src/core/thread/thread_tlvs.hpp

/*
 *  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 and methods for generating and processing Thread Network Layer TLVs.
 */

#ifndef THREAD_TLVS_HPP_
#define THREAD_TLVS_HPP_

#include "openthread-core-config.h"

#include "common/encoding.hpp"
#include "common/message.hpp"
#include "common/tlvs.hpp"
#include "net/ip6_address.hpp"
#include "thread/mle.hpp"
#include "thread/mle_types.hpp"

namespace ot {

using ot::Encoding::BigEndian::HostSwap16;
using ot::Encoding::BigEndian::HostSwap32;

enum
{
    kCoapUdpPort = 61631,
};

/**
 * This class implements Network Layer TLV generation and parsing.
 *
 */
OT_TOOL_PACKED_BEGIN
class ThreadTlv : public ot::Tlv
{
public:
    /**
     * Network Layer TLV Types.
     *
     */
    enum Type
    {
        kTarget              = 0,  ///< Target EID TLV
        kExtMacAddress       = 1,  ///< Extended MAC Address TLV
        kRloc16              = 2,  ///< RLOC16 TLV
        kMeshLocalEid        = 3,  ///< ML-EID TLV
        kStatus              = 4,  ///< Status TLV
        kLastTransactionTime = 6,  ///< Time Since Last Transaction TLV
        kRouterMask          = 7,  ///< Router Mask TLV
        kNDOption            = 8,  ///< ND Option TLV
        kNDData              = 9,  ///< ND Data TLV
        kThreadNetworkData   = 10, ///< Thread Network Data TLV
    };

    /**
     * This method returns the Type value.
     *
     * @returns The Type value.
     *
     */
    Type GetType(void) const { return static_cast<Type>(ot::Tlv::GetType()); }

    /**
     * This method sets the Type value.
     *
     * @param[in]  aType  The Type value.
     *
     */
    void SetType(Type aType) { ot::Tlv::SetType(static_cast<uint8_t>(aType)); }

} OT_TOOL_PACKED_END;

/**
 * This class defines Status TLV constants.
 *
 */
class ThreadStatusTlv
{
public:
    /**
     * Status values.
     *
     */
    enum Status
    {
        kSuccess               = 0, ///< Success.
        kNoAddressAvailable    = 1, ///< No address available.
        kTooFewRouters         = 2, ///< Address Solicit due to too few routers.
        kHaveChildIdRequest    = 3, ///< Address Solicit due to child ID request.
        kParentPartitionChange = 4, ///< Address Solicit due to parent partition change
    };
};

/**
 * This class implements Router Mask TLV generation and parsing.
 *
 */
class ThreadRouterMaskTlv : public ThreadTlv
{
public:
    /**
     * This method initializes the TLV.
     *
     */
    void Init(void)
    {
        SetType(kRouterMask);
        SetLength(sizeof(*this) - sizeof(ThreadTlv));
        mAssignedRouterIdMask.Clear();
    }

    /**
     * This method indicates whether or not the TLV appears to be well-formed.
     *
     * @retval TRUE   If the TLV appears to be well-formed.
     * @retval FALSE  If the TLV does not appear to be well-formed.
     *
     */
    bool IsValid(void) const { return GetLength() >= sizeof(*this) - sizeof(ThreadTlv); }

    /**
     * This method returns the ID Sequence value.
     *
     * @returns The ID Sequence value.
     *
     */
    uint8_t GetIdSequence(void) const { return mIdSequence; }

    /**
     * This method sets the ID Sequence value.
     *
     * @param[in]  aSequence  The ID Sequence value.
     *
     */
    void SetIdSequence(uint8_t aSequence) { mIdSequence = aSequence; }

    /**
     * This method gets the Assigned Router ID Mask.
     *
     * @returns The Assigned Router ID Mask.
     *
     */
    const Mle::RouterIdSet &GetAssignedRouterIdMask(void) const { return mAssignedRouterIdMask; }

    /**
     * This method sets the Assigned Router ID Mask.
     *
     * @param[in]  aRouterIdSet A reference to the Assigned Router ID Mask.
     *
     */
    void SetAssignedRouterIdMask(const Mle::RouterIdSet &aRouterIdSet) { mAssignedRouterIdMask = aRouterIdSet; }

private:
    uint8_t          mIdSequence;
    Mle::RouterIdSet mAssignedRouterIdMask;
};

/**
 * This class implements Thread Network Data TLV generation and parsing.
 *
 */
OT_TOOL_PACKED_BEGIN
class ThreadNetworkDataTlv : public ThreadTlv
{
public:
    /**
     * This method initializes the TLV.
     *
     */
    void Init(void)
    {
        SetType(kThreadNetworkData);
        SetLength(0);
    }

    /**
     * This method overrides same method of the base class
     *
     * @retval TRUE  the TLV appears to be well-formed.
     *
     */
    bool IsValid(void) const { return true; }

    /**
     * This method returns a pointer to the Network Data TLVs.
     *
     * @returns A pointer to the Network Data TLVs.
     *
     */
    uint8_t *GetTlvs(void) { return mTlvs; }

private:
    enum
    {
        kMaxSize = 255,
    };

    uint8_t mTlvs[kMaxSize];
} OT_TOOL_PACKED_END;

} // namespace ot

#endif // THREAD_TLVS_HPP_