Defines the TCP option of kind 3 (window scale option) as in RFC 1323 More...

#include <tcp-option-winscale.h>

Inheritance diagram for ns3::TcpOptionWinScale:

Collaboration diagram for ns3::TcpOptionWinScale:

Public Member Functions
	TcpOptionWinScale ()

virtual	~TcpOptionWinScale ()

virtual uint32_t	Deserialize (Buffer::Iterator start)
	Deserialize the Option from a buffer iterator. More...

virtual TypeId	GetInstanceTypeId (void) const

virtual uint8_t	GetKind (void) const
	Get the `kind' (as in RFC 793) of this option. More...

uint8_t	GetScale (void) const
	Get the scale value (uint8_t) More...

virtual uint32_t	GetSerializedSize (void) const
	Returns number of bytes required for Option serialization. More...

virtual void	Print (std::ostream &os) const
	Print the Option contents. More...

virtual void	Serialize (Buffer::Iterator start) const
	Serialize the Option to a buffer iterator. More...

void	SetScale (uint8_t scale)
	Set the scale option. More...

Public Member Functions inherited from ns3::TcpOption
	TcpOption ()

virtual	~TcpOption ()

Public Member Functions inherited from ns3::Object
	Object ()

virtual	~Object ()

void	AggregateObject (Ptr< Object > other)

void	Dispose (void)
	Run the DoDispose methods of this object and all the objects aggregated to it. More...

AggregateIterator	GetAggregateIterator (void) const

template<typename T >
Ptr< T >	GetObject (void) const

template<typename T >
Ptr< T >	GetObject (TypeId tid) const

void	Initialize (void)
	This method calls the virtual DoInitialize method on all the objects aggregated to this object. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor. More...

void	GetAttribute (std::string name, AttributeValue &value) const

bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const

void	SetAttribute (std::string name, const AttributeValue &value)

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)
	Get the type ID. More...

Static Public Member Functions inherited from ns3::TcpOption
static Ptr< TcpOption >	CreateOption (uint8_t kind)
	Creates an option. More...

static TypeId	GetTypeId (void)
	Get the type ID. More...

static bool	IsKindKnown (uint8_t kind)
	Check if the option is implemented. More...

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
static void	Cleanup (void)
	Noop. More...

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId (void)
	Get the type ID. More...

Protected Attributes
uint8_t	m_scale
	Window scaling in number of bit shift. More...

Additional Inherited Members
Public Types inherited from ns3::TcpOption
enum	Kind { END = 0, NOP = 1, MSS = 2, WINSCALE = 3, TS = 8, UNKNOWN = 255 }
	The option Kind, as defined in the respective RFCs. More...

Protected Member Functions inherited from ns3::Object
	Object (const Object &o)

virtual void	DoDispose (void)
	This method is called by Object::Dispose or by the object's destructor, whichever comes first. More...

virtual void	DoInitialize (void)
	This method is called only once by Object::Initialize. More...

virtual void	NotifyNewAggregate (void)
	This method is invoked whenever two sets of objects are aggregated together. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)

virtual void	NotifyConstructionCompleted (void)
	This method is invoked once all member attributes have been initialized. More...

Detailed Description

Defines the TCP option of kind 3 (window scale option) as in RFC 1323

Doxygen introspection did not find any typical Config paths.

For more efficient use of high bandwidth networks, a larger TCP window size may be used. The TCP window size field controls the flow of data and its value is limited to between 2 and 65,535 bytes.

Since the size field cannot be expanded, a scaling factor is used. The TCP window scale option, as defined in RFC 1323, is an option used to increase the maximum window size from 65,535 bytes to 1 gigabyte. Scaling up to larger window sizes is a part of what is necessary for TCP Tuning.

The window scale option is used only during the TCP 3-way handshake. The window scale value represents the number of bits to left-shift the 16-bit window size field. The window scale value can be set from 0 (no shift) to 14 for each direction independently. Both sides must send the option in their SYN segments to enable window scaling in either direction.

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

Definition at line 48 of file tcp-option-winscale.h.

Constructor & Destructor Documentation

ns3::TcpOptionWinScale::TcpOptionWinScale ( )

Definition at line 30 of file tcp-option-winscale.cc.

ns3::TcpOptionWinScale::~TcpOptionWinScale ( )

virtual

Definition at line 36 of file tcp-option-winscale.cc.

Member Function Documentation

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

virtual

Deserialize the Option from a buffer iterator.

Parameters

start the buffer iterator

Returns: the number of deserialized bytes

Implements ns3::TcpOption.

Definition at line 78 of file tcp-option-winscale.cc.

References GetKind(), GetSerializedSize(), m_scale, NS_LOG_WARN, ns3::Buffer::Iterator::ReadU8(), and visualizer.core::start().

Referenced by ns3::TcpOptionWSTestCase::TestDeserialize().

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TypeId ns3::TcpOptionWinScale::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.

Reimplemented from ns3::TcpOption.

Definition at line 51 of file tcp-option-winscale.cc.

References GetTypeId().

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