Hyunsun Moon | 022272f | 2016-01-11 15:30:42 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014-2015 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.cordvtn; |
| 17 | |
| 18 | import com.google.common.collect.Sets; |
| 19 | import org.onlab.packet.ARP; |
| 20 | import org.onlab.packet.EthType; |
| 21 | import org.onlab.packet.Ethernet; |
| 22 | import org.onlab.packet.Ip4Address; |
| 23 | import org.onlab.packet.IpAddress; |
| 24 | import org.onlab.packet.MacAddress; |
| 25 | import org.onosproject.core.ApplicationId; |
| 26 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 27 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 28 | import org.onosproject.net.flow.TrafficSelector; |
| 29 | import org.onosproject.net.flow.TrafficTreatment; |
| 30 | import org.onosproject.net.packet.DefaultOutboundPacket; |
| 31 | import org.onosproject.net.packet.PacketContext; |
| 32 | import org.onosproject.net.packet.PacketPriority; |
| 33 | import org.onosproject.net.packet.PacketService; |
| 34 | import org.slf4j.Logger; |
| 35 | |
| 36 | import java.nio.ByteBuffer; |
| 37 | import java.util.Optional; |
| 38 | import java.util.Set; |
| 39 | |
| 40 | import static com.google.common.base.Preconditions.checkNotNull; |
| 41 | import static org.slf4j.LoggerFactory.getLogger; |
| 42 | |
| 43 | /** |
| 44 | * Handles ARP requests for virtual network service IPs. |
| 45 | */ |
| 46 | public class CordVtnArpProxy { |
| 47 | protected final Logger log = getLogger(getClass()); |
| 48 | // TODO make gateway MAC address configurable |
| 49 | private static final MacAddress DEFAULT_GATEWAY_MAC = MacAddress.valueOf("00:00:00:00:00:01"); |
| 50 | |
| 51 | private final ApplicationId appId; |
| 52 | private final PacketService packetService; |
| 53 | |
| 54 | private Set<Ip4Address> serviceIPs = Sets.newHashSet(); |
| 55 | |
| 56 | /** |
| 57 | * Default constructor. |
| 58 | * |
| 59 | * @param appId application id |
| 60 | * @param packetService packet service |
| 61 | */ |
| 62 | public CordVtnArpProxy(ApplicationId appId, PacketService packetService) { |
| 63 | this.appId = appId; |
| 64 | this.packetService = packetService; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Requests ARP packet. |
| 69 | */ |
| 70 | public void requestPacket() { |
| 71 | TrafficSelector selector = DefaultTrafficSelector.builder() |
| 72 | .matchEthType(EthType.EtherType.ARP.ethType().toShort()) |
| 73 | .build(); |
| 74 | |
| 75 | packetService.requestPackets(selector, |
| 76 | PacketPriority.CONTROL, |
| 77 | appId, |
| 78 | Optional.empty()); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Cancels ARP packet. |
| 83 | */ |
| 84 | public void cancelPacket() { |
| 85 | TrafficSelector selector = DefaultTrafficSelector.builder() |
| 86 | .matchEthType(EthType.EtherType.ARP.ethType().toShort()) |
| 87 | .build(); |
| 88 | |
| 89 | packetService.cancelPackets(selector, |
| 90 | PacketPriority.CONTROL, |
| 91 | appId, |
| 92 | Optional.empty()); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Adds a given service IP address to be served. |
| 97 | * |
| 98 | * @param serviceIp service ip |
| 99 | */ |
| 100 | public void addServiceIp(IpAddress serviceIp) { |
| 101 | checkNotNull(serviceIp); |
| 102 | serviceIPs.add(serviceIp.getIp4Address()); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Removes a given service IP address from this ARP proxy. |
| 107 | * |
| 108 | * @param serviceIp service ip |
| 109 | */ |
| 110 | public void removeServiceIp(IpAddress serviceIp) { |
| 111 | checkNotNull(serviceIp); |
| 112 | serviceIPs.remove(serviceIp.getIp4Address()); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Emits ARP reply with fake MAC address for a given ARP request. |
| 117 | * It only handles requests for the registered service IPs, and the other |
| 118 | * requests can be handled by other ARP handlers like openstackSwitching or |
| 119 | * proxyArp, for example. |
| 120 | * |
| 121 | * @param context packet context |
| 122 | * @param ethPacket ethernet packet |
| 123 | */ |
| 124 | public void processArpPacket(PacketContext context, Ethernet ethPacket) { |
| 125 | ARP arpPacket = (ARP) ethPacket.getPayload(); |
| 126 | Ip4Address targetIp = Ip4Address.valueOf(arpPacket.getTargetProtocolAddress()); |
| 127 | |
| 128 | if (arpPacket.getOpCode() != ARP.OP_REQUEST) { |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | if (!serviceIPs.contains(targetIp)) { |
| 133 | return; |
| 134 | } |
| 135 | |
| 136 | Ethernet ethReply = ARP.buildArpReply( |
| 137 | targetIp, |
| 138 | DEFAULT_GATEWAY_MAC, |
| 139 | ethPacket); |
| 140 | |
| 141 | TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| 142 | .setOutput(context.inPacket().receivedFrom().port()) |
| 143 | .build(); |
| 144 | |
| 145 | packetService.emit(new DefaultOutboundPacket( |
| 146 | context.inPacket().receivedFrom().deviceId(), |
| 147 | treatment, |
| 148 | ByteBuffer.wrap(ethReply.serialize()))); |
| 149 | |
| 150 | context.block(); |
| 151 | } |
| 152 | } |