diff options
author | Irfan Sheriff <isheriff@google.com> | 2010-11-11 16:40:06 -0800 |
---|---|---|
committer | Irfan Sheriff <isheriff@google.com> | 2010-11-18 16:58:08 -0800 |
commit | 19d245b792e1d941fbba9b04ae20ce9d6e6e18f8 (patch) | |
tree | 4d4bd185a5b0259cd0e6eca26ca2c5c5135812c0 | |
parent | 7200ab4a8f61b4aed25f9536ae29051e02503563 (diff) | |
download | frameworks_base-19d245b792e1d941fbba9b04ae20ce9d6e6e18f8.zip frameworks_base-19d245b792e1d941fbba9b04ae20ce9d6e6e18f8.tar.gz frameworks_base-19d245b792e1d941fbba9b04ae20ce9d6e6e18f8.tar.bz2 |
Split SupplicantStateTracker and refactor
- Move SupplicantStateTracker into a seperate file. In the
process clean up code that needs to be present only in SupplicantStateTracker
- Retry twice for password failures
- Clean up supplicant state handling. Dont treat supplicant states
as HSM what values. Instead, just retain SUPPLICANT_STATE_CHANGE
- Add event logging in SupplicantStateTracker
- Move scan handling out SupplicantStateTracker
Change-Id: I083e1c40ef5a858164493b1440b82c5751b3bfb5
-rw-r--r-- | wifi/java/android/net/wifi/SupplicantStateTracker.java | 333 | ||||
-rw-r--r-- | wifi/java/android/net/wifi/WifiStateMachine.java | 695 |
2 files changed, 513 insertions, 515 deletions
diff --git a/wifi/java/android/net/wifi/SupplicantStateTracker.java b/wifi/java/android/net/wifi/SupplicantStateTracker.java new file mode 100644 index 0000000..a83a0ad --- /dev/null +++ b/wifi/java/android/net/wifi/SupplicantStateTracker.java @@ -0,0 +1,333 @@ +/* + * Copyright (C) 2010 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 android.net.wifi; + +import com.android.internal.util.HierarchicalState; +import com.android.internal.util.HierarchicalStateMachine; + +import android.net.wifi.WifiStateMachine.StateChangeResult; +import android.content.Context; +import android.content.Intent; +import android.os.Handler; +import android.os.Message; +import android.os.Parcelable; +import android.util.Log; + +/** + * Tracks the state changes in supplicant and provides functionality + * that is based on these state changes: + * - detect a failed WPA handshake that loops indefinitely + * - password failure handling + * - Enable networks after a WPS success/failure + */ +class SupplicantStateTracker extends HierarchicalStateMachine { + + private static final String TAG = "SupplicantStateTracker"; + private static final boolean DBG = false; + + private WifiStateMachine mWifiStateMachine; + private int mPasswordFailuresCount = 0; + /* Indicates authentication failure in supplicant broadcast. + * TODO: enhance auth failure reporting to include notification + * for all type of failures: EAP, WPS & WPA networks */ + private boolean mAuthFailureInSupplicantBroadcast = false; + + /* Maximum retries on a password failure notification */ + private static final int MAX_RETRIES_ON_PASSWORD_FAILURE = 2; + + /* Track if WPS was started since we need to re-enable networks + * and load configuration afterwards */ + private boolean mWpsStarted = false; + + private Context mContext; + + private HierarchicalState mUninitializedState = new UninitializedState(); + private HierarchicalState mDefaultState = new DefaultState(); + private HierarchicalState mInactiveState = new InactiveState(); + private HierarchicalState mDisconnectState = new DisconnectedState(); + private HierarchicalState mScanState = new ScanState(); + private HierarchicalState mHandshakeState = new HandshakeState(); + private HierarchicalState mCompletedState = new CompletedState(); + private HierarchicalState mDormantState = new DormantState(); + + public SupplicantStateTracker(Context context, WifiStateMachine wsm, Handler target) { + super(TAG, target.getLooper()); + + mContext = context; + mWifiStateMachine = wsm; + addState(mDefaultState); + addState(mUninitializedState, mDefaultState); + addState(mInactiveState, mDefaultState); + addState(mDisconnectState, mDefaultState); + addState(mScanState, mDefaultState); + addState(mHandshakeState, mDefaultState); + addState(mCompletedState, mDefaultState); + addState(mDormantState, mDefaultState); + + setInitialState(mUninitializedState); + + //start the state machine + start(); + } + + public void resetSupplicantState() { + transitionTo(mUninitializedState); + } + + + private void transitionOnSupplicantStateChange(StateChangeResult stateChangeResult) { + SupplicantState supState = (SupplicantState) stateChangeResult.state; + + if (DBG) Log.d(TAG, "Supplicant state: " + supState.toString() + "\n"); + + switch (supState) { + case DISCONNECTED: + transitionTo(mDisconnectState); + break; + case SCANNING: + transitionTo(mScanState); + break; + case ASSOCIATING: + case ASSOCIATED: + case FOUR_WAY_HANDSHAKE: + case GROUP_HANDSHAKE: + transitionTo(mHandshakeState); + break; + case COMPLETED: + transitionTo(mCompletedState); + break; + case DORMANT: + transitionTo(mDormantState); + break; + case INACTIVE: + transitionTo(mInactiveState); + break; + case UNINITIALIZED: + case INVALID: + transitionTo(mUninitializedState); + break; + default: + Log.e(TAG, "Unknown supplicant state " + supState); + break; + } + } + + private void sendSupplicantStateChangedBroadcast(StateChangeResult sc, boolean failedAuth) { + Intent intent = new Intent(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION); + intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT + | Intent.FLAG_RECEIVER_REPLACE_PENDING); + intent.putExtra(WifiManager.EXTRA_NEW_STATE, (Parcelable)sc.state); + if (failedAuth) { + intent.putExtra( + WifiManager.EXTRA_SUPPLICANT_ERROR, + WifiManager.ERROR_AUTHENTICATING); + } + mContext.sendStickyBroadcast(intent); + } + + /******************************************************** + * HSM states + *******************************************************/ + + class DefaultState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + } + @Override + public boolean processMessage(Message message) { + if (DBG) Log.d(TAG, getName() + message.toString() + "\n"); + switch (message.what) { + case WifiStateMachine.PASSWORD_MAY_BE_INCORRECT_EVENT: + mPasswordFailuresCount++; + mAuthFailureInSupplicantBroadcast = true; + break; + case WifiStateMachine.CMD_START_WPS_PBC: + case WifiStateMachine.CMD_START_WPS_PIN_FROM_AP: + case WifiStateMachine.CMD_START_WPS_PIN_FROM_DEVICE: + mWpsStarted = true; + break; + case WifiStateMachine.SUPPLICANT_STATE_CHANGE_EVENT: + StateChangeResult stateChangeResult = (StateChangeResult) message.obj; + sendSupplicantStateChangedBroadcast(stateChangeResult, + mAuthFailureInSupplicantBroadcast); + mAuthFailureInSupplicantBroadcast = false; + transitionOnSupplicantStateChange(stateChangeResult); + break; + default: + Log.e(TAG, "Ignoring " + message); + break; + } + return HANDLED; + } + } + + class UninitializedState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + mWifiStateMachine.setNetworkAvailable(false); + } + @Override + public void exit() { + mWifiStateMachine.setNetworkAvailable(true); + } + } + + class InactiveState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + /* A failed WPS connection */ + if (mWpsStarted) { + Log.e(TAG, "WPS set up failed, enabling other networks"); + WifiConfigStore.enableAllNetworks(); + mWpsStarted = false; + } + mWifiStateMachine.setNetworkAvailable(false); + } + @Override + public void exit() { + mWifiStateMachine.setNetworkAvailable(true); + } + } + + + class DisconnectedState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + /* If a disconnect event happens after password key failure + * exceeds maximum retries, disable the network + */ + + Message message = getCurrentMessage(); + StateChangeResult stateChangeResult = (StateChangeResult) message.obj; + + if (mPasswordFailuresCount >= MAX_RETRIES_ON_PASSWORD_FAILURE) { + Log.d(TAG, "Failed to authenticate, disabling network " + + stateChangeResult.networkId); + WifiConfigStore.disableNetwork(stateChangeResult.networkId); + mPasswordFailuresCount = 0; + } + } + } + + class ScanState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + } + } + + class HandshakeState extends HierarchicalState { + /** + * The max number of the WPA supplicant loop iterations before we + * decide that the loop should be terminated: + */ + private static final int MAX_SUPPLICANT_LOOP_ITERATIONS = 4; + private int mLoopDetectIndex; + private int mLoopDetectCount; + + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + mLoopDetectIndex = 0; + mLoopDetectCount = 0; + } + @Override + public boolean processMessage(Message message) { + if (DBG) Log.d(TAG, getName() + message.toString() + "\n"); + switch (message.what) { + case WifiStateMachine.SUPPLICANT_STATE_CHANGE_EVENT: + StateChangeResult stateChangeResult = (StateChangeResult) message.obj; + SupplicantState state = (SupplicantState) stateChangeResult.state; + if (state == SupplicantState.ASSOCIATING || + state == SupplicantState.ASSOCIATED || + state == SupplicantState.FOUR_WAY_HANDSHAKE || + state == SupplicantState.GROUP_HANDSHAKE) { + if (mLoopDetectIndex > state.ordinal()) { + mLoopDetectCount++; + } + if (mLoopDetectCount > MAX_SUPPLICANT_LOOP_ITERATIONS) { + Log.d(TAG, "Supplicant loop detected, disabling network " + + stateChangeResult.networkId); + WifiConfigStore.disableNetwork(stateChangeResult.networkId); + } + mLoopDetectIndex = state.ordinal(); + sendSupplicantStateChangedBroadcast(stateChangeResult, + mAuthFailureInSupplicantBroadcast); + } else { + //Have the DefaultState handle the transition + return NOT_HANDLED; + } + break; + default: + return NOT_HANDLED; + } + return HANDLED; + } + } + + class CompletedState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + /* Reset password failure count */ + mPasswordFailuresCount = 0; + + /* A successful WPS connection */ + if (mWpsStarted) { + WifiConfigStore.enableAllNetworks(); + WifiConfigStore.loadConfiguredNetworks(); + mWpsStarted = false; + } + } + @Override + public boolean processMessage(Message message) { + if (DBG) Log.d(TAG, getName() + message.toString() + "\n"); + switch(message.what) { + case WifiStateMachine.SUPPLICANT_STATE_CHANGE_EVENT: + StateChangeResult stateChangeResult = (StateChangeResult) message.obj; + SupplicantState state = (SupplicantState) stateChangeResult.state; + sendSupplicantStateChangedBroadcast(stateChangeResult, + mAuthFailureInSupplicantBroadcast); + /* Ignore a re-auth in completed state */ + if (state == SupplicantState.ASSOCIATING || + state == SupplicantState.ASSOCIATED || + state == SupplicantState.FOUR_WAY_HANDSHAKE || + state == SupplicantState.GROUP_HANDSHAKE || + state == SupplicantState.COMPLETED) { + break; + } + transitionOnSupplicantStateChange(stateChangeResult); + break; + default: + return NOT_HANDLED; + } + return HANDLED; + } + } + + //TODO: remove after getting rid of the state in supplicant + class DormantState extends HierarchicalState { + @Override + public void enter() { + if (DBG) Log.d(TAG, getName() + "\n"); + } + } +}
\ No newline at end of file diff --git a/wifi/java/android/net/wifi/WifiStateMachine.java b/wifi/java/android/net/wifi/WifiStateMachine.java index 95e2df3..90abd02 100644 --- a/wifi/java/android/net/wifi/WifiStateMachine.java +++ b/wifi/java/android/net/wifi/WifiStateMachine.java @@ -49,8 +49,6 @@ import android.net.NetworkInfo.DetailedState; import android.net.LinkProperties; import android.os.Binder; import android.os.Message; -import android.os.Parcelable; -import android.os.Handler; import android.os.IBinder; import android.os.INetworkManagementService; import android.os.PowerManager; @@ -93,8 +91,6 @@ import java.util.regex.Pattern; * * @hide */ -//TODO: we still need frequent scanning for the case when -// we issue disconnect but need scan results for open network notification public class WifiStateMachine extends HierarchicalStateMachine { private static final String TAG = "WifiStateMachine"; @@ -120,11 +116,17 @@ public class WifiStateMachine extends HierarchicalStateMachine { private String mLastBssid; private int mLastNetworkId; private boolean mEnableRssiPolling = false; - private boolean mPasswordKeyMayBeIncorrect = false; + private int mRssiPollToken = 0; private int mReconnectCount = 0; private boolean mIsScanMode = false; /** + * Interval in milliseconds between polling for RSSI + * and linkspeed information + */ + private static final int POLL_RSSI_INTERVAL_MSECS = 3000; + + /** * Instance of the bluetooth headset helper. This needs to be created * early because there is a delay before it actually 'connects', as * noted by its javadoc. If we check before it is connected, it will be @@ -148,9 +150,6 @@ public class WifiStateMachine extends HierarchicalStateMachine { /* Connection to a specific network involves disabling all networks, * this flag tracks if networks need to be re-enabled */ private boolean mEnableAllNetworks = false; - /* Track if WPS was started since we need to re-enable networks - * and load configuration afterwards */ - private boolean mWpsStarted = false; private AlarmManager mAlarmManager; private PendingIntent mScanIntent; @@ -166,95 +165,95 @@ public class WifiStateMachine extends HierarchicalStateMachine { private static final int EVENTLOG_SUPPLICANT_STATE_CHANGED = 50023; /* Load the driver */ - private static final int CMD_LOAD_DRIVER = 1; + static final int CMD_LOAD_DRIVER = 1; /* Unload the driver */ - private static final int CMD_UNLOAD_DRIVER = 2; + static final int CMD_UNLOAD_DRIVER = 2; /* Indicates driver load succeeded */ - private static final int CMD_LOAD_DRIVER_SUCCESS = 3; + static final int CMD_LOAD_DRIVER_SUCCESS = 3; /* Indicates driver load failed */ - private static final int CMD_LOAD_DRIVER_FAILURE = 4; + static final int CMD_LOAD_DRIVER_FAILURE = 4; /* Indicates driver unload succeeded */ - private static final int CMD_UNLOAD_DRIVER_SUCCESS = 5; + static final int CMD_UNLOAD_DRIVER_SUCCESS = 5; /* Indicates driver unload failed */ - private static final int CMD_UNLOAD_DRIVER_FAILURE = 6; + static final int CMD_UNLOAD_DRIVER_FAILURE = 6; /* Set bluetooth headset proxy */ - private static final int CMD_SET_BLUETOOTH_HEADSET_PROXY = 7; + static final int CMD_SET_BLUETOOTH_HEADSET_PROXY = 7; /* Set bluetooth A2dp proxy */ - private static final int CMD_SET_BLUETOOTH_A2DP_PROXY = 8; + static final int CMD_SET_BLUETOOTH_A2DP_PROXY = 8; /* Start the supplicant */ - private static final int CMD_START_SUPPLICANT = 11; + static final int CMD_START_SUPPLICANT = 11; /* Stop the supplicant */ - private static final int CMD_STOP_SUPPLICANT = 12; + static final int CMD_STOP_SUPPLICANT = 12; /* Start the driver */ - private static final int CMD_START_DRIVER = 13; + static final int CMD_START_DRIVER = 13; /* Start the driver */ - private static final int CMD_STOP_DRIVER = 14; + static final int CMD_STOP_DRIVER = 14; /* Indicates DHCP succeded */ - private static final int CMD_IP_CONFIG_SUCCESS = 15; + static final int CMD_IP_CONFIG_SUCCESS = 15; /* Indicates DHCP failed */ - private static final int CMD_IP_CONFIG_FAILURE = 16; + static final int CMD_IP_CONFIG_FAILURE = 16; /* Re-configure interface */ - private static final int CMD_RECONFIGURE_IP = 17; + static final int CMD_RECONFIGURE_IP = 17; /* Start the soft access point */ - private static final int CMD_START_AP = 21; + static final int CMD_START_AP = 21; /* Stop the soft access point */ - private static final int CMD_STOP_AP = 22; + static final int CMD_STOP_AP = 22; /* Supplicant events */ /* Connection to supplicant established */ - private static final int SUP_CONNECTION_EVENT = 31; + static final int SUP_CONNECTION_EVENT = 31; /* Connection to supplicant lost */ - private static final int SUP_DISCONNECTION_EVENT = 32; + static final int SUP_DISCONNECTION_EVENT = 32; /* Driver start completed */ - private static final int DRIVER_START_EVENT = 33; + static final int DRIVER_START_EVENT = 33; /* Driver stop completed */ - private static final int DRIVER_STOP_EVENT = 34; + static final int DRIVER_STOP_EVENT = 34; /* Network connection completed */ - private static final int NETWORK_CONNECTION_EVENT = 36; + static final int NETWORK_CONNECTION_EVENT = 36; /* Network disconnection completed */ - private static final int NETWORK_DISCONNECTION_EVENT = 37; + static final int NETWORK_DISCONNECTION_EVENT = 37; /* Scan results are available */ - private static final int SCAN_RESULTS_EVENT = 38; + static final int SCAN_RESULTS_EVENT = 38; /* Supplicate state changed */ - private static final int SUPPLICANT_STATE_CHANGE_EVENT = 39; + static final int SUPPLICANT_STATE_CHANGE_EVENT = 39; /* Password may be incorrect */ - private static final int PASSWORD_MAY_BE_INCORRECT_EVENT = 40; + static final int PASSWORD_MAY_BE_INCORRECT_EVENT = 40; /* Supplicant commands */ /* Is supplicant alive ? */ - private static final int CMD_PING_SUPPLICANT = 51; + static final int CMD_PING_SUPPLICANT = 51; /* Add/update a network configuration */ - private static final int CMD_ADD_OR_UPDATE_NETWORK = 52; + static final int CMD_ADD_OR_UPDATE_NETWORK = 52; /* Delete a network */ - private static final int CMD_REMOVE_NETWORK = 53; + static final int CMD_REMOVE_NETWORK = 53; /* Enable a network. The device will attempt a connection to the given network. */ - private static final int CMD_ENABLE_NETWORK = 54; + static final int CMD_ENABLE_NETWORK = 54; /* Disable a network. The device does not attempt a connection to the given network. */ - private static final int CMD_DISABLE_NETWORK = 55; + static final int CMD_DISABLE_NETWORK = 55; /* Blacklist network. De-prioritizes the given BSSID for connection. */ - private static final int CMD_BLACKLIST_NETWORK = 56; + static final int CMD_BLACKLIST_NETWORK = 56; /* Clear the blacklist network list */ - private static final int CMD_CLEAR_BLACKLIST = 57; + static final int CMD_CLEAR_BLACKLIST = 57; /* Save configuration */ - private static final int CMD_SAVE_CONFIG = 58; + static final int CMD_SAVE_CONFIG = 58; /* Supplicant commands after driver start*/ /* Initiate a scan */ - private static final int CMD_START_SCAN = 71; + static final int CMD_START_SCAN = 71; /* Set scan mode. CONNECT_MODE or SCAN_ONLY_MODE */ - private static final int CMD_SET_SCAN_MODE = 72; + static final int CMD_SET_SCAN_MODE = 72; /* Set scan type. SCAN_ACTIVE or SCAN_PASSIVE */ - private static final int CMD_SET_SCAN_TYPE = 73; + static final int CMD_SET_SCAN_TYPE = 73; /* Disconnect from a network */ - private static final int CMD_DISCONNECT = 74; + static final int CMD_DISCONNECT = 74; /* Reconnect to a network */ - private static final int CMD_RECONNECT = 75; + static final int CMD_RECONNECT = 75; /* Reassociate to a network */ - private static final int CMD_REASSOCIATE = 76; + static final int CMD_REASSOCIATE = 76; /* Controls power mode and suspend mode optimizations * * When high perf mode is enabled, power mode is set to @@ -268,30 +267,30 @@ public class WifiStateMachine extends HierarchicalStateMachine { * - turn off roaming * - DTIM wake up settings */ - private static final int CMD_SET_HIGH_PERF_MODE = 77; + static final int CMD_SET_HIGH_PERF_MODE = 77; /* Set bluetooth co-existence * BLUETOOTH_COEXISTENCE_MODE_ENABLED * BLUETOOTH_COEXISTENCE_MODE_DISABLED * BLUETOOTH_COEXISTENCE_MODE_SENSE */ - private static final int CMD_SET_BLUETOOTH_COEXISTENCE = 78; + static final int CMD_SET_BLUETOOTH_COEXISTENCE = 78; /* Enable/disable bluetooth scan mode * true(1) * false(0) */ - private static final int CMD_SET_BLUETOOTH_SCAN_MODE = 79; + static final int CMD_SET_BLUETOOTH_SCAN_MODE = 79; /* Set the country code */ - private static final int CMD_SET_COUNTRY_CODE = 80; + static final int CMD_SET_COUNTRY_CODE = 80; /* Request connectivity manager wake lock before driver stop */ - private static final int CMD_REQUEST_CM_WAKELOCK = 81; + static final int CMD_REQUEST_CM_WAKELOCK = 81; /* Enables RSSI poll */ - private static final int CMD_ENABLE_RSSI_POLL = 82; + static final int CMD_ENABLE_RSSI_POLL = 82; /* RSSI poll */ - private static final int CMD_RSSI_POLL = 83; + static final int CMD_RSSI_POLL = 83; /* Set up packet filtering */ - private static final int CMD_START_PACKET_FILTERING = 84; + static final int CMD_START_PACKET_FILTERING = 84; /* Clear packet filter */ - private static final int CMD_STOP_PACKET_FILTERING = 85; + static final int CMD_STOP_PACKET_FILTERING = 85; /* Connect to a specified network (network id * or WifiConfiguration) This involves increasing * the priority of the network, enabling the network @@ -300,32 +299,29 @@ public class WifiStateMachine extends HierarchicalStateMachine { * an existing network. All the networks get enabled * upon a successful connection or a failure. */ - private static final int CMD_CONNECT_NETWORK = 86; + static final int CMD_CONNECT_NETWORK = 86; /* Save the specified network. This involves adding * an enabled network (if new) and updating the * config and issuing a save on supplicant config. */ - private static final int CMD_SAVE_NETWORK = 87; + static final int CMD_SAVE_NETWORK = 87; /* Delete the specified network. This involves * removing the network and issuing a save on * supplicant config. */ - private static final int CMD_FORGET_NETWORK = 88; + static final int CMD_FORGET_NETWORK = 88; /* Start Wi-Fi protected setup push button configuration */ - private static final int CMD_START_WPS_PBC = 89; + static final int CMD_START_WPS_PBC = 89; /* Start Wi-Fi protected setup pin method configuration with pin obtained from AP */ - private static final int CMD_START_WPS_PIN_FROM_AP = 90; + static final int CMD_START_WPS_PIN_FROM_AP = 90; /* Start Wi-Fi protected setup pin method configuration with pin obtained from device */ - private static final int CMD_START_WPS_PIN_FROM_DEVICE = 91; + static final int CMD_START_WPS_PIN_FROM_DEVICE = 91; /* Set the frequency band */ - private static final int CMD_SET_FREQUENCY_BAND = 92; + static final int CMD_SET_FREQUENCY_BAND = 92; - /** - * Interval in milliseconds between polling for connection - * status items that are not sent via asynchronous events. - * An example is RSSI (signal strength). - */ - private static final int POLL_RSSI_INTERVAL_MSECS = 3000; + /* Commands from the SupplicantStateTracker */ + /* Indicates whether a wifi network is available for connection */ + static final int CMD_SET_NETWORK_AVAILABLE = 111; private static final int CONNECT_MODE = 1; private static final int SCAN_ONLY_MODE = 2; @@ -463,7 +459,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { mDhcpInfo = new DhcpInfo(); mWifiInfo = new WifiInfo(); mInterfaceName = SystemProperties.get("wifi.interface", "tiwlan0"); - mSupplicantStateTracker = new SupplicantStateTracker(context, getHandler()); + mSupplicantStateTracker = new SupplicantStateTracker(context, this, getHandler()); mLinkProperties = new LinkProperties(); BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); @@ -985,8 +981,6 @@ public class WifiStateMachine extends HierarchicalStateMachine { sb.append("mLastBssid ").append(mLastBssid).append(LS); sb.append("mLastNetworkId ").append(mLastNetworkId).append(LS); sb.append("mEnableAllNetworks ").append(mEnableAllNetworks).append(LS); - sb.append("mEnableRssiPolling ").append(mEnableRssiPolling).append(LS); - sb.append("mPasswordKeyMayBeIncorrect ").append(mPasswordKeyMayBeIncorrect).append(LS); sb.append("mReconnectCount ").append(mReconnectCount).append(LS); sb.append("mIsScanMode ").append(mIsScanMode).append(LS); sb.append("Supplicant status").append(LS) @@ -1215,6 +1209,44 @@ public class WifiStateMachine extends HierarchicalStateMachine { return null; } + /* + * Fetch RSSI and linkspeed on current connection + */ + private void fetchRssiAndLinkSpeedNative() { + int newRssi = WifiNative.getRssiCommand(); + if (newRssi != -1 && -200 < newRssi && newRssi < 256) { // screen out invalid values + /* some implementations avoid negative values by adding 256 + * so we need to adjust for that here. + */ + if (newRssi > 0) newRssi -= 256; + mWifiInfo.setRssi(newRssi); + /* + * Rather then sending the raw RSSI out every time it + * changes, we precalculate the signal level that would + * be displayed in the status bar, and only send the + * broadcast if that much more coarse-grained number + * changes. This cuts down greatly on the number of + * broadcasts, at the cost of not mWifiInforming others + * interested in RSSI of all the changes in signal + * level. + */ + // TODO: The second arg to the call below needs to be a symbol somewhere, but + // it's actually the size of an array of icons that's private + // to StatusBar Policy. + int newSignalLevel = WifiManager.calculateSignalLevel(newRssi, 4); + if (newSignalLevel != mLastSignalLevel) { + sendRssiChangeBroadcast(newRssi); + } + mLastSignalLevel = newSignalLevel; + } else { + mWifiInfo.setRssi(-200); + } + int newLinkSpeed = WifiNative.getLinkSpeedCommand(); + if (newLinkSpeed != -1) { + mWifiInfo.setLinkSpeed(newLinkSpeed); + } + } + private void setHighPerfModeEnabledNative(boolean enable) { if(!WifiNative.setSuspendOptimizationsCommand(!enable)) { Log.e(TAG, "set suspend optimizations failed!"); @@ -1336,19 +1368,6 @@ public class WifiStateMachine extends HierarchicalStateMachine { mContext.sendBroadcast(intent); } - private void sendSupplicantStateChangedBroadcast(StateChangeResult sc, boolean failedAuth) { - Intent intent = new Intent(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION); - intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT - | Intent.FLAG_RECEIVER_REPLACE_PENDING); - intent.putExtra(WifiManager.EXTRA_NEW_STATE, (Parcelable)sc.state); - if (failedAuth) { - intent.putExtra( - WifiManager.EXTRA_SUPPLICANT_ERROR, - WifiManager.ERROR_AUTHENTICATING); - } - mContext.sendStickyBroadcast(intent); - } - private void sendSupplicantConnectionChangedBroadcast(boolean connected) { if (!ActivityManagerNative.isSystemReady()) return; @@ -1370,45 +1389,6 @@ public class WifiStateMachine extends HierarchicalStateMachine { } /** - * Poll for info not reported via events - * RSSI & Linkspeed - */ - private void requestPolledInfo() { - int newRssi = WifiNative.getRssiCommand(); - if (newRssi != -1 && -200 < newRssi && newRssi < 256) { // screen out invalid values - /* some implementations avoid negative values by adding 256 - * so we need to adjust for that here. - */ - if (newRssi > 0) newRssi -= 256; - mWifiInfo.setRssi(newRssi); - /* - * Rather then sending the raw RSSI out every time it - * changes, we precalculate the signal level that would - * be displayed in the status bar, and only send the - * broadcast if that much more coarse-grained number - * changes. This cuts down greatly on the number of - * broadcasts, at the cost of not mWifiInforming others - * interested in RSSI of all the changes in signal - * level. - */ - // TODO: The second arg to the call below needs to be a symbol somewhere, but - // it's actually the size of an array of icons that's private - // to StatusBar Policy. - int newSignalLevel = WifiManager.calculateSignalLevel(newRssi, 4); - if (newSignalLevel != mLastSignalLevel) { - sendRssiChangeBroadcast(newRssi); - } - mLastSignalLevel = newSignalLevel; - } else { - mWifiInfo.setRssi(-200); - } - int newLinkSpeed = WifiNative.getLinkSpeedCommand(); - if (newLinkSpeed != -1) { - mWifiInfo.setLinkSpeed(newLinkSpeed); - } - } - - /** * Resets the Wi-Fi Connections by clearing any state, resetting any sockets * using the interface, stopping DHCP & disabling interface */ @@ -1456,7 +1436,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { * WifiMonitor * thread. */ - private static class StateChangeResult { + static class StateChangeResult { StateChangeResult(int networkId, String BSSID, Object state) { this.state = state; this.BSSID = BSSID; @@ -1548,6 +1528,9 @@ public class WifiStateMachine extends HierarchicalStateMachine { setWifiEnabled(true); } + void setNetworkAvailable(boolean available) { + sendMessage(CMD_SET_NETWORK_AVAILABLE, available ? 1 : 0); + } /******************************************************** * HSM states @@ -1576,7 +1559,9 @@ public class WifiStateMachine extends HierarchicalStateMachine { break; case CMD_ENABLE_RSSI_POLL: mEnableRssiPolling = (message.arg1 == 1); - mSupplicantStateTracker.sendMessage(CMD_ENABLE_RSSI_POLL); + break; + case CMD_SET_NETWORK_AVAILABLE: + mNetworkInfo.setIsAvailable(message.arg1 == 1); break; /* Discard */ case CMD_LOAD_DRIVER: @@ -1616,6 +1601,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { case CMD_FORGET_NETWORK: case CMD_START_WPS_PBC: case CMD_START_WPS_PIN_FROM_AP: + case CMD_RSSI_POLL: break; default: Log.e(TAG, "Error! unhandled message" + message); @@ -2136,6 +2122,9 @@ public class WifiStateMachine extends HierarchicalStateMachine { WifiNative.setScanModeCommand(false); } break; + case CMD_START_SCAN: + WifiNative.scanCommand(message.arg1 == SCAN_ACTIVE); + break; case CMD_SET_HIGH_PERF_MODE: setHighPerfModeEnabledNative(message.arg1 == 1); break; @@ -2278,9 +2267,6 @@ public class WifiStateMachine extends HierarchicalStateMachine { transitionTo(mDisconnectedState); } break; - case CMD_START_SCAN: - WifiNative.scanCommand(message.arg1 == SCAN_ACTIVE); - break; /* Ignore */ case CMD_DISCONNECT: case CMD_RECONNECT: @@ -2309,14 +2295,23 @@ public class WifiStateMachine extends HierarchicalStateMachine { StateChangeResult stateChangeResult; switch(message.what) { case PASSWORD_MAY_BE_INCORRECT_EVENT: - mPasswordKeyMayBeIncorrect = true; + mSupplicantStateTracker.sendMessage(PASSWORD_MAY_BE_INCORRECT_EVENT); break; case SUPPLICANT_STATE_CHANGE_EVENT: stateChangeResult = (StateChangeResult) message.obj; - mSupplicantStateTracker.handleEvent(stateChangeResult); - break; - case CMD_START_SCAN: - /* We need to set scan type in completed state */ + SupplicantState state = (SupplicantState) stateChangeResult.state; + // Supplicant state change + // [31-13] Reserved for future use + // [8 - 0] Supplicant state (as defined in SupplicantState.java) + // 50023 supplicant_state_changed (custom|1|5) + EventLog.writeEvent(EVENTLOG_SUPPLICANT_STATE_CHANGED, state.ordinal()); + mWifiInfo.setSupplicantState(state); + mWifiInfo.setNetworkId(stateChangeResult.networkId); + if (state == SupplicantState.ASSOCIATING) { + /* BSSID is valid only in ASSOCIATING state */ + mWifiInfo.setBSSID(stateChangeResult.BSSID); + } + Message newMsg = obtainMessage(); newMsg.copyFrom(message); mSupplicantStateTracker.sendMessage(newMsg); @@ -2375,7 +2370,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { * Upon success, the configuration list needs to be reloaded */ if (success) { - mWpsStarted = true; + mSupplicantStateTracker.sendMessage(message.what); /* Expect a disconnection from the old connection */ transitionTo(mDisconnectingState); } @@ -2388,7 +2383,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { success = WifiConfigStore.startWpsWithPinFromAccessPoint(bssid, apPin); if (success) { - mWpsStarted = true; + mSupplicantStateTracker.sendMessage(message.what); /* Expect a disconnection from the old connection */ transitionTo(mDisconnectingState); } @@ -2400,7 +2395,7 @@ public class WifiStateMachine extends HierarchicalStateMachine { mReplyChannel.replyToMessage(message, CMD_START_WPS_PIN_FROM_DEVICE, pin); if (success) { - mWpsStarted = true; + mSupplicantStateTracker.sendMessage(message.what); /* Expect a disconnection from the old connection */ transitionTo(mDisconnectingState); } @@ -2583,6 +2578,10 @@ public class WifiStateMachine extends HierarchicalStateMachine { deferMessage(message); } break; + /* Defer scan when IP is being fetched */ + case CMD_START_SCAN: + deferMessage(message); + break; case CMD_RECONFIGURE_IP: deferMessage(message); break; @@ -2619,13 +2618,11 @@ public class WifiStateMachine extends HierarchicalStateMachine { @Override public void enter() { if (DBG) Log.d(TAG, getName() + "\n"); - /* A successful WPS connection */ - if (mWpsStarted) { - WifiConfigStore.enableAllNetworks(); - WifiConfigStore.loadConfiguredNetworks(); - mWpsStarted = false; - } EventLog.writeEvent(EVENTLOG_WIFI_STATE_CHANGED, getName()); + mRssiPollToken++; + if (mEnableRssiPolling) { + sendMessage(obtainMessage(WifiStateMachine.CMD_RSSI_POLL, mRssiPollToken, 0)); + } } @Override public boolean processMessage(Message message) { @@ -2650,6 +2647,15 @@ public class WifiStateMachine extends HierarchicalStateMachine { deferMessage(message); } break; + case CMD_START_SCAN: + /* When the network is connected, re-scanning can trigger + * a reconnection. Put it in scan-only mode during scan. + * When scan results are received, the mode is switched + * back to CONNECT_MODE. + */ + WifiNative.setScanResultHandlingCommand(SCAN_ONLY_MODE); + WifiNative.scanCommand(message.arg1 == SCAN_ACTIVE); + break; /* Ignore connection to same network */ case CMD_CONNECT_NETWORK: int netId = message.arg1; @@ -2660,6 +2666,26 @@ public class WifiStateMachine extends HierarchicalStateMachine { /* Ignore */ case NETWORK_CONNECTION_EVENT: break; + case CMD_RSSI_POLL: + if (message.arg1 == mRssiPollToken) { + // Get Info and continue polling + fetchRssiAndLinkSpeedNative(); + sendMessageDelayed(obtainMessage(WifiStateMachine.CMD_RSSI_POLL, + mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS); + } else { + // Polling has completed + } + break; + case CMD_ENABLE_RSSI_POLL: + mEnableRssiPolling = (message.arg1 == 1); + mRssiPollToken++; + if (mEnableRssiPolling) { + // first poll + fetchRssiAndLinkSpeedNative(); + sendMessageDelayed(obtainMessage(WifiStateMachine.CMD_RSSI_POLL, + mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS); + } + break; default: return NOT_HANDLED; } @@ -2686,6 +2712,10 @@ public class WifiStateMachine extends HierarchicalStateMachine { deferMessage(message); } break; + /* Handle in DisconnectedState */ + case SUPPLICANT_STATE_CHANGE_EVENT: + deferMessage(message); + break; default: return NOT_HANDLED; } @@ -2734,6 +2764,12 @@ public class WifiStateMachine extends HierarchicalStateMachine { /* Ignore network disconnect */ case NETWORK_DISCONNECTION_EVENT: break; + case SUPPLICANT_STATE_CHANGE_EVENT: + StateChangeResult stateChangeResult = (StateChangeResult) message.obj; + SupplicantState state = (SupplicantState) stateChangeResult.state; + setDetailedState(WifiInfo.getDetailedStateOf(state)); + /* DriverStartedState does the rest of the handling */ + return NOT_HANDLED; default: return NOT_HANDLED; } @@ -2795,375 +2831,4 @@ public class WifiStateMachine extends HierarchicalStateMachine { return HANDLED; } } - - - class SupplicantStateTracker extends HierarchicalStateMachine { - - private int mRssiPollToken = 0; - - /** - * The max number of the WPA supplicant loop iterations before we - * decide that the loop should be terminated: - */ - private static final int MAX_SUPPLICANT_LOOP_ITERATIONS = 4; - private int mLoopDetectIndex = 0; - private int mLoopDetectCount = 0; - - /** - * Supplicant state change commands follow - * the ordinal values defined in SupplicantState.java - */ - private static final int DISCONNECTED = 0; - private static final int INACTIVE = 1; - private static final int SCANNING = 2; - private static final int ASSOCIATING = 3; - private static final int ASSOCIATED = 4; - private static final int FOUR_WAY_HANDSHAKE = 5; - private static final int GROUP_HANDSHAKE = 6; - private static final int COMPLETED = 7; - private static final int DORMANT = 8; - private static final int UNINITIALIZED = 9; - private static final int INVALID = 10; - - private HierarchicalState mUninitializedState = new UninitializedState(); - private HierarchicalState mInitializedState = new InitializedState();; - private HierarchicalState mInactiveState = new InactiveState(); - private HierarchicalState mDisconnectState = new DisconnectedState(); - private HierarchicalState mScanState = new ScanState(); - private HierarchicalState mConnectState = new ConnectState(); - private HierarchicalState mHandshakeState = new HandshakeState(); - private HierarchicalState mCompletedState = new CompletedState(); - private HierarchicalState mDormantState = new DormantState(); - - public SupplicantStateTracker(Context context, Handler target) { - super(TAG, target.getLooper()); - - addState(mUninitializedState); - addState(mInitializedState); - addState(mInactiveState, mInitializedState); - addState(mDisconnectState, mInitializedState); - addState(mScanState, mInitializedState); - addState(mConnectState, mInitializedState); - addState(mHandshakeState, mConnectState); - addState(mCompletedState, mConnectState); - addState(mDormantState, mInitializedState); - - setInitialState(mUninitializedState); - - //start the state machine - start(); - } - - public void handleEvent(StateChangeResult stateChangeResult) { - SupplicantState newState = (SupplicantState) stateChangeResult.state; - - // Supplicant state change - // [31-13] Reserved for future use - // [8 - 0] Supplicant state (as defined in SupplicantState.java) - // 50023 supplicant_state_changed (custom|1|5) - EventLog.writeEvent(EVENTLOG_SUPPLICANT_STATE_CHANGED, newState.ordinal()); - - sendMessage(obtainMessage(newState.ordinal(), stateChangeResult)); - } - - public void resetSupplicantState() { - transitionTo(mUninitializedState); - } - - private void resetLoopDetection() { - mLoopDetectCount = 0; - mLoopDetectIndex = 0; - } - - private boolean handleTransition(Message msg) { - if (DBG) Log.d(TAG, getName() + msg.toString() + "\n"); - switch (msg.what) { - case DISCONNECTED: - transitionTo(mDisconnectState); - break; - case SCANNING: - transitionTo(mScanState); - break; - case ASSOCIATING: - StateChangeResult stateChangeResult = (StateChangeResult) msg.obj; - /* BSSID is valid only in ASSOCIATING state */ - mWifiInfo.setBSSID(stateChangeResult.BSSID); - //$FALL-THROUGH$ - case ASSOCIATED: - case FOUR_WAY_HANDSHAKE: - case GROUP_HANDSHAKE: - transitionTo(mHandshakeState); - break; - case COMPLETED: - transitionTo(mCompletedState); - break; - case DORMANT: - transitionTo(mDormantState); - break; - case INACTIVE: - transitionTo(mInactiveState); - break; - case UNINITIALIZED: - case INVALID: - transitionTo(mUninitializedState); - break; - default: - return NOT_HANDLED; - } - StateChangeResult stateChangeResult = (StateChangeResult) msg.obj; - SupplicantState supState = (SupplicantState) stateChangeResult.state; - setDetailedState(WifiInfo.getDetailedStateOf(supState)); - mWifiInfo.setSupplicantState(supState); - mWifiInfo.setNetworkId(stateChangeResult.networkId); - return HANDLED; - } - - /******************************************************** - * HSM states - *******************************************************/ - - class InitializedState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - } - @Override - public boolean processMessage(Message message) { - if (DBG) Log.d(TAG, getName() + message.toString() + "\n"); - switch (message.what) { - case CMD_START_SCAN: - WifiNative.scanCommand(message.arg1 == SCAN_ACTIVE); - break; - default: - if (DBG) Log.w(TAG, "Ignoring " + message); - break; - } - return HANDLED; - } - } - - class UninitializedState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - mNetworkInfo.setIsAvailable(false); - resetLoopDetection(); - mPasswordKeyMayBeIncorrect = false; - } - @Override - public boolean processMessage(Message message) { - switch(message.what) { - default: - if (!handleTransition(message)) { - if (DBG) Log.w(TAG, "Ignoring " + message); - } - break; - } - return HANDLED; - } - @Override - public void exit() { - mNetworkInfo.setIsAvailable(true); - } - } - - class InactiveState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - - /* A failed WPS connection */ - if (mWpsStarted) { - Log.e(TAG, "WPS set up failed, enabling other networks"); - WifiConfigStore.enableAllNetworks(); - mWpsStarted = false; - } - - Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - mNetworkInfo.setIsAvailable(false); - resetLoopDetection(); - mPasswordKeyMayBeIncorrect = false; - - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - } - @Override - public boolean processMessage(Message message) { - return handleTransition(message); - } - @Override - public void exit() { - mNetworkInfo.setIsAvailable(true); - } - } - - - class DisconnectedState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - resetLoopDetection(); - - /* If a disconnect event happens after a password key failure - * event, disable the network - */ - if (mPasswordKeyMayBeIncorrect) { - Log.d(TAG, "Failed to authenticate, disabling network " + - mWifiInfo.getNetworkId()); - WifiConfigStore.disableNetwork(mWifiInfo.getNetworkId()); - mPasswordKeyMayBeIncorrect = false; - sendSupplicantStateChangedBroadcast(stateChangeResult, true); - } - else { - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - } - } - @Override - public boolean processMessage(Message message) { - return handleTransition(message); - } - } - - class ScanState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - mPasswordKeyMayBeIncorrect = false; - resetLoopDetection(); - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - } - @Override - public boolean processMessage(Message message) { - return handleTransition(message); - } - } - - class ConnectState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - } - @Override - public boolean processMessage(Message message) { - switch (message.what) { - case CMD_START_SCAN: - WifiNative.setScanResultHandlingCommand(SCAN_ONLY_MODE); - WifiNative.scanCommand(message.arg1 == SCAN_ACTIVE); - break; - default: - return NOT_HANDLED; - } - return HANDLED; - } - } - - class HandshakeState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - final Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - if (mLoopDetectIndex > message.what) { - mLoopDetectCount++; - } - if (mLoopDetectCount > MAX_SUPPLICANT_LOOP_ITERATIONS) { - WifiConfigStore.disableNetwork(stateChangeResult.networkId); - mLoopDetectCount = 0; - } - - mLoopDetectIndex = message.what; - - mPasswordKeyMayBeIncorrect = false; - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - } - @Override - public boolean processMessage(Message message) { - return handleTransition(message); - } - } - - class CompletedState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - mRssiPollToken++; - if (mEnableRssiPolling) { - sendMessageDelayed(obtainMessage(CMD_RSSI_POLL, mRssiPollToken, 0), - POLL_RSSI_INTERVAL_MSECS); - } - - resetLoopDetection(); - - mPasswordKeyMayBeIncorrect = false; - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - } - @Override - public boolean processMessage(Message message) { - switch(message.what) { - case ASSOCIATING: - case ASSOCIATED: - case FOUR_WAY_HANDSHAKE: - case GROUP_HANDSHAKE: - case COMPLETED: - break; - case CMD_RSSI_POLL: - if (message.arg1 == mRssiPollToken) { - // Get Info and continue polling - requestPolledInfo(); - sendMessageDelayed(obtainMessage(CMD_RSSI_POLL, mRssiPollToken, 0), - POLL_RSSI_INTERVAL_MSECS); - } else { - // Polling has completed - } - break; - case CMD_ENABLE_RSSI_POLL: - mRssiPollToken++; - if (mEnableRssiPolling) { - // first poll - requestPolledInfo(); - sendMessageDelayed(obtainMessage(CMD_RSSI_POLL, mRssiPollToken, 0), - POLL_RSSI_INTERVAL_MSECS); - } - break; - default: - return handleTransition(message); - } - return HANDLED; - } - } - - class DormantState extends HierarchicalState { - @Override - public void enter() { - if (DBG) Log.d(TAG, getName() + "\n"); - Message message = getCurrentMessage(); - StateChangeResult stateChangeResult = (StateChangeResult) message.obj; - - resetLoopDetection(); - mPasswordKeyMayBeIncorrect = false; - - sendSupplicantStateChangedBroadcast(stateChangeResult, false); - - /* TODO: reconnect is now being handled at DHCP failure handling - * If we run into issues with staying in Dormant state, might - * need a reconnect here - */ - } - @Override - public boolean processMessage(Message message) { - return handleTransition(message); - } - } - } } |