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172 lines
5.4 KiB
C
172 lines
5.4 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) 2009, 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.c,v 1.1 2010/04/30 13:43:53 joxe Exp $
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*/
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/**
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* \file
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* ContikiRPL, an implementation of IETF ROLL 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/uip.h"
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#include "net/tcpip.h"
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#include "net/uip-ds6.h"
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#include "net/rpl/rpl.h"
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#include "net/neighbor-info.h"
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#define DEBUG DEBUG_ANNOTATE
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#include "net/uip-debug.h"
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#include <limits.h>
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/************************************************************************/
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#ifndef RPL_CONF_MAX_ROUTE_ENTRIES
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#define RPL_MAX_ROUTE_ENTRIES 10
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#else
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#define RPL_MAX_ROUTE_ENTRIES RPL_CONF_MAX_ROUTE_ENTRIES
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#endif /* !RPL_CONF_MAX_ROUTE_ENTRIES */
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/************************************************************************/
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extern uip_ds6_route_t uip_ds6_routing_table[UIP_DS6_ROUTE_NB];
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void
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rpl_purge_routes(void)
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{
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int i;
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for(i = 0; i < UIP_DS6_ROUTE_NB; i++) {
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if(uip_ds6_routing_table[i].isused) {
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if(uip_ds6_routing_table[i].state.lifetime <= 1) {
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uip_ds6_route_rm(&uip_ds6_routing_table[i]);
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} else {
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uip_ds6_routing_table[i].state.lifetime--;
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}
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}
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}
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}
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/************************************************************************/
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uip_ds6_route_t *
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rpl_add_route(rpl_dag_t *dag, uip_ipaddr_t *prefix, int prefix_len,
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uip_ipaddr_t *next_hop)
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{
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uip_ds6_route_t *rep;
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if((rep = uip_ds6_route_lookup(prefix)) == NULL) {
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if((rep = uip_ds6_route_add(prefix, prefix_len, next_hop, 0)) == NULL) {
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PRINTF("RPL:ds6 No space for more route entries\n");
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return NULL;
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}
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rep->state.dag = dag;
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rep->state.lifetime = DEFAULT_ROUTE_LIFETIME;
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rep->state.learned_from = RPL_ROUTE_FROM_INTERNAL;
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PRINTF("RPL: Added a route to ");
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PRINT6ADDR(prefix);
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PRINTF("/%d via ", prefix_len);
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PRINT6ADDR(next_hop);
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PRINTF("\n");
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}
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return rep;
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}
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/************************************************************************/
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static void
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neighbor_callback(const rimeaddr_t *addr, int known, int etx)
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{
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uip_ipaddr_t ipaddr;
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rpl_dag_t *dag;
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rpl_neighbor_t *parent;
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uip_ds6_route_t *rep;
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uip_ip6addr(&ipaddr, 0xfe80, 0, 0, 0, 0, 0, 0, 0);
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uip_ds6_set_addr_iid(&ipaddr, (uip_lladdr_t *)addr);
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PRINTF("RPL: Neighbor ");
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PRINT6ADDR(&ipaddr);
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PRINTF(" is %sknown. ETX = %d\n", known ? "" : "no longer ", etx);
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dag = rpl_get_dag(RPL_DEFAULT_INSTANCE);
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if(dag == NULL) {
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return;
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}
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parent = rpl_find_neighbor(dag, &ipaddr);
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if(parent == NULL) {
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rep = uip_ds6_route_lookup(&ipaddr);
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if(rep != NULL) {
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if(!known) {
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rep->state.lifetime = DAO_EXPIRATION_TIMEOUT;
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rep->state.saved_lifetime = rep->state.lifetime;
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} else {
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rep->state.lifetime = rep->state.saved_lifetime;
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}
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}
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} else if(!known) {
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PRINTF("RPL: Removing parent ");
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PRINT6ADDR(&parent->addr);
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PRINTF(" because of bad connectivity (ETX %d)\n",etx);
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rpl_remove_neighbor(dag, parent);
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if(RPL_PARENT_COUNT(dag) == 0) {
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rpl_free_dag(dag);
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} else {
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/* Select a new default route. */
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parent = rpl_find_best_parent(dag);
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if(parent != NULL) {
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rpl_set_default_route(dag, &parent->addr);
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}
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}
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} else {
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parent->local_confidence = ~0 - etx;
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PRINTF("RPL: Updating the local confidence value for this neighbor to %d\n",
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parent->local_confidence);
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if(parent != dag->best_parent &&
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dag->of->best_parent(parent, dag->best_parent) == parent) {
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dag->best_parent = parent;
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rpl_set_default_route(dag, &parent->addr);
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}
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}
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}
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/************************************************************************/
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void
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rpl_init(void)
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{
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PRINTF("RPL started\n");
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rpl_reset_periodic_timer();
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neighbor_info_subscribe(neighbor_callback);
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}
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/************************************************************************/
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