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 "smb2pdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsacl.h"
  29 #include "cifsproto.h"
  30 #include "smb2proto.h"
  31 #include "cifs_unicode.h"
  32 #include "cifs_debug.h"
  33 #include "ntlmssp.h"
  34 #include "smb2status.h"
  35 #include "smb2glob.h"
  36 #include "cifspdu.h"
  37 #include "cifs_spnego.h"
  38 #include "smbdirect.h"
  39 #include "trace.h"
  40 #ifdef CONFIG_CIFS_DFS_UPCALL
  41 #include "dfs_cache.h"
  42 #endif
  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_sync_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->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->TreeId = tcon->tid;
 119         /* Uid is not converted */
 120         if (tcon->ses)
 121                 shdr->SessionId = 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;
 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         if (smb2_command == SMB2_TREE_CONNECT)
 160                 return 0;
 161
 162         if (tcon->tidStatus == CifsExiting) {
 163                 /*
 164                  * only tree disconnect, open, and write,
 165                  * (and ulogoff which does not have tcon)
 166                  * are allowed as we start force umount.
 167                  */
 168                 if ((smb2_command != SMB2_WRITE) &&
 169                    (smb2_command != SMB2_CREATE) &&
 170                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 171                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 172                                  smb2_command);
 173                         return -ENODEV;
 174                 }
 175         }
 176         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 177             (!tcon->ses->server) || !server)
 178                 return -EIO;
 179
 180         ses = tcon->ses;
 181         retries = server->nr_targets;
 182
 183         /*
 184          * Give demultiplex thread up to 10 seconds to each target available for
 185          * reconnect -- should be greater than cifs socket timeout which is 7
 186          * seconds.
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 rc = wait_event_interruptible_timeout(server->response_q,
 205                                                       (server->tcpStatus != CifsNeedReconnect),
 206                                                       10 * HZ);
 207                 if (rc < 0) {
 208                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 209                                  __func__);
 210                         return -ERESTARTSYS;
 211                 }
 212
 213                 /* are we still trying to reconnect? */
 214                 if (server->tcpStatus != CifsNeedReconnect)
 215                         break;
 216
 217                 if (retries && --retries)
 218                         continue;
 219
 220                 /*
 221                  * on "soft" mounts we wait once. Hard mounts keep
 222                  * retrying until process is killed or server comes
 223                  * back on-line
 224                  */
 225                 if (!tcon->retry) {
 226                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 227                         return -EHOSTDOWN;
 228                 }
 229                 retries = server->nr_targets;
 230         }
 231
 232         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 233                 return 0;
 234
 235         nls_codepage = load_nls_default();
 236
 237         /*
 238          * need to prevent multiple threads trying to simultaneously reconnect
 239          * the same SMB session
 240          */
 241         mutex_lock(&tcon->ses->session_mutex);
 242
 243         /*
 244          * Recheck after acquire mutex. If another thread is negotiating
 245          * and the server never sends an answer the socket will be closed
 246          * and tcpStatus set to reconnect.
 247          */
 248         if (server->tcpStatus == CifsNeedReconnect) {
 249                 rc = -EHOSTDOWN;
 250                 mutex_unlock(&tcon->ses->session_mutex);
 251                 goto out;
 252         }
 253
 254         /*
 255          * If we are reconnecting an extra channel, bind
 256          */
 257         if (server->is_channel) {
 258                 ses->binding = true;
 259                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 260         }
 261
 262         rc = cifs_negotiate_protocol(0, tcon->ses);
 263         if (!rc && tcon->ses->need_reconnect) {
 264                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 265                 if ((rc == -EACCES) && !tcon->retry) {
 266                         rc = -EHOSTDOWN;
 267                         ses->binding = false;
 268                         ses->binding_chan = NULL;
 269                         mutex_unlock(&tcon->ses->session_mutex);
 270                         goto failed;
 271                 }
 272         }
 273         /*
 274          * End of channel binding
 275          */
 276         ses->binding = false;
 277         ses->binding_chan = NULL;
 278
 279         if (rc || !tcon->need_reconnect) {
 280                 mutex_unlock(&tcon->ses->session_mutex);
 281                 goto out;
 282         }
 283
 284         cifs_mark_open_files_invalid(tcon);
 285         if (tcon->use_persistent)
 286                 tcon->need_reopen_files = true;
 287
 288         rc = cifs_tree_connect(0, tcon, nls_codepage);
 289         mutex_unlock(&tcon->ses->session_mutex);
 290
 291         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 292         if (rc) {
 293                 /* If sess reconnected but tcon didn't, something strange ... */
 294                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 295                 goto out;
 296         }
 297
 298         if (smb2_command != SMB2_INTERNAL_CMD)
 299                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 300
 301         atomic_inc(&tconInfoReconnectCount);
 302 out:
 303         /*
 304          * Check if handle based operation so we know whether we can continue
 305          * or not without returning to caller to reset file handle.
 306          */
 307         /*
 308          * BB Is flush done by server on drop of tcp session? Should we special
 309          * case it and skip above?
 310          */
 311         switch (smb2_command) {
 312         case SMB2_FLUSH:
 313         case SMB2_READ:
 314         case SMB2_WRITE:
 315         case SMB2_LOCK:
 316         case SMB2_IOCTL:
 317         case SMB2_QUERY_DIRECTORY:
 318         case SMB2_CHANGE_NOTIFY:
 319         case SMB2_QUERY_INFO:
 320         case SMB2_SET_INFO:
 321                 rc = -EAGAIN;
 322         }
 323 failed:
 324         unload_nls(nls_codepage);
 325         return rc;
 326 }
 327
 328 static void
 329 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 330                struct TCP_Server_Info *server,
 331                void *buf,
 332                unsigned int *total_len)
 333 {
 334         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 335         /* lookup word count ie StructureSize from table */
 336         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 337
 338         /*
 339          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 340          * largest operations (Create)
 341          */
 342         memset(buf, 0, 256);
 343
 344         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 345         spdu->StructureSize2 = cpu_to_le16(parmsize);
 346
 347         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 348 }
 349
 350 /*
 351  * Allocate and return pointer to an SMB request hdr, and set basic
 352  * SMB information in the SMB header. If the return code is zero, this
 353  * function must have filled in request_buf pointer.
 354  */
 355 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 356                                  struct TCP_Server_Info *server,
 357                                  void **request_buf, unsigned int *total_len)
 358 {
 359         /* BB eventually switch this to SMB2 specific small buf size */
 360         if (smb2_command == SMB2_SET_INFO)
 361                 *request_buf = cifs_buf_get();
 362         else
 363                 *request_buf = cifs_small_buf_get();
 364         if (*request_buf == NULL) {
 365                 /* BB should we add a retry in here if not a writepage? */
 366                 return -ENOMEM;
 367         }
 368
 369         fill_small_buf(smb2_command, tcon, server,
 370                        (struct smb2_sync_hdr *)(*request_buf),
 371                        total_len);
 372
 373         if (tcon != NULL) {
 374                 uint16_t com_code = le16_to_cpu(smb2_command);
 375                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 376                 cifs_stats_inc(&tcon->num_smbs_sent);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 383                                struct TCP_Server_Info *server,
 384                                void **request_buf, unsigned int *total_len)
 385 {
 386         int rc;
 387
 388         rc = smb2_reconnect(smb2_command, tcon, server);
 389         if (rc)
 390                 return rc;
 391
 392         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 393                                      total_len);
 394 }
 395
 396 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 397                                struct TCP_Server_Info *server,
 398                                void **request_buf, unsigned int *total_len)
 399 {
 400         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 401         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 402                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 403                                              request_buf, total_len);
 404         }
 405         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 406                                    request_buf, total_len);
 407 }
 408
 409 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 410
 411 static void
 412 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 413 {
 414         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 415         pneg_ctxt->DataLength = cpu_to_le16(38);
 416         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 417         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 418         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 419         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 420 }
 421
 422 static void
 423 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 424 {
 425         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 426         pneg_ctxt->DataLength =
 427                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 428                           - sizeof(struct smb2_neg_context));
 429         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 430         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 431         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 432         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 433 }
 434
 435 static unsigned int
 436 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 437 {
 438         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 439         unsigned short num_algs = 1; /* number of signing algorithms sent */
 440
 441         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 442         /*
 443          * Context Data length must be rounded to multiple of 8 for some servers
 444          */
 445         pneg_ctxt->DataLength = cpu_to_le16(DIV_ROUND_UP(
 446                                 sizeof(struct smb2_signing_capabilities) -
 447                                 sizeof(struct smb2_neg_context) +
 448                                 (num_algs * 2 /* sizeof u16 */), 8) * 8);
 449         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 450         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 451
 452         ctxt_len += 2 /* sizeof le16 */ * num_algs;
 453         ctxt_len = DIV_ROUND_UP(ctxt_len, 8) * 8;
 454         return ctxt_len;
 455         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 456 }
 457
 458 static void
 459 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 460 {
 461         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 462         if (require_gcm_256) {
 463                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 464                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 465                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 466         } else if (enable_gcm_256) {
 467                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 468                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 469                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 470                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 471                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 472         } else {
 473                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 474                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 475                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 476                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 477         }
 478 }
 479
 480 static unsigned int
 481 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 482 {
 483         struct nls_table *cp = load_nls_default();
 484
 485         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 486
 487         /* copy up to max of first 100 bytes of server name to NetName field */
 488         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 489         /* context size is DataLength + minimal smb2_neg_context */
 490         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 491                         sizeof(struct smb2_neg_context), 8) * 8;
 492 }
 493
 494 static void
 495 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 496 {
 497         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 498         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 499         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 500         pneg_ctxt->Name[0] = 0x93;
 501         pneg_ctxt->Name[1] = 0xAD;
 502         pneg_ctxt->Name[2] = 0x25;
 503         pneg_ctxt->Name[3] = 0x50;
 504         pneg_ctxt->Name[4] = 0x9C;
 505         pneg_ctxt->Name[5] = 0xB4;
 506         pneg_ctxt->Name[6] = 0x11;
 507         pneg_ctxt->Name[7] = 0xE7;
 508         pneg_ctxt->Name[8] = 0xB4;
 509         pneg_ctxt->Name[9] = 0x23;
 510         pneg_ctxt->Name[10] = 0x83;
 511         pneg_ctxt->Name[11] = 0xDE;
 512         pneg_ctxt->Name[12] = 0x96;
 513         pneg_ctxt->Name[13] = 0x8B;
 514         pneg_ctxt->Name[14] = 0xCD;
 515         pneg_ctxt->Name[15] = 0x7C;
 516 }
 517
 518 static void
 519 assemble_neg_contexts(struct smb2_negotiate_req *req,
 520                       struct TCP_Server_Info *server, unsigned int *total_len)
 521 {
 522         char *pneg_ctxt;
 523         unsigned int ctxt_len, neg_context_count;
 524
 525         if (*total_len > 200) {
 526                 /* In case length corrupted don't want to overrun smb buffer */
 527                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 528                 return;
 529         }
 530
 531         /*
 532          * round up total_len of fixed part of SMB3 negotiate request to 8
 533          * byte boundary before adding negotiate contexts
 534          */
 535         *total_len = roundup(*total_len, 8);
 536
 537         pneg_ctxt = (*total_len) + (char *)req;
 538         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 539
 540         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 541         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 542         *total_len += ctxt_len;
 543         pneg_ctxt += ctxt_len;
 544
 545         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 546         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 547         *total_len += ctxt_len;
 548         pneg_ctxt += ctxt_len;
 549
 550         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 551                                         server->hostname);
 552         *total_len += ctxt_len;
 553         pneg_ctxt += ctxt_len;
 554
 555         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 556         *total_len += sizeof(struct smb2_posix_neg_context);
 557         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 558
 559         neg_context_count = 4;
 560
 561         if (server->compress_algorithm) {
 562                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 563                                 pneg_ctxt);
 564                 ctxt_len = DIV_ROUND_UP(
 565                         sizeof(struct smb2_compression_capabilities_context),
 566                                 8) * 8;
 567                 *total_len += ctxt_len;
 568                 pneg_ctxt += ctxt_len;
 569                 neg_context_count++;
 570         }
 571
 572         if (enable_negotiate_signing) {
 573                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 574                                 pneg_ctxt);
 575                 *total_len += ctxt_len;
 576                 pneg_ctxt += ctxt_len;
 577                 neg_context_count++;
 578         }
 579
 580         /* check for and add transport_capabilities and signing capabilities */
 581         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 582
 583 }
 584
 585 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 586 {
 587         unsigned int len = le16_to_cpu(ctxt->DataLength);
 588
 589         /* If invalid preauth context warn but use what we requested, SHA-512 */
 590         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 591                 pr_warn_once("server sent bad preauth context\n");
 592                 return;
 593         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 594                 pr_warn_once("server sent invalid SaltLength\n");
 595                 return;
 596         }
 597         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 598                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 599         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 600                 pr_warn_once("unknown SMB3 hash algorithm\n");
 601 }
 602
 603 static void decode_compress_ctx(struct TCP_Server_Info *server,
 604                          struct smb2_compression_capabilities_context *ctxt)
 605 {
 606         unsigned int len = le16_to_cpu(ctxt->DataLength);
 607
 608         /* sizeof compress context is a one element compression capbility struct */
 609         if (len < 10) {
 610                 pr_warn_once("server sent bad compression cntxt\n");
 611                 return;
 612         }
 613         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 614                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 615                 return;
 616         }
 617         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 618                 pr_warn_once("unknown compression algorithm\n");
 619                 return;
 620         }
 621         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 622 }
 623
 624 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 625                               struct smb2_encryption_neg_context *ctxt)
 626 {
 627         unsigned int len = le16_to_cpu(ctxt->DataLength);
 628
 629         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 630         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 631                 pr_warn_once("server sent bad crypto ctxt len\n");
 632                 return -EINVAL;
 633         }
 634
 635         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 636                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 637                 return -EINVAL;
 638         }
 639         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 640         if (require_gcm_256) {
 641                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 642                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 643                         return -EOPNOTSUPP;
 644                 }
 645         } else if (ctxt->Ciphers[0] == 0) {
 646                 /*
 647                  * e.g. if server only supported AES256_CCM (very unlikely)
 648                  * or server supported no encryption types or had all disabled.
 649                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 650                  * in which mount requested encryption ("seal") checks later
 651                  * on during tree connection will return proper rc, but if
 652                  * seal not requested by client, since server is allowed to
 653                  * return 0 to indicate no supported cipher, we can't fail here
 654                  */
 655                 server->cipher_type = 0;
 656                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 657                 pr_warn_once("Server does not support requested encryption types\n");
 658                 return 0;
 659         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 660                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 661                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 662                 /* server returned a cipher we didn't ask for */
 663                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 664                 return -EINVAL;
 665         }
 666         server->cipher_type = ctxt->Ciphers[0];
 667         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 668         return 0;
 669 }
 670
 671 static void decode_signing_ctx(struct TCP_Server_Info *server,
 672                                struct smb2_signing_capabilities *pctxt)
 673 {
 674         unsigned int len = le16_to_cpu(pctxt->DataLength);
 675
 676         if ((len < 4) || (len > 16)) {
 677                 pr_warn_once("server sent bad signing negcontext\n");
 678                 return;
 679         }
 680         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 681                 pr_warn_once("Invalid signing algorithm count\n");
 682                 return;
 683         }
 684         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 685                 pr_warn_once("unknown signing algorithm\n");
 686                 return;
 687         }
 688
 689         server->signing_negotiated = true;
 690         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 691         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 692                      server->signing_algorithm);
 693 }
 694
 695
 696 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 697                                      struct TCP_Server_Info *server,
 698                                      unsigned int len_of_smb)
 699 {
 700         struct smb2_neg_context *pctx;
 701         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 702         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 703         unsigned int len_of_ctxts, i;
 704         int rc = 0;
 705
 706         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 707         if (len_of_smb <= offset) {
 708                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 709                 return -EINVAL;
 710         }
 711
 712         len_of_ctxts = len_of_smb - offset;
 713
 714         for (i = 0; i < ctxt_cnt; i++) {
 715                 int clen;
 716                 /* check that offset is not beyond end of SMB */
 717                 if (len_of_ctxts == 0)
 718                         break;
 719
 720                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 721                         break;
 722
 723                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 724                 clen = le16_to_cpu(pctx->DataLength);
 725                 if (clen > len_of_ctxts)
 726                         break;
 727
 728                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 729                         decode_preauth_context(
 730                                 (struct smb2_preauth_neg_context *)pctx);
 731                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 732                         rc = decode_encrypt_ctx(server,
 733                                 (struct smb2_encryption_neg_context *)pctx);
 734                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 735                         decode_compress_ctx(server,
 736                                 (struct smb2_compression_capabilities_context *)pctx);
 737                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 738                         server->posix_ext_supported = true;
 739                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 740                         decode_signing_ctx(server,
 741                                 (struct smb2_signing_capabilities *)pctx);
 742                 else
 743                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 744                                 le16_to_cpu(pctx->ContextType));
 745
 746                 if (rc)
 747                         break;
 748                 /* offsets must be 8 byte aligned */
 749                 clen = (clen + 7) & ~0x7;
 750                 offset += clen + sizeof(struct smb2_neg_context);
 751                 len_of_ctxts -= clen;
 752         }
 753         return rc;
 754 }
 755
 756 static struct create_posix *
 757 create_posix_buf(umode_t mode)
 758 {
 759         struct create_posix *buf;
 760
 761         buf = kzalloc(sizeof(struct create_posix),
 762                         GFP_KERNEL);
 763         if (!buf)
 764                 return NULL;
 765
 766         buf->ccontext.DataOffset =
 767                 cpu_to_le16(offsetof(struct create_posix, Mode));
 768         buf->ccontext.DataLength = cpu_to_le32(4);
 769         buf->ccontext.NameOffset =
 770                 cpu_to_le16(offsetof(struct create_posix, Name));
 771         buf->ccontext.NameLength = cpu_to_le16(16);
 772
 773         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 774         buf->Name[0] = 0x93;
 775         buf->Name[1] = 0xAD;
 776         buf->Name[2] = 0x25;
 777         buf->Name[3] = 0x50;
 778         buf->Name[4] = 0x9C;
 779         buf->Name[5] = 0xB4;
 780         buf->Name[6] = 0x11;
 781         buf->Name[7] = 0xE7;
 782         buf->Name[8] = 0xB4;
 783         buf->Name[9] = 0x23;
 784         buf->Name[10] = 0x83;
 785         buf->Name[11] = 0xDE;
 786         buf->Name[12] = 0x96;
 787         buf->Name[13] = 0x8B;
 788         buf->Name[14] = 0xCD;
 789         buf->Name[15] = 0x7C;
 790         buf->Mode = cpu_to_le32(mode);
 791         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 792         return buf;
 793 }
 794
 795 static int
 796 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 797 {
 798         struct smb2_create_req *req = iov[0].iov_base;
 799         unsigned int num = *num_iovec;
 800
 801         iov[num].iov_base = create_posix_buf(mode);
 802         if (mode == ACL_NO_MODE)
 803                 cifs_dbg(FYI, "Invalid mode\n");
 804         if (iov[num].iov_base == NULL)
 805                 return -ENOMEM;
 806         iov[num].iov_len = sizeof(struct create_posix);
 807         if (!req->CreateContextsOffset)
 808                 req->CreateContextsOffset = cpu_to_le32(
 809                                 sizeof(struct smb2_create_req) +
 810                                 iov[num - 1].iov_len);
 811         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 812         *num_iovec = num + 1;
 813         return 0;
 814 }
 815
 816
 817 /*
 818  *
 819  *      SMB2 Worker functions follow:
 820  *
 821  *      The general structure of the worker functions is:
 822  *      1) Call smb2_init (assembles SMB2 header)
 823  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 824  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 825  *      4) Decode SMB2 command specific fields in the fixed length area
 826  *      5) Decode variable length data area (if any for this SMB2 command type)
 827  *      6) Call free smb buffer
 828  *      7) return
 829  *
 830  */
 831
 832 int
 833 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 834 {
 835         struct smb_rqst rqst;
 836         struct smb2_negotiate_req *req;
 837         struct smb2_negotiate_rsp *rsp;
 838         struct kvec iov[1];
 839         struct kvec rsp_iov;
 840         int rc = 0;
 841         int resp_buftype;
 842         struct TCP_Server_Info *server = cifs_ses_server(ses);
 843         int blob_offset, blob_length;
 844         char *security_blob;
 845         int flags = CIFS_NEG_OP;
 846         unsigned int total_len;
 847
 848         cifs_dbg(FYI, "Negotiate protocol\n");
 849
 850         if (!server) {
 851                 WARN(1, "%s: server is NULL!\n", __func__);
 852                 return -EIO;
 853         }
 854
 855         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 856                                  (void **) &req, &total_len);
 857         if (rc)
 858                 return rc;
 859
 860         req->sync_hdr.SessionId = 0;
 861
 862         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 863         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 864
 865         if (strcmp(server->vals->version_string,
 866                    SMB3ANY_VERSION_STRING) == 0) {
 867                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 868                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 869                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 870                 req->DialectCount = cpu_to_le16(3);
 871                 total_len += 6;
 872         } else if (strcmp(server->vals->version_string,
 873                    SMBDEFAULT_VERSION_STRING) == 0) {
 874                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 875                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 876                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 877                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 878                 req->DialectCount = cpu_to_le16(4);
 879                 total_len += 8;
 880         } else {
 881                 /* otherwise send specific dialect */
 882                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 883                 req->DialectCount = cpu_to_le16(1);
 884                 total_len += 2;
 885         }
 886
 887         /* only one of SMB2 signing flags may be set in SMB2 request */
 888         if (ses->sign)
 889                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 890         else if (global_secflags & CIFSSEC_MAY_SIGN)
 891                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 892         else
 893                 req->SecurityMode = 0;
 894
 895         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 896         if (ses->chan_max > 1)
 897                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 898
 899         /* ClientGUID must be zero for SMB2.02 dialect */
 900         if (server->vals->protocol_id == SMB20_PROT_ID)
 901                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 902         else {
 903                 memcpy(req->ClientGUID, server->client_guid,
 904                         SMB2_CLIENT_GUID_SIZE);
 905                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 906                     (strcmp(server->vals->version_string,
 907                      SMB3ANY_VERSION_STRING) == 0) ||
 908                     (strcmp(server->vals->version_string,
 909                      SMBDEFAULT_VERSION_STRING) == 0))
 910                         assemble_neg_contexts(req, server, &total_len);
 911         }
 912         iov[0].iov_base = (char *)req;
 913         iov[0].iov_len = total_len;
 914
 915         memset(&rqst, 0, sizeof(struct smb_rqst));
 916         rqst.rq_iov = iov;
 917         rqst.rq_nvec = 1;
 918
 919         rc = cifs_send_recv(xid, ses, server,
 920                             &rqst, &resp_buftype, flags, &rsp_iov);
 921         cifs_small_buf_release(req);
 922         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 923         /*
 924          * No tcon so can't do
 925          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 926          */
 927         if (rc == -EOPNOTSUPP) {
 928                 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");
 929                 goto neg_exit;
 930         } else if (rc != 0)
 931                 goto neg_exit;
 932
 933         if (strcmp(server->vals->version_string,
 934                    SMB3ANY_VERSION_STRING) == 0) {
 935                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 936                         cifs_server_dbg(VFS,
 937                                 "SMB2 dialect returned but not requested\n");
 938                         return -EIO;
 939                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 940                         cifs_server_dbg(VFS,
 941                                 "SMB2.1 dialect returned but not requested\n");
 942                         return -EIO;
 943                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 944                         /* ops set to 3.0 by default for default so update */
 945                         server->ops = &smb311_operations;
 946                         server->vals = &smb311_values;
 947                 }
 948         } else if (strcmp(server->vals->version_string,
 949                    SMBDEFAULT_VERSION_STRING) == 0) {
 950                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 951                         cifs_server_dbg(VFS,
 952                                 "SMB2 dialect returned but not requested\n");
 953                         return -EIO;
 954                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 955                         /* ops set to 3.0 by default for default so update */
 956                         server->ops = &smb21_operations;
 957                         server->vals = &smb21_values;
 958                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 959                         server->ops = &smb311_operations;
 960                         server->vals = &smb311_values;
 961                 }
 962         } else if (le16_to_cpu(rsp->DialectRevision) !=
 963                                 server->vals->protocol_id) {
 964                 /* if requested single dialect ensure returned dialect matched */
 965                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 966                                 le16_to_cpu(rsp->DialectRevision));
 967                 return -EIO;
 968         }
 969
 970         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 971
 972         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 973                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 974         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 975                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 976         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 977                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 978         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 979                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 980         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 981                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 982         else {
 983                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 984                                 le16_to_cpu(rsp->DialectRevision));
 985                 rc = -EIO;
 986                 goto neg_exit;
 987         }
 988         server->dialect = le16_to_cpu(rsp->DialectRevision);
 989
 990         /*
 991          * Keep a copy of the hash after negprot. This hash will be
 992          * the starting hash value for all sessions made from this
 993          * server.
 994          */
 995         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 996                SMB2_PREAUTH_HASH_SIZE);
 997
 998         /* SMB2 only has an extended negflavor */
 999         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1000         /* set it to the maximum buffer size value we can send with 1 credit */
1001         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1002                                SMB2_MAX_BUFFER_SIZE);
1003         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1004         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1005         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1006         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1007                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1008                                 server->sec_mode);
1009         server->capabilities = le32_to_cpu(rsp->Capabilities);
1010         /* Internal types */
1011         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1012
1013         /*
1014          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1015          * Set the cipher type manually.
1016          */
1017         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1018                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1019
1020         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1021                                                (struct smb2_sync_hdr *)rsp);
1022         /*
1023          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1024          * for us will be
1025          *      ses->sectype = RawNTLMSSP;
1026          * but for time being this is our only auth choice so doesn't matter.
1027          * We just found a server which sets blob length to zero expecting raw.
1028          */
1029         if (blob_length == 0) {
1030                 cifs_dbg(FYI, "missing security blob on negprot\n");
1031                 server->sec_ntlmssp = true;
1032         }
1033
1034         rc = cifs_enable_signing(server, ses->sign);
1035         if (rc)
1036                 goto neg_exit;
1037         if (blob_length) {
1038                 rc = decode_negTokenInit(security_blob, blob_length, server);
1039                 if (rc == 1)
1040                         rc = 0;
1041                 else if (rc == 0)
1042                         rc = -EIO;
1043         }
1044
1045         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1046                 if (rsp->NegotiateContextCount)
1047                         rc = smb311_decode_neg_context(rsp, server,
1048                                                        rsp_iov.iov_len);
1049                 else
1050                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1051         }
1052 neg_exit:
1053         free_rsp_buf(resp_buftype, rsp);
1054         return rc;
1055 }
1056
1057 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1058 {
1059         int rc;
1060         struct validate_negotiate_info_req *pneg_inbuf;
1061         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1062         u32 rsplen;
1063         u32 inbuflen; /* max of 4 dialects */
1064         struct TCP_Server_Info *server = tcon->ses->server;
1065
1066         cifs_dbg(FYI, "validate negotiate\n");
1067
1068         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1069         if (server->dialect == SMB311_PROT_ID)
1070                 return 0;
1071
1072         /*
1073          * validation ioctl must be signed, so no point sending this if we
1074          * can not sign it (ie are not known user).  Even if signing is not
1075          * required (enabled but not negotiated), in those cases we selectively
1076          * sign just this, the first and only signed request on a connection.
1077          * Having validation of negotiate info  helps reduce attack vectors.
1078          */
1079         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1080                 return 0; /* validation requires signing */
1081
1082         if (tcon->ses->user_name == NULL) {
1083                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1084                 return 0; /* validation requires signing */
1085         }
1086
1087         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1088                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1089
1090         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1091         if (!pneg_inbuf)
1092                 return -ENOMEM;
1093
1094         pneg_inbuf->Capabilities =
1095                         cpu_to_le32(server->vals->req_capabilities);
1096         if (tcon->ses->chan_max > 1)
1097                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1098
1099         memcpy(pneg_inbuf->Guid, server->client_guid,
1100                                         SMB2_CLIENT_GUID_SIZE);
1101
1102         if (tcon->ses->sign)
1103                 pneg_inbuf->SecurityMode =
1104                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1105         else if (global_secflags & CIFSSEC_MAY_SIGN)
1106                 pneg_inbuf->SecurityMode =
1107                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1108         else
1109                 pneg_inbuf->SecurityMode = 0;
1110
1111
1112         if (strcmp(server->vals->version_string,
1113                 SMB3ANY_VERSION_STRING) == 0) {
1114                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1115                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1116                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1117                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1118                 /* SMB 2.1 not included so subtract one dialect from len */
1119                 inbuflen = sizeof(*pneg_inbuf) -
1120                                 (sizeof(pneg_inbuf->Dialects[0]));
1121         } else if (strcmp(server->vals->version_string,
1122                 SMBDEFAULT_VERSION_STRING) == 0) {
1123                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1124                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1125                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1126                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1127                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1128                 /* structure is big enough for 4 dialects */
1129                 inbuflen = sizeof(*pneg_inbuf);
1130         } else {
1131                 /* otherwise specific dialect was requested */
1132                 pneg_inbuf->Dialects[0] =
1133                         cpu_to_le16(server->vals->protocol_id);
1134                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1135                 /* structure is big enough for 3 dialects, sending only 1 */
1136                 inbuflen = sizeof(*pneg_inbuf) -
1137                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1138         }
1139
1140         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1141                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1142                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1143                 (char **)&pneg_rsp, &rsplen);
1144         if (rc == -EOPNOTSUPP) {
1145                 /*
1146                  * Old Windows versions or Netapp SMB server can return
1147                  * not supported error. Client should accept it.
1148                  */
1149                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1150                 rc = 0;
1151                 goto out_free_inbuf;
1152         } else if (rc != 0) {
1153                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1154                               rc);
1155                 rc = -EIO;
1156                 goto out_free_inbuf;
1157         }
1158
1159         rc = -EIO;
1160         if (rsplen != sizeof(*pneg_rsp)) {
1161                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1162                               rsplen);
1163
1164                 /* relax check since Mac returns max bufsize allowed on ioctl */
1165                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1166                         goto out_free_rsp;
1167         }
1168
1169         /* check validate negotiate info response matches what we got earlier */
1170         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1171                 goto vneg_out;
1172
1173         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1174                 goto vneg_out;
1175
1176         /* do not validate server guid because not saved at negprot time yet */
1177
1178         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1179               SMB2_LARGE_FILES) != server->capabilities)
1180                 goto vneg_out;
1181
1182         /* validate negotiate successful */
1183         rc = 0;
1184         cifs_dbg(FYI, "validate negotiate info successful\n");
1185         goto out_free_rsp;
1186
1187 vneg_out:
1188         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1189 out_free_rsp:
1190         kfree(pneg_rsp);
1191 out_free_inbuf:
1192         kfree(pneg_inbuf);
1193         return rc;
1194 }
1195
1196 enum securityEnum
1197 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1198 {
1199         switch (requested) {
1200         case Kerberos:
1201         case RawNTLMSSP:
1202                 return requested;
1203         case NTLMv2:
1204                 return RawNTLMSSP;
1205         case Unspecified:
1206                 if (server->sec_ntlmssp &&
1207                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1208                         return RawNTLMSSP;
1209                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1210                         (global_secflags & CIFSSEC_MAY_KRB5))
1211                         return Kerberos;
1212                 fallthrough;
1213         default:
1214                 return Unspecified;
1215         }
1216 }
1217
1218 struct SMB2_sess_data {
1219         unsigned int xid;
1220         struct cifs_ses *ses;
1221         struct nls_table *nls_cp;
1222         void (*func)(struct SMB2_sess_data *);
1223         int result;
1224         u64 previous_session;
1225
1226         /* we will send the SMB in three pieces:
1227          * a fixed length beginning part, an optional
1228          * SPNEGO blob (which can be zero length), and a
1229          * last part which will include the strings
1230          * and rest of bcc area. This allows us to avoid
1231          * a large buffer 17K allocation
1232          */
1233         int buf0_type;
1234         struct kvec iov[2];
1235 };
1236
1237 static int
1238 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1239 {
1240         int rc;
1241         struct cifs_ses *ses = sess_data->ses;
1242         struct smb2_sess_setup_req *req;
1243         struct TCP_Server_Info *server = cifs_ses_server(ses);
1244         unsigned int total_len;
1245
1246         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1247                                  (void **) &req,
1248                                  &total_len);
1249         if (rc)
1250                 return rc;
1251
1252         if (sess_data->ses->binding) {
1253                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1254                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1255                 req->PreviousSessionId = 0;
1256                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1257         } else {
1258                 /* First session, not a reauthenticate */
1259                 req->sync_hdr.SessionId = 0;
1260                 /*
1261                  * if reconnect, we need to send previous sess id
1262                  * otherwise it is 0
1263                  */
1264                 req->PreviousSessionId = sess_data->previous_session;
1265                 req->Flags = 0; /* MBZ */
1266         }
1267
1268         /* enough to enable echos and oplocks and one max size write */
1269         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1270
1271         /* only one of SMB2 signing flags may be set in SMB2 request */
1272         if (server->sign)
1273                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1274         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1275                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1276         else
1277                 req->SecurityMode = 0;
1278
1279 #ifdef CONFIG_CIFS_DFS_UPCALL
1280         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1281 #else
1282         req->Capabilities = 0;
1283 #endif /* DFS_UPCALL */
1284
1285         req->Channel = 0; /* MBZ */
1286
1287         sess_data->iov[0].iov_base = (char *)req;
1288         /* 1 for pad */
1289         sess_data->iov[0].iov_len = total_len - 1;
1290         /*
1291          * This variable will be used to clear the buffer
1292          * allocated above in case of any error in the calling function.
1293          */
1294         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1295
1296         return 0;
1297 }
1298
1299 static void
1300 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1301 {
1302         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1303         sess_data->buf0_type = CIFS_NO_BUFFER;
1304 }
1305
1306 static int
1307 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1308 {
1309         int rc;
1310         struct smb_rqst rqst;
1311         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1312         struct kvec rsp_iov = { NULL, 0 };
1313
1314         /* Testing shows that buffer offset must be at location of Buffer[0] */
1315         req->SecurityBufferOffset =
1316                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1317         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1318
1319         memset(&rqst, 0, sizeof(struct smb_rqst));
1320         rqst.rq_iov = sess_data->iov;
1321         rqst.rq_nvec = 2;
1322
1323         /* BB add code to build os and lm fields */
1324         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1325                             cifs_ses_server(sess_data->ses),
1326                             &rqst,
1327                             &sess_data->buf0_type,
1328                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1329         cifs_small_buf_release(sess_data->iov[0].iov_base);
1330         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1331
1332         return rc;
1333 }
1334
1335 static int
1336 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1337 {
1338         int rc = 0;
1339         struct cifs_ses *ses = sess_data->ses;
1340         struct TCP_Server_Info *server = cifs_ses_server(ses);
1341
1342         mutex_lock(&server->srv_mutex);
1343         if (server->ops->generate_signingkey) {
1344                 rc = server->ops->generate_signingkey(ses);
1345                 if (rc) {
1346                         cifs_dbg(FYI,
1347                                 "SMB3 session key generation failed\n");
1348                         mutex_unlock(&server->srv_mutex);
1349                         return rc;
1350                 }
1351         }
1352         if (!server->session_estab) {
1353                 server->sequence_number = 0x2;
1354                 server->session_estab = true;
1355         }
1356         mutex_unlock(&server->srv_mutex);
1357
1358         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1359         /* keep existing ses state if binding */
1360         if (!ses->binding) {
1361                 spin_lock(&GlobalMid_Lock);
1362                 ses->status = CifsGood;
1363                 ses->need_reconnect = false;
1364                 spin_unlock(&GlobalMid_Lock);
1365         }
1366
1367         return rc;
1368 }
1369
1370 #ifdef CONFIG_CIFS_UPCALL
1371 static void
1372 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1373 {
1374         int rc;
1375         struct cifs_ses *ses = sess_data->ses;
1376         struct cifs_spnego_msg *msg;
1377         struct key *spnego_key = NULL;
1378         struct smb2_sess_setup_rsp *rsp = NULL;
1379
1380         rc = SMB2_sess_alloc_buffer(sess_data);
1381         if (rc)
1382                 goto out;
1383
1384         spnego_key = cifs_get_spnego_key(ses);
1385         if (IS_ERR(spnego_key)) {
1386                 rc = PTR_ERR(spnego_key);
1387                 if (rc == -ENOKEY)
1388                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1389                 spnego_key = NULL;
1390                 goto out;
1391         }
1392
1393         msg = spnego_key->payload.data[0];
1394         /*
1395          * check version field to make sure that cifs.upcall is
1396          * sending us a response in an expected form
1397          */
1398         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1399                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1400                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1401                 rc = -EKEYREJECTED;
1402                 goto out_put_spnego_key;
1403         }
1404
1405         /* keep session key if binding */
1406         if (!ses->binding) {
1407                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1408                                                  GFP_KERNEL);
1409                 if (!ses->auth_key.response) {
1410                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1411                                  msg->sesskey_len);
1412                         rc = -ENOMEM;
1413                         goto out_put_spnego_key;
1414                 }
1415                 ses->auth_key.len = msg->sesskey_len;
1416         }
1417
1418         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1419         sess_data->iov[1].iov_len = msg->secblob_len;
1420
1421         rc = SMB2_sess_sendreceive(sess_data);
1422         if (rc)
1423                 goto out_put_spnego_key;
1424
1425         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1426         /* keep session id and flags if binding */
1427         if (!ses->binding) {
1428                 ses->Suid = rsp->sync_hdr.SessionId;
1429                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1430         }
1431
1432         rc = SMB2_sess_establish_session(sess_data);
1433 out_put_spnego_key:
1434         key_invalidate(spnego_key);
1435         key_put(spnego_key);
1436 out:
1437         sess_data->result = rc;
1438         sess_data->func = NULL;
1439         SMB2_sess_free_buffer(sess_data);
1440 }
1441 #else
1442 static void
1443 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1444 {
1445         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1446         sess_data->result = -EOPNOTSUPP;
1447         sess_data->func = NULL;
1448 }
1449 #endif
1450
1451 static void
1452 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1453
1454 static void
1455 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1456 {
1457         int rc;
1458         struct cifs_ses *ses = sess_data->ses;
1459         struct smb2_sess_setup_rsp *rsp = NULL;
1460         char *ntlmssp_blob = NULL;
1461         bool use_spnego = false; /* else use raw ntlmssp */
1462         u16 blob_length = 0;
1463
1464         /*
1465          * If memory allocation is successful, caller of this function
1466          * frees it.
1467          */
1468         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1469         if (!ses->ntlmssp) {
1470                 rc = -ENOMEM;
1471                 goto out_err;
1472         }
1473         ses->ntlmssp->sesskey_per_smbsess = true;
1474
1475         rc = SMB2_sess_alloc_buffer(sess_data);
1476         if (rc)
1477                 goto out_err;
1478
1479         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1480                                GFP_KERNEL);
1481         if (ntlmssp_blob == NULL) {
1482                 rc = -ENOMEM;
1483                 goto out;
1484         }
1485
1486         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1487         if (use_spnego) {
1488                 /* BB eventually need to add this */
1489                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1490                 rc = -EOPNOTSUPP;
1491                 goto out;
1492         } else {
1493                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1494                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1495         }
1496         sess_data->iov[1].iov_base = ntlmssp_blob;
1497         sess_data->iov[1].iov_len = blob_length;
1498
1499         rc = SMB2_sess_sendreceive(sess_data);
1500         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1501
1502         /* If true, rc here is expected and not an error */
1503         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1504                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1505                 rc = 0;
1506
1507         if (rc)
1508                 goto out;
1509
1510         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1511                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1512                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1513                         le16_to_cpu(rsp->SecurityBufferOffset));
1514                 rc = -EIO;
1515                 goto out;
1516         }
1517         rc = decode_ntlmssp_challenge(rsp->Buffer,
1518                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1519         if (rc)
1520                 goto out;
1521
1522         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1523
1524         /* keep existing ses id and flags if binding */
1525         if (!ses->binding) {
1526                 ses->Suid = rsp->sync_hdr.SessionId;
1527                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1528         }
1529
1530 out:
1531         kfree(ntlmssp_blob);
1532         SMB2_sess_free_buffer(sess_data);
1533         if (!rc) {
1534                 sess_data->result = 0;
1535                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1536                 return;
1537         }
1538 out_err:
1539         kfree(ses->ntlmssp);
1540         ses->ntlmssp = NULL;
1541         sess_data->result = rc;
1542         sess_data->func = NULL;
1543 }
1544
1545 static void
1546 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1547 {
1548         int rc;
1549         struct cifs_ses *ses = sess_data->ses;
1550         struct smb2_sess_setup_req *req;
1551         struct smb2_sess_setup_rsp *rsp = NULL;
1552         unsigned char *ntlmssp_blob = NULL;
1553         bool use_spnego = false; /* else use raw ntlmssp */
1554         u16 blob_length = 0;
1555
1556         rc = SMB2_sess_alloc_buffer(sess_data);
1557         if (rc)
1558                 goto out;
1559
1560         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1561         req->sync_hdr.SessionId = ses->Suid;
1562
1563         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1564                                         sess_data->nls_cp);
1565         if (rc) {
1566                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1567                 goto out;
1568         }
1569
1570         if (use_spnego) {
1571                 /* BB eventually need to add this */
1572                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1573                 rc = -EOPNOTSUPP;
1574                 goto out;
1575         }
1576         sess_data->iov[1].iov_base = ntlmssp_blob;
1577         sess_data->iov[1].iov_len = blob_length;
1578
1579         rc = SMB2_sess_sendreceive(sess_data);
1580         if (rc)
1581                 goto out;
1582
1583         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1584
1585         /* keep existing ses id and flags if binding */
1586         if (!ses->binding) {
1587                 ses->Suid = rsp->sync_hdr.SessionId;
1588                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1589         }
1590
1591         rc = SMB2_sess_establish_session(sess_data);
1592 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1593         if (ses->server->dialect < SMB30_PROT_ID) {
1594                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1595                 /*
1596                  * The session id is opaque in terms of endianness, so we can't
1597                  * print it as a long long. we dump it as we got it on the wire
1598                  */
1599                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1600                          &ses->Suid);
1601                 cifs_dbg(VFS, "Session Key   %*ph\n",
1602                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1603                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1604                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1605         }
1606 #endif
1607 out:
1608         kfree(ntlmssp_blob);
1609         SMB2_sess_free_buffer(sess_data);
1610         kfree(ses->ntlmssp);
1611         ses->ntlmssp = NULL;
1612         sess_data->result = rc;
1613         sess_data->func = NULL;
1614 }
1615
1616 static int
1617 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1618 {
1619         int type;
1620
1621         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1622         cifs_dbg(FYI, "sess setup type %d\n", type);
1623         if (type == Unspecified) {
1624                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1625                 return -EINVAL;
1626         }
1627
1628         switch (type) {
1629         case Kerberos:
1630                 sess_data->func = SMB2_auth_kerberos;
1631                 break;
1632         case RawNTLMSSP:
1633                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1634                 break;
1635         default:
1636                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1637                 return -EOPNOTSUPP;
1638         }
1639
1640         return 0;
1641 }
1642
1643 int
1644 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1645                 const struct nls_table *nls_cp)
1646 {
1647         int rc = 0;
1648         struct TCP_Server_Info *server = cifs_ses_server(ses);
1649         struct SMB2_sess_data *sess_data;
1650
1651         cifs_dbg(FYI, "Session Setup\n");
1652
1653         if (!server) {
1654                 WARN(1, "%s: server is NULL!\n", __func__);
1655                 return -EIO;
1656         }
1657
1658         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1659         if (!sess_data)
1660                 return -ENOMEM;
1661
1662         rc = SMB2_select_sec(ses, sess_data);
1663         if (rc)
1664                 goto out;
1665         sess_data->xid = xid;
1666         sess_data->ses = ses;
1667         sess_data->buf0_type = CIFS_NO_BUFFER;
1668         sess_data->nls_cp = (struct nls_table *) nls_cp;
1669         sess_data->previous_session = ses->Suid;
1670
1671         /*
1672          * Initialize the session hash with the server one.
1673          */
1674         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1675                SMB2_PREAUTH_HASH_SIZE);
1676
1677         while (sess_data->func)
1678                 sess_data->func(sess_data);
1679
1680         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1681                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1682         rc = sess_data->result;
1683 out:
1684         kfree(sess_data);
1685         return rc;
1686 }
1687
1688 int
1689 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1690 {
1691         struct smb_rqst rqst;
1692         struct smb2_logoff_req *req; /* response is also trivial struct */
1693         int rc = 0;
1694         struct TCP_Server_Info *server;
1695         int flags = 0;
1696         unsigned int total_len;
1697         struct kvec iov[1];
1698         struct kvec rsp_iov;
1699         int resp_buf_type;
1700
1701         cifs_dbg(FYI, "disconnect session %p\n", ses);
1702
1703         if (ses && (ses->server))
1704                 server = ses->server;
1705         else
1706                 return -EIO;
1707
1708         /* no need to send SMB logoff if uid already closed due to reconnect */
1709         if (ses->need_reconnect)
1710                 goto smb2_session_already_dead;
1711
1712         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1713                                  (void **) &req, &total_len);
1714         if (rc)
1715                 return rc;
1716
1717          /* since no tcon, smb2_init can not do this, so do here */
1718         req->sync_hdr.SessionId = ses->Suid;
1719
1720         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1721                 flags |= CIFS_TRANSFORM_REQ;
1722         else if (server->sign)
1723                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1724
1725         flags |= CIFS_NO_RSP_BUF;
1726
1727         iov[0].iov_base = (char *)req;
1728         iov[0].iov_len = total_len;
1729
1730         memset(&rqst, 0, sizeof(struct smb_rqst));
1731         rqst.rq_iov = iov;
1732         rqst.rq_nvec = 1;
1733
1734         rc = cifs_send_recv(xid, ses, ses->server,
1735                             &rqst, &resp_buf_type, flags, &rsp_iov);
1736         cifs_small_buf_release(req);
1737         /*
1738          * No tcon so can't do
1739          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1740          */
1741
1742 smb2_session_already_dead:
1743         return rc;
1744 }
1745
1746 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1747 {
1748         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1749 }
1750
1751 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1752
1753 /* These are similar values to what Windows uses */
1754 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1755 {
1756         tcon->max_chunks = 256;
1757         tcon->max_bytes_chunk = 1048576;
1758         tcon->max_bytes_copy = 16777216;
1759 }
1760
1761 int
1762 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1763           struct cifs_tcon *tcon, const struct nls_table *cp)
1764 {
1765         struct smb_rqst rqst;
1766         struct smb2_tree_connect_req *req;
1767         struct smb2_tree_connect_rsp *rsp = NULL;
1768         struct kvec iov[2];
1769         struct kvec rsp_iov = { NULL, 0 };
1770         int rc = 0;
1771         int resp_buftype;
1772         int unc_path_len;
1773         __le16 *unc_path = NULL;
1774         int flags = 0;
1775         unsigned int total_len;
1776         struct TCP_Server_Info *server;
1777
1778         /* always use master channel */
1779         server = ses->server;
1780
1781         cifs_dbg(FYI, "TCON\n");
1782
1783         if (!server || !tree)
1784                 return -EIO;
1785
1786         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1787         if (unc_path == NULL)
1788                 return -ENOMEM;
1789
1790         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1791         unc_path_len *= 2;
1792         if (unc_path_len < 2) {
1793                 kfree(unc_path);
1794                 return -EINVAL;
1795         }
1796
1797         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1798         tcon->tid = 0;
1799         atomic_set(&tcon->num_remote_opens, 0);
1800         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1801                                  (void **) &req, &total_len);
1802         if (rc) {
1803                 kfree(unc_path);
1804                 return rc;
1805         }
1806
1807         if (smb3_encryption_required(tcon))
1808                 flags |= CIFS_TRANSFORM_REQ;
1809
1810         iov[0].iov_base = (char *)req;
1811         /* 1 for pad */
1812         iov[0].iov_len = total_len - 1;
1813
1814         /* Testing shows that buffer offset must be at location of Buffer[0] */
1815         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1816                         - 1 /* pad */);
1817         req->PathLength = cpu_to_le16(unc_path_len - 2);
1818         iov[1].iov_base = unc_path;
1819         iov[1].iov_len = unc_path_len;
1820
1821         /*
1822          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1823          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1824          * (Samba servers don't always set the flag so also check if null user)
1825          */
1826         if ((server->dialect == SMB311_PROT_ID) &&
1827             !smb3_encryption_required(tcon) &&
1828             !(ses->session_flags &
1829                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1830             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1831                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1832
1833         memset(&rqst, 0, sizeof(struct smb_rqst));
1834         rqst.rq_iov = iov;
1835         rqst.rq_nvec = 2;
1836
1837         /* Need 64 for max size write so ask for more in case not there yet */
1838         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1839
1840         rc = cifs_send_recv(xid, ses, server,
1841                             &rqst, &resp_buftype, flags, &rsp_iov);
1842         cifs_small_buf_release(req);
1843         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1844         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1845         if (rc != 0) {
1846                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1847                 tcon->need_reconnect = true;
1848                 goto tcon_error_exit;
1849         }
1850
1851         switch (rsp->ShareType) {
1852         case SMB2_SHARE_TYPE_DISK:
1853                 cifs_dbg(FYI, "connection to disk share\n");
1854                 break;
1855         case SMB2_SHARE_TYPE_PIPE:
1856                 tcon->pipe = true;
1857                 cifs_dbg(FYI, "connection to pipe share\n");
1858                 break;
1859         case SMB2_SHARE_TYPE_PRINT:
1860                 tcon->print = true;
1861                 cifs_dbg(FYI, "connection to printer\n");
1862                 break;
1863         default:
1864                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1865                 rc = -EOPNOTSUPP;
1866                 goto tcon_error_exit;
1867         }
1868
1869         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1870         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1871         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1872         tcon->tidStatus = CifsGood;
1873         tcon->need_reconnect = false;
1874         tcon->tid = rsp->sync_hdr.TreeId;
1875         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1876
1877         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1878             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1879                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1880
1881         if (tcon->seal &&
1882             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1883                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1884
1885         init_copy_chunk_defaults(tcon);
1886         if (server->ops->validate_negotiate)
1887                 rc = server->ops->validate_negotiate(xid, tcon);
1888 tcon_exit:
1889
1890         free_rsp_buf(resp_buftype, rsp);
1891         kfree(unc_path);
1892         return rc;
1893
1894 tcon_error_exit:
1895         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1896                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1897         }
1898         goto tcon_exit;
1899 }
1900
1901 int
1902 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1903 {
1904         struct smb_rqst rqst;
1905         struct smb2_tree_disconnect_req *req; /* response is trivial */
1906         int rc = 0;
1907         struct cifs_ses *ses = tcon->ses;
1908         int flags = 0;
1909         unsigned int total_len;
1910         struct kvec iov[1];
1911         struct kvec rsp_iov;
1912         int resp_buf_type;
1913
1914         cifs_dbg(FYI, "Tree Disconnect\n");
1915
1916         if (!ses || !(ses->server))
1917                 return -EIO;
1918
1919         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1920                 return 0;
1921
1922         close_cached_dir_lease(&tcon->crfid);
1923
1924         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1925                                  (void **) &req,
1926                                  &total_len);
1927         if (rc)
1928                 return rc;
1929
1930         if (smb3_encryption_required(tcon))
1931                 flags |= CIFS_TRANSFORM_REQ;
1932
1933         flags |= CIFS_NO_RSP_BUF;
1934
1935         iov[0].iov_base = (char *)req;
1936         iov[0].iov_len = total_len;
1937
1938         memset(&rqst, 0, sizeof(struct smb_rqst));
1939         rqst.rq_iov = iov;
1940         rqst.rq_nvec = 1;
1941
1942         rc = cifs_send_recv(xid, ses, ses->server,
1943                             &rqst, &resp_buf_type, flags, &rsp_iov);
1944         cifs_small_buf_release(req);
1945         if (rc)
1946                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1947
1948         return rc;
1949 }
1950
1951
1952 static struct create_durable *
1953 create_durable_buf(void)
1954 {
1955         struct create_durable *buf;
1956
1957         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1958         if (!buf)
1959                 return NULL;
1960
1961         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1962                                         (struct create_durable, Data));
1963         buf->ccontext.DataLength = cpu_to_le32(16);
1964         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1965                                 (struct create_durable, Name));
1966         buf->ccontext.NameLength = cpu_to_le16(4);
1967         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1968         buf->Name[0] = 'D';
1969         buf->Name[1] = 'H';
1970         buf->Name[2] = 'n';
1971         buf->Name[3] = 'Q';
1972         return buf;
1973 }
1974
1975 static struct create_durable *
1976 create_reconnect_durable_buf(struct cifs_fid *fid)
1977 {
1978         struct create_durable *buf;
1979
1980         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1981         if (!buf)
1982                 return NULL;
1983
1984         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1985                                         (struct create_durable, Data));
1986         buf->ccontext.DataLength = cpu_to_le32(16);
1987         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1988                                 (struct create_durable, Name));
1989         buf->ccontext.NameLength = cpu_to_le16(4);
1990         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1991         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1992         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1993         buf->Name[0] = 'D';
1994         buf->Name[1] = 'H';
1995         buf->Name[2] = 'n';
1996         buf->Name[3] = 'C';
1997         return buf;
1998 }
1999
2000 static void
2001 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2002 {
2003         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2004
2005         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2006                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2007         buf->IndexNumber = pdisk_id->DiskFileId;
2008 }
2009
2010 static void
2011 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2012                  struct create_posix_rsp *posix)
2013 {
2014         int sid_len;
2015         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2016         u8 *end = beg + le32_to_cpu(cc->DataLength);
2017         u8 *sid;
2018
2019         memset(posix, 0, sizeof(*posix));
2020
2021         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2022         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2023         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2024
2025         sid = beg + 12;
2026         sid_len = posix_info_sid_size(sid, end);
2027         if (sid_len < 0) {
2028                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2029                 return;
2030         }
2031         memcpy(&posix->owner, sid, sid_len);
2032
2033         sid = sid + sid_len;
2034         sid_len = posix_info_sid_size(sid, end);
2035         if (sid_len < 0) {
2036                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2037                 return;
2038         }
2039         memcpy(&posix->group, sid, sid_len);
2040
2041         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2042                  posix->nlink, posix->mode, posix->reparse_tag);
2043 }
2044
2045 void
2046 smb2_parse_contexts(struct TCP_Server_Info *server,
2047                     struct smb2_create_rsp *rsp,
2048                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2049                     struct smb2_file_all_info *buf,
2050                     struct create_posix_rsp *posix)
2051 {
2052         char *data_offset;
2053         struct create_context *cc;
2054         unsigned int next;
2055         unsigned int remaining;
2056         char *name;
2057         static const char smb3_create_tag_posix[] = {
2058                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2059                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2060                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2061         };
2062
2063         *oplock = 0;
2064         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2065         remaining = le32_to_cpu(rsp->CreateContextsLength);
2066         cc = (struct create_context *)data_offset;
2067
2068         /* Initialize inode number to 0 in case no valid data in qfid context */
2069         if (buf)
2070                 buf->IndexNumber = 0;
2071
2072         while (remaining >= sizeof(struct create_context)) {
2073                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2074                 if (le16_to_cpu(cc->NameLength) == 4 &&
2075                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2076                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2077                                                            lease_key);
2078                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2079                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2080                         parse_query_id_ctxt(cc, buf);
2081                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2082                         if (posix &&
2083                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2084                                 parse_posix_ctxt(cc, buf, posix);
2085                 }
2086                 /* else {
2087                         cifs_dbg(FYI, "Context not matched with len %d\n",
2088                                 le16_to_cpu(cc->NameLength));
2089                         cifs_dump_mem("Cctxt name: ", name, 4);
2090                 } */
2091
2092                 next = le32_to_cpu(cc->Next);
2093                 if (!next)
2094                         break;
2095                 remaining -= next;
2096                 cc = (struct create_context *)((char *)cc + next);
2097         }
2098
2099         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2100                 *oplock = rsp->OplockLevel;
2101
2102         return;
2103 }
2104
2105 static int
2106 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2107                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2108 {
2109         struct smb2_create_req *req = iov[0].iov_base;
2110         unsigned int num = *num_iovec;
2111
2112         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2113         if (iov[num].iov_base == NULL)
2114                 return -ENOMEM;
2115         iov[num].iov_len = server->vals->create_lease_size;
2116         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2117         if (!req->CreateContextsOffset)
2118                 req->CreateContextsOffset = cpu_to_le32(
2119                                 sizeof(struct smb2_create_req) +
2120                                 iov[num - 1].iov_len);
2121         le32_add_cpu(&req->CreateContextsLength,
2122                      server->vals->create_lease_size);
2123         *num_iovec = num + 1;
2124         return 0;
2125 }
2126
2127 static struct create_durable_v2 *
2128 create_durable_v2_buf(struct cifs_open_parms *oparms)
2129 {
2130         struct cifs_fid *pfid = oparms->fid;
2131         struct create_durable_v2 *buf;
2132
2133         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2134         if (!buf)
2135                 return NULL;
2136
2137         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2138                                         (struct create_durable_v2, dcontext));
2139         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2140         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2141                                 (struct create_durable_v2, Name));
2142         buf->ccontext.NameLength = cpu_to_le16(4);
2143
2144         /*
2145          * NB: Handle timeout defaults to 0, which allows server to choose
2146          * (most servers default to 120 seconds) and most clients default to 0.
2147          * This can be overridden at mount ("handletimeout=") if the user wants
2148          * a different persistent (or resilient) handle timeout for all opens
2149          * opens on a particular SMB3 mount.
2150          */
2151         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2152         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2153         generate_random_uuid(buf->dcontext.CreateGuid);
2154         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2155
2156         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2157         buf->Name[0] = 'D';
2158         buf->Name[1] = 'H';
2159         buf->Name[2] = '2';
2160         buf->Name[3] = 'Q';
2161         return buf;
2162 }
2163
2164 static struct create_durable_handle_reconnect_v2 *
2165 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2166 {
2167         struct create_durable_handle_reconnect_v2 *buf;
2168
2169         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2170                         GFP_KERNEL);
2171         if (!buf)
2172                 return NULL;
2173
2174         buf->ccontext.DataOffset =
2175                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2176                                      dcontext));
2177         buf->ccontext.DataLength =
2178                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2179         buf->ccontext.NameOffset =
2180                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2181                             Name));
2182         buf->ccontext.NameLength = cpu_to_le16(4);
2183
2184         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2185         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2186         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2187         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2188
2189         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2190         buf->Name[0] = 'D';
2191         buf->Name[1] = 'H';
2192         buf->Name[2] = '2';
2193         buf->Name[3] = 'C';
2194         return buf;
2195 }
2196
2197 static int
2198 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2199                     struct cifs_open_parms *oparms)
2200 {
2201         struct smb2_create_req *req = iov[0].iov_base;
2202         unsigned int num = *num_iovec;
2203
2204         iov[num].iov_base = create_durable_v2_buf(oparms);
2205         if (iov[num].iov_base == NULL)
2206                 return -ENOMEM;
2207         iov[num].iov_len = sizeof(struct create_durable_v2);
2208         if (!req->CreateContextsOffset)
2209                 req->CreateContextsOffset =
2210                         cpu_to_le32(sizeof(struct smb2_create_req) +
2211                                                                 iov[1].iov_len);
2212         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2213         *num_iovec = num + 1;
2214         return 0;
2215 }
2216
2217 static int
2218 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2219                     struct cifs_open_parms *oparms)
2220 {
2221         struct smb2_create_req *req = iov[0].iov_base;
2222         unsigned int num = *num_iovec;
2223
2224         /* indicate that we don't need to relock the file */
2225         oparms->reconnect = false;
2226
2227         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2228         if (iov[num].iov_base == NULL)
2229                 return -ENOMEM;
2230         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2231         if (!req->CreateContextsOffset)
2232                 req->CreateContextsOffset =
2233                         cpu_to_le32(sizeof(struct smb2_create_req) +
2234                                                                 iov[1].iov_len);
2235         le32_add_cpu(&req->CreateContextsLength,
2236                         sizeof(struct create_durable_handle_reconnect_v2));
2237         *num_iovec = num + 1;
2238         return 0;
2239 }
2240
2241 static int
2242 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2243                     struct cifs_open_parms *oparms, bool use_persistent)
2244 {
2245         struct smb2_create_req *req = iov[0].iov_base;
2246         unsigned int num = *num_iovec;
2247
2248         if (use_persistent) {
2249                 if (oparms->reconnect)
2250                         return add_durable_reconnect_v2_context(iov, num_iovec,
2251                                                                 oparms);
2252                 else
2253                         return add_durable_v2_context(iov, num_iovec, oparms);
2254         }
2255
2256         if (oparms->reconnect) {
2257                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2258                 /* indicate that we don't need to relock the file */
2259                 oparms->reconnect = false;
2260         } else
2261                 iov[num].iov_base = create_durable_buf();
2262         if (iov[num].iov_base == NULL)
2263                 return -ENOMEM;
2264         iov[num].iov_len = sizeof(struct create_durable);
2265         if (!req->CreateContextsOffset)
2266                 req->CreateContextsOffset =
2267                         cpu_to_le32(sizeof(struct smb2_create_req) +
2268                                                                 iov[1].iov_len);
2269         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2270         *num_iovec = num + 1;
2271         return 0;
2272 }
2273
2274 /* See MS-SMB2 2.2.13.2.7 */
2275 static struct crt_twarp_ctxt *
2276 create_twarp_buf(__u64 timewarp)
2277 {
2278         struct crt_twarp_ctxt *buf;
2279
2280         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2281         if (!buf)
2282                 return NULL;
2283
2284         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2285                                         (struct crt_twarp_ctxt, Timestamp));
2286         buf->ccontext.DataLength = cpu_to_le32(8);
2287         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2288                                 (struct crt_twarp_ctxt, Name));
2289         buf->ccontext.NameLength = cpu_to_le16(4);
2290         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2291         buf->Name[0] = 'T';
2292         buf->Name[1] = 'W';
2293         buf->Name[2] = 'r';
2294         buf->Name[3] = 'p';
2295         buf->Timestamp = cpu_to_le64(timewarp);
2296         return buf;
2297 }
2298
2299 /* See MS-SMB2 2.2.13.2.7 */
2300 static int
2301 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2302 {
2303         struct smb2_create_req *req = iov[0].iov_base;
2304         unsigned int num = *num_iovec;
2305
2306         iov[num].iov_base = create_twarp_buf(timewarp);
2307         if (iov[num].iov_base == NULL)
2308                 return -ENOMEM;
2309         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2310         if (!req->CreateContextsOffset)
2311                 req->CreateContextsOffset = cpu_to_le32(
2312                                 sizeof(struct smb2_create_req) +
2313                                 iov[num - 1].iov_len);
2314         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2315         *num_iovec = num + 1;
2316         return 0;
2317 }
2318
2319 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2320 static void setup_owner_group_sids(char *buf)
2321 {
2322         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2323
2324         /* Populate the user ownership fields S-1-5-88-1 */
2325         sids->owner.Revision = 1;
2326         sids->owner.NumAuth = 3;
2327         sids->owner.Authority[5] = 5;
2328         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2329         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2330         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2331
2332         /* Populate the group ownership fields S-1-5-88-2 */
2333         sids->group.Revision = 1;
2334         sids->group.NumAuth = 3;
2335         sids->group.Authority[5] = 5;
2336         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2337         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2338         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2339
2340         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2341 }
2342
2343 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2344 static struct crt_sd_ctxt *
2345 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2346 {
2347         struct crt_sd_ctxt *buf;
2348         __u8 *ptr, *aclptr;
2349         unsigned int acelen, acl_size, ace_count;
2350         unsigned int owner_offset = 0;
2351         unsigned int group_offset = 0;
2352         struct smb3_acl acl;
2353
2354         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2355
2356         if (set_owner) {
2357                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2358                 *len += sizeof(struct owner_group_sids);
2359         }
2360
2361         buf = kzalloc(*len, GFP_KERNEL);
2362         if (buf == NULL)
2363                 return buf;
2364
2365         ptr = (__u8 *)&buf[1];
2366         if (set_owner) {
2367                 /* offset fields are from beginning of security descriptor not of create context */
2368                 owner_offset = ptr - (__u8 *)&buf->sd;
2369                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2370                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2371                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2372
2373                 setup_owner_group_sids(ptr);
2374                 ptr += sizeof(struct owner_group_sids);
2375         } else {
2376                 buf->sd.OffsetOwner = 0;
2377                 buf->sd.OffsetGroup = 0;
2378         }
2379
2380         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2381         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2382         buf->ccontext.NameLength = cpu_to_le16(4);
2383         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2384         buf->Name[0] = 'S';
2385         buf->Name[1] = 'e';
2386         buf->Name[2] = 'c';
2387         buf->Name[3] = 'D';
2388         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2389
2390         /*
2391          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2392          * and "DP" ie the DACL is present
2393          */
2394         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2395
2396         /* offset owner, group and Sbz1 and SACL are all zero */
2397         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2398         /* Ship the ACL for now. we will copy it into buf later. */
2399         aclptr = ptr;
2400         ptr += sizeof(struct smb3_acl);
2401
2402         /* create one ACE to hold the mode embedded in reserved special SID */
2403         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2404         ptr += acelen;
2405         acl_size = acelen + sizeof(struct smb3_acl);
2406         ace_count = 1;
2407
2408         if (set_owner) {
2409                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2410                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2411                 ptr += acelen;
2412                 acl_size += acelen;
2413                 ace_count += 1;
2414         }
2415
2416         /* and one more ACE to allow access for authenticated users */
2417         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2418         ptr += acelen;
2419         acl_size += acelen;
2420         ace_count += 1;
2421
2422         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2423         acl.AclSize = cpu_to_le16(acl_size);
2424         acl.AceCount = cpu_to_le16(ace_count);
2425         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2426
2427         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2428         *len = roundup(ptr - (__u8 *)buf, 8);
2429
2430         return buf;
2431 }
2432
2433 static int
2434 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2435 {
2436         struct smb2_create_req *req = iov[0].iov_base;
2437         unsigned int num = *num_iovec;
2438         unsigned int len = 0;
2439
2440         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2441         if (iov[num].iov_base == NULL)
2442                 return -ENOMEM;
2443         iov[num].iov_len = len;
2444         if (!req->CreateContextsOffset)
2445                 req->CreateContextsOffset = cpu_to_le32(
2446                                 sizeof(struct smb2_create_req) +
2447                                 iov[num - 1].iov_len);
2448         le32_add_cpu(&req->CreateContextsLength, len);
2449         *num_iovec = num + 1;
2450         return 0;
2451 }
2452
2453 static struct crt_query_id_ctxt *
2454 create_query_id_buf(void)
2455 {
2456         struct crt_query_id_ctxt *buf;
2457
2458         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2459         if (!buf)
2460                 return NULL;
2461
2462         buf->ccontext.DataOffset = cpu_to_le16(0);
2463         buf->ccontext.DataLength = cpu_to_le32(0);
2464         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2465                                 (struct crt_query_id_ctxt, Name));
2466         buf->ccontext.NameLength = cpu_to_le16(4);
2467         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2468         buf->Name[0] = 'Q';
2469         buf->Name[1] = 'F';
2470         buf->Name[2] = 'i';
2471         buf->Name[3] = 'd';
2472         return buf;
2473 }
2474
2475 /* See MS-SMB2 2.2.13.2.9 */
2476 static int
2477 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2478 {
2479         struct smb2_create_req *req = iov[0].iov_base;
2480         unsigned int num = *num_iovec;
2481
2482         iov[num].iov_base = create_query_id_buf();
2483         if (iov[num].iov_base == NULL)
2484                 return -ENOMEM;
2485         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2486         if (!req->CreateContextsOffset)
2487                 req->CreateContextsOffset = cpu_to_le32(
2488                                 sizeof(struct smb2_create_req) +
2489                                 iov[num - 1].iov_len);
2490         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2491         *num_iovec = num + 1;
2492         return 0;
2493 }
2494
2495 static int
2496 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2497                             const char *treename, const __le16 *path)
2498 {
2499         int treename_len, path_len;
2500         struct nls_table *cp;
2501         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2502
2503         /*
2504          * skip leading "\\"
2505          */
2506         treename_len = strlen(treename);
2507         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2508                 return -EINVAL;
2509
2510         treename += 2;
2511         treename_len -= 2;
2512
2513         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2514
2515         /*
2516          * make room for one path separator between the treename and
2517          * path
2518          */
2519         *out_len = treename_len + 1 + path_len;
2520
2521         /*
2522          * final path needs to be null-terminated UTF16 with a
2523          * size aligned to 8
2524          */
2525
2526         *out_size = roundup((*out_len+1)*2, 8);
2527         *out_path = kzalloc(*out_size, GFP_KERNEL);
2528         if (!*out_path)
2529                 return -ENOMEM;
2530
2531         cp = load_nls_default();
2532         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2533         UniStrcat(*out_path, sep);
2534         UniStrcat(*out_path, path);
2535         unload_nls(cp);
2536
2537         return 0;
2538 }
2539
2540 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2541                                umode_t mode, struct cifs_tcon *tcon,
2542                                const char *full_path,
2543                                struct cifs_sb_info *cifs_sb)
2544 {
2545         struct smb_rqst rqst;
2546         struct smb2_create_req *req;
2547         struct smb2_create_rsp *rsp = NULL;
2548         struct cifs_ses *ses = tcon->ses;
2549         struct kvec iov[3]; /* make sure at least one for each open context */
2550         struct kvec rsp_iov = {NULL, 0};
2551         int resp_buftype;
2552         int uni_path_len;
2553         __le16 *copy_path = NULL;
2554         int copy_size;
2555         int rc = 0;
2556         unsigned int n_iov = 2;
2557         __u32 file_attributes = 0;
2558         char *pc_buf = NULL;
2559         int flags = 0;
2560         unsigned int total_len;
2561         __le16 *utf16_path = NULL;
2562         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2563
2564         cifs_dbg(FYI, "mkdir\n");
2565
2566         /* resource #1: path allocation */
2567         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2568         if (!utf16_path)
2569                 return -ENOMEM;
2570
2571         if (!ses || !server) {
2572                 rc = -EIO;
2573                 goto err_free_path;
2574         }
2575
2576         /* resource #2: request */
2577         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2578                                  (void **) &req, &total_len);
2579         if (rc)
2580                 goto err_free_path;
2581
2582
2583         if (smb3_encryption_required(tcon))
2584                 flags |= CIFS_TRANSFORM_REQ;
2585
2586         req->ImpersonationLevel = IL_IMPERSONATION;
2587         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2588         /* File attributes ignored on open (used in create though) */
2589         req->FileAttributes = cpu_to_le32(file_attributes);
2590         req->ShareAccess = FILE_SHARE_ALL_LE;
2591         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2592         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2593
2594         iov[0].iov_base = (char *)req;
2595         /* -1 since last byte is buf[0] which is sent below (path) */
2596         iov[0].iov_len = total_len - 1;
2597
2598         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2599
2600         /* [MS-SMB2] 2.2.13 NameOffset:
2601          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2602          * the SMB2 header, the file name includes a prefix that will
2603          * be processed during DFS name normalization as specified in
2604          * section 3.3.5.9. Otherwise, the file name is relative to
2605          * the share that is identified by the TreeId in the SMB2
2606          * header.
2607          */
2608         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2609                 int name_len;
2610
2611                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2612                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2613                                                  &name_len,
2614                                                  tcon->treeName, utf16_path);
2615                 if (rc)
2616                         goto err_free_req;
2617
2618                 req->NameLength = cpu_to_le16(name_len * 2);
2619                 uni_path_len = copy_size;
2620                 /* free before overwriting resource */
2621                 kfree(utf16_path);
2622                 utf16_path = copy_path;
2623         } else {
2624                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2625                 /* MUST set path len (NameLength) to 0 opening root of share */
2626                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2627                 if (uni_path_len % 8 != 0) {
2628                         copy_size = roundup(uni_path_len, 8);
2629                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2630                         if (!copy_path) {
2631                                 rc = -ENOMEM;
2632                                 goto err_free_req;
2633                         }
2634                         memcpy((char *)copy_path, (const char *)utf16_path,
2635                                uni_path_len);
2636                         uni_path_len = copy_size;
2637                         /* free before overwriting resource */
2638                         kfree(utf16_path);
2639                         utf16_path = copy_path;
2640                 }
2641         }
2642
2643         iov[1].iov_len = uni_path_len;
2644         iov[1].iov_base = utf16_path;
2645         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2646
2647         if (tcon->posix_extensions) {
2648                 /* resource #3: posix buf */
2649                 rc = add_posix_context(iov, &n_iov, mode);
2650                 if (rc)
2651                         goto err_free_req;
2652                 pc_buf = iov[n_iov-1].iov_base;
2653         }
2654
2655
2656         memset(&rqst, 0, sizeof(struct smb_rqst));
2657         rqst.rq_iov = iov;
2658         rqst.rq_nvec = n_iov;
2659
2660         /* no need to inc num_remote_opens because we close it just below */
2661         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2662                                     FILE_WRITE_ATTRIBUTES);
2663         /* resource #4: response buffer */
2664         rc = cifs_send_recv(xid, ses, server,
2665                             &rqst, &resp_buftype, flags, &rsp_iov);
2666         if (rc) {
2667                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2668                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2669                                            CREATE_NOT_FILE,
2670                                            FILE_WRITE_ATTRIBUTES, rc);
2671                 goto err_free_rsp_buf;
2672         }
2673
2674         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2675         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2676                                     ses->Suid, CREATE_NOT_FILE,
2677                                     FILE_WRITE_ATTRIBUTES);
2678
2679         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2680
2681         /* Eventually save off posix specific response info and timestaps */
2682
2683 err_free_rsp_buf:
2684         free_rsp_buf(resp_buftype, rsp);
2685         kfree(pc_buf);
2686 err_free_req:
2687         cifs_small_buf_release(req);
2688 err_free_path:
2689         kfree(utf16_path);
2690         return rc;
2691 }
2692
2693 int
2694 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2695                struct smb_rqst *rqst, __u8 *oplock,
2696                struct cifs_open_parms *oparms, __le16 *path)
2697 {
2698         struct smb2_create_req *req;
2699         unsigned int n_iov = 2;
2700         __u32 file_attributes = 0;
2701         int copy_size;
2702         int uni_path_len;
2703         unsigned int total_len;
2704         struct kvec *iov = rqst->rq_iov;
2705         __le16 *copy_path;
2706         int rc;
2707
2708         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2709                                  (void **) &req, &total_len);
2710         if (rc)
2711                 return rc;
2712
2713         iov[0].iov_base = (char *)req;
2714         /* -1 since last byte is buf[0] which is sent below (path) */
2715         iov[0].iov_len = total_len - 1;
2716
2717         if (oparms->create_options & CREATE_OPTION_READONLY)
2718                 file_attributes |= ATTR_READONLY;
2719         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2720                 file_attributes |= ATTR_SYSTEM;
2721
2722         req->ImpersonationLevel = IL_IMPERSONATION;
2723         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2724         /* File attributes ignored on open (used in create though) */
2725         req->FileAttributes = cpu_to_le32(file_attributes);
2726         req->ShareAccess = FILE_SHARE_ALL_LE;
2727
2728         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2729         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2730         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2731
2732         /* [MS-SMB2] 2.2.13 NameOffset:
2733          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2734          * the SMB2 header, the file name includes a prefix that will
2735          * be processed during DFS name normalization as specified in
2736          * section 3.3.5.9. Otherwise, the file name is relative to
2737          * the share that is identified by the TreeId in the SMB2
2738          * header.
2739          */
2740         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2741                 int name_len;
2742
2743                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2744                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2745                                                  &name_len,
2746                                                  tcon->treeName, path);
2747                 if (rc)
2748                         return rc;
2749                 req->NameLength = cpu_to_le16(name_len * 2);
2750                 uni_path_len = copy_size;
2751                 path = copy_path;
2752         } else {
2753                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2754                 /* MUST set path len (NameLength) to 0 opening root of share */
2755                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2756                 copy_size = uni_path_len;
2757                 if (copy_size % 8 != 0)
2758                         copy_size = roundup(copy_size, 8);
2759                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2760                 if (!copy_path)
2761                         return -ENOMEM;
2762                 memcpy((char *)copy_path, (const char *)path,
2763                        uni_path_len);
2764                 uni_path_len = copy_size;
2765                 path = copy_path;
2766         }
2767
2768         iov[1].iov_len = uni_path_len;
2769         iov[1].iov_base = path;
2770
2771         if ((!server->oplocks) || (tcon->no_lease))
2772                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2773
2774         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2775             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2776                 req->RequestedOplockLevel = *oplock;
2777         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2778                   (oparms->create_options & CREATE_NOT_FILE))
2779                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2780         else {
2781                 rc = add_lease_context(server, iov, &n_iov,
2782                                        oparms->fid->lease_key, oplock);
2783                 if (rc)
2784                         return rc;
2785         }
2786
2787         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2788                 /* need to set Next field of lease context if we request it */
2789                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2790                         struct create_context *ccontext =
2791                             (struct create_context *)iov[n_iov-1].iov_base;
2792                         ccontext->Next =
2793                                 cpu_to_le32(server->vals->create_lease_size);
2794                 }
2795
2796                 rc = add_durable_context(iov, &n_iov, oparms,
2797                                         tcon->use_persistent);
2798                 if (rc)
2799                         return rc;
2800         }
2801
2802         if (tcon->posix_extensions) {
2803                 if (n_iov > 2) {
2804                         struct create_context *ccontext =
2805                             (struct create_context *)iov[n_iov-1].iov_base;
2806                         ccontext->Next =
2807                                 cpu_to_le32(iov[n_iov-1].iov_len);
2808                 }
2809
2810                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2811                 if (rc)
2812                         return rc;
2813         }
2814
2815         if (tcon->snapshot_time) {
2816                 cifs_dbg(FYI, "adding snapshot context\n");
2817                 if (n_iov > 2) {
2818                         struct create_context *ccontext =
2819                             (struct create_context *)iov[n_iov-1].iov_base;
2820                         ccontext->Next =
2821                                 cpu_to_le32(iov[n_iov-1].iov_len);
2822                 }
2823
2824                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2825                 if (rc)
2826                         return rc;
2827         }
2828
2829         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2830                 bool set_mode;
2831                 bool set_owner;
2832
2833                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2834                     (oparms->mode != ACL_NO_MODE))
2835                         set_mode = true;
2836                 else {
2837                         set_mode = false;
2838                         oparms->mode = ACL_NO_MODE;
2839                 }
2840
2841                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2842                         set_owner = true;
2843                 else
2844                         set_owner = false;
2845
2846                 if (set_owner | set_mode) {
2847                         if (n_iov > 2) {
2848                                 struct create_context *ccontext =
2849                                     (struct create_context *)iov[n_iov-1].iov_base;
2850                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2851                         }
2852
2853                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2854                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2855                         if (rc)
2856                                 return rc;
2857                 }
2858         }
2859
2860         if (n_iov > 2) {
2861                 struct create_context *ccontext =
2862                         (struct create_context *)iov[n_iov-1].iov_base;
2863                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2864         }
2865         add_query_id_context(iov, &n_iov);
2866
2867         rqst->rq_nvec = n_iov;
2868         return 0;
2869 }
2870
2871 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2872  * All other vectors are freed by kfree().
2873  */
2874 void
2875 SMB2_open_free(struct smb_rqst *rqst)
2876 {
2877         int i;
2878
2879         if (rqst && rqst->rq_iov) {
2880                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2881                 for (i = 1; i < rqst->rq_nvec; i++)
2882                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2883                                 kfree(rqst->rq_iov[i].iov_base);
2884         }
2885 }
2886
2887 int
2888 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2889           __u8 *oplock, struct smb2_file_all_info *buf,
2890           struct create_posix_rsp *posix,
2891           struct kvec *err_iov, int *buftype)
2892 {
2893         struct smb_rqst rqst;
2894         struct smb2_create_rsp *rsp = NULL;
2895         struct cifs_tcon *tcon = oparms->tcon;
2896         struct cifs_ses *ses = tcon->ses;
2897         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2898         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2899         struct kvec rsp_iov = {NULL, 0};
2900         int resp_buftype = CIFS_NO_BUFFER;
2901         int rc = 0;
2902         int flags = 0;
2903
2904         cifs_dbg(FYI, "create/open\n");
2905         if (!ses || !server)
2906                 return -EIO;
2907
2908         if (smb3_encryption_required(tcon))
2909                 flags |= CIFS_TRANSFORM_REQ;
2910
2911         memset(&rqst, 0, sizeof(struct smb_rqst));
2912         memset(&iov, 0, sizeof(iov));
2913         rqst.rq_iov = iov;
2914         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2915
2916         rc = SMB2_open_init(tcon, server,
2917                             &rqst, oplock, oparms, path);
2918         if (rc)
2919                 goto creat_exit;
2920
2921         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2922                 oparms->create_options, oparms->desired_access);
2923
2924         rc = cifs_send_recv(xid, ses, server,
2925                             &rqst, &resp_buftype, flags,
2926                             &rsp_iov);
2927         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2928
2929         if (rc != 0) {
2930                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2931                 if (err_iov && rsp) {
2932                         *err_iov = rsp_iov;
2933                         *buftype = resp_buftype;
2934                         resp_buftype = CIFS_NO_BUFFER;
2935                         rsp = NULL;
2936                 }
2937                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2938                                     oparms->create_options, oparms->desired_access, rc);
2939                 if (rc == -EREMCHG) {
2940                         pr_warn_once("server share %s deleted\n",
2941                                      tcon->treeName);
2942                         tcon->need_reconnect = true;
2943                 }
2944                 goto creat_exit;
2945         } else
2946                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2947                                      ses->Suid, oparms->create_options,
2948                                      oparms->desired_access);
2949
2950         atomic_inc(&tcon->num_remote_opens);
2951         oparms->fid->persistent_fid = rsp->PersistentFileId;
2952         oparms->fid->volatile_fid = rsp->VolatileFileId;
2953         oparms->fid->access = oparms->desired_access;
2954 #ifdef CONFIG_CIFS_DEBUG2
2955         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2956 #endif /* CIFS_DEBUG2 */
2957
2958         if (buf) {
2959                 buf->CreationTime = rsp->CreationTime;
2960                 buf->LastAccessTime = rsp->LastAccessTime;
2961                 buf->LastWriteTime = rsp->LastWriteTime;
2962                 buf->ChangeTime = rsp->ChangeTime;
2963                 buf->AllocationSize = rsp->AllocationSize;
2964                 buf->EndOfFile = rsp->EndofFile;
2965                 buf->Attributes = rsp->FileAttributes;
2966                 buf->NumberOfLinks = cpu_to_le32(1);
2967                 buf->DeletePending = 0;
2968         }
2969
2970
2971         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2972                             oparms->fid->lease_key, oplock, buf, posix);
2973 creat_exit:
2974         SMB2_open_free(&rqst);
2975         free_rsp_buf(resp_buftype, rsp);
2976         return rc;
2977 }
2978
2979 int
2980 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2981                 struct smb_rqst *rqst,
2982                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2983                 bool is_fsctl, char *in_data, u32 indatalen,
2984                 __u32 max_response_size)
2985 {
2986         struct smb2_ioctl_req *req;
2987         struct kvec *iov = rqst->rq_iov;
2988         unsigned int total_len;
2989         int rc;
2990         char *in_data_buf;
2991
2992         rc = smb2_ioctl_req_init(opcode, tcon, server,
2993                                  (void **) &req, &total_len);
2994         if (rc)
2995                 return rc;
2996
2997         if (indatalen) {
2998                 /*
2999                  * indatalen is usually small at a couple of bytes max, so
3000                  * just allocate through generic pool
3001                  */
3002                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3003                 if (!in_data_buf) {
3004                         cifs_small_buf_release(req);
3005                         return -ENOMEM;
3006                 }
3007         }
3008
3009         req->CtlCode = cpu_to_le32(opcode);
3010         req->PersistentFileId = persistent_fid;
3011         req->VolatileFileId = volatile_fid;
3012
3013         iov[0].iov_base = (char *)req;
3014         /*
3015          * If no input data, the size of ioctl struct in
3016          * protocol spec still includes a 1 byte data buffer,
3017          * but if input data passed to ioctl, we do not
3018          * want to double count this, so we do not send
3019          * the dummy one byte of data in iovec[0] if sending
3020          * input data (in iovec[1]).
3021          */
3022         if (indatalen) {
3023                 req->InputCount = cpu_to_le32(indatalen);
3024                 /* do not set InputOffset if no input data */
3025                 req->InputOffset =
3026                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3027                 rqst->rq_nvec = 2;
3028                 iov[0].iov_len = total_len - 1;
3029                 iov[1].iov_base = in_data_buf;
3030                 iov[1].iov_len = indatalen;
3031         } else {
3032                 rqst->rq_nvec = 1;
3033                 iov[0].iov_len = total_len;
3034         }
3035
3036         req->OutputOffset = 0;
3037         req->OutputCount = 0; /* MBZ */
3038
3039         /*
3040          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3041          * We Could increase default MaxOutputResponse, but that could require
3042          * more credits. Windows typically sets this smaller, but for some
3043          * ioctls it may be useful to allow server to send more. No point
3044          * limiting what the server can send as long as fits in one credit
3045          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3046          * to increase this limit up in the future.
3047          * Note that for snapshot queries that servers like Azure expect that
3048          * the first query be minimal size (and just used to get the number/size
3049          * of previous versions) so response size must be specified as EXACTLY
3050          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3051          * of eight bytes.  Currently that is the only case where we set max
3052          * response size smaller.
3053          */
3054         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3055         req->sync_hdr.CreditCharge =
3056                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3057                                          SMB2_MAX_BUFFER_SIZE));
3058         if (is_fsctl)
3059                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3060         else
3061                 req->Flags = 0;
3062
3063         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3064         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3065                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3066
3067         return 0;
3068 }
3069
3070 void
3071 SMB2_ioctl_free(struct smb_rqst *rqst)
3072 {
3073         int i;
3074         if (rqst && rqst->rq_iov) {
3075                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3076                 for (i = 1; i < rqst->rq_nvec; i++)
3077                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3078                                 kfree(rqst->rq_iov[i].iov_base);
3079         }
3080 }
3081
3082
3083 /*
3084  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3085  */
3086 int
3087 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3088            u64 volatile_fid, u32 opcode, bool is_fsctl,
3089            char *in_data, u32 indatalen, u32 max_out_data_len,
3090            char **out_data, u32 *plen /* returned data len */)
3091 {
3092         struct smb_rqst rqst;
3093         struct smb2_ioctl_rsp *rsp = NULL;
3094         struct cifs_ses *ses;
3095         struct TCP_Server_Info *server;
3096         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3097         struct kvec rsp_iov = {NULL, 0};
3098         int resp_buftype = CIFS_NO_BUFFER;
3099         int rc = 0;
3100         int flags = 0;
3101
3102         cifs_dbg(FYI, "SMB2 IOCTL\n");
3103
3104         if (out_data != NULL)
3105                 *out_data = NULL;
3106
3107         /* zero out returned data len, in case of error */
3108         if (plen)
3109                 *plen = 0;
3110
3111         if (!tcon)
3112                 return -EIO;
3113
3114         ses = tcon->ses;
3115         if (!ses)
3116                 return -EIO;
3117
3118         server = cifs_pick_channel(ses);
3119         if (!server)
3120                 return -EIO;
3121
3122         if (smb3_encryption_required(tcon))
3123                 flags |= CIFS_TRANSFORM_REQ;
3124
3125         memset(&rqst, 0, sizeof(struct smb_rqst));
3126         memset(&iov, 0, sizeof(iov));
3127         rqst.rq_iov = iov;
3128         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3129
3130         rc = SMB2_ioctl_init(tcon, server,
3131                              &rqst, persistent_fid, volatile_fid, opcode,
3132                              is_fsctl, in_data, indatalen, max_out_data_len);
3133         if (rc)
3134                 goto ioctl_exit;
3135
3136         rc = cifs_send_recv(xid, ses, server,
3137                             &rqst, &resp_buftype, flags,
3138                             &rsp_iov);
3139         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3140
3141         if (rc != 0)
3142                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3143                                 ses->Suid, 0, opcode, rc);
3144
3145         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3146                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3147                 goto ioctl_exit;
3148         } else if (rc == -EINVAL) {
3149                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3150                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3151                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3152                         goto ioctl_exit;
3153                 }
3154         } else if (rc == -E2BIG) {
3155                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3156                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3157                         goto ioctl_exit;
3158                 }
3159         }
3160
3161         /* check if caller wants to look at return data or just return rc */
3162         if ((plen == NULL) || (out_data == NULL))
3163                 goto ioctl_exit;
3164
3165         *plen = le32_to_cpu(rsp->OutputCount);
3166
3167         /* We check for obvious errors in the output buffer length and offset */
3168         if (*plen == 0)
3169                 goto ioctl_exit; /* server returned no data */
3170         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3171                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3172                 *plen = 0;
3173                 rc = -EIO;
3174                 goto ioctl_exit;
3175         }
3176
3177         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3178                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3179                         le32_to_cpu(rsp->OutputOffset));
3180                 *plen = 0;
3181                 rc = -EIO;
3182                 goto ioctl_exit;
3183         }
3184
3185         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3186                             *plen, GFP_KERNEL);
3187         if (*out_data == NULL) {
3188                 rc = -ENOMEM;
3189                 goto ioctl_exit;
3190         }
3191
3192 ioctl_exit:
3193         SMB2_ioctl_free(&rqst);
3194         free_rsp_buf(resp_buftype, rsp);
3195         return rc;
3196 }
3197
3198 /*
3199  *   Individual callers to ioctl worker function follow
3200  */
3201
3202 int
3203 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3204                      u64 persistent_fid, u64 volatile_fid)
3205 {
3206         int rc;
3207         struct  compress_ioctl fsctl_input;
3208         char *ret_data = NULL;
3209
3210         fsctl_input.CompressionState =
3211                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3212
3213         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3214                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3215                         (char *)&fsctl_input /* data input */,
3216                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3217                         &ret_data /* out data */, NULL);
3218
3219         cifs_dbg(FYI, "set compression rc %d\n", rc);
3220
3221         return rc;
3222 }
3223
3224 int
3225 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3226                 struct smb_rqst *rqst,
3227                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3228 {
3229         struct smb2_close_req *req;
3230         struct kvec *iov = rqst->rq_iov;
3231         unsigned int total_len;
3232         int rc;
3233
3234         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3235                                  (void **) &req, &total_len);
3236         if (rc)
3237                 return rc;
3238
3239         req->PersistentFileId = persistent_fid;
3240         req->VolatileFileId = volatile_fid;
3241         if (query_attrs)
3242                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3243         else
3244                 req->Flags = 0;
3245         iov[0].iov_base = (char *)req;
3246         iov[0].iov_len = total_len;
3247
3248         return 0;
3249 }
3250
3251 void
3252 SMB2_close_free(struct smb_rqst *rqst)
3253 {
3254         if (rqst && rqst->rq_iov)
3255                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3256 }
3257
3258 int
3259 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3260              u64 persistent_fid, u64 volatile_fid,
3261              struct smb2_file_network_open_info *pbuf)
3262 {
3263         struct smb_rqst rqst;
3264         struct smb2_close_rsp *rsp = NULL;
3265         struct cifs_ses *ses = tcon->ses;
3266         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3267         struct kvec iov[1];
3268         struct kvec rsp_iov;
3269         int resp_buftype = CIFS_NO_BUFFER;
3270         int rc = 0;
3271         int flags = 0;
3272         bool query_attrs = false;
3273
3274         cifs_dbg(FYI, "Close\n");
3275
3276         if (!ses || !server)
3277                 return -EIO;
3278
3279         if (smb3_encryption_required(tcon))
3280                 flags |= CIFS_TRANSFORM_REQ;
3281
3282         memset(&rqst, 0, sizeof(struct smb_rqst));
3283         memset(&iov, 0, sizeof(iov));
3284         rqst.rq_iov = iov;
3285         rqst.rq_nvec = 1;
3286
3287         /* check if need to ask server to return timestamps in close response */
3288         if (pbuf)
3289                 query_attrs = true;
3290
3291         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3292         rc = SMB2_close_init(tcon, server,
3293                              &rqst, persistent_fid, volatile_fid,
3294                              query_attrs);
3295         if (rc)
3296                 goto close_exit;
3297
3298         rc = cifs_send_recv(xid, ses, server,
3299                             &rqst, &resp_buftype, flags, &rsp_iov);
3300         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3301
3302         if (rc != 0) {
3303                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3304                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3305                                      rc);
3306                 goto close_exit;
3307         } else {
3308                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3309                                       ses->Suid);
3310                 /*
3311                  * Note that have to subtract 4 since struct network_open_info
3312                  * has a final 4 byte pad that close response does not have
3313                  */
3314                 if (pbuf)
3315                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3316         }
3317
3318         atomic_dec(&tcon->num_remote_opens);
3319 close_exit:
3320         SMB2_close_free(&rqst);
3321         free_rsp_buf(resp_buftype, rsp);
3322
3323         /* retry close in a worker thread if this one is interrupted */
3324         if (is_interrupt_error(rc)) {
3325                 int tmp_rc;
3326
3327                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3328                                                      volatile_fid);
3329                 if (tmp_rc)
3330                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3331                                  persistent_fid, tmp_rc);
3332         }
3333         return rc;
3334 }
3335
3336 int
3337 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3338                 u64 persistent_fid, u64 volatile_fid)
3339 {
3340         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3341 }
3342
3343 int
3344 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3345                   struct kvec *iov, unsigned int min_buf_size)
3346 {
3347         unsigned int smb_len = iov->iov_len;
3348         char *end_of_smb = smb_len + (char *)iov->iov_base;
3349         char *begin_of_buf = offset + (char *)iov->iov_base;
3350         char *end_of_buf = begin_of_buf + buffer_length;
3351
3352
3353         if (buffer_length < min_buf_size) {
3354                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3355                          buffer_length, min_buf_size);
3356                 return -EINVAL;
3357         }
3358
3359         /* check if beyond RFC1001 maximum length */
3360         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3361                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3362                          buffer_length, smb_len);
3363                 return -EINVAL;
3364         }
3365
3366         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3367                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3368                 return -EINVAL;
3369         }
3370
3371         return 0;
3372 }
3373
3374 /*
3375  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3376  * Caller must free buffer.
3377  */
3378 int
3379 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3380                            struct kvec *iov, unsigned int minbufsize,
3381                            char *data)
3382 {
3383         char *begin_of_buf = offset + (char *)iov->iov_base;
3384         int rc;
3385
3386         if (!data)
3387                 return -EINVAL;
3388
3389         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3390         if (rc)
3391                 return rc;
3392
3393         memcpy(data, begin_of_buf, buffer_length);
3394
3395         return 0;
3396 }
3397
3398 int
3399 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3400                      struct smb_rqst *rqst,
3401                      u64 persistent_fid, u64 volatile_fid,
3402                      u8 info_class, u8 info_type, u32 additional_info,
3403                      size_t output_len, size_t input_len, void *input)
3404 {
3405         struct smb2_query_info_req *req;
3406         struct kvec *iov = rqst->rq_iov;
3407         unsigned int total_len;
3408         int rc;
3409
3410         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3411                                  (void **) &req, &total_len);
3412         if (rc)
3413                 return rc;
3414
3415         req->InfoType = info_type;
3416         req->FileInfoClass = info_class;
3417         req->PersistentFileId = persistent_fid;
3418         req->VolatileFileId = volatile_fid;
3419         req->AdditionalInformation = cpu_to_le32(additional_info);
3420
3421         req->OutputBufferLength = cpu_to_le32(output_len);
3422         if (input_len) {
3423                 req->InputBufferLength = cpu_to_le32(input_len);
3424                 /* total_len for smb query request never close to le16 max */
3425                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3426                 memcpy(req->Buffer, input, input_len);
3427         }
3428
3429         iov[0].iov_base = (char *)req;
3430         /* 1 for Buffer */
3431         iov[0].iov_len = total_len - 1 + input_len;
3432         return 0;
3433 }
3434
3435 void
3436 SMB2_query_info_free(struct smb_rqst *rqst)
3437 {
3438         if (rqst && rqst->rq_iov)
3439                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3440 }
3441
3442 static int
3443 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3444            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3445            u32 additional_info, size_t output_len, size_t min_len, void **data,
3446                 u32 *dlen)
3447 {
3448         struct smb_rqst rqst;
3449         struct smb2_query_info_rsp *rsp = NULL;
3450         struct kvec iov[1];
3451         struct kvec rsp_iov;
3452         int rc = 0;
3453         int resp_buftype = CIFS_NO_BUFFER;
3454         struct cifs_ses *ses = tcon->ses;
3455         struct TCP_Server_Info *server;
3456         int flags = 0;
3457         bool allocated = false;
3458
3459         cifs_dbg(FYI, "Query Info\n");
3460
3461         if (!ses)
3462                 return -EIO;
3463         server = cifs_pick_channel(ses);
3464         if (!server)
3465                 return -EIO;
3466
3467         if (smb3_encryption_required(tcon))
3468                 flags |= CIFS_TRANSFORM_REQ;
3469
3470         memset(&rqst, 0, sizeof(struct smb_rqst));
3471         memset(&iov, 0, sizeof(iov));
3472         rqst.rq_iov = iov;
3473         rqst.rq_nvec = 1;
3474
3475         rc = SMB2_query_info_init(tcon, server,
3476                                   &rqst, persistent_fid, volatile_fid,
3477                                   info_class, info_type, additional_info,
3478                                   output_len, 0, NULL);
3479         if (rc)
3480                 goto qinf_exit;
3481
3482         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3483                                     ses->Suid, info_class, (__u32)info_type);
3484
3485         rc = cifs_send_recv(xid, ses, server,
3486                             &rqst, &resp_buftype, flags, &rsp_iov);
3487         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3488
3489         if (rc) {
3490                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3491                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3492                                 ses->Suid, info_class, (__u32)info_type, rc);
3493                 goto qinf_exit;
3494         }
3495
3496         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3497                                 ses->Suid, info_class, (__u32)info_type);
3498
3499         if (dlen) {
3500                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3501                 if (!*data) {
3502                         *data = kmalloc(*dlen, GFP_KERNEL);
3503                         if (!*data) {
3504                                 cifs_tcon_dbg(VFS,
3505                                         "Error %d allocating memory for acl\n",
3506                                         rc);
3507                                 *dlen = 0;
3508                                 rc = -ENOMEM;
3509                                 goto qinf_exit;
3510                         }
3511                         allocated = true;
3512                 }
3513         }
3514
3515         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3516                                         le32_to_cpu(rsp->OutputBufferLength),
3517                                         &rsp_iov, min_len, *data);
3518         if (rc && allocated) {
3519                 kfree(*data);
3520                 *data = NULL;
3521                 *dlen = 0;
3522         }
3523
3524 qinf_exit:
3525         SMB2_query_info_free(&rqst);
3526         free_rsp_buf(resp_buftype, rsp);
3527         return rc;
3528 }
3529
3530 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3531         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3532 {
3533         return query_info(xid, tcon, persistent_fid, volatile_fid,
3534                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3535                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3536                           sizeof(struct smb2_file_all_info), (void **)&data,
3537                           NULL);
3538 }
3539
3540 #if 0
3541 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3542 int
3543 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3544                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3545 {
3546         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3547                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3548         *plen = 0;
3549
3550         return query_info(xid, tcon, persistent_fid, volatile_fid,
3551                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3552                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3553         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3554 }
3555 #endif
3556
3557 int
3558 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3559                u64 persistent_fid, u64 volatile_fid,
3560                void **data, u32 *plen, u32 extra_info)
3561 {
3562         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3563                                 extra_info;
3564         *plen = 0;
3565
3566         return query_info(xid, tcon, persistent_fid, volatile_fid,
3567                           0, SMB2_O_INFO_SECURITY, additional_info,
3568                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3569 }
3570
3571 int
3572 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3573                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3574 {
3575         return query_info(xid, tcon, persistent_fid, volatile_fid,
3576                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3577                           sizeof(struct smb2_file_internal_info),
3578                           sizeof(struct smb2_file_internal_info),
3579                           (void **)&uniqueid, NULL);
3580 }
3581
3582 /*
3583  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3584  * See MS-SMB2 2.2.35 and 2.2.36
3585  */
3586
3587 static int
3588 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3589                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3590                  u64 persistent_fid, u64 volatile_fid,
3591                  u32 completion_filter, bool watch_tree)
3592 {
3593         struct smb2_change_notify_req *req;
3594         struct kvec *iov = rqst->rq_iov;
3595         unsigned int total_len;
3596         int rc;
3597
3598         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3599                                  (void **) &req, &total_len);
3600         if (rc)
3601                 return rc;
3602
3603         req->PersistentFileId = persistent_fid;
3604         req->VolatileFileId = volatile_fid;
3605         /* See note 354 of MS-SMB2, 64K max */
3606         req->OutputBufferLength =
3607                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3608         req->CompletionFilter = cpu_to_le32(completion_filter);
3609         if (watch_tree)
3610                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3611         else
3612                 req->Flags = 0;
3613
3614         iov[0].iov_base = (char *)req;
3615         iov[0].iov_len = total_len;
3616
3617         return 0;
3618 }
3619
3620 int
3621 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3622                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3623                 u32 completion_filter)
3624 {
3625         struct cifs_ses *ses = tcon->ses;
3626         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3627         struct smb_rqst rqst;
3628         struct kvec iov[1];
3629         struct kvec rsp_iov = {NULL, 0};
3630         int resp_buftype = CIFS_NO_BUFFER;
3631         int flags = 0;
3632         int rc = 0;
3633
3634         cifs_dbg(FYI, "change notify\n");
3635         if (!ses || !server)
3636                 return -EIO;
3637
3638         if (smb3_encryption_required(tcon))
3639                 flags |= CIFS_TRANSFORM_REQ;
3640
3641         memset(&rqst, 0, sizeof(struct smb_rqst));
3642         memset(&iov, 0, sizeof(iov));
3643         rqst.rq_iov = iov;
3644         rqst.rq_nvec = 1;
3645
3646         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3647                               persistent_fid, volatile_fid,
3648                               completion_filter, watch_tree);
3649         if (rc)
3650                 goto cnotify_exit;
3651
3652         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3653                                 (u8)watch_tree, completion_filter);
3654         rc = cifs_send_recv(xid, ses, server,
3655                             &rqst, &resp_buftype, flags, &rsp_iov);
3656
3657         if (rc != 0) {
3658                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3659                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3660                                 (u8)watch_tree, completion_filter, rc);
3661         } else
3662                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3663                                 ses->Suid, (u8)watch_tree, completion_filter);
3664
3665  cnotify_exit:
3666         if (rqst.rq_iov)
3667                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3668         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3669         return rc;
3670 }
3671
3672
3673
3674 /*
3675  * This is a no-op for now. We're not really interested in the reply, but
3676  * rather in the fact that the server sent one and that server->lstrp
3677  * gets updated.
3678  *
3679  * FIXME: maybe we should consider checking that the reply matches request?
3680  */
3681 static void
3682 smb2_echo_callback(struct mid_q_entry *mid)
3683 {
3684         struct TCP_Server_Info *server = mid->callback_data;
3685         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3686         struct cifs_credits credits = { .value = 0, .instance = 0 };
3687
3688         if (mid->mid_state == MID_RESPONSE_RECEIVED
3689             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3690                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3691                 credits.instance = server->reconnect_instance;
3692         }
3693
3694         DeleteMidQEntry(mid);
3695         add_credits(server, &credits, CIFS_ECHO_OP);
3696 }
3697
3698 void smb2_reconnect_server(struct work_struct *work)
3699 {
3700         struct TCP_Server_Info *server = container_of(work,
3701                                         struct TCP_Server_Info, reconnect.work);
3702         struct cifs_ses *ses;
3703         struct cifs_tcon *tcon, *tcon2;
3704         struct list_head tmp_list;
3705         int tcon_exist = false;
3706         int rc;
3707         int resched = false;
3708
3709
3710         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3711         mutex_lock(&server->reconnect_mutex);
3712
3713         INIT_LIST_HEAD(&tmp_list);
3714         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3715
3716         spin_lock(&cifs_tcp_ses_lock);
3717         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3718                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3719                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3720                                 tcon->tc_count++;
3721                                 list_add_tail(&tcon->rlist, &tmp_list);
3722                                 tcon_exist = true;
3723                         }
3724                 }
3725                 /*
3726                  * IPC has the same lifetime as its session and uses its
3727                  * refcount.
3728                  */
3729                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3730                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3731                         tcon_exist = true;
3732                         ses->ses_count++;
3733                 }
3734         }
3735         /*
3736          * Get the reference to server struct to be sure that the last call of
3737          * cifs_put_tcon() in the loop below won't release the server pointer.
3738          */
3739         if (tcon_exist)
3740                 server->srv_count++;
3741
3742         spin_unlock(&cifs_tcp_ses_lock);
3743
3744         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3745                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3746                 if (!rc)
3747                         cifs_reopen_persistent_handles(tcon);
3748                 else
3749                         resched = true;
3750                 list_del_init(&tcon->rlist);
3751                 if (tcon->ipc)
3752                         cifs_put_smb_ses(tcon->ses);
3753                 else
3754                         cifs_put_tcon(tcon);
3755         }
3756
3757         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3758         if (resched)
3759                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3760         mutex_unlock(&server->reconnect_mutex);
3761
3762         /* now we can safely release srv struct */
3763         if (tcon_exist)
3764                 cifs_put_tcp_session(server, 1);
3765 }
3766
3767 int
3768 SMB2_echo(struct TCP_Server_Info *server)
3769 {
3770         struct smb2_echo_req *req;
3771         int rc = 0;
3772         struct kvec iov[1];
3773         struct smb_rqst rqst = { .rq_iov = iov,
3774                                  .rq_nvec = 1 };
3775         unsigned int total_len;
3776
3777         cifs_dbg(FYI, "In echo request\n");
3778
3779         if (server->tcpStatus == CifsNeedNegotiate) {
3780                 /* No need to send echo on newly established connections */
3781                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3782                 return rc;
3783         }
3784
3785         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3786                                  (void **)&req, &total_len);
3787         if (rc)
3788                 return rc;
3789
3790         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3791
3792         iov[0].iov_len = total_len;
3793         iov[0].iov_base = (char *)req;
3794
3795         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3796                              server, CIFS_ECHO_OP, NULL);
3797         if (rc)
3798                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3799
3800         cifs_small_buf_release(req);
3801         return rc;
3802 }
3803
3804 void
3805 SMB2_flush_free(struct smb_rqst *rqst)
3806 {
3807         if (rqst && rqst->rq_iov)
3808                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3809 }
3810
3811 int
3812 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3813                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3814                 u64 persistent_fid, u64 volatile_fid)
3815 {
3816         struct smb2_flush_req *req;
3817         struct kvec *iov = rqst->rq_iov;
3818         unsigned int total_len;
3819         int rc;
3820
3821         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3822                                  (void **) &req, &total_len);
3823         if (rc)
3824                 return rc;
3825
3826         req->PersistentFileId = persistent_fid;
3827         req->VolatileFileId = volatile_fid;
3828
3829         iov[0].iov_base = (char *)req;
3830         iov[0].iov_len = total_len;
3831
3832         return 0;
3833 }
3834
3835 int
3836 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3837            u64 volatile_fid)
3838 {
3839         struct cifs_ses *ses = tcon->ses;
3840         struct smb_rqst rqst;
3841         struct kvec iov[1];
3842         struct kvec rsp_iov = {NULL, 0};
3843         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3844         int resp_buftype = CIFS_NO_BUFFER;
3845         int flags = 0;
3846         int rc = 0;
3847
3848         cifs_dbg(FYI, "flush\n");
3849         if (!ses || !(ses->server))
3850                 return -EIO;
3851
3852         if (smb3_encryption_required(tcon))
3853                 flags |= CIFS_TRANSFORM_REQ;
3854
3855         memset(&rqst, 0, sizeof(struct smb_rqst));
3856         memset(&iov, 0, sizeof(iov));
3857         rqst.rq_iov = iov;
3858         rqst.rq_nvec = 1;
3859
3860         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3861                              persistent_fid, volatile_fid);
3862         if (rc)
3863                 goto flush_exit;
3864
3865         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3866         rc = cifs_send_recv(xid, ses, server,
3867                             &rqst, &resp_buftype, flags, &rsp_iov);
3868
3869         if (rc != 0) {
3870                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3871                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3872                                      rc);
3873         } else
3874                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3875                                       ses->Suid);
3876
3877  flush_exit:
3878         SMB2_flush_free(&rqst);
3879         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3880         return rc;
3881 }
3882
3883 /*
3884  * To form a chain of read requests, any read requests after the first should
3885  * have the end_of_chain boolean set to true.
3886  */
3887 static int
3888 smb2_new_read_req(void **buf, unsigned int *total_len,
3889         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3890         unsigned int remaining_bytes, int request_type)
3891 {
3892         int rc = -EACCES;
3893         struct smb2_read_plain_req *req = NULL;
3894         struct smb2_sync_hdr *shdr;
3895         struct TCP_Server_Info *server = io_parms->server;
3896
3897         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3898                                  (void **) &req, total_len);
3899         if (rc)
3900                 return rc;
3901
3902         if (server == NULL)
3903                 return -ECONNABORTED;
3904
3905         shdr = &req->sync_hdr;
3906         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3907
3908         req->PersistentFileId = io_parms->persistent_fid;
3909         req->VolatileFileId = io_parms->volatile_fid;
3910         req->ReadChannelInfoOffset = 0; /* reserved */
3911         req->ReadChannelInfoLength = 0; /* reserved */
3912         req->Channel = 0; /* reserved */
3913         req->MinimumCount = 0;
3914         req->Length = cpu_to_le32(io_parms->length);
3915         req->Offset = cpu_to_le64(io_parms->offset);
3916
3917         trace_smb3_read_enter(0 /* xid */,
3918                         io_parms->persistent_fid,
3919                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3920                         io_parms->offset, io_parms->length);
3921 #ifdef CONFIG_CIFS_SMB_DIRECT
3922         /*
3923          * If we want to do a RDMA write, fill in and append
3924          * smbd_buffer_descriptor_v1 to the end of read request
3925          */
3926         if (server->rdma && rdata && !server->sign &&
3927                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3928
3929                 struct smbd_buffer_descriptor_v1 *v1;
3930                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3931
3932                 rdata->mr = smbd_register_mr(
3933                                 server->smbd_conn, rdata->pages,
3934                                 rdata->nr_pages, rdata->page_offset,
3935                                 rdata->tailsz, true, need_invalidate);
3936                 if (!rdata->mr)
3937                         return -EAGAIN;
3938
3939                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3940                 if (need_invalidate)
3941                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3942                 req->ReadChannelInfoOffset =
3943                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3944                 req->ReadChannelInfoLength =
3945                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3946                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3947                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3948                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3949                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3950
3951                 *total_len += sizeof(*v1) - 1;
3952         }
3953 #endif
3954         if (request_type & CHAINED_REQUEST) {
3955                 if (!(request_type & END_OF_CHAIN)) {
3956                         /* next 8-byte aligned request */
3957                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3958                         shdr->NextCommand = cpu_to_le32(*total_len);
3959                 } else /* END_OF_CHAIN */
3960                         shdr->NextCommand = 0;
3961                 if (request_type & RELATED_REQUEST) {
3962                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3963                         /*
3964                          * Related requests use info from previous read request
3965                          * in chain.
3966                          */
3967                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3968                         shdr->TreeId = 0xFFFFFFFF;
3969                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3970                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3971                 }
3972         }
3973         if (remaining_bytes > io_parms->length)
3974                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3975         else
3976                 req->RemainingBytes = 0;
3977
3978         *buf = req;
3979         return rc;
3980 }
3981
3982 static void
3983 smb2_readv_callback(struct mid_q_entry *mid)
3984 {
3985         struct cifs_readdata *rdata = mid->callback_data;
3986         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3987         struct TCP_Server_Info *server = rdata->server;
3988         struct smb2_sync_hdr *shdr =
3989                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3990         struct cifs_credits credits = { .value = 0, .instance = 0 };
3991         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3992                                  .rq_nvec = 1,
3993                                  .rq_pages = rdata->pages,
3994                                  .rq_offset = rdata->page_offset,
3995                                  .rq_npages = rdata->nr_pages,
3996                                  .rq_pagesz = rdata->pagesz,
3997                                  .rq_tailsz = rdata->tailsz };
3998
3999         WARN_ONCE(rdata->server != mid->server,
4000                   "rdata server %p != mid server %p",
4001                   rdata->server, mid->server);
4002
4003         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4004                  __func__, mid->mid, mid->mid_state, rdata->result,
4005                  rdata->bytes);
4006
4007         switch (mid->mid_state) {
4008         case MID_RESPONSE_RECEIVED:
4009                 credits.value = le16_to_cpu(shdr->CreditRequest);
4010                 credits.instance = server->reconnect_instance;
4011                 /* result already set, check signature */
4012                 if (server->sign && !mid->decrypted) {
4013                         int rc;
4014
4015                         rc = smb2_verify_signature(&rqst, server);
4016                         if (rc)
4017                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4018                                          rc);
4019                 }
4020                 /* FIXME: should this be counted toward the initiating task? */
4021                 task_io_account_read(rdata->got_bytes);
4022                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4023                 break;
4024         case MID_REQUEST_SUBMITTED:
4025         case MID_RETRY_NEEDED:
4026                 rdata->result = -EAGAIN;
4027                 if (server->sign && rdata->got_bytes)
4028                         /* reset bytes number since we can not check a sign */
4029                         rdata->got_bytes = 0;
4030                 /* FIXME: should this be counted toward the initiating task? */
4031                 task_io_account_read(rdata->got_bytes);
4032                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4033                 break;
4034         case MID_RESPONSE_MALFORMED:
4035                 credits.value = le16_to_cpu(shdr->CreditRequest);
4036                 credits.instance = server->reconnect_instance;
4037                 fallthrough;
4038         default:
4039                 rdata->result = -EIO;
4040         }
4041 #ifdef CONFIG_CIFS_SMB_DIRECT
4042         /*
4043          * If this rdata has a memmory registered, the MR can be freed
4044          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4045          * because they have limited number and are used for future I/Os
4046          */
4047         if (rdata->mr) {
4048                 smbd_deregister_mr(rdata->mr);
4049                 rdata->mr = NULL;
4050         }
4051 #endif
4052         if (rdata->result && rdata->result != -ENODATA) {
4053                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4054                 trace_smb3_read_err(0 /* xid */,
4055                                     rdata->cfile->fid.persistent_fid,
4056                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4057                                     rdata->bytes, rdata->result);
4058         } else
4059                 trace_smb3_read_done(0 /* xid */,
4060                                      rdata->cfile->fid.persistent_fid,
4061                                      tcon->tid, tcon->ses->Suid,
4062                                      rdata->offset, rdata->got_bytes);
4063
4064         queue_work(cifsiod_wq, &rdata->work);
4065         DeleteMidQEntry(mid);
4066         add_credits(server, &credits, 0);
4067 }
4068
4069 /* smb2_async_readv - send an async read, and set up mid to handle result */
4070 int
4071 smb2_async_readv(struct cifs_readdata *rdata)
4072 {
4073         int rc, flags = 0;
4074         char *buf;
4075         struct smb2_sync_hdr *shdr;
4076         struct cifs_io_parms io_parms;
4077         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4078                                  .rq_nvec = 1 };
4079         struct TCP_Server_Info *server;
4080         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4081         unsigned int total_len;
4082
4083         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4084                  __func__, rdata->offset, rdata->bytes);
4085
4086         if (!rdata->server)
4087                 rdata->server = cifs_pick_channel(tcon->ses);
4088
4089         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4090         io_parms.server = server = rdata->server;
4091         io_parms.offset = rdata->offset;
4092         io_parms.length = rdata->bytes;
4093         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4094         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4095         io_parms.pid = rdata->pid;
4096
4097         rc = smb2_new_read_req(
4098                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4099         if (rc)
4100                 return rc;
4101
4102         if (smb3_encryption_required(io_parms.tcon))
4103                 flags |= CIFS_TRANSFORM_REQ;
4104
4105         rdata->iov[0].iov_base = buf;
4106         rdata->iov[0].iov_len = total_len;
4107
4108         shdr = (struct smb2_sync_hdr *)buf;
4109
4110         if (rdata->credits.value > 0) {
4111                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4112                                                 SMB2_MAX_BUFFER_SIZE));
4113                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4114
4115                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4116                 if (rc)
4117                         goto async_readv_out;
4118
4119                 flags |= CIFS_HAS_CREDITS;
4120         }
4121
4122         kref_get(&rdata->refcount);
4123         rc = cifs_call_async(server, &rqst,
4124                              cifs_readv_receive, smb2_readv_callback,
4125                              smb3_handle_read_data, rdata, flags,
4126                              &rdata->credits);
4127         if (rc) {
4128                 kref_put(&rdata->refcount, cifs_readdata_release);
4129                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4130                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4131                                     io_parms.tcon->tid,
4132                                     io_parms.tcon->ses->Suid,
4133                                     io_parms.offset, io_parms.length, rc);
4134         }
4135
4136 async_readv_out:
4137         cifs_small_buf_release(buf);
4138         return rc;
4139 }
4140
4141 int
4142 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4143           unsigned int *nbytes, char **buf, int *buf_type)
4144 {
4145         struct smb_rqst rqst;
4146         int resp_buftype, rc;
4147         struct smb2_read_plain_req *req = NULL;
4148         struct smb2_read_rsp *rsp = NULL;
4149         struct kvec iov[1];
4150         struct kvec rsp_iov;
4151         unsigned int total_len;
4152         int flags = CIFS_LOG_ERROR;
4153         struct cifs_ses *ses = io_parms->tcon->ses;
4154
4155         if (!io_parms->server)
4156                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4157
4158         *nbytes = 0;
4159         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4160         if (rc)
4161                 return rc;
4162
4163         if (smb3_encryption_required(io_parms->tcon))
4164                 flags |= CIFS_TRANSFORM_REQ;
4165
4166         iov[0].iov_base = (char *)req;
4167         iov[0].iov_len = total_len;
4168
4169         memset(&rqst, 0, sizeof(struct smb_rqst));
4170         rqst.rq_iov = iov;
4171         rqst.rq_nvec = 1;
4172
4173         rc = cifs_send_recv(xid, ses, io_parms->server,
4174                             &rqst, &resp_buftype, flags, &rsp_iov);
4175         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4176
4177         if (rc) {
4178                 if (rc != -ENODATA) {
4179                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4180                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4181                         trace_smb3_read_err(xid, req->PersistentFileId,
4182                                             io_parms->tcon->tid, ses->Suid,
4183                                             io_parms->offset, io_parms->length,
4184                                             rc);
4185                 } else
4186                         trace_smb3_read_done(xid, req->PersistentFileId,
4187                                     io_parms->tcon->tid, ses->Suid,
4188                                     io_parms->offset, 0);
4189                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4190                 cifs_small_buf_release(req);
4191                 return rc == -ENODATA ? 0 : rc;
4192         } else
4193                 trace_smb3_read_done(xid, req->PersistentFileId,
4194                                     io_parms->tcon->tid, ses->Suid,
4195                                     io_parms->offset, io_parms->length);
4196
4197         cifs_small_buf_release(req);
4198
4199         *nbytes = le32_to_cpu(rsp->DataLength);
4200         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4201             (*nbytes > io_parms->length)) {
4202                 cifs_dbg(FYI, "bad length %d for count %d\n",
4203                          *nbytes, io_parms->length);
4204                 rc = -EIO;
4205                 *nbytes = 0;
4206         }
4207
4208         if (*buf) {
4209                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4210                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4211         } else if (resp_buftype != CIFS_NO_BUFFER) {
4212                 *buf = rsp_iov.iov_base;
4213                 if (resp_buftype == CIFS_SMALL_BUFFER)
4214                         *buf_type = CIFS_SMALL_BUFFER;
4215                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4216                         *buf_type = CIFS_LARGE_BUFFER;
4217         }
4218         return rc;
4219 }
4220
4221 /*
4222  * Check the mid_state and signature on received buffer (if any), and queue the
4223  * workqueue completion task.
4224  */
4225 static void
4226 smb2_writev_callback(struct mid_q_entry *mid)
4227 {
4228         struct cifs_writedata *wdata = mid->callback_data;
4229         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4230         struct TCP_Server_Info *server = wdata->server;
4231         unsigned int written;
4232         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4233         struct cifs_credits credits = { .value = 0, .instance = 0 };
4234
4235         WARN_ONCE(wdata->server != mid->server,
4236                   "wdata server %p != mid server %p",
4237                   wdata->server, mid->server);
4238
4239         switch (mid->mid_state) {
4240         case MID_RESPONSE_RECEIVED:
4241                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4242                 credits.instance = server->reconnect_instance;
4243                 wdata->result = smb2_check_receive(mid, server, 0);
4244                 if (wdata->result != 0)
4245                         break;
4246
4247                 written = le32_to_cpu(rsp->DataLength);
4248                 /*
4249                  * Mask off high 16 bits when bytes written as returned
4250                  * by the server is greater than bytes requested by the
4251                  * client. OS/2 servers are known to set incorrect
4252                  * CountHigh values.
4253                  */
4254                 if (written > wdata->bytes)
4255                         written &= 0xFFFF;
4256
4257                 if (written < wdata->bytes)
4258                         wdata->result = -ENOSPC;
4259                 else
4260                         wdata->bytes = written;
4261                 break;
4262         case MID_REQUEST_SUBMITTED:
4263         case MID_RETRY_NEEDED:
4264                 wdata->result = -EAGAIN;
4265                 break;
4266         case MID_RESPONSE_MALFORMED:
4267                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4268                 credits.instance = server->reconnect_instance;
4269                 fallthrough;
4270         default:
4271                 wdata->result = -EIO;
4272                 break;
4273         }
4274 #ifdef CONFIG_CIFS_SMB_DIRECT
4275         /*
4276          * If this wdata has a memory registered, the MR can be freed
4277          * The number of MRs available is limited, it's important to recover
4278          * used MR as soon as I/O is finished. Hold MR longer in the later
4279          * I/O process can possibly result in I/O deadlock due to lack of MR
4280          * to send request on I/O retry
4281          */
4282         if (wdata->mr) {
4283                 smbd_deregister_mr(wdata->mr);
4284                 wdata->mr = NULL;
4285         }
4286 #endif
4287         if (wdata->result) {
4288                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4289                 trace_smb3_write_err(0 /* no xid */,
4290                                      wdata->cfile->fid.persistent_fid,
4291                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4292                                      wdata->bytes, wdata->result);
4293                 if (wdata->result == -ENOSPC)
4294                         pr_warn_once("Out of space writing to %s\n",
4295                                      tcon->treeName);
4296         } else
4297                 trace_smb3_write_done(0 /* no xid */,
4298                                       wdata->cfile->fid.persistent_fid,
4299                                       tcon->tid, tcon->ses->Suid,
4300                                       wdata->offset, wdata->bytes);
4301
4302         queue_work(cifsiod_wq, &wdata->work);
4303         DeleteMidQEntry(mid);
4304         add_credits(server, &credits, 0);
4305 }
4306
4307 /* smb2_async_writev - send an async write, and set up mid to handle result */
4308 int
4309 smb2_async_writev(struct cifs_writedata *wdata,
4310                   void (*release)(struct kref *kref))
4311 {
4312         int rc = -EACCES, flags = 0;
4313         struct smb2_write_req *req = NULL;
4314         struct smb2_sync_hdr *shdr;
4315         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4316         struct TCP_Server_Info *server = wdata->server;
4317         struct kvec iov[1];
4318         struct smb_rqst rqst = { };
4319         unsigned int total_len;
4320
4321         if (!wdata->server)
4322                 server = wdata->server = cifs_pick_channel(tcon->ses);
4323
4324         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4325                                  (void **) &req, &total_len);
4326         if (rc)
4327                 return rc;
4328
4329         if (smb3_encryption_required(tcon))
4330                 flags |= CIFS_TRANSFORM_REQ;
4331
4332         shdr = (struct smb2_sync_hdr *)req;
4333         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4334
4335         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4336         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4337         req->WriteChannelInfoOffset = 0;
4338         req->WriteChannelInfoLength = 0;
4339         req->Channel = 0;
4340         req->Offset = cpu_to_le64(wdata->offset);
4341         req->DataOffset = cpu_to_le16(
4342                                 offsetof(struct smb2_write_req, Buffer));
4343         req->RemainingBytes = 0;
4344
4345         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4346                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4347 #ifdef CONFIG_CIFS_SMB_DIRECT
4348         /*
4349          * If we want to do a server RDMA read, fill in and append
4350          * smbd_buffer_descriptor_v1 to the end of write request
4351          */
4352         if (server->rdma && !server->sign && wdata->bytes >=
4353                 server->smbd_conn->rdma_readwrite_threshold) {
4354
4355                 struct smbd_buffer_descriptor_v1 *v1;
4356                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4357
4358                 wdata->mr = smbd_register_mr(
4359                                 server->smbd_conn, wdata->pages,
4360                                 wdata->nr_pages, wdata->page_offset,
4361                                 wdata->tailsz, false, need_invalidate);
4362                 if (!wdata->mr) {
4363                         rc = -EAGAIN;
4364                         goto async_writev_out;
4365                 }
4366                 req->Length = 0;
4367                 req->DataOffset = 0;
4368                 if (wdata->nr_pages > 1)
4369                         req->RemainingBytes =
4370                                 cpu_to_le32(
4371                                         (wdata->nr_pages - 1) * wdata->pagesz -
4372                                         wdata->page_offset + wdata->tailsz
4373                                 );
4374                 else
4375                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4376                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4377                 if (need_invalidate)
4378                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4379                 req->WriteChannelInfoOffset =
4380                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4381                 req->WriteChannelInfoLength =
4382                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4383                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4384                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4385                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4386                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4387         }
4388 #endif
4389         iov[0].iov_len = total_len - 1;
4390         iov[0].iov_base = (char *)req;
4391
4392         rqst.rq_iov = iov;
4393         rqst.rq_nvec = 1;
4394         rqst.rq_pages = wdata->pages;
4395         rqst.rq_offset = wdata->page_offset;
4396         rqst.rq_npages = wdata->nr_pages;
4397         rqst.rq_pagesz = wdata->pagesz;
4398         rqst.rq_tailsz = wdata->tailsz;
4399 #ifdef CONFIG_CIFS_SMB_DIRECT
4400         if (wdata->mr) {
4401                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4402                 rqst.rq_npages = 0;
4403         }
4404 #endif
4405         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4406                  wdata->offset, wdata->bytes);
4407
4408 #ifdef CONFIG_CIFS_SMB_DIRECT
4409         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4410         if (!wdata->mr)
4411                 req->Length = cpu_to_le32(wdata->bytes);
4412 #else
4413         req->Length = cpu_to_le32(wdata->bytes);
4414 #endif
4415
4416         if (wdata->credits.value > 0) {
4417                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4418                                                     SMB2_MAX_BUFFER_SIZE));
4419                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4420
4421                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4422                 if (rc)
4423                         goto async_writev_out;
4424
4425                 flags |= CIFS_HAS_CREDITS;
4426         }
4427
4428         kref_get(&wdata->refcount);
4429         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4430                              wdata, flags, &wdata->credits);
4431
4432         if (rc) {
4433                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4434                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4435                                      wdata->bytes, rc);
4436                 kref_put(&wdata->refcount, release);
4437                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4438         }
4439
4440 async_writev_out:
4441         cifs_small_buf_release(req);
4442         return rc;
4443 }
4444
4445 /*
4446  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4447  * The length field from io_parms must be at least 1 and indicates a number of
4448  * elements with data to write that begins with position 1 in iov array. All
4449  * data length is specified by count.
4450  */
4451 int
4452 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4453            unsigned int *nbytes, struct kvec *iov, int n_vec)
4454 {
4455         struct smb_rqst rqst;
4456         int rc = 0;
4457         struct smb2_write_req *req = NULL;
4458         struct smb2_write_rsp *rsp = NULL;
4459         int resp_buftype;
4460         struct kvec rsp_iov;
4461         int flags = 0;
4462         unsigned int total_len;
4463         struct TCP_Server_Info *server;
4464
4465         *nbytes = 0;
4466
4467         if (n_vec < 1)
4468                 return rc;
4469
4470         if (!io_parms->server)
4471                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4472         server = io_parms->server;
4473         if (server == NULL)
4474                 return -ECONNABORTED;
4475
4476         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4477                                  (void **) &req, &total_len);
4478         if (rc)
4479                 return rc;
4480
4481         if (smb3_encryption_required(io_parms->tcon))
4482                 flags |= CIFS_TRANSFORM_REQ;
4483
4484         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4485
4486         req->PersistentFileId = io_parms->persistent_fid;
4487         req->VolatileFileId = io_parms->volatile_fid;
4488         req->WriteChannelInfoOffset = 0;
4489         req->WriteChannelInfoLength = 0;
4490         req->Channel = 0;
4491         req->Length = cpu_to_le32(io_parms->length);
4492         req->Offset = cpu_to_le64(io_parms->offset);
4493         req->DataOffset = cpu_to_le16(
4494                                 offsetof(struct smb2_write_req, Buffer));
4495         req->RemainingBytes = 0;
4496
4497         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4498                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4499                 io_parms->offset, io_parms->length);
4500
4501         iov[0].iov_base = (char *)req;
4502         /* 1 for Buffer */
4503         iov[0].iov_len = total_len - 1;
4504
4505         memset(&rqst, 0, sizeof(struct smb_rqst));
4506         rqst.rq_iov = iov;
4507         rqst.rq_nvec = n_vec + 1;
4508
4509         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4510                             &rqst,
4511                             &resp_buftype, flags, &rsp_iov);
4512         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4513
4514         if (rc) {
4515                 trace_smb3_write_err(xid, req->PersistentFileId,
4516                                      io_parms->tcon->tid,
4517                                      io_parms->tcon->ses->Suid,
4518                                      io_parms->offset, io_parms->length, rc);
4519                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4520                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4521         } else {
4522                 *nbytes = le32_to_cpu(rsp->DataLength);
4523                 trace_smb3_write_done(xid, req->PersistentFileId,
4524                                      io_parms->tcon->tid,
4525                                      io_parms->tcon->ses->Suid,
4526                                      io_parms->offset, *nbytes);
4527         }
4528
4529         cifs_small_buf_release(req);
4530         free_rsp_buf(resp_buftype, rsp);
4531         return rc;
4532 }
4533
4534 int posix_info_sid_size(const void *beg, const void *end)
4535 {
4536         size_t subauth;
4537         int total;
4538
4539         if (beg + 1 > end)
4540                 return -1;
4541
4542         subauth = *(u8 *)(beg+1);
4543         if (subauth < 1 || subauth > 15)
4544                 return -1;
4545
4546         total = 1 + 1 + 6 + 4*subauth;
4547         if (beg + total > end)
4548                 return -1;
4549
4550         return total;
4551 }
4552
4553 int posix_info_parse(const void *beg, const void *end,
4554                      struct smb2_posix_info_parsed *out)
4555
4556 {
4557         int total_len = 0;
4558         int owner_len, group_len;
4559         int name_len;
4560         const void *owner_sid;
4561         const void *group_sid;
4562         const void *name;
4563
4564         /* if no end bound given, assume payload to be correct */
4565         if (!end) {
4566                 const struct smb2_posix_info *p = beg;
4567
4568                 end = beg + le32_to_cpu(p->NextEntryOffset);
4569                 /* last element will have a 0 offset, pick a sensible bound */
4570                 if (end == beg)
4571                         end += 0xFFFF;
4572         }
4573
4574         /* check base buf */
4575         if (beg + sizeof(struct smb2_posix_info) > end)
4576                 return -1;
4577         total_len = sizeof(struct smb2_posix_info);
4578
4579         /* check owner sid */
4580         owner_sid = beg + total_len;
4581         owner_len = posix_info_sid_size(owner_sid, end);
4582         if (owner_len < 0)
4583                 return -1;
4584         total_len += owner_len;
4585
4586         /* check group sid */
4587         group_sid = beg + total_len;
4588         group_len = posix_info_sid_size(group_sid, end);
4589         if (group_len < 0)
4590                 return -1;
4591         total_len += group_len;
4592
4593         /* check name len */
4594         if (beg + total_len + 4 > end)
4595                 return -1;
4596         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4597         if (name_len < 1 || name_len > 0xFFFF)
4598                 return -1;
4599         total_len += 4;
4600
4601         /* check name */
4602         name = beg + total_len;
4603         if (name + name_len > end)
4604                 return -1;
4605         total_len += name_len;
4606
4607         if (out) {
4608                 out->base = beg;
4609                 out->size = total_len;
4610                 out->name_len = name_len;
4611                 out->name = name;
4612                 memcpy(&out->owner, owner_sid, owner_len);
4613                 memcpy(&out->group, group_sid, group_len);
4614         }
4615         return total_len;
4616 }
4617
4618 static int posix_info_extra_size(const void *beg, const void *end)
4619 {
4620         int len = posix_info_parse(beg, end, NULL);
4621
4622         if (len < 0)
4623                 return -1;
4624         return len - sizeof(struct smb2_posix_info);
4625 }
4626
4627 static unsigned int
4628 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4629             size_t size)
4630 {
4631         int len;
4632         unsigned int entrycount = 0;
4633         unsigned int next_offset = 0;
4634         char *entryptr;
4635         FILE_DIRECTORY_INFO *dir_info;
4636
4637         if (bufstart == NULL)
4638                 return 0;
4639
4640         entryptr = bufstart;
4641
4642         while (1) {
4643                 if (entryptr + next_offset < entryptr ||
4644                     entryptr + next_offset > end_of_buf ||
4645                     entryptr + next_offset + size > end_of_buf) {
4646                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4647                         break;
4648                 }
4649
4650                 entryptr = entryptr + next_offset;
4651                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4652
4653                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4654                         len = posix_info_extra_size(entryptr, end_of_buf);
4655                 else
4656                         len = le32_to_cpu(dir_info->FileNameLength);
4657
4658                 if (len < 0 ||
4659                     entryptr + len < entryptr ||
4660                     entryptr + len > end_of_buf ||
4661                     entryptr + len + size > end_of_buf) {
4662                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4663                                  end_of_buf);
4664                         break;
4665                 }
4666
4667                 *lastentry = entryptr;
4668                 entrycount++;
4669
4670                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4671                 if (!next_offset)
4672                         break;
4673         }
4674
4675         return entrycount;
4676 }
4677
4678 /*
4679  * Readdir/FindFirst
4680  */
4681 int SMB2_query_directory_init(const unsigned int xid,
4682                               struct cifs_tcon *tcon,
4683                               struct TCP_Server_Info *server,
4684                               struct smb_rqst *rqst,
4685                               u64 persistent_fid, u64 volatile_fid,
4686                               int index, int info_level)
4687 {
4688         struct smb2_query_directory_req *req;
4689         unsigned char *bufptr;
4690         __le16 asteriks = cpu_to_le16('*');
4691         unsigned int output_size = CIFSMaxBufSize -
4692                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4693                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4694         unsigned int total_len;
4695         struct kvec *iov = rqst->rq_iov;
4696         int len, rc;
4697
4698         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4699                                  (void **) &req, &total_len);
4700         if (rc)
4701                 return rc;
4702
4703         switch (info_level) {
4704         case SMB_FIND_FILE_DIRECTORY_INFO:
4705                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4706                 break;
4707         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4708                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4709                 break;
4710         case SMB_FIND_FILE_POSIX_INFO:
4711                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4712                 break;
4713         default:
4714                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4715                         info_level);
4716                 return -EINVAL;
4717         }
4718
4719         req->FileIndex = cpu_to_le32(index);
4720         req->PersistentFileId = persistent_fid;
4721         req->VolatileFileId = volatile_fid;
4722
4723         len = 0x2;
4724         bufptr = req->Buffer;
4725         memcpy(bufptr, &asteriks, len);
4726
4727         req->FileNameOffset =
4728                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4729         req->FileNameLength = cpu_to_le16(len);
4730         /*
4731          * BB could be 30 bytes or so longer if we used SMB2 specific
4732          * buffer lengths, but this is safe and close enough.
4733          */
4734         output_size = min_t(unsigned int, output_size, server->maxBuf);
4735         output_size = min_t(unsigned int, output_size, 2 << 15);
4736         req->OutputBufferLength = cpu_to_le32(output_size);
4737
4738         iov[0].iov_base = (char *)req;
4739         /* 1 for Buffer */
4740         iov[0].iov_len = total_len - 1;
4741
4742         iov[1].iov_base = (char *)(req->Buffer);
4743         iov[1].iov_len = len;
4744
4745         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4746                         tcon->ses->Suid, index, output_size);
4747
4748         return 0;
4749 }
4750
4751 void SMB2_query_directory_free(struct smb_rqst *rqst)
4752 {
4753         if (rqst && rqst->rq_iov) {
4754                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4755         }
4756 }
4757
4758 int
4759 smb2_parse_query_directory(struct cifs_tcon *tcon,
4760                            struct kvec *rsp_iov,
4761                            int resp_buftype,
4762                            struct cifs_search_info *srch_inf)
4763 {
4764         struct smb2_query_directory_rsp *rsp;
4765         size_t info_buf_size;
4766         char *end_of_smb;
4767         int rc;
4768
4769         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4770
4771         switch (srch_inf->info_level) {
4772         case SMB_FIND_FILE_DIRECTORY_INFO:
4773                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4774                 break;
4775         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4776                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4777                 break;
4778         case SMB_FIND_FILE_POSIX_INFO:
4779                 /* note that posix payload are variable size */
4780                 info_buf_size = sizeof(struct smb2_posix_info);
4781                 break;
4782         default:
4783                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4784                          srch_inf->info_level);
4785                 return -EINVAL;
4786         }
4787
4788         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4789                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4790                                info_buf_size);
4791         if (rc) {
4792                 cifs_tcon_dbg(VFS, "bad info payload");
4793                 return rc;
4794         }
4795
4796         srch_inf->unicode = true;
4797
4798         if (srch_inf->ntwrk_buf_start) {
4799                 if (srch_inf->smallBuf)
4800                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4801                 else
4802                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4803         }
4804         srch_inf->ntwrk_buf_start = (char *)rsp;
4805         srch_inf->srch_entries_start = srch_inf->last_entry =
4806                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4807         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4808
4809         srch_inf->entries_in_buffer = num_entries(
4810                 srch_inf->info_level,
4811                 srch_inf->srch_entries_start,
4812                 end_of_smb,
4813                 &srch_inf->last_entry,
4814                 info_buf_size);
4815
4816         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4817         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4818                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4819                  srch_inf->srch_entries_start, srch_inf->last_entry);
4820         if (resp_buftype == CIFS_LARGE_BUFFER)
4821                 srch_inf->smallBuf = false;
4822         else if (resp_buftype == CIFS_SMALL_BUFFER)
4823                 srch_inf->smallBuf = true;
4824         else
4825                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4826
4827         return 0;
4828 }
4829
4830 int
4831 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4832                      u64 persistent_fid, u64 volatile_fid, int index,
4833                      struct cifs_search_info *srch_inf)
4834 {
4835         struct smb_rqst rqst;
4836         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4837         struct smb2_query_directory_rsp *rsp = NULL;
4838         int resp_buftype = CIFS_NO_BUFFER;
4839         struct kvec rsp_iov;
4840         int rc = 0;
4841         struct cifs_ses *ses = tcon->ses;
4842         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4843         int flags = 0;
4844
4845         if (!ses || !(ses->server))
4846                 return -EIO;
4847
4848         if (smb3_encryption_required(tcon))
4849                 flags |= CIFS_TRANSFORM_REQ;
4850
4851         memset(&rqst, 0, sizeof(struct smb_rqst));
4852         memset(&iov, 0, sizeof(iov));
4853         rqst.rq_iov = iov;
4854         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4855
4856         rc = SMB2_query_directory_init(xid, tcon, server,
4857                                        &rqst, persistent_fid,
4858                                        volatile_fid, index,
4859                                        srch_inf->info_level);
4860         if (rc)
4861                 goto qdir_exit;
4862
4863         rc = cifs_send_recv(xid, ses, server,
4864                             &rqst, &resp_buftype, flags, &rsp_iov);
4865         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4866
4867         if (rc) {
4868                 if (rc == -ENODATA &&
4869                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4870                         trace_smb3_query_dir_done(xid, persistent_fid,
4871                                 tcon->tid, tcon->ses->Suid, index, 0);
4872                         srch_inf->endOfSearch = true;
4873                         rc = 0;
4874                 } else {
4875                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4876                                 tcon->ses->Suid, index, 0, rc);
4877                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4878                 }
4879                 goto qdir_exit;
4880         }
4881
4882         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4883                                         srch_inf);
4884         if (rc) {
4885                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4886                         tcon->ses->Suid, index, 0, rc);
4887                 goto qdir_exit;
4888         }
4889         resp_buftype = CIFS_NO_BUFFER;
4890
4891         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4892                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4893
4894 qdir_exit:
4895         SMB2_query_directory_free(&rqst);
4896         free_rsp_buf(resp_buftype, rsp);
4897         return rc;
4898 }
4899
4900 int
4901 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4902                    struct smb_rqst *rqst,
4903                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4904                    u8 info_class, u8 info_type, u32 additional_info,
4905                    void **data, unsigned int *size)
4906 {
4907         struct smb2_set_info_req *req;
4908         struct kvec *iov = rqst->rq_iov;
4909         unsigned int i, total_len;
4910         int rc;
4911
4912         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4913                                  (void **) &req, &total_len);
4914         if (rc)
4915                 return rc;
4916
4917         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4918         req->InfoType = info_type;
4919         req->FileInfoClass = info_class;
4920         req->PersistentFileId = persistent_fid;
4921         req->VolatileFileId = volatile_fid;
4922         req->AdditionalInformation = cpu_to_le32(additional_info);
4923
4924         req->BufferOffset =
4925                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4926         req->BufferLength = cpu_to_le32(*size);
4927
4928         memcpy(req->Buffer, *data, *size);
4929         total_len += *size;
4930
4931         iov[0].iov_base = (char *)req;
4932         /* 1 for Buffer */
4933         iov[0].iov_len = total_len - 1;
4934
4935         for (i = 1; i < rqst->rq_nvec; i++) {
4936                 le32_add_cpu(&req->BufferLength, size[i]);
4937                 iov[i].iov_base = (char *)data[i];
4938                 iov[i].iov_len = size[i];
4939         }
4940
4941         return 0;
4942 }
4943
4944 void
4945 SMB2_set_info_free(struct smb_rqst *rqst)
4946 {
4947         if (rqst && rqst->rq_iov)
4948                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4949 }
4950
4951 static int
4952 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4953                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4954                u8 info_type, u32 additional_info, unsigned int num,
4955                 void **data, unsigned int *size)
4956 {
4957         struct smb_rqst rqst;
4958         struct smb2_set_info_rsp *rsp = NULL;
4959         struct kvec *iov;
4960         struct kvec rsp_iov;
4961         int rc = 0;
4962         int resp_buftype;
4963         struct cifs_ses *ses = tcon->ses;
4964         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4965         int flags = 0;
4966
4967         if (!ses || !server)
4968                 return -EIO;
4969
4970         if (!num)
4971                 return -EINVAL;
4972
4973         if (smb3_encryption_required(tcon))
4974                 flags |= CIFS_TRANSFORM_REQ;
4975
4976         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4977         if (!iov)
4978                 return -ENOMEM;
4979
4980         memset(&rqst, 0, sizeof(struct smb_rqst));
4981         rqst.rq_iov = iov;
4982         rqst.rq_nvec = num;
4983
4984         rc = SMB2_set_info_init(tcon, server,
4985                                 &rqst, persistent_fid, volatile_fid, pid,
4986                                 info_class, info_type, additional_info,
4987                                 data, size);
4988         if (rc) {
4989                 kfree(iov);
4990                 return rc;
4991         }
4992
4993
4994         rc = cifs_send_recv(xid, ses, server,
4995                             &rqst, &resp_buftype, flags,
4996                             &rsp_iov);
4997         SMB2_set_info_free(&rqst);
4998         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4999
5000         if (rc != 0) {
5001                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5002                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5003                                 ses->Suid, info_class, (__u32)info_type, rc);
5004         }
5005
5006         free_rsp_buf(resp_buftype, rsp);
5007         kfree(iov);
5008         return rc;
5009 }
5010
5011 int
5012 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5013              u64 volatile_fid, u32 pid, __le64 *eof)
5014 {
5015         struct smb2_file_eof_info info;
5016         void *data;
5017         unsigned int size;
5018
5019         info.EndOfFile = *eof;
5020
5021         data = &info;
5022         size = sizeof(struct smb2_file_eof_info);
5023
5024         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5025                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5026                         0, 1, &data, &size);
5027 }
5028
5029 int
5030 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5031                 u64 persistent_fid, u64 volatile_fid,
5032                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5033 {
5034         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5035                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5036                         1, (void **)&pnntsd, &pacllen);
5037 }
5038
5039 int
5040 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5041             u64 persistent_fid, u64 volatile_fid,
5042             struct smb2_file_full_ea_info *buf, int len)
5043 {
5044         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5045                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5046                 0, 1, (void **)&buf, &len);
5047 }
5048
5049 int
5050 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5051                   const u64 persistent_fid, const u64 volatile_fid,
5052                   __u8 oplock_level)
5053 {
5054         struct smb_rqst rqst;
5055         int rc;
5056         struct smb2_oplock_break *req = NULL;
5057         struct cifs_ses *ses = tcon->ses;
5058         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5059         int flags = CIFS_OBREAK_OP;
5060         unsigned int total_len;
5061         struct kvec iov[1];
5062         struct kvec rsp_iov;
5063         int resp_buf_type;
5064
5065         cifs_dbg(FYI, "SMB2_oplock_break\n");
5066         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5067                                  (void **) &req, &total_len);
5068         if (rc)
5069                 return rc;
5070
5071         if (smb3_encryption_required(tcon))
5072                 flags |= CIFS_TRANSFORM_REQ;
5073
5074         req->VolatileFid = volatile_fid;
5075         req->PersistentFid = persistent_fid;
5076         req->OplockLevel = oplock_level;
5077         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5078
5079         flags |= CIFS_NO_RSP_BUF;
5080
5081         iov[0].iov_base = (char *)req;
5082         iov[0].iov_len = total_len;
5083
5084         memset(&rqst, 0, sizeof(struct smb_rqst));
5085         rqst.rq_iov = iov;
5086         rqst.rq_nvec = 1;
5087
5088         rc = cifs_send_recv(xid, ses, server,
5089                             &rqst, &resp_buf_type, flags, &rsp_iov);
5090         cifs_small_buf_release(req);
5091
5092         if (rc) {
5093                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5094                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5095         }
5096
5097         return rc;
5098 }
5099
5100 void
5101 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5102                              struct kstatfs *kst)
5103 {
5104         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5105                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5106         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5107         kst->f_bfree  = kst->f_bavail =
5108                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5109         return;
5110 }
5111
5112 static void
5113 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5114                         struct kstatfs *kst)
5115 {
5116         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5117         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5118         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5119         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5120                 kst->f_bavail = kst->f_bfree;
5121         else
5122                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5123         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5124                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5125         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5126                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5127
5128         return;
5129 }
5130
5131 static int
5132 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5133                    struct TCP_Server_Info *server,
5134                    int level, int outbuf_len, u64 persistent_fid,
5135                    u64 volatile_fid)
5136 {
5137         int rc;
5138         struct smb2_query_info_req *req;
5139         unsigned int total_len;
5140
5141         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5142
5143         if ((tcon->ses == NULL) || server == NULL)
5144                 return -EIO;
5145
5146         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5147                                  (void **) &req, &total_len);
5148         if (rc)
5149                 return rc;
5150
5151         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5152         req->FileInfoClass = level;
5153         req->PersistentFileId = persistent_fid;
5154         req->VolatileFileId = volatile_fid;
5155         /* 1 for pad */
5156         req->InputBufferOffset =
5157                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5158         req->OutputBufferLength = cpu_to_le32(
5159                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5160
5161         iov->iov_base = (char *)req;
5162         iov->iov_len = total_len;
5163         return 0;
5164 }
5165
5166 int
5167 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5168               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5169 {
5170         struct smb_rqst rqst;
5171         struct smb2_query_info_rsp *rsp = NULL;
5172         struct kvec iov;
5173         struct kvec rsp_iov;
5174         int rc = 0;
5175         int resp_buftype;
5176         struct cifs_ses *ses = tcon->ses;
5177         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5178         FILE_SYSTEM_POSIX_INFO *info = NULL;
5179         int flags = 0;
5180
5181         rc = build_qfs_info_req(&iov, tcon, server,
5182                                 FS_POSIX_INFORMATION,
5183                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5184                                 persistent_fid, volatile_fid);
5185         if (rc)
5186                 return rc;
5187
5188         if (smb3_encryption_required(tcon))
5189                 flags |= CIFS_TRANSFORM_REQ;
5190
5191         memset(&rqst, 0, sizeof(struct smb_rqst));
5192         rqst.rq_iov = &iov;
5193         rqst.rq_nvec = 1;
5194
5195         rc = cifs_send_recv(xid, ses, server,
5196                             &rqst, &resp_buftype, flags, &rsp_iov);
5197         cifs_small_buf_release(iov.iov_base);
5198         if (rc) {
5199                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5200                 goto posix_qfsinf_exit;
5201         }
5202         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5203
5204         info = (FILE_SYSTEM_POSIX_INFO *)(
5205                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5206         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5207                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5208                                sizeof(FILE_SYSTEM_POSIX_INFO));
5209         if (!rc)
5210                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5211
5212 posix_qfsinf_exit:
5213         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5214         return rc;
5215 }
5216
5217 int
5218 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5219               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5220 {
5221         struct smb_rqst rqst;
5222         struct smb2_query_info_rsp *rsp = NULL;
5223         struct kvec iov;
5224         struct kvec rsp_iov;
5225         int rc = 0;
5226         int resp_buftype;
5227         struct cifs_ses *ses = tcon->ses;
5228         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5229         struct smb2_fs_full_size_info *info = NULL;
5230         int flags = 0;
5231
5232         rc = build_qfs_info_req(&iov, tcon, server,
5233                                 FS_FULL_SIZE_INFORMATION,
5234                                 sizeof(struct smb2_fs_full_size_info),
5235                                 persistent_fid, volatile_fid);
5236         if (rc)
5237                 return rc;
5238
5239         if (smb3_encryption_required(tcon))
5240                 flags |= CIFS_TRANSFORM_REQ;
5241
5242         memset(&rqst, 0, sizeof(struct smb_rqst));
5243         rqst.rq_iov = &iov;
5244         rqst.rq_nvec = 1;
5245
5246         rc = cifs_send_recv(xid, ses, server,
5247                             &rqst, &resp_buftype, flags, &rsp_iov);
5248         cifs_small_buf_release(iov.iov_base);
5249         if (rc) {
5250                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5251                 goto qfsinf_exit;
5252         }
5253         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5254
5255         info = (struct smb2_fs_full_size_info *)(
5256                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5257         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5258                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5259                                sizeof(struct smb2_fs_full_size_info));
5260         if (!rc)
5261                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5262
5263 qfsinf_exit:
5264         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5265         return rc;
5266 }
5267
5268 int
5269 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5270               u64 persistent_fid, u64 volatile_fid, int level)
5271 {
5272         struct smb_rqst rqst;
5273         struct smb2_query_info_rsp *rsp = NULL;
5274         struct kvec iov;
5275         struct kvec rsp_iov;
5276         int rc = 0;
5277         int resp_buftype, max_len, min_len;
5278         struct cifs_ses *ses = tcon->ses;
5279         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5280         unsigned int rsp_len, offset;
5281         int flags = 0;
5282
5283         if (level == FS_DEVICE_INFORMATION) {
5284                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5285                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5286         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5287                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5288                 min_len = MIN_FS_ATTR_INFO_SIZE;
5289         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5290                 max_len = sizeof(struct smb3_fs_ss_info);
5291                 min_len = sizeof(struct smb3_fs_ss_info);
5292         } else if (level == FS_VOLUME_INFORMATION) {
5293                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5294                 min_len = sizeof(struct smb3_fs_vol_info);
5295         } else {
5296                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5297                 return -EINVAL;
5298         }
5299
5300         rc = build_qfs_info_req(&iov, tcon, server,
5301                                 level, max_len,
5302                                 persistent_fid, volatile_fid);
5303         if (rc)
5304                 return rc;
5305
5306         if (smb3_encryption_required(tcon))
5307                 flags |= CIFS_TRANSFORM_REQ;
5308
5309         memset(&rqst, 0, sizeof(struct smb_rqst));
5310         rqst.rq_iov = &iov;
5311         rqst.rq_nvec = 1;
5312
5313         rc = cifs_send_recv(xid, ses, server,
5314                             &rqst, &resp_buftype, flags, &rsp_iov);
5315         cifs_small_buf_release(iov.iov_base);
5316         if (rc) {
5317                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5318                 goto qfsattr_exit;
5319         }
5320         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5321
5322         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5323         offset = le16_to_cpu(rsp->OutputBufferOffset);
5324         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5325         if (rc)
5326                 goto qfsattr_exit;
5327
5328         if (level == FS_ATTRIBUTE_INFORMATION)
5329                 memcpy(&tcon->fsAttrInfo, offset
5330                         + (char *)rsp, min_t(unsigned int,
5331                         rsp_len, max_len));
5332         else if (level == FS_DEVICE_INFORMATION)
5333                 memcpy(&tcon->fsDevInfo, offset
5334                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5335         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5336                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5337                         (offset + (char *)rsp);
5338                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5339                 tcon->perf_sector_size =
5340                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5341         } else if (level == FS_VOLUME_INFORMATION) {
5342                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5343                         (offset + (char *)rsp);
5344                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5345                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5346         }
5347
5348 qfsattr_exit:
5349         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5350         return rc;
5351 }
5352
5353 int
5354 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5355            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5356            const __u32 num_lock, struct smb2_lock_element *buf)
5357 {
5358         struct smb_rqst rqst;
5359         int rc = 0;
5360         struct smb2_lock_req *req = NULL;
5361         struct kvec iov[2];
5362         struct kvec rsp_iov;
5363         int resp_buf_type;
5364         unsigned int count;
5365         int flags = CIFS_NO_RSP_BUF;
5366         unsigned int total_len;
5367         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5368
5369         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5370
5371         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5372                                  (void **) &req, &total_len);
5373         if (rc)
5374                 return rc;
5375
5376         if (smb3_encryption_required(tcon))
5377                 flags |= CIFS_TRANSFORM_REQ;
5378
5379         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5380         req->LockCount = cpu_to_le16(num_lock);
5381
5382         req->PersistentFileId = persist_fid;
5383         req->VolatileFileId = volatile_fid;
5384
5385         count = num_lock * sizeof(struct smb2_lock_element);
5386
5387         iov[0].iov_base = (char *)req;
5388         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5389         iov[1].iov_base = (char *)buf;
5390         iov[1].iov_len = count;
5391
5392         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5393
5394         memset(&rqst, 0, sizeof(struct smb_rqst));
5395         rqst.rq_iov = iov;
5396         rqst.rq_nvec = 2;
5397
5398         rc = cifs_send_recv(xid, tcon->ses, server,
5399                             &rqst, &resp_buf_type, flags,
5400                             &rsp_iov);
5401         cifs_small_buf_release(req);
5402         if (rc) {
5403                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5404                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5405                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5406                                     tcon->ses->Suid, rc);
5407         }
5408
5409         return rc;
5410 }
5411
5412 int
5413 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5414           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5415           const __u64 length, const __u64 offset, const __u32 lock_flags,
5416           const bool wait)
5417 {
5418         struct smb2_lock_element lock;
5419
5420         lock.Offset = cpu_to_le64(offset);
5421         lock.Length = cpu_to_le64(length);
5422         lock.Flags = cpu_to_le32(lock_flags);
5423         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5424                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5425
5426         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5427 }
5428
5429 int
5430 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5431                  __u8 *lease_key, const __le32 lease_state)
5432 {
5433         struct smb_rqst rqst;
5434         int rc;
5435         struct smb2_lease_ack *req = NULL;
5436         struct cifs_ses *ses = tcon->ses;
5437         int flags = CIFS_OBREAK_OP;
5438         unsigned int total_len;
5439         struct kvec iov[1];
5440         struct kvec rsp_iov;
5441         int resp_buf_type;
5442         __u64 *please_key_high;
5443         __u64 *please_key_low;
5444         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5445
5446         cifs_dbg(FYI, "SMB2_lease_break\n");
5447         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5448                                  (void **) &req, &total_len);
5449         if (rc)
5450                 return rc;
5451
5452         if (smb3_encryption_required(tcon))
5453                 flags |= CIFS_TRANSFORM_REQ;
5454
5455         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5456         req->StructureSize = cpu_to_le16(36);
5457         total_len += 12;
5458
5459         memcpy(req->LeaseKey, lease_key, 16);
5460         req->LeaseState = lease_state;
5461
5462         flags |= CIFS_NO_RSP_BUF;
5463
5464         iov[0].iov_base = (char *)req;
5465         iov[0].iov_len = total_len;
5466
5467         memset(&rqst, 0, sizeof(struct smb_rqst));
5468         rqst.rq_iov = iov;
5469         rqst.rq_nvec = 1;
5470
5471         rc = cifs_send_recv(xid, ses, server,
5472                             &rqst, &resp_buf_type, flags, &rsp_iov);
5473         cifs_small_buf_release(req);
5474
5475         please_key_low = (__u64 *)lease_key;
5476         please_key_high = (__u64 *)(lease_key+8);
5477         if (rc) {
5478                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5479                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5480                         ses->Suid, *please_key_low, *please_key_high, rc);
5481                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5482         } else
5483                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5484                         ses->Suid, *please_key_low, *please_key_high);
5485
5486         return rc;
5487 }