Kiran Ramachandra | e8699cd | 2016-02-17 17:15:21 +0530 | [diff] [blame] | 1 | /* |
Brian O'Connor | 5ab426f | 2016-04-09 01:19:45 -0700 | [diff] [blame^] | 2 | * Copyright 2016-present Open Networking Laboratory |
Kiran Ramachandra | e8699cd | 2016-02-17 17:15:21 +0530 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.ospf.controller.impl; |
| 18 | |
| 19 | import org.apache.felix.scr.annotations.Reference; |
| 20 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 21 | import org.jboss.netty.channel.Channel; |
| 22 | import org.jboss.netty.channel.ChannelFuture; |
| 23 | import org.jboss.netty.channel.ChannelHandlerContext; |
| 24 | import org.jboss.netty.channel.ChannelStateEvent; |
| 25 | import org.jboss.netty.channel.ExceptionEvent; |
| 26 | import org.jboss.netty.channel.MessageEvent; |
| 27 | import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler; |
| 28 | import org.jboss.netty.handler.timeout.ReadTimeoutException; |
| 29 | import org.onlab.packet.Ip4Address; |
| 30 | import org.onosproject.ospf.controller.LsaWrapper; |
| 31 | import org.onosproject.ospf.controller.OspfArea; |
| 32 | import org.onosproject.ospf.controller.OspfInterface; |
| 33 | import org.onosproject.ospf.controller.OspfLinkTed; |
| 34 | import org.onosproject.ospf.controller.OspfLsa; |
| 35 | import org.onosproject.ospf.controller.OspfNbr; |
| 36 | import org.onosproject.ospf.controller.OspfNeighborState; |
| 37 | import org.onosproject.ospf.controller.OspfRouter; |
| 38 | import org.onosproject.ospf.controller.TopologyForDeviceAndLink; |
| 39 | import org.onosproject.ospf.controller.area.OspfAreaImpl; |
| 40 | import org.onosproject.ospf.controller.area.OspfInterfaceImpl; |
| 41 | import org.onosproject.ospf.controller.lsdb.LsaWrapperImpl; |
| 42 | import org.onosproject.ospf.controller.lsdb.OspfLsdbImpl; |
| 43 | import org.onosproject.ospf.controller.util.OspfEligibleRouter; |
| 44 | import org.onosproject.ospf.controller.util.OspfInterfaceType; |
| 45 | import org.onosproject.ospf.exceptions.OspfParseException; |
| 46 | import org.onosproject.ospf.protocol.lsa.LsaHeader; |
| 47 | import org.onosproject.ospf.protocol.ospfpacket.OspfMessage; |
| 48 | import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader; |
| 49 | import org.onosproject.ospf.protocol.ospfpacket.subtype.LsRequestPacket; |
| 50 | import org.onosproject.ospf.protocol.ospfpacket.types.DdPacket; |
| 51 | import org.onosproject.ospf.protocol.ospfpacket.types.HelloPacket; |
| 52 | import org.onosproject.ospf.protocol.ospfpacket.types.LsAcknowledge; |
| 53 | import org.onosproject.ospf.protocol.ospfpacket.types.LsRequest; |
| 54 | import org.onosproject.ospf.protocol.ospfpacket.types.LsUpdate; |
| 55 | import org.onosproject.ospf.protocol.util.ChecksumCalculator; |
| 56 | import org.onosproject.ospf.protocol.util.OspfInterfaceState; |
| 57 | import org.onosproject.ospf.protocol.util.OspfPacketType; |
| 58 | import org.onosproject.ospf.protocol.util.OspfParameters; |
| 59 | import org.onosproject.ospf.protocol.util.OspfUtil; |
| 60 | import org.slf4j.Logger; |
| 61 | import org.slf4j.LoggerFactory; |
| 62 | |
| 63 | import java.io.IOException; |
| 64 | import java.nio.channels.ClosedChannelException; |
| 65 | import java.util.ArrayList; |
| 66 | import java.util.HashMap; |
| 67 | import java.util.Iterator; |
| 68 | import java.util.List; |
| 69 | import java.util.ListIterator; |
| 70 | import java.util.Set; |
| 71 | import java.util.concurrent.Executors; |
| 72 | import java.util.concurrent.RejectedExecutionException; |
| 73 | import java.util.concurrent.ScheduledExecutorService; |
| 74 | import java.util.concurrent.ScheduledFuture; |
| 75 | import java.util.concurrent.TimeUnit; |
| 76 | |
| 77 | /** |
| 78 | * Channel handler deals with the OSPF channel connection. |
| 79 | * Also it dispatches messages to the appropriate handlers. |
| 80 | */ |
| 81 | public class OspfInterfaceChannelHandler extends IdleStateAwareChannelHandler { |
| 82 | |
| 83 | private static final Logger log = |
| 84 | LoggerFactory.getLogger(OspfInterfaceChannelHandler.class); |
| 85 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 86 | private OspfInterface ospfInterface; |
| 87 | private OspfArea ospfArea; |
| 88 | private boolean isClosed = false; |
| 89 | private Controller controller; |
| 90 | private Channel channel; |
| 91 | private long delay = 0; |
| 92 | private InternalHelloTimer helloTimerTask; |
| 93 | private InternalWaitTimer waitTimerTask; |
| 94 | private InternalDelayedAckTimer delayedAckTimerTask; |
| 95 | private ScheduledExecutorService exServiceHello; |
| 96 | private ScheduledExecutorService exServiceWait; |
| 97 | private ScheduledExecutorService exServiceDelayedAck; |
| 98 | private boolean isDelayedAckTimerScheduled = false; |
| 99 | private int delayedAckTimerInterval = 2500; |
| 100 | private TopologyForDeviceAndLink topologyForDeviceAndLink; |
| 101 | |
| 102 | public OspfInterfaceChannelHandler() { |
| 103 | |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Creates an instance of OSPF channel handler. |
| 108 | * |
| 109 | * @param controller controller instance |
| 110 | * @param ospfArea ospf area instance |
| 111 | * @param ospfInterface ospf interface instance |
| 112 | */ |
| 113 | public OspfInterfaceChannelHandler(Controller controller, OspfArea ospfArea, OspfInterface ospfInterface) { |
| 114 | |
| 115 | this.ospfArea = ospfArea; |
| 116 | this.ospfInterface = ospfInterface; |
| 117 | this.controller = controller; |
| 118 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DOWN); |
| 119 | this.ospfInterface.setDr(Ip4Address.valueOf("0.0.0.0")); |
| 120 | this.ospfInterface.setBdr(Ip4Address.valueOf("0.0.0.0")); |
| 121 | this.topologyForDeviceAndLink = new TopologyForDeviceAndLinkImpl(); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Represents an interface is up and connected. |
| 126 | * |
| 127 | * @throws Exception might throws exception |
| 128 | */ |
| 129 | public void interfaceUp() throws Exception { |
| 130 | log.debug("OSPFInterfaceChannelHandler::interfaceUp...!!!"); |
| 131 | if (ospfInterface.interfaceType() == OspfInterfaceType.POINT_TO_POINT.value()) { |
| 132 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.POINT2POINT); |
| 133 | log.debug("OSPFInterfaceChannelHandler::InterfaceType {} state {} ", |
| 134 | ospfInterface.interfaceType(), ((OspfInterfaceImpl) ospfInterface).state()); |
| 135 | } else if (ospfInterface.interfaceType() == OspfInterfaceType.BROADCAST.value()) { |
| 136 | //if router priority is 0, move the state to DROther |
| 137 | if (ospfInterface.routerPriority() == 0) { |
| 138 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DROTHER); |
| 139 | } else { |
| 140 | log.debug("OSPFInterfaceChannelHandler::InterfaceType {} state {} RouterPriority {}", |
| 141 | ospfInterface.interfaceType(), |
| 142 | ((OspfInterfaceImpl) ospfInterface).state(), ospfInterface.routerPriority()); |
| 143 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.WAITING); |
| 144 | //start wait timer - like inactivity timer with router deadInterval |
| 145 | startWaitTimer(); |
| 146 | } |
| 147 | |
| 148 | } |
| 149 | // Start hello timer with interval from config - convert seconds to milliseconds |
| 150 | startHelloTimer(ospfInterface.helloIntervalTime()); |
| 151 | ospfArea.refreshArea(ospfInterface); |
| 152 | } |
| 153 | |
| 154 | |
| 155 | /** |
| 156 | * Gets called when a BDR was detected before the wait timer expired. |
| 157 | * |
| 158 | * @param ch channel instance |
| 159 | * @throws Exception might throws exception |
| 160 | */ |
| 161 | public void backupSeen(Channel ch) throws Exception { |
| 162 | log.debug("OSPFInterfaceChannelHandler::backupSeen "); |
| 163 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.WAITING) { |
| 164 | electRouter(ch); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Gets called when no hello message received for particular period. |
| 170 | * |
| 171 | * @param ch channel instance |
| 172 | * @throws Exception might throws exception |
| 173 | */ |
| 174 | public void waitTimer(Channel ch) throws Exception { |
| 175 | log.debug("OSPFInterfaceChannelHandler::waitTimer "); |
| 176 | //section 9.4 |
| 177 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.WAITING) { |
| 178 | electRouter(ch); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Neighbor change event is triggered when the router priority gets changed. |
| 184 | * |
| 185 | * @throws Exception might throws exception |
| 186 | */ |
| 187 | public void neighborChange() throws Exception { |
| 188 | log.debug("OSPFInterfaceChannelHandler::neighborChange "); |
| 189 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DR || |
| 190 | ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.BDR || |
| 191 | ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DROTHER) { |
| 192 | electRouter(channel); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Gets called when an interface is down. |
| 198 | * All interface variables are reset, and interface timers disabled. |
| 199 | * Also all neighbor connections associated with the interface are destroyed. |
| 200 | */ |
| 201 | public void interfaceDown() { |
| 202 | log.debug("OSPFInterfaceChannelHandler::interfaceDown "); |
| 203 | stopHelloTimer(); |
| 204 | ospfInterface.listOfNeighbors().clear(); |
| 205 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DOWN); |
| 206 | } |
| 207 | |
| 208 | @Override |
| 209 | public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent evt) throws Exception { |
| 210 | log.info("OSPF channelConnected from {}", evt.getChannel().getRemoteAddress()); |
| 211 | channel = evt.getChannel(); |
| 212 | interfaceUp(); |
| 213 | startDelayedAckTimer(); |
| 214 | } |
| 215 | |
| 216 | @Override |
| 217 | public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent evt) { |
| 218 | interfaceDown(); |
| 219 | stopDelayedAckTimer(); |
| 220 | log.debug("OspfChannelHandler::channelDisconnected...!!!"); |
| 221 | } |
| 222 | |
| 223 | @Override |
| 224 | public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { |
| 225 | log.info("[exceptionCaught]: " + e.toString()); |
| 226 | if (e.getCause() instanceof ReadTimeoutException) { |
| 227 | // device timeout |
| 228 | log.error("Disconnecting device {} due to read timeout", e.getChannel().getRemoteAddress()); |
| 229 | return; |
| 230 | } else if (e.getCause() instanceof ClosedChannelException) { |
| 231 | log.debug("Channel for OSPF {} already closed", e.getChannel().getRemoteAddress()); |
| 232 | } else if (e.getCause() instanceof IOException) { |
| 233 | log.error("Disconnecting OSPF {} due to IO Error: {}", e.getChannel().getRemoteAddress(), |
| 234 | e.getCause().getMessage()); |
| 235 | if (log.isDebugEnabled()) { |
| 236 | log.debug("StackTrace for previous Exception: {}", e.getCause()); |
| 237 | } |
| 238 | } else if (e.getCause() instanceof OspfParseException) { |
| 239 | OspfParseException errMsg = (OspfParseException) e.getCause(); |
| 240 | byte errorCode = errMsg.errorCode(); |
| 241 | byte errorSubCode = errMsg.errorSubCode(); |
| 242 | log.error("Error while parsing message from OSPF {}, ErrorCode {}", |
| 243 | e.getChannel().getRemoteAddress(), errorCode); |
| 244 | } else if (e.getCause() instanceof RejectedExecutionException) { |
| 245 | log.warn("Could not process message: queue full"); |
| 246 | } else { |
| 247 | log.error("Error while processing message from OSPF {}, state {}", |
| 248 | e.getChannel().getRemoteAddress(), ((OspfInterfaceImpl) ospfInterface).state()); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | @Override |
| 253 | public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception { |
| 254 | log.debug("OspfChannelHandler::messageReceived...!!!"); |
| 255 | Object message = e.getMessage(); |
| 256 | if (message instanceof List) { |
| 257 | List<OspfMessage> ospfMessageList = (List<OspfMessage>) message; |
| 258 | log.debug("OspfChannelHandler::List of OspfMessages Size {}", ospfMessageList.size()); |
| 259 | if (ospfMessageList != null) { |
| 260 | for (OspfMessage ospfMessage : ospfMessageList) { |
sunish vk | aa48da8 | 2016-03-02 23:17:06 +0530 | [diff] [blame] | 261 | processOspfMessage(ospfMessage, ctx); |
Kiran Ramachandra | e8699cd | 2016-02-17 17:15:21 +0530 | [diff] [blame] | 262 | } |
| 263 | } else { |
| 264 | log.debug("OspfChannelHandler::OspfMessages Null List...!!"); |
| 265 | } |
| 266 | } |
| 267 | if (message instanceof OspfMessage) { |
| 268 | OspfMessage ospfMessage = (OspfMessage) message; |
| 269 | log.debug("OspfChannelHandler::OspfMessages received...!!"); |
sunish vk | aa48da8 | 2016-03-02 23:17:06 +0530 | [diff] [blame] | 270 | processOspfMessage(ospfMessage, ctx); |
Kiran Ramachandra | e8699cd | 2016-02-17 17:15:21 +0530 | [diff] [blame] | 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * When an OSPF message received it is handed over to this method. |
| 276 | * Based on the type of the OSPF message received it will be handed over |
| 277 | * to corresponding message handler methods. |
| 278 | * |
| 279 | * @param ospfMessage received OSPF message |
| 280 | * @param ctx channel handler context instance. |
| 281 | * @throws Exception might throws exception |
| 282 | */ |
sunish vk | aa48da8 | 2016-03-02 23:17:06 +0530 | [diff] [blame] | 283 | public void processOspfMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 284 | log.debug("OspfChannelHandler::processOspfMessage...!!!"); |
Kiran Ramachandra | e8699cd | 2016-02-17 17:15:21 +0530 | [diff] [blame] | 285 | |
| 286 | if (!validateMessage(ospfMessage)) { |
| 287 | return; |
| 288 | } |
| 289 | |
| 290 | switch (ospfMessage.ospfMessageType().value()) { |
| 291 | case OspfParameters.HELLO: |
| 292 | processHelloMessage(ospfMessage, ctx); |
| 293 | break; |
| 294 | case OspfParameters.DD: |
| 295 | processDdMessage(ospfMessage, ctx); |
| 296 | break; |
| 297 | case OspfParameters.LSREQUEST: |
| 298 | processLsRequestMessage(ospfMessage, ctx); |
| 299 | break; |
| 300 | case OspfParameters.LSUPDATE: |
| 301 | processLsUpdateMessage(ospfMessage, ctx); |
| 302 | break; |
| 303 | case OspfParameters.LSACK: |
| 304 | processLsAckMessage(ospfMessage, ctx); |
| 305 | break; |
| 306 | default: |
| 307 | log.debug("Unknown packet to process...!!!"); |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * Validates the OSPF message received. |
| 314 | * |
| 315 | * @param ospfMessage OSPF message. |
| 316 | * @return true if it is a valid else false. |
| 317 | * @throws Exception might throws exception |
| 318 | */ |
| 319 | private boolean validateMessage(OspfMessage ospfMessage) throws Exception { |
| 320 | boolean isValid = true; |
| 321 | OspfPacketHeader header = (OspfPacketHeader) ospfMessage; |
| 322 | |
| 323 | //added the check to eliminate self origin packets also two interfaces on same router. |
| 324 | if (!header.sourceIp().equals(ospfInterface.ipAddress()) && !header.routerId().equals( |
| 325 | ospfArea.routerId())) { |
| 326 | //Verify the checksum |
| 327 | ChecksumCalculator checksum = new ChecksumCalculator(); |
| 328 | if (!checksum.isValidOspfCheckSum(ospfMessage, OspfUtil.OSPFPACKET_CHECKSUM_POS1, |
| 329 | OspfUtil.OSPFPACKET_CHECKSUM_POS2)) { |
| 330 | log.debug("Checksum mismatch. Received packet type {} ", ospfMessage.ospfMessageType()); |
| 331 | return false; |
| 332 | } |
| 333 | if (((OspfPacketHeader) ospfMessage).ospfVersion() != OspfUtil.OSPF_VERSION_2) { |
| 334 | log.debug("Received osfpMessage Version should match with Interface Version "); |
| 335 | return false; |
| 336 | } |
| 337 | if (!((OspfPacketHeader) ospfMessage).areaId().equals(ospfArea.areaId())) { |
| 338 | log.debug("Received ospf packets are from different area than our Area ID. " + |
| 339 | "Received Area ID {}, Our AreaId {} ", |
| 340 | ((OspfPacketHeader) ospfMessage).areaId(), ospfArea.areaId()); |
| 341 | return false; |
| 342 | } |
| 343 | |
| 344 | //According to RFC-2328 (8.2) |
| 345 | /** |
| 346 | * ABR should receive packets from backbone 0.0.0.0 as we are not acting as ABR |
| 347 | * we are rejecting the packet. |
| 348 | */ |
| 349 | if (((OspfPacketHeader) ospfMessage).areaId().equals(Ip4Address.valueOf("0.0.0.0"))) { |
| 350 | log.debug("ABR should receive packets from backbone 0.0.0.0 as we are not acting as " + |
| 351 | "ABR we are rejecting the ospf packet"); |
| 352 | return false; |
| 353 | } |
| 354 | if (ospfInterface.interfaceType() == OspfInterfaceType.BROADCAST.value() && |
| 355 | !OspfUtil.sameNetwork(((OspfPacketHeader) ospfMessage).sourceIp(), |
| 356 | ospfInterface.ipAddress(), ospfInterface.ipNetworkMask())) { |
| 357 | log.debug("Received packets from different subnets. Discarding...!!!"); |
| 358 | return false; |
| 359 | } |
| 360 | } else { |
| 361 | isValid = false; |
| 362 | } |
| 363 | |
| 364 | return isValid; |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * Processes Hello message. |
| 369 | * |
| 370 | * @param ospfMessage OSPF message instance. |
| 371 | * @param ctx context instance. |
| 372 | * @throws Exception might throws exception |
| 373 | */ |
| 374 | void processHelloMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 375 | log.debug("OspfChannelHandler::processHelloMessage...!!!"); |
| 376 | HelloPacket helloPacket = (HelloPacket) ospfMessage; |
| 377 | |
| 378 | // processing of hello packet as per RFC 2328 section 10.5 |
| 379 | log.debug("OspfChannelHandler::processHelloMessage::Interface Type {} OSPFInterfaceState {} ", |
| 380 | ospfInterface.interfaceType(), ((OspfInterfaceImpl) ospfInterface).state()); |
| 381 | |
| 382 | if (ospfInterface.interfaceType() != OspfInterfaceType.POINT_TO_POINT.value()) { |
| 383 | if (!helloPacket.networkMask().equals(ospfInterface.ipNetworkMask())) { |
| 384 | log.debug("OspfChannelHandler::processHelloMessage::Hello Packet Received does not " + |
| 385 | "match the same network mask as the configure Interface"); |
| 386 | return; |
| 387 | } |
| 388 | } |
| 389 | if (helloPacket.helloInterval() != ospfInterface.helloIntervalTime()) { |
| 390 | log.debug("OspfChannelHandler::processHelloMessage::Hello Packet Received have the same " + |
| 391 | "hello interval as configured Interface"); |
| 392 | return; |
| 393 | } |
| 394 | if (helloPacket.routerDeadInterval() != ospfInterface.routerDeadIntervalTime()) { |
| 395 | log.debug("OspfChannelHandler::processHelloMessage::Hello Packet Received have the same " + |
| 396 | "Router Dead interval as configured Interface"); |
| 397 | return; |
| 398 | } |
| 399 | |
| 400 | if (ospfInterface.interfaceType() == OspfInterfaceType.POINT_TO_POINT.value()) { |
| 401 | // to verify if the neighbor which sent the hello is present in the OSPF Interface neighboring list . |
| 402 | OspfNbr nbr; |
| 403 | if (!ospfInterface.isNeighborInList(helloPacket.routerId().toString())) { |
| 404 | nbr = new OspfNbrImpl(ospfArea, ospfInterface, helloPacket.sourceIp(), |
| 405 | helloPacket.routerId(), helloPacket.options(), this, topologyForDeviceAndLink); |
| 406 | ospfInterface.addNeighbouringRouter(nbr); |
| 407 | } else { |
| 408 | nbr = ospfInterface.neighbouringRouter(helloPacket.routerId().toString()); |
| 409 | nbr.setRouterPriority(helloPacket.routerPriority()); |
| 410 | } |
| 411 | if (!helloPacket.containsNeighbour(ospfArea.routerId())) { |
| 412 | ((OspfNbrImpl) nbr).oneWayReceived(helloPacket, channel); |
| 413 | } else { |
| 414 | ((OspfNbrImpl) nbr).twoWayReceived(helloPacket, ctx.getChannel()); |
| 415 | } |
| 416 | } else if (ospfInterface.interfaceType() == OspfInterfaceType.BROADCAST.value()) { |
| 417 | |
| 418 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.WAITING) { |
| 419 | if ((!helloPacket.dr().equals(Ip4Address.valueOf("0.0.0.0"))) && |
| 420 | (!helloPacket.bdr().equals(Ip4Address.valueOf("0.0.0.0")))) { |
| 421 | stopWaitTimer(); |
| 422 | ospfInterface.setDr(helloPacket.dr()); |
| 423 | ospfInterface.setBdr(helloPacket.bdr()); |
| 424 | if (helloPacket.dr().equals(ospfInterface.ipAddress())) { |
| 425 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DR); |
| 426 | //refresh router Lsa |
| 427 | ospfArea.refreshArea(ospfInterface); |
| 428 | } else if (helloPacket.bdr().equals(ospfInterface.ipAddress())) { |
| 429 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.BDR); |
| 430 | //refresh router Lsa |
| 431 | ospfArea.refreshArea(ospfInterface); |
| 432 | } else { |
| 433 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DROTHER); |
| 434 | ospfArea.refreshArea(ospfInterface); |
| 435 | } |
| 436 | |
| 437 | } else if (!helloPacket.dr().equals(Ip4Address.valueOf("0.0.0.0")) || |
| 438 | !helloPacket.bdr().equals(Ip4Address.valueOf("0.0.0.0"))) { |
| 439 | ospfInterface.setDr(helloPacket.dr()); |
| 440 | ospfInterface.setBdr(helloPacket.bdr()); |
| 441 | } |
| 442 | Ip4Address sourceIp = helloPacket.sourceIp(); |
| 443 | OspfNbr nbr; |
| 444 | if (!ospfInterface.isNeighborInList(helloPacket.routerId().toString())) { |
| 445 | nbr = new OspfNbrImpl(ospfArea, ospfInterface, sourceIp, helloPacket.routerId(), |
| 446 | helloPacket.options(), this, topologyForDeviceAndLink); |
| 447 | nbr.setNeighborId(helloPacket.routerId()); |
| 448 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 449 | nbr.setNeighborDr(helloPacket.dr()); |
| 450 | nbr.setRouterPriority(helloPacket.routerPriority()); |
| 451 | ospfInterface.addNeighbouringRouter(nbr); |
| 452 | } else { |
| 453 | nbr = ospfInterface.neighbouringRouter(helloPacket.routerId().toString()); |
| 454 | nbr.setRouterPriority(helloPacket.routerPriority()); |
| 455 | } |
| 456 | if (!helloPacket.containsNeighbour(ospfArea.routerId())) { |
| 457 | ((OspfNbrImpl) nbr).oneWayReceived(helloPacket, channel); |
| 458 | } else { |
| 459 | ((OspfNbrImpl) nbr).twoWayReceived(helloPacket, ctx.getChannel()); |
| 460 | } |
| 461 | |
| 462 | if (helloPacket.dr().equals(sourceIp)) { |
| 463 | if (helloPacket.bdr().equals(Ip4Address.valueOf("0.0.0.0"))) { |
| 464 | // call backup seen |
| 465 | stopWaitTimer(); |
| 466 | backupSeen(ctx.getChannel()); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | if (helloPacket.bdr().equals(sourceIp)) { |
| 471 | // call backup seen |
| 472 | stopWaitTimer(); |
| 473 | backupSeen(ctx.getChannel()); |
| 474 | } |
| 475 | } else { |
| 476 | |
| 477 | if ((!helloPacket.dr().equals(Ip4Address.valueOf("0.0.0.0")) || |
| 478 | !helloPacket.bdr().equals(Ip4Address.valueOf("0.0.0.0"))) |
| 479 | && ospfInterface.routerPriority() == 0) { |
| 480 | ospfInterface.setDr(helloPacket.dr()); |
| 481 | ospfInterface.setBdr(helloPacket.bdr()); |
| 482 | } |
| 483 | //To verify if the neighbor which sent the hello is present in the OSPF Interface neighboring list . |
| 484 | Ip4Address sourceIp = helloPacket.sourceIp(); |
| 485 | OspfNbr nbr; |
| 486 | if (!ospfInterface.isNeighborInList(helloPacket.routerId().toString())) { |
| 487 | nbr = new OspfNbrImpl(ospfArea, ospfInterface, sourceIp, helloPacket.routerId(), |
| 488 | helloPacket.options(), this, topologyForDeviceAndLink); |
| 489 | nbr.setNeighborId(helloPacket.routerId()); |
| 490 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 491 | nbr.setNeighborDr(helloPacket.dr()); |
| 492 | nbr.setRouterPriority(helloPacket.routerPriority()); |
| 493 | ospfInterface.addNeighbouringRouter(nbr); |
| 494 | ((OspfNbrImpl) nbr).oneWayReceived(helloPacket, channel); |
| 495 | } else { |
| 496 | log.debug("OspfChannelHandler::NeighborInList::helloPacket.bdr(): {}, " + |
| 497 | "helloPacket.dr(): {}", helloPacket.bdr(), helloPacket.dr()); |
| 498 | nbr = ospfInterface.neighbouringRouter(helloPacket.routerId().toString()); |
| 499 | nbr.setRouterPriority(helloPacket.routerPriority()); |
| 500 | if (!helloPacket.containsNeighbour(ospfArea.routerId())) { |
| 501 | ((OspfNbrImpl) nbr).oneWayReceived(helloPacket, channel); |
| 502 | } else { |
| 503 | ((OspfNbrImpl) nbr).twoWayReceived(helloPacket, ctx.getChannel()); |
| 504 | } |
| 505 | if (nbr.routerPriority() != helloPacket.routerPriority()) { |
| 506 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 507 | nbr.setNeighborDr(helloPacket.dr()); |
| 508 | neighborChange(); |
| 509 | } |
| 510 | |
| 511 | |
| 512 | if (nbr.neighborIpAddr().equals(helloPacket.dr()) && |
| 513 | !(nbr.neighborIpAddr().equals(nbr.neighborDr()))) { |
| 514 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 515 | nbr.setNeighborDr(helloPacket.dr()); |
| 516 | neighborChange(); |
| 517 | } |
| 518 | |
| 519 | if (!(nbr.neighborIpAddr().equals(helloPacket.dr())) && |
| 520 | (nbr.neighborIpAddr().equals(nbr.neighborDr()))) { |
| 521 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 522 | nbr.setNeighborDr(helloPacket.dr()); |
| 523 | neighborChange(); |
| 524 | } |
| 525 | |
| 526 | if (nbr.neighborIpAddr().equals(helloPacket.bdr()) && |
| 527 | !(nbr.neighborIpAddr().equals(nbr.neighborBdr()))) { |
| 528 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 529 | nbr.setNeighborDr(helloPacket.dr()); |
| 530 | neighborChange(); |
| 531 | } |
| 532 | |
| 533 | if (!(nbr.neighborIpAddr().equals(helloPacket.bdr())) && |
| 534 | (nbr.neighborIpAddr().equals(nbr.neighborBdr()))) { |
| 535 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 536 | nbr.setNeighborDr(helloPacket.dr()); |
| 537 | neighborChange(); |
| 538 | } |
| 539 | |
| 540 | nbr.setNeighborBdr(helloPacket.bdr()); |
| 541 | nbr.setNeighborDr(helloPacket.dr()); |
| 542 | } |
| 543 | |
| 544 | } |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * process the DD message which received. |
| 550 | * |
| 551 | * @param ospfMessage OSPF message instance. |
| 552 | * @param ctx channel handler context instance |
| 553 | * @throws Exception might throws exception |
| 554 | */ |
| 555 | void processDdMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 556 | log.debug("OspfChannelHandler::processDdMessage...!!!"); |
| 557 | |
| 558 | DdPacket ddPacket = (DdPacket) ospfMessage; |
| 559 | log.debug("Got DD packet from {}", ddPacket.sourceIp()); |
| 560 | //check it is present in listOfNeighbors |
| 561 | Ip4Address neighbourId = ddPacket.routerId(); |
| 562 | OspfNbr nbr = ospfInterface.neighbouringRouter(neighbourId.toString()); |
| 563 | |
| 564 | if (nbr != null) { |
| 565 | log.debug("OspfChannelHandler::processDdMessage:: OSPFNeighborState {}", nbr.getState()); |
| 566 | // set options for the NBR |
| 567 | nbr.setIsOpaqueCapable(ddPacket.isOpaqueCapable()); |
| 568 | if (ddPacket.imtu() > ospfInterface.mtu()) { |
| 569 | log.debug("the MTU size is greater than the interface MTU"); |
| 570 | return; |
| 571 | } |
| 572 | if (nbr.getState() == OspfNeighborState.DOWN) { |
| 573 | return; |
| 574 | } |
| 575 | if (nbr.getState() == OspfNeighborState.ATTEMPT) { |
| 576 | return; |
| 577 | } |
| 578 | if (nbr.getState() == OspfNeighborState.TWOWAY) { |
| 579 | nbr.adjOk(channel); |
| 580 | return; |
| 581 | } |
| 582 | //if init is the state call twoWayReceived |
| 583 | if (nbr.getState() == OspfNeighborState.INIT) { |
| 584 | ((OspfNbrImpl) nbr).twoWayReceived(ddPacket, ctx.getChannel()); |
| 585 | } else if (nbr.getState() == OspfNeighborState.EXSTART) { |
| 586 | //get I,M,MS Bits |
| 587 | int initialize = ddPacket.isInitialize(); |
| 588 | int more = ddPacket.isMore(); |
| 589 | int masterOrSlave = ddPacket.isMaster(); |
| 590 | int options = ddPacket.options(); |
| 591 | nbr.setOptions(options); |
| 592 | |
| 593 | if (initialize == OspfUtil.INITIALIZE_SET && more == OspfUtil.MORE_SET && |
| 594 | masterOrSlave == OspfUtil.IS_MASTER) { |
| 595 | if (ddPacket.getLsaHeaderList().isEmpty()) { |
| 596 | if (OspfUtil.ipAddressToLong(ddPacket.routerId().toString()) > |
| 597 | OspfUtil.ipAddressToLong(ospfArea.routerId().toString())) { |
| 598 | nbr.setIsMaster(OspfUtil.IS_MASTER); |
| 599 | ((OspfNbrImpl) nbr).setLastDdPacket(ddPacket); |
| 600 | nbr.setDdSeqNum(ddPacket.sequenceNo()); |
| 601 | nbr.setOptions(ddPacket.options()); |
| 602 | ((OspfNbrImpl) nbr).negotiationDone(ddPacket, true, ddPacket.getLsaHeaderList(), |
| 603 | ctx.getChannel()); |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | if (initialize == OspfUtil.INITIALIZE_NOTSET && masterOrSlave == OspfUtil.NOT_MASTER) { |
| 608 | if (nbr.ddSeqNum() == ddPacket.sequenceNo()) { |
| 609 | if (OspfUtil.ipAddressToLong(ddPacket.routerId().toString()) < |
| 610 | OspfUtil.ipAddressToLong(ospfArea.routerId().toString())) { |
| 611 | ((OspfNbrImpl) nbr).setLastDdPacket(ddPacket); |
| 612 | nbr.setOptions(ddPacket.options()); |
| 613 | nbr.setDdSeqNum(nbr.ddSeqNum() + 1); |
| 614 | ((OspfNbrImpl) nbr).negotiationDone(ddPacket, false, ddPacket.getLsaHeaderList(), |
| 615 | ctx.getChannel()); |
| 616 | } |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | } else if (nbr.getState() == OspfNeighborState.EXCHANGE) { |
| 621 | //get I,M,MS Bits |
| 622 | log.debug("Neighbor state:: EXCHANGE"); |
| 623 | boolean isDuplicateDDPacket = compareDdPackets(ddPacket, ((OspfNbrImpl) nbr).lastDdPacket()); |
| 624 | int initialize = ddPacket.isInitialize(); |
| 625 | int more = ddPacket.isMore(); |
| 626 | int masterOrSlave = ddPacket.isMaster(); |
| 627 | int options = ddPacket.options(); |
| 628 | |
| 629 | if (!isDuplicateDDPacket) { |
| 630 | //if dd packet is not duplicate then continue |
| 631 | if (nbr.isMaster() != masterOrSlave) { |
| 632 | DdPacket newResPacket = |
| 633 | (DdPacket) ((OspfNbrImpl) nbr).seqNumMismatch("Master/Slave Inconsistency"); |
| 634 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 635 | log.debug("Sending back DDPacket to {}", ddPacket.sourceIp()); |
| 636 | ctx.getChannel().write(newResPacket); |
| 637 | } else if (initialize == 1) { |
| 638 | DdPacket newResPacket = |
| 639 | (DdPacket) ((OspfNbrImpl) nbr).seqNumMismatch("Initialize bit inconsistency"); |
| 640 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 641 | log.debug("Sending back DDPacket to {}", ddPacket.sourceIp()); |
| 642 | ctx.getChannel().write(newResPacket); |
| 643 | } else { |
| 644 | |
| 645 | if (masterOrSlave == OspfUtil.NOT_MASTER) { |
| 646 | if (ddPacket.sequenceNo() == nbr.ddSeqNum()) { |
| 647 | //Process the DD Packet |
| 648 | ((OspfNbrImpl) nbr).processDdPacket(false, ddPacket, ctx.getChannel()); |
| 649 | log.debug("Received DD Packet"); |
| 650 | } else { |
| 651 | DdPacket newResPacket = |
| 652 | (DdPacket) ((OspfNbrImpl) nbr).seqNumMismatch("Sequence Number Mismatch"); |
| 653 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 654 | log.debug("Sending back DDPacket to {}", ddPacket.sourceIp()); |
| 655 | ctx.getChannel().write(newResPacket); |
| 656 | } |
| 657 | } else { |
| 658 | //we are the slave |
| 659 | if (ddPacket.sequenceNo() == (nbr.ddSeqNum() + 1)) { |
| 660 | ((OspfNbrImpl) nbr).setLastDdPacket(ddPacket); |
| 661 | ((OspfNbrImpl) nbr).processDdPacket(true, ddPacket, ctx.getChannel()); |
| 662 | log.debug("Process DD Packet"); |
| 663 | } else { |
| 664 | DdPacket newResPacket = |
| 665 | (DdPacket) ((OspfNbrImpl) nbr).seqNumMismatch("options inconsistency"); |
| 666 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 667 | log.debug("Sending back DDPacket to {}", ddPacket.sourceIp()); |
| 668 | ctx.getChannel().write(newResPacket); |
| 669 | } |
| 670 | } |
| 671 | } |
| 672 | } else { |
| 673 | if (masterOrSlave == OspfUtil.NOT_MASTER) { |
| 674 | return; |
| 675 | } else { |
| 676 | DdPacket newResPacket = ((OspfNbrImpl) nbr).lastSentDdPacket(); |
| 677 | log.debug("Sending back DDPacket to {}", ddPacket.sourceIp()); |
| 678 | ctx.getChannel().write(newResPacket); |
| 679 | } |
| 680 | } |
| 681 | } else if (nbr.getState() == OspfNeighborState.LOADING || nbr.getState() == OspfNeighborState.FULL) { |
| 682 | //In case if we are slave then we have to send the last received DD Packet |
| 683 | int options = ddPacket.options(); |
| 684 | if (nbr.options() != options) { |
| 685 | OspfMessage newResPacket = ((OspfNbrImpl) nbr).seqNumMismatch("Initialize bit inconsistency"); |
| 686 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 687 | ctx.getChannel().write(newResPacket); |
| 688 | } else if (ddPacket.isInitialize() == OspfUtil.INITIALIZE_SET) { |
| 689 | OspfMessage newResPacket = ((OspfNbrImpl) nbr).seqNumMismatch("Initialize bit inconsistency"); |
| 690 | newResPacket.setDestinationIp(ddPacket.sourceIp()); |
| 691 | ctx.getChannel().write(newResPacket); |
| 692 | } |
| 693 | boolean isDuplicate = compareDdPackets(ddPacket, ((OspfNbrImpl) nbr).lastDdPacket()); |
| 694 | //we are master |
| 695 | if (nbr.isMaster() != OspfUtil.IS_MASTER) { |
| 696 | // check if the packet is duplicate, duplicates should be discarded by the master |
| 697 | if (isDuplicate) { |
| 698 | log.debug("received a duplicate DD packet"); |
| 699 | } |
| 700 | } else { |
| 701 | //The slave must respond to duplicates by repeating the last Database Description packet |
| 702 | //that it had sent. |
| 703 | if (isDuplicate) { |
| 704 | ddPacket.setDestinationIp(ddPacket.sourceIp()); |
| 705 | ctx.getChannel().write(((OspfNbrImpl) nbr).lastSentDdPacket()); |
| 706 | log.debug("Sending back the duplicate packet "); |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /** |
| 714 | * Process the Ls Request message. |
| 715 | * |
| 716 | * @param ospfMessage OSPF message instance. |
| 717 | * @param ctx channel handler context instance. |
| 718 | * @throws Exception might throws exception |
| 719 | */ |
| 720 | void processLsRequestMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 721 | log.debug("OspfChannelHandler::processLsRequestMessage...!!!"); |
| 722 | LsRequest lsrPacket = (LsRequest) ospfMessage; |
| 723 | OspfNbr nbr = ospfInterface.neighbouringRouter(lsrPacket.routerId().toString()); |
| 724 | |
| 725 | if (nbr.getState() == OspfNeighborState.EXCHANGE || nbr.getState() == OspfNeighborState.LOADING || |
| 726 | nbr.getState() == OspfNeighborState.FULL) { |
| 727 | |
| 728 | LsRequest reqMsg = (LsRequest) ospfMessage; |
| 729 | if (reqMsg.getLinkStateRequests().isEmpty()) { |
| 730 | log.debug("Received Link State Request Vector is Empty "); |
| 731 | return; |
| 732 | } else { |
| 733 | //Send the LsUpdate back |
| 734 | ListIterator<LsRequestPacket> listItr = reqMsg.getLinkStateRequests().listIterator(); |
| 735 | while (listItr.hasNext()) { |
| 736 | LsUpdate lsupdate = new LsUpdate(); |
| 737 | lsupdate.setOspfVer(OspfUtil.OSPF_VERSION); |
| 738 | lsupdate.setOspftype(OspfPacketType.LSUPDATE.value()); |
| 739 | lsupdate.setRouterId(ospfArea.routerId()); |
| 740 | lsupdate.setAreaId(ospfArea.areaId()); |
| 741 | lsupdate.setAuthType(OspfUtil.NOT_ASSIGNED); |
| 742 | lsupdate.setAuthentication(OspfUtil.NOT_ASSIGNED); |
| 743 | lsupdate.setOspfPacLength(OspfUtil.NOT_ASSIGNED); // to calculate packet length |
| 744 | lsupdate.setChecksum(OspfUtil.NOT_ASSIGNED); |
| 745 | |
| 746 | //limit to mtu |
| 747 | int currentLength = OspfUtil.OSPF_HEADER_LENGTH + OspfUtil.FOUR_BYTES; |
| 748 | int maxSize = ospfInterface.mtu() - |
| 749 | OspfUtil.LSA_HEADER_LENGTH; // subtract a normal IP header. |
| 750 | int noLsa = 0; |
| 751 | while (listItr.hasNext()) { |
| 752 | LsRequestPacket lsRequest = (LsRequestPacket) listItr.next(); |
| 753 | // to verify length of the LSA |
| 754 | LsaWrapper wrapper = ospfArea.getLsa(lsRequest.lsType(), lsRequest.linkStateId(), |
| 755 | lsRequest.ownRouterId()); |
| 756 | OspfLsa ospflsa = wrapper.ospfLsa(); |
| 757 | if ((currentLength + ((LsaWrapperImpl) wrapper).lsaHeader().lsPacketLen()) >= maxSize) { |
| 758 | listItr.previous(); |
| 759 | break; |
| 760 | } |
| 761 | if (ospflsa != null) { |
| 762 | lsupdate.addLsa(ospflsa); |
| 763 | noLsa++; |
| 764 | |
| 765 | currentLength = currentLength + ((LsaWrapperImpl) wrapper).lsaHeader().lsPacketLen(); |
| 766 | } else { |
| 767 | nbr.badLSReq(channel); |
| 768 | } |
| 769 | } |
| 770 | lsupdate.setNumberOfLsa(noLsa); |
| 771 | //set the destination |
| 772 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DR || |
| 773 | ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.BDR || |
| 774 | ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.POINT2POINT) { |
| 775 | lsupdate.setDestinationIp(OspfUtil.ALL_SPF_ROUTERS); |
| 776 | } else if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DROTHER) { |
| 777 | lsupdate.setDestinationIp(OspfUtil.ALL_DROUTERS); |
| 778 | } |
| 779 | ctx.getChannel().write(lsupdate); |
| 780 | } |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | /** |
| 786 | * Process the ls update message. |
| 787 | * |
| 788 | * @param ospfMessage OSPF message instance. |
| 789 | * @param ctx channel handler context instance. |
| 790 | * @throws Exception might throws exception |
| 791 | */ |
| 792 | void processLsUpdateMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 793 | log.debug("OspfChannelHandler::processLsUpdateMessage"); |
| 794 | LsUpdate lsUpdate = (LsUpdate) ospfMessage; |
| 795 | String neighbourId = lsUpdate.routerId().toString(); |
| 796 | //LSUpdate packet has been associated with a particular neighbor. |
| 797 | //Neighbor should not be in lesser state than Exchange. |
| 798 | if (ospfInterface.isNeighborInList(neighbourId)) { |
| 799 | OspfNbrImpl nbr = (OspfNbrImpl) ospfInterface.neighbouringRouter(neighbourId); |
| 800 | if (nbr.getState() == OspfNeighborState.EXCHANGE || |
| 801 | nbr.getState() == OspfNeighborState.LOADING) { |
| 802 | nbr.processLsUpdate(lsUpdate, ctx.getChannel()); |
| 803 | } else if (nbr.getState() == OspfNeighborState.FULL) { |
| 804 | if (lsUpdate.noLsa() != 0) { |
| 805 | List<OspfLsa> list = lsUpdate.getLsaList(); |
| 806 | Iterator itr = list.iterator(); |
| 807 | while (itr.hasNext()) { |
| 808 | LsaHeader lsa = (LsaHeader) itr.next(); |
| 809 | nbr.processReceivedLsa(lsa, true, ctx.getChannel(), lsUpdate.sourceIp()); |
| 810 | } |
| 811 | } else { |
| 812 | return; |
| 813 | } |
| 814 | } |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | /** |
| 819 | * Process the ls acknowledge message. |
| 820 | * |
| 821 | * @param ospfMessage OSPF message instance. |
| 822 | * @param ctx channel handler context instance. |
| 823 | * @throws Exception might throws exception |
| 824 | */ |
| 825 | void processLsAckMessage(OspfMessage ospfMessage, ChannelHandlerContext ctx) throws Exception { |
| 826 | log.debug("OspfChannelHandler::processLsAckMessage"); |
| 827 | LsAcknowledge lsAckPacket = (LsAcknowledge) ospfMessage; |
| 828 | //check it is present in listOfNeighbors |
| 829 | OspfNbrImpl nbr = (OspfNbrImpl) ospfInterface.neighbouringRouter(lsAckPacket.routerId().toString()); |
| 830 | if (nbr != null) { |
| 831 | if (nbr.getState().getValue() < OspfNeighborState.EXCHANGE.getValue()) { |
| 832 | // discard the packet. |
| 833 | return; |
| 834 | } else { |
| 835 | // process ls acknowledgements |
| 836 | Iterator itr = lsAckPacket.getLinkStateHeaders().iterator(); |
| 837 | while (itr.hasNext()) { |
| 838 | LsaHeader lsRequest = (LsaHeader) itr.next(); |
| 839 | |
| 840 | OspfLsa ospfLsa = |
| 841 | (OspfLsa) nbr.getPendingReTxList().get(((OspfAreaImpl) ospfArea).getLsaKey(lsRequest)); |
| 842 | if (lsRequest != null && ospfLsa != null) { |
| 843 | String isSame = ((OspfLsdbImpl) ospfArea.database()).isNewerOrSameLsa( |
| 844 | lsRequest, (LsaHeader) ospfLsa); |
| 845 | if (isSame.equals("same")) { |
| 846 | nbr.getPendingReTxList().remove(((OspfAreaImpl) ospfArea).getLsaKey(lsRequest)); |
| 847 | } |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | } |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * Compares two Dd Packets to check whether its duplicate or not. |
| 856 | * |
| 857 | * @param receivedDPacket received DD packet from network. |
| 858 | * @param lastDdPacket Last DdPacket which we sent. |
| 859 | * @return true if it is a duplicate packet else false. |
| 860 | */ |
| 861 | public boolean compareDdPackets(DdPacket receivedDPacket, DdPacket lastDdPacket) { |
| 862 | if (receivedDPacket.isInitialize() == lastDdPacket.isInitialize()) { |
| 863 | if (receivedDPacket.isMaster() == lastDdPacket.isMaster()) { |
| 864 | if (receivedDPacket.isMore() == lastDdPacket.isMore()) { |
| 865 | if (receivedDPacket.options() == lastDdPacket.options()) { |
| 866 | if (receivedDPacket.sequenceNo() == lastDdPacket.sequenceNo()) { |
| 867 | return true; |
| 868 | } |
| 869 | } |
| 870 | } |
| 871 | } |
| 872 | } |
| 873 | return false; |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * Closes the Netty channel. |
| 878 | * |
| 879 | * @param ctx the Channel Handler Context |
| 880 | */ |
| 881 | void closeChannel(ChannelHandlerContext ctx) { |
| 882 | log.debug("OspfChannelHandler::closeChannel"); |
| 883 | isClosed = true; |
| 884 | ctx.getChannel().close(); |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | * Starts the hello timer which sends hello packet every configured seconds. |
| 889 | * |
| 890 | * @param period the interval to run task |
| 891 | */ |
| 892 | private void startHelloTimer(long period) { |
| 893 | log.debug("OSPFInterfaceChannelHandler::startHelloTimer"); |
| 894 | exServiceHello = Executors.newSingleThreadScheduledExecutor(); |
| 895 | helloTimerTask = new InternalHelloTimer(); |
| 896 | final ScheduledFuture<?> helloHandle = |
| 897 | exServiceHello.scheduleAtFixedRate(helloTimerTask, delay, period, TimeUnit.SECONDS); |
| 898 | } |
| 899 | |
| 900 | /** |
| 901 | * Stops the hello timer. |
| 902 | */ |
| 903 | private void stopHelloTimer() { |
| 904 | log.debug("OSPFInterfaceChannelHandler::stopHelloTimer "); |
| 905 | exServiceHello.shutdown(); |
| 906 | } |
| 907 | |
| 908 | /** |
| 909 | * Starts the wait timer. |
| 910 | */ |
| 911 | private void startWaitTimer() { |
| 912 | log.debug("OSPFNbr::startWaitTimer"); |
| 913 | exServiceWait = Executors.newSingleThreadScheduledExecutor(); |
| 914 | waitTimerTask = new InternalWaitTimer(); |
| 915 | final ScheduledFuture<?> waitTimerHandle = |
| 916 | exServiceWait.schedule(waitTimerTask, ospfInterface.routerDeadIntervalTime(), |
| 917 | TimeUnit.SECONDS); |
| 918 | } |
| 919 | |
| 920 | /** |
| 921 | * Stops the wait timer. |
| 922 | */ |
| 923 | private void stopWaitTimer() { |
| 924 | log.debug("OSPFNbr::stopWaitTimer "); |
| 925 | exServiceWait.shutdown(); |
| 926 | } |
| 927 | |
| 928 | /** |
| 929 | * Starts the timer which waits for configured seconds and sends Delayed Ack Packet. |
| 930 | */ |
| 931 | private void startDelayedAckTimer() { |
| 932 | if (!isDelayedAckTimerScheduled) { |
| 933 | log.debug("Started DelayedAckTimer...!!!"); |
| 934 | exServiceDelayedAck = Executors.newSingleThreadScheduledExecutor(); |
| 935 | delayedAckTimerTask = new InternalDelayedAckTimer(); |
| 936 | final ScheduledFuture<?> delayAckHandle = |
| 937 | exServiceDelayedAck.scheduleAtFixedRate(delayedAckTimerTask, delayedAckTimerInterval, |
| 938 | delayedAckTimerInterval, TimeUnit.MILLISECONDS); |
| 939 | isDelayedAckTimerScheduled = true; |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | /** |
| 944 | * Stops the delayed acknowledge timer. |
| 945 | */ |
| 946 | private void stopDelayedAckTimer() { |
| 947 | if (isDelayedAckTimerScheduled) { |
| 948 | log.debug("Stopped DelayedAckTimer...!!!"); |
| 949 | isDelayedAckTimerScheduled = false; |
| 950 | exServiceDelayedAck.shutdown(); |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | /** |
| 955 | * Performs DR election. |
| 956 | * |
| 957 | * @param ch Netty Channel instance. |
| 958 | * @throws Exception might throws exception |
| 959 | */ |
| 960 | public void electRouter(Channel ch) throws Exception { |
| 961 | |
| 962 | Ip4Address currentDr = ospfInterface.dr(); |
| 963 | Ip4Address currentBdr = ospfInterface.bdr(); |
| 964 | OspfInterfaceState oldState = ((OspfInterfaceImpl) ospfInterface).state(); |
| 965 | OspfInterfaceState newState; |
| 966 | |
| 967 | log.debug("OSPFInterfaceChannelHandler::electRouter -> currentDr: {}, currentBdr: {}", |
| 968 | currentDr, currentBdr); |
| 969 | List<OspfEligibleRouter> eligibleRouters = calculateListOfEligibleRouters(new OspfEligibleRouter()); |
| 970 | |
| 971 | log.debug("OSPFInterfaceChannelHandler::electRouter -> eligibleRouters: {}", eligibleRouters); |
| 972 | OspfEligibleRouter electedBdr = electBdr(eligibleRouters); |
| 973 | OspfEligibleRouter electedDr = electDr(eligibleRouters, electedBdr); |
| 974 | |
| 975 | ospfInterface.setBdr(electedBdr.getIpAddress()); |
| 976 | ospfInterface.setDr(electedDr.getIpAddress()); |
| 977 | |
| 978 | if (electedBdr.getIpAddress().equals(ospfInterface.ipAddress()) && |
| 979 | !electedBdr.getIpAddress().equals(currentBdr)) { |
| 980 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.BDR); |
| 981 | } |
| 982 | |
| 983 | if (electedDr.getIpAddress().equals(ospfInterface.ipAddress()) && |
| 984 | !electedDr.getIpAddress().equals(currentDr)) { |
| 985 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DR); |
| 986 | } |
| 987 | |
| 988 | if (((OspfInterfaceImpl) ospfInterface).state() != oldState && |
| 989 | !(((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DROTHER && |
| 990 | oldState.value() < OspfInterfaceState.DROTHER.value())) { |
| 991 | log.debug("Recalculating as the State is changed "); |
| 992 | log.debug("OSPFInterfaceChannelHandler::electRouter -> currentDr: {}, currentBdr: {}", |
| 993 | currentDr, currentBdr); |
| 994 | eligibleRouters = calculateListOfEligibleRouters(new OspfEligibleRouter()); |
| 995 | |
| 996 | log.debug("OSPFInterfaceChannelHandler::electRouter -> eligibleRouters: {}", eligibleRouters); |
| 997 | electedBdr = electBdr(eligibleRouters); |
| 998 | electedDr = electDr(eligibleRouters, electedBdr); |
| 999 | |
| 1000 | ospfInterface.setBdr(electedBdr.getIpAddress()); |
| 1001 | ospfInterface.setDr(electedDr.getIpAddress()); |
| 1002 | } |
| 1003 | |
| 1004 | if (electedBdr.getIpAddress().equals(ospfInterface.ipAddress()) && |
| 1005 | !electedBdr.getIpAddress().equals(currentBdr)) { |
| 1006 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.BDR); |
| 1007 | ospfArea.refreshArea(ospfInterface); |
| 1008 | } |
| 1009 | |
| 1010 | if (electedDr.getIpAddress().equals(ospfInterface.ipAddress()) && |
| 1011 | !electedDr.getIpAddress().equals(currentDr)) { |
| 1012 | ((OspfInterfaceImpl) ospfInterface).setState(OspfInterfaceState.DR); |
| 1013 | //Refresh Router Lsa & Network Lsa |
| 1014 | ospfArea.refreshArea(ospfInterface); |
| 1015 | } |
| 1016 | |
| 1017 | if (currentDr != electedDr.getIpAddress() || currentBdr != electedBdr.getIpAddress()) { |
| 1018 | Set<String> negibhorIdList; |
| 1019 | negibhorIdList = ospfInterface.listOfNeighbors().keySet(); |
| 1020 | for (String routerid : negibhorIdList) { |
| 1021 | OspfNbrImpl nbr = (OspfNbrImpl) ospfInterface.neighbouringRouter(routerid); |
| 1022 | if (nbr.getState().getValue() >= OspfNeighborState.TWOWAY.getValue()) { |
| 1023 | nbr.adjOk(ch); |
| 1024 | } |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | log.debug("OSPFInterfaceChannelHandler::electRouter -> ElectedDR: {}, ElectedBDR: {}", |
| 1029 | electedDr.getIpAddress(), electedBdr.getIpAddress()); |
| 1030 | } |
| 1031 | |
| 1032 | |
| 1033 | /** |
| 1034 | * BDR Election process. Find the list of eligible router to participate in the process. |
| 1035 | * |
| 1036 | * @param electedDr router elected as DR. |
| 1037 | * @return list of eligible routers |
| 1038 | */ |
| 1039 | public List<OspfEligibleRouter> calculateListOfEligibleRouters(OspfEligibleRouter electedDr) { |
| 1040 | log.debug("OSPFNbr::calculateListOfEligibleRouters "); |
| 1041 | Set<String> neighborIdList; |
| 1042 | List<OspfEligibleRouter> eligibleRouters = new ArrayList<>(); |
| 1043 | |
| 1044 | neighborIdList = ospfInterface.listOfNeighbors().keySet(); |
| 1045 | for (String routerId : neighborIdList) { |
| 1046 | OspfNbrImpl nbr = (OspfNbrImpl) ospfInterface.neighbouringRouter(routerId); |
| 1047 | if (nbr.getState().getValue() >= OspfNeighborState.TWOWAY.getValue() && |
| 1048 | nbr.routerPriority() > 0) { |
| 1049 | OspfEligibleRouter router = new OspfEligibleRouter(); |
| 1050 | router.setIpAddress(nbr.neighborIpAddr()); |
| 1051 | router.setRouterId(nbr.neighborId()); |
| 1052 | router.setRouterPriority(nbr.routerPriority()); |
| 1053 | if (nbr.neighborDr().equals(nbr.neighborIpAddr()) || |
| 1054 | electedDr.getIpAddress().equals(nbr.neighborIpAddr())) { |
| 1055 | router.setIsDr(true); |
| 1056 | } else if (nbr.neighborBdr().equals(nbr.neighborIpAddr())) { |
| 1057 | router.setIsBdr(true); |
| 1058 | } |
| 1059 | eligibleRouters.add(router); |
| 1060 | } |
| 1061 | } |
| 1062 | // interface does not have states like two and all |
| 1063 | if (ospfInterface.routerPriority() > 0) { |
| 1064 | OspfEligibleRouter router = new OspfEligibleRouter(); |
| 1065 | router.setIpAddress(ospfInterface.ipAddress()); |
| 1066 | router.setRouterId(ospfArea.routerId()); |
| 1067 | router.setRouterPriority(ospfInterface.routerPriority()); |
| 1068 | if (ospfInterface.dr().equals(ospfInterface.ipAddress()) || |
| 1069 | electedDr.getIpAddress().equals(ospfInterface.ipAddress())) { |
| 1070 | router.setIsDr(true); |
| 1071 | } else if (ospfInterface.bdr().equals(ospfInterface.ipAddress()) && |
| 1072 | !ospfInterface.dr().equals(ospfInterface.ipAddress())) { |
| 1073 | router.setIsBdr(true); |
| 1074 | } |
| 1075 | |
| 1076 | eligibleRouters.add(router); |
| 1077 | } |
| 1078 | |
| 1079 | return eligibleRouters; |
| 1080 | } |
| 1081 | |
| 1082 | /** |
| 1083 | * Based on router priority assigns BDR. |
| 1084 | * |
| 1085 | * @param eligibleRouters list of routers to participate in bdr election. |
| 1086 | * @return OSPF Eligible router instance. |
| 1087 | */ |
| 1088 | public OspfEligibleRouter electBdr(List<OspfEligibleRouter> eligibleRouters) { |
| 1089 | log.debug("OSPFInterfaceChannelHandler::electBdr -> eligibleRouters: {}", eligibleRouters); |
| 1090 | List<OspfEligibleRouter> declaredAsBdr = new ArrayList<>(); |
| 1091 | List<OspfEligibleRouter> notDrAndBdr = new ArrayList<>(); |
| 1092 | for (OspfEligibleRouter router : eligibleRouters) { |
| 1093 | if (router.isBdr()) { |
| 1094 | declaredAsBdr.add(router); |
| 1095 | } |
| 1096 | if (!router.isBdr() && !router.isDr()) { |
| 1097 | notDrAndBdr.add(router); |
| 1098 | } |
| 1099 | } |
| 1100 | |
| 1101 | OspfEligibleRouter electedBdr = new OspfEligibleRouter(); |
| 1102 | if (!declaredAsBdr.isEmpty()) { |
| 1103 | if (declaredAsBdr.size() == 1) { |
| 1104 | electedBdr = declaredAsBdr.get(0); |
| 1105 | } else if (declaredAsBdr.size() > 1) { |
| 1106 | electedBdr = selectRouterBasedOnPriority(declaredAsBdr); |
| 1107 | } |
| 1108 | } else { |
| 1109 | if (notDrAndBdr.size() == 1) { |
| 1110 | electedBdr = notDrAndBdr.get(0); |
| 1111 | } else if (notDrAndBdr.size() > 1) { |
| 1112 | electedBdr = selectRouterBasedOnPriority(notDrAndBdr); |
| 1113 | } |
| 1114 | } |
| 1115 | |
| 1116 | electedBdr.setIsBdr(true); |
| 1117 | electedBdr.setIsDr(false); |
| 1118 | |
| 1119 | return electedBdr; |
| 1120 | } |
| 1121 | |
| 1122 | /** |
| 1123 | * DR Election process. |
| 1124 | * |
| 1125 | * @param eligibleRouters list of eligible routers. |
| 1126 | * @param electedBdr Elected Bdr, OSPF eligible router instance. |
| 1127 | * @return OSPF eligible router instance. |
| 1128 | */ |
| 1129 | public OspfEligibleRouter electDr(List<OspfEligibleRouter> eligibleRouters, |
| 1130 | OspfEligibleRouter electedBdr) { |
| 1131 | |
| 1132 | List<OspfEligibleRouter> declaredAsDr = new ArrayList<>(); |
| 1133 | for (OspfEligibleRouter router : eligibleRouters) { |
| 1134 | if (router.isDr()) { |
| 1135 | declaredAsDr.add(router); |
| 1136 | } |
| 1137 | } |
| 1138 | |
| 1139 | OspfEligibleRouter electedDr = new OspfEligibleRouter(); |
| 1140 | if (!declaredAsDr.isEmpty()) { |
| 1141 | if (declaredAsDr.size() == 1) { |
| 1142 | electedDr = declaredAsDr.get(0); |
| 1143 | } else if (eligibleRouters.size() > 1) { |
| 1144 | electedDr = selectRouterBasedOnPriority(declaredAsDr); |
| 1145 | } |
| 1146 | } else { |
| 1147 | electedDr = electedBdr; |
| 1148 | electedDr.setIsDr(true); |
| 1149 | electedDr.setIsBdr(false); |
| 1150 | } |
| 1151 | |
| 1152 | return electedDr; |
| 1153 | } |
| 1154 | |
| 1155 | /** |
| 1156 | * DR election process. |
| 1157 | * |
| 1158 | * @param routersList list of eligible routers. |
| 1159 | * @return OSPF eligible router instance. |
| 1160 | */ |
| 1161 | public OspfEligibleRouter selectRouterBasedOnPriority(List<OspfEligibleRouter> routersList) { |
| 1162 | |
| 1163 | OspfEligibleRouter initialRouter = routersList.get(0); |
| 1164 | |
| 1165 | for (int i = 1; i < routersList.size(); i++) { |
| 1166 | OspfEligibleRouter router = routersList.get(i); |
| 1167 | if (router.getRouterPriority() > initialRouter.getRouterPriority()) { |
| 1168 | initialRouter = router; |
| 1169 | } else if (router.getRouterPriority() == initialRouter.getRouterPriority()) { |
| 1170 | try { |
| 1171 | //if (router.getIpAddress().toInt() > initialRouter.getIpAddress().toInt()) { |
| 1172 | if (OspfUtil.ipAddressToLong(router.getIpAddress().toString()) > |
| 1173 | OspfUtil.ipAddressToLong(initialRouter.getIpAddress().toString())) { |
| 1174 | initialRouter = router; |
| 1175 | } |
| 1176 | } catch (Exception e) { |
| 1177 | log.debug("OSPFInterfaceChannelHandler::selectRouterBasedOnPriority ->" + |
| 1178 | " eligibleRouters: {}", initialRouter); |
| 1179 | } |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | return initialRouter; |
| 1184 | } |
| 1185 | |
| 1186 | /** |
| 1187 | * Adds device information. |
| 1188 | * |
| 1189 | * @param ospfRouter OSPF router instance |
| 1190 | */ |
| 1191 | public void addDeviceInformation(OspfRouter ospfRouter) { |
| 1192 | controller.addDeviceDetails(ospfRouter); |
| 1193 | } |
| 1194 | |
| 1195 | /** |
| 1196 | * removes device information. |
| 1197 | * |
| 1198 | * @param ospfRouter OSPF neighbor instance |
| 1199 | */ |
| 1200 | public void removeDeviceInformation(OspfRouter ospfRouter) { |
| 1201 | controller.removeDeviceDetails(ospfRouter); |
| 1202 | } |
| 1203 | |
| 1204 | /** |
| 1205 | * Adds link information. |
| 1206 | * |
| 1207 | * @param ospfRouter OSPF router instance |
| 1208 | * @param ospfLinkTed list link ted instances |
| 1209 | */ |
| 1210 | public void addLinkInformation(OspfRouter ospfRouter, OspfLinkTed ospfLinkTed) { |
| 1211 | controller.addLinkDetails(ospfRouter, ospfLinkTed); |
| 1212 | } |
| 1213 | |
| 1214 | /** |
| 1215 | * Removes link information. |
| 1216 | * |
| 1217 | * @param ospfNbr OSPF neighbor instance |
| 1218 | */ |
| 1219 | public void removeLinkInformation(OspfNbr ospfNbr) { |
| 1220 | controller.removeLinkDetails(buildOspfRouterDetails(ospfNbr)); |
| 1221 | } |
| 1222 | |
| 1223 | /** |
| 1224 | * Builds router details. |
| 1225 | * |
| 1226 | * @param ospfNbr OSPF neighbor instance |
| 1227 | * @return OSPF router instance |
| 1228 | */ |
| 1229 | private OspfRouter buildOspfRouterDetails(OspfNbr ospfNbr) { |
| 1230 | OspfRouter ospfRouter = new OspfRouterImpl(); |
| 1231 | ospfRouter.setRouterIp(ospfNbr.neighborId()); |
| 1232 | ospfRouter.setInterfaceId(ospfInterface.ipAddress()); |
| 1233 | ospfRouter.setAreaIdOfInterface(ospfArea.areaId()); |
| 1234 | |
| 1235 | ospfRouter.setDeviceTed(new OspfDeviceTedImpl()); |
| 1236 | |
| 1237 | return ospfRouter; |
| 1238 | } |
| 1239 | |
| 1240 | /** |
| 1241 | * Represents a Hello task which sent a hello message every configured time interval. |
| 1242 | */ |
| 1243 | private class InternalHelloTimer implements Runnable { |
| 1244 | |
| 1245 | /** |
| 1246 | * Creates an instance of Hello Timer. |
| 1247 | */ |
| 1248 | InternalHelloTimer() { |
| 1249 | } |
| 1250 | |
| 1251 | @Override |
| 1252 | public void run() { |
| 1253 | if (!isClosed && channel != null && channel.isOpen() && channel.isConnected()) { |
| 1254 | |
| 1255 | HelloPacket hellopacket = new HelloPacket(); |
| 1256 | //Headers |
| 1257 | hellopacket.setOspfVer(OspfUtil.OSPF_VERSION); |
| 1258 | hellopacket.setOspftype(OspfPacketType.HELLO.value()); |
| 1259 | hellopacket.setOspfPacLength(0); //will be modified while encoding |
| 1260 | hellopacket.setRouterId(ospfArea.routerId()); |
| 1261 | hellopacket.setAreaId(ospfArea.areaId()); |
| 1262 | hellopacket.setChecksum(0); //will be modified while encoding |
| 1263 | hellopacket.setAuthType(Integer.parseInt(ospfInterface.authType())); |
| 1264 | hellopacket.setAuthentication(Integer.parseInt(ospfInterface.authKey())); |
| 1265 | //Body |
| 1266 | hellopacket.setNetworkMask(ospfInterface.ipNetworkMask()); |
| 1267 | hellopacket.setOptions(ospfArea.options()); |
| 1268 | hellopacket.setHelloInterval(ospfInterface.helloIntervalTime()); |
| 1269 | hellopacket.setRouterPriority(ospfInterface.routerPriority()); |
| 1270 | hellopacket.setRouterDeadInterval(ospfInterface.routerDeadIntervalTime()); |
| 1271 | hellopacket.setDr(ospfInterface.dr()); |
| 1272 | hellopacket.setBdr(ospfInterface.bdr()); |
| 1273 | |
| 1274 | HashMap<String, OspfNbr> listOfNeighbors = ospfInterface.listOfNeighbors(); |
| 1275 | Set<String> keys = listOfNeighbors.keySet(); |
| 1276 | Iterator itr = keys.iterator(); |
| 1277 | while (itr.hasNext()) { |
| 1278 | String nbrKey = (String) itr.next(); |
| 1279 | OspfNbrImpl nbr = (OspfNbrImpl) listOfNeighbors.get(nbrKey); |
| 1280 | if (nbr.getState() != OspfNeighborState.DOWN) { |
| 1281 | hellopacket.addNeighbor(Ip4Address.valueOf(nbrKey)); |
| 1282 | } |
| 1283 | } |
| 1284 | // build a hello Packet |
| 1285 | if (channel == null || !channel.isOpen() || !channel.isConnected()) { |
| 1286 | log.debug("Hello Packet not sent !!.. Channel Issue..."); |
| 1287 | return; |
| 1288 | } |
| 1289 | |
| 1290 | hellopacket.setDestinationIp(OspfUtil.ALL_SPF_ROUTERS); |
| 1291 | ChannelFuture future = channel.write(hellopacket); |
| 1292 | if (future.isSuccess()) { |
| 1293 | log.debug("Hello Packet successfully sent !!"); |
| 1294 | } else { |
| 1295 | future.awaitUninterruptibly(); |
| 1296 | } |
| 1297 | |
| 1298 | } |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | /** |
| 1303 | * Represents a Wait Timer task which waits the interface state to become WAITING. |
| 1304 | * It initiates DR election process. |
| 1305 | */ |
| 1306 | private class InternalWaitTimer implements Runnable { |
| 1307 | Channel ch; |
| 1308 | |
| 1309 | /** |
| 1310 | * Creates an instance of Wait Timer. |
| 1311 | */ |
| 1312 | InternalWaitTimer() { |
| 1313 | this.ch = channel; |
| 1314 | } |
| 1315 | |
| 1316 | @Override |
| 1317 | public void run() { |
| 1318 | log.debug("Wait timer expires..."); |
| 1319 | if (ch != null && ch.isConnected()) { |
| 1320 | try { |
| 1321 | waitTimer(ch); |
| 1322 | } catch (Exception e) { |
| 1323 | log.debug("Exception at wait timer ...!!!"); |
| 1324 | } |
| 1325 | |
| 1326 | } |
| 1327 | } |
| 1328 | } |
| 1329 | |
| 1330 | /** |
| 1331 | * Represents a task which sent a LS Acknowledge from the link state headers list. |
| 1332 | */ |
| 1333 | private class InternalDelayedAckTimer implements Runnable { |
| 1334 | Channel ch; |
| 1335 | |
| 1336 | /** |
| 1337 | * Creates an instance of Delayed acknowledge timer. |
| 1338 | */ |
| 1339 | InternalDelayedAckTimer() { |
| 1340 | this.ch = channel; |
| 1341 | } |
| 1342 | |
| 1343 | @Override |
| 1344 | public void run() { |
| 1345 | if (!((OspfInterfaceImpl) ospfInterface).linkStateHeaders().isEmpty()) { |
| 1346 | isDelayedAckTimerScheduled = true; |
| 1347 | if (ch != null && ch.isConnected()) { |
| 1348 | |
| 1349 | List<LsaHeader> listOfLsaHeadersAcknowledged = new ArrayList<>(); |
| 1350 | List<LsaHeader> listOfLsaHeaders = ((OspfInterfaceImpl) ospfInterface).linkStateHeaders(); |
| 1351 | log.debug("Delayed Ack, Number of Lsa's to Ack {}", listOfLsaHeaders.size()); |
| 1352 | Iterator itr = listOfLsaHeaders.iterator(); |
| 1353 | while (itr.hasNext()) { |
| 1354 | LsAcknowledge ackContent = new LsAcknowledge(); |
| 1355 | //Setting OSPF Header |
| 1356 | ackContent.setOspfVer(OspfUtil.OSPF_VERSION); |
| 1357 | ackContent.setOspftype(OspfPacketType.LSAACK.value()); |
| 1358 | ackContent.setRouterId(ospfArea.routerId()); |
| 1359 | ackContent.setAreaId(ospfArea.areaId()); |
| 1360 | ackContent.setAuthType(OspfUtil.NOT_ASSIGNED); |
| 1361 | ackContent.setAuthentication(OspfUtil.NOT_ASSIGNED); |
| 1362 | ackContent.setOspfPacLength(OspfUtil.NOT_ASSIGNED); |
| 1363 | ackContent.setChecksum(OspfUtil.NOT_ASSIGNED); |
| 1364 | //limit to mtu |
| 1365 | int currentLength = OspfUtil.OSPF_HEADER_LENGTH; |
| 1366 | int maxSize = ospfInterface.mtu() - |
| 1367 | OspfUtil.LSA_HEADER_LENGTH; // subtract a normal IP header. |
| 1368 | while (itr.hasNext()) { |
| 1369 | if ((currentLength + OspfUtil.LSA_HEADER_LENGTH) >= maxSize) { |
| 1370 | break; |
| 1371 | } |
| 1372 | LsaHeader lsaHeader = (LsaHeader) itr.next(); |
| 1373 | ackContent.addLinkStateHeader(lsaHeader); |
| 1374 | currentLength = currentLength + OspfUtil.LSA_HEADER_LENGTH; |
| 1375 | listOfLsaHeadersAcknowledged.add(lsaHeader); |
| 1376 | log.debug("Delayed Ack, Added Lsa's to Ack {}", lsaHeader); |
| 1377 | } |
| 1378 | |
| 1379 | log.debug("Delayed Ack, Number of Lsa's in LsAck packet {}", |
| 1380 | ackContent.getLinkStateHeaders().size()); |
| 1381 | |
| 1382 | //set the destination |
| 1383 | if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DR || |
| 1384 | ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.BDR |
| 1385 | || ((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.POINT2POINT) { |
| 1386 | ackContent.setDestinationIp(OspfUtil.ALL_SPF_ROUTERS); |
| 1387 | } else if (((OspfInterfaceImpl) ospfInterface).state() == OspfInterfaceState.DROTHER) { |
| 1388 | ackContent.setDestinationIp(OspfUtil.ALL_DROUTERS); |
| 1389 | } |
| 1390 | ch.write(ackContent); |
| 1391 | for (LsaHeader lsa : listOfLsaHeadersAcknowledged) { |
| 1392 | ((OspfInterfaceImpl) ospfInterface).linkStateHeaders().remove(lsa); |
| 1393 | ospfInterface.removeLsaFromNeighborMap(((OspfAreaImpl) ospfArea).getLsaKey(lsa)); |
| 1394 | } |
| 1395 | } |
| 1396 | } |
| 1397 | } |
| 1398 | } |
| 1399 | } |
| 1400 | } |