2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.bgp.linkstate.attribute;
10 import com.google.common.base.Preconditions;
11 import com.google.common.collect.HashMultimap;
12 import com.google.common.collect.Multimap;
13 import io.netty.buffer.ByteBuf;
14 import io.netty.buffer.Unpooled;
15 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
16 import org.opendaylight.protocol.bgp.parser.spi.AttributeParser;
17 import org.opendaylight.protocol.bgp.parser.spi.AttributeSerializer;
18 import org.opendaylight.protocol.bgp.parser.spi.AttributeUtil;
19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.PathAttributes1;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.PathAttributes1Builder;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.ObjectType;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.destination.CLinkstateDestination;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.LinkCase;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.NodeCase;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.PrefixCase;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.LinkStateAttribute;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.LinkAttributesCase;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.NodeAttributesCase;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCase;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.path.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLinkstateCase;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.PathAttributes;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.PathAttributesBuilder;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes2;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.DestinationType;
35 import org.opendaylight.yangtools.yang.binding.DataObject;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
40 * Parser for Link State Path Attribute.
42 * @see <a href="http://tools.ietf.org/html/draft-gredler-idr-ls-distribution-04">BGP-LS draft</a>
44 public class LinkstateAttributeParser implements AttributeParser, AttributeSerializer {
46 private static final Logger LOG = LoggerFactory.getLogger(LinkstateAttributeParser.class);
48 private static final int TYPE = 29;
50 private static final int LEGACY_TYPE = 99;
52 private final int type;
54 public LinkstateAttributeParser(final boolean isIanaAssignedType) {
55 this.type = (isIanaAssignedType) ? TYPE : LEGACY_TYPE;
58 public int getType() {
63 public void parseAttribute(final ByteBuf buffer, final PathAttributesBuilder builder) throws BGPParsingException {
64 final ObjectType nlriType = getNlriType(builder);
65 if (nlriType == null) {
66 LOG.warn("No Linkstate NLRI found, not parsing Linkstate attribute");
69 final PathAttributes1 a = new PathAttributes1Builder().setLinkStateAttribute(parseLinkState(nlriType, buffer)).build();
70 builder.addAugmentation(PathAttributes1.class, a);
73 private ObjectType getNlriType(final PathAttributesBuilder pab) {
74 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes1 mpr = pab.getAugmentation(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes1.class);
75 if (mpr != null && mpr.getMpReachNlri() != null) {
76 final DestinationType dt = mpr.getMpReachNlri().getAdvertizedRoutes().getDestinationType();
77 if (dt instanceof DestinationLinkstateCase) {
78 for (final CLinkstateDestination d : ((DestinationLinkstateCase) dt).getDestinationLinkstate().getCLinkstateDestination()) {
79 return d.getObjectType();
83 final PathAttributes2 mpu = pab.getAugmentation(PathAttributes2.class);
84 if (mpu != null && mpu.getMpUnreachNlri() != null) {
85 final DestinationType dt = mpu.getMpUnreachNlri().getWithdrawnRoutes().getDestinationType();
86 if (dt instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.path.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLinkstateCase) {
87 for (final CLinkstateDestination d : ((org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.update.path.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLinkstateCase) dt).getDestinationLinkstate().getCLinkstateDestination()) {
88 return d.getObjectType();
95 private static LinkStateAttribute parseLinkState(final ObjectType nlri, final ByteBuf buffer) throws BGPParsingException {
97 * e.g. IS-IS Area Identifier TLV can occur multiple times
99 final Multimap<Integer, ByteBuf> map = HashMultimap.create();
100 while (buffer.isReadable()) {
101 final int type = buffer.readUnsignedShort();
102 final int length = buffer.readUnsignedShort();
103 final ByteBuf value = buffer.readSlice(length);
104 map.put(type, value);
106 if (nlri instanceof PrefixCase) {
107 return PrefixAttributesParser.parsePrefixAttributes(map);
108 } else if (nlri instanceof LinkCase) {
109 return LinkAttributesParser.parseLinkAttributes(map);
110 } else if (nlri instanceof NodeCase) {
111 return NodeAttributesParser.parseNodeAttributes(map);
113 throw new IllegalStateException("Unhandled NLRI type " + nlri);
118 * Serialize linkstate attributes.
120 * @param attribute DataObject representing LinkstatePathAttribute
121 * @param byteAggregator ByteBuf where all serialized data are aggregated
125 public void serializeAttribute(final DataObject attribute, final ByteBuf byteAggregator) {
126 Preconditions.checkArgument(attribute instanceof PathAttributes, "Attribute parameter is not a PathAttribute object.");
127 final PathAttributes1 pathAttributes1 = ((PathAttributes) attribute).getAugmentation(PathAttributes1.class);
128 if (pathAttributes1 == null) {
131 final LinkStateAttribute linkState = pathAttributes1.getLinkStateAttribute();
132 final ByteBuf lsBuffer = Unpooled.buffer();
133 if (linkState instanceof LinkAttributesCase) {
134 LinkAttributesParser.serializeLinkAttributes((LinkAttributesCase) linkState, lsBuffer);
135 } else if (linkState instanceof NodeAttributesCase) {
136 NodeAttributesParser.serializeNodeAttributes((NodeAttributesCase) linkState, lsBuffer);
137 } else if (linkState instanceof PrefixAttributesCase) {
138 PrefixAttributesParser.serializePrefixAttributes((PrefixAttributesCase) linkState, lsBuffer);
140 AttributeUtil.formatAttribute(AttributeUtil.OPTIONAL, getType(), lsBuffer, byteAggregator);