private void ParseExtensionHeaders()
{
if (_extensionHeaders != null)
{
return;
}
List <IpV6ExtensionHeader> extensionHeaders = new List <IpV6ExtensionHeader>();
if (HeaderLength > RealPayloadLength)
{
_isValid = false;
_extensionHeaders = extensionHeaders.AsReadOnly();
return;
}
int extendedHeaderLength = HeaderLength;
IpV4Protocol?nextHeader = NextHeader;
while (extendedHeaderLength + 8 <= RealPayloadLength && nextHeader.HasValue && IsExtensionHeader(nextHeader.Value))
{
int numBytesRead;
IpV6ExtensionHeader extensionHeader = IpV6ExtensionHeader.CreateInstance(nextHeader.Value,
Subsegment(extendedHeaderLength, Length - extendedHeaderLength),
out numBytesRead);
if (extensionHeader == null)
{
break;
}
nextHeader = extensionHeader.NextHeader;
extendedHeaderLength += numBytesRead;
}
_isValid = (!nextHeader.HasValue || !IsExtensionHeader(nextHeader.Value)) && (HeaderLength + _extensionHeadersLength == PayloadLength);
_extensionHeaders = extensionHeaders.AsReadOnly();
_extensionHeadersLength = extendedHeaderLength - HeaderLength;
}