A PacketSocket is a link between an application and a net device. More...

#include <packet-socket.h>

Inheritance diagram for ns3::PacketSocket:

Collaboration diagram for ns3::PacketSocket:

Public Member Functions
	PacketSocket ()

virtual	~PacketSocket ()

virtual int	Bind (void)
	Allocate a local IPv4 endpoint for this socket. More...

virtual int	Bind (const Address &address)
	Allocate a local endpoint for this socket. More...

virtual int	Bind6 (void)
	Allocate a local IPv6 endpoint for this socket. More...

virtual int	Close (void)
	Close a socket. More...

virtual int	Connect (const Address &address)
	Initiate a connection to a remote host. More...

virtual bool	GetAllowBroadcast () const
	Query whether broadcast datagram transmissions are allowed. More...

virtual enum SocketErrno	GetErrno (void) const
	Get last error number. More...

virtual Ptr< Node >	GetNode (void) const
	Return the node this socket is associated with. More...

virtual uint32_t	GetRxAvailable (void) const
	Return number of bytes which can be returned from one or multiple calls to Recv. More...

virtual enum SocketType	GetSocketType (void) const

virtual int	GetSockName (Address &address) const
	Get socket address. More...

virtual uint32_t	GetTxAvailable (void) const
	Returns the number of bytes which can be sent in a single call to Send. More...

virtual int	Listen (void)
	Listen for incoming connections. More...

virtual Ptr< Packet >	Recv (uint32_t maxSize, uint32_t flags)
	Read data from the socket. More...

virtual Ptr< Packet >	RecvFrom (uint32_t maxSize, uint32_t flags, Address &fromAddress)
	Read a single packet from the socket and retrieve the sender address. More...

virtual int	Send (Ptr< Packet > p, uint32_t flags)
	Send data (or dummy data) to the remote host. More...

virtual int	SendTo (Ptr< Packet > p, uint32_t flags, const Address &toAddress)
	Send data to a specified peer. More...

virtual bool	SetAllowBroadcast (bool allowBroadcast)
	Configure whether broadcast datagram transmissions are allowed. More...

void	SetNode (Ptr< Node > node)

virtual int	ShutdownRecv (void)

virtual int	ShutdownSend (void)

Public Member Functions inherited from ns3::Socket
	Socket (void)

virtual	~Socket (void)

virtual void	BindToNetDevice (Ptr< NetDevice > netdevice)
	Bind a socket to specific device. More...

Ptr< NetDevice >	GetBoundNetDevice ()
	Returns socket's bound netdevice, if any. More...

uint8_t	GetIpTos (void) const
	Query the value of IP Type of Service of this socket. More...

virtual uint8_t	GetIpTtl (void) const
	Query the value of IP Time to Live field of this socket. More...

virtual uint8_t	GetIpv6HopLimit (void) const
	Query the value of IP Hop Limit field of this socket. More...

uint8_t	GetIpv6Tclass (void) const
	Query the value of IPv6 Traffic Class field of this socket. More...

bool	IsIpRecvTos (void) const
	Ask if the socket is currently passing information about IP Type of Service up the stack. More...

bool	IsIpRecvTtl (void) const
	Ask if the socket is currently passing information about IP_TTL up the stack. More...

bool	IsIpv6RecvHopLimit (void) const
	Ask if the socket is currently passing information about IPv6 Hop Limit up the stack. More...

bool	IsIpv6RecvTclass (void) const
	Ask if the socket is currently passing information about IPv6 Traffic Class up the stack. More...

bool	IsRecvPktInfo () const
	Get status indicating whether enable/disable packet information to socket. More...

Ptr< Packet >	Recv (void)
	Read a single packet from the socket. More...

int	Recv (uint8_t *buf, uint32_t size, uint32_t flags)
	Recv data (or dummy data) from the remote host. More...

Ptr< Packet >	RecvFrom (Address &fromAddress)
	Read a single packet from the socket and retrieve the sender address. More...

int	RecvFrom (uint8_t *buf, uint32_t size, uint32_t flags, Address &fromAddress)
	Read a single packet from the socket and retrieve the sender address. More...

int	Send (Ptr< Packet > p)
	Send data (or dummy data) to the remote host. More...

int	Send (const uint8_t *buf, uint32_t size, uint32_t flags)
	Send data (or dummy data) to the remote host. More...

int	SendTo (const uint8_t *buf, uint32_t size, uint32_t flags, const Address &address)
	Send data to a specified peer. More...

void	SetAcceptCallback (Callback< bool, Ptr< Socket >, const Address & > connectionRequest, Callback< void, Ptr< Socket >, const Address & > newConnectionCreated)
	Accept connection requests from remote hosts. More...

void	SetCloseCallbacks (Callback< void, Ptr< Socket > > normalClose, Callback< void, Ptr< Socket > > errorClose)
	Detect socket recv() events such as graceful shutdown or error. More...

void	SetConnectCallback (Callback< void, Ptr< Socket > > connectionSucceeded, Callback< void, Ptr< Socket > > connectionFailed)
	Specify callbacks to allow the caller to determine if the connection succeeds of fails. More...

void	SetDataSentCallback (Callback< void, Ptr< Socket >, uint32_t > dataSent)
	Notify application when a packet has been sent from transport protocol (non-standard socket call) More...

void	SetIpRecvTos (bool ipv4RecvTos)
	Tells a socket to pass information about IP Type of Service up the stack. More...

void	SetIpRecvTtl (bool ipv4RecvTtl)
	Tells a socket to pass information about IP_TTL up the stack. More...

void	SetIpTos (uint8_t ipTos)
	Manually set IP Type of Service field. More...

virtual void	SetIpTtl (uint8_t ipTtl)
	Manually set IP Time to Live field. More...

virtual void	SetIpv6HopLimit (uint8_t ipHopLimit)
	Manually set IPv6 Hop Limit. More...

void	SetIpv6RecvHopLimit (bool ipv6RecvHopLimit)
	Tells a socket to pass information about IPv6 Hop Limit up the stack. More...

void	SetIpv6RecvTclass (bool ipv6RecvTclass)
	Tells a socket to pass information about IPv6 Traffic Class up the stack. More...

void	SetIpv6Tclass (int ipTclass)
	Manually set IPv6 Traffic Class field. More...

void	SetRecvCallback (Callback< void, Ptr< Socket > >)
	Notify application when new data is available to be read. More...

void	SetRecvPktInfo (bool flag)
	Enable/Disable receive packet information to socket. More...

void	SetSendCallback (Callback< void, Ptr< Socket >, uint32_t > sendCb)
	Notify application when space in transmit buffer is added. More...

Public Member Functions inherited from ns3::Object
	Object ()

virtual	~Object ()

void	AggregateObject (Ptr< Object > other)

void	Dispose (void)
	Run the DoDispose methods of this object and all the objects aggregated to it. More...

AggregateIterator	GetAggregateIterator (void) const

virtual TypeId	GetInstanceTypeId (void) const

template<typename T >
Ptr< T >	GetObject (void) const

template<typename T >
Ptr< T >	GetObject (TypeId tid) const

void	Initialize (void)
	This method calls the virtual DoInitialize method on all the objects aggregated to this object. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

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

void	GetAttribute (std::string name, AttributeValue &value) const

bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const

void	SetAttribute (std::string name, const AttributeValue &value)

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)

Static Public Member Functions inherited from ns3::Socket
static Ptr< Socket >	CreateSocket (Ptr< Node > node, TypeId tid)
	This method wraps the creation of sockets that is performed on a given node by a SocketFactory specified by TypeId. More...

static TypeId	GetTypeId (void)
	Get the type ID. More...

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
static void	Cleanup (void)
	Noop. More...

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

Private Types
enum	State { STATE_OPEN, STATE_BOUND, STATE_CONNECTED, STATE_CLOSED }

Private Member Functions
int	DoBind (const PacketSocketAddress &address)

virtual void	DoDispose (void)
	This method is called by Object::Dispose or by the object's destructor, whichever comes first. More...

void	ForwardUp (Ptr< NetDevice > device, Ptr< const Packet > packet, uint16_t protocol, const Address &from, const Address &to, NetDevice::PacketType packetType)

uint32_t	GetMinMtu (PacketSocketAddress ad) const

Private Attributes
std::queue< Ptr< Packet > >	m_deliveryQueue
	Default destination address. More...

Address	m_destAddr

uint32_t	m_device

TracedCallback< Ptr< const Packet > >	m_dropTrace

enum SocketErrno	m_errno

bool	m_isSingleDevice

Ptr< Node >	m_node

uint16_t	m_protocol

uint32_t	m_rcvBufSize

uint32_t	m_rxAvailable

bool	m_shutdownRecv

bool	m_shutdownSend

enum State	m_state

Additional Inherited Members
Public Types inherited from ns3::Socket
enum	SocketErrno { ERROR_NOTERROR, ERROR_ISCONN, ERROR_NOTCONN, ERROR_MSGSIZE, ERROR_AGAIN, ERROR_SHUTDOWN, ERROR_OPNOTSUPP, ERROR_AFNOSUPPORT, ERROR_INVAL, ERROR_BADF, ERROR_NOROUTETOHOST, ERROR_NODEV, ERROR_ADDRNOTAVAIL, ERROR_ADDRINUSE, SOCKET_ERRNO_LAST }
	Enumeration of the possible errors returned by a socket. More...

enum	SocketType { NS3_SOCK_STREAM, NS3_SOCK_SEQPACKET, NS3_SOCK_DGRAM, NS3_SOCK_RAW }
	Enumeration of the possible socket types. More...

Protected Member Functions inherited from ns3::Socket
bool	IsManualIpTos (void) const
	Checks if the socket has a specific IPv4 ToS set. More...

bool	IsManualIpTtl (void) const
	Checks if the socket has a specific IPv4 TTL set. More...

bool	IsManualIpv6HopLimit (void) const
	Checks if the socket has a specific IPv6 Hop Limit set. More...

bool	IsManualIpv6Tclass (void) const
	Checks if the socket has a specific IPv6 Tclass set. More...

void	NotifyConnectionFailed (void)
	Notify through the callback (if set) that the connection has not been established due to an error. More...

bool	NotifyConnectionRequest (const Address &from)
	Notify through the callback (if set) that an incoming connection is being requested by a remote host. More...

void	NotifyConnectionSucceeded (void)
	Notify through the callback (if set) that the connection has been established. More...

void	NotifyDataRecv (void)
	Notify through the callback (if set) that some data have been received. More...

void	NotifyDataSent (uint32_t size)
	Notify through the callback (if set) that some data have been sent. More...

void	NotifyErrorClose (void)
	Notify through the callback (if set) that the connection has been closed due to an error. More...

void	NotifyNewConnectionCreated (Ptr< Socket > socket, const Address &from)
	Notify through the callback (if set) that a new connection has been created. More...

void	NotifyNormalClose (void)
	Notify through the callback (if set) that the connection has been closed. More...

void	NotifySend (uint32_t spaceAvailable)
	Notify through the callback (if set) that some data have been sent. More...

Protected Member Functions inherited from ns3::Object
	Object (const Object &o)

virtual void	DoInitialize (void)
	This method is called only once by Object::Initialize. More...

virtual void	NotifyNewAggregate (void)
	This method is invoked whenever two sets of objects are aggregated together. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)

virtual void	NotifyConstructionCompleted (void)
	This method is invoked once all member attributes have been initialized. More...

Protected Attributes inherited from ns3::Socket
Ptr< NetDevice >	m_boundnetdevice
	the device this socket is bound to (might be null). More...

bool	m_recvPktInfo
	if the socket should add packet info tags to the packet forwarded to L4. More...

Detailed Description

A PacketSocket is a link between an application and a net device.

Doxygen introspection did not find any typical Config paths.

A PacketSocket can be used to connect an application to a net device. The application provides the buffers of data, the socket conserts them to a raw packet and the net device then adds the protocol specific headers and trailers. This socket type is very similar to the linux and BSD "packet" sockets.

Here is a summary of the semantics of this class:

Bind: Bind uses only the protocol and device fields of the PacketSocketAddress. If none are provided, Bind uses zero for both, which means that the socket is bound to all protocols on all devices on the node.
Connect: uses only the protocol, device and "physical address" field of the PacketSocketAddress. It is used to set the default destination address for outgoing packets.
Send: send the input packet to the underlying NetDevices with the default destination address. The socket must be bound and connected.
SendTo: uses the protocol, device, and "physical address" fields of the PacketSocketAddress. The device value is used to specialize the packet transmission to a single device, the protocol value specifies the protocol of this packet only and the "physical address" field is used to override the default destination address. The socket must be bound.
Recv: The address represents the address of the packer originator. The fields "physical address", device, and protocol are filled.
Accept: not allowed
Listen: returns -1 (OPNOTSUPP)

Attributes

RcvBufSize: PacketSocket maximum receive buffer size (bytes)
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 131072
- Flags: construct write read

TraceSources

Drop: Drop packet due to receive buffer overflow

Definition at line 78 of file packet-socket.h.

Member Enumeration Documentation

enum ns3::PacketSocket::State

private

Enumerator
STATE_OPEN
STATE_BOUND
STATE_CONNECTED
STATE_CLOSED

Definition at line 118 of file packet-socket.h.

Constructor & Destructor Documentation

ns3::PacketSocket::PacketSocket ( )

Definition at line 56 of file packet-socket.cc.

References ns3::Socket::ERROR_NOTERROR, m_device, m_errno, m_isSingleDevice, m_shutdownRecv, m_shutdownSend, m_state, NS_LOG_FUNCTION, and STATE_OPEN.

ns3::PacketSocket::~PacketSocket ( )

virtual

Definition at line 74 of file packet-socket.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

int ns3::PacketSocket::Bind ( void )

virtual

Allocate a local IPv4 endpoint for this socket.

Returns: 0 on success, -1 on failure.

Implements ns3::Socket.

Definition at line 108 of file packet-socket.cc.

References first::address, DoBind(), NS_LOG_FUNCTION, ns3::PacketSocketAddress::SetAllDevices(), and ns3::PacketSocketAddress::SetProtocol().

Referenced by Bind6().

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int ns3::PacketSocket::Bind ( const Address & address )

virtual

Allocate a local endpoint for this socket.

Parameters

address the address to try to allocate

Returns: 0 on success, -1 on failure.

Implements ns3::Socket.

Definition at line 125 of file packet-socket.cc.

References ns3::PacketSocketAddress::ConvertFrom(), DoBind(), ns3::Socket::ERROR_INVAL, ns3::PacketSocketAddress::IsMatchingType(), m_errno, and NS_LOG_FUNCTION.

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int ns3::PacketSocket::Bind6 ( void )

virtual

Allocate a local IPv6 endpoint for this socket.

Returns: 0 on success, -1 on failure.

Implements ns3::Socket.

Definition at line 118 of file packet-socket.cc.

References Bind(), and NS_LOG_FUNCTION.

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int ns3::PacketSocket::Close ( void )

virtual

Close a socket.

Returns: zero on success, -1 on failure.

After the Close call, the socket is no longer valid, and cannot safely be used for subsequent operations.

Implements ns3::Socket.

Definition at line 198 of file packet-socket.cc.

References ns3::Socket::ERROR_BADF, ForwardUp(), m_errno, m_node, m_shutdownRecv, m_shutdownSend, m_state, ns3::MakeCallback(), NS_LOG_FUNCTION, STATE_BOUND, STATE_CLOSED, STATE_CONNECTED, and ns3::Node::UnregisterProtocolHandler().

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int ns3::PacketSocket::Connect ( const Address & address )

virtual

Initiate a connection to a remote host.

Parameters

address Address of remote.

Returns: 0 on success, -1 on error (in which case errno is set).

Implements ns3::Socket.

Definition at line 217 of file packet-socket.cc.

References first::address, ns3::Socket::ERROR_AFNOSUPPORT, ns3::Socket::ERROR_BADF, ns3::Socket::ERROR_INVAL, ns3::Socket::ERROR_ISCONN, ns3::PacketSocketAddress::IsMatchingType(), m_destAddr, m_errno, m_state, ns3::Socket::NotifyConnectionFailed(), ns3::Socket::NotifyConnectionSucceeded(), NS_LOG_FUNCTION, STATE_CLOSED, STATE_CONNECTED, and STATE_OPEN.

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int ns3::PacketSocket::DoBind ( const PacketSocketAddress & address )

private

Definition at line 138 of file packet-socket.cc.

References ns3::Socket::ERROR_BADF, ns3::Socket::ERROR_INVAL, ForwardUp(), ns3::Node::GetDevice(), ns3::PacketSocketAddress::GetProtocol(), ns3::PacketSocketAddress::GetSingleDevice(), ns3::PacketSocketAddress::IsSingleDevice(), ns3::Socket::m_boundnetdevice, m_device, m_errno, m_isSingleDevice, m_node, m_protocol, m_state, ns3::MakeCallback(), NS_LOG_FUNCTION, ns3::Node::RegisterProtocolHandler(), STATE_BOUND, STATE_CLOSED, and STATE_CONNECTED.

Referenced by Bind().

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void ns3::PacketSocket::DoDispose ( void )

privatevirtual

This method is called by Object::Dispose or by the object's destructor, whichever comes first.

Subclasses are expected to implement their real destruction code in an overriden version of this method and chain up to their parent's implementation once they are done. i.e., for simplicity, the destructor of every subclass should be empty and its content should be moved to the associated DoDispose method.

It is safe to call GetObject from within this method.

Reimplemented from ns3::Socket.

Definition at line 80 of file packet-socket.cc.

References m_device, and NS_LOG_FUNCTION.

void ns3::PacketSocket::ForwardUp	(	Ptr< NetDevice >	device,
		Ptr< const Packet >	packet,
		uint16_t	protocol,
		const Address &	from,
		const Address &	to,
		NetDevice::PacketType	packetType
	)

private

Definition at line 377 of file packet-socket.cc.

References ns3::Packet::AddPacketTag(), first::address, ns3::Packet::Copy(), ns3::Packet::GetSize(), ns3::Packet::GetUid(), m_deliveryQueue, m_dropTrace, m_rcvBufSize, m_rxAvailable, m_shutdownRecv, ns3::Socket::NotifyDataRecv(), NS_LOG_FUNCTION, NS_LOG_LOGIC, NS_LOG_WARN, ns3::SocketAddressTag::SetAddress(), ns3::PacketSocketTag::SetDestAddress(), ns3::DeviceNameTag::SetDeviceName(), ns3::PacketSocketTag::SetPacketType(), ns3::PacketSocketAddress::SetPhysicalAddress(), ns3::PacketSocketAddress::SetProtocol(), and ns3::PacketSocketAddress::SetSingleDevice().

Referenced by Close(), and DoBind().

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bool ns3::PacketSocket::GetAllowBroadcast ( ) const

virtual

Query whether broadcast datagram transmissions are allowed.

This method corresponds to using getsockopt() SO_BROADCAST of real network or BSD sockets.

Returns: true if broadcast is allowed, false otherwise

Implements ns3::Socket.

Definition at line 502 of file packet-socket.cc.

References NS_LOG_FUNCTION.

enum Socket::SocketErrno ns3::PacketSocket::GetErrno ( void ) const

virtual

Get last error number.

Returns: the errno associated to the last call which failed in this socket. Each socket's errno is initialized to zero when the socket is created.

Implements ns3::Socket.

Definition at line 87 of file packet-socket.cc.

References m_errno, and NS_LOG_FUNCTION.

uint32_t ns3::PacketSocket::GetMinMtu ( PacketSocketAddress ad ) const

private

Definition at line 272 of file packet-socket.cc.

References ns3::Node::GetDevice(), ns3::Node::GetNDevices(), ns3::PacketSocketAddress::GetSingleDevice(), ns3::PacketSocketAddress::IsSingleDevice(), m_node, and NS_LOG_FUNCTION.

Referenced by GetTxAvailable(), and SendTo().

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Ptr< Node > ns3::PacketSocket::GetNode ( void ) const

virtual

Return the node this socket is associated with.

Returns: the node

Implements ns3::Socket.

Definition at line 101 of file packet-socket.cc.

References m_node, and NS_LOG_FUNCTION.

uint32_t ns3::PacketSocket::GetRxAvailable ( void ) const

virtual

Return number of bytes which can be returned from one or multiple calls to Recv.

Must be possible to call this method from the Recv callback.

Returns: the number of bytes which can be returned from one or multiple Recv calls.

Implements ns3::Socket.

Definition at line 422 of file packet-socket.cc.

References m_rxAvailable, and NS_LOG_FUNCTION.

enum Socket::SocketType ns3::PacketSocket::GetSocketType ( void ) const

virtual

Returns: the socket type, analogous to getsockopt (SO_TYPE)

Implements ns3::Socket.

Definition at line 94 of file packet-socket.cc.

References ns3::Socket::NS3_SOCK_RAW, and NS_LOG_FUNCTION.

int ns3::PacketSocket::GetSockName ( Address & address ) const

virtual

Get socket address.

Parameters

address the address name this socket is associated with.

Returns: 0 if success, -1 otherwise

Implements ns3::Socket.

Definition at line 468 of file packet-socket.cc.

References ns3::PacketSocketAddress::ConvertFrom(), ns3::Node::GetDevice(), ns3::PacketSocketAddress::GetSingleDevice(), m_device, m_isSingleDevice, m_node, m_protocol, NS_LOG_FUNCTION, ns3::PacketSocketAddress::SetAllDevices(), ns3::PacketSocketAddress::SetPhysicalAddress(), ns3::PacketSocketAddress::SetProtocol(), and ns3::PacketSocketAddress::SetSingleDevice().

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uint32_t ns3::PacketSocket::GetTxAvailable ( void ) const

virtual

Returns the number of bytes which can be sent in a single call to Send.

For datagram sockets, this returns the number of bytes that can be passed atomically through the underlying protocol.

For stream sockets, this returns the available space in bytes left in the transmit buffer.

Returns: The number of bytes which can be sent in a single Send call.

Implements ns3::Socket.

Definition at line 293 of file packet-socket.cc.

References ns3::PacketSocketAddress::ConvertFrom(), GetMinMtu(), m_destAddr, m_state, NS_LOG_FUNCTION, and STATE_CONNECTED.

Referenced by SendTo().

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TypeId ns3::PacketSocket::GetTypeId ( void )

static

Definition at line 40 of file packet-socket.cc.

References m_dropTrace, m_rcvBufSize, ns3::MakeTraceSourceAccessor(), and ns3::TypeId::SetParent().

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int ns3::PacketSocket::Listen ( void )

virtual

Listen for incoming connections.

Returns: 0 on success, -1 on error (in which case errno is set).

Implements ns3::Socket.

Definition at line 251 of file packet-socket.cc.

References ns3::Socket::ERROR_OPNOTSUPP, m_errno, and NS_LOG_FUNCTION.

Ptr< Packet > ns3::PacketSocket::Recv	(	uint32_t	maxSize,
		uint32_t	flags
	)

virtual

Read data from the socket.

This function matches closely in semantics to the recv() function call in the standard C library (libc): ssize_t recv (int s, void *buf, size_t len, int flags); except that the receive I/O is asynchronous. This is the primary Recv method at this low-level API and must be implemented by subclasses.

This method is normally used only on a connected socket. In a typical blocking sockets model, this call would block until at least one byte is returned or the connection closes. In ns-3 at this API, the call returns immediately in such a case and returns 0 if nothing is available to be read. However, an application can set a callback, ns3::SetRecvCallback, to be notified of data being available to be read (when it conceptually unblocks); this is an asynchronous I/O model for recv().

This variant of Recv() uses class ns3::Packet to encapsulate data, rather than providing a raw pointer and length field. This allows an ns-3 application to attach tags if desired (such as a flow ID) and may allow the simulator to avoid some data copies. Despite the appearance of receiving Packets on a stream socket, just think of it as a fancy byte buffer with streaming semantics.

The semantics depend on the type of socket. For a datagram socket, each Recv() returns the data from at most one Send(), and order is not necessarily preserved. For a stream socket, the bytes are delivered in order, and on-the-wire packet boundaries are not preserved.

The flags argument is formed by or'ing one or more of the values: MSG_OOB process out-of-band data MSG_PEEK peek at incoming message None of these flags are supported for now.

Some variants of Recv() are supported as additional API, including RecvFrom(), overloaded Recv() without arguments, and variants that use raw character buffers.

Parameters

maxSize	reader will accept packet up to maxSize
flags	Socket control flags

Returns: Ptr<Packet> of the next in-sequence packet. Returns 0 if the socket cannot return a next in-sequence packet conforming to the maxSize and flags.

See also: SetRecvCallback

Implements ns3::Socket.

Definition at line 431 of file packet-socket.cc.

References ns3::Packet::GetSize(), m_deliveryQueue, m_rxAvailable, and NS_LOG_FUNCTION.

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Ptr< Packet > ns3::PacketSocket::RecvFrom	(	uint32_t	maxSize,
		uint32_t	flags,
		Address &	fromAddress
	)

virtual

Read a single packet from the socket and retrieve the sender address.

Calls Recv(maxSize, flags) with maxSize implicitly set to maximum sized integer, and flags set to zero.

This method has similar semantics to Recv () but subclasses may want to provide checks on socket state, so the implementation is pushed to subclasses.

Parameters

maxSize	reader will accept packet up to maxSize
flags	Socket control flags
fromAddress	output parameter that will return the address of the sender of the received packet, if any. Remains untouched if no packet is received.

Returns: Ptr<Packet> of the next in-sequence packet. Returns 0 if the socket cannot return a next in-sequence packet.

Implements ns3::Socket.

Definition at line 452 of file packet-socket.cc.

References ns3::SocketAddressTag::GetAddress(), NS_ASSERT, NS_LOG_FUNCTION, ns3::Packet::PeekPacketTag(), and ns3::Socket::Recv().

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int ns3::PacketSocket::Send	(	Ptr< Packet >	p,
		uint32_t	flags
	)

virtual

Send data (or dummy data) to the remote host.

This function matches closely in semantics to the send() function call in the standard C library (libc): ssize_t send (int s, const void *msg, size_t len, int flags); except that the send I/O is asynchronous. This is the primary Send method at this low-level API and must be implemented by subclasses.

In a typical blocking sockets model, this call would block upon lack of space to hold the message to be sent. In ns-3 at this API, the call returns immediately in such a case, but the callback registered with SetSendCallback() is invoked when the socket has space (when it conceptually unblocks); this is an asynchronous I/O model for send().

This variant of Send() uses class ns3::Packet to encapsulate data, rather than providing a raw pointer and length field. This allows an ns-3 application to attach tags if desired (such as a flow ID) and may allow the simulator to avoid some data copies. Despite the appearance of sending Packets on a stream socket, just think of it as a fancy byte buffer with streaming semantics.

If either the message buffer within the Packet is too long to pass atomically through the underlying protocol (for datagram sockets), or the message buffer cannot entirely fit in the transmit buffer (for stream sockets), -1 is returned and SocketErrno is set to ERROR_MSGSIZE. If the packet does not fit, the caller can split the Packet (based on information obtained from GetTxAvailable) and reattempt to send the data.

The flags argument is formed by or'ing one or more of the values: MSG_OOB process out-of-band data MSG_DONTROUTE bypass routing, use direct interface These flags are unsupported as of ns-3.1.

Parameters

p	ns3::Packet to send
flags	Socket control flags

Returns: the number of bytes accepted for transmission if no error occurs, and -1 otherwise.

See also: SetSendCallback

Implements ns3::Socket.

Definition at line 259 of file packet-socket.cc.

References ns3::Socket::ERROR_NOTCONN, m_destAddr, m_errno, m_state, NS_LOG_FUNCTION, SendTo(), STATE_BOUND, and STATE_OPEN.

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int ns3::PacketSocket::SendTo	(	Ptr< Packet >	p,
		uint32_t	flags,
		const Address &	toAddress
	)

virtual

Send data to a specified peer.

This method has similar semantics to Send () but subclasses may want to provide checks on socket state, so the implementation is pushed to subclasses.

Parameters

p	packet to send
flags	Socket control flags
toAddress	IP Address of remote host

Returns: -1 in case of error or the number of bytes copied in the internal buffer and accepted for transmission.

Implements ns3::Socket.

Definition at line 306 of file packet-socket.cc.

References ns3::PacketSocketAddress::ConvertFrom(), ns3::Socket::ERROR_AFNOSUPPORT, ns3::Socket::ERROR_BADF, ns3::Socket::ERROR_INVAL, ns3::Socket::ERROR_MSGSIZE, ns3::Socket::ERROR_SHUTDOWN, ns3::Node::GetDevice(), GetMinMtu(), ns3::Node::GetNDevices(), ns3::PacketSocketAddress::GetPhysicalAddress(), ns3::PacketSocketAddress::GetProtocol(), ns3::PacketSocketAddress::GetSingleDevice(), ns3::Packet::GetSize(), GetTxAvailable(), ns3::PacketSocketAddress::IsMatchingType(), ns3::PacketSocketAddress::IsSingleDevice(), m_errno, m_node, m_shutdownSend, m_state, ns3::Socket::NotifyDataSent(), ns3::Socket::NotifySend(), NS_LOG_FUNCTION, NS_LOG_LOGIC, and STATE_CLOSED.

Referenced by Send().

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bool ns3::PacketSocket::SetAllowBroadcast ( bool allowBroadcast )

virtual

Configure whether broadcast datagram transmissions are allowed.

This method corresponds to using setsockopt() SO_BROADCAST of real network or BSD sockets. If set on a socket, this option will enable or disable packets to be transmitted to broadcast destination addresses.

Parameters

allowBroadcast Whether broadcast is allowed