Andreas Papazois | a9964ea | 2016-01-08 15:58:22 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016 Open Networking Laboratory |
| 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 | package org.onosproject.sdxl3; |
| 17 | |
| 18 | import org.onlab.packet.ARP; |
| 19 | import org.onlab.packet.Ethernet; |
| 20 | import org.onlab.packet.ICMP6; |
| 21 | import org.onlab.packet.IPv6; |
| 22 | import org.onlab.packet.Ip4Address; |
| 23 | import org.onlab.packet.Ip6Address; |
| 24 | import org.onlab.packet.IpAddress; |
| 25 | import org.onlab.packet.MacAddress; |
| 26 | import org.onlab.packet.VlanId; |
| 27 | import org.onlab.packet.ndp.NeighborAdvertisement; |
| 28 | import org.onlab.packet.ndp.NeighborDiscoveryOptions; |
| 29 | import org.onlab.packet.ndp.NeighborSolicitation; |
| 30 | import org.onosproject.incubator.net.intf.Interface; |
| 31 | import org.onosproject.incubator.net.intf.InterfaceService; |
| 32 | import org.onosproject.net.ConnectPoint; |
| 33 | import org.onosproject.net.Host; |
| 34 | import org.onosproject.net.edge.EdgePortService; |
| 35 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 36 | import org.onosproject.net.flow.TrafficTreatment; |
| 37 | import org.onosproject.net.host.HostService; |
| 38 | import org.onosproject.net.packet.DefaultOutboundPacket; |
| 39 | import org.onosproject.net.packet.InboundPacket; |
| 40 | import org.onosproject.net.packet.PacketService; |
| 41 | import org.onosproject.routing.config.BgpConfig; |
| 42 | |
| 43 | import java.nio.ByteBuffer; |
| 44 | import java.util.Set; |
| 45 | import java.util.stream.Collectors; |
| 46 | |
| 47 | import static com.google.common.base.Preconditions.checkArgument; |
| 48 | import static com.google.common.base.Preconditions.checkNotNull; |
| 49 | import static org.onosproject.net.HostId.hostId; |
| 50 | import static org.onosproject.security.AppGuard.checkPermission; |
| 51 | import static org.onosproject.security.AppPermission.Type.PACKET_WRITE; |
| 52 | |
| 53 | public class SdxL3ArpHandler { |
| 54 | |
| 55 | private static final String REQUEST_NULL = "ARP or NDP request cannot be null."; |
| 56 | private static final String MSG_NOT_REQUEST = "Message is not an ARP or NDP request"; |
| 57 | |
| 58 | private BgpConfig bgpConfig; |
| 59 | private EdgePortService edgeService; |
| 60 | private HostService hostService; |
| 61 | private PacketService packetService; |
| 62 | private InterfaceService interfaceService; |
| 63 | |
| 64 | private enum Protocol { |
| 65 | ARP, NDP |
| 66 | } |
| 67 | |
| 68 | private enum MessageType { |
| 69 | REQUEST, REPLY |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Creates an ArpHandler object. |
| 74 | * |
| 75 | */ |
| 76 | public SdxL3ArpHandler(BgpConfig bgpConfig, |
| 77 | EdgePortService edgeService, |
| 78 | HostService hostService, |
| 79 | PacketService packetService, |
| 80 | InterfaceService interfaceService) { |
| 81 | this.bgpConfig = bgpConfig; |
| 82 | this.edgeService = edgeService; |
| 83 | this.hostService = hostService; |
| 84 | this.packetService = packetService; |
| 85 | this.interfaceService = interfaceService; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Processes incoming ARP packets. |
| 90 | * |
| 91 | * @param pkt incoming packet |
| 92 | */ |
| 93 | public void processPacketIn(InboundPacket pkt) { |
| 94 | checkPermission(PACKET_WRITE); |
| 95 | |
| 96 | Ethernet eth = pkt.parsed(); |
| 97 | checkNotNull(eth, REQUEST_NULL); |
| 98 | |
| 99 | ConnectPoint inPort = pkt.receivedFrom(); |
| 100 | MessageContext context = createContext(eth, inPort); |
| 101 | if (context != null) { |
| 102 | replyInternal(context); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Handles a request message also when it concerns an SDX peering address. |
| 108 | * |
| 109 | * If the MAC address of the target is known, we can reply directly to the |
| 110 | * requestor. Otherwise, we forward the request out other ports in an |
| 111 | * attempt to find the correct host. |
| 112 | * |
| 113 | * @param context request message context to process |
| 114 | */ |
| 115 | private void replyInternal(MessageContext context) { |
| 116 | checkNotNull(context); |
| 117 | checkArgument(context.type() == MessageType.REQUEST, MSG_NOT_REQUEST); |
| 118 | |
| 119 | if (hasIpAddress(context.inPort())) { |
| 120 | // If the request came from outside the network, only reply if it was |
| 121 | // for one of our external addresses. |
| 122 | |
| 123 | interfaceService.getInterfacesByPort(context.inPort()) |
| 124 | .stream() |
| 125 | .filter(intf -> intf.ipAddresses() |
| 126 | .stream() |
| 127 | .anyMatch(ia -> ia.ipAddress().equals(context.target()))) |
| 128 | .forEach(intf -> buildAndSendReply(context, intf.mac())); |
| 129 | |
| 130 | if (!isPeerAddress(context.sender()) || !isPeerAddress(context.target())) { |
| 131 | // Only care about requests from/towards external BGP peers |
| 132 | return; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | // See if we have the target host in the host store |
| 137 | Set<Host> hosts = hostService.getHostsByIp(context.target()); |
| 138 | |
| 139 | Host dst = null; |
| 140 | Host src = hostService.getHost(hostId(context.srcMac(), context.vlan())); |
| 141 | |
| 142 | for (Host host : hosts) { |
| 143 | if (host.vlan().equals(context.vlan())) { |
| 144 | dst = host; |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | if (src != null && dst != null) { |
| 150 | // We know the target host so we can respond |
| 151 | buildAndSendReply(context, dst.mac()); |
| 152 | return; |
| 153 | } |
| 154 | |
| 155 | // If the source address matches one of our external addresses |
| 156 | // it could be a request from an internal host to an external |
| 157 | // address. Forward it over to the correct port. |
| 158 | boolean matched = false; |
| 159 | Set<Interface> interfaces = interfaceService.getInterfacesByIp(context.sender()); |
| 160 | for (Interface intf : interfaces) { |
| 161 | if (intf.vlan().equals(context.vlan())) { |
| 162 | matched = true; |
| 163 | sendTo(context.packet(), intf.connectPoint()); |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (matched) { |
| 169 | return; |
| 170 | } |
| 171 | |
| 172 | // If the packets has a vlanId look if there are some other |
| 173 | // interfaces in the configuration on the same vlan and broadcast |
| 174 | // the packet out just of through those interfaces. |
| 175 | VlanId vlanId = context.vlan(); |
| 176 | |
| 177 | Set<Interface> filteredVlanInterfaces = |
| 178 | filterVlanInterfacesNoIp(interfaceService.getInterfacesByVlan(vlanId)); |
| 179 | |
| 180 | if (vlanId != null |
| 181 | && !vlanId.equals(VlanId.NONE) |
| 182 | && confContainsVlans(vlanId, context.inPort())) { |
| 183 | vlanFlood(context.packet(), filteredVlanInterfaces, context.inPort); |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | // The request couldn't be resolved. |
| 188 | // Flood the request on all ports except the incoming port. |
| 189 | flood(context.packet(), context.inPort()); |
| 190 | } |
| 191 | |
| 192 | private boolean isPeerAddress(IpAddress ip) { |
| 193 | return bgpConfig.bgpSpeakers() |
| 194 | .stream() |
| 195 | .flatMap(speaker -> speaker.peers().stream()) |
| 196 | .anyMatch(peerAddress -> peerAddress.equals(ip)); |
| 197 | } |
| 198 | |
| 199 | private Set<Interface> filterVlanInterfacesNoIp(Set<Interface> vlanInterfaces) { |
| 200 | return vlanInterfaces |
| 201 | .stream() |
| 202 | .filter(intf -> intf.ipAddresses().isEmpty()) |
| 203 | .collect(Collectors.toSet()); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * States if the interface configuration contains more than one interface configured |
| 208 | * on a specific vlan, including the interface passed as argument. |
| 209 | * |
| 210 | * @param vlanId the vlanid to look for in the interface configuration |
| 211 | * @param connectPoint the connect point to exclude from the search |
| 212 | * @return true if interfaces are found. False otherwise |
| 213 | */ |
| 214 | private boolean confContainsVlans(VlanId vlanId, ConnectPoint connectPoint) { |
| 215 | Set<Interface> vlanInterfaces = interfaceService.getInterfacesByVlan(vlanId); |
| 216 | return interfaceService.getInterfacesByVlan(vlanId) |
| 217 | .stream() |
| 218 | .anyMatch(intf -> intf.connectPoint().equals(connectPoint) && intf.ipAddresses().isEmpty()) |
| 219 | && vlanInterfaces.size() > 1; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Builds and sends a reply message given a request context and the resolved |
| 224 | * MAC address to answer with. |
| 225 | * |
| 226 | * @param context message context of request |
| 227 | * @param targetMac MAC address to be given in the response |
| 228 | */ |
| 229 | private void buildAndSendReply(MessageContext context, MacAddress targetMac) { |
| 230 | switch (context.protocol()) { |
| 231 | case ARP: |
| 232 | sendTo(ARP.buildArpReply((Ip4Address) context.target(), |
| 233 | targetMac, context.packet()), context.inPort()); |
| 234 | break; |
| 235 | case NDP: |
| 236 | sendTo(buildNdpReply((Ip6Address) context.target(), targetMac, |
| 237 | context.packet()), context.inPort()); |
| 238 | break; |
| 239 | default: |
| 240 | break; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Outputs a packet out a specific port. |
| 246 | * |
| 247 | * @param packet the packet to send |
| 248 | * @param outPort the port to send it out |
| 249 | */ |
| 250 | private void sendTo(Ethernet packet, ConnectPoint outPort) { |
| 251 | sendTo(outPort, ByteBuffer.wrap(packet.serialize())); |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Outputs a packet out a specific port. |
| 256 | * |
| 257 | * @param outPort port to send it out |
| 258 | * @param packet packet to send |
| 259 | */ |
| 260 | private void sendTo(ConnectPoint outPort, ByteBuffer packet) { |
| 261 | if (!edgeService.isEdgePoint(outPort)) { |
| 262 | // Sanity check to make sure we don't send the packet out an |
| 263 | // internal port and create a loop (could happen due to |
| 264 | // misconfiguration). |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | TrafficTreatment.Builder builder = DefaultTrafficTreatment.builder(); |
| 269 | builder.setOutput(outPort.port()); |
| 270 | packetService.emit(new DefaultOutboundPacket(outPort.deviceId(), |
| 271 | builder.build(), packet)); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Returns whether the given port has any IP addresses configured or not. |
| 276 | * |
| 277 | * @param connectPoint the port to check |
| 278 | * @return true if the port has at least one IP address configured, |
| 279 | * false otherwise |
| 280 | */ |
| 281 | private boolean hasIpAddress(ConnectPoint connectPoint) { |
| 282 | return interfaceService.getInterfacesByPort(connectPoint) |
| 283 | .stream() |
| 284 | .flatMap(intf -> intf.ipAddresses().stream()) |
| 285 | .findAny() |
| 286 | .isPresent(); |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Returns whether the given port has any VLAN configured or not. |
| 291 | * |
| 292 | * @param connectPoint the port to check |
| 293 | * @return true if the port has at least one VLAN configured, |
| 294 | * false otherwise |
| 295 | */ |
| 296 | private boolean hasVlan(ConnectPoint connectPoint) { |
| 297 | return interfaceService.getInterfacesByPort(connectPoint) |
| 298 | .stream() |
| 299 | .filter(intf -> !intf.vlan().equals(VlanId.NONE)) |
| 300 | .findAny() |
| 301 | .isPresent(); |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Flood the arp request at all edges on a specifc VLAN. |
| 306 | * |
| 307 | * @param request the arp request |
| 308 | * @param dsts the destination interfaces |
| 309 | * @param inPort the connect point the arp request was received on |
| 310 | */ |
| 311 | private void vlanFlood(Ethernet request, Set<Interface> dsts, ConnectPoint inPort) { |
| 312 | TrafficTreatment.Builder builder = null; |
| 313 | ByteBuffer buf = ByteBuffer.wrap(request.serialize()); |
| 314 | |
| 315 | for (Interface intf : dsts) { |
| 316 | ConnectPoint cPoint = intf.connectPoint(); |
| 317 | if (cPoint.equals(inPort)) { |
| 318 | continue; |
| 319 | } |
| 320 | |
| 321 | builder = DefaultTrafficTreatment.builder(); |
| 322 | builder.setOutput(cPoint.port()); |
| 323 | packetService.emit(new DefaultOutboundPacket(cPoint.deviceId(), |
| 324 | builder.build(), buf)); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Flood the arp request at all edges in the network. |
| 330 | * |
| 331 | * @param request the arp request |
| 332 | * @param inPort the connect point the arp request was received on |
| 333 | */ |
| 334 | private void flood(Ethernet request, ConnectPoint inPort) { |
| 335 | TrafficTreatment.Builder builder = null; |
| 336 | ByteBuffer buf = ByteBuffer.wrap(request.serialize()); |
| 337 | |
| 338 | for (ConnectPoint connectPoint : edgeService.getEdgePoints()) { |
| 339 | if (hasIpAddress(connectPoint) |
| 340 | || hasVlan(connectPoint) |
| 341 | || connectPoint.equals(inPort)) { |
| 342 | continue; |
| 343 | } |
| 344 | |
| 345 | builder = DefaultTrafficTreatment.builder(); |
| 346 | builder.setOutput(connectPoint.port()); |
| 347 | packetService.emit(new DefaultOutboundPacket(connectPoint.deviceId(), |
| 348 | builder.build(), buf)); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Builds an Neighbor Discovery reply based on a request. |
| 354 | * |
| 355 | * @param srcIp the IP address to use as the reply source |
| 356 | * @param srcMac the MAC address to use as the reply source |
| 357 | * @param request the Neighbor Solicitation request we got |
| 358 | * @return an Ethernet frame containing the Neighbor Advertisement reply |
| 359 | */ |
| 360 | private Ethernet buildNdpReply(Ip6Address srcIp, MacAddress srcMac, |
| 361 | Ethernet request) { |
| 362 | Ethernet eth = new Ethernet(); |
| 363 | eth.setDestinationMACAddress(request.getSourceMAC()); |
| 364 | eth.setSourceMACAddress(srcMac); |
| 365 | eth.setEtherType(Ethernet.TYPE_IPV6); |
| 366 | eth.setVlanID(request.getVlanID()); |
| 367 | |
| 368 | IPv6 requestIp = (IPv6) request.getPayload(); |
| 369 | IPv6 ipv6 = new IPv6(); |
| 370 | ipv6.setSourceAddress(srcIp.toOctets()); |
| 371 | ipv6.setDestinationAddress(requestIp.getSourceAddress()); |
| 372 | ipv6.setHopLimit((byte) 255); |
| 373 | |
| 374 | ICMP6 icmp6 = new ICMP6(); |
| 375 | icmp6.setIcmpType(ICMP6.NEIGHBOR_ADVERTISEMENT); |
| 376 | icmp6.setIcmpCode((byte) 0); |
| 377 | |
| 378 | NeighborAdvertisement nadv = new NeighborAdvertisement(); |
| 379 | nadv.setTargetAddress(srcIp.toOctets()); |
| 380 | nadv.setSolicitedFlag((byte) 1); |
| 381 | nadv.setOverrideFlag((byte) 1); |
| 382 | nadv.addOption(NeighborDiscoveryOptions.TYPE_TARGET_LL_ADDRESS, |
| 383 | srcMac.toBytes()); |
| 384 | |
| 385 | icmp6.setPayload(nadv); |
| 386 | ipv6.setPayload(icmp6); |
| 387 | eth.setPayload(ipv6); |
| 388 | return eth; |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Attempts to create a MessageContext for the given Ethernet frame. If the |
| 393 | * frame is a valid ARP or NDP request or response, a context will be |
| 394 | * created. |
| 395 | * |
| 396 | * @param eth input Ethernet frame |
| 397 | * @param inPort in port |
| 398 | * @return MessageContext if the packet was ARP or NDP, otherwise null |
| 399 | */ |
| 400 | private MessageContext createContext(Ethernet eth, ConnectPoint inPort) { |
| 401 | if (eth.getEtherType() == Ethernet.TYPE_ARP) { |
| 402 | return createArpContext(eth, inPort); |
| 403 | } else if (eth.getEtherType() == Ethernet.TYPE_IPV6) { |
| 404 | return createNdpContext(eth, inPort); |
| 405 | } |
| 406 | |
| 407 | return null; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * Extracts context information from ARP packets. |
| 412 | * |
| 413 | * @param eth input Ethernet frame that is thought to be ARP |
| 414 | * @param inPort in port |
| 415 | * @return MessageContext object if the packet was a valid ARP packet, |
| 416 | * otherwise null |
| 417 | */ |
| 418 | private MessageContext createArpContext(Ethernet eth, ConnectPoint inPort) { |
| 419 | if (eth.getEtherType() != Ethernet.TYPE_ARP) { |
| 420 | return null; |
| 421 | } |
| 422 | |
| 423 | ARP arp = (ARP) eth.getPayload(); |
| 424 | |
| 425 | IpAddress target = Ip4Address.valueOf(arp.getTargetProtocolAddress()); |
| 426 | IpAddress sender = Ip4Address.valueOf(arp.getSenderProtocolAddress()); |
| 427 | |
| 428 | MessageType type; |
| 429 | if (arp.getOpCode() == ARP.OP_REQUEST) { |
| 430 | type = MessageType.REQUEST; |
| 431 | } else if (arp.getOpCode() == ARP.OP_REPLY) { |
| 432 | type = MessageType.REPLY; |
| 433 | } else { |
| 434 | return null; |
| 435 | } |
| 436 | |
| 437 | return new MessageContext(eth, inPort, Protocol.ARP, type, target, sender); |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Extracts context information from NDP packets. |
| 442 | * |
| 443 | * @param eth input Ethernet frame that is thought to be NDP |
| 444 | * @param inPort in port |
| 445 | * @return MessageContext object if the packet was a valid NDP packet, |
| 446 | * otherwise null |
| 447 | */ |
| 448 | private MessageContext createNdpContext(Ethernet eth, ConnectPoint inPort) { |
| 449 | if (eth.getEtherType() != Ethernet.TYPE_IPV6) { |
| 450 | return null; |
| 451 | } |
| 452 | IPv6 ipv6 = (IPv6) eth.getPayload(); |
| 453 | |
| 454 | if (ipv6.getNextHeader() != IPv6.PROTOCOL_ICMP6) { |
| 455 | return null; |
| 456 | } |
| 457 | ICMP6 icmpv6 = (ICMP6) ipv6.getPayload(); |
| 458 | |
| 459 | IpAddress sender = Ip6Address.valueOf(ipv6.getSourceAddress()); |
| 460 | IpAddress target = null; |
| 461 | |
| 462 | MessageType type; |
| 463 | if (icmpv6.getIcmpType() == ICMP6.NEIGHBOR_SOLICITATION) { |
| 464 | type = MessageType.REQUEST; |
| 465 | NeighborSolicitation nsol = (NeighborSolicitation) icmpv6.getPayload(); |
| 466 | target = Ip6Address.valueOf(nsol.getTargetAddress()); |
| 467 | } else if (icmpv6.getIcmpType() == ICMP6.NEIGHBOR_ADVERTISEMENT) { |
| 468 | type = MessageType.REPLY; |
| 469 | } else { |
| 470 | return null; |
| 471 | } |
| 472 | |
| 473 | return new MessageContext(eth, inPort, Protocol.NDP, type, target, sender); |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Provides context information for a particular ARP or NDP message, with |
| 478 | * a unified interface to access data regardless of protocol. |
| 479 | */ |
| 480 | private class MessageContext { |
| 481 | private Protocol protocol; |
| 482 | private MessageType type; |
| 483 | |
| 484 | private IpAddress target; |
| 485 | private IpAddress sender; |
| 486 | |
| 487 | private Ethernet eth; |
| 488 | private ConnectPoint inPort; |
| 489 | |
| 490 | |
| 491 | public MessageContext(Ethernet eth, ConnectPoint inPort, |
| 492 | Protocol protocol, MessageType type, |
| 493 | IpAddress target, IpAddress sender) { |
| 494 | this.eth = eth; |
| 495 | this.inPort = inPort; |
| 496 | this.protocol = protocol; |
| 497 | this.type = type; |
| 498 | this.target = target; |
| 499 | this.sender = sender; |
| 500 | } |
| 501 | |
| 502 | public ConnectPoint inPort() { |
| 503 | return inPort; |
| 504 | } |
| 505 | |
| 506 | public Ethernet packet() { |
| 507 | return eth; |
| 508 | } |
| 509 | |
| 510 | public Protocol protocol() { |
| 511 | return protocol; |
| 512 | } |
| 513 | |
| 514 | public MessageType type() { |
| 515 | return type; |
| 516 | } |
| 517 | |
| 518 | public VlanId vlan() { |
| 519 | return VlanId.vlanId(eth.getVlanID()); |
| 520 | } |
| 521 | |
| 522 | public MacAddress srcMac() { |
| 523 | return MacAddress.valueOf(eth.getSourceMACAddress()); |
| 524 | } |
| 525 | |
| 526 | public IpAddress target() { |
| 527 | return target; |
| 528 | } |
| 529 | |
| 530 | public IpAddress sender() { |
| 531 | return sender; |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | } |