Monitor interface added and update bpf interface map (eaca9e9a) · Commits · e / os / android_frameworks_base

packages/ConnectivityT/service/Android.bp

+27 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,8 @@ filegroup {
		srcs: [
		"src/com/android/server/net/NetworkIdentity*.java",
		"src/com/android/server/net/NetworkStats*.java",
		"src/com/android/server/net/BpfInterfaceMapUpdater.java",
		"src/com/android/server/net/InterfaceMapValue.java",
		],
		path: "src",
		visibility: [
		@@ -97,3 +99,28 @@ filegroup {
		"//packages/modules/Connectivity:__subpackages__",
		],
		}

		cc_library_shared {
		name: "libcom_android_net_module_util_jni",
		min_sdk_version: "30",
		cflags: [
		"-Wall",
		"-Werror",
		"-Wno-unused-parameter",
		"-Wthread-safety",
		],
		srcs: [
		"jni/onload.cpp",
		],
		stl: "libc++_static",
		static_libs: [
		"libnet_utils_device_common_bpfjni",
		],
		shared_libs: [
		"liblog",
		"libnativehelper",
		],
		apex_available: [
		"//apex_available:platform",
		],
		}

packages/ConnectivityT/service/jni/onload.cpp

0 → 100644

+38 −0

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		/*
		* Copyright (C) 2022 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.
		*/

		#include <nativehelper/JNIHelp.h>
		#include <log/log.h>

		namespace android {

		int register_com_android_net_module_util_BpfMap(JNIEnv* env, char const* class_name);

		extern "C" jint JNI_OnLoad(JavaVM* vm, void*) {
		JNIEnv *env;
		if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
		ALOGE("GetEnv failed");
		return JNI_ERR;
		}

		if (register_com_android_net_module_util_BpfMap(env,
		"com/android/net/module/util/BpfMap") < 0) return JNI_ERR;

		return JNI_VERSION_1_6;
		}

		};

packages/ConnectivityT/service/src/com/android/server/net/BpfInterfaceMapUpdater.java

0 → 100644

+139 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2022 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.net;

		import android.content.Context;
		import android.net.INetd;
		import android.os.Handler;
		import android.os.IBinder;
		import android.os.RemoteException;
		import android.os.ServiceSpecificException;
		import android.system.ErrnoException;
		import android.util.Log;

		import com.android.internal.annotations.VisibleForTesting;
		import com.android.net.module.util.BaseNetdUnsolicitedEventListener;
		import com.android.net.module.util.BpfMap;
		import com.android.net.module.util.IBpfMap;
		import com.android.net.module.util.InterfaceParams;
		import com.android.net.module.util.Struct.U32;

		/**
		* Monitor interface added (without removed) and right interface name and its index to bpf map.
		*/
		public class BpfInterfaceMapUpdater {
		private static final String TAG = BpfInterfaceMapUpdater.class.getSimpleName();
		// This is current path but may be changed soon.
		private static final String IFACE_INDEX_NAME_MAP_PATH =
		"/sys/fs/bpf/map_netd_iface_index_name_map";
		private final IBpfMap<U32, InterfaceMapValue> mBpfMap;
		private final INetd mNetd;
		private final Handler mHandler;
		private final Dependencies mDeps;

		public BpfInterfaceMapUpdater(Context ctx, Handler handler) {
		this(ctx, handler, new Dependencies());
		}

		@VisibleForTesting
		public BpfInterfaceMapUpdater(Context ctx, Handler handler, Dependencies deps) {
		mDeps = deps;
		mBpfMap = deps.getInterfaceMap();
		mNetd = deps.getINetd(ctx);
		mHandler = handler;
		}

		/**
		* Dependencies of BpfInerfaceMapUpdater, for injection in tests.
		*/
		@VisibleForTesting
		public static class Dependencies {
		/** Create BpfMap for updating interface and index mapping. */
		public IBpfMap<U32, InterfaceMapValue> getInterfaceMap() {
		try {
		return new BpfMap<>(IFACE_INDEX_NAME_MAP_PATH, BpfMap.BPF_F_RDWR,
		U32.class, InterfaceMapValue.class);
		} catch (ErrnoException e) {
		Log.e(TAG, "Cannot create interface map: " + e);
		return null;
		}
		}

		/** Get InterfaceParams for giving interface name. */
		public InterfaceParams getInterfaceParams(String ifaceName) {
		return InterfaceParams.getByName(ifaceName);
		}

		/** Get INetd binder object. */
		public INetd getINetd(Context ctx) {
		return INetd.Stub.asInterface((IBinder) ctx.getSystemService(Context.NETD_SERVICE));
		}
		}

		/**
		* Start listening interface update event.
		* Query current interface names before listening.
		*/
		public void start() {
		mHandler.post(() -> {
		if (mBpfMap == null) {
		Log.wtf(TAG, "Fail to start: Null bpf map");
		return;
		}

		try {
		// TODO: use a NetlinkMonitor and listen for RTM_NEWLINK messages instead.
		mNetd.registerUnsolicitedEventListener(new InterfaceChangeObserver());
		} catch (RemoteException e) {
		Log.wtf(TAG, "Unable to register netd UnsolicitedEventListener, " + e);
		}

		final String[] ifaces;
		try {
		// TODO: use a netlink dump to get the current interface list.
		ifaces = mNetd.interfaceGetList();
		} catch (RemoteException \| ServiceSpecificException e) {
		Log.wtf(TAG, "Unable to query interface names by netd, " + e);
		return;
		}

		for (String ifaceName : ifaces) {
		addInterface(ifaceName);
		}
		});
		}

		private void addInterface(String ifaceName) {
		final InterfaceParams iface = mDeps.getInterfaceParams(ifaceName);
		if (iface == null) {
		Log.e(TAG, "Unable to get InterfaceParams for " + ifaceName);
		return;
		}

		try {
		mBpfMap.updateEntry(new U32(iface.index), new InterfaceMapValue(ifaceName));
		} catch (ErrnoException e) {
		Log.e(TAG, "Unable to update entry for " + ifaceName + ", " + e);
		}
		}

		private class InterfaceChangeObserver extends BaseNetdUnsolicitedEventListener {
		@Override
		public void onInterfaceAdded(String ifName) {
		mHandler.post(() -> addInterface(ifName));
		}
		}
		}

packages/ConnectivityT/service/src/com/android/server/net/InterfaceMapValue.java

0 → 100644

+35 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 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.net;

		import com.android.net.module.util.Struct;
		import com.android.net.module.util.Struct.Field;
		import com.android.net.module.util.Struct.Type;

		/**
		* The value of bpf interface index map which is used for NetworkStatsService.
		*/
		public class InterfaceMapValue extends Struct {
		@Field(order = 0, type = Type.ByteArray, arraysize = 16)
		public final byte[] interfaceName;

		public InterfaceMapValue(String iface) {
		final byte[] ifaceArray = iface.getBytes();
		interfaceName = new byte[16];
		// All array bytes after the interface name, if any, must be 0.
		System.arraycopy(ifaceArray, 0, interfaceName, 0, ifaceArray.length);
		}
		}

packages/ConnectivityT/service/src/com/android/server/net/NetworkStatsService.java

+12 −0

Original line number	Diff line number	Diff line
		@@ -356,6 +356,9 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
		@NonNull
		private final LocationPermissionChecker mLocationPermissionChecker;

		@NonNull
		private final BpfInterfaceMapUpdater mInterfaceMapUpdater;

		private static @NonNull File getDefaultSystemDir() {
		return new File(Environment.getDataDirectory(), "system");
		}
		@@ -453,6 +456,8 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
		mContentObserver = mDeps.makeContentObserver(mHandler, mSettings,
		mNetworkStatsSubscriptionsMonitor);
		mLocationPermissionChecker = mDeps.makeLocationPermissionChecker(mContext);
		mInterfaceMapUpdater = mDeps.makeBpfInterfaceMapUpdater(mContext, mHandler);
		mInterfaceMapUpdater.start();
		}

		/**
		@@ -507,6 +512,13 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
		public LocationPermissionChecker makeLocationPermissionChecker(final Context context) {
		return new LocationPermissionChecker(context);
		}

		/** Create BpfInterfaceMapUpdater to update bpf interface map. */
		@NonNull
		public BpfInterfaceMapUpdater makeBpfInterfaceMapUpdater(
		@NonNull Context ctx, @NonNull Handler handler) {
		return new BpfInterfaceMapUpdater(ctx, handler);
		}
		}

		/**