/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file includes definitions for generating and processing IEEE 802.15.4 MAC frames.
 */

#ifndef MAC_FRAME_HPP_
#define MAC_FRAME_HPP_

#include "openthread-core-config.h"

#include <limits.h>
#include <stdint.h>

#include "common/as_core_type.hpp"
#include "common/const_cast.hpp"
#include "common/encoding.hpp"
#include "mac/mac_types.hpp"

namespace ot {
namespace Mac {

using ot::Encoding::LittleEndian::HostSwap16;
using ot::Encoding::LittleEndian::HostSwap64;
using ot::Encoding::LittleEndian::ReadUint24;
using ot::Encoding::LittleEndian::WriteUint24;

/**
 * @addtogroup core-mac
 *
 * @{
 *
 */

/**
 * This class implements IEEE 802.15.4 IE (Information Element) header generation and parsing.
 *
 */
OT_TOOL_PACKED_BEGIN
class HeaderIe
{
public:
    /**
     * This method initializes the Header IE.
     *
     */
    void Init(void) { mFields.m16 = 0; }

    /**
     * This method initializes the Header IE with Id and Length.
     *
     * @param[in]  aId   The IE Element Id.
     * @param[in]  aLen  The IE content length.
     *
     */
    void Init(uint16_t aId, uint8_t aLen);

    /**
     * This method returns the IE Element Id.
     *
     * @returns the IE Element Id.
     *
     */
    uint16_t GetId(void) const { return (HostSwap16(mFields.m16) & kIdMask) >> kIdOffset; }

    /**
     * This method sets the IE Element Id.
     *
     * @param[in]  aId  The IE Element Id.
     *
     */
    void SetId(uint16_t aId)
    {
        mFields.m16 = HostSwap16((HostSwap16(mFields.m16) & ~kIdMask) | ((aId << kIdOffset) & kIdMask));
    }

    /**
     * This method returns the IE content length.
     *
     * @returns the IE content length.
     *
     */
    uint8_t GetLength(void) const { return mFields.m8[0] & kLengthMask; }

    /**
     * This method sets the IE content length.
     *
     * @param[in]  aLength  The IE content length.
     *
     */
    void SetLength(uint8_t aLength) { mFields.m8[0] = (mFields.m8[0] & ~kLengthMask) | (aLength & kLengthMask); }

private:
    // Header IE format:
    //
    // +-----------+------------+--------+
    // | Bits: 0-6 |    7-14    |   15   |
    // +-----------+------------+--------+
    // | Length    | Element ID | Type=0 |
    // +-----------+------------+--------+

    static constexpr uint8_t  kSize       = 2;
    static constexpr uint8_t  kIdOffset   = 7;
    static constexpr uint8_t  kLengthMask = 0x7f;
    static constexpr uint16_t kIdMask     = 0x00ff << kIdOffset;

    union OT_TOOL_PACKED_FIELD
    {
        uint8_t  m8[kSize];
        uint16_t m16;
    } mFields;

} OT_TOOL_PACKED_END;

#if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE || OPENTHREAD_CONFIG_MLE_LINK_METRICS_INITIATOR_ENABLE || \
    OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
/**
 * This class implements vendor specific Header IE generation and parsing.
 *
 */
OT_TOOL_PACKED_BEGIN
class VendorIeHeader
{
public:
    static constexpr uint8_t kHeaderIeId    = 0x00;
    static constexpr uint8_t kIeContentSize = sizeof(uint8_t) * 4;

    /**
     * This method returns the Vendor OUI.
     *
     * @returns The Vendor OUI.
     *
     */
    uint32_t GetVendorOui(void) const { return ReadUint24(mOui); }

    /**
     * This method sets the Vendor OUI.
     *
     * @param[in]  aVendorOui  A Vendor OUI.
     *
     */
    void SetVendorOui(uint32_t aVendorOui) { WriteUint24(aVendorOui, mOui); }

    /**
     * This method returns the Vendor IE sub-type.
     *
     * @returns The Vendor IE sub-type.
     *
     */
    uint8_t GetSubType(void) const { return mSubType; }

    /**
     * This method sets the Vendor IE sub-type.
     *
     * @param[in]  aSubType  The Vendor IE sub-type.
     *
     */
    void SetSubType(uint8_t aSubType) { mSubType = aSubType; }

private:
    static constexpr uint8_t kOuiSize = 3;

    uint8_t mOui[kOuiSize];
    uint8_t mSubType;
} OT_TOOL_PACKED_END;

#if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
/**
 * This class implements Time Header IE generation and parsing.
 *
 */
OT_TOOL_PACKED_BEGIN
class TimeIe : public VendorIeHeader
{
public:
    static constexpr uint32_t kVendorOuiNest = 0x18b430;
    static constexpr uint8_t  kVendorIeTime  = 0x01;
    static constexpr uint8_t  kHeaderIeId    = VendorIeHeader::kHeaderIeId;
    static constexpr uint8_t  kIeContentSize = VendorIeHeader::kIeContentSize + sizeof(uint8_t) + sizeof(uint64_t);

    /**
     * This method initializes the time IE.
     *
     */
    void Init(void)
    {
        SetVendorOui(kVendorOuiNest);
        SetSubType(kVendorIeTime);
    }

    /**
     * This method returns the time sync sequence.
     *
     * @returns the time sync sequence.
     *
     */
    uint8_t GetSequence(void) const { return mSequence; }

    /**
     * This method sets the tine sync sequence.
     *
     * @param[in]  aSequence The time sync sequence.
     *
     */
    void SetSequence(uint8_t aSequence) { mSequence = aSequence; }

    /**
     * This method returns the network time.
     *
     * @returns the network time, in microseconds.
     *
     */
    uint64_t GetTime(void) const { return HostSwap64(mTime); }

    /**
     * This method sets the network time.
     *
     * @param[in]  aTime  The network time.
     *
     */
    void SetTime(uint64_t aTime) { mTime = HostSwap64(aTime); }

private:
    uint8_t  mSequence;
    uint64_t mTime;
} OT_TOOL_PACKED_END;
#endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE

#if OPENTHREAD_CONFIG_MLE_LINK_METRICS_INITIATOR_ENABLE || OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
class ThreadIe
{
public:
    static constexpr uint8_t  kHeaderIeId               = VendorIeHeader::kHeaderIeId;
    static constexpr uint8_t  kIeContentSize            = VendorIeHeader::kIeContentSize;
    static constexpr uint32_t kVendorOuiThreadCompanyId = 0xeab89b;
    static constexpr uint8_t  kEnhAckProbingIe          = 0x00;
};
#endif

#endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE || OPENTHREAD_CONFIG_MLE_LINK_METRICS_INITIATOR_ENABLE ||
       // OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE

/**
 * This class implements IEEE 802.15.4 MAC frame generation and parsing.
 *
 */
class Frame : public otRadioFrame
{
public:
    static constexpr uint8_t kFcfSize             = sizeof(uint16_t);
    static constexpr uint8_t kDsnSize             = sizeof(uint8_t);
    static constexpr uint8_t kSecurityControlSize = sizeof(uint8_t);
    static constexpr uint8_t kFrameCounterSize    = sizeof(uint32_t);
    static constexpr uint8_t kCommandIdSize       = sizeof(uint8_t);
    static constexpr uint8_t k154FcsSize          = sizeof(uint16_t);

    static constexpr uint16_t kFcfFrameBeacon      = 0 << 0;
    static constexpr uint16_t kFcfFrameData        = 1 << 0;
    static constexpr uint16_t kFcfFrameAck         = 2 << 0;
    static constexpr uint16_t kFcfFrameMacCmd      = 3 << 0;
    static constexpr uint16_t kFcfFrameTypeMask    = 7 << 0;
    static constexpr uint16_t kFcfSecurityEnabled  = 1 << 3;
    static constexpr uint16_t kFcfFramePending     = 1 << 4;
    static constexpr uint16_t kFcfAckRequest       = 1 << 5;
    static constexpr uint16_t kFcfPanidCompression = 1 << 6;
    static constexpr uint16_t kFcfIePresent        = 1 << 9;
    static constexpr uint16_t kFcfDstAddrNone      = 0 << 10;
    static constexpr uint16_t kFcfDstAddrShort     = 2 << 10;
    static constexpr uint16_t kFcfDstAddrExt       = 3 << 10;
    static constexpr uint16_t kFcfDstAddrMask      = 3 << 10;
    static constexpr uint16_t kFcfFrameVersion2006 = 1 << 12;
    static constexpr uint16_t kFcfFrameVersion2015 = 2 << 12;
    static constexpr uint16_t kFcfFrameVersionMask = 3 << 12;
    static constexpr uint16_t kFcfSrcAddrNone      = 0 << 14;
    static constexpr uint16_t kFcfSrcAddrShort     = 2 << 14;
    static constexpr uint16_t kFcfSrcAddrExt       = 3 << 14;
    static constexpr uint16_t kFcfSrcAddrMask      = 3 << 14;

    static constexpr uint8_t kSecNone      = 0 << 0;
    static constexpr uint8_t kSecMic32     = 1 << 0;
    static constexpr uint8_t kSecMic64     = 2 << 0;
    static constexpr uint8_t kSecMic128    = 3 << 0;
    static constexpr uint8_t kSecEnc       = 4 << 0;
    static constexpr uint8_t kSecEncMic32  = 5 << 0;
    static constexpr uint8_t kSecEncMic64  = 6 << 0;
    static constexpr uint8_t kSecEncMic128 = 7 << 0;
    static constexpr uint8_t kSecLevelMask = 7 << 0;

    static constexpr uint8_t kMic0Size   = 0;
    static constexpr uint8_t kMic32Size  = 32 / CHAR_BIT;
    static constexpr uint8_t kMic64Size  = 64 / CHAR_BIT;
    static constexpr uint8_t kMic128Size = 128 / CHAR_BIT;
    static constexpr uint8_t kMaxMicSize = kMic128Size;

    static constexpr uint8_t kKeyIdMode0    = 0 << 3;
    static constexpr uint8_t kKeyIdMode1    = 1 << 3;
    static constexpr uint8_t kKeyIdMode2    = 2 << 3;
    static constexpr uint8_t kKeyIdMode3    = 3 << 3;
    static constexpr uint8_t kKeyIdModeMask = 3 << 3;

    static constexpr uint8_t kKeySourceSizeMode0 = 0;
    static constexpr uint8_t kKeySourceSizeMode1 = 0;
    static constexpr uint8_t kKeySourceSizeMode2 = 4;
    static constexpr uint8_t kKeySourceSizeMode3 = 8;

    static constexpr uint8_t kKeyIndexSize = sizeof(uint8_t);

    static constexpr uint8_t kMacCmdAssociationRequest         = 1;
    static constexpr uint8_t kMacCmdAssociationResponse        = 2;
    static constexpr uint8_t kMacCmdDisassociationNotification = 3;
    static constexpr uint8_t kMacCmdDataRequest                = 4;
    static constexpr uint8_t kMacCmdPanidConflictNotification  = 5;
    static constexpr uint8_t kMacCmdOrphanNotification         = 6;
    static constexpr uint8_t kMacCmdBeaconRequest              = 7;
    static constexpr uint8_t kMacCmdCoordinatorRealignment     = 8;
    static constexpr uint8_t kMacCmdGtsRequest                 = 9;

    static constexpr uint8_t kImmAckLength = kFcfSize + kDsnSize + k154FcsSize;

    static constexpr uint16_t kInfoStringSize = 128; ///< Max chars for `InfoString` (ToInfoString()).

    /**
     * This type defines the fixed-length `String` object returned from `ToInfoString()` method.
     *
     */
    typedef String<kInfoStringSize> InfoString;

    /**
     * This method indicates whether the frame is empty (no payload).
     *
     * @retval TRUE   The frame is empty (no PSDU payload).
     * @retval FALSE  The frame is not empty.
     *
     */
    bool IsEmpty(void) const { return (mLength == 0); }

    /**
     * This method initializes the MAC header.
     *
     * @param[in]  aFcf              The Frame Control field.
     * @param[in]  aSecurityControl  The Security Control field.
     *
     */
    void InitMacHeader(uint16_t aFcf, uint8_t aSecurityControl);

    /**
     * This method validates the frame.
     *
     * @retval kErrorNone    Successfully parsed the MAC header.
     * @retval kErrorParse   Failed to parse through the MAC header.
     *
     */
    Error ValidatePsdu(void) const;

    /**
     * This method returns the IEEE 802.15.4 Frame Type.
     *
     * @returns The IEEE 802.15.4 Frame Type.
     *
     */
    uint8_t GetType(void) const { return GetPsdu()[0] & kFcfFrameTypeMask; }

    /**
     * This method returns whether the frame is an Ack frame.
     *
     * @retval TRUE   If this is an Ack.
     * @retval FALSE  If this is not an Ack.
     *
     */
    bool IsAck(void) const { return GetType() == kFcfFrameAck; }

    /**
     * This method returns the IEEE 802.15.4 Frame Version.
     *
     * @returns The IEEE 802.15.4 Frame Version.
     *
     */
    uint16_t GetVersion(void) const { return GetFrameControlField() & kFcfFrameVersionMask; }

    /**
     * This method returns if this IEEE 802.15.4 frame's version is 2015.
     *
     * @returns TRUE if version is 2015, FALSE otherwise.
     *
     */
    bool IsVersion2015(void) const { return IsVersion2015(GetFrameControlField()); }

    /**
     * This method indicates whether or not security is enabled.
     *
     * @retval TRUE   If security is enabled.
     * @retval FALSE  If security is not enabled.
     *
     */
    bool GetSecurityEnabled(void) const { return (GetPsdu()[0] & kFcfSecurityEnabled) != 0; }

    /**
     * This method indicates whether or not the Frame Pending bit is set.
     *
     * @retval TRUE   If the Frame Pending bit is set.
     * @retval FALSE  If the Frame Pending bit is not set.
     *
     */
    bool GetFramePending(void) const { return (GetPsdu()[0] & kFcfFramePending) != 0; }

    /**
     * This method sets the Frame Pending bit.
     *
     * @param[in]  aFramePending  The Frame Pending bit.
     *
     */
    void SetFramePending(bool aFramePending);

    /**
     * This method indicates whether or not the Ack Request bit is set.
     *
     * @retval TRUE   If the Ack Request bit is set.
     * @retval FALSE  If the Ack Request bit is not set.
     *
     */
    bool GetAckRequest(void) const { return (GetPsdu()[0] & kFcfAckRequest) != 0; }

    /**
     * This method sets the Ack Request bit.
     *
     * @param[in]  aAckRequest  The Ack Request bit.
     *
     */
    void SetAckRequest(bool aAckRequest);

    /**
     * This method indicates whether or not the PanId Compression bit is set.
     *
     * @retval TRUE   If the PanId Compression bit is set.
     * @retval FALSE  If the PanId Compression bit is not set.
     *
     */
    bool IsPanIdCompressed(void) const { return (GetFrameControlField() & kFcfPanidCompression) != 0; }

    /**
     * This method indicates whether or not IEs present.
     *
     * @retval TRUE   If IEs present.
     * @retval FALSE  If no IE present.
     *
     */
    bool IsIePresent(void) const { return (GetFrameControlField() & kFcfIePresent) != 0; }

    /**
     * This method returns the Sequence Number value.
     *
     * @returns The Sequence Number value.
     *
     */
    uint8_t GetSequence(void) const { return GetPsdu()[kSequenceIndex]; }

    /**
     * This method sets the Sequence Number value.
     *
     * @param[in]  aSequence  The Sequence Number value.
     *
     */
    void SetSequence(uint8_t aSequence) { GetPsdu()[kSequenceIndex] = aSequence; }

    /**
     * This method indicates whether or not the Destination PAN ID is present.
     *
     * @returns TRUE if the Destination PAN ID is present, FALSE otherwise.
     *
     */
    bool IsDstPanIdPresent(void) const { return IsDstPanIdPresent(GetFrameControlField()); }

    /**
     * This method gets the Destination PAN Identifier.
     *
     * @param[out]  aPanId  The Destination PAN Identifier.
     *
     * @retval kErrorNone   Successfully retrieved the Destination PAN Identifier.
     * @retval kErrorParse  Failed to parse the PAN Identifier.
     *
     */
    Error GetDstPanId(PanId &aPanId) const;

    /**
     * This method sets the Destination PAN Identifier.
     *
     * @param[in]  aPanId  The Destination PAN Identifier.
     *
     */
    void SetDstPanId(PanId aPanId);

    /**
     * This method indicates whether or not the Destination Address is present for this object.
     *
     * @retval TRUE   If the Destination Address is present.
     * @retval FALSE  If the Destination Address is not present.
     *
     */
    bool IsDstAddrPresent() const { return IsDstAddrPresent(GetFrameControlField()); }

    /**
     * This method gets the Destination Address.
     *
     * @param[out]  aAddress  The Destination Address.
     *
     * @retval kErrorNone  Successfully retrieved the Destination Address.
     *
     */
    Error GetDstAddr(Address &aAddress) const;

    /**
     * This method sets the Destination Address.
     *
     * @param[in]  aShortAddress  The Destination Address.
     *
     */
    void SetDstAddr(ShortAddress aShortAddress);

    /**
     * This method sets the Destination Address.
     *
     * @param[in]  aExtAddress  The Destination Address.
     *
     */
    void SetDstAddr(const ExtAddress &aExtAddress);

    /**
     * This method sets the Destination Address.
     *
     * @param[in]  aAddress  The Destination Address.
     *
     */
    void SetDstAddr(const Address &aAddress);

    /**
     * This method indicates whether or not the Source Address is present for this object.
     *
     * @retval TRUE   If the Source Address is present.
     * @retval FALSE  If the Source Address is not present.
     *
     */
    bool IsSrcPanIdPresent(void) const { return IsSrcPanIdPresent(GetFrameControlField()); }

    /**
     * This method gets the Source PAN Identifier.
     *
     * @param[out]  aPanId  The Source PAN Identifier.
     *
     * @retval kErrorNone   Successfully retrieved the Source PAN Identifier.
     *
     */
    Error GetSrcPanId(PanId &aPanId) const;

    /**
     * This method sets the Source PAN Identifier.
     *
     * @param[in]  aPanId  The Source PAN Identifier.
     *
     * @retval kErrorNone   Successfully set the Source PAN Identifier.
     *
     */
    Error SetSrcPanId(PanId aPanId);

    /**
     * This method indicates whether or not the Source Address is present for this object.
     *
     * @retval TRUE   If the Source Address is present.
     * @retval FALSE  If the Source Address is not present.
     *
     */
    bool IsSrcAddrPresent(void) const { return IsSrcAddrPresent(GetFrameControlField()); }

    /**
     * This method gets the Source Address.
     *
     * @param[out]  aAddress  The Source Address.
     *
     * @retval kErrorNone  Successfully retrieved the Source Address.
     *
     */
    Error GetSrcAddr(Address &aAddress) const;

    /**
     * This method sets the Source Address.
     *
     * @param[in]  aShortAddress  The Source Address.
     *
     */
    void SetSrcAddr(ShortAddress aShortAddress);

    /**
     * This method sets the Source Address.
     *
     * @param[in]  aExtAddress  The Source Address.
     *
     */
    void SetSrcAddr(const ExtAddress &aExtAddress);

    /**
     * This method sets the Source Address.
     *
     * @param[in]  aAddress  The Source Address.
     *
     */
    void SetSrcAddr(const Address &aAddress);

    /**
     * This method gets the Security Control Field.
     *
     * @param[out]  aSecurityControlField  The Security Control Field.
     *
     * @retval kErrorNone   Successfully retrieved the Security Level Identifier.
     * @retval kErrorParse  Failed to find the security control field in the frame.
     *
     */
    Error GetSecurityControlField(uint8_t &aSecurityControlField) const;

    /**
     * This method sets the Security Control Field.
     *
     * @param[in]  aSecurityControlField  The Security Control Field.
     *
     */
    void SetSecurityControlField(uint8_t aSecurityControlField);

    /**
     * This method gets the Security Level Identifier.
     *
     * @param[out]  aSecurityLevel  The Security Level Identifier.
     *
     * @retval kErrorNone  Successfully retrieved the Security Level Identifier.
     *
     */
    Error GetSecurityLevel(uint8_t &aSecurityLevel) const;

    /**
     * This method gets the Key Identifier Mode.
     *
     * @param[out]  aKeyIdMode  The Key Identifier Mode.
     *
     * @retval kErrorNone  Successfully retrieved the Key Identifier Mode.
     *
     */
    Error GetKeyIdMode(uint8_t &aKeyIdMode) const;

    /**
     * This method gets the Frame Counter.
     *
     * @param[out]  aFrameCounter  The Frame Counter.
     *
     * @retval kErrorNone  Successfully retrieved the Frame Counter.
     *
     */
    Error GetFrameCounter(uint32_t &aFrameCounter) const;

    /**
     * This method sets the Frame Counter.
     *
     * @param[in]  aFrameCounter  The Frame Counter.
     *
     */
    void SetFrameCounter(uint32_t aFrameCounter);

    /**
     * This method returns a pointer to the Key Source.
     *
     * @returns A pointer to the Key Source.
     *
     */
    const uint8_t *GetKeySource(void) const;

    /**
     * This method sets the Key Source.
     *
     * @param[in]  aKeySource  A pointer to the Key Source value.
     *
     */
    void SetKeySource(const uint8_t *aKeySource);

    /**
     * This method gets the Key Identifier.
     *
     * @param[out]  aKeyId  The Key Identifier.
     *
     * @retval kErrorNone  Successfully retrieved the Key Identifier.
     *
     */
    Error GetKeyId(uint8_t &aKeyId) const;

    /**
     * This method sets the Key Identifier.
     *
     * @param[in]  aKeyId  The Key Identifier.
     *
     */
    void SetKeyId(uint8_t aKeyId);

    /**
     * This method gets the Command ID.
     *
     * @param[out]  aCommandId  The Command ID.
     *
     * @retval kErrorNone  Successfully retrieved the Command ID.
     *
     */
    Error GetCommandId(uint8_t &aCommandId) const;

    /**
     * This method sets the Command ID.
     *
     * @param[in]  aCommandId  The Command ID.
     *
     * @retval kErrorNone  Successfully set the Command ID.
     *
     */
    Error SetCommandId(uint8_t aCommandId);

    /**
     * This method indicates whether the frame is a MAC Data Request command (data poll).
     *
     * For 802.15.4-2015 and above frame, the frame should be already decrypted.
     *
     * @returns TRUE if frame is a MAC Data Request command, FALSE otherwise.
     *
     */
    bool IsDataRequestCommand(void) const;

    /**
     * This method returns the MAC Frame Length.
     *
     * @returns The MAC Frame Length.
     *
     */
    uint16_t GetLength(void) const { return mLength; }

    /**
     * This method sets the MAC Frame Length.
     *
     * @param[in]  aLength  The MAC Frame Length.
     *
     */
    void SetLength(uint16_t aLength) { mLength = aLength; }

    /**
     * This method returns the MAC header size.
     *
     * @returns The MAC header size.
     *
     */
    uint8_t GetHeaderLength(void) const;

    /**
     * This method returns the MAC footer size.
     *
     * @returns The MAC footer size.
     *
     */
    uint8_t GetFooterLength(void) const;

    /**
     * This method returns the current MAC Payload length.
     *
     * @returns The current MAC Payload length.
     *
     */
    uint16_t GetPayloadLength(void) const;

    /**
     * This method returns the maximum MAC Payload length for the given MAC header and footer.
     *
     * @returns The maximum MAC Payload length for the given MAC header and footer.
     *
     */
    uint16_t GetMaxPayloadLength(void) const;

    /**
     * This method sets the MAC Payload length.
     *
     */
    void SetPayloadLength(uint16_t aLength);

    /**
     * This method returns the IEEE 802.15.4 channel used for transmission or reception.
     *
     * @returns The IEEE 802.15.4 channel used for transmission or reception.
     *
     */
    uint8_t GetChannel(void) const { return mChannel; }

    /**
     * This method sets the IEEE 802.15.4 channel used for transmission or reception.
     *
     * @param[in]  aChannel  The IEEE 802.15.4 channel used for transmission or reception.
     *
     */
    void SetChannel(uint8_t aChannel) { mChannel = aChannel; }

    /**
     * This method returns the IEEE 802.15.4 PSDU length.
     *
     * @returns The IEEE 802.15.4 PSDU length.
     *
     */
    uint16_t GetPsduLength(void) const { return mLength; }

    /**
     * This method returns a pointer to the PSDU.
     *
     * @returns A pointer to the PSDU.
     *
     */
    uint8_t *GetPsdu(void) { return mPsdu; }

    /**
     * This const method returns a pointer to the PSDU.
     *
     * @returns A pointer to the PSDU.
     *
     */
    const uint8_t *GetPsdu(void) const { return mPsdu; }

    /**
     * This method returns a pointer to the MAC Header.
     *
     * @returns A pointer to the MAC Header.
     *
     */
    uint8_t *GetHeader(void) { return GetPsdu(); }

    /**
     * This const method returns a pointer to the MAC Header.
     *
     * @returns A pointer to the MAC Header.
     *
     */
    const uint8_t *GetHeader(void) const { return GetPsdu(); }

    /**
     * This method returns a pointer to the MAC Payload.
     *
     * @returns A pointer to the MAC Payload.
     *
     */
    uint8_t *GetPayload(void) { return AsNonConst(AsConst(this)->GetPayload()); }

    /**
     * This const method returns a pointer to the MAC Payload.
     *
     * @returns A pointer to the MAC Payload.
     *
     */
    const uint8_t *GetPayload(void) const;

    /**
     * This method returns a pointer to the MAC Footer.
     *
     * @returns A pointer to the MAC Footer.
     *
     */
    uint8_t *GetFooter(void) { return AsNonConst(AsConst(this)->GetFooter()); }

    /**
     * This const method returns a pointer to the MAC Footer.
     *
     * @returns A pointer to the MAC Footer.
     *
     */
    const uint8_t *GetFooter(void) const;

#if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE

    /**
     * This method returns a pointer to the vendor specific Time IE.
     *
     * @returns A pointer to the Time IE, `nullptr` if not found.
     *
     */
    TimeIe *GetTimeIe(void) { return AsNonConst(AsConst(this)->GetTimeIe()); }

    /**
     * This method returns a pointer to the vendor specific Time IE.
     *
     * @returns A pointer to the Time IE, `nullptr` if not found.
     *
     */
    const TimeIe *GetTimeIe(void) const;
#endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE

#if OPENTHREAD_CONFIG_MAC_HEADER_IE_SUPPORT
    /**
     * This template method appends an Header IE at specified index in this frame.
     *
     * @param[in,out]   aIndex  The index to append IE. If `aIndex` is `0` on input, this method finds the index
     *                          for the first IE and appends the IE at that position. If the position is not found
     *                          successfully, `aIndex` will be set to `kInvalidIndex`. Otherwise the IE will be
     *                          appended at `aIndex` on input. And on output, `aIndex` will be set to the end of the
     *                          IE just appended.
     *
     * @tparam  IeType  The Header IE type, it MUST contain a constant `kHeaderIeId` equal to the IE's Id
     *                  and a constant `kIeContentSize` indicating the IE body's size.
     *
     * @retval kErrorNone      Successfully appended the Header IE.
     * @retval kErrorNotFound  The position for first IE is not found.
     *
     */
    template <typename IeType> Error AppendHeaderIeAt(uint8_t &aIndex);

    /**
     * This method returns a pointer to the Header IE.
     *
     * @param[in] aIeId  The Element Id of the Header IE.
     *
     * @returns A pointer to the Header IE, `nullptr` if not found.
     *
     */
    uint8_t *GetHeaderIe(uint8_t aIeId) { return AsNonConst(AsConst(this)->GetHeaderIe(aIeId)); }

    /**
     * This method returns a pointer to the Header IE.
     *
     * @param[in] aIeId  The Element Id of the Header IE.
     *
     * @returns A pointer to the Header IE, `nullptr` if not found.
     *
     */
    const uint8_t *GetHeaderIe(uint8_t aIeId) const;

    /**
     * This method returns a pointer to a specific Thread IE.
     *
     * A Thread IE is a vendor specific IE with Vendor OUI as `kVendorOuiThreadCompanyId`.
     *
     * @param[in] aSubType  The sub type of the Thread IE.
     *
     * @returns A pointer to the Thread IE, `nullptr` if not found.
     *
     */
    uint8_t *GetThreadIe(uint8_t aSubType) { return AsNonConst(AsConst(this)->GetThreadIe(aSubType)); }

    /**
     * This method returns a pointer to a specific Thread IE.
     *
     * A Thread IE is a vendor specific IE with Vendor OUI as `kVendorOuiThreadCompanyId`.
     *
     * @param[in] aSubType  The sub type of the Thread IE.
     *
     * @returns A pointer to the Thread IE, `nullptr` if not found.
     *
     */
    const uint8_t *GetThreadIe(uint8_t aSubType) const;

#if OPENTHREAD_CONFIG_MAC_CSL_RECEIVER_ENABLE
    /**
     * This method finds CSL IE in the frame and modify its content.
     *
     * @param[in] aCslPeriod  CSL Period in CSL IE.
     * @param[in] aCslPhase   CSL Phase in CSL IE.
     *
     */
    void SetCslIe(uint16_t aCslPeriod, uint16_t aCslPhase);
#endif // OPENTHREAD_CONFIG_MAC_CSL_RECEIVER_ENABLE

#if OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
    /**
     * This method finds Enhanced ACK Probing (Vendor Specific) IE and set its value.
     *
     * @param[in] aValue  A pointer to the value to set.
     * @param[in] aLen    The length of @p aValue.
     *
     */
    void SetEnhAckProbingIe(const uint8_t *aValue, uint8_t aLen);
#endif // OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE

#endif // OPENTHREAD_CONFIG_MAC_HEADER_IE_SUPPORT

#if OPENTHREAD_CONFIG_MULTI_RADIO
    /**
     * This method gets the radio link type of the frame.
     *
     * @returns Frame's radio link type.
     *
     */
    RadioType GetRadioType(void) const { return static_cast<RadioType>(mRadioType); }

    /**
     * This method sets the radio link type of the frame.
     *
     * @param[in] aRadioType  A radio link type.
     *
     */
    void SetRadioType(RadioType aRadioType) { mRadioType = static_cast<uint8_t>(aRadioType); }
#endif

    /**
     * This method returns the maximum transmission unit size (MTU).
     *
     * @returns The maximum transmission unit (MTU).
     *
     */
    uint16_t GetMtu(void) const
#if !OPENTHREAD_CONFIG_MULTI_RADIO && OPENTHREAD_CONFIG_RADIO_LINK_IEEE_802_15_4_ENABLE
    {
        return OT_RADIO_FRAME_MAX_SIZE;
    }
#else
        ;
#endif

    /**
     * This method returns the FCS size.
     *
     * @returns This method returns the FCS size.
     *
     */
    uint8_t GetFcsSize(void) const
#if !OPENTHREAD_CONFIG_MULTI_RADIO && OPENTHREAD_CONFIG_RADIO_LINK_IEEE_802_15_4_ENABLE
    {
        return k154FcsSize;
    }
#else
        ;
#endif

    /**
     * This method returns information about the frame object as an `InfoString` object.
     *
     * @returns An `InfoString` containing info about the frame.
     *
     */
    InfoString ToInfoString(void) const;

    /**
     * This method returns the Frame Control field of the frame.
     *
     * @returns The Frame Control field.
     *
     */
    uint16_t GetFrameControlField(void) const;

protected:
    static constexpr uint8_t kInvalidIndex  = 0xff;
    static constexpr uint8_t kInvalidSize   = kInvalidIndex;
    static constexpr uint8_t kMaxPsduSize   = kInvalidSize - 1;
    static constexpr uint8_t kSequenceIndex = kFcfSize;

    uint8_t FindDstPanIdIndex(void) const;
    uint8_t FindDstAddrIndex(void) const;
    uint8_t FindSrcPanIdIndex(void) const;
    uint8_t FindSrcAddrIndex(void) const;
    uint8_t SkipAddrFieldIndex(void) const;
    uint8_t FindSecurityHeaderIndex(void) const;
    uint8_t SkipSecurityHeaderIndex(void) const;
    uint8_t FindPayloadIndex(void) const;
#if OPENTHREAD_CONFIG_MAC_HEADER_IE_SUPPORT
    uint8_t FindHeaderIeIndex(void) const;

    Error                           InitIeHeaderAt(uint8_t &aIndex, uint8_t ieId, uint8_t ieContentSize);
    template <typename IeType> void InitIeContentAt(uint8_t &aIndex);
#endif

    static uint8_t GetKeySourceLength(uint8_t aKeyIdMode);

    static bool IsDstAddrPresent(uint16_t aFcf) { return (aFcf & kFcfDstAddrMask) != kFcfDstAddrNone; }
    static bool IsDstPanIdPresent(uint16_t aFcf);
    static bool IsSrcAddrPresent(uint16_t aFcf) { return (aFcf & kFcfSrcAddrMask) != kFcfSrcAddrNone; }
    static bool IsSrcPanIdPresent(uint16_t aFcf);
    static bool IsVersion2015(uint16_t aFcf) { return (aFcf & kFcfFrameVersionMask) == kFcfFrameVersion2015; }

    static uint8_t CalculateAddrFieldSize(uint16_t aFcf);
    static uint8_t CalculateSecurityHeaderSize(uint8_t aSecurityControl);
    static uint8_t CalculateMicSize(uint8_t aSecurityControl);
};

/**
 * This class supports received IEEE 802.15.4 MAC frame processing.
 *
 */
class RxFrame : public Frame
{
public:
    friend class TxFrame;

    /**
     * This method returns the RSSI in dBm used for reception.
     *
     * @returns The RSSI in dBm used for reception.
     *
     */
    int8_t GetRssi(void) const { return mInfo.mRxInfo.mRssi; }

    /**
     * This method sets the RSSI in dBm used for reception.
     *
     * @param[in]  aRssi  The RSSI in dBm used for reception.
     *
     */
    void SetRssi(int8_t aRssi) { mInfo.mRxInfo.mRssi = aRssi; }

    /**
     * This method returns the receive Link Quality Indicator.
     *
     * @returns The receive Link Quality Indicator.
     *
     */
    uint8_t GetLqi(void) const { return mInfo.mRxInfo.mLqi; }

    /**
     * This method sets the receive Link Quality Indicator.
     *
     * @param[in]  aLqi  The receive Link Quality Indicator.
     *
     */
    void SetLqi(uint8_t aLqi) { mInfo.mRxInfo.mLqi = aLqi; }

    /**
     * This method indicates whether or not the received frame is acknowledged with frame pending set.
     *
     * @retval TRUE   This frame is acknowledged with frame pending set.
     * @retval FALSE  This frame is acknowledged with frame pending not set.
     *
     */
    bool IsAckedWithFramePending(void) const { return mInfo.mRxInfo.mAckedWithFramePending; }

    /**
     * This method returns the timestamp when the frame was received.
     *
     * @returns The timestamp when the frame was received, in microseconds.
     *
     */
    const uint64_t &GetTimestamp(void) const { return mInfo.mRxInfo.mTimestamp; }

    /**
     * This method performs AES CCM on the frame which is received.
     *
     * @param[in]  aExtAddress  A reference to the extended address, which will be used to generate nonce
     *                          for AES CCM computation.
     * @param[in]  aMacKey      A reference to the MAC key to decrypt the received frame.
     *
     * @retval kErrorNone      Process of received frame AES CCM succeeded.
     * @retval kErrorSecurity  Received frame MIC check failed.
     *
     */
    Error ProcessReceiveAesCcm(const ExtAddress &aExtAddress, const KeyMaterial &aMacKey);

#if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
    /**
     * This method gets the offset to network time.
     *
     * @returns  The offset to network time.
     *
     */
    int64_t ComputeNetworkTimeOffset(void) const
    {
        return static_cast<int64_t>(GetTimeIe()->GetTime() - GetTimestamp());
    }

    /**
     * This method gets the time sync sequence.
     *
     * @returns  The time sync sequence.
     *
     */
    uint8_t ReadTimeSyncSeq(void) const { return GetTimeIe()->GetSequence(); }
#endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
};

/**
 * This class supports IEEE 802.15.4 MAC frame generation for transmission.
 *
 */
class TxFrame : public Frame
{
public:
    /**
     * This method returns the maximum number of backoffs the CSMA-CA algorithm will attempt before declaring a channel
     * access failure.
     *
     * Equivalent to macMaxCSMABackoffs in IEEE 802.15.4-2006.
     *
     * @returns The maximum number of backoffs the CSMA-CA algorithm will attempt before declaring a channel access
     *          failure.
     *
     */
    uint8_t GetMaxCsmaBackoffs(void) const { return mInfo.mTxInfo.mMaxCsmaBackoffs; }

    /**
     * This method sets the maximum number of backoffs the CSMA-CA algorithm will attempt before declaring a channel
     * access failure.
     *
     * Equivalent to macMaxCSMABackoffs in IEEE 802.15.4-2006.
     *
     * @param[in]  aMaxCsmaBackoffs  The maximum number of backoffs the CSMA-CA algorithm will attempt before declaring
     *                               a channel access failure.
     *
     */
    void SetMaxCsmaBackoffs(uint8_t aMaxCsmaBackoffs) { mInfo.mTxInfo.mMaxCsmaBackoffs = aMaxCsmaBackoffs; }

    /**
     * This method returns the maximum number of retries allowed after a transmission failure.
     *
     * Equivalent to macMaxFrameRetries in IEEE 802.15.4-2006.
     *
     * @returns The maximum number of retries allowed after a transmission failure.
     *
     */
    uint8_t GetMaxFrameRetries(void) const { return mInfo.mTxInfo.mMaxFrameRetries; }

    /**
     * This method sets the maximum number of retries allowed after a transmission failure.
     *
     * Equivalent to macMaxFrameRetries in IEEE 802.15.4-2006.
     *
     * @param[in]  aMaxFrameRetries  The maximum number of retries allowed after a transmission failure.
     *
     */
    void SetMaxFrameRetries(uint8_t aMaxFrameRetries) { mInfo.mTxInfo.mMaxFrameRetries = aMaxFrameRetries; }

    /**
     * This method indicates whether or not the frame is a retransmission.
     *
     * @retval TRUE   Frame is a retransmission
     * @retval FALSE  This is a new frame and not a retransmission of an earlier frame.
     *
     */
    bool IsARetransmission(void) const { return mInfo.mTxInfo.mIsARetx; }

    /**
     * This method sets the retransmission flag attribute.
     *
     * @param[in]  aIsARetx  TRUE if frame is a retransmission of an earlier frame, FALSE otherwise.
     *
     */
    void SetIsARetransmission(bool aIsARetx) { mInfo.mTxInfo.mIsARetx = aIsARetx; }

    /**
     * This method indicates whether or not CSMA-CA is enabled.
     *
     * @retval TRUE   CSMA-CA is enabled.
     * @retval FALSE  CSMA-CA is not enabled is not enabled.
     *
     */
    bool IsCsmaCaEnabled(void) const { return mInfo.mTxInfo.mCsmaCaEnabled; }

    /**
     * This method sets the CSMA-CA enabled attribute.
     *
     * @param[in]  aCsmaCaEnabled  TRUE if CSMA-CA must be enabled for this packet, FALSE otherwise.
     *
     */
    void SetCsmaCaEnabled(bool aCsmaCaEnabled) { mInfo.mTxInfo.mCsmaCaEnabled = aCsmaCaEnabled; }

    /**
     * This method returns the key used for frame encryption and authentication (AES CCM).
     *
     * @returns The pointer to the key.
     *
     */
    const Mac::KeyMaterial &GetAesKey(void) const
    {
        return *static_cast<const Mac::KeyMaterial *>(mInfo.mTxInfo.mAesKey);
    }

    /**
     * This method sets the key used for frame encryption and authentication (AES CCM).
     *
     * @param[in]  aAesKey  The pointer to the key.
     *
     */
    void SetAesKey(const Mac::KeyMaterial &aAesKey) { mInfo.mTxInfo.mAesKey = &aAesKey; }

    /**
     * This method copies the PSDU and all attributes (except for frame link type) from another frame.
     *
     * @note This method performs a deep copy meaning the content of PSDU buffer from the given frame is copied into
     * the PSDU buffer of the current frame.

     * @param[in] aFromFrame  The frame to copy from.
     *
     */
    void CopyFrom(const TxFrame &aFromFrame);

    /**
     * This method performs AES CCM on the frame which is going to be sent.
     *
     * @param[in]  aExtAddress  A reference to the extended address, which will be used to generate nonce
     *                          for AES CCM computation.
     *
     */
    void ProcessTransmitAesCcm(const ExtAddress &aExtAddress);

    /**
     * This method indicates whether or not the frame has security processed.
     *
     * @retval TRUE   The frame already has security processed.
     * @retval FALSE  The frame does not have security processed.
     *
     */
    bool IsSecurityProcessed(void) const { return mInfo.mTxInfo.mIsSecurityProcessed; }

    /**
     * This method sets the security processed flag attribute.
     *
     * @param[in]  aIsSecurityProcessed  TRUE if the frame already has security processed.
     *
     */
    void SetIsSecurityProcessed(bool aIsSecurityProcessed)
    {
        mInfo.mTxInfo.mIsSecurityProcessed = aIsSecurityProcessed;
    }

    /**
     * This method indicates whether or not the frame header is updated.
     *
     * @retval TRUE   The frame already has the header updated.
     * @retval FALSE  The frame does not have the header updated.
     *
     */
    bool IsHeaderUpdated(void) const { return mInfo.mTxInfo.mIsHeaderUpdated; }

    /**
     * This method sets the header updated flag attribute.
     *
     * @param[in]  aIsHeaderUpdated  TRUE if the frame header is updated.
     *
     */
    void SetIsHeaderUpdated(bool aIsHeaderUpdated) { mInfo.mTxInfo.mIsHeaderUpdated = aIsHeaderUpdated; }

#if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE
    /**
     * This method sets the Time IE offset.
     *
     * @param[in]  aOffset  The Time IE offset, 0 means no Time IE.
     *
     */
    void SetTimeIeOffset(uint8_t aOffset) { mInfo.mTxInfo.mIeInfo->mTimeIeOffset = aOffset; }

    /**
     * This method gets the Time IE offset.
     *
     * @returns The Time IE offset, 0 means no Time IE.
     *
     */
    uint8_t GetTimeIeOffset(void) const { return mInfo.mTxInfo.mIeInfo->mTimeIeOffset; }

    /**
     * This method sets the offset to network time.
     *
     * @param[in]  aNetworkTimeOffset  The offset to network time.
     *
     */
    void SetNetworkTimeOffset(int64_t aNetworkTimeOffset)
    {
        mInfo.mTxInfo.mIeInfo->mNetworkTimeOffset = aNetworkTimeOffset;
    }

    /**
     * This method sets the time sync sequence.
     *
     * @param[in]  aTimeSyncSeq  The time sync sequence.
     *
     */
    void SetTimeSyncSeq(uint8_t aTimeSyncSeq) { mInfo.mTxInfo.mIeInfo->mTimeSyncSeq = aTimeSyncSeq; }
#endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE

    /**
     * Generate Imm-Ack in this frame object.
     *
     * @param[in]    aFrame             A reference to the frame received.
     * @param[in]    aIsFramePending    Value of the ACK's frame pending bit.
     *
     */
    void GenerateImmAck(const RxFrame &aFrame, bool aIsFramePending);

    /**
     * Generate Enh-Ack in this frame object.
     *
     * @param[in]    aFrame             A reference to the frame received.
     * @param[in]    aIsFramePending    Value of the ACK's frame pending bit.
     * @param[in]    aIeData            A pointer to the IE data portion of the ACK to be sent.
     * @param[in]    aIeLength          The length of IE data portion of the ACK to be sent.
     *
     * @retval  kErrorNone           Successfully generated Enh Ack.
     * @retval  kErrorParse          @p aFrame has incorrect format.
     *
     */
    Error GenerateEnhAck(const RxFrame &aFrame, bool aIsFramePending, const uint8_t *aIeData, uint8_t aIeLength);

#if OPENTHREAD_CONFIG_THREAD_VERSION >= OT_THREAD_VERSION_1_2
    /**
     * Set TX delay field for the frame.
     *
     * @param[in]    aTxDelay    The delay time for the TX frame.
     *
     */
    void SetTxDelay(uint32_t aTxDelay) { mInfo.mTxInfo.mTxDelay = aTxDelay; }

    /**
     * Set TX delay base time field for the frame.
     *
     * @param[in]    aTxDelayBaseTime    The delay base time for the TX frame.
     *
     */
    void SetTxDelayBaseTime(uint32_t aTxDelayBaseTime) { mInfo.mTxInfo.mTxDelayBaseTime = aTxDelayBaseTime; }
#endif
};

OT_TOOL_PACKED_BEGIN
class Beacon
{
public:
    static constexpr uint16_t kSuperFrameSpec = 0x0fff; ///< Superframe Specification value.

    /**
     * This method initializes the Beacon message.
     *
     */
    void Init(void)
    {
        mSuperframeSpec     = HostSwap16(kSuperFrameSpec);
        mGtsSpec            = 0;
        mPendingAddressSpec = 0;
    }

    /**
     * This method indicates whether or not the beacon appears to be a valid Thread Beacon message.
     *
     * @retval TRUE   If the beacon appears to be a valid Thread Beacon message.
     * @retval FALSE  If the beacon does not appear to be a valid Thread Beacon message.
     *
     */
    bool IsValid(void) const
    {
        return (mSuperframeSpec == HostSwap16(kSuperFrameSpec)) && (mGtsSpec == 0) && (mPendingAddressSpec == 0);
    }

    /**
     * This method returns the pointer to the beacon payload.
     *
     * @returns A pointer to the beacon payload.
     *
     */
    uint8_t *GetPayload(void) { return reinterpret_cast<uint8_t *>(this) + sizeof(*this); }

    /**
     * This method returns the pointer to the beacon payload.
     *
     * @returns A pointer to the beacon payload.
     *
     */
    const uint8_t *GetPayload(void) const { return reinterpret_cast<const uint8_t *>(this) + sizeof(*this); }

private:
    uint16_t mSuperframeSpec;
    uint8_t  mGtsSpec;
    uint8_t  mPendingAddressSpec;
} OT_TOOL_PACKED_END;

/**
 * This class implements CSL IE data structure.
 *
 */
OT_TOOL_PACKED_BEGIN
class CslIe
{
public:
    static constexpr uint8_t kHeaderIeId    = 0x1a;
    static constexpr uint8_t kIeContentSize = sizeof(uint16_t) * 2;

    /**
     * This method returns the CSL Period.
     *
     * @returns the CSL Period.
     *
     */
    uint16_t GetPeriod(void) const { return HostSwap16(mPeriod); }

    /**
     * This method sets the CSL Period.
     *
     * @param[in]  aPeriod  The CSL Period.
     *
     */
    void SetPeriod(uint16_t aPeriod) { mPeriod = HostSwap16(aPeriod); }

    /**
     * This method returns the CSL Phase.
     *
     * @returns the CSL Phase.
     *
     */
    uint16_t GetPhase(void) const { return HostSwap16(mPhase); }

    /**
     * This method sets the CSL Phase.
     *
     * @param[in]  aPhase  The CSL Phase.
     *
     */
    void SetPhase(uint16_t aPhase) { mPhase = HostSwap16(aPhase); }

private:
    uint16_t mPhase;
    uint16_t mPeriod;
} OT_TOOL_PACKED_END;

/**
 * This class implements Termination2 IE.
 *
 * This class is empty for template specialization.
 *
 */
class Termination2Ie
{
public:
    static constexpr uint8_t kHeaderIeId    = 0x7f;
    static constexpr uint8_t kIeContentSize = 0;
};

/**
 * @}
 *
 */

} // namespace Mac
} // namespace ot

#endif // MAC_FRAME_HPP_