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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.util;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import io.fd.honeycomb.translate.MappingContext;
import io.fd.honeycomb.translate.vpp.util.Ipv4Translator;
import io.fd.vpp.jvpp.snat.dto.SnatStaticMappingDetails;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.Contexts;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.NatMappingEntryCtxAugmentation;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.NatMappingEntryContext;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.NatInstance;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.NatInstanceKey;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.nat.instance.MappingTable;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.nat.instance.mapping.table.MappingEntry;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.nat.instance.mapping.table.MappingEntryBuilder;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.nat.context.rev161214.mapping.entry.context.attributes.nat.mapping.entry.context.nat.instance.mapping.table.MappingEntryKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Context tracker for Nat Mapping entries.
*/
@ThreadSafe
public class MappingEntryContext implements Ipv4Translator {
private static final Logger LOG = LoggerFactory.getLogger(MappingEntryContext.class);
/**
* Add mapping entry to index mapping to context.
*/
public synchronized void addEntry(final long natInstanceId,
final long entryId,
@Nonnull final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry,
@Nonnull final MappingContext mappingContext) {
final InstanceIdentifier<MappingEntry> id = getId(natInstanceId, entryToKey(entry));
checkArgument(!containsEntry(natInstanceId, entry, mappingContext), "Mapping for %s already present", id);
mappingContext.put(id, toCtxMapEntry(entry, entryId));
}
/**
* Check whether mapping entry to index mapping already exists in context.
*/
public synchronized boolean containsEntry(final long natInstanceId,
@Nonnull final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry,
@Nonnull final MappingContext mappingContext) {
final InstanceIdentifier<MappingEntry> id = getId(natInstanceId, entryToKey(entry));
return mappingContext.read(id).isPresent();
}
@VisibleForTesting
static InstanceIdentifier<MappingEntry> getId(final Long natInstanceId, final MappingEntryKey key) {
return getTableId(natInstanceId).child(MappingEntry.class, key);
}
@VisibleForTesting
static InstanceIdentifier<MappingTable> getTableId(final long natInstanceId) {
return InstanceIdentifier.create(Contexts.class)
.augmentation(NatMappingEntryCtxAugmentation.class)
.child(NatMappingEntryContext.class)
.child(NatInstance.class, new NatInstanceKey(natInstanceId))
.child(MappingTable.class);
}
@VisibleForTesting
static MappingEntryKey entryToKey(
final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry) {
// Only IPv4
return new MappingEntryKey(new IpAddress(entry.getExternalSrcAddress()), entry.getInternalSrcAddress());
}
private MappingEntryKey entryToKey(final SnatStaticMappingDetails entry) {
// Only IPv4
return new MappingEntryKey(
new IpAddress(new Ipv4Address(arrayToIpv4AddressNoZoneReversed(entry.externalIpAddress))),
new IpAddress(new Ipv4Address(arrayToIpv4AddressNoZoneReversed(entry.localIpAddress))));
}
private boolean equalEntries(final SnatStaticMappingDetails detail, final MappingEntry ctxMappingEntry) {
final IpAddress internalAddrFromDetails =
new IpAddress(new Ipv4Address(arrayToIpv4AddressNoZoneReversed(detail.localIpAddress)));
// Only IPv4
if (!ctxMappingEntry.getInternal().equals(internalAddrFromDetails)) {
return false;
}
// Only IPv4
final IpAddress externalAddrFromDetails =
new IpAddress(new Ipv4Address(arrayToIpv4AddressNoZoneReversed(detail.externalIpAddress)));
if (!ctxMappingEntry.getExternal().equals(externalAddrFromDetails)) {
return false;
}
return true;
}
@VisibleForTesting
static MappingEntry toCtxMapEntry(
@Nonnull final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry,
final long entryId) {
return new MappingEntryBuilder()
.setKey(entryToKey(entry))
.setIndex(entryId)
.build();
}
private MappingEntry toCtxMapEntry(@Nonnull final SnatStaticMappingDetails details, final long entryId) {
return new MappingEntryBuilder()
.setKey(entryToKey(details))
.setIndex(entryId)
.build();
}
/**
* Delete mapping of mapping entry to index from context.
*/
public synchronized void removeEntry(final long natInstanceId,
@Nonnull final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry,
@Nonnull final MappingContext mappingContext) {
mappingContext.delete(getId(natInstanceId, entryToKey(entry)));
}
/**
* Find specific details in provided collection identified with provided index.
*/
public synchronized SnatStaticMappingDetails findDetails(@Nonnull final List<SnatStaticMappingDetails> details,
final long natInstanceId, final long idx,
@Nonnull final MappingContext mappingContext) {
// Find mapping entry for Index
final MappingEntry ctxMappingEntry = mappingContext.read(getTableId(natInstanceId))
.transform(MappingTable::getMappingEntry)
.or(Collections.emptyList())
.stream()
.filter(entry -> entry.getIndex() == idx)
.findFirst()
.orElseThrow(() -> new IllegalStateException("Unable to find context mapping for nat-instance: "
+ natInstanceId + " and ID: " + idx));
// Find which details matches the context stored entry under index
return details.stream()
.filter(detail -> equalEntries(detail, ctxMappingEntry))
.findFirst()
.orElseThrow(() -> new IllegalStateException("Unable to match mapping for nat-instance: "
+ natInstanceId + " and match: " + ctxMappingEntry + " in: " + details));
}
/**
* Get index for a mapping entry details or create an artificial one.
*/
public synchronized long getStoredOrArtificialIndex(final Long natInstanceId,
@Nonnull final SnatStaticMappingDetails details,
@Nonnull final MappingContext mappingContext) {
return mappingContext.read(getId(natInstanceId, entryToKey(details)))
.transform(MappingEntry::getIndex)
.or(() -> getArtificialId(details, natInstanceId, mappingContext));
}
/**
* Get index for a stored mapping entry.
*/
public synchronized Optional<Long> getStoredIndex(final long natInstanceId,
@Nonnull final org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry entry,
@Nonnull final MappingContext mappingContext) {
return mappingContext.read(getId(natInstanceId, entryToKey(entry)))
.transform(MappingEntry::getIndex);
}
private long getArtificialId(final SnatStaticMappingDetails details, final Long natInstanceId,
final MappingContext mappingContext) {
LOG.trace("Assigning artificial ID for {}", details);
final long artificialIdx = findFreeIndex(natInstanceId, mappingContext);
LOG.debug("Artificial ID for {} assigned as: {}", details, artificialIdx);
mappingContext.put(getId(natInstanceId, entryToKey(details)), toCtxMapEntry(details, artificialIdx));
return artificialIdx;
}
private long findFreeIndex(final long natInstanceId, final MappingContext mappingContext) {
return mappingContext.read(getTableId(natInstanceId))
.transform(MappingTable::getMappingEntry)
.or(Collections.emptyList())
.stream()
.map(MappingEntry::getIndex)
.max(Comparator.naturalOrder())
.map(i -> i + 1)
.orElse(0L);
}
}
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