nes-proj/os/net/routing/rpl-lite/rpl-dag.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-dag module
* \author
* Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>,
* Simon DUquennoy <simon.duquennoy@inria.fr>
*
*/
#ifndef RPL_DAG_H
#define RPL_DAG_H
/********** Includes **********/
#include "uip.h"
/********** Public functions **********/
/**
* Returns a textual description of the current DAG state
*
* \param state The DAG state
* \return The description string
*/
const char *rpl_dag_state_to_str(enum rpl_dag_state state);
/**
* Start poisoning and leave the DAG after a delay
*
*/
void rpl_dag_poison_and_leave(void);
/**
* Leaves the current DAG
*
*/
void rpl_dag_leave(void);
/**
* A function called periodically. Used to age the DAG (decrease lifetime
* and expire DAG accordingly)
*
* \param seconds The number of seconds elapsted since last call
*/
void rpl_dag_periodic(unsigned seconds);
/**
* Triggers a RPL global repair
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*
* \param str A textual description of the cause for triggering a repair
*/
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void rpl_global_repair(const char *str);
/**
* Triggers a RPL local repair
*
* \param str A textual description of the cause for triggering a repair
*/
void rpl_local_repair(const char *str);
/**
* Tells whether a given global IPv6 address is in our current DAG
*
* \param addr The global IPv6 address to be tested
* \return 1 if addr is in our current DAG, 0 otherwise
*/
int rpl_is_addr_in_our_dag(const uip_ipaddr_t *addr);
/**
* Initializes DAG internal structure for a root node
*
* \param instance_id The instance ID
* \param dag_id The DAG ID
* \param prefix The prefix
* \param prefix_len The prefix length
* \param flags The prefix flags (from DIO)
*/
void rpl_dag_init_root(uint8_t instance_id, uip_ipaddr_t *dag_id,
uip_ipaddr_t *prefix, unsigned prefix_len, uint8_t flags);
/**
* Returns pointer to the default instance (for compatibility with legagy RPL code)
*
* \return A pointer to the only supported instance
*/
rpl_instance_t *rpl_get_default_instance(void);
/**
* Returns pointer to any DAG (for compatibility with legagy RPL code)
*
* \return A pointer to the only supported DAG
*/
rpl_dag_t *rpl_get_any_dag(void);
/**
* Processes Hop-by-Hop (HBH) Extension Header of a packet currently being forwrded.
*
* \param sender The IPv6 address of the originator
* \param sender_rank The rank advertised by the sender in the HBH header
* \param loop_detected 1 if we could detect a loop while forwarding, 0 otherwise
* \param rank_error_signaled 1 if the HBH header advertises a rank error, 0 otherwise
* \return 1 if the packet is to be forwarded, 0 if it is to be dropped
*/
int rpl_process_hbh(rpl_nbr_t *sender, uint16_t sender_rank, int loop_detected, int rank_error_signaled);
/**
* Processes incoming DIS
*
* \param from The IPv6 address of the originator
* \param is_multicast Set to 1 for multicast DIS, 0 for unicast DIS
*/
void rpl_process_dis(uip_ipaddr_t *from, int is_multicast);
/**
* Processes incoming DIO
*
* \param from The IPv6 address of the originator
* \param dio A pointer to a parsed DIO
*/
void rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio);
/**
* Processes incoming DAO
*
* \param from The IPv6 address of the originator
* \param dao A pointer to a parsed DAO
*/
void rpl_process_dao(uip_ipaddr_t *from, rpl_dao_t *dao);
/**
* Processes incoming DAO-ACK
*
* \param sequence The DAO-ACK sequence number
* \param status The DAO-ACK status (see RPL_DAO_ACK_* defines)
*/
void rpl_process_dao_ack(uint8_t sequence, uint8_t status);
/**
* Tells whether RPL is ready to advertise the DAG
*
* \return 1 is ready, 0 otherwise
*/
int rpl_dag_ready_to_advertise(void);
/**
* Updates RPL internal state: selects preferred parent, updates rank & metreic
* container, triggers control traffic accordingly and updates uIP6 internal state.
*/
void rpl_dag_update_state(void);
/**
* Initializes rpl-dag module
*/
void rpl_dag_init(void);
/** @} */
#endif /* RPL_DAG_H */