fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53
  54 /*
  55  *  The following table defines the expected "StructureSize" of SMB2 requests
  56  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  57  *
  58  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  59  *  indexed by command in host byte order.
  60  */
  61 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  62         /* SMB2_NEGOTIATE */ 36,
  63         /* SMB2_SESSION_SETUP */ 25,
  64         /* SMB2_LOGOFF */ 4,
  65         /* SMB2_TREE_CONNECT */ 9,
  66         /* SMB2_TREE_DISCONNECT */ 4,
  67         /* SMB2_CREATE */ 57,
  68         /* SMB2_CLOSE */ 24,
  69         /* SMB2_FLUSH */ 24,
  70         /* SMB2_READ */ 49,
  71         /* SMB2_WRITE */ 49,
  72         /* SMB2_LOCK */ 48,
  73         /* SMB2_IOCTL */ 57,
  74         /* SMB2_CANCEL */ 4,
  75         /* SMB2_ECHO */ 4,
  76         /* SMB2_QUERY_DIRECTORY */ 33,
  77         /* SMB2_CHANGE_NOTIFY */ 32,
  78         /* SMB2_QUERY_INFO */ 41,
  79         /* SMB2_SET_INFO */ 33,
  80         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  81 };
  82
  83 static int smb3_encryption_required(const struct cifs_tcon *tcon)
  84 {
  85         if (!tcon)
  86                 return 0;
  87         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  88             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  89                 return 1;
  90         if (tcon->seal &&
  91             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  92                 return 1;
  93         return 0;
  94 }
  95
  96 static void
  97 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  98                   const struct cifs_tcon *tcon)
  99 {
 100         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 101         shdr->StructureSize = cpu_to_le16(64);
 102         shdr->Command = smb2_cmd;
 103         if (tcon && tcon->ses && tcon->ses->server) {
 104                 struct TCP_Server_Info *server = tcon->ses->server;
 105
 106                 spin_lock(&server->req_lock);
 107                 /* Request up to 2 credits but don't go over the limit. */
 108                 if (server->credits >= server->max_credits)
 109                         shdr->CreditRequest = cpu_to_le16(0);
 110                 else
 111                         shdr->CreditRequest = cpu_to_le16(
 112                                 min_t(int, server->max_credits -
 113                                                 server->credits, 2));
 114                 spin_unlock(&server->req_lock);
 115         } else {
 116                 shdr->CreditRequest = cpu_to_le16(2);
 117         }
 118         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 119
 120         if (!tcon)
 121                 goto out;
 122
 123         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 124         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 125         if ((tcon->ses) && (tcon->ses->server) &&
 126             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 127                 shdr->CreditCharge = cpu_to_le16(1);
 128         /* else CreditCharge MBZ */
 129
 130         shdr->TreeId = tcon->tid;
 131         /* Uid is not converted */
 132         if (tcon->ses)
 133                 shdr->SessionId = tcon->ses->Suid;
 134
 135         /*
 136          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 137          * to pass the path on the Open SMB prefixed by \\server\share.
 138          * Not sure when we would need to do the augmented path (if ever) and
 139          * setting this flag breaks the SMB2 open operation since it is
 140          * illegal to send an empty path name (without \\server\share prefix)
 141          * when the DFS flag is set in the SMB open header. We could
 142          * consider setting the flag on all operations other than open
 143          * but it is safer to net set it for now.
 144          */
 145 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 146                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 147
 148         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 149             !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 157 {
 158         int rc = 0;
 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 rc;
 170
 171         if (smb2_command == SMB2_TREE_CONNECT)
 172                 return rc;
 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                 wait_event_interruptible_timeout(server->response_q,
 216                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 217
 218                 /* are we still trying to reconnect? */
 219                 if (server->tcpStatus != CifsNeedReconnect)
 220                         break;
 221
 222                 /*
 223                  * on "soft" mounts we wait once. Hard mounts keep
 224                  * retrying until process is killed or server comes
 225                  * back on-line
 226                  */
 227                 if (!tcon->retry) {
 228                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 229                         return -EHOSTDOWN;
 230                 }
 231         }
 232
 233         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 234                 return rc;
 235
 236         nls_codepage = load_nls_default();
 237
 238         /*
 239          * need to prevent multiple threads trying to simultaneously reconnect
 240          * the same SMB session
 241          */
 242         mutex_lock(&tcon->ses->session_mutex);
 243
 244         /*
 245          * Recheck after acquire mutex. If another thread is negotiating
 246          * and the server never sends an answer the socket will be closed
 247          * and tcpStatus set to reconnect.
 248          */
 249         if (server->tcpStatus == CifsNeedReconnect) {
 250                 rc = -EHOSTDOWN;
 251                 mutex_unlock(&tcon->ses->session_mutex);
 252                 goto out;
 253         }
 254
 255         rc = cifs_negotiate_protocol(0, tcon->ses);
 256         if (!rc && tcon->ses->need_reconnect)
 257                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 258
 259         if (rc || !tcon->need_reconnect) {
 260                 mutex_unlock(&tcon->ses->session_mutex);
 261                 goto out;
 262         }
 263
 264         cifs_mark_open_files_invalid(tcon);
 265         if (tcon->use_persistent)
 266                 tcon->need_reopen_files = true;
 267
 268         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 269         mutex_unlock(&tcon->ses->session_mutex);
 270
 271         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 272         if (rc) {
 273                 /* If sess reconnected but tcon didn't, something strange ... */
 274                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 275                 goto out;
 276         }
 277
 278         if (smb2_command != SMB2_INTERNAL_CMD)
 279                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 280
 281         atomic_inc(&tconInfoReconnectCount);
 282 out:
 283         /*
 284          * Check if handle based operation so we know whether we can continue
 285          * or not without returning to caller to reset file handle.
 286          */
 287         /*
 288          * BB Is flush done by server on drop of tcp session? Should we special
 289          * case it and skip above?
 290          */
 291         switch (smb2_command) {
 292         case SMB2_FLUSH:
 293         case SMB2_READ:
 294         case SMB2_WRITE:
 295         case SMB2_LOCK:
 296         case SMB2_IOCTL:
 297         case SMB2_QUERY_DIRECTORY:
 298         case SMB2_CHANGE_NOTIFY:
 299         case SMB2_QUERY_INFO:
 300         case SMB2_SET_INFO:
 301                 rc = -EAGAIN;
 302         }
 303         unload_nls(nls_codepage);
 304         return rc;
 305 }
 306
 307 static void
 308 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 309                unsigned int *total_len)
 310 {
 311         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 312         /* lookup word count ie StructureSize from table */
 313         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 314
 315         /*
 316          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 317          * largest operations (Create)
 318          */
 319         memset(buf, 0, 256);
 320
 321         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 322         spdu->StructureSize2 = cpu_to_le16(parmsize);
 323
 324         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 325 }
 326
 327 /*
 328  * Allocate and return pointer to an SMB request hdr, and set basic
 329  * SMB information in the SMB header. If the return code is zero, this
 330  * function must have filled in request_buf pointer.
 331  */
 332 static int
 333 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 334                     void **request_buf, unsigned int *total_len)
 335 {
 336         int rc;
 337
 338         rc = smb2_reconnect(smb2_command, tcon);
 339         if (rc)
 340                 return rc;
 341
 342         /* BB eventually switch this to SMB2 specific small buf size */
 343         *request_buf = cifs_small_buf_get();
 344         if (*request_buf == NULL) {
 345                 /* BB should we add a retry in here if not a writepage? */
 346                 return -ENOMEM;
 347         }
 348
 349         fill_small_buf(smb2_command, tcon,
 350                        (struct smb2_sync_hdr *)(*request_buf),
 351                        total_len);
 352
 353         if (tcon != NULL) {
 354 #ifdef CONFIG_CIFS_STATS2
 355                 uint16_t com_code = le16_to_cpu(smb2_command);
 356                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 357 #endif
 358                 cifs_stats_inc(&tcon->num_smbs_sent);
 359         }
 360
 361         return rc;
 362 }
 363
 364 #ifdef CONFIG_CIFS_SMB311
 365 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 366 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 367
 368
 369 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 370 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 371 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 372
 373 static void
 374 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 375 {
 376         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 377         pneg_ctxt->DataLength = cpu_to_le16(38);
 378         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 379         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 380         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 381         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 382 }
 383
 384 static void
 385 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 386 {
 387         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 388         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 389         pneg_ctxt->CipherCount = cpu_to_le16(1);
 390 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 391         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 392 }
 393
 394 static void
 395 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 396 {
 397         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 398         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 399 }
 400
 401 static void
 402 assemble_neg_contexts(struct smb2_negotiate_req *req,
 403                       unsigned int *total_len)
 404 {
 405         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 406         unsigned int ctxt_len;
 407
 408         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 409         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 410         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 411         *total_len += ctxt_len;
 412         pneg_ctxt += ctxt_len;
 413
 414         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 415         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 416         *total_len += ctxt_len;
 417         pneg_ctxt += ctxt_len;
 418
 419         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 420         *total_len += sizeof(struct smb2_posix_neg_context);
 421
 422         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 423         req->NegotiateContextCount = cpu_to_le16(3);
 424 }
 425
 426 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 427 {
 428         unsigned int len = le16_to_cpu(ctxt->DataLength);
 429
 430         /* If invalid preauth context warn but use what we requested, SHA-512 */
 431         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 432                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 433                 return;
 434         }
 435         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 436                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 437         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 438                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 439 }
 440
 441 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 442                               struct smb2_encryption_neg_context *ctxt)
 443 {
 444         unsigned int len = le16_to_cpu(ctxt->DataLength);
 445
 446         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 447         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 448                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 449                 return -EINVAL;
 450         }
 451
 452         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 453                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 454                 return -EINVAL;
 455         }
 456         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 457         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 458             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 459                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 460                 return -EINVAL;
 461         }
 462         server->cipher_type = ctxt->Ciphers[0];
 463         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 464         return 0;
 465 }
 466
 467 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 468                                      struct TCP_Server_Info *server,
 469                                      unsigned int len_of_smb)
 470 {
 471         struct smb2_neg_context *pctx;
 472         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 473         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 474         unsigned int len_of_ctxts, i;
 475         int rc = 0;
 476
 477         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 478         if (len_of_smb <= offset) {
 479                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 480                 return -EINVAL;
 481         }
 482
 483         len_of_ctxts = len_of_smb - offset;
 484
 485         for (i = 0; i < ctxt_cnt; i++) {
 486                 int clen;
 487                 /* check that offset is not beyond end of SMB */
 488                 if (len_of_ctxts == 0)
 489                         break;
 490
 491                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 492                         break;
 493
 494                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 495                 clen = le16_to_cpu(pctx->DataLength);
 496                 if (clen > len_of_ctxts)
 497                         break;
 498
 499                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 500                         decode_preauth_context(
 501                                 (struct smb2_preauth_neg_context *)pctx);
 502                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 503                         rc = decode_encrypt_ctx(server,
 504                                 (struct smb2_encryption_neg_context *)pctx);
 505                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 506                         server->posix_ext_supported = true;
 507                 else
 508                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 509                                 le16_to_cpu(pctx->ContextType));
 510
 511                 if (rc)
 512                         break;
 513                 /* offsets must be 8 byte aligned */
 514                 clen = (clen + 7) & ~0x7;
 515                 offset += clen + sizeof(struct smb2_neg_context);
 516                 len_of_ctxts -= clen;
 517         }
 518         return rc;
 519 }
 520
 521 static struct create_posix *
 522 create_posix_buf(umode_t mode)
 523 {
 524         struct create_posix *buf;
 525
 526         buf = kzalloc(sizeof(struct create_posix),
 527                         GFP_KERNEL);
 528         if (!buf)
 529                 return NULL;
 530
 531         buf->ccontext.DataOffset =
 532                 cpu_to_le16(offsetof(struct create_posix, Mode));
 533         buf->ccontext.DataLength = cpu_to_le32(4);
 534         buf->ccontext.NameOffset =
 535                 cpu_to_le16(offsetof(struct create_posix, Name));
 536         buf->ccontext.NameLength = cpu_to_le16(16);
 537
 538         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 539         buf->Name[0] = 0x93;
 540         buf->Name[1] = 0xAD;
 541         buf->Name[2] = 0x25;
 542         buf->Name[3] = 0x50;
 543         buf->Name[4] = 0x9C;
 544         buf->Name[5] = 0xB4;
 545         buf->Name[6] = 0x11;
 546         buf->Name[7] = 0xE7;
 547         buf->Name[8] = 0xB4;
 548         buf->Name[9] = 0x23;
 549         buf->Name[10] = 0x83;
 550         buf->Name[11] = 0xDE;
 551         buf->Name[12] = 0x96;
 552         buf->Name[13] = 0x8B;
 553         buf->Name[14] = 0xCD;
 554         buf->Name[15] = 0x7C;
 555         buf->Mode = cpu_to_le32(mode);
 556         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 557         return buf;
 558 }
 559
 560 static int
 561 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 562 {
 563         struct smb2_create_req *req = iov[0].iov_base;
 564         unsigned int num = *num_iovec;
 565
 566         iov[num].iov_base = create_posix_buf(mode);
 567         if (iov[num].iov_base == NULL)
 568                 return -ENOMEM;
 569         iov[num].iov_len = sizeof(struct create_posix);
 570         if (!req->CreateContextsOffset)
 571                 req->CreateContextsOffset = cpu_to_le32(
 572                                 sizeof(struct smb2_create_req) +
 573                                 iov[num - 1].iov_len);
 574         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 575         *num_iovec = num + 1;
 576         return 0;
 577 }
 578
 579 #else
 580 static void assemble_neg_contexts(struct smb2_negotiate_req *req,
 581                                   unsigned int *total_len)
 582 {
 583         return;
 584 }
 585 #endif /* SMB311 */
 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 smb2_negotiate_req *req;
 606         struct smb2_negotiate_rsp *rsp;
 607         struct kvec iov[1];
 608         struct kvec rsp_iov;
 609         int rc = 0;
 610         int resp_buftype;
 611         struct TCP_Server_Info *server = ses->server;
 612         int blob_offset, blob_length;
 613         char *security_blob;
 614         int flags = CIFS_NEG_OP;
 615         unsigned int total_len;
 616
 617         cifs_dbg(FYI, "Negotiate protocol\n");
 618
 619         if (!server) {
 620                 WARN(1, "%s: server is NULL!\n", __func__);
 621                 return -EIO;
 622         }
 623
 624         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 625         if (rc)
 626                 return rc;
 627
 628         req->sync_hdr.SessionId = 0;
 629 #ifdef CONFIG_CIFS_SMB311
 630         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 631         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 632 #endif
 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         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
 677         cifs_small_buf_release(req);
 678         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 679         /*
 680          * No tcon so can't do
 681          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 682          */
 683         if (rc == -EOPNOTSUPP) {
 684                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 685                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 686                         " older servers\n");
 687                 goto neg_exit;
 688         } else if (rc != 0)
 689                 goto neg_exit;
 690
 691         if (strcmp(ses->server->vals->version_string,
 692                    SMB3ANY_VERSION_STRING) == 0) {
 693                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 694                         cifs_dbg(VFS,
 695                                 "SMB2 dialect returned but not requested\n");
 696                         return -EIO;
 697                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 698                         cifs_dbg(VFS,
 699                                 "SMB2.1 dialect returned but not requested\n");
 700                         return -EIO;
 701                 }
 702         } else if (strcmp(ses->server->vals->version_string,
 703                    SMBDEFAULT_VERSION_STRING) == 0) {
 704                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 705                         cifs_dbg(VFS,
 706                                 "SMB2 dialect returned but not requested\n");
 707                         return -EIO;
 708                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 709                         /* ops set to 3.0 by default for default so update */
 710                         ses->server->ops = &smb21_operations;
 711                 }
 712         } else if (le16_to_cpu(rsp->DialectRevision) !=
 713                                 ses->server->vals->protocol_id) {
 714                 /* if requested single dialect ensure returned dialect matched */
 715                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 716                         le16_to_cpu(rsp->DialectRevision));
 717                 return -EIO;
 718         }
 719
 720         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 721
 722         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 723                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 724         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 725                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 726         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 727                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 728         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 729                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 730 #ifdef CONFIG_CIFS_SMB311
 731         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 732                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 733 #endif /* SMB311 */
 734         else {
 735                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 736                          le16_to_cpu(rsp->DialectRevision));
 737                 rc = -EIO;
 738                 goto neg_exit;
 739         }
 740         server->dialect = le16_to_cpu(rsp->DialectRevision);
 741
 742         /* BB: add check that dialect was valid given dialect(s) we asked for */
 743
 744 #ifdef CONFIG_CIFS_SMB311
 745         /*
 746          * Keep a copy of the hash after negprot. This hash will be
 747          * the starting hash value for all sessions made from this
 748          * server.
 749          */
 750         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 751                SMB2_PREAUTH_HASH_SIZE);
 752 #endif
 753         /* SMB2 only has an extended negflavor */
 754         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 755         /* set it to the maximum buffer size value we can send with 1 credit */
 756         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 757                                SMB2_MAX_BUFFER_SIZE);
 758         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 759         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 760         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 761         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 762                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 763                                 server->sec_mode);
 764         server->capabilities = le32_to_cpu(rsp->Capabilities);
 765         /* Internal types */
 766         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 767
 768         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 769                                                (struct smb2_sync_hdr *)rsp);
 770         /*
 771          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 772          * for us will be
 773          *      ses->sectype = RawNTLMSSP;
 774          * but for time being this is our only auth choice so doesn't matter.
 775          * We just found a server which sets blob length to zero expecting raw.
 776          */
 777         if (blob_length == 0) {
 778                 cifs_dbg(FYI, "missing security blob on negprot\n");
 779                 server->sec_ntlmssp = true;
 780         }
 781
 782         rc = cifs_enable_signing(server, ses->sign);
 783         if (rc)
 784                 goto neg_exit;
 785         if (blob_length) {
 786                 rc = decode_negTokenInit(security_blob, blob_length, server);
 787                 if (rc == 1)
 788                         rc = 0;
 789                 else if (rc == 0)
 790                         rc = -EIO;
 791         }
 792
 793 #ifdef CONFIG_CIFS_SMB311
 794         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 795                 if (rsp->NegotiateContextCount)
 796                         rc = smb311_decode_neg_context(rsp, server,
 797                                                        rsp_iov.iov_len);
 798                 else
 799                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 800         }
 801 #endif /* CONFIG_CIFS_SMB311 */
 802 neg_exit:
 803         free_rsp_buf(resp_buftype, rsp);
 804         return rc;
 805 }
 806
 807 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 808 {
 809         int rc;
 810         struct validate_negotiate_info_req *pneg_inbuf;
 811         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 812         u32 rsplen;
 813         u32 inbuflen; /* max of 4 dialects */
 814
 815         cifs_dbg(FYI, "validate negotiate\n");
 816
 817         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 818         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 819                 return 0;
 820
 821         /*
 822          * validation ioctl must be signed, so no point sending this if we
 823          * can not sign it (ie are not known user).  Even if signing is not
 824          * required (enabled but not negotiated), in those cases we selectively
 825          * sign just this, the first and only signed request on a connection.
 826          * Having validation of negotiate info  helps reduce attack vectors.
 827          */
 828         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 829                 return 0; /* validation requires signing */
 830
 831         if (tcon->ses->user_name == NULL) {
 832                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 833                 return 0; /* validation requires signing */
 834         }
 835
 836         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 837                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 838
 839         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 840         if (!pneg_inbuf)
 841                 return -ENOMEM;
 842
 843         pneg_inbuf->Capabilities =
 844                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 845         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 846                                         SMB2_CLIENT_GUID_SIZE);
 847
 848         if (tcon->ses->sign)
 849                 pneg_inbuf->SecurityMode =
 850                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 851         else if (global_secflags & CIFSSEC_MAY_SIGN)
 852                 pneg_inbuf->SecurityMode =
 853                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 854         else
 855                 pneg_inbuf->SecurityMode = 0;
 856
 857
 858         if (strcmp(tcon->ses->server->vals->version_string,
 859                 SMB3ANY_VERSION_STRING) == 0) {
 860                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 861                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 862                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 863                 /* structure is big enough for 3 dialects, sending only 2 */
 864                 inbuflen = sizeof(*pneg_inbuf) -
 865                                 sizeof(pneg_inbuf->Dialects[0]);
 866         } else if (strcmp(tcon->ses->server->vals->version_string,
 867                 SMBDEFAULT_VERSION_STRING) == 0) {
 868                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 869                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 870                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 871                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 872                 /* structure is big enough for 3 dialects */
 873                 inbuflen = sizeof(*pneg_inbuf);
 874         } else {
 875                 /* otherwise specific dialect was requested */
 876                 pneg_inbuf->Dialects[0] =
 877                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 878                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 879                 /* structure is big enough for 3 dialects, sending only 1 */
 880                 inbuflen = sizeof(*pneg_inbuf) -
 881                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 882         }
 883
 884         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 885                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 886                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 887
 888         if (rc != 0) {
 889                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 890                 rc = -EIO;
 891                 goto out_free_inbuf;
 892         }
 893
 894         rc = -EIO;
 895         if (rsplen != sizeof(*pneg_rsp)) {
 896                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 897                          rsplen);
 898
 899                 /* relax check since Mac returns max bufsize allowed on ioctl */
 900                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 901                         goto out_free_rsp;
 902         }
 903
 904         /* check validate negotiate info response matches what we got earlier */
 905         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 906                 goto vneg_out;
 907
 908         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 909                 goto vneg_out;
 910
 911         /* do not validate server guid because not saved at negprot time yet */
 912
 913         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 914               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 915                 goto vneg_out;
 916
 917         /* validate negotiate successful */
 918         rc = 0;
 919         cifs_dbg(FYI, "validate negotiate info successful\n");
 920         goto out_free_rsp;
 921
 922 vneg_out:
 923         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 924 out_free_rsp:
 925         kfree(pneg_rsp);
 926 out_free_inbuf:
 927         kfree(pneg_inbuf);
 928         return rc;
 929 }
 930
 931 enum securityEnum
 932 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 933 {
 934         switch (requested) {
 935         case Kerberos:
 936         case RawNTLMSSP:
 937                 return requested;
 938         case NTLMv2:
 939                 return RawNTLMSSP;
 940         case Unspecified:
 941                 if (server->sec_ntlmssp &&
 942                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 943                         return RawNTLMSSP;
 944                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 945                         (global_secflags & CIFSSEC_MAY_KRB5))
 946                         return Kerberos;
 947                 /* Fallthrough */
 948         default:
 949                 return Unspecified;
 950         }
 951 }
 952
 953 struct SMB2_sess_data {
 954         unsigned int xid;
 955         struct cifs_ses *ses;
 956         struct nls_table *nls_cp;
 957         void (*func)(struct SMB2_sess_data *);
 958         int result;
 959         u64 previous_session;
 960
 961         /* we will send the SMB in three pieces:
 962          * a fixed length beginning part, an optional
 963          * SPNEGO blob (which can be zero length), and a
 964          * last part which will include the strings
 965          * and rest of bcc area. This allows us to avoid
 966          * a large buffer 17K allocation
 967          */
 968         int buf0_type;
 969         struct kvec iov[2];
 970 };
 971
 972 static int
 973 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 974 {
 975         int rc;
 976         struct cifs_ses *ses = sess_data->ses;
 977         struct smb2_sess_setup_req *req;
 978         struct TCP_Server_Info *server = ses->server;
 979         unsigned int total_len;
 980
 981         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 982                              &total_len);
 983         if (rc)
 984                 return rc;
 985
 986         /* First session, not a reauthenticate */
 987         req->sync_hdr.SessionId = 0;
 988
 989         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 990         req->PreviousSessionId = sess_data->previous_session;
 991
 992         req->Flags = 0; /* MBZ */
 993         /* to enable echos and oplocks */
 994         req->sync_hdr.CreditRequest = cpu_to_le16(3);
 995
 996         /* only one of SMB2 signing flags may be set in SMB2 request */
 997         if (server->sign)
 998                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 999         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1000                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1001         else
1002                 req->SecurityMode = 0;
1003
1004         req->Capabilities = 0;
1005         req->Channel = 0; /* MBZ */
1006
1007         sess_data->iov[0].iov_base = (char *)req;
1008         /* 1 for pad */
1009         sess_data->iov[0].iov_len = total_len - 1;
1010         /*
1011          * This variable will be used to clear the buffer
1012          * allocated above in case of any error in the calling function.
1013          */
1014         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1015
1016         return 0;
1017 }
1018
1019 static void
1020 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1021 {
1022         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1023         sess_data->buf0_type = CIFS_NO_BUFFER;
1024 }
1025
1026 static int
1027 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1028 {
1029         int rc;
1030         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1031         struct kvec rsp_iov = { NULL, 0 };
1032
1033         /* Testing shows that buffer offset must be at location of Buffer[0] */
1034         req->SecurityBufferOffset =
1035                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1036         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1037
1038         /* BB add code to build os and lm fields */
1039
1040         rc = smb2_send_recv(sess_data->xid, sess_data->ses,
1041                             sess_data->iov, 2,
1042                             &sess_data->buf0_type,
1043                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1044         cifs_small_buf_release(sess_data->iov[0].iov_base);
1045         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1046
1047         return rc;
1048 }
1049
1050 static int
1051 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1052 {
1053         int rc = 0;
1054         struct cifs_ses *ses = sess_data->ses;
1055
1056         mutex_lock(&ses->server->srv_mutex);
1057         if (ses->server->ops->generate_signingkey) {
1058                 rc = ses->server->ops->generate_signingkey(ses);
1059                 if (rc) {
1060                         cifs_dbg(FYI,
1061                                 "SMB3 session key generation failed\n");
1062                         mutex_unlock(&ses->server->srv_mutex);
1063                         return rc;
1064                 }
1065         }
1066         if (!ses->server->session_estab) {
1067                 ses->server->sequence_number = 0x2;
1068                 ses->server->session_estab = true;
1069         }
1070         mutex_unlock(&ses->server->srv_mutex);
1071
1072         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1073         spin_lock(&GlobalMid_Lock);
1074         ses->status = CifsGood;
1075         ses->need_reconnect = false;
1076         spin_unlock(&GlobalMid_Lock);
1077         return rc;
1078 }
1079
1080 #ifdef CONFIG_CIFS_UPCALL
1081 static void
1082 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1083 {
1084         int rc;
1085         struct cifs_ses *ses = sess_data->ses;
1086         struct cifs_spnego_msg *msg;
1087         struct key *spnego_key = NULL;
1088         struct smb2_sess_setup_rsp *rsp = NULL;
1089
1090         rc = SMB2_sess_alloc_buffer(sess_data);
1091         if (rc)
1092                 goto out;
1093
1094         spnego_key = cifs_get_spnego_key(ses);
1095         if (IS_ERR(spnego_key)) {
1096                 rc = PTR_ERR(spnego_key);
1097                 spnego_key = NULL;
1098                 goto out;
1099         }
1100
1101         msg = spnego_key->payload.data[0];
1102         /*
1103          * check version field to make sure that cifs.upcall is
1104          * sending us a response in an expected form
1105          */
1106         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1107                 cifs_dbg(VFS,
1108                           "bad cifs.upcall version. Expected %d got %d",
1109                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1110                 rc = -EKEYREJECTED;
1111                 goto out_put_spnego_key;
1112         }
1113
1114         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1115                                          GFP_KERNEL);
1116         if (!ses->auth_key.response) {
1117                 cifs_dbg(VFS,
1118                         "Kerberos can't allocate (%u bytes) memory",
1119                         msg->sesskey_len);
1120                 rc = -ENOMEM;
1121                 goto out_put_spnego_key;
1122         }
1123         ses->auth_key.len = msg->sesskey_len;
1124
1125         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1126         sess_data->iov[1].iov_len = msg->secblob_len;
1127
1128         rc = SMB2_sess_sendreceive(sess_data);
1129         if (rc)
1130                 goto out_put_spnego_key;
1131
1132         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1133         ses->Suid = rsp->sync_hdr.SessionId;
1134
1135         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1136
1137         rc = SMB2_sess_establish_session(sess_data);
1138 out_put_spnego_key:
1139         key_invalidate(spnego_key);
1140         key_put(spnego_key);
1141 out:
1142         sess_data->result = rc;
1143         sess_data->func = NULL;
1144         SMB2_sess_free_buffer(sess_data);
1145 }
1146 #else
1147 static void
1148 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1149 {
1150         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1151         sess_data->result = -EOPNOTSUPP;
1152         sess_data->func = NULL;
1153 }
1154 #endif
1155
1156 static void
1157 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1158
1159 static void
1160 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1161 {
1162         int rc;
1163         struct cifs_ses *ses = sess_data->ses;
1164         struct smb2_sess_setup_rsp *rsp = NULL;
1165         char *ntlmssp_blob = NULL;
1166         bool use_spnego = false; /* else use raw ntlmssp */
1167         u16 blob_length = 0;
1168
1169         /*
1170          * If memory allocation is successful, caller of this function
1171          * frees it.
1172          */
1173         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1174         if (!ses->ntlmssp) {
1175                 rc = -ENOMEM;
1176                 goto out_err;
1177         }
1178         ses->ntlmssp->sesskey_per_smbsess = true;
1179
1180         rc = SMB2_sess_alloc_buffer(sess_data);
1181         if (rc)
1182                 goto out_err;
1183
1184         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1185                                GFP_KERNEL);
1186         if (ntlmssp_blob == NULL) {
1187                 rc = -ENOMEM;
1188                 goto out;
1189         }
1190
1191         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1192         if (use_spnego) {
1193                 /* BB eventually need to add this */
1194                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1195                 rc = -EOPNOTSUPP;
1196                 goto out;
1197         } else {
1198                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1199                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1200         }
1201         sess_data->iov[1].iov_base = ntlmssp_blob;
1202         sess_data->iov[1].iov_len = blob_length;
1203
1204         rc = SMB2_sess_sendreceive(sess_data);
1205         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1206
1207         /* If true, rc here is expected and not an error */
1208         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1209                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1210                 rc = 0;
1211
1212         if (rc)
1213                 goto out;
1214
1215         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1216                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1217                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1218                         le16_to_cpu(rsp->SecurityBufferOffset));
1219                 rc = -EIO;
1220                 goto out;
1221         }
1222         rc = decode_ntlmssp_challenge(rsp->Buffer,
1223                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1224         if (rc)
1225                 goto out;
1226
1227         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1228
1229
1230         ses->Suid = rsp->sync_hdr.SessionId;
1231         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1232
1233 out:
1234         kfree(ntlmssp_blob);
1235         SMB2_sess_free_buffer(sess_data);
1236         if (!rc) {
1237                 sess_data->result = 0;
1238                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1239                 return;
1240         }
1241 out_err:
1242         kfree(ses->ntlmssp);
1243         ses->ntlmssp = NULL;
1244         sess_data->result = rc;
1245         sess_data->func = NULL;
1246 }
1247
1248 static void
1249 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1250 {
1251         int rc;
1252         struct cifs_ses *ses = sess_data->ses;
1253         struct smb2_sess_setup_req *req;
1254         struct smb2_sess_setup_rsp *rsp = NULL;
1255         unsigned char *ntlmssp_blob = NULL;
1256         bool use_spnego = false; /* else use raw ntlmssp */
1257         u16 blob_length = 0;
1258
1259         rc = SMB2_sess_alloc_buffer(sess_data);
1260         if (rc)
1261                 goto out;
1262
1263         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1264         req->sync_hdr.SessionId = ses->Suid;
1265
1266         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1267                                         sess_data->nls_cp);
1268         if (rc) {
1269                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1270                 goto out;
1271         }
1272
1273         if (use_spnego) {
1274                 /* BB eventually need to add this */
1275                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1276                 rc = -EOPNOTSUPP;
1277                 goto out;
1278         }
1279         sess_data->iov[1].iov_base = ntlmssp_blob;
1280         sess_data->iov[1].iov_len = blob_length;
1281
1282         rc = SMB2_sess_sendreceive(sess_data);
1283         if (rc)
1284                 goto out;
1285
1286         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1287
1288         ses->Suid = rsp->sync_hdr.SessionId;
1289         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1290
1291         rc = SMB2_sess_establish_session(sess_data);
1292 out:
1293         kfree(ntlmssp_blob);
1294         SMB2_sess_free_buffer(sess_data);
1295         kfree(ses->ntlmssp);
1296         ses->ntlmssp = NULL;
1297         sess_data->result = rc;
1298         sess_data->func = NULL;
1299 }
1300
1301 static int
1302 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1303 {
1304         int type;
1305
1306         type = smb2_select_sectype(ses->server, ses->sectype);
1307         cifs_dbg(FYI, "sess setup type %d\n", type);
1308         if (type == Unspecified) {
1309                 cifs_dbg(VFS,
1310                         "Unable to select appropriate authentication method!");
1311                 return -EINVAL;
1312         }
1313
1314         switch (type) {
1315         case Kerberos:
1316                 sess_data->func = SMB2_auth_kerberos;
1317                 break;
1318         case RawNTLMSSP:
1319                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1320                 break;
1321         default:
1322                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1323                 return -EOPNOTSUPP;
1324         }
1325
1326         return 0;
1327 }
1328
1329 int
1330 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1331                 const struct nls_table *nls_cp)
1332 {
1333         int rc = 0;
1334         struct TCP_Server_Info *server = ses->server;
1335         struct SMB2_sess_data *sess_data;
1336
1337         cifs_dbg(FYI, "Session Setup\n");
1338
1339         if (!server) {
1340                 WARN(1, "%s: server is NULL!\n", __func__);
1341                 return -EIO;
1342         }
1343
1344         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1345         if (!sess_data)
1346                 return -ENOMEM;
1347
1348         rc = SMB2_select_sec(ses, sess_data);
1349         if (rc)
1350                 goto out;
1351         sess_data->xid = xid;
1352         sess_data->ses = ses;
1353         sess_data->buf0_type = CIFS_NO_BUFFER;
1354         sess_data->nls_cp = (struct nls_table *) nls_cp;
1355         sess_data->previous_session = ses->Suid;
1356
1357 #ifdef CONFIG_CIFS_SMB311
1358         /*
1359          * Initialize the session hash with the server one.
1360          */
1361         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1362                SMB2_PREAUTH_HASH_SIZE);
1363 #endif
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 smb2_logoff_req *req; /* response is also trivial struct */
1380         int rc = 0;
1381         struct TCP_Server_Info *server;
1382         int flags = 0;
1383         unsigned int total_len;
1384         struct kvec iov[1];
1385         struct kvec rsp_iov;
1386         int resp_buf_type;
1387
1388         cifs_dbg(FYI, "disconnect session %p\n", ses);
1389
1390         if (ses && (ses->server))
1391                 server = ses->server;
1392         else
1393                 return -EIO;
1394
1395         /* no need to send SMB logoff if uid already closed due to reconnect */
1396         if (ses->need_reconnect)
1397                 goto smb2_session_already_dead;
1398
1399         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1400         if (rc)
1401                 return rc;
1402
1403          /* since no tcon, smb2_init can not do this, so do here */
1404         req->sync_hdr.SessionId = ses->Suid;
1405
1406         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1407                 flags |= CIFS_TRANSFORM_REQ;
1408         else if (server->sign)
1409                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1410
1411         flags |= CIFS_NO_RESP;
1412
1413         iov[0].iov_base = (char *)req;
1414         iov[0].iov_len = total_len;
1415
1416         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1417         cifs_small_buf_release(req);
1418         /*
1419          * No tcon so can't do
1420          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1421          */
1422
1423 smb2_session_already_dead:
1424         return rc;
1425 }
1426
1427 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1428 {
1429         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1430 }
1431
1432 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1433
1434 /* These are similar values to what Windows uses */
1435 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1436 {
1437         tcon->max_chunks = 256;
1438         tcon->max_bytes_chunk = 1048576;
1439         tcon->max_bytes_copy = 16777216;
1440 }
1441
1442 int
1443 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1444           struct cifs_tcon *tcon, const struct nls_table *cp)
1445 {
1446         struct smb2_tree_connect_req *req;
1447         struct smb2_tree_connect_rsp *rsp = NULL;
1448         struct kvec iov[2];
1449         struct kvec rsp_iov = { NULL, 0 };
1450         int rc = 0;
1451         int resp_buftype;
1452         int unc_path_len;
1453         __le16 *unc_path = NULL;
1454         int flags = 0;
1455         unsigned int total_len;
1456
1457         cifs_dbg(FYI, "TCON\n");
1458
1459         if (!(ses->server) || !tree)
1460                 return -EIO;
1461
1462         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1463         if (unc_path == NULL)
1464                 return -ENOMEM;
1465
1466         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1467         unc_path_len *= 2;
1468         if (unc_path_len < 2) {
1469                 kfree(unc_path);
1470                 return -EINVAL;
1471         }
1472
1473         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1474         tcon->tid = 0;
1475
1476         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1477                              &total_len);
1478         if (rc) {
1479                 kfree(unc_path);
1480                 return rc;
1481         }
1482
1483         if (smb3_encryption_required(tcon))
1484                 flags |= CIFS_TRANSFORM_REQ;
1485
1486         iov[0].iov_base = (char *)req;
1487         /* 1 for pad */
1488         iov[0].iov_len = total_len - 1;
1489
1490         /* Testing shows that buffer offset must be at location of Buffer[0] */
1491         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1492                         - 1 /* pad */);
1493         req->PathLength = cpu_to_le16(unc_path_len - 2);
1494         iov[1].iov_base = unc_path;
1495         iov[1].iov_len = unc_path_len;
1496
1497         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1498         if ((ses->server->dialect == SMB311_PROT_ID) &&
1499             !smb3_encryption_required(tcon))
1500                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1501
1502         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1503         cifs_small_buf_release(req);
1504         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1505
1506         if (rc != 0) {
1507                 if (tcon) {
1508                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1509                         tcon->need_reconnect = true;
1510                 }
1511                 goto tcon_error_exit;
1512         }
1513
1514         switch (rsp->ShareType) {
1515         case SMB2_SHARE_TYPE_DISK:
1516                 cifs_dbg(FYI, "connection to disk share\n");
1517                 break;
1518         case SMB2_SHARE_TYPE_PIPE:
1519                 tcon->pipe = true;
1520                 cifs_dbg(FYI, "connection to pipe share\n");
1521                 break;
1522         case SMB2_SHARE_TYPE_PRINT:
1523                 tcon->print = true;
1524                 cifs_dbg(FYI, "connection to printer\n");
1525                 break;
1526         default:
1527                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1528                 rc = -EOPNOTSUPP;
1529                 goto tcon_error_exit;
1530         }
1531
1532         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1533         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1534         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1535         tcon->tidStatus = CifsGood;
1536         tcon->need_reconnect = false;
1537         tcon->tid = rsp->sync_hdr.TreeId;
1538         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1539
1540         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1541             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1542                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1543
1544         if (tcon->seal &&
1545             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1546                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1547
1548         init_copy_chunk_defaults(tcon);
1549         if (tcon->ses->server->ops->validate_negotiate)
1550                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1551 tcon_exit:
1552         free_rsp_buf(resp_buftype, rsp);
1553         kfree(unc_path);
1554         return rc;
1555
1556 tcon_error_exit:
1557         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1558                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1559         }
1560         goto tcon_exit;
1561 }
1562
1563 int
1564 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1565 {
1566         struct smb2_tree_disconnect_req *req; /* response is trivial */
1567         int rc = 0;
1568         struct cifs_ses *ses = tcon->ses;
1569         int flags = 0;
1570         unsigned int total_len;
1571         struct kvec iov[1];
1572         struct kvec rsp_iov;
1573         int resp_buf_type;
1574
1575         cifs_dbg(FYI, "Tree Disconnect\n");
1576
1577         if (!ses || !(ses->server))
1578                 return -EIO;
1579
1580         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1581                 return 0;
1582
1583         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1584                              &total_len);
1585         if (rc)
1586                 return rc;
1587
1588         if (smb3_encryption_required(tcon))
1589                 flags |= CIFS_TRANSFORM_REQ;
1590
1591         flags |= CIFS_NO_RESP;
1592
1593         iov[0].iov_base = (char *)req;
1594         iov[0].iov_len = total_len;
1595
1596         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1597         cifs_small_buf_release(req);
1598         if (rc)
1599                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1600
1601         return rc;
1602 }
1603
1604
1605 static struct create_durable *
1606 create_durable_buf(void)
1607 {
1608         struct create_durable *buf;
1609
1610         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1611         if (!buf)
1612                 return NULL;
1613
1614         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1615                                         (struct create_durable, Data));
1616         buf->ccontext.DataLength = cpu_to_le32(16);
1617         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1618                                 (struct create_durable, Name));
1619         buf->ccontext.NameLength = cpu_to_le16(4);
1620         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1621         buf->Name[0] = 'D';
1622         buf->Name[1] = 'H';
1623         buf->Name[2] = 'n';
1624         buf->Name[3] = 'Q';
1625         return buf;
1626 }
1627
1628 static struct create_durable *
1629 create_reconnect_durable_buf(struct cifs_fid *fid)
1630 {
1631         struct create_durable *buf;
1632
1633         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1634         if (!buf)
1635                 return NULL;
1636
1637         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1638                                         (struct create_durable, Data));
1639         buf->ccontext.DataLength = cpu_to_le32(16);
1640         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1641                                 (struct create_durable, Name));
1642         buf->ccontext.NameLength = cpu_to_le16(4);
1643         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1644         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1645         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1646         buf->Name[0] = 'D';
1647         buf->Name[1] = 'H';
1648         buf->Name[2] = 'n';
1649         buf->Name[3] = 'C';
1650         return buf;
1651 }
1652
1653 static __u8
1654 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1655                   unsigned int *epoch, char *lease_key)
1656 {
1657         char *data_offset;
1658         struct create_context *cc;
1659         unsigned int next;
1660         unsigned int remaining;
1661         char *name;
1662
1663         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1664         remaining = le32_to_cpu(rsp->CreateContextsLength);
1665         cc = (struct create_context *)data_offset;
1666         while (remaining >= sizeof(struct create_context)) {
1667                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1668                 if (le16_to_cpu(cc->NameLength) == 4 &&
1669                     strncmp(name, "RqLs", 4) == 0)
1670                         return server->ops->parse_lease_buf(cc, epoch,
1671                                                             lease_key);
1672
1673                 next = le32_to_cpu(cc->Next);
1674                 if (!next)
1675                         break;
1676                 remaining -= next;
1677                 cc = (struct create_context *)((char *)cc + next);
1678         }
1679
1680         return 0;
1681 }
1682
1683 static int
1684 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1685                   unsigned int *num_iovec, __u8 *oplock)
1686 {
1687         struct smb2_create_req *req = iov[0].iov_base;
1688         unsigned int num = *num_iovec;
1689
1690         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1691         if (iov[num].iov_base == NULL)
1692                 return -ENOMEM;
1693         iov[num].iov_len = server->vals->create_lease_size;
1694         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1695         if (!req->CreateContextsOffset)
1696                 req->CreateContextsOffset = cpu_to_le32(
1697                                 sizeof(struct smb2_create_req) +
1698                                 iov[num - 1].iov_len);
1699         le32_add_cpu(&req->CreateContextsLength,
1700                      server->vals->create_lease_size);
1701         *num_iovec = num + 1;
1702         return 0;
1703 }
1704
1705 static struct create_durable_v2 *
1706 create_durable_v2_buf(struct cifs_fid *pfid)
1707 {
1708         struct create_durable_v2 *buf;
1709
1710         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1711         if (!buf)
1712                 return NULL;
1713
1714         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1715                                         (struct create_durable_v2, dcontext));
1716         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1717         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1718                                 (struct create_durable_v2, Name));
1719         buf->ccontext.NameLength = cpu_to_le16(4);
1720
1721         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1722         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1723         generate_random_uuid(buf->dcontext.CreateGuid);
1724         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1725
1726         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1727         buf->Name[0] = 'D';
1728         buf->Name[1] = 'H';
1729         buf->Name[2] = '2';
1730         buf->Name[3] = 'Q';
1731         return buf;
1732 }
1733
1734 static struct create_durable_handle_reconnect_v2 *
1735 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1736 {
1737         struct create_durable_handle_reconnect_v2 *buf;
1738
1739         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1740                         GFP_KERNEL);
1741         if (!buf)
1742                 return NULL;
1743
1744         buf->ccontext.DataOffset =
1745                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1746                                      dcontext));
1747         buf->ccontext.DataLength =
1748                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1749         buf->ccontext.NameOffset =
1750                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1751                             Name));
1752         buf->ccontext.NameLength = cpu_to_le16(4);
1753
1754         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1755         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1756         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1757         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1758
1759         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1760         buf->Name[0] = 'D';
1761         buf->Name[1] = 'H';
1762         buf->Name[2] = '2';
1763         buf->Name[3] = 'C';
1764         return buf;
1765 }
1766
1767 static int
1768 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1769                     struct cifs_open_parms *oparms)
1770 {
1771         struct smb2_create_req *req = iov[0].iov_base;
1772         unsigned int num = *num_iovec;
1773
1774         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1775         if (iov[num].iov_base == NULL)
1776                 return -ENOMEM;
1777         iov[num].iov_len = sizeof(struct create_durable_v2);
1778         if (!req->CreateContextsOffset)
1779                 req->CreateContextsOffset =
1780                         cpu_to_le32(sizeof(struct smb2_create_req) +
1781                                                                 iov[1].iov_len);
1782         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1783         *num_iovec = num + 1;
1784         return 0;
1785 }
1786
1787 static int
1788 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1789                     struct cifs_open_parms *oparms)
1790 {
1791         struct smb2_create_req *req = iov[0].iov_base;
1792         unsigned int num = *num_iovec;
1793
1794         /* indicate that we don't need to relock the file */
1795         oparms->reconnect = false;
1796
1797         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1798         if (iov[num].iov_base == NULL)
1799                 return -ENOMEM;
1800         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1801         if (!req->CreateContextsOffset)
1802                 req->CreateContextsOffset =
1803                         cpu_to_le32(sizeof(struct smb2_create_req) +
1804                                                                 iov[1].iov_len);
1805         le32_add_cpu(&req->CreateContextsLength,
1806                         sizeof(struct create_durable_handle_reconnect_v2));
1807         *num_iovec = num + 1;
1808         return 0;
1809 }
1810
1811 static int
1812 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1813                     struct cifs_open_parms *oparms, bool use_persistent)
1814 {
1815         struct smb2_create_req *req = iov[0].iov_base;
1816         unsigned int num = *num_iovec;
1817
1818         if (use_persistent) {
1819                 if (oparms->reconnect)
1820                         return add_durable_reconnect_v2_context(iov, num_iovec,
1821                                                                 oparms);
1822                 else
1823                         return add_durable_v2_context(iov, num_iovec, oparms);
1824         }
1825
1826         if (oparms->reconnect) {
1827                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1828                 /* indicate that we don't need to relock the file */
1829                 oparms->reconnect = false;
1830         } else
1831                 iov[num].iov_base = create_durable_buf();
1832         if (iov[num].iov_base == NULL)
1833                 return -ENOMEM;
1834         iov[num].iov_len = sizeof(struct create_durable);
1835         if (!req->CreateContextsOffset)
1836                 req->CreateContextsOffset =
1837                         cpu_to_le32(sizeof(struct smb2_create_req) +
1838                                                                 iov[1].iov_len);
1839         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1840         *num_iovec = num + 1;
1841         return 0;
1842 }
1843
1844 static int
1845 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1846                             const char *treename, const __le16 *path)
1847 {
1848         int treename_len, path_len;
1849         struct nls_table *cp;
1850         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1851
1852         /*
1853          * skip leading "\\"
1854          */
1855         treename_len = strlen(treename);
1856         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1857                 return -EINVAL;
1858
1859         treename += 2;
1860         treename_len -= 2;
1861
1862         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1863
1864         /*
1865          * make room for one path separator between the treename and
1866          * path
1867          */
1868         *out_len = treename_len + 1 + path_len;
1869
1870         /*
1871          * final path needs to be null-terminated UTF16 with a
1872          * size aligned to 8
1873          */
1874
1875         *out_size = roundup((*out_len+1)*2, 8);
1876         *out_path = kzalloc(*out_size, GFP_KERNEL);
1877         if (!*out_path)
1878                 return -ENOMEM;
1879
1880         cp = load_nls_default();
1881         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1882         UniStrcat(*out_path, sep);
1883         UniStrcat(*out_path, path);
1884         unload_nls(cp);
1885
1886         return 0;
1887 }
1888
1889 int
1890 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1891           __u8 *oplock, struct smb2_file_all_info *buf,
1892           struct kvec *err_iov, int *buftype)
1893 {
1894         struct smb2_create_req *req;
1895         struct smb2_create_rsp *rsp;
1896         struct TCP_Server_Info *server;
1897         struct cifs_tcon *tcon = oparms->tcon;
1898         struct cifs_ses *ses = tcon->ses;
1899         struct kvec iov[5]; /* make sure at least one for each open context */
1900         struct kvec rsp_iov = {NULL, 0};
1901         int resp_buftype;
1902         int uni_path_len;
1903         __le16 *copy_path = NULL;
1904         int copy_size;
1905         int rc = 0;
1906         unsigned int n_iov = 2;
1907         __u32 file_attributes = 0;
1908         char *dhc_buf = NULL, *lc_buf = NULL, *pc_buf = NULL;
1909         int flags = 0;
1910         unsigned int total_len;
1911
1912         cifs_dbg(FYI, "create/open\n");
1913
1914         if (ses && (ses->server))
1915                 server = ses->server;
1916         else
1917                 return -EIO;
1918
1919         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1920
1921         if (rc)
1922                 return rc;
1923
1924         if (smb3_encryption_required(tcon))
1925                 flags |= CIFS_TRANSFORM_REQ;
1926
1927         if (oparms->create_options & CREATE_OPTION_READONLY)
1928                 file_attributes |= ATTR_READONLY;
1929         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1930                 file_attributes |= ATTR_SYSTEM;
1931
1932         req->ImpersonationLevel = IL_IMPERSONATION;
1933         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1934         /* File attributes ignored on open (used in create though) */
1935         req->FileAttributes = cpu_to_le32(file_attributes);
1936         req->ShareAccess = FILE_SHARE_ALL_LE;
1937         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1938         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1939
1940         iov[0].iov_base = (char *)req;
1941         /* -1 since last byte is buf[0] which is sent below (path) */
1942         iov[0].iov_len = total_len - 1;
1943
1944         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1945
1946         /* [MS-SMB2] 2.2.13 NameOffset:
1947          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1948          * the SMB2 header, the file name includes a prefix that will
1949          * be processed during DFS name normalization as specified in
1950          * section 3.3.5.9. Otherwise, the file name is relative to
1951          * the share that is identified by the TreeId in the SMB2
1952          * header.
1953          */
1954         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1955                 int name_len;
1956
1957                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1958                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1959                                                  &name_len,
1960                                                  tcon->treeName, path);
1961                 if (rc) {
1962                         cifs_small_buf_release(req);
1963                         return rc;
1964                 }
1965                 req->NameLength = cpu_to_le16(name_len * 2);
1966                 uni_path_len = copy_size;
1967                 path = copy_path;
1968         } else {
1969                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1970                 /* MUST set path len (NameLength) to 0 opening root of share */
1971                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1972                 if (uni_path_len % 8 != 0) {
1973                         copy_size = roundup(uni_path_len, 8);
1974                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1975                         if (!copy_path) {
1976                                 cifs_small_buf_release(req);
1977                                 return -ENOMEM;
1978                         }
1979                         memcpy((char *)copy_path, (const char *)path,
1980                                uni_path_len);
1981                         uni_path_len = copy_size;
1982                         path = copy_path;
1983                 }
1984         }
1985
1986         iov[1].iov_len = uni_path_len;
1987         iov[1].iov_base = path;
1988
1989         if (!server->oplocks)
1990                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1991
1992         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1993             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1994                 req->RequestedOplockLevel = *oplock;
1995         else {
1996                 rc = add_lease_context(server, iov, &n_iov, oplock);
1997                 if (rc) {
1998                         cifs_small_buf_release(req);
1999                         kfree(copy_path);
2000                         return rc;
2001                 }
2002                 lc_buf = iov[n_iov-1].iov_base;
2003         }
2004
2005         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2006                 /* need to set Next field of lease context if we request it */
2007                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2008                         struct create_context *ccontext =
2009                             (struct create_context *)iov[n_iov-1].iov_base;
2010                         ccontext->Next =
2011                                 cpu_to_le32(server->vals->create_lease_size);
2012                 }
2013
2014                 rc = add_durable_context(iov, &n_iov, oparms,
2015                                         tcon->use_persistent);
2016                 if (rc) {
2017                         cifs_small_buf_release(req);
2018                         kfree(copy_path);
2019                         kfree(lc_buf);
2020                         return rc;
2021                 }
2022                 dhc_buf = iov[n_iov-1].iov_base;
2023         }
2024
2025 #ifdef CONFIG_CIFS_SMB311
2026         if (tcon->posix_extensions) {
2027                 if (n_iov > 2) {
2028                         struct create_context *ccontext =
2029                             (struct create_context *)iov[n_iov-1].iov_base;
2030                         ccontext->Next =
2031                                 cpu_to_le32(iov[n_iov-1].iov_len);
2032                 }
2033
2034                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2035                 if (rc) {
2036                         cifs_small_buf_release(req);
2037                         kfree(copy_path);
2038                         kfree(lc_buf);
2039                         kfree(dhc_buf);
2040                         return rc;
2041                 }
2042                 pc_buf = iov[n_iov-1].iov_base;
2043         }
2044 #endif /* SMB311 */
2045
2046         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
2047                             &rsp_iov);
2048         cifs_small_buf_release(req);
2049         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2050
2051         if (rc != 0) {
2052                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2053                 if (err_iov && rsp) {
2054                         *err_iov = rsp_iov;
2055                         *buftype = resp_buftype;
2056                         resp_buftype = CIFS_NO_BUFFER;
2057                         rsp = NULL;
2058                 }
2059                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2060                                     oparms->create_options, oparms->desired_access, rc);
2061                 goto creat_exit;
2062         } else
2063                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2064                                      ses->Suid, oparms->create_options,
2065                                      oparms->desired_access);
2066
2067         oparms->fid->persistent_fid = rsp->PersistentFileId;
2068         oparms->fid->volatile_fid = rsp->VolatileFileId;
2069
2070         if (buf) {
2071                 memcpy(buf, &rsp->CreationTime, 32);
2072                 buf->AllocationSize = rsp->AllocationSize;
2073                 buf->EndOfFile = rsp->EndofFile;
2074                 buf->Attributes = rsp->FileAttributes;
2075                 buf->NumberOfLinks = cpu_to_le32(1);
2076                 buf->DeletePending = 0;
2077         }
2078
2079         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2080                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2081                                             oparms->fid->lease_key);
2082         else
2083                 *oplock = rsp->OplockLevel;
2084 creat_exit:
2085         kfree(copy_path);
2086         kfree(lc_buf);
2087         kfree(dhc_buf);
2088         kfree(pc_buf);
2089         free_rsp_buf(resp_buftype, rsp);
2090         return rc;
2091 }
2092
2093 /*
2094  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2095  */
2096 int
2097 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2098            u64 volatile_fid, u32 opcode, bool is_fsctl,
2099            char *in_data, u32 indatalen,
2100            char **out_data, u32 *plen /* returned data len */)
2101 {
2102         struct smb2_ioctl_req *req;
2103         struct smb2_ioctl_rsp *rsp;
2104         struct cifs_ses *ses;
2105         struct kvec iov[2];
2106         struct kvec rsp_iov;
2107         int resp_buftype;
2108         int n_iov;
2109         int rc = 0;
2110         int flags = 0;
2111         unsigned int total_len;
2112
2113         cifs_dbg(FYI, "SMB2 IOCTL\n");
2114
2115         if (out_data != NULL)
2116                 *out_data = NULL;
2117
2118         /* zero out returned data len, in case of error */
2119         if (plen)
2120                 *plen = 0;
2121
2122         if (tcon)
2123                 ses = tcon->ses;
2124         else
2125                 return -EIO;
2126
2127         if (!ses || !(ses->server))
2128                 return -EIO;
2129
2130         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2131         if (rc)
2132                 return rc;
2133
2134         if (smb3_encryption_required(tcon))
2135                 flags |= CIFS_TRANSFORM_REQ;
2136
2137         req->CtlCode = cpu_to_le32(opcode);
2138         req->PersistentFileId = persistent_fid;
2139         req->VolatileFileId = volatile_fid;
2140
2141         if (indatalen) {
2142                 req->InputCount = cpu_to_le32(indatalen);
2143                 /* do not set InputOffset if no input data */
2144                 req->InputOffset =
2145                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2146                 iov[1].iov_base = in_data;
2147                 iov[1].iov_len = indatalen;
2148                 n_iov = 2;
2149         } else
2150                 n_iov = 1;
2151
2152         req->OutputOffset = 0;
2153         req->OutputCount = 0; /* MBZ */
2154
2155         /*
2156          * Could increase MaxOutputResponse, but that would require more
2157          * than one credit. Windows typically sets this smaller, but for some
2158          * ioctls it may be useful to allow server to send more. No point
2159          * limiting what the server can send as long as fits in one credit
2160          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2161          * (by default, note that it can be overridden to make max larger)
2162          * in responses (except for read responses which can be bigger.
2163          * We may want to bump this limit up
2164          */
2165         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2166
2167         if (is_fsctl)
2168                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2169         else
2170                 req->Flags = 0;
2171
2172         iov[0].iov_base = (char *)req;
2173
2174         /*
2175          * If no input data, the size of ioctl struct in
2176          * protocol spec still includes a 1 byte data buffer,
2177          * but if input data passed to ioctl, we do not
2178          * want to double count this, so we do not send
2179          * the dummy one byte of data in iovec[0] if sending
2180          * input data (in iovec[1]).
2181          */
2182
2183         if (indatalen) {
2184                 iov[0].iov_len = total_len - 1;
2185         } else
2186                 iov[0].iov_len = total_len;
2187
2188         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2189         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2190                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2191
2192         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
2193                             &rsp_iov);
2194         cifs_small_buf_release(req);
2195         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2196
2197         if (rc != 0)
2198                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2199                                 ses->Suid, 0, opcode, rc);
2200
2201         if ((rc != 0) && (rc != -EINVAL)) {
2202                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2203                 goto ioctl_exit;
2204         } else if (rc == -EINVAL) {
2205                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2206                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2207                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2208                         goto ioctl_exit;
2209                 }
2210         }
2211
2212         /* check if caller wants to look at return data or just return rc */
2213         if ((plen == NULL) || (out_data == NULL))
2214                 goto ioctl_exit;
2215
2216         *plen = le32_to_cpu(rsp->OutputCount);
2217
2218         /* We check for obvious errors in the output buffer length and offset */
2219         if (*plen == 0)
2220                 goto ioctl_exit; /* server returned no data */
2221         else if (*plen > 0xFF00) {
2222                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2223                 *plen = 0;
2224                 rc = -EIO;
2225                 goto ioctl_exit;
2226         }
2227
2228         if (rsp_iov.iov_len < le32_to_cpu(rsp->OutputOffset) + *plen) {
2229                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2230                         le32_to_cpu(rsp->OutputOffset));
2231                 *plen = 0;
2232                 rc = -EIO;
2233                 goto ioctl_exit;
2234         }
2235
2236         *out_data = kmalloc(*plen, GFP_KERNEL);
2237         if (*out_data == NULL) {
2238                 rc = -ENOMEM;
2239                 goto ioctl_exit;
2240         }
2241
2242         memcpy(*out_data, (char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen);
2243 ioctl_exit:
2244         free_rsp_buf(resp_buftype, rsp);
2245         return rc;
2246 }
2247
2248 /*
2249  *   Individual callers to ioctl worker function follow
2250  */
2251
2252 int
2253 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2254                      u64 persistent_fid, u64 volatile_fid)
2255 {
2256         int rc;
2257         struct  compress_ioctl fsctl_input;
2258         char *ret_data = NULL;
2259
2260         fsctl_input.CompressionState =
2261                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2262
2263         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2264                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2265                         (char *)&fsctl_input /* data input */,
2266                         2 /* in data len */, &ret_data /* out data */, NULL);
2267
2268         cifs_dbg(FYI, "set compression rc %d\n", rc);
2269
2270         return rc;
2271 }
2272
2273 int
2274 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2275                  u64 persistent_fid, u64 volatile_fid, int flags)
2276 {
2277         struct smb2_close_req *req;
2278         struct smb2_close_rsp *rsp;
2279         struct cifs_ses *ses = tcon->ses;
2280         struct kvec iov[1];
2281         struct kvec rsp_iov;
2282         int resp_buftype;
2283         int rc = 0;
2284         unsigned int total_len;
2285
2286         cifs_dbg(FYI, "Close\n");
2287
2288         if (!ses || !(ses->server))
2289                 return -EIO;
2290
2291         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2292         if (rc)
2293                 return rc;
2294
2295         if (smb3_encryption_required(tcon))
2296                 flags |= CIFS_TRANSFORM_REQ;
2297
2298         req->PersistentFileId = persistent_fid;
2299         req->VolatileFileId = volatile_fid;
2300
2301         iov[0].iov_base = (char *)req;
2302         iov[0].iov_len = total_len;
2303
2304         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2305         cifs_small_buf_release(req);
2306         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2307
2308         if (rc != 0) {
2309                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2310                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2311                                      rc);
2312                 goto close_exit;
2313         }
2314
2315         /* BB FIXME - decode close response, update inode for caching */
2316
2317 close_exit:
2318         free_rsp_buf(resp_buftype, rsp);
2319         return rc;
2320 }
2321
2322 int
2323 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2324            u64 persistent_fid, u64 volatile_fid)
2325 {
2326         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2327 }
2328
2329 static int
2330 validate_iov(unsigned int offset, unsigned int buffer_length,
2331              struct kvec *iov, unsigned int min_buf_size)
2332 {
2333         unsigned int smb_len = iov->iov_len;
2334         char *end_of_smb = smb_len + (char *)iov->iov_base;
2335         char *begin_of_buf = offset + (char *)iov->iov_base;
2336         char *end_of_buf = begin_of_buf + buffer_length;
2337
2338
2339         if (buffer_length < min_buf_size) {
2340                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2341                          buffer_length, min_buf_size);
2342                 return -EINVAL;
2343         }
2344
2345         /* check if beyond RFC1001 maximum length */
2346         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2347                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2348                          buffer_length, smb_len);
2349                 return -EINVAL;
2350         }
2351
2352         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2353                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2354                 return -EINVAL;
2355         }
2356
2357         return 0;
2358 }
2359
2360 /*
2361  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2362  * Caller must free buffer.
2363  */
2364 static int
2365 validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2366                       struct kvec *iov, unsigned int minbufsize,
2367                       char *data)
2368 {
2369         char *begin_of_buf = offset + (char *)iov->iov_base;
2370         int rc;
2371
2372         if (!data)
2373                 return -EINVAL;
2374
2375         rc = validate_iov(offset, buffer_length, iov, minbufsize);
2376         if (rc)
2377                 return rc;
2378
2379         memcpy(data, begin_of_buf, buffer_length);
2380
2381         return 0;
2382 }
2383
2384 static int
2385 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2386            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2387            u32 additional_info, size_t output_len, size_t min_len, void **data,
2388                 u32 *dlen)
2389 {
2390         struct smb2_query_info_req *req;
2391         struct smb2_query_info_rsp *rsp = NULL;
2392         struct kvec iov[2];
2393         struct kvec rsp_iov;
2394         int rc = 0;
2395         int resp_buftype;
2396         struct cifs_ses *ses = tcon->ses;
2397         int flags = 0;
2398         unsigned int total_len;
2399
2400         cifs_dbg(FYI, "Query Info\n");
2401
2402         if (!ses || !(ses->server))
2403                 return -EIO;
2404
2405         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2406                              &total_len);
2407         if (rc)
2408                 return rc;
2409
2410         if (smb3_encryption_required(tcon))
2411                 flags |= CIFS_TRANSFORM_REQ;
2412
2413         req->InfoType = info_type;
2414         req->FileInfoClass = info_class;
2415         req->PersistentFileId = persistent_fid;
2416         req->VolatileFileId = volatile_fid;
2417         req->AdditionalInformation = cpu_to_le32(additional_info);
2418
2419         /*
2420          * We do not use the input buffer (do not send extra byte)
2421          */
2422         req->InputBufferOffset = 0;
2423
2424         req->OutputBufferLength = cpu_to_le32(output_len);
2425
2426         iov[0].iov_base = (char *)req;
2427         /* 1 for Buffer */
2428         iov[0].iov_len = total_len - 1;
2429
2430         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2431         cifs_small_buf_release(req);
2432         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2433
2434         if (rc) {
2435                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2436                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2437                                 ses->Suid, info_class, (__u32)info_type, rc);
2438                 goto qinf_exit;
2439         }
2440
2441         if (dlen) {
2442                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2443                 if (!*data) {
2444                         *data = kmalloc(*dlen, GFP_KERNEL);
2445                         if (!*data) {
2446                                 cifs_dbg(VFS,
2447                                         "Error %d allocating memory for acl\n",
2448                                         rc);
2449                                 *dlen = 0;
2450                                 goto qinf_exit;
2451                         }
2452                 }
2453         }
2454
2455         rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2456                                    le32_to_cpu(rsp->OutputBufferLength),
2457                                    &rsp_iov, min_len, *data);
2458
2459 qinf_exit:
2460         free_rsp_buf(resp_buftype, rsp);
2461         return rc;
2462 }
2463
2464 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2465                    u64 persistent_fid, u64 volatile_fid,
2466                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2467 {
2468         return query_info(xid, tcon, persistent_fid, volatile_fid,
2469                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2470                           ea_buf_size,
2471                           sizeof(struct smb2_file_full_ea_info),
2472                           (void **)&data,
2473                           NULL);
2474 }
2475
2476 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2477         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2478 {
2479         return query_info(xid, tcon, persistent_fid, volatile_fid,
2480                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2481                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2482                           sizeof(struct smb2_file_all_info), (void **)&data,
2483                           NULL);
2484 }
2485
2486 int
2487 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2488                 u64 persistent_fid, u64 volatile_fid,
2489                 void **data, u32 *plen)
2490 {
2491         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2492         *plen = 0;
2493
2494         return query_info(xid, tcon, persistent_fid, volatile_fid,
2495                           0, SMB2_O_INFO_SECURITY, additional_info,
2496                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2497 }
2498
2499 int
2500 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2501                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2502 {
2503         return query_info(xid, tcon, persistent_fid, volatile_fid,
2504                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2505                           sizeof(struct smb2_file_internal_info),
2506                           sizeof(struct smb2_file_internal_info),
2507                           (void **)&uniqueid, NULL);
2508 }
2509
2510 /*
2511  * This is a no-op for now. We're not really interested in the reply, but
2512  * rather in the fact that the server sent one and that server->lstrp
2513  * gets updated.
2514  *
2515  * FIXME: maybe we should consider checking that the reply matches request?
2516  */
2517 static void
2518 smb2_echo_callback(struct mid_q_entry *mid)
2519 {
2520         struct TCP_Server_Info *server = mid->callback_data;
2521         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2522         unsigned int credits_received = 1;
2523
2524         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2525                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2526
2527         DeleteMidQEntry(mid);
2528         add_credits(server, credits_received, CIFS_ECHO_OP);
2529 }
2530
2531 void smb2_reconnect_server(struct work_struct *work)
2532 {
2533         struct TCP_Server_Info *server = container_of(work,
2534                                         struct TCP_Server_Info, reconnect.work);
2535         struct cifs_ses *ses;
2536         struct cifs_tcon *tcon, *tcon2;
2537         struct list_head tmp_list;
2538         int tcon_exist = false;
2539         int rc;
2540         int resched = false;
2541
2542
2543         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2544         mutex_lock(&server->reconnect_mutex);
2545
2546         INIT_LIST_HEAD(&tmp_list);
2547         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2548
2549         spin_lock(&cifs_tcp_ses_lock);
2550         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2551                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2552                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2553                                 tcon->tc_count++;
2554                                 list_add_tail(&tcon->rlist, &tmp_list);
2555                                 tcon_exist = true;
2556                         }
2557                 }
2558                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2559                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2560                         tcon_exist = true;
2561                 }
2562         }
2563         /*
2564          * Get the reference to server struct to be sure that the last call of
2565          * cifs_put_tcon() in the loop below won't release the server pointer.
2566          */
2567         if (tcon_exist)
2568                 server->srv_count++;
2569
2570         spin_unlock(&cifs_tcp_ses_lock);
2571
2572         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2573                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2574                 if (!rc)
2575                         cifs_reopen_persistent_handles(tcon);
2576                 else
2577                         resched = true;
2578                 list_del_init(&tcon->rlist);
2579                 cifs_put_tcon(tcon);
2580         }
2581
2582         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2583         if (resched)
2584                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2585         mutex_unlock(&server->reconnect_mutex);
2586
2587         /* now we can safely release srv struct */
2588         if (tcon_exist)
2589                 cifs_put_tcp_session(server, 1);
2590 }
2591
2592 int
2593 SMB2_echo(struct TCP_Server_Info *server)
2594 {
2595         struct smb2_echo_req *req;
2596         int rc = 0;
2597         struct kvec iov[2];
2598         struct smb_rqst rqst = { .rq_iov = iov,
2599                                  .rq_nvec = 2 };
2600         unsigned int total_len;
2601         __be32 rfc1002_marker;
2602
2603         cifs_dbg(FYI, "In echo request\n");
2604
2605         if (server->tcpStatus == CifsNeedNegotiate) {
2606                 /* No need to send echo on newly established connections */
2607                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2608                 return rc;
2609         }
2610
2611         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2612         if (rc)
2613                 return rc;
2614
2615         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2616
2617         iov[0].iov_len = 4;
2618         rfc1002_marker = cpu_to_be32(total_len);
2619         iov[0].iov_base = &rfc1002_marker;
2620         iov[1].iov_len = total_len;
2621         iov[1].iov_base = (char *)req;
2622
2623         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2624                              server, CIFS_ECHO_OP);
2625         if (rc)
2626                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2627
2628         cifs_small_buf_release(req);
2629         return rc;
2630 }
2631
2632 int
2633 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2634            u64 volatile_fid)
2635 {
2636         struct smb2_flush_req *req;
2637         struct cifs_ses *ses = tcon->ses;
2638         struct kvec iov[1];
2639         struct kvec rsp_iov;
2640         int resp_buftype;
2641         int rc = 0;
2642         int flags = 0;
2643         unsigned int total_len;
2644
2645         cifs_dbg(FYI, "Flush\n");
2646
2647         if (!ses || !(ses->server))
2648                 return -EIO;
2649
2650         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2651         if (rc)
2652                 return rc;
2653
2654         if (smb3_encryption_required(tcon))
2655                 flags |= CIFS_TRANSFORM_REQ;
2656
2657         req->PersistentFileId = persistent_fid;
2658         req->VolatileFileId = volatile_fid;
2659
2660         iov[0].iov_base = (char *)req;
2661         iov[0].iov_len = total_len;
2662
2663         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2664         cifs_small_buf_release(req);
2665
2666         if (rc != 0) {
2667                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2668                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
2669                                      rc);
2670         }
2671
2672         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2673         return rc;
2674 }
2675
2676 /*
2677  * To form a chain of read requests, any read requests after the first should
2678  * have the end_of_chain boolean set to true.
2679  */
2680 static int
2681 smb2_new_read_req(void **buf, unsigned int *total_len,
2682         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2683         unsigned int remaining_bytes, int request_type)
2684 {
2685         int rc = -EACCES;
2686         struct smb2_read_plain_req *req = NULL;
2687         struct smb2_sync_hdr *shdr;
2688         struct TCP_Server_Info *server;
2689
2690         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2691                                  total_len);
2692         if (rc)
2693                 return rc;
2694
2695         server = io_parms->tcon->ses->server;
2696         if (server == NULL)
2697                 return -ECONNABORTED;
2698
2699         shdr = &req->sync_hdr;
2700         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2701
2702         req->PersistentFileId = io_parms->persistent_fid;
2703         req->VolatileFileId = io_parms->volatile_fid;
2704         req->ReadChannelInfoOffset = 0; /* reserved */
2705         req->ReadChannelInfoLength = 0; /* reserved */
2706         req->Channel = 0; /* reserved */
2707         req->MinimumCount = 0;
2708         req->Length = cpu_to_le32(io_parms->length);
2709         req->Offset = cpu_to_le64(io_parms->offset);
2710 #ifdef CONFIG_CIFS_SMB_DIRECT
2711         /*
2712          * If we want to do a RDMA write, fill in and append
2713          * smbd_buffer_descriptor_v1 to the end of read request
2714          */
2715         if (server->rdma && rdata && !server->sign &&
2716                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2717
2718                 struct smbd_buffer_descriptor_v1 *v1;
2719                 bool need_invalidate =
2720                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2721
2722                 rdata->mr = smbd_register_mr(
2723                                 server->smbd_conn, rdata->pages,
2724                                 rdata->nr_pages, rdata->page_offset,
2725                                 rdata->tailsz, true, need_invalidate);
2726                 if (!rdata->mr)
2727                         return -ENOBUFS;
2728
2729                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2730                 if (need_invalidate)
2731                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2732                 req->ReadChannelInfoOffset =
2733                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2734                 req->ReadChannelInfoLength =
2735                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2736                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2737                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2738                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2739                 v1->length = cpu_to_le32(rdata->mr->mr->length);
2740
2741                 *total_len += sizeof(*v1) - 1;
2742         }
2743 #endif
2744         if (request_type & CHAINED_REQUEST) {
2745                 if (!(request_type & END_OF_CHAIN)) {
2746                         /* next 8-byte aligned request */
2747                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2748                         shdr->NextCommand = cpu_to_le32(*total_len);
2749                 } else /* END_OF_CHAIN */
2750                         shdr->NextCommand = 0;
2751                 if (request_type & RELATED_REQUEST) {
2752                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2753                         /*
2754                          * Related requests use info from previous read request
2755                          * in chain.
2756                          */
2757                         shdr->SessionId = 0xFFFFFFFF;
2758                         shdr->TreeId = 0xFFFFFFFF;
2759                         req->PersistentFileId = 0xFFFFFFFF;
2760                         req->VolatileFileId = 0xFFFFFFFF;
2761                 }
2762         }
2763         if (remaining_bytes > io_parms->length)
2764                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2765         else
2766                 req->RemainingBytes = 0;
2767
2768         *buf = req;
2769         return rc;
2770 }
2771
2772 static void
2773 smb2_readv_callback(struct mid_q_entry *mid)
2774 {
2775         struct cifs_readdata *rdata = mid->callback_data;
2776         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2777         struct TCP_Server_Info *server = tcon->ses->server;
2778         struct smb2_sync_hdr *shdr =
2779                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
2780         unsigned int credits_received = 1;
2781         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2782                                  .rq_nvec = 2,
2783                                  .rq_pages = rdata->pages,
2784                                  .rq_offset = rdata->page_offset,
2785                                  .rq_npages = rdata->nr_pages,
2786                                  .rq_pagesz = rdata->pagesz,
2787                                  .rq_tailsz = rdata->tailsz };
2788
2789         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2790                  __func__, mid->mid, mid->mid_state, rdata->result,
2791                  rdata->bytes);
2792
2793         switch (mid->mid_state) {
2794         case MID_RESPONSE_RECEIVED:
2795                 credits_received = le16_to_cpu(shdr->CreditRequest);
2796                 /* result already set, check signature */
2797                 if (server->sign && !mid->decrypted) {
2798                         int rc;
2799
2800                         rc = smb2_verify_signature(&rqst, server);
2801                         if (rc)
2802                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2803                                          rc);
2804                 }
2805                 /* FIXME: should this be counted toward the initiating task? */
2806                 task_io_account_read(rdata->got_bytes);
2807                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2808                 break;
2809         case MID_REQUEST_SUBMITTED:
2810         case MID_RETRY_NEEDED:
2811                 rdata->result = -EAGAIN;
2812                 if (server->sign && rdata->got_bytes)
2813                         /* reset bytes number since we can not check a sign */
2814                         rdata->got_bytes = 0;
2815                 /* FIXME: should this be counted toward the initiating task? */
2816                 task_io_account_read(rdata->got_bytes);
2817                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2818                 break;
2819         default:
2820                 if (rdata->result != -ENODATA)
2821                         rdata->result = -EIO;
2822         }
2823 #ifdef CONFIG_CIFS_SMB_DIRECT
2824         /*
2825          * If this rdata has a memmory registered, the MR can be freed
2826          * MR needs to be freed as soon as I/O finishes to prevent deadlock
2827          * because they have limited number and are used for future I/Os
2828          */
2829         if (rdata->mr) {
2830                 smbd_deregister_mr(rdata->mr);
2831                 rdata->mr = NULL;
2832         }
2833 #endif
2834         if (rdata->result)
2835                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2836
2837         queue_work(cifsiod_wq, &rdata->work);
2838         DeleteMidQEntry(mid);
2839         add_credits(server, credits_received, 0);
2840 }
2841
2842 /* smb2_async_readv - send an async read, and set up mid to handle result */
2843 int
2844 smb2_async_readv(struct cifs_readdata *rdata)
2845 {
2846         int rc, flags = 0;
2847         char *buf;
2848         struct smb2_sync_hdr *shdr;
2849         struct cifs_io_parms io_parms;
2850         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2851                                  .rq_nvec = 2 };
2852         struct TCP_Server_Info *server;
2853         unsigned int total_len;
2854         __be32 req_len;
2855
2856         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2857                  __func__, rdata->offset, rdata->bytes);
2858
2859         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2860         io_parms.offset = rdata->offset;
2861         io_parms.length = rdata->bytes;
2862         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2863         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2864         io_parms.pid = rdata->pid;
2865
2866         server = io_parms.tcon->ses->server;
2867
2868         rc = smb2_new_read_req(
2869                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
2870         if (rc) {
2871                 if (rc == -EAGAIN && rdata->credits) {
2872                         /* credits was reset by reconnect */
2873                         rdata->credits = 0;
2874                         /* reduce in_flight value since we won't send the req */
2875                         spin_lock(&server->req_lock);
2876                         server->in_flight--;
2877                         spin_unlock(&server->req_lock);
2878                 }
2879                 return rc;
2880         }
2881
2882         if (smb3_encryption_required(io_parms.tcon))
2883                 flags |= CIFS_TRANSFORM_REQ;
2884
2885         req_len = cpu_to_be32(total_len);
2886
2887         rdata->iov[0].iov_base = &req_len;
2888         rdata->iov[0].iov_len = sizeof(__be32);
2889         rdata->iov[1].iov_base = buf;
2890         rdata->iov[1].iov_len = total_len;
2891
2892         shdr = (struct smb2_sync_hdr *)buf;
2893
2894         if (rdata->credits) {
2895                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2896                                                 SMB2_MAX_BUFFER_SIZE));
2897                 shdr->CreditRequest = shdr->CreditCharge;
2898                 spin_lock(&server->req_lock);
2899                 server->credits += rdata->credits -
2900                                                 le16_to_cpu(shdr->CreditCharge);
2901                 spin_unlock(&server->req_lock);
2902                 wake_up(&server->request_q);
2903                 flags |= CIFS_HAS_CREDITS;
2904         }
2905
2906         kref_get(&rdata->refcount);
2907         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2908                              cifs_readv_receive, smb2_readv_callback,
2909                              smb3_handle_read_data, rdata, flags);
2910         if (rc) {
2911                 kref_put(&rdata->refcount, cifs_readdata_release);
2912                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2913                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
2914                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
2915                                    io_parms.offset, io_parms.length);
2916         } else
2917                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
2918                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
2919                                    io_parms.offset, io_parms.length);
2920
2921         cifs_small_buf_release(buf);
2922         return rc;
2923 }
2924
2925 int
2926 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2927           unsigned int *nbytes, char **buf, int *buf_type)
2928 {
2929         int resp_buftype, rc = -EACCES;
2930         struct smb2_read_plain_req *req = NULL;
2931         struct smb2_read_rsp *rsp = NULL;
2932         struct kvec iov[1];
2933         struct kvec rsp_iov;
2934         unsigned int total_len;
2935         int flags = CIFS_LOG_ERROR;
2936         struct cifs_ses *ses = io_parms->tcon->ses;
2937
2938         *nbytes = 0;
2939         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
2940         if (rc)
2941                 return rc;
2942
2943         if (smb3_encryption_required(io_parms->tcon))
2944                 flags |= CIFS_TRANSFORM_REQ;
2945
2946         iov[0].iov_base = (char *)req;
2947         iov[0].iov_len = total_len;
2948
2949         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2950         cifs_small_buf_release(req);
2951
2952         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2953
2954         if (rc) {
2955                 if (rc != -ENODATA) {
2956                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2957                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
2958                 }
2959                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
2960                                     io_parms->tcon->tid, ses->Suid,
2961                                     io_parms->offset, io_parms->length);
2962                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2963                 return rc == -ENODATA ? 0 : rc;
2964         } else
2965                 trace_smb3_read_done(xid, req->PersistentFileId,
2966                                     io_parms->tcon->tid, ses->Suid,
2967                                     io_parms->offset, io_parms->length);
2968
2969         *nbytes = le32_to_cpu(rsp->DataLength);
2970         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2971             (*nbytes > io_parms->length)) {
2972                 cifs_dbg(FYI, "bad length %d for count %d\n",
2973                          *nbytes, io_parms->length);
2974                 rc = -EIO;
2975                 *nbytes = 0;
2976         }
2977
2978         if (*buf) {
2979                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
2980                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2981         } else if (resp_buftype != CIFS_NO_BUFFER) {
2982                 *buf = rsp_iov.iov_base;
2983                 if (resp_buftype == CIFS_SMALL_BUFFER)
2984                         *buf_type = CIFS_SMALL_BUFFER;
2985                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2986                         *buf_type = CIFS_LARGE_BUFFER;
2987         }
2988         return rc;
2989 }
2990
2991 /*
2992  * Check the mid_state and signature on received buffer (if any), and queue the
2993  * workqueue completion task.
2994  */
2995 static void
2996 smb2_writev_callback(struct mid_q_entry *mid)
2997 {
2998         struct cifs_writedata *wdata = mid->callback_data;
2999         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3000         unsigned int written;
3001         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3002         unsigned int credits_received = 1;
3003
3004         switch (mid->mid_state) {
3005         case MID_RESPONSE_RECEIVED:
3006                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3007                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3008                 if (wdata->result != 0)
3009                         break;
3010
3011                 written = le32_to_cpu(rsp->DataLength);
3012                 /*
3013                  * Mask off high 16 bits when bytes written as returned
3014                  * by the server is greater than bytes requested by the
3015                  * client. OS/2 servers are known to set incorrect
3016                  * CountHigh values.
3017                  */
3018                 if (written > wdata->bytes)
3019                         written &= 0xFFFF;
3020
3021                 if (written < wdata->bytes)
3022                         wdata->result = -ENOSPC;
3023                 else
3024                         wdata->bytes = written;
3025                 break;
3026         case MID_REQUEST_SUBMITTED:
3027         case MID_RETRY_NEEDED:
3028                 wdata->result = -EAGAIN;
3029                 break;
3030         default:
3031                 wdata->result = -EIO;
3032                 break;
3033         }
3034 #ifdef CONFIG_CIFS_SMB_DIRECT
3035         /*
3036          * If this wdata has a memory registered, the MR can be freed
3037          * The number of MRs available is limited, it's important to recover
3038          * used MR as soon as I/O is finished. Hold MR longer in the later
3039          * I/O process can possibly result in I/O deadlock due to lack of MR
3040          * to send request on I/O retry
3041          */
3042         if (wdata->mr) {
3043                 smbd_deregister_mr(wdata->mr);
3044                 wdata->mr = NULL;
3045         }
3046 #endif
3047         if (wdata->result)
3048                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3049
3050         queue_work(cifsiod_wq, &wdata->work);
3051         DeleteMidQEntry(mid);
3052         add_credits(tcon->ses->server, credits_received, 0);
3053 }
3054
3055 /* smb2_async_writev - send an async write, and set up mid to handle result */
3056 int
3057 smb2_async_writev(struct cifs_writedata *wdata,
3058                   void (*release)(struct kref *kref))
3059 {
3060         int rc = -EACCES, flags = 0;
3061         struct smb2_write_req *req = NULL;
3062         struct smb2_sync_hdr *shdr;
3063         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3064         struct TCP_Server_Info *server = tcon->ses->server;
3065         struct kvec iov[2];
3066         struct smb_rqst rqst = { };
3067         unsigned int total_len;
3068         __be32 rfc1002_marker;
3069
3070         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3071         if (rc) {
3072                 if (rc == -EAGAIN && wdata->credits) {
3073                         /* credits was reset by reconnect */
3074                         wdata->credits = 0;
3075                         /* reduce in_flight value since we won't send the req */
3076                         spin_lock(&server->req_lock);
3077                         server->in_flight--;
3078                         spin_unlock(&server->req_lock);
3079                 }
3080                 goto async_writev_out;
3081         }
3082
3083         if (smb3_encryption_required(tcon))
3084                 flags |= CIFS_TRANSFORM_REQ;
3085
3086         shdr = (struct smb2_sync_hdr *)req;
3087         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3088
3089         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3090         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3091         req->WriteChannelInfoOffset = 0;
3092         req->WriteChannelInfoLength = 0;
3093         req->Channel = 0;
3094         req->Offset = cpu_to_le64(wdata->offset);
3095         req->DataOffset = cpu_to_le16(
3096                                 offsetof(struct smb2_write_req, Buffer));
3097         req->RemainingBytes = 0;
3098 #ifdef CONFIG_CIFS_SMB_DIRECT
3099         /*
3100          * If we want to do a server RDMA read, fill in and append
3101          * smbd_buffer_descriptor_v1 to the end of write request
3102          */
3103         if (server->rdma && !server->sign && wdata->bytes >=
3104                 server->smbd_conn->rdma_readwrite_threshold) {
3105
3106                 struct smbd_buffer_descriptor_v1 *v1;
3107                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3108
3109                 wdata->mr = smbd_register_mr(
3110                                 server->smbd_conn, wdata->pages,
3111                                 wdata->nr_pages, wdata->page_offset,
3112                                 wdata->tailsz, false, need_invalidate);
3113                 if (!wdata->mr) {
3114                         rc = -ENOBUFS;
3115                         goto async_writev_out;
3116                 }
3117                 req->Length = 0;
3118                 req->DataOffset = 0;
3119                 if (wdata->nr_pages > 1)
3120                         req->RemainingBytes =
3121                                 cpu_to_le32(
3122                                         (wdata->nr_pages - 1) * wdata->pagesz -
3123                                         wdata->page_offset + wdata->tailsz
3124                                 );
3125                 else
3126                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3127                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3128                 if (need_invalidate)
3129                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3130                 req->WriteChannelInfoOffset =
3131                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3132                 req->WriteChannelInfoLength =
3133                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3134                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3135                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3136                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3137                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3138         }
3139 #endif
3140         /* 4 for rfc1002 length field and 1 for Buffer */
3141         iov[0].iov_len = 4;
3142         rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes);
3143         iov[0].iov_base = &rfc1002_marker;
3144         iov[1].iov_len = total_len - 1;
3145         iov[1].iov_base = (char *)req;
3146
3147         rqst.rq_iov = iov;
3148         rqst.rq_nvec = 2;
3149         rqst.rq_pages = wdata->pages;
3150         rqst.rq_offset = wdata->page_offset;
3151         rqst.rq_npages = wdata->nr_pages;
3152         rqst.rq_pagesz = wdata->pagesz;
3153         rqst.rq_tailsz = wdata->tailsz;
3154 #ifdef CONFIG_CIFS_SMB_DIRECT
3155         if (wdata->mr) {
3156                 iov[1].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3157                 rqst.rq_npages = 0;
3158         }
3159 #endif
3160         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3161                  wdata->offset, wdata->bytes);
3162
3163 #ifdef CONFIG_CIFS_SMB_DIRECT
3164         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3165         if (!wdata->mr)
3166                 req->Length = cpu_to_le32(wdata->bytes);
3167 #else
3168         req->Length = cpu_to_le32(wdata->bytes);
3169 #endif
3170
3171         if (wdata->credits) {
3172                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3173                                                     SMB2_MAX_BUFFER_SIZE));
3174                 shdr->CreditRequest = shdr->CreditCharge;
3175                 spin_lock(&server->req_lock);
3176                 server->credits += wdata->credits -
3177                                                 le16_to_cpu(shdr->CreditCharge);
3178                 spin_unlock(&server->req_lock);
3179                 wake_up(&server->request_q);
3180                 flags |= CIFS_HAS_CREDITS;
3181         }
3182
3183         kref_get(&wdata->refcount);
3184         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3185                              wdata, flags);
3186
3187         if (rc) {
3188                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3189                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3190                                      wdata->bytes, rc);
3191                 kref_put(&wdata->refcount, release);
3192                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3193         } else
3194                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3195                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3196                                      wdata->bytes);
3197
3198 async_writev_out:
3199         cifs_small_buf_release(req);
3200         return rc;
3201 }
3202
3203 /*
3204  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3205  * The length field from io_parms must be at least 1 and indicates a number of
3206  * elements with data to write that begins with position 1 in iov array. All
3207  * data length is specified by count.
3208  */
3209 int
3210 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3211            unsigned int *nbytes, struct kvec *iov, int n_vec)
3212 {
3213         int rc = 0;
3214         struct smb2_write_req *req = NULL;
3215         struct smb2_write_rsp *rsp = NULL;
3216         int resp_buftype;
3217         struct kvec rsp_iov;
3218         int flags = 0;
3219         unsigned int total_len;
3220
3221         *nbytes = 0;
3222
3223         if (n_vec < 1)
3224                 return rc;
3225
3226         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3227                              &total_len);
3228         if (rc)
3229                 return rc;
3230
3231         if (io_parms->tcon->ses->server == NULL)
3232                 return -ECONNABORTED;
3233
3234         if (smb3_encryption_required(io_parms->tcon))
3235                 flags |= CIFS_TRANSFORM_REQ;
3236
3237         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3238
3239         req->PersistentFileId = io_parms->persistent_fid;
3240         req->VolatileFileId = io_parms->volatile_fid;
3241         req->WriteChannelInfoOffset = 0;
3242         req->WriteChannelInfoLength = 0;
3243         req->Channel = 0;
3244         req->Length = cpu_to_le32(io_parms->length);
3245         req->Offset = cpu_to_le64(io_parms->offset);
3246         req->DataOffset = cpu_to_le16(
3247                                 offsetof(struct smb2_write_req, Buffer));
3248         req->RemainingBytes = 0;
3249
3250         iov[0].iov_base = (char *)req;
3251         /* 1 for Buffer */
3252         iov[0].iov_len = total_len - 1;
3253
3254         rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
3255                             &resp_buftype, flags, &rsp_iov);
3256         cifs_small_buf_release(req);
3257         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3258
3259         if (rc) {
3260                 trace_smb3_write_err(xid, req->PersistentFileId,
3261                                      io_parms->tcon->tid,
3262                                      io_parms->tcon->ses->Suid,
3263                                      io_parms->offset, io_parms->length, rc);
3264                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3265                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3266         } else {
3267                 *nbytes = le32_to_cpu(rsp->DataLength);
3268                 trace_smb3_write_done(xid, req->PersistentFileId,
3269                                      io_parms->tcon->tid,
3270                                      io_parms->tcon->ses->Suid,
3271                                      io_parms->offset, *nbytes);
3272         }
3273
3274         free_rsp_buf(resp_buftype, rsp);
3275         return rc;
3276 }
3277
3278 static unsigned int
3279 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3280 {
3281         int len;
3282         unsigned int entrycount = 0;
3283         unsigned int next_offset = 0;
3284         FILE_DIRECTORY_INFO *entryptr;
3285
3286         if (bufstart == NULL)
3287                 return 0;
3288
3289         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3290
3291         while (1) {
3292                 entryptr = (FILE_DIRECTORY_INFO *)
3293                                         ((char *)entryptr + next_offset);
3294
3295                 if ((char *)entryptr + size > end_of_buf) {
3296                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3297                         break;
3298                 }
3299
3300                 len = le32_to_cpu(entryptr->FileNameLength);
3301                 if ((char *)entryptr + len + size > end_of_buf) {
3302                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3303                                  end_of_buf);
3304                         break;
3305                 }
3306
3307                 *lastentry = (char *)entryptr;
3308                 entrycount++;
3309
3310                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3311                 if (!next_offset)
3312                         break;
3313         }
3314
3315         return entrycount;
3316 }
3317
3318 /*
3319  * Readdir/FindFirst
3320  */
3321 int
3322 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3323                      u64 persistent_fid, u64 volatile_fid, int index,
3324                      struct cifs_search_info *srch_inf)
3325 {
3326         struct smb2_query_directory_req *req;
3327         struct smb2_query_directory_rsp *rsp = NULL;
3328         struct kvec iov[2];
3329         struct kvec rsp_iov;
3330         int rc = 0;
3331         int len;
3332         int resp_buftype = CIFS_NO_BUFFER;
3333         unsigned char *bufptr;
3334         struct TCP_Server_Info *server;
3335         struct cifs_ses *ses = tcon->ses;
3336         __le16 asteriks = cpu_to_le16('*');
3337         char *end_of_smb;
3338         unsigned int output_size = CIFSMaxBufSize;
3339         size_t info_buf_size;
3340         int flags = 0;
3341         unsigned int total_len;
3342
3343         if (ses && (ses->server))
3344                 server = ses->server;
3345         else
3346                 return -EIO;
3347
3348         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3349                              &total_len);
3350         if (rc)
3351                 return rc;
3352
3353         if (smb3_encryption_required(tcon))
3354                 flags |= CIFS_TRANSFORM_REQ;
3355
3356         switch (srch_inf->info_level) {
3357         case SMB_FIND_FILE_DIRECTORY_INFO:
3358                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3359                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3360                 break;
3361         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3362                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3363                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3364                 break;
3365         default:
3366                 cifs_dbg(VFS, "info level %u isn't supported\n",
3367                          srch_inf->info_level);
3368                 rc = -EINVAL;
3369                 goto qdir_exit;
3370         }
3371
3372         req->FileIndex = cpu_to_le32(index);
3373         req->PersistentFileId = persistent_fid;
3374         req->VolatileFileId = volatile_fid;
3375
3376         len = 0x2;
3377         bufptr = req->Buffer;
3378         memcpy(bufptr, &asteriks, len);
3379
3380         req->FileNameOffset =
3381                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3382         req->FileNameLength = cpu_to_le16(len);
3383         /*
3384          * BB could be 30 bytes or so longer if we used SMB2 specific
3385          * buffer lengths, but this is safe and close enough.
3386          */
3387         output_size = min_t(unsigned int, output_size, server->maxBuf);
3388         output_size = min_t(unsigned int, output_size, 2 << 15);
3389         req->OutputBufferLength = cpu_to_le32(output_size);
3390
3391         iov[0].iov_base = (char *)req;
3392         /* 1 for Buffer */
3393         iov[0].iov_len = total_len - 1;
3394
3395         iov[1].iov_base = (char *)(req->Buffer);
3396         iov[1].iov_len = len;
3397
3398         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3399         cifs_small_buf_release(req);
3400         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3401
3402         if (rc) {
3403                 if (rc == -ENODATA &&
3404                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3405                         srch_inf->endOfSearch = true;
3406                         rc = 0;
3407                 }
3408                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3409                 goto qdir_exit;
3410         }
3411
3412         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3413                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3414                           info_buf_size);
3415         if (rc)
3416                 goto qdir_exit;
3417
3418         srch_inf->unicode = true;
3419
3420         if (srch_inf->ntwrk_buf_start) {
3421                 if (srch_inf->smallBuf)
3422                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3423                 else
3424                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3425         }
3426         srch_inf->ntwrk_buf_start = (char *)rsp;
3427         srch_inf->srch_entries_start = srch_inf->last_entry =
3428                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3429         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3430         srch_inf->entries_in_buffer =
3431                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3432                                     &srch_inf->last_entry, info_buf_size);
3433         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3434         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3435                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3436                  srch_inf->srch_entries_start, srch_inf->last_entry);
3437         if (resp_buftype == CIFS_LARGE_BUFFER)
3438                 srch_inf->smallBuf = false;
3439         else if (resp_buftype == CIFS_SMALL_BUFFER)
3440                 srch_inf->smallBuf = true;
3441         else
3442                 cifs_dbg(VFS, "illegal search buffer type\n");
3443
3444         return rc;
3445
3446 qdir_exit:
3447         free_rsp_buf(resp_buftype, rsp);
3448         return rc;
3449 }
3450
3451 static int
3452 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3453                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3454                u8 info_type, u32 additional_info, unsigned int num,
3455                 void **data, unsigned int *size)
3456 {
3457         struct smb2_set_info_req *req;
3458         struct smb2_set_info_rsp *rsp = NULL;
3459         struct kvec *iov;
3460         struct kvec rsp_iov;
3461         int rc = 0;
3462         int resp_buftype;
3463         unsigned int i;
3464         struct cifs_ses *ses = tcon->ses;
3465         int flags = 0;
3466         unsigned int total_len;
3467
3468         if (!ses || !(ses->server))
3469                 return -EIO;
3470
3471         if (!num)
3472                 return -EINVAL;
3473
3474         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3475         if (!iov)
3476                 return -ENOMEM;
3477
3478         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3479         if (rc) {
3480                 kfree(iov);
3481                 return rc;
3482         }
3483
3484         if (smb3_encryption_required(tcon))
3485                 flags |= CIFS_TRANSFORM_REQ;
3486
3487         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3488
3489         req->InfoType = info_type;
3490         req->FileInfoClass = info_class;
3491         req->PersistentFileId = persistent_fid;
3492         req->VolatileFileId = volatile_fid;
3493         req->AdditionalInformation = cpu_to_le32(additional_info);
3494
3495         req->BufferOffset =
3496                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3497         req->BufferLength = cpu_to_le32(*size);
3498
3499         memcpy(req->Buffer, *data, *size);
3500         total_len += *size;
3501
3502         iov[0].iov_base = (char *)req;
3503         /* 1 for Buffer */
3504         iov[0].iov_len = total_len - 1;
3505
3506         for (i = 1; i < num; i++) {
3507                 le32_add_cpu(&req->BufferLength, size[i]);
3508                 iov[i].iov_base = (char *)data[i];
3509                 iov[i].iov_len = size[i];
3510         }
3511
3512         rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
3513                             &rsp_iov);
3514         cifs_small_buf_release(req);
3515         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3516
3517         if (rc != 0) {
3518                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3519                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3520                                 ses->Suid, info_class, (__u32)info_type, rc);
3521         }
3522
3523         free_rsp_buf(resp_buftype, rsp);
3524         kfree(iov);
3525         return rc;
3526 }
3527
3528 int
3529 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3530             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3531 {
3532         struct smb2_file_rename_info info;
3533         void **data;
3534         unsigned int size[2];
3535         int rc;
3536         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3537
3538         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3539         if (!data)
3540                 return -ENOMEM;
3541
3542         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3543                               /* 0 = fail if target already exists */
3544         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3545         info.FileNameLength = cpu_to_le32(len);
3546
3547         data[0] = &info;
3548         size[0] = sizeof(struct smb2_file_rename_info);
3549
3550         data[1] = target_file;
3551         size[1] = len + 2 /* null */;
3552
3553         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3554                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3555                 0, 2, data, size);
3556         kfree(data);
3557         return rc;
3558 }
3559
3560 int
3561 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3562                   u64 persistent_fid, u64 volatile_fid)
3563 {
3564         __u8 delete_pending = 1;
3565         void *data;
3566         unsigned int size;
3567
3568         data = &delete_pending;
3569         size = 1; /* sizeof __u8 */
3570
3571         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3572                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3573                 0, 1, &data, &size);
3574 }
3575
3576 int
3577 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3578                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3579 {
3580         struct smb2_file_link_info info;
3581         void **data;
3582         unsigned int size[2];
3583         int rc;
3584         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3585
3586         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3587         if (!data)
3588                 return -ENOMEM;
3589
3590         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3591                               /* 0 = fail if link already exists */
3592         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3593         info.FileNameLength = cpu_to_le32(len);
3594
3595         data[0] = &info;
3596         size[0] = sizeof(struct smb2_file_link_info);
3597
3598         data[1] = target_file;
3599         size[1] = len + 2 /* null */;
3600
3601         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3602                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3603                         0, 2, data, size);
3604         kfree(data);
3605         return rc;
3606 }
3607
3608 int
3609 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3610              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3611 {
3612         struct smb2_file_eof_info info;
3613         void *data;
3614         unsigned int size;
3615
3616         info.EndOfFile = *eof;
3617
3618         data = &info;
3619         size = sizeof(struct smb2_file_eof_info);
3620
3621         if (is_falloc)
3622                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3623                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3624                         0, 1, &data, &size);
3625         else
3626                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3627                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3628                         0, 1, &data, &size);
3629 }
3630
3631 int
3632 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3633               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3634 {
3635         unsigned int size;
3636         size = sizeof(FILE_BASIC_INFO);
3637         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3638                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3639                 0, 1, (void **)&buf, &size);
3640 }
3641
3642 int
3643 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3644                 u64 persistent_fid, u64 volatile_fid,
3645                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3646 {
3647         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3648                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3649                         1, (void **)&pnntsd, &pacllen);
3650 }
3651
3652 int
3653 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3654             u64 persistent_fid, u64 volatile_fid,
3655             struct smb2_file_full_ea_info *buf, int len)
3656 {
3657         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3658                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3659                 0, 1, (void **)&buf, &len);
3660 }
3661
3662 int
3663 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3664                   const u64 persistent_fid, const u64 volatile_fid,
3665                   __u8 oplock_level)
3666 {
3667         int rc;
3668         struct smb2_oplock_break *req = NULL;
3669         struct cifs_ses *ses = tcon->ses;
3670         int flags = CIFS_OBREAK_OP;
3671         unsigned int total_len;
3672         struct kvec iov[1];
3673         struct kvec rsp_iov;
3674         int resp_buf_type;
3675
3676         cifs_dbg(FYI, "SMB2_oplock_break\n");
3677         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3678                              &total_len);
3679         if (rc)
3680                 return rc;
3681
3682         if (smb3_encryption_required(tcon))
3683                 flags |= CIFS_TRANSFORM_REQ;
3684
3685         req->VolatileFid = volatile_fid;
3686         req->PersistentFid = persistent_fid;
3687         req->OplockLevel = oplock_level;
3688         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3689
3690         flags |= CIFS_NO_RESP;
3691
3692         iov[0].iov_base = (char *)req;
3693         iov[0].iov_len = total_len;
3694
3695         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3696         cifs_small_buf_release(req);
3697
3698         if (rc) {
3699                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3700                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3701         }
3702
3703         return rc;
3704 }
3705
3706 static void
3707 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3708                         struct kstatfs *kst)
3709 {
3710         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3711                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3712         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3713         kst->f_bfree  = kst->f_bavail =
3714                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3715         return;
3716 }
3717
3718 static int
3719 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3720                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3721 {
3722         struct TCP_Server_Info *server;
3723         int rc;
3724         struct smb2_query_info_req *req;
3725         unsigned int total_len;
3726
3727         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3728
3729         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3730                 return -EIO;
3731
3732         server = tcon->ses->server;
3733
3734         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3735                              &total_len);
3736         if (rc)
3737                 return rc;
3738
3739         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3740         req->FileInfoClass = level;
3741         req->PersistentFileId = persistent_fid;
3742         req->VolatileFileId = volatile_fid;
3743         /* 1 for pad */
3744         req->InputBufferOffset =
3745                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3746         req->OutputBufferLength = cpu_to_le32(
3747                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
3748
3749         iov->iov_base = (char *)req;
3750         iov->iov_len = total_len;
3751         return 0;
3752 }
3753
3754 int
3755 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3756               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3757 {
3758         struct smb2_query_info_rsp *rsp = NULL;
3759         struct kvec iov;
3760         struct kvec rsp_iov;
3761         int rc = 0;
3762         int resp_buftype;
3763         struct cifs_ses *ses = tcon->ses;
3764         struct smb2_fs_full_size_info *info = NULL;
3765         int flags = 0;
3766
3767         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3768                                 sizeof(struct smb2_fs_full_size_info),
3769                                 persistent_fid, volatile_fid);
3770         if (rc)
3771                 return rc;
3772
3773         if (smb3_encryption_required(tcon))
3774                 flags |= CIFS_TRANSFORM_REQ;
3775
3776         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3777         cifs_small_buf_release(iov.iov_base);
3778         if (rc) {
3779                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3780                 goto qfsinf_exit;
3781         }
3782         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3783
3784         info = (struct smb2_fs_full_size_info *)(
3785                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
3786         rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3787                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3788                           sizeof(struct smb2_fs_full_size_info));
3789         if (!rc)
3790                 copy_fs_info_to_kstatfs(info, fsdata);
3791
3792 qfsinf_exit:
3793         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3794         return rc;
3795 }
3796
3797 int
3798 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3799               u64 persistent_fid, u64 volatile_fid, int level)
3800 {
3801         struct smb2_query_info_rsp *rsp = NULL;
3802         struct kvec iov;
3803         struct kvec rsp_iov;
3804         int rc = 0;
3805         int resp_buftype, max_len, min_len;
3806         struct cifs_ses *ses = tcon->ses;
3807         unsigned int rsp_len, offset;
3808         int flags = 0;
3809
3810         if (level == FS_DEVICE_INFORMATION) {
3811                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3812                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3813         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3814                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3815                 min_len = MIN_FS_ATTR_INFO_SIZE;
3816         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3817                 max_len = sizeof(struct smb3_fs_ss_info);
3818                 min_len = sizeof(struct smb3_fs_ss_info);
3819         } else {
3820                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3821                 return -EINVAL;
3822         }
3823
3824         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3825                                 persistent_fid, volatile_fid);
3826         if (rc)
3827                 return rc;
3828
3829         if (smb3_encryption_required(tcon))
3830                 flags |= CIFS_TRANSFORM_REQ;
3831
3832         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3833         cifs_small_buf_release(iov.iov_base);
3834         if (rc) {
3835                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3836                 goto qfsattr_exit;
3837         }
3838         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3839
3840         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3841         offset = le16_to_cpu(rsp->OutputBufferOffset);
3842         rc = validate_iov(offset, rsp_len, &rsp_iov, min_len);
3843         if (rc)
3844                 goto qfsattr_exit;
3845
3846         if (level == FS_ATTRIBUTE_INFORMATION)
3847                 memcpy(&tcon->fsAttrInfo, offset
3848                         + (char *)rsp, min_t(unsigned int,
3849                         rsp_len, max_len));
3850         else if (level == FS_DEVICE_INFORMATION)
3851                 memcpy(&tcon->fsDevInfo, offset
3852                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
3853         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3854                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3855                         (offset + (char *)rsp);
3856                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3857                 tcon->perf_sector_size =
3858                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3859         }
3860
3861 qfsattr_exit:
3862         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3863         return rc;
3864 }
3865
3866 int
3867 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3868            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3869            const __u32 num_lock, struct smb2_lock_element *buf)
3870 {
3871         int rc = 0;
3872         struct smb2_lock_req *req = NULL;
3873         struct kvec iov[2];
3874         struct kvec rsp_iov;
3875         int resp_buf_type;
3876         unsigned int count;
3877         int flags = CIFS_NO_RESP;
3878         unsigned int total_len;
3879
3880         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3881
3882         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3883         if (rc)
3884                 return rc;
3885
3886         if (smb3_encryption_required(tcon))
3887                 flags |= CIFS_TRANSFORM_REQ;
3888
3889         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3890         req->LockCount = cpu_to_le16(num_lock);
3891
3892         req->PersistentFileId = persist_fid;
3893         req->VolatileFileId = volatile_fid;
3894
3895         count = num_lock * sizeof(struct smb2_lock_element);
3896
3897         iov[0].iov_base = (char *)req;
3898         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3899         iov[1].iov_base = (char *)buf;
3900         iov[1].iov_len = count;
3901
3902         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3903         rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3904                             &rsp_iov);
3905         cifs_small_buf_release(req);
3906         if (rc) {
3907                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3908                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3909                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
3910                                     tcon->ses->Suid, rc);
3911         }
3912
3913         return rc;
3914 }
3915
3916 int
3917 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3918           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3919           const __u64 length, const __u64 offset, const __u32 lock_flags,
3920           const bool wait)
3921 {
3922         struct smb2_lock_element lock;
3923
3924         lock.Offset = cpu_to_le64(offset);
3925         lock.Length = cpu_to_le64(length);
3926         lock.Flags = cpu_to_le32(lock_flags);
3927         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3928                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3929
3930         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3931 }
3932
3933 int
3934 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3935                  __u8 *lease_key, const __le32 lease_state)
3936 {
3937         int rc;
3938         struct smb2_lease_ack *req = NULL;
3939         struct cifs_ses *ses = tcon->ses;
3940         int flags = CIFS_OBREAK_OP;
3941         unsigned int total_len;
3942         struct kvec iov[1];
3943         struct kvec rsp_iov;
3944         int resp_buf_type;
3945
3946         cifs_dbg(FYI, "SMB2_lease_break\n");
3947         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3948                              &total_len);
3949         if (rc)
3950                 return rc;
3951
3952         if (smb3_encryption_required(tcon))
3953                 flags |= CIFS_TRANSFORM_REQ;
3954
3955         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3956         req->StructureSize = cpu_to_le16(36);
3957         total_len += 12;
3958
3959         memcpy(req->LeaseKey, lease_key, 16);
3960         req->LeaseState = lease_state;
3961
3962         flags |= CIFS_NO_RESP;
3963
3964         iov[0].iov_base = (char *)req;
3965         iov[0].iov_len = total_len;
3966
3967         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3968         cifs_small_buf_release(req);
3969
3970         if (rc) {
3971                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3972                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3973         }
3974
3975         return rc;
3976 }