vpnservice/ipv6service/impl/src/main/java/org/opendaylight/netvirt/ipv6service/Ipv6RouterAdvt.java

   1 /*
   2  * Copyright (c) 2016 Dell Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.netvirt.ipv6service;
  10
  11 import java.nio.ByteBuffer;
  12 import java.util.ArrayList;
  13 import java.util.Arrays;
  14 import java.util.List;
  15 import org.opendaylight.netvirt.ipv6service.utils.Ipv6Constants;
  16 import org.opendaylight.netvirt.ipv6service.utils.Ipv6Constants.Ipv6RtrAdvertType;
  17 import org.opendaylight.netvirt.ipv6service.utils.Ipv6ServiceUtils;
  18 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
  21 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorRef;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeRef;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.EthernetHeader;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.Ipv6Header;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.RouterAdvertisementPacket;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.RouterAdvertisementPacketBuilder;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.RouterSolicitationPacket;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.router.advertisement.packet.PrefixList;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.ipv6service.nd.packet.rev160620.router.advertisement.packet.PrefixListBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketProcessingService;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.TransmitPacketInput;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.TransmitPacketInputBuilder;
  35 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 public class Ipv6RouterAdvt {
  40     private static final Logger LOG = LoggerFactory.getLogger(Ipv6RouterAdvt.class);
  41     private static PacketProcessingService pktService;
  42     private Ipv6ServiceUtils ipv6Utils;
  43
  44     public Ipv6RouterAdvt() {
  45         ipv6Utils = Ipv6ServiceUtils.getInstance();
  46     }
  47
  48     public static void setPacketProcessingService(PacketProcessingService packetService) {
  49         pktService = packetService;
  50     }
  51
  52     public boolean transmitRtrAdvertisement(Ipv6RtrAdvertType raType, VirtualPort routerPort,
  53                                             NodeConnectorRef outport, RouterSolicitationPacket rsPdu) {
  54         if (pktService == null) {
  55             LOG.debug("transmitRtrAdvertisement packet processing service is not yet configured");
  56             return false;
  57         }
  58         RouterAdvertisementPacketBuilder raPacket = new RouterAdvertisementPacketBuilder();
  59         updateRAResponse(raType, rsPdu, raPacket, routerPort);
  60         // Serialize the response packet
  61         byte[] txPayload = fillRouterAdvertisementPacket(raPacket.build());
  62         InstanceIdentifier<Node> outNode = outport.getValue().firstIdentifierOf(Node.class);
  63         TransmitPacketInput input = new TransmitPacketInputBuilder().setPayload(txPayload)
  64                 .setNode(new NodeRef(outNode))
  65                 .setEgress(outport).build();
  66         LOG.debug("Transmitting the Router Advt packet out {}", outport);
  67         pktService.transmitPacket(input);
  68         return true;
  69     }
  70
  71     private void updateRAResponse(Ipv6RtrAdvertType raType, RouterSolicitationPacket pdu,
  72                                   RouterAdvertisementPacketBuilder raPacket,
  73                                   VirtualPort routerPort) {
  74         short icmpv6RaFlags = 0;
  75         String gatewayMac = null;
  76         IpAddress gatewayIp;
  77         List<String> autoConfigPrefixList = new ArrayList<String>();
  78         List<String> statefulConfigPrefixList = new ArrayList<String>();
  79
  80         for (VirtualSubnet subnet : routerPort.getSubnets()) {
  81             gatewayIp = subnet.getGatewayIp();
  82             // Skip if its a v4 subnet.
  83             if (gatewayIp.getIpv4Address() != null) {
  84                 continue;
  85             }
  86
  87             if (!subnet.getIpv6RAMode().isEmpty()) {
  88                 if (Ipv6Constants.IPV6_AUTO_ADDRESS_SUBNETS.contains(subnet.getIpv6RAMode())) {
  89                     autoConfigPrefixList.add(String.valueOf(subnet.getSubnetCidr().getValue()));
  90                 }
  91
  92                 if (subnet.getIpv6RAMode().equalsIgnoreCase(Ipv6Constants.IPV6_DHCPV6_STATEFUL)) {
  93                     statefulConfigPrefixList.add(String.valueOf(subnet.getSubnetCidr().getValue()));
  94                 }
  95             }
  96
  97             if (subnet.getIpv6RAMode().equalsIgnoreCase(Ipv6Constants.IPV6_DHCPV6_STATELESS)) {
  98                 icmpv6RaFlags = (short) (icmpv6RaFlags | (1 << 6)); // Other Configuration.
  99             } else if (subnet.getIpv6RAMode().equalsIgnoreCase(Ipv6Constants.IPV6_DHCPV6_STATEFUL)) {
 100                 icmpv6RaFlags = (short) (icmpv6RaFlags | (1 << 7)); // Managed Address Conf.
 101             }
 102         }
 103
 104         gatewayMac = routerPort.getMacAddress();
 105
 106         MacAddress sourceMac = MacAddress.getDefaultInstance(gatewayMac);
 107         raPacket.setSourceMac(sourceMac);
 108         if (raType == Ipv6RtrAdvertType.SOLICITED_ADVERTISEMENT) {
 109             raPacket.setDestinationMac(pdu.getSourceMac());
 110             raPacket.setDestinationIpv6(pdu.getSourceIpv6());
 111             raPacket.setFlowLabel(pdu.getFlowLabel());
 112         } else {
 113             raPacket.setDestinationMac(new MacAddress(Ipv6Constants.DEF_MCAST_MAC));
 114             raPacket.setDestinationIpv6(Ipv6ServiceUtils.ALL_NODES_MCAST_ADDR);
 115             raPacket.setFlowLabel(Ipv6Constants.DEF_FLOWLABEL);
 116         }
 117
 118         raPacket.setEthertype(Ipv6Constants.IP_V6_ETHTYPE);
 119
 120         raPacket.setVersion(Ipv6Constants.IPV6_VERSION);
 121         int prefixListLength = autoConfigPrefixList.size() + statefulConfigPrefixList.size();
 122         raPacket.setIpv6Length(Ipv6Constants.ICMPV6_RA_LENGTH_WO_OPTIONS
 123                 + Ipv6Constants.ICMPV6_OPTION_SOURCE_LLA_LENGTH
 124                 + prefixListLength * Ipv6Constants.ICMPV6_OPTION_PREFIX_LENGTH);
 125         raPacket.setNextHeader(Ipv6Constants.ICMP6_NHEADER);
 126         raPacket.setHopLimit(Ipv6Constants.ICMP_V6_MAX_HOP_LIMIT);
 127         raPacket.setSourceIpv6(ipv6Utils.getIpv6LinkLocalAddressFromMac(sourceMac));
 128
 129         raPacket.setIcmp6Type(Ipv6Constants.ICMP_V6_RA_CODE);
 130         raPacket.setIcmp6Code((short)0);
 131         raPacket.setIcmp6Chksum(0);
 132
 133         raPacket.setCurHopLimit((short) Ipv6Constants.IPV6_DEFAULT_HOP_LIMIT);
 134         raPacket.setFlags((short) icmpv6RaFlags);
 135
 136         if (raType == Ipv6RtrAdvertType.CEASE_ADVERTISEMENT) {
 137             raPacket.setRouterLifetime(0);
 138         } else {
 139             raPacket.setRouterLifetime(Ipv6Constants.IPV6_ROUTER_LIFETIME);
 140         }
 141         raPacket.setReachableTime((long) 0);
 142         raPacket.setRetransTime((long) 0);
 143
 144         raPacket.setOptionSourceAddr((short)1);
 145         raPacket.setSourceAddrLength((short)1);
 146         raPacket.setSourceLlAddress(MacAddress.getDefaultInstance(gatewayMac));
 147
 148         List<PrefixList> prefixList = new ArrayList<PrefixList>();
 149         PrefixListBuilder prefix = new PrefixListBuilder();
 150         prefix.setOptionType((short)3);
 151         prefix.setOptionLength((short)4);
 152         // Note: EUI-64 auto-configuration requires 64 bits.
 153         prefix.setPrefixLength((short)64);
 154         prefix.setValidLifetime((long) Ipv6Constants.IPV6_RA_VALID_LIFETIME);
 155         prefix.setPreferredLifetime((long) Ipv6Constants.IPV6_RA_PREFERRED_LIFETIME);
 156         prefix.setReserved((long) 0);
 157
 158         short autoConfPrefixFlags = 0;
 159         autoConfPrefixFlags = (short) (autoConfPrefixFlags | (1 << 7)); // On-link flag
 160         autoConfPrefixFlags = (short) (autoConfPrefixFlags | (1 << 6)); // Autonomous address-configuration flag.
 161         for (String v6Prefix : autoConfigPrefixList) {
 162             prefix.setFlags((short)autoConfPrefixFlags);
 163             prefix.setPrefix(new Ipv6Prefix(v6Prefix));
 164             prefixList.add(prefix.build());
 165         }
 166
 167         short statefulPrefixFlags = 0;
 168         statefulPrefixFlags = (short) (statefulPrefixFlags | (1 << 7)); // On-link flag
 169         for (String v6Prefix : statefulConfigPrefixList) {
 170             prefix.setFlags((short)statefulPrefixFlags);
 171             prefix.setPrefix(new Ipv6Prefix(v6Prefix));
 172             prefixList.add(prefix.build());
 173         }
 174
 175         raPacket.setPrefixList((List<PrefixList>) prefixList);
 176
 177         return;
 178     }
 179
 180     private byte[] fillRouterAdvertisementPacket(RouterAdvertisementPacket pdu) {
 181         ByteBuffer buf = ByteBuffer.allocate(Ipv6Constants.ICMPV6_OFFSET + pdu.getIpv6Length());
 182
 183         buf.put(ipv6Utils.convertEthernetHeaderToByte((EthernetHeader)pdu), 0, 14);
 184         buf.put(ipv6Utils.convertIpv6HeaderToByte((Ipv6Header)pdu), 0, 40);
 185         buf.put(icmp6RAPayloadtoByte(pdu), 0, pdu.getIpv6Length());
 186         int checksum = ipv6Utils.calcIcmpv6Checksum(buf.array(), (Ipv6Header) pdu);
 187         buf.putShort((Ipv6Constants.ICMPV6_OFFSET + 2), (short)checksum);
 188         return (buf.array());
 189     }
 190
 191     private byte[] icmp6RAPayloadtoByte(RouterAdvertisementPacket pdu) {
 192         byte[] data = new byte[pdu.getIpv6Length()];
 193         Arrays.fill(data, (byte)0);
 194
 195         ByteBuffer buf = ByteBuffer.wrap(data);
 196         buf.put((byte)pdu.getIcmp6Type().shortValue());
 197         buf.put((byte)pdu.getIcmp6Code().shortValue());
 198         buf.putShort((short)pdu.getIcmp6Chksum().intValue());
 199         buf.put((byte)pdu.getCurHopLimit().shortValue());
 200         buf.put((byte)pdu.getFlags().shortValue());
 201         buf.putShort((short)pdu.getRouterLifetime().intValue());
 202         buf.putInt((int)pdu.getReachableTime().longValue());
 203         buf.putInt((int)pdu.getRetransTime().longValue());
 204         buf.put((byte)pdu.getOptionSourceAddr().shortValue());
 205         buf.put((byte)pdu.getSourceAddrLength().shortValue());
 206         buf.put(ipv6Utils.bytesFromHexString(pdu.getSourceLlAddress().getValue().toString()));
 207
 208         for (PrefixList prefix : pdu.getPrefixList()) {
 209             buf.put((byte)prefix.getOptionType().shortValue());
 210             buf.put((byte)prefix.getOptionLength().shortValue());
 211             buf.put((byte)prefix.getPrefixLength().shortValue());
 212             buf.put((byte)prefix.getFlags().shortValue());
 213             buf.putInt((int)prefix.getValidLifetime().longValue());
 214             buf.putInt((int)prefix.getPreferredLifetime().longValue());
 215             buf.putInt((int)prefix.getReserved().longValue());
 216             buf.put(IetfInetUtil.INSTANCE.ipv6PrefixToBytes(new Ipv6Prefix(prefix.getPrefix())),0,16);
 217         }
 218         return data;
 219     }
 220 }