nes-proj/os/net/rpl-lite/rpl-ns.h

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/*
* 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.
*/
/**
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* \addtogroup rpl-lite
* @{
*
* \file
* RPL non-storing mode specific functions. Includes support for
* source routing.
*
* \author Simon Duquennoy <simon.duquennoy@inria.fr>
*/
#ifndef RPL_NS_H
#define RPL_NS_H
/********** Includes **********/
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#include "net/ipv6/uip.h"
#include "net/rpl-lite/rpl.h"
/********** Data Structures **********/
/* A node in a RPL Non-storing graph, stored at the root and representing
* all child-parent relationship. Used to build source routes */
typedef struct rpl_ns_node {
struct rpl_ns_node *next;
uint32_t lifetime;
rpl_dag_t *dag;
/* Store only IPv6 link identifiers as all nodes in the DAG share the same prefix */
unsigned char link_identifier[8];
struct rpl_ns_node *parent;
} rpl_ns_node_t;
/********** Public functions **********/
/**
* Tells how many nodes are currently stored in the graph
*
* \return The number of nodes
*/
int rpl_ns_num_nodes(void);
/**
* Expires a given child-parent link
*
* \param child The IPv6 address of the child
* \param parent The IPv6 address of the parent
*/
void rpl_ns_expire_parent(const uip_ipaddr_t *child, const uip_ipaddr_t *parent);
/**
* Updates a child-parent link
*
* \param child The IPv6 address of the child
* \param parent The IPv6 address of the parent
* \param lifetime The link lifetime in seconds
*/
rpl_ns_node_t *rpl_ns_update_node(const uip_ipaddr_t *child, const uip_ipaddr_t *parent, uint32_t lifetime);
/**
* Returns the head of the non-storing node list
*
* \return The head of the list
*/
rpl_ns_node_t *rpl_ns_node_head(void);
/**
* Returns the next element of the non-storing node list
*
* \param item The current element in the list
* \return The next element of the list
*/
rpl_ns_node_t *rpl_ns_node_next(rpl_ns_node_t *item);
/**
* Looks up for a RPL NS node from its IPv6 global address
*
* \param addr The target address
* \return A pointer to the node
*/
rpl_ns_node_t *rpl_ns_get_node(const uip_ipaddr_t *addr);
/**
* Telle whether an address is reachable, i.e. if there exists a path from
* the root to the node in the current RPL NS graph
*
* \param addr The target IPv6 global address
* \return 1 if the node is reachable, 0 otherwise
*/
int rpl_ns_is_addr_reachable(const uip_ipaddr_t *addr);
/**
* Finds the global address of a given node
*
* \param addr A pointer to the address to be written
* \param node The target node
* \return 1 if success, 0 otherwise
*/
int rpl_ns_get_node_global_addr(uip_ipaddr_t *addr, rpl_ns_node_t *node);
/**
* A function called periodically. Used to age the links (decrease lifetime
* and expire links accordingly)
*
* \param seconds The number of seconds elapsted since last call
*/
void rpl_ns_periodic(unsigned seconds);
/**
* Initialize rpl-ns module
*/
void rpl_ns_init(void);
/**
* Deallocate all neighbors
*/
void rpl_ns_free_all(void);
/** @} */
#endif /* RPL_NS_H */