public static IpV6Layer NextIpV6Layer(this Random random, IpV4Protocol?lastNextHeader, bool allowEncapsulatingSecurityPayload)
{
IpV6ExtensionHeaders extensionHeaders = random.NextIpV6ExtensionHeaders(random.NextInt(0, 10), lastNextHeader, allowEncapsulatingSecurityPayload);
IpV4Protocol? nextHeader = extensionHeaders.FirstHeader ?? lastNextHeader;
return(new IpV6Layer
{
TrafficClass = random.NextByte(),
FlowLabel = random.NextInt(0, IpV6Datagram.MaxFlowLabel + 1),
NextHeader = nextHeader,
HopLimit = random.NextByte(),
Source = random.NextIpV6Address(),
CurrentDestination = random.NextIpV6Address(),
ExtensionHeaders = extensionHeaders,
});
}
private void ParseExtensionHeaders()
{
if (_extensionHeaders != null)
{
return;
}
if (Length < HeaderLength)
{
_isValidExtensionHeaders = false;
_extensionHeaders = IpV6ExtensionHeaders.Empty;
return;
}
_extensionHeaders = new IpV6ExtensionHeaders(Subsegment(HeaderLength, RealPayloadLength), NextHeader);
_isValidExtensionHeaders = _isValidExtensionHeaders && _extensionHeaders.IsValid;
}
private void ParseExtensionHeaders()
{
if (_extensionHeaders != null)
return;
if (Length < HeaderLength)
{
_isValidExtensionHeaders = false;
_extensionHeaders = IpV6ExtensionHeaders.Empty;
return;
}
_extensionHeaders = new IpV6ExtensionHeaders(Subsegment(HeaderLength, RealPayloadLength), NextHeader);
_isValidExtensionHeaders = _isValidExtensionHeaders && _extensionHeaders.IsValid;
}
internal static void WriteHeader(byte[] buffer, int offset,
byte trafficClass, int flowLabel, ushort payloadLength, IpV4Protocol? nextHeader, IpV4Protocol? nextLayerProtocol,
byte hopLimit, IpV6Address source, IpV6Address currentDestination, IpV6ExtensionHeaders extensionHeaders)
{
buffer.Write(offset + Offset.Version, (uint)((((DefaultVersion << 8) | trafficClass) << 20) | flowLabel), Endianity.Big);
buffer.Write(offset + Offset.PayloadLength, payloadLength, Endianity.Big);
IpV4Protocol actualNextHeader;
if (nextHeader.HasValue)
actualNextHeader = nextHeader.Value;
else if (extensionHeaders.Any())
actualNextHeader = extensionHeaders.FirstHeader.Value;
else if (nextLayerProtocol.HasValue)
actualNextHeader = nextLayerProtocol.Value;
else
throw new InvalidOperationException("Can't determine next header. No extension headers and no known next layer protocol.");
buffer.Write(offset + Offset.NextHeader, (byte)actualNextHeader);
buffer.Write(offset + Offset.HopLimit, hopLimit);
buffer.Write(offset + Offset.SourceAddress, source, Endianity.Big);
buffer.Write(offset + Offset.DestinationAddress, currentDestination, Endianity.Big);
extensionHeaders.Write(buffer, offset + HeaderLength, nextLayerProtocol);
}
internal static void WriteHeader(byte[] buffer, int offset,
byte trafficClass, int flowLabel, ushort payloadLength, IpV4Protocol?nextHeader, IpV4Protocol?nextLayerProtocol,
byte hopLimit, IpV6Address source, IpV6Address currentDestination, IpV6ExtensionHeaders extensionHeaders)
{
buffer.Write(offset + Offset.Version, (uint)((((DefaultVersion << 8) | trafficClass) << 20) | flowLabel), Endianity.Big);
buffer.Write(offset + Offset.PayloadLength, payloadLength, Endianity.Big);
IpV4Protocol actualNextHeader;
if (nextHeader.HasValue)
{
actualNextHeader = nextHeader.Value;
}
else if (extensionHeaders.Any())
{
actualNextHeader = extensionHeaders.FirstHeader.Value;
}
else if (nextLayerProtocol.HasValue)
{
actualNextHeader = nextLayerProtocol.Value;
}
else
{
throw new InvalidOperationException("Can't determine next header. No extension headers and no known next layer protocol.");
}
buffer.Write(offset + Offset.NextHeader, (byte)actualNextHeader);
buffer.Write(offset + Offset.HopLimit, hopLimit);
buffer.Write(offset + Offset.SourceAddress, source, Endianity.Big);
buffer.Write(offset + Offset.DestinationAddress, currentDestination, Endianity.Big);
extensionHeaders.Write(buffer, offset + HeaderLength, nextLayerProtocol);
}
