2 * Copyright (c) 2014 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.annotations.VisibleForTesting;
11 import com.google.common.collect.Multimap;
12 import io.netty.buffer.ByteBuf;
13 import io.netty.buffer.ByteBufUtil;
14 import io.netty.buffer.Unpooled;
15 import java.util.ArrayList;
16 import java.util.List;
17 import java.util.Map.Entry;
18 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.BindingSidLabelParser;
19 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.Ipv6SrPrefixAttributesParser;
20 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.RangeTlvParser;
21 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SrPrefixAttributesParser;
22 import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil;
23 import org.opendaylight.protocol.util.BitArray;
24 import org.opendaylight.protocol.util.ByteArray;
25 import org.opendaylight.protocol.util.Ipv4Util;
26 import org.opendaylight.protocol.util.Ipv6Util;
27 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ExtendedRouteTag;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.IgpBits.UpDown;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ProtocolId;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.RouteTag;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.LinkStateAttribute;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCase;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCaseBuilder;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.prefix.attributes._case.PrefixAttributes;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.prefix.attributes._case.PrefixAttributesBuilder;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.IgpBits;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.IgpBitsBuilder;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.Ipv6SrPrefix;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrBindingSidLabels;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrPrefix;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrRange;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.IgpMetric;
44 import org.slf4j.Logger;
45 import org.slf4j.LoggerFactory;
48 public final class PrefixAttributesParser {
50 private static final Logger LOG = LoggerFactory.getLogger(PrefixAttributesParser.class);
52 private PrefixAttributesParser() {
53 throw new UnsupportedOperationException();
56 private static final int ROUTE_TAG_LENGTH = 4;
57 private static final int EXTENDED_ROUTE_TAG_LENGTH = 8;
59 private static final int FLAGS_SIZE = 8;
60 private static final int UP_DOWN_BIT = 0;
61 private static final int OSPF_NO_UNICAST = 1;
62 private static final int OSPF_LOCAL_ADDRESS = 2;
63 private static final int OSPF_PROPAGATE_ADDRESS = 3;
65 /* Prefix Attribute TLVs */
66 private static final int IGP_FLAGS = 1152;
67 private static final int ROUTE_TAG = 1153;
68 private static final int EXTENDED_ROUTE_TAG = 1154;
69 private static final int PREFIX_METRIC = 1155;
70 private static final int FORWARDING_ADDRESS = 1156;
71 private static final int PREFIX_OPAQUE = 1157;
73 /* Segment routing TLV */
74 public static final int PREFIX_SID = 1158;
75 public static final int IPV6_PREFIX_SID = 1169;
76 public static final int RANGE = 1159;
77 public static final int BINDING_SID = 1160;
80 * Parse prefix attributes.
82 * @param attributes key is the tlv type and value are the value bytes of the tlv
83 * @param protocolId to differentiate parsing methods
84 * @return {@link LinkStateAttribute}
86 static LinkStateAttribute parsePrefixAttributes(final Multimap<Integer, ByteBuf> attributes, final ProtocolId protocolId) {
87 final PrefixAttributesBuilder builder = new PrefixAttributesBuilder();
88 final List<RouteTag> routeTags = new ArrayList<>();
89 final List<ExtendedRouteTag> exRouteTags = new ArrayList<>();
90 for (final Entry<Integer, ByteBuf> entry : attributes.entries()) {
91 final int key = entry.getKey();
92 final ByteBuf value = entry.getValue();
93 LOG.trace("Prefix attribute TLV {}", key);
94 parseAttribute(key, value, protocolId, builder, routeTags, exRouteTags);
96 LOG.trace("Finished parsing Prefix Attributes.");
97 builder.setRouteTags(routeTags);
98 builder.setExtendedTags(exRouteTags);
99 return new PrefixAttributesCaseBuilder().setPrefixAttributes(builder.build()).build();
102 private static void parseAttribute(final int key, final ByteBuf value, final ProtocolId protocolId, final PrefixAttributesBuilder builder, final List<RouteTag> routeTags, final List<ExtendedRouteTag> exRouteTags) {
105 final BitArray flags = BitArray.valueOf(value, FLAGS_SIZE);
106 final boolean upDownBit = flags.get(UP_DOWN_BIT);
107 final boolean ospfNoUnicast = flags.get(OSPF_NO_UNICAST);
108 final boolean ospfLocalAddress = flags.get(OSPF_LOCAL_ADDRESS);
109 final boolean ospfPropagateAddress = flags.get(OSPF_PROPAGATE_ADDRESS);
110 builder.setIgpBits(new IgpBitsBuilder().setUpDown(new UpDown(upDownBit))
111 .setIsIsUpDown(upDownBit)
112 .setOspfNoUnicast(ospfNoUnicast)
113 .setOspfLocalAddress(ospfLocalAddress)
114 .setOspfPropagateNssa(ospfPropagateAddress)
116 LOG.debug("Parsed IGP flag (up/down bit) : {}", upDownBit);
119 parseRouteTags(routeTags, value);
121 case EXTENDED_ROUTE_TAG:
122 parseExtendedRouteTags(exRouteTags, value);
125 final IgpMetric metric = new IgpMetric(value.readUnsignedInt());
126 builder.setPrefixMetric(metric);
127 LOG.debug("Parsed Metric: {}", metric);
129 case FORWARDING_ADDRESS:
130 final IpAddress fwdAddress = parseForwardingAddress(value);
131 builder.setOspfForwardingAddress(fwdAddress);
132 LOG.debug("Parsed FWD Address: {}", fwdAddress);
135 if (LOG.isDebugEnabled()) {
136 LOG.debug("Parsed Opaque value: {}, not preserving it", ByteBufUtil.hexDump(value));
140 final SrPrefix prefix = SrPrefixAttributesParser.parseSrPrefix(value, protocolId);
141 builder.setSrPrefix(prefix);
142 LOG.debug("Parsed SR Prefix: {}", prefix);
144 case IPV6_PREFIX_SID:
145 final Ipv6SrPrefix ipv6Prefix = Ipv6SrPrefixAttributesParser.parseSrIpv6Prefix(value);
146 builder.setIpv6SrPrefix(ipv6Prefix);
147 LOG.debug("Parsed Ipv6 SR Prefix: {}", ipv6Prefix);
150 final SrRange range = RangeTlvParser.parseSrRange(value, protocolId);
151 builder.setSrRange(range);
152 LOG.debug("Parsed SR Range: {}", range);
155 final SrBindingSidLabels label = BindingSidLabelParser.parseBindingSidLabel(value, protocolId);
156 if (builder.getSrBindingSidLabels() != null) {
157 builder.getSrBindingSidLabels().add(label);
159 final List<SrBindingSidLabels> labels = new ArrayList<SrBindingSidLabels>();
161 builder.setSrBindingSidLabels(labels);
163 LOG.debug("Parsed SR Binding SID {}", label);
166 LOG.warn("TLV {} is not a valid prefix attribute, ignoring it", key);
170 private static void parseRouteTags(final List<RouteTag> routeTags, final ByteBuf value) {
171 while (value.isReadable()) {
172 final RouteTag routeTag = new RouteTag(ByteArray.readBytes(value, ROUTE_TAG_LENGTH));
173 routeTags.add(routeTag);
174 LOG.debug("Parsed Route Tag: {}", routeTag);
178 private static void parseExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf value) {
179 while (value.isReadable()) {
180 final ExtendedRouteTag exRouteTag = new ExtendedRouteTag(ByteArray.readBytes(value, EXTENDED_ROUTE_TAG_LENGTH));
181 exRouteTags.add(exRouteTag);
182 LOG.debug("Parsed Extended Route Tag: {}", exRouteTag);
186 private static IpAddress parseForwardingAddress(final ByteBuf value) {
187 IpAddress fwdAddress = null;
188 switch (value.readableBytes()) {
189 case Ipv4Util.IP4_LENGTH:
190 fwdAddress = new IpAddress(Ipv4Util.addressForByteBuf(value));
192 case Ipv6Util.IPV6_LENGTH:
193 fwdAddress = new IpAddress(Ipv6Util.addressForByteBuf(value));
196 LOG.debug("Ignoring unsupported forwarding address length {}", value.readableBytes());
201 static void serializePrefixAttributes(final PrefixAttributesCase prefixAttributesCase, final ByteBuf byteAggregator) {
202 final PrefixAttributes prefixAtrributes = prefixAttributesCase.getPrefixAttributes();
203 if (prefixAtrributes.getIgpBits() != null) {
204 final BitArray igpBit = new BitArray(FLAGS_SIZE);
205 final IgpBits igpBits = prefixAtrributes.getIgpBits();
206 igpBit.set(UP_DOWN_BIT, igpBits.getUpDown().isUpDown() || igpBits.isIsIsUpDown());
207 igpBit.set(OSPF_NO_UNICAST, igpBits.isOspfNoUnicast());
208 igpBit.set(OSPF_LOCAL_ADDRESS, igpBits.isOspfLocalAddress());
209 igpBit.set(OSPF_PROPAGATE_ADDRESS, igpBits.isOspfPropagateNssa());
210 TlvUtil.writeTLV(IGP_FLAGS, Unpooled.wrappedBuffer(igpBit.array()), byteAggregator);
212 serializeRouteTags(prefixAtrributes.getRouteTags(), byteAggregator);
213 serializeExtendedRouteTags(prefixAtrributes.getExtendedTags(), byteAggregator);
214 if (prefixAtrributes.getPrefixMetric() != null) {
215 TlvUtil.writeTLV(PREFIX_METRIC, Unpooled.copyInt(prefixAtrributes.getPrefixMetric().getValue().intValue()), byteAggregator);
217 serializeForwardingAddress(prefixAtrributes.getOspfForwardingAddress(), byteAggregator);
218 if (prefixAtrributes.getSrPrefix() != null) {
219 final ByteBuf buffer = Unpooled.buffer();
220 SrPrefixAttributesParser.serializeSrPrefix(prefixAtrributes.getSrPrefix(), buffer);
221 TlvUtil.writeTLV(PREFIX_SID, buffer, byteAggregator);
223 if (prefixAtrributes.getIpv6SrPrefix() != null) {
224 final ByteBuf buffer = Unpooled.buffer();
225 Ipv6SrPrefixAttributesParser.serializeIpv6SrPrefix(prefixAtrributes.getIpv6SrPrefix(), buffer);
226 TlvUtil.writeTLV(IPV6_PREFIX_SID, buffer, byteAggregator);
228 if (prefixAtrributes.getSrRange() != null) {
229 final ByteBuf sidBuffer = Unpooled.buffer();
230 RangeTlvParser.serializeSrRange(prefixAtrributes.getSrRange(), sidBuffer);
231 TlvUtil.writeTLV(RANGE, sidBuffer, byteAggregator);
233 if (prefixAtrributes.getSrBindingSidLabels() != null) {
234 BindingSidLabelParser.serializeBindingSidLabels(prefixAtrributes.getSrBindingSidLabels(), byteAggregator, BINDING_SID);
238 private static void serializeRouteTags(final List<RouteTag> routeTags, final ByteBuf byteAggregator) {
239 if (routeTags != null) {
240 final ByteBuf routeTagsBuf = Unpooled.buffer();
241 for (final RouteTag routeTag : routeTags) {
242 routeTagsBuf.writeBytes(routeTag.getValue());
244 TlvUtil.writeTLV(ROUTE_TAG, routeTagsBuf, byteAggregator);
248 private static void serializeExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf byteAggregator) {
249 if (exRouteTags != null) {
250 final ByteBuf extendedBuf = Unpooled.buffer();
251 for (final ExtendedRouteTag exRouteTag : exRouteTags) {
252 extendedBuf.writeBytes(exRouteTag.getValue());
254 TlvUtil.writeTLV(EXTENDED_ROUTE_TAG, extendedBuf, byteAggregator);
258 private static void serializeForwardingAddress(final IpAddress forwardingAddress, final ByteBuf byteAggregator) {
259 if (forwardingAddress != null) {
260 final ByteBuf ospfBuf = Unpooled.buffer();
261 if (forwardingAddress.getIpv4Address() != null) {
262 ospfBuf.writeBytes(Ipv4Util.bytesForAddress(forwardingAddress.getIpv4Address()));
263 } else if (forwardingAddress.getIpv6Address() != null) {
264 ospfBuf.writeBytes(Ipv6Util.bytesForAddress(forwardingAddress.getIpv6Address()));
266 TlvUtil.writeTLV(FORWARDING_ADDRESS, ospfBuf, byteAggregator);