Close idle connections of unreferenced outbounds and DNS servers

protocol/tailscale/endpoint.go

@@ -68,6 +68,7 @@ import (
 var (
 	_ adapter.OutboundWithPreferredRoutes = (*Endpoint)(nil)
 	_ adapter.InterfaceUpdateListener     = (*Endpoint)(nil)
+	_ adapter.Referrer                    = (*Endpoint)(nil)
 	_ dialer.PacketDialerWithDestination  = (*Endpoint)(nil)
 	_ tun.Port                            = (*Endpoint)(nil)
 )
@@ -89,6 +90,7 @@ type Endpoint struct {
 	dnsRouter         adapter.DNSRouter
 	network           adapter.NetworkManager
 	platformInterface adapter.PlatformInterface
+	detour            string
 	server            *tsnet.Server
 	stack             *stack.Stack
 	icmpForwarder     *tun.ICMPForwarder
@@ -200,6 +202,7 @@ func NewEndpoint(ctx context.Context, router adapter.Router, logger log.ContextL
 		queryOptions:      dialerQueryOptions,
 		network:           service.FromContext[adapter.NetworkManager](ctx),
 		platformInterface: platformInterface,
+		detour:            options.Detour,
 		server: &tsnet.Server{
 			Dir:      stateDirectory,
 			Hostname: hostname,
@@ -251,6 +254,13 @@ func NewEndpoint(ctx context.Context, router adapter.Router, logger log.ContextL
 	}, nil
 }
 
+func (t *Endpoint) References() []string {
+	if t.detour == "" {
+		return nil
+	}
+	return []string{t.detour}
+}
+
 func (t *Endpoint) Start(stage adapter.StartStage) error {
 	switch stage {
 	case adapter.StartStateInitialize: