SSF.OS.TCP
Class TCP_Header

java.lang.Object
  |
  +--SSF.OS.ProtocolMessage
        |
        +--SSF.OS.TCP.TCP_Header

Direct Known Subclasses:

TCP_Message

public class TCP_Header

extends ProtocolMessage

A simplified TCP header.

Field Summary

static byte	ACK
long	ACKno Acknowledgment number (next sequence number expected)
int	AdvertisedWnd Advertised receive window size
int	DEST_port destination port number
static byte	FIN
byte	flags Control flags of TCP header
static byte	PSH
static byte	RST
long	SEQno sequence number of the first data byte in segment
int	SOURCE_port source port number
static byte	SYN
static byte	URG

Constructor Summary

TCP_Header()

TCP_Header(int source_port, int dest_port, long seqno, long ackno, int advertised, byte flag)
initialize a TCP_Header object

TCP_Header(TCP_Header th)
copy constructor of TCP_Header

Method Summary

int	bytecount() return the number of bytes nominally used by this TCP header
java.lang.String	version() Return the SSF.OS.TCP version number for this header

Methods inherited from class SSF.OS.ProtocolMessage

carryPayload, copy, dropHeader, dropPayload, frombytes, fromVersion, header_bytecount, payload, previous, size, tobytes

Methods inherited from class java.lang.Object

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

Field Detail

DEST_port

public int DEST_port

destination port number

SOURCE_port

public int SOURCE_port

source port number

SEQno

public long SEQno

sequence number of the first data byte in segment

ACKno

public long ACKno

Acknowledgment number (next sequence number expected)

AdvertisedWnd

public int AdvertisedWnd

Advertised receive window size

flags

public byte flags

Control flags of TCP header

FIN

public static byte FIN

SYN

public static byte SYN

RST

public static byte RST

PSH

public static byte PSH

ACK

public static byte ACK

URG

public static byte URG

Constructor Detail

TCP_Header

public TCP_Header(int source_port,
                  int dest_port,
                  long seqno,
                  long ackno,
                  int advertised,
                  byte flag)

initialize a TCP_Header object

Parameters:

dest_port - destination port number

source_port - source port number

seqno - sequence number of the first data byte in segment

ackno - acknowledgment number of the ACK packet

advertised - advertised receiver window size

flag - control flag used to indicate packet type

TCP_Header

public TCP_Header()

TCP_Header

public TCP_Header(TCP_Header th)

copy constructor of TCP_Header

Parameters:

th - TCP_Header object to be copied

Method Detail

bytecount

public int bytecount()

return the number of bytes nominally used by this TCP header

Overrides:

bytecount in class ProtocolMessage

version

public java.lang.String version()

Return the SSF.OS.TCP version number for this header

Overrides:

version in class ProtocolMessage