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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.hc2vpp.routing.naming;
import com.google.common.net.InetAddresses;
import io.fd.hc2vpp.common.translate.util.NamingContext;
import io.fd.hc2vpp.routing.trait.RouteMapper;
import io.fd.hc2vpp.routing.write.trait.RouteRequestProducer;
import io.fd.honeycomb.translate.MappingContext;
import io.fd.vpp.jvpp.core.dto.Ip6FibDetails;
import io.fd.vpp.jvpp.core.types.FibPath;
import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.ipv6.unicast.routing.rev180319.VppIpv6NextHopAugmentation;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ipv6.unicast.routing.rev180313.routing.control.plane.protocols.control.plane.protocol._static.routes.ipv6.Route;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ipv6.unicast.routing.rev180313.routing.control.plane.protocols.control.plane.protocol._static.routes.ipv6.route.next.hop.NextHop1;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.rev180313.next.hop.content.next.hop.options.next.hop.list.next.hop.list.NextHop;
public final class Ipv6RouteNamesFactory implements RouteMapper, RouteRequestProducer {
private static final String COLON = ":";
private static final String DASH = "-";
private static final String UNDERSCORE = "_";
private final NamingContext interfaceContext;
private final NamingContext routingProtocolContext;
public Ipv6RouteNamesFactory(@Nonnull final NamingContext interfaceContext,
@Nonnull final NamingContext routingProtocolContext) {
this.interfaceContext = interfaceContext;
this.routingProtocolContext = routingProtocolContext;
}
/**
* Construct unique name from provided {@code Route}
*/
public String uniqueRouteName(@Nonnull final String parentProtocolName,
@Nonnull final Route route) {
return bindName(parentProtocolName,
// to have address in compressed form
doubleDotlessAddress(route.getDestinationPrefix()),
route.getDestinationPrefix().getValue().substring(route.getDestinationPrefix().getValue().indexOf('/') + 1));
}
/**
* Construct unique name from provided {@code IpFibDetails}
*/
public String uniqueRouteName(@Nonnull final Ip6FibDetails details, @Nonnull final MappingContext mappingContext) {
return bindName(routingProtocolContext.getName(details.tableId, mappingContext),
doubleDotlessAddress(details.address),
String.valueOf(Byte.toUnsignedInt(details.addressLength)));
}
/**
* Construct unique name from provided parentProtocolName and {@code Ipv6Prefix}
*/
public String uniqueRouteName(@Nonnull final String parentProtocolName, @Nonnull final Ipv6Prefix prefix) {
return bindName(parentProtocolName, doubleDotlessAddress(prefix),
prefix.getValue().substring(prefix.getValue().indexOf('/') + 1));
}
public Ipv6Prefix ipv6PrefixFromUniqueRouteName(@Nonnull final String uniqueName) {
String[] parts = uniqueName.split(UNDERSCORE);
return new Ipv6Prefix(coloned(parts[1]) + "/" + parts[2]);
}
public String uniqueRouteHopName(@Nonnull final NextHop hop) {
return bindName(hop.getOutgoingInterface(),
doubleDotlessAddress(hop.augmentation(NextHop1.class).getNextHopAddress()),
String.valueOf(hop.augmentation(VppIpv6NextHopAugmentation.class).getWeight()));
}
public String uniqueRouteHopName(@Nonnull final FibPath path, @Nonnull final MappingContext mappingContext) {
return bindName(interfaceContext.getName(path.swIfIndex, mappingContext),
doubleDotlessAddress(path.nextHop),
String.valueOf(path.weight));
}
/**
* Uses combination of standard java.net.InetAddress and com.google.common.net.InetAddresses for following reasons
* <ul>
* <li>
* InetAddresses.toAddrString uses maximal ipv6 compression - eliminate possibility of mismatch between same
* addresses with different compression
* </li>
* <li>
* InetAddress.getByAddress just converts byte array to address, that's
* why InetAddresses.fromLittleEndianByteArray is not used, because it internaly reverts order of address
* bytes,which is something that is not needed here
* </li>
* </ul>
*/
private String doubleDotlessAddress(final byte[] address) {
try {
return doubleDotless(InetAddresses.toAddrString(InetAddress.getByAddress(address)));
} catch (UnknownHostException e) {
throw new IllegalArgumentException(e);
}
}
private String doubleDotlessAddress(@Nonnull final Ipv6Prefix address) {
final String addressValue = address.getValue();
return doubleDotless(compressedIpv6(addressValue.substring(0, addressValue.indexOf("/"))));
}
private String doubleDotlessAddress(@Nonnull final Ipv6Address address) {
// converted to use maximal compression
// for details - https://google.github.io/guava/releases/snapshot/api/docs/com/google/common/net/InetAddresses.html#toAddrString-java.net.InetAddress
return doubleDotless(compressedIpv6(address.getValue()));
}
/**
* Use maximal compresion of ipv6 address string
*/
private String compressedIpv6(@Nonnull final String input) {
return InetAddresses.toAddrString(InetAddresses.forString(input));
}
private String doubleDotless(@Nonnull final String input) {
return input.replace(COLON, DASH);
}
private String coloned(@Nonnull final String input) {
return input.replace(DASH, COLON);
}
}
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