Update containernetworking/cni to v1.2.3 for GC

Signed-off-by: Dan Winship <danwinship@redhat.com>

vendor/github.com/containernetworking/cni/pkg/ns/ns_darwin.go

@@ -0,0 +1,21 @@
+// Copyright 2022 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ns
+
+import "github.com/containernetworking/cni/pkg/types"
+
+func CheckNetNS(nsPath string) (bool, *types.Error) {
+	return false, nil
+}

vendor/github.com/containernetworking/cni/pkg/ns/ns_linux.go

@@ -0,0 +1,50 @@
+// Copyright 2022 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ns
+
+import (
+	"runtime"
+
+	"github.com/vishvananda/netns"
+
+	"github.com/containernetworking/cni/pkg/types"
+)
+
+// Returns an object representing the current OS thread's network namespace
+func getCurrentNS() (netns.NsHandle, error) {
+	// Lock the thread in case other goroutine executes in it and changes its
+	// network namespace after getCurrentThreadNetNSPath(), otherwise it might
+	// return an unexpected network namespace.
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	return netns.Get()
+}
+
+func CheckNetNS(nsPath string) (bool, *types.Error) {
+	ns, err := netns.GetFromPath(nsPath)
+	// Let plugins check whether nsPath from args is valid. Also support CNI DEL for empty nsPath as already-deleted nsPath.
+	if err != nil {
+		return false, nil
+	}
+	defer ns.Close()
+
+	pluginNS, err := getCurrentNS()
+	if err != nil {
+		return false, types.NewError(types.ErrInvalidNetNS, "get plugin's netns failed", "")
+	}
+	defer pluginNS.Close()
+
+	return pluginNS.Equal(ns), nil
+}

vendor/github.com/containernetworking/cni/pkg/ns/ns_windows.go

@@ -0,0 +1,21 @@
+// Copyright 2022 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ns
+
+import "github.com/containernetworking/cni/pkg/types"
+
+func CheckNetNS(nsPath string) (bool, *types.Error) {
+	return false, nil
+}