alshabib | eff0054 | 2015-09-23 13:22:33 -0700 | [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 | package org.onosproject.mfwd.impl; |
| 17 | |
| 18 | import static org.slf4j.LoggerFactory.getLogger; |
| 19 | |
| 20 | import org.apache.felix.scr.annotations.Activate; |
| 21 | import org.apache.felix.scr.annotations.Component; |
| 22 | import org.apache.felix.scr.annotations.Deactivate; |
| 23 | import org.apache.felix.scr.annotations.Reference; |
| 24 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 25 | |
| 26 | import org.onlab.packet.Ethernet; |
| 27 | import org.onlab.packet.IpPrefix; |
| 28 | import org.onlab.packet.IpAddress; |
| 29 | import org.onlab.packet.Ip4Address; |
| 30 | import org.onlab.packet.IPv4; |
| 31 | import org.onosproject.core.ApplicationId; |
| 32 | import org.onosproject.core.CoreService; |
| 33 | import org.onosproject.net.ConnectPoint; |
| 34 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 35 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 36 | import org.onosproject.net.flow.TrafficSelector; |
| 37 | import org.onosproject.net.flow.TrafficTreatment; |
| 38 | import org.onosproject.net.packet.DefaultOutboundPacket; |
| 39 | import org.onosproject.net.packet.InboundPacket; |
| 40 | import org.onosproject.net.packet.OutboundPacket; |
| 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 | |
| 47 | /** |
| 48 | * WORK-IN-PROGRESS: The multicast forwarding application using intent framework. |
| 49 | */ |
| 50 | @Component(immediate = true) |
| 51 | public class McastForwarding { |
| 52 | |
| 53 | private final Logger log = getLogger(getClass()); |
| 54 | private final IpPrefix mcast = IpPrefix.valueOf("224.0.0.0/4"); |
| 55 | |
| 56 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 57 | protected PacketService packetService; |
| 58 | |
| 59 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 60 | protected CoreService coreService; |
| 61 | |
| 62 | private ReactivePacketProcessor processor = new ReactivePacketProcessor(); |
| 63 | private McastRouteTable mrib; |
| 64 | private static ApplicationId appId; |
| 65 | |
| 66 | /** |
| 67 | * Active MulticastForwardingIntent. |
| 68 | */ |
| 69 | @Activate |
| 70 | public void activate() { |
| 71 | appId = coreService.registerApplication("org.onosproject.mfwd"); |
| 72 | |
| 73 | packetService.addProcessor(processor, PacketProcessor.director(2)); |
| 74 | |
| 75 | // Build a traffic selector for all multicast traffic |
| 76 | TrafficSelector.Builder selector = DefaultTrafficSelector.builder(); |
| 77 | selector.matchEthType(Ethernet.TYPE_IPV4); |
| 78 | selector.matchIPDst(mcast); |
| 79 | packetService.requestPackets(selector.build(), PacketPriority.REACTIVE, appId); |
| 80 | |
| 81 | mrib = McastRouteTable.getInstance(); |
| 82 | log.info("Started"); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Deactivate Multicast Forwarding Intent. |
| 87 | */ |
| 88 | @Deactivate |
| 89 | public void deactivate() { |
| 90 | packetService.removeProcessor(processor); |
| 91 | processor = null; |
| 92 | log.info("Stopped"); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Get the application ID, used by the McastIntentManager. |
| 97 | * |
| 98 | * @return the application ID |
| 99 | */ |
| 100 | public static ApplicationId getAppId() { |
| 101 | return appId; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Packet processor responsible for forwarding packets along their paths. |
| 106 | */ |
| 107 | private class ReactivePacketProcessor implements PacketProcessor { |
| 108 | |
| 109 | /** |
| 110 | * Process incoming packets. |
| 111 | * |
| 112 | * @param context packet processing context |
| 113 | */ |
| 114 | @Override |
| 115 | public void process(PacketContext context) { |
| 116 | // Stop processing if the packet has been handled, since we |
| 117 | // can't do any more to it. |
| 118 | if (context.isHandled()) { |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | InboundPacket pkt = context.inPacket(); |
| 123 | Ethernet ethPkt = pkt.parsed(); |
| 124 | |
| 125 | if (ethPkt == null) { |
| 126 | return; |
| 127 | } |
| 128 | |
| 129 | if (ethPkt.getEtherType() != Ethernet.TYPE_IPV4 && |
| 130 | ethPkt.getEtherType() != Ethernet.TYPE_IPV6) { |
| 131 | return; |
| 132 | } |
| 133 | |
| 134 | if (ethPkt.getEtherType() == Ethernet.TYPE_IPV6) { |
| 135 | // Ignore ipv6 at the moment. |
| 136 | return; |
| 137 | } |
| 138 | |
| 139 | IPv4 ip = (IPv4) ethPkt.getPayload(); |
| 140 | IpAddress gaddr = IpAddress.valueOf(ip.getDestinationAddress()); |
| 141 | IpAddress saddr = Ip4Address.valueOf(ip.getSourceAddress()); |
| 142 | |
| 143 | log.debug("Packet ({}, {}) has been punted\n" + |
| 144 | "\tingress port: {}\n", |
| 145 | saddr.toString(), |
| 146 | gaddr.toString(), |
| 147 | context.inPacket().receivedFrom().toString()); |
| 148 | |
| 149 | if (!mcast.contains(gaddr)) { |
| 150 | // Yikes, this is a bad group address |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | if (mcast.contains(saddr)) { |
| 155 | // Yikes, the source address is multicast |
| 156 | return; |
| 157 | } |
| 158 | |
| 159 | IpPrefix spfx = IpPrefix.valueOf(saddr, 32); |
| 160 | IpPrefix gpfx = IpPrefix.valueOf(gaddr, 32); |
| 161 | |
| 162 | /* |
| 163 | * Do a best match lookup on the (s, g) of the packet. If an entry does |
| 164 | * not exist create one and store it's incoming connect point. |
| 165 | * |
| 166 | * The connect point is deviceId / portId that the packet entered |
| 167 | * the SDN network. This differs from traditional mcast where the |
| 168 | * ingress port would be a specific device. |
| 169 | */ |
| 170 | McastRoute entry = mrib.findBestMatch(spfx, gpfx); |
Satish K | 8f3deb7 | 2015-11-21 13:35:17 +0530 | [diff] [blame] | 171 | if (entry == null || entry.getSaddr().address().isZero()) { |
alshabib | eff0054 | 2015-09-23 13:22:33 -0700 | [diff] [blame] | 172 | |
| 173 | /* |
| 174 | * Create an entry that we can fast drop. |
| 175 | */ |
| 176 | entry = mrib.addRoute(spfx, gpfx); |
| 177 | entry.addIngressPoint(context.inPacket().receivedFrom()); |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * TODO: If we do not have an ingress or any egress connect points we |
| 182 | * should set up a fast drop entry. |
| 183 | */ |
| 184 | if (entry.getIngressPoint() == null) { |
| 185 | return; |
| 186 | } |
| 187 | |
| 188 | if (entry.getEgressPoints().isEmpty()) { |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * This is odd, we should not have received a punted packet if an |
| 194 | * intent was installed unless the intent was not installed |
| 195 | * correctly. However, we are seeing packets get punted after |
| 196 | * the intent has been installed. |
| 197 | * |
| 198 | * Therefore we are going to forward the packets even if they |
| 199 | * should have already been forwarded by the intent fabric. |
| 200 | */ |
| 201 | if (entry.getIntentKey() != null) { |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | entry.setIntent(); |
| 206 | McastIntentManager im = McastIntentManager.getInstance(); |
| 207 | im.setIntent(entry); |
| 208 | |
| 209 | entry.incrementPuntCount(); |
| 210 | |
| 211 | // Send the pack out each of the egress devices & port |
| 212 | forwardPacketToDst(context, entry); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Forward the packet to it's multicast destinations. |
| 218 | * |
| 219 | * @param context The packet context |
| 220 | * @param entry The multicast route entry matching this packet |
| 221 | */ |
| 222 | private void forwardPacketToDst(PacketContext context, McastRoute entry) { |
| 223 | |
| 224 | // Send the pack out each of the respective egress ports |
Rusty Eddy | ddef893 | 2015-09-25 01:15:53 +0000 | [diff] [blame] | 225 | for (ConnectPoint egress : entry.getEgressConnectPoints()) { |
alshabib | eff0054 | 2015-09-23 13:22:33 -0700 | [diff] [blame] | 226 | TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| 227 | .setOutput(egress.port()).build(); |
| 228 | |
| 229 | OutboundPacket packet = new DefaultOutboundPacket( |
| 230 | egress.deviceId(), |
| 231 | treatment, |
| 232 | context.inPacket().unparsed()); |
| 233 | |
| 234 | packetService.emit(packet); |
| 235 | } |
| 236 | } |
| 237 | } |