diff --git a/metropolis/node/kubernetes/containerd/cniproxy/opts.go b/metropolis/node/kubernetes/containerd/cniproxy/opts.go
new file mode 100644
index 0000000..0316276
--- /dev/null
+++ b/metropolis/node/kubernetes/containerd/cniproxy/opts.go
@@ -0,0 +1,58 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package cni
+
+// Opt doesn't do anything as all configuration is ignored.
+type Opt func() error
+
+func noopOpt() error {
+	return nil
+}
+
+func WithConf(bytes []byte) Opt {
+	return noopOpt
+}
+
+func WithConfFile(fileName string) Opt {
+	return noopOpt
+}
+
+func WithConfIndex(bytes []byte, index int) Opt {
+	return noopOpt
+}
+
+func WithConfListBytes(bytes []byte) Opt {
+	return noopOpt
+}
+
+func WithConfListFile(fileName string) Opt {
+	return noopOpt
+}
+
+func WithInterfacePrefix(prefix string) Opt {
+	return noopOpt
+}
+
+func WithMinNetworkCount(count int) Opt {
+	return noopOpt
+}
+
+func WithPluginConfDir(dir string) Opt {
+	return noopOpt
+}
+
+func WithPluginDir(dirs []string) Opt {
+	return noopOpt
+}
+
+func WithPluginMaxConfNum(max int) Opt {
+	return noopOpt
+}
+
+func WithDefaultConf() error {
+	return nil
+}
+func WithLoNetwork() error {
+	return nil
+}