ONOS-2739 - OSPF Basic Packet Structures , which includes encoding and decoding
Change-Id: Ic37fcf98dfb6c7a15a124b495aee8517a8df23c9
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/tlvtypes/LinkTlv.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/tlvtypes/LinkTlv.java
new file mode 100644
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+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/tlvtypes/LinkTlv.java
@@ -0,0 +1,194 @@
+/*
+ * 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.lsa.tlvtypes;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.ospf.protocol.lsa.TlvHeader;
+import org.onosproject.ospf.protocol.lsa.linksubtype.AdministrativeGroup;
+import org.onosproject.ospf.protocol.lsa.linksubtype.LinkId;
+import org.onosproject.ospf.protocol.lsa.linksubtype.LinkSubType;
+import org.onosproject.ospf.protocol.lsa.linksubtype.LinkSubTypes;
+import org.onosproject.ospf.protocol.lsa.linksubtype.LinkType;
+import org.onosproject.ospf.protocol.lsa.linksubtype.LocalInterfaceIpAddress;
+import org.onosproject.ospf.protocol.lsa.linksubtype.MaximumBandwidth;
+import org.onosproject.ospf.protocol.lsa.linksubtype.MaximumReservableBandwidth;
+import org.onosproject.ospf.protocol.lsa.linksubtype.RemoteInterfaceIpAddress;
+import org.onosproject.ospf.protocol.lsa.linksubtype.TrafficEngineeringMetric;
+import org.onosproject.ospf.protocol.lsa.linksubtype.UnknownLinkSubType;
+import org.onosproject.ospf.protocol.lsa.linksubtype.UnreservedBandwidth;
+import org.onosproject.ospf.protocol.lsa.types.TopLevelTlv;
+import org.onosproject.ospf.protocol.util.OspfUtil;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Representation of an OSPF Opaque link tlv.
+ */
+public class LinkTlv extends TlvHeader implements TopLevelTlv {
+ private List<LinkSubType> subTlv = new ArrayList<>();
+
+ /**
+ * Creates an instance of link tlv.
+ *
+ * @param header tlv header
+ */
+ public LinkTlv(TlvHeader header) {
+ this.setTlvType(header.tlvType());
+ this.setTlvLength(header.tlvLength());
+ }
+
+ /**
+ * Gets sub tlv lists.
+ *
+ * @return sub tlv lists
+ */
+ public List<LinkSubType> subTlvList() {
+ return this.subTlv;
+ }
+
+ /**
+ * Reads bytes from channel buffer .
+ *
+ * @param channelBuffer channel buffer instance
+ * @throws Exception might throws exception while parsing packet
+ */
+ public void readFrom(ChannelBuffer channelBuffer) throws Exception {
+ while (channelBuffer.readableBytes() > 0) {
+ TlvHeader tlvHeader = new TlvHeader();
+ tlvHeader.setTlvType(channelBuffer.readUnsignedShort());
+ tlvHeader.setTlvLength(channelBuffer.readUnsignedShort());
+
+ if (LinkSubTypes.LINK_TYPE.value() == tlvHeader.tlvType()) {
+ LinkType linktype = new LinkType(tlvHeader);
+ linktype.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(linktype);
+ if (tlvHeader.tlvLength() < OspfUtil.FOUR_BYTES) {
+ int readerIndex = channelBuffer.readerIndex() + (OspfUtil.FOUR_BYTES - tlvHeader.tlvLength());
+ channelBuffer.readerIndex(readerIndex);
+ }
+ } else if (LinkSubTypes.LINK_ID.value() == tlvHeader.tlvType()) {
+ LinkId linkId = new LinkId(tlvHeader);
+ linkId.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(linkId);
+ } else if (LinkSubTypes.LOCAL_INTERFACE_IP_ADDRESS.value() == tlvHeader.tlvType()) {
+ LocalInterfaceIpAddress localInterfaceIpAddress = new LocalInterfaceIpAddress(tlvHeader);
+ localInterfaceIpAddress.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(localInterfaceIpAddress);
+ } else if (LinkSubTypes.REMOTE_INTERFACE_IP_ADDRESS.value() == tlvHeader.tlvType()) {
+ RemoteInterfaceIpAddress remoteInterfaceIpAddress = new RemoteInterfaceIpAddress(tlvHeader);
+ remoteInterfaceIpAddress.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(remoteInterfaceIpAddress);
+ } else if (LinkSubTypes.TRAFFIC_ENGINEERING_METRIC.value() == tlvHeader.tlvType()) {
+ TrafficEngineeringMetric trafficEngineeringMetric = new TrafficEngineeringMetric(tlvHeader);
+ trafficEngineeringMetric.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(trafficEngineeringMetric);
+ } else if (LinkSubTypes.MAXIMUM_BANDWIDTH.value() == tlvHeader.tlvType()) {
+ MaximumBandwidth maximumBandwidth = new MaximumBandwidth(tlvHeader);
+ maximumBandwidth.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(maximumBandwidth);
+ } else if (LinkSubTypes.MAXIMUM_RESERVABLE_BANDWIDTH.value() == tlvHeader.tlvType()) {
+ MaximumReservableBandwidth maximumReservableBandwidth = new MaximumReservableBandwidth(tlvHeader);
+ maximumReservableBandwidth.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(maximumReservableBandwidth);
+ } else if (LinkSubTypes.UNRESERVED_BANDWIDTH.value() == tlvHeader.tlvType()) {
+ UnreservedBandwidth unreservedBandwidth = new UnreservedBandwidth(tlvHeader);
+ unreservedBandwidth.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(unreservedBandwidth);
+ } else if (LinkSubTypes.ADMINISTRATIVE_GROUP.value() == tlvHeader.tlvType()) {
+ AdministrativeGroup administrativeGroup = new AdministrativeGroup(tlvHeader);
+ administrativeGroup.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(administrativeGroup);
+ } else {
+ UnknownLinkSubType unknownLinkSubType = new UnknownLinkSubType(tlvHeader);
+ unknownLinkSubType.readFrom(channelBuffer.readBytes(tlvHeader.tlvLength()));
+ subTlv.add(unknownLinkSubType);
+ }
+ }
+ }
+
+ /**
+ * Gets link tlv as byte array.
+ *
+ * @return link tlv as byte array
+ * @throws Exception might throws exception while parsing buffer
+ */
+ public byte[] asBytes() throws Exception {
+ byte[] lsaMessage = null;
+
+ byte[] tlvHeader = getTlvHeaderAsByteArray();
+ byte[] tlvBody = getTlvBodyAsByteArray();
+ lsaMessage = Bytes.concat(tlvHeader, tlvBody);
+
+ return lsaMessage;
+ }
+
+ /**
+ * Gets tlv body as byte array.
+ *
+ * @return tlv body as byte array
+ * @throws Exception might throws exception while parsing buffer
+ */
+ public byte[] getTlvBodyAsByteArray() throws Exception {
+
+ List<Byte> bodyLst = new ArrayList<>();
+ for (LinkSubType tlv : subTlv) {
+ //Check the type of tlv and build bytes accordingly
+ if (tlv instanceof LinkType) {
+ LinkType linkType = (LinkType) tlv;
+ bodyLst.addAll(Bytes.asList(linkType.asBytes()));
+ } else if (tlv instanceof LinkId) {
+ LinkId linkId = (LinkId) tlv;
+ bodyLst.addAll(Bytes.asList(linkId.asBytes()));
+ } else if (tlv instanceof LocalInterfaceIpAddress) {
+ LocalInterfaceIpAddress localInterfaceIpAddress = (LocalInterfaceIpAddress) tlv;
+ bodyLst.addAll(Bytes.asList(localInterfaceIpAddress.asBytes()));
+ } else if (tlv instanceof RemoteInterfaceIpAddress) {
+ RemoteInterfaceIpAddress remoteInterfaceIpAddress = (RemoteInterfaceIpAddress) tlv;
+ bodyLst.addAll(Bytes.asList(remoteInterfaceIpAddress.asBytes()));
+ } else if (tlv instanceof TrafficEngineeringMetric) {
+ TrafficEngineeringMetric trafficEngineeringMetric = (TrafficEngineeringMetric) tlv;
+ bodyLst.addAll(Bytes.asList(trafficEngineeringMetric.asBytes()));
+ } else if (tlv instanceof MaximumBandwidth) {
+ MaximumBandwidth maximumBandwidth = (MaximumBandwidth) tlv;
+ bodyLst.addAll(Bytes.asList(maximumBandwidth.asBytes()));
+ } else if (tlv instanceof MaximumReservableBandwidth) {
+ MaximumReservableBandwidth maximumReservableBandwidth = (MaximumReservableBandwidth) tlv;
+ bodyLst.addAll(Bytes.asList(maximumReservableBandwidth.asBytes()));
+ } else if (tlv instanceof UnreservedBandwidth) {
+ UnreservedBandwidth unreservedBandwidth = (UnreservedBandwidth) tlv;
+ bodyLst.addAll(Bytes.asList(unreservedBandwidth.asBytes()));
+ } else if (tlv instanceof AdministrativeGroup) {
+ AdministrativeGroup administrativeGroup = (AdministrativeGroup) tlv;
+ bodyLst.addAll(Bytes.asList(administrativeGroup.asBytes()));
+ } else {
+ UnknownLinkSubType unknownLinkSubType = (UnknownLinkSubType) tlv;
+ bodyLst.addAll(Bytes.asList(unknownLinkSubType.asBytes()));
+ }
+ }
+ return Bytes.toArray(bodyLst);
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .omitNullValues()
+ .add("subTlv", subTlv)
+ .toString();
+ }
+}
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