private void sendPacketOut(ConnectPoint outport, Ethernet payload, int sid) {
IPv4 ipPacket = (IPv4) payload.getPayload();
Ip4Address destIpAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
if (sid == -1
|| config.getSegmentId(payload.getDestinationMAC()) == 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.info("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(((IPv4) payload.getPayload()).getTtl());
mplsPkt.setPayload(payload.getPayload());
payload.setPayload(mplsPkt);
OutboundPacket packet =
new DefaultOutboundPacket(
outport.deviceId(), treatment, ByteBuffer.wrap(payload.serialize()));
srManager.packetService.emit(packet);
}
}
/**
* Process incoming ICMP packet. If it is an ICMP request to router or known host, then sends an
* ICMP response. If it is an ICMP packet to known host and forward the packet to the host. If it
* is an ICMP packet to unknown host in a subnet, then sends an ARP request to the subnet.
*
* @param pkt inbound packet
*/
public void processPacketIn(InboundPacket pkt) {
Ethernet ethernet = pkt.parsed();
IPv4 ipv4 = (IPv4) ethernet.getPayload();
ConnectPoint connectPoint = pkt.receivedFrom();
DeviceId deviceId = connectPoint.deviceId();
Ip4Address destinationAddress = Ip4Address.valueOf(ipv4.getDestinationAddress());
Set<Ip4Address> gatewayIpAddresses = config.getPortIPs(deviceId);
Ip4Address routerIp;
try {
routerIp = config.getRouterIp(deviceId);
} catch (DeviceConfigNotFoundException e) {
log.warn(e.getMessage() + " Aborting processPacketIn.");
return;
}
IpPrefix routerIpPrefix = IpPrefix.valueOf(routerIp, IpPrefix.MAX_INET_MASK_LENGTH);
Ip4Address routerIpAddress = routerIpPrefix.getIp4Prefix().address();
// ICMP to the router IP or gateway IP
if (((ICMP) ipv4.getPayload()).getIcmpType() == ICMP.TYPE_ECHO_REQUEST
&& (destinationAddress.equals(routerIpAddress)
|| gatewayIpAddresses.contains(destinationAddress))) {
sendICMPResponse(ethernet, connectPoint);
// ICMP for any known host
} else if (!srManager.hostService.getHostsByIp(destinationAddress).isEmpty()) {
// TODO: known host packet should not be coming to controller - resend flows?
srManager.ipHandler.forwardPackets(deviceId, destinationAddress);
// ICMP for an unknown host in the subnet of the router
} else if (config.inSameSubnet(deviceId, destinationAddress)) {
srManager.arpHandler.sendArpRequest(deviceId, destinationAddress, connectPoint);
// ICMP for an unknown host
} else {
log.debug("ICMP request for unknown host {} ", destinationAddress);
// Do nothing
}
}
