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/*
* Copyright (c) 2016 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.honeycomb.nat.write;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.base.Optional;
import io.fd.honeycomb.nat.util.MappingEntryContext;
import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
import io.fd.honeycomb.translate.vpp.util.Ipv4Translator;
import io.fd.honeycomb.translate.vpp.util.JvppReplyConsumer;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.vpp.jvpp.snat.dto.SnatAddStaticMapping;
import io.fd.vpp.jvpp.snat.future.FutureJVppSnatFacade;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.PortNumber;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.NatInstance;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntryKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.port.number.PortType;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.port.number.port.type.SinglePortNumber;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class MappingEntryCustomizer implements ListWriterCustomizer<MappingEntry, MappingEntryKey>,
JvppReplyConsumer, Ipv4Translator {
private static final Logger LOG = LoggerFactory.getLogger(MappingEntryCustomizer.class);
private final FutureJVppSnatFacade jvppSnat;
private final MappingEntryContext mappingEntryContext;
MappingEntryCustomizer(final FutureJVppSnatFacade jvppSnat, final MappingEntryContext mappingEntryContext) {
this.jvppSnat = jvppSnat;
this.mappingEntryContext = mappingEntryContext;
}
@Override
public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<MappingEntry> id,
@Nonnull final MappingEntry dataAfter,
@Nonnull final WriteContext writeContext)
throws WriteFailedException {
// Only static mapping supported by SNAT for now
checkArgument(dataAfter.getType() ==
org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.MappingEntry.Type.Static,
"Only static NAT entries are supported currently. Trying to write: %s entry", dataAfter.getType());
final Long natInstanceId = id.firstKeyOf(NatInstance.class).getId();
final Long mappingEntryId = id.firstKeyOf(MappingEntry.class).getIndex();
LOG.debug("Writing mapping entry: {} for nat-instance(vrf): {}", natInstanceId, mappingEntryId);
final SnatAddStaticMapping request = getRequest(id, dataAfter, natInstanceId, true);
getReplyForWrite(jvppSnat.snatAddStaticMapping(request).toCompletableFuture(), id);
// Store context mapping only if not already present under the same exact mapping
synchronized (mappingEntryContext) {
if (shouldStoreContextMapping(natInstanceId, mappingEntryId, dataAfter, writeContext)) {
mappingEntryContext
.addEntry(natInstanceId, mappingEntryId, dataAfter, writeContext.getMappingContext());
}
}
LOG.trace("Mapping entry: {} for nat-instance(vrf): {} written successfully", request.vrfId, id);
}
/**
* Check whether entry is already stored in context under the same index.
*
* @return true if it's not yet stored under same index, false otherwise.
*/
private boolean shouldStoreContextMapping(final long natInstanceId, final long mappingEntryId,
final MappingEntry dataAfter,
final WriteContext writeCtx) {
if (!mappingEntryContext.containsEntry(natInstanceId, dataAfter, writeCtx.getMappingContext())) {
return true;
}
final Optional<Long> storedIndex =
mappingEntryContext.getStoredIndex(natInstanceId, dataAfter, writeCtx.getMappingContext());
if (!storedIndex.isPresent()) {
return true;
}
if (storedIndex.get() != mappingEntryId) {
return true;
}
return false;
}
@Override
public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<MappingEntry> id,
@Nonnull final MappingEntry dataBefore,
@Nonnull final MappingEntry dataAfter,
@Nonnull final WriteContext writeContext) throws WriteFailedException {
throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter,
new UnsupportedOperationException("Mapping entry update not supported"));
}
@Override
public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<MappingEntry> id,
@Nonnull final MappingEntry dataBefore,
@Nonnull final WriteContext writeContext) throws WriteFailedException {
final long natInstanceId = id.firstKeyOf(NatInstance.class).getId();
final MappingEntryKey mappingEntryKey = id.firstKeyOf(MappingEntry.class);
LOG.debug("Deleting mapping entry: {} for nat-instance(vrf): {}", natInstanceId, mappingEntryKey);
final SnatAddStaticMapping request = getRequest(id, dataBefore, natInstanceId, false);
getReplyForWrite(jvppSnat.snatAddStaticMapping(request).toCompletableFuture(), id);
mappingEntryContext.removeEntry(natInstanceId, dataBefore, writeContext.getMappingContext());
LOG.trace("Mapping entry: {} for nat-instance(vrf): {} deleted successfully", request.vrfId, id);
}
private SnatAddStaticMapping getRequest(final InstanceIdentifier<MappingEntry> id,
final MappingEntry dataAfter,
final Long natInstanceId,
final boolean isAdd)
throws WriteFailedException.CreateFailedException {
final SnatAddStaticMapping request = new SnatAddStaticMapping();
request.isAdd = isAdd
? (byte) 1
: 0;
request.isIp4 = 1;
// VPP uses int, model long
request.vrfId = natInstanceId.intValue();
// Snat supports only ipv4 now
if (dataAfter.getInternalSrcAddress().getIpv4Address() == null) {
throw new WriteFailedException.CreateFailedException(id, dataAfter,
new UnsupportedOperationException(
String.format("No Ipv4 present for in address %s. Ipv6 not supported",
dataAfter.getInternalSrcAddress())));
}
request.addrOnly = 1;
request.localIpAddress =
ipv4AddressNoZoneToArray(dataAfter.getInternalSrcAddress().getIpv4Address().getValue());
request.externalIpAddress = ipv4AddressNoZoneToArray(dataAfter.getExternalSrcAddress().getValue());
Optional<Short> internalPortNumber = getPortNumber(id, dataAfter,
(entry) -> Optional.fromNullable(entry.getInternalSrcPort()).transform(PortNumber::getPortType));
Optional<Short> externalPortNumber = getPortNumber(id, dataAfter,
(entry) -> Optional.fromNullable(entry.getExternalSrcPort()).transform(PortNumber::getPortType));
if (internalPortNumber.isPresent() && externalPortNumber.isPresent()) {
request.addrOnly = 0;
request.localPort = internalPortNumber.get();
request.externalPort = externalPortNumber.get();
}
return request;
}
private Optional<Short> getPortNumber(final InstanceIdentifier<MappingEntry> id, final MappingEntry dataAfter,
final PortGetter portGetter) {
return portGetter.getPortType(dataAfter).transform(port -> {
if (port instanceof SinglePortNumber) {
return ((SinglePortNumber) port).getSinglePortNumber().getValue().shortValue();
} else {
throw new IllegalArgumentException(
String.format("Only single port number supported. Submitted: %s for entry: %s",
dataAfter.getInternalSrcPort(), id));
}
});
}
interface PortGetter {
Optional<PortType> getPortType(MappingEntry entry);
}
}
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