diff --git a/Tethering/AndroidManifest.xml b/Tethering/AndroidManifest.xml
index 2b2fe45..e6444f3 100644
--- a/Tethering/AndroidManifest.xml
+++ b/Tethering/AndroidManifest.xml
@@ -24,7 +24,7 @@
     <!-- Permissions must be defined here, and not in the base manifest, as the tethering
          running in the system server process does not need any permission, and having
          privileged permissions added would cause crashes on startup unless they are also
-         added to the privileged permissions whitelist for that package. -->
+         added to the privileged permissions allowlist for that package. -->
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />
diff --git a/Tethering/proguard.flags b/Tethering/proguard.flags
index 051fbd1..86b9033 100644
--- a/Tethering/proguard.flags
+++ b/Tethering/proguard.flags
@@ -1,5 +1,5 @@
 # Keep class's integer static field for MessageUtils to parsing their name.
--keep class com.android.networkstack.tethering.Tethering$TetherMasterSM {
+-keep class com.android.networkstack.tethering.Tethering$TetherMainSM {
     static final int CMD_*;
     static final int EVENT_*;
 }
diff --git a/Tethering/src/android/net/ip/IpServer.java b/Tethering/src/android/net/ip/IpServer.java
index a61fcfb..543ac19 100644
--- a/Tethering/src/android/net/ip/IpServer.java
+++ b/Tethering/src/android/net/ip/IpServer.java
@@ -196,15 +196,19 @@
     public static final int CMD_TETHER_UNREQUESTED          = BASE_IPSERVER + 2;
     // notification that this interface is down
     public static final int CMD_INTERFACE_DOWN              = BASE_IPSERVER + 3;
-    // notification from the master SM that it had trouble enabling IP Forwarding
+    // notification from the {@link Tethering.TetherMainSM} that it had trouble enabling IP
+    // Forwarding
     public static final int CMD_IP_FORWARDING_ENABLE_ERROR  = BASE_IPSERVER + 4;
-    // notification from the master SM that it had trouble disabling IP Forwarding
+    // notification from the {@link Tethering.TetherMainSM} SM that it had trouble disabling IP
+    // Forwarding
     public static final int CMD_IP_FORWARDING_DISABLE_ERROR = BASE_IPSERVER + 5;
-    // notification from the master SM that it had trouble starting tethering
+    // notification from the {@link Tethering.TetherMainSM} SM that it had trouble starting
+    // tethering
     public static final int CMD_START_TETHERING_ERROR       = BASE_IPSERVER + 6;
-    // notification from the master SM that it had trouble stopping tethering
+    // notification from the {@link Tethering.TetherMainSM} that it had trouble stopping tethering
     public static final int CMD_STOP_TETHERING_ERROR        = BASE_IPSERVER + 7;
-    // notification from the master SM that it had trouble setting the DNS forwarders
+    // notification from the {@link Tethering.TetherMainSM} that it had trouble setting the DNS
+    // forwarders
     public static final int CMD_SET_DNS_FORWARDERS_ERROR    = BASE_IPSERVER + 8;
     // the upstream connection has changed
     public static final int CMD_TETHER_CONNECTION_CHANGED   = BASE_IPSERVER + 9;
@@ -1315,7 +1319,7 @@
 
     /**
      * This state is terminal for the per interface state machine.  At this
-     * point, the master state machine should have removed this interface
+     * point, the tethering main state machine should have removed this interface
      * specific state machine from its list of possible recipients of
      * tethering requests.  The state machine itself will hang around until
      * the garbage collector finds it.
diff --git a/Tethering/src/android/net/util/TetheringMessageBase.java b/Tethering/src/android/net/util/TetheringMessageBase.java
index 1b763ce..29c0a81 100644
--- a/Tethering/src/android/net/util/TetheringMessageBase.java
+++ b/Tethering/src/android/net/util/TetheringMessageBase.java
@@ -19,7 +19,7 @@
  * This class defines Message.what base addresses for various state machine.
  */
 public class TetheringMessageBase {
-    public static final int BASE_MASTER   = 0;
+    public static final int BASE_MAIN_SM   = 0;
     public static final int BASE_IPSERVER = 100;
 
 }
diff --git a/Tethering/src/com/android/networkstack/tethering/EntitlementManager.java b/Tethering/src/com/android/networkstack/tethering/EntitlementManager.java
index 9dace70..bb7322f 100644
--- a/Tethering/src/com/android/networkstack/tethering/EntitlementManager.java
+++ b/Tethering/src/com/android/networkstack/tethering/EntitlementManager.java
@@ -296,16 +296,16 @@
      * Reference TetheringManager.TETHERING_{@code *} for each tether type.
      *
      * @param config an object that encapsulates the various tethering configuration elements.
-     * Note: this method is only called from TetherMaster on the handler thread.
+     * Note: this method is only called from @{link Tethering.TetherMainSM} on the handler thread.
      * If there are new callers from different threads, the logic should move to
-     * masterHandler to avoid race conditions.
+     * @{link Tethering.TetherMainSM} handler to avoid race conditions.
      */
     public void reevaluateSimCardProvisioning(final TetheringConfiguration config) {
         if (DBG) mLog.i("reevaluateSimCardProvisioning");
 
         if (!mHandler.getLooper().isCurrentThread()) {
             // Except for test, this log should not appear in normal flow.
-            mLog.log("reevaluateSimCardProvisioning() don't run in TetherMaster thread");
+            mLog.log("reevaluateSimCardProvisioning() don't run in TetherMainSM thread");
         }
         mEntitlementCacheValue.clear();
         mCurrentEntitlementResults.clear();
diff --git a/Tethering/src/com/android/networkstack/tethering/Tethering.java b/Tethering/src/com/android/networkstack/tethering/Tethering.java
index 3627085..804bb62 100644
--- a/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -50,7 +50,7 @@
 import static android.net.TetheringManager.TETHER_HARDWARE_OFFLOAD_FAILED;
 import static android.net.TetheringManager.TETHER_HARDWARE_OFFLOAD_STARTED;
 import static android.net.TetheringManager.TETHER_HARDWARE_OFFLOAD_STOPPED;
-import static android.net.util.TetheringMessageBase.BASE_MASTER;
+import static android.net.util.TetheringMessageBase.BASE_MAIN_SM;
 import static android.net.wifi.WifiManager.EXTRA_WIFI_AP_INTERFACE_NAME;
 import static android.net.wifi.WifiManager.EXTRA_WIFI_AP_MODE;
 import static android.net.wifi.WifiManager.EXTRA_WIFI_AP_STATE;
@@ -159,7 +159,7 @@
     private static final boolean VDBG = false;
 
     private static final Class[] sMessageClasses = {
-            Tethering.class, TetherMasterSM.class, IpServer.class
+            Tethering.class, TetherMainSM.class, IpServer.class
     };
     private static final SparseArray<String> sMagicDecoderRing =
             MessageUtils.findMessageNames(sMessageClasses);
@@ -216,7 +216,7 @@
     private final ArrayMap<String, TetherState> mTetherStates;
     private final BroadcastReceiver mStateReceiver;
     private final Looper mLooper;
-    private final StateMachine mTetherMasterSM;
+    private final StateMachine mTetherMainSM;
     private final OffloadController mOffloadController;
     private final UpstreamNetworkMonitor mUpstreamNetworkMonitor;
     // TODO: Figure out how to merge this and other downstream-tracking objects
@@ -273,10 +273,10 @@
         mTetherStates = new ArrayMap<>();
         mConnectedClientsTracker = new ConnectedClientsTracker();
 
-        mTetherMasterSM = new TetherMasterSM("TetherMaster", mLooper, deps);
-        mTetherMasterSM.start();
+        mTetherMainSM = new TetherMainSM("TetherMain", mLooper, deps);
+        mTetherMainSM.start();
 
-        mHandler = mTetherMasterSM.getHandler();
+        mHandler = mTetherMainSM.getHandler();
         mOffloadController = mDeps.getOffloadController(mHandler, mLog,
                 new OffloadController.Dependencies() {
 
@@ -285,8 +285,8 @@
                         return mConfig;
                     }
                 });
-        mUpstreamNetworkMonitor = mDeps.getUpstreamNetworkMonitor(mContext, mTetherMasterSM, mLog,
-                TetherMasterSM.EVENT_UPSTREAM_CALLBACK);
+        mUpstreamNetworkMonitor = mDeps.getUpstreamNetworkMonitor(mContext, mTetherMainSM, mLog,
+                TetherMainSM.EVENT_UPSTREAM_CALLBACK);
         mForwardedDownstreams = new LinkedHashSet<>();
 
         IntentFilter filter = new IntentFilter();
@@ -294,8 +294,8 @@
         // EntitlementManager will send EVENT_UPSTREAM_PERMISSION_CHANGED when cellular upstream
         // permission is changed according to entitlement check result.
         mEntitlementMgr = mDeps.getEntitlementManager(mContext, mHandler, mLog,
-                () -> mTetherMasterSM.sendMessage(
-                TetherMasterSM.EVENT_UPSTREAM_PERMISSION_CHANGED));
+                () -> mTetherMainSM.sendMessage(
+                TetherMainSM.EVENT_UPSTREAM_PERMISSION_CHANGED));
         mEntitlementMgr.setOnUiEntitlementFailedListener((int downstream) -> {
             mLog.log("OBSERVED UiEnitlementFailed");
             stopTethering(downstream);
@@ -945,7 +945,7 @@
             }
 
             if (VDBG) Log.d(TAG, "Tethering got CONNECTIVITY_ACTION: " + networkInfo.toString());
-            mTetherMasterSM.sendMessage(TetherMasterSM.CMD_UPSTREAM_CHANGED);
+            mTetherMainSM.sendMessage(TetherMainSM.CMD_UPSTREAM_CHANGED);
         }
 
         private void handleUsbAction(Intent intent) {
@@ -1170,7 +1170,7 @@
     private void disableWifiP2pIpServingLockedIfNeeded(String ifname) {
         if (TextUtils.isEmpty(ifname)) return;
 
-        disableWifiIpServingLockedCommon(TETHERING_WIFI_P2P, ifname, /* dummy */ 0);
+        disableWifiIpServingLockedCommon(TETHERING_WIFI_P2P, ifname, /* fake */ 0);
     }
 
     private void enableWifiIpServingLocked(String ifname, int wifiIpMode) {
@@ -1381,23 +1381,23 @@
         return false;
     }
 
-    class TetherMasterSM extends StateMachine {
+    class TetherMainSM extends StateMachine {
         // an interface SM has requested Tethering/Local Hotspot
-        static final int EVENT_IFACE_SERVING_STATE_ACTIVE       = BASE_MASTER + 1;
+        static final int EVENT_IFACE_SERVING_STATE_ACTIVE       = BASE_MAIN_SM + 1;
         // an interface SM has unrequested Tethering/Local Hotspot
-        static final int EVENT_IFACE_SERVING_STATE_INACTIVE     = BASE_MASTER + 2;
+        static final int EVENT_IFACE_SERVING_STATE_INACTIVE     = BASE_MAIN_SM + 2;
         // upstream connection change - do the right thing
-        static final int CMD_UPSTREAM_CHANGED                   = BASE_MASTER + 3;
+        static final int CMD_UPSTREAM_CHANGED                   = BASE_MAIN_SM + 3;
         // we don't have a valid upstream conn, check again after a delay
-        static final int CMD_RETRY_UPSTREAM                     = BASE_MASTER + 4;
-        // Events from NetworkCallbacks that we process on the master state
+        static final int CMD_RETRY_UPSTREAM                     = BASE_MAIN_SM + 4;
+        // Events from NetworkCallbacks that we process on the main state
         // machine thread on behalf of the UpstreamNetworkMonitor.
-        static final int EVENT_UPSTREAM_CALLBACK                = BASE_MASTER + 5;
+        static final int EVENT_UPSTREAM_CALLBACK                = BASE_MAIN_SM + 5;
         // we treated the error and want now to clear it
-        static final int CMD_CLEAR_ERROR                        = BASE_MASTER + 6;
-        static final int EVENT_IFACE_UPDATE_LINKPROPERTIES      = BASE_MASTER + 7;
+        static final int CMD_CLEAR_ERROR                        = BASE_MAIN_SM + 6;
+        static final int EVENT_IFACE_UPDATE_LINKPROPERTIES      = BASE_MAIN_SM + 7;
         // Events from EntitlementManager to choose upstream again.
-        static final int EVENT_UPSTREAM_PERMISSION_CHANGED      = BASE_MASTER + 8;
+        static final int EVENT_UPSTREAM_PERMISSION_CHANGED      = BASE_MAIN_SM + 8;
         private final State mInitialState;
         private final State mTetherModeAliveState;
 
@@ -1425,7 +1425,7 @@
 
         private static final int UPSTREAM_SETTLE_TIME_MS     = 10000;
 
-        TetherMasterSM(String name, Looper looper, TetheringDependencies deps) {
+        TetherMainSM(String name, Looper looper, TetheringDependencies deps) {
             super(name, looper);
 
             mInitialState = new InitialState();
@@ -1479,7 +1479,7 @@
             }
         }
 
-        protected boolean turnOnMasterTetherSettings() {
+        protected boolean turnOnMainTetherSettings() {
             final TetheringConfiguration cfg = mConfig;
             try {
                 mNetd.ipfwdEnableForwarding(TAG);
@@ -1506,11 +1506,11 @@
                     return false;
                 }
             }
-            mLog.log("SET master tether settings: ON");
+            mLog.log("SET main tether settings: ON");
             return true;
         }
 
-        protected boolean turnOffMasterTetherSettings() {
+        protected boolean turnOffMainTetherSettings() {
             try {
                 mNetd.tetherStop();
             } catch (RemoteException | ServiceSpecificException e) {
@@ -1526,7 +1526,7 @@
                 return false;
             }
             transitionTo(mInitialState);
-            mLog.log("SET master tether settings: OFF");
+            mLog.log("SET main tether settings: OFF");
             return true;
         }
 
@@ -1730,7 +1730,7 @@
                     // TODO: Re-evaluate possible upstreams. Currently upstream
                     // reevaluation is triggered via received CONNECTIVITY_ACTION
                     // broadcasts that result in being passed a
-                    // TetherMasterSM.CMD_UPSTREAM_CHANGED.
+                    // TetherMainSM.CMD_UPSTREAM_CHANGED.
                     handleNewUpstreamNetworkState(null);
                     break;
                 default:
@@ -1745,9 +1745,9 @@
 
             @Override
             public void enter() {
-                // If turning on master tether settings fails, we have already
+                // If turning on main tether settings fails, we have already
                 // transitioned to an error state; exit early.
-                if (!turnOnMasterTetherSettings()) {
+                if (!turnOnMainTetherSettings()) {
                     return;
                 }
 
@@ -1819,7 +1819,7 @@
                         if (mNotifyList.isEmpty()) {
                             // This transitions us out of TetherModeAliveState,
                             // either to InitialState or an error state.
-                            turnOffMasterTetherSettings();
+                            turnOffMainTetherSettings();
                             break;
                         }
 
@@ -2329,7 +2329,7 @@
         };
     }
 
-    // TODO: Move into TetherMasterSM.
+    // TODO: Move into TetherMainSM.
     private void notifyInterfaceStateChange(IpServer who, int state, int error) {
         final String iface = who.interfaceName();
         synchronized (mPublicSync) {
@@ -2344,27 +2344,27 @@
 
         mLog.log(String.format("OBSERVED iface=%s state=%s error=%s", iface, state, error));
 
-        // If TetherMasterSM is in ErrorState, TetherMasterSM stays there.
-        // Thus we give a chance for TetherMasterSM to recover to InitialState
+        // If TetherMainSM is in ErrorState, TetherMainSM stays there.
+        // Thus we give a chance for TetherMainSM to recover to InitialState
         // by sending CMD_CLEAR_ERROR
         if (error == TETHER_ERROR_INTERNAL_ERROR) {
-            mTetherMasterSM.sendMessage(TetherMasterSM.CMD_CLEAR_ERROR, who);
+            mTetherMainSM.sendMessage(TetherMainSM.CMD_CLEAR_ERROR, who);
         }
         int which;
         switch (state) {
             case IpServer.STATE_UNAVAILABLE:
             case IpServer.STATE_AVAILABLE:
-                which = TetherMasterSM.EVENT_IFACE_SERVING_STATE_INACTIVE;
+                which = TetherMainSM.EVENT_IFACE_SERVING_STATE_INACTIVE;
                 break;
             case IpServer.STATE_TETHERED:
             case IpServer.STATE_LOCAL_ONLY:
-                which = TetherMasterSM.EVENT_IFACE_SERVING_STATE_ACTIVE;
+                which = TetherMainSM.EVENT_IFACE_SERVING_STATE_ACTIVE;
                 break;
             default:
                 Log.wtf(TAG, "Unknown interface state: " + state);
                 return;
         }
-        mTetherMasterSM.sendMessage(which, state, 0, who);
+        mTetherMainSM.sendMessage(which, state, 0, who);
         sendTetherStateChangedBroadcast();
     }
 
@@ -2384,8 +2384,8 @@
         mLog.log(String.format(
                 "OBSERVED LinkProperties update iface=%s state=%s lp=%s",
                 iface, IpServer.getStateString(state), newLp));
-        final int which = TetherMasterSM.EVENT_IFACE_UPDATE_LINKPROPERTIES;
-        mTetherMasterSM.sendMessage(which, state, 0, newLp);
+        final int which = TetherMainSM.EVENT_IFACE_UPDATE_LINKPROPERTIES;
+        mTetherMainSM.sendMessage(which, state, 0, newLp);
     }
 
     private void maybeTrackNewInterfaceLocked(final String iface) {
diff --git a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
index 320427c..b17065c 100644
--- a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
+++ b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
@@ -63,7 +63,7 @@
  * Calling #registerMobileNetworkRequest() to bring up mobile DUN/HIPRI network.
  *
  * The methods and data members of this class are only to be accessed and
- * modified from the tethering master state machine thread. Any other
+ * modified from the tethering main state machine thread. Any other
  * access semantics would necessitate the addition of locking.
  *
  * TODO: Move upstream selection logic here.
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index d37aad2..e255737 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -337,11 +337,11 @@
     }
 
     public class MockTetheringDependencies extends TetheringDependencies {
-        StateMachine mUpstreamNetworkMonitorMasterSM;
+        StateMachine mUpstreamNetworkMonitorSM;
         ArrayList<IpServer> mIpv6CoordinatorNotifyList;
 
         public void reset() {
-            mUpstreamNetworkMonitorMasterSM = null;
+            mUpstreamNetworkMonitorSM = null;
             mIpv6CoordinatorNotifyList = null;
         }
 
@@ -368,7 +368,7 @@
         @Override
         public UpstreamNetworkMonitor getUpstreamNetworkMonitor(Context ctx,
                 StateMachine target, SharedLog log, int what) {
-            mUpstreamNetworkMonitorMasterSM = target;
+            mUpstreamNetworkMonitorSM = target;
             return mUpstreamNetworkMonitor;
         }
 
@@ -911,8 +911,8 @@
         initTetheringUpstream(upstreamState);
 
         // Upstream LinkProperties changed: UpstreamNetworkMonitor sends EVENT_ON_LINKPROPERTIES.
-        mTetheringDependencies.mUpstreamNetworkMonitorMasterSM.sendMessage(
-                Tethering.TetherMasterSM.EVENT_UPSTREAM_CALLBACK,
+        mTetheringDependencies.mUpstreamNetworkMonitorSM.sendMessage(
+                Tethering.TetherMainSM.EVENT_UPSTREAM_CALLBACK,
                 UpstreamNetworkMonitor.EVENT_ON_LINKPROPERTIES,
                 0,
                 upstreamState);
@@ -1126,7 +1126,7 @@
         verify(mNetd, times(1)).ipfwdEnableForwarding(TETHERING_NAME);
         // This never gets called because of the exception thrown above.
         verify(mNetd, times(0)).tetherStartWithConfiguration(any());
-        // When the master state machine transitions to an error state it tells
+        // When the main state machine transitions to an error state it tells
         // downstream interfaces, which causes us to tell Wi-Fi about the error
         // so it can take down AP mode.
         verify(mNetd, times(1)).tetherApplyDnsInterfaces();
@@ -1753,8 +1753,8 @@
 
     @Test
     public void testUpstreamNetworkChanged() {
-        final Tethering.TetherMasterSM stateMachine = (Tethering.TetherMasterSM)
-                mTetheringDependencies.mUpstreamNetworkMonitorMasterSM;
+        final Tethering.TetherMainSM stateMachine = (Tethering.TetherMainSM)
+                mTetheringDependencies.mUpstreamNetworkMonitorSM;
         final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
         initTetheringUpstream(upstreamState);
         stateMachine.chooseUpstreamType(true);
@@ -1765,8 +1765,8 @@
 
     @Test
     public void testUpstreamCapabilitiesChanged() {
-        final Tethering.TetherMasterSM stateMachine = (Tethering.TetherMasterSM)
-                mTetheringDependencies.mUpstreamNetworkMonitorMasterSM;
+        final Tethering.TetherMainSM stateMachine = (Tethering.TetherMainSM)
+                mTetheringDependencies.mUpstreamNetworkMonitorSM;
         final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
         initTetheringUpstream(upstreamState);
         stateMachine.chooseUpstreamType(true);
@@ -1891,8 +1891,8 @@
                 any(), any());
         reset(mNetd, mUsbManager);
         upstreamNetwork = buildV4WifiUpstreamState(ipv4Address, 30, wifiNetwork);
-        mTetheringDependencies.mUpstreamNetworkMonitorMasterSM.sendMessage(
-                Tethering.TetherMasterSM.EVENT_UPSTREAM_CALLBACK,
+        mTetheringDependencies.mUpstreamNetworkMonitorSM.sendMessage(
+                Tethering.TetherMainSM.EVENT_UPSTREAM_CALLBACK,
                 UpstreamNetworkMonitor.EVENT_ON_LINKPROPERTIES,
                 0,
                 upstreamNetwork);
@@ -1929,8 +1929,8 @@
 
         final UpstreamNetworkState upstreamNetwork = buildV4WifiUpstreamState(
                 upstreamAddress, 16, wifiNetwork);
-        mTetheringDependencies.mUpstreamNetworkMonitorMasterSM.sendMessage(
-                Tethering.TetherMasterSM.EVENT_UPSTREAM_CALLBACK,
+        mTetheringDependencies.mUpstreamNetworkMonitorSM.sendMessage(
+                Tethering.TetherMainSM.EVENT_UPSTREAM_CALLBACK,
                 UpstreamNetworkMonitor.EVENT_ON_LINKPROPERTIES,
                 0,
                 upstreamNetwork);