Fix license heander

pkg/provider/loadbalancer/iputil/internal/prefix.go

@@ -1,9 +1,29 @@
+/*
+Copyright 2024 The Kubernetes 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 internal
 
 import (
 	"net/netip"
 )
 
+// ListAddresses returns all IP addresses contained within the given prefixes.
+// Note: This function is not optimized for large address ranges.
+// It may consume significant memory and perform poorly when listing
+// a large number of addresses. Use with caution on large prefixes.
 func ListAddresses(prefixes ...netip.Prefix) []netip.Addr {
 	var rv []netip.Addr
 	for _, p := range prefixes {

pkg/provider/loadbalancer/iputil/internal/prefix_test.go

@@ -1,3 +1,19 @@
+/*
+Copyright 2024 The Kubernetes 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 internal
 
 import (

pkg/provider/loadbalancer/iputil/internal/prefixtree_test.go

@@ -20,11 +20,12 @@ import (
 	"fmt"
 	"math"
 	"net/netip"
-	"sigs.k8s.io/cloud-provider-azure/pkg/provider/loadbalancer/fnutil"
 	"sort"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+
+	"sigs.k8s.io/cloud-provider-azure/pkg/provider/loadbalancer/fnutil"
 )
 
 func Test_bitAt(t *testing.T) {