Move connectivity sources to packages/Connectivity
The service-connectivity sources should be in
packages/modules/Connectivity. Move them to
frameworks/base/packages/Connectivity, so that the whole directory can
be moved to the dedicated packages/modules/Connectivity git project.
Bug: 186628461
Test: m
Change-Id: I26d1a274058fa38763ad4f605549d880865b4d76
diff --git a/service/src/com/android/server/NetIdManager.java b/service/src/com/android/server/NetIdManager.java
new file mode 100644
index 0000000..61925c8
--- /dev/null
+++ b/service/src/com/android/server/NetIdManager.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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 com.android.server;
+
+import android.annotation.NonNull;
+import android.net.ConnectivityManager;
+import android.util.SparseBooleanArray;
+
+import com.android.internal.annotations.GuardedBy;
+import com.android.internal.annotations.VisibleForTesting;
+
+/**
+ * Class used to reserve and release net IDs.
+ *
+ * <p>Instances of this class are thread-safe.
+ */
+public class NetIdManager {
+ // Sequence number for Networks; keep in sync with system/netd/NetworkController.cpp
+ public static final int MIN_NET_ID = 100; // some reserved marks
+ // Top IDs reserved by IpSecService
+ public static final int MAX_NET_ID = ConnectivityManager.getIpSecNetIdRange().getLower() - 1;
+
+ @GuardedBy("mNetIdInUse")
+ private final SparseBooleanArray mNetIdInUse = new SparseBooleanArray();
+
+ @GuardedBy("mNetIdInUse")
+ private int mLastNetId = MIN_NET_ID - 1;
+
+ private final int mMaxNetId;
+
+ public NetIdManager() {
+ this(MAX_NET_ID);
+ }
+
+ @VisibleForTesting
+ NetIdManager(int maxNetId) {
+ mMaxNetId = maxNetId;
+ }
+
+ /**
+ * Get the first netId that follows the provided lastId and is available.
+ */
+ private int getNextAvailableNetIdLocked(
+ int lastId, @NonNull SparseBooleanArray netIdInUse) {
+ int netId = lastId;
+ for (int i = MIN_NET_ID; i <= mMaxNetId; i++) {
+ netId = netId < mMaxNetId ? netId + 1 : MIN_NET_ID;
+ if (!netIdInUse.get(netId)) {
+ return netId;
+ }
+ }
+ throw new IllegalStateException("No free netIds");
+ }
+
+ /**
+ * Reserve a new ID for a network.
+ */
+ public int reserveNetId() {
+ synchronized (mNetIdInUse) {
+ mLastNetId = getNextAvailableNetIdLocked(mLastNetId, mNetIdInUse);
+ // Make sure NetID unused. http://b/16815182
+ mNetIdInUse.put(mLastNetId, true);
+ return mLastNetId;
+ }
+ }
+
+ /**
+ * Clear a previously reserved ID for a network.
+ */
+ public void releaseNetId(int id) {
+ synchronized (mNetIdInUse) {
+ mNetIdInUse.delete(id);
+ }
+ }
+}