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ns3::VirtualNetDevice Class Reference

A virtual device, similar to Linux TUN/TAP interfaces. More...

#include <virtual-net-device.h>

+ Inheritance diagram for ns3::VirtualNetDevice:
+ Collaboration diagram for ns3::VirtualNetDevice:

Public Types

typedef Callback< bool, Ptr
< Packet >, const Address
&, const Address &, uint16_t > 
SendCallback
 Callback the be invoked when the VirtualNetDevice is asked to queue/transmit a packet. More...
 
- Public Types inherited from ns3::NetDevice
enum  PacketType {
  PACKET_HOST = 1, NS3_PACKET_HOST = PACKET_HOST, PACKET_BROADCAST, NS3_PACKET_BROADCAST = PACKET_BROADCAST,
  PACKET_MULTICAST, NS3_PACKET_MULTICAST = PACKET_MULTICAST, PACKET_OTHERHOST, NS3_PACKET_OTHERHOST = PACKET_OTHERHOST
}
 Packet types are used as they are in Linux. More...
 
typedef Callback< bool, Ptr
< NetDevice >, Ptr< const
Packet >, uint16_t, const
Address &, const Address
&, enum PacketType
PromiscReceiveCallback
 
typedef Callback< bool, Ptr
< NetDevice >, Ptr< const
Packet >, uint16_t, const
Address & > 
ReceiveCallback
 

Public Member Functions

 VirtualNetDevice ()
 
virtual ~VirtualNetDevice ()
 
virtual void AddLinkChangeCallback (Callback< void > callback)
 
virtual Address GetAddress (void) const
 
virtual Address GetBroadcast (void) const
 
virtual Ptr< ChannelGetChannel (void) const
 
virtual uint32_t GetIfIndex (void) const
 
virtual uint16_t GetMtu (void) const
 
virtual Address GetMulticast (Ipv4Address multicastGroup) const
 Make and return a MAC multicast address using the provided multicast group. More...
 
virtual Address GetMulticast (Ipv6Address addr) const
 Get the MAC multicast address corresponding to the IPv6 address provided. More...
 
virtual Ptr< NodeGetNode (void) const
 
virtual bool IsBridge (void) const
 Return true if the net device is acting as a bridge. More...
 
virtual bool IsBroadcast (void) const
 
virtual bool IsLinkUp (void) const
 
virtual bool IsMulticast (void) const
 
virtual bool IsPointToPoint (void) const
 Return true if the net device is on a point-to-point link. More...
 
virtual bool NeedsArp (void) const
 
bool Receive (Ptr< Packet > packet, uint16_t protocol, const Address &source, const Address &destination, PacketType packetType)
 
virtual bool Send (Ptr< Packet > packet, const Address &dest, uint16_t protocolNumber)
 
virtual bool SendFrom (Ptr< Packet > packet, const Address &source, const Address &dest, uint16_t protocolNumber)
 
virtual void SetAddress (Address address)
 Set the address of this interface. More...
 
virtual void SetIfIndex (const uint32_t index)
 
void SetIsPointToPoint (bool isPointToPoint)
 Configure whether the virtual device is point-to-point. More...
 
bool SetMtu (const uint16_t mtu)
 Configure the reported MTU for the virtual device. More...
 
void SetNeedsArp (bool needsArp)
 Configure whether the virtual device needs ARP. More...
 
virtual void SetNode (Ptr< Node > node)
 
virtual void SetPromiscReceiveCallback (NetDevice::PromiscReceiveCallback cb)
 
virtual void SetReceiveCallback (NetDevice::ReceiveCallback cb)
 
void SetSendCallback (SendCallback transmitCb)
 Set the user callback to be called when a L2 packet is to be transmitted. More...
 
void SetSupportsSendFrom (bool supportsSendFrom)
 Configure whether the virtual device supports SendFrom. More...
 
virtual bool SupportsSendFrom () const
 
- Public Member Functions inherited from ns3::NetDevice
virtual ~NetDevice ()
 
- 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...
 
SimpleRefCountoperator= (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::NetDevice
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...
 

Protected Member Functions

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

Private Attributes

uint32_t m_index
 
bool m_isPointToPoint
 
TracedCallback< Ptr< const
Packet > > 
m_macPromiscRxTrace
 
TracedCallback< Ptr< const
Packet > > 
m_macRxTrace
 
TracedCallback< Ptr< const
Packet > > 
m_macTxTrace
 
uint16_t m_mtu
 
Address m_myAddress
 
std::string m_name
 
bool m_needsArp
 
Ptr< Nodem_node
 
PromiscReceiveCallback m_promiscRxCallback
 
TracedCallback< Ptr< const
Packet > > 
m_promiscSnifferTrace
 
ReceiveCallback m_rxCallback
 
SendCallback m_sendCb
 
TracedCallback< Ptr< const
Packet > > 
m_snifferTrace
 
bool m_supportsSendFrom
 

Detailed Description

A virtual device, similar to Linux TUN/TAP interfaces.

Config Paths

ns3::VirtualNetDevice is accessible through the following paths with Config::Set and Config::Connect:

  • /NodeList/[i]/DeviceList/[i]/$ns3::VirtualNetDevice

Attributes

  • Mtu: The MAC-level Maximum Transmission Unit

TraceSources

  • MacTx: Trace source indicating a packet has arrived for transmission by this device
  • MacPromiscRx: A packet has been received by this device, has been passed up from the physical layer and is being forwarded up the local protocol stack. This is a promiscuous trace,
  • MacRx: A packet has been received by this device, has been passed up from the physical layer and is being forwarded up the local protocol stack. This is a non-promiscuous trace,
  • Sniffer: Trace source simulating a non-promiscuous packet sniffer attached to the device
  • PromiscSniffer: Trace source simulating a promiscuous packet sniffer attached to the device

A VirtualNetDevice is a "virtual" NetDevice implementation which delegates to a user callback (see method SetSendCallback()) the task of actually transmitting a packet. It also allows the user code to inject the packet as if it had been received by the VirtualNetDevice. Together, these features allow one to build tunnels. For instance, by transmitting packets into a UDP socket we end up building an IP-over-UDP-over-IP tunnel, or IP-over-IP tunnels.

The same thing could be accomplished by subclassing NetDevice directly. However, VirtualNetDevice is usually much simpler to program than a NetDevice subclass.

Definition at line 58 of file virtual-net-device.h.

Member Typedef Documentation

typedef Callback<bool, Ptr<Packet>, const Address&, const Address&, uint16_t> ns3::VirtualNetDevice::SendCallback

Callback the be invoked when the VirtualNetDevice is asked to queue/transmit a packet.

For more information, consult the documentation of NetDevice::SendFrom().

Definition at line 65 of file virtual-net-device.h.

Constructor & Destructor Documentation

ns3::VirtualNetDevice::VirtualNetDevice ( )

Definition at line 74 of file virtual-net-device.cc.

References m_isPointToPoint, m_needsArp, and m_supportsSendFrom.

ns3::VirtualNetDevice::~VirtualNetDevice ( )
virtual

Definition at line 114 of file virtual-net-device.cc.

References NS_LOG_FUNCTION_NOARGS.

Member Function Documentation

void ns3::VirtualNetDevice::AddLinkChangeCallback ( Callback< void >  callback)
virtual
Parameters
callbackthe callback to invoke

Add a callback invoked whenever the link status changes to UP. This callback is typically used by the IP/ARP layer to flush the ARP cache and by IPv6 stack to flush NDISC cache whenever the link goes up.

Implements ns3::NetDevice.

Definition at line 202 of file virtual-net-device.cc.

void ns3::VirtualNetDevice::DoDispose ( void  )
protectedvirtual

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::Object.

Definition at line 120 of file virtual-net-device.cc.

References ns3::Object::DoDispose(), m_node, and NS_LOG_FUNCTION_NOARGS.

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Address ns3::VirtualNetDevice::GetAddress ( void  ) const
virtual
Returns
the current Address of this interface.

Implements ns3::NetDevice.

Definition at line 178 of file virtual-net-device.cc.

References m_myAddress.

Referenced by Send(), and ns3::EpcSgwPgwApplication::SendToTunDevice().

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Address ns3::VirtualNetDevice::GetBroadcast ( void  ) const
virtual
Returns
the broadcast address supported by this netdevice.

Calling this method is invalid if IsBroadcast returns not true.

Implements ns3::NetDevice.

Definition at line 213 of file virtual-net-device.cc.

Ptr< Channel > ns3::VirtualNetDevice::GetChannel ( void  ) const
virtual
Returns
the channel this NetDevice is connected to. The value returned can be zero if the NetDevice is not yet connected to any channel or if the underlying NetDevice has no concept of a channel. i.e., callers must check for zero and be ready to handle it.

Implements ns3::NetDevice.

Definition at line 172 of file virtual-net-device.cc.

uint32_t ns3::VirtualNetDevice::GetIfIndex ( void  ) const
virtual
Returns
index ifIndex of the device

Implements ns3::NetDevice.

Definition at line 166 of file virtual-net-device.cc.

References m_index.

uint16_t ns3::VirtualNetDevice::GetMtu ( void  ) const
virtual
Returns
the link-level MTU in bytes for this interface.

This value is typically used by the IP layer to perform IP fragmentation when needed.

Implements ns3::NetDevice.

Definition at line 190 of file virtual-net-device.cc.

References m_mtu.

Referenced by GetTypeId().

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Address ns3::VirtualNetDevice::GetMulticast ( Ipv4Address  multicastGroup) const
virtual

Make and return a MAC multicast address using the provided multicast group.

RFC 1112 says that an Ipv4 host group address is mapped to an Ethernet multicast address by placing the low-order 23-bits of the IP address into the low-order 23 bits of the Ethernet multicast address 01-00-5E-00-00-00 (hex). Similar RFCs exist for Ipv6 and Eui64 mappings. This method performs the multicast address creation function appropriate to the underlying MAC address of the device. This MAC address is encapsulated in an abstract Address to avoid dependencies on the exact MAC address format.

In the case of net devices that do not support multicast, clients are expected to test NetDevice::IsMulticast and avoid attempting to map multicast packets. Subclasses of NetDevice that do support multicasting are expected to override this method and provide an implementation appropriate to the particular device.

Parameters
multicastGroupThe IP address for the multicast group destination of the packet.
Returns
The MAC multicast Address used to send packets to the provided multicast group.
Warning
Calling this method is invalid if IsMulticast returns not true.
See also
Ipv4Address
Address
NetDevice::IsMulticast

Implements ns3::NetDevice.

Definition at line 224 of file virtual-net-device.cc.

Address ns3::VirtualNetDevice::GetMulticast ( Ipv6Address  addr) const
virtual

Get the MAC multicast address corresponding to the IPv6 address provided.

Parameters
addrIPv6 address
Returns
the MAC multicast address
Warning
Calling this method is invalid if IsMulticast returns not true.

Implements ns3::NetDevice.

Definition at line 229 of file virtual-net-device.cc.

Ptr< Node > ns3::VirtualNetDevice::GetNode ( void  ) const
virtual
Returns
the node base class which contains this network interface.

When a subclass needs to get access to the underlying node base class to print the nodeid for example, it can invoke this method.

Implements ns3::NetDevice.

Definition at line 265 of file virtual-net-device.cc.

References m_node.

TypeId ns3::VirtualNetDevice::GetTypeId ( void  )
static
bool ns3::VirtualNetDevice::IsBridge ( void  ) const
virtual

Return true if the net device is acting as a bridge.

Returns
value of m_isBridge flag

Implements ns3::NetDevice.

Definition at line 300 of file virtual-net-device.cc.

bool ns3::VirtualNetDevice::IsBroadcast ( void  ) const
virtual
Returns
true if this interface supports a broadcast address, false otherwise.

Implements ns3::NetDevice.

Definition at line 207 of file virtual-net-device.cc.

bool ns3::VirtualNetDevice::IsLinkUp ( void  ) const
virtual
Returns
true if link is up; false otherwise

Implements ns3::NetDevice.

Definition at line 196 of file virtual-net-device.cc.

bool ns3::VirtualNetDevice::IsMulticast ( void  ) const
virtual
Returns
value of m_isMulticast flag

Implements ns3::NetDevice.

Definition at line 219 of file virtual-net-device.cc.

bool ns3::VirtualNetDevice::IsPointToPoint ( void  ) const
virtual

Return true if the net device is on a point-to-point link.

Returns
value of m_isPointToPoint flag

Implements ns3::NetDevice.

Definition at line 236 of file virtual-net-device.cc.

References m_isPointToPoint.

bool ns3::VirtualNetDevice::NeedsArp ( void  ) const
virtual
Returns
true if ARP is needed, false otherwise.

Called by higher-layers to check if this NetDevice requires ARP to be used.

Implements ns3::NetDevice.

Definition at line 277 of file virtual-net-device.cc.

References m_needsArp.

bool ns3::VirtualNetDevice::Receive ( Ptr< Packet packet,
uint16_t  protocol,
const Address source,
const Address destination,
PacketType  packetType 
)
Parameters
packetpacket sent from below up to Network Device
protocolProtocol type
sourcethe address of the sender of this packet.
destinationthe address of the receiver of this packet.
packetTypetype of packet received (broadcast/multicast/unicast/otherhost)
Returns
true if the packet was forwarded successfully, false otherwise.

Forward a "virtually received" packet up the node's protocol stack.

Definition at line 128 of file virtual-net-device.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_macPromiscRxTrace, m_macRxTrace, m_promiscRxCallback, m_promiscSnifferTrace, m_rxCallback, m_snifferTrace, and ns3::NetDevice::PACKET_OTHERHOST.

Referenced by ns3::EpcSgwPgwApplication::SendToTunDevice().

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bool ns3::VirtualNetDevice::Send ( Ptr< Packet packet,
const Address dest,
uint16_t  protocolNumber 
)
virtual
Parameters
packetpacket sent from above down to Network Device
destmac address of the destination (already resolved)
protocolNumberidentifies the type of payload contained in this packet. Used to call the right L3Protocol when the packet is received.

Called from higher layer to send packet into Network Device to the specified destination Address

Returns
whether the Send operation succeeded

Implements ns3::NetDevice.

Definition at line 242 of file virtual-net-device.cc.

References GetAddress(), m_macTxTrace, and m_sendCb.

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bool ns3::VirtualNetDevice::SendFrom ( Ptr< Packet packet,
const Address source,
const Address dest,
uint16_t  protocolNumber 
)
virtual
Parameters
packetpacket sent from above down to Network Device
sourcesource mac address (so called "MAC spoofing")
destmac address of the destination (already resolved)
protocolNumberidentifies the type of payload contained in this packet. Used to call the right L3Protocol when the packet is received.

Called from higher layer to send packet into Network Device with the specified source and destination Addresses.

Returns
whether the Send operation succeeded

Implements ns3::NetDevice.

Definition at line 253 of file virtual-net-device.cc.

References m_macTxTrace, m_sendCb, m_supportsSendFrom, and NS_ASSERT.

void ns3::VirtualNetDevice::SetAddress ( Address  address)
virtual

Set the address of this interface.

Parameters
addressaddress to set

Implements ns3::NetDevice.

Definition at line 184 of file virtual-net-device.cc.

References m_myAddress.

Referenced by ns3::PointToPointEpcHelper::PointToPointEpcHelper().

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void ns3::VirtualNetDevice::SetIfIndex ( const uint32_t  index)
virtual
Parameters
indexifIndex of the device

Implements ns3::NetDevice.

Definition at line 160 of file virtual-net-device.cc.

References m_index.

void ns3::VirtualNetDevice::SetIsPointToPoint ( bool  isPointToPoint)

Configure whether the virtual device is point-to-point.

Parameters
isPointToPointthe value that should be returned by the IsPointToPoint method for this instance.

Definition at line 101 of file virtual-net-device.cc.

References m_isPointToPoint.

bool ns3::VirtualNetDevice::SetMtu ( const uint16_t  mtu)
virtual

Configure the reported MTU for the virtual device.

Parameters
mtuMTU value to set
Returns
whether the MTU value was within legal bounds

Implements ns3::NetDevice.

Definition at line 107 of file virtual-net-device.cc.

References m_mtu.

Referenced by GetTypeId().

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void ns3::VirtualNetDevice::SetNeedsArp ( bool  needsArp)

Configure whether the virtual device needs ARP.

Parameters
needsArpthe the 'needs arp' value that will be returned by the NeedsArp() method. The method IsBroadcast() will also return this value.

Definition at line 89 of file virtual-net-device.cc.

References m_needsArp.

void ns3::VirtualNetDevice::SetNode ( Ptr< Node node)
virtual
Parameters
nodethe node associated to this netdevice.

This method is called from ns3::Node::AddDevice.

Implements ns3::NetDevice.

Definition at line 271 of file virtual-net-device.cc.

References m_node.

void ns3::VirtualNetDevice::SetPromiscReceiveCallback ( NetDevice::PromiscReceiveCallback  cb)
virtual
Parameters
cbcallback to invoke whenever a packet has been received in promiscuous mode and must be forwarded to the higher layers.

Enables netdevice promiscuous mode and sets the callback that will handle promiscuous mode packets. Note, promiscuous mode packets means all packets, including those packets that can be sensed by the netdevice but which are intended to be received by other hosts.

Implements ns3::NetDevice.

Definition at line 289 of file virtual-net-device.cc.

References m_promiscRxCallback.

void ns3::VirtualNetDevice::SetReceiveCallback ( NetDevice::ReceiveCallback  cb)
virtual
Parameters
cbcallback to invoke whenever a packet has been received and must be forwarded to the higher layers.

Implements ns3::NetDevice.

Definition at line 283 of file virtual-net-device.cc.

References m_rxCallback.

void ns3::VirtualNetDevice::SetSendCallback ( SendCallback  transmitCb)

Set the user callback to be called when a L2 packet is to be transmitted.

Parameters
transmitCbthe new transmit callback

Definition at line 83 of file virtual-net-device.cc.

References m_sendCb.

Referenced by ns3::PointToPointEpcHelper::DoDispose().

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void ns3::VirtualNetDevice::SetSupportsSendFrom ( bool  supportsSendFrom)

Configure whether the virtual device supports SendFrom.

Definition at line 95 of file virtual-net-device.cc.

References m_supportsSendFrom.

bool ns3::VirtualNetDevice::SupportsSendFrom ( ) const
virtual
Returns
true if this interface supports a bridging mode, false otherwise.

Implements ns3::NetDevice.

Definition at line 295 of file virtual-net-device.cc.

References m_supportsSendFrom.

Member Data Documentation

uint32_t ns3::VirtualNetDevice::m_index
private

Definition at line 166 of file virtual-net-device.h.

Referenced by GetIfIndex(), and SetIfIndex().

bool ns3::VirtualNetDevice::m_isPointToPoint
private

Definition at line 170 of file virtual-net-device.h.

Referenced by IsPointToPoint(), SetIsPointToPoint(), and VirtualNetDevice().

TracedCallback<Ptr<const Packet> > ns3::VirtualNetDevice::m_macPromiscRxTrace
private

Definition at line 159 of file virtual-net-device.h.

Referenced by GetTypeId(), and Receive().

TracedCallback<Ptr<const Packet> > ns3::VirtualNetDevice::m_macRxTrace
private

Definition at line 157 of file virtual-net-device.h.

Referenced by GetTypeId(), and Receive().

TracedCallback<Ptr<const Packet> > ns3::VirtualNetDevice::m_macTxTrace
private

Definition at line 158 of file virtual-net-device.h.

Referenced by GetTypeId(), Send(), and SendFrom().

uint16_t ns3::VirtualNetDevice::m_mtu
private

Definition at line 167 of file virtual-net-device.h.

Referenced by GetMtu(), and SetMtu().

Address ns3::VirtualNetDevice::m_myAddress
private

Definition at line 155 of file virtual-net-device.h.

Referenced by GetAddress(), and SetAddress().

std::string ns3::VirtualNetDevice::m_name
private

Definition at line 165 of file virtual-net-device.h.

bool ns3::VirtualNetDevice::m_needsArp
private

Definition at line 168 of file virtual-net-device.h.

Referenced by NeedsArp(), SetNeedsArp(), and VirtualNetDevice().

Ptr<Node> ns3::VirtualNetDevice::m_node
private

Definition at line 162 of file virtual-net-device.h.

Referenced by DoDispose(), GetNode(), and SetNode().

PromiscReceiveCallback ns3::VirtualNetDevice::m_promiscRxCallback
private

Definition at line 164 of file virtual-net-device.h.

Referenced by Receive(), and SetPromiscReceiveCallback().

TracedCallback<Ptr<const Packet> > ns3::VirtualNetDevice::m_promiscSnifferTrace
private

Definition at line 161 of file virtual-net-device.h.

Referenced by GetTypeId(), and Receive().

ReceiveCallback ns3::VirtualNetDevice::m_rxCallback
private

Definition at line 163 of file virtual-net-device.h.

Referenced by Receive(), and SetReceiveCallback().

SendCallback ns3::VirtualNetDevice::m_sendCb
private

Definition at line 156 of file virtual-net-device.h.

Referenced by Send(), SendFrom(), and SetSendCallback().

TracedCallback<Ptr<const Packet> > ns3::VirtualNetDevice::m_snifferTrace
private

Definition at line 160 of file virtual-net-device.h.

Referenced by GetTypeId(), and Receive().

bool ns3::VirtualNetDevice::m_supportsSendFrom
private

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