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