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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 io.fd.hc2vpp.common.translate.util.Ipv4Translator;
import io.fd.vpp.jvpp.core.dto.MplsRouteAddDel;
import java.util.List;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.LabelIndexTlv;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.OriginatorSrgbTlv;
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.labeled.unicast.rev150525.originator.srgb.tlv.SrgbValue;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.BgpPrefixSid;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.bgp.prefix.sid.BgpPrefixSidTlvs;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.attributes.bgp.prefix.sid.bgp.prefix.sid.tlvs.BgpPrefixSidTlv;
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;
import org.slf4j.Logger;
interface MplsRouteRequestProducer extends Ipv4Translator {
/**
* Constant used by VPP to disable optional parameters of mpls label type.
*/
int MPLS_LABEL_INVALID = 0x100000;
/**
* Produces {@link MplsRouteAddDel} request for derived local label entry
* that swaps it for the received outbound label.
*
* @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 MPLS 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 MplsRouteAddDel mplsRouteAddDelFor(@Nonnull final LabeledUnicastRoute route, final boolean isAdd,
@Nonnull final Logger logger) {
final MplsRouteAddDel request = Impl.mplsRouteAddDel(isAdd);
Impl.translate(route.getAttributes().getCNextHop(), request);
Impl.translate(route.getAttributes().getBgpPrefixSid(), request, logger);
Impl.translate(route.getLabelStack(), request);
return request;
}
final class Impl implements Ipv4Translator {
private static MplsRouteAddDel mplsRouteAddDel(final boolean isAdd) {
final MplsRouteAddDel request = new MplsRouteAddDel();
request.mrIsAdd = Ipv4Translator.INSTANCE.booleanToByte(isAdd);
// default values based on inspecting VPP's CLI and make test code
request.mrClassifyTableIndex = -1;
request.mrNextHopWeight = 1;
request.mrNextHopViaLabel = MPLS_LABEL_INVALID;
return request;
}
private static void translate(@Nonnull final CNextHop nextHop, @Nonnull final MplsRouteAddDel request) {
checkArgument(nextHop instanceof Ipv4NextHopCase, "only ipv4 next hop is supported, but was %s", nextHop);
final Ipv4Address nextHopAddress = ((Ipv4NextHopCase) nextHop).getIpv4NextHop().getGlobal();
request.mrNextHop = 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.mrNextHopSwIfIndex = -1;
}
private static void translate(@Nonnull final BgpPrefixSid bgpPrefixSid, @Nonnull final MplsRouteAddDel request,
@Nonnull final Logger logger) {
Long labelIndex = null;
OriginatorSrgbTlv originatorSrgb = null;
for (BgpPrefixSidTlvs entry : bgpPrefixSid.getBgpPrefixSidTlvs()) {
final BgpPrefixSidTlv tlv = entry.getBgpPrefixSidTlv();
if (tlv instanceof LabelIndexTlv) {
if (labelIndex != null) {
logger.warn("More than one label-index-tlv encountered while parsing bgp-prefix-sid-tlvs: %s."
+ "Ignoring all but %s", bgpPrefixSid, labelIndex);
} else {
labelIndex = ((LabelIndexTlv) tlv).getLabelIndexTlv();
}
} else if (tlv instanceof OriginatorSrgbTlv) {
if (originatorSrgb != null) {
logger
.warn("More than one originator-srgb-tlv encountered while parsing bgp-prefix-sid-tlvs: %s."
+ "Ignoring all but %s", bgpPrefixSid, originatorSrgb);
} else {
originatorSrgb = (OriginatorSrgbTlv) tlv;
}
}
}
// TODO(HC2VPP-272): add support for dynamic (random) label (RFC3107)
checkArgument(labelIndex != null, "Missing label-index-tlv");
// TODO(HC2VPP-272): the originator-srgb-tlv is optional,
// make SRGB range configurable via netconf (requires writeConfig)
checkArgument(originatorSrgb != null, "Missing originator-srgb-tlv");
// TODO(HC2VPP-272): add support for more than one SRGB
checkArgument(originatorSrgb.getSrgbValue().size() == 1,
"Only one SRGB range is currently supported, but more than one was defined: %s", originatorSrgb);
// Compute local label based on labelIndex value:
final SrgbValue srgbValue = originatorSrgb.getSrgbValue().get(0);
final long srgbStart = srgbValue.getBase().getValue();
final long localLabel = srgbStart + labelIndex;
final long srgbEnd = srgbStart + srgbValue.getRange().getValue();
checkArgument(localLabel <= srgbEnd && localLabel >= srgbStart);
request.mrLabel = (int) localLabel;
}
private static void translate(@Nonnull final List<LabelStack> labelStack,
@Nonnull final MplsRouteAddDel 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).
// swap one label to another
request.mrNextHopOutLabelStack = new int[] {label};
request.mrNextHopNOutLabels = 1;
}
}
}
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