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sangho80f11cb2015-04-01 13:05:26 -07001/*
Brian O'Connor0947d7e2017-08-03 21:12:30 -07002 * Copyright 2015-present Open Networking Foundation
sangho80f11cb2015-04-01 13:05:26 -07003 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package org.onosproject.segmentrouting;
17
sangho80f11cb2015-04-01 13:05:26 -070018import org.onlab.packet.Ethernet;
19import org.onlab.packet.ICMP;
Pier Ventreb6b81d52016-12-02 08:16:05 -080020import org.onlab.packet.ICMP6;
sangho80f11cb2015-04-01 13:05:26 -070021import org.onlab.packet.IPv4;
Pier Ventreb6b81d52016-12-02 08:16:05 -080022import org.onlab.packet.IPv6;
sangho80f11cb2015-04-01 13:05:26 -070023import org.onlab.packet.Ip4Address;
Pier Ventre1a655962016-11-28 16:48:06 -080024import org.onlab.packet.Ip6Address;
Pier Ventreadb4ae62016-11-23 09:57:42 -080025import org.onlab.packet.IpAddress;
sangho80f11cb2015-04-01 13:05:26 -070026import org.onlab.packet.MPLS;
Pier Ventre1a655962016-11-28 16:48:06 -080027import org.onlab.packet.MacAddress;
28import org.onlab.packet.VlanId;
Pier Ventreb6b81d52016-12-02 08:16:05 -080029import org.onlab.packet.ndp.NeighborSolicitation;
Pier Ventreb6a7f342016-11-26 21:05:22 -080030import org.onosproject.incubator.net.neighbour.NeighbourMessageContext;
Pier Ventre1a655962016-11-28 16:48:06 -080031import org.onosproject.incubator.net.neighbour.NeighbourMessageType;
Charles Chanb8caeab2017-06-02 19:23:51 -070032import org.onosproject.incubator.net.routing.ResolvedRoute;
sangho80f11cb2015-04-01 13:05:26 -070033import org.onosproject.net.ConnectPoint;
34import org.onosproject.net.DeviceId;
35import org.onosproject.net.flow.DefaultTrafficTreatment;
36import org.onosproject.net.flow.TrafficTreatment;
Pier Ventre1a655962016-11-28 16:48:06 -080037import org.onosproject.net.host.HostService;
sangho80f11cb2015-04-01 13:05:26 -070038import org.onosproject.net.packet.DefaultOutboundPacket;
sangho80f11cb2015-04-01 13:05:26 -070039import org.onosproject.net.packet.OutboundPacket;
Charles Chan319d1a22015-11-03 10:42:14 -080040import org.onosproject.segmentrouting.config.DeviceConfigNotFoundException;
Pier Ventre1a655962016-11-28 16:48:06 -080041import org.onosproject.segmentrouting.config.SegmentRoutingAppConfig;
sangho80f11cb2015-04-01 13:05:26 -070042import org.slf4j.Logger;
43import org.slf4j.LoggerFactory;
44
Jonathan Hartd53ebc42015-04-07 16:46:33 -070045import java.nio.ByteBuffer;
Charles Chand3727b72017-03-13 13:10:30 -070046import java.util.Arrays;
Charles Chanb8caeab2017-06-02 19:23:51 -070047import java.util.Optional;
Saurav Dasc28b3432015-10-30 17:45:38 -070048import java.util.Set;
Jonathan Hartd53ebc42015-04-07 16:46:33 -070049
Charles Chanb7f75ac2016-01-11 18:28:54 -080050/**
51 * Handler of ICMP packets that responses or forwards ICMP packets that
52 * are sent to the controller.
53 */
Pier Ventreb6b81d52016-12-02 08:16:05 -080054public class IcmpHandler extends SegmentRoutingNeighbourHandler {
sangho80f11cb2015-04-01 13:05:26 -070055
56 private static Logger log = LoggerFactory.getLogger(IcmpHandler.class);
sangho80f11cb2015-04-01 13:05:26 -070057
58 /**
59 * Creates an IcmpHandler object.
60 *
61 * @param srManager SegmentRoutingManager object
62 */
63 public IcmpHandler(SegmentRoutingManager srManager) {
Pier Ventreb6b81d52016-12-02 08:16:05 -080064 super(srManager);
65 }
66
67 /**
68 * Utility function to send packet out.
69 *
70 * @param outport the output port
71 * @param payload the packet to send
72 * @param sid the segment id
73 * @param destIpAddress the destination ip address
74 * @param allowedHops the hop limit/ttl
75 */
76 private void sendPacketOut(ConnectPoint outport,
77 Ethernet payload,
78 int sid,
79 IpAddress destIpAddress,
80 byte allowedHops) {
81 int destSid;
82 if (destIpAddress.isIp4()) {
83 destSid = config.getIPv4SegmentId(payload.getDestinationMAC());
84 } else {
85 destSid = config.getIPv6SegmentId(payload.getDestinationMAC());
86 }
87
88 if (sid == -1 || destSid == sid ||
89 config.inSameSubnet(outport.deviceId(), destIpAddress)) {
90 TrafficTreatment treatment = DefaultTrafficTreatment.builder().
91 setOutput(outport.port()).build();
92 OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
93 treatment, ByteBuffer.wrap(payload.serialize()));
94 srManager.packetService.emit(packet);
95 } else {
96 log.debug("Send a MPLS packet as a ICMP response");
97 TrafficTreatment treatment = DefaultTrafficTreatment.builder()
98 .setOutput(outport.port())
99 .build();
100
101 payload.setEtherType(Ethernet.MPLS_UNICAST);
102 MPLS mplsPkt = new MPLS();
103 mplsPkt.setLabel(sid);
104 mplsPkt.setTtl(allowedHops);
105 mplsPkt.setPayload(payload.getPayload());
106 payload.setPayload(mplsPkt);
107
108 OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(),
109 treatment, ByteBuffer.wrap(payload.serialize()));
110
111 srManager.packetService.emit(packet);
112 }
sangho80f11cb2015-04-01 13:05:26 -0700113 }
114
Pier Ventre1a655962016-11-28 16:48:06 -0800115 //////////////////////////////////////
116 // ICMP Echo/Reply Protocol //
117 //////////////////////////////////////
118
sangho80f11cb2015-04-01 13:05:26 -0700119 /**
120 * Process incoming ICMP packet.
Charles Chanb78b1132017-03-29 17:24:39 -0700121 * If it is an ICMP request to router, then sends an ICMP response.
122 * Otherwise ignore the packet.
sangho80f11cb2015-04-01 13:05:26 -0700123 *
Pier Ventreb6b81d52016-12-02 08:16:05 -0800124 * @param eth inbound ICMP packet
125 * @param inPort the input port
sangho80f11cb2015-04-01 13:05:26 -0700126 */
Pier Ventreb6b81d52016-12-02 08:16:05 -0800127 public void processIcmp(Ethernet eth, ConnectPoint inPort) {
128 DeviceId deviceId = inPort.deviceId();
129 IPv4 ipv4Packet = (IPv4) eth.getPayload();
130 Ip4Address destinationAddress = Ip4Address.valueOf(ipv4Packet.getDestinationAddress());
Pier Ventreb6a7f342016-11-26 21:05:22 -0800131 Set<IpAddress> gatewayIpAddresses = config.getPortIPs(deviceId);
Pier Ventreadb4ae62016-11-23 09:57:42 -0800132 IpAddress routerIp;
Charles Chan319d1a22015-11-03 10:42:14 -0800133 try {
Pier Ventreadb4ae62016-11-23 09:57:42 -0800134 routerIp = config.getRouterIpv4(deviceId);
Charles Chan319d1a22015-11-03 10:42:14 -0800135 } catch (DeviceConfigNotFoundException e) {
136 log.warn(e.getMessage() + " Aborting processPacketIn.");
137 return;
138 }
sangho80f11cb2015-04-01 13:05:26 -0700139 // ICMP to the router IP or gateway IP
Pier Ventreb6b81d52016-12-02 08:16:05 -0800140 if (((ICMP) ipv4Packet.getPayload()).getIcmpType() == ICMP.TYPE_ECHO_REQUEST &&
141 (destinationAddress.equals(routerIp.getIp4Address()) ||
Srikanth Vavilapalli37a461b2015-04-07 15:12:32 -0700142 gatewayIpAddresses.contains(destinationAddress))) {
Pier Ventreb6b81d52016-12-02 08:16:05 -0800143 sendIcmpResponse(eth, inPort);
sangho80f11cb2015-04-01 13:05:26 -0700144 } else {
Charles Chanb78b1132017-03-29 17:24:39 -0700145 log.trace("Ignore ICMP that targets for {}", destinationAddress);
sangho80f11cb2015-04-01 13:05:26 -0700146 }
Charles Chanb78b1132017-03-29 17:24:39 -0700147 // We remove the packet from the queue
148 srManager.ipHandler.dequeuePacket(ipv4Packet, destinationAddress);
sangho80f11cb2015-04-01 13:05:26 -0700149 }
150
Charles Chanf4586112015-11-09 16:37:23 -0800151 /**
152 * Sends an ICMP reply message.
153 *
Charles Chanf4586112015-11-09 16:37:23 -0800154 * @param icmpRequest the original ICMP request
155 * @param outport the output port where the ICMP reply should be sent to
156 */
Pier Ventreadb4ae62016-11-23 09:57:42 -0800157 private void sendIcmpResponse(Ethernet icmpRequest, ConnectPoint outport) {
Pier Ventreb6b81d52016-12-02 08:16:05 -0800158 Ethernet icmpReplyEth = ICMP.buildIcmpReply(icmpRequest);
sangho80f11cb2015-04-01 13:05:26 -0700159 IPv4 icmpRequestIpv4 = (IPv4) icmpRequest.getPayload();
Pier Ventreb6b81d52016-12-02 08:16:05 -0800160 IPv4 icmpReplyIpv4 = (IPv4) icmpReplyEth.getPayload();
161 Ip4Address destIpAddress = Ip4Address.valueOf(icmpRequestIpv4.getSourceAddress());
sangho9b169e32015-04-14 16:27:13 -0700162 Ip4Address destRouterAddress = config.getRouterIpAddressForASubnetHost(destIpAddress);
Charles Chanb8caeab2017-06-02 19:23:51 -0700163
164 // Note: Source IP of the ICMP request doesn't belong to any configured subnet.
165 // The source might be an indirectly attached host (e.g. behind a router)
166 // Lookup the route store for the nexthop instead.
167 if (destRouterAddress == null) {
168 Optional<ResolvedRoute> nexthop = srManager.routeService.longestPrefixLookup(destIpAddress);
169 if (nexthop.isPresent()) {
170 try {
171 destRouterAddress = config.getRouterIpv4(nexthop.get().location().deviceId());
172 } catch (DeviceConfigNotFoundException e) {
173 log.warn("Device config not found. Abort ICMP processing");
174 return;
175 }
176 }
177 }
178
Pier Ventreadb4ae62016-11-23 09:57:42 -0800179 int destSid = config.getIPv4SegmentId(destRouterAddress);
Charles Chan70661362016-12-09 12:54:49 -0800180 if (destSid < 0) {
Charles Chanb8caeab2017-06-02 19:23:51 -0700181 log.warn("Failed to lookup SID of the switch that {} attaches to. " +
182 "Unable to process ICMP request.", destIpAddress);
sangho80f11cb2015-04-01 13:05:26 -0700183 return;
184 }
Pier Ventreb6b81d52016-12-02 08:16:05 -0800185 sendPacketOut(outport, icmpReplyEth, destSid, destIpAddress, icmpReplyIpv4.getTtl());
sangho80f11cb2015-04-01 13:05:26 -0700186 }
187
Pier Ventreb6b81d52016-12-02 08:16:05 -0800188 ///////////////////////////////////////////
189 // ICMPv6 Echo/Reply Protocol //
190 ///////////////////////////////////////////
sangho80f11cb2015-04-01 13:05:26 -0700191
Pier Ventreb6b81d52016-12-02 08:16:05 -0800192 /**
193 * Process incoming ICMPv6 packet.
Charles Chanb78b1132017-03-29 17:24:39 -0700194 * If it is an ICMPv6 request to router, then sends an ICMPv6 response.
195 * Otherwise ignore the packet.
Pier Ventreb6b81d52016-12-02 08:16:05 -0800196 *
197 * @param eth the incoming ICMPv6 packet
198 * @param inPort the input port
199 */
200 public void processIcmpv6(Ethernet eth, ConnectPoint inPort) {
201 DeviceId deviceId = inPort.deviceId();
202 IPv6 ipv6Packet = (IPv6) eth.getPayload();
203 Ip6Address destinationAddress = Ip6Address.valueOf(ipv6Packet.getDestinationAddress());
204 Set<IpAddress> gatewayIpAddresses = config.getPortIPs(deviceId);
205 IpAddress routerIp;
206 try {
207 routerIp = config.getRouterIpv6(deviceId);
208 } catch (DeviceConfigNotFoundException e) {
209 log.warn(e.getMessage() + " Aborting processPacketIn.");
210 return;
sangho80f11cb2015-04-01 13:05:26 -0700211 }
Pier Ventreb6b81d52016-12-02 08:16:05 -0800212 ICMP6 icmp6 = (ICMP6) ipv6Packet.getPayload();
213 // ICMP to the router IP or gateway IP
214 if (icmp6.getIcmpType() == ICMP6.ECHO_REQUEST &&
215 (destinationAddress.equals(routerIp.getIp6Address()) ||
216 gatewayIpAddresses.contains(destinationAddress))) {
217 sendIcmpv6Response(eth, inPort);
Pier Ventreb6b81d52016-12-02 08:16:05 -0800218 } else {
Charles Chanb78b1132017-03-29 17:24:39 -0700219 log.trace("Ignore ICMPv6 that targets for {}", destinationAddress);
Pier Ventreb6b81d52016-12-02 08:16:05 -0800220 }
221 }
222
223 /**
224 * Sends an ICMPv6 reply message.
225 *
226 * Note: we assume that packets sending from the edge switches to the hosts
227 * have untagged VLAN.
228 * @param ethRequest the original ICMP request
229 * @param outport the output port where the ICMP reply should be sent to
230 */
231 private void sendIcmpv6Response(Ethernet ethRequest, ConnectPoint outport) {
Charles Chanb8caeab2017-06-02 19:23:51 -0700232 // Note: We assume that packets arrive at the edge switches have untagged VLAN.
Pier Ventreb6b81d52016-12-02 08:16:05 -0800233 Ethernet ethReply = ICMP6.buildIcmp6Reply(ethRequest);
234 IPv6 icmpRequestIpv6 = (IPv6) ethRequest.getPayload();
235 IPv6 icmpReplyIpv6 = (IPv6) ethRequest.getPayload();
236 Ip6Address destIpAddress = Ip6Address.valueOf(icmpRequestIpv6.getSourceAddress());
237 Ip6Address destRouterAddress = config.getRouterIpAddressForASubnetHost(destIpAddress);
Charles Chanb8caeab2017-06-02 19:23:51 -0700238
239 // Note: Source IP of the ICMP request doesn't belong to any configured subnet.
240 // The source might be an indirect host behind a router.
241 // Lookup the route store for the nexthop instead.
242 if (destRouterAddress == null) {
243 Optional<ResolvedRoute> nexthop = srManager.routeService.longestPrefixLookup(destIpAddress);
244 if (nexthop.isPresent()) {
245 try {
246 destRouterAddress = config.getRouterIpv6(nexthop.get().location().deviceId());
247 } catch (DeviceConfigNotFoundException e) {
248 log.warn("Device config not found. Abort ICMPv6 processing");
249 return;
250 }
251 }
252 }
253
Pier Ventreb6b81d52016-12-02 08:16:05 -0800254 int sid = config.getIPv6SegmentId(destRouterAddress);
255 if (sid < 0) {
Charles Chanb8caeab2017-06-02 19:23:51 -0700256 log.warn("Failed to lookup SID of the switch that {} attaches to. " +
257 "Unable to process ICMPv6 request.", destIpAddress);
Pier Ventreb6b81d52016-12-02 08:16:05 -0800258 return;
259 }
260 sendPacketOut(outport, ethReply, sid, destIpAddress, icmpReplyIpv6.getHopLimit());
sangho80f11cb2015-04-01 13:05:26 -0700261 }
sangho9b169e32015-04-14 16:27:13 -0700262
Pier Ventre1a655962016-11-28 16:48:06 -0800263 ///////////////////////////////////////////
264 // ICMPv6 Neighbour Discovery Protocol //
265 ///////////////////////////////////////////
sangho9b169e32015-04-14 16:27:13 -0700266
Pier Ventre1a655962016-11-28 16:48:06 -0800267 /**
268 * Process incoming NDP packet.
269 *
270 * If it is an NDP request for the router or for the gateway, then sends a NDP reply.
271 * If it is an NDP request to unknown host flood in the subnet.
272 * If it is an NDP packet to known host forward the packet to the host.
273 *
274 * FIXME If the NDP packets use link local addresses we fail.
275 *
276 * @param pkt inbound packet
277 * @param hostService the host service
278 */
279 public void processPacketIn(NeighbourMessageContext pkt, HostService hostService) {
Charles Chanb78b1132017-03-29 17:24:39 -0700280 // First we validate the ndp packet
Pier Ventre1a655962016-11-28 16:48:06 -0800281 SegmentRoutingAppConfig appConfig = srManager.cfgService
282 .getConfig(srManager.appId, SegmentRoutingAppConfig.class);
283 if (appConfig != null && appConfig.suppressSubnet().contains(pkt.inPort())) {
284 // Ignore NDP packets come from suppressed ports
285 pkt.drop();
286 return;
287 }
Pier Ventre1a655962016-11-28 16:48:06 -0800288
289 if (pkt.type() == NeighbourMessageType.REQUEST) {
290 handleNdpRequest(pkt, hostService);
291 } else {
292 handleNdpReply(pkt, hostService);
293 }
294
295 }
296
297 /**
Pier Ventre1a655962016-11-28 16:48:06 -0800298 * Helper method to handle the ndp requests.
299 *
300 * @param pkt the ndp packet request and context information
301 * @param hostService the host service
302 */
303 private void handleNdpRequest(NeighbourMessageContext pkt, HostService hostService) {
Charles Chanb3016ed2017-02-27 15:50:43 -0800304 // ND request for the gateway. We have to reply on behalf of the gateway.
Pier Ventre1a655962016-11-28 16:48:06 -0800305 if (isNdpForGateway(pkt)) {
Saurav Das2cb38292017-03-29 19:09:17 -0700306 log.trace("Sending NDP reply on behalf of gateway IP for pkt: {}", pkt);
Pier Ventreb6b81d52016-12-02 08:16:05 -0800307 sendResponse(pkt, config.getRouterMacForAGatewayIp(pkt.target()), hostService);
Pier Ventre1a655962016-11-28 16:48:06 -0800308 } else {
Charles Chanb3016ed2017-02-27 15:50:43 -0800309 // NOTE: Ignore NDP packets except those target for the router
310 // We will reconsider enabling this when we have host learning support
Pier Ventre1a655962016-11-28 16:48:06 -0800311 /*
Charles Chanb3016ed2017-02-27 15:50:43 -0800312 // ND request for an host. We do a search by Ip.
Pier Ventre1a655962016-11-28 16:48:06 -0800313 Set<Host> hosts = hostService.getHostsByIp(pkt.target());
Charles Chanb3016ed2017-02-27 15:50:43 -0800314 // Possible misconfiguration ? In future this case
315 // should be handled we can have same hosts in different VLANs.
Pier Ventre1a655962016-11-28 16:48:06 -0800316 if (hosts.size() > 1) {
317 log.warn("More than one host with IP {}", pkt.target());
318 }
319 Host targetHost = hosts.stream().findFirst().orElse(null);
Charles Chanb3016ed2017-02-27 15:50:43 -0800320 // If we know the host forward to its attachment point.
Pier Ventre1a655962016-11-28 16:48:06 -0800321 if (targetHost != null) {
322 log.debug("Forward NDP request to the target host");
323 pkt.forward(targetHost.location());
324 } else {
Charles Chanb3016ed2017-02-27 15:50:43 -0800325 // Flood otherwise.
Pier Ventre1a655962016-11-28 16:48:06 -0800326 log.debug("Flood NDP request to the target subnet");
327 flood(pkt);
328 }
Charles Chanb3016ed2017-02-27 15:50:43 -0800329 */
Pier Ventre1a655962016-11-28 16:48:06 -0800330 }
331 }
332
333 /**
334 * Helper method to handle the ndp replies.
335 *
336 * @param pkt the ndp packet reply and context information
337 * @param hostService the host service
338 */
339 private void handleNdpReply(NeighbourMessageContext pkt, HostService hostService) {
340 if (isNdpForGateway(pkt)) {
341 log.debug("Forwarding all the ip packets we stored");
342 Ip6Address hostIpAddress = pkt.sender().getIp6Address();
343 srManager.ipHandler.forwardPackets(pkt.inPort().deviceId(), hostIpAddress);
344 } else {
Charles Chanb3016ed2017-02-27 15:50:43 -0800345 // NOTE: Ignore NDP packets except those target for the router
346 // We will reconsider enabling this when we have host learning support
347 /*
Pier Ventre1a655962016-11-28 16:48:06 -0800348 HostId hostId = HostId.hostId(pkt.dstMac(), pkt.vlan());
349 Host targetHost = hostService.getHost(hostId);
350 if (targetHost != null) {
351 log.debug("Forwarding the reply to the host");
352 pkt.forward(targetHost.location());
353 } else {
Charles Chanb3016ed2017-02-27 15:50:43 -0800354 // We don't have to flood towards spine facing ports.
Charles Chan10b0fb72017-02-02 16:20:42 -0800355 if (pkt.vlan().equals(SegmentRoutingManager.INTERNAL_VLAN)) {
Pier Ventre1a655962016-11-28 16:48:06 -0800356 return;
357 }
358 log.debug("Flooding the reply to the subnet");
359 flood(pkt);
360 }
Charles Chanb3016ed2017-02-27 15:50:43 -0800361 */
Pier Ventre1a655962016-11-28 16:48:06 -0800362 }
363 }
364
365 /**
366 * Utility to verify if the ND are for the gateway.
367 *
368 * @param pkt the ndp packet
369 * @return true if the ndp is for the gateway. False otherwise
370 */
371 private boolean isNdpForGateway(NeighbourMessageContext pkt) {
372 DeviceId deviceId = pkt.inPort().deviceId();
373 Set<IpAddress> gatewayIpAddresses = null;
374 try {
375 if (pkt.target().equals(config.getRouterIpv6(deviceId))) {
376 return true;
377 }
378 gatewayIpAddresses = config.getPortIPs(deviceId);
379 } catch (DeviceConfigNotFoundException e) {
380 log.warn(e.getMessage() + " Aborting check for router IP in processing ndp");
381 }
Charles Chand3727b72017-03-13 13:10:30 -0700382
383 return gatewayIpAddresses != null && gatewayIpAddresses.stream()
384 .filter(IpAddress::isIp6)
385 .anyMatch(gatewayIp -> gatewayIp.equals(pkt.target()) ||
386 Arrays.equals(IPv6.getSolicitNodeAddress(gatewayIp.toOctets()),
387 pkt.target().toOctets())
388 );
Pier Ventre1a655962016-11-28 16:48:06 -0800389 }
390
391 /**
Pier Ventreb6b81d52016-12-02 08:16:05 -0800392 * Sends a NDP request for the target IP address to all ports except in-port.
Pier Ventre1a655962016-11-28 16:48:06 -0800393 *
Pier Ventreb6b81d52016-12-02 08:16:05 -0800394 * @param deviceId Switch device ID
395 * @param targetAddress target IP address for ARP
396 * @param inPort in-port
Pier Ventre1a655962016-11-28 16:48:06 -0800397 */
Pier Ventreb6b81d52016-12-02 08:16:05 -0800398 public void sendNdpRequest(DeviceId deviceId, IpAddress targetAddress, ConnectPoint inPort) {
399 byte[] senderMacAddress = new byte[MacAddress.MAC_ADDRESS_LENGTH];
400 byte[] senderIpAddress = new byte[Ip6Address.BYTE_LENGTH];
Charles Chanb78b1132017-03-29 17:24:39 -0700401 // Retrieves device info.
Pier Luigi6a83c4a2017-01-29 12:38:48 -0800402 if (!getSenderInfo(senderMacAddress, senderIpAddress, deviceId, targetAddress)) {
403 log.warn("Aborting sendNdpRequest, we cannot get all the information needed");
404 return;
405 }
Charles Chanb78b1132017-03-29 17:24:39 -0700406 // We have to compute the dst mac address and dst ip address.
Pier Ventreb6b81d52016-12-02 08:16:05 -0800407 byte[] dstIp = IPv6.getSolicitNodeAddress(targetAddress.toOctets());
408 byte[] dstMac = IPv6.getMCastMacAddress(dstIp);
Charles Chanb78b1132017-03-29 17:24:39 -0700409 // Creates the request.
Pier Ventreb6b81d52016-12-02 08:16:05 -0800410 Ethernet ndpRequest = NeighborSolicitation.buildNdpSolicit(
411 targetAddress.toOctets(),
412 senderIpAddress,
413 dstIp,
414 senderMacAddress,
415 dstMac,
416 VlanId.NONE
417 );
418 flood(ndpRequest, inPort, targetAddress);
Pier Ventre1a655962016-11-28 16:48:06 -0800419 }
sangho80f11cb2015-04-01 13:05:26 -0700420}