105 lines
4.4 KiB
C#
105 lines
4.4 KiB
C#
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/*
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This file is part of PacketDotNet
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PacketDotNet is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PacketDotNet is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PacketDotNet. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copyright 2009 Chris Morgan <chmorgan@gmail.com>
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*/
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namespace PacketDotNet
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{
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/// <summary>
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/// IP protocol field encoding information.
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/// </summary>
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public struct IPv4Fields
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{
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/// <summary> Width of the IP version and header length field in bytes.</summary>
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public readonly static int VersionAndHeaderLengthLength = 1;
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/// <summary> Width of the Differentiated Services / Type of service field in bytes.</summary>
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public readonly static int DifferentiatedServicesLength = 1;
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/// <summary> Width of the total length field in bytes.</summary>
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public readonly static int TotalLengthLength = 2;
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/// <summary> Width of the ID field in bytes.</summary>
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public readonly static int IdLength = 2;
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/// <summary> Width of the fragment offset bits and offset field in bytes.</summary>
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public readonly static int FragmentOffsetAndFlagsLength = 2;
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/// <summary> Width of the TTL field in bytes.</summary>
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public readonly static int TtlLength = 1;
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/// <summary> Width of the IP protocol code in bytes.</summary>
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public readonly static int ProtocolLength = 1;
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/// <summary> Width of the IP checksum in bytes.</summary>
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public readonly static int ChecksumLength = 2;
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/// <summary> Position of the version code and header length within the IP header.</summary>
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public readonly static int VersionAndHeaderLengthPosition = 0;
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/// <summary> Position of the differentiated services value within the IP header.</summary>
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public readonly static int DifferentiatedServicesPosition;
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/// <summary> Position of the header length within the IP header.</summary>
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public readonly static int TotalLengthPosition;
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/// <summary> Position of the packet ID within the IP header.</summary>
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public readonly static int IdPosition;
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/// <summary> Position of the flag bits and fragment offset within the IP header.</summary>
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public readonly static int FragmentOffsetAndFlagsPosition;
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/// <summary> Position of the ttl within the IP header.</summary>
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public readonly static int TtlPosition;
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/// <summary>
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/// Position of the protocol used within the IP data
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/// </summary>
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public readonly static int ProtocolPosition;
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/// <summary> Position of the checksum within the IP header.</summary>
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public readonly static int ChecksumPosition;
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/// <summary> Position of the source IP address within the IP header.</summary>
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public readonly static int SourcePosition;
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/// <summary> Position of the destination IP address within a packet.</summary>
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public readonly static int DestinationPosition;
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/// <summary> Length in bytes of an IP header, excluding options.</summary>
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public readonly static int HeaderLength; // == 20
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/// <summary>
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/// Number of bytes in an IPv4 address
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/// </summary>
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public readonly static int AddressLength = 4;
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static IPv4Fields()
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{
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DifferentiatedServicesPosition = VersionAndHeaderLengthPosition + VersionAndHeaderLengthLength;
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TotalLengthPosition = DifferentiatedServicesPosition + DifferentiatedServicesLength;
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IdPosition = TotalLengthPosition + TotalLengthLength;
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FragmentOffsetAndFlagsPosition = IdPosition + IdLength;
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TtlPosition = FragmentOffsetAndFlagsPosition + FragmentOffsetAndFlagsLength;
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ProtocolPosition = TtlPosition + TtlLength;
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ChecksumPosition = ProtocolPosition + ProtocolLength;
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SourcePosition = ChecksumPosition + ChecksumLength;
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DestinationPosition = SourcePosition + AddressLength;
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HeaderLength = DestinationPosition + AddressLength;
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}
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}
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}
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