source3/smbd/smb2_ioctl_network_fs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) David Disseldorp 2012
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../libcli/security/security.h"
  27 #include "../lib/util/tevent_ntstatus.h"
  28 #include "include/ntioctl.h"
  29 #include "../librpc/ndr/libndr.h"
  30 #include "librpc/gen_ndr/ndr_ioctl.h"
  31 #include "smb2_ioctl_private.h"
  32
  33 #define COPYCHUNK_MAX_CHUNKS    256             /* 2k8r2 & win8 = 256 */
  34 #define COPYCHUNK_MAX_CHUNK_LEN 1048576         /* 2k8r2 & win8 = 1048576 */
  35 #define COPYCHUNK_MAX_TOTAL_LEN 16777216        /* 2k8r2 & win8 = 16777216 */
  36 static void copychunk_pack_limits(struct srv_copychunk_rsp *cc_rsp)
  37 {
  38         cc_rsp->chunks_written = COPYCHUNK_MAX_CHUNKS;
  39         cc_rsp->chunk_bytes_written = COPYCHUNK_MAX_CHUNK_LEN;
  40         cc_rsp->total_bytes_written = COPYCHUNK_MAX_TOTAL_LEN;
  41 }
  42
  43 static NTSTATUS copychunk_check_limits(struct srv_copychunk_copy *cc_copy)
  44 {
  45         uint32_t i;
  46         uint32_t total_len = 0;
  47
  48         /*
  49          * [MS-SMB2] 3.3.5.15.6 Handling a Server-Side Data Copy Request
  50          * Send and invalid parameter response if:
  51          * - The ChunkCount value is greater than
  52          *   ServerSideCopyMaxNumberofChunks
  53          */
  54         if (cc_copy->chunk_count > COPYCHUNK_MAX_CHUNKS) {
  55                 return NT_STATUS_INVALID_PARAMETER;
  56         }
  57
  58         for (i = 0; i < cc_copy->chunk_count; i++) {
  59                 /*
  60                  * - The Length value in a single chunk is greater than
  61                  *   ServerSideCopyMaxChunkSize or equal to zero.
  62                  */
  63                 if ((cc_copy->chunks[i].length == 0)
  64                  || (cc_copy->chunks[i].length > COPYCHUNK_MAX_CHUNK_LEN)) {
  65                         return NT_STATUS_INVALID_PARAMETER;
  66                 }
  67                 total_len += cc_copy->chunks[i].length;
  68         }
  69         /*
  70          * - Sum of Lengths in all chunks is greater than
  71          *   ServerSideCopyMaxDataSize
  72          */
  73         if (total_len > COPYCHUNK_MAX_TOTAL_LEN) {
  74                 return NT_STATUS_INVALID_PARAMETER;
  75         }
  76
  77         return NT_STATUS_OK;
  78 }
  79
  80 struct fsctl_srv_copychunk_state {
  81         struct connection_struct *conn;
  82         uint32_t dispatch_count;
  83         uint32_t recv_count;
  84         uint32_t bad_recv_count;
  85         NTSTATUS status;
  86         off_t total_written;
  87         struct files_struct *src_fsp;
  88         struct files_struct *dst_fsp;
  89         enum {
  90                 COPYCHUNK_OUT_EMPTY = 0,
  91                 COPYCHUNK_OUT_LIMITS,
  92                 COPYCHUNK_OUT_RSP,
  93         } out_data;
  94 };
  95 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq);
  96
  97 static NTSTATUS copychunk_check_handles(uint32_t ctl_code,
  98                                         struct files_struct *src_fsp,
  99                                         struct files_struct *dst_fsp,
 100                                         struct smb_request *smb1req)
 101 {
 102         /*
 103          * [MS-SMB2] 3.3.5.15.6 Handling a Server-Side Data Copy Request
 104          * The server MUST fail the request with STATUS_ACCESS_DENIED if any of
 105          * the following are true:
 106          * - The Open.GrantedAccess of the destination file does not include
 107          *   FILE_WRITE_DATA or FILE_APPEND_DATA.
 108          */
 109         if (!CHECK_WRITE(dst_fsp)) {
 110                 DEBUG(5, ("copy chunk no write on dest handle (%s).\n",
 111                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 112                 return NT_STATUS_ACCESS_DENIED;
 113         }
 114         /*
 115          * - The Open.GrantedAccess of the destination file does not include
 116          *   FILE_READ_DATA, and the CtlCode is FSCTL_SRV_COPYCHUNK.
 117          */
 118         if ((ctl_code == FSCTL_SRV_COPYCHUNK)
 119           && !CHECK_READ(dst_fsp, smb1req)) {
 120                 DEBUG(5, ("copy chunk no read on dest handle (%s).\n",
 121                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 122                 return NT_STATUS_ACCESS_DENIED;
 123         }
 124         /*
 125          * - The Open.GrantedAccess of the source file does not include
 126          *   FILE_READ_DATA access.
 127          */
 128         if (!CHECK_READ(src_fsp, smb1req)) {
 129                 DEBUG(5, ("copy chunk no read on src handle (%s).\n",
 130                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 131                 return NT_STATUS_ACCESS_DENIED;
 132         }
 133
 134         if (src_fsp->is_directory) {
 135                 DEBUG(5, ("copy chunk no read on src directory handle (%s).\n",
 136                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 137                 return NT_STATUS_ACCESS_DENIED;
 138         }
 139
 140         if (dst_fsp->is_directory) {
 141                 DEBUG(5, ("copy chunk no read on dst directory handle (%s).\n",
 142                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 143                 return NT_STATUS_ACCESS_DENIED;
 144         }
 145
 146         if (IS_IPC(src_fsp->conn) || IS_IPC(dst_fsp->conn)) {
 147                 DEBUG(5, ("copy chunk no access on IPC$ handle.\n"));
 148                 return NT_STATUS_ACCESS_DENIED;
 149         }
 150
 151         if (IS_PRINT(src_fsp->conn) || IS_PRINT(dst_fsp->conn)) {
 152                 DEBUG(5, ("copy chunk no access on PRINT handle.\n"));
 153                 return NT_STATUS_ACCESS_DENIED;
 154         }
 155
 156         return NT_STATUS_OK;
 157 }
 158
 159 static struct tevent_req *fsctl_srv_copychunk_send(TALLOC_CTX *mem_ctx,
 160                                                    struct tevent_context *ev,
 161                                                    uint32_t ctl_code,
 162                                                    struct files_struct *dst_fsp,
 163                                                    DATA_BLOB *in_input,
 164                                                    size_t in_max_output,
 165                                                    struct smbd_smb2_request *smb2req)
 166 {
 167         struct tevent_req *req;
 168         struct srv_copychunk_copy cc_copy;
 169         enum ndr_err_code ndr_ret;
 170         uint64_t src_persistent_h;
 171         uint64_t src_volatile_h;
 172         int i;
 173         struct srv_copychunk *chunk;
 174         struct fsctl_srv_copychunk_state *state;
 175
 176         /* handler for both copy-chunk variants */
 177         SMB_ASSERT((ctl_code == FSCTL_SRV_COPYCHUNK)
 178                 || (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE));
 179
 180         req = tevent_req_create(mem_ctx, &state,
 181                                 struct fsctl_srv_copychunk_state);
 182         if (req == NULL) {
 183                 return NULL;
 184         }
 185         state->conn = dst_fsp->conn;
 186
 187         if (in_max_output < sizeof(struct srv_copychunk_rsp)) {
 188                 DEBUG(3, ("max output %d not large enough to hold copy chunk "
 189                           "response %lu\n", (int)in_max_output,
 190                           (unsigned long)sizeof(struct srv_copychunk_rsp)));
 191                 state->status = NT_STATUS_INVALID_PARAMETER;
 192                 tevent_req_nterror(req, state->status);
 193                 return tevent_req_post(req, ev);
 194         }
 195
 196         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cc_copy,
 197                         (ndr_pull_flags_fn_t)ndr_pull_srv_copychunk_copy);
 198         if (ndr_ret != NDR_ERR_SUCCESS) {
 199                 DEBUG(0, ("failed to unmarshall copy chunk req\n"));
 200                 state->status = NT_STATUS_INVALID_PARAMETER;
 201                 tevent_req_nterror(req, state->status);
 202                 return tevent_req_post(req, ev);
 203         }
 204
 205         /* persistent/volatile keys sent as the resume key */
 206         src_persistent_h = BVAL(cc_copy.source_key, 0);
 207         src_volatile_h = BVAL(cc_copy.source_key, 8);
 208         state->src_fsp = file_fsp_get(smb2req, src_persistent_h, src_volatile_h);
 209         if (state->src_fsp == NULL) {
 210                 DEBUG(3, ("invalid resume key in copy chunk req\n"));
 211                 state->status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 212                 tevent_req_nterror(req, state->status);
 213                 return tevent_req_post(req, ev);
 214         }
 215
 216         state->dst_fsp = dst_fsp;
 217
 218         state->status = copychunk_check_handles(ctl_code,
 219                                                 state->src_fsp,
 220                                                 state->dst_fsp,
 221                                                 smb2req->smb1req);
 222         if (!NT_STATUS_IS_OK(state->status)) {
 223                 tevent_req_nterror(req, state->status);
 224                 return tevent_req_post(req, ev);
 225         }
 226
 227         state->status = copychunk_check_limits(&cc_copy);
 228         if (tevent_req_nterror(req, state->status)) {
 229                 DEBUG(3, ("copy chunk req exceeds limits\n"));
 230                 state->out_data = COPYCHUNK_OUT_LIMITS;
 231                 return tevent_req_post(req, ev);
 232         }
 233
 234         /* any errors from here onwards should carry copychunk response data */
 235         state->out_data = COPYCHUNK_OUT_RSP;
 236
 237         for (i = 0; i < cc_copy.chunk_count; i++) {
 238                 struct tevent_req *vfs_subreq;
 239                 chunk = &cc_copy.chunks[i];
 240                 vfs_subreq = SMB_VFS_COPY_CHUNK_SEND(dst_fsp->conn,
 241                                                      state, ev,
 242                                                      state->src_fsp,
 243                                                      chunk->source_off,
 244                                                      state->dst_fsp,
 245                                                      chunk->target_off,
 246                                                      chunk->length);
 247                 if (vfs_subreq == NULL) {
 248                         DEBUG(0, ("VFS copy chunk send failed\n"));
 249                         state->status = NT_STATUS_NO_MEMORY;
 250                         if (state->dispatch_count == 0) {
 251                                 /* nothing dispatched, return immediately */
 252                                 tevent_req_nterror(req, state->status);
 253                                 return tevent_req_post(req, ev);
 254                         } else {
 255                                 /*
 256                                  * wait for dispatched to complete before
 257                                  * returning error.
 258                                  */
 259                                 break;
 260                         }
 261                 }
 262                 tevent_req_set_callback(vfs_subreq,
 263                                         fsctl_srv_copychunk_vfs_done, req);
 264                 state->dispatch_count++;
 265         }
 266
 267         return req;
 268 }
 269
 270 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq)
 271 {
 272         struct tevent_req *req = tevent_req_callback_data(
 273                 subreq, struct tevent_req);
 274         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 275                                         struct fsctl_srv_copychunk_state);
 276         off_t chunk_nwritten;
 277         NTSTATUS status;
 278
 279         state->recv_count++;
 280         status = SMB_VFS_COPY_CHUNK_RECV(state->conn, subreq,
 281                                          &chunk_nwritten);
 282         TALLOC_FREE(subreq);
 283         if (NT_STATUS_IS_OK(status)) {
 284                 DEBUG(10, ("good copy chunk recv %u of %u\n",
 285                            (unsigned int)state->recv_count,
 286                            (unsigned int)state->dispatch_count));
 287                 state->total_written += chunk_nwritten;
 288         } else {
 289                 DEBUG(0, ("bad status in copy chunk recv %u of %u: %s\n",
 290                           (unsigned int)state->recv_count,
 291                           (unsigned int)state->dispatch_count,
 292                           nt_errstr(status)));
 293                 state->bad_recv_count++;
 294                 /* may overwrite previous failed status */
 295                 state->status = status;
 296         }
 297
 298         if (state->recv_count != state->dispatch_count) {
 299                 /*
 300                  * Wait for all VFS copy_chunk requests to complete, even
 301                  * if an error is received for a specific chunk.
 302                  */
 303                 return;
 304         }
 305
 306         if (!tevent_req_nterror(req, state->status)) {
 307                 tevent_req_done(req);
 308         }
 309 }
 310
 311 static NTSTATUS fsctl_srv_copychunk_recv(struct tevent_req *req,
 312                                          struct srv_copychunk_rsp *cc_rsp,
 313                                          bool *pack_rsp)
 314 {
 315         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 316                                         struct fsctl_srv_copychunk_state);
 317         NTSTATUS status;
 318
 319         switch (state->out_data) {
 320         case COPYCHUNK_OUT_EMPTY:
 321                 *pack_rsp = false;
 322                 break;
 323         case COPYCHUNK_OUT_LIMITS:
 324                 /* 2.2.32.1 - send back our maximum transfer size limits */
 325                 copychunk_pack_limits(cc_rsp);
 326                 *pack_rsp = true;
 327                 break;
 328         case COPYCHUNK_OUT_RSP:
 329                 cc_rsp->chunks_written = state->recv_count - state->bad_recv_count;
 330                 cc_rsp->chunk_bytes_written = 0;
 331                 cc_rsp->total_bytes_written = state->total_written;
 332                 *pack_rsp = true;
 333                 break;
 334         default:        /* not reached */
 335                 assert(1);
 336                 break;
 337         }
 338         status = state->status;
 339         tevent_req_received(req);
 340
 341         return status;
 342 }
 343
 344 static NTSTATUS fsctl_validate_neg_info(TALLOC_CTX *mem_ctx,
 345                                         struct tevent_context *ev,
 346                                         struct smbXsrv_connection *conn,
 347                                         DATA_BLOB *in_input,
 348                                         uint32_t in_max_output,
 349                                         DATA_BLOB *out_output,
 350                                         bool *disconnect)
 351 {
 352         uint32_t in_capabilities;
 353         DATA_BLOB in_guid_blob;
 354         struct GUID in_guid;
 355         uint16_t in_security_mode;
 356         uint16_t in_num_dialects;
 357         uint16_t dialect;
 358         DATA_BLOB out_guid_blob;
 359         NTSTATUS status;
 360         enum protocol_types protocol = PROTOCOL_NONE;
 361
 362         if (in_input->length < 0x18) {
 363                 return NT_STATUS_INVALID_PARAMETER;
 364         }
 365
 366         in_capabilities = IVAL(in_input->data, 0x00);
 367         in_guid_blob = data_blob_const(in_input->data + 0x04, 16);
 368         in_security_mode = SVAL(in_input->data, 0x14);
 369         in_num_dialects = SVAL(in_input->data, 0x16);
 370
 371         if (in_input->length < (0x18 + in_num_dialects*2)) {
 372                 return NT_STATUS_INVALID_PARAMETER;
 373         }
 374
 375         if (in_max_output < 0x18) {
 376                 return NT_STATUS_BUFFER_TOO_SMALL;
 377         }
 378
 379         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 380         if (!NT_STATUS_IS_OK(status)) {
 381                 return status;
 382         }
 383
 384         /*
 385          * From: [MS-SMB2]
 386          * 3.3.5.15.12 Handling a Validate Negotiate Info Request
 387          *
 388          * The server MUST determine the greatest common dialect
 389          * between the dialects it implements and the Dialects array
 390          * of the VALIDATE_NEGOTIATE_INFO request. If no dialect is
 391          * matched, or if the value is not equal to Connection.Dialect,
 392          * the server MUST terminate the transport connection
 393          * and free the Connection object.
 394          */
 395         protocol = smbd_smb2_protocol_dialect_match(in_input->data + 0x18,
 396                                                     in_num_dialects,
 397                                                     &dialect);
 398         if (conn->protocol != protocol) {
 399                 *disconnect = true;
 400                 return NT_STATUS_ACCESS_DENIED;
 401         }
 402
 403         if (!GUID_equal(&in_guid, &conn->smb2.client.guid)) {
 404                 *disconnect = true;
 405                 return NT_STATUS_ACCESS_DENIED;
 406         }
 407
 408         if (in_security_mode != conn->smb2.client.security_mode) {
 409                 *disconnect = true;
 410                 return NT_STATUS_ACCESS_DENIED;
 411         }
 412
 413         if (in_capabilities != conn->smb2.client.capabilities) {
 414                 *disconnect = true;
 415                 return NT_STATUS_ACCESS_DENIED;
 416         }
 417
 418         status = GUID_to_ndr_blob(&conn->smb2.server.guid, mem_ctx,
 419                                   &out_guid_blob);
 420         if (!NT_STATUS_IS_OK(status)) {
 421                 return status;
 422         }
 423
 424         *out_output = data_blob_talloc(mem_ctx, NULL, 0x18);
 425         if (out_output->data == NULL) {
 426                 return NT_STATUS_NO_MEMORY;
 427         }
 428
 429         SIVAL(out_output->data, 0x00, conn->smb2.server.capabilities);
 430         memcpy(out_output->data+0x04, out_guid_blob.data, 16);
 431         SSVAL(out_output->data, 0x14, conn->smb2.server.security_mode);
 432         SSVAL(out_output->data, 0x16, conn->smb2.server.dialect);
 433
 434         return NT_STATUS_OK;
 435 }
 436
 437 static NTSTATUS fsctl_srv_req_resume_key(TALLOC_CTX *mem_ctx,
 438                                          struct tevent_context *ev,
 439                                          struct files_struct *fsp,
 440                                          uint32_t in_max_output,
 441                                          DATA_BLOB *out_output)
 442 {
 443         struct req_resume_key_rsp rkey_rsp;
 444         enum ndr_err_code ndr_ret;
 445         DATA_BLOB output;
 446
 447         if (fsp == NULL) {
 448                 return NT_STATUS_FILE_CLOSED;
 449         }
 450
 451         ZERO_STRUCT(rkey_rsp);
 452         /* combine persistent and volatile handles for the resume key */
 453         SBVAL(rkey_rsp.resume_key, 0, fsp->op->global->open_persistent_id);
 454         SBVAL(rkey_rsp.resume_key, 8, fsp->op->global->open_volatile_id);
 455
 456         ndr_ret = ndr_push_struct_blob(&output, mem_ctx, &rkey_rsp,
 457                         (ndr_push_flags_fn_t)ndr_push_req_resume_key_rsp);
 458         if (ndr_ret != NDR_ERR_SUCCESS) {
 459                 return NT_STATUS_INTERNAL_ERROR;
 460         }
 461
 462         if (in_max_output < output.length) {
 463                 DEBUG(1, ("max output %u too small for resume key rsp %ld\n",
 464                           (unsigned int)in_max_output, (long int)output.length));
 465                 return NT_STATUS_INVALID_PARAMETER;
 466         }
 467         *out_output = output;
 468
 469         return NT_STATUS_OK;
 470 }
 471
 472 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq);
 473
 474 struct tevent_req *smb2_ioctl_network_fs(uint32_t ctl_code,
 475                                          struct tevent_context *ev,
 476                                          struct tevent_req *req,
 477                                          struct smbd_smb2_ioctl_state *state)
 478 {
 479         struct tevent_req *subreq;
 480         NTSTATUS status;
 481
 482         switch (ctl_code) {
 483         /*
 484          * [MS-SMB2] 2.2.31
 485          * FSCTL_SRV_COPYCHUNK is issued when a handle has
 486          * FILE_READ_DATA and FILE_WRITE_DATA access to the file;
 487          * FSCTL_SRV_COPYCHUNK_WRITE is issued when a handle only has
 488          * FILE_WRITE_DATA access.
 489          */
 490         case FSCTL_SRV_COPYCHUNK_WRITE: /* FALL THROUGH */
 491         case FSCTL_SRV_COPYCHUNK:
 492                 subreq = fsctl_srv_copychunk_send(state, ev,
 493                                                   ctl_code,
 494                                                   state->fsp,
 495                                                   &state->in_input,
 496                                                   state->in_max_output,
 497                                                   state->smb2req);
 498                 if (tevent_req_nomem(subreq, req)) {
 499                         return tevent_req_post(req, ev);
 500                 }
 501                 tevent_req_set_callback(subreq,
 502                                         smb2_ioctl_network_fs_copychunk_done,
 503                                         req);
 504                 return req;
 505                 break;
 506         case FSCTL_VALIDATE_NEGOTIATE_INFO:
 507                 status = fsctl_validate_neg_info(state, ev,
 508                                                  state->smbreq->xconn,
 509                                                  &state->in_input,
 510                                                  state->in_max_output,
 511                                                  &state->out_output,
 512                                                  &state->disconnect);
 513                 if (!tevent_req_nterror(req, status)) {
 514                         tevent_req_done(req);
 515                 }
 516                 return tevent_req_post(req, ev);
 517                 break;
 518         case FSCTL_SRV_REQUEST_RESUME_KEY:
 519                 status = fsctl_srv_req_resume_key(state, ev, state->fsp,
 520                                                   state->in_max_output,
 521                                                   &state->out_output);
 522                 if (!tevent_req_nterror(req, status)) {
 523                         tevent_req_done(req);
 524                 }
 525                 return tevent_req_post(req, ev);
 526                 break;
 527         default: {
 528                 uint8_t *out_data = NULL;
 529                 uint32_t out_data_len = 0;
 530
 531                 if (state->fsp == NULL) {
 532                         status = NT_STATUS_NOT_SUPPORTED;
 533                 } else {
 534                         status = SMB_VFS_FSCTL(state->fsp,
 535                                                state,
 536                                                ctl_code,
 537                                                state->smbreq->flags2,
 538                                                state->in_input.data,
 539                                                state->in_input.length,
 540                                                &out_data,
 541                                                state->in_max_output,
 542                                                &out_data_len);
 543                         state->out_output = data_blob_const(out_data, out_data_len);
 544                         if (NT_STATUS_IS_OK(status)) {
 545                                 tevent_req_done(req);
 546                                 return tevent_req_post(req, ev);
 547                         }
 548                 }
 549
 550                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 551                         if (IS_IPC(state->smbreq->conn)) {
 552                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 553                         } else {
 554                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 555                         }
 556                 }
 557
 558                 tevent_req_nterror(req, status);
 559                 return tevent_req_post(req, ev);
 560                 break;
 561         }
 562         }
 563
 564         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 565         return tevent_req_post(req, ev);
 566 }
 567
 568 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq)
 569 {
 570         struct tevent_req *req = tevent_req_callback_data(subreq,
 571                                                           struct tevent_req);
 572         struct smbd_smb2_ioctl_state *ioctl_state = tevent_req_data(req,
 573                                                 struct smbd_smb2_ioctl_state);
 574         struct srv_copychunk_rsp cc_rsp;
 575         NTSTATUS status;
 576         bool pack_rsp = false;
 577
 578         ZERO_STRUCT(cc_rsp);
 579         status = fsctl_srv_copychunk_recv(subreq, &cc_rsp, &pack_rsp);
 580         TALLOC_FREE(subreq);
 581         if (pack_rsp == true) {
 582                 enum ndr_err_code ndr_ret;
 583                 ndr_ret = ndr_push_struct_blob(&ioctl_state->out_output,
 584                                                ioctl_state,
 585                                                &cc_rsp,
 586                                 (ndr_push_flags_fn_t)ndr_push_srv_copychunk_rsp);
 587                 if (ndr_ret != NDR_ERR_SUCCESS) {
 588                         status = NT_STATUS_INTERNAL_ERROR;
 589                 }
 590         }
 591
 592         if (!tevent_req_nterror(req, status)) {
 593                 tevent_req_done(req);
 594         }
 595 }