Defines the TCP option of kind 8 (timestamp option) as in RFC 1323 More...

#include "tcp-option-ts.h"

Inheritance diagram for ns3::TcpOptionTS:

Collaboration diagram for ns3::TcpOptionTS:

Public Member Functions
	TcpOptionTS ()

	~TcpOptionTS () override

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

uint32_t	GetEcho () const
	Get the timestamp echo stored in the Option. More...

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object. More...

uint8_t	GetKind () const override
	Get the ‘kind’ (as in RFC 793) of this option. More...

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

uint32_t	GetTimestamp () const
	Get the timestamp stored in the Option. More...

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

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

void	SetEcho (uint32_t ts)
	Set the timestamp echo stored in the Option. More...

void	SetTimestamp (uint32_t ts)
	Set the timestamp stored in the Option. More...

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

	~TcpOption () override

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object. More...

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor. More...

	~Object () override
	Destructor. More...

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together. More...

void	Dispose ()
	Dispose of this Object. More...

AggregateIterator	GetAggregateIterator () const
	Get an iterator to the Objects aggregated to this one. More...

template<typename T >
Ptr< T >	GetObject () const
	Get a pointer to the requested aggregated Object. More...

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object. More...

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId. More...

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object. More...

void	Initialize ()
	Invoke DoInitialize on all Objects aggregated to this one. More...

bool	IsInitialized () const
	Check if the object has been initialized. More...

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

	SimpleRefCount (const SimpleRefCount &o[[maybe_unused]])
	Copy constructor. More...

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

SimpleRefCount &	operator= (const SimpleRefCount &o[[maybe_unused]])
	Assignment operator. More...

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

void	Unref () 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
	Get the value of an attribute, raising fatal errors if unsuccessful. More...

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising errors. More...

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful. More...

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors. More...

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context. More...

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context. More...

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context. More...

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context. More...

Static Public Member Functions
static Time	ElapsedTimeFromTsValue (uint32_t echoTime)
	Estimate the Time elapsed from a TS echo value. More...

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

static uint32_t	NowToTsValue ()
	Return an uint32_t value which represent "now". More...

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

static TypeId	GetTypeId ()
	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 ()
	Register this type. More...

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

Protected Attributes
uint32_t	m_echo
	echo timestamp More...

uint32_t	m_timestamp
	local timestamp More...

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. More...

virtual void	DoDispose ()
	Destructor implementation. More...

virtual void	DoInitialize ()
	Initialize() implementation. More...

virtual void	NotifyNewAggregate ()
	Notify all Objects aggregated to this one of a new Object being aggregated. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes. More...

virtual void	NotifyConstructionCompleted ()
	Notifier called once the ObjectBase is fully constructed. More...

Related Functions inherited from ns3::ObjectBase
static TypeId	GetObjectIid ()
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More...

Detailed Description

Defines the TCP option of kind 8 (timestamp option) as in RFC 1323

Definition at line 36 of file tcp-option-ts.h.

Constructor & Destructor Documentation

◆ TcpOptionTS()

ns3::TcpOptionTS::TcpOptionTS ( )

Definition at line 31 of file tcp-option-ts.cc.

◆ ~TcpOptionTS()

ns3::TcpOptionTS::~TcpOptionTS ( )

override

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

Member Function Documentation

◆ Deserialize()

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

overridevirtual

Deserialize the Option from a buffer iterator.

Parameters

start the buffer iterator

Returns: the number of deserialized bytes

Implements ns3::TcpOption.

Definition at line 81 of file tcp-option-ts.cc.

References GetKind(), GetSerializedSize(), m_echo, m_timestamp, NS_LOG_WARN, ns3::Buffer::Iterator::ReadNtohU32(), ns3::Buffer::Iterator::ReadU8(), and two-ray-to-three-gpp-ch-calibration::start.

Referenced by TcpOptionTSTestCase::TestDeserialize().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ ElapsedTimeFromTsValue()

Time ns3::TcpOptionTS::ElapsedTimeFromTsValue ( uint32_t echoTime )

static

Estimate the Time elapsed from a TS echo value.

The echoTime should be a value returned from NowToTsValue.

Parameters

echoTime Echoed value from other side

See also: NowToTsValue

Returns: The measured RTT

Definition at line 144 of file tcp-option-ts.cc.

References ns3::Time::GetMilliSeconds(), ns3::MilliSeconds(), ns3::Simulator::Now(), and ns3::Seconds().

Referenced by ns3::TcpSocketBase::EstimateRtt().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ GetEcho()

uint32_t ns3::TcpOptionTS::GetEcho ( ) const

Get the timestamp echo stored in the Option.

Returns: the timestamp echo

Definition at line 116 of file tcp-option-ts.cc.

References m_echo.

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

Here is the caller graph for this function:

◆ GetInstanceTypeId()

TypeId ns3::TcpOptionTS::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-ts.cc.

References GetTypeId().

Here is the call graph for this function:

◆ GetKind()

uint8_t ns3::TcpOptionTS::GetKind ( ) const

overridevirtual

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

Returns: the Option Kind

Implements ns3::TcpOption.

Definition at line 104 of file tcp-option-ts.cc.

References ns3::TcpOption::TS.

Referenced by Deserialize(), and Serialize().

Here is the caller graph for this function:

◆ GetSerializedSize()

uint32_t ns3::TcpOptionTS::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-ts.cc.

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

Here is the caller graph for this function:

◆ GetTimestamp()

uint32_t ns3::TcpOptionTS::GetTimestamp ( ) const

Get the timestamp stored in the Option.

Returns: the timestamp

Definition at line 110 of file tcp-option-ts.cc.

References m_timestamp.

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

Here is the caller graph for this function:

◆ GetTypeId()

TypeId ns3::TcpOptionTS::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

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

References ns3::TypeId::SetParent().

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

Here is the call graph for this function:

Here is the caller graph for this function:

◆ NowToTsValue()

uint32_t ns3::TcpOptionTS::NowToTsValue ( )

static

Return an uint32_t value which represent "now".

The value returned is usually used as Timestamp option for the TCP header; when the value will be echoed back, calculating the RTT will be an easy matter.

The RFC does not mention any units for this value; following what is implemented in OS, we use milliseconds. Any change to this must be reflected to EstimateRttFromTs.