use wg tun library; batching & locking improvements

test/device/noop.go

@@ -0,0 +1,63 @@
+package device
+
+import (
+	"errors"
+	"io"
+	"net/netip"
+
+	"github.com/slackhq/nebula/overlay"
+	"github.com/slackhq/nebula/routing"
+)
+
+type NoopTun struct{}
+
+func (NoopTun) RoutesFor(addr netip.Addr) routing.Gateways {
+	return routing.Gateways{}
+}
+
+func (NoopTun) Activate() error {
+	return nil
+}
+
+func (NoopTun) Networks() []netip.Prefix {
+	return []netip.Prefix{}
+}
+
+func (NoopTun) Name() string {
+	return "noop"
+}
+
+func (NoopTun) Read([]byte) (int, error) {
+	return 0, nil
+}
+
+func (NoopTun) Write([]byte) (int, error) {
+	return 0, nil
+}
+
+func (NoopTun) SupportsMultiqueue() bool {
+	return false
+}
+
+func (NoopTun) NewMultiQueueReader() (overlay.BatchReadWriter, error) {
+	return nil, errors.New("unsupported")
+}
+
+func (NoopTun) Close() error {
+	return nil
+}
+
+// BatchRead implements BatchReadWriter interface
+func (NoopTun) BatchRead(bufs [][]byte, sizes []int) (int, error) {
+	return 0, io.EOF
+}
+
+// WriteBatch implements BatchReadWriter interface
+func (NoopTun) WriteBatch(bufs [][]byte, offset int) (int, error) {
+	return len(bufs), nil
+}
+
+// BatchSize implements BatchReadWriter interface
+func (NoopTun) BatchSize() int {
+	return 1
+}