fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   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  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53
  54 /*
  55  *  The following table defines the expected "StructureSize" of SMB2 requests
  56  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  57  *
  58  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  59  *  indexed by command in host byte order.
  60  */
  61 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  62         /* SMB2_NEGOTIATE */ 36,
  63         /* SMB2_SESSION_SETUP */ 25,
  64         /* SMB2_LOGOFF */ 4,
  65         /* SMB2_TREE_CONNECT */ 9,
  66         /* SMB2_TREE_DISCONNECT */ 4,
  67         /* SMB2_CREATE */ 57,
  68         /* SMB2_CLOSE */ 24,
  69         /* SMB2_FLUSH */ 24,
  70         /* SMB2_READ */ 49,
  71         /* SMB2_WRITE */ 49,
  72         /* SMB2_LOCK */ 48,
  73         /* SMB2_IOCTL */ 57,
  74         /* SMB2_CANCEL */ 4,
  75         /* SMB2_ECHO */ 4,
  76         /* SMB2_QUERY_DIRECTORY */ 33,
  77         /* SMB2_CHANGE_NOTIFY */ 32,
  78         /* SMB2_QUERY_INFO */ 41,
  79         /* SMB2_SET_INFO */ 33,
  80         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  81 };
  82
  83 int smb3_encryption_required(const struct cifs_tcon *tcon)
  84 {
  85         if (!tcon)
  86                 return 0;
  87         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  88             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  89                 return 1;
  90         if (tcon->seal &&
  91             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  92                 return 1;
  93         return 0;
  94 }
  95
  96 static void
  97 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  98                   const struct cifs_tcon *tcon)
  99 {
 100         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 101         shdr->StructureSize = cpu_to_le16(64);
 102         shdr->Command = smb2_cmd;
 103         if (tcon && tcon->ses && tcon->ses->server) {
 104                 struct TCP_Server_Info *server = tcon->ses->server;
 105
 106                 spin_lock(&server->req_lock);
 107                 /* Request up to 2 credits but don't go over the limit. */
 108                 if (server->credits >= server->max_credits)
 109                         shdr->CreditRequest = cpu_to_le16(0);
 110                 else
 111                         shdr->CreditRequest = cpu_to_le16(
 112                                 min_t(int, server->max_credits -
 113                                                 server->credits, 2));
 114                 spin_unlock(&server->req_lock);
 115         } else {
 116                 shdr->CreditRequest = cpu_to_le16(2);
 117         }
 118         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 119
 120         if (!tcon)
 121                 goto out;
 122
 123         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 124         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 125         if ((tcon->ses) && (tcon->ses->server) &&
 126             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 127                 shdr->CreditCharge = cpu_to_le16(1);
 128         /* else CreditCharge MBZ */
 129
 130         shdr->TreeId = tcon->tid;
 131         /* Uid is not converted */
 132         if (tcon->ses)
 133                 shdr->SessionId = tcon->ses->Suid;
 134
 135         /*
 136          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 137          * to pass the path on the Open SMB prefixed by \\server\share.
 138          * Not sure when we would need to do the augmented path (if ever) and
 139          * setting this flag breaks the SMB2 open operation since it is
 140          * illegal to send an empty path name (without \\server\share prefix)
 141          * when the DFS flag is set in the SMB open header. We could
 142          * consider setting the flag on all operations other than open
 143          * but it is safer to net set it for now.
 144          */
 145 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 146                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 147
 148         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 149             !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 157 {
 158         int rc;
 159         struct nls_table *nls_codepage;
 160         struct cifs_ses *ses;
 161         struct TCP_Server_Info *server;
 162
 163         /*
 164          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 165          * check for tcp and smb session status done differently
 166          * for those three - in the calling routine.
 167          */
 168         if (tcon == NULL)
 169                 return 0;
 170
 171         if (smb2_command == SMB2_TREE_CONNECT)
 172                 return 0;
 173
 174         if (tcon->tidStatus == CifsExiting) {
 175                 /*
 176                  * only tree disconnect, open, and write,
 177                  * (and ulogoff which does not have tcon)
 178                  * are allowed as we start force umount.
 179                  */
 180                 if ((smb2_command != SMB2_WRITE) &&
 181                    (smb2_command != SMB2_CREATE) &&
 182                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 183                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 184                                  smb2_command);
 185                         return -ENODEV;
 186                 }
 187         }
 188         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 189             (!tcon->ses->server))
 190                 return -EIO;
 191
 192         ses = tcon->ses;
 193         server = ses->server;
 194
 195         /*
 196          * Give demultiplex thread up to 10 seconds to reconnect, should be
 197          * greater than cifs socket timeout which is 7 seconds
 198          */
 199         while (server->tcpStatus == CifsNeedReconnect) {
 200                 /*
 201                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 202                  * here since they are implicitly done when session drops.
 203                  */
 204                 switch (smb2_command) {
 205                 /*
 206                  * BB Should we keep oplock break and add flush to exceptions?
 207                  */
 208                 case SMB2_TREE_DISCONNECT:
 209                 case SMB2_CANCEL:
 210                 case SMB2_CLOSE:
 211                 case SMB2_OPLOCK_BREAK:
 212                         return -EAGAIN;
 213                 }
 214
 215                 rc = wait_event_interruptible_timeout(server->response_q,
 216                                                       (server->tcpStatus != CifsNeedReconnect),
 217                                                       10 * HZ);
 218                 if (rc < 0) {
 219                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 220                                  " signal by the process\n", __func__);
 221                         return -ERESTARTSYS;
 222                 }
 223
 224                 /* are we still trying to reconnect? */
 225                 if (server->tcpStatus != CifsNeedReconnect)
 226                         break;
 227
 228                 /*
 229                  * on "soft" mounts we wait once. Hard mounts keep
 230                  * retrying until process is killed or server comes
 231                  * back on-line
 232                  */
 233                 if (!tcon->retry) {
 234                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 235                         return -EHOSTDOWN;
 236                 }
 237         }
 238
 239         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 240                 return 0;
 241
 242         nls_codepage = load_nls_default();
 243
 244         /*
 245          * need to prevent multiple threads trying to simultaneously reconnect
 246          * the same SMB session
 247          */
 248         mutex_lock(&tcon->ses->session_mutex);
 249
 250         /*
 251          * Recheck after acquire mutex. If another thread is negotiating
 252          * and the server never sends an answer the socket will be closed
 253          * and tcpStatus set to reconnect.
 254          */
 255         if (server->tcpStatus == CifsNeedReconnect) {
 256                 rc = -EHOSTDOWN;
 257                 mutex_unlock(&tcon->ses->session_mutex);
 258                 goto out;
 259         }
 260
 261         rc = cifs_negotiate_protocol(0, tcon->ses);
 262         if (!rc && tcon->ses->need_reconnect)
 263                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 264
 265         if (rc || !tcon->need_reconnect) {
 266                 mutex_unlock(&tcon->ses->session_mutex);
 267                 goto out;
 268         }
 269
 270         cifs_mark_open_files_invalid(tcon);
 271         if (tcon->use_persistent)
 272                 tcon->need_reopen_files = true;
 273
 274         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 275         mutex_unlock(&tcon->ses->session_mutex);
 276
 277         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 278         if (rc) {
 279                 /* If sess reconnected but tcon didn't, something strange ... */
 280                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 281                 goto out;
 282         }
 283
 284         if (smb2_command != SMB2_INTERNAL_CMD)
 285                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 286
 287         atomic_inc(&tconInfoReconnectCount);
 288 out:
 289         /*
 290          * Check if handle based operation so we know whether we can continue
 291          * or not without returning to caller to reset file handle.
 292          */
 293         /*
 294          * BB Is flush done by server on drop of tcp session? Should we special
 295          * case it and skip above?
 296          */
 297         switch (smb2_command) {
 298         case SMB2_FLUSH:
 299         case SMB2_READ:
 300         case SMB2_WRITE:
 301         case SMB2_LOCK:
 302         case SMB2_IOCTL:
 303         case SMB2_QUERY_DIRECTORY:
 304         case SMB2_CHANGE_NOTIFY:
 305         case SMB2_QUERY_INFO:
 306         case SMB2_SET_INFO:
 307                 rc = -EAGAIN;
 308         }
 309         unload_nls(nls_codepage);
 310         return rc;
 311 }
 312
 313 static void
 314 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 315                unsigned int *total_len)
 316 {
 317         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 318         /* lookup word count ie StructureSize from table */
 319         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 320
 321         /*
 322          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 323          * largest operations (Create)
 324          */
 325         memset(buf, 0, 256);
 326
 327         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 328         spdu->StructureSize2 = cpu_to_le16(parmsize);
 329
 330         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 331 }
 332
 333 /*
 334  * Allocate and return pointer to an SMB request hdr, and set basic
 335  * SMB information in the SMB header. If the return code is zero, this
 336  * function must have filled in request_buf pointer.
 337  */
 338 static int
 339 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 340                     void **request_buf, unsigned int *total_len)
 341 {
 342         int rc;
 343
 344         rc = smb2_reconnect(smb2_command, tcon);
 345         if (rc)
 346                 return rc;
 347
 348         /* BB eventually switch this to SMB2 specific small buf size */
 349         if (smb2_command == SMB2_SET_INFO)
 350                 *request_buf = cifs_buf_get();
 351         else
 352                 *request_buf = cifs_small_buf_get();
 353         if (*request_buf == NULL) {
 354                 /* BB should we add a retry in here if not a writepage? */
 355                 return -ENOMEM;
 356         }
 357
 358         fill_small_buf(smb2_command, tcon,
 359                        (struct smb2_sync_hdr *)(*request_buf),
 360                        total_len);
 361
 362         if (tcon != NULL) {
 363                 uint16_t com_code = le16_to_cpu(smb2_command);
 364                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 365                 cifs_stats_inc(&tcon->num_smbs_sent);
 366         }
 367
 368         return rc;
 369 }
 370
 371
 372 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 373 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 374
 375
 376 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 377 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 378 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 379
 380 static void
 381 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 382 {
 383         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 384         pneg_ctxt->DataLength = cpu_to_le16(38);
 385         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 386         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 387         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 388         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 389 }
 390
 391 static void
 392 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 393 {
 394         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 395         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 396         pneg_ctxt->CipherCount = cpu_to_le16(1);
 397 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 398         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 399 }
 400
 401 static void
 402 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 403 {
 404         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 405         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 406 }
 407
 408 static void
 409 assemble_neg_contexts(struct smb2_negotiate_req *req,
 410                       unsigned int *total_len)
 411 {
 412         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 413         unsigned int ctxt_len;
 414
 415         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 416         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 417         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 418         *total_len += ctxt_len;
 419         pneg_ctxt += ctxt_len;
 420
 421         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 422         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 423         *total_len += ctxt_len;
 424         pneg_ctxt += ctxt_len;
 425
 426         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 427         *total_len += sizeof(struct smb2_posix_neg_context);
 428
 429         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 430         req->NegotiateContextCount = cpu_to_le16(3);
 431 }
 432
 433 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 434 {
 435         unsigned int len = le16_to_cpu(ctxt->DataLength);
 436
 437         /* If invalid preauth context warn but use what we requested, SHA-512 */
 438         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 439                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 440                 return;
 441         }
 442         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 443                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 444         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 445                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 446 }
 447
 448 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 449                               struct smb2_encryption_neg_context *ctxt)
 450 {
 451         unsigned int len = le16_to_cpu(ctxt->DataLength);
 452
 453         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 454         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 455                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 456                 return -EINVAL;
 457         }
 458
 459         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 460                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 461                 return -EINVAL;
 462         }
 463         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 464         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 465             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 466                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 467                 return -EINVAL;
 468         }
 469         server->cipher_type = ctxt->Ciphers[0];
 470         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 471         return 0;
 472 }
 473
 474 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 475                                      struct TCP_Server_Info *server,
 476                                      unsigned int len_of_smb)
 477 {
 478         struct smb2_neg_context *pctx;
 479         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 480         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 481         unsigned int len_of_ctxts, i;
 482         int rc = 0;
 483
 484         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 485         if (len_of_smb <= offset) {
 486                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 487                 return -EINVAL;
 488         }
 489
 490         len_of_ctxts = len_of_smb - offset;
 491
 492         for (i = 0; i < ctxt_cnt; i++) {
 493                 int clen;
 494                 /* check that offset is not beyond end of SMB */
 495                 if (len_of_ctxts == 0)
 496                         break;
 497
 498                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 499                         break;
 500
 501                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 502                 clen = le16_to_cpu(pctx->DataLength);
 503                 if (clen > len_of_ctxts)
 504                         break;
 505
 506                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 507                         decode_preauth_context(
 508                                 (struct smb2_preauth_neg_context *)pctx);
 509                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 510                         rc = decode_encrypt_ctx(server,
 511                                 (struct smb2_encryption_neg_context *)pctx);
 512                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 513                         server->posix_ext_supported = true;
 514                 else
 515                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 516                                 le16_to_cpu(pctx->ContextType));
 517
 518                 if (rc)
 519                         break;
 520                 /* offsets must be 8 byte aligned */
 521                 clen = (clen + 7) & ~0x7;
 522                 offset += clen + sizeof(struct smb2_neg_context);
 523                 len_of_ctxts -= clen;
 524         }
 525         return rc;
 526 }
 527
 528 static struct create_posix *
 529 create_posix_buf(umode_t mode)
 530 {
 531         struct create_posix *buf;
 532
 533         buf = kzalloc(sizeof(struct create_posix),
 534                         GFP_KERNEL);
 535         if (!buf)
 536                 return NULL;
 537
 538         buf->ccontext.DataOffset =
 539                 cpu_to_le16(offsetof(struct create_posix, Mode));
 540         buf->ccontext.DataLength = cpu_to_le32(4);
 541         buf->ccontext.NameOffset =
 542                 cpu_to_le16(offsetof(struct create_posix, Name));
 543         buf->ccontext.NameLength = cpu_to_le16(16);
 544
 545         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 546         buf->Name[0] = 0x93;
 547         buf->Name[1] = 0xAD;
 548         buf->Name[2] = 0x25;
 549         buf->Name[3] = 0x50;
 550         buf->Name[4] = 0x9C;
 551         buf->Name[5] = 0xB4;
 552         buf->Name[6] = 0x11;
 553         buf->Name[7] = 0xE7;
 554         buf->Name[8] = 0xB4;
 555         buf->Name[9] = 0x23;
 556         buf->Name[10] = 0x83;
 557         buf->Name[11] = 0xDE;
 558         buf->Name[12] = 0x96;
 559         buf->Name[13] = 0x8B;
 560         buf->Name[14] = 0xCD;
 561         buf->Name[15] = 0x7C;
 562         buf->Mode = cpu_to_le32(mode);
 563         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 564         return buf;
 565 }
 566
 567 static int
 568 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 569 {
 570         struct smb2_create_req *req = iov[0].iov_base;
 571         unsigned int num = *num_iovec;
 572
 573         iov[num].iov_base = create_posix_buf(mode);
 574         if (iov[num].iov_base == NULL)
 575                 return -ENOMEM;
 576         iov[num].iov_len = sizeof(struct create_posix);
 577         if (!req->CreateContextsOffset)
 578                 req->CreateContextsOffset = cpu_to_le32(
 579                                 sizeof(struct smb2_create_req) +
 580                                 iov[num - 1].iov_len);
 581         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 582         *num_iovec = num + 1;
 583         return 0;
 584 }
 585
 586
 587 /*
 588  *
 589  *      SMB2 Worker functions follow:
 590  *
 591  *      The general structure of the worker functions is:
 592  *      1) Call smb2_init (assembles SMB2 header)
 593  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 594  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 595  *      4) Decode SMB2 command specific fields in the fixed length area
 596  *      5) Decode variable length data area (if any for this SMB2 command type)
 597  *      6) Call free smb buffer
 598  *      7) return
 599  *
 600  */
 601
 602 int
 603 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 604 {
 605         struct smb_rqst rqst;
 606         struct smb2_negotiate_req *req;
 607         struct smb2_negotiate_rsp *rsp;
 608         struct kvec iov[1];
 609         struct kvec rsp_iov;
 610         int rc = 0;
 611         int resp_buftype;
 612         struct TCP_Server_Info *server = ses->server;
 613         int blob_offset, blob_length;
 614         char *security_blob;
 615         int flags = CIFS_NEG_OP;
 616         unsigned int total_len;
 617
 618         cifs_dbg(FYI, "Negotiate protocol\n");
 619
 620         if (!server) {
 621                 WARN(1, "%s: server is NULL!\n", __func__);
 622                 return -EIO;
 623         }
 624
 625         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 626         if (rc)
 627                 return rc;
 628
 629         req->sync_hdr.SessionId = 0;
 630
 631         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 632         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 633
 634         if (strcmp(ses->server->vals->version_string,
 635                    SMB3ANY_VERSION_STRING) == 0) {
 636                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 637                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 638                 req->DialectCount = cpu_to_le16(2);
 639                 total_len += 4;
 640         } else if (strcmp(ses->server->vals->version_string,
 641                    SMBDEFAULT_VERSION_STRING) == 0) {
 642                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 643                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 644                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 645                 req->DialectCount = cpu_to_le16(3);
 646                 total_len += 6;
 647         } else {
 648                 /* otherwise send specific dialect */
 649                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 650                 req->DialectCount = cpu_to_le16(1);
 651                 total_len += 2;
 652         }
 653
 654         /* only one of SMB2 signing flags may be set in SMB2 request */
 655         if (ses->sign)
 656                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 657         else if (global_secflags & CIFSSEC_MAY_SIGN)
 658                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 659         else
 660                 req->SecurityMode = 0;
 661
 662         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 663
 664         /* ClientGUID must be zero for SMB2.02 dialect */
 665         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 666                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 667         else {
 668                 memcpy(req->ClientGUID, server->client_guid,
 669                         SMB2_CLIENT_GUID_SIZE);
 670                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 671                         assemble_neg_contexts(req, &total_len);
 672         }
 673         iov[0].iov_base = (char *)req;
 674         iov[0].iov_len = total_len;
 675
 676         memset(&rqst, 0, sizeof(struct smb_rqst));
 677         rqst.rq_iov = iov;
 678         rqst.rq_nvec = 1;
 679
 680         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 681         cifs_small_buf_release(req);
 682         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 683         /*
 684          * No tcon so can't do
 685          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 686          */
 687         if (rc == -EOPNOTSUPP) {
 688                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 689                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 690                         " older servers\n");
 691                 goto neg_exit;
 692         } else if (rc != 0)
 693                 goto neg_exit;
 694
 695         if (strcmp(ses->server->vals->version_string,
 696                    SMB3ANY_VERSION_STRING) == 0) {
 697                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 698                         cifs_dbg(VFS,
 699                                 "SMB2 dialect returned but not requested\n");
 700                         return -EIO;
 701                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 702                         cifs_dbg(VFS,
 703                                 "SMB2.1 dialect returned but not requested\n");
 704                         return -EIO;
 705                 }
 706         } else if (strcmp(ses->server->vals->version_string,
 707                    SMBDEFAULT_VERSION_STRING) == 0) {
 708                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 709                         cifs_dbg(VFS,
 710                                 "SMB2 dialect returned but not requested\n");
 711                         return -EIO;
 712                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 713                         /* ops set to 3.0 by default for default so update */
 714                         ses->server->ops = &smb21_operations;
 715                 }
 716         } else if (le16_to_cpu(rsp->DialectRevision) !=
 717                                 ses->server->vals->protocol_id) {
 718                 /* if requested single dialect ensure returned dialect matched */
 719                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 720                         le16_to_cpu(rsp->DialectRevision));
 721                 return -EIO;
 722         }
 723
 724         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 725
 726         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 727                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 728         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 729                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 730         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 731                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 732         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 733                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 734         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 735                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 736         else {
 737                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 738                          le16_to_cpu(rsp->DialectRevision));
 739                 rc = -EIO;
 740                 goto neg_exit;
 741         }
 742         server->dialect = le16_to_cpu(rsp->DialectRevision);
 743
 744         /*
 745          * Keep a copy of the hash after negprot. This hash will be
 746          * the starting hash value for all sessions made from this
 747          * server.
 748          */
 749         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 750                SMB2_PREAUTH_HASH_SIZE);
 751
 752         /* SMB2 only has an extended negflavor */
 753         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 754         /* set it to the maximum buffer size value we can send with 1 credit */
 755         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 756                                SMB2_MAX_BUFFER_SIZE);
 757         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 758         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 759         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 760         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 761                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 762                                 server->sec_mode);
 763         server->capabilities = le32_to_cpu(rsp->Capabilities);
 764         /* Internal types */
 765         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 766
 767         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 768                                                (struct smb2_sync_hdr *)rsp);
 769         /*
 770          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 771          * for us will be
 772          *      ses->sectype = RawNTLMSSP;
 773          * but for time being this is our only auth choice so doesn't matter.
 774          * We just found a server which sets blob length to zero expecting raw.
 775          */
 776         if (blob_length == 0) {
 777                 cifs_dbg(FYI, "missing security blob on negprot\n");
 778                 server->sec_ntlmssp = true;
 779         }
 780
 781         rc = cifs_enable_signing(server, ses->sign);
 782         if (rc)
 783                 goto neg_exit;
 784         if (blob_length) {
 785                 rc = decode_negTokenInit(security_blob, blob_length, server);
 786                 if (rc == 1)
 787                         rc = 0;
 788                 else if (rc == 0)
 789                         rc = -EIO;
 790         }
 791
 792         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 793                 if (rsp->NegotiateContextCount)
 794                         rc = smb311_decode_neg_context(rsp, server,
 795                                                        rsp_iov.iov_len);
 796                 else
 797                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 798         }
 799 neg_exit:
 800         free_rsp_buf(resp_buftype, rsp);
 801         return rc;
 802 }
 803
 804 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 805 {
 806         int rc;
 807         struct validate_negotiate_info_req *pneg_inbuf;
 808         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 809         u32 rsplen;
 810         u32 inbuflen; /* max of 4 dialects */
 811
 812         cifs_dbg(FYI, "validate negotiate\n");
 813
 814         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 815         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 816                 return 0;
 817
 818         /*
 819          * validation ioctl must be signed, so no point sending this if we
 820          * can not sign it (ie are not known user).  Even if signing is not
 821          * required (enabled but not negotiated), in those cases we selectively
 822          * sign just this, the first and only signed request on a connection.
 823          * Having validation of negotiate info  helps reduce attack vectors.
 824          */
 825         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 826                 return 0; /* validation requires signing */
 827
 828         if (tcon->ses->user_name == NULL) {
 829                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 830                 return 0; /* validation requires signing */
 831         }
 832
 833         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 834                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 835
 836         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 837         if (!pneg_inbuf)
 838                 return -ENOMEM;
 839
 840         pneg_inbuf->Capabilities =
 841                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 842         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 843                                         SMB2_CLIENT_GUID_SIZE);
 844
 845         if (tcon->ses->sign)
 846                 pneg_inbuf->SecurityMode =
 847                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 848         else if (global_secflags & CIFSSEC_MAY_SIGN)
 849                 pneg_inbuf->SecurityMode =
 850                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 851         else
 852                 pneg_inbuf->SecurityMode = 0;
 853
 854
 855         if (strcmp(tcon->ses->server->vals->version_string,
 856                 SMB3ANY_VERSION_STRING) == 0) {
 857                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 858                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 859                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 860                 /* structure is big enough for 3 dialects, sending only 2 */
 861                 inbuflen = sizeof(*pneg_inbuf) -
 862                                 sizeof(pneg_inbuf->Dialects[0]);
 863         } else if (strcmp(tcon->ses->server->vals->version_string,
 864                 SMBDEFAULT_VERSION_STRING) == 0) {
 865                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 866                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 867                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 868                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 869                 /* structure is big enough for 3 dialects */
 870                 inbuflen = sizeof(*pneg_inbuf);
 871         } else {
 872                 /* otherwise specific dialect was requested */
 873                 pneg_inbuf->Dialects[0] =
 874                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 875                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 876                 /* structure is big enough for 3 dialects, sending only 1 */
 877                 inbuflen = sizeof(*pneg_inbuf) -
 878                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 879         }
 880
 881         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 882                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 883                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 884
 885         if (rc != 0) {
 886                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 887                 rc = -EIO;
 888                 goto out_free_inbuf;
 889         }
 890
 891         rc = -EIO;
 892         if (rsplen != sizeof(*pneg_rsp)) {
 893                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 894                          rsplen);
 895
 896                 /* relax check since Mac returns max bufsize allowed on ioctl */
 897                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 898                         goto out_free_rsp;
 899         }
 900
 901         /* check validate negotiate info response matches what we got earlier */
 902         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 903                 goto vneg_out;
 904
 905         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 906                 goto vneg_out;
 907
 908         /* do not validate server guid because not saved at negprot time yet */
 909
 910         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 911               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 912                 goto vneg_out;
 913
 914         /* validate negotiate successful */
 915         rc = 0;
 916         cifs_dbg(FYI, "validate negotiate info successful\n");
 917         goto out_free_rsp;
 918
 919 vneg_out:
 920         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 921 out_free_rsp:
 922         kfree(pneg_rsp);
 923 out_free_inbuf:
 924         kfree(pneg_inbuf);
 925         return rc;
 926 }
 927
 928 enum securityEnum
 929 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 930 {
 931         switch (requested) {
 932         case Kerberos:
 933         case RawNTLMSSP:
 934                 return requested;
 935         case NTLMv2:
 936                 return RawNTLMSSP;
 937         case Unspecified:
 938                 if (server->sec_ntlmssp &&
 939                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 940                         return RawNTLMSSP;
 941                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 942                         (global_secflags & CIFSSEC_MAY_KRB5))
 943                         return Kerberos;
 944                 /* Fallthrough */
 945         default:
 946                 return Unspecified;
 947         }
 948 }
 949
 950 struct SMB2_sess_data {
 951         unsigned int xid;
 952         struct cifs_ses *ses;
 953         struct nls_table *nls_cp;
 954         void (*func)(struct SMB2_sess_data *);
 955         int result;
 956         u64 previous_session;
 957
 958         /* we will send the SMB in three pieces:
 959          * a fixed length beginning part, an optional
 960          * SPNEGO blob (which can be zero length), and a
 961          * last part which will include the strings
 962          * and rest of bcc area. This allows us to avoid
 963          * a large buffer 17K allocation
 964          */
 965         int buf0_type;
 966         struct kvec iov[2];
 967 };
 968
 969 static int
 970 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 971 {
 972         int rc;
 973         struct cifs_ses *ses = sess_data->ses;
 974         struct smb2_sess_setup_req *req;
 975         struct TCP_Server_Info *server = ses->server;
 976         unsigned int total_len;
 977
 978         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 979                              &total_len);
 980         if (rc)
 981                 return rc;
 982
 983         /* First session, not a reauthenticate */
 984         req->sync_hdr.SessionId = 0;
 985
 986         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 987         req->PreviousSessionId = sess_data->previous_session;
 988
 989         req->Flags = 0; /* MBZ */
 990
 991         /* enough to enable echos and oplocks and one max size write */
 992         req->sync_hdr.CreditRequest = cpu_to_le16(130);
 993
 994         /* only one of SMB2 signing flags may be set in SMB2 request */
 995         if (server->sign)
 996                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 997         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 998                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 999         else
1000                 req->SecurityMode = 0;
1001
1002         req->Capabilities = 0;
1003         req->Channel = 0; /* MBZ */
1004
1005         sess_data->iov[0].iov_base = (char *)req;
1006         /* 1 for pad */
1007         sess_data->iov[0].iov_len = total_len - 1;
1008         /*
1009          * This variable will be used to clear the buffer
1010          * allocated above in case of any error in the calling function.
1011          */
1012         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1013
1014         return 0;
1015 }
1016
1017 static void
1018 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1019 {
1020         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1021         sess_data->buf0_type = CIFS_NO_BUFFER;
1022 }
1023
1024 static int
1025 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1026 {
1027         int rc;
1028         struct smb_rqst rqst;
1029         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1030         struct kvec rsp_iov = { NULL, 0 };
1031
1032         /* Testing shows that buffer offset must be at location of Buffer[0] */
1033         req->SecurityBufferOffset =
1034                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1035         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1036
1037         memset(&rqst, 0, sizeof(struct smb_rqst));
1038         rqst.rq_iov = sess_data->iov;
1039         rqst.rq_nvec = 2;
1040
1041         /* BB add code to build os and lm fields */
1042         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1043                             &rqst,
1044                             &sess_data->buf0_type,
1045                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1046         cifs_small_buf_release(sess_data->iov[0].iov_base);
1047         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1048
1049         return rc;
1050 }
1051
1052 static int
1053 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1054 {
1055         int rc = 0;
1056         struct cifs_ses *ses = sess_data->ses;
1057
1058         mutex_lock(&ses->server->srv_mutex);
1059         if (ses->server->ops->generate_signingkey) {
1060                 rc = ses->server->ops->generate_signingkey(ses);
1061                 if (rc) {
1062                         cifs_dbg(FYI,
1063                                 "SMB3 session key generation failed\n");
1064                         mutex_unlock(&ses->server->srv_mutex);
1065                         return rc;
1066                 }
1067         }
1068         if (!ses->server->session_estab) {
1069                 ses->server->sequence_number = 0x2;
1070                 ses->server->session_estab = true;
1071         }
1072         mutex_unlock(&ses->server->srv_mutex);
1073
1074         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1075         spin_lock(&GlobalMid_Lock);
1076         ses->status = CifsGood;
1077         ses->need_reconnect = false;
1078         spin_unlock(&GlobalMid_Lock);
1079         return rc;
1080 }
1081
1082 #ifdef CONFIG_CIFS_UPCALL
1083 static void
1084 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1085 {
1086         int rc;
1087         struct cifs_ses *ses = sess_data->ses;
1088         struct cifs_spnego_msg *msg;
1089         struct key *spnego_key = NULL;
1090         struct smb2_sess_setup_rsp *rsp = NULL;
1091
1092         rc = SMB2_sess_alloc_buffer(sess_data);
1093         if (rc)
1094                 goto out;
1095
1096         spnego_key = cifs_get_spnego_key(ses);
1097         if (IS_ERR(spnego_key)) {
1098                 rc = PTR_ERR(spnego_key);
1099                 spnego_key = NULL;
1100                 goto out;
1101         }
1102
1103         msg = spnego_key->payload.data[0];
1104         /*
1105          * check version field to make sure that cifs.upcall is
1106          * sending us a response in an expected form
1107          */
1108         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1109                 cifs_dbg(VFS,
1110                           "bad cifs.upcall version. Expected %d got %d",
1111                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1112                 rc = -EKEYREJECTED;
1113                 goto out_put_spnego_key;
1114         }
1115
1116         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1117                                          GFP_KERNEL);
1118         if (!ses->auth_key.response) {
1119                 cifs_dbg(VFS,
1120                         "Kerberos can't allocate (%u bytes) memory",
1121                         msg->sesskey_len);
1122                 rc = -ENOMEM;
1123                 goto out_put_spnego_key;
1124         }
1125         ses->auth_key.len = msg->sesskey_len;
1126
1127         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1128         sess_data->iov[1].iov_len = msg->secblob_len;
1129
1130         rc = SMB2_sess_sendreceive(sess_data);
1131         if (rc)
1132                 goto out_put_spnego_key;
1133
1134         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1135         ses->Suid = rsp->sync_hdr.SessionId;
1136
1137         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1138
1139         rc = SMB2_sess_establish_session(sess_data);
1140 out_put_spnego_key:
1141         key_invalidate(spnego_key);
1142         key_put(spnego_key);
1143 out:
1144         sess_data->result = rc;
1145         sess_data->func = NULL;
1146         SMB2_sess_free_buffer(sess_data);
1147 }
1148 #else
1149 static void
1150 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1151 {
1152         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1153         sess_data->result = -EOPNOTSUPP;
1154         sess_data->func = NULL;
1155 }
1156 #endif
1157
1158 static void
1159 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1160
1161 static void
1162 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1163 {
1164         int rc;
1165         struct cifs_ses *ses = sess_data->ses;
1166         struct smb2_sess_setup_rsp *rsp = NULL;
1167         char *ntlmssp_blob = NULL;
1168         bool use_spnego = false; /* else use raw ntlmssp */
1169         u16 blob_length = 0;
1170
1171         /*
1172          * If memory allocation is successful, caller of this function
1173          * frees it.
1174          */
1175         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1176         if (!ses->ntlmssp) {
1177                 rc = -ENOMEM;
1178                 goto out_err;
1179         }
1180         ses->ntlmssp->sesskey_per_smbsess = true;
1181
1182         rc = SMB2_sess_alloc_buffer(sess_data);
1183         if (rc)
1184                 goto out_err;
1185
1186         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1187                                GFP_KERNEL);
1188         if (ntlmssp_blob == NULL) {
1189                 rc = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1194         if (use_spnego) {
1195                 /* BB eventually need to add this */
1196                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1197                 rc = -EOPNOTSUPP;
1198                 goto out;
1199         } else {
1200                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1201                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1202         }
1203         sess_data->iov[1].iov_base = ntlmssp_blob;
1204         sess_data->iov[1].iov_len = blob_length;
1205
1206         rc = SMB2_sess_sendreceive(sess_data);
1207         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1208
1209         /* If true, rc here is expected and not an error */
1210         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1211                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1212                 rc = 0;
1213
1214         if (rc)
1215                 goto out;
1216
1217         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1218                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1219                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1220                         le16_to_cpu(rsp->SecurityBufferOffset));
1221                 rc = -EIO;
1222                 goto out;
1223         }
1224         rc = decode_ntlmssp_challenge(rsp->Buffer,
1225                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1226         if (rc)
1227                 goto out;
1228
1229         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1230
1231
1232         ses->Suid = rsp->sync_hdr.SessionId;
1233         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234
1235 out:
1236         kfree(ntlmssp_blob);
1237         SMB2_sess_free_buffer(sess_data);
1238         if (!rc) {
1239                 sess_data->result = 0;
1240                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1241                 return;
1242         }
1243 out_err:
1244         kfree(ses->ntlmssp);
1245         ses->ntlmssp = NULL;
1246         sess_data->result = rc;
1247         sess_data->func = NULL;
1248 }
1249
1250 static void
1251 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1252 {
1253         int rc;
1254         struct cifs_ses *ses = sess_data->ses;
1255         struct smb2_sess_setup_req *req;
1256         struct smb2_sess_setup_rsp *rsp = NULL;
1257         unsigned char *ntlmssp_blob = NULL;
1258         bool use_spnego = false; /* else use raw ntlmssp */
1259         u16 blob_length = 0;
1260
1261         rc = SMB2_sess_alloc_buffer(sess_data);
1262         if (rc)
1263                 goto out;
1264
1265         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1266         req->sync_hdr.SessionId = ses->Suid;
1267
1268         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1269                                         sess_data->nls_cp);
1270         if (rc) {
1271                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1272                 goto out;
1273         }
1274
1275         if (use_spnego) {
1276                 /* BB eventually need to add this */
1277                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1278                 rc = -EOPNOTSUPP;
1279                 goto out;
1280         }
1281         sess_data->iov[1].iov_base = ntlmssp_blob;
1282         sess_data->iov[1].iov_len = blob_length;
1283
1284         rc = SMB2_sess_sendreceive(sess_data);
1285         if (rc)
1286                 goto out;
1287
1288         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1289
1290         ses->Suid = rsp->sync_hdr.SessionId;
1291         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1292
1293         rc = SMB2_sess_establish_session(sess_data);
1294 out:
1295         kfree(ntlmssp_blob);
1296         SMB2_sess_free_buffer(sess_data);
1297         kfree(ses->ntlmssp);
1298         ses->ntlmssp = NULL;
1299         sess_data->result = rc;
1300         sess_data->func = NULL;
1301 }
1302
1303 static int
1304 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1305 {
1306         int type;
1307
1308         type = smb2_select_sectype(ses->server, ses->sectype);
1309         cifs_dbg(FYI, "sess setup type %d\n", type);
1310         if (type == Unspecified) {
1311                 cifs_dbg(VFS,
1312                         "Unable to select appropriate authentication method!");
1313                 return -EINVAL;
1314         }
1315
1316         switch (type) {
1317         case Kerberos:
1318                 sess_data->func = SMB2_auth_kerberos;
1319                 break;
1320         case RawNTLMSSP:
1321                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1322                 break;
1323         default:
1324                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1325                 return -EOPNOTSUPP;
1326         }
1327
1328         return 0;
1329 }
1330
1331 int
1332 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1333                 const struct nls_table *nls_cp)
1334 {
1335         int rc = 0;
1336         struct TCP_Server_Info *server = ses->server;
1337         struct SMB2_sess_data *sess_data;
1338
1339         cifs_dbg(FYI, "Session Setup\n");
1340
1341         if (!server) {
1342                 WARN(1, "%s: server is NULL!\n", __func__);
1343                 return -EIO;
1344         }
1345
1346         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1347         if (!sess_data)
1348                 return -ENOMEM;
1349
1350         rc = SMB2_select_sec(ses, sess_data);
1351         if (rc)
1352                 goto out;
1353         sess_data->xid = xid;
1354         sess_data->ses = ses;
1355         sess_data->buf0_type = CIFS_NO_BUFFER;
1356         sess_data->nls_cp = (struct nls_table *) nls_cp;
1357         sess_data->previous_session = ses->Suid;
1358
1359         /*
1360          * Initialize the session hash with the server one.
1361          */
1362         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1363                SMB2_PREAUTH_HASH_SIZE);
1364
1365         while (sess_data->func)
1366                 sess_data->func(sess_data);
1367
1368         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1369                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1370         rc = sess_data->result;
1371 out:
1372         kfree(sess_data);
1373         return rc;
1374 }
1375
1376 int
1377 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1378 {
1379         struct smb_rqst rqst;
1380         struct smb2_logoff_req *req; /* response is also trivial struct */
1381         int rc = 0;
1382         struct TCP_Server_Info *server;
1383         int flags = 0;
1384         unsigned int total_len;
1385         struct kvec iov[1];
1386         struct kvec rsp_iov;
1387         int resp_buf_type;
1388
1389         cifs_dbg(FYI, "disconnect session %p\n", ses);
1390
1391         if (ses && (ses->server))
1392                 server = ses->server;
1393         else
1394                 return -EIO;
1395
1396         /* no need to send SMB logoff if uid already closed due to reconnect */
1397         if (ses->need_reconnect)
1398                 goto smb2_session_already_dead;
1399
1400         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1401         if (rc)
1402                 return rc;
1403
1404          /* since no tcon, smb2_init can not do this, so do here */
1405         req->sync_hdr.SessionId = ses->Suid;
1406
1407         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1408                 flags |= CIFS_TRANSFORM_REQ;
1409         else if (server->sign)
1410                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1411
1412         flags |= CIFS_NO_RESP;
1413
1414         iov[0].iov_base = (char *)req;
1415         iov[0].iov_len = total_len;
1416
1417         memset(&rqst, 0, sizeof(struct smb_rqst));
1418         rqst.rq_iov = iov;
1419         rqst.rq_nvec = 1;
1420
1421         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1422         cifs_small_buf_release(req);
1423         /*
1424          * No tcon so can't do
1425          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1426          */
1427
1428 smb2_session_already_dead:
1429         return rc;
1430 }
1431
1432 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1433 {
1434         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1435 }
1436
1437 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1438
1439 /* These are similar values to what Windows uses */
1440 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1441 {
1442         tcon->max_chunks = 256;
1443         tcon->max_bytes_chunk = 1048576;
1444         tcon->max_bytes_copy = 16777216;
1445 }
1446
1447 int
1448 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1449           struct cifs_tcon *tcon, const struct nls_table *cp)
1450 {
1451         struct smb_rqst rqst;
1452         struct smb2_tree_connect_req *req;
1453         struct smb2_tree_connect_rsp *rsp = NULL;
1454         struct kvec iov[2];
1455         struct kvec rsp_iov = { NULL, 0 };
1456         int rc = 0;
1457         int resp_buftype;
1458         int unc_path_len;
1459         __le16 *unc_path = NULL;
1460         int flags = 0;
1461         unsigned int total_len;
1462
1463         cifs_dbg(FYI, "TCON\n");
1464
1465         if (!(ses->server) || !tree)
1466                 return -EIO;
1467
1468         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1469         if (unc_path == NULL)
1470                 return -ENOMEM;
1471
1472         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1473         unc_path_len *= 2;
1474         if (unc_path_len < 2) {
1475                 kfree(unc_path);
1476                 return -EINVAL;
1477         }
1478
1479         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1480         tcon->tid = 0;
1481
1482         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1483                              &total_len);
1484         if (rc) {
1485                 kfree(unc_path);
1486                 return rc;
1487         }
1488
1489         if (smb3_encryption_required(tcon))
1490                 flags |= CIFS_TRANSFORM_REQ;
1491
1492         iov[0].iov_base = (char *)req;
1493         /* 1 for pad */
1494         iov[0].iov_len = total_len - 1;
1495
1496         /* Testing shows that buffer offset must be at location of Buffer[0] */
1497         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1498                         - 1 /* pad */);
1499         req->PathLength = cpu_to_le16(unc_path_len - 2);
1500         iov[1].iov_base = unc_path;
1501         iov[1].iov_len = unc_path_len;
1502
1503         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1504         if ((ses->server->dialect == SMB311_PROT_ID) &&
1505             !smb3_encryption_required(tcon))
1506                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507
1508         memset(&rqst, 0, sizeof(struct smb_rqst));
1509         rqst.rq_iov = iov;
1510         rqst.rq_nvec = 2;
1511
1512         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1513         cifs_small_buf_release(req);
1514         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1515
1516         if (rc != 0) {
1517                 if (tcon) {
1518                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519                         tcon->need_reconnect = true;
1520                 }
1521                 goto tcon_error_exit;
1522         }
1523
1524         switch (rsp->ShareType) {
1525         case SMB2_SHARE_TYPE_DISK:
1526                 cifs_dbg(FYI, "connection to disk share\n");
1527                 break;
1528         case SMB2_SHARE_TYPE_PIPE:
1529                 tcon->pipe = true;
1530                 cifs_dbg(FYI, "connection to pipe share\n");
1531                 break;
1532         case SMB2_SHARE_TYPE_PRINT:
1533                 tcon->print = true;
1534                 cifs_dbg(FYI, "connection to printer\n");
1535                 break;
1536         default:
1537                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538                 rc = -EOPNOTSUPP;
1539                 goto tcon_error_exit;
1540         }
1541
1542         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545         tcon->tidStatus = CifsGood;
1546         tcon->need_reconnect = false;
1547         tcon->tid = rsp->sync_hdr.TreeId;
1548         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549
1550         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553
1554         if (tcon->seal &&
1555             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557
1558         init_copy_chunk_defaults(tcon);
1559         if (tcon->ses->server->ops->validate_negotiate)
1560                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561 tcon_exit:
1562         free_rsp_buf(resp_buftype, rsp);
1563         kfree(unc_path);
1564         return rc;
1565
1566 tcon_error_exit:
1567         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1568                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1569         }
1570         goto tcon_exit;
1571 }
1572
1573 int
1574 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1575 {
1576         struct smb_rqst rqst;
1577         struct smb2_tree_disconnect_req *req; /* response is trivial */
1578         int rc = 0;
1579         struct cifs_ses *ses = tcon->ses;
1580         int flags = 0;
1581         unsigned int total_len;
1582         struct kvec iov[1];
1583         struct kvec rsp_iov;
1584         int resp_buf_type;
1585
1586         cifs_dbg(FYI, "Tree Disconnect\n");
1587
1588         if (!ses || !(ses->server))
1589                 return -EIO;
1590
1591         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1592                 return 0;
1593
1594         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1595                              &total_len);
1596         if (rc)
1597                 return rc;
1598
1599         if (smb3_encryption_required(tcon))
1600                 flags |= CIFS_TRANSFORM_REQ;
1601
1602         flags |= CIFS_NO_RESP;
1603
1604         iov[0].iov_base = (char *)req;
1605         iov[0].iov_len = total_len;
1606
1607         memset(&rqst, 0, sizeof(struct smb_rqst));
1608         rqst.rq_iov = iov;
1609         rqst.rq_nvec = 1;
1610
1611         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1612         cifs_small_buf_release(req);
1613         if (rc)
1614                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1615
1616         return rc;
1617 }
1618
1619
1620 static struct create_durable *
1621 create_durable_buf(void)
1622 {
1623         struct create_durable *buf;
1624
1625         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1626         if (!buf)
1627                 return NULL;
1628
1629         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1630                                         (struct create_durable, Data));
1631         buf->ccontext.DataLength = cpu_to_le32(16);
1632         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1633                                 (struct create_durable, Name));
1634         buf->ccontext.NameLength = cpu_to_le16(4);
1635         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1636         buf->Name[0] = 'D';
1637         buf->Name[1] = 'H';
1638         buf->Name[2] = 'n';
1639         buf->Name[3] = 'Q';
1640         return buf;
1641 }
1642
1643 static struct create_durable *
1644 create_reconnect_durable_buf(struct cifs_fid *fid)
1645 {
1646         struct create_durable *buf;
1647
1648         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1649         if (!buf)
1650                 return NULL;
1651
1652         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1653                                         (struct create_durable, Data));
1654         buf->ccontext.DataLength = cpu_to_le32(16);
1655         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1656                                 (struct create_durable, Name));
1657         buf->ccontext.NameLength = cpu_to_le16(4);
1658         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1659         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1660         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1661         buf->Name[0] = 'D';
1662         buf->Name[1] = 'H';
1663         buf->Name[2] = 'n';
1664         buf->Name[3] = 'C';
1665         return buf;
1666 }
1667
1668 static __u8
1669 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1670                   unsigned int *epoch, char *lease_key)
1671 {
1672         char *data_offset;
1673         struct create_context *cc;
1674         unsigned int next;
1675         unsigned int remaining;
1676         char *name;
1677
1678         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1679         remaining = le32_to_cpu(rsp->CreateContextsLength);
1680         cc = (struct create_context *)data_offset;
1681         while (remaining >= sizeof(struct create_context)) {
1682                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1683                 if (le16_to_cpu(cc->NameLength) == 4 &&
1684                     strncmp(name, "RqLs", 4) == 0)
1685                         return server->ops->parse_lease_buf(cc, epoch,
1686                                                             lease_key);
1687
1688                 next = le32_to_cpu(cc->Next);
1689                 if (!next)
1690                         break;
1691                 remaining -= next;
1692                 cc = (struct create_context *)((char *)cc + next);
1693         }
1694
1695         return 0;
1696 }
1697
1698 static int
1699 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1700                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1701 {
1702         struct smb2_create_req *req = iov[0].iov_base;
1703         unsigned int num = *num_iovec;
1704
1705         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1706         if (iov[num].iov_base == NULL)
1707                 return -ENOMEM;
1708         iov[num].iov_len = server->vals->create_lease_size;
1709         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1710         if (!req->CreateContextsOffset)
1711                 req->CreateContextsOffset = cpu_to_le32(
1712                                 sizeof(struct smb2_create_req) +
1713                                 iov[num - 1].iov_len);
1714         le32_add_cpu(&req->CreateContextsLength,
1715                      server->vals->create_lease_size);
1716         *num_iovec = num + 1;
1717         return 0;
1718 }
1719
1720 static struct create_durable_v2 *
1721 create_durable_v2_buf(struct cifs_fid *pfid)
1722 {
1723         struct create_durable_v2 *buf;
1724
1725         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1726         if (!buf)
1727                 return NULL;
1728
1729         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1730                                         (struct create_durable_v2, dcontext));
1731         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1732         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1733                                 (struct create_durable_v2, Name));
1734         buf->ccontext.NameLength = cpu_to_le16(4);
1735
1736         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1737         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1738         generate_random_uuid(buf->dcontext.CreateGuid);
1739         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1740
1741         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1742         buf->Name[0] = 'D';
1743         buf->Name[1] = 'H';
1744         buf->Name[2] = '2';
1745         buf->Name[3] = 'Q';
1746         return buf;
1747 }
1748
1749 static struct create_durable_handle_reconnect_v2 *
1750 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1751 {
1752         struct create_durable_handle_reconnect_v2 *buf;
1753
1754         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1755                         GFP_KERNEL);
1756         if (!buf)
1757                 return NULL;
1758
1759         buf->ccontext.DataOffset =
1760                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1761                                      dcontext));
1762         buf->ccontext.DataLength =
1763                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1764         buf->ccontext.NameOffset =
1765                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1766                             Name));
1767         buf->ccontext.NameLength = cpu_to_le16(4);
1768
1769         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1770         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1771         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1772         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1773
1774         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1775         buf->Name[0] = 'D';
1776         buf->Name[1] = 'H';
1777         buf->Name[2] = '2';
1778         buf->Name[3] = 'C';
1779         return buf;
1780 }
1781
1782 static int
1783 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1784                     struct cifs_open_parms *oparms)
1785 {
1786         struct smb2_create_req *req = iov[0].iov_base;
1787         unsigned int num = *num_iovec;
1788
1789         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1790         if (iov[num].iov_base == NULL)
1791                 return -ENOMEM;
1792         iov[num].iov_len = sizeof(struct create_durable_v2);
1793         if (!req->CreateContextsOffset)
1794                 req->CreateContextsOffset =
1795                         cpu_to_le32(sizeof(struct smb2_create_req) +
1796                                                                 iov[1].iov_len);
1797         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1798         *num_iovec = num + 1;
1799         return 0;
1800 }
1801
1802 static int
1803 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1804                     struct cifs_open_parms *oparms)
1805 {
1806         struct smb2_create_req *req = iov[0].iov_base;
1807         unsigned int num = *num_iovec;
1808
1809         /* indicate that we don't need to relock the file */
1810         oparms->reconnect = false;
1811
1812         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1813         if (iov[num].iov_base == NULL)
1814                 return -ENOMEM;
1815         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1816         if (!req->CreateContextsOffset)
1817                 req->CreateContextsOffset =
1818                         cpu_to_le32(sizeof(struct smb2_create_req) +
1819                                                                 iov[1].iov_len);
1820         le32_add_cpu(&req->CreateContextsLength,
1821                         sizeof(struct create_durable_handle_reconnect_v2));
1822         *num_iovec = num + 1;
1823         return 0;
1824 }
1825
1826 static int
1827 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1828                     struct cifs_open_parms *oparms, bool use_persistent)
1829 {
1830         struct smb2_create_req *req = iov[0].iov_base;
1831         unsigned int num = *num_iovec;
1832
1833         if (use_persistent) {
1834                 if (oparms->reconnect)
1835                         return add_durable_reconnect_v2_context(iov, num_iovec,
1836                                                                 oparms);
1837                 else
1838                         return add_durable_v2_context(iov, num_iovec, oparms);
1839         }
1840
1841         if (oparms->reconnect) {
1842                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1843                 /* indicate that we don't need to relock the file */
1844                 oparms->reconnect = false;
1845         } else
1846                 iov[num].iov_base = create_durable_buf();
1847         if (iov[num].iov_base == NULL)
1848                 return -ENOMEM;
1849         iov[num].iov_len = sizeof(struct create_durable);
1850         if (!req->CreateContextsOffset)
1851                 req->CreateContextsOffset =
1852                         cpu_to_le32(sizeof(struct smb2_create_req) +
1853                                                                 iov[1].iov_len);
1854         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1855         *num_iovec = num + 1;
1856         return 0;
1857 }
1858
1859 /* See MS-SMB2 2.2.13.2.7 */
1860 static struct crt_twarp_ctxt *
1861 create_twarp_buf(__u64 timewarp)
1862 {
1863         struct crt_twarp_ctxt *buf;
1864
1865         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1866         if (!buf)
1867                 return NULL;
1868
1869         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1870                                         (struct crt_twarp_ctxt, Timestamp));
1871         buf->ccontext.DataLength = cpu_to_le32(8);
1872         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1873                                 (struct crt_twarp_ctxt, Name));
1874         buf->ccontext.NameLength = cpu_to_le16(4);
1875         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1876         buf->Name[0] = 'T';
1877         buf->Name[1] = 'W';
1878         buf->Name[2] = 'r';
1879         buf->Name[3] = 'p';
1880         buf->Timestamp = cpu_to_le64(timewarp);
1881         return buf;
1882 }
1883
1884 /* See MS-SMB2 2.2.13.2.7 */
1885 static int
1886 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1887 {
1888         struct smb2_create_req *req = iov[0].iov_base;
1889         unsigned int num = *num_iovec;
1890
1891         iov[num].iov_base = create_twarp_buf(timewarp);
1892         if (iov[num].iov_base == NULL)
1893                 return -ENOMEM;
1894         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1895         if (!req->CreateContextsOffset)
1896                 req->CreateContextsOffset = cpu_to_le32(
1897                                 sizeof(struct smb2_create_req) +
1898                                 iov[num - 1].iov_len);
1899         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1900         *num_iovec = num + 1;
1901         return 0;
1902 }
1903
1904 static int
1905 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1906                             const char *treename, const __le16 *path)
1907 {
1908         int treename_len, path_len;
1909         struct nls_table *cp;
1910         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1911
1912         /*
1913          * skip leading "\\"
1914          */
1915         treename_len = strlen(treename);
1916         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1917                 return -EINVAL;
1918
1919         treename += 2;
1920         treename_len -= 2;
1921
1922         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1923
1924         /*
1925          * make room for one path separator between the treename and
1926          * path
1927          */
1928         *out_len = treename_len + 1 + path_len;
1929
1930         /*
1931          * final path needs to be null-terminated UTF16 with a
1932          * size aligned to 8
1933          */
1934
1935         *out_size = roundup((*out_len+1)*2, 8);
1936         *out_path = kzalloc(*out_size, GFP_KERNEL);
1937         if (!*out_path)
1938                 return -ENOMEM;
1939
1940         cp = load_nls_default();
1941         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1942         UniStrcat(*out_path, sep);
1943         UniStrcat(*out_path, path);
1944         unload_nls(cp);
1945
1946         return 0;
1947 }
1948
1949 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1950                                umode_t mode, struct cifs_tcon *tcon,
1951                                const char *full_path,
1952                                struct cifs_sb_info *cifs_sb)
1953 {
1954         struct smb_rqst rqst;
1955         struct smb2_create_req *req;
1956         struct smb2_create_rsp *rsp = NULL;
1957         struct TCP_Server_Info *server;
1958         struct cifs_ses *ses = tcon->ses;
1959         struct kvec iov[3]; /* make sure at least one for each open context */
1960         struct kvec rsp_iov = {NULL, 0};
1961         int resp_buftype;
1962         int uni_path_len;
1963         __le16 *copy_path = NULL;
1964         int copy_size;
1965         int rc = 0;
1966         unsigned int n_iov = 2;
1967         __u32 file_attributes = 0;
1968         char *pc_buf = NULL;
1969         int flags = 0;
1970         unsigned int total_len;
1971         __le16 *utf16_path = NULL;
1972
1973         cifs_dbg(FYI, "mkdir\n");
1974
1975         /* resource #1: path allocation */
1976         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1977         if (!utf16_path)
1978                 return -ENOMEM;
1979
1980         if (ses && (ses->server))
1981                 server = ses->server;
1982         else {
1983                 rc = -EIO;
1984                 goto err_free_path;
1985         }
1986
1987         /* resource #2: request */
1988         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1989         if (rc)
1990                 goto err_free_path;
1991
1992
1993         if (smb3_encryption_required(tcon))
1994                 flags |= CIFS_TRANSFORM_REQ;
1995
1996         req->ImpersonationLevel = IL_IMPERSONATION;
1997         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1998         /* File attributes ignored on open (used in create though) */
1999         req->FileAttributes = cpu_to_le32(file_attributes);
2000         req->ShareAccess = FILE_SHARE_ALL_LE;
2001         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2002         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2003
2004         iov[0].iov_base = (char *)req;
2005         /* -1 since last byte is buf[0] which is sent below (path) */
2006         iov[0].iov_len = total_len - 1;
2007
2008         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2009
2010         /* [MS-SMB2] 2.2.13 NameOffset:
2011          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2012          * the SMB2 header, the file name includes a prefix that will
2013          * be processed during DFS name normalization as specified in
2014          * section 3.3.5.9. Otherwise, the file name is relative to
2015          * the share that is identified by the TreeId in the SMB2
2016          * header.
2017          */
2018         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2019                 int name_len;
2020
2021                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2022                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2023                                                  &name_len,
2024                                                  tcon->treeName, utf16_path);
2025                 if (rc)
2026                         goto err_free_req;
2027
2028                 req->NameLength = cpu_to_le16(name_len * 2);
2029                 uni_path_len = copy_size;
2030                 /* free before overwriting resource */
2031                 kfree(utf16_path);
2032                 utf16_path = copy_path;
2033         } else {
2034                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2035                 /* MUST set path len (NameLength) to 0 opening root of share */
2036                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2037                 if (uni_path_len % 8 != 0) {
2038                         copy_size = roundup(uni_path_len, 8);
2039                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2040                         if (!copy_path) {
2041                                 rc = -ENOMEM;
2042                                 goto err_free_req;
2043                         }
2044                         memcpy((char *)copy_path, (const char *)utf16_path,
2045                                uni_path_len);
2046                         uni_path_len = copy_size;
2047                         /* free before overwriting resource */
2048                         kfree(utf16_path);
2049                         utf16_path = copy_path;
2050                 }
2051         }
2052
2053         iov[1].iov_len = uni_path_len;
2054         iov[1].iov_base = utf16_path;
2055         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2056
2057         if (tcon->posix_extensions) {
2058                 /* resource #3: posix buf */
2059                 rc = add_posix_context(iov, &n_iov, mode);
2060                 if (rc)
2061                         goto err_free_req;
2062                 pc_buf = iov[n_iov-1].iov_base;
2063         }
2064
2065
2066         memset(&rqst, 0, sizeof(struct smb_rqst));
2067         rqst.rq_iov = iov;
2068         rqst.rq_nvec = n_iov;
2069
2070         /* resource #4: response buffer */
2071         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2072         if (rc) {
2073                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2074                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2075                                            CREATE_NOT_FILE,
2076                                            FILE_WRITE_ATTRIBUTES, rc);
2077                 goto err_free_rsp_buf;
2078         }
2079
2080         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2081         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2082                                     ses->Suid, CREATE_NOT_FILE,
2083                                     FILE_WRITE_ATTRIBUTES);
2084
2085         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2086
2087         /* Eventually save off posix specific response info and timestaps */
2088
2089 err_free_rsp_buf:
2090         free_rsp_buf(resp_buftype, rsp);
2091         kfree(pc_buf);
2092 err_free_req:
2093         cifs_small_buf_release(req);
2094 err_free_path:
2095         kfree(utf16_path);
2096         return rc;
2097 }
2098
2099 int
2100 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2101                struct cifs_open_parms *oparms, __le16 *path)
2102 {
2103         struct TCP_Server_Info *server = tcon->ses->server;
2104         struct smb2_create_req *req;
2105         unsigned int n_iov = 2;
2106         __u32 file_attributes = 0;
2107         int copy_size;
2108         int uni_path_len;
2109         unsigned int total_len;
2110         struct kvec *iov = rqst->rq_iov;
2111         __le16 *copy_path;
2112         int rc;
2113
2114         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2115         if (rc)
2116                 return rc;
2117
2118         iov[0].iov_base = (char *)req;
2119         /* -1 since last byte is buf[0] which is sent below (path) */
2120         iov[0].iov_len = total_len - 1;
2121
2122         if (oparms->create_options & CREATE_OPTION_READONLY)
2123                 file_attributes |= ATTR_READONLY;
2124         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2125                 file_attributes |= ATTR_SYSTEM;
2126
2127         req->ImpersonationLevel = IL_IMPERSONATION;
2128         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2129         /* File attributes ignored on open (used in create though) */
2130         req->FileAttributes = cpu_to_le32(file_attributes);
2131         req->ShareAccess = FILE_SHARE_ALL_LE;
2132         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2133         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2134         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2135
2136         /* [MS-SMB2] 2.2.13 NameOffset:
2137          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2138          * the SMB2 header, the file name includes a prefix that will
2139          * be processed during DFS name normalization as specified in
2140          * section 3.3.5.9. Otherwise, the file name is relative to
2141          * the share that is identified by the TreeId in the SMB2
2142          * header.
2143          */
2144         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2145                 int name_len;
2146
2147                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2148                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2149                                                  &name_len,
2150                                                  tcon->treeName, path);
2151                 if (rc)
2152                         return rc;
2153                 req->NameLength = cpu_to_le16(name_len * 2);
2154                 uni_path_len = copy_size;
2155                 path = copy_path;
2156         } else {
2157                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2158                 /* MUST set path len (NameLength) to 0 opening root of share */
2159                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2160                 copy_size = uni_path_len;
2161                 if (copy_size % 8 != 0)
2162                         copy_size = roundup(copy_size, 8);
2163                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2164                 if (!copy_path)
2165                         return -ENOMEM;
2166                 memcpy((char *)copy_path, (const char *)path,
2167                        uni_path_len);
2168                 uni_path_len = copy_size;
2169                 path = copy_path;
2170         }
2171
2172         iov[1].iov_len = uni_path_len;
2173         iov[1].iov_base = path;
2174
2175         if (!server->oplocks)
2176                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2177
2178         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2179             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2180                 req->RequestedOplockLevel = *oplock;
2181         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2182                   (oparms->create_options & CREATE_NOT_FILE))
2183                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2184         else {
2185                 rc = add_lease_context(server, iov, &n_iov,
2186                                        oparms->fid->lease_key, oplock);
2187                 if (rc)
2188                         return rc;
2189         }
2190
2191         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2192                 /* need to set Next field of lease context if we request it */
2193                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2194                         struct create_context *ccontext =
2195                             (struct create_context *)iov[n_iov-1].iov_base;
2196                         ccontext->Next =
2197                                 cpu_to_le32(server->vals->create_lease_size);
2198                 }
2199
2200                 rc = add_durable_context(iov, &n_iov, oparms,
2201                                         tcon->use_persistent);
2202                 if (rc)
2203                         return rc;
2204         }
2205
2206         if (tcon->posix_extensions) {
2207                 if (n_iov > 2) {
2208                         struct create_context *ccontext =
2209                             (struct create_context *)iov[n_iov-1].iov_base;
2210                         ccontext->Next =
2211                                 cpu_to_le32(iov[n_iov-1].iov_len);
2212                 }
2213
2214                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2215                 if (rc)
2216                         return rc;
2217         }
2218
2219         if (tcon->snapshot_time) {
2220                 cifs_dbg(FYI, "adding snapshot context\n");
2221                 if (n_iov > 2) {
2222                         struct create_context *ccontext =
2223                             (struct create_context *)iov[n_iov-1].iov_base;
2224                         ccontext->Next =
2225                                 cpu_to_le32(iov[n_iov-1].iov_len);
2226                 }
2227
2228                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2229                 if (rc)
2230                         return rc;
2231         }
2232
2233
2234         rqst->rq_nvec = n_iov;
2235         return 0;
2236 }
2237
2238 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2239  * All other vectors are freed by kfree().
2240  */
2241 void
2242 SMB2_open_free(struct smb_rqst *rqst)
2243 {
2244         int i;
2245
2246         cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2247         for (i = 1; i < rqst->rq_nvec; i++)
2248                 if (rqst->rq_iov[i].iov_base != smb2_padding)
2249                         kfree(rqst->rq_iov[i].iov_base);
2250 }
2251
2252 int
2253 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2254           __u8 *oplock, struct smb2_file_all_info *buf,
2255           struct kvec *err_iov, int *buftype)
2256 {
2257         struct smb_rqst rqst;
2258         struct smb2_create_rsp *rsp = NULL;
2259         struct TCP_Server_Info *server;
2260         struct cifs_tcon *tcon = oparms->tcon;
2261         struct cifs_ses *ses = tcon->ses;
2262         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2263         struct kvec rsp_iov = {NULL, 0};
2264         int resp_buftype = CIFS_NO_BUFFER;
2265         int rc = 0;
2266         int flags = 0;
2267
2268         cifs_dbg(FYI, "create/open\n");
2269         if (ses && (ses->server))
2270                 server = ses->server;
2271         else
2272                 return -EIO;
2273
2274         if (smb3_encryption_required(tcon))
2275                 flags |= CIFS_TRANSFORM_REQ;
2276
2277         memset(&rqst, 0, sizeof(struct smb_rqst));
2278         memset(&iov, 0, sizeof(iov));
2279         rqst.rq_iov = iov;
2280         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2281
2282         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2283         if (rc)
2284                 goto creat_exit;
2285
2286         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2287                             &rsp_iov);
2288         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2289
2290         if (rc != 0) {
2291                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2292                 if (err_iov && rsp) {
2293                         *err_iov = rsp_iov;
2294                         *buftype = resp_buftype;
2295                         resp_buftype = CIFS_NO_BUFFER;
2296                         rsp = NULL;
2297                 }
2298                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2299                                     oparms->create_options, oparms->desired_access, rc);
2300                 goto creat_exit;
2301         } else
2302                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2303                                      ses->Suid, oparms->create_options,
2304                                      oparms->desired_access);
2305
2306         oparms->fid->persistent_fid = rsp->PersistentFileId;
2307         oparms->fid->volatile_fid = rsp->VolatileFileId;
2308
2309         if (buf) {
2310                 memcpy(buf, &rsp->CreationTime, 32);
2311                 buf->AllocationSize = rsp->AllocationSize;
2312                 buf->EndOfFile = rsp->EndofFile;
2313                 buf->Attributes = rsp->FileAttributes;
2314                 buf->NumberOfLinks = cpu_to_le32(1);
2315                 buf->DeletePending = 0;
2316         }
2317
2318         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2319                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2320                                             oparms->fid->lease_key);
2321         else
2322                 *oplock = rsp->OplockLevel;
2323 creat_exit:
2324         SMB2_open_free(&rqst);
2325         free_rsp_buf(resp_buftype, rsp);
2326         return rc;
2327 }
2328
2329 /*
2330  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2331  */
2332 int
2333 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2334            u64 volatile_fid, u32 opcode, bool is_fsctl,
2335            char *in_data, u32 indatalen,
2336            char **out_data, u32 *plen /* returned data len */)
2337 {
2338         struct smb_rqst rqst;
2339         struct smb2_ioctl_req *req;
2340         struct smb2_ioctl_rsp *rsp;
2341         struct cifs_ses *ses;
2342         struct kvec iov[2];
2343         struct kvec rsp_iov;
2344         int resp_buftype;
2345         int n_iov;
2346         int rc = 0;
2347         int flags = 0;
2348         unsigned int total_len;
2349
2350         cifs_dbg(FYI, "SMB2 IOCTL\n");
2351
2352         if (out_data != NULL)
2353                 *out_data = NULL;
2354
2355         /* zero out returned data len, in case of error */
2356         if (plen)
2357                 *plen = 0;
2358
2359         if (tcon)
2360                 ses = tcon->ses;
2361         else
2362                 return -EIO;
2363
2364         if (!ses || !(ses->server))
2365                 return -EIO;
2366
2367         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2368         if (rc)
2369                 return rc;
2370
2371         if (smb3_encryption_required(tcon))
2372                 flags |= CIFS_TRANSFORM_REQ;
2373
2374         req->CtlCode = cpu_to_le32(opcode);
2375         req->PersistentFileId = persistent_fid;
2376         req->VolatileFileId = volatile_fid;
2377
2378         if (indatalen) {
2379                 req->InputCount = cpu_to_le32(indatalen);
2380                 /* do not set InputOffset if no input data */
2381                 req->InputOffset =
2382                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2383                 iov[1].iov_base = in_data;
2384                 iov[1].iov_len = indatalen;
2385                 n_iov = 2;
2386         } else
2387                 n_iov = 1;
2388
2389         req->OutputOffset = 0;
2390         req->OutputCount = 0; /* MBZ */
2391
2392         /*
2393          * Could increase MaxOutputResponse, but that would require more
2394          * than one credit. Windows typically sets this smaller, but for some
2395          * ioctls it may be useful to allow server to send more. No point
2396          * limiting what the server can send as long as fits in one credit
2397          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2398          * (by default, note that it can be overridden to make max larger)
2399          * in responses (except for read responses which can be bigger.
2400          * We may want to bump this limit up
2401          */
2402         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2403
2404         if (is_fsctl)
2405                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2406         else
2407                 req->Flags = 0;
2408
2409         iov[0].iov_base = (char *)req;
2410
2411         /*
2412          * If no input data, the size of ioctl struct in
2413          * protocol spec still includes a 1 byte data buffer,
2414          * but if input data passed to ioctl, we do not
2415          * want to double count this, so we do not send
2416          * the dummy one byte of data in iovec[0] if sending
2417          * input data (in iovec[1]).
2418          */
2419
2420         if (indatalen) {
2421                 iov[0].iov_len = total_len - 1;
2422         } else
2423                 iov[0].iov_len = total_len;
2424
2425         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2426         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2427                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2428
2429         memset(&rqst, 0, sizeof(struct smb_rqst));
2430         rqst.rq_iov = iov;
2431         rqst.rq_nvec = n_iov;
2432
2433         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2434                             &rsp_iov);
2435         cifs_small_buf_release(req);
2436         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2437
2438         if (rc != 0)
2439                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2440                                 ses->Suid, 0, opcode, rc);
2441
2442         if ((rc != 0) && (rc != -EINVAL)) {
2443                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2444                 goto ioctl_exit;
2445         } else if (rc == -EINVAL) {
2446                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2447                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2448                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2449                         goto ioctl_exit;
2450                 }
2451         }
2452
2453         /* check if caller wants to look at return data or just return rc */
2454         if ((plen == NULL) || (out_data == NULL))
2455                 goto ioctl_exit;
2456
2457         *plen = le32_to_cpu(rsp->OutputCount);
2458
2459         /* We check for obvious errors in the output buffer length and offset */
2460         if (*plen == 0)
2461                 goto ioctl_exit; /* server returned no data */
2462         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2463                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2464                 *plen = 0;
2465                 rc = -EIO;
2466                 goto ioctl_exit;
2467         }
2468
2469         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2470                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2471                         le32_to_cpu(rsp->OutputOffset));
2472                 *plen = 0;
2473                 rc = -EIO;
2474                 goto ioctl_exit;
2475         }
2476
2477         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2478                             *plen, GFP_KERNEL);
2479         if (*out_data == NULL) {
2480                 rc = -ENOMEM;
2481                 goto ioctl_exit;
2482         }
2483
2484 ioctl_exit:
2485         free_rsp_buf(resp_buftype, rsp);
2486         return rc;
2487 }
2488
2489 /*
2490  *   Individual callers to ioctl worker function follow
2491  */
2492
2493 int
2494 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2495                      u64 persistent_fid, u64 volatile_fid)
2496 {
2497         int rc;
2498         struct  compress_ioctl fsctl_input;
2499         char *ret_data = NULL;
2500
2501         fsctl_input.CompressionState =
2502                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2503
2504         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2505                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2506                         (char *)&fsctl_input /* data input */,
2507                         2 /* in data len */, &ret_data /* out data */, NULL);
2508
2509         cifs_dbg(FYI, "set compression rc %d\n", rc);
2510
2511         return rc;
2512 }
2513
2514 int
2515 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2516                 u64 persistent_fid, u64 volatile_fid)
2517 {
2518         struct smb2_close_req *req;
2519         struct kvec *iov = rqst->rq_iov;
2520         unsigned int total_len;
2521         int rc;
2522
2523         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2524         if (rc)
2525                 return rc;
2526
2527         req->PersistentFileId = persistent_fid;
2528         req->VolatileFileId = volatile_fid;
2529         iov[0].iov_base = (char *)req;
2530         iov[0].iov_len = total_len;
2531
2532         return 0;
2533 }
2534
2535 void
2536 SMB2_close_free(struct smb_rqst *rqst)
2537 {
2538         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2539 }
2540
2541 int
2542 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2543                  u64 persistent_fid, u64 volatile_fid, int flags)
2544 {
2545         struct smb_rqst rqst;
2546         struct smb2_close_rsp *rsp = NULL;
2547         struct cifs_ses *ses = tcon->ses;
2548         struct kvec iov[1];
2549         struct kvec rsp_iov;
2550         int resp_buftype = CIFS_NO_BUFFER;
2551         int rc = 0;
2552
2553         cifs_dbg(FYI, "Close\n");
2554
2555         if (!ses || !(ses->server))
2556                 return -EIO;
2557
2558         if (smb3_encryption_required(tcon))
2559                 flags |= CIFS_TRANSFORM_REQ;
2560
2561         memset(&rqst, 0, sizeof(struct smb_rqst));
2562         memset(&iov, 0, sizeof(iov));
2563         rqst.rq_iov = iov;
2564         rqst.rq_nvec = 1;
2565
2566         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2567         if (rc)
2568                 goto close_exit;
2569
2570         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2571         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2572
2573         if (rc != 0) {
2574                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2575                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2576                                      rc);
2577                 goto close_exit;
2578         }
2579
2580         /* BB FIXME - decode close response, update inode for caching */
2581
2582 close_exit:
2583         SMB2_close_free(&rqst);
2584         free_rsp_buf(resp_buftype, rsp);
2585         return rc;
2586 }
2587
2588 int
2589 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2590            u64 persistent_fid, u64 volatile_fid)
2591 {
2592         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2593 }
2594
2595 int
2596 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2597                   struct kvec *iov, unsigned int min_buf_size)
2598 {
2599         unsigned int smb_len = iov->iov_len;
2600         char *end_of_smb = smb_len + (char *)iov->iov_base;
2601         char *begin_of_buf = offset + (char *)iov->iov_base;
2602         char *end_of_buf = begin_of_buf + buffer_length;
2603
2604
2605         if (buffer_length < min_buf_size) {
2606                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2607                          buffer_length, min_buf_size);
2608                 return -EINVAL;
2609         }
2610
2611         /* check if beyond RFC1001 maximum length */
2612         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2613                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2614                          buffer_length, smb_len);
2615                 return -EINVAL;
2616         }
2617
2618         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2619                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2620                 return -EINVAL;
2621         }
2622
2623         return 0;
2624 }
2625
2626 /*
2627  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2628  * Caller must free buffer.
2629  */
2630 int
2631 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2632                            struct kvec *iov, unsigned int minbufsize,
2633                            char *data)
2634 {
2635         char *begin_of_buf = offset + (char *)iov->iov_base;
2636         int rc;
2637
2638         if (!data)
2639                 return -EINVAL;
2640
2641         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2642         if (rc)
2643                 return rc;
2644
2645         memcpy(data, begin_of_buf, buffer_length);
2646
2647         return 0;
2648 }
2649
2650 int
2651 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2652                      u64 persistent_fid, u64 volatile_fid,
2653                      u8 info_class, u8 info_type, u32 additional_info,
2654                      size_t output_len, size_t input_len, void *input)
2655 {
2656         struct smb2_query_info_req *req;
2657         struct kvec *iov = rqst->rq_iov;
2658         unsigned int total_len;
2659         int rc;
2660
2661         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2662                              &total_len);
2663         if (rc)
2664                 return rc;
2665
2666         req->InfoType = info_type;
2667         req->FileInfoClass = info_class;
2668         req->PersistentFileId = persistent_fid;
2669         req->VolatileFileId = volatile_fid;
2670         req->AdditionalInformation = cpu_to_le32(additional_info);
2671
2672         req->OutputBufferLength = cpu_to_le32(output_len);
2673         if (input_len) {
2674                 req->InputBufferLength = cpu_to_le32(input_len);
2675                 /* total_len for smb query request never close to le16 max */
2676                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2677                 memcpy(req->Buffer, input, input_len);
2678         }
2679
2680         iov[0].iov_base = (char *)req;
2681         /* 1 for Buffer */
2682         iov[0].iov_len = total_len - 1 + input_len;
2683         return 0;
2684 }
2685
2686 void
2687 SMB2_query_info_free(struct smb_rqst *rqst)
2688 {
2689         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2690 }
2691
2692 static int
2693 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2694            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2695            u32 additional_info, size_t output_len, size_t min_len, void **data,
2696                 u32 *dlen)
2697 {
2698         struct smb_rqst rqst;
2699         struct smb2_query_info_rsp *rsp = NULL;
2700         struct kvec iov[1];
2701         struct kvec rsp_iov;
2702         int rc = 0;
2703         int resp_buftype = CIFS_NO_BUFFER;
2704         struct cifs_ses *ses = tcon->ses;
2705         int flags = 0;
2706
2707         cifs_dbg(FYI, "Query Info\n");
2708
2709         if (!ses || !(ses->server))
2710                 return -EIO;
2711
2712         if (smb3_encryption_required(tcon))
2713                 flags |= CIFS_TRANSFORM_REQ;
2714
2715         memset(&rqst, 0, sizeof(struct smb_rqst));
2716         memset(&iov, 0, sizeof(iov));
2717         rqst.rq_iov = iov;
2718         rqst.rq_nvec = 1;
2719
2720         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2721                                   info_class, info_type, additional_info,
2722                                   output_len, 0, NULL);
2723         if (rc)
2724                 goto qinf_exit;
2725
2726         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2727         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2728
2729         if (rc) {
2730                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2731                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2732                                 ses->Suid, info_class, (__u32)info_type, rc);
2733                 goto qinf_exit;
2734         }
2735
2736         if (dlen) {
2737                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2738                 if (!*data) {
2739                         *data = kmalloc(*dlen, GFP_KERNEL);
2740                         if (!*data) {
2741                                 cifs_dbg(VFS,
2742                                         "Error %d allocating memory for acl\n",
2743                                         rc);
2744                                 *dlen = 0;
2745                                 goto qinf_exit;
2746                         }
2747                 }
2748         }
2749
2750         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2751                                         le32_to_cpu(rsp->OutputBufferLength),
2752                                         &rsp_iov, min_len, *data);
2753
2754 qinf_exit:
2755         SMB2_query_info_free(&rqst);
2756         free_rsp_buf(resp_buftype, rsp);
2757         return rc;
2758 }
2759
2760 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2761                    u64 persistent_fid, u64 volatile_fid,
2762                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2763 {
2764         return query_info(xid, tcon, persistent_fid, volatile_fid,
2765                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2766                           ea_buf_size,
2767                           sizeof(struct smb2_file_full_ea_info),
2768                           (void **)&data,
2769                           NULL);
2770 }
2771
2772 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2773         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2774 {
2775         return query_info(xid, tcon, persistent_fid, volatile_fid,
2776                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2777                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2778                           sizeof(struct smb2_file_all_info), (void **)&data,
2779                           NULL);
2780 }
2781
2782 int
2783 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2784                 u64 persistent_fid, u64 volatile_fid,
2785                 void **data, u32 *plen)
2786 {
2787         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2788         *plen = 0;
2789
2790         return query_info(xid, tcon, persistent_fid, volatile_fid,
2791                           0, SMB2_O_INFO_SECURITY, additional_info,
2792                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2793 }
2794
2795 int
2796 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2797                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2798 {
2799         return query_info(xid, tcon, persistent_fid, volatile_fid,
2800                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2801                           sizeof(struct smb2_file_internal_info),
2802                           sizeof(struct smb2_file_internal_info),
2803                           (void **)&uniqueid, NULL);
2804 }
2805
2806 /*
2807  * This is a no-op for now. We're not really interested in the reply, but
2808  * rather in the fact that the server sent one and that server->lstrp
2809  * gets updated.
2810  *
2811  * FIXME: maybe we should consider checking that the reply matches request?
2812  */
2813 static void
2814 smb2_echo_callback(struct mid_q_entry *mid)
2815 {
2816         struct TCP_Server_Info *server = mid->callback_data;
2817         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2818         unsigned int credits_received = 1;
2819
2820         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2821                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2822
2823         DeleteMidQEntry(mid);
2824         add_credits(server, credits_received, CIFS_ECHO_OP);
2825 }
2826
2827 void smb2_reconnect_server(struct work_struct *work)
2828 {
2829         struct TCP_Server_Info *server = container_of(work,
2830                                         struct TCP_Server_Info, reconnect.work);
2831         struct cifs_ses *ses;
2832         struct cifs_tcon *tcon, *tcon2;
2833         struct list_head tmp_list;
2834         int tcon_exist = false;
2835         int rc;
2836         int resched = false;
2837
2838
2839         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2840         mutex_lock(&server->reconnect_mutex);
2841
2842         INIT_LIST_HEAD(&tmp_list);
2843         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2844
2845         spin_lock(&cifs_tcp_ses_lock);
2846         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2847                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2848                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2849                                 tcon->tc_count++;
2850                                 list_add_tail(&tcon->rlist, &tmp_list);
2851                                 tcon_exist = true;
2852                         }
2853                 }
2854                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2855                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2856                         tcon_exist = true;
2857                 }
2858         }
2859         /*
2860          * Get the reference to server struct to be sure that the last call of
2861          * cifs_put_tcon() in the loop below won't release the server pointer.
2862          */
2863         if (tcon_exist)
2864                 server->srv_count++;
2865
2866         spin_unlock(&cifs_tcp_ses_lock);
2867
2868         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2869                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2870                 if (!rc)
2871                         cifs_reopen_persistent_handles(tcon);
2872                 else
2873                         resched = true;
2874                 list_del_init(&tcon->rlist);
2875                 cifs_put_tcon(tcon);
2876         }
2877
2878         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2879         if (resched)
2880                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2881         mutex_unlock(&server->reconnect_mutex);
2882
2883         /* now we can safely release srv struct */
2884         if (tcon_exist)
2885                 cifs_put_tcp_session(server, 1);
2886 }
2887
2888 int
2889 SMB2_echo(struct TCP_Server_Info *server)
2890 {
2891         struct smb2_echo_req *req;
2892         int rc = 0;
2893         struct kvec iov[1];
2894         struct smb_rqst rqst = { .rq_iov = iov,
2895                                  .rq_nvec = 1 };
2896         unsigned int total_len;
2897
2898         cifs_dbg(FYI, "In echo request\n");
2899
2900         if (server->tcpStatus == CifsNeedNegotiate) {
2901                 /* No need to send echo on newly established connections */
2902                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2903                 return rc;
2904         }
2905
2906         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2907         if (rc)
2908                 return rc;
2909
2910         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2911
2912         iov[0].iov_len = total_len;
2913         iov[0].iov_base = (char *)req;
2914
2915         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2916                              server, CIFS_ECHO_OP);
2917         if (rc)
2918                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2919
2920         cifs_small_buf_release(req);
2921         return rc;
2922 }
2923
2924 int
2925 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2926            u64 volatile_fid)
2927 {
2928         struct smb_rqst rqst;
2929         struct smb2_flush_req *req;
2930         struct cifs_ses *ses = tcon->ses;
2931         struct kvec iov[1];
2932         struct kvec rsp_iov;
2933         int resp_buftype;
2934         int rc = 0;
2935         int flags = 0;
2936         unsigned int total_len;
2937
2938         cifs_dbg(FYI, "Flush\n");
2939
2940         if (!ses || !(ses->server))
2941                 return -EIO;
2942
2943         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2944         if (rc)
2945                 return rc;
2946
2947         if (smb3_encryption_required(tcon))
2948                 flags |= CIFS_TRANSFORM_REQ;
2949
2950         req->PersistentFileId = persistent_fid;
2951         req->VolatileFileId = volatile_fid;
2952
2953         iov[0].iov_base = (char *)req;
2954         iov[0].iov_len = total_len;
2955
2956         memset(&rqst, 0, sizeof(struct smb_rqst));
2957         rqst.rq_iov = iov;
2958         rqst.rq_nvec = 1;
2959
2960         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2961         cifs_small_buf_release(req);
2962
2963         if (rc != 0) {
2964                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2965                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2966                                      rc);
2967         }
2968
2969         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2970         return rc;
2971 }
2972
2973 /*
2974  * To form a chain of read requests, any read requests after the first should
2975  * have the end_of_chain boolean set to true.
2976  */
2977 static int
2978 smb2_new_read_req(void **buf, unsigned int *total_len,
2979         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2980         unsigned int remaining_bytes, int request_type)
2981 {
2982         int rc = -EACCES;
2983         struct smb2_read_plain_req *req = NULL;
2984         struct smb2_sync_hdr *shdr;
2985         struct TCP_Server_Info *server;
2986
2987         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2988                                  total_len);
2989         if (rc)
2990                 return rc;
2991
2992         server = io_parms->tcon->ses->server;
2993         if (server == NULL)
2994                 return -ECONNABORTED;
2995
2996         shdr = &req->sync_hdr;
2997         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2998
2999         req->PersistentFileId = io_parms->persistent_fid;
3000         req->VolatileFileId = io_parms->volatile_fid;
3001         req->ReadChannelInfoOffset = 0; /* reserved */
3002         req->ReadChannelInfoLength = 0; /* reserved */
3003         req->Channel = 0; /* reserved */
3004         req->MinimumCount = 0;
3005         req->Length = cpu_to_le32(io_parms->length);
3006         req->Offset = cpu_to_le64(io_parms->offset);
3007 #ifdef CONFIG_CIFS_SMB_DIRECT
3008         /*
3009          * If we want to do a RDMA write, fill in and append
3010          * smbd_buffer_descriptor_v1 to the end of read request
3011          */
3012         if (server->rdma && rdata && !server->sign &&
3013                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3014
3015                 struct smbd_buffer_descriptor_v1 *v1;
3016                 bool need_invalidate =
3017                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3018
3019                 rdata->mr = smbd_register_mr(
3020                                 server->smbd_conn, rdata->pages,
3021                                 rdata->nr_pages, rdata->page_offset,
3022                                 rdata->tailsz, true, need_invalidate);
3023                 if (!rdata->mr)
3024                         return -ENOBUFS;
3025
3026                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3027                 if (need_invalidate)
3028                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3029                 req->ReadChannelInfoOffset =
3030                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3031                 req->ReadChannelInfoLength =
3032                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3033                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3034                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3035                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3036                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3037
3038                 *total_len += sizeof(*v1) - 1;
3039         }
3040 #endif
3041         if (request_type & CHAINED_REQUEST) {
3042                 if (!(request_type & END_OF_CHAIN)) {
3043                         /* next 8-byte aligned request */
3044                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3045                         shdr->NextCommand = cpu_to_le32(*total_len);
3046                 } else /* END_OF_CHAIN */
3047                         shdr->NextCommand = 0;
3048                 if (request_type & RELATED_REQUEST) {
3049                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3050                         /*
3051                          * Related requests use info from previous read request
3052                          * in chain.
3053                          */
3054                         shdr->SessionId = 0xFFFFFFFF;
3055                         shdr->TreeId = 0xFFFFFFFF;
3056                         req->PersistentFileId = 0xFFFFFFFF;
3057                         req->VolatileFileId = 0xFFFFFFFF;
3058                 }
3059         }
3060         if (remaining_bytes > io_parms->length)
3061                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3062         else
3063                 req->RemainingBytes = 0;
3064
3065         *buf = req;
3066         return rc;
3067 }
3068
3069 static void
3070 smb2_readv_callback(struct mid_q_entry *mid)
3071 {
3072         struct cifs_readdata *rdata = mid->callback_data;
3073         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3074         struct TCP_Server_Info *server = tcon->ses->server;
3075         struct smb2_sync_hdr *shdr =
3076                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3077         unsigned int credits_received = 1;
3078         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3079                                  .rq_nvec = 2,
3080                                  .rq_pages = rdata->pages,
3081                                  .rq_offset = rdata->page_offset,
3082                                  .rq_npages = rdata->nr_pages,
3083                                  .rq_pagesz = rdata->pagesz,
3084                                  .rq_tailsz = rdata->tailsz };
3085
3086         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3087                  __func__, mid->mid, mid->mid_state, rdata->result,
3088                  rdata->bytes);
3089
3090         switch (mid->mid_state) {
3091         case MID_RESPONSE_RECEIVED:
3092                 credits_received = le16_to_cpu(shdr->CreditRequest);
3093                 /* result already set, check signature */
3094                 if (server->sign && !mid->decrypted) {
3095                         int rc;
3096
3097                         rc = smb2_verify_signature(&rqst, server);
3098                         if (rc)
3099                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3100                                          rc);
3101                 }
3102                 /* FIXME: should this be counted toward the initiating task? */
3103                 task_io_account_read(rdata->got_bytes);
3104                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3105                 break;
3106         case MID_REQUEST_SUBMITTED:
3107         case MID_RETRY_NEEDED:
3108                 rdata->result = -EAGAIN;
3109                 if (server->sign && rdata->got_bytes)
3110                         /* reset bytes number since we can not check a sign */
3111                         rdata->got_bytes = 0;
3112                 /* FIXME: should this be counted toward the initiating task? */
3113                 task_io_account_read(rdata->got_bytes);
3114                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3115                 break;
3116         default:
3117                 if (rdata->result != -ENODATA)
3118                         rdata->result = -EIO;
3119         }
3120 #ifdef CONFIG_CIFS_SMB_DIRECT
3121         /*
3122          * If this rdata has a memmory registered, the MR can be freed
3123          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3124          * because they have limited number and are used for future I/Os
3125          */
3126         if (rdata->mr) {
3127                 smbd_deregister_mr(rdata->mr);
3128                 rdata->mr = NULL;
3129         }
3130 #endif
3131         if (rdata->result)
3132                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3133
3134         queue_work(cifsiod_wq, &rdata->work);
3135         DeleteMidQEntry(mid);
3136         add_credits(server, credits_received, 0);
3137 }
3138
3139 /* smb2_async_readv - send an async read, and set up mid to handle result */
3140 int
3141 smb2_async_readv(struct cifs_readdata *rdata)
3142 {
3143         int rc, flags = 0;
3144         char *buf;
3145         struct smb2_sync_hdr *shdr;
3146         struct cifs_io_parms io_parms;
3147         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3148                                  .rq_nvec = 1 };
3149         struct TCP_Server_Info *server;
3150         unsigned int total_len;
3151
3152         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3153                  __func__, rdata->offset, rdata->bytes);
3154
3155         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3156         io_parms.offset = rdata->offset;
3157         io_parms.length = rdata->bytes;
3158         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3159         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3160         io_parms.pid = rdata->pid;
3161
3162         server = io_parms.tcon->ses->server;
3163
3164         rc = smb2_new_read_req(
3165                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3166         if (rc) {
3167                 if (rc == -EAGAIN && rdata->credits) {
3168                         /* credits was reset by reconnect */
3169                         rdata->credits = 0;
3170                         /* reduce in_flight value since we won't send the req */
3171                         spin_lock(&server->req_lock);
3172                         server->in_flight--;
3173                         spin_unlock(&server->req_lock);
3174                 }
3175                 return rc;
3176         }
3177
3178         if (smb3_encryption_required(io_parms.tcon))
3179                 flags |= CIFS_TRANSFORM_REQ;
3180
3181         rdata->iov[0].iov_base = buf;
3182         rdata->iov[0].iov_len = total_len;
3183
3184         shdr = (struct smb2_sync_hdr *)buf;
3185
3186         if (rdata->credits) {
3187                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3188                                                 SMB2_MAX_BUFFER_SIZE));
3189                 shdr->CreditRequest = shdr->CreditCharge;
3190                 spin_lock(&server->req_lock);
3191                 server->credits += rdata->credits -
3192                                                 le16_to_cpu(shdr->CreditCharge);
3193                 spin_unlock(&server->req_lock);
3194                 wake_up(&server->request_q);
3195                 flags |= CIFS_HAS_CREDITS;
3196         }
3197
3198         kref_get(&rdata->refcount);
3199         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3200                              cifs_readv_receive, smb2_readv_callback,
3201                              smb3_handle_read_data, rdata, flags);
3202         if (rc) {
3203                 kref_put(&rdata->refcount, cifs_readdata_release);
3204                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3205                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3206                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3207                                    io_parms.offset, io_parms.length);
3208         } else
3209                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3210                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3211                                    io_parms.offset, io_parms.length);
3212
3213         cifs_small_buf_release(buf);
3214         return rc;
3215 }
3216
3217 int
3218 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3219           unsigned int *nbytes, char **buf, int *buf_type)
3220 {
3221         struct smb_rqst rqst;
3222         int resp_buftype, rc = -EACCES;
3223         struct smb2_read_plain_req *req = NULL;
3224         struct smb2_read_rsp *rsp = NULL;
3225         struct kvec iov[1];
3226         struct kvec rsp_iov;
3227         unsigned int total_len;
3228         int flags = CIFS_LOG_ERROR;
3229         struct cifs_ses *ses = io_parms->tcon->ses;
3230
3231         *nbytes = 0;
3232         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3233         if (rc)
3234                 return rc;
3235
3236         if (smb3_encryption_required(io_parms->tcon))
3237                 flags |= CIFS_TRANSFORM_REQ;
3238
3239         iov[0].iov_base = (char *)req;
3240         iov[0].iov_len = total_len;
3241
3242         memset(&rqst, 0, sizeof(struct smb_rqst));
3243         rqst.rq_iov = iov;
3244         rqst.rq_nvec = 1;
3245
3246         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3247         cifs_small_buf_release(req);
3248
3249         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3250
3251         if (rc) {
3252                 if (rc != -ENODATA) {
3253                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3254                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3255                 }
3256                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3257                                     io_parms->tcon->tid, ses->Suid,
3258                                     io_parms->offset, io_parms->length);
3259                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3260                 return rc == -ENODATA ? 0 : rc;
3261         } else
3262                 trace_smb3_read_done(xid, req->PersistentFileId,
3263                                     io_parms->tcon->tid, ses->Suid,
3264                                     io_parms->offset, io_parms->length);
3265
3266         *nbytes = le32_to_cpu(rsp->DataLength);
3267         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3268             (*nbytes > io_parms->length)) {
3269                 cifs_dbg(FYI, "bad length %d for count %d\n",
3270                          *nbytes, io_parms->length);
3271                 rc = -EIO;
3272                 *nbytes = 0;
3273         }
3274
3275         if (*buf) {
3276                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3277                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3278         } else if (resp_buftype != CIFS_NO_BUFFER) {
3279                 *buf = rsp_iov.iov_base;
3280                 if (resp_buftype == CIFS_SMALL_BUFFER)
3281                         *buf_type = CIFS_SMALL_BUFFER;
3282                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3283                         *buf_type = CIFS_LARGE_BUFFER;
3284         }
3285         return rc;
3286 }
3287
3288 /*
3289  * Check the mid_state and signature on received buffer (if any), and queue the
3290  * workqueue completion task.
3291  */
3292 static void
3293 smb2_writev_callback(struct mid_q_entry *mid)
3294 {
3295         struct cifs_writedata *wdata = mid->callback_data;
3296         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3297         unsigned int written;
3298         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3299         unsigned int credits_received = 1;
3300
3301         switch (mid->mid_state) {
3302         case MID_RESPONSE_RECEIVED:
3303                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3304                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3305                 if (wdata->result != 0)
3306                         break;
3307
3308                 written = le32_to_cpu(rsp->DataLength);
3309                 /*
3310                  * Mask off high 16 bits when bytes written as returned
3311                  * by the server is greater than bytes requested by the
3312                  * client. OS/2 servers are known to set incorrect
3313                  * CountHigh values.
3314                  */
3315                 if (written > wdata->bytes)
3316                         written &= 0xFFFF;
3317
3318                 if (written < wdata->bytes)
3319                         wdata->result = -ENOSPC;
3320                 else
3321                         wdata->bytes = written;
3322                 break;
3323         case MID_REQUEST_SUBMITTED:
3324         case MID_RETRY_NEEDED:
3325                 wdata->result = -EAGAIN;
3326                 break;
3327         default:
3328                 wdata->result = -EIO;
3329                 break;
3330         }
3331 #ifdef CONFIG_CIFS_SMB_DIRECT
3332         /*
3333          * If this wdata has a memory registered, the MR can be freed
3334          * The number of MRs available is limited, it's important to recover
3335          * used MR as soon as I/O is finished. Hold MR longer in the later
3336          * I/O process can possibly result in I/O deadlock due to lack of MR
3337          * to send request on I/O retry
3338          */
3339         if (wdata->mr) {
3340                 smbd_deregister_mr(wdata->mr);
3341                 wdata->mr = NULL;
3342         }
3343 #endif
3344         if (wdata->result)
3345                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3346
3347         queue_work(cifsiod_wq, &wdata->work);
3348         DeleteMidQEntry(mid);
3349         add_credits(tcon->ses->server, credits_received, 0);
3350 }
3351
3352 /* smb2_async_writev - send an async write, and set up mid to handle result */
3353 int
3354 smb2_async_writev(struct cifs_writedata *wdata,
3355                   void (*release)(struct kref *kref))
3356 {
3357         int rc = -EACCES, flags = 0;
3358         struct smb2_write_req *req = NULL;
3359         struct smb2_sync_hdr *shdr;
3360         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3361         struct TCP_Server_Info *server = tcon->ses->server;
3362         struct kvec iov[1];
3363         struct smb_rqst rqst = { };
3364         unsigned int total_len;
3365
3366         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3367         if (rc) {
3368                 if (rc == -EAGAIN && wdata->credits) {
3369                         /* credits was reset by reconnect */
3370                         wdata->credits = 0;
3371                         /* reduce in_flight value since we won't send the req */
3372                         spin_lock(&server->req_lock);
3373                         server->in_flight--;
3374                         spin_unlock(&server->req_lock);
3375                 }
3376                 goto async_writev_out;
3377         }
3378
3379         if (smb3_encryption_required(tcon))
3380                 flags |= CIFS_TRANSFORM_REQ;
3381
3382         shdr = (struct smb2_sync_hdr *)req;
3383         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3384
3385         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3386         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3387         req->WriteChannelInfoOffset = 0;
3388         req->WriteChannelInfoLength = 0;
3389         req->Channel = 0;
3390         req->Offset = cpu_to_le64(wdata->offset);
3391         req->DataOffset = cpu_to_le16(
3392                                 offsetof(struct smb2_write_req, Buffer));
3393         req->RemainingBytes = 0;
3394 #ifdef CONFIG_CIFS_SMB_DIRECT
3395         /*
3396          * If we want to do a server RDMA read, fill in and append
3397          * smbd_buffer_descriptor_v1 to the end of write request
3398          */
3399         if (server->rdma && !server->sign && wdata->bytes >=
3400                 server->smbd_conn->rdma_readwrite_threshold) {
3401
3402                 struct smbd_buffer_descriptor_v1 *v1;
3403                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3404
3405                 wdata->mr = smbd_register_mr(
3406                                 server->smbd_conn, wdata->pages,
3407                                 wdata->nr_pages, wdata->page_offset,
3408                                 wdata->tailsz, false, need_invalidate);
3409                 if (!wdata->mr) {
3410                         rc = -ENOBUFS;
3411                         goto async_writev_out;
3412                 }
3413                 req->Length = 0;
3414                 req->DataOffset = 0;
3415                 if (wdata->nr_pages > 1)
3416                         req->RemainingBytes =
3417                                 cpu_to_le32(
3418                                         (wdata->nr_pages - 1) * wdata->pagesz -
3419                                         wdata->page_offset + wdata->tailsz
3420                                 );
3421                 else
3422                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3423                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3424                 if (need_invalidate)
3425                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3426                 req->WriteChannelInfoOffset =
3427                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3428                 req->WriteChannelInfoLength =
3429                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3430                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3431                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3432                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3433                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3434         }
3435 #endif
3436         iov[0].iov_len = total_len - 1;
3437         iov[0].iov_base = (char *)req;
3438
3439         rqst.rq_iov = iov;
3440         rqst.rq_nvec = 1;
3441         rqst.rq_pages = wdata->pages;
3442         rqst.rq_offset = wdata->page_offset;
3443         rqst.rq_npages = wdata->nr_pages;
3444         rqst.rq_pagesz = wdata->pagesz;
3445         rqst.rq_tailsz = wdata->tailsz;
3446 #ifdef CONFIG_CIFS_SMB_DIRECT
3447         if (wdata->mr) {
3448                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3449                 rqst.rq_npages = 0;
3450         }
3451 #endif
3452         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3453                  wdata->offset, wdata->bytes);
3454
3455 #ifdef CONFIG_CIFS_SMB_DIRECT
3456         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3457         if (!wdata->mr)
3458                 req->Length = cpu_to_le32(wdata->bytes);
3459 #else
3460         req->Length = cpu_to_le32(wdata->bytes);
3461 #endif
3462
3463         if (wdata->credits) {
3464                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3465                                                     SMB2_MAX_BUFFER_SIZE));
3466                 shdr->CreditRequest = shdr->CreditCharge;
3467                 spin_lock(&server->req_lock);
3468                 server->credits += wdata->credits -
3469                                                 le16_to_cpu(shdr->CreditCharge);
3470                 spin_unlock(&server->req_lock);
3471                 wake_up(&server->request_q);
3472                 flags |= CIFS_HAS_CREDITS;
3473         }
3474
3475         kref_get(&wdata->refcount);
3476         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3477                              wdata, flags);
3478
3479         if (rc) {
3480                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3481                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3482                                      wdata->bytes, rc);
3483                 kref_put(&wdata->refcount, release);
3484                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3485         } else
3486                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3487                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3488                                      wdata->bytes);
3489
3490 async_writev_out:
3491         cifs_small_buf_release(req);
3492         return rc;
3493 }
3494
3495 /*
3496  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3497  * The length field from io_parms must be at least 1 and indicates a number of
3498  * elements with data to write that begins with position 1 in iov array. All
3499  * data length is specified by count.
3500  */
3501 int
3502 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3503            unsigned int *nbytes, struct kvec *iov, int n_vec)
3504 {
3505         struct smb_rqst rqst;
3506         int rc = 0;
3507         struct smb2_write_req *req = NULL;
3508         struct smb2_write_rsp *rsp = NULL;
3509         int resp_buftype;
3510         struct kvec rsp_iov;
3511         int flags = 0;
3512         unsigned int total_len;
3513
3514         *nbytes = 0;
3515
3516         if (n_vec < 1)
3517                 return rc;
3518
3519         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3520                              &total_len);
3521         if (rc)
3522                 return rc;
3523
3524         if (io_parms->tcon->ses->server == NULL)
3525                 return -ECONNABORTED;
3526
3527         if (smb3_encryption_required(io_parms->tcon))
3528                 flags |= CIFS_TRANSFORM_REQ;
3529
3530         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3531
3532         req->PersistentFileId = io_parms->persistent_fid;
3533         req->VolatileFileId = io_parms->volatile_fid;
3534         req->WriteChannelInfoOffset = 0;
3535         req->WriteChannelInfoLength = 0;
3536         req->Channel = 0;
3537         req->Length = cpu_to_le32(io_parms->length);
3538         req->Offset = cpu_to_le64(io_parms->offset);
3539         req->DataOffset = cpu_to_le16(
3540                                 offsetof(struct smb2_write_req, Buffer));
3541         req->RemainingBytes = 0;
3542
3543         iov[0].iov_base = (char *)req;
3544         /* 1 for Buffer */
3545         iov[0].iov_len = total_len - 1;
3546
3547         memset(&rqst, 0, sizeof(struct smb_rqst));
3548         rqst.rq_iov = iov;
3549         rqst.rq_nvec = n_vec + 1;
3550
3551         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3552                             &resp_buftype, flags, &rsp_iov);
3553         cifs_small_buf_release(req);
3554         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3555
3556         if (rc) {
3557                 trace_smb3_write_err(xid, req->PersistentFileId,
3558                                      io_parms->tcon->tid,
3559                                      io_parms->tcon->ses->Suid,
3560                                      io_parms->offset, io_parms->length, rc);
3561                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3562                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3563         } else {
3564                 *nbytes = le32_to_cpu(rsp->DataLength);
3565                 trace_smb3_write_done(xid, req->PersistentFileId,
3566                                      io_parms->tcon->tid,
3567                                      io_parms->tcon->ses->Suid,
3568                                      io_parms->offset, *nbytes);
3569         }
3570
3571         free_rsp_buf(resp_buftype, rsp);
3572         return rc;
3573 }
3574
3575 static unsigned int
3576 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3577 {
3578         int len;
3579         unsigned int entrycount = 0;
3580         unsigned int next_offset = 0;
3581         char *entryptr;
3582         FILE_DIRECTORY_INFO *dir_info;
3583
3584         if (bufstart == NULL)
3585                 return 0;
3586
3587         entryptr = bufstart;
3588
3589         while (1) {
3590                 if (entryptr + next_offset < entryptr ||
3591                     entryptr + next_offset > end_of_buf ||
3592                     entryptr + next_offset + size > end_of_buf) {
3593                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3594                         break;
3595                 }
3596
3597                 entryptr = entryptr + next_offset;
3598                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3599
3600                 len = le32_to_cpu(dir_info->FileNameLength);
3601                 if (entryptr + len < entryptr ||
3602                     entryptr + len > end_of_buf ||
3603                     entryptr + len + size > end_of_buf) {
3604                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3605                                  end_of_buf);
3606                         break;
3607                 }
3608
3609                 *lastentry = entryptr;
3610                 entrycount++;
3611
3612                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3613                 if (!next_offset)
3614                         break;
3615         }
3616
3617         return entrycount;
3618 }
3619
3620 /*
3621  * Readdir/FindFirst
3622  */
3623 int
3624 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3625                      u64 persistent_fid, u64 volatile_fid, int index,
3626                      struct cifs_search_info *srch_inf)
3627 {
3628         struct smb_rqst rqst;
3629         struct smb2_query_directory_req *req;
3630         struct smb2_query_directory_rsp *rsp = NULL;
3631         struct kvec iov[2];
3632         struct kvec rsp_iov;
3633         int rc = 0;
3634         int len;
3635         int resp_buftype = CIFS_NO_BUFFER;
3636         unsigned char *bufptr;
3637         struct TCP_Server_Info *server;
3638         struct cifs_ses *ses = tcon->ses;
3639         __le16 asteriks = cpu_to_le16('*');
3640         char *end_of_smb;
3641         unsigned int output_size = CIFSMaxBufSize;
3642         size_t info_buf_size;
3643         int flags = 0;
3644         unsigned int total_len;
3645
3646         if (ses && (ses->server))
3647                 server = ses->server;
3648         else
3649                 return -EIO;
3650
3651         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3652                              &total_len);
3653         if (rc)
3654                 return rc;
3655
3656         if (smb3_encryption_required(tcon))
3657                 flags |= CIFS_TRANSFORM_REQ;
3658
3659         switch (srch_inf->info_level) {
3660         case SMB_FIND_FILE_DIRECTORY_INFO:
3661                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3662                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3663                 break;
3664         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3665                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3666                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3667                 break;
3668         default:
3669                 cifs_dbg(VFS, "info level %u isn't supported\n",
3670                          srch_inf->info_level);
3671                 rc = -EINVAL;
3672                 goto qdir_exit;
3673         }
3674
3675         req->FileIndex = cpu_to_le32(index);
3676         req->PersistentFileId = persistent_fid;
3677         req->VolatileFileId = volatile_fid;
3678
3679         len = 0x2;
3680         bufptr = req->Buffer;
3681         memcpy(bufptr, &asteriks, len);
3682
3683         req->FileNameOffset =
3684                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3685         req->FileNameLength = cpu_to_le16(len);
3686         /*
3687          * BB could be 30 bytes or so longer if we used SMB2 specific
3688          * buffer lengths, but this is safe and close enough.
3689          */
3690         output_size = min_t(unsigned int, output_size, server->maxBuf);
3691         output_size = min_t(unsigned int, output_size, 2 << 15);
3692         req->OutputBufferLength = cpu_to_le32(output_size);
3693
3694         iov[0].iov_base = (char *)req;
3695         /* 1 for Buffer */
3696         iov[0].iov_len = total_len - 1;
3697
3698         iov[1].iov_base = (char *)(req->Buffer);
3699         iov[1].iov_len = len;
3700
3701         memset(&rqst, 0, sizeof(struct smb_rqst));
3702         rqst.rq_iov = iov;
3703         rqst.rq_nvec = 2;
3704
3705         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3706         cifs_small_buf_release(req);
3707         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3708
3709         if (rc) {
3710                 if (rc == -ENODATA &&
3711                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3712                         srch_inf->endOfSearch = true;
3713                         rc = 0;
3714                 }
3715                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3716                 goto qdir_exit;
3717         }
3718
3719         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3720                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3721                                info_buf_size);
3722         if (rc)
3723                 goto qdir_exit;
3724
3725         srch_inf->unicode = true;
3726
3727         if (srch_inf->ntwrk_buf_start) {
3728                 if (srch_inf->smallBuf)
3729                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3730                 else
3731                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3732         }
3733         srch_inf->ntwrk_buf_start = (char *)rsp;
3734         srch_inf->srch_entries_start = srch_inf->last_entry =
3735                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3736         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3737         srch_inf->entries_in_buffer =
3738                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3739                                     &srch_inf->last_entry, info_buf_size);
3740         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3741         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3742                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3743                  srch_inf->srch_entries_start, srch_inf->last_entry);
3744         if (resp_buftype == CIFS_LARGE_BUFFER)
3745                 srch_inf->smallBuf = false;
3746         else if (resp_buftype == CIFS_SMALL_BUFFER)
3747                 srch_inf->smallBuf = true;
3748         else
3749                 cifs_dbg(VFS, "illegal search buffer type\n");
3750
3751         return rc;
3752
3753 qdir_exit:
3754         free_rsp_buf(resp_buftype, rsp);
3755         return rc;
3756 }
3757
3758 int
3759 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3760                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3761                u8 info_type, u32 additional_info,
3762                 void **data, unsigned int *size)
3763 {
3764         struct smb2_set_info_req *req;
3765         struct kvec *iov = rqst->rq_iov;
3766         unsigned int i, total_len;
3767         int rc;
3768
3769         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3770         if (rc)
3771                 return rc;
3772
3773         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3774         req->InfoType = info_type;
3775         req->FileInfoClass = info_class;
3776         req->PersistentFileId = persistent_fid;
3777         req->VolatileFileId = volatile_fid;
3778         req->AdditionalInformation = cpu_to_le32(additional_info);
3779
3780         req->BufferOffset =
3781                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3782         req->BufferLength = cpu_to_le32(*size);
3783
3784         memcpy(req->Buffer, *data, *size);
3785         total_len += *size;
3786
3787         iov[0].iov_base = (char *)req;
3788         /* 1 for Buffer */
3789         iov[0].iov_len = total_len - 1;
3790
3791         for (i = 1; i < rqst->rq_nvec; i++) {
3792                 le32_add_cpu(&req->BufferLength, size[i]);
3793                 iov[i].iov_base = (char *)data[i];
3794                 iov[i].iov_len = size[i];
3795         }
3796
3797         return 0;
3798 }
3799
3800 void
3801 SMB2_set_info_free(struct smb_rqst *rqst)
3802 {
3803         cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3804 }
3805
3806 static int
3807 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3808                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3809                u8 info_type, u32 additional_info, unsigned int num,
3810                 void **data, unsigned int *size)
3811 {
3812         struct smb_rqst rqst;
3813         struct smb2_set_info_rsp *rsp = NULL;
3814         struct kvec *iov;
3815         struct kvec rsp_iov;
3816         int rc = 0;
3817         int resp_buftype;
3818         struct cifs_ses *ses = tcon->ses;
3819         int flags = 0;
3820
3821         if (!ses || !(ses->server))
3822                 return -EIO;
3823
3824         if (!num)
3825                 return -EINVAL;
3826
3827         if (smb3_encryption_required(tcon))
3828                 flags |= CIFS_TRANSFORM_REQ;
3829
3830         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3831         if (!iov)
3832                 return -ENOMEM;
3833
3834         memset(&rqst, 0, sizeof(struct smb_rqst));
3835         rqst.rq_iov = iov;
3836         rqst.rq_nvec = num;
3837
3838         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3839                                 info_class, info_type, additional_info,
3840                                 data, size);
3841         if (rc) {
3842                 kfree(iov);
3843                 return rc;
3844         }
3845
3846
3847         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3848                             &rsp_iov);
3849         SMB2_set_info_free(&rqst);
3850         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3851
3852         if (rc != 0) {
3853                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3854                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3855                                 ses->Suid, info_class, (__u32)info_type, rc);
3856         }
3857
3858         free_rsp_buf(resp_buftype, rsp);
3859         kfree(iov);
3860         return rc;
3861 }
3862
3863 int
3864 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3865              u64 volatile_fid, u32 pid, __le64 *eof)
3866 {
3867         struct smb2_file_eof_info info;
3868         void *data;
3869         unsigned int size;
3870
3871         info.EndOfFile = *eof;
3872
3873         data = &info;
3874         size = sizeof(struct smb2_file_eof_info);
3875
3876         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3877                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3878                         0, 1, &data, &size);
3879 }
3880
3881 int
3882 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3883                 u64 persistent_fid, u64 volatile_fid,
3884                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3885 {
3886         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3887                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3888                         1, (void **)&pnntsd, &pacllen);
3889 }
3890
3891 int
3892 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3893             u64 persistent_fid, u64 volatile_fid,
3894             struct smb2_file_full_ea_info *buf, int len)
3895 {
3896         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3897                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3898                 0, 1, (void **)&buf, &len);
3899 }
3900
3901 int
3902 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3903                   const u64 persistent_fid, const u64 volatile_fid,
3904                   __u8 oplock_level)
3905 {
3906         struct smb_rqst rqst;
3907         int rc;
3908         struct smb2_oplock_break *req = NULL;
3909         struct cifs_ses *ses = tcon->ses;
3910         int flags = CIFS_OBREAK_OP;
3911         unsigned int total_len;
3912         struct kvec iov[1];
3913         struct kvec rsp_iov;
3914         int resp_buf_type;
3915
3916         cifs_dbg(FYI, "SMB2_oplock_break\n");
3917         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3918                              &total_len);
3919         if (rc)
3920                 return rc;
3921
3922         if (smb3_encryption_required(tcon))
3923                 flags |= CIFS_TRANSFORM_REQ;
3924
3925         req->VolatileFid = volatile_fid;
3926         req->PersistentFid = persistent_fid;
3927         req->OplockLevel = oplock_level;
3928         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3929
3930         flags |= CIFS_NO_RESP;
3931
3932         iov[0].iov_base = (char *)req;
3933         iov[0].iov_len = total_len;
3934
3935         memset(&rqst, 0, sizeof(struct smb_rqst));
3936         rqst.rq_iov = iov;
3937         rqst.rq_nvec = 1;
3938
3939         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3940         cifs_small_buf_release(req);
3941
3942         if (rc) {
3943                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3944                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3945         }
3946
3947         return rc;
3948 }
3949
3950 void
3951 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3952                              struct kstatfs *kst)
3953 {
3954         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3955                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3956         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3957         kst->f_bfree  = kst->f_bavail =
3958                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3959         return;
3960 }
3961
3962 static void
3963 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
3964                         struct kstatfs *kst)
3965 {
3966         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
3967         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
3968         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
3969         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
3970                 kst->f_bavail = kst->f_bfree;
3971         else
3972                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
3973         if (response_data->TotalFileNodes != cpu_to_le64(-1))
3974                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
3975         if (response_data->FreeFileNodes != cpu_to_le64(-1))
3976                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
3977
3978         return;
3979 }
3980
3981 static int
3982 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3983                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3984 {
3985         struct TCP_Server_Info *server;
3986         int rc;
3987         struct smb2_query_info_req *req;
3988         unsigned int total_len;
3989
3990         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3991
3992         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3993                 return -EIO;
3994
3995         server = tcon->ses->server;
3996
3997         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3998                              &total_len);
3999         if (rc)
4000                 return rc;
4001
4002         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4003         req->FileInfoClass = level;
4004         req->PersistentFileId = persistent_fid;
4005         req->VolatileFileId = volatile_fid;
4006         /* 1 for pad */
4007         req->InputBufferOffset =
4008                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4009         req->OutputBufferLength = cpu_to_le32(
4010                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4011
4012         iov->iov_base = (char *)req;
4013         iov->iov_len = total_len;
4014         return 0;
4015 }
4016
4017 int
4018 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4019               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4020 {
4021         struct smb_rqst rqst;
4022         struct smb2_query_info_rsp *rsp = NULL;
4023         struct kvec iov;
4024         struct kvec rsp_iov;
4025         int rc = 0;
4026         int resp_buftype;
4027         struct cifs_ses *ses = tcon->ses;
4028         FILE_SYSTEM_POSIX_INFO *info = NULL;
4029         int flags = 0;
4030
4031         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4032                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4033                                 persistent_fid, volatile_fid);
4034         if (rc)
4035                 return rc;
4036
4037         if (smb3_encryption_required(tcon))
4038                 flags |= CIFS_TRANSFORM_REQ;
4039
4040         memset(&rqst, 0, sizeof(struct smb_rqst));
4041         rqst.rq_iov = &iov;
4042         rqst.rq_nvec = 1;
4043
4044         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4045         cifs_small_buf_release(iov.iov_base);
4046         if (rc) {
4047                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4048                 goto posix_qfsinf_exit;
4049         }
4050         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4051
4052         info = (FILE_SYSTEM_POSIX_INFO *)(
4053                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4054         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4055                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4056                                sizeof(FILE_SYSTEM_POSIX_INFO));
4057         if (!rc)
4058                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4059
4060 posix_qfsinf_exit:
4061         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4062         return rc;
4063 }
4064
4065 int
4066 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4067               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4068 {
4069         struct smb_rqst rqst;
4070         struct smb2_query_info_rsp *rsp = NULL;
4071         struct kvec iov;
4072         struct kvec rsp_iov;
4073         int rc = 0;
4074         int resp_buftype;
4075         struct cifs_ses *ses = tcon->ses;
4076         struct smb2_fs_full_size_info *info = NULL;
4077         int flags = 0;
4078
4079         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4080                                 sizeof(struct smb2_fs_full_size_info),
4081                                 persistent_fid, volatile_fid);
4082         if (rc)
4083                 return rc;
4084
4085         if (smb3_encryption_required(tcon))
4086                 flags |= CIFS_TRANSFORM_REQ;
4087
4088         memset(&rqst, 0, sizeof(struct smb_rqst));
4089         rqst.rq_iov = &iov;
4090         rqst.rq_nvec = 1;
4091
4092         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4093         cifs_small_buf_release(iov.iov_base);
4094         if (rc) {
4095                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4096                 goto qfsinf_exit;
4097         }
4098         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4099
4100         info = (struct smb2_fs_full_size_info *)(
4101                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4102         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4103                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4104                                sizeof(struct smb2_fs_full_size_info));
4105         if (!rc)
4106                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4107
4108 qfsinf_exit:
4109         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4110         return rc;
4111 }
4112
4113 int
4114 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4115               u64 persistent_fid, u64 volatile_fid, int level)
4116 {
4117         struct smb_rqst rqst;
4118         struct smb2_query_info_rsp *rsp = NULL;
4119         struct kvec iov;
4120         struct kvec rsp_iov;
4121         int rc = 0;
4122         int resp_buftype, max_len, min_len;
4123         struct cifs_ses *ses = tcon->ses;
4124         unsigned int rsp_len, offset;
4125         int flags = 0;
4126
4127         if (level == FS_DEVICE_INFORMATION) {
4128                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4129                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4130         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4131                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4132                 min_len = MIN_FS_ATTR_INFO_SIZE;
4133         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4134                 max_len = sizeof(struct smb3_fs_ss_info);
4135                 min_len = sizeof(struct smb3_fs_ss_info);
4136         } else if (level == FS_VOLUME_INFORMATION) {
4137                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4138                 min_len = sizeof(struct smb3_fs_vol_info);
4139         } else {
4140                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4141                 return -EINVAL;
4142         }
4143
4144         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4145                                 persistent_fid, volatile_fid);
4146         if (rc)
4147                 return rc;
4148
4149         if (smb3_encryption_required(tcon))
4150                 flags |= CIFS_TRANSFORM_REQ;
4151
4152         memset(&rqst, 0, sizeof(struct smb_rqst));
4153         rqst.rq_iov = &iov;
4154         rqst.rq_nvec = 1;
4155
4156         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4157         cifs_small_buf_release(iov.iov_base);
4158         if (rc) {
4159                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4160                 goto qfsattr_exit;
4161         }
4162         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4163
4164         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4165         offset = le16_to_cpu(rsp->OutputBufferOffset);
4166         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4167         if (rc)
4168                 goto qfsattr_exit;
4169
4170         if (level == FS_ATTRIBUTE_INFORMATION)
4171                 memcpy(&tcon->fsAttrInfo, offset
4172                         + (char *)rsp, min_t(unsigned int,
4173                         rsp_len, max_len));
4174         else if (level == FS_DEVICE_INFORMATION)
4175                 memcpy(&tcon->fsDevInfo, offset
4176                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4177         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4178                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4179                         (offset + (char *)rsp);
4180                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4181                 tcon->perf_sector_size =
4182                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4183         } else if (level == FS_VOLUME_INFORMATION) {
4184                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4185                         (offset + (char *)rsp);
4186                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4187                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4188         }
4189
4190 qfsattr_exit:
4191         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4192         return rc;
4193 }
4194
4195 int
4196 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4197            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4198            const __u32 num_lock, struct smb2_lock_element *buf)
4199 {
4200         struct smb_rqst rqst;
4201         int rc = 0;
4202         struct smb2_lock_req *req = NULL;
4203         struct kvec iov[2];
4204         struct kvec rsp_iov;
4205         int resp_buf_type;
4206         unsigned int count;
4207         int flags = CIFS_NO_RESP;
4208         unsigned int total_len;
4209
4210         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4211
4212         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4213         if (rc)
4214                 return rc;
4215
4216         if (smb3_encryption_required(tcon))
4217                 flags |= CIFS_TRANSFORM_REQ;
4218
4219         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4220         req->LockCount = cpu_to_le16(num_lock);
4221
4222         req->PersistentFileId = persist_fid;
4223         req->VolatileFileId = volatile_fid;
4224
4225         count = num_lock * sizeof(struct smb2_lock_element);
4226
4227         iov[0].iov_base = (char *)req;
4228         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4229         iov[1].iov_base = (char *)buf;
4230         iov[1].iov_len = count;
4231
4232         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4233
4234         memset(&rqst, 0, sizeof(struct smb_rqst));
4235         rqst.rq_iov = iov;
4236         rqst.rq_nvec = 2;
4237
4238         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4239                             &rsp_iov);
4240         cifs_small_buf_release(req);
4241         if (rc) {
4242                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4243                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4244                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4245                                     tcon->ses->Suid, rc);
4246         }
4247
4248         return rc;
4249 }
4250
4251 int
4252 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4253           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4254           const __u64 length, const __u64 offset, const __u32 lock_flags,
4255           const bool wait)
4256 {
4257         struct smb2_lock_element lock;
4258
4259         lock.Offset = cpu_to_le64(offset);
4260         lock.Length = cpu_to_le64(length);
4261         lock.Flags = cpu_to_le32(lock_flags);
4262         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4263                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4264
4265         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4266 }
4267
4268 int
4269 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4270                  __u8 *lease_key, const __le32 lease_state)
4271 {
4272         struct smb_rqst rqst;
4273         int rc;
4274         struct smb2_lease_ack *req = NULL;
4275         struct cifs_ses *ses = tcon->ses;
4276         int flags = CIFS_OBREAK_OP;
4277         unsigned int total_len;
4278         struct kvec iov[1];
4279         struct kvec rsp_iov;
4280         int resp_buf_type;
4281         __u64 *please_key_high;
4282         __u64 *please_key_low;
4283
4284         cifs_dbg(FYI, "SMB2_lease_break\n");
4285         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4286                              &total_len);
4287         if (rc)
4288                 return rc;
4289
4290         if (smb3_encryption_required(tcon))
4291                 flags |= CIFS_TRANSFORM_REQ;
4292
4293         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4294         req->StructureSize = cpu_to_le16(36);
4295         total_len += 12;
4296
4297         memcpy(req->LeaseKey, lease_key, 16);
4298         req->LeaseState = lease_state;
4299
4300         flags |= CIFS_NO_RESP;
4301
4302         iov[0].iov_base = (char *)req;
4303         iov[0].iov_len = total_len;
4304
4305         memset(&rqst, 0, sizeof(struct smb_rqst));
4306         rqst.rq_iov = iov;
4307         rqst.rq_nvec = 1;
4308
4309         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4310         cifs_small_buf_release(req);
4311
4312         please_key_low = (__u64 *)req->LeaseKey;
4313         please_key_high = (__u64 *)(req->LeaseKey+8);
4314         if (rc) {
4315                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4316                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4317                         ses->Suid, *please_key_low, *please_key_high, rc);
4318                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4319         } else
4320                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4321                         ses->Suid, *please_key_low, *please_key_high);
4322
4323         return rc;
4324 }