Implement NDP-related classes

* Resolve ONOS-511
* Refactor: Move NDP-related classes into org.onlab.packet.ndp package
* Bugfix: payload is not properly set in testSerialize

Change-Id: Idb2dbfbd0297152c0e26ac2d5d5f8dba62824660
diff --git a/utils/misc/src/main/java/org/onlab/packet/ndp/RouterSolicitation.java b/utils/misc/src/main/java/org/onlab/packet/ndp/RouterSolicitation.java
new file mode 100644
index 0000000..5334d54
--- /dev/null
+++ b/utils/misc/src/main/java/org/onlab/packet/ndp/RouterSolicitation.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2014 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.onlab.packet.ndp;
+
+import org.onlab.packet.BasePacket;
+import org.onlab.packet.Data;
+import org.onlab.packet.IPacket;
+
+import java.nio.ByteBuffer;
+
+/**
+ * Implements ICMPv6 Router Solicitation packet format. (RFC 4861)
+ */
+public class RouterSolicitation extends BasePacket {
+    public static final byte HEADER_LENGTH = 4; // bytes
+
+    @Override
+    public byte[] serialize() {
+        byte[] payloadData = null;
+        if (this.payload != null) {
+            this.payload.setParent(this);
+            payloadData = this.payload.serialize();
+        }
+
+        int payloadLength = payloadData == null ? 0 : (short) payloadData.length;
+
+        final byte[] data = new byte[HEADER_LENGTH + payloadLength];
+        final ByteBuffer bb = ByteBuffer.wrap(data);
+
+        bb.putInt(0);
+
+        if (payloadData != null) {
+            bb.put(payloadData);
+        }
+
+        return data;
+    }
+
+    @Override
+    public IPacket deserialize(byte[] data, int offset, int length) {
+        final ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
+
+        bb.getInt();
+
+        this.payload = new Data();
+        this.payload = this.payload.deserialize(data, bb.position(), bb.limit()
+                - bb.position());
+        this.payload.setParent(this);
+
+        return this;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        return super.hashCode();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!super.equals(obj)) {
+            return false;
+        }
+        if (!(obj instanceof RouterSolicitation)) {
+            return false;
+        }
+        return true;
+    }
+}