[Emu] [ONOS-2603] Implement BGP Update Protocol Message and parse all Link State atrributes of Node and Prefix
Change-Id: I51f3cdbf273e7b82d1cccb21c9b2de83aba3a95d
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/link_state/BGPPrefixLSIdentifier.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/link_state/BGPPrefixLSIdentifier.java
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+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/link_state/BGPPrefixLSIdentifier.java
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+/*
+ * Copyright 2015 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.bgpio.protocol.link_state;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.Objects;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.types.BGPErrorType;
+import org.onosproject.bgpio.types.BGPValueType;
+import org.onosproject.bgpio.types.IPReachabilityInformationTlv;
+import org.onosproject.bgpio.types.OSPFRouteTypeTlv;
+import org.onosproject.bgpio.types.attr.BgpAttrNodeMultiTopologyId;
+import org.onosproject.bgpio.util.UnSupportedAttribute;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Provides Implementation of Local node descriptors and prefix descriptors.
+ */
+public class BGPPrefixLSIdentifier {
+
+ protected static final Logger log = LoggerFactory.getLogger(BGPPrefixLSIdentifier.class);
+ public static final int TYPE_AND_LEN = 4;
+ private NodeDescriptors localNodeDescriptors;
+ private LinkedList<BGPValueType> prefixDescriptor;
+
+ /**
+ * Resets parameters.
+ */
+ public BGPPrefixLSIdentifier() {
+ this.localNodeDescriptors = null;
+ this.prefixDescriptor = null;
+ }
+
+ /**
+ * Constructor to initialize parameters.
+ *
+ * @param localNodeDescriptors Local node descriptors
+ * @param prefixDescriptor Prefix Descriptors
+ */
+ public BGPPrefixLSIdentifier(NodeDescriptors localNodeDescriptors, LinkedList<BGPValueType> prefixDescriptor) {
+ this.localNodeDescriptors = localNodeDescriptors;
+ this.prefixDescriptor = prefixDescriptor;
+ }
+
+ /**
+ * Reads the channel buffer and parses Prefix Identifier.
+ *
+ * @param cb ChannelBuffer
+ * @param protocolId protocol ID
+ * @return object of this class
+ * @throws BGPParseException while parsing Prefix Identifier
+ */
+ public static BGPPrefixLSIdentifier parsePrefixIdendifier(ChannelBuffer cb, byte protocolId)
+ throws BGPParseException {
+ //Parse Local Node descriptor
+ NodeDescriptors localNodeDescriptors = new NodeDescriptors();
+ localNodeDescriptors = parseLocalNodeDescriptors(cb, protocolId);
+
+ //Parse Prefix descriptor
+ LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>();
+ prefixDescriptor = parsePrefixDescriptors(cb);
+ return new BGPPrefixLSIdentifier(localNodeDescriptors, prefixDescriptor);
+ }
+
+ /**
+ * Parse local node descriptors.
+ *
+ * @param cb ChannelBuffer
+ * @param protocolId protocol identifier
+ * @return LocalNodeDescriptors
+ * @throws BGPParseException while parsing local node descriptors
+ */
+ public static NodeDescriptors parseLocalNodeDescriptors(ChannelBuffer cb, byte protocolId)
+ throws BGPParseException {
+ ChannelBuffer tempBuf = cb;
+ short type = cb.readShort();
+ short length = cb.readShort();
+ if (cb.readableBytes() < length) {
+ //length + 4 implies data contains type, length and value
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
+ tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN));
+ }
+ NodeDescriptors localNodeDescriptors = new NodeDescriptors();
+ ChannelBuffer tempCb = cb.readBytes(length);
+
+ if (type == NodeDescriptors.LOCAL_NODE_DES_TYPE) {
+ localNodeDescriptors = NodeDescriptors.read(tempCb, length, type, protocolId);
+ } else {
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR,
+ BGPErrorType.MALFORMED_ATTRIBUTE_LIST, null);
+ }
+ return localNodeDescriptors;
+ }
+
+ /**
+ * Parse list of prefix descriptors.
+ *
+ * @param cb ChannelBuffer
+ * @return list of prefix descriptors
+ * @throws BGPParseException while parsing list of prefix descriptors
+ */
+ public static LinkedList<BGPValueType> parsePrefixDescriptors(ChannelBuffer cb) throws BGPParseException {
+ LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>();
+ BGPValueType tlv = null;
+ boolean isIpReachInfo = false;
+ ChannelBuffer tempCb;
+ int count = 0;
+
+ while (cb.readableBytes() > 0) {
+ ChannelBuffer tempBuf = cb;
+ short type = cb.readShort();
+ short length = cb.readShort();
+ if (cb.readableBytes() < length) {
+ //length + 4 implies data contains type, length and value
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
+ tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN));
+ }
+ tempCb = cb.readBytes(length);
+ switch (type) {
+ case OSPFRouteTypeTlv.TYPE:
+ tlv = OSPFRouteTypeTlv.read(tempCb);
+ break;
+ case IPReachabilityInformationTlv.TYPE:
+ tlv = IPReachabilityInformationTlv.read(tempCb, length);
+ isIpReachInfo = true;
+ break;
+ case BgpAttrNodeMultiTopologyId.ATTRNODE_MULTITOPOLOGY:
+ tlv = BgpAttrNodeMultiTopologyId.read(tempCb);
+ count = count + 1;
+ if (count > 1) {
+ //length + 4 implies data contains type, length and value
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR,
+ BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, tempBuf.readBytes(length + TYPE_AND_LEN));
+ }
+ break;
+ default:
+ UnSupportedAttribute.skipBytes(tempCb, length);
+ }
+ prefixDescriptor.add(tlv);
+ }
+
+ if (!isIpReachInfo) {
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
+ null);
+ }
+ return prefixDescriptor;
+ }
+
+ /**
+ * Returns local node descriptors.
+ *
+ * @return local node descriptors
+ */
+ public NodeDescriptors getLocalNodeDescriptors() {
+ return this.localNodeDescriptors;
+ }
+
+ /**
+ * Returns Prefix descriptors.
+ *
+ * @return Prefix descriptors
+ */
+ public LinkedList<BGPValueType> getPrefixdescriptor() {
+ return this.prefixDescriptor;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(prefixDescriptor.hashCode(), localNodeDescriptors);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+
+ if (obj instanceof BGPPrefixLSIdentifier) {
+ int countObjSubTlv = 0;
+ int countOtherSubTlv = 0;
+ boolean isCommonSubTlv = true;
+ BGPPrefixLSIdentifier other = (BGPPrefixLSIdentifier) obj;
+
+ Iterator<BGPValueType> objListIterator = other.prefixDescriptor.iterator();
+ countOtherSubTlv = other.prefixDescriptor.size();
+ countObjSubTlv = prefixDescriptor.size();
+ if (countObjSubTlv != countOtherSubTlv) {
+ return false;
+ } else {
+ while (objListIterator.hasNext() && isCommonSubTlv) {
+ BGPValueType subTlv = objListIterator.next();
+ isCommonSubTlv = Objects.equals(prefixDescriptor.contains(subTlv),
+ other.prefixDescriptor.contains(subTlv));
+ }
+ return isCommonSubTlv && Objects.equals(this.localNodeDescriptors, other.localNodeDescriptors);
+ }
+ }
+ return false;
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("localNodeDescriptors", localNodeDescriptors)
+ .add("prefixDescriptor", prefixDescriptor)
+ .toString();
+ }
+}
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