| /* |
| * 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.server; |
| |
| import android.net.NetworkStats; |
| import android.os.SystemProperties; |
| import android.util.Log; |
| import android.util.Slog; |
| |
| import dalvik.system.SocketTagger; |
| import libcore.io.IoUtils; |
| |
| import java.io.FileDescriptor; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.math.BigInteger; |
| import java.net.SocketException; |
| import java.nio.charset.Charsets; |
| |
| /** |
| * Assigns tags to sockets for traffic stats. |
| */ |
| public final class NetworkManagementSocketTagger extends SocketTagger { |
| private static final String TAG = "NetworkManagementSocketTagger"; |
| private static final boolean LOGD = false; |
| |
| /** |
| * {@link SystemProperties} key that indicates if {@code qtaguid} bandwidth |
| * controls have been enabled. |
| */ |
| // TODO: remove when always enabled, or once socket tagging silently fails. |
| public static final String PROP_QTAGUID_ENABLED = "net.qtaguid_enabled"; |
| |
| private static ThreadLocal<SocketTags> threadSocketTags = new ThreadLocal<SocketTags>() { |
| @Override |
| protected SocketTags initialValue() { |
| return new SocketTags(); |
| } |
| }; |
| |
| public static void install() { |
| SocketTagger.set(new NetworkManagementSocketTagger()); |
| } |
| |
| public static void setThreadSocketStatsTag(int tag) { |
| threadSocketTags.get().statsTag = tag; |
| } |
| |
| public static int getThreadSocketStatsTag() { |
| return threadSocketTags.get().statsTag; |
| } |
| |
| public static void setThreadSocketStatsUid(int uid) { |
| threadSocketTags.get().statsUid = uid; |
| } |
| |
| @Override |
| public void tag(FileDescriptor fd) throws SocketException { |
| final SocketTags options = threadSocketTags.get(); |
| if (LOGD) { |
| Log.d(TAG, "tagSocket(" + fd.getInt$() + ") with statsTag=0x" |
| + Integer.toHexString(options.statsTag) + ", statsUid=" + options.statsUid); |
| } |
| try { |
| // TODO: skip tagging when options would be no-op |
| tagSocketFd(fd, options.statsTag, options.statsUid); |
| } catch (IOException e) { |
| throw new SocketException("Problem tagging socket", e); |
| } |
| } |
| |
| private void tagSocketFd(FileDescriptor fd, int tag, int uid) throws IOException { |
| final int fdNum = fd.getInt$(); |
| if (fdNum == -1 || (tag == -1 && uid == -1)) return; |
| |
| String cmd = "t " + fdNum; |
| if (tag == -1) { |
| // Case where just the uid needs adjusting. But probably the caller |
| // will want to track his own name here, just in case. |
| cmd += " 0"; |
| } else { |
| cmd += " " + tagToKernel(tag); |
| } |
| if (uid != -1) { |
| cmd += " " + uid; |
| } |
| internalModuleCtrl(cmd); |
| } |
| |
| @Override |
| public void untag(FileDescriptor fd) throws SocketException { |
| if (LOGD) { |
| Log.i(TAG, "untagSocket(" + fd.getInt$() + ")"); |
| } |
| try { |
| unTagSocketFd(fd); |
| } catch (IOException e) { |
| throw new SocketException("Problem untagging socket", e); |
| } |
| } |
| |
| private void unTagSocketFd(FileDescriptor fd) throws IOException { |
| int fdNum = fd.getInt$(); |
| final SocketTags options = threadSocketTags.get(); |
| if (fdNum == -1 || (options.statsTag == -1 && options.statsUid == -1)) return; |
| String cmd = "u " + fdNum; |
| internalModuleCtrl(cmd); |
| } |
| |
| public static class SocketTags { |
| public int statsTag = -1; |
| public int statsUid = -1; |
| } |
| |
| public static void setKernelCounterSet(int uid, int counterSet) { |
| final StringBuilder command = new StringBuilder(); |
| command.append("s ").append(counterSet).append(" ").append(uid); |
| try { |
| internalModuleCtrl(command.toString()); |
| } catch (IOException e) { |
| Slog.w(TAG, "problem changing counter set for uid " + uid + " : " + e); |
| } |
| } |
| |
| public static void resetKernelUidStats(int uid) { |
| final StringBuilder command = new StringBuilder(); |
| command.append("d 0 ").append(uid); |
| try { |
| internalModuleCtrl(command.toString()); |
| } catch (IOException e) { |
| Slog.w(TAG, "problem clearing counters for uid " + uid + " : " + e); |
| } |
| } |
| |
| /** |
| * Sends commands to the kernel netfilter module. |
| * |
| * @param cmd command string for the qtaguid netfilter module. May not be null. |
| * <p>Supports: |
| * <ul><li>tag a socket:<br> |
| * <code>t <i>sock_fd</i> <i>acct_tag</i> [<i>uid_in_case_caller_is_acting_on_behalf_of</i>]</code><br> |
| * <code>*_tag</code> defaults to default_policy_tag_from_uid(uid_of_caller)<br> |
| * <code>acct_tag</code> is either 0 or greater that 2^32.<br> |
| * <code>uid_*</code> is only settable by privileged UIDs (DownloadManager,...) |
| * </li> |
| * <li>untag a socket, preserving counters:<br> |
| * <code>u <i>sock_fd</i></code> |
| * </li></ul> |
| * <p>Notes:<br> |
| * <ul><li><i>sock_fd</i> is withing the callers process space.</li> |
| * <li><i>*_tag</i> are 64bit values</li></ul> |
| * |
| */ |
| private static void internalModuleCtrl(String cmd) throws IOException { |
| if (!SystemProperties.getBoolean(PROP_QTAGUID_ENABLED, false)) return; |
| |
| // TODO: migrate to native library for tagging commands |
| FileOutputStream procOut = null; |
| try { |
| procOut = new FileOutputStream("/proc/net/xt_qtaguid/ctrl"); |
| procOut.write(cmd.getBytes(Charsets.US_ASCII)); |
| } finally { |
| IoUtils.closeQuietly(procOut); |
| } |
| } |
| |
| /** |
| * Convert {@link Integer} tag to {@code /proc/} format. Assumes unsigned |
| * base-10 format like {@code 2147483647}. Currently strips signed bit to |
| * avoid using {@link BigInteger}. |
| */ |
| public static String tagToKernel(int tag) { |
| // TODO: eventually write in hex, since that's what proc exports |
| // TODO: migrate to direct integer instead of odd shifting |
| return Long.toString((((long) tag) << 32) & 0x7FFFFFFF00000000L); |
| } |
| |
| /** |
| * Convert {@code /proc/} tag format to {@link Integer}. Assumes incoming |
| * format like {@code 0x7fffffff00000000}. |
| */ |
| public static int kernelToTag(String string) { |
| // TODO: migrate to direct integer instead of odd shifting |
| return (int) (Long.decode(string) >> 32); |
| } |
| } |