radiotap-header.cc

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/*
 * Copyright (c) 2009 CTTC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Include., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: Nicola Baldo <nbaldo@cttc.es>
 *          Sébastien Deronne <sebastien.deronne@gmail.com>
 */
 
#include "radiotap-header.h"
 
#include "ns3/log.h"
 
#include <cmath>
#include <iomanip>
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("RadiotapHeader");
 
NS_OBJECT_ENSURE_REGISTERED(RadiotapHeader);
 
RadiotapHeader::RadiotapHeader()
    : m_length(8),
      m_present(0),
      m_tsft(0),
      m_flags(FRAME_FLAG_NONE),
      m_rate(0),
      m_channelFreq(0),
      m_channelFlags(CHANNEL_FLAG_NONE),
      m_antennaSignal(0),
      m_antennaNoise(0),
      m_ampduStatusRef(0),
      m_ampduStatusFlags(0),
      m_ampduStatusCRC(0),
      m_vhtPad(0),
      m_vhtKnown(0),
      m_vhtFlags(0),
      m_vhtBandwidth(0),
      m_vhtCoding(0),
      m_vhtGroupId(0),
      m_vhtPartialAid(0),
      m_hePad(0),
      m_heData1(0),
      m_heData2(0),
      m_heData3(0),
      m_heData4(0),
      m_heData5(0),
      m_heData6(0),
      m_heMuPad(0),
      m_heMuFlags1(0),
      m_heMuFlags2(0),
      m_heMuOtherUserPad(0),
      m_heMuPerUser1(0),
      m_heMuPerUser2(0),
      m_heMuPerUserPosition(0),
      m_heMuPerUserKnown(0)
{
    NS_LOG_FUNCTION(this);
}
 
TypeId
RadiotapHeader::GetTypeId()
{
    static TypeId tid = TypeId("ns3::RadiotapHeader")
                            .SetParent<Header>()
                            .SetGroupName("Network")
 
                            .AddConstructor<RadiotapHeader>();
    return tid;
}
 
TypeId
RadiotapHeader::GetInstanceTypeId() const
{
    return GetTypeId();
}
 
uint32_t
RadiotapHeader::GetSerializedSize() const
{
    NS_LOG_FUNCTION(this);
    return m_length;
}
 
void
RadiotapHeader::Serialize(Buffer::Iterator start) const
{
    NS_LOG_FUNCTION(this << &start);
 
    start.WriteU8(0);          // major version of radiotap header
    start.WriteU8(0);          // pad field
    start.WriteU16(m_length);  // entire length of radiotap data + header
    start.WriteU32(m_present); // bits describing which fields follow header
 
    //
    // Time Synchronization Function Timer (when the first bit of the MPDU
    // arrived at the MAC)
    // Reference: https://www.radiotap.org/fields/TSFT.html
    //
    if (m_present & RADIOTAP_TSFT) // bit 0
    {
        start.WriteU64(m_tsft);
    }
 
    //
    // Properties of transmitted and received frames.
    // Reference: https://www.radiotap.org/fields/Flags.html
    //
    if (m_present & RADIOTAP_FLAGS) // bit 1
    {
        start.WriteU8(m_flags);
    }
 
    //
    // TX/RX data rate in units of 500 kbps
    // Reference: https://www.radiotap.org/fields/Rate.html
    //
    if (m_present & RADIOTAP_RATE) // bit 2
    {
        start.WriteU8(m_rate);
    }
 
    //
    // Tx/Rx frequency in MHz, followed by flags.
    // Reference: https://www.radiotap.org/fields/Channel.html
    //
    if (m_present & RADIOTAP_CHANNEL) // bit 3
    {
        start.WriteU8(0, m_channelPad);
        start.WriteU16(m_channelFreq);
        start.WriteU16(m_channelFlags);
    }
 
    //
    // The hop set and pattern for frequency-hopping radios.  We don't need it but
    // still need to account for it.
    // Reference: https://www.radiotap.org/fields/FHSS.html
    //
    if (m_present & RADIOTAP_FHSS) // bit 4
    {
        start.WriteU8(0); // not yet implemented
    }
 
    //
    // RF signal power at the antenna, decibel difference from an arbitrary, fixed
    // reference.
    // Reference: https://www.radiotap.org/fields/Antenna%20signal.html
    //
    if (m_present & RADIOTAP_DBM_ANTSIGNAL) // bit 5
    {
        start.WriteU8(m_antennaSignal);
    }
 
    //
    // RF noise power at the antenna, decibel difference from an arbitrary, fixed
    // reference.
    // Reference: https://www.radiotap.org/fields/Antenna%20noise.html
    //
    if (m_present & RADIOTAP_DBM_ANTNOISE) // bit 6
    {
        start.WriteU8(m_antennaNoise);
    }
 
    //
    // Quality of Barker code lock.
    // Reference: https://www.radiotap.org/fields/Lock%20quality.html
    //
    if (m_present & RADIOTAP_LOCK_QUALITY) // bit 7
    {
        start.WriteU16(0); // not yet implemented
    }
 
    //
    // Transmit power expressed as unitless distance from max power
    // set at factory calibration (0 is max power).
    // Reference: https://www.radiotap.org/fields/TX%20attenuation.html
    //
    if (m_present & RADIOTAP_TX_ATTENUATION) // bit 8
    {
        start.WriteU16(0); // not yet implemented
    }
 
    //
    // Transmit power expressed as decibel distance from max power
    // set at factory calibration (0 is max power).
    // Reference: https://www.radiotap.org/fields/dB%20TX%20attenuation.html
    //
    if (m_present & RADIOTAP_DB_TX_ATTENUATION) // bit 9
    {
        start.WriteU16(0); // not yet implemented
    }
 
    //
    // Transmit power expressed as dBm (decibels from a 1 milliwatt reference).
    // This is the absolute power level measured at the antenna port.
    // Reference: https://www.radiotap.org/fields/dBm%20TX%20power.html
    //
    if (m_present & RADIOTAP_DBM_TX_POWER) // bit 10
    {
        start.WriteU8(0); // not yet implemented
    }
 
    //
    // Unitless indication of the Rx/Tx antenna for this packet.
    // The first antenna is antenna 0.
    // Reference: https://www.radiotap.org/fields/Antenna.html
    //
    if (m_present & RADIOTAP_ANTENNA) // bit 11
    {
        start.WriteU8(0); // not yet implemented
    }
 
    //
    // RF signal power at the antenna (decibel difference from an arbitrary fixed reference).
    // Reference: https://www.radiotap.org/fields/dB%20antenna%20signal.html
    //
    if (m_present & RADIOTAP_DB_ANTSIGNAL) // bit 12
    {
        start.WriteU8(0); // not yet implemented
    }
 
    //
    // RF noise power at the antenna (decibel difference from an arbitrary fixed reference).
    // Reference: https://www.radiotap.org/fields/dB%20antenna%20noise.html
    //
    if (m_present & RADIOTAP_DB_ANTNOISE) // bit 13
    {
        start.WriteU8(0); // not yet implemented
    }
 
    //
    // Properties of received frames.
    // Reference: https://www.radiotap.org/fields/RX%20flags.html
    //
    if (m_present & RADIOTAP_RX_FLAGS) // bit 14
    {
        start.WriteU16(0); // not yet implemented
    }
 
    //
    // MCS field.
    // Reference: https://www.radiotap.org/fields/MCS.html
    //
    if (m_present & RADIOTAP_MCS) // bit 19
    {
        start.WriteU8(m_mcsKnown);
        start.WriteU8(m_mcsFlags);
        start.WriteU8(m_mcsRate);
    }
 
    //
    // A-MPDU Status, information about the received or transmitted A-MPDU.
    // Reference: https://www.radiotap.org/fields/A-MPDU%20status.html
    //
    if (m_present & RADIOTAP_AMPDU_STATUS) // bit 20
    {
        start.WriteU8(0, m_ampduStatusPad);
        start.WriteU32(m_ampduStatusRef);
        start.WriteU16(m_ampduStatusFlags);
        start.WriteU8(m_ampduStatusCRC);
        start.WriteU8(0);
    }
 
    //
    // Information about the received or transmitted VHT frame.
    // Reference: https://www.radiotap.org/fields/VHT.html
    //
    if (m_present & RADIOTAP_VHT) // bit 21
    {
        start.WriteU8(0, m_vhtPad);
        start.WriteU16(m_vhtKnown);
        start.WriteU8(m_vhtFlags);
        start.WriteU8(m_vhtBandwidth);
        for (uint8_t i = 0; i < 4; i++)
        {
            start.WriteU8(m_vhtMcsNss[i]);
        }
        start.WriteU8(m_vhtCoding);
        start.WriteU8(m_vhtGroupId);
        start.WriteU16(m_vhtPartialAid);
    }
 
    //
    // HE field.
    // Reference: https://www.radiotap.org/fields/HE.html
    //
    if (m_present & RADIOTAP_HE) // bit 23
    {
        start.WriteU8(0, m_hePad);
        start.WriteU16(m_heData1);
        start.WriteU16(m_heData2);
        start.WriteU16(m_heData3);
        start.WriteU16(m_heData4);
        start.WriteU16(m_heData5);
        start.WriteU16(m_heData6);
    }
 
    //
    // HE MU field.
    // Reference: https://www.radiotap.org/fields/HE-MU.html
    //
    if (m_present & RADIOTAP_HE_MU) // bit 24
    {
        start.WriteU8(0, m_heMuPad);
        start.WriteU16(m_heMuFlags1);
        start.WriteU16(m_heMuFlags2);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
        start.WriteU8(0);
    }
 
    //
    // HE MU other user field.
    // Reference: https://www.radiotap.org/fields/HE-MU-other-user.html
    //
    if (m_present & RADIOTAP_HE_MU_OTHER_USER) // bit 25
    {
        start.WriteU8(0, m_heMuOtherUserPad);
        start.WriteU16(m_heMuPerUser1);
        start.WriteU16(m_heMuPerUser2);
        start.WriteU8(m_heMuPerUserPosition);
        start.WriteU8(m_heMuPerUserKnown);
    }
}
 
uint32_t
RadiotapHeader::Deserialize(Buffer::Iterator start)
{
    NS_LOG_FUNCTION(this << &start);
 
    uint8_t tmp = start.ReadU8(); // major version of radiotap header
    NS_ASSERT_MSG(tmp == 0x00, "RadiotapHeader::Deserialize(): Unexpected major version");
    start.ReadU8(); // pad field
 
    m_length = start.ReadU16();  // entire length of radiotap data + header
    m_present = start.ReadU32(); // bits describing which fields follow header
 
    uint32_t bytesRead = 8;
 
    //
    // Time Synchronization Function Timer (when the first bit of the MPDU arrived at the MAC)
    // Reference: https://www.radiotap.org/fields/TSFT.html
    //
    if (m_present & RADIOTAP_TSFT) // bit 0
    {
        m_tsft = start.ReadU64();
        bytesRead += 8;
    }
 
    //
    // Properties of transmitted and received frames.
    // Reference: https://www.radiotap.org/fields/Flags.html
    //
    if (m_present & RADIOTAP_FLAGS) // bit 1
    {
        m_flags = start.ReadU8();
        ++bytesRead;
    }
 
    //
    // TX/RX data rate in units of 500 kbps
    // Reference: https://www.radiotap.org/fields/Rate.html
    //
    if (m_present & RADIOTAP_RATE) // bit 2
    {
        m_rate = start.ReadU8();
        ++bytesRead;
    }
 
    //
    // Tx/Rx frequency in MHz, followed by flags.
    // Reference: https://www.radiotap.org/fields/Channel.html
    //
    if (m_present & RADIOTAP_CHANNEL) // bit 3
    {
        m_channelPad = ((2 - bytesRead % 2) % 2);
        start.Next(m_channelPad);
        m_channelFreq = start.ReadU16();
        m_channelFlags = start.ReadU16();
        bytesRead += (4 + m_channelPad);
    }
 
    //
    // The hop set and pattern for frequency-hopping radios.  We don't need it but
    // still need to account for it.
    // Reference: https://www.radiotap.org/fields/FHSS.html
    //
    if (m_present & RADIOTAP_FHSS) // bit 4
    {
        // not yet implemented
        start.ReadU8();
        ++bytesRead;
    }
 
    //
    // RF signal power at the antenna, decibel difference from an arbitrary, fixed
    // reference.
    // Reference: https://www.radiotap.org/fields/Antenna%20signal.html
    //
    if (m_present & RADIOTAP_DBM_ANTSIGNAL) // bit 5
    {
        m_antennaSignal = start.ReadU8();
        ++bytesRead;
    }
 
    //
    // RF noise power at the antenna, decibel difference from an arbitrary, fixed
    // reference.
    // Reference: https://www.radiotap.org/fields/Antenna%20noise.html
    //
    if (m_present & RADIOTAP_DBM_ANTNOISE) // bit 6
    {
        m_antennaNoise = start.ReadU8();
        ++bytesRead;
    }
 
    //
    // Quality of Barker code lock.
    // Reference: https://www.radiotap.org/fields/Lock%20quality.html
    //
    if (m_present & RADIOTAP_LOCK_QUALITY) // bit 7
    {
        // not yet implemented
        start.ReadU16();
        bytesRead += 2;
    }
 
    //
    // Transmit power expressed as unitless distance from max power
    // set at factory calibration (0 is max power).
    // Reference: https://www.radiotap.org/fields/TX%20attenuation.html
    //
    if (m_present & RADIOTAP_TX_ATTENUATION) // bit 8
    {
        // not yet implemented
        start.ReadU16();
        bytesRead += 2;
    }
 
    //
    // Transmit power expressed as decibel distance from max power
    // set at factory calibration (0 is max power).
    // Reference: https://www.radiotap.org/fields/dB%20TX%20attenuation.html
    //
    if (m_present & RADIOTAP_DB_TX_ATTENUATION) // bit 9
    {
        // not yet implemented
        start.ReadU16();
        bytesRead += 2;
    }
 
    //
    // Transmit power expressed as dBm (decibels from a 1 milliwatt reference).
    // This is the absolute power level measured at the antenna port.
    // Reference: https://www.radiotap.org/fields/dBm%20TX%20power.html
    //
    if (m_present & RADIOTAP_DBM_TX_POWER) // bit 10
    {
        // not yet implemented
        start.ReadU8();
        ++bytesRead;
    }
 
    //
    // Unitless indication of the Rx/Tx antenna for this packet.
    // The first antenna is antenna 0.
    // Reference: https://www.radiotap.org/fields/Antenna.html
    //
    if (m_present & RADIOTAP_ANTENNA) // bit 11
    {
        // not yet implemented
        start.ReadU8();
        ++bytesRead;
    }
 
    //
    // RF signal power at the antenna (decibel difference from an arbitrary fixed reference).
    // Reference: https://www.radiotap.org/fields/dB%20antenna%20signal.html
    //
    if (m_present & RADIOTAP_DB_ANTSIGNAL) // bit 12
    {
        // not yet implemented
        start.ReadU8();
        ++bytesRead;
    }
 
    //
    // RF noise power at the antenna (decibel difference from an arbitrary fixed reference).
    // Reference: https://www.radiotap.org/fields/dB%20antenna%20noise.html
    //
    if (m_present & RADIOTAP_DB_ANTNOISE) // bit 13
    {
        // not yet implemented
        start.ReadU8();
        ++bytesRead;
    }
 
    //
    // Properties of received frames.
    // Reference: https://www.radiotap.org/fields/RX%20flags.html
    //
    if (m_present & RADIOTAP_RX_FLAGS) // bit 14
    {
        // not yet implemented
        start.ReadU16();
        bytesRead += 2;
    }
 
    //
    // MCS field.
    // Reference: https://www.radiotap.org/fields/MCS.html
    //
    if (m_present & RADIOTAP_MCS) // bit 19
    {
        m_mcsKnown = start.ReadU8();
        m_mcsFlags = start.ReadU8();
        m_mcsRate = start.ReadU8();
        bytesRead += 3;
    }
 
    //
    // A-MPDU Status, information about the received or transmitted A-MPDU.
    // Reference: https://www.radiotap.org/fields/A-MPDU%20status.html
    //
    if (m_present & RADIOTAP_AMPDU_STATUS) // bit 20
    {
        m_ampduStatusPad = ((4 - bytesRead % 4) % 4);
        start.Next(m_ampduStatusPad);
        m_ampduStatusRef = start.ReadU32();
        m_ampduStatusFlags = start.ReadU16();
        m_ampduStatusCRC = start.ReadU8();
        start.ReadU8();
        bytesRead += (8 + m_ampduStatusPad);
    }
 
    //
    // Information about the received or transmitted VHT frame.
    // Reference: https://www.radiotap.org/fields/VHT.html
    //
    if (m_present & RADIOTAP_VHT) // bit 21
    {
        m_vhtPad = ((2 - bytesRead % 2) % 2);
        start.Next(m_vhtPad);
        m_vhtKnown = start.ReadU16();
        m_vhtFlags = start.ReadU8();
        m_vhtBandwidth = start.ReadU8();
        for (uint8_t i = 0; i < 4; i++)
        {
            m_vhtMcsNss[i] = start.ReadU8();
        }
        m_vhtCoding = start.ReadU8();
        m_vhtGroupId = start.ReadU8();
        m_vhtPartialAid = start.ReadU16();
        bytesRead += (12 + m_vhtPad);
    }
 
    //
    // HE field.
    // Reference: https://www.radiotap.org/fields/HE.html
    //
    if (m_present & RADIOTAP_HE) // bit 23
    {
        m_hePad = ((2 - bytesRead % 2) % 2);
        start.Next(m_hePad);
        m_heData1 = start.ReadU16();
        m_heData2 = start.ReadU16();
        m_heData3 = start.ReadU16();
        m_heData4 = start.ReadU16();
        m_heData5 = start.ReadU16();
        m_heData6 = start.ReadU16();
        bytesRead += (12 + m_hePad);
    }
 
    //
    // HE MU field.
    // Reference: https://www.radiotap.org/fields/HE-MU.html
    //
    if (m_present & RADIOTAP_HE_MU) // bit 24
    {
        m_heMuPad = ((2 - bytesRead % 2) % 2);
        m_heMuFlags1 = start.ReadU16();
        m_heMuFlags2 = start.ReadU16();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        start.ReadU8();
        bytesRead += (12 + m_heMuPad);
    }
 
    //
    // HE MU other user field.
    // Reference: https://www.radiotap.org/fields/HE-MU-other-user.html
    //
    if (m_present & RADIOTAP_HE_MU_OTHER_USER) // bit 25
    {
        m_heMuOtherUserPad = ((2 - bytesRead % 2) % 2);
        m_heMuPerUser1 = start.ReadU16();
        m_heMuPerUser2 = start.ReadU16();
        m_heMuPerUserPosition = start.ReadU8();
        m_heMuPerUserKnown = start.ReadU8();
        bytesRead += (6 + m_heMuOtherUserPad);
    }
 
    NS_ASSERT_MSG(m_length == bytesRead,
                  "RadiotapHeader::Deserialize(): expected and actual lengths inconsistent");
    return bytesRead;
}
 
void
RadiotapHeader::Print(std::ostream& os) const
{
    NS_LOG_FUNCTION(this << &os);
    os << " tsft=" << m_tsft << " flags=" << std::hex << m_flags << std::dec << " rate=" << +m_rate
       << " freq=" << m_channelFreq << " chflags=" << std::hex << +m_channelFlags << std::dec
       << " signal=" << +m_antennaSignal << " noise=" << +m_antennaNoise
       << " mcsKnown=" << m_mcsKnown << " mcsFlags=" << m_mcsFlags << " mcsRate=" << m_mcsRate
       << " ampduStatusFlags=" << +m_ampduStatusFlags << " vhtKnown=" << m_vhtKnown
       << " vhtFlags=" << m_vhtFlags << " vhtBandwidth=" << m_vhtBandwidth
       << " vhtMcsNss for user 1=" << m_vhtMcsNss[0] << " vhtMcsNss for user 2=" << m_vhtMcsNss[1]
       << " vhtMcsNss for user 3=" << m_vhtMcsNss[2] << " vhtMcsNss for user 4=" << m_vhtMcsNss[3]
       << " vhtCoding=" << m_vhtCoding << " vhtGroupId=" << m_vhtGroupId
       << " vhtPartialAid=" << m_vhtPartialAid << " heData1=" << m_heData1
       << " heData2=" << m_heData2 << " heData3=" << m_heData3 << " heData4=" << m_heData4
       << " heData5=" << m_heData5 << " heData6=" << m_heData6 << " heMuFlags1=" << m_heMuFlags1
       << " heMuFlags2=" << m_heMuFlags2 << " heMuPerUser1=" << m_heMuPerUser1
       << " heMuPerUser2=" << m_heMuPerUser2 << " heMuPerUserPosition=" << +m_heMuPerUserPosition
       << " heMuPerUserKnown=" << +m_heMuPerUserKnown;
}
 
void
RadiotapHeader::SetTsft(uint64_t value)
{
    NS_LOG_FUNCTION(this << value);
    m_tsft = value;
 
    if (!(m_present & RADIOTAP_TSFT))
    {
        m_present |= RADIOTAP_TSFT;
        m_length += 8;
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetFrameFlags(uint8_t flags)
{
    NS_LOG_FUNCTION(this << +flags);
    m_flags = flags;
 
    if (!(m_present & RADIOTAP_FLAGS))
    {
        m_present |= RADIOTAP_FLAGS;
        m_length += 1;
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetRate(uint8_t rate)
{
    NS_LOG_FUNCTION(this << +rate);
    m_rate = rate;
 
    if (!(m_present & RADIOTAP_RATE))
    {
        m_present |= RADIOTAP_RATE;
        m_length += 1;
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetChannelFrequencyAndFlags(uint16_t frequency, uint16_t flags)
{
    NS_LOG_FUNCTION(this << frequency << flags);
    m_channelFreq = frequency;
    m_channelFlags = flags;
 
    if (!(m_present & RADIOTAP_CHANNEL))
    {
        m_channelPad = ((2 - m_length % 2) % 2);
        m_present |= RADIOTAP_CHANNEL;
        m_length += (4 + m_channelPad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetAntennaSignalPower(double signal)
{
    NS_LOG_FUNCTION(this << signal);
 
    if (!(m_present & RADIOTAP_DBM_ANTSIGNAL))
    {
        m_present |= RADIOTAP_DBM_ANTSIGNAL;
        m_length += 1;
    }
    if (signal > 127)
    {
        m_antennaSignal = 127;
    }
    else if (signal < -128)
    {
        m_antennaSignal = -128;
    }
    else
    {
        m_antennaSignal = static_cast<int8_t>(floor(signal + 0.5));
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetAntennaNoisePower(double noise)
{
    NS_LOG_FUNCTION(this << noise);
 
    if (!(m_present & RADIOTAP_DBM_ANTNOISE))
    {
        m_present |= RADIOTAP_DBM_ANTNOISE;
        m_length += 1;
    }
    if (noise > 127.0)
    {
        m_antennaNoise = 127;
    }
    else if (noise < -128.0)
    {
        m_antennaNoise = -128;
    }
    else
    {
        m_antennaNoise = static_cast<int8_t>(floor(noise + 0.5));
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetMcsFields(uint8_t known, uint8_t flags, uint8_t mcs)
{
    NS_LOG_FUNCTION(this << known << +flags << +mcs);
    m_mcsKnown = known;
    m_mcsFlags = flags;
    m_mcsRate = mcs;
    if (!(m_present & RADIOTAP_MCS))
    {
        m_present |= RADIOTAP_MCS;
        m_length += 3;
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetAmpduStatus(uint32_t referenceNumber, uint16_t flags, uint8_t crc)
{
    NS_LOG_FUNCTION(this << referenceNumber << flags);
    m_ampduStatusRef = referenceNumber;
    m_ampduStatusFlags = flags;
    m_ampduStatusCRC = crc;
    if (!(m_present & RADIOTAP_AMPDU_STATUS))
    {
        m_ampduStatusPad = ((4 - m_length % 4) % 4);
        m_present |= RADIOTAP_AMPDU_STATUS;
        m_length += (8 + m_ampduStatusPad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetVhtFields(uint16_t known,
                             uint8_t flags,
                             uint8_t bandwidth,
                             uint8_t mcs_nss[4],
                             uint8_t coding,
                             uint8_t group_id,
                             uint16_t partial_aid)
{
    NS_LOG_FUNCTION(this << known << flags << +mcs_nss[0] << +mcs_nss[1] << +mcs_nss[2]
                         << +mcs_nss[3] << +coding << +group_id << +partial_aid);
    m_vhtKnown = known;
    m_vhtFlags = flags;
    m_vhtBandwidth = bandwidth;
    for (uint8_t i = 0; i < 4; i++)
    {
        m_vhtMcsNss[i] = mcs_nss[i];
    }
    m_vhtCoding = coding;
    m_vhtGroupId = group_id;
    m_vhtPartialAid = partial_aid;
    if (!(m_present & RADIOTAP_VHT))
    {
        m_vhtPad = ((2 - m_length % 2) % 2);
        m_present |= RADIOTAP_VHT;
        m_length += (12 + m_vhtPad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetHeFields(uint16_t data1,
                            uint16_t data2,
                            uint16_t data3,
                            uint16_t data4,
                            uint16_t data5,
                            uint16_t data6)
{
    NS_LOG_FUNCTION(this << data1 << data2 << data3 << data4 << data5 << data6);
    m_heData1 = data1;
    m_heData2 = data2;
    m_heData3 = data3;
    m_heData4 = data4;
    m_heData5 = data5;
    m_heData6 = data6;
    if (!(m_present & RADIOTAP_HE))
    {
        m_hePad = ((2 - m_length % 2) % 2);
        m_present |= RADIOTAP_HE;
        m_length += (12 + m_hePad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetHeMuFields(uint16_t flags1,
                              uint16_t flags2,
                              const std::array<uint8_t, 4>& /*ruChannel1*/,
                              const std::array<uint8_t, 4>& /*ruChannel2*/)
{
    NS_LOG_FUNCTION(this << flags1 << flags2);
    m_heMuFlags1 = flags1;
    m_heMuFlags2 = flags2;
    if (!(m_present & RADIOTAP_HE_MU))
    {
        m_heMuPad = ((2 - m_length % 2) % 2);
        m_present |= RADIOTAP_HE_MU;
        m_length += (12 + m_heMuPad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
void
RadiotapHeader::SetHeMuPerUserFields(uint16_t perUser1,
                                     uint16_t perUser2,
                                     uint8_t perUserPosition,
                                     uint8_t perUserKnown)
{
    NS_LOG_FUNCTION(this << perUser1 << perUser2 << +perUserPosition << +perUserKnown);
    m_heMuPerUser1 = perUser1;
    m_heMuPerUser2 = perUser2;
    m_heMuPerUserPosition = perUserPosition;
    m_heMuPerUserKnown = perUserKnown;
    if (!(m_present & RADIOTAP_HE_MU_OTHER_USER))
    {
        m_heMuOtherUserPad = ((2 - m_length % 2) % 2);
        m_present |= RADIOTAP_HE_MU_OTHER_USER;
        m_length += (6 + m_heMuOtherUserPad);
    }
 
    NS_LOG_LOGIC(this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present
                      << std::dec);
}
 
} // namespace ns3