fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53
  54 /*
  55  *  The following table defines the expected "StructureSize" of SMB2 requests
  56  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  57  *
  58  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  59  *  indexed by command in host byte order.
  60  */
  61 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  62         /* SMB2_NEGOTIATE */ 36,
  63         /* SMB2_SESSION_SETUP */ 25,
  64         /* SMB2_LOGOFF */ 4,
  65         /* SMB2_TREE_CONNECT */ 9,
  66         /* SMB2_TREE_DISCONNECT */ 4,
  67         /* SMB2_CREATE */ 57,
  68         /* SMB2_CLOSE */ 24,
  69         /* SMB2_FLUSH */ 24,
  70         /* SMB2_READ */ 49,
  71         /* SMB2_WRITE */ 49,
  72         /* SMB2_LOCK */ 48,
  73         /* SMB2_IOCTL */ 57,
  74         /* SMB2_CANCEL */ 4,
  75         /* SMB2_ECHO */ 4,
  76         /* SMB2_QUERY_DIRECTORY */ 33,
  77         /* SMB2_CHANGE_NOTIFY */ 32,
  78         /* SMB2_QUERY_INFO */ 41,
  79         /* SMB2_SET_INFO */ 33,
  80         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  81 };
  82
  83 int smb3_encryption_required(const struct cifs_tcon *tcon)
  84 {
  85         if (!tcon)
  86                 return 0;
  87         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  88             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  89                 return 1;
  90         if (tcon->seal &&
  91             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  92                 return 1;
  93         return 0;
  94 }
  95
  96 static void
  97 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  98                   const struct cifs_tcon *tcon)
  99 {
 100         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 101         shdr->StructureSize = cpu_to_le16(64);
 102         shdr->Command = smb2_cmd;
 103         if (tcon && tcon->ses && tcon->ses->server) {
 104                 struct TCP_Server_Info *server = tcon->ses->server;
 105
 106                 spin_lock(&server->req_lock);
 107                 /* Request up to 2 credits but don't go over the limit. */
 108                 if (server->credits >= server->max_credits)
 109                         shdr->CreditRequest = cpu_to_le16(0);
 110                 else
 111                         shdr->CreditRequest = cpu_to_le16(
 112                                 min_t(int, server->max_credits -
 113                                                 server->credits, 2));
 114                 spin_unlock(&server->req_lock);
 115         } else {
 116                 shdr->CreditRequest = cpu_to_le16(2);
 117         }
 118         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 119
 120         if (!tcon)
 121                 goto out;
 122
 123         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 124         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 125         if ((tcon->ses) && (tcon->ses->server) &&
 126             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 127                 shdr->CreditCharge = cpu_to_le16(1);
 128         /* else CreditCharge MBZ */
 129
 130         shdr->TreeId = tcon->tid;
 131         /* Uid is not converted */
 132         if (tcon->ses)
 133                 shdr->SessionId = tcon->ses->Suid;
 134
 135         /*
 136          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 137          * to pass the path on the Open SMB prefixed by \\server\share.
 138          * Not sure when we would need to do the augmented path (if ever) and
 139          * setting this flag breaks the SMB2 open operation since it is
 140          * illegal to send an empty path name (without \\server\share prefix)
 141          * when the DFS flag is set in the SMB open header. We could
 142          * consider setting the flag on all operations other than open
 143          * but it is safer to net set it for now.
 144          */
 145 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 146                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 147
 148         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 149             !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 157 {
 158         int rc;
 159         struct nls_table *nls_codepage;
 160         struct cifs_ses *ses;
 161         struct TCP_Server_Info *server;
 162
 163         /*
 164          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 165          * check for tcp and smb session status done differently
 166          * for those three - in the calling routine.
 167          */
 168         if (tcon == NULL)
 169                 return 0;
 170
 171         if (smb2_command == SMB2_TREE_CONNECT)
 172                 return 0;
 173
 174         if (tcon->tidStatus == CifsExiting) {
 175                 /*
 176                  * only tree disconnect, open, and write,
 177                  * (and ulogoff which does not have tcon)
 178                  * are allowed as we start force umount.
 179                  */
 180                 if ((smb2_command != SMB2_WRITE) &&
 181                    (smb2_command != SMB2_CREATE) &&
 182                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 183                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 184                                  smb2_command);
 185                         return -ENODEV;
 186                 }
 187         }
 188         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 189             (!tcon->ses->server))
 190                 return -EIO;
 191
 192         ses = tcon->ses;
 193         server = ses->server;
 194
 195         /*
 196          * Give demultiplex thread up to 10 seconds to reconnect, should be
 197          * greater than cifs socket timeout which is 7 seconds
 198          */
 199         while (server->tcpStatus == CifsNeedReconnect) {
 200                 /*
 201                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 202                  * here since they are implicitly done when session drops.
 203                  */
 204                 switch (smb2_command) {
 205                 /*
 206                  * BB Should we keep oplock break and add flush to exceptions?
 207                  */
 208                 case SMB2_TREE_DISCONNECT:
 209                 case SMB2_CANCEL:
 210                 case SMB2_CLOSE:
 211                 case SMB2_OPLOCK_BREAK:
 212                         return -EAGAIN;
 213                 }
 214
 215                 rc = wait_event_interruptible_timeout(server->response_q,
 216                                                       (server->tcpStatus != CifsNeedReconnect),
 217                                                       10 * HZ);
 218                 if (rc < 0) {
 219                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 220                                  " signal by the process\n", __func__);
 221                         return -ERESTARTSYS;
 222                 }
 223
 224                 /* are we still trying to reconnect? */
 225                 if (server->tcpStatus != CifsNeedReconnect)
 226                         break;
 227
 228                 /*
 229                  * on "soft" mounts we wait once. Hard mounts keep
 230                  * retrying until process is killed or server comes
 231                  * back on-line
 232                  */
 233                 if (!tcon->retry) {
 234                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 235                         return -EHOSTDOWN;
 236                 }
 237         }
 238
 239         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 240                 return 0;
 241
 242         nls_codepage = load_nls_default();
 243
 244         /*
 245          * need to prevent multiple threads trying to simultaneously reconnect
 246          * the same SMB session
 247          */
 248         mutex_lock(&tcon->ses->session_mutex);
 249
 250         /*
 251          * Recheck after acquire mutex. If another thread is negotiating
 252          * and the server never sends an answer the socket will be closed
 253          * and tcpStatus set to reconnect.
 254          */
 255         if (server->tcpStatus == CifsNeedReconnect) {
 256                 rc = -EHOSTDOWN;
 257                 mutex_unlock(&tcon->ses->session_mutex);
 258                 goto out;
 259         }
 260
 261         rc = cifs_negotiate_protocol(0, tcon->ses);
 262         if (!rc && tcon->ses->need_reconnect)
 263                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 264
 265         if (rc || !tcon->need_reconnect) {
 266                 mutex_unlock(&tcon->ses->session_mutex);
 267                 goto out;
 268         }
 269
 270         cifs_mark_open_files_invalid(tcon);
 271         if (tcon->use_persistent)
 272                 tcon->need_reopen_files = true;
 273
 274         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 275         mutex_unlock(&tcon->ses->session_mutex);
 276
 277         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 278         if (rc) {
 279                 /* If sess reconnected but tcon didn't, something strange ... */
 280                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 281                 goto out;
 282         }
 283
 284         if (smb2_command != SMB2_INTERNAL_CMD)
 285                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 286
 287         atomic_inc(&tconInfoReconnectCount);
 288 out:
 289         /*
 290          * Check if handle based operation so we know whether we can continue
 291          * or not without returning to caller to reset file handle.
 292          */
 293         /*
 294          * BB Is flush done by server on drop of tcp session? Should we special
 295          * case it and skip above?
 296          */
 297         switch (smb2_command) {
 298         case SMB2_FLUSH:
 299         case SMB2_READ:
 300         case SMB2_WRITE:
 301         case SMB2_LOCK:
 302         case SMB2_IOCTL:
 303         case SMB2_QUERY_DIRECTORY:
 304         case SMB2_CHANGE_NOTIFY:
 305         case SMB2_QUERY_INFO:
 306         case SMB2_SET_INFO:
 307                 rc = -EAGAIN;
 308         }
 309         unload_nls(nls_codepage);
 310         return rc;
 311 }
 312
 313 static void
 314 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 315                unsigned int *total_len)
 316 {
 317         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 318         /* lookup word count ie StructureSize from table */
 319         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 320
 321         /*
 322          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 323          * largest operations (Create)
 324          */
 325         memset(buf, 0, 256);
 326
 327         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 328         spdu->StructureSize2 = cpu_to_le16(parmsize);
 329
 330         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 331 }
 332
 333 /*
 334  * Allocate and return pointer to an SMB request hdr, and set basic
 335  * SMB information in the SMB header. If the return code is zero, this
 336  * function must have filled in request_buf pointer.
 337  */
 338 static int
 339 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 340                     void **request_buf, unsigned int *total_len)
 341 {
 342         int rc;
 343
 344         rc = smb2_reconnect(smb2_command, tcon);
 345         if (rc)
 346                 return rc;
 347
 348         /* BB eventually switch this to SMB2 specific small buf size */
 349         if (smb2_command == SMB2_SET_INFO)
 350                 *request_buf = cifs_buf_get();
 351         else
 352                 *request_buf = cifs_small_buf_get();
 353         if (*request_buf == NULL) {
 354                 /* BB should we add a retry in here if not a writepage? */
 355                 return -ENOMEM;
 356         }
 357
 358         fill_small_buf(smb2_command, tcon,
 359                        (struct smb2_sync_hdr *)(*request_buf),
 360                        total_len);
 361
 362         if (tcon != NULL) {
 363                 uint16_t com_code = le16_to_cpu(smb2_command);
 364                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 365                 cifs_stats_inc(&tcon->num_smbs_sent);
 366         }
 367
 368         return rc;
 369 }
 370
 371
 372 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 373 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 374
 375
 376 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 377 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 378 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 379
 380 static void
 381 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 382 {
 383         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 384         pneg_ctxt->DataLength = cpu_to_le16(38);
 385         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 386         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 387         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 388         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 389 }
 390
 391 static void
 392 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 393 {
 394         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 395         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 396         pneg_ctxt->CipherCount = cpu_to_le16(1);
 397 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 398         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 399 }
 400
 401 static void
 402 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 403 {
 404         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 405         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 406 }
 407
 408 static void
 409 assemble_neg_contexts(struct smb2_negotiate_req *req,
 410                       unsigned int *total_len)
 411 {
 412         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 413         unsigned int ctxt_len;
 414
 415         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 416         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 417         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 418         *total_len += ctxt_len;
 419         pneg_ctxt += ctxt_len;
 420
 421         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 422         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 423         *total_len += ctxt_len;
 424         pneg_ctxt += ctxt_len;
 425
 426         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 427         *total_len += sizeof(struct smb2_posix_neg_context);
 428
 429         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 430         req->NegotiateContextCount = cpu_to_le16(3);
 431 }
 432
 433 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 434 {
 435         unsigned int len = le16_to_cpu(ctxt->DataLength);
 436
 437         /* If invalid preauth context warn but use what we requested, SHA-512 */
 438         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 439                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 440                 return;
 441         }
 442         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 443                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 444         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 445                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 446 }
 447
 448 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 449                               struct smb2_encryption_neg_context *ctxt)
 450 {
 451         unsigned int len = le16_to_cpu(ctxt->DataLength);
 452
 453         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 454         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 455                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 456                 return -EINVAL;
 457         }
 458
 459         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 460                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 461                 return -EINVAL;
 462         }
 463         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 464         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 465             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 466                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 467                 return -EINVAL;
 468         }
 469         server->cipher_type = ctxt->Ciphers[0];
 470         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 471         return 0;
 472 }
 473
 474 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 475                                      struct TCP_Server_Info *server,
 476                                      unsigned int len_of_smb)
 477 {
 478         struct smb2_neg_context *pctx;
 479         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 480         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 481         unsigned int len_of_ctxts, i;
 482         int rc = 0;
 483
 484         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 485         if (len_of_smb <= offset) {
 486                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 487                 return -EINVAL;
 488         }
 489
 490         len_of_ctxts = len_of_smb - offset;
 491
 492         for (i = 0; i < ctxt_cnt; i++) {
 493                 int clen;
 494                 /* check that offset is not beyond end of SMB */
 495                 if (len_of_ctxts == 0)
 496                         break;
 497
 498                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 499                         break;
 500
 501                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 502                 clen = le16_to_cpu(pctx->DataLength);
 503                 if (clen > len_of_ctxts)
 504                         break;
 505
 506                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 507                         decode_preauth_context(
 508                                 (struct smb2_preauth_neg_context *)pctx);
 509                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 510                         rc = decode_encrypt_ctx(server,
 511                                 (struct smb2_encryption_neg_context *)pctx);
 512                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 513                         server->posix_ext_supported = true;
 514                 else
 515                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 516                                 le16_to_cpu(pctx->ContextType));
 517
 518                 if (rc)
 519                         break;
 520                 /* offsets must be 8 byte aligned */
 521                 clen = (clen + 7) & ~0x7;
 522                 offset += clen + sizeof(struct smb2_neg_context);
 523                 len_of_ctxts -= clen;
 524         }
 525         return rc;
 526 }
 527
 528 static struct create_posix *
 529 create_posix_buf(umode_t mode)
 530 {
 531         struct create_posix *buf;
 532
 533         buf = kzalloc(sizeof(struct create_posix),
 534                         GFP_KERNEL);
 535         if (!buf)
 536                 return NULL;
 537
 538         buf->ccontext.DataOffset =
 539                 cpu_to_le16(offsetof(struct create_posix, Mode));
 540         buf->ccontext.DataLength = cpu_to_le32(4);
 541         buf->ccontext.NameOffset =
 542                 cpu_to_le16(offsetof(struct create_posix, Name));
 543         buf->ccontext.NameLength = cpu_to_le16(16);
 544
 545         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 546         buf->Name[0] = 0x93;
 547         buf->Name[1] = 0xAD;
 548         buf->Name[2] = 0x25;
 549         buf->Name[3] = 0x50;
 550         buf->Name[4] = 0x9C;
 551         buf->Name[5] = 0xB4;
 552         buf->Name[6] = 0x11;
 553         buf->Name[7] = 0xE7;
 554         buf->Name[8] = 0xB4;
 555         buf->Name[9] = 0x23;
 556         buf->Name[10] = 0x83;
 557         buf->Name[11] = 0xDE;
 558         buf->Name[12] = 0x96;
 559         buf->Name[13] = 0x8B;
 560         buf->Name[14] = 0xCD;
 561         buf->Name[15] = 0x7C;
 562         buf->Mode = cpu_to_le32(mode);
 563         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 564         return buf;
 565 }
 566
 567 static int
 568 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 569 {
 570         struct smb2_create_req *req = iov[0].iov_base;
 571         unsigned int num = *num_iovec;
 572
 573         iov[num].iov_base = create_posix_buf(mode);
 574         if (iov[num].iov_base == NULL)
 575                 return -ENOMEM;
 576         iov[num].iov_len = sizeof(struct create_posix);
 577         if (!req->CreateContextsOffset)
 578                 req->CreateContextsOffset = cpu_to_le32(
 579                                 sizeof(struct smb2_create_req) +
 580                                 iov[num - 1].iov_len);
 581         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 582         *num_iovec = num + 1;
 583         return 0;
 584 }
 585
 586
 587 /*
 588  *
 589  *      SMB2 Worker functions follow:
 590  *
 591  *      The general structure of the worker functions is:
 592  *      1) Call smb2_init (assembles SMB2 header)
 593  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 594  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 595  *      4) Decode SMB2 command specific fields in the fixed length area
 596  *      5) Decode variable length data area (if any for this SMB2 command type)
 597  *      6) Call free smb buffer
 598  *      7) return
 599  *
 600  */
 601
 602 int
 603 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 604 {
 605         struct smb_rqst rqst;
 606         struct smb2_negotiate_req *req;
 607         struct smb2_negotiate_rsp *rsp;
 608         struct kvec iov[1];
 609         struct kvec rsp_iov;
 610         int rc = 0;
 611         int resp_buftype;
 612         struct TCP_Server_Info *server = ses->server;
 613         int blob_offset, blob_length;
 614         char *security_blob;
 615         int flags = CIFS_NEG_OP;
 616         unsigned int total_len;
 617
 618         cifs_dbg(FYI, "Negotiate protocol\n");
 619
 620         if (!server) {
 621                 WARN(1, "%s: server is NULL!\n", __func__);
 622                 return -EIO;
 623         }
 624
 625         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 626         if (rc)
 627                 return rc;
 628
 629         req->sync_hdr.SessionId = 0;
 630
 631         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 632         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 633
 634         if (strcmp(ses->server->vals->version_string,
 635                    SMB3ANY_VERSION_STRING) == 0) {
 636                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 637                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 638                 req->DialectCount = cpu_to_le16(2);
 639                 total_len += 4;
 640         } else if (strcmp(ses->server->vals->version_string,
 641                    SMBDEFAULT_VERSION_STRING) == 0) {
 642                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 643                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 644                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 645                 req->DialectCount = cpu_to_le16(3);
 646                 total_len += 6;
 647         } else {
 648                 /* otherwise send specific dialect */
 649                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 650                 req->DialectCount = cpu_to_le16(1);
 651                 total_len += 2;
 652         }
 653
 654         /* only one of SMB2 signing flags may be set in SMB2 request */
 655         if (ses->sign)
 656                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 657         else if (global_secflags & CIFSSEC_MAY_SIGN)
 658                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 659         else
 660                 req->SecurityMode = 0;
 661
 662         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 663
 664         /* ClientGUID must be zero for SMB2.02 dialect */
 665         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 666                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 667         else {
 668                 memcpy(req->ClientGUID, server->client_guid,
 669                         SMB2_CLIENT_GUID_SIZE);
 670                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 671                         assemble_neg_contexts(req, &total_len);
 672         }
 673         iov[0].iov_base = (char *)req;
 674         iov[0].iov_len = total_len;
 675
 676         memset(&rqst, 0, sizeof(struct smb_rqst));
 677         rqst.rq_iov = iov;
 678         rqst.rq_nvec = 1;
 679
 680         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 681         cifs_small_buf_release(req);
 682         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 683         /*
 684          * No tcon so can't do
 685          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 686          */
 687         if (rc == -EOPNOTSUPP) {
 688                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 689                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 690                         " older servers\n");
 691                 goto neg_exit;
 692         } else if (rc != 0)
 693                 goto neg_exit;
 694
 695         if (strcmp(ses->server->vals->version_string,
 696                    SMB3ANY_VERSION_STRING) == 0) {
 697                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 698                         cifs_dbg(VFS,
 699                                 "SMB2 dialect returned but not requested\n");
 700                         return -EIO;
 701                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 702                         cifs_dbg(VFS,
 703                                 "SMB2.1 dialect returned but not requested\n");
 704                         return -EIO;
 705                 }
 706         } else if (strcmp(ses->server->vals->version_string,
 707                    SMBDEFAULT_VERSION_STRING) == 0) {
 708                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 709                         cifs_dbg(VFS,
 710                                 "SMB2 dialect returned but not requested\n");
 711                         return -EIO;
 712                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 713                         /* ops set to 3.0 by default for default so update */
 714                         ses->server->ops = &smb21_operations;
 715                 }
 716         } else if (le16_to_cpu(rsp->DialectRevision) !=
 717                                 ses->server->vals->protocol_id) {
 718                 /* if requested single dialect ensure returned dialect matched */
 719                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 720                         le16_to_cpu(rsp->DialectRevision));
 721                 return -EIO;
 722         }
 723
 724         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 725
 726         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 727                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 728         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 729                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 730         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 731                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 732         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 733                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 734         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 735                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 736         else {
 737                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 738                          le16_to_cpu(rsp->DialectRevision));
 739                 rc = -EIO;
 740                 goto neg_exit;
 741         }
 742         server->dialect = le16_to_cpu(rsp->DialectRevision);
 743
 744         /*
 745          * Keep a copy of the hash after negprot. This hash will be
 746          * the starting hash value for all sessions made from this
 747          * server.
 748          */
 749         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 750                SMB2_PREAUTH_HASH_SIZE);
 751
 752         /* SMB2 only has an extended negflavor */
 753         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 754         /* set it to the maximum buffer size value we can send with 1 credit */
 755         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 756                                SMB2_MAX_BUFFER_SIZE);
 757         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 758         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 759         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 760         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 761                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 762                                 server->sec_mode);
 763         server->capabilities = le32_to_cpu(rsp->Capabilities);
 764         /* Internal types */
 765         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 766
 767         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 768                                                (struct smb2_sync_hdr *)rsp);
 769         /*
 770          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 771          * for us will be
 772          *      ses->sectype = RawNTLMSSP;
 773          * but for time being this is our only auth choice so doesn't matter.
 774          * We just found a server which sets blob length to zero expecting raw.
 775          */
 776         if (blob_length == 0) {
 777                 cifs_dbg(FYI, "missing security blob on negprot\n");
 778                 server->sec_ntlmssp = true;
 779         }
 780
 781         rc = cifs_enable_signing(server, ses->sign);
 782         if (rc)
 783                 goto neg_exit;
 784         if (blob_length) {
 785                 rc = decode_negTokenInit(security_blob, blob_length, server);
 786                 if (rc == 1)
 787                         rc = 0;
 788                 else if (rc == 0)
 789                         rc = -EIO;
 790         }
 791
 792         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 793                 if (rsp->NegotiateContextCount)
 794                         rc = smb311_decode_neg_context(rsp, server,
 795                                                        rsp_iov.iov_len);
 796                 else
 797                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 798         }
 799 neg_exit:
 800         free_rsp_buf(resp_buftype, rsp);
 801         return rc;
 802 }
 803
 804 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 805 {
 806         int rc;
 807         struct validate_negotiate_info_req *pneg_inbuf;
 808         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 809         u32 rsplen;
 810         u32 inbuflen; /* max of 4 dialects */
 811
 812         cifs_dbg(FYI, "validate negotiate\n");
 813
 814         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 815         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 816                 return 0;
 817
 818         /*
 819          * validation ioctl must be signed, so no point sending this if we
 820          * can not sign it (ie are not known user).  Even if signing is not
 821          * required (enabled but not negotiated), in those cases we selectively
 822          * sign just this, the first and only signed request on a connection.
 823          * Having validation of negotiate info  helps reduce attack vectors.
 824          */
 825         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 826                 return 0; /* validation requires signing */
 827
 828         if (tcon->ses->user_name == NULL) {
 829                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 830                 return 0; /* validation requires signing */
 831         }
 832
 833         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 834                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 835
 836         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 837         if (!pneg_inbuf)
 838                 return -ENOMEM;
 839
 840         pneg_inbuf->Capabilities =
 841                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 842         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 843                                         SMB2_CLIENT_GUID_SIZE);
 844
 845         if (tcon->ses->sign)
 846                 pneg_inbuf->SecurityMode =
 847                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 848         else if (global_secflags & CIFSSEC_MAY_SIGN)
 849                 pneg_inbuf->SecurityMode =
 850                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 851         else
 852                 pneg_inbuf->SecurityMode = 0;
 853
 854
 855         if (strcmp(tcon->ses->server->vals->version_string,
 856                 SMB3ANY_VERSION_STRING) == 0) {
 857                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 858                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 859                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 860                 /* structure is big enough for 3 dialects, sending only 2 */
 861                 inbuflen = sizeof(*pneg_inbuf) -
 862                                 sizeof(pneg_inbuf->Dialects[0]);
 863         } else if (strcmp(tcon->ses->server->vals->version_string,
 864                 SMBDEFAULT_VERSION_STRING) == 0) {
 865                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 866                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 867                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 868                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 869                 /* structure is big enough for 3 dialects */
 870                 inbuflen = sizeof(*pneg_inbuf);
 871         } else {
 872                 /* otherwise specific dialect was requested */
 873                 pneg_inbuf->Dialects[0] =
 874                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 875                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 876                 /* structure is big enough for 3 dialects, sending only 1 */
 877                 inbuflen = sizeof(*pneg_inbuf) -
 878                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 879         }
 880
 881         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 882                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 883                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 884
 885         if (rc != 0) {
 886                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 887                 rc = -EIO;
 888                 goto out_free_inbuf;
 889         }
 890
 891         rc = -EIO;
 892         if (rsplen != sizeof(*pneg_rsp)) {
 893                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 894                          rsplen);
 895
 896                 /* relax check since Mac returns max bufsize allowed on ioctl */
 897                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 898                         goto out_free_rsp;
 899         }
 900
 901         /* check validate negotiate info response matches what we got earlier */
 902         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 903                 goto vneg_out;
 904
 905         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 906                 goto vneg_out;
 907
 908         /* do not validate server guid because not saved at negprot time yet */
 909
 910         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 911               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 912                 goto vneg_out;
 913
 914         /* validate negotiate successful */
 915         rc = 0;
 916         cifs_dbg(FYI, "validate negotiate info successful\n");
 917         goto out_free_rsp;
 918
 919 vneg_out:
 920         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 921 out_free_rsp:
 922         kfree(pneg_rsp);
 923 out_free_inbuf:
 924         kfree(pneg_inbuf);
 925         return rc;
 926 }
 927
 928 enum securityEnum
 929 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 930 {
 931         switch (requested) {
 932         case Kerberos:
 933         case RawNTLMSSP:
 934                 return requested;
 935         case NTLMv2:
 936                 return RawNTLMSSP;
 937         case Unspecified:
 938                 if (server->sec_ntlmssp &&
 939                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 940                         return RawNTLMSSP;
 941                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 942                         (global_secflags & CIFSSEC_MAY_KRB5))
 943                         return Kerberos;
 944                 /* Fallthrough */
 945         default:
 946                 return Unspecified;
 947         }
 948 }
 949
 950 struct SMB2_sess_data {
 951         unsigned int xid;
 952         struct cifs_ses *ses;
 953         struct nls_table *nls_cp;
 954         void (*func)(struct SMB2_sess_data *);
 955         int result;
 956         u64 previous_session;
 957
 958         /* we will send the SMB in three pieces:
 959          * a fixed length beginning part, an optional
 960          * SPNEGO blob (which can be zero length), and a
 961          * last part which will include the strings
 962          * and rest of bcc area. This allows us to avoid
 963          * a large buffer 17K allocation
 964          */
 965         int buf0_type;
 966         struct kvec iov[2];
 967 };
 968
 969 static int
 970 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 971 {
 972         int rc;
 973         struct cifs_ses *ses = sess_data->ses;
 974         struct smb2_sess_setup_req *req;
 975         struct TCP_Server_Info *server = ses->server;
 976         unsigned int total_len;
 977
 978         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 979                              &total_len);
 980         if (rc)
 981                 return rc;
 982
 983         /* First session, not a reauthenticate */
 984         req->sync_hdr.SessionId = 0;
 985
 986         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 987         req->PreviousSessionId = sess_data->previous_session;
 988
 989         req->Flags = 0; /* MBZ */
 990
 991         /* enough to enable echos and oplocks and one max size write */
 992         req->sync_hdr.CreditRequest = cpu_to_le16(130);
 993
 994         /* only one of SMB2 signing flags may be set in SMB2 request */
 995         if (server->sign)
 996                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 997         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 998                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 999         else
1000                 req->SecurityMode = 0;
1001
1002         req->Capabilities = 0;
1003         req->Channel = 0; /* MBZ */
1004
1005         sess_data->iov[0].iov_base = (char *)req;
1006         /* 1 for pad */
1007         sess_data->iov[0].iov_len = total_len - 1;
1008         /*
1009          * This variable will be used to clear the buffer
1010          * allocated above in case of any error in the calling function.
1011          */
1012         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1013
1014         return 0;
1015 }
1016
1017 static void
1018 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1019 {
1020         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1021         sess_data->buf0_type = CIFS_NO_BUFFER;
1022 }
1023
1024 static int
1025 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1026 {
1027         int rc;
1028         struct smb_rqst rqst;
1029         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1030         struct kvec rsp_iov = { NULL, 0 };
1031
1032         /* Testing shows that buffer offset must be at location of Buffer[0] */
1033         req->SecurityBufferOffset =
1034                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1035         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1036
1037         memset(&rqst, 0, sizeof(struct smb_rqst));
1038         rqst.rq_iov = sess_data->iov;
1039         rqst.rq_nvec = 2;
1040
1041         /* BB add code to build os and lm fields */
1042         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1043                             &rqst,
1044                             &sess_data->buf0_type,
1045                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1046         cifs_small_buf_release(sess_data->iov[0].iov_base);
1047         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1048
1049         return rc;
1050 }
1051
1052 static int
1053 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1054 {
1055         int rc = 0;
1056         struct cifs_ses *ses = sess_data->ses;
1057
1058         mutex_lock(&ses->server->srv_mutex);
1059         if (ses->server->ops->generate_signingkey) {
1060                 rc = ses->server->ops->generate_signingkey(ses);
1061                 if (rc) {
1062                         cifs_dbg(FYI,
1063                                 "SMB3 session key generation failed\n");
1064                         mutex_unlock(&ses->server->srv_mutex);
1065                         return rc;
1066                 }
1067         }
1068         if (!ses->server->session_estab) {
1069                 ses->server->sequence_number = 0x2;
1070                 ses->server->session_estab = true;
1071         }
1072         mutex_unlock(&ses->server->srv_mutex);
1073
1074         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1075         spin_lock(&GlobalMid_Lock);
1076         ses->status = CifsGood;
1077         ses->need_reconnect = false;
1078         spin_unlock(&GlobalMid_Lock);
1079         return rc;
1080 }
1081
1082 #ifdef CONFIG_CIFS_UPCALL
1083 static void
1084 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1085 {
1086         int rc;
1087         struct cifs_ses *ses = sess_data->ses;
1088         struct cifs_spnego_msg *msg;
1089         struct key *spnego_key = NULL;
1090         struct smb2_sess_setup_rsp *rsp = NULL;
1091
1092         rc = SMB2_sess_alloc_buffer(sess_data);
1093         if (rc)
1094                 goto out;
1095
1096         spnego_key = cifs_get_spnego_key(ses);
1097         if (IS_ERR(spnego_key)) {
1098                 rc = PTR_ERR(spnego_key);
1099                 spnego_key = NULL;
1100                 goto out;
1101         }
1102
1103         msg = spnego_key->payload.data[0];
1104         /*
1105          * check version field to make sure that cifs.upcall is
1106          * sending us a response in an expected form
1107          */
1108         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1109                 cifs_dbg(VFS,
1110                           "bad cifs.upcall version. Expected %d got %d",
1111                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1112                 rc = -EKEYREJECTED;
1113                 goto out_put_spnego_key;
1114         }
1115
1116         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1117                                          GFP_KERNEL);
1118         if (!ses->auth_key.response) {
1119                 cifs_dbg(VFS,
1120                         "Kerberos can't allocate (%u bytes) memory",
1121                         msg->sesskey_len);
1122                 rc = -ENOMEM;
1123                 goto out_put_spnego_key;
1124         }
1125         ses->auth_key.len = msg->sesskey_len;
1126
1127         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1128         sess_data->iov[1].iov_len = msg->secblob_len;
1129
1130         rc = SMB2_sess_sendreceive(sess_data);
1131         if (rc)
1132                 goto out_put_spnego_key;
1133
1134         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1135         ses->Suid = rsp->sync_hdr.SessionId;
1136
1137         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1138
1139         rc = SMB2_sess_establish_session(sess_data);
1140 out_put_spnego_key:
1141         key_invalidate(spnego_key);
1142         key_put(spnego_key);
1143 out:
1144         sess_data->result = rc;
1145         sess_data->func = NULL;
1146         SMB2_sess_free_buffer(sess_data);
1147 }
1148 #else
1149 static void
1150 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1151 {
1152         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1153         sess_data->result = -EOPNOTSUPP;
1154         sess_data->func = NULL;
1155 }
1156 #endif
1157
1158 static void
1159 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1160
1161 static void
1162 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1163 {
1164         int rc;
1165         struct cifs_ses *ses = sess_data->ses;
1166         struct smb2_sess_setup_rsp *rsp = NULL;
1167         char *ntlmssp_blob = NULL;
1168         bool use_spnego = false; /* else use raw ntlmssp */
1169         u16 blob_length = 0;
1170
1171         /*
1172          * If memory allocation is successful, caller of this function
1173          * frees it.
1174          */
1175         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1176         if (!ses->ntlmssp) {
1177                 rc = -ENOMEM;
1178                 goto out_err;
1179         }
1180         ses->ntlmssp->sesskey_per_smbsess = true;
1181
1182         rc = SMB2_sess_alloc_buffer(sess_data);
1183         if (rc)
1184                 goto out_err;
1185
1186         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1187                                GFP_KERNEL);
1188         if (ntlmssp_blob == NULL) {
1189                 rc = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1194         if (use_spnego) {
1195                 /* BB eventually need to add this */
1196                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1197                 rc = -EOPNOTSUPP;
1198                 goto out;
1199         } else {
1200                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1201                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1202         }
1203         sess_data->iov[1].iov_base = ntlmssp_blob;
1204         sess_data->iov[1].iov_len = blob_length;
1205
1206         rc = SMB2_sess_sendreceive(sess_data);
1207         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1208
1209         /* If true, rc here is expected and not an error */
1210         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1211                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1212                 rc = 0;
1213
1214         if (rc)
1215                 goto out;
1216
1217         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1218                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1219                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1220                         le16_to_cpu(rsp->SecurityBufferOffset));
1221                 rc = -EIO;
1222                 goto out;
1223         }
1224         rc = decode_ntlmssp_challenge(rsp->Buffer,
1225                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1226         if (rc)
1227                 goto out;
1228
1229         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1230
1231
1232         ses->Suid = rsp->sync_hdr.SessionId;
1233         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234
1235 out:
1236         kfree(ntlmssp_blob);
1237         SMB2_sess_free_buffer(sess_data);
1238         if (!rc) {
1239                 sess_data->result = 0;
1240                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1241                 return;
1242         }
1243 out_err:
1244         kfree(ses->ntlmssp);
1245         ses->ntlmssp = NULL;
1246         sess_data->result = rc;
1247         sess_data->func = NULL;
1248 }
1249
1250 static void
1251 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1252 {
1253         int rc;
1254         struct cifs_ses *ses = sess_data->ses;
1255         struct smb2_sess_setup_req *req;
1256         struct smb2_sess_setup_rsp *rsp = NULL;
1257         unsigned char *ntlmssp_blob = NULL;
1258         bool use_spnego = false; /* else use raw ntlmssp */
1259         u16 blob_length = 0;
1260
1261         rc = SMB2_sess_alloc_buffer(sess_data);
1262         if (rc)
1263                 goto out;
1264
1265         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1266         req->sync_hdr.SessionId = ses->Suid;
1267
1268         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1269                                         sess_data->nls_cp);
1270         if (rc) {
1271                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1272                 goto out;
1273         }
1274
1275         if (use_spnego) {
1276                 /* BB eventually need to add this */
1277                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1278                 rc = -EOPNOTSUPP;
1279                 goto out;
1280         }
1281         sess_data->iov[1].iov_base = ntlmssp_blob;
1282         sess_data->iov[1].iov_len = blob_length;
1283
1284         rc = SMB2_sess_sendreceive(sess_data);
1285         if (rc)
1286                 goto out;
1287
1288         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1289
1290         ses->Suid = rsp->sync_hdr.SessionId;
1291         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1292
1293         rc = SMB2_sess_establish_session(sess_data);
1294 out:
1295         kfree(ntlmssp_blob);
1296         SMB2_sess_free_buffer(sess_data);
1297         kfree(ses->ntlmssp);
1298         ses->ntlmssp = NULL;
1299         sess_data->result = rc;
1300         sess_data->func = NULL;
1301 }
1302
1303 static int
1304 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1305 {
1306         int type;
1307
1308         type = smb2_select_sectype(ses->server, ses->sectype);
1309         cifs_dbg(FYI, "sess setup type %d\n", type);
1310         if (type == Unspecified) {
1311                 cifs_dbg(VFS,
1312                         "Unable to select appropriate authentication method!");
1313                 return -EINVAL;
1314         }
1315
1316         switch (type) {
1317         case Kerberos:
1318                 sess_data->func = SMB2_auth_kerberos;
1319                 break;
1320         case RawNTLMSSP:
1321                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1322                 break;
1323         default:
1324                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1325                 return -EOPNOTSUPP;
1326         }
1327
1328         return 0;
1329 }
1330
1331 int
1332 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1333                 const struct nls_table *nls_cp)
1334 {
1335         int rc = 0;
1336         struct TCP_Server_Info *server = ses->server;
1337         struct SMB2_sess_data *sess_data;
1338
1339         cifs_dbg(FYI, "Session Setup\n");
1340
1341         if (!server) {
1342                 WARN(1, "%s: server is NULL!\n", __func__);
1343                 return -EIO;
1344         }
1345
1346         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1347         if (!sess_data)
1348                 return -ENOMEM;
1349
1350         rc = SMB2_select_sec(ses, sess_data);
1351         if (rc)
1352                 goto out;
1353         sess_data->xid = xid;
1354         sess_data->ses = ses;
1355         sess_data->buf0_type = CIFS_NO_BUFFER;
1356         sess_data->nls_cp = (struct nls_table *) nls_cp;
1357         sess_data->previous_session = ses->Suid;
1358
1359         /*
1360          * Initialize the session hash with the server one.
1361          */
1362         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1363                SMB2_PREAUTH_HASH_SIZE);
1364
1365         while (sess_data->func)
1366                 sess_data->func(sess_data);
1367
1368         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1369                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1370         rc = sess_data->result;
1371 out:
1372         kfree(sess_data);
1373         return rc;
1374 }
1375
1376 int
1377 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1378 {
1379         struct smb_rqst rqst;
1380         struct smb2_logoff_req *req; /* response is also trivial struct */
1381         int rc = 0;
1382         struct TCP_Server_Info *server;
1383         int flags = 0;
1384         unsigned int total_len;
1385         struct kvec iov[1];
1386         struct kvec rsp_iov;
1387         int resp_buf_type;
1388
1389         cifs_dbg(FYI, "disconnect session %p\n", ses);
1390
1391         if (ses && (ses->server))
1392                 server = ses->server;
1393         else
1394                 return -EIO;
1395
1396         /* no need to send SMB logoff if uid already closed due to reconnect */
1397         if (ses->need_reconnect)
1398                 goto smb2_session_already_dead;
1399
1400         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1401         if (rc)
1402                 return rc;
1403
1404          /* since no tcon, smb2_init can not do this, so do here */
1405         req->sync_hdr.SessionId = ses->Suid;
1406
1407         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1408                 flags |= CIFS_TRANSFORM_REQ;
1409         else if (server->sign)
1410                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1411
1412         flags |= CIFS_NO_RESP;
1413
1414         iov[0].iov_base = (char *)req;
1415         iov[0].iov_len = total_len;
1416
1417         memset(&rqst, 0, sizeof(struct smb_rqst));
1418         rqst.rq_iov = iov;
1419         rqst.rq_nvec = 1;
1420
1421         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1422         cifs_small_buf_release(req);
1423         /*
1424          * No tcon so can't do
1425          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1426          */
1427
1428 smb2_session_already_dead:
1429         return rc;
1430 }
1431
1432 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1433 {
1434         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1435 }
1436
1437 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1438
1439 /* These are similar values to what Windows uses */
1440 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1441 {
1442         tcon->max_chunks = 256;
1443         tcon->max_bytes_chunk = 1048576;
1444         tcon->max_bytes_copy = 16777216;
1445 }
1446
1447 int
1448 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1449           struct cifs_tcon *tcon, const struct nls_table *cp)
1450 {
1451         struct smb_rqst rqst;
1452         struct smb2_tree_connect_req *req;
1453         struct smb2_tree_connect_rsp *rsp = NULL;
1454         struct kvec iov[2];
1455         struct kvec rsp_iov = { NULL, 0 };
1456         int rc = 0;
1457         int resp_buftype;
1458         int unc_path_len;
1459         __le16 *unc_path = NULL;
1460         int flags = 0;
1461         unsigned int total_len;
1462
1463         cifs_dbg(FYI, "TCON\n");
1464
1465         if (!(ses->server) || !tree)
1466                 return -EIO;
1467
1468         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1469         if (unc_path == NULL)
1470                 return -ENOMEM;
1471
1472         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1473         unc_path_len *= 2;
1474         if (unc_path_len < 2) {
1475                 kfree(unc_path);
1476                 return -EINVAL;
1477         }
1478
1479         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1480         tcon->tid = 0;
1481
1482         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1483                              &total_len);
1484         if (rc) {
1485                 kfree(unc_path);
1486                 return rc;
1487         }
1488
1489         if (smb3_encryption_required(tcon))
1490                 flags |= CIFS_TRANSFORM_REQ;
1491
1492         iov[0].iov_base = (char *)req;
1493         /* 1 for pad */
1494         iov[0].iov_len = total_len - 1;
1495
1496         /* Testing shows that buffer offset must be at location of Buffer[0] */
1497         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1498                         - 1 /* pad */);
1499         req->PathLength = cpu_to_le16(unc_path_len - 2);
1500         iov[1].iov_base = unc_path;
1501         iov[1].iov_len = unc_path_len;
1502
1503         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1504         if ((ses->server->dialect == SMB311_PROT_ID) &&
1505             !smb3_encryption_required(tcon))
1506                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507
1508         memset(&rqst, 0, sizeof(struct smb_rqst));
1509         rqst.rq_iov = iov;
1510         rqst.rq_nvec = 2;
1511
1512         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1513         cifs_small_buf_release(req);
1514         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1515
1516         if (rc != 0) {
1517                 if (tcon) {
1518                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1519                         tcon->need_reconnect = true;
1520                 }
1521                 goto tcon_error_exit;
1522         }
1523
1524         switch (rsp->ShareType) {
1525         case SMB2_SHARE_TYPE_DISK:
1526                 cifs_dbg(FYI, "connection to disk share\n");
1527                 break;
1528         case SMB2_SHARE_TYPE_PIPE:
1529                 tcon->pipe = true;
1530                 cifs_dbg(FYI, "connection to pipe share\n");
1531                 break;
1532         case SMB2_SHARE_TYPE_PRINT:
1533                 tcon->print = true;
1534                 cifs_dbg(FYI, "connection to printer\n");
1535                 break;
1536         default:
1537                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1538                 rc = -EOPNOTSUPP;
1539                 goto tcon_error_exit;
1540         }
1541
1542         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1543         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1544         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1545         tcon->tidStatus = CifsGood;
1546         tcon->need_reconnect = false;
1547         tcon->tid = rsp->sync_hdr.TreeId;
1548         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1549
1550         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1551             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1552                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1553
1554         if (tcon->seal &&
1555             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1556                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1557
1558         init_copy_chunk_defaults(tcon);
1559         if (tcon->ses->server->ops->validate_negotiate)
1560                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1561 tcon_exit:
1562         free_rsp_buf(resp_buftype, rsp);
1563         kfree(unc_path);
1564         return rc;
1565
1566 tcon_error_exit:
1567         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1568                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1569         }
1570         goto tcon_exit;
1571 }
1572
1573 int
1574 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1575 {
1576         struct smb_rqst rqst;
1577         struct smb2_tree_disconnect_req *req; /* response is trivial */
1578         int rc = 0;
1579         struct cifs_ses *ses = tcon->ses;
1580         int flags = 0;
1581         unsigned int total_len;
1582         struct kvec iov[1];
1583         struct kvec rsp_iov;
1584         int resp_buf_type;
1585
1586         cifs_dbg(FYI, "Tree Disconnect\n");
1587
1588         if (!ses || !(ses->server))
1589                 return -EIO;
1590
1591         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1592                 return 0;
1593
1594         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1595                              &total_len);
1596         if (rc)
1597                 return rc;
1598
1599         if (smb3_encryption_required(tcon))
1600                 flags |= CIFS_TRANSFORM_REQ;
1601
1602         flags |= CIFS_NO_RESP;
1603
1604         iov[0].iov_base = (char *)req;
1605         iov[0].iov_len = total_len;
1606
1607         memset(&rqst, 0, sizeof(struct smb_rqst));
1608         rqst.rq_iov = iov;
1609         rqst.rq_nvec = 1;
1610
1611         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1612         cifs_small_buf_release(req);
1613         if (rc)
1614                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1615
1616         return rc;
1617 }
1618
1619
1620 static struct create_durable *
1621 create_durable_buf(void)
1622 {
1623         struct create_durable *buf;
1624
1625         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1626         if (!buf)
1627                 return NULL;
1628
1629         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1630                                         (struct create_durable, Data));
1631         buf->ccontext.DataLength = cpu_to_le32(16);
1632         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1633                                 (struct create_durable, Name));
1634         buf->ccontext.NameLength = cpu_to_le16(4);
1635         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1636         buf->Name[0] = 'D';
1637         buf->Name[1] = 'H';
1638         buf->Name[2] = 'n';
1639         buf->Name[3] = 'Q';
1640         return buf;
1641 }
1642
1643 static struct create_durable *
1644 create_reconnect_durable_buf(struct cifs_fid *fid)
1645 {
1646         struct create_durable *buf;
1647
1648         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1649         if (!buf)
1650                 return NULL;
1651
1652         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1653                                         (struct create_durable, Data));
1654         buf->ccontext.DataLength = cpu_to_le32(16);
1655         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1656                                 (struct create_durable, Name));
1657         buf->ccontext.NameLength = cpu_to_le16(4);
1658         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1659         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1660         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1661         buf->Name[0] = 'D';
1662         buf->Name[1] = 'H';
1663         buf->Name[2] = 'n';
1664         buf->Name[3] = 'C';
1665         return buf;
1666 }
1667
1668 static __u8
1669 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1670                   unsigned int *epoch, char *lease_key)
1671 {
1672         char *data_offset;
1673         struct create_context *cc;
1674         unsigned int next;
1675         unsigned int remaining;
1676         char *name;
1677
1678         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1679         remaining = le32_to_cpu(rsp->CreateContextsLength);
1680         cc = (struct create_context *)data_offset;
1681         while (remaining >= sizeof(struct create_context)) {
1682                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1683                 if (le16_to_cpu(cc->NameLength) == 4 &&
1684                     strncmp(name, "RqLs", 4) == 0)
1685                         return server->ops->parse_lease_buf(cc, epoch,
1686                                                             lease_key);
1687
1688                 next = le32_to_cpu(cc->Next);
1689                 if (!next)
1690                         break;
1691                 remaining -= next;
1692                 cc = (struct create_context *)((char *)cc + next);
1693         }
1694
1695         return 0;
1696 }
1697
1698 static int
1699 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1700                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1701 {
1702         struct smb2_create_req *req = iov[0].iov_base;
1703         unsigned int num = *num_iovec;
1704
1705         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1706         if (iov[num].iov_base == NULL)
1707                 return -ENOMEM;
1708         iov[num].iov_len = server->vals->create_lease_size;
1709         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1710         if (!req->CreateContextsOffset)
1711                 req->CreateContextsOffset = cpu_to_le32(
1712                                 sizeof(struct smb2_create_req) +
1713                                 iov[num - 1].iov_len);
1714         le32_add_cpu(&req->CreateContextsLength,
1715                      server->vals->create_lease_size);
1716         *num_iovec = num + 1;
1717         return 0;
1718 }
1719
1720 static struct create_durable_v2 *
1721 create_durable_v2_buf(struct cifs_fid *pfid)
1722 {
1723         struct create_durable_v2 *buf;
1724
1725         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1726         if (!buf)
1727                 return NULL;
1728
1729         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1730                                         (struct create_durable_v2, dcontext));
1731         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1732         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1733                                 (struct create_durable_v2, Name));
1734         buf->ccontext.NameLength = cpu_to_le16(4);
1735
1736         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1737         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1738         generate_random_uuid(buf->dcontext.CreateGuid);
1739         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1740
1741         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1742         buf->Name[0] = 'D';
1743         buf->Name[1] = 'H';
1744         buf->Name[2] = '2';
1745         buf->Name[3] = 'Q';
1746         return buf;
1747 }
1748
1749 static struct create_durable_handle_reconnect_v2 *
1750 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1751 {
1752         struct create_durable_handle_reconnect_v2 *buf;
1753
1754         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1755                         GFP_KERNEL);
1756         if (!buf)
1757                 return NULL;
1758
1759         buf->ccontext.DataOffset =
1760                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1761                                      dcontext));
1762         buf->ccontext.DataLength =
1763                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1764         buf->ccontext.NameOffset =
1765                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1766                             Name));
1767         buf->ccontext.NameLength = cpu_to_le16(4);
1768
1769         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1770         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1771         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1772         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1773
1774         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1775         buf->Name[0] = 'D';
1776         buf->Name[1] = 'H';
1777         buf->Name[2] = '2';
1778         buf->Name[3] = 'C';
1779         return buf;
1780 }
1781
1782 static int
1783 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1784                     struct cifs_open_parms *oparms)
1785 {
1786         struct smb2_create_req *req = iov[0].iov_base;
1787         unsigned int num = *num_iovec;
1788
1789         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1790         if (iov[num].iov_base == NULL)
1791                 return -ENOMEM;
1792         iov[num].iov_len = sizeof(struct create_durable_v2);
1793         if (!req->CreateContextsOffset)
1794                 req->CreateContextsOffset =
1795                         cpu_to_le32(sizeof(struct smb2_create_req) +
1796                                                                 iov[1].iov_len);
1797         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1798         *num_iovec = num + 1;
1799         return 0;
1800 }
1801
1802 static int
1803 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1804                     struct cifs_open_parms *oparms)
1805 {
1806         struct smb2_create_req *req = iov[0].iov_base;
1807         unsigned int num = *num_iovec;
1808
1809         /* indicate that we don't need to relock the file */
1810         oparms->reconnect = false;
1811
1812         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1813         if (iov[num].iov_base == NULL)
1814                 return -ENOMEM;
1815         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1816         if (!req->CreateContextsOffset)
1817                 req->CreateContextsOffset =
1818                         cpu_to_le32(sizeof(struct smb2_create_req) +
1819                                                                 iov[1].iov_len);
1820         le32_add_cpu(&req->CreateContextsLength,
1821                         sizeof(struct create_durable_handle_reconnect_v2));
1822         *num_iovec = num + 1;
1823         return 0;
1824 }
1825
1826 static int
1827 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1828                     struct cifs_open_parms *oparms, bool use_persistent)
1829 {
1830         struct smb2_create_req *req = iov[0].iov_base;
1831         unsigned int num = *num_iovec;
1832
1833         if (use_persistent) {
1834                 if (oparms->reconnect)
1835                         return add_durable_reconnect_v2_context(iov, num_iovec,
1836                                                                 oparms);
1837                 else
1838                         return add_durable_v2_context(iov, num_iovec, oparms);
1839         }
1840
1841         if (oparms->reconnect) {
1842                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1843                 /* indicate that we don't need to relock the file */
1844                 oparms->reconnect = false;
1845         } else
1846                 iov[num].iov_base = create_durable_buf();
1847         if (iov[num].iov_base == NULL)
1848                 return -ENOMEM;
1849         iov[num].iov_len = sizeof(struct create_durable);
1850         if (!req->CreateContextsOffset)
1851                 req->CreateContextsOffset =
1852                         cpu_to_le32(sizeof(struct smb2_create_req) +
1853                                                                 iov[1].iov_len);
1854         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1855         *num_iovec = num + 1;
1856         return 0;
1857 }
1858
1859 /* See MS-SMB2 2.2.13.2.7 */
1860 static struct crt_twarp_ctxt *
1861 create_twarp_buf(__u64 timewarp)
1862 {
1863         struct crt_twarp_ctxt *buf;
1864
1865         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1866         if (!buf)
1867                 return NULL;
1868
1869         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1870                                         (struct crt_twarp_ctxt, Timestamp));
1871         buf->ccontext.DataLength = cpu_to_le32(8);
1872         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1873                                 (struct crt_twarp_ctxt, Name));
1874         buf->ccontext.NameLength = cpu_to_le16(4);
1875         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1876         buf->Name[0] = 'T';
1877         buf->Name[1] = 'W';
1878         buf->Name[2] = 'r';
1879         buf->Name[3] = 'p';
1880         buf->Timestamp = cpu_to_le64(timewarp);
1881         return buf;
1882 }
1883
1884 /* See MS-SMB2 2.2.13.2.7 */
1885 static int
1886 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1887 {
1888         struct smb2_create_req *req = iov[0].iov_base;
1889         unsigned int num = *num_iovec;
1890
1891         iov[num].iov_base = create_twarp_buf(timewarp);
1892         if (iov[num].iov_base == NULL)
1893                 return -ENOMEM;
1894         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1895         if (!req->CreateContextsOffset)
1896                 req->CreateContextsOffset = cpu_to_le32(
1897                                 sizeof(struct smb2_create_req) +
1898                                 iov[num - 1].iov_len);
1899         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1900         *num_iovec = num + 1;
1901         return 0;
1902 }
1903
1904 static int
1905 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1906                             const char *treename, const __le16 *path)
1907 {
1908         int treename_len, path_len;
1909         struct nls_table *cp;
1910         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1911
1912         /*
1913          * skip leading "\\"
1914          */
1915         treename_len = strlen(treename);
1916         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1917                 return -EINVAL;
1918
1919         treename += 2;
1920         treename_len -= 2;
1921
1922         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1923
1924         /*
1925          * make room for one path separator between the treename and
1926          * path
1927          */
1928         *out_len = treename_len + 1 + path_len;
1929
1930         /*
1931          * final path needs to be null-terminated UTF16 with a
1932          * size aligned to 8
1933          */
1934
1935         *out_size = roundup((*out_len+1)*2, 8);
1936         *out_path = kzalloc(*out_size, GFP_KERNEL);
1937         if (!*out_path)
1938                 return -ENOMEM;
1939
1940         cp = load_nls_default();
1941         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1942         UniStrcat(*out_path, sep);
1943         UniStrcat(*out_path, path);
1944         unload_nls(cp);
1945
1946         return 0;
1947 }
1948
1949 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
1950                                umode_t mode, struct cifs_tcon *tcon,
1951                                const char *full_path,
1952                                struct cifs_sb_info *cifs_sb)
1953 {
1954         struct smb_rqst rqst;
1955         struct smb2_create_req *req;
1956         struct smb2_create_rsp *rsp = NULL;
1957         struct TCP_Server_Info *server;
1958         struct cifs_ses *ses = tcon->ses;
1959         struct kvec iov[3]; /* make sure at least one for each open context */
1960         struct kvec rsp_iov = {NULL, 0};
1961         int resp_buftype;
1962         int uni_path_len;
1963         __le16 *copy_path = NULL;
1964         int copy_size;
1965         int rc = 0;
1966         unsigned int n_iov = 2;
1967         __u32 file_attributes = 0;
1968         char *pc_buf = NULL;
1969         int flags = 0;
1970         unsigned int total_len;
1971         __le16 *utf16_path = NULL;
1972
1973         cifs_dbg(FYI, "mkdir\n");
1974
1975         /* resource #1: path allocation */
1976         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1977         if (!utf16_path)
1978                 return -ENOMEM;
1979
1980         if (ses && (ses->server))
1981                 server = ses->server;
1982         else {
1983                 rc = -EIO;
1984                 goto err_free_path;
1985         }
1986
1987         /* resource #2: request */
1988         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1989         if (rc)
1990                 goto err_free_path;
1991
1992
1993         if (smb3_encryption_required(tcon))
1994                 flags |= CIFS_TRANSFORM_REQ;
1995
1996         req->ImpersonationLevel = IL_IMPERSONATION;
1997         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
1998         /* File attributes ignored on open (used in create though) */
1999         req->FileAttributes = cpu_to_le32(file_attributes);
2000         req->ShareAccess = FILE_SHARE_ALL_LE;
2001         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2002         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2003
2004         iov[0].iov_base = (char *)req;
2005         /* -1 since last byte is buf[0] which is sent below (path) */
2006         iov[0].iov_len = total_len - 1;
2007
2008         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2009
2010         /* [MS-SMB2] 2.2.13 NameOffset:
2011          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2012          * the SMB2 header, the file name includes a prefix that will
2013          * be processed during DFS name normalization as specified in
2014          * section 3.3.5.9. Otherwise, the file name is relative to
2015          * the share that is identified by the TreeId in the SMB2
2016          * header.
2017          */
2018         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2019                 int name_len;
2020
2021                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2022                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2023                                                  &name_len,
2024                                                  tcon->treeName, utf16_path);
2025                 if (rc)
2026                         goto err_free_req;
2027
2028                 req->NameLength = cpu_to_le16(name_len * 2);
2029                 uni_path_len = copy_size;
2030                 /* free before overwriting resource */
2031                 kfree(utf16_path);
2032                 utf16_path = copy_path;
2033         } else {
2034                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2035                 /* MUST set path len (NameLength) to 0 opening root of share */
2036                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2037                 if (uni_path_len % 8 != 0) {
2038                         copy_size = roundup(uni_path_len, 8);
2039                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2040                         if (!copy_path) {
2041                                 rc = -ENOMEM;
2042                                 goto err_free_req;
2043                         }
2044                         memcpy((char *)copy_path, (const char *)utf16_path,
2045                                uni_path_len);
2046                         uni_path_len = copy_size;
2047                         /* free before overwriting resource */
2048                         kfree(utf16_path);
2049                         utf16_path = copy_path;
2050                 }
2051         }
2052
2053         iov[1].iov_len = uni_path_len;
2054         iov[1].iov_base = utf16_path;
2055         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2056
2057         if (tcon->posix_extensions) {
2058                 /* resource #3: posix buf */
2059                 rc = add_posix_context(iov, &n_iov, mode);
2060                 if (rc)
2061                         goto err_free_req;
2062                 pc_buf = iov[n_iov-1].iov_base;
2063         }
2064
2065
2066         memset(&rqst, 0, sizeof(struct smb_rqst));
2067         rqst.rq_iov = iov;
2068         rqst.rq_nvec = n_iov;
2069
2070         /* resource #4: response buffer */
2071         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2072         if (rc) {
2073                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2074                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2075                                            CREATE_NOT_FILE,
2076                                            FILE_WRITE_ATTRIBUTES, rc);
2077                 goto err_free_rsp_buf;
2078         }
2079
2080         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2081         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2082                                     ses->Suid, CREATE_NOT_FILE,
2083                                     FILE_WRITE_ATTRIBUTES);
2084
2085         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2086
2087         /* Eventually save off posix specific response info and timestaps */
2088
2089 err_free_rsp_buf:
2090         free_rsp_buf(resp_buftype, rsp);
2091         kfree(pc_buf);
2092 err_free_req:
2093         cifs_small_buf_release(req);
2094 err_free_path:
2095         kfree(utf16_path);
2096         return rc;
2097 }
2098
2099 int
2100 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2101                struct cifs_open_parms *oparms, __le16 *path)
2102 {
2103         struct TCP_Server_Info *server = tcon->ses->server;
2104         struct smb2_create_req *req;
2105         unsigned int n_iov = 2;
2106         __u32 file_attributes = 0;
2107         int copy_size;
2108         int uni_path_len;
2109         unsigned int total_len;
2110         struct kvec *iov = rqst->rq_iov;
2111         __le16 *copy_path;
2112         int rc;
2113
2114         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2115         if (rc)
2116                 return rc;
2117
2118         iov[0].iov_base = (char *)req;
2119         /* -1 since last byte is buf[0] which is sent below (path) */
2120         iov[0].iov_len = total_len - 1;
2121
2122         if (oparms->create_options & CREATE_OPTION_READONLY)
2123                 file_attributes |= ATTR_READONLY;
2124         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2125                 file_attributes |= ATTR_SYSTEM;
2126
2127         req->ImpersonationLevel = IL_IMPERSONATION;
2128         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2129         /* File attributes ignored on open (used in create though) */
2130         req->FileAttributes = cpu_to_le32(file_attributes);
2131         req->ShareAccess = FILE_SHARE_ALL_LE;
2132         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2133         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2134         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2135
2136         /* [MS-SMB2] 2.2.13 NameOffset:
2137          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2138          * the SMB2 header, the file name includes a prefix that will
2139          * be processed during DFS name normalization as specified in
2140          * section 3.3.5.9. Otherwise, the file name is relative to
2141          * the share that is identified by the TreeId in the SMB2
2142          * header.
2143          */
2144         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2145                 int name_len;
2146
2147                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2148                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2149                                                  &name_len,
2150                                                  tcon->treeName, path);
2151                 if (rc)
2152                         return rc;
2153                 req->NameLength = cpu_to_le16(name_len * 2);
2154                 uni_path_len = copy_size;
2155                 path = copy_path;
2156         } else {
2157                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2158                 /* MUST set path len (NameLength) to 0 opening root of share */
2159                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2160                 copy_size = uni_path_len;
2161                 if (copy_size % 8 != 0)
2162                         copy_size = roundup(copy_size, 8);
2163                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2164                 if (!copy_path)
2165                         return -ENOMEM;
2166                 memcpy((char *)copy_path, (const char *)path,
2167                        uni_path_len);
2168                 uni_path_len = copy_size;
2169                 path = copy_path;
2170         }
2171
2172         iov[1].iov_len = uni_path_len;
2173         iov[1].iov_base = path;
2174
2175         if (!server->oplocks)
2176                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2177
2178         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2179             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2180                 req->RequestedOplockLevel = *oplock;
2181         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2182                   (oparms->create_options & CREATE_NOT_FILE))
2183                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2184         else {
2185                 rc = add_lease_context(server, iov, &n_iov,
2186                                        oparms->fid->lease_key, oplock);
2187                 if (rc)
2188                         return rc;
2189         }
2190
2191         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2192                 /* need to set Next field of lease context if we request it */
2193                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2194                         struct create_context *ccontext =
2195                             (struct create_context *)iov[n_iov-1].iov_base;
2196                         ccontext->Next =
2197                                 cpu_to_le32(server->vals->create_lease_size);
2198                 }
2199
2200                 rc = add_durable_context(iov, &n_iov, oparms,
2201                                         tcon->use_persistent);
2202                 if (rc)
2203                         return rc;
2204         }
2205
2206         if (tcon->posix_extensions) {
2207                 if (n_iov > 2) {
2208                         struct create_context *ccontext =
2209                             (struct create_context *)iov[n_iov-1].iov_base;
2210                         ccontext->Next =
2211                                 cpu_to_le32(iov[n_iov-1].iov_len);
2212                 }
2213
2214                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2215                 if (rc)
2216                         return rc;
2217         }
2218
2219         if (tcon->snapshot_time) {
2220                 cifs_dbg(FYI, "adding snapshot context\n");
2221                 if (n_iov > 2) {
2222                         struct create_context *ccontext =
2223                             (struct create_context *)iov[n_iov-1].iov_base;
2224                         ccontext->Next =
2225                                 cpu_to_le32(iov[n_iov-1].iov_len);
2226                 }
2227
2228                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2229                 if (rc)
2230                         return rc;
2231         }
2232
2233
2234         rqst->rq_nvec = n_iov;
2235         return 0;
2236 }
2237
2238 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2239  * All other vectors are freed by kfree().
2240  */
2241 void
2242 SMB2_open_free(struct smb_rqst *rqst)
2243 {
2244         int i;
2245
2246         cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2247         for (i = 1; i < rqst->rq_nvec; i++)
2248                 if (rqst->rq_iov[i].iov_base != smb2_padding)
2249                         kfree(rqst->rq_iov[i].iov_base);
2250 }
2251
2252 int
2253 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2254           __u8 *oplock, struct smb2_file_all_info *buf,
2255           struct kvec *err_iov, int *buftype)
2256 {
2257         struct smb_rqst rqst;
2258         struct smb2_create_rsp *rsp = NULL;
2259         struct TCP_Server_Info *server;
2260         struct cifs_tcon *tcon = oparms->tcon;
2261         struct cifs_ses *ses = tcon->ses;
2262         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2263         struct kvec rsp_iov = {NULL, 0};
2264         int resp_buftype;
2265         int rc = 0;
2266         int flags = 0;
2267
2268         cifs_dbg(FYI, "create/open\n");
2269         if (ses && (ses->server))
2270                 server = ses->server;
2271         else
2272                 return -EIO;
2273
2274         if (smb3_encryption_required(tcon))
2275                 flags |= CIFS_TRANSFORM_REQ;
2276
2277         memset(&rqst, 0, sizeof(struct smb_rqst));
2278         memset(&iov, 0, sizeof(iov));
2279         rqst.rq_iov = iov;
2280         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2281
2282         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2283         if (rc)
2284                 goto creat_exit;
2285
2286         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2287                             &rsp_iov);
2288         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2289
2290         if (rc != 0) {
2291                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2292                 if (err_iov && rsp) {
2293                         *err_iov = rsp_iov;
2294                         *buftype = resp_buftype;
2295                         resp_buftype = CIFS_NO_BUFFER;
2296                         rsp = NULL;
2297                 }
2298                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2299                                     oparms->create_options, oparms->desired_access, rc);
2300                 goto creat_exit;
2301         } else
2302                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2303                                      ses->Suid, oparms->create_options,
2304                                      oparms->desired_access);
2305
2306         oparms->fid->persistent_fid = rsp->PersistentFileId;
2307         oparms->fid->volatile_fid = rsp->VolatileFileId;
2308
2309         if (buf) {
2310                 memcpy(buf, &rsp->CreationTime, 32);
2311                 buf->AllocationSize = rsp->AllocationSize;
2312                 buf->EndOfFile = rsp->EndofFile;
2313                 buf->Attributes = rsp->FileAttributes;
2314                 buf->NumberOfLinks = cpu_to_le32(1);
2315                 buf->DeletePending = 0;
2316         }
2317
2318         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2319                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2320                                             oparms->fid->lease_key);
2321         else
2322                 *oplock = rsp->OplockLevel;
2323 creat_exit:
2324         SMB2_open_free(&rqst);
2325         free_rsp_buf(resp_buftype, rsp);
2326         return rc;
2327 }
2328
2329 /*
2330  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2331  */
2332 int
2333 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2334            u64 volatile_fid, u32 opcode, bool is_fsctl,
2335            char *in_data, u32 indatalen,
2336            char **out_data, u32 *plen /* returned data len */)
2337 {
2338         struct smb_rqst rqst;
2339         struct smb2_ioctl_req *req;
2340         struct smb2_ioctl_rsp *rsp;
2341         struct cifs_ses *ses;
2342         struct kvec iov[2];
2343         struct kvec rsp_iov;
2344         int resp_buftype;
2345         int n_iov;
2346         int rc = 0;
2347         int flags = 0;
2348         unsigned int total_len;
2349
2350         cifs_dbg(FYI, "SMB2 IOCTL\n");
2351
2352         if (out_data != NULL)
2353                 *out_data = NULL;
2354
2355         /* zero out returned data len, in case of error */
2356         if (plen)
2357                 *plen = 0;
2358
2359         if (tcon)
2360                 ses = tcon->ses;
2361         else
2362                 return -EIO;
2363
2364         if (!ses || !(ses->server))
2365                 return -EIO;
2366
2367         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2368         if (rc)
2369                 return rc;
2370
2371         if (smb3_encryption_required(tcon))
2372                 flags |= CIFS_TRANSFORM_REQ;
2373
2374         req->CtlCode = cpu_to_le32(opcode);
2375         req->PersistentFileId = persistent_fid;
2376         req->VolatileFileId = volatile_fid;
2377
2378         if (indatalen) {
2379                 req->InputCount = cpu_to_le32(indatalen);
2380                 /* do not set InputOffset if no input data */
2381                 req->InputOffset =
2382                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2383                 iov[1].iov_base = in_data;
2384                 iov[1].iov_len = indatalen;
2385                 n_iov = 2;
2386         } else
2387                 n_iov = 1;
2388
2389         req->OutputOffset = 0;
2390         req->OutputCount = 0; /* MBZ */
2391
2392         /*
2393          * Could increase MaxOutputResponse, but that would require more
2394          * than one credit. Windows typically sets this smaller, but for some
2395          * ioctls it may be useful to allow server to send more. No point
2396          * limiting what the server can send as long as fits in one credit
2397          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2398          * (by default, note that it can be overridden to make max larger)
2399          * in responses (except for read responses which can be bigger.
2400          * We may want to bump this limit up
2401          */
2402         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2403
2404         if (is_fsctl)
2405                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2406         else
2407                 req->Flags = 0;
2408
2409         iov[0].iov_base = (char *)req;
2410
2411         /*
2412          * If no input data, the size of ioctl struct in
2413          * protocol spec still includes a 1 byte data buffer,
2414          * but if input data passed to ioctl, we do not
2415          * want to double count this, so we do not send
2416          * the dummy one byte of data in iovec[0] if sending
2417          * input data (in iovec[1]).
2418          */
2419
2420         if (indatalen) {
2421                 iov[0].iov_len = total_len - 1;
2422         } else
2423                 iov[0].iov_len = total_len;
2424
2425         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2426         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2427                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2428
2429         memset(&rqst, 0, sizeof(struct smb_rqst));
2430         rqst.rq_iov = iov;
2431         rqst.rq_nvec = n_iov;
2432
2433         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2434                             &rsp_iov);
2435         cifs_small_buf_release(req);
2436         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2437
2438         if (rc != 0)
2439                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2440                                 ses->Suid, 0, opcode, rc);
2441
2442         if ((rc != 0) && (rc != -EINVAL)) {
2443                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2444                 goto ioctl_exit;
2445         } else if (rc == -EINVAL) {
2446                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2447                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2448                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2449                         goto ioctl_exit;
2450                 }
2451         }
2452
2453         /* check if caller wants to look at return data or just return rc */
2454         if ((plen == NULL) || (out_data == NULL))
2455                 goto ioctl_exit;
2456
2457         *plen = le32_to_cpu(rsp->OutputCount);
2458
2459         /* We check for obvious errors in the output buffer length and offset */
2460         if (*plen == 0)
2461                 goto ioctl_exit; /* server returned no data */
2462         else if (*plen > 0xFF00) {
2463                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2464                 *plen = 0;
2465                 rc = -EIO;
2466                 goto ioctl_exit;
2467         }
2468
2469         if (rsp_iov.iov_len < le32_to_cpu(rsp->OutputOffset) + *plen) {
2470                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2471                         le32_to_cpu(rsp->OutputOffset));
2472                 *plen = 0;
2473                 rc = -EIO;
2474                 goto ioctl_exit;
2475         }
2476
2477         *out_data = kmalloc(*plen, GFP_KERNEL);
2478         if (*out_data == NULL) {
2479                 rc = -ENOMEM;
2480                 goto ioctl_exit;
2481         }
2482
2483         memcpy(*out_data, (char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen);
2484 ioctl_exit:
2485         free_rsp_buf(resp_buftype, rsp);
2486         return rc;
2487 }
2488
2489 /*
2490  *   Individual callers to ioctl worker function follow
2491  */
2492
2493 int
2494 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2495                      u64 persistent_fid, u64 volatile_fid)
2496 {
2497         int rc;
2498         struct  compress_ioctl fsctl_input;
2499         char *ret_data = NULL;
2500
2501         fsctl_input.CompressionState =
2502                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2503
2504         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2505                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2506                         (char *)&fsctl_input /* data input */,
2507                         2 /* in data len */, &ret_data /* out data */, NULL);
2508
2509         cifs_dbg(FYI, "set compression rc %d\n", rc);
2510
2511         return rc;
2512 }
2513
2514 int
2515 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2516                 u64 persistent_fid, u64 volatile_fid)
2517 {
2518         struct smb2_close_req *req;
2519         struct kvec *iov = rqst->rq_iov;
2520         unsigned int total_len;
2521         int rc;
2522
2523         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2524         if (rc)
2525                 return rc;
2526
2527         req->PersistentFileId = persistent_fid;
2528         req->VolatileFileId = volatile_fid;
2529         iov[0].iov_base = (char *)req;
2530         iov[0].iov_len = total_len;
2531
2532         return 0;
2533 }
2534
2535 void
2536 SMB2_close_free(struct smb_rqst *rqst)
2537 {
2538         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2539 }
2540
2541 int
2542 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2543                  u64 persistent_fid, u64 volatile_fid, int flags)
2544 {
2545         struct smb_rqst rqst;
2546         struct smb2_close_rsp *rsp = NULL;
2547         struct cifs_ses *ses = tcon->ses;
2548         struct kvec iov[1];
2549         struct kvec rsp_iov;
2550         int resp_buftype;
2551         int rc = 0;
2552
2553         cifs_dbg(FYI, "Close\n");
2554
2555         if (!ses || !(ses->server))
2556                 return -EIO;
2557
2558         if (smb3_encryption_required(tcon))
2559                 flags |= CIFS_TRANSFORM_REQ;
2560
2561         memset(&rqst, 0, sizeof(struct smb_rqst));
2562         memset(&iov, 0, sizeof(iov));
2563         rqst.rq_iov = iov;
2564         rqst.rq_nvec = 1;
2565
2566         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2567         if (rc)
2568                 goto close_exit;
2569
2570         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2571         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2572
2573         if (rc != 0) {
2574                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2575                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2576                                      rc);
2577                 goto close_exit;
2578         }
2579
2580         /* BB FIXME - decode close response, update inode for caching */
2581
2582 close_exit:
2583         SMB2_close_free(&rqst);
2584         free_rsp_buf(resp_buftype, rsp);
2585         return rc;
2586 }
2587
2588 int
2589 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2590            u64 persistent_fid, u64 volatile_fid)
2591 {
2592         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2593 }
2594
2595 int
2596 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2597                   struct kvec *iov, unsigned int min_buf_size)
2598 {
2599         unsigned int smb_len = iov->iov_len;
2600         char *end_of_smb = smb_len + (char *)iov->iov_base;
2601         char *begin_of_buf = offset + (char *)iov->iov_base;
2602         char *end_of_buf = begin_of_buf + buffer_length;
2603
2604
2605         if (buffer_length < min_buf_size) {
2606                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2607                          buffer_length, min_buf_size);
2608                 return -EINVAL;
2609         }
2610
2611         /* check if beyond RFC1001 maximum length */
2612         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2613                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2614                          buffer_length, smb_len);
2615                 return -EINVAL;
2616         }
2617
2618         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2619                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2620                 return -EINVAL;
2621         }
2622
2623         return 0;
2624 }
2625
2626 /*
2627  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2628  * Caller must free buffer.
2629  */
2630 static int
2631 validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2632                       struct kvec *iov, unsigned int minbufsize,
2633                       char *data)
2634 {
2635         char *begin_of_buf = offset + (char *)iov->iov_base;
2636         int rc;
2637
2638         if (!data)
2639                 return -EINVAL;
2640
2641         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2642         if (rc)
2643                 return rc;
2644
2645         memcpy(data, begin_of_buf, buffer_length);
2646
2647         return 0;
2648 }
2649
2650 int
2651 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2652                      u64 persistent_fid, u64 volatile_fid,
2653                      u8 info_class, u8 info_type, u32 additional_info,
2654                      size_t output_len)
2655 {
2656         struct smb2_query_info_req *req;
2657         struct kvec *iov = rqst->rq_iov;
2658         unsigned int total_len;
2659         int rc;
2660
2661         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2662                              &total_len);
2663         if (rc)
2664                 return rc;
2665
2666         req->InfoType = info_type;
2667         req->FileInfoClass = info_class;
2668         req->PersistentFileId = persistent_fid;
2669         req->VolatileFileId = volatile_fid;
2670         req->AdditionalInformation = cpu_to_le32(additional_info);
2671
2672         /*
2673          * We do not use the input buffer (do not send extra byte)
2674          */
2675         req->InputBufferOffset = 0;
2676
2677         req->OutputBufferLength = cpu_to_le32(output_len);
2678
2679         iov[0].iov_base = (char *)req;
2680         /* 1 for Buffer */
2681         iov[0].iov_len = total_len - 1;
2682         return 0;
2683 }
2684
2685 void
2686 SMB2_query_info_free(struct smb_rqst *rqst)
2687 {
2688         cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2689 }
2690
2691 static int
2692 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2693            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2694            u32 additional_info, size_t output_len, size_t min_len, void **data,
2695                 u32 *dlen)
2696 {
2697         struct smb_rqst rqst;
2698         struct smb2_query_info_rsp *rsp = NULL;
2699         struct kvec iov[1];
2700         struct kvec rsp_iov;
2701         int rc = 0;
2702         int resp_buftype;
2703         struct cifs_ses *ses = tcon->ses;
2704         int flags = 0;
2705
2706         cifs_dbg(FYI, "Query Info\n");
2707
2708         if (!ses || !(ses->server))
2709                 return -EIO;
2710
2711         if (smb3_encryption_required(tcon))
2712                 flags |= CIFS_TRANSFORM_REQ;
2713
2714         memset(&rqst, 0, sizeof(struct smb_rqst));
2715         memset(&iov, 0, sizeof(iov));
2716         rqst.rq_iov = iov;
2717         rqst.rq_nvec = 1;
2718
2719         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2720                                   info_class, info_type, additional_info,
2721                                   output_len);
2722         if (rc)
2723                 goto qinf_exit;
2724
2725         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2726         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2727
2728         if (rc) {
2729                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2730                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2731                                 ses->Suid, info_class, (__u32)info_type, rc);
2732                 goto qinf_exit;
2733         }
2734
2735         if (dlen) {
2736                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2737                 if (!*data) {
2738                         *data = kmalloc(*dlen, GFP_KERNEL);
2739                         if (!*data) {
2740                                 cifs_dbg(VFS,
2741                                         "Error %d allocating memory for acl\n",
2742                                         rc);
2743                                 *dlen = 0;
2744                                 goto qinf_exit;
2745                         }
2746                 }
2747         }
2748
2749         rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2750                                    le32_to_cpu(rsp->OutputBufferLength),
2751                                    &rsp_iov, min_len, *data);
2752
2753 qinf_exit:
2754         SMB2_query_info_free(&rqst);
2755         free_rsp_buf(resp_buftype, rsp);
2756         return rc;
2757 }
2758
2759 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2760                    u64 persistent_fid, u64 volatile_fid,
2761                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2762 {
2763         return query_info(xid, tcon, persistent_fid, volatile_fid,
2764                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2765                           ea_buf_size,
2766                           sizeof(struct smb2_file_full_ea_info),
2767                           (void **)&data,
2768                           NULL);
2769 }
2770
2771 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2772         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2773 {
2774         return query_info(xid, tcon, persistent_fid, volatile_fid,
2775                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2776                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2777                           sizeof(struct smb2_file_all_info), (void **)&data,
2778                           NULL);
2779 }
2780
2781 int
2782 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2783                 u64 persistent_fid, u64 volatile_fid,
2784                 void **data, u32 *plen)
2785 {
2786         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2787         *plen = 0;
2788
2789         return query_info(xid, tcon, persistent_fid, volatile_fid,
2790                           0, SMB2_O_INFO_SECURITY, additional_info,
2791                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2792 }
2793
2794 int
2795 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2796                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2797 {
2798         return query_info(xid, tcon, persistent_fid, volatile_fid,
2799                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2800                           sizeof(struct smb2_file_internal_info),
2801                           sizeof(struct smb2_file_internal_info),
2802                           (void **)&uniqueid, NULL);
2803 }
2804
2805 /*
2806  * This is a no-op for now. We're not really interested in the reply, but
2807  * rather in the fact that the server sent one and that server->lstrp
2808  * gets updated.
2809  *
2810  * FIXME: maybe we should consider checking that the reply matches request?
2811  */
2812 static void
2813 smb2_echo_callback(struct mid_q_entry *mid)
2814 {
2815         struct TCP_Server_Info *server = mid->callback_data;
2816         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2817         unsigned int credits_received = 1;
2818
2819         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2820                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2821
2822         DeleteMidQEntry(mid);
2823         add_credits(server, credits_received, CIFS_ECHO_OP);
2824 }
2825
2826 void smb2_reconnect_server(struct work_struct *work)
2827 {
2828         struct TCP_Server_Info *server = container_of(work,
2829                                         struct TCP_Server_Info, reconnect.work);
2830         struct cifs_ses *ses;
2831         struct cifs_tcon *tcon, *tcon2;
2832         struct list_head tmp_list;
2833         int tcon_exist = false;
2834         int rc;
2835         int resched = false;
2836
2837
2838         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2839         mutex_lock(&server->reconnect_mutex);
2840
2841         INIT_LIST_HEAD(&tmp_list);
2842         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2843
2844         spin_lock(&cifs_tcp_ses_lock);
2845         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2846                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2847                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2848                                 tcon->tc_count++;
2849                                 list_add_tail(&tcon->rlist, &tmp_list);
2850                                 tcon_exist = true;
2851                         }
2852                 }
2853                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2854                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2855                         tcon_exist = true;
2856                 }
2857         }
2858         /*
2859          * Get the reference to server struct to be sure that the last call of
2860          * cifs_put_tcon() in the loop below won't release the server pointer.
2861          */
2862         if (tcon_exist)
2863                 server->srv_count++;
2864
2865         spin_unlock(&cifs_tcp_ses_lock);
2866
2867         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2868                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2869                 if (!rc)
2870                         cifs_reopen_persistent_handles(tcon);
2871                 else
2872                         resched = true;
2873                 list_del_init(&tcon->rlist);
2874                 cifs_put_tcon(tcon);
2875         }
2876
2877         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2878         if (resched)
2879                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2880         mutex_unlock(&server->reconnect_mutex);
2881
2882         /* now we can safely release srv struct */
2883         if (tcon_exist)
2884                 cifs_put_tcp_session(server, 1);
2885 }
2886
2887 int
2888 SMB2_echo(struct TCP_Server_Info *server)
2889 {
2890         struct smb2_echo_req *req;
2891         int rc = 0;
2892         struct kvec iov[1];
2893         struct smb_rqst rqst = { .rq_iov = iov,
2894                                  .rq_nvec = 1 };
2895         unsigned int total_len;
2896
2897         cifs_dbg(FYI, "In echo request\n");
2898
2899         if (server->tcpStatus == CifsNeedNegotiate) {
2900                 /* No need to send echo on newly established connections */
2901                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2902                 return rc;
2903         }
2904
2905         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2906         if (rc)
2907                 return rc;
2908
2909         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2910
2911         iov[0].iov_len = total_len;
2912         iov[0].iov_base = (char *)req;
2913
2914         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2915                              server, CIFS_ECHO_OP);
2916         if (rc)
2917                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2918
2919         cifs_small_buf_release(req);
2920         return rc;
2921 }
2922
2923 int
2924 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2925            u64 volatile_fid)
2926 {
2927         struct smb_rqst rqst;
2928         struct smb2_flush_req *req;
2929         struct cifs_ses *ses = tcon->ses;
2930         struct kvec iov[1];
2931         struct kvec rsp_iov;
2932         int resp_buftype;
2933         int rc = 0;
2934         int flags = 0;
2935         unsigned int total_len;
2936
2937         cifs_dbg(FYI, "Flush\n");
2938
2939         if (!ses || !(ses->server))
2940                 return -EIO;
2941
2942         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2943         if (rc)
2944                 return rc;
2945
2946         if (smb3_encryption_required(tcon))
2947                 flags |= CIFS_TRANSFORM_REQ;
2948
2949         req->PersistentFileId = persistent_fid;
2950         req->VolatileFileId = volatile_fid;
2951
2952         iov[0].iov_base = (char *)req;
2953         iov[0].iov_len = total_len;
2954
2955         memset(&rqst, 0, sizeof(struct smb_rqst));
2956         rqst.rq_iov = iov;
2957         rqst.rq_nvec = 1;
2958
2959         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2960         cifs_small_buf_release(req);
2961
2962         if (rc != 0) {
2963                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2964                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2965                                      rc);
2966         }
2967
2968         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2969         return rc;
2970 }
2971
2972 /*
2973  * To form a chain of read requests, any read requests after the first should
2974  * have the end_of_chain boolean set to true.
2975  */
2976 static int
2977 smb2_new_read_req(void **buf, unsigned int *total_len,
2978         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2979         unsigned int remaining_bytes, int request_type)
2980 {
2981         int rc = -EACCES;
2982         struct smb2_read_plain_req *req = NULL;
2983         struct smb2_sync_hdr *shdr;
2984         struct TCP_Server_Info *server;
2985
2986         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2987                                  total_len);
2988         if (rc)
2989                 return rc;
2990
2991         server = io_parms->tcon->ses->server;
2992         if (server == NULL)
2993                 return -ECONNABORTED;
2994
2995         shdr = &req->sync_hdr;
2996         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2997
2998         req->PersistentFileId = io_parms->persistent_fid;
2999         req->VolatileFileId = io_parms->volatile_fid;
3000         req->ReadChannelInfoOffset = 0; /* reserved */
3001         req->ReadChannelInfoLength = 0; /* reserved */
3002         req->Channel = 0; /* reserved */
3003         req->MinimumCount = 0;
3004         req->Length = cpu_to_le32(io_parms->length);
3005         req->Offset = cpu_to_le64(io_parms->offset);
3006 #ifdef CONFIG_CIFS_SMB_DIRECT
3007         /*
3008          * If we want to do a RDMA write, fill in and append
3009          * smbd_buffer_descriptor_v1 to the end of read request
3010          */
3011         if (server->rdma && rdata && !server->sign &&
3012                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3013
3014                 struct smbd_buffer_descriptor_v1 *v1;
3015                 bool need_invalidate =
3016                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3017
3018                 rdata->mr = smbd_register_mr(
3019                                 server->smbd_conn, rdata->pages,
3020                                 rdata->nr_pages, rdata->page_offset,
3021                                 rdata->tailsz, true, need_invalidate);
3022                 if (!rdata->mr)
3023                         return -ENOBUFS;
3024
3025                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3026                 if (need_invalidate)
3027                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3028                 req->ReadChannelInfoOffset =
3029                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3030                 req->ReadChannelInfoLength =
3031                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3032                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3033                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3034                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3035                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3036
3037                 *total_len += sizeof(*v1) - 1;
3038         }
3039 #endif
3040         if (request_type & CHAINED_REQUEST) {
3041                 if (!(request_type & END_OF_CHAIN)) {
3042                         /* next 8-byte aligned request */
3043                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3044                         shdr->NextCommand = cpu_to_le32(*total_len);
3045                 } else /* END_OF_CHAIN */
3046                         shdr->NextCommand = 0;
3047                 if (request_type & RELATED_REQUEST) {
3048                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3049                         /*
3050                          * Related requests use info from previous read request
3051                          * in chain.
3052                          */
3053                         shdr->SessionId = 0xFFFFFFFF;
3054                         shdr->TreeId = 0xFFFFFFFF;
3055                         req->PersistentFileId = 0xFFFFFFFF;
3056                         req->VolatileFileId = 0xFFFFFFFF;
3057                 }
3058         }
3059         if (remaining_bytes > io_parms->length)
3060                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3061         else
3062                 req->RemainingBytes = 0;
3063
3064         *buf = req;
3065         return rc;
3066 }
3067
3068 static void
3069 smb2_readv_callback(struct mid_q_entry *mid)
3070 {
3071         struct cifs_readdata *rdata = mid->callback_data;
3072         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3073         struct TCP_Server_Info *server = tcon->ses->server;
3074         struct smb2_sync_hdr *shdr =
3075                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3076         unsigned int credits_received = 1;
3077         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3078                                  .rq_nvec = 2,
3079                                  .rq_pages = rdata->pages,
3080                                  .rq_offset = rdata->page_offset,
3081                                  .rq_npages = rdata->nr_pages,
3082                                  .rq_pagesz = rdata->pagesz,
3083                                  .rq_tailsz = rdata->tailsz };
3084
3085         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3086                  __func__, mid->mid, mid->mid_state, rdata->result,
3087                  rdata->bytes);
3088
3089         switch (mid->mid_state) {
3090         case MID_RESPONSE_RECEIVED:
3091                 credits_received = le16_to_cpu(shdr->CreditRequest);
3092                 /* result already set, check signature */
3093                 if (server->sign && !mid->decrypted) {
3094                         int rc;
3095
3096                         rc = smb2_verify_signature(&rqst, server);
3097                         if (rc)
3098                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3099                                          rc);
3100                 }
3101                 /* FIXME: should this be counted toward the initiating task? */
3102                 task_io_account_read(rdata->got_bytes);
3103                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3104                 break;
3105         case MID_REQUEST_SUBMITTED:
3106         case MID_RETRY_NEEDED:
3107                 rdata->result = -EAGAIN;
3108                 if (server->sign && rdata->got_bytes)
3109                         /* reset bytes number since we can not check a sign */
3110                         rdata->got_bytes = 0;
3111                 /* FIXME: should this be counted toward the initiating task? */
3112                 task_io_account_read(rdata->got_bytes);
3113                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3114                 break;
3115         default:
3116                 if (rdata->result != -ENODATA)
3117                         rdata->result = -EIO;
3118         }
3119 #ifdef CONFIG_CIFS_SMB_DIRECT
3120         /*
3121          * If this rdata has a memmory registered, the MR can be freed
3122          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3123          * because they have limited number and are used for future I/Os
3124          */
3125         if (rdata->mr) {
3126                 smbd_deregister_mr(rdata->mr);
3127                 rdata->mr = NULL;
3128         }
3129 #endif
3130         if (rdata->result)
3131                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3132
3133         queue_work(cifsiod_wq, &rdata->work);
3134         DeleteMidQEntry(mid);
3135         add_credits(server, credits_received, 0);
3136 }
3137
3138 /* smb2_async_readv - send an async read, and set up mid to handle result */
3139 int
3140 smb2_async_readv(struct cifs_readdata *rdata)
3141 {
3142         int rc, flags = 0;
3143         char *buf;
3144         struct smb2_sync_hdr *shdr;
3145         struct cifs_io_parms io_parms;
3146         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3147                                  .rq_nvec = 1 };
3148         struct TCP_Server_Info *server;
3149         unsigned int total_len;
3150
3151         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3152                  __func__, rdata->offset, rdata->bytes);
3153
3154         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3155         io_parms.offset = rdata->offset;
3156         io_parms.length = rdata->bytes;
3157         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3158         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3159         io_parms.pid = rdata->pid;
3160
3161         server = io_parms.tcon->ses->server;
3162
3163         rc = smb2_new_read_req(
3164                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3165         if (rc) {
3166                 if (rc == -EAGAIN && rdata->credits) {
3167                         /* credits was reset by reconnect */
3168                         rdata->credits = 0;
3169                         /* reduce in_flight value since we won't send the req */
3170                         spin_lock(&server->req_lock);
3171                         server->in_flight--;
3172                         spin_unlock(&server->req_lock);
3173                 }
3174                 return rc;
3175         }
3176
3177         if (smb3_encryption_required(io_parms.tcon))
3178                 flags |= CIFS_TRANSFORM_REQ;
3179
3180         rdata->iov[0].iov_base = buf;
3181         rdata->iov[0].iov_len = total_len;
3182
3183         shdr = (struct smb2_sync_hdr *)buf;
3184
3185         if (rdata->credits) {
3186                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3187                                                 SMB2_MAX_BUFFER_SIZE));
3188                 shdr->CreditRequest = shdr->CreditCharge;
3189                 spin_lock(&server->req_lock);
3190                 server->credits += rdata->credits -
3191                                                 le16_to_cpu(shdr->CreditCharge);
3192                 spin_unlock(&server->req_lock);
3193                 wake_up(&server->request_q);
3194                 flags |= CIFS_HAS_CREDITS;
3195         }
3196
3197         kref_get(&rdata->refcount);
3198         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3199                              cifs_readv_receive, smb2_readv_callback,
3200                              smb3_handle_read_data, rdata, flags);
3201         if (rc) {
3202                 kref_put(&rdata->refcount, cifs_readdata_release);
3203                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3204                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3205                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3206                                    io_parms.offset, io_parms.length);
3207         } else
3208                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3209                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3210                                    io_parms.offset, io_parms.length);
3211
3212         cifs_small_buf_release(buf);
3213         return rc;
3214 }
3215
3216 int
3217 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3218           unsigned int *nbytes, char **buf, int *buf_type)
3219 {
3220         struct smb_rqst rqst;
3221         int resp_buftype, rc = -EACCES;
3222         struct smb2_read_plain_req *req = NULL;
3223         struct smb2_read_rsp *rsp = NULL;
3224         struct kvec iov[1];
3225         struct kvec rsp_iov;
3226         unsigned int total_len;
3227         int flags = CIFS_LOG_ERROR;
3228         struct cifs_ses *ses = io_parms->tcon->ses;
3229
3230         *nbytes = 0;
3231         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3232         if (rc)
3233                 return rc;
3234
3235         if (smb3_encryption_required(io_parms->tcon))
3236                 flags |= CIFS_TRANSFORM_REQ;
3237
3238         iov[0].iov_base = (char *)req;
3239         iov[0].iov_len = total_len;
3240
3241         memset(&rqst, 0, sizeof(struct smb_rqst));
3242         rqst.rq_iov = iov;
3243         rqst.rq_nvec = 1;
3244
3245         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3246         cifs_small_buf_release(req);
3247
3248         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3249
3250         if (rc) {
3251                 if (rc != -ENODATA) {
3252                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3253                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3254                 }
3255                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3256                                     io_parms->tcon->tid, ses->Suid,
3257                                     io_parms->offset, io_parms->length);
3258                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3259                 return rc == -ENODATA ? 0 : rc;
3260         } else
3261                 trace_smb3_read_done(xid, req->PersistentFileId,
3262                                     io_parms->tcon->tid, ses->Suid,
3263                                     io_parms->offset, io_parms->length);
3264
3265         *nbytes = le32_to_cpu(rsp->DataLength);
3266         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3267             (*nbytes > io_parms->length)) {
3268                 cifs_dbg(FYI, "bad length %d for count %d\n",
3269                          *nbytes, io_parms->length);
3270                 rc = -EIO;
3271                 *nbytes = 0;
3272         }
3273
3274         if (*buf) {
3275                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3276                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3277         } else if (resp_buftype != CIFS_NO_BUFFER) {
3278                 *buf = rsp_iov.iov_base;
3279                 if (resp_buftype == CIFS_SMALL_BUFFER)
3280                         *buf_type = CIFS_SMALL_BUFFER;
3281                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3282                         *buf_type = CIFS_LARGE_BUFFER;
3283         }
3284         return rc;
3285 }
3286
3287 /*
3288  * Check the mid_state and signature on received buffer (if any), and queue the
3289  * workqueue completion task.
3290  */
3291 static void
3292 smb2_writev_callback(struct mid_q_entry *mid)
3293 {
3294         struct cifs_writedata *wdata = mid->callback_data;
3295         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3296         unsigned int written;
3297         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3298         unsigned int credits_received = 1;
3299
3300         switch (mid->mid_state) {
3301         case MID_RESPONSE_RECEIVED:
3302                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3303                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3304                 if (wdata->result != 0)
3305                         break;
3306
3307                 written = le32_to_cpu(rsp->DataLength);
3308                 /*
3309                  * Mask off high 16 bits when bytes written as returned
3310                  * by the server is greater than bytes requested by the
3311                  * client. OS/2 servers are known to set incorrect
3312                  * CountHigh values.
3313                  */
3314                 if (written > wdata->bytes)
3315                         written &= 0xFFFF;
3316
3317                 if (written < wdata->bytes)
3318                         wdata->result = -ENOSPC;
3319                 else
3320                         wdata->bytes = written;
3321                 break;
3322         case MID_REQUEST_SUBMITTED:
3323         case MID_RETRY_NEEDED:
3324                 wdata->result = -EAGAIN;
3325                 break;
3326         default:
3327                 wdata->result = -EIO;
3328                 break;
3329         }
3330 #ifdef CONFIG_CIFS_SMB_DIRECT
3331         /*
3332          * If this wdata has a memory registered, the MR can be freed
3333          * The number of MRs available is limited, it's important to recover
3334          * used MR as soon as I/O is finished. Hold MR longer in the later
3335          * I/O process can possibly result in I/O deadlock due to lack of MR
3336          * to send request on I/O retry
3337          */
3338         if (wdata->mr) {
3339                 smbd_deregister_mr(wdata->mr);
3340                 wdata->mr = NULL;
3341         }
3342 #endif
3343         if (wdata->result)
3344                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3345
3346         queue_work(cifsiod_wq, &wdata->work);
3347         DeleteMidQEntry(mid);
3348         add_credits(tcon->ses->server, credits_received, 0);
3349 }
3350
3351 /* smb2_async_writev - send an async write, and set up mid to handle result */
3352 int
3353 smb2_async_writev(struct cifs_writedata *wdata,
3354                   void (*release)(struct kref *kref))
3355 {
3356         int rc = -EACCES, flags = 0;
3357         struct smb2_write_req *req = NULL;
3358         struct smb2_sync_hdr *shdr;
3359         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3360         struct TCP_Server_Info *server = tcon->ses->server;
3361         struct kvec iov[1];
3362         struct smb_rqst rqst = { };
3363         unsigned int total_len;
3364
3365         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3366         if (rc) {
3367                 if (rc == -EAGAIN && wdata->credits) {
3368                         /* credits was reset by reconnect */
3369                         wdata->credits = 0;
3370                         /* reduce in_flight value since we won't send the req */
3371                         spin_lock(&server->req_lock);
3372                         server->in_flight--;
3373                         spin_unlock(&server->req_lock);
3374                 }
3375                 goto async_writev_out;
3376         }
3377
3378         if (smb3_encryption_required(tcon))
3379                 flags |= CIFS_TRANSFORM_REQ;
3380
3381         shdr = (struct smb2_sync_hdr *)req;
3382         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3383
3384         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3385         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3386         req->WriteChannelInfoOffset = 0;
3387         req->WriteChannelInfoLength = 0;
3388         req->Channel = 0;
3389         req->Offset = cpu_to_le64(wdata->offset);
3390         req->DataOffset = cpu_to_le16(
3391                                 offsetof(struct smb2_write_req, Buffer));
3392         req->RemainingBytes = 0;
3393 #ifdef CONFIG_CIFS_SMB_DIRECT
3394         /*
3395          * If we want to do a server RDMA read, fill in and append
3396          * smbd_buffer_descriptor_v1 to the end of write request
3397          */
3398         if (server->rdma && !server->sign && wdata->bytes >=
3399                 server->smbd_conn->rdma_readwrite_threshold) {
3400
3401                 struct smbd_buffer_descriptor_v1 *v1;
3402                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3403
3404                 wdata->mr = smbd_register_mr(
3405                                 server->smbd_conn, wdata->pages,
3406                                 wdata->nr_pages, wdata->page_offset,
3407                                 wdata->tailsz, false, need_invalidate);
3408                 if (!wdata->mr) {
3409                         rc = -ENOBUFS;
3410                         goto async_writev_out;
3411                 }
3412                 req->Length = 0;
3413                 req->DataOffset = 0;
3414                 if (wdata->nr_pages > 1)
3415                         req->RemainingBytes =
3416                                 cpu_to_le32(
3417                                         (wdata->nr_pages - 1) * wdata->pagesz -
3418                                         wdata->page_offset + wdata->tailsz
3419                                 );
3420                 else
3421                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3422                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3423                 if (need_invalidate)
3424                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3425                 req->WriteChannelInfoOffset =
3426                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3427                 req->WriteChannelInfoLength =
3428                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3429                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3430                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3431                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3432                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3433         }
3434 #endif
3435         iov[0].iov_len = total_len - 1;
3436         iov[0].iov_base = (char *)req;
3437
3438         rqst.rq_iov = iov;
3439         rqst.rq_nvec = 1;
3440         rqst.rq_pages = wdata->pages;
3441         rqst.rq_offset = wdata->page_offset;
3442         rqst.rq_npages = wdata->nr_pages;
3443         rqst.rq_pagesz = wdata->pagesz;
3444         rqst.rq_tailsz = wdata->tailsz;
3445 #ifdef CONFIG_CIFS_SMB_DIRECT
3446         if (wdata->mr) {
3447                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3448                 rqst.rq_npages = 0;
3449         }
3450 #endif
3451         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3452                  wdata->offset, wdata->bytes);
3453
3454 #ifdef CONFIG_CIFS_SMB_DIRECT
3455         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3456         if (!wdata->mr)
3457                 req->Length = cpu_to_le32(wdata->bytes);
3458 #else
3459         req->Length = cpu_to_le32(wdata->bytes);
3460 #endif
3461
3462         if (wdata->credits) {
3463                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3464                                                     SMB2_MAX_BUFFER_SIZE));
3465                 shdr->CreditRequest = shdr->CreditCharge;
3466                 spin_lock(&server->req_lock);
3467                 server->credits += wdata->credits -
3468                                                 le16_to_cpu(shdr->CreditCharge);
3469                 spin_unlock(&server->req_lock);
3470                 wake_up(&server->request_q);
3471                 flags |= CIFS_HAS_CREDITS;
3472         }
3473
3474         kref_get(&wdata->refcount);
3475         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3476                              wdata, flags);
3477
3478         if (rc) {
3479                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3480                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3481                                      wdata->bytes, rc);
3482                 kref_put(&wdata->refcount, release);
3483                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3484         } else
3485                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3486                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3487                                      wdata->bytes);
3488
3489 async_writev_out:
3490         cifs_small_buf_release(req);
3491         return rc;
3492 }
3493
3494 /*
3495  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3496  * The length field from io_parms must be at least 1 and indicates a number of
3497  * elements with data to write that begins with position 1 in iov array. All
3498  * data length is specified by count.
3499  */
3500 int
3501 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3502            unsigned int *nbytes, struct kvec *iov, int n_vec)
3503 {
3504         struct smb_rqst rqst;
3505         int rc = 0;
3506         struct smb2_write_req *req = NULL;
3507         struct smb2_write_rsp *rsp = NULL;
3508         int resp_buftype;
3509         struct kvec rsp_iov;
3510         int flags = 0;
3511         unsigned int total_len;
3512
3513         *nbytes = 0;
3514
3515         if (n_vec < 1)
3516                 return rc;
3517
3518         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3519                              &total_len);
3520         if (rc)
3521                 return rc;
3522
3523         if (io_parms->tcon->ses->server == NULL)
3524                 return -ECONNABORTED;
3525
3526         if (smb3_encryption_required(io_parms->tcon))
3527                 flags |= CIFS_TRANSFORM_REQ;
3528
3529         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3530
3531         req->PersistentFileId = io_parms->persistent_fid;
3532         req->VolatileFileId = io_parms->volatile_fid;
3533         req->WriteChannelInfoOffset = 0;
3534         req->WriteChannelInfoLength = 0;
3535         req->Channel = 0;
3536         req->Length = cpu_to_le32(io_parms->length);
3537         req->Offset = cpu_to_le64(io_parms->offset);
3538         req->DataOffset = cpu_to_le16(
3539                                 offsetof(struct smb2_write_req, Buffer));
3540         req->RemainingBytes = 0;
3541
3542         iov[0].iov_base = (char *)req;
3543         /* 1 for Buffer */
3544         iov[0].iov_len = total_len - 1;
3545
3546         memset(&rqst, 0, sizeof(struct smb_rqst));
3547         rqst.rq_iov = iov;
3548         rqst.rq_nvec = n_vec + 1;
3549
3550         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3551                             &resp_buftype, flags, &rsp_iov);
3552         cifs_small_buf_release(req);
3553         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3554
3555         if (rc) {
3556                 trace_smb3_write_err(xid, req->PersistentFileId,
3557                                      io_parms->tcon->tid,
3558                                      io_parms->tcon->ses->Suid,
3559                                      io_parms->offset, io_parms->length, rc);
3560                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3561                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3562         } else {
3563                 *nbytes = le32_to_cpu(rsp->DataLength);
3564                 trace_smb3_write_done(xid, req->PersistentFileId,
3565                                      io_parms->tcon->tid,
3566                                      io_parms->tcon->ses->Suid,
3567                                      io_parms->offset, *nbytes);
3568         }
3569
3570         free_rsp_buf(resp_buftype, rsp);
3571         return rc;
3572 }
3573
3574 static unsigned int
3575 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3576 {
3577         int len;
3578         unsigned int entrycount = 0;
3579         unsigned int next_offset = 0;
3580         FILE_DIRECTORY_INFO *entryptr;
3581
3582         if (bufstart == NULL)
3583                 return 0;
3584
3585         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3586
3587         while (1) {
3588                 entryptr = (FILE_DIRECTORY_INFO *)
3589                                         ((char *)entryptr + next_offset);
3590
3591                 if ((char *)entryptr + size > end_of_buf) {
3592                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3593                         break;
3594                 }
3595
3596                 len = le32_to_cpu(entryptr->FileNameLength);
3597                 if ((char *)entryptr + len + size > end_of_buf) {
3598                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3599                                  end_of_buf);
3600                         break;
3601                 }
3602
3603                 *lastentry = (char *)entryptr;
3604                 entrycount++;
3605
3606                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3607                 if (!next_offset)
3608                         break;
3609         }
3610
3611         return entrycount;
3612 }
3613
3614 /*
3615  * Readdir/FindFirst
3616  */
3617 int
3618 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3619                      u64 persistent_fid, u64 volatile_fid, int index,
3620                      struct cifs_search_info *srch_inf)
3621 {
3622         struct smb_rqst rqst;
3623         struct smb2_query_directory_req *req;
3624         struct smb2_query_directory_rsp *rsp = NULL;
3625         struct kvec iov[2];
3626         struct kvec rsp_iov;
3627         int rc = 0;
3628         int len;
3629         int resp_buftype = CIFS_NO_BUFFER;
3630         unsigned char *bufptr;
3631         struct TCP_Server_Info *server;
3632         struct cifs_ses *ses = tcon->ses;
3633         __le16 asteriks = cpu_to_le16('*');
3634         char *end_of_smb;
3635         unsigned int output_size = CIFSMaxBufSize;
3636         size_t info_buf_size;
3637         int flags = 0;
3638         unsigned int total_len;
3639
3640         if (ses && (ses->server))
3641                 server = ses->server;
3642         else
3643                 return -EIO;
3644
3645         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3646                              &total_len);
3647         if (rc)
3648                 return rc;
3649
3650         if (smb3_encryption_required(tcon))
3651                 flags |= CIFS_TRANSFORM_REQ;
3652
3653         switch (srch_inf->info_level) {
3654         case SMB_FIND_FILE_DIRECTORY_INFO:
3655                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3656                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3657                 break;
3658         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3659                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3660                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3661                 break;
3662         default:
3663                 cifs_dbg(VFS, "info level %u isn't supported\n",
3664                          srch_inf->info_level);
3665                 rc = -EINVAL;
3666                 goto qdir_exit;
3667         }
3668
3669         req->FileIndex = cpu_to_le32(index);
3670         req->PersistentFileId = persistent_fid;
3671         req->VolatileFileId = volatile_fid;
3672
3673         len = 0x2;
3674         bufptr = req->Buffer;
3675         memcpy(bufptr, &asteriks, len);
3676
3677         req->FileNameOffset =
3678                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3679         req->FileNameLength = cpu_to_le16(len);
3680         /*
3681          * BB could be 30 bytes or so longer if we used SMB2 specific
3682          * buffer lengths, but this is safe and close enough.
3683          */
3684         output_size = min_t(unsigned int, output_size, server->maxBuf);
3685         output_size = min_t(unsigned int, output_size, 2 << 15);
3686         req->OutputBufferLength = cpu_to_le32(output_size);
3687
3688         iov[0].iov_base = (char *)req;
3689         /* 1 for Buffer */
3690         iov[0].iov_len = total_len - 1;
3691
3692         iov[1].iov_base = (char *)(req->Buffer);
3693         iov[1].iov_len = len;
3694
3695         memset(&rqst, 0, sizeof(struct smb_rqst));
3696         rqst.rq_iov = iov;
3697         rqst.rq_nvec = 2;
3698
3699         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3700         cifs_small_buf_release(req);
3701         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3702
3703         if (rc) {
3704                 if (rc == -ENODATA &&
3705                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3706                         srch_inf->endOfSearch = true;
3707                         rc = 0;
3708                 }
3709                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3710                 goto qdir_exit;
3711         }
3712
3713         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3714                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3715                                info_buf_size);
3716         if (rc)
3717                 goto qdir_exit;
3718
3719         srch_inf->unicode = true;
3720
3721         if (srch_inf->ntwrk_buf_start) {
3722                 if (srch_inf->smallBuf)
3723                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3724                 else
3725                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3726         }
3727         srch_inf->ntwrk_buf_start = (char *)rsp;
3728         srch_inf->srch_entries_start = srch_inf->last_entry =
3729                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3730         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3731         srch_inf->entries_in_buffer =
3732                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3733                                     &srch_inf->last_entry, info_buf_size);
3734         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3735         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3736                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3737                  srch_inf->srch_entries_start, srch_inf->last_entry);
3738         if (resp_buftype == CIFS_LARGE_BUFFER)
3739                 srch_inf->smallBuf = false;
3740         else if (resp_buftype == CIFS_SMALL_BUFFER)
3741                 srch_inf->smallBuf = true;
3742         else
3743                 cifs_dbg(VFS, "illegal search buffer type\n");
3744
3745         return rc;
3746
3747 qdir_exit:
3748         free_rsp_buf(resp_buftype, rsp);
3749         return rc;
3750 }
3751
3752 static int
3753 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3754                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3755                u8 info_type, u32 additional_info, unsigned int num,
3756                 void **data, unsigned int *size)
3757 {
3758         struct smb_rqst rqst;
3759         struct smb2_set_info_req *req;
3760         struct smb2_set_info_rsp *rsp = NULL;
3761         struct kvec *iov;
3762         struct kvec rsp_iov;
3763         int rc = 0;
3764         int resp_buftype;
3765         unsigned int i;
3766         struct cifs_ses *ses = tcon->ses;
3767         int flags = 0;
3768         unsigned int total_len;
3769
3770         if (!ses || !(ses->server))
3771                 return -EIO;
3772
3773         if (!num)
3774                 return -EINVAL;
3775
3776         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3777         if (!iov)
3778                 return -ENOMEM;
3779
3780         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3781         if (rc) {
3782                 kfree(iov);
3783                 return rc;
3784         }
3785
3786         if (smb3_encryption_required(tcon))
3787                 flags |= CIFS_TRANSFORM_REQ;
3788
3789         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3790
3791         req->InfoType = info_type;
3792         req->FileInfoClass = info_class;
3793         req->PersistentFileId = persistent_fid;
3794         req->VolatileFileId = volatile_fid;
3795         req->AdditionalInformation = cpu_to_le32(additional_info);
3796
3797         req->BufferOffset =
3798                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3799         req->BufferLength = cpu_to_le32(*size);
3800
3801         memcpy(req->Buffer, *data, *size);
3802         total_len += *size;
3803
3804         iov[0].iov_base = (char *)req;
3805         /* 1 for Buffer */
3806         iov[0].iov_len = total_len - 1;
3807
3808         for (i = 1; i < num; i++) {
3809                 le32_add_cpu(&req->BufferLength, size[i]);
3810                 iov[i].iov_base = (char *)data[i];
3811                 iov[i].iov_len = size[i];
3812         }
3813
3814         memset(&rqst, 0, sizeof(struct smb_rqst));
3815         rqst.rq_iov = iov;
3816         rqst.rq_nvec = num;
3817
3818         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3819                             &rsp_iov);
3820         cifs_buf_release(req);
3821         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3822
3823         if (rc != 0) {
3824                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3825                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3826                                 ses->Suid, info_class, (__u32)info_type, rc);
3827         }
3828
3829         free_rsp_buf(resp_buftype, rsp);
3830         kfree(iov);
3831         return rc;
3832 }
3833
3834 int
3835 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3836             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3837 {
3838         struct smb2_file_rename_info info;
3839         void **data;
3840         unsigned int size[2];
3841         int rc;
3842         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3843
3844         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3845         if (!data)
3846                 return -ENOMEM;
3847
3848         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3849                               /* 0 = fail if target already exists */
3850         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3851         info.FileNameLength = cpu_to_le32(len);
3852
3853         data[0] = &info;
3854         size[0] = sizeof(struct smb2_file_rename_info);
3855
3856         data[1] = target_file;
3857         size[1] = len + 2 /* null */;
3858
3859         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3860                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3861                 0, 2, data, size);
3862         kfree(data);
3863         return rc;
3864 }
3865
3866 int
3867 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3868                   u64 persistent_fid, u64 volatile_fid)
3869 {
3870         __u8 delete_pending = 1;
3871         void *data;
3872         unsigned int size;
3873
3874         data = &delete_pending;
3875         size = 1; /* sizeof __u8 */
3876
3877         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3878                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3879                 0, 1, &data, &size);
3880 }
3881
3882 int
3883 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3884                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3885 {
3886         struct smb2_file_link_info info;
3887         void **data;
3888         unsigned int size[2];
3889         int rc;
3890         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3891
3892         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3893         if (!data)
3894                 return -ENOMEM;
3895
3896         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3897                               /* 0 = fail if link already exists */
3898         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3899         info.FileNameLength = cpu_to_le32(len);
3900
3901         data[0] = &info;
3902         size[0] = sizeof(struct smb2_file_link_info);
3903
3904         data[1] = target_file;
3905         size[1] = len + 2 /* null */;
3906
3907         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3908                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3909                         0, 2, data, size);
3910         kfree(data);
3911         return rc;
3912 }
3913
3914 int
3915 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3916              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3917 {
3918         struct smb2_file_eof_info info;
3919         void *data;
3920         unsigned int size;
3921
3922         info.EndOfFile = *eof;
3923
3924         data = &info;
3925         size = sizeof(struct smb2_file_eof_info);
3926
3927         if (is_falloc)
3928                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3929                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3930                         0, 1, &data, &size);
3931         else
3932                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3933                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3934                         0, 1, &data, &size);
3935 }
3936
3937 int
3938 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3939               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3940 {
3941         unsigned int size;
3942         size = sizeof(FILE_BASIC_INFO);
3943         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3944                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3945                 0, 1, (void **)&buf, &size);
3946 }
3947
3948 int
3949 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3950                 u64 persistent_fid, u64 volatile_fid,
3951                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3952 {
3953         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3954                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3955                         1, (void **)&pnntsd, &pacllen);
3956 }
3957
3958 int
3959 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3960             u64 persistent_fid, u64 volatile_fid,
3961             struct smb2_file_full_ea_info *buf, int len)
3962 {
3963         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3964                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3965                 0, 1, (void **)&buf, &len);
3966 }
3967
3968 int
3969 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3970                   const u64 persistent_fid, const u64 volatile_fid,
3971                   __u8 oplock_level)
3972 {
3973         struct smb_rqst rqst;
3974         int rc;
3975         struct smb2_oplock_break *req = NULL;
3976         struct cifs_ses *ses = tcon->ses;
3977         int flags = CIFS_OBREAK_OP;
3978         unsigned int total_len;
3979         struct kvec iov[1];
3980         struct kvec rsp_iov;
3981         int resp_buf_type;
3982
3983         cifs_dbg(FYI, "SMB2_oplock_break\n");
3984         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3985                              &total_len);
3986         if (rc)
3987                 return rc;
3988
3989         if (smb3_encryption_required(tcon))
3990                 flags |= CIFS_TRANSFORM_REQ;
3991
3992         req->VolatileFid = volatile_fid;
3993         req->PersistentFid = persistent_fid;
3994         req->OplockLevel = oplock_level;
3995         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3996
3997         flags |= CIFS_NO_RESP;
3998
3999         iov[0].iov_base = (char *)req;
4000         iov[0].iov_len = total_len;
4001
4002         memset(&rqst, 0, sizeof(struct smb_rqst));
4003         rqst.rq_iov = iov;
4004         rqst.rq_nvec = 1;
4005
4006         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4007         cifs_small_buf_release(req);
4008
4009         if (rc) {
4010                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4011                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4012         }
4013
4014         return rc;
4015 }
4016
4017 void
4018 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4019                              struct kstatfs *kst)
4020 {
4021         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4022                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4023         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4024         kst->f_bfree  = kst->f_bavail =
4025                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4026         return;
4027 }
4028
4029 static void
4030 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4031                         struct kstatfs *kst)
4032 {
4033         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4034         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4035         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4036         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4037                 kst->f_bavail = kst->f_bfree;
4038         else
4039                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4040         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4041                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4042         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4043                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4044
4045         return;
4046 }
4047
4048 static int
4049 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4050                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4051 {
4052         struct TCP_Server_Info *server;
4053         int rc;
4054         struct smb2_query_info_req *req;
4055         unsigned int total_len;
4056
4057         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4058
4059         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4060                 return -EIO;
4061
4062         server = tcon->ses->server;
4063
4064         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4065                              &total_len);
4066         if (rc)
4067                 return rc;
4068
4069         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4070         req->FileInfoClass = level;
4071         req->PersistentFileId = persistent_fid;
4072         req->VolatileFileId = volatile_fid;
4073         /* 1 for pad */
4074         req->InputBufferOffset =
4075                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4076         req->OutputBufferLength = cpu_to_le32(
4077                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4078
4079         iov->iov_base = (char *)req;
4080         iov->iov_len = total_len;
4081         return 0;
4082 }
4083
4084 int
4085 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4086               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4087 {
4088         struct smb_rqst rqst;
4089         struct smb2_query_info_rsp *rsp = NULL;
4090         struct kvec iov;
4091         struct kvec rsp_iov;
4092         int rc = 0;
4093         int resp_buftype;
4094         struct cifs_ses *ses = tcon->ses;
4095         FILE_SYSTEM_POSIX_INFO *info = NULL;
4096         int flags = 0;
4097
4098         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4099                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4100                                 persistent_fid, volatile_fid);
4101         if (rc)
4102                 return rc;
4103
4104         if (smb3_encryption_required(tcon))
4105                 flags |= CIFS_TRANSFORM_REQ;
4106
4107         memset(&rqst, 0, sizeof(struct smb_rqst));
4108         rqst.rq_iov = &iov;
4109         rqst.rq_nvec = 1;
4110
4111         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4112         cifs_small_buf_release(iov.iov_base);
4113         if (rc) {
4114                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4115                 goto posix_qfsinf_exit;
4116         }
4117         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4118
4119         info = (FILE_SYSTEM_POSIX_INFO *)(
4120                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4121         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4122                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4123                                sizeof(FILE_SYSTEM_POSIX_INFO));
4124         if (!rc)
4125                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4126
4127 posix_qfsinf_exit:
4128         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4129         return rc;
4130 }
4131
4132 int
4133 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4134               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4135 {
4136         struct smb_rqst rqst;
4137         struct smb2_query_info_rsp *rsp = NULL;
4138         struct kvec iov;
4139         struct kvec rsp_iov;
4140         int rc = 0;
4141         int resp_buftype;
4142         struct cifs_ses *ses = tcon->ses;
4143         struct smb2_fs_full_size_info *info = NULL;
4144         int flags = 0;
4145
4146         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4147                                 sizeof(struct smb2_fs_full_size_info),
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 qfsinf_exit;
4164         }
4165         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4166
4167         info = (struct smb2_fs_full_size_info *)(
4168                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4169         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4170                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4171                                sizeof(struct smb2_fs_full_size_info));
4172         if (!rc)
4173                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4174
4175 qfsinf_exit:
4176         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4177         return rc;
4178 }
4179
4180 int
4181 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4182               u64 persistent_fid, u64 volatile_fid, int level)
4183 {
4184         struct smb_rqst rqst;
4185         struct smb2_query_info_rsp *rsp = NULL;
4186         struct kvec iov;
4187         struct kvec rsp_iov;
4188         int rc = 0;
4189         int resp_buftype, max_len, min_len;
4190         struct cifs_ses *ses = tcon->ses;
4191         unsigned int rsp_len, offset;
4192         int flags = 0;
4193
4194         if (level == FS_DEVICE_INFORMATION) {
4195                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4196                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4197         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4198                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4199                 min_len = MIN_FS_ATTR_INFO_SIZE;
4200         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4201                 max_len = sizeof(struct smb3_fs_ss_info);
4202                 min_len = sizeof(struct smb3_fs_ss_info);
4203         } else if (level == FS_VOLUME_INFORMATION) {
4204                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4205                 min_len = sizeof(struct smb3_fs_vol_info);
4206         } else {
4207                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4208                 return -EINVAL;
4209         }
4210
4211         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4212                                 persistent_fid, volatile_fid);
4213         if (rc)
4214                 return rc;
4215
4216         if (smb3_encryption_required(tcon))
4217                 flags |= CIFS_TRANSFORM_REQ;
4218
4219         memset(&rqst, 0, sizeof(struct smb_rqst));
4220         rqst.rq_iov = &iov;
4221         rqst.rq_nvec = 1;
4222
4223         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4224         cifs_small_buf_release(iov.iov_base);
4225         if (rc) {
4226                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4227                 goto qfsattr_exit;
4228         }
4229         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4230
4231         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4232         offset = le16_to_cpu(rsp->OutputBufferOffset);
4233         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4234         if (rc)
4235                 goto qfsattr_exit;
4236
4237         if (level == FS_ATTRIBUTE_INFORMATION)
4238                 memcpy(&tcon->fsAttrInfo, offset
4239                         + (char *)rsp, min_t(unsigned int,
4240                         rsp_len, max_len));
4241         else if (level == FS_DEVICE_INFORMATION)
4242                 memcpy(&tcon->fsDevInfo, offset
4243                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4244         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4245                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4246                         (offset + (char *)rsp);
4247                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4248                 tcon->perf_sector_size =
4249                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4250         } else if (level == FS_VOLUME_INFORMATION) {
4251                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4252                         (offset + (char *)rsp);
4253                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4254                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4255         }
4256
4257 qfsattr_exit:
4258         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4259         return rc;
4260 }
4261
4262 int
4263 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4264            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4265            const __u32 num_lock, struct smb2_lock_element *buf)
4266 {
4267         struct smb_rqst rqst;
4268         int rc = 0;
4269         struct smb2_lock_req *req = NULL;
4270         struct kvec iov[2];
4271         struct kvec rsp_iov;
4272         int resp_buf_type;
4273         unsigned int count;
4274         int flags = CIFS_NO_RESP;
4275         unsigned int total_len;
4276
4277         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4278
4279         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4280         if (rc)
4281                 return rc;
4282
4283         if (smb3_encryption_required(tcon))
4284                 flags |= CIFS_TRANSFORM_REQ;
4285
4286         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4287         req->LockCount = cpu_to_le16(num_lock);
4288
4289         req->PersistentFileId = persist_fid;
4290         req->VolatileFileId = volatile_fid;
4291
4292         count = num_lock * sizeof(struct smb2_lock_element);
4293
4294         iov[0].iov_base = (char *)req;
4295         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4296         iov[1].iov_base = (char *)buf;
4297         iov[1].iov_len = count;
4298
4299         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4300
4301         memset(&rqst, 0, sizeof(struct smb_rqst));
4302         rqst.rq_iov = iov;
4303         rqst.rq_nvec = 2;
4304
4305         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4306                             &rsp_iov);
4307         cifs_small_buf_release(req);
4308         if (rc) {
4309                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4310                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4311                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4312                                     tcon->ses->Suid, rc);
4313         }
4314
4315         return rc;
4316 }
4317
4318 int
4319 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4320           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4321           const __u64 length, const __u64 offset, const __u32 lock_flags,
4322           const bool wait)
4323 {
4324         struct smb2_lock_element lock;
4325
4326         lock.Offset = cpu_to_le64(offset);
4327         lock.Length = cpu_to_le64(length);
4328         lock.Flags = cpu_to_le32(lock_flags);
4329         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4330                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4331
4332         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4333 }
4334
4335 int
4336 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4337                  __u8 *lease_key, const __le32 lease_state)
4338 {
4339         struct smb_rqst rqst;
4340         int rc;
4341         struct smb2_lease_ack *req = NULL;
4342         struct cifs_ses *ses = tcon->ses;
4343         int flags = CIFS_OBREAK_OP;
4344         unsigned int total_len;
4345         struct kvec iov[1];
4346         struct kvec rsp_iov;
4347         int resp_buf_type;
4348
4349         cifs_dbg(FYI, "SMB2_lease_break\n");
4350         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4351                              &total_len);
4352         if (rc)
4353                 return rc;
4354
4355         if (smb3_encryption_required(tcon))
4356                 flags |= CIFS_TRANSFORM_REQ;
4357
4358         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4359         req->StructureSize = cpu_to_le16(36);
4360         total_len += 12;
4361
4362         memcpy(req->LeaseKey, lease_key, 16);
4363         req->LeaseState = lease_state;
4364
4365         flags |= CIFS_NO_RESP;
4366
4367         iov[0].iov_base = (char *)req;
4368         iov[0].iov_len = total_len;
4369
4370         memset(&rqst, 0, sizeof(struct smb_rqst));
4371         rqst.rq_iov = iov;
4372         rqst.rq_nvec = 1;
4373
4374         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4375         cifs_small_buf_release(req);
4376
4377         if (rc) {
4378                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4379                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4380         }
4381
4382         return rc;
4383 }