Priyanka B | e412a85 | 2015-11-14 17:29:06 +0530 | [diff] [blame] | 1 | /*
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| 2 | * Copyright 2015 Open Networking Laboratory
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 | package org.onosproject.bgpio.protocol.linkstate;
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| 17 |
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| 18 | import java.util.List;
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| 19 |
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| 20 | import org.jboss.netty.buffer.ChannelBuffer;
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| 21 | import org.onosproject.bgpio.exceptions.BGPParseException;
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| 22 | import org.onosproject.bgpio.protocol.BgpLinkLsNlri;
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| 23 | import org.onosproject.bgpio.protocol.NlriType;
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| 24 | import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4.PROTOCOLTYPE;
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| 25 | import org.onosproject.bgpio.types.BGPErrorType;
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| 26 | import org.onosproject.bgpio.types.BGPValueType;
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| 27 | import org.onosproject.bgpio.types.RouteDistinguisher;
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| 28 | import org.onosproject.bgpio.util.Constants;
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| 29 | import org.slf4j.Logger;
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| 30 | import org.slf4j.LoggerFactory;
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| 31 |
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| 32 | import com.google.common.base.MoreObjects;
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| 33 |
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| 34 | /**
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| 35 | * Implementation of Link LS NLRI.
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| 36 | */
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| 37 | public class BgpLinkLsNlriVer4 implements BgpLinkLsNlri {
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| 38 |
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| 39 | /*
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| 40 | * REFERENCE : draft-ietf-idr-ls-distribution-11
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| 41 | 0 1 2 3
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| 42 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 43 | +-+-+-+-+-+-+-+-+
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| 44 | | Protocol-ID |
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| 45 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 46 | | Identifier |
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| 47 | | (64 bits) |
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| 48 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 49 | // Local Node Descriptors (variable) //
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| 50 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 51 | // Remote Node Descriptors (variable) //
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| 52 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 53 | // Link Descriptors (variable) //
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| 54 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 55 |
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| 56 | Figure : The Link NLRI format
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| 57 | */
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| 58 | private static final Logger log = LoggerFactory.getLogger(BgpLinkLsNlriVer4.class);
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| 59 | public static final int LINK_NLRITYPE = 2;
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| 60 |
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| 61 | private BGPLinkLSIdentifier linkLSIdentifier;
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| 62 | private byte protocolId;
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| 63 | private long identifier;
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| 64 | private RouteDistinguisher routeDistinguisher;
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| 65 | private boolean isVpn;
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| 66 |
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| 67 | /**
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| 68 | * Initialize fields.
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| 69 | */
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| 70 | public BgpLinkLsNlriVer4() {
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| 71 | this.protocolId = 0;
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| 72 | this.identifier = 0;
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| 73 | this.linkLSIdentifier = null;
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| 74 | this.routeDistinguisher = null;
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| 75 | this.isVpn = false;
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| 76 | }
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| 77 |
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| 78 | /**
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| 79 | * Constructor to initialize parameters for BGP LinkLSNlri.
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| 80 | *
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| 81 | * @param protocolId protocol Id
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| 82 | * @param identifier field in BGP LinkLSNlri
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| 83 | * @param linkLSIdentifier link LS identifier
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| 84 | * @param routeDistinguisher route distinguisher from message
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| 85 | * @param isVpn vpn info availability in message
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| 86 | */
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| 87 | public BgpLinkLsNlriVer4(byte protocolId, long identifier, BGPLinkLSIdentifier linkLSIdentifier,
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| 88 | RouteDistinguisher routeDistinguisher, boolean isVpn) {
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| 89 | this.protocolId = protocolId;
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| 90 | this.identifier = identifier;
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| 91 | this.linkLSIdentifier = linkLSIdentifier;
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| 92 | this.routeDistinguisher = routeDistinguisher;
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| 93 | this.isVpn = isVpn;
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| 94 | }
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| 95 |
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| 96 | /**
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| 97 | * Reads from channelBuffer and parses Link LS Nlri.
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| 98 | *
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| 99 | * @param cb ChannelBuffer
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| 100 | * @param afi Address Family Identifier
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| 101 | * @param safi Subsequent Address Family Identifier
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| 102 | * @return object of this class
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| 103 | * @throws BGPParseException while parsing Link LS NLRI
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| 104 | */
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| 105 | public static BgpLinkLsNlriVer4 read(ChannelBuffer cb, short afi, byte safi) throws BGPParseException {
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| 106 | boolean isVpn = false;
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| 107 | RouteDistinguisher routeDistinguisher = null;
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| 108 | if ((afi == Constants.AFI_VALUE) && (safi == Constants.VPN_SAFI_VALUE)) {
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| 109 | routeDistinguisher = new RouteDistinguisher();
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| 110 | routeDistinguisher = RouteDistinguisher.read(cb);
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| 111 | isVpn = true;
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| 112 | } else {
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| 113 | isVpn = false;
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| 114 | }
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| 115 | byte protocolId = cb.readByte();
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| 116 | long identifier = cb.readLong();
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| 117 |
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| 118 | BGPLinkLSIdentifier linkLSIdentifier = new BGPLinkLSIdentifier();
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| 119 | linkLSIdentifier = BGPLinkLSIdentifier.parseLinkIdendifier(cb, protocolId);
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| 120 | return new BgpLinkLsNlriVer4(protocolId, identifier, linkLSIdentifier, routeDistinguisher, isVpn);
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| 121 | }
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| 122 |
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| 123 | @Override
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| 124 | public NlriType getNlriType() {
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| 125 | return NlriType.LINK;
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| 126 | }
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| 127 |
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| 128 | @Override
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| 129 | public long getIdentifier() {
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| 130 | return this.identifier;
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| 131 | }
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| 132 |
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| 133 | /**
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| 134 | * Set the link LS identifier.
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| 135 | *
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| 136 | * @param linkLSIdentifier link LS identifier to set
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| 137 | */
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| 138 | public void setLinkLSIdentifier(BGPLinkLSIdentifier linkLSIdentifier) {
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| 139 | this.linkLSIdentifier = linkLSIdentifier;
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| 140 | }
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| 141 |
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| 142 | @Override
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| 143 | public PROTOCOLTYPE getProtocolId() throws BGPParseException {
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| 144 | switch (protocolId) {
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| 145 | case Constants.ISIS_LEVELONE:
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| 146 | return PROTOCOLTYPE.ISIS_LevelOne;
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| 147 | case Constants.ISIS_LEVELTWO:
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| 148 | return PROTOCOLTYPE.ISIS_LevelTwo;
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| 149 | case Constants.OSPFV2:
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| 150 | return PROTOCOLTYPE.OSPFv2;
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| 151 | case Constants.DIRECT:
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| 152 | return PROTOCOLTYPE.Direct;
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| 153 | case Constants.STATIC_CONFIGURATION:
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| 154 | return PROTOCOLTYPE.Static_Configuration;
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| 155 | case Constants.OSPFV3:
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| 156 | return PROTOCOLTYPE.OSPFv3;
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| 157 | default:
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| 158 | throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, (byte) 0, null);
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | @Override
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| 163 | public NodeDescriptors localNodeDescriptors() {
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| 164 | return this.linkLSIdentifier.localNodeDescriptors();
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| 165 | }
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| 166 |
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| 167 | @Override
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| 168 | public NodeDescriptors remoteNodeDescriptors() {
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| 169 | return this.linkLSIdentifier.remoteNodeDescriptors();
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| 170 | }
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| 171 |
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| 172 | /**
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| 173 | * Returns whether VPN is present or not.
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| 174 | *
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| 175 | * @return whether VPN is present or not
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| 176 | */
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| 177 | public boolean isVpnPresent() {
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| 178 | return this.isVpn;
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| 179 | }
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| 180 |
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| 181 | @Override
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| 182 | public RouteDistinguisher getRouteDistinguisher() {
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| 183 | return this.routeDistinguisher;
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| 184 | }
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| 185 |
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| 186 | /**
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| 187 | * Returns link identifier.
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| 188 | *
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| 189 | * @return link identifier
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| 190 | */
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| 191 | public BGPLinkLSIdentifier getLinkIdentifier() {
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| 192 | return this.linkLSIdentifier;
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| 193 | }
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| 194 |
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| 195 | @Override
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| 196 | public List<BGPValueType> linkDescriptors() {
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| 197 | return this.linkLSIdentifier.linkDescriptors();
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| 198 | }
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| 199 |
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| 200 | @Override
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| 201 | public String toString() {
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| 202 | return MoreObjects.toStringHelper(getClass())
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| 203 | .omitNullValues()
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| 204 | .add("protocolId", protocolId)
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| 205 | .add("identifier", identifier)
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| 206 | .add("RouteDistinguisher ", routeDistinguisher)
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| 207 | .add("linkLSIdentifier", linkLSIdentifier)
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| 208 | .toString();
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| 209 | }
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| 210 | } |