Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.connectivity.tethering; |
| 18 | |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 19 | import static android.provider.Settings.Global.TETHER_OFFLOAD_DISABLED; |
| 20 | |
| 21 | import android.content.ContentResolver; |
Erik Kline | 3a5278f | 2017-06-24 19:29:10 +0900 | [diff] [blame] | 22 | import android.net.IpPrefix; |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 23 | import android.net.LinkProperties; |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 24 | import android.net.RouteInfo; |
Erik Kline | 7747fd4 | 2017-05-12 16:52:48 +0900 | [diff] [blame] | 25 | import android.net.util.SharedLog; |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 26 | import android.os.Handler; |
| 27 | import android.provider.Settings; |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 28 | |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 29 | import java.net.Inet4Address; |
| 30 | import java.net.InetAddress; |
| 31 | import java.util.ArrayList; |
Erik Kline | 3a5278f | 2017-06-24 19:29:10 +0900 | [diff] [blame] | 32 | import java.util.Set; |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 33 | |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 34 | /** |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 35 | * A class to encapsulate the business logic of programming the tethering |
| 36 | * hardware offload interface. |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 37 | * |
| 38 | * @hide |
| 39 | */ |
| 40 | public class OffloadController { |
| 41 | private static final String TAG = OffloadController.class.getSimpleName(); |
| 42 | |
| 43 | private final Handler mHandler; |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 44 | private final OffloadHardwareInterface mHwInterface; |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 45 | private final ContentResolver mContentResolver; |
Erik Kline | 7747fd4 | 2017-05-12 16:52:48 +0900 | [diff] [blame] | 46 | private final SharedLog mLog; |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 47 | private boolean mConfigInitialized; |
| 48 | private boolean mControlInitialized; |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 49 | private LinkProperties mUpstreamLinkProperties; |
Erik Kline | 3a5278f | 2017-06-24 19:29:10 +0900 | [diff] [blame] | 50 | private Set<IpPrefix> mExemptPrefixes; |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 51 | |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 52 | public OffloadController(Handler h, OffloadHardwareInterface hwi, |
| 53 | ContentResolver contentResolver, SharedLog log) { |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 54 | mHandler = h; |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 55 | mHwInterface = hwi; |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 56 | mContentResolver = contentResolver; |
Erik Kline | 7747fd4 | 2017-05-12 16:52:48 +0900 | [diff] [blame] | 57 | mLog = log.forSubComponent(TAG); |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | public void start() { |
Erik Kline | 6a64c15 | 2017-07-06 12:38:48 +0900 | [diff] [blame^] | 61 | if (started()) return; |
| 62 | |
| 63 | if (isOffloadDisabled()) { |
| 64 | mLog.i("tethering offload disabled"); |
| 65 | return; |
| 66 | } |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 67 | |
| 68 | if (!mConfigInitialized) { |
| 69 | mConfigInitialized = mHwInterface.initOffloadConfig(); |
| 70 | if (!mConfigInitialized) { |
Erik Kline | 7747fd4 | 2017-05-12 16:52:48 +0900 | [diff] [blame] | 71 | mLog.i("tethering offload config not supported"); |
Erik Kline | f4b6e34 | 2017-04-25 19:19:59 +0900 | [diff] [blame] | 72 | stop(); |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 73 | return; |
| 74 | } |
| 75 | } |
| 76 | |
Erik Kline | f4b6e34 | 2017-04-25 19:19:59 +0900 | [diff] [blame] | 77 | mControlInitialized = mHwInterface.initOffloadControl( |
| 78 | new OffloadHardwareInterface.ControlCallback() { |
| 79 | @Override |
| 80 | public void onOffloadEvent(int event) { |
| 81 | mLog.log("got offload event: " + event); |
| 82 | } |
| 83 | |
| 84 | @Override |
| 85 | public void onNatTimeoutUpdate(int proto, |
| 86 | String srcAddr, int srcPort, |
| 87 | String dstAddr, int dstPort) { |
| 88 | mLog.log(String.format("NAT timeout update: %s (%s,%s) -> (%s,%s)", |
| 89 | proto, srcAddr, srcPort, dstAddr, dstPort)); |
| 90 | } |
| 91 | }); |
| 92 | if (!mControlInitialized) { |
| 93 | mLog.i("tethering offload control not supported"); |
| 94 | stop(); |
| 95 | } |
Erik Kline | 7fd696c | 2017-06-12 18:20:08 +0900 | [diff] [blame] | 96 | mLog.log("tethering offload started"); |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | public void stop() { |
Erik Kline | 7fd696c | 2017-06-12 18:20:08 +0900 | [diff] [blame] | 100 | final boolean wasStarted = started(); |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 101 | mUpstreamLinkProperties = null; |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 102 | mHwInterface.stopOffloadControl(); |
| 103 | mControlInitialized = false; |
| 104 | mConfigInitialized = false; |
Erik Kline | 7fd696c | 2017-06-12 18:20:08 +0900 | [diff] [blame] | 105 | if (wasStarted) mLog.log("tethering offload stopped"); |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | public void setUpstreamLinkProperties(LinkProperties lp) { |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 109 | if (!started()) return; |
| 110 | |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 111 | mUpstreamLinkProperties = (lp != null) ? new LinkProperties(lp) : null; |
| 112 | // TODO: examine return code and decide what to do if programming |
| 113 | // upstream parameters fails (probably just wait for a subsequent |
| 114 | // onOffloadEvent() callback to tell us offload is available again and |
| 115 | // then reapply all state). |
| 116 | pushUpstreamParameters(); |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 117 | } |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 118 | |
Erik Kline | 3a5278f | 2017-06-24 19:29:10 +0900 | [diff] [blame] | 119 | public void updateExemptPrefixes(Set<IpPrefix> exemptPrefixes) { |
| 120 | if (!started()) return; |
| 121 | |
| 122 | mExemptPrefixes = exemptPrefixes; |
| 123 | // TODO: |
| 124 | // - add IP addresses from all downstream link properties |
| 125 | // - add routes from all non-tethering downstream link properties |
| 126 | // - remove any 64share prefixes |
| 127 | // - push this to the HAL |
| 128 | } |
| 129 | |
Erik Kline | 6e9a101 | 2017-06-06 19:24:21 +0900 | [diff] [blame] | 130 | public void notifyDownstreamLinkProperties(LinkProperties lp) { |
| 131 | if (!started()) return; |
| 132 | |
| 133 | // TODO: Cache LinkProperties on a per-ifname basis and compute the |
| 134 | // deltas, calling addDownstream()/removeDownstream() accordingly. |
| 135 | } |
| 136 | |
| 137 | public void removeDownstreamInterface(String ifname) { |
| 138 | if (!started()) return; |
| 139 | |
| 140 | // TODO: Check cache for LinkProperties of ifname and, if present, |
| 141 | // call removeDownstream() accordingly. |
| 142 | } |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 143 | |
Erik Kline | 92c4db0 | 2017-05-31 10:21:32 +0900 | [diff] [blame] | 144 | private boolean isOffloadDisabled() { |
| 145 | // Defaults to |false| if not present. |
| 146 | return (Settings.Global.getInt(mContentResolver, TETHER_OFFLOAD_DISABLED, 0) != 0); |
| 147 | } |
| 148 | |
Erik Kline | 5a7c8a0 | 2017-04-30 19:36:15 +0900 | [diff] [blame] | 149 | private boolean started() { |
| 150 | return mConfigInitialized && mControlInitialized; |
| 151 | } |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 152 | |
| 153 | private boolean pushUpstreamParameters() { |
| 154 | if (mUpstreamLinkProperties == null) { |
| 155 | return mHwInterface.setUpstreamParameters(null, null, null, null); |
| 156 | } |
| 157 | |
| 158 | // A stacked interface cannot be an upstream for hardware offload. |
| 159 | // Consequently, we examine only the primary interface name, look at |
| 160 | // getAddresses() rather than getAllAddresses(), and check getRoutes() |
| 161 | // rather than getAllRoutes(). |
| 162 | final String iface = mUpstreamLinkProperties.getInterfaceName(); |
| 163 | final ArrayList<String> v6gateways = new ArrayList<>(); |
| 164 | String v4addr = null; |
| 165 | String v4gateway = null; |
| 166 | |
| 167 | for (InetAddress ip : mUpstreamLinkProperties.getAddresses()) { |
| 168 | if (ip instanceof Inet4Address) { |
| 169 | v4addr = ip.getHostAddress(); |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | // Find the gateway addresses of all default routes of either address family. |
| 175 | for (RouteInfo ri : mUpstreamLinkProperties.getRoutes()) { |
| 176 | if (!ri.hasGateway()) continue; |
| 177 | |
| 178 | final String gateway = ri.getGateway().getHostAddress(); |
| 179 | if (ri.isIPv4Default()) { |
| 180 | v4gateway = gateway; |
| 181 | } else if (ri.isIPv6Default()) { |
| 182 | v6gateways.add(gateway); |
| 183 | } |
| 184 | } |
| 185 | |
Erik Kline | 1185459 | 2017-06-15 18:06:34 +0900 | [diff] [blame] | 186 | return mHwInterface.setUpstreamParameters( |
| 187 | iface, v4addr, v4gateway, (v6gateways.isEmpty() ? null : v6gateways)); |
Erik Kline | 7990aef | 2017-06-01 20:11:25 +0900 | [diff] [blame] | 188 | } |
Erik Kline | e0cce21 | 2017-03-06 14:05:23 +0900 | [diff] [blame] | 189 | } |