gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-present 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.dhcprelay; |
| 17 | |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 18 | import java.nio.ByteBuffer; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 19 | import java.util.Objects; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 20 | import java.util.Set; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 21 | import org.apache.felix.scr.annotations.Activate; |
| 22 | import org.apache.felix.scr.annotations.Component; |
| 23 | import org.apache.felix.scr.annotations.Deactivate; |
| 24 | import org.apache.felix.scr.annotations.Reference; |
| 25 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 26 | import org.onlab.packet.ARP; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 27 | import org.onlab.packet.DHCP; |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 28 | import org.onlab.packet.DHCPOption; |
| 29 | import org.onlab.packet.DHCPPacketType; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 30 | import org.onlab.packet.Ethernet; |
| 31 | import org.onlab.packet.IPv4; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 32 | import org.onlab.packet.Ip4Address; |
| 33 | import org.onlab.packet.MacAddress; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 34 | import org.onlab.packet.TpPort; |
| 35 | import org.onlab.packet.UDP; |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 36 | import org.onlab.packet.VlanId; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 37 | import org.onosproject.core.ApplicationId; |
| 38 | import org.onosproject.core.CoreService; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 39 | import org.onosproject.incubator.net.intf.Interface; |
| 40 | import org.onosproject.incubator.net.intf.InterfaceService; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 41 | import org.onosproject.net.ConnectPoint; |
| 42 | import org.onosproject.net.Host; |
| 43 | import org.onosproject.net.HostId; |
| 44 | import org.onosproject.net.config.ConfigFactory; |
| 45 | import org.onosproject.net.config.NetworkConfigEvent; |
| 46 | import org.onosproject.net.config.NetworkConfigListener; |
| 47 | import org.onosproject.net.config.NetworkConfigRegistry; |
| 48 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 49 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 50 | import org.onosproject.net.flow.TrafficSelector; |
| 51 | import org.onosproject.net.flow.TrafficTreatment; |
| 52 | import org.onosproject.net.host.HostService; |
| 53 | import org.onosproject.net.packet.DefaultOutboundPacket; |
| 54 | import org.onosproject.net.packet.OutboundPacket; |
| 55 | import org.onosproject.net.packet.PacketContext; |
| 56 | import org.onosproject.net.packet.PacketPriority; |
| 57 | import org.onosproject.net.packet.PacketProcessor; |
| 58 | import org.onosproject.net.packet.PacketService; |
| 59 | import org.slf4j.Logger; |
| 60 | import org.slf4j.LoggerFactory; |
| 61 | |
| 62 | import com.google.common.collect.ImmutableSet; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 63 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 64 | import static org.onosproject.net.config.basics.SubjectFactories.APP_SUBJECT_FACTORY; |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 65 | import static org.onlab.packet.DHCP.DHCPOptionCode.OptionCode_MessageType; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 66 | import static org.onlab.packet.MacAddress.valueOf; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 67 | /** |
| 68 | * DHCP Relay Agent Application Component. |
| 69 | */ |
| 70 | @Component(immediate = true) |
| 71 | public class DhcpRelay { |
| 72 | |
| 73 | public static final String DHCP_RELAY_APP = "org.onosproject.dhcp-relay"; |
| 74 | private final Logger log = LoggerFactory.getLogger(getClass()); |
| 75 | private final InternalConfigListener cfgListener = new InternalConfigListener(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 76 | private static Ip4Address relayAgentIP = null; |
| 77 | private static MacAddress relayAgentMAC = null; |
| 78 | private static MacAddress myMAC = valueOf("4f:4f:4f:4f:4f:4f"); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 79 | |
| 80 | private final Set<ConfigFactory> factories = ImmutableSet.of( |
| 81 | new ConfigFactory<ApplicationId, DhcpRelayConfig>(APP_SUBJECT_FACTORY, |
| 82 | DhcpRelayConfig.class, |
| 83 | "dhcprelay") { |
| 84 | @Override |
| 85 | public DhcpRelayConfig createConfig() { |
| 86 | return new DhcpRelayConfig(); |
| 87 | } |
| 88 | } |
| 89 | ); |
| 90 | |
| 91 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 92 | protected NetworkConfigRegistry cfgService; |
| 93 | |
| 94 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 95 | protected CoreService coreService; |
| 96 | |
| 97 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 98 | protected PacketService packetService; |
| 99 | |
| 100 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 101 | protected HostService hostService; |
| 102 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 103 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 104 | protected InterfaceService interfaceService; |
| 105 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 106 | private DhcpRelayPacketProcessor dhcpRelayPacketProcessor = new DhcpRelayPacketProcessor(); |
| 107 | private ConnectPoint dhcpServerConnectPoint = null; |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 108 | private Ip4Address dhcpServerIp = null; |
| 109 | private MacAddress dhcpServerMac = null; |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 110 | private ApplicationId appId; |
| 111 | |
| 112 | @Activate |
| 113 | protected void activate() { |
| 114 | //start the dhcp relay agent |
| 115 | |
| 116 | appId = coreService.registerApplication(DHCP_RELAY_APP); |
| 117 | |
| 118 | cfgService.addListener(cfgListener); |
| 119 | factories.forEach(cfgService::registerConfigFactory); |
| 120 | //update the dhcp server configuration. |
| 121 | updateConfig(); |
| 122 | //add the packet services. |
| 123 | packetService.addProcessor(dhcpRelayPacketProcessor, PacketProcessor.director(0)); |
| 124 | requestPackets(); |
| 125 | log.info("DHCP-RELAY Started"); |
| 126 | log.info("started the apps dhcp relay"); |
| 127 | } |
| 128 | |
| 129 | @Deactivate |
| 130 | protected void deactivate() { |
| 131 | cfgService.removeListener(cfgListener); |
| 132 | factories.forEach(cfgService::unregisterConfigFactory); |
| 133 | packetService.removeProcessor(dhcpRelayPacketProcessor); |
| 134 | cancelPackets(); |
| 135 | log.info("DHCP-RELAY Stopped"); |
| 136 | } |
| 137 | |
| 138 | private void updateConfig() { |
| 139 | DhcpRelayConfig cfg = cfgService.getConfig(appId, DhcpRelayConfig.class); |
| 140 | |
| 141 | if (cfg == null) { |
| 142 | log.warn("Dhcp Server info not available"); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | dhcpServerConnectPoint = cfg.getDhcpServerConnectPoint(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 147 | dhcpServerIp = cfg.getDhcpServerIp(); |
| 148 | dhcpServerMac = cfg.getDhcpServermac(); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 149 | log.info("dhcp server connect points are " + dhcpServerConnectPoint); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 150 | log.info("dhcp server ipaddress " + dhcpServerIp); |
| 151 | log.info("dhcp server mac address " + dhcpServerMac); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Request packet in via PacketService. |
| 156 | */ |
| 157 | private void requestPackets() { |
| 158 | |
| 159 | TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| 160 | .matchEthType(Ethernet.TYPE_IPV4) |
| 161 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 162 | .matchUdpSrc(TpPort.tpPort(UDP.DHCP_SERVER_PORT)); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 163 | packetService.requestPackets(selectorServer.build(), PacketPriority.CONTROL, appId); |
| 164 | |
| 165 | TrafficSelector.Builder selectorClient = DefaultTrafficSelector.builder() |
| 166 | .matchEthType(Ethernet.TYPE_IPV4) |
| 167 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 168 | .matchUdpSrc(TpPort.tpPort(UDP.DHCP_CLIENT_PORT)); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 169 | packetService.requestPackets(selectorClient.build(), PacketPriority.CONTROL, appId); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 170 | |
| 171 | TrafficSelector.Builder selectorArpServer = DefaultTrafficSelector.builder() |
| 172 | .matchEthType(Ethernet.TYPE_ARP); |
| 173 | packetService.requestPackets(selectorArpServer.build(), PacketPriority.CONTROL, appId); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Cancel requested packets in via packet service. |
| 178 | */ |
| 179 | private void cancelPackets() { |
| 180 | TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| 181 | .matchEthType(Ethernet.TYPE_IPV4) |
| 182 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 183 | .matchUdpSrc(TpPort.tpPort(UDP.DHCP_SERVER_PORT)); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 184 | packetService.cancelPackets(selectorServer.build(), PacketPriority.CONTROL, appId); |
| 185 | |
| 186 | TrafficSelector.Builder selectorClient = DefaultTrafficSelector.builder() |
| 187 | .matchEthType(Ethernet.TYPE_IPV4) |
| 188 | .matchIPProtocol(IPv4.PROTOCOL_UDP) |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 189 | .matchUdpSrc(TpPort.tpPort(UDP.DHCP_CLIENT_PORT)); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 190 | packetService.cancelPackets(selectorClient.build(), PacketPriority.CONTROL, appId); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 191 | |
| 192 | TrafficSelector.Builder selectorArpServer = DefaultTrafficSelector.builder() |
| 193 | .matchEthType(Ethernet.TYPE_ARP); |
| 194 | packetService.cancelPackets(selectorArpServer.build(), PacketPriority.CONTROL, appId); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | private class DhcpRelayPacketProcessor implements PacketProcessor { |
| 198 | |
| 199 | @Override |
| 200 | public void process(PacketContext context) { |
| 201 | // process the packet and get the payload |
| 202 | Ethernet packet = context.inPacket().parsed(); |
| 203 | |
| 204 | if (packet == null) { |
| 205 | return; |
| 206 | } |
| 207 | |
| 208 | if (packet.getEtherType() == Ethernet.TYPE_IPV4) { |
| 209 | IPv4 ipv4Packet = (IPv4) packet.getPayload(); |
| 210 | |
| 211 | if (ipv4Packet.getProtocol() == IPv4.PROTOCOL_UDP) { |
| 212 | UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| 213 | DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 214 | if (udpPacket.getSourcePort() == UDP.DHCP_CLIENT_PORT || |
| 215 | udpPacket.getSourcePort() == UDP.DHCP_SERVER_PORT) { |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 216 | //This packet is dhcp. |
| 217 | processDhcpPacket(context, dhcpPayload); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 218 | } |
| 219 | } |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 220 | } else if (packet.getEtherType() == Ethernet.TYPE_ARP) { |
| 221 | ARP arpPacket = (ARP) packet.getPayload(); |
| 222 | Set<Interface> serverInterfaces = interfaceService. |
| 223 | getInterfacesByPort(context.inPacket().receivedFrom()); |
| 224 | //ignore the packets if dhcp server interface is not configured on onos. |
| 225 | if (serverInterfaces.isEmpty()) { |
| 226 | log.warn("server virtual interface not configured"); |
| 227 | return; |
| 228 | } |
| 229 | if ((arpPacket.getOpCode() == ARP.OP_REQUEST) && |
| 230 | checkArpRequestFrmDhcpServ(serverInterfaces, arpPacket)) { |
| 231 | processArpPacket(context, packet); |
| 232 | } |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 236 | //method to check the arp request is from dhcp server for default-gateway. |
| 237 | private boolean checkArpRequestFrmDhcpServ(Set<Interface> serverInterfaces, ARP arpPacket) { |
| 238 | if (Objects.equals(serverInterfaces.iterator().next().ipAddressesList().get(0). |
| 239 | ipAddress().getIp4Address(), |
| 240 | Ip4Address.valueOf(arpPacket.getTargetProtocolAddress()))) { |
| 241 | return true; |
| 242 | } |
| 243 | return false; |
| 244 | } |
| 245 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 246 | //forward the packet to ConnectPoint where the DHCP server is attached. |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 247 | private void forwardPacket(Ethernet packet) { |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 248 | |
| 249 | //send Packetout to dhcp server connectpoint. |
| 250 | if (dhcpServerConnectPoint != null) { |
| 251 | TrafficTreatment t = DefaultTrafficTreatment.builder() |
| 252 | .setOutput(dhcpServerConnectPoint.port()).build(); |
| 253 | OutboundPacket o = new DefaultOutboundPacket( |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 254 | dhcpServerConnectPoint.deviceId(), t, ByteBuffer.wrap(packet.serialize())); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 255 | packetService.emit(o); |
| 256 | } |
| 257 | } |
| 258 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 259 | /** |
| 260 | * Processes the ARP Payload and initiates a reply to the client. |
| 261 | * |
| 262 | * @param context context of the incoming message |
| 263 | * @param packet the ethernet payload |
| 264 | */ |
| 265 | private void processArpPacket(PacketContext context, Ethernet packet) { |
| 266 | |
| 267 | ARP arpPacket = (ARP) packet.getPayload(); |
| 268 | |
| 269 | ARP arpReply = (ARP) arpPacket.clone(); |
| 270 | arpReply.setOpCode(ARP.OP_REPLY); |
| 271 | |
| 272 | arpReply.setTargetProtocolAddress(arpPacket.getSenderProtocolAddress()); |
| 273 | arpReply.setTargetHardwareAddress(arpPacket.getSenderHardwareAddress()); |
| 274 | arpReply.setSenderProtocolAddress(arpPacket.getTargetProtocolAddress()); |
| 275 | arpReply.setSenderHardwareAddress(myMAC.toBytes()); |
| 276 | |
| 277 | // Ethernet Frame. |
| 278 | Ethernet ethReply = new Ethernet(); |
| 279 | ethReply.setSourceMACAddress(myMAC); |
| 280 | ethReply.setDestinationMACAddress(packet.getSourceMAC()); |
| 281 | ethReply.setEtherType(Ethernet.TYPE_ARP); |
| 282 | ethReply.setVlanID(packet.getVlanID()); |
| 283 | |
| 284 | ethReply.setPayload(arpReply); |
| 285 | forwardPacket(ethReply); |
| 286 | } |
| 287 | |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 288 | //process the dhcp packet before sending to server |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 289 | private void processDhcpPacket(PacketContext context, DHCP dhcpPayload) { |
Charles Chan | 1b20123 | 2016-12-07 15:39:22 -0800 | [diff] [blame^] | 290 | ConnectPoint inPort = context.inPacket().receivedFrom(); |
| 291 | Set<Interface> clientServerInterfaces = interfaceService.getInterfacesByPort(inPort); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 292 | //ignore the packets if dhcp client interface is not configured on onos. |
| 293 | if (clientServerInterfaces.isEmpty()) { |
Charles Chan | 1b20123 | 2016-12-07 15:39:22 -0800 | [diff] [blame^] | 294 | log.warn("Virtual interface is not configured on {}", inPort); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 295 | return; |
| 296 | } |
| 297 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 298 | if (dhcpPayload == null) { |
| 299 | return; |
| 300 | } |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 301 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 302 | Ethernet packet = context.inPacket().parsed(); |
| 303 | DHCPPacketType incomingPacketType = null; |
| 304 | for (DHCPOption option : dhcpPayload.getOptions()) { |
| 305 | if (option.getCode() == OptionCode_MessageType.getValue()) { |
| 306 | byte[] data = option.getData(); |
| 307 | incomingPacketType = DHCPPacketType.getType(data[0]); |
| 308 | } |
| 309 | } |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 310 | |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 311 | switch (incomingPacketType) { |
| 312 | case DHCPDISCOVER: |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 313 | //add the gatewayip as virtual interface ip for server to understand the lease to be assigned |
| 314 | //and forward the packet to dhcp server. |
| 315 | Ethernet ethernetPacketDiscover = processDhcpPacketFrmClient(context, packet, clientServerInterfaces); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 316 | forwardPacket(ethernetPacketDiscover); |
| 317 | break; |
| 318 | case DHCPOFFER: |
| 319 | //reply to dhcp client. |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 320 | Ethernet ethernetPacketOffer = processDhcpPacketFrmServer(packet); |
| 321 | sendReply(ethernetPacketOffer, dhcpPayload); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 322 | break; |
| 323 | case DHCPREQUEST: |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 324 | //add the gatewayip as virtual interface ip for server to understand the lease to be assigned |
| 325 | //and forward the packet to dhcp server. |
| 326 | Ethernet ethernetPacketRequest = processDhcpPacketFrmClient(context, packet, clientServerInterfaces); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 327 | forwardPacket(ethernetPacketRequest); |
| 328 | break; |
| 329 | case DHCPACK: |
| 330 | //reply to dhcp client. |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 331 | Ethernet ethernetPacketAck = processDhcpPacketFrmServer(packet); |
| 332 | sendReply(ethernetPacketAck, dhcpPayload); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 333 | break; |
| 334 | default: |
| 335 | break; |
| 336 | } |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 337 | } |
| 338 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 339 | //build the DHCP discover/request packet with gatewayip(unicast packet) |
| 340 | private Ethernet processDhcpPacketFrmClient(PacketContext context, Ethernet ethernetPacket, |
| 341 | Set<Interface> clientInterfaces) { |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 342 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 343 | //assuming one interface per port for now. |
| 344 | relayAgentIP = clientInterfaces.iterator().next().ipAddressesList().get(0). |
| 345 | ipAddress().getIp4Address(); |
| 346 | relayAgentMAC = clientInterfaces.iterator().next().mac(); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 347 | // get dhcp header. |
| 348 | Ethernet etherReply = (Ethernet) ethernetPacket.clone(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 349 | etherReply.setSourceMACAddress(relayAgentMAC); |
| 350 | etherReply.setDestinationMACAddress(dhcpServerMac); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 351 | IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 352 | ipv4Packet.setSourceAddress(relayAgentIP.toInt()); |
| 353 | ipv4Packet.setDestinationAddress(dhcpServerIp.toInt()); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 354 | UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| 355 | DHCP dhcpPacket = (DHCP) udpPacket.getPayload(); |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 356 | dhcpPacket.setGatewayIPAddress(relayAgentIP.toInt()); |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 357 | udpPacket.setPayload(dhcpPacket); |
| 358 | ipv4Packet.setPayload(udpPacket); |
| 359 | etherReply.setPayload(ipv4Packet); |
| 360 | return etherReply; |
| 361 | } |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 362 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 363 | //build the DHCP offer/ack with proper client port. |
| 364 | private Ethernet processDhcpPacketFrmServer(Ethernet ethernetPacket) { |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 365 | |
gaurav | 38351de | 2016-07-27 04:44:33 +0530 | [diff] [blame] | 366 | // get dhcp header. |
| 367 | Ethernet etherReply = (Ethernet) ethernetPacket.clone(); |
| 368 | IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
| 369 | UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| 370 | DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
| 371 | //set the ethernet frame. |
| 372 | etherReply.setDestinationMACAddress(dhcpPayload.getClientHardwareAddress()); |
| 373 | udpPacket.setDestinationPort(UDP.DHCP_CLIENT_PORT); |
| 374 | udpPacket.setPayload(dhcpPayload); |
| 375 | ipv4Packet.setPayload(udpPacket); |
| 376 | etherReply.setPayload(ipv4Packet); |
| 377 | return etherReply; |
| 378 | } |
| 379 | |
| 380 | //send the response to the requestor host. |
| 381 | private void sendReply(Ethernet ethPacket, DHCP dhcpPayload) { |
| 382 | |
| 383 | MacAddress descMac = new MacAddress(dhcpPayload.getClientHardwareAddress()); |
| 384 | Host host = hostService.getHost(HostId.hostId(descMac, |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 385 | VlanId.vlanId(ethPacket.getVlanID()))); |
Lei Xu | 3aeaf72 | 2016-08-11 13:51:12 -0700 | [diff] [blame] | 386 | //handle the concurrent host offline scenario |
| 387 | if (host == null) { |
| 388 | return; |
| 389 | } |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 390 | ConnectPoint dhcpRequestor = new ConnectPoint(host.location().elementId(), |
| 391 | host.location().port()); |
| 392 | |
| 393 | //send Packetout to requestor host. |
| 394 | if (dhcpRequestor != null) { |
| 395 | TrafficTreatment t = DefaultTrafficTreatment.builder() |
| 396 | .setOutput(dhcpRequestor.port()).build(); |
| 397 | OutboundPacket o = new DefaultOutboundPacket( |
gaurav | 4af95fb | 2016-07-07 01:48:44 +0530 | [diff] [blame] | 398 | dhcpRequestor.deviceId(), t, ByteBuffer.wrap(ethPacket.serialize())); |
gaurav | f088456 | 2016-06-17 02:47:13 +0530 | [diff] [blame] | 399 | packetService.emit(o); |
| 400 | } |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * Listener for network config events. |
| 406 | */ |
| 407 | private class InternalConfigListener implements NetworkConfigListener { |
| 408 | |
| 409 | @Override |
| 410 | public void event(NetworkConfigEvent event) { |
| 411 | |
| 412 | if ((event.type() == NetworkConfigEvent.Type.CONFIG_ADDED || |
| 413 | event.type() == NetworkConfigEvent.Type.CONFIG_UPDATED) && |
| 414 | event.configClass().equals(DhcpRelayConfig.class)) { |
| 415 | updateConfig(); |
| 416 | log.info("Reconfigured"); |
| 417 | } |
| 418 | } |
| 419 | } |
Lei Xu | 3aeaf72 | 2016-08-11 13:51:12 -0700 | [diff] [blame] | 420 | } |