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                 uint16_t com_code = le16_to_cpu(smb2_command);
 364                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 365                 cifs_stats_inc(&tcon->num_smbs_sent);
 366         }
 367
 368         return rc;
 369 }
 370
 371
 372 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 373 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 374
 375
 376 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 377 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 378 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 379
 380 static void
 381 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 382 {
 383         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 384         pneg_ctxt->DataLength = cpu_to_le16(38);
 385         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 386         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 387         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 388         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 389 }
 390
 391 static void
 392 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 393 {
 394         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 395         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 396         pneg_ctxt->CipherCount = cpu_to_le16(1);
 397 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 398         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 399 }
 400
 401 static void
 402 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 403 {
 404         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 405         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 406 }
 407
 408 static void
 409 assemble_neg_contexts(struct smb2_negotiate_req *req,
 410                       unsigned int *total_len)
 411 {
 412         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 413         unsigned int ctxt_len;
 414
 415         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 416         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 417         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 418         *total_len += ctxt_len;
 419         pneg_ctxt += ctxt_len;
 420
 421         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 422         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 423         *total_len += ctxt_len;
 424         pneg_ctxt += ctxt_len;
 425
 426         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 427         *total_len += sizeof(struct smb2_posix_neg_context);
 428
 429         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 430         req->NegotiateContextCount = cpu_to_le16(3);
 431 }
 432
 433 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 434 {
 435         unsigned int len = le16_to_cpu(ctxt->DataLength);
 436
 437         /* If invalid preauth context warn but use what we requested, SHA-512 */
 438         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 439                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 440                 return;
 441         }
 442         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 443                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 444         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 445                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 446 }
 447
 448 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 449                               struct smb2_encryption_neg_context *ctxt)
 450 {
 451         unsigned int len = le16_to_cpu(ctxt->DataLength);
 452
 453         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 454         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 455                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 456                 return -EINVAL;
 457         }
 458
 459         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 460                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 461                 return -EINVAL;
 462         }
 463         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 464         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 465             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 466                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 467                 return -EINVAL;
 468         }
 469         server->cipher_type = ctxt->Ciphers[0];
 470         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 471         return 0;
 472 }
 473
 474 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 475                                      struct TCP_Server_Info *server,
 476                                      unsigned int len_of_smb)
 477 {
 478         struct smb2_neg_context *pctx;
 479         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 480         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 481         unsigned int len_of_ctxts, i;
 482         int rc = 0;
 483
 484         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 485         if (len_of_smb <= offset) {
 486                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 487                 return -EINVAL;
 488         }
 489
 490         len_of_ctxts = len_of_smb - offset;
 491
 492         for (i = 0; i < ctxt_cnt; i++) {
 493                 int clen;
 494                 /* check that offset is not beyond end of SMB */
 495                 if (len_of_ctxts == 0)
 496                         break;
 497
 498                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 499                         break;
 500
 501                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 502                 clen = le16_to_cpu(pctx->DataLength);
 503                 if (clen > len_of_ctxts)
 504                         break;
 505
 506                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 507                         decode_preauth_context(
 508                                 (struct smb2_preauth_neg_context *)pctx);
 509                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 510                         rc = decode_encrypt_ctx(server,
 511                                 (struct smb2_encryption_neg_context *)pctx);
 512                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 513                         server->posix_ext_supported = true;
 514                 else
 515                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 516                                 le16_to_cpu(pctx->ContextType));
 517
 518                 if (rc)
 519                         break;
 520                 /* offsets must be 8 byte aligned */
 521                 clen = (clen + 7) & ~0x7;
 522                 offset += clen + sizeof(struct smb2_neg_context);
 523                 len_of_ctxts -= clen;
 524         }
 525         return rc;
 526 }
 527
 528 static struct create_posix *
 529 create_posix_buf(umode_t mode)
 530 {
 531         struct create_posix *buf;
 532
 533         buf = kzalloc(sizeof(struct create_posix),
 534                         GFP_KERNEL);
 535         if (!buf)
 536                 return NULL;
 537
 538         buf->ccontext.DataOffset =
 539                 cpu_to_le16(offsetof(struct create_posix, Mode));
 540         buf->ccontext.DataLength = cpu_to_le32(4);
 541         buf->ccontext.NameOffset =
 542                 cpu_to_le16(offsetof(struct create_posix, Name));
 543         buf->ccontext.NameLength = cpu_to_le16(16);
 544
 545         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 546         buf->Name[0] = 0x93;
 547         buf->Name[1] = 0xAD;
 548         buf->Name[2] = 0x25;
 549         buf->Name[3] = 0x50;
 550         buf->Name[4] = 0x9C;
 551         buf->Name[5] = 0xB4;
 552         buf->Name[6] = 0x11;
 553         buf->Name[7] = 0xE7;
 554         buf->Name[8] = 0xB4;
 555         buf->Name[9] = 0x23;
 556         buf->Name[10] = 0x83;
 557         buf->Name[11] = 0xDE;
 558         buf->Name[12] = 0x96;
 559         buf->Name[13] = 0x8B;
 560         buf->Name[14] = 0xCD;
 561         buf->Name[15] = 0x7C;
 562         buf->Mode = cpu_to_le32(mode);
 563         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 564         return buf;
 565 }
 566
 567 static int
 568 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 569 {
 570         struct smb2_create_req *req = iov[0].iov_base;
 571         unsigned int num = *num_iovec;
 572
 573         iov[num].iov_base = create_posix_buf(mode);
 574         if (iov[num].iov_base == NULL)
 575                 return -ENOMEM;
 576         iov[num].iov_len = sizeof(struct create_posix);
 577         if (!req->CreateContextsOffset)
 578                 req->CreateContextsOffset = cpu_to_le32(
 579                                 sizeof(struct smb2_create_req) +
 580                                 iov[num - 1].iov_len);
 581         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 582         *num_iovec = num + 1;
 583         return 0;
 584 }
 585
 586
 587 /*
 588  *
 589  *      SMB2 Worker functions follow:
 590  *
 591  *      The general structure of the worker functions is:
 592  *      1) Call smb2_init (assembles SMB2 header)
 593  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 594  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 595  *      4) Decode SMB2 command specific fields in the fixed length area
 596  *      5) Decode variable length data area (if any for this SMB2 command type)
 597  *      6) Call free smb buffer
 598  *      7) return
 599  *
 600  */
 601
 602 int
 603 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 604 {
 605         struct smb_rqst rqst;
 606         struct smb2_negotiate_req *req;
 607         struct smb2_negotiate_rsp *rsp;
 608         struct kvec iov[1];
 609         struct kvec rsp_iov;
 610         int rc = 0;
 611         int resp_buftype;
 612         struct TCP_Server_Info *server = ses->server;
 613         int blob_offset, blob_length;
 614         char *security_blob;
 615         int flags = CIFS_NEG_OP;
 616         unsigned int total_len;
 617
 618         cifs_dbg(FYI, "Negotiate protocol\n");
 619
 620         if (!server) {
 621                 WARN(1, "%s: server is NULL!\n", __func__);
 622                 return -EIO;
 623         }
 624
 625         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 626         if (rc)
 627                 return rc;
 628
 629         req->sync_hdr.SessionId = 0;
 630
 631         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 632         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 633
 634         if (strcmp(ses->server->vals->version_string,
 635                    SMB3ANY_VERSION_STRING) == 0) {
 636                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 637                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 638                 req->DialectCount = cpu_to_le16(2);
 639                 total_len += 4;
 640         } else if (strcmp(ses->server->vals->version_string,
 641                    SMBDEFAULT_VERSION_STRING) == 0) {
 642                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 643                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 644                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 645                 req->DialectCount = cpu_to_le16(3);
 646                 total_len += 6;
 647         } else {
 648                 /* otherwise send specific dialect */
 649                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 650                 req->DialectCount = cpu_to_le16(1);
 651                 total_len += 2;
 652         }
 653
 654         /* only one of SMB2 signing flags may be set in SMB2 request */
 655         if (ses->sign)
 656                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 657         else if (global_secflags & CIFSSEC_MAY_SIGN)
 658                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 659         else
 660                 req->SecurityMode = 0;
 661
 662         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 663
 664         /* ClientGUID must be zero for SMB2.02 dialect */
 665         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 666                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 667         else {
 668                 memcpy(req->ClientGUID, server->client_guid,
 669                         SMB2_CLIENT_GUID_SIZE);
 670                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 671                         assemble_neg_contexts(req, &total_len);
 672         }
 673         iov[0].iov_base = (char *)req;
 674         iov[0].iov_len = total_len;
 675
 676         memset(&rqst, 0, sizeof(struct smb_rqst));
 677         rqst.rq_iov = iov;
 678         rqst.rq_nvec = 1;
 679
 680         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 681         cifs_small_buf_release(req);
 682         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 683         /*
 684          * No tcon so can't do
 685          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 686          */
 687         if (rc == -EOPNOTSUPP) {
 688                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 689                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 690                         " older servers\n");
 691                 goto neg_exit;
 692         } else if (rc != 0)
 693                 goto neg_exit;
 694
 695         if (strcmp(ses->server->vals->version_string,
 696                    SMB3ANY_VERSION_STRING) == 0) {
 697                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 698                         cifs_dbg(VFS,
 699                                 "SMB2 dialect returned but not requested\n");
 700                         return -EIO;
 701                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 702                         cifs_dbg(VFS,
 703                                 "SMB2.1 dialect returned but not requested\n");
 704                         return -EIO;
 705                 }
 706         } else if (strcmp(ses->server->vals->version_string,
 707                    SMBDEFAULT_VERSION_STRING) == 0) {
 708                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 709                         cifs_dbg(VFS,
 710                                 "SMB2 dialect returned but not requested\n");
 711                         return -EIO;
 712                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 713                         /* ops set to 3.0 by default for default so update */
 714                         ses->server->ops = &smb21_operations;
 715                 }
 716         } else if (le16_to_cpu(rsp->DialectRevision) !=
 717                                 ses->server->vals->protocol_id) {
 718                 /* if requested single dialect ensure returned dialect matched */
 719                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 720                         le16_to_cpu(rsp->DialectRevision));
 721                 return -EIO;
 722         }
 723
 724         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 725
 726         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 727                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 728         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 729                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 730         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 731                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 732         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 733                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 734         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 735                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 736         else {
 737                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 738                          le16_to_cpu(rsp->DialectRevision));
 739                 rc = -EIO;
 740                 goto neg_exit;
 741         }
 742         server->dialect = le16_to_cpu(rsp->DialectRevision);
 743
 744         /*
 745          * Keep a copy of the hash after negprot. This hash will be
 746          * the starting hash value for all sessions made from this
 747          * server.
 748          */
 749         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 750                SMB2_PREAUTH_HASH_SIZE);
 751
 752         /* SMB2 only has an extended negflavor */
 753         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 754         /* set it to the maximum buffer size value we can send with 1 credit */
 755         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 756                                SMB2_MAX_BUFFER_SIZE);
 757         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 758         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 759         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 760         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 761                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 762                                 server->sec_mode);
 763         server->capabilities = le32_to_cpu(rsp->Capabilities);
 764         /* Internal types */
 765         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 766
 767         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 768                                                (struct smb2_sync_hdr *)rsp);
 769         /*
 770          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 771          * for us will be
 772          *      ses->sectype = RawNTLMSSP;
 773          * but for time being this is our only auth choice so doesn't matter.
 774          * We just found a server which sets blob length to zero expecting raw.
 775          */
 776         if (blob_length == 0) {
 777                 cifs_dbg(FYI, "missing security blob on negprot\n");
 778                 server->sec_ntlmssp = true;
 779         }
 780
 781         rc = cifs_enable_signing(server, ses->sign);
 782         if (rc)
 783                 goto neg_exit;
 784         if (blob_length) {
 785                 rc = decode_negTokenInit(security_blob, blob_length, server);
 786                 if (rc == 1)
 787                         rc = 0;
 788                 else if (rc == 0)
 789                         rc = -EIO;
 790         }
 791
 792         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 793                 if (rsp->NegotiateContextCount)
 794                         rc = smb311_decode_neg_context(rsp, server,
 795                                                        rsp_iov.iov_len);
 796                 else
 797                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 798         }
 799 neg_exit:
 800         free_rsp_buf(resp_buftype, rsp);
 801         return rc;
 802 }
 803
 804 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 805 {
 806         int rc;
 807         struct validate_negotiate_info_req *pneg_inbuf;
 808         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 809         u32 rsplen;
 810         u32 inbuflen; /* max of 4 dialects */
 811
 812         cifs_dbg(FYI, "validate negotiate\n");
 813
 814         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 815         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 816                 return 0;
 817
 818         /*
 819          * validation ioctl must be signed, so no point sending this if we
 820          * can not sign it (ie are not known user).  Even if signing is not
 821          * required (enabled but not negotiated), in those cases we selectively
 822          * sign just this, the first and only signed request on a connection.
 823          * Having validation of negotiate info  helps reduce attack vectors.
 824          */
 825         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 826                 return 0; /* validation requires signing */
 827
 828         if (tcon->ses->user_name == NULL) {
 829                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 830                 return 0; /* validation requires signing */
 831         }
 832
 833         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 834                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 835
 836         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 837         if (!pneg_inbuf)
 838                 return -ENOMEM;
 839
 840         pneg_inbuf->Capabilities =
 841                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 842         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 843                                         SMB2_CLIENT_GUID_SIZE);
 844
 845         if (tcon->ses->sign)
 846                 pneg_inbuf->SecurityMode =
 847                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 848         else if (global_secflags & CIFSSEC_MAY_SIGN)
 849                 pneg_inbuf->SecurityMode =
 850                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 851         else
 852                 pneg_inbuf->SecurityMode = 0;
 853
 854
 855         if (strcmp(tcon->ses->server->vals->version_string,
 856                 SMB3ANY_VERSION_STRING) == 0) {
 857                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 858                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 859                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 860                 /* structure is big enough for 3 dialects, sending only 2 */
 861                 inbuflen = sizeof(*pneg_inbuf) -
 862                                 sizeof(pneg_inbuf->Dialects[0]);
 863         } else if (strcmp(tcon->ses->server->vals->version_string,
 864                 SMBDEFAULT_VERSION_STRING) == 0) {
 865                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 866                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 867                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 868                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 869                 /* structure is big enough for 3 dialects */
 870                 inbuflen = sizeof(*pneg_inbuf);
 871         } else {
 872                 /* otherwise specific dialect was requested */
 873                 pneg_inbuf->Dialects[0] =
 874                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 875                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 876                 /* structure is big enough for 3 dialects, sending only 1 */
 877                 inbuflen = sizeof(*pneg_inbuf) -
 878                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 879         }
 880
 881         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 882                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 883                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 884
 885         if (rc != 0) {
 886                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 887                 rc = -EIO;
 888                 goto out_free_inbuf;
 889         }
 890
 891         rc = -EIO;
 892         if (rsplen != sizeof(*pneg_rsp)) {
 893                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 894                          rsplen);
 895
 896                 /* relax check since Mac returns max bufsize allowed on ioctl */
 897                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 898                         goto out_free_rsp;
 899         }
 900
 901         /* check validate negotiate info response matches what we got earlier */
 902         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 903                 goto vneg_out;
 904
 905         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 906                 goto vneg_out;
 907
 908         /* do not validate server guid because not saved at negprot time yet */
 909
 910         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 911               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 912                 goto vneg_out;
 913
 914         /* validate negotiate successful */
 915         rc = 0;
 916         cifs_dbg(FYI, "validate negotiate info successful\n");
 917         goto out_free_rsp;
 918
 919 vneg_out:
 920         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 921 out_free_rsp:
 922         kfree(pneg_rsp);
 923 out_free_inbuf:
 924         kfree(pneg_inbuf);
 925         return rc;
 926 }
 927
 928 enum securityEnum
 929 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 930 {
 931         switch (requested) {
 932         case Kerberos:
 933         case RawNTLMSSP:
 934                 return requested;
 935         case NTLMv2:
 936                 return RawNTLMSSP;
 937         case Unspecified:
 938                 if (server->sec_ntlmssp &&
 939                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 940                         return RawNTLMSSP;
 941                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 942                         (global_secflags & CIFSSEC_MAY_KRB5))
 943                         return Kerberos;
 944                 /* Fallthrough */
 945         default:
 946                 return Unspecified;
 947         }
 948 }
 949
 950 struct SMB2_sess_data {
 951         unsigned int xid;
 952         struct cifs_ses *ses;
 953         struct nls_table *nls_cp;
 954         void (*func)(struct SMB2_sess_data *);
 955         int result;
 956         u64 previous_session;
 957
 958         /* we will send the SMB in three pieces:
 959          * a fixed length beginning part, an optional
 960          * SPNEGO blob (which can be zero length), and a
 961          * last part which will include the strings
 962          * and rest of bcc area. This allows us to avoid
 963          * a large buffer 17K allocation
 964          */
 965         int buf0_type;
 966         struct kvec iov[2];
 967 };
 968
 969 static int
 970 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 971 {
 972         int rc;
 973         struct cifs_ses *ses = sess_data->ses;
 974         struct smb2_sess_setup_req *req;
 975         struct TCP_Server_Info *server = ses->server;
 976         unsigned int total_len;
 977
 978         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 979                              &total_len);
 980         if (rc)
 981                 return rc;
 982
 983         /* First session, not a reauthenticate */
 984         req->sync_hdr.SessionId = 0;
 985
 986         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 987         req->PreviousSessionId = sess_data->previous_session;
 988
 989         req->Flags = 0; /* MBZ */
 990
 991         /* enough to enable echos and oplocks and one max size write */
 992         req->sync_hdr.CreditRequest = cpu_to_le16(130);
 993
 994         /* only one of SMB2 signing flags may be set in SMB2 request */
 995         if (server->sign)
 996                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 997         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 998                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 999         else
1000                 req->SecurityMode = 0;
1001
1002         req->Capabilities = 0;
1003         req->Channel = 0; /* MBZ */
1004
1005         sess_data->iov[0].iov_base = (char *)req;
1006         /* 1 for pad */
1007         sess_data->iov[0].iov_len = total_len - 1;
1008         /*
1009          * This variable will be used to clear the buffer
1010          * allocated above in case of any error in the calling function.
1011          */
1012         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1013
1014         return 0;
1015 }
1016
1017 static void
1018 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1019 {
1020         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1021         sess_data->buf0_type = CIFS_NO_BUFFER;
1022 }
1023
1024 static int
1025 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1026 {
1027         int rc;
1028         struct smb_rqst rqst;
1029         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1030         struct kvec rsp_iov = { NULL, 0 };
1031
1032         /* Testing shows that buffer offset must be at location of Buffer[0] */
1033         req->SecurityBufferOffset =
1034                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1035         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1036
1037         memset(&rqst, 0, sizeof(struct smb_rqst));
1038         rqst.rq_iov = sess_data->iov;
1039         rqst.rq_nvec = 2;
1040
1041         /* BB add code to build os and lm fields */
1042         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1043                             &rqst,
1044                             &sess_data->buf0_type,
1045                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1046         cifs_small_buf_release(sess_data->iov[0].iov_base);
1047         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1048
1049         return rc;
1050 }
1051
1052 static int
1053 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1054 {
1055         int rc = 0;
1056         struct cifs_ses *ses = sess_data->ses;
1057
1058         mutex_lock(&ses->server->srv_mutex);
1059         if (ses->server->ops->generate_signingkey) {
1060                 rc = ses->server->ops->generate_signingkey(ses);
1061                 if (rc) {
1062                         cifs_dbg(FYI,
1063                                 "SMB3 session key generation failed\n");
1064                         mutex_unlock(&ses->server->srv_mutex);
1065                         return rc;
1066                 }
1067         }
1068         if (!ses->server->session_estab) {
1069                 ses->server->sequence_number = 0x2;
1070                 ses->server->session_estab = true;
1071         }
1072         mutex_unlock(&ses->server->srv_mutex);
1073
1074         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1075         spin_lock(&GlobalMid_Lock);
1076         ses->status = CifsGood;
1077         ses->need_reconnect = false;
1078         spin_unlock(&GlobalMid_Lock);
1079         return rc;
1080 }
1081
1082 #ifdef CONFIG_CIFS_UPCALL
1083 static void
1084 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1085 {
1086         int rc;
1087         struct cifs_ses *ses = sess_data->ses;
1088         struct cifs_spnego_msg *msg;
1089         struct key *spnego_key = NULL;
1090         struct smb2_sess_setup_rsp *rsp = NULL;
1091
1092         rc = SMB2_sess_alloc_buffer(sess_data);
1093         if (rc)
1094                 goto out;
1095
1096         spnego_key = cifs_get_spnego_key(ses);
1097         if (IS_ERR(spnego_key)) {
1098                 rc = PTR_ERR(spnego_key);
1099                 spnego_key = NULL;
1100                 goto out;
1101         }
1102
1103         msg = spnego_key->payload.data[0];
1104         /*
1105          * check version field to make sure that cifs.upcall is
1106          * sending us a response in an expected form
1107          */
1108         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1109                 cifs_dbg(VFS,
1110                           "bad cifs.upcall version. Expected %d got %d",
1111                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1112                 rc = -EKEYREJECTED;
1113                 goto out_put_spnego_key;
1114         }
1115
1116         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1117                                          GFP_KERNEL);
1118         if (!ses->auth_key.response) {
1119                 cifs_dbg(VFS,
1120                         "Kerberos can't allocate (%u bytes) memory",
1121                         msg->sesskey_len);
1122                 rc = -ENOMEM;
1123                 goto out_put_spnego_key;
1124         }
1125         ses->auth_key.len = msg->sesskey_len;
1126
1127         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1128         sess_data->iov[1].iov_len = msg->secblob_len;
1129
1130         rc = SMB2_sess_sendreceive(sess_data);
1131         if (rc)
1132                 goto out_put_spnego_key;
1133
1134         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1135         ses->Suid = rsp->sync_hdr.SessionId;
1136
1137         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1138
1139         rc = SMB2_sess_establish_session(sess_data);
1140 out_put_spnego_key:
1141         key_invalidate(spnego_key);
1142         key_put(spnego_key);
1143 out:
1144         sess_data->result = rc;
1145         sess_data->func = NULL;
1146         SMB2_sess_free_buffer(sess_data);
1147 }
1148 #else
1149 static void
1150 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1151 {
1152         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1153         sess_data->result = -EOPNOTSUPP;
1154         sess_data->func = NULL;
1155 }
1156 #endif
1157
1158 static void
1159 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1160
1161 static void
1162 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1163 {
1164         int rc;
1165         struct cifs_ses *ses = sess_data->ses;
1166         struct smb2_sess_setup_rsp *rsp = NULL;
1167         char *ntlmssp_blob = NULL;
1168         bool use_spnego = false; /* else use raw ntlmssp */
1169         u16 blob_length = 0;
1170
1171         /*
1172          * If memory allocation is successful, caller of this function
1173          * frees it.
1174          */
1175         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1176         if (!ses->ntlmssp) {
1177                 rc = -ENOMEM;
1178                 goto out_err;
1179         }
1180         ses->ntlmssp->sesskey_per_smbsess = true;
1181
1182         rc = SMB2_sess_alloc_buffer(sess_data);
1183         if (rc)
1184                 goto out_err;
1185
1186         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1187                                GFP_KERNEL);
1188         if (ntlmssp_blob == NULL) {
1189                 rc = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1194         if (use_spnego) {
1195                 /* BB eventually need to add this */
1196                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1197                 rc = -EOPNOTSUPP;
1198                 goto out;
1199         } else {
1200                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1201                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1202         }
1203         sess_data->iov[1].iov_base = ntlmssp_blob;
1204         sess_data->iov[1].iov_len = blob_length;
1205
1206         rc = SMB2_sess_sendreceive(sess_data);
1207         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1208
1209         /* If true, rc here is expected and not an error */
1210         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1211                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1212                 rc = 0;
1213
1214         if (rc)
1215                 goto out;
1216
1217         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1218                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1219                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1220                         le16_to_cpu(rsp->SecurityBufferOffset));
1221                 rc = -EIO;
1222                 goto out;
1223         }
1224         rc = decode_ntlmssp_challenge(rsp->Buffer,
1225                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1226         if (rc)
1227                 goto out;
1228
1229         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1230
1231
1232         ses->Suid = rsp->sync_hdr.SessionId;
1233         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234
1235 out:
1236         kfree(ntlmssp_blob);
1237         SMB2_sess_free_buffer(sess_data);
1238         if (!rc) {
1239                 sess_data->result = 0;
1240                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1241                 return;
1242         }
1243 out_err:
1244         kfree(ses->ntlmssp);
1245         ses->ntlmssp = NULL;
1246         sess_data->result = rc;
1247         sess_data->func = NULL;
1248 }
1249
1250 static void
1251 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1252 {
1253         int rc;
1254         struct cifs_ses *ses = sess_data->ses;
1255         struct smb2_sess_setup_req *req;
1256         struct smb2_sess_setup_rsp *rsp = NULL;
1257         unsigned char *ntlmssp_blob = NULL;
1258         bool use_spnego = false; /* else use raw ntlmssp */
1259         u16 blob_length = 0;
1260
1261         rc = SMB2_sess_alloc_buffer(sess_data);
1262         if (rc)
1263                 goto out;
1264
1265         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1266         req->sync_hdr.SessionId = ses->Suid;
1267
1268         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1269                                         sess_data->nls_cp);
1270         if (rc) {
1271                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1272                 goto out;
1273         }
1274
1275         if (use_spnego) {
1276                 /* BB eventually need to add this */
1277                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1278                 rc = -EOPNOTSUPP;
1279                 goto out;
1280         }
1281         sess_data->iov[1].iov_base = ntlmssp_blob;
1282         sess_data->iov[1].iov_len = blob_length;
1283
1284         rc = SMB2_sess_sendreceive(sess_data);
1285         if (rc)
1286                 goto out;
1287
1288         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1289
1290         ses->Suid = rsp->sync_hdr.SessionId;
1291         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1292
1293         rc = SMB2_sess_establish_session(sess_data);
1294 out:
1295         kfree(ntlmssp_blob);
1296         SMB2_sess_free_buffer(sess_data);
1297         kfree(ses->ntlmssp);
1298         ses->ntlmssp = NULL;
1299         sess_data->result = rc;
1300         sess_data->func = NULL;
1301 }
1302
1303 static int
1304 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1305 {
1306         int type;
1307
1308         type = smb2_select_sectype(ses->server, ses->sectype);
1309         cifs_dbg(FYI, "sess setup type %d\n", type);
1310         if (type == Unspecified) {
1311                 cifs_dbg(VFS,
1312                         "Unable to select appropriate authentication method!");
1313                 return -EINVAL;
1314         }
1315
1316         switch (type) {
1317         case Kerberos:
1318                 sess_data->func = SMB2_auth_kerberos;
1319                 break;
1320         case RawNTLMSSP:
1321                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1322                 break;
1323         default:
1324                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1325                 return -EOPNOTSUPP;
1326         }
1327
1328         return 0;
1329 }
1330
1331 int
1332 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1333                 const struct nls_table *nls_cp)
1334 {
1335         int rc = 0;
1336         struct TCP_Server_Info *server = ses->server;
1337         struct SMB2_sess_data *sess_data;
1338
1339         cifs_dbg(FYI, "Session Setup\n");
1340
1341         if (!server) {
1342                 WARN(1, "%s: server is NULL!\n", __func__);
1343                 return -EIO;
1344         }
1345
1346         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1347         if (!sess_data)
1348                 return -ENOMEM;
1349
1350         rc = SMB2_select_sec(ses, sess_data);
1351         if (rc)
1352                 goto out;
1353         sess_data->xid = xid;
1354         sess_data->ses = ses;
1355         sess_data->buf0_type = CIFS_NO_BUFFER;
1356         sess_data->nls_cp = (struct nls_table *) nls_cp;
1357         sess_data->previous_session = ses->Suid;
1358
1359         /*
1360          * Initialize the session hash with the server one.
1361          */
1362         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1363                SMB2_PREAUTH_HASH_SIZE);
1364
1365         while (sess_data->func)
1366                 sess_data->func(sess_data);
1367
1368         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1369                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1370         rc = sess_data->result;
1371 out:
1372         kfree(sess_data);
1373         return rc;
1374 }
1375
1376 int
1377 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1378 {
1379         struct smb_rqst rqst;
1380         struct smb2_logoff_req *req; /* response is also trivial struct */
1381         int rc = 0;
1382         struct TCP_Server_Info *server;
1383         int flags = 0;
1384         unsigned int total_len;
1385         struct kvec iov[1];
1386         struct kvec rsp_iov;
1387         int resp_buf_type;
1388
1389         cifs_dbg(FYI, "disconnect session %p\n", ses);
1390
1391         if (ses && (ses->server))
1392                 server = ses->server;
1393         else
1394                 return -EIO;
1395
1396         /* no need to send SMB logoff if uid already closed due to reconnect */
1397         if (ses->need_reconnect)
1398                 goto smb2_session_already_dead;
1399
1400         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1401         if (rc)
1402                 return rc;
1403
1404          /* since no tcon, smb2_init can not do this, so do here */
1405         req->sync_hdr.SessionId = ses->Suid;
1406
1407         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1408                 flags |= CIFS_TRANSFORM_REQ;
1409         else if (server->sign)
1410                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1411
1412         flags |= CIFS_NO_RESP;
1413
1414         iov[0].iov_base = (char *)req;
1415         iov[0].iov_len = total_len;
1416
1417         memset(&rqst, 0, sizeof(struct smb_rqst));
1418         rqst.rq_iov = iov;
1419         rqst.rq_nvec = 1;
1420
1421         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1422         cifs_small_buf_release(req);
1423         /*
1424          * No tcon so can't do
1425          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1426          */
1427
1428 smb2_session_already_dead:
1429         return rc;
1430 }
1431
1432 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1433 {
1434         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1435 }
1436
1437 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1438
1439 /* These are similar values to what Windows uses */
1440 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1441 {
1442         tcon->max_chunks = 256;
1443         tcon->max_bytes_chunk = 1048576;
1444         tcon->max_bytes_copy = 16777216;
1445 }
1446
1447 int
1448 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1449           struct cifs_tcon *tcon, const struct nls_table *cp)
1450 {
1451         struct smb_rqst rqst;
1452         struct smb2_tree_connect_req *req;
1453         struct smb2_tree_connect_rsp *rsp = NULL;
1454         struct kvec iov[2];
1455         struct kvec rsp_iov = { NULL, 0 };
1456         int rc = 0;
1457         int resp_buftype;
1458         int unc_path_len;
1459         __le16 *unc_path = NULL;
1460         int flags = 0;
1461         unsigned int total_len;
1462
1463         cifs_dbg(FYI, "TCON\n");
1464
1465         if (!(ses->server) || !tree)
1466                 return -EIO;
1467
1468         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1469         if (unc_path == NULL)
1470                 return -ENOMEM;
1471
1472         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1473         unc_path_len *= 2;
1474         if (unc_path_len < 2) {
1475                 kfree(unc_path);
1476                 return -EINVAL;
1477         }
1478
1479         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1480         tcon->tid = 0;
1481
1482         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1483                              &total_len);
1484         if (rc) {
1485                 kfree(unc_path);
1486                 return rc;
1487         }
1488
1489         if (smb3_encryption_required(tcon))
1490                 flags |= CIFS_TRANSFORM_REQ;
1491
1492         iov[0].iov_base = (char *)req;
1493         /* 1 for pad */
1494         iov[0].iov_len = total_len - 1;
1495
1496         /* Testing shows that buffer offset must be at location of Buffer[0] */
1497         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1498                         - 1 /* pad */);
1499         req->PathLength = cpu_to_le16(unc_path_len - 2);
1500         iov[1].iov_base = unc_path;
1501         iov[1].iov_len = unc_path_len;
1502
1503         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1504         if ((ses->server->dialect == SMB311_PROT_ID) &&
1505             !smb3_encryption_required(tcon))
1506                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507
1508         memset(&rqst, 0, sizeof(struct smb_rqst));
1509         rqst.rq_iov = iov;
1510         rqst.rq_nvec = 2;
1511
1512         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1513         cifs_small_buf_release(req);
1514         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1515
1516         if (rc != 0) {
1517                 if (tcon) {
1518                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519                         tcon->need_reconnect = true;
1520                 }
1521                 goto tcon_error_exit;
1522         }
1523
1524         switch (rsp->ShareType) {
1525         case SMB2_SHARE_TYPE_DISK:
1526                 cifs_dbg(FYI, "connection to disk share\n");
1527                 break;
1528         case SMB2_SHARE_TYPE_PIPE:
1529                 tcon->pipe = true;
1530                 cifs_dbg(FYI, "connection to pipe share\n");
1531                 break;
1532         case SMB2_SHARE_TYPE_PRINT:
1533                 tcon->print = true;
1534                 cifs_dbg(FYI, "connection to printer\n");
1535                 break;
1536         default:
1537                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538                 rc = -EOPNOTSUPP;
1539                 goto tcon_error_exit;
1540         }
1541
1542         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545         tcon->tidStatus = CifsGood;
1546         tcon->need_reconnect = false;
1547         tcon->tid = rsp->sync_hdr.TreeId;
1548         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549
1550         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553
1554         if (tcon->seal &&
1555             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557
1558         init_copy_chunk_defaults(tcon);
1559         if (tcon->ses->server->ops->validate_negotiate)
1560                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561 tcon_exit:
1562         free_rsp_buf(resp_buftype, rsp);
1563         kfree(unc_path);
1564         return rc;
1565
1566 tcon_error_exit:
1567         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1568                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1569         }
1570         goto tcon_exit;
1571 }
1572
1573 int
1574 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1575 {
1576         struct smb_rqst rqst;
1577         struct smb2_tree_disconnect_req *req; /* response is trivial */
1578         int rc = 0;
1579         struct cifs_ses *ses = tcon->ses;
1580         int flags = 0;
1581         unsigned int total_len;
1582         struct kvec iov[1];
1583         struct kvec rsp_iov;
1584         int resp_buf_type;
1585
1586         cifs_dbg(FYI, "Tree Disconnect\n");
1587
1588         if (!ses || !(ses->server))
1589                 return -EIO;
1590
1591         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1592                 return 0;
1593
1594         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1595                              &total_len);
1596         if (rc)
1597                 return rc;
1598
1599         if (smb3_encryption_required(tcon))
1600                 flags |= CIFS_TRANSFORM_REQ;
1601
1602         flags |= CIFS_NO_RESP;
1603
1604         iov[0].iov_base = (char *)req;
1605         iov[0].iov_len = total_len;
1606
1607         memset(&rqst, 0, sizeof(struct smb_rqst));
1608         rqst.rq_iov = iov;
1609         rqst.rq_nvec = 1;
1610
1611         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1612         cifs_small_buf_release(req);
1613         if (rc)
1614                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1615
1616         return rc;
1617 }
1618
1619
1620 static struct create_durable *
1621 create_durable_buf(void)
1622 {
1623         struct create_durable *buf;
1624
1625         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1626         if (!buf)
1627                 return NULL;
1628
1629         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1630                                         (struct create_durable, Data));
1631         buf->ccontext.DataLength = cpu_to_le32(16);
1632         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1633                                 (struct create_durable, Name));
1634         buf->ccontext.NameLength = cpu_to_le16(4);
1635         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1636         buf->Name[0] = 'D';
1637         buf->Name[1] = 'H';
1638         buf->Name[2] = 'n';
1639         buf->Name[3] = 'Q';
1640         return buf;
1641 }
1642
1643 static struct create_durable *
1644 create_reconnect_durable_buf(struct cifs_fid *fid)
1645 {
1646         struct create_durable *buf;
1647
1648         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1649         if (!buf)
1650                 return NULL;
1651
1652         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1653                                         (struct create_durable, Data));
1654         buf->ccontext.DataLength = cpu_to_le32(16);
1655         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1656                                 (struct create_durable, Name));
1657         buf->ccontext.NameLength = cpu_to_le16(4);
1658         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1659         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1660         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1661         buf->Name[0] = 'D';
1662         buf->Name[1] = 'H';
1663         buf->Name[2] = 'n';
1664         buf->Name[3] = 'C';
1665         return buf;
1666 }
1667
1668 static __u8
1669 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1670                   unsigned int *epoch, char *lease_key)
1671 {
1672         char *data_offset;
1673         struct create_context *cc;
1674         unsigned int next;
1675         unsigned int remaining;
1676         char *name;
1677
1678         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1679         remaining = le32_to_cpu(rsp->CreateContextsLength);
1680         cc = (struct create_context *)data_offset;
1681         while (remaining >= sizeof(struct create_context)) {
1682                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1683                 if (le16_to_cpu(cc->NameLength) == 4 &&
1684                     strncmp(name, "RqLs", 4) == 0)
1685                         return server->ops->parse_lease_buf(cc, epoch,
1686                                                             lease_key);
1687
1688                 next = le32_to_cpu(cc->Next);
1689                 if (!next)
1690                         break;
1691                 remaining -= next;
1692                 cc = (struct create_context *)((char *)cc + next);
1693         }
1694
1695         return 0;
1696 }
1697
1698 static int
1699 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1700                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1701 {
1702         struct smb2_create_req *req = iov[0].iov_base;
1703         unsigned int num = *num_iovec;
1704
1705         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1706         if (iov[num].iov_base == NULL)
1707                 return -ENOMEM;
1708         iov[num].iov_len = server->vals->create_lease_size;
1709         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1710         if (!req->CreateContextsOffset)
1711                 req->CreateContextsOffset = cpu_to_le32(
1712                                 sizeof(struct smb2_create_req) +
1713                                 iov[num - 1].iov_len);
1714         le32_add_cpu(&req->CreateContextsLength,
1715                      server->vals->create_lease_size);
1716         *num_iovec = num + 1;
1717         return 0;
1718 }
1719
1720 static struct create_durable_v2 *
1721 create_durable_v2_buf(struct cifs_fid *pfid)
1722 {
1723         struct create_durable_v2 *buf;
1724
1725         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1726         if (!buf)
1727                 return NULL;
1728
1729         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1730                                         (struct create_durable_v2, dcontext));
1731         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1732         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1733                                 (struct create_durable_v2, Name));
1734         buf->ccontext.NameLength = cpu_to_le16(4);
1735
1736         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1737         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1738         generate_random_uuid(buf->dcontext.CreateGuid);
1739         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1740
1741         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1742         buf->Name[0] = 'D';
1743         buf->Name[1] = 'H';
1744         buf->Name[2] = '2';
1745         buf->Name[3] = 'Q';
1746         return buf;
1747 }
1748
1749 static struct create_durable_handle_reconnect_v2 *
1750 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1751 {
1752         struct create_durable_handle_reconnect_v2 *buf;
1753
1754         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1755                         GFP_KERNEL);
1756         if (!buf)
1757                 return NULL;
1758
1759         buf->ccontext.DataOffset =
1760                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1761                                      dcontext));
1762         buf->ccontext.DataLength =
1763                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1764         buf->ccontext.NameOffset =
1765                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1766                             Name));
1767         buf->ccontext.NameLength = cpu_to_le16(4);
1768
1769         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1770         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1771         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1772         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1773
1774         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1775         buf->Name[0] = 'D';
1776         buf->Name[1] = 'H';
1777         buf->Name[2] = '2';
1778         buf->Name[3] = 'C';
1779         return buf;
1780 }
1781
1782 static int
1783 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1784                     struct cifs_open_parms *oparms)
1785 {
1786         struct smb2_create_req *req = iov[0].iov_base;
1787         unsigned int num = *num_iovec;
1788
1789         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1790         if (iov[num].iov_base == NULL)
1791                 return -ENOMEM;
1792         iov[num].iov_len = sizeof(struct create_durable_v2);
1793         if (!req->CreateContextsOffset)
1794                 req->CreateContextsOffset =
1795                         cpu_to_le32(sizeof(struct smb2_create_req) +
1796                                                                 iov[1].iov_len);
1797         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1798         *num_iovec = num + 1;
1799         return 0;
1800 }
1801
1802 static int
1803 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1804                     struct cifs_open_parms *oparms)
1805 {
1806         struct smb2_create_req *req = iov[0].iov_base;
1807         unsigned int num = *num_iovec;
1808
1809         /* indicate that we don't need to relock the file */
1810         oparms->reconnect = false;
1811
1812         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1813         if (iov[num].iov_base == NULL)
1814                 return -ENOMEM;
1815         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1816         if (!req->CreateContextsOffset)
1817                 req->CreateContextsOffset =
1818                         cpu_to_le32(sizeof(struct smb2_create_req) +
1819                                                                 iov[1].iov_len);
1820         le32_add_cpu(&req->CreateContextsLength,
1821                         sizeof(struct create_durable_handle_reconnect_v2));
1822         *num_iovec = num + 1;
1823         return 0;
1824 }
1825
1826 static int
1827 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1828                     struct cifs_open_parms *oparms, bool use_persistent)
1829 {
1830         struct smb2_create_req *req = iov[0].iov_base;
1831         unsigned int num = *num_iovec;
1832
1833         if (use_persistent) {
1834                 if (oparms->reconnect)
1835                         return add_durable_reconnect_v2_context(iov, num_iovec,
1836                                                                 oparms);
1837                 else
1838                         return add_durable_v2_context(iov, num_iovec, oparms);
1839         }
1840
1841         if (oparms->reconnect) {
1842                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1843                 /* indicate that we don't need to relock the file */
1844                 oparms->reconnect = false;
1845         } else
1846                 iov[num].iov_base = create_durable_buf();
1847         if (iov[num].iov_base == NULL)
1848                 return -ENOMEM;
1849         iov[num].iov_len = sizeof(struct create_durable);
1850         if (!req->CreateContextsOffset)
1851                 req->CreateContextsOffset =
1852                         cpu_to_le32(sizeof(struct smb2_create_req) +
1853                                                                 iov[1].iov_len);
1854         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1855         *num_iovec = num + 1;
1856         return 0;
1857 }
1858
1859 static int
1860 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1861                             const char *treename, const __le16 *path)
1862 {
1863         int treename_len, path_len;
1864         struct nls_table *cp;
1865         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1866
1867         /*
1868          * skip leading "\\"
1869          */
1870         treename_len = strlen(treename);
1871         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1872                 return -EINVAL;
1873
1874         treename += 2;
1875         treename_len -= 2;
1876
1877         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1878
1879         /*
1880          * make room for one path separator between the treename and
1881          * path
1882          */
1883         *out_len = treename_len + 1 + path_len;
1884
1885         /*
1886          * final path needs to be null-terminated UTF16 with a
1887          * size aligned to 8
1888          */
1889
1890         *out_size = roundup((*out_len+1)*2, 8);
1891         *out_path = kzalloc(*out_size, GFP_KERNEL);
1892         if (!*out_path)
1893                 return -ENOMEM;
1894
1895         cp = load_nls_default();
1896         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1897         UniStrcat(*out_path, sep);
1898         UniStrcat(*out_path, path);
1899         unload_nls(cp);
1900
1901         return 0;
1902 }
1903
1904 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1905                                umode_t mode, struct cifs_tcon *tcon,
1906                                const char *full_path,
1907                                struct cifs_sb_info *cifs_sb)
1908 {
1909         struct smb_rqst rqst;
1910         struct smb2_create_req *req;
1911         struct smb2_create_rsp *rsp = NULL;
1912         struct TCP_Server_Info *server;
1913         struct cifs_ses *ses = tcon->ses;
1914         struct kvec iov[3]; /* make sure at least one for each open context */
1915         struct kvec rsp_iov = {NULL, 0};
1916         int resp_buftype;
1917         int uni_path_len;
1918         __le16 *copy_path = NULL;
1919         int copy_size;
1920         int rc = 0;
1921         unsigned int n_iov = 2;
1922         __u32 file_attributes = 0;
1923         char *pc_buf = NULL;
1924         int flags = 0;
1925         unsigned int total_len;
1926         __le16 *utf16_path = NULL;
1927
1928         cifs_dbg(FYI, "mkdir\n");
1929
1930         /* resource #1: path allocation */
1931         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1932         if (!utf16_path)
1933                 return -ENOMEM;
1934
1935         if (ses && (ses->server))
1936                 server = ses->server;
1937         else {
1938                 rc = -EIO;
1939                 goto err_free_path;
1940         }
1941
1942         /* resource #2: request */
1943         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1944         if (rc)
1945                 goto err_free_path;
1946
1947
1948         if (smb3_encryption_required(tcon))
1949                 flags |= CIFS_TRANSFORM_REQ;
1950
1951         req->ImpersonationLevel = IL_IMPERSONATION;
1952         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1953         /* File attributes ignored on open (used in create though) */
1954         req->FileAttributes = cpu_to_le32(file_attributes);
1955         req->ShareAccess = FILE_SHARE_ALL_LE;
1956         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
1957         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
1958
1959         iov[0].iov_base = (char *)req;
1960         /* -1 since last byte is buf[0] which is sent below (path) */
1961         iov[0].iov_len = total_len - 1;
1962
1963         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1964
1965         /* [MS-SMB2] 2.2.13 NameOffset:
1966          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1967          * the SMB2 header, the file name includes a prefix that will
1968          * be processed during DFS name normalization as specified in
1969          * section 3.3.5.9. Otherwise, the file name is relative to
1970          * the share that is identified by the TreeId in the SMB2
1971          * header.
1972          */
1973         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1974                 int name_len;
1975
1976                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1977                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1978                                                  &name_len,
1979                                                  tcon->treeName, utf16_path);
1980                 if (rc)
1981                         goto err_free_req;
1982
1983                 req->NameLength = cpu_to_le16(name_len * 2);
1984                 uni_path_len = copy_size;
1985                 /* free before overwriting resource */
1986                 kfree(utf16_path);
1987                 utf16_path = copy_path;
1988         } else {
1989                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
1990                 /* MUST set path len (NameLength) to 0 opening root of share */
1991                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1992                 if (uni_path_len % 8 != 0) {
1993                         copy_size = roundup(uni_path_len, 8);
1994                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1995                         if (!copy_path) {
1996                                 rc = -ENOMEM;
1997                                 goto err_free_req;
1998                         }
1999                         memcpy((char *)copy_path, (const char *)utf16_path,
2000                                uni_path_len);
2001                         uni_path_len = copy_size;
2002                         /* free before overwriting resource */
2003                         kfree(utf16_path);
2004                         utf16_path = copy_path;
2005                 }
2006         }
2007
2008         iov[1].iov_len = uni_path_len;
2009         iov[1].iov_base = utf16_path;
2010         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2011
2012         if (tcon->posix_extensions) {
2013                 /* resource #3: posix buf */
2014                 rc = add_posix_context(iov, &n_iov, mode);
2015                 if (rc)
2016                         goto err_free_req;
2017                 pc_buf = iov[n_iov-1].iov_base;
2018         }
2019
2020
2021         memset(&rqst, 0, sizeof(struct smb_rqst));
2022         rqst.rq_iov = iov;
2023         rqst.rq_nvec = n_iov;
2024
2025         /* resource #4: response buffer */
2026         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2027         if (rc) {
2028                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2029                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2030                                            CREATE_NOT_FILE,
2031                                            FILE_WRITE_ATTRIBUTES, rc);
2032                 goto err_free_rsp_buf;
2033         }
2034
2035         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2036         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2037                                     ses->Suid, CREATE_NOT_FILE,
2038                                     FILE_WRITE_ATTRIBUTES);
2039
2040         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2041
2042         /* Eventually save off posix specific response info and timestaps */
2043
2044 err_free_rsp_buf:
2045         free_rsp_buf(resp_buftype, rsp);
2046         kfree(pc_buf);
2047 err_free_req:
2048         cifs_small_buf_release(req);
2049 err_free_path:
2050         kfree(utf16_path);
2051         return rc;
2052 }
2053
2054 int
2055 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2056                struct cifs_open_parms *oparms, __le16 *path)
2057 {
2058         struct TCP_Server_Info *server = tcon->ses->server;
2059         struct smb2_create_req *req;
2060         unsigned int n_iov = 2;
2061         __u32 file_attributes = 0;
2062         int copy_size;
2063         int uni_path_len;
2064         unsigned int total_len;
2065         struct kvec *iov = rqst->rq_iov;
2066         __le16 *copy_path;
2067         int rc;
2068
2069         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2070         if (rc)
2071                 return rc;
2072
2073         iov[0].iov_base = (char *)req;
2074         /* -1 since last byte is buf[0] which is sent below (path) */
2075         iov[0].iov_len = total_len - 1;
2076
2077         if (oparms->create_options & CREATE_OPTION_READONLY)
2078                 file_attributes |= ATTR_READONLY;
2079         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2080                 file_attributes |= ATTR_SYSTEM;
2081
2082         req->ImpersonationLevel = IL_IMPERSONATION;
2083         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2084         /* File attributes ignored on open (used in create though) */
2085         req->FileAttributes = cpu_to_le32(file_attributes);
2086         req->ShareAccess = FILE_SHARE_ALL_LE;
2087         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2088         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2089         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2090
2091         /* [MS-SMB2] 2.2.13 NameOffset:
2092          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2093          * the SMB2 header, the file name includes a prefix that will
2094          * be processed during DFS name normalization as specified in
2095          * section 3.3.5.9. Otherwise, the file name is relative to
2096          * the share that is identified by the TreeId in the SMB2
2097          * header.
2098          */
2099         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2100                 int name_len;
2101
2102                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2103                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2104                                                  &name_len,
2105                                                  tcon->treeName, path);
2106                 if (rc)
2107                         return rc;
2108                 req->NameLength = cpu_to_le16(name_len * 2);
2109                 uni_path_len = copy_size;
2110                 path = copy_path;
2111         } else {
2112                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2113                 /* MUST set path len (NameLength) to 0 opening root of share */
2114                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2115                 copy_size = uni_path_len;
2116                 if (copy_size % 8 != 0)
2117                         copy_size = roundup(copy_size, 8);
2118                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2119                 if (!copy_path)
2120                         return -ENOMEM;
2121                 memcpy((char *)copy_path, (const char *)path,
2122                        uni_path_len);
2123                 uni_path_len = copy_size;
2124                 path = copy_path;
2125         }
2126
2127         iov[1].iov_len = uni_path_len;
2128         iov[1].iov_base = path;
2129
2130         if (!server->oplocks)
2131                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2132
2133         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2134             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2135                 req->RequestedOplockLevel = *oplock;
2136         else {
2137                 rc = add_lease_context(server, iov, &n_iov,
2138                                        oparms->fid->lease_key, oplock);
2139                 if (rc)
2140                         return rc;
2141         }
2142
2143         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2144                 /* need to set Next field of lease context if we request it */
2145                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2146                         struct create_context *ccontext =
2147                             (struct create_context *)iov[n_iov-1].iov_base;
2148                         ccontext->Next =
2149                                 cpu_to_le32(server->vals->create_lease_size);
2150                 }
2151
2152                 rc = add_durable_context(iov, &n_iov, oparms,
2153                                         tcon->use_persistent);
2154                 if (rc)
2155                         return rc;
2156         }
2157
2158         if (tcon->posix_extensions) {
2159                 if (n_iov > 2) {
2160                         struct create_context *ccontext =
2161                             (struct create_context *)iov[n_iov-1].iov_base;
2162                         ccontext->Next =
2163                                 cpu_to_le32(iov[n_iov-1].iov_len);
2164                 }
2165
2166                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2167                 if (rc)
2168                         return rc;
2169         }
2170
2171         rqst->rq_nvec = n_iov;
2172         return 0;
2173 }
2174
2175 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2176  * All other vectors are freed by kfree().
2177  */
2178 void
2179 SMB2_open_free(struct smb_rqst *rqst)
2180 {
2181         int i;
2182
2183         cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2184         for (i = 1; i < rqst->rq_nvec; i++)
2185                 kfree(rqst->rq_iov[i].iov_base);
2186 }
2187
2188 int
2189 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2190           __u8 *oplock, struct smb2_file_all_info *buf,
2191           struct kvec *err_iov, int *buftype)
2192 {
2193         struct smb_rqst rqst;
2194         struct smb2_create_rsp *rsp = NULL;
2195         struct TCP_Server_Info *server;
2196         struct cifs_tcon *tcon = oparms->tcon;
2197         struct cifs_ses *ses = tcon->ses;
2198         struct kvec iov[5]; /* make sure at least one for each open context */
2199         struct kvec rsp_iov = {NULL, 0};
2200         int resp_buftype;
2201         int rc = 0;
2202         int flags = 0;
2203
2204         cifs_dbg(FYI, "create/open\n");
2205         if (ses && (ses->server))
2206                 server = ses->server;
2207         else
2208                 return -EIO;
2209
2210         if (smb3_encryption_required(tcon))
2211                 flags |= CIFS_TRANSFORM_REQ;
2212
2213         memset(&rqst, 0, sizeof(struct smb_rqst));
2214         memset(&iov, 0, sizeof(iov));
2215         rqst.rq_iov = iov;
2216         rqst.rq_nvec = 5;
2217
2218         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2219         if (rc)
2220                 goto creat_exit;
2221
2222         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2223                             &rsp_iov);
2224         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2225
2226         if (rc != 0) {
2227                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2228                 if (err_iov && rsp) {
2229                         *err_iov = rsp_iov;
2230                         *buftype = resp_buftype;
2231                         resp_buftype = CIFS_NO_BUFFER;
2232                         rsp = NULL;
2233                 }
2234                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2235                                     oparms->create_options, oparms->desired_access, rc);
2236                 goto creat_exit;
2237         } else
2238                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2239                                      ses->Suid, oparms->create_options,
2240                                      oparms->desired_access);
2241
2242         oparms->fid->persistent_fid = rsp->PersistentFileId;
2243         oparms->fid->volatile_fid = rsp->VolatileFileId;
2244
2245         if (buf) {
2246                 memcpy(buf, &rsp->CreationTime, 32);
2247                 buf->AllocationSize = rsp->AllocationSize;
2248                 buf->EndOfFile = rsp->EndofFile;
2249                 buf->Attributes = rsp->FileAttributes;
2250                 buf->NumberOfLinks = cpu_to_le32(1);
2251                 buf->DeletePending = 0;
2252         }
2253
2254         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2255                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2256                                             oparms->fid->lease_key);
2257         else
2258                 *oplock = rsp->OplockLevel;
2259 creat_exit:
2260         SMB2_open_free(&rqst);
2261         free_rsp_buf(resp_buftype, rsp);
2262         return rc;
2263 }
2264
2265 /*
2266  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2267  */
2268 int
2269 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2270            u64 volatile_fid, u32 opcode, bool is_fsctl,
2271            char *in_data, u32 indatalen,
2272            char **out_data, u32 *plen /* returned data len */)
2273 {
2274         struct smb_rqst rqst;
2275         struct smb2_ioctl_req *req;
2276         struct smb2_ioctl_rsp *rsp;
2277         struct cifs_ses *ses;
2278         struct kvec iov[2];
2279         struct kvec rsp_iov;
2280         int resp_buftype;
2281         int n_iov;
2282         int rc = 0;
2283         int flags = 0;
2284         unsigned int total_len;
2285
2286         cifs_dbg(FYI, "SMB2 IOCTL\n");
2287
2288         if (out_data != NULL)
2289                 *out_data = NULL;
2290
2291         /* zero out returned data len, in case of error */
2292         if (plen)
2293                 *plen = 0;
2294
2295         if (tcon)
2296                 ses = tcon->ses;
2297         else
2298                 return -EIO;
2299
2300         if (!ses || !(ses->server))
2301                 return -EIO;
2302
2303         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2304         if (rc)
2305                 return rc;
2306
2307         if (smb3_encryption_required(tcon))
2308                 flags |= CIFS_TRANSFORM_REQ;
2309
2310         req->CtlCode = cpu_to_le32(opcode);
2311         req->PersistentFileId = persistent_fid;
2312         req->VolatileFileId = volatile_fid;
2313
2314         if (indatalen) {
2315                 req->InputCount = cpu_to_le32(indatalen);
2316                 /* do not set InputOffset if no input data */
2317                 req->InputOffset =
2318                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2319                 iov[1].iov_base = in_data;
2320                 iov[1].iov_len = indatalen;
2321                 n_iov = 2;
2322         } else
2323                 n_iov = 1;
2324
2325         req->OutputOffset = 0;
2326         req->OutputCount = 0; /* MBZ */
2327
2328         /*
2329          * Could increase MaxOutputResponse, but that would require more
2330          * than one credit. Windows typically sets this smaller, but for some
2331          * ioctls it may be useful to allow server to send more. No point
2332          * limiting what the server can send as long as fits in one credit
2333          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2334          * (by default, note that it can be overridden to make max larger)
2335          * in responses (except for read responses which can be bigger.
2336          * We may want to bump this limit up
2337          */
2338         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2339
2340         if (is_fsctl)
2341                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2342         else
2343                 req->Flags = 0;
2344
2345         iov[0].iov_base = (char *)req;
2346
2347         /*
2348          * If no input data, the size of ioctl struct in
2349          * protocol spec still includes a 1 byte data buffer,
2350          * but if input data passed to ioctl, we do not
2351          * want to double count this, so we do not send
2352          * the dummy one byte of data in iovec[0] if sending
2353          * input data (in iovec[1]).
2354          */
2355
2356         if (indatalen) {
2357                 iov[0].iov_len = total_len - 1;
2358         } else
2359                 iov[0].iov_len = total_len;
2360
2361         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2362         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2363                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2364
2365         memset(&rqst, 0, sizeof(struct smb_rqst));
2366         rqst.rq_iov = iov;
2367         rqst.rq_nvec = n_iov;
2368
2369         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2370                             &rsp_iov);
2371         cifs_small_buf_release(req);
2372         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2373
2374         if (rc != 0)
2375                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2376                                 ses->Suid, 0, opcode, rc);
2377
2378         if ((rc != 0) && (rc != -EINVAL)) {
2379                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2380                 goto ioctl_exit;
2381         } else if (rc == -EINVAL) {
2382                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2383                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2384                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2385                         goto ioctl_exit;
2386                 }
2387         }
2388
2389         /* check if caller wants to look at return data or just return rc */
2390         if ((plen == NULL) || (out_data == NULL))
2391                 goto ioctl_exit;
2392
2393         *plen = le32_to_cpu(rsp->OutputCount);
2394
2395         /* We check for obvious errors in the output buffer length and offset */
2396         if (*plen == 0)
2397                 goto ioctl_exit; /* server returned no data */
2398         else if (*plen > 0xFF00) {
2399                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2400                 *plen = 0;
2401                 rc = -EIO;
2402                 goto ioctl_exit;
2403         }
2404
2405         if (rsp_iov.iov_len < le32_to_cpu(rsp->OutputOffset) + *plen) {
2406                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2407                         le32_to_cpu(rsp->OutputOffset));
2408                 *plen = 0;
2409                 rc = -EIO;
2410                 goto ioctl_exit;
2411         }
2412
2413         *out_data = kmalloc(*plen, GFP_KERNEL);
2414         if (*out_data == NULL) {
2415                 rc = -ENOMEM;
2416                 goto ioctl_exit;
2417         }
2418
2419         memcpy(*out_data, (char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen);
2420 ioctl_exit:
2421         free_rsp_buf(resp_buftype, rsp);
2422         return rc;
2423 }
2424
2425 /*
2426  *   Individual callers to ioctl worker function follow
2427  */
2428
2429 int
2430 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2431                      u64 persistent_fid, u64 volatile_fid)
2432 {
2433         int rc;
2434         struct  compress_ioctl fsctl_input;
2435         char *ret_data = NULL;
2436
2437         fsctl_input.CompressionState =
2438                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2439
2440         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2441                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2442                         (char *)&fsctl_input /* data input */,
2443                         2 /* in data len */, &ret_data /* out data */, NULL);
2444
2445         cifs_dbg(FYI, "set compression rc %d\n", rc);
2446
2447         return rc;
2448 }
2449
2450 int
2451 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2452                 u64 persistent_fid, u64 volatile_fid)
2453 {
2454         struct smb2_close_req *req;
2455         struct kvec *iov = rqst->rq_iov;
2456         unsigned int total_len;
2457         int rc;
2458
2459         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2460         if (rc)
2461                 return rc;
2462
2463         req->PersistentFileId = persistent_fid;
2464         req->VolatileFileId = volatile_fid;
2465         iov[0].iov_base = (char *)req;
2466         iov[0].iov_len = total_len;
2467
2468         return 0;
2469 }
2470
2471 void
2472 SMB2_close_free(struct smb_rqst *rqst)
2473 {
2474         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2475 }
2476
2477 int
2478 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2479                  u64 persistent_fid, u64 volatile_fid, int flags)
2480 {
2481         struct smb_rqst rqst;
2482         struct smb2_close_rsp *rsp = NULL;
2483         struct cifs_ses *ses = tcon->ses;
2484         struct kvec iov[1];
2485         struct kvec rsp_iov;
2486         int resp_buftype;
2487         int rc = 0;
2488
2489         cifs_dbg(FYI, "Close\n");
2490
2491         if (!ses || !(ses->server))
2492                 return -EIO;
2493
2494         if (smb3_encryption_required(tcon))
2495                 flags |= CIFS_TRANSFORM_REQ;
2496
2497         memset(&rqst, 0, sizeof(struct smb_rqst));
2498         memset(&iov, 0, sizeof(iov));
2499         rqst.rq_iov = iov;
2500         rqst.rq_nvec = 1;
2501
2502         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2503         if (rc)
2504                 goto close_exit;
2505
2506         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2507         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2508
2509         if (rc != 0) {
2510                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2511                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2512                                      rc);
2513                 goto close_exit;
2514         }
2515
2516         /* BB FIXME - decode close response, update inode for caching */
2517
2518 close_exit:
2519         SMB2_close_free(&rqst);
2520         free_rsp_buf(resp_buftype, rsp);
2521         return rc;
2522 }
2523
2524 int
2525 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2526            u64 persistent_fid, u64 volatile_fid)
2527 {
2528         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2529 }
2530
2531 static int
2532 validate_iov(unsigned int offset, unsigned int buffer_length,
2533              struct kvec *iov, unsigned int min_buf_size)
2534 {
2535         unsigned int smb_len = iov->iov_len;
2536         char *end_of_smb = smb_len + (char *)iov->iov_base;
2537         char *begin_of_buf = offset + (char *)iov->iov_base;
2538         char *end_of_buf = begin_of_buf + buffer_length;
2539
2540
2541         if (buffer_length < min_buf_size) {
2542                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2543                          buffer_length, min_buf_size);
2544                 return -EINVAL;
2545         }
2546
2547         /* check if beyond RFC1001 maximum length */
2548         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2549                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2550                          buffer_length, smb_len);
2551                 return -EINVAL;
2552         }
2553
2554         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2555                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2556                 return -EINVAL;
2557         }
2558
2559         return 0;
2560 }
2561
2562 /*
2563  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2564  * Caller must free buffer.
2565  */
2566 static int
2567 validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2568                       struct kvec *iov, unsigned int minbufsize,
2569                       char *data)
2570 {
2571         char *begin_of_buf = offset + (char *)iov->iov_base;
2572         int rc;
2573
2574         if (!data)
2575                 return -EINVAL;
2576
2577         rc = validate_iov(offset, buffer_length, iov, minbufsize);
2578         if (rc)
2579                 return rc;
2580
2581         memcpy(data, begin_of_buf, buffer_length);
2582
2583         return 0;
2584 }
2585
2586 int
2587 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2588                      u64 persistent_fid, u64 volatile_fid,
2589                      u8 info_class, u8 info_type, u32 additional_info,
2590                      size_t output_len)
2591 {
2592         struct smb2_query_info_req *req;
2593         struct kvec *iov = rqst->rq_iov;
2594         unsigned int total_len;
2595         int rc;
2596
2597         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2598                              &total_len);
2599         if (rc)
2600                 return rc;
2601
2602         req->InfoType = info_type;
2603         req->FileInfoClass = info_class;
2604         req->PersistentFileId = persistent_fid;
2605         req->VolatileFileId = volatile_fid;
2606         req->AdditionalInformation = cpu_to_le32(additional_info);
2607
2608         /*
2609          * We do not use the input buffer (do not send extra byte)
2610          */
2611         req->InputBufferOffset = 0;
2612
2613         req->OutputBufferLength = cpu_to_le32(output_len);
2614
2615         iov[0].iov_base = (char *)req;
2616         /* 1 for Buffer */
2617         iov[0].iov_len = total_len - 1;
2618         return 0;
2619 }
2620
2621 void
2622 SMB2_query_info_free(struct smb_rqst *rqst)
2623 {
2624         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2625 }
2626
2627 static int
2628 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2629            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2630            u32 additional_info, size_t output_len, size_t min_len, void **data,
2631                 u32 *dlen)
2632 {
2633         struct smb_rqst rqst;
2634         struct smb2_query_info_rsp *rsp = NULL;
2635         struct kvec iov[1];
2636         struct kvec rsp_iov;
2637         int rc = 0;
2638         int resp_buftype;
2639         struct cifs_ses *ses = tcon->ses;
2640         int flags = 0;
2641
2642         cifs_dbg(FYI, "Query Info\n");
2643
2644         if (!ses || !(ses->server))
2645                 return -EIO;
2646
2647         if (smb3_encryption_required(tcon))
2648                 flags |= CIFS_TRANSFORM_REQ;
2649
2650         memset(&rqst, 0, sizeof(struct smb_rqst));
2651         memset(&iov, 0, sizeof(iov));
2652         rqst.rq_iov = iov;
2653         rqst.rq_nvec = 1;
2654
2655         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2656                                   info_class, info_type, additional_info,
2657                                   output_len);
2658         if (rc)
2659                 goto qinf_exit;
2660
2661         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2662         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2663
2664         if (rc) {
2665                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2666                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2667                                 ses->Suid, info_class, (__u32)info_type, rc);
2668                 goto qinf_exit;
2669         }
2670
2671         if (dlen) {
2672                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2673                 if (!*data) {
2674                         *data = kmalloc(*dlen, GFP_KERNEL);
2675                         if (!*data) {
2676                                 cifs_dbg(VFS,
2677                                         "Error %d allocating memory for acl\n",
2678                                         rc);
2679                                 *dlen = 0;
2680                                 goto qinf_exit;
2681                         }
2682                 }
2683         }
2684
2685         rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2686                                    le32_to_cpu(rsp->OutputBufferLength),
2687                                    &rsp_iov, min_len, *data);
2688
2689 qinf_exit:
2690         SMB2_query_info_free(&rqst);
2691         free_rsp_buf(resp_buftype, rsp);
2692         return rc;
2693 }
2694
2695 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2696                    u64 persistent_fid, u64 volatile_fid,
2697                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2698 {
2699         return query_info(xid, tcon, persistent_fid, volatile_fid,
2700                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2701                           ea_buf_size,
2702                           sizeof(struct smb2_file_full_ea_info),
2703                           (void **)&data,
2704                           NULL);
2705 }
2706
2707 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2708         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2709 {
2710         return query_info(xid, tcon, persistent_fid, volatile_fid,
2711                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2712                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2713                           sizeof(struct smb2_file_all_info), (void **)&data,
2714                           NULL);
2715 }
2716
2717 int
2718 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2719                 u64 persistent_fid, u64 volatile_fid,
2720                 void **data, u32 *plen)
2721 {
2722         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2723         *plen = 0;
2724
2725         return query_info(xid, tcon, persistent_fid, volatile_fid,
2726                           0, SMB2_O_INFO_SECURITY, additional_info,
2727                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2728 }
2729
2730 int
2731 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2732                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2733 {
2734         return query_info(xid, tcon, persistent_fid, volatile_fid,
2735                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2736                           sizeof(struct smb2_file_internal_info),
2737                           sizeof(struct smb2_file_internal_info),
2738                           (void **)&uniqueid, NULL);
2739 }
2740
2741 /*
2742  * This is a no-op for now. We're not really interested in the reply, but
2743  * rather in the fact that the server sent one and that server->lstrp
2744  * gets updated.
2745  *
2746  * FIXME: maybe we should consider checking that the reply matches request?
2747  */
2748 static void
2749 smb2_echo_callback(struct mid_q_entry *mid)
2750 {
2751         struct TCP_Server_Info *server = mid->callback_data;
2752         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2753         unsigned int credits_received = 1;
2754
2755         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2756                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2757
2758         DeleteMidQEntry(mid);
2759         add_credits(server, credits_received, CIFS_ECHO_OP);
2760 }
2761
2762 void smb2_reconnect_server(struct work_struct *work)
2763 {
2764         struct TCP_Server_Info *server = container_of(work,
2765                                         struct TCP_Server_Info, reconnect.work);
2766         struct cifs_ses *ses;
2767         struct cifs_tcon *tcon, *tcon2;
2768         struct list_head tmp_list;
2769         int tcon_exist = false;
2770         int rc;
2771         int resched = false;
2772
2773
2774         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2775         mutex_lock(&server->reconnect_mutex);
2776
2777         INIT_LIST_HEAD(&tmp_list);
2778         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2779
2780         spin_lock(&cifs_tcp_ses_lock);
2781         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2782                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2783                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2784                                 tcon->tc_count++;
2785                                 list_add_tail(&tcon->rlist, &tmp_list);
2786                                 tcon_exist = true;
2787                         }
2788                 }
2789                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2790                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2791                         tcon_exist = true;
2792                 }
2793         }
2794         /*
2795          * Get the reference to server struct to be sure that the last call of
2796          * cifs_put_tcon() in the loop below won't release the server pointer.
2797          */
2798         if (tcon_exist)
2799                 server->srv_count++;
2800
2801         spin_unlock(&cifs_tcp_ses_lock);
2802
2803         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2804                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2805                 if (!rc)
2806                         cifs_reopen_persistent_handles(tcon);
2807                 else
2808                         resched = true;
2809                 list_del_init(&tcon->rlist);
2810                 cifs_put_tcon(tcon);
2811         }
2812
2813         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2814         if (resched)
2815                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2816         mutex_unlock(&server->reconnect_mutex);
2817
2818         /* now we can safely release srv struct */
2819         if (tcon_exist)
2820                 cifs_put_tcp_session(server, 1);
2821 }
2822
2823 int
2824 SMB2_echo(struct TCP_Server_Info *server)
2825 {
2826         struct smb2_echo_req *req;
2827         int rc = 0;
2828         struct kvec iov[1];
2829         struct smb_rqst rqst = { .rq_iov = iov,
2830                                  .rq_nvec = 1 };
2831         unsigned int total_len;
2832
2833         cifs_dbg(FYI, "In echo request\n");
2834
2835         if (server->tcpStatus == CifsNeedNegotiate) {
2836                 /* No need to send echo on newly established connections */
2837                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2838                 return rc;
2839         }
2840
2841         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2842         if (rc)
2843                 return rc;
2844
2845         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2846
2847         iov[0].iov_len = total_len;
2848         iov[0].iov_base = (char *)req;
2849
2850         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2851                              server, CIFS_ECHO_OP);
2852         if (rc)
2853                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2854
2855         cifs_small_buf_release(req);
2856         return rc;
2857 }
2858
2859 int
2860 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2861            u64 volatile_fid)
2862 {
2863         struct smb_rqst rqst;
2864         struct smb2_flush_req *req;
2865         struct cifs_ses *ses = tcon->ses;
2866         struct kvec iov[1];
2867         struct kvec rsp_iov;
2868         int resp_buftype;
2869         int rc = 0;
2870         int flags = 0;
2871         unsigned int total_len;
2872
2873         cifs_dbg(FYI, "Flush\n");
2874
2875         if (!ses || !(ses->server))
2876                 return -EIO;
2877
2878         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2879         if (rc)
2880                 return rc;
2881
2882         if (smb3_encryption_required(tcon))
2883                 flags |= CIFS_TRANSFORM_REQ;
2884
2885         req->PersistentFileId = persistent_fid;
2886         req->VolatileFileId = volatile_fid;
2887
2888         iov[0].iov_base = (char *)req;
2889         iov[0].iov_len = total_len;
2890
2891         memset(&rqst, 0, sizeof(struct smb_rqst));
2892         rqst.rq_iov = iov;
2893         rqst.rq_nvec = 1;
2894
2895         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2896         cifs_small_buf_release(req);
2897
2898         if (rc != 0) {
2899                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2900                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2901                                      rc);
2902         }
2903
2904         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2905         return rc;
2906 }
2907
2908 /*
2909  * To form a chain of read requests, any read requests after the first should
2910  * have the end_of_chain boolean set to true.
2911  */
2912 static int
2913 smb2_new_read_req(void **buf, unsigned int *total_len,
2914         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2915         unsigned int remaining_bytes, int request_type)
2916 {
2917         int rc = -EACCES;
2918         struct smb2_read_plain_req *req = NULL;
2919         struct smb2_sync_hdr *shdr;
2920         struct TCP_Server_Info *server;
2921
2922         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2923                                  total_len);
2924         if (rc)
2925                 return rc;
2926
2927         server = io_parms->tcon->ses->server;
2928         if (server == NULL)
2929                 return -ECONNABORTED;
2930
2931         shdr = &req->sync_hdr;
2932         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2933
2934         req->PersistentFileId = io_parms->persistent_fid;
2935         req->VolatileFileId = io_parms->volatile_fid;
2936         req->ReadChannelInfoOffset = 0; /* reserved */
2937         req->ReadChannelInfoLength = 0; /* reserved */
2938         req->Channel = 0; /* reserved */
2939         req->MinimumCount = 0;
2940         req->Length = cpu_to_le32(io_parms->length);
2941         req->Offset = cpu_to_le64(io_parms->offset);
2942 #ifdef CONFIG_CIFS_SMB_DIRECT
2943         /*
2944          * If we want to do a RDMA write, fill in and append
2945          * smbd_buffer_descriptor_v1 to the end of read request
2946          */
2947         if (server->rdma && rdata && !server->sign &&
2948                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2949
2950                 struct smbd_buffer_descriptor_v1 *v1;
2951                 bool need_invalidate =
2952                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2953
2954                 rdata->mr = smbd_register_mr(
2955                                 server->smbd_conn, rdata->pages,
2956                                 rdata->nr_pages, rdata->page_offset,
2957                                 rdata->tailsz, true, need_invalidate);
2958                 if (!rdata->mr)
2959                         return -ENOBUFS;
2960
2961                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2962                 if (need_invalidate)
2963                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2964                 req->ReadChannelInfoOffset =
2965                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2966                 req->ReadChannelInfoLength =
2967                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2968                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2969                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2970                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2971                 v1->length = cpu_to_le32(rdata->mr->mr->length);
2972
2973                 *total_len += sizeof(*v1) - 1;
2974         }
2975 #endif
2976         if (request_type & CHAINED_REQUEST) {
2977                 if (!(request_type & END_OF_CHAIN)) {
2978                         /* next 8-byte aligned request */
2979                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2980                         shdr->NextCommand = cpu_to_le32(*total_len);
2981                 } else /* END_OF_CHAIN */
2982                         shdr->NextCommand = 0;
2983                 if (request_type & RELATED_REQUEST) {
2984                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2985                         /*
2986                          * Related requests use info from previous read request
2987                          * in chain.
2988                          */
2989                         shdr->SessionId = 0xFFFFFFFF;
2990                         shdr->TreeId = 0xFFFFFFFF;
2991                         req->PersistentFileId = 0xFFFFFFFF;
2992                         req->VolatileFileId = 0xFFFFFFFF;
2993                 }
2994         }
2995         if (remaining_bytes > io_parms->length)
2996                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2997         else
2998                 req->RemainingBytes = 0;
2999
3000         *buf = req;
3001         return rc;
3002 }
3003
3004 static void
3005 smb2_readv_callback(struct mid_q_entry *mid)
3006 {
3007         struct cifs_readdata *rdata = mid->callback_data;
3008         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3009         struct TCP_Server_Info *server = tcon->ses->server;
3010         struct smb2_sync_hdr *shdr =
3011                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3012         unsigned int credits_received = 1;
3013         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3014                                  .rq_nvec = 2,
3015                                  .rq_pages = rdata->pages,
3016                                  .rq_offset = rdata->page_offset,
3017                                  .rq_npages = rdata->nr_pages,
3018                                  .rq_pagesz = rdata->pagesz,
3019                                  .rq_tailsz = rdata->tailsz };
3020
3021         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3022                  __func__, mid->mid, mid->mid_state, rdata->result,
3023                  rdata->bytes);
3024
3025         switch (mid->mid_state) {
3026         case MID_RESPONSE_RECEIVED:
3027                 credits_received = le16_to_cpu(shdr->CreditRequest);
3028                 /* result already set, check signature */
3029                 if (server->sign && !mid->decrypted) {
3030                         int rc;
3031
3032                         rc = smb2_verify_signature(&rqst, server);
3033                         if (rc)
3034                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3035                                          rc);
3036                 }
3037                 /* FIXME: should this be counted toward the initiating task? */
3038                 task_io_account_read(rdata->got_bytes);
3039                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3040                 break;
3041         case MID_REQUEST_SUBMITTED:
3042         case MID_RETRY_NEEDED:
3043                 rdata->result = -EAGAIN;
3044                 if (server->sign && rdata->got_bytes)
3045                         /* reset bytes number since we can not check a sign */
3046                         rdata->got_bytes = 0;
3047                 /* FIXME: should this be counted toward the initiating task? */
3048                 task_io_account_read(rdata->got_bytes);
3049                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3050                 break;
3051         default:
3052                 if (rdata->result != -ENODATA)
3053                         rdata->result = -EIO;
3054         }
3055 #ifdef CONFIG_CIFS_SMB_DIRECT
3056         /*
3057          * If this rdata has a memmory registered, the MR can be freed
3058          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3059          * because they have limited number and are used for future I/Os
3060          */
3061         if (rdata->mr) {
3062                 smbd_deregister_mr(rdata->mr);
3063                 rdata->mr = NULL;
3064         }
3065 #endif
3066         if (rdata->result)
3067                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3068
3069         queue_work(cifsiod_wq, &rdata->work);
3070         DeleteMidQEntry(mid);
3071         add_credits(server, credits_received, 0);
3072 }
3073
3074 /* smb2_async_readv - send an async read, and set up mid to handle result */
3075 int
3076 smb2_async_readv(struct cifs_readdata *rdata)
3077 {
3078         int rc, flags = 0;
3079         char *buf;
3080         struct smb2_sync_hdr *shdr;
3081         struct cifs_io_parms io_parms;
3082         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3083                                  .rq_nvec = 1 };
3084         struct TCP_Server_Info *server;
3085         unsigned int total_len;
3086
3087         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3088                  __func__, rdata->offset, rdata->bytes);
3089
3090         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3091         io_parms.offset = rdata->offset;
3092         io_parms.length = rdata->bytes;
3093         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3094         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3095         io_parms.pid = rdata->pid;
3096
3097         server = io_parms.tcon->ses->server;
3098
3099         rc = smb2_new_read_req(
3100                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3101         if (rc) {
3102                 if (rc == -EAGAIN && rdata->credits) {
3103                         /* credits was reset by reconnect */
3104                         rdata->credits = 0;
3105                         /* reduce in_flight value since we won't send the req */
3106                         spin_lock(&server->req_lock);
3107                         server->in_flight--;
3108                         spin_unlock(&server->req_lock);
3109                 }
3110                 return rc;
3111         }
3112
3113         if (smb3_encryption_required(io_parms.tcon))
3114                 flags |= CIFS_TRANSFORM_REQ;
3115
3116         rdata->iov[0].iov_base = buf;
3117         rdata->iov[0].iov_len = total_len;
3118
3119         shdr = (struct smb2_sync_hdr *)buf;
3120
3121         if (rdata->credits) {
3122                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3123                                                 SMB2_MAX_BUFFER_SIZE));
3124                 shdr->CreditRequest = shdr->CreditCharge;
3125                 spin_lock(&server->req_lock);
3126                 server->credits += rdata->credits -
3127                                                 le16_to_cpu(shdr->CreditCharge);
3128                 spin_unlock(&server->req_lock);
3129                 wake_up(&server->request_q);
3130                 flags |= CIFS_HAS_CREDITS;
3131         }
3132
3133         kref_get(&rdata->refcount);
3134         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3135                              cifs_readv_receive, smb2_readv_callback,
3136                              smb3_handle_read_data, rdata, flags);
3137         if (rc) {
3138                 kref_put(&rdata->refcount, cifs_readdata_release);
3139                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3140                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3141                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3142                                    io_parms.offset, io_parms.length);
3143         } else
3144                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3145                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3146                                    io_parms.offset, io_parms.length);
3147
3148         cifs_small_buf_release(buf);
3149         return rc;
3150 }
3151
3152 int
3153 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3154           unsigned int *nbytes, char **buf, int *buf_type)
3155 {
3156         struct smb_rqst rqst;
3157         int resp_buftype, rc = -EACCES;
3158         struct smb2_read_plain_req *req = NULL;
3159         struct smb2_read_rsp *rsp = NULL;
3160         struct kvec iov[1];
3161         struct kvec rsp_iov;
3162         unsigned int total_len;
3163         int flags = CIFS_LOG_ERROR;
3164         struct cifs_ses *ses = io_parms->tcon->ses;
3165
3166         *nbytes = 0;
3167         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3168         if (rc)
3169                 return rc;
3170
3171         if (smb3_encryption_required(io_parms->tcon))
3172                 flags |= CIFS_TRANSFORM_REQ;
3173
3174         iov[0].iov_base = (char *)req;
3175         iov[0].iov_len = total_len;
3176
3177         memset(&rqst, 0, sizeof(struct smb_rqst));
3178         rqst.rq_iov = iov;
3179         rqst.rq_nvec = 1;
3180
3181         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3182         cifs_small_buf_release(req);
3183
3184         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3185
3186         if (rc) {
3187                 if (rc != -ENODATA) {
3188                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3189                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3190                 }
3191                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3192                                     io_parms->tcon->tid, ses->Suid,
3193                                     io_parms->offset, io_parms->length);
3194                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3195                 return rc == -ENODATA ? 0 : rc;
3196         } else
3197                 trace_smb3_read_done(xid, req->PersistentFileId,
3198                                     io_parms->tcon->tid, ses->Suid,
3199                                     io_parms->offset, io_parms->length);
3200
3201         *nbytes = le32_to_cpu(rsp->DataLength);
3202         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3203             (*nbytes > io_parms->length)) {
3204                 cifs_dbg(FYI, "bad length %d for count %d\n",
3205                          *nbytes, io_parms->length);
3206                 rc = -EIO;
3207                 *nbytes = 0;
3208         }
3209
3210         if (*buf) {
3211                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3212                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3213         } else if (resp_buftype != CIFS_NO_BUFFER) {
3214                 *buf = rsp_iov.iov_base;
3215                 if (resp_buftype == CIFS_SMALL_BUFFER)
3216                         *buf_type = CIFS_SMALL_BUFFER;
3217                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3218                         *buf_type = CIFS_LARGE_BUFFER;
3219         }
3220         return rc;
3221 }
3222
3223 /*
3224  * Check the mid_state and signature on received buffer (if any), and queue the
3225  * workqueue completion task.
3226  */
3227 static void
3228 smb2_writev_callback(struct mid_q_entry *mid)
3229 {
3230         struct cifs_writedata *wdata = mid->callback_data;
3231         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3232         unsigned int written;
3233         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3234         unsigned int credits_received = 1;
3235
3236         switch (mid->mid_state) {
3237         case MID_RESPONSE_RECEIVED:
3238                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3239                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3240                 if (wdata->result != 0)
3241                         break;
3242
3243                 written = le32_to_cpu(rsp->DataLength);
3244                 /*
3245                  * Mask off high 16 bits when bytes written as returned
3246                  * by the server is greater than bytes requested by the
3247                  * client. OS/2 servers are known to set incorrect
3248                  * CountHigh values.
3249                  */
3250                 if (written > wdata->bytes)
3251                         written &= 0xFFFF;
3252
3253                 if (written < wdata->bytes)
3254                         wdata->result = -ENOSPC;
3255                 else
3256                         wdata->bytes = written;
3257                 break;
3258         case MID_REQUEST_SUBMITTED:
3259         case MID_RETRY_NEEDED:
3260                 wdata->result = -EAGAIN;
3261                 break;
3262         default:
3263                 wdata->result = -EIO;
3264                 break;
3265         }
3266 #ifdef CONFIG_CIFS_SMB_DIRECT
3267         /*
3268          * If this wdata has a memory registered, the MR can be freed
3269          * The number of MRs available is limited, it's important to recover
3270          * used MR as soon as I/O is finished. Hold MR longer in the later
3271          * I/O process can possibly result in I/O deadlock due to lack of MR
3272          * to send request on I/O retry
3273          */
3274         if (wdata->mr) {
3275                 smbd_deregister_mr(wdata->mr);
3276                 wdata->mr = NULL;
3277         }
3278 #endif
3279         if (wdata->result)
3280                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3281
3282         queue_work(cifsiod_wq, &wdata->work);
3283         DeleteMidQEntry(mid);
3284         add_credits(tcon->ses->server, credits_received, 0);
3285 }
3286
3287 /* smb2_async_writev - send an async write, and set up mid to handle result */
3288 int
3289 smb2_async_writev(struct cifs_writedata *wdata,
3290                   void (*release)(struct kref *kref))
3291 {
3292         int rc = -EACCES, flags = 0;
3293         struct smb2_write_req *req = NULL;
3294         struct smb2_sync_hdr *shdr;
3295         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3296         struct TCP_Server_Info *server = tcon->ses->server;
3297         struct kvec iov[1];
3298         struct smb_rqst rqst = { };
3299         unsigned int total_len;
3300
3301         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3302         if (rc) {
3303                 if (rc == -EAGAIN && wdata->credits) {
3304                         /* credits was reset by reconnect */
3305                         wdata->credits = 0;
3306                         /* reduce in_flight value since we won't send the req */
3307                         spin_lock(&server->req_lock);
3308                         server->in_flight--;
3309                         spin_unlock(&server->req_lock);
3310                 }
3311                 goto async_writev_out;
3312         }
3313
3314         if (smb3_encryption_required(tcon))
3315                 flags |= CIFS_TRANSFORM_REQ;
3316
3317         shdr = (struct smb2_sync_hdr *)req;
3318         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3319
3320         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3321         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3322         req->WriteChannelInfoOffset = 0;
3323         req->WriteChannelInfoLength = 0;
3324         req->Channel = 0;
3325         req->Offset = cpu_to_le64(wdata->offset);
3326         req->DataOffset = cpu_to_le16(
3327                                 offsetof(struct smb2_write_req, Buffer));
3328         req->RemainingBytes = 0;
3329 #ifdef CONFIG_CIFS_SMB_DIRECT
3330         /*
3331          * If we want to do a server RDMA read, fill in and append
3332          * smbd_buffer_descriptor_v1 to the end of write request
3333          */
3334         if (server->rdma && !server->sign && wdata->bytes >=
3335                 server->smbd_conn->rdma_readwrite_threshold) {
3336
3337                 struct smbd_buffer_descriptor_v1 *v1;
3338                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3339
3340                 wdata->mr = smbd_register_mr(
3341                                 server->smbd_conn, wdata->pages,
3342                                 wdata->nr_pages, wdata->page_offset,
3343                                 wdata->tailsz, false, need_invalidate);
3344                 if (!wdata->mr) {
3345                         rc = -ENOBUFS;
3346                         goto async_writev_out;
3347                 }
3348                 req->Length = 0;
3349                 req->DataOffset = 0;
3350                 if (wdata->nr_pages > 1)
3351                         req->RemainingBytes =
3352                                 cpu_to_le32(
3353                                         (wdata->nr_pages - 1) * wdata->pagesz -
3354                                         wdata->page_offset + wdata->tailsz
3355                                 );
3356                 else
3357                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3358                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3359                 if (need_invalidate)
3360                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3361                 req->WriteChannelInfoOffset =
3362                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3363                 req->WriteChannelInfoLength =
3364                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3365                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3366                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3367                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3368                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3369         }
3370 #endif
3371         iov[0].iov_len = total_len - 1;
3372         iov[0].iov_base = (char *)req;
3373
3374         rqst.rq_iov = iov;
3375         rqst.rq_nvec = 1;
3376         rqst.rq_pages = wdata->pages;
3377         rqst.rq_offset = wdata->page_offset;
3378         rqst.rq_npages = wdata->nr_pages;
3379         rqst.rq_pagesz = wdata->pagesz;
3380         rqst.rq_tailsz = wdata->tailsz;
3381 #ifdef CONFIG_CIFS_SMB_DIRECT
3382         if (wdata->mr) {
3383                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3384                 rqst.rq_npages = 0;
3385         }
3386 #endif
3387         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3388                  wdata->offset, wdata->bytes);
3389
3390 #ifdef CONFIG_CIFS_SMB_DIRECT
3391         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3392         if (!wdata->mr)
3393                 req->Length = cpu_to_le32(wdata->bytes);
3394 #else
3395         req->Length = cpu_to_le32(wdata->bytes);
3396 #endif
3397
3398         if (wdata->credits) {
3399                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3400                                                     SMB2_MAX_BUFFER_SIZE));
3401                 shdr->CreditRequest = shdr->CreditCharge;
3402                 spin_lock(&server->req_lock);
3403                 server->credits += wdata->credits -
3404                                                 le16_to_cpu(shdr->CreditCharge);
3405                 spin_unlock(&server->req_lock);
3406                 wake_up(&server->request_q);
3407                 flags |= CIFS_HAS_CREDITS;
3408         }
3409
3410         kref_get(&wdata->refcount);
3411         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3412                              wdata, flags);
3413
3414         if (rc) {
3415                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3416                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3417                                      wdata->bytes, rc);
3418                 kref_put(&wdata->refcount, release);
3419                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3420         } else
3421                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3422                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3423                                      wdata->bytes);
3424
3425 async_writev_out:
3426         cifs_small_buf_release(req);
3427         return rc;
3428 }
3429
3430 /*
3431  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3432  * The length field from io_parms must be at least 1 and indicates a number of
3433  * elements with data to write that begins with position 1 in iov array. All
3434  * data length is specified by count.
3435  */
3436 int
3437 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3438            unsigned int *nbytes, struct kvec *iov, int n_vec)
3439 {
3440         struct smb_rqst rqst;
3441         int rc = 0;
3442         struct smb2_write_req *req = NULL;
3443         struct smb2_write_rsp *rsp = NULL;
3444         int resp_buftype;
3445         struct kvec rsp_iov;
3446         int flags = 0;
3447         unsigned int total_len;
3448
3449         *nbytes = 0;
3450
3451         if (n_vec < 1)
3452                 return rc;
3453
3454         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3455                              &total_len);
3456         if (rc)
3457                 return rc;
3458
3459         if (io_parms->tcon->ses->server == NULL)
3460                 return -ECONNABORTED;
3461
3462         if (smb3_encryption_required(io_parms->tcon))
3463                 flags |= CIFS_TRANSFORM_REQ;
3464
3465         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3466
3467         req->PersistentFileId = io_parms->persistent_fid;
3468         req->VolatileFileId = io_parms->volatile_fid;
3469         req->WriteChannelInfoOffset = 0;
3470         req->WriteChannelInfoLength = 0;
3471         req->Channel = 0;
3472         req->Length = cpu_to_le32(io_parms->length);
3473         req->Offset = cpu_to_le64(io_parms->offset);
3474         req->DataOffset = cpu_to_le16(
3475                                 offsetof(struct smb2_write_req, Buffer));
3476         req->RemainingBytes = 0;
3477
3478         iov[0].iov_base = (char *)req;
3479         /* 1 for Buffer */
3480         iov[0].iov_len = total_len - 1;
3481
3482         memset(&rqst, 0, sizeof(struct smb_rqst));
3483         rqst.rq_iov = iov;
3484         rqst.rq_nvec = n_vec + 1;
3485
3486         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3487                             &resp_buftype, flags, &rsp_iov);
3488         cifs_small_buf_release(req);
3489         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3490
3491         if (rc) {
3492                 trace_smb3_write_err(xid, req->PersistentFileId,
3493                                      io_parms->tcon->tid,
3494                                      io_parms->tcon->ses->Suid,
3495                                      io_parms->offset, io_parms->length, rc);
3496                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3497                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3498         } else {
3499                 *nbytes = le32_to_cpu(rsp->DataLength);
3500                 trace_smb3_write_done(xid, req->PersistentFileId,
3501                                      io_parms->tcon->tid,
3502                                      io_parms->tcon->ses->Suid,
3503                                      io_parms->offset, *nbytes);
3504         }
3505
3506         free_rsp_buf(resp_buftype, rsp);
3507         return rc;
3508 }
3509
3510 static unsigned int
3511 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3512 {
3513         int len;
3514         unsigned int entrycount = 0;
3515         unsigned int next_offset = 0;
3516         FILE_DIRECTORY_INFO *entryptr;
3517
3518         if (bufstart == NULL)
3519                 return 0;
3520
3521         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3522
3523         while (1) {
3524                 entryptr = (FILE_DIRECTORY_INFO *)
3525                                         ((char *)entryptr + next_offset);
3526
3527                 if ((char *)entryptr + size > end_of_buf) {
3528                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3529                         break;
3530                 }
3531
3532                 len = le32_to_cpu(entryptr->FileNameLength);
3533                 if ((char *)entryptr + len + size > end_of_buf) {
3534                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3535                                  end_of_buf);
3536                         break;
3537                 }
3538
3539                 *lastentry = (char *)entryptr;
3540                 entrycount++;
3541
3542                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3543                 if (!next_offset)
3544                         break;
3545         }
3546
3547         return entrycount;
3548 }
3549
3550 /*
3551  * Readdir/FindFirst
3552  */
3553 int
3554 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3555                      u64 persistent_fid, u64 volatile_fid, int index,
3556                      struct cifs_search_info *srch_inf)
3557 {
3558         struct smb_rqst rqst;
3559         struct smb2_query_directory_req *req;
3560         struct smb2_query_directory_rsp *rsp = NULL;
3561         struct kvec iov[2];
3562         struct kvec rsp_iov;
3563         int rc = 0;
3564         int len;
3565         int resp_buftype = CIFS_NO_BUFFER;
3566         unsigned char *bufptr;
3567         struct TCP_Server_Info *server;
3568         struct cifs_ses *ses = tcon->ses;
3569         __le16 asteriks = cpu_to_le16('*');
3570         char *end_of_smb;
3571         unsigned int output_size = CIFSMaxBufSize;
3572         size_t info_buf_size;
3573         int flags = 0;
3574         unsigned int total_len;
3575
3576         if (ses && (ses->server))
3577                 server = ses->server;
3578         else
3579                 return -EIO;
3580
3581         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3582                              &total_len);
3583         if (rc)
3584                 return rc;
3585
3586         if (smb3_encryption_required(tcon))
3587                 flags |= CIFS_TRANSFORM_REQ;
3588
3589         switch (srch_inf->info_level) {
3590         case SMB_FIND_FILE_DIRECTORY_INFO:
3591                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3592                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3593                 break;
3594         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3595                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3596                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3597                 break;
3598         default:
3599                 cifs_dbg(VFS, "info level %u isn't supported\n",
3600                          srch_inf->info_level);
3601                 rc = -EINVAL;
3602                 goto qdir_exit;
3603         }
3604
3605         req->FileIndex = cpu_to_le32(index);
3606         req->PersistentFileId = persistent_fid;
3607         req->VolatileFileId = volatile_fid;
3608
3609         len = 0x2;
3610         bufptr = req->Buffer;
3611         memcpy(bufptr, &asteriks, len);
3612
3613         req->FileNameOffset =
3614                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3615         req->FileNameLength = cpu_to_le16(len);
3616         /*
3617          * BB could be 30 bytes or so longer if we used SMB2 specific
3618          * buffer lengths, but this is safe and close enough.
3619          */
3620         output_size = min_t(unsigned int, output_size, server->maxBuf);
3621         output_size = min_t(unsigned int, output_size, 2 << 15);
3622         req->OutputBufferLength = cpu_to_le32(output_size);
3623
3624         iov[0].iov_base = (char *)req;
3625         /* 1 for Buffer */
3626         iov[0].iov_len = total_len - 1;
3627
3628         iov[1].iov_base = (char *)(req->Buffer);
3629         iov[1].iov_len = len;
3630
3631         memset(&rqst, 0, sizeof(struct smb_rqst));
3632         rqst.rq_iov = iov;
3633         rqst.rq_nvec = 2;
3634
3635         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3636         cifs_small_buf_release(req);
3637         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3638
3639         if (rc) {
3640                 if (rc == -ENODATA &&
3641                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3642                         srch_inf->endOfSearch = true;
3643                         rc = 0;
3644                 }
3645                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3646                 goto qdir_exit;
3647         }
3648
3649         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3650                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3651                           info_buf_size);
3652         if (rc)
3653                 goto qdir_exit;
3654
3655         srch_inf->unicode = true;
3656
3657         if (srch_inf->ntwrk_buf_start) {
3658                 if (srch_inf->smallBuf)
3659                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3660                 else
3661                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3662         }
3663         srch_inf->ntwrk_buf_start = (char *)rsp;
3664         srch_inf->srch_entries_start = srch_inf->last_entry =
3665                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3666         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3667         srch_inf->entries_in_buffer =
3668                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3669                                     &srch_inf->last_entry, info_buf_size);
3670         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3671         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3672                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3673                  srch_inf->srch_entries_start, srch_inf->last_entry);
3674         if (resp_buftype == CIFS_LARGE_BUFFER)
3675                 srch_inf->smallBuf = false;
3676         else if (resp_buftype == CIFS_SMALL_BUFFER)
3677                 srch_inf->smallBuf = true;
3678         else
3679                 cifs_dbg(VFS, "illegal search buffer type\n");
3680
3681         return rc;
3682
3683 qdir_exit:
3684         free_rsp_buf(resp_buftype, rsp);
3685         return rc;
3686 }
3687
3688 static int
3689 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3690                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3691                u8 info_type, u32 additional_info, unsigned int num,
3692                 void **data, unsigned int *size)
3693 {
3694         struct smb_rqst rqst;
3695         struct smb2_set_info_req *req;
3696         struct smb2_set_info_rsp *rsp = NULL;
3697         struct kvec *iov;
3698         struct kvec rsp_iov;
3699         int rc = 0;
3700         int resp_buftype;
3701         unsigned int i;
3702         struct cifs_ses *ses = tcon->ses;
3703         int flags = 0;
3704         unsigned int total_len;
3705
3706         if (!ses || !(ses->server))
3707                 return -EIO;
3708
3709         if (!num)
3710                 return -EINVAL;
3711
3712         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3713         if (!iov)
3714                 return -ENOMEM;
3715
3716         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3717         if (rc) {
3718                 kfree(iov);
3719                 return rc;
3720         }
3721
3722         if (smb3_encryption_required(tcon))
3723                 flags |= CIFS_TRANSFORM_REQ;
3724
3725         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3726
3727         req->InfoType = info_type;
3728         req->FileInfoClass = info_class;
3729         req->PersistentFileId = persistent_fid;
3730         req->VolatileFileId = volatile_fid;
3731         req->AdditionalInformation = cpu_to_le32(additional_info);
3732
3733         req->BufferOffset =
3734                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3735         req->BufferLength = cpu_to_le32(*size);
3736
3737         memcpy(req->Buffer, *data, *size);
3738         total_len += *size;
3739
3740         iov[0].iov_base = (char *)req;
3741         /* 1 for Buffer */
3742         iov[0].iov_len = total_len - 1;
3743
3744         for (i = 1; i < num; i++) {
3745                 le32_add_cpu(&req->BufferLength, size[i]);
3746                 iov[i].iov_base = (char *)data[i];
3747                 iov[i].iov_len = size[i];
3748         }
3749
3750         memset(&rqst, 0, sizeof(struct smb_rqst));
3751         rqst.rq_iov = iov;
3752         rqst.rq_nvec = num;
3753
3754         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3755                             &rsp_iov);
3756         cifs_buf_release(req);
3757         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3758
3759         if (rc != 0) {
3760                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3761                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3762                                 ses->Suid, info_class, (__u32)info_type, rc);
3763         }
3764
3765         free_rsp_buf(resp_buftype, rsp);
3766         kfree(iov);
3767         return rc;
3768 }
3769
3770 int
3771 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3772             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3773 {
3774         struct smb2_file_rename_info info;
3775         void **data;
3776         unsigned int size[2];
3777         int rc;
3778         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3779
3780         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3781         if (!data)
3782                 return -ENOMEM;
3783
3784         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3785                               /* 0 = fail if target already exists */
3786         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3787         info.FileNameLength = cpu_to_le32(len);
3788
3789         data[0] = &info;
3790         size[0] = sizeof(struct smb2_file_rename_info);
3791
3792         data[1] = target_file;
3793         size[1] = len + 2 /* null */;
3794
3795         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3796                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3797                 0, 2, data, size);
3798         kfree(data);
3799         return rc;
3800 }
3801
3802 int
3803 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3804                   u64 persistent_fid, u64 volatile_fid)
3805 {
3806         __u8 delete_pending = 1;
3807         void *data;
3808         unsigned int size;
3809
3810         data = &delete_pending;
3811         size = 1; /* sizeof __u8 */
3812
3813         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3814                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3815                 0, 1, &data, &size);
3816 }
3817
3818 int
3819 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3820                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3821 {
3822         struct smb2_file_link_info info;
3823         void **data;
3824         unsigned int size[2];
3825         int rc;
3826         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3827
3828         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3829         if (!data)
3830                 return -ENOMEM;
3831
3832         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3833                               /* 0 = fail if link already exists */
3834         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3835         info.FileNameLength = cpu_to_le32(len);
3836
3837         data[0] = &info;
3838         size[0] = sizeof(struct smb2_file_link_info);
3839
3840         data[1] = target_file;
3841         size[1] = len + 2 /* null */;
3842
3843         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3844                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3845                         0, 2, data, size);
3846         kfree(data);
3847         return rc;
3848 }
3849
3850 int
3851 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3852              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3853 {
3854         struct smb2_file_eof_info info;
3855         void *data;
3856         unsigned int size;
3857
3858         info.EndOfFile = *eof;
3859
3860         data = &info;
3861         size = sizeof(struct smb2_file_eof_info);
3862
3863         if (is_falloc)
3864                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3865                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3866                         0, 1, &data, &size);
3867         else
3868                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3869                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3870                         0, 1, &data, &size);
3871 }
3872
3873 int
3874 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3875               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3876 {
3877         unsigned int size;
3878         size = sizeof(FILE_BASIC_INFO);
3879         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3880                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3881                 0, 1, (void **)&buf, &size);
3882 }
3883
3884 int
3885 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3886                 u64 persistent_fid, u64 volatile_fid,
3887                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3888 {
3889         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3890                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3891                         1, (void **)&pnntsd, &pacllen);
3892 }
3893
3894 int
3895 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3896             u64 persistent_fid, u64 volatile_fid,
3897             struct smb2_file_full_ea_info *buf, int len)
3898 {
3899         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3900                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3901                 0, 1, (void **)&buf, &len);
3902 }
3903
3904 int
3905 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3906                   const u64 persistent_fid, const u64 volatile_fid,
3907                   __u8 oplock_level)
3908 {
3909         struct smb_rqst rqst;
3910         int rc;
3911         struct smb2_oplock_break *req = NULL;
3912         struct cifs_ses *ses = tcon->ses;
3913         int flags = CIFS_OBREAK_OP;
3914         unsigned int total_len;
3915         struct kvec iov[1];
3916         struct kvec rsp_iov;
3917         int resp_buf_type;
3918
3919         cifs_dbg(FYI, "SMB2_oplock_break\n");
3920         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3921                              &total_len);
3922         if (rc)
3923                 return rc;
3924
3925         if (smb3_encryption_required(tcon))
3926                 flags |= CIFS_TRANSFORM_REQ;
3927
3928         req->VolatileFid = volatile_fid;
3929         req->PersistentFid = persistent_fid;
3930         req->OplockLevel = oplock_level;
3931         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3932
3933         flags |= CIFS_NO_RESP;
3934
3935         iov[0].iov_base = (char *)req;
3936         iov[0].iov_len = total_len;
3937
3938         memset(&rqst, 0, sizeof(struct smb_rqst));
3939         rqst.rq_iov = iov;
3940         rqst.rq_nvec = 1;
3941
3942         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
3943         cifs_small_buf_release(req);
3944
3945         if (rc) {
3946                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3947                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3948         }
3949
3950         return rc;
3951 }
3952
3953 static void
3954 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3955                         struct kstatfs *kst)
3956 {
3957         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3958                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3959         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3960         kst->f_bfree  = kst->f_bavail =
3961                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3962         return;
3963 }
3964
3965 static void
3966 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
3967                         struct kstatfs *kst)
3968 {
3969         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
3970         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
3971         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
3972         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
3973                 kst->f_bavail = kst->f_bfree;
3974         else
3975                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
3976         if (response_data->TotalFileNodes != cpu_to_le64(-1))
3977                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
3978         if (response_data->FreeFileNodes != cpu_to_le64(-1))
3979                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
3980
3981         return;
3982 }
3983
3984 static int
3985 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3986                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3987 {
3988         struct TCP_Server_Info *server;
3989         int rc;
3990         struct smb2_query_info_req *req;
3991         unsigned int total_len;
3992
3993         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3994
3995         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3996                 return -EIO;
3997
3998         server = tcon->ses->server;
3999
4000         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4001                              &total_len);
4002         if (rc)
4003                 return rc;
4004
4005         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4006         req->FileInfoClass = level;
4007         req->PersistentFileId = persistent_fid;
4008         req->VolatileFileId = volatile_fid;
4009         /* 1 for pad */
4010         req->InputBufferOffset =
4011                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4012         req->OutputBufferLength = cpu_to_le32(
4013                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4014
4015         iov->iov_base = (char *)req;
4016         iov->iov_len = total_len;
4017         return 0;
4018 }
4019
4020 int
4021 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4022               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4023 {
4024         struct smb_rqst rqst;
4025         struct smb2_query_info_rsp *rsp = NULL;
4026         struct kvec iov;
4027         struct kvec rsp_iov;
4028         int rc = 0;
4029         int resp_buftype;
4030         struct cifs_ses *ses = tcon->ses;
4031         FILE_SYSTEM_POSIX_INFO *info = NULL;
4032         int flags = 0;
4033
4034         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4035                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4036                                 persistent_fid, volatile_fid);
4037         if (rc)
4038                 return rc;
4039
4040         if (smb3_encryption_required(tcon))
4041                 flags |= CIFS_TRANSFORM_REQ;
4042
4043         memset(&rqst, 0, sizeof(struct smb_rqst));
4044         rqst.rq_iov = &iov;
4045         rqst.rq_nvec = 1;
4046
4047         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4048         cifs_small_buf_release(iov.iov_base);
4049         if (rc) {
4050                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4051                 goto posix_qfsinf_exit;
4052         }
4053         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4054
4055         info = (FILE_SYSTEM_POSIX_INFO *)(
4056                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4057         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4058                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4059                           sizeof(FILE_SYSTEM_POSIX_INFO));
4060         if (!rc)
4061                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4062
4063 posix_qfsinf_exit:
4064         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4065         return rc;
4066 }
4067
4068 int
4069 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4070               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4071 {
4072         struct smb_rqst rqst;
4073         struct smb2_query_info_rsp *rsp = NULL;
4074         struct kvec iov;
4075         struct kvec rsp_iov;
4076         int rc = 0;
4077         int resp_buftype;
4078         struct cifs_ses *ses = tcon->ses;
4079         struct smb2_fs_full_size_info *info = NULL;
4080         int flags = 0;
4081
4082         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4083                                 sizeof(struct smb2_fs_full_size_info),
4084                                 persistent_fid, volatile_fid);
4085         if (rc)
4086                 return rc;
4087
4088         if (smb3_encryption_required(tcon))
4089                 flags |= CIFS_TRANSFORM_REQ;
4090
4091         memset(&rqst, 0, sizeof(struct smb_rqst));
4092         rqst.rq_iov = &iov;
4093         rqst.rq_nvec = 1;
4094
4095         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4096         cifs_small_buf_release(iov.iov_base);
4097         if (rc) {
4098                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4099                 goto qfsinf_exit;
4100         }
4101         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4102
4103         info = (struct smb2_fs_full_size_info *)(
4104                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4105         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4106                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4107                           sizeof(struct smb2_fs_full_size_info));
4108         if (!rc)
4109                 copy_fs_info_to_kstatfs(info, fsdata);
4110
4111 qfsinf_exit:
4112         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4113         return rc;
4114 }
4115
4116 int
4117 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4118               u64 persistent_fid, u64 volatile_fid, int level)
4119 {
4120         struct smb_rqst rqst;
4121         struct smb2_query_info_rsp *rsp = NULL;
4122         struct kvec iov;
4123         struct kvec rsp_iov;
4124         int rc = 0;
4125         int resp_buftype, max_len, min_len;
4126         struct cifs_ses *ses = tcon->ses;
4127         unsigned int rsp_len, offset;
4128         int flags = 0;
4129
4130         if (level == FS_DEVICE_INFORMATION) {
4131                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4132                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4133         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4134                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4135                 min_len = MIN_FS_ATTR_INFO_SIZE;
4136         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4137                 max_len = sizeof(struct smb3_fs_ss_info);
4138                 min_len = sizeof(struct smb3_fs_ss_info);
4139         } else if (level == FS_VOLUME_INFORMATION) {
4140                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4141                 min_len = sizeof(struct smb3_fs_vol_info);
4142         } else {
4143                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4144                 return -EINVAL;
4145         }
4146
4147         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4148                                 persistent_fid, volatile_fid);
4149         if (rc)
4150                 return rc;
4151
4152         if (smb3_encryption_required(tcon))
4153                 flags |= CIFS_TRANSFORM_REQ;
4154
4155         memset(&rqst, 0, sizeof(struct smb_rqst));
4156         rqst.rq_iov = &iov;
4157         rqst.rq_nvec = 1;
4158
4159         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4160         cifs_small_buf_release(iov.iov_base);
4161         if (rc) {
4162                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4163                 goto qfsattr_exit;
4164         }
4165         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4166
4167         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4168         offset = le16_to_cpu(rsp->OutputBufferOffset);
4169         rc = validate_iov(offset, rsp_len, &rsp_iov, min_len);
4170         if (rc)
4171                 goto qfsattr_exit;
4172
4173         if (level == FS_ATTRIBUTE_INFORMATION)
4174                 memcpy(&tcon->fsAttrInfo, offset
4175                         + (char *)rsp, min_t(unsigned int,
4176                         rsp_len, max_len));
4177         else if (level == FS_DEVICE_INFORMATION)
4178                 memcpy(&tcon->fsDevInfo, offset
4179                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4180         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4181                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4182                         (offset + (char *)rsp);
4183                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4184                 tcon->perf_sector_size =
4185                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4186         } else if (level == FS_VOLUME_INFORMATION) {
4187                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4188                         (offset + (char *)rsp);
4189                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4190                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4191         }
4192
4193 qfsattr_exit:
4194         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4195         return rc;
4196 }
4197
4198 int
4199 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4200            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4201            const __u32 num_lock, struct smb2_lock_element *buf)
4202 {
4203         struct smb_rqst rqst;
4204         int rc = 0;
4205         struct smb2_lock_req *req = NULL;
4206         struct kvec iov[2];
4207         struct kvec rsp_iov;
4208         int resp_buf_type;
4209         unsigned int count;
4210         int flags = CIFS_NO_RESP;
4211         unsigned int total_len;
4212
4213         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4214
4215         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4216         if (rc)
4217                 return rc;
4218
4219         if (smb3_encryption_required(tcon))
4220                 flags |= CIFS_TRANSFORM_REQ;
4221
4222         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4223         req->LockCount = cpu_to_le16(num_lock);
4224
4225         req->PersistentFileId = persist_fid;
4226         req->VolatileFileId = volatile_fid;
4227
4228         count = num_lock * sizeof(struct smb2_lock_element);
4229
4230         iov[0].iov_base = (char *)req;
4231         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4232         iov[1].iov_base = (char *)buf;
4233         iov[1].iov_len = count;
4234
4235         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4236
4237         memset(&rqst, 0, sizeof(struct smb_rqst));
4238         rqst.rq_iov = iov;
4239         rqst.rq_nvec = 2;
4240
4241         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4242                             &rsp_iov);
4243         cifs_small_buf_release(req);
4244         if (rc) {
4245                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4246                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4247                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4248                                     tcon->ses->Suid, rc);
4249         }
4250
4251         return rc;
4252 }
4253
4254 int
4255 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4256           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4257           const __u64 length, const __u64 offset, const __u32 lock_flags,
4258           const bool wait)
4259 {
4260         struct smb2_lock_element lock;
4261
4262         lock.Offset = cpu_to_le64(offset);
4263         lock.Length = cpu_to_le64(length);
4264         lock.Flags = cpu_to_le32(lock_flags);
4265         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4266                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4267
4268         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4269 }
4270
4271 int
4272 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4273                  __u8 *lease_key, const __le32 lease_state)
4274 {
4275         struct smb_rqst rqst;
4276         int rc;
4277         struct smb2_lease_ack *req = NULL;
4278         struct cifs_ses *ses = tcon->ses;
4279         int flags = CIFS_OBREAK_OP;
4280         unsigned int total_len;
4281         struct kvec iov[1];
4282         struct kvec rsp_iov;
4283         int resp_buf_type;
4284
4285         cifs_dbg(FYI, "SMB2_lease_break\n");
4286         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4287                              &total_len);
4288         if (rc)
4289                 return rc;
4290
4291         if (smb3_encryption_required(tcon))
4292                 flags |= CIFS_TRANSFORM_REQ;
4293
4294         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4295         req->StructureSize = cpu_to_le16(36);
4296         total_len += 12;
4297
4298         memcpy(req->LeaseKey, lease_key, 16);
4299         req->LeaseState = lease_state;
4300
4301         flags |= CIFS_NO_RESP;
4302
4303         iov[0].iov_base = (char *)req;
4304         iov[0].iov_len = total_len;
4305
4306         memset(&rqst, 0, sizeof(struct smb_rqst));
4307         rqst.rq_iov = iov;
4308         rqst.rq_nvec = 1;
4309
4310         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4311         cifs_small_buf_release(req);
4312
4313         if (rc) {
4314                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4315                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4316         }
4317
4318         return rc;
4319 }