fs/cifs/smb2pdu.c

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