| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * 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.dhcprelay; |
| |
| import com.google.common.collect.Sets; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Property; |
| 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.BasePacket; |
| import org.onlab.packet.DHCP; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IPv4; |
| import org.onlab.packet.Ip4Address; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.MacAddress; |
| import org.onlab.packet.UDP; |
| import org.onlab.packet.VlanId; |
| import org.onlab.packet.dhcp.CircuitId; |
| import org.onlab.packet.dhcp.DhcpOption; |
| import org.onlab.packet.dhcp.DhcpRelayAgentOption; |
| import org.onosproject.dhcprelay.api.DhcpHandler; |
| import org.onosproject.dhcprelay.store.DhcpRecord; |
| import org.onosproject.dhcprelay.store.DhcpRelayStore; |
| import org.onosproject.incubator.net.intf.Interface; |
| import org.onosproject.incubator.net.intf.InterfaceService; |
| import org.onosproject.incubator.net.routing.Route; |
| import org.onosproject.incubator.net.routing.RouteStore; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.Host; |
| import org.onosproject.net.HostId; |
| import org.onosproject.net.HostLocation; |
| import org.onosproject.net.flow.DefaultTrafficTreatment; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.host.DefaultHostDescription; |
| import org.onosproject.net.host.HostDescription; |
| import org.onosproject.net.host.HostService; |
| import org.onosproject.net.host.HostStore; |
| import org.onosproject.net.host.InterfaceIpAddress; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.OutboundPacket; |
| import org.onosproject.net.packet.PacketContext; |
| import org.onosproject.net.packet.PacketService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| import static org.onlab.packet.DHCP.DHCPOptionCode.OptionCode_CircuitID; |
| import static org.onlab.packet.DHCP.DHCPOptionCode.OptionCode_END; |
| import static org.onlab.packet.DHCP.DHCPOptionCode.OptionCode_MessageType; |
| import static org.onlab.packet.MacAddress.valueOf; |
| import static org.onlab.packet.dhcp.DhcpRelayAgentOption.RelayAgentInfoOptions.CIRCUIT_ID; |
| |
| @Component |
| @Service |
| @Property(name = "version", value = "4") |
| public class Dhcp4HandlerImpl implements DhcpHandler { |
| private static Logger log = LoggerFactory.getLogger(Dhcp4HandlerImpl.class); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected DhcpRelayStore dhcpRelayStore; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected HostStore hostStore; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected RouteStore routeStore; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected InterfaceService interfaceService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected HostService hostService; |
| |
| private Ip4Address dhcpServerIp = null; |
| // dhcp server may be connected directly to the SDN network or |
| // via an external gateway. When connected directly, the dhcpConnectPoint, dhcpConnectMac, |
| // and dhcpConnectVlan refer to the server. When connected via the gateway, they refer |
| // to the gateway. |
| private ConnectPoint dhcpServerConnectPoint = null; |
| private MacAddress dhcpConnectMac = null; |
| private VlanId dhcpConnectVlan = null; |
| private Ip4Address dhcpGatewayIp = null; |
| |
| @Override |
| public void setDhcpServerIp(IpAddress dhcpServerIp) { |
| checkNotNull(dhcpServerIp, "DHCP server IP can't be null"); |
| checkState(dhcpServerIp.isIp4(), "Invalid server IP for DHCPv4 relay handler"); |
| this.dhcpServerIp = dhcpServerIp.getIp4Address(); |
| } |
| |
| @Override |
| public void setDhcpServerConnectPoint(ConnectPoint dhcpServerConnectPoint) { |
| checkNotNull(dhcpServerConnectPoint, "Server connect point can't null"); |
| this.dhcpServerConnectPoint = dhcpServerConnectPoint; |
| } |
| |
| @Override |
| public void setDhcpConnectMac(MacAddress dhcpConnectMac) { |
| this.dhcpConnectMac = dhcpConnectMac; |
| } |
| |
| @Override |
| public void setDhcpConnectVlan(VlanId dhcpConnectVlan) { |
| this.dhcpConnectVlan = dhcpConnectVlan; |
| } |
| |
| @Override |
| public void setDhcpGatewayIp(IpAddress dhcpGatewayIp) { |
| if (dhcpGatewayIp != null) { |
| checkState(dhcpGatewayIp.isIp4(), "Invalid gateway IP for DHCPv4 relay handler"); |
| this.dhcpGatewayIp = dhcpGatewayIp.getIp4Address(); |
| } else { |
| // removes gateway config |
| this.dhcpGatewayIp = null; |
| } |
| } |
| |
| @Override |
| public Optional<IpAddress> getDhcpServerIp() { |
| return Optional.ofNullable(dhcpServerIp); |
| } |
| |
| @Override |
| public Optional<IpAddress> getDhcpGatewayIp() { |
| return Optional.ofNullable(dhcpGatewayIp); |
| } |
| |
| @Override |
| public Optional<MacAddress> getDhcpConnectMac() { |
| return Optional.ofNullable(dhcpConnectMac); |
| } |
| |
| @Override |
| public void processDhcpPacket(PacketContext context, BasePacket payload) { |
| checkNotNull(payload, "DHCP payload can't be null"); |
| checkState(payload instanceof DHCP, "Payload is not a DHCP"); |
| DHCP dhcpPayload = (DHCP) payload; |
| if (!configured()) { |
| log.warn("Missing DHCP relay server config. Abort packet processing"); |
| return; |
| } |
| |
| ConnectPoint inPort = context.inPacket().receivedFrom(); |
| Set<Interface> clientServerInterfaces = interfaceService.getInterfacesByPort(inPort); |
| // ignore the packets if dhcp client interface is not configured on onos. |
| if (clientServerInterfaces.isEmpty()) { |
| log.warn("Virtual interface is not configured on {}", inPort); |
| return; |
| } |
| checkNotNull(dhcpPayload, "Can't find DHCP payload"); |
| Ethernet packet = context.inPacket().parsed(); |
| DHCP.MsgType incomingPacketType = dhcpPayload.getOptions().stream() |
| .filter(dhcpOption -> dhcpOption.getCode() == OptionCode_MessageType.getValue()) |
| .map(DhcpOption::getData) |
| .map(data -> DHCP.MsgType.getType(data[0])) |
| .findFirst() |
| .orElse(null); |
| checkNotNull(incomingPacketType, "Can't get message type from DHCP payload {}", dhcpPayload); |
| switch (incomingPacketType) { |
| case DHCPDISCOVER: |
| // add the gatewayip as virtual interface ip for server to understand |
| // the lease to be assigned and forward the packet to dhcp server. |
| Ethernet ethernetPacketDiscover = |
| processDhcpPacketFromClient(context, packet, clientServerInterfaces); |
| |
| if (ethernetPacketDiscover != null) { |
| writeRequestDhcpRecord(inPort, packet, dhcpPayload); |
| handleDhcpDiscoverAndRequest(ethernetPacketDiscover); |
| } |
| break; |
| case DHCPOFFER: |
| //reply to dhcp client. |
| Ethernet ethernetPacketOffer = processDhcpPacketFromServer(packet); |
| if (ethernetPacketOffer != null) { |
| writeResponseDhcpRecord(ethernetPacketOffer, dhcpPayload); |
| handleDhcpOffer(ethernetPacketOffer, dhcpPayload); |
| } |
| break; |
| case DHCPREQUEST: |
| // add the gateway ip as virtual interface ip for server to understand |
| // the lease to be assigned and forward the packet to dhcp server. |
| Ethernet ethernetPacketRequest = |
| processDhcpPacketFromClient(context, packet, clientServerInterfaces); |
| if (ethernetPacketRequest != null) { |
| writeRequestDhcpRecord(inPort, packet, dhcpPayload); |
| handleDhcpDiscoverAndRequest(ethernetPacketRequest); |
| } |
| break; |
| case DHCPACK: |
| // reply to dhcp client. |
| Ethernet ethernetPacketAck = processDhcpPacketFromServer(packet); |
| if (ethernetPacketAck != null) { |
| writeResponseDhcpRecord(ethernetPacketAck, dhcpPayload); |
| handleDhcpAck(ethernetPacketAck, dhcpPayload); |
| } |
| break; |
| case DHCPRELEASE: |
| // TODO: release the ip address from client |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /** |
| * Checks if this app has been configured. |
| * |
| * @return true if all information we need have been initialized |
| */ |
| public boolean configured() { |
| return dhcpServerConnectPoint != null && dhcpServerIp != null; |
| } |
| |
| /** |
| * Returns the first interface ip out of a set of interfaces or null. |
| * |
| * @param intfs interfaces of one connect port |
| * @return the first interface IP; null if not exists an IP address in |
| * these interfaces |
| */ |
| private Ip4Address getRelayAgentIPv4Address(Set<Interface> intfs) { |
| return intfs.stream() |
| .map(Interface::ipAddressesList) |
| .flatMap(List::stream) |
| .map(InterfaceIpAddress::ipAddress) |
| .filter(IpAddress::isIp4) |
| .map(IpAddress::getIp4Address) |
| .findFirst() |
| .orElse(null); |
| } |
| |
| /** |
| * Build the DHCP discover/request packet with gateway IP(unicast packet). |
| * |
| * @param context the packet context |
| * @param ethernetPacket the ethernet payload to process |
| * @param clientInterfaces interfaces which belongs to input port |
| * @return processed packet |
| */ |
| private Ethernet processDhcpPacketFromClient(PacketContext context, |
| Ethernet ethernetPacket, |
| Set<Interface> clientInterfaces) { |
| Ip4Address relayAgentIp = getRelayAgentIPv4Address(clientInterfaces); |
| MacAddress relayAgentMac = clientInterfaces.iterator().next().mac(); |
| if (relayAgentIp == null || relayAgentMac == null) { |
| log.warn("Missing DHCP relay agent interface Ipv4 addr config for " |
| + "packet from client on port: {}. Aborting packet processing", |
| clientInterfaces.iterator().next().connectPoint()); |
| return null; |
| } |
| if (dhcpConnectMac == null) { |
| log.warn("DHCP {} not yet resolved .. Aborting DHCP " |
| + "packet processing from client on port: {}", |
| (dhcpGatewayIp == null) ? "server IP " + dhcpServerIp |
| : "gateway IP " + dhcpGatewayIp, |
| clientInterfaces.iterator().next().connectPoint()); |
| return null; |
| } |
| // get dhcp header. |
| Ethernet etherReply = (Ethernet) ethernetPacket.clone(); |
| etherReply.setSourceMACAddress(relayAgentMac); |
| etherReply.setDestinationMACAddress(dhcpConnectMac); |
| etherReply.setVlanID(dhcpConnectVlan.toShort()); |
| IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
| ipv4Packet.setSourceAddress(relayAgentIp.toInt()); |
| ipv4Packet.setDestinationAddress(dhcpServerIp.toInt()); |
| UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| DHCP dhcpPacket = (DHCP) udpPacket.getPayload(); |
| |
| // If there is no relay agent option(option 82), add one to DHCP payload |
| boolean containsRelayAgentOption = dhcpPacket.getOptions().stream() |
| .map(DhcpOption::getCode) |
| .anyMatch(code -> code == OptionCode_CircuitID.getValue()); |
| |
| if (!containsRelayAgentOption) { |
| ConnectPoint inPort = context.inPacket().receivedFrom(); |
| VlanId vlanId = VlanId.vlanId(ethernetPacket.getVlanID()); |
| // add connected in port and vlan |
| CircuitId cid = new CircuitId(inPort.toString(), vlanId); |
| byte[] circuitId = cid.serialize(); |
| DhcpOption circuitIdSubOpt = new DhcpOption(); |
| circuitIdSubOpt |
| .setCode(CIRCUIT_ID.getValue()) |
| .setLength((byte) circuitId.length) |
| .setData(circuitId); |
| |
| DhcpRelayAgentOption newRelayAgentOpt = new DhcpRelayAgentOption(); |
| newRelayAgentOpt.setCode(OptionCode_CircuitID.getValue()); |
| newRelayAgentOpt.addSubOption(circuitIdSubOpt); |
| |
| // Removes END option first |
| List<DhcpOption> options = dhcpPacket.getOptions().stream() |
| .filter(opt -> opt.getCode() != OptionCode_END.getValue()) |
| .collect(Collectors.toList()); |
| |
| // push relay agent option |
| options.add(newRelayAgentOpt); |
| |
| // make sure option 255(End) is the last option |
| DhcpOption endOption = new DhcpOption(); |
| endOption.setCode(OptionCode_END.getValue()); |
| options.add(endOption); |
| |
| dhcpPacket.setOptions(options); |
| dhcpPacket.setGatewayIPAddress(relayAgentIp.toInt()); |
| } |
| |
| udpPacket.setPayload(dhcpPacket); |
| udpPacket.setSourcePort(UDP.DHCP_CLIENT_PORT); |
| udpPacket.setDestinationPort(UDP.DHCP_SERVER_PORT); |
| ipv4Packet.setPayload(udpPacket); |
| etherReply.setPayload(ipv4Packet); |
| return etherReply; |
| } |
| |
| /** |
| * Writes DHCP record to the store according to the request DHCP packet (Discover, Request). |
| * |
| * @param location the location which DHCP packet comes from |
| * @param ethernet the DHCP packet |
| * @param dhcpPayload the DHCP payload |
| */ |
| private void writeRequestDhcpRecord(ConnectPoint location, |
| Ethernet ethernet, |
| DHCP dhcpPayload) { |
| VlanId vlanId = VlanId.vlanId(ethernet.getVlanID()); |
| MacAddress macAddress = MacAddress.valueOf(dhcpPayload.getClientHardwareAddress()); |
| HostId hostId = HostId.hostId(macAddress, vlanId); |
| DhcpRecord record = dhcpRelayStore.getDhcpRecord(hostId).orElse(null); |
| if (record == null) { |
| record = new DhcpRecord(HostId.hostId(macAddress, vlanId)); |
| } else { |
| record = record.clone(); |
| } |
| record.addLocation(new HostLocation(location, System.currentTimeMillis())); |
| record.ip4Status(dhcpPayload.getPacketType()); |
| record.setDirectlyConnected(directlyConnected(dhcpPayload)); |
| if (!directlyConnected(dhcpPayload)) { |
| // Update gateway mac address if the host is not directly connected |
| record.nextHop(ethernet.getSourceMAC()); |
| } |
| record.updateLastSeen(); |
| dhcpRelayStore.updateDhcpRecord(HostId.hostId(macAddress, vlanId), record); |
| } |
| |
| /** |
| * Writes DHCP record to the store according to the response DHCP packet (Offer, Ack). |
| * |
| * @param ethernet the DHCP packet |
| * @param dhcpPayload the DHCP payload |
| */ |
| private void writeResponseDhcpRecord(Ethernet ethernet, |
| DHCP dhcpPayload) { |
| Optional<Interface> outInterface = getOutputInterface(ethernet, dhcpPayload); |
| if (!outInterface.isPresent()) { |
| log.warn("Failed to determine where to send {}", dhcpPayload.getPacketType()); |
| return; |
| } |
| |
| Interface outIface = outInterface.get(); |
| ConnectPoint location = outIface.connectPoint(); |
| VlanId vlanId = outIface.vlan(); |
| MacAddress macAddress = MacAddress.valueOf(dhcpPayload.getClientHardwareAddress()); |
| HostId hostId = HostId.hostId(macAddress, vlanId); |
| DhcpRecord record = dhcpRelayStore.getDhcpRecord(hostId).orElse(null); |
| if (record == null) { |
| record = new DhcpRecord(HostId.hostId(macAddress, vlanId)); |
| } else { |
| record = record.clone(); |
| } |
| record.addLocation(new HostLocation(location, System.currentTimeMillis())); |
| if (dhcpPayload.getPacketType() == DHCP.MsgType.DHCPACK) { |
| record.ip4Address(Ip4Address.valueOf(dhcpPayload.getYourIPAddress())); |
| } |
| record.ip4Status(dhcpPayload.getPacketType()); |
| record.setDirectlyConnected(directlyConnected(dhcpPayload)); |
| record.updateLastSeen(); |
| dhcpRelayStore.updateDhcpRecord(HostId.hostId(macAddress, vlanId), record); |
| } |
| |
| /** |
| * Build the DHCP offer/ack with proper client port. |
| * |
| * @param ethernetPacket the original packet comes from server |
| * @return new packet which will send to the client |
| */ |
| private Ethernet processDhcpPacketFromServer(Ethernet ethernetPacket) { |
| // get dhcp header. |
| Ethernet etherReply = (Ethernet) ethernetPacket.clone(); |
| IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
| UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
| |
| // determine the vlanId of the client host - note that this vlan id |
| // could be different from the vlan in the packet from the server |
| Interface outInterface = getOutputInterface(ethernetPacket, dhcpPayload).orElse(null); |
| |
| if (outInterface == null) { |
| log.warn("Cannot find the interface for the DHCP {}", dhcpPayload); |
| return null; |
| } |
| |
| etherReply.setDestinationMACAddress(dhcpPayload.getClientHardwareAddress()); |
| etherReply.setVlanID(outInterface.vlan().toShort()); |
| // we leave the srcMac from the original packet |
| |
| // figure out the relay agent IP corresponding to the original request |
| Ip4Address relayAgentIP = getRelayAgentIPv4Address( |
| interfaceService.getInterfacesByPort(outInterface.connectPoint())); |
| if (relayAgentIP == null) { |
| log.warn("Cannot determine relay agent interface Ipv4 addr for host {}/{}. " |
| + "Aborting relay for dhcp packet from server {}", |
| etherReply.getDestinationMAC(), outInterface.vlan(), |
| ethernetPacket); |
| return null; |
| } |
| // SRC_IP: relay agent IP |
| // DST_IP: offered IP |
| ipv4Packet.setSourceAddress(relayAgentIP.toInt()); |
| ipv4Packet.setDestinationAddress(dhcpPayload.getYourIPAddress()); |
| udpPacket.setSourcePort(UDP.DHCP_SERVER_PORT); |
| if (directlyConnected(dhcpPayload)) { |
| udpPacket.setDestinationPort(UDP.DHCP_CLIENT_PORT); |
| } else { |
| // forward to another dhcp relay |
| udpPacket.setDestinationPort(UDP.DHCP_SERVER_PORT); |
| } |
| |
| udpPacket.setPayload(dhcpPayload); |
| ipv4Packet.setPayload(udpPacket); |
| etherReply.setPayload(ipv4Packet); |
| return etherReply; |
| } |
| |
| |
| /** |
| * Check if the host is directly connected to the network or not. |
| * |
| * @param dhcpPayload the dhcp payload |
| * @return true if the host is directly connected to the network; false otherwise |
| */ |
| private boolean directlyConnected(DHCP dhcpPayload) { |
| DhcpOption relayAgentOption = dhcpPayload.getOption(OptionCode_CircuitID); |
| |
| // Doesn't contains relay option |
| if (relayAgentOption == null) { |
| return true; |
| } |
| |
| IpAddress gatewayIp = IpAddress.valueOf(dhcpPayload.getGatewayIPAddress()); |
| Set<Interface> gatewayInterfaces = interfaceService.getInterfacesByIp(gatewayIp); |
| |
| // Contains relay option, and added by ONOS |
| if (!gatewayInterfaces.isEmpty()) { |
| return true; |
| } |
| |
| // Relay option added by other relay agent |
| return false; |
| } |
| |
| |
| /** |
| * Send the DHCP ack to the requester host. |
| * Modify Host or Route store according to the type of DHCP. |
| * |
| * @param ethernetPacketAck the packet |
| * @param dhcpPayload the DHCP data |
| */ |
| private void handleDhcpAck(Ethernet ethernetPacketAck, DHCP dhcpPayload) { |
| Optional<Interface> outInterface = getOutputInterface(ethernetPacketAck, dhcpPayload); |
| if (!outInterface.isPresent()) { |
| log.warn("Can't find output interface for dhcp: {}", dhcpPayload); |
| return; |
| } |
| |
| Interface outIface = outInterface.get(); |
| HostLocation hostLocation = new HostLocation(outIface.connectPoint(), System.currentTimeMillis()); |
| MacAddress macAddress = MacAddress.valueOf(dhcpPayload.getClientHardwareAddress()); |
| VlanId vlanId = outIface.vlan(); |
| HostId hostId = HostId.hostId(macAddress, vlanId); |
| Ip4Address ip = Ip4Address.valueOf(dhcpPayload.getYourIPAddress()); |
| |
| if (directlyConnected(dhcpPayload)) { |
| // Add to host store if it connect to network directly |
| Set<IpAddress> ips = Sets.newHashSet(ip); |
| HostDescription desc = new DefaultHostDescription(macAddress, vlanId, |
| hostLocation, ips); |
| |
| // Replace the ip when dhcp server give the host new ip address |
| hostStore.createOrUpdateHost(DhcpRelayManager.PROVIDER_ID, hostId, desc, false); |
| } else { |
| // Add to route store if it does not connect to network directly |
| // Get gateway host IP according to host mac address |
| DhcpRecord record = dhcpRelayStore.getDhcpRecord(hostId).orElse(null); |
| |
| if (record == null) { |
| log.warn("Can't find DHCP record of host {}", hostId); |
| return; |
| } |
| |
| MacAddress gwMac = record.nextHop().orElse(null); |
| if (gwMac == null) { |
| log.warn("Can't find gateway mac address from record {}", record); |
| return; |
| } |
| |
| HostId gwHostId = HostId.hostId(gwMac, record.vlanId()); |
| Host gwHost = hostService.getHost(gwHostId); |
| |
| if (gwHost == null) { |
| log.warn("Can't find gateway host {}", gwHostId); |
| return; |
| } |
| |
| Ip4Address nextHopIp = gwHost.ipAddresses() |
| .stream() |
| .filter(IpAddress::isIp4) |
| .map(IpAddress::getIp4Address) |
| .findFirst() |
| .orElse(null); |
| |
| if (nextHopIp == null) { |
| log.warn("Can't find IP address of gateway {}", gwHost); |
| return; |
| } |
| |
| Route route = new Route(Route.Source.STATIC, ip.toIpPrefix(), nextHopIp); |
| routeStore.updateRoute(route); |
| } |
| sendResponseToClient(ethernetPacketAck, dhcpPayload); |
| } |
| |
| /** |
| * forward the packet to ConnectPoint where the DHCP server is attached. |
| * |
| * @param packet the packet |
| */ |
| private void handleDhcpDiscoverAndRequest(Ethernet packet) { |
| // send packet to dhcp server connect point. |
| if (dhcpServerConnectPoint != null) { |
| TrafficTreatment t = DefaultTrafficTreatment.builder() |
| .setOutput(dhcpServerConnectPoint.port()).build(); |
| OutboundPacket o = new DefaultOutboundPacket( |
| dhcpServerConnectPoint.deviceId(), t, ByteBuffer.wrap(packet.serialize())); |
| if (log.isTraceEnabled()) { |
| log.trace("Relaying packet to dhcp server {}", packet); |
| } |
| packetService.emit(o); |
| } else { |
| log.warn("Can't find DHCP server connect point, abort."); |
| } |
| } |
| |
| |
| /** |
| * Gets output interface of a dhcp packet. |
| * If option 82 exists in the dhcp packet and the option was sent by |
| * ONOS (gateway address exists in ONOS interfaces), use the connect |
| * point and vlan id from circuit id; otherwise, find host by destination |
| * address and use vlan id from sender (dhcp server). |
| * |
| * @param ethPacket the ethernet packet |
| * @param dhcpPayload the dhcp packet |
| * @return an interface represent the output port and vlan; empty value |
| * if the host or circuit id not found |
| */ |
| private Optional<Interface> getOutputInterface(Ethernet ethPacket, DHCP dhcpPayload) { |
| VlanId originalPacketVlanId = VlanId.vlanId(ethPacket.getVlanID()); |
| IpAddress gatewayIpAddress = Ip4Address.valueOf(dhcpPayload.getGatewayIPAddress()); |
| Set<Interface> gatewayInterfaces = interfaceService.getInterfacesByIp(gatewayIpAddress); |
| DhcpRelayAgentOption option = (DhcpRelayAgentOption) dhcpPayload.getOption(OptionCode_CircuitID); |
| |
| // Sent by ONOS, and contains circuit id |
| if (!gatewayInterfaces.isEmpty() && option != null) { |
| DhcpOption circuitIdSubOption = option.getSubOption(CIRCUIT_ID.getValue()); |
| try { |
| CircuitId circuitId = CircuitId.deserialize(circuitIdSubOption.getData()); |
| ConnectPoint connectPoint = ConnectPoint.deviceConnectPoint(circuitId.connectPoint()); |
| VlanId vlanId = circuitId.vlanId(); |
| return Optional.of(new Interface(null, connectPoint, null, null, vlanId)); |
| } catch (IllegalArgumentException ex) { |
| // invalid circuit format, didn't sent by ONOS |
| log.debug("Invalid circuit {}, use information from dhcp payload", |
| circuitIdSubOption.getData()); |
| } |
| } |
| |
| // Use Vlan Id from DHCP server if DHCP relay circuit id was not |
| // sent by ONOS or circuit Id can't be parsed |
| MacAddress dstMac = valueOf(dhcpPayload.getClientHardwareAddress()); |
| Optional<DhcpRecord> dhcpRecord = dhcpRelayStore.getDhcpRecord(HostId.hostId(dstMac, originalPacketVlanId)); |
| return dhcpRecord |
| .map(DhcpRecord::locations) |
| .orElse(Collections.emptySet()) |
| .stream() |
| .reduce((hl1, hl2) -> { |
| if (hl1 == null || hl2 == null) { |
| return hl1 == null ? hl2 : hl1; |
| } |
| return hl1.time() > hl2.time() ? hl1 : hl2; |
| }) |
| .map(lastLocation -> new Interface(null, lastLocation, null, null, originalPacketVlanId)); |
| } |
| |
| /** |
| * Handles DHCP offer packet. |
| * |
| * @param ethPacket the packet |
| * @param dhcpPayload the DHCP data |
| */ |
| private void handleDhcpOffer(Ethernet ethPacket, DHCP dhcpPayload) { |
| // TODO: removes option 82 if necessary |
| sendResponseToClient(ethPacket, dhcpPayload); |
| } |
| |
| /** |
| * Send the response DHCP to the requester host. |
| * |
| * @param ethPacket the packet |
| * @param dhcpPayload the DHCP data |
| */ |
| private void sendResponseToClient(Ethernet ethPacket, DHCP dhcpPayload) { |
| Optional<Interface> outInterface = getOutputInterface(ethPacket, dhcpPayload); |
| outInterface.ifPresent(theInterface -> { |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| .setOutput(theInterface.connectPoint().port()) |
| .build(); |
| OutboundPacket o = new DefaultOutboundPacket( |
| theInterface.connectPoint().deviceId(), |
| treatment, |
| ByteBuffer.wrap(ethPacket.serialize())); |
| if (log.isTraceEnabled()) { |
| log.trace("Relaying packet to DHCP client {} via {}, vlan {}", |
| ethPacket, |
| theInterface.connectPoint(), |
| theInterface.vlan()); |
| } |
| packetService.emit(o); |
| }); |
| } |
| } |