c71c789184
Move NetIdManager and ProfileNetworkPreferences from services/core to packages/Connectivity/service. This is a partial cherry-pick of a downstream change. Bug: 186628461 Test: m Merged-In: I454e8a0a8d0e0f9e6d21a8e8faf5a9e299962ad4 Change-Id: I6734c181dac39518b8d69be1e49d7f5f0a0a18da
90 lines
2.7 KiB
Java
90 lines
2.7 KiB
Java
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.annotation.NonNull;
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import android.net.ConnectivityManager;
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import android.util.SparseBooleanArray;
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import com.android.internal.annotations.GuardedBy;
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import com.android.internal.annotations.VisibleForTesting;
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/**
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* Class used to reserve and release net IDs.
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*
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* <p>Instances of this class are thread-safe.
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*/
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public class NetIdManager {
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// Sequence number for Networks; keep in sync with system/netd/NetworkController.cpp
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public static final int MIN_NET_ID = 100; // some reserved marks
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// Top IDs reserved by IpSecService
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public static final int MAX_NET_ID = ConnectivityManager.getIpSecNetIdRange().getLower() - 1;
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@GuardedBy("mNetIdInUse")
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private final SparseBooleanArray mNetIdInUse = new SparseBooleanArray();
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@GuardedBy("mNetIdInUse")
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private int mLastNetId = MIN_NET_ID - 1;
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private final int mMaxNetId;
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public NetIdManager() {
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this(MAX_NET_ID);
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}
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@VisibleForTesting
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NetIdManager(int maxNetId) {
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mMaxNetId = maxNetId;
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}
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/**
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* Get the first netId that follows the provided lastId and is available.
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*/
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private int getNextAvailableNetIdLocked(
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int lastId, @NonNull SparseBooleanArray netIdInUse) {
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int netId = lastId;
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for (int i = MIN_NET_ID; i <= mMaxNetId; i++) {
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netId = netId < mMaxNetId ? netId + 1 : MIN_NET_ID;
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if (!netIdInUse.get(netId)) {
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return netId;
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}
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}
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throw new IllegalStateException("No free netIds");
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}
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/**
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* Reserve a new ID for a network.
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*/
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public int reserveNetId() {
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synchronized (mNetIdInUse) {
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mLastNetId = getNextAvailableNetIdLocked(mLastNetId, mNetIdInUse);
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// Make sure NetID unused. http://b/16815182
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mNetIdInUse.put(mLastNetId, true);
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return mLastNetId;
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}
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}
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/**
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* Clear a previously reserved ID for a network.
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*/
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public void releaseNetId(int id) {
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synchronized (mNetIdInUse) {
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mNetIdInUse.delete(id);
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}
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}
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}
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