Android 11 Wifi之ConnectivityService流程

一、NetworkFactory注册
frameworks/base/services/java/com/android/server/SystemServer.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiService.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiNetworkFactory.java
frameworks/libs/net/common/src_servicescommon/android/net/NetworkFactory.java
frameworks/base/core/java/android/net/ConnectivityManager.java
frameworks/base/services/core/java/com/android/server/ConnectivityService.java

*[SystemServer.java]
├──startOtherServices(@NonNull TimingsTraceAndSlog t)
   └──if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI))
         // Wifi Service must be started first for wifi-related services.
         t.traceBegin("StartWifi");
         mSystemServiceManager.startServiceFromJar(WIFI_SERVICE_CLASS, WIFI_APEX_SERVICE_JAR_PATH);//启动WifiService
         t.traceEnd();
         t.traceBegin("StartWifiScanning");
         mSystemServiceManager.startServiceFromJar(WIFI_SCANNING_SERVICE_CLASS, WIFI_APEX_SERVICE_JAR_PATH);//启动WifiScanningService
         t.traceEnd();
   |
   *[WifiService.java]
   ├──onBootPhase(int phase)
      └──if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY)
            createNotificationChannels(mWifiContext);
            mImpl.checkAndStartWifi();
      └──else if (phase == SystemService.PHASE_BOOT_COMPLETED)
            mImpl.handleBootCompleted();
            |
            *[WifiServiceImpl.java]
            ├──handleBootCompleted()
               └──mWifiThreadRunner.post(() -> {
                      mClientModeImpl.handleBootCompleted();})
                      |
                      *[ClientModeImpl.java]
                      *
                      // Make the network factories.
                      mNetworkFactory = mWifiInjector.makeWifiNetworkFactory(mNetworkCapabilitiesFilter, mWifiConnectivityManager);//创建WifiNetworkFactory对象
                      // CHECKSTYLE:OFF IndentationCheck
                      addState(mDefaultState);
                      addState(mConnectModeState, mDefaultState);
                      addState(mL2ConnectedState, mConnectModeState);
                      addState(mObtainingIpState, mL2ConnectedState);
                      addState(mConnectedState, mL2ConnectedState);
                      addState(mRoamingState, mL2ConnectedState);
                      addState(mDisconnectingState, mConnectModeState);
                      addState(mDisconnectedState, mConnectModeState);
                      // CHECKSTYLE:ON IndentationCheck
                      setInitialState(mDefaultState);
                      *
                      ├──handleBootCompleted()
                         └──sendMessage(CMD_BOOT_COMPLETED);
                      ├──DefaultState.processMessage(Message message)
                         └──case CMD_BOOT_COMPLETED:
                            └──registerNetworkFactory()
                      ├──registerNetworkFactory()
                         └──mNetworkFactory.register()//注册WifiNetworkFactory
                            *[WifiNetworkFactory.java]-->[NetworkFactory.java]//走父类的register方法
                            ├──register()
                               └──mProvider = new NetworkProvider(mContext, NetworkFactoryImpl.this.getLooper(), logTag) {
                                           @Override
                                           public void onNetworkRequested(@NonNull NetworkRequest request, int score,int servingProviderId) {
                                              handleAddRequest(request);
                                           }
                                           @Override
                                           public void onNetworkRequestWithdrawn(@NonNull NetworkRequest request) {
                                              handleRemoveRequest(request);
                                           }
                                        };
                               └──((ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE)).registerNetworkProvider(mProvider);//向ConnectivityManager注册NetworkProvider
                                        |
                                        *[ConnectivityManager.java]
                                        ├──registerNetworkProvider(@NonNull NetworkProvider provider)
                                           └──int providerId = mService.registerNetworkProvider(provider.getMessenger(),provider.getName());
                                              provider.setProviderId(providerId);
                                              |
                                              *[ConnectivityService.java]
                                              ├──registerNetworkProvider(Messenger messenger, String name)
                                                 └──NetworkProviderInfo npi = new NetworkProviderInfo(name, messenger,null /* asyncChannel */, nextNetworkProviderId(),
                                                    () -> unregisterNetworkProvider(messenger));
                                                 └──mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_PROVIDER, npi));//发送EVENT_REGISTER_NETWORK_PROVIDER消息
                                              ├──InternalHandler.handleMessage(Message msg)
                                                 └──case EVENT_REGISTER_NETWORK_PROVIDER:
                                                    └──handleRegisterNetworkProvider((NetworkProviderInfo) msg.obj);
                                              ├──handleRegisterNetworkProvider(NetworkProviderInfo npi)
                                                 └──mNetworkProviderInfos.put(npi.messenger, npi);
                                                 └──npi.connect(mContext, mTrackerHandler);
                                                    ├──NetworkProviderInfo.connect(Context context, Handler handler)
                                                       └──if (isLegacyNetworkFactory())//条件为false
                                                              mAsyncChannel.connect(context, handler, messenger);
                                                       └──else
                                                              messenger.getBinder().linkToDeath(mDeathRecipient, 0);//注册完成

二、NetworkAgent注册
frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
frameworks/base/core/java/android/net/NetworkAgent.java
frameworks/base/core/java/android/net/ConnectivityManager.java
frameworks/base/services/core/java/com/android/server/ConnectivityService.java

*[ClientModeImpl.java]
├──L2ConnectedState.enter()
   └──mNetworkAgent = new WifiNetworkAgent(mContext, getHandler().getLooper(),"WifiNetworkAgent", nc, mLinkProperties, 60, naConfig,mNetworkFactory.getProvider());
      ├──ClientModeImpl&WifiNetworkAgent -->NetworkAgent.java
         |
         *[NetworkAgent.java]
         ├──register()
            └──mNetwork = cm.registerNetworkAgent(new Messenger(mHandler),//向ConnectivityManager注册NetworkAgent
                    new NetworkInfo(mInitialConfiguration.info),
                    mInitialConfiguration.properties, mInitialConfiguration.capabilities,
                    mInitialConfiguration.score, mInitialConfiguration.config, providerId);
               |
               *[ConnectivityManager.java]
               ├──registerNetworkAgent(Messenger messenger, NetworkInfo ni, LinkProperties lp,NetworkCapabilities nc, int score, NetworkAgentConfig config)
                  └──return registerNetworkAgent(messenger, ni, lp, nc, score, config, NetworkProvider.ID_NONE)
               ├──registerNetworkAgent(Messenger messenger, NetworkInfo ni, LinkProperties lp,NetworkCapabilities nc, int score, NetworkAgentConfig config, int providerId)
                  └──return mService.registerNetworkAgent(messenger, ni, lp, nc, score, config, providerId)
                  |
                  *[ConnectivityService.java]
                  ├──registerNetworkAgent(Messenger messenger, NetworkInfo networkInfo,LinkProperties linkProperties, NetworkCapabilities networkCapabilities,
                     int currentScore, NetworkAgentConfig networkAgentConfig, int providerId)
                     └──mDeps.getNetworkStack().makeNetworkMonitor(nai.network, name, new NetworkMonitorCallbacks(nai))
                  ├──ConnectivityService&NetworkMonitorCallbacks
                     └──onNetworkMonitorCreated(INetworkMonitor networkMonitor)
                        └──mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_AGENT,new Pair<>(mNai.getAndDestroy(), networkMonitor)))
                  ├──ConnectivityService&InternalHandler
                     ├──handleMessage(Message msg)
                        └──handleRegisterNetworkAgent(arg.first, arg.second)
                  ├──handleRegisterNetworkAgent(NetworkAgentInfo nai, INetworkMonitor networkMonitor)
                     └──nai.onNetworkMonitorCreated(networkMonitor)
                     └──networkMonitor.start()//启动NetworkMonitor
                     └──nai.asyncChannel.connect(mContext, mTrackerHandler, nai.messenger)//通过AsyncChannel跨进程建立连接
   └──mWifiScoreReport.setNetworkAgent(mNetworkAgent);

三、WiFi网络请求
frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
frameworks/base/core/java/android/net/NetworkAgent.java
frameworks/base/services/core/java/com/android/server/ConnectivityService.java
frameworks/base/core/java/android/net/NetworkProvider.java
frameworks/libs/net/common/src_servicescommon/android/net/NetworkFactory.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiNetworkFactory.java

frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
frameworks/base/core/java/android/net/NetworkAgent.java
frameworks/base/services/core/java/com/android/server/ConnectivityService.java
frameworks/base/core/java/android/net/NetworkProvider.java
frameworks/libs/net/common/src_servicescommon/android/net/NetworkFactory.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiNetworkFactory.java

*[ClientModeImpl.java]
├──ClientModeImpl&ConnectModeState
   ├──enter()
      └──setupClientMode()
         └──updateDataInterface()
            └──mIpClientCallbacks = new IpClientCallbacksImpl()
├──ClientModeImpl&IpClientCallbacksImpl
   ├──onProvisioningSuccess(LinkProperties newLp)
      └──sendMessage(CMD_UPDATE_LINKPROPERTIES, newLp);
      └──sendMessage(CMD_IP_CONFIGURATION_SUCCESSFUL);
├──ClientModeImpl&L2ConnectedState
   ├──processMessage(Message message)
      └──case CMD_IP_CONFIGURATION_SUCCESSFUL:
         └──sendConnectedState()
├──sendConnectedState()
   └──mNetworkAgent.markConnected();
      |
      *[NetworkAgent.java]
      ├──markConnected()
         └──queueOrSendMessage(EVENT_NETWORK_INFO_CHANGED, mNetworkInfo);
      ├──queueOrSendMessage(int what, Object obj)
         └──queueOrSendMessage(what, 0, 0, obj);
      ├──queueOrSendMessage(int what, int arg1, int arg2)
         └──queueOrSendMessage(what, arg1, arg2, null);
      ├──queueOrSendMessage(int what, int arg1, int arg2, Object obj)
         └──queueOrSendMessage(msg);
      ├──queueOrSendMessage(Message msg)
         └──mAsyncChannel.sendMessage(msg);//通过AsyncChannel跨进程与ConnectivityService通信
            |
            *[ConnectivityService.java]
            ├──maybeHandleNetworkAgentMessage(Message msg)
               └──case NetworkAgent.EVENT_NETWORK_INFO_CHANGED:
                  └──updateNetworkInfo(nai, info);
            ├──updateNetworkInfo(NetworkAgentInfo networkAgent, NetworkInfo info)
               └──rematchAllNetworksAndRequests();
            ├──rematchAllNetworksAndRequests()
               └──applyNetworkReassignment(changes, now);
            ├──applyNetworkReassignment(@NonNull final NetworkReassignment changes,final long now)
               └──sendUpdatedScoreToFactories(event.mRequest.request, event.mNewNetwork);
            ├──sendUpdatedScoreToFactories(@NonNull NetworkRequest networkRequest,@Nullable NetworkAgentInfo nai)
               └──npi.requestNetwork(networkRequest, score, serial);
            ├──ConnectivityService&NetworkProviderInfo
               ├──requestNetwork(NetworkRequest request, int score, int servingProviderId)
                  └──if (isLegacyNetworkFactory())//条件为true
                         mAsyncChannel.sendMessage(android.net.NetworkFactory.CMD_REQUEST_NETWORK, score,servingProviderId, request);
                         |
                         *[NetworkProvider.java]
                         ├──NetworkProvider(@NonNull Context context, @NonNull Looper looper, @NonNull String name)//构造方法
                            └──handler.handleMessage(Message m)
                               └──case CMD_REQUEST_NETWORK:
                                  └──onNetworkRequested((NetworkRequest) m.obj, m.arg1, m.arg2);
                                     |
                                     *[NetworkFactory.java]
                                     ├──register()//转到NetworkFactory注册中，创建了NetworkProvider对象
                                        └──mProvider = new NetworkProvider(mContext, NetworkFactoryImpl.this.getLooper(), logTag) {
                                              @Override
                                              public void onNetworkRequested(@NonNull NetworkRequest request, int score,int servingProviderId) {
                                                  handleAddRequest(request);
                                     ├──handleAddRequest(@NonNull final NetworkRequest request)
                                        └──evalRequest(n);
                                     ├──evalRequest(NetworkRequestInfo n)
                                        └──if (shouldNeedNetworkFor(n))//用于判断保留当前的网络连接
                                               log("  needNetworkFor");
                                               needNetworkFor(n.request, n.score);
                                               |
                                               *[WifiNetworkFactory.java]
                                               ├──needNetworkFor(NetworkRequest networkRequest, int score)
                                                  └──retrieveWifiScanner();//周期性扫描
                                                  └──startPeriodicScans()
                                                     └──startScan();
                                        └──else if (shouldReleaseNetworkFor(n))//判断需要断开当前网络连接
                                               log("  releaseNetworkFor");
                                               releaseNetworkFor(n.request);
                                        └──else
                                               log("  done");
                                              }
                                              @Override
                                              public void onNetworkRequestWithdrawn(@NonNull NetworkRequest request) {
                                                  handleRemoveRequest(request);
                                              }
                                           };
                  └──else
                         sendMessageToNetworkProvider(NetworkProvider.CMD_REQUEST_NETWORK, score,servingProviderId, request);
   └──sendNetworkChangeBroadcast(DetailedState.CONNECTED);//发送已经连接成功的广播