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.ProtocolId;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.RouteTag;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.LinkStateAttribute;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCase;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.PrefixAttributesCaseBuilder;
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.PrefixAttributes;
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.PrefixAttributesBuilder;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.IgpBitsBuilder;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrBindingSidLabels;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrPrefix;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrRange;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.IgpMetric;
41 import org.slf4j.Logger;
42 import org.slf4j.LoggerFactory;
45 public final class PrefixAttributesParser {
47 private static final Logger LOG = LoggerFactory.getLogger(PrefixAttributesParser.class);
49 private PrefixAttributesParser() {
50 throw new UnsupportedOperationException();
53 private static final int ROUTE_TAG_LENGTH = 4;
54 private static final int EXTENDED_ROUTE_TAG_LENGTH = 8;
56 private static final int FLAGS_SIZE = 8;
57 private static final int UP_DOWN_BIT = 0;
59 /* Prefix Attribute TLVs */
60 private static final int IGP_FLAGS = 1152;
61 private static final int ROUTE_TAG = 1153;
62 private static final int EXTENDED_ROUTE_TAG = 1154;
63 private static final int PREFIX_METRIC = 1155;
64 private static final int FORWARDING_ADDRESS = 1156;
65 private static final int PREFIX_OPAQUE = 1157;
67 /* Segment routing TLV */
68 public static final int PREFIX_SID = 1158;
69 public static final int RANGE = 1159;
70 public static final int BINDING_SID = 1160;
73 * Parse prefix attributes.
75 * @param attributes key is the tlv type and value are the value bytes of the tlv
76 * @param protocolId to differentiate parsing methods
77 * @return {@link LinkStateAttribute}
79 static LinkStateAttribute parsePrefixAttributes(final Multimap<Integer, ByteBuf> attributes, final ProtocolId protocolId) {
80 final PrefixAttributesBuilder builder = new PrefixAttributesBuilder();
81 final List<RouteTag> routeTags = new ArrayList<>();
82 final List<ExtendedRouteTag> exRouteTags = new ArrayList<>();
83 for (final Entry<Integer, ByteBuf> entry : attributes.entries()) {
84 final int key = entry.getKey();
85 final ByteBuf value = entry.getValue();
86 LOG.trace("Prefix attribute TLV {}", key);
87 parseAttribute(key, value, protocolId, builder, routeTags, exRouteTags);
89 LOG.trace("Finished parsing Prefix Attributes.");
90 builder.setRouteTags(routeTags);
91 builder.setExtendedTags(exRouteTags);
92 return new PrefixAttributesCaseBuilder().setPrefixAttributes(builder.build()).build();
95 private static void parseAttribute(final int key, final ByteBuf value, final ProtocolId protocolId, final PrefixAttributesBuilder builder, final List<RouteTag> routeTags, final List<ExtendedRouteTag> exRouteTags) {
98 final BitArray flags = BitArray.valueOf(value, FLAGS_SIZE);
99 final boolean upDownBit = flags.get(UP_DOWN_BIT);
100 builder.setIgpBits(new IgpBitsBuilder().setUpDown(new UpDown(upDownBit)).build());
101 LOG.debug("Parsed IGP flag (up/down bit) : {}", upDownBit);
104 parseRouteTags(routeTags, value);
106 case EXTENDED_ROUTE_TAG:
107 parseExtendedRouteTags(exRouteTags, value);
110 final IgpMetric metric = new IgpMetric(value.readUnsignedInt());
111 builder.setPrefixMetric(metric);
112 LOG.debug("Parsed Metric: {}", metric);
114 case FORWARDING_ADDRESS:
115 final IpAddress fwdAddress = parseForwardingAddress(value);
116 builder.setOspfForwardingAddress(fwdAddress);
117 LOG.debug("Parsed FWD Address: {}", fwdAddress);
120 if (LOG.isDebugEnabled()) {
121 LOG.debug("Parsed Opaque value: {}, not preserving it", ByteBufUtil.hexDump(value));
125 final SrPrefix prefix = SrPrefixAttributesParser.parseSrPrefix(value, protocolId);
126 builder.setSrPrefix(prefix);
127 LOG.debug("Parsed SR Prefix: {}", prefix);
130 final SrRange range = RangeTlvParser.parseSrRange(value, protocolId);
131 builder.setSrRange(range);
132 LOG.debug("Parsed SR Range: {}", range);
135 final SrBindingSidLabels label = BindingSidLabelParser.parseBindingSidLabel(value, protocolId);
136 if (builder.getSrBindingSidLabels() != null) {
137 builder.getSrBindingSidLabels().add(label);
139 final List<SrBindingSidLabels> labels = new ArrayList<SrBindingSidLabels>();
141 builder.setSrBindingSidLabels(labels);
143 LOG.debug("Parsed SR Binding SID {}", label);
146 LOG.warn("TLV {} is not a valid prefix attribute, ignoring it", key);
150 private static void parseRouteTags(final List<RouteTag> routeTags, final ByteBuf value) {
151 while (value.isReadable()) {
152 final RouteTag routeTag = new RouteTag(ByteArray.readBytes(value, ROUTE_TAG_LENGTH));
153 routeTags.add(routeTag);
154 LOG.debug("Parsed Route Tag: {}", routeTag);
158 private static void parseExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf value) {
159 while (value.isReadable()) {
160 final ExtendedRouteTag exRouteTag = new ExtendedRouteTag(ByteArray.readBytes(value, EXTENDED_ROUTE_TAG_LENGTH));
161 exRouteTags.add(exRouteTag);
162 LOG.debug("Parsed Extended Route Tag: {}", exRouteTag);
166 private static IpAddress parseForwardingAddress(final ByteBuf value) {
167 IpAddress fwdAddress = null;
168 switch (value.readableBytes()) {
169 case Ipv4Util.IP4_LENGTH:
170 fwdAddress = new IpAddress(Ipv4Util.addressForByteBuf(value));
172 case Ipv6Util.IPV6_LENGTH:
173 fwdAddress = new IpAddress(Ipv6Util.addressForByteBuf(value));
176 LOG.debug("Ignoring unsupported forwarding address length {}", value.readableBytes());
181 static void serializePrefixAttributes(final PrefixAttributesCase prefixAttributesCase, final ByteBuf byteAggregator) {
182 final PrefixAttributes prefixAtrributes = prefixAttributesCase.getPrefixAttributes();
183 if (prefixAtrributes.getIgpBits() != null) {
184 final BitArray igpBit = new BitArray(FLAGS_SIZE);
185 igpBit.set(UP_DOWN_BIT, prefixAtrributes.getIgpBits().getUpDown().isUpDown());
186 TlvUtil.writeTLV(IGP_FLAGS, Unpooled.wrappedBuffer(igpBit.array()), byteAggregator);
188 serializeRouteTags(prefixAtrributes.getRouteTags(), byteAggregator);
189 serializeExtendedRouteTags(prefixAtrributes.getExtendedTags(), byteAggregator);
190 if (prefixAtrributes.getPrefixMetric() != null) {
191 TlvUtil.writeTLV(PREFIX_METRIC, Unpooled.copyInt(prefixAtrributes.getPrefixMetric().getValue().intValue()), byteAggregator);
193 serializeForwardingAddress(prefixAtrributes.getOspfForwardingAddress(), byteAggregator);
194 if (prefixAtrributes.getSrPrefix() != null) {
195 final ByteBuf buffer = Unpooled.buffer();
196 SrPrefixAttributesParser.serializeSrPrefix(prefixAtrributes.getSrPrefix(), buffer);
197 TlvUtil.writeTLV(PREFIX_SID, buffer, byteAggregator);
199 if (prefixAtrributes.getSrRange() != null) {
200 final ByteBuf sidBuffer = Unpooled.buffer();
201 RangeTlvParser.serializeSrRange(prefixAtrributes.getSrRange(), sidBuffer);
202 TlvUtil.writeTLV(RANGE, sidBuffer, byteAggregator);
204 if (prefixAtrributes.getSrBindingSidLabels() != null) {
205 BindingSidLabelParser.serializeBindingSidLabels(prefixAtrributes.getSrBindingSidLabels(), byteAggregator, BINDING_SID);
209 private static void serializeRouteTags(final List<RouteTag> routeTags, final ByteBuf byteAggregator) {
210 if (routeTags != null) {
211 final ByteBuf routeTagsBuf = Unpooled.buffer();
212 for (final RouteTag routeTag : routeTags) {
213 routeTagsBuf.writeBytes(routeTag.getValue());
215 TlvUtil.writeTLV(ROUTE_TAG, routeTagsBuf, byteAggregator);
219 private static void serializeExtendedRouteTags(final List<ExtendedRouteTag> exRouteTags, final ByteBuf byteAggregator) {
220 if (exRouteTags != null) {
221 final ByteBuf extendedBuf = Unpooled.buffer();
222 for (final ExtendedRouteTag exRouteTag : exRouteTags) {
223 extendedBuf.writeBytes(exRouteTag.getValue());
225 TlvUtil.writeTLV(EXTENDED_ROUTE_TAG, extendedBuf, byteAggregator);
229 private static void serializeForwardingAddress(final IpAddress forwardingAddress, final ByteBuf byteAggregator) {
230 if (forwardingAddress != null) {
231 final ByteBuf ospfBuf = Unpooled.buffer();
232 if (forwardingAddress.getIpv4Address() != null) {
233 ospfBuf.writeBytes(Ipv4Util.bytesForAddress(forwardingAddress.getIpv4Address()));
234 } else if (forwardingAddress.getIpv6Address() != null) {
235 ospfBuf.writeBytes(Ipv6Util.bytesForAddress(forwardingAddress.getIpv6Address()));
237 TlvUtil.writeTLV(FORWARDING_ADDRESS, ospfBuf, byteAggregator);