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.rev200120.Open;
14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.BgpParameters;
15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.OptionalCapabilities;
16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParameters;
17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.c.parameters.As4BytesCapability;
18 import org.opendaylight.yangtools.yang.common.Uint32;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
20 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
24 public final class AsNumberUtil {
25 private AsNumberUtil() {
30 * Looks for As4Byte Capability in capabilities and extracts AS number.
32 * @param open remote BGP open message
35 public static @NonNull AsNumber advertizedAsNumber(final Open open) {
36 // Look for AS4 capability very defensively
37 final List<BgpParameters> params = open.getBgpParameters();
39 for (final BgpParameters p : params) {
40 for (final OptionalCapabilities oc : p.nonnullOptionalCapabilities()) {
41 final CParameters cparams = oc.getCParameters();
42 if (cparams != null) {
43 final As4BytesCapability as4 = cparams.getAs4BytesCapability();
45 return as4.getAsNumber();
51 // Fallback to whatever is in the header
52 return new AsNumber(Uint32.valueOf(open.getMyAsNumber()));
56 * Extract AS from Container Node.
58 * @param dtc route container
59 * @param nid as node identifier
62 public static AsNumber extractAS(final DataContainerNode<?> dtc, final NodeIdentifier nid) {
63 final NormalizedNode<?, ?> as = NormalizedNodes.findNode(dtc, nid).orElse(null);
65 return new AsNumber((Uint32) as.getValue());