Fix bind_interface not working with auto_redirect

route/network.go

@@ -312,7 +312,7 @@ func (r *NetworkManager) AutoDetectInterfaceFunc() control.Func {
 		if r.interfaceMonitor == nil {
 			return nil
 		}
-		bindFunc := control.BindToInterfaceFunc(r.interfaceFinder, func(network string, address string) (interfaceName string, interfaceIndex int, err error) {
+		return control.BindToInterfaceFunc(r.interfaceFinder, func(network string, address string) (interfaceName string, interfaceIndex int, err error) {
 			remoteAddr := M.ParseSocksaddr(address).Addr
 			if remoteAddr.IsValid() {
 				iif, err := r.interfaceFinder.ByAddr(remoteAddr)
@@ -326,16 +326,6 @@ func (r *NetworkManager) AutoDetectInterfaceFunc() control.Func {
 			}
 			return defaultInterface.Name, defaultInterface.Index, nil
 		})
-		return func(network, address string, conn syscall.RawConn) error {
-			err := bindFunc(network, address, conn)
-			if err != nil {
-				return err
-			}
-			if r.autoRedirectOutputMark > 0 {
-				return control.RoutingMark(r.autoRedirectOutputMark)(network, address, conn)
-			}
-			return nil
-		}
 	}
 }
 
@@ -366,6 +356,15 @@ func (r *NetworkManager) AutoRedirectOutputMark() uint32 {
 	return r.autoRedirectOutputMark
 }
 
+func (r *NetworkManager) AutoRedirectOutputMarkFunc() control.Func {
+	return func(network, address string, conn syscall.RawConn) error {
+		if r.autoRedirectOutputMark == 0 {
+			return nil
+		}
+		return control.RoutingMark(r.autoRedirectOutputMark)(network, address, conn)
+	}
+}
+
 func (r *NetworkManager) NetworkMonitor() tun.NetworkUpdateMonitor {
 	return r.networkMonitor
 }