| /* |
| * Copyright (C) 2011 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.internal.net; |
| |
| import static android.net.NetworkStats.SET_ALL; |
| import static android.net.NetworkStats.TAG_ALL; |
| import static android.net.NetworkStats.TAG_NONE; |
| import static android.net.NetworkStats.UID_ALL; |
| import static com.android.server.NetworkManagementSocketTagger.kernelToTag; |
| |
| import android.net.NetworkStats; |
| import android.os.StrictMode; |
| import android.os.SystemClock; |
| import android.util.ArrayMap; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.ArrayUtils; |
| import com.android.internal.util.ProcFileReader; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.net.ProtocolException; |
| import java.util.Objects; |
| |
| /** |
| * Creates {@link NetworkStats} instances by parsing various {@code /proc/} |
| * files as needed. |
| */ |
| public class NetworkStatsFactory { |
| private static final String TAG = "NetworkStatsFactory"; |
| |
| private static final boolean USE_NATIVE_PARSING = true; |
| private static final boolean SANITY_CHECK_NATIVE = false; |
| |
| private static final String CLATD_INTERFACE_PREFIX = "v4-"; |
| // Delta between IPv4 header (20b) and IPv6 header (40b). |
| // Used for correct stats accounting on clatd interfaces. |
| private static final int IPV4V6_HEADER_DELTA = 20; |
| |
| /** Path to {@code /proc/net/xt_qtaguid/iface_stat_all}. */ |
| private final File mStatsXtIfaceAll; |
| /** Path to {@code /proc/net/xt_qtaguid/iface_stat_fmt}. */ |
| private final File mStatsXtIfaceFmt; |
| /** Path to {@code /proc/net/xt_qtaguid/stats}. */ |
| private final File mStatsXtUid; |
| |
| // TODO: to improve testability and avoid global state, do not use a static variable. |
| @GuardedBy("sStackedIfaces") |
| private static final ArrayMap<String, String> sStackedIfaces = new ArrayMap<>(); |
| |
| public static void noteStackedIface(String stackedIface, String baseIface) { |
| synchronized (sStackedIfaces) { |
| if (baseIface != null) { |
| sStackedIfaces.put(stackedIface, baseIface); |
| } else { |
| sStackedIfaces.remove(stackedIface); |
| } |
| } |
| } |
| |
| public NetworkStatsFactory() { |
| this(new File("/proc/")); |
| } |
| |
| @VisibleForTesting |
| public NetworkStatsFactory(File procRoot) { |
| mStatsXtIfaceAll = new File(procRoot, "net/xt_qtaguid/iface_stat_all"); |
| mStatsXtIfaceFmt = new File(procRoot, "net/xt_qtaguid/iface_stat_fmt"); |
| mStatsXtUid = new File(procRoot, "net/xt_qtaguid/stats"); |
| } |
| |
| /** |
| * Parse and return interface-level summary {@link NetworkStats} measured |
| * using {@code /proc/net/dev} style hooks, which may include non IP layer |
| * traffic. Values monotonically increase since device boot, and may include |
| * details about inactive interfaces. |
| * |
| * @throws IllegalStateException when problem parsing stats. |
| */ |
| public NetworkStats readNetworkStatsSummaryDev() throws IOException { |
| final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); |
| |
| final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6); |
| final NetworkStats.Entry entry = new NetworkStats.Entry(); |
| |
| ProcFileReader reader = null; |
| try { |
| reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceAll)); |
| |
| while (reader.hasMoreData()) { |
| entry.iface = reader.nextString(); |
| entry.uid = UID_ALL; |
| entry.set = SET_ALL; |
| entry.tag = TAG_NONE; |
| |
| final boolean active = reader.nextInt() != 0; |
| |
| // always include snapshot values |
| entry.rxBytes = reader.nextLong(); |
| entry.rxPackets = reader.nextLong(); |
| entry.txBytes = reader.nextLong(); |
| entry.txPackets = reader.nextLong(); |
| |
| // fold in active numbers, but only when active |
| if (active) { |
| entry.rxBytes += reader.nextLong(); |
| entry.rxPackets += reader.nextLong(); |
| entry.txBytes += reader.nextLong(); |
| entry.txPackets += reader.nextLong(); |
| } |
| |
| stats.addValues(entry); |
| reader.finishLine(); |
| } |
| } catch (NullPointerException|NumberFormatException e) { |
| throw new ProtocolException("problem parsing stats", e); |
| } finally { |
| IoUtils.closeQuietly(reader); |
| StrictMode.setThreadPolicy(savedPolicy); |
| } |
| return stats; |
| } |
| |
| /** |
| * Parse and return interface-level summary {@link NetworkStats}. Designed |
| * to return only IP layer traffic. Values monotonically increase since |
| * device boot, and may include details about inactive interfaces. |
| * |
| * @throws IllegalStateException when problem parsing stats. |
| */ |
| public NetworkStats readNetworkStatsSummaryXt() throws IOException { |
| final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); |
| |
| // return null when kernel doesn't support |
| if (!mStatsXtIfaceFmt.exists()) return null; |
| |
| final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6); |
| final NetworkStats.Entry entry = new NetworkStats.Entry(); |
| |
| ProcFileReader reader = null; |
| try { |
| // open and consume header line |
| reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceFmt)); |
| reader.finishLine(); |
| |
| while (reader.hasMoreData()) { |
| entry.iface = reader.nextString(); |
| entry.uid = UID_ALL; |
| entry.set = SET_ALL; |
| entry.tag = TAG_NONE; |
| |
| entry.rxBytes = reader.nextLong(); |
| entry.rxPackets = reader.nextLong(); |
| entry.txBytes = reader.nextLong(); |
| entry.txPackets = reader.nextLong(); |
| |
| stats.addValues(entry); |
| reader.finishLine(); |
| } |
| } catch (NullPointerException|NumberFormatException e) { |
| throw new ProtocolException("problem parsing stats", e); |
| } finally { |
| IoUtils.closeQuietly(reader); |
| StrictMode.setThreadPolicy(savedPolicy); |
| } |
| return stats; |
| } |
| |
| public NetworkStats readNetworkStatsDetail() throws IOException { |
| return readNetworkStatsDetail(UID_ALL, null, TAG_ALL, null); |
| } |
| |
| public NetworkStats readNetworkStatsDetail(int limitUid, String[] limitIfaces, int limitTag, |
| NetworkStats lastStats) throws IOException { |
| final NetworkStats stats = |
| readNetworkStatsDetailInternal(limitUid, limitIfaces, limitTag, lastStats); |
| final ArrayMap<String, String> stackedIfaces; |
| synchronized (sStackedIfaces) { |
| stackedIfaces = new ArrayMap<>(sStackedIfaces); |
| } |
| // Total 464xlat traffic to subtract from uid 0 on all base interfaces. |
| final NetworkStats adjustments = new NetworkStats(0, stackedIfaces.size()); |
| |
| NetworkStats.Entry entry = null; // For recycling |
| |
| // For 464xlat traffic, xt_qtaguid sees every IPv4 packet twice, once as a native IPv4 |
| // packet on the stacked interface, and once as translated to an IPv6 packet on the |
| // base interface. For correct stats accounting on the base interface, every 464xlat |
| // packet needs to be subtracted from the root UID on the base interface both for tx |
| // and rx traffic (http://b/12249687, http:/b/33681750). |
| for (int i = 0; i < stats.size(); i++) { |
| entry = stats.getValues(i, entry); |
| if (entry.iface == null || !entry.iface.startsWith(CLATD_INTERFACE_PREFIX)) { |
| continue; |
| } |
| final String baseIface = stackedIfaces.get(entry.iface); |
| if (baseIface == null) { |
| continue; |
| } |
| |
| NetworkStats.Entry adjust = |
| new NetworkStats.Entry(baseIface, 0, 0, 0, 0L, 0L, 0L, 0L, 0L); |
| // Subtract any 464lat traffic seen for the root UID on the current base interface. |
| adjust.rxBytes -= (entry.rxBytes + entry.rxPackets * IPV4V6_HEADER_DELTA); |
| adjust.txBytes -= (entry.txBytes + entry.txPackets * IPV4V6_HEADER_DELTA); |
| adjust.rxPackets -= entry.rxPackets; |
| adjust.txPackets -= entry.txPackets; |
| adjustments.combineValues(adjust); |
| |
| // For 464xlat traffic, xt_qtaguid only counts the bytes of the native IPv4 packet sent |
| // on the stacked interface with prefix "v4-" and drops the IPv6 header size after |
| // unwrapping. To account correctly for on-the-wire traffic, add the 20 additional bytes |
| // difference for all packets (http://b/12249687, http:/b/33681750). |
| entry.rxBytes = entry.rxPackets * IPV4V6_HEADER_DELTA; |
| entry.txBytes = entry.txPackets * IPV4V6_HEADER_DELTA; |
| entry.rxPackets = 0; |
| entry.txPackets = 0; |
| stats.combineValues(entry); |
| } |
| |
| stats.combineAllValues(adjustments); |
| |
| return stats; |
| } |
| |
| private NetworkStats readNetworkStatsDetailInternal(int limitUid, String[] limitIfaces, |
| int limitTag, NetworkStats lastStats) throws IOException { |
| if (USE_NATIVE_PARSING) { |
| final NetworkStats stats; |
| if (lastStats != null) { |
| stats = lastStats; |
| stats.setElapsedRealtime(SystemClock.elapsedRealtime()); |
| } else { |
| stats = new NetworkStats(SystemClock.elapsedRealtime(), -1); |
| } |
| if (nativeReadNetworkStatsDetail(stats, mStatsXtUid.getAbsolutePath(), limitUid, |
| limitIfaces, limitTag) != 0) { |
| throw new IOException("Failed to parse network stats"); |
| } |
| if (SANITY_CHECK_NATIVE) { |
| final NetworkStats javaStats = javaReadNetworkStatsDetail(mStatsXtUid, limitUid, |
| limitIfaces, limitTag); |
| assertEquals(javaStats, stats); |
| } |
| return stats; |
| } else { |
| return javaReadNetworkStatsDetail(mStatsXtUid, limitUid, limitIfaces, limitTag); |
| } |
| } |
| |
| /** |
| * Parse and return {@link NetworkStats} with UID-level details. Values are |
| * expected to monotonically increase since device boot. |
| */ |
| @VisibleForTesting |
| public static NetworkStats javaReadNetworkStatsDetail(File detailPath, int limitUid, |
| String[] limitIfaces, int limitTag) |
| throws IOException { |
| final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); |
| |
| final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 24); |
| final NetworkStats.Entry entry = new NetworkStats.Entry(); |
| |
| int idx = 1; |
| int lastIdx = 1; |
| |
| ProcFileReader reader = null; |
| try { |
| // open and consume header line |
| reader = new ProcFileReader(new FileInputStream(detailPath)); |
| reader.finishLine(); |
| |
| while (reader.hasMoreData()) { |
| idx = reader.nextInt(); |
| if (idx != lastIdx + 1) { |
| throw new ProtocolException( |
| "inconsistent idx=" + idx + " after lastIdx=" + lastIdx); |
| } |
| lastIdx = idx; |
| |
| entry.iface = reader.nextString(); |
| entry.tag = kernelToTag(reader.nextString()); |
| entry.uid = reader.nextInt(); |
| entry.set = reader.nextInt(); |
| entry.rxBytes = reader.nextLong(); |
| entry.rxPackets = reader.nextLong(); |
| entry.txBytes = reader.nextLong(); |
| entry.txPackets = reader.nextLong(); |
| |
| if ((limitIfaces == null || ArrayUtils.contains(limitIfaces, entry.iface)) |
| && (limitUid == UID_ALL || limitUid == entry.uid) |
| && (limitTag == TAG_ALL || limitTag == entry.tag)) { |
| stats.addValues(entry); |
| } |
| |
| reader.finishLine(); |
| } |
| } catch (NullPointerException|NumberFormatException e) { |
| throw new ProtocolException("problem parsing idx " + idx, e); |
| } finally { |
| IoUtils.closeQuietly(reader); |
| StrictMode.setThreadPolicy(savedPolicy); |
| } |
| |
| return stats; |
| } |
| |
| public void assertEquals(NetworkStats expected, NetworkStats actual) { |
| if (expected.size() != actual.size()) { |
| throw new AssertionError( |
| "Expected size " + expected.size() + ", actual size " + actual.size()); |
| } |
| |
| NetworkStats.Entry expectedRow = null; |
| NetworkStats.Entry actualRow = null; |
| for (int i = 0; i < expected.size(); i++) { |
| expectedRow = expected.getValues(i, expectedRow); |
| actualRow = actual.getValues(i, actualRow); |
| if (!expectedRow.equals(actualRow)) { |
| throw new AssertionError( |
| "Expected row " + i + ": " + expectedRow + ", actual row " + actualRow); |
| } |
| } |
| } |
| |
| /** |
| * Parse statistics from file into given {@link NetworkStats} object. Values |
| * are expected to monotonically increase since device boot. |
| */ |
| @VisibleForTesting |
| public static native int nativeReadNetworkStatsDetail( |
| NetworkStats stats, String path, int limitUid, String[] limitIfaces, int limitTag); |
| } |