samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 | */ |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 16 | package org.onosproject.dhcpserver.impl; |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 17 | |
| 18 | import org.apache.felix.scr.annotations.Activate; |
| 19 | import org.apache.felix.scr.annotations.Component; |
| 20 | import org.apache.felix.scr.annotations.Deactivate; |
| 21 | import org.apache.felix.scr.annotations.Reference; |
| 22 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 23 | import org.apache.felix.scr.annotations.Service; |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 24 | import org.onlab.packet.DHCP; |
| 25 | import org.onlab.packet.DHCPOption; |
| 26 | import org.onlab.packet.Ethernet; |
| 27 | import org.onlab.packet.IPv4; |
| 28 | import org.onlab.packet.Ip4Address; |
| 29 | import org.onlab.packet.MacAddress; |
| 30 | import org.onlab.packet.UDP; |
| 31 | import org.onosproject.core.ApplicationId; |
| 32 | import org.onosproject.core.CoreService; |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 33 | import org.onosproject.dhcpserver.DHCPService; |
| 34 | import org.onosproject.dhcpserver.DHCPStore; |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 35 | import org.onosproject.net.ConnectPoint; |
| 36 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 37 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 38 | import org.onosproject.net.flow.TrafficSelector; |
| 39 | import org.onosproject.net.flow.TrafficTreatment; |
| 40 | import org.onosproject.net.packet.DefaultOutboundPacket; |
| 41 | import org.onosproject.net.packet.PacketContext; |
| 42 | import org.onosproject.net.packet.PacketPriority; |
| 43 | import org.onosproject.net.packet.PacketProcessor; |
| 44 | import org.onosproject.net.packet.PacketService; |
| 45 | import org.slf4j.Logger; |
| 46 | import org.slf4j.LoggerFactory; |
| 47 | |
| 48 | import java.nio.ByteBuffer; |
| 49 | import java.util.ArrayList; |
| 50 | import java.util.List; |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 51 | import java.util.Map; |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 52 | |
| 53 | import static org.onlab.packet.MacAddress.valueOf; |
| 54 | |
| 55 | /** |
| 56 | * Skeletal ONOS DHCP Server application. |
| 57 | */ |
| 58 | @Component(immediate = true) |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 59 | @Service |
| 60 | public class DHCPManager implements DHCPService { |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 61 | |
| 62 | private final Logger log = LoggerFactory.getLogger(getClass()); |
| 63 | |
| 64 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 65 | protected PacketService packetService; |
| 66 | |
| 67 | private DHCPPacketProcessor processor = new DHCPPacketProcessor(); |
| 68 | |
| 69 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 70 | protected CoreService coreService; |
| 71 | |
| 72 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 73 | protected DHCPStore dhcpStore; |
| 74 | |
| 75 | private ApplicationId appId; |
| 76 | |
| 77 | // TODO Make the hardcoded values configurable. |
| 78 | |
| 79 | private static final String MY_IP = "10.0.0.2"; |
| 80 | |
| 81 | private static final MacAddress MY_MAC = valueOf("4f:4f:4f:4f:4f:4f"); |
| 82 | |
| 83 | /** |
| 84 | * leaseTime - 10 mins or 600s. |
| 85 | * renewalTime - 5 mins or 300s. |
| 86 | * rebindingTime - 6 mins or 360s. |
| 87 | */ |
| 88 | |
| 89 | private static int leaseTime = 600; |
| 90 | |
| 91 | private static int renewalTime = 300; |
| 92 | |
| 93 | private static int rebindingTime = 360; |
| 94 | |
| 95 | private static byte packetTTL = (byte) 127; |
| 96 | |
| 97 | private static String subnetMask = "255.0.0.0"; |
| 98 | |
| 99 | private static String broadcastAddress = "10.255.255.255"; |
| 100 | |
| 101 | @Activate |
| 102 | protected void activate() { |
| 103 | // start the dhcp server |
| 104 | appId = coreService.registerApplication("org.onosproject.dhcpserver"); |
| 105 | |
| 106 | packetService.addProcessor(processor, PacketProcessor.ADVISOR_MAX + 10); |
| 107 | requestPackets(); |
| 108 | log.info("Started"); |
| 109 | } |
| 110 | |
| 111 | @Deactivate |
| 112 | protected void deactivate() { |
| 113 | packetService.removeProcessor(processor); |
| 114 | |
| 115 | TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| 116 | .matchEthType(Ethernet.TYPE_IPV4) |
| 117 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
| 118 | .matchUdpDst(UDP.DHCP_SERVER_PORT) |
| 119 | .matchUdpSrc(UDP.DHCP_CLIENT_PORT); |
| 120 | |
| 121 | packetService.cancelPackets(selectorServer.build(), PacketPriority.CONTROL, appId); |
| 122 | log.info("Stopped"); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Request packet in via PacketService. |
| 127 | */ |
| 128 | private void requestPackets() { |
| 129 | |
| 130 | TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| 131 | .matchEthType(Ethernet.TYPE_IPV4) |
| 132 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
| 133 | .matchUdpDst(UDP.DHCP_SERVER_PORT) |
| 134 | .matchUdpSrc(UDP.DHCP_CLIENT_PORT); |
| 135 | |
| 136 | packetService.requestPackets(selectorServer.build(), |
| 137 | PacketPriority.CONTROL, appId); |
| 138 | } |
| 139 | |
samanwita pal | f66ed8a | 2015-07-21 15:45:33 -0700 | [diff] [blame^] | 140 | @Override |
| 141 | public Map<MacAddress, Ip4Address> listMapping() { |
| 142 | |
| 143 | return dhcpStore.listMapping(); |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | public int getLeaseTime() { |
| 148 | return leaseTime; |
| 149 | } |
| 150 | |
| 151 | @Override |
| 152 | public int getRenewalTime() { |
| 153 | return renewalTime; |
| 154 | } |
| 155 | |
| 156 | @Override |
| 157 | public int getRebindingTime() { |
| 158 | return rebindingTime; |
| 159 | } |
| 160 | |
| 161 | @Override |
| 162 | public boolean setStaticMapping(MacAddress macID, Ip4Address ipAddress) { |
| 163 | return dhcpStore.assignStaticIP(macID, ipAddress); |
| 164 | } |
| 165 | |
| 166 | @Override |
| 167 | public boolean removeStaticMapping(MacAddress macID) { |
| 168 | return dhcpStore.removeStaticIP(macID); |
| 169 | } |
| 170 | |
| 171 | @Override |
| 172 | public Iterable<Ip4Address> getAvailableIPs() { |
| 173 | return dhcpStore.getAvailableIPs(); |
| 174 | } |
| 175 | |
samanwita pal | 18696f6 | 2015-07-17 13:15:43 -0700 | [diff] [blame] | 176 | private class DHCPPacketProcessor implements PacketProcessor { |
| 177 | |
| 178 | /** |
| 179 | * Builds the DHCP Reply packet. |
| 180 | * |
| 181 | * @param packet the incoming Ethernet frame |
| 182 | * @param ipOffered the IP offered by the DHCP Server |
| 183 | * @param outgoingMessageType the message type of the outgoing packet |
| 184 | * @return the Ethernet reply frame |
| 185 | */ |
| 186 | private Ethernet buildReply(Ethernet packet, String ipOffered, byte outgoingMessageType) { |
| 187 | Ip4Address myIPAddress = Ip4Address.valueOf(MY_IP); |
| 188 | Ip4Address ipAddress; |
| 189 | |
| 190 | // Ethernet Frame. |
| 191 | Ethernet ethReply = new Ethernet(); |
| 192 | ethReply.setSourceMACAddress(MY_MAC); |
| 193 | ethReply.setDestinationMACAddress(packet.getSourceMAC()); |
| 194 | ethReply.setEtherType(Ethernet.TYPE_IPV4); |
| 195 | ethReply.setVlanID(packet.getVlanID()); |
| 196 | |
| 197 | // IP Packet |
| 198 | IPv4 ipv4Packet = (IPv4) packet.getPayload(); |
| 199 | IPv4 ipv4Reply = new IPv4(); |
| 200 | ipv4Reply.setSourceAddress(myIPAddress.toInt()); |
| 201 | ipAddress = Ip4Address.valueOf(ipOffered); |
| 202 | ipv4Reply.setDestinationAddress(ipAddress.toInt()); |
| 203 | ipv4Reply.setTtl(packetTTL); |
| 204 | |
| 205 | // UDP Datagram. |
| 206 | UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| 207 | UDP udpReply = new UDP(); |
| 208 | udpReply.setSourcePort((byte) UDP.DHCP_SERVER_PORT); |
| 209 | udpReply.setDestinationPort((byte) UDP.DHCP_CLIENT_PORT); |
| 210 | |
| 211 | // DHCP Payload. |
| 212 | DHCP dhcpPacket = (DHCP) udpPacket.getPayload(); |
| 213 | DHCP dhcpReply = new DHCP(); |
| 214 | dhcpReply.setOpCode(DHCP.OPCODE_REPLY); |
| 215 | |
| 216 | ipAddress = Ip4Address.valueOf(ipOffered); |
| 217 | dhcpReply.setYourIPAddress(ipAddress.toInt()); |
| 218 | dhcpReply.setServerIPAddress(myIPAddress.toInt()); |
| 219 | |
| 220 | dhcpReply.setTransactionId(dhcpPacket.getTransactionId()); |
| 221 | dhcpReply.setClientHardwareAddress(dhcpPacket.getClientHardwareAddress()); |
| 222 | dhcpReply.setHardwareType(DHCP.HWTYPE_ETHERNET); |
| 223 | dhcpReply.setHardwareAddressLength((byte) 6); |
| 224 | |
| 225 | // DHCP Options. |
| 226 | DHCPOption option = new DHCPOption(); |
| 227 | List<DHCPOption> optionList = new ArrayList<>(); |
| 228 | |
| 229 | // DHCP Message Type. |
| 230 | option.setCode(DHCP.DHCPOptionCode.OptionCode_MessageType.getValue()); |
| 231 | option.setLength((byte) 1); |
| 232 | byte[] optionData = {outgoingMessageType}; |
| 233 | option.setData(optionData); |
| 234 | optionList.add(option); |
| 235 | |
| 236 | // DHCP Server Identifier. |
| 237 | option = new DHCPOption(); |
| 238 | option.setCode(DHCP.DHCPOptionCode.OptionCode_DHCPServerIp.getValue()); |
| 239 | option.setLength((byte) 4); |
| 240 | option.setData(myIPAddress.toOctets()); |
| 241 | optionList.add(option); |
| 242 | |
| 243 | // IP Address Lease Time. |
| 244 | option = new DHCPOption(); |
| 245 | option.setCode(DHCP.DHCPOptionCode.OptionCode_LeaseTime.getValue()); |
| 246 | option.setLength((byte) 4); |
| 247 | option.setData(ByteBuffer.allocate(4).putInt(leaseTime).array()); |
| 248 | optionList.add(option); |
| 249 | |
| 250 | // IP Address Renewal Time. |
| 251 | option = new DHCPOption(); |
| 252 | option.setCode(DHCP.DHCPOptionCode.OptionCode_RenewalTime.getValue()); |
| 253 | option.setLength((byte) 4); |
| 254 | option.setData(ByteBuffer.allocate(4).putInt(renewalTime).array()); |
| 255 | optionList.add(option); |
| 256 | |
| 257 | // IP Address Rebinding Time. |
| 258 | option = new DHCPOption(); |
| 259 | option.setCode(DHCP.DHCPOptionCode.OPtionCode_RebindingTime.getValue()); |
| 260 | option.setLength((byte) 4); |
| 261 | option.setData(ByteBuffer.allocate(4).putInt(rebindingTime).array()); |
| 262 | optionList.add(option); |
| 263 | |
| 264 | // Subnet Mask. |
| 265 | option = new DHCPOption(); |
| 266 | option.setCode(DHCP.DHCPOptionCode.OptionCode_SubnetMask.getValue()); |
| 267 | option.setLength((byte) 4); |
| 268 | ipAddress = Ip4Address.valueOf(subnetMask); |
| 269 | option.setData(ipAddress.toOctets()); |
| 270 | optionList.add(option); |
| 271 | |
| 272 | // Broadcast Address. |
| 273 | option = new DHCPOption(); |
| 274 | option.setCode(DHCP.DHCPOptionCode.OptionCode_BroadcastAddress.getValue()); |
| 275 | option.setLength((byte) 4); |
| 276 | ipAddress = Ip4Address.valueOf(broadcastAddress); |
| 277 | option.setData(ipAddress.toOctets()); |
| 278 | optionList.add(option); |
| 279 | |
| 280 | // Router Address. |
| 281 | option = new DHCPOption(); |
| 282 | option.setCode(DHCP.DHCPOptionCode.OptionCode_RouterAddress.getValue()); |
| 283 | option.setLength((byte) 4); |
| 284 | option.setData(myIPAddress.toOctets()); |
| 285 | optionList.add(option); |
| 286 | |
| 287 | // DNS Server Address. |
| 288 | option = new DHCPOption(); |
| 289 | option.setCode(DHCP.DHCPOptionCode.OptionCode_DomainServer.getValue()); |
| 290 | option.setLength((byte) 4); |
| 291 | option.setData(myIPAddress.toOctets()); |
| 292 | optionList.add(option); |
| 293 | |
| 294 | // End Option. |
| 295 | option = new DHCPOption(); |
| 296 | option.setCode(DHCP.DHCPOptionCode.OptionCode_END.getValue()); |
| 297 | option.setLength((byte) 1); |
| 298 | optionList.add(option); |
| 299 | |
| 300 | dhcpReply.setOptions(optionList); |
| 301 | |
| 302 | udpReply.setPayload(dhcpReply); |
| 303 | ipv4Reply.setPayload(udpReply); |
| 304 | ethReply.setPayload(ipv4Reply); |
| 305 | |
| 306 | return ethReply; |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * Sends the Ethernet reply frame via the Packet Service. |
| 311 | * |
| 312 | * @param context the context of the incoming frame |
| 313 | * @param reply the Ethernet reply frame |
| 314 | */ |
| 315 | private void sendReply(PacketContext context, Ethernet reply) { |
| 316 | if (reply != null) { |
| 317 | TrafficTreatment.Builder builder = DefaultTrafficTreatment.builder(); |
| 318 | ConnectPoint sourcePoint = context.inPacket().receivedFrom(); |
| 319 | builder.setOutput(sourcePoint.port()); |
| 320 | |
| 321 | packetService.emit(new DefaultOutboundPacket(sourcePoint.deviceId(), |
| 322 | builder.build(), ByteBuffer.wrap(reply.serialize()))); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | /** |
| 327 | * Processes the DHCP Payload and initiates a reply to the client. |
| 328 | * |
| 329 | * @param context context of the incoming message |
| 330 | * @param dhcpPayload the extracted DHCP payload |
| 331 | */ |
| 332 | private void processDHCPPacket(PacketContext context, DHCP dhcpPayload) { |
| 333 | |
| 334 | Ethernet packet = context.inPacket().parsed(); |
| 335 | boolean flagIfRequestedIP = false; |
| 336 | boolean flagIfServerIP = false; |
| 337 | Ip4Address requestedIP = Ip4Address.valueOf("0.0.0.0"); |
| 338 | Ip4Address serverIP = Ip4Address.valueOf("0.0.0.0"); |
| 339 | |
| 340 | if (dhcpPayload != null) { |
| 341 | |
| 342 | // TODO Convert this to enum value. |
| 343 | byte incomingPacketType = 0; |
| 344 | for (DHCPOption option : dhcpPayload.getOptions()) { |
| 345 | if (option.getCode() == DHCP.DHCPOptionCode.OptionCode_MessageType.getValue()) { |
| 346 | byte[] data = option.getData(); |
| 347 | incomingPacketType = data[0]; |
| 348 | } |
| 349 | if (option.getCode() == DHCP.DHCPOptionCode.OptionCode_RequestedIP.getValue()) { |
| 350 | byte[] data = option.getData(); |
| 351 | requestedIP = Ip4Address.valueOf(data); |
| 352 | flagIfRequestedIP = true; |
| 353 | } |
| 354 | if (option.getCode() == DHCP.DHCPOptionCode.OptionCode_DHCPServerIp.getValue()) { |
| 355 | byte[] data = option.getData(); |
| 356 | serverIP = Ip4Address.valueOf(data); |
| 357 | flagIfServerIP = true; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | String ipOffered = ""; |
| 362 | DHCP.DHCPMessageType outgoingPacketType; |
| 363 | MacAddress clientMAC = new MacAddress(dhcpPayload.getClientHardwareAddress()); |
| 364 | |
| 365 | if (incomingPacketType == DHCP.DHCPMessageType.MessageType_Discover.getValue()) { |
| 366 | |
| 367 | outgoingPacketType = DHCP.DHCPMessageType.MessageType_Offer; |
| 368 | ipOffered = dhcpStore.suggestIP(clientMAC).toString(); |
| 369 | |
| 370 | Ethernet ethReply = buildReply(packet, ipOffered, outgoingPacketType.getValue()); |
| 371 | sendReply(context, ethReply); |
| 372 | |
| 373 | } else if (incomingPacketType == DHCP.DHCPMessageType.MessageType_Request.getValue()) { |
| 374 | |
| 375 | outgoingPacketType = DHCP.DHCPMessageType.MessageType_ACK; |
| 376 | |
| 377 | if (flagIfServerIP && flagIfRequestedIP) { |
| 378 | // SELECTING state |
| 379 | if (MY_IP.equals(serverIP.toString()) && |
| 380 | dhcpStore.assignIP(clientMAC, requestedIP, leaseTime)) { |
| 381 | |
| 382 | Ethernet ethReply = buildReply(packet, requestedIP.toString(), |
| 383 | outgoingPacketType.getValue()); |
| 384 | sendReply(context, ethReply); |
| 385 | } |
| 386 | } else if (flagIfRequestedIP) { |
| 387 | // INIT-REBOOT state |
| 388 | if (dhcpStore.assignIP(clientMAC, requestedIP, leaseTime)) { |
| 389 | Ethernet ethReply = buildReply(packet, requestedIP.toString(), |
| 390 | outgoingPacketType.getValue()); |
| 391 | sendReply(context, ethReply); |
| 392 | } |
| 393 | } else { |
| 394 | // RENEWING and REBINDING state |
| 395 | int ciaadr = dhcpPayload.getClientIPAddress(); |
| 396 | if (ciaadr != 0) { |
| 397 | Ip4Address clientIaddr = Ip4Address.valueOf(ciaadr); |
| 398 | if (dhcpStore.assignIP(clientMAC, clientIaddr, leaseTime)) { |
| 399 | Ethernet ethReply = buildReply(packet, clientIaddr.toString(), |
| 400 | outgoingPacketType.getValue()); |
| 401 | sendReply(context, ethReply); |
| 402 | } |
| 403 | } |
| 404 | } |
| 405 | } else if (incomingPacketType == DHCP.DHCPMessageType.MessageType_Release.getValue()) { |
| 406 | |
| 407 | dhcpStore.releaseIP(clientMAC); |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | @Override |
| 413 | public void process(PacketContext context) { |
| 414 | |
| 415 | // Stop processing if the packet has been handled, since we |
| 416 | // can't do any more to it. |
| 417 | if (context.isHandled()) { |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | Ethernet packet = context.inPacket().parsed(); |
| 422 | if (packet == null) { |
| 423 | return; |
| 424 | } |
| 425 | |
| 426 | if (packet.getEtherType() == Ethernet.TYPE_IPV4) { |
| 427 | IPv4 ipv4Packet = (IPv4) packet.getPayload(); |
| 428 | |
| 429 | if (ipv4Packet.getProtocol() == IPv4.PROTOCOL_UDP) { |
| 430 | UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| 431 | |
| 432 | if (udpPacket.getDestinationPort() == UDP.DHCP_SERVER_PORT && |
| 433 | udpPacket.getSourcePort() == UDP.DHCP_CLIENT_PORT) { |
| 434 | // This is meant for the dhcp server so process the packet here. |
| 435 | |
| 436 | DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
| 437 | processDHCPPacket(context, dhcpPayload); |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | } |