Information element, as defined in 802.11-2007 standard. More...

#include "wifi-information-element.h"

Inheritance diagram for ns3::WifiInformationElement:

Collaboration diagram for ns3::WifiInformationElement:

Public Member Functions
virtual	~WifiInformationElement ()

Buffer::Iterator	Deserialize (Buffer::Iterator i)
	Deserialize entire IE (which may possibly be fragmented into multiple elements), which must be present.

Buffer::Iterator	DeserializeIfPresent (Buffer::Iterator i)
	Deserialize entire IE (which may possibly be fragmented into multiple elements) if it is present.

virtual WifiInformationElementId	ElementId () const =0
	Get the wifi information element ID.

virtual WifiInformationElementId	ElementIdExt () const
	Get the wifi information element ID extension.

uint16_t	GetSerializedSize () const
	Get the size of the serialized IE including Element ID and length fields (for every element this IE is possibly fragmented into).

virtual bool	operator== (const WifiInformationElement &a) const
	Compare two IEs for equality by ID & Length, and then through memcmp of serialised version.

virtual void	Print (std::ostream &os) const
	Generate human-readable form of IE.

Buffer::Iterator	Serialize (Buffer::Iterator i) const
	Serialize entire IE including Element ID and length fields.

Public Member Functions inherited from ns3::SimpleRefCount< WifiInformationElement >
	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 Member Functions
virtual uint16_t	DeserializeInformationField (Buffer::Iterator start, uint16_t length)=0
	Deserialize information (i.e., the body of the IE, not including the Element ID and length octets)

Buffer::Iterator	DoDeserialize (Buffer::Iterator i, uint16_t length)
	Deserialize the Information field of an IE.

virtual uint16_t	GetInformationFieldSize () const =0
	Length of serialized information (i.e., the length of the body of the IE, not including the Element ID and length octets.

Buffer::Iterator	SerializeFragments (Buffer::Iterator i, uint16_t size) const
	Serialize an IE that needs to be fragmented.

virtual void	SerializeInformationField (Buffer::Iterator start) const =0
	Serialize information (i.e., the body of the IE, not including the Element ID and length octets)

Detailed Description

Information element, as defined in 802.11-2007 standard.

The IEEE 802.11 standard includes the notion of Information Elements, which are encodings of management information to be communicated between STAs in the payload of various frames of type Management. Information Elements (IEs) have a common format, each starting with a single octet - the Element ID, which indicates the specific type of IE (a type to represent the options here is defined as WifiInformationElementId). The next octet is a length field and encodes the number of octets in the third and final field, which is the IE Information field.

The class ns3::WifiInformationElement provides a base for classes which represent specific Information Elements. This class defines pure virtual methods for serialisation (ns3::WifiInformationElement::SerializeInformationField) and deserialisation (ns3::WifiInformationElement::DeserializeInformationField) of IEs, from or to data members or other objects that simulation objects use to maintain the relevant state.

This class also provides an implementation of the equality operator, which operates by comparing the serialised versions of the two WifiInformationElement objects concerned.

Elements are defined to have a common general format consisting of a 1 octet Element ID field, a 1 octet length field, and a variable-length element-specific information field. Each element is assigned a unique Element ID as defined in this standard. The Length field specifies the number of octets in the Information field.

Fragmentation of an Information Element is handled transparently by the base class. Subclasses can simply serialize/deserialize their data into/from a single large buffer. It is the base class that takes care of splitting serialized data into multiple fragments (when serializing) or reconstructing data from multiple fragments when deserializing.

This class is pure virtual and acts as base for classes which know how to serialize specific IEs.

Definition at line 286 of file wifi-information-element.h.

Constructor & Destructor Documentation

◆ ~WifiInformationElement()

ns3::WifiInformationElement::~WifiInformationElement ( )

virtual

Definition at line 25 of file wifi-information-element.cc.

Member Function Documentation

◆ Deserialize()

Buffer::Iterator ns3::WifiInformationElement::Deserialize ( Buffer::Iterator i )

Deserialize entire IE (which may possibly be fragmented into multiple elements), which must be present.

The iterator passed in must be pointing at the Element ID (i.e., the very first octet) of the correct type of information element, otherwise this method will generate a fatal error.

Parameters

i	an iterator which points to where the IE should be read.

Returns: an iterator

Definition at line 132 of file wifi-information-element.cc.

References DeserializeIfPresent(), ns3::Buffer::Iterator::GetDistanceFrom(), and NS_ASSERT.

Referenced by ns3::dot11s::PeerLinkOpenStart::Deserialize(), ns3::dot11s::PeerLinkConfirmStart::Deserialize(), and TestWifiInformationElement::DeserializeInformationField().

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◆ DeserializeIfPresent()

Buffer::Iterator ns3::WifiInformationElement::DeserializeIfPresent ( Buffer::Iterator i )

Deserialize entire IE (which may possibly be fragmented into multiple elements) if it is present.

The iterator passed in must be pointing at the Element ID of an information element. If the Element ID is not the one that the given class is interested in then it will return the same iterator.

Parameters

i	an iterator which points to where the IE should be read.

Returns: an iterator

Definition at line 143 of file wifi-information-element.cc.

References DoDeserialize(), ElementId(), ElementIdExt(), IE_EXTENSION, ns3::Buffer::Iterator::IsEnd(), and ns3::Buffer::Iterator::ReadU8().

Referenced by Deserialize(), ns3::MgtAddBaRequestHeader::Deserialize(), ns3::MgtAddBaResponseHeader::Deserialize(), and BasicMultiLinkElementTest::DoRun().

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◆ DeserializeInformationField()

virtual uint16_t ns3::WifiInformationElement::DeserializeInformationField	(	Buffer::Iterator	start,
		uint16_t	length
	)

privatepure virtual

Deserialize information (i.e., the body of the IE, not including the Element ID and length octets)

Parameters

start	an iterator which points to where the information should be written.
length	the expected number of bytes to read

Returns: the number of bytes read

Implemented in ns3::dot11s::IeBeaconTiming, ns3::dot11s::IeConfiguration, ns3::dot11s::IePeerManagement, ns3::dot11s::IePeeringProtocol, ns3::dot11s::IePreq, ns3::dot11s::IeMeshId, ns3::dot11s::IeLinkMetricReport, ns3::dot11s::IePerr, ns3::dot11s::IePrep, ns3::dot11s::IeRann, ns3::AddbaExtension, ns3::EdcaParameterSet, ns3::EhtCapabilities, ns3::EhtOperation, ns3::MultiLinkElement, ns3::MultiLinkElement::PerStaProfileSubelement, ns3::TidToLinkMapping, ns3::ExtendedCapabilities, ns3::HeCapabilities, ns3::HeOperation, ns3::MuEdcaParameterSet, ns3::HtCapabilities, ns3::HtOperation, ns3::DsssParameterSet, ns3::ErpInformation, ns3::NonInheritance, ns3::ReducedNeighborReport, ns3::Ssid, ns3::SupportedRates, ns3::VhtCapabilities, ns3::VhtOperation, TestWifiSubElement, and TestWifiInformationElement.

Referenced by DoDeserialize().

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◆ DoDeserialize()

Buffer::Iterator ns3::WifiInformationElement::DoDeserialize	(	Buffer::Iterator	i,
		uint16_t	length
	)

private

Deserialize the Information field of an IE.

Also handle the case in which the IE is fragmented.

Parameters

i	an iterator which points to where the Information field should be read.
length	the expected number of bytes to read

Returns: an iterator pointing to past the IE that was deserialized

Definition at line 178 of file wifi-information-element.cc.

References ns3::Buffer::AddAtEnd(), ns3::Buffer::AddAtStart(), ns3::Buffer::Begin(), DeserializeInformationField(), ElementId(), IE_EXTENSION, IE_FRAGMENT, ns3::Buffer::Iterator::IsEnd(), ns3::Buffer::Iterator::Next(), NS_ASSERT, ns3::Buffer::Iterator::PeekU8(), ns3::Buffer::Iterator::ReadU8(), and ns3::Buffer::Iterator::WriteU8().

Referenced by DeserializeIfPresent().

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◆ ElementId()

virtual WifiInformationElementId ns3::WifiInformationElement::ElementId ( ) const

pure virtual

Get the wifi information element ID.

Returns: the wifi information element ID

Implemented in ns3::dot11s::IeBeaconTiming, ns3::dot11s::IeConfiguration, ns3::dot11s::IeMeshId, ns3::dot11s::IeLinkMetricReport, ns3::dot11s::IePeerManagement, ns3::dot11s::IePeeringProtocol, ns3::dot11s::IePerr, ns3::dot11s::IePrep, ns3::dot11s::IePreq, ns3::dot11s::IeRann, ns3::AddbaExtension, ns3::EdcaParameterSet, ns3::EhtCapabilities, ns3::EhtOperation, ns3::MultiLinkElement, ns3::MultiLinkElement::PerStaProfileSubelement, ns3::TidToLinkMapping, ns3::ExtendedCapabilities, ns3::HeCapabilities, ns3::HeOperation, ns3::MuEdcaParameterSet, ns3::HtCapabilities, ns3::HtOperation, ns3::DsssParameterSet, ns3::ErpInformation, ns3::NonInheritance, ns3::ReducedNeighborReport, ns3::Ssid, ns3::SupportedRates, ns3::ExtendedSupportedRatesIE, ns3::VhtCapabilities, ns3::VhtOperation, TestWifiSubElement, and TestWifiInformationElement.

Referenced by DeserializeIfPresent(), DoDeserialize(), operator==(), Serialize(), and SerializeFragments().

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◆ ElementIdExt()

WifiInformationElementId ns3::WifiInformationElement::ElementIdExt ( ) const

virtual

Get the wifi information element ID extension.

Returns: the wifi information element ID extension

Reimplemented in ns3::EhtCapabilities, ns3::EhtOperation, ns3::MultiLinkElement, ns3::TidToLinkMapping, ns3::HeCapabilities, ns3::HeOperation, ns3::MuEdcaParameterSet, ns3::NonInheritance, and TestWifiInformationElement.

Definition at line 55 of file wifi-information-element.cc.

Referenced by DeserializeIfPresent(), operator==(), Serialize(), and SerializeFragments().

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◆ GetInformationFieldSize()

virtual uint16_t ns3::WifiInformationElement::GetInformationFieldSize ( ) const

privatepure virtual

Length of serialized information (i.e., the length of the body of the IE, not including the Element ID and length octets.

This is the value that will appear in the second octet of the entire IE - the length field - if the IE is not fragmented)

Returns: the length of serialized information

Implemented in ns3::dot11s::IeBeaconTiming, ns3::dot11s::IeConfiguration, ns3::dot11s::IeMeshId, ns3::dot11s::IeLinkMetricReport, ns3::dot11s::IePeerManagement, ns3::dot11s::IePeeringProtocol, ns3::dot11s::IePerr, ns3::dot11s::IePrep, ns3::dot11s::IePreq, ns3::dot11s::IeRann, ns3::AddbaExtension, ns3::EdcaParameterSet, ns3::EhtCapabilities, ns3::EhtOperation, ns3::MultiLinkElement, ns3::MultiLinkElement::PerStaProfileSubelement, ns3::TidToLinkMapping, ns3::ExtendedCapabilities, ns3::HeCapabilities, ns3::HeOperation, ns3::MuEdcaParameterSet, ns3::HtCapabilities, ns3::HtOperation, ns3::DsssParameterSet, ns3::ErpInformation, ns3::NonInheritance, ns3::ReducedNeighborReport, ns3::Ssid, ns3::SupportedRates, ns3::VhtCapabilities, ns3::VhtOperation, TestWifiSubElement, and TestWifiInformationElement.

Referenced by GetSerializedSize(), and Serialize().

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◆ GetSerializedSize()

uint16_t ns3::WifiInformationElement::GetSerializedSize ( ) const

Get the size of the serialized IE including Element ID and length fields (for every element this IE is possibly fragmented into).

Returns: the size of the serialized IE in bytes

Definition at line 35 of file wifi-information-element.cc.

References GetInformationFieldSize().

Referenced by WifiEhtCapabilitiesIeTest::DoRun(), ns3::dot11s::PeerLinkOpenStart::GetSerializedSize(), ns3::dot11s::PeerLinkConfirmStart::GetSerializedSize(), ns3::MgtAddBaRequestHeader::GetSerializedSize(), ns3::MgtAddBaResponseHeader::GetSerializedSize(), operator==(), WifiEhtCapabilitiesIeTest::SerializeIntoBuffer(), and WifiIeFragmentationTest::SerializeIntoBuffer().

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◆ operator==()

bool ns3::WifiInformationElement::operator== ( const WifiInformationElement & a ) const

virtual

Compare two IEs for equality by ID & Length, and then through memcmp of serialised version.

Parameters

a	another information element to compare with

Returns: true if the two IEs are equal, false otherwise

Reimplemented in ns3::dot11s::IeBeaconTiming.

Definition at line 234 of file wifi-information-element.cc.

References ns3::Buffer::AddAtEnd(), ns3::Buffer::Begin(), ElementId(), ElementIdExt(), GetSerializedSize(), ns3::Buffer::PeekData(), and Serialize().

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◆ Print()

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

virtual

Generate human-readable form of IE.

Parameters

os	output stream

Reimplemented in ns3::dot11s::IeBeaconTiming, ns3::dot11s::IeConfiguration, ns3::dot11s::IeMeshId, ns3::dot11s::IeLinkMetricReport, ns3::dot11s::IePeerManagement, ns3::dot11s::IePeeringProtocol, ns3::dot11s::IePerr, ns3::dot11s::IePrep, ns3::dot11s::IePreq, ns3::dot11s::IeRann, ns3::AddbaExtension, ns3::EhtCapabilities, ns3::EhtOperation, ns3::ExtendedCapabilities, ns3::HeCapabilities, ns3::HeOperation, ns3::HtCapabilities, ns3::HtOperation, ns3::NonInheritance, ns3::Ssid, ns3::SupportedRates, ns3::VhtCapabilities, and ns3::VhtOperation.

Definition at line 30 of file wifi-information-element.cc.

Referenced by ns3::operator<<().

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◆ Serialize()

Buffer::Iterator ns3::WifiInformationElement::Serialize ( Buffer::Iterator i ) const

Serialize entire IE including Element ID and length fields.

Handle fragmentation of the IE if needed.

Parameters

i	an iterator which points to where the IE should be written.

Returns: an iterator

Definition at line 61 of file wifi-information-element.cc.

References ElementId(), ElementIdExt(), GetInformationFieldSize(), IE_EXTENSION, ns3::Buffer::Iterator::Next(), SerializeFragments(), SerializeInformationField(), and ns3::Buffer::Iterator::WriteU8().

Referenced by operator==(), ns3::dot11s::PeerLinkOpenStart::Serialize(), ns3::dot11s::PeerLinkCloseStart::Serialize(), ns3::dot11s::PeerLinkConfirmStart::Serialize(), ns3::MgtAddBaRequestHeader::Serialize(), ns3::MgtAddBaResponseHeader::Serialize(), WifiEhtCapabilitiesIeTest::SerializeIntoBuffer(), and WifiIeFragmentationTest::SerializeIntoBuffer().

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◆ SerializeFragments()

Buffer::Iterator ns3::WifiInformationElement::SerializeFragments	(	Buffer::Iterator	i,
		uint16_t	size
	)		const

private

Serialize an IE that needs to be fragmented.

Parameters

i	an iterator which points to where the IE should be written.
size	the size of the body of the IE

Returns: an iterator pointing to past the IE that was serialized

Definition at line 87 of file wifi-information-element.cc.

References ns3::Buffer::AddAtStart(), ns3::Buffer::Begin(), ElementId(), ElementIdExt(), IE_EXTENSION, IE_FRAGMENT, NS_ASSERT, ns3::Buffer::Iterator::ReadU8(), SerializeInformationField(), and ns3::Buffer::Iterator::WriteU8().

Referenced by Serialize().

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◆ SerializeInformationField()

virtual void ns3::WifiInformationElement::SerializeInformationField ( Buffer::Iterator start ) const

privatepure virtual

Serialize information (i.e., the body of the IE, not including the Element ID and length octets)

Parameters

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

Implemented in ns3::dot11s::IeBeaconTiming, ns3::dot11s::IeConfiguration, ns3::dot11s::IeMeshId, ns3::dot11s::IeLinkMetricReport, ns3::dot11s::IePeerManagement, ns3::dot11s::IePeeringProtocol, ns3::dot11s::IePerr, ns3::dot11s::IePrep, ns3::dot11s::IePreq, ns3::dot11s::IeRann, ns3::AddbaExtension, ns3::EdcaParameterSet, ns3::EhtCapabilities, ns3::EhtOperation, ns3::MultiLinkElement, ns3::MultiLinkElement::PerStaProfileSubelement, ns3::TidToLinkMapping, ns3::ExtendedCapabilities, ns3::HeCapabilities, ns3::HeOperation, ns3::MuEdcaParameterSet, ns3::HtCapabilities, ns3::HtOperation, ns3::DsssParameterSet, ns3::ErpInformation, ns3::NonInheritance, ns3::ReducedNeighborReport, ns3::Ssid, ns3::SupportedRates, ns3::VhtCapabilities, ns3::VhtOperation, TestWifiSubElement, and TestWifiInformationElement.

Referenced by Serialize(), and SerializeFragments().

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

src/wifi/model/wifi-information-element.h
src/wifi/model/wifi-information-element.cc

Public Member Functions

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ ~WifiInformationElement()

Member Function Documentation

◆ Deserialize()

◆ DeserializeIfPresent()

◆ DeserializeInformationField()

◆ DoDeserialize()

◆ ElementId()

◆ ElementIdExt()

◆ GetInformationFieldSize()

◆ GetSerializedSize()

◆ operator==()

◆ Print()

◆ Serialize()

◆ SerializeFragments()

◆ SerializeInformationField()