IPv4Packet.hh

Go to the documentation of this file.

//
// Copyright (c) 2020 Fraunhofer Institute for Applied Information Technology (FIT)
//                    Network Research Group (NET)
//                    Schloss Birlinghoven, 53754 Sankt Augustin, GERMANY
//                    Contact: support@wiback.org
//
// This file is part of the SENF code tree.
// It is licensed under the 3-clause BSD License (aka New BSD License).
// See LICENSE.txt in the top level directory for details or visit
// https://opensource.org/licenses/BSD-3-Clause
//


#ifndef HH_SENF_Packets_DefaultBundle_IPv4Packet_
#define HH_SENF_Packets_DefaultBundle_IPv4Packet_ 1

// Custom includes
#include <senf/Socket/Protocols/INet/INet4Address.hh>
#include <senf/Packets/Packets.hh>
#include "Registries.hh"

//-/////////////////////////////////////////////////////////////////////////////////////////////////

namespace senf {

    struct INet4AddressParser
        : public ArrayValueParserBase<INet4AddressParser, INet4Address>
    {
        INet4AddressParser(data_iterator i, state_type s) : Base(i,s) {}

        using Base::operator=;
    };

    struct IPv4PacketParser : public PacketParserBase
    {
#       include SENF_FIXED_PARSER()

        SENF_PARSER_BITFIELD( version, 4, unsigned );
        SENF_PARSER_BITFIELD( ihl,     4, unsigned );

        // Originally defined as the Type of service (TOS), now DiffServ
        SENF_PARSER_BITFIELD( dscp, 6, unsigned );
        SENF_PARSER_BITFIELD( ecn,  2, unsigned );

        SENF_PARSER_FIELD( length,     UInt16Parser );
        SENF_PARSER_FIELD( identifier, UInt16Parser );

        SENF_PARSER_PRIVATE_BITFIELD( reserved,  1, bool     );
        SENF_PARSER_BITFIELD        ( df,        1, bool     );
        SENF_PARSER_BITFIELD        ( mf,        1, bool     );
        SENF_PARSER_BITFIELD        ( frag,     13, unsigned );

        SENF_PARSER_FIELD( ttl,         UInt8Parser        );
        SENF_PARSER_FIELD( protocol,    UInt8Parser        );
        SENF_PARSER_FIELD( checksum,    UInt16Parser       );
        SENF_PARSER_FIELD( source,      INet4AddressParser );
        SENF_PARSER_FIELD( destination, INet4AddressParser );

        SENF_PARSER_FINALIZE( IPv4PacketParser );

        SENF_PARSER_INIT() {
            version() = 4;
            // We don't support option headers at the moment ...
            ihl() = 5;
        }

        boost::uint16_t calcChecksum() const; 

        bool validateChecksum() const {
            return checksum() == calcChecksum();
        }                               

    };


    struct IPv4PacketType
        : public PacketTypeBase,
          public PacketTypeMixin<IPv4PacketType, IPTypes>
    {
        typedef PacketTypeMixin<IPv4PacketType, IPTypes> mixin;
        typedef ConcretePacket<IPv4PacketType> packet;  
        typedef IPv4PacketParser parser;                

        using mixin::nextPacketRange;
        using mixin::nextPacketType;
        using mixin::initSize;
        using mixin::init;

        static key_t nextPacketKey(packet p)
            { return p->protocol(); }

        static void dump(packet p, std::ostream & os);

        static void finalize(packet p); 

        static const EtherTypes::key_t etherType = 0x0800;
    };

    typedef ConcretePacket<IPv4PacketType> IPv4Packet;
    SENF_PACKET_PREVENT_TEMPLATE_INSTANTIATION( IPv4Packet );
}


//-/////////////////////////////////////////////////////////////////////////////////////////////////
//#include "IPv4Packet.cci"
//#include "IPv4Packet.ct"
//#include "IPv4Packet.cti"
#endif


// Local Variables:
// mode: c++
// fill-column: 100
// c-file-style: "senf"
// indent-tabs-mode: nil
// ispell-local-dictionary: "american"
// compile-command: "scons -u test"
// comment-column: 40
// End: