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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
*
* 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 io.fd.hc2vpp.bgp.prefix.sid;
import static com.google.common.base.Preconditions.checkArgument;
import static io.fd.hc2vpp.bgp.prefix.sid.MplsRouteRequestProducer.MPLS_LABEL_INVALID;
import io.fd.hc2vpp.common.translate.util.Ipv4Translator;
import io.fd.vpp.jvpp.core.dto.IpAddDelRoute;
import java.util.List;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.LabelStack;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.routes.list.LabeledUnicastRoute;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.CNextHop;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.next.hop.c.next.hop.Ipv4NextHopCase;
interface IpRouteRequestProducer {
/**
* Produces {@link IpAddDelRoute} request that imposes MPLS label received via BGP LU on packets
* destined to the prefix the label was assigned to.
*
* @param route BPG LU route received via BGP
* @param isAdd determines whether to produce request for adding or removing VPP config
* @return jVpp request for updating VPP IP FIB.
* @see <a href="https://tools.ietf.org/html/rfc3107">Carrying Label Information in BGP-4</a>
* @see <a href="https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07#page-10">BGP Prefix SID: programming
* outgoing label</a>
* @see <a href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-msdc-08#section-4.2.2">FIB example
* for SR in the DC usecase</a>
*/
default IpAddDelRoute ipAddDelRouteFor(@Nonnull final LabeledUnicastRoute route, final boolean isAdd) {
final IpAddDelRoute request = Impl.ipAddDelRoute(isAdd);
Impl.translate(route.getPrefix(), request);
Impl.translate(route.getAttributes().getCNextHop(), request);
Impl.translate(route.getLabelStack(), request);
return request;
}
final class Impl {
private static IpAddDelRoute ipAddDelRoute(final boolean isAdd) {
final IpAddDelRoute request = new IpAddDelRoute();
request.isAdd = Ipv4Translator.INSTANCE.booleanToByte(isAdd);
// default values based on inspecting VPP's CLI and make test code
request.classifyTableIndex = -1;
request.nextHopWeight = 1;
request.nextHopViaLabel = MPLS_LABEL_INVALID;
return request;
}
private static void translate(@Nonnull final IpPrefix prefix, final IpAddDelRoute request) {
// BGP Prefix SID for v6 is not supported
final Ipv4Prefix ipv4Prefix = prefix.getIpv4Prefix();
checkArgument(ipv4Prefix != null, "Unsupported IpPrefix: %s, ipv4Prefix is missing.", prefix);
request.dstAddressLength = Ipv4Translator.INSTANCE.extractPrefix(ipv4Prefix);
request.dstAddress = Ipv4Translator.INSTANCE.ipv4AddressPrefixToArray(ipv4Prefix);
}
private static void translate(@Nonnull final CNextHop nextHop, @Nonnull final IpAddDelRoute request) {
checkArgument(nextHop instanceof Ipv4NextHopCase, "only ipv4 next hop is supported, but was %s", nextHop);
final Ipv4Address nextHopAddress = ((Ipv4NextHopCase) nextHop).getIpv4NextHop().getGlobal();
request.nextHopAddress = Ipv4Translator.INSTANCE.ipv4AddressNoZoneToArray(nextHopAddress.getValue());
// We create recursive route. In order to make everything work,
// operator needs to manually map next hop address to proper interface.
// Either via CLI or HC.
//
// VPP can't recursively resolve a route that has out labels via a route that does not have out labels.
// Implicit null(3) label is trick to get around it (no more labels will be added to the package).
// CLI example:
//
// ip route add <next-hop-prefix> via <next-hop-ifc> out-labels 3
request.nextHopSwIfIndex = -1;
}
private static void translate(@Nonnull final List<LabelStack> labelStack,
@Nonnull final IpAddDelRoute request) {
// It is quite possible we could support multiple labels here, but it was never tested
// so it is not supported currently.
final int labelCount = labelStack.size();
checkArgument(labelCount == 1, "Single label expected, but labelStack.size()==%s", labelCount);
final int label = labelStack.get(0).getLabelValue().getValue().intValue();
// TODO(HC2VPP-271): add support for special labels, e.g. implicit null (for PHP).
// Push label received via BGP on packets destined to the prefix it was assigned to:
request.nextHopOutLabelStack = new int[] {label};
request.nextHopNOutLabels = 1;
}
}
}
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