Represent the Mac Trailer with the Frame Check Sequence field. More...

#include "lr-wpan-mac-trailer.h"

Inheritance diagram for ns3::LrWpanMacTrailer:

Collaboration diagram for ns3::LrWpanMacTrailer:

Public Member Functions
	LrWpanMacTrailer ()
	Default constructor for a MAC trailer with disabled FCS calculation. More...

bool	CheckFcs (Ptr< const Packet > p)
	Check the FCS of a given packet against the FCS value stored in the trailer. More...

uint32_t	Deserialize (Buffer::Iterator start) override

void	EnableFcs (bool enable)
	Enable or disable FCS calculation for this trailer. More...

uint16_t	GetFcs () const
	Get this trailers FCS value. More...

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

uint32_t	GetSerializedSize () const override

bool	IsFcsEnabled () const
	Query if FCS calculation is enabled for this trailer. More...

void	Print (std::ostream &os) const override

void	Serialize (Buffer::Iterator start) const override

void	SetFcs (Ptr< const Packet > p)
	Calculate and set the FCS value based on the given packet. More...

Public Member Functions inherited from ns3::Trailer
	~Trailer () override

uint32_t	Deserialize (Buffer::Iterator start, Buffer::Iterator end) override

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

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

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

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

Private Member Functions
uint16_t	GenerateCrc16 (uint8_t *data, int length)
	Calculate the 16-bit FCS value. More...

Private Attributes
bool	m_calcFcs
	Only if m_calcFcs is true, FCS values will be calculated and used in the trailer. More...

uint16_t	m_fcs
	The FCS value stored in this trailer. More...

Additional Inherited Members
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

Represent the Mac Trailer with the Frame Check Sequence field.

Definition at line 38 of file lr-wpan-mac-trailer.h.

Constructor & Destructor Documentation

◆ LrWpanMacTrailer()

ns3::LrWpanMacTrailer::LrWpanMacTrailer ( )

Default constructor for a MAC trailer with disabled FCS calculation.

Definition at line 34 of file lr-wpan-mac-trailer.cc.

Member Function Documentation

◆ CheckFcs()

bool ns3::LrWpanMacTrailer::CheckFcs ( Ptr< const Packet > p )

Check the FCS of a given packet against the FCS value stored in the trailer.

The packet itself should contain no trailer. If FCS calculation is disabled for this trailer, CheckFcs() will always return true.

Parameters

p	the packet to be checked

Returns: false, if the FCS values do not match, true otherwise

Definition at line 108 of file lr-wpan-mac-trailer.cc.

References ns3::Packet::CopyData(), GenerateCrc16(), GetFcs(), ns3::Packet::GetSize(), and m_calcFcs.

Referenced by ns3::LrWpanMac::PdDataIndication().

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◆ Deserialize()

uint32_t ns3::LrWpanMacTrailer::Deserialize ( Buffer::Iterator end )

overridevirtual

Parameters

end	an iterator which points to the end of the buffer where the trailer should be read from.

Returns: the number of bytes read.

This method is used by Packet::RemoveTrailer to re-create a trailer from the byte buffer of a packet. The data read is expected to match bit-for-bit the representation of this trailer in real networks. The input iterator points to the end of the area where the data shall be read from. This method is thus expected to call Buffer::Iterator::Prev prior to actually reading any data.

Implements ns3::Trailer.

Definition at line 76 of file lr-wpan-mac-trailer.cc.

References ns3::LR_WPAN_MAC_FCS_LENGTH, m_fcs, and two-ray-to-three-gpp-ch-calibration::start.

◆ EnableFcs()

void ns3::LrWpanMacTrailer::EnableFcs ( bool enable )

Enable or disable FCS calculation for this trailer.

Parameters

enable flag, indicating if FCS calculation should be enabled or not

Definition at line 129 of file lr-wpan-mac-trailer.cc.

References m_calcFcs, and m_fcs.

Referenced by ns3::LrWpanMac::McpsDataRequest(), ns3::LrWpanMac::MlmeAssociateResponse(), ns3::LrWpanMac::MlmeOrphanResponse(), ns3::LrWpanMac::PdDataIndication(), ns3::LrWpanMac::SendAck(), ns3::LrWpanMac::SendAssocRequestCommand(), ns3::LrWpanMac::SendBeaconRequestCommand(), ns3::LrWpanMac::SendDataRequestCommand(), ns3::LrWpanMac::SendOneBeacon(), and ns3::LrWpanMac::SendOrphanNotificationCommand().

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◆ GenerateCrc16()

uint16_t ns3::LrWpanMacTrailer::GenerateCrc16	(	uint8_t *	data,
		int	length
	)

private

Calculate the 16-bit FCS value.

CRC16-CCITT with a generator polynomial = ^16 + ^12 + ^5 + 1, LSB first and initial value = 0x0000.

Parameters

data	the checksum will be calculated over this data
length	the length of the data

Returns: the checksum

Definition at line 145 of file lr-wpan-mac-trailer.cc.

References data.

Referenced by CheckFcs(), and SetFcs().

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◆ GetFcs()

uint16_t ns3::LrWpanMacTrailer::GetFcs ( ) const

Get this trailers FCS value.

If FCS calculation is disabled for this trailer, the returned value is always 0.

Returns: the FCS value.

Definition at line 85 of file lr-wpan-mac-trailer.cc.

References m_fcs.

Referenced by CheckFcs().

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◆ GetInstanceTypeId()

TypeId ns3::LrWpanMacTrailer::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.

Implements ns3::ObjectBase.

Definition at line 51 of file lr-wpan-mac-trailer.cc.

References GetTypeId().

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◆ GetSerializedSize()

uint32_t ns3::LrWpanMacTrailer::GetSerializedSize ( ) const

overridevirtual

Returns: the expected size of the trailer.

This method is used by Packet::AddTrailer to store a trailer into the byte buffer of a packet. This method should return the number of bytes which are needed to store the full trailer data by Serialize.

Implements ns3::Trailer.

Definition at line 63 of file lr-wpan-mac-trailer.cc.

References ns3::LR_WPAN_MAC_FCS_LENGTH.

◆ GetTypeId()

TypeId ns3::LrWpanMacTrailer::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 41 of file lr-wpan-mac-trailer.cc.

References ns3::TypeId::SetParent().

Referenced by GetInstanceTypeId().

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◆ IsFcsEnabled()

bool ns3::LrWpanMacTrailer::IsFcsEnabled ( ) const

Query if FCS calculation is enabled for this trailer.

Returns: true, if FCS calculation is enabled, false otherwise.

Definition at line 139 of file lr-wpan-mac-trailer.cc.

References m_calcFcs.

◆ Print()

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

overridevirtual

Parameters

os output stream This method is used by Packet::Print to print the content of a trailer as ascii data to a c++ output stream. Although the trailer is free to format its output as it wishes, it is recommended to follow a few rules to integrate with the packet pretty printer: start with flags, small field values located between a pair of parens. Values should be separated by whitespace. Follow the parens with the important fields, separated by whitespace. i.e.: (field1 val1 field2 val2 field3 val3) field4 val4 field5 val5

Implements ns3::Trailer.

Definition at line 57 of file lr-wpan-mac-trailer.cc.

References m_fcs.

◆ Serialize()

void ns3::LrWpanMacTrailer::Serialize ( Buffer::Iterator start ) const

overridevirtual

Parameters

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

This method is used by Packet::AddTrailer to store a header into the byte buffer of a packet. The data written is expected to match bit-for-bit the representation of this trailer in real networks. The input iterator points to the end of the area where the data shall be written. This method is thus expected to call Buffer::Iterator::Prev prior to actually writing any data.

Implements ns3::Trailer.

Definition at line 69 of file lr-wpan-mac-trailer.cc.

References ns3::LR_WPAN_MAC_FCS_LENGTH, m_fcs, and two-ray-to-three-gpp-ch-calibration::start.