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.parser.impl.message.update;
10 import com.google.common.base.Preconditions;
11 import io.netty.buffer.ByteBuf;
12 import io.netty.buffer.Unpooled;
13 import org.opendaylight.protocol.bgp.parser.AttributeFlags;
14 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
15 import org.opendaylight.protocol.bgp.parser.BGPError;
16 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
17 import org.opendaylight.protocol.bgp.parser.spi.AttributeParser;
18 import org.opendaylight.protocol.bgp.parser.spi.AttributeSerializer;
19 import org.opendaylight.protocol.bgp.parser.spi.NlriRegistry;
20 import org.opendaylight.protocol.util.Ipv4Util;
21 import org.opendaylight.protocol.util.Ipv6Util;
22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Prefix;
23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Prefix;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.PathAttributes;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.PathAttributesBuilder;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes1;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes1Builder;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.DestinationType;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.destination.type.DestinationIpv4Case;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.destination.type.DestinationIpv6Case;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlri;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.mp.reach.nlri.AdvertizedRoutes;
33 import org.opendaylight.yangtools.yang.binding.DataObject;
36 public final class MPReachAttributeParser implements AttributeParser, AttributeSerializer {
38 public static final int TYPE = 14;
39 public static final int ATTR_LENGTH = 2;
40 public static final int MAX_ATTR_LENGTH_FOR_SINGLE_BYTE = 127;
41 private final NlriRegistry reg;
43 public MPReachAttributeParser(final NlriRegistry reg) {
44 this.reg = Preconditions.checkNotNull(reg);
48 public void parseAttribute(final ByteBuf buffer, final PathAttributesBuilder builder) throws BGPDocumentedException {
50 final PathAttributes1 a = new PathAttributes1Builder().setMpReachNlri(this.reg.parseMpReach(buffer)).build();
51 builder.addAugmentation(PathAttributes1.class, a);
52 } catch (final BGPParsingException e) {
53 throw new BGPDocumentedException("Could not parse MP_REACH_NLRI", BGPError.OPT_ATTR_ERROR, e);
58 public void serializeAttribute(DataObject attribute, ByteBuf byteAggregator) {
59 PathAttributes pathAttributes = (PathAttributes) attribute;
60 PathAttributes1 pathAttributes1 = pathAttributes.getAugmentation(PathAttributes1.class);
61 if (pathAttributes1 == null) {
64 MpReachNlri mpReachNlri = pathAttributes1.getMpReachNlri();
65 ByteBuf reachBuffer = Unpooled.buffer();
66 this.reg.serializeMpReach(mpReachNlri, reachBuffer);
68 serializeAdvertizedRoutes(mpReachNlri.getAdvertizedRoutes(), reachBuffer);
69 if (reachBuffer.writerIndex() > MAX_ATTR_LENGTH_FOR_SINGLE_BYTE) {
70 byteAggregator.writeByte(AttributeFlags.OPTIONAL | AttributeFlags.EXTENDED);
71 byteAggregator.writeByte(TYPE);
72 byteAggregator.writeShort(reachBuffer.writerIndex());
74 byteAggregator.writeByte(AttributeFlags.OPTIONAL);
75 byteAggregator.writeByte(TYPE);
76 byteAggregator.writeByte(reachBuffer.writerIndex());
78 byteAggregator.writeBytes(reachBuffer);
83 private void serializeAdvertizedRoutes(AdvertizedRoutes advertizedRoutes, ByteBuf byteAggregator) {
84 DestinationType destinationType = advertizedRoutes.getDestinationType();
85 if (destinationType instanceof DestinationIpv4Case) {
86 DestinationIpv4Case destinationIpv4Case = (DestinationIpv4Case) destinationType;
87 for (Ipv4Prefix ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
88 byteAggregator.writeByte(Ipv4Util.getPrefixLength(ipv4Prefix.getValue()));
89 byteAggregator.writeBytes(Ipv4Util.bytesForPrefixByPrefixLength(ipv4Prefix));
91 } else if (destinationType instanceof DestinationIpv6Case) {
92 DestinationIpv6Case destinationIpv6Case = (DestinationIpv6Case) destinationType;
93 for (Ipv6Prefix ipv6Prefix : destinationIpv6Case.getDestinationIpv6().getIpv6Prefixes()) {
94 byteAggregator.writeByte(Ipv4Util.getPrefixLength(ipv6Prefix.getValue()));
95 byteAggregator.writeBytes(Ipv6Util.bytesForPrefixByPrefixLength(ipv6Prefix));