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705 lines
20 KiB
C
705 lines
20 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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* $Id: rpl-dag.c,v 1.19 2010/06/06 21:42:50 nvt-se Exp $
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*/
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/**
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* \file
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* Logic for Directed Acyclic Graphs in RPL.
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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 "net/rpl/rpl.h"
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#include "net/uip.h"
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#include "net/uip-nd6.h"
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#include "net/rime/ctimer.h"
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#include "lib/list.h"
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#include "lib/memb.h"
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#include <limits.h>
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#include <string.h>
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#define DEBUG DEBUG_ANNOTATE
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#include "net/uip-debug.h"
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/************************************************************************/
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extern rpl_of_t rpl_of_etx;
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static rpl_of_t *objective_functions[] = {&rpl_of_etx, NULL};
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/************************************************************************/
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#ifndef RPL_CONF_MAX_DAG_ENTRIES
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#define RPL_MAX_DAG_ENTRIES 2
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#else
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#define RPL_MAX_DAG_ENTRIES RPL_CONF_MAX_DAG_ENTRIES
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#endif /* !RPL_CONF_MAX_DAG_ENTRIES */
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#ifndef RPL_CONF_MAX_PARENTS
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#define RPL_MAX_PARENTS 8
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#else
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#define RPL_MAX_PARENTS RPL_CONF_MAX_PARENTS
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#endif /* !RPL_CONF_MAX_PARENTS */
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/************************************************************************/
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/* RPL definitions. */
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#ifndef RPL_CONF_GROUNDED
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#define RPL_GROUNDED 0
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#else
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#define RPL_GROUNDED RPL_CONF_GROUNDED
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#endif /* !RPL_CONF_GROUNDED */
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#ifndef RPL_CONF_DIO_INTERVAL_MIN
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#define RPL_DIO_INTERVAL_MIN DEFAULT_DIO_INTERVAL_MIN
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#else
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#define RPL_DIO_INTERVAL_MIN RPL_CONF_DIO_INTERVAL_MIN
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#endif /* !RPL_CONF_DIO_INTERVAL_MIN */
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#ifndef RPL_CONF_DIO_INTERVAL_DOUBLINGS
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#define RPL_DIO_INTERVAL_DOUBLINGS DEFAULT_DIO_INTERVAL_DOUBLINGS
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#else
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#define RPL_DIO_INTERVAL_DOUBLINGS RPL_CONF_DIO_INTERVAL_DOUBLINGS
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#endif /* !RPL_CONF_DIO_INTERVAL_DOUBLINGS */
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/************************************************************************/
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/* Allocate parents from the same static MEMB chunk to reduce memory waste. */
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MEMB(parent_memb, struct rpl_parent, RPL_MAX_PARENTS);
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static rpl_dag_t dag_table[RPL_MAX_DAG_ENTRIES];
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#define POISON_ROUTES 1
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/************************************************************************/
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static void
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remove_parents(rpl_dag_t *dag, rpl_parent_t *exception, int poison_routes)
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{
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rpl_parent_t *p, *p2;
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PRINTF("RPL: Removing parents %s poisoning routes\n",
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poison_routes == POISON_ROUTES ? "and" : "without");
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for(p = list_head(dag->parents); p != NULL;) {
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if(p != exception) {
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if(poison_routes == POISON_ROUTES) {
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/* Send no-DAOs to old parents. */
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dao_output(p, ZERO_LIFETIME);
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}
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p2 = p->next;
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rpl_remove_parent(dag, p);
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p = p2;
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} else {
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p = p->next;
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}
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}
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}
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/************************************************************************/
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static int
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should_send_dao(rpl_dag_t *dag, rpl_dio_t *dio, rpl_parent_t *p)
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{
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return dio->dst_adv_supported && dio->dst_adv_trigger &&
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dio->dtsn > p->dtsn && p == dag->best_parent;
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}
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/************************************************************************/
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rpl_dag_t *
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rpl_set_root(uip_ipaddr_t *dag_id)
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{
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rpl_dag_t *dag;
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int version;
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version = -1;
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dag = rpl_get_dag(RPL_DEFAULT_OCP);
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if(dag != NULL) {
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PRINTF("RPL: Dropping a joined DAG when setting this node as root");
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version = dag->version;
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rpl_free_dag(dag);
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}
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dag = rpl_alloc_dag();
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if(dag == NULL) {
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PRINTF("RPL: Failed to allocate a DAG\n");
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return NULL;
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}
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dag->joined = 1;
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dag->version = version + 1;
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dag->grounded = RPL_GROUNDED;
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dag->rank = ROOT_RANK;
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dag->of = rpl_find_of(RPL_DEFAULT_OCP);
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dag->best_parent = NULL;
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dag->dtsn = 1; /* Trigger DAOs from the beginning. */
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memcpy(&dag->dag_id, dag_id, sizeof(dag->dag_id));
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dag->dio_intdoubl = DEFAULT_DIO_INTERVAL_DOUBLINGS;
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dag->dio_intmin = DEFAULT_DIO_INTERVAL_MIN;
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dag->dio_redundancy = DEFAULT_DIO_REDUNDANCY;
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dag->max_rankinc = DEFAULT_MAX_RANKINC;
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dag->min_hoprankinc = DEFAULT_MIN_HOPRANKINC;
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PRINTF("RPL: Node set to be a DAG root with DAG ID ");
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PRINT6ADDR(&dag->dag_id);
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PRINTF("\n");
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rpl_reset_dio_timer(dag, 1);
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return dag;
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}
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/************************************************************************/
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int
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rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, int len)
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{
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if(len <= 128) {
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memset(&dag->prefix_info.prefix, 0, 16);
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memcpy(&dag->prefix_info.prefix, prefix, (len + 7) / 8);
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dag->prefix_info.length = len;
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dag->prefix_info.flags = UIP_ND6_RA_FLAG_AUTONOMOUS;
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PRINTF("RPL: Prefix set - will announce this in DIOs\n");
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return 1;
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}
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return 0;
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}
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/************************************************************************/
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int
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rpl_set_default_route(rpl_dag_t *dag, uip_ipaddr_t *from)
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{
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if(dag->def_route != NULL) {
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PRINTF("RPL: Removing default route through ");
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PRINT6ADDR(&dag->def_route->ipaddr);
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PRINTF("\n");
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uip_ds6_defrt_rm(dag->def_route);
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}
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if(from != NULL) {
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PRINTF("RPL: Adding default route through ");
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PRINT6ADDR(from);
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PRINTF("\n");
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if(DEFAULT_ROUTE_LIFETIME == INFINITE_LIFETIME) {
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dag->def_route = uip_ds6_defrt_add(from, 0);
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} else {
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dag->def_route = uip_ds6_defrt_add(from, DEFAULT_ROUTE_LIFETIME);
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}
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if(dag->def_route == NULL) {
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return 0;
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}
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}
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return 1;
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}
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/************************************************************************/
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rpl_dag_t *
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rpl_alloc_dag(void)
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{
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int i;
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for(i = 0; i < RPL_MAX_DAG_ENTRIES; i++) {
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if(dag_table[i].used == 0) {
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memset(&dag_table[i], 0, sizeof(dag_table[0]));
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dag_table[i].parents = &dag_table[i].parent_list;
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list_init(dag_table[i].parents);
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dag_table[i].def_route = NULL;
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return &dag_table[i];
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}
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}
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return NULL;
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}
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/************************************************************************/
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void
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rpl_free_dag(rpl_dag_t *dag)
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{
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PRINTF("RPL: Leaving the DAG ");
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PRINT6ADDR(&dag->dag_id);
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PRINTF("\n");
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/* Remove routes installed by DAOs. */
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rpl_remove_routes(dag);
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/* Remove parents and the default route. */
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remove_parents(dag, NULL, !POISON_ROUTES);
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rpl_set_default_route(dag, NULL);
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ctimer_stop(&dag->dio_timer);
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ctimer_stop(&dag->dao_timer);
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dag->used = 0;
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dag->joined = 0;
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}
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/************************************************************************/
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rpl_parent_t *
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rpl_add_parent(rpl_dag_t *dag, rpl_dio_t *dio, uip_ipaddr_t *addr)
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{
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rpl_parent_t *p;
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p = memb_alloc(&parent_memb);
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if(p == NULL) {
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return NULL;
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}
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memcpy(&p->addr, addr, sizeof(p->addr));
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p->dag = dag;
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p->rank = dio->dag_rank;
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p->local_confidence = 0;
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p->dtsn = 0;
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list_add(dag->parents, p);
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/* Draw a line between the node and its parent in Cooja. */
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ANNOTATE("#L %u 1\n", addr->u8[sizeof(*addr) - 1]);
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return p;
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}
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/************************************************************************/
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rpl_parent_t *
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rpl_find_parent(rpl_dag_t *dag, uip_ipaddr_t *addr)
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{
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rpl_parent_t *p;
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for(p = list_head(dag->parents); p != NULL; p = p->next) {
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if(uip_ipaddr_cmp(&p->addr, addr)) {
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return p;
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}
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}
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return NULL;
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}
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/************************************************************************/
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rpl_parent_t *
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rpl_preferred_parent(rpl_dag_t *dag)
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{
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rpl_parent_t *p;
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rpl_parent_t *best;
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best = NULL;
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for(p = list_head(dag->parents); p != NULL; p = p->next) {
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if(best == NULL) {
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best = p;
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} else {
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best = dag->of->best_parent(best, p);
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}
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}
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if(dag->best_parent != best) {
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dag->best_parent = best; /* Cache the value. */
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rpl_set_default_route(dag, &best->addr);
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}
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return best;
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}
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/************************************************************************/
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int
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rpl_remove_parent(rpl_dag_t *dag, rpl_parent_t *parent)
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{
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uip_ds6_defrt_t *defrt;
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ANNOTATE("#L %u 0\n",
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parent->addr.u8[sizeof(parent->addr) - 1]);
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/* Remove uIPv6 routes that have this parent as the next hop. **/
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uip_ds6_route_rm_by_nexthop(&parent->addr);
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defrt = uip_ds6_defrt_lookup(&parent->addr);
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if(defrt != NULL) {
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PRINTF("RPL: Removing default route ");
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PRINT6ADDR(&parent->addr);
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PRINTF("\n");
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uip_ds6_defrt_rm(defrt);
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dag->def_route = NULL;
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}
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PRINTF("RPL: Removing parent ");
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PRINT6ADDR(&parent->addr);
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PRINTF("\n");
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list_remove(dag->parents, parent);
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memb_free(&parent_memb, parent);
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return 0;
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}
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/************************************************************************/
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rpl_dag_t *
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rpl_get_dag(int instance_id)
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{
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int i;
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for(i = 0; i < RPL_MAX_DAG_ENTRIES; i++) {
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if(dag_table[i].joined && (instance_id == RPL_ANY_INSTANCE ||
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dag_table[i].instance_id == instance_id)) {
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return &dag_table[i];
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}
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}
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return NULL;
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}
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/************************************************************************/
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rpl_of_t *
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rpl_find_of(rpl_ocp_t ocp)
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{
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rpl_of_t *of;
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for(of = objective_functions[0]; of != NULL; of++) {
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if(of->ocp == ocp) {
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return of;
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}
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}
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return NULL;
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}
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/************************************************************************/
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static void
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join_dag(uip_ipaddr_t *from, rpl_dio_t *dio)
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{
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rpl_dag_t *dag;
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rpl_parent_t *p;
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rpl_of_t *of;
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dag = rpl_alloc_dag();
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if(dag == NULL) {
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PRINTF("RPL: Failed to allocate a DAG object!\n");
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return;
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}
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p = rpl_add_parent(dag, dio, from);
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PRINTF("RPL: Adding ");
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PRINT6ADDR(from);
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PRINTF(" as a parent: ");
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if(p == NULL) {
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PRINTF("failed\n");
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return;
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}
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PRINTF("succeeded\n");
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p->local_confidence = 0; /* The lowest confidence for new parents. */
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/* Determine the objective function by using the
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objective code point of the DIO. */
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of = rpl_find_of(dio->ocp);
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if(of == NULL) {
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PRINTF("RPL: DIO for DAG instance %u does not specify a supported OF\n",
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dio->instance_id);
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return;
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}
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/* Autoconfigure an address if this node does not already have an address
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with this prefix. */
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if((dio->prefix_info.flags & UIP_ND6_RA_FLAG_AUTONOMOUS)) {
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uip_ipaddr_t ipaddr;
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/* assume that the prefix ends with zeros! */
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memcpy(&ipaddr, &dio->prefix_info.prefix, 16);
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uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
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if(uip_ds6_addr_lookup(&ipaddr) == NULL) {
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PRINTF("RPL: adding global IP address ");
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PRINT6ADDR(&ipaddr);
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PRINTF("\n");
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uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
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}
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}
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dag->joined = 1;
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dag->used = 1;
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dag->of = of;
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dag->preference = dio->preference;
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dag->grounded = dio->grounded;
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dag->instance_id = dio->instance_id;
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dag->rank = dag->of->increment_rank(dio->dag_rank, p);
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dag->min_rank = dag->rank; /* So far this is the lowest rank we know */
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dag->version = dio->version;
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dag->best_parent = p;
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dag->dio_intdoubl = dio->dag_intdoubl;
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dag->dio_intmin = dio->dag_intmin;
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dag->dio_redundancy = dio->dag_redund;
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dag->max_rankinc = dio->dag_max_rankinc;
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dag->min_hoprankinc = dio->dag_min_hoprankinc;
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memcpy(&dag->dag_id, &dio->dag_id, sizeof(dio->dag_id));
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/* copy prefix information into the dag */
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memcpy(&dag->prefix_info, &dio->prefix_info, sizeof(rpl_prefix_t));
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PRINTF("RPL: Joined DAG with instance ID %u, rank %hu, DAG ID ",
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dio->instance_id, dag->rank);
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PRINT6ADDR(&dag->dag_id);
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PRINTF("\n");
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rpl_reset_dio_timer(dag, 1);
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rpl_set_default_route(dag, from);
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if(should_send_dao(dag, dio, p)) {
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rpl_schedule_dao(dag);
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} else {
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PRINTF("RPL: dst_adv_trigger not set in incoming DIO!\n");
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}
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}
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/************************************************************************/
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static void
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global_repair(uip_ipaddr_t *from, rpl_dag_t *dag, rpl_dio_t *dio)
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{
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rpl_parent_t *p;
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remove_parents(dag, NULL, !POISON_ROUTES);
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dag->version = dio->version;
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dag->dtsn = 0;
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dag->of->reset(dag);
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if((p = rpl_add_parent(dag, dio, from)) == NULL) {
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PRINTF("RPL: Failed to add a parent during the global repair\n");
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dag->rank = INFINITE_RANK;
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} else {
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rpl_set_default_route(dag, from);
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dag->rank = dag->of->increment_rank(dio->dag_rank, p);
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rpl_reset_dio_timer(dag, 1);
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if(should_send_dao(dag, dio, p)) {
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rpl_schedule_dao(dag);
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}
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}
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PRINTF("RPL: Participating in a global repair (version=%u, rank=%hu)\n",
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dag->version, dag->rank);
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}
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/************************************************************************/
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int
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rpl_repair_dag(rpl_dag_t *dag)
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{
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if(dag->rank == ROOT_RANK) {
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dag->version++;
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dag->dtsn = 1;
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rpl_reset_dio_timer(dag, 1);
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return 1;
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}
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return 0;
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}
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/************************************************************************/
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void
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rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
|
|
{
|
|
rpl_dag_t *dag;
|
|
rpl_parent_t *p;
|
|
rpl_parent_t *preferred_parent;
|
|
uint8_t new_rank;
|
|
uint8_t new_parent;
|
|
|
|
dag = rpl_get_dag(dio->instance_id);
|
|
if(dag == NULL) {
|
|
/* Always join the first possible DAG that is not of INF_RANK. */
|
|
if(dio->dag_rank != INFINITE_RANK) {
|
|
join_dag(from, dio);
|
|
} else {
|
|
PRINTF("RPL: Ignoring DIO from node with infinite rank: ");
|
|
PRINT6ADDR(from);
|
|
PRINTF("\n");
|
|
}
|
|
return;
|
|
}
|
|
|
|
if(dag->instance_id != dio->instance_id) {
|
|
/* We avoid joining more than one RPL instance. */
|
|
PRINTF("RPL: Cannot join another RPL instance\n");
|
|
return;
|
|
}
|
|
|
|
if(memcmp(&dag->dag_id, &dio->dag_id, sizeof(dag->dag_id))) {
|
|
PRINTF("RPL: Ignoring DIO for another DAG within our instance\n");
|
|
return;
|
|
}
|
|
|
|
if(dio->version > dag->version) {
|
|
if(dag->rank == ROOT_RANK) {
|
|
PRINTF("RPL: Root received inconsistent DIO version number\n");
|
|
dag->version = dio->version + 1;
|
|
rpl_reset_dio_timer(dag, 1);
|
|
return;
|
|
} else {
|
|
global_repair(from, dag, dio);
|
|
}
|
|
return;
|
|
} else if(dio->version < dag->version) {
|
|
/* Inconsistency detected - someone is still on old version */
|
|
PRINTF("RPL: old version received => inconsistency detected\n");
|
|
rpl_reset_dio_timer(dag, 1);
|
|
return;
|
|
}
|
|
|
|
dag->dtsn = dio->dtsn;
|
|
|
|
/* This DIO pertains to a DAG that we are already part of. */
|
|
p = rpl_find_parent(dag, from);
|
|
if(p != NULL) {
|
|
if(should_send_dao(dag, dio, p)) {
|
|
rpl_schedule_dao(dag);
|
|
}
|
|
p->dtsn = dio->dtsn;
|
|
|
|
if(p->rank > dio->dag_rank) {
|
|
p->rank = dio->dag_rank;
|
|
rpl_reset_dio_timer(dag, 1);
|
|
} else if(p->rank < dio->dag_rank) {
|
|
PRINTF("RPL: Existing parent ");
|
|
PRINT6ADDR(from);
|
|
PRINTF(" got a higher rank (%hu -> %hu)\n",
|
|
p->rank, dio->dag_rank);
|
|
p->rank = dio->dag_rank;
|
|
if(RPL_PARENT_COUNT(dag) > 1) {
|
|
/* Since we have alternative parents, we can simply drop this one. */
|
|
rpl_remove_parent(dag, p);
|
|
p = rpl_preferred_parent(dag);
|
|
if(p != NULL) {
|
|
rpl_set_default_route(dag, &p->addr);
|
|
}
|
|
return;
|
|
} else if(dag->of->increment_rank(dio->dag_rank, p) <= dag->min_rank + dag->max_rankinc) {
|
|
preferred_parent = rpl_preferred_parent(dag);
|
|
if(p == preferred_parent) {
|
|
new_rank = dag->of->increment_rank(dio->dag_rank, p);
|
|
rpl_set_default_route(dag, &p->addr);
|
|
dag->rank = new_rank;
|
|
PRINTF("RPL: New rank is %hu, max is %hu\n",
|
|
dag->rank, dag->min_rank + dag->max_rankinc);
|
|
}
|
|
} else {
|
|
PRINTF("RPL: Cannot find an acceptable preferred parent\n");
|
|
/* do local repair - jump down the DAG */
|
|
remove_parents(dag, NULL, POISON_ROUTES);
|
|
dag->rank = INFINITE_RANK;
|
|
}
|
|
rpl_reset_dio_timer(dag, 1);
|
|
} else {
|
|
/* Assume consistency and increase the DIO counter. */
|
|
PRINTF("RPL: Received a consistent DIO\n");
|
|
dag->dio_counter++;
|
|
}
|
|
}
|
|
|
|
if(dio->dag_rank < dag->rank) {
|
|
/* Message from a node closer to the root, but we might still be out of allowed rank-range */
|
|
if(dag->max_rankinc > 0 && dag->min_rank + dag->max_rankinc <
|
|
dag->of->increment_rank(dio->dag_rank, NULL)) {
|
|
PRINTF("RPL: Could not add parent, resulting rank too high\n");
|
|
return;
|
|
}
|
|
new_parent = 0;
|
|
if(p == NULL) {
|
|
p = rpl_add_parent(dag, dio, from);
|
|
if(p == NULL) {
|
|
PRINTF("RPL: Could not add parent\n");
|
|
return;
|
|
}
|
|
|
|
PRINTF("RPL: New parent with rank %hu ", p->rank);
|
|
PRINT6ADDR(from);
|
|
PRINTF("\n");
|
|
new_parent = 1;
|
|
}
|
|
|
|
new_rank = dag->of->increment_rank(dio->dag_rank, p);
|
|
if(new_rank < dag->rank) {
|
|
PRINTF("RPL: Moving up within the DAG from rank %hu to %hu\n",
|
|
dag->rank, new_rank);
|
|
dag->rank = new_rank;
|
|
dag->min_rank = new_rank; /* So far this is the lowest rank we know */
|
|
rpl_reset_dio_timer(dag, 1);
|
|
|
|
/* Remove old def-route and add the new */
|
|
/* fix handling of destination prefix */
|
|
rpl_set_default_route(dag, from);
|
|
|
|
if(new_parent) {
|
|
remove_parents(dag, p, POISON_ROUTES);
|
|
}
|
|
}
|
|
} else if(dio->dag_rank == dag->rank) {
|
|
/* Message from a sibling. */
|
|
} else {
|
|
/* Message from a node at a longer distance from the root. If the
|
|
node is in the parent list, we just remove it. */
|
|
if(p != NULL && p->rank < dio->dag_rank) {
|
|
PRINTF("RPL: Parent ");
|
|
PRINT6ADDR(&p->addr);
|
|
PRINTF(" has increased in rank from %hu to %hu. Removing it.\n",
|
|
p->rank, dio->dag_rank);
|
|
rpl_remove_parent(dag, p);
|
|
if(RPL_PARENT_COUNT(dag) == 0) {
|
|
dag->rank = INFINITE_RANK;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/************************************************************************/
|
|
void
|
|
rpl_ds6_neighbor_callback(uip_ds6_nbr_t *nbr)
|
|
{
|
|
if(nbr->isused) {
|
|
PRINTF("RPL: Neighbor state %u: ", nbr->state);
|
|
PRINT6ADDR(&nbr->ipaddr);
|
|
PRINTF("\n");
|
|
} else {
|
|
rpl_dag_t *dag;
|
|
rpl_parent_t *p;
|
|
char acceptable_rank_increase;
|
|
|
|
p = NULL;
|
|
|
|
PRINTF("RPL: Removed neighbor ");
|
|
PRINT6ADDR(&nbr->ipaddr);
|
|
PRINTF("\n");
|
|
|
|
dag = rpl_get_dag(RPL_ANY_INSTANCE);
|
|
if(dag != NULL) {
|
|
p = rpl_find_parent(dag, &nbr->ipaddr);
|
|
if(p != NULL) {
|
|
rpl_remove_parent(dag, p);
|
|
}
|
|
}
|
|
if(dag != NULL && dag->def_route != NULL &&
|
|
uip_ipaddr_cmp(&dag->def_route->ipaddr, &p->addr)) {
|
|
p = rpl_preferred_parent(dag);
|
|
if(p == NULL) {
|
|
rpl_free_dag(dag);
|
|
return;
|
|
}
|
|
|
|
acceptable_rank_increase = !dag->max_rankinc ||
|
|
dag->of->increment_rank(p->rank, p) <= dag->min_rank + dag->max_rankinc;
|
|
if(acceptable_rank_increase) {
|
|
dag->rank = dag->of->increment_rank(p->rank, p);
|
|
if(dag->rank < dag->min_rank) {
|
|
dag->min_rank = dag->rank;
|
|
}
|
|
PRINTF("RPL: New rank is %hu, max is %hu\n",
|
|
dag->rank, dag->min_rank + dag->max_rankinc);
|
|
rpl_set_default_route(dag, &p->addr);
|
|
} else {
|
|
PRINTF("RPL: Cannot select the preferred parent\n");
|
|
/* do local repair - jump down the DAG */
|
|
remove_parents(dag, NULL, POISON_ROUTES);
|
|
dag->rank = INFINITE_RANK;
|
|
rpl_reset_dio_timer(dag, 1);
|
|
}
|
|
}
|
|
}
|
|
}
|