150 lines
4.4 KiB
C
150 lines
4.4 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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#ifndef RPL_NS_H
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#define RPL_NS_H
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/********** Includes **********/
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#include "net/ip/uip.h"
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#include "net/rpl-lite/rpl.h"
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/**
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* \addtogroup uip6
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* @{
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*/
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/********** Data Structures **********/
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/* A node in a RPL Non-storing graph, stored at the root and representing
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* all child-parent relationship. Used to build source routes */
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typedef struct rpl_ns_node {
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struct rpl_ns_node *next;
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uint32_t lifetime;
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rpl_dag_t *dag;
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/* Store only IPv6 link identifiers as all nodes in the DAG share the same prefix */
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unsigned char link_identifier[8];
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struct rpl_ns_node *parent;
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} rpl_ns_node_t;
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/********** Public functions **********/
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/**
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* Tells how many nodes are currently stored in the graph
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*
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* \return The number of nodes
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*/
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int rpl_ns_num_nodes(void);
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/**
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* Expires a given child-parent link
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*
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* \param child The IPv6 address of the child
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* \param parent The IPv6 address of the parent
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*/
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void rpl_ns_expire_parent(const uip_ipaddr_t *child, const uip_ipaddr_t *parent);
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/**
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* Updates a child-parent link
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*
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* \param child The IPv6 address of the child
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* \param parent The IPv6 address of the parent
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* \param lifetime The link lifetime in seconds
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*/
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rpl_ns_node_t *rpl_ns_update_node(const uip_ipaddr_t *child, const uip_ipaddr_t *parent, uint32_t lifetime);
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/**
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* Returns the head of the non-storing node list
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*
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* \return The head of the list
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*/
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rpl_ns_node_t *rpl_ns_node_head(void);
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/**
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* Returns the next element of the non-storing node list
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*
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* \param item The current element in the list
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* \return The next element of the list
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*/
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rpl_ns_node_t *rpl_ns_node_next(rpl_ns_node_t *item);
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/**
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* Looks up for a RPL NS node from its IPv6 global address
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*
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* \param addr The target address
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* \return A pointer to the node
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*/
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rpl_ns_node_t *rpl_ns_get_node(const uip_ipaddr_t *addr);
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/**
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* Telle whether an address is reachable, i.e. if there exists a path from
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* the root to the node in the current RPL NS graph
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*
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* \param addr The target IPv6 global address
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* \return 1 if the node is reachable, 0 otherwise
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*/
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int rpl_ns_is_addr_reachable(const uip_ipaddr_t *addr);
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/**
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* Finds the global address of a given node
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*
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* \param addr A pointer to the address to be written
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* \param node The target node
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* \return 1 if success, 0 otherwise
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*/
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int rpl_ns_get_node_global_addr(uip_ipaddr_t *addr, rpl_ns_node_t *node);
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/**
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* A function called periodically. Used to age the links (decrease lifetime
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* and expire links accordingly)
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*
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* \param seconds The number of seconds elapsted since last call
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*/
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void rpl_ns_periodic(unsigned seconds);
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/**
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* Initialize rpl-ns module
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*/
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void rpl_ns_init(void);
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/** @} */
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#endif /* RPL_NS_H */
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