Add ping support for WireGuard endpoint

transport/wireguard/device_nat_gvisor.go

@@ -0,0 +1,48 @@
+//go:build with_gvisor
+
+package wireguard
+
+import (
+	"github.com/sagernet/gvisor/pkg/tcpip/stack"
+)
+
+type gVisorOutbound struct {
+	outbound chan *stack.PacketBuffer
+}
+
+func newGVisorOutbound() gVisorOutbound {
+	return gVisorOutbound{
+		outbound: make(chan *stack.PacketBuffer, 256),
+	}
+}
+
+func (d *natDeviceWrapper) Read(bufs [][]byte, sizes []int, offset int) (n int, err error) {
+	select {
+	case packet := <-d.outbound:
+		defer packet.DecRef()
+		var copyN int
+		/*rangeIterate(packet.Data().AsRange(), func(view *buffer.View) {
+			copyN += copy(bufs[0][offset+copyN:], view.AsSlice())
+		})*/
+		for _, view := range packet.AsSlices() {
+			copyN += copy(bufs[0][offset+copyN:], view)
+		}
+		sizes[0] = copyN
+		return 1, nil
+	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)
+}
+
+func (d *natDestinationWrapper) WritePacketBuffer(packetBuffer *stack.PacketBuffer) error {
+	println("read from wg")
+	if d.device.writer != nil {
+		d.device.writer.RewritePacketBuffer(packetBuffer)
+	}
+	d.device.outbound <- packetBuffer
+	return nil
+}