datapath-windows/ovsext/Vxlan.c

   1 /*
   2  * Copyright (c) 2014 VMware, Inc.
   3  *
   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  */
  16
  17 #include "precomp.h"
  18 #include "Atomic.h"
  19 #include "NetProto.h"
  20 #include "Switch.h"
  21 #include "Vport.h"
  22 #include "Flow.h"
  23 #include "Vxlan.h"
  24 #include "IpHelper.h"
  25 #include "Checksum.h"
  26 #include "User.h"
  27 #include "PacketIO.h"
  28 #include "Flow.h"
  29 #include "PacketParser.h"
  30
  31 #pragma warning( push )
  32 #pragma warning( disable:4127 )
  33
  34
  35 #ifdef OVS_DBG_MOD
  36 #undef OVS_DBG_MOD
  37 #endif
  38 #define OVS_DBG_MOD OVS_DBG_VXLAN
  39 #include "Debug.h"
  40
  41 /* Helper macro to check if a VXLAN ID is valid. */
  42 #define VXLAN_ID_IS_VALID(vxlanID) (0 < (vxlanID) && (vxlanID) <= 0xffffff)
  43 #define VXLAN_TUNNELID_TO_VNI(_tID)   (UINT32)(((UINT64)(_tID)) >> 40)
  44 #define VXLAN_VNI_TO_TUNNELID(_vni) (((UINT64)(_vni)) << 40)
  45 #define IP_DF_NBO 0x0040
  46 #define VXLAN_DEFAULT_TTL 64
  47 #define VXLAN_MULTICAST_TTL 64
  48 #define VXLAN_DEFAULT_INSTANCE_ID 1
  49
  50 /* Move to a header file */
  51 extern POVS_SWITCH_CONTEXT gOvsSwitchContext;
  52
  53 /*
  54  *----------------------------------------------------------------------------
  55  * This function verifies if the VXLAN tunnel already exists, in order to
  56  * avoid sending a duplicate request to the WFP base filtering engine.
  57  *----------------------------------------------------------------------------
  58  */
  59 static BOOLEAN
  60 OvsIsTunnelFilterCreated(POVS_SWITCH_CONTEXT switchContext,
  61                          UINT16 udpPortDest)
  62 {
  63     for (UINT hash = 0; hash < OVS_MAX_VPORT_ARRAY_SIZE; hash++) {
  64         PLIST_ENTRY head, link, next;
  65
  66         head = &(switchContext->portNoHashArray[hash & OVS_VPORT_MASK]);
  67         LIST_FORALL_SAFE(head, link, next) {
  68             POVS_VPORT_ENTRY vport = NULL;
  69             POVS_VXLAN_VPORT vxlanPort = NULL;
  70             vport = CONTAINING_RECORD(link, OVS_VPORT_ENTRY, portNoLink);
  71             vxlanPort = (POVS_VXLAN_VPORT)vport->priv;
  72             if (vxlanPort) {
  73                 if ((udpPortDest == vxlanPort->dstPort)) {
  74                     /* The VXLAN tunnel was already created. */
  75                     return TRUE;
  76                 }
  77             }
  78         }
  79     }
  80
  81     return FALSE;
  82 }
  83
  84 /*
  85  *----------------------------------------------------------------------------
  86  * This function allocates and initializes the OVS_VXLAN_VPORT. The function
  87  * also creates a WFP tunnel filter for the necessary destination port. The
  88  * tunnel filter create request is passed to the tunnel filter threads that
  89  * will complete the request at a later time when IRQL is lowered to
  90  * PASSIVE_LEVEL.
  91  *
  92  * udpDestPort: the vxlan is set as payload to a udp frame. If the destination
  93  * port of an udp frame is udpDestPort, we understand it to be vxlan.
  94  *----------------------------------------------------------------------------
  95  */
  96 NTSTATUS
  97 OvsInitVxlanTunnel(PIRP irp,
  98                    POVS_VPORT_ENTRY vport,
  99                    UINT16 udpDestPort,
 100                    PFNTunnelVportPendingOp callback,
 101                    PVOID tunnelContext)
 102 {
 103     NTSTATUS status = STATUS_SUCCESS;
 104     POVS_VXLAN_VPORT vxlanPort = NULL;
 105
 106     vxlanPort = OvsAllocateMemoryWithTag(sizeof (*vxlanPort),
 107                                          OVS_VXLAN_POOL_TAG);
 108     if (vxlanPort == NULL) {
 109         return STATUS_INSUFFICIENT_RESOURCES;
 110     }
 111
 112     RtlZeroMemory(vxlanPort, sizeof(*vxlanPort));
 113     vxlanPort->dstPort = udpDestPort;
 114     vport->priv = (PVOID)vxlanPort;
 115
 116     if (!OvsIsTunnelFilterCreated(gOvsSwitchContext, udpDestPort)) {
 117         status = OvsTunnelFilterCreate(irp,
 118                                        udpDestPort,
 119                                        &vxlanPort->filterID,
 120                                        callback,
 121                                        tunnelContext);
 122     } else {
 123         status = STATUS_OBJECT_NAME_EXISTS;
 124     }
 125
 126     return status;
 127 }
 128
 129 /*
 130  *----------------------------------------------------------------------------
 131  * This function releases the OVS_VXLAN_VPORT. The function also deletes the
 132  * WFP tunnel filter previously created. The tunnel filter delete request is
 133  * passed to the tunnel filter threads that will complete the request at a
 134  * later time when IRQL is lowered to PASSIVE_LEVEL.
 135  *----------------------------------------------------------------------------
 136  */
 137 NTSTATUS
 138 OvsCleanupVxlanTunnel(PIRP irp,
 139                       POVS_VPORT_ENTRY vport,
 140                       PFNTunnelVportPendingOp callback,
 141                       PVOID tunnelContext)
 142 {
 143     NTSTATUS status = STATUS_SUCCESS;
 144     POVS_VXLAN_VPORT vxlanPort = NULL;
 145
 146     if (vport->ovsType != OVS_VPORT_TYPE_VXLAN ||
 147         vport->priv == NULL) {
 148         return STATUS_SUCCESS;
 149     }
 150
 151     vxlanPort = (POVS_VXLAN_VPORT)vport->priv;
 152
 153     if (vxlanPort->filterID != 0) {
 154         status = OvsTunnelFilterDelete(irp,
 155                                        vxlanPort->filterID,
 156                                        callback,
 157                                        tunnelContext);
 158     } else {
 159         OvsFreeMemoryWithTag(vport->priv, OVS_VXLAN_POOL_TAG);
 160         vport->priv = NULL;
 161     }
 162
 163     return status;
 164 }
 165
 166
 167 /*
 168  *----------------------------------------------------------------------------
 169  * OvsDoEncapVxlan
 170  *     Encapsulates the packet.
 171  *----------------------------------------------------------------------------
 172  */
 173 static __inline NDIS_STATUS
 174 OvsDoEncapVxlan(POVS_VPORT_ENTRY vport,
 175                 PNET_BUFFER_LIST curNbl,
 176                 OvsIPv4TunnelKey *tunKey,
 177                 POVS_FWD_INFO fwdInfo,
 178                 POVS_PACKET_HDR_INFO layers,
 179                 POVS_SWITCH_CONTEXT switchContext,
 180                 PNET_BUFFER_LIST *newNbl)
 181 {
 182     NDIS_STATUS status;
 183     PNET_BUFFER curNb;
 184     PMDL curMdl;
 185     PUINT8 bufferStart;
 186     EthHdr *ethHdr;
 187     IPHdr *ipHdr;
 188     UDPHdr *udpHdr;
 189     VXLANHdr *vxlanHdr;
 190     POVS_VXLAN_VPORT vportVxlan;
 191     UINT32 headRoom = OvsGetVxlanTunHdrSize();
 192     UINT32 packetLength;
 193
 194     /*
 195      * XXX: the assumption currently is that the NBL is owned by OVS, and
 196      * headroom has already been allocated as part of allocating the NBL and
 197      * MDL.
 198      */
 199     curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
 200     packetLength = NET_BUFFER_DATA_LENGTH(curNb);
 201     if (layers->isTcp) {
 202         NDIS_TCP_LARGE_SEND_OFFLOAD_NET_BUFFER_LIST_INFO tsoInfo;
 203
 204         tsoInfo.Value = NET_BUFFER_LIST_INFO(curNbl,
 205                 TcpLargeSendNetBufferListInfo);
 206         OVS_LOG_TRACE("MSS %u packet len %u", tsoInfo.LsoV1Transmit.MSS, packetLength);
 207         if (tsoInfo.LsoV1Transmit.MSS) {
 208             OVS_LOG_TRACE("l4Offset %d", layers->l4Offset);
 209             *newNbl = OvsTcpSegmentNBL(switchContext, curNbl, layers,
 210                         tsoInfo.LsoV1Transmit.MSS, headRoom);
 211             if (*newNbl == NULL) {
 212                 OVS_LOG_ERROR("Unable to segment NBL");
 213                 return NDIS_STATUS_FAILURE;
 214             }
 215         }
 216     }
 217
 218     vportVxlan = (POVS_VXLAN_VPORT) GetOvsVportPriv(vport);
 219     ASSERT(vportVxlan);
 220
 221     /* If we didn't split the packet above, make a copy now */
 222     if (*newNbl == NULL) {
 223         *newNbl = OvsPartialCopyNBL(switchContext, curNbl, 0, headRoom,
 224                                     FALSE /*NBL info*/);
 225         if (*newNbl == NULL) {
 226             OVS_LOG_ERROR("Unable to copy NBL");
 227             return NDIS_STATUS_FAILURE;
 228         }
 229     }
 230
 231     curNbl = *newNbl;
 232     for (curNb = NET_BUFFER_LIST_FIRST_NB(curNbl); curNb != NULL;
 233             curNb = curNb->Next) {
 234         status = NdisRetreatNetBufferDataStart(curNb, headRoom, 0, NULL);
 235         if (status != NDIS_STATUS_SUCCESS) {
 236             goto ret_error;
 237         }
 238
 239         curMdl = NET_BUFFER_CURRENT_MDL(curNb);
 240         bufferStart = (PUINT8)MmGetSystemAddressForMdlSafe(curMdl, LowPagePriority);
 241         if (!bufferStart) {
 242             status = NDIS_STATUS_RESOURCES;
 243             goto ret_error;
 244         }
 245
 246         bufferStart += NET_BUFFER_CURRENT_MDL_OFFSET(curNb);
 247         if (NET_BUFFER_NEXT_NB(curNb)) {
 248             OVS_LOG_TRACE("nb length %u next %u", NET_BUFFER_DATA_LENGTH(curNb),
 249                           NET_BUFFER_DATA_LENGTH(curNb->Next));
 250         }
 251
 252         /* L2 header */
 253         ethHdr = (EthHdr *)bufferStart;
 254         ASSERT(((PCHAR)&fwdInfo->dstMacAddr + sizeof fwdInfo->dstMacAddr) ==
 255                (PCHAR)&fwdInfo->srcMacAddr);
 256         NdisMoveMemory(ethHdr->Destination, fwdInfo->dstMacAddr,
 257                        sizeof ethHdr->Destination + sizeof ethHdr->Source);
 258         ethHdr->Type = htons(ETH_TYPE_IPV4);
 259
 260         // XXX: question: there are fields in the OvsIPv4TunnelKey for ttl and such,
 261         // should we use those values instead? or will they end up being
 262         // uninitialized;
 263         /* IP header */
 264         ipHdr = (IPHdr *)((PCHAR)ethHdr + sizeof *ethHdr);
 265
 266         ipHdr->ihl = sizeof *ipHdr / 4;
 267         ipHdr->version = IPPROTO_IPV4;
 268         ipHdr->tos = tunKey->tos;
 269         ipHdr->tot_len = htons(NET_BUFFER_DATA_LENGTH(curNb) - sizeof *ethHdr);
 270         ipHdr->id = (uint16)atomic_add64(&vportVxlan->ipId,
 271                                          NET_BUFFER_DATA_LENGTH(curNb));
 272         ipHdr->frag_off = (tunKey->flags & OVS_TNL_F_DONT_FRAGMENT) ?
 273                           IP_DF_NBO : 0;
 274         ipHdr->ttl = tunKey->ttl ? tunKey->ttl : VXLAN_DEFAULT_TTL;
 275         ipHdr->protocol = IPPROTO_UDP;
 276         ASSERT(tunKey->dst == fwdInfo->dstIpAddr);
 277         ASSERT(tunKey->src == fwdInfo->srcIpAddr || tunKey->src == 0);
 278         ipHdr->saddr = fwdInfo->srcIpAddr;
 279         ipHdr->daddr = fwdInfo->dstIpAddr;
 280         ipHdr->check = 0;
 281         ipHdr->check = IPChecksum((UINT8 *)ipHdr, sizeof *ipHdr, 0);
 282
 283         /* UDP header */
 284         udpHdr = (UDPHdr *)((PCHAR)ipHdr + sizeof *ipHdr);
 285         udpHdr->source = htons(tunKey->flow_hash | MAXINT16);
 286         udpHdr->dest = htons(vportVxlan->dstPort);
 287         udpHdr->len = htons(NET_BUFFER_DATA_LENGTH(curNb) - headRoom +
 288                             sizeof *udpHdr + sizeof *vxlanHdr);
 289         udpHdr->check = 0;
 290
 291         /* VXLAN header */
 292         vxlanHdr = (VXLANHdr *)((PCHAR)udpHdr + sizeof *udpHdr);
 293         vxlanHdr->flags1 = 0;
 294         vxlanHdr->locallyReplicate = 0;
 295         vxlanHdr->flags2 = 0;
 296         vxlanHdr->reserved1 = 0;
 297         if (tunKey->flags | OVS_TNL_F_KEY) {
 298             vxlanHdr->vxlanID = VXLAN_TUNNELID_TO_VNI(tunKey->tunnelId);
 299             vxlanHdr->instanceID = 1;
 300         }
 301         vxlanHdr->reserved2 = 0;
 302     }
 303     return STATUS_SUCCESS;
 304
 305 ret_error:
 306     OvsCompleteNBL(switchContext, *newNbl, TRUE);
 307     *newNbl = NULL;
 308     return status;
 309 }
 310
 311
 312 /*
 313  *----------------------------------------------------------------------------
 314  * OvsEncapVxlan --
 315  *     Encapsulates the packet if L2/L3 for destination resolves. Otherwise,
 316  *     enqueues a callback that does encapsulatation after resolution.
 317  *----------------------------------------------------------------------------
 318  */
 319 NDIS_STATUS
 320 OvsEncapVxlan(POVS_VPORT_ENTRY vport,
 321               PNET_BUFFER_LIST curNbl,
 322               OvsIPv4TunnelKey *tunKey,
 323               POVS_SWITCH_CONTEXT switchContext,
 324               POVS_PACKET_HDR_INFO layers,
 325               PNET_BUFFER_LIST *newNbl)
 326 {
 327     NTSTATUS status;
 328     OVS_FWD_INFO fwdInfo;
 329
 330     status = OvsLookupIPFwdInfo(tunKey->dst, &fwdInfo);
 331     if (status != STATUS_SUCCESS) {
 332         OvsFwdIPHelperRequest(NULL, 0, tunKey, NULL, NULL, NULL);
 333         // return NDIS_STATUS_PENDING;
 334         /*
 335          * XXX: Don't know if the completionList will make any sense when
 336          * accessed in the callback. Make sure the caveats are known.
 337          *
 338          * XXX: This code will work once we are able to grab locks in the
 339          * callback.
 340          */
 341         return NDIS_STATUS_FAILURE;
 342     }
 343
 344     return OvsDoEncapVxlan(vport, curNbl, tunKey, &fwdInfo, layers,
 345                            switchContext, newNbl);
 346 }
 347
 348 /*
 349  *----------------------------------------------------------------------------
 350  * OvsCalculateUDPChecksum
 351  *     Calculate UDP checksum
 352  *----------------------------------------------------------------------------
 353  */
 354 static __inline NDIS_STATUS
 355 OvsCalculateUDPChecksum(PNET_BUFFER_LIST curNbl,
 356                         PNET_BUFFER curNb,
 357                         IPHdr *ipHdr,
 358                         UDPHdr *udpHdr,
 359                         UINT32 packetLength)
 360 {
 361     NDIS_TCP_IP_CHECKSUM_NET_BUFFER_LIST_INFO csumInfo;
 362     UINT16 checkSum;
 363
 364     csumInfo.Value = NET_BUFFER_LIST_INFO(curNbl, TcpIpChecksumNetBufferListInfo);
 365
 366     /* Next check if UDP checksum has been calculated. */
 367     if (!csumInfo.Receive.UdpChecksumSucceeded) {
 368         UINT32 l4Payload;
 369
 370         checkSum = udpHdr->check;
 371
 372         l4Payload = packetLength - sizeof(EthHdr) - ipHdr->ihl * 4;
 373         udpHdr->check = 0;
 374         udpHdr->check =
 375             IPPseudoChecksum((UINT32 *)&ipHdr->saddr,
 376                              (UINT32 *)&ipHdr->daddr,
 377                              IPPROTO_UDP, (UINT16)l4Payload);
 378         udpHdr->check = CalculateChecksumNB(curNb, (UINT16)l4Payload,
 379             sizeof(EthHdr) + ipHdr->ihl * 4);
 380         if (checkSum != udpHdr->check) {
 381             OVS_LOG_TRACE("UDP checksum incorrect.");
 382             return NDIS_STATUS_INVALID_PACKET;
 383         }
 384     }
 385
 386     csumInfo.Receive.UdpChecksumSucceeded = 1;
 387     NET_BUFFER_LIST_INFO(curNbl, TcpIpChecksumNetBufferListInfo) = csumInfo.Value;
 388     return NDIS_STATUS_SUCCESS;
 389 }
 390
 391 /*
 392  *----------------------------------------------------------------------------
 393  * OvsDecapVxlan
 394  *     Decapsulates to tunnel header in 'curNbl' and puts into 'tunKey'.
 395  *----------------------------------------------------------------------------
 396  */
 397 NDIS_STATUS
 398 OvsDecapVxlan(POVS_SWITCH_CONTEXT switchContext,
 399               PNET_BUFFER_LIST curNbl,
 400               OvsIPv4TunnelKey *tunKey,
 401               PNET_BUFFER_LIST *newNbl)
 402 {
 403     PNET_BUFFER curNb;
 404     PMDL curMdl;
 405     EthHdr *ethHdr;
 406     IPHdr *ipHdr;
 407     UDPHdr *udpHdr;
 408     VXLANHdr *vxlanHdr;
 409     UINT32 tunnelSize = 0, packetLength = 0;
 410     PUINT8 bufferStart;
 411     NDIS_STATUS status;
 412
 413     /* Check the the length of the UDP payload */
 414     curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
 415     packetLength = NET_BUFFER_DATA_LENGTH(curNb);
 416     tunnelSize = OvsGetVxlanTunHdrSize();
 417     if (packetLength <= tunnelSize) {
 418         return NDIS_STATUS_INVALID_LENGTH;
 419     }
 420
 421     /*
 422      * Create a copy of the NBL so that we have all the headers in one MDL.
 423      */
 424     *newNbl = OvsPartialCopyNBL(switchContext, curNbl,
 425                                 tunnelSize + OVS_DEFAULT_COPY_SIZE, 0,
 426                                 TRUE /*copy NBL info */);
 427
 428     if (*newNbl == NULL) {
 429         return NDIS_STATUS_RESOURCES;
 430     }
 431
 432     /* XXX: Handle VLAN header. */
 433     curNbl = *newNbl;
 434     curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
 435     curMdl = NET_BUFFER_CURRENT_MDL(curNb);
 436     bufferStart = (PUINT8)MmGetSystemAddressForMdlSafe(curMdl, LowPagePriority) +
 437                   NET_BUFFER_CURRENT_MDL_OFFSET(curNb);
 438     if (!bufferStart) {
 439         status = NDIS_STATUS_RESOURCES;
 440         goto dropNbl;
 441     }
 442
 443     ethHdr = (EthHdr *)bufferStart;
 444     /* XXX: Handle IP options. */
 445     ipHdr = (IPHdr *)((PCHAR)ethHdr + sizeof *ethHdr);
 446     tunKey->src = ipHdr->saddr;
 447     tunKey->dst = ipHdr->daddr;
 448     tunKey->tos = ipHdr->tos;
 449     tunKey->ttl = ipHdr->ttl;
 450     tunKey->pad = 0;
 451     udpHdr = (UDPHdr *)((PCHAR)ipHdr + sizeof *ipHdr);
 452
 453     /* Validate if NIC has indicated checksum failure. */
 454     status = OvsValidateUDPChecksum(curNbl, udpHdr->check == 0);
 455     if (status != NDIS_STATUS_SUCCESS) {
 456         goto dropNbl;
 457     }
 458
 459     /* Calculate and verify UDP checksum if NIC didn't do it. */
 460     if (udpHdr->check != 0) {
 461         status = OvsCalculateUDPChecksum(curNbl, curNb, ipHdr, udpHdr, packetLength);
 462         if (status != NDIS_STATUS_SUCCESS) {
 463             goto dropNbl;
 464         }
 465     }
 466
 467     vxlanHdr = (VXLANHdr *)((PCHAR)udpHdr + sizeof *udpHdr);
 468     if (vxlanHdr->instanceID) {
 469         tunKey->flags = OVS_TNL_F_KEY;
 470         tunKey->tunnelId = VXLAN_VNI_TO_TUNNELID(vxlanHdr->vxlanID);
 471     } else {
 472         tunKey->flags = 0;
 473         tunKey->tunnelId = 0;
 474     }
 475
 476     /* Clear out the receive flag for the inner packet. */
 477     NET_BUFFER_LIST_INFO(curNbl, TcpIpChecksumNetBufferListInfo) = 0;
 478     NdisAdvanceNetBufferDataStart(curNb, tunnelSize, FALSE, NULL);
 479     return NDIS_STATUS_SUCCESS;
 480
 481 dropNbl:
 482     OvsCompleteNBL(switchContext, *newNbl, TRUE);
 483     *newNbl = NULL;
 484     return status;
 485 }
 486
 487
 488 NDIS_STATUS
 489 OvsSlowPathDecapVxlan(const PNET_BUFFER_LIST packet,
 490                    OvsIPv4TunnelKey *tunnelKey)
 491 {
 492     NDIS_STATUS status = NDIS_STATUS_FAILURE;
 493     UDPHdr udpStorage;
 494     const UDPHdr *udp;
 495     VXLANHdr *VxlanHeader;
 496     VXLANHdr  VxlanHeaderBuffer;
 497     struct IPHdr ip_storage;
 498     const struct IPHdr *nh;
 499     OVS_PACKET_HDR_INFO layers;
 500
 501     layers.value = 0;
 502
 503     do {
 504         nh = OvsGetIp(packet, layers.l3Offset, &ip_storage);
 505         if (nh) {
 506             layers.l4Offset = layers.l3Offset + nh->ihl * 4;
 507         } else {
 508             break;
 509         }
 510
 511         /* make sure it's a VXLAN packet */
 512         udp = OvsGetUdp(packet, layers.l4Offset, &udpStorage);
 513         if (udp) {
 514             layers.l7Offset = layers.l4Offset + sizeof *udp;
 515         } else {
 516             break;
 517         }
 518
 519         VxlanHeader = (VXLANHdr *)OvsGetPacketBytes(packet,
 520                                                     sizeof(*VxlanHeader),
 521                                                     layers.l7Offset,
 522                                                     &VxlanHeaderBuffer);
 523
 524         if (VxlanHeader) {
 525             tunnelKey->src = nh->saddr;
 526             tunnelKey->dst = nh->daddr;
 527             tunnelKey->ttl = nh->ttl;
 528             tunnelKey->tos = nh->tos;
 529             if (VxlanHeader->instanceID) {
 530                 tunnelKey->flags = OVS_TNL_F_KEY;
 531                 tunnelKey->tunnelId = VXLAN_VNI_TO_TUNNELID(VxlanHeader->vxlanID);
 532             } else {
 533                 tunnelKey->flags = 0;
 534                 tunnelKey->tunnelId = 0;
 535             }
 536         } else {
 537             break;
 538         }
 539         status = NDIS_STATUS_SUCCESS;
 540
 541     } while(FALSE);
 542
 543     return status;
 544 }
 545
 546 #pragma warning( pop )