net.clackrouter.component.tcp
Class TCPChecksum

java.lang.Object
  net.clackrouter.component.tcp.TCPChecksum

public class TCPChecksum
extends java.lang.Object

Helper class to perform the TCP checksum algorithm.

Field Summary

static int

CHECKSUM_OFFSET

Constructor Summary

TCPChecksum()

Method Summary

static int	calcTCPChecksum(IPPacket ippacket) Calculates the TCP checksum for the supplied IP packet
static void	setTCPChecksum(IPPacket ippacket) Sets the Checksum field in the TCP header.
static boolean	verifyTCPChecksum(IPPacket ippacket) Verifies the Checksum field in the TCP header.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CHECKSUM_OFFSET

public static final int CHECKSUM_OFFSET

See Also:

Constant Field Values

Constructor Detail

TCPChecksum

public TCPChecksum()

Method Detail

calcTCPChecksum

public static int calcTCPChecksum(IPPacket ippacket)

Calculates the TCP checksum for the supplied IP packet

Parameters:

ippacket -

Returns:

TCP header checksum

setTCPChecksum

public static void setTCPChecksum(IPPacket ippacket)

Sets the Checksum field in the TCP header.

Parameters:

ippacket -

verifyTCPChecksum

public static boolean verifyTCPChecksum(IPPacket ippacket)

Verifies the Checksum field in the TCP header.

Parameters:

ippacket -

Returns:

true if the checksum is value, false otherwise.