Trickle to
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* operate efficiently. Therefore we need to calculate the delay between
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* the randomized time and the start time of the next interval.
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*/
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dag->dio_next_delay -= time;
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dag->dio_send = 1;
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#if RPL_CONF_STATS
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/* keep some stats */
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dag->dio_totint++;
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dag->dio_totrecv += dag->dio_counter;
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ANNOTATE("#A rank=%u.%u(%u),stats=%d %d %d %d,color=%s\n",
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DAG_RANK(dag->rank, dag),
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(10 * (dag->rank % dag->min_hoprankinc)) / dag->min_hoprankinc,
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dag->version,
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dag->dio_totint, dag->dio_totsend,
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dag->dio_totrecv,dag->dio_intcurrent,
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dag->rank == ROOT_RANK(dag) ? "BLUE" : "ORANGE");
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#endif /* RPL_CONF_STATS */
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/* reset the redundancy counter */
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dag->dio_counter = 0;
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/* schedule the timer */
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PRINTF("RPL: Scheduling DIO timer %lu ticks in future (Interval)\n", time);
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ctimer_set(&dag->dio_timer, time, &handle_dio_timer, dag);
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}
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/************************************************************************/
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static void
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handle_dio_timer(void *ptr)
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{
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rpl_dag_t *dag;
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dag = (rpl_dag_t *)ptr;
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PRINTF("RPL: DIO Timer triggered\n");
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if(!dio_send_ok) {
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if(uip_ds6_get_link_local(ADDR_PREFERRED) != NULL) {
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dio_send_ok = 1;
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} else {
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PRINTF("RPL: Postponing DIO transmission since link local address is not ok\n");
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ctimer_set(&dag->dio_timer, CLOCK_SECOND, &handle_dio_timer, dag);
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return;
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}
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}
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if(dag->dio_send) {
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/* send DIO if counter is less than desired redundancy */
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if(dag->dio_counter < dag->dio_redundancy) {
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#if RPL_CONF_STATS
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dag->dio_totsend++;
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#endif /* RPL_CONF_STATS */
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dio_output(dag, NULL);
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} else {
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PRINTF("RPL: Supressing DIO transmission (%d >= %d)\n",
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dag->dio_counter, dag->dio_redundancy);
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}
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dag->dio_send = 0;
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PRINTF("RPL: Scheduling DIO timer %u ticks in future (sent)\n",
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dag->dio_next_delay);
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ctimer_set(&dag->dio_timer, dag->dio_next_delay, handle_dio_timer, dag);
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} else {
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/* check if we need to double interval */
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if(dag->dio_intcurrent < dag->dio_intmin + dag->dio_intdoubl) {
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dag->dio_intcurrent++;
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PRINTF("RPL: DIO Timer interval doubled %d\n", dag->dio_intcurrent);
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}
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new_dio_interval(dag);
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}
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}
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/************************************************************************/
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void
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rpl_reset_periodic_timer(void)
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{
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next_dis = RPL_DIS_INTERVAL - RPL_DIS_START_DELAY;
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ctimer_set(&periodic_timer, CLOCK_SECOND, handle_periodic_timer, NULL);
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}
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/************************************************************************/
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/* Resets the DIO timer in the DAG to its minimal interval. */
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void
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rpl_reset_dio_timer(rpl_dag_t *dag, uint8_t force)
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{
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/* only reset if not just reset or started */
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if(force || dag->dio_intcurrent > dag->dio_intmin) {
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dag->dio_counter = 0;
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dag->dio_intcurrent = dag->dio_intmin;
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new_dio_interval(dag);
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}
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#if RPL_CONF_STATS
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rpl_stats.resets++;
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#endif
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}
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/************************************************************************/
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static void
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handle_dao_timer(void *ptr)
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{
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rpl_dag_t *dag;
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dag = (rpl_dag_t *)ptr;
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if (!dio_send_ok && uip_ds6_get_link_local(ADDR_PREFERRED) == NULL) {
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PRINTF("RPL: Postpone DAO transmission... \n");
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ctimer_set(&dag->dao_timer, CLOCK_SECOND, handle_dao_timer, dag);
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return;
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}
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/* Send the DAO to the best parent. rpl-07 section C.2 lists the
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fan-out as being under investigation. */
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if(dag->preferred_parent != NULL) {
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PRINTF("RPL: handle_dao_timer - sending DAO\n");
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/* set time to maxtime */
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dao_output(dag->preferred_parent, dag->lifetime_unit * 0xffUL);
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} else {
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PRINTF("RPL: Could not find a parent to send a DAO to \n");
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}
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ctimer_stop(&dag->dao_timer);
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}
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/************************************************************************/
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void
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rpl_schedule_dao(rpl_dag_t *dag)
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{
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clock_time_t expiration_time;
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expiration_time = etimer_expiration_time(&dag->dao_timer.etimer);
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if(!etimer_expired(&dag->dao_timer.etimer)) {
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PRINTF("RPL: DAO timer already scheduled\n");
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} else {
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expiration_time = DEFAULT_DAO_LATENCY / 2 +
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(random_rand() % (DEFAULT_DAO_LATENCY));
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PRINTF("RPL: Scheduling DAO timer %u ticks in the future\n",
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(unsigned)expiration_time);
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ctimer_set(&dag->dao_timer, expiration_time,
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handle_dao_timer, dag);
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}
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}
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/************************************************************************/
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