Add ping support for WireGuard endpoint

transport/wireguard/device_nat_non_gvisor.go

@@ -0,0 +1,20 @@
+//go:build !with_gvisor
+
+package wireguard
+
+type gVisorOutbound struct{}
+
+func newGVisorOutbound() gVisorOutbound {
+	return gVisorOutbound{}
+}
+
+func (d *natDeviceWrapper) Read(bufs [][]byte, sizes []int, offset int) (n int, err error) {
+	select {
+	case packet := <-d.packetOutbound:
+		defer packet.Release()
+		sizes[0] = copy(bufs[0][offset:], packet.Bytes())
+		return 1, nil
+	default:
+	}
+	return d.Device.Read(bufs, sizes, offset)
+}