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.concepts.Ipv4Util;
21 import org.opendaylight.protocol.concepts.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.PathAttributes2;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.PathAttributes2Builder;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.destination.type.DestinationIpv4Case;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.destination.destination.type.DestinationIpv6Case;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlri;
31 import org.opendaylight.yangtools.yang.binding.DataObject;
33 public final class MPUnreachAttributeParser implements AttributeParser, AttributeSerializer {
34 public static final int TYPE = 15;
35 public static final int MAX_ATTR_LENGTH_FOR_SINGLE_BYTE = 127;
37 private final NlriRegistry reg;
39 public MPUnreachAttributeParser(final NlriRegistry reg) {
40 this.reg = Preconditions.checkNotNull(reg);
44 public void parseAttribute(final ByteBuf buffer, final PathAttributesBuilder builder) throws BGPDocumentedException {
46 final PathAttributes2 a = new PathAttributes2Builder().setMpUnreachNlri(this.reg.parseMpUnreach(buffer)).build();
47 builder.addAugmentation(PathAttributes2.class, a);
48 } catch (final BGPParsingException e) {
49 throw new BGPDocumentedException("Could not parse MP_UNREACH_NLRI", BGPError.OPT_ATTR_ERROR, e);
54 public void serializeAttribute(DataObject attribute, ByteBuf byteAggregator) {
55 PathAttributes pathAttributes = (PathAttributes) attribute;
56 PathAttributes2 pathAttributes2 = pathAttributes.getAugmentation(PathAttributes2.class);
57 if (pathAttributes2 == null) {
60 MpUnreachNlri mpUnreachNlri = pathAttributes2.getMpUnreachNlri();
61 ByteBuf unreachBuffer = Unpooled.buffer();
62 this.reg.serializeMpUnReach(mpUnreachNlri, unreachBuffer);
64 if (mpUnreachNlri.getWithdrawnRoutes() != null) {
65 if (mpUnreachNlri.getWithdrawnRoutes().getDestinationType() instanceof DestinationIpv4Case) {
66 DestinationIpv4Case destinationIpv4Case = (DestinationIpv4Case) mpUnreachNlri.getWithdrawnRoutes().getDestinationType();
67 if (destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes() != null) {
68 for (Ipv4Prefix ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
69 unreachBuffer.writeByte(Ipv4Util.getPrefixLength(ipv4Prefix.getValue()));
70 unreachBuffer.writeBytes(Ipv4Util.bytesForPrefixByPrefixLength(ipv4Prefix));
74 if (mpUnreachNlri.getWithdrawnRoutes().getDestinationType() instanceof DestinationIpv6Case) {
75 DestinationIpv6Case destinationIpv6Case = (DestinationIpv6Case) mpUnreachNlri.getWithdrawnRoutes().getDestinationType();
76 if (destinationIpv6Case.getDestinationIpv6().getIpv6Prefixes() != null) {
77 for (Ipv6Prefix ipv6Prefix : destinationIpv6Case.getDestinationIpv6().getIpv6Prefixes()) {
78 unreachBuffer.writeByte(Ipv4Util.getPrefixLength(ipv6Prefix.getValue()));
79 unreachBuffer.writeBytes(Ipv6Util.bytesForPrefixByPrefixLength(ipv6Prefix));
84 if (unreachBuffer.writerIndex() > MAX_ATTR_LENGTH_FOR_SINGLE_BYTE) {
85 byteAggregator.writeByte(AttributeFlags.OPTIONAL | AttributeFlags.EXTENDED);
86 byteAggregator.writeByte(TYPE);
87 byteAggregator.writeShort(unreachBuffer.writerIndex());
89 byteAggregator.writeByte(AttributeFlags.OPTIONAL);
90 byteAggregator.writeByte(TYPE);
91 byteAggregator.writeByte(unreachBuffer.writerIndex());
93 byteAggregator.writeBytes(unreachBuffer);