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;
10 import java.util.List;
11 import org.eclipse.jdt.annotation.NonNull;
12 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
13 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.Open;
14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.BgpParameters;
15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.OptionalCapabilities;
16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
17 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
18 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
19 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
21 public final class AsNumberUtil {
23 private AsNumberUtil() {
24 throw new UnsupportedOperationException();
28 * Looks for As4Byte Capability in capabilities and extracts AS number.
30 * @param open remote BGP open message
33 public static @NonNull AsNumber advertizedAsNumber(final Open open) {
34 // Look for AS4 capability very defensively
35 final List<BgpParameters> params = open.getBgpParameters();
37 for (final BgpParameters p : params) {
38 for (final OptionalCapabilities oc : p.getOptionalCapabilities()) {
39 if (oc.getCParameters() != null && oc.getCParameters().getAs4BytesCapability() != null) {
40 return oc.getCParameters().getAs4BytesCapability().getAsNumber();
45 // Fallback to whatever is in the header
46 return new AsNumber(open.getMyAsNumber().longValue());
50 * Extract AS from Container Node.
52 * @param dtc route container
53 * @param nid as node identifier
56 public static AsNumber extractAS(final DataContainerNode<?> dtc, final NodeIdentifier nid) {
57 final NormalizedNode<?, ?> as = NormalizedNodes.findNode(dtc, nid).orElse(null);
59 return new AsNumber((Long) as.getValue());