fs/cifs/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *   fs/cifs/smb2pdu.c
   4  *
   5  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   6  *                 Etersoft, 2012
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   9  *
  10  *   Contains the routines for constructing the SMB2 PDUs themselves
  11  *
  12  */
  13
  14  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  15  /* Note that there are handle based routines which must be                   */
  16  /* treated slightly differently for reconnection purposes since we never     */
  17  /* want to reuse a stale file handle and only the caller knows the file info */
  18
  19 #include <linux/fs.h>
  20 #include <linux/kernel.h>
  21 #include <linux/vfs.h>
  22 #include <linux/task_io_accounting_ops.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/uuid.h>
  25 #include <linux/pagemap.h>
  26 #include <linux/xattr.h>
  27 #include "smb2pdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsacl.h"
  30 #include "cifsproto.h"
  31 #include "smb2proto.h"
  32 #include "cifs_unicode.h"
  33 #include "cifs_debug.h"
  34 #include "ntlmssp.h"
  35 #include "smb2status.h"
  36 #include "smb2glob.h"
  37 #include "cifspdu.h"
  38 #include "cifs_spnego.h"
  39 #include "smbdirect.h"
  40 #include "trace.h"
  41 #ifdef CONFIG_CIFS_DFS_UPCALL
  42 #include "dfs_cache.h"
  43 #endif
  44
  45 /*
  46  *  The following table defines the expected "StructureSize" of SMB2 requests
  47  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  48  *
  49  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  50  *  indexed by command in host byte order.
  51  */
  52 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  53         /* SMB2_NEGOTIATE */ 36,
  54         /* SMB2_SESSION_SETUP */ 25,
  55         /* SMB2_LOGOFF */ 4,
  56         /* SMB2_TREE_CONNECT */ 9,
  57         /* SMB2_TREE_DISCONNECT */ 4,
  58         /* SMB2_CREATE */ 57,
  59         /* SMB2_CLOSE */ 24,
  60         /* SMB2_FLUSH */ 24,
  61         /* SMB2_READ */ 49,
  62         /* SMB2_WRITE */ 49,
  63         /* SMB2_LOCK */ 48,
  64         /* SMB2_IOCTL */ 57,
  65         /* SMB2_CANCEL */ 4,
  66         /* SMB2_ECHO */ 4,
  67         /* SMB2_QUERY_DIRECTORY */ 33,
  68         /* SMB2_CHANGE_NOTIFY */ 32,
  69         /* SMB2_QUERY_INFO */ 41,
  70         /* SMB2_SET_INFO */ 33,
  71         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  72 };
  73
  74 int smb3_encryption_required(const struct cifs_tcon *tcon)
  75 {
  76         if (!tcon || !tcon->ses)
  77                 return 0;
  78         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  79             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  80                 return 1;
  81         if (tcon->seal &&
  82             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  83                 return 1;
  84         return 0;
  85 }
  86
  87 static void
  88 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  89                   const struct cifs_tcon *tcon,
  90                   struct TCP_Server_Info *server)
  91 {
  92         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  93         shdr->StructureSize = cpu_to_le16(64);
  94         shdr->Command = smb2_cmd;
  95         if (server) {
  96                 spin_lock(&server->req_lock);
  97                 /* Request up to 10 credits but don't go over the limit. */
  98                 if (server->credits >= server->max_credits)
  99                         shdr->CreditRequest = cpu_to_le16(0);
 100                 else
 101                         shdr->CreditRequest = cpu_to_le16(
 102                                 min_t(int, server->max_credits -
 103                                                 server->credits, 10));
 104                 spin_unlock(&server->req_lock);
 105         } else {
 106                 shdr->CreditRequest = cpu_to_le16(2);
 107         }
 108         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 109
 110         if (!tcon)
 111                 goto out;
 112
 113         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 114         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 115         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 shdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         shdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 shdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (server && server->sign && !smb3_encryption_required(tcon))
 138                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         return;
 141 }
 142
 143 static int
 144 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 145                struct TCP_Server_Info *server)
 146 {
 147         int rc;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         int retries;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return 0;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return 0;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server) || !server)
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         retries = server->nr_targets;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to each target available for
 186          * reconnect -- should be greater than cifs socket timeout which is 7
 187          * seconds.
 188          */
 189         while (server->tcpStatus == CifsNeedReconnect) {
 190                 /*
 191                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 192                  * here since they are implicitly done when session drops.
 193                  */
 194                 switch (smb2_command) {
 195                 /*
 196                  * BB Should we keep oplock break and add flush to exceptions?
 197                  */
 198                 case SMB2_TREE_DISCONNECT:
 199                 case SMB2_CANCEL:
 200                 case SMB2_CLOSE:
 201                 case SMB2_OPLOCK_BREAK:
 202                         return -EAGAIN;
 203                 }
 204
 205                 rc = wait_event_interruptible_timeout(server->response_q,
 206                                                       (server->tcpStatus != CifsNeedReconnect),
 207                                                       10 * HZ);
 208                 if (rc < 0) {
 209                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 210                                  __func__);
 211                         return -ERESTARTSYS;
 212                 }
 213
 214                 /* are we still trying to reconnect? */
 215                 if (server->tcpStatus != CifsNeedReconnect)
 216                         break;
 217
 218                 if (retries && --retries)
 219                         continue;
 220
 221                 /*
 222                  * on "soft" mounts we wait once. Hard mounts keep
 223                  * retrying until process is killed or server comes
 224                  * back on-line
 225                  */
 226                 if (!tcon->retry) {
 227                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 228                         return -EHOSTDOWN;
 229                 }
 230                 retries = server->nr_targets;
 231         }
 232
 233         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 234                 return 0;
 235
 236         nls_codepage = load_nls_default();
 237
 238         /*
 239          * need to prevent multiple threads trying to simultaneously reconnect
 240          * the same SMB session
 241          */
 242         mutex_lock(&tcon->ses->session_mutex);
 243
 244         /*
 245          * Recheck after acquire mutex. If another thread is negotiating
 246          * and the server never sends an answer the socket will be closed
 247          * and tcpStatus set to reconnect.
 248          */
 249         if (server->tcpStatus == CifsNeedReconnect) {
 250                 rc = -EHOSTDOWN;
 251                 mutex_unlock(&tcon->ses->session_mutex);
 252                 goto out;
 253         }
 254
 255         /*
 256          * If we are reconnecting an extra channel, bind
 257          */
 258         if (server->is_channel) {
 259                 ses->binding = true;
 260                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 261         }
 262
 263         rc = cifs_negotiate_protocol(0, tcon->ses);
 264         if (!rc && tcon->ses->need_reconnect) {
 265                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 266                 if ((rc == -EACCES) && !tcon->retry) {
 267                         rc = -EHOSTDOWN;
 268                         ses->binding = false;
 269                         ses->binding_chan = NULL;
 270                         mutex_unlock(&tcon->ses->session_mutex);
 271                         goto failed;
 272                 }
 273         }
 274         /*
 275          * End of channel binding
 276          */
 277         ses->binding = false;
 278         ses->binding_chan = NULL;
 279
 280         if (rc || !tcon->need_reconnect) {
 281                 mutex_unlock(&tcon->ses->session_mutex);
 282                 goto out;
 283         }
 284
 285         cifs_mark_open_files_invalid(tcon);
 286         if (tcon->use_persistent)
 287                 tcon->need_reopen_files = true;
 288
 289         rc = cifs_tree_connect(0, tcon, nls_codepage);
 290         mutex_unlock(&tcon->ses->session_mutex);
 291
 292         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 293         if (rc) {
 294                 /* If sess reconnected but tcon didn't, something strange ... */
 295                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 296                 goto out;
 297         }
 298
 299         if (smb2_command != SMB2_INTERNAL_CMD)
 300                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 301
 302         atomic_inc(&tconInfoReconnectCount);
 303 out:
 304         /*
 305          * Check if handle based operation so we know whether we can continue
 306          * or not without returning to caller to reset file handle.
 307          */
 308         /*
 309          * BB Is flush done by server on drop of tcp session? Should we special
 310          * case it and skip above?
 311          */
 312         switch (smb2_command) {
 313         case SMB2_FLUSH:
 314         case SMB2_READ:
 315         case SMB2_WRITE:
 316         case SMB2_LOCK:
 317         case SMB2_IOCTL:
 318         case SMB2_QUERY_DIRECTORY:
 319         case SMB2_CHANGE_NOTIFY:
 320         case SMB2_QUERY_INFO:
 321         case SMB2_SET_INFO:
 322                 rc = -EAGAIN;
 323         }
 324 failed:
 325         unload_nls(nls_codepage);
 326         return rc;
 327 }
 328
 329 static void
 330 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 331                struct TCP_Server_Info *server,
 332                void *buf,
 333                unsigned int *total_len)
 334 {
 335         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 336         /* lookup word count ie StructureSize from table */
 337         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 338
 339         /*
 340          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 341          * largest operations (Create)
 342          */
 343         memset(buf, 0, 256);
 344
 345         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 346         spdu->StructureSize2 = cpu_to_le16(parmsize);
 347
 348         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 349 }
 350
 351 /*
 352  * Allocate and return pointer to an SMB request hdr, and set basic
 353  * SMB information in the SMB header. If the return code is zero, this
 354  * function must have filled in request_buf pointer.
 355  */
 356 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 357                                  struct TCP_Server_Info *server,
 358                                  void **request_buf, unsigned int *total_len)
 359 {
 360         /* BB eventually switch this to SMB2 specific small buf size */
 361         if (smb2_command == SMB2_SET_INFO)
 362                 *request_buf = cifs_buf_get();
 363         else
 364                 *request_buf = cifs_small_buf_get();
 365         if (*request_buf == NULL) {
 366                 /* BB should we add a retry in here if not a writepage? */
 367                 return -ENOMEM;
 368         }
 369
 370         fill_small_buf(smb2_command, tcon, server,
 371                        (struct smb2_sync_hdr *)(*request_buf),
 372                        total_len);
 373
 374         if (tcon != NULL) {
 375                 uint16_t com_code = le16_to_cpu(smb2_command);
 376                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 377                 cifs_stats_inc(&tcon->num_smbs_sent);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 384                                struct TCP_Server_Info *server,
 385                                void **request_buf, unsigned int *total_len)
 386 {
 387         int rc;
 388
 389         rc = smb2_reconnect(smb2_command, tcon, server);
 390         if (rc)
 391                 return rc;
 392
 393         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 394                                      total_len);
 395 }
 396
 397 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 398                                struct TCP_Server_Info *server,
 399                                void **request_buf, unsigned int *total_len)
 400 {
 401         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 402         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 403                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 404                                              request_buf, total_len);
 405         }
 406         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 407                                    request_buf, total_len);
 408 }
 409
 410 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 411
 412 static void
 413 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 414 {
 415         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 416         pneg_ctxt->DataLength = cpu_to_le16(38);
 417         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 418         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 419         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 420         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 421 }
 422
 423 static void
 424 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 425 {
 426         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 427         pneg_ctxt->DataLength =
 428                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 429                           - sizeof(struct smb2_neg_context));
 430         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 431         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 432         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 433         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 434 }
 435
 436 static void
 437 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 438 {
 439         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 440         if (require_gcm_256) {
 441                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 442                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 443                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 444         } else if (enable_gcm_256) {
 445                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 446                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 447                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 448                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 449                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 450         } else {
 451                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 452                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 453                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 454                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 455         }
 456 }
 457
 458 static unsigned int
 459 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 460 {
 461         struct nls_table *cp = load_nls_default();
 462
 463         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 464
 465         /* copy up to max of first 100 bytes of server name to NetName field */
 466         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 467         /* context size is DataLength + minimal smb2_neg_context */
 468         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 469                         sizeof(struct smb2_neg_context), 8) * 8;
 470 }
 471
 472 static void
 473 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 474 {
 475         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 476         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 477         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 478         pneg_ctxt->Name[0] = 0x93;
 479         pneg_ctxt->Name[1] = 0xAD;
 480         pneg_ctxt->Name[2] = 0x25;
 481         pneg_ctxt->Name[3] = 0x50;
 482         pneg_ctxt->Name[4] = 0x9C;
 483         pneg_ctxt->Name[5] = 0xB4;
 484         pneg_ctxt->Name[6] = 0x11;
 485         pneg_ctxt->Name[7] = 0xE7;
 486         pneg_ctxt->Name[8] = 0xB4;
 487         pneg_ctxt->Name[9] = 0x23;
 488         pneg_ctxt->Name[10] = 0x83;
 489         pneg_ctxt->Name[11] = 0xDE;
 490         pneg_ctxt->Name[12] = 0x96;
 491         pneg_ctxt->Name[13] = 0x8B;
 492         pneg_ctxt->Name[14] = 0xCD;
 493         pneg_ctxt->Name[15] = 0x7C;
 494 }
 495
 496 static void
 497 assemble_neg_contexts(struct smb2_negotiate_req *req,
 498                       struct TCP_Server_Info *server, unsigned int *total_len)
 499 {
 500         char *pneg_ctxt;
 501         unsigned int ctxt_len;
 502
 503         if (*total_len > 200) {
 504                 /* In case length corrupted don't want to overrun smb buffer */
 505                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 506                 return;
 507         }
 508
 509         /*
 510          * round up total_len of fixed part of SMB3 negotiate request to 8
 511          * byte boundary before adding negotiate contexts
 512          */
 513         *total_len = roundup(*total_len, 8);
 514
 515         pneg_ctxt = (*total_len) + (char *)req;
 516         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 517
 518         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 519         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 520         *total_len += ctxt_len;
 521         pneg_ctxt += ctxt_len;
 522
 523         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 524         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 525         *total_len += ctxt_len;
 526         pneg_ctxt += ctxt_len;
 527
 528         if (server->compress_algorithm) {
 529                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 530                                 pneg_ctxt);
 531                 ctxt_len = DIV_ROUND_UP(
 532                         sizeof(struct smb2_compression_capabilities_context),
 533                                 8) * 8;
 534                 *total_len += ctxt_len;
 535                 pneg_ctxt += ctxt_len;
 536                 req->NegotiateContextCount = cpu_to_le16(5);
 537         } else
 538                 req->NegotiateContextCount = cpu_to_le16(4);
 539
 540         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 541                                         server->hostname);
 542         *total_len += ctxt_len;
 543         pneg_ctxt += ctxt_len;
 544
 545         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 546         *total_len += sizeof(struct smb2_posix_neg_context);
 547 }
 548
 549 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 550 {
 551         unsigned int len = le16_to_cpu(ctxt->DataLength);
 552
 553         /* If invalid preauth context warn but use what we requested, SHA-512 */
 554         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 555                 pr_warn_once("server sent bad preauth context\n");
 556                 return;
 557         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 558                 pr_warn_once("server sent invalid SaltLength\n");
 559                 return;
 560         }
 561         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 562                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 563         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 564                 pr_warn_once("unknown SMB3 hash algorithm\n");
 565 }
 566
 567 static void decode_compress_ctx(struct TCP_Server_Info *server,
 568                          struct smb2_compression_capabilities_context *ctxt)
 569 {
 570         unsigned int len = le16_to_cpu(ctxt->DataLength);
 571
 572         /* sizeof compress context is a one element compression capbility struct */
 573         if (len < 10) {
 574                 pr_warn_once("server sent bad compression cntxt\n");
 575                 return;
 576         }
 577         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 578                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 579                 return;
 580         }
 581         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 582                 pr_warn_once("unknown compression algorithm\n");
 583                 return;
 584         }
 585         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 586 }
 587
 588 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 589                               struct smb2_encryption_neg_context *ctxt)
 590 {
 591         unsigned int len = le16_to_cpu(ctxt->DataLength);
 592
 593         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 594         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 595                 pr_warn_once("server sent bad crypto ctxt len\n");
 596                 return -EINVAL;
 597         }
 598
 599         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 600                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 601                 return -EINVAL;
 602         }
 603         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 604         if (require_gcm_256) {
 605                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 606                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 607                         return -EOPNOTSUPP;
 608                 }
 609         } else if (ctxt->Ciphers[0] == 0) {
 610                 /*
 611                  * e.g. if server only supported AES256_CCM (very unlikely)
 612                  * or server supported no encryption types or had all disabled.
 613                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 614                  * in which mount requested encryption ("seal") checks later
 615                  * on during tree connection will return proper rc, but if
 616                  * seal not requested by client, since server is allowed to
 617                  * return 0 to indicate no supported cipher, we can't fail here
 618                  */
 619                 server->cipher_type = 0;
 620                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 621                 pr_warn_once("Server does not support requested encryption types\n");
 622                 return 0;
 623         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 624                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 625                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 626                 /* server returned a cipher we didn't ask for */
 627                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 628                 return -EINVAL;
 629         }
 630         server->cipher_type = ctxt->Ciphers[0];
 631         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 632         return 0;
 633 }
 634
 635 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 636                                      struct TCP_Server_Info *server,
 637                                      unsigned int len_of_smb)
 638 {
 639         struct smb2_neg_context *pctx;
 640         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 641         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 642         unsigned int len_of_ctxts, i;
 643         int rc = 0;
 644
 645         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 646         if (len_of_smb <= offset) {
 647                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 648                 return -EINVAL;
 649         }
 650
 651         len_of_ctxts = len_of_smb - offset;
 652
 653         for (i = 0; i < ctxt_cnt; i++) {
 654                 int clen;
 655                 /* check that offset is not beyond end of SMB */
 656                 if (len_of_ctxts == 0)
 657                         break;
 658
 659                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 660                         break;
 661
 662                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 663                 clen = le16_to_cpu(pctx->DataLength);
 664                 if (clen > len_of_ctxts)
 665                         break;
 666
 667                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 668                         decode_preauth_context(
 669                                 (struct smb2_preauth_neg_context *)pctx);
 670                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 671                         rc = decode_encrypt_ctx(server,
 672                                 (struct smb2_encryption_neg_context *)pctx);
 673                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 674                         decode_compress_ctx(server,
 675                                 (struct smb2_compression_capabilities_context *)pctx);
 676                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 677                         server->posix_ext_supported = true;
 678                 else
 679                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 680                                 le16_to_cpu(pctx->ContextType));
 681
 682                 if (rc)
 683                         break;
 684                 /* offsets must be 8 byte aligned */
 685                 clen = (clen + 7) & ~0x7;
 686                 offset += clen + sizeof(struct smb2_neg_context);
 687                 len_of_ctxts -= clen;
 688         }
 689         return rc;
 690 }
 691
 692 static struct create_posix *
 693 create_posix_buf(umode_t mode)
 694 {
 695         struct create_posix *buf;
 696
 697         buf = kzalloc(sizeof(struct create_posix),
 698                         GFP_KERNEL);
 699         if (!buf)
 700                 return NULL;
 701
 702         buf->ccontext.DataOffset =
 703                 cpu_to_le16(offsetof(struct create_posix, Mode));
 704         buf->ccontext.DataLength = cpu_to_le32(4);
 705         buf->ccontext.NameOffset =
 706                 cpu_to_le16(offsetof(struct create_posix, Name));
 707         buf->ccontext.NameLength = cpu_to_le16(16);
 708
 709         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 710         buf->Name[0] = 0x93;
 711         buf->Name[1] = 0xAD;
 712         buf->Name[2] = 0x25;
 713         buf->Name[3] = 0x50;
 714         buf->Name[4] = 0x9C;
 715         buf->Name[5] = 0xB4;
 716         buf->Name[6] = 0x11;
 717         buf->Name[7] = 0xE7;
 718         buf->Name[8] = 0xB4;
 719         buf->Name[9] = 0x23;
 720         buf->Name[10] = 0x83;
 721         buf->Name[11] = 0xDE;
 722         buf->Name[12] = 0x96;
 723         buf->Name[13] = 0x8B;
 724         buf->Name[14] = 0xCD;
 725         buf->Name[15] = 0x7C;
 726         buf->Mode = cpu_to_le32(mode);
 727         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 728         return buf;
 729 }
 730
 731 static int
 732 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 733 {
 734         struct smb2_create_req *req = iov[0].iov_base;
 735         unsigned int num = *num_iovec;
 736
 737         iov[num].iov_base = create_posix_buf(mode);
 738         if (mode == ACL_NO_MODE)
 739                 cifs_dbg(FYI, "Invalid mode\n");
 740         if (iov[num].iov_base == NULL)
 741                 return -ENOMEM;
 742         iov[num].iov_len = sizeof(struct create_posix);
 743         if (!req->CreateContextsOffset)
 744                 req->CreateContextsOffset = cpu_to_le32(
 745                                 sizeof(struct smb2_create_req) +
 746                                 iov[num - 1].iov_len);
 747         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 748         *num_iovec = num + 1;
 749         return 0;
 750 }
 751
 752
 753 /*
 754  *
 755  *      SMB2 Worker functions follow:
 756  *
 757  *      The general structure of the worker functions is:
 758  *      1) Call smb2_init (assembles SMB2 header)
 759  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 760  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 761  *      4) Decode SMB2 command specific fields in the fixed length area
 762  *      5) Decode variable length data area (if any for this SMB2 command type)
 763  *      6) Call free smb buffer
 764  *      7) return
 765  *
 766  */
 767
 768 int
 769 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 770 {
 771         struct smb_rqst rqst;
 772         struct smb2_negotiate_req *req;
 773         struct smb2_negotiate_rsp *rsp;
 774         struct kvec iov[1];
 775         struct kvec rsp_iov;
 776         int rc = 0;
 777         int resp_buftype;
 778         struct TCP_Server_Info *server = cifs_ses_server(ses);
 779         int blob_offset, blob_length;
 780         char *security_blob;
 781         int flags = CIFS_NEG_OP;
 782         unsigned int total_len;
 783
 784         cifs_dbg(FYI, "Negotiate protocol\n");
 785
 786         if (!server) {
 787                 WARN(1, "%s: server is NULL!\n", __func__);
 788                 return -EIO;
 789         }
 790
 791         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 792                                  (void **) &req, &total_len);
 793         if (rc)
 794                 return rc;
 795
 796         req->sync_hdr.SessionId = 0;
 797
 798         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 799         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 800
 801         if (strcmp(server->vals->version_string,
 802                    SMB3ANY_VERSION_STRING) == 0) {
 803                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 804                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 805                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 806                 req->DialectCount = cpu_to_le16(3);
 807                 total_len += 6;
 808         } else if (strcmp(server->vals->version_string,
 809                    SMBDEFAULT_VERSION_STRING) == 0) {
 810                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 811                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 812                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 813                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 814                 req->DialectCount = cpu_to_le16(4);
 815                 total_len += 8;
 816         } else {
 817                 /* otherwise send specific dialect */
 818                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 819                 req->DialectCount = cpu_to_le16(1);
 820                 total_len += 2;
 821         }
 822
 823         /* only one of SMB2 signing flags may be set in SMB2 request */
 824         if (ses->sign)
 825                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 826         else if (global_secflags & CIFSSEC_MAY_SIGN)
 827                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 828         else
 829                 req->SecurityMode = 0;
 830
 831         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 832         if (ses->chan_max > 1)
 833                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 834
 835         /* ClientGUID must be zero for SMB2.02 dialect */
 836         if (server->vals->protocol_id == SMB20_PROT_ID)
 837                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 838         else {
 839                 memcpy(req->ClientGUID, server->client_guid,
 840                         SMB2_CLIENT_GUID_SIZE);
 841                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 842                     (strcmp(server->vals->version_string,
 843                      SMB3ANY_VERSION_STRING) == 0) ||
 844                     (strcmp(server->vals->version_string,
 845                      SMBDEFAULT_VERSION_STRING) == 0))
 846                         assemble_neg_contexts(req, server, &total_len);
 847         }
 848         iov[0].iov_base = (char *)req;
 849         iov[0].iov_len = total_len;
 850
 851         memset(&rqst, 0, sizeof(struct smb_rqst));
 852         rqst.rq_iov = iov;
 853         rqst.rq_nvec = 1;
 854
 855         rc = cifs_send_recv(xid, ses, server,
 856                             &rqst, &resp_buftype, flags, &rsp_iov);
 857         cifs_small_buf_release(req);
 858         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 859         /*
 860          * No tcon so can't do
 861          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 862          */
 863         if (rc == -EOPNOTSUPP) {
 864                 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");
 865                 goto neg_exit;
 866         } else if (rc != 0)
 867                 goto neg_exit;
 868
 869         if (strcmp(server->vals->version_string,
 870                    SMB3ANY_VERSION_STRING) == 0) {
 871                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 872                         cifs_server_dbg(VFS,
 873                                 "SMB2 dialect returned but not requested\n");
 874                         return -EIO;
 875                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 876                         cifs_server_dbg(VFS,
 877                                 "SMB2.1 dialect returned but not requested\n");
 878                         return -EIO;
 879                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 880                         /* ops set to 3.0 by default for default so update */
 881                         server->ops = &smb311_operations;
 882                         server->vals = &smb311_values;
 883                 }
 884         } else if (strcmp(server->vals->version_string,
 885                    SMBDEFAULT_VERSION_STRING) == 0) {
 886                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 887                         cifs_server_dbg(VFS,
 888                                 "SMB2 dialect returned but not requested\n");
 889                         return -EIO;
 890                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 891                         /* ops set to 3.0 by default for default so update */
 892                         server->ops = &smb21_operations;
 893                         server->vals = &smb21_values;
 894                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 895                         server->ops = &smb311_operations;
 896                         server->vals = &smb311_values;
 897                 }
 898         } else if (le16_to_cpu(rsp->DialectRevision) !=
 899                                 server->vals->protocol_id) {
 900                 /* if requested single dialect ensure returned dialect matched */
 901                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 902                                 le16_to_cpu(rsp->DialectRevision));
 903                 return -EIO;
 904         }
 905
 906         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 907
 908         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 909                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 910         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 911                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 912         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 913                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 914         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 915                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 916         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 917                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 918         else {
 919                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 920                                 le16_to_cpu(rsp->DialectRevision));
 921                 rc = -EIO;
 922                 goto neg_exit;
 923         }
 924         server->dialect = le16_to_cpu(rsp->DialectRevision);
 925
 926         /*
 927          * Keep a copy of the hash after negprot. This hash will be
 928          * the starting hash value for all sessions made from this
 929          * server.
 930          */
 931         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 932                SMB2_PREAUTH_HASH_SIZE);
 933
 934         /* SMB2 only has an extended negflavor */
 935         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 936         /* set it to the maximum buffer size value we can send with 1 credit */
 937         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 938                                SMB2_MAX_BUFFER_SIZE);
 939         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 940         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 941         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 942         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 943                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 944                                 server->sec_mode);
 945         server->capabilities = le32_to_cpu(rsp->Capabilities);
 946         /* Internal types */
 947         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 948
 949         /*
 950          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
 951          * Set the cipher type manually.
 952          */
 953         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 954                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
 955
 956         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 957                                                (struct smb2_sync_hdr *)rsp);
 958         /*
 959          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 960          * for us will be
 961          *      ses->sectype = RawNTLMSSP;
 962          * but for time being this is our only auth choice so doesn't matter.
 963          * We just found a server which sets blob length to zero expecting raw.
 964          */
 965         if (blob_length == 0) {
 966                 cifs_dbg(FYI, "missing security blob on negprot\n");
 967                 server->sec_ntlmssp = true;
 968         }
 969
 970         rc = cifs_enable_signing(server, ses->sign);
 971         if (rc)
 972                 goto neg_exit;
 973         if (blob_length) {
 974                 rc = decode_negTokenInit(security_blob, blob_length, server);
 975                 if (rc == 1)
 976                         rc = 0;
 977                 else if (rc == 0)
 978                         rc = -EIO;
 979         }
 980
 981         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 982                 if (rsp->NegotiateContextCount)
 983                         rc = smb311_decode_neg_context(rsp, server,
 984                                                        rsp_iov.iov_len);
 985                 else
 986                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 987         }
 988 neg_exit:
 989         free_rsp_buf(resp_buftype, rsp);
 990         return rc;
 991 }
 992
 993 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 994 {
 995         int rc;
 996         struct validate_negotiate_info_req *pneg_inbuf;
 997         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 998         u32 rsplen;
 999         u32 inbuflen; /* max of 4 dialects */
1000         struct TCP_Server_Info *server = tcon->ses->server;
1001
1002         cifs_dbg(FYI, "validate negotiate\n");
1003
1004         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1005         if (server->dialect == SMB311_PROT_ID)
1006                 return 0;
1007
1008         /*
1009          * validation ioctl must be signed, so no point sending this if we
1010          * can not sign it (ie are not known user).  Even if signing is not
1011          * required (enabled but not negotiated), in those cases we selectively
1012          * sign just this, the first and only signed request on a connection.
1013          * Having validation of negotiate info  helps reduce attack vectors.
1014          */
1015         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1016                 return 0; /* validation requires signing */
1017
1018         if (tcon->ses->user_name == NULL) {
1019                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1020                 return 0; /* validation requires signing */
1021         }
1022
1023         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1024                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1025
1026         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1027         if (!pneg_inbuf)
1028                 return -ENOMEM;
1029
1030         pneg_inbuf->Capabilities =
1031                         cpu_to_le32(server->vals->req_capabilities);
1032         if (tcon->ses->chan_max > 1)
1033                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1034
1035         memcpy(pneg_inbuf->Guid, server->client_guid,
1036                                         SMB2_CLIENT_GUID_SIZE);
1037
1038         if (tcon->ses->sign)
1039                 pneg_inbuf->SecurityMode =
1040                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1041         else if (global_secflags & CIFSSEC_MAY_SIGN)
1042                 pneg_inbuf->SecurityMode =
1043                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1044         else
1045                 pneg_inbuf->SecurityMode = 0;
1046
1047
1048         if (strcmp(server->vals->version_string,
1049                 SMB3ANY_VERSION_STRING) == 0) {
1050                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1051                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1052                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1053                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1054                 /* SMB 2.1 not included so subtract one dialect from len */
1055                 inbuflen = sizeof(*pneg_inbuf) -
1056                                 (sizeof(pneg_inbuf->Dialects[0]));
1057         } else if (strcmp(server->vals->version_string,
1058                 SMBDEFAULT_VERSION_STRING) == 0) {
1059                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1060                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1061                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1062                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1063                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1064                 /* structure is big enough for 4 dialects */
1065                 inbuflen = sizeof(*pneg_inbuf);
1066         } else {
1067                 /* otherwise specific dialect was requested */
1068                 pneg_inbuf->Dialects[0] =
1069                         cpu_to_le16(server->vals->protocol_id);
1070                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1071                 /* structure is big enough for 3 dialects, sending only 1 */
1072                 inbuflen = sizeof(*pneg_inbuf) -
1073                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1074         }
1075
1076         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1077                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1078                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1079                 (char **)&pneg_rsp, &rsplen);
1080         if (rc == -EOPNOTSUPP) {
1081                 /*
1082                  * Old Windows versions or Netapp SMB server can return
1083                  * not supported error. Client should accept it.
1084                  */
1085                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1086                 rc = 0;
1087                 goto out_free_inbuf;
1088         } else if (rc != 0) {
1089                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1090                               rc);
1091                 rc = -EIO;
1092                 goto out_free_inbuf;
1093         }
1094
1095         rc = -EIO;
1096         if (rsplen != sizeof(*pneg_rsp)) {
1097                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1098                               rsplen);
1099
1100                 /* relax check since Mac returns max bufsize allowed on ioctl */
1101                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1102                         goto out_free_rsp;
1103         }
1104
1105         /* check validate negotiate info response matches what we got earlier */
1106         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1107                 goto vneg_out;
1108
1109         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1110                 goto vneg_out;
1111
1112         /* do not validate server guid because not saved at negprot time yet */
1113
1114         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1115               SMB2_LARGE_FILES) != server->capabilities)
1116                 goto vneg_out;
1117
1118         /* validate negotiate successful */
1119         rc = 0;
1120         cifs_dbg(FYI, "validate negotiate info successful\n");
1121         goto out_free_rsp;
1122
1123 vneg_out:
1124         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1125 out_free_rsp:
1126         kfree(pneg_rsp);
1127 out_free_inbuf:
1128         kfree(pneg_inbuf);
1129         return rc;
1130 }
1131
1132 enum securityEnum
1133 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1134 {
1135         switch (requested) {
1136         case Kerberos:
1137         case RawNTLMSSP:
1138                 return requested;
1139         case NTLMv2:
1140                 return RawNTLMSSP;
1141         case Unspecified:
1142                 if (server->sec_ntlmssp &&
1143                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1144                         return RawNTLMSSP;
1145                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1146                         (global_secflags & CIFSSEC_MAY_KRB5))
1147                         return Kerberos;
1148                 fallthrough;
1149         default:
1150                 return Unspecified;
1151         }
1152 }
1153
1154 struct SMB2_sess_data {
1155         unsigned int xid;
1156         struct cifs_ses *ses;
1157         struct nls_table *nls_cp;
1158         void (*func)(struct SMB2_sess_data *);
1159         int result;
1160         u64 previous_session;
1161
1162         /* we will send the SMB in three pieces:
1163          * a fixed length beginning part, an optional
1164          * SPNEGO blob (which can be zero length), and a
1165          * last part which will include the strings
1166          * and rest of bcc area. This allows us to avoid
1167          * a large buffer 17K allocation
1168          */
1169         int buf0_type;
1170         struct kvec iov[2];
1171 };
1172
1173 static int
1174 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1175 {
1176         int rc;
1177         struct cifs_ses *ses = sess_data->ses;
1178         struct smb2_sess_setup_req *req;
1179         struct TCP_Server_Info *server = cifs_ses_server(ses);
1180         unsigned int total_len;
1181
1182         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1183                                  (void **) &req,
1184                                  &total_len);
1185         if (rc)
1186                 return rc;
1187
1188         if (sess_data->ses->binding) {
1189                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1190                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1191                 req->PreviousSessionId = 0;
1192                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1193         } else {
1194                 /* First session, not a reauthenticate */
1195                 req->sync_hdr.SessionId = 0;
1196                 /*
1197                  * if reconnect, we need to send previous sess id
1198                  * otherwise it is 0
1199                  */
1200                 req->PreviousSessionId = sess_data->previous_session;
1201                 req->Flags = 0; /* MBZ */
1202         }
1203
1204         /* enough to enable echos and oplocks and one max size write */
1205         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1206
1207         /* only one of SMB2 signing flags may be set in SMB2 request */
1208         if (server->sign)
1209                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1210         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1211                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1212         else
1213                 req->SecurityMode = 0;
1214
1215 #ifdef CONFIG_CIFS_DFS_UPCALL
1216         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1217 #else
1218         req->Capabilities = 0;
1219 #endif /* DFS_UPCALL */
1220
1221         req->Channel = 0; /* MBZ */
1222
1223         sess_data->iov[0].iov_base = (char *)req;
1224         /* 1 for pad */
1225         sess_data->iov[0].iov_len = total_len - 1;
1226         /*
1227          * This variable will be used to clear the buffer
1228          * allocated above in case of any error in the calling function.
1229          */
1230         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1231
1232         return 0;
1233 }
1234
1235 static void
1236 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1237 {
1238         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1239         sess_data->buf0_type = CIFS_NO_BUFFER;
1240 }
1241
1242 static int
1243 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1244 {
1245         int rc;
1246         struct smb_rqst rqst;
1247         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1248         struct kvec rsp_iov = { NULL, 0 };
1249
1250         /* Testing shows that buffer offset must be at location of Buffer[0] */
1251         req->SecurityBufferOffset =
1252                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1253         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1254
1255         memset(&rqst, 0, sizeof(struct smb_rqst));
1256         rqst.rq_iov = sess_data->iov;
1257         rqst.rq_nvec = 2;
1258
1259         /* BB add code to build os and lm fields */
1260         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1261                             cifs_ses_server(sess_data->ses),
1262                             &rqst,
1263                             &sess_data->buf0_type,
1264                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1265         cifs_small_buf_release(sess_data->iov[0].iov_base);
1266         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1267
1268         return rc;
1269 }
1270
1271 static int
1272 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1273 {
1274         int rc = 0;
1275         struct cifs_ses *ses = sess_data->ses;
1276         struct TCP_Server_Info *server = cifs_ses_server(ses);
1277
1278         mutex_lock(&server->srv_mutex);
1279         if (server->ops->generate_signingkey) {
1280                 rc = server->ops->generate_signingkey(ses);
1281                 if (rc) {
1282                         cifs_dbg(FYI,
1283                                 "SMB3 session key generation failed\n");
1284                         mutex_unlock(&server->srv_mutex);
1285                         return rc;
1286                 }
1287         }
1288         if (!server->session_estab) {
1289                 server->sequence_number = 0x2;
1290                 server->session_estab = true;
1291         }
1292         mutex_unlock(&server->srv_mutex);
1293
1294         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1295         /* keep existing ses state if binding */
1296         if (!ses->binding) {
1297                 spin_lock(&GlobalMid_Lock);
1298                 ses->status = CifsGood;
1299                 ses->need_reconnect = false;
1300                 spin_unlock(&GlobalMid_Lock);
1301         }
1302
1303         return rc;
1304 }
1305
1306 #ifdef CONFIG_CIFS_UPCALL
1307 static void
1308 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1309 {
1310         int rc;
1311         struct cifs_ses *ses = sess_data->ses;
1312         struct cifs_spnego_msg *msg;
1313         struct key *spnego_key = NULL;
1314         struct smb2_sess_setup_rsp *rsp = NULL;
1315
1316         rc = SMB2_sess_alloc_buffer(sess_data);
1317         if (rc)
1318                 goto out;
1319
1320         spnego_key = cifs_get_spnego_key(ses);
1321         if (IS_ERR(spnego_key)) {
1322                 rc = PTR_ERR(spnego_key);
1323                 if (rc == -ENOKEY)
1324                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1325                 spnego_key = NULL;
1326                 goto out;
1327         }
1328
1329         msg = spnego_key->payload.data[0];
1330         /*
1331          * check version field to make sure that cifs.upcall is
1332          * sending us a response in an expected form
1333          */
1334         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1335                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1336                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1337                 rc = -EKEYREJECTED;
1338                 goto out_put_spnego_key;
1339         }
1340
1341         /* keep session key if binding */
1342         if (!ses->binding) {
1343                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1344                                                  GFP_KERNEL);
1345                 if (!ses->auth_key.response) {
1346                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1347                                  msg->sesskey_len);
1348                         rc = -ENOMEM;
1349                         goto out_put_spnego_key;
1350                 }
1351                 ses->auth_key.len = msg->sesskey_len;
1352         }
1353
1354         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1355         sess_data->iov[1].iov_len = msg->secblob_len;
1356
1357         rc = SMB2_sess_sendreceive(sess_data);
1358         if (rc)
1359                 goto out_put_spnego_key;
1360
1361         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1362         /* keep session id and flags if binding */
1363         if (!ses->binding) {
1364                 ses->Suid = rsp->sync_hdr.SessionId;
1365                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1366         }
1367
1368         rc = SMB2_sess_establish_session(sess_data);
1369 out_put_spnego_key:
1370         key_invalidate(spnego_key);
1371         key_put(spnego_key);
1372 out:
1373         sess_data->result = rc;
1374         sess_data->func = NULL;
1375         SMB2_sess_free_buffer(sess_data);
1376 }
1377 #else
1378 static void
1379 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1380 {
1381         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1382         sess_data->result = -EOPNOTSUPP;
1383         sess_data->func = NULL;
1384 }
1385 #endif
1386
1387 static void
1388 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1389
1390 static void
1391 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1392 {
1393         int rc;
1394         struct cifs_ses *ses = sess_data->ses;
1395         struct smb2_sess_setup_rsp *rsp = NULL;
1396         char *ntlmssp_blob = NULL;
1397         bool use_spnego = false; /* else use raw ntlmssp */
1398         u16 blob_length = 0;
1399
1400         /*
1401          * If memory allocation is successful, caller of this function
1402          * frees it.
1403          */
1404         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1405         if (!ses->ntlmssp) {
1406                 rc = -ENOMEM;
1407                 goto out_err;
1408         }
1409         ses->ntlmssp->sesskey_per_smbsess = true;
1410
1411         rc = SMB2_sess_alloc_buffer(sess_data);
1412         if (rc)
1413                 goto out_err;
1414
1415         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1416                                GFP_KERNEL);
1417         if (ntlmssp_blob == NULL) {
1418                 rc = -ENOMEM;
1419                 goto out;
1420         }
1421
1422         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1423         if (use_spnego) {
1424                 /* BB eventually need to add this */
1425                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1426                 rc = -EOPNOTSUPP;
1427                 goto out;
1428         } else {
1429                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1430                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1431         }
1432         sess_data->iov[1].iov_base = ntlmssp_blob;
1433         sess_data->iov[1].iov_len = blob_length;
1434
1435         rc = SMB2_sess_sendreceive(sess_data);
1436         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1437
1438         /* If true, rc here is expected and not an error */
1439         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1440                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1441                 rc = 0;
1442
1443         if (rc)
1444                 goto out;
1445
1446         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1447                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1448                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1449                         le16_to_cpu(rsp->SecurityBufferOffset));
1450                 rc = -EIO;
1451                 goto out;
1452         }
1453         rc = decode_ntlmssp_challenge(rsp->Buffer,
1454                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1455         if (rc)
1456                 goto out;
1457
1458         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1459
1460         /* keep existing ses id and flags if binding */
1461         if (!ses->binding) {
1462                 ses->Suid = rsp->sync_hdr.SessionId;
1463                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1464         }
1465
1466 out:
1467         kfree(ntlmssp_blob);
1468         SMB2_sess_free_buffer(sess_data);
1469         if (!rc) {
1470                 sess_data->result = 0;
1471                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1472                 return;
1473         }
1474 out_err:
1475         kfree(ses->ntlmssp);
1476         ses->ntlmssp = NULL;
1477         sess_data->result = rc;
1478         sess_data->func = NULL;
1479 }
1480
1481 static void
1482 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1483 {
1484         int rc;
1485         struct cifs_ses *ses = sess_data->ses;
1486         struct smb2_sess_setup_req *req;
1487         struct smb2_sess_setup_rsp *rsp = NULL;
1488         unsigned char *ntlmssp_blob = NULL;
1489         bool use_spnego = false; /* else use raw ntlmssp */
1490         u16 blob_length = 0;
1491
1492         rc = SMB2_sess_alloc_buffer(sess_data);
1493         if (rc)
1494                 goto out;
1495
1496         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1497         req->sync_hdr.SessionId = ses->Suid;
1498
1499         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1500                                         sess_data->nls_cp);
1501         if (rc) {
1502                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1503                 goto out;
1504         }
1505
1506         if (use_spnego) {
1507                 /* BB eventually need to add this */
1508                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1509                 rc = -EOPNOTSUPP;
1510                 goto out;
1511         }
1512         sess_data->iov[1].iov_base = ntlmssp_blob;
1513         sess_data->iov[1].iov_len = blob_length;
1514
1515         rc = SMB2_sess_sendreceive(sess_data);
1516         if (rc)
1517                 goto out;
1518
1519         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1520
1521         /* keep existing ses id and flags if binding */
1522         if (!ses->binding) {
1523                 ses->Suid = rsp->sync_hdr.SessionId;
1524                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1525         }
1526
1527         rc = SMB2_sess_establish_session(sess_data);
1528 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1529         if (ses->server->dialect < SMB30_PROT_ID) {
1530                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1531                 /*
1532                  * The session id is opaque in terms of endianness, so we can't
1533                  * print it as a long long. we dump it as we got it on the wire
1534                  */
1535                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1536                          &ses->Suid);
1537                 cifs_dbg(VFS, "Session Key   %*ph\n",
1538                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1539                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1540                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1541         }
1542 #endif
1543 out:
1544         kfree(ntlmssp_blob);
1545         SMB2_sess_free_buffer(sess_data);
1546         kfree(ses->ntlmssp);
1547         ses->ntlmssp = NULL;
1548         sess_data->result = rc;
1549         sess_data->func = NULL;
1550 }
1551
1552 static int
1553 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1554 {
1555         int type;
1556
1557         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1558         cifs_dbg(FYI, "sess setup type %d\n", type);
1559         if (type == Unspecified) {
1560                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1561                 return -EINVAL;
1562         }
1563
1564         switch (type) {
1565         case Kerberos:
1566                 sess_data->func = SMB2_auth_kerberos;
1567                 break;
1568         case RawNTLMSSP:
1569                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1570                 break;
1571         default:
1572                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1573                 return -EOPNOTSUPP;
1574         }
1575
1576         return 0;
1577 }
1578
1579 int
1580 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1581                 const struct nls_table *nls_cp)
1582 {
1583         int rc = 0;
1584         struct TCP_Server_Info *server = cifs_ses_server(ses);
1585         struct SMB2_sess_data *sess_data;
1586
1587         cifs_dbg(FYI, "Session Setup\n");
1588
1589         if (!server) {
1590                 WARN(1, "%s: server is NULL!\n", __func__);
1591                 return -EIO;
1592         }
1593
1594         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1595         if (!sess_data)
1596                 return -ENOMEM;
1597
1598         rc = SMB2_select_sec(ses, sess_data);
1599         if (rc)
1600                 goto out;
1601         sess_data->xid = xid;
1602         sess_data->ses = ses;
1603         sess_data->buf0_type = CIFS_NO_BUFFER;
1604         sess_data->nls_cp = (struct nls_table *) nls_cp;
1605         sess_data->previous_session = ses->Suid;
1606
1607         /*
1608          * Initialize the session hash with the server one.
1609          */
1610         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1611                SMB2_PREAUTH_HASH_SIZE);
1612
1613         while (sess_data->func)
1614                 sess_data->func(sess_data);
1615
1616         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1617                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1618         rc = sess_data->result;
1619 out:
1620         kfree(sess_data);
1621         return rc;
1622 }
1623
1624 int
1625 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1626 {
1627         struct smb_rqst rqst;
1628         struct smb2_logoff_req *req; /* response is also trivial struct */
1629         int rc = 0;
1630         struct TCP_Server_Info *server;
1631         int flags = 0;
1632         unsigned int total_len;
1633         struct kvec iov[1];
1634         struct kvec rsp_iov;
1635         int resp_buf_type;
1636
1637         cifs_dbg(FYI, "disconnect session %p\n", ses);
1638
1639         if (ses && (ses->server))
1640                 server = ses->server;
1641         else
1642                 return -EIO;
1643
1644         /* no need to send SMB logoff if uid already closed due to reconnect */
1645         if (ses->need_reconnect)
1646                 goto smb2_session_already_dead;
1647
1648         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1649                                  (void **) &req, &total_len);
1650         if (rc)
1651                 return rc;
1652
1653          /* since no tcon, smb2_init can not do this, so do here */
1654         req->sync_hdr.SessionId = ses->Suid;
1655
1656         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1657                 flags |= CIFS_TRANSFORM_REQ;
1658         else if (server->sign)
1659                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1660
1661         flags |= CIFS_NO_RSP_BUF;
1662
1663         iov[0].iov_base = (char *)req;
1664         iov[0].iov_len = total_len;
1665
1666         memset(&rqst, 0, sizeof(struct smb_rqst));
1667         rqst.rq_iov = iov;
1668         rqst.rq_nvec = 1;
1669
1670         rc = cifs_send_recv(xid, ses, ses->server,
1671                             &rqst, &resp_buf_type, flags, &rsp_iov);
1672         cifs_small_buf_release(req);
1673         /*
1674          * No tcon so can't do
1675          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1676          */
1677
1678 smb2_session_already_dead:
1679         return rc;
1680 }
1681
1682 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1683 {
1684         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1685 }
1686
1687 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1688
1689 /* These are similar values to what Windows uses */
1690 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1691 {
1692         tcon->max_chunks = 256;
1693         tcon->max_bytes_chunk = 1048576;
1694         tcon->max_bytes_copy = 16777216;
1695 }
1696
1697 int
1698 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1699           struct cifs_tcon *tcon, const struct nls_table *cp)
1700 {
1701         struct smb_rqst rqst;
1702         struct smb2_tree_connect_req *req;
1703         struct smb2_tree_connect_rsp *rsp = NULL;
1704         struct kvec iov[2];
1705         struct kvec rsp_iov = { NULL, 0 };
1706         int rc = 0;
1707         int resp_buftype;
1708         int unc_path_len;
1709         __le16 *unc_path = NULL;
1710         int flags = 0;
1711         unsigned int total_len;
1712         struct TCP_Server_Info *server;
1713
1714         /* always use master channel */
1715         server = ses->server;
1716
1717         cifs_dbg(FYI, "TCON\n");
1718
1719         if (!server || !tree)
1720                 return -EIO;
1721
1722         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1723         if (unc_path == NULL)
1724                 return -ENOMEM;
1725
1726         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1727         unc_path_len *= 2;
1728         if (unc_path_len < 2) {
1729                 kfree(unc_path);
1730                 return -EINVAL;
1731         }
1732
1733         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1734         tcon->tid = 0;
1735         atomic_set(&tcon->num_remote_opens, 0);
1736         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1737                                  (void **) &req, &total_len);
1738         if (rc) {
1739                 kfree(unc_path);
1740                 return rc;
1741         }
1742
1743         if (smb3_encryption_required(tcon))
1744                 flags |= CIFS_TRANSFORM_REQ;
1745
1746         iov[0].iov_base = (char *)req;
1747         /* 1 for pad */
1748         iov[0].iov_len = total_len - 1;
1749
1750         /* Testing shows that buffer offset must be at location of Buffer[0] */
1751         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1752                         - 1 /* pad */);
1753         req->PathLength = cpu_to_le16(unc_path_len - 2);
1754         iov[1].iov_base = unc_path;
1755         iov[1].iov_len = unc_path_len;
1756
1757         /*
1758          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1759          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1760          * (Samba servers don't always set the flag so also check if null user)
1761          */
1762         if ((server->dialect == SMB311_PROT_ID) &&
1763             !smb3_encryption_required(tcon) &&
1764             !(ses->session_flags &
1765                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1766             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1767                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1768
1769         memset(&rqst, 0, sizeof(struct smb_rqst));
1770         rqst.rq_iov = iov;
1771         rqst.rq_nvec = 2;
1772
1773         /* Need 64 for max size write so ask for more in case not there yet */
1774         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1775
1776         rc = cifs_send_recv(xid, ses, server,
1777                             &rqst, &resp_buftype, flags, &rsp_iov);
1778         cifs_small_buf_release(req);
1779         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1780         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1781         if (rc != 0) {
1782                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1783                 tcon->need_reconnect = true;
1784                 goto tcon_error_exit;
1785         }
1786
1787         switch (rsp->ShareType) {
1788         case SMB2_SHARE_TYPE_DISK:
1789                 cifs_dbg(FYI, "connection to disk share\n");
1790                 break;
1791         case SMB2_SHARE_TYPE_PIPE:
1792                 tcon->pipe = true;
1793                 cifs_dbg(FYI, "connection to pipe share\n");
1794                 break;
1795         case SMB2_SHARE_TYPE_PRINT:
1796                 tcon->print = true;
1797                 cifs_dbg(FYI, "connection to printer\n");
1798                 break;
1799         default:
1800                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1801                 rc = -EOPNOTSUPP;
1802                 goto tcon_error_exit;
1803         }
1804
1805         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1806         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1807         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1808         tcon->tidStatus = CifsGood;
1809         tcon->need_reconnect = false;
1810         tcon->tid = rsp->sync_hdr.TreeId;
1811         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1812
1813         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1814             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1815                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1816
1817         if (tcon->seal &&
1818             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1819                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1820
1821         init_copy_chunk_defaults(tcon);
1822         if (server->ops->validate_negotiate)
1823                 rc = server->ops->validate_negotiate(xid, tcon);
1824 tcon_exit:
1825
1826         free_rsp_buf(resp_buftype, rsp);
1827         kfree(unc_path);
1828         return rc;
1829
1830 tcon_error_exit:
1831         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1832                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1833         }
1834         goto tcon_exit;
1835 }
1836
1837 int
1838 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1839 {
1840         struct smb_rqst rqst;
1841         struct smb2_tree_disconnect_req *req; /* response is trivial */
1842         int rc = 0;
1843         struct cifs_ses *ses = tcon->ses;
1844         int flags = 0;
1845         unsigned int total_len;
1846         struct kvec iov[1];
1847         struct kvec rsp_iov;
1848         int resp_buf_type;
1849
1850         cifs_dbg(FYI, "Tree Disconnect\n");
1851
1852         if (!ses || !(ses->server))
1853                 return -EIO;
1854
1855         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1856                 return 0;
1857
1858         close_cached_dir_lease(&tcon->crfid);
1859
1860         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1861                                  (void **) &req,
1862                                  &total_len);
1863         if (rc)
1864                 return rc;
1865
1866         if (smb3_encryption_required(tcon))
1867                 flags |= CIFS_TRANSFORM_REQ;
1868
1869         flags |= CIFS_NO_RSP_BUF;
1870
1871         iov[0].iov_base = (char *)req;
1872         iov[0].iov_len = total_len;
1873
1874         memset(&rqst, 0, sizeof(struct smb_rqst));
1875         rqst.rq_iov = iov;
1876         rqst.rq_nvec = 1;
1877
1878         rc = cifs_send_recv(xid, ses, ses->server,
1879                             &rqst, &resp_buf_type, flags, &rsp_iov);
1880         cifs_small_buf_release(req);
1881         if (rc)
1882                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1883
1884         return rc;
1885 }
1886
1887
1888 static struct create_durable *
1889 create_durable_buf(void)
1890 {
1891         struct create_durable *buf;
1892
1893         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1894         if (!buf)
1895                 return NULL;
1896
1897         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1898                                         (struct create_durable, Data));
1899         buf->ccontext.DataLength = cpu_to_le32(16);
1900         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1901                                 (struct create_durable, Name));
1902         buf->ccontext.NameLength = cpu_to_le16(4);
1903         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1904         buf->Name[0] = 'D';
1905         buf->Name[1] = 'H';
1906         buf->Name[2] = 'n';
1907         buf->Name[3] = 'Q';
1908         return buf;
1909 }
1910
1911 static struct create_durable *
1912 create_reconnect_durable_buf(struct cifs_fid *fid)
1913 {
1914         struct create_durable *buf;
1915
1916         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1917         if (!buf)
1918                 return NULL;
1919
1920         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1921                                         (struct create_durable, Data));
1922         buf->ccontext.DataLength = cpu_to_le32(16);
1923         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1924                                 (struct create_durable, Name));
1925         buf->ccontext.NameLength = cpu_to_le16(4);
1926         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1927         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1928         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1929         buf->Name[0] = 'D';
1930         buf->Name[1] = 'H';
1931         buf->Name[2] = 'n';
1932         buf->Name[3] = 'C';
1933         return buf;
1934 }
1935
1936 static void
1937 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1938 {
1939         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1940
1941         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1942                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1943         buf->IndexNumber = pdisk_id->DiskFileId;
1944 }
1945
1946 static void
1947 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1948                  struct create_posix_rsp *posix)
1949 {
1950         int sid_len;
1951         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1952         u8 *end = beg + le32_to_cpu(cc->DataLength);
1953         u8 *sid;
1954
1955         memset(posix, 0, sizeof(*posix));
1956
1957         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1958         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1959         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1960
1961         sid = beg + 12;
1962         sid_len = posix_info_sid_size(sid, end);
1963         if (sid_len < 0) {
1964                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1965                 return;
1966         }
1967         memcpy(&posix->owner, sid, sid_len);
1968
1969         sid = sid + sid_len;
1970         sid_len = posix_info_sid_size(sid, end);
1971         if (sid_len < 0) {
1972                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1973                 return;
1974         }
1975         memcpy(&posix->group, sid, sid_len);
1976
1977         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1978                  posix->nlink, posix->mode, posix->reparse_tag);
1979 }
1980
1981 void
1982 smb2_parse_contexts(struct TCP_Server_Info *server,
1983                     struct smb2_create_rsp *rsp,
1984                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1985                     struct smb2_file_all_info *buf,
1986                     struct create_posix_rsp *posix)
1987 {
1988         char *data_offset;
1989         struct create_context *cc;
1990         unsigned int next;
1991         unsigned int remaining;
1992         char *name;
1993         static const char smb3_create_tag_posix[] = {
1994                 0x93, 0xAD, 0x25, 0x50, 0x9C,
1995                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
1996                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
1997         };
1998
1999         *oplock = 0;
2000         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2001         remaining = le32_to_cpu(rsp->CreateContextsLength);
2002         cc = (struct create_context *)data_offset;
2003
2004         /* Initialize inode number to 0 in case no valid data in qfid context */
2005         if (buf)
2006                 buf->IndexNumber = 0;
2007
2008         while (remaining >= sizeof(struct create_context)) {
2009                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2010                 if (le16_to_cpu(cc->NameLength) == 4 &&
2011                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2012                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2013                                                            lease_key);
2014                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2015                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2016                         parse_query_id_ctxt(cc, buf);
2017                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2018                         if (posix &&
2019                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2020                                 parse_posix_ctxt(cc, buf, posix);
2021                 }
2022                 /* else {
2023                         cifs_dbg(FYI, "Context not matched with len %d\n",
2024                                 le16_to_cpu(cc->NameLength));
2025                         cifs_dump_mem("Cctxt name: ", name, 4);
2026                 } */
2027
2028                 next = le32_to_cpu(cc->Next);
2029                 if (!next)
2030                         break;
2031                 remaining -= next;
2032                 cc = (struct create_context *)((char *)cc + next);
2033         }
2034
2035         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2036                 *oplock = rsp->OplockLevel;
2037
2038         return;
2039 }
2040
2041 static int
2042 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2043                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2044 {
2045         struct smb2_create_req *req = iov[0].iov_base;
2046         unsigned int num = *num_iovec;
2047
2048         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2049         if (iov[num].iov_base == NULL)
2050                 return -ENOMEM;
2051         iov[num].iov_len = server->vals->create_lease_size;
2052         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2053         if (!req->CreateContextsOffset)
2054                 req->CreateContextsOffset = cpu_to_le32(
2055                                 sizeof(struct smb2_create_req) +
2056                                 iov[num - 1].iov_len);
2057         le32_add_cpu(&req->CreateContextsLength,
2058                      server->vals->create_lease_size);
2059         *num_iovec = num + 1;
2060         return 0;
2061 }
2062
2063 static struct create_durable_v2 *
2064 create_durable_v2_buf(struct cifs_open_parms *oparms)
2065 {
2066         struct cifs_fid *pfid = oparms->fid;
2067         struct create_durable_v2 *buf;
2068
2069         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2070         if (!buf)
2071                 return NULL;
2072
2073         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2074                                         (struct create_durable_v2, dcontext));
2075         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2076         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2077                                 (struct create_durable_v2, Name));
2078         buf->ccontext.NameLength = cpu_to_le16(4);
2079
2080         /*
2081          * NB: Handle timeout defaults to 0, which allows server to choose
2082          * (most servers default to 120 seconds) and most clients default to 0.
2083          * This can be overridden at mount ("handletimeout=") if the user wants
2084          * a different persistent (or resilient) handle timeout for all opens
2085          * opens on a particular SMB3 mount.
2086          */
2087         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2088         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2089         generate_random_uuid(buf->dcontext.CreateGuid);
2090         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2091
2092         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2093         buf->Name[0] = 'D';
2094         buf->Name[1] = 'H';
2095         buf->Name[2] = '2';
2096         buf->Name[3] = 'Q';
2097         return buf;
2098 }
2099
2100 static struct create_durable_handle_reconnect_v2 *
2101 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2102 {
2103         struct create_durable_handle_reconnect_v2 *buf;
2104
2105         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2106                         GFP_KERNEL);
2107         if (!buf)
2108                 return NULL;
2109
2110         buf->ccontext.DataOffset =
2111                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2112                                      dcontext));
2113         buf->ccontext.DataLength =
2114                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2115         buf->ccontext.NameOffset =
2116                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2117                             Name));
2118         buf->ccontext.NameLength = cpu_to_le16(4);
2119
2120         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2121         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2122         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2123         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2124
2125         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2126         buf->Name[0] = 'D';
2127         buf->Name[1] = 'H';
2128         buf->Name[2] = '2';
2129         buf->Name[3] = 'C';
2130         return buf;
2131 }
2132
2133 static int
2134 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2135                     struct cifs_open_parms *oparms)
2136 {
2137         struct smb2_create_req *req = iov[0].iov_base;
2138         unsigned int num = *num_iovec;
2139
2140         iov[num].iov_base = create_durable_v2_buf(oparms);
2141         if (iov[num].iov_base == NULL)
2142                 return -ENOMEM;
2143         iov[num].iov_len = sizeof(struct create_durable_v2);
2144         if (!req->CreateContextsOffset)
2145                 req->CreateContextsOffset =
2146                         cpu_to_le32(sizeof(struct smb2_create_req) +
2147                                                                 iov[1].iov_len);
2148         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2149         *num_iovec = num + 1;
2150         return 0;
2151 }
2152
2153 static int
2154 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2155                     struct cifs_open_parms *oparms)
2156 {
2157         struct smb2_create_req *req = iov[0].iov_base;
2158         unsigned int num = *num_iovec;
2159
2160         /* indicate that we don't need to relock the file */
2161         oparms->reconnect = false;
2162
2163         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2164         if (iov[num].iov_base == NULL)
2165                 return -ENOMEM;
2166         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2167         if (!req->CreateContextsOffset)
2168                 req->CreateContextsOffset =
2169                         cpu_to_le32(sizeof(struct smb2_create_req) +
2170                                                                 iov[1].iov_len);
2171         le32_add_cpu(&req->CreateContextsLength,
2172                         sizeof(struct create_durable_handle_reconnect_v2));
2173         *num_iovec = num + 1;
2174         return 0;
2175 }
2176
2177 static int
2178 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2179                     struct cifs_open_parms *oparms, bool use_persistent)
2180 {
2181         struct smb2_create_req *req = iov[0].iov_base;
2182         unsigned int num = *num_iovec;
2183
2184         if (use_persistent) {
2185                 if (oparms->reconnect)
2186                         return add_durable_reconnect_v2_context(iov, num_iovec,
2187                                                                 oparms);
2188                 else
2189                         return add_durable_v2_context(iov, num_iovec, oparms);
2190         }
2191
2192         if (oparms->reconnect) {
2193                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2194                 /* indicate that we don't need to relock the file */
2195                 oparms->reconnect = false;
2196         } else
2197                 iov[num].iov_base = create_durable_buf();
2198         if (iov[num].iov_base == NULL)
2199                 return -ENOMEM;
2200         iov[num].iov_len = sizeof(struct create_durable);
2201         if (!req->CreateContextsOffset)
2202                 req->CreateContextsOffset =
2203                         cpu_to_le32(sizeof(struct smb2_create_req) +
2204                                                                 iov[1].iov_len);
2205         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2206         *num_iovec = num + 1;
2207         return 0;
2208 }
2209
2210 /* See MS-SMB2 2.2.13.2.7 */
2211 static struct crt_twarp_ctxt *
2212 create_twarp_buf(__u64 timewarp)
2213 {
2214         struct crt_twarp_ctxt *buf;
2215
2216         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2217         if (!buf)
2218                 return NULL;
2219
2220         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2221                                         (struct crt_twarp_ctxt, Timestamp));
2222         buf->ccontext.DataLength = cpu_to_le32(8);
2223         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2224                                 (struct crt_twarp_ctxt, Name));
2225         buf->ccontext.NameLength = cpu_to_le16(4);
2226         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2227         buf->Name[0] = 'T';
2228         buf->Name[1] = 'W';
2229         buf->Name[2] = 'r';
2230         buf->Name[3] = 'p';
2231         buf->Timestamp = cpu_to_le64(timewarp);
2232         return buf;
2233 }
2234
2235 /* See MS-SMB2 2.2.13.2.7 */
2236 static int
2237 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2238 {
2239         struct smb2_create_req *req = iov[0].iov_base;
2240         unsigned int num = *num_iovec;
2241
2242         iov[num].iov_base = create_twarp_buf(timewarp);
2243         if (iov[num].iov_base == NULL)
2244                 return -ENOMEM;
2245         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2246         if (!req->CreateContextsOffset)
2247                 req->CreateContextsOffset = cpu_to_le32(
2248                                 sizeof(struct smb2_create_req) +
2249                                 iov[num - 1].iov_len);
2250         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2251         *num_iovec = num + 1;
2252         return 0;
2253 }
2254
2255 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2256 static void setup_owner_group_sids(char *buf)
2257 {
2258         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2259
2260         /* Populate the user ownership fields S-1-5-88-1 */
2261         sids->owner.Revision = 1;
2262         sids->owner.NumAuth = 3;
2263         sids->owner.Authority[5] = 5;
2264         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2265         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2266         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2267
2268         /* Populate the group ownership fields S-1-5-88-2 */
2269         sids->group.Revision = 1;
2270         sids->group.NumAuth = 3;
2271         sids->group.Authority[5] = 5;
2272         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2273         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2274         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2275
2276         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2277 }
2278
2279 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2280 static struct crt_sd_ctxt *
2281 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2282 {
2283         struct crt_sd_ctxt *buf;
2284         __u8 *ptr, *aclptr;
2285         unsigned int acelen, acl_size, ace_count;
2286         unsigned int owner_offset = 0;
2287         unsigned int group_offset = 0;
2288         struct smb3_acl acl;
2289
2290         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2291
2292         if (set_owner) {
2293                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2294                 *len += sizeof(struct owner_group_sids);
2295         }
2296
2297         buf = kzalloc(*len, GFP_KERNEL);
2298         if (buf == NULL)
2299                 return buf;
2300
2301         ptr = (__u8 *)&buf[1];
2302         if (set_owner) {
2303                 /* offset fields are from beginning of security descriptor not of create context */
2304                 owner_offset = ptr - (__u8 *)&buf->sd;
2305                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2306                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2307                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2308
2309                 setup_owner_group_sids(ptr);
2310                 ptr += sizeof(struct owner_group_sids);
2311         } else {
2312                 buf->sd.OffsetOwner = 0;
2313                 buf->sd.OffsetGroup = 0;
2314         }
2315
2316         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2317         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2318         buf->ccontext.NameLength = cpu_to_le16(4);
2319         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2320         buf->Name[0] = 'S';
2321         buf->Name[1] = 'e';
2322         buf->Name[2] = 'c';
2323         buf->Name[3] = 'D';
2324         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2325
2326         /*
2327          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2328          * and "DP" ie the DACL is present
2329          */
2330         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2331
2332         /* offset owner, group and Sbz1 and SACL are all zero */
2333         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2334         /* Ship the ACL for now. we will copy it into buf later. */
2335         aclptr = ptr;
2336         ptr += sizeof(struct cifs_acl);
2337
2338         /* create one ACE to hold the mode embedded in reserved special SID */
2339         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2340         ptr += acelen;
2341         acl_size = acelen + sizeof(struct smb3_acl);
2342         ace_count = 1;
2343
2344         if (set_owner) {
2345                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2346                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2347                 ptr += acelen;
2348                 acl_size += acelen;
2349                 ace_count += 1;
2350         }
2351
2352         /* and one more ACE to allow access for authenticated users */
2353         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2354         ptr += acelen;
2355         acl_size += acelen;
2356         ace_count += 1;
2357
2358         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2359         acl.AclSize = cpu_to_le16(acl_size);
2360         acl.AceCount = cpu_to_le16(ace_count);
2361         memcpy(aclptr, &acl, sizeof(struct cifs_acl));
2362
2363         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2364         *len = ptr - (__u8 *)buf;
2365
2366         return buf;
2367 }
2368
2369 static int
2370 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2371 {
2372         struct smb2_create_req *req = iov[0].iov_base;
2373         unsigned int num = *num_iovec;
2374         unsigned int len = 0;
2375
2376         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2377         if (iov[num].iov_base == NULL)
2378                 return -ENOMEM;
2379         iov[num].iov_len = len;
2380         if (!req->CreateContextsOffset)
2381                 req->CreateContextsOffset = cpu_to_le32(
2382                                 sizeof(struct smb2_create_req) +
2383                                 iov[num - 1].iov_len);
2384         le32_add_cpu(&req->CreateContextsLength, len);
2385         *num_iovec = num + 1;
2386         return 0;
2387 }
2388
2389 static struct crt_query_id_ctxt *
2390 create_query_id_buf(void)
2391 {
2392         struct crt_query_id_ctxt *buf;
2393
2394         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2395         if (!buf)
2396                 return NULL;
2397
2398         buf->ccontext.DataOffset = cpu_to_le16(0);
2399         buf->ccontext.DataLength = cpu_to_le32(0);
2400         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2401                                 (struct crt_query_id_ctxt, Name));
2402         buf->ccontext.NameLength = cpu_to_le16(4);
2403         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2404         buf->Name[0] = 'Q';
2405         buf->Name[1] = 'F';
2406         buf->Name[2] = 'i';
2407         buf->Name[3] = 'd';
2408         return buf;
2409 }
2410
2411 /* See MS-SMB2 2.2.13.2.9 */
2412 static int
2413 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2414 {
2415         struct smb2_create_req *req = iov[0].iov_base;
2416         unsigned int num = *num_iovec;
2417
2418         iov[num].iov_base = create_query_id_buf();
2419         if (iov[num].iov_base == NULL)
2420                 return -ENOMEM;
2421         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2422         if (!req->CreateContextsOffset)
2423                 req->CreateContextsOffset = cpu_to_le32(
2424                                 sizeof(struct smb2_create_req) +
2425                                 iov[num - 1].iov_len);
2426         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2427         *num_iovec = num + 1;
2428         return 0;
2429 }
2430
2431 static int
2432 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2433                             const char *treename, const __le16 *path)
2434 {
2435         int treename_len, path_len;
2436         struct nls_table *cp;
2437         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2438
2439         /*
2440          * skip leading "\\"
2441          */
2442         treename_len = strlen(treename);
2443         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2444                 return -EINVAL;
2445
2446         treename += 2;
2447         treename_len -= 2;
2448
2449         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2450
2451         /*
2452          * make room for one path separator between the treename and
2453          * path
2454          */
2455         *out_len = treename_len + 1 + path_len;
2456
2457         /*
2458          * final path needs to be null-terminated UTF16 with a
2459          * size aligned to 8
2460          */
2461
2462         *out_size = roundup((*out_len+1)*2, 8);
2463         *out_path = kzalloc(*out_size, GFP_KERNEL);
2464         if (!*out_path)
2465                 return -ENOMEM;
2466
2467         cp = load_nls_default();
2468         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2469         UniStrcat(*out_path, sep);
2470         UniStrcat(*out_path, path);
2471         unload_nls(cp);
2472
2473         return 0;
2474 }
2475
2476 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2477                                umode_t mode, struct cifs_tcon *tcon,
2478                                const char *full_path,
2479                                struct cifs_sb_info *cifs_sb)
2480 {
2481         struct smb_rqst rqst;
2482         struct smb2_create_req *req;
2483         struct smb2_create_rsp *rsp = NULL;
2484         struct cifs_ses *ses = tcon->ses;
2485         struct kvec iov[3]; /* make sure at least one for each open context */
2486         struct kvec rsp_iov = {NULL, 0};
2487         int resp_buftype;
2488         int uni_path_len;
2489         __le16 *copy_path = NULL;
2490         int copy_size;
2491         int rc = 0;
2492         unsigned int n_iov = 2;
2493         __u32 file_attributes = 0;
2494         char *pc_buf = NULL;
2495         int flags = 0;
2496         unsigned int total_len;
2497         __le16 *utf16_path = NULL;
2498         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2499
2500         cifs_dbg(FYI, "mkdir\n");
2501
2502         /* resource #1: path allocation */
2503         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2504         if (!utf16_path)
2505                 return -ENOMEM;
2506
2507         if (!ses || !server) {
2508                 rc = -EIO;
2509                 goto err_free_path;
2510         }
2511
2512         /* resource #2: request */
2513         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2514                                  (void **) &req, &total_len);
2515         if (rc)
2516                 goto err_free_path;
2517
2518
2519         if (smb3_encryption_required(tcon))
2520                 flags |= CIFS_TRANSFORM_REQ;
2521
2522         req->ImpersonationLevel = IL_IMPERSONATION;
2523         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2524         /* File attributes ignored on open (used in create though) */
2525         req->FileAttributes = cpu_to_le32(file_attributes);
2526         req->ShareAccess = FILE_SHARE_ALL_LE;
2527         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2528         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2529
2530         iov[0].iov_base = (char *)req;
2531         /* -1 since last byte is buf[0] which is sent below (path) */
2532         iov[0].iov_len = total_len - 1;
2533
2534         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2535
2536         /* [MS-SMB2] 2.2.13 NameOffset:
2537          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2538          * the SMB2 header, the file name includes a prefix that will
2539          * be processed during DFS name normalization as specified in
2540          * section 3.3.5.9. Otherwise, the file name is relative to
2541          * the share that is identified by the TreeId in the SMB2
2542          * header.
2543          */
2544         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2545                 int name_len;
2546
2547                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2548                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2549                                                  &name_len,
2550                                                  tcon->treeName, utf16_path);
2551                 if (rc)
2552                         goto err_free_req;
2553
2554                 req->NameLength = cpu_to_le16(name_len * 2);
2555                 uni_path_len = copy_size;
2556                 /* free before overwriting resource */
2557                 kfree(utf16_path);
2558                 utf16_path = copy_path;
2559         } else {
2560                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2561                 /* MUST set path len (NameLength) to 0 opening root of share */
2562                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2563                 if (uni_path_len % 8 != 0) {
2564                         copy_size = roundup(uni_path_len, 8);
2565                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2566                         if (!copy_path) {
2567                                 rc = -ENOMEM;
2568                                 goto err_free_req;
2569                         }
2570                         memcpy((char *)copy_path, (const char *)utf16_path,
2571                                uni_path_len);
2572                         uni_path_len = copy_size;
2573                         /* free before overwriting resource */
2574                         kfree(utf16_path);
2575                         utf16_path = copy_path;
2576                 }
2577         }
2578
2579         iov[1].iov_len = uni_path_len;
2580         iov[1].iov_base = utf16_path;
2581         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2582
2583         if (tcon->posix_extensions) {
2584                 /* resource #3: posix buf */
2585                 rc = add_posix_context(iov, &n_iov, mode);
2586                 if (rc)
2587                         goto err_free_req;
2588                 pc_buf = iov[n_iov-1].iov_base;
2589         }
2590
2591
2592         memset(&rqst, 0, sizeof(struct smb_rqst));
2593         rqst.rq_iov = iov;
2594         rqst.rq_nvec = n_iov;
2595
2596         /* no need to inc num_remote_opens because we close it just below */
2597         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2598                                     FILE_WRITE_ATTRIBUTES);
2599         /* resource #4: response buffer */
2600         rc = cifs_send_recv(xid, ses, server,
2601                             &rqst, &resp_buftype, flags, &rsp_iov);
2602         if (rc) {
2603                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2604                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2605                                            CREATE_NOT_FILE,
2606                                            FILE_WRITE_ATTRIBUTES, rc);
2607                 goto err_free_rsp_buf;
2608         }
2609
2610         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2611         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2612                                     ses->Suid, CREATE_NOT_FILE,
2613                                     FILE_WRITE_ATTRIBUTES);
2614
2615         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2616
2617         /* Eventually save off posix specific response info and timestaps */
2618
2619 err_free_rsp_buf:
2620         free_rsp_buf(resp_buftype, rsp);
2621         kfree(pc_buf);
2622 err_free_req:
2623         cifs_small_buf_release(req);
2624 err_free_path:
2625         kfree(utf16_path);
2626         return rc;
2627 }
2628
2629 int
2630 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2631                struct smb_rqst *rqst, __u8 *oplock,
2632                struct cifs_open_parms *oparms, __le16 *path)
2633 {
2634         struct smb2_create_req *req;
2635         unsigned int n_iov = 2;
2636         __u32 file_attributes = 0;
2637         int copy_size;
2638         int uni_path_len;
2639         unsigned int total_len;
2640         struct kvec *iov = rqst->rq_iov;
2641         __le16 *copy_path;
2642         int rc;
2643
2644         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2645                                  (void **) &req, &total_len);
2646         if (rc)
2647                 return rc;
2648
2649         iov[0].iov_base = (char *)req;
2650         /* -1 since last byte is buf[0] which is sent below (path) */
2651         iov[0].iov_len = total_len - 1;
2652
2653         if (oparms->create_options & CREATE_OPTION_READONLY)
2654                 file_attributes |= ATTR_READONLY;
2655         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2656                 file_attributes |= ATTR_SYSTEM;
2657
2658         req->ImpersonationLevel = IL_IMPERSONATION;
2659         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2660         /* File attributes ignored on open (used in create though) */
2661         req->FileAttributes = cpu_to_le32(file_attributes);
2662         req->ShareAccess = FILE_SHARE_ALL_LE;
2663
2664         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2665         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2666         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2667
2668         /* [MS-SMB2] 2.2.13 NameOffset:
2669          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2670          * the SMB2 header, the file name includes a prefix that will
2671          * be processed during DFS name normalization as specified in
2672          * section 3.3.5.9. Otherwise, the file name is relative to
2673          * the share that is identified by the TreeId in the SMB2
2674          * header.
2675          */
2676         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2677                 int name_len;
2678
2679                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2680                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2681                                                  &name_len,
2682                                                  tcon->treeName, path);
2683                 if (rc)
2684                         return rc;
2685                 req->NameLength = cpu_to_le16(name_len * 2);
2686                 uni_path_len = copy_size;
2687                 path = copy_path;
2688         } else {
2689                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2690                 /* MUST set path len (NameLength) to 0 opening root of share */
2691                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2692                 copy_size = uni_path_len;
2693                 if (copy_size % 8 != 0)
2694                         copy_size = roundup(copy_size, 8);
2695                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2696                 if (!copy_path)
2697                         return -ENOMEM;
2698                 memcpy((char *)copy_path, (const char *)path,
2699                        uni_path_len);
2700                 uni_path_len = copy_size;
2701                 path = copy_path;
2702         }
2703
2704         iov[1].iov_len = uni_path_len;
2705         iov[1].iov_base = path;
2706
2707         if ((!server->oplocks) || (tcon->no_lease))
2708                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2709
2710         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2711             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2712                 req->RequestedOplockLevel = *oplock;
2713         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2714                   (oparms->create_options & CREATE_NOT_FILE))
2715                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2716         else {
2717                 rc = add_lease_context(server, iov, &n_iov,
2718                                        oparms->fid->lease_key, oplock);
2719                 if (rc)
2720                         return rc;
2721         }
2722
2723         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2724                 /* need to set Next field of lease context if we request it */
2725                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2726                         struct create_context *ccontext =
2727                             (struct create_context *)iov[n_iov-1].iov_base;
2728                         ccontext->Next =
2729                                 cpu_to_le32(server->vals->create_lease_size);
2730                 }
2731
2732                 rc = add_durable_context(iov, &n_iov, oparms,
2733                                         tcon->use_persistent);
2734                 if (rc)
2735                         return rc;
2736         }
2737
2738         if (tcon->posix_extensions) {
2739                 if (n_iov > 2) {
2740                         struct create_context *ccontext =
2741                             (struct create_context *)iov[n_iov-1].iov_base;
2742                         ccontext->Next =
2743                                 cpu_to_le32(iov[n_iov-1].iov_len);
2744                 }
2745
2746                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2747                 if (rc)
2748                         return rc;
2749         }
2750
2751         if (tcon->snapshot_time) {
2752                 cifs_dbg(FYI, "adding snapshot context\n");
2753                 if (n_iov > 2) {
2754                         struct create_context *ccontext =
2755                             (struct create_context *)iov[n_iov-1].iov_base;
2756                         ccontext->Next =
2757                                 cpu_to_le32(iov[n_iov-1].iov_len);
2758                 }
2759
2760                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2761                 if (rc)
2762                         return rc;
2763         }
2764
2765         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2766                 bool set_mode;
2767                 bool set_owner;
2768
2769                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2770                     (oparms->mode != ACL_NO_MODE))
2771                         set_mode = true;
2772                 else {
2773                         set_mode = false;
2774                         oparms->mode = ACL_NO_MODE;
2775                 }
2776
2777                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2778                         set_owner = true;
2779                 else
2780                         set_owner = false;
2781
2782                 if (set_owner | set_mode) {
2783                         if (n_iov > 2) {
2784                                 struct create_context *ccontext =
2785                                     (struct create_context *)iov[n_iov-1].iov_base;
2786                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2787                         }
2788
2789                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2790                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2791                         if (rc)
2792                                 return rc;
2793                 }
2794         }
2795
2796         if (n_iov > 2) {
2797                 struct create_context *ccontext =
2798                         (struct create_context *)iov[n_iov-1].iov_base;
2799                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2800         }
2801         add_query_id_context(iov, &n_iov);
2802
2803         rqst->rq_nvec = n_iov;
2804         return 0;
2805 }
2806
2807 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2808  * All other vectors are freed by kfree().
2809  */
2810 void
2811 SMB2_open_free(struct smb_rqst *rqst)
2812 {
2813         int i;
2814
2815         if (rqst && rqst->rq_iov) {
2816                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2817                 for (i = 1; i < rqst->rq_nvec; i++)
2818                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2819                                 kfree(rqst->rq_iov[i].iov_base);
2820         }
2821 }
2822
2823 int
2824 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2825           __u8 *oplock, struct smb2_file_all_info *buf,
2826           struct create_posix_rsp *posix,
2827           struct kvec *err_iov, int *buftype)
2828 {
2829         struct smb_rqst rqst;
2830         struct smb2_create_rsp *rsp = NULL;
2831         struct cifs_tcon *tcon = oparms->tcon;
2832         struct cifs_ses *ses = tcon->ses;
2833         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2834         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2835         struct kvec rsp_iov = {NULL, 0};
2836         int resp_buftype = CIFS_NO_BUFFER;
2837         int rc = 0;
2838         int flags = 0;
2839
2840         cifs_dbg(FYI, "create/open\n");
2841         if (!ses || !server)
2842                 return -EIO;
2843
2844         if (smb3_encryption_required(tcon))
2845                 flags |= CIFS_TRANSFORM_REQ;
2846
2847         memset(&rqst, 0, sizeof(struct smb_rqst));
2848         memset(&iov, 0, sizeof(iov));
2849         rqst.rq_iov = iov;
2850         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2851
2852         rc = SMB2_open_init(tcon, server,
2853                             &rqst, oplock, oparms, path);
2854         if (rc)
2855                 goto creat_exit;
2856
2857         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2858                 oparms->create_options, oparms->desired_access);
2859
2860         rc = cifs_send_recv(xid, ses, server,
2861                             &rqst, &resp_buftype, flags,
2862                             &rsp_iov);
2863         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2864
2865         if (rc != 0) {
2866                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2867                 if (err_iov && rsp) {
2868                         *err_iov = rsp_iov;
2869                         *buftype = resp_buftype;
2870                         resp_buftype = CIFS_NO_BUFFER;
2871                         rsp = NULL;
2872                 }
2873                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2874                                     oparms->create_options, oparms->desired_access, rc);
2875                 if (rc == -EREMCHG) {
2876                         pr_warn_once("server share %s deleted\n",
2877                                      tcon->treeName);
2878                         tcon->need_reconnect = true;
2879                 }
2880                 goto creat_exit;
2881         } else
2882                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2883                                      ses->Suid, oparms->create_options,
2884                                      oparms->desired_access);
2885
2886         atomic_inc(&tcon->num_remote_opens);
2887         oparms->fid->persistent_fid = rsp->PersistentFileId;
2888         oparms->fid->volatile_fid = rsp->VolatileFileId;
2889         oparms->fid->access = oparms->desired_access;
2890 #ifdef CONFIG_CIFS_DEBUG2
2891         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2892 #endif /* CIFS_DEBUG2 */
2893
2894         if (buf) {
2895                 buf->CreationTime = rsp->CreationTime;
2896                 buf->LastAccessTime = rsp->LastAccessTime;
2897                 buf->LastWriteTime = rsp->LastWriteTime;
2898                 buf->ChangeTime = rsp->ChangeTime;
2899                 buf->AllocationSize = rsp->AllocationSize;
2900                 buf->EndOfFile = rsp->EndofFile;
2901                 buf->Attributes = rsp->FileAttributes;
2902                 buf->NumberOfLinks = cpu_to_le32(1);
2903                 buf->DeletePending = 0;
2904         }
2905
2906
2907         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2908                             oparms->fid->lease_key, oplock, buf, posix);
2909 creat_exit:
2910         SMB2_open_free(&rqst);
2911         free_rsp_buf(resp_buftype, rsp);
2912         return rc;
2913 }
2914
2915 int
2916 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2917                 struct smb_rqst *rqst,
2918                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2919                 bool is_fsctl, char *in_data, u32 indatalen,
2920                 __u32 max_response_size)
2921 {
2922         struct smb2_ioctl_req *req;
2923         struct kvec *iov = rqst->rq_iov;
2924         unsigned int total_len;
2925         int rc;
2926         char *in_data_buf;
2927
2928         rc = smb2_ioctl_req_init(opcode, tcon, server,
2929                                  (void **) &req, &total_len);
2930         if (rc)
2931                 return rc;
2932
2933         if (indatalen) {
2934                 /*
2935                  * indatalen is usually small at a couple of bytes max, so
2936                  * just allocate through generic pool
2937                  */
2938                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2939                 if (!in_data_buf) {
2940                         cifs_small_buf_release(req);
2941                         return -ENOMEM;
2942                 }
2943         }
2944
2945         req->CtlCode = cpu_to_le32(opcode);
2946         req->PersistentFileId = persistent_fid;
2947         req->VolatileFileId = volatile_fid;
2948
2949         iov[0].iov_base = (char *)req;
2950         /*
2951          * If no input data, the size of ioctl struct in
2952          * protocol spec still includes a 1 byte data buffer,
2953          * but if input data passed to ioctl, we do not
2954          * want to double count this, so we do not send
2955          * the dummy one byte of data in iovec[0] if sending
2956          * input data (in iovec[1]).
2957          */
2958         if (indatalen) {
2959                 req->InputCount = cpu_to_le32(indatalen);
2960                 /* do not set InputOffset if no input data */
2961                 req->InputOffset =
2962                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2963                 rqst->rq_nvec = 2;
2964                 iov[0].iov_len = total_len - 1;
2965                 iov[1].iov_base = in_data_buf;
2966                 iov[1].iov_len = indatalen;
2967         } else {
2968                 rqst->rq_nvec = 1;
2969                 iov[0].iov_len = total_len;
2970         }
2971
2972         req->OutputOffset = 0;
2973         req->OutputCount = 0; /* MBZ */
2974
2975         /*
2976          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2977          * We Could increase default MaxOutputResponse, but that could require
2978          * more credits. Windows typically sets this smaller, but for some
2979          * ioctls it may be useful to allow server to send more. No point
2980          * limiting what the server can send as long as fits in one credit
2981          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2982          * to increase this limit up in the future.
2983          * Note that for snapshot queries that servers like Azure expect that
2984          * the first query be minimal size (and just used to get the number/size
2985          * of previous versions) so response size must be specified as EXACTLY
2986          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2987          * of eight bytes.  Currently that is the only case where we set max
2988          * response size smaller.
2989          */
2990         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2991         req->sync_hdr.CreditCharge =
2992                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2993                                          SMB2_MAX_BUFFER_SIZE));
2994         if (is_fsctl)
2995                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2996         else
2997                 req->Flags = 0;
2998
2999         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3000         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3001                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3002
3003         return 0;
3004 }
3005
3006 void
3007 SMB2_ioctl_free(struct smb_rqst *rqst)
3008 {
3009         int i;
3010         if (rqst && rqst->rq_iov) {
3011                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3012                 for (i = 1; i < rqst->rq_nvec; i++)
3013                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3014                                 kfree(rqst->rq_iov[i].iov_base);
3015         }
3016 }
3017
3018
3019 /*
3020  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3021  */
3022 int
3023 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3024            u64 volatile_fid, u32 opcode, bool is_fsctl,
3025            char *in_data, u32 indatalen, u32 max_out_data_len,
3026            char **out_data, u32 *plen /* returned data len */)
3027 {
3028         struct smb_rqst rqst;
3029         struct smb2_ioctl_rsp *rsp = NULL;
3030         struct cifs_ses *ses;
3031         struct TCP_Server_Info *server;
3032         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3033         struct kvec rsp_iov = {NULL, 0};
3034         int resp_buftype = CIFS_NO_BUFFER;
3035         int rc = 0;
3036         int flags = 0;
3037
3038         cifs_dbg(FYI, "SMB2 IOCTL\n");
3039
3040         if (out_data != NULL)
3041                 *out_data = NULL;
3042
3043         /* zero out returned data len, in case of error */
3044         if (plen)
3045                 *plen = 0;
3046
3047         if (!tcon)
3048                 return -EIO;
3049
3050         ses = tcon->ses;
3051         if (!ses)
3052                 return -EIO;
3053
3054         server = cifs_pick_channel(ses);
3055         if (!server)
3056                 return -EIO;
3057
3058         if (smb3_encryption_required(tcon))
3059                 flags |= CIFS_TRANSFORM_REQ;
3060
3061         memset(&rqst, 0, sizeof(struct smb_rqst));
3062         memset(&iov, 0, sizeof(iov));
3063         rqst.rq_iov = iov;
3064         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3065
3066         rc = SMB2_ioctl_init(tcon, server,
3067                              &rqst, persistent_fid, volatile_fid, opcode,
3068                              is_fsctl, in_data, indatalen, max_out_data_len);
3069         if (rc)
3070                 goto ioctl_exit;
3071
3072         rc = cifs_send_recv(xid, ses, server,
3073                             &rqst, &resp_buftype, flags,
3074                             &rsp_iov);
3075         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3076
3077         if (rc != 0)
3078                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3079                                 ses->Suid, 0, opcode, rc);
3080
3081         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3082                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3083                 goto ioctl_exit;
3084         } else if (rc == -EINVAL) {
3085                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3086                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3087                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3088                         goto ioctl_exit;
3089                 }
3090         } else if (rc == -E2BIG) {
3091                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3092                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3093                         goto ioctl_exit;
3094                 }
3095         }
3096
3097         /* check if caller wants to look at return data or just return rc */
3098         if ((plen == NULL) || (out_data == NULL))
3099                 goto ioctl_exit;
3100
3101         *plen = le32_to_cpu(rsp->OutputCount);
3102
3103         /* We check for obvious errors in the output buffer length and offset */
3104         if (*plen == 0)
3105                 goto ioctl_exit; /* server returned no data */
3106         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3107                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3108                 *plen = 0;
3109                 rc = -EIO;
3110                 goto ioctl_exit;
3111         }
3112
3113         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3114                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3115                         le32_to_cpu(rsp->OutputOffset));
3116                 *plen = 0;
3117                 rc = -EIO;
3118                 goto ioctl_exit;
3119         }
3120
3121         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3122                             *plen, GFP_KERNEL);
3123         if (*out_data == NULL) {
3124                 rc = -ENOMEM;
3125                 goto ioctl_exit;
3126         }
3127
3128 ioctl_exit:
3129         SMB2_ioctl_free(&rqst);
3130         free_rsp_buf(resp_buftype, rsp);
3131         return rc;
3132 }
3133
3134 /*
3135  *   Individual callers to ioctl worker function follow
3136  */
3137
3138 int
3139 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3140                      u64 persistent_fid, u64 volatile_fid)
3141 {
3142         int rc;
3143         struct  compress_ioctl fsctl_input;
3144         char *ret_data = NULL;
3145
3146         fsctl_input.CompressionState =
3147                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3148
3149         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3150                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3151                         (char *)&fsctl_input /* data input */,
3152                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3153                         &ret_data /* out data */, NULL);
3154
3155         cifs_dbg(FYI, "set compression rc %d\n", rc);
3156
3157         return rc;
3158 }
3159
3160 int
3161 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3162                 struct smb_rqst *rqst,
3163                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3164 {
3165         struct smb2_close_req *req;
3166         struct kvec *iov = rqst->rq_iov;
3167         unsigned int total_len;
3168         int rc;
3169
3170         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3171                                  (void **) &req, &total_len);
3172         if (rc)
3173                 return rc;
3174
3175         req->PersistentFileId = persistent_fid;
3176         req->VolatileFileId = volatile_fid;
3177         if (query_attrs)
3178                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3179         else
3180                 req->Flags = 0;
3181         iov[0].iov_base = (char *)req;
3182         iov[0].iov_len = total_len;
3183
3184         return 0;
3185 }
3186
3187 void
3188 SMB2_close_free(struct smb_rqst *rqst)
3189 {
3190         if (rqst && rqst->rq_iov)
3191                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3192 }
3193
3194 int
3195 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3196              u64 persistent_fid, u64 volatile_fid,
3197              struct smb2_file_network_open_info *pbuf)
3198 {
3199         struct smb_rqst rqst;
3200         struct smb2_close_rsp *rsp = NULL;
3201         struct cifs_ses *ses = tcon->ses;
3202         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3203         struct kvec iov[1];
3204         struct kvec rsp_iov;
3205         int resp_buftype = CIFS_NO_BUFFER;
3206         int rc = 0;
3207         int flags = 0;
3208         bool query_attrs = false;
3209
3210         cifs_dbg(FYI, "Close\n");
3211
3212         if (!ses || !server)
3213                 return -EIO;
3214
3215         if (smb3_encryption_required(tcon))
3216                 flags |= CIFS_TRANSFORM_REQ;
3217
3218         memset(&rqst, 0, sizeof(struct smb_rqst));
3219         memset(&iov, 0, sizeof(iov));
3220         rqst.rq_iov = iov;
3221         rqst.rq_nvec = 1;
3222
3223         /* check if need to ask server to return timestamps in close response */
3224         if (pbuf)
3225                 query_attrs = true;
3226
3227         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3228         rc = SMB2_close_init(tcon, server,
3229                              &rqst, persistent_fid, volatile_fid,
3230                              query_attrs);
3231         if (rc)
3232                 goto close_exit;
3233
3234         rc = cifs_send_recv(xid, ses, server,
3235                             &rqst, &resp_buftype, flags, &rsp_iov);
3236         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3237
3238         if (rc != 0) {
3239                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3240                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3241                                      rc);
3242                 goto close_exit;
3243         } else {
3244                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3245                                       ses->Suid);
3246                 /*
3247                  * Note that have to subtract 4 since struct network_open_info
3248                  * has a final 4 byte pad that close response does not have
3249                  */
3250                 if (pbuf)
3251                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3252         }
3253
3254         atomic_dec(&tcon->num_remote_opens);
3255 close_exit:
3256         SMB2_close_free(&rqst);
3257         free_rsp_buf(resp_buftype, rsp);
3258
3259         /* retry close in a worker thread if this one is interrupted */
3260         if (is_interrupt_error(rc)) {
3261                 int tmp_rc;
3262
3263                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3264                                                      volatile_fid);
3265                 if (tmp_rc)
3266                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3267                                  persistent_fid, tmp_rc);
3268         }
3269         return rc;
3270 }
3271
3272 int
3273 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3274                 u64 persistent_fid, u64 volatile_fid)
3275 {
3276         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3277 }
3278
3279 int
3280 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3281                   struct kvec *iov, unsigned int min_buf_size)
3282 {
3283         unsigned int smb_len = iov->iov_len;
3284         char *end_of_smb = smb_len + (char *)iov->iov_base;
3285         char *begin_of_buf = offset + (char *)iov->iov_base;
3286         char *end_of_buf = begin_of_buf + buffer_length;
3287
3288
3289         if (buffer_length < min_buf_size) {
3290                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3291                          buffer_length, min_buf_size);
3292                 return -EINVAL;
3293         }
3294
3295         /* check if beyond RFC1001 maximum length */
3296         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3297                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3298                          buffer_length, smb_len);
3299                 return -EINVAL;
3300         }
3301
3302         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3303                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3304                 return -EINVAL;
3305         }
3306
3307         return 0;
3308 }
3309
3310 /*
3311  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3312  * Caller must free buffer.
3313  */
3314 int
3315 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3316                            struct kvec *iov, unsigned int minbufsize,
3317                            char *data)
3318 {
3319         char *begin_of_buf = offset + (char *)iov->iov_base;
3320         int rc;
3321
3322         if (!data)
3323                 return -EINVAL;
3324
3325         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3326         if (rc)
3327                 return rc;
3328
3329         memcpy(data, begin_of_buf, buffer_length);
3330
3331         return 0;
3332 }
3333
3334 int
3335 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3336                      struct smb_rqst *rqst,
3337                      u64 persistent_fid, u64 volatile_fid,
3338                      u8 info_class, u8 info_type, u32 additional_info,
3339                      size_t output_len, size_t input_len, void *input)
3340 {
3341         struct smb2_query_info_req *req;
3342         struct kvec *iov = rqst->rq_iov;
3343         unsigned int total_len;
3344         int rc;
3345
3346         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3347                                  (void **) &req, &total_len);
3348         if (rc)
3349                 return rc;
3350
3351         req->InfoType = info_type;
3352         req->FileInfoClass = info_class;
3353         req->PersistentFileId = persistent_fid;
3354         req->VolatileFileId = volatile_fid;
3355         req->AdditionalInformation = cpu_to_le32(additional_info);
3356
3357         req->OutputBufferLength = cpu_to_le32(output_len);
3358         if (input_len) {
3359                 req->InputBufferLength = cpu_to_le32(input_len);
3360                 /* total_len for smb query request never close to le16 max */
3361                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3362                 memcpy(req->Buffer, input, input_len);
3363         }
3364
3365         iov[0].iov_base = (char *)req;
3366         /* 1 for Buffer */
3367         iov[0].iov_len = total_len - 1 + input_len;
3368         return 0;
3369 }
3370
3371 void
3372 SMB2_query_info_free(struct smb_rqst *rqst)
3373 {
3374         if (rqst && rqst->rq_iov)
3375                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3376 }
3377
3378 static int
3379 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3380            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3381            u32 additional_info, size_t output_len, size_t min_len, void **data,
3382                 u32 *dlen)
3383 {
3384         struct smb_rqst rqst;
3385         struct smb2_query_info_rsp *rsp = NULL;
3386         struct kvec iov[1];
3387         struct kvec rsp_iov;
3388         int rc = 0;
3389         int resp_buftype = CIFS_NO_BUFFER;
3390         struct cifs_ses *ses = tcon->ses;
3391         struct TCP_Server_Info *server;
3392         int flags = 0;
3393         bool allocated = false;
3394
3395         cifs_dbg(FYI, "Query Info\n");
3396
3397         if (!ses)
3398                 return -EIO;
3399         server = cifs_pick_channel(ses);
3400         if (!server)
3401                 return -EIO;
3402
3403         if (smb3_encryption_required(tcon))
3404                 flags |= CIFS_TRANSFORM_REQ;
3405
3406         memset(&rqst, 0, sizeof(struct smb_rqst));
3407         memset(&iov, 0, sizeof(iov));
3408         rqst.rq_iov = iov;
3409         rqst.rq_nvec = 1;
3410
3411         rc = SMB2_query_info_init(tcon, server,
3412                                   &rqst, persistent_fid, volatile_fid,
3413                                   info_class, info_type, additional_info,
3414                                   output_len, 0, NULL);
3415         if (rc)
3416                 goto qinf_exit;
3417
3418         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3419                                     ses->Suid, info_class, (__u32)info_type);
3420
3421         rc = cifs_send_recv(xid, ses, server,
3422                             &rqst, &resp_buftype, flags, &rsp_iov);
3423         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3424
3425         if (rc) {
3426                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3427                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3428                                 ses->Suid, info_class, (__u32)info_type, rc);
3429                 goto qinf_exit;
3430         }
3431
3432         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3433                                 ses->Suid, info_class, (__u32)info_type);
3434
3435         if (dlen) {
3436                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3437                 if (!*data) {
3438                         *data = kmalloc(*dlen, GFP_KERNEL);
3439                         if (!*data) {
3440                                 cifs_tcon_dbg(VFS,
3441                                         "Error %d allocating memory for acl\n",
3442                                         rc);
3443                                 *dlen = 0;
3444                                 rc = -ENOMEM;
3445                                 goto qinf_exit;
3446                         }
3447                         allocated = true;
3448                 }
3449         }
3450
3451         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3452                                         le32_to_cpu(rsp->OutputBufferLength),
3453                                         &rsp_iov, min_len, *data);
3454         if (rc && allocated) {
3455                 kfree(*data);
3456                 *data = NULL;
3457                 *dlen = 0;
3458         }
3459
3460 qinf_exit:
3461         SMB2_query_info_free(&rqst);
3462         free_rsp_buf(resp_buftype, rsp);
3463         return rc;
3464 }
3465
3466 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3467         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3468 {
3469         return query_info(xid, tcon, persistent_fid, volatile_fid,
3470                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3471                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3472                           sizeof(struct smb2_file_all_info), (void **)&data,
3473                           NULL);
3474 }
3475
3476 #if 0
3477 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3478 int
3479 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3480                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3481 {
3482         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3483                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3484         *plen = 0;
3485
3486         return query_info(xid, tcon, persistent_fid, volatile_fid,
3487                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3488                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3489         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3490 }
3491 #endif
3492
3493 int
3494 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3495                u64 persistent_fid, u64 volatile_fid,
3496                void **data, u32 *plen, u32 extra_info)
3497 {
3498         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3499                                 extra_info;
3500         *plen = 0;
3501
3502         return query_info(xid, tcon, persistent_fid, volatile_fid,
3503                           0, SMB2_O_INFO_SECURITY, additional_info,
3504                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3505 }
3506
3507 int
3508 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3509                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3510 {
3511         return query_info(xid, tcon, persistent_fid, volatile_fid,
3512                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3513                           sizeof(struct smb2_file_internal_info),
3514                           sizeof(struct smb2_file_internal_info),
3515                           (void **)&uniqueid, NULL);
3516 }
3517
3518 /*
3519  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3520  * See MS-SMB2 2.2.35 and 2.2.36
3521  */
3522
3523 static int
3524 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3525                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3526                  u64 persistent_fid, u64 volatile_fid,
3527                  u32 completion_filter, bool watch_tree)
3528 {
3529         struct smb2_change_notify_req *req;
3530         struct kvec *iov = rqst->rq_iov;
3531         unsigned int total_len;
3532         int rc;
3533
3534         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3535                                  (void **) &req, &total_len);
3536         if (rc)
3537                 return rc;
3538
3539         req->PersistentFileId = persistent_fid;
3540         req->VolatileFileId = volatile_fid;
3541         /* See note 354 of MS-SMB2, 64K max */
3542         req->OutputBufferLength =
3543                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3544         req->CompletionFilter = cpu_to_le32(completion_filter);
3545         if (watch_tree)
3546                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3547         else
3548                 req->Flags = 0;
3549
3550         iov[0].iov_base = (char *)req;
3551         iov[0].iov_len = total_len;
3552
3553         return 0;
3554 }
3555
3556 int
3557 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3558                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3559                 u32 completion_filter)
3560 {
3561         struct cifs_ses *ses = tcon->ses;
3562         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3563         struct smb_rqst rqst;
3564         struct kvec iov[1];
3565         struct kvec rsp_iov = {NULL, 0};
3566         int resp_buftype = CIFS_NO_BUFFER;
3567         int flags = 0;
3568         int rc = 0;
3569
3570         cifs_dbg(FYI, "change notify\n");
3571         if (!ses || !server)
3572                 return -EIO;
3573
3574         if (smb3_encryption_required(tcon))
3575                 flags |= CIFS_TRANSFORM_REQ;
3576
3577         memset(&rqst, 0, sizeof(struct smb_rqst));
3578         memset(&iov, 0, sizeof(iov));
3579         rqst.rq_iov = iov;
3580         rqst.rq_nvec = 1;
3581
3582         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3583                               persistent_fid, volatile_fid,
3584                               completion_filter, watch_tree);
3585         if (rc)
3586                 goto cnotify_exit;
3587
3588         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3589                                 (u8)watch_tree, completion_filter);
3590         rc = cifs_send_recv(xid, ses, server,
3591                             &rqst, &resp_buftype, flags, &rsp_iov);
3592
3593         if (rc != 0) {
3594                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3595                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3596                                 (u8)watch_tree, completion_filter, rc);
3597         } else
3598                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3599                                 ses->Suid, (u8)watch_tree, completion_filter);
3600
3601  cnotify_exit:
3602         if (rqst.rq_iov)
3603                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3604         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3605         return rc;
3606 }
3607
3608
3609
3610 /*
3611  * This is a no-op for now. We're not really interested in the reply, but
3612  * rather in the fact that the server sent one and that server->lstrp
3613  * gets updated.
3614  *
3615  * FIXME: maybe we should consider checking that the reply matches request?
3616  */
3617 static void
3618 smb2_echo_callback(struct mid_q_entry *mid)
3619 {
3620         struct TCP_Server_Info *server = mid->callback_data;
3621         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3622         struct cifs_credits credits = { .value = 0, .instance = 0 };
3623
3624         if (mid->mid_state == MID_RESPONSE_RECEIVED
3625             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3626                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3627                 credits.instance = server->reconnect_instance;
3628         }
3629
3630         DeleteMidQEntry(mid);
3631         add_credits(server, &credits, CIFS_ECHO_OP);
3632 }
3633
3634 void smb2_reconnect_server(struct work_struct *work)
3635 {
3636         struct TCP_Server_Info *server = container_of(work,
3637                                         struct TCP_Server_Info, reconnect.work);
3638         struct cifs_ses *ses;
3639         struct cifs_tcon *tcon, *tcon2;
3640         struct list_head tmp_list;
3641         int tcon_exist = false;
3642         int rc;
3643         int resched = false;
3644
3645
3646         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3647         mutex_lock(&server->reconnect_mutex);
3648
3649         INIT_LIST_HEAD(&tmp_list);
3650         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3651
3652         spin_lock(&cifs_tcp_ses_lock);
3653         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3654                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3655                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3656                                 tcon->tc_count++;
3657                                 list_add_tail(&tcon->rlist, &tmp_list);
3658                                 tcon_exist = true;
3659                         }
3660                 }
3661                 /*
3662                  * IPC has the same lifetime as its session and uses its
3663                  * refcount.
3664                  */
3665                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3666                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3667                         tcon_exist = true;
3668                         ses->ses_count++;
3669                 }
3670         }
3671         /*
3672          * Get the reference to server struct to be sure that the last call of
3673          * cifs_put_tcon() in the loop below won't release the server pointer.
3674          */
3675         if (tcon_exist)
3676                 server->srv_count++;
3677
3678         spin_unlock(&cifs_tcp_ses_lock);
3679
3680         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3681                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3682                 if (!rc)
3683                         cifs_reopen_persistent_handles(tcon);
3684                 else
3685                         resched = true;
3686                 list_del_init(&tcon->rlist);
3687                 if (tcon->ipc)
3688                         cifs_put_smb_ses(tcon->ses);
3689                 else
3690                         cifs_put_tcon(tcon);
3691         }
3692
3693         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3694         if (resched)
3695                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3696         mutex_unlock(&server->reconnect_mutex);
3697
3698         /* now we can safely release srv struct */
3699         if (tcon_exist)
3700                 cifs_put_tcp_session(server, 1);
3701 }
3702
3703 int
3704 SMB2_echo(struct TCP_Server_Info *server)
3705 {
3706         struct smb2_echo_req *req;
3707         int rc = 0;
3708         struct kvec iov[1];
3709         struct smb_rqst rqst = { .rq_iov = iov,
3710                                  .rq_nvec = 1 };
3711         unsigned int total_len;
3712
3713         cifs_dbg(FYI, "In echo request\n");
3714
3715         if (server->tcpStatus == CifsNeedNegotiate) {
3716                 /* No need to send echo on newly established connections */
3717                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3718                 return rc;
3719         }
3720
3721         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3722                                  (void **)&req, &total_len);
3723         if (rc)
3724                 return rc;
3725
3726         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3727
3728         iov[0].iov_len = total_len;
3729         iov[0].iov_base = (char *)req;
3730
3731         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3732                              server, CIFS_ECHO_OP, NULL);
3733         if (rc)
3734                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3735
3736         cifs_small_buf_release(req);
3737         return rc;
3738 }
3739
3740 void
3741 SMB2_flush_free(struct smb_rqst *rqst)
3742 {
3743         if (rqst && rqst->rq_iov)
3744                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3745 }
3746
3747 int
3748 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3749                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3750                 u64 persistent_fid, u64 volatile_fid)
3751 {
3752         struct smb2_flush_req *req;
3753         struct kvec *iov = rqst->rq_iov;
3754         unsigned int total_len;
3755         int rc;
3756
3757         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3758                                  (void **) &req, &total_len);
3759         if (rc)
3760                 return rc;
3761
3762         req->PersistentFileId = persistent_fid;
3763         req->VolatileFileId = volatile_fid;
3764
3765         iov[0].iov_base = (char *)req;
3766         iov[0].iov_len = total_len;
3767
3768         return 0;
3769 }
3770
3771 int
3772 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3773            u64 volatile_fid)
3774 {
3775         struct cifs_ses *ses = tcon->ses;
3776         struct smb_rqst rqst;
3777         struct kvec iov[1];
3778         struct kvec rsp_iov = {NULL, 0};
3779         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3780         int resp_buftype = CIFS_NO_BUFFER;
3781         int flags = 0;
3782         int rc = 0;
3783
3784         cifs_dbg(FYI, "flush\n");
3785         if (!ses || !(ses->server))
3786                 return -EIO;
3787
3788         if (smb3_encryption_required(tcon))
3789                 flags |= CIFS_TRANSFORM_REQ;
3790
3791         memset(&rqst, 0, sizeof(struct smb_rqst));
3792         memset(&iov, 0, sizeof(iov));
3793         rqst.rq_iov = iov;
3794         rqst.rq_nvec = 1;
3795
3796         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3797                              persistent_fid, volatile_fid);
3798         if (rc)
3799                 goto flush_exit;
3800
3801         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3802         rc = cifs_send_recv(xid, ses, server,
3803                             &rqst, &resp_buftype, flags, &rsp_iov);
3804
3805         if (rc != 0) {
3806                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3807                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3808                                      rc);
3809         } else
3810                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3811                                       ses->Suid);
3812
3813  flush_exit:
3814         SMB2_flush_free(&rqst);
3815         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3816         return rc;
3817 }
3818
3819 /*
3820  * To form a chain of read requests, any read requests after the first should
3821  * have the end_of_chain boolean set to true.
3822  */
3823 static int
3824 smb2_new_read_req(void **buf, unsigned int *total_len,
3825         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3826         unsigned int remaining_bytes, int request_type)
3827 {
3828         int rc = -EACCES;
3829         struct smb2_read_plain_req *req = NULL;
3830         struct smb2_sync_hdr *shdr;
3831         struct TCP_Server_Info *server = io_parms->server;
3832
3833         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3834                                  (void **) &req, total_len);
3835         if (rc)
3836                 return rc;
3837
3838         if (server == NULL)
3839                 return -ECONNABORTED;
3840
3841         shdr = &req->sync_hdr;
3842         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3843
3844         req->PersistentFileId = io_parms->persistent_fid;
3845         req->VolatileFileId = io_parms->volatile_fid;
3846         req->ReadChannelInfoOffset = 0; /* reserved */
3847         req->ReadChannelInfoLength = 0; /* reserved */
3848         req->Channel = 0; /* reserved */
3849         req->MinimumCount = 0;
3850         req->Length = cpu_to_le32(io_parms->length);
3851         req->Offset = cpu_to_le64(io_parms->offset);
3852
3853         trace_smb3_read_enter(0 /* xid */,
3854                         io_parms->persistent_fid,
3855                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3856                         io_parms->offset, io_parms->length);
3857 #ifdef CONFIG_CIFS_SMB_DIRECT
3858         /*
3859          * If we want to do a RDMA write, fill in and append
3860          * smbd_buffer_descriptor_v1 to the end of read request
3861          */
3862         if (server->rdma && rdata && !server->sign &&
3863                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3864
3865                 struct smbd_buffer_descriptor_v1 *v1;
3866                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3867
3868                 rdata->mr = smbd_register_mr(
3869                                 server->smbd_conn, rdata->pages,
3870                                 rdata->nr_pages, rdata->page_offset,
3871                                 rdata->tailsz, true, need_invalidate);
3872                 if (!rdata->mr)
3873                         return -EAGAIN;
3874
3875                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3876                 if (need_invalidate)
3877                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3878                 req->ReadChannelInfoOffset =
3879                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3880                 req->ReadChannelInfoLength =
3881                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3882                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3883                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3884                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3885                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3886
3887                 *total_len += sizeof(*v1) - 1;
3888         }
3889 #endif
3890         if (request_type & CHAINED_REQUEST) {
3891                 if (!(request_type & END_OF_CHAIN)) {
3892                         /* next 8-byte aligned request */
3893                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3894                         shdr->NextCommand = cpu_to_le32(*total_len);
3895                 } else /* END_OF_CHAIN */
3896                         shdr->NextCommand = 0;
3897                 if (request_type & RELATED_REQUEST) {
3898                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3899                         /*
3900                          * Related requests use info from previous read request
3901                          * in chain.
3902                          */
3903                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3904                         shdr->TreeId = 0xFFFFFFFF;
3905                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3906                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3907                 }
3908         }
3909         if (remaining_bytes > io_parms->length)
3910                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3911         else
3912                 req->RemainingBytes = 0;
3913
3914         *buf = req;
3915         return rc;
3916 }
3917
3918 static void
3919 smb2_readv_callback(struct mid_q_entry *mid)
3920 {
3921         struct cifs_readdata *rdata = mid->callback_data;
3922         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3923         struct TCP_Server_Info *server = rdata->server;
3924         struct smb2_sync_hdr *shdr =
3925                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3926         struct cifs_credits credits = { .value = 0, .instance = 0 };
3927         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3928                                  .rq_nvec = 1,
3929                                  .rq_pages = rdata->pages,
3930                                  .rq_offset = rdata->page_offset,
3931                                  .rq_npages = rdata->nr_pages,
3932                                  .rq_pagesz = rdata->pagesz,
3933                                  .rq_tailsz = rdata->tailsz };
3934
3935         WARN_ONCE(rdata->server != mid->server,
3936                   "rdata server %p != mid server %p",
3937                   rdata->server, mid->server);
3938
3939         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3940                  __func__, mid->mid, mid->mid_state, rdata->result,
3941                  rdata->bytes);
3942
3943         switch (mid->mid_state) {
3944         case MID_RESPONSE_RECEIVED:
3945                 credits.value = le16_to_cpu(shdr->CreditRequest);
3946                 credits.instance = server->reconnect_instance;
3947                 /* result already set, check signature */
3948                 if (server->sign && !mid->decrypted) {
3949                         int rc;
3950
3951                         rc = smb2_verify_signature(&rqst, server);
3952                         if (rc)
3953                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3954                                          rc);
3955                 }
3956                 /* FIXME: should this be counted toward the initiating task? */
3957                 task_io_account_read(rdata->got_bytes);
3958                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3959                 break;
3960         case MID_REQUEST_SUBMITTED:
3961         case MID_RETRY_NEEDED:
3962                 rdata->result = -EAGAIN;
3963                 if (server->sign && rdata->got_bytes)
3964                         /* reset bytes number since we can not check a sign */
3965                         rdata->got_bytes = 0;
3966                 /* FIXME: should this be counted toward the initiating task? */
3967                 task_io_account_read(rdata->got_bytes);
3968                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3969                 break;
3970         case MID_RESPONSE_MALFORMED:
3971                 credits.value = le16_to_cpu(shdr->CreditRequest);
3972                 credits.instance = server->reconnect_instance;
3973                 fallthrough;
3974         default:
3975                 rdata->result = -EIO;
3976         }
3977 #ifdef CONFIG_CIFS_SMB_DIRECT
3978         /*
3979          * If this rdata has a memmory registered, the MR can be freed
3980          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3981          * because they have limited number and are used for future I/Os
3982          */
3983         if (rdata->mr) {
3984                 smbd_deregister_mr(rdata->mr);
3985                 rdata->mr = NULL;
3986         }
3987 #endif
3988         if (rdata->result && rdata->result != -ENODATA) {
3989                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3990                 trace_smb3_read_err(0 /* xid */,
3991                                     rdata->cfile->fid.persistent_fid,
3992                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3993                                     rdata->bytes, rdata->result);
3994         } else
3995                 trace_smb3_read_done(0 /* xid */,
3996                                      rdata->cfile->fid.persistent_fid,
3997                                      tcon->tid, tcon->ses->Suid,
3998                                      rdata->offset, rdata->got_bytes);
3999
4000         queue_work(cifsiod_wq, &rdata->work);
4001         DeleteMidQEntry(mid);
4002         add_credits(server, &credits, 0);
4003 }
4004
4005 /* smb2_async_readv - send an async read, and set up mid to handle result */
4006 int
4007 smb2_async_readv(struct cifs_readdata *rdata)
4008 {
4009         int rc, flags = 0;
4010         char *buf;
4011         struct smb2_sync_hdr *shdr;
4012         struct cifs_io_parms io_parms;
4013         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4014                                  .rq_nvec = 1 };
4015         struct TCP_Server_Info *server;
4016         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4017         unsigned int total_len;
4018
4019         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4020                  __func__, rdata->offset, rdata->bytes);
4021
4022         if (!rdata->server)
4023                 rdata->server = cifs_pick_channel(tcon->ses);
4024
4025         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4026         io_parms.server = server = rdata->server;
4027         io_parms.offset = rdata->offset;
4028         io_parms.length = rdata->bytes;
4029         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4030         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4031         io_parms.pid = rdata->pid;
4032
4033         rc = smb2_new_read_req(
4034                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4035         if (rc)
4036                 return rc;
4037
4038         if (smb3_encryption_required(io_parms.tcon))
4039                 flags |= CIFS_TRANSFORM_REQ;
4040
4041         rdata->iov[0].iov_base = buf;
4042         rdata->iov[0].iov_len = total_len;
4043
4044         shdr = (struct smb2_sync_hdr *)buf;
4045
4046         if (rdata->credits.value > 0) {
4047                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4048                                                 SMB2_MAX_BUFFER_SIZE));
4049                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4050
4051                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4052                 if (rc)
4053                         goto async_readv_out;
4054
4055                 flags |= CIFS_HAS_CREDITS;
4056         }
4057
4058         kref_get(&rdata->refcount);
4059         rc = cifs_call_async(server, &rqst,
4060                              cifs_readv_receive, smb2_readv_callback,
4061                              smb3_handle_read_data, rdata, flags,
4062                              &rdata->credits);
4063         if (rc) {
4064                 kref_put(&rdata->refcount, cifs_readdata_release);
4065                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4066                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4067                                     io_parms.tcon->tid,
4068                                     io_parms.tcon->ses->Suid,
4069                                     io_parms.offset, io_parms.length, rc);
4070         }
4071
4072 async_readv_out:
4073         cifs_small_buf_release(buf);
4074         return rc;
4075 }
4076
4077 int
4078 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4079           unsigned int *nbytes, char **buf, int *buf_type)
4080 {
4081         struct smb_rqst rqst;
4082         int resp_buftype, rc;
4083         struct smb2_read_plain_req *req = NULL;
4084         struct smb2_read_rsp *rsp = NULL;
4085         struct kvec iov[1];
4086         struct kvec rsp_iov;
4087         unsigned int total_len;
4088         int flags = CIFS_LOG_ERROR;
4089         struct cifs_ses *ses = io_parms->tcon->ses;
4090
4091         if (!io_parms->server)
4092                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4093
4094         *nbytes = 0;
4095         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4096         if (rc)
4097                 return rc;
4098
4099         if (smb3_encryption_required(io_parms->tcon))
4100                 flags |= CIFS_TRANSFORM_REQ;
4101
4102         iov[0].iov_base = (char *)req;
4103         iov[0].iov_len = total_len;
4104
4105         memset(&rqst, 0, sizeof(struct smb_rqst));
4106         rqst.rq_iov = iov;
4107         rqst.rq_nvec = 1;
4108
4109         rc = cifs_send_recv(xid, ses, io_parms->server,
4110                             &rqst, &resp_buftype, flags, &rsp_iov);
4111         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4112
4113         if (rc) {
4114                 if (rc != -ENODATA) {
4115                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4116                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4117                         trace_smb3_read_err(xid, req->PersistentFileId,
4118                                             io_parms->tcon->tid, ses->Suid,
4119                                             io_parms->offset, io_parms->length,
4120                                             rc);
4121                 } else
4122                         trace_smb3_read_done(xid, req->PersistentFileId,
4123                                     io_parms->tcon->tid, ses->Suid,
4124                                     io_parms->offset, 0);
4125                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4126                 cifs_small_buf_release(req);
4127                 return rc == -ENODATA ? 0 : rc;
4128         } else
4129                 trace_smb3_read_done(xid, req->PersistentFileId,
4130                                     io_parms->tcon->tid, ses->Suid,
4131                                     io_parms->offset, io_parms->length);
4132
4133         cifs_small_buf_release(req);
4134
4135         *nbytes = le32_to_cpu(rsp->DataLength);
4136         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4137             (*nbytes > io_parms->length)) {
4138                 cifs_dbg(FYI, "bad length %d for count %d\n",
4139                          *nbytes, io_parms->length);
4140                 rc = -EIO;
4141                 *nbytes = 0;
4142         }
4143
4144         if (*buf) {
4145                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4146                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4147         } else if (resp_buftype != CIFS_NO_BUFFER) {
4148                 *buf = rsp_iov.iov_base;
4149                 if (resp_buftype == CIFS_SMALL_BUFFER)
4150                         *buf_type = CIFS_SMALL_BUFFER;
4151                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4152                         *buf_type = CIFS_LARGE_BUFFER;
4153         }
4154         return rc;
4155 }
4156
4157 /*
4158  * Check the mid_state and signature on received buffer (if any), and queue the
4159  * workqueue completion task.
4160  */
4161 static void
4162 smb2_writev_callback(struct mid_q_entry *mid)
4163 {
4164         struct cifs_writedata *wdata = mid->callback_data;
4165         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4166         struct TCP_Server_Info *server = wdata->server;
4167         unsigned int written;
4168         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4169         struct cifs_credits credits = { .value = 0, .instance = 0 };
4170
4171         WARN_ONCE(wdata->server != mid->server,
4172                   "wdata server %p != mid server %p",
4173                   wdata->server, mid->server);
4174
4175         switch (mid->mid_state) {
4176         case MID_RESPONSE_RECEIVED:
4177                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4178                 credits.instance = server->reconnect_instance;
4179                 wdata->result = smb2_check_receive(mid, server, 0);
4180                 if (wdata->result != 0)
4181                         break;
4182
4183                 written = le32_to_cpu(rsp->DataLength);
4184                 /*
4185                  * Mask off high 16 bits when bytes written as returned
4186                  * by the server is greater than bytes requested by the
4187                  * client. OS/2 servers are known to set incorrect
4188                  * CountHigh values.
4189                  */
4190                 if (written > wdata->bytes)
4191                         written &= 0xFFFF;
4192
4193                 if (written < wdata->bytes)
4194                         wdata->result = -ENOSPC;
4195                 else
4196                         wdata->bytes = written;
4197                 break;
4198         case MID_REQUEST_SUBMITTED:
4199         case MID_RETRY_NEEDED:
4200                 wdata->result = -EAGAIN;
4201                 break;
4202         case MID_RESPONSE_MALFORMED:
4203                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4204                 credits.instance = server->reconnect_instance;
4205                 fallthrough;
4206         default:
4207                 wdata->result = -EIO;
4208                 break;
4209         }
4210 #ifdef CONFIG_CIFS_SMB_DIRECT
4211         /*
4212          * If this wdata has a memory registered, the MR can be freed
4213          * The number of MRs available is limited, it's important to recover
4214          * used MR as soon as I/O is finished. Hold MR longer in the later
4215          * I/O process can possibly result in I/O deadlock due to lack of MR
4216          * to send request on I/O retry
4217          */
4218         if (wdata->mr) {
4219                 smbd_deregister_mr(wdata->mr);
4220                 wdata->mr = NULL;
4221         }
4222 #endif
4223         if (wdata->result) {
4224                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4225                 trace_smb3_write_err(0 /* no xid */,
4226                                      wdata->cfile->fid.persistent_fid,
4227                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4228                                      wdata->bytes, wdata->result);
4229                 if (wdata->result == -ENOSPC)
4230                         pr_warn_once("Out of space writing to %s\n",
4231                                      tcon->treeName);
4232         } else
4233                 trace_smb3_write_done(0 /* no xid */,
4234                                       wdata->cfile->fid.persistent_fid,
4235                                       tcon->tid, tcon->ses->Suid,
4236                                       wdata->offset, wdata->bytes);
4237
4238         queue_work(cifsiod_wq, &wdata->work);
4239         DeleteMidQEntry(mid);
4240         add_credits(server, &credits, 0);
4241 }
4242
4243 /* smb2_async_writev - send an async write, and set up mid to handle result */
4244 int
4245 smb2_async_writev(struct cifs_writedata *wdata,
4246                   void (*release)(struct kref *kref))
4247 {
4248         int rc = -EACCES, flags = 0;
4249         struct smb2_write_req *req = NULL;
4250         struct smb2_sync_hdr *shdr;
4251         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4252         struct TCP_Server_Info *server = wdata->server;
4253         struct kvec iov[1];
4254         struct smb_rqst rqst = { };
4255         unsigned int total_len;
4256
4257         if (!wdata->server)
4258                 server = wdata->server = cifs_pick_channel(tcon->ses);
4259
4260         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4261                                  (void **) &req, &total_len);
4262         if (rc)
4263                 return rc;
4264
4265         if (smb3_encryption_required(tcon))
4266                 flags |= CIFS_TRANSFORM_REQ;
4267
4268         shdr = (struct smb2_sync_hdr *)req;
4269         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4270
4271         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4272         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4273         req->WriteChannelInfoOffset = 0;
4274         req->WriteChannelInfoLength = 0;
4275         req->Channel = 0;
4276         req->Offset = cpu_to_le64(wdata->offset);
4277         req->DataOffset = cpu_to_le16(
4278                                 offsetof(struct smb2_write_req, Buffer));
4279         req->RemainingBytes = 0;
4280
4281         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4282                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4283 #ifdef CONFIG_CIFS_SMB_DIRECT
4284         /*
4285          * If we want to do a server RDMA read, fill in and append
4286          * smbd_buffer_descriptor_v1 to the end of write request
4287          */
4288         if (server->rdma && !server->sign && wdata->bytes >=
4289                 server->smbd_conn->rdma_readwrite_threshold) {
4290
4291                 struct smbd_buffer_descriptor_v1 *v1;
4292                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4293
4294                 wdata->mr = smbd_register_mr(
4295                                 server->smbd_conn, wdata->pages,
4296                                 wdata->nr_pages, wdata->page_offset,
4297                                 wdata->tailsz, false, need_invalidate);
4298                 if (!wdata->mr) {
4299                         rc = -EAGAIN;
4300                         goto async_writev_out;
4301                 }
4302                 req->Length = 0;
4303                 req->DataOffset = 0;
4304                 if (wdata->nr_pages > 1)
4305                         req->RemainingBytes =
4306                                 cpu_to_le32(
4307                                         (wdata->nr_pages - 1) * wdata->pagesz -
4308                                         wdata->page_offset + wdata->tailsz
4309                                 );
4310                 else
4311                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4312                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4313                 if (need_invalidate)
4314                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4315                 req->WriteChannelInfoOffset =
4316                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4317                 req->WriteChannelInfoLength =
4318                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4319                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4320                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4321                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4322                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4323         }
4324 #endif
4325         iov[0].iov_len = total_len - 1;
4326         iov[0].iov_base = (char *)req;
4327
4328         rqst.rq_iov = iov;
4329         rqst.rq_nvec = 1;
4330         rqst.rq_pages = wdata->pages;
4331         rqst.rq_offset = wdata->page_offset;
4332         rqst.rq_npages = wdata->nr_pages;
4333         rqst.rq_pagesz = wdata->pagesz;
4334         rqst.rq_tailsz = wdata->tailsz;
4335 #ifdef CONFIG_CIFS_SMB_DIRECT
4336         if (wdata->mr) {
4337                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4338                 rqst.rq_npages = 0;
4339         }
4340 #endif
4341         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4342                  wdata->offset, wdata->bytes);
4343
4344 #ifdef CONFIG_CIFS_SMB_DIRECT
4345         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4346         if (!wdata->mr)
4347                 req->Length = cpu_to_le32(wdata->bytes);
4348 #else
4349         req->Length = cpu_to_le32(wdata->bytes);
4350 #endif
4351
4352         if (wdata->credits.value > 0) {
4353                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4354                                                     SMB2_MAX_BUFFER_SIZE));
4355                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4356
4357                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4358                 if (rc)
4359                         goto async_writev_out;
4360
4361                 flags |= CIFS_HAS_CREDITS;
4362         }
4363
4364         kref_get(&wdata->refcount);
4365         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4366                              wdata, flags, &wdata->credits);
4367
4368         if (rc) {
4369                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4370                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4371                                      wdata->bytes, rc);
4372                 kref_put(&wdata->refcount, release);
4373                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4374         }
4375
4376 async_writev_out:
4377         cifs_small_buf_release(req);
4378         return rc;
4379 }
4380
4381 /*
4382  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4383  * The length field from io_parms must be at least 1 and indicates a number of
4384  * elements with data to write that begins with position 1 in iov array. All
4385  * data length is specified by count.
4386  */
4387 int
4388 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4389            unsigned int *nbytes, struct kvec *iov, int n_vec)
4390 {
4391         struct smb_rqst rqst;
4392         int rc = 0;
4393         struct smb2_write_req *req = NULL;
4394         struct smb2_write_rsp *rsp = NULL;
4395         int resp_buftype;
4396         struct kvec rsp_iov;
4397         int flags = 0;
4398         unsigned int total_len;
4399         struct TCP_Server_Info *server;
4400
4401         *nbytes = 0;
4402
4403         if (n_vec < 1)
4404                 return rc;
4405
4406         if (!io_parms->server)
4407                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4408         server = io_parms->server;
4409         if (server == NULL)
4410                 return -ECONNABORTED;
4411
4412         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4413                                  (void **) &req, &total_len);
4414         if (rc)
4415                 return rc;
4416
4417         if (smb3_encryption_required(io_parms->tcon))
4418                 flags |= CIFS_TRANSFORM_REQ;
4419
4420         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4421
4422         req->PersistentFileId = io_parms->persistent_fid;
4423         req->VolatileFileId = io_parms->volatile_fid;
4424         req->WriteChannelInfoOffset = 0;
4425         req->WriteChannelInfoLength = 0;
4426         req->Channel = 0;
4427         req->Length = cpu_to_le32(io_parms->length);
4428         req->Offset = cpu_to_le64(io_parms->offset);
4429         req->DataOffset = cpu_to_le16(
4430                                 offsetof(struct smb2_write_req, Buffer));
4431         req->RemainingBytes = 0;
4432
4433         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4434                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4435                 io_parms->offset, io_parms->length);
4436
4437         iov[0].iov_base = (char *)req;
4438         /* 1 for Buffer */
4439         iov[0].iov_len = total_len - 1;
4440
4441         memset(&rqst, 0, sizeof(struct smb_rqst));
4442         rqst.rq_iov = iov;
4443         rqst.rq_nvec = n_vec + 1;
4444
4445         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4446                             &rqst,
4447                             &resp_buftype, flags, &rsp_iov);
4448         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4449
4450         if (rc) {
4451                 trace_smb3_write_err(xid, req->PersistentFileId,
4452                                      io_parms->tcon->tid,
4453                                      io_parms->tcon->ses->Suid,
4454                                      io_parms->offset, io_parms->length, rc);
4455                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4456                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4457         } else {
4458                 *nbytes = le32_to_cpu(rsp->DataLength);
4459                 trace_smb3_write_done(xid, req->PersistentFileId,
4460                                      io_parms->tcon->tid,
4461                                      io_parms->tcon->ses->Suid,
4462                                      io_parms->offset, *nbytes);
4463         }
4464
4465         cifs_small_buf_release(req);
4466         free_rsp_buf(resp_buftype, rsp);
4467         return rc;
4468 }
4469
4470 int posix_info_sid_size(const void *beg, const void *end)
4471 {
4472         size_t subauth;
4473         int total;
4474
4475         if (beg + 1 > end)
4476                 return -1;
4477
4478         subauth = *(u8 *)(beg+1);
4479         if (subauth < 1 || subauth > 15)
4480                 return -1;
4481
4482         total = 1 + 1 + 6 + 4*subauth;
4483         if (beg + total > end)
4484                 return -1;
4485
4486         return total;
4487 }
4488
4489 int posix_info_parse(const void *beg, const void *end,
4490                      struct smb2_posix_info_parsed *out)
4491
4492 {
4493         int total_len = 0;
4494         int owner_len, group_len;
4495         int name_len;
4496         const void *owner_sid;
4497         const void *group_sid;
4498         const void *name;
4499
4500         /* if no end bound given, assume payload to be correct */
4501         if (!end) {
4502                 const struct smb2_posix_info *p = beg;
4503
4504                 end = beg + le32_to_cpu(p->NextEntryOffset);
4505                 /* last element will have a 0 offset, pick a sensible bound */
4506                 if (end == beg)
4507                         end += 0xFFFF;
4508         }
4509
4510         /* check base buf */
4511         if (beg + sizeof(struct smb2_posix_info) > end)
4512                 return -1;
4513         total_len = sizeof(struct smb2_posix_info);
4514
4515         /* check owner sid */
4516         owner_sid = beg + total_len;
4517         owner_len = posix_info_sid_size(owner_sid, end);
4518         if (owner_len < 0)
4519                 return -1;
4520         total_len += owner_len;
4521
4522         /* check group sid */
4523         group_sid = beg + total_len;
4524         group_len = posix_info_sid_size(group_sid, end);
4525         if (group_len < 0)
4526                 return -1;
4527         total_len += group_len;
4528
4529         /* check name len */
4530         if (beg + total_len + 4 > end)
4531                 return -1;
4532         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4533         if (name_len < 1 || name_len > 0xFFFF)
4534                 return -1;
4535         total_len += 4;
4536
4537         /* check name */
4538         name = beg + total_len;
4539         if (name + name_len > end)
4540                 return -1;
4541         total_len += name_len;
4542
4543         if (out) {
4544                 out->base = beg;
4545                 out->size = total_len;
4546                 out->name_len = name_len;
4547                 out->name = name;
4548                 memcpy(&out->owner, owner_sid, owner_len);
4549                 memcpy(&out->group, group_sid, group_len);
4550         }
4551         return total_len;
4552 }
4553
4554 static int posix_info_extra_size(const void *beg, const void *end)
4555 {
4556         int len = posix_info_parse(beg, end, NULL);
4557
4558         if (len < 0)
4559                 return -1;
4560         return len - sizeof(struct smb2_posix_info);
4561 }
4562
4563 static unsigned int
4564 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4565             size_t size)
4566 {
4567         int len;
4568         unsigned int entrycount = 0;
4569         unsigned int next_offset = 0;
4570         char *entryptr;
4571         FILE_DIRECTORY_INFO *dir_info;
4572
4573         if (bufstart == NULL)
4574                 return 0;
4575
4576         entryptr = bufstart;
4577
4578         while (1) {
4579                 if (entryptr + next_offset < entryptr ||
4580                     entryptr + next_offset > end_of_buf ||
4581                     entryptr + next_offset + size > end_of_buf) {
4582                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4583                         break;
4584                 }
4585
4586                 entryptr = entryptr + next_offset;
4587                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4588
4589                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4590                         len = posix_info_extra_size(entryptr, end_of_buf);
4591                 else
4592                         len = le32_to_cpu(dir_info->FileNameLength);
4593
4594                 if (len < 0 ||
4595                     entryptr + len < entryptr ||
4596                     entryptr + len > end_of_buf ||
4597                     entryptr + len + size > end_of_buf) {
4598                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4599                                  end_of_buf);
4600                         break;
4601                 }
4602
4603                 *lastentry = entryptr;
4604                 entrycount++;
4605
4606                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4607                 if (!next_offset)
4608                         break;
4609         }
4610
4611         return entrycount;
4612 }
4613
4614 /*
4615  * Readdir/FindFirst
4616  */
4617 int SMB2_query_directory_init(const unsigned int xid,
4618                               struct cifs_tcon *tcon,
4619                               struct TCP_Server_Info *server,
4620                               struct smb_rqst *rqst,
4621                               u64 persistent_fid, u64 volatile_fid,
4622                               int index, int info_level)
4623 {
4624         struct smb2_query_directory_req *req;
4625         unsigned char *bufptr;
4626         __le16 asteriks = cpu_to_le16('*');
4627         unsigned int output_size = CIFSMaxBufSize -
4628                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4629                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4630         unsigned int total_len;
4631         struct kvec *iov = rqst->rq_iov;
4632         int len, rc;
4633
4634         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4635                                  (void **) &req, &total_len);
4636         if (rc)
4637                 return rc;
4638
4639         switch (info_level) {
4640         case SMB_FIND_FILE_DIRECTORY_INFO:
4641                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4642                 break;
4643         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4644                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4645                 break;
4646         case SMB_FIND_FILE_POSIX_INFO:
4647                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4648                 break;
4649         default:
4650                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4651                         info_level);
4652                 return -EINVAL;
4653         }
4654
4655         req->FileIndex = cpu_to_le32(index);
4656         req->PersistentFileId = persistent_fid;
4657         req->VolatileFileId = volatile_fid;
4658
4659         len = 0x2;
4660         bufptr = req->Buffer;
4661         memcpy(bufptr, &asteriks, len);
4662
4663         req->FileNameOffset =
4664                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4665         req->FileNameLength = cpu_to_le16(len);
4666         /*
4667          * BB could be 30 bytes or so longer if we used SMB2 specific
4668          * buffer lengths, but this is safe and close enough.
4669          */
4670         output_size = min_t(unsigned int, output_size, server->maxBuf);
4671         output_size = min_t(unsigned int, output_size, 2 << 15);
4672         req->OutputBufferLength = cpu_to_le32(output_size);
4673
4674         iov[0].iov_base = (char *)req;
4675         /* 1 for Buffer */
4676         iov[0].iov_len = total_len - 1;
4677
4678         iov[1].iov_base = (char *)(req->Buffer);
4679         iov[1].iov_len = len;
4680
4681         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4682                         tcon->ses->Suid, index, output_size);
4683
4684         return 0;
4685 }
4686
4687 void SMB2_query_directory_free(struct smb_rqst *rqst)
4688 {
4689         if (rqst && rqst->rq_iov) {
4690                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4691         }
4692 }
4693
4694 int
4695 smb2_parse_query_directory(struct cifs_tcon *tcon,
4696                            struct kvec *rsp_iov,
4697                            int resp_buftype,
4698                            struct cifs_search_info *srch_inf)
4699 {
4700         struct smb2_query_directory_rsp *rsp;
4701         size_t info_buf_size;
4702         char *end_of_smb;
4703         int rc;
4704
4705         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4706
4707         switch (srch_inf->info_level) {
4708         case SMB_FIND_FILE_DIRECTORY_INFO:
4709                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4710                 break;
4711         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4712                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4713                 break;
4714         case SMB_FIND_FILE_POSIX_INFO:
4715                 /* note that posix payload are variable size */
4716                 info_buf_size = sizeof(struct smb2_posix_info);
4717                 break;
4718         default:
4719                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4720                          srch_inf->info_level);
4721                 return -EINVAL;
4722         }
4723
4724         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4725                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4726                                info_buf_size);
4727         if (rc) {
4728                 cifs_tcon_dbg(VFS, "bad info payload");
4729                 return rc;
4730         }
4731
4732         srch_inf->unicode = true;
4733
4734         if (srch_inf->ntwrk_buf_start) {
4735                 if (srch_inf->smallBuf)
4736                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4737                 else
4738                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4739         }
4740         srch_inf->ntwrk_buf_start = (char *)rsp;
4741         srch_inf->srch_entries_start = srch_inf->last_entry =
4742                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4743         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4744
4745         srch_inf->entries_in_buffer = num_entries(
4746                 srch_inf->info_level,
4747                 srch_inf->srch_entries_start,
4748                 end_of_smb,
4749                 &srch_inf->last_entry,
4750                 info_buf_size);
4751
4752         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4753         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4754                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4755                  srch_inf->srch_entries_start, srch_inf->last_entry);
4756         if (resp_buftype == CIFS_LARGE_BUFFER)
4757                 srch_inf->smallBuf = false;
4758         else if (resp_buftype == CIFS_SMALL_BUFFER)
4759                 srch_inf->smallBuf = true;
4760         else
4761                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4762
4763         return 0;
4764 }
4765
4766 int
4767 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4768                      u64 persistent_fid, u64 volatile_fid, int index,
4769                      struct cifs_search_info *srch_inf)
4770 {
4771         struct smb_rqst rqst;
4772         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4773         struct smb2_query_directory_rsp *rsp = NULL;
4774         int resp_buftype = CIFS_NO_BUFFER;
4775         struct kvec rsp_iov;
4776         int rc = 0;
4777         struct cifs_ses *ses = tcon->ses;
4778         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4779         int flags = 0;
4780
4781         if (!ses || !(ses->server))
4782                 return -EIO;
4783
4784         if (smb3_encryption_required(tcon))
4785                 flags |= CIFS_TRANSFORM_REQ;
4786
4787         memset(&rqst, 0, sizeof(struct smb_rqst));
4788         memset(&iov, 0, sizeof(iov));
4789         rqst.rq_iov = iov;
4790         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4791
4792         rc = SMB2_query_directory_init(xid, tcon, server,
4793                                        &rqst, persistent_fid,
4794                                        volatile_fid, index,
4795                                        srch_inf->info_level);
4796         if (rc)
4797                 goto qdir_exit;
4798
4799         rc = cifs_send_recv(xid, ses, server,
4800                             &rqst, &resp_buftype, flags, &rsp_iov);
4801         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4802
4803         if (rc) {
4804                 if (rc == -ENODATA &&
4805                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4806                         trace_smb3_query_dir_done(xid, persistent_fid,
4807                                 tcon->tid, tcon->ses->Suid, index, 0);
4808                         srch_inf->endOfSearch = true;
4809                         rc = 0;
4810                 } else {
4811                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4812                                 tcon->ses->Suid, index, 0, rc);
4813                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4814                 }
4815                 goto qdir_exit;
4816         }
4817
4818         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4819                                         srch_inf);
4820         if (rc) {
4821                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4822                         tcon->ses->Suid, index, 0, rc);
4823                 goto qdir_exit;
4824         }
4825         resp_buftype = CIFS_NO_BUFFER;
4826
4827         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4828                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4829
4830 qdir_exit:
4831         SMB2_query_directory_free(&rqst);
4832         free_rsp_buf(resp_buftype, rsp);
4833         return rc;
4834 }
4835
4836 int
4837 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4838                    struct smb_rqst *rqst,
4839                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4840                    u8 info_class, u8 info_type, u32 additional_info,
4841                    void **data, unsigned int *size)
4842 {
4843         struct smb2_set_info_req *req;
4844         struct kvec *iov = rqst->rq_iov;
4845         unsigned int i, total_len;
4846         int rc;
4847
4848         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4849                                  (void **) &req, &total_len);
4850         if (rc)
4851                 return rc;
4852
4853         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4854         req->InfoType = info_type;
4855         req->FileInfoClass = info_class;
4856         req->PersistentFileId = persistent_fid;
4857         req->VolatileFileId = volatile_fid;
4858         req->AdditionalInformation = cpu_to_le32(additional_info);
4859
4860         req->BufferOffset =
4861                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4862         req->BufferLength = cpu_to_le32(*size);
4863
4864         memcpy(req->Buffer, *data, *size);
4865         total_len += *size;
4866
4867         iov[0].iov_base = (char *)req;
4868         /* 1 for Buffer */
4869         iov[0].iov_len = total_len - 1;
4870
4871         for (i = 1; i < rqst->rq_nvec; i++) {
4872                 le32_add_cpu(&req->BufferLength, size[i]);
4873                 iov[i].iov_base = (char *)data[i];
4874                 iov[i].iov_len = size[i];
4875         }
4876
4877         return 0;
4878 }
4879
4880 void
4881 SMB2_set_info_free(struct smb_rqst *rqst)
4882 {
4883         if (rqst && rqst->rq_iov)
4884                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4885 }
4886
4887 static int
4888 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4889                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4890                u8 info_type, u32 additional_info, unsigned int num,
4891                 void **data, unsigned int *size)
4892 {
4893         struct smb_rqst rqst;
4894         struct smb2_set_info_rsp *rsp = NULL;
4895         struct kvec *iov;
4896         struct kvec rsp_iov;
4897         int rc = 0;
4898         int resp_buftype;
4899         struct cifs_ses *ses = tcon->ses;
4900         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4901         int flags = 0;
4902
4903         if (!ses || !server)
4904                 return -EIO;
4905
4906         if (!num)
4907                 return -EINVAL;
4908
4909         if (smb3_encryption_required(tcon))
4910                 flags |= CIFS_TRANSFORM_REQ;
4911
4912         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4913         if (!iov)
4914                 return -ENOMEM;
4915
4916         memset(&rqst, 0, sizeof(struct smb_rqst));
4917         rqst.rq_iov = iov;
4918         rqst.rq_nvec = num;
4919
4920         rc = SMB2_set_info_init(tcon, server,
4921                                 &rqst, persistent_fid, volatile_fid, pid,
4922                                 info_class, info_type, additional_info,
4923                                 data, size);
4924         if (rc) {
4925                 kfree(iov);
4926                 return rc;
4927         }
4928
4929
4930         rc = cifs_send_recv(xid, ses, server,
4931                             &rqst, &resp_buftype, flags,
4932                             &rsp_iov);
4933         SMB2_set_info_free(&rqst);
4934         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4935
4936         if (rc != 0) {
4937                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4938                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4939                                 ses->Suid, info_class, (__u32)info_type, rc);
4940         }
4941
4942         free_rsp_buf(resp_buftype, rsp);
4943         kfree(iov);
4944         return rc;
4945 }
4946
4947 int
4948 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4949              u64 volatile_fid, u32 pid, __le64 *eof)
4950 {
4951         struct smb2_file_eof_info info;
4952         void *data;
4953         unsigned int size;
4954
4955         info.EndOfFile = *eof;
4956
4957         data = &info;
4958         size = sizeof(struct smb2_file_eof_info);
4959
4960         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4961                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4962                         0, 1, &data, &size);
4963 }
4964
4965 int
4966 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4967                 u64 persistent_fid, u64 volatile_fid,
4968                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4969 {
4970         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4971                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4972                         1, (void **)&pnntsd, &pacllen);
4973 }
4974
4975 int
4976 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4977             u64 persistent_fid, u64 volatile_fid,
4978             struct smb2_file_full_ea_info *buf, int len)
4979 {
4980         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4981                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4982                 0, 1, (void **)&buf, &len);
4983 }
4984
4985 int
4986 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4987                   const u64 persistent_fid, const u64 volatile_fid,
4988                   __u8 oplock_level)
4989 {
4990         struct smb_rqst rqst;
4991         int rc;
4992         struct smb2_oplock_break *req = NULL;
4993         struct cifs_ses *ses = tcon->ses;
4994         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4995         int flags = CIFS_OBREAK_OP;
4996         unsigned int total_len;
4997         struct kvec iov[1];
4998         struct kvec rsp_iov;
4999         int resp_buf_type;
5000
5001         cifs_dbg(FYI, "SMB2_oplock_break\n");
5002         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5003                                  (void **) &req, &total_len);
5004         if (rc)
5005                 return rc;
5006
5007         if (smb3_encryption_required(tcon))
5008                 flags |= CIFS_TRANSFORM_REQ;
5009
5010         req->VolatileFid = volatile_fid;
5011         req->PersistentFid = persistent_fid;
5012         req->OplockLevel = oplock_level;
5013         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5014
5015         flags |= CIFS_NO_RSP_BUF;
5016
5017         iov[0].iov_base = (char *)req;
5018         iov[0].iov_len = total_len;
5019
5020         memset(&rqst, 0, sizeof(struct smb_rqst));
5021         rqst.rq_iov = iov;
5022         rqst.rq_nvec = 1;
5023
5024         rc = cifs_send_recv(xid, ses, server,
5025                             &rqst, &resp_buf_type, flags, &rsp_iov);
5026         cifs_small_buf_release(req);
5027
5028         if (rc) {
5029                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5030                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5031         }
5032
5033         return rc;
5034 }
5035
5036 void
5037 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5038                              struct kstatfs *kst)
5039 {
5040         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5041                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5042         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5043         kst->f_bfree  = kst->f_bavail =
5044                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5045         return;
5046 }
5047
5048 static void
5049 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5050                         struct kstatfs *kst)
5051 {
5052         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5053         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5054         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5055         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5056                 kst->f_bavail = kst->f_bfree;
5057         else
5058                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5059         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5060                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5061         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5062                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5063
5064         return;
5065 }
5066
5067 static int
5068 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5069                    struct TCP_Server_Info *server,
5070                    int level, int outbuf_len, u64 persistent_fid,
5071                    u64 volatile_fid)
5072 {
5073         int rc;
5074         struct smb2_query_info_req *req;
5075         unsigned int total_len;
5076
5077         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5078
5079         if ((tcon->ses == NULL) || server == NULL)
5080                 return -EIO;
5081
5082         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5083                                  (void **) &req, &total_len);
5084         if (rc)
5085                 return rc;
5086
5087         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5088         req->FileInfoClass = level;
5089         req->PersistentFileId = persistent_fid;
5090         req->VolatileFileId = volatile_fid;
5091         /* 1 for pad */
5092         req->InputBufferOffset =
5093                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5094         req->OutputBufferLength = cpu_to_le32(
5095                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5096
5097         iov->iov_base = (char *)req;
5098         iov->iov_len = total_len;
5099         return 0;
5100 }
5101
5102 int
5103 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5104               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5105 {
5106         struct smb_rqst rqst;
5107         struct smb2_query_info_rsp *rsp = NULL;
5108         struct kvec iov;
5109         struct kvec rsp_iov;
5110         int rc = 0;
5111         int resp_buftype;
5112         struct cifs_ses *ses = tcon->ses;
5113         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5114         FILE_SYSTEM_POSIX_INFO *info = NULL;
5115         int flags = 0;
5116
5117         rc = build_qfs_info_req(&iov, tcon, server,
5118                                 FS_POSIX_INFORMATION,
5119                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5120                                 persistent_fid, volatile_fid);
5121         if (rc)
5122                 return rc;
5123
5124         if (smb3_encryption_required(tcon))
5125                 flags |= CIFS_TRANSFORM_REQ;
5126
5127         memset(&rqst, 0, sizeof(struct smb_rqst));
5128         rqst.rq_iov = &iov;
5129         rqst.rq_nvec = 1;
5130
5131         rc = cifs_send_recv(xid, ses, server,
5132                             &rqst, &resp_buftype, flags, &rsp_iov);
5133         cifs_small_buf_release(iov.iov_base);
5134         if (rc) {
5135                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5136                 goto posix_qfsinf_exit;
5137         }
5138         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5139
5140         info = (FILE_SYSTEM_POSIX_INFO *)(
5141                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5142         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5143                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5144                                sizeof(FILE_SYSTEM_POSIX_INFO));
5145         if (!rc)
5146                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5147
5148 posix_qfsinf_exit:
5149         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5150         return rc;
5151 }
5152
5153 int
5154 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5155               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5156 {
5157         struct smb_rqst rqst;
5158         struct smb2_query_info_rsp *rsp = NULL;
5159         struct kvec iov;
5160         struct kvec rsp_iov;
5161         int rc = 0;
5162         int resp_buftype;
5163         struct cifs_ses *ses = tcon->ses;
5164         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5165         struct smb2_fs_full_size_info *info = NULL;
5166         int flags = 0;
5167
5168         rc = build_qfs_info_req(&iov, tcon, server,
5169                                 FS_FULL_SIZE_INFORMATION,
5170                                 sizeof(struct smb2_fs_full_size_info),
5171                                 persistent_fid, volatile_fid);
5172         if (rc)
5173                 return rc;
5174
5175         if (smb3_encryption_required(tcon))
5176                 flags |= CIFS_TRANSFORM_REQ;
5177
5178         memset(&rqst, 0, sizeof(struct smb_rqst));
5179         rqst.rq_iov = &iov;
5180         rqst.rq_nvec = 1;
5181
5182         rc = cifs_send_recv(xid, ses, server,
5183                             &rqst, &resp_buftype, flags, &rsp_iov);
5184         cifs_small_buf_release(iov.iov_base);
5185         if (rc) {
5186                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5187                 goto qfsinf_exit;
5188         }
5189         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5190
5191         info = (struct smb2_fs_full_size_info *)(
5192                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5193         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5194                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5195                                sizeof(struct smb2_fs_full_size_info));
5196         if (!rc)
5197                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5198
5199 qfsinf_exit:
5200         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5201         return rc;
5202 }
5203
5204 int
5205 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5206               u64 persistent_fid, u64 volatile_fid, int level)
5207 {
5208         struct smb_rqst rqst;
5209         struct smb2_query_info_rsp *rsp = NULL;
5210         struct kvec iov;
5211         struct kvec rsp_iov;
5212         int rc = 0;
5213         int resp_buftype, max_len, min_len;
5214         struct cifs_ses *ses = tcon->ses;
5215         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5216         unsigned int rsp_len, offset;
5217         int flags = 0;
5218
5219         if (level == FS_DEVICE_INFORMATION) {
5220                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5221                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5222         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5223                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5224                 min_len = MIN_FS_ATTR_INFO_SIZE;
5225         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5226                 max_len = sizeof(struct smb3_fs_ss_info);
5227                 min_len = sizeof(struct smb3_fs_ss_info);
5228         } else if (level == FS_VOLUME_INFORMATION) {
5229                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5230                 min_len = sizeof(struct smb3_fs_vol_info);
5231         } else {
5232                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5233                 return -EINVAL;
5234         }
5235
5236         rc = build_qfs_info_req(&iov, tcon, server,
5237                                 level, max_len,
5238                                 persistent_fid, volatile_fid);
5239         if (rc)
5240                 return rc;
5241
5242         if (smb3_encryption_required(tcon))
5243                 flags |= CIFS_TRANSFORM_REQ;
5244
5245         memset(&rqst, 0, sizeof(struct smb_rqst));
5246         rqst.rq_iov = &iov;
5247         rqst.rq_nvec = 1;
5248
5249         rc = cifs_send_recv(xid, ses, server,
5250                             &rqst, &resp_buftype, flags, &rsp_iov);
5251         cifs_small_buf_release(iov.iov_base);
5252         if (rc) {
5253                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5254                 goto qfsattr_exit;
5255         }
5256         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5257
5258         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5259         offset = le16_to_cpu(rsp->OutputBufferOffset);
5260         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5261         if (rc)
5262                 goto qfsattr_exit;
5263
5264         if (level == FS_ATTRIBUTE_INFORMATION)
5265                 memcpy(&tcon->fsAttrInfo, offset
5266                         + (char *)rsp, min_t(unsigned int,
5267                         rsp_len, max_len));
5268         else if (level == FS_DEVICE_INFORMATION)
5269                 memcpy(&tcon->fsDevInfo, offset
5270                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5271         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5272                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5273                         (offset + (char *)rsp);
5274                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5275                 tcon->perf_sector_size =
5276                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5277         } else if (level == FS_VOLUME_INFORMATION) {
5278                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5279                         (offset + (char *)rsp);
5280                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5281                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5282         }
5283
5284 qfsattr_exit:
5285         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5286         return rc;
5287 }
5288
5289 int
5290 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5291            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5292            const __u32 num_lock, struct smb2_lock_element *buf)
5293 {
5294         struct smb_rqst rqst;
5295         int rc = 0;
5296         struct smb2_lock_req *req = NULL;
5297         struct kvec iov[2];
5298         struct kvec rsp_iov;
5299         int resp_buf_type;
5300         unsigned int count;
5301         int flags = CIFS_NO_RSP_BUF;
5302         unsigned int total_len;
5303         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5304
5305         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5306
5307         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5308                                  (void **) &req, &total_len);
5309         if (rc)
5310                 return rc;
5311
5312         if (smb3_encryption_required(tcon))
5313                 flags |= CIFS_TRANSFORM_REQ;
5314
5315         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5316         req->LockCount = cpu_to_le16(num_lock);
5317
5318         req->PersistentFileId = persist_fid;
5319         req->VolatileFileId = volatile_fid;
5320
5321         count = num_lock * sizeof(struct smb2_lock_element);
5322
5323         iov[0].iov_base = (char *)req;
5324         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5325         iov[1].iov_base = (char *)buf;
5326         iov[1].iov_len = count;
5327
5328         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5329
5330         memset(&rqst, 0, sizeof(struct smb_rqst));
5331         rqst.rq_iov = iov;
5332         rqst.rq_nvec = 2;
5333
5334         rc = cifs_send_recv(xid, tcon->ses, server,
5335                             &rqst, &resp_buf_type, flags,
5336                             &rsp_iov);
5337         cifs_small_buf_release(req);
5338         if (rc) {
5339                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5340                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5341                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5342                                     tcon->ses->Suid, rc);
5343         }
5344
5345         return rc;
5346 }
5347
5348 int
5349 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5350           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5351           const __u64 length, const __u64 offset, const __u32 lock_flags,
5352           const bool wait)
5353 {
5354         struct smb2_lock_element lock;
5355
5356         lock.Offset = cpu_to_le64(offset);
5357         lock.Length = cpu_to_le64(length);
5358         lock.Flags = cpu_to_le32(lock_flags);
5359         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5360                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5361
5362         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5363 }
5364
5365 int
5366 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5367                  __u8 *lease_key, const __le32 lease_state)
5368 {
5369         struct smb_rqst rqst;
5370         int rc;
5371         struct smb2_lease_ack *req = NULL;
5372         struct cifs_ses *ses = tcon->ses;
5373         int flags = CIFS_OBREAK_OP;
5374         unsigned int total_len;
5375         struct kvec iov[1];
5376         struct kvec rsp_iov;
5377         int resp_buf_type;
5378         __u64 *please_key_high;
5379         __u64 *please_key_low;
5380         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5381
5382         cifs_dbg(FYI, "SMB2_lease_break\n");
5383         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5384                                  (void **) &req, &total_len);
5385         if (rc)
5386                 return rc;
5387
5388         if (smb3_encryption_required(tcon))
5389                 flags |= CIFS_TRANSFORM_REQ;
5390
5391         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5392         req->StructureSize = cpu_to_le16(36);
5393         total_len += 12;
5394
5395         memcpy(req->LeaseKey, lease_key, 16);
5396         req->LeaseState = lease_state;
5397
5398         flags |= CIFS_NO_RSP_BUF;
5399
5400         iov[0].iov_base = (char *)req;
5401         iov[0].iov_len = total_len;
5402
5403         memset(&rqst, 0, sizeof(struct smb_rqst));
5404         rqst.rq_iov = iov;
5405         rqst.rq_nvec = 1;
5406
5407         rc = cifs_send_recv(xid, ses, server,
5408                             &rqst, &resp_buf_type, flags, &rsp_iov);
5409         cifs_small_buf_release(req);
5410
5411         please_key_low = (__u64 *)lease_key;
5412         please_key_high = (__u64 *)(lease_key+8);
5413         if (rc) {
5414                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5415                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5416                         ses->Suid, *please_key_low, *please_key_high, rc);
5417                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5418         } else
5419                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5420                         ses->Suid, *please_key_low, *please_key_high);
5421
5422         return rc;
5423 }