#include "ppp-header.h"

Inheritance diagram for ns3::PppHeader:

Collaboration diagram for ns3::PppHeader:

Public Member Functions
	PppHeader ()
	Construct a PPP header.

	~PppHeader () override
	Destroy a PPP header.

uint32_t	Deserialize (Buffer::Iterator start) override

TypeId	GetInstanceTypeId () const override
	Get the TypeId of the instance.

uint16_t	GetProtocol () const
	Get the protocol type carried by this PPP packet.

uint32_t	GetSerializedSize () const override

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

void	Serialize (Buffer::Iterator start) const override

void	SetProtocol (uint16_t protocol)
	Set the protocol type carried by this PPP packet.

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

virtual uint32_t	Deserialize (Buffer::Iterator start, Buffer::Iterator end)
	Deserialize the object from a buffer iterator.

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor.

void	GetAttribute (std::string name, AttributeValue &value, bool permissive=false) 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.

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 TypeId.

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

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

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

Private Attributes
uint16_t	m_protocol
	The PPP protocol type of the payload packet.

Additional Inherited Members
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.

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

Detailed Description

Packet header for PPP.

This class can be used to add a header to PPP packet. Currently we do not implement any of the state machine in RFC 1661 , we just encapsulate the inbound packet send it on. The goal here is not really to implement the point-to-point protocol, but to encapsulate our packets in a known protocol so packet sniffers can parse them.

if PPP is transmitted over a serial link, it will typically be framed in some way derivative of IBM SDLC (HDLC) with all that that entails. Thankfully, we don't have to deal with all of that – we can use our own protocol for getting bits across the serial link which we call an ns3 Packet. What we do have to worry about is being able to capture PPP frames which are understandable by Wireshark. All this means is that we need to teach the PcapWriter about the appropriate data link type (DLT_PPP = 9), and we need to add a PPP header to each packet. Since we are not using framed PPP, this just means prepending the sixteen bit PPP protocol number to the packet. The ns-3 way to do this is via a class that inherits from class Header.

Definition at line 37 of file ppp-header.h.

Constructor & Destructor Documentation

◆ PppHeader()

ns3::PppHeader::PppHeader ( )

Construct a PPP header.

Definition at line 23 of file ppp-header.cc.

◆ ~PppHeader()

ns3::PppHeader::~PppHeader ( )

override

Destroy a PPP header.

Definition at line 27 of file ppp-header.cc.

Member Function Documentation

◆ Deserialize()

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

overridevirtual

Parameters

start an iterator which points to where the header should read from.

Returns: the number of bytes read.

This method is used by Packet::RemoveHeader to re-create a header from the byte buffer of a packet. The data read is expected to match bit-for-bit the representation of this header in real networks.

Note that data is not actually removed from the buffer to which the iterator points. Both Packet::RemoveHeader() and Packet::PeekHeader() call Deserialize(), but only the RemoveHeader() has additional statements to remove the header bytes from the underlying buffer and associated metadata.

Implements ns3::Header.

Definition at line 79 of file ppp-header.cc.

References GetSerializedSize(), and m_protocol.

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◆ GetInstanceTypeId()

TypeId ns3::PppHeader::GetInstanceTypeId ( ) const

overridevirtual

Get the TypeId of the instance.

Returns: The TypeId for this instance

Implements ns3::ObjectBase.

Definition at line 42 of file ppp-header.cc.

References GetTypeId().

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◆ GetProtocol()

uint16_t ns3::PppHeader::GetProtocol ( ) const

Get the protocol type carried by this PPP packet.

The type numbers to be used are defined in RFC 3818

Returns: the protocol type being carried

Definition at line 92 of file ppp-header.cc.

References m_protocol.

Referenced by ns3::PointToPointNetDevice::ProcessHeader().

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◆ GetSerializedSize()

uint32_t ns3::PppHeader::GetSerializedSize ( ) const

overridevirtual

Returns: the expected size of the header.

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

Implements ns3::Header.

Definition at line 67 of file ppp-header.cc.

Referenced by Deserialize().

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◆ GetTypeId()

TypeId ns3::PppHeader::GetTypeId ( )

static

Get the TypeId.

Returns: The TypeId for this class

Definition at line 32 of file ppp-header.cc.

References ns3::TypeId::SetParent().

Referenced by GetInstanceTypeId().

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◆ Print()

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

overridevirtual

Parameters

os output stream This method is used by Packet::Print to print the content of a header as ascii data to a c++ output stream. Although the header 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::Header.

Definition at line 48 of file ppp-header.cc.

References m_protocol, and NS_ASSERT_MSG.

◆ Serialize()

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

overridevirtual

Parameters

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

This method is used by Packet::AddHeader 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 header in a real network.

Implements ns3::Header.

Definition at line 73 of file ppp-header.cc.

References m_protocol.

◆ SetProtocol()

void ns3::PppHeader::SetProtocol ( uint16_t protocol )

Set the protocol type carried by this PPP packet.

The type numbers to be used are defined in RFC 3818

Parameters

protocol the protocol type being carried

Definition at line 86 of file ppp-header.cc.

References m_protocol.

Referenced by ns3::PointToPointNetDevice::AddHeader().

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Member Data Documentation

◆ m_protocol

uint16_t ns3::PppHeader::m_protocol

private

The PPP protocol type of the payload packet.

Definition at line 91 of file ppp-header.h.

Referenced by Deserialize(), GetProtocol(), Print(), Serialize(), and SetProtocol().

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

src/point-to-point/model/ppp-header.h
src/point-to-point/model/ppp-header.cc

Public Member Functions

Static Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ PppHeader()

◆ ~PppHeader()

Member Function Documentation

◆ Deserialize()

◆ GetInstanceTypeId()

◆ GetProtocol()

◆ GetSerializedSize()

◆ GetTypeId()

◆ Print()

◆ Serialize()

◆ SetProtocol()

Member Data Documentation

◆ m_protocol