tom | 7ef8ff9 | 2014-09-17 13:08:06 -0700 | [diff] [blame] | 1 | //CHECKSTYLE:OFF |
tom | 9c94c5b | 2014-09-17 13:14:42 -0700 | [diff] [blame] | 2 | package org.onlab.onos.openflow.controller.impl; |
tom | 7ef8ff9 | 2014-09-17 13:08:06 -0700 | [diff] [blame] | 3 | |
| 4 | import java.io.IOException; |
| 5 | import java.nio.channels.ClosedChannelException; |
| 6 | import java.util.ArrayList; |
| 7 | import java.util.Collections; |
| 8 | import java.util.List; |
| 9 | import java.util.concurrent.CopyOnWriteArrayList; |
| 10 | import java.util.concurrent.RejectedExecutionException; |
| 11 | |
| 12 | import org.jboss.netty.channel.Channel; |
| 13 | import org.jboss.netty.channel.ChannelHandlerContext; |
| 14 | import org.jboss.netty.channel.ChannelStateEvent; |
| 15 | import org.jboss.netty.channel.ExceptionEvent; |
| 16 | import org.jboss.netty.channel.MessageEvent; |
| 17 | import org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler; |
| 18 | import org.jboss.netty.handler.timeout.IdleStateEvent; |
| 19 | import org.jboss.netty.handler.timeout.ReadTimeoutException; |
tom | 9c94c5b | 2014-09-17 13:14:42 -0700 | [diff] [blame] | 20 | import org.onlab.onos.openflow.controller.driver.OpenFlowSwitchDriver; |
| 21 | import org.onlab.onos.openflow.controller.driver.SwitchStateException; |
tom | 7ef8ff9 | 2014-09-17 13:08:06 -0700 | [diff] [blame] | 22 | import org.projectfloodlight.openflow.exceptions.OFParseError; |
| 23 | import org.projectfloodlight.openflow.protocol.OFAsyncGetReply; |
| 24 | import org.projectfloodlight.openflow.protocol.OFBadRequestCode; |
| 25 | import org.projectfloodlight.openflow.protocol.OFBarrierReply; |
| 26 | import org.projectfloodlight.openflow.protocol.OFBarrierRequest; |
| 27 | import org.projectfloodlight.openflow.protocol.OFDescStatsReply; |
| 28 | import org.projectfloodlight.openflow.protocol.OFDescStatsRequest; |
| 29 | import org.projectfloodlight.openflow.protocol.OFEchoReply; |
| 30 | import org.projectfloodlight.openflow.protocol.OFEchoRequest; |
| 31 | import org.projectfloodlight.openflow.protocol.OFErrorMsg; |
| 32 | import org.projectfloodlight.openflow.protocol.OFErrorType; |
| 33 | import org.projectfloodlight.openflow.protocol.OFExperimenter; |
| 34 | import org.projectfloodlight.openflow.protocol.OFFactory; |
| 35 | import org.projectfloodlight.openflow.protocol.OFFeaturesReply; |
| 36 | import org.projectfloodlight.openflow.protocol.OFFlowModFailedCode; |
| 37 | import org.projectfloodlight.openflow.protocol.OFFlowRemoved; |
| 38 | import org.projectfloodlight.openflow.protocol.OFGetConfigReply; |
| 39 | import org.projectfloodlight.openflow.protocol.OFGetConfigRequest; |
| 40 | import org.projectfloodlight.openflow.protocol.OFHello; |
| 41 | import org.projectfloodlight.openflow.protocol.OFHelloElem; |
| 42 | import org.projectfloodlight.openflow.protocol.OFMessage; |
| 43 | import org.projectfloodlight.openflow.protocol.OFPacketIn; |
| 44 | import org.projectfloodlight.openflow.protocol.OFPortDescStatsReply; |
| 45 | import org.projectfloodlight.openflow.protocol.OFPortDescStatsRequest; |
| 46 | import org.projectfloodlight.openflow.protocol.OFPortStatus; |
| 47 | import org.projectfloodlight.openflow.protocol.OFQueueGetConfigReply; |
| 48 | import org.projectfloodlight.openflow.protocol.OFRoleReply; |
| 49 | import org.projectfloodlight.openflow.protocol.OFSetConfig; |
| 50 | import org.projectfloodlight.openflow.protocol.OFStatsReply; |
| 51 | import org.projectfloodlight.openflow.protocol.OFStatsReplyFlags; |
| 52 | import org.projectfloodlight.openflow.protocol.OFStatsType; |
| 53 | import org.projectfloodlight.openflow.protocol.OFType; |
| 54 | import org.projectfloodlight.openflow.protocol.OFVersion; |
| 55 | import org.projectfloodlight.openflow.protocol.errormsg.OFBadRequestErrorMsg; |
| 56 | import org.projectfloodlight.openflow.protocol.errormsg.OFFlowModFailedErrorMsg; |
| 57 | import org.projectfloodlight.openflow.types.U32; |
| 58 | import org.slf4j.Logger; |
| 59 | import org.slf4j.LoggerFactory; |
| 60 | |
| 61 | /** |
| 62 | * Channel handler deals with the switch connection and dispatches |
| 63 | * switch messages to the appropriate locations. |
| 64 | */ |
| 65 | class OFChannelHandler extends IdleStateAwareChannelHandler { |
| 66 | private static final Logger log = LoggerFactory.getLogger(OFChannelHandler.class); |
| 67 | private final Controller controller; |
| 68 | private OpenFlowSwitchDriver sw; |
| 69 | private long thisdpid; // channelHandler cached value of connected switch id |
| 70 | private Channel channel; |
| 71 | // State needs to be volatile because the HandshakeTimeoutHandler |
| 72 | // needs to check if the handshake is complete |
| 73 | private volatile ChannelState state; |
| 74 | |
| 75 | // When a switch with a duplicate dpid is found (i.e we already have a |
| 76 | // connected switch with the same dpid), the new switch is immediately |
| 77 | // disconnected. At that point netty callsback channelDisconnected() which |
| 78 | // proceeds to cleaup switch state - we need to ensure that it does not cleanup |
| 79 | // switch state for the older (still connected) switch |
| 80 | private volatile Boolean duplicateDpidFound; |
| 81 | |
| 82 | // Temporary storage for switch-features and port-description |
| 83 | private OFFeaturesReply featuresReply; |
| 84 | private OFPortDescStatsReply portDescReply; |
| 85 | // a concurrent ArrayList to temporarily store port status messages |
| 86 | // before we are ready to deal with them |
| 87 | private final CopyOnWriteArrayList<OFPortStatus> pendingPortStatusMsg; |
| 88 | |
| 89 | //Indicates the openflow version used by this switch |
| 90 | protected OFVersion ofVersion; |
| 91 | protected OFFactory factory13; |
| 92 | protected OFFactory factory10; |
| 93 | |
| 94 | /** transaction Ids to use during handshake. Since only one thread |
| 95 | * calls into an OFChannelHandler instance, we don't need atomic. |
| 96 | * We will count down |
| 97 | */ |
| 98 | private int handshakeTransactionIds = -1; |
| 99 | |
| 100 | /** |
| 101 | * Create a new unconnected OFChannelHandler. |
| 102 | * @param controller |
| 103 | */ |
| 104 | OFChannelHandler(Controller controller) { |
| 105 | this.controller = controller; |
| 106 | this.state = ChannelState.INIT; |
| 107 | this.pendingPortStatusMsg = new CopyOnWriteArrayList<OFPortStatus>(); |
| 108 | factory13 = controller.getOFMessageFactory13(); |
| 109 | factory10 = controller.getOFMessageFactory10(); |
| 110 | duplicateDpidFound = Boolean.FALSE; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | |
| 115 | // XXX S consider if necessary |
| 116 | public void disconnectSwitch() { |
| 117 | sw.disconnectSwitch(); |
| 118 | } |
| 119 | |
| 120 | |
| 121 | |
| 122 | //************************* |
| 123 | // Channel State Machine |
| 124 | //************************* |
| 125 | |
| 126 | /** |
| 127 | * The state machine for handling the switch/channel state. All state |
| 128 | * transitions should happen from within the state machine (and not from other |
| 129 | * parts of the code) |
| 130 | */ |
| 131 | enum ChannelState { |
| 132 | /** |
| 133 | * Initial state before channel is connected. |
| 134 | */ |
| 135 | INIT(false) { |
| 136 | @Override |
| 137 | void processOFMessage(OFChannelHandler h, OFMessage m) |
| 138 | throws IOException, SwitchStateException { |
| 139 | illegalMessageReceived(h, m); |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | void processOFError(OFChannelHandler h, OFErrorMsg m) |
| 144 | throws IOException { |
| 145 | // need to implement since its abstract but it will never |
| 146 | // be called |
| 147 | } |
| 148 | |
| 149 | @Override |
| 150 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 151 | throws IOException { |
| 152 | unhandledMessageReceived(h, m); |
| 153 | } |
| 154 | }, |
| 155 | |
| 156 | /** |
| 157 | * We send a OF 1.3 HELLO to the switch and wait for a Hello from the switch. |
| 158 | * Once we receive the reply, we decide on OF 1.3 or 1.0 switch - no other |
| 159 | * protocol version is accepted. |
| 160 | * We send an OFFeaturesRequest depending on the protocol version selected |
| 161 | * Next state is WAIT_FEATURES_REPLY |
| 162 | */ |
| 163 | WAIT_HELLO(false) { |
| 164 | @Override |
| 165 | void processOFHello(OFChannelHandler h, OFHello m) |
| 166 | throws IOException { |
| 167 | // TODO We could check for the optional bitmap, but for now |
| 168 | // we are just checking the version number. |
| 169 | if (m.getVersion() == OFVersion.OF_13) { |
| 170 | log.info("Received {} Hello from {}", m.getVersion(), |
| 171 | h.channel.getRemoteAddress()); |
| 172 | h.ofVersion = OFVersion.OF_13; |
| 173 | } else if (m.getVersion() == OFVersion.OF_10) { |
| 174 | log.info("Received {} Hello from {} - switching to OF " |
| 175 | + "version 1.0", m.getVersion(), |
| 176 | h.channel.getRemoteAddress()); |
| 177 | h.ofVersion = OFVersion.OF_10; |
| 178 | } else { |
| 179 | log.error("Received Hello of version {} from switch at {}. " |
| 180 | + "This controller works with OF1.0 and OF1.3 " |
| 181 | + "switches. Disconnecting switch ...", |
| 182 | m.getVersion(), h.channel.getRemoteAddress()); |
| 183 | h.channel.disconnect(); |
| 184 | return; |
| 185 | } |
| 186 | h.sendHandshakeFeaturesRequestMessage(); |
| 187 | h.setState(WAIT_FEATURES_REPLY); |
| 188 | } |
| 189 | @Override |
| 190 | void processOFFeaturesReply(OFChannelHandler h, OFFeaturesReply m) |
| 191 | throws IOException, SwitchStateException { |
| 192 | illegalMessageReceived(h, m); |
| 193 | } |
| 194 | @Override |
| 195 | void processOFStatisticsReply(OFChannelHandler h, |
| 196 | OFStatsReply m) |
| 197 | throws IOException, SwitchStateException { |
| 198 | illegalMessageReceived(h, m); |
| 199 | } |
| 200 | @Override |
| 201 | void processOFError(OFChannelHandler h, OFErrorMsg m) { |
| 202 | logErrorDisconnect(h, m); |
| 203 | } |
| 204 | |
| 205 | @Override |
| 206 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 207 | throws IOException { |
| 208 | unhandledMessageReceived(h, m); |
| 209 | } |
| 210 | }, |
| 211 | |
| 212 | |
| 213 | /** |
| 214 | * We are waiting for a features reply message. Once we receive it, the |
| 215 | * behavior depends on whether this is a 1.0 or 1.3 switch. For 1.0, |
| 216 | * we send a SetConfig request, barrier, and GetConfig request and the |
| 217 | * next state is WAIT_CONFIG_REPLY. For 1.3, we send a Port description |
| 218 | * request and the next state is WAIT_PORT_DESC_REPLY. |
| 219 | */ |
| 220 | WAIT_FEATURES_REPLY(false) { |
| 221 | @Override |
| 222 | void processOFFeaturesReply(OFChannelHandler h, OFFeaturesReply m) |
| 223 | throws IOException { |
| 224 | h.thisdpid = m.getDatapathId().getLong(); |
| 225 | log.info("Received features reply for switch at {} with dpid {}", |
| 226 | h.getSwitchInfoString(), h.thisdpid); |
| 227 | |
| 228 | h.featuresReply = m; //temp store |
| 229 | if (h.ofVersion == OFVersion.OF_10) { |
| 230 | h.sendHandshakeSetConfig(); |
| 231 | h.setState(WAIT_CONFIG_REPLY); |
| 232 | } else { |
| 233 | //version is 1.3, must get switchport information |
| 234 | h.sendHandshakeOFPortDescRequest(); |
| 235 | h.setState(WAIT_PORT_DESC_REPLY); |
| 236 | } |
| 237 | } |
| 238 | @Override |
| 239 | void processOFStatisticsReply(OFChannelHandler h, |
| 240 | OFStatsReply m) |
| 241 | throws IOException, SwitchStateException { |
| 242 | illegalMessageReceived(h, m); |
| 243 | } |
| 244 | @Override |
| 245 | void processOFError(OFChannelHandler h, OFErrorMsg m) { |
| 246 | logErrorDisconnect(h, m); |
| 247 | } |
| 248 | |
| 249 | @Override |
| 250 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 251 | throws IOException { |
| 252 | unhandledMessageReceived(h, m); |
| 253 | } |
| 254 | }, |
| 255 | |
| 256 | /** |
| 257 | * We are waiting for a description of the 1.3 switch ports. |
| 258 | * Once received, we send a SetConfig request |
| 259 | * Next State is WAIT_CONFIG_REPLY |
| 260 | */ |
| 261 | WAIT_PORT_DESC_REPLY(false) { |
| 262 | |
| 263 | @Override |
| 264 | void processOFStatisticsReply(OFChannelHandler h, OFStatsReply m) |
| 265 | throws SwitchStateException { |
| 266 | // Read port description |
| 267 | if (m.getStatsType() != OFStatsType.PORT_DESC) { |
| 268 | log.warn("Expecting port description stats but received stats " |
| 269 | + "type {} from {}. Ignoring ...", m.getStatsType(), |
| 270 | h.channel.getRemoteAddress()); |
| 271 | return; |
| 272 | } |
| 273 | if (m.getFlags().contains(OFStatsReplyFlags.REPLY_MORE)) { |
| 274 | log.warn("Stats reply indicates more stats from sw {} for " |
| 275 | + "port description - not currently handled", |
| 276 | h.getSwitchInfoString()); |
| 277 | } |
| 278 | h.portDescReply = (OFPortDescStatsReply) m; // temp store |
| 279 | log.info("Received port desc reply for switch at {}", |
| 280 | h.getSwitchInfoString()); |
| 281 | try { |
| 282 | h.sendHandshakeSetConfig(); |
| 283 | } catch (IOException e) { |
| 284 | log.error("Unable to send setConfig after PortDescReply. " |
| 285 | + "Error: {}", e.getMessage()); |
| 286 | } |
| 287 | h.setState(WAIT_CONFIG_REPLY); |
| 288 | } |
| 289 | |
| 290 | @Override |
| 291 | void processOFError(OFChannelHandler h, OFErrorMsg m) |
| 292 | throws IOException, SwitchStateException { |
| 293 | logErrorDisconnect(h, m); |
| 294 | |
| 295 | } |
| 296 | |
| 297 | @Override |
| 298 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 299 | throws IOException, SwitchStateException { |
| 300 | unhandledMessageReceived(h, m); |
| 301 | |
| 302 | } |
| 303 | }, |
| 304 | |
| 305 | /** |
| 306 | * We are waiting for a config reply message. Once we receive it |
| 307 | * we send a DescriptionStatsRequest to the switch. |
| 308 | * Next state: WAIT_DESCRIPTION_STAT_REPLY |
| 309 | */ |
| 310 | WAIT_CONFIG_REPLY(false) { |
| 311 | @Override |
| 312 | void processOFGetConfigReply(OFChannelHandler h, OFGetConfigReply m) |
| 313 | throws IOException { |
| 314 | if (m.getMissSendLen() == 0xffff) { |
| 315 | log.trace("Config Reply from switch {} confirms " |
| 316 | + "miss length set to 0xffff", |
| 317 | h.getSwitchInfoString()); |
| 318 | } else { |
| 319 | // FIXME: we can't really deal with switches that don't send |
| 320 | // full packets. Shouldn't we drop the connection here? |
| 321 | log.warn("Config Reply from switch {} has" |
| 322 | + "miss length set to {}", |
| 323 | h.getSwitchInfoString(), |
| 324 | m.getMissSendLen()); |
| 325 | } |
| 326 | h.sendHandshakeDescriptionStatsRequest(); |
| 327 | h.setState(WAIT_DESCRIPTION_STAT_REPLY); |
| 328 | } |
| 329 | |
| 330 | @Override |
| 331 | void processOFBarrierReply(OFChannelHandler h, OFBarrierReply m) { |
| 332 | // do nothing; |
| 333 | } |
| 334 | |
| 335 | @Override |
| 336 | void processOFFeaturesReply(OFChannelHandler h, OFFeaturesReply m) |
| 337 | throws IOException, SwitchStateException { |
| 338 | illegalMessageReceived(h, m); |
| 339 | } |
| 340 | @Override |
| 341 | void processOFStatisticsReply(OFChannelHandler h, |
| 342 | OFStatsReply m) |
| 343 | throws IOException, SwitchStateException { |
| 344 | log.error("Received multipart(stats) message sub-type {}", |
| 345 | m.getStatsType()); |
| 346 | illegalMessageReceived(h, m); |
| 347 | } |
| 348 | |
| 349 | @Override |
| 350 | void processOFError(OFChannelHandler h, OFErrorMsg m) { |
| 351 | logErrorDisconnect(h, m); |
| 352 | } |
| 353 | |
| 354 | @Override |
| 355 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 356 | throws IOException { |
| 357 | h.pendingPortStatusMsg.add(m); |
| 358 | } |
| 359 | }, |
| 360 | |
| 361 | |
| 362 | /** |
| 363 | * We are waiting for a OFDescriptionStat message from the switch. |
| 364 | * Once we receive any stat message we try to parse it. If it's not |
| 365 | * a description stats message we disconnect. If its the expected |
| 366 | * description stats message, we: |
| 367 | * - use the switch driver to bind the switch and get an IOFSwitch instance |
| 368 | * - setup the IOFSwitch instance |
| 369 | * - add switch controller and send the initial role |
| 370 | * request to the switch. |
| 371 | * Next state: WAIT_INITIAL_ROLE |
| 372 | * In the typical case, where switches support role request messages |
| 373 | * the next state is where we expect the role reply message. |
| 374 | * In the special case that where the switch does not support any kind |
| 375 | * of role request messages, we don't send a role message, but we do |
| 376 | * request mastership from the registry service. This controller |
| 377 | * should become master once we hear back from the registry service. |
| 378 | * All following states will have a h.sw instance! |
| 379 | */ |
| 380 | WAIT_DESCRIPTION_STAT_REPLY(false) { |
| 381 | @Override |
| 382 | void processOFStatisticsReply(OFChannelHandler h, OFStatsReply m) |
| 383 | throws SwitchStateException { |
| 384 | // Read description, if it has been updated |
| 385 | if (m.getStatsType() != OFStatsType.DESC) { |
| 386 | log.warn("Expecting Description stats but received stats " |
| 387 | + "type {} from {}. Ignoring ...", m.getStatsType(), |
| 388 | h.channel.getRemoteAddress()); |
| 389 | return; |
| 390 | } |
| 391 | log.info("Received switch description reply from switch at {}", |
| 392 | h.channel.getRemoteAddress()); |
| 393 | OFDescStatsReply drep = (OFDescStatsReply) m; |
| 394 | // Here is where we differentiate between different kinds of switches |
| 395 | h.sw = h.controller.getOFSwitchInstance(h.thisdpid, drep, h.ofVersion); |
| 396 | |
| 397 | h.sw.setOFVersion(h.ofVersion); |
| 398 | h.sw.setFeaturesReply(h.featuresReply); |
| 399 | h.sw.setPortDescReply(h.portDescReply); |
| 400 | h.sw.setConnected(true); |
| 401 | h.sw.setChannel(h.channel); |
| 402 | boolean success = h.sw.connectSwitch(); |
| 403 | |
| 404 | if (!success) { |
| 405 | disconnectDuplicate(h); |
| 406 | return; |
| 407 | } |
| 408 | // set switch information |
| 409 | |
| 410 | |
| 411 | |
| 412 | log.info("Switch {} bound to class {}, description {}", |
| 413 | new Object[] {h.sw, h.sw.getClass(), drep }); |
| 414 | //Put switch in EQUAL mode until we hear back from the global registry |
| 415 | //log.debug("Setting new switch {} to EQUAL and sending Role request", |
| 416 | // h.sw.getStringId()); |
| 417 | //h.sw.activateEqualSwitch(); |
| 418 | //h.setSwitchRole(RoleState.EQUAL); |
| 419 | |
| 420 | h.sw.startDriverHandshake(); |
| 421 | h.setState(WAIT_SWITCH_DRIVER_SUB_HANDSHAKE); |
| 422 | |
| 423 | } |
| 424 | |
| 425 | @Override |
| 426 | void processOFError(OFChannelHandler h, OFErrorMsg m) { |
| 427 | logErrorDisconnect(h, m); |
| 428 | } |
| 429 | |
| 430 | @Override |
| 431 | void processOFFeaturesReply(OFChannelHandler h, OFFeaturesReply m) |
| 432 | throws IOException, SwitchStateException { |
| 433 | illegalMessageReceived(h, m); |
| 434 | } |
| 435 | |
| 436 | @Override |
| 437 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 438 | throws IOException { |
| 439 | h.pendingPortStatusMsg.add(m); |
| 440 | } |
| 441 | }, |
| 442 | |
| 443 | |
| 444 | /** |
| 445 | * We are waiting for the respective switch driver to complete its |
| 446 | * configuration. Notice that we do not consider this to be part of the main |
| 447 | * switch-controller handshake. But we do consider it as a step that comes |
| 448 | * before we declare the switch as available to the controller. |
| 449 | * Next State: depends on the role of this controller for this switch - either |
| 450 | * MASTER or EQUAL. |
| 451 | */ |
| 452 | WAIT_SWITCH_DRIVER_SUB_HANDSHAKE(true) { |
| 453 | |
| 454 | @Override |
| 455 | void processOFError(OFChannelHandler h, OFErrorMsg m) |
| 456 | throws IOException { |
| 457 | // will never be called. We override processOFMessage |
| 458 | } |
| 459 | |
| 460 | @Override |
| 461 | void processOFMessage(OFChannelHandler h, OFMessage m) |
| 462 | throws IOException, SwitchStateException { |
| 463 | if (m.getType() == OFType.ECHO_REQUEST) { |
| 464 | processOFEchoRequest(h, (OFEchoRequest) m); |
| 465 | } else if (m.getType() == OFType.ROLE_REPLY) { |
| 466 | h.sw.handleRole(m); |
| 467 | } else if (m.getType() == OFType.ERROR) { |
| 468 | if (!h.sw.handleRoleError((OFErrorMsg)m)) { |
| 469 | h.sw.processDriverHandshakeMessage(m); |
| 470 | if (h.sw.isDriverHandshakeComplete()) { |
| 471 | h.setState(ACTIVE); |
| 472 | } |
| 473 | } |
| 474 | } else { |
| 475 | if (m.getType() == OFType.EXPERIMENTER && |
| 476 | ((OFExperimenter) m).getExperimenter() == |
| 477 | RoleManager.NICIRA_EXPERIMENTER) { |
| 478 | h.sw.handleNiciraRole(m); |
| 479 | } else { |
| 480 | h.sw.processDriverHandshakeMessage(m); |
| 481 | if (h.sw.isDriverHandshakeComplete()) { |
| 482 | h.setState(ACTIVE); |
| 483 | } |
| 484 | } |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | @Override |
| 489 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 490 | throws IOException, SwitchStateException { |
| 491 | h.pendingPortStatusMsg.add(m); |
| 492 | } |
| 493 | }, |
| 494 | |
| 495 | |
| 496 | /** |
| 497 | * This controller is in MASTER role for this switch. We enter this state |
| 498 | * after requesting and winning control from the global registry. |
| 499 | * The main handshake as well as the switch-driver sub-handshake |
| 500 | * is complete at this point. |
| 501 | * // XXX S reconsider below |
| 502 | * In the (near) future we may deterministically assign controllers to |
| 503 | * switches at startup. |
| 504 | * We only leave this state if the switch disconnects or |
| 505 | * if we send a role request for SLAVE /and/ receive the role reply for |
| 506 | * SLAVE. |
| 507 | */ |
| 508 | ACTIVE(true) { |
| 509 | @Override |
| 510 | void processOFError(OFChannelHandler h, OFErrorMsg m) |
| 511 | throws IOException, SwitchStateException { |
| 512 | // if we get here, then the error message is for something else |
| 513 | if (m.getErrType() == OFErrorType.BAD_REQUEST && |
| 514 | ((OFBadRequestErrorMsg) m).getCode() == |
| 515 | OFBadRequestCode.EPERM) { |
| 516 | // We are the master controller and the switch returned |
| 517 | // a permission error. This is a likely indicator that |
| 518 | // the switch thinks we are slave. Reassert our |
| 519 | // role |
| 520 | // FIXME: this could be really bad during role transitions |
| 521 | // if two controllers are master (even if its only for |
| 522 | // a brief period). We might need to see if these errors |
| 523 | // persist before we reassert |
| 524 | log.warn("Received permission error from switch {} while" + |
| 525 | "being master. Reasserting master role.", |
| 526 | h.getSwitchInfoString()); |
| 527 | h.sw.reassertRole(); |
| 528 | } else if (m.getErrType() == OFErrorType.FLOW_MOD_FAILED && |
| 529 | ((OFFlowModFailedErrorMsg) m).getCode() == |
| 530 | OFFlowModFailedCode.ALL_TABLES_FULL) { |
| 531 | h.sw.setTableFull(true); |
| 532 | } else { |
| 533 | logError(h, m); |
| 534 | } |
| 535 | h.dispatchMessage(m); |
| 536 | } |
| 537 | |
| 538 | @Override |
| 539 | void processOFStatisticsReply(OFChannelHandler h, |
| 540 | OFStatsReply m) { |
| 541 | h.dispatchMessage(m); |
| 542 | } |
| 543 | |
| 544 | @Override |
| 545 | void processOFExperimenter(OFChannelHandler h, OFExperimenter m) |
| 546 | throws SwitchStateException { |
| 547 | h.sw.handleNiciraRole(m); |
| 548 | } |
| 549 | |
| 550 | @Override |
| 551 | void processOFRoleReply(OFChannelHandler h, OFRoleReply m) |
| 552 | throws SwitchStateException { |
| 553 | h.sw.handleRole(m); |
| 554 | } |
| 555 | |
| 556 | @Override |
| 557 | void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 558 | throws SwitchStateException { |
| 559 | handlePortStatusMessage(h, m, true); |
| 560 | h.dispatchMessage(m); |
| 561 | } |
| 562 | |
| 563 | @Override |
| 564 | void processOFPacketIn(OFChannelHandler h, OFPacketIn m) { |
| 565 | h.dispatchMessage(m); |
| 566 | } |
| 567 | |
| 568 | @Override |
| 569 | void processOFFlowRemoved(OFChannelHandler h, |
| 570 | OFFlowRemoved m) { |
| 571 | h.dispatchMessage(m); |
| 572 | } |
| 573 | |
| 574 | @Override |
| 575 | void processOFBarrierReply(OFChannelHandler h, OFBarrierReply m) { |
| 576 | h.dispatchMessage(m); |
| 577 | } |
| 578 | |
| 579 | }; |
| 580 | |
| 581 | private final boolean handshakeComplete; |
| 582 | ChannelState(boolean handshakeComplete) { |
| 583 | this.handshakeComplete = handshakeComplete; |
| 584 | } |
| 585 | |
| 586 | /** |
| 587 | * Is this a state in which the handshake has completed? |
| 588 | * @return true if the handshake is complete |
| 589 | */ |
| 590 | public boolean isHandshakeComplete() { |
| 591 | return handshakeComplete; |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Get a string specifying the switch connection, state, and |
| 596 | * message received. To be used as message for SwitchStateException |
| 597 | * or log messages |
| 598 | * @param h The channel handler (to get switch information_ |
| 599 | * @param m The OFMessage that has just been received |
| 600 | * @param details A string giving more details about the exact nature |
| 601 | * of the problem. |
| 602 | * @return display string |
| 603 | */ |
| 604 | // needs to be protected because enum members are actually subclasses |
| 605 | protected String getSwitchStateMessage(OFChannelHandler h, |
| 606 | OFMessage m, |
| 607 | String details) { |
| 608 | return String.format("Switch: [%s], State: [%s], received: [%s]" |
| 609 | + ", details: %s", |
| 610 | h.getSwitchInfoString(), |
| 611 | this.toString(), |
| 612 | m.getType().toString(), |
| 613 | details); |
| 614 | } |
| 615 | |
| 616 | /** |
| 617 | * We have an OFMessage we didn't expect given the current state and |
| 618 | * we want to treat this as an error. |
| 619 | * We currently throw an exception that will terminate the connection |
| 620 | * However, we could be more forgiving |
| 621 | * @param h the channel handler that received the message |
| 622 | * @param m the message |
| 623 | * @throws SwitchStateException |
| 624 | * @throws SwitchStateExeption we always through the execption |
| 625 | */ |
| 626 | // needs to be protected because enum members are acutally subclasses |
| 627 | protected void illegalMessageReceived(OFChannelHandler h, OFMessage m) |
| 628 | throws SwitchStateException { |
| 629 | String msg = getSwitchStateMessage(h, m, |
| 630 | "Switch should never send this message in the current state"); |
| 631 | throw new SwitchStateException(msg); |
| 632 | |
| 633 | } |
| 634 | |
| 635 | /** |
| 636 | * We have an OFMessage we didn't expect given the current state and |
| 637 | * we want to ignore the message. |
| 638 | * @param h the channel handler the received the message |
| 639 | * @param m the message |
| 640 | */ |
| 641 | protected void unhandledMessageReceived(OFChannelHandler h, |
| 642 | OFMessage m) { |
| 643 | if (log.isDebugEnabled()) { |
| 644 | String msg = getSwitchStateMessage(h, m, |
| 645 | "Ignoring unexpected message"); |
| 646 | log.debug(msg); |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | /** |
| 651 | * Log an OpenFlow error message from a switch. |
| 652 | * @param h The switch that sent the error |
| 653 | * @param error The error message |
| 654 | */ |
| 655 | protected void logError(OFChannelHandler h, OFErrorMsg error) { |
| 656 | log.error("{} from switch {} in state {}", |
| 657 | new Object[] { |
| 658 | error, |
| 659 | h.getSwitchInfoString(), |
| 660 | this.toString()}); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * Log an OpenFlow error message from a switch and disconnect the |
| 665 | * channel. |
| 666 | * |
| 667 | * @param h the IO channel for this switch. |
| 668 | * @param error The error message |
| 669 | */ |
| 670 | protected void logErrorDisconnect(OFChannelHandler h, OFErrorMsg error) { |
| 671 | logError(h, error); |
| 672 | h.channel.disconnect(); |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * log an error message for a duplicate dpid and disconnect this channel. |
| 677 | * @param h the IO channel for this switch. |
| 678 | */ |
| 679 | protected void disconnectDuplicate(OFChannelHandler h) { |
| 680 | log.error("Duplicated dpid or incompleted cleanup - " |
| 681 | + "disconnecting channel {}", h.getSwitchInfoString()); |
| 682 | h.duplicateDpidFound = Boolean.TRUE; |
| 683 | h.channel.disconnect(); |
| 684 | } |
| 685 | |
| 686 | |
| 687 | |
| 688 | /** |
| 689 | * Handles all pending port status messages before a switch is declared |
| 690 | * activated in MASTER or EQUAL role. Note that since this handling |
| 691 | * precedes the activation (and therefore notification to IOFSwitchListerners) |
| 692 | * the changes to ports will already be visible once the switch is |
| 693 | * activated. As a result, no notifications are sent out for these |
| 694 | * pending portStatus messages. |
| 695 | * @param h |
| 696 | * @throws SwitchStateException |
| 697 | */ |
| 698 | protected void handlePendingPortStatusMessages(OFChannelHandler h) { |
| 699 | try { |
| 700 | handlePendingPortStatusMessages(h, 0); |
| 701 | } catch (SwitchStateException e) { |
| 702 | log.error(e.getMessage()); |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | private void handlePendingPortStatusMessages(OFChannelHandler h, int index) |
| 707 | throws SwitchStateException { |
| 708 | if (h.sw == null) { |
| 709 | String msg = "State machine error: switch is null. Should never " + |
| 710 | "happen"; |
| 711 | throw new SwitchStateException(msg); |
| 712 | } |
| 713 | ArrayList<OFPortStatus> temp = new ArrayList<OFPortStatus>(); |
| 714 | for (OFPortStatus ps: h.pendingPortStatusMsg) { |
| 715 | temp.add(ps); |
| 716 | handlePortStatusMessage(h, ps, false); |
| 717 | } |
| 718 | temp.clear(); |
| 719 | // expensive but ok - we don't expect too many port-status messages |
| 720 | // note that we cannot use clear(), because of the reasons below |
| 721 | h.pendingPortStatusMsg.removeAll(temp); |
| 722 | // the iterator above takes a snapshot of the list - so while we were |
| 723 | // dealing with the pending port-status messages, we could have received |
| 724 | // newer ones. Handle them recursively, but break the recursion after |
| 725 | // five steps to avoid an attack. |
| 726 | if (!h.pendingPortStatusMsg.isEmpty() && ++index < 5) { |
| 727 | handlePendingPortStatusMessages(h, index); |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | /** |
| 732 | * Handle a port status message. |
| 733 | * |
| 734 | * Handle a port status message by updating the port maps in the |
| 735 | * IOFSwitch instance and notifying Controller about the change so |
| 736 | * it can dispatch a switch update. |
| 737 | * |
| 738 | * @param h The OFChannelHhandler that received the message |
| 739 | * @param m The PortStatus message we received |
| 740 | * @param doNotify if true switch port changed events will be |
| 741 | * dispatched |
| 742 | * @throws SwitchStateException |
| 743 | * |
| 744 | */ |
| 745 | protected void handlePortStatusMessage(OFChannelHandler h, OFPortStatus m, |
| 746 | boolean doNotify) throws SwitchStateException { |
| 747 | if (h.sw == null) { |
| 748 | String msg = getSwitchStateMessage(h, m, |
| 749 | "State machine error: switch is null. Should never " + |
| 750 | "happen"); |
| 751 | throw new SwitchStateException(msg); |
| 752 | } |
| 753 | |
| 754 | h.sw.handleMessage(m); |
| 755 | } |
| 756 | |
| 757 | |
| 758 | /** |
| 759 | * Process an OF message received on the channel and |
| 760 | * update state accordingly. |
| 761 | * |
| 762 | * The main "event" of the state machine. Process the received message, |
| 763 | * send follow up message if required and update state if required. |
| 764 | * |
| 765 | * Switches on the message type and calls more specific event handlers |
| 766 | * for each individual OF message type. If we receive a message that |
| 767 | * is supposed to be sent from a controller to a switch we throw |
| 768 | * a SwitchStateExeption. |
| 769 | * |
| 770 | * The more specific handlers can also throw SwitchStateExceptions |
| 771 | * |
| 772 | * @param h The OFChannelHandler that received the message |
| 773 | * @param m The message we received. |
| 774 | * @throws SwitchStateException |
| 775 | * @throws IOException |
| 776 | */ |
| 777 | void processOFMessage(OFChannelHandler h, OFMessage m) |
| 778 | throws IOException, SwitchStateException { |
| 779 | switch(m.getType()) { |
| 780 | case HELLO: |
| 781 | processOFHello(h, (OFHello) m); |
| 782 | break; |
| 783 | case BARRIER_REPLY: |
| 784 | processOFBarrierReply(h, (OFBarrierReply) m); |
| 785 | break; |
| 786 | case ECHO_REPLY: |
| 787 | processOFEchoReply(h, (OFEchoReply) m); |
| 788 | break; |
| 789 | case ECHO_REQUEST: |
| 790 | processOFEchoRequest(h, (OFEchoRequest) m); |
| 791 | break; |
| 792 | case ERROR: |
| 793 | processOFError(h, (OFErrorMsg) m); |
| 794 | break; |
| 795 | case FEATURES_REPLY: |
| 796 | processOFFeaturesReply(h, (OFFeaturesReply) m); |
| 797 | break; |
| 798 | case FLOW_REMOVED: |
| 799 | processOFFlowRemoved(h, (OFFlowRemoved) m); |
| 800 | break; |
| 801 | case GET_CONFIG_REPLY: |
| 802 | processOFGetConfigReply(h, (OFGetConfigReply) m); |
| 803 | break; |
| 804 | case PACKET_IN: |
| 805 | processOFPacketIn(h, (OFPacketIn) m); |
| 806 | break; |
| 807 | case PORT_STATUS: |
| 808 | processOFPortStatus(h, (OFPortStatus) m); |
| 809 | break; |
| 810 | case QUEUE_GET_CONFIG_REPLY: |
| 811 | processOFQueueGetConfigReply(h, (OFQueueGetConfigReply) m); |
| 812 | break; |
| 813 | case STATS_REPLY: // multipart_reply in 1.3 |
| 814 | processOFStatisticsReply(h, (OFStatsReply) m); |
| 815 | break; |
| 816 | case EXPERIMENTER: |
| 817 | processOFExperimenter(h, (OFExperimenter) m); |
| 818 | break; |
| 819 | case ROLE_REPLY: |
| 820 | processOFRoleReply(h, (OFRoleReply) m); |
| 821 | break; |
| 822 | case GET_ASYNC_REPLY: |
| 823 | processOFGetAsyncReply(h, (OFAsyncGetReply) m); |
| 824 | break; |
| 825 | |
| 826 | // The following messages are sent to switches. The controller |
| 827 | // should never receive them |
| 828 | case SET_CONFIG: |
| 829 | case GET_CONFIG_REQUEST: |
| 830 | case PACKET_OUT: |
| 831 | case PORT_MOD: |
| 832 | case QUEUE_GET_CONFIG_REQUEST: |
| 833 | case BARRIER_REQUEST: |
| 834 | case STATS_REQUEST: // multipart request in 1.3 |
| 835 | case FEATURES_REQUEST: |
| 836 | case FLOW_MOD: |
| 837 | case GROUP_MOD: |
| 838 | case TABLE_MOD: |
| 839 | case GET_ASYNC_REQUEST: |
| 840 | case SET_ASYNC: |
| 841 | case METER_MOD: |
| 842 | default: |
| 843 | illegalMessageReceived(h, m); |
| 844 | break; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | /*----------------------------------------------------------------- |
| 849 | * Default implementation for message handlers in any state. |
| 850 | * |
| 851 | * Individual states must override these if they want a behavior |
| 852 | * that differs from the default. |
| 853 | * |
| 854 | * In general, these handlers simply ignore the message and do |
| 855 | * nothing. |
| 856 | * |
| 857 | * There are some exceptions though, since some messages really |
| 858 | * are handled the same way in every state (e.g., ECHO_REQUST) or |
| 859 | * that are only valid in a single state (e.g., HELLO, GET_CONFIG_REPLY |
| 860 | -----------------------------------------------------------------*/ |
| 861 | |
| 862 | void processOFHello(OFChannelHandler h, OFHello m) |
| 863 | throws IOException, SwitchStateException { |
| 864 | // we only expect hello in the WAIT_HELLO state |
| 865 | illegalMessageReceived(h, m); |
| 866 | } |
| 867 | |
| 868 | void processOFBarrierReply(OFChannelHandler h, OFBarrierReply m) |
| 869 | throws IOException { |
| 870 | // Silently ignore. |
| 871 | } |
| 872 | |
| 873 | void processOFEchoRequest(OFChannelHandler h, OFEchoRequest m) |
| 874 | throws IOException { |
| 875 | if (h.ofVersion == null) { |
| 876 | log.error("No OF version set for {}. Not sending Echo REPLY", |
| 877 | h.channel.getRemoteAddress()); |
| 878 | return; |
| 879 | } |
| 880 | OFFactory factory = (h.ofVersion == OFVersion.OF_13) ? |
| 881 | h.controller.getOFMessageFactory13() : h.controller.getOFMessageFactory10(); |
| 882 | OFEchoReply reply = factory |
| 883 | .buildEchoReply() |
| 884 | .setXid(m.getXid()) |
| 885 | .setData(m.getData()) |
| 886 | .build(); |
| 887 | h.channel.write(Collections.singletonList(reply)); |
| 888 | } |
| 889 | |
| 890 | void processOFEchoReply(OFChannelHandler h, OFEchoReply m) |
| 891 | throws IOException { |
| 892 | // Do nothing with EchoReplies !! |
| 893 | } |
| 894 | |
| 895 | // no default implementation for OFError |
| 896 | // every state must override it |
| 897 | abstract void processOFError(OFChannelHandler h, OFErrorMsg m) |
| 898 | throws IOException, SwitchStateException; |
| 899 | |
| 900 | |
| 901 | void processOFFeaturesReply(OFChannelHandler h, OFFeaturesReply m) |
| 902 | throws IOException, SwitchStateException { |
| 903 | unhandledMessageReceived(h, m); |
| 904 | } |
| 905 | |
| 906 | void processOFFlowRemoved(OFChannelHandler h, OFFlowRemoved m) |
| 907 | throws IOException { |
| 908 | unhandledMessageReceived(h, m); |
| 909 | } |
| 910 | |
| 911 | void processOFGetConfigReply(OFChannelHandler h, OFGetConfigReply m) |
| 912 | throws IOException, SwitchStateException { |
| 913 | // we only expect config replies in the WAIT_CONFIG_REPLY state |
| 914 | illegalMessageReceived(h, m); |
| 915 | } |
| 916 | |
| 917 | void processOFPacketIn(OFChannelHandler h, OFPacketIn m) |
| 918 | throws IOException { |
| 919 | unhandledMessageReceived(h, m); |
| 920 | } |
| 921 | |
| 922 | // no default implementation. Every state needs to handle it. |
| 923 | abstract void processOFPortStatus(OFChannelHandler h, OFPortStatus m) |
| 924 | throws IOException, SwitchStateException; |
| 925 | |
| 926 | void processOFQueueGetConfigReply(OFChannelHandler h, |
| 927 | OFQueueGetConfigReply m) |
| 928 | throws IOException { |
| 929 | unhandledMessageReceived(h, m); |
| 930 | } |
| 931 | |
| 932 | void processOFStatisticsReply(OFChannelHandler h, OFStatsReply m) |
| 933 | throws IOException, SwitchStateException { |
| 934 | unhandledMessageReceived(h, m); |
| 935 | } |
| 936 | |
| 937 | void processOFExperimenter(OFChannelHandler h, OFExperimenter m) |
| 938 | throws IOException, SwitchStateException { |
| 939 | // TODO: it might make sense to parse the vendor message here |
| 940 | // into the known vendor messages we support and then call more |
| 941 | // specific event handlers |
| 942 | unhandledMessageReceived(h, m); |
| 943 | } |
| 944 | |
| 945 | void processOFRoleReply(OFChannelHandler h, OFRoleReply m) |
| 946 | throws SwitchStateException, IOException { |
| 947 | unhandledMessageReceived(h, m); |
| 948 | } |
| 949 | |
| 950 | void processOFGetAsyncReply(OFChannelHandler h, |
| 951 | OFAsyncGetReply m) { |
| 952 | unhandledMessageReceived(h, m); |
| 953 | } |
| 954 | |
| 955 | } |
| 956 | |
| 957 | |
| 958 | |
| 959 | //************************* |
| 960 | // Channel handler methods |
| 961 | //************************* |
| 962 | |
| 963 | @Override |
| 964 | public void channelConnected(ChannelHandlerContext ctx, |
| 965 | ChannelStateEvent e) throws Exception { |
| 966 | channel = e.getChannel(); |
| 967 | log.info("New switch connection from {}", |
| 968 | channel.getRemoteAddress()); |
| 969 | sendHandshakeHelloMessage(); |
| 970 | setState(ChannelState.WAIT_HELLO); |
| 971 | } |
| 972 | |
| 973 | @Override |
| 974 | public void channelDisconnected(ChannelHandlerContext ctx, |
| 975 | ChannelStateEvent e) throws Exception { |
| 976 | log.info("Switch disconnected callback for sw:{}. Cleaning up ...", |
| 977 | getSwitchInfoString()); |
| 978 | if (thisdpid != 0) { |
| 979 | if (!duplicateDpidFound) { |
| 980 | // if the disconnected switch (on this ChannelHandler) |
| 981 | // was not one with a duplicate-dpid, it is safe to remove all |
| 982 | // state for it at the controller. Notice that if the disconnected |
| 983 | // switch was a duplicate-dpid, calling the method below would clear |
| 984 | // all state for the original switch (with the same dpid), |
| 985 | // which we obviously don't want. |
| 986 | sw.removeConnectedSwitch(); |
| 987 | } else { |
| 988 | // A duplicate was disconnected on this ChannelHandler, |
| 989 | // this is the same switch reconnecting, but the original state was |
| 990 | // not cleaned up - XXX check liveness of original ChannelHandler |
| 991 | duplicateDpidFound = Boolean.FALSE; |
| 992 | } |
| 993 | } else { |
| 994 | log.warn("no dpid in channelHandler registered for " |
| 995 | + "disconnected switch {}", getSwitchInfoString()); |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | @Override |
| 1000 | public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) |
| 1001 | throws Exception { |
| 1002 | if (e.getCause() instanceof ReadTimeoutException) { |
| 1003 | // switch timeout |
| 1004 | log.error("Disconnecting switch {} due to read timeout", |
| 1005 | getSwitchInfoString()); |
| 1006 | ctx.getChannel().close(); |
| 1007 | } else if (e.getCause() instanceof HandshakeTimeoutException) { |
| 1008 | log.error("Disconnecting switch {}: failed to complete handshake", |
| 1009 | getSwitchInfoString()); |
| 1010 | ctx.getChannel().close(); |
| 1011 | } else if (e.getCause() instanceof ClosedChannelException) { |
| 1012 | log.debug("Channel for sw {} already closed", getSwitchInfoString()); |
| 1013 | } else if (e.getCause() instanceof IOException) { |
| 1014 | log.error("Disconnecting switch {} due to IO Error: {}", |
| 1015 | getSwitchInfoString(), e.getCause().getMessage()); |
| 1016 | if (log.isDebugEnabled()) { |
| 1017 | // still print stack trace if debug is enabled |
| 1018 | log.debug("StackTrace for previous Exception: ", e.getCause()); |
| 1019 | } |
| 1020 | ctx.getChannel().close(); |
| 1021 | } else if (e.getCause() instanceof SwitchStateException) { |
| 1022 | log.error("Disconnecting switch {} due to switch state error: {}", |
| 1023 | getSwitchInfoString(), e.getCause().getMessage()); |
| 1024 | if (log.isDebugEnabled()) { |
| 1025 | // still print stack trace if debug is enabled |
| 1026 | log.debug("StackTrace for previous Exception: ", e.getCause()); |
| 1027 | } |
| 1028 | ctx.getChannel().close(); |
| 1029 | } else if (e.getCause() instanceof OFParseError) { |
| 1030 | log.error("Disconnecting switch " |
| 1031 | + getSwitchInfoString() + |
| 1032 | " due to message parse failure", |
| 1033 | e.getCause()); |
| 1034 | ctx.getChannel().close(); |
| 1035 | } else if (e.getCause() instanceof RejectedExecutionException) { |
| 1036 | log.warn("Could not process message: queue full"); |
| 1037 | } else { |
| 1038 | log.error("Error while processing message from switch " |
| 1039 | + getSwitchInfoString() |
| 1040 | + "state " + this.state, e.getCause()); |
| 1041 | ctx.getChannel().close(); |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | @Override |
| 1046 | public String toString() { |
| 1047 | return getSwitchInfoString(); |
| 1048 | } |
| 1049 | |
| 1050 | @Override |
| 1051 | public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) |
| 1052 | throws Exception { |
| 1053 | OFFactory factory = (ofVersion == OFVersion.OF_13) ? factory13 : factory10; |
| 1054 | OFMessage m = factory.buildEchoRequest().build(); |
| 1055 | log.info("Sending Echo Request on idle channel: {}", |
| 1056 | e.getChannel().getPipeline().getLast().toString()); |
| 1057 | e.getChannel().write(Collections.singletonList(m)); |
| 1058 | // XXX S some problems here -- echo request has no transaction id, and |
| 1059 | // echo reply is not correlated to the echo request. |
| 1060 | } |
| 1061 | |
| 1062 | @Override |
| 1063 | public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) |
| 1064 | throws Exception { |
| 1065 | if (e.getMessage() instanceof List) { |
| 1066 | @SuppressWarnings("unchecked") |
| 1067 | List<OFMessage> msglist = (List<OFMessage>) e.getMessage(); |
| 1068 | |
| 1069 | |
| 1070 | for (OFMessage ofm : msglist) { |
| 1071 | // Do the actual packet processing |
| 1072 | state.processOFMessage(this, ofm); |
| 1073 | } |
| 1074 | } else { |
| 1075 | state.processOFMessage(this, (OFMessage) e.getMessage()); |
| 1076 | } |
| 1077 | } |
| 1078 | |
| 1079 | |
| 1080 | |
| 1081 | //************************* |
| 1082 | // Channel utility methods |
| 1083 | //************************* |
| 1084 | |
| 1085 | /** |
| 1086 | * Is this a state in which the handshake has completed? |
| 1087 | * @return true if the handshake is complete |
| 1088 | */ |
| 1089 | public boolean isHandshakeComplete() { |
| 1090 | return this.state.isHandshakeComplete(); |
| 1091 | } |
| 1092 | |
| 1093 | private void dispatchMessage(OFMessage m) { |
| 1094 | sw.handleMessage(m); |
| 1095 | } |
| 1096 | |
| 1097 | /** |
| 1098 | * Return a string describing this switch based on the already available |
| 1099 | * information (DPID and/or remote socket). |
| 1100 | * @return display string |
| 1101 | */ |
| 1102 | private String getSwitchInfoString() { |
| 1103 | if (sw != null) { |
| 1104 | return sw.toString(); |
| 1105 | } |
| 1106 | String channelString; |
| 1107 | if (channel == null || channel.getRemoteAddress() == null) { |
| 1108 | channelString = "?"; |
| 1109 | } else { |
| 1110 | channelString = channel.getRemoteAddress().toString(); |
| 1111 | } |
| 1112 | String dpidString; |
| 1113 | if (featuresReply == null) { |
| 1114 | dpidString = "?"; |
| 1115 | } else { |
| 1116 | dpidString = featuresReply.getDatapathId().toString(); |
| 1117 | } |
| 1118 | return String.format("[%s DPID[%s]]", channelString, dpidString); |
| 1119 | } |
| 1120 | |
| 1121 | /** |
| 1122 | * Update the channels state. Only called from the state machine. |
| 1123 | * TODO: enforce restricted state transitions |
| 1124 | * @param state |
| 1125 | */ |
| 1126 | private void setState(ChannelState state) { |
| 1127 | this.state = state; |
| 1128 | } |
| 1129 | |
| 1130 | /** |
| 1131 | * Send hello message to the switch using the handshake transactions ids. |
| 1132 | * @throws IOException |
| 1133 | */ |
| 1134 | private void sendHandshakeHelloMessage() throws IOException { |
| 1135 | // The OF protocol requires us to start things off by sending the highest |
| 1136 | // version of the protocol supported. |
| 1137 | |
| 1138 | // bitmap represents OF1.0 (ofp_version=0x01) and OF1.3 (ofp_version=0x04) |
| 1139 | // see Sec. 7.5.1 of the OF1.3.4 spec |
| 1140 | U32 bitmap = U32.ofRaw(0x00000012); |
| 1141 | OFHelloElem hem = factory13.buildHelloElemVersionbitmap() |
| 1142 | .setBitmaps(Collections.singletonList(bitmap)) |
| 1143 | .build(); |
| 1144 | OFMessage.Builder mb = factory13.buildHello() |
| 1145 | .setXid(this.handshakeTransactionIds--) |
| 1146 | .setElements(Collections.singletonList(hem)); |
| 1147 | log.info("Sending OF_13 Hello to {}", channel.getRemoteAddress()); |
| 1148 | channel.write(Collections.singletonList(mb.build())); |
| 1149 | } |
| 1150 | |
| 1151 | /** |
| 1152 | * Send featuresRequest msg to the switch using the handshake transactions ids. |
| 1153 | * @throws IOException |
| 1154 | */ |
| 1155 | private void sendHandshakeFeaturesRequestMessage() throws IOException { |
| 1156 | OFFactory factory = (ofVersion == OFVersion.OF_13) ? factory13 : factory10; |
| 1157 | OFMessage m = factory.buildFeaturesRequest() |
| 1158 | .setXid(this.handshakeTransactionIds--) |
| 1159 | .build(); |
| 1160 | channel.write(Collections.singletonList(m)); |
| 1161 | } |
| 1162 | |
| 1163 | /** |
| 1164 | * Send the configuration requests to tell the switch we want full |
| 1165 | * packets. |
| 1166 | * @throws IOException |
| 1167 | */ |
| 1168 | private void sendHandshakeSetConfig() throws IOException { |
| 1169 | OFFactory factory = (ofVersion == OFVersion.OF_13) ? factory13 : factory10; |
| 1170 | //log.debug("Sending CONFIG_REQUEST to {}", channel.getRemoteAddress()); |
| 1171 | List<OFMessage> msglist = new ArrayList<OFMessage>(3); |
| 1172 | |
| 1173 | // Ensure we receive the full packet via PacketIn |
| 1174 | // FIXME: We don't set the reassembly flags. |
| 1175 | OFSetConfig sc = factory |
| 1176 | .buildSetConfig() |
| 1177 | .setMissSendLen((short) 0xffff) |
| 1178 | .setXid(this.handshakeTransactionIds--) |
| 1179 | .build(); |
| 1180 | msglist.add(sc); |
| 1181 | |
| 1182 | // Barrier |
| 1183 | OFBarrierRequest br = factory |
| 1184 | .buildBarrierRequest() |
| 1185 | .setXid(this.handshakeTransactionIds--) |
| 1186 | .build(); |
| 1187 | msglist.add(br); |
| 1188 | |
| 1189 | // Verify (need barrier?) |
| 1190 | OFGetConfigRequest gcr = factory |
| 1191 | .buildGetConfigRequest() |
| 1192 | .setXid(this.handshakeTransactionIds--) |
| 1193 | .build(); |
| 1194 | msglist.add(gcr); |
| 1195 | channel.write(msglist); |
| 1196 | } |
| 1197 | |
| 1198 | /** |
| 1199 | * send a description state request. |
| 1200 | * @throws IOException |
| 1201 | */ |
| 1202 | private void sendHandshakeDescriptionStatsRequest() throws IOException { |
| 1203 | // Get Description to set switch-specific flags |
| 1204 | OFFactory factory = (ofVersion == OFVersion.OF_13) ? factory13 : factory10; |
| 1205 | OFDescStatsRequest dreq = factory |
| 1206 | .buildDescStatsRequest() |
| 1207 | .setXid(handshakeTransactionIds--) |
| 1208 | .build(); |
| 1209 | channel.write(Collections.singletonList(dreq)); |
| 1210 | } |
| 1211 | |
| 1212 | private void sendHandshakeOFPortDescRequest() throws IOException { |
| 1213 | // Get port description for 1.3 switch |
| 1214 | OFPortDescStatsRequest preq = factory13 |
| 1215 | .buildPortDescStatsRequest() |
| 1216 | .setXid(handshakeTransactionIds--) |
| 1217 | .build(); |
| 1218 | channel.write(Collections.singletonList(preq)); |
| 1219 | } |
| 1220 | |
| 1221 | ChannelState getStateForTesting() { |
| 1222 | return state; |
| 1223 | } |
| 1224 | |
| 1225 | } |