260 lines
9.1 KiB
C
260 lines
9.1 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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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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* \file
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* ContikiRPL - an implementation of the routing protocol for low
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* power and lossy networks. See: draft-ietf-roll-rpl-17.
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* \author
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* Joakim Eriksson <joakime@sics.se> & Nicolas Tsiftes <nvt@sics.se>
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*
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*/
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#ifndef RPL_H
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#define RPL_H
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#include "lib/list.h"
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#include "net/uip.h"
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#include "net/uip-ds6.h"
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#include "sys/ctimer.h"
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/* set to 1 for some statistics on trickle / DIO */
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#ifndef RPL_CONF_STATS
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#define RPL_CONF_STATS 0
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#endif /* RPL_CONF_STATS */
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/*
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* Select routing metric supported at runtime. This must be a valid
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* DAG Metric Container Object Type (see below). Currently, we only
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* support RPL_DAG_MC_ETX and RPL_DAG_MC_ENERGY.
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*/
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#ifdef RPL_CONF_DAG_MC
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#define RPL_DAG_MC RPL_CONF_DAG_MC
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#else
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#define RPL_DAG_MC RPL_DAG_MC_ETX
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#endif /* RPL_CONF_DAG_MC */
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/*
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* The objective function used by RPL is configurable through the
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* RPL_CONF_OF parameter. This should be defined to be the name of an
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* rpl_of_t object linked into the system image, e.g., rpl_of0.
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*/
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#ifdef RPL_CONF_OF
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#define RPL_OF RPL_CONF_OF
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#else
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/* ETX is the default objective function. */
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#define RPL_OF rpl_of_etx
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#endif /* RPL_CONF_OF */
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/* This value decides which DAG instance we should participate in by default. */
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#define RPL_DEFAULT_INSTANCE 0
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/* This value is used to access an arbitrary DAG. It will likely be
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replaced when we support multiple DAGs more. */
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#define RPL_ANY_INSTANCE -1
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/*---------------------------------------------------------------------------*/
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/* The amount of parents that this node has in a particular DAG. */
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#define RPL_PARENT_COUNT(dag) list_length((dag)->parents)
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/*---------------------------------------------------------------------------*/
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typedef uint16_t rpl_rank_t;
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typedef uint16_t rpl_ocp_t;
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/*---------------------------------------------------------------------------*/
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/* DAG Metric Container Object Types, to be confirmed by IANA. */
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#define RPL_DAG_MC_NONE 0 /* Local identifier for empty MC */
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#define RPL_DAG_MC_NSA 1 /* Node State and Attributes */
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#define RPL_DAG_MC_ENERGY 2 /* Node Energy */
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#define RPL_DAG_MC_HOPCOUNT 3 /* Hop Count */
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#define RPL_DAG_MC_THROUGHPUT 4 /* Throughput */
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#define RPL_DAG_MC_LATENCY 5 /* Latency */
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#define RPL_DAG_MC_LQL 6 /* Link Quality Level */
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#define RPL_DAG_MC_ETX 7 /* Expected Transmission Count
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*/
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#define RPL_DAG_MC_LC 8 /* Link Color */
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/* DAG Metric Container flags. */
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#define RPL_DAG_MC_FLAG_P 0x8
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#define RPL_DAG_MC_FLAG_C 0x4
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#define RPL_DAG_MC_FLAG_O 0x2
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#define RPL_DAG_MC_FLAG_R 0x1
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/* DAG Metric Container aggregation mode. */
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#define RPL_DAG_MC_AGGR_ADDITIVE 0
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#define RPL_DAG_MC_AGGR_MAXIMUM 1
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#define RPL_DAG_MC_AGGR_MINIMUM 2
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#define RPL_DAG_MC_AGGR_MULTIPLICATIVE 3
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/* The bit index within the flags field of
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the rpl_metric_object_energy structure. */
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#define RPL_DAG_MC_ENERGY_INCLUDED 3
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#define RPL_DAG_MC_ENERGY_TYPE 1
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#define RPL_DAG_MC_ENERGY_ESTIMATION 0
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#define RPL_DAG_MC_ENERGY_TYPE_MAINS 0
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#define RPL_DAG_MC_ENERGY_TYPE_BATTERY 1
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#define RPL_DAG_MC_ENERGY_TYPE_SCAVENGING 2
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struct rpl_metric_object_energy {
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uint8_t flags;
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uint8_t energy_est;
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};
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/* Logical representation of a DAG Metric Container. */
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struct rpl_metric_container {
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uint8_t type;
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uint8_t flags;
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uint8_t aggr;
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uint8_t prec;
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uint8_t length;
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union metric_object {
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struct rpl_metric_object_energy energy;
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uint16_t etx;
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} obj;
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};
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typedef struct rpl_metric_container rpl_metric_container_t;
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/*---------------------------------------------------------------------------*/
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struct rpl_dag;
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/*---------------------------------------------------------------------------*/
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struct rpl_parent {
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struct rpl_parent *next;
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struct rpl_dag *dag;
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rpl_metric_container_t mc;
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uip_ipaddr_t addr;
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rpl_rank_t rank;
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uint8_t link_metric;
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uint8_t dtsn;
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uint8_t updated;
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};
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typedef struct rpl_parent rpl_parent_t;
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/*---------------------------------------------------------------------------*/
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/*
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* API for RPL objective functions (OF)
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*
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* reset(dag)
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*
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* Resets the objective function state for a specific DAG. This function is
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* called when doing a global repair on the DAG.
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*
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* parent_state_callback(parent, known, etx)
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*
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* Receives link-layer neighbor information. The parameter "known" is set
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* either to 0 or 1. The "etx" parameter specifies the current
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* ETX(estimated transmissions) for the neighbor.
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*
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* best_parent(parent1, parent2)
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*
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* Compares two parents and returns the best one, according to the OF.
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*
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* calculate_rank(parent, base_rank)
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*
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* Calculates a rank value using the parent rank and a base rank.
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* If "parent" is NULL, the objective function selects a default increment
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* that is adds to the "base_rank". Otherwise, the OF uses information known
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* about "parent" to select an increment to the "base_rank".
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*
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* update_metric_container(dag)
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*
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* Updates the metric container for outgoing DIOs in a certain DAG.
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* If the objective function of the DAG does not use metric containers,
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* the function should set the object type to RPL_DAG_MC_NONE.
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*/
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struct rpl_of {
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void (*reset)(struct rpl_dag *);
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void (*parent_state_callback)(rpl_parent_t *, int, int);
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rpl_parent_t *(*best_parent)(rpl_parent_t *, rpl_parent_t *);
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rpl_rank_t (*calculate_rank)(rpl_parent_t *, rpl_rank_t);
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void (*update_metric_container)(struct rpl_dag *);
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rpl_ocp_t ocp;
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};
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typedef struct rpl_of rpl_of_t;
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/*---------------------------------------------------------------------------*/
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/* RPL DIO prefix suboption */
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struct rpl_prefix {
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uip_ipaddr_t prefix;
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uint32_t lifetime;
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uint8_t length;
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uint8_t flags;
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};
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typedef struct rpl_prefix rpl_prefix_t;
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/*---------------------------------------------------------------------------*/
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/* Directed Acyclic Graph */
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struct rpl_dag {
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/* DAG configuration */
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rpl_metric_container_t mc;
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rpl_of_t *of;
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uip_ipaddr_t dag_id;
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/* The current default router - used for routing "upwards" */
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uip_ds6_defrt_t *def_route;
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rpl_rank_t rank;
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rpl_rank_t min_rank; /* should be reset per DODAG iteration! */
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uint8_t dtsn_out;
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uint8_t instance_id;
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uint8_t version;
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uint8_t grounded;
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uint8_t mop;
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uint8_t preference;
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uint8_t dio_intdoubl;
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uint8_t dio_intmin;
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uint8_t dio_redundancy;
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rpl_rank_t max_rankinc;
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rpl_rank_t min_hoprankinc;
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uint8_t used;
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uint8_t default_lifetime;
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uint16_t lifetime_unit; /* lifetime in seconds = l_u * d_l */
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/* live data for the DAG */
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uint8_t joined;
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uint8_t dio_intcurrent;
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uint8_t dio_send; /* for keeping track of which mode the timer is in
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*/
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uint8_t dio_counter;
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#if RPL_CONF_STATS
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uint16_t dio_totint;
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uint16_t dio_totsend;
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uint16_t dio_totrecv;
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#endif /* RPL_CONF_STATS */
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uint32_t dio_next_delay; /* delay for completion of dio interval */
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struct ctimer dio_timer;
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struct ctimer dao_timer;
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rpl_parent_t *preferred_parent;
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void *parent_list;
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list_t parents;
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rpl_prefix_t prefix_info;
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};
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typedef struct rpl_dag rpl_dag_t;
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/*---------------------------------------------------------------------------*/
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/* Public RPL functions. */
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void rpl_init(void);
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rpl_dag_t *rpl_set_root(uip_ipaddr_t *);
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int rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, int len);
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int rpl_repair_dag(rpl_dag_t *dag);
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int rpl_set_default_route(rpl_dag_t *dag, uip_ipaddr_t *from);
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rpl_dag_t *rpl_get_dag(int instance_id);
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/*---------------------------------------------------------------------------*/
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#endif /* RPL_H */
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