230 lines
7.3 KiB
C
230 lines
7.3 KiB
C
/*
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* Copyright (c) 2016, Inria.
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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 non-storing mode specific functions. Includes support for
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* source routing.
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*
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* \author Simon Duquennoy <simon.duquennoy@inria.fr>
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*/
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#include "net/rpl-classic/rpl-conf.h"
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#include "net/ipv6/uip.h"
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#include "net/ipv6/tcpip.h"
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#include "net/ipv6/uip-ds6.h"
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#include "net/ipv6/uip-icmp6.h"
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#include "net/rpl-classic/rpl-private.h"
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#include "net/rpl-classic/rpl-ns.h"
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#include "lib/list.h"
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#include "lib/memb.h"
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#if RPL_WITH_NON_STORING
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#define DEBUG DEBUG_NONE
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#include "net/ipv6/uip-debug.h"
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#include <limits.h>
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#include <string.h>
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/* Total number of nodes */
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static int num_nodes;
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/* Every known node in the network */
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LIST(nodelist);
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MEMB(nodememb, rpl_ns_node_t, RPL_NS_LINK_NUM);
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/*---------------------------------------------------------------------------*/
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int
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rpl_ns_num_nodes(void)
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{
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return num_nodes;
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}
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/*---------------------------------------------------------------------------*/
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static int
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node_matches_address(const rpl_dag_t *dag, const rpl_ns_node_t *node, const uip_ipaddr_t *addr)
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{
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return addr != NULL
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&& node != NULL
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&& dag != NULL
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&& dag == node->dag
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&& !memcmp(addr, &node->dag->dag_id, 8)
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&& !memcmp(((const unsigned char *)addr) + 8, node->link_identifier, 8);
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}
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/*---------------------------------------------------------------------------*/
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rpl_ns_node_t *
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rpl_ns_get_node(const rpl_dag_t *dag, const uip_ipaddr_t *addr)
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{
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rpl_ns_node_t *l;
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for(l = list_head(nodelist); l != NULL; l = list_item_next(l)) {
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/* Compare prefix and node identifier */
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if(node_matches_address(dag, l, addr)) {
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return l;
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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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int
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rpl_ns_is_node_reachable(const rpl_dag_t *dag, const uip_ipaddr_t *addr)
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{
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int max_depth = RPL_NS_LINK_NUM;
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rpl_ns_node_t *node = rpl_ns_get_node(dag, addr);
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rpl_ns_node_t *root_node = rpl_ns_get_node(dag, dag != NULL ? &dag->dag_id : NULL);
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while(node != NULL && node != root_node && max_depth > 0) {
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node = node->parent;
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max_depth--;
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}
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return node != NULL && node == root_node;
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_ns_expire_parent(rpl_dag_t *dag, const uip_ipaddr_t *child, const uip_ipaddr_t *parent)
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{
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rpl_ns_node_t *l = rpl_ns_get_node(dag, child);
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/* Check if parent matches */
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if(l != NULL && node_matches_address(dag, l->parent, parent)) {
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l->lifetime = RPL_NOPATH_REMOVAL_DELAY;
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}
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}
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/*---------------------------------------------------------------------------*/
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rpl_ns_node_t *
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rpl_ns_update_node(rpl_dag_t *dag, const uip_ipaddr_t *child, const uip_ipaddr_t *parent, uint32_t lifetime)
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{
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rpl_ns_node_t *child_node = rpl_ns_get_node(dag, child);
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rpl_ns_node_t *parent_node = rpl_ns_get_node(dag, parent);
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rpl_ns_node_t *old_parent_node;
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if(parent != NULL) {
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/* No node for the parent, add one with infinite lifetime */
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if(parent_node == NULL) {
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parent_node = rpl_ns_update_node(dag, parent, NULL, 0xffffffff);
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if(parent_node == NULL) {
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return NULL;
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}
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}
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}
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/* No node for this child, add one */
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if(child_node == NULL) {
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child_node = memb_alloc(&nodememb);
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/* No space left, abort */
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if(child_node == NULL) {
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return NULL;
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}
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child_node->parent = NULL;
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list_add(nodelist, child_node);
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num_nodes++;
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}
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/* Initialize node */
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child_node->dag = dag;
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child_node->lifetime = lifetime;
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memcpy(child_node->link_identifier, ((const unsigned char *)child) + 8, 8);
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/* Is the node reachable before the update? */
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if(rpl_ns_is_node_reachable(dag, child)) {
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old_parent_node = child_node->parent;
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/* Update node */
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child_node->parent = parent_node;
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/* Has the node become unreachable? May happen if we create a loop. */
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if(!rpl_ns_is_node_reachable(dag, child)) {
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/* The new parent makes the node unreachable, restore old parent.
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* We will take the update next time, with chances we know more of
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* the topology and the loop is gone. */
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child_node->parent = old_parent_node;
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}
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} else {
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child_node->parent = parent_node;
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}
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return child_node;
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_ns_init(void)
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{
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num_nodes = 0;
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memb_init(&nodememb);
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list_init(nodelist);
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}
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/*---------------------------------------------------------------------------*/
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rpl_ns_node_t *
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rpl_ns_node_head(void)
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{
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return list_head(nodelist);
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}
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/*---------------------------------------------------------------------------*/
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rpl_ns_node_t *
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rpl_ns_node_next(rpl_ns_node_t *item)
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{
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return list_item_next(item);
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_ns_get_node_global_addr(uip_ipaddr_t *addr, rpl_ns_node_t *node)
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{
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if(addr != NULL && node != NULL && node->dag != NULL) {
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memcpy(addr, &node->dag->dag_id, 8);
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memcpy(((unsigned char *)addr) + 8, &node->link_identifier, 8);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_ns_periodic(void)
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{
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rpl_ns_node_t *l;
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rpl_ns_node_t *next;
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/* First pass, for all expired nodes, deallocate them iff no child points to them */
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for(l = list_head(nodelist); l != NULL; l = next) {
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next = list_item_next(l);
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if(l->lifetime == 0) {
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rpl_ns_node_t *l2;
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for(l2 = list_head(nodelist); l2 != NULL; l2 = list_item_next(l2)) {
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if(l2->parent == l) {
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break;
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}
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}
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/* No child found, deallocate node */
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list_remove(nodelist, l);
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memb_free(&nodememb, l);
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num_nodes--;
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} else if(l->lifetime != 0xffffffff) {
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/* Decrement lifetime for all nodes with non-infinite lifetime */
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l->lifetime--;
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}
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}
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}
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#endif /* RPL_WITH_NON_STORING */
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