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.RangeTlvParser;
20 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SrPrefixAttributesParser;
21 import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil;
22 import org.opendaylight.protocol.util.BitArray;
23 import org.opendaylight.protocol.util.ByteArray;
24 import org.opendaylight.protocol.util.Ipv4Util;
25 import org.opendaylight.protocol.util.Ipv6Util;
26 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ExtendedRouteTag;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.IgpBits.UpDown;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.RouteTag;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.LinkStateAttribute;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCase;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCaseBuilder;
33 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;
34 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;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.IgpBitsBuilder;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrBindingSidLabel;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrPrefix;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrRange;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.IgpMetric;
40 import org.slf4j.Logger;
41 import org.slf4j.LoggerFactory;
44 public final class PrefixAttributesParser {
46 private static final Logger LOG = LoggerFactory.getLogger(PrefixAttributesParser.class);
48 private PrefixAttributesParser() {
49 throw new UnsupportedOperationException();
52 private static final int ROUTE_TAG_LENGTH = 4;
53 private static final int EXTENDED_ROUTE_TAG_LENGTH = 8;
55 private static final int FLAGS_SIZE = 8;
56 private static final int UP_DOWN_BIT = 0;
58 /* Prefix Attribute TLVs */
59 private static final int IGP_FLAGS = 1152;
60 private static final int ROUTE_TAG = 1153;
61 private static final int EXTENDED_ROUTE_TAG = 1154;
62 private static final int PREFIX_METRIC = 1155;
63 private static final int FORWARDING_ADDRESS = 1156;
64 private static final int PREFIX_OPAQUE = 1157;
66 /* Segment routing TLV */
67 public static final int PREFIX_SID = 1158;
68 public static final int RANGE = 1159;
69 public static final int BINDING_SID = 1160;
72 * Parse prefix attributes.
74 * @param attributes key is the tlv type and value are the value bytes of the tlv
75 * @return {@link LinkStateAttribute}
77 static LinkStateAttribute parsePrefixAttributes(final Multimap<Integer, ByteBuf> attributes) {
78 final PrefixAttributesBuilder builder = new PrefixAttributesBuilder();
79 final List<RouteTag> routeTags = new ArrayList<>();
80 final List<ExtendedRouteTag> exRouteTags = new ArrayList<>();
81 for (final Entry<Integer, ByteBuf> entry : attributes.entries()) {
82 final int key = entry.getKey();
83 final ByteBuf value = entry.getValue();
84 LOG.trace("Prefix attribute TLV {}", key);
85 parseAttribute(key, value, builder, routeTags, exRouteTags);
87 LOG.trace("Finished parsing Prefix Attributes.");
88 builder.setRouteTags(routeTags);
89 builder.setExtendedTags(exRouteTags);
90 return new PrefixAttributesCaseBuilder().setPrefixAttributes(builder.build()).build();
93 private static void parseAttribute(final int key, final ByteBuf value, final PrefixAttributesBuilder builder, final List<RouteTag> routeTags, final List<ExtendedRouteTag> exRouteTags) {
96 final BitArray flags = BitArray.valueOf(value, FLAGS_SIZE);
97 final boolean upDownBit = flags.get(UP_DOWN_BIT);
98 builder.setIgpBits(new IgpBitsBuilder().setUpDown(new UpDown(upDownBit)).build());
99 LOG.debug("Parsed IGP flag (up/down bit) : {}", upDownBit);
102 parseRouteTags(routeTags, value);
104 case EXTENDED_ROUTE_TAG:
105 parseExtendedRouteTags(exRouteTags, value);
108 final IgpMetric metric = new IgpMetric(value.readUnsignedInt());
109 builder.setPrefixMetric(metric);
110 LOG.debug("Parsed Metric: {}", metric);
112 case FORWARDING_ADDRESS:
113 final IpAddress fwdAddress = parseForwardingAddress(value);
114 builder.setOspfForwardingAddress(fwdAddress);
115 LOG.debug("Parsed FWD Address: {}", fwdAddress);
118 if (LOG.isDebugEnabled()) {
119 LOG.debug("Parsed Opaque value: {}, not preserving it", ByteBufUtil.hexDump(value));
123 final SrPrefix prefix = SrPrefixAttributesParser.parseSrPrefix(value);
124 builder.setSrPrefix(prefix);
125 LOG.debug("Parsed SR Prefix: {}", prefix);
128 final SrRange range = RangeTlvParser.parseSrRange(value);
129 builder.setSrRange(range);
130 LOG.debug("Parsed SR Range: {}", range);
133 final SrBindingSidLabel label = BindingSidLabelParser.parseBindingSidLabel(value);
134 builder.setSrBindingSidLabel(label);
135 LOG.debug("Parsed SR Binding SID {}", label);
138 LOG.warn("TLV {} is not a valid prefix attribute, ignoring it", key);
142 private static void parseRouteTags(final List<RouteTag> routeTags, final ByteBuf value) {
143 while (value.isReadable()) {
144 final RouteTag routeTag = new RouteTag(ByteArray.readBytes(value, ROUTE_TAG_LENGTH));
145 routeTags.add(routeTag);
146 LOG.debug("Parsed Route Tag: {}", routeTag);
150 private static void parseExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf value) {
151 while (value.isReadable()) {
152 final ExtendedRouteTag exRouteTag = new ExtendedRouteTag(ByteArray.readBytes(value, EXTENDED_ROUTE_TAG_LENGTH));
153 exRouteTags.add(exRouteTag);
154 LOG.debug("Parsed Extended Route Tag: {}", exRouteTag);
158 private static IpAddress parseForwardingAddress(final ByteBuf value) {
159 IpAddress fwdAddress = null;
160 switch (value.readableBytes()) {
161 case Ipv4Util.IP4_LENGTH:
162 fwdAddress = new IpAddress(Ipv4Util.addressForByteBuf(value));
164 case Ipv6Util.IPV6_LENGTH:
165 fwdAddress = new IpAddress(Ipv6Util.addressForByteBuf(value));
168 LOG.debug("Ignoring unsupported forwarding address length {}", value.readableBytes());
173 static void serializePrefixAttributes(final PrefixAttributesCase prefixAttributesCase, final ByteBuf byteAggregator) {
174 final PrefixAttributes prefixAtrributes = prefixAttributesCase.getPrefixAttributes();
175 if (prefixAtrributes.getIgpBits() != null) {
176 final BitArray igpBit = new BitArray(FLAGS_SIZE);
177 igpBit.set(UP_DOWN_BIT, prefixAtrributes.getIgpBits().getUpDown().isUpDown());
178 TlvUtil.writeTLV(IGP_FLAGS, Unpooled.wrappedBuffer(igpBit.array()), byteAggregator);
180 serializeRouteTags(prefixAtrributes.getRouteTags(), byteAggregator);
181 serializeExtendedRouteTags(prefixAtrributes.getExtendedTags(), byteAggregator);
182 if (prefixAtrributes.getPrefixMetric() != null) {
183 TlvUtil.writeTLV(PREFIX_METRIC, Unpooled.copyInt(prefixAtrributes.getPrefixMetric().getValue().intValue()), byteAggregator);
185 serializeForwardingAddress(prefixAtrributes.getOspfForwardingAddress(), byteAggregator);
186 if (prefixAtrributes.getSrPrefix() != null) {
187 final ByteBuf buffer = Unpooled.buffer();
188 SrPrefixAttributesParser.serializeSrPrefix(prefixAtrributes.getSrPrefix(), buffer);
189 TlvUtil.writeTLV(PREFIX_SID, buffer, byteAggregator);
191 if (prefixAtrributes.getSrRange() != null) {
192 final ByteBuf sidBuffer = Unpooled.buffer();
193 RangeTlvParser.serializeSrRange(prefixAtrributes.getSrRange(), sidBuffer);
194 TlvUtil.writeTLV(RANGE, sidBuffer, byteAggregator);
196 if (prefixAtrributes.getSrBindingSidLabel() != null) {
197 final ByteBuf sidBuffer = Unpooled.buffer();
198 BindingSidLabelParser.serializeBindingSidLabel(prefixAtrributes.getSrBindingSidLabel(), sidBuffer);
199 TlvUtil.writeTLV(BINDING_SID, sidBuffer, byteAggregator);
203 private static void serializeRouteTags(final List<RouteTag> routeTags, final ByteBuf byteAggregator) {
204 if (routeTags != null) {
205 final ByteBuf routeTagsBuf = Unpooled.buffer();
206 for (final RouteTag routeTag : routeTags) {
207 routeTagsBuf.writeBytes(routeTag.getValue());
209 TlvUtil.writeTLV(ROUTE_TAG, routeTagsBuf, byteAggregator);
213 private static void serializeExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf byteAggregator) {
214 if (exRouteTags != null) {
215 final ByteBuf extendedBuf = Unpooled.buffer();
216 for (final ExtendedRouteTag exRouteTag : exRouteTags) {
217 extendedBuf.writeBytes(exRouteTag.getValue());
219 TlvUtil.writeTLV(EXTENDED_ROUTE_TAG, extendedBuf, byteAggregator);
223 private static void serializeForwardingAddress(final IpAddress forwardingAddress, final ByteBuf byteAggregator) {
224 if (forwardingAddress != null) {
225 final ByteBuf ospfBuf = Unpooled.buffer();
226 if (forwardingAddress.getIpv4Address() != null) {
227 ospfBuf.writeBytes(Ipv4Util.bytesForAddress(forwardingAddress.getIpv4Address()));
228 } else if (forwardingAddress.getIpv6Address() != null) {
229 ospfBuf.writeBytes(Ipv6Util.bytesForAddress(forwardingAddress.getIpv6Address()));
231 TlvUtil.writeTLV(FORWARDING_ADDRESS, ospfBuf, byteAggregator);