type Impl struct {// GetTCPHandlerForFlow conditionally handles an incoming TCP flow for the// provided (src/port, dst/port) 4-tuple.//// A nil value is equivalent to a func returning (nil, false).//// If func returns intercept=false, the default forwarding behavior (if// ProcessLocalIPs and/or ProcesssSubnetIPs) takes place.//// When intercept=true, the behavior depends on whether the returned handler// is non-nil: if nil, the connection is rejected. If non-nil, handler takes// over the TCP conn.GetTCPHandlerForFlow func(src, dstnetip.AddrPort) (handler func(net.Conn), interceptbool)// GetUDPHandlerForFlow conditionally handles an incoming UDP flow for the// provided (src/port, dst/port) 4-tuple.//// A nil value is equivalent to a func returning (nil, false).//// If func returns intercept=false, the default forwarding behavior (if// ProcessLocalIPs and/or ProcesssSubnetIPs) takes place.//// When intercept=true, the behavior depends on whether the returned handler// is non-nil: if nil, the connection is rejected. If non-nil, handler takes// over the UDP flow.GetUDPHandlerForFlow func(src, dstnetip.AddrPort) (handler func(nettype.ConnPacketConn), interceptbool)// ProcessLocalIPs is whether netstack should handle incoming// traffic directed at the Node.Addresses (local IPs).// It can only be set before calling Start.ProcessLocalIPsbool// ProcessSubnets is whether netstack should handle incoming// traffic destined to non-local IPs (i.e. whether it should// be a subnet router).// It can only be set before calling Start.ProcessSubnetsbool// contains filtered or unexported fields}

funcCreate¶added inv1.6.0

func Create(logflogger.Logf, tundev *tstun.Wrapper, ewgengine.Engine, mc *magicsock.Conn, dialer *tsdial.Dialer, dns *dns.Manager, pm *proxymap.Mapper) (*Impl,error)

Create creates and populates a new Impl.

func (*Impl)Close¶added inv1.20.2

func (ns *Impl) Close()error

func (*Impl)DialContextTCP¶added inv1.6.0

func (ns *Impl) DialContextTCP(ctxcontext.Context, ippnetip.AddrPort) (*gonet.TCPConn,error)

func (*Impl)DialContextTCPWithBind¶added inv1.82.0

func (ns *Impl) DialContextTCPWithBind(ctxcontext.Context, localAddrnetip.Addr, remoteAddrnetip.AddrPort) (*gonet.TCPConn,error)

DialContextTCPWithBind creates a new gonet.TCPConn connected to the specifiedremoteAddress with its local address bound to localAddr on an available port.

func (*Impl)DialContextUDP¶added inv1.10.0

func (ns *Impl) DialContextUDP(ctxcontext.Context, ippnetip.AddrPort) (*gonet.UDPConn,error)

func (*Impl)DialContextUDPWithBind¶added inv1.82.0

func (ns *Impl) DialContextUDPWithBind(ctxcontext.Context, localAddrnetip.Addr, remoteAddrnetip.AddrPort) (*gonet.UDPConn,error)

DialContextUDPWithBind creates a new gonet.UDPConn. Connected to remoteAddr.With its local address bound to localAddr on an available port.

func (*Impl)ExpVar¶added inv1.60.0

func (ns *Impl) ExpVar()expvar.Var

ExpVar returns an expvar variable suitable for registering with expvar.Publish.

func (*Impl)ListenPacket¶added inv1.68.0

func (ns *Impl) ListenPacket(network, addressstring) (net.PacketConn,error)

ListenPacket listens for incoming packets for the given network and address.Address must be of the form "ip:port" or "[ip]:port".

As of 2024-05-18, only udp4 and udp6 are supported.

func (*Impl)SetTransportProtocolOption¶added inv1.80.0

func (ns *Impl) SetTransportProtocolOption(transporttcpip.TransportProtocolNumber, optiontcpip.SettableTransportProtocolOption)tcpip.Error

SetTransportProtocolOption forwards to the underlyingstack.Stack.SetTransportProtocolOption. Callers are responsible forensuring that the options are valid, compatible and appropriate for their usecase. Compatibility may change at any version.

func (*Impl)Start¶added inv1.6.0

func (ns *Impl) Start(bLocalBackend)error

Start sets up all the handlers so netstack can start working. Implementswgengine.FakeImpl.

func (*Impl)UpdateNetstackIPs¶added inv1.50.0

func (ns *Impl) UpdateNetstackIPs(nm *netmap.NetworkMap)

UpdateNetstackIPs updates the set of local IPs that netstack should handlefrom nm.

TODO(bradfitz): don't pass the whole netmap here; just pass the twoaddress slice views.

type LocalBackend =any