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faff1c2a7e
* Mesh: this is the normal case. Nodes route data on behalf of others and the node can be reached via a DAO route. * Leaf: the node does not route data on behalf of others, but others can route data to the node (it has a RPL DAO route). * Feather: this is a new type of node. A feather node routes data on behalf of others, but does not install DAO routes in the network. Feather nodes allow having a larger number of nodes than the RPL network can sustain in terms of routing tables. This commit introduces the RPL node types and the feather mode, but does not add support for the leaf node type.
297 lines
9.8 KiB
C
297 lines
9.8 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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#if UIP_CONF_IPV6
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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_instance_t *instance);
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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_any_dag() == 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_instance_t *instance)
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{
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uint32_t time;
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clock_time_t ticks;
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/* TODO: too small timer intervals for many cases */
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time = 1UL << instance->dio_intcurrent;
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/* Convert from milliseconds to CLOCK_TICKS. */
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ticks = (time * CLOCK_SECOND) / 1000;
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instance->dio_next_delay = ticks;
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/* random number between I/2 and I */
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ticks = ticks / 2 + (ticks / 2 * (uint32_t)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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instance->dio_next_delay -= ticks;
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instance->dio_send = 1;
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#if RPL_CONF_STATS
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/* keep some stats */
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instance->dio_totint++;
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instance->dio_totrecv += instance->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(instance->current_dag->rank, instance),
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(10 * (instance->current_dag->rank % instance->min_hoprankinc)) / instance->min_hoprankinc,
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instance->current_dag->version,
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instance->dio_totint, instance->dio_totsend,
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instance->dio_totrecv,instance->dio_intcurrent,
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instance->current_dag->rank == ROOT_RANK(instance) ? "BLUE" : "ORANGE");
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#endif /* RPL_CONF_STATS */
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/* reset the redundancy counter */
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instance->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", ticks);
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ctimer_set(&instance->dio_timer, ticks, &handle_dio_timer, instance);
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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_instance_t *instance;
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instance = (rpl_instance_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(&instance->dio_timer, CLOCK_SECOND, &handle_dio_timer, instance);
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return;
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}
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}
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if(instance->dio_send) {
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/* send DIO if counter is less than desired redundancy */
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if(instance->dio_counter < instance->dio_redundancy) {
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#if RPL_CONF_STATS
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instance->dio_totsend++;
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#endif /* RPL_CONF_STATS */
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dio_output(instance, NULL);
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} else {
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PRINTF("RPL: Supressing DIO transmission (%d >= %d)\n",
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instance->dio_counter, instance->dio_redundancy);
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}
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instance->dio_send = 0;
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PRINTF("RPL: Scheduling DIO timer %lu ticks in future (sent)\n",
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instance->dio_next_delay);
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ctimer_set(&instance->dio_timer, instance->dio_next_delay, handle_dio_timer, instance);
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} else {
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/* check if we need to double interval */
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if(instance->dio_intcurrent < instance->dio_intmin + instance->dio_intdoubl) {
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instance->dio_intcurrent++;
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PRINTF("RPL: DIO Timer interval doubled %d\n", instance->dio_intcurrent);
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}
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new_dio_interval(instance);
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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 / 2 +
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((uint32_t)RPL_DIS_INTERVAL * (uint32_t)random_rand()) / RANDOM_RAND_MAX -
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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 instance to its minimal interval. */
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void
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rpl_reset_dio_timer(rpl_instance_t *instance)
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{
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#if !RPL_LEAF_ONLY
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/* Do not reset if we are already on the minimum interval,
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unless forced to do so. */
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if(instance->dio_intcurrent > instance->dio_intmin) {
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instance->dio_counter = 0;
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instance->dio_intcurrent = instance->dio_intmin;
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new_dio_interval(instance);
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}
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#if RPL_CONF_STATS
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rpl_stats.resets++;
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#endif /* RPL_CONF_STATS */
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#endif /* RPL_LEAF_ONLY */
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}
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/*---------------------------------------------------------------------------*/
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static void handle_dao_timer(void *ptr);
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static void
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set_dao_lifetime_timer(rpl_instance_t *instance)
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{
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if(rpl_get_mode() == RPL_MODE_FEATHER) {
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return;
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}
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/* Set up another DAO within half the expiration time, if such a
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time has been configured */
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if(instance->lifetime_unit != 0xffff && instance->default_lifetime != 0xff) {
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clock_time_t expiration_time;
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expiration_time = (clock_time_t)instance->default_lifetime *
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(clock_time_t)instance->lifetime_unit *
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CLOCK_SECOND / 2;
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PRINTF("RPL: Scheduling DAO lifetime timer %u ticks in the future\n",
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(unsigned)expiration_time);
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ctimer_set(&instance->dao_lifetime_timer, expiration_time,
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handle_dao_timer, instance);
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}
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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_instance_t *instance;
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instance = (rpl_instance_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(&instance->dao_timer, CLOCK_SECOND, handle_dao_timer, instance);
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return;
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}
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/* Send the DAO to the DAO parent set -- the preferred parent in our case. */
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if(instance->current_dag->preferred_parent != NULL) {
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PRINTF("RPL: handle_dao_timer - sending DAO\n");
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/* Set the route lifetime to the default value. */
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dao_output(instance->current_dag->preferred_parent, instance->default_lifetime);
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} else {
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PRINTF("RPL: No suitable DAO parent\n");
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}
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ctimer_stop(&instance->dao_timer);
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if(etimer_expired(&instance->dao_lifetime_timer.etimer)) {
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set_dao_lifetime_timer(instance);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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schedule_dao(rpl_instance_t *instance, clock_time_t latency)
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{
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clock_time_t expiration_time;
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if(rpl_get_mode() == RPL_MODE_FEATHER) {
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return;
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}
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expiration_time = etimer_expiration_time(&instance->dao_timer.etimer);
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if(!etimer_expired(&instance->dao_timer.etimer)) {
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PRINTF("RPL: DAO timer already scheduled\n");
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} else {
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if(latency != 0) {
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expiration_time = latency / 2 +
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(random_rand() % (latency));
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} else {
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expiration_time = 0;
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}
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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(&instance->dao_timer, expiration_time,
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handle_dao_timer, instance);
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set_dao_lifetime_timer(instance);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_schedule_dao(rpl_instance_t *instance)
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{
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schedule_dao(instance, RPL_DAO_LATENCY);
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_schedule_dao_immediately(rpl_instance_t *instance)
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{
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schedule_dao(instance, 0);
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_cancel_dao(rpl_instance_t *instance)
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{
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ctimer_stop(&instance->dao_timer);
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ctimer_stop(&instance->dao_lifetime_timer);
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}
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/*---------------------------------------------------------------------------*/
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#endif /* UIP_CONF_IPV6 */
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