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WifiServicet.traceEnd();t.traceBegin("StartWifiScanning");mSystemServiceManager.startServiceFromJar(WIFI_SCANNING_SERVICE_CLASS, WIFI_APEX_SERVICE_JAR_PATH);//启动WifiScanningServicet.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 IndentationCheckaddState(mDefaultState);addState(mConnectModeState, mDefaultState);addState(mL2ConnectedState, mConnectModeState);addState(mObtainingIpState, mL2ConnectedState);addState(mConnectedState, mL2ConnectedState);addState(mRoamingState, mL2ConnectedState);addState(mDisconnectingState, mConnectModeState);addState(mDisconnectedState, mConnectModeState);// CHECKSTYLE:ON IndentationChecksetInitialState(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) {@Overridepublic void onNetworkRequested(@NonNull NetworkRequest request, int score,int servingProviderId) {handleAddRequest(request);}@Overridepublic 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falsemAsyncChannel.connect(context, handler, messenger);└──elsemessenger.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NetworkAgentnew 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truemAsyncChannel.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) {@Overridepublic 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);└──elselog("  done");}@Overridepublic void onNetworkRequestWithdrawn(@NonNull NetworkRequest request) {handleRemoveRequest(request);}};└──elsesendMessageToNetworkProvider(NetworkProvider.CMD_REQUEST_NETWORK, score,servingProviderId, request);└──sendNetworkChangeBroadcast(DetailedState.CONNECTED);//发送已经连接成功的广播

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