2 * Copyright (c) 2016 Brocade Communications 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.l3vpn;
10 import com.google.common.base.Preconditions;
11 import io.netty.buffer.ByteBuf;
12 import io.netty.buffer.Unpooled;
13 import java.util.List;
14 import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
15 import org.opendaylight.protocol.bgp.labeled.unicast.LUNlriParser;
16 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
17 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
18 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.LabelStack;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.path.attributes.Attributes;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.Attributes1;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.Attributes2;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.destination.DestinationType;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpReachNlriBuilder;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpUnreachNlriBuilder;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.reach.nlri.AdvertizedRoutes;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.unreach.nlri.WithdrawnRoutes;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.vpn.rev180329.l3vpn.ip.destination.type.VpnDestination;
30 import org.opendaylight.yangtools.yang.binding.DataObject;
31 import org.slf4j.Logger;
32 import org.slf4j.LoggerFactory;
34 public abstract class AbstractVpnNlriParser implements NlriParser, NlriSerializer {
35 private static final Logger LOG = LoggerFactory.getLogger(AbstractVpnNlriParser.class);
37 protected abstract List<VpnDestination> getWithdrawnVpnDestination(DestinationType dstType);
39 protected abstract List<VpnDestination> getAdvertizedVpnDestination(DestinationType dstType);
41 protected abstract WithdrawnRoutes getWithdrawnRoutesByDestination(List<VpnDestination> dst);
43 protected abstract AdvertizedRoutes getAdvertizedRoutesByDestination(List<VpnDestination> dst);
45 private static void serializeNlri(final List<VpnDestination> dests,
46 final boolean isWithdrawnRoute, final ByteBuf buffer) {
47 final ByteBuf nlriByteBuf = Unpooled.buffer();
48 for (final VpnDestination dest : dests) {
49 final List<LabelStack> labelStack = dest.getLabelStack();
50 final IpPrefix prefix = dest.getPrefix();
51 LOG.debug("Serializing Nlri: VpnDestination={}, IpPrefix={}", dest, prefix);
52 AbstractVpnNlriParser.serializeLengtField(prefix, labelStack, nlriByteBuf);
53 LUNlriParser.serializeLabelStackEntries(labelStack, isWithdrawnRoute, nlriByteBuf);
54 RouteDistinguisherUtil.serializeRouteDistinquisher(dest.getRouteDistinguisher(), nlriByteBuf);
55 Preconditions.checkArgument(prefix.getIpv6Prefix() != null || prefix.getIpv4Prefix() != null,
56 "Ipv6 or Ipv4 prefix is missing.");
57 LUNlriParser.serializePrefixField(prefix, nlriByteBuf);
59 buffer.writeBytes(nlriByteBuf);
63 * Serialize the length field Length field contains one Byte which represents the length of label stack and prefix
66 * @param prefix ipPrefix
67 * @param labelStack list of labelStack
68 * @param nlriByteBuf ByteBuf
70 static void serializeLengtField(final IpPrefix prefix, final List<LabelStack> labelStack,
71 final ByteBuf nlriByteBuf) {
72 final int prefixLenght = LUNlriParser.getPrefixLength(prefix);
73 int labelStackLenght = 0;
74 if (labelStack != null) {
75 labelStackLenght = LUNlriParser.LABEL_LENGTH * labelStack.size();
77 nlriByteBuf.writeByte((labelStackLenght + prefixLenght + RouteDistinguisherUtil.RD_LENGTH) * Byte.SIZE);
81 public void serializeAttribute(final DataObject attribute, final ByteBuf byteAggregator) {
82 Preconditions.checkArgument(attribute instanceof Attributes,
83 "Attribute parameter is not a Attributes object");
84 final Attributes pathAttributes = (Attributes) attribute;
85 final Attributes1 pathAttributes1 = pathAttributes.getAugmentation(Attributes1.class);
86 final Attributes2 pathAttributes2 = pathAttributes.getAugmentation(Attributes2.class);
87 List<VpnDestination> vpnDst = null;
88 boolean isWithdrawnRoute = false;
89 if (pathAttributes1 != null) {
90 final AdvertizedRoutes routes = (pathAttributes1.getMpReachNlri()).getAdvertizedRoutes();
92 vpnDst = getAdvertizedVpnDestination(routes.getDestinationType());
94 } else if (pathAttributes2 != null) {
95 final WithdrawnRoutes routes = pathAttributes2.getMpUnreachNlri().getWithdrawnRoutes();
97 vpnDst = getWithdrawnVpnDestination(routes.getDestinationType());
98 isWithdrawnRoute = true;
101 if (vpnDst != null) {
102 serializeNlri(vpnDst, isWithdrawnRoute, byteAggregator);
107 public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder) throws BGPParsingException {
108 if (!nlri.isReadable()) {
111 final List<VpnDestination> dst = VpnDestinationUtil.parseNlri(nlri, builder.getAfi());
112 builder.setWithdrawnRoutes(getWithdrawnRoutesByDestination(dst));
116 public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder) throws BGPParsingException {
117 if (!nlri.isReadable()) {
120 final List<VpnDestination> dst = VpnDestinationUtil.parseNlri(nlri, builder.getAfi());
121 builder.setAdvertizedRoutes(getAdvertizedRoutesByDestination(dst));