IPv6Extensions.h

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#ifndef PACKETPP_IPV6_EXTENSION
#define PACKETPP_IPV6_EXTENSION

#include <vector>
#include "IpAddress.h"
#include "Layer.h"
#include "TLVData.h"


namespace pcpp
{

    class IPv6Extension
    {
        friend class IPv6Layer;

    public:

        enum IPv6ExtensionType
        {
            IPv6HopByHop = 0,
            IPv6Routing = 43,
            IPv6Fragmentation = 44,
            IPv6AuthenticationHdr = 51,
            IPv6Destination = 60,
            IPv6ExtensionUnknown = 255
        };

        virtual size_t getExtensionLen() const { return 8 * (getBaseHeader()->headerLen+1); }

        IPv6ExtensionType getExtensionType() const { return m_ExtType; }

        virtual ~IPv6Extension();

        IPv6Extension* getNextHeader() const { return m_NextHeader; }

    protected:

        struct ipv6_ext_base_header
        {
            uint8_t nextHeader;
            uint8_t headerLen;
        };

        // protected c'tor
        IPv6Extension(IDataContainer* dataContainer, size_t offset) :
            m_NextHeader(NULL), m_ExtType(IPv6ExtensionUnknown), m_DataContainer(dataContainer), m_Offset(offset), m_ShadowData(NULL) {}

        // protected empty c'tor
        IPv6Extension() :
            m_NextHeader(NULL), m_ExtType(IPv6ExtensionUnknown), m_DataContainer(NULL), m_Offset(0), m_ShadowData(NULL) {}

        // protected assignment operator
        IPv6Extension& operator=(const IPv6Extension& other);

        uint8_t* getDataPtr() const;

        void initShadowPtr(size_t size);

        ipv6_ext_base_header* getBaseHeader() const { return (ipv6_ext_base_header*)getDataPtr(); }

        void setNextHeader(IPv6Extension* nextHeader) { m_NextHeader = nextHeader; }

        IPv6Extension* m_NextHeader;
        IPv6ExtensionType m_ExtType;

    private:
        IDataContainer* m_DataContainer;
        size_t m_Offset;
        uint8_t* m_ShadowData;

    };



    class IPv6FragmentationHeader : public IPv6Extension
    {
        friend class IPv6Layer;

    public:

        struct ipv6_frag_header
        {
            uint8_t nextHeader;
            uint8_t headerLen;
            uint16_t fragOffsetAndFlags;
            uint32_t id;
        };

        IPv6FragmentationHeader(uint32_t fragId, uint16_t fragOffset, bool lastFragment);

        ipv6_frag_header* getFragHeader() const { return (ipv6_frag_header*)getDataPtr(); }

        bool isFirstFragment() const;

        bool isLastFragment() const;

        bool isMoreFragments() const;

        uint16_t getFragmentOffset() const;

    private:

        IPv6FragmentationHeader(IDataContainer* dataContainer, size_t offset) : IPv6Extension(dataContainer, offset)
        {
            m_ExtType = IPv6Fragmentation;
        }

    };


    class IPv6TLVOptionHeader : public IPv6Extension
    {
        friend class IPv6Layer;

    public:

        class IPv6Option : public TLVRecord
        {
        public:

            static const uint8_t Pad0OptionType = 0;
            static const uint8_t PadNOptionType = 1;

            IPv6Option(uint8_t* optionRawData) : TLVRecord(optionRawData) { }

            ~IPv6Option() { }

            // implement abstract methods

            size_t getTotalSize() const
            {
                if (m_Data->recordType == Pad0OptionType)
                    return sizeof(uint8_t);

                return (size_t)(m_Data->recordLen + sizeof(uint16_t));
            }

            size_t getDataSize() const
            {
                if (m_Data->recordType == Pad0OptionType)
                    return (size_t)0;

                return (size_t)m_Data->recordLen;
            }
        };


        class IPv6TLVOptionBuilder : public TLVRecordBuilder
        {
        public:
        
            IPv6TLVOptionBuilder(uint8_t optType, const uint8_t* optValue, uint8_t optValueLen) :
                TLVRecordBuilder(optType, optValue, optValueLen) { }

            IPv6TLVOptionBuilder(uint8_t optType, uint8_t optValue) :
                TLVRecordBuilder(optType, optValue) { }

            IPv6TLVOptionBuilder(uint8_t optType, uint16_t optValue) :
                TLVRecordBuilder(optType, optValue) { }

            IPv6TLVOptionBuilder(const IPv6TLVOptionBuilder& other) :
                TLVRecordBuilder(other) {}

            IPv6TLVOptionBuilder& operator=(const IPv6TLVOptionBuilder& other)
            {
                TLVRecordBuilder::operator=(other);
                return *this;
            }

            IPv6Option build() const;
        };

        IPv6Option getOption(uint8_t optionType) const;

        IPv6Option getFirstOption() const;

        IPv6Option getNextOption(IPv6Option& option) const;

        size_t getOptionCount() const;

    protected:

        IPv6TLVOptionHeader(const std::vector<IPv6TLVOptionBuilder>& options);

        IPv6TLVOptionHeader(IDataContainer* dataContainer, size_t offset);

    private:

        TLVRecordReader<IPv6Option> m_OptionReader;
    };



    class IPv6HopByHopHeader : public IPv6TLVOptionHeader
    {
        friend class IPv6Layer;

    public:

        IPv6HopByHopHeader(const std::vector<IPv6TLVOptionBuilder>& options) : IPv6TLVOptionHeader(options) { m_ExtType = IPv6HopByHop; }

    private:

        IPv6HopByHopHeader(IDataContainer* dataContainer, size_t offset) : IPv6TLVOptionHeader(dataContainer, offset) { m_ExtType = IPv6HopByHop; }
    };



    class IPv6DestinationHeader : public IPv6TLVOptionHeader
    {
        friend class IPv6Layer;

    public:

        IPv6DestinationHeader(const std::vector<IPv6TLVOptionBuilder>& options) : IPv6TLVOptionHeader(options) { m_ExtType = IPv6Destination; }

    private:

        IPv6DestinationHeader(IDataContainer* dataContainer, size_t offset) : IPv6TLVOptionHeader(dataContainer, offset) { m_ExtType = IPv6Destination; }
    };



    class IPv6RoutingHeader : public IPv6Extension
    {
        friend class IPv6Layer;

    public:

        struct ipv6_routing_header
        {
            uint8_t nextHeader;
            uint8_t headerLen;
            uint8_t routingType;
            uint8_t segmentsLeft;
        };

        IPv6RoutingHeader(uint8_t routingType, uint8_t segmentsLeft, const uint8_t* additionalRoutingData, size_t additionalRoutingDataLen);

        ipv6_routing_header* getRoutingHeader() const { return (ipv6_routing_header*)getDataPtr(); }

        uint8_t* getRoutingAdditionalData() const;

        size_t getRoutingAdditionalDataLength() const;

        IPv6Address getRoutingAdditionalDataAsIPv6Address(size_t offset = 0) const;

    private:

        IPv6RoutingHeader(IDataContainer* dataContainer, size_t offset) : IPv6Extension(dataContainer, offset) { m_ExtType = IPv6Routing; }

    };


    class IPv6AuthenticationHeader : public IPv6Extension
    {
        friend class IPv6Layer;

    public:

        struct ipv6_authentication_header
        {
            uint8_t nextHeader;
            uint8_t headerLen;
            uint16_t reserved;
            uint32_t securityParametersIndex;
            uint32_t sequenceNumber;
        };

        IPv6AuthenticationHeader(uint32_t securityParametersIndex, uint32_t sequenceNumber, const uint8_t* integrityCheckValue, size_t integrityCheckValueLen);

        ipv6_authentication_header* getAuthHeader() const { return (ipv6_authentication_header*)getDataPtr(); }

        uint8_t* getIntegrityCheckValue() const;

        size_t getIntegrityCheckValueLength() const;

        // overridden methods

        size_t getExtensionLen() const { return 4 * (getBaseHeader()->headerLen+2); }

    private:

        IPv6AuthenticationHeader(IDataContainer* dataContainer, size_t offset) : IPv6Extension(dataContainer, offset) { m_ExtType = IPv6AuthenticationHdr; }
    };

}

#endif // PACKETPP_IPV6_EXTENSION