Ipv4QueueDiscItem is a subclass of QueueDiscItem which stores IPv4 packets. More...

#include "ipv4-queue-disc-item.h"

Inheritance diagram for ns3::Ipv4QueueDiscItem:

Collaboration diagram for ns3::Ipv4QueueDiscItem:

Public Member Functions
	Ipv4QueueDiscItem ()=delete

	Ipv4QueueDiscItem (const Ipv4QueueDiscItem &)=delete

	Ipv4QueueDiscItem (Ptr< Packet > p, const Address &addr, uint16_t protocol, const Ipv4Header &header)
	Create an IPv4 queue disc item containing an IPv4 packet.

	~Ipv4QueueDiscItem () override

void	AddHeader () override
	Add the header to the packet.

const Ipv4Header &	GetHeader () const

uint32_t	GetSize () const override

bool	GetUint8Value (Uint8Values field, uint8_t &value) const override
	Retrieve the value of a given field from the packet, if present.

uint32_t	Hash (uint32_t perturbation) const override
	Computes the hash of the packet's 5-tuple.

bool	Mark () override
	Marks the packet by setting ECN_CE bits if the packet has ECN_ECT0 or ECN_ECT1 set.

Ipv4QueueDiscItem &	operator= (const Ipv4QueueDiscItem &)=delete

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

Public Member Functions inherited from ns3::QueueDiscItem
	QueueDiscItem ()=delete

	QueueDiscItem (const QueueDiscItem &)=delete

	QueueDiscItem (Ptr< Packet > p, const Address &addr, uint16_t protocol)
	Create a queue disc item.

	~QueueDiscItem () override

virtual void	AddHeader ()=0
	Add the header to the packet.

Address	GetAddress () const
	Get the MAC address included in this item.

uint16_t	GetProtocol () const
	Get the L3 protocol included in this item.

Time	GetTimeStamp () const
	Get the timestamp included in this item.

uint8_t	GetTxQueueIndex () const
	Get the transmission queue index included in this item.

virtual uint32_t	Hash (uint32_t perturbation=0) const
	Computes the hash of various fields of the packet header.

virtual bool	Mark ()=0
	Marks the packet as a substitute for dropping it, such as for Explicit Congestion Notification.

QueueDiscItem &	operator= (const QueueDiscItem &)=delete

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

void	SetTimeStamp (Time t)
	Set the timestamp included in this item.

void	SetTxQueueIndex (uint8_t txq)
	Set the transmission queue index to store in this item.

Public Member Functions inherited from ns3::QueueItem
	QueueItem ()=delete

	QueueItem (const QueueItem &)=delete

	QueueItem (Ptr< Packet > p)
	Create a queue item containing a packet.

virtual	~QueueItem ()

Ptr< Packet >	GetPacket () const

virtual uint32_t	GetSize () const
	Use this method (instead of GetPacket ()->GetSize ()) to get the packet size.

virtual bool	GetUint8Value (Uint8Values field, uint8_t &value) const
	Retrieve the value of a given field from the packet, if present.

QueueItem &	operator= (const QueueItem &)=delete

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

Public Member Functions inherited from ns3::SimpleRefCount< QueueItem >
	SimpleRefCount ()
	Default constructor.

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

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

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

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

Private Attributes
Ipv4Header	m_header
	The IPv4 header.

bool	m_headerAdded
	True if the header has already been added to the packet.

Additional Inherited Members
Public Types inherited from ns3::QueueItem
typedef void(*	TracedCallback) (Ptr< const QueueItem > item)
	TracedCallback signature for Ptr<QueueItem>

enum	Uint8Values { IP_DSFIELD }
	1-byte fields of the packet whose value can be retrieved, if present More...

Detailed Description

Ipv4QueueDiscItem is a subclass of QueueDiscItem which stores IPv4 packets.

Header and payload are kept separate to allow the queue disc to manipulate the header, which is added to the packet when the packet is dequeued.

Definition at line 37 of file ipv4-queue-disc-item.h.

Constructor & Destructor Documentation

◆ Ipv4QueueDiscItem() [1/3]

ns3::Ipv4QueueDiscItem::Ipv4QueueDiscItem	(	Ptr< Packet >	p,
		const Address &	addr,
		uint16_t	protocol,
		const Ipv4Header &	header
	)

Create an IPv4 queue disc item containing an IPv4 packet.

Parameters

p	the packet included in the created item.
addr	the destination MAC address
protocol	the protocol number
header	the IPv4 header

Definition at line 30 of file ipv4-queue-disc-item.cc.

◆ ~Ipv4QueueDiscItem()

ns3::Ipv4QueueDiscItem::~Ipv4QueueDiscItem ( )

override

Definition at line 40 of file ipv4-queue-disc-item.cc.

References NS_LOG_FUNCTION.

◆ Ipv4QueueDiscItem() [2/3]

ns3::Ipv4QueueDiscItem::Ipv4QueueDiscItem ( )

delete

◆ Ipv4QueueDiscItem() [3/3]

ns3::Ipv4QueueDiscItem::Ipv4QueueDiscItem ( const Ipv4QueueDiscItem & )

delete

Member Function Documentation

◆ AddHeader()

void ns3::Ipv4QueueDiscItem::AddHeader ( )

overridevirtual

Add the header to the packet.

Implements ns3::QueueDiscItem.

Definition at line 66 of file ipv4-queue-disc-item.cc.

References ns3::QueueItem::GetPacket(), m_header, m_headerAdded, NS_ASSERT, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

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◆ GetHeader()

const Ipv4Header & ns3::Ipv4QueueDiscItem::GetHeader ( ) const

Returns: the header stored in this item..

Definition at line 60 of file ipv4-queue-disc-item.cc.

References m_header.

Referenced by UdpSocketImplTest::GetTos().

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◆ GetSize()

uint32_t ns3::Ipv4QueueDiscItem::GetSize ( ) const

overridevirtual

Returns: the correct packet size (header plus payload).

Reimplemented from ns3::QueueItem.

Definition at line 46 of file ipv4-queue-disc-item.cc.

References ns3::QueueItem::GetPacket(), ns3::Ipv4Header::GetSerializedSize(), m_header, m_headerAdded, NS_ASSERT, and NS_LOG_FUNCTION.

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◆ GetUint8Value()

bool ns3::Ipv4QueueDiscItem::GetUint8Value	(	QueueItem::Uint8Values	field,
		uint8_t &	value
	)		const

overridevirtual

Retrieve the value of a given field from the packet, if present.

Parameters

field	the field whose value has to be retrieved
value	the output parameter to store the retrieved value

Returns: true if the requested field is present in the packet, false otherwise.

Reimplemented from ns3::QueueItem.

Definition at line 103 of file ipv4-queue-disc-item.cc.

References ns3::Ipv4Header::GetTos(), ns3::QueueItem::IP_DSFIELD, and m_header.

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◆ Hash()

uint32_t ns3::Ipv4QueueDiscItem::Hash ( uint32_t perturbation ) const

overridevirtual

Computes the hash of the packet's 5-tuple.

Computes the hash of the source and destination IP addresses, protocol number and, if the transport protocol is either UDP or TCP, the source and destination port

Parameters

perturbation hash perturbation value