[ONOS-5607] Add LISP router, controller and listener interfaces

Change-Id: If01738d1b0e4e264618392844d96a9cf31cbd7c7
diff --git a/protocols/lisp/api/src/main/java/org/onosproject/lisp/ctl/LispMessageListener.java b/protocols/lisp/api/src/main/java/org/onosproject/lisp/ctl/LispMessageListener.java
new file mode 100644
index 0000000..ffc540c
--- /dev/null
+++ b/protocols/lisp/api/src/main/java/org/onosproject/lisp/ctl/LispMessageListener.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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 org.onosproject.lisp.ctl;
+
+import org.onosproject.lisp.msg.protocols.LispMessage;
+
+/**
+ * Notifies providers about all LISP messages.
+ */
+public interface LispMessageListener {
+
+    /**
+     * Handles all incoming LISP messages.
+     *
+     * @param routerId the router where the message generated
+     * @param msg      raw LISP message
+     */
+    void handleIncomingMessage(LispRouterId routerId, LispMessage msg);
+
+    /**
+     * Handles all outgoing LISP messages.
+     *
+     * @param routerId the router where the message to be sent
+     * @param msg      raw LISP message
+     */
+    void handleOutgoingMessage(LispRouterId routerId, LispMessage msg);
+}