android wifi framework创建softap(个人热点)

这是android 11高通车机系统的wifi热点日志流程

Line 87696: 05-30 17:04:43.457 10499 10499 V WifiManager: registerSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@3c702c3, executor=android.os.HandlerExecutor@465c740
   Line 92004: 05-30 17:04:46.216 10499 10499 V WifiManager: unregisterSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@3c702c3
   Line 93443: 05-30 17:04:47.399 1803 1881 E WifiManager: wqy- startTetheredHotspot
   Line 93444: 05-30 17:04:47.400 809 3327 E WifiService: wqy-startTetheredHotspot
   Line 93446: 05-30 17:04:47.401 809 3327 E WifiService: wqy-startSoftApInternal
   Line 93447: 05-30 17:04:47.401 809 3327 E WifiActiveModeWarden: wqy-startSoftAp, 237line
   Line 93447: 05-30 17:04:47.401 809 3327 E WifiActiveModeWarden: wqy-startSoftAp, 237line
   Line 93448: 05-30 17:04:47.401 809 1062 E WifiController: wqy-processMessageFiltered, CMD_SET_AP, 855line
   Line 93449: 05-30 17:04:47.401 809 1062 E WifiController: wqy-processMessageFiltered, CMD_SET_AP, msg.arg1 == 1 , 855line
   Line 93450: 05-30 17:04:47.402 809 1062 E WifiActiveModeWarden: wqy-startSoftApModeManager
   Line 93450: 05-30 17:04:47.402 809 1062 E WifiActiveModeWarden: wqy-startSoftApModeManager
   Line 93451: 05-30 17:04:47.402 809 1062 D WifiActiveModeWarden: Starting SoftApModeManager config = null
   Line 93455: 05-30 17:04:47.409 809 1062 D SoftApManager: wqy-SoftApManager: new SoftApManager
   Line 93455: 05-30 17:04:47.409 809 1062 D SoftApManager: wqy-SoftApManager: new SoftApManager
   Line 93455: 05-30 17:04:47.409 809 1062 D SoftApManager: wqy-SoftApManager: new SoftApManager
   Line 93455: 05-30 17:04:47.409 809 1062 D SoftApManager: wqy-SoftApManager: new SoftApManager
   Line 93456: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is null
   Line 93456: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is null
   Line 93456: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is null
   Line 93457: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is not null
   Line 93457: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is not null
   Line 93457: 05-30 17:04:47.410 809 1062 D SoftApManager: wqy-SoftApManager: softApConfig is not null
   Line 93458: 05-30 17:04:47.410 809 1062 E WifiApConfigStore: wqy-randomizeBssidIfUnset
   Line 93459: 05-30 17:04:47.410 809 1062 E WifiApConfigStore: wqy-randomizeBssidIfUnset, bssid is null, set randoem bssid
   Line 93486: 05-30 17:04:47.482 809 1062 E WifiApConfigStore: wqy-randomizeBssidIfUnset, bssid is not null
   Line 94639: 05-30 17:04:48.683 809 1062 D SoftApManager: band 1 iface wlan1 country US
   Line 94757: 05-30 17:04:48.871 809 1062 D SoftApManager: Soft AP is started
   Line 94758: 05-30 17:04:48.873 809 1062 D SoftApManager: SoftAp is ready for use
   Line 94768: 05-30 17:04:48.878 809 1062 D SoftApManager: Resetting connected clients on start
   Line 94774: 05-30 17:04:48.880 809 1062 D SoftApManager: Timeout message scheduled, delay = 600000
   Line 96312: 05-30 17:04:50.182 809 1062 D SoftApManager: Channel switched. Frequency: 2412 Bandwidth: 2
   Line 96377: 05-30 17:04:50.296 809 1062 D SoftApManager: start to init softAP vendor
   Line 96378: 05-30 17:04:50.296 809 1062 I SoftApManager: wlan.sample.vendor_init not set to 1, not set sample values
   Line 118101: 05-30 17:05:08.309 10499 10499 V WifiManager: registerSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@3c702c3, executor=android.os.HandlerExecutor@625c777
   Line 122649: 05-30 17:05:11.323 10499 10499 V WifiManager: unregisterSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@3c702c3
   Line 124433: 05-30 17:05:13.102 809 1721 E WifiService: wqy-setWifiEnabled2
   Line 124435: 05-30 17:05:13.104 809 1062 D WifiActiveModeWarden: Starting ClientModeManager
   Line 125164: 05-30 17:05:13.497 809 832 E WifiService: wqy-startScan
   Line 128320: 05-30 17:05:16.200 10499 10499 V WifiManager: registerSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@fd2bd8c, executor=android.os.HandlerExecutor@8c38cd5
   Line 131584: 05-30 17:05:19.063 10499 10499 V WifiManager: unregisterSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@fd2bd8c
   Line 137173: 05-30 17:05:25.267 809 1062 D SoftApManager: CMD_ASSOCIATED_STATIONS_CHANGED, Client: 02:7d:6f:f1:50:18 isConnected: true
   Line 137176: 05-30 17:05:25.267 809 1062 D SoftApManager: The connected wifi stations have changed with count: 1: [WifiClient{mMacAddress=02:7d:6f:f1:50:18}]
   Line 137180: 05-30 17:05:25.269 809 1062 D SoftApManager: Timeout message canceled
   Line 206289: 05-30 17:06:29.222 10499 10499 V WifiManager: registerSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@fd2bd8c, executor=android.os.HandlerExecutor@5dff756
   Line 209320: 05-30 17:06:31.406 809 3327 E WifiService: wqy-startScan
   Line 209968: 05-30 17:06:31.985 10499 10499 V WifiManager: unregisterSoftApCallback: callback=com.android.settings.wifi.tether.WifiTetherSoftApManager$1@fd2bd8c

1、一切调用都从framework的WifiManager开始，根据注释，这儿的softapconfig有可能是指定的softap，也有可能使用persisted softap

frameworks/base/wifi/java/android/net/wifi/WifiManager.java

    /*** Start Soft AP (hotspot) mode for tethering purposes with the specified configuration.* Note that starting Soft AP mode may disable station mode operation if the device does not* support concurrency.* @param softApConfig A valid SoftApConfiguration specifying the configuration of the SAP,*                     or null to use the persisted Soft AP configuration that was previously*                     set using {@link #setSoftApConfiguration(softApConfiguration)}.* @return {@code true} if the operation succeeded, {@code false} otherwise** @hide*/@SystemApi@RequiresPermission(anyOf = {android.Manifest.permission.NETWORK_STACK,NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK})public boolean startTetheredHotspot(@Nullable SoftApConfiguration softApConfig) {Log.e(TAG, "wqy- startTetheredHotspot");try {return mService.startTetheredHotspot(softApConfig);} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}

2、然后会调用到WifiService，实际调用都在WifiServiceImpl，会调用到startSoftApInternal

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java

    /*** see {@link android.net.wifi.WifiManager#startTetheredHotspot(SoftApConfiguration)}* @param softApConfig SSID, security and channel details as part of SoftApConfiguration* @return {@code true} if softap start was triggered* @throws SecurityException if the caller does not have permission to start softap*/@Overridepublic boolean startTetheredHotspot(@Nullable SoftApConfiguration softApConfig) {Log.e(TAG, "wqy-startTetheredHotspot");if (!startSoftApInternal(new SoftApModeConfiguration(WifiManager.IFACE_IP_MODE_TETHERED, softApConfig,mTetheredSoftApTracker.getSoftApCapability()))) {mTetheredSoftApTracker.setFailedWhileEnabling();return false;}return true;}

    /*** Internal method to start softap mode. Callers of this method should have already checked* proper permissions beyond the NetworkStack permission.*/private boolean startSoftApInternal(SoftApModeConfiguration apConfig) {int uid = Binder.getCallingUid();boolean privileged = isSettingsOrSuw(Binder.getCallingPid(), uid);mLog.trace("startSoftApInternal uid=% mode=%").c(uid).c(apConfig.getTargetMode()).flush();// null wifiConfig is a meaningful input for CMD_SET_AP; it means to use the persistent// AP config.SoftApConfiguration softApConfig = apConfig.getSoftApConfiguration();if (softApConfig != null&& (!WifiApConfigStore.validateApWifiConfiguration(softApConfig, privileged)|| !validateSoftApBand(softApConfig.getBand()))) {Log.e(TAG, "Invalid SoftApConfiguration");return false;}mActiveModeWarden.startSoftAp(apConfig);return true;}

这里有个WifiControll统一处理softap的状态，会在ActiveModeWarden.java里有个内部类的WifiControl，这儿是设置wifisoftap配置信息的

frameworks/opt/net/wifi/service/java/com/android/server/wifi/ActiveModeWarden.java

    /** Starts SoftAp. */public void startSoftAp(SoftApModeConfiguration softApConfig) {mWifiController.sendMessage(WifiController.CMD_SET_AP, 1, 0, softApConfig);}

                    case CMD_SET_AP:// note: CMD_SET_AP is handled/dropped in ECM mode - will not start hereif (msg.arg1 == 1) {startSoftApModeManager((SoftApModeConfiguration) msg.obj);} else {stopSoftApModeManagers(msg.arg2);}break;

这里会创建一个softapmanager，用于softap热点相关的操作

ActiveModeManager manager =
mWifiInjector.makeSoftApManager(listener, callback, softApConfig);

    /*** Method to enable soft ap for wifi hotspot.** The supplied SoftApModeConfiguration includes the target softap WifiConfiguration (or null if* the persisted config is to be used) and the target operating mode (ex,* {@link WifiManager#IFACE_IP_MODE_TETHERED} {@link WifiManager#IFACE_IP_MODE_LOCAL_ONLY}).** @param softApConfig SoftApModeConfiguration for the hostapd softap*/private void startSoftApModeManager(@NonNull SoftApModeConfiguration softApConfig) {Log.d(TAG, "Starting SoftApModeManager config = "+ softApConfig.getSoftApConfiguration());Preconditions.checkState(softApConfig.getTargetMode() == IFACE_IP_MODE_LOCAL_ONLY|| softApConfig.getTargetMode() == IFACE_IP_MODE_TETHERED);WifiManager.SoftApCallback callback =softApConfig.getTargetMode() == IFACE_IP_MODE_LOCAL_ONLY? mLohsCallback : mSoftApCallback;SoftApListener listener = new SoftApListener();ActiveModeManager manager =mWifiInjector.makeSoftApManager(listener, callback, softApConfig);listener.setActiveModeManager(manager);manager.start();manager.setRole(getRoleForSoftApIpMode(softApConfig.getTargetMode()));mActiveModeManagers.add(manager);}

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiInjector.java

    /*** Create a SoftApManager.* @param config SoftApModeConfiguration object holding the config and mode* @return an instance of SoftApManager*/public SoftApManager makeSoftApManager(@NonNull ActiveModeManager.Listener listener,@NonNull WifiManager.SoftApCallback callback,@NonNull SoftApModeConfiguration config) {return new SoftApManager(mContext, mWifiHandlerThread.getLooper(),mFrameworkFacade, mWifiNative, mCountryCode.getCountryCode(), listener, callback,mWifiApConfigStore, config, mWifiMetrics, mSarManager, mWifiDiagnostics);}

这里当softapconfig不为null，并且bssid为null的时候，会自己创建一个随机的mac

frameworks/opt/net/wifi/service/java/com/android/server/wifi/SoftApManager.java

SoftApManager() {if (softApConfig != null) {mIsRandomizeBssid = softApConfig.getBssid() == null;softApConfig = mWifiApConfigStore.randomizeBssidIfUnset(mContext, softApConfig);}}

这里会根据WIFI_UID获取签名证书相关的数据，并进行HMacSHA256的加密，也不能说加密，

然后用ssid值进行进行hash运算，经过一系列掩码运算，获取字节序里的6位16进制数作为mac地

址。

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiApConfigStore.java

    SoftApConfiguration randomizeBssidIfUnset(Context context, SoftApConfiguration config) {Log.e(TAG, " wqy--randomizeBssidIfUnset");SoftApConfiguration.Builder configBuilder = new SoftApConfiguration.Builder(config);if (config.getBssid() == null && context.getResources().getBoolean(R.bool.config_wifi_ap_mac_randomization_supported)) {Log.e(TAG, " wqy-randomizeBssidIfUnset, bssid is null, set randoem bssid");MacAddress macAddress = mMacAddressUtil.calculatePersistentMac(config.getSsid(),mMacAddressUtil.obtainMacRandHashFunctionForSap(Process.WIFI_UID));if (macAddress == null) {Log.e(TAG, "Failed to calculate MAC from SSID. "+ "Generating new random MAC instead.");macAddress = MacAddressUtils.createRandomUnicastAddress();}configBuilder.setBssid(macAddress);}Log.e(TAG, " wqy-randomizeBssidIfUnset, bssid is not null");return configBuilder.build();}

    /*** Computes the persistent randomized MAC using the given key and hash function.* @param key the key to compute MAC address for* @param hashFunction the hash function that will perform the MAC address computation.* @return The persistent randomized MAC address or null if inputs are invalid.*/public MacAddress calculatePersistentMac(String key, Mac hashFunction) {if (key == null || hashFunction == null) {return null;}Log.e(TAG, "wqy-calculatePersistentMac, key is " + key);byte[] hashedBytes;try {hashedBytes = hashFunction.doFinal(key.getBytes(StandardCharsets.UTF_8));Log.e(TAG, "wqy-calculatePersistentMac, hashedBytes is " + hashedBytes.toString());} catch (ProviderException | IllegalStateException e) {Log.e(TAG, "Failure in calculatePersistentMac", e);return null;}ByteBuffer bf = ByteBuffer.wrap(hashedBytes);Log.e(TAG, "wqy-calculatePersistentMac, bf = " + bf.toString());long longFromSsid = bf.getLong();/*** Masks the generated long so that it represents a valid randomized MAC address.* Specifically, this sets the locally assigned bit to 1, multicast bit to 0*/longFromSsid &= MAC_ADDRESS_VALID_LONG_MASK;longFromSsid |= MAC_ADDRESS_LOCALLY_ASSIGNED_MASK;longFromSsid &= ~MAC_ADDRESS_MULTICAST_MASK;bf.clear();bf.putLong(0, longFromSsid);Log.e(TAG, "wqy-calculatePersistentMac, longFromSsid " + Long.toHexString(longFromSsid));// MacAddress.fromBytes requires input of length 6, which is obtained from the// last 6 bytes from the generated long.MacAddress macAddress = MacAddress.fromBytes(Arrays.copyOfRange(bf.array(), 2, 8));return macAddress;}

    private Mac obtainMacRandHashFunctionInternal(int uid, String alias) {try {KeyStore keyStore = AndroidKeyStoreProvider.getKeyStoreForUid(uid);// tries to retrieve the secret, and generate a new one if it's unavailable.Key key = keyStore.getKey(alias, null);if (key == null) {key = generateAndPersistNewMacRandomizationSecret(uid, alias);}if (key == null) {Log.e(TAG, "Failed to generate secret for " + alias);return null;}Mac result = Mac.getInstance("HmacSHA256");result.init(key);return result;} catch (KeyStoreException | NoSuchAlgorithmException | InvalidKeyException| UnrecoverableKeyException | NoSuchProviderException e) {Log.e(TAG, "Failure in obtainMacRandHashFunction", e);return null;}}

接下来该往下调用startsoftap了，通过SoftApManager往下调用，会调用到WifiNative,这儿就开始往hal层调用了

rameworks/opt/net/wifi/service/java/com/android/server/wifi/SoftApManager.java

    private int startSoftAp() {Log.e(TAG, "wqy-startSoftAp");SoftApConfiguration config = mApConfig.getSoftApConfiguration();if (config == null || config.getSsid() == null) {Log.e(TAG, "Unable to start soft AP without valid configuration");return ERROR_GENERIC;}Log.d(TAG, "band " + config.getBand() + " iface "+ mApInterfaceName + " country " + mCountryCode);if (!mWifiNative.startSoftAp(mApInterfaceName,localConfigBuilder.build(), mSoftApListener)) {Log.e(TAG, "Soft AP start failed");return ERROR_GENERIC;}Log.d(TAG, "Soft AP is started ");return SUCCESS;}

接下来就是WifiCondManager注册回调，hostapdHal调用底层接口

frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiNative.java

    /*** Start Soft AP operation using the provided configuration.** @param ifaceName Name of the interface.* @param config Configuration to use for the soft ap created.* @param listener Callback for AP events.* @return true on success, false otherwise.*/public boolean startSoftAp(@NonNull String ifaceName, SoftApConfiguration config, SoftApListener listener) {Log.e(TAG, "wqy-startSoftAp");if (!mWifiCondManager.registerApCallback(ifaceName, Runnable::run, listener)) {Log.e(TAG, "Failed to register ap listener");return false;}Log.e(TAG, "wqy-startSoftAp, mWifiCondManager.registerApCallback is ok");if (!mHostapdHal.addAccessPoint(ifaceName, config, listener::onFailure)) {Log.e(TAG, "Failed to add acccess point");mWifiMetrics.incrementNumSetupSoftApInterfaceFailureDueToHostapd();return false;}Log.e(TAG, "wqy-startSoftAp, mHostapdHal.addAccessPoint is ok");return true;}

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