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 static 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 #ifdef CONFIG_CIFS_STATS2
 364                 uint16_t com_code = le16_to_cpu(smb2_command);
 365                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 366 #endif
 367                 cifs_stats_inc(&tcon->num_smbs_sent);
 368         }
 369
 370         return rc;
 371 }
 372
 373 #ifdef CONFIG_CIFS_SMB311
 374 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 375 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 376
 377
 378 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 379 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 380 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 381
 382 static void
 383 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 384 {
 385         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 386         pneg_ctxt->DataLength = cpu_to_le16(38);
 387         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 388         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 389         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 390         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 391 }
 392
 393 static void
 394 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 395 {
 396         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 397         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 398         pneg_ctxt->CipherCount = cpu_to_le16(1);
 399 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 400         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 401 }
 402
 403 static void
 404 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 405 {
 406         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 407         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 408 }
 409
 410 static void
 411 assemble_neg_contexts(struct smb2_negotiate_req *req,
 412                       unsigned int *total_len)
 413 {
 414         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 415         unsigned int ctxt_len;
 416
 417         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 418         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 419         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 420         *total_len += ctxt_len;
 421         pneg_ctxt += ctxt_len;
 422
 423         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 424         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 425         *total_len += ctxt_len;
 426         pneg_ctxt += ctxt_len;
 427
 428         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 429         *total_len += sizeof(struct smb2_posix_neg_context);
 430
 431         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 432         req->NegotiateContextCount = cpu_to_le16(3);
 433 }
 434
 435 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 436 {
 437         unsigned int len = le16_to_cpu(ctxt->DataLength);
 438
 439         /* If invalid preauth context warn but use what we requested, SHA-512 */
 440         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 441                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 442                 return;
 443         }
 444         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 445                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 446         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 447                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 448 }
 449
 450 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 451                               struct smb2_encryption_neg_context *ctxt)
 452 {
 453         unsigned int len = le16_to_cpu(ctxt->DataLength);
 454
 455         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 456         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 457                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 458                 return -EINVAL;
 459         }
 460
 461         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 462                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 463                 return -EINVAL;
 464         }
 465         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 466         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 467             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 468                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 469                 return -EINVAL;
 470         }
 471         server->cipher_type = ctxt->Ciphers[0];
 472         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 473         return 0;
 474 }
 475
 476 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 477                                      struct TCP_Server_Info *server,
 478                                      unsigned int len_of_smb)
 479 {
 480         struct smb2_neg_context *pctx;
 481         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 482         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 483         unsigned int len_of_ctxts, i;
 484         int rc = 0;
 485
 486         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 487         if (len_of_smb <= offset) {
 488                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 489                 return -EINVAL;
 490         }
 491
 492         len_of_ctxts = len_of_smb - offset;
 493
 494         for (i = 0; i < ctxt_cnt; i++) {
 495                 int clen;
 496                 /* check that offset is not beyond end of SMB */
 497                 if (len_of_ctxts == 0)
 498                         break;
 499
 500                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 501                         break;
 502
 503                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 504                 clen = le16_to_cpu(pctx->DataLength);
 505                 if (clen > len_of_ctxts)
 506                         break;
 507
 508                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 509                         decode_preauth_context(
 510                                 (struct smb2_preauth_neg_context *)pctx);
 511                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 512                         rc = decode_encrypt_ctx(server,
 513                                 (struct smb2_encryption_neg_context *)pctx);
 514                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 515                         server->posix_ext_supported = true;
 516                 else
 517                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 518                                 le16_to_cpu(pctx->ContextType));
 519
 520                 if (rc)
 521                         break;
 522                 /* offsets must be 8 byte aligned */
 523                 clen = (clen + 7) & ~0x7;
 524                 offset += clen + sizeof(struct smb2_neg_context);
 525                 len_of_ctxts -= clen;
 526         }
 527         return rc;
 528 }
 529
 530 static struct create_posix *
 531 create_posix_buf(umode_t mode)
 532 {
 533         struct create_posix *buf;
 534
 535         buf = kzalloc(sizeof(struct create_posix),
 536                         GFP_KERNEL);
 537         if (!buf)
 538                 return NULL;
 539
 540         buf->ccontext.DataOffset =
 541                 cpu_to_le16(offsetof(struct create_posix, Mode));
 542         buf->ccontext.DataLength = cpu_to_le32(4);
 543         buf->ccontext.NameOffset =
 544                 cpu_to_le16(offsetof(struct create_posix, Name));
 545         buf->ccontext.NameLength = cpu_to_le16(16);
 546
 547         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 548         buf->Name[0] = 0x93;
 549         buf->Name[1] = 0xAD;
 550         buf->Name[2] = 0x25;
 551         buf->Name[3] = 0x50;
 552         buf->Name[4] = 0x9C;
 553         buf->Name[5] = 0xB4;
 554         buf->Name[6] = 0x11;
 555         buf->Name[7] = 0xE7;
 556         buf->Name[8] = 0xB4;
 557         buf->Name[9] = 0x23;
 558         buf->Name[10] = 0x83;
 559         buf->Name[11] = 0xDE;
 560         buf->Name[12] = 0x96;
 561         buf->Name[13] = 0x8B;
 562         buf->Name[14] = 0xCD;
 563         buf->Name[15] = 0x7C;
 564         buf->Mode = cpu_to_le32(mode);
 565         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 566         return buf;
 567 }
 568
 569 static int
 570 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 571 {
 572         struct smb2_create_req *req = iov[0].iov_base;
 573         unsigned int num = *num_iovec;
 574
 575         iov[num].iov_base = create_posix_buf(mode);
 576         if (iov[num].iov_base == NULL)
 577                 return -ENOMEM;
 578         iov[num].iov_len = sizeof(struct create_posix);
 579         if (!req->CreateContextsOffset)
 580                 req->CreateContextsOffset = cpu_to_le32(
 581                                 sizeof(struct smb2_create_req) +
 582                                 iov[num - 1].iov_len);
 583         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 584         *num_iovec = num + 1;
 585         return 0;
 586 }
 587
 588 #else
 589 static void assemble_neg_contexts(struct smb2_negotiate_req *req,
 590                                   unsigned int *total_len)
 591 {
 592         return;
 593 }
 594 #endif /* SMB311 */
 595
 596 /*
 597  *
 598  *      SMB2 Worker functions follow:
 599  *
 600  *      The general structure of the worker functions is:
 601  *      1) Call smb2_init (assembles SMB2 header)
 602  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 603  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 604  *      4) Decode SMB2 command specific fields in the fixed length area
 605  *      5) Decode variable length data area (if any for this SMB2 command type)
 606  *      6) Call free smb buffer
 607  *      7) return
 608  *
 609  */
 610
 611 int
 612 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 613 {
 614         struct smb_rqst rqst;
 615         struct smb2_negotiate_req *req;
 616         struct smb2_negotiate_rsp *rsp;
 617         struct kvec iov[1];
 618         struct kvec rsp_iov;
 619         int rc = 0;
 620         int resp_buftype;
 621         struct TCP_Server_Info *server = ses->server;
 622         int blob_offset, blob_length;
 623         char *security_blob;
 624         int flags = CIFS_NEG_OP;
 625         unsigned int total_len;
 626
 627         cifs_dbg(FYI, "Negotiate protocol\n");
 628
 629         if (!server) {
 630                 WARN(1, "%s: server is NULL!\n", __func__);
 631                 return -EIO;
 632         }
 633
 634         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 635         if (rc)
 636                 return rc;
 637
 638         req->sync_hdr.SessionId = 0;
 639 #ifdef CONFIG_CIFS_SMB311
 640         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 641         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 642 #endif
 643
 644         if (strcmp(ses->server->vals->version_string,
 645                    SMB3ANY_VERSION_STRING) == 0) {
 646                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 647                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 648                 req->DialectCount = cpu_to_le16(2);
 649                 total_len += 4;
 650         } else if (strcmp(ses->server->vals->version_string,
 651                    SMBDEFAULT_VERSION_STRING) == 0) {
 652                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 653                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 654                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 655                 req->DialectCount = cpu_to_le16(3);
 656                 total_len += 6;
 657         } else {
 658                 /* otherwise send specific dialect */
 659                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 660                 req->DialectCount = cpu_to_le16(1);
 661                 total_len += 2;
 662         }
 663
 664         /* only one of SMB2 signing flags may be set in SMB2 request */
 665         if (ses->sign)
 666                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 667         else if (global_secflags & CIFSSEC_MAY_SIGN)
 668                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 669         else
 670                 req->SecurityMode = 0;
 671
 672         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 673
 674         /* ClientGUID must be zero for SMB2.02 dialect */
 675         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 676                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 677         else {
 678                 memcpy(req->ClientGUID, server->client_guid,
 679                         SMB2_CLIENT_GUID_SIZE);
 680                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 681                         assemble_neg_contexts(req, &total_len);
 682         }
 683         iov[0].iov_base = (char *)req;
 684         iov[0].iov_len = total_len;
 685
 686         memset(&rqst, 0, sizeof(struct smb_rqst));
 687         rqst.rq_iov = iov;
 688         rqst.rq_nvec = 1;
 689
 690         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 691         cifs_small_buf_release(req);
 692         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 693         /*
 694          * No tcon so can't do
 695          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 696          */
 697         if (rc == -EOPNOTSUPP) {
 698                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 699                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 700                         " older servers\n");
 701                 goto neg_exit;
 702         } else if (rc != 0)
 703                 goto neg_exit;
 704
 705         if (strcmp(ses->server->vals->version_string,
 706                    SMB3ANY_VERSION_STRING) == 0) {
 707                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 708                         cifs_dbg(VFS,
 709                                 "SMB2 dialect returned but not requested\n");
 710                         return -EIO;
 711                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 712                         cifs_dbg(VFS,
 713                                 "SMB2.1 dialect returned but not requested\n");
 714                         return -EIO;
 715                 }
 716         } else if (strcmp(ses->server->vals->version_string,
 717                    SMBDEFAULT_VERSION_STRING) == 0) {
 718                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 719                         cifs_dbg(VFS,
 720                                 "SMB2 dialect returned but not requested\n");
 721                         return -EIO;
 722                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 723                         /* ops set to 3.0 by default for default so update */
 724                         ses->server->ops = &smb21_operations;
 725                 }
 726         } else if (le16_to_cpu(rsp->DialectRevision) !=
 727                                 ses->server->vals->protocol_id) {
 728                 /* if requested single dialect ensure returned dialect matched */
 729                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 730                         le16_to_cpu(rsp->DialectRevision));
 731                 return -EIO;
 732         }
 733
 734         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 735
 736         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 737                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 738         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 739                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 740         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 741                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 742         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 743                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 744 #ifdef CONFIG_CIFS_SMB311
 745         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 746                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 747 #endif /* SMB311 */
 748         else {
 749                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 750                          le16_to_cpu(rsp->DialectRevision));
 751                 rc = -EIO;
 752                 goto neg_exit;
 753         }
 754         server->dialect = le16_to_cpu(rsp->DialectRevision);
 755
 756         /* BB: add check that dialect was valid given dialect(s) we asked for */
 757
 758 #ifdef CONFIG_CIFS_SMB311
 759         /*
 760          * Keep a copy of the hash after negprot. This hash will be
 761          * the starting hash value for all sessions made from this
 762          * server.
 763          */
 764         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 765                SMB2_PREAUTH_HASH_SIZE);
 766 #endif
 767         /* SMB2 only has an extended negflavor */
 768         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 769         /* set it to the maximum buffer size value we can send with 1 credit */
 770         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 771                                SMB2_MAX_BUFFER_SIZE);
 772         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 773         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 774         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 775         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 776                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 777                                 server->sec_mode);
 778         server->capabilities = le32_to_cpu(rsp->Capabilities);
 779         /* Internal types */
 780         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 781
 782         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 783                                                (struct smb2_sync_hdr *)rsp);
 784         /*
 785          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 786          * for us will be
 787          *      ses->sectype = RawNTLMSSP;
 788          * but for time being this is our only auth choice so doesn't matter.
 789          * We just found a server which sets blob length to zero expecting raw.
 790          */
 791         if (blob_length == 0) {
 792                 cifs_dbg(FYI, "missing security blob on negprot\n");
 793                 server->sec_ntlmssp = true;
 794         }
 795
 796         rc = cifs_enable_signing(server, ses->sign);
 797         if (rc)
 798                 goto neg_exit;
 799         if (blob_length) {
 800                 rc = decode_negTokenInit(security_blob, blob_length, server);
 801                 if (rc == 1)
 802                         rc = 0;
 803                 else if (rc == 0)
 804                         rc = -EIO;
 805         }
 806
 807 #ifdef CONFIG_CIFS_SMB311
 808         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 809                 if (rsp->NegotiateContextCount)
 810                         rc = smb311_decode_neg_context(rsp, server,
 811                                                        rsp_iov.iov_len);
 812                 else
 813                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 814         }
 815 #endif /* CONFIG_CIFS_SMB311 */
 816 neg_exit:
 817         free_rsp_buf(resp_buftype, rsp);
 818         return rc;
 819 }
 820
 821 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 822 {
 823         int rc;
 824         struct validate_negotiate_info_req *pneg_inbuf;
 825         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 826         u32 rsplen;
 827         u32 inbuflen; /* max of 4 dialects */
 828
 829         cifs_dbg(FYI, "validate negotiate\n");
 830
 831         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 832         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 833                 return 0;
 834
 835         /*
 836          * validation ioctl must be signed, so no point sending this if we
 837          * can not sign it (ie are not known user).  Even if signing is not
 838          * required (enabled but not negotiated), in those cases we selectively
 839          * sign just this, the first and only signed request on a connection.
 840          * Having validation of negotiate info  helps reduce attack vectors.
 841          */
 842         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 843                 return 0; /* validation requires signing */
 844
 845         if (tcon->ses->user_name == NULL) {
 846                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 847                 return 0; /* validation requires signing */
 848         }
 849
 850         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 851                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 852
 853         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 854         if (!pneg_inbuf)
 855                 return -ENOMEM;
 856
 857         pneg_inbuf->Capabilities =
 858                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 859         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 860                                         SMB2_CLIENT_GUID_SIZE);
 861
 862         if (tcon->ses->sign)
 863                 pneg_inbuf->SecurityMode =
 864                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 865         else if (global_secflags & CIFSSEC_MAY_SIGN)
 866                 pneg_inbuf->SecurityMode =
 867                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 868         else
 869                 pneg_inbuf->SecurityMode = 0;
 870
 871
 872         if (strcmp(tcon->ses->server->vals->version_string,
 873                 SMB3ANY_VERSION_STRING) == 0) {
 874                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 875                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 876                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 877                 /* structure is big enough for 3 dialects, sending only 2 */
 878                 inbuflen = sizeof(*pneg_inbuf) -
 879                                 sizeof(pneg_inbuf->Dialects[0]);
 880         } else if (strcmp(tcon->ses->server->vals->version_string,
 881                 SMBDEFAULT_VERSION_STRING) == 0) {
 882                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 883                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 884                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 885                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 886                 /* structure is big enough for 3 dialects */
 887                 inbuflen = sizeof(*pneg_inbuf);
 888         } else {
 889                 /* otherwise specific dialect was requested */
 890                 pneg_inbuf->Dialects[0] =
 891                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 892                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 893                 /* structure is big enough for 3 dialects, sending only 1 */
 894                 inbuflen = sizeof(*pneg_inbuf) -
 895                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 896         }
 897
 898         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 899                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 900                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 901
 902         if (rc != 0) {
 903                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 904                 rc = -EIO;
 905                 goto out_free_inbuf;
 906         }
 907
 908         rc = -EIO;
 909         if (rsplen != sizeof(*pneg_rsp)) {
 910                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 911                          rsplen);
 912
 913                 /* relax check since Mac returns max bufsize allowed on ioctl */
 914                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 915                         goto out_free_rsp;
 916         }
 917
 918         /* check validate negotiate info response matches what we got earlier */
 919         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 920                 goto vneg_out;
 921
 922         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 923                 goto vneg_out;
 924
 925         /* do not validate server guid because not saved at negprot time yet */
 926
 927         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 928               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 929                 goto vneg_out;
 930
 931         /* validate negotiate successful */
 932         rc = 0;
 933         cifs_dbg(FYI, "validate negotiate info successful\n");
 934         goto out_free_rsp;
 935
 936 vneg_out:
 937         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 938 out_free_rsp:
 939         kfree(pneg_rsp);
 940 out_free_inbuf:
 941         kfree(pneg_inbuf);
 942         return rc;
 943 }
 944
 945 enum securityEnum
 946 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 947 {
 948         switch (requested) {
 949         case Kerberos:
 950         case RawNTLMSSP:
 951                 return requested;
 952         case NTLMv2:
 953                 return RawNTLMSSP;
 954         case Unspecified:
 955                 if (server->sec_ntlmssp &&
 956                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 957                         return RawNTLMSSP;
 958                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 959                         (global_secflags & CIFSSEC_MAY_KRB5))
 960                         return Kerberos;
 961                 /* Fallthrough */
 962         default:
 963                 return Unspecified;
 964         }
 965 }
 966
 967 struct SMB2_sess_data {
 968         unsigned int xid;
 969         struct cifs_ses *ses;
 970         struct nls_table *nls_cp;
 971         void (*func)(struct SMB2_sess_data *);
 972         int result;
 973         u64 previous_session;
 974
 975         /* we will send the SMB in three pieces:
 976          * a fixed length beginning part, an optional
 977          * SPNEGO blob (which can be zero length), and a
 978          * last part which will include the strings
 979          * and rest of bcc area. This allows us to avoid
 980          * a large buffer 17K allocation
 981          */
 982         int buf0_type;
 983         struct kvec iov[2];
 984 };
 985
 986 static int
 987 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 988 {
 989         int rc;
 990         struct cifs_ses *ses = sess_data->ses;
 991         struct smb2_sess_setup_req *req;
 992         struct TCP_Server_Info *server = ses->server;
 993         unsigned int total_len;
 994
 995         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 996                              &total_len);
 997         if (rc)
 998                 return rc;
 999
1000         /* First session, not a reauthenticate */
1001         req->sync_hdr.SessionId = 0;
1002
1003         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1004         req->PreviousSessionId = sess_data->previous_session;
1005
1006         req->Flags = 0; /* MBZ */
1007
1008         /* enough to enable echos and oplocks and one max size write */
1009         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1010
1011         /* only one of SMB2 signing flags may be set in SMB2 request */
1012         if (server->sign)
1013                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1014         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1015                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1016         else
1017                 req->SecurityMode = 0;
1018
1019         req->Capabilities = 0;
1020         req->Channel = 0; /* MBZ */
1021
1022         sess_data->iov[0].iov_base = (char *)req;
1023         /* 1 for pad */
1024         sess_data->iov[0].iov_len = total_len - 1;
1025         /*
1026          * This variable will be used to clear the buffer
1027          * allocated above in case of any error in the calling function.
1028          */
1029         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1030
1031         return 0;
1032 }
1033
1034 static void
1035 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1036 {
1037         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1038         sess_data->buf0_type = CIFS_NO_BUFFER;
1039 }
1040
1041 static int
1042 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1043 {
1044         int rc;
1045         struct smb_rqst rqst;
1046         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1047         struct kvec rsp_iov = { NULL, 0 };
1048
1049         /* Testing shows that buffer offset must be at location of Buffer[0] */
1050         req->SecurityBufferOffset =
1051                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1052         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1053
1054         memset(&rqst, 0, sizeof(struct smb_rqst));
1055         rqst.rq_iov = sess_data->iov;
1056         rqst.rq_nvec = 2;
1057
1058         /* BB add code to build os and lm fields */
1059         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1060                             &rqst,
1061                             &sess_data->buf0_type,
1062                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1063         cifs_small_buf_release(sess_data->iov[0].iov_base);
1064         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1065
1066         return rc;
1067 }
1068
1069 static int
1070 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1071 {
1072         int rc = 0;
1073         struct cifs_ses *ses = sess_data->ses;
1074
1075         mutex_lock(&ses->server->srv_mutex);
1076         if (ses->server->ops->generate_signingkey) {
1077                 rc = ses->server->ops->generate_signingkey(ses);
1078                 if (rc) {
1079                         cifs_dbg(FYI,
1080                                 "SMB3 session key generation failed\n");
1081                         mutex_unlock(&ses->server->srv_mutex);
1082                         return rc;
1083                 }
1084         }
1085         if (!ses->server->session_estab) {
1086                 ses->server->sequence_number = 0x2;
1087                 ses->server->session_estab = true;
1088         }
1089         mutex_unlock(&ses->server->srv_mutex);
1090
1091         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1092         spin_lock(&GlobalMid_Lock);
1093         ses->status = CifsGood;
1094         ses->need_reconnect = false;
1095         spin_unlock(&GlobalMid_Lock);
1096         return rc;
1097 }
1098
1099 #ifdef CONFIG_CIFS_UPCALL
1100 static void
1101 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1102 {
1103         int rc;
1104         struct cifs_ses *ses = sess_data->ses;
1105         struct cifs_spnego_msg *msg;
1106         struct key *spnego_key = NULL;
1107         struct smb2_sess_setup_rsp *rsp = NULL;
1108
1109         rc = SMB2_sess_alloc_buffer(sess_data);
1110         if (rc)
1111                 goto out;
1112
1113         spnego_key = cifs_get_spnego_key(ses);
1114         if (IS_ERR(spnego_key)) {
1115                 rc = PTR_ERR(spnego_key);
1116                 spnego_key = NULL;
1117                 goto out;
1118         }
1119
1120         msg = spnego_key->payload.data[0];
1121         /*
1122          * check version field to make sure that cifs.upcall is
1123          * sending us a response in an expected form
1124          */
1125         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1126                 cifs_dbg(VFS,
1127                           "bad cifs.upcall version. Expected %d got %d",
1128                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1129                 rc = -EKEYREJECTED;
1130                 goto out_put_spnego_key;
1131         }
1132
1133         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1134                                          GFP_KERNEL);
1135         if (!ses->auth_key.response) {
1136                 cifs_dbg(VFS,
1137                         "Kerberos can't allocate (%u bytes) memory",
1138                         msg->sesskey_len);
1139                 rc = -ENOMEM;
1140                 goto out_put_spnego_key;
1141         }
1142         ses->auth_key.len = msg->sesskey_len;
1143
1144         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1145         sess_data->iov[1].iov_len = msg->secblob_len;
1146
1147         rc = SMB2_sess_sendreceive(sess_data);
1148         if (rc)
1149                 goto out_put_spnego_key;
1150
1151         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1152         ses->Suid = rsp->sync_hdr.SessionId;
1153
1154         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1155
1156         rc = SMB2_sess_establish_session(sess_data);
1157 out_put_spnego_key:
1158         key_invalidate(spnego_key);
1159         key_put(spnego_key);
1160 out:
1161         sess_data->result = rc;
1162         sess_data->func = NULL;
1163         SMB2_sess_free_buffer(sess_data);
1164 }
1165 #else
1166 static void
1167 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1168 {
1169         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1170         sess_data->result = -EOPNOTSUPP;
1171         sess_data->func = NULL;
1172 }
1173 #endif
1174
1175 static void
1176 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1177
1178 static void
1179 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1180 {
1181         int rc;
1182         struct cifs_ses *ses = sess_data->ses;
1183         struct smb2_sess_setup_rsp *rsp = NULL;
1184         char *ntlmssp_blob = NULL;
1185         bool use_spnego = false; /* else use raw ntlmssp */
1186         u16 blob_length = 0;
1187
1188         /*
1189          * If memory allocation is successful, caller of this function
1190          * frees it.
1191          */
1192         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1193         if (!ses->ntlmssp) {
1194                 rc = -ENOMEM;
1195                 goto out_err;
1196         }
1197         ses->ntlmssp->sesskey_per_smbsess = true;
1198
1199         rc = SMB2_sess_alloc_buffer(sess_data);
1200         if (rc)
1201                 goto out_err;
1202
1203         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1204                                GFP_KERNEL);
1205         if (ntlmssp_blob == NULL) {
1206                 rc = -ENOMEM;
1207                 goto out;
1208         }
1209
1210         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1211         if (use_spnego) {
1212                 /* BB eventually need to add this */
1213                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1214                 rc = -EOPNOTSUPP;
1215                 goto out;
1216         } else {
1217                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1218                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1219         }
1220         sess_data->iov[1].iov_base = ntlmssp_blob;
1221         sess_data->iov[1].iov_len = blob_length;
1222
1223         rc = SMB2_sess_sendreceive(sess_data);
1224         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1225
1226         /* If true, rc here is expected and not an error */
1227         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1228                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1229                 rc = 0;
1230
1231         if (rc)
1232                 goto out;
1233
1234         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1235                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1236                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1237                         le16_to_cpu(rsp->SecurityBufferOffset));
1238                 rc = -EIO;
1239                 goto out;
1240         }
1241         rc = decode_ntlmssp_challenge(rsp->Buffer,
1242                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1243         if (rc)
1244                 goto out;
1245
1246         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1247
1248
1249         ses->Suid = rsp->sync_hdr.SessionId;
1250         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1251
1252 out:
1253         kfree(ntlmssp_blob);
1254         SMB2_sess_free_buffer(sess_data);
1255         if (!rc) {
1256                 sess_data->result = 0;
1257                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1258                 return;
1259         }
1260 out_err:
1261         kfree(ses->ntlmssp);
1262         ses->ntlmssp = NULL;
1263         sess_data->result = rc;
1264         sess_data->func = NULL;
1265 }
1266
1267 static void
1268 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1269 {
1270         int rc;
1271         struct cifs_ses *ses = sess_data->ses;
1272         struct smb2_sess_setup_req *req;
1273         struct smb2_sess_setup_rsp *rsp = NULL;
1274         unsigned char *ntlmssp_blob = NULL;
1275         bool use_spnego = false; /* else use raw ntlmssp */
1276         u16 blob_length = 0;
1277
1278         rc = SMB2_sess_alloc_buffer(sess_data);
1279         if (rc)
1280                 goto out;
1281
1282         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1283         req->sync_hdr.SessionId = ses->Suid;
1284
1285         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1286                                         sess_data->nls_cp);
1287         if (rc) {
1288                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1289                 goto out;
1290         }
1291
1292         if (use_spnego) {
1293                 /* BB eventually need to add this */
1294                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1295                 rc = -EOPNOTSUPP;
1296                 goto out;
1297         }
1298         sess_data->iov[1].iov_base = ntlmssp_blob;
1299         sess_data->iov[1].iov_len = blob_length;
1300
1301         rc = SMB2_sess_sendreceive(sess_data);
1302         if (rc)
1303                 goto out;
1304
1305         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1306
1307         ses->Suid = rsp->sync_hdr.SessionId;
1308         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1309
1310         rc = SMB2_sess_establish_session(sess_data);
1311 out:
1312         kfree(ntlmssp_blob);
1313         SMB2_sess_free_buffer(sess_data);
1314         kfree(ses->ntlmssp);
1315         ses->ntlmssp = NULL;
1316         sess_data->result = rc;
1317         sess_data->func = NULL;
1318 }
1319
1320 static int
1321 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1322 {
1323         int type;
1324
1325         type = smb2_select_sectype(ses->server, ses->sectype);
1326         cifs_dbg(FYI, "sess setup type %d\n", type);
1327         if (type == Unspecified) {
1328                 cifs_dbg(VFS,
1329                         "Unable to select appropriate authentication method!");
1330                 return -EINVAL;
1331         }
1332
1333         switch (type) {
1334         case Kerberos:
1335                 sess_data->func = SMB2_auth_kerberos;
1336                 break;
1337         case RawNTLMSSP:
1338                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1339                 break;
1340         default:
1341                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1342                 return -EOPNOTSUPP;
1343         }
1344
1345         return 0;
1346 }
1347
1348 int
1349 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1350                 const struct nls_table *nls_cp)
1351 {
1352         int rc = 0;
1353         struct TCP_Server_Info *server = ses->server;
1354         struct SMB2_sess_data *sess_data;
1355
1356         cifs_dbg(FYI, "Session Setup\n");
1357
1358         if (!server) {
1359                 WARN(1, "%s: server is NULL!\n", __func__);
1360                 return -EIO;
1361         }
1362
1363         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1364         if (!sess_data)
1365                 return -ENOMEM;
1366
1367         rc = SMB2_select_sec(ses, sess_data);
1368         if (rc)
1369                 goto out;
1370         sess_data->xid = xid;
1371         sess_data->ses = ses;
1372         sess_data->buf0_type = CIFS_NO_BUFFER;
1373         sess_data->nls_cp = (struct nls_table *) nls_cp;
1374         sess_data->previous_session = ses->Suid;
1375
1376 #ifdef CONFIG_CIFS_SMB311
1377         /*
1378          * Initialize the session hash with the server one.
1379          */
1380         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1381                SMB2_PREAUTH_HASH_SIZE);
1382 #endif
1383
1384         while (sess_data->func)
1385                 sess_data->func(sess_data);
1386
1387         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1388                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1389         rc = sess_data->result;
1390 out:
1391         kfree(sess_data);
1392         return rc;
1393 }
1394
1395 int
1396 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1397 {
1398         struct smb_rqst rqst;
1399         struct smb2_logoff_req *req; /* response is also trivial struct */
1400         int rc = 0;
1401         struct TCP_Server_Info *server;
1402         int flags = 0;
1403         unsigned int total_len;
1404         struct kvec iov[1];
1405         struct kvec rsp_iov;
1406         int resp_buf_type;
1407
1408         cifs_dbg(FYI, "disconnect session %p\n", ses);
1409
1410         if (ses && (ses->server))
1411                 server = ses->server;
1412         else
1413                 return -EIO;
1414
1415         /* no need to send SMB logoff if uid already closed due to reconnect */
1416         if (ses->need_reconnect)
1417                 goto smb2_session_already_dead;
1418
1419         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1420         if (rc)
1421                 return rc;
1422
1423          /* since no tcon, smb2_init can not do this, so do here */
1424         req->sync_hdr.SessionId = ses->Suid;
1425
1426         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1427                 flags |= CIFS_TRANSFORM_REQ;
1428         else if (server->sign)
1429                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1430
1431         flags |= CIFS_NO_RESP;
1432
1433         iov[0].iov_base = (char *)req;
1434         iov[0].iov_len = total_len;
1435
1436         memset(&rqst, 0, sizeof(struct smb_rqst));
1437         rqst.rq_iov = iov;
1438         rqst.rq_nvec = 1;
1439
1440         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1441         cifs_small_buf_release(req);
1442         /*
1443          * No tcon so can't do
1444          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1445          */
1446
1447 smb2_session_already_dead:
1448         return rc;
1449 }
1450
1451 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1452 {
1453         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1454 }
1455
1456 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1457
1458 /* These are similar values to what Windows uses */
1459 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1460 {
1461         tcon->max_chunks = 256;
1462         tcon->max_bytes_chunk = 1048576;
1463         tcon->max_bytes_copy = 16777216;
1464 }
1465
1466 int
1467 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1468           struct cifs_tcon *tcon, const struct nls_table *cp)
1469 {
1470         struct smb_rqst rqst;
1471         struct smb2_tree_connect_req *req;
1472         struct smb2_tree_connect_rsp *rsp = NULL;
1473         struct kvec iov[2];
1474         struct kvec rsp_iov = { NULL, 0 };
1475         int rc = 0;
1476         int resp_buftype;
1477         int unc_path_len;
1478         __le16 *unc_path = NULL;
1479         int flags = 0;
1480         unsigned int total_len;
1481
1482         cifs_dbg(FYI, "TCON\n");
1483
1484         if (!(ses->server) || !tree)
1485                 return -EIO;
1486
1487         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1488         if (unc_path == NULL)
1489                 return -ENOMEM;
1490
1491         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1492         unc_path_len *= 2;
1493         if (unc_path_len < 2) {
1494                 kfree(unc_path);
1495                 return -EINVAL;
1496         }
1497
1498         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1499         tcon->tid = 0;
1500
1501         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1502                              &total_len);
1503         if (rc) {
1504                 kfree(unc_path);
1505                 return rc;
1506         }
1507
1508         if (smb3_encryption_required(tcon))
1509                 flags |= CIFS_TRANSFORM_REQ;
1510
1511         iov[0].iov_base = (char *)req;
1512         /* 1 for pad */
1513         iov[0].iov_len = total_len - 1;
1514
1515         /* Testing shows that buffer offset must be at location of Buffer[0] */
1516         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1517                         - 1 /* pad */);
1518         req->PathLength = cpu_to_le16(unc_path_len - 2);
1519         iov[1].iov_base = unc_path;
1520         iov[1].iov_len = unc_path_len;
1521
1522         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1523         if ((ses->server->dialect == SMB311_PROT_ID) &&
1524             !smb3_encryption_required(tcon))
1525                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1526
1527         memset(&rqst, 0, sizeof(struct smb_rqst));
1528         rqst.rq_iov = iov;
1529         rqst.rq_nvec = 2;
1530
1531         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1532         cifs_small_buf_release(req);
1533         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1534
1535         if (rc != 0) {
1536                 if (tcon) {
1537                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1538                         tcon->need_reconnect = true;
1539                 }
1540                 goto tcon_error_exit;
1541         }
1542
1543         switch (rsp->ShareType) {
1544         case SMB2_SHARE_TYPE_DISK:
1545                 cifs_dbg(FYI, "connection to disk share\n");
1546                 break;
1547         case SMB2_SHARE_TYPE_PIPE:
1548                 tcon->pipe = true;
1549                 cifs_dbg(FYI, "connection to pipe share\n");
1550                 break;
1551         case SMB2_SHARE_TYPE_PRINT:
1552                 tcon->print = true;
1553                 cifs_dbg(FYI, "connection to printer\n");
1554                 break;
1555         default:
1556                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1557                 rc = -EOPNOTSUPP;
1558                 goto tcon_error_exit;
1559         }
1560
1561         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1562         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1563         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1564         tcon->tidStatus = CifsGood;
1565         tcon->need_reconnect = false;
1566         tcon->tid = rsp->sync_hdr.TreeId;
1567         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1568
1569         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1570             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1571                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1572
1573         if (tcon->seal &&
1574             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1575                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1576
1577         init_copy_chunk_defaults(tcon);
1578         if (tcon->ses->server->ops->validate_negotiate)
1579                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1580 tcon_exit:
1581         free_rsp_buf(resp_buftype, rsp);
1582         kfree(unc_path);
1583         return rc;
1584
1585 tcon_error_exit:
1586         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1587                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1588         }
1589         goto tcon_exit;
1590 }
1591
1592 int
1593 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1594 {
1595         struct smb_rqst rqst;
1596         struct smb2_tree_disconnect_req *req; /* response is trivial */
1597         int rc = 0;
1598         struct cifs_ses *ses = tcon->ses;
1599         int flags = 0;
1600         unsigned int total_len;
1601         struct kvec iov[1];
1602         struct kvec rsp_iov;
1603         int resp_buf_type;
1604
1605         cifs_dbg(FYI, "Tree Disconnect\n");
1606
1607         if (!ses || !(ses->server))
1608                 return -EIO;
1609
1610         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1611                 return 0;
1612
1613         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1614                              &total_len);
1615         if (rc)
1616                 return rc;
1617
1618         if (smb3_encryption_required(tcon))
1619                 flags |= CIFS_TRANSFORM_REQ;
1620
1621         flags |= CIFS_NO_RESP;
1622
1623         iov[0].iov_base = (char *)req;
1624         iov[0].iov_len = total_len;
1625
1626         memset(&rqst, 0, sizeof(struct smb_rqst));
1627         rqst.rq_iov = iov;
1628         rqst.rq_nvec = 1;
1629
1630         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1631         cifs_small_buf_release(req);
1632         if (rc)
1633                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1634
1635         return rc;
1636 }
1637
1638
1639 static struct create_durable *
1640 create_durable_buf(void)
1641 {
1642         struct create_durable *buf;
1643
1644         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1645         if (!buf)
1646                 return NULL;
1647
1648         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1649                                         (struct create_durable, Data));
1650         buf->ccontext.DataLength = cpu_to_le32(16);
1651         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1652                                 (struct create_durable, Name));
1653         buf->ccontext.NameLength = cpu_to_le16(4);
1654         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1655         buf->Name[0] = 'D';
1656         buf->Name[1] = 'H';
1657         buf->Name[2] = 'n';
1658         buf->Name[3] = 'Q';
1659         return buf;
1660 }
1661
1662 static struct create_durable *
1663 create_reconnect_durable_buf(struct cifs_fid *fid)
1664 {
1665         struct create_durable *buf;
1666
1667         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1668         if (!buf)
1669                 return NULL;
1670
1671         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1672                                         (struct create_durable, Data));
1673         buf->ccontext.DataLength = cpu_to_le32(16);
1674         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1675                                 (struct create_durable, Name));
1676         buf->ccontext.NameLength = cpu_to_le16(4);
1677         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1678         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1679         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1680         buf->Name[0] = 'D';
1681         buf->Name[1] = 'H';
1682         buf->Name[2] = 'n';
1683         buf->Name[3] = 'C';
1684         return buf;
1685 }
1686
1687 static __u8
1688 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1689                   unsigned int *epoch, char *lease_key)
1690 {
1691         char *data_offset;
1692         struct create_context *cc;
1693         unsigned int next;
1694         unsigned int remaining;
1695         char *name;
1696
1697         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1698         remaining = le32_to_cpu(rsp->CreateContextsLength);
1699         cc = (struct create_context *)data_offset;
1700         while (remaining >= sizeof(struct create_context)) {
1701                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1702                 if (le16_to_cpu(cc->NameLength) == 4 &&
1703                     strncmp(name, "RqLs", 4) == 0)
1704                         return server->ops->parse_lease_buf(cc, epoch,
1705                                                             lease_key);
1706
1707                 next = le32_to_cpu(cc->Next);
1708                 if (!next)
1709                         break;
1710                 remaining -= next;
1711                 cc = (struct create_context *)((char *)cc + next);
1712         }
1713
1714         return 0;
1715 }
1716
1717 static int
1718 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1719                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1720 {
1721         struct smb2_create_req *req = iov[0].iov_base;
1722         unsigned int num = *num_iovec;
1723
1724         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1725         if (iov[num].iov_base == NULL)
1726                 return -ENOMEM;
1727         iov[num].iov_len = server->vals->create_lease_size;
1728         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1729         if (!req->CreateContextsOffset)
1730                 req->CreateContextsOffset = cpu_to_le32(
1731                                 sizeof(struct smb2_create_req) +
1732                                 iov[num - 1].iov_len);
1733         le32_add_cpu(&req->CreateContextsLength,
1734                      server->vals->create_lease_size);
1735         *num_iovec = num + 1;
1736         return 0;
1737 }
1738
1739 static struct create_durable_v2 *
1740 create_durable_v2_buf(struct cifs_fid *pfid)
1741 {
1742         struct create_durable_v2 *buf;
1743
1744         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1745         if (!buf)
1746                 return NULL;
1747
1748         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1749                                         (struct create_durable_v2, dcontext));
1750         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1751         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1752                                 (struct create_durable_v2, Name));
1753         buf->ccontext.NameLength = cpu_to_le16(4);
1754
1755         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1756         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1757         generate_random_uuid(buf->dcontext.CreateGuid);
1758         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1759
1760         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1761         buf->Name[0] = 'D';
1762         buf->Name[1] = 'H';
1763         buf->Name[2] = '2';
1764         buf->Name[3] = 'Q';
1765         return buf;
1766 }
1767
1768 static struct create_durable_handle_reconnect_v2 *
1769 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1770 {
1771         struct create_durable_handle_reconnect_v2 *buf;
1772
1773         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1774                         GFP_KERNEL);
1775         if (!buf)
1776                 return NULL;
1777
1778         buf->ccontext.DataOffset =
1779                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1780                                      dcontext));
1781         buf->ccontext.DataLength =
1782                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1783         buf->ccontext.NameOffset =
1784                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1785                             Name));
1786         buf->ccontext.NameLength = cpu_to_le16(4);
1787
1788         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1789         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1790         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1791         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1792
1793         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1794         buf->Name[0] = 'D';
1795         buf->Name[1] = 'H';
1796         buf->Name[2] = '2';
1797         buf->Name[3] = 'C';
1798         return buf;
1799 }
1800
1801 static int
1802 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1803                     struct cifs_open_parms *oparms)
1804 {
1805         struct smb2_create_req *req = iov[0].iov_base;
1806         unsigned int num = *num_iovec;
1807
1808         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1809         if (iov[num].iov_base == NULL)
1810                 return -ENOMEM;
1811         iov[num].iov_len = sizeof(struct create_durable_v2);
1812         if (!req->CreateContextsOffset)
1813                 req->CreateContextsOffset =
1814                         cpu_to_le32(sizeof(struct smb2_create_req) +
1815                                                                 iov[1].iov_len);
1816         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1817         *num_iovec = num + 1;
1818         return 0;
1819 }
1820
1821 static int
1822 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1823                     struct cifs_open_parms *oparms)
1824 {
1825         struct smb2_create_req *req = iov[0].iov_base;
1826         unsigned int num = *num_iovec;
1827
1828         /* indicate that we don't need to relock the file */
1829         oparms->reconnect = false;
1830
1831         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1832         if (iov[num].iov_base == NULL)
1833                 return -ENOMEM;
1834         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1835         if (!req->CreateContextsOffset)
1836                 req->CreateContextsOffset =
1837                         cpu_to_le32(sizeof(struct smb2_create_req) +
1838                                                                 iov[1].iov_len);
1839         le32_add_cpu(&req->CreateContextsLength,
1840                         sizeof(struct create_durable_handle_reconnect_v2));
1841         *num_iovec = num + 1;
1842         return 0;
1843 }
1844
1845 static int
1846 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1847                     struct cifs_open_parms *oparms, bool use_persistent)
1848 {
1849         struct smb2_create_req *req = iov[0].iov_base;
1850         unsigned int num = *num_iovec;
1851
1852         if (use_persistent) {
1853                 if (oparms->reconnect)
1854                         return add_durable_reconnect_v2_context(iov, num_iovec,
1855                                                                 oparms);
1856                 else
1857                         return add_durable_v2_context(iov, num_iovec, oparms);
1858         }
1859
1860         if (oparms->reconnect) {
1861                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1862                 /* indicate that we don't need to relock the file */
1863                 oparms->reconnect = false;
1864         } else
1865                 iov[num].iov_base = create_durable_buf();
1866         if (iov[num].iov_base == NULL)
1867                 return -ENOMEM;
1868         iov[num].iov_len = sizeof(struct create_durable);
1869         if (!req->CreateContextsOffset)
1870                 req->CreateContextsOffset =
1871                         cpu_to_le32(sizeof(struct smb2_create_req) +
1872                                                                 iov[1].iov_len);
1873         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1874         *num_iovec = num + 1;
1875         return 0;
1876 }
1877
1878 static int
1879 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1880                             const char *treename, const __le16 *path)
1881 {
1882         int treename_len, path_len;
1883         struct nls_table *cp;
1884         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1885
1886         /*
1887          * skip leading "\\"
1888          */
1889         treename_len = strlen(treename);
1890         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1891                 return -EINVAL;
1892
1893         treename += 2;
1894         treename_len -= 2;
1895
1896         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1897
1898         /*
1899          * make room for one path separator between the treename and
1900          * path
1901          */
1902         *out_len = treename_len + 1 + path_len;
1903
1904         /*
1905          * final path needs to be null-terminated UTF16 with a
1906          * size aligned to 8
1907          */
1908
1909         *out_size = roundup((*out_len+1)*2, 8);
1910         *out_path = kzalloc(*out_size, GFP_KERNEL);
1911         if (!*out_path)
1912                 return -ENOMEM;
1913
1914         cp = load_nls_default();
1915         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1916         UniStrcat(*out_path, sep);
1917         UniStrcat(*out_path, path);
1918         unload_nls(cp);
1919
1920         return 0;
1921 }
1922
1923 #ifdef CONFIG_CIFS_SMB311
1924 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1925                                umode_t mode, struct cifs_tcon *tcon,
1926                                const char *full_path,
1927                                struct cifs_sb_info *cifs_sb)
1928 {
1929         struct smb_rqst rqst;
1930         struct smb2_create_req *req;
1931         struct smb2_create_rsp *rsp;
1932         struct TCP_Server_Info *server;
1933         struct cifs_ses *ses = tcon->ses;
1934         struct kvec iov[3]; /* make sure at least one for each open context */
1935         struct kvec rsp_iov = {NULL, 0};
1936         int resp_buftype;
1937         int uni_path_len;
1938         __le16 *copy_path = NULL;
1939         int copy_size;
1940         int rc = 0;
1941         unsigned int n_iov = 2;
1942         __u32 file_attributes = 0;
1943         char *pc_buf = NULL;
1944         int flags = 0;
1945         unsigned int total_len;
1946         __le16 *path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1947
1948         if (!path)
1949                 return -ENOMEM;
1950
1951         cifs_dbg(FYI, "mkdir\n");
1952
1953         if (ses && (ses->server))
1954                 server = ses->server;
1955         else
1956                 return -EIO;
1957
1958         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1959
1960         if (rc)
1961                 return rc;
1962
1963         if (smb3_encryption_required(tcon))
1964                 flags |= CIFS_TRANSFORM_REQ;
1965
1966
1967         req->ImpersonationLevel = IL_IMPERSONATION;
1968         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1969         /* File attributes ignored on open (used in create though) */
1970         req->FileAttributes = cpu_to_le32(file_attributes);
1971         req->ShareAccess = FILE_SHARE_ALL_LE;
1972         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
1973         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
1974
1975         iov[0].iov_base = (char *)req;
1976         /* -1 since last byte is buf[0] which is sent below (path) */
1977         iov[0].iov_len = total_len - 1;
1978
1979         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1980
1981         /* [MS-SMB2] 2.2.13 NameOffset:
1982          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1983          * the SMB2 header, the file name includes a prefix that will
1984          * be processed during DFS name normalization as specified in
1985          * section 3.3.5.9. Otherwise, the file name is relative to
1986          * the share that is identified by the TreeId in the SMB2
1987          * header.
1988          */
1989         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1990                 int name_len;
1991
1992                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1993                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1994                                                  &name_len,
1995                                                  tcon->treeName, path);
1996                 if (rc) {
1997                         cifs_small_buf_release(req);
1998                         return rc;
1999                 }
2000                 req->NameLength = cpu_to_le16(name_len * 2);
2001                 uni_path_len = copy_size;
2002                 path = copy_path;
2003         } else {
2004                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2005                 /* MUST set path len (NameLength) to 0 opening root of share */
2006                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2007                 if (uni_path_len % 8 != 0) {
2008                         copy_size = roundup(uni_path_len, 8);
2009                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2010                         if (!copy_path) {
2011                                 cifs_small_buf_release(req);
2012                                 return -ENOMEM;
2013                         }
2014                         memcpy((char *)copy_path, (const char *)path,
2015                                uni_path_len);
2016                         uni_path_len = copy_size;
2017                         path = copy_path;
2018                 }
2019         }
2020
2021         iov[1].iov_len = uni_path_len;
2022         iov[1].iov_base = path;
2023         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2024
2025         if (tcon->posix_extensions) {
2026                 if (n_iov > 2) {
2027                         struct create_context *ccontext =
2028                             (struct create_context *)iov[n_iov-1].iov_base;
2029                         ccontext->Next =
2030                                 cpu_to_le32(iov[n_iov-1].iov_len);
2031                 }
2032
2033                 rc = add_posix_context(iov, &n_iov, mode);
2034                 if (rc) {
2035                         cifs_small_buf_release(req);
2036                         kfree(copy_path);
2037                         return rc;
2038                 }
2039                 pc_buf = iov[n_iov-1].iov_base;
2040         }
2041
2042
2043         memset(&rqst, 0, sizeof(struct smb_rqst));
2044         rqst.rq_iov = iov;
2045         rqst.rq_nvec = n_iov;
2046
2047         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2048                             &rsp_iov);
2049
2050         cifs_small_buf_release(req);
2051         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2052
2053         if (rc != 0) {
2054                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2055                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2056                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES, rc);
2057                 goto smb311_mkdir_exit;
2058         } else
2059                 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2060                                      ses->Suid, CREATE_NOT_FILE,
2061                                      FILE_WRITE_ATTRIBUTES);
2062
2063         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2064
2065         /* Eventually save off posix specific response info and timestaps */
2066
2067 smb311_mkdir_exit:
2068         kfree(copy_path);
2069         kfree(pc_buf);
2070         free_rsp_buf(resp_buftype, rsp);
2071         return rc;
2072
2073 }
2074 #endif /* SMB311 */
2075
2076 int
2077 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2078           __u8 *oplock, struct smb2_file_all_info *buf,
2079           struct kvec *err_iov, int *buftype)
2080 {
2081         struct smb_rqst rqst;
2082         struct smb2_create_req *req;
2083         struct smb2_create_rsp *rsp;
2084         struct TCP_Server_Info *server;
2085         struct cifs_tcon *tcon = oparms->tcon;
2086         struct cifs_ses *ses = tcon->ses;
2087         struct kvec iov[5]; /* make sure at least one for each open context */
2088         struct kvec rsp_iov = {NULL, 0};
2089         int resp_buftype;
2090         int uni_path_len;
2091         __le16 *copy_path = NULL;
2092         int copy_size;
2093         int rc = 0;
2094         unsigned int n_iov = 2;
2095         __u32 file_attributes = 0;
2096         char *dhc_buf = NULL, *lc_buf = NULL, *pc_buf = NULL;
2097         int flags = 0;
2098         unsigned int total_len;
2099
2100         cifs_dbg(FYI, "create/open\n");
2101
2102         if (ses && (ses->server))
2103                 server = ses->server;
2104         else
2105                 return -EIO;
2106
2107         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2108
2109         if (rc)
2110                 return rc;
2111
2112         if (smb3_encryption_required(tcon))
2113                 flags |= CIFS_TRANSFORM_REQ;
2114
2115         if (oparms->create_options & CREATE_OPTION_READONLY)
2116                 file_attributes |= ATTR_READONLY;
2117         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2118                 file_attributes |= ATTR_SYSTEM;
2119
2120         req->ImpersonationLevel = IL_IMPERSONATION;
2121         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2122         /* File attributes ignored on open (used in create though) */
2123         req->FileAttributes = cpu_to_le32(file_attributes);
2124         req->ShareAccess = FILE_SHARE_ALL_LE;
2125         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2126         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2127
2128         iov[0].iov_base = (char *)req;
2129         /* -1 since last byte is buf[0] which is sent below (path) */
2130         iov[0].iov_len = total_len - 1;
2131
2132         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2133
2134         /* [MS-SMB2] 2.2.13 NameOffset:
2135          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2136          * the SMB2 header, the file name includes a prefix that will
2137          * be processed during DFS name normalization as specified in
2138          * section 3.3.5.9. Otherwise, the file name is relative to
2139          * the share that is identified by the TreeId in the SMB2
2140          * header.
2141          */
2142         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2143                 int name_len;
2144
2145                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2146                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2147                                                  &name_len,
2148                                                  tcon->treeName, path);
2149                 if (rc) {
2150                         cifs_small_buf_release(req);
2151                         return rc;
2152                 }
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                 if (uni_path_len % 8 != 0) {
2161                         copy_size = roundup(uni_path_len, 8);
2162                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2163                         if (!copy_path) {
2164                                 cifs_small_buf_release(req);
2165                                 return -ENOMEM;
2166                         }
2167                         memcpy((char *)copy_path, (const char *)path,
2168                                uni_path_len);
2169                         uni_path_len = copy_size;
2170                         path = copy_path;
2171                 }
2172         }
2173
2174         iov[1].iov_len = uni_path_len;
2175         iov[1].iov_base = path;
2176
2177         if (!server->oplocks)
2178                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2179
2180         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2181             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2182                 req->RequestedOplockLevel = *oplock;
2183         else {
2184                 rc = add_lease_context(server, iov, &n_iov,
2185                                        oparms->fid->lease_key, oplock);
2186                 if (rc) {
2187                         cifs_small_buf_release(req);
2188                         kfree(copy_path);
2189                         return rc;
2190                 }
2191                 lc_buf = iov[n_iov-1].iov_base;
2192         }
2193
2194         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2195                 /* need to set Next field of lease context if we request it */
2196                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2197                         struct create_context *ccontext =
2198                             (struct create_context *)iov[n_iov-1].iov_base;
2199                         ccontext->Next =
2200                                 cpu_to_le32(server->vals->create_lease_size);
2201                 }
2202
2203                 rc = add_durable_context(iov, &n_iov, oparms,
2204                                         tcon->use_persistent);
2205                 if (rc) {
2206                         cifs_small_buf_release(req);
2207                         kfree(copy_path);
2208                         kfree(lc_buf);
2209                         return rc;
2210                 }
2211                 dhc_buf = iov[n_iov-1].iov_base;
2212         }
2213
2214 #ifdef CONFIG_CIFS_SMB311
2215         if (tcon->posix_extensions) {
2216                 if (n_iov > 2) {
2217                         struct create_context *ccontext =
2218                             (struct create_context *)iov[n_iov-1].iov_base;
2219                         ccontext->Next =
2220                                 cpu_to_le32(iov[n_iov-1].iov_len);
2221                 }
2222
2223                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2224                 if (rc) {
2225                         cifs_small_buf_release(req);
2226                         kfree(copy_path);
2227                         kfree(lc_buf);
2228                         kfree(dhc_buf);
2229                         return rc;
2230                 }
2231                 pc_buf = iov[n_iov-1].iov_base;
2232         }
2233 #endif /* SMB311 */
2234
2235         memset(&rqst, 0, sizeof(struct smb_rqst));
2236         rqst.rq_iov = iov;
2237         rqst.rq_nvec = n_iov;
2238
2239         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2240                             &rsp_iov);
2241         cifs_small_buf_release(req);
2242         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2243
2244         if (rc != 0) {
2245                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2246                 if (err_iov && rsp) {
2247                         *err_iov = rsp_iov;
2248                         *buftype = resp_buftype;
2249                         resp_buftype = CIFS_NO_BUFFER;
2250                         rsp = NULL;
2251                 }
2252                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2253                                     oparms->create_options, oparms->desired_access, rc);
2254                 goto creat_exit;
2255         } else
2256                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2257                                      ses->Suid, oparms->create_options,
2258                                      oparms->desired_access);
2259
2260         oparms->fid->persistent_fid = rsp->PersistentFileId;
2261         oparms->fid->volatile_fid = rsp->VolatileFileId;
2262
2263         if (buf) {
2264                 memcpy(buf, &rsp->CreationTime, 32);
2265                 buf->AllocationSize = rsp->AllocationSize;
2266                 buf->EndOfFile = rsp->EndofFile;
2267                 buf->Attributes = rsp->FileAttributes;
2268                 buf->NumberOfLinks = cpu_to_le32(1);
2269                 buf->DeletePending = 0;
2270         }
2271
2272         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2273                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2274                                             oparms->fid->lease_key);
2275         else
2276                 *oplock = rsp->OplockLevel;
2277 creat_exit:
2278         kfree(copy_path);
2279         kfree(lc_buf);
2280         kfree(dhc_buf);
2281         kfree(pc_buf);
2282         free_rsp_buf(resp_buftype, rsp);
2283         return rc;
2284 }
2285
2286 /*
2287  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2288  */
2289 int
2290 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2291            u64 volatile_fid, u32 opcode, bool is_fsctl,
2292            char *in_data, u32 indatalen,
2293            char **out_data, u32 *plen /* returned data len */)
2294 {
2295         struct smb_rqst rqst;
2296         struct smb2_ioctl_req *req;
2297         struct smb2_ioctl_rsp *rsp;
2298         struct cifs_ses *ses;
2299         struct kvec iov[2];
2300         struct kvec rsp_iov;
2301         int resp_buftype;
2302         int n_iov;
2303         int rc = 0;
2304         int flags = 0;
2305         unsigned int total_len;
2306
2307         cifs_dbg(FYI, "SMB2 IOCTL\n");
2308
2309         if (out_data != NULL)
2310                 *out_data = NULL;
2311
2312         /* zero out returned data len, in case of error */
2313         if (plen)
2314                 *plen = 0;
2315
2316         if (tcon)
2317                 ses = tcon->ses;
2318         else
2319                 return -EIO;
2320
2321         if (!ses || !(ses->server))
2322                 return -EIO;
2323
2324         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2325         if (rc)
2326                 return rc;
2327
2328         if (smb3_encryption_required(tcon))
2329                 flags |= CIFS_TRANSFORM_REQ;
2330
2331         req->CtlCode = cpu_to_le32(opcode);
2332         req->PersistentFileId = persistent_fid;
2333         req->VolatileFileId = volatile_fid;
2334
2335         if (indatalen) {
2336                 req->InputCount = cpu_to_le32(indatalen);
2337                 /* do not set InputOffset if no input data */
2338                 req->InputOffset =
2339                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2340                 iov[1].iov_base = in_data;
2341                 iov[1].iov_len = indatalen;
2342                 n_iov = 2;
2343         } else
2344                 n_iov = 1;
2345
2346         req->OutputOffset = 0;
2347         req->OutputCount = 0; /* MBZ */
2348
2349         /*
2350          * Could increase MaxOutputResponse, but that would require more
2351          * than one credit. Windows typically sets this smaller, but for some
2352          * ioctls it may be useful to allow server to send more. No point
2353          * limiting what the server can send as long as fits in one credit
2354          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2355          * (by default, note that it can be overridden to make max larger)
2356          * in responses (except for read responses which can be bigger.
2357          * We may want to bump this limit up
2358          */
2359         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2360
2361         if (is_fsctl)
2362                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2363         else
2364                 req->Flags = 0;
2365
2366         iov[0].iov_base = (char *)req;
2367
2368         /*
2369          * If no input data, the size of ioctl struct in
2370          * protocol spec still includes a 1 byte data buffer,
2371          * but if input data passed to ioctl, we do not
2372          * want to double count this, so we do not send
2373          * the dummy one byte of data in iovec[0] if sending
2374          * input data (in iovec[1]).
2375          */
2376
2377         if (indatalen) {
2378                 iov[0].iov_len = total_len - 1;
2379         } else
2380                 iov[0].iov_len = total_len;
2381
2382         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2383         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2384                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2385
2386         memset(&rqst, 0, sizeof(struct smb_rqst));
2387         rqst.rq_iov = iov;
2388         rqst.rq_nvec = n_iov;
2389
2390         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2391                             &rsp_iov);
2392         cifs_small_buf_release(req);
2393         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2394
2395         if (rc != 0)
2396                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2397                                 ses->Suid, 0, opcode, rc);
2398
2399         if ((rc != 0) && (rc != -EINVAL)) {
2400                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2401                 goto ioctl_exit;
2402         } else if (rc == -EINVAL) {
2403                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2404                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2405                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2406                         goto ioctl_exit;
2407                 }
2408         }
2409
2410         /* check if caller wants to look at return data or just return rc */
2411         if ((plen == NULL) || (out_data == NULL))
2412                 goto ioctl_exit;
2413
2414         *plen = le32_to_cpu(rsp->OutputCount);
2415
2416         /* We check for obvious errors in the output buffer length and offset */
2417         if (*plen == 0)
2418                 goto ioctl_exit; /* server returned no data */
2419         else if (*plen > 0xFF00) {
2420                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2421                 *plen = 0;
2422                 rc = -EIO;
2423                 goto ioctl_exit;
2424         }
2425
2426         if (rsp_iov.iov_len < le32_to_cpu(rsp->OutputOffset) + *plen) {
2427                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2428                         le32_to_cpu(rsp->OutputOffset));
2429                 *plen = 0;
2430                 rc = -EIO;
2431                 goto ioctl_exit;
2432         }
2433
2434         *out_data = kmalloc(*plen, GFP_KERNEL);
2435         if (*out_data == NULL) {
2436                 rc = -ENOMEM;
2437                 goto ioctl_exit;
2438         }
2439
2440         memcpy(*out_data, (char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen);
2441 ioctl_exit:
2442         free_rsp_buf(resp_buftype, rsp);
2443         return rc;
2444 }
2445
2446 /*
2447  *   Individual callers to ioctl worker function follow
2448  */
2449
2450 int
2451 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2452                      u64 persistent_fid, u64 volatile_fid)
2453 {
2454         int rc;
2455         struct  compress_ioctl fsctl_input;
2456         char *ret_data = NULL;
2457
2458         fsctl_input.CompressionState =
2459                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2460
2461         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2462                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2463                         (char *)&fsctl_input /* data input */,
2464                         2 /* in data len */, &ret_data /* out data */, NULL);
2465
2466         cifs_dbg(FYI, "set compression rc %d\n", rc);
2467
2468         return rc;
2469 }
2470
2471 int
2472 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2473                  u64 persistent_fid, u64 volatile_fid, int flags)
2474 {
2475         struct smb_rqst rqst;
2476         struct smb2_close_req *req;
2477         struct smb2_close_rsp *rsp;
2478         struct cifs_ses *ses = tcon->ses;
2479         struct kvec iov[1];
2480         struct kvec rsp_iov;
2481         int resp_buftype;
2482         int rc = 0;
2483         unsigned int total_len;
2484
2485         cifs_dbg(FYI, "Close\n");
2486
2487         if (!ses || !(ses->server))
2488                 return -EIO;
2489
2490         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2491         if (rc)
2492                 return rc;
2493
2494         if (smb3_encryption_required(tcon))
2495                 flags |= CIFS_TRANSFORM_REQ;
2496
2497         req->PersistentFileId = persistent_fid;
2498         req->VolatileFileId = volatile_fid;
2499
2500         iov[0].iov_base = (char *)req;
2501         iov[0].iov_len = total_len;
2502
2503         memset(&rqst, 0, sizeof(struct smb_rqst));
2504         rqst.rq_iov = iov;
2505         rqst.rq_nvec = 1;
2506
2507         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2508         cifs_small_buf_release(req);
2509         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2510
2511         if (rc != 0) {
2512                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2513                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2514                                      rc);
2515                 goto close_exit;
2516         }
2517
2518         /* BB FIXME - decode close response, update inode for caching */
2519
2520 close_exit:
2521         free_rsp_buf(resp_buftype, rsp);
2522         return rc;
2523 }
2524
2525 int
2526 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2527            u64 persistent_fid, u64 volatile_fid)
2528 {
2529         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2530 }
2531
2532 static int
2533 validate_iov(unsigned int offset, unsigned int buffer_length,
2534              struct kvec *iov, unsigned int min_buf_size)
2535 {
2536         unsigned int smb_len = iov->iov_len;
2537         char *end_of_smb = smb_len + (char *)iov->iov_base;
2538         char *begin_of_buf = offset + (char *)iov->iov_base;
2539         char *end_of_buf = begin_of_buf + buffer_length;
2540
2541
2542         if (buffer_length < min_buf_size) {
2543                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2544                          buffer_length, min_buf_size);
2545                 return -EINVAL;
2546         }
2547
2548         /* check if beyond RFC1001 maximum length */
2549         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2550                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2551                          buffer_length, smb_len);
2552                 return -EINVAL;
2553         }
2554
2555         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2556                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2557                 return -EINVAL;
2558         }
2559
2560         return 0;
2561 }
2562
2563 /*
2564  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2565  * Caller must free buffer.
2566  */
2567 static int
2568 validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2569                       struct kvec *iov, unsigned int minbufsize,
2570                       char *data)
2571 {
2572         char *begin_of_buf = offset + (char *)iov->iov_base;
2573         int rc;
2574
2575         if (!data)
2576                 return -EINVAL;
2577
2578         rc = validate_iov(offset, buffer_length, iov, minbufsize);
2579         if (rc)
2580                 return rc;
2581
2582         memcpy(data, begin_of_buf, buffer_length);
2583
2584         return 0;
2585 }
2586
2587 static int
2588 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2589            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2590            u32 additional_info, size_t output_len, size_t min_len, void **data,
2591                 u32 *dlen)
2592 {
2593         struct smb_rqst rqst;
2594         struct smb2_query_info_req *req;
2595         struct smb2_query_info_rsp *rsp = NULL;
2596         struct kvec iov[2];
2597         struct kvec rsp_iov;
2598         int rc = 0;
2599         int resp_buftype;
2600         struct cifs_ses *ses = tcon->ses;
2601         int flags = 0;
2602         unsigned int total_len;
2603
2604         cifs_dbg(FYI, "Query Info\n");
2605
2606         if (!ses || !(ses->server))
2607                 return -EIO;
2608
2609         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2610                              &total_len);
2611         if (rc)
2612                 return rc;
2613
2614         if (smb3_encryption_required(tcon))
2615                 flags |= CIFS_TRANSFORM_REQ;
2616
2617         req->InfoType = info_type;
2618         req->FileInfoClass = info_class;
2619         req->PersistentFileId = persistent_fid;
2620         req->VolatileFileId = volatile_fid;
2621         req->AdditionalInformation = cpu_to_le32(additional_info);
2622
2623         /*
2624          * We do not use the input buffer (do not send extra byte)
2625          */
2626         req->InputBufferOffset = 0;
2627
2628         req->OutputBufferLength = cpu_to_le32(output_len);
2629
2630         iov[0].iov_base = (char *)req;
2631         /* 1 for Buffer */
2632         iov[0].iov_len = total_len - 1;
2633
2634         memset(&rqst, 0, sizeof(struct smb_rqst));
2635         rqst.rq_iov = iov;
2636         rqst.rq_nvec = 1;
2637
2638         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2639         cifs_small_buf_release(req);
2640         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2641
2642         if (rc) {
2643                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2644                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2645                                 ses->Suid, info_class, (__u32)info_type, rc);
2646                 goto qinf_exit;
2647         }
2648
2649         if (dlen) {
2650                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2651                 if (!*data) {
2652                         *data = kmalloc(*dlen, GFP_KERNEL);
2653                         if (!*data) {
2654                                 cifs_dbg(VFS,
2655                                         "Error %d allocating memory for acl\n",
2656                                         rc);
2657                                 *dlen = 0;
2658                                 goto qinf_exit;
2659                         }
2660                 }
2661         }
2662
2663         rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2664                                    le32_to_cpu(rsp->OutputBufferLength),
2665                                    &rsp_iov, min_len, *data);
2666
2667 qinf_exit:
2668         free_rsp_buf(resp_buftype, rsp);
2669         return rc;
2670 }
2671
2672 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2673                    u64 persistent_fid, u64 volatile_fid,
2674                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2675 {
2676         return query_info(xid, tcon, persistent_fid, volatile_fid,
2677                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2678                           ea_buf_size,
2679                           sizeof(struct smb2_file_full_ea_info),
2680                           (void **)&data,
2681                           NULL);
2682 }
2683
2684 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2685         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2686 {
2687         return query_info(xid, tcon, persistent_fid, volatile_fid,
2688                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2689                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2690                           sizeof(struct smb2_file_all_info), (void **)&data,
2691                           NULL);
2692 }
2693
2694 int
2695 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2696                 u64 persistent_fid, u64 volatile_fid,
2697                 void **data, u32 *plen)
2698 {
2699         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2700         *plen = 0;
2701
2702         return query_info(xid, tcon, persistent_fid, volatile_fid,
2703                           0, SMB2_O_INFO_SECURITY, additional_info,
2704                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2705 }
2706
2707 int
2708 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2709                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2710 {
2711         return query_info(xid, tcon, persistent_fid, volatile_fid,
2712                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2713                           sizeof(struct smb2_file_internal_info),
2714                           sizeof(struct smb2_file_internal_info),
2715                           (void **)&uniqueid, NULL);
2716 }
2717
2718 /*
2719  * This is a no-op for now. We're not really interested in the reply, but
2720  * rather in the fact that the server sent one and that server->lstrp
2721  * gets updated.
2722  *
2723  * FIXME: maybe we should consider checking that the reply matches request?
2724  */
2725 static void
2726 smb2_echo_callback(struct mid_q_entry *mid)
2727 {
2728         struct TCP_Server_Info *server = mid->callback_data;
2729         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2730         unsigned int credits_received = 1;
2731
2732         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2733                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2734
2735         DeleteMidQEntry(mid);
2736         add_credits(server, credits_received, CIFS_ECHO_OP);
2737 }
2738
2739 void smb2_reconnect_server(struct work_struct *work)
2740 {
2741         struct TCP_Server_Info *server = container_of(work,
2742                                         struct TCP_Server_Info, reconnect.work);
2743         struct cifs_ses *ses;
2744         struct cifs_tcon *tcon, *tcon2;
2745         struct list_head tmp_list;
2746         int tcon_exist = false;
2747         int rc;
2748         int resched = false;
2749
2750
2751         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2752         mutex_lock(&server->reconnect_mutex);
2753
2754         INIT_LIST_HEAD(&tmp_list);
2755         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2756
2757         spin_lock(&cifs_tcp_ses_lock);
2758         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2759                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2760                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2761                                 tcon->tc_count++;
2762                                 list_add_tail(&tcon->rlist, &tmp_list);
2763                                 tcon_exist = true;
2764                         }
2765                 }
2766                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2767                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2768                         tcon_exist = true;
2769                 }
2770         }
2771         /*
2772          * Get the reference to server struct to be sure that the last call of
2773          * cifs_put_tcon() in the loop below won't release the server pointer.
2774          */
2775         if (tcon_exist)
2776                 server->srv_count++;
2777
2778         spin_unlock(&cifs_tcp_ses_lock);
2779
2780         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2781                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2782                 if (!rc)
2783                         cifs_reopen_persistent_handles(tcon);
2784                 else
2785                         resched = true;
2786                 list_del_init(&tcon->rlist);
2787                 cifs_put_tcon(tcon);
2788         }
2789
2790         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2791         if (resched)
2792                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2793         mutex_unlock(&server->reconnect_mutex);
2794
2795         /* now we can safely release srv struct */
2796         if (tcon_exist)
2797                 cifs_put_tcp_session(server, 1);
2798 }
2799
2800 int
2801 SMB2_echo(struct TCP_Server_Info *server)
2802 {
2803         struct smb2_echo_req *req;
2804         int rc = 0;
2805         struct kvec iov[1];
2806         struct smb_rqst rqst = { .rq_iov = iov,
2807                                  .rq_nvec = 1 };
2808         unsigned int total_len;
2809
2810         cifs_dbg(FYI, "In echo request\n");
2811
2812         if (server->tcpStatus == CifsNeedNegotiate) {
2813                 /* No need to send echo on newly established connections */
2814                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2815                 return rc;
2816         }
2817
2818         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2819         if (rc)
2820                 return rc;
2821
2822         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2823
2824         iov[0].iov_len = total_len;
2825         iov[0].iov_base = (char *)req;
2826
2827         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2828                              server, CIFS_ECHO_OP);
2829         if (rc)
2830                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2831
2832         cifs_small_buf_release(req);
2833         return rc;
2834 }
2835
2836 int
2837 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2838            u64 volatile_fid)
2839 {
2840         struct smb_rqst rqst;
2841         struct smb2_flush_req *req;
2842         struct cifs_ses *ses = tcon->ses;
2843         struct kvec iov[1];
2844         struct kvec rsp_iov;
2845         int resp_buftype;
2846         int rc = 0;
2847         int flags = 0;
2848         unsigned int total_len;
2849
2850         cifs_dbg(FYI, "Flush\n");
2851
2852         if (!ses || !(ses->server))
2853                 return -EIO;
2854
2855         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2856         if (rc)
2857                 return rc;
2858
2859         if (smb3_encryption_required(tcon))
2860                 flags |= CIFS_TRANSFORM_REQ;
2861
2862         req->PersistentFileId = persistent_fid;
2863         req->VolatileFileId = volatile_fid;
2864
2865         iov[0].iov_base = (char *)req;
2866         iov[0].iov_len = total_len;
2867
2868         memset(&rqst, 0, sizeof(struct smb_rqst));
2869         rqst.rq_iov = iov;
2870         rqst.rq_nvec = 1;
2871
2872         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2873         cifs_small_buf_release(req);
2874
2875         if (rc != 0) {
2876                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2877                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2878                                      rc);
2879         }
2880
2881         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2882         return rc;
2883 }
2884
2885 /*
2886  * To form a chain of read requests, any read requests after the first should
2887  * have the end_of_chain boolean set to true.
2888  */
2889 static int
2890 smb2_new_read_req(void **buf, unsigned int *total_len,
2891         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2892         unsigned int remaining_bytes, int request_type)
2893 {
2894         int rc = -EACCES;
2895         struct smb2_read_plain_req *req = NULL;
2896         struct smb2_sync_hdr *shdr;
2897         struct TCP_Server_Info *server;
2898
2899         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2900                                  total_len);
2901         if (rc)
2902                 return rc;
2903
2904         server = io_parms->tcon->ses->server;
2905         if (server == NULL)
2906                 return -ECONNABORTED;
2907
2908         shdr = &req->sync_hdr;
2909         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2910
2911         req->PersistentFileId = io_parms->persistent_fid;
2912         req->VolatileFileId = io_parms->volatile_fid;
2913         req->ReadChannelInfoOffset = 0; /* reserved */
2914         req->ReadChannelInfoLength = 0; /* reserved */
2915         req->Channel = 0; /* reserved */
2916         req->MinimumCount = 0;
2917         req->Length = cpu_to_le32(io_parms->length);
2918         req->Offset = cpu_to_le64(io_parms->offset);
2919 #ifdef CONFIG_CIFS_SMB_DIRECT
2920         /*
2921          * If we want to do a RDMA write, fill in and append
2922          * smbd_buffer_descriptor_v1 to the end of read request
2923          */
2924         if (server->rdma && rdata && !server->sign &&
2925                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2926
2927                 struct smbd_buffer_descriptor_v1 *v1;
2928                 bool need_invalidate =
2929                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2930
2931                 rdata->mr = smbd_register_mr(
2932                                 server->smbd_conn, rdata->pages,
2933                                 rdata->nr_pages, rdata->page_offset,
2934                                 rdata->tailsz, true, need_invalidate);
2935                 if (!rdata->mr)
2936                         return -ENOBUFS;
2937
2938                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2939                 if (need_invalidate)
2940                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2941                 req->ReadChannelInfoOffset =
2942                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2943                 req->ReadChannelInfoLength =
2944                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2945                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2946                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2947                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2948                 v1->length = cpu_to_le32(rdata->mr->mr->length);
2949
2950                 *total_len += sizeof(*v1) - 1;
2951         }
2952 #endif
2953         if (request_type & CHAINED_REQUEST) {
2954                 if (!(request_type & END_OF_CHAIN)) {
2955                         /* next 8-byte aligned request */
2956                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2957                         shdr->NextCommand = cpu_to_le32(*total_len);
2958                 } else /* END_OF_CHAIN */
2959                         shdr->NextCommand = 0;
2960                 if (request_type & RELATED_REQUEST) {
2961                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2962                         /*
2963                          * Related requests use info from previous read request
2964                          * in chain.
2965                          */
2966                         shdr->SessionId = 0xFFFFFFFF;
2967                         shdr->TreeId = 0xFFFFFFFF;
2968                         req->PersistentFileId = 0xFFFFFFFF;
2969                         req->VolatileFileId = 0xFFFFFFFF;
2970                 }
2971         }
2972         if (remaining_bytes > io_parms->length)
2973                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2974         else
2975                 req->RemainingBytes = 0;
2976
2977         *buf = req;
2978         return rc;
2979 }
2980
2981 static void
2982 smb2_readv_callback(struct mid_q_entry *mid)
2983 {
2984         struct cifs_readdata *rdata = mid->callback_data;
2985         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2986         struct TCP_Server_Info *server = tcon->ses->server;
2987         struct smb2_sync_hdr *shdr =
2988                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
2989         unsigned int credits_received = 1;
2990         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2991                                  .rq_nvec = 2,
2992                                  .rq_pages = rdata->pages,
2993                                  .rq_offset = rdata->page_offset,
2994                                  .rq_npages = rdata->nr_pages,
2995                                  .rq_pagesz = rdata->pagesz,
2996                                  .rq_tailsz = rdata->tailsz };
2997
2998         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2999                  __func__, mid->mid, mid->mid_state, rdata->result,
3000                  rdata->bytes);
3001
3002         switch (mid->mid_state) {
3003         case MID_RESPONSE_RECEIVED:
3004                 credits_received = le16_to_cpu(shdr->CreditRequest);
3005                 /* result already set, check signature */
3006                 if (server->sign && !mid->decrypted) {
3007                         int rc;
3008
3009                         rc = smb2_verify_signature(&rqst, server);
3010                         if (rc)
3011                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3012                                          rc);
3013                 }
3014                 /* FIXME: should this be counted toward the initiating task? */
3015                 task_io_account_read(rdata->got_bytes);
3016                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3017                 break;
3018         case MID_REQUEST_SUBMITTED:
3019         case MID_RETRY_NEEDED:
3020                 rdata->result = -EAGAIN;
3021                 if (server->sign && rdata->got_bytes)
3022                         /* reset bytes number since we can not check a sign */
3023                         rdata->got_bytes = 0;
3024                 /* FIXME: should this be counted toward the initiating task? */
3025                 task_io_account_read(rdata->got_bytes);
3026                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3027                 break;
3028         default:
3029                 if (rdata->result != -ENODATA)
3030                         rdata->result = -EIO;
3031         }
3032 #ifdef CONFIG_CIFS_SMB_DIRECT
3033         /*
3034          * If this rdata has a memmory registered, the MR can be freed
3035          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3036          * because they have limited number and are used for future I/Os
3037          */
3038         if (rdata->mr) {
3039                 smbd_deregister_mr(rdata->mr);
3040                 rdata->mr = NULL;
3041         }
3042 #endif
3043         if (rdata->result)
3044                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3045
3046         queue_work(cifsiod_wq, &rdata->work);
3047         DeleteMidQEntry(mid);
3048         add_credits(server, credits_received, 0);
3049 }
3050
3051 /* smb2_async_readv - send an async read, and set up mid to handle result */
3052 int
3053 smb2_async_readv(struct cifs_readdata *rdata)
3054 {
3055         int rc, flags = 0;
3056         char *buf;
3057         struct smb2_sync_hdr *shdr;
3058         struct cifs_io_parms io_parms;
3059         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3060                                  .rq_nvec = 1 };
3061         struct TCP_Server_Info *server;
3062         unsigned int total_len;
3063
3064         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3065                  __func__, rdata->offset, rdata->bytes);
3066
3067         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3068         io_parms.offset = rdata->offset;
3069         io_parms.length = rdata->bytes;
3070         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3071         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3072         io_parms.pid = rdata->pid;
3073
3074         server = io_parms.tcon->ses->server;
3075
3076         rc = smb2_new_read_req(
3077                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3078         if (rc) {
3079                 if (rc == -EAGAIN && rdata->credits) {
3080                         /* credits was reset by reconnect */
3081                         rdata->credits = 0;
3082                         /* reduce in_flight value since we won't send the req */
3083                         spin_lock(&server->req_lock);
3084                         server->in_flight--;
3085                         spin_unlock(&server->req_lock);
3086                 }
3087                 return rc;
3088         }
3089
3090         if (smb3_encryption_required(io_parms.tcon))
3091                 flags |= CIFS_TRANSFORM_REQ;
3092
3093         rdata->iov[0].iov_base = buf;
3094         rdata->iov[0].iov_len = total_len;
3095
3096         shdr = (struct smb2_sync_hdr *)buf;
3097
3098         if (rdata->credits) {
3099                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3100                                                 SMB2_MAX_BUFFER_SIZE));
3101                 shdr->CreditRequest = shdr->CreditCharge;
3102                 spin_lock(&server->req_lock);
3103                 server->credits += rdata->credits -
3104                                                 le16_to_cpu(shdr->CreditCharge);
3105                 spin_unlock(&server->req_lock);
3106                 wake_up(&server->request_q);
3107                 flags |= CIFS_HAS_CREDITS;
3108         }
3109
3110         kref_get(&rdata->refcount);
3111         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3112                              cifs_readv_receive, smb2_readv_callback,
3113                              smb3_handle_read_data, rdata, flags);
3114         if (rc) {
3115                 kref_put(&rdata->refcount, cifs_readdata_release);
3116                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3117                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3118                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3119                                    io_parms.offset, io_parms.length);
3120         } else
3121                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3122                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3123                                    io_parms.offset, io_parms.length);
3124
3125         cifs_small_buf_release(buf);
3126         return rc;
3127 }
3128
3129 int
3130 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3131           unsigned int *nbytes, char **buf, int *buf_type)
3132 {
3133         struct smb_rqst rqst;
3134         int resp_buftype, rc = -EACCES;
3135         struct smb2_read_plain_req *req = NULL;
3136         struct smb2_read_rsp *rsp = NULL;
3137         struct kvec iov[1];
3138         struct kvec rsp_iov;
3139         unsigned int total_len;
3140         int flags = CIFS_LOG_ERROR;
3141         struct cifs_ses *ses = io_parms->tcon->ses;
3142
3143         *nbytes = 0;
3144         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3145         if (rc)
3146                 return rc;
3147
3148         if (smb3_encryption_required(io_parms->tcon))
3149                 flags |= CIFS_TRANSFORM_REQ;
3150
3151         iov[0].iov_base = (char *)req;
3152         iov[0].iov_len = total_len;
3153
3154         memset(&rqst, 0, sizeof(struct smb_rqst));
3155         rqst.rq_iov = iov;
3156         rqst.rq_nvec = 1;
3157
3158         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3159         cifs_small_buf_release(req);
3160
3161         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3162
3163         if (rc) {
3164                 if (rc != -ENODATA) {
3165                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3166                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3167                 }
3168                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3169                                     io_parms->tcon->tid, ses->Suid,
3170                                     io_parms->offset, io_parms->length);
3171                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3172                 return rc == -ENODATA ? 0 : rc;
3173         } else
3174                 trace_smb3_read_done(xid, req->PersistentFileId,
3175                                     io_parms->tcon->tid, ses->Suid,
3176                                     io_parms->offset, io_parms->length);
3177
3178         *nbytes = le32_to_cpu(rsp->DataLength);
3179         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3180             (*nbytes > io_parms->length)) {
3181                 cifs_dbg(FYI, "bad length %d for count %d\n",
3182                          *nbytes, io_parms->length);
3183                 rc = -EIO;
3184                 *nbytes = 0;
3185         }
3186
3187         if (*buf) {
3188                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3189                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3190         } else if (resp_buftype != CIFS_NO_BUFFER) {
3191                 *buf = rsp_iov.iov_base;
3192                 if (resp_buftype == CIFS_SMALL_BUFFER)
3193                         *buf_type = CIFS_SMALL_BUFFER;
3194                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3195                         *buf_type = CIFS_LARGE_BUFFER;
3196         }
3197         return rc;
3198 }
3199
3200 /*
3201  * Check the mid_state and signature on received buffer (if any), and queue the
3202  * workqueue completion task.
3203  */
3204 static void
3205 smb2_writev_callback(struct mid_q_entry *mid)
3206 {
3207         struct cifs_writedata *wdata = mid->callback_data;
3208         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3209         unsigned int written;
3210         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3211         unsigned int credits_received = 1;
3212
3213         switch (mid->mid_state) {
3214         case MID_RESPONSE_RECEIVED:
3215                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3216                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3217                 if (wdata->result != 0)
3218                         break;
3219
3220                 written = le32_to_cpu(rsp->DataLength);
3221                 /*
3222                  * Mask off high 16 bits when bytes written as returned
3223                  * by the server is greater than bytes requested by the
3224                  * client. OS/2 servers are known to set incorrect
3225                  * CountHigh values.
3226                  */
3227                 if (written > wdata->bytes)
3228                         written &= 0xFFFF;
3229
3230                 if (written < wdata->bytes)
3231                         wdata->result = -ENOSPC;
3232                 else
3233                         wdata->bytes = written;
3234                 break;
3235         case MID_REQUEST_SUBMITTED:
3236         case MID_RETRY_NEEDED:
3237                 wdata->result = -EAGAIN;
3238                 break;
3239         default:
3240                 wdata->result = -EIO;
3241                 break;
3242         }
3243 #ifdef CONFIG_CIFS_SMB_DIRECT
3244         /*
3245          * If this wdata has a memory registered, the MR can be freed
3246          * The number of MRs available is limited, it's important to recover
3247          * used MR as soon as I/O is finished. Hold MR longer in the later
3248          * I/O process can possibly result in I/O deadlock due to lack of MR
3249          * to send request on I/O retry
3250          */
3251         if (wdata->mr) {
3252                 smbd_deregister_mr(wdata->mr);
3253                 wdata->mr = NULL;
3254         }
3255 #endif
3256         if (wdata->result)
3257                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3258
3259         queue_work(cifsiod_wq, &wdata->work);
3260         DeleteMidQEntry(mid);
3261         add_credits(tcon->ses->server, credits_received, 0);
3262 }
3263
3264 /* smb2_async_writev - send an async write, and set up mid to handle result */
3265 int
3266 smb2_async_writev(struct cifs_writedata *wdata,
3267                   void (*release)(struct kref *kref))
3268 {
3269         int rc = -EACCES, flags = 0;
3270         struct smb2_write_req *req = NULL;
3271         struct smb2_sync_hdr *shdr;
3272         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3273         struct TCP_Server_Info *server = tcon->ses->server;
3274         struct kvec iov[1];
3275         struct smb_rqst rqst = { };
3276         unsigned int total_len;
3277
3278         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3279         if (rc) {
3280                 if (rc == -EAGAIN && wdata->credits) {
3281                         /* credits was reset by reconnect */
3282                         wdata->credits = 0;
3283                         /* reduce in_flight value since we won't send the req */
3284                         spin_lock(&server->req_lock);
3285                         server->in_flight--;
3286                         spin_unlock(&server->req_lock);
3287                 }
3288                 goto async_writev_out;
3289         }
3290
3291         if (smb3_encryption_required(tcon))
3292                 flags |= CIFS_TRANSFORM_REQ;
3293
3294         shdr = (struct smb2_sync_hdr *)req;
3295         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3296
3297         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3298         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3299         req->WriteChannelInfoOffset = 0;
3300         req->WriteChannelInfoLength = 0;
3301         req->Channel = 0;
3302         req->Offset = cpu_to_le64(wdata->offset);
3303         req->DataOffset = cpu_to_le16(
3304                                 offsetof(struct smb2_write_req, Buffer));
3305         req->RemainingBytes = 0;
3306 #ifdef CONFIG_CIFS_SMB_DIRECT
3307         /*
3308          * If we want to do a server RDMA read, fill in and append
3309          * smbd_buffer_descriptor_v1 to the end of write request
3310          */
3311         if (server->rdma && !server->sign && wdata->bytes >=
3312                 server->smbd_conn->rdma_readwrite_threshold) {
3313
3314                 struct smbd_buffer_descriptor_v1 *v1;
3315                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3316
3317                 wdata->mr = smbd_register_mr(
3318                                 server->smbd_conn, wdata->pages,
3319                                 wdata->nr_pages, wdata->page_offset,
3320                                 wdata->tailsz, false, need_invalidate);
3321                 if (!wdata->mr) {
3322                         rc = -ENOBUFS;
3323                         goto async_writev_out;
3324                 }
3325                 req->Length = 0;
3326                 req->DataOffset = 0;
3327                 if (wdata->nr_pages > 1)
3328                         req->RemainingBytes =
3329                                 cpu_to_le32(
3330                                         (wdata->nr_pages - 1) * wdata->pagesz -
3331                                         wdata->page_offset + wdata->tailsz
3332                                 );
3333                 else
3334                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3335                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3336                 if (need_invalidate)
3337                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3338                 req->WriteChannelInfoOffset =
3339                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3340                 req->WriteChannelInfoLength =
3341                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3342                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3343                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3344                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3345                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3346         }
3347 #endif
3348         iov[0].iov_len = total_len - 1;
3349         iov[0].iov_base = (char *)req;
3350
3351         rqst.rq_iov = iov;
3352         rqst.rq_nvec = 1;
3353         rqst.rq_pages = wdata->pages;
3354         rqst.rq_offset = wdata->page_offset;
3355         rqst.rq_npages = wdata->nr_pages;
3356         rqst.rq_pagesz = wdata->pagesz;
3357         rqst.rq_tailsz = wdata->tailsz;
3358 #ifdef CONFIG_CIFS_SMB_DIRECT
3359         if (wdata->mr) {
3360                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3361                 rqst.rq_npages = 0;
3362         }
3363 #endif
3364         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3365                  wdata->offset, wdata->bytes);
3366
3367 #ifdef CONFIG_CIFS_SMB_DIRECT
3368         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3369         if (!wdata->mr)
3370                 req->Length = cpu_to_le32(wdata->bytes);
3371 #else
3372         req->Length = cpu_to_le32(wdata->bytes);
3373 #endif
3374
3375         if (wdata->credits) {
3376                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3377                                                     SMB2_MAX_BUFFER_SIZE));
3378                 shdr->CreditRequest = shdr->CreditCharge;
3379                 spin_lock(&server->req_lock);
3380                 server->credits += wdata->credits -
3381                                                 le16_to_cpu(shdr->CreditCharge);
3382                 spin_unlock(&server->req_lock);
3383                 wake_up(&server->request_q);
3384                 flags |= CIFS_HAS_CREDITS;
3385         }
3386
3387         kref_get(&wdata->refcount);
3388         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3389                              wdata, flags);
3390
3391         if (rc) {
3392                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3393                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3394                                      wdata->bytes, rc);
3395                 kref_put(&wdata->refcount, release);
3396                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3397         } else
3398                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3399                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3400                                      wdata->bytes);
3401
3402 async_writev_out:
3403         cifs_small_buf_release(req);
3404         return rc;
3405 }
3406
3407 /*
3408  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3409  * The length field from io_parms must be at least 1 and indicates a number of
3410  * elements with data to write that begins with position 1 in iov array. All
3411  * data length is specified by count.
3412  */
3413 int
3414 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3415            unsigned int *nbytes, struct kvec *iov, int n_vec)
3416 {
3417         struct smb_rqst rqst;
3418         int rc = 0;
3419         struct smb2_write_req *req = NULL;
3420         struct smb2_write_rsp *rsp = NULL;
3421         int resp_buftype;
3422         struct kvec rsp_iov;
3423         int flags = 0;
3424         unsigned int total_len;
3425
3426         *nbytes = 0;
3427
3428         if (n_vec < 1)
3429                 return rc;
3430
3431         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3432                              &total_len);
3433         if (rc)
3434                 return rc;
3435
3436         if (io_parms->tcon->ses->server == NULL)
3437                 return -ECONNABORTED;
3438
3439         if (smb3_encryption_required(io_parms->tcon))
3440                 flags |= CIFS_TRANSFORM_REQ;
3441
3442         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3443
3444         req->PersistentFileId = io_parms->persistent_fid;
3445         req->VolatileFileId = io_parms->volatile_fid;
3446         req->WriteChannelInfoOffset = 0;
3447         req->WriteChannelInfoLength = 0;
3448         req->Channel = 0;
3449         req->Length = cpu_to_le32(io_parms->length);
3450         req->Offset = cpu_to_le64(io_parms->offset);
3451         req->DataOffset = cpu_to_le16(
3452                                 offsetof(struct smb2_write_req, Buffer));
3453         req->RemainingBytes = 0;
3454
3455         iov[0].iov_base = (char *)req;
3456         /* 1 for Buffer */
3457         iov[0].iov_len = total_len - 1;
3458
3459         memset(&rqst, 0, sizeof(struct smb_rqst));
3460         rqst.rq_iov = iov;
3461         rqst.rq_nvec = n_vec + 1;
3462
3463         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3464                             &resp_buftype, flags, &rsp_iov);
3465         cifs_small_buf_release(req);
3466         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3467
3468         if (rc) {
3469                 trace_smb3_write_err(xid, req->PersistentFileId,
3470                                      io_parms->tcon->tid,
3471                                      io_parms->tcon->ses->Suid,
3472                                      io_parms->offset, io_parms->length, rc);
3473                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3474                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3475         } else {
3476                 *nbytes = le32_to_cpu(rsp->DataLength);
3477                 trace_smb3_write_done(xid, req->PersistentFileId,
3478                                      io_parms->tcon->tid,
3479                                      io_parms->tcon->ses->Suid,
3480                                      io_parms->offset, *nbytes);
3481         }
3482
3483         free_rsp_buf(resp_buftype, rsp);
3484         return rc;
3485 }
3486
3487 static unsigned int
3488 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3489 {
3490         int len;
3491         unsigned int entrycount = 0;
3492         unsigned int next_offset = 0;
3493         FILE_DIRECTORY_INFO *entryptr;
3494
3495         if (bufstart == NULL)
3496                 return 0;
3497
3498         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3499
3500         while (1) {
3501                 entryptr = (FILE_DIRECTORY_INFO *)
3502                                         ((char *)entryptr + next_offset);
3503
3504                 if ((char *)entryptr + size > end_of_buf) {
3505                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3506                         break;
3507                 }
3508
3509                 len = le32_to_cpu(entryptr->FileNameLength);
3510                 if ((char *)entryptr + len + size > end_of_buf) {
3511                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3512                                  end_of_buf);
3513                         break;
3514                 }
3515
3516                 *lastentry = (char *)entryptr;
3517                 entrycount++;
3518
3519                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3520                 if (!next_offset)
3521                         break;
3522         }
3523
3524         return entrycount;
3525 }
3526
3527 /*
3528  * Readdir/FindFirst
3529  */
3530 int
3531 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3532                      u64 persistent_fid, u64 volatile_fid, int index,
3533                      struct cifs_search_info *srch_inf)
3534 {
3535         struct smb_rqst rqst;
3536         struct smb2_query_directory_req *req;
3537         struct smb2_query_directory_rsp *rsp = NULL;
3538         struct kvec iov[2];
3539         struct kvec rsp_iov;
3540         int rc = 0;
3541         int len;
3542         int resp_buftype = CIFS_NO_BUFFER;
3543         unsigned char *bufptr;
3544         struct TCP_Server_Info *server;
3545         struct cifs_ses *ses = tcon->ses;
3546         __le16 asteriks = cpu_to_le16('*');
3547         char *end_of_smb;
3548         unsigned int output_size = CIFSMaxBufSize;
3549         size_t info_buf_size;
3550         int flags = 0;
3551         unsigned int total_len;
3552
3553         if (ses && (ses->server))
3554                 server = ses->server;
3555         else
3556                 return -EIO;
3557
3558         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3559                              &total_len);
3560         if (rc)
3561                 return rc;
3562
3563         if (smb3_encryption_required(tcon))
3564                 flags |= CIFS_TRANSFORM_REQ;
3565
3566         switch (srch_inf->info_level) {
3567         case SMB_FIND_FILE_DIRECTORY_INFO:
3568                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3569                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3570                 break;
3571         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3572                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3573                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3574                 break;
3575         default:
3576                 cifs_dbg(VFS, "info level %u isn't supported\n",
3577                          srch_inf->info_level);
3578                 rc = -EINVAL;
3579                 goto qdir_exit;
3580         }
3581
3582         req->FileIndex = cpu_to_le32(index);
3583         req->PersistentFileId = persistent_fid;
3584         req->VolatileFileId = volatile_fid;
3585
3586         len = 0x2;
3587         bufptr = req->Buffer;
3588         memcpy(bufptr, &asteriks, len);
3589
3590         req->FileNameOffset =
3591                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3592         req->FileNameLength = cpu_to_le16(len);
3593         /*
3594          * BB could be 30 bytes or so longer if we used SMB2 specific
3595          * buffer lengths, but this is safe and close enough.
3596          */
3597         output_size = min_t(unsigned int, output_size, server->maxBuf);
3598         output_size = min_t(unsigned int, output_size, 2 << 15);
3599         req->OutputBufferLength = cpu_to_le32(output_size);
3600
3601         iov[0].iov_base = (char *)req;
3602         /* 1 for Buffer */
3603         iov[0].iov_len = total_len - 1;
3604
3605         iov[1].iov_base = (char *)(req->Buffer);
3606         iov[1].iov_len = len;
3607
3608         memset(&rqst, 0, sizeof(struct smb_rqst));
3609         rqst.rq_iov = iov;
3610         rqst.rq_nvec = 2;
3611
3612         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3613         cifs_small_buf_release(req);
3614         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3615
3616         if (rc) {
3617                 if (rc == -ENODATA &&
3618                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3619                         srch_inf->endOfSearch = true;
3620                         rc = 0;
3621                 }
3622                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3623                 goto qdir_exit;
3624         }
3625
3626         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3627                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3628                           info_buf_size);
3629         if (rc)
3630                 goto qdir_exit;
3631
3632         srch_inf->unicode = true;
3633
3634         if (srch_inf->ntwrk_buf_start) {
3635                 if (srch_inf->smallBuf)
3636                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3637                 else
3638                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3639         }
3640         srch_inf->ntwrk_buf_start = (char *)rsp;
3641         srch_inf->srch_entries_start = srch_inf->last_entry =
3642                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3643         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3644         srch_inf->entries_in_buffer =
3645                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3646                                     &srch_inf->last_entry, info_buf_size);
3647         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3648         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3649                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3650                  srch_inf->srch_entries_start, srch_inf->last_entry);
3651         if (resp_buftype == CIFS_LARGE_BUFFER)
3652                 srch_inf->smallBuf = false;
3653         else if (resp_buftype == CIFS_SMALL_BUFFER)
3654                 srch_inf->smallBuf = true;
3655         else
3656                 cifs_dbg(VFS, "illegal search buffer type\n");
3657
3658         return rc;
3659
3660 qdir_exit:
3661         free_rsp_buf(resp_buftype, rsp);
3662         return rc;
3663 }
3664
3665 static int
3666 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3667                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3668                u8 info_type, u32 additional_info, unsigned int num,
3669                 void **data, unsigned int *size)
3670 {
3671         struct smb_rqst rqst;
3672         struct smb2_set_info_req *req;
3673         struct smb2_set_info_rsp *rsp = NULL;
3674         struct kvec *iov;
3675         struct kvec rsp_iov;
3676         int rc = 0;
3677         int resp_buftype;
3678         unsigned int i;
3679         struct cifs_ses *ses = tcon->ses;
3680         int flags = 0;
3681         unsigned int total_len;
3682
3683         if (!ses || !(ses->server))
3684                 return -EIO;
3685
3686         if (!num)
3687                 return -EINVAL;
3688
3689         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3690         if (!iov)
3691                 return -ENOMEM;
3692
3693         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3694         if (rc) {
3695                 kfree(iov);
3696                 return rc;
3697         }
3698
3699         if (smb3_encryption_required(tcon))
3700                 flags |= CIFS_TRANSFORM_REQ;
3701
3702         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3703
3704         req->InfoType = info_type;
3705         req->FileInfoClass = info_class;
3706         req->PersistentFileId = persistent_fid;
3707         req->VolatileFileId = volatile_fid;
3708         req->AdditionalInformation = cpu_to_le32(additional_info);
3709
3710         req->BufferOffset =
3711                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3712         req->BufferLength = cpu_to_le32(*size);
3713
3714         memcpy(req->Buffer, *data, *size);
3715         total_len += *size;
3716
3717         iov[0].iov_base = (char *)req;
3718         /* 1 for Buffer */
3719         iov[0].iov_len = total_len - 1;
3720
3721         for (i = 1; i < num; i++) {
3722                 le32_add_cpu(&req->BufferLength, size[i]);
3723                 iov[i].iov_base = (char *)data[i];
3724                 iov[i].iov_len = size[i];
3725         }
3726
3727         memset(&rqst, 0, sizeof(struct smb_rqst));
3728         rqst.rq_iov = iov;
3729         rqst.rq_nvec = num;
3730
3731         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3732                             &rsp_iov);
3733         cifs_buf_release(req);
3734         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3735
3736         if (rc != 0) {
3737                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3738                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3739                                 ses->Suid, info_class, (__u32)info_type, rc);
3740         }
3741
3742         free_rsp_buf(resp_buftype, rsp);
3743         kfree(iov);
3744         return rc;
3745 }
3746
3747 int
3748 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3749             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3750 {
3751         struct smb2_file_rename_info info;
3752         void **data;
3753         unsigned int size[2];
3754         int rc;
3755         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3756
3757         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3758         if (!data)
3759                 return -ENOMEM;
3760
3761         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3762                               /* 0 = fail if target already exists */
3763         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3764         info.FileNameLength = cpu_to_le32(len);
3765
3766         data[0] = &info;
3767         size[0] = sizeof(struct smb2_file_rename_info);
3768
3769         data[1] = target_file;
3770         size[1] = len + 2 /* null */;
3771
3772         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3773                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3774                 0, 2, data, size);
3775         kfree(data);
3776         return rc;
3777 }
3778
3779 int
3780 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3781                   u64 persistent_fid, u64 volatile_fid)
3782 {
3783         __u8 delete_pending = 1;
3784         void *data;
3785         unsigned int size;
3786
3787         data = &delete_pending;
3788         size = 1; /* sizeof __u8 */
3789
3790         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3791                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3792                 0, 1, &data, &size);
3793 }
3794
3795 int
3796 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3797                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3798 {
3799         struct smb2_file_link_info info;
3800         void **data;
3801         unsigned int size[2];
3802         int rc;
3803         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3804
3805         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3806         if (!data)
3807                 return -ENOMEM;
3808
3809         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3810                               /* 0 = fail if link already exists */
3811         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3812         info.FileNameLength = cpu_to_le32(len);
3813
3814         data[0] = &info;
3815         size[0] = sizeof(struct smb2_file_link_info);
3816
3817         data[1] = target_file;
3818         size[1] = len + 2 /* null */;
3819
3820         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3821                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3822                         0, 2, data, size);
3823         kfree(data);
3824         return rc;
3825 }
3826
3827 int
3828 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3829              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3830 {
3831         struct smb2_file_eof_info info;
3832         void *data;
3833         unsigned int size;
3834
3835         info.EndOfFile = *eof;
3836
3837         data = &info;
3838         size = sizeof(struct smb2_file_eof_info);
3839
3840         if (is_falloc)
3841                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3842                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3843                         0, 1, &data, &size);
3844         else
3845                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3846                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3847                         0, 1, &data, &size);
3848 }
3849
3850 int
3851 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3852               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3853 {
3854         unsigned int size;
3855         size = sizeof(FILE_BASIC_INFO);
3856         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3857                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3858                 0, 1, (void **)&buf, &size);
3859 }
3860
3861 int
3862 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3863                 u64 persistent_fid, u64 volatile_fid,
3864                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3865 {
3866         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3867                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3868                         1, (void **)&pnntsd, &pacllen);
3869 }
3870
3871 int
3872 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3873             u64 persistent_fid, u64 volatile_fid,
3874             struct smb2_file_full_ea_info *buf, int len)
3875 {
3876         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3877                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3878                 0, 1, (void **)&buf, &len);
3879 }
3880
3881 int
3882 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3883                   const u64 persistent_fid, const u64 volatile_fid,
3884                   __u8 oplock_level)
3885 {
3886         struct smb_rqst rqst;
3887         int rc;
3888         struct smb2_oplock_break *req = NULL;
3889         struct cifs_ses *ses = tcon->ses;
3890         int flags = CIFS_OBREAK_OP;
3891         unsigned int total_len;
3892         struct kvec iov[1];
3893         struct kvec rsp_iov;
3894         int resp_buf_type;
3895
3896         cifs_dbg(FYI, "SMB2_oplock_break\n");
3897         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3898                              &total_len);
3899         if (rc)
3900                 return rc;
3901
3902         if (smb3_encryption_required(tcon))
3903                 flags |= CIFS_TRANSFORM_REQ;
3904
3905         req->VolatileFid = volatile_fid;
3906         req->PersistentFid = persistent_fid;
3907         req->OplockLevel = oplock_level;
3908         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3909
3910         flags |= CIFS_NO_RESP;
3911
3912         iov[0].iov_base = (char *)req;
3913         iov[0].iov_len = total_len;
3914
3915         memset(&rqst, 0, sizeof(struct smb_rqst));
3916         rqst.rq_iov = iov;
3917         rqst.rq_nvec = 1;
3918
3919         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3920         cifs_small_buf_release(req);
3921
3922         if (rc) {
3923                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3924                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3925         }
3926
3927         return rc;
3928 }
3929
3930 static void
3931 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3932                         struct kstatfs *kst)
3933 {
3934         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3935                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3936         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3937         kst->f_bfree  = kst->f_bavail =
3938                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3939         return;
3940 }
3941
3942 static int
3943 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3944                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3945 {
3946         struct TCP_Server_Info *server;
3947         int rc;
3948         struct smb2_query_info_req *req;
3949         unsigned int total_len;
3950
3951         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3952
3953         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3954                 return -EIO;
3955
3956         server = tcon->ses->server;
3957
3958         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3959                              &total_len);
3960         if (rc)
3961                 return rc;
3962
3963         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3964         req->FileInfoClass = level;
3965         req->PersistentFileId = persistent_fid;
3966         req->VolatileFileId = volatile_fid;
3967         /* 1 for pad */
3968         req->InputBufferOffset =
3969                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3970         req->OutputBufferLength = cpu_to_le32(
3971                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
3972
3973         iov->iov_base = (char *)req;
3974         iov->iov_len = total_len;
3975         return 0;
3976 }
3977
3978 int
3979 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3980               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3981 {
3982         struct smb_rqst rqst;
3983         struct smb2_query_info_rsp *rsp = NULL;
3984         struct kvec iov;
3985         struct kvec rsp_iov;
3986         int rc = 0;
3987         int resp_buftype;
3988         struct cifs_ses *ses = tcon->ses;
3989         struct smb2_fs_full_size_info *info = NULL;
3990         int flags = 0;
3991
3992         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3993                                 sizeof(struct smb2_fs_full_size_info),
3994                                 persistent_fid, volatile_fid);
3995         if (rc)
3996                 return rc;
3997
3998         if (smb3_encryption_required(tcon))
3999                 flags |= CIFS_TRANSFORM_REQ;
4000
4001         memset(&rqst, 0, sizeof(struct smb_rqst));
4002         rqst.rq_iov = &iov;
4003         rqst.rq_nvec = 1;
4004
4005         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4006         cifs_small_buf_release(iov.iov_base);
4007         if (rc) {
4008                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4009                 goto qfsinf_exit;
4010         }
4011         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4012
4013         info = (struct smb2_fs_full_size_info *)(
4014                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4015         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4016                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4017                           sizeof(struct smb2_fs_full_size_info));
4018         if (!rc)
4019                 copy_fs_info_to_kstatfs(info, fsdata);
4020
4021 qfsinf_exit:
4022         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4023         return rc;
4024 }
4025
4026 int
4027 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4028               u64 persistent_fid, u64 volatile_fid, int level)
4029 {
4030         struct smb_rqst rqst;
4031         struct smb2_query_info_rsp *rsp = NULL;
4032         struct kvec iov;
4033         struct kvec rsp_iov;
4034         int rc = 0;
4035         int resp_buftype, max_len, min_len;
4036         struct cifs_ses *ses = tcon->ses;
4037         unsigned int rsp_len, offset;
4038         int flags = 0;
4039
4040         if (level == FS_DEVICE_INFORMATION) {
4041                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4042                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4043         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4044                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4045                 min_len = MIN_FS_ATTR_INFO_SIZE;
4046         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4047                 max_len = sizeof(struct smb3_fs_ss_info);
4048                 min_len = sizeof(struct smb3_fs_ss_info);
4049         } else {
4050                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4051                 return -EINVAL;
4052         }
4053
4054         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4055                                 persistent_fid, volatile_fid);
4056         if (rc)
4057                 return rc;
4058
4059         if (smb3_encryption_required(tcon))
4060                 flags |= CIFS_TRANSFORM_REQ;
4061
4062         memset(&rqst, 0, sizeof(struct smb_rqst));
4063         rqst.rq_iov = &iov;
4064         rqst.rq_nvec = 1;
4065
4066         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4067         cifs_small_buf_release(iov.iov_base);
4068         if (rc) {
4069                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4070                 goto qfsattr_exit;
4071         }
4072         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4073
4074         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4075         offset = le16_to_cpu(rsp->OutputBufferOffset);
4076         rc = validate_iov(offset, rsp_len, &rsp_iov, min_len);
4077         if (rc)
4078                 goto qfsattr_exit;
4079
4080         if (level == FS_ATTRIBUTE_INFORMATION)
4081                 memcpy(&tcon->fsAttrInfo, offset
4082                         + (char *)rsp, min_t(unsigned int,
4083                         rsp_len, max_len));
4084         else if (level == FS_DEVICE_INFORMATION)
4085                 memcpy(&tcon->fsDevInfo, offset
4086                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4087         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4088                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4089                         (offset + (char *)rsp);
4090                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4091                 tcon->perf_sector_size =
4092                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4093         }
4094
4095 qfsattr_exit:
4096         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4097         return rc;
4098 }
4099
4100 int
4101 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4102            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4103            const __u32 num_lock, struct smb2_lock_element *buf)
4104 {
4105         struct smb_rqst rqst;
4106         int rc = 0;
4107         struct smb2_lock_req *req = NULL;
4108         struct kvec iov[2];
4109         struct kvec rsp_iov;
4110         int resp_buf_type;
4111         unsigned int count;
4112         int flags = CIFS_NO_RESP;
4113         unsigned int total_len;
4114
4115         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4116
4117         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4118         if (rc)
4119                 return rc;
4120
4121         if (smb3_encryption_required(tcon))
4122                 flags |= CIFS_TRANSFORM_REQ;
4123
4124         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4125         req->LockCount = cpu_to_le16(num_lock);
4126
4127         req->PersistentFileId = persist_fid;
4128         req->VolatileFileId = volatile_fid;
4129
4130         count = num_lock * sizeof(struct smb2_lock_element);
4131
4132         iov[0].iov_base = (char *)req;
4133         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4134         iov[1].iov_base = (char *)buf;
4135         iov[1].iov_len = count;
4136
4137         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4138
4139         memset(&rqst, 0, sizeof(struct smb_rqst));
4140         rqst.rq_iov = iov;
4141         rqst.rq_nvec = 2;
4142
4143         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4144                             &rsp_iov);
4145         cifs_small_buf_release(req);
4146         if (rc) {
4147                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4148                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4149                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4150                                     tcon->ses->Suid, rc);
4151         }
4152
4153         return rc;
4154 }
4155
4156 int
4157 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4158           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4159           const __u64 length, const __u64 offset, const __u32 lock_flags,
4160           const bool wait)
4161 {
4162         struct smb2_lock_element lock;
4163
4164         lock.Offset = cpu_to_le64(offset);
4165         lock.Length = cpu_to_le64(length);
4166         lock.Flags = cpu_to_le32(lock_flags);
4167         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4168                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4169
4170         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4171 }
4172
4173 int
4174 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4175                  __u8 *lease_key, const __le32 lease_state)
4176 {
4177         struct smb_rqst rqst;
4178         int rc;
4179         struct smb2_lease_ack *req = NULL;
4180         struct cifs_ses *ses = tcon->ses;
4181         int flags = CIFS_OBREAK_OP;
4182         unsigned int total_len;
4183         struct kvec iov[1];
4184         struct kvec rsp_iov;
4185         int resp_buf_type;
4186
4187         cifs_dbg(FYI, "SMB2_lease_break\n");
4188         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4189                              &total_len);
4190         if (rc)
4191                 return rc;
4192
4193         if (smb3_encryption_required(tcon))
4194                 flags |= CIFS_TRANSFORM_REQ;
4195
4196         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4197         req->StructureSize = cpu_to_le16(36);
4198         total_len += 12;
4199
4200         memcpy(req->LeaseKey, lease_key, 16);
4201         req->LeaseState = lease_state;
4202
4203         flags |= CIFS_NO_RESP;
4204
4205         iov[0].iov_base = (char *)req;
4206         iov[0].iov_len = total_len;
4207
4208         memset(&rqst, 0, sizeof(struct smb_rqst));
4209         rqst.rq_iov = iov;
4210         rqst.rq_nvec = 1;
4211
4212         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4213         cifs_small_buf_release(req);
4214
4215         if (rc) {
4216                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4217                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4218         }
4219
4220         return rc;
4221 }