fs/cifs/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  */
  12
  13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14  /* Note that there are handle based routines which must be                   */
  15  /* treated slightly differently for reconnection purposes since we never     */
  16  /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/vfs.h>
  21 #include <linux/task_io_accounting_ops.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/uuid.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/xattr.h>
  26 #include "cifsglob.h"
  27 #include "cifsacl.h"
  28 #include "cifsproto.h"
  29 #include "smb2proto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "ntlmssp.h"
  33 #include "smb2status.h"
  34 #include "smb2glob.h"
  35 #include "cifspdu.h"
  36 #include "cifs_spnego.h"
  37 #include "smbdirect.h"
  38 #include "trace.h"
  39 #ifdef CONFIG_CIFS_DFS_UPCALL
  40 #include "dfs_cache.h"
  41 #endif
  42
  43 /*
  44  *  The following table defines the expected "StructureSize" of SMB2 requests
  45  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  46  *
  47  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  48  *  indexed by command in host byte order.
  49  */
  50 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  51         /* SMB2_NEGOTIATE */ 36,
  52         /* SMB2_SESSION_SETUP */ 25,
  53         /* SMB2_LOGOFF */ 4,
  54         /* SMB2_TREE_CONNECT */ 9,
  55         /* SMB2_TREE_DISCONNECT */ 4,
  56         /* SMB2_CREATE */ 57,
  57         /* SMB2_CLOSE */ 24,
  58         /* SMB2_FLUSH */ 24,
  59         /* SMB2_READ */ 49,
  60         /* SMB2_WRITE */ 49,
  61         /* SMB2_LOCK */ 48,
  62         /* SMB2_IOCTL */ 57,
  63         /* SMB2_CANCEL */ 4,
  64         /* SMB2_ECHO */ 4,
  65         /* SMB2_QUERY_DIRECTORY */ 33,
  66         /* SMB2_CHANGE_NOTIFY */ 32,
  67         /* SMB2_QUERY_INFO */ 41,
  68         /* SMB2_SET_INFO */ 33,
  69         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  70 };
  71
  72 int smb3_encryption_required(const struct cifs_tcon *tcon)
  73 {
  74         if (!tcon || !tcon->ses)
  75                 return 0;
  76         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  77             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  78                 return 1;
  79         if (tcon->seal &&
  80             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  81                 return 1;
  82         return 0;
  83 }
  84
  85 static void
  86 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  87                   const struct cifs_tcon *tcon,
  88                   struct TCP_Server_Info *server)
  89 {
  90         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  91         shdr->StructureSize = cpu_to_le16(64);
  92         shdr->Command = smb2_cmd;
  93         if (server) {
  94                 spin_lock(&server->req_lock);
  95                 /* Request up to 10 credits but don't go over the limit. */
  96                 if (server->credits >= server->max_credits)
  97                         shdr->CreditRequest = cpu_to_le16(0);
  98                 else
  99                         shdr->CreditRequest = cpu_to_le16(
 100                                 min_t(int, server->max_credits -
 101                                                 server->credits, 10));
 102                 spin_unlock(&server->req_lock);
 103         } else {
 104                 shdr->CreditRequest = cpu_to_le16(2);
 105         }
 106         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 112         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 113         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 114                 shdr->CreditCharge = cpu_to_le16(1);
 115         /* else CreditCharge MBZ */
 116
 117         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 118         /* Uid is not converted */
 119         if (tcon->ses)
 120                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 121
 122         /*
 123          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 124          * to pass the path on the Open SMB prefixed by \\server\share.
 125          * Not sure when we would need to do the augmented path (if ever) and
 126          * setting this flag breaks the SMB2 open operation since it is
 127          * illegal to send an empty path name (without \\server\share prefix)
 128          * when the DFS flag is set in the SMB open header. We could
 129          * consider setting the flag on all operations other than open
 130          * but it is safer to net set it for now.
 131          */
 132 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 133                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 134
 135         if (server && server->sign && !smb3_encryption_required(tcon))
 136                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 137 out:
 138         return;
 139 }
 140
 141 static int
 142 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 143                struct TCP_Server_Info *server)
 144 {
 145         int rc = 0;
 146         struct nls_table *nls_codepage;
 147         struct cifs_ses *ses;
 148         int retries;
 149
 150         /*
 151          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 152          * check for tcp and smb session status done differently
 153          * for those three - in the calling routine.
 154          */
 155         if (tcon == NULL)
 156                 return 0;
 157
 158         /*
 159          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 160          * cifs_tree_connect().
 161          */
 162         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 163                 return 0;
 164
 165         spin_lock(&cifs_tcp_ses_lock);
 166         if (tcon->status == TID_EXITING) {
 167                 /*
 168                  * only tree disconnect, open, and write,
 169                  * (and ulogoff which does not have tcon)
 170                  * are allowed as we start force umount.
 171                  */
 172                 if ((smb2_command != SMB2_WRITE) &&
 173                    (smb2_command != SMB2_CREATE) &&
 174                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 175                         spin_unlock(&cifs_tcp_ses_lock);
 176                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 177                                  smb2_command);
 178                         return -ENODEV;
 179                 }
 180         }
 181         spin_unlock(&cifs_tcp_ses_lock);
 182         if ((!tcon->ses) || (tcon->ses->ses_status == SES_EXITING) ||
 183             (!tcon->ses->server) || !server)
 184                 return -EIO;
 185
 186         ses = tcon->ses;
 187         retries = server->nr_targets;
 188
 189         /*
 190          * Give demultiplex thread up to 10 seconds to each target available for
 191          * reconnect -- should be greater than cifs socket timeout which is 7
 192          * seconds.
 193          */
 194         while (server->tcpStatus == CifsNeedReconnect) {
 195                 /*
 196                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 197                  * here since they are implicitly done when session drops.
 198                  */
 199                 switch (smb2_command) {
 200                 /*
 201                  * BB Should we keep oplock break and add flush to exceptions?
 202                  */
 203                 case SMB2_TREE_DISCONNECT:
 204                 case SMB2_CANCEL:
 205                 case SMB2_CLOSE:
 206                 case SMB2_OPLOCK_BREAK:
 207                         return -EAGAIN;
 208                 }
 209
 210                 rc = wait_event_interruptible_timeout(server->response_q,
 211                                                       (server->tcpStatus != CifsNeedReconnect),
 212                                                       10 * HZ);
 213                 if (rc < 0) {
 214                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 215                                  __func__);
 216                         return -ERESTARTSYS;
 217                 }
 218
 219                 /* are we still trying to reconnect? */
 220                 spin_lock(&cifs_tcp_ses_lock);
 221                 if (server->tcpStatus != CifsNeedReconnect) {
 222                         spin_unlock(&cifs_tcp_ses_lock);
 223                         break;
 224                 }
 225                 spin_unlock(&cifs_tcp_ses_lock);
 226
 227                 if (retries && --retries)
 228                         continue;
 229
 230                 /*
 231                  * on "soft" mounts we wait once. Hard mounts keep
 232                  * retrying until process is killed or server comes
 233                  * back on-line
 234                  */
 235                 if (!tcon->retry) {
 236                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 237                         return -EHOSTDOWN;
 238                 }
 239                 retries = server->nr_targets;
 240         }
 241
 242         spin_lock(&ses->chan_lock);
 243         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 244                 spin_unlock(&ses->chan_lock);
 245                 return 0;
 246         }
 247         spin_unlock(&ses->chan_lock);
 248         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 249                  tcon->ses->chans_need_reconnect,
 250                  tcon->need_reconnect);
 251
 252         nls_codepage = load_nls_default();
 253
 254         /*
 255          * Recheck after acquire mutex. If another thread is negotiating
 256          * and the server never sends an answer the socket will be closed
 257          * and tcpStatus set to reconnect.
 258          */
 259         spin_lock(&cifs_tcp_ses_lock);
 260         if (server->tcpStatus == CifsNeedReconnect) {
 261                 spin_unlock(&cifs_tcp_ses_lock);
 262                 rc = -EHOSTDOWN;
 263                 goto out;
 264         }
 265         spin_unlock(&cifs_tcp_ses_lock);
 266
 267         /*
 268          * need to prevent multiple threads trying to simultaneously
 269          * reconnect the same SMB session
 270          */
 271         spin_lock(&ses->chan_lock);
 272         if (!cifs_chan_needs_reconnect(ses, server)) {
 273                 spin_unlock(&ses->chan_lock);
 274
 275                 /* this means that we only need to tree connect */
 276                 if (tcon->need_reconnect)
 277                         goto skip_sess_setup;
 278
 279                 goto out;
 280         }
 281         spin_unlock(&ses->chan_lock);
 282
 283         mutex_lock(&ses->session_mutex);
 284         rc = cifs_negotiate_protocol(0, ses, server);
 285         if (!rc) {
 286                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 287                 if ((rc == -EACCES) && !tcon->retry) {
 288                         mutex_unlock(&ses->session_mutex);
 289                         rc = -EHOSTDOWN;
 290                         goto failed;
 291                 } else if (rc) {
 292                         mutex_unlock(&ses->session_mutex);
 293                         goto out;
 294                 }
 295         } else {
 296                 mutex_unlock(&ses->session_mutex);
 297                 goto out;
 298         }
 299         mutex_unlock(&ses->session_mutex);
 300
 301 skip_sess_setup:
 302         mutex_lock(&ses->session_mutex);
 303         if (!tcon->need_reconnect) {
 304                 mutex_unlock(&ses->session_mutex);
 305                 goto out;
 306         }
 307         cifs_mark_open_files_invalid(tcon);
 308         if (tcon->use_persistent)
 309                 tcon->need_reopen_files = true;
 310
 311         rc = cifs_tree_connect(0, tcon, nls_codepage);
 312         mutex_unlock(&ses->session_mutex);
 313
 314         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 315         if (rc) {
 316                 /* If sess reconnected but tcon didn't, something strange ... */
 317                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 318                 goto out;
 319         }
 320
 321         if (smb2_command != SMB2_INTERNAL_CMD)
 322                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 323
 324         atomic_inc(&tconInfoReconnectCount);
 325 out:
 326         /*
 327          * Check if handle based operation so we know whether we can continue
 328          * or not without returning to caller to reset file handle.
 329          */
 330         /*
 331          * BB Is flush done by server on drop of tcp session? Should we special
 332          * case it and skip above?
 333          */
 334         switch (smb2_command) {
 335         case SMB2_FLUSH:
 336         case SMB2_READ:
 337         case SMB2_WRITE:
 338         case SMB2_LOCK:
 339         case SMB2_IOCTL:
 340         case SMB2_QUERY_DIRECTORY:
 341         case SMB2_CHANGE_NOTIFY:
 342         case SMB2_QUERY_INFO:
 343         case SMB2_SET_INFO:
 344                 rc = -EAGAIN;
 345         }
 346 failed:
 347         unload_nls(nls_codepage);
 348         return rc;
 349 }
 350
 351 static void
 352 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 353                struct TCP_Server_Info *server,
 354                void *buf,
 355                unsigned int *total_len)
 356 {
 357         struct smb2_pdu *spdu = (struct smb2_pdu *)buf;
 358         /* lookup word count ie StructureSize from table */
 359         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 360
 361         /*
 362          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 363          * largest operations (Create)
 364          */
 365         memset(buf, 0, 256);
 366
 367         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 368         spdu->StructureSize2 = cpu_to_le16(parmsize);
 369
 370         *total_len = parmsize + sizeof(struct smb2_hdr);
 371 }
 372
 373 /*
 374  * Allocate and return pointer to an SMB request hdr, and set basic
 375  * SMB information in the SMB header. If the return code is zero, this
 376  * function must have filled in request_buf pointer.
 377  */
 378 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 379                                  struct TCP_Server_Info *server,
 380                                  void **request_buf, unsigned int *total_len)
 381 {
 382         /* BB eventually switch this to SMB2 specific small buf size */
 383         if (smb2_command == SMB2_SET_INFO)
 384                 *request_buf = cifs_buf_get();
 385         else
 386                 *request_buf = cifs_small_buf_get();
 387         if (*request_buf == NULL) {
 388                 /* BB should we add a retry in here if not a writepage? */
 389                 return -ENOMEM;
 390         }
 391
 392         fill_small_buf(smb2_command, tcon, server,
 393                        (struct smb2_hdr *)(*request_buf),
 394                        total_len);
 395
 396         if (tcon != NULL) {
 397                 uint16_t com_code = le16_to_cpu(smb2_command);
 398                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 399                 cifs_stats_inc(&tcon->num_smbs_sent);
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 406                                struct TCP_Server_Info *server,
 407                                void **request_buf, unsigned int *total_len)
 408 {
 409         int rc;
 410
 411         rc = smb2_reconnect(smb2_command, tcon, server);
 412         if (rc)
 413                 return rc;
 414
 415         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 416                                      total_len);
 417 }
 418
 419 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 420                                struct TCP_Server_Info *server,
 421                                void **request_buf, unsigned int *total_len)
 422 {
 423         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 424         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 425                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 426                                              request_buf, total_len);
 427         }
 428         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 429                                    request_buf, total_len);
 430 }
 431
 432 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 433
 434 static void
 435 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 436 {
 437         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 438         pneg_ctxt->DataLength = cpu_to_le16(38);
 439         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 440         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 441         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 442         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 443 }
 444
 445 static void
 446 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 447 {
 448         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 449         pneg_ctxt->DataLength =
 450                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 451                           - sizeof(struct smb2_neg_context));
 452         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 453         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 454         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 455         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 456 }
 457
 458 static unsigned int
 459 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 460 {
 461         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 462         unsigned short num_algs = 1; /* number of signing algorithms sent */
 463
 464         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 465         /*
 466          * Context Data length must be rounded to multiple of 8 for some servers
 467          */
 468         pneg_ctxt->DataLength = cpu_to_le16(DIV_ROUND_UP(
 469                                 sizeof(struct smb2_signing_capabilities) -
 470                                 sizeof(struct smb2_neg_context) +
 471                                 (num_algs * 2 /* sizeof u16 */), 8) * 8);
 472         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 473         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 474
 475         ctxt_len += 2 /* sizeof le16 */ * num_algs;
 476         ctxt_len = DIV_ROUND_UP(ctxt_len, 8) * 8;
 477         return ctxt_len;
 478         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 479 }
 480
 481 static void
 482 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 483 {
 484         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 485         if (require_gcm_256) {
 486                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 487                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 488                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 489         } else if (enable_gcm_256) {
 490                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 491                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 492                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 493                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 494                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 495         } else {
 496                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 497                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 498                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 499                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 500         }
 501 }
 502
 503 static unsigned int
 504 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 505 {
 506         struct nls_table *cp = load_nls_default();
 507
 508         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 509
 510         /* copy up to max of first 100 bytes of server name to NetName field */
 511         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 512         /* context size is DataLength + minimal smb2_neg_context */
 513         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 514                         sizeof(struct smb2_neg_context), 8) * 8;
 515 }
 516
 517 static void
 518 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 519 {
 520         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 521         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 522         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 523         pneg_ctxt->Name[0] = 0x93;
 524         pneg_ctxt->Name[1] = 0xAD;
 525         pneg_ctxt->Name[2] = 0x25;
 526         pneg_ctxt->Name[3] = 0x50;
 527         pneg_ctxt->Name[4] = 0x9C;
 528         pneg_ctxt->Name[5] = 0xB4;
 529         pneg_ctxt->Name[6] = 0x11;
 530         pneg_ctxt->Name[7] = 0xE7;
 531         pneg_ctxt->Name[8] = 0xB4;
 532         pneg_ctxt->Name[9] = 0x23;
 533         pneg_ctxt->Name[10] = 0x83;
 534         pneg_ctxt->Name[11] = 0xDE;
 535         pneg_ctxt->Name[12] = 0x96;
 536         pneg_ctxt->Name[13] = 0x8B;
 537         pneg_ctxt->Name[14] = 0xCD;
 538         pneg_ctxt->Name[15] = 0x7C;
 539 }
 540
 541 static void
 542 assemble_neg_contexts(struct smb2_negotiate_req *req,
 543                       struct TCP_Server_Info *server, unsigned int *total_len)
 544 {
 545         char *pneg_ctxt;
 546         char *hostname = NULL;
 547         unsigned int ctxt_len, neg_context_count;
 548
 549         if (*total_len > 200) {
 550                 /* In case length corrupted don't want to overrun smb buffer */
 551                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 552                 return;
 553         }
 554
 555         /*
 556          * round up total_len of fixed part of SMB3 negotiate request to 8
 557          * byte boundary before adding negotiate contexts
 558          */
 559         *total_len = roundup(*total_len, 8);
 560
 561         pneg_ctxt = (*total_len) + (char *)req;
 562         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 563
 564         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 565         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 566         *total_len += ctxt_len;
 567         pneg_ctxt += ctxt_len;
 568
 569         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 570         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 571         *total_len += ctxt_len;
 572         pneg_ctxt += ctxt_len;
 573
 574         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 575         *total_len += sizeof(struct smb2_posix_neg_context);
 576         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 577
 578         /*
 579          * secondary channels don't have the hostname field populated
 580          * use the hostname field in the primary channel instead
 581          */
 582         hostname = CIFS_SERVER_IS_CHAN(server) ?
 583                 server->primary_server->hostname : server->hostname;
 584         if (hostname && (hostname[0] != 0)) {
 585                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 586                                               hostname);
 587                 *total_len += ctxt_len;
 588                 pneg_ctxt += ctxt_len;
 589                 neg_context_count = 4;
 590         } else /* second channels do not have a hostname */
 591                 neg_context_count = 3;
 592
 593         if (server->compress_algorithm) {
 594                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 595                                 pneg_ctxt);
 596                 ctxt_len = DIV_ROUND_UP(
 597                         sizeof(struct smb2_compression_capabilities_context),
 598                                 8) * 8;
 599                 *total_len += ctxt_len;
 600                 pneg_ctxt += ctxt_len;
 601                 neg_context_count++;
 602         }
 603
 604         if (enable_negotiate_signing) {
 605                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 606                                 pneg_ctxt);
 607                 *total_len += ctxt_len;
 608                 pneg_ctxt += ctxt_len;
 609                 neg_context_count++;
 610         }
 611
 612         /* check for and add transport_capabilities and signing capabilities */
 613         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 614
 615 }
 616
 617 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 618 {
 619         unsigned int len = le16_to_cpu(ctxt->DataLength);
 620
 621         /* If invalid preauth context warn but use what we requested, SHA-512 */
 622         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 623                 pr_warn_once("server sent bad preauth context\n");
 624                 return;
 625         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 626                 pr_warn_once("server sent invalid SaltLength\n");
 627                 return;
 628         }
 629         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 630                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 631         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 632                 pr_warn_once("unknown SMB3 hash algorithm\n");
 633 }
 634
 635 static void decode_compress_ctx(struct TCP_Server_Info *server,
 636                          struct smb2_compression_capabilities_context *ctxt)
 637 {
 638         unsigned int len = le16_to_cpu(ctxt->DataLength);
 639
 640         /* sizeof compress context is a one element compression capbility struct */
 641         if (len < 10) {
 642                 pr_warn_once("server sent bad compression cntxt\n");
 643                 return;
 644         }
 645         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 646                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 647                 return;
 648         }
 649         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 650                 pr_warn_once("unknown compression algorithm\n");
 651                 return;
 652         }
 653         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 654 }
 655
 656 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 657                               struct smb2_encryption_neg_context *ctxt)
 658 {
 659         unsigned int len = le16_to_cpu(ctxt->DataLength);
 660
 661         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 662         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 663                 pr_warn_once("server sent bad crypto ctxt len\n");
 664                 return -EINVAL;
 665         }
 666
 667         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 668                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 669                 return -EINVAL;
 670         }
 671         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 672         if (require_gcm_256) {
 673                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 674                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 675                         return -EOPNOTSUPP;
 676                 }
 677         } else if (ctxt->Ciphers[0] == 0) {
 678                 /*
 679                  * e.g. if server only supported AES256_CCM (very unlikely)
 680                  * or server supported no encryption types or had all disabled.
 681                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 682                  * in which mount requested encryption ("seal") checks later
 683                  * on during tree connection will return proper rc, but if
 684                  * seal not requested by client, since server is allowed to
 685                  * return 0 to indicate no supported cipher, we can't fail here
 686                  */
 687                 server->cipher_type = 0;
 688                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 689                 pr_warn_once("Server does not support requested encryption types\n");
 690                 return 0;
 691         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 692                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 693                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 694                 /* server returned a cipher we didn't ask for */
 695                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 696                 return -EINVAL;
 697         }
 698         server->cipher_type = ctxt->Ciphers[0];
 699         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 700         return 0;
 701 }
 702
 703 static void decode_signing_ctx(struct TCP_Server_Info *server,
 704                                struct smb2_signing_capabilities *pctxt)
 705 {
 706         unsigned int len = le16_to_cpu(pctxt->DataLength);
 707
 708         if ((len < 4) || (len > 16)) {
 709                 pr_warn_once("server sent bad signing negcontext\n");
 710                 return;
 711         }
 712         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 713                 pr_warn_once("Invalid signing algorithm count\n");
 714                 return;
 715         }
 716         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 717                 pr_warn_once("unknown signing algorithm\n");
 718                 return;
 719         }
 720
 721         server->signing_negotiated = true;
 722         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 723         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 724                      server->signing_algorithm);
 725 }
 726
 727
 728 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 729                                      struct TCP_Server_Info *server,
 730                                      unsigned int len_of_smb)
 731 {
 732         struct smb2_neg_context *pctx;
 733         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 734         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 735         unsigned int len_of_ctxts, i;
 736         int rc = 0;
 737
 738         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 739         if (len_of_smb <= offset) {
 740                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 741                 return -EINVAL;
 742         }
 743
 744         len_of_ctxts = len_of_smb - offset;
 745
 746         for (i = 0; i < ctxt_cnt; i++) {
 747                 int clen;
 748                 /* check that offset is not beyond end of SMB */
 749                 if (len_of_ctxts == 0)
 750                         break;
 751
 752                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 753                         break;
 754
 755                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 756                 clen = le16_to_cpu(pctx->DataLength);
 757                 if (clen > len_of_ctxts)
 758                         break;
 759
 760                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 761                         decode_preauth_context(
 762                                 (struct smb2_preauth_neg_context *)pctx);
 763                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 764                         rc = decode_encrypt_ctx(server,
 765                                 (struct smb2_encryption_neg_context *)pctx);
 766                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 767                         decode_compress_ctx(server,
 768                                 (struct smb2_compression_capabilities_context *)pctx);
 769                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 770                         server->posix_ext_supported = true;
 771                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 772                         decode_signing_ctx(server,
 773                                 (struct smb2_signing_capabilities *)pctx);
 774                 else
 775                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 776                                 le16_to_cpu(pctx->ContextType));
 777
 778                 if (rc)
 779                         break;
 780                 /* offsets must be 8 byte aligned */
 781                 clen = (clen + 7) & ~0x7;
 782                 offset += clen + sizeof(struct smb2_neg_context);
 783                 len_of_ctxts -= clen;
 784         }
 785         return rc;
 786 }
 787
 788 static struct create_posix *
 789 create_posix_buf(umode_t mode)
 790 {
 791         struct create_posix *buf;
 792
 793         buf = kzalloc(sizeof(struct create_posix),
 794                         GFP_KERNEL);
 795         if (!buf)
 796                 return NULL;
 797
 798         buf->ccontext.DataOffset =
 799                 cpu_to_le16(offsetof(struct create_posix, Mode));
 800         buf->ccontext.DataLength = cpu_to_le32(4);
 801         buf->ccontext.NameOffset =
 802                 cpu_to_le16(offsetof(struct create_posix, Name));
 803         buf->ccontext.NameLength = cpu_to_le16(16);
 804
 805         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 806         buf->Name[0] = 0x93;
 807         buf->Name[1] = 0xAD;
 808         buf->Name[2] = 0x25;
 809         buf->Name[3] = 0x50;
 810         buf->Name[4] = 0x9C;
 811         buf->Name[5] = 0xB4;
 812         buf->Name[6] = 0x11;
 813         buf->Name[7] = 0xE7;
 814         buf->Name[8] = 0xB4;
 815         buf->Name[9] = 0x23;
 816         buf->Name[10] = 0x83;
 817         buf->Name[11] = 0xDE;
 818         buf->Name[12] = 0x96;
 819         buf->Name[13] = 0x8B;
 820         buf->Name[14] = 0xCD;
 821         buf->Name[15] = 0x7C;
 822         buf->Mode = cpu_to_le32(mode);
 823         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 824         return buf;
 825 }
 826
 827 static int
 828 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 829 {
 830         struct smb2_create_req *req = iov[0].iov_base;
 831         unsigned int num = *num_iovec;
 832
 833         iov[num].iov_base = create_posix_buf(mode);
 834         if (mode == ACL_NO_MODE)
 835                 cifs_dbg(FYI, "Invalid mode\n");
 836         if (iov[num].iov_base == NULL)
 837                 return -ENOMEM;
 838         iov[num].iov_len = sizeof(struct create_posix);
 839         if (!req->CreateContextsOffset)
 840                 req->CreateContextsOffset = cpu_to_le32(
 841                                 sizeof(struct smb2_create_req) +
 842                                 iov[num - 1].iov_len);
 843         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 844         *num_iovec = num + 1;
 845         return 0;
 846 }
 847
 848
 849 /*
 850  *
 851  *      SMB2 Worker functions follow:
 852  *
 853  *      The general structure of the worker functions is:
 854  *      1) Call smb2_init (assembles SMB2 header)
 855  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 856  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 857  *      4) Decode SMB2 command specific fields in the fixed length area
 858  *      5) Decode variable length data area (if any for this SMB2 command type)
 859  *      6) Call free smb buffer
 860  *      7) return
 861  *
 862  */
 863
 864 int
 865 SMB2_negotiate(const unsigned int xid,
 866                struct cifs_ses *ses,
 867                struct TCP_Server_Info *server)
 868 {
 869         struct smb_rqst rqst;
 870         struct smb2_negotiate_req *req;
 871         struct smb2_negotiate_rsp *rsp;
 872         struct kvec iov[1];
 873         struct kvec rsp_iov;
 874         int rc = 0;
 875         int resp_buftype;
 876         int blob_offset, blob_length;
 877         char *security_blob;
 878         int flags = CIFS_NEG_OP;
 879         unsigned int total_len;
 880
 881         cifs_dbg(FYI, "Negotiate protocol\n");
 882
 883         if (!server) {
 884                 WARN(1, "%s: server is NULL!\n", __func__);
 885                 return -EIO;
 886         }
 887
 888         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 889                                  (void **) &req, &total_len);
 890         if (rc)
 891                 return rc;
 892
 893         req->hdr.SessionId = 0;
 894
 895         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 896         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 897
 898         if (strcmp(server->vals->version_string,
 899                    SMB3ANY_VERSION_STRING) == 0) {
 900                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 901                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 902                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 903                 req->DialectCount = cpu_to_le16(3);
 904                 total_len += 6;
 905         } else if (strcmp(server->vals->version_string,
 906                    SMBDEFAULT_VERSION_STRING) == 0) {
 907                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 908                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 909                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 910                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 911                 req->DialectCount = cpu_to_le16(4);
 912                 total_len += 8;
 913         } else {
 914                 /* otherwise send specific dialect */
 915                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 916                 req->DialectCount = cpu_to_le16(1);
 917                 total_len += 2;
 918         }
 919
 920         /* only one of SMB2 signing flags may be set in SMB2 request */
 921         if (ses->sign)
 922                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 923         else if (global_secflags & CIFSSEC_MAY_SIGN)
 924                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 925         else
 926                 req->SecurityMode = 0;
 927
 928         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 929         if (ses->chan_max > 1)
 930                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 931
 932         /* ClientGUID must be zero for SMB2.02 dialect */
 933         if (server->vals->protocol_id == SMB20_PROT_ID)
 934                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 935         else {
 936                 memcpy(req->ClientGUID, server->client_guid,
 937                         SMB2_CLIENT_GUID_SIZE);
 938                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 939                     (strcmp(server->vals->version_string,
 940                      SMB3ANY_VERSION_STRING) == 0) ||
 941                     (strcmp(server->vals->version_string,
 942                      SMBDEFAULT_VERSION_STRING) == 0))
 943                         assemble_neg_contexts(req, server, &total_len);
 944         }
 945         iov[0].iov_base = (char *)req;
 946         iov[0].iov_len = total_len;
 947
 948         memset(&rqst, 0, sizeof(struct smb_rqst));
 949         rqst.rq_iov = iov;
 950         rqst.rq_nvec = 1;
 951
 952         rc = cifs_send_recv(xid, ses, server,
 953                             &rqst, &resp_buftype, flags, &rsp_iov);
 954         cifs_small_buf_release(req);
 955         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 956         /*
 957          * No tcon so can't do
 958          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 959          */
 960         if (rc == -EOPNOTSUPP) {
 961                 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");
 962                 goto neg_exit;
 963         } else if (rc != 0)
 964                 goto neg_exit;
 965
 966         if (strcmp(server->vals->version_string,
 967                    SMB3ANY_VERSION_STRING) == 0) {
 968                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 969                         cifs_server_dbg(VFS,
 970                                 "SMB2 dialect returned but not requested\n");
 971                         return -EIO;
 972                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 973                         cifs_server_dbg(VFS,
 974                                 "SMB2.1 dialect returned but not requested\n");
 975                         return -EIO;
 976                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 977                         /* ops set to 3.0 by default for default so update */
 978                         server->ops = &smb311_operations;
 979                         server->vals = &smb311_values;
 980                 }
 981         } else if (strcmp(server->vals->version_string,
 982                    SMBDEFAULT_VERSION_STRING) == 0) {
 983                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 984                         cifs_server_dbg(VFS,
 985                                 "SMB2 dialect returned but not requested\n");
 986                         return -EIO;
 987                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 988                         /* ops set to 3.0 by default for default so update */
 989                         server->ops = &smb21_operations;
 990                         server->vals = &smb21_values;
 991                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 992                         server->ops = &smb311_operations;
 993                         server->vals = &smb311_values;
 994                 }
 995         } else if (le16_to_cpu(rsp->DialectRevision) !=
 996                                 server->vals->protocol_id) {
 997                 /* if requested single dialect ensure returned dialect matched */
 998                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 999                                 le16_to_cpu(rsp->DialectRevision));
1000                 return -EIO;
1001         }
1002
1003         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1004
1005         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1006                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1007         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1008                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1009         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1010                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1011         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1012                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1013         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1014                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1015         else {
1016                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1017                                 le16_to_cpu(rsp->DialectRevision));
1018                 rc = -EIO;
1019                 goto neg_exit;
1020         }
1021         server->dialect = le16_to_cpu(rsp->DialectRevision);
1022
1023         /*
1024          * Keep a copy of the hash after negprot. This hash will be
1025          * the starting hash value for all sessions made from this
1026          * server.
1027          */
1028         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1029                SMB2_PREAUTH_HASH_SIZE);
1030
1031         /* SMB2 only has an extended negflavor */
1032         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1033         /* set it to the maximum buffer size value we can send with 1 credit */
1034         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1035                                SMB2_MAX_BUFFER_SIZE);
1036         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1037         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1038         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1039         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1040                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1041                                 server->sec_mode);
1042         server->capabilities = le32_to_cpu(rsp->Capabilities);
1043         /* Internal types */
1044         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1045
1046         /*
1047          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1048          * Set the cipher type manually.
1049          */
1050         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1051                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1052
1053         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1054                                                (struct smb2_hdr *)rsp);
1055         /*
1056          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1057          * for us will be
1058          *      ses->sectype = RawNTLMSSP;
1059          * but for time being this is our only auth choice so doesn't matter.
1060          * We just found a server which sets blob length to zero expecting raw.
1061          */
1062         if (blob_length == 0) {
1063                 cifs_dbg(FYI, "missing security blob on negprot\n");
1064                 server->sec_ntlmssp = true;
1065         }
1066
1067         rc = cifs_enable_signing(server, ses->sign);
1068         if (rc)
1069                 goto neg_exit;
1070         if (blob_length) {
1071                 rc = decode_negTokenInit(security_blob, blob_length, server);
1072                 if (rc == 1)
1073                         rc = 0;
1074                 else if (rc == 0)
1075                         rc = -EIO;
1076         }
1077
1078         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1079                 if (rsp->NegotiateContextCount)
1080                         rc = smb311_decode_neg_context(rsp, server,
1081                                                        rsp_iov.iov_len);
1082                 else
1083                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1084         }
1085 neg_exit:
1086         free_rsp_buf(resp_buftype, rsp);
1087         return rc;
1088 }
1089
1090 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1091 {
1092         int rc;
1093         struct validate_negotiate_info_req *pneg_inbuf;
1094         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1095         u32 rsplen;
1096         u32 inbuflen; /* max of 4 dialects */
1097         struct TCP_Server_Info *server = tcon->ses->server;
1098
1099         cifs_dbg(FYI, "validate negotiate\n");
1100
1101         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1102         if (server->dialect == SMB311_PROT_ID)
1103                 return 0;
1104
1105         /*
1106          * validation ioctl must be signed, so no point sending this if we
1107          * can not sign it (ie are not known user).  Even if signing is not
1108          * required (enabled but not negotiated), in those cases we selectively
1109          * sign just this, the first and only signed request on a connection.
1110          * Having validation of negotiate info  helps reduce attack vectors.
1111          */
1112         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1113                 return 0; /* validation requires signing */
1114
1115         if (tcon->ses->user_name == NULL) {
1116                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1117                 return 0; /* validation requires signing */
1118         }
1119
1120         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1121                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1122
1123         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1124         if (!pneg_inbuf)
1125                 return -ENOMEM;
1126
1127         pneg_inbuf->Capabilities =
1128                         cpu_to_le32(server->vals->req_capabilities);
1129         if (tcon->ses->chan_max > 1)
1130                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1131
1132         memcpy(pneg_inbuf->Guid, server->client_guid,
1133                                         SMB2_CLIENT_GUID_SIZE);
1134
1135         if (tcon->ses->sign)
1136                 pneg_inbuf->SecurityMode =
1137                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1138         else if (global_secflags & CIFSSEC_MAY_SIGN)
1139                 pneg_inbuf->SecurityMode =
1140                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1141         else
1142                 pneg_inbuf->SecurityMode = 0;
1143
1144
1145         if (strcmp(server->vals->version_string,
1146                 SMB3ANY_VERSION_STRING) == 0) {
1147                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1148                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1149                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1150                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1151                 /* SMB 2.1 not included so subtract one dialect from len */
1152                 inbuflen = sizeof(*pneg_inbuf) -
1153                                 (sizeof(pneg_inbuf->Dialects[0]));
1154         } else if (strcmp(server->vals->version_string,
1155                 SMBDEFAULT_VERSION_STRING) == 0) {
1156                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1157                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1158                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1159                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1160                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1161                 /* structure is big enough for 4 dialects */
1162                 inbuflen = sizeof(*pneg_inbuf);
1163         } else {
1164                 /* otherwise specific dialect was requested */
1165                 pneg_inbuf->Dialects[0] =
1166                         cpu_to_le16(server->vals->protocol_id);
1167                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1168                 /* structure is big enough for 3 dialects, sending only 1 */
1169                 inbuflen = sizeof(*pneg_inbuf) -
1170                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1171         }
1172
1173         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1174                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1175                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1176                 (char **)&pneg_rsp, &rsplen);
1177         if (rc == -EOPNOTSUPP) {
1178                 /*
1179                  * Old Windows versions or Netapp SMB server can return
1180                  * not supported error. Client should accept it.
1181                  */
1182                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1183                 rc = 0;
1184                 goto out_free_inbuf;
1185         } else if (rc != 0) {
1186                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1187                               rc);
1188                 rc = -EIO;
1189                 goto out_free_inbuf;
1190         }
1191
1192         rc = -EIO;
1193         if (rsplen != sizeof(*pneg_rsp)) {
1194                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1195                               rsplen);
1196
1197                 /* relax check since Mac returns max bufsize allowed on ioctl */
1198                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1199                         goto out_free_rsp;
1200         }
1201
1202         /* check validate negotiate info response matches what we got earlier */
1203         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1204                 goto vneg_out;
1205
1206         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1207                 goto vneg_out;
1208
1209         /* do not validate server guid because not saved at negprot time yet */
1210
1211         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1212               SMB2_LARGE_FILES) != server->capabilities)
1213                 goto vneg_out;
1214
1215         /* validate negotiate successful */
1216         rc = 0;
1217         cifs_dbg(FYI, "validate negotiate info successful\n");
1218         goto out_free_rsp;
1219
1220 vneg_out:
1221         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1222 out_free_rsp:
1223         kfree(pneg_rsp);
1224 out_free_inbuf:
1225         kfree(pneg_inbuf);
1226         return rc;
1227 }
1228
1229 enum securityEnum
1230 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1231 {
1232         switch (requested) {
1233         case Kerberos:
1234         case RawNTLMSSP:
1235                 return requested;
1236         case NTLMv2:
1237                 return RawNTLMSSP;
1238         case Unspecified:
1239                 if (server->sec_ntlmssp &&
1240                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1241                         return RawNTLMSSP;
1242                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1243                         (global_secflags & CIFSSEC_MAY_KRB5))
1244                         return Kerberos;
1245                 fallthrough;
1246         default:
1247                 return Unspecified;
1248         }
1249 }
1250
1251 struct SMB2_sess_data {
1252         unsigned int xid;
1253         struct cifs_ses *ses;
1254         struct TCP_Server_Info *server;
1255         struct nls_table *nls_cp;
1256         void (*func)(struct SMB2_sess_data *);
1257         int result;
1258         u64 previous_session;
1259
1260         /* we will send the SMB in three pieces:
1261          * a fixed length beginning part, an optional
1262          * SPNEGO blob (which can be zero length), and a
1263          * last part which will include the strings
1264          * and rest of bcc area. This allows us to avoid
1265          * a large buffer 17K allocation
1266          */
1267         int buf0_type;
1268         struct kvec iov[2];
1269 };
1270
1271 static int
1272 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1273 {
1274         int rc;
1275         struct cifs_ses *ses = sess_data->ses;
1276         struct TCP_Server_Info *server = sess_data->server;
1277         struct smb2_sess_setup_req *req;
1278         unsigned int total_len;
1279         bool is_binding = false;
1280
1281         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1282                                  (void **) &req,
1283                                  &total_len);
1284         if (rc)
1285                 return rc;
1286
1287         spin_lock(&ses->chan_lock);
1288         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1289         spin_unlock(&ses->chan_lock);
1290
1291         if (is_binding) {
1292                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1293                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1294                 req->PreviousSessionId = 0;
1295                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1296                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1297         } else {
1298                 /* First session, not a reauthenticate */
1299                 req->hdr.SessionId = 0;
1300                 /*
1301                  * if reconnect, we need to send previous sess id
1302                  * otherwise it is 0
1303                  */
1304                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1305                 req->Flags = 0; /* MBZ */
1306                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1307                          sess_data->previous_session);
1308         }
1309
1310         /* enough to enable echos and oplocks and one max size write */
1311         req->hdr.CreditRequest = cpu_to_le16(130);
1312
1313         /* only one of SMB2 signing flags may be set in SMB2 request */
1314         if (server->sign)
1315                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1316         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1317                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1318         else
1319                 req->SecurityMode = 0;
1320
1321 #ifdef CONFIG_CIFS_DFS_UPCALL
1322         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1323 #else
1324         req->Capabilities = 0;
1325 #endif /* DFS_UPCALL */
1326
1327         req->Channel = 0; /* MBZ */
1328
1329         sess_data->iov[0].iov_base = (char *)req;
1330         /* 1 for pad */
1331         sess_data->iov[0].iov_len = total_len - 1;
1332         /*
1333          * This variable will be used to clear the buffer
1334          * allocated above in case of any error in the calling function.
1335          */
1336         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1337
1338         return 0;
1339 }
1340
1341 static void
1342 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1343 {
1344         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1345         sess_data->buf0_type = CIFS_NO_BUFFER;
1346 }
1347
1348 static int
1349 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1350 {
1351         int rc;
1352         struct smb_rqst rqst;
1353         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1354         struct kvec rsp_iov = { NULL, 0 };
1355
1356         /* Testing shows that buffer offset must be at location of Buffer[0] */
1357         req->SecurityBufferOffset =
1358                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1359         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1360
1361         memset(&rqst, 0, sizeof(struct smb_rqst));
1362         rqst.rq_iov = sess_data->iov;
1363         rqst.rq_nvec = 2;
1364
1365         /* BB add code to build os and lm fields */
1366         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1367                             sess_data->server,
1368                             &rqst,
1369                             &sess_data->buf0_type,
1370                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1371         cifs_small_buf_release(sess_data->iov[0].iov_base);
1372         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1373
1374         return rc;
1375 }
1376
1377 static int
1378 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1379 {
1380         int rc = 0;
1381         struct cifs_ses *ses = sess_data->ses;
1382         struct TCP_Server_Info *server = sess_data->server;
1383
1384         cifs_server_lock(server);
1385         if (server->ops->generate_signingkey) {
1386                 rc = server->ops->generate_signingkey(ses, server);
1387                 if (rc) {
1388                         cifs_dbg(FYI,
1389                                 "SMB3 session key generation failed\n");
1390                         cifs_server_unlock(server);
1391                         return rc;
1392                 }
1393         }
1394         if (!server->session_estab) {
1395                 server->sequence_number = 0x2;
1396                 server->session_estab = true;
1397         }
1398         cifs_server_unlock(server);
1399
1400         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1401         return rc;
1402 }
1403
1404 #ifdef CONFIG_CIFS_UPCALL
1405 static void
1406 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1407 {
1408         int rc;
1409         struct cifs_ses *ses = sess_data->ses;
1410         struct TCP_Server_Info *server = sess_data->server;
1411         struct cifs_spnego_msg *msg;
1412         struct key *spnego_key = NULL;
1413         struct smb2_sess_setup_rsp *rsp = NULL;
1414         bool is_binding = false;
1415
1416         rc = SMB2_sess_alloc_buffer(sess_data);
1417         if (rc)
1418                 goto out;
1419
1420         spnego_key = cifs_get_spnego_key(ses, server);
1421         if (IS_ERR(spnego_key)) {
1422                 rc = PTR_ERR(spnego_key);
1423                 if (rc == -ENOKEY)
1424                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1425                 spnego_key = NULL;
1426                 goto out;
1427         }
1428
1429         msg = spnego_key->payload.data[0];
1430         /*
1431          * check version field to make sure that cifs.upcall is
1432          * sending us a response in an expected form
1433          */
1434         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1435                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1436                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1437                 rc = -EKEYREJECTED;
1438                 goto out_put_spnego_key;
1439         }
1440
1441         spin_lock(&ses->chan_lock);
1442         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1443         spin_unlock(&ses->chan_lock);
1444
1445         /* keep session key if binding */
1446         if (!is_binding) {
1447                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1448                                                  GFP_KERNEL);
1449                 if (!ses->auth_key.response) {
1450                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1451                                  msg->sesskey_len);
1452                         rc = -ENOMEM;
1453                         goto out_put_spnego_key;
1454                 }
1455                 ses->auth_key.len = msg->sesskey_len;
1456         }
1457
1458         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1459         sess_data->iov[1].iov_len = msg->secblob_len;
1460
1461         rc = SMB2_sess_sendreceive(sess_data);
1462         if (rc)
1463                 goto out_put_spnego_key;
1464
1465         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1466         /* keep session id and flags if binding */
1467         if (!is_binding) {
1468                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1469                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1470         }
1471
1472         rc = SMB2_sess_establish_session(sess_data);
1473 out_put_spnego_key:
1474         key_invalidate(spnego_key);
1475         key_put(spnego_key);
1476 out:
1477         sess_data->result = rc;
1478         sess_data->func = NULL;
1479         SMB2_sess_free_buffer(sess_data);
1480 }
1481 #else
1482 static void
1483 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1484 {
1485         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1486         sess_data->result = -EOPNOTSUPP;
1487         sess_data->func = NULL;
1488 }
1489 #endif
1490
1491 static void
1492 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1493
1494 static void
1495 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1496 {
1497         int rc;
1498         struct cifs_ses *ses = sess_data->ses;
1499         struct TCP_Server_Info *server = sess_data->server;
1500         struct smb2_sess_setup_rsp *rsp = NULL;
1501         unsigned char *ntlmssp_blob = NULL;
1502         bool use_spnego = false; /* else use raw ntlmssp */
1503         u16 blob_length = 0;
1504         bool is_binding = false;
1505
1506         /*
1507          * If memory allocation is successful, caller of this function
1508          * frees it.
1509          */
1510         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1511         if (!ses->ntlmssp) {
1512                 rc = -ENOMEM;
1513                 goto out_err;
1514         }
1515         ses->ntlmssp->sesskey_per_smbsess = true;
1516
1517         rc = SMB2_sess_alloc_buffer(sess_data);
1518         if (rc)
1519                 goto out_err;
1520
1521         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1522                                           &blob_length, ses, server,
1523                                           sess_data->nls_cp);
1524         if (rc)
1525                 goto out_err;
1526
1527         if (use_spnego) {
1528                 /* BB eventually need to add this */
1529                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1530                 rc = -EOPNOTSUPP;
1531                 goto out;
1532         }
1533         sess_data->iov[1].iov_base = ntlmssp_blob;
1534         sess_data->iov[1].iov_len = blob_length;
1535
1536         rc = SMB2_sess_sendreceive(sess_data);
1537         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1538
1539         /* If true, rc here is expected and not an error */
1540         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1541                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1542                 rc = 0;
1543
1544         if (rc)
1545                 goto out;
1546
1547         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1548                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1549                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1550                         le16_to_cpu(rsp->SecurityBufferOffset));
1551                 rc = -EIO;
1552                 goto out;
1553         }
1554         rc = decode_ntlmssp_challenge(rsp->Buffer,
1555                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1556         if (rc)
1557                 goto out;
1558
1559         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1560
1561         spin_lock(&ses->chan_lock);
1562         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1563         spin_unlock(&ses->chan_lock);
1564
1565         /* keep existing ses id and flags if binding */
1566         if (!is_binding) {
1567                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1568                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1569         }
1570
1571 out:
1572         kfree(ntlmssp_blob);
1573         SMB2_sess_free_buffer(sess_data);
1574         if (!rc) {
1575                 sess_data->result = 0;
1576                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1577                 return;
1578         }
1579 out_err:
1580         kfree(ses->ntlmssp);
1581         ses->ntlmssp = NULL;
1582         sess_data->result = rc;
1583         sess_data->func = NULL;
1584 }
1585
1586 static void
1587 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1588 {
1589         int rc;
1590         struct cifs_ses *ses = sess_data->ses;
1591         struct TCP_Server_Info *server = sess_data->server;
1592         struct smb2_sess_setup_req *req;
1593         struct smb2_sess_setup_rsp *rsp = NULL;
1594         unsigned char *ntlmssp_blob = NULL;
1595         bool use_spnego = false; /* else use raw ntlmssp */
1596         u16 blob_length = 0;
1597         bool is_binding = false;
1598
1599         rc = SMB2_sess_alloc_buffer(sess_data);
1600         if (rc)
1601                 goto out;
1602
1603         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1604         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1605
1606         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1607                                      ses, server,
1608                                      sess_data->nls_cp);
1609         if (rc) {
1610                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1611                 goto out;
1612         }
1613
1614         if (use_spnego) {
1615                 /* BB eventually need to add this */
1616                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1617                 rc = -EOPNOTSUPP;
1618                 goto out;
1619         }
1620         sess_data->iov[1].iov_base = ntlmssp_blob;
1621         sess_data->iov[1].iov_len = blob_length;
1622
1623         rc = SMB2_sess_sendreceive(sess_data);
1624         if (rc)
1625                 goto out;
1626
1627         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1628
1629         spin_lock(&ses->chan_lock);
1630         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1631         spin_unlock(&ses->chan_lock);
1632
1633         /* keep existing ses id and flags if binding */
1634         if (!is_binding) {
1635                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1636                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1637         }
1638
1639         rc = SMB2_sess_establish_session(sess_data);
1640 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1641         if (ses->server->dialect < SMB30_PROT_ID) {
1642                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1643                 /*
1644                  * The session id is opaque in terms of endianness, so we can't
1645                  * print it as a long long. we dump it as we got it on the wire
1646                  */
1647                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1648                          &ses->Suid);
1649                 cifs_dbg(VFS, "Session Key   %*ph\n",
1650                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1651                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1652                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1653         }
1654 #endif
1655 out:
1656         kfree(ntlmssp_blob);
1657         SMB2_sess_free_buffer(sess_data);
1658         kfree(ses->ntlmssp);
1659         ses->ntlmssp = NULL;
1660         sess_data->result = rc;
1661         sess_data->func = NULL;
1662 }
1663
1664 static int
1665 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1666 {
1667         int type;
1668         struct cifs_ses *ses = sess_data->ses;
1669         struct TCP_Server_Info *server = sess_data->server;
1670
1671         type = smb2_select_sectype(server, ses->sectype);
1672         cifs_dbg(FYI, "sess setup type %d\n", type);
1673         if (type == Unspecified) {
1674                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1675                 return -EINVAL;
1676         }
1677
1678         switch (type) {
1679         case Kerberos:
1680                 sess_data->func = SMB2_auth_kerberos;
1681                 break;
1682         case RawNTLMSSP:
1683                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1684                 break;
1685         default:
1686                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1687                 return -EOPNOTSUPP;
1688         }
1689
1690         return 0;
1691 }
1692
1693 int
1694 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1695                 struct TCP_Server_Info *server,
1696                 const struct nls_table *nls_cp)
1697 {
1698         int rc = 0;
1699         struct SMB2_sess_data *sess_data;
1700
1701         cifs_dbg(FYI, "Session Setup\n");
1702
1703         if (!server) {
1704                 WARN(1, "%s: server is NULL!\n", __func__);
1705                 return -EIO;
1706         }
1707
1708         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1709         if (!sess_data)
1710                 return -ENOMEM;
1711
1712         sess_data->xid = xid;
1713         sess_data->ses = ses;
1714         sess_data->server = server;
1715         sess_data->buf0_type = CIFS_NO_BUFFER;
1716         sess_data->nls_cp = (struct nls_table *) nls_cp;
1717         sess_data->previous_session = ses->Suid;
1718
1719         rc = SMB2_select_sec(sess_data);
1720         if (rc)
1721                 goto out;
1722
1723         /*
1724          * Initialize the session hash with the server one.
1725          */
1726         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1727                SMB2_PREAUTH_HASH_SIZE);
1728
1729         while (sess_data->func)
1730                 sess_data->func(sess_data);
1731
1732         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1733                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1734         rc = sess_data->result;
1735 out:
1736         kfree(sess_data);
1737         return rc;
1738 }
1739
1740 int
1741 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1742 {
1743         struct smb_rqst rqst;
1744         struct smb2_logoff_req *req; /* response is also trivial struct */
1745         int rc = 0;
1746         struct TCP_Server_Info *server;
1747         int flags = 0;
1748         unsigned int total_len;
1749         struct kvec iov[1];
1750         struct kvec rsp_iov;
1751         int resp_buf_type;
1752
1753         cifs_dbg(FYI, "disconnect session %p\n", ses);
1754
1755         if (ses && (ses->server))
1756                 server = ses->server;
1757         else
1758                 return -EIO;
1759
1760         /* no need to send SMB logoff if uid already closed due to reconnect */
1761         spin_lock(&ses->chan_lock);
1762         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1763                 spin_unlock(&ses->chan_lock);
1764                 goto smb2_session_already_dead;
1765         }
1766         spin_unlock(&ses->chan_lock);
1767
1768         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1769                                  (void **) &req, &total_len);
1770         if (rc)
1771                 return rc;
1772
1773          /* since no tcon, smb2_init can not do this, so do here */
1774         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1775
1776         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1777                 flags |= CIFS_TRANSFORM_REQ;
1778         else if (server->sign)
1779                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1780
1781         flags |= CIFS_NO_RSP_BUF;
1782
1783         iov[0].iov_base = (char *)req;
1784         iov[0].iov_len = total_len;
1785
1786         memset(&rqst, 0, sizeof(struct smb_rqst));
1787         rqst.rq_iov = iov;
1788         rqst.rq_nvec = 1;
1789
1790         rc = cifs_send_recv(xid, ses, ses->server,
1791                             &rqst, &resp_buf_type, flags, &rsp_iov);
1792         cifs_small_buf_release(req);
1793         /*
1794          * No tcon so can't do
1795          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1796          */
1797
1798 smb2_session_already_dead:
1799         return rc;
1800 }
1801
1802 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1803 {
1804         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1805 }
1806
1807 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1808
1809 /* These are similar values to what Windows uses */
1810 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1811 {
1812         tcon->max_chunks = 256;
1813         tcon->max_bytes_chunk = 1048576;
1814         tcon->max_bytes_copy = 16777216;
1815 }
1816
1817 int
1818 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1819           struct cifs_tcon *tcon, const struct nls_table *cp)
1820 {
1821         struct smb_rqst rqst;
1822         struct smb2_tree_connect_req *req;
1823         struct smb2_tree_connect_rsp *rsp = NULL;
1824         struct kvec iov[2];
1825         struct kvec rsp_iov = { NULL, 0 };
1826         int rc = 0;
1827         int resp_buftype;
1828         int unc_path_len;
1829         __le16 *unc_path = NULL;
1830         int flags = 0;
1831         unsigned int total_len;
1832         struct TCP_Server_Info *server;
1833
1834         /* always use master channel */
1835         server = ses->server;
1836
1837         cifs_dbg(FYI, "TCON\n");
1838
1839         if (!server || !tree)
1840                 return -EIO;
1841
1842         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1843         if (unc_path == NULL)
1844                 return -ENOMEM;
1845
1846         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1847         unc_path_len *= 2;
1848         if (unc_path_len < 2) {
1849                 kfree(unc_path);
1850                 return -EINVAL;
1851         }
1852
1853         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1854         tcon->tid = 0;
1855         atomic_set(&tcon->num_remote_opens, 0);
1856         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1857                                  (void **) &req, &total_len);
1858         if (rc) {
1859                 kfree(unc_path);
1860                 return rc;
1861         }
1862
1863         if (smb3_encryption_required(tcon))
1864                 flags |= CIFS_TRANSFORM_REQ;
1865
1866         iov[0].iov_base = (char *)req;
1867         /* 1 for pad */
1868         iov[0].iov_len = total_len - 1;
1869
1870         /* Testing shows that buffer offset must be at location of Buffer[0] */
1871         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1872                         - 1 /* pad */);
1873         req->PathLength = cpu_to_le16(unc_path_len - 2);
1874         iov[1].iov_base = unc_path;
1875         iov[1].iov_len = unc_path_len;
1876
1877         /*
1878          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1879          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1880          * (Samba servers don't always set the flag so also check if null user)
1881          */
1882         if ((server->dialect == SMB311_PROT_ID) &&
1883             !smb3_encryption_required(tcon) &&
1884             !(ses->session_flags &
1885                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1886             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1887                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1888
1889         memset(&rqst, 0, sizeof(struct smb_rqst));
1890         rqst.rq_iov = iov;
1891         rqst.rq_nvec = 2;
1892
1893         /* Need 64 for max size write so ask for more in case not there yet */
1894         req->hdr.CreditRequest = cpu_to_le16(64);
1895
1896         rc = cifs_send_recv(xid, ses, server,
1897                             &rqst, &resp_buftype, flags, &rsp_iov);
1898         cifs_small_buf_release(req);
1899         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1900         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1901         if ((rc != 0) || (rsp == NULL)) {
1902                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1903                 tcon->need_reconnect = true;
1904                 goto tcon_error_exit;
1905         }
1906
1907         switch (rsp->ShareType) {
1908         case SMB2_SHARE_TYPE_DISK:
1909                 cifs_dbg(FYI, "connection to disk share\n");
1910                 break;
1911         case SMB2_SHARE_TYPE_PIPE:
1912                 tcon->pipe = true;
1913                 cifs_dbg(FYI, "connection to pipe share\n");
1914                 break;
1915         case SMB2_SHARE_TYPE_PRINT:
1916                 tcon->print = true;
1917                 cifs_dbg(FYI, "connection to printer\n");
1918                 break;
1919         default:
1920                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1921                 rc = -EOPNOTSUPP;
1922                 goto tcon_error_exit;
1923         }
1924
1925         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1926         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1927         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1928         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
1929         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1930
1931         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1932             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1933                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1934
1935         if (tcon->seal &&
1936             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1937                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1938
1939         init_copy_chunk_defaults(tcon);
1940         if (server->ops->validate_negotiate)
1941                 rc = server->ops->validate_negotiate(xid, tcon);
1942 tcon_exit:
1943
1944         free_rsp_buf(resp_buftype, rsp);
1945         kfree(unc_path);
1946         return rc;
1947
1948 tcon_error_exit:
1949         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
1950                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1951         goto tcon_exit;
1952 }
1953
1954 int
1955 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1956 {
1957         struct smb_rqst rqst;
1958         struct smb2_tree_disconnect_req *req; /* response is trivial */
1959         int rc = 0;
1960         struct cifs_ses *ses = tcon->ses;
1961         int flags = 0;
1962         unsigned int total_len;
1963         struct kvec iov[1];
1964         struct kvec rsp_iov;
1965         int resp_buf_type;
1966
1967         cifs_dbg(FYI, "Tree Disconnect\n");
1968
1969         if (!ses || !(ses->server))
1970                 return -EIO;
1971
1972         spin_lock(&ses->chan_lock);
1973         if ((tcon->need_reconnect) ||
1974             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
1975                 spin_unlock(&ses->chan_lock);
1976                 return 0;
1977         }
1978         spin_unlock(&ses->chan_lock);
1979
1980         close_cached_dir_lease(&tcon->crfid);
1981
1982         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1983                                  (void **) &req,
1984                                  &total_len);
1985         if (rc)
1986                 return rc;
1987
1988         if (smb3_encryption_required(tcon))
1989                 flags |= CIFS_TRANSFORM_REQ;
1990
1991         flags |= CIFS_NO_RSP_BUF;
1992
1993         iov[0].iov_base = (char *)req;
1994         iov[0].iov_len = total_len;
1995
1996         memset(&rqst, 0, sizeof(struct smb_rqst));
1997         rqst.rq_iov = iov;
1998         rqst.rq_nvec = 1;
1999
2000         rc = cifs_send_recv(xid, ses, ses->server,
2001                             &rqst, &resp_buf_type, flags, &rsp_iov);
2002         cifs_small_buf_release(req);
2003         if (rc)
2004                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2005
2006         return rc;
2007 }
2008
2009
2010 static struct create_durable *
2011 create_durable_buf(void)
2012 {
2013         struct create_durable *buf;
2014
2015         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2016         if (!buf)
2017                 return NULL;
2018
2019         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2020                                         (struct create_durable, Data));
2021         buf->ccontext.DataLength = cpu_to_le32(16);
2022         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2023                                 (struct create_durable, Name));
2024         buf->ccontext.NameLength = cpu_to_le16(4);
2025         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2026         buf->Name[0] = 'D';
2027         buf->Name[1] = 'H';
2028         buf->Name[2] = 'n';
2029         buf->Name[3] = 'Q';
2030         return buf;
2031 }
2032
2033 static struct create_durable *
2034 create_reconnect_durable_buf(struct cifs_fid *fid)
2035 {
2036         struct create_durable *buf;
2037
2038         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2039         if (!buf)
2040                 return NULL;
2041
2042         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2043                                         (struct create_durable, Data));
2044         buf->ccontext.DataLength = cpu_to_le32(16);
2045         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2046                                 (struct create_durable, Name));
2047         buf->ccontext.NameLength = cpu_to_le16(4);
2048         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2049         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2050         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2051         buf->Name[0] = 'D';
2052         buf->Name[1] = 'H';
2053         buf->Name[2] = 'n';
2054         buf->Name[3] = 'C';
2055         return buf;
2056 }
2057
2058 static void
2059 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2060 {
2061         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2062
2063         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2064                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2065         buf->IndexNumber = pdisk_id->DiskFileId;
2066 }
2067
2068 static void
2069 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2070                  struct create_posix_rsp *posix)
2071 {
2072         int sid_len;
2073         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2074         u8 *end = beg + le32_to_cpu(cc->DataLength);
2075         u8 *sid;
2076
2077         memset(posix, 0, sizeof(*posix));
2078
2079         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2080         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2081         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2082
2083         sid = beg + 12;
2084         sid_len = posix_info_sid_size(sid, end);
2085         if (sid_len < 0) {
2086                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2087                 return;
2088         }
2089         memcpy(&posix->owner, sid, sid_len);
2090
2091         sid = sid + sid_len;
2092         sid_len = posix_info_sid_size(sid, end);
2093         if (sid_len < 0) {
2094                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2095                 return;
2096         }
2097         memcpy(&posix->group, sid, sid_len);
2098
2099         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2100                  posix->nlink, posix->mode, posix->reparse_tag);
2101 }
2102
2103 void
2104 smb2_parse_contexts(struct TCP_Server_Info *server,
2105                     struct smb2_create_rsp *rsp,
2106                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2107                     struct smb2_file_all_info *buf,
2108                     struct create_posix_rsp *posix)
2109 {
2110         char *data_offset;
2111         struct create_context *cc;
2112         unsigned int next;
2113         unsigned int remaining;
2114         char *name;
2115         static const char smb3_create_tag_posix[] = {
2116                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2117                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2118                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2119         };
2120
2121         *oplock = 0;
2122         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2123         remaining = le32_to_cpu(rsp->CreateContextsLength);
2124         cc = (struct create_context *)data_offset;
2125
2126         /* Initialize inode number to 0 in case no valid data in qfid context */
2127         if (buf)
2128                 buf->IndexNumber = 0;
2129
2130         while (remaining >= sizeof(struct create_context)) {
2131                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2132                 if (le16_to_cpu(cc->NameLength) == 4 &&
2133                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2134                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2135                                                            lease_key);
2136                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2137                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2138                         parse_query_id_ctxt(cc, buf);
2139                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2140                         if (posix &&
2141                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2142                                 parse_posix_ctxt(cc, buf, posix);
2143                 }
2144                 /* else {
2145                         cifs_dbg(FYI, "Context not matched with len %d\n",
2146                                 le16_to_cpu(cc->NameLength));
2147                         cifs_dump_mem("Cctxt name: ", name, 4);
2148                 } */
2149
2150                 next = le32_to_cpu(cc->Next);
2151                 if (!next)
2152                         break;
2153                 remaining -= next;
2154                 cc = (struct create_context *)((char *)cc + next);
2155         }
2156
2157         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2158                 *oplock = rsp->OplockLevel;
2159
2160         return;
2161 }
2162
2163 static int
2164 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2165                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2166 {
2167         struct smb2_create_req *req = iov[0].iov_base;
2168         unsigned int num = *num_iovec;
2169
2170         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2171         if (iov[num].iov_base == NULL)
2172                 return -ENOMEM;
2173         iov[num].iov_len = server->vals->create_lease_size;
2174         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2175         if (!req->CreateContextsOffset)
2176                 req->CreateContextsOffset = cpu_to_le32(
2177                                 sizeof(struct smb2_create_req) +
2178                                 iov[num - 1].iov_len);
2179         le32_add_cpu(&req->CreateContextsLength,
2180                      server->vals->create_lease_size);
2181         *num_iovec = num + 1;
2182         return 0;
2183 }
2184
2185 static struct create_durable_v2 *
2186 create_durable_v2_buf(struct cifs_open_parms *oparms)
2187 {
2188         struct cifs_fid *pfid = oparms->fid;
2189         struct create_durable_v2 *buf;
2190
2191         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2192         if (!buf)
2193                 return NULL;
2194
2195         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2196                                         (struct create_durable_v2, dcontext));
2197         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2198         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2199                                 (struct create_durable_v2, Name));
2200         buf->ccontext.NameLength = cpu_to_le16(4);
2201
2202         /*
2203          * NB: Handle timeout defaults to 0, which allows server to choose
2204          * (most servers default to 120 seconds) and most clients default to 0.
2205          * This can be overridden at mount ("handletimeout=") if the user wants
2206          * a different persistent (or resilient) handle timeout for all opens
2207          * opens on a particular SMB3 mount.
2208          */
2209         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2210         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2211         generate_random_uuid(buf->dcontext.CreateGuid);
2212         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2213
2214         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2215         buf->Name[0] = 'D';
2216         buf->Name[1] = 'H';
2217         buf->Name[2] = '2';
2218         buf->Name[3] = 'Q';
2219         return buf;
2220 }
2221
2222 static struct create_durable_handle_reconnect_v2 *
2223 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2224 {
2225         struct create_durable_handle_reconnect_v2 *buf;
2226
2227         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2228                         GFP_KERNEL);
2229         if (!buf)
2230                 return NULL;
2231
2232         buf->ccontext.DataOffset =
2233                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2234                                      dcontext));
2235         buf->ccontext.DataLength =
2236                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2237         buf->ccontext.NameOffset =
2238                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2239                             Name));
2240         buf->ccontext.NameLength = cpu_to_le16(4);
2241
2242         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2243         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2244         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2245         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2246
2247         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2248         buf->Name[0] = 'D';
2249         buf->Name[1] = 'H';
2250         buf->Name[2] = '2';
2251         buf->Name[3] = 'C';
2252         return buf;
2253 }
2254
2255 static int
2256 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2257                     struct cifs_open_parms *oparms)
2258 {
2259         struct smb2_create_req *req = iov[0].iov_base;
2260         unsigned int num = *num_iovec;
2261
2262         iov[num].iov_base = create_durable_v2_buf(oparms);
2263         if (iov[num].iov_base == NULL)
2264                 return -ENOMEM;
2265         iov[num].iov_len = sizeof(struct create_durable_v2);
2266         if (!req->CreateContextsOffset)
2267                 req->CreateContextsOffset =
2268                         cpu_to_le32(sizeof(struct smb2_create_req) +
2269                                                                 iov[1].iov_len);
2270         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2271         *num_iovec = num + 1;
2272         return 0;
2273 }
2274
2275 static int
2276 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2277                     struct cifs_open_parms *oparms)
2278 {
2279         struct smb2_create_req *req = iov[0].iov_base;
2280         unsigned int num = *num_iovec;
2281
2282         /* indicate that we don't need to relock the file */
2283         oparms->reconnect = false;
2284
2285         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2286         if (iov[num].iov_base == NULL)
2287                 return -ENOMEM;
2288         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2289         if (!req->CreateContextsOffset)
2290                 req->CreateContextsOffset =
2291                         cpu_to_le32(sizeof(struct smb2_create_req) +
2292                                                                 iov[1].iov_len);
2293         le32_add_cpu(&req->CreateContextsLength,
2294                         sizeof(struct create_durable_handle_reconnect_v2));
2295         *num_iovec = num + 1;
2296         return 0;
2297 }
2298
2299 static int
2300 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2301                     struct cifs_open_parms *oparms, bool use_persistent)
2302 {
2303         struct smb2_create_req *req = iov[0].iov_base;
2304         unsigned int num = *num_iovec;
2305
2306         if (use_persistent) {
2307                 if (oparms->reconnect)
2308                         return add_durable_reconnect_v2_context(iov, num_iovec,
2309                                                                 oparms);
2310                 else
2311                         return add_durable_v2_context(iov, num_iovec, oparms);
2312         }
2313
2314         if (oparms->reconnect) {
2315                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2316                 /* indicate that we don't need to relock the file */
2317                 oparms->reconnect = false;
2318         } else
2319                 iov[num].iov_base = create_durable_buf();
2320         if (iov[num].iov_base == NULL)
2321                 return -ENOMEM;
2322         iov[num].iov_len = sizeof(struct create_durable);
2323         if (!req->CreateContextsOffset)
2324                 req->CreateContextsOffset =
2325                         cpu_to_le32(sizeof(struct smb2_create_req) +
2326                                                                 iov[1].iov_len);
2327         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2328         *num_iovec = num + 1;
2329         return 0;
2330 }
2331
2332 /* See MS-SMB2 2.2.13.2.7 */
2333 static struct crt_twarp_ctxt *
2334 create_twarp_buf(__u64 timewarp)
2335 {
2336         struct crt_twarp_ctxt *buf;
2337
2338         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2339         if (!buf)
2340                 return NULL;
2341
2342         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2343                                         (struct crt_twarp_ctxt, Timestamp));
2344         buf->ccontext.DataLength = cpu_to_le32(8);
2345         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2346                                 (struct crt_twarp_ctxt, Name));
2347         buf->ccontext.NameLength = cpu_to_le16(4);
2348         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2349         buf->Name[0] = 'T';
2350         buf->Name[1] = 'W';
2351         buf->Name[2] = 'r';
2352         buf->Name[3] = 'p';
2353         buf->Timestamp = cpu_to_le64(timewarp);
2354         return buf;
2355 }
2356
2357 /* See MS-SMB2 2.2.13.2.7 */
2358 static int
2359 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2360 {
2361         struct smb2_create_req *req = iov[0].iov_base;
2362         unsigned int num = *num_iovec;
2363
2364         iov[num].iov_base = create_twarp_buf(timewarp);
2365         if (iov[num].iov_base == NULL)
2366                 return -ENOMEM;
2367         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2368         if (!req->CreateContextsOffset)
2369                 req->CreateContextsOffset = cpu_to_le32(
2370                                 sizeof(struct smb2_create_req) +
2371                                 iov[num - 1].iov_len);
2372         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2373         *num_iovec = num + 1;
2374         return 0;
2375 }
2376
2377 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2378 static void setup_owner_group_sids(char *buf)
2379 {
2380         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2381
2382         /* Populate the user ownership fields S-1-5-88-1 */
2383         sids->owner.Revision = 1;
2384         sids->owner.NumAuth = 3;
2385         sids->owner.Authority[5] = 5;
2386         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2387         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2388         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2389
2390         /* Populate the group ownership fields S-1-5-88-2 */
2391         sids->group.Revision = 1;
2392         sids->group.NumAuth = 3;
2393         sids->group.Authority[5] = 5;
2394         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2395         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2396         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2397
2398         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2399 }
2400
2401 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2402 static struct crt_sd_ctxt *
2403 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2404 {
2405         struct crt_sd_ctxt *buf;
2406         __u8 *ptr, *aclptr;
2407         unsigned int acelen, acl_size, ace_count;
2408         unsigned int owner_offset = 0;
2409         unsigned int group_offset = 0;
2410         struct smb3_acl acl;
2411
2412         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2413
2414         if (set_owner) {
2415                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2416                 *len += sizeof(struct owner_group_sids);
2417         }
2418
2419         buf = kzalloc(*len, GFP_KERNEL);
2420         if (buf == NULL)
2421                 return buf;
2422
2423         ptr = (__u8 *)&buf[1];
2424         if (set_owner) {
2425                 /* offset fields are from beginning of security descriptor not of create context */
2426                 owner_offset = ptr - (__u8 *)&buf->sd;
2427                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2428                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2429                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2430
2431                 setup_owner_group_sids(ptr);
2432                 ptr += sizeof(struct owner_group_sids);
2433         } else {
2434                 buf->sd.OffsetOwner = 0;
2435                 buf->sd.OffsetGroup = 0;
2436         }
2437
2438         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2439         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2440         buf->ccontext.NameLength = cpu_to_le16(4);
2441         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2442         buf->Name[0] = 'S';
2443         buf->Name[1] = 'e';
2444         buf->Name[2] = 'c';
2445         buf->Name[3] = 'D';
2446         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2447
2448         /*
2449          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2450          * and "DP" ie the DACL is present
2451          */
2452         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2453
2454         /* offset owner, group and Sbz1 and SACL are all zero */
2455         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2456         /* Ship the ACL for now. we will copy it into buf later. */
2457         aclptr = ptr;
2458         ptr += sizeof(struct smb3_acl);
2459
2460         /* create one ACE to hold the mode embedded in reserved special SID */
2461         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2462         ptr += acelen;
2463         acl_size = acelen + sizeof(struct smb3_acl);
2464         ace_count = 1;
2465
2466         if (set_owner) {
2467                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2468                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2469                 ptr += acelen;
2470                 acl_size += acelen;
2471                 ace_count += 1;
2472         }
2473
2474         /* and one more ACE to allow access for authenticated users */
2475         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2476         ptr += acelen;
2477         acl_size += acelen;
2478         ace_count += 1;
2479
2480         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2481         acl.AclSize = cpu_to_le16(acl_size);
2482         acl.AceCount = cpu_to_le16(ace_count);
2483         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2484
2485         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2486         *len = roundup(ptr - (__u8 *)buf, 8);
2487
2488         return buf;
2489 }
2490
2491 static int
2492 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2493 {
2494         struct smb2_create_req *req = iov[0].iov_base;
2495         unsigned int num = *num_iovec;
2496         unsigned int len = 0;
2497
2498         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2499         if (iov[num].iov_base == NULL)
2500                 return -ENOMEM;
2501         iov[num].iov_len = len;
2502         if (!req->CreateContextsOffset)
2503                 req->CreateContextsOffset = cpu_to_le32(
2504                                 sizeof(struct smb2_create_req) +
2505                                 iov[num - 1].iov_len);
2506         le32_add_cpu(&req->CreateContextsLength, len);
2507         *num_iovec = num + 1;
2508         return 0;
2509 }
2510
2511 static struct crt_query_id_ctxt *
2512 create_query_id_buf(void)
2513 {
2514         struct crt_query_id_ctxt *buf;
2515
2516         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2517         if (!buf)
2518                 return NULL;
2519
2520         buf->ccontext.DataOffset = cpu_to_le16(0);
2521         buf->ccontext.DataLength = cpu_to_le32(0);
2522         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2523                                 (struct crt_query_id_ctxt, Name));
2524         buf->ccontext.NameLength = cpu_to_le16(4);
2525         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2526         buf->Name[0] = 'Q';
2527         buf->Name[1] = 'F';
2528         buf->Name[2] = 'i';
2529         buf->Name[3] = 'd';
2530         return buf;
2531 }
2532
2533 /* See MS-SMB2 2.2.13.2.9 */
2534 static int
2535 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2536 {
2537         struct smb2_create_req *req = iov[0].iov_base;
2538         unsigned int num = *num_iovec;
2539
2540         iov[num].iov_base = create_query_id_buf();
2541         if (iov[num].iov_base == NULL)
2542                 return -ENOMEM;
2543         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2544         if (!req->CreateContextsOffset)
2545                 req->CreateContextsOffset = cpu_to_le32(
2546                                 sizeof(struct smb2_create_req) +
2547                                 iov[num - 1].iov_len);
2548         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2549         *num_iovec = num + 1;
2550         return 0;
2551 }
2552
2553 static int
2554 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2555                             const char *treename, const __le16 *path)
2556 {
2557         int treename_len, path_len;
2558         struct nls_table *cp;
2559         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2560
2561         /*
2562          * skip leading "\\"
2563          */
2564         treename_len = strlen(treename);
2565         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2566                 return -EINVAL;
2567
2568         treename += 2;
2569         treename_len -= 2;
2570
2571         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2572
2573         /*
2574          * make room for one path separator between the treename and
2575          * path
2576          */
2577         *out_len = treename_len + 1 + path_len;
2578
2579         /*
2580          * final path needs to be null-terminated UTF16 with a
2581          * size aligned to 8
2582          */
2583
2584         *out_size = roundup((*out_len+1)*2, 8);
2585         *out_path = kzalloc(*out_size, GFP_KERNEL);
2586         if (!*out_path)
2587                 return -ENOMEM;
2588
2589         cp = load_nls_default();
2590         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2591
2592         /* Do not append the separator if the path is empty */
2593         if (path[0] != cpu_to_le16(0x0000)) {
2594                 UniStrcat(*out_path, sep);
2595                 UniStrcat(*out_path, path);
2596         }
2597
2598         unload_nls(cp);
2599
2600         return 0;
2601 }
2602
2603 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2604                                umode_t mode, struct cifs_tcon *tcon,
2605                                const char *full_path,
2606                                struct cifs_sb_info *cifs_sb)
2607 {
2608         struct smb_rqst rqst;
2609         struct smb2_create_req *req;
2610         struct smb2_create_rsp *rsp = NULL;
2611         struct cifs_ses *ses = tcon->ses;
2612         struct kvec iov[3]; /* make sure at least one for each open context */
2613         struct kvec rsp_iov = {NULL, 0};
2614         int resp_buftype;
2615         int uni_path_len;
2616         __le16 *copy_path = NULL;
2617         int copy_size;
2618         int rc = 0;
2619         unsigned int n_iov = 2;
2620         __u32 file_attributes = 0;
2621         char *pc_buf = NULL;
2622         int flags = 0;
2623         unsigned int total_len;
2624         __le16 *utf16_path = NULL;
2625         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2626
2627         cifs_dbg(FYI, "mkdir\n");
2628
2629         /* resource #1: path allocation */
2630         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2631         if (!utf16_path)
2632                 return -ENOMEM;
2633
2634         if (!ses || !server) {
2635                 rc = -EIO;
2636                 goto err_free_path;
2637         }
2638
2639         /* resource #2: request */
2640         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2641                                  (void **) &req, &total_len);
2642         if (rc)
2643                 goto err_free_path;
2644
2645
2646         if (smb3_encryption_required(tcon))
2647                 flags |= CIFS_TRANSFORM_REQ;
2648
2649         req->ImpersonationLevel = IL_IMPERSONATION;
2650         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2651         /* File attributes ignored on open (used in create though) */
2652         req->FileAttributes = cpu_to_le32(file_attributes);
2653         req->ShareAccess = FILE_SHARE_ALL_LE;
2654         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2655         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2656
2657         iov[0].iov_base = (char *)req;
2658         /* -1 since last byte is buf[0] which is sent below (path) */
2659         iov[0].iov_len = total_len - 1;
2660
2661         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2662
2663         /* [MS-SMB2] 2.2.13 NameOffset:
2664          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2665          * the SMB2 header, the file name includes a prefix that will
2666          * be processed during DFS name normalization as specified in
2667          * section 3.3.5.9. Otherwise, the file name is relative to
2668          * the share that is identified by the TreeId in the SMB2
2669          * header.
2670          */
2671         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2672                 int name_len;
2673
2674                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2675                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2676                                                  &name_len,
2677                                                  tcon->treeName, utf16_path);
2678                 if (rc)
2679                         goto err_free_req;
2680
2681                 req->NameLength = cpu_to_le16(name_len * 2);
2682                 uni_path_len = copy_size;
2683                 /* free before overwriting resource */
2684                 kfree(utf16_path);
2685                 utf16_path = copy_path;
2686         } else {
2687                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2688                 /* MUST set path len (NameLength) to 0 opening root of share */
2689                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2690                 if (uni_path_len % 8 != 0) {
2691                         copy_size = roundup(uni_path_len, 8);
2692                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2693                         if (!copy_path) {
2694                                 rc = -ENOMEM;
2695                                 goto err_free_req;
2696                         }
2697                         memcpy((char *)copy_path, (const char *)utf16_path,
2698                                uni_path_len);
2699                         uni_path_len = copy_size;
2700                         /* free before overwriting resource */
2701                         kfree(utf16_path);
2702                         utf16_path = copy_path;
2703                 }
2704         }
2705
2706         iov[1].iov_len = uni_path_len;
2707         iov[1].iov_base = utf16_path;
2708         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2709
2710         if (tcon->posix_extensions) {
2711                 /* resource #3: posix buf */
2712                 rc = add_posix_context(iov, &n_iov, mode);
2713                 if (rc)
2714                         goto err_free_req;
2715                 pc_buf = iov[n_iov-1].iov_base;
2716         }
2717
2718
2719         memset(&rqst, 0, sizeof(struct smb_rqst));
2720         rqst.rq_iov = iov;
2721         rqst.rq_nvec = n_iov;
2722
2723         /* no need to inc num_remote_opens because we close it just below */
2724         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2725                                     FILE_WRITE_ATTRIBUTES);
2726         /* resource #4: response buffer */
2727         rc = cifs_send_recv(xid, ses, server,
2728                             &rqst, &resp_buftype, flags, &rsp_iov);
2729         if (rc) {
2730                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2731                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2732                                            CREATE_NOT_FILE,
2733                                            FILE_WRITE_ATTRIBUTES, rc);
2734                 goto err_free_rsp_buf;
2735         }
2736
2737         /*
2738          * Although unlikely to be possible for rsp to be null and rc not set,
2739          * adding check below is slightly safer long term (and quiets Coverity
2740          * warning)
2741          */
2742         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2743         if (rsp == NULL) {
2744                 rc = -EIO;
2745                 kfree(pc_buf);
2746                 goto err_free_req;
2747         }
2748
2749         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2750                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2751
2752         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2753
2754         /* Eventually save off posix specific response info and timestaps */
2755
2756 err_free_rsp_buf:
2757         free_rsp_buf(resp_buftype, rsp);
2758         kfree(pc_buf);
2759 err_free_req:
2760         cifs_small_buf_release(req);
2761 err_free_path:
2762         kfree(utf16_path);
2763         return rc;
2764 }
2765
2766 int
2767 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2768                struct smb_rqst *rqst, __u8 *oplock,
2769                struct cifs_open_parms *oparms, __le16 *path)
2770 {
2771         struct smb2_create_req *req;
2772         unsigned int n_iov = 2;
2773         __u32 file_attributes = 0;
2774         int copy_size;
2775         int uni_path_len;
2776         unsigned int total_len;
2777         struct kvec *iov = rqst->rq_iov;
2778         __le16 *copy_path;
2779         int rc;
2780
2781         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2782                                  (void **) &req, &total_len);
2783         if (rc)
2784                 return rc;
2785
2786         iov[0].iov_base = (char *)req;
2787         /* -1 since last byte is buf[0] which is sent below (path) */
2788         iov[0].iov_len = total_len - 1;
2789
2790         if (oparms->create_options & CREATE_OPTION_READONLY)
2791                 file_attributes |= ATTR_READONLY;
2792         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2793                 file_attributes |= ATTR_SYSTEM;
2794
2795         req->ImpersonationLevel = IL_IMPERSONATION;
2796         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2797         /* File attributes ignored on open (used in create though) */
2798         req->FileAttributes = cpu_to_le32(file_attributes);
2799         req->ShareAccess = FILE_SHARE_ALL_LE;
2800
2801         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2802         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2803         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2804
2805         /* [MS-SMB2] 2.2.13 NameOffset:
2806          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2807          * the SMB2 header, the file name includes a prefix that will
2808          * be processed during DFS name normalization as specified in
2809          * section 3.3.5.9. Otherwise, the file name is relative to
2810          * the share that is identified by the TreeId in the SMB2
2811          * header.
2812          */
2813         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2814                 int name_len;
2815
2816                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2817                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2818                                                  &name_len,
2819                                                  tcon->treeName, path);
2820                 if (rc)
2821                         return rc;
2822                 req->NameLength = cpu_to_le16(name_len * 2);
2823                 uni_path_len = copy_size;
2824                 path = copy_path;
2825         } else {
2826                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2827                 /* MUST set path len (NameLength) to 0 opening root of share */
2828                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2829                 copy_size = uni_path_len;
2830                 if (copy_size % 8 != 0)
2831                         copy_size = roundup(copy_size, 8);
2832                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2833                 if (!copy_path)
2834                         return -ENOMEM;
2835                 memcpy((char *)copy_path, (const char *)path,
2836                        uni_path_len);
2837                 uni_path_len = copy_size;
2838                 path = copy_path;
2839         }
2840
2841         iov[1].iov_len = uni_path_len;
2842         iov[1].iov_base = path;
2843
2844         if ((!server->oplocks) || (tcon->no_lease))
2845                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2846
2847         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2848             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2849                 req->RequestedOplockLevel = *oplock;
2850         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2851                   (oparms->create_options & CREATE_NOT_FILE))
2852                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2853         else {
2854                 rc = add_lease_context(server, iov, &n_iov,
2855                                        oparms->fid->lease_key, oplock);
2856                 if (rc)
2857                         return rc;
2858         }
2859
2860         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2861                 /* need to set Next field of lease context if we request it */
2862                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2863                         struct create_context *ccontext =
2864                             (struct create_context *)iov[n_iov-1].iov_base;
2865                         ccontext->Next =
2866                                 cpu_to_le32(server->vals->create_lease_size);
2867                 }
2868
2869                 rc = add_durable_context(iov, &n_iov, oparms,
2870                                         tcon->use_persistent);
2871                 if (rc)
2872                         return rc;
2873         }
2874
2875         if (tcon->posix_extensions) {
2876                 if (n_iov > 2) {
2877                         struct create_context *ccontext =
2878                             (struct create_context *)iov[n_iov-1].iov_base;
2879                         ccontext->Next =
2880                                 cpu_to_le32(iov[n_iov-1].iov_len);
2881                 }
2882
2883                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2884                 if (rc)
2885                         return rc;
2886         }
2887
2888         if (tcon->snapshot_time) {
2889                 cifs_dbg(FYI, "adding snapshot context\n");
2890                 if (n_iov > 2) {
2891                         struct create_context *ccontext =
2892                             (struct create_context *)iov[n_iov-1].iov_base;
2893                         ccontext->Next =
2894                                 cpu_to_le32(iov[n_iov-1].iov_len);
2895                 }
2896
2897                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2898                 if (rc)
2899                         return rc;
2900         }
2901
2902         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2903                 bool set_mode;
2904                 bool set_owner;
2905
2906                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2907                     (oparms->mode != ACL_NO_MODE))
2908                         set_mode = true;
2909                 else {
2910                         set_mode = false;
2911                         oparms->mode = ACL_NO_MODE;
2912                 }
2913
2914                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2915                         set_owner = true;
2916                 else
2917                         set_owner = false;
2918
2919                 if (set_owner | set_mode) {
2920                         if (n_iov > 2) {
2921                                 struct create_context *ccontext =
2922                                     (struct create_context *)iov[n_iov-1].iov_base;
2923                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2924                         }
2925
2926                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2927                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2928                         if (rc)
2929                                 return rc;
2930                 }
2931         }
2932
2933         if (n_iov > 2) {
2934                 struct create_context *ccontext =
2935                         (struct create_context *)iov[n_iov-1].iov_base;
2936                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2937         }
2938         add_query_id_context(iov, &n_iov);
2939
2940         rqst->rq_nvec = n_iov;
2941         return 0;
2942 }
2943
2944 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2945  * All other vectors are freed by kfree().
2946  */
2947 void
2948 SMB2_open_free(struct smb_rqst *rqst)
2949 {
2950         int i;
2951
2952         if (rqst && rqst->rq_iov) {
2953                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2954                 for (i = 1; i < rqst->rq_nvec; i++)
2955                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2956                                 kfree(rqst->rq_iov[i].iov_base);
2957         }
2958 }
2959
2960 int
2961 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2962           __u8 *oplock, struct smb2_file_all_info *buf,
2963           struct create_posix_rsp *posix,
2964           struct kvec *err_iov, int *buftype)
2965 {
2966         struct smb_rqst rqst;
2967         struct smb2_create_rsp *rsp = NULL;
2968         struct cifs_tcon *tcon = oparms->tcon;
2969         struct cifs_ses *ses = tcon->ses;
2970         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2971         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2972         struct kvec rsp_iov = {NULL, 0};
2973         int resp_buftype = CIFS_NO_BUFFER;
2974         int rc = 0;
2975         int flags = 0;
2976
2977         cifs_dbg(FYI, "create/open\n");
2978         if (!ses || !server)
2979                 return -EIO;
2980
2981         if (smb3_encryption_required(tcon))
2982                 flags |= CIFS_TRANSFORM_REQ;
2983
2984         memset(&rqst, 0, sizeof(struct smb_rqst));
2985         memset(&iov, 0, sizeof(iov));
2986         rqst.rq_iov = iov;
2987         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2988
2989         rc = SMB2_open_init(tcon, server,
2990                             &rqst, oplock, oparms, path);
2991         if (rc)
2992                 goto creat_exit;
2993
2994         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2995                 oparms->create_options, oparms->desired_access);
2996
2997         rc = cifs_send_recv(xid, ses, server,
2998                             &rqst, &resp_buftype, flags,
2999                             &rsp_iov);
3000         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3001
3002         if (rc != 0) {
3003                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3004                 if (err_iov && rsp) {
3005                         *err_iov = rsp_iov;
3006                         *buftype = resp_buftype;
3007                         resp_buftype = CIFS_NO_BUFFER;
3008                         rsp = NULL;
3009                 }
3010                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3011                                     oparms->create_options, oparms->desired_access, rc);
3012                 if (rc == -EREMCHG) {
3013                         pr_warn_once("server share %s deleted\n",
3014                                      tcon->treeName);
3015                         tcon->need_reconnect = true;
3016                 }
3017                 goto creat_exit;
3018         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3019                 goto creat_exit;
3020         else
3021                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3022                                      oparms->create_options, oparms->desired_access);
3023
3024         atomic_inc(&tcon->num_remote_opens);
3025         oparms->fid->persistent_fid = rsp->PersistentFileId;
3026         oparms->fid->volatile_fid = rsp->VolatileFileId;
3027         oparms->fid->access = oparms->desired_access;
3028 #ifdef CONFIG_CIFS_DEBUG2
3029         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3030 #endif /* CIFS_DEBUG2 */
3031
3032         if (buf) {
3033                 buf->CreationTime = rsp->CreationTime;
3034                 buf->LastAccessTime = rsp->LastAccessTime;
3035                 buf->LastWriteTime = rsp->LastWriteTime;
3036                 buf->ChangeTime = rsp->ChangeTime;
3037                 buf->AllocationSize = rsp->AllocationSize;
3038                 buf->EndOfFile = rsp->EndofFile;
3039                 buf->Attributes = rsp->FileAttributes;
3040                 buf->NumberOfLinks = cpu_to_le32(1);
3041                 buf->DeletePending = 0;
3042         }
3043
3044
3045         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
3046                             oparms->fid->lease_key, oplock, buf, posix);
3047 creat_exit:
3048         SMB2_open_free(&rqst);
3049         free_rsp_buf(resp_buftype, rsp);
3050         return rc;
3051 }
3052
3053 int
3054 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3055                 struct smb_rqst *rqst,
3056                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3057                 bool is_fsctl, char *in_data, u32 indatalen,
3058                 __u32 max_response_size)
3059 {
3060         struct smb2_ioctl_req *req;
3061         struct kvec *iov = rqst->rq_iov;
3062         unsigned int total_len;
3063         int rc;
3064         char *in_data_buf;
3065
3066         rc = smb2_ioctl_req_init(opcode, tcon, server,
3067                                  (void **) &req, &total_len);
3068         if (rc)
3069                 return rc;
3070
3071         if (indatalen) {
3072                 /*
3073                  * indatalen is usually small at a couple of bytes max, so
3074                  * just allocate through generic pool
3075                  */
3076                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3077                 if (!in_data_buf) {
3078                         cifs_small_buf_release(req);
3079                         return -ENOMEM;
3080                 }
3081         }
3082
3083         req->CtlCode = cpu_to_le32(opcode);
3084         req->PersistentFileId = persistent_fid;
3085         req->VolatileFileId = volatile_fid;
3086
3087         iov[0].iov_base = (char *)req;
3088         /*
3089          * If no input data, the size of ioctl struct in
3090          * protocol spec still includes a 1 byte data buffer,
3091          * but if input data passed to ioctl, we do not
3092          * want to double count this, so we do not send
3093          * the dummy one byte of data in iovec[0] if sending
3094          * input data (in iovec[1]).
3095          */
3096         if (indatalen) {
3097                 req->InputCount = cpu_to_le32(indatalen);
3098                 /* do not set InputOffset if no input data */
3099                 req->InputOffset =
3100                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3101                 rqst->rq_nvec = 2;
3102                 iov[0].iov_len = total_len - 1;
3103                 iov[1].iov_base = in_data_buf;
3104                 iov[1].iov_len = indatalen;
3105         } else {
3106                 rqst->rq_nvec = 1;
3107                 iov[0].iov_len = total_len;
3108         }
3109
3110         req->OutputOffset = 0;
3111         req->OutputCount = 0; /* MBZ */
3112
3113         /*
3114          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3115          * We Could increase default MaxOutputResponse, but that could require
3116          * more credits. Windows typically sets this smaller, but for some
3117          * ioctls it may be useful to allow server to send more. No point
3118          * limiting what the server can send as long as fits in one credit
3119          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3120          * to increase this limit up in the future.
3121          * Note that for snapshot queries that servers like Azure expect that
3122          * the first query be minimal size (and just used to get the number/size
3123          * of previous versions) so response size must be specified as EXACTLY
3124          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3125          * of eight bytes.  Currently that is the only case where we set max
3126          * response size smaller.
3127          */
3128         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3129         req->hdr.CreditCharge =
3130                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3131                                          SMB2_MAX_BUFFER_SIZE));
3132         if (is_fsctl)
3133                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3134         else
3135                 req->Flags = 0;
3136
3137         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3138         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3139                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3140
3141         return 0;
3142 }
3143
3144 void
3145 SMB2_ioctl_free(struct smb_rqst *rqst)
3146 {
3147         int i;
3148         if (rqst && rqst->rq_iov) {
3149                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3150                 for (i = 1; i < rqst->rq_nvec; i++)
3151                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3152                                 kfree(rqst->rq_iov[i].iov_base);
3153         }
3154 }
3155
3156
3157 /*
3158  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3159  */
3160 int
3161 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3162            u64 volatile_fid, u32 opcode, bool is_fsctl,
3163            char *in_data, u32 indatalen, u32 max_out_data_len,
3164            char **out_data, u32 *plen /* returned data len */)
3165 {
3166         struct smb_rqst rqst;
3167         struct smb2_ioctl_rsp *rsp = NULL;
3168         struct cifs_ses *ses;
3169         struct TCP_Server_Info *server;
3170         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3171         struct kvec rsp_iov = {NULL, 0};
3172         int resp_buftype = CIFS_NO_BUFFER;
3173         int rc = 0;
3174         int flags = 0;
3175
3176         cifs_dbg(FYI, "SMB2 IOCTL\n");
3177
3178         if (out_data != NULL)
3179                 *out_data = NULL;
3180
3181         /* zero out returned data len, in case of error */
3182         if (plen)
3183                 *plen = 0;
3184
3185         if (!tcon)
3186                 return -EIO;
3187
3188         ses = tcon->ses;
3189         if (!ses)
3190                 return -EIO;
3191
3192         server = cifs_pick_channel(ses);
3193         if (!server)
3194                 return -EIO;
3195
3196         if (smb3_encryption_required(tcon))
3197                 flags |= CIFS_TRANSFORM_REQ;
3198
3199         memset(&rqst, 0, sizeof(struct smb_rqst));
3200         memset(&iov, 0, sizeof(iov));
3201         rqst.rq_iov = iov;
3202         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3203
3204         rc = SMB2_ioctl_init(tcon, server,
3205                              &rqst, persistent_fid, volatile_fid, opcode,
3206                              is_fsctl, in_data, indatalen, max_out_data_len);
3207         if (rc)
3208                 goto ioctl_exit;
3209
3210         rc = cifs_send_recv(xid, ses, server,
3211                             &rqst, &resp_buftype, flags,
3212                             &rsp_iov);
3213         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3214
3215         if (rc != 0)
3216                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3217                                 ses->Suid, 0, opcode, rc);
3218
3219         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3220                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3221                 goto ioctl_exit;
3222         } else if (rc == -EINVAL) {
3223                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3224                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3225                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3226                         goto ioctl_exit;
3227                 }
3228         } else if (rc == -E2BIG) {
3229                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3230                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3231                         goto ioctl_exit;
3232                 }
3233         }
3234
3235         /* check if caller wants to look at return data or just return rc */
3236         if ((plen == NULL) || (out_data == NULL))
3237                 goto ioctl_exit;
3238
3239         /*
3240          * Although unlikely to be possible for rsp to be null and rc not set,
3241          * adding check below is slightly safer long term (and quiets Coverity
3242          * warning)
3243          */
3244         if (rsp == NULL) {
3245                 rc = -EIO;
3246                 goto ioctl_exit;
3247         }
3248
3249         *plen = le32_to_cpu(rsp->OutputCount);
3250
3251         /* We check for obvious errors in the output buffer length and offset */
3252         if (*plen == 0)
3253                 goto ioctl_exit; /* server returned no data */
3254         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3255                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3256                 *plen = 0;
3257                 rc = -EIO;
3258                 goto ioctl_exit;
3259         }
3260
3261         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3262                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3263                         le32_to_cpu(rsp->OutputOffset));
3264                 *plen = 0;
3265                 rc = -EIO;
3266                 goto ioctl_exit;
3267         }
3268
3269         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3270                             *plen, GFP_KERNEL);
3271         if (*out_data == NULL) {
3272                 rc = -ENOMEM;
3273                 goto ioctl_exit;
3274         }
3275
3276 ioctl_exit:
3277         SMB2_ioctl_free(&rqst);
3278         free_rsp_buf(resp_buftype, rsp);
3279         return rc;
3280 }
3281
3282 /*
3283  *   Individual callers to ioctl worker function follow
3284  */
3285
3286 int
3287 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3288                      u64 persistent_fid, u64 volatile_fid)
3289 {
3290         int rc;
3291         struct  compress_ioctl fsctl_input;
3292         char *ret_data = NULL;
3293
3294         fsctl_input.CompressionState =
3295                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3296
3297         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3298                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3299                         (char *)&fsctl_input /* data input */,
3300                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3301                         &ret_data /* out data */, NULL);
3302
3303         cifs_dbg(FYI, "set compression rc %d\n", rc);
3304
3305         return rc;
3306 }
3307
3308 int
3309 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3310                 struct smb_rqst *rqst,
3311                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3312 {
3313         struct smb2_close_req *req;
3314         struct kvec *iov = rqst->rq_iov;
3315         unsigned int total_len;
3316         int rc;
3317
3318         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3319                                  (void **) &req, &total_len);
3320         if (rc)
3321                 return rc;
3322
3323         req->PersistentFileId = persistent_fid;
3324         req->VolatileFileId = volatile_fid;
3325         if (query_attrs)
3326                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3327         else
3328                 req->Flags = 0;
3329         iov[0].iov_base = (char *)req;
3330         iov[0].iov_len = total_len;
3331
3332         return 0;
3333 }
3334
3335 void
3336 SMB2_close_free(struct smb_rqst *rqst)
3337 {
3338         if (rqst && rqst->rq_iov)
3339                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3340 }
3341
3342 int
3343 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3344              u64 persistent_fid, u64 volatile_fid,
3345              struct smb2_file_network_open_info *pbuf)
3346 {
3347         struct smb_rqst rqst;
3348         struct smb2_close_rsp *rsp = NULL;
3349         struct cifs_ses *ses = tcon->ses;
3350         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3351         struct kvec iov[1];
3352         struct kvec rsp_iov;
3353         int resp_buftype = CIFS_NO_BUFFER;
3354         int rc = 0;
3355         int flags = 0;
3356         bool query_attrs = false;
3357
3358         cifs_dbg(FYI, "Close\n");
3359
3360         if (!ses || !server)
3361                 return -EIO;
3362
3363         if (smb3_encryption_required(tcon))
3364                 flags |= CIFS_TRANSFORM_REQ;
3365
3366         memset(&rqst, 0, sizeof(struct smb_rqst));
3367         memset(&iov, 0, sizeof(iov));
3368         rqst.rq_iov = iov;
3369         rqst.rq_nvec = 1;
3370
3371         /* check if need to ask server to return timestamps in close response */
3372         if (pbuf)
3373                 query_attrs = true;
3374
3375         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3376         rc = SMB2_close_init(tcon, server,
3377                              &rqst, persistent_fid, volatile_fid,
3378                              query_attrs);
3379         if (rc)
3380                 goto close_exit;
3381
3382         rc = cifs_send_recv(xid, ses, server,
3383                             &rqst, &resp_buftype, flags, &rsp_iov);
3384         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3385
3386         if (rc != 0) {
3387                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3388                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3389                                      rc);
3390                 goto close_exit;
3391         } else {
3392                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3393                                       ses->Suid);
3394                 /*
3395                  * Note that have to subtract 4 since struct network_open_info
3396                  * has a final 4 byte pad that close response does not have
3397                  */
3398                 if (pbuf)
3399                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3400         }
3401
3402         atomic_dec(&tcon->num_remote_opens);
3403 close_exit:
3404         SMB2_close_free(&rqst);
3405         free_rsp_buf(resp_buftype, rsp);
3406
3407         /* retry close in a worker thread if this one is interrupted */
3408         if (is_interrupt_error(rc)) {
3409                 int tmp_rc;
3410
3411                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3412                                                      volatile_fid);
3413                 if (tmp_rc)
3414                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3415                                  persistent_fid, tmp_rc);
3416         }
3417         return rc;
3418 }
3419
3420 int
3421 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3422                 u64 persistent_fid, u64 volatile_fid)
3423 {
3424         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3425 }
3426
3427 int
3428 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3429                   struct kvec *iov, unsigned int min_buf_size)
3430 {
3431         unsigned int smb_len = iov->iov_len;
3432         char *end_of_smb = smb_len + (char *)iov->iov_base;
3433         char *begin_of_buf = offset + (char *)iov->iov_base;
3434         char *end_of_buf = begin_of_buf + buffer_length;
3435
3436
3437         if (buffer_length < min_buf_size) {
3438                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3439                          buffer_length, min_buf_size);
3440                 return -EINVAL;
3441         }
3442
3443         /* check if beyond RFC1001 maximum length */
3444         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3445                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3446                          buffer_length, smb_len);
3447                 return -EINVAL;
3448         }
3449
3450         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3451                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3452                 return -EINVAL;
3453         }
3454
3455         return 0;
3456 }
3457
3458 /*
3459  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3460  * Caller must free buffer.
3461  */
3462 int
3463 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3464                            struct kvec *iov, unsigned int minbufsize,
3465                            char *data)
3466 {
3467         char *begin_of_buf = offset + (char *)iov->iov_base;
3468         int rc;
3469
3470         if (!data)
3471                 return -EINVAL;
3472
3473         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3474         if (rc)
3475                 return rc;
3476
3477         memcpy(data, begin_of_buf, buffer_length);
3478
3479         return 0;
3480 }
3481
3482 int
3483 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3484                      struct smb_rqst *rqst,
3485                      u64 persistent_fid, u64 volatile_fid,
3486                      u8 info_class, u8 info_type, u32 additional_info,
3487                      size_t output_len, size_t input_len, void *input)
3488 {
3489         struct smb2_query_info_req *req;
3490         struct kvec *iov = rqst->rq_iov;
3491         unsigned int total_len;
3492         int rc;
3493
3494         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3495                                  (void **) &req, &total_len);
3496         if (rc)
3497                 return rc;
3498
3499         req->InfoType = info_type;
3500         req->FileInfoClass = info_class;
3501         req->PersistentFileId = persistent_fid;
3502         req->VolatileFileId = volatile_fid;
3503         req->AdditionalInformation = cpu_to_le32(additional_info);
3504
3505         req->OutputBufferLength = cpu_to_le32(output_len);
3506         if (input_len) {
3507                 req->InputBufferLength = cpu_to_le32(input_len);
3508                 /* total_len for smb query request never close to le16 max */
3509                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3510                 memcpy(req->Buffer, input, input_len);
3511         }
3512
3513         iov[0].iov_base = (char *)req;
3514         /* 1 for Buffer */
3515         iov[0].iov_len = total_len - 1 + input_len;
3516         return 0;
3517 }
3518
3519 void
3520 SMB2_query_info_free(struct smb_rqst *rqst)
3521 {
3522         if (rqst && rqst->rq_iov)
3523                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3524 }
3525
3526 static int
3527 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3528            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3529            u32 additional_info, size_t output_len, size_t min_len, void **data,
3530                 u32 *dlen)
3531 {
3532         struct smb_rqst rqst;
3533         struct smb2_query_info_rsp *rsp = NULL;
3534         struct kvec iov[1];
3535         struct kvec rsp_iov;
3536         int rc = 0;
3537         int resp_buftype = CIFS_NO_BUFFER;
3538         struct cifs_ses *ses = tcon->ses;
3539         struct TCP_Server_Info *server;
3540         int flags = 0;
3541         bool allocated = false;
3542
3543         cifs_dbg(FYI, "Query Info\n");
3544
3545         if (!ses)
3546                 return -EIO;
3547         server = cifs_pick_channel(ses);
3548         if (!server)
3549                 return -EIO;
3550
3551         if (smb3_encryption_required(tcon))
3552                 flags |= CIFS_TRANSFORM_REQ;
3553
3554         memset(&rqst, 0, sizeof(struct smb_rqst));
3555         memset(&iov, 0, sizeof(iov));
3556         rqst.rq_iov = iov;
3557         rqst.rq_nvec = 1;
3558
3559         rc = SMB2_query_info_init(tcon, server,
3560                                   &rqst, persistent_fid, volatile_fid,
3561                                   info_class, info_type, additional_info,
3562                                   output_len, 0, NULL);
3563         if (rc)
3564                 goto qinf_exit;
3565
3566         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3567                                     ses->Suid, info_class, (__u32)info_type);
3568
3569         rc = cifs_send_recv(xid, ses, server,
3570                             &rqst, &resp_buftype, flags, &rsp_iov);
3571         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3572
3573         if (rc) {
3574                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3575                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3576                                 ses->Suid, info_class, (__u32)info_type, rc);
3577                 goto qinf_exit;
3578         }
3579
3580         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3581                                 ses->Suid, info_class, (__u32)info_type);
3582
3583         if (dlen) {
3584                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3585                 if (!*data) {
3586                         *data = kmalloc(*dlen, GFP_KERNEL);
3587                         if (!*data) {
3588                                 cifs_tcon_dbg(VFS,
3589                                         "Error %d allocating memory for acl\n",
3590                                         rc);
3591                                 *dlen = 0;
3592                                 rc = -ENOMEM;
3593                                 goto qinf_exit;
3594                         }
3595                         allocated = true;
3596                 }
3597         }
3598
3599         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3600                                         le32_to_cpu(rsp->OutputBufferLength),
3601                                         &rsp_iov, min_len, *data);
3602         if (rc && allocated) {
3603                 kfree(*data);
3604                 *data = NULL;
3605                 *dlen = 0;
3606         }
3607
3608 qinf_exit:
3609         SMB2_query_info_free(&rqst);
3610         free_rsp_buf(resp_buftype, rsp);
3611         return rc;
3612 }
3613
3614 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3615         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3616 {
3617         return query_info(xid, tcon, persistent_fid, volatile_fid,
3618                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3619                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3620                           sizeof(struct smb2_file_all_info), (void **)&data,
3621                           NULL);
3622 }
3623
3624 #if 0
3625 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3626 int
3627 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3628                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3629 {
3630         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3631                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3632         *plen = 0;
3633
3634         return query_info(xid, tcon, persistent_fid, volatile_fid,
3635                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3636                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3637         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3638 }
3639 #endif
3640
3641 int
3642 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3643                u64 persistent_fid, u64 volatile_fid,
3644                void **data, u32 *plen, u32 extra_info)
3645 {
3646         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3647                                 extra_info;
3648         *plen = 0;
3649
3650         return query_info(xid, tcon, persistent_fid, volatile_fid,
3651                           0, SMB2_O_INFO_SECURITY, additional_info,
3652                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3653 }
3654
3655 int
3656 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3657                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3658 {
3659         return query_info(xid, tcon, persistent_fid, volatile_fid,
3660                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3661                           sizeof(struct smb2_file_internal_info),
3662                           sizeof(struct smb2_file_internal_info),
3663                           (void **)&uniqueid, NULL);
3664 }
3665
3666 /*
3667  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3668  * See MS-SMB2 2.2.35 and 2.2.36
3669  */
3670
3671 static int
3672 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3673                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3674                  u64 persistent_fid, u64 volatile_fid,
3675                  u32 completion_filter, bool watch_tree)
3676 {
3677         struct smb2_change_notify_req *req;
3678         struct kvec *iov = rqst->rq_iov;
3679         unsigned int total_len;
3680         int rc;
3681
3682         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3683                                  (void **) &req, &total_len);
3684         if (rc)
3685                 return rc;
3686
3687         req->PersistentFileId = persistent_fid;
3688         req->VolatileFileId = volatile_fid;
3689         /* See note 354 of MS-SMB2, 64K max */
3690         req->OutputBufferLength =
3691                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3692         req->CompletionFilter = cpu_to_le32(completion_filter);
3693         if (watch_tree)
3694                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3695         else
3696                 req->Flags = 0;
3697
3698         iov[0].iov_base = (char *)req;
3699         iov[0].iov_len = total_len;
3700
3701         return 0;
3702 }
3703
3704 int
3705 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3706                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3707                 u32 completion_filter)
3708 {
3709         struct cifs_ses *ses = tcon->ses;
3710         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3711         struct smb_rqst rqst;
3712         struct kvec iov[1];
3713         struct kvec rsp_iov = {NULL, 0};
3714         int resp_buftype = CIFS_NO_BUFFER;
3715         int flags = 0;
3716         int rc = 0;
3717
3718         cifs_dbg(FYI, "change notify\n");
3719         if (!ses || !server)
3720                 return -EIO;
3721
3722         if (smb3_encryption_required(tcon))
3723                 flags |= CIFS_TRANSFORM_REQ;
3724
3725         memset(&rqst, 0, sizeof(struct smb_rqst));
3726         memset(&iov, 0, sizeof(iov));
3727         rqst.rq_iov = iov;
3728         rqst.rq_nvec = 1;
3729
3730         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3731                               persistent_fid, volatile_fid,
3732                               completion_filter, watch_tree);
3733         if (rc)
3734                 goto cnotify_exit;
3735
3736         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3737                                 (u8)watch_tree, completion_filter);
3738         rc = cifs_send_recv(xid, ses, server,
3739                             &rqst, &resp_buftype, flags, &rsp_iov);
3740
3741         if (rc != 0) {
3742                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3743                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3744                                 (u8)watch_tree, completion_filter, rc);
3745         } else
3746                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3747                                 ses->Suid, (u8)watch_tree, completion_filter);
3748
3749  cnotify_exit:
3750         if (rqst.rq_iov)
3751                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3752         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3753         return rc;
3754 }
3755
3756
3757
3758 /*
3759  * This is a no-op for now. We're not really interested in the reply, but
3760  * rather in the fact that the server sent one and that server->lstrp
3761  * gets updated.
3762  *
3763  * FIXME: maybe we should consider checking that the reply matches request?
3764  */
3765 static void
3766 smb2_echo_callback(struct mid_q_entry *mid)
3767 {
3768         struct TCP_Server_Info *server = mid->callback_data;
3769         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3770         struct cifs_credits credits = { .value = 0, .instance = 0 };
3771
3772         if (mid->mid_state == MID_RESPONSE_RECEIVED
3773             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3774                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3775                 credits.instance = server->reconnect_instance;
3776         }
3777
3778         DeleteMidQEntry(mid);
3779         add_credits(server, &credits, CIFS_ECHO_OP);
3780 }
3781
3782 void smb2_reconnect_server(struct work_struct *work)
3783 {
3784         struct TCP_Server_Info *server = container_of(work,
3785                                         struct TCP_Server_Info, reconnect.work);
3786         struct TCP_Server_Info *pserver;
3787         struct cifs_ses *ses, *ses2;
3788         struct cifs_tcon *tcon, *tcon2;
3789         struct list_head tmp_list, tmp_ses_list;
3790         bool tcon_exist = false, ses_exist = false;
3791         bool tcon_selected = false;
3792         int rc;
3793         bool resched = false;
3794
3795         /* If server is a channel, select the primary channel */
3796         pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
3797
3798         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3799         mutex_lock(&pserver->reconnect_mutex);
3800
3801         INIT_LIST_HEAD(&tmp_list);
3802         INIT_LIST_HEAD(&tmp_ses_list);
3803         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3804
3805         spin_lock(&cifs_tcp_ses_lock);
3806         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3807
3808                 tcon_selected = false;
3809
3810                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3811                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3812                                 tcon->tc_count++;
3813                                 list_add_tail(&tcon->rlist, &tmp_list);
3814                                 tcon_selected = tcon_exist = true;
3815                         }
3816                 }
3817                 /*
3818                  * IPC has the same lifetime as its session and uses its
3819                  * refcount.
3820                  */
3821                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3822                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3823                         tcon_selected = tcon_exist = true;
3824                         ses->ses_count++;
3825                 }
3826                 /*
3827                  * handle the case where channel needs to reconnect
3828                  * binding session, but tcon is healthy (some other channel
3829                  * is active)
3830                  */
3831                 spin_lock(&ses->chan_lock);
3832                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3833                         list_add_tail(&ses->rlist, &tmp_ses_list);
3834                         ses_exist = true;
3835                         ses->ses_count++;
3836                 }
3837                 spin_unlock(&ses->chan_lock);
3838         }
3839         /*
3840          * Get the reference to server struct to be sure that the last call of
3841          * cifs_put_tcon() in the loop below won't release the server pointer.
3842          */
3843         if (tcon_exist || ses_exist)
3844                 server->srv_count++;
3845
3846         spin_unlock(&cifs_tcp_ses_lock);
3847
3848         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3849                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3850                 if (!rc)
3851                         cifs_reopen_persistent_handles(tcon);
3852                 else
3853                         resched = true;
3854                 list_del_init(&tcon->rlist);
3855                 if (tcon->ipc)
3856                         cifs_put_smb_ses(tcon->ses);
3857                 else
3858                         cifs_put_tcon(tcon);
3859         }
3860
3861         if (!ses_exist)
3862                 goto done;
3863
3864         /* allocate a dummy tcon struct used for reconnect */
3865         tcon = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
3866         if (!tcon) {
3867                 resched = true;
3868                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3869                         list_del_init(&ses->rlist);
3870                         cifs_put_smb_ses(ses);
3871                 }
3872                 goto done;
3873         }
3874
3875         tcon->status = TID_GOOD;
3876         tcon->retry = false;
3877         tcon->need_reconnect = false;
3878
3879         /* now reconnect sessions for necessary channels */
3880         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3881                 tcon->ses = ses;
3882                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3883                 if (rc)
3884                         resched = true;
3885                 list_del_init(&ses->rlist);
3886                 cifs_put_smb_ses(ses);
3887         }
3888         kfree(tcon);
3889
3890 done:
3891         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
3892         if (resched)
3893                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3894         mutex_unlock(&pserver->reconnect_mutex);
3895
3896         /* now we can safely release srv struct */
3897         if (tcon_exist || ses_exist)
3898                 cifs_put_tcp_session(server, 1);
3899 }
3900
3901 int
3902 SMB2_echo(struct TCP_Server_Info *server)
3903 {
3904         struct smb2_echo_req *req;
3905         int rc = 0;
3906         struct kvec iov[1];
3907         struct smb_rqst rqst = { .rq_iov = iov,
3908                                  .rq_nvec = 1 };
3909         unsigned int total_len;
3910
3911         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
3912
3913         spin_lock(&cifs_tcp_ses_lock);
3914         if (server->ops->need_neg &&
3915             server->ops->need_neg(server)) {
3916                 spin_unlock(&cifs_tcp_ses_lock);
3917                 /* No need to send echo on newly established connections */
3918                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3919                 return rc;
3920         }
3921         spin_unlock(&cifs_tcp_ses_lock);
3922
3923         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3924                                  (void **)&req, &total_len);
3925         if (rc)
3926                 return rc;
3927
3928         req->hdr.CreditRequest = cpu_to_le16(1);
3929
3930         iov[0].iov_len = total_len;
3931         iov[0].iov_base = (char *)req;
3932
3933         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3934                              server, CIFS_ECHO_OP, NULL);
3935         if (rc)
3936                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3937
3938         cifs_small_buf_release(req);
3939         return rc;
3940 }
3941
3942 void
3943 SMB2_flush_free(struct smb_rqst *rqst)
3944 {
3945         if (rqst && rqst->rq_iov)
3946                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3947 }
3948
3949 int
3950 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3951                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3952                 u64 persistent_fid, u64 volatile_fid)
3953 {
3954         struct smb2_flush_req *req;
3955         struct kvec *iov = rqst->rq_iov;
3956         unsigned int total_len;
3957         int rc;
3958
3959         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3960                                  (void **) &req, &total_len);
3961         if (rc)
3962                 return rc;
3963
3964         req->PersistentFileId = persistent_fid;
3965         req->VolatileFileId = volatile_fid;
3966
3967         iov[0].iov_base = (char *)req;
3968         iov[0].iov_len = total_len;
3969
3970         return 0;
3971 }
3972
3973 int
3974 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3975            u64 volatile_fid)
3976 {
3977         struct cifs_ses *ses = tcon->ses;
3978         struct smb_rqst rqst;
3979         struct kvec iov[1];
3980         struct kvec rsp_iov = {NULL, 0};
3981         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3982         int resp_buftype = CIFS_NO_BUFFER;
3983         int flags = 0;
3984         int rc = 0;
3985
3986         cifs_dbg(FYI, "flush\n");
3987         if (!ses || !(ses->server))
3988                 return -EIO;
3989
3990         if (smb3_encryption_required(tcon))
3991                 flags |= CIFS_TRANSFORM_REQ;
3992
3993         memset(&rqst, 0, sizeof(struct smb_rqst));
3994         memset(&iov, 0, sizeof(iov));
3995         rqst.rq_iov = iov;
3996         rqst.rq_nvec = 1;
3997
3998         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3999                              persistent_fid, volatile_fid);
4000         if (rc)
4001                 goto flush_exit;
4002
4003         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4004         rc = cifs_send_recv(xid, ses, server,
4005                             &rqst, &resp_buftype, flags, &rsp_iov);
4006
4007         if (rc != 0) {
4008                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4009                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4010                                      rc);
4011         } else
4012                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4013                                       ses->Suid);
4014
4015  flush_exit:
4016         SMB2_flush_free(&rqst);
4017         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4018         return rc;
4019 }
4020
4021 /*
4022  * To form a chain of read requests, any read requests after the first should
4023  * have the end_of_chain boolean set to true.
4024  */
4025 static int
4026 smb2_new_read_req(void **buf, unsigned int *total_len,
4027         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4028         unsigned int remaining_bytes, int request_type)
4029 {
4030         int rc = -EACCES;
4031         struct smb2_read_req *req = NULL;
4032         struct smb2_hdr *shdr;
4033         struct TCP_Server_Info *server = io_parms->server;
4034
4035         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4036                                  (void **) &req, total_len);
4037         if (rc)
4038                 return rc;
4039
4040         if (server == NULL)
4041                 return -ECONNABORTED;
4042
4043         shdr = &req->hdr;
4044         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4045
4046         req->PersistentFileId = io_parms->persistent_fid;
4047         req->VolatileFileId = io_parms->volatile_fid;
4048         req->ReadChannelInfoOffset = 0; /* reserved */
4049         req->ReadChannelInfoLength = 0; /* reserved */
4050         req->Channel = 0; /* reserved */
4051         req->MinimumCount = 0;
4052         req->Length = cpu_to_le32(io_parms->length);
4053         req->Offset = cpu_to_le64(io_parms->offset);
4054
4055         trace_smb3_read_enter(0 /* xid */,
4056                         io_parms->persistent_fid,
4057                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4058                         io_parms->offset, io_parms->length);
4059 #ifdef CONFIG_CIFS_SMB_DIRECT
4060         /*
4061          * If we want to do a RDMA write, fill in and append
4062          * smbd_buffer_descriptor_v1 to the end of read request
4063          */
4064         if (server->rdma && rdata && !server->sign &&
4065                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
4066
4067                 struct smbd_buffer_descriptor_v1 *v1;
4068                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4069
4070                 rdata->mr = smbd_register_mr(
4071                                 server->smbd_conn, rdata->pages,
4072                                 rdata->nr_pages, rdata->page_offset,
4073                                 rdata->tailsz, true, need_invalidate);
4074                 if (!rdata->mr)
4075                         return -EAGAIN;
4076
4077                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4078                 if (need_invalidate)
4079                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4080                 req->ReadChannelInfoOffset =
4081                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4082                 req->ReadChannelInfoLength =
4083                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4084                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4085                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4086                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4087                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4088
4089                 *total_len += sizeof(*v1) - 1;
4090         }
4091 #endif
4092         if (request_type & CHAINED_REQUEST) {
4093                 if (!(request_type & END_OF_CHAIN)) {
4094                         /* next 8-byte aligned request */
4095                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
4096                         shdr->NextCommand = cpu_to_le32(*total_len);
4097                 } else /* END_OF_CHAIN */
4098                         shdr->NextCommand = 0;
4099                 if (request_type & RELATED_REQUEST) {
4100                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4101                         /*
4102                          * Related requests use info from previous read request
4103                          * in chain.
4104                          */
4105                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4106                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4107                         req->PersistentFileId = (u64)-1;
4108                         req->VolatileFileId = (u64)-1;
4109                 }
4110         }
4111         if (remaining_bytes > io_parms->length)
4112                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4113         else
4114                 req->RemainingBytes = 0;
4115
4116         *buf = req;
4117         return rc;
4118 }
4119
4120 static void
4121 smb2_readv_callback(struct mid_q_entry *mid)
4122 {
4123         struct cifs_readdata *rdata = mid->callback_data;
4124         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4125         struct TCP_Server_Info *server = rdata->server;
4126         struct smb2_hdr *shdr =
4127                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4128         struct cifs_credits credits = { .value = 0, .instance = 0 };
4129         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
4130                                  .rq_nvec = 1,
4131                                  .rq_pages = rdata->pages,
4132                                  .rq_offset = rdata->page_offset,
4133                                  .rq_npages = rdata->nr_pages,
4134                                  .rq_pagesz = rdata->pagesz,
4135                                  .rq_tailsz = rdata->tailsz };
4136
4137         WARN_ONCE(rdata->server != mid->server,
4138                   "rdata server %p != mid server %p",
4139                   rdata->server, mid->server);
4140
4141         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4142                  __func__, mid->mid, mid->mid_state, rdata->result,
4143                  rdata->bytes);
4144
4145         switch (mid->mid_state) {
4146         case MID_RESPONSE_RECEIVED:
4147                 credits.value = le16_to_cpu(shdr->CreditRequest);
4148                 credits.instance = server->reconnect_instance;
4149                 /* result already set, check signature */
4150                 if (server->sign && !mid->decrypted) {
4151                         int rc;
4152
4153                         rc = smb2_verify_signature(&rqst, server);
4154                         if (rc)
4155                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4156                                          rc);
4157                 }
4158                 /* FIXME: should this be counted toward the initiating task? */
4159                 task_io_account_read(rdata->got_bytes);
4160                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4161                 break;
4162         case MID_REQUEST_SUBMITTED:
4163         case MID_RETRY_NEEDED:
4164                 rdata->result = -EAGAIN;
4165                 if (server->sign && rdata->got_bytes)
4166                         /* reset bytes number since we can not check a sign */
4167                         rdata->got_bytes = 0;
4168                 /* FIXME: should this be counted toward the initiating task? */
4169                 task_io_account_read(rdata->got_bytes);
4170                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4171                 break;
4172         case MID_RESPONSE_MALFORMED:
4173                 credits.value = le16_to_cpu(shdr->CreditRequest);
4174                 credits.instance = server->reconnect_instance;
4175                 fallthrough;
4176         default:
4177                 rdata->result = -EIO;
4178         }
4179 #ifdef CONFIG_CIFS_SMB_DIRECT
4180         /*
4181          * If this rdata has a memmory registered, the MR can be freed
4182          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4183          * because they have limited number and are used for future I/Os
4184          */
4185         if (rdata->mr) {
4186                 smbd_deregister_mr(rdata->mr);
4187                 rdata->mr = NULL;
4188         }
4189 #endif
4190         if (rdata->result && rdata->result != -ENODATA) {
4191                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4192                 trace_smb3_read_err(0 /* xid */,
4193                                     rdata->cfile->fid.persistent_fid,
4194                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4195                                     rdata->bytes, rdata->result);
4196         } else
4197                 trace_smb3_read_done(0 /* xid */,
4198                                      rdata->cfile->fid.persistent_fid,
4199                                      tcon->tid, tcon->ses->Suid,
4200                                      rdata->offset, rdata->got_bytes);
4201
4202         queue_work(cifsiod_wq, &rdata->work);
4203         DeleteMidQEntry(mid);
4204         add_credits(server, &credits, 0);
4205 }
4206
4207 /* smb2_async_readv - send an async read, and set up mid to handle result */
4208 int
4209 smb2_async_readv(struct cifs_readdata *rdata)
4210 {
4211         int rc, flags = 0;
4212         char *buf;
4213         struct smb2_hdr *shdr;
4214         struct cifs_io_parms io_parms;
4215         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4216                                  .rq_nvec = 1 };
4217         struct TCP_Server_Info *server;
4218         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4219         unsigned int total_len;
4220
4221         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4222                  __func__, rdata->offset, rdata->bytes);
4223
4224         if (!rdata->server)
4225                 rdata->server = cifs_pick_channel(tcon->ses);
4226
4227         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4228         io_parms.server = server = rdata->server;
4229         io_parms.offset = rdata->offset;
4230         io_parms.length = rdata->bytes;
4231         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4232         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4233         io_parms.pid = rdata->pid;
4234
4235         rc = smb2_new_read_req(
4236                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4237         if (rc)
4238                 return rc;
4239
4240         if (smb3_encryption_required(io_parms.tcon))
4241                 flags |= CIFS_TRANSFORM_REQ;
4242
4243         rdata->iov[0].iov_base = buf;
4244         rdata->iov[0].iov_len = total_len;
4245
4246         shdr = (struct smb2_hdr *)buf;
4247
4248         if (rdata->credits.value > 0) {
4249                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4250                                                 SMB2_MAX_BUFFER_SIZE));
4251                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4252
4253                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4254                 if (rc)
4255                         goto async_readv_out;
4256
4257                 flags |= CIFS_HAS_CREDITS;
4258         }
4259
4260         kref_get(&rdata->refcount);
4261         rc = cifs_call_async(server, &rqst,
4262                              cifs_readv_receive, smb2_readv_callback,
4263                              smb3_handle_read_data, rdata, flags,
4264                              &rdata->credits);
4265         if (rc) {
4266                 kref_put(&rdata->refcount, cifs_readdata_release);
4267                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4268                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4269                                     io_parms.tcon->tid,
4270                                     io_parms.tcon->ses->Suid,
4271                                     io_parms.offset, io_parms.length, rc);
4272         }
4273
4274 async_readv_out:
4275         cifs_small_buf_release(buf);
4276         return rc;
4277 }
4278
4279 int
4280 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4281           unsigned int *nbytes, char **buf, int *buf_type)
4282 {
4283         struct smb_rqst rqst;
4284         int resp_buftype, rc;
4285         struct smb2_read_req *req = NULL;
4286         struct smb2_read_rsp *rsp = NULL;
4287         struct kvec iov[1];
4288         struct kvec rsp_iov;
4289         unsigned int total_len;
4290         int flags = CIFS_LOG_ERROR;
4291         struct cifs_ses *ses = io_parms->tcon->ses;
4292
4293         if (!io_parms->server)
4294                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4295
4296         *nbytes = 0;
4297         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4298         if (rc)
4299                 return rc;
4300
4301         if (smb3_encryption_required(io_parms->tcon))
4302                 flags |= CIFS_TRANSFORM_REQ;
4303
4304         iov[0].iov_base = (char *)req;
4305         iov[0].iov_len = total_len;
4306
4307         memset(&rqst, 0, sizeof(struct smb_rqst));
4308         rqst.rq_iov = iov;
4309         rqst.rq_nvec = 1;
4310
4311         rc = cifs_send_recv(xid, ses, io_parms->server,
4312                             &rqst, &resp_buftype, flags, &rsp_iov);
4313         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4314
4315         if (rc) {
4316                 if (rc != -ENODATA) {
4317                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4318                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4319                         trace_smb3_read_err(xid,
4320                                             req->PersistentFileId,
4321                                             io_parms->tcon->tid, ses->Suid,
4322                                             io_parms->offset, io_parms->length,
4323                                             rc);
4324                 } else
4325                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4326                                              ses->Suid, io_parms->offset, 0);
4327                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4328                 cifs_small_buf_release(req);
4329                 return rc == -ENODATA ? 0 : rc;
4330         } else
4331                 trace_smb3_read_done(xid,
4332                                     req->PersistentFileId,
4333                                     io_parms->tcon->tid, ses->Suid,
4334                                     io_parms->offset, io_parms->length);
4335
4336         cifs_small_buf_release(req);
4337
4338         *nbytes = le32_to_cpu(rsp->DataLength);
4339         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4340             (*nbytes > io_parms->length)) {
4341                 cifs_dbg(FYI, "bad length %d for count %d\n",
4342                          *nbytes, io_parms->length);
4343                 rc = -EIO;
4344                 *nbytes = 0;
4345         }
4346
4347         if (*buf) {
4348                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4349                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4350         } else if (resp_buftype != CIFS_NO_BUFFER) {
4351                 *buf = rsp_iov.iov_base;
4352                 if (resp_buftype == CIFS_SMALL_BUFFER)
4353                         *buf_type = CIFS_SMALL_BUFFER;
4354                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4355                         *buf_type = CIFS_LARGE_BUFFER;
4356         }
4357         return rc;
4358 }
4359
4360 /*
4361  * Check the mid_state and signature on received buffer (if any), and queue the
4362  * workqueue completion task.
4363  */
4364 static void
4365 smb2_writev_callback(struct mid_q_entry *mid)
4366 {
4367         struct cifs_writedata *wdata = mid->callback_data;
4368         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4369         struct TCP_Server_Info *server = wdata->server;
4370         unsigned int written;
4371         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4372         struct cifs_credits credits = { .value = 0, .instance = 0 };
4373
4374         WARN_ONCE(wdata->server != mid->server,
4375                   "wdata server %p != mid server %p",
4376                   wdata->server, mid->server);
4377
4378         switch (mid->mid_state) {
4379         case MID_RESPONSE_RECEIVED:
4380                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4381                 credits.instance = server->reconnect_instance;
4382                 wdata->result = smb2_check_receive(mid, server, 0);
4383                 if (wdata->result != 0)
4384                         break;
4385
4386                 written = le32_to_cpu(rsp->DataLength);
4387                 /*
4388                  * Mask off high 16 bits when bytes written as returned
4389                  * by the server is greater than bytes requested by the
4390                  * client. OS/2 servers are known to set incorrect
4391                  * CountHigh values.
4392                  */
4393                 if (written > wdata->bytes)
4394                         written &= 0xFFFF;
4395
4396                 if (written < wdata->bytes)
4397                         wdata->result = -ENOSPC;
4398                 else
4399                         wdata->bytes = written;
4400                 break;
4401         case MID_REQUEST_SUBMITTED:
4402         case MID_RETRY_NEEDED:
4403                 wdata->result = -EAGAIN;
4404                 break;
4405         case MID_RESPONSE_MALFORMED:
4406                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4407                 credits.instance = server->reconnect_instance;
4408                 fallthrough;
4409         default:
4410                 wdata->result = -EIO;
4411                 break;
4412         }
4413 #ifdef CONFIG_CIFS_SMB_DIRECT
4414         /*
4415          * If this wdata has a memory registered, the MR can be freed
4416          * The number of MRs available is limited, it's important to recover
4417          * used MR as soon as I/O is finished. Hold MR longer in the later
4418          * I/O process can possibly result in I/O deadlock due to lack of MR
4419          * to send request on I/O retry
4420          */
4421         if (wdata->mr) {
4422                 smbd_deregister_mr(wdata->mr);
4423                 wdata->mr = NULL;
4424         }
4425 #endif
4426         if (wdata->result) {
4427                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4428                 trace_smb3_write_err(0 /* no xid */,
4429                                      wdata->cfile->fid.persistent_fid,
4430                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4431                                      wdata->bytes, wdata->result);
4432                 if (wdata->result == -ENOSPC)
4433                         pr_warn_once("Out of space writing to %s\n",
4434                                      tcon->treeName);
4435         } else
4436                 trace_smb3_write_done(0 /* no xid */,
4437                                       wdata->cfile->fid.persistent_fid,
4438                                       tcon->tid, tcon->ses->Suid,
4439                                       wdata->offset, wdata->bytes);
4440
4441         queue_work(cifsiod_wq, &wdata->work);
4442         DeleteMidQEntry(mid);
4443         add_credits(server, &credits, 0);
4444 }
4445
4446 /* smb2_async_writev - send an async write, and set up mid to handle result */
4447 int
4448 smb2_async_writev(struct cifs_writedata *wdata,
4449                   void (*release)(struct kref *kref))
4450 {
4451         int rc = -EACCES, flags = 0;
4452         struct smb2_write_req *req = NULL;
4453         struct smb2_hdr *shdr;
4454         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4455         struct TCP_Server_Info *server = wdata->server;
4456         struct kvec iov[1];
4457         struct smb_rqst rqst = { };
4458         unsigned int total_len;
4459
4460         if (!wdata->server)
4461                 server = wdata->server = cifs_pick_channel(tcon->ses);
4462
4463         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4464                                  (void **) &req, &total_len);
4465         if (rc)
4466                 return rc;
4467
4468         if (smb3_encryption_required(tcon))
4469                 flags |= CIFS_TRANSFORM_REQ;
4470
4471         shdr = (struct smb2_hdr *)req;
4472         shdr->Id.SyncId.ProcessId = cpu_to_le32(wdata->cfile->pid);
4473
4474         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4475         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4476         req->WriteChannelInfoOffset = 0;
4477         req->WriteChannelInfoLength = 0;
4478         req->Channel = 0;
4479         req->Offset = cpu_to_le64(wdata->offset);
4480         req->DataOffset = cpu_to_le16(
4481                                 offsetof(struct smb2_write_req, Buffer));
4482         req->RemainingBytes = 0;
4483
4484         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4485                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4486 #ifdef CONFIG_CIFS_SMB_DIRECT
4487         /*
4488          * If we want to do a server RDMA read, fill in and append
4489          * smbd_buffer_descriptor_v1 to the end of write request
4490          */
4491         if (server->rdma && !server->sign && wdata->bytes >=
4492                 server->smbd_conn->rdma_readwrite_threshold) {
4493
4494                 struct smbd_buffer_descriptor_v1 *v1;
4495                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4496
4497                 wdata->mr = smbd_register_mr(
4498                                 server->smbd_conn, wdata->pages,
4499                                 wdata->nr_pages, wdata->page_offset,
4500                                 wdata->tailsz, false, need_invalidate);
4501                 if (!wdata->mr) {
4502                         rc = -EAGAIN;
4503                         goto async_writev_out;
4504                 }
4505                 req->Length = 0;
4506                 req->DataOffset = 0;
4507                 if (wdata->nr_pages > 1)
4508                         req->RemainingBytes =
4509                                 cpu_to_le32(
4510                                         (wdata->nr_pages - 1) * wdata->pagesz -
4511                                         wdata->page_offset + wdata->tailsz
4512                                 );
4513                 else
4514                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4515                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4516                 if (need_invalidate)
4517                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4518                 req->WriteChannelInfoOffset =
4519                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4520                 req->WriteChannelInfoLength =
4521                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4522                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4523                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4524                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4525                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4526         }
4527 #endif
4528         iov[0].iov_len = total_len - 1;
4529         iov[0].iov_base = (char *)req;
4530
4531         rqst.rq_iov = iov;
4532         rqst.rq_nvec = 1;
4533         rqst.rq_pages = wdata->pages;
4534         rqst.rq_offset = wdata->page_offset;
4535         rqst.rq_npages = wdata->nr_pages;
4536         rqst.rq_pagesz = wdata->pagesz;
4537         rqst.rq_tailsz = wdata->tailsz;
4538 #ifdef CONFIG_CIFS_SMB_DIRECT
4539         if (wdata->mr) {
4540                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4541                 rqst.rq_npages = 0;
4542         }
4543 #endif
4544         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4545                  wdata->offset, wdata->bytes);
4546
4547 #ifdef CONFIG_CIFS_SMB_DIRECT
4548         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4549         if (!wdata->mr)
4550                 req->Length = cpu_to_le32(wdata->bytes);
4551 #else
4552         req->Length = cpu_to_le32(wdata->bytes);
4553 #endif
4554
4555         if (wdata->credits.value > 0) {
4556                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4557                                                     SMB2_MAX_BUFFER_SIZE));
4558                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4559
4560                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4561                 if (rc)
4562                         goto async_writev_out;
4563
4564                 flags |= CIFS_HAS_CREDITS;
4565         }
4566
4567         kref_get(&wdata->refcount);
4568         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4569                              wdata, flags, &wdata->credits);
4570
4571         if (rc) {
4572                 trace_smb3_write_err(0 /* no xid */,
4573                                      req->PersistentFileId,
4574                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4575                                      wdata->bytes, rc);
4576                 kref_put(&wdata->refcount, release);
4577                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4578         }
4579
4580 async_writev_out:
4581         cifs_small_buf_release(req);
4582         return rc;
4583 }
4584
4585 /*
4586  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4587  * The length field from io_parms must be at least 1 and indicates a number of
4588  * elements with data to write that begins with position 1 in iov array. All
4589  * data length is specified by count.
4590  */
4591 int
4592 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4593            unsigned int *nbytes, struct kvec *iov, int n_vec)
4594 {
4595         struct smb_rqst rqst;
4596         int rc = 0;
4597         struct smb2_write_req *req = NULL;
4598         struct smb2_write_rsp *rsp = NULL;
4599         int resp_buftype;
4600         struct kvec rsp_iov;
4601         int flags = 0;
4602         unsigned int total_len;
4603         struct TCP_Server_Info *server;
4604
4605         *nbytes = 0;
4606
4607         if (n_vec < 1)
4608                 return rc;
4609
4610         if (!io_parms->server)
4611                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4612         server = io_parms->server;
4613         if (server == NULL)
4614                 return -ECONNABORTED;
4615
4616         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4617                                  (void **) &req, &total_len);
4618         if (rc)
4619                 return rc;
4620
4621         if (smb3_encryption_required(io_parms->tcon))
4622                 flags |= CIFS_TRANSFORM_REQ;
4623
4624         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4625
4626         req->PersistentFileId = io_parms->persistent_fid;
4627         req->VolatileFileId = io_parms->volatile_fid;
4628         req->WriteChannelInfoOffset = 0;
4629         req->WriteChannelInfoLength = 0;
4630         req->Channel = 0;
4631         req->Length = cpu_to_le32(io_parms->length);
4632         req->Offset = cpu_to_le64(io_parms->offset);
4633         req->DataOffset = cpu_to_le16(
4634                                 offsetof(struct smb2_write_req, Buffer));
4635         req->RemainingBytes = 0;
4636
4637         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4638                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4639                 io_parms->offset, io_parms->length);
4640
4641         iov[0].iov_base = (char *)req;
4642         /* 1 for Buffer */
4643         iov[0].iov_len = total_len - 1;
4644
4645         memset(&rqst, 0, sizeof(struct smb_rqst));
4646         rqst.rq_iov = iov;
4647         rqst.rq_nvec = n_vec + 1;
4648
4649         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4650                             &rqst,
4651                             &resp_buftype, flags, &rsp_iov);
4652         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4653
4654         if (rc) {
4655                 trace_smb3_write_err(xid,
4656                                      req->PersistentFileId,
4657                                      io_parms->tcon->tid,
4658                                      io_parms->tcon->ses->Suid,
4659                                      io_parms->offset, io_parms->length, rc);
4660                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4661                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4662         } else {
4663                 *nbytes = le32_to_cpu(rsp->DataLength);
4664                 trace_smb3_write_done(xid,
4665                                       req->PersistentFileId,
4666                                       io_parms->tcon->tid,
4667                                       io_parms->tcon->ses->Suid,
4668                                       io_parms->offset, *nbytes);
4669         }
4670
4671         cifs_small_buf_release(req);
4672         free_rsp_buf(resp_buftype, rsp);
4673         return rc;
4674 }
4675
4676 int posix_info_sid_size(const void *beg, const void *end)
4677 {
4678         size_t subauth;
4679         int total;
4680
4681         if (beg + 1 > end)
4682                 return -1;
4683
4684         subauth = *(u8 *)(beg+1);
4685         if (subauth < 1 || subauth > 15)
4686                 return -1;
4687
4688         total = 1 + 1 + 6 + 4*subauth;
4689         if (beg + total > end)
4690                 return -1;
4691
4692         return total;
4693 }
4694
4695 int posix_info_parse(const void *beg, const void *end,
4696                      struct smb2_posix_info_parsed *out)
4697
4698 {
4699         int total_len = 0;
4700         int owner_len, group_len;
4701         int name_len;
4702         const void *owner_sid;
4703         const void *group_sid;
4704         const void *name;
4705
4706         /* if no end bound given, assume payload to be correct */
4707         if (!end) {
4708                 const struct smb2_posix_info *p = beg;
4709
4710                 end = beg + le32_to_cpu(p->NextEntryOffset);
4711                 /* last element will have a 0 offset, pick a sensible bound */
4712                 if (end == beg)
4713                         end += 0xFFFF;
4714         }
4715
4716         /* check base buf */
4717         if (beg + sizeof(struct smb2_posix_info) > end)
4718                 return -1;
4719         total_len = sizeof(struct smb2_posix_info);
4720
4721         /* check owner sid */
4722         owner_sid = beg + total_len;
4723         owner_len = posix_info_sid_size(owner_sid, end);
4724         if (owner_len < 0)
4725                 return -1;
4726         total_len += owner_len;
4727
4728         /* check group sid */
4729         group_sid = beg + total_len;
4730         group_len = posix_info_sid_size(group_sid, end);
4731         if (group_len < 0)
4732                 return -1;
4733         total_len += group_len;
4734
4735         /* check name len */
4736         if (beg + total_len + 4 > end)
4737                 return -1;
4738         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4739         if (name_len < 1 || name_len > 0xFFFF)
4740                 return -1;
4741         total_len += 4;
4742
4743         /* check name */
4744         name = beg + total_len;
4745         if (name + name_len > end)
4746                 return -1;
4747         total_len += name_len;
4748
4749         if (out) {
4750                 out->base = beg;
4751                 out->size = total_len;
4752                 out->name_len = name_len;
4753                 out->name = name;
4754                 memcpy(&out->owner, owner_sid, owner_len);
4755                 memcpy(&out->group, group_sid, group_len);
4756         }
4757         return total_len;
4758 }
4759
4760 static int posix_info_extra_size(const void *beg, const void *end)
4761 {
4762         int len = posix_info_parse(beg, end, NULL);
4763
4764         if (len < 0)
4765                 return -1;
4766         return len - sizeof(struct smb2_posix_info);
4767 }
4768
4769 static unsigned int
4770 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4771             size_t size)
4772 {
4773         int len;
4774         unsigned int entrycount = 0;
4775         unsigned int next_offset = 0;
4776         char *entryptr;
4777         FILE_DIRECTORY_INFO *dir_info;
4778
4779         if (bufstart == NULL)
4780                 return 0;
4781
4782         entryptr = bufstart;
4783
4784         while (1) {
4785                 if (entryptr + next_offset < entryptr ||
4786                     entryptr + next_offset > end_of_buf ||
4787                     entryptr + next_offset + size > end_of_buf) {
4788                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4789                         break;
4790                 }
4791
4792                 entryptr = entryptr + next_offset;
4793                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4794
4795                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4796                         len = posix_info_extra_size(entryptr, end_of_buf);
4797                 else
4798                         len = le32_to_cpu(dir_info->FileNameLength);
4799
4800                 if (len < 0 ||
4801                     entryptr + len < entryptr ||
4802                     entryptr + len > end_of_buf ||
4803                     entryptr + len + size > end_of_buf) {
4804                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4805                                  end_of_buf);
4806                         break;
4807                 }
4808
4809                 *lastentry = entryptr;
4810                 entrycount++;
4811
4812                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4813                 if (!next_offset)
4814                         break;
4815         }
4816
4817         return entrycount;
4818 }
4819
4820 /*
4821  * Readdir/FindFirst
4822  */
4823 int SMB2_query_directory_init(const unsigned int xid,
4824                               struct cifs_tcon *tcon,
4825                               struct TCP_Server_Info *server,
4826                               struct smb_rqst *rqst,
4827                               u64 persistent_fid, u64 volatile_fid,
4828                               int index, int info_level)
4829 {
4830         struct smb2_query_directory_req *req;
4831         unsigned char *bufptr;
4832         __le16 asteriks = cpu_to_le16('*');
4833         unsigned int output_size = CIFSMaxBufSize -
4834                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4835                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4836         unsigned int total_len;
4837         struct kvec *iov = rqst->rq_iov;
4838         int len, rc;
4839
4840         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4841                                  (void **) &req, &total_len);
4842         if (rc)
4843                 return rc;
4844
4845         switch (info_level) {
4846         case SMB_FIND_FILE_DIRECTORY_INFO:
4847                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4848                 break;
4849         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4850                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4851                 break;
4852         case SMB_FIND_FILE_POSIX_INFO:
4853                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4854                 break;
4855         default:
4856                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4857                         info_level);
4858                 return -EINVAL;
4859         }
4860
4861         req->FileIndex = cpu_to_le32(index);
4862         req->PersistentFileId = persistent_fid;
4863         req->VolatileFileId = volatile_fid;
4864
4865         len = 0x2;
4866         bufptr = req->Buffer;
4867         memcpy(bufptr, &asteriks, len);
4868
4869         req->FileNameOffset =
4870                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4871         req->FileNameLength = cpu_to_le16(len);
4872         /*
4873          * BB could be 30 bytes or so longer if we used SMB2 specific
4874          * buffer lengths, but this is safe and close enough.
4875          */
4876         output_size = min_t(unsigned int, output_size, server->maxBuf);
4877         output_size = min_t(unsigned int, output_size, 2 << 15);
4878         req->OutputBufferLength = cpu_to_le32(output_size);
4879
4880         iov[0].iov_base = (char *)req;
4881         /* 1 for Buffer */
4882         iov[0].iov_len = total_len - 1;
4883
4884         iov[1].iov_base = (char *)(req->Buffer);
4885         iov[1].iov_len = len;
4886
4887         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4888                         tcon->ses->Suid, index, output_size);
4889
4890         return 0;
4891 }
4892
4893 void SMB2_query_directory_free(struct smb_rqst *rqst)
4894 {
4895         if (rqst && rqst->rq_iov) {
4896                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4897         }
4898 }
4899
4900 int
4901 smb2_parse_query_directory(struct cifs_tcon *tcon,
4902                            struct kvec *rsp_iov,
4903                            int resp_buftype,
4904                            struct cifs_search_info *srch_inf)
4905 {
4906         struct smb2_query_directory_rsp *rsp;
4907         size_t info_buf_size;
4908         char *end_of_smb;
4909         int rc;
4910
4911         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4912
4913         switch (srch_inf->info_level) {
4914         case SMB_FIND_FILE_DIRECTORY_INFO:
4915                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4916                 break;
4917         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4918                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4919                 break;
4920         case SMB_FIND_FILE_POSIX_INFO:
4921                 /* note that posix payload are variable size */
4922                 info_buf_size = sizeof(struct smb2_posix_info);
4923                 break;
4924         default:
4925                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4926                          srch_inf->info_level);
4927                 return -EINVAL;
4928         }
4929
4930         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4931                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4932                                info_buf_size);
4933         if (rc) {
4934                 cifs_tcon_dbg(VFS, "bad info payload");
4935                 return rc;
4936         }
4937
4938         srch_inf->unicode = true;
4939
4940         if (srch_inf->ntwrk_buf_start) {
4941                 if (srch_inf->smallBuf)
4942                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4943                 else
4944                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4945         }
4946         srch_inf->ntwrk_buf_start = (char *)rsp;
4947         srch_inf->srch_entries_start = srch_inf->last_entry =
4948                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4949         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4950
4951         srch_inf->entries_in_buffer = num_entries(
4952                 srch_inf->info_level,
4953                 srch_inf->srch_entries_start,
4954                 end_of_smb,
4955                 &srch_inf->last_entry,
4956                 info_buf_size);
4957
4958         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4959         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4960                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4961                  srch_inf->srch_entries_start, srch_inf->last_entry);
4962         if (resp_buftype == CIFS_LARGE_BUFFER)
4963                 srch_inf->smallBuf = false;
4964         else if (resp_buftype == CIFS_SMALL_BUFFER)
4965                 srch_inf->smallBuf = true;
4966         else
4967                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4968
4969         return 0;
4970 }
4971
4972 int
4973 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4974                      u64 persistent_fid, u64 volatile_fid, int index,
4975                      struct cifs_search_info *srch_inf)
4976 {
4977         struct smb_rqst rqst;
4978         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4979         struct smb2_query_directory_rsp *rsp = NULL;
4980         int resp_buftype = CIFS_NO_BUFFER;
4981         struct kvec rsp_iov;
4982         int rc = 0;
4983         struct cifs_ses *ses = tcon->ses;
4984         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4985         int flags = 0;
4986
4987         if (!ses || !(ses->server))
4988                 return -EIO;
4989
4990         if (smb3_encryption_required(tcon))
4991                 flags |= CIFS_TRANSFORM_REQ;
4992
4993         memset(&rqst, 0, sizeof(struct smb_rqst));
4994         memset(&iov, 0, sizeof(iov));
4995         rqst.rq_iov = iov;
4996         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4997
4998         rc = SMB2_query_directory_init(xid, tcon, server,
4999                                        &rqst, persistent_fid,
5000                                        volatile_fid, index,
5001                                        srch_inf->info_level);
5002         if (rc)
5003                 goto qdir_exit;
5004
5005         rc = cifs_send_recv(xid, ses, server,
5006                             &rqst, &resp_buftype, flags, &rsp_iov);
5007         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5008
5009         if (rc) {
5010                 if (rc == -ENODATA &&
5011                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5012                         trace_smb3_query_dir_done(xid, persistent_fid,
5013                                 tcon->tid, tcon->ses->Suid, index, 0);
5014                         srch_inf->endOfSearch = true;
5015                         rc = 0;
5016                 } else {
5017                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5018                                 tcon->ses->Suid, index, 0, rc);
5019                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5020                 }
5021                 goto qdir_exit;
5022         }
5023
5024         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5025                                         srch_inf);
5026         if (rc) {
5027                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5028                         tcon->ses->Suid, index, 0, rc);
5029                 goto qdir_exit;
5030         }
5031         resp_buftype = CIFS_NO_BUFFER;
5032
5033         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5034                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5035
5036 qdir_exit:
5037         SMB2_query_directory_free(&rqst);
5038         free_rsp_buf(resp_buftype, rsp);
5039         return rc;
5040 }
5041
5042 int
5043 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5044                    struct smb_rqst *rqst,
5045                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5046                    u8 info_class, u8 info_type, u32 additional_info,
5047                    void **data, unsigned int *size)
5048 {
5049         struct smb2_set_info_req *req;
5050         struct kvec *iov = rqst->rq_iov;
5051         unsigned int i, total_len;
5052         int rc;
5053
5054         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5055                                  (void **) &req, &total_len);
5056         if (rc)
5057                 return rc;
5058
5059         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5060         req->InfoType = info_type;
5061         req->FileInfoClass = info_class;
5062         req->PersistentFileId = persistent_fid;
5063         req->VolatileFileId = volatile_fid;
5064         req->AdditionalInformation = cpu_to_le32(additional_info);
5065
5066         req->BufferOffset =
5067                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
5068         req->BufferLength = cpu_to_le32(*size);
5069
5070         memcpy(req->Buffer, *data, *size);
5071         total_len += *size;
5072
5073         iov[0].iov_base = (char *)req;
5074         /* 1 for Buffer */
5075         iov[0].iov_len = total_len - 1;
5076
5077         for (i = 1; i < rqst->rq_nvec; i++) {
5078                 le32_add_cpu(&req->BufferLength, size[i]);
5079                 iov[i].iov_base = (char *)data[i];
5080                 iov[i].iov_len = size[i];
5081         }
5082
5083         return 0;
5084 }
5085
5086 void
5087 SMB2_set_info_free(struct smb_rqst *rqst)
5088 {
5089         if (rqst && rqst->rq_iov)
5090                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5091 }
5092
5093 static int
5094 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5095                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5096                u8 info_type, u32 additional_info, unsigned int num,
5097                 void **data, unsigned int *size)
5098 {
5099         struct smb_rqst rqst;
5100         struct smb2_set_info_rsp *rsp = NULL;
5101         struct kvec *iov;
5102         struct kvec rsp_iov;
5103         int rc = 0;
5104         int resp_buftype;
5105         struct cifs_ses *ses = tcon->ses;
5106         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5107         int flags = 0;
5108
5109         if (!ses || !server)
5110                 return -EIO;
5111
5112         if (!num)
5113                 return -EINVAL;
5114
5115         if (smb3_encryption_required(tcon))
5116                 flags |= CIFS_TRANSFORM_REQ;
5117
5118         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5119         if (!iov)
5120                 return -ENOMEM;
5121
5122         memset(&rqst, 0, sizeof(struct smb_rqst));
5123         rqst.rq_iov = iov;
5124         rqst.rq_nvec = num;
5125
5126         rc = SMB2_set_info_init(tcon, server,
5127                                 &rqst, persistent_fid, volatile_fid, pid,
5128                                 info_class, info_type, additional_info,
5129                                 data, size);
5130         if (rc) {
5131                 kfree(iov);
5132                 return rc;
5133         }
5134
5135
5136         rc = cifs_send_recv(xid, ses, server,
5137                             &rqst, &resp_buftype, flags,
5138                             &rsp_iov);
5139         SMB2_set_info_free(&rqst);
5140         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5141
5142         if (rc != 0) {
5143                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5144                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5145                                 ses->Suid, info_class, (__u32)info_type, rc);
5146         }
5147
5148         free_rsp_buf(resp_buftype, rsp);
5149         kfree(iov);
5150         return rc;
5151 }
5152
5153 int
5154 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5155              u64 volatile_fid, u32 pid, __le64 *eof)
5156 {
5157         struct smb2_file_eof_info info;
5158         void *data;
5159         unsigned int size;
5160
5161         info.EndOfFile = *eof;
5162
5163         data = &info;
5164         size = sizeof(struct smb2_file_eof_info);
5165
5166         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5167
5168         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5169                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5170                         0, 1, &data, &size);
5171 }
5172
5173 int
5174 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5175                 u64 persistent_fid, u64 volatile_fid,
5176                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5177 {
5178         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5179                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5180                         1, (void **)&pnntsd, &pacllen);
5181 }
5182
5183 int
5184 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5185             u64 persistent_fid, u64 volatile_fid,
5186             struct smb2_file_full_ea_info *buf, int len)
5187 {
5188         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5189                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5190                 0, 1, (void **)&buf, &len);
5191 }
5192
5193 int
5194 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5195                   const u64 persistent_fid, const u64 volatile_fid,
5196                   __u8 oplock_level)
5197 {
5198         struct smb_rqst rqst;
5199         int rc;
5200         struct smb2_oplock_break *req = NULL;
5201         struct cifs_ses *ses = tcon->ses;
5202         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5203         int flags = CIFS_OBREAK_OP;
5204         unsigned int total_len;
5205         struct kvec iov[1];
5206         struct kvec rsp_iov;
5207         int resp_buf_type;
5208
5209         cifs_dbg(FYI, "SMB2_oplock_break\n");
5210         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5211                                  (void **) &req, &total_len);
5212         if (rc)
5213                 return rc;
5214
5215         if (smb3_encryption_required(tcon))
5216                 flags |= CIFS_TRANSFORM_REQ;
5217
5218         req->VolatileFid = volatile_fid;
5219         req->PersistentFid = persistent_fid;
5220         req->OplockLevel = oplock_level;
5221         req->hdr.CreditRequest = cpu_to_le16(1);
5222
5223         flags |= CIFS_NO_RSP_BUF;
5224
5225         iov[0].iov_base = (char *)req;
5226         iov[0].iov_len = total_len;
5227
5228         memset(&rqst, 0, sizeof(struct smb_rqst));
5229         rqst.rq_iov = iov;
5230         rqst.rq_nvec = 1;
5231
5232         rc = cifs_send_recv(xid, ses, server,
5233                             &rqst, &resp_buf_type, flags, &rsp_iov);
5234         cifs_small_buf_release(req);
5235
5236         if (rc) {
5237                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5238                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5239         }
5240
5241         return rc;
5242 }
5243
5244 void
5245 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5246                              struct kstatfs *kst)
5247 {
5248         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5249                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5250         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5251         kst->f_bfree  = kst->f_bavail =
5252                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5253         return;
5254 }
5255
5256 static void
5257 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5258                         struct kstatfs *kst)
5259 {
5260         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5261         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5262         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5263         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5264                 kst->f_bavail = kst->f_bfree;
5265         else
5266                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5267         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5268                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5269         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5270                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5271
5272         return;
5273 }
5274
5275 static int
5276 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5277                    struct TCP_Server_Info *server,
5278                    int level, int outbuf_len, u64 persistent_fid,
5279                    u64 volatile_fid)
5280 {
5281         int rc;
5282         struct smb2_query_info_req *req;
5283         unsigned int total_len;
5284
5285         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5286
5287         if ((tcon->ses == NULL) || server == NULL)
5288                 return -EIO;
5289
5290         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5291                                  (void **) &req, &total_len);
5292         if (rc)
5293                 return rc;
5294
5295         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5296         req->FileInfoClass = level;
5297         req->PersistentFileId = persistent_fid;
5298         req->VolatileFileId = volatile_fid;
5299         /* 1 for pad */
5300         req->InputBufferOffset =
5301                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5302         req->OutputBufferLength = cpu_to_le32(
5303                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5304
5305         iov->iov_base = (char *)req;
5306         iov->iov_len = total_len;
5307         return 0;
5308 }
5309
5310 int
5311 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5312               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5313 {
5314         struct smb_rqst rqst;
5315         struct smb2_query_info_rsp *rsp = NULL;
5316         struct kvec iov;
5317         struct kvec rsp_iov;
5318         int rc = 0;
5319         int resp_buftype;
5320         struct cifs_ses *ses = tcon->ses;
5321         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5322         FILE_SYSTEM_POSIX_INFO *info = NULL;
5323         int flags = 0;
5324
5325         rc = build_qfs_info_req(&iov, tcon, server,
5326                                 FS_POSIX_INFORMATION,
5327                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5328                                 persistent_fid, volatile_fid);
5329         if (rc)
5330                 return rc;
5331
5332         if (smb3_encryption_required(tcon))
5333                 flags |= CIFS_TRANSFORM_REQ;
5334
5335         memset(&rqst, 0, sizeof(struct smb_rqst));
5336         rqst.rq_iov = &iov;
5337         rqst.rq_nvec = 1;
5338
5339         rc = cifs_send_recv(xid, ses, server,
5340                             &rqst, &resp_buftype, flags, &rsp_iov);
5341         cifs_small_buf_release(iov.iov_base);
5342         if (rc) {
5343                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5344                 goto posix_qfsinf_exit;
5345         }
5346         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5347
5348         info = (FILE_SYSTEM_POSIX_INFO *)(
5349                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5350         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5351                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5352                                sizeof(FILE_SYSTEM_POSIX_INFO));
5353         if (!rc)
5354                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5355
5356 posix_qfsinf_exit:
5357         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5358         return rc;
5359 }
5360
5361 int
5362 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5363               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5364 {
5365         struct smb_rqst rqst;
5366         struct smb2_query_info_rsp *rsp = NULL;
5367         struct kvec iov;
5368         struct kvec rsp_iov;
5369         int rc = 0;
5370         int resp_buftype;
5371         struct cifs_ses *ses = tcon->ses;
5372         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5373         struct smb2_fs_full_size_info *info = NULL;
5374         int flags = 0;
5375
5376         rc = build_qfs_info_req(&iov, tcon, server,
5377                                 FS_FULL_SIZE_INFORMATION,
5378                                 sizeof(struct smb2_fs_full_size_info),
5379                                 persistent_fid, volatile_fid);
5380         if (rc)
5381                 return rc;
5382
5383         if (smb3_encryption_required(tcon))
5384                 flags |= CIFS_TRANSFORM_REQ;
5385
5386         memset(&rqst, 0, sizeof(struct smb_rqst));
5387         rqst.rq_iov = &iov;
5388         rqst.rq_nvec = 1;
5389
5390         rc = cifs_send_recv(xid, ses, server,
5391                             &rqst, &resp_buftype, flags, &rsp_iov);
5392         cifs_small_buf_release(iov.iov_base);
5393         if (rc) {
5394                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5395                 goto qfsinf_exit;
5396         }
5397         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5398
5399         info = (struct smb2_fs_full_size_info *)(
5400                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5401         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5402                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5403                                sizeof(struct smb2_fs_full_size_info));
5404         if (!rc)
5405                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5406
5407 qfsinf_exit:
5408         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5409         return rc;
5410 }
5411
5412 int
5413 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5414               u64 persistent_fid, u64 volatile_fid, int level)
5415 {
5416         struct smb_rqst rqst;
5417         struct smb2_query_info_rsp *rsp = NULL;
5418         struct kvec iov;
5419         struct kvec rsp_iov;
5420         int rc = 0;
5421         int resp_buftype, max_len, min_len;
5422         struct cifs_ses *ses = tcon->ses;
5423         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5424         unsigned int rsp_len, offset;
5425         int flags = 0;
5426
5427         if (level == FS_DEVICE_INFORMATION) {
5428                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5429                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5430         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5431                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5432                 min_len = MIN_FS_ATTR_INFO_SIZE;
5433         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5434                 max_len = sizeof(struct smb3_fs_ss_info);
5435                 min_len = sizeof(struct smb3_fs_ss_info);
5436         } else if (level == FS_VOLUME_INFORMATION) {
5437                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5438                 min_len = sizeof(struct smb3_fs_vol_info);
5439         } else {
5440                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5441                 return -EINVAL;
5442         }
5443
5444         rc = build_qfs_info_req(&iov, tcon, server,
5445                                 level, max_len,
5446                                 persistent_fid, volatile_fid);
5447         if (rc)
5448                 return rc;
5449
5450         if (smb3_encryption_required(tcon))
5451                 flags |= CIFS_TRANSFORM_REQ;
5452
5453         memset(&rqst, 0, sizeof(struct smb_rqst));
5454         rqst.rq_iov = &iov;
5455         rqst.rq_nvec = 1;
5456
5457         rc = cifs_send_recv(xid, ses, server,
5458                             &rqst, &resp_buftype, flags, &rsp_iov);
5459         cifs_small_buf_release(iov.iov_base);
5460         if (rc) {
5461                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5462                 goto qfsattr_exit;
5463         }
5464         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5465
5466         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5467         offset = le16_to_cpu(rsp->OutputBufferOffset);
5468         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5469         if (rc)
5470                 goto qfsattr_exit;
5471
5472         if (level == FS_ATTRIBUTE_INFORMATION)
5473                 memcpy(&tcon->fsAttrInfo, offset
5474                         + (char *)rsp, min_t(unsigned int,
5475                         rsp_len, max_len));
5476         else if (level == FS_DEVICE_INFORMATION)
5477                 memcpy(&tcon->fsDevInfo, offset
5478                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5479         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5480                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5481                         (offset + (char *)rsp);
5482                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5483                 tcon->perf_sector_size =
5484                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5485         } else if (level == FS_VOLUME_INFORMATION) {
5486                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5487                         (offset + (char *)rsp);
5488                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5489                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5490         }
5491
5492 qfsattr_exit:
5493         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5494         return rc;
5495 }
5496
5497 int
5498 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5499            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5500            const __u32 num_lock, struct smb2_lock_element *buf)
5501 {
5502         struct smb_rqst rqst;
5503         int rc = 0;
5504         struct smb2_lock_req *req = NULL;
5505         struct kvec iov[2];
5506         struct kvec rsp_iov;
5507         int resp_buf_type;
5508         unsigned int count;
5509         int flags = CIFS_NO_RSP_BUF;
5510         unsigned int total_len;
5511         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5512
5513         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5514
5515         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5516                                  (void **) &req, &total_len);
5517         if (rc)
5518                 return rc;
5519
5520         if (smb3_encryption_required(tcon))
5521                 flags |= CIFS_TRANSFORM_REQ;
5522
5523         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5524         req->LockCount = cpu_to_le16(num_lock);
5525
5526         req->PersistentFileId = persist_fid;
5527         req->VolatileFileId = volatile_fid;
5528
5529         count = num_lock * sizeof(struct smb2_lock_element);
5530
5531         iov[0].iov_base = (char *)req;
5532         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5533         iov[1].iov_base = (char *)buf;
5534         iov[1].iov_len = count;
5535
5536         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5537
5538         memset(&rqst, 0, sizeof(struct smb_rqst));
5539         rqst.rq_iov = iov;
5540         rqst.rq_nvec = 2;
5541
5542         rc = cifs_send_recv(xid, tcon->ses, server,
5543                             &rqst, &resp_buf_type, flags,
5544                             &rsp_iov);
5545         cifs_small_buf_release(req);
5546         if (rc) {
5547                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5548                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5549                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5550                                     tcon->ses->Suid, rc);
5551         }
5552
5553         return rc;
5554 }
5555
5556 int
5557 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5558           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5559           const __u64 length, const __u64 offset, const __u32 lock_flags,
5560           const bool wait)
5561 {
5562         struct smb2_lock_element lock;
5563
5564         lock.Offset = cpu_to_le64(offset);
5565         lock.Length = cpu_to_le64(length);
5566         lock.Flags = cpu_to_le32(lock_flags);
5567         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5568                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5569
5570         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5571 }
5572
5573 int
5574 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5575                  __u8 *lease_key, const __le32 lease_state)
5576 {
5577         struct smb_rqst rqst;
5578         int rc;
5579         struct smb2_lease_ack *req = NULL;
5580         struct cifs_ses *ses = tcon->ses;
5581         int flags = CIFS_OBREAK_OP;
5582         unsigned int total_len;
5583         struct kvec iov[1];
5584         struct kvec rsp_iov;
5585         int resp_buf_type;
5586         __u64 *please_key_high;
5587         __u64 *please_key_low;
5588         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5589
5590         cifs_dbg(FYI, "SMB2_lease_break\n");
5591         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5592                                  (void **) &req, &total_len);
5593         if (rc)
5594                 return rc;
5595
5596         if (smb3_encryption_required(tcon))
5597                 flags |= CIFS_TRANSFORM_REQ;
5598
5599         req->hdr.CreditRequest = cpu_to_le16(1);
5600         req->StructureSize = cpu_to_le16(36);
5601         total_len += 12;
5602
5603         memcpy(req->LeaseKey, lease_key, 16);
5604         req->LeaseState = lease_state;
5605
5606         flags |= CIFS_NO_RSP_BUF;
5607
5608         iov[0].iov_base = (char *)req;
5609         iov[0].iov_len = total_len;
5610
5611         memset(&rqst, 0, sizeof(struct smb_rqst));
5612         rqst.rq_iov = iov;
5613         rqst.rq_nvec = 1;
5614
5615         rc = cifs_send_recv(xid, ses, server,
5616                             &rqst, &resp_buf_type, flags, &rsp_iov);
5617         cifs_small_buf_release(req);
5618
5619         please_key_low = (__u64 *)lease_key;
5620         please_key_high = (__u64 *)(lease_key+8);
5621         if (rc) {
5622                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5623                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5624                         ses->Suid, *please_key_low, *please_key_high, rc);
5625                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5626         } else
5627                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5628                         ses->Suid, *please_key_low, *please_key_high);
5629
5630         return rc;
5631 }