public byte[] ToBytes()
{
byte[] byteValue;
byte[] payload = Payload.ToBytes();
byte[] ipv6Packet = new byte[Ipv6HeaderLength + payload.Length];
int offset = 0;
ipv6Packet[offset++] = (byte)((Version << 4) | ((TrafficClass >> 4) & 0xF));
ipv6Packet[offset++] = (byte)((uint)((TrafficClass << 4) & 0xF0) | (uint)((Flow >> 16) & 0xF));
ipv6Packet[offset++] = (byte)((Flow >> 8) & 0xFF);
ipv6Packet[offset++] = (byte)(Flow & 0xFF);
byteValue = NetUtilities.FromLittleEndian(PayloadLength);
Array.Copy(byteValue, 0, ipv6Packet, offset, byteValue.Length);
offset += byteValue.Length;
ipv6Packet[offset++] = (byte)NextHeader;
ipv6Packet[offset++] = (byte)HopLimit;
byteValue = SourceAddress.GetAddressBytes();
Array.Copy(byteValue, 0, ipv6Packet, offset, byteValue.Length);
offset += byteValue.Length;
byteValue = DestinationAddress.GetAddressBytes();
Array.Copy(byteValue, 0, ipv6Packet, offset, byteValue.Length);
offset += byteValue.Length;
Array.Copy(payload, 0, ipv6Packet, offset, payload.Length);
return(ipv6Packet);
}
public bool FromBytes(byte[] ipv6Packet)
{
byte[] addressBytes = new byte[16];
uint tempVal = 0, tempVal2 = 0;
// Ensure byte array is large enough to contain an IPv6 header
if (ipv6Packet.Length < Ipv6HeaderLength)
{
return(false);
}
tempVal = ipv6Packet[0];
tempVal = (tempVal >> 4) & 0xF;
Version = (byte)tempVal;
tempVal = ipv6Packet[0];
tempVal = (tempVal & 0xF) >> 4;
TrafficClass = (byte)(tempVal | (uint)((ipv6Packet[1] >> 4) & 0xF));
tempVal2 = ipv6Packet[1];
tempVal2 = (tempVal2 & 0xF) << 16;
tempVal = ipv6Packet[2];
tempVal = tempVal << 8;
Flow = tempVal2 | tempVal | ipv6Packet[3];
PayloadLength = NetUtilities.ToLittleEndian(BitConverter.ToUInt16(ipv6Packet, 4));
NextHeader = (IPv6Protocol)ipv6Packet[6];
HopLimit = ipv6Packet[7];
Array.Copy(ipv6Packet, 8, addressBytes, 0, 16);
SourceAddress = new IPv6Address(addressBytes);
Array.Copy(ipv6Packet, 24, addressBytes, 0, 16);
DestinationAddress = new IPv6Address(addressBytes);
packetIndex += Ipv6HeaderLength;
IPv6PseudoHeader ipv6PseudoHeader = new IPv6PseudoHeader(SourceAddress, DestinationAddress, PayloadLength, (byte)NextHeader);
ushort checkSum = ipv6PseudoHeader.GetCheckSum();
if (ipv6Packet.Length > packetIndex)
{
switch (NextHeader)
{
case IPv6Protocol.ICMPv6:
Icmpv6Packet icmpv6packet = new Icmpv6Packet();
if ((icmpv6packet.FromBytes(ipv6Packet, ref packetIndex)) == false)
{
return(false);
}
Payload = icmpv6packet;
checkSum = NetUtilities.ComputeChecksum(checkSum, Payload.ToBytes(), true);
if (checkSum != 0)
{
return(false);
}
break;
case IPv6Protocol.Udp:
UdpDatagram udpDatagram = new UdpDatagram();
if ((udpDatagram.FromBytes(ipv6Packet, ref packetIndex)) == false)
{
return(false);
}
Payload = udpDatagram;
checkSum = NetUtilities.ComputeChecksum(checkSum, Payload.ToBytes(), true);
if (checkSum != 0)
{
return(false);
}
break;
}
}
return(true);
}