226 lines
7 KiB
C
226 lines
7 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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/**
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* \file
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* ContikiRPL, an implementation of RPL: IPv6 Routing Protocol
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* for Low-Power and Lossy Networks (IETF RFC 6550)
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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-private.h"
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#include "net/neighbor-info.h"
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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#include <limits.h>
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#include <string.h>
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#if RPL_CONF_STATS
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rpl_stats_t rpl_stats;
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#endif
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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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/************************************************************************/
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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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void
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rpl_remove_routes(rpl_dag_t *dag)
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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].state.dag == dag) {
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uip_ds6_route_rm(&uip_ds6_routing_table[i]);
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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_remove_routes_by_nexthop(uip_ipaddr_t *nexthop, rpl_dag_t *dag)
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{
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uip_ds6_route_t *locroute;
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for(locroute = uip_ds6_routing_table;
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locroute < uip_ds6_routing_table + UIP_DS6_ROUTE_NB;
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locroute++) {
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if(locroute->isused
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&& uip_ipaddr_cmp(&locroute->nexthop, nexthop)
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&& locroute->state.dag == dag) {
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locroute->isused = 0;
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}
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}
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ANNOTATE("#L %u 0\n",nexthop->u8[sizeof(uip_ipaddr_t) - 1]);
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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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rep = uip_ds6_route_lookup(prefix);
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if(rep == NULL) {
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if((rep = uip_ds6_route_add(prefix, prefix_len, next_hop, 0)) == NULL) {
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PRINTF("RPL: No space for more route entries\n");
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return NULL;
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}
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} else {
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PRINTF("RPL: Updated the next hop for prefix ");
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PRINT6ADDR(prefix);
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PRINTF(" to ");
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PRINT6ADDR(next_hop);
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PRINTF("\n");
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uip_ipaddr_copy(&rep->nexthop, next_hop);
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}
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rep->state.dag = dag;
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rep->state.lifetime = RPL_LIFETIME(dag->instance, dag->instance->default_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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return rep;
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}
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/*---------------------------------------------------------------------------*/
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static void
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rpl_link_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_parent_t *parent;
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rpl_instance_t *instance;
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rpl_instance_t *end;
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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 = %u\n", known ? "" : "no longer ", NEIGHBOR_INFO_FIX2ETX(etx));
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for(instance = &instance_table[0], end = instance + RPL_MAX_INSTANCES; instance < end; ++instance) {
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if(instance->used == 1 ) {
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parent = rpl_find_parent_any_dag(instance, &ipaddr);
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if(parent != NULL) {
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/* Trigger DAG rank recalculation. */
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parent->updated = 1;
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parent->link_metric = etx;
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if(instance->of->parent_state_callback != NULL) {
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instance->of->parent_state_callback(parent, known, etx);
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}
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if(!known) {
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PRINTF("RPL: Removing parent ");
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PRINT6ADDR(&parent->addr);
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PRINTF(" in instance %u because of bad connectivity (ETX %d)\n", instance->instance_id, etx);
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parent->rank = INFINITE_RANK;
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}
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}
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}
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}
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if(!known) {
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PRINTF("RPL: Deleting routes installed by DAOs received from ");
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PRINT6ADDR(&ipaddr);
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PRINTF("\n");
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uip_ds6_route_rm_by_nexthop(&ipaddr);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_ipv6_neighbor_callback(uip_ds6_nbr_t *nbr)
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{
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rpl_parent_t *p;
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rpl_instance_t *instance;
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rpl_instance_t *end;
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if(!nbr->isused) {
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PRINTF("RPL: Removing neighbor ");
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PRINT6ADDR(&nbr->ipaddr);
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PRINTF("\n");
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for(instance = &instance_table[0], end = instance + RPL_MAX_INSTANCES; instance < end; ++instance) {
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if(instance->used == 1 ) {
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p = rpl_find_parent_any_dag(instance, &nbr->ipaddr);
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if(p != NULL) {
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p->rank = INFINITE_RANK;
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/* Trigger DAG rank recalculation. */
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p->updated = 1;
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}
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}
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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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uip_ipaddr_t rplmaddr;
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PRINTF("RPL started\n");
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default_instance = NULL;
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rpl_reset_periodic_timer();
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neighbor_info_subscribe(rpl_link_neighbor_callback);
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/* add rpl multicast address */
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uip_create_linklocal_rplnodes_mcast(&rplmaddr);
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uip_ds6_maddr_add(&rplmaddr);
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#if RPL_CONF_STATS
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memset(&rpl_stats, 0, sizeof(rpl_stats));
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#endif
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}
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/*---------------------------------------------------------------------------*/
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