358 lines
12 KiB
C
358 lines
12 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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* Author: Joakim Eriksson, Nicolas Tsiftes
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*
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* $Id: rpl.h,v 1.23 2010/10/28 20:39:06 joxe Exp $
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*/
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#ifndef RPL_H
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#define RPL_H
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/*
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* ContikiRPL - an implementation of the routing protocol for low power and
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* lossy networks. See: draft-ietf-roll-rpl-09.
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*
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* --
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* The DIOs handle prefix information option for setting global IP addresses
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* on the nodes, but the current handling is not awaiting the join of the DAG
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* so it does not currently support multiple DAGs.
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*/
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#include "lib/list.h"
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#include "net/uip.h"
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#include "sys/clock.h"
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#include "sys/ctimer.h"
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#include "net/uip-ds6.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 1
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#endif /* RPL_CONF_STATS */
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/* The RPL Codes for the message types */
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#define RPL_CODE_DIS 0 /* DIS message */
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#define RPL_CODE_DIO 1 /* DIO message */
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#define RPL_CODE_DAO 2 /* DAO message */
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#define RPL_CODE_DAO_ACK 3 /* DAO ACK message */
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#define RPL_CODE_SEC_DIS 0x80 /* DIS message */
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#define RPL_CODE_SEC_DIO 0x81 /* DIO message */
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#define RPL_CODE_SEC_DAO 0x82 /* DAO message */
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#define RPL_CODE_SEC_DAO_ACK 0x83 /* DAO ACK message */
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/* RPL DIO/DAO suboption types */
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#define RPL_DIO_SUBOPT_PAD1 0 /* Pad1 */
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#define RPL_DIO_SUBOPT_PADN 1 /* PadN */
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#define RPL_DIO_SUBOPT_DAG_MC 2 /* DAG metric container */
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#define RPL_DIO_SUBOPT_ROUTE_INFO 3 /* Route information */
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#define RPL_DIO_SUBOPT_DAG_CONF 4 /* DAG configuration */
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#define RPL_DIO_SUBOPT_TARGET 5 /* Target */
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#define RPL_DIO_SUBOPT_TRANSIT 6 /* Transit information */
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#define RPL_DIO_SUBOPT_SOLICITED_INFO 7 /* Solicited information */
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#define RPL_DIO_SUBOPT_PREFIX_INFO 8 /* Prefix information option */
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#define RPL_DAO_K_FLAG 0x80 /* DAO ACK requested */
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#define RPL_DAO_D_FLAG 0x40 /* DODAG ID Present */
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/*---------------------------------------------------------------------------*/
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/* Default values for RPL constants and variables. */
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#define DEFAULT_DAO_LATENCY (CLOCK_SECOND * (1 + (random_rand() & 0xf)))
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/* Special value indicating immediate removal. */
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#define ZERO_LIFETIME 0
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/* Special value indicating that a DAO should not expire. */
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#define INFINITE_LIFETIME 0xffffffff
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/* Default route lifetime in seconds. */
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#define DEFAULT_ROUTE_LIFETIME INFINITE_LIFETIME
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#define DEFAULT_MIN_HOPRANKINC 256
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#define DEFAULT_MAX_RANKINC 3*DEFAULT_MIN_HOPRANKINC
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#define DAG_RANK(fixpt_rank, dag) ((fixpt_rank) / dag->min_hoprankinc)
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/* Rank of a node outside the LLN. */
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#define BASE_RANK 0
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/* Rank of a root node. */
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#define ROOT_RANK DEFAULT_MIN_HOPRANKINC
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#define INFINITE_RANK 0xffff
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#define RPL_DEFAULT_INSTANCE 0
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#define RPL_ANY_INSTANCE -1
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#define RPL_DEFAULT_OCP 1
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/* Represents 2^n ms. */
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/* Default alue according to the specification is 3 which
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means 8 milliseconds - this is not a reasonable value if
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using power-saving / duty-cycling */
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#define DEFAULT_DIO_INTERVAL_MIN 12
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/* Maximum amount of timer doublings. */
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#define DEFAULT_DIO_INTERVAL_DOUBLINGS 8
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/* Default DIO redundancy. */
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#define DEFAULT_DIO_REDUNDANCY 10
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/* Expire DAOs from neighbors that do not respond in this time. (seconds) */
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#define DAO_EXPIRATION_TIMEOUT 60
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/*---------------------------------------------------------------------------*/
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#define RPL_INSTANCE_LOCAL_FLAG 0x80
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#define RPL_INSTANCE_D_FLAG 0x40
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#define RPL_ROUTE_FROM_INTERNAL 0
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#define RPL_ROUTE_FROM_UNICAST_DAO 1
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#define RPL_ROUTE_FROM_MULTICAST_DAO 2
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#define RPL_ROUTE_FROM_DIO 3
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/* DAG Metric Container Object Types, to be confirmed by IANA. */
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#define RPL_DAG_MC_NSA 1
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#define RPL_DAG_MC_NE 2
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#define RPL_DAG_MC_HC 3
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#define RPL_DAG_MC_THROUGHPUT 4
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#define RPL_DAG_MC_LATENCY 5
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#define RPL_DAG_MC_LQL 6
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#define RPL_DAG_MC_ETX 7
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#define RPL_DAG_MC_LC 8
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/* DIS related */
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#define RPL_DIS_SEND 1
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#ifdef RPL_DIS_INTERVAL_CONF
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#define RPL_DIS_INTERVAL RPL_DIS_INTERVAL_CONF
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#else
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#define RPL_DIS_INTERVAL 60
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#endif
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#define RPL_DIS_START_DELAY 5
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typedef uint16_t rpl_rank_t;
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typedef uint16_t rpl_ocp_t;
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struct rpl_parent {
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struct rpl_parent *next;
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void *dag;
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uip_ipaddr_t addr;
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rpl_rank_t rank;
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uint8_t local_confidence;
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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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struct rpl_of {
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void (*reset)(void *);
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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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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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/* Logical representation of a DAG Information Object (DIO.) */
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struct rpl_dio {
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uip_ipaddr_t dag_id;
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rpl_ocp_t ocp;
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rpl_rank_t rank;
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uint8_t grounded;
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uint8_t dst_adv_trigger;
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uint8_t dst_adv_supported;
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uint8_t preference;
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uint8_t version;
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uint8_t instance_id;
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uint8_t dtsn;
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uint8_t dag_intdoubl;
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uint8_t dag_intmin;
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uint8_t dag_redund;
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rpl_rank_t dag_max_rankinc;
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rpl_rank_t dag_min_hoprankinc;
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rpl_prefix_t destination_prefix;
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rpl_prefix_t prefix_info;
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};
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typedef struct rpl_dio rpl_dio_t;
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#if RPL_CONF_STATS
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/* Statistics for fault management. */
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struct rpl_stats {
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uint16_t mem_overflows;
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uint16_t local_repairs;
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uint16_t global_repairs;
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uint16_t malformed_msgs;
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uint16_t resets;
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};
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typedef struct rpl_stats rpl_stats_t;
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extern rpl_stats_t rpl_stats;
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#define RPL_STAT(code) (code)
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#else
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#define RPL_STAT(code)
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#endif /* RPL_CONF_STATS */
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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_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 preference;
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uint8_t grounded;
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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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/* 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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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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uint16_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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/* RPL macros. */
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#define RPL_PARENT_COUNT(dag) list_length((dag)->parents)
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/*---------------------------------------------------------------------------*/
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/* ICMPv6 functions for RPL. */
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void dis_output(uip_ipaddr_t *addr);
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void dio_output(rpl_dag_t *, uip_ipaddr_t *uc_addr);
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void dao_output(rpl_parent_t *, uint32_t lifetime);
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void dao_ack_output(rpl_dag_t *, uip_ipaddr_t *, uint8_t);
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void uip_rpl_input(void);
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/* RPL logic functions. */
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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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void rpl_local_repair(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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void rpl_process_dio(uip_ipaddr_t *, rpl_dio_t *);
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int rpl_process_parent_event(rpl_dag_t *, rpl_parent_t *);
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/* DAG allocation and deallocation. */
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rpl_dag_t *rpl_alloc_dag(uint8_t);
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void rpl_free_dag(rpl_dag_t *);
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/* DAG parent management function. */
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rpl_parent_t *rpl_add_parent(rpl_dag_t *, rpl_dio_t *dio, uip_ipaddr_t *);
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rpl_parent_t *rpl_find_parent(rpl_dag_t *, uip_ipaddr_t *);
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int rpl_remove_parent(rpl_dag_t *, rpl_parent_t *);
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rpl_parent_t *rpl_select_parent(rpl_dag_t *dag);
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void rpl_recalculate_ranks(void);
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void rpl_join_dag(rpl_dag_t *);
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rpl_dag_t *rpl_get_dag(int instance_id);
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rpl_dag_t *rpl_find_dag(unsigned char aucIndex);
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/* RPL routing table functions. */
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void rpl_remove_routes(rpl_dag_t *dag);
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uip_ds6_route_t *rpl_add_route(rpl_dag_t *dag, uip_ipaddr_t *prefix,
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int prefix_len, uip_ipaddr_t *next_hop);
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void rpl_purge_routes(void);
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/* Objective function. */
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rpl_of_t *rpl_find_of(rpl_ocp_t);
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/* Timer functions. */
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void rpl_schedule_dao(rpl_dag_t *);
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void rpl_reset_dio_timer(rpl_dag_t *, uint8_t);
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void rpl_reset_periodic_timer(void);
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/* Route poisoning. */
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void rpl_poison_routes(rpl_dag_t *, rpl_parent_t *);
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/*---------------------------------------------------------------------------*/
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void rpl_init(void);
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#endif /* RPL_H */
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