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ns3::TcpOptionWinScale Class Reference

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 ()
 
 ~TcpOptionWinScale () override
 
uint32_t Deserialize (Buffer::Iterator start) override
 Deserialize the Option from a buffer iterator.
 
TypeId GetInstanceTypeId () const override
 Get the most derived TypeId for this Object.
 
uint8_t GetKind () const override
 Get the ‘kind’ (as in RFC 793) of this option.
 
uint8_t GetScale () const
 Get the scale value (uint8_t)
 
uint32_t GetSerializedSize () const override
 Returns number of bytes required for Option serialization.
 
void Print (std::ostream &os) const override
 Print the Option contents.
 
void Serialize (Buffer::Iterator start) const override
 Serialize the Option to a buffer iterator.
 
void SetScale (uint8_t scale)
 Set the scale option.
 
- Public Member Functions inherited from ns3::TcpOption
 TcpOption ()
 
 ~TcpOption () override
 
virtual uint32_t Deserialize (Buffer::Iterator start)=0
 Deserialize the Option from a buffer iterator.
 
TypeId GetInstanceTypeId () const override
 Get the most derived TypeId for this Object.
 
virtual uint8_t GetKind () const =0
 Get the ‘kind’ (as in RFC 793) of this option.
 
virtual uint32_t GetSerializedSize () const =0
 Returns number of bytes required for Option serialization.
 
virtual void Print (std::ostream &os) const =0
 Print the Option contents.
 
virtual void Serialize (Buffer::Iterator start) const =0
 Serialize the Option to a buffer iterator.
 
- Public Member Functions inherited from ns3::Object
 Object ()
 Constructor.
 
 ~Object () override
 Destructor.
 
void AggregateObject (Ptr< Object > other)
 Aggregate two Objects together.
 
void Dispose ()
 Dispose of this Object.
 
AggregateIterator GetAggregateIterator () const
 Get an iterator to the Objects aggregated to this one.
 
TypeId GetInstanceTypeId () const override
 Get the most derived TypeId for this Object.
 
template<typename T >
Ptr< T > GetObject () const
 Get a pointer to the requested aggregated Object.
 
template<>
Ptr< ObjectGetObject () const
 Specialization of () for objects of type ns3::Object.
 
template<typename T >
Ptr< T > GetObject (TypeId tid) const
 Get a pointer to the requested aggregated Object by TypeId.
 
template<>
Ptr< ObjectGetObject (TypeId tid) const
 Specialization of (TypeId tid) for objects of type ns3::Object.
 
void Initialize ()
 Invoke DoInitialize on all Objects aggregated to this one.
 
bool IsInitialized () const
 Check if the object has been initialized.
 
- Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
 SimpleRefCount ()
 Default constructor.
 
 SimpleRefCount (const SimpleRefCount &o)
 Copy constructor.
 
uint32_t GetReferenceCount () const
 Get the reference count of the object.
 
SimpleRefCountoperator= (const SimpleRefCount &o)
 Assignment operator.
 
void Ref () const
 Increment the reference count.
 
void Unref () const
 Decrement the reference count.
 
- Public Member Functions inherited from ns3::ObjectBase
virtual ~ObjectBase ()
 Virtual destructor.
 
void GetAttribute (std::string name, AttributeValue &value) const
 Get the value of an attribute, raising fatal errors if unsuccessful.
 
bool GetAttributeFailSafe (std::string name, AttributeValue &value) const
 Get the value of an attribute without raising errors.
 
virtual TypeId GetInstanceTypeId () const =0
 Get the most derived TypeId for this Object.
 
void SetAttribute (std::string name, const AttributeValue &value)
 Set a single attribute, raising fatal errors if unsuccessful.
 
bool SetAttributeFailSafe (std::string name, const AttributeValue &value)
 Set a single attribute without raising errors.
 
bool TraceConnect (std::string name, std::string context, const CallbackBase &cb)
 Connect a TraceSource to a Callback with a context.
 
bool TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
 Connect a TraceSource to a Callback without a context.
 
bool TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected with a context.
 
bool TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected without a context.
 

Static Public Member Functions

static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::TcpOption
static Ptr< TcpOptionCreateOption (uint8_t kind)
 Creates an option.
 
static TypeId GetTypeId ()
 Get the type ID.
 
static bool IsKindKnown (uint8_t kind)
 Check if the option is implemented.
 
- Static Public Member Functions inherited from ns3::Object
static TypeId GetTypeId ()
 Register this type.
 
- Static Public Member Functions inherited from ns3::ObjectBase
static TypeId GetTypeId ()
 Get the type ID.
 

Protected Attributes

uint8_t m_scale
 Window scaling in number of bit shift.
 

Additional Inherited Members

- Public Types inherited from ns3::TcpOption
enum  Kind {
  END = 0 , NOP = 1 , MSS = 2 , WINSCALE = 3 ,
  SACKPERMITTED = 4 , SACK = 5 , 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)
 Copy an Object.
 
virtual void DoDispose ()
 Destructor implementation.
 
virtual void DoInitialize ()
 Initialize() implementation.
 
virtual void NotifyNewAggregate ()
 Notify all Objects aggregated to this one of a new Object being aggregated.
 
- Protected Member Functions inherited from ns3::ObjectBase
void ConstructSelf (const AttributeConstructionList &attributes)
 Complete construction of ObjectBase; invoked by derived classes.
 
virtual void NotifyConstructionCompleted ()
 Notifier called once the ObjectBase is fully constructed.
 

Detailed Description

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

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.
Size of this type is 32 bytes (on a 64-bit architecture).

Definition at line 50 of file tcp-option-winscale.h.

Constructor & Destructor Documentation

◆ TcpOptionWinScale()

ns3::TcpOptionWinScale::TcpOptionWinScale ( )

Definition at line 32 of file tcp-option-winscale.cc.

◆ ~TcpOptionWinScale()

ns3::TcpOptionWinScale::~TcpOptionWinScale ( )
override

Definition at line 38 of file tcp-option-winscale.cc.

Member Function Documentation

◆ Deserialize()

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

Deserialize the Option from a buffer iterator.

Parameters
startthe buffer iterator
Returns
the number of deserialized bytes

Implements ns3::TcpOption.

Definition at line 80 of file tcp-option-winscale.cc.

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

Referenced by TcpOptionWSTestCase::TestDeserialize().

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◆ GetInstanceTypeId()

TypeId ns3::TcpOptionWinScale::GetInstanceTypeId ( ) const
overridevirtual

Get the most derived TypeId for this Object.

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

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

Reimplemented from ns3::Object.

Definition at line 53 of file tcp-option-winscale.cc.

References GetTypeId().

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◆ GetKind()

uint8_t ns3::TcpOptionWinScale::GetKind ( ) const
overridevirtual

Get the ‘kind’ (as in RFC 793) of this option.

Returns
the Option Kind

Implements ns3::TcpOption.

Definition at line 101 of file tcp-option-winscale.cc.

References ns3::TcpOption::WINSCALE.

Referenced by Deserialize(), and Serialize().

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◆ GetScale()

uint8_t ns3::TcpOptionWinScale::GetScale ( ) const

Get the scale value (uint8_t)

Returns
The scale value

Definition at line 107 of file tcp-option-winscale.cc.

References m_scale, and NS_ASSERT.

Referenced by TcpOptionWSTestCase::TestDeserialize(), and TcpOptionWSTestCase::TestSerialize().

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◆ GetSerializedSize()

uint32_t ns3::TcpOptionWinScale::GetSerializedSize ( ) const
overridevirtual

Returns number of bytes required for Option serialization.

Returns
number of bytes required for Option serialization

Implements ns3::TcpOption.

Definition at line 65 of file tcp-option-winscale.cc.

Referenced by Deserialize(), and TcpOptionWSTestCase::TestSerialize().

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◆ GetTypeId()

TypeId ns3::TcpOptionWinScale::GetTypeId ( )
static

Get the type ID.

Returns
the object TypeId

Definition at line 43 of file tcp-option-winscale.cc.

References ns3::TypeId::SetParent().

Referenced by ns3::TcpOption::CreateOption(), and GetInstanceTypeId().

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◆ Print()

void ns3::TcpOptionWinScale::Print ( std::ostream &  os) const
overridevirtual

Print the Option contents.

Parameters
osthe output stream

Implements ns3::TcpOption.

Definition at line 59 of file tcp-option-winscale.cc.

References m_scale.

◆ Serialize()

void ns3::TcpOptionWinScale::Serialize ( Buffer::Iterator  start) const
overridevirtual

Serialize the Option to a buffer iterator.

Parameters
startthe buffer iterator

Implements ns3::TcpOption.

Definition at line 71 of file tcp-option-winscale.cc.

References GetKind(), m_scale, and ns3::Buffer::Iterator::WriteU8().

Referenced by TcpOptionWSTestCase::TestSerialize().

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◆ SetScale()

void ns3::TcpOptionWinScale::SetScale ( uint8_t  scale)

Set the scale option.

The scale option SHOULD be <= 14 (as RFC 1323).

Parameters
scaleScale factor

Definition at line 115 of file tcp-option-winscale.cc.

References m_scale, and NS_ASSERT.

Referenced by TcpOptionWSTestCase::TestSerialize().

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Member Data Documentation

◆ m_scale

uint8_t ns3::TcpOptionWinScale::m_scale
protected

Window scaling in number of bit shift.

Definition at line 86 of file tcp-option-winscale.h.

Referenced by Deserialize(), GetScale(), Print(), Serialize(), and SetScale().


The documentation for this class was generated from the following files: