Jonathan Hart | 9a426f8 | 2015-09-03 15:43:13 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 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 | |
| 17 | package org.onosproject.sdnip; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableList; |
| 20 | import org.onlab.packet.Ethernet; |
| 21 | import org.onlab.packet.IpAddress; |
| 22 | import org.onlab.packet.IpPrefix; |
| 23 | import org.onlab.packet.MacAddress; |
| 24 | import org.onlab.packet.VlanId; |
| 25 | import org.onosproject.core.ApplicationId; |
| 26 | import org.onosproject.incubator.net.intf.Interface; |
| 27 | import org.onosproject.incubator.net.intf.InterfaceService; |
| 28 | import org.onosproject.net.ConnectPoint; |
| 29 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 30 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 31 | import org.onosproject.net.flow.TrafficSelector; |
| 32 | import org.onosproject.net.flow.TrafficTreatment; |
| 33 | import org.onosproject.net.intent.Constraint; |
| 34 | import org.onosproject.net.intent.Key; |
| 35 | import org.onosproject.net.intent.MultiPointToSinglePointIntent; |
| 36 | import org.onosproject.net.intent.constraint.PartialFailureConstraint; |
| 37 | import org.onosproject.routing.FibListener; |
| 38 | import org.onosproject.routing.FibUpdate; |
| 39 | import org.onosproject.routing.IntentSynchronizationService; |
| 40 | import org.slf4j.Logger; |
| 41 | import org.slf4j.LoggerFactory; |
| 42 | |
| 43 | import java.util.Collection; |
| 44 | import java.util.HashSet; |
| 45 | import java.util.Map; |
| 46 | import java.util.Set; |
| 47 | import java.util.concurrent.ConcurrentHashMap; |
| 48 | |
| 49 | import static com.google.common.base.Preconditions.checkArgument; |
| 50 | |
| 51 | /** |
| 52 | * FIB component of SDN-IP. |
| 53 | */ |
| 54 | public class SdnIpFib implements FibListener { |
| 55 | private Logger log = LoggerFactory.getLogger(getClass()); |
| 56 | |
| 57 | private static final int PRIORITY_OFFSET = 100; |
| 58 | private static final int PRIORITY_MULTIPLIER = 5; |
| 59 | protected static final ImmutableList<Constraint> CONSTRAINTS |
| 60 | = ImmutableList.of(new PartialFailureConstraint()); |
| 61 | |
| 62 | private final Map<IpPrefix, MultiPointToSinglePointIntent> routeIntents; |
| 63 | |
| 64 | private final ApplicationId appId; |
| 65 | private final InterfaceService interfaceService; |
| 66 | private final IntentSynchronizationService intentSynchronizer; |
| 67 | |
| 68 | /** |
| 69 | * Class constructor. |
| 70 | * |
| 71 | * @param appId application ID to use when generating intents |
| 72 | * @param interfaceService interface service |
| 73 | * @param intentSynchronizer intent synchronizer |
| 74 | */ |
| 75 | public SdnIpFib(ApplicationId appId, InterfaceService interfaceService, |
| 76 | IntentSynchronizationService intentSynchronizer) { |
| 77 | routeIntents = new ConcurrentHashMap<>(); |
| 78 | |
| 79 | this.appId = appId; |
| 80 | this.interfaceService = interfaceService; |
| 81 | this.intentSynchronizer = intentSynchronizer; |
| 82 | } |
| 83 | |
| 84 | |
| 85 | @Override |
| 86 | public void update(Collection<FibUpdate> updates, Collection<FibUpdate> withdraws) { |
| 87 | int submitCount = 0, withdrawCount = 0; |
| 88 | // |
| 89 | // NOTE: Semantically, we MUST withdraw existing intents before |
| 90 | // submitting new intents. |
| 91 | // |
| 92 | synchronized (this) { |
| 93 | MultiPointToSinglePointIntent intent; |
| 94 | |
| 95 | // |
| 96 | // Prepare the Intent batch operations for the intents to withdraw |
| 97 | // |
| 98 | for (FibUpdate withdraw : withdraws) { |
| 99 | checkArgument(withdraw.type() == FibUpdate.Type.DELETE, |
| 100 | "FibUpdate with wrong type in withdraws list"); |
| 101 | |
| 102 | IpPrefix prefix = withdraw.entry().prefix(); |
| 103 | intent = routeIntents.remove(prefix); |
| 104 | if (intent == null) { |
| 105 | log.trace("SDN-IP No intent in routeIntents to delete " + |
| 106 | "for prefix: {}", prefix); |
| 107 | continue; |
| 108 | } |
| 109 | intentSynchronizer.withdraw(intent); |
| 110 | withdrawCount++; |
| 111 | } |
| 112 | |
| 113 | // |
| 114 | // Prepare the Intent batch operations for the intents to submit |
| 115 | // |
| 116 | for (FibUpdate update : updates) { |
| 117 | checkArgument(update.type() == FibUpdate.Type.UPDATE, |
| 118 | "FibUpdate with wrong type in updates list"); |
| 119 | |
| 120 | IpPrefix prefix = update.entry().prefix(); |
| 121 | intent = generateRouteIntent(prefix, update.entry().nextHopIp(), |
| 122 | update.entry().nextHopMac()); |
| 123 | |
| 124 | if (intent == null) { |
| 125 | // This preserves the old semantics - if an intent can't be |
| 126 | // generated, we don't do anything with that prefix. But |
| 127 | // perhaps we should withdraw the old intent anyway? |
| 128 | continue; |
| 129 | } |
| 130 | |
| 131 | routeIntents.put(prefix, intent); |
| 132 | intentSynchronizer.submit(intent); |
| 133 | submitCount++; |
| 134 | } |
| 135 | |
| 136 | log.debug("SDN-IP submitted {}/{}, withdrew = {}/{}", submitCount, |
| 137 | updates.size(), withdrawCount, withdraws.size()); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Generates a route intent for a prefix, the next hop IP address, and |
| 143 | * the next hop MAC address. |
| 144 | * <p/> |
| 145 | * This method will find the egress interface for the intent. |
| 146 | * Intent will match dst IP prefix and rewrite dst MAC address at all other |
| 147 | * border switches, then forward packets according to dst MAC address. |
| 148 | * |
| 149 | * @param prefix IP prefix of the route to add |
| 150 | * @param nextHopIpAddress IP address of the next hop |
| 151 | * @param nextHopMacAddress MAC address of the next hop |
| 152 | * @return the generated intent, or null if no intent should be submitted |
| 153 | */ |
| 154 | private MultiPointToSinglePointIntent generateRouteIntent( |
| 155 | IpPrefix prefix, |
| 156 | IpAddress nextHopIpAddress, |
| 157 | MacAddress nextHopMacAddress) { |
| 158 | |
| 159 | // Find the attachment point (egress interface) of the next hop |
| 160 | Interface egressInterface = interfaceService.getMatchingInterface(nextHopIpAddress); |
| 161 | if (egressInterface == null) { |
| 162 | log.warn("No outgoing interface found for {}", |
| 163 | nextHopIpAddress); |
| 164 | return null; |
| 165 | } |
| 166 | |
| 167 | // Generate the intent itself |
| 168 | Set<ConnectPoint> ingressPorts = new HashSet<>(); |
| 169 | ConnectPoint egressPort = egressInterface.connectPoint(); |
| 170 | log.debug("Generating intent for prefix {}, next hop mac {}", |
| 171 | prefix, nextHopMacAddress); |
| 172 | |
| 173 | for (Interface intf : interfaceService.getInterfaces()) { |
| 174 | // TODO this should be only peering interfaces |
| 175 | if (!intf.connectPoint().equals(egressInterface.connectPoint())) { |
| 176 | ConnectPoint srcPort = intf.connectPoint(); |
| 177 | ingressPorts.add(srcPort); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | // Match the destination IP prefix at the first hop |
| 182 | TrafficSelector.Builder selector = DefaultTrafficSelector.builder(); |
| 183 | if (prefix.isIp4()) { |
| 184 | selector.matchEthType(Ethernet.TYPE_IPV4); |
| 185 | selector.matchIPDst(prefix); |
| 186 | } else { |
| 187 | selector.matchEthType(Ethernet.TYPE_IPV6); |
| 188 | selector.matchIPv6Dst(prefix); |
| 189 | } |
| 190 | |
| 191 | // Rewrite the destination MAC address |
| 192 | TrafficTreatment.Builder treatment = DefaultTrafficTreatment.builder() |
| 193 | .setEthDst(nextHopMacAddress); |
| 194 | if (!egressInterface.vlan().equals(VlanId.NONE)) { |
| 195 | treatment.setVlanId(egressInterface.vlan()); |
| 196 | // If we set VLAN ID, we have to make sure a VLAN tag exists. |
| 197 | // TODO support no VLAN -> VLAN routing |
| 198 | selector.matchVlanId(VlanId.ANY); |
| 199 | } |
| 200 | |
| 201 | int priority = |
| 202 | prefix.prefixLength() * PRIORITY_MULTIPLIER + PRIORITY_OFFSET; |
| 203 | Key key = Key.of(prefix.toString(), appId); |
| 204 | return MultiPointToSinglePointIntent.builder() |
| 205 | .appId(appId) |
| 206 | .key(key) |
| 207 | .selector(selector.build()) |
| 208 | .treatment(treatment.build()) |
| 209 | .ingressPoints(ingressPorts) |
| 210 | .egressPoint(egressPort) |
| 211 | .priority(priority) |
| 212 | .constraints(CONSTRAINTS) |
| 213 | .build(); |
| 214 | } |
| 215 | |
| 216 | } |