diff options
Diffstat (limited to 'framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java')
| -rw-r--r-- | framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java | 132 |
1 files changed, 96 insertions, 36 deletions
diff --git a/framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java b/framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java index 96c85ba8..2c6412cf 100644 --- a/framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java +++ b/framework/src/onos/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/ArpHandler.java @@ -20,10 +20,10 @@ import org.onlab.packet.Ethernet; import org.onlab.packet.Ip4Address; import org.onlab.packet.IpAddress; import org.onlab.packet.MacAddress; +import org.onlab.packet.VlanId; import org.onosproject.net.ConnectPoint; import org.onosproject.net.DeviceId; import org.onosproject.net.Host; -import org.onosproject.net.Port; import org.onosproject.net.PortNumber; import org.onosproject.net.flow.DefaultTrafficTreatment; import org.onosproject.net.flow.TrafficTreatment; @@ -60,12 +60,21 @@ public class ArpHandler { /** * Processes incoming ARP packets. + * * If it is an ARP request to router itself or known hosts, * then it sends ARP response. * If it is an ARP request to unknown hosts in its own subnet, * then it flood the ARP request to the ports. * If it is an ARP response, then set a flow rule for the host * and forward any IP packets to the host in the packet buffer to the host. + * <p> + * Note: We handles all ARP packet in, even for those ARP packets between + * hosts in the same subnet. + * For an ARP packet with broadcast destination MAC, + * some switches pipelines will send it to the controller due to table miss, + * other swithches will flood the packets directly in the data plane without + * packet in. + * We can deal with both cases. * * @param pkt incoming packet */ @@ -86,29 +95,56 @@ public class ArpHandler { if (arp.getOpCode() == ARP.OP_REQUEST) { handleArpRequest(deviceId, connectPoint, ethernet); } else { - srManager.ipHandler.forwardPackets(deviceId, hostIpAddress); + handleArpReply(deviceId, connectPoint, ethernet); } } private void handleArpRequest(DeviceId deviceId, ConnectPoint inPort, Ethernet payload) { ARP arpRequest = (ARP) payload.getPayload(); + VlanId vlanId = VlanId.vlanId(payload.getVlanID()); HostId targetHostId = HostId.hostId(MacAddress.valueOf( - arpRequest.getTargetHardwareAddress())); + arpRequest.getTargetHardwareAddress()), + vlanId); - // ARP request for router + // ARP request for router. Send ARP reply. if (isArpReqForRouter(deviceId, arpRequest)) { Ip4Address targetAddress = Ip4Address.valueOf(arpRequest.getTargetProtocolAddress()); - - sendArpResponse(arpRequest, config.getRouterMacForAGatewayIp(targetAddress)); + sendArpResponse(arpRequest, config.getRouterMacForAGatewayIp(targetAddress), vlanId); } else { Host targetHost = srManager.hostService.getHost(targetHostId); - // ARP request for known hosts + // ARP request for known hosts. Send proxy ARP reply on behalf of the target. if (targetHost != null) { - sendArpResponse(arpRequest, targetHost.mac()); + removeVlanAndForward(payload, targetHost.location()); + // ARP request for unknown host in the subnet. Flood in the subnet. + } else { + removeVlanAndFlood(payload, inPort); + } + } + } - // ARP request for unknown host in the subnet - } else if (isArpReqForSubnet(deviceId, arpRequest)) { - flood(payload, inPort); + private void handleArpReply(DeviceId deviceId, ConnectPoint inPort, Ethernet payload) { + ARP arpReply = (ARP) payload.getPayload(); + VlanId vlanId = VlanId.vlanId(payload.getVlanID()); + HostId targetHostId = HostId.hostId(MacAddress.valueOf( + arpReply.getTargetHardwareAddress()), + vlanId); + + // ARP reply for router. Process all pending IP packets. + if (isArpReqForRouter(deviceId, arpReply)) { + Ip4Address hostIpAddress = Ip4Address.valueOf(arpReply.getSenderProtocolAddress()); + srManager.ipHandler.forwardPackets(deviceId, hostIpAddress); + } else { + Host targetHost = srManager.hostService.getHost(targetHostId); + // ARP reply for known hosts. Forward to the host. + if (targetHost != null) { + removeVlanAndForward(payload, targetHost.location()); + // ARP reply for unknown host, Flood in the subnet. + } else { + // Don't flood to non-edge ports + if (vlanId.equals(VlanId.vlanId(srManager.ASSIGNED_VLAN_NO_SUBNET))) { + return; + } + removeVlanAndFlood(payload, inPort); } } } @@ -126,14 +162,6 @@ public class ArpHandler { return false; } - private boolean isArpReqForSubnet(DeviceId deviceId, ARP arpRequest) { - return config.getSubnets(deviceId).stream() - .anyMatch((prefix)-> - prefix.contains(Ip4Address. - valueOf(arpRequest. - getTargetProtocolAddress()))); - } - /** * Sends an APR request for the target IP address to all ports except in-port. * @@ -170,11 +198,10 @@ public class ArpHandler { .setSourceMACAddress(senderMacAddress) .setEtherType(Ethernet.TYPE_ARP).setPayload(arpRequest); - flood(eth, inPort); + removeVlanAndFlood(eth, inPort); } - private void sendArpResponse(ARP arpRequest, MacAddress targetMac) { - + private void sendArpResponse(ARP arpRequest, MacAddress targetMac, VlanId vlanId) { ARP arpReply = new ARP(); arpReply.setHardwareType(ARP.HW_TYPE_ETHERNET) .setProtocolType(ARP.PROTO_TYPE_IP) @@ -193,8 +220,9 @@ public class ArpHandler { .setEtherType(Ethernet.TYPE_ARP).setPayload(arpReply); - HostId dstId = HostId.hostId(MacAddress.valueOf( - arpReply.getTargetHardwareAddress())); + HostId dstId = HostId.hostId( + MacAddress.valueOf(arpReply.getTargetHardwareAddress()), + vlanId); Host dst = srManager.hostService.getHost(dstId); if (dst == null) { log.warn("Cannot send ARP response to unknown device"); @@ -209,19 +237,51 @@ public class ArpHandler { srManager.packetService.emit(packet); } - private void flood(Ethernet request, ConnectPoint inPort) { - TrafficTreatment.Builder builder; - ByteBuffer buf = ByteBuffer.wrap(request.serialize()); - - for (Port port: srManager.deviceService.getPorts(inPort.deviceId())) { - if (!port.number().equals(inPort.port()) && - port.number().toLong() > 0) { - builder = DefaultTrafficTreatment.builder(); - builder.setOutput(port.number()); - srManager.packetService.emit(new DefaultOutboundPacket(inPort.deviceId(), - builder.build(), buf)); + /** + * Remove VLAN tag and flood to all ports in the same subnet. + * + * @param packet packet to be flooded + * @param inPort where the packet comes from + */ + private void removeVlanAndFlood(Ethernet packet, ConnectPoint inPort) { + Ip4Address targetProtocolAddress = Ip4Address.valueOf( + ((ARP) packet.getPayload()).getTargetProtocolAddress() + ); + + srManager.deviceConfiguration.getSubnetPortsMap(inPort.deviceId()).forEach((subnet, ports) -> { + if (subnet.contains(targetProtocolAddress)) { + ports.stream() + .filter(port -> port != inPort.port()) + .forEach(port -> { + removeVlanAndForward(packet, new ConnectPoint(inPort.deviceId(), port)); + }); } - } + }); } + /** + * Remove VLAN tag and packet out to given port. + * + * Note: In current implementation, we expect all communication with + * end hosts within a subnet to be untagged. + * <p> + * For those pipelines that internally assigns a VLAN, the VLAN tag will be + * removed before egress. + * <p> + * For those pipelines that do not assign internal VLAN, the packet remains + * untagged. + * + * @param packet packet to be forwarded + * @param outPort where the packet should be forwarded + */ + private void removeVlanAndForward(Ethernet packet, ConnectPoint outPort) { + packet.setEtherType(Ethernet.TYPE_ARP); + packet.setVlanID(Ethernet.VLAN_UNTAGGED); + ByteBuffer buf = ByteBuffer.wrap(packet.serialize()); + + TrafficTreatment.Builder tbuilder = DefaultTrafficTreatment.builder(); + tbuilder.setOutput(outPort.port()); + srManager.packetService.emit(new DefaultOutboundPacket(outPort.deviceId(), + tbuilder.build(), buf)); + } } |