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/*
* Copyright 2015-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.segmentrouting;
import org.onlab.packet.Ethernet;
import org.onlab.packet.ICMP;
import org.onlab.packet.ICMP6;
import org.onlab.packet.IPv4;
import org.onlab.packet.IPv6;
import org.onlab.packet.Ip4Address;
import org.onlab.packet.Ip6Address;
import org.onlab.packet.IpAddress;
import org.onlab.packet.MPLS;
import org.onlab.packet.MacAddress;
import org.onlab.packet.VlanId;
import org.onlab.packet.ndp.NeighborSolicitation;
import org.onosproject.incubator.net.neighbour.NeighbourMessageContext;
import org.onosproject.incubator.net.neighbour.NeighbourMessageType;
import org.onosproject.incubator.net.routing.ResolvedRoute;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.DeviceId;
import org.onosproject.net.flow.DefaultTrafficTreatment;
import org.onosproject.net.flow.TrafficTreatment;
import org.onosproject.net.host.HostService;
import org.onosproject.net.packet.DefaultOutboundPacket;
import org.onosproject.net.packet.OutboundPacket;
import org.onosproject.segmentrouting.config.DeviceConfigNotFoundException;
import org.onosproject.segmentrouting.config.SegmentRoutingAppConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Optional;
import java.util.Set;
/**
* Handler of ICMP packets that responses or forwards ICMP packets that
* are sent to the controller.
*/
public class IcmpHandler extends SegmentRoutingNeighbourHandler {
private static Logger log = LoggerFactory.getLogger(IcmpHandler.class);
/**
* Creates an IcmpHandler object.
*
* @param srManager SegmentRoutingManager object
*/
public IcmpHandler(SegmentRoutingManager srManager) {
super(srManager);
}
/**
* Utility function to send packet out.
*
* @param outport the output port
* @param payload the packet to send
* @param sid the segment id
* @param destIpAddress the destination ip address
* @param allowedHops the hop limit/ttl
*/
private void sendPacketOut(ConnectPoint outport,
Ethernet payload,
int sid,
IpAddress destIpAddress,
byte allowedHops) {
int destSid;
if (destIpAddress.isIp4()) {
destSid = config.getIPv4SegmentId(payload.getDestinationMAC());
} else {
destSid = config.getIPv6SegmentId(payload.getDestinationMAC());
}
if (sid == -1 || destSid == sid ||
config.inSameSubnet(outport.deviceId(), destIpAddress)) {
TrafficTreatment treatment = DefaultTrafficTreatment.builder().
setOutput(outport.port()).build();
OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
treatment, ByteBuffer.wrap(payload.serialize()));
srManager.packetService.emit(packet);
} else {
log.debug("Send a MPLS packet as a ICMP response");
TrafficTreatment treatment = DefaultTrafficTreatment.builder()
.setOutput(outport.port())
.build();
payload.setEtherType(Ethernet.MPLS_UNICAST);
MPLS mplsPkt = new MPLS();
mplsPkt.setLabel(sid);
mplsPkt.setTtl(allowedHops);
mplsPkt.setPayload(payload.getPayload());
payload.setPayload(mplsPkt);
OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
treatment, ByteBuffer.wrap(payload.serialize()));
srManager.packetService.emit(packet);
}
}
//////////////////////////////////////
// ICMP Echo/Reply Protocol //
//////////////////////////////////////
/**
* Process incoming ICMP packet.
* If it is an ICMP request to router, then sends an ICMP response.
* Otherwise ignore the packet.
*
* @param eth inbound ICMP packet
* @param inPort the input port
*/
public void processIcmp(Ethernet eth, ConnectPoint inPort) {
DeviceId deviceId = inPort.deviceId();
IPv4 ipv4Packet = (IPv4) eth.getPayload();
Ip4Address destinationAddress = Ip4Address.valueOf(ipv4Packet.getDestinationAddress());
Set<IpAddress> gatewayIpAddresses = config.getPortIPs(deviceId);
IpAddress routerIp;
try {
routerIp = config.getRouterIpv4(deviceId);
} catch (DeviceConfigNotFoundException e) {
log.warn(e.getMessage() + " Aborting processPacketIn.");
return;
}
// ICMP to the router IP or gateway IP
if (((ICMP) ipv4Packet.getPayload()).getIcmpType() == ICMP.TYPE_ECHO_REQUEST &&
(destinationAddress.equals(routerIp.getIp4Address()) ||
gatewayIpAddresses.contains(destinationAddress))) {
sendIcmpResponse(eth, inPort);
} else {
log.trace("Ignore ICMP that targets for {}", destinationAddress);
}
// We remove the packet from the queue
srManager.ipHandler.dequeuePacket(ipv4Packet, destinationAddress);
}
/**
* Sends an ICMP reply message.
*
* @param icmpRequest the original ICMP request
* @param outport the output port where the ICMP reply should be sent to
*/
private void sendIcmpResponse(Ethernet icmpRequest, ConnectPoint outport) {
Ethernet icmpReplyEth = ICMP.buildIcmpReply(icmpRequest);
IPv4 icmpRequestIpv4 = (IPv4) icmpRequest.getPayload();
IPv4 icmpReplyIpv4 = (IPv4) icmpReplyEth.getPayload();
Ip4Address destIpAddress = Ip4Address.valueOf(icmpRequestIpv4.getSourceAddress());
Ip4Address destRouterAddress = config.getRouterIpAddressForASubnetHost(destIpAddress);
// Note: Source IP of the ICMP request doesn't belong to any configured subnet.
// The source might be an indirectly attached host (e.g. behind a router)
// Lookup the route store for the nexthop instead.
if (destRouterAddress == null) {
Optional<ResolvedRoute> nexthop = srManager.routeService.longestPrefixLookup(destIpAddress);
if (nexthop.isPresent()) {
try {
destRouterAddress = config.getRouterIpv4(nexthop.get().location().deviceId());
} catch (DeviceConfigNotFoundException e) {
log.warn("Device config not found. Abort ICMP processing");
return;
}
}
}
int destSid = config.getIPv4SegmentId(destRouterAddress);
if (destSid < 0) {
log.warn("Failed to lookup SID of the switch that {} attaches to. " +
"Unable to process ICMP request.", destIpAddress);
return;
}
sendPacketOut(outport, icmpReplyEth, destSid, destIpAddress, icmpReplyIpv4.getTtl());
}
///////////////////////////////////////////
// ICMPv6 Echo/Reply Protocol //
///////////////////////////////////////////
/**
* Process incoming ICMPv6 packet.
* If it is an ICMPv6 request to router, then sends an ICMPv6 response.
* Otherwise ignore the packet.
*
* @param eth the incoming ICMPv6 packet
* @param inPort the input port
*/
public void processIcmpv6(Ethernet eth, ConnectPoint inPort) {
DeviceId deviceId = inPort.deviceId();
IPv6 ipv6Packet = (IPv6) eth.getPayload();
Ip6Address destinationAddress = Ip6Address.valueOf(ipv6Packet.getDestinationAddress());
Set<IpAddress> gatewayIpAddresses = config.getPortIPs(deviceId);
IpAddress routerIp;
try {
routerIp = config.getRouterIpv6(deviceId);
} catch (DeviceConfigNotFoundException e) {
log.warn(e.getMessage() + " Aborting processPacketIn.");
return;
}
ICMP6 icmp6 = (ICMP6) ipv6Packet.getPayload();
// ICMP to the router IP or gateway IP
if (icmp6.getIcmpType() == ICMP6.ECHO_REQUEST &&
(destinationAddress.equals(routerIp.getIp6Address()) ||
gatewayIpAddresses.contains(destinationAddress))) {
sendIcmpv6Response(eth, inPort);
} else {
log.trace("Ignore ICMPv6 that targets for {}", destinationAddress);
}
}
/**
* Sends an ICMPv6 reply message.
*
* Note: we assume that packets sending from the edge switches to the hosts
* have untagged VLAN.
* @param ethRequest the original ICMP request
* @param outport the output port where the ICMP reply should be sent to
*/
private void sendIcmpv6Response(Ethernet ethRequest, ConnectPoint outport) {
// Note: We assume that packets arrive at the edge switches have untagged VLAN.
Ethernet ethReply = ICMP6.buildIcmp6Reply(ethRequest);
IPv6 icmpRequestIpv6 = (IPv6) ethRequest.getPayload();
IPv6 icmpReplyIpv6 = (IPv6) ethRequest.getPayload();
Ip6Address destIpAddress = Ip6Address.valueOf(icmpRequestIpv6.getSourceAddress());
Ip6Address destRouterAddress = config.getRouterIpAddressForASubnetHost(destIpAddress);
// Note: Source IP of the ICMP request doesn't belong to any configured subnet.
// The source might be an indirect host behind a router.
// Lookup the route store for the nexthop instead.
if (destRouterAddress == null) {
Optional<ResolvedRoute> nexthop = srManager.routeService.longestPrefixLookup(destIpAddress);
if (nexthop.isPresent()) {
try {
destRouterAddress = config.getRouterIpv6(nexthop.get().location().deviceId());
} catch (DeviceConfigNotFoundException e) {
log.warn("Device config not found. Abort ICMPv6 processing");
return;
}
}
}
int sid = config.getIPv6SegmentId(destRouterAddress);
if (sid < 0) {
log.warn("Failed to lookup SID of the switch that {} attaches to. " +
"Unable to process ICMPv6 request.", destIpAddress);
return;
}
sendPacketOut(outport, ethReply, sid, destIpAddress, icmpReplyIpv6.getHopLimit());
}
///////////////////////////////////////////
// ICMPv6 Neighbour Discovery Protocol //
///////////////////////////////////////////
/**
* Process incoming NDP packet.
*
* If it is an NDP request for the router or for the gateway, then sends a NDP reply.
* If it is an NDP request to unknown host flood in the subnet.
* If it is an NDP packet to known host forward the packet to the host.
*
* FIXME If the NDP packets use link local addresses we fail.
*
* @param pkt inbound packet
* @param hostService the host service
*/
public void processPacketIn(NeighbourMessageContext pkt, HostService hostService) {
// First we validate the ndp packet
SegmentRoutingAppConfig appConfig = srManager.cfgService
.getConfig(srManager.appId, SegmentRoutingAppConfig.class);
if (appConfig != null && appConfig.suppressSubnet().contains(pkt.inPort())) {
// Ignore NDP packets come from suppressed ports
pkt.drop();
return;
}
if (pkt.type() == NeighbourMessageType.REQUEST) {
handleNdpRequest(pkt, hostService);
} else {
handleNdpReply(pkt, hostService);
}
}
/**
* Helper method to handle the ndp requests.
*
* @param pkt the ndp packet request and context information
* @param hostService the host service
*/
private void handleNdpRequest(NeighbourMessageContext pkt, HostService hostService) {
// ND request for the gateway. We have to reply on behalf of the gateway.
if (isNdpForGateway(pkt)) {
log.trace("Sending NDP reply on behalf of gateway IP for pkt: {}", pkt);
sendResponse(pkt, config.getRouterMacForAGatewayIp(pkt.target()), hostService);
} else {
// NOTE: Ignore NDP packets except those target for the router
// We will reconsider enabling this when we have host learning support
/*
// ND request for an host. We do a search by Ip.
Set<Host> hosts = hostService.getHostsByIp(pkt.target());
// Possible misconfiguration ? In future this case
// should be handled we can have same hosts in different VLANs.
if (hosts.size() > 1) {
log.warn("More than one host with IP {}", pkt.target());
}
Host targetHost = hosts.stream().findFirst().orElse(null);
// If we know the host forward to its attachment point.
if (targetHost != null) {
log.debug("Forward NDP request to the target host");
pkt.forward(targetHost.location());
} else {
// Flood otherwise.
log.debug("Flood NDP request to the target subnet");
flood(pkt);
}
*/
}
}
/**
* Helper method to handle the ndp replies.
*
* @param pkt the ndp packet reply and context information
* @param hostService the host service
*/
private void handleNdpReply(NeighbourMessageContext pkt, HostService hostService) {
if (isNdpForGateway(pkt)) {
log.debug("Forwarding all the ip packets we stored");
Ip6Address hostIpAddress = pkt.sender().getIp6Address();
srManager.ipHandler.forwardPackets(pkt.inPort().deviceId(), hostIpAddress);
} else {
// NOTE: Ignore NDP packets except those target for the router
// We will reconsider enabling this when we have host learning support
/*
HostId hostId = HostId.hostId(pkt.dstMac(), pkt.vlan());
Host targetHost = hostService.getHost(hostId);
if (targetHost != null) {
log.debug("Forwarding the reply to the host");
pkt.forward(targetHost.location());
} else {
// We don't have to flood towards spine facing ports.
if (pkt.vlan().equals(SegmentRoutingManager.INTERNAL_VLAN)) {
return;
}
log.debug("Flooding the reply to the subnet");
flood(pkt);
}
*/
}
}
/**
* Utility to verify if the ND are for the gateway.
*
* @param pkt the ndp packet
* @return true if the ndp is for the gateway. False otherwise
*/
private boolean isNdpForGateway(NeighbourMessageContext pkt) {
DeviceId deviceId = pkt.inPort().deviceId();
Set<IpAddress> gatewayIpAddresses = null;
try {
if (pkt.target().equals(config.getRouterIpv6(deviceId))) {
return true;
}
gatewayIpAddresses = config.getPortIPs(deviceId);
} catch (DeviceConfigNotFoundException e) {
log.warn(e.getMessage() + " Aborting check for router IP in processing ndp");
}
return gatewayIpAddresses != null && gatewayIpAddresses.stream()
.filter(IpAddress::isIp6)
.anyMatch(gatewayIp -> gatewayIp.equals(pkt.target()) ||
Arrays.equals(IPv6.getSolicitNodeAddress(gatewayIp.toOctets()),
pkt.target().toOctets())
);
}
/**
* Sends a NDP request for the target IP address to all ports except in-port.
*
* @param deviceId Switch device ID
* @param targetAddress target IP address for ARP
* @param inPort in-port
*/
public void sendNdpRequest(DeviceId deviceId, IpAddress targetAddress, ConnectPoint inPort) {
byte[] senderMacAddress = new byte[MacAddress.MAC_ADDRESS_LENGTH];
byte[] senderIpAddress = new byte[Ip6Address.BYTE_LENGTH];
// Retrieves device info.
if (!getSenderInfo(senderMacAddress, senderIpAddress, deviceId, targetAddress)) {
log.warn("Aborting sendNdpRequest, we cannot get all the information needed");
return;
}
// We have to compute the dst mac address and dst ip address.
byte[] dstIp = IPv6.getSolicitNodeAddress(targetAddress.toOctets());
byte[] dstMac = IPv6.getMCastMacAddress(dstIp);
// Creates the request.
Ethernet ndpRequest = NeighborSolicitation.buildNdpSolicit(
targetAddress.toOctets(),
senderIpAddress,
dstIp,
senderMacAddress,
dstMac,
VlanId.NONE
);
flood(ndpRequest, inPort, targetAddress);
}
}