Added new flannel backend to use wireguard from flannel

pkg/agent/flannel/setup.go

@@ -75,6 +75,11 @@ const (
 	"SubnetRemoveCommand": "read PUBLICKEY; wg set flannel.1 peer $PUBLICKEY remove"
 }`
 
+	wireguardNativeBackend = `{
+	"Type": "wireguard",
+	"PersistentKeepaliveInterval": 25
+}`
+
 	emptyIPv6Network = "::/0"
 
 	ipv4 = iota
@@ -199,6 +204,8 @@ func createFlannelConf(nodeConfig *config.Node) error {
 		}
 	case config.FlannelBackendWireguard:
 		backendConf = strings.ReplaceAll(wireguardBackend, "%flannelConfDir%", filepath.Dir(nodeConfig.FlannelConfFile))
+	case config.FlannelBackendNativeWireguard:
+		backendConf = wireguardNativeBackend
 	default:
 		return fmt.Errorf("Cannot configure unknown flannel backend '%s'", nodeConfig.FlannelBackend)
 	}

pkg/daemons/config/types.go

@@ -22,6 +22,7 @@ const (
 	FlannelBackendHostGW          = "host-gw"
 	FlannelBackendIPSEC           = "ipsec"
 	FlannelBackendWireguard       = "wireguard"
+	FlannelBackendNativeWireguard = "native-wireguard"
 	CertificateRenewDays          = 90
 )