| /* |
| * Copyright 2014-2015 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.net.proxyarp.impl; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onlab.packet.ARP; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.ICMP6; |
| import org.onlab.packet.IPv6; |
| import org.onlab.packet.Ip4Address; |
| import org.onlab.packet.Ip6Address; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.MacAddress; |
| import org.onlab.packet.VlanId; |
| import org.onlab.packet.ndp.NeighborAdvertisement; |
| import org.onlab.packet.ndp.NeighborDiscoveryOptions; |
| import org.onlab.packet.ndp.NeighborSolicitation; |
| import org.onosproject.incubator.net.intf.Interface; |
| import org.onosproject.incubator.net.intf.InterfaceService; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.Host; |
| import org.onosproject.net.device.DeviceService; |
| import org.onosproject.net.edge.EdgePortService; |
| import org.onosproject.net.flow.DefaultTrafficTreatment; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.host.HostService; |
| import org.onosproject.net.link.LinkService; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.InboundPacket; |
| import org.onosproject.net.packet.PacketContext; |
| import org.onosproject.net.packet.PacketService; |
| import org.onosproject.net.proxyarp.ProxyArpService; |
| import org.onosproject.net.proxyarp.ProxyArpStore; |
| import org.slf4j.Logger; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Set; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.onlab.packet.VlanId.vlanId; |
| import static org.onosproject.net.HostId.hostId; |
| import static org.onosproject.security.AppGuard.checkPermission; |
| import static org.slf4j.LoggerFactory.getLogger; |
| import static org.onosproject.security.AppPermission.Type.*; |
| |
| |
| @Component(immediate = true) |
| @Service |
| public class ProxyArpManager implements ProxyArpService { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private static final String MAC_ADDR_NULL = "Mac address cannot be null."; |
| private static final String REQUEST_NULL = "ARP or NDP request cannot be null."; |
| private static final String REQUEST_NOT_ARP = "Ethernet frame does not contain ARP request."; |
| private static final String NOT_ARP_REQUEST = "ARP is not a request."; |
| private static final String NOT_ARP_REPLY = "ARP is not a reply."; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected EdgePortService edgeService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected HostService hostService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected LinkService linkService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected DeviceService deviceService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected ProxyArpStore store; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected InterfaceService interfaceService; |
| |
| @Activate |
| public void activate() { |
| store.setDelegate(this::sendTo); |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| store.setDelegate(null); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public boolean isKnown(IpAddress addr) { |
| checkPermission(PACKET_READ); |
| |
| checkNotNull(addr, MAC_ADDR_NULL); |
| Set<Host> hosts = hostService.getHostsByIp(addr); |
| return !hosts.isEmpty(); |
| } |
| |
| @Override |
| public void reply(Ethernet eth, ConnectPoint inPort) { |
| checkPermission(PACKET_WRITE); |
| |
| checkNotNull(eth, REQUEST_NULL); |
| |
| if (eth.getEtherType() == Ethernet.TYPE_ARP) { |
| replyArp(eth, inPort); |
| } else if (eth.getEtherType() == Ethernet.TYPE_IPV6) { |
| replyNdp(eth, inPort); |
| } |
| } |
| |
| private void replyArp(Ethernet eth, ConnectPoint inPort) { |
| ARP arp = (ARP) eth.getPayload(); |
| checkArgument(arp.getOpCode() == ARP.OP_REQUEST, NOT_ARP_REQUEST); |
| checkNotNull(inPort); |
| Ip4Address targetAddress = Ip4Address.valueOf(arp.getTargetProtocolAddress()); |
| |
| VlanId vlan = vlanId(eth.getVlanID()); |
| |
| if (hasIpAddress(inPort)) { |
| // If the request came from outside the network, only reply if it was |
| // for one of our external addresses. |
| |
| interfaceService.getInterfacesByPort(inPort) |
| .stream() |
| .filter(intf -> intf.ipAddresses() |
| .stream() |
| .anyMatch(ia -> ia.ipAddress().equals(targetAddress))) |
| .forEach(intf -> buildAndSendArp(targetAddress, intf.mac(), eth, inPort)); |
| |
| // Stop here and don't proxy ARPs if the port has an IP address |
| return; |
| } |
| |
| // See if we have the target host in the host store |
| |
| Set<Host> hosts = hostService.getHostsByIp(targetAddress); |
| |
| Host dst = null; |
| Host src = hostService.getHost(hostId(eth.getSourceMAC(), |
| vlanId(eth.getVlanID()))); |
| |
| for (Host host : hosts) { |
| if (host.vlan().equals(vlan)) { |
| dst = host; |
| break; |
| } |
| } |
| |
| if (src != null && dst != null) { |
| // We know the target host so we can respond |
| buildAndSendArp(targetAddress, dst.mac(), eth, inPort); |
| return; |
| } |
| |
| // If the source address matches one of our external addresses |
| // it could be a request from an internal host to an external |
| // address. Forward it over to the correct port. |
| Ip4Address source = |
| Ip4Address.valueOf(arp.getSenderProtocolAddress()); |
| |
| boolean matched = false; |
| Set<Interface> interfaces = interfaceService.getInterfacesByIp(source); |
| for (Interface intf : interfaces) { |
| if (intf.vlan().equals(vlan)) { |
| matched = true; |
| sendTo(eth, intf.connectPoint()); |
| break; |
| } |
| } |
| |
| if (matched) { |
| return; |
| } |
| |
| // The request couldn't be resolved. |
| // Flood the request on all ports except the incoming port. |
| flood(eth, inPort); |
| } |
| |
| private void replyNdp(Ethernet eth, ConnectPoint inPort) { |
| IPv6 ipv6 = (IPv6) eth.getPayload(); |
| ICMP6 icmpv6 = (ICMP6) ipv6.getPayload(); |
| NeighborSolicitation nsol = (NeighborSolicitation) icmpv6.getPayload(); |
| Ip6Address targetAddress = Ip6Address.valueOf(nsol.getTargetAddress()); |
| |
| VlanId vlan = vlanId(eth.getVlanID()); |
| |
| // If the request came from outside the network, only reply if it was |
| // for one of our external addresses. |
| if (hasIpAddress(inPort)) { |
| interfaceService.getInterfacesByPort(inPort) |
| .stream() |
| .filter(intf -> intf.ipAddresses() |
| .stream() |
| .anyMatch(ia -> ia.ipAddress().equals(targetAddress))) |
| .forEach(intf -> buildAndSendNdp(targetAddress, intf.mac(), eth, inPort)); |
| return; |
| } |
| |
| // Continue with normal proxy ARP case |
| |
| Set<Host> hosts = hostService.getHostsByIp(targetAddress); |
| |
| Host dst = null; |
| Host src = hostService.getHost(hostId(eth.getSourceMAC(), |
| vlanId(eth.getVlanID()))); |
| |
| for (Host host : hosts) { |
| if (host.vlan().equals(vlan)) { |
| dst = host; |
| break; |
| } |
| } |
| |
| if (src != null && dst != null) { |
| // We know the target host so we can respond |
| buildAndSendNdp(targetAddress, dst.mac(), eth, inPort); |
| return; |
| } |
| |
| // If the source address matches one of our external addresses |
| // it could be a request from an internal host to an external |
| // address. Forward it over to the correct port. |
| Ip6Address source = |
| Ip6Address.valueOf(ipv6.getSourceAddress()); |
| |
| boolean matched = false; |
| |
| Set<Interface> interfaces = interfaceService.getInterfacesByIp(source); |
| for (Interface intf : interfaces) { |
| if (intf.vlan().equals(vlan)) { |
| matched = true; |
| sendTo(eth, intf.connectPoint()); |
| break; |
| } |
| } |
| |
| if (matched) { |
| return; |
| } |
| |
| // The request couldn't be resolved. |
| // Flood the request on all ports except the incoming ports. |
| flood(eth, inPort); |
| } |
| //TODO checkpoint |
| |
| private void buildAndSendArp(Ip4Address srcIp, MacAddress srcMac, |
| Ethernet request, ConnectPoint port) { |
| sendTo(ARP.buildArpReply(srcIp, srcMac, request), port); |
| } |
| |
| private void buildAndSendNdp(Ip6Address srcIp, MacAddress srcMac, |
| Ethernet request, ConnectPoint port) { |
| sendTo(buildNdpReply(srcIp, srcMac, request), port); |
| } |
| |
| /** |
| * Outputs the given packet out the given port. |
| * |
| * @param packet the packet to send |
| * @param outPort the port to send it out |
| */ |
| private void sendTo(Ethernet packet, ConnectPoint outPort) { |
| sendTo(outPort, ByteBuffer.wrap(packet.serialize())); |
| } |
| |
| private void sendTo(ConnectPoint outPort, ByteBuffer packet) { |
| if (!edgeService.isEdgePoint(outPort)) { |
| // Sanity check to make sure we don't send the packet out an |
| // internal port and create a loop (could happen due to |
| // misconfiguration). |
| return; |
| } |
| |
| TrafficTreatment.Builder builder = DefaultTrafficTreatment.builder(); |
| builder.setOutput(outPort.port()); |
| packetService.emit(new DefaultOutboundPacket(outPort.deviceId(), |
| builder.build(), packet)); |
| } |
| |
| /** |
| * Returns whether the given port has any IP addresses configured or not. |
| * |
| * @param port the port to check |
| * @return true if the port has at least one IP address configured, |
| * otherwise false |
| */ |
| private boolean hasIpAddress(ConnectPoint port) { |
| return interfaceService.getInterfacesByPort(port) |
| .stream() |
| .map(intf -> intf.ipAddresses()) |
| .findAny() |
| .isPresent(); |
| } |
| |
| @Override |
| public void forward(Ethernet eth, ConnectPoint inPort) { |
| checkPermission(PACKET_WRITE); |
| |
| checkNotNull(eth, REQUEST_NULL); |
| |
| Host h = hostService.getHost(hostId(eth.getDestinationMAC(), |
| vlanId(eth.getVlanID()))); |
| |
| if (h == null) { |
| flood(eth, inPort); |
| } else { |
| Host subject = hostService.getHost(hostId(eth.getSourceMAC(), |
| vlanId(eth.getVlanID()))); |
| store.forward(h.location(), subject, ByteBuffer.wrap(eth.serialize())); |
| } |
| } |
| |
| @Override |
| public boolean handlePacket(PacketContext context) { |
| checkPermission(PACKET_WRITE); |
| |
| InboundPacket pkt = context.inPacket(); |
| Ethernet ethPkt = pkt.parsed(); |
| |
| if (ethPkt == null) { |
| return false; |
| } |
| if (ethPkt.getEtherType() == Ethernet.TYPE_ARP) { |
| return handleArp(context, ethPkt); |
| } else if (ethPkt.getEtherType() == Ethernet.TYPE_IPV6) { |
| return handleNdp(context, ethPkt); |
| } |
| return false; |
| } |
| |
| private boolean handleArp(PacketContext context, Ethernet ethPkt) { |
| ARP arp = (ARP) ethPkt.getPayload(); |
| |
| if (arp.getOpCode() == ARP.OP_REPLY) { |
| forward(ethPkt, context.inPacket().receivedFrom()); |
| } else if (arp.getOpCode() == ARP.OP_REQUEST) { |
| reply(ethPkt, context.inPacket().receivedFrom()); |
| } else { |
| return false; |
| } |
| context.block(); |
| return true; |
| } |
| |
| private boolean handleNdp(PacketContext context, Ethernet ethPkt) { |
| IPv6 ipv6 = (IPv6) ethPkt.getPayload(); |
| |
| if (ipv6.getNextHeader() != IPv6.PROTOCOL_ICMP6) { |
| return false; |
| } |
| ICMP6 icmpv6 = (ICMP6) ipv6.getPayload(); |
| if (icmpv6.getIcmpType() == ICMP6.NEIGHBOR_ADVERTISEMENT) { |
| forward(ethPkt, context.inPacket().receivedFrom()); |
| } else if (icmpv6.getIcmpType() == ICMP6.NEIGHBOR_SOLICITATION) { |
| reply(ethPkt, context.inPacket().receivedFrom()); |
| } else { |
| return false; |
| } |
| context.block(); |
| return true; |
| } |
| |
| /** |
| * Flood the arp request at all edges in the network. |
| * |
| * @param request the arp request |
| * @param inPort the connect point the arp request was received on |
| */ |
| private void flood(Ethernet request, ConnectPoint inPort) { |
| TrafficTreatment.Builder builder = null; |
| ByteBuffer buf = ByteBuffer.wrap(request.serialize()); |
| |
| for (ConnectPoint connectPoint : edgeService.getEdgePoints()) { |
| if (hasIpAddress(connectPoint) || connectPoint.equals(inPort)) { |
| continue; |
| } |
| |
| builder = DefaultTrafficTreatment.builder(); |
| builder.setOutput(connectPoint.port()); |
| packetService.emit(new DefaultOutboundPacket(connectPoint.deviceId(), |
| builder.build(), buf)); |
| } |
| } |
| |
| /** |
| * Builds an Neighbor Discovery reply based on a request. |
| * |
| * @param srcIp the IP address to use as the reply source |
| * @param srcMac the MAC address to use as the reply source |
| * @param request the Neighbor Solicitation request we got |
| * @return an Ethernet frame containing the Neighbor Advertisement reply |
| */ |
| private Ethernet buildNdpReply(Ip6Address srcIp, MacAddress srcMac, |
| Ethernet request) { |
| Ethernet eth = new Ethernet(); |
| eth.setDestinationMACAddress(request.getSourceMAC()); |
| eth.setSourceMACAddress(srcMac); |
| eth.setEtherType(Ethernet.TYPE_IPV6); |
| eth.setVlanID(request.getVlanID()); |
| |
| IPv6 requestIp = (IPv6) request.getPayload(); |
| IPv6 ipv6 = new IPv6(); |
| ipv6.setSourceAddress(srcIp.toOctets()); |
| ipv6.setDestinationAddress(requestIp.getSourceAddress()); |
| ipv6.setHopLimit((byte) 255); |
| |
| ICMP6 icmp6 = new ICMP6(); |
| icmp6.setIcmpType(ICMP6.NEIGHBOR_ADVERTISEMENT); |
| icmp6.setIcmpCode((byte) 0); |
| |
| NeighborAdvertisement nadv = new NeighborAdvertisement(); |
| nadv.setTargetAddress(srcIp.toOctets()); |
| nadv.setSolicitedFlag((byte) 1); |
| nadv.setOverrideFlag((byte) 1); |
| nadv.addOption(NeighborDiscoveryOptions.TYPE_TARGET_LL_ADDRESS, |
| srcMac.toBytes()); |
| |
| icmp6.setPayload(nadv); |
| ipv6.setPayload(icmp6); |
| eth.setPayload(ipv6); |
| return eth; |
| } |
| } |