ONOS-2739 - OSPF Basic Packet Structures , which includes encoding and decoding

Change-Id: I33b48593ec38d28bdff215ce3a608a6d085a9077

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.subtype;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Representation of an LS Request packet and fields and access methods to access it.
+ */
+public class LsRequestPacket {
+
+    private int lsType;
+    private String linkStateId;
+    private String ownRouterId;
+
+    /**
+     * Gets the LSA type.
+     *
+     * @return LSA type
+     */
+    public int lsType() {
+        return lsType;
+    }
+
+    /**
+     * Sets the LSA type.
+     *
+     * @param lsType LSA type
+     */
+    public void setLsType(int lsType) {
+        this.lsType = lsType;
+    }
+
+    /**
+     * Gets the link state id.
+     *
+     * @return link state id
+     */
+    public String linkStateId() {
+        return linkStateId;
+    }
+
+    /**
+     * Sets link state id.
+     *
+     * @param linkStateId state id
+     */
+    public void setLinkStateId(String linkStateId) {
+        this.linkStateId = linkStateId;
+    }
+
+    /**
+     * Gets the router id.
+     *
+     * @return router id
+     */
+    public String ownRouterId() {
+        return ownRouterId;
+    }
+
+    /**
+     * Sets the router id.
+     *
+     * @param ownRouterId router id
+     */
+    public void setOwnRouterId(String ownRouterId) {
+        this.ownRouterId = ownRouterId;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("lsType", lsType)
+                .add("linkStateId", linkStateId)
+                .add("ownRouterId", ownRouterId)
+                .toString();
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2016 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.
+ */
+
+/**
+ * Implementation of the OSPF packet sub types which is used in OSPF packets..
+ */
+package org.onosproject.ospf.protocol.ospfpacket.subtype;
\ No newline at end of file

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.ospf.exceptions.OspfErrorType;
+import org.onosproject.ospf.exceptions.OspfParseException;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+import org.onosproject.ospf.protocol.lsa.OpaqueLsaHeader;
+import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader;
+import org.onosproject.ospf.protocol.util.OspfPacketType;
+import org.onosproject.ospf.protocol.util.OspfParameters;
+import org.onosproject.ospf.protocol.util.OspfUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Representation of an  OSPF Link State Acknowledgment Message.
+ * Link State Acknowledgment Packets are OSPF packet type 5.
+ * To make the flooding of LSAs reliable, flooded LSAs are explicitly
+ * acknowledged. This acknowledgment is accomplished through the
+ * sending and receiving of Link State Acknowledgment packets.
+ * Multiple LSAs can be acknowledged in a single Link State Acknowledgment packet.
+ */
+public class LsAcknowledge extends OspfPacketHeader {
+    /*
+        0                   1                   2                   3
+        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |   Version #   |       5       |         Packet length         |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                          Router ID                            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                           Area ID                             |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |           Checksum            |             AuType            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                       Authentication                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                       Authentication                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-                         An LSA Header                       -+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                              ...                              |
+ */
+    private static final Logger log = LoggerFactory.getLogger(LsAcknowledge.class);
+    private List<LsaHeader> linkStateHeaders = new ArrayList<>();
+
+    /**
+     * Creates an instance of Link State Acknowledgment instance.
+     */
+    public LsAcknowledge() {
+    }
+
+    /**
+     * Creates an instance of Link State Acknowledgment instance.
+     *
+     * @param ospfHeader OSPF header instance.
+     */
+    public LsAcknowledge(OspfPacketHeader ospfHeader) {
+        populateHeader(ospfHeader);
+    }
+
+    /**
+     * Gets ls headers.
+     *
+     * @return ls headers
+     */
+    public List<LsaHeader> getLinkStateHeaders() {
+        return linkStateHeaders;
+    }
+
+    /**
+     * Adds link state header to list.
+     *
+     * @param lsaHeader LSA header
+     */
+    public void addLinkStateHeader(LsaHeader lsaHeader) {
+        if (!linkStateHeaders.contains(lsaHeader)) {
+            linkStateHeaders.add(lsaHeader);
+        }
+    }
+
+    @Override
+    public OspfPacketType ospfMessageType() {
+        return OspfPacketType.LSAACK;
+    }
+
+    @Override
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+        try {
+            //add all the LSA Headers - one header is of 20 bytes
+            while (channelBuffer.readableBytes() >= OspfUtil.LSA_HEADER_LENGTH) {
+                LsaHeader header = OspfUtil.readLsaHeader(channelBuffer);
+                //add the LSAHeader to acknowledge
+                addLinkStateHeader(header);
+            }
+
+        } catch (Exception e) {
+            log.debug("Error::LsAckPacket:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.MESSAGE_HEADER_ERROR, OspfErrorType.BAD_MESSAGE_LENGTH);
+        }
+    }
+
+    @Override
+    public byte[] asBytes() {
+        byte[] lsAckMessage = null;
+
+        byte[] lsAckHeader = getLsAckAsByteArray();
+        byte[] lsAckBody = getLsAckBodyAsByteArray();
+        lsAckMessage = Bytes.concat(lsAckHeader, lsAckBody);
+
+        return lsAckMessage;
+    }
+
+    /**
+     * Gets LSAcknowledge as byte array.
+     *
+     * @return byte array
+     */
+    public byte[] getLsAckAsByteArray() {
+        List<Byte> headerLst = new ArrayList<>();
+        try {
+            headerLst.add((byte) this.ospfVersion());
+            headerLst.add((byte) this.ospfType());
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.ospfPacLength())));
+            headerLst.addAll(Bytes.asList(this.routerId().toOctets()));
+            headerLst.addAll(Bytes.asList(this.areaId().toOctets()));
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.checksum())));
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.authType())));
+            //Authentication is 0 always. Total 8 bytes consist of zero
+            byte[] auth = new byte[OspfUtil.EIGHT_BYTES];
+            headerLst.addAll(Bytes.asList(auth));
+        } catch (Exception e) {
+            log.debug("Error::LsAckPacket:: {}", e.getMessage());
+            return Bytes.toArray(headerLst);
+        }
+
+        return Bytes.toArray(headerLst);
+    }
+
+    /**
+     * Gets LsAck body as byte array.
+     *
+     * @return byte array
+     */
+    public byte[] getLsAckBodyAsByteArray() {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            for (LsaHeader lsaHeader : linkStateHeaders) {
+                if (lsaHeader.lsType() == OspfParameters.LINK_LOCAL_OPAQUE_LSA ||
+                        lsaHeader.lsType() == OspfParameters.AREA_LOCAL_OPAQUE_LSA ||
+                        lsaHeader.lsType() == OspfParameters.AS_OPAQUE_LSA) {
+                    OpaqueLsaHeader header = (OpaqueLsaHeader) lsaHeader;
+                    bodyLst.addAll(Bytes.asList(header.getOpaqueLsaHeaderAsByteArray()));
+                } else {
+                    bodyLst.addAll(Bytes.asList(lsaHeader.getLsaHeaderAsByteArray()));
+                }
+            }
+        } catch (Exception e) {
+            log.debug("Error::getLsAckBodyAsByteArray {}", e.getMessage());
+            return Bytes.toArray(bodyLst);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("linkStateHeaders", linkStateHeaders)
+                .toString();
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2016 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.ospf.protocol.util;
+
+/**
+ * Representation of different OSPF packet types.
+ */
+public enum OspfPacketType {
+
+    HELLO(1),
+    DD(2),
+    LSREQUEST(3),
+    LSUPDATE(4),
+    LSAACK(5);
+
+    private int value;
+
+    /**
+     * Creates instance of OSPF packet types.
+     *
+     * @param value
+     */
+    OspfPacketType(int value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the value.
+     *
+     * @return value
+     */
+    public int value() {
+        return value;
+    }
+}
\ No newline at end of file

+/*
+ * 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.
+ */
+
+/**
+ * Implementation of the OSPF Packet.
+ */
+package org.onosproject.ospf.protocol.ospfpacket.types;

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.subtype;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * Unit test class for LsRequestPacket.
+ */
+public class LsRequestPacketTest {
+
+    private LsRequestPacket lsrPacket;
+    private int result;
+
+    @Before
+    public void setUp() throws Exception {
+        lsrPacket = new LsRequestPacket();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        lsrPacket = null;
+    }
+
+    /**
+     * Tests lsType() getter method.
+     */
+    @Test
+    public void testGetLsType() throws Exception {
+        lsrPacket.setLsType(1);
+        assertThat(lsrPacket.lsType(), is(1));
+    }
+
+    /**
+     * Tests lsType() setter method.
+     */
+    @Test
+    public void testSetLsType() throws Exception {
+        lsrPacket.setLsType(1);
+        assertThat(lsrPacket.lsType(), is(1));
+    }
+
+    /**
+     * Tests linkStateId() getter method.
+     */
+    @Test
+    public void testGetLinkStateId() throws Exception {
+        lsrPacket.setLinkStateId("1.1.1.1");
+        assertThat(lsrPacket.linkStateId(), is("1.1.1.1"));
+    }
+
+    /**
+     * Tests linkStateId() setter method.
+     */
+    @Test
+    public void testSetLinkStateId() throws Exception {
+        lsrPacket.setLinkStateId("1.1.1.1");
+        assertThat(lsrPacket.linkStateId(), is("1.1.1.1"));
+    }
+
+    /**
+     * Tests ownRouterId() getter method.
+     */
+    @Test
+    public void testGetOwnRouterId() throws Exception {
+        lsrPacket.setOwnRouterId("1.1.1.1");
+        assertThat(lsrPacket.ownRouterId(), is("1.1.1.1"));
+    }
+
+    /**
+     * Tests ownRouterId() setter method.
+     */
+    @Test
+    public void testSetOwnRouterId() throws Exception {
+        lsrPacket.setOwnRouterId("1.1.1.1");
+        assertThat(lsrPacket.ownRouterId(), is("1.1.1.1"));
+    }
+
+    /**
+     * Tests to string method.
+     */
+    @Test
+    public void testToString() throws Exception {
+        assertThat(lsrPacket.toString(), is(notNullValue()));
+    }
+
+    /**
+     * Tests equals() method.
+     */
+    @Test
+    public void testEquals() throws Exception {
+        assertThat(lsrPacket.equals(new LsRequestPacket()), is(false));
+    }
+
+    /**
+     * Tests hashCode() method.
+     */
+    @Test
+    public void testHashCode() throws Exception {
+        result = lsrPacket.hashCode();
+        assertThat(result, is(notNullValue()));
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader;
+import org.onosproject.ospf.protocol.util.OspfPacketType;
+
+import java.util.Vector;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Unit test class for HelloPacket.
+ */
+public class HelloPacketTest {
+
+    private boolean result1;
+    private OspfPacketType ospfPacketType;
+    private OspfPacketHeader ospfPacketHeader;
+    private HelloPacket helloPacket;
+    private Vector<String> neighborAddress = new Vector();
+    private Ip4Address result;
+    private int result2;
+    private byte[] packet;
+    private ChannelBuffer channelBuffer;
+    private byte[] result3;
+
+    @Before
+    public void setUp() throws Exception {
+        helloPacket = new HelloPacket();
+        helloPacket.setAuthType(1);
+        helloPacket.setOspftype(2);
+        helloPacket.setRouterId(Ip4Address.valueOf("10.226.165.164"));
+        helloPacket.setAreaId(Ip4Address.valueOf("10.226.165.100"));
+        helloPacket.setChecksum(201);
+        helloPacket.setAuthentication(2);
+        helloPacket.setOspfPacLength(48);
+        helloPacket.setOspfVer(2);
+
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        helloPacket = null;
+        result = null;
+        ospfPacketType = null;
+        ospfPacketHeader = null;
+        packet = null;
+        channelBuffer = null;
+        result3 = null;
+    }
+
+    /**
+     * Tests networkMask() getter method.
+     */
+    @Test
+    public void testGetNetworkMask() throws Exception {
+        helloPacket.setNetworkMask(Ip4Address.valueOf("10.226.165.164"));
+        result = helloPacket.networkMask();
+        assertThat(result, is(notNullValue()));
+        assertThat(result, is(Ip4Address.valueOf("10.226.165.164")));
+    }
+
+    /**
+     * Tests networkMask() setter method.
+     */
+    @Test
+    public void testSetNetworkMask() throws Exception {
+        helloPacket.setNetworkMask(Ip4Address.valueOf("10.226.165.164"));
+        result = helloPacket.networkMask();
+        assertThat(result, is(notNullValue()));
+        assertThat(result, is(Ip4Address.valueOf("10.226.165.164")));
+    }
+
+    /**
+     * Tests bdr() setter method.
+     */
+    @Test
+    public void testSetBdr() throws Exception {
+        helloPacket.setBdr(Ip4Address.valueOf("10.226.165.166"));
+        result = helloPacket.bdr();
+        assertThat(result, is(notNullValue()));
+        assertThat(result, is(Ip4Address.valueOf("10.226.165.166")));
+    }
+
+    /**
+     * Tests dr() getter method.
+     */
+    @Test
+    public void testGetDr() throws Exception {
+        helloPacket.setDr(Ip4Address.valueOf("10.226.165.167"));
+        result = helloPacket.dr();
+        assertThat(result, is(notNullValue()));
+        assertThat(result, is(Ip4Address.valueOf("10.226.165.167")));
+    }
+
+    /**
+     * Tests dr() setter method.
+     */
+    @Test
+    public void testSetDr() throws Exception {
+        helloPacket.setDr(Ip4Address.valueOf("10.226.165.167"));
+        result = helloPacket.dr();
+        assertThat(result, is(notNullValue()));
+        assertThat(result, is(Ip4Address.valueOf("10.226.165.167")));
+    }
+
+    /**
+     * Tests addNeighbor() method.
+     */
+    @Test
+    public void testAddNeighbor() throws Exception {
+        helloPacket.addNeighbor(Ip4Address.valueOf("10.226.165.170"));
+        result1 = helloPacket.containsNeighbour(Ip4Address.valueOf("10.226.165.170"));
+        assertThat(result1, is(true));
+    }
+
+    /**
+     * Tests containsNeighbour() method.
+     */
+    @Test
+    public void testContainsNeighbour() throws Exception {
+        helloPacket.addNeighbor(Ip4Address.valueOf("10.226.165.200"));
+        result1 = helloPacket.containsNeighbour(Ip4Address.valueOf("10.226.165.200"));
+        assertThat(result1, is(true));
+    }
+
+
+    /**
+     * Tests options() getter  method.
+     */
+    @Test
+    public void testGetOptions() throws Exception {
+        helloPacket.setOptions(10);
+        result2 = helloPacket.options();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(10));
+    }
+
+    /**
+     * Tests options() setter  method.
+     */
+    @Test
+    public void testSetOptions() throws Exception {
+        helloPacket.setOptions(11);
+        result2 = helloPacket.options();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(11));
+    }
+
+    /**
+     * Tests routerPriority() getter  method.
+     */
+    @Test
+    public void testGetRouterPriority() throws Exception {
+        helloPacket.setRouterPriority(1);
+        result2 = helloPacket.routerPriority();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(1));
+    }
+
+    /**
+     * Tests routerPriority() setter  method.
+     */
+    @Test
+    public void testSetRouterPriority() throws Exception {
+        helloPacket.setRouterPriority(2);
+        result2 = helloPacket.routerPriority();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(2));
+    }
+
+    /**
+     * Tests helloInterval() getter  method.
+     */
+    @Test
+    public void testGetHelloInterval() throws Exception {
+        helloPacket.setHelloInterval(10);
+        result2 = helloPacket.helloInterval();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(10));
+    }
+
+    /**
+     * Tests helloInterval() setter  method.
+     */
+    @Test
+    public void testSetHelloInterval() throws Exception {
+        helloPacket.setHelloInterval(10);
+        result2 = helloPacket.helloInterval();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(10));
+    }
+
+    /**
+     * Tests routerDeadInterval() getter  method.
+     */
+    @Test
+    public void testGetRouterDeadInterval() throws Exception {
+        helloPacket.setRouterDeadInterval(50);
+        result2 = helloPacket.routerDeadInterval();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(50));
+    }
+
+    /**
+     * Tests routerDeadInterval() setter  method.
+     */
+    @Test
+    public void testSetRouterDeadInterval() throws Exception {
+        helloPacket.setRouterDeadInterval(50);
+        result2 = helloPacket.routerDeadInterval();
+        assertThat(result2, is(notNullValue()));
+        assertThat(result2, is(50));
+    }
+
+    /**
+     * Tests ospfMessageType() getter  method.
+     */
+    @Test
+    public void testGetOspfMessageType() throws Exception {
+        ospfPacketType = helloPacket.ospfMessageType();
+        assertThat(ospfPacketType, is(notNullValue()));
+        assertThat(ospfPacketType, is(OspfPacketType.HELLO));
+    }
+
+    /**
+     * Tests readFrom() method.
+     */
+    @Test
+    public void testReadFrom() throws Exception {
+        ospfPacketHeader = new OspfPacketHeader();
+        ospfPacketHeader.setAreaId(Ip4Address.valueOf("1.1.1.1"));
+        ospfPacketHeader.setAuthentication(0);
+        ospfPacketHeader.setAuthType(0);
+        ospfPacketHeader.setChecksum(12345);
+        ospfPacketHeader.setDestinationIp(Ip4Address.valueOf("10.10.10.10"));
+        ospfPacketHeader.setOspfPacLength(56);
+        ospfPacketHeader.setOspftype(1);
+        ospfPacketHeader.setOspfVer(2);
+        ospfPacketHeader.setRouterId(Ip4Address.valueOf("2.2.2.2"));
+        ospfPacketHeader.setSourceIp(Ip4Address.valueOf("3.3.3.3"));
+        packet = createByteForHelloPacket();
+        channelBuffer = ChannelBuffers.copiedBuffer(packet);
+        helloPacket.readFrom(channelBuffer);
+        assertThat(helloPacket, is(notNullValue()));
+        assertThat(helloPacket.ospfMessageType(), is(OspfPacketType.HELLO));
+    }
+
+    /**
+     * Tests asBytes() method.
+     */
+    @Test
+    public void testAsBytes() throws Exception {
+        result3 = helloPacket.asBytes();
+        assertThat(result3, is(notNullValue()));
+    }
+
+    /**
+     * Tests getHelloHeaderAsByteArray() method.
+     */
+    @Test
+    public void testGetHelloHeaderAsByteArray() throws Exception {
+        result3 = helloPacket.getHelloHeaderAsByteArray();
+        assertThat(result3, is(notNullValue()));
+    }
+
+    /**
+     * Tests getHelloBodyAsByteArray() method.
+     */
+    @Test
+    public void testGetHelloBodyAsByteArray() throws Exception {
+        neighborAddress.add("10.226.165.100");
+        result3 = helloPacket.getHelloBodyAsByteArray();
+        assertThat(result3, is(notNullValue()));
+    }
+
+    /**
+     * Tests getHelloBodyAsByteArray() method.
+     */
+    @Test
+    public void testReadHelloBody() throws Exception {
+        helloPacket.getHelloBodyAsByteArray();
+        assertThat(helloPacket, is(notNullValue()));
+    }
+
+    /**
+     * Tests to string method.
+     */
+    @Test
+    public void testToString() throws Exception {
+        assertThat(helloPacket.toString(), is(notNullValue()));
+    }
+
+    /**
+     * Utility method used by junit methods.
+     */
+    private byte[] createByteForHelloPacket() {
+        byte[] helloPacket = {2, 1, 0, 44, -64, -88, -86, 8, 0, 0, 0, 1, 39, 59, 0, 0, 0, 0,
+                0, 0, 0, 0, 0, 0, -1, -1, -1, 0, 0, 10, 2, 1, 0, 0, 0, 40, -64, -88, -86, 8, 0, 0, 0, 0};
+
+        return helloPacket;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.types;
+
+import org.hamcrest.MatcherAssert;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+import org.onosproject.ospf.protocol.lsa.OpaqueLsaHeader;
+import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader;
+import org.onosproject.ospf.protocol.util.OspfPacketType;
+
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Unit test class for LsAck.
+ */
+public class LsAcknowledgeTest {
+
+    private LsaHeader lsaHeader;
+    private LsAcknowledge lsAck;
+    private OspfPacketType ospfPacketType;
+    private OspfPacketHeader ospfPacketHeader;
+    private byte[] result;
+    private ChannelBuffer channelBuffer;
+    private OpaqueLsaHeader opaqueLsaHeader;
+
+    @Before
+    public void setUp() throws Exception {
+        lsaHeader = new LsaHeader();
+        lsAck = new LsAcknowledge();
+        lsAck.setAuthType(1);
+        lsAck.setOspftype(5);
+        lsAck.setRouterId(Ip4Address.valueOf("10.226.165.164"));
+        lsAck.setAreaId(Ip4Address.valueOf("10.226.165.100"));
+        lsAck.setChecksum(201);
+        lsAck.setAuthentication(2);
+        lsAck.setOspfPacLength(48);
+        lsAck.setOspfVer(2);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        lsaHeader = null;
+        lsAck = null;
+        ospfPacketType = null;
+        ospfPacketHeader = null;
+        result = null;
+        channelBuffer = null;
+        opaqueLsaHeader = null;
+    }
+
+    /**
+     * Tests getLinkStateHeaders() getter method.
+     */
+    @Test
+    public void testGetLinkStateHeaders() throws Exception {
+        lsaHeader = createLsaHeader();
+        lsAck.addLinkStateHeader(lsaHeader);
+        lsAck.addLinkStateHeader(lsaHeader);
+        List headers = lsAck.getLinkStateHeaders();
+        assertThat(headers.size(), is(1));
+
+    }
+
+    /**
+     * Tests addLinkStateHeader() method.
+     */
+    @Test
+    public void testAddLinkStateHeader() throws Exception {
+        lsaHeader = createLsaHeader();
+        lsAck.addLinkStateHeader(lsaHeader);
+        lsAck.addLinkStateHeader(lsaHeader);
+        assertThat(lsAck, is(notNullValue()));
+    }
+
+
+    /**
+     * Tests ospfMessageType() getter method.
+     */
+    @Test
+    public void testGetOSPFMessageType() throws Exception {
+        ospfPacketType = lsAck.ospfMessageType();
+        assertThat(ospfPacketType, is(notNullValue()));
+        assertThat(ospfPacketType, is(OspfPacketType.LSAACK));
+    }
+
+    /**
+     * Tests ospfMessageType() getter method.
+     */
+    @Test
+    public void testGetOspfMessageType() throws Exception {
+        ospfPacketType = lsAck.ospfMessageType();
+        assertThat(ospfPacketType, is(notNullValue()));
+        assertThat(ospfPacketType, is(OspfPacketType.LSAACK));
+    }
+
+    /**
+     * Tests readFrom() method.
+     */
+    @Test
+    public void testReadFrom() throws Exception {
+        ospfPacketHeader = new OspfPacketHeader();
+        ospfPacketHeader.setAreaId(Ip4Address.valueOf("1.1.1.1"));
+        ospfPacketHeader.setAuthentication(0);
+        ospfPacketHeader.setAuthType(0);
+        ospfPacketHeader.setChecksum(12345);
+        ospfPacketHeader.setDestinationIp(Ip4Address.valueOf("10.10.10.10"));
+        ospfPacketHeader.setOspfPacLength(56);
+        ospfPacketHeader.setOspftype(5);
+        ospfPacketHeader.setOspfVer(2);
+        ospfPacketHeader.setRouterId(Ip4Address.valueOf("2.2.2.2"));
+        ospfPacketHeader.setSourceIp(Ip4Address.valueOf("3.3.3.3"));
+        result = createByteForLSAck();
+        lsAck = new LsAcknowledge(ospfPacketHeader);
+        channelBuffer = ChannelBuffers.copiedBuffer(result);
+        lsAck.readFrom(channelBuffer);
+        assertThat(lsAck, is(notNullValue()));
+        assertThat(lsAck.ospfMessageType(), is(OspfPacketType.LSAACK));
+    }
+
+    /**
+     * Tests asBytes() method.
+     */
+    @Test
+    public void testAsBytes() throws Exception {
+        result = lsAck.asBytes();
+        assertThat(result, is(notNullValue()));
+    }
+
+    /**
+     * Tests getLsAckAsByteArray() method.
+     */
+    @Test
+    public void testGetLsAckAsByteArray() throws Exception {
+        result = lsAck.getLsAckAsByteArray();
+        assertThat(result, is(notNullValue()));
+    }
+
+    /**
+     * Tests getLsAckBodyAsByteArray() method.
+     */
+    @Test
+    public void testGetLsAckBodyAsByteArray() throws Exception {
+        lsaHeader = createLsaHeader();
+        opaqueLsaHeader = new OpaqueLsaHeader();
+        lsAck.addLinkStateHeader(lsaHeader);
+        lsAck.addLinkStateHeader(opaqueLsaHeader);
+        result = lsAck.getLsAckBodyAsByteArray();
+        assertThat(result, is(notNullValue()));
+    }
+
+    /**
+     * Tests to string method.
+     */
+    @Test
+    public void testToString() throws Exception {
+        MatcherAssert.assertThat(lsAck.toString(), is(notNullValue()));
+    }
+
+    /**
+     * Utility method used by junit methods.
+     */
+    private LsaHeader createLsaHeader() {
+        lsaHeader = new LsaHeader();
+        lsaHeader.setAge(10);
+        lsaHeader.setLinkStateId("10.226.165.164");
+        lsaHeader.setLsCheckSum(222);
+        lsaHeader.setLsPacketLen(48);
+        lsaHeader.setLsSequenceNo(2020);
+        lsaHeader.setLsType(5);
+        lsaHeader.setOptions(2);
+        lsaHeader.setAdvertisingRouter(Ip4Address.valueOf("10.226.165.165"));
+        return lsaHeader;
+    }
+
+    /**
+     * Utility method used by junit methods.
+     */
+    private byte[] createByteForLSAck() {
+        byte[] lsAckPacket = {2, 5, 0, 44, -64, -88, -86, 8, 0, 0, 0, 1, -30,
+                -12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 16, 2, 1, -64, -88, -86,
+                2, -64, -88, -86, 2, -128, 0, 0, 1, 74, -114, 0, 48};
+
+        return lsAckPacket;
+    }
+}
\ No newline at end of file

+/*
+ * Copyright 2016 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.ospf.protocol.ospfpacket.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader;
+import org.onosproject.ospf.protocol.ospfpacket.subtype.LsRequestPacket;
+import org.onosproject.ospf.protocol.util.OspfPacketType;
+
+import java.net.UnknownHostException;
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Unit test class for LsRequest.
+ */
+public class LsRequestTest {
+
+    private LsRequest lsRequest;
+    private List<LsRequestPacket> result;
+    private OspfPacketType ospfMessageType;
+    private OspfPacketHeader ospfPacketHeader;
+    private byte[] result1;
+    private String result2;
+    private ChannelBuffer channelBuffer;
+    private LsRequestPacket lsRequestPacket;
+
+    @Before
+    public void setUp() throws Exception {
+        lsRequest = new LsRequest();
+        lsRequest.setAuthType(1);
+        lsRequest.setOspftype(3);
+        lsRequest.setRouterId(Ip4Address.valueOf("10.226.165.164"));
+        lsRequest.setAreaId(Ip4Address.valueOf("10.226.165.163"));
+        lsRequest.setChecksum(201);
+        lsRequest.setAuthentication(2);
+        lsRequest.setOspfPacLength(48);
+        lsRequest.setOspfVer(2);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        lsRequest = null;
+        result = null;
+        ospfMessageType = null;
+        ospfPacketHeader = null;
+        result1 = null;
+        channelBuffer = null;
+        lsRequestPacket = null;
+    }
+
+    /**
+     * Tests addLinkStateRequests() method.
+     */
+    @Test
+    public void testAddLinkStateRequests() throws Exception {
+        lsRequest.addLinkStateRequests(createLsRequestPacket());
+        result = lsRequest.getLinkStateRequests();
+        assertThat(result, is(notNullValue()));
+        assertThat(result.size(), is(1));
+    }
+
+    /**
+     * Tests getLinkStateRequests() method.
+     */
+    @Test
+    public void testGetLinkStateRequests() throws Exception {
+        lsRequest.addLinkStateRequests(createLsRequestPacket());
+        lsRequest.addLinkStateRequests(new LsRequestPacket());
+        result = lsRequest.getLinkStateRequests();
+        assertThat(result, is(notNullValue()));
+        assertThat(result.size(), is(2));
+    }
+
+    /**
+     * Tests ospfMessageType()getter  method.
+     */
+    @Test
+    public void testGetOspfMessageType() throws Exception {
+        ospfMessageType = lsRequest.ospfMessageType();
+        assertThat(ospfMessageType, is(notNullValue()));
+        assertThat(ospfMessageType, is(OspfPacketType.LSREQUEST));
+    }
+
+    /**
+     * Tests readFrom() method.
+     */
+    @Test
+    public void testReadFrom() throws Exception {
+        ospfPacketHeader = new OspfPacketHeader();
+        ospfPacketHeader.setAreaId(Ip4Address.valueOf("1.1.1.1"));
+        ospfPacketHeader.setAuthentication(0);
+        ospfPacketHeader.setAuthType(0);
+        ospfPacketHeader.setChecksum(12345);
+        ospfPacketHeader.setDestinationIp(Ip4Address.valueOf("10.10.10.10"));
+        ospfPacketHeader.setOspfPacLength(56);
+        ospfPacketHeader.setOspftype(3);
+        ospfPacketHeader.setOspfVer(2);
+        ospfPacketHeader.setRouterId(Ip4Address.valueOf("2.2.2.2"));
+        ospfPacketHeader.setSourceIp(Ip4Address.valueOf("3.3.3.3"));
+        lsRequest = new LsRequest(ospfPacketHeader);
+        result1 = createByteLsReqestPacket();
+        channelBuffer = ChannelBuffers.copiedBuffer(result1);
+        lsRequest.readFrom(channelBuffer);
+        assertThat(lsRequest, is(notNullValue()));
+        assertThat(lsRequest.ospfMessageType(), is(OspfPacketType.LSREQUEST));
+    }
+
+    /**
+     * Tests asBytes() method.
+     */
+    @Test
+    public void testAsBytes() throws Exception {
+        result1 = lsRequest.asBytes();
+        assertThat(result1, is(notNullValue()));
+    }
+
+    /**
+     * Tests getLsrHeaderAsByteArray() method.
+     */
+    @Test
+    public void testGetLsrHeaderAsByteArray() throws Exception {
+        result1 = lsRequest.getLsrHeaderAsByteArray();
+        assertThat(result1, is(notNullValue()));
+    }
+
+    /**
+     * Tests getLsrBodyAsByteArray() method.
+     */
+    @Test
+    public void testGetLsrBodyAsByteArray() throws Exception {
+        lsRequest.addLinkStateRequests(createLsRequestPacket());
+        lsRequest.addLinkStateRequests(new LsRequestPacket());
+        result1 = lsRequest.getLsrBodyAsByteArray();
+        assertThat(result1, is(notNullValue()));
+    }
+
+    /**
+     * Tests to string method.
+     */
+    @Test
+    public void testToString() throws Exception {
+        result2 = lsRequest.toString();
+        assertThat(result2, is(notNullValue()));
+    }
+
+    private LsRequestPacket createLsRequestPacket() throws UnknownHostException {
+        lsRequestPacket = new LsRequestPacket();
+        lsRequestPacket.setOwnRouterId("165");
+        lsRequestPacket.setLinkStateId("10.226.165.164");
+        lsRequestPacket.setLsType(2);
+        return lsRequestPacket;
+    }
+
+    private byte[] createByteLsReqestPacket() {
+        byte[] lsRequestPacket = {2, 3, 0, 36, -64, -88, -86, 3, 0, 0, 0, 1, -67,
+                -57, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -64, -88, -86, 8,
+                -64, -88, -86, 8};
+        return lsRequestPacket;
+    }
+}
\ No newline at end of file