fs/smb/client/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  */
  12
  13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14  /* Note that there are handle based routines which must be                   */
  15  /* treated slightly differently for reconnection purposes since we never     */
  16  /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/vfs.h>
  21 #include <linux/task_io_accounting_ops.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/uuid.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/xattr.h>
  26 #include <linux/netfs.h>
  27 #include <trace/events/netfs.h>
  28 #include "cifsglob.h"
  29 #include "cifsacl.h"
  30 #include "cifsproto.h"
  31 #include "smb2proto.h"
  32 #include "cifs_unicode.h"
  33 #include "cifs_debug.h"
  34 #include "ntlmssp.h"
  35 #include "smb2status.h"
  36 #include "smb2glob.h"
  37 #include "cifspdu.h"
  38 #include "cifs_spnego.h"
  39 #include "smbdirect.h"
  40 #include "trace.h"
  41 #ifdef CONFIG_CIFS_DFS_UPCALL
  42 #include "dfs_cache.h"
  43 #endif
  44 #include "cached_dir.h"
  45
  46 /*
  47  *  The following table defines the expected "StructureSize" of SMB2 requests
  48  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  49  *
  50  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  51  *  indexed by command in host byte order.
  52  */
  53 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  54         /* SMB2_NEGOTIATE */ 36,
  55         /* SMB2_SESSION_SETUP */ 25,
  56         /* SMB2_LOGOFF */ 4,
  57         /* SMB2_TREE_CONNECT */ 9,
  58         /* SMB2_TREE_DISCONNECT */ 4,
  59         /* SMB2_CREATE */ 57,
  60         /* SMB2_CLOSE */ 24,
  61         /* SMB2_FLUSH */ 24,
  62         /* SMB2_READ */ 49,
  63         /* SMB2_WRITE */ 49,
  64         /* SMB2_LOCK */ 48,
  65         /* SMB2_IOCTL */ 57,
  66         /* SMB2_CANCEL */ 4,
  67         /* SMB2_ECHO */ 4,
  68         /* SMB2_QUERY_DIRECTORY */ 33,
  69         /* SMB2_CHANGE_NOTIFY */ 32,
  70         /* SMB2_QUERY_INFO */ 41,
  71         /* SMB2_SET_INFO */ 33,
  72         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  73 };
  74
  75 int smb3_encryption_required(const struct cifs_tcon *tcon)
  76 {
  77         if (!tcon || !tcon->ses)
  78                 return 0;
  79         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  80             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  81                 return 1;
  82         if (tcon->seal &&
  83             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  84                 return 1;
  85         return 0;
  86 }
  87
  88 static void
  89 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  90                   const struct cifs_tcon *tcon,
  91                   struct TCP_Server_Info *server)
  92 {
  93         struct smb3_hdr_req *smb3_hdr;
  94
  95         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  96         shdr->StructureSize = cpu_to_le16(64);
  97         shdr->Command = smb2_cmd;
  98
  99         if (server) {
 100                 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
 101                 if (server->dialect >= SMB30_PROT_ID) {
 102                         smb3_hdr = (struct smb3_hdr_req *)shdr;
 103                         /*
 104                          * if primary channel is not set yet, use default
 105                          * channel for chan sequence num
 106                          */
 107                         if (SERVER_IS_CHAN(server))
 108                                 smb3_hdr->ChannelSequence =
 109                                         cpu_to_le16(server->primary_server->channel_sequence_num);
 110                         else
 111                                 smb3_hdr->ChannelSequence =
 112                                         cpu_to_le16(server->channel_sequence_num);
 113                 }
 114                 spin_lock(&server->req_lock);
 115                 /* Request up to 10 credits but don't go over the limit. */
 116                 if (server->credits >= server->max_credits)
 117                         shdr->CreditRequest = cpu_to_le16(0);
 118                 else
 119                         shdr->CreditRequest = cpu_to_le16(
 120                                 min_t(int, server->max_credits -
 121                                                 server->credits, 10));
 122                 spin_unlock(&server->req_lock);
 123         } else {
 124                 shdr->CreditRequest = cpu_to_le16(2);
 125         }
 126         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 127
 128         if (!tcon)
 129                 goto out;
 130
 131         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 132         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 133         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 134                 shdr->CreditCharge = cpu_to_le16(1);
 135         /* else CreditCharge MBZ */
 136
 137         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 138         /* Uid is not converted */
 139         if (tcon->ses)
 140                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 141
 142         /*
 143          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 144          * to pass the path on the Open SMB prefixed by \\server\share.
 145          * Not sure when we would need to do the augmented path (if ever) and
 146          * setting this flag breaks the SMB2 open operation since it is
 147          * illegal to send an empty path name (without \\server\share prefix)
 148          * when the DFS flag is set in the SMB open header. We could
 149          * consider setting the flag on all operations other than open
 150          * but it is safer to net set it for now.
 151          */
 152 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 153                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 154
 155         if (server && server->sign && !smb3_encryption_required(tcon))
 156                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 157 out:
 158         return;
 159 }
 160
 161 /* helper function for code reuse */
 162 static int
 163 cifs_chan_skip_or_disable(struct cifs_ses *ses,
 164                           struct TCP_Server_Info *server,
 165                           bool from_reconnect)
 166 {
 167         struct TCP_Server_Info *pserver;
 168         unsigned int chan_index;
 169
 170         if (SERVER_IS_CHAN(server)) {
 171                 cifs_dbg(VFS,
 172                         "server %s does not support multichannel anymore. Skip secondary channel\n",
 173                          ses->server->hostname);
 174
 175                 spin_lock(&ses->chan_lock);
 176                 chan_index = cifs_ses_get_chan_index(ses, server);
 177                 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 178                         spin_unlock(&ses->chan_lock);
 179                         goto skip_terminate;
 180                 }
 181
 182                 ses->chans[chan_index].server = NULL;
 183                 server->terminate = true;
 184                 spin_unlock(&ses->chan_lock);
 185
 186                 /*
 187                  * the above reference of server by channel
 188                  * needs to be dropped without holding chan_lock
 189                  * as cifs_put_tcp_session takes a higher lock
 190                  * i.e. cifs_tcp_ses_lock
 191                  */
 192                 cifs_put_tcp_session(server, from_reconnect);
 193
 194                 cifs_signal_cifsd_for_reconnect(server, false);
 195
 196                 /* mark primary server as needing reconnect */
 197                 pserver = server->primary_server;
 198                 cifs_signal_cifsd_for_reconnect(pserver, false);
 199 skip_terminate:
 200                 return -EHOSTDOWN;
 201         }
 202
 203         cifs_server_dbg(VFS,
 204                 "server does not support multichannel anymore. Disable all other channels\n");
 205         cifs_disable_secondary_channels(ses);
 206
 207
 208         return 0;
 209 }
 210
 211 static int
 212 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 213                struct TCP_Server_Info *server, bool from_reconnect)
 214 {
 215         int rc = 0;
 216         struct nls_table *nls_codepage = NULL;
 217         struct cifs_ses *ses;
 218         int xid;
 219
 220         /*
 221          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 222          * check for tcp and smb session status done differently
 223          * for those three - in the calling routine.
 224          */
 225         if (tcon == NULL)
 226                 return 0;
 227
 228         /*
 229          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 230          * cifs_tree_connect().
 231          */
 232         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 233                 return 0;
 234
 235         spin_lock(&tcon->tc_lock);
 236         if (tcon->status == TID_EXITING) {
 237                 /*
 238                  * only tree disconnect allowed when disconnecting ...
 239                  */
 240                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 241                         spin_unlock(&tcon->tc_lock);
 242                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 243                                  smb2_command);
 244                         return -ENODEV;
 245                 }
 246         }
 247         spin_unlock(&tcon->tc_lock);
 248
 249         ses = tcon->ses;
 250         if (!ses)
 251                 return -EIO;
 252         spin_lock(&ses->ses_lock);
 253         if (ses->ses_status == SES_EXITING) {
 254                 spin_unlock(&ses->ses_lock);
 255                 return -EIO;
 256         }
 257         spin_unlock(&ses->ses_lock);
 258         if (!ses->server || !server)
 259                 return -EIO;
 260
 261         spin_lock(&server->srv_lock);
 262         if (server->tcpStatus == CifsNeedReconnect) {
 263                 /*
 264                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 265                  * here since they are implicitly done when session drops.
 266                  */
 267                 switch (smb2_command) {
 268                 /*
 269                  * BB Should we keep oplock break and add flush to exceptions?
 270                  */
 271                 case SMB2_TREE_DISCONNECT:
 272                 case SMB2_CANCEL:
 273                 case SMB2_CLOSE:
 274                 case SMB2_OPLOCK_BREAK:
 275                         spin_unlock(&server->srv_lock);
 276                         return -EAGAIN;
 277                 }
 278         }
 279
 280         /* if server is marked for termination, cifsd will cleanup */
 281         if (server->terminate) {
 282                 spin_unlock(&server->srv_lock);
 283                 return -EHOSTDOWN;
 284         }
 285         spin_unlock(&server->srv_lock);
 286
 287 again:
 288         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 289         if (rc)
 290                 return rc;
 291
 292         spin_lock(&ses->chan_lock);
 293         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 294                 spin_unlock(&ses->chan_lock);
 295                 return 0;
 296         }
 297         spin_unlock(&ses->chan_lock);
 298         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 299                  tcon->ses->chans_need_reconnect,
 300                  tcon->need_reconnect);
 301
 302         mutex_lock(&ses->session_mutex);
 303         /*
 304          * if this is called by delayed work, and the channel has been disabled
 305          * in parallel, the delayed work can continue to execute in parallel
 306          * there's a chance that this channel may not exist anymore
 307          */
 308         spin_lock(&server->srv_lock);
 309         if (server->tcpStatus == CifsExiting) {
 310                 spin_unlock(&server->srv_lock);
 311                 mutex_unlock(&ses->session_mutex);
 312                 rc = -EHOSTDOWN;
 313                 goto out;
 314         }
 315
 316         /*
 317          * Recheck after acquire mutex. If another thread is negotiating
 318          * and the server never sends an answer the socket will be closed
 319          * and tcpStatus set to reconnect.
 320          */
 321         if (server->tcpStatus == CifsNeedReconnect) {
 322                 spin_unlock(&server->srv_lock);
 323                 mutex_unlock(&ses->session_mutex);
 324
 325                 if (tcon->retry)
 326                         goto again;
 327
 328                 rc = -EHOSTDOWN;
 329                 goto out;
 330         }
 331         spin_unlock(&server->srv_lock);
 332
 333         nls_codepage = ses->local_nls;
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously
 337          * reconnect the same SMB session
 338          */
 339         spin_lock(&ses->ses_lock);
 340         spin_lock(&ses->chan_lock);
 341         if (!cifs_chan_needs_reconnect(ses, server) &&
 342             ses->ses_status == SES_GOOD) {
 343                 spin_unlock(&ses->chan_lock);
 344                 spin_unlock(&ses->ses_lock);
 345                 /* this means that we only need to tree connect */
 346                 if (tcon->need_reconnect)
 347                         goto skip_sess_setup;
 348
 349                 mutex_unlock(&ses->session_mutex);
 350                 goto out;
 351         }
 352         spin_unlock(&ses->chan_lock);
 353         spin_unlock(&ses->ses_lock);
 354
 355         rc = cifs_negotiate_protocol(0, ses, server);
 356         if (!rc) {
 357                 /*
 358                  * if server stopped supporting multichannel
 359                  * and the first channel reconnected, disable all the others.
 360                  */
 361                 if (ses->chan_count > 1 &&
 362                     !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 363                         rc = cifs_chan_skip_or_disable(ses, server,
 364                                                        from_reconnect);
 365                         if (rc) {
 366                                 mutex_unlock(&ses->session_mutex);
 367                                 goto out;
 368                         }
 369                 }
 370
 371                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 372                 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
 373                         /*
 374                          * Try alternate password for next reconnect (key rotation
 375                          * could be enabled on the server e.g.) if an alternate
 376                          * password is available and the current password is expired,
 377                          * but do not swap on non pwd related errors like host down
 378                          */
 379                         if (ses->password2)
 380                                 swap(ses->password2, ses->password);
 381                 }
 382
 383                 if ((rc == -EACCES) && !tcon->retry) {
 384                         mutex_unlock(&ses->session_mutex);
 385                         rc = -EHOSTDOWN;
 386                         goto failed;
 387                 } else if (rc) {
 388                         mutex_unlock(&ses->session_mutex);
 389                         goto out;
 390                 }
 391         } else {
 392                 mutex_unlock(&ses->session_mutex);
 393                 goto out;
 394         }
 395
 396 skip_sess_setup:
 397         if (!tcon->need_reconnect) {
 398                 mutex_unlock(&ses->session_mutex);
 399                 goto out;
 400         }
 401         cifs_mark_open_files_invalid(tcon);
 402         if (tcon->use_persistent)
 403                 tcon->need_reopen_files = true;
 404
 405         rc = cifs_tree_connect(0, tcon, nls_codepage);
 406
 407         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 408         if (rc) {
 409                 /* If sess reconnected but tcon didn't, something strange ... */
 410                 mutex_unlock(&ses->session_mutex);
 411                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 412                 goto out;
 413         }
 414
 415         spin_lock(&ses->ses_lock);
 416         if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
 417                 spin_unlock(&ses->ses_lock);
 418                 mutex_unlock(&ses->session_mutex);
 419                 goto skip_add_channels;
 420         }
 421         ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
 422         spin_unlock(&ses->ses_lock);
 423
 424         if (!rc &&
 425             (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
 426             server->ops->query_server_interfaces) {
 427                 mutex_unlock(&ses->session_mutex);
 428
 429                 /*
 430                  * query server network interfaces, in case they change
 431                  */
 432                 xid = get_xid();
 433                 rc = server->ops->query_server_interfaces(xid, tcon, false);
 434                 free_xid(xid);
 435
 436                 if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
 437                         /*
 438                          * some servers like Azure SMB server do not advertise
 439                          * that multichannel has been disabled with server
 440                          * capabilities, rather return STATUS_NOT_IMPLEMENTED.
 441                          * treat this as server not supporting multichannel
 442                          */
 443
 444                         rc = cifs_chan_skip_or_disable(ses, server,
 445                                                        from_reconnect);
 446                         goto skip_add_channels;
 447                 } else if (rc)
 448                         cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 449                                  __func__, rc);
 450
 451                 if (ses->chan_max > ses->chan_count &&
 452                     ses->iface_count &&
 453                     !SERVER_IS_CHAN(server)) {
 454                         if (ses->chan_count == 1) {
 455                                 cifs_server_dbg(VFS, "supports multichannel now\n");
 456                                 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
 457                                                  (SMB_INTERFACE_POLL_INTERVAL * HZ));
 458                         }
 459
 460                         cifs_try_adding_channels(ses);
 461                 }
 462         } else {
 463                 mutex_unlock(&ses->session_mutex);
 464         }
 465
 466 skip_add_channels:
 467         spin_lock(&ses->ses_lock);
 468         ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
 469         spin_unlock(&ses->ses_lock);
 470
 471         if (smb2_command != SMB2_INTERNAL_CMD)
 472                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 473
 474         atomic_inc(&tconInfoReconnectCount);
 475 out:
 476         /*
 477          * Check if handle based operation so we know whether we can continue
 478          * or not without returning to caller to reset file handle.
 479          */
 480         /*
 481          * BB Is flush done by server on drop of tcp session? Should we special
 482          * case it and skip above?
 483          */
 484         switch (smb2_command) {
 485         case SMB2_FLUSH:
 486         case SMB2_READ:
 487         case SMB2_WRITE:
 488         case SMB2_LOCK:
 489         case SMB2_QUERY_DIRECTORY:
 490         case SMB2_CHANGE_NOTIFY:
 491         case SMB2_QUERY_INFO:
 492         case SMB2_SET_INFO:
 493                 rc = -EAGAIN;
 494         }
 495 failed:
 496         return rc;
 497 }
 498
 499 static void
 500 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 501                struct TCP_Server_Info *server,
 502                void *buf,
 503                unsigned int *total_len)
 504 {
 505         struct smb2_pdu *spdu = buf;
 506         /* lookup word count ie StructureSize from table */
 507         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 508
 509         /*
 510          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 511          * largest operations (Create)
 512          */
 513         memset(buf, 0, 256);
 514
 515         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 516         spdu->StructureSize2 = cpu_to_le16(parmsize);
 517
 518         *total_len = parmsize + sizeof(struct smb2_hdr);
 519 }
 520
 521 /*
 522  * Allocate and return pointer to an SMB request hdr, and set basic
 523  * SMB information in the SMB header. If the return code is zero, this
 524  * function must have filled in request_buf pointer.
 525  */
 526 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 527                                  struct TCP_Server_Info *server,
 528                                  void **request_buf, unsigned int *total_len)
 529 {
 530         /* BB eventually switch this to SMB2 specific small buf size */
 531         switch (smb2_command) {
 532         case SMB2_SET_INFO:
 533         case SMB2_QUERY_INFO:
 534                 *request_buf = cifs_buf_get();
 535                 break;
 536         default:
 537                 *request_buf = cifs_small_buf_get();
 538                 break;
 539         }
 540         if (*request_buf == NULL) {
 541                 /* BB should we add a retry in here if not a writepage? */
 542                 return -ENOMEM;
 543         }
 544
 545         fill_small_buf(smb2_command, tcon, server,
 546                        (struct smb2_hdr *)(*request_buf),
 547                        total_len);
 548
 549         if (tcon != NULL) {
 550                 uint16_t com_code = le16_to_cpu(smb2_command);
 551                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 552                 cifs_stats_inc(&tcon->num_smbs_sent);
 553         }
 554
 555         return 0;
 556 }
 557
 558 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 559                                struct TCP_Server_Info *server,
 560                                void **request_buf, unsigned int *total_len)
 561 {
 562         int rc;
 563
 564         rc = smb2_reconnect(smb2_command, tcon, server, false);
 565         if (rc)
 566                 return rc;
 567
 568         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 569                                      total_len);
 570 }
 571
 572 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 573                                struct TCP_Server_Info *server,
 574                                void **request_buf, unsigned int *total_len)
 575 {
 576         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 577         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 578                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 579                                              request_buf, total_len);
 580         }
 581         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 582                                    request_buf, total_len);
 583 }
 584
 585 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 586
 587 static void
 588 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 589 {
 590         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 591         pneg_ctxt->DataLength = cpu_to_le16(38);
 592         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 593         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 594         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 595         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 596 }
 597
 598 static void
 599 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 600 {
 601         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 602         pneg_ctxt->DataLength =
 603                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 604                           - sizeof(struct smb2_neg_context));
 605         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 606         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 607         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 608         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 609 }
 610
 611 static unsigned int
 612 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 613 {
 614         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 615         unsigned short num_algs = 1; /* number of signing algorithms sent */
 616
 617         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 618         /*
 619          * Context Data length must be rounded to multiple of 8 for some servers
 620          */
 621         pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 622                                             sizeof(struct smb2_neg_context) +
 623                                             (num_algs * sizeof(u16)), 8));
 624         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 625         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 626
 627         ctxt_len += sizeof(__le16) * num_algs;
 628         ctxt_len = ALIGN(ctxt_len, 8);
 629         return ctxt_len;
 630         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 631 }
 632
 633 static void
 634 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 635 {
 636         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 637         if (require_gcm_256) {
 638                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 639                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 640                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 641         } else if (enable_gcm_256) {
 642                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 643                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 644                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 645                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 646                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 647         } else {
 648                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 649                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 650                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 651                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 652         }
 653 }
 654
 655 static unsigned int
 656 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 657 {
 658         struct nls_table *cp = load_nls_default();
 659
 660         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 661
 662         /* copy up to max of first 100 bytes of server name to NetName field */
 663         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 664         /* context size is DataLength + minimal smb2_neg_context */
 665         return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 666 }
 667
 668 static void
 669 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 670 {
 671         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 672         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 673         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 674         pneg_ctxt->Name[0] = 0x93;
 675         pneg_ctxt->Name[1] = 0xAD;
 676         pneg_ctxt->Name[2] = 0x25;
 677         pneg_ctxt->Name[3] = 0x50;
 678         pneg_ctxt->Name[4] = 0x9C;
 679         pneg_ctxt->Name[5] = 0xB4;
 680         pneg_ctxt->Name[6] = 0x11;
 681         pneg_ctxt->Name[7] = 0xE7;
 682         pneg_ctxt->Name[8] = 0xB4;
 683         pneg_ctxt->Name[9] = 0x23;
 684         pneg_ctxt->Name[10] = 0x83;
 685         pneg_ctxt->Name[11] = 0xDE;
 686         pneg_ctxt->Name[12] = 0x96;
 687         pneg_ctxt->Name[13] = 0x8B;
 688         pneg_ctxt->Name[14] = 0xCD;
 689         pneg_ctxt->Name[15] = 0x7C;
 690 }
 691
 692 static void
 693 assemble_neg_contexts(struct smb2_negotiate_req *req,
 694                       struct TCP_Server_Info *server, unsigned int *total_len)
 695 {
 696         unsigned int ctxt_len, neg_context_count;
 697         struct TCP_Server_Info *pserver;
 698         char *pneg_ctxt;
 699         char *hostname;
 700
 701         if (*total_len > 200) {
 702                 /* In case length corrupted don't want to overrun smb buffer */
 703                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 704                 return;
 705         }
 706
 707         /*
 708          * round up total_len of fixed part of SMB3 negotiate request to 8
 709          * byte boundary before adding negotiate contexts
 710          */
 711         *total_len = ALIGN(*total_len, 8);
 712
 713         pneg_ctxt = (*total_len) + (char *)req;
 714         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 715
 716         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 717         ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 718         *total_len += ctxt_len;
 719         pneg_ctxt += ctxt_len;
 720
 721         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 722         ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 723         *total_len += ctxt_len;
 724         pneg_ctxt += ctxt_len;
 725
 726         /*
 727          * secondary channels don't have the hostname field populated
 728          * use the hostname field in the primary channel instead
 729          */
 730         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
 731         cifs_server_lock(pserver);
 732         hostname = pserver->hostname;
 733         if (hostname && (hostname[0] != 0)) {
 734                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 735                                               hostname);
 736                 *total_len += ctxt_len;
 737                 pneg_ctxt += ctxt_len;
 738                 neg_context_count = 3;
 739         } else
 740                 neg_context_count = 2;
 741         cifs_server_unlock(pserver);
 742
 743         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 744         *total_len += sizeof(struct smb2_posix_neg_context);
 745         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 746         neg_context_count++;
 747
 748         if (server->compression.requested) {
 749                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 750                                 pneg_ctxt);
 751                 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 752                 *total_len += ctxt_len;
 753                 pneg_ctxt += ctxt_len;
 754                 neg_context_count++;
 755         }
 756
 757         if (enable_negotiate_signing) {
 758                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 759                                 pneg_ctxt);
 760                 *total_len += ctxt_len;
 761                 pneg_ctxt += ctxt_len;
 762                 neg_context_count++;
 763         }
 764
 765         /* check for and add transport_capabilities and signing capabilities */
 766         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 767
 768 }
 769
 770 /* If invalid preauth context warn but use what we requested, SHA-512 */
 771 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 772 {
 773         unsigned int len = le16_to_cpu(ctxt->DataLength);
 774
 775         /*
 776          * Caller checked that DataLength remains within SMB boundary. We still
 777          * need to confirm that one HashAlgorithms member is accounted for.
 778          */
 779         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 780                 pr_warn_once("server sent bad preauth context\n");
 781                 return;
 782         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 783                 pr_warn_once("server sent invalid SaltLength\n");
 784                 return;
 785         }
 786         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 787                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 788         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 789                 pr_warn_once("unknown SMB3 hash algorithm\n");
 790 }
 791
 792 static void decode_compress_ctx(struct TCP_Server_Info *server,
 793                          struct smb2_compression_capabilities_context *ctxt)
 794 {
 795         unsigned int len = le16_to_cpu(ctxt->DataLength);
 796         __le16 alg;
 797
 798         server->compression.enabled = false;
 799
 800         /*
 801          * Caller checked that DataLength remains within SMB boundary. We still
 802          * need to confirm that one CompressionAlgorithms member is accounted
 803          * for.
 804          */
 805         if (len < 10) {
 806                 pr_warn_once("server sent bad compression cntxt\n");
 807                 return;
 808         }
 809
 810         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 811                 pr_warn_once("invalid SMB3 compress algorithm count\n");
 812                 return;
 813         }
 814
 815         alg = ctxt->CompressionAlgorithms[0];
 816
 817         /* 'NONE' (0) compressor type is never negotiated */
 818         if (alg == 0 || le16_to_cpu(alg) > 3) {
 819                 pr_warn_once("invalid compression algorithm '%u'\n", alg);
 820                 return;
 821         }
 822
 823         server->compression.alg = alg;
 824         server->compression.enabled = true;
 825 }
 826
 827 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 828                               struct smb2_encryption_neg_context *ctxt)
 829 {
 830         unsigned int len = le16_to_cpu(ctxt->DataLength);
 831
 832         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 833         /*
 834          * Caller checked that DataLength remains within SMB boundary. We still
 835          * need to confirm that one Cipher flexible array member is accounted
 836          * for.
 837          */
 838         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 839                 pr_warn_once("server sent bad crypto ctxt len\n");
 840                 return -EINVAL;
 841         }
 842
 843         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 844                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 845                 return -EINVAL;
 846         }
 847         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 848         if (require_gcm_256) {
 849                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 850                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 851                         return -EOPNOTSUPP;
 852                 }
 853         } else if (ctxt->Ciphers[0] == 0) {
 854                 /*
 855                  * e.g. if server only supported AES256_CCM (very unlikely)
 856                  * or server supported no encryption types or had all disabled.
 857                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 858                  * in which mount requested encryption ("seal") checks later
 859                  * on during tree connection will return proper rc, but if
 860                  * seal not requested by client, since server is allowed to
 861                  * return 0 to indicate no supported cipher, we can't fail here
 862                  */
 863                 server->cipher_type = 0;
 864                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 865                 pr_warn_once("Server does not support requested encryption types\n");
 866                 return 0;
 867         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 868                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 869                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 870                 /* server returned a cipher we didn't ask for */
 871                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 872                 return -EINVAL;
 873         }
 874         server->cipher_type = ctxt->Ciphers[0];
 875         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 876         return 0;
 877 }
 878
 879 static void decode_signing_ctx(struct TCP_Server_Info *server,
 880                                struct smb2_signing_capabilities *pctxt)
 881 {
 882         unsigned int len = le16_to_cpu(pctxt->DataLength);
 883
 884         /*
 885          * Caller checked that DataLength remains within SMB boundary. We still
 886          * need to confirm that one SigningAlgorithms flexible array member is
 887          * accounted for.
 888          */
 889         if ((len < 4) || (len > 16)) {
 890                 pr_warn_once("server sent bad signing negcontext\n");
 891                 return;
 892         }
 893         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 894                 pr_warn_once("Invalid signing algorithm count\n");
 895                 return;
 896         }
 897         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 898                 pr_warn_once("unknown signing algorithm\n");
 899                 return;
 900         }
 901
 902         server->signing_negotiated = true;
 903         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 904         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 905                      server->signing_algorithm);
 906 }
 907
 908
 909 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 910                                      struct TCP_Server_Info *server,
 911                                      unsigned int len_of_smb)
 912 {
 913         struct smb2_neg_context *pctx;
 914         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 915         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 916         unsigned int len_of_ctxts, i;
 917         int rc = 0;
 918
 919         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 920         if (len_of_smb <= offset) {
 921                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 922                 return -EINVAL;
 923         }
 924
 925         len_of_ctxts = len_of_smb - offset;
 926
 927         for (i = 0; i < ctxt_cnt; i++) {
 928                 int clen;
 929                 /* check that offset is not beyond end of SMB */
 930                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 931                         break;
 932
 933                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 934                 clen = sizeof(struct smb2_neg_context)
 935                         + le16_to_cpu(pctx->DataLength);
 936                 /*
 937                  * 2.2.4 SMB2 NEGOTIATE Response
 938                  * Subsequent negotiate contexts MUST appear at the first 8-byte
 939                  * aligned offset following the previous negotiate context.
 940                  */
 941                 if (i + 1 != ctxt_cnt)
 942                         clen = ALIGN(clen, 8);
 943                 if (clen > len_of_ctxts)
 944                         break;
 945
 946                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 947                         decode_preauth_context(
 948                                 (struct smb2_preauth_neg_context *)pctx);
 949                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 950                         rc = decode_encrypt_ctx(server,
 951                                 (struct smb2_encryption_neg_context *)pctx);
 952                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 953                         decode_compress_ctx(server,
 954                                 (struct smb2_compression_capabilities_context *)pctx);
 955                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 956                         server->posix_ext_supported = true;
 957                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 958                         decode_signing_ctx(server,
 959                                 (struct smb2_signing_capabilities *)pctx);
 960                 else
 961                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 962                                 le16_to_cpu(pctx->ContextType));
 963                 if (rc)
 964                         break;
 965
 966                 offset += clen;
 967                 len_of_ctxts -= clen;
 968         }
 969         return rc;
 970 }
 971
 972 static struct create_posix *
 973 create_posix_buf(umode_t mode)
 974 {
 975         struct create_posix *buf;
 976
 977         buf = kzalloc(sizeof(struct create_posix),
 978                         GFP_KERNEL);
 979         if (!buf)
 980                 return NULL;
 981
 982         buf->ccontext.DataOffset =
 983                 cpu_to_le16(offsetof(struct create_posix, Mode));
 984         buf->ccontext.DataLength = cpu_to_le32(4);
 985         buf->ccontext.NameOffset =
 986                 cpu_to_le16(offsetof(struct create_posix, Name));
 987         buf->ccontext.NameLength = cpu_to_le16(16);
 988
 989         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 990         buf->Name[0] = 0x93;
 991         buf->Name[1] = 0xAD;
 992         buf->Name[2] = 0x25;
 993         buf->Name[3] = 0x50;
 994         buf->Name[4] = 0x9C;
 995         buf->Name[5] = 0xB4;
 996         buf->Name[6] = 0x11;
 997         buf->Name[7] = 0xE7;
 998         buf->Name[8] = 0xB4;
 999         buf->Name[9] = 0x23;
1000         buf->Name[10] = 0x83;
1001         buf->Name[11] = 0xDE;
1002         buf->Name[12] = 0x96;
1003         buf->Name[13] = 0x8B;
1004         buf->Name[14] = 0xCD;
1005         buf->Name[15] = 0x7C;
1006         buf->Mode = cpu_to_le32(mode);
1007         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
1008         return buf;
1009 }
1010
1011 static int
1012 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1013 {
1014         unsigned int num = *num_iovec;
1015
1016         iov[num].iov_base = create_posix_buf(mode);
1017         if (mode == ACL_NO_MODE)
1018                 cifs_dbg(FYI, "%s: no mode\n", __func__);
1019         if (iov[num].iov_base == NULL)
1020                 return -ENOMEM;
1021         iov[num].iov_len = sizeof(struct create_posix);
1022         *num_iovec = num + 1;
1023         return 0;
1024 }
1025
1026
1027 /*
1028  *
1029  *      SMB2 Worker functions follow:
1030  *
1031  *      The general structure of the worker functions is:
1032  *      1) Call smb2_init (assembles SMB2 header)
1033  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
1034  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
1035  *      4) Decode SMB2 command specific fields in the fixed length area
1036  *      5) Decode variable length data area (if any for this SMB2 command type)
1037  *      6) Call free smb buffer
1038  *      7) return
1039  *
1040  */
1041
1042 int
1043 SMB2_negotiate(const unsigned int xid,
1044                struct cifs_ses *ses,
1045                struct TCP_Server_Info *server)
1046 {
1047         struct smb_rqst rqst;
1048         struct smb2_negotiate_req *req;
1049         struct smb2_negotiate_rsp *rsp;
1050         struct kvec iov[1];
1051         struct kvec rsp_iov;
1052         int rc;
1053         int resp_buftype;
1054         int blob_offset, blob_length;
1055         char *security_blob;
1056         int flags = CIFS_NEG_OP;
1057         unsigned int total_len;
1058
1059         cifs_dbg(FYI, "Negotiate protocol\n");
1060
1061         if (!server) {
1062                 WARN(1, "%s: server is NULL!\n", __func__);
1063                 return -EIO;
1064         }
1065
1066         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1067                                  (void **) &req, &total_len);
1068         if (rc)
1069                 return rc;
1070
1071         req->hdr.SessionId = 0;
1072
1073         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1074         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1075
1076         if (strcmp(server->vals->version_string,
1077                    SMB3ANY_VERSION_STRING) == 0) {
1078                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1079                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1080                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1081                 req->DialectCount = cpu_to_le16(3);
1082                 total_len += 6;
1083         } else if (strcmp(server->vals->version_string,
1084                    SMBDEFAULT_VERSION_STRING) == 0) {
1085                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1086                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1087                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1088                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1089                 req->DialectCount = cpu_to_le16(4);
1090                 total_len += 8;
1091         } else {
1092                 /* otherwise send specific dialect */
1093                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1094                 req->DialectCount = cpu_to_le16(1);
1095                 total_len += 2;
1096         }
1097
1098         /* only one of SMB2 signing flags may be set in SMB2 request */
1099         if (ses->sign)
1100                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1101         else if (global_secflags & CIFSSEC_MAY_SIGN)
1102                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1103         else
1104                 req->SecurityMode = 0;
1105
1106         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1107         if (ses->chan_max > 1)
1108                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1109
1110         /* ClientGUID must be zero for SMB2.02 dialect */
1111         if (server->vals->protocol_id == SMB20_PROT_ID)
1112                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1113         else {
1114                 memcpy(req->ClientGUID, server->client_guid,
1115                         SMB2_CLIENT_GUID_SIZE);
1116                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1117                     (strcmp(server->vals->version_string,
1118                      SMB3ANY_VERSION_STRING) == 0) ||
1119                     (strcmp(server->vals->version_string,
1120                      SMBDEFAULT_VERSION_STRING) == 0))
1121                         assemble_neg_contexts(req, server, &total_len);
1122         }
1123         iov[0].iov_base = (char *)req;
1124         iov[0].iov_len = total_len;
1125
1126         memset(&rqst, 0, sizeof(struct smb_rqst));
1127         rqst.rq_iov = iov;
1128         rqst.rq_nvec = 1;
1129
1130         rc = cifs_send_recv(xid, ses, server,
1131                             &rqst, &resp_buftype, flags, &rsp_iov);
1132         cifs_small_buf_release(req);
1133         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1134         /*
1135          * No tcon so can't do
1136          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1137          */
1138         if (rc == -EOPNOTSUPP) {
1139                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
1140                 goto neg_exit;
1141         } else if (rc != 0)
1142                 goto neg_exit;
1143
1144         rc = -EIO;
1145         if (strcmp(server->vals->version_string,
1146                    SMB3ANY_VERSION_STRING) == 0) {
1147                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1148                         cifs_server_dbg(VFS,
1149                                 "SMB2 dialect returned but not requested\n");
1150                         goto neg_exit;
1151                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1152                         cifs_server_dbg(VFS,
1153                                 "SMB2.1 dialect returned but not requested\n");
1154                         goto neg_exit;
1155                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1156                         /* ops set to 3.0 by default for default so update */
1157                         server->ops = &smb311_operations;
1158                         server->vals = &smb311_values;
1159                 }
1160         } else if (strcmp(server->vals->version_string,
1161                    SMBDEFAULT_VERSION_STRING) == 0) {
1162                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1163                         cifs_server_dbg(VFS,
1164                                 "SMB2 dialect returned but not requested\n");
1165                         goto neg_exit;
1166                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1167                         /* ops set to 3.0 by default for default so update */
1168                         server->ops = &smb21_operations;
1169                         server->vals = &smb21_values;
1170                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1171                         server->ops = &smb311_operations;
1172                         server->vals = &smb311_values;
1173                 }
1174         } else if (le16_to_cpu(rsp->DialectRevision) !=
1175                                 server->vals->protocol_id) {
1176                 /* if requested single dialect ensure returned dialect matched */
1177                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1178                                 le16_to_cpu(rsp->DialectRevision));
1179                 goto neg_exit;
1180         }
1181
1182         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1183
1184         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1185                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1186         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1187                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1188         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1189                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1190         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1191                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1192         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1193                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1194         else {
1195                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1196                                 le16_to_cpu(rsp->DialectRevision));
1197                 goto neg_exit;
1198         }
1199
1200         rc = 0;
1201         server->dialect = le16_to_cpu(rsp->DialectRevision);
1202
1203         /*
1204          * Keep a copy of the hash after negprot. This hash will be
1205          * the starting hash value for all sessions made from this
1206          * server.
1207          */
1208         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1209                SMB2_PREAUTH_HASH_SIZE);
1210
1211         /* SMB2 only has an extended negflavor */
1212         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1213         /* set it to the maximum buffer size value we can send with 1 credit */
1214         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1215                                SMB2_MAX_BUFFER_SIZE);
1216         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1217         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1218         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1219         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1220                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1221                                 server->sec_mode);
1222         server->capabilities = le32_to_cpu(rsp->Capabilities);
1223         /* Internal types */
1224         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1225
1226         /*
1227          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1228          * Set the cipher type manually.
1229          */
1230         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1231                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1232
1233         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1234                                                (struct smb2_hdr *)rsp);
1235         /*
1236          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1237          * for us will be
1238          *      ses->sectype = RawNTLMSSP;
1239          * but for time being this is our only auth choice so doesn't matter.
1240          * We just found a server which sets blob length to zero expecting raw.
1241          */
1242         if (blob_length == 0) {
1243                 cifs_dbg(FYI, "missing security blob on negprot\n");
1244                 server->sec_ntlmssp = true;
1245         }
1246
1247         rc = cifs_enable_signing(server, ses->sign);
1248         if (rc)
1249                 goto neg_exit;
1250         if (blob_length) {
1251                 rc = decode_negTokenInit(security_blob, blob_length, server);
1252                 if (rc == 1)
1253                         rc = 0;
1254                 else if (rc == 0)
1255                         rc = -EIO;
1256         }
1257
1258         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1259                 if (rsp->NegotiateContextCount)
1260                         rc = smb311_decode_neg_context(rsp, server,
1261                                                        rsp_iov.iov_len);
1262                 else
1263                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1264         }
1265 neg_exit:
1266         free_rsp_buf(resp_buftype, rsp);
1267         return rc;
1268 }
1269
1270 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1271 {
1272         int rc;
1273         struct validate_negotiate_info_req *pneg_inbuf;
1274         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1275         u32 rsplen;
1276         u32 inbuflen; /* max of 4 dialects */
1277         struct TCP_Server_Info *server = tcon->ses->server;
1278
1279         cifs_dbg(FYI, "validate negotiate\n");
1280
1281         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1282         if (server->dialect == SMB311_PROT_ID)
1283                 return 0;
1284
1285         /*
1286          * validation ioctl must be signed, so no point sending this if we
1287          * can not sign it (ie are not known user).  Even if signing is not
1288          * required (enabled but not negotiated), in those cases we selectively
1289          * sign just this, the first and only signed request on a connection.
1290          * Having validation of negotiate info  helps reduce attack vectors.
1291          */
1292         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1293                 return 0; /* validation requires signing */
1294
1295         if (tcon->ses->user_name == NULL) {
1296                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1297                 return 0; /* validation requires signing */
1298         }
1299
1300         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1301                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1302
1303         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1304         if (!pneg_inbuf)
1305                 return -ENOMEM;
1306
1307         pneg_inbuf->Capabilities =
1308                         cpu_to_le32(server->vals->req_capabilities);
1309         if (tcon->ses->chan_max > 1)
1310                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1311
1312         memcpy(pneg_inbuf->Guid, server->client_guid,
1313                                         SMB2_CLIENT_GUID_SIZE);
1314
1315         if (tcon->ses->sign)
1316                 pneg_inbuf->SecurityMode =
1317                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1318         else if (global_secflags & CIFSSEC_MAY_SIGN)
1319                 pneg_inbuf->SecurityMode =
1320                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1321         else
1322                 pneg_inbuf->SecurityMode = 0;
1323
1324
1325         if (strcmp(server->vals->version_string,
1326                 SMB3ANY_VERSION_STRING) == 0) {
1327                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1328                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1329                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1330                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1331                 /* SMB 2.1 not included so subtract one dialect from len */
1332                 inbuflen = sizeof(*pneg_inbuf) -
1333                                 (sizeof(pneg_inbuf->Dialects[0]));
1334         } else if (strcmp(server->vals->version_string,
1335                 SMBDEFAULT_VERSION_STRING) == 0) {
1336                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1337                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1338                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1339                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1340                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1341                 /* structure is big enough for 4 dialects */
1342                 inbuflen = sizeof(*pneg_inbuf);
1343         } else {
1344                 /* otherwise specific dialect was requested */
1345                 pneg_inbuf->Dialects[0] =
1346                         cpu_to_le16(server->vals->protocol_id);
1347                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1348                 /* structure is big enough for 4 dialects, sending only 1 */
1349                 inbuflen = sizeof(*pneg_inbuf) -
1350                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1351         }
1352
1353         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1354                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1355                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1356                 (char **)&pneg_rsp, &rsplen);
1357         if (rc == -EOPNOTSUPP) {
1358                 /*
1359                  * Old Windows versions or Netapp SMB server can return
1360                  * not supported error. Client should accept it.
1361                  */
1362                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1363                 rc = 0;
1364                 goto out_free_inbuf;
1365         } else if (rc != 0) {
1366                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1367                               rc);
1368                 rc = -EIO;
1369                 goto out_free_inbuf;
1370         }
1371
1372         rc = -EIO;
1373         if (rsplen != sizeof(*pneg_rsp)) {
1374                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1375                               rsplen);
1376
1377                 /* relax check since Mac returns max bufsize allowed on ioctl */
1378                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1379                         goto out_free_rsp;
1380         }
1381
1382         /* check validate negotiate info response matches what we got earlier */
1383         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1384                 goto vneg_out;
1385
1386         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1387                 goto vneg_out;
1388
1389         /* do not validate server guid because not saved at negprot time yet */
1390
1391         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1392               SMB2_LARGE_FILES) != server->capabilities)
1393                 goto vneg_out;
1394
1395         /* validate negotiate successful */
1396         rc = 0;
1397         cifs_dbg(FYI, "validate negotiate info successful\n");
1398         goto out_free_rsp;
1399
1400 vneg_out:
1401         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1402 out_free_rsp:
1403         kfree(pneg_rsp);
1404 out_free_inbuf:
1405         kfree(pneg_inbuf);
1406         return rc;
1407 }
1408
1409 enum securityEnum
1410 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1411 {
1412         switch (requested) {
1413         case Kerberos:
1414         case RawNTLMSSP:
1415                 return requested;
1416         case NTLMv2:
1417                 return RawNTLMSSP;
1418         case Unspecified:
1419                 if (server->sec_ntlmssp &&
1420                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1421                         return RawNTLMSSP;
1422                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1423                         (global_secflags & CIFSSEC_MAY_KRB5))
1424                         return Kerberos;
1425                 fallthrough;
1426         default:
1427                 return Unspecified;
1428         }
1429 }
1430
1431 struct SMB2_sess_data {
1432         unsigned int xid;
1433         struct cifs_ses *ses;
1434         struct TCP_Server_Info *server;
1435         struct nls_table *nls_cp;
1436         void (*func)(struct SMB2_sess_data *);
1437         int result;
1438         u64 previous_session;
1439
1440         /* we will send the SMB in three pieces:
1441          * a fixed length beginning part, an optional
1442          * SPNEGO blob (which can be zero length), and a
1443          * last part which will include the strings
1444          * and rest of bcc area. This allows us to avoid
1445          * a large buffer 17K allocation
1446          */
1447         int buf0_type;
1448         struct kvec iov[2];
1449 };
1450
1451 static int
1452 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1453 {
1454         int rc;
1455         struct cifs_ses *ses = sess_data->ses;
1456         struct TCP_Server_Info *server = sess_data->server;
1457         struct smb2_sess_setup_req *req;
1458         unsigned int total_len;
1459         bool is_binding = false;
1460
1461         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1462                                  (void **) &req,
1463                                  &total_len);
1464         if (rc)
1465                 return rc;
1466
1467         spin_lock(&ses->ses_lock);
1468         is_binding = (ses->ses_status == SES_GOOD);
1469         spin_unlock(&ses->ses_lock);
1470
1471         if (is_binding) {
1472                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1473                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1474                 req->PreviousSessionId = 0;
1475                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1476                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1477         } else {
1478                 /* First session, not a reauthenticate */
1479                 req->hdr.SessionId = 0;
1480                 /*
1481                  * if reconnect, we need to send previous sess id
1482                  * otherwise it is 0
1483                  */
1484                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1485                 req->Flags = 0; /* MBZ */
1486                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1487                          sess_data->previous_session);
1488         }
1489
1490         /* enough to enable echos and oplocks and one max size write */
1491         if (server->credits >= server->max_credits)
1492                 req->hdr.CreditRequest = cpu_to_le16(0);
1493         else
1494                 req->hdr.CreditRequest = cpu_to_le16(
1495                         min_t(int, server->max_credits -
1496                               server->credits, 130));
1497
1498         /* only one of SMB2 signing flags may be set in SMB2 request */
1499         if (server->sign)
1500                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1501         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1502                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1503         else
1504                 req->SecurityMode = 0;
1505
1506 #ifdef CONFIG_CIFS_DFS_UPCALL
1507         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1508 #else
1509         req->Capabilities = 0;
1510 #endif /* DFS_UPCALL */
1511
1512         req->Channel = 0; /* MBZ */
1513
1514         sess_data->iov[0].iov_base = (char *)req;
1515         /* 1 for pad */
1516         sess_data->iov[0].iov_len = total_len - 1;
1517         /*
1518          * This variable will be used to clear the buffer
1519          * allocated above in case of any error in the calling function.
1520          */
1521         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1522
1523         return 0;
1524 }
1525
1526 static void
1527 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1528 {
1529         struct kvec *iov = sess_data->iov;
1530
1531         /* iov[1] is already freed by caller */
1532         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1533                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1534
1535         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1536         sess_data->buf0_type = CIFS_NO_BUFFER;
1537 }
1538
1539 static int
1540 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1541 {
1542         int rc;
1543         struct smb_rqst rqst;
1544         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1545         struct kvec rsp_iov = { NULL, 0 };
1546
1547         /* Testing shows that buffer offset must be at location of Buffer[0] */
1548         req->SecurityBufferOffset =
1549                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1550         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1551
1552         memset(&rqst, 0, sizeof(struct smb_rqst));
1553         rqst.rq_iov = sess_data->iov;
1554         rqst.rq_nvec = 2;
1555
1556         /* BB add code to build os and lm fields */
1557         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1558                             sess_data->server,
1559                             &rqst,
1560                             &sess_data->buf0_type,
1561                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1562         cifs_small_buf_release(sess_data->iov[0].iov_base);
1563         if (rc == 0)
1564                 sess_data->ses->expired_pwd = false;
1565         else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED))
1566                 sess_data->ses->expired_pwd = true;
1567
1568         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1569
1570         return rc;
1571 }
1572
1573 static int
1574 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1575 {
1576         int rc = 0;
1577         struct cifs_ses *ses = sess_data->ses;
1578         struct TCP_Server_Info *server = sess_data->server;
1579
1580         cifs_server_lock(server);
1581         if (server->ops->generate_signingkey) {
1582                 rc = server->ops->generate_signingkey(ses, server);
1583                 if (rc) {
1584                         cifs_dbg(FYI,
1585                                 "SMB3 session key generation failed\n");
1586                         cifs_server_unlock(server);
1587                         return rc;
1588                 }
1589         }
1590         if (!server->session_estab) {
1591                 server->sequence_number = 0x2;
1592                 server->session_estab = true;
1593         }
1594         cifs_server_unlock(server);
1595
1596         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1597         return rc;
1598 }
1599
1600 #ifdef CONFIG_CIFS_UPCALL
1601 static void
1602 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1603 {
1604         int rc;
1605         struct cifs_ses *ses = sess_data->ses;
1606         struct TCP_Server_Info *server = sess_data->server;
1607         struct cifs_spnego_msg *msg;
1608         struct key *spnego_key = NULL;
1609         struct smb2_sess_setup_rsp *rsp = NULL;
1610         bool is_binding = false;
1611
1612         rc = SMB2_sess_alloc_buffer(sess_data);
1613         if (rc)
1614                 goto out;
1615
1616         spnego_key = cifs_get_spnego_key(ses, server);
1617         if (IS_ERR(spnego_key)) {
1618                 rc = PTR_ERR(spnego_key);
1619                 if (rc == -ENOKEY)
1620                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1621                 spnego_key = NULL;
1622                 goto out;
1623         }
1624
1625         msg = spnego_key->payload.data[0];
1626         /*
1627          * check version field to make sure that cifs.upcall is
1628          * sending us a response in an expected form
1629          */
1630         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1631                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1632                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1633                 rc = -EKEYREJECTED;
1634                 goto out_put_spnego_key;
1635         }
1636
1637         spin_lock(&ses->ses_lock);
1638         is_binding = (ses->ses_status == SES_GOOD);
1639         spin_unlock(&ses->ses_lock);
1640
1641         /* keep session key if binding */
1642         if (!is_binding) {
1643                 kfree_sensitive(ses->auth_key.response);
1644                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1645                                                  GFP_KERNEL);
1646                 if (!ses->auth_key.response) {
1647                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1648                                  msg->sesskey_len);
1649                         rc = -ENOMEM;
1650                         goto out_put_spnego_key;
1651                 }
1652                 ses->auth_key.len = msg->sesskey_len;
1653         }
1654
1655         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1656         sess_data->iov[1].iov_len = msg->secblob_len;
1657
1658         rc = SMB2_sess_sendreceive(sess_data);
1659         if (rc)
1660                 goto out_put_spnego_key;
1661
1662         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1663         /* keep session id and flags if binding */
1664         if (!is_binding) {
1665                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1666                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1667         }
1668
1669         rc = SMB2_sess_establish_session(sess_data);
1670 out_put_spnego_key:
1671         key_invalidate(spnego_key);
1672         key_put(spnego_key);
1673         if (rc) {
1674                 kfree_sensitive(ses->auth_key.response);
1675                 ses->auth_key.response = NULL;
1676                 ses->auth_key.len = 0;
1677         }
1678 out:
1679         sess_data->result = rc;
1680         sess_data->func = NULL;
1681         SMB2_sess_free_buffer(sess_data);
1682 }
1683 #else
1684 static void
1685 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1686 {
1687         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1688         sess_data->result = -EOPNOTSUPP;
1689         sess_data->func = NULL;
1690 }
1691 #endif
1692
1693 static void
1694 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1695
1696 static void
1697 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1698 {
1699         int rc;
1700         struct cifs_ses *ses = sess_data->ses;
1701         struct TCP_Server_Info *server = sess_data->server;
1702         struct smb2_sess_setup_rsp *rsp = NULL;
1703         unsigned char *ntlmssp_blob = NULL;
1704         bool use_spnego = false; /* else use raw ntlmssp */
1705         u16 blob_length = 0;
1706         bool is_binding = false;
1707
1708         /*
1709          * If memory allocation is successful, caller of this function
1710          * frees it.
1711          */
1712         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1713         if (!ses->ntlmssp) {
1714                 rc = -ENOMEM;
1715                 goto out_err;
1716         }
1717         ses->ntlmssp->sesskey_per_smbsess = true;
1718
1719         rc = SMB2_sess_alloc_buffer(sess_data);
1720         if (rc)
1721                 goto out_err;
1722
1723         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1724                                           &blob_length, ses, server,
1725                                           sess_data->nls_cp);
1726         if (rc)
1727                 goto out;
1728
1729         if (use_spnego) {
1730                 /* BB eventually need to add this */
1731                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1732                 rc = -EOPNOTSUPP;
1733                 goto out;
1734         }
1735         sess_data->iov[1].iov_base = ntlmssp_blob;
1736         sess_data->iov[1].iov_len = blob_length;
1737
1738         rc = SMB2_sess_sendreceive(sess_data);
1739         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1740
1741         /* If true, rc here is expected and not an error */
1742         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1743                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1744                 rc = 0;
1745
1746         if (rc)
1747                 goto out;
1748
1749         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1750                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1751                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1752                         le16_to_cpu(rsp->SecurityBufferOffset));
1753                 rc = -EIO;
1754                 goto out;
1755         }
1756         rc = decode_ntlmssp_challenge(rsp->Buffer,
1757                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1758         if (rc)
1759                 goto out;
1760
1761         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1762
1763         spin_lock(&ses->ses_lock);
1764         is_binding = (ses->ses_status == SES_GOOD);
1765         spin_unlock(&ses->ses_lock);
1766
1767         /* keep existing ses id and flags if binding */
1768         if (!is_binding) {
1769                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1770                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1771         }
1772
1773 out:
1774         kfree_sensitive(ntlmssp_blob);
1775         SMB2_sess_free_buffer(sess_data);
1776         if (!rc) {
1777                 sess_data->result = 0;
1778                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1779                 return;
1780         }
1781 out_err:
1782         kfree_sensitive(ses->ntlmssp);
1783         ses->ntlmssp = NULL;
1784         sess_data->result = rc;
1785         sess_data->func = NULL;
1786 }
1787
1788 static void
1789 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1790 {
1791         int rc;
1792         struct cifs_ses *ses = sess_data->ses;
1793         struct TCP_Server_Info *server = sess_data->server;
1794         struct smb2_sess_setup_req *req;
1795         struct smb2_sess_setup_rsp *rsp = NULL;
1796         unsigned char *ntlmssp_blob = NULL;
1797         bool use_spnego = false; /* else use raw ntlmssp */
1798         u16 blob_length = 0;
1799         bool is_binding = false;
1800
1801         rc = SMB2_sess_alloc_buffer(sess_data);
1802         if (rc)
1803                 goto out;
1804
1805         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1806         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1807
1808         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1809                                      ses, server,
1810                                      sess_data->nls_cp);
1811         if (rc) {
1812                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1813                 goto out;
1814         }
1815
1816         if (use_spnego) {
1817                 /* BB eventually need to add this */
1818                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1819                 rc = -EOPNOTSUPP;
1820                 goto out;
1821         }
1822         sess_data->iov[1].iov_base = ntlmssp_blob;
1823         sess_data->iov[1].iov_len = blob_length;
1824
1825         rc = SMB2_sess_sendreceive(sess_data);
1826         if (rc)
1827                 goto out;
1828
1829         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1830
1831         spin_lock(&ses->ses_lock);
1832         is_binding = (ses->ses_status == SES_GOOD);
1833         spin_unlock(&ses->ses_lock);
1834
1835         /* keep existing ses id and flags if binding */
1836         if (!is_binding) {
1837                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1838                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1839         }
1840
1841         rc = SMB2_sess_establish_session(sess_data);
1842 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1843         if (ses->server->dialect < SMB30_PROT_ID) {
1844                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1845                 /*
1846                  * The session id is opaque in terms of endianness, so we can't
1847                  * print it as a long long. we dump it as we got it on the wire
1848                  */
1849                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1850                          &ses->Suid);
1851                 cifs_dbg(VFS, "Session Key   %*ph\n",
1852                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1853                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1854                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1855         }
1856 #endif
1857 out:
1858         kfree_sensitive(ntlmssp_blob);
1859         SMB2_sess_free_buffer(sess_data);
1860         kfree_sensitive(ses->ntlmssp);
1861         ses->ntlmssp = NULL;
1862         sess_data->result = rc;
1863         sess_data->func = NULL;
1864 }
1865
1866 static int
1867 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1868 {
1869         int type;
1870         struct cifs_ses *ses = sess_data->ses;
1871         struct TCP_Server_Info *server = sess_data->server;
1872
1873         type = smb2_select_sectype(server, ses->sectype);
1874         cifs_dbg(FYI, "sess setup type %d\n", type);
1875         if (type == Unspecified) {
1876                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1877                 return -EINVAL;
1878         }
1879
1880         switch (type) {
1881         case Kerberos:
1882                 sess_data->func = SMB2_auth_kerberos;
1883                 break;
1884         case RawNTLMSSP:
1885                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1886                 break;
1887         default:
1888                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1889                 return -EOPNOTSUPP;
1890         }
1891
1892         return 0;
1893 }
1894
1895 int
1896 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1897                 struct TCP_Server_Info *server,
1898                 const struct nls_table *nls_cp)
1899 {
1900         int rc = 0;
1901         struct SMB2_sess_data *sess_data;
1902
1903         cifs_dbg(FYI, "Session Setup\n");
1904
1905         if (!server) {
1906                 WARN(1, "%s: server is NULL!\n", __func__);
1907                 return -EIO;
1908         }
1909
1910         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1911         if (!sess_data)
1912                 return -ENOMEM;
1913
1914         sess_data->xid = xid;
1915         sess_data->ses = ses;
1916         sess_data->server = server;
1917         sess_data->buf0_type = CIFS_NO_BUFFER;
1918         sess_data->nls_cp = (struct nls_table *) nls_cp;
1919         sess_data->previous_session = ses->Suid;
1920
1921         rc = SMB2_select_sec(sess_data);
1922         if (rc)
1923                 goto out;
1924
1925         /*
1926          * Initialize the session hash with the server one.
1927          */
1928         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1929                SMB2_PREAUTH_HASH_SIZE);
1930
1931         while (sess_data->func)
1932                 sess_data->func(sess_data);
1933
1934         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1935                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1936         rc = sess_data->result;
1937 out:
1938         kfree_sensitive(sess_data);
1939         return rc;
1940 }
1941
1942 int
1943 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1944 {
1945         struct smb_rqst rqst;
1946         struct smb2_logoff_req *req; /* response is also trivial struct */
1947         int rc = 0;
1948         struct TCP_Server_Info *server;
1949         int flags = 0;
1950         unsigned int total_len;
1951         struct kvec iov[1];
1952         struct kvec rsp_iov;
1953         int resp_buf_type;
1954
1955         cifs_dbg(FYI, "disconnect session %p\n", ses);
1956
1957         if (ses && (ses->server))
1958                 server = ses->server;
1959         else
1960                 return -EIO;
1961
1962         /* no need to send SMB logoff if uid already closed due to reconnect */
1963         spin_lock(&ses->chan_lock);
1964         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1965                 spin_unlock(&ses->chan_lock);
1966                 goto smb2_session_already_dead;
1967         }
1968         spin_unlock(&ses->chan_lock);
1969
1970         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1971                                  (void **) &req, &total_len);
1972         if (rc)
1973                 return rc;
1974
1975          /* since no tcon, smb2_init can not do this, so do here */
1976         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1977
1978         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1979                 flags |= CIFS_TRANSFORM_REQ;
1980         else if (server->sign)
1981                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1982
1983         flags |= CIFS_NO_RSP_BUF;
1984
1985         iov[0].iov_base = (char *)req;
1986         iov[0].iov_len = total_len;
1987
1988         memset(&rqst, 0, sizeof(struct smb_rqst));
1989         rqst.rq_iov = iov;
1990         rqst.rq_nvec = 1;
1991
1992         rc = cifs_send_recv(xid, ses, ses->server,
1993                             &rqst, &resp_buf_type, flags, &rsp_iov);
1994         cifs_small_buf_release(req);
1995         /*
1996          * No tcon so can't do
1997          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1998          */
1999
2000 smb2_session_already_dead:
2001         return rc;
2002 }
2003
2004 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2005 {
2006         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2007 }
2008
2009 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2010
2011 /* These are similar values to what Windows uses */
2012 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2013 {
2014         tcon->max_chunks = 256;
2015         tcon->max_bytes_chunk = 1048576;
2016         tcon->max_bytes_copy = 16777216;
2017 }
2018
2019 int
2020 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2021           struct cifs_tcon *tcon, const struct nls_table *cp)
2022 {
2023         struct smb_rqst rqst;
2024         struct smb2_tree_connect_req *req;
2025         struct smb2_tree_connect_rsp *rsp = NULL;
2026         struct kvec iov[2];
2027         struct kvec rsp_iov = { NULL, 0 };
2028         int rc = 0;
2029         int resp_buftype;
2030         int unc_path_len;
2031         __le16 *unc_path = NULL;
2032         int flags = 0;
2033         unsigned int total_len;
2034         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2035
2036         cifs_dbg(FYI, "TCON\n");
2037
2038         if (!server || !tree)
2039                 return -EIO;
2040
2041         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2042         if (unc_path == NULL)
2043                 return -ENOMEM;
2044
2045         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2046         if (unc_path_len <= 0) {
2047                 kfree(unc_path);
2048                 return -EINVAL;
2049         }
2050         unc_path_len *= 2;
2051
2052         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2053         tcon->tid = 0;
2054         atomic_set(&tcon->num_remote_opens, 0);
2055         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2056                                  (void **) &req, &total_len);
2057         if (rc) {
2058                 kfree(unc_path);
2059                 return rc;
2060         }
2061
2062         if (smb3_encryption_required(tcon))
2063                 flags |= CIFS_TRANSFORM_REQ;
2064
2065         iov[0].iov_base = (char *)req;
2066         /* 1 for pad */
2067         iov[0].iov_len = total_len - 1;
2068
2069         /* Testing shows that buffer offset must be at location of Buffer[0] */
2070         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2071         req->PathLength = cpu_to_le16(unc_path_len);
2072         iov[1].iov_base = unc_path;
2073         iov[1].iov_len = unc_path_len;
2074
2075         /*
2076          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2077          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2078          * (Samba servers don't always set the flag so also check if null user)
2079          */
2080         if ((server->dialect == SMB311_PROT_ID) &&
2081             !smb3_encryption_required(tcon) &&
2082             !(ses->session_flags &
2083                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2084             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2085                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2086
2087         memset(&rqst, 0, sizeof(struct smb_rqst));
2088         rqst.rq_iov = iov;
2089         rqst.rq_nvec = 2;
2090
2091         /* Need 64 for max size write so ask for more in case not there yet */
2092         if (server->credits >= server->max_credits)
2093                 req->hdr.CreditRequest = cpu_to_le16(0);
2094         else
2095                 req->hdr.CreditRequest = cpu_to_le16(
2096                         min_t(int, server->max_credits -
2097                               server->credits, 64));
2098
2099         rc = cifs_send_recv(xid, ses, server,
2100                             &rqst, &resp_buftype, flags, &rsp_iov);
2101         cifs_small_buf_release(req);
2102         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2103         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2104         if ((rc != 0) || (rsp == NULL)) {
2105                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2106                 tcon->need_reconnect = true;
2107                 goto tcon_error_exit;
2108         }
2109
2110         switch (rsp->ShareType) {
2111         case SMB2_SHARE_TYPE_DISK:
2112                 cifs_dbg(FYI, "connection to disk share\n");
2113                 break;
2114         case SMB2_SHARE_TYPE_PIPE:
2115                 tcon->pipe = true;
2116                 cifs_dbg(FYI, "connection to pipe share\n");
2117                 break;
2118         case SMB2_SHARE_TYPE_PRINT:
2119                 tcon->print = true;
2120                 cifs_dbg(FYI, "connection to printer\n");
2121                 break;
2122         default:
2123                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2124                 rc = -EOPNOTSUPP;
2125                 goto tcon_error_exit;
2126         }
2127
2128         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2129         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2130         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2131         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2132         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2133
2134         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2135             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2136                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2137
2138         if (tcon->seal &&
2139             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2140                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2141
2142         init_copy_chunk_defaults(tcon);
2143         if (server->ops->validate_negotiate)
2144                 rc = server->ops->validate_negotiate(xid, tcon);
2145         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2146                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2147                         server->nosharesock = true;
2148 tcon_exit:
2149
2150         free_rsp_buf(resp_buftype, rsp);
2151         kfree(unc_path);
2152         return rc;
2153
2154 tcon_error_exit:
2155         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2156                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
2157         goto tcon_exit;
2158 }
2159
2160 int
2161 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2162 {
2163         struct smb_rqst rqst;
2164         struct smb2_tree_disconnect_req *req; /* response is trivial */
2165         int rc = 0;
2166         struct cifs_ses *ses = tcon->ses;
2167         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2168         int flags = 0;
2169         unsigned int total_len;
2170         struct kvec iov[1];
2171         struct kvec rsp_iov;
2172         int resp_buf_type;
2173
2174         cifs_dbg(FYI, "Tree Disconnect\n");
2175
2176         if (!ses || !(ses->server))
2177                 return -EIO;
2178
2179         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2180         spin_lock(&ses->chan_lock);
2181         if ((tcon->need_reconnect) ||
2182             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2183                 spin_unlock(&ses->chan_lock);
2184                 return 0;
2185         }
2186         spin_unlock(&ses->chan_lock);
2187
2188         invalidate_all_cached_dirs(tcon);
2189
2190         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2191                                  (void **) &req,
2192                                  &total_len);
2193         if (rc)
2194                 return rc;
2195
2196         if (smb3_encryption_required(tcon))
2197                 flags |= CIFS_TRANSFORM_REQ;
2198
2199         flags |= CIFS_NO_RSP_BUF;
2200
2201         iov[0].iov_base = (char *)req;
2202         iov[0].iov_len = total_len;
2203
2204         memset(&rqst, 0, sizeof(struct smb_rqst));
2205         rqst.rq_iov = iov;
2206         rqst.rq_nvec = 1;
2207
2208         rc = cifs_send_recv(xid, ses, server,
2209                             &rqst, &resp_buf_type, flags, &rsp_iov);
2210         cifs_small_buf_release(req);
2211         if (rc) {
2212                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2213                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2214         }
2215         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2216
2217         return rc;
2218 }
2219
2220
2221 static struct create_durable *
2222 create_durable_buf(void)
2223 {
2224         struct create_durable *buf;
2225
2226         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2227         if (!buf)
2228                 return NULL;
2229
2230         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2231                                         (struct create_durable, Data));
2232         buf->ccontext.DataLength = cpu_to_le32(16);
2233         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2234                                 (struct create_durable, Name));
2235         buf->ccontext.NameLength = cpu_to_le16(4);
2236         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2237         buf->Name[0] = 'D';
2238         buf->Name[1] = 'H';
2239         buf->Name[2] = 'n';
2240         buf->Name[3] = 'Q';
2241         return buf;
2242 }
2243
2244 static struct create_durable *
2245 create_reconnect_durable_buf(struct cifs_fid *fid)
2246 {
2247         struct create_durable *buf;
2248
2249         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2250         if (!buf)
2251                 return NULL;
2252
2253         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2254                                         (struct create_durable, Data));
2255         buf->ccontext.DataLength = cpu_to_le32(16);
2256         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2257                                 (struct create_durable, Name));
2258         buf->ccontext.NameLength = cpu_to_le16(4);
2259         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2260         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2261         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2262         buf->Name[0] = 'D';
2263         buf->Name[1] = 'H';
2264         buf->Name[2] = 'n';
2265         buf->Name[3] = 'C';
2266         return buf;
2267 }
2268
2269 static void
2270 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2271 {
2272         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2273
2274         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2275                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2276         buf->IndexNumber = pdisk_id->DiskFileId;
2277 }
2278
2279 static void
2280 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2281                  struct create_posix_rsp *posix)
2282 {
2283         int sid_len;
2284         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2285         u8 *end = beg + le32_to_cpu(cc->DataLength);
2286         u8 *sid;
2287
2288         memset(posix, 0, sizeof(*posix));
2289
2290         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2291         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2292         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2293
2294         sid = beg + 12;
2295         sid_len = posix_info_sid_size(sid, end);
2296         if (sid_len < 0) {
2297                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2298                 return;
2299         }
2300         memcpy(&posix->owner, sid, sid_len);
2301
2302         sid = sid + sid_len;
2303         sid_len = posix_info_sid_size(sid, end);
2304         if (sid_len < 0) {
2305                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2306                 return;
2307         }
2308         memcpy(&posix->group, sid, sid_len);
2309
2310         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2311                  posix->nlink, posix->mode, posix->reparse_tag);
2312 }
2313
2314 int smb2_parse_contexts(struct TCP_Server_Info *server,
2315                         struct kvec *rsp_iov,
2316                         unsigned int *epoch,
2317                         char *lease_key, __u8 *oplock,
2318                         struct smb2_file_all_info *buf,
2319                         struct create_posix_rsp *posix)
2320 {
2321         struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2322         struct create_context *cc;
2323         size_t rem, off, len;
2324         size_t doff, dlen;
2325         size_t noff, nlen;
2326         char *name;
2327         static const char smb3_create_tag_posix[] = {
2328                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2329                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2330                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2331         };
2332
2333         *oplock = 0;
2334
2335         off = le32_to_cpu(rsp->CreateContextsOffset);
2336         rem = le32_to_cpu(rsp->CreateContextsLength);
2337         if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2338                 return -EINVAL;
2339         cc = (struct create_context *)((u8 *)rsp + off);
2340
2341         /* Initialize inode number to 0 in case no valid data in qfid context */
2342         if (buf)
2343                 buf->IndexNumber = 0;
2344
2345         while (rem >= sizeof(*cc)) {
2346                 doff = le16_to_cpu(cc->DataOffset);
2347                 dlen = le32_to_cpu(cc->DataLength);
2348                 if (check_add_overflow(doff, dlen, &len) || len > rem)
2349                         return -EINVAL;
2350
2351                 noff = le16_to_cpu(cc->NameOffset);
2352                 nlen = le16_to_cpu(cc->NameLength);
2353                 if (noff + nlen > doff)
2354                         return -EINVAL;
2355
2356                 name = (char *)cc + noff;
2357                 switch (nlen) {
2358                 case 4:
2359                         if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2360                                 *oplock = server->ops->parse_lease_buf(cc, epoch,
2361                                                                        lease_key);
2362                         } else if (buf &&
2363                                    !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2364                                 parse_query_id_ctxt(cc, buf);
2365                         }
2366                         break;
2367                 case 16:
2368                         if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2369                                 parse_posix_ctxt(cc, buf, posix);
2370                         break;
2371                 default:
2372                         cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2373                                  __func__, nlen, dlen);
2374                         if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2375                                 cifs_dump_mem("context data: ", cc, dlen);
2376                         break;
2377                 }
2378
2379                 off = le32_to_cpu(cc->Next);
2380                 if (!off)
2381                         break;
2382                 if (check_sub_overflow(rem, off, &rem))
2383                         return -EINVAL;
2384                 cc = (struct create_context *)((u8 *)cc + off);
2385         }
2386
2387         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2388                 *oplock = rsp->OplockLevel;
2389
2390         return 0;
2391 }
2392
2393 static int
2394 add_lease_context(struct TCP_Server_Info *server,
2395                   struct smb2_create_req *req,
2396                   struct kvec *iov,
2397                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2398 {
2399         unsigned int num = *num_iovec;
2400
2401         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2402         if (iov[num].iov_base == NULL)
2403                 return -ENOMEM;
2404         iov[num].iov_len = server->vals->create_lease_size;
2405         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2406         *num_iovec = num + 1;
2407         return 0;
2408 }
2409
2410 static struct create_durable_v2 *
2411 create_durable_v2_buf(struct cifs_open_parms *oparms)
2412 {
2413         struct cifs_fid *pfid = oparms->fid;
2414         struct create_durable_v2 *buf;
2415
2416         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2417         if (!buf)
2418                 return NULL;
2419
2420         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2421                                         (struct create_durable_v2, dcontext));
2422         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2423         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2424                                 (struct create_durable_v2, Name));
2425         buf->ccontext.NameLength = cpu_to_le16(4);
2426
2427         /*
2428          * NB: Handle timeout defaults to 0, which allows server to choose
2429          * (most servers default to 120 seconds) and most clients default to 0.
2430          * This can be overridden at mount ("handletimeout=") if the user wants
2431          * a different persistent (or resilient) handle timeout for all opens
2432          * on a particular SMB3 mount.
2433          */
2434         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2435         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2436
2437         /* for replay, we should not overwrite the existing create guid */
2438         if (!oparms->replay) {
2439                 generate_random_uuid(buf->dcontext.CreateGuid);
2440                 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2441         } else
2442                 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2443
2444         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2445         buf->Name[0] = 'D';
2446         buf->Name[1] = 'H';
2447         buf->Name[2] = '2';
2448         buf->Name[3] = 'Q';
2449         return buf;
2450 }
2451
2452 static struct create_durable_handle_reconnect_v2 *
2453 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2454 {
2455         struct create_durable_handle_reconnect_v2 *buf;
2456
2457         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2458                         GFP_KERNEL);
2459         if (!buf)
2460                 return NULL;
2461
2462         buf->ccontext.DataOffset =
2463                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2464                                      dcontext));
2465         buf->ccontext.DataLength =
2466                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2467         buf->ccontext.NameOffset =
2468                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2469                             Name));
2470         buf->ccontext.NameLength = cpu_to_le16(4);
2471
2472         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2473         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2474         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2475         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2476
2477         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2478         buf->Name[0] = 'D';
2479         buf->Name[1] = 'H';
2480         buf->Name[2] = '2';
2481         buf->Name[3] = 'C';
2482         return buf;
2483 }
2484
2485 static int
2486 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2487                     struct cifs_open_parms *oparms)
2488 {
2489         unsigned int num = *num_iovec;
2490
2491         iov[num].iov_base = create_durable_v2_buf(oparms);
2492         if (iov[num].iov_base == NULL)
2493                 return -ENOMEM;
2494         iov[num].iov_len = sizeof(struct create_durable_v2);
2495         *num_iovec = num + 1;
2496         return 0;
2497 }
2498
2499 static int
2500 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2501                     struct cifs_open_parms *oparms)
2502 {
2503         unsigned int num = *num_iovec;
2504
2505         /* indicate that we don't need to relock the file */
2506         oparms->reconnect = false;
2507
2508         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2509         if (iov[num].iov_base == NULL)
2510                 return -ENOMEM;
2511         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2512         *num_iovec = num + 1;
2513         return 0;
2514 }
2515
2516 static int
2517 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2518                     struct cifs_open_parms *oparms, bool use_persistent)
2519 {
2520         unsigned int num = *num_iovec;
2521
2522         if (use_persistent) {
2523                 if (oparms->reconnect)
2524                         return add_durable_reconnect_v2_context(iov, num_iovec,
2525                                                                 oparms);
2526                 else
2527                         return add_durable_v2_context(iov, num_iovec, oparms);
2528         }
2529
2530         if (oparms->reconnect) {
2531                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2532                 /* indicate that we don't need to relock the file */
2533                 oparms->reconnect = false;
2534         } else
2535                 iov[num].iov_base = create_durable_buf();
2536         if (iov[num].iov_base == NULL)
2537                 return -ENOMEM;
2538         iov[num].iov_len = sizeof(struct create_durable);
2539         *num_iovec = num + 1;
2540         return 0;
2541 }
2542
2543 /* See MS-SMB2 2.2.13.2.7 */
2544 static struct crt_twarp_ctxt *
2545 create_twarp_buf(__u64 timewarp)
2546 {
2547         struct crt_twarp_ctxt *buf;
2548
2549         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2550         if (!buf)
2551                 return NULL;
2552
2553         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2554                                         (struct crt_twarp_ctxt, Timestamp));
2555         buf->ccontext.DataLength = cpu_to_le32(8);
2556         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2557                                 (struct crt_twarp_ctxt, Name));
2558         buf->ccontext.NameLength = cpu_to_le16(4);
2559         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2560         buf->Name[0] = 'T';
2561         buf->Name[1] = 'W';
2562         buf->Name[2] = 'r';
2563         buf->Name[3] = 'p';
2564         buf->Timestamp = cpu_to_le64(timewarp);
2565         return buf;
2566 }
2567
2568 /* See MS-SMB2 2.2.13.2.7 */
2569 static int
2570 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2571 {
2572         unsigned int num = *num_iovec;
2573
2574         iov[num].iov_base = create_twarp_buf(timewarp);
2575         if (iov[num].iov_base == NULL)
2576                 return -ENOMEM;
2577         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2578         *num_iovec = num + 1;
2579         return 0;
2580 }
2581
2582 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2583 static void setup_owner_group_sids(char *buf)
2584 {
2585         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2586
2587         /* Populate the user ownership fields S-1-5-88-1 */
2588         sids->owner.Revision = 1;
2589         sids->owner.NumAuth = 3;
2590         sids->owner.Authority[5] = 5;
2591         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2592         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2593         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2594
2595         /* Populate the group ownership fields S-1-5-88-2 */
2596         sids->group.Revision = 1;
2597         sids->group.NumAuth = 3;
2598         sids->group.Authority[5] = 5;
2599         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2600         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2601         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2602
2603         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2604 }
2605
2606 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2607 static struct crt_sd_ctxt *
2608 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2609 {
2610         struct crt_sd_ctxt *buf;
2611         __u8 *ptr, *aclptr;
2612         unsigned int acelen, acl_size, ace_count;
2613         unsigned int owner_offset = 0;
2614         unsigned int group_offset = 0;
2615         struct smb3_acl acl = {};
2616
2617         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2618
2619         if (set_owner) {
2620                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2621                 *len += sizeof(struct owner_group_sids);
2622         }
2623
2624         buf = kzalloc(*len, GFP_KERNEL);
2625         if (buf == NULL)
2626                 return buf;
2627
2628         ptr = (__u8 *)&buf[1];
2629         if (set_owner) {
2630                 /* offset fields are from beginning of security descriptor not of create context */
2631                 owner_offset = ptr - (__u8 *)&buf->sd;
2632                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2633                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2634                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2635
2636                 setup_owner_group_sids(ptr);
2637                 ptr += sizeof(struct owner_group_sids);
2638         } else {
2639                 buf->sd.OffsetOwner = 0;
2640                 buf->sd.OffsetGroup = 0;
2641         }
2642
2643         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2644         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2645         buf->ccontext.NameLength = cpu_to_le16(4);
2646         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2647         buf->Name[0] = 'S';
2648         buf->Name[1] = 'e';
2649         buf->Name[2] = 'c';
2650         buf->Name[3] = 'D';
2651         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2652
2653         /*
2654          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2655          * and "DP" ie the DACL is present
2656          */
2657         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2658
2659         /* offset owner, group and Sbz1 and SACL are all zero */
2660         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2661         /* Ship the ACL for now. we will copy it into buf later. */
2662         aclptr = ptr;
2663         ptr += sizeof(struct smb3_acl);
2664
2665         /* create one ACE to hold the mode embedded in reserved special SID */
2666         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2667         ptr += acelen;
2668         acl_size = acelen + sizeof(struct smb3_acl);
2669         ace_count = 1;
2670
2671         if (set_owner) {
2672                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2673                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2674                 ptr += acelen;
2675                 acl_size += acelen;
2676                 ace_count += 1;
2677         }
2678
2679         /* and one more ACE to allow access for authenticated users */
2680         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2681         ptr += acelen;
2682         acl_size += acelen;
2683         ace_count += 1;
2684
2685         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2686         acl.AclSize = cpu_to_le16(acl_size);
2687         acl.AceCount = cpu_to_le16(ace_count);
2688         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2689         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2690
2691         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2692         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2693
2694         return buf;
2695 }
2696
2697 static int
2698 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2699 {
2700         unsigned int num = *num_iovec;
2701         unsigned int len = 0;
2702
2703         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2704         if (iov[num].iov_base == NULL)
2705                 return -ENOMEM;
2706         iov[num].iov_len = len;
2707         *num_iovec = num + 1;
2708         return 0;
2709 }
2710
2711 static struct crt_query_id_ctxt *
2712 create_query_id_buf(void)
2713 {
2714         struct crt_query_id_ctxt *buf;
2715
2716         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2717         if (!buf)
2718                 return NULL;
2719
2720         buf->ccontext.DataOffset = cpu_to_le16(0);
2721         buf->ccontext.DataLength = cpu_to_le32(0);
2722         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2723                                 (struct crt_query_id_ctxt, Name));
2724         buf->ccontext.NameLength = cpu_to_le16(4);
2725         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2726         buf->Name[0] = 'Q';
2727         buf->Name[1] = 'F';
2728         buf->Name[2] = 'i';
2729         buf->Name[3] = 'd';
2730         return buf;
2731 }
2732
2733 /* See MS-SMB2 2.2.13.2.9 */
2734 static int
2735 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2736 {
2737         unsigned int num = *num_iovec;
2738
2739         iov[num].iov_base = create_query_id_buf();
2740         if (iov[num].iov_base == NULL)
2741                 return -ENOMEM;
2742         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2743         *num_iovec = num + 1;
2744         return 0;
2745 }
2746
2747 static void add_ea_context(struct cifs_open_parms *oparms,
2748                            struct kvec *rq_iov, unsigned int *num_iovs)
2749 {
2750         struct kvec *iov = oparms->ea_cctx;
2751
2752         if (iov && iov->iov_base && iov->iov_len) {
2753                 rq_iov[(*num_iovs)++] = *iov;
2754                 memset(iov, 0, sizeof(*iov));
2755         }
2756 }
2757
2758 static int
2759 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2760                             const char *treename, const __le16 *path)
2761 {
2762         int treename_len, path_len;
2763         struct nls_table *cp;
2764         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2765
2766         /*
2767          * skip leading "\\"
2768          */
2769         treename_len = strlen(treename);
2770         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2771                 return -EINVAL;
2772
2773         treename += 2;
2774         treename_len -= 2;
2775
2776         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2777
2778         /* make room for one path separator only if @path isn't empty */
2779         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2780
2781         /*
2782          * final path needs to be 8-byte aligned as specified in
2783          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2784          */
2785         *out_size = round_up(*out_len * sizeof(__le16), 8);
2786         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2787         if (!*out_path)
2788                 return -ENOMEM;
2789
2790         cp = load_nls_default();
2791         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2792
2793         /* Do not append the separator if the path is empty */
2794         if (path[0] != cpu_to_le16(0x0000)) {
2795                 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2796                 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2797         }
2798
2799         unload_nls(cp);
2800
2801         return 0;
2802 }
2803
2804 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2805                                umode_t mode, struct cifs_tcon *tcon,
2806                                const char *full_path,
2807                                struct cifs_sb_info *cifs_sb)
2808 {
2809         struct smb_rqst rqst;
2810         struct smb2_create_req *req;
2811         struct smb2_create_rsp *rsp = NULL;
2812         struct cifs_ses *ses = tcon->ses;
2813         struct kvec iov[3]; /* make sure at least one for each open context */
2814         struct kvec rsp_iov = {NULL, 0};
2815         int resp_buftype;
2816         int uni_path_len;
2817         __le16 *copy_path = NULL;
2818         int copy_size;
2819         int rc = 0;
2820         unsigned int n_iov = 2;
2821         __u32 file_attributes = 0;
2822         char *pc_buf = NULL;
2823         int flags = 0;
2824         unsigned int total_len;
2825         __le16 *utf16_path = NULL;
2826         struct TCP_Server_Info *server;
2827         int retries = 0, cur_sleep = 1;
2828
2829 replay_again:
2830         /* reinitialize for possible replay */
2831         flags = 0;
2832         n_iov = 2;
2833         server = cifs_pick_channel(ses);
2834
2835         cifs_dbg(FYI, "mkdir\n");
2836
2837         /* resource #1: path allocation */
2838         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2839         if (!utf16_path)
2840                 return -ENOMEM;
2841
2842         if (!ses || !server) {
2843                 rc = -EIO;
2844                 goto err_free_path;
2845         }
2846
2847         /* resource #2: request */
2848         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2849                                  (void **) &req, &total_len);
2850         if (rc)
2851                 goto err_free_path;
2852
2853
2854         if (smb3_encryption_required(tcon))
2855                 flags |= CIFS_TRANSFORM_REQ;
2856
2857         req->ImpersonationLevel = IL_IMPERSONATION;
2858         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2859         /* File attributes ignored on open (used in create though) */
2860         req->FileAttributes = cpu_to_le32(file_attributes);
2861         req->ShareAccess = FILE_SHARE_ALL_LE;
2862         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2863         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2864
2865         iov[0].iov_base = (char *)req;
2866         /* -1 since last byte is buf[0] which is sent below (path) */
2867         iov[0].iov_len = total_len - 1;
2868
2869         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2870
2871         /* [MS-SMB2] 2.2.13 NameOffset:
2872          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2873          * the SMB2 header, the file name includes a prefix that will
2874          * be processed during DFS name normalization as specified in
2875          * section 3.3.5.9. Otherwise, the file name is relative to
2876          * the share that is identified by the TreeId in the SMB2
2877          * header.
2878          */
2879         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2880                 int name_len;
2881
2882                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2883                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2884                                                  &name_len,
2885                                                  tcon->tree_name, utf16_path);
2886                 if (rc)
2887                         goto err_free_req;
2888
2889                 req->NameLength = cpu_to_le16(name_len * 2);
2890                 uni_path_len = copy_size;
2891                 /* free before overwriting resource */
2892                 kfree(utf16_path);
2893                 utf16_path = copy_path;
2894         } else {
2895                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2896                 /* MUST set path len (NameLength) to 0 opening root of share */
2897                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2898                 if (uni_path_len % 8 != 0) {
2899                         copy_size = roundup(uni_path_len, 8);
2900                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2901                         if (!copy_path) {
2902                                 rc = -ENOMEM;
2903                                 goto err_free_req;
2904                         }
2905                         memcpy((char *)copy_path, (const char *)utf16_path,
2906                                uni_path_len);
2907                         uni_path_len = copy_size;
2908                         /* free before overwriting resource */
2909                         kfree(utf16_path);
2910                         utf16_path = copy_path;
2911                 }
2912         }
2913
2914         iov[1].iov_len = uni_path_len;
2915         iov[1].iov_base = utf16_path;
2916         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2917
2918         if (tcon->posix_extensions) {
2919                 /* resource #3: posix buf */
2920                 rc = add_posix_context(iov, &n_iov, mode);
2921                 if (rc)
2922                         goto err_free_req;
2923                 req->CreateContextsOffset = cpu_to_le32(
2924                         sizeof(struct smb2_create_req) +
2925                         iov[1].iov_len);
2926                 pc_buf = iov[n_iov-1].iov_base;
2927         }
2928
2929
2930         memset(&rqst, 0, sizeof(struct smb_rqst));
2931         rqst.rq_iov = iov;
2932         rqst.rq_nvec = n_iov;
2933
2934         /* no need to inc num_remote_opens because we close it just below */
2935         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2936                                     FILE_WRITE_ATTRIBUTES);
2937
2938         if (retries)
2939                 smb2_set_replay(server, &rqst);
2940
2941         /* resource #4: response buffer */
2942         rc = cifs_send_recv(xid, ses, server,
2943                             &rqst, &resp_buftype, flags, &rsp_iov);
2944         if (rc) {
2945                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2946                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2947                                            CREATE_NOT_FILE,
2948                                            FILE_WRITE_ATTRIBUTES, rc);
2949                 goto err_free_rsp_buf;
2950         }
2951
2952         /*
2953          * Although unlikely to be possible for rsp to be null and rc not set,
2954          * adding check below is slightly safer long term (and quiets Coverity
2955          * warning)
2956          */
2957         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2958         if (rsp == NULL) {
2959                 rc = -EIO;
2960                 kfree(pc_buf);
2961                 goto err_free_req;
2962         }
2963
2964         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2965                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2966
2967         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2968
2969         /* Eventually save off posix specific response info and timestaps */
2970
2971 err_free_rsp_buf:
2972         free_rsp_buf(resp_buftype, rsp);
2973         kfree(pc_buf);
2974 err_free_req:
2975         cifs_small_buf_release(req);
2976 err_free_path:
2977         kfree(utf16_path);
2978
2979         if (is_replayable_error(rc) &&
2980             smb2_should_replay(tcon, &retries, &cur_sleep))
2981                 goto replay_again;
2982
2983         return rc;
2984 }
2985
2986 int
2987 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2988                struct smb_rqst *rqst, __u8 *oplock,
2989                struct cifs_open_parms *oparms, __le16 *path)
2990 {
2991         struct smb2_create_req *req;
2992         unsigned int n_iov = 2;
2993         __u32 file_attributes = 0;
2994         int copy_size;
2995         int uni_path_len;
2996         unsigned int total_len;
2997         struct kvec *iov = rqst->rq_iov;
2998         __le16 *copy_path;
2999         int rc;
3000
3001         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3002                                  (void **) &req, &total_len);
3003         if (rc)
3004                 return rc;
3005
3006         iov[0].iov_base = (char *)req;
3007         /* -1 since last byte is buf[0] which is sent below (path) */
3008         iov[0].iov_len = total_len - 1;
3009
3010         if (oparms->create_options & CREATE_OPTION_READONLY)
3011                 file_attributes |= ATTR_READONLY;
3012         if (oparms->create_options & CREATE_OPTION_SPECIAL)
3013                 file_attributes |= ATTR_SYSTEM;
3014
3015         req->ImpersonationLevel = IL_IMPERSONATION;
3016         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3017         /* File attributes ignored on open (used in create though) */
3018         req->FileAttributes = cpu_to_le32(file_attributes);
3019         req->ShareAccess = FILE_SHARE_ALL_LE;
3020
3021         req->CreateDisposition = cpu_to_le32(oparms->disposition);
3022         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3023         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3024
3025         /* [MS-SMB2] 2.2.13 NameOffset:
3026          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3027          * the SMB2 header, the file name includes a prefix that will
3028          * be processed during DFS name normalization as specified in
3029          * section 3.3.5.9. Otherwise, the file name is relative to
3030          * the share that is identified by the TreeId in the SMB2
3031          * header.
3032          */
3033         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3034                 int name_len;
3035
3036                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3037                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3038                                                  &name_len,
3039                                                  tcon->tree_name, path);
3040                 if (rc)
3041                         return rc;
3042                 req->NameLength = cpu_to_le16(name_len * 2);
3043                 uni_path_len = copy_size;
3044                 path = copy_path;
3045         } else {
3046                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3047                 /* MUST set path len (NameLength) to 0 opening root of share */
3048                 req->NameLength = cpu_to_le16(uni_path_len - 2);
3049                 copy_size = round_up(uni_path_len, 8);
3050                 copy_path = kzalloc(copy_size, GFP_KERNEL);
3051                 if (!copy_path)
3052                         return -ENOMEM;
3053                 memcpy((char *)copy_path, (const char *)path,
3054                        uni_path_len);
3055                 uni_path_len = copy_size;
3056                 path = copy_path;
3057         }
3058
3059         iov[1].iov_len = uni_path_len;
3060         iov[1].iov_base = path;
3061
3062         if ((!server->oplocks) || (tcon->no_lease))
3063                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
3064
3065         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3066             *oplock == SMB2_OPLOCK_LEVEL_NONE)
3067                 req->RequestedOplockLevel = *oplock;
3068         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3069                   (oparms->create_options & CREATE_NOT_FILE))
3070                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
3071         else {
3072                 rc = add_lease_context(server, req, iov, &n_iov,
3073                                        oparms->fid->lease_key, oplock);
3074                 if (rc)
3075                         return rc;
3076         }
3077
3078         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3079                 rc = add_durable_context(iov, &n_iov, oparms,
3080                                         tcon->use_persistent);
3081                 if (rc)
3082                         return rc;
3083         }
3084
3085         if (tcon->posix_extensions) {
3086                 rc = add_posix_context(iov, &n_iov, oparms->mode);
3087                 if (rc)
3088                         return rc;
3089         }
3090
3091         if (tcon->snapshot_time) {
3092                 cifs_dbg(FYI, "adding snapshot context\n");
3093                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3094                 if (rc)
3095                         return rc;
3096         }
3097
3098         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3099                 bool set_mode;
3100                 bool set_owner;
3101
3102                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3103                     (oparms->mode != ACL_NO_MODE))
3104                         set_mode = true;
3105                 else {
3106                         set_mode = false;
3107                         oparms->mode = ACL_NO_MODE;
3108                 }
3109
3110                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3111                         set_owner = true;
3112                 else
3113                         set_owner = false;
3114
3115                 if (set_owner | set_mode) {
3116                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3117                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3118                         if (rc)
3119                                 return rc;
3120                 }
3121         }
3122
3123         add_query_id_context(iov, &n_iov);
3124         add_ea_context(oparms, iov, &n_iov);
3125
3126         if (n_iov > 2) {
3127                 /*
3128                  * We have create contexts behind iov[1] (the file
3129                  * name), point at them from the main create request
3130                  */
3131                 req->CreateContextsOffset = cpu_to_le32(
3132                         sizeof(struct smb2_create_req) +
3133                         iov[1].iov_len);
3134                 req->CreateContextsLength = 0;
3135
3136                 for (unsigned int i = 2; i < (n_iov-1); i++) {
3137                         struct kvec *v = &iov[i];
3138                         size_t len = v->iov_len;
3139                         struct create_context *cctx =
3140                                 (struct create_context *)v->iov_base;
3141
3142                         cctx->Next = cpu_to_le32(len);
3143                         le32_add_cpu(&req->CreateContextsLength, len);
3144                 }
3145                 le32_add_cpu(&req->CreateContextsLength,
3146                              iov[n_iov-1].iov_len);
3147         }
3148
3149         rqst->rq_nvec = n_iov;
3150         return 0;
3151 }
3152
3153 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3154  * All other vectors are freed by kfree().
3155  */
3156 void
3157 SMB2_open_free(struct smb_rqst *rqst)
3158 {
3159         int i;
3160
3161         if (rqst && rqst->rq_iov) {
3162                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3163                 for (i = 1; i < rqst->rq_nvec; i++)
3164                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3165                                 kfree(rqst->rq_iov[i].iov_base);
3166         }
3167 }
3168
3169 int
3170 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3171           __u8 *oplock, struct smb2_file_all_info *buf,
3172           struct create_posix_rsp *posix,
3173           struct kvec *err_iov, int *buftype)
3174 {
3175         struct smb_rqst rqst;
3176         struct smb2_create_rsp *rsp = NULL;
3177         struct cifs_tcon *tcon = oparms->tcon;
3178         struct cifs_ses *ses = tcon->ses;
3179         struct TCP_Server_Info *server;
3180         struct kvec iov[SMB2_CREATE_IOV_SIZE];
3181         struct kvec rsp_iov = {NULL, 0};
3182         int resp_buftype = CIFS_NO_BUFFER;
3183         int rc = 0;
3184         int flags = 0;
3185         int retries = 0, cur_sleep = 1;
3186
3187 replay_again:
3188         /* reinitialize for possible replay */
3189         flags = 0;
3190         server = cifs_pick_channel(ses);
3191         oparms->replay = !!(retries);
3192
3193         cifs_dbg(FYI, "create/open\n");
3194         if (!ses || !server)
3195                 return -EIO;
3196
3197         if (smb3_encryption_required(tcon))
3198                 flags |= CIFS_TRANSFORM_REQ;
3199
3200         memset(&rqst, 0, sizeof(struct smb_rqst));
3201         memset(&iov, 0, sizeof(iov));
3202         rqst.rq_iov = iov;
3203         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3204
3205         rc = SMB2_open_init(tcon, server,
3206                             &rqst, oplock, oparms, path);
3207         if (rc)
3208                 goto creat_exit;
3209
3210         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3211                 oparms->create_options, oparms->desired_access);
3212
3213         if (retries)
3214                 smb2_set_replay(server, &rqst);
3215
3216         rc = cifs_send_recv(xid, ses, server,
3217                             &rqst, &resp_buftype, flags,
3218                             &rsp_iov);
3219         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3220
3221         if (rc != 0) {
3222                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3223                 if (err_iov && rsp) {
3224                         *err_iov = rsp_iov;
3225                         *buftype = resp_buftype;
3226                         resp_buftype = CIFS_NO_BUFFER;
3227                         rsp = NULL;
3228                 }
3229                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3230                                     oparms->create_options, oparms->desired_access, rc);
3231                 if (rc == -EREMCHG) {
3232                         pr_warn_once("server share %s deleted\n",
3233                                      tcon->tree_name);
3234                         tcon->need_reconnect = true;
3235                 }
3236                 goto creat_exit;
3237         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3238                 goto creat_exit;
3239         else
3240                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3241                                      oparms->create_options, oparms->desired_access);
3242
3243         atomic_inc(&tcon->num_remote_opens);
3244         oparms->fid->persistent_fid = rsp->PersistentFileId;
3245         oparms->fid->volatile_fid = rsp->VolatileFileId;
3246         oparms->fid->access = oparms->desired_access;
3247 #ifdef CONFIG_CIFS_DEBUG2
3248         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3249 #endif /* CIFS_DEBUG2 */
3250
3251         if (buf) {
3252                 buf->CreationTime = rsp->CreationTime;
3253                 buf->LastAccessTime = rsp->LastAccessTime;
3254                 buf->LastWriteTime = rsp->LastWriteTime;
3255                 buf->ChangeTime = rsp->ChangeTime;
3256                 buf->AllocationSize = rsp->AllocationSize;
3257                 buf->EndOfFile = rsp->EndofFile;
3258                 buf->Attributes = rsp->FileAttributes;
3259                 buf->NumberOfLinks = cpu_to_le32(1);
3260                 buf->DeletePending = 0;
3261         }
3262
3263
3264         rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3265                                  oparms->fid->lease_key, oplock, buf, posix);
3266 creat_exit:
3267         SMB2_open_free(&rqst);
3268         free_rsp_buf(resp_buftype, rsp);
3269
3270         if (is_replayable_error(rc) &&
3271             smb2_should_replay(tcon, &retries, &cur_sleep))
3272                 goto replay_again;
3273
3274         return rc;
3275 }
3276
3277 int
3278 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3279                 struct smb_rqst *rqst,
3280                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3281                 char *in_data, u32 indatalen,
3282                 __u32 max_response_size)
3283 {
3284         struct smb2_ioctl_req *req;
3285         struct kvec *iov = rqst->rq_iov;
3286         unsigned int total_len;
3287         int rc;
3288         char *in_data_buf;
3289
3290         rc = smb2_ioctl_req_init(opcode, tcon, server,
3291                                  (void **) &req, &total_len);
3292         if (rc)
3293                 return rc;
3294
3295         if (indatalen) {
3296                 /*
3297                  * indatalen is usually small at a couple of bytes max, so
3298                  * just allocate through generic pool
3299                  */
3300                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3301                 if (!in_data_buf) {
3302                         cifs_small_buf_release(req);
3303                         return -ENOMEM;
3304                 }
3305         }
3306
3307         req->CtlCode = cpu_to_le32(opcode);
3308         req->PersistentFileId = persistent_fid;
3309         req->VolatileFileId = volatile_fid;
3310
3311         iov[0].iov_base = (char *)req;
3312         /*
3313          * If no input data, the size of ioctl struct in
3314          * protocol spec still includes a 1 byte data buffer,
3315          * but if input data passed to ioctl, we do not
3316          * want to double count this, so we do not send
3317          * the dummy one byte of data in iovec[0] if sending
3318          * input data (in iovec[1]).
3319          */
3320         if (indatalen) {
3321                 req->InputCount = cpu_to_le32(indatalen);
3322                 /* do not set InputOffset if no input data */
3323                 req->InputOffset =
3324                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3325                 rqst->rq_nvec = 2;
3326                 iov[0].iov_len = total_len - 1;
3327                 iov[1].iov_base = in_data_buf;
3328                 iov[1].iov_len = indatalen;
3329         } else {
3330                 rqst->rq_nvec = 1;
3331                 iov[0].iov_len = total_len;
3332         }
3333
3334         req->OutputOffset = 0;
3335         req->OutputCount = 0; /* MBZ */
3336
3337         /*
3338          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3339          * We Could increase default MaxOutputResponse, but that could require
3340          * more credits. Windows typically sets this smaller, but for some
3341          * ioctls it may be useful to allow server to send more. No point
3342          * limiting what the server can send as long as fits in one credit
3343          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3344          * to increase this limit up in the future.
3345          * Note that for snapshot queries that servers like Azure expect that
3346          * the first query be minimal size (and just used to get the number/size
3347          * of previous versions) so response size must be specified as EXACTLY
3348          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3349          * of eight bytes.  Currently that is the only case where we set max
3350          * response size smaller.
3351          */
3352         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3353         req->hdr.CreditCharge =
3354                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3355                                          SMB2_MAX_BUFFER_SIZE));
3356         /* always an FSCTL (for now) */
3357         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3358
3359         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3360         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3361                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3362
3363         return 0;
3364 }
3365
3366 void
3367 SMB2_ioctl_free(struct smb_rqst *rqst)
3368 {
3369         int i;
3370
3371         if (rqst && rqst->rq_iov) {
3372                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3373                 for (i = 1; i < rqst->rq_nvec; i++)
3374                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3375                                 kfree(rqst->rq_iov[i].iov_base);
3376         }
3377 }
3378
3379
3380 /*
3381  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3382  */
3383 int
3384 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3385            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3386            u32 max_out_data_len, char **out_data,
3387            u32 *plen /* returned data len */)
3388 {
3389         struct smb_rqst rqst;
3390         struct smb2_ioctl_rsp *rsp = NULL;
3391         struct cifs_ses *ses;
3392         struct TCP_Server_Info *server;
3393         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3394         struct kvec rsp_iov = {NULL, 0};
3395         int resp_buftype = CIFS_NO_BUFFER;
3396         int rc = 0;
3397         int flags = 0;
3398         int retries = 0, cur_sleep = 1;
3399
3400         if (!tcon)
3401                 return -EIO;
3402
3403         ses = tcon->ses;
3404         if (!ses)
3405                 return -EIO;
3406
3407 replay_again:
3408         /* reinitialize for possible replay */
3409         flags = 0;
3410         server = cifs_pick_channel(ses);
3411
3412         if (!server)
3413                 return -EIO;
3414
3415         cifs_dbg(FYI, "SMB2 IOCTL\n");
3416
3417         if (out_data != NULL)
3418                 *out_data = NULL;
3419
3420         /* zero out returned data len, in case of error */
3421         if (plen)
3422                 *plen = 0;
3423
3424         if (smb3_encryption_required(tcon))
3425                 flags |= CIFS_TRANSFORM_REQ;
3426
3427         memset(&rqst, 0, sizeof(struct smb_rqst));
3428         memset(&iov, 0, sizeof(iov));
3429         rqst.rq_iov = iov;
3430         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3431
3432         rc = SMB2_ioctl_init(tcon, server,
3433                              &rqst, persistent_fid, volatile_fid, opcode,
3434                              in_data, indatalen, max_out_data_len);
3435         if (rc)
3436                 goto ioctl_exit;
3437
3438         if (retries)
3439                 smb2_set_replay(server, &rqst);
3440
3441         rc = cifs_send_recv(xid, ses, server,
3442                             &rqst, &resp_buftype, flags,
3443                             &rsp_iov);
3444         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3445
3446         if (rc != 0)
3447                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3448                                 ses->Suid, 0, opcode, rc);
3449
3450         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3451                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3452                 goto ioctl_exit;
3453         } else if (rc == -EINVAL) {
3454                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3455                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3456                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3457                         goto ioctl_exit;
3458                 }
3459         } else if (rc == -E2BIG) {
3460                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3461                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3462                         goto ioctl_exit;
3463                 }
3464         }
3465
3466         /* check if caller wants to look at return data or just return rc */
3467         if ((plen == NULL) || (out_data == NULL))
3468                 goto ioctl_exit;
3469
3470         /*
3471          * Although unlikely to be possible for rsp to be null and rc not set,
3472          * adding check below is slightly safer long term (and quiets Coverity
3473          * warning)
3474          */
3475         if (rsp == NULL) {
3476                 rc = -EIO;
3477                 goto ioctl_exit;
3478         }
3479
3480         *plen = le32_to_cpu(rsp->OutputCount);
3481
3482         /* We check for obvious errors in the output buffer length and offset */
3483         if (*plen == 0)
3484                 goto ioctl_exit; /* server returned no data */
3485         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3486                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3487                 *plen = 0;
3488                 rc = -EIO;
3489                 goto ioctl_exit;
3490         }
3491
3492         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3493                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3494                         le32_to_cpu(rsp->OutputOffset));
3495                 *plen = 0;
3496                 rc = -EIO;
3497                 goto ioctl_exit;
3498         }
3499
3500         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3501                             *plen, GFP_KERNEL);
3502         if (*out_data == NULL) {
3503                 rc = -ENOMEM;
3504                 goto ioctl_exit;
3505         }
3506
3507 ioctl_exit:
3508         SMB2_ioctl_free(&rqst);
3509         free_rsp_buf(resp_buftype, rsp);
3510
3511         if (is_replayable_error(rc) &&
3512             smb2_should_replay(tcon, &retries, &cur_sleep))
3513                 goto replay_again;
3514
3515         return rc;
3516 }
3517
3518 /*
3519  *   Individual callers to ioctl worker function follow
3520  */
3521
3522 int
3523 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3524                      u64 persistent_fid, u64 volatile_fid)
3525 {
3526         int rc;
3527         struct  compress_ioctl fsctl_input;
3528         char *ret_data = NULL;
3529
3530         fsctl_input.CompressionState =
3531                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3532
3533         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3534                         FSCTL_SET_COMPRESSION,
3535                         (char *)&fsctl_input /* data input */,
3536                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3537                         &ret_data /* out data */, NULL);
3538
3539         cifs_dbg(FYI, "set compression rc %d\n", rc);
3540
3541         return rc;
3542 }
3543
3544 int
3545 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3546                 struct smb_rqst *rqst,
3547                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3548 {
3549         struct smb2_close_req *req;
3550         struct kvec *iov = rqst->rq_iov;
3551         unsigned int total_len;
3552         int rc;
3553
3554         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3555                                  (void **) &req, &total_len);
3556         if (rc)
3557                 return rc;
3558
3559         req->PersistentFileId = persistent_fid;
3560         req->VolatileFileId = volatile_fid;
3561         if (query_attrs)
3562                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3563         else
3564                 req->Flags = 0;
3565         iov[0].iov_base = (char *)req;
3566         iov[0].iov_len = total_len;
3567
3568         return 0;
3569 }
3570
3571 void
3572 SMB2_close_free(struct smb_rqst *rqst)
3573 {
3574         if (rqst && rqst->rq_iov)
3575                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3576 }
3577
3578 int
3579 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3580              u64 persistent_fid, u64 volatile_fid,
3581              struct smb2_file_network_open_info *pbuf)
3582 {
3583         struct smb_rqst rqst;
3584         struct smb2_close_rsp *rsp = NULL;
3585         struct cifs_ses *ses = tcon->ses;
3586         struct TCP_Server_Info *server;
3587         struct kvec iov[1];
3588         struct kvec rsp_iov;
3589         int resp_buftype = CIFS_NO_BUFFER;
3590         int rc = 0;
3591         int flags = 0;
3592         bool query_attrs = false;
3593         int retries = 0, cur_sleep = 1;
3594
3595 replay_again:
3596         /* reinitialize for possible replay */
3597         flags = 0;
3598         query_attrs = false;
3599         server = cifs_pick_channel(ses);
3600
3601         cifs_dbg(FYI, "Close\n");
3602
3603         if (!ses || !server)
3604                 return -EIO;
3605
3606         if (smb3_encryption_required(tcon))
3607                 flags |= CIFS_TRANSFORM_REQ;
3608
3609         memset(&rqst, 0, sizeof(struct smb_rqst));
3610         memset(&iov, 0, sizeof(iov));
3611         rqst.rq_iov = iov;
3612         rqst.rq_nvec = 1;
3613
3614         /* check if need to ask server to return timestamps in close response */
3615         if (pbuf)
3616                 query_attrs = true;
3617
3618         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3619         rc = SMB2_close_init(tcon, server,
3620                              &rqst, persistent_fid, volatile_fid,
3621                              query_attrs);
3622         if (rc)
3623                 goto close_exit;
3624
3625         if (retries)
3626                 smb2_set_replay(server, &rqst);
3627
3628         rc = cifs_send_recv(xid, ses, server,
3629                             &rqst, &resp_buftype, flags, &rsp_iov);
3630         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3631
3632         if (rc != 0) {
3633                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3634                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3635                                      rc);
3636                 goto close_exit;
3637         } else {
3638                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3639                                       ses->Suid);
3640                 if (pbuf)
3641                         memcpy(&pbuf->network_open_info,
3642                                &rsp->network_open_info,
3643                                sizeof(pbuf->network_open_info));
3644                 atomic_dec(&tcon->num_remote_opens);
3645         }
3646
3647 close_exit:
3648         SMB2_close_free(&rqst);
3649         free_rsp_buf(resp_buftype, rsp);
3650
3651         /* retry close in a worker thread if this one is interrupted */
3652         if (is_interrupt_error(rc)) {
3653                 int tmp_rc;
3654
3655                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3656                                                      volatile_fid);
3657                 if (tmp_rc)
3658                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3659                                  persistent_fid, tmp_rc);
3660         }
3661
3662         if (is_replayable_error(rc) &&
3663             smb2_should_replay(tcon, &retries, &cur_sleep))
3664                 goto replay_again;
3665
3666         return rc;
3667 }
3668
3669 int
3670 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3671                 u64 persistent_fid, u64 volatile_fid)
3672 {
3673         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3674 }
3675
3676 int
3677 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3678                   struct kvec *iov, unsigned int min_buf_size)
3679 {
3680         unsigned int smb_len = iov->iov_len;
3681         char *end_of_smb = smb_len + (char *)iov->iov_base;
3682         char *begin_of_buf = offset + (char *)iov->iov_base;
3683         char *end_of_buf = begin_of_buf + buffer_length;
3684
3685
3686         if (buffer_length < min_buf_size) {
3687                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3688                          buffer_length, min_buf_size);
3689                 return -EINVAL;
3690         }
3691
3692         /* check if beyond RFC1001 maximum length */
3693         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3694                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3695                          buffer_length, smb_len);
3696                 return -EINVAL;
3697         }
3698
3699         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3700                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3701                 return -EINVAL;
3702         }
3703
3704         return 0;
3705 }
3706
3707 /*
3708  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3709  * Caller must free buffer.
3710  */
3711 int
3712 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3713                            struct kvec *iov, unsigned int minbufsize,
3714                            char *data)
3715 {
3716         char *begin_of_buf = offset + (char *)iov->iov_base;
3717         int rc;
3718
3719         if (!data)
3720                 return -EINVAL;
3721
3722         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3723         if (rc)
3724                 return rc;
3725
3726         memcpy(data, begin_of_buf, minbufsize);
3727
3728         return 0;
3729 }
3730
3731 int
3732 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3733                      struct smb_rqst *rqst,
3734                      u64 persistent_fid, u64 volatile_fid,
3735                      u8 info_class, u8 info_type, u32 additional_info,
3736                      size_t output_len, size_t input_len, void *input)
3737 {
3738         struct smb2_query_info_req *req;
3739         struct kvec *iov = rqst->rq_iov;
3740         unsigned int total_len;
3741         size_t len;
3742         int rc;
3743
3744         if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3745                      len > CIFSMaxBufSize))
3746                 return -EINVAL;
3747
3748         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3749                                  (void **) &req, &total_len);
3750         if (rc)
3751                 return rc;
3752
3753         req->InfoType = info_type;
3754         req->FileInfoClass = info_class;
3755         req->PersistentFileId = persistent_fid;
3756         req->VolatileFileId = volatile_fid;
3757         req->AdditionalInformation = cpu_to_le32(additional_info);
3758
3759         req->OutputBufferLength = cpu_to_le32(output_len);
3760         if (input_len) {
3761                 req->InputBufferLength = cpu_to_le32(input_len);
3762                 /* total_len for smb query request never close to le16 max */
3763                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3764                 memcpy(req->Buffer, input, input_len);
3765         }
3766
3767         iov[0].iov_base = (char *)req;
3768         /* 1 for Buffer */
3769         iov[0].iov_len = len;
3770         return 0;
3771 }
3772
3773 void
3774 SMB2_query_info_free(struct smb_rqst *rqst)
3775 {
3776         if (rqst && rqst->rq_iov)
3777                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3778 }
3779
3780 static int
3781 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3782            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3783            u32 additional_info, size_t output_len, size_t min_len, void **data,
3784                 u32 *dlen)
3785 {
3786         struct smb_rqst rqst;
3787         struct smb2_query_info_rsp *rsp = NULL;
3788         struct kvec iov[1];
3789         struct kvec rsp_iov;
3790         int rc = 0;
3791         int resp_buftype = CIFS_NO_BUFFER;
3792         struct cifs_ses *ses = tcon->ses;
3793         struct TCP_Server_Info *server;
3794         int flags = 0;
3795         bool allocated = false;
3796         int retries = 0, cur_sleep = 1;
3797
3798         cifs_dbg(FYI, "Query Info\n");
3799
3800         if (!ses)
3801                 return -EIO;
3802
3803 replay_again:
3804         /* reinitialize for possible replay */
3805         flags = 0;
3806         allocated = false;
3807         server = cifs_pick_channel(ses);
3808
3809         if (!server)
3810                 return -EIO;
3811
3812         if (smb3_encryption_required(tcon))
3813                 flags |= CIFS_TRANSFORM_REQ;
3814
3815         memset(&rqst, 0, sizeof(struct smb_rqst));
3816         memset(&iov, 0, sizeof(iov));
3817         rqst.rq_iov = iov;
3818         rqst.rq_nvec = 1;
3819
3820         rc = SMB2_query_info_init(tcon, server,
3821                                   &rqst, persistent_fid, volatile_fid,
3822                                   info_class, info_type, additional_info,
3823                                   output_len, 0, NULL);
3824         if (rc)
3825                 goto qinf_exit;
3826
3827         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3828                                     ses->Suid, info_class, (__u32)info_type);
3829
3830         if (retries)
3831                 smb2_set_replay(server, &rqst);
3832
3833         rc = cifs_send_recv(xid, ses, server,
3834                             &rqst, &resp_buftype, flags, &rsp_iov);
3835         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3836
3837         if (rc) {
3838                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3839                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3840                                 ses->Suid, info_class, (__u32)info_type, rc);
3841                 goto qinf_exit;
3842         }
3843
3844         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3845                                 ses->Suid, info_class, (__u32)info_type);
3846
3847         if (dlen) {
3848                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3849                 if (!*data) {
3850                         *data = kmalloc(*dlen, GFP_KERNEL);
3851                         if (!*data) {
3852                                 cifs_tcon_dbg(VFS,
3853                                         "Error %d allocating memory for acl\n",
3854                                         rc);
3855                                 *dlen = 0;
3856                                 rc = -ENOMEM;
3857                                 goto qinf_exit;
3858                         }
3859                         allocated = true;
3860                 }
3861         }
3862
3863         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3864                                         le32_to_cpu(rsp->OutputBufferLength),
3865                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3866         if (rc && allocated) {
3867                 kfree(*data);
3868                 *data = NULL;
3869                 *dlen = 0;
3870         }
3871
3872 qinf_exit:
3873         SMB2_query_info_free(&rqst);
3874         free_rsp_buf(resp_buftype, rsp);
3875
3876         if (is_replayable_error(rc) &&
3877             smb2_should_replay(tcon, &retries, &cur_sleep))
3878                 goto replay_again;
3879
3880         return rc;
3881 }
3882
3883 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3884         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3885 {
3886         return query_info(xid, tcon, persistent_fid, volatile_fid,
3887                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3888                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3889                           sizeof(struct smb2_file_all_info), (void **)&data,
3890                           NULL);
3891 }
3892
3893 #if 0
3894 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3895 int
3896 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3897                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3898 {
3899         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3900                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3901         *plen = 0;
3902
3903         return query_info(xid, tcon, persistent_fid, volatile_fid,
3904                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3905                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3906         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3907 }
3908 #endif
3909
3910 int
3911 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3912                u64 persistent_fid, u64 volatile_fid,
3913                void **data, u32 *plen, u32 extra_info)
3914 {
3915         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3916                                 extra_info;
3917         *plen = 0;
3918
3919         return query_info(xid, tcon, persistent_fid, volatile_fid,
3920                           0, SMB2_O_INFO_SECURITY, additional_info,
3921                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3922 }
3923
3924 int
3925 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3926                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3927 {
3928         return query_info(xid, tcon, persistent_fid, volatile_fid,
3929                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3930                           sizeof(struct smb2_file_internal_info),
3931                           sizeof(struct smb2_file_internal_info),
3932                           (void **)&uniqueid, NULL);
3933 }
3934
3935 /*
3936  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3937  * See MS-SMB2 2.2.35 and 2.2.36
3938  */
3939
3940 static int
3941 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3942                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3943                  u64 persistent_fid, u64 volatile_fid,
3944                  u32 completion_filter, bool watch_tree)
3945 {
3946         struct smb2_change_notify_req *req;
3947         struct kvec *iov = rqst->rq_iov;
3948         unsigned int total_len;
3949         int rc;
3950
3951         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3952                                  (void **) &req, &total_len);
3953         if (rc)
3954                 return rc;
3955
3956         req->PersistentFileId = persistent_fid;
3957         req->VolatileFileId = volatile_fid;
3958         /* See note 354 of MS-SMB2, 64K max */
3959         req->OutputBufferLength =
3960                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3961         req->CompletionFilter = cpu_to_le32(completion_filter);
3962         if (watch_tree)
3963                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3964         else
3965                 req->Flags = 0;
3966
3967         iov[0].iov_base = (char *)req;
3968         iov[0].iov_len = total_len;
3969
3970         return 0;
3971 }
3972
3973 int
3974 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3975                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3976                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3977                 u32 *plen /* returned data len */)
3978 {
3979         struct cifs_ses *ses = tcon->ses;
3980         struct TCP_Server_Info *server;
3981         struct smb_rqst rqst;
3982         struct smb2_change_notify_rsp *smb_rsp;
3983         struct kvec iov[1];
3984         struct kvec rsp_iov = {NULL, 0};
3985         int resp_buftype = CIFS_NO_BUFFER;
3986         int flags = 0;
3987         int rc = 0;
3988         int retries = 0, cur_sleep = 1;
3989
3990 replay_again:
3991         /* reinitialize for possible replay */
3992         flags = 0;
3993         server = cifs_pick_channel(ses);
3994
3995         cifs_dbg(FYI, "change notify\n");
3996         if (!ses || !server)
3997                 return -EIO;
3998
3999         if (smb3_encryption_required(tcon))
4000                 flags |= CIFS_TRANSFORM_REQ;
4001
4002         memset(&rqst, 0, sizeof(struct smb_rqst));
4003         memset(&iov, 0, sizeof(iov));
4004         if (plen)
4005                 *plen = 0;
4006
4007         rqst.rq_iov = iov;
4008         rqst.rq_nvec = 1;
4009
4010         rc = SMB2_notify_init(xid, &rqst, tcon, server,
4011                               persistent_fid, volatile_fid,
4012                               completion_filter, watch_tree);
4013         if (rc)
4014                 goto cnotify_exit;
4015
4016         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4017                                 (u8)watch_tree, completion_filter);
4018
4019         if (retries)
4020                 smb2_set_replay(server, &rqst);
4021
4022         rc = cifs_send_recv(xid, ses, server,
4023                             &rqst, &resp_buftype, flags, &rsp_iov);
4024
4025         if (rc != 0) {
4026                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4027                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4028                                 (u8)watch_tree, completion_filter, rc);
4029         } else {
4030                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4031                         ses->Suid, (u8)watch_tree, completion_filter);
4032                 /* validate that notify information is plausible */
4033                 if ((rsp_iov.iov_base == NULL) ||
4034                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4035                         goto cnotify_exit;
4036
4037                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4038
4039                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4040                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4041                                 sizeof(struct file_notify_information));
4042
4043                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4044                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4045                 if (*out_data == NULL) {
4046                         rc = -ENOMEM;
4047                         goto cnotify_exit;
4048                 } else if (plen)
4049                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4050         }
4051
4052  cnotify_exit:
4053         if (rqst.rq_iov)
4054                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4055         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4056
4057         if (is_replayable_error(rc) &&
4058             smb2_should_replay(tcon, &retries, &cur_sleep))
4059                 goto replay_again;
4060
4061         return rc;
4062 }
4063
4064
4065
4066 /*
4067  * This is a no-op for now. We're not really interested in the reply, but
4068  * rather in the fact that the server sent one and that server->lstrp
4069  * gets updated.
4070  *
4071  * FIXME: maybe we should consider checking that the reply matches request?
4072  */
4073 static void
4074 smb2_echo_callback(struct mid_q_entry *mid)
4075 {
4076         struct TCP_Server_Info *server = mid->callback_data;
4077         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4078         struct cifs_credits credits = { .value = 0, .instance = 0 };
4079
4080         if (mid->mid_state == MID_RESPONSE_RECEIVED
4081             || mid->mid_state == MID_RESPONSE_MALFORMED) {
4082                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4083                 credits.instance = server->reconnect_instance;
4084         }
4085
4086         release_mid(mid);
4087         add_credits(server, &credits, CIFS_ECHO_OP);
4088 }
4089
4090 void smb2_reconnect_server(struct work_struct *work)
4091 {
4092         struct TCP_Server_Info *server = container_of(work,
4093                                         struct TCP_Server_Info, reconnect.work);
4094         struct TCP_Server_Info *pserver;
4095         struct cifs_ses *ses, *ses2;
4096         struct cifs_tcon *tcon, *tcon2;
4097         struct list_head tmp_list, tmp_ses_list;
4098         bool ses_exist = false;
4099         bool tcon_selected = false;
4100         int rc;
4101         bool resched = false;
4102
4103         /* first check if ref count has reached 0, if not inc ref count */
4104         spin_lock(&cifs_tcp_ses_lock);
4105         if (!server->srv_count) {
4106                 spin_unlock(&cifs_tcp_ses_lock);
4107                 return;
4108         }
4109         server->srv_count++;
4110         spin_unlock(&cifs_tcp_ses_lock);
4111
4112         /* If server is a channel, select the primary channel */
4113         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4114
4115         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4116         mutex_lock(&pserver->reconnect_mutex);
4117
4118         /* if the server is marked for termination, drop the ref count here */
4119         if (server->terminate) {
4120                 cifs_put_tcp_session(server, true);
4121                 mutex_unlock(&pserver->reconnect_mutex);
4122                 return;
4123         }
4124
4125         INIT_LIST_HEAD(&tmp_list);
4126         INIT_LIST_HEAD(&tmp_ses_list);
4127         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4128
4129         spin_lock(&cifs_tcp_ses_lock);
4130         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4131                 spin_lock(&ses->ses_lock);
4132                 if (ses->ses_status == SES_EXITING) {
4133                         spin_unlock(&ses->ses_lock);
4134                         continue;
4135                 }
4136                 spin_unlock(&ses->ses_lock);
4137
4138                 tcon_selected = false;
4139
4140                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4141                         if (tcon->need_reconnect || tcon->need_reopen_files) {
4142                                 tcon->tc_count++;
4143                                 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4144                                                     netfs_trace_tcon_ref_get_reconnect_server);
4145                                 list_add_tail(&tcon->rlist, &tmp_list);
4146                                 tcon_selected = true;
4147                         }
4148                 }
4149                 /*
4150                  * IPC has the same lifetime as its session and uses its
4151                  * refcount.
4152                  */
4153                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4154                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4155                         tcon_selected = true;
4156                         cifs_smb_ses_inc_refcount(ses);
4157                 }
4158                 /*
4159                  * handle the case where channel needs to reconnect
4160                  * binding session, but tcon is healthy (some other channel
4161                  * is active)
4162                  */
4163                 spin_lock(&ses->chan_lock);
4164                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4165                         list_add_tail(&ses->rlist, &tmp_ses_list);
4166                         ses_exist = true;
4167                         cifs_smb_ses_inc_refcount(ses);
4168                 }
4169                 spin_unlock(&ses->chan_lock);
4170         }
4171         spin_unlock(&cifs_tcp_ses_lock);
4172
4173         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4174                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4175                 if (!rc)
4176                         cifs_reopen_persistent_handles(tcon);
4177                 else
4178                         resched = true;
4179                 list_del_init(&tcon->rlist);
4180                 if (tcon->ipc)
4181                         cifs_put_smb_ses(tcon->ses);
4182                 else
4183                         cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4184         }
4185
4186         if (!ses_exist)
4187                 goto done;
4188
4189         /* allocate a dummy tcon struct used for reconnect */
4190         tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4191         if (!tcon) {
4192                 resched = true;
4193                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4194                         list_del_init(&ses->rlist);
4195                         cifs_put_smb_ses(ses);
4196                 }
4197                 goto done;
4198         }
4199
4200         tcon->status = TID_GOOD;
4201         tcon->retry = false;
4202         tcon->need_reconnect = false;
4203
4204         /* now reconnect sessions for necessary channels */
4205         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4206                 tcon->ses = ses;
4207                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4208                 if (rc)
4209                         resched = true;
4210                 list_del_init(&ses->rlist);
4211                 cifs_put_smb_ses(ses);
4212         }
4213         tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4214
4215 done:
4216         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4217         if (resched)
4218                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4219         mutex_unlock(&pserver->reconnect_mutex);
4220
4221         /* now we can safely release srv struct */
4222         cifs_put_tcp_session(server, true);
4223 }
4224
4225 int
4226 SMB2_echo(struct TCP_Server_Info *server)
4227 {
4228         struct smb2_echo_req *req;
4229         int rc = 0;
4230         struct kvec iov[1];
4231         struct smb_rqst rqst = { .rq_iov = iov,
4232                                  .rq_nvec = 1 };
4233         unsigned int total_len;
4234
4235         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4236
4237         spin_lock(&server->srv_lock);
4238         if (server->ops->need_neg &&
4239             server->ops->need_neg(server)) {
4240                 spin_unlock(&server->srv_lock);
4241                 /* No need to send echo on newly established connections */
4242                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4243                 return rc;
4244         }
4245         spin_unlock(&server->srv_lock);
4246
4247         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4248                                  (void **)&req, &total_len);
4249         if (rc)
4250                 return rc;
4251
4252         req->hdr.CreditRequest = cpu_to_le16(1);
4253
4254         iov[0].iov_len = total_len;
4255         iov[0].iov_base = (char *)req;
4256
4257         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4258                              server, CIFS_ECHO_OP, NULL);
4259         if (rc)
4260                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4261
4262         cifs_small_buf_release(req);
4263         return rc;
4264 }
4265
4266 void
4267 SMB2_flush_free(struct smb_rqst *rqst)
4268 {
4269         if (rqst && rqst->rq_iov)
4270                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4271 }
4272
4273 int
4274 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4275                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4276                 u64 persistent_fid, u64 volatile_fid)
4277 {
4278         struct smb2_flush_req *req;
4279         struct kvec *iov = rqst->rq_iov;
4280         unsigned int total_len;
4281         int rc;
4282
4283         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4284                                  (void **) &req, &total_len);
4285         if (rc)
4286                 return rc;
4287
4288         req->PersistentFileId = persistent_fid;
4289         req->VolatileFileId = volatile_fid;
4290
4291         iov[0].iov_base = (char *)req;
4292         iov[0].iov_len = total_len;
4293
4294         return 0;
4295 }
4296
4297 int
4298 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4299            u64 volatile_fid)
4300 {
4301         struct cifs_ses *ses = tcon->ses;
4302         struct smb_rqst rqst;
4303         struct kvec iov[1];
4304         struct kvec rsp_iov = {NULL, 0};
4305         struct TCP_Server_Info *server;
4306         int resp_buftype = CIFS_NO_BUFFER;
4307         int flags = 0;
4308         int rc = 0;
4309         int retries = 0, cur_sleep = 1;
4310
4311 replay_again:
4312         /* reinitialize for possible replay */
4313         flags = 0;
4314         server = cifs_pick_channel(ses);
4315
4316         cifs_dbg(FYI, "flush\n");
4317         if (!ses || !(ses->server))
4318                 return -EIO;
4319
4320         if (smb3_encryption_required(tcon))
4321                 flags |= CIFS_TRANSFORM_REQ;
4322
4323         memset(&rqst, 0, sizeof(struct smb_rqst));
4324         memset(&iov, 0, sizeof(iov));
4325         rqst.rq_iov = iov;
4326         rqst.rq_nvec = 1;
4327
4328         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4329                              persistent_fid, volatile_fid);
4330         if (rc)
4331                 goto flush_exit;
4332
4333         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4334
4335         if (retries)
4336                 smb2_set_replay(server, &rqst);
4337
4338         rc = cifs_send_recv(xid, ses, server,
4339                             &rqst, &resp_buftype, flags, &rsp_iov);
4340
4341         if (rc != 0) {
4342                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4343                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4344                                      rc);
4345         } else
4346                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4347                                       ses->Suid);
4348
4349  flush_exit:
4350         SMB2_flush_free(&rqst);
4351         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4352
4353         if (is_replayable_error(rc) &&
4354             smb2_should_replay(tcon, &retries, &cur_sleep))
4355                 goto replay_again;
4356
4357         return rc;
4358 }
4359
4360 #ifdef CONFIG_CIFS_SMB_DIRECT
4361 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4362 {
4363         struct TCP_Server_Info *server = io_parms->server;
4364         struct cifs_tcon *tcon = io_parms->tcon;
4365
4366         /* we can only offload if we're connected */
4367         if (!server || !tcon)
4368                 return false;
4369
4370         /* we can only offload on an rdma connection */
4371         if (!server->rdma || !server->smbd_conn)
4372                 return false;
4373
4374         /* we don't support signed offload yet */
4375         if (server->sign)
4376                 return false;
4377
4378         /* we don't support encrypted offload yet */
4379         if (smb3_encryption_required(tcon))
4380                 return false;
4381
4382         /* offload also has its overhead, so only do it if desired */
4383         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4384                 return false;
4385
4386         return true;
4387 }
4388 #endif /* CONFIG_CIFS_SMB_DIRECT */
4389
4390 /*
4391  * To form a chain of read requests, any read requests after the first should
4392  * have the end_of_chain boolean set to true.
4393  */
4394 static int
4395 smb2_new_read_req(void **buf, unsigned int *total_len,
4396         struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4397         unsigned int remaining_bytes, int request_type)
4398 {
4399         int rc = -EACCES;
4400         struct smb2_read_req *req = NULL;
4401         struct smb2_hdr *shdr;
4402         struct TCP_Server_Info *server = io_parms->server;
4403
4404         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4405                                  (void **) &req, total_len);
4406         if (rc)
4407                 return rc;
4408
4409         if (server == NULL)
4410                 return -ECONNABORTED;
4411
4412         shdr = &req->hdr;
4413         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4414
4415         req->PersistentFileId = io_parms->persistent_fid;
4416         req->VolatileFileId = io_parms->volatile_fid;
4417         req->ReadChannelInfoOffset = 0; /* reserved */
4418         req->ReadChannelInfoLength = 0; /* reserved */
4419         req->Channel = 0; /* reserved */
4420         req->MinimumCount = 0;
4421         req->Length = cpu_to_le32(io_parms->length);
4422         req->Offset = cpu_to_le64(io_parms->offset);
4423
4424         trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4425                               rdata ? rdata->subreq.debug_index : 0,
4426                               rdata ? rdata->xid : 0,
4427                               io_parms->persistent_fid,
4428                               io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4429                               io_parms->offset, io_parms->length);
4430 #ifdef CONFIG_CIFS_SMB_DIRECT
4431         /*
4432          * If we want to do a RDMA write, fill in and append
4433          * smbd_buffer_descriptor_v1 to the end of read request
4434          */
4435         if (smb3_use_rdma_offload(io_parms)) {
4436                 struct smbd_buffer_descriptor_v1 *v1;
4437                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4438
4439                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4440                                              true, need_invalidate);
4441                 if (!rdata->mr)
4442                         return -EAGAIN;
4443
4444                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4445                 if (need_invalidate)
4446                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4447                 req->ReadChannelInfoOffset =
4448                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4449                 req->ReadChannelInfoLength =
4450                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4451                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4452                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4453                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4454                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4455
4456                 *total_len += sizeof(*v1) - 1;
4457         }
4458 #endif
4459         if (request_type & CHAINED_REQUEST) {
4460                 if (!(request_type & END_OF_CHAIN)) {
4461                         /* next 8-byte aligned request */
4462                         *total_len = ALIGN(*total_len, 8);
4463                         shdr->NextCommand = cpu_to_le32(*total_len);
4464                 } else /* END_OF_CHAIN */
4465                         shdr->NextCommand = 0;
4466                 if (request_type & RELATED_REQUEST) {
4467                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4468                         /*
4469                          * Related requests use info from previous read request
4470                          * in chain.
4471                          */
4472                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4473                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4474                         req->PersistentFileId = (u64)-1;
4475                         req->VolatileFileId = (u64)-1;
4476                 }
4477         }
4478         if (remaining_bytes > io_parms->length)
4479                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4480         else
4481                 req->RemainingBytes = 0;
4482
4483         *buf = req;
4484         return rc;
4485 }
4486
4487 static void smb2_readv_worker(struct work_struct *work)
4488 {
4489         struct cifs_io_subrequest *rdata =
4490                 container_of(work, struct cifs_io_subrequest, subreq.work);
4491
4492         netfs_subreq_terminated(&rdata->subreq,
4493                                 (rdata->result == 0 || rdata->result == -EAGAIN) ?
4494                                 rdata->got_bytes : rdata->result, true);
4495 }
4496
4497 static void
4498 smb2_readv_callback(struct mid_q_entry *mid)
4499 {
4500         struct cifs_io_subrequest *rdata = mid->callback_data;
4501         struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4502         struct TCP_Server_Info *server = rdata->server;
4503         struct smb2_hdr *shdr =
4504                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4505         struct cifs_credits credits = {
4506                 .value = 0,
4507                 .instance = 0,
4508                 .rreq_debug_id = rdata->rreq->debug_id,
4509                 .rreq_debug_index = rdata->subreq.debug_index,
4510         };
4511         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4512         unsigned int rreq_debug_id = rdata->rreq->debug_id;
4513         unsigned int subreq_debug_index = rdata->subreq.debug_index;
4514
4515         if (rdata->got_bytes) {
4516                 rqst.rq_iter      = rdata->subreq.io_iter;
4517                 rqst.rq_iter_size = iov_iter_count(&rdata->subreq.io_iter);
4518         }
4519
4520         WARN_ONCE(rdata->server != mid->server,
4521                   "rdata server %p != mid server %p",
4522                   rdata->server, mid->server);
4523
4524         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu\n",
4525                  __func__, mid->mid, mid->mid_state, rdata->result,
4526                  rdata->subreq.len);
4527
4528         switch (mid->mid_state) {
4529         case MID_RESPONSE_RECEIVED:
4530                 credits.value = le16_to_cpu(shdr->CreditRequest);
4531                 credits.instance = server->reconnect_instance;
4532                 /* result already set, check signature */
4533                 if (server->sign && !mid->decrypted) {
4534                         int rc;
4535
4536                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4537                         rc = smb2_verify_signature(&rqst, server);
4538                         if (rc)
4539                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4540                                          rc);
4541                 }
4542                 /* FIXME: should this be counted toward the initiating task? */
4543                 task_io_account_read(rdata->got_bytes);
4544                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4545                 break;
4546         case MID_REQUEST_SUBMITTED:
4547         case MID_RETRY_NEEDED:
4548                 rdata->result = -EAGAIN;
4549                 if (server->sign && rdata->got_bytes)
4550                         /* reset bytes number since we can not check a sign */
4551                         rdata->got_bytes = 0;
4552                 /* FIXME: should this be counted toward the initiating task? */
4553                 task_io_account_read(rdata->got_bytes);
4554                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4555                 break;
4556         case MID_RESPONSE_MALFORMED:
4557                 credits.value = le16_to_cpu(shdr->CreditRequest);
4558                 credits.instance = server->reconnect_instance;
4559                 fallthrough;
4560         default:
4561                 rdata->result = -EIO;
4562         }
4563 #ifdef CONFIG_CIFS_SMB_DIRECT
4564         /*
4565          * If this rdata has a memmory registered, the MR can be freed
4566          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4567          * because they have limited number and are used for future I/Os
4568          */
4569         if (rdata->mr) {
4570                 smbd_deregister_mr(rdata->mr);
4571                 rdata->mr = NULL;
4572         }
4573 #endif
4574         if (rdata->result && rdata->result != -ENODATA) {
4575                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4576                 trace_smb3_read_err(rdata->rreq->debug_id,
4577                                     rdata->subreq.debug_index,
4578                                     rdata->xid,
4579                                     rdata->req->cfile->fid.persistent_fid,
4580                                     tcon->tid, tcon->ses->Suid, rdata->subreq.start,
4581                                     rdata->subreq.len, rdata->result);
4582         } else
4583                 trace_smb3_read_done(rdata->rreq->debug_id,
4584                                      rdata->subreq.debug_index,
4585                                      rdata->xid,
4586                                      rdata->req->cfile->fid.persistent_fid,
4587                                      tcon->tid, tcon->ses->Suid,
4588                                      rdata->subreq.start, rdata->got_bytes);
4589
4590         if (rdata->result == -ENODATA) {
4591                 /* We may have got an EOF error because fallocate
4592                  * failed to enlarge the file.
4593                  */
4594                 if (rdata->subreq.start < rdata->subreq.rreq->i_size)
4595                         rdata->result = 0;
4596         }
4597         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4598                               server->credits, server->in_flight,
4599                               0, cifs_trace_rw_credits_read_response_clear);
4600         rdata->credits.value = 0;
4601         INIT_WORK(&rdata->subreq.work, smb2_readv_worker);
4602         queue_work(cifsiod_wq, &rdata->subreq.work);
4603         release_mid(mid);
4604         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4605                               server->credits, server->in_flight,
4606                               credits.value, cifs_trace_rw_credits_read_response_add);
4607         add_credits(server, &credits, 0);
4608 }
4609
4610 /* smb2_async_readv - send an async read, and set up mid to handle result */
4611 int
4612 smb2_async_readv(struct cifs_io_subrequest *rdata)
4613 {
4614         int rc, flags = 0;
4615         char *buf;
4616         struct smb2_hdr *shdr;
4617         struct cifs_io_parms io_parms;
4618         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4619                                  .rq_nvec = 1 };
4620         struct TCP_Server_Info *server;
4621         struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4622         unsigned int total_len;
4623         int credit_request;
4624
4625         cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4626                  __func__, rdata->subreq.start, rdata->subreq.len);
4627
4628         if (!rdata->server)
4629                 rdata->server = cifs_pick_channel(tcon->ses);
4630
4631         io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4632         io_parms.server = server = rdata->server;
4633         io_parms.offset = rdata->subreq.start;
4634         io_parms.length = rdata->subreq.len;
4635         io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4636         io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4637         io_parms.pid = rdata->req->pid;
4638
4639         rc = smb2_new_read_req(
4640                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4641         if (rc)
4642                 return rc;
4643
4644         if (smb3_encryption_required(io_parms.tcon))
4645                 flags |= CIFS_TRANSFORM_REQ;
4646
4647         rdata->iov[0].iov_base = buf;
4648         rdata->iov[0].iov_len = total_len;
4649
4650         shdr = (struct smb2_hdr *)buf;
4651
4652         if (rdata->credits.value > 0) {
4653                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->subreq.len,
4654                                                 SMB2_MAX_BUFFER_SIZE));
4655                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4656                 if (server->credits >= server->max_credits)
4657                         shdr->CreditRequest = cpu_to_le16(0);
4658                 else
4659                         shdr->CreditRequest = cpu_to_le16(
4660                                 min_t(int, server->max_credits -
4661                                                 server->credits, credit_request));
4662
4663                 rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4664                 if (rc)
4665                         goto async_readv_out;
4666
4667                 flags |= CIFS_HAS_CREDITS;
4668         }
4669
4670         rc = cifs_call_async(server, &rqst,
4671                              cifs_readv_receive, smb2_readv_callback,
4672                              smb3_handle_read_data, rdata, flags,
4673                              &rdata->credits);
4674         if (rc) {
4675                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4676                 trace_smb3_read_err(rdata->rreq->debug_id,
4677                                     rdata->subreq.debug_index,
4678                                     rdata->xid, io_parms.persistent_fid,
4679                                     io_parms.tcon->tid,
4680                                     io_parms.tcon->ses->Suid,
4681                                     io_parms.offset, io_parms.length, rc);
4682         }
4683
4684 async_readv_out:
4685         cifs_small_buf_release(buf);
4686         return rc;
4687 }
4688
4689 int
4690 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4691           unsigned int *nbytes, char **buf, int *buf_type)
4692 {
4693         struct smb_rqst rqst;
4694         int resp_buftype, rc;
4695         struct smb2_read_req *req = NULL;
4696         struct smb2_read_rsp *rsp = NULL;
4697         struct kvec iov[1];
4698         struct kvec rsp_iov;
4699         unsigned int total_len;
4700         int flags = CIFS_LOG_ERROR;
4701         struct cifs_ses *ses = io_parms->tcon->ses;
4702
4703         if (!io_parms->server)
4704                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4705
4706         *nbytes = 0;
4707         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4708         if (rc)
4709                 return rc;
4710
4711         if (smb3_encryption_required(io_parms->tcon))
4712                 flags |= CIFS_TRANSFORM_REQ;
4713
4714         iov[0].iov_base = (char *)req;
4715         iov[0].iov_len = total_len;
4716
4717         memset(&rqst, 0, sizeof(struct smb_rqst));
4718         rqst.rq_iov = iov;
4719         rqst.rq_nvec = 1;
4720
4721         rc = cifs_send_recv(xid, ses, io_parms->server,
4722                             &rqst, &resp_buftype, flags, &rsp_iov);
4723         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4724
4725         if (rc) {
4726                 if (rc != -ENODATA) {
4727                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4728                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4729                         trace_smb3_read_err(0, 0, xid,
4730                                             req->PersistentFileId,
4731                                             io_parms->tcon->tid, ses->Suid,
4732                                             io_parms->offset, io_parms->length,
4733                                             rc);
4734                 } else
4735                         trace_smb3_read_done(0, 0, xid,
4736                                              req->PersistentFileId, io_parms->tcon->tid,
4737                                              ses->Suid, io_parms->offset, 0);
4738                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4739                 cifs_small_buf_release(req);
4740                 return rc == -ENODATA ? 0 : rc;
4741         } else
4742                 trace_smb3_read_done(0, 0, xid,
4743                                      req->PersistentFileId,
4744                                      io_parms->tcon->tid, ses->Suid,
4745                                      io_parms->offset, io_parms->length);
4746
4747         cifs_small_buf_release(req);
4748
4749         *nbytes = le32_to_cpu(rsp->DataLength);
4750         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4751             (*nbytes > io_parms->length)) {
4752                 cifs_dbg(FYI, "bad length %d for count %d\n",
4753                          *nbytes, io_parms->length);
4754                 rc = -EIO;
4755                 *nbytes = 0;
4756         }
4757
4758         if (*buf) {
4759                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4760                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4761         } else if (resp_buftype != CIFS_NO_BUFFER) {
4762                 *buf = rsp_iov.iov_base;
4763                 if (resp_buftype == CIFS_SMALL_BUFFER)
4764                         *buf_type = CIFS_SMALL_BUFFER;
4765                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4766                         *buf_type = CIFS_LARGE_BUFFER;
4767         }
4768         return rc;
4769 }
4770
4771 /*
4772  * Check the mid_state and signature on received buffer (if any), and queue the
4773  * workqueue completion task.
4774  */
4775 static void
4776 smb2_writev_callback(struct mid_q_entry *mid)
4777 {
4778         struct cifs_io_subrequest *wdata = mid->callback_data;
4779         struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4780         struct TCP_Server_Info *server = wdata->server;
4781         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4782         struct cifs_credits credits = {
4783                 .value = 0,
4784                 .instance = 0,
4785                 .rreq_debug_id = wdata->rreq->debug_id,
4786                 .rreq_debug_index = wdata->subreq.debug_index,
4787         };
4788         unsigned int rreq_debug_id = wdata->rreq->debug_id;
4789         unsigned int subreq_debug_index = wdata->subreq.debug_index;
4790         ssize_t result = 0;
4791         size_t written;
4792
4793         WARN_ONCE(wdata->server != mid->server,
4794                   "wdata server %p != mid server %p",
4795                   wdata->server, mid->server);
4796
4797         switch (mid->mid_state) {
4798         case MID_RESPONSE_RECEIVED:
4799                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4800                 credits.instance = server->reconnect_instance;
4801                 result = smb2_check_receive(mid, server, 0);
4802                 if (result != 0)
4803                         break;
4804
4805                 written = le32_to_cpu(rsp->DataLength);
4806                 /*
4807                  * Mask off high 16 bits when bytes written as returned
4808                  * by the server is greater than bytes requested by the
4809                  * client. OS/2 servers are known to set incorrect
4810                  * CountHigh values.
4811                  */
4812                 if (written > wdata->subreq.len)
4813                         written &= 0xFFFF;
4814
4815                 if (written < wdata->subreq.len)
4816                         wdata->result = -ENOSPC;
4817                 else
4818                         wdata->subreq.len = written;
4819                 break;
4820         case MID_REQUEST_SUBMITTED:
4821         case MID_RETRY_NEEDED:
4822                 result = -EAGAIN;
4823                 break;
4824         case MID_RESPONSE_MALFORMED:
4825                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4826                 credits.instance = server->reconnect_instance;
4827                 fallthrough;
4828         default:
4829                 result = -EIO;
4830                 break;
4831         }
4832 #ifdef CONFIG_CIFS_SMB_DIRECT
4833         /*
4834          * If this wdata has a memory registered, the MR can be freed
4835          * The number of MRs available is limited, it's important to recover
4836          * used MR as soon as I/O is finished. Hold MR longer in the later
4837          * I/O process can possibly result in I/O deadlock due to lack of MR
4838          * to send request on I/O retry
4839          */
4840         if (wdata->mr) {
4841                 smbd_deregister_mr(wdata->mr);
4842                 wdata->mr = NULL;
4843         }
4844 #endif
4845         if (result) {
4846                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4847                 trace_smb3_write_err(wdata->xid,
4848                                      wdata->req->cfile->fid.persistent_fid,
4849                                      tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4850                                      wdata->subreq.len, wdata->result);
4851                 if (wdata->result == -ENOSPC)
4852                         pr_warn_once("Out of space writing to %s\n",
4853                                      tcon->tree_name);
4854         } else
4855                 trace_smb3_write_done(0 /* no xid */,
4856                                       wdata->req->cfile->fid.persistent_fid,
4857                                       tcon->tid, tcon->ses->Suid,
4858                                       wdata->subreq.start, wdata->subreq.len);
4859
4860         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4861                               server->credits, server->in_flight,
4862                               0, cifs_trace_rw_credits_write_response_clear);
4863         wdata->credits.value = 0;
4864         cifs_write_subrequest_terminated(wdata, result ?: written, true);
4865         release_mid(mid);
4866         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4867                               server->credits, server->in_flight,
4868                               credits.value, cifs_trace_rw_credits_write_response_add);
4869         add_credits(server, &credits, 0);
4870 }
4871
4872 /* smb2_async_writev - send an async write, and set up mid to handle result */
4873 void
4874 smb2_async_writev(struct cifs_io_subrequest *wdata)
4875 {
4876         int rc = -EACCES, flags = 0;
4877         struct smb2_write_req *req = NULL;
4878         struct smb2_hdr *shdr;
4879         struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4880         struct TCP_Server_Info *server = wdata->server;
4881         struct kvec iov[1];
4882         struct smb_rqst rqst = { };
4883         unsigned int total_len, xid = wdata->xid;
4884         struct cifs_io_parms _io_parms;
4885         struct cifs_io_parms *io_parms = NULL;
4886         int credit_request;
4887
4888         /*
4889          * in future we may get cifs_io_parms passed in from the caller,
4890          * but for now we construct it here...
4891          */
4892         _io_parms = (struct cifs_io_parms) {
4893                 .tcon = tcon,
4894                 .server = server,
4895                 .offset = wdata->subreq.start,
4896                 .length = wdata->subreq.len,
4897                 .persistent_fid = wdata->req->cfile->fid.persistent_fid,
4898                 .volatile_fid = wdata->req->cfile->fid.volatile_fid,
4899                 .pid = wdata->req->pid,
4900         };
4901         io_parms = &_io_parms;
4902
4903         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4904                                  (void **) &req, &total_len);
4905         if (rc)
4906                 goto out;
4907
4908         if (smb3_encryption_required(tcon))
4909                 flags |= CIFS_TRANSFORM_REQ;
4910
4911         shdr = (struct smb2_hdr *)req;
4912         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4913
4914         req->PersistentFileId = io_parms->persistent_fid;
4915         req->VolatileFileId = io_parms->volatile_fid;
4916         req->WriteChannelInfoOffset = 0;
4917         req->WriteChannelInfoLength = 0;
4918         req->Channel = SMB2_CHANNEL_NONE;
4919         req->Offset = cpu_to_le64(io_parms->offset);
4920         req->DataOffset = cpu_to_le16(
4921                                 offsetof(struct smb2_write_req, Buffer));
4922         req->RemainingBytes = 0;
4923
4924         trace_smb3_write_enter(wdata->xid,
4925                                io_parms->persistent_fid,
4926                                io_parms->tcon->tid,
4927                                io_parms->tcon->ses->Suid,
4928                                io_parms->offset,
4929                                io_parms->length);
4930
4931 #ifdef CONFIG_CIFS_SMB_DIRECT
4932         /*
4933          * If we want to do a server RDMA read, fill in and append
4934          * smbd_buffer_descriptor_v1 to the end of write request
4935          */
4936         if (smb3_use_rdma_offload(io_parms)) {
4937                 struct smbd_buffer_descriptor_v1 *v1;
4938                 size_t data_size = iov_iter_count(&wdata->subreq.io_iter);
4939                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4940
4941                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
4942                                              false, need_invalidate);
4943                 if (!wdata->mr) {
4944                         rc = -EAGAIN;
4945                         goto async_writev_out;
4946                 }
4947                 req->Length = 0;
4948                 req->DataOffset = 0;
4949                 req->RemainingBytes = cpu_to_le32(data_size);
4950                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4951                 if (need_invalidate)
4952                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4953                 req->WriteChannelInfoOffset =
4954                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4955                 req->WriteChannelInfoLength =
4956                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4957                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4958                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4959                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4960                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4961         }
4962 #endif
4963         iov[0].iov_len = total_len - 1;
4964         iov[0].iov_base = (char *)req;
4965
4966         rqst.rq_iov = iov;
4967         rqst.rq_nvec = 1;
4968         rqst.rq_iter = wdata->subreq.io_iter;
4969         rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
4970         if (test_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags))
4971                 smb2_set_replay(server, &rqst);
4972 #ifdef CONFIG_CIFS_SMB_DIRECT
4973         if (wdata->mr)
4974                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4975 #endif
4976         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
4977                  io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
4978
4979 #ifdef CONFIG_CIFS_SMB_DIRECT
4980         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4981         if (!wdata->mr)
4982                 req->Length = cpu_to_le32(io_parms->length);
4983 #else
4984         req->Length = cpu_to_le32(io_parms->length);
4985 #endif
4986
4987         if (wdata->credits.value > 0) {
4988                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
4989                                                     SMB2_MAX_BUFFER_SIZE));
4990                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4991                 if (server->credits >= server->max_credits)
4992                         shdr->CreditRequest = cpu_to_le16(0);
4993                 else
4994                         shdr->CreditRequest = cpu_to_le16(
4995                                 min_t(int, server->max_credits -
4996                                                 server->credits, credit_request));
4997
4998                 rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
4999                 if (rc)
5000                         goto async_writev_out;
5001
5002                 flags |= CIFS_HAS_CREDITS;
5003         }
5004
5005         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5006                              wdata, flags, &wdata->credits);
5007         /* Can't touch wdata if rc == 0 */
5008         if (rc) {
5009                 trace_smb3_write_err(xid,
5010                                      io_parms->persistent_fid,
5011                                      io_parms->tcon->tid,
5012                                      io_parms->tcon->ses->Suid,
5013                                      io_parms->offset,
5014                                      io_parms->length,
5015                                      rc);
5016                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5017         }
5018
5019 async_writev_out:
5020         cifs_small_buf_release(req);
5021 out:
5022         if (rc) {
5023                 trace_smb3_rw_credits(wdata->rreq->debug_id,
5024                                       wdata->subreq.debug_index,
5025                                       wdata->credits.value,
5026                                       server->credits, server->in_flight,
5027                                       -(int)wdata->credits.value,
5028                                       cifs_trace_rw_credits_write_response_clear);
5029                 add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5030                 cifs_write_subrequest_terminated(wdata, rc, true);
5031         }
5032 }
5033
5034 /*
5035  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5036  * The length field from io_parms must be at least 1 and indicates a number of
5037  * elements with data to write that begins with position 1 in iov array. All
5038  * data length is specified by count.
5039  */
5040 int
5041 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5042            unsigned int *nbytes, struct kvec *iov, int n_vec)
5043 {
5044         struct smb_rqst rqst;
5045         int rc = 0;
5046         struct smb2_write_req *req = NULL;
5047         struct smb2_write_rsp *rsp = NULL;
5048         int resp_buftype;
5049         struct kvec rsp_iov;
5050         int flags = 0;
5051         unsigned int total_len;
5052         struct TCP_Server_Info *server;
5053         int retries = 0, cur_sleep = 1;
5054
5055 replay_again:
5056         /* reinitialize for possible replay */
5057         flags = 0;
5058         *nbytes = 0;
5059         if (!io_parms->server)
5060                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5061         server = io_parms->server;
5062         if (server == NULL)
5063                 return -ECONNABORTED;
5064
5065         if (n_vec < 1)
5066                 return rc;
5067
5068         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5069                                  (void **) &req, &total_len);
5070         if (rc)
5071                 return rc;
5072
5073         if (smb3_encryption_required(io_parms->tcon))
5074                 flags |= CIFS_TRANSFORM_REQ;
5075
5076         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5077
5078         req->PersistentFileId = io_parms->persistent_fid;
5079         req->VolatileFileId = io_parms->volatile_fid;
5080         req->WriteChannelInfoOffset = 0;
5081         req->WriteChannelInfoLength = 0;
5082         req->Channel = 0;
5083         req->Length = cpu_to_le32(io_parms->length);
5084         req->Offset = cpu_to_le64(io_parms->offset);
5085         req->DataOffset = cpu_to_le16(
5086                                 offsetof(struct smb2_write_req, Buffer));
5087         req->RemainingBytes = 0;
5088
5089         trace_smb3_write_enter(xid, io_parms->persistent_fid,
5090                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5091                 io_parms->offset, io_parms->length);
5092
5093         iov[0].iov_base = (char *)req;
5094         /* 1 for Buffer */
5095         iov[0].iov_len = total_len - 1;
5096
5097         memset(&rqst, 0, sizeof(struct smb_rqst));
5098         rqst.rq_iov = iov;
5099         rqst.rq_nvec = n_vec + 1;
5100
5101         if (retries)
5102                 smb2_set_replay(server, &rqst);
5103
5104         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5105                             &rqst,
5106                             &resp_buftype, flags, &rsp_iov);
5107         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5108
5109         if (rc) {
5110                 trace_smb3_write_err(xid,
5111                                      req->PersistentFileId,
5112                                      io_parms->tcon->tid,
5113                                      io_parms->tcon->ses->Suid,
5114                                      io_parms->offset, io_parms->length, rc);
5115                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5116                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
5117         } else {
5118                 *nbytes = le32_to_cpu(rsp->DataLength);
5119                 trace_smb3_write_done(xid,
5120                                       req->PersistentFileId,
5121                                       io_parms->tcon->tid,
5122                                       io_parms->tcon->ses->Suid,
5123                                       io_parms->offset, *nbytes);
5124         }
5125
5126         cifs_small_buf_release(req);
5127         free_rsp_buf(resp_buftype, rsp);
5128
5129         if (is_replayable_error(rc) &&
5130             smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5131                 goto replay_again;
5132
5133         return rc;
5134 }
5135
5136 int posix_info_sid_size(const void *beg, const void *end)
5137 {
5138         size_t subauth;
5139         int total;
5140
5141         if (beg + 1 > end)
5142                 return -1;
5143
5144         subauth = *(u8 *)(beg+1);
5145         if (subauth < 1 || subauth > 15)
5146                 return -1;
5147
5148         total = 1 + 1 + 6 + 4*subauth;
5149         if (beg + total > end)
5150                 return -1;
5151
5152         return total;
5153 }
5154
5155 int posix_info_parse(const void *beg, const void *end,
5156                      struct smb2_posix_info_parsed *out)
5157
5158 {
5159         int total_len = 0;
5160         int owner_len, group_len;
5161         int name_len;
5162         const void *owner_sid;
5163         const void *group_sid;
5164         const void *name;
5165
5166         /* if no end bound given, assume payload to be correct */
5167         if (!end) {
5168                 const struct smb2_posix_info *p = beg;
5169
5170                 end = beg + le32_to_cpu(p->NextEntryOffset);
5171                 /* last element will have a 0 offset, pick a sensible bound */
5172                 if (end == beg)
5173                         end += 0xFFFF;
5174         }
5175
5176         /* check base buf */
5177         if (beg + sizeof(struct smb2_posix_info) > end)
5178                 return -1;
5179         total_len = sizeof(struct smb2_posix_info);
5180
5181         /* check owner sid */
5182         owner_sid = beg + total_len;
5183         owner_len = posix_info_sid_size(owner_sid, end);
5184         if (owner_len < 0)
5185                 return -1;
5186         total_len += owner_len;
5187
5188         /* check group sid */
5189         group_sid = beg + total_len;
5190         group_len = posix_info_sid_size(group_sid, end);
5191         if (group_len < 0)
5192                 return -1;
5193         total_len += group_len;
5194
5195         /* check name len */
5196         if (beg + total_len + 4 > end)
5197                 return -1;
5198         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5199         if (name_len < 1 || name_len > 0xFFFF)
5200                 return -1;
5201         total_len += 4;
5202
5203         /* check name */
5204         name = beg + total_len;
5205         if (name + name_len > end)
5206                 return -1;
5207         total_len += name_len;
5208
5209         if (out) {
5210                 out->base = beg;
5211                 out->size = total_len;
5212                 out->name_len = name_len;
5213                 out->name = name;
5214                 memcpy(&out->owner, owner_sid, owner_len);
5215                 memcpy(&out->group, group_sid, group_len);
5216         }
5217         return total_len;
5218 }
5219
5220 static int posix_info_extra_size(const void *beg, const void *end)
5221 {
5222         int len = posix_info_parse(beg, end, NULL);
5223
5224         if (len < 0)
5225                 return -1;
5226         return len - sizeof(struct smb2_posix_info);
5227 }
5228
5229 static unsigned int
5230 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5231             size_t size)
5232 {
5233         int len;
5234         unsigned int entrycount = 0;
5235         unsigned int next_offset = 0;
5236         char *entryptr;
5237         FILE_DIRECTORY_INFO *dir_info;
5238
5239         if (bufstart == NULL)
5240                 return 0;
5241
5242         entryptr = bufstart;
5243
5244         while (1) {
5245                 if (entryptr + next_offset < entryptr ||
5246                     entryptr + next_offset > end_of_buf ||
5247                     entryptr + next_offset + size > end_of_buf) {
5248                         cifs_dbg(VFS, "malformed search entry would overflow\n");
5249                         break;
5250                 }
5251
5252                 entryptr = entryptr + next_offset;
5253                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5254
5255                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
5256                         len = posix_info_extra_size(entryptr, end_of_buf);
5257                 else
5258                         len = le32_to_cpu(dir_info->FileNameLength);
5259
5260                 if (len < 0 ||
5261                     entryptr + len < entryptr ||
5262                     entryptr + len > end_of_buf ||
5263                     entryptr + len + size > end_of_buf) {
5264                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5265                                  end_of_buf);
5266                         break;
5267                 }
5268
5269                 *lastentry = entryptr;
5270                 entrycount++;
5271
5272                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5273                 if (!next_offset)
5274                         break;
5275         }
5276
5277         return entrycount;
5278 }
5279
5280 /*
5281  * Readdir/FindFirst
5282  */
5283 int SMB2_query_directory_init(const unsigned int xid,
5284                               struct cifs_tcon *tcon,
5285                               struct TCP_Server_Info *server,
5286                               struct smb_rqst *rqst,
5287                               u64 persistent_fid, u64 volatile_fid,
5288                               int index, int info_level)
5289 {
5290         struct smb2_query_directory_req *req;
5291         unsigned char *bufptr;
5292         __le16 asteriks = cpu_to_le16('*');
5293         unsigned int output_size = CIFSMaxBufSize -
5294                 MAX_SMB2_CREATE_RESPONSE_SIZE -
5295                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5296         unsigned int total_len;
5297         struct kvec *iov = rqst->rq_iov;
5298         int len, rc;
5299
5300         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5301                                  (void **) &req, &total_len);
5302         if (rc)
5303                 return rc;
5304
5305         switch (info_level) {
5306         case SMB_FIND_FILE_DIRECTORY_INFO:
5307                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5308                 break;
5309         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5310                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5311                 break;
5312         case SMB_FIND_FILE_POSIX_INFO:
5313                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5314                 break;
5315         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5316                 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5317                 break;
5318         default:
5319                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5320                         info_level);
5321                 return -EINVAL;
5322         }
5323
5324         req->FileIndex = cpu_to_le32(index);
5325         req->PersistentFileId = persistent_fid;
5326         req->VolatileFileId = volatile_fid;
5327
5328         len = 0x2;
5329         bufptr = req->Buffer;
5330         memcpy(bufptr, &asteriks, len);
5331
5332         req->FileNameOffset =
5333                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5334         req->FileNameLength = cpu_to_le16(len);
5335         /*
5336          * BB could be 30 bytes or so longer if we used SMB2 specific
5337          * buffer lengths, but this is safe and close enough.
5338          */
5339         output_size = min_t(unsigned int, output_size, server->maxBuf);
5340         output_size = min_t(unsigned int, output_size, 2 << 15);
5341         req->OutputBufferLength = cpu_to_le32(output_size);
5342
5343         iov[0].iov_base = (char *)req;
5344         /* 1 for Buffer */
5345         iov[0].iov_len = total_len - 1;
5346
5347         iov[1].iov_base = (char *)(req->Buffer);
5348         iov[1].iov_len = len;
5349
5350         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5351                         tcon->ses->Suid, index, output_size);
5352
5353         return 0;
5354 }
5355
5356 void SMB2_query_directory_free(struct smb_rqst *rqst)
5357 {
5358         if (rqst && rqst->rq_iov) {
5359                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5360         }
5361 }
5362
5363 int
5364 smb2_parse_query_directory(struct cifs_tcon *tcon,
5365                            struct kvec *rsp_iov,
5366                            int resp_buftype,
5367                            struct cifs_search_info *srch_inf)
5368 {
5369         struct smb2_query_directory_rsp *rsp;
5370         size_t info_buf_size;
5371         char *end_of_smb;
5372         int rc;
5373
5374         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5375
5376         switch (srch_inf->info_level) {
5377         case SMB_FIND_FILE_DIRECTORY_INFO:
5378                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5379                 break;
5380         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5381                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5382                 break;
5383         case SMB_FIND_FILE_POSIX_INFO:
5384                 /* note that posix payload are variable size */
5385                 info_buf_size = sizeof(struct smb2_posix_info);
5386                 break;
5387         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5388                 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5389                 break;
5390         default:
5391                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5392                          srch_inf->info_level);
5393                 return -EINVAL;
5394         }
5395
5396         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5397                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5398                                info_buf_size);
5399         if (rc) {
5400                 cifs_tcon_dbg(VFS, "bad info payload");
5401                 return rc;
5402         }
5403
5404         srch_inf->unicode = true;
5405
5406         if (srch_inf->ntwrk_buf_start) {
5407                 if (srch_inf->smallBuf)
5408                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5409                 else
5410                         cifs_buf_release(srch_inf->ntwrk_buf_start);
5411         }
5412         srch_inf->ntwrk_buf_start = (char *)rsp;
5413         srch_inf->srch_entries_start = srch_inf->last_entry =
5414                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5415         end_of_smb = rsp_iov->iov_len + (char *)rsp;
5416
5417         srch_inf->entries_in_buffer = num_entries(
5418                 srch_inf->info_level,
5419                 srch_inf->srch_entries_start,
5420                 end_of_smb,
5421                 &srch_inf->last_entry,
5422                 info_buf_size);
5423
5424         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5425         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5426                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5427                  srch_inf->srch_entries_start, srch_inf->last_entry);
5428         if (resp_buftype == CIFS_LARGE_BUFFER)
5429                 srch_inf->smallBuf = false;
5430         else if (resp_buftype == CIFS_SMALL_BUFFER)
5431                 srch_inf->smallBuf = true;
5432         else
5433                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5434
5435         return 0;
5436 }
5437
5438 int
5439 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5440                      u64 persistent_fid, u64 volatile_fid, int index,
5441                      struct cifs_search_info *srch_inf)
5442 {
5443         struct smb_rqst rqst;
5444         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5445         struct smb2_query_directory_rsp *rsp = NULL;
5446         int resp_buftype = CIFS_NO_BUFFER;
5447         struct kvec rsp_iov;
5448         int rc = 0;
5449         struct cifs_ses *ses = tcon->ses;
5450         struct TCP_Server_Info *server;
5451         int flags = 0;
5452         int retries = 0, cur_sleep = 1;
5453
5454 replay_again:
5455         /* reinitialize for possible replay */
5456         flags = 0;
5457         server = cifs_pick_channel(ses);
5458
5459         if (!ses || !(ses->server))
5460                 return -EIO;
5461
5462         if (smb3_encryption_required(tcon))
5463                 flags |= CIFS_TRANSFORM_REQ;
5464
5465         memset(&rqst, 0, sizeof(struct smb_rqst));
5466         memset(&iov, 0, sizeof(iov));
5467         rqst.rq_iov = iov;
5468         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5469
5470         rc = SMB2_query_directory_init(xid, tcon, server,
5471                                        &rqst, persistent_fid,
5472                                        volatile_fid, index,
5473                                        srch_inf->info_level);
5474         if (rc)
5475                 goto qdir_exit;
5476
5477         if (retries)
5478                 smb2_set_replay(server, &rqst);
5479
5480         rc = cifs_send_recv(xid, ses, server,
5481                             &rqst, &resp_buftype, flags, &rsp_iov);
5482         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5483
5484         if (rc) {
5485                 if (rc == -ENODATA &&
5486                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5487                         trace_smb3_query_dir_done(xid, persistent_fid,
5488                                 tcon->tid, tcon->ses->Suid, index, 0);
5489                         srch_inf->endOfSearch = true;
5490                         rc = 0;
5491                 } else {
5492                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5493                                 tcon->ses->Suid, index, 0, rc);
5494                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5495                 }
5496                 goto qdir_exit;
5497         }
5498
5499         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5500                                         srch_inf);
5501         if (rc) {
5502                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5503                         tcon->ses->Suid, index, 0, rc);
5504                 goto qdir_exit;
5505         }
5506         resp_buftype = CIFS_NO_BUFFER;
5507
5508         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5509                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5510
5511 qdir_exit:
5512         SMB2_query_directory_free(&rqst);
5513         free_rsp_buf(resp_buftype, rsp);
5514
5515         if (is_replayable_error(rc) &&
5516             smb2_should_replay(tcon, &retries, &cur_sleep))
5517                 goto replay_again;
5518
5519         return rc;
5520 }
5521
5522 int
5523 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5524                    struct smb_rqst *rqst,
5525                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5526                    u8 info_class, u8 info_type, u32 additional_info,
5527                    void **data, unsigned int *size)
5528 {
5529         struct smb2_set_info_req *req;
5530         struct kvec *iov = rqst->rq_iov;
5531         unsigned int i, total_len;
5532         int rc;
5533
5534         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5535                                  (void **) &req, &total_len);
5536         if (rc)
5537                 return rc;
5538
5539         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5540         req->InfoType = info_type;
5541         req->FileInfoClass = info_class;
5542         req->PersistentFileId = persistent_fid;
5543         req->VolatileFileId = volatile_fid;
5544         req->AdditionalInformation = cpu_to_le32(additional_info);
5545
5546         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5547         req->BufferLength = cpu_to_le32(*size);
5548
5549         memcpy(req->Buffer, *data, *size);
5550         total_len += *size;
5551
5552         iov[0].iov_base = (char *)req;
5553         /* 1 for Buffer */
5554         iov[0].iov_len = total_len - 1;
5555
5556         for (i = 1; i < rqst->rq_nvec; i++) {
5557                 le32_add_cpu(&req->BufferLength, size[i]);
5558                 iov[i].iov_base = (char *)data[i];
5559                 iov[i].iov_len = size[i];
5560         }
5561
5562         return 0;
5563 }
5564
5565 void
5566 SMB2_set_info_free(struct smb_rqst *rqst)
5567 {
5568         if (rqst && rqst->rq_iov)
5569                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5570 }
5571
5572 static int
5573 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5574                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5575                u8 info_type, u32 additional_info, unsigned int num,
5576                 void **data, unsigned int *size)
5577 {
5578         struct smb_rqst rqst;
5579         struct smb2_set_info_rsp *rsp = NULL;
5580         struct kvec *iov;
5581         struct kvec rsp_iov;
5582         int rc = 0;
5583         int resp_buftype;
5584         struct cifs_ses *ses = tcon->ses;
5585         struct TCP_Server_Info *server;
5586         int flags = 0;
5587         int retries = 0, cur_sleep = 1;
5588
5589 replay_again:
5590         /* reinitialize for possible replay */
5591         flags = 0;
5592         server = cifs_pick_channel(ses);
5593
5594         if (!ses || !server)
5595                 return -EIO;
5596
5597         if (!num)
5598                 return -EINVAL;
5599
5600         if (smb3_encryption_required(tcon))
5601                 flags |= CIFS_TRANSFORM_REQ;
5602
5603         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5604         if (!iov)
5605                 return -ENOMEM;
5606
5607         memset(&rqst, 0, sizeof(struct smb_rqst));
5608         rqst.rq_iov = iov;
5609         rqst.rq_nvec = num;
5610
5611         rc = SMB2_set_info_init(tcon, server,
5612                                 &rqst, persistent_fid, volatile_fid, pid,
5613                                 info_class, info_type, additional_info,
5614                                 data, size);
5615         if (rc) {
5616                 kfree(iov);
5617                 return rc;
5618         }
5619
5620         if (retries)
5621                 smb2_set_replay(server, &rqst);
5622
5623         rc = cifs_send_recv(xid, ses, server,
5624                             &rqst, &resp_buftype, flags,
5625                             &rsp_iov);
5626         SMB2_set_info_free(&rqst);
5627         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5628
5629         if (rc != 0) {
5630                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5631                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5632                                 ses->Suid, info_class, (__u32)info_type, rc);
5633         }
5634
5635         free_rsp_buf(resp_buftype, rsp);
5636         kfree(iov);
5637
5638         if (is_replayable_error(rc) &&
5639             smb2_should_replay(tcon, &retries, &cur_sleep))
5640                 goto replay_again;
5641
5642         return rc;
5643 }
5644
5645 int
5646 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5647              u64 volatile_fid, u32 pid, loff_t new_eof)
5648 {
5649         struct smb2_file_eof_info info;
5650         void *data;
5651         unsigned int size;
5652
5653         info.EndOfFile = cpu_to_le64(new_eof);
5654
5655         data = &info;
5656         size = sizeof(struct smb2_file_eof_info);
5657
5658         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5659
5660         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5661                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5662                         0, 1, &data, &size);
5663 }
5664
5665 int
5666 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5667                 u64 persistent_fid, u64 volatile_fid,
5668                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5669 {
5670         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5671                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5672                         1, (void **)&pnntsd, &pacllen);
5673 }
5674
5675 int
5676 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5677             u64 persistent_fid, u64 volatile_fid,
5678             struct smb2_file_full_ea_info *buf, int len)
5679 {
5680         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5681                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5682                 0, 1, (void **)&buf, &len);
5683 }
5684
5685 int
5686 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5687                   const u64 persistent_fid, const u64 volatile_fid,
5688                   __u8 oplock_level)
5689 {
5690         struct smb_rqst rqst;
5691         int rc;
5692         struct smb2_oplock_break *req = NULL;
5693         struct cifs_ses *ses = tcon->ses;
5694         struct TCP_Server_Info *server;
5695         int flags = CIFS_OBREAK_OP;
5696         unsigned int total_len;
5697         struct kvec iov[1];
5698         struct kvec rsp_iov;
5699         int resp_buf_type;
5700         int retries = 0, cur_sleep = 1;
5701
5702 replay_again:
5703         /* reinitialize for possible replay */
5704         flags = CIFS_OBREAK_OP;
5705         server = cifs_pick_channel(ses);
5706
5707         cifs_dbg(FYI, "SMB2_oplock_break\n");
5708         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5709                                  (void **) &req, &total_len);
5710         if (rc)
5711                 return rc;
5712
5713         if (smb3_encryption_required(tcon))
5714                 flags |= CIFS_TRANSFORM_REQ;
5715
5716         req->VolatileFid = volatile_fid;
5717         req->PersistentFid = persistent_fid;
5718         req->OplockLevel = oplock_level;
5719         req->hdr.CreditRequest = cpu_to_le16(1);
5720
5721         flags |= CIFS_NO_RSP_BUF;
5722
5723         iov[0].iov_base = (char *)req;
5724         iov[0].iov_len = total_len;
5725
5726         memset(&rqst, 0, sizeof(struct smb_rqst));
5727         rqst.rq_iov = iov;
5728         rqst.rq_nvec = 1;
5729
5730         if (retries)
5731                 smb2_set_replay(server, &rqst);
5732
5733         rc = cifs_send_recv(xid, ses, server,
5734                             &rqst, &resp_buf_type, flags, &rsp_iov);
5735         cifs_small_buf_release(req);
5736         if (rc) {
5737                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5738                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5739         }
5740
5741         if (is_replayable_error(rc) &&
5742             smb2_should_replay(tcon, &retries, &cur_sleep))
5743                 goto replay_again;
5744
5745         return rc;
5746 }
5747
5748 void
5749 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5750                              struct kstatfs *kst)
5751 {
5752         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5753                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5754         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5755         kst->f_bfree  = kst->f_bavail =
5756                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5757         return;
5758 }
5759
5760 static void
5761 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5762                         struct kstatfs *kst)
5763 {
5764         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5765         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5766         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5767         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5768                 kst->f_bavail = kst->f_bfree;
5769         else
5770                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5771         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5772                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5773         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5774                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5775
5776         return;
5777 }
5778
5779 static int
5780 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5781                    struct TCP_Server_Info *server,
5782                    int level, int outbuf_len, u64 persistent_fid,
5783                    u64 volatile_fid)
5784 {
5785         int rc;
5786         struct smb2_query_info_req *req;
5787         unsigned int total_len;
5788
5789         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5790
5791         if ((tcon->ses == NULL) || server == NULL)
5792                 return -EIO;
5793
5794         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5795                                  (void **) &req, &total_len);
5796         if (rc)
5797                 return rc;
5798
5799         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5800         req->FileInfoClass = level;
5801         req->PersistentFileId = persistent_fid;
5802         req->VolatileFileId = volatile_fid;
5803         /* 1 for pad */
5804         req->InputBufferOffset =
5805                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5806         req->OutputBufferLength = cpu_to_le32(
5807                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5808
5809         iov->iov_base = (char *)req;
5810         iov->iov_len = total_len;
5811         return 0;
5812 }
5813
5814 static inline void free_qfs_info_req(struct kvec *iov)
5815 {
5816         cifs_buf_release(iov->iov_base);
5817 }
5818
5819 int
5820 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5821               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5822 {
5823         struct smb_rqst rqst;
5824         struct smb2_query_info_rsp *rsp = NULL;
5825         struct kvec iov;
5826         struct kvec rsp_iov;
5827         int rc = 0;
5828         int resp_buftype;
5829         struct cifs_ses *ses = tcon->ses;
5830         struct TCP_Server_Info *server;
5831         FILE_SYSTEM_POSIX_INFO *info = NULL;
5832         int flags = 0;
5833         int retries = 0, cur_sleep = 1;
5834
5835 replay_again:
5836         /* reinitialize for possible replay */
5837         flags = 0;
5838         server = cifs_pick_channel(ses);
5839
5840         rc = build_qfs_info_req(&iov, tcon, server,
5841                                 FS_POSIX_INFORMATION,
5842                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5843                                 persistent_fid, volatile_fid);
5844         if (rc)
5845                 return rc;
5846
5847         if (smb3_encryption_required(tcon))
5848                 flags |= CIFS_TRANSFORM_REQ;
5849
5850         memset(&rqst, 0, sizeof(struct smb_rqst));
5851         rqst.rq_iov = &iov;
5852         rqst.rq_nvec = 1;
5853
5854         if (retries)
5855                 smb2_set_replay(server, &rqst);
5856
5857         rc = cifs_send_recv(xid, ses, server,
5858                             &rqst, &resp_buftype, flags, &rsp_iov);
5859         free_qfs_info_req(&iov);
5860         if (rc) {
5861                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5862                 goto posix_qfsinf_exit;
5863         }
5864         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5865
5866         info = (FILE_SYSTEM_POSIX_INFO *)(
5867                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5868         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5869                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5870                                sizeof(FILE_SYSTEM_POSIX_INFO));
5871         if (!rc)
5872                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5873
5874 posix_qfsinf_exit:
5875         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5876
5877         if (is_replayable_error(rc) &&
5878             smb2_should_replay(tcon, &retries, &cur_sleep))
5879                 goto replay_again;
5880
5881         return rc;
5882 }
5883
5884 int
5885 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5886               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5887 {
5888         struct smb_rqst rqst;
5889         struct smb2_query_info_rsp *rsp = NULL;
5890         struct kvec iov;
5891         struct kvec rsp_iov;
5892         int rc = 0;
5893         int resp_buftype;
5894         struct cifs_ses *ses = tcon->ses;
5895         struct TCP_Server_Info *server;
5896         struct smb2_fs_full_size_info *info = NULL;
5897         int flags = 0;
5898         int retries = 0, cur_sleep = 1;
5899
5900 replay_again:
5901         /* reinitialize for possible replay */
5902         flags = 0;
5903         server = cifs_pick_channel(ses);
5904
5905         rc = build_qfs_info_req(&iov, tcon, server,
5906                                 FS_FULL_SIZE_INFORMATION,
5907                                 sizeof(struct smb2_fs_full_size_info),
5908                                 persistent_fid, volatile_fid);
5909         if (rc)
5910                 return rc;
5911
5912         if (smb3_encryption_required(tcon))
5913                 flags |= CIFS_TRANSFORM_REQ;
5914
5915         memset(&rqst, 0, sizeof(struct smb_rqst));
5916         rqst.rq_iov = &iov;
5917         rqst.rq_nvec = 1;
5918
5919         if (retries)
5920                 smb2_set_replay(server, &rqst);
5921
5922         rc = cifs_send_recv(xid, ses, server,
5923                             &rqst, &resp_buftype, flags, &rsp_iov);
5924         free_qfs_info_req(&iov);
5925         if (rc) {
5926                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5927                 goto qfsinf_exit;
5928         }
5929         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5930
5931         info = (struct smb2_fs_full_size_info *)(
5932                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5933         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5934                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5935                                sizeof(struct smb2_fs_full_size_info));
5936         if (!rc)
5937                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5938
5939 qfsinf_exit:
5940         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5941
5942         if (is_replayable_error(rc) &&
5943             smb2_should_replay(tcon, &retries, &cur_sleep))
5944                 goto replay_again;
5945
5946         return rc;
5947 }
5948
5949 int
5950 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5951               u64 persistent_fid, u64 volatile_fid, int level)
5952 {
5953         struct smb_rqst rqst;
5954         struct smb2_query_info_rsp *rsp = NULL;
5955         struct kvec iov;
5956         struct kvec rsp_iov;
5957         int rc = 0;
5958         int resp_buftype, max_len, min_len;
5959         struct cifs_ses *ses = tcon->ses;
5960         struct TCP_Server_Info *server;
5961         unsigned int rsp_len, offset;
5962         int flags = 0;
5963         int retries = 0, cur_sleep = 1;
5964
5965 replay_again:
5966         /* reinitialize for possible replay */
5967         flags = 0;
5968         server = cifs_pick_channel(ses);
5969
5970         if (level == FS_DEVICE_INFORMATION) {
5971                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5972                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5973         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5974                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5975                 min_len = MIN_FS_ATTR_INFO_SIZE;
5976         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5977                 max_len = sizeof(struct smb3_fs_ss_info);
5978                 min_len = sizeof(struct smb3_fs_ss_info);
5979         } else if (level == FS_VOLUME_INFORMATION) {
5980                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5981                 min_len = sizeof(struct smb3_fs_vol_info);
5982         } else {
5983                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5984                 return -EINVAL;
5985         }
5986
5987         rc = build_qfs_info_req(&iov, tcon, server,
5988                                 level, max_len,
5989                                 persistent_fid, volatile_fid);
5990         if (rc)
5991                 return rc;
5992
5993         if (smb3_encryption_required(tcon))
5994                 flags |= CIFS_TRANSFORM_REQ;
5995
5996         memset(&rqst, 0, sizeof(struct smb_rqst));
5997         rqst.rq_iov = &iov;
5998         rqst.rq_nvec = 1;
5999
6000         if (retries)
6001                 smb2_set_replay(server, &rqst);
6002
6003         rc = cifs_send_recv(xid, ses, server,
6004                             &rqst, &resp_buftype, flags, &rsp_iov);
6005         free_qfs_info_req(&iov);
6006         if (rc) {
6007                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6008                 goto qfsattr_exit;
6009         }
6010         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6011
6012         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6013         offset = le16_to_cpu(rsp->OutputBufferOffset);
6014         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6015         if (rc)
6016                 goto qfsattr_exit;
6017
6018         if (level == FS_ATTRIBUTE_INFORMATION)
6019                 memcpy(&tcon->fsAttrInfo, offset
6020                         + (char *)rsp, min_t(unsigned int,
6021                         rsp_len, max_len));
6022         else if (level == FS_DEVICE_INFORMATION)
6023                 memcpy(&tcon->fsDevInfo, offset
6024                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6025         else if (level == FS_SECTOR_SIZE_INFORMATION) {
6026                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6027                         (offset + (char *)rsp);
6028                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6029                 tcon->perf_sector_size =
6030                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6031         } else if (level == FS_VOLUME_INFORMATION) {
6032                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6033                         (offset + (char *)rsp);
6034                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6035                 tcon->vol_create_time = vol_info->VolumeCreationTime;
6036         }
6037
6038 qfsattr_exit:
6039         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6040
6041         if (is_replayable_error(rc) &&
6042             smb2_should_replay(tcon, &retries, &cur_sleep))
6043                 goto replay_again;
6044
6045         return rc;
6046 }
6047
6048 int
6049 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6050            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6051            const __u32 num_lock, struct smb2_lock_element *buf)
6052 {
6053         struct smb_rqst rqst;
6054         int rc = 0;
6055         struct smb2_lock_req *req = NULL;
6056         struct kvec iov[2];
6057         struct kvec rsp_iov;
6058         int resp_buf_type;
6059         unsigned int count;
6060         int flags = CIFS_NO_RSP_BUF;
6061         unsigned int total_len;
6062         struct TCP_Server_Info *server;
6063         int retries = 0, cur_sleep = 1;
6064
6065 replay_again:
6066         /* reinitialize for possible replay */
6067         flags = CIFS_NO_RSP_BUF;
6068         server = cifs_pick_channel(tcon->ses);
6069
6070         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6071
6072         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6073                                  (void **) &req, &total_len);
6074         if (rc)
6075                 return rc;
6076
6077         if (smb3_encryption_required(tcon))
6078                 flags |= CIFS_TRANSFORM_REQ;
6079
6080         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6081         req->LockCount = cpu_to_le16(num_lock);
6082
6083         req->PersistentFileId = persist_fid;
6084         req->VolatileFileId = volatile_fid;
6085
6086         count = num_lock * sizeof(struct smb2_lock_element);
6087
6088         iov[0].iov_base = (char *)req;
6089         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6090         iov[1].iov_base = (char *)buf;
6091         iov[1].iov_len = count;
6092
6093         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6094
6095         memset(&rqst, 0, sizeof(struct smb_rqst));
6096         rqst.rq_iov = iov;
6097         rqst.rq_nvec = 2;
6098
6099         if (retries)
6100                 smb2_set_replay(server, &rqst);
6101
6102         rc = cifs_send_recv(xid, tcon->ses, server,
6103                             &rqst, &resp_buf_type, flags,
6104                             &rsp_iov);
6105         cifs_small_buf_release(req);
6106         if (rc) {
6107                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6108                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6109                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6110                                     tcon->ses->Suid, rc);
6111         }
6112
6113         if (is_replayable_error(rc) &&
6114             smb2_should_replay(tcon, &retries, &cur_sleep))
6115                 goto replay_again;
6116
6117         return rc;
6118 }
6119
6120 int
6121 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6122           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6123           const __u64 length, const __u64 offset, const __u32 lock_flags,
6124           const bool wait)
6125 {
6126         struct smb2_lock_element lock;
6127
6128         lock.Offset = cpu_to_le64(offset);
6129         lock.Length = cpu_to_le64(length);
6130         lock.Flags = cpu_to_le32(lock_flags);
6131         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6132                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6133
6134         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6135 }
6136
6137 int
6138 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6139                  __u8 *lease_key, const __le32 lease_state)
6140 {
6141         struct smb_rqst rqst;
6142         int rc;
6143         struct smb2_lease_ack *req = NULL;
6144         struct cifs_ses *ses = tcon->ses;
6145         int flags = CIFS_OBREAK_OP;
6146         unsigned int total_len;
6147         struct kvec iov[1];
6148         struct kvec rsp_iov;
6149         int resp_buf_type;
6150         __u64 *please_key_high;
6151         __u64 *please_key_low;
6152         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6153
6154         cifs_dbg(FYI, "SMB2_lease_break\n");
6155         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6156                                  (void **) &req, &total_len);
6157         if (rc)
6158                 return rc;
6159
6160         if (smb3_encryption_required(tcon))
6161                 flags |= CIFS_TRANSFORM_REQ;
6162
6163         req->hdr.CreditRequest = cpu_to_le16(1);
6164         req->StructureSize = cpu_to_le16(36);
6165         total_len += 12;
6166
6167         memcpy(req->LeaseKey, lease_key, 16);
6168         req->LeaseState = lease_state;
6169
6170         flags |= CIFS_NO_RSP_BUF;
6171
6172         iov[0].iov_base = (char *)req;
6173         iov[0].iov_len = total_len;
6174
6175         memset(&rqst, 0, sizeof(struct smb_rqst));
6176         rqst.rq_iov = iov;
6177         rqst.rq_nvec = 1;
6178
6179         rc = cifs_send_recv(xid, ses, server,
6180                             &rqst, &resp_buf_type, flags, &rsp_iov);
6181         cifs_small_buf_release(req);
6182
6183         please_key_low = (__u64 *)lease_key;
6184         please_key_high = (__u64 *)(lease_key+8);
6185         if (rc) {
6186                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6187                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6188                         ses->Suid, *please_key_low, *please_key_high, rc);
6189                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6190         } else
6191                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6192                         ses->Suid, *please_key_low, *please_key_high);
6193
6194         return rc;
6195 }