Protocol header serialization and deserialization. More...

#include "sll-header.h"

Inheritance diagram for ns3::SllHeader:

Collaboration diagram for ns3::SllHeader:

Public Types
enum	PacketType { UNICAST_FROM_PEER_TO_ME = 0 , BROADCAST_BY_PEER = 1 , MULTICAST_BY_PEER = 2 , INTERCEPTED_PACKET = 3 , SENT_BY_US }
	Type of the packet. More...

Public Member Functions
	SllHeader ()

	~SllHeader () override

uint32_t	Deserialize (Buffer::Iterator start) override

uint16_t	GetArpType () const

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

PacketType	GetPacketType () const

uint32_t	GetSerializedSize () const override

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

void	Serialize (Buffer::Iterator start) const override

void	SetArpType (uint16_t arphdType)

void	SetPacketType (PacketType type)

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 type ID.

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.

Protected Attributes
uint64_t	m_address
	Address.

uint16_t	m_addressLength
	Address length.

uint16_t	m_arphdType
	ARP protocol hardware identifier.

PacketType	m_packetType
	Packet type.

uint16_t	m_protocolType
	protocol type

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

Protocol header serialization and deserialization.

Libpcap sometimes add an additional header to provide information that would be lost otherwise due to the link-layer/capture mechanism, for instance when capturing from "nlmon" device on linux

See also: http://www.tcpdump.org/linktypes/LINKTYPE_LINUX_SLL.html; https://wiki.wireshark.org/SLL

  +---------------------------+
  |         Packet type       |
  |         (2 Octets)        |
  +---------------------------+
  |        ARPHRD_ type       |
  |         (2 Octets)        |
  +---------------------------+
  | Link-layer address length |
  |         (2 Octets)        |
  +---------------------------+
  |    Link-layer address     |
  |         (8 Octets)        |
  +---------------------------+
  |        Protocol type      |
  |         (2 Octets)        |
  +---------------------------+
  |           Payload         |
  .                           .
  .                           .
  .                           .

Definition at line 54 of file sll-header.h.

Member Enumeration Documentation

◆ PacketType

enum ns3::SllHeader::PacketType

Type of the packet.

Enumerator
UNICAST_FROM_PEER_TO_ME	the packet was specifically sent to us by somebody else
BROADCAST_BY_PEER	packet was broadcast by somebody else
MULTICAST_BY_PEER	packet was multicast, but not broadcast, by somebody else
INTERCEPTED_PACKET	packet was sent to somebody else by somebody else
SENT_BY_US	the packet was sent by us

Definition at line 60 of file sll-header.h.

Constructor & Destructor Documentation

◆ SllHeader()

ns3::SllHeader::SllHeader ( )

Definition at line 19 of file sll-header.cc.

References NS_LOG_FUNCTION.

◆ ~SllHeader()

ns3::SllHeader::~SllHeader ( )

override

Definition at line 29 of file sll-header.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ Deserialize()

uint32_t ns3::SllHeader::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 100 of file sll-header.cc.

References GetSerializedSize(), m_address, m_addressLength, m_arphdType, m_packetType, m_protocolType, ns3::Buffer::Iterator::ReadNtohU16(), and ns3::Buffer::Iterator::ReadNtohU64().

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◆ GetArpType()

uint16_t ns3::SllHeader::GetArpType ( ) const

Returns: ARP header type field in network byte order The ARPHRD_ type field is in network byte order; it contains a Linux ARPHRD_ value for the link-layer device type.

Definition at line 51 of file sll-header.cc.

References m_arphdType.

◆ GetInstanceTypeId()

TypeId ns3::SllHeader::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 45 of file sll-header.cc.

References GetTypeId().

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◆ GetPacketType()

SllHeader::PacketType ns3::SllHeader::GetPacketType ( ) const

Returns: Packet type

Definition at line 64 of file sll-header.cc.

References m_packetType.

◆ GetSerializedSize()

uint32_t ns3::SllHeader::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 83 of file sll-header.cc.

Referenced by Deserialize().

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◆ GetTypeId()

TypeId ns3::SllHeader::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

Definition at line 35 of file sll-header.cc.

References ns3::TypeId::SetParent().

Referenced by GetInstanceTypeId().

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◆ Print()

void ns3::SllHeader::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 77 of file sll-header.cc.

References m_packetType, and m_protocolType.

◆ Serialize()

void ns3::SllHeader::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 89 of file sll-header.cc.

References m_address, m_addressLength, m_arphdType, m_packetType, m_protocolType, ns3::Buffer::Iterator::WriteHtonU16(), and ns3::Buffer::Iterator::WriteHtonU64().

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◆ SetArpType()

void ns3::SllHeader::SetArpType ( uint16_t arphdType )

Parameters

arphdType ARP protocol hardware identifier

Definition at line 57 of file sll-header.cc.

References m_arphdType, and NS_LOG_FUNCTION.

◆ SetPacketType()

void ns3::SllHeader::SetPacketType ( PacketType type )

Parameters

type	Depends on source and address of the packet

Definition at line 70 of file sll-header.cc.

References m_packetType, and NS_LOG_FUNCTION.

Member Data Documentation

◆ m_address

uint64_t ns3::SllHeader::m_address

protected

Address.

Definition at line 113 of file sll-header.h.

Referenced by Deserialize(), and Serialize().

◆ m_addressLength

uint16_t ns3::SllHeader::m_addressLength

protected

Address length.

Definition at line 112 of file sll-header.h.

Referenced by Deserialize(), and Serialize().

◆ m_arphdType

uint16_t ns3::SllHeader::m_arphdType

protected

ARP protocol hardware identifier.

Definition at line 111 of file sll-header.h.

Referenced by Deserialize(), GetArpType(), Serialize(), and SetArpType().

◆ m_packetType

PacketType ns3::SllHeader::m_packetType

protected

Packet type.

Definition at line 110 of file sll-header.h.

Referenced by Deserialize(), GetPacketType(), Print(), Serialize(), and SetPacketType().

◆ m_protocolType

uint16_t ns3::SllHeader::m_protocolType

protected

protocol type

Definition at line 114 of file sll-header.h.

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

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

src/network/utils/sll-header.h
src/network/utils/sll-header.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ PacketType

Constructor & Destructor Documentation

◆ SllHeader()

◆ ~SllHeader()

Member Function Documentation

◆ Deserialize()

◆ GetArpType()

◆ GetInstanceTypeId()

◆ GetPacketType()

◆ GetSerializedSize()

◆ GetTypeId()

◆ Print()

◆ Serialize()

◆ SetArpType()

◆ SetPacketType()

Member Data Documentation

◆ m_address

◆ m_addressLength

◆ m_arphdType

◆ m_packetType

◆ m_protocolType