102 lines
3.6 KiB
C#
102 lines
3.6 KiB
C#
/*
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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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/// A struct containing length and position information about IPv6 Fields.
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/// </summary>
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public struct IPv6Fields
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{
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/// <summary>
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/// The IP Version, Traffic Class, and Flow Label field length. These must be in one
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/// field due to boundary crossings.
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/// </summary>
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public readonly static int VersionTrafficClassFlowLabelLength = 4;
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/// <summary>
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/// The payload length field length.
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/// </summary>
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public readonly static int PayloadLengthLength = 2;
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/// <summary>
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/// The next header field length, identifies protocol encapsulated by the packet
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/// </summary>
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public readonly static int NextHeaderLength = 1;
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/// <summary>
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/// The hop limit field length.
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/// </summary>
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public readonly static int HopLimitLength = 1;
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/// <summary>
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/// Address field length
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/// </summary>
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public readonly static int AddressLength = 16;
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/// <summary>
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/// The byte position of the field line in the IPv6 header.
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/// This is where the IP version, Traffic Class, and Flow Label fields are.
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/// </summary>
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public readonly static int VersionTrafficClassFlowLabelPosition = 0;
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/// <summary>
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/// The byte position of the payload length field.
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/// </summary>
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public readonly static int PayloadLengthPosition;
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/// <summary>
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/// The byte position of the next header field. (Replaces the ipv4 protocol field)
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/// </summary>
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public readonly static int NextHeaderPosition;
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/// <summary>
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/// The byte position of the hop limit field.
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/// </summary>
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public readonly static int HopLimitPosition;
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/// <summary>
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/// The byte position of the source address field.
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/// </summary>
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public readonly static int SourceAddressPosition;
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/// <summary>
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/// The byte position of the destination address field.
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/// </summary>
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public readonly static int DestinationAddressPosition;
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/// <summary>
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/// The byte length of the IPv6 Header
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/// </summary>
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public readonly static int HeaderLength; // == 40
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/// <summary>
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/// Commutes the field positions.
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/// </summary>
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static IPv6Fields( )
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{
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PayloadLengthPosition = VersionTrafficClassFlowLabelPosition + VersionTrafficClassFlowLabelLength;
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NextHeaderPosition = PayloadLengthPosition + PayloadLengthLength;
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HopLimitPosition = NextHeaderPosition + NextHeaderLength;
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SourceAddressPosition = HopLimitPosition + HopLimitLength;
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DestinationAddressPosition = SourceAddressPosition + AddressLength;
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HeaderLength = DestinationAddressPosition + AddressLength;
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}
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}
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} |