diff --git a/vendor/github.com/google/gopacket/layers/bitfield.go b/vendor/github.com/google/gopacket/layers/bitfield.go
new file mode 100644
index 0000000..7d54acf
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/bitfield.go
@@ -0,0 +1,18 @@
+// Copyright 2021 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+type bitfield [1024]uint64
+
+// set sets bit i in bitfield b to 1.
+func (b *bitfield) set(i uint16) {
+	b[i>>6] |= (1 << (i & 0x3f))
+}
+
+// has reports whether bit i is set to 1 in bitfield b.
+func (b *bitfield) has(i uint16) bool {
+	return b[i>>6]&(1<<(i&0x3f)) != 0
+}