refactort: extract method to create Wireguard interface using kernel module

iface/iface.go

@@ -5,5 +5,5 @@ package iface
 // Create Creates a new Wireguard interface, sets a given IP and brings it up.
 // Will reuse an existing one.
 func Create(iface string, address string) error {
-	return CreateInUserspace(iface, address)
+	return CreateWithUserspace(iface, address)
 }

iface/iface_configuration.go

@@ -26,8 +26,8 @@ func ConfigureWithKeyGen(iface string) (*wgtypes.Key, error) {
 	return &key, Configure(iface, key.String())
 }
 
-// CreateInUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
-func CreateInUserspace(iface string, address string) error {
+// CreateWithUserspace Creates a new Wireguard interface, using wireguard-go userspace implementation
+func CreateWithUserspace(iface string, address string) error {
 	var err error
 	tunIface, err := tun.CreateTUN(iface, defaultMTU)
 	if err != nil {

iface/iface_linux.go

@@ -11,6 +11,16 @@ import (
 func Create(iface string, address string) error {
 
 	if WireguardModExists() {
+		return CreateWithKernel(iface, address)
+	} else {
+		return CreateWithUserspace(iface, address)
+	}
+
+}
+
+// CreateWithKernel Creates a new Wireguard interface using kernel Wireguard module.
+// Works for Linux and offers much better network performance
+func CreateWithKernel(iface string, address string) error {
 	attrs := netlink.NewLinkAttrs()
 	attrs.Name = iface
 
@@ -55,10 +65,6 @@ func Create(iface string, address string) error {
 	}
 
 	return nil
-	} else {
-		return CreateInUserspace(iface, address)
-	}
-
 }
 
 // assignAddr Adds IP address to the tunnel interface