322 lines
11 KiB
C
322 lines
11 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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* Public API declarations for ContikiRPL.
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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 "rpl-conf.h"
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#include "lib/list.h"
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#include "net/ip/uip.h"
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#include "net/ipv6/uip-ds6.h"
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#include "sys/ctimer.h"
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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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#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_instance;
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struct rpl_dag;
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/*---------------------------------------------------------------------------*/
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#define RPL_PARENT_FLAG_UPDATED 0x1
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#define RPL_PARENT_FLAG_LINK_METRIC_VALID 0x2
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struct rpl_parent {
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struct rpl_dag *dag;
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#if RPL_DAG_MC != RPL_DAG_MC_NONE
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rpl_metric_container_t mc;
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#endif /* RPL_DAG_MC != RPL_DAG_MC_NONE */
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rpl_rank_t rank;
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clock_time_t last_tx_time;
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uint8_t dtsn;
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uint8_t flags;
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};
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typedef struct rpl_parent rpl_parent_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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uip_ipaddr_t dag_id;
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rpl_rank_t min_rank; /* should be reset per DAG iteration! */
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uint8_t version;
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uint8_t grounded;
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uint8_t preference;
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uint8_t used;
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/* live data for the DAG */
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uint8_t joined;
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rpl_parent_t *preferred_parent;
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rpl_rank_t rank;
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struct rpl_instance *instance;
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rpl_prefix_t prefix_info;
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uint32_t lifetime;
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};
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typedef struct rpl_dag rpl_dag_t;
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typedef struct rpl_instance rpl_instance_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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* neighbor_link_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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* best_dag(dag1, dag2)
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*
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* Compares two DAGs 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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* dao_ack_callback(parent, status)
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*
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* A callback on the result of the DAO ACK. Similar to the neighbor link
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* callback. A failed DAO_ACK (NACK) can be used for switching to another
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* parent via changed link metric or other mechanisms.
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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 (*neighbor_link_callback)(rpl_parent_t *, int, int);
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#if RPL_WITH_DAO_ACK
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void (*dao_ack_callback)(rpl_parent_t *, int status);
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#endif
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rpl_parent_t *(*best_parent)(rpl_parent_t *, rpl_parent_t *);
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rpl_dag_t *(*best_dag)(rpl_dag_t *, rpl_dag_t *);
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rpl_rank_t (*calculate_rank)(rpl_parent_t *, rpl_rank_t);
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void (*update_metric_container)( rpl_instance_t *);
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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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/* Declare the selected objective function. */
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extern rpl_of_t RPL_OF;
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/*---------------------------------------------------------------------------*/
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/* Instance */
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struct rpl_instance {
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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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rpl_dag_t *current_dag;
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rpl_dag_t dag_table[RPL_MAX_DAG_PER_INSTANCE];
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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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uint8_t instance_id;
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uint8_t used;
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uint8_t dtsn_out;
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uint8_t mop;
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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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uint8_t default_lifetime;
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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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uint8_t dio_counter;
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/* my last registered DAO that I might be waiting for ACK on */
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uint8_t my_dao_seqno;
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uint8_t my_dao_transmissions;
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/* this is intended to keep track if this instance have a route downward */
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uint8_t has_downward_route;
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rpl_rank_t max_rankinc;
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rpl_rank_t min_hoprankinc;
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uint16_t lifetime_unit; /* lifetime in seconds = l_u * d_l */
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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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clock_time_t dio_next_delay; /* delay for completion of dio interval */
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#if RPL_WITH_PROBING
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struct ctimer probing_timer;
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#endif /* RPL_WITH_PROBING */
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struct ctimer dio_timer;
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struct ctimer dao_timer;
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struct ctimer dao_lifetime_timer;
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struct ctimer unicast_dio_timer;
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rpl_parent_t *unicast_dio_target;
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#if RPL_WITH_DAO_ACK
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struct ctimer dao_retransmit_timer;
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#endif /* RPL_WITH_DAO_ACK */
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};
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/*---------------------------------------------------------------------------*/
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/* Public RPL functions. */
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void rpl_init(void);
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void uip_rpl_input(void);
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rpl_dag_t *rpl_set_root(uint8_t instance_id, uip_ipaddr_t *dag_id);
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int rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, unsigned len);
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int rpl_repair_root(uint8_t instance_id);
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int rpl_set_default_route(rpl_instance_t *instance, uip_ipaddr_t *from);
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rpl_dag_t *rpl_get_any_dag(void);
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rpl_instance_t *rpl_get_instance(uint8_t instance_id);
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int rpl_update_header_empty(void);
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int rpl_update_header_final(uip_ipaddr_t *addr);
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int rpl_verify_header(int);
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void rpl_insert_header(void);
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void rpl_remove_header(void);
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uint8_t rpl_invert_header(void);
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uip_ipaddr_t *rpl_get_parent_ipaddr(rpl_parent_t *nbr);
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rpl_parent_t *rpl_get_parent(uip_lladdr_t *addr);
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rpl_rank_t rpl_get_parent_rank(uip_lladdr_t *addr);
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uint16_t rpl_get_parent_link_metric(const uip_lladdr_t *addr);
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void rpl_dag_init(void);
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uip_ds6_nbr_t *rpl_get_nbr(rpl_parent_t *parent);
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void rpl_print_neighbor_list(void);
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/* Per-parent RPL information */
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NBR_TABLE_DECLARE(rpl_parents);
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/**
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* RPL modes
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*
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* The RPL module can be in either of three modes: mesh mode
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* (RPL_MODE_MESH), feater mode (RPL_MODE_FEATHER), and leaf mode
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* (RPL_MODE_LEAF). In mesh mode, nodes forward data for other nodes,
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* and are reachable by others. In feather mode, nodes can forward
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* data for other nodes, but are not reachable themselves. In leaf
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* mode, nodes do not forward data for others, but are reachable by
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* others. */
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enum rpl_mode {
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RPL_MODE_MESH = 0,
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RPL_MODE_FEATHER = 1,
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RPL_MODE_LEAF = 2,
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};
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/**
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* Set the RPL mode
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*
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* \param mode The new RPL mode
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* \retval The previous RPL mode
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*/
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enum rpl_mode rpl_set_mode(enum rpl_mode mode);
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/**
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* Get the RPL mode
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*
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* \retval The RPL mode
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*/
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enum rpl_mode rpl_get_mode(void);
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/**
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* Get the RPL's best guess on if we have downward route or not.
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*
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* \retval 1 if we have a downward route from RPL Root, 0 if not.
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*/
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int rpl_has_downward_route(void);
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/*---------------------------------------------------------------------------*/
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#endif /* RPL_H */
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