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94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*
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* Copyright (C) 2015 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup nhdp
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* @{
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*
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* @file
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* @brief Macros for NHDP metric computation
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*
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* The used infrastructure for exchanging metric values is based on the rules defined in the RFC
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* of <a href="https://tools.ietf.org/html/rfc7181">OLSRv2</a>. The calculations for the
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* Directional Airtime Metric (DAT) are based on
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* <a href="https://tools.ietf.org/html/draft-ietf-manet-olsrv2-dat-metric-05">DAT Draft v5</a>.
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*
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* @author Fabian Nack <nack@inf.fu-berlin.de>
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*/
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#ifndef NHDP_METRIC_H
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#define NHDP_METRIC_H
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#include "rfc5444/rfc5444.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @name NHDP protocol macros
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*
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* @{
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*/
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/** @brief Hop Count metric extension value for metric TLV extension field */
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#define NHDP_LMT_HOP_COUNT (163)
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/** @brief DAT metric extension value for metric TLV extension field */
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#define NHDP_LMT_DAT (165)
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/** @brief Used metric (change to switch to another metric type) */
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#define NHDP_METRIC (NHDP_LMT_HOP_COUNT)
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/** @brief Randomly chosen number for NHDP's metric timer event */
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#define NHDP_METRIC_TIMER (5445)
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/** @brief Macro controlling the start of a periodic timer event for matric computation */
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#define NHDP_METRIC_NEEDS_TIMER (NHDP_METRIC == NHDP_LMT_DAT)
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#define NHDP_METRIC_UNKNOWN (0)
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#define NHDP_METRIC_MINIMUM (RFC5444_METRIC_MIN)
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#define NHDP_METRIC_MAXIMUM (RFC5444_METRIC_MAX)
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/** @brief Default queue size for metrics using a queue to determine link loss */
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#define NHDP_Q_MEM_LENGTH (64)
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/** @brief Restart detection value for packet sequence number based link loss computation */
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#define NHDP_SEQNO_RESTART_DETECT (256)
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/** @brief Encoding for an incoming link metric value in metric TLV */
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#define NHDP_KD_LM_INC (0x8000)
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/** @brief Encoding for an outgoing link metric value in metric TLV */
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#define NHDP_KD_LM_OUT (0x4000)
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/** @brief Encoding for an incoming neighbor metric value in metric TLV */
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#define NHDP_KD_NM_INC (0x2000)
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/** @brief Encoding for an outgoing neighbor metric value in metric TLV */
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#define NHDP_KD_NM_OUT (0x1000)
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/** @} */
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/**
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* @name DAT metric specific macros
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*
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* @{
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*/
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/** @brief Length of RCVD and TOTAL queue of DAT metric */
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#define DAT_MEMORY_LENGTH (NHDP_Q_MEM_LENGTH)
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/** @brief Time between DAT metric refreshal */
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#define DAT_REFRESH_INTERVAL (1)
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/** @brief Factor to spread HELLO interval */
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#define DAT_HELLO_TIMEOUT_FACTOR (1.2)
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/** @brief Minimal supported bit rate in bps (default value for new links) */
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#define DAT_MINIMUM_BITRATE (1000)
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/** @brief Maximum allowed loss in expected/rcvd HELLOs (should not be changed) */
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#define DAT_MAXIMUM_LOSS (8)
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/** @brief Constant value needed for DAT metric computation (should not be changed) */
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#define DAT_CONSTANT (16777216)
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* NHDP_METRIC_H */
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