A Discrete-Event Network Simulator
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udp-header.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2005 INRIA
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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*/
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#ifndef UDP_HEADER_H
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#define UDP_HEADER_H
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#include "ns3/header.h"
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#include "ns3/ipv4-address.h"
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#include "ns3/ipv6-address.h"
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#include <stdint.h>
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#include <string>
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namespace
ns3
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{
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/**
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* \ingroup udp
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* \brief Packet header for UDP packets
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*
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* This class has fields corresponding to those in a network UDP header
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* (port numbers, payload size, checksum) as well as methods for serialization
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* to and deserialization from a byte buffer.
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*/
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class
UdpHeader
:
public
Header
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{
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public
:
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/**
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* \brief Enable checksum calculation for UDP
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*/
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void
EnableChecksums
();
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/**
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* \param port the destination port for this UdpHeader
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*/
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void
SetDestinationPort
(uint16_t
port
);
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/**
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* \param port The source port for this UdpHeader
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*/
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void
SetSourcePort
(uint16_t
port
);
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/**
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* \return The source port for this UdpHeader
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*/
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uint16_t
GetSourcePort
()
const
;
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/**
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* \return the destination port for this UdpHeader
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*/
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uint16_t
GetDestinationPort
()
const
;
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/**
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* \param source the ip source to use in the underlying
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* ip packet.
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* \param destination the ip destination to use in the
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* underlying ip packet.
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* \param protocol the protocol number to use in the underlying
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* ip packet.
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*
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* If you want to use udp checksums, you should call this
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* method prior to adding the header to a packet.
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*/
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void
InitializeChecksum
(
Address
source,
Address
destination, uint8_t protocol);
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/**
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* \param source the ip source to use in the underlying
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* ip packet.
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* \param destination the ip destination to use in the
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* underlying ip packet.
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* \param protocol the protocol number to use in the underlying
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* ip packet.
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*
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* If you want to use udp checksums, you should call this
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* method prior to adding the header to a packet.
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*/
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void
InitializeChecksum
(
Ipv4Address
source,
Ipv4Address
destination, uint8_t protocol);
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/**
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* \param source the ip source to use in the underlying
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* ip packet.
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* \param destination the ip destination to use in the
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* underlying ip packet.
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* \param protocol the protocol number to use in the underlying
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* ip packet.
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*
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* If you want to use udp checksums, you should call this
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* method prior to adding the header to a packet.
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*/
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void
InitializeChecksum
(
Ipv6Address
source,
Ipv6Address
destination, uint8_t protocol);
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/**
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* \brief Get the type ID.
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* \return the object TypeId
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*/
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static
TypeId
GetTypeId
();
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TypeId
GetInstanceTypeId
()
const override
;
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void
Print
(std::ostream& os)
const override
;
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uint32_t
GetSerializedSize
()
const override
;
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void
Serialize
(
Buffer::Iterator
start)
const override
;
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uint32_t
Deserialize
(
Buffer::Iterator
start)
override
;
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/**
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* \brief Is the UDP checksum correct ?
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* \returns true if the checksum is correct, false otherwise.
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*/
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bool
IsChecksumOk
()
const
;
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/**
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* \brief Force the UDP checksum to a given value.
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*
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* This might be useful for test purposes or to
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* restore the UDP checksum when the UDP header
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* has been compressed (e.g., in 6LoWPAN).
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* Note that, normally, the header checksum is
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* calculated on the fly when the packet is
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* serialized.
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*
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* When this option is used, the UDP checksum is written in
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* the header, regardless of the global ChecksumEnabled option.
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*
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* \note The checksum value must be a big endian number.
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*
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* \param checksum the checksum to use (big endian).
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*/
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void
ForceChecksum
(uint16_t checksum);
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/**
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* \brief Force the UDP payload length to a given value.
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*
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* This might be useful when forging a packet for test
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* purposes.
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*
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* \param payloadSize the payload length to use.
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*/
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void
ForcePayloadSize
(uint16_t payloadSize);
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/**
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* \brief Return the checksum (only known after a Deserialize)
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* \return The checksum for this UdpHeader
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*/
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uint16_t
GetChecksum
()
const
;
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private
:
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/**
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* \brief Calculate the header checksum
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* \param size packet size
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* \returns the checksum
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*/
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uint16_t
CalculateHeaderChecksum
(uint16_t size)
const
;
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// The magic values below are used only for debugging.
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// They can be used to easily detect memory corruption
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// problems so you can see the patterns in memory.
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uint16_t
m_sourcePort
{0xfffd};
//!< Source port
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uint16_t
m_destinationPort
{0xfffd};
//!< Destination port
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uint16_t
m_payloadSize
{0};
//!< Payload size
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uint16_t
m_forcedPayloadSize
{0};
//!< Payload size (forced)
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Address
m_source
;
//!< Source IP address
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Address
m_destination
;
//!< Destination IP address
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uint8_t
m_protocol
{17};
//!< Protocol number
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uint16_t
m_checksum
{0};
//!< Forced Checksum value
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bool
m_calcChecksum
{
false
};
//!< Flag to calculate checksum
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bool
m_goodChecksum
{
true
};
//!< Flag to indicate that checksum is correct
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};
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}
// namespace ns3
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#endif
/* UDP_HEADER */
ns3::Address
a polymophic address class
Definition
address.h:90
ns3::Buffer::Iterator
iterator in a Buffer instance
Definition
buffer.h:89
ns3::Header
Protocol header serialization and deserialization.
Definition
header.h:33
ns3::Ipv4Address
Ipv4 addresses are stored in host order in this class.
Definition
ipv4-address.h:31
ns3::Ipv6Address
Describes an IPv6 address.
Definition
ipv6-address.h:38
ns3::TypeId
a unique identifier for an interface.
Definition
type-id.h:48
ns3::UdpHeader
Packet header for UDP packets.
Definition
udp-header.h:30
ns3::UdpHeader::GetSerializedSize
uint32_t GetSerializedSize() const override
Definition
udp-header.cc:148
ns3::UdpHeader::Serialize
void Serialize(Buffer::Iterator start) const override
Definition
udp-header.cc:154
ns3::UdpHeader::m_destination
Address m_destination
Destination IP address.
Definition
udp-header.h:161
ns3::UdpHeader::CalculateHeaderChecksum
uint16_t CalculateHeaderChecksum(uint16_t size) const
Calculate the header checksum.
Definition
udp-header.cc:73
ns3::UdpHeader::EnableChecksums
void EnableChecksums()
Enable checksum calculation for UDP.
Definition
udp-header.cc:19
ns3::UdpHeader::m_protocol
uint8_t m_protocol
Protocol number.
Definition
udp-header.h:162
ns3::UdpHeader::m_destinationPort
uint16_t m_destinationPort
Destination port.
Definition
udp-header.h:156
ns3::UdpHeader::GetDestinationPort
uint16_t GetDestinationPort() const
Definition
udp-header.cc:43
ns3::UdpHeader::m_source
Address m_source
Source IP address.
Definition
udp-header.h:160
ns3::UdpHeader::m_payloadSize
uint16_t m_payloadSize
Payload size.
Definition
udp-header.h:157
ns3::UdpHeader::ForceChecksum
void ForceChecksum(uint16_t checksum)
Force the UDP checksum to a given value.
Definition
udp-header.cc:113
ns3::UdpHeader::m_sourcePort
uint16_t m_sourcePort
Source port.
Definition
udp-header.h:155
ns3::UdpHeader::GetSourcePort
uint16_t GetSourcePort() const
Definition
udp-header.cc:37
ns3::UdpHeader::GetInstanceTypeId
TypeId GetInstanceTypeId() const override
Get the most derived TypeId for this Object.
Definition
udp-header.cc:135
ns3::UdpHeader::m_calcChecksum
bool m_calcChecksum
Flag to calculate checksum.
Definition
udp-header.h:164
ns3::UdpHeader::Print
void Print(std::ostream &os) const override
Definition
udp-header.cc:141
ns3::UdpHeader::ForcePayloadSize
void ForcePayloadSize(uint16_t payloadSize)
Force the UDP payload length to a given value.
Definition
udp-header.cc:119
ns3::UdpHeader::IsChecksumOk
bool IsChecksumOk() const
Is the UDP checksum correct ?
Definition
udp-header.cc:107
ns3::UdpHeader::Deserialize
uint32_t Deserialize(Buffer::Iterator start) override
Definition
udp-header.cc:197
ns3::UdpHeader::m_forcedPayloadSize
uint16_t m_forcedPayloadSize
Payload size (forced)
Definition
udp-header.h:158
ns3::UdpHeader::GetChecksum
uint16_t GetChecksum() const
Return the checksum (only known after a Deserialize)
Definition
udp-header.cc:235
ns3::UdpHeader::m_checksum
uint16_t m_checksum
Forced Checksum value.
Definition
udp-header.h:163
ns3::UdpHeader::InitializeChecksum
void InitializeChecksum(Address source, Address destination, uint8_t protocol)
Definition
udp-header.cc:49
ns3::UdpHeader::GetTypeId
static TypeId GetTypeId()
Get the type ID.
Definition
udp-header.cc:125
ns3::UdpHeader::SetSourcePort
void SetSourcePort(uint16_t port)
Definition
udp-header.cc:31
ns3::UdpHeader::m_goodChecksum
bool m_goodChecksum
Flag to indicate that checksum is correct.
Definition
udp-header.h:165
ns3::UdpHeader::SetDestinationPort
void SetDestinationPort(uint16_t port)
Definition
udp-header.cc:25
uint32_t
port
uint16_t port
Definition
dsdv-manet.cc:33
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
src
internet
model
udp-header.h
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