1 files changed, 49 insertions, 0 deletions
diff --git a/packages/Tethering/src/android/net/util/TetheringUtils.java b/packages/Tethering/src/android/net/util/TetheringUtils.java
new file mode 100644
index 000000000000..fa543bdce735
--- /dev/null
+++ b/packages/Tethering/src/android/net/util/TetheringUtils.java
@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+package android.net.util;
+
+import java.io.FileDescriptor;
+import java.net.SocketException;
+
+/**
+ * Native methods for tethering utilization.
+ *
+ * {@hide}
+ */
+public class TetheringUtils {
+
+    /**
+     * Offload management process need to know conntrack rules to support NAT, but it may not have
+     * permission to create netlink netfilter sockets. Create two netlink netfilter sockets and
+     * share them with offload management process.
+     */
+    public static native boolean configOffload();
+
+    /**
+     * Configures a socket for receiving ICMPv6 router solicitations and sending advertisements.
+     * @param fd the socket's {@link FileDescriptor}.
+     * @param ifIndex the interface index.
+     */
+    public static native void setupRaSocket(FileDescriptor fd, int ifIndex)
+            throws SocketException;
+
+    /**
+     * Read s as an unsigned 16-bit integer.
+     */
+    public static int uint16(short s) {
+        return s & 0xffff;
+    }
+}