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

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/*
* Copyright (c) 2010, Swedish Institute of Computer Science.
* 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
* Header file for rpl-neighbor module
* \author
* Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>,
* Simon DUquennoy <simon.duquennoy@inria.fr>
*
*/
#ifndef RPL_NEIGHBOR_H
#define RPL_NEIGHBOR_H
/********** Includes **********/
#include "net/rpl-lite/rpl.h"
#include "lib/list.h"
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#include "net/ipv6/uip.h"
#include "net/ipv6/uip-ds6.h"
#include "sys/ctimer.h"
/********** Public symbols **********/
/* Per-neighbor RPL information. According to RFC 6550, there exist three
* types of neighbors:
* - Candidate neighbor set: any neighbor, selected in an implementation
* and OF-specific way. The nodes in rpl_neighbors constitute the candidate neighbor set.
* - Parent set: the subset of the candidate neighbor set with rank below our rank
* - Preferred parent: one node of the parent set
*/
NBR_TABLE_DECLARE(rpl_neighbors);
/********** Public functions **********/
/**
* Initialize rpl-dag-neighbor module
*/
void rpl_neighbor_init(void);
/**
* Tells whether a neighbor is in the parent set.
*
* \param nbr The neighbor to be tested
* \return 1 if nbr is in the parent set, 0 otherwise
*/
int rpl_neighbor_is_parent(rpl_nbr_t *nbr);
/**
* Set current RPL preferred parent and update DS6 default route accordingly
*
* \param nbr The new preferred parent
*/
void rpl_neighbor_set_preferred_parent(rpl_nbr_t *nbr);
/**
* Tells wether we have fresh link information towards a given neighbor
*
* \param nbr The neighbor
* \return 1 if we have fresh link information, 0 otherwise
*/
int rpl_neighbor_is_fresh(rpl_nbr_t *nbr);
/**
* Tells wether we a given neighbor is reachable
*
* \param nbr The neighbor
* \return 1 if the parent is reachable, 0 otherwise
*/
int rpl_neighbor_is_reachable(rpl_nbr_t *nbr);
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/**
* Tells whether a nbr is acceptable as per the OF's definition
*
* \param nbr The neighbor
* \return 1 if acceptable, 0 otherwise
*/
int rpl_neighbor_is_acceptable_parent(rpl_nbr_t *nbr);
/**
* Returns a neighbor's link metric
*
* \param nbr The neighbor
* \return The link metric if any, 0xffff otherwise
*/
uint16_t rpl_neighbor_get_link_metric(rpl_nbr_t *nbr);
/**
* Returns our rank if selecting a given parent as preferred parent
*
* \param nbr The neighbor
* \return The resulting rank if any, RPL_INFINITE_RANK otherwise
*/
rpl_rank_t rpl_neighbor_rank_via_nbr(rpl_nbr_t *nbr);
/**
* Returns a neighbors's link-layer address
*
* \param nbr The neighbor
* \return The link-layer address if any, NULL otherwise
*/
const linkaddr_t *rpl_neighbor_get_lladdr(rpl_nbr_t *nbr);
/**
* Returns a neighbor's link statistics
*
* \param nbr The neighbor
* \return The link_stats structure address if any, NULL otherwise
*/
const struct link_stats *rpl_neighbor_get_link_stats(rpl_nbr_t *nbr);
/**
* Returns a neighbor's (link-local) IPv6 address
*
* \param nbr The neighbor
* \return The link-local IPv6 address if any, NULL otherwise
*/
uip_ipaddr_t *rpl_neighbor_get_ipaddr(rpl_nbr_t *nbr);
/**
* Returns a neighbor from its link-layer address
*
* \param addr The link-layer address
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* \return The neighbor if found, NULL otherwise
*/
rpl_nbr_t *rpl_neighbor_get_from_lladdr(uip_lladdr_t *addr);
/**
* Returns a neighbor from its link-local IPv6 address
*
* \param addr The link-local IPv6 address
* \return The neighbor if found, NULL otherwise
*/
rpl_nbr_t *rpl_neighbor_get_from_ipaddr(uip_ipaddr_t *addr);
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/**
* Returns the number of nodes in the RPL neighbor table
*
* \return the neighbor count
*/
int rpl_neighbor_count(void);
/**
* Prints a summary of all RPL neighbors and their properties
*
* \param str A descriptive text on the caller
*/
void rpl_neighbor_print_list(const char *str);
/**
* Empty the RPL neighbor table
*/
void rpl_neighbor_remove_all(void);
/**
* Returns the best candidate for preferred parent
*
* \return The best candidate, NULL if no usable parent is found
*/
rpl_nbr_t *rpl_neighbor_select_best(void);
typedef rpl_nbr_t rpl_parent_t;
#define rpl_parent_get_from_ipaddr(addr) rpl_neighbor_get_from_ipaddr(addr)
#define rpl_parent_get_ipaddr(nbr) rpl_neighbor_get_ipaddr(nbr)
/** @} */
#endif /* RPL_NEIGHBOR_H */