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

Packet header for UDP packets. More...

#include "udp-header.h"

+ Inheritance diagram for ns3::UdpHeader:
+ Collaboration diagram for ns3::UdpHeader:

Public Member Functions

uint32_t Deserialize (Buffer::Iterator start) override
 
void EnableChecksums ()
 Enable checksum calculation for UDP. More...
 
void ForceChecksum (uint16_t checksum)
 Force the UDP checksum to a given value. More...
 
void ForcePayloadSize (uint16_t payloadSize)
 Force the UDP payload length to a given value. More...
 
uint16_t GetChecksum () const
 Return the checksum (only known after a Deserialize) More...
 
uint16_t GetDestinationPort () const
 
TypeId GetInstanceTypeId () const override
 Get the most derived TypeId for this Object. More...
 
uint32_t GetSerializedSize () const override
 
uint16_t GetSourcePort () const
 
void InitializeChecksum (Address source, Address destination, uint8_t protocol)
 
void InitializeChecksum (Ipv4Address source, Ipv4Address destination, uint8_t protocol)
 
void InitializeChecksum (Ipv6Address source, Ipv6Address destination, uint8_t protocol)
 
bool IsChecksumOk () const
 Is the UDP checksum correct ? More...
 
void Print (std::ostream &os) const override
 
void Serialize (Buffer::Iterator start) const override
 
void SetDestinationPort (uint16_t port)
 
void SetSourcePort (uint16_t port)
 
- 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 type ID. 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 Member Functions

uint16_t CalculateHeaderChecksum (uint16_t size) const
 Calculate the header checksum. More...
 

Private Attributes

bool m_calcChecksum {false}
 Flag to calculate checksum. More...
 
uint16_t m_checksum {0}
 Forced Checksum value. More...
 
Address m_destination
 Destination IP address. More...
 
uint16_t m_destinationPort {0xfffd}
 Destination port. More...
 
uint16_t m_forcedPayloadSize {0}
 Payload size (forced) More...
 
bool m_goodChecksum {true}
 Flag to indicate that checksum is correct. More...
 
uint16_t m_payloadSize {0}
 Payload size. More...
 
uint8_t m_protocol {17}
 Protocol number. More...
 
Address m_source
 Source IP address. More...
 
uint16_t m_sourcePort {0xfffd}
 Source port. 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 UDP packets.

This class has fields corresponding to those in a network UDP header (port numbers, payload size, checksum) as well as methods for serialization to and deserialization from a byte buffer.

Definition at line 40 of file udp-header.h.

Member Function Documentation

◆ CalculateHeaderChecksum()

uint16_t ns3::UdpHeader::CalculateHeaderChecksum ( uint16_t  size) const
private

Calculate the header checksum.

Parameters
sizepacket size
Returns
the checksum

Definition at line 84 of file udp-header.cc.

References ns3::Buffer::AddAtStart(), ns3::Buffer::Begin(), ns3::Buffer::Iterator::CalculateIpChecksum(), ns3::Ipv4Address::IsMatchingType(), ns3::Ipv6Address::IsMatchingType(), m_destination, m_protocol, m_source, ns3::Address::MAX_SIZE, ns3::WriteTo(), ns3::Buffer::Iterator::WriteU16(), and ns3::Buffer::Iterator::WriteU8().

Referenced by Deserialize(), and Serialize().

+ Here is the call graph for this function:
+ Here is the caller graph for this function:

◆ Deserialize()

uint32_t ns3::UdpHeader::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 202 of file udp-header.cc.

References CalculateHeaderChecksum(), ns3::Buffer::Iterator::CalculateIpChecksum(), GetSerializedSize(), m_calcChecksum, m_checksum, m_destinationPort, m_goodChecksum, m_payloadSize, m_sourcePort, ns3::Buffer::Iterator::ReadNtohU16(), ns3::Buffer::Iterator::ReadU16(), and two-ray-to-three-gpp-ch-calibration::start.

+ Here is the call graph for this function:

◆ EnableChecksums()

void ns3::UdpHeader::EnableChecksums ( )

Enable checksum calculation for UDP.

Definition at line 30 of file udp-header.cc.

References m_calcChecksum.

Referenced by ns3::SixLowPanNetDevice::DecompressLowPanUdpNhc(), ns3::UdpL4Protocol::Receive(), and ns3::UdpL4Protocol::Send().

+ Here is the caller graph for this function:

◆ ForceChecksum()

void ns3::UdpHeader::ForceChecksum ( uint16_t  checksum)

Force the UDP checksum to a given value.

This might be useful for test purposes or to restore the UDP checksum when the UDP header has been compressed (e.g., in 6LoWPAN). Note that, normally, the header checksum is calculated on the fly when the packet is serialized.

When this option is used, the UDP checksum is written in the header, regardless of the global ChecksumEnabled option.

Note
The checksum value must be a big endian number.
Parameters
checksumthe checksum to use (big endian).

Definition at line 124 of file udp-header.cc.

References m_checksum.

Referenced by ns3::SixLowPanNetDevice::DecompressLowPanUdpNhc().

+ Here is the caller graph for this function:

◆ ForcePayloadSize()

void ns3::UdpHeader::ForcePayloadSize ( uint16_t  payloadSize)

Force the UDP payload length to a given value.

This might be useful when forging a packet for test purposes.

Parameters
payloadSizethe payload length to use.

Definition at line 130 of file udp-header.cc.

References m_forcedPayloadSize.

◆ GetChecksum()

uint16_t ns3::UdpHeader::GetChecksum ( ) const

Return the checksum (only known after a Deserialize)

Returns
The checksum for this UdpHeader

Definition at line 223 of file udp-header.cc.

References m_checksum.

Referenced by ns3::SixLowPanNetDevice::CompressLowPanUdpNhc().

+ Here is the caller graph for this function:

◆ GetDestinationPort()

◆ GetInstanceTypeId()

TypeId ns3::UdpHeader::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 146 of file udp-header.cc.

References GetTypeId().

+ Here is the call graph for this function:

◆ GetSerializedSize()

uint32_t ns3::UdpHeader::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 159 of file udp-header.cc.

Referenced by Deserialize(), ns3::Rip::DoSendRouteUpdate(), ns3::RipNg::DoSendRouteUpdate(), ns3::Rip::HandleRequests(), ns3::RipNg::HandleRequests(), and Print().

+ Here is the caller graph for this function:

◆ GetSourcePort()

◆ GetTypeId()

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

Get the type ID.

Returns
the object TypeId

Definition at line 136 of file udp-header.cc.

References ns3::TypeId::SetParent().

Referenced by GetInstanceTypeId().

+ Here is the call graph for this function:
+ Here is the caller graph for this function:

◆ InitializeChecksum() [1/3]

void ns3::UdpHeader::InitializeChecksum ( Address  source,
Address  destination,
uint8_t  protocol 
)
Parameters
sourcethe ip source to use in the underlying ip packet.
destinationthe ip destination to use in the underlying ip packet.
protocolthe protocol number to use in the underlying ip packet.

If you want to use udp checksums, you should call this method prior to adding the header to a packet.

Definition at line 60 of file udp-header.cc.

References m_destination, m_protocol, and m_source.

Referenced by ns3::SixLowPanNetDevice::DecompressLowPanUdpNhc(), ns3::UdpL4Protocol::Receive(), and ns3::UdpL4Protocol::Send().

+ Here is the caller graph for this function:

◆ InitializeChecksum() [2/3]

void ns3::UdpHeader::InitializeChecksum ( Ipv4Address  source,
Ipv4Address  destination,
uint8_t  protocol 
)
Parameters
sourcethe ip source to use in the underlying ip packet.
destinationthe ip destination to use in the underlying ip packet.
protocolthe protocol number to use in the underlying ip packet.

If you want to use udp checksums, you should call this method prior to adding the header to a packet.

Definition at line 68 of file udp-header.cc.

References m_destination, m_protocol, and m_source.

◆ InitializeChecksum() [3/3]

void ns3::UdpHeader::InitializeChecksum ( Ipv6Address  source,
Ipv6Address  destination,
uint8_t  protocol 
)
Parameters
sourcethe ip source to use in the underlying ip packet.
destinationthe ip destination to use in the underlying ip packet.
protocolthe protocol number to use in the underlying ip packet.

If you want to use udp checksums, you should call this method prior to adding the header to a packet.

Definition at line 76 of file udp-header.cc.

References m_destination, m_protocol, and m_source.

◆ IsChecksumOk()

bool ns3::UdpHeader::IsChecksumOk ( ) const

Is the UDP checksum correct ?

Returns
true if the checksum is correct, false otherwise.

Definition at line 118 of file udp-header.cc.

References m_goodChecksum.

Referenced by ns3::SixLowPanNetDevice::CompressLowPanUdpNhc(), ns3::SixLowPanNetDevice::DecompressLowPanUdpNhc(), and ns3::UdpL4Protocol::Receive().

+ Here is the caller graph for this function:

◆ Print()

void ns3::UdpHeader::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 152 of file udp-header.cc.

References GetSerializedSize(), m_destinationPort, m_payloadSize, and m_sourcePort.

+ Here is the call graph for this function:

◆ Serialize()

void ns3::UdpHeader::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 165 of file udp-header.cc.

References CalculateHeaderChecksum(), ns3::Buffer::Iterator::CalculateIpChecksum(), m_calcChecksum, m_checksum, m_destinationPort, m_forcedPayloadSize, m_sourcePort, ns3::Buffer::Iterator::Next(), two-ray-to-three-gpp-ch-calibration::start, ns3::Buffer::Iterator::WriteHtonU16(), and ns3::Buffer::Iterator::WriteU16().

+ Here is the call graph for this function:

◆ SetDestinationPort()

void ns3::UdpHeader::SetDestinationPort ( uint16_t  port)

◆ SetSourcePort()

void ns3::UdpHeader::SetSourcePort ( uint16_t  port)

Member Data Documentation

◆ m_calcChecksum

bool ns3::UdpHeader::m_calcChecksum {false}
private

Flag to calculate checksum.

Definition at line 175 of file udp-header.h.

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

◆ m_checksum

uint16_t ns3::UdpHeader::m_checksum {0}
private

Forced Checksum value.

Definition at line 174 of file udp-header.h.

Referenced by Deserialize(), ForceChecksum(), GetChecksum(), and Serialize().

◆ m_destination

Address ns3::UdpHeader::m_destination
private

Destination IP address.

Definition at line 172 of file udp-header.h.

Referenced by CalculateHeaderChecksum(), and InitializeChecksum().

◆ m_destinationPort

uint16_t ns3::UdpHeader::m_destinationPort {0xfffd}
private

Destination port.

Definition at line 167 of file udp-header.h.

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

◆ m_forcedPayloadSize

uint16_t ns3::UdpHeader::m_forcedPayloadSize {0}
private

Payload size (forced)

Definition at line 169 of file udp-header.h.

Referenced by ForcePayloadSize(), and Serialize().

◆ m_goodChecksum

bool ns3::UdpHeader::m_goodChecksum {true}
private

Flag to indicate that checksum is correct.

Definition at line 176 of file udp-header.h.

Referenced by Deserialize(), and IsChecksumOk().

◆ m_payloadSize

uint16_t ns3::UdpHeader::m_payloadSize {0}
private

Payload size.

Definition at line 168 of file udp-header.h.

Referenced by Deserialize(), and Print().

◆ m_protocol

uint8_t ns3::UdpHeader::m_protocol {17}
private

Protocol number.

Definition at line 173 of file udp-header.h.

Referenced by CalculateHeaderChecksum(), and InitializeChecksum().

◆ m_source

Address ns3::UdpHeader::m_source
private

Source IP address.

Definition at line 171 of file udp-header.h.

Referenced by CalculateHeaderChecksum(), and InitializeChecksum().

◆ m_sourcePort

uint16_t ns3::UdpHeader::m_sourcePort {0xfffd}
private

Source port.

Definition at line 166 of file udp-header.h.

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


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