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