diff --git a/Tethering/Android.bp b/Tethering/Android.bp
new file mode 100644
index 0000000000..a8d3018bc1
--- /dev/null
+++ b/Tethering/Android.bp
@@ -0,0 +1,62 @@
+//
+// Copyright (C) 2019 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.
+//
+
+java_defaults {
+    name: "TetheringAndroidLibraryDefaults",
+    platform_apis: true,
+    srcs: [
+        "src/**/*.java",
+    ],
+    static_libs: [
+        "androidx.annotation_annotation",
+        "tethering-client",
+    ],
+    manifest: "AndroidManifestBase.xml",
+}
+
+// Build tethering static library, used to compile both variants of the tethering.
+android_library {
+    name: "TetheringApiCurrentLib",
+    defaults: ["TetheringAndroidLibraryDefaults"],
+}
+
+// Common defaults for compiling the actual APK.
+java_defaults {
+    name: "TetheringAppDefaults",
+    platform_apis: true,
+    privileged: true,
+    resource_dirs: [
+        "res",
+    ],
+    optimize: {
+        proguard_flags_files: ["proguard.flags"],
+    },
+}
+
+// Non-updatable tethering running in the system server process for devices not using the module
+// TODO: build in-process tethering APK here.
+
+// Updatable tethering packaged as an application
+android_app {
+    name: "Tethering",
+    defaults: ["TetheringAppDefaults"],
+    static_libs: ["TetheringApiCurrentLib"],
+    certificate: "networkstack",
+    manifest: "AndroidManifest.xml",
+    use_embedded_native_libs: true,
+    // The permission configuration *must* be included to ensure security of the device
+    required: ["NetworkPermissionConfig"],
+}
diff --git a/Tethering/AndroidManifest.xml b/Tethering/AndroidManifest.xml
new file mode 100644
index 0000000000..eb51593e45
--- /dev/null
+++ b/Tethering/AndroidManifest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * Copyright (C) 2019 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.tethering"
+          android:sharedUserId="android.uid.networkstack">
+    <uses-sdk android:minSdkVersion="29" android:targetSdkVersion="29" />
+
+    <application
+        android:process="com.android.networkstack.process"
+        android:extractNativeLibs="false"
+        android:persistent="true">
+    </application>
+</manifest>
diff --git a/Tethering/AndroidManifestBase.xml b/Tethering/AndroidManifestBase.xml
new file mode 100644
index 0000000000..b9cac19943
--- /dev/null
+++ b/Tethering/AndroidManifestBase.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * Copyright (C) 2019 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.tethering"
+          android:versionCode="1"
+          android:versionName="R-initial">
+    <application
+        android:label="Tethering"
+        android:defaultToDeviceProtectedStorage="true"
+        android:directBootAware="true"
+        android:usesCleartextTraffic="true">
+    </application>
+</manifest>
diff --git a/Tethering/common/TetheringLib/Android.bp b/Tethering/common/TetheringLib/Android.bp
new file mode 100644
index 0000000000..5b01b1e038
--- /dev/null
+++ b/Tethering/common/TetheringLib/Android.bp
@@ -0,0 +1,40 @@
+//
+// Copyright (C) 2019 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.
+//
+
+// AIDL interfaces between the core system and the tethering mainline module.
+aidl_interface {
+    name: "tethering-aidl-interfaces",
+    local_include_dir: "src",
+    srcs: [
+        "src/android/net/ITetheringConnector.aidl",
+    ],
+    backend: {
+        ndk: {
+            enabled: false,
+        },
+        cpp: {
+            enabled: false,
+        },
+    },
+}
+
+java_library {
+    name: "tethering-client",
+    platform_apis: true,
+    static_libs: [
+        "tethering-aidl-interfaces-java",
+    ],
+}
diff --git a/Tethering/common/TetheringLib/src/android/net/ITetheringConnector.aidl b/Tethering/common/TetheringLib/src/android/net/ITetheringConnector.aidl
new file mode 100644
index 0000000000..443481e33f
--- /dev/null
+++ b/Tethering/common/TetheringLib/src/android/net/ITetheringConnector.aidl
@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2019, 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 perNmissions and
+ * limitations under the License.
+ */
+package android.net;
+
+/** @hide */
+oneway interface ITetheringConnector {
+}
diff --git a/Tethering/proguard.flags b/Tethering/proguard.flags
new file mode 100644
index 0000000000..77fc024a87
--- /dev/null
+++ b/Tethering/proguard.flags
@@ -0,0 +1 @@
+#TBD
diff --git a/Tethering/res/values/config.xml b/Tethering/res/values/config.xml
new file mode 100644
index 0000000000..37e679dbeb
--- /dev/null
+++ b/Tethering/res/values/config.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!--
+    OEMs that wish to change the below settings must do so via a runtime resource overlay package
+    and *NOT* by changing this file. This file is part of the tethering mainline module.
+    -->
+</resources>