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contiki/core/net/rpl/rpl.h
Nicolas Tsiftes 93a7280a1a Replaced old description
2011-02-15 18:10:15 +01:00

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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.
*
* \file
* ContikiRPL - an implementation of the routing protocol for low
* power and lossy networks. See: draft-ietf-roll-rpl-17.
* \author
* Joakim Eriksson <joakime@sics.se> & Nicolas Tsiftes <nvt@sics.se>
*
*/
#ifndef RPL_H
#define RPL_H
#include "lib/list.h"
#include "net/uip.h"
#include "net/uip-ds6.h"
#include "sys/ctimer.h"
/* set to 1 for some statistics on trickle / DIO */
#ifndef RPL_CONF_STATS
#define RPL_CONF_STATS 0
#endif /* RPL_CONF_STATS */
/*
* The objective function used by RPL is configurable through the
* RPL_CONF_OF parameter. This should be defined to be the name of an
* rpl_of_t object linked into the system image, e.g., rpl_of0.
*/
#ifdef RPL_CONF_OF
#define RPL_OF RPL_CONF_OF
#else
/* ETX is the default objective function. */
#define RPL_OF rpl_of_etx
#endif /* RPL_CONF_OF */
/* This value decides which DAG instance we should participate in by default. */
#define RPL_DEFAULT_INSTANCE 0
/* This value is used to access an arbitrary DAG. It will likely be
replaced when we support multiple DAGs more. */
#define RPL_ANY_INSTANCE -1
/*---------------------------------------------------------------------------*/
/* The amount of parents that this node has in a particular DAG. */
#define RPL_PARENT_COUNT(dag) list_length((dag)->parents)
/*---------------------------------------------------------------------------*/
typedef uint16_t rpl_rank_t;
typedef uint16_t rpl_ocp_t;
/*---------------------------------------------------------------------------*/
/* DAG Metric Container Object Types, to be confirmed by IANA. */
#define RPL_DAG_MC_NONE 0 /* Local identifier for empty MC */
#define RPL_DAG_MC_NSA 1 /* Node State and Attributes */
#define RPL_DAG_MC_NE 2 /* Node Energy */
#define RPL_DAG_MC_HC 3 /* Hop Count */
#define RPL_DAG_MC_THROUGHPUT 4 /* Throughput */
#define RPL_DAG_MC_LATENCY 5 /* Latency */
#define RPL_DAG_MC_LQL 6 /* Link Quality Level */
#define RPL_DAG_MC_ETX 7 /* Expected Transmission Count
*/
#define RPL_DAG_MC_LC 8 /* Link Color */
/* DAG Metric Container flags. */
#define RPL_DAG_MC_FLAG_P 0x8
#define RPL_DAG_MC_FLAG_C 0x4
#define RPL_DAG_MC_FLAG_O 0x2
#define RPL_DAG_MC_FLAG_R 0x1
/* DAG Metric Container aggregation mode. */
#define RPL_DAG_MC_AGGR_ADDITIVE 0
#define RPL_DAG_MC_AGGR_MAXIMUM 1
#define RPL_DAG_MC_AGGR_MINIMUM 2
#define RPL_DAG_MC_AGGR_MULTIPLICATIVE 3
/* Logical representation of an ETX object in a DAG Metric Container. */
struct rpl_metric_object_etx {
uint16_t etx;
};
/* Logical representation of a DAG Metric Container. */
struct rpl_metric_container {
uint8_t type;
uint8_t flags;
uint8_t aggr;
uint8_t prec;
uint8_t length;
/* Once we support more objects, the etx field will be replaced by a
union of those. */
struct rpl_metric_object_etx etx;
};
typedef struct rpl_metric_container rpl_metric_container_t;
/*---------------------------------------------------------------------------*/
struct rpl_dag;
/*---------------------------------------------------------------------------*/
struct rpl_parent {
struct rpl_parent *next;
struct rpl_dag *dag;
rpl_metric_container_t mc;
uip_ipaddr_t addr;
rpl_rank_t rank;
uint8_t etx;
uint8_t dtsn;
uint8_t updated;
};
typedef struct rpl_parent rpl_parent_t;
/*---------------------------------------------------------------------------*/
/*
* API for RPL objective functions (OF)
*
* reset(dag)
*
* Resets the objective function state for a specific DAG. This function is
* called when doing a global repair on the DAG.
*
* parent_state_callback(parent, known, etx)
*
* Receives link-layer neighbor information. The parameter "known" is set
* either to 0 or 1. The "etx" parameter specifies the current
* ETX(estimated transmissions) for the neighbor.
*
* best_parent(parent1, parent2)
*
* Compares two parents and returns the best one, according to the OF.
*
* calculate_rank(parent, base_rank)
*
* Calculates a rank value using the parent rank and a base rank.
* If "parent" is NULL, the objective function selects a default increment
* that is adds to the "base_rank". Otherwise, the OF uses information known
* about "parent" to select an increment to the "base_rank".
*
* update_metric_container(dag)
*
* Updates the metric container for outgoing DIOs in a certain DAG.
* If the objective function of the DAG does not use metric containers,
* the function should set the object type to RPL_DAG_MC_NONE.
*/
struct rpl_of {
void (*reset)(struct rpl_dag *);
void (*parent_state_callback)(rpl_parent_t *, int, int);
rpl_parent_t *(*best_parent)(rpl_parent_t *, rpl_parent_t *);
rpl_rank_t (*calculate_rank)(rpl_parent_t *, rpl_rank_t);
void (*update_metric_container)(struct rpl_dag *);
rpl_ocp_t ocp;
};
typedef struct rpl_of rpl_of_t;
/*---------------------------------------------------------------------------*/
/* RPL DIO prefix suboption */
struct rpl_prefix {
uip_ipaddr_t prefix;
uint32_t lifetime;
uint8_t length;
uint8_t flags;
};
typedef struct rpl_prefix rpl_prefix_t;
/*---------------------------------------------------------------------------*/
/* Directed Acyclic Graph */
struct rpl_dag {
/* DAG configuration */
rpl_metric_container_t mc;
rpl_of_t *of;
uip_ipaddr_t dag_id;
/* The current default router - used for routing "upwards" */
uip_ds6_defrt_t *def_route;
rpl_rank_t rank;
rpl_rank_t min_rank; /* should be reset per DODAG iteration! */
uint8_t dtsn_out;
uint8_t instance_id;
uint8_t version;
uint8_t grounded;
uint8_t mop;
uint8_t preference;
uint8_t dio_intdoubl;
uint8_t dio_intmin;
uint8_t dio_redundancy;
rpl_rank_t max_rankinc;
rpl_rank_t min_hoprankinc;
uint8_t used;
uint8_t default_lifetime;
uint16_t lifetime_unit; /* lifetime in seconds = l_u * d_l */
/* live data for the DAG */
uint8_t joined;
uint8_t dio_intcurrent;
uint8_t dio_send; /* for keeping track of which mode the timer is in
*/
uint8_t dio_counter;
#if RPL_CONF_STATS
uint16_t dio_totint;
uint16_t dio_totsend;
uint16_t dio_totrecv;
#endif /* RPL_CONF_STATS */
uint32_t dio_next_delay; /* delay for completion of dio interval */
struct ctimer dio_timer;
struct ctimer dao_timer;
rpl_parent_t *preferred_parent;
void *parent_list;
list_t parents;
rpl_prefix_t prefix_info;
};
typedef struct rpl_dag rpl_dag_t;
/*---------------------------------------------------------------------------*/
/* Public RPL functions. */
void rpl_init(void);
rpl_dag_t *rpl_set_root(uip_ipaddr_t *);
int rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, int len);
int rpl_repair_dag(rpl_dag_t *dag);
int rpl_set_default_route(rpl_dag_t *dag, uip_ipaddr_t *from);
rpl_dag_t *rpl_get_dag(int instance_id);
/*---------------------------------------------------------------------------*/
#endif /* RPL_H */
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