2016-02-01 17:02:33 +00:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2016, Inria.
|
|
|
|
* All rights reserved.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
|
|
* may be used to endorse or promote products derived from this software
|
|
|
|
* without specific prior written permission.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
* SUCH DAMAGE.
|
|
|
|
*
|
|
|
|
* This file is part of the Contiki operating system.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* \file
|
|
|
|
* RPL non-storing mode specific functions. Includes support for
|
|
|
|
* source routing.
|
|
|
|
*
|
|
|
|
* \author Simon Duquennoy <simon.duquennoy@inria.fr>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "net/rpl/rpl-conf.h"
|
|
|
|
|
|
|
|
#include "net/ip/uip.h"
|
|
|
|
#include "net/ip/tcpip.h"
|
|
|
|
#include "net/ipv6/uip-ds6.h"
|
|
|
|
#include "net/ipv6/uip-icmp6.h"
|
|
|
|
#include "net/rpl/rpl-private.h"
|
|
|
|
#include "net/rpl/rpl-ns.h"
|
|
|
|
#include "lib/list.h"
|
|
|
|
#include "lib/memb.h"
|
|
|
|
|
|
|
|
#if RPL_WITH_NON_STORING
|
|
|
|
|
|
|
|
#define DEBUG DEBUG_NONE
|
|
|
|
#include "net/ip/uip-debug.h"
|
|
|
|
|
|
|
|
#include <limits.h>
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
/* Total number of nodes */
|
|
|
|
static int num_nodes;
|
|
|
|
|
|
|
|
/* Every known node in the network */
|
|
|
|
LIST(nodelist);
|
|
|
|
MEMB(nodememb, rpl_ns_node_t, RPL_NS_LINK_NUM);
|
|
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
int
|
2016-06-08 12:05:37 +00:00
|
|
|
rpl_ns_num_nodes(void)
|
2016-02-01 17:02:33 +00:00
|
|
|
{
|
|
|
|
return num_nodes;
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
static int
|
|
|
|
node_matches_address(const rpl_dag_t *dag, const rpl_ns_node_t *node, const uip_ipaddr_t *addr)
|
|
|
|
{
|
|
|
|
return addr != NULL
|
|
|
|
&& node != NULL
|
|
|
|
&& dag != NULL
|
|
|
|
&& dag == node->dag
|
|
|
|
&& !memcmp(addr, &node->dag->dag_id, 8)
|
|
|
|
&& !memcmp(((const unsigned char *)addr) + 8, node->link_identifier, 8);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
rpl_ns_node_t *
|
|
|
|
rpl_ns_get_node(const rpl_dag_t *dag, const uip_ipaddr_t *addr)
|
|
|
|
{
|
|
|
|
rpl_ns_node_t *l;
|
|
|
|
for(l = list_head(nodelist); l != NULL; l = list_item_next(l)) {
|
|
|
|
/* Compare prefix and node identifier */
|
|
|
|
if(node_matches_address(dag, l, addr)) {
|
|
|
|
return l;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
int
|
|
|
|
rpl_ns_is_node_reachable(const rpl_dag_t *dag, const uip_ipaddr_t *addr)
|
|
|
|
{
|
|
|
|
int max_depth = RPL_NS_LINK_NUM;
|
|
|
|
rpl_ns_node_t *node = rpl_ns_get_node(dag, addr);
|
|
|
|
rpl_ns_node_t *root_node = rpl_ns_get_node(dag, dag != NULL ? &dag->dag_id : NULL);
|
|
|
|
while(node != NULL && node != root_node && max_depth > 0) {
|
|
|
|
node = node->parent;
|
|
|
|
max_depth--;
|
|
|
|
}
|
|
|
|
return node != NULL && node == root_node;
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
void
|
|
|
|
rpl_ns_expire_parent(rpl_dag_t *dag, const uip_ipaddr_t *child, const uip_ipaddr_t *parent)
|
|
|
|
{
|
|
|
|
rpl_ns_node_t *l = rpl_ns_get_node(dag, child);
|
|
|
|
/* Check if parent matches */
|
|
|
|
if(l != NULL && node_matches_address(dag, l->parent, parent)) {
|
|
|
|
l->lifetime = RPL_NOPATH_REMOVAL_DELAY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
rpl_ns_node_t *
|
|
|
|
rpl_ns_update_node(rpl_dag_t *dag, const uip_ipaddr_t *child, const uip_ipaddr_t *parent, uint32_t lifetime)
|
|
|
|
{
|
|
|
|
rpl_ns_node_t *child_node = rpl_ns_get_node(dag, child);
|
|
|
|
rpl_ns_node_t *parent_node = rpl_ns_get_node(dag, parent);
|
|
|
|
|
|
|
|
if(parent != NULL) {
|
|
|
|
/* No node for the parent, add one with infinite lifetime */
|
|
|
|
if(parent_node == NULL) {
|
|
|
|
parent_node = rpl_ns_update_node(dag, parent, NULL, 0xffffffff);
|
|
|
|
if(parent_node == NULL) {
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* No node for this child, add one */
|
|
|
|
if(child_node == NULL) {
|
|
|
|
child_node = memb_alloc(&nodememb);
|
|
|
|
/* No space left, abort */
|
|
|
|
if(child_node == NULL) {
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
list_add(nodelist, child_node);
|
|
|
|
num_nodes++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialize node */
|
|
|
|
child_node->dag = dag;
|
|
|
|
child_node->lifetime = lifetime;
|
|
|
|
child_node->parent = parent_node;
|
|
|
|
memcpy(child_node->link_identifier, ((const unsigned char *)child) + 8, 8);
|
|
|
|
|
|
|
|
return child_node;
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
void
|
2016-06-08 12:05:37 +00:00
|
|
|
rpl_ns_init(void)
|
2016-02-01 17:02:33 +00:00
|
|
|
{
|
|
|
|
num_nodes = 0;
|
|
|
|
memb_init(&nodememb);
|
|
|
|
list_init(nodelist);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
2016-06-08 12:05:37 +00:00
|
|
|
rpl_ns_node_t *
|
|
|
|
rpl_ns_node_head(void)
|
2016-02-01 17:02:33 +00:00
|
|
|
{
|
|
|
|
return list_head(nodelist);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
2016-06-08 12:05:37 +00:00
|
|
|
rpl_ns_node_t *
|
|
|
|
rpl_ns_node_next(rpl_ns_node_t *item)
|
2016-02-01 17:02:33 +00:00
|
|
|
{
|
|
|
|
return list_item_next(item);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
void
|
|
|
|
rpl_ns_get_node_global_addr(uip_ipaddr_t *addr, rpl_ns_node_t *node)
|
|
|
|
{
|
|
|
|
if(addr != NULL && node != NULL && node->dag != NULL) {
|
|
|
|
memcpy(addr, &node->dag->dag_id, 8);
|
|
|
|
memcpy(((unsigned char *)addr) + 8, &node->link_identifier, 8);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
void
|
2016-06-08 12:05:37 +00:00
|
|
|
rpl_ns_periodic(void)
|
2016-02-01 17:02:33 +00:00
|
|
|
{
|
|
|
|
rpl_ns_node_t *l;
|
|
|
|
/* First pass, decrement lifetime for all nodes with non-infinite lifetime */
|
|
|
|
for(l = list_head(nodelist); l != NULL; l = list_item_next(l)) {
|
|
|
|
/* Don't touch infinite lifetime nodes */
|
|
|
|
if(l->lifetime != 0xffffffff && l->lifetime > 0) {
|
|
|
|
l->lifetime--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Second pass, for all expire nodes, deallocate them iff no child points to them */
|
|
|
|
for(l = list_head(nodelist); l != NULL; l = list_item_next(l)) {
|
|
|
|
if(l->lifetime == 0) {
|
|
|
|
rpl_ns_node_t *l2;
|
|
|
|
for(l2 = list_head(nodelist); l2 != NULL; l2 = list_item_next(l2)) {
|
|
|
|
if(l2->parent == l) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* No child found, deallocate node */
|
|
|
|
list_remove(nodelist, l);
|
|
|
|
memb_free(&nodememb, l);
|
|
|
|
num_nodes--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* RPL_WITH_NON_STORING */
|