/// <summary> /// Simple constructor for the UDP header. /// </summary> public UdpHeader() : base() { srcPort = 0; destPort = 0; udpLength = 0; udpChecksum = 0; ipv6PacketHeader = null; ipv4PacketHeader = null; }
/// <summary> /// Constructor for the ICMPv6 header which also takes a reference to the /// encompassing IPv6 header. This is necessary since the IPv6 protocol /// defines a pseudo header checksum which requires the checksum to be /// calculated over fields in the ICMPv6 header and payload as well as /// fields from the IPv6 packet. /// </summary> /// <param name="packetHeader">Reference to the Ipv6Header object encompassing the ICMPv6 packet</param> public Icmpv6Header(Ipv6Header packetHeader) : base() { icmpType = 0; icmpCode = 0; icmpChecksum = 0; ipv6Header = packetHeader; }
/// <summary> /// This routine creates an instance of the Ipv6Header class from a byte /// array that is a received IGMP packet. This is useful when a packet /// is received from the network and the header object needs to be /// constructed from those values. /// </summary> /// <param name="ipv6Packet">Byte array containing the binary IPv6 header</param> /// <param name="bytesCopied">Number of bytes used in header</param> /// <returns>Returns the Ipv6Header object created from the byte array</returns> public static Ipv6Header Create(byte[] ipv6Packet, ref int bytesCopied) { Ipv6Header ipv6Header = new Ipv6Header(); byte[] addressBytes = new byte[16]; uint tempVal = 0, tempVal2 = 0; // Ensure byte array is large enough to contain an IPv6 header if (ipv6Packet.Length < Ipv6Header.Ipv6HeaderLength) return null; tempVal = ipv6Packet[0]; tempVal = (tempVal >> 4) & 0xF; ipv6Header.ipVersion = (byte)tempVal; tempVal = ipv6Packet[0]; tempVal = (tempVal & 0xF) >> 4; ipv6Header.ipTrafficClass = (byte)(tempVal | (uint)((ipv6Packet[1] >> 4) & 0xF)); tempVal2 = ipv6Packet[1]; tempVal2 = (tempVal2 & 0xF) << 16; tempVal = ipv6Packet[2]; tempVal = tempVal << 8; ipv6Header.ipFlow = tempVal2 | tempVal | ipv6Packet[3]; ipv6Header.ipNextHeader = ipv6Packet[4]; ipv6Header.ipHopLimit = ipv6Packet[5]; Array.Copy(ipv6Packet, 6, addressBytes, 0, 16); ipv6Header.SourceAddress = new IPAddress(addressBytes); Array.Copy(ipv6Packet, 24, addressBytes, 0, 16); ipv6Header.DestinationAddress = new IPAddress(addressBytes); bytesCopied = Ipv6Header.Ipv6HeaderLength; return ipv6Header; }