Header for the Transmission Control Protocol. More...

#include <tcp-header.h>

Inheritance diagram for ns3::TcpHeader:

Collaboration diagram for ns3::TcpHeader:

Public Types
enum	Flags_t { NONE = 0, FIN = 1, SYN = 2, RST = 4, PSH = 8, ACK = 16, URG = 32, ECE = 64, CWR = 128 }

Public Member Functions
	TcpHeader ()
virtual	~TcpHeader ()
virtual uint32_t	Deserialize (Buffer::Iterator start)
void	EnableChecksums (void)
	Enable checksum calculation for TCP (XXX currently has no effect)
SequenceNumber32	GetAckNumber () const
uint16_t	GetDestinationPort () const
uint8_t	GetFlags () const
virtual TypeId	GetInstanceTypeId (void) const
uint8_t	GetLength () const
SequenceNumber32	GetSequenceNumber () const
virtual uint32_t	GetSerializedSize (void) const
uint16_t	GetSourcePort () const
uint16_t	GetUrgentPointer () const
uint16_t	GetWindowSize () const
void	InitializeChecksum (Ipv4Address source, Ipv4Address destination, uint8_t protocol)
void	InitializeChecksum (Ipv6Address source, Ipv6Address destination, uint8_t protocol)
void	InitializeChecksum (Address source, Address destination, uint8_t protocol)
bool	IsChecksumOk (void) const
	Is the TCP checksum correct ?
virtual void	Print (std::ostream &os) const
virtual void	Serialize (Buffer::Iterator start) const
void	SetAckNumber (SequenceNumber32 ackNumber)
void	SetDestinationPort (uint16_t port)
void	SetFlags (uint8_t flags)
void	SetLength (uint8_t length)
void	SetSequenceNumber (SequenceNumber32 sequenceNumber)
void	SetSourcePort (uint16_t port)
void	SetUrgentPointer (uint16_t urgentPointer)
void	SetWindowSize (uint16_t windowSize)
Public Member Functions inherited from ns3::Header
virtual	~Header ()

Static Public Member Functions
static TypeId	GetTypeId (void)
	This method returns the TypeId associated to ns3::TcpHeader.

Private Member Functions
uint16_t	CalculateHeaderChecksum (uint16_t size) const

Private Attributes
SequenceNumber32	m_ackNumber
bool	m_calcChecksum
Address	m_destination
uint16_t	m_destinationPort
uint8_t	m_flags
bool	m_goodChecksum
uint16_t	m_initialChecksum
uint8_t	m_length
uint8_t	m_protocol
SequenceNumber32	m_sequenceNumber
Address	m_source
uint16_t	m_sourcePort
uint16_t	m_urgentPointer
uint16_t	m_windowSize

Additional Inherited Members
Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
virtual void	NotifyConstructionCompleted (void)

Detailed Description

Header for the Transmission Control Protocol.

This class has fields corresponding to those in a network TCP header (port numbers, sequence and acknowledgement numbers, flags, etc) as well as methods for serialization to and deserialization from a byte buffer.

Definition at line 43 of file tcp-header.h.

Member Enumeration Documentation

enum ns3::TcpHeader::Flags_t

Enumerator:

NONE
FIN
SYN
RST
PSH
ACK
URG
ECE
CWR

Definition at line 143 of file tcp-header.h.

Constructor & Destructor Documentation

ns3::TcpHeader::TcpHeader ( )

Definition at line 31 of file tcp-header.cc.

ns3::TcpHeader::~TcpHeader ( )

virtual

Definition at line 45 of file tcp-header.cc.

Member Function Documentation

uint16_t ns3::TcpHeader::CalculateHeaderChecksum ( uint16_t size ) const

private

Definition at line 152 of file tcp-header.cc.

References ns3::Buffer::AddAtStart(), ns3::Buffer::Begin(), ns3::Buffer::Iterator::CalculateIpChecksum(), ns3::Ipv4Address::IsMatchingType(), m_destination, m_protocol, m_source, ns3::Address::MAX_SIZE, ns3::WriteTo(), ns3::Buffer::Iterator::WriteU16(), and ns3::Buffer::Iterator::WriteU8().

Referenced by Deserialize(), and Serialize().

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uint32_t ns3::TcpHeader::Deserialize ( Buffer::Iterator start )

virtual

Parameters

start an iterator which points to where the header should written.

Returns: the number of bytes read.

This method is used by Packet::RemoveHeader to re-create a header from the byte buffer of a packet. The data read is expected to match bit-for-bit the representation of this header in real networks.

Implements ns3::Header.

Definition at line 283 of file tcp-header.cc.

References CalculateHeaderChecksum(), GetSerializedSize(), ns3::Buffer::Iterator::GetSize(), m_ackNumber, m_calcChecksum, m_destinationPort, m_flags, m_goodChecksum, m_length, m_sequenceNumber, m_sourcePort, m_urgentPointer, m_windowSize, ns3::Buffer::Iterator::Next(), ns3::Buffer::Iterator::ReadNtohU16(), ns3::Buffer::Iterator::ReadNtohU32(), and visualizer.core::start().

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void ns3::TcpHeader::EnableChecksums ( void )

Enable checksum calculation for TCP (XXX currently has no effect)

Definition at line 50 of file tcp-header.cc.

References m_calcChecksum.

Referenced by ns3::TcpL4Protocol::Receive(), ns3::TcpL4Protocol::Send(), and ns3::TcpL4Protocol::SendPacket().

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SequenceNumber32 ns3::TcpHeader::GetAckNumber ( ) const

Returns: the ACK number for this TcpHeader

Definition at line 100 of file tcp-header.cc.

References m_ackNumber.

Referenced by ns3::TcpSocketBase::EstimateRtt(), ns3::TcpSocketBase::ProcessSynRcvd(), ns3::TcpSocketBase::ProcessSynSent(), ns3::TcpSocketBase::ProcessWait(), ns3::TcpL4Protocol::Receive(), ns3::TcpSocketBase::ReceivedAck(), ns3::TcpSocketBase::ReceivedData(), and ns3::TcpL4Protocol::SendPacket().

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uint16_t ns3::TcpHeader::GetDestinationPort ( ) const

Returns: the destination port for this TcpHeader

Definition at line 92 of file tcp-header.cc.

References m_destinationPort.

Referenced by ns3::IpcsClassifier::Classify(), ns3::Ipv4FlowClassifier::Classify(), ns3::EpcTftClassifier::Classify(), and ns3::TcpL4Protocol::Receive().

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uint8_t ns3::TcpHeader::GetFlags ( ) const

Returns: the flags for this TcpHeader

Definition at line 108 of file tcp-header.cc.

References m_flags.

Referenced by ns3::TcpSocketBase::ProcessClosing(), ns3::TcpSocketBase::ProcessEstablished(), ns3::TcpSocketBase::ProcessLastAck(), ns3::TcpSocketBase::ProcessListen(), ns3::TcpSocketBase::ProcessSynRcvd(), ns3::TcpSocketBase::ProcessSynSent(), ns3::TcpSocketBase::ProcessWait(), ns3::TcpL4Protocol::Receive(), ns3::TcpSocketBase::ReceivedAck(), ns3::TcpSocketBase::ReceivedData(), and ns3::TcpL4Protocol::SendPacket().

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TypeId ns3::TcpHeader::GetInstanceTypeId ( void ) const

virtual

Returns: the TypeId associated to the most-derived type of this instance.

This method is typically implemented by ns3::Object::GetInstanceTypeId but some classes which derive from ns3::ObjectBase directly have to implement it themselves.

Implements ns3::ObjectBase.

Definition at line 210 of file tcp-header.cc.

References GetTypeId().

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uint8_t ns3::TcpHeader::GetLength ( ) const

Returns: the length of this TcpHeader

Definition at line 104 of file tcp-header.cc.

References m_length.

SequenceNumber32 ns3::TcpHeader::GetSequenceNumber ( void ) const

Returns: the sequence number for this TcpHeader

Definition at line 96 of file tcp-header.cc.

References m_sequenceNumber.

Referenced by ns3::TcpRxBuffer::Add(), ns3::TcpSocketBase::CompleteFork(), ns3::TcpSocketBase::PeerClose(), ns3::TcpSocketBase::ProcessClosing(), ns3::TcpSocketBase::ProcessLastAck(), ns3::TcpSocketBase::ProcessSynRcvd(), ns3::TcpSocketBase::ProcessSynSent(), ns3::TcpSocketBase::ProcessWait(), ns3::TcpL4Protocol::Receive(), ns3::TcpSocketBase::ReceivedData(), and ns3::TcpL4Protocol::SendPacket().

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uint32_t ns3::TcpHeader::GetSerializedSize ( void ) const

virtual

Returns: the expected size of the header.

This method is used by Packet::AddHeader to store a header into the byte buffer of a packet. This method should return the number of bytes which are needed to store the full header data by Serialize.

Implements ns3::Header.

Definition at line 256 of file tcp-header.cc.

References m_length.

Referenced by Deserialize().

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uint16_t ns3::TcpHeader::GetSourcePort ( ) const

Returns: The source port for this TcpHeader

Definition at line 88 of file tcp-header.cc.

References m_sourcePort.

Referenced by ns3::IpcsClassifier::Classify(), ns3::Ipv4FlowClassifier::Classify(), ns3::EpcTftClassifier::Classify(), and ns3::TcpL4Protocol::Receive().

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TypeId ns3::TcpHeader::GetTypeId ( void )

static

This method returns the TypeId associated to ns3::TcpHeader.

No Attributes defined for this type.
No TraceSources defined for this type.

Reimplemented from ns3::Header.

Definition at line 201 of file tcp-header.cc.

References ns3::TypeId::SetParent().

Referenced by GetInstanceTypeId().

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uint16_t ns3::TcpHeader::GetUrgentPointer ( ) const

Returns: the urgent pointer for this TcpHeader

Definition at line 116 of file tcp-header.cc.

References m_urgentPointer.

uint16_t ns3::TcpHeader::GetWindowSize ( ) const

Returns: the window size for this TcpHeader

Definition at line 112 of file tcp-header.cc.

References m_windowSize.

void ns3::TcpHeader::InitializeChecksum	(	Ipv4Address	source,
		Ipv4Address	destination,
		uint8_t	protocol
	)

Parameters

source	the ip source to use in the underlying ip packet.
destination	the ip destination to use in the underlying ip packet.
protocol	the protocol number to use in the underlying ip packet.

If you want to use tcp checksums, you should call this method prior to adding the header to a packet.

Definition at line 122 of file tcp-header.cc.

References m_destination, m_protocol, and m_source.

Referenced by ns3::TcpL4Protocol::Receive(), ns3::TcpL4Protocol::Send(), and ns3::TcpL4Protocol::SendPacket().

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void ns3::TcpHeader::InitializeChecksum	(	Ipv6Address	source,
		Ipv6Address	destination,
		uint8_t	protocol
	)

Definition at line 132 of file tcp-header.cc.

References m_destination, m_protocol, and m_source.

void ns3::TcpHeader::InitializeChecksum	(	Address	source,
		Address	destination,
		uint8_t	protocol
	)

Definition at line 142 of file tcp-header.cc.

References m_destination, m_protocol, and m_source.

bool ns3::TcpHeader::IsChecksumOk ( void ) const

Is the TCP checksum correct ?

Returns: true if the checksum is correct, false otherwise.

Definition at line 195 of file tcp-header.cc.

References m_goodChecksum.

Referenced by ns3::TcpL4Protocol::Receive().

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void ns3::TcpHeader::Print ( std::ostream & os ) const

virtual

Parameters

os output stream This method is used by Packet::Print to print the content of a trailer as ascii data to a c++ output stream. Although the trailer is free to format its output as it wishes, it is recommended to follow a few rules to integrate with the packet pretty printer: start with flags, small field values located between a pair of parens. Values should be separated by whitespace. Follow the parens with the important fields, separated by whitespace. i.e.: (field1 val1 field2 val2 field3 val3) field4 val4 field5 val5

Implements ns3::Header.

Definition at line 214 of file tcp-header.cc.

References ACK, CWR, ECE, FIN, m_ackNumber, m_destinationPort, m_flags, m_sequenceNumber, m_sourcePort, m_windowSize, PSH, RST, SYN, and URG.

void ns3::TcpHeader::Serialize ( Buffer::Iterator start ) const

virtual

Parameters

start an iterator which points to where the header should be written.

This method is used by Packet::AddHeader to store a header into the byte buffer of a packet. The data written is expected to match bit-for-bit the representation of this header in a real network.

Implements ns3::Header.

Definition at line 260 of file tcp-header.cc.

References CalculateHeaderChecksum(), ns3::Buffer::Iterator::GetSize(), ns3::SequenceNumber< NUMERIC_TYPE, SIGNED_TYPE >::GetValue(), m_ackNumber, m_calcChecksum, m_destinationPort, m_flags, m_length, m_sequenceNumber, m_sourcePort, m_urgentPointer, m_windowSize, visualizer.core::start(), ns3::Buffer::Iterator::WriteHtonU16(), and ns3::Buffer::Iterator::WriteHtonU32().