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 out:
1485         sess_data->result = rc;
1486         sess_data->func = NULL;
1487         SMB2_sess_free_buffer(sess_data);
1488 }
1489 #else
1490 static void
1491 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1492 {
1493         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1494         sess_data->result = -EOPNOTSUPP;
1495         sess_data->func = NULL;
1496 }
1497 #endif
1498
1499 static void
1500 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1501
1502 static void
1503 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1504 {
1505         int rc;
1506         struct cifs_ses *ses = sess_data->ses;
1507         struct TCP_Server_Info *server = sess_data->server;
1508         struct smb2_sess_setup_rsp *rsp = NULL;
1509         unsigned char *ntlmssp_blob = NULL;
1510         bool use_spnego = false; /* else use raw ntlmssp */
1511         u16 blob_length = 0;
1512         bool is_binding = false;
1513
1514         /*
1515          * If memory allocation is successful, caller of this function
1516          * frees it.
1517          */
1518         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1519         if (!ses->ntlmssp) {
1520                 rc = -ENOMEM;
1521                 goto out_err;
1522         }
1523         ses->ntlmssp->sesskey_per_smbsess = true;
1524
1525         rc = SMB2_sess_alloc_buffer(sess_data);
1526         if (rc)
1527                 goto out_err;
1528
1529         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1530                                           &blob_length, ses, server,
1531                                           sess_data->nls_cp);
1532         if (rc)
1533                 goto out;
1534
1535         if (use_spnego) {
1536                 /* BB eventually need to add this */
1537                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1538                 rc = -EOPNOTSUPP;
1539                 goto out;
1540         }
1541         sess_data->iov[1].iov_base = ntlmssp_blob;
1542         sess_data->iov[1].iov_len = blob_length;
1543
1544         rc = SMB2_sess_sendreceive(sess_data);
1545         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1546
1547         /* If true, rc here is expected and not an error */
1548         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1549                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1550                 rc = 0;
1551
1552         if (rc)
1553                 goto out;
1554
1555         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1556                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1557                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1558                         le16_to_cpu(rsp->SecurityBufferOffset));
1559                 rc = -EIO;
1560                 goto out;
1561         }
1562         rc = decode_ntlmssp_challenge(rsp->Buffer,
1563                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1564         if (rc)
1565                 goto out;
1566
1567         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1568
1569         spin_lock(&ses->chan_lock);
1570         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1571         spin_unlock(&ses->chan_lock);
1572
1573         /* keep existing ses id and flags if binding */
1574         if (!is_binding) {
1575                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1576                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1577         }
1578
1579 out:
1580         kfree_sensitive(ntlmssp_blob);
1581         SMB2_sess_free_buffer(sess_data);
1582         if (!rc) {
1583                 sess_data->result = 0;
1584                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1585                 return;
1586         }
1587 out_err:
1588         kfree_sensitive(ses->ntlmssp);
1589         ses->ntlmssp = NULL;
1590         sess_data->result = rc;
1591         sess_data->func = NULL;
1592 }
1593
1594 static void
1595 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1596 {
1597         int rc;
1598         struct cifs_ses *ses = sess_data->ses;
1599         struct TCP_Server_Info *server = sess_data->server;
1600         struct smb2_sess_setup_req *req;
1601         struct smb2_sess_setup_rsp *rsp = NULL;
1602         unsigned char *ntlmssp_blob = NULL;
1603         bool use_spnego = false; /* else use raw ntlmssp */
1604         u16 blob_length = 0;
1605         bool is_binding = false;
1606
1607         rc = SMB2_sess_alloc_buffer(sess_data);
1608         if (rc)
1609                 goto out;
1610
1611         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1612         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1613
1614         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1615                                      ses, server,
1616                                      sess_data->nls_cp);
1617         if (rc) {
1618                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1619                 goto out;
1620         }
1621
1622         if (use_spnego) {
1623                 /* BB eventually need to add this */
1624                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1625                 rc = -EOPNOTSUPP;
1626                 goto out;
1627         }
1628         sess_data->iov[1].iov_base = ntlmssp_blob;
1629         sess_data->iov[1].iov_len = blob_length;
1630
1631         rc = SMB2_sess_sendreceive(sess_data);
1632         if (rc)
1633                 goto out;
1634
1635         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1636
1637         spin_lock(&ses->chan_lock);
1638         is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1639         spin_unlock(&ses->chan_lock);
1640
1641         /* keep existing ses id and flags if binding */
1642         if (!is_binding) {
1643                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1644                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1645         }
1646
1647         rc = SMB2_sess_establish_session(sess_data);
1648 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1649         if (ses->server->dialect < SMB30_PROT_ID) {
1650                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1651                 /*
1652                  * The session id is opaque in terms of endianness, so we can't
1653                  * print it as a long long. we dump it as we got it on the wire
1654                  */
1655                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1656                          &ses->Suid);
1657                 cifs_dbg(VFS, "Session Key   %*ph\n",
1658                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1659                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1660                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1661         }
1662 #endif
1663 out:
1664         kfree_sensitive(ntlmssp_blob);
1665         SMB2_sess_free_buffer(sess_data);
1666         kfree_sensitive(ses->ntlmssp);
1667         ses->ntlmssp = NULL;
1668         sess_data->result = rc;
1669         sess_data->func = NULL;
1670 }
1671
1672 static int
1673 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1674 {
1675         int type;
1676         struct cifs_ses *ses = sess_data->ses;
1677         struct TCP_Server_Info *server = sess_data->server;
1678
1679         type = smb2_select_sectype(server, ses->sectype);
1680         cifs_dbg(FYI, "sess setup type %d\n", type);
1681         if (type == Unspecified) {
1682                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1683                 return -EINVAL;
1684         }
1685
1686         switch (type) {
1687         case Kerberos:
1688                 sess_data->func = SMB2_auth_kerberos;
1689                 break;
1690         case RawNTLMSSP:
1691                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1692                 break;
1693         default:
1694                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1695                 return -EOPNOTSUPP;
1696         }
1697
1698         return 0;
1699 }
1700
1701 int
1702 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1703                 struct TCP_Server_Info *server,
1704                 const struct nls_table *nls_cp)
1705 {
1706         int rc = 0;
1707         struct SMB2_sess_data *sess_data;
1708
1709         cifs_dbg(FYI, "Session Setup\n");
1710
1711         if (!server) {
1712                 WARN(1, "%s: server is NULL!\n", __func__);
1713                 return -EIO;
1714         }
1715
1716         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1717         if (!sess_data)
1718                 return -ENOMEM;
1719
1720         sess_data->xid = xid;
1721         sess_data->ses = ses;
1722         sess_data->server = server;
1723         sess_data->buf0_type = CIFS_NO_BUFFER;
1724         sess_data->nls_cp = (struct nls_table *) nls_cp;
1725         sess_data->previous_session = ses->Suid;
1726
1727         rc = SMB2_select_sec(sess_data);
1728         if (rc)
1729                 goto out;
1730
1731         /*
1732          * Initialize the session hash with the server one.
1733          */
1734         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1735                SMB2_PREAUTH_HASH_SIZE);
1736
1737         while (sess_data->func)
1738                 sess_data->func(sess_data);
1739
1740         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1741                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1742         rc = sess_data->result;
1743 out:
1744         kfree_sensitive(sess_data);
1745         return rc;
1746 }
1747
1748 int
1749 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1750 {
1751         struct smb_rqst rqst;
1752         struct smb2_logoff_req *req; /* response is also trivial struct */
1753         int rc = 0;
1754         struct TCP_Server_Info *server;
1755         int flags = 0;
1756         unsigned int total_len;
1757         struct kvec iov[1];
1758         struct kvec rsp_iov;
1759         int resp_buf_type;
1760
1761         cifs_dbg(FYI, "disconnect session %p\n", ses);
1762
1763         if (ses && (ses->server))
1764                 server = ses->server;
1765         else
1766                 return -EIO;
1767
1768         /* no need to send SMB logoff if uid already closed due to reconnect */
1769         spin_lock(&ses->chan_lock);
1770         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1771                 spin_unlock(&ses->chan_lock);
1772                 goto smb2_session_already_dead;
1773         }
1774         spin_unlock(&ses->chan_lock);
1775
1776         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1777                                  (void **) &req, &total_len);
1778         if (rc)
1779                 return rc;
1780
1781          /* since no tcon, smb2_init can not do this, so do here */
1782         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1783
1784         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1785                 flags |= CIFS_TRANSFORM_REQ;
1786         else if (server->sign)
1787                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1788
1789         flags |= CIFS_NO_RSP_BUF;
1790
1791         iov[0].iov_base = (char *)req;
1792         iov[0].iov_len = total_len;
1793
1794         memset(&rqst, 0, sizeof(struct smb_rqst));
1795         rqst.rq_iov = iov;
1796         rqst.rq_nvec = 1;
1797
1798         rc = cifs_send_recv(xid, ses, ses->server,
1799                             &rqst, &resp_buf_type, flags, &rsp_iov);
1800         cifs_small_buf_release(req);
1801         /*
1802          * No tcon so can't do
1803          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1804          */
1805
1806 smb2_session_already_dead:
1807         return rc;
1808 }
1809
1810 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1811 {
1812         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1813 }
1814
1815 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1816
1817 /* These are similar values to what Windows uses */
1818 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1819 {
1820         tcon->max_chunks = 256;
1821         tcon->max_bytes_chunk = 1048576;
1822         tcon->max_bytes_copy = 16777216;
1823 }
1824
1825 int
1826 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1827           struct cifs_tcon *tcon, const struct nls_table *cp)
1828 {
1829         struct smb_rqst rqst;
1830         struct smb2_tree_connect_req *req;
1831         struct smb2_tree_connect_rsp *rsp = NULL;
1832         struct kvec iov[2];
1833         struct kvec rsp_iov = { NULL, 0 };
1834         int rc = 0;
1835         int resp_buftype;
1836         int unc_path_len;
1837         __le16 *unc_path = NULL;
1838         int flags = 0;
1839         unsigned int total_len;
1840         struct TCP_Server_Info *server;
1841
1842         /* always use master channel */
1843         server = ses->server;
1844
1845         cifs_dbg(FYI, "TCON\n");
1846
1847         if (!server || !tree)
1848                 return -EIO;
1849
1850         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1851         if (unc_path == NULL)
1852                 return -ENOMEM;
1853
1854         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1855         unc_path_len *= 2;
1856         if (unc_path_len < 2) {
1857                 kfree(unc_path);
1858                 return -EINVAL;
1859         }
1860
1861         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1862         tcon->tid = 0;
1863         atomic_set(&tcon->num_remote_opens, 0);
1864         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1865                                  (void **) &req, &total_len);
1866         if (rc) {
1867                 kfree(unc_path);
1868                 return rc;
1869         }
1870
1871         if (smb3_encryption_required(tcon))
1872                 flags |= CIFS_TRANSFORM_REQ;
1873
1874         iov[0].iov_base = (char *)req;
1875         /* 1 for pad */
1876         iov[0].iov_len = total_len - 1;
1877
1878         /* Testing shows that buffer offset must be at location of Buffer[0] */
1879         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1880                         - 1 /* pad */);
1881         req->PathLength = cpu_to_le16(unc_path_len - 2);
1882         iov[1].iov_base = unc_path;
1883         iov[1].iov_len = unc_path_len;
1884
1885         /*
1886          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1887          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1888          * (Samba servers don't always set the flag so also check if null user)
1889          */
1890         if ((server->dialect == SMB311_PROT_ID) &&
1891             !smb3_encryption_required(tcon) &&
1892             !(ses->session_flags &
1893                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1894             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1895                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1896
1897         memset(&rqst, 0, sizeof(struct smb_rqst));
1898         rqst.rq_iov = iov;
1899         rqst.rq_nvec = 2;
1900
1901         /* Need 64 for max size write so ask for more in case not there yet */
1902         req->hdr.CreditRequest = cpu_to_le16(64);
1903
1904         rc = cifs_send_recv(xid, ses, server,
1905                             &rqst, &resp_buftype, flags, &rsp_iov);
1906         cifs_small_buf_release(req);
1907         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1908         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1909         if ((rc != 0) || (rsp == NULL)) {
1910                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1911                 tcon->need_reconnect = true;
1912                 goto tcon_error_exit;
1913         }
1914
1915         switch (rsp->ShareType) {
1916         case SMB2_SHARE_TYPE_DISK:
1917                 cifs_dbg(FYI, "connection to disk share\n");
1918                 break;
1919         case SMB2_SHARE_TYPE_PIPE:
1920                 tcon->pipe = true;
1921                 cifs_dbg(FYI, "connection to pipe share\n");
1922                 break;
1923         case SMB2_SHARE_TYPE_PRINT:
1924                 tcon->print = true;
1925                 cifs_dbg(FYI, "connection to printer\n");
1926                 break;
1927         default:
1928                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1929                 rc = -EOPNOTSUPP;
1930                 goto tcon_error_exit;
1931         }
1932
1933         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1934         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1935         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1936         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
1937         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
1938
1939         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1940             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1941                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1942
1943         if (tcon->seal &&
1944             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1945                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1946
1947         init_copy_chunk_defaults(tcon);
1948         if (server->ops->validate_negotiate)
1949                 rc = server->ops->validate_negotiate(xid, tcon);
1950 tcon_exit:
1951
1952         free_rsp_buf(resp_buftype, rsp);
1953         kfree(unc_path);
1954         return rc;
1955
1956 tcon_error_exit:
1957         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
1958                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1959         goto tcon_exit;
1960 }
1961
1962 int
1963 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1964 {
1965         struct smb_rqst rqst;
1966         struct smb2_tree_disconnect_req *req; /* response is trivial */
1967         int rc = 0;
1968         struct cifs_ses *ses = tcon->ses;
1969         int flags = 0;
1970         unsigned int total_len;
1971         struct kvec iov[1];
1972         struct kvec rsp_iov;
1973         int resp_buf_type;
1974
1975         cifs_dbg(FYI, "Tree Disconnect\n");
1976
1977         if (!ses || !(ses->server))
1978                 return -EIO;
1979
1980         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
1981         spin_lock(&ses->chan_lock);
1982         if ((tcon->need_reconnect) ||
1983             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
1984                 spin_unlock(&ses->chan_lock);
1985                 return 0;
1986         }
1987         spin_unlock(&ses->chan_lock);
1988
1989         invalidate_all_cached_dirs(tcon);
1990
1991         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1992                                  (void **) &req,
1993                                  &total_len);
1994         if (rc)
1995                 return rc;
1996
1997         if (smb3_encryption_required(tcon))
1998                 flags |= CIFS_TRANSFORM_REQ;
1999
2000         flags |= CIFS_NO_RSP_BUF;
2001
2002         iov[0].iov_base = (char *)req;
2003         iov[0].iov_len = total_len;
2004
2005         memset(&rqst, 0, sizeof(struct smb_rqst));
2006         rqst.rq_iov = iov;
2007         rqst.rq_nvec = 1;
2008
2009         rc = cifs_send_recv(xid, ses, ses->server,
2010                             &rqst, &resp_buf_type, flags, &rsp_iov);
2011         cifs_small_buf_release(req);
2012         if (rc) {
2013                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2014                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2015         }
2016         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2017
2018         return rc;
2019 }
2020
2021
2022 static struct create_durable *
2023 create_durable_buf(void)
2024 {
2025         struct create_durable *buf;
2026
2027         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2028         if (!buf)
2029                 return NULL;
2030
2031         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2032                                         (struct create_durable, Data));
2033         buf->ccontext.DataLength = cpu_to_le32(16);
2034         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2035                                 (struct create_durable, Name));
2036         buf->ccontext.NameLength = cpu_to_le16(4);
2037         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2038         buf->Name[0] = 'D';
2039         buf->Name[1] = 'H';
2040         buf->Name[2] = 'n';
2041         buf->Name[3] = 'Q';
2042         return buf;
2043 }
2044
2045 static struct create_durable *
2046 create_reconnect_durable_buf(struct cifs_fid *fid)
2047 {
2048         struct create_durable *buf;
2049
2050         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2051         if (!buf)
2052                 return NULL;
2053
2054         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2055                                         (struct create_durable, Data));
2056         buf->ccontext.DataLength = cpu_to_le32(16);
2057         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2058                                 (struct create_durable, Name));
2059         buf->ccontext.NameLength = cpu_to_le16(4);
2060         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2061         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2062         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2063         buf->Name[0] = 'D';
2064         buf->Name[1] = 'H';
2065         buf->Name[2] = 'n';
2066         buf->Name[3] = 'C';
2067         return buf;
2068 }
2069
2070 static void
2071 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2072 {
2073         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2074
2075         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2076                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2077         buf->IndexNumber = pdisk_id->DiskFileId;
2078 }
2079
2080 static void
2081 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2082                  struct create_posix_rsp *posix)
2083 {
2084         int sid_len;
2085         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2086         u8 *end = beg + le32_to_cpu(cc->DataLength);
2087         u8 *sid;
2088
2089         memset(posix, 0, sizeof(*posix));
2090
2091         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2092         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2093         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2094
2095         sid = beg + 12;
2096         sid_len = posix_info_sid_size(sid, end);
2097         if (sid_len < 0) {
2098                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2099                 return;
2100         }
2101         memcpy(&posix->owner, sid, sid_len);
2102
2103         sid = sid + sid_len;
2104         sid_len = posix_info_sid_size(sid, end);
2105         if (sid_len < 0) {
2106                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2107                 return;
2108         }
2109         memcpy(&posix->group, sid, sid_len);
2110
2111         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2112                  posix->nlink, posix->mode, posix->reparse_tag);
2113 }
2114
2115 void
2116 smb2_parse_contexts(struct TCP_Server_Info *server,
2117                     struct smb2_create_rsp *rsp,
2118                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2119                     struct smb2_file_all_info *buf,
2120                     struct create_posix_rsp *posix)
2121 {
2122         char *data_offset;
2123         struct create_context *cc;
2124         unsigned int next;
2125         unsigned int remaining;
2126         char *name;
2127         static const char smb3_create_tag_posix[] = {
2128                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2129                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2130                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2131         };
2132
2133         *oplock = 0;
2134         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2135         remaining = le32_to_cpu(rsp->CreateContextsLength);
2136         cc = (struct create_context *)data_offset;
2137
2138         /* Initialize inode number to 0 in case no valid data in qfid context */
2139         if (buf)
2140                 buf->IndexNumber = 0;
2141
2142         while (remaining >= sizeof(struct create_context)) {
2143                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2144                 if (le16_to_cpu(cc->NameLength) == 4 &&
2145                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2146                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2147                                                            lease_key);
2148                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2149                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2150                         parse_query_id_ctxt(cc, buf);
2151                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2152                         if (posix &&
2153                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2154                                 parse_posix_ctxt(cc, buf, posix);
2155                 }
2156                 /* else {
2157                         cifs_dbg(FYI, "Context not matched with len %d\n",
2158                                 le16_to_cpu(cc->NameLength));
2159                         cifs_dump_mem("Cctxt name: ", name, 4);
2160                 } */
2161
2162                 next = le32_to_cpu(cc->Next);
2163                 if (!next)
2164                         break;
2165                 remaining -= next;
2166                 cc = (struct create_context *)((char *)cc + next);
2167         }
2168
2169         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2170                 *oplock = rsp->OplockLevel;
2171
2172         return;
2173 }
2174
2175 static int
2176 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2177                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2178 {
2179         struct smb2_create_req *req = iov[0].iov_base;
2180         unsigned int num = *num_iovec;
2181
2182         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2183         if (iov[num].iov_base == NULL)
2184                 return -ENOMEM;
2185         iov[num].iov_len = server->vals->create_lease_size;
2186         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2187         if (!req->CreateContextsOffset)
2188                 req->CreateContextsOffset = cpu_to_le32(
2189                                 sizeof(struct smb2_create_req) +
2190                                 iov[num - 1].iov_len);
2191         le32_add_cpu(&req->CreateContextsLength,
2192                      server->vals->create_lease_size);
2193         *num_iovec = num + 1;
2194         return 0;
2195 }
2196
2197 static struct create_durable_v2 *
2198 create_durable_v2_buf(struct cifs_open_parms *oparms)
2199 {
2200         struct cifs_fid *pfid = oparms->fid;
2201         struct create_durable_v2 *buf;
2202
2203         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2204         if (!buf)
2205                 return NULL;
2206
2207         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2208                                         (struct create_durable_v2, dcontext));
2209         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2210         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2211                                 (struct create_durable_v2, Name));
2212         buf->ccontext.NameLength = cpu_to_le16(4);
2213
2214         /*
2215          * NB: Handle timeout defaults to 0, which allows server to choose
2216          * (most servers default to 120 seconds) and most clients default to 0.
2217          * This can be overridden at mount ("handletimeout=") if the user wants
2218          * a different persistent (or resilient) handle timeout for all opens
2219          * opens on a particular SMB3 mount.
2220          */
2221         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2222         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2223         generate_random_uuid(buf->dcontext.CreateGuid);
2224         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2225
2226         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2227         buf->Name[0] = 'D';
2228         buf->Name[1] = 'H';
2229         buf->Name[2] = '2';
2230         buf->Name[3] = 'Q';
2231         return buf;
2232 }
2233
2234 static struct create_durable_handle_reconnect_v2 *
2235 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2236 {
2237         struct create_durable_handle_reconnect_v2 *buf;
2238
2239         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2240                         GFP_KERNEL);
2241         if (!buf)
2242                 return NULL;
2243
2244         buf->ccontext.DataOffset =
2245                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2246                                      dcontext));
2247         buf->ccontext.DataLength =
2248                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2249         buf->ccontext.NameOffset =
2250                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2251                             Name));
2252         buf->ccontext.NameLength = cpu_to_le16(4);
2253
2254         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2255         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2256         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2257         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2258
2259         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2260         buf->Name[0] = 'D';
2261         buf->Name[1] = 'H';
2262         buf->Name[2] = '2';
2263         buf->Name[3] = 'C';
2264         return buf;
2265 }
2266
2267 static int
2268 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2269                     struct cifs_open_parms *oparms)
2270 {
2271         struct smb2_create_req *req = iov[0].iov_base;
2272         unsigned int num = *num_iovec;
2273
2274         iov[num].iov_base = create_durable_v2_buf(oparms);
2275         if (iov[num].iov_base == NULL)
2276                 return -ENOMEM;
2277         iov[num].iov_len = sizeof(struct create_durable_v2);
2278         if (!req->CreateContextsOffset)
2279                 req->CreateContextsOffset =
2280                         cpu_to_le32(sizeof(struct smb2_create_req) +
2281                                                                 iov[1].iov_len);
2282         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2283         *num_iovec = num + 1;
2284         return 0;
2285 }
2286
2287 static int
2288 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2289                     struct cifs_open_parms *oparms)
2290 {
2291         struct smb2_create_req *req = iov[0].iov_base;
2292         unsigned int num = *num_iovec;
2293
2294         /* indicate that we don't need to relock the file */
2295         oparms->reconnect = false;
2296
2297         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2298         if (iov[num].iov_base == NULL)
2299                 return -ENOMEM;
2300         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2301         if (!req->CreateContextsOffset)
2302                 req->CreateContextsOffset =
2303                         cpu_to_le32(sizeof(struct smb2_create_req) +
2304                                                                 iov[1].iov_len);
2305         le32_add_cpu(&req->CreateContextsLength,
2306                         sizeof(struct create_durable_handle_reconnect_v2));
2307         *num_iovec = num + 1;
2308         return 0;
2309 }
2310
2311 static int
2312 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2313                     struct cifs_open_parms *oparms, bool use_persistent)
2314 {
2315         struct smb2_create_req *req = iov[0].iov_base;
2316         unsigned int num = *num_iovec;
2317
2318         if (use_persistent) {
2319                 if (oparms->reconnect)
2320                         return add_durable_reconnect_v2_context(iov, num_iovec,
2321                                                                 oparms);
2322                 else
2323                         return add_durable_v2_context(iov, num_iovec, oparms);
2324         }
2325
2326         if (oparms->reconnect) {
2327                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2328                 /* indicate that we don't need to relock the file */
2329                 oparms->reconnect = false;
2330         } else
2331                 iov[num].iov_base = create_durable_buf();
2332         if (iov[num].iov_base == NULL)
2333                 return -ENOMEM;
2334         iov[num].iov_len = sizeof(struct create_durable);
2335         if (!req->CreateContextsOffset)
2336                 req->CreateContextsOffset =
2337                         cpu_to_le32(sizeof(struct smb2_create_req) +
2338                                                                 iov[1].iov_len);
2339         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2340         *num_iovec = num + 1;
2341         return 0;
2342 }
2343
2344 /* See MS-SMB2 2.2.13.2.7 */
2345 static struct crt_twarp_ctxt *
2346 create_twarp_buf(__u64 timewarp)
2347 {
2348         struct crt_twarp_ctxt *buf;
2349
2350         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2351         if (!buf)
2352                 return NULL;
2353
2354         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2355                                         (struct crt_twarp_ctxt, Timestamp));
2356         buf->ccontext.DataLength = cpu_to_le32(8);
2357         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2358                                 (struct crt_twarp_ctxt, Name));
2359         buf->ccontext.NameLength = cpu_to_le16(4);
2360         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2361         buf->Name[0] = 'T';
2362         buf->Name[1] = 'W';
2363         buf->Name[2] = 'r';
2364         buf->Name[3] = 'p';
2365         buf->Timestamp = cpu_to_le64(timewarp);
2366         return buf;
2367 }
2368
2369 /* See MS-SMB2 2.2.13.2.7 */
2370 static int
2371 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2372 {
2373         struct smb2_create_req *req = iov[0].iov_base;
2374         unsigned int num = *num_iovec;
2375
2376         iov[num].iov_base = create_twarp_buf(timewarp);
2377         if (iov[num].iov_base == NULL)
2378                 return -ENOMEM;
2379         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2380         if (!req->CreateContextsOffset)
2381                 req->CreateContextsOffset = cpu_to_le32(
2382                                 sizeof(struct smb2_create_req) +
2383                                 iov[num - 1].iov_len);
2384         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2385         *num_iovec = num + 1;
2386         return 0;
2387 }
2388
2389 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2390 static void setup_owner_group_sids(char *buf)
2391 {
2392         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2393
2394         /* Populate the user ownership fields S-1-5-88-1 */
2395         sids->owner.Revision = 1;
2396         sids->owner.NumAuth = 3;
2397         sids->owner.Authority[5] = 5;
2398         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2399         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2400         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2401
2402         /* Populate the group ownership fields S-1-5-88-2 */
2403         sids->group.Revision = 1;
2404         sids->group.NumAuth = 3;
2405         sids->group.Authority[5] = 5;
2406         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2407         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2408         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2409
2410         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2411 }
2412
2413 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2414 static struct crt_sd_ctxt *
2415 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2416 {
2417         struct crt_sd_ctxt *buf;
2418         __u8 *ptr, *aclptr;
2419         unsigned int acelen, acl_size, ace_count;
2420         unsigned int owner_offset = 0;
2421         unsigned int group_offset = 0;
2422         struct smb3_acl acl = {};
2423
2424         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2425
2426         if (set_owner) {
2427                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2428                 *len += sizeof(struct owner_group_sids);
2429         }
2430
2431         buf = kzalloc(*len, GFP_KERNEL);
2432         if (buf == NULL)
2433                 return buf;
2434
2435         ptr = (__u8 *)&buf[1];
2436         if (set_owner) {
2437                 /* offset fields are from beginning of security descriptor not of create context */
2438                 owner_offset = ptr - (__u8 *)&buf->sd;
2439                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2440                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2441                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2442
2443                 setup_owner_group_sids(ptr);
2444                 ptr += sizeof(struct owner_group_sids);
2445         } else {
2446                 buf->sd.OffsetOwner = 0;
2447                 buf->sd.OffsetGroup = 0;
2448         }
2449
2450         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2451         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2452         buf->ccontext.NameLength = cpu_to_le16(4);
2453         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2454         buf->Name[0] = 'S';
2455         buf->Name[1] = 'e';
2456         buf->Name[2] = 'c';
2457         buf->Name[3] = 'D';
2458         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2459
2460         /*
2461          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2462          * and "DP" ie the DACL is present
2463          */
2464         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2465
2466         /* offset owner, group and Sbz1 and SACL are all zero */
2467         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2468         /* Ship the ACL for now. we will copy it into buf later. */
2469         aclptr = ptr;
2470         ptr += sizeof(struct smb3_acl);
2471
2472         /* create one ACE to hold the mode embedded in reserved special SID */
2473         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2474         ptr += acelen;
2475         acl_size = acelen + sizeof(struct smb3_acl);
2476         ace_count = 1;
2477
2478         if (set_owner) {
2479                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2480                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2481                 ptr += acelen;
2482                 acl_size += acelen;
2483                 ace_count += 1;
2484         }
2485
2486         /* and one more ACE to allow access for authenticated users */
2487         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2488         ptr += acelen;
2489         acl_size += acelen;
2490         ace_count += 1;
2491
2492         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2493         acl.AclSize = cpu_to_le16(acl_size);
2494         acl.AceCount = cpu_to_le16(ace_count);
2495         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2496         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2497
2498         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2499         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2500
2501         return buf;
2502 }
2503
2504 static int
2505 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2506 {
2507         struct smb2_create_req *req = iov[0].iov_base;
2508         unsigned int num = *num_iovec;
2509         unsigned int len = 0;
2510
2511         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2512         if (iov[num].iov_base == NULL)
2513                 return -ENOMEM;
2514         iov[num].iov_len = len;
2515         if (!req->CreateContextsOffset)
2516                 req->CreateContextsOffset = cpu_to_le32(
2517                                 sizeof(struct smb2_create_req) +
2518                                 iov[num - 1].iov_len);
2519         le32_add_cpu(&req->CreateContextsLength, len);
2520         *num_iovec = num + 1;
2521         return 0;
2522 }
2523
2524 static struct crt_query_id_ctxt *
2525 create_query_id_buf(void)
2526 {
2527         struct crt_query_id_ctxt *buf;
2528
2529         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2530         if (!buf)
2531                 return NULL;
2532
2533         buf->ccontext.DataOffset = cpu_to_le16(0);
2534         buf->ccontext.DataLength = cpu_to_le32(0);
2535         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2536                                 (struct crt_query_id_ctxt, Name));
2537         buf->ccontext.NameLength = cpu_to_le16(4);
2538         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2539         buf->Name[0] = 'Q';
2540         buf->Name[1] = 'F';
2541         buf->Name[2] = 'i';
2542         buf->Name[3] = 'd';
2543         return buf;
2544 }
2545
2546 /* See MS-SMB2 2.2.13.2.9 */
2547 static int
2548 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2549 {
2550         struct smb2_create_req *req = iov[0].iov_base;
2551         unsigned int num = *num_iovec;
2552
2553         iov[num].iov_base = create_query_id_buf();
2554         if (iov[num].iov_base == NULL)
2555                 return -ENOMEM;
2556         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2557         if (!req->CreateContextsOffset)
2558                 req->CreateContextsOffset = cpu_to_le32(
2559                                 sizeof(struct smb2_create_req) +
2560                                 iov[num - 1].iov_len);
2561         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2562         *num_iovec = num + 1;
2563         return 0;
2564 }
2565
2566 static int
2567 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2568                             const char *treename, const __le16 *path)
2569 {
2570         int treename_len, path_len;
2571         struct nls_table *cp;
2572         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2573
2574         /*
2575          * skip leading "\\"
2576          */
2577         treename_len = strlen(treename);
2578         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2579                 return -EINVAL;
2580
2581         treename += 2;
2582         treename_len -= 2;
2583
2584         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2585
2586         /* make room for one path separator only if @path isn't empty */
2587         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2588
2589         /*
2590          * final path needs to be 8-byte aligned as specified in
2591          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2592          */
2593         *out_size = round_up(*out_len * sizeof(__le16), 8);
2594         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2595         if (!*out_path)
2596                 return -ENOMEM;
2597
2598         cp = load_nls_default();
2599         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2600
2601         /* Do not append the separator if the path is empty */
2602         if (path[0] != cpu_to_le16(0x0000)) {
2603                 UniStrcat(*out_path, sep);
2604                 UniStrcat(*out_path, path);
2605         }
2606
2607         unload_nls(cp);
2608
2609         return 0;
2610 }
2611
2612 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2613                                umode_t mode, struct cifs_tcon *tcon,
2614                                const char *full_path,
2615                                struct cifs_sb_info *cifs_sb)
2616 {
2617         struct smb_rqst rqst;
2618         struct smb2_create_req *req;
2619         struct smb2_create_rsp *rsp = NULL;
2620         struct cifs_ses *ses = tcon->ses;
2621         struct kvec iov[3]; /* make sure at least one for each open context */
2622         struct kvec rsp_iov = {NULL, 0};
2623         int resp_buftype;
2624         int uni_path_len;
2625         __le16 *copy_path = NULL;
2626         int copy_size;
2627         int rc = 0;
2628         unsigned int n_iov = 2;
2629         __u32 file_attributes = 0;
2630         char *pc_buf = NULL;
2631         int flags = 0;
2632         unsigned int total_len;
2633         __le16 *utf16_path = NULL;
2634         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2635
2636         cifs_dbg(FYI, "mkdir\n");
2637
2638         /* resource #1: path allocation */
2639         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2640         if (!utf16_path)
2641                 return -ENOMEM;
2642
2643         if (!ses || !server) {
2644                 rc = -EIO;
2645                 goto err_free_path;
2646         }
2647
2648         /* resource #2: request */
2649         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2650                                  (void **) &req, &total_len);
2651         if (rc)
2652                 goto err_free_path;
2653
2654
2655         if (smb3_encryption_required(tcon))
2656                 flags |= CIFS_TRANSFORM_REQ;
2657
2658         req->ImpersonationLevel = IL_IMPERSONATION;
2659         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2660         /* File attributes ignored on open (used in create though) */
2661         req->FileAttributes = cpu_to_le32(file_attributes);
2662         req->ShareAccess = FILE_SHARE_ALL_LE;
2663         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2664         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2665
2666         iov[0].iov_base = (char *)req;
2667         /* -1 since last byte is buf[0] which is sent below (path) */
2668         iov[0].iov_len = total_len - 1;
2669
2670         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2671
2672         /* [MS-SMB2] 2.2.13 NameOffset:
2673          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2674          * the SMB2 header, the file name includes a prefix that will
2675          * be processed during DFS name normalization as specified in
2676          * section 3.3.5.9. Otherwise, the file name is relative to
2677          * the share that is identified by the TreeId in the SMB2
2678          * header.
2679          */
2680         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2681                 int name_len;
2682
2683                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2684                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2685                                                  &name_len,
2686                                                  tcon->tree_name, utf16_path);
2687                 if (rc)
2688                         goto err_free_req;
2689
2690                 req->NameLength = cpu_to_le16(name_len * 2);
2691                 uni_path_len = copy_size;
2692                 /* free before overwriting resource */
2693                 kfree(utf16_path);
2694                 utf16_path = copy_path;
2695         } else {
2696                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2697                 /* MUST set path len (NameLength) to 0 opening root of share */
2698                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2699                 if (uni_path_len % 8 != 0) {
2700                         copy_size = roundup(uni_path_len, 8);
2701                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2702                         if (!copy_path) {
2703                                 rc = -ENOMEM;
2704                                 goto err_free_req;
2705                         }
2706                         memcpy((char *)copy_path, (const char *)utf16_path,
2707                                uni_path_len);
2708                         uni_path_len = copy_size;
2709                         /* free before overwriting resource */
2710                         kfree(utf16_path);
2711                         utf16_path = copy_path;
2712                 }
2713         }
2714
2715         iov[1].iov_len = uni_path_len;
2716         iov[1].iov_base = utf16_path;
2717         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2718
2719         if (tcon->posix_extensions) {
2720                 /* resource #3: posix buf */
2721                 rc = add_posix_context(iov, &n_iov, mode);
2722                 if (rc)
2723                         goto err_free_req;
2724                 pc_buf = iov[n_iov-1].iov_base;
2725         }
2726
2727
2728         memset(&rqst, 0, sizeof(struct smb_rqst));
2729         rqst.rq_iov = iov;
2730         rqst.rq_nvec = n_iov;
2731
2732         /* no need to inc num_remote_opens because we close it just below */
2733         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2734                                     FILE_WRITE_ATTRIBUTES);
2735         /* resource #4: response buffer */
2736         rc = cifs_send_recv(xid, ses, server,
2737                             &rqst, &resp_buftype, flags, &rsp_iov);
2738         if (rc) {
2739                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2740                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2741                                            CREATE_NOT_FILE,
2742                                            FILE_WRITE_ATTRIBUTES, rc);
2743                 goto err_free_rsp_buf;
2744         }
2745
2746         /*
2747          * Although unlikely to be possible for rsp to be null and rc not set,
2748          * adding check below is slightly safer long term (and quiets Coverity
2749          * warning)
2750          */
2751         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2752         if (rsp == NULL) {
2753                 rc = -EIO;
2754                 kfree(pc_buf);
2755                 goto err_free_req;
2756         }
2757
2758         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2759                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2760
2761         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2762
2763         /* Eventually save off posix specific response info and timestaps */
2764
2765 err_free_rsp_buf:
2766         free_rsp_buf(resp_buftype, rsp);
2767         kfree(pc_buf);
2768 err_free_req:
2769         cifs_small_buf_release(req);
2770 err_free_path:
2771         kfree(utf16_path);
2772         return rc;
2773 }
2774
2775 int
2776 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2777                struct smb_rqst *rqst, __u8 *oplock,
2778                struct cifs_open_parms *oparms, __le16 *path)
2779 {
2780         struct smb2_create_req *req;
2781         unsigned int n_iov = 2;
2782         __u32 file_attributes = 0;
2783         int copy_size;
2784         int uni_path_len;
2785         unsigned int total_len;
2786         struct kvec *iov = rqst->rq_iov;
2787         __le16 *copy_path;
2788         int rc;
2789
2790         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2791                                  (void **) &req, &total_len);
2792         if (rc)
2793                 return rc;
2794
2795         iov[0].iov_base = (char *)req;
2796         /* -1 since last byte is buf[0] which is sent below (path) */
2797         iov[0].iov_len = total_len - 1;
2798
2799         if (oparms->create_options & CREATE_OPTION_READONLY)
2800                 file_attributes |= ATTR_READONLY;
2801         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2802                 file_attributes |= ATTR_SYSTEM;
2803
2804         req->ImpersonationLevel = IL_IMPERSONATION;
2805         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2806         /* File attributes ignored on open (used in create though) */
2807         req->FileAttributes = cpu_to_le32(file_attributes);
2808         req->ShareAccess = FILE_SHARE_ALL_LE;
2809
2810         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2811         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2812         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2813
2814         /* [MS-SMB2] 2.2.13 NameOffset:
2815          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2816          * the SMB2 header, the file name includes a prefix that will
2817          * be processed during DFS name normalization as specified in
2818          * section 3.3.5.9. Otherwise, the file name is relative to
2819          * the share that is identified by the TreeId in the SMB2
2820          * header.
2821          */
2822         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2823                 int name_len;
2824
2825                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2826                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2827                                                  &name_len,
2828                                                  tcon->tree_name, path);
2829                 if (rc)
2830                         return rc;
2831                 req->NameLength = cpu_to_le16(name_len * 2);
2832                 uni_path_len = copy_size;
2833                 path = copy_path;
2834         } else {
2835                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2836                 /* MUST set path len (NameLength) to 0 opening root of share */
2837                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2838                 copy_size = round_up(uni_path_len, 8);
2839                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2840                 if (!copy_path)
2841                         return -ENOMEM;
2842                 memcpy((char *)copy_path, (const char *)path,
2843                        uni_path_len);
2844                 uni_path_len = copy_size;
2845                 path = copy_path;
2846         }
2847
2848         iov[1].iov_len = uni_path_len;
2849         iov[1].iov_base = path;
2850
2851         if ((!server->oplocks) || (tcon->no_lease))
2852                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2853
2854         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2855             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2856                 req->RequestedOplockLevel = *oplock;
2857         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2858                   (oparms->create_options & CREATE_NOT_FILE))
2859                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2860         else {
2861                 rc = add_lease_context(server, iov, &n_iov,
2862                                        oparms->fid->lease_key, oplock);
2863                 if (rc)
2864                         return rc;
2865         }
2866
2867         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2868                 /* need to set Next field of lease context if we request it */
2869                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2870                         struct create_context *ccontext =
2871                             (struct create_context *)iov[n_iov-1].iov_base;
2872                         ccontext->Next =
2873                                 cpu_to_le32(server->vals->create_lease_size);
2874                 }
2875
2876                 rc = add_durable_context(iov, &n_iov, oparms,
2877                                         tcon->use_persistent);
2878                 if (rc)
2879                         return rc;
2880         }
2881
2882         if (tcon->posix_extensions) {
2883                 if (n_iov > 2) {
2884                         struct create_context *ccontext =
2885                             (struct create_context *)iov[n_iov-1].iov_base;
2886                         ccontext->Next =
2887                                 cpu_to_le32(iov[n_iov-1].iov_len);
2888                 }
2889
2890                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2891                 if (rc)
2892                         return rc;
2893         }
2894
2895         if (tcon->snapshot_time) {
2896                 cifs_dbg(FYI, "adding snapshot context\n");
2897                 if (n_iov > 2) {
2898                         struct create_context *ccontext =
2899                             (struct create_context *)iov[n_iov-1].iov_base;
2900                         ccontext->Next =
2901                                 cpu_to_le32(iov[n_iov-1].iov_len);
2902                 }
2903
2904                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2905                 if (rc)
2906                         return rc;
2907         }
2908
2909         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2910                 bool set_mode;
2911                 bool set_owner;
2912
2913                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2914                     (oparms->mode != ACL_NO_MODE))
2915                         set_mode = true;
2916                 else {
2917                         set_mode = false;
2918                         oparms->mode = ACL_NO_MODE;
2919                 }
2920
2921                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2922                         set_owner = true;
2923                 else
2924                         set_owner = false;
2925
2926                 if (set_owner | set_mode) {
2927                         if (n_iov > 2) {
2928                                 struct create_context *ccontext =
2929                                     (struct create_context *)iov[n_iov-1].iov_base;
2930                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2931                         }
2932
2933                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2934                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2935                         if (rc)
2936                                 return rc;
2937                 }
2938         }
2939
2940         if (n_iov > 2) {
2941                 struct create_context *ccontext =
2942                         (struct create_context *)iov[n_iov-1].iov_base;
2943                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2944         }
2945         add_query_id_context(iov, &n_iov);
2946
2947         rqst->rq_nvec = n_iov;
2948         return 0;
2949 }
2950
2951 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2952  * All other vectors are freed by kfree().
2953  */
2954 void
2955 SMB2_open_free(struct smb_rqst *rqst)
2956 {
2957         int i;
2958
2959         if (rqst && rqst->rq_iov) {
2960                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2961                 for (i = 1; i < rqst->rq_nvec; i++)
2962                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2963                                 kfree(rqst->rq_iov[i].iov_base);
2964         }
2965 }
2966
2967 int
2968 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2969           __u8 *oplock, struct smb2_file_all_info *buf,
2970           struct create_posix_rsp *posix,
2971           struct kvec *err_iov, int *buftype)
2972 {
2973         struct smb_rqst rqst;
2974         struct smb2_create_rsp *rsp = NULL;
2975         struct cifs_tcon *tcon = oparms->tcon;
2976         struct cifs_ses *ses = tcon->ses;
2977         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2978         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2979         struct kvec rsp_iov = {NULL, 0};
2980         int resp_buftype = CIFS_NO_BUFFER;
2981         int rc = 0;
2982         int flags = 0;
2983
2984         cifs_dbg(FYI, "create/open\n");
2985         if (!ses || !server)
2986                 return -EIO;
2987
2988         if (smb3_encryption_required(tcon))
2989                 flags |= CIFS_TRANSFORM_REQ;
2990
2991         memset(&rqst, 0, sizeof(struct smb_rqst));
2992         memset(&iov, 0, sizeof(iov));
2993         rqst.rq_iov = iov;
2994         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2995
2996         rc = SMB2_open_init(tcon, server,
2997                             &rqst, oplock, oparms, path);
2998         if (rc)
2999                 goto creat_exit;
3000
3001         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
3002                 oparms->create_options, oparms->desired_access);
3003
3004         rc = cifs_send_recv(xid, ses, server,
3005                             &rqst, &resp_buftype, flags,
3006                             &rsp_iov);
3007         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3008
3009         if (rc != 0) {
3010                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3011                 if (err_iov && rsp) {
3012                         *err_iov = rsp_iov;
3013                         *buftype = resp_buftype;
3014                         resp_buftype = CIFS_NO_BUFFER;
3015                         rsp = NULL;
3016                 }
3017                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3018                                     oparms->create_options, oparms->desired_access, rc);
3019                 if (rc == -EREMCHG) {
3020                         pr_warn_once("server share %s deleted\n",
3021                                      tcon->tree_name);
3022                         tcon->need_reconnect = true;
3023                 }
3024                 goto creat_exit;
3025         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3026                 goto creat_exit;
3027         else
3028                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3029                                      oparms->create_options, oparms->desired_access);
3030
3031         atomic_inc(&tcon->num_remote_opens);
3032         oparms->fid->persistent_fid = rsp->PersistentFileId;
3033         oparms->fid->volatile_fid = rsp->VolatileFileId;
3034         oparms->fid->access = oparms->desired_access;
3035 #ifdef CONFIG_CIFS_DEBUG2
3036         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3037 #endif /* CIFS_DEBUG2 */
3038
3039         if (buf) {
3040                 buf->CreationTime = rsp->CreationTime;
3041                 buf->LastAccessTime = rsp->LastAccessTime;
3042                 buf->LastWriteTime = rsp->LastWriteTime;
3043                 buf->ChangeTime = rsp->ChangeTime;
3044                 buf->AllocationSize = rsp->AllocationSize;
3045                 buf->EndOfFile = rsp->EndofFile;
3046                 buf->Attributes = rsp->FileAttributes;
3047                 buf->NumberOfLinks = cpu_to_le32(1);
3048                 buf->DeletePending = 0;
3049         }
3050
3051
3052         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
3053                             oparms->fid->lease_key, oplock, buf, posix);
3054 creat_exit:
3055         SMB2_open_free(&rqst);
3056         free_rsp_buf(resp_buftype, rsp);
3057         return rc;
3058 }
3059
3060 int
3061 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3062                 struct smb_rqst *rqst,
3063                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3064                 char *in_data, u32 indatalen,
3065                 __u32 max_response_size)
3066 {
3067         struct smb2_ioctl_req *req;
3068         struct kvec *iov = rqst->rq_iov;
3069         unsigned int total_len;
3070         int rc;
3071         char *in_data_buf;
3072
3073         rc = smb2_ioctl_req_init(opcode, tcon, server,
3074                                  (void **) &req, &total_len);
3075         if (rc)
3076                 return rc;
3077
3078         if (indatalen) {
3079                 /*
3080                  * indatalen is usually small at a couple of bytes max, so
3081                  * just allocate through generic pool
3082                  */
3083                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3084                 if (!in_data_buf) {
3085                         cifs_small_buf_release(req);
3086                         return -ENOMEM;
3087                 }
3088         }
3089
3090         req->CtlCode = cpu_to_le32(opcode);
3091         req->PersistentFileId = persistent_fid;
3092         req->VolatileFileId = volatile_fid;
3093
3094         iov[0].iov_base = (char *)req;
3095         /*
3096          * If no input data, the size of ioctl struct in
3097          * protocol spec still includes a 1 byte data buffer,
3098          * but if input data passed to ioctl, we do not
3099          * want to double count this, so we do not send
3100          * the dummy one byte of data in iovec[0] if sending
3101          * input data (in iovec[1]).
3102          */
3103         if (indatalen) {
3104                 req->InputCount = cpu_to_le32(indatalen);
3105                 /* do not set InputOffset if no input data */
3106                 req->InputOffset =
3107                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3108                 rqst->rq_nvec = 2;
3109                 iov[0].iov_len = total_len - 1;
3110                 iov[1].iov_base = in_data_buf;
3111                 iov[1].iov_len = indatalen;
3112         } else {
3113                 rqst->rq_nvec = 1;
3114                 iov[0].iov_len = total_len;
3115         }
3116
3117         req->OutputOffset = 0;
3118         req->OutputCount = 0; /* MBZ */
3119
3120         /*
3121          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3122          * We Could increase default MaxOutputResponse, but that could require
3123          * more credits. Windows typically sets this smaller, but for some
3124          * ioctls it may be useful to allow server to send more. No point
3125          * limiting what the server can send as long as fits in one credit
3126          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3127          * to increase this limit up in the future.
3128          * Note that for snapshot queries that servers like Azure expect that
3129          * the first query be minimal size (and just used to get the number/size
3130          * of previous versions) so response size must be specified as EXACTLY
3131          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3132          * of eight bytes.  Currently that is the only case where we set max
3133          * response size smaller.
3134          */
3135         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3136         req->hdr.CreditCharge =
3137                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3138                                          SMB2_MAX_BUFFER_SIZE));
3139         /* always an FSCTL (for now) */
3140         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3141
3142         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3143         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3144                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3145
3146         return 0;
3147 }
3148
3149 void
3150 SMB2_ioctl_free(struct smb_rqst *rqst)
3151 {
3152         int i;
3153         if (rqst && rqst->rq_iov) {
3154                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3155                 for (i = 1; i < rqst->rq_nvec; i++)
3156                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3157                                 kfree(rqst->rq_iov[i].iov_base);
3158         }
3159 }
3160
3161
3162 /*
3163  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3164  */
3165 int
3166 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3167            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3168            u32 max_out_data_len, char **out_data,
3169            u32 *plen /* returned data len */)
3170 {
3171         struct smb_rqst rqst;
3172         struct smb2_ioctl_rsp *rsp = NULL;
3173         struct cifs_ses *ses;
3174         struct TCP_Server_Info *server;
3175         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3176         struct kvec rsp_iov = {NULL, 0};
3177         int resp_buftype = CIFS_NO_BUFFER;
3178         int rc = 0;
3179         int flags = 0;
3180
3181         cifs_dbg(FYI, "SMB2 IOCTL\n");
3182
3183         if (out_data != NULL)
3184                 *out_data = NULL;
3185
3186         /* zero out returned data len, in case of error */
3187         if (plen)
3188                 *plen = 0;
3189
3190         if (!tcon)
3191                 return -EIO;
3192
3193         ses = tcon->ses;
3194         if (!ses)
3195                 return -EIO;
3196
3197         server = cifs_pick_channel(ses);
3198         if (!server)
3199                 return -EIO;
3200
3201         if (smb3_encryption_required(tcon))
3202                 flags |= CIFS_TRANSFORM_REQ;
3203
3204         memset(&rqst, 0, sizeof(struct smb_rqst));
3205         memset(&iov, 0, sizeof(iov));
3206         rqst.rq_iov = iov;
3207         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3208
3209         rc = SMB2_ioctl_init(tcon, server,
3210                              &rqst, persistent_fid, volatile_fid, opcode,
3211                              in_data, indatalen, max_out_data_len);
3212         if (rc)
3213                 goto ioctl_exit;
3214
3215         rc = cifs_send_recv(xid, ses, server,
3216                             &rqst, &resp_buftype, flags,
3217                             &rsp_iov);
3218         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3219
3220         if (rc != 0)
3221                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3222                                 ses->Suid, 0, opcode, rc);
3223
3224         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3225                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3226                 goto ioctl_exit;
3227         } else if (rc == -EINVAL) {
3228                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3229                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3230                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3231                         goto ioctl_exit;
3232                 }
3233         } else if (rc == -E2BIG) {
3234                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3235                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3236                         goto ioctl_exit;
3237                 }
3238         }
3239
3240         /* check if caller wants to look at return data or just return rc */
3241         if ((plen == NULL) || (out_data == NULL))
3242                 goto ioctl_exit;
3243
3244         /*
3245          * Although unlikely to be possible for rsp to be null and rc not set,
3246          * adding check below is slightly safer long term (and quiets Coverity
3247          * warning)
3248          */
3249         if (rsp == NULL) {
3250                 rc = -EIO;
3251                 goto ioctl_exit;
3252         }
3253
3254         *plen = le32_to_cpu(rsp->OutputCount);
3255
3256         /* We check for obvious errors in the output buffer length and offset */
3257         if (*plen == 0)
3258                 goto ioctl_exit; /* server returned no data */
3259         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3260                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3261                 *plen = 0;
3262                 rc = -EIO;
3263                 goto ioctl_exit;
3264         }
3265
3266         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3267                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3268                         le32_to_cpu(rsp->OutputOffset));
3269                 *plen = 0;
3270                 rc = -EIO;
3271                 goto ioctl_exit;
3272         }
3273
3274         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3275                             *plen, GFP_KERNEL);
3276         if (*out_data == NULL) {
3277                 rc = -ENOMEM;
3278                 goto ioctl_exit;
3279         }
3280
3281 ioctl_exit:
3282         SMB2_ioctl_free(&rqst);
3283         free_rsp_buf(resp_buftype, rsp);
3284         return rc;
3285 }
3286
3287 /*
3288  *   Individual callers to ioctl worker function follow
3289  */
3290
3291 int
3292 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3293                      u64 persistent_fid, u64 volatile_fid)
3294 {
3295         int rc;
3296         struct  compress_ioctl fsctl_input;
3297         char *ret_data = NULL;
3298
3299         fsctl_input.CompressionState =
3300                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3301
3302         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3303                         FSCTL_SET_COMPRESSION,
3304                         (char *)&fsctl_input /* data input */,
3305                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3306                         &ret_data /* out data */, NULL);
3307
3308         cifs_dbg(FYI, "set compression rc %d\n", rc);
3309
3310         return rc;
3311 }
3312
3313 int
3314 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3315                 struct smb_rqst *rqst,
3316                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3317 {
3318         struct smb2_close_req *req;
3319         struct kvec *iov = rqst->rq_iov;
3320         unsigned int total_len;
3321         int rc;
3322
3323         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3324                                  (void **) &req, &total_len);
3325         if (rc)
3326                 return rc;
3327
3328         req->PersistentFileId = persistent_fid;
3329         req->VolatileFileId = volatile_fid;
3330         if (query_attrs)
3331                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3332         else
3333                 req->Flags = 0;
3334         iov[0].iov_base = (char *)req;
3335         iov[0].iov_len = total_len;
3336
3337         return 0;
3338 }
3339
3340 void
3341 SMB2_close_free(struct smb_rqst *rqst)
3342 {
3343         if (rqst && rqst->rq_iov)
3344                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3345 }
3346
3347 int
3348 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3349              u64 persistent_fid, u64 volatile_fid,
3350              struct smb2_file_network_open_info *pbuf)
3351 {
3352         struct smb_rqst rqst;
3353         struct smb2_close_rsp *rsp = NULL;
3354         struct cifs_ses *ses = tcon->ses;
3355         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3356         struct kvec iov[1];
3357         struct kvec rsp_iov;
3358         int resp_buftype = CIFS_NO_BUFFER;
3359         int rc = 0;
3360         int flags = 0;
3361         bool query_attrs = false;
3362
3363         cifs_dbg(FYI, "Close\n");
3364
3365         if (!ses || !server)
3366                 return -EIO;
3367
3368         if (smb3_encryption_required(tcon))
3369                 flags |= CIFS_TRANSFORM_REQ;
3370
3371         memset(&rqst, 0, sizeof(struct smb_rqst));
3372         memset(&iov, 0, sizeof(iov));
3373         rqst.rq_iov = iov;
3374         rqst.rq_nvec = 1;
3375
3376         /* check if need to ask server to return timestamps in close response */
3377         if (pbuf)
3378                 query_attrs = true;
3379
3380         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3381         rc = SMB2_close_init(tcon, server,
3382                              &rqst, persistent_fid, volatile_fid,
3383                              query_attrs);
3384         if (rc)
3385                 goto close_exit;
3386
3387         rc = cifs_send_recv(xid, ses, server,
3388                             &rqst, &resp_buftype, flags, &rsp_iov);
3389         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3390
3391         if (rc != 0) {
3392                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3393                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3394                                      rc);
3395                 goto close_exit;
3396         } else {
3397                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3398                                       ses->Suid);
3399                 /*
3400                  * Note that have to subtract 4 since struct network_open_info
3401                  * has a final 4 byte pad that close response does not have
3402                  */
3403                 if (pbuf)
3404                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3405         }
3406
3407         atomic_dec(&tcon->num_remote_opens);
3408 close_exit:
3409         SMB2_close_free(&rqst);
3410         free_rsp_buf(resp_buftype, rsp);
3411
3412         /* retry close in a worker thread if this one is interrupted */
3413         if (is_interrupt_error(rc)) {
3414                 int tmp_rc;
3415
3416                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3417                                                      volatile_fid);
3418                 if (tmp_rc)
3419                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3420                                  persistent_fid, tmp_rc);
3421         }
3422         return rc;
3423 }
3424
3425 int
3426 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3427                 u64 persistent_fid, u64 volatile_fid)
3428 {
3429         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3430 }
3431
3432 int
3433 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3434                   struct kvec *iov, unsigned int min_buf_size)
3435 {
3436         unsigned int smb_len = iov->iov_len;
3437         char *end_of_smb = smb_len + (char *)iov->iov_base;
3438         char *begin_of_buf = offset + (char *)iov->iov_base;
3439         char *end_of_buf = begin_of_buf + buffer_length;
3440
3441
3442         if (buffer_length < min_buf_size) {
3443                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3444                          buffer_length, min_buf_size);
3445                 return -EINVAL;
3446         }
3447
3448         /* check if beyond RFC1001 maximum length */
3449         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3450                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3451                          buffer_length, smb_len);
3452                 return -EINVAL;
3453         }
3454
3455         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3456                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3457                 return -EINVAL;
3458         }
3459
3460         return 0;
3461 }
3462
3463 /*
3464  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3465  * Caller must free buffer.
3466  */
3467 int
3468 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3469                            struct kvec *iov, unsigned int minbufsize,
3470                            char *data)
3471 {
3472         char *begin_of_buf = offset + (char *)iov->iov_base;
3473         int rc;
3474
3475         if (!data)
3476                 return -EINVAL;
3477
3478         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3479         if (rc)
3480                 return rc;
3481
3482         memcpy(data, begin_of_buf, minbufsize);
3483
3484         return 0;
3485 }
3486
3487 int
3488 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3489                      struct smb_rqst *rqst,
3490                      u64 persistent_fid, u64 volatile_fid,
3491                      u8 info_class, u8 info_type, u32 additional_info,
3492                      size_t output_len, size_t input_len, void *input)
3493 {
3494         struct smb2_query_info_req *req;
3495         struct kvec *iov = rqst->rq_iov;
3496         unsigned int total_len;
3497         int rc;
3498
3499         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3500                                  (void **) &req, &total_len);
3501         if (rc)
3502                 return rc;
3503
3504         req->InfoType = info_type;
3505         req->FileInfoClass = info_class;
3506         req->PersistentFileId = persistent_fid;
3507         req->VolatileFileId = volatile_fid;
3508         req->AdditionalInformation = cpu_to_le32(additional_info);
3509
3510         req->OutputBufferLength = cpu_to_le32(output_len);
3511         if (input_len) {
3512                 req->InputBufferLength = cpu_to_le32(input_len);
3513                 /* total_len for smb query request never close to le16 max */
3514                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3515                 memcpy(req->Buffer, input, input_len);
3516         }
3517
3518         iov[0].iov_base = (char *)req;
3519         /* 1 for Buffer */
3520         iov[0].iov_len = total_len - 1 + input_len;
3521         return 0;
3522 }
3523
3524 void
3525 SMB2_query_info_free(struct smb_rqst *rqst)
3526 {
3527         if (rqst && rqst->rq_iov)
3528                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3529 }
3530
3531 static int
3532 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3533            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3534            u32 additional_info, size_t output_len, size_t min_len, void **data,
3535                 u32 *dlen)
3536 {
3537         struct smb_rqst rqst;
3538         struct smb2_query_info_rsp *rsp = NULL;
3539         struct kvec iov[1];
3540         struct kvec rsp_iov;
3541         int rc = 0;
3542         int resp_buftype = CIFS_NO_BUFFER;
3543         struct cifs_ses *ses = tcon->ses;
3544         struct TCP_Server_Info *server;
3545         int flags = 0;
3546         bool allocated = false;
3547
3548         cifs_dbg(FYI, "Query Info\n");
3549
3550         if (!ses)
3551                 return -EIO;
3552         server = cifs_pick_channel(ses);
3553         if (!server)
3554                 return -EIO;
3555
3556         if (smb3_encryption_required(tcon))
3557                 flags |= CIFS_TRANSFORM_REQ;
3558
3559         memset(&rqst, 0, sizeof(struct smb_rqst));
3560         memset(&iov, 0, sizeof(iov));
3561         rqst.rq_iov = iov;
3562         rqst.rq_nvec = 1;
3563
3564         rc = SMB2_query_info_init(tcon, server,
3565                                   &rqst, persistent_fid, volatile_fid,
3566                                   info_class, info_type, additional_info,
3567                                   output_len, 0, NULL);
3568         if (rc)
3569                 goto qinf_exit;
3570
3571         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3572                                     ses->Suid, info_class, (__u32)info_type);
3573
3574         rc = cifs_send_recv(xid, ses, server,
3575                             &rqst, &resp_buftype, flags, &rsp_iov);
3576         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3577
3578         if (rc) {
3579                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3580                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3581                                 ses->Suid, info_class, (__u32)info_type, rc);
3582                 goto qinf_exit;
3583         }
3584
3585         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3586                                 ses->Suid, info_class, (__u32)info_type);
3587
3588         if (dlen) {
3589                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3590                 if (!*data) {
3591                         *data = kmalloc(*dlen, GFP_KERNEL);
3592                         if (!*data) {
3593                                 cifs_tcon_dbg(VFS,
3594                                         "Error %d allocating memory for acl\n",
3595                                         rc);
3596                                 *dlen = 0;
3597                                 rc = -ENOMEM;
3598                                 goto qinf_exit;
3599                         }
3600                         allocated = true;
3601                 }
3602         }
3603
3604         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3605                                         le32_to_cpu(rsp->OutputBufferLength),
3606                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3607         if (rc && allocated) {
3608                 kfree(*data);
3609                 *data = NULL;
3610                 *dlen = 0;
3611         }
3612
3613 qinf_exit:
3614         SMB2_query_info_free(&rqst);
3615         free_rsp_buf(resp_buftype, rsp);
3616         return rc;
3617 }
3618
3619 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3620         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3621 {
3622         return query_info(xid, tcon, persistent_fid, volatile_fid,
3623                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3624                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3625                           sizeof(struct smb2_file_all_info), (void **)&data,
3626                           NULL);
3627 }
3628
3629 #if 0
3630 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3631 int
3632 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3633                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3634 {
3635         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3636                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3637         *plen = 0;
3638
3639         return query_info(xid, tcon, persistent_fid, volatile_fid,
3640                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3641                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3642         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3643 }
3644 #endif
3645
3646 int
3647 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3648                u64 persistent_fid, u64 volatile_fid,
3649                void **data, u32 *plen, u32 extra_info)
3650 {
3651         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3652                                 extra_info;
3653         *plen = 0;
3654
3655         return query_info(xid, tcon, persistent_fid, volatile_fid,
3656                           0, SMB2_O_INFO_SECURITY, additional_info,
3657                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3658 }
3659
3660 int
3661 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3662                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3663 {
3664         return query_info(xid, tcon, persistent_fid, volatile_fid,
3665                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3666                           sizeof(struct smb2_file_internal_info),
3667                           sizeof(struct smb2_file_internal_info),
3668                           (void **)&uniqueid, NULL);
3669 }
3670
3671 /*
3672  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3673  * See MS-SMB2 2.2.35 and 2.2.36
3674  */
3675
3676 static int
3677 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3678                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3679                  u64 persistent_fid, u64 volatile_fid,
3680                  u32 completion_filter, bool watch_tree)
3681 {
3682         struct smb2_change_notify_req *req;
3683         struct kvec *iov = rqst->rq_iov;
3684         unsigned int total_len;
3685         int rc;
3686
3687         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3688                                  (void **) &req, &total_len);
3689         if (rc)
3690                 return rc;
3691
3692         req->PersistentFileId = persistent_fid;
3693         req->VolatileFileId = volatile_fid;
3694         /* See note 354 of MS-SMB2, 64K max */
3695         req->OutputBufferLength =
3696                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3697         req->CompletionFilter = cpu_to_le32(completion_filter);
3698         if (watch_tree)
3699                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3700         else
3701                 req->Flags = 0;
3702
3703         iov[0].iov_base = (char *)req;
3704         iov[0].iov_len = total_len;
3705
3706         return 0;
3707 }
3708
3709 int
3710 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3711                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3712                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3713                 u32 *plen /* returned data len */)
3714 {
3715         struct cifs_ses *ses = tcon->ses;
3716         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3717         struct smb_rqst rqst;
3718         struct smb2_change_notify_rsp *smb_rsp;
3719         struct kvec iov[1];
3720         struct kvec rsp_iov = {NULL, 0};
3721         int resp_buftype = CIFS_NO_BUFFER;
3722         int flags = 0;
3723         int rc = 0;
3724
3725         cifs_dbg(FYI, "change notify\n");
3726         if (!ses || !server)
3727                 return -EIO;
3728
3729         if (smb3_encryption_required(tcon))
3730                 flags |= CIFS_TRANSFORM_REQ;
3731
3732         memset(&rqst, 0, sizeof(struct smb_rqst));
3733         memset(&iov, 0, sizeof(iov));
3734         if (plen)
3735                 *plen = 0;
3736
3737         rqst.rq_iov = iov;
3738         rqst.rq_nvec = 1;
3739
3740         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3741                               persistent_fid, volatile_fid,
3742                               completion_filter, watch_tree);
3743         if (rc)
3744                 goto cnotify_exit;
3745
3746         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3747                                 (u8)watch_tree, completion_filter);
3748         rc = cifs_send_recv(xid, ses, server,
3749                             &rqst, &resp_buftype, flags, &rsp_iov);
3750
3751         if (rc != 0) {
3752                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3753                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3754                                 (u8)watch_tree, completion_filter, rc);
3755         } else {
3756                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3757                         ses->Suid, (u8)watch_tree, completion_filter);
3758                 /* validate that notify information is plausible */
3759                 if ((rsp_iov.iov_base == NULL) ||
3760                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp)))
3761                         goto cnotify_exit;
3762
3763                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
3764
3765                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
3766                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
3767                                 sizeof(struct file_notify_information));
3768
3769                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
3770                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
3771                 if (*out_data == NULL) {
3772                         rc = -ENOMEM;
3773                         goto cnotify_exit;
3774                 } else
3775                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
3776         }
3777
3778  cnotify_exit:
3779         if (rqst.rq_iov)
3780                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3781         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3782         return rc;
3783 }
3784
3785
3786
3787 /*
3788  * This is a no-op for now. We're not really interested in the reply, but
3789  * rather in the fact that the server sent one and that server->lstrp
3790  * gets updated.
3791  *
3792  * FIXME: maybe we should consider checking that the reply matches request?
3793  */
3794 static void
3795 smb2_echo_callback(struct mid_q_entry *mid)
3796 {
3797         struct TCP_Server_Info *server = mid->callback_data;
3798         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3799         struct cifs_credits credits = { .value = 0, .instance = 0 };
3800
3801         if (mid->mid_state == MID_RESPONSE_RECEIVED
3802             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3803                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3804                 credits.instance = server->reconnect_instance;
3805         }
3806
3807         release_mid(mid);
3808         add_credits(server, &credits, CIFS_ECHO_OP);
3809 }
3810
3811 void smb2_reconnect_server(struct work_struct *work)
3812 {
3813         struct TCP_Server_Info *server = container_of(work,
3814                                         struct TCP_Server_Info, reconnect.work);
3815         struct TCP_Server_Info *pserver;
3816         struct cifs_ses *ses, *ses2;
3817         struct cifs_tcon *tcon, *tcon2;
3818         struct list_head tmp_list, tmp_ses_list;
3819         bool tcon_exist = false, ses_exist = false;
3820         bool tcon_selected = false;
3821         int rc;
3822         bool resched = false;
3823
3824         /* If server is a channel, select the primary channel */
3825         pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
3826
3827         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3828         mutex_lock(&pserver->reconnect_mutex);
3829
3830         INIT_LIST_HEAD(&tmp_list);
3831         INIT_LIST_HEAD(&tmp_ses_list);
3832         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3833
3834         spin_lock(&cifs_tcp_ses_lock);
3835         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3836
3837                 tcon_selected = false;
3838
3839                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3840                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3841                                 tcon->tc_count++;
3842                                 list_add_tail(&tcon->rlist, &tmp_list);
3843                                 tcon_selected = tcon_exist = true;
3844                         }
3845                 }
3846                 /*
3847                  * IPC has the same lifetime as its session and uses its
3848                  * refcount.
3849                  */
3850                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3851                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3852                         tcon_selected = tcon_exist = true;
3853                         ses->ses_count++;
3854                 }
3855                 /*
3856                  * handle the case where channel needs to reconnect
3857                  * binding session, but tcon is healthy (some other channel
3858                  * is active)
3859                  */
3860                 spin_lock(&ses->chan_lock);
3861                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3862                         list_add_tail(&ses->rlist, &tmp_ses_list);
3863                         ses_exist = true;
3864                         ses->ses_count++;
3865                 }
3866                 spin_unlock(&ses->chan_lock);
3867         }
3868         /*
3869          * Get the reference to server struct to be sure that the last call of
3870          * cifs_put_tcon() in the loop below won't release the server pointer.
3871          */
3872         if (tcon_exist || ses_exist)
3873                 server->srv_count++;
3874
3875         spin_unlock(&cifs_tcp_ses_lock);
3876
3877         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3878                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3879                 if (!rc)
3880                         cifs_reopen_persistent_handles(tcon);
3881                 else
3882                         resched = true;
3883                 list_del_init(&tcon->rlist);
3884                 if (tcon->ipc)
3885                         cifs_put_smb_ses(tcon->ses);
3886                 else
3887                         cifs_put_tcon(tcon);
3888         }
3889
3890         if (!ses_exist)
3891                 goto done;
3892
3893         /* allocate a dummy tcon struct used for reconnect */
3894         tcon = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
3895         if (!tcon) {
3896                 resched = true;
3897                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3898                         list_del_init(&ses->rlist);
3899                         cifs_put_smb_ses(ses);
3900                 }
3901                 goto done;
3902         }
3903
3904         tcon->status = TID_GOOD;
3905         tcon->retry = false;
3906         tcon->need_reconnect = false;
3907
3908         /* now reconnect sessions for necessary channels */
3909         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3910                 tcon->ses = ses;
3911                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3912                 if (rc)
3913                         resched = true;
3914                 list_del_init(&ses->rlist);
3915                 cifs_put_smb_ses(ses);
3916         }
3917         kfree(tcon);
3918
3919 done:
3920         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
3921         if (resched)
3922                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3923         mutex_unlock(&pserver->reconnect_mutex);
3924
3925         /* now we can safely release srv struct */
3926         if (tcon_exist || ses_exist)
3927                 cifs_put_tcp_session(server, 1);
3928 }
3929
3930 int
3931 SMB2_echo(struct TCP_Server_Info *server)
3932 {
3933         struct smb2_echo_req *req;
3934         int rc = 0;
3935         struct kvec iov[1];
3936         struct smb_rqst rqst = { .rq_iov = iov,
3937                                  .rq_nvec = 1 };
3938         unsigned int total_len;
3939
3940         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
3941
3942         spin_lock(&server->srv_lock);
3943         if (server->ops->need_neg &&
3944             server->ops->need_neg(server)) {
3945                 spin_unlock(&server->srv_lock);
3946                 /* No need to send echo on newly established connections */
3947                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3948                 return rc;
3949         }
3950         spin_unlock(&server->srv_lock);
3951
3952         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3953                                  (void **)&req, &total_len);
3954         if (rc)
3955                 return rc;
3956
3957         req->hdr.CreditRequest = cpu_to_le16(1);
3958
3959         iov[0].iov_len = total_len;
3960         iov[0].iov_base = (char *)req;
3961
3962         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3963                              server, CIFS_ECHO_OP, NULL);
3964         if (rc)
3965                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3966
3967         cifs_small_buf_release(req);
3968         return rc;
3969 }
3970
3971 void
3972 SMB2_flush_free(struct smb_rqst *rqst)
3973 {
3974         if (rqst && rqst->rq_iov)
3975                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3976 }
3977
3978 int
3979 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3980                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3981                 u64 persistent_fid, u64 volatile_fid)
3982 {
3983         struct smb2_flush_req *req;
3984         struct kvec *iov = rqst->rq_iov;
3985         unsigned int total_len;
3986         int rc;
3987
3988         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3989                                  (void **) &req, &total_len);
3990         if (rc)
3991                 return rc;
3992
3993         req->PersistentFileId = persistent_fid;
3994         req->VolatileFileId = volatile_fid;
3995
3996         iov[0].iov_base = (char *)req;
3997         iov[0].iov_len = total_len;
3998
3999         return 0;
4000 }
4001
4002 int
4003 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4004            u64 volatile_fid)
4005 {
4006         struct cifs_ses *ses = tcon->ses;
4007         struct smb_rqst rqst;
4008         struct kvec iov[1];
4009         struct kvec rsp_iov = {NULL, 0};
4010         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4011         int resp_buftype = CIFS_NO_BUFFER;
4012         int flags = 0;
4013         int rc = 0;
4014
4015         cifs_dbg(FYI, "flush\n");
4016         if (!ses || !(ses->server))
4017                 return -EIO;
4018
4019         if (smb3_encryption_required(tcon))
4020                 flags |= CIFS_TRANSFORM_REQ;
4021
4022         memset(&rqst, 0, sizeof(struct smb_rqst));
4023         memset(&iov, 0, sizeof(iov));
4024         rqst.rq_iov = iov;
4025         rqst.rq_nvec = 1;
4026
4027         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4028                              persistent_fid, volatile_fid);
4029         if (rc)
4030                 goto flush_exit;
4031
4032         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4033         rc = cifs_send_recv(xid, ses, server,
4034                             &rqst, &resp_buftype, flags, &rsp_iov);
4035
4036         if (rc != 0) {
4037                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4038                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4039                                      rc);
4040         } else
4041                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4042                                       ses->Suid);
4043
4044  flush_exit:
4045         SMB2_flush_free(&rqst);
4046         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4047         return rc;
4048 }
4049
4050 /*
4051  * To form a chain of read requests, any read requests after the first should
4052  * have the end_of_chain boolean set to true.
4053  */
4054 static int
4055 smb2_new_read_req(void **buf, unsigned int *total_len,
4056         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4057         unsigned int remaining_bytes, int request_type)
4058 {
4059         int rc = -EACCES;
4060         struct smb2_read_req *req = NULL;
4061         struct smb2_hdr *shdr;
4062         struct TCP_Server_Info *server = io_parms->server;
4063
4064         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4065                                  (void **) &req, total_len);
4066         if (rc)
4067                 return rc;
4068
4069         if (server == NULL)
4070                 return -ECONNABORTED;
4071
4072         shdr = &req->hdr;
4073         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4074
4075         req->PersistentFileId = io_parms->persistent_fid;
4076         req->VolatileFileId = io_parms->volatile_fid;
4077         req->ReadChannelInfoOffset = 0; /* reserved */
4078         req->ReadChannelInfoLength = 0; /* reserved */
4079         req->Channel = 0; /* reserved */
4080         req->MinimumCount = 0;
4081         req->Length = cpu_to_le32(io_parms->length);
4082         req->Offset = cpu_to_le64(io_parms->offset);
4083
4084         trace_smb3_read_enter(0 /* xid */,
4085                         io_parms->persistent_fid,
4086                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4087                         io_parms->offset, io_parms->length);
4088 #ifdef CONFIG_CIFS_SMB_DIRECT
4089         /*
4090          * If we want to do a RDMA write, fill in and append
4091          * smbd_buffer_descriptor_v1 to the end of read request
4092          */
4093         if (server->rdma && rdata && !server->sign &&
4094                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
4095
4096                 struct smbd_buffer_descriptor_v1 *v1;
4097                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4098
4099                 rdata->mr = smbd_register_mr(
4100                                 server->smbd_conn, rdata->pages,
4101                                 rdata->nr_pages, rdata->page_offset,
4102                                 rdata->tailsz, true, need_invalidate);
4103                 if (!rdata->mr)
4104                         return -EAGAIN;
4105
4106                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4107                 if (need_invalidate)
4108                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4109                 req->ReadChannelInfoOffset =
4110                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4111                 req->ReadChannelInfoLength =
4112                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4113                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4114                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4115                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4116                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4117
4118                 *total_len += sizeof(*v1) - 1;
4119         }
4120 #endif
4121         if (request_type & CHAINED_REQUEST) {
4122                 if (!(request_type & END_OF_CHAIN)) {
4123                         /* next 8-byte aligned request */
4124                         *total_len = ALIGN(*total_len, 8);
4125                         shdr->NextCommand = cpu_to_le32(*total_len);
4126                 } else /* END_OF_CHAIN */
4127                         shdr->NextCommand = 0;
4128                 if (request_type & RELATED_REQUEST) {
4129                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4130                         /*
4131                          * Related requests use info from previous read request
4132                          * in chain.
4133                          */
4134                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4135                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4136                         req->PersistentFileId = (u64)-1;
4137                         req->VolatileFileId = (u64)-1;
4138                 }
4139         }
4140         if (remaining_bytes > io_parms->length)
4141                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4142         else
4143                 req->RemainingBytes = 0;
4144
4145         *buf = req;
4146         return rc;
4147 }
4148
4149 static void
4150 smb2_readv_callback(struct mid_q_entry *mid)
4151 {
4152         struct cifs_readdata *rdata = mid->callback_data;
4153         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4154         struct TCP_Server_Info *server = rdata->server;
4155         struct smb2_hdr *shdr =
4156                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4157         struct cifs_credits credits = { .value = 0, .instance = 0 };
4158         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
4159                                  .rq_nvec = 1,
4160                                  .rq_pages = rdata->pages,
4161                                  .rq_offset = rdata->page_offset,
4162                                  .rq_npages = rdata->nr_pages,
4163                                  .rq_pagesz = rdata->pagesz,
4164                                  .rq_tailsz = rdata->tailsz };
4165
4166         WARN_ONCE(rdata->server != mid->server,
4167                   "rdata server %p != mid server %p",
4168                   rdata->server, mid->server);
4169
4170         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4171                  __func__, mid->mid, mid->mid_state, rdata->result,
4172                  rdata->bytes);
4173
4174         switch (mid->mid_state) {
4175         case MID_RESPONSE_RECEIVED:
4176                 credits.value = le16_to_cpu(shdr->CreditRequest);
4177                 credits.instance = server->reconnect_instance;
4178                 /* result already set, check signature */
4179                 if (server->sign && !mid->decrypted) {
4180                         int rc;
4181
4182                         rc = smb2_verify_signature(&rqst, server);
4183                         if (rc)
4184                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4185                                          rc);
4186                 }
4187                 /* FIXME: should this be counted toward the initiating task? */
4188                 task_io_account_read(rdata->got_bytes);
4189                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4190                 break;
4191         case MID_REQUEST_SUBMITTED:
4192         case MID_RETRY_NEEDED:
4193                 rdata->result = -EAGAIN;
4194                 if (server->sign && rdata->got_bytes)
4195                         /* reset bytes number since we can not check a sign */
4196                         rdata->got_bytes = 0;
4197                 /* FIXME: should this be counted toward the initiating task? */
4198                 task_io_account_read(rdata->got_bytes);
4199                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4200                 break;
4201         case MID_RESPONSE_MALFORMED:
4202                 credits.value = le16_to_cpu(shdr->CreditRequest);
4203                 credits.instance = server->reconnect_instance;
4204                 fallthrough;
4205         default:
4206                 rdata->result = -EIO;
4207         }
4208 #ifdef CONFIG_CIFS_SMB_DIRECT
4209         /*
4210          * If this rdata has a memmory registered, the MR can be freed
4211          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4212          * because they have limited number and are used for future I/Os
4213          */
4214         if (rdata->mr) {
4215                 smbd_deregister_mr(rdata->mr);
4216                 rdata->mr = NULL;
4217         }
4218 #endif
4219         if (rdata->result && rdata->result != -ENODATA) {
4220                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4221                 trace_smb3_read_err(0 /* xid */,
4222                                     rdata->cfile->fid.persistent_fid,
4223                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4224                                     rdata->bytes, rdata->result);
4225         } else
4226                 trace_smb3_read_done(0 /* xid */,
4227                                      rdata->cfile->fid.persistent_fid,
4228                                      tcon->tid, tcon->ses->Suid,
4229                                      rdata->offset, rdata->got_bytes);
4230
4231         queue_work(cifsiod_wq, &rdata->work);
4232         release_mid(mid);
4233         add_credits(server, &credits, 0);
4234 }
4235
4236 /* smb2_async_readv - send an async read, and set up mid to handle result */
4237 int
4238 smb2_async_readv(struct cifs_readdata *rdata)
4239 {
4240         int rc, flags = 0;
4241         char *buf;
4242         struct smb2_hdr *shdr;
4243         struct cifs_io_parms io_parms;
4244         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4245                                  .rq_nvec = 1 };
4246         struct TCP_Server_Info *server;
4247         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4248         unsigned int total_len;
4249
4250         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4251                  __func__, rdata->offset, rdata->bytes);
4252
4253         if (!rdata->server)
4254                 rdata->server = cifs_pick_channel(tcon->ses);
4255
4256         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4257         io_parms.server = server = rdata->server;
4258         io_parms.offset = rdata->offset;
4259         io_parms.length = rdata->bytes;
4260         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4261         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4262         io_parms.pid = rdata->pid;
4263
4264         rc = smb2_new_read_req(
4265                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4266         if (rc)
4267                 return rc;
4268
4269         if (smb3_encryption_required(io_parms.tcon))
4270                 flags |= CIFS_TRANSFORM_REQ;
4271
4272         rdata->iov[0].iov_base = buf;
4273         rdata->iov[0].iov_len = total_len;
4274
4275         shdr = (struct smb2_hdr *)buf;
4276
4277         if (rdata->credits.value > 0) {
4278                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4279                                                 SMB2_MAX_BUFFER_SIZE));
4280                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4281
4282                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4283                 if (rc)
4284                         goto async_readv_out;
4285
4286                 flags |= CIFS_HAS_CREDITS;
4287         }
4288
4289         kref_get(&rdata->refcount);
4290         rc = cifs_call_async(server, &rqst,
4291                              cifs_readv_receive, smb2_readv_callback,
4292                              smb3_handle_read_data, rdata, flags,
4293                              &rdata->credits);
4294         if (rc) {
4295                 kref_put(&rdata->refcount, cifs_readdata_release);
4296                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4297                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4298                                     io_parms.tcon->tid,
4299                                     io_parms.tcon->ses->Suid,
4300                                     io_parms.offset, io_parms.length, rc);
4301         }
4302
4303 async_readv_out:
4304         cifs_small_buf_release(buf);
4305         return rc;
4306 }
4307
4308 int
4309 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4310           unsigned int *nbytes, char **buf, int *buf_type)
4311 {
4312         struct smb_rqst rqst;
4313         int resp_buftype, rc;
4314         struct smb2_read_req *req = NULL;
4315         struct smb2_read_rsp *rsp = NULL;
4316         struct kvec iov[1];
4317         struct kvec rsp_iov;
4318         unsigned int total_len;
4319         int flags = CIFS_LOG_ERROR;
4320         struct cifs_ses *ses = io_parms->tcon->ses;
4321
4322         if (!io_parms->server)
4323                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4324
4325         *nbytes = 0;
4326         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4327         if (rc)
4328                 return rc;
4329
4330         if (smb3_encryption_required(io_parms->tcon))
4331                 flags |= CIFS_TRANSFORM_REQ;
4332
4333         iov[0].iov_base = (char *)req;
4334         iov[0].iov_len = total_len;
4335
4336         memset(&rqst, 0, sizeof(struct smb_rqst));
4337         rqst.rq_iov = iov;
4338         rqst.rq_nvec = 1;
4339
4340         rc = cifs_send_recv(xid, ses, io_parms->server,
4341                             &rqst, &resp_buftype, flags, &rsp_iov);
4342         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4343
4344         if (rc) {
4345                 if (rc != -ENODATA) {
4346                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4347                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4348                         trace_smb3_read_err(xid,
4349                                             req->PersistentFileId,
4350                                             io_parms->tcon->tid, ses->Suid,
4351                                             io_parms->offset, io_parms->length,
4352                                             rc);
4353                 } else
4354                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4355                                              ses->Suid, io_parms->offset, 0);
4356                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4357                 cifs_small_buf_release(req);
4358                 return rc == -ENODATA ? 0 : rc;
4359         } else
4360                 trace_smb3_read_done(xid,
4361                                     req->PersistentFileId,
4362                                     io_parms->tcon->tid, ses->Suid,
4363                                     io_parms->offset, io_parms->length);
4364
4365         cifs_small_buf_release(req);
4366
4367         *nbytes = le32_to_cpu(rsp->DataLength);
4368         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4369             (*nbytes > io_parms->length)) {
4370                 cifs_dbg(FYI, "bad length %d for count %d\n",
4371                          *nbytes, io_parms->length);
4372                 rc = -EIO;
4373                 *nbytes = 0;
4374         }
4375
4376         if (*buf) {
4377                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4378                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4379         } else if (resp_buftype != CIFS_NO_BUFFER) {
4380                 *buf = rsp_iov.iov_base;
4381                 if (resp_buftype == CIFS_SMALL_BUFFER)
4382                         *buf_type = CIFS_SMALL_BUFFER;
4383                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4384                         *buf_type = CIFS_LARGE_BUFFER;
4385         }
4386         return rc;
4387 }
4388
4389 /*
4390  * Check the mid_state and signature on received buffer (if any), and queue the
4391  * workqueue completion task.
4392  */
4393 static void
4394 smb2_writev_callback(struct mid_q_entry *mid)
4395 {
4396         struct cifs_writedata *wdata = mid->callback_data;
4397         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4398         struct TCP_Server_Info *server = wdata->server;
4399         unsigned int written;
4400         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4401         struct cifs_credits credits = { .value = 0, .instance = 0 };
4402
4403         WARN_ONCE(wdata->server != mid->server,
4404                   "wdata server %p != mid server %p",
4405                   wdata->server, mid->server);
4406
4407         switch (mid->mid_state) {
4408         case MID_RESPONSE_RECEIVED:
4409                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4410                 credits.instance = server->reconnect_instance;
4411                 wdata->result = smb2_check_receive(mid, server, 0);
4412                 if (wdata->result != 0)
4413                         break;
4414
4415                 written = le32_to_cpu(rsp->DataLength);
4416                 /*
4417                  * Mask off high 16 bits when bytes written as returned
4418                  * by the server is greater than bytes requested by the
4419                  * client. OS/2 servers are known to set incorrect
4420                  * CountHigh values.
4421                  */
4422                 if (written > wdata->bytes)
4423                         written &= 0xFFFF;
4424
4425                 if (written < wdata->bytes)
4426                         wdata->result = -ENOSPC;
4427                 else
4428                         wdata->bytes = written;
4429                 break;
4430         case MID_REQUEST_SUBMITTED:
4431         case MID_RETRY_NEEDED:
4432                 wdata->result = -EAGAIN;
4433                 break;
4434         case MID_RESPONSE_MALFORMED:
4435                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4436                 credits.instance = server->reconnect_instance;
4437                 fallthrough;
4438         default:
4439                 wdata->result = -EIO;
4440                 break;
4441         }
4442 #ifdef CONFIG_CIFS_SMB_DIRECT
4443         /*
4444          * If this wdata has a memory registered, the MR can be freed
4445          * The number of MRs available is limited, it's important to recover
4446          * used MR as soon as I/O is finished. Hold MR longer in the later
4447          * I/O process can possibly result in I/O deadlock due to lack of MR
4448          * to send request on I/O retry
4449          */
4450         if (wdata->mr) {
4451                 smbd_deregister_mr(wdata->mr);
4452                 wdata->mr = NULL;
4453         }
4454 #endif
4455         if (wdata->result) {
4456                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4457                 trace_smb3_write_err(0 /* no xid */,
4458                                      wdata->cfile->fid.persistent_fid,
4459                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4460                                      wdata->bytes, wdata->result);
4461                 if (wdata->result == -ENOSPC)
4462                         pr_warn_once("Out of space writing to %s\n",
4463                                      tcon->tree_name);
4464         } else
4465                 trace_smb3_write_done(0 /* no xid */,
4466                                       wdata->cfile->fid.persistent_fid,
4467                                       tcon->tid, tcon->ses->Suid,
4468                                       wdata->offset, wdata->bytes);
4469
4470         queue_work(cifsiod_wq, &wdata->work);
4471         release_mid(mid);
4472         add_credits(server, &credits, 0);
4473 }
4474
4475 /* smb2_async_writev - send an async write, and set up mid to handle result */
4476 int
4477 smb2_async_writev(struct cifs_writedata *wdata,
4478                   void (*release)(struct kref *kref))
4479 {
4480         int rc = -EACCES, flags = 0;
4481         struct smb2_write_req *req = NULL;
4482         struct smb2_hdr *shdr;
4483         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4484         struct TCP_Server_Info *server = wdata->server;
4485         struct kvec iov[1];
4486         struct smb_rqst rqst = { };
4487         unsigned int total_len;
4488
4489         if (!wdata->server)
4490                 server = wdata->server = cifs_pick_channel(tcon->ses);
4491
4492         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4493                                  (void **) &req, &total_len);
4494         if (rc)
4495                 return rc;
4496
4497         if (smb3_encryption_required(tcon))
4498                 flags |= CIFS_TRANSFORM_REQ;
4499
4500         shdr = (struct smb2_hdr *)req;
4501         shdr->Id.SyncId.ProcessId = cpu_to_le32(wdata->cfile->pid);
4502
4503         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4504         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4505         req->WriteChannelInfoOffset = 0;
4506         req->WriteChannelInfoLength = 0;
4507         req->Channel = 0;
4508         req->Offset = cpu_to_le64(wdata->offset);
4509         req->DataOffset = cpu_to_le16(
4510                                 offsetof(struct smb2_write_req, Buffer));
4511         req->RemainingBytes = 0;
4512
4513         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4514                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4515 #ifdef CONFIG_CIFS_SMB_DIRECT
4516         /*
4517          * If we want to do a server RDMA read, fill in and append
4518          * smbd_buffer_descriptor_v1 to the end of write request
4519          */
4520         if (server->rdma && !server->sign && wdata->bytes >=
4521                 server->smbd_conn->rdma_readwrite_threshold) {
4522
4523                 struct smbd_buffer_descriptor_v1 *v1;
4524                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4525
4526                 wdata->mr = smbd_register_mr(
4527                                 server->smbd_conn, wdata->pages,
4528                                 wdata->nr_pages, wdata->page_offset,
4529                                 wdata->tailsz, false, need_invalidate);
4530                 if (!wdata->mr) {
4531                         rc = -EAGAIN;
4532                         goto async_writev_out;
4533                 }
4534                 req->Length = 0;
4535                 req->DataOffset = 0;
4536                 if (wdata->nr_pages > 1)
4537                         req->RemainingBytes =
4538                                 cpu_to_le32(
4539                                         (wdata->nr_pages - 1) * wdata->pagesz -
4540                                         wdata->page_offset + wdata->tailsz
4541                                 );
4542                 else
4543                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4544                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4545                 if (need_invalidate)
4546                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4547                 req->WriteChannelInfoOffset =
4548                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4549                 req->WriteChannelInfoLength =
4550                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4551                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4552                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4553                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4554                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4555         }
4556 #endif
4557         iov[0].iov_len = total_len - 1;
4558         iov[0].iov_base = (char *)req;
4559
4560         rqst.rq_iov = iov;
4561         rqst.rq_nvec = 1;
4562         rqst.rq_pages = wdata->pages;
4563         rqst.rq_offset = wdata->page_offset;
4564         rqst.rq_npages = wdata->nr_pages;
4565         rqst.rq_pagesz = wdata->pagesz;
4566         rqst.rq_tailsz = wdata->tailsz;
4567 #ifdef CONFIG_CIFS_SMB_DIRECT
4568         if (wdata->mr) {
4569                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4570                 rqst.rq_npages = 0;
4571         }
4572 #endif
4573         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4574                  wdata->offset, wdata->bytes);
4575
4576 #ifdef CONFIG_CIFS_SMB_DIRECT
4577         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4578         if (!wdata->mr)
4579                 req->Length = cpu_to_le32(wdata->bytes);
4580 #else
4581         req->Length = cpu_to_le32(wdata->bytes);
4582 #endif
4583
4584         if (wdata->credits.value > 0) {
4585                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4586                                                     SMB2_MAX_BUFFER_SIZE));
4587                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4588
4589                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4590                 if (rc)
4591                         goto async_writev_out;
4592
4593                 flags |= CIFS_HAS_CREDITS;
4594         }
4595
4596         kref_get(&wdata->refcount);
4597         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4598                              wdata, flags, &wdata->credits);
4599
4600         if (rc) {
4601                 trace_smb3_write_err(0 /* no xid */,
4602                                      req->PersistentFileId,
4603                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4604                                      wdata->bytes, rc);
4605                 kref_put(&wdata->refcount, release);
4606                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4607         }
4608
4609 async_writev_out:
4610         cifs_small_buf_release(req);
4611         return rc;
4612 }
4613
4614 /*
4615  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4616  * The length field from io_parms must be at least 1 and indicates a number of
4617  * elements with data to write that begins with position 1 in iov array. All
4618  * data length is specified by count.
4619  */
4620 int
4621 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4622            unsigned int *nbytes, struct kvec *iov, int n_vec)
4623 {
4624         struct smb_rqst rqst;
4625         int rc = 0;
4626         struct smb2_write_req *req = NULL;
4627         struct smb2_write_rsp *rsp = NULL;
4628         int resp_buftype;
4629         struct kvec rsp_iov;
4630         int flags = 0;
4631         unsigned int total_len;
4632         struct TCP_Server_Info *server;
4633
4634         *nbytes = 0;
4635
4636         if (n_vec < 1)
4637                 return rc;
4638
4639         if (!io_parms->server)
4640                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4641         server = io_parms->server;
4642         if (server == NULL)
4643                 return -ECONNABORTED;
4644
4645         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4646                                  (void **) &req, &total_len);
4647         if (rc)
4648                 return rc;
4649
4650         if (smb3_encryption_required(io_parms->tcon))
4651                 flags |= CIFS_TRANSFORM_REQ;
4652
4653         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4654
4655         req->PersistentFileId = io_parms->persistent_fid;
4656         req->VolatileFileId = io_parms->volatile_fid;
4657         req->WriteChannelInfoOffset = 0;
4658         req->WriteChannelInfoLength = 0;
4659         req->Channel = 0;
4660         req->Length = cpu_to_le32(io_parms->length);
4661         req->Offset = cpu_to_le64(io_parms->offset);
4662         req->DataOffset = cpu_to_le16(
4663                                 offsetof(struct smb2_write_req, Buffer));
4664         req->RemainingBytes = 0;
4665
4666         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4667                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4668                 io_parms->offset, io_parms->length);
4669
4670         iov[0].iov_base = (char *)req;
4671         /* 1 for Buffer */
4672         iov[0].iov_len = total_len - 1;
4673
4674         memset(&rqst, 0, sizeof(struct smb_rqst));
4675         rqst.rq_iov = iov;
4676         rqst.rq_nvec = n_vec + 1;
4677
4678         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4679                             &rqst,
4680                             &resp_buftype, flags, &rsp_iov);
4681         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4682
4683         if (rc) {
4684                 trace_smb3_write_err(xid,
4685                                      req->PersistentFileId,
4686                                      io_parms->tcon->tid,
4687                                      io_parms->tcon->ses->Suid,
4688                                      io_parms->offset, io_parms->length, rc);
4689                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4690                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4691         } else {
4692                 *nbytes = le32_to_cpu(rsp->DataLength);
4693                 trace_smb3_write_done(xid,
4694                                       req->PersistentFileId,
4695                                       io_parms->tcon->tid,
4696                                       io_parms->tcon->ses->Suid,
4697                                       io_parms->offset, *nbytes);
4698         }
4699
4700         cifs_small_buf_release(req);
4701         free_rsp_buf(resp_buftype, rsp);
4702         return rc;
4703 }
4704
4705 int posix_info_sid_size(const void *beg, const void *end)
4706 {
4707         size_t subauth;
4708         int total;
4709
4710         if (beg + 1 > end)
4711                 return -1;
4712
4713         subauth = *(u8 *)(beg+1);
4714         if (subauth < 1 || subauth > 15)
4715                 return -1;
4716
4717         total = 1 + 1 + 6 + 4*subauth;
4718         if (beg + total > end)
4719                 return -1;
4720
4721         return total;
4722 }
4723
4724 int posix_info_parse(const void *beg, const void *end,
4725                      struct smb2_posix_info_parsed *out)
4726
4727 {
4728         int total_len = 0;
4729         int owner_len, group_len;
4730         int name_len;
4731         const void *owner_sid;
4732         const void *group_sid;
4733         const void *name;
4734
4735         /* if no end bound given, assume payload to be correct */
4736         if (!end) {
4737                 const struct smb2_posix_info *p = beg;
4738
4739                 end = beg + le32_to_cpu(p->NextEntryOffset);
4740                 /* last element will have a 0 offset, pick a sensible bound */
4741                 if (end == beg)
4742                         end += 0xFFFF;
4743         }
4744
4745         /* check base buf */
4746         if (beg + sizeof(struct smb2_posix_info) > end)
4747                 return -1;
4748         total_len = sizeof(struct smb2_posix_info);
4749
4750         /* check owner sid */
4751         owner_sid = beg + total_len;
4752         owner_len = posix_info_sid_size(owner_sid, end);
4753         if (owner_len < 0)
4754                 return -1;
4755         total_len += owner_len;
4756
4757         /* check group sid */
4758         group_sid = beg + total_len;
4759         group_len = posix_info_sid_size(group_sid, end);
4760         if (group_len < 0)
4761                 return -1;
4762         total_len += group_len;
4763
4764         /* check name len */
4765         if (beg + total_len + 4 > end)
4766                 return -1;
4767         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4768         if (name_len < 1 || name_len > 0xFFFF)
4769                 return -1;
4770         total_len += 4;
4771
4772         /* check name */
4773         name = beg + total_len;
4774         if (name + name_len > end)
4775                 return -1;
4776         total_len += name_len;
4777
4778         if (out) {
4779                 out->base = beg;
4780                 out->size = total_len;
4781                 out->name_len = name_len;
4782                 out->name = name;
4783                 memcpy(&out->owner, owner_sid, owner_len);
4784                 memcpy(&out->group, group_sid, group_len);
4785         }
4786         return total_len;
4787 }
4788
4789 static int posix_info_extra_size(const void *beg, const void *end)
4790 {
4791         int len = posix_info_parse(beg, end, NULL);
4792
4793         if (len < 0)
4794                 return -1;
4795         return len - sizeof(struct smb2_posix_info);
4796 }
4797
4798 static unsigned int
4799 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4800             size_t size)
4801 {
4802         int len;
4803         unsigned int entrycount = 0;
4804         unsigned int next_offset = 0;
4805         char *entryptr;
4806         FILE_DIRECTORY_INFO *dir_info;
4807
4808         if (bufstart == NULL)
4809                 return 0;
4810
4811         entryptr = bufstart;
4812
4813         while (1) {
4814                 if (entryptr + next_offset < entryptr ||
4815                     entryptr + next_offset > end_of_buf ||
4816                     entryptr + next_offset + size > end_of_buf) {
4817                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4818                         break;
4819                 }
4820
4821                 entryptr = entryptr + next_offset;
4822                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4823
4824                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4825                         len = posix_info_extra_size(entryptr, end_of_buf);
4826                 else
4827                         len = le32_to_cpu(dir_info->FileNameLength);
4828
4829                 if (len < 0 ||
4830                     entryptr + len < entryptr ||
4831                     entryptr + len > end_of_buf ||
4832                     entryptr + len + size > end_of_buf) {
4833                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4834                                  end_of_buf);
4835                         break;
4836                 }
4837
4838                 *lastentry = entryptr;
4839                 entrycount++;
4840
4841                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4842                 if (!next_offset)
4843                         break;
4844         }
4845
4846         return entrycount;
4847 }
4848
4849 /*
4850  * Readdir/FindFirst
4851  */
4852 int SMB2_query_directory_init(const unsigned int xid,
4853                               struct cifs_tcon *tcon,
4854                               struct TCP_Server_Info *server,
4855                               struct smb_rqst *rqst,
4856                               u64 persistent_fid, u64 volatile_fid,
4857                               int index, int info_level)
4858 {
4859         struct smb2_query_directory_req *req;
4860         unsigned char *bufptr;
4861         __le16 asteriks = cpu_to_le16('*');
4862         unsigned int output_size = CIFSMaxBufSize -
4863                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4864                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4865         unsigned int total_len;
4866         struct kvec *iov = rqst->rq_iov;
4867         int len, rc;
4868
4869         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4870                                  (void **) &req, &total_len);
4871         if (rc)
4872                 return rc;
4873
4874         switch (info_level) {
4875         case SMB_FIND_FILE_DIRECTORY_INFO:
4876                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4877                 break;
4878         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4879                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4880                 break;
4881         case SMB_FIND_FILE_POSIX_INFO:
4882                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4883                 break;
4884         default:
4885                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4886                         info_level);
4887                 return -EINVAL;
4888         }
4889
4890         req->FileIndex = cpu_to_le32(index);
4891         req->PersistentFileId = persistent_fid;
4892         req->VolatileFileId = volatile_fid;
4893
4894         len = 0x2;
4895         bufptr = req->Buffer;
4896         memcpy(bufptr, &asteriks, len);
4897
4898         req->FileNameOffset =
4899                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4900         req->FileNameLength = cpu_to_le16(len);
4901         /*
4902          * BB could be 30 bytes or so longer if we used SMB2 specific
4903          * buffer lengths, but this is safe and close enough.
4904          */
4905         output_size = min_t(unsigned int, output_size, server->maxBuf);
4906         output_size = min_t(unsigned int, output_size, 2 << 15);
4907         req->OutputBufferLength = cpu_to_le32(output_size);
4908
4909         iov[0].iov_base = (char *)req;
4910         /* 1 for Buffer */
4911         iov[0].iov_len = total_len - 1;
4912
4913         iov[1].iov_base = (char *)(req->Buffer);
4914         iov[1].iov_len = len;
4915
4916         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4917                         tcon->ses->Suid, index, output_size);
4918
4919         return 0;
4920 }
4921
4922 void SMB2_query_directory_free(struct smb_rqst *rqst)
4923 {
4924         if (rqst && rqst->rq_iov) {
4925                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4926         }
4927 }
4928
4929 int
4930 smb2_parse_query_directory(struct cifs_tcon *tcon,
4931                            struct kvec *rsp_iov,
4932                            int resp_buftype,
4933                            struct cifs_search_info *srch_inf)
4934 {
4935         struct smb2_query_directory_rsp *rsp;
4936         size_t info_buf_size;
4937         char *end_of_smb;
4938         int rc;
4939
4940         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4941
4942         switch (srch_inf->info_level) {
4943         case SMB_FIND_FILE_DIRECTORY_INFO:
4944                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4945                 break;
4946         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4947                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4948                 break;
4949         case SMB_FIND_FILE_POSIX_INFO:
4950                 /* note that posix payload are variable size */
4951                 info_buf_size = sizeof(struct smb2_posix_info);
4952                 break;
4953         default:
4954                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4955                          srch_inf->info_level);
4956                 return -EINVAL;
4957         }
4958
4959         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4960                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4961                                info_buf_size);
4962         if (rc) {
4963                 cifs_tcon_dbg(VFS, "bad info payload");
4964                 return rc;
4965         }
4966
4967         srch_inf->unicode = true;
4968
4969         if (srch_inf->ntwrk_buf_start) {
4970                 if (srch_inf->smallBuf)
4971                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4972                 else
4973                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4974         }
4975         srch_inf->ntwrk_buf_start = (char *)rsp;
4976         srch_inf->srch_entries_start = srch_inf->last_entry =
4977                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4978         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4979
4980         srch_inf->entries_in_buffer = num_entries(
4981                 srch_inf->info_level,
4982                 srch_inf->srch_entries_start,
4983                 end_of_smb,
4984                 &srch_inf->last_entry,
4985                 info_buf_size);
4986
4987         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4988         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4989                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4990                  srch_inf->srch_entries_start, srch_inf->last_entry);
4991         if (resp_buftype == CIFS_LARGE_BUFFER)
4992                 srch_inf->smallBuf = false;
4993         else if (resp_buftype == CIFS_SMALL_BUFFER)
4994                 srch_inf->smallBuf = true;
4995         else
4996                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4997
4998         return 0;
4999 }
5000
5001 int
5002 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5003                      u64 persistent_fid, u64 volatile_fid, int index,
5004                      struct cifs_search_info *srch_inf)
5005 {
5006         struct smb_rqst rqst;
5007         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5008         struct smb2_query_directory_rsp *rsp = NULL;
5009         int resp_buftype = CIFS_NO_BUFFER;
5010         struct kvec rsp_iov;
5011         int rc = 0;
5012         struct cifs_ses *ses = tcon->ses;
5013         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5014         int flags = 0;
5015
5016         if (!ses || !(ses->server))
5017                 return -EIO;
5018
5019         if (smb3_encryption_required(tcon))
5020                 flags |= CIFS_TRANSFORM_REQ;
5021
5022         memset(&rqst, 0, sizeof(struct smb_rqst));
5023         memset(&iov, 0, sizeof(iov));
5024         rqst.rq_iov = iov;
5025         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5026
5027         rc = SMB2_query_directory_init(xid, tcon, server,
5028                                        &rqst, persistent_fid,
5029                                        volatile_fid, index,
5030                                        srch_inf->info_level);
5031         if (rc)
5032                 goto qdir_exit;
5033
5034         rc = cifs_send_recv(xid, ses, server,
5035                             &rqst, &resp_buftype, flags, &rsp_iov);
5036         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5037
5038         if (rc) {
5039                 if (rc == -ENODATA &&
5040                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5041                         trace_smb3_query_dir_done(xid, persistent_fid,
5042                                 tcon->tid, tcon->ses->Suid, index, 0);
5043                         srch_inf->endOfSearch = true;
5044                         rc = 0;
5045                 } else {
5046                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5047                                 tcon->ses->Suid, index, 0, rc);
5048                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5049                 }
5050                 goto qdir_exit;
5051         }
5052
5053         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5054                                         srch_inf);
5055         if (rc) {
5056                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5057                         tcon->ses->Suid, index, 0, rc);
5058                 goto qdir_exit;
5059         }
5060         resp_buftype = CIFS_NO_BUFFER;
5061
5062         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5063                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5064
5065 qdir_exit:
5066         SMB2_query_directory_free(&rqst);
5067         free_rsp_buf(resp_buftype, rsp);
5068         return rc;
5069 }
5070
5071 int
5072 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5073                    struct smb_rqst *rqst,
5074                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5075                    u8 info_class, u8 info_type, u32 additional_info,
5076                    void **data, unsigned int *size)
5077 {
5078         struct smb2_set_info_req *req;
5079         struct kvec *iov = rqst->rq_iov;
5080         unsigned int i, total_len;
5081         int rc;
5082
5083         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5084                                  (void **) &req, &total_len);
5085         if (rc)
5086                 return rc;
5087
5088         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5089         req->InfoType = info_type;
5090         req->FileInfoClass = info_class;
5091         req->PersistentFileId = persistent_fid;
5092         req->VolatileFileId = volatile_fid;
5093         req->AdditionalInformation = cpu_to_le32(additional_info);
5094
5095         req->BufferOffset =
5096                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
5097         req->BufferLength = cpu_to_le32(*size);
5098
5099         memcpy(req->Buffer, *data, *size);
5100         total_len += *size;
5101
5102         iov[0].iov_base = (char *)req;
5103         /* 1 for Buffer */
5104         iov[0].iov_len = total_len - 1;
5105
5106         for (i = 1; i < rqst->rq_nvec; i++) {
5107                 le32_add_cpu(&req->BufferLength, size[i]);
5108                 iov[i].iov_base = (char *)data[i];
5109                 iov[i].iov_len = size[i];
5110         }
5111
5112         return 0;
5113 }
5114
5115 void
5116 SMB2_set_info_free(struct smb_rqst *rqst)
5117 {
5118         if (rqst && rqst->rq_iov)
5119                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5120 }
5121
5122 static int
5123 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5124                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5125                u8 info_type, u32 additional_info, unsigned int num,
5126                 void **data, unsigned int *size)
5127 {
5128         struct smb_rqst rqst;
5129         struct smb2_set_info_rsp *rsp = NULL;
5130         struct kvec *iov;
5131         struct kvec rsp_iov;
5132         int rc = 0;
5133         int resp_buftype;
5134         struct cifs_ses *ses = tcon->ses;
5135         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5136         int flags = 0;
5137
5138         if (!ses || !server)
5139                 return -EIO;
5140
5141         if (!num)
5142                 return -EINVAL;
5143
5144         if (smb3_encryption_required(tcon))
5145                 flags |= CIFS_TRANSFORM_REQ;
5146
5147         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5148         if (!iov)
5149                 return -ENOMEM;
5150
5151         memset(&rqst, 0, sizeof(struct smb_rqst));
5152         rqst.rq_iov = iov;
5153         rqst.rq_nvec = num;
5154
5155         rc = SMB2_set_info_init(tcon, server,
5156                                 &rqst, persistent_fid, volatile_fid, pid,
5157                                 info_class, info_type, additional_info,
5158                                 data, size);
5159         if (rc) {
5160                 kfree(iov);
5161                 return rc;
5162         }
5163
5164
5165         rc = cifs_send_recv(xid, ses, server,
5166                             &rqst, &resp_buftype, flags,
5167                             &rsp_iov);
5168         SMB2_set_info_free(&rqst);
5169         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5170
5171         if (rc != 0) {
5172                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5173                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5174                                 ses->Suid, info_class, (__u32)info_type, rc);
5175         }
5176
5177         free_rsp_buf(resp_buftype, rsp);
5178         kfree(iov);
5179         return rc;
5180 }
5181
5182 int
5183 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5184              u64 volatile_fid, u32 pid, __le64 *eof)
5185 {
5186         struct smb2_file_eof_info info;
5187         void *data;
5188         unsigned int size;
5189
5190         info.EndOfFile = *eof;
5191
5192         data = &info;
5193         size = sizeof(struct smb2_file_eof_info);
5194
5195         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5196
5197         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5198                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5199                         0, 1, &data, &size);
5200 }
5201
5202 int
5203 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5204                 u64 persistent_fid, u64 volatile_fid,
5205                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5206 {
5207         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5208                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5209                         1, (void **)&pnntsd, &pacllen);
5210 }
5211
5212 int
5213 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5214             u64 persistent_fid, u64 volatile_fid,
5215             struct smb2_file_full_ea_info *buf, int len)
5216 {
5217         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5218                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5219                 0, 1, (void **)&buf, &len);
5220 }
5221
5222 int
5223 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5224                   const u64 persistent_fid, const u64 volatile_fid,
5225                   __u8 oplock_level)
5226 {
5227         struct smb_rqst rqst;
5228         int rc;
5229         struct smb2_oplock_break *req = NULL;
5230         struct cifs_ses *ses = tcon->ses;
5231         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5232         int flags = CIFS_OBREAK_OP;
5233         unsigned int total_len;
5234         struct kvec iov[1];
5235         struct kvec rsp_iov;
5236         int resp_buf_type;
5237
5238         cifs_dbg(FYI, "SMB2_oplock_break\n");
5239         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5240                                  (void **) &req, &total_len);
5241         if (rc)
5242                 return rc;
5243
5244         if (smb3_encryption_required(tcon))
5245                 flags |= CIFS_TRANSFORM_REQ;
5246
5247         req->VolatileFid = volatile_fid;
5248         req->PersistentFid = persistent_fid;
5249         req->OplockLevel = oplock_level;
5250         req->hdr.CreditRequest = cpu_to_le16(1);
5251
5252         flags |= CIFS_NO_RSP_BUF;
5253
5254         iov[0].iov_base = (char *)req;
5255         iov[0].iov_len = total_len;
5256
5257         memset(&rqst, 0, sizeof(struct smb_rqst));
5258         rqst.rq_iov = iov;
5259         rqst.rq_nvec = 1;
5260
5261         rc = cifs_send_recv(xid, ses, server,
5262                             &rqst, &resp_buf_type, flags, &rsp_iov);
5263         cifs_small_buf_release(req);
5264
5265         if (rc) {
5266                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5267                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5268         }
5269
5270         return rc;
5271 }
5272
5273 void
5274 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5275                              struct kstatfs *kst)
5276 {
5277         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5278                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5279         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5280         kst->f_bfree  = kst->f_bavail =
5281                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5282         return;
5283 }
5284
5285 static void
5286 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5287                         struct kstatfs *kst)
5288 {
5289         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5290         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5291         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5292         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5293                 kst->f_bavail = kst->f_bfree;
5294         else
5295                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5296         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5297                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5298         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5299                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5300
5301         return;
5302 }
5303
5304 static int
5305 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5306                    struct TCP_Server_Info *server,
5307                    int level, int outbuf_len, u64 persistent_fid,
5308                    u64 volatile_fid)
5309 {
5310         int rc;
5311         struct smb2_query_info_req *req;
5312         unsigned int total_len;
5313
5314         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5315
5316         if ((tcon->ses == NULL) || server == NULL)
5317                 return -EIO;
5318
5319         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5320                                  (void **) &req, &total_len);
5321         if (rc)
5322                 return rc;
5323
5324         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5325         req->FileInfoClass = level;
5326         req->PersistentFileId = persistent_fid;
5327         req->VolatileFileId = volatile_fid;
5328         /* 1 for pad */
5329         req->InputBufferOffset =
5330                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5331         req->OutputBufferLength = cpu_to_le32(
5332                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5333
5334         iov->iov_base = (char *)req;
5335         iov->iov_len = total_len;
5336         return 0;
5337 }
5338
5339 int
5340 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5341               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5342 {
5343         struct smb_rqst rqst;
5344         struct smb2_query_info_rsp *rsp = NULL;
5345         struct kvec iov;
5346         struct kvec rsp_iov;
5347         int rc = 0;
5348         int resp_buftype;
5349         struct cifs_ses *ses = tcon->ses;
5350         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5351         FILE_SYSTEM_POSIX_INFO *info = NULL;
5352         int flags = 0;
5353
5354         rc = build_qfs_info_req(&iov, tcon, server,
5355                                 FS_POSIX_INFORMATION,
5356                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5357                                 persistent_fid, volatile_fid);
5358         if (rc)
5359                 return rc;
5360
5361         if (smb3_encryption_required(tcon))
5362                 flags |= CIFS_TRANSFORM_REQ;
5363
5364         memset(&rqst, 0, sizeof(struct smb_rqst));
5365         rqst.rq_iov = &iov;
5366         rqst.rq_nvec = 1;
5367
5368         rc = cifs_send_recv(xid, ses, server,
5369                             &rqst, &resp_buftype, flags, &rsp_iov);
5370         cifs_small_buf_release(iov.iov_base);
5371         if (rc) {
5372                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5373                 goto posix_qfsinf_exit;
5374         }
5375         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5376
5377         info = (FILE_SYSTEM_POSIX_INFO *)(
5378                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5379         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5380                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5381                                sizeof(FILE_SYSTEM_POSIX_INFO));
5382         if (!rc)
5383                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5384
5385 posix_qfsinf_exit:
5386         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5387         return rc;
5388 }
5389
5390 int
5391 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5392               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5393 {
5394         struct smb_rqst rqst;
5395         struct smb2_query_info_rsp *rsp = NULL;
5396         struct kvec iov;
5397         struct kvec rsp_iov;
5398         int rc = 0;
5399         int resp_buftype;
5400         struct cifs_ses *ses = tcon->ses;
5401         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5402         struct smb2_fs_full_size_info *info = NULL;
5403         int flags = 0;
5404
5405         rc = build_qfs_info_req(&iov, tcon, server,
5406                                 FS_FULL_SIZE_INFORMATION,
5407                                 sizeof(struct smb2_fs_full_size_info),
5408                                 persistent_fid, volatile_fid);
5409         if (rc)
5410                 return rc;
5411
5412         if (smb3_encryption_required(tcon))
5413                 flags |= CIFS_TRANSFORM_REQ;
5414
5415         memset(&rqst, 0, sizeof(struct smb_rqst));
5416         rqst.rq_iov = &iov;
5417         rqst.rq_nvec = 1;
5418
5419         rc = cifs_send_recv(xid, ses, server,
5420                             &rqst, &resp_buftype, flags, &rsp_iov);
5421         cifs_small_buf_release(iov.iov_base);
5422         if (rc) {
5423                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5424                 goto qfsinf_exit;
5425         }
5426         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5427
5428         info = (struct smb2_fs_full_size_info *)(
5429                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5430         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5431                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5432                                sizeof(struct smb2_fs_full_size_info));
5433         if (!rc)
5434                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5435
5436 qfsinf_exit:
5437         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5438         return rc;
5439 }
5440
5441 int
5442 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5443               u64 persistent_fid, u64 volatile_fid, int level)
5444 {
5445         struct smb_rqst rqst;
5446         struct smb2_query_info_rsp *rsp = NULL;
5447         struct kvec iov;
5448         struct kvec rsp_iov;
5449         int rc = 0;
5450         int resp_buftype, max_len, min_len;
5451         struct cifs_ses *ses = tcon->ses;
5452         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5453         unsigned int rsp_len, offset;
5454         int flags = 0;
5455
5456         if (level == FS_DEVICE_INFORMATION) {
5457                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5458                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5459         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5460                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5461                 min_len = MIN_FS_ATTR_INFO_SIZE;
5462         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5463                 max_len = sizeof(struct smb3_fs_ss_info);
5464                 min_len = sizeof(struct smb3_fs_ss_info);
5465         } else if (level == FS_VOLUME_INFORMATION) {
5466                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5467                 min_len = sizeof(struct smb3_fs_vol_info);
5468         } else {
5469                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5470                 return -EINVAL;
5471         }
5472
5473         rc = build_qfs_info_req(&iov, tcon, server,
5474                                 level, max_len,
5475                                 persistent_fid, volatile_fid);
5476         if (rc)
5477                 return rc;
5478
5479         if (smb3_encryption_required(tcon))
5480                 flags |= CIFS_TRANSFORM_REQ;
5481
5482         memset(&rqst, 0, sizeof(struct smb_rqst));
5483         rqst.rq_iov = &iov;
5484         rqst.rq_nvec = 1;
5485
5486         rc = cifs_send_recv(xid, ses, server,
5487                             &rqst, &resp_buftype, flags, &rsp_iov);
5488         cifs_small_buf_release(iov.iov_base);
5489         if (rc) {
5490                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5491                 goto qfsattr_exit;
5492         }
5493         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5494
5495         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5496         offset = le16_to_cpu(rsp->OutputBufferOffset);
5497         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5498         if (rc)
5499                 goto qfsattr_exit;
5500
5501         if (level == FS_ATTRIBUTE_INFORMATION)
5502                 memcpy(&tcon->fsAttrInfo, offset
5503                         + (char *)rsp, min_t(unsigned int,
5504                         rsp_len, max_len));
5505         else if (level == FS_DEVICE_INFORMATION)
5506                 memcpy(&tcon->fsDevInfo, offset
5507                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5508         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5509                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5510                         (offset + (char *)rsp);
5511                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5512                 tcon->perf_sector_size =
5513                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5514         } else if (level == FS_VOLUME_INFORMATION) {
5515                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5516                         (offset + (char *)rsp);
5517                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5518                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5519         }
5520
5521 qfsattr_exit:
5522         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5523         return rc;
5524 }
5525
5526 int
5527 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5528            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5529            const __u32 num_lock, struct smb2_lock_element *buf)
5530 {
5531         struct smb_rqst rqst;
5532         int rc = 0;
5533         struct smb2_lock_req *req = NULL;
5534         struct kvec iov[2];
5535         struct kvec rsp_iov;
5536         int resp_buf_type;
5537         unsigned int count;
5538         int flags = CIFS_NO_RSP_BUF;
5539         unsigned int total_len;
5540         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5541
5542         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5543
5544         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5545                                  (void **) &req, &total_len);
5546         if (rc)
5547                 return rc;
5548
5549         if (smb3_encryption_required(tcon))
5550                 flags |= CIFS_TRANSFORM_REQ;
5551
5552         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5553         req->LockCount = cpu_to_le16(num_lock);
5554
5555         req->PersistentFileId = persist_fid;
5556         req->VolatileFileId = volatile_fid;
5557
5558         count = num_lock * sizeof(struct smb2_lock_element);
5559
5560         iov[0].iov_base = (char *)req;
5561         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5562         iov[1].iov_base = (char *)buf;
5563         iov[1].iov_len = count;
5564
5565         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5566
5567         memset(&rqst, 0, sizeof(struct smb_rqst));
5568         rqst.rq_iov = iov;
5569         rqst.rq_nvec = 2;
5570
5571         rc = cifs_send_recv(xid, tcon->ses, server,
5572                             &rqst, &resp_buf_type, flags,
5573                             &rsp_iov);
5574         cifs_small_buf_release(req);
5575         if (rc) {
5576                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5577                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5578                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5579                                     tcon->ses->Suid, rc);
5580         }
5581
5582         return rc;
5583 }
5584
5585 int
5586 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5587           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5588           const __u64 length, const __u64 offset, const __u32 lock_flags,
5589           const bool wait)
5590 {
5591         struct smb2_lock_element lock;
5592
5593         lock.Offset = cpu_to_le64(offset);
5594         lock.Length = cpu_to_le64(length);
5595         lock.Flags = cpu_to_le32(lock_flags);
5596         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5597                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5598
5599         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5600 }
5601
5602 int
5603 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5604                  __u8 *lease_key, const __le32 lease_state)
5605 {
5606         struct smb_rqst rqst;
5607         int rc;
5608         struct smb2_lease_ack *req = NULL;
5609         struct cifs_ses *ses = tcon->ses;
5610         int flags = CIFS_OBREAK_OP;
5611         unsigned int total_len;
5612         struct kvec iov[1];
5613         struct kvec rsp_iov;
5614         int resp_buf_type;
5615         __u64 *please_key_high;
5616         __u64 *please_key_low;
5617         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5618
5619         cifs_dbg(FYI, "SMB2_lease_break\n");
5620         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5621                                  (void **) &req, &total_len);
5622         if (rc)
5623                 return rc;
5624
5625         if (smb3_encryption_required(tcon))
5626                 flags |= CIFS_TRANSFORM_REQ;
5627
5628         req->hdr.CreditRequest = cpu_to_le16(1);
5629         req->StructureSize = cpu_to_le16(36);
5630         total_len += 12;
5631
5632         memcpy(req->LeaseKey, lease_key, 16);
5633         req->LeaseState = lease_state;
5634
5635         flags |= CIFS_NO_RSP_BUF;
5636
5637         iov[0].iov_base = (char *)req;
5638         iov[0].iov_len = total_len;
5639
5640         memset(&rqst, 0, sizeof(struct smb_rqst));
5641         rqst.rq_iov = iov;
5642         rqst.rq_nvec = 1;
5643
5644         rc = cifs_send_recv(xid, ses, server,
5645                             &rqst, &resp_buf_type, flags, &rsp_iov);
5646         cifs_small_buf_release(req);
5647
5648         please_key_low = (__u64 *)lease_key;
5649         please_key_high = (__u64 *)(lease_key+8);
5650         if (rc) {
5651                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5652                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5653                         ses->Suid, *please_key_low, *please_key_high, rc);
5654                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5655         } else
5656                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5657                         ses->Suid, *please_key_low, *please_key_high);
5658
5659         return rc;
5660 }