A Discrete-Event Network Simulator
API
ns3::PppHeader Class Reference

Packet header for PPP. More...

#include "ppp-header.h"

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Public Member Functions

 PppHeader ()
 Construct a PPP header. More...
 
 ~PppHeader () override
 Destroy a PPP header. More...
 
uint32_t Deserialize (Buffer::Iterator start) override
 
TypeId GetInstanceTypeId () const override
 Get the TypeId of the instance. More...
 
uint16_t GetProtocol () const
 Get the protocol type carried by this PPP packet. More...
 
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. More...
 
- Public Member Functions inherited from ns3::Header
 ~Header () override
 
virtual uint32_t Deserialize (Buffer::Iterator start)=0
 Deserialize the object from a buffer iterator. More...
 
virtual uint32_t Deserialize (Buffer::Iterator start, Buffer::Iterator end)
 Deserialize the object from a buffer iterator. More...
 
- Public Member Functions inherited from ns3::Chunk
virtual uint32_t Deserialize (Buffer::Iterator start, Buffer::Iterator end)
 Deserialize the object from a buffer iterator. 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 TypeId GetTypeId ()
 Get the TypeId. More...
 
- Static Public Member Functions inherited from ns3::Header
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 Attributes

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

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 48 of file ppp-header.h.

Constructor & Destructor Documentation

◆ PppHeader()

ns3::PppHeader::PppHeader ( )

Construct a PPP header.

Definition at line 34 of file ppp-header.cc.

◆ ~PppHeader()

ns3::PppHeader::~PppHeader ( )
override

Destroy a PPP header.

Definition at line 38 of file ppp-header.cc.

Member Function Documentation

◆ Deserialize()

uint32_t ns3::PppHeader::Deserialize ( Buffer::Iterator  start)
overridevirtual
Parameters
startan 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 90 of file ppp-header.cc.

References GetSerializedSize(), m_protocol, and two-ray-to-three-gpp-ch-calibration::start.

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◆ GetInstanceTypeId()

TypeId ns3::PppHeader::GetInstanceTypeId ( void  ) const
overridevirtual

Get the TypeId of the instance.

Returns
The TypeId for this instance

Implements ns3::ObjectBase.

Definition at line 53 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 103 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 78 of file ppp-header.cc.

Referenced by Deserialize().

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◆ GetTypeId()

TypeId ns3::PppHeader::GetTypeId ( void  )
static

Get the TypeId.

Returns
The TypeId for this class

Definition at line 43 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
osoutput 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 59 of file ppp-header.cc.

References m_protocol, and NS_ASSERT_MSG.

◆ Serialize()

void ns3::PppHeader::Serialize ( Buffer::Iterator  start) const
overridevirtual
Parameters
startan 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 84 of file ppp-header.cc.

References m_protocol, and two-ray-to-three-gpp-ch-calibration::start.

◆ 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
protocolthe protocol type being carried

Definition at line 97 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 102 of file ppp-header.h.

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


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