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Support for Linux ethernet and IP tunnel devices.
@see: U{https://en.wikipedia.org/wiki/TUN/TAP}
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L{TunnelFlags} defines more flags which are used to configure the behavior
of a tunnel device.
@cvar IFF_TUN: This indicates a I{tun}-type device. This type of tunnel
carries IP datagrams. This flag is mutually exclusive with C{IFF_TAP}.
@cvar IFF_TAP: This indicates a I{tap}-type device. This type of tunnel
carries ethernet frames. This flag is mutually exclusive with C{IFF_TUN}.
@cvar IFF_NO_PI: This indicates the I{protocol information} header will
B{not} be included in data read from the tunnel.
@see: U{https://www.kernel.org/doc/Documentation/networking/tuntap.txt}
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A L{TunnelAddress} represents the tunnel to which a L{TuntapPort} is bound.
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@param type: Either L{TunnelFlags.IFF_TUN} or L{TunnelFlags.IFF_TAP},
representing the type of this tunnel.
@param name: The system name of the tunnel.
@type name: L{bytes}
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Deprecated accessor for the tunnel name. Use attributes instead.
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Describe an existing tunnel.
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@type name: L{bytes}
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@see: L{os.read}
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@see: L{os.write}
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Send a datagram to a certain address.
@param datagram: The payload of a UDP datagram to send.
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@return: The local address from which the datagram was sent.
@rtype: L{tuple} of (L{bytes}, L{int})
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Return a socket which can be used to receive datagrams sent to the
given address.
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datagram was either sent via or will be received via.
@type fileno: L{int}
@param host: The IPv4 address at which the datagram will be received.
@type host: L{bytes}
@param port: The UDP port number at which the datagram will be
received.
@type port: L{int}
@return: A L{socket.socket} which can be used to receive the specified
datagram.
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An interface to the parts of the operating system which L{TuntapPort}
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A Port that reads and writes packets from/to a TUN/TAP-device.
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Create and bind my socket, and begin listening on it.
This must be called after creating a server to begin listening on the
specified tunnel.
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Open the named tunnel using the given mode.
@param name: The name of the tunnel to open.
@type name: L{bytes}
@param mode: Flags from L{TunnelFlags} with exactly one of
L{TunnelFlags.IFF_TUN} or L{TunnelFlags.IFF_TAP} set.
@return: A L{_TunnelDescription} representing the newly opened tunnel.
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Open the tunnel.
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Write the given data as a single datagram.
@param datagram: The data that will make up the complete datagram to be
written.
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@param seq: The data that will make up the complete datagram to be
written.
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Stop accepting connections on this port.
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@return: A L{Deferred} that fires when this port has stopped.
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Close this tunnel. Use L{TuntapPort.stopListening} instead.
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Cleans up my socket.
@param reason: Ignored. Do not use this.
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Returns the name of my class, to prefix log entries with.
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Get the local address of this L{TuntapPort}.
@return: A L{TunnelAddress} which describes the tunnel device to which
this object is bound.
@rtype: L{TunnelAddress}
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