fs/cifs/connect.c

   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/net.h>
  23 #include <linux/string.h>
  24 #include <linux/list.h>
  25 #include <linux/wait.h>
  26 #include <linux/ipv6.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/mempool.h>
  31 #include <linux/delay.h>
  32 #include <linux/completion.h>
  33 #include <linux/kthread.h>
  34 #include <linux/pagevec.h>
  35 #include <linux/freezer.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/processor.h>
  38 #include "cifspdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_unicode.h"
  42 #include "cifs_debug.h"
  43 #include "cifs_fs_sb.h"
  44 #include "ntlmssp.h"
  45 #include "nterr.h"
  46 #include "rfc1002pdu.h"
  47 #include "cn_cifs.h"
  48
  49 #define CIFS_PORT 445
  50 #define RFC1001_PORT 139
  51
  52 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  53                          unsigned char *p24);
  54
  55 extern mempool_t *cifs_req_poolp;
  56
  57 struct smb_vol {
  58         char *username;
  59         char *password;
  60         char *domainname;
  61         char *UNC;
  62         char *UNCip;
  63         char *in6_addr;   /* ipv6 address as human readable form of in6_addr */
  64         char *iocharset;  /* local code page for mapping to and from Unicode */
  65         char source_rfc1001_name[16]; /* netbios name of client */
  66         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  67         uid_t linux_uid;
  68         gid_t linux_gid;
  69         mode_t file_mode;
  70         mode_t dir_mode;
  71         unsigned secFlg;
  72         bool rw:1;
  73         bool retry:1;
  74         bool intr:1;
  75         bool setuids:1;
  76         bool override_uid:1;
  77         bool override_gid:1;
  78         bool dynperm:1;
  79         bool noperm:1;
  80         bool no_psx_acl:1; /* set if posix acl support should be disabled */
  81         bool cifs_acl:1;
  82         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
  83         bool server_ino:1; /* use inode numbers from server ie UniqueId */
  84         bool direct_io:1;
  85         bool remap:1;      /* set to remap seven reserved chars in filenames */
  86         bool posix_paths:1; /* unset to not ask for posix pathnames. */
  87         bool no_linux_ext:1;
  88         bool sfu_emul:1;
  89         bool nullauth:1;   /* attempt to authenticate with null user */
  90         bool nocase:1;     /* request case insensitive filenames */
  91         bool nobrl:1;      /* disable sending byte range locks to srv */
  92         bool seal:1;       /* request transport encryption on share */
  93         unsigned int rsize;
  94         unsigned int wsize;
  95         unsigned int sockopt;
  96         unsigned short int port;
  97         char *prepath;
  98 };
  99
 100 static int ipv4_connect(struct sockaddr_in *psin_server,
 101                         struct socket **csocket,
 102                         char *netb_name,
 103                         char *server_netb_name);
 104 static int ipv6_connect(struct sockaddr_in6 *psin_server,
 105                         struct socket **csocket);
 106
 107
 108         /*
 109          * cifs tcp session reconnection
 110          *
 111          * mark tcp session as reconnecting so temporarily locked
 112          * mark all smb sessions as reconnecting for tcp session
 113          * reconnect tcp session
 114          * wake up waiters on reconnection? - (not needed currently)
 115          */
 116
 117 static int
 118 cifs_reconnect(struct TCP_Server_Info *server)
 119 {
 120         int rc = 0;
 121         struct list_head *tmp;
 122         struct cifsSesInfo *ses;
 123         struct cifsTconInfo *tcon;
 124         struct mid_q_entry *mid_entry;
 125
 126         spin_lock(&GlobalMid_Lock);
 127         if (kthread_should_stop()) {
 128                 /* the demux thread will exit normally
 129                 next time through the loop */
 130                 spin_unlock(&GlobalMid_Lock);
 131                 return rc;
 132         } else
 133                 server->tcpStatus = CifsNeedReconnect;
 134         spin_unlock(&GlobalMid_Lock);
 135         server->maxBuf = 0;
 136
 137         cFYI(1, ("Reconnecting tcp session"));
 138
 139         /* before reconnecting the tcp session, mark the smb session (uid)
 140                 and the tid bad so they are not used until reconnected */
 141         read_lock(&GlobalSMBSeslock);
 142         list_for_each(tmp, &GlobalSMBSessionList) {
 143                 ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
 144                 if (ses->server) {
 145                         if (ses->server == server) {
 146                                 ses->status = CifsNeedReconnect;
 147                                 ses->ipc_tid = 0;
 148                         }
 149                 }
 150                 /* else tcp and smb sessions need reconnection */
 151         }
 152         list_for_each(tmp, &GlobalTreeConnectionList) {
 153                 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
 154                 if ((tcon) && (tcon->ses) && (tcon->ses->server == server))
 155                         tcon->tidStatus = CifsNeedReconnect;
 156         }
 157         read_unlock(&GlobalSMBSeslock);
 158         /* do not want to be sending data on a socket we are freeing */
 159         down(&server->tcpSem);
 160         if (server->ssocket) {
 161                 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
 162                         server->ssocket->flags));
 163                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 164                 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
 165                         server->ssocket->state,
 166                         server->ssocket->flags));
 167                 sock_release(server->ssocket);
 168                 server->ssocket = NULL;
 169         }
 170
 171         spin_lock(&GlobalMid_Lock);
 172         list_for_each(tmp, &server->pending_mid_q) {
 173                 mid_entry = list_entry(tmp, struct
 174                                         mid_q_entry,
 175                                         qhead);
 176                 if (mid_entry) {
 177                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 178                                 /* Mark other intransit requests as needing
 179                                    retry so we do not immediately mark the
 180                                    session bad again (ie after we reconnect
 181                                    below) as they timeout too */
 182                                 mid_entry->midState = MID_RETRY_NEEDED;
 183                         }
 184                 }
 185         }
 186         spin_unlock(&GlobalMid_Lock);
 187         up(&server->tcpSem);
 188
 189         while ((!kthread_should_stop()) && (server->tcpStatus != CifsGood)) {
 190                 try_to_freeze();
 191                 if (server->protocolType == IPV6) {
 192                         rc = ipv6_connect(&server->addr.sockAddr6,
 193                                           &server->ssocket);
 194                 } else {
 195                         rc = ipv4_connect(&server->addr.sockAddr,
 196                                         &server->ssocket,
 197                                         server->workstation_RFC1001_name,
 198                                         server->server_RFC1001_name);
 199                 }
 200                 if (rc) {
 201                         cFYI(1, ("reconnect error %d", rc));
 202                         msleep(3000);
 203                 } else {
 204                         atomic_inc(&tcpSesReconnectCount);
 205                         spin_lock(&GlobalMid_Lock);
 206                         if (!kthread_should_stop())
 207                                 server->tcpStatus = CifsGood;
 208                         server->sequence_number = 0;
 209                         spin_unlock(&GlobalMid_Lock);
 210         /*              atomic_set(&server->inFlight,0);*/
 211                         wake_up(&server->response_q);
 212                 }
 213         }
 214         return rc;
 215 }
 216
 217 /*
 218         return codes:
 219                 0       not a transact2, or all data present
 220                 >0      transact2 with that much data missing
 221                 -EINVAL = invalid transact2
 222
 223  */
 224 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 225 {
 226         struct smb_t2_rsp *pSMBt;
 227         int total_data_size;
 228         int data_in_this_rsp;
 229         int remaining;
 230
 231         if (pSMB->Command != SMB_COM_TRANSACTION2)
 232                 return 0;
 233
 234         /* check for plausible wct, bcc and t2 data and parm sizes */
 235         /* check for parm and data offset going beyond end of smb */
 236         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 237                 cFYI(1, ("invalid transact2 word count"));
 238                 return -EINVAL;
 239         }
 240
 241         pSMBt = (struct smb_t2_rsp *)pSMB;
 242
 243         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 244         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 245
 246         remaining = total_data_size - data_in_this_rsp;
 247
 248         if (remaining == 0)
 249                 return 0;
 250         else if (remaining < 0) {
 251                 cFYI(1, ("total data %d smaller than data in frame %d",
 252                         total_data_size, data_in_this_rsp));
 253                 return -EINVAL;
 254         } else {
 255                 cFYI(1, ("missing %d bytes from transact2, check next response",
 256                         remaining));
 257                 if (total_data_size > maxBufSize) {
 258                         cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
 259                                 total_data_size, maxBufSize));
 260                         return -EINVAL;
 261                 }
 262                 return remaining;
 263         }
 264 }
 265
 266 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 267 {
 268         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 269         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 270         int total_data_size;
 271         int total_in_buf;
 272         int remaining;
 273         int total_in_buf2;
 274         char *data_area_of_target;
 275         char *data_area_of_buf2;
 276         __u16 byte_count;
 277
 278         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 279
 280         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 281                 cFYI(1, ("total data size of primary and secondary t2 differ"));
 282         }
 283
 284         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 285
 286         remaining = total_data_size - total_in_buf;
 287
 288         if (remaining < 0)
 289                 return -EINVAL;
 290
 291         if (remaining == 0) /* nothing to do, ignore */
 292                 return 0;
 293
 294         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 295         if (remaining < total_in_buf2) {
 296                 cFYI(1, ("transact2 2nd response contains too much data"));
 297         }
 298
 299         /* find end of first SMB data area */
 300         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 301                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 302         /* validate target area */
 303
 304         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 305                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 306
 307         data_area_of_target += total_in_buf;
 308
 309         /* copy second buffer into end of first buffer */
 310         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 311         total_in_buf += total_in_buf2;
 312         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 313         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 314         byte_count += total_in_buf2;
 315         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 316
 317         byte_count = pTargetSMB->smb_buf_length;
 318         byte_count += total_in_buf2;
 319
 320         /* BB also add check that we are not beyond maximum buffer size */
 321
 322         pTargetSMB->smb_buf_length = byte_count;
 323
 324         if (remaining == total_in_buf2) {
 325                 cFYI(1, ("found the last secondary response"));
 326                 return 0; /* we are done */
 327         } else /* more responses to go */
 328                 return 1;
 329
 330 }
 331
 332 static int
 333 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 334 {
 335         int length;
 336         unsigned int pdu_length, total_read;
 337         struct smb_hdr *smb_buffer = NULL;
 338         struct smb_hdr *bigbuf = NULL;
 339         struct smb_hdr *smallbuf = NULL;
 340         struct msghdr smb_msg;
 341         struct kvec iov;
 342         struct socket *csocket = server->ssocket;
 343         struct list_head *tmp;
 344         struct cifsSesInfo *ses;
 345         struct task_struct *task_to_wake = NULL;
 346         struct mid_q_entry *mid_entry;
 347         char temp;
 348         bool isLargeBuf = false;
 349         bool isMultiRsp;
 350         int reconnect;
 351
 352         current->flags |= PF_MEMALLOC;
 353         cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
 354         write_lock(&GlobalSMBSeslock);
 355         atomic_inc(&tcpSesAllocCount);
 356         length = tcpSesAllocCount.counter;
 357         write_unlock(&GlobalSMBSeslock);
 358         if (length  > 1)
 359                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 360                                 GFP_KERNEL);
 361
 362         set_freezable();
 363         while (!kthread_should_stop()) {
 364                 if (try_to_freeze())
 365                         continue;
 366                 if (bigbuf == NULL) {
 367                         bigbuf = cifs_buf_get();
 368                         if (!bigbuf) {
 369                                 cERROR(1, ("No memory for large SMB response"));
 370                                 msleep(3000);
 371                                 /* retry will check if exiting */
 372                                 continue;
 373                         }
 374                 } else if (isLargeBuf) {
 375                         /* we are reusing a dirty large buf, clear its start */
 376                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 377                 }
 378
 379                 if (smallbuf == NULL) {
 380                         smallbuf = cifs_small_buf_get();
 381                         if (!smallbuf) {
 382                                 cERROR(1, ("No memory for SMB response"));
 383                                 msleep(1000);
 384                                 /* retry will check if exiting */
 385                                 continue;
 386                         }
 387                         /* beginning of smb buffer is cleared in our buf_get */
 388                 } else /* if existing small buf clear beginning */
 389                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 390
 391                 isLargeBuf = false;
 392                 isMultiRsp = false;
 393                 smb_buffer = smallbuf;
 394                 iov.iov_base = smb_buffer;
 395                 iov.iov_len = 4;
 396                 smb_msg.msg_control = NULL;
 397                 smb_msg.msg_controllen = 0;
 398                 pdu_length = 4; /* enough to get RFC1001 header */
 399 incomplete_rcv:
 400                 length =
 401                     kernel_recvmsg(csocket, &smb_msg,
 402                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 403
 404                 if (kthread_should_stop()) {
 405                         break;
 406                 } else if (server->tcpStatus == CifsNeedReconnect) {
 407                         cFYI(1, ("Reconnect after server stopped responding"));
 408                         cifs_reconnect(server);
 409                         cFYI(1, ("call to reconnect done"));
 410                         csocket = server->ssocket;
 411                         continue;
 412                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 413                         msleep(1); /* minimum sleep to prevent looping
 414                                 allowing socket to clear and app threads to set
 415                                 tcpStatus CifsNeedReconnect if server hung */
 416                         if (pdu_length < 4)
 417                                 goto incomplete_rcv;
 418                         else
 419                                 continue;
 420                 } else if (length <= 0) {
 421                         if (server->tcpStatus == CifsNew) {
 422                                 cFYI(1, ("tcp session abend after SMBnegprot"));
 423                                 /* some servers kill the TCP session rather than
 424                                    returning an SMB negprot error, in which
 425                                    case reconnecting here is not going to help,
 426                                    and so simply return error to mount */
 427                                 break;
 428                         }
 429                         if (!try_to_freeze() && (length == -EINTR)) {
 430                                 cFYI(1, ("cifsd thread killed"));
 431                                 break;
 432                         }
 433                         cFYI(1, ("Reconnect after unexpected peek error %d",
 434                                 length));
 435                         cifs_reconnect(server);
 436                         csocket = server->ssocket;
 437                         wake_up(&server->response_q);
 438                         continue;
 439                 } else if (length < pdu_length) {
 440                         cFYI(1, ("requested %d bytes but only got %d bytes",
 441                                   pdu_length, length));
 442                         pdu_length -= length;
 443                         msleep(1);
 444                         goto incomplete_rcv;
 445                 }
 446
 447                 /* The right amount was read from socket - 4 bytes */
 448                 /* so we can now interpret the length field */
 449
 450                 /* the first byte big endian of the length field,
 451                 is actually not part of the length but the type
 452                 with the most common, zero, as regular data */
 453                 temp = *((char *) smb_buffer);
 454
 455                 /* Note that FC 1001 length is big endian on the wire,
 456                 but we convert it here so it is always manipulated
 457                 as host byte order */
 458                 pdu_length = ntohl(smb_buffer->smb_buf_length);
 459                 smb_buffer->smb_buf_length = pdu_length;
 460
 461                 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
 462
 463                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 464                         continue;
 465                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 466                         cFYI(1, ("Good RFC 1002 session rsp"));
 467                         continue;
 468                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 469                         /* we get this from Windows 98 instead of
 470                            an error on SMB negprot response */
 471                         cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
 472                                 pdu_length));
 473                         if (server->tcpStatus == CifsNew) {
 474                                 /* if nack on negprot (rather than
 475                                 ret of smb negprot error) reconnecting
 476                                 not going to help, ret error to mount */
 477                                 break;
 478                         } else {
 479                                 /* give server a second to
 480                                 clean up before reconnect attempt */
 481                                 msleep(1000);
 482                                 /* always try 445 first on reconnect
 483                                 since we get NACK on some if we ever
 484                                 connected to port 139 (the NACK is
 485                                 since we do not begin with RFC1001
 486                                 session initialize frame) */
 487                                 server->addr.sockAddr.sin_port =
 488                                         htons(CIFS_PORT);
 489                                 cifs_reconnect(server);
 490                                 csocket = server->ssocket;
 491                                 wake_up(&server->response_q);
 492                                 continue;
 493                         }
 494                 } else if (temp != (char) 0) {
 495                         cERROR(1, ("Unknown RFC 1002 frame"));
 496                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 497                                       length);
 498                         cifs_reconnect(server);
 499                         csocket = server->ssocket;
 500                         continue;
 501                 }
 502
 503                 /* else we have an SMB response */
 504                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 505                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 506                         cERROR(1, ("Invalid size SMB length %d pdu_length %d",
 507                                         length, pdu_length+4));
 508                         cifs_reconnect(server);
 509                         csocket = server->ssocket;
 510                         wake_up(&server->response_q);
 511                         continue;
 512                 }
 513
 514                 /* else length ok */
 515                 reconnect = 0;
 516
 517                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 518                         isLargeBuf = true;
 519                         memcpy(bigbuf, smallbuf, 4);
 520                         smb_buffer = bigbuf;
 521                 }
 522                 length = 0;
 523                 iov.iov_base = 4 + (char *)smb_buffer;
 524                 iov.iov_len = pdu_length;
 525                 for (total_read = 0; total_read < pdu_length;
 526                      total_read += length) {
 527                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 528                                                 pdu_length - total_read, 0);
 529                         if (kthread_should_stop() ||
 530                             (length == -EINTR)) {
 531                                 /* then will exit */
 532                                 reconnect = 2;
 533                                 break;
 534                         } else if (server->tcpStatus == CifsNeedReconnect) {
 535                                 cifs_reconnect(server);
 536                                 csocket = server->ssocket;
 537                                 /* Reconnect wakes up rspns q */
 538                                 /* Now we will reread sock */
 539                                 reconnect = 1;
 540                                 break;
 541                         } else if ((length == -ERESTARTSYS) ||
 542                                    (length == -EAGAIN)) {
 543                                 msleep(1); /* minimum sleep to prevent looping,
 544                                               allowing socket to clear and app
 545                                               threads to set tcpStatus
 546                                               CifsNeedReconnect if server hung*/
 547                                 length = 0;
 548                                 continue;
 549                         } else if (length <= 0) {
 550                                 cERROR(1, ("Received no data, expecting %d",
 551                                               pdu_length - total_read));
 552                                 cifs_reconnect(server);
 553                                 csocket = server->ssocket;
 554                                 reconnect = 1;
 555                                 break;
 556                         }
 557                 }
 558                 if (reconnect == 2)
 559                         break;
 560                 else if (reconnect == 1)
 561                         continue;
 562
 563                 length += 4; /* account for rfc1002 hdr */
 564
 565
 566                 dump_smb(smb_buffer, length);
 567                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 568                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 569                         continue;
 570                 }
 571
 572
 573                 task_to_wake = NULL;
 574                 spin_lock(&GlobalMid_Lock);
 575                 list_for_each(tmp, &server->pending_mid_q) {
 576                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 577
 578                         if ((mid_entry->mid == smb_buffer->Mid) &&
 579                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 580                             (mid_entry->command == smb_buffer->Command)) {
 581                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 582                                         /* We have a multipart transact2 resp */
 583                                         isMultiRsp = true;
 584                                         if (mid_entry->resp_buf) {
 585                                                 /* merge response - fix up 1st*/
 586                                                 if (coalesce_t2(smb_buffer,
 587                                                         mid_entry->resp_buf)) {
 588                                                         mid_entry->multiRsp =
 589                                                                  true;
 590                                                         break;
 591                                                 } else {
 592                                                         /* all parts received */
 593                                                         mid_entry->multiEnd =
 594                                                                  true;
 595                                                         goto multi_t2_fnd;
 596                                                 }
 597                                         } else {
 598                                                 if (!isLargeBuf) {
 599                                                         cERROR(1,("1st trans2 resp needs bigbuf"));
 600                                         /* BB maybe we can fix this up,  switch
 601                                            to already allocated large buffer? */
 602                                                 } else {
 603                                                         /* Have first buffer */
 604                                                         mid_entry->resp_buf =
 605                                                                  smb_buffer;
 606                                                         mid_entry->largeBuf =
 607                                                                  true;
 608                                                         bigbuf = NULL;
 609                                                 }
 610                                         }
 611                                         break;
 612                                 }
 613                                 mid_entry->resp_buf = smb_buffer;
 614                                 mid_entry->largeBuf = isLargeBuf;
 615 multi_t2_fnd:
 616                                 task_to_wake = mid_entry->tsk;
 617                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 618 #ifdef CONFIG_CIFS_STATS2
 619                                 mid_entry->when_received = jiffies;
 620 #endif
 621                                 /* so we do not time out requests to  server
 622                                 which is still responding (since server could
 623                                 be busy but not dead) */
 624                                 server->lstrp = jiffies;
 625                                 break;
 626                         }
 627                 }
 628                 spin_unlock(&GlobalMid_Lock);
 629                 if (task_to_wake) {
 630                         /* Was previous buf put in mpx struct for multi-rsp? */
 631                         if (!isMultiRsp) {
 632                                 /* smb buffer will be freed by user thread */
 633                                 if (isLargeBuf)
 634                                         bigbuf = NULL;
 635                                 else
 636                                         smallbuf = NULL;
 637                         }
 638                         wake_up_process(task_to_wake);
 639                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 640                            !isMultiRsp) {
 641                         cERROR(1, ("No task to wake, unknown frame received! "
 642                                    "NumMids %d", midCount.counter));
 643                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 644                                       sizeof(struct smb_hdr));
 645 #ifdef CONFIG_CIFS_DEBUG2
 646                         cifs_dump_detail(smb_buffer);
 647                         cifs_dump_mids(server);
 648 #endif /* CIFS_DEBUG2 */
 649
 650                 }
 651         } /* end while !EXITING */
 652
 653         spin_lock(&GlobalMid_Lock);
 654         server->tcpStatus = CifsExiting;
 655         spin_unlock(&GlobalMid_Lock);
 656         wake_up_all(&server->response_q);
 657
 658         /* don't exit until kthread_stop is called */
 659         set_current_state(TASK_UNINTERRUPTIBLE);
 660         while (!kthread_should_stop()) {
 661                 schedule();
 662                 set_current_state(TASK_UNINTERRUPTIBLE);
 663         }
 664         set_current_state(TASK_RUNNING);
 665
 666         /* check if we have blocked requests that need to free */
 667         /* Note that cifs_max_pending is normally 50, but
 668         can be set at module install time to as little as two */
 669         spin_lock(&GlobalMid_Lock);
 670         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 671                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 672         /* We do not want to set the max_pending too low or we
 673         could end up with the counter going negative */
 674         spin_unlock(&GlobalMid_Lock);
 675         /* Although there should not be any requests blocked on
 676         this queue it can not hurt to be paranoid and try to wake up requests
 677         that may haven been blocked when more than 50 at time were on the wire
 678         to the same server - they now will see the session is in exit state
 679         and get out of SendReceive.  */
 680         wake_up_all(&server->request_q);
 681         /* give those requests time to exit */
 682         msleep(125);
 683
 684         if (server->ssocket) {
 685                 sock_release(csocket);
 686                 server->ssocket = NULL;
 687         }
 688         /* buffer usuallly freed in free_mid - need to free it here on exit */
 689         cifs_buf_release(bigbuf);
 690         if (smallbuf) /* no sense logging a debug message if NULL */
 691                 cifs_small_buf_release(smallbuf);
 692
 693         read_lock(&GlobalSMBSeslock);
 694         if (list_empty(&server->pending_mid_q)) {
 695                 /* loop through server session structures attached to this and
 696                     mark them dead */
 697                 list_for_each(tmp, &GlobalSMBSessionList) {
 698                         ses =
 699                             list_entry(tmp, struct cifsSesInfo,
 700                                        cifsSessionList);
 701                         if (ses->server == server) {
 702                                 ses->status = CifsExiting;
 703                                 ses->server = NULL;
 704                         }
 705                 }
 706                 read_unlock(&GlobalSMBSeslock);
 707         } else {
 708                 /* although we can not zero the server struct pointer yet,
 709                 since there are active requests which may depnd on them,
 710                 mark the corresponding SMB sessions as exiting too */
 711                 list_for_each(tmp, &GlobalSMBSessionList) {
 712                         ses = list_entry(tmp, struct cifsSesInfo,
 713                                          cifsSessionList);
 714                         if (ses->server == server)
 715                                 ses->status = CifsExiting;
 716                 }
 717
 718                 spin_lock(&GlobalMid_Lock);
 719                 list_for_each(tmp, &server->pending_mid_q) {
 720                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 721                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 722                                 cFYI(1, ("Clearing Mid 0x%x - waking up ",
 723                                          mid_entry->mid));
 724                                 task_to_wake = mid_entry->tsk;
 725                                 if (task_to_wake)
 726                                         wake_up_process(task_to_wake);
 727                         }
 728                 }
 729                 spin_unlock(&GlobalMid_Lock);
 730                 read_unlock(&GlobalSMBSeslock);
 731                 /* 1/8th of sec is more than enough time for them to exit */
 732                 msleep(125);
 733         }
 734
 735         if (!list_empty(&server->pending_mid_q)) {
 736                 /* mpx threads have not exited yet give them
 737                 at least the smb send timeout time for long ops */
 738                 /* due to delays on oplock break requests, we need
 739                 to wait at least 45 seconds before giving up
 740                 on a request getting a response and going ahead
 741                 and killing cifsd */
 742                 cFYI(1, ("Wait for exit from demultiplex thread"));
 743                 msleep(46000);
 744                 /* if threads still have not exited they are probably never
 745                 coming home not much else we can do but free the memory */
 746         }
 747
 748         write_lock(&GlobalSMBSeslock);
 749         atomic_dec(&tcpSesAllocCount);
 750         length = tcpSesAllocCount.counter;
 751
 752         /* last chance to mark ses pointers invalid
 753         if there are any pointing to this (e.g
 754         if a crazy root user tried to kill cifsd
 755         kernel thread explicitly this might happen) */
 756         list_for_each(tmp, &GlobalSMBSessionList) {
 757                 ses = list_entry(tmp, struct cifsSesInfo,
 758                                 cifsSessionList);
 759                 if (ses->server == server)
 760                         ses->server = NULL;
 761         }
 762         write_unlock(&GlobalSMBSeslock);
 763
 764         kfree(server->hostname);
 765         kfree(server);
 766         if (length  > 0)
 767                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 768                                 GFP_KERNEL);
 769
 770         return 0;
 771 }
 772
 773 /* extract the host portion of the UNC string */
 774 static char *
 775 extract_hostname(const char *unc)
 776 {
 777         const char *src;
 778         char *dst, *delim;
 779         unsigned int len;
 780
 781         /* skip double chars at beginning of string */
 782         /* BB: check validity of these bytes? */
 783         src = unc + 2;
 784
 785         /* delimiter between hostname and sharename is always '\\' now */
 786         delim = strchr(src, '\\');
 787         if (!delim)
 788                 return ERR_PTR(-EINVAL);
 789
 790         len = delim - src;
 791         dst = kmalloc((len + 1), GFP_KERNEL);
 792         if (dst == NULL)
 793                 return ERR_PTR(-ENOMEM);
 794
 795         memcpy(dst, src, len);
 796         dst[len] = '\0';
 797
 798         return dst;
 799 }
 800
 801 static int
 802 cifs_parse_mount_options(char *options, const char *devname,
 803                          struct smb_vol *vol)
 804 {
 805         char *value;
 806         char *data;
 807         unsigned int  temp_len, i, j;
 808         char separator[2];
 809
 810         separator[0] = ',';
 811         separator[1] = 0;
 812
 813         if (Local_System_Name[0] != 0)
 814                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 815         else {
 816                 char *nodename = utsname()->nodename;
 817                 int n = strnlen(nodename, 15);
 818                 memset(vol->source_rfc1001_name, 0x20, 15);
 819                 for (i = 0; i < n; i++) {
 820                         /* does not have to be perfect mapping since field is
 821                         informational, only used for servers that do not support
 822                         port 445 and it can be overridden at mount time */
 823                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 824                 }
 825         }
 826         vol->source_rfc1001_name[15] = 0;
 827         /* null target name indicates to use *SMBSERVR default called name
 828            if we end up sending RFC1001 session initialize */
 829         vol->target_rfc1001_name[0] = 0;
 830         vol->linux_uid = current->uid;  /* current->euid instead? */
 831         vol->linux_gid = current->gid;
 832         vol->dir_mode = S_IRWXUGO;
 833         /* 2767 perms indicate mandatory locking support */
 834         vol->file_mode = (S_IRWXUGO | S_ISGID) & (~S_IXGRP);
 835
 836         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 837         vol->rw = true;
 838         /* default is always to request posix paths. */
 839         vol->posix_paths = 1;
 840
 841         if (!options)
 842                 return 1;
 843
 844         if (strncmp(options, "sep=", 4) == 0) {
 845                 if (options[4] != 0) {
 846                         separator[0] = options[4];
 847                         options += 5;
 848                 } else {
 849                         cFYI(1, ("Null separator not allowed"));
 850                 }
 851         }
 852
 853         while ((data = strsep(&options, separator)) != NULL) {
 854                 if (!*data)
 855                         continue;
 856                 if ((value = strchr(data, '=')) != NULL)
 857                         *value++ = '\0';
 858
 859                 /* Have to parse this before we parse for "user" */
 860                 if (strnicmp(data, "user_xattr", 10) == 0) {
 861                         vol->no_xattr = 0;
 862                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 863                         vol->no_xattr = 1;
 864                 } else if (strnicmp(data, "user", 4) == 0) {
 865                         if (!value) {
 866                                 printk(KERN_WARNING
 867                                        "CIFS: invalid or missing username\n");
 868                                 return 1;       /* needs_arg; */
 869                         } else if (!*value) {
 870                                 /* null user, ie anonymous, authentication */
 871                                 vol->nullauth = 1;
 872                         }
 873                         if (strnlen(value, 200) < 200) {
 874                                 vol->username = value;
 875                         } else {
 876                                 printk(KERN_WARNING "CIFS: username too long\n");
 877                                 return 1;
 878                         }
 879                 } else if (strnicmp(data, "pass", 4) == 0) {
 880                         if (!value) {
 881                                 vol->password = NULL;
 882                                 continue;
 883                         } else if (value[0] == 0) {
 884                                 /* check if string begins with double comma
 885                                    since that would mean the password really
 886                                    does start with a comma, and would not
 887                                    indicate an empty string */
 888                                 if (value[1] != separator[0]) {
 889                                         vol->password = NULL;
 890                                         continue;
 891                                 }
 892                         }
 893                         temp_len = strlen(value);
 894                         /* removed password length check, NTLM passwords
 895                                 can be arbitrarily long */
 896
 897                         /* if comma in password, the string will be
 898                         prematurely null terminated.  Commas in password are
 899                         specified across the cifs mount interface by a double
 900                         comma ie ,, and a comma used as in other cases ie ','
 901                         as a parameter delimiter/separator is single and due
 902                         to the strsep above is temporarily zeroed. */
 903
 904                         /* NB: password legally can have multiple commas and
 905                         the only illegal character in a password is null */
 906
 907                         if ((value[temp_len] == 0) &&
 908                             (value[temp_len+1] == separator[0])) {
 909                                 /* reinsert comma */
 910                                 value[temp_len] = separator[0];
 911                                 temp_len += 2;  /* move after second comma */
 912                                 while (value[temp_len] != 0)  {
 913                                         if (value[temp_len] == separator[0]) {
 914                                                 if (value[temp_len+1] ==
 915                                                      separator[0]) {
 916                                                 /* skip second comma */
 917                                                         temp_len++;
 918                                                 } else {
 919                                                 /* single comma indicating start
 920                                                          of next parm */
 921                                                         break;
 922                                                 }
 923                                         }
 924                                         temp_len++;
 925                                 }
 926                                 if (value[temp_len] == 0) {
 927                                         options = NULL;
 928                                 } else {
 929                                         value[temp_len] = 0;
 930                                         /* point option to start of next parm */
 931                                         options = value + temp_len + 1;
 932                                 }
 933                                 /* go from value to value + temp_len condensing
 934                                 double commas to singles. Note that this ends up
 935                                 allocating a few bytes too many, which is ok */
 936                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 937                                 if (vol->password == NULL) {
 938                                         printk(KERN_WARNING "CIFS: no memory "
 939                                                             "for password\n");
 940                                         return 1;
 941                                 }
 942                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 943                                         vol->password[j] = value[i];
 944                                         if (value[i] == separator[0]
 945                                                 && value[i+1] == separator[0]) {
 946                                                 /* skip second comma */
 947                                                 i++;
 948                                         }
 949                                 }
 950                                 vol->password[j] = 0;
 951                         } else {
 952                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 953                                 if (vol->password == NULL) {
 954                                         printk(KERN_WARNING "CIFS: no memory "
 955                                                             "for password\n");
 956                                         return 1;
 957                                 }
 958                                 strcpy(vol->password, value);
 959                         }
 960                 } else if (strnicmp(data, "ip", 2) == 0) {
 961                         if (!value || !*value) {
 962                                 vol->UNCip = NULL;
 963                         } else if (strnlen(value, 35) < 35) {
 964                                 vol->UNCip = value;
 965                         } else {
 966                                 printk(KERN_WARNING "CIFS: ip address "
 967                                                     "too long\n");
 968                                 return 1;
 969                         }
 970                 } else if (strnicmp(data, "sec", 3) == 0) {
 971                         if (!value || !*value) {
 972                                 cERROR(1, ("no security value specified"));
 973                                 continue;
 974                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 975                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 976                                         CIFSSEC_MUST_SIGN;
 977                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 978                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 979                                         CIFSSEC_MAY_KRB5; */
 980                                 cERROR(1, ("Krb5 cifs privacy not supported"));
 981                                 return 1;
 982                         } else if (strnicmp(value, "krb5", 4) == 0) {
 983                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 984                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 985                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 986                                         CIFSSEC_MUST_SIGN;
 987                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 988                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 989                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
 990                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
 991                                         CIFSSEC_MUST_SIGN;
 992                         } else if (strnicmp(value, "ntlm", 4) == 0) {
 993                                 /* ntlm is default so can be turned off too */
 994                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
 995                         } else if (strnicmp(value, "nontlm", 6) == 0) {
 996                                 /* BB is there a better way to do this? */
 997                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 998 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 999                         } else if (strnicmp(value, "lanman", 6) == 0) {
1000                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1001 #endif
1002                         } else if (strnicmp(value, "none", 4) == 0) {
1003                                 vol->nullauth = 1;
1004                         } else {
1005                                 cERROR(1, ("bad security option: %s", value));
1006                                 return 1;
1007                         }
1008                 } else if ((strnicmp(data, "unc", 3) == 0)
1009                            || (strnicmp(data, "target", 6) == 0)
1010                            || (strnicmp(data, "path", 4) == 0)) {
1011                         if (!value || !*value) {
1012                                 printk(KERN_WARNING "CIFS: invalid path to "
1013                                                     "network resource\n");
1014                                 return 1;       /* needs_arg; */
1015                         }
1016                         if ((temp_len = strnlen(value, 300)) < 300) {
1017                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1018                                 if (vol->UNC == NULL)
1019                                         return 1;
1020                                 strcpy(vol->UNC, value);
1021                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1022                                         vol->UNC[0] = '\\';
1023                                         vol->UNC[1] = '\\';
1024                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1025                                         printk(KERN_WARNING
1026                                                "CIFS: UNC Path does not begin "
1027                                                "with // or \\\\ \n");
1028                                         return 1;
1029                                 }
1030                         } else {
1031                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1032                                 return 1;
1033                         }
1034                 } else if ((strnicmp(data, "domain", 3) == 0)
1035                            || (strnicmp(data, "workgroup", 5) == 0)) {
1036                         if (!value || !*value) {
1037                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1038                                 return 1;       /* needs_arg; */
1039                         }
1040                         /* BB are there cases in which a comma can be valid in
1041                         a domain name and need special handling? */
1042                         if (strnlen(value, 256) < 256) {
1043                                 vol->domainname = value;
1044                                 cFYI(1, ("Domain name set"));
1045                         } else {
1046                                 printk(KERN_WARNING "CIFS: domain name too "
1047                                                     "long\n");
1048                                 return 1;
1049                         }
1050                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1051                         if (!value || !*value) {
1052                                 printk(KERN_WARNING
1053                                         "CIFS: invalid path prefix\n");
1054                                 return 1;       /* needs_argument */
1055                         }
1056                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1057                                 if (value[0] != '/')
1058                                         temp_len++;  /* missing leading slash */
1059                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1060                                 if (vol->prepath == NULL)
1061                                         return 1;
1062                                 if (value[0] != '/') {
1063                                         vol->prepath[0] = '/';
1064                                         strcpy(vol->prepath+1, value);
1065                                 } else
1066                                         strcpy(vol->prepath, value);
1067                                 cFYI(1, ("prefix path %s", vol->prepath));
1068                         } else {
1069                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1070                                 return 1;
1071                         }
1072                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1073                         if (!value || !*value) {
1074                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1075                                                     "specified\n");
1076                                 return 1;       /* needs_arg; */
1077                         }
1078                         if (strnlen(value, 65) < 65) {
1079                                 if (strnicmp(value, "default", 7))
1080                                         vol->iocharset = value;
1081                                 /* if iocharset not set then load_nls_default
1082                                    is used by caller */
1083                                 cFYI(1, ("iocharset set to %s", value));
1084                         } else {
1085                                 printk(KERN_WARNING "CIFS: iocharset name "
1086                                                     "too long.\n");
1087                                 return 1;
1088                         }
1089                 } else if (strnicmp(data, "uid", 3) == 0) {
1090                         if (value && *value) {
1091                                 vol->linux_uid =
1092                                         simple_strtoul(value, &value, 0);
1093                                 vol->override_uid = 1;
1094                         }
1095                 } else if (strnicmp(data, "gid", 3) == 0) {
1096                         if (value && *value) {
1097                                 vol->linux_gid =
1098                                         simple_strtoul(value, &value, 0);
1099                                 vol->override_gid = 1;
1100                         }
1101                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1102                         if (value && *value) {
1103                                 vol->file_mode =
1104                                         simple_strtoul(value, &value, 0);
1105                         }
1106                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1107                         if (value && *value) {
1108                                 vol->dir_mode =
1109                                         simple_strtoul(value, &value, 0);
1110                         }
1111                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1112                         if (value && *value) {
1113                                 vol->dir_mode =
1114                                         simple_strtoul(value, &value, 0);
1115                         }
1116                 } else if (strnicmp(data, "port", 4) == 0) {
1117                         if (value && *value) {
1118                                 vol->port =
1119                                         simple_strtoul(value, &value, 0);
1120                         }
1121                 } else if (strnicmp(data, "rsize", 5) == 0) {
1122                         if (value && *value) {
1123                                 vol->rsize =
1124                                         simple_strtoul(value, &value, 0);
1125                         }
1126                 } else if (strnicmp(data, "wsize", 5) == 0) {
1127                         if (value && *value) {
1128                                 vol->wsize =
1129                                         simple_strtoul(value, &value, 0);
1130                         }
1131                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1132                         if (value && *value) {
1133                                 vol->sockopt =
1134                                         simple_strtoul(value, &value, 0);
1135                         }
1136                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1137                         if (!value || !*value || (*value == ' ')) {
1138                                 cFYI(1, ("invalid (empty) netbiosname"));
1139                         } else {
1140                                 memset(vol->source_rfc1001_name, 0x20, 15);
1141                                 for (i = 0; i < 15; i++) {
1142                                 /* BB are there cases in which a comma can be
1143                                 valid in this workstation netbios name (and need
1144                                 special handling)? */
1145
1146                                 /* We do not uppercase netbiosname for user */
1147                                         if (value[i] == 0)
1148                                                 break;
1149                                         else
1150                                                 vol->source_rfc1001_name[i] =
1151                                                                 value[i];
1152                                 }
1153                                 /* The string has 16th byte zero still from
1154                                 set at top of the function  */
1155                                 if ((i == 15) && (value[i] != 0))
1156                                         printk(KERN_WARNING "CIFS: netbiosname"
1157                                                 " longer than 15 truncated.\n");
1158                         }
1159                 } else if (strnicmp(data, "servern", 7) == 0) {
1160                         /* servernetbiosname specified override *SMBSERVER */
1161                         if (!value || !*value || (*value == ' ')) {
1162                                 cFYI(1, ("empty server netbiosname specified"));
1163                         } else {
1164                                 /* last byte, type, is 0x20 for servr type */
1165                                 memset(vol->target_rfc1001_name, 0x20, 16);
1166
1167                                 for (i = 0; i < 15; i++) {
1168                                 /* BB are there cases in which a comma can be
1169                                    valid in this workstation netbios name
1170                                    (and need special handling)? */
1171
1172                                 /* user or mount helper must uppercase
1173                                    the netbiosname */
1174                                         if (value[i] == 0)
1175                                                 break;
1176                                         else
1177                                                 vol->target_rfc1001_name[i] =
1178                                                                 value[i];
1179                                 }
1180                                 /* The string has 16th byte zero still from
1181                                    set at top of the function  */
1182                                 if ((i == 15) && (value[i] != 0))
1183                                         printk(KERN_WARNING "CIFS: server net"
1184                                         "biosname longer than 15 truncated.\n");
1185                         }
1186                 } else if (strnicmp(data, "credentials", 4) == 0) {
1187                         /* ignore */
1188                 } else if (strnicmp(data, "version", 3) == 0) {
1189                         /* ignore */
1190                 } else if (strnicmp(data, "guest", 5) == 0) {
1191                         /* ignore */
1192                 } else if (strnicmp(data, "rw", 2) == 0) {
1193                         vol->rw = true;
1194                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1195                                    (strnicmp(data, "nosuid", 6) == 0) ||
1196                                    (strnicmp(data, "exec", 4) == 0) ||
1197                                    (strnicmp(data, "noexec", 6) == 0) ||
1198                                    (strnicmp(data, "nodev", 5) == 0) ||
1199                                    (strnicmp(data, "noauto", 6) == 0) ||
1200                                    (strnicmp(data, "dev", 3) == 0)) {
1201                         /*  The mount tool or mount.cifs helper (if present)
1202                             uses these opts to set flags, and the flags are read
1203                             by the kernel vfs layer before we get here (ie
1204                             before read super) so there is no point trying to
1205                             parse these options again and set anything and it
1206                             is ok to just ignore them */
1207                         continue;
1208                 } else if (strnicmp(data, "ro", 2) == 0) {
1209                         vol->rw = false;
1210                 } else if (strnicmp(data, "hard", 4) == 0) {
1211                         vol->retry = 1;
1212                 } else if (strnicmp(data, "soft", 4) == 0) {
1213                         vol->retry = 0;
1214                 } else if (strnicmp(data, "perm", 4) == 0) {
1215                         vol->noperm = 0;
1216                 } else if (strnicmp(data, "noperm", 6) == 0) {
1217                         vol->noperm = 1;
1218                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1219                         vol->remap = 1;
1220                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1221                         vol->remap = 0;
1222                 } else if (strnicmp(data, "sfu", 3) == 0) {
1223                         vol->sfu_emul = 1;
1224                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1225                         vol->sfu_emul = 0;
1226                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1227                         vol->posix_paths = 1;
1228                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1229                         vol->posix_paths = 0;
1230                 } else if (strnicmp(data, "nounix", 6) == 0) {
1231                         vol->no_linux_ext = 1;
1232                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1233                         vol->no_linux_ext = 1;
1234                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1235                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1236                         vol->nocase = 1;
1237                 } else if (strnicmp(data, "brl", 3) == 0) {
1238                         vol->nobrl =  0;
1239                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1240                            (strnicmp(data, "nolock", 6) == 0)) {
1241                         vol->nobrl =  1;
1242                         /* turn off mandatory locking in mode
1243                         if remote locking is turned off since the
1244                         local vfs will do advisory */
1245                         if (vol->file_mode ==
1246                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1247                                 vol->file_mode = S_IALLUGO;
1248                 } else if (strnicmp(data, "setuids", 7) == 0) {
1249                         vol->setuids = 1;
1250                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1251                         vol->setuids = 0;
1252                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1253                         vol->dynperm = true;
1254                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1255                         vol->dynperm = false;
1256                 } else if (strnicmp(data, "nohard", 6) == 0) {
1257                         vol->retry = 0;
1258                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1259                         vol->retry = 1;
1260                 } else if (strnicmp(data, "nointr", 6) == 0) {
1261                         vol->intr = 0;
1262                 } else if (strnicmp(data, "intr", 4) == 0) {
1263                         vol->intr = 1;
1264                 } else if (strnicmp(data, "serverino", 7) == 0) {
1265                         vol->server_ino = 1;
1266                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1267                         vol->server_ino = 0;
1268                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1269                         vol->cifs_acl = 1;
1270                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1271                         vol->cifs_acl = 0;
1272                 } else if (strnicmp(data, "acl", 3) == 0) {
1273                         vol->no_psx_acl = 0;
1274                 } else if (strnicmp(data, "noacl", 5) == 0) {
1275                         vol->no_psx_acl = 1;
1276                 } else if (strnicmp(data, "sign", 4) == 0) {
1277                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1278                 } else if (strnicmp(data, "seal", 4) == 0) {
1279                         /* we do not do the following in secFlags because seal
1280                            is a per tree connection (mount) not a per socket
1281                            or per-smb connection option in the protocol */
1282                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1283                         vol->seal = 1;
1284                 } else if (strnicmp(data, "direct", 6) == 0) {
1285                         vol->direct_io = 1;
1286                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1287                         vol->direct_io = 1;
1288                 } else if (strnicmp(data, "in6_addr", 8) == 0) {
1289                         if (!value || !*value) {
1290                                 vol->in6_addr = NULL;
1291                         } else if (strnlen(value, 49) == 48) {
1292                                 vol->in6_addr = value;
1293                         } else {
1294                                 printk(KERN_WARNING "CIFS: ip v6 address not "
1295                                                     "48 characters long\n");
1296                                 return 1;
1297                         }
1298                 } else if (strnicmp(data, "noac", 4) == 0) {
1299                         printk(KERN_WARNING "CIFS: Mount option noac not "
1300                                 "supported. Instead set "
1301                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1302                 } else
1303                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1304                                                 data);
1305         }
1306         if (vol->UNC == NULL) {
1307                 if (devname == NULL) {
1308                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1309                                                 "target\n");
1310                         return 1;
1311                 }
1312                 if ((temp_len = strnlen(devname, 300)) < 300) {
1313                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1314                         if (vol->UNC == NULL)
1315                                 return 1;
1316                         strcpy(vol->UNC, devname);
1317                         if (strncmp(vol->UNC, "//", 2) == 0) {
1318                                 vol->UNC[0] = '\\';
1319                                 vol->UNC[1] = '\\';
1320                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1321                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1322                                                     "begin with // or \\\\ \n");
1323                                 return 1;
1324                         }
1325                         value = strpbrk(vol->UNC+2, "/\\");
1326                         if (value)
1327                                 *value = '\\';
1328                 } else {
1329                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1330                         return 1;
1331                 }
1332         }
1333         if (vol->UNCip == NULL)
1334                 vol->UNCip = &vol->UNC[2];
1335
1336         return 0;
1337 }
1338
1339 static struct cifsSesInfo *
1340 cifs_find_tcp_session(struct in_addr *target_ip_addr,
1341                       struct in6_addr *target_ip6_addr,
1342                       char *userName, struct TCP_Server_Info **psrvTcp)
1343 {
1344         struct list_head *tmp;
1345         struct cifsSesInfo *ses;
1346
1347         *psrvTcp = NULL;
1348
1349         read_lock(&GlobalSMBSeslock);
1350         list_for_each(tmp, &GlobalSMBSessionList) {
1351                 ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
1352                 if (!ses->server)
1353                         continue;
1354
1355                 if (target_ip_addr &&
1356                     ses->server->addr.sockAddr.sin_addr.s_addr != target_ip_addr->s_addr)
1357                                 continue;
1358                 else if (target_ip6_addr &&
1359                          memcmp(&ses->server->addr.sockAddr6.sin6_addr,
1360                                 target_ip6_addr, sizeof(*target_ip6_addr)))
1361                                 continue;
1362                 /* BB lock server and tcp session; increment use count here?? */
1363
1364                 /* found a match on the TCP session */
1365                 *psrvTcp = ses->server;
1366
1367                 /* BB check if reconnection needed */
1368                 if (strncmp(ses->userName, userName, MAX_USERNAME_SIZE) == 0) {
1369                         read_unlock(&GlobalSMBSeslock);
1370                         /* Found exact match on both TCP and
1371                            SMB sessions */
1372                         return ses;
1373                 }
1374                 /* else tcp and smb sessions need reconnection */
1375         }
1376         read_unlock(&GlobalSMBSeslock);
1377
1378         return NULL;
1379 }
1380
1381 static struct cifsTconInfo *
1382 find_unc(__be32 new_target_ip_addr, char *uncName, char *userName)
1383 {
1384         struct list_head *tmp;
1385         struct cifsTconInfo *tcon;
1386         __be32 old_ip;
1387
1388         read_lock(&GlobalSMBSeslock);
1389
1390         list_for_each(tmp, &GlobalTreeConnectionList) {
1391                 cFYI(1, ("Next tcon"));
1392                 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
1393                 if (!tcon->ses || !tcon->ses->server)
1394                         continue;
1395
1396                 old_ip = tcon->ses->server->addr.sockAddr.sin_addr.s_addr;
1397                 cFYI(1, ("old ip addr: %x == new ip %x ?",
1398                         old_ip, new_target_ip_addr));
1399
1400                 if (old_ip != new_target_ip_addr)
1401                         continue;
1402
1403                 /* BB lock tcon, server, tcp session and increment use count? */
1404                 /* found a match on the TCP session */
1405                 /* BB check if reconnection needed */
1406                 cFYI(1, ("IP match, old UNC: %s new: %s",
1407                         tcon->treeName, uncName));
1408
1409                 if (strncmp(tcon->treeName, uncName, MAX_TREE_SIZE))
1410                         continue;
1411
1412                 cFYI(1, ("and old usr: %s new: %s",
1413                         tcon->treeName, uncName));
1414
1415                 if (strncmp(tcon->ses->userName, userName, MAX_USERNAME_SIZE))
1416                         continue;
1417
1418                 /* matched smb session (user name) */
1419                 read_unlock(&GlobalSMBSeslock);
1420                 return tcon;
1421         }
1422
1423         read_unlock(&GlobalSMBSeslock);
1424         return NULL;
1425 }
1426
1427 int
1428 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1429              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1430              struct dfs_info3_param **preferrals, int remap)
1431 {
1432         char *temp_unc;
1433         int rc = 0;
1434
1435         *pnum_referrals = 0;
1436         *preferrals = NULL;
1437
1438         if (pSesInfo->ipc_tid == 0) {
1439                 temp_unc = kmalloc(2 /* for slashes */ +
1440                         strnlen(pSesInfo->serverName,
1441                                 SERVER_NAME_LEN_WITH_NULL * 2)
1442                                  + 1 + 4 /* slash IPC$ */  + 2,
1443                                 GFP_KERNEL);
1444                 if (temp_unc == NULL)
1445                         return -ENOMEM;
1446                 temp_unc[0] = '\\';
1447                 temp_unc[1] = '\\';
1448                 strcpy(temp_unc + 2, pSesInfo->serverName);
1449                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1450                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1451                 cFYI(1,
1452                      ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1453                 kfree(temp_unc);
1454         }
1455         if (rc == 0)
1456                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1457                                      pnum_referrals, nls_codepage, remap);
1458         /* BB map targetUNCs to dfs_info3 structures, here or
1459                 in CIFSGetDFSRefer BB */
1460
1461         return rc;
1462 }
1463
1464 /* See RFC1001 section 14 on representation of Netbios names */
1465 static void rfc1002mangle(char *target, char *source, unsigned int length)
1466 {
1467         unsigned int i, j;
1468
1469         for (i = 0, j = 0; i < (length); i++) {
1470                 /* mask a nibble at a time and encode */
1471                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1472                 target[j+1] = 'A' + (0x0F & source[i]);
1473                 j += 2;
1474         }
1475
1476 }
1477
1478
1479 static int
1480 ipv4_connect(struct sockaddr_in *psin_server, struct socket **csocket,
1481              char *netbios_name, char *target_name)
1482 {
1483         int rc = 0;
1484         int connected = 0;
1485         __be16 orig_port = 0;
1486
1487         if (*csocket == NULL) {
1488                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1489                                       IPPROTO_TCP, csocket);
1490                 if (rc < 0) {
1491                         cERROR(1, ("Error %d creating socket", rc));
1492                         *csocket = NULL;
1493                         return rc;
1494                 } else {
1495                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1496                         cFYI(1, ("Socket created"));
1497                         (*csocket)->sk->sk_allocation = GFP_NOFS;
1498                 }
1499         }
1500
1501         psin_server->sin_family = AF_INET;
1502         if (psin_server->sin_port) { /* user overrode default port */
1503                 rc = (*csocket)->ops->connect(*csocket,
1504                                 (struct sockaddr *) psin_server,
1505                                 sizeof(struct sockaddr_in), 0);
1506                 if (rc >= 0)
1507                         connected = 1;
1508         }
1509
1510         if (!connected) {
1511                 /* save original port so we can retry user specified port
1512                         later if fall back ports fail this time  */
1513                 orig_port = psin_server->sin_port;
1514
1515                 /* do not retry on the same port we just failed on */
1516                 if (psin_server->sin_port != htons(CIFS_PORT)) {
1517                         psin_server->sin_port = htons(CIFS_PORT);
1518
1519                         rc = (*csocket)->ops->connect(*csocket,
1520                                         (struct sockaddr *) psin_server,
1521                                         sizeof(struct sockaddr_in), 0);
1522                         if (rc >= 0)
1523                                 connected = 1;
1524                 }
1525         }
1526         if (!connected) {
1527                 psin_server->sin_port = htons(RFC1001_PORT);
1528                 rc = (*csocket)->ops->connect(*csocket, (struct sockaddr *)
1529                                               psin_server,
1530                                               sizeof(struct sockaddr_in), 0);
1531                 if (rc >= 0)
1532                         connected = 1;
1533         }
1534
1535         /* give up here - unless we want to retry on different
1536                 protocol families some day */
1537         if (!connected) {
1538                 if (orig_port)
1539                         psin_server->sin_port = orig_port;
1540                 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1541                 sock_release(*csocket);
1542                 *csocket = NULL;
1543                 return rc;
1544         }
1545         /* Eventually check for other socket options to change from
1546                 the default. sock_setsockopt not used because it expects
1547                 user space buffer */
1548          cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1549                  (*csocket)->sk->sk_sndbuf,
1550                  (*csocket)->sk->sk_rcvbuf, (*csocket)->sk->sk_rcvtimeo));
1551         (*csocket)->sk->sk_rcvtimeo = 7 * HZ;
1552         /* make the bufsizes depend on wsize/rsize and max requests */
1553         if ((*csocket)->sk->sk_sndbuf < (200 * 1024))
1554                 (*csocket)->sk->sk_sndbuf = 200 * 1024;
1555         if ((*csocket)->sk->sk_rcvbuf < (140 * 1024))
1556                 (*csocket)->sk->sk_rcvbuf = 140 * 1024;
1557
1558         /* send RFC1001 sessinit */
1559         if (psin_server->sin_port == htons(RFC1001_PORT)) {
1560                 /* some servers require RFC1001 sessinit before sending
1561                 negprot - BB check reconnection in case where second
1562                 sessinit is sent but no second negprot */
1563                 struct rfc1002_session_packet *ses_init_buf;
1564                 struct smb_hdr *smb_buf;
1565                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1566                                        GFP_KERNEL);
1567                 if (ses_init_buf) {
1568                         ses_init_buf->trailer.session_req.called_len = 32;
1569                         if (target_name && (target_name[0] != 0)) {
1570                                 rfc1002mangle(ses_init_buf->trailer.session_req.called_name,
1571                                         target_name, 16);
1572                         } else {
1573                                 rfc1002mangle(ses_init_buf->trailer.session_req.called_name,
1574                                         DEFAULT_CIFS_CALLED_NAME, 16);
1575                         }
1576
1577                         ses_init_buf->trailer.session_req.calling_len = 32;
1578                         /* calling name ends in null (byte 16) from old smb
1579                         convention. */
1580                         if (netbios_name && (netbios_name[0] != 0)) {
1581                                 rfc1002mangle(ses_init_buf->trailer.session_req.calling_name,
1582                                         netbios_name, 16);
1583                         } else {
1584                                 rfc1002mangle(ses_init_buf->trailer.session_req.calling_name,
1585                                         "LINUX_CIFS_CLNT", 16);
1586                         }
1587                         ses_init_buf->trailer.session_req.scope1 = 0;
1588                         ses_init_buf->trailer.session_req.scope2 = 0;
1589                         smb_buf = (struct smb_hdr *)ses_init_buf;
1590                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1591                         smb_buf->smb_buf_length = 0x81000044;
1592                         rc = smb_send(*csocket, smb_buf, 0x44,
1593                                 (struct sockaddr *)psin_server);
1594                         kfree(ses_init_buf);
1595                         msleep(1); /* RFC1001 layer in at least one server
1596                                       requires very short break before negprot
1597                                       presumably because not expecting negprot
1598                                       to follow so fast.  This is a simple
1599                                       solution that works without
1600                                       complicating the code and causes no
1601                                       significant slowing down on mount
1602                                       for everyone else */
1603                 }
1604                 /* else the negprot may still work without this
1605                 even though malloc failed */
1606
1607         }
1608
1609         return rc;
1610 }
1611
1612 static int
1613 ipv6_connect(struct sockaddr_in6 *psin_server, struct socket **csocket)
1614 {
1615         int rc = 0;
1616         int connected = 0;
1617         __be16 orig_port = 0;
1618
1619         if (*csocket == NULL) {
1620                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1621                                       IPPROTO_TCP, csocket);
1622                 if (rc < 0) {
1623                         cERROR(1, ("Error %d creating ipv6 socket", rc));
1624                         *csocket = NULL;
1625                         return rc;
1626                 } else {
1627                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1628                          cFYI(1, ("ipv6 Socket created"));
1629                         (*csocket)->sk->sk_allocation = GFP_NOFS;
1630                 }
1631         }
1632
1633         psin_server->sin6_family = AF_INET6;
1634
1635         if (psin_server->sin6_port) { /* user overrode default port */
1636                 rc = (*csocket)->ops->connect(*csocket,
1637                                 (struct sockaddr *) psin_server,
1638                                 sizeof(struct sockaddr_in6), 0);
1639                 if (rc >= 0)
1640                         connected = 1;
1641         }
1642
1643         if (!connected) {
1644                 /* save original port so we can retry user specified port
1645                         later if fall back ports fail this time  */
1646
1647                 orig_port = psin_server->sin6_port;
1648                 /* do not retry on the same port we just failed on */
1649                 if (psin_server->sin6_port != htons(CIFS_PORT)) {
1650                         psin_server->sin6_port = htons(CIFS_PORT);
1651
1652                         rc = (*csocket)->ops->connect(*csocket,
1653                                         (struct sockaddr *) psin_server,
1654                                         sizeof(struct sockaddr_in6), 0);
1655                         if (rc >= 0)
1656                                 connected = 1;
1657                 }
1658         }
1659         if (!connected) {
1660                 psin_server->sin6_port = htons(RFC1001_PORT);
1661                 rc = (*csocket)->ops->connect(*csocket, (struct sockaddr *)
1662                                  psin_server, sizeof(struct sockaddr_in6), 0);
1663                 if (rc >= 0)
1664                         connected = 1;
1665         }
1666
1667         /* give up here - unless we want to retry on different
1668                 protocol families some day */
1669         if (!connected) {
1670                 if (orig_port)
1671                         psin_server->sin6_port = orig_port;
1672                 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1673                 sock_release(*csocket);
1674                 *csocket = NULL;
1675                 return rc;
1676         }
1677         /* Eventually check for other socket options to change from
1678                 the default. sock_setsockopt not used because it expects
1679                 user space buffer */
1680         (*csocket)->sk->sk_rcvtimeo = 7 * HZ;
1681
1682         return rc;
1683 }
1684
1685 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1686                           struct super_block *sb, struct smb_vol *vol_info)
1687 {
1688         /* if we are reconnecting then should we check to see if
1689          * any requested capabilities changed locally e.g. via
1690          * remount but we can not do much about it here
1691          * if they have (even if we could detect it by the following)
1692          * Perhaps we could add a backpointer to array of sb from tcon
1693          * or if we change to make all sb to same share the same
1694          * sb as NFS - then we only have one backpointer to sb.
1695          * What if we wanted to mount the server share twice once with
1696          * and once without posixacls or posix paths? */
1697         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1698
1699         if (vol_info && vol_info->no_linux_ext) {
1700                 tcon->fsUnixInfo.Capability = 0;
1701                 tcon->unix_ext = 0; /* Unix Extensions disabled */
1702                 cFYI(1, ("Linux protocol extensions disabled"));
1703                 return;
1704         } else if (vol_info)
1705                 tcon->unix_ext = 1; /* Unix Extensions supported */
1706
1707         if (tcon->unix_ext == 0) {
1708                 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1709                 return;
1710         }
1711
1712         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1713                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1714
1715                 /* check for reconnect case in which we do not
1716                    want to change the mount behavior if we can avoid it */
1717                 if (vol_info == NULL) {
1718                         /* turn off POSIX ACL and PATHNAMES if not set
1719                            originally at mount time */
1720                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1721                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1722                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1723                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1724                                         cERROR(1, ("POSIXPATH support change"));
1725                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1726                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1727                                 cERROR(1, ("possible reconnect error"));
1728                                 cERROR(1,
1729                                         ("server disabled POSIX path support"));
1730                         }
1731                 }
1732
1733                 cap &= CIFS_UNIX_CAP_MASK;
1734                 if (vol_info && vol_info->no_psx_acl)
1735                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1736                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
1737                         cFYI(1, ("negotiated posix acl support"));
1738                         if (sb)
1739                                 sb->s_flags |= MS_POSIXACL;
1740                 }
1741
1742                 if (vol_info && vol_info->posix_paths == 0)
1743                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1744                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
1745                         cFYI(1, ("negotiate posix pathnames"));
1746                         if (sb)
1747                                 CIFS_SB(sb)->mnt_cifs_flags |=
1748                                         CIFS_MOUNT_POSIX_PATHS;
1749                 }
1750
1751                 /* We might be setting the path sep back to a different
1752                 form if we are reconnecting and the server switched its
1753                 posix path capability for this share */
1754                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
1755                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
1756
1757                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
1758                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
1759                                 CIFS_SB(sb)->rsize = 127 * 1024;
1760                                 cFYI(DBG2,
1761                                         ("larger reads not supported by srv"));
1762                         }
1763                 }
1764
1765
1766                 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
1767 #ifdef CONFIG_CIFS_DEBUG2
1768                 if (cap & CIFS_UNIX_FCNTL_CAP)
1769                         cFYI(1, ("FCNTL cap"));
1770                 if (cap & CIFS_UNIX_EXTATTR_CAP)
1771                         cFYI(1, ("EXTATTR cap"));
1772                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1773                         cFYI(1, ("POSIX path cap"));
1774                 if (cap & CIFS_UNIX_XATTR_CAP)
1775                         cFYI(1, ("XATTR cap"));
1776                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
1777                         cFYI(1, ("POSIX ACL cap"));
1778                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
1779                         cFYI(1, ("very large read cap"));
1780                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
1781                         cFYI(1, ("very large write cap"));
1782 #endif /* CIFS_DEBUG2 */
1783                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
1784                         if (vol_info == NULL) {
1785                                 cFYI(1, ("resetting capabilities failed"));
1786                         } else
1787                                 cERROR(1, ("Negotiating Unix capabilities "
1788                                            "with the server failed.  Consider "
1789                                            "mounting with the Unix Extensions\n"
1790                                            "disabled, if problems are found, "
1791                                            "by specifying the nounix mount "
1792                                            "option."));
1793
1794                 }
1795         }
1796 }
1797
1798 static void
1799 convert_delimiter(char *path, char delim)
1800 {
1801         int i;
1802         char old_delim;
1803
1804         if (path == NULL)
1805                 return;
1806
1807         if (delim == '/')
1808                 old_delim = '\\';
1809         else
1810                 old_delim = '/';
1811
1812         for (i = 0; path[i] != '\0'; i++) {
1813                 if (path[i] == old_delim)
1814                         path[i] = delim;
1815         }
1816 }
1817
1818 int
1819 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
1820            char *mount_data, const char *devname)
1821 {
1822         int rc = 0;
1823         int xid;
1824         int address_type = AF_INET;
1825         struct socket *csocket = NULL;
1826         struct sockaddr_in sin_server;
1827         struct sockaddr_in6 sin_server6;
1828         struct smb_vol volume_info;
1829         struct cifsSesInfo *pSesInfo = NULL;
1830         struct cifsSesInfo *existingCifsSes = NULL;
1831         struct cifsTconInfo *tcon = NULL;
1832         struct TCP_Server_Info *srvTcp = NULL;
1833
1834         xid = GetXid();
1835
1836 /* cFYI(1, ("Entering cifs_mount. Xid: %d with: %s", xid, mount_data)); */
1837
1838         memset(&volume_info, 0, sizeof(struct smb_vol));
1839         if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
1840                 rc = -EINVAL;
1841                 goto out;
1842         }
1843
1844         if (volume_info.nullauth) {
1845                 cFYI(1, ("null user"));
1846                 volume_info.username = "";
1847         } else if (volume_info.username) {
1848                 /* BB fixme parse for domain name here */
1849                 cFYI(1, ("Username: %s", volume_info.username));
1850         } else {
1851                 cifserror("No username specified");
1852         /* In userspace mount helper we can get user name from alternate
1853            locations such as env variables and files on disk */
1854                 rc = -EINVAL;
1855                 goto out;
1856         }
1857
1858         if (volume_info.UNCip && volume_info.UNC) {
1859                 rc = cifs_inet_pton(AF_INET, volume_info.UNCip,
1860                                     &sin_server.sin_addr.s_addr);
1861
1862                 if (rc <= 0) {
1863                         /* not ipv4 address, try ipv6 */
1864                         rc = cifs_inet_pton(AF_INET6, volume_info.UNCip,
1865                                             &sin_server6.sin6_addr.in6_u);
1866                         if (rc > 0)
1867                                 address_type = AF_INET6;
1868                 } else {
1869                         address_type = AF_INET;
1870                 }
1871
1872                 if (rc <= 0) {
1873                         /* we failed translating address */
1874                         rc = -EINVAL;
1875                         goto out;
1876                 }
1877
1878                 cFYI(1, ("UNC: %s ip: %s", volume_info.UNC, volume_info.UNCip));
1879                 /* success */
1880                 rc = 0;
1881         } else if (volume_info.UNCip) {
1882                 /* BB using ip addr as server name to connect to the
1883                    DFS root below */
1884                 cERROR(1, ("Connecting to DFS root not implemented yet"));
1885                 rc = -EINVAL;
1886                 goto out;
1887         } else /* which servers DFS root would we conect to */ {
1888                 cERROR(1,
1889                        ("CIFS mount error: No UNC path (e.g. -o "
1890                         "unc=//192.168.1.100/public) specified"));
1891                 rc = -EINVAL;
1892                 goto out;
1893         }
1894
1895         /* this is needed for ASCII cp to Unicode converts */
1896         if (volume_info.iocharset == NULL) {
1897                 cifs_sb->local_nls = load_nls_default();
1898         /* load_nls_default can not return null */
1899         } else {
1900                 cifs_sb->local_nls = load_nls(volume_info.iocharset);
1901                 if (cifs_sb->local_nls == NULL) {
1902                         cERROR(1, ("CIFS mount error: iocharset %s not found",
1903                                  volume_info.iocharset));
1904                         rc = -ELIBACC;
1905                         goto out;
1906                 }
1907         }
1908
1909         if (address_type == AF_INET)
1910                 existingCifsSes = cifs_find_tcp_session(&sin_server.sin_addr,
1911                         NULL /* no ipv6 addr */,
1912                         volume_info.username, &srvTcp);
1913         else if (address_type == AF_INET6) {
1914                 cFYI(1, ("looking for ipv6 address"));
1915                 existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
1916                         &sin_server6.sin6_addr,
1917                         volume_info.username, &srvTcp);
1918         } else {
1919                 rc = -EINVAL;
1920                 goto out;
1921         }
1922
1923         if (srvTcp) {
1924                 cFYI(1, ("Existing tcp session with server found"));
1925         } else {        /* create socket */
1926                 if (volume_info.port)
1927                         sin_server.sin_port = htons(volume_info.port);
1928                 else
1929                         sin_server.sin_port = 0;
1930                 if (address_type == AF_INET6) {
1931                         cFYI(1, ("attempting ipv6 connect"));
1932                         /* BB should we allow ipv6 on port 139? */
1933                         /* other OS never observed in Wild doing 139 with v6 */
1934                         rc = ipv6_connect(&sin_server6, &csocket);
1935                 } else
1936                         rc = ipv4_connect(&sin_server, &csocket,
1937                                   volume_info.source_rfc1001_name,
1938                                   volume_info.target_rfc1001_name);
1939                 if (rc < 0) {
1940                         cERROR(1, ("Error connecting to IPv4 socket. "
1941                                    "Aborting operation"));
1942                         if (csocket != NULL)
1943                                 sock_release(csocket);
1944                         goto out;
1945                 }
1946
1947                 srvTcp = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1948                 if (!srvTcp) {
1949                         rc = -ENOMEM;
1950                         sock_release(csocket);
1951                         goto out;
1952                 } else {
1953                         memcpy(&srvTcp->addr.sockAddr, &sin_server,
1954                                 sizeof(struct sockaddr_in));
1955                         atomic_set(&srvTcp->inFlight, 0);
1956                         /* BB Add code for ipv6 case too */
1957                         srvTcp->ssocket = csocket;
1958                         srvTcp->protocolType = IPV4;
1959                         srvTcp->hostname = extract_hostname(volume_info.UNC);
1960                         if (IS_ERR(srvTcp->hostname)) {
1961                                 rc = PTR_ERR(srvTcp->hostname);
1962                                 sock_release(csocket);
1963                                 goto out;
1964                         }
1965                         init_waitqueue_head(&srvTcp->response_q);
1966                         init_waitqueue_head(&srvTcp->request_q);
1967                         INIT_LIST_HEAD(&srvTcp->pending_mid_q);
1968                         /* at this point we are the only ones with the pointer
1969                         to the struct since the kernel thread not created yet
1970                         so no need to spinlock this init of tcpStatus */
1971                         srvTcp->tcpStatus = CifsNew;
1972                         init_MUTEX(&srvTcp->tcpSem);
1973                         srvTcp->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread, srvTcp, "cifsd");
1974                         if (IS_ERR(srvTcp->tsk)) {
1975                                 rc = PTR_ERR(srvTcp->tsk);
1976                                 cERROR(1, ("error %d create cifsd thread", rc));
1977                                 srvTcp->tsk = NULL;
1978                                 sock_release(csocket);
1979                                 kfree(srvTcp->hostname);
1980                                 goto out;
1981                         }
1982                         rc = 0;
1983                         memcpy(srvTcp->workstation_RFC1001_name,
1984                                 volume_info.source_rfc1001_name, 16);
1985                         memcpy(srvTcp->server_RFC1001_name,
1986                                 volume_info.target_rfc1001_name, 16);
1987                         srvTcp->sequence_number = 0;
1988                 }
1989         }
1990
1991         if (existingCifsSes) {
1992                 pSesInfo = existingCifsSes;
1993                 cFYI(1, ("Existing smb sess found (status=%d)",
1994                         pSesInfo->status));
1995                 down(&pSesInfo->sesSem);
1996                 if (pSesInfo->status == CifsNeedReconnect) {
1997                         cFYI(1, ("Session needs reconnect"));
1998                         rc = cifs_setup_session(xid, pSesInfo,
1999                                                 cifs_sb->local_nls);
2000                 }
2001                 up(&pSesInfo->sesSem);
2002         } else if (!rc) {
2003                 cFYI(1, ("Existing smb sess not found"));
2004                 pSesInfo = sesInfoAlloc();
2005                 if (pSesInfo == NULL)
2006                         rc = -ENOMEM;
2007                 else {
2008                         pSesInfo->server = srvTcp;
2009                         sprintf(pSesInfo->serverName, "%u.%u.%u.%u",
2010                                 NIPQUAD(sin_server.sin_addr.s_addr));
2011                 }
2012
2013                 if (!rc) {
2014                         /* volume_info.password freed at unmount */
2015                         if (volume_info.password) {
2016                                 pSesInfo->password = volume_info.password;
2017                                 /* set to NULL to prevent freeing on exit */
2018                                 volume_info.password = NULL;
2019                         }
2020                         if (volume_info.username)
2021                                 strncpy(pSesInfo->userName,
2022                                         volume_info.username,
2023                                         MAX_USERNAME_SIZE);
2024                         if (volume_info.domainname) {
2025                                 int len = strlen(volume_info.domainname);
2026                                 pSesInfo->domainName =
2027                                         kmalloc(len + 1, GFP_KERNEL);
2028                                 if (pSesInfo->domainName)
2029                                         strcpy(pSesInfo->domainName,
2030                                                 volume_info.domainname);
2031                         }
2032                         pSesInfo->linux_uid = volume_info.linux_uid;
2033                         pSesInfo->overrideSecFlg = volume_info.secFlg;
2034                         down(&pSesInfo->sesSem);
2035                         /* BB FIXME need to pass vol->secFlgs BB */
2036                         rc = cifs_setup_session(xid, pSesInfo,
2037                                                 cifs_sb->local_nls);
2038                         up(&pSesInfo->sesSem);
2039                         if (!rc)
2040                                 atomic_inc(&srvTcp->socketUseCount);
2041                 }
2042         }
2043
2044         /* search for existing tcon to this server share */
2045         if (!rc) {
2046                 if (volume_info.rsize > CIFSMaxBufSize) {
2047                         cERROR(1, ("rsize %d too large, using MaxBufSize",
2048                                 volume_info.rsize));
2049                         cifs_sb->rsize = CIFSMaxBufSize;
2050                 } else if ((volume_info.rsize) &&
2051                                 (volume_info.rsize <= CIFSMaxBufSize))
2052                         cifs_sb->rsize = volume_info.rsize;
2053                 else /* default */
2054                         cifs_sb->rsize = CIFSMaxBufSize;
2055
2056                 if (volume_info.wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2057                         cERROR(1, ("wsize %d too large, using 4096 instead",
2058                                   volume_info.wsize));
2059                         cifs_sb->wsize = 4096;
2060                 } else if (volume_info.wsize)
2061                         cifs_sb->wsize = volume_info.wsize;
2062                 else
2063                         cifs_sb->wsize =
2064                                 min_t(const int, PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2065                                         127*1024);
2066                         /* old default of CIFSMaxBufSize was too small now
2067                            that SMB Write2 can send multiple pages in kvec.
2068                            RFC1001 does not describe what happens when frame
2069                            bigger than 128K is sent so use that as max in
2070                            conjunction with 52K kvec constraint on arch with 4K
2071                            page size  */
2072
2073                 if (cifs_sb->rsize < 2048) {
2074                         cifs_sb->rsize = 2048;
2075                         /* Windows ME may prefer this */
2076                         cFYI(1, ("readsize set to minimum: 2048"));
2077                 }
2078                 /* calculate prepath */
2079                 cifs_sb->prepath = volume_info.prepath;
2080                 if (cifs_sb->prepath) {
2081                         cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2082                         /* we can not convert the / to \ in the path
2083                         separators in the prefixpath yet because we do not
2084                         know (until reset_cifs_unix_caps is called later)
2085                         whether POSIX PATH CAP is available. We normalize
2086                         the / to \ after reset_cifs_unix_caps is called */
2087                         volume_info.prepath = NULL;
2088                 } else
2089                         cifs_sb->prepathlen = 0;
2090                 cifs_sb->mnt_uid = volume_info.linux_uid;
2091                 cifs_sb->mnt_gid = volume_info.linux_gid;
2092                 cifs_sb->mnt_file_mode = volume_info.file_mode;
2093                 cifs_sb->mnt_dir_mode = volume_info.dir_mode;
2094                 cFYI(1, ("file mode: 0x%x  dir mode: 0x%x",
2095                         cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2096
2097                 if (volume_info.noperm)
2098                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2099                 if (volume_info.setuids)
2100                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2101                 if (volume_info.server_ino)
2102                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2103                 if (volume_info.remap)
2104                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2105                 if (volume_info.no_xattr)
2106                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2107                 if (volume_info.sfu_emul)
2108                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2109                 if (volume_info.nobrl)
2110                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2111                 if (volume_info.cifs_acl)
2112                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2113                 if (volume_info.override_uid)
2114                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2115                 if (volume_info.override_gid)
2116                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2117                 if (volume_info.dynperm)
2118                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2119                 if (volume_info.direct_io) {
2120                         cFYI(1, ("mounting share using direct i/o"));
2121                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2122                 }
2123
2124                 if ((volume_info.cifs_acl) && (volume_info.dynperm))
2125                         cERROR(1, ("mount option dynperm ignored if cifsacl "
2126                                    "mount option supported"));
2127
2128                 tcon =
2129                     find_unc(sin_server.sin_addr.s_addr, volume_info.UNC,
2130                              volume_info.username);
2131                 if (tcon) {
2132                         cFYI(1, ("Found match on UNC path"));
2133                         /* we can have only one retry value for a connection
2134                            to a share so for resources mounted more than once
2135                            to the same server share the last value passed in
2136                            for the retry flag is used */
2137                         tcon->retry = volume_info.retry;
2138                         tcon->nocase = volume_info.nocase;
2139                         if (tcon->seal != volume_info.seal)
2140                                 cERROR(1, ("transport encryption setting "
2141                                            "conflicts with existing tid"));
2142                 } else {
2143                         tcon = tconInfoAlloc();
2144                         if (tcon == NULL)
2145                                 rc = -ENOMEM;
2146                         else {
2147                                 /* check for null share name ie connecting to
2148                                  * dfs root */
2149
2150                                 /* BB check if this works for exactly length
2151                                  * three strings */
2152                                 if ((strchr(volume_info.UNC + 3, '\\') == NULL)
2153                                     && (strchr(volume_info.UNC + 3, '/') ==
2154                                         NULL)) {
2155 /*                                      rc = connect_to_dfs_path(xid, pSesInfo,
2156                                                 "", cifs_sb->local_nls,
2157                                                 cifs_sb->mnt_cifs_flags &
2158                                                   CIFS_MOUNT_MAP_SPECIAL_CHR);*/
2159                                         cFYI(1, ("DFS root not supported"));
2160                                         rc = -ENODEV;
2161                                         goto out;
2162                                 } else {
2163                                         /* BB Do we need to wrap sesSem around
2164                                          * this TCon call and Unix SetFS as
2165                                          * we do on SessSetup and reconnect? */
2166                                         rc = CIFSTCon(xid, pSesInfo,
2167                                                 volume_info.UNC,
2168                                                 tcon, cifs_sb->local_nls);
2169                                         cFYI(1, ("CIFS Tcon rc = %d", rc));
2170                                 }
2171                                 if (!rc) {
2172                                         atomic_inc(&pSesInfo->inUse);
2173                                         tcon->retry = volume_info.retry;
2174                                         tcon->nocase = volume_info.nocase;
2175                                         tcon->seal = volume_info.seal;
2176                                 }
2177                         }
2178                 }
2179         }
2180         if (pSesInfo) {
2181                 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2182                         sb->s_maxbytes = (u64) 1 << 63;
2183                 } else
2184                         sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2185         }
2186
2187         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2188         sb->s_time_gran = 100;
2189
2190 /* on error free sesinfo and tcon struct if needed */
2191         if (rc) {
2192                 /* if session setup failed, use count is zero but
2193                 we still need to free cifsd thread */
2194                 if (atomic_read(&srvTcp->socketUseCount) == 0) {
2195                         spin_lock(&GlobalMid_Lock);
2196                         srvTcp->tcpStatus = CifsExiting;
2197                         spin_unlock(&GlobalMid_Lock);
2198                         if (srvTcp->tsk) {
2199                                 /* If we could verify that kthread_stop would
2200                                    always wake up processes blocked in
2201                                    tcp in recv_mesg then we could remove the
2202                                    send_sig call */
2203                                 force_sig(SIGKILL, srvTcp->tsk);
2204                                 kthread_stop(srvTcp->tsk);
2205                         }
2206                 }
2207                  /* If find_unc succeeded then rc == 0 so we can not end */
2208                 if (tcon)  /* up accidently freeing someone elses tcon struct */
2209                         tconInfoFree(tcon);
2210                 if (existingCifsSes == NULL) {
2211                         if (pSesInfo) {
2212                                 if ((pSesInfo->server) &&
2213                                     (pSesInfo->status == CifsGood)) {
2214                                         int temp_rc;
2215                                         temp_rc = CIFSSMBLogoff(xid, pSesInfo);
2216                                         /* if the socketUseCount is now zero */
2217                                         if ((temp_rc == -ESHUTDOWN) &&
2218                                             (pSesInfo->server) &&
2219                                             (pSesInfo->server->tsk)) {
2220                                                 force_sig(SIGKILL,
2221                                                         pSesInfo->server->tsk);
2222                                                 kthread_stop(pSesInfo->server->tsk);
2223                                         }
2224                                 } else {
2225                                         cFYI(1, ("No session or bad tcon"));
2226                                         if ((pSesInfo->server) &&
2227                                             (pSesInfo->server->tsk)) {
2228                                                 force_sig(SIGKILL,
2229                                                         pSesInfo->server->tsk);
2230                                                 kthread_stop(pSesInfo->server->tsk);
2231                                         }
2232                                 }
2233                                 sesInfoFree(pSesInfo);
2234                                 /* pSesInfo = NULL; */
2235                         }
2236                 }
2237         } else {
2238                 atomic_inc(&tcon->useCount);
2239                 cifs_sb->tcon = tcon;
2240                 tcon->ses = pSesInfo;
2241
2242                 /* do not care if following two calls succeed - informational */
2243                 if (!tcon->ipc) {
2244                         CIFSSMBQFSDeviceInfo(xid, tcon);
2245                         CIFSSMBQFSAttributeInfo(xid, tcon);
2246                 }
2247
2248                 /* tell server which Unix caps we support */
2249                 if (tcon->ses->capabilities & CAP_UNIX)
2250                         /* reset of caps checks mount to see if unix extensions
2251                            disabled for just this mount */
2252                         reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
2253                 else
2254                         tcon->unix_ext = 0; /* server does not support them */
2255
2256                 /* convert forward to back slashes in prepath here if needed */
2257                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2258                         convert_delimiter(cifs_sb->prepath,
2259                                           CIFS_DIR_SEP(cifs_sb));
2260
2261                 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2262                         cifs_sb->rsize = 1024 * 127;
2263                         cFYI(DBG2,
2264                                 ("no very large read support, rsize now 127K"));
2265                 }
2266                 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2267                         cifs_sb->wsize = min(cifs_sb->wsize,
2268                                              (tcon->ses->server->maxBuf -
2269                                               MAX_CIFS_HDR_SIZE));
2270                 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2271                         cifs_sb->rsize = min(cifs_sb->rsize,
2272                                              (tcon->ses->server->maxBuf -
2273                                               MAX_CIFS_HDR_SIZE));
2274         }
2275
2276         /* volume_info.password is freed above when existing session found
2277         (in which case it is not needed anymore) but when new sesion is created
2278         the password ptr is put in the new session structure (in which case the
2279         password will be freed at unmount time) */
2280 out:
2281         /* zero out password before freeing */
2282         if (volume_info.password != NULL) {
2283                 memset(volume_info.password, 0, strlen(volume_info.password));
2284                 kfree(volume_info.password);
2285         }
2286         kfree(volume_info.UNC);
2287         kfree(volume_info.prepath);
2288         FreeXid(xid);
2289         return rc;
2290 }
2291
2292 static int
2293 CIFSSessSetup(unsigned int xid, struct cifsSesInfo *ses,
2294               char session_key[CIFS_SESS_KEY_SIZE],
2295               const struct nls_table *nls_codepage)
2296 {
2297         struct smb_hdr *smb_buffer;
2298         struct smb_hdr *smb_buffer_response;
2299         SESSION_SETUP_ANDX *pSMB;
2300         SESSION_SETUP_ANDX *pSMBr;
2301         char *bcc_ptr;
2302         char *user;
2303         char *domain;
2304         int rc = 0;
2305         int remaining_words = 0;
2306         int bytes_returned = 0;
2307         int len;
2308         __u32 capabilities;
2309         __u16 count;
2310
2311         cFYI(1, ("In sesssetup"));
2312         if (ses == NULL)
2313                 return -EINVAL;
2314         user = ses->userName;
2315         domain = ses->domainName;
2316         smb_buffer = cifs_buf_get();
2317
2318         if (smb_buffer == NULL)
2319                 return -ENOMEM;
2320
2321         smb_buffer_response = smb_buffer;
2322         pSMBr = pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2323
2324         /* send SMBsessionSetup here */
2325         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2326                         NULL /* no tCon exists yet */ , 13 /* wct */ );
2327
2328         smb_buffer->Mid = GetNextMid(ses->server);
2329         pSMB->req_no_secext.AndXCommand = 0xFF;
2330         pSMB->req_no_secext.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2331         pSMB->req_no_secext.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2332
2333         if (ses->server->secMode &
2334                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2335                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2336
2337         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2338                 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
2339         if (ses->capabilities & CAP_UNICODE) {
2340                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2341                 capabilities |= CAP_UNICODE;
2342         }
2343         if (ses->capabilities & CAP_STATUS32) {
2344                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2345                 capabilities |= CAP_STATUS32;
2346         }
2347         if (ses->capabilities & CAP_DFS) {
2348                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2349                 capabilities |= CAP_DFS;
2350         }
2351         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
2352
2353         pSMB->req_no_secext.CaseInsensitivePasswordLength =
2354                 cpu_to_le16(CIFS_SESS_KEY_SIZE);
2355
2356         pSMB->req_no_secext.CaseSensitivePasswordLength =
2357             cpu_to_le16(CIFS_SESS_KEY_SIZE);
2358         bcc_ptr = pByteArea(smb_buffer);
2359         memcpy(bcc_ptr, (char *) session_key, CIFS_SESS_KEY_SIZE);
2360         bcc_ptr += CIFS_SESS_KEY_SIZE;
2361         memcpy(bcc_ptr, (char *) session_key, CIFS_SESS_KEY_SIZE);
2362         bcc_ptr += CIFS_SESS_KEY_SIZE;
2363
2364         if (ses->capabilities & CAP_UNICODE) {
2365                 if ((long) bcc_ptr % 2) { /* must be word aligned for Unicode */
2366                         *bcc_ptr = 0;
2367                         bcc_ptr++;
2368                 }
2369                 if (user == NULL)
2370                         bytes_returned = 0; /* skip null user */
2371                 else
2372                         bytes_returned =
2373                                 cifs_strtoUCS((__le16 *) bcc_ptr, user, 100,
2374                                         nls_codepage);
2375                 /* convert number of 16 bit words to bytes */
2376                 bcc_ptr += 2 * bytes_returned;
2377                 bcc_ptr += 2;   /* trailing null */
2378                 if (domain == NULL)
2379                         bytes_returned =
2380                             cifs_strtoUCS((__le16 *) bcc_ptr,
2381                                           "CIFS_LINUX_DOM", 32, nls_codepage);
2382                 else
2383                         bytes_returned =
2384                             cifs_strtoUCS((__le16 *) bcc_ptr, domain, 64,
2385                                           nls_codepage);
2386                 bcc_ptr += 2 * bytes_returned;
2387                 bcc_ptr += 2;
2388                 bytes_returned =
2389                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
2390                                   32, nls_codepage);
2391                 bcc_ptr += 2 * bytes_returned;
2392                 bytes_returned =
2393                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release,
2394                                   32, nls_codepage);
2395                 bcc_ptr += 2 * bytes_returned;
2396                 bcc_ptr += 2;
2397                 bytes_returned =
2398                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
2399                                   64, nls_codepage);
2400                 bcc_ptr += 2 * bytes_returned;
2401                 bcc_ptr += 2;
2402         } else {
2403                 if (user != NULL) {
2404                     strncpy(bcc_ptr, user, 200);
2405                     bcc_ptr += strnlen(user, 200);
2406                 }
2407                 *bcc_ptr = 0;
2408                 bcc_ptr++;
2409                 if (domain == NULL) {
2410                         strcpy(bcc_ptr, "CIFS_LINUX_DOM");
2411                         bcc_ptr += strlen("CIFS_LINUX_DOM") + 1;
2412                 } else {
2413                         strncpy(bcc_ptr, domain, 64);
2414                         bcc_ptr += strnlen(domain, 64);
2415                         *bcc_ptr = 0;
2416                         bcc_ptr++;
2417                 }
2418                 strcpy(bcc_ptr, "Linux version ");
2419                 bcc_ptr += strlen("Linux version ");
2420                 strcpy(bcc_ptr, utsname()->release);
2421                 bcc_ptr += strlen(utsname()->release) + 1;
2422                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
2423                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
2424         }
2425         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
2426         smb_buffer->smb_buf_length += count;
2427         pSMB->req_no_secext.ByteCount = cpu_to_le16(count);
2428
2429         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
2430                          &bytes_returned, CIFS_LONG_OP);
2431         if (rc) {
2432 /* rc = map_smb_to_linux_error(smb_buffer_response); now done in SendReceive */
2433         } else if ((smb_buffer_response->WordCount == 3)
2434                    || (smb_buffer_response->WordCount == 4)) {
2435                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
2436                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
2437                 if (action & GUEST_LOGIN)
2438                         cFYI(1, (" Guest login")); /* BB mark SesInfo struct? */
2439                 ses->Suid = smb_buffer_response->Uid; /* UID left in wire format
2440                                                          (little endian) */
2441                 cFYI(1, ("UID = %d ", ses->Suid));
2442         /* response can have either 3 or 4 word count - Samba sends 3 */
2443                 bcc_ptr = pByteArea(smb_buffer_response);
2444                 if ((pSMBr->resp.hdr.WordCount == 3)
2445                     || ((pSMBr->resp.hdr.WordCount == 4)
2446                         && (blob_len < pSMBr->resp.ByteCount))) {
2447                         if (pSMBr->resp.hdr.WordCount == 4)
2448                                 bcc_ptr += blob_len;
2449
2450                         if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
2451                                 if ((long) (bcc_ptr) % 2) {
2452                                         remaining_words =
2453                                             (BCC(smb_buffer_response) - 1) / 2;
2454                                         /* Unicode strings must be word
2455                                            aligned */
2456                                         bcc_ptr++;
2457                                 } else {
2458                                         remaining_words =
2459                                                 BCC(smb_buffer_response) / 2;
2460                                 }
2461                                 len =
2462                                     UniStrnlen((wchar_t *) bcc_ptr,
2463                                                remaining_words - 1);
2464 /* We look for obvious messed up bcc or strings in response so we do not go off
2465    the end since (at least) WIN2K and Windows XP have a major bug in not null
2466    terminating last Unicode string in response  */
2467                                 if (ses->serverOS)
2468                                         kfree(ses->serverOS);
2469                                 ses->serverOS = kzalloc(2 * (len + 1),
2470                                                         GFP_KERNEL);
2471                                 if (ses->serverOS == NULL)
2472                                         goto sesssetup_nomem;
2473                                 cifs_strfromUCS_le(ses->serverOS,
2474                                                    (__le16 *)bcc_ptr,
2475                                                    len, nls_codepage);
2476                                 bcc_ptr += 2 * (len + 1);
2477                                 remaining_words -= len + 1;
2478                                 ses->serverOS[2 * len] = 0;
2479                                 ses->serverOS[1 + (2 * len)] = 0;
2480                                 if (remaining_words > 0) {
2481                                         len = UniStrnlen((wchar_t *)bcc_ptr,
2482                                                          remaining_words-1);
2483                                         kfree(ses->serverNOS);
2484                                         ses->serverNOS = kzalloc(2 * (len + 1),
2485                                                                  GFP_KERNEL);
2486                                         if (ses->serverNOS == NULL)
2487                                                 goto sesssetup_nomem;
2488                                         cifs_strfromUCS_le(ses->serverNOS,
2489                                                            (__le16 *)bcc_ptr,
2490                                                            len, nls_codepage);
2491                                         bcc_ptr += 2 * (len + 1);
2492                                         ses->serverNOS[2 * len] = 0;
2493                                         ses->serverNOS[1 + (2 * len)] = 0;
2494                                         if (strncmp(ses->serverNOS,
2495                                                 "NT LAN Manager 4", 16) == 0) {
2496                                                 cFYI(1, ("NT4 server"));
2497                                                 ses->flags |= CIFS_SES_NT4;
2498                                         }
2499                                         remaining_words -= len + 1;
2500                                         if (remaining_words > 0) {
2501                                                 len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
2502                                 /* last string is not always null terminated
2503                                    (for e.g. for Windows XP & 2000) */
2504                                                 if (ses->serverDomain)
2505                                                         kfree(ses->serverDomain);
2506                                                 ses->serverDomain =
2507                                                     kzalloc(2*(len+1),
2508                                                             GFP_KERNEL);
2509                                                 if (ses->serverDomain == NULL)
2510                                                         goto sesssetup_nomem;
2511                                                 cifs_strfromUCS_le(ses->serverDomain,
2512                                                         (__le16 *)bcc_ptr,
2513                                                         len, nls_codepage);
2514                                                 bcc_ptr += 2 * (len + 1);
2515                                                 ses->serverDomain[2*len] = 0;
2516                                                 ses->serverDomain[1+(2*len)] = 0;
2517                                         } else { /* else no more room so create
2518                                                   dummy domain string */
2519                                                 if (ses->serverDomain)
2520                                                         kfree(ses->serverDomain);
2521                                                 ses->serverDomain =
2522                                                         kzalloc(2, GFP_KERNEL);
2523                                         }
2524                                 } else { /* no room so create dummy domain
2525                                             and NOS string */
2526
2527                                         /* if these kcallocs fail not much we
2528                                            can do, but better to not fail the
2529                                            sesssetup itself */
2530                                         kfree(ses->serverDomain);
2531                                         ses->serverDomain =
2532                                             kzalloc(2, GFP_KERNEL);
2533                                         kfree(ses->serverNOS);
2534                                         ses->serverNOS =
2535                                             kzalloc(2, GFP_KERNEL);
2536                                 }
2537                         } else {        /* ASCII */
2538                                 len = strnlen(bcc_ptr, 1024);
2539                                 if (((long) bcc_ptr + len) - (long)
2540                                     pByteArea(smb_buffer_response)
2541                                             <= BCC(smb_buffer_response)) {
2542                                         kfree(ses->serverOS);
2543                                         ses->serverOS = kzalloc(len + 1,
2544                                                                 GFP_KERNEL);
2545                                         if (ses->serverOS == NULL)
2546                                                 goto sesssetup_nomem;
2547                                         strncpy(ses->serverOS, bcc_ptr, len);
2548
2549                                         bcc_ptr += len;
2550                                         /* null terminate the string */
2551                                         bcc_ptr[0] = 0;
2552                                         bcc_ptr++;
2553
2554                                         len = strnlen(bcc_ptr, 1024);
2555                                         kfree(ses->serverNOS);
2556                                         ses->serverNOS = kzalloc(len + 1,
2557                                                                  GFP_KERNEL);
2558                                         if (ses->serverNOS == NULL)
2559                                                 goto sesssetup_nomem;
2560                                         strncpy(ses->serverNOS, bcc_ptr, len);
2561                                         bcc_ptr += len;
2562                                         bcc_ptr[0] = 0;
2563                                         bcc_ptr++;
2564
2565                                         len = strnlen(bcc_ptr, 1024);
2566                                         if (ses->serverDomain)
2567                                                 kfree(ses->serverDomain);
2568                                         ses->serverDomain = kzalloc(len + 1,
2569                                                                     GFP_KERNEL);
2570                                         if (ses->serverDomain == NULL)
2571                                                 goto sesssetup_nomem;
2572                                         strncpy(ses->serverDomain, bcc_ptr,
2573                                                 len);
2574                                         bcc_ptr += len;
2575                                         bcc_ptr[0] = 0;
2576                                         bcc_ptr++;
2577                                 } else
2578                                         cFYI(1,
2579                                              ("Variable field of length %d "
2580                                                 "extends beyond end of smb ",
2581                                               len));
2582                         }
2583                 } else {
2584                         cERROR(1,
2585                                (" Security Blob Length extends beyond "
2586                                 "end of SMB"));
2587                 }
2588         } else {
2589                 cERROR(1,
2590                        (" Invalid Word count %d: ",
2591                         smb_buffer_response->WordCount));
2592                 rc = -EIO;
2593         }
2594 sesssetup_nomem:        /* do not return an error on nomem for the info strings,
2595                            since that could make reconnection harder, and
2596                            reconnection might be needed to free memory */
2597         cifs_buf_release(smb_buffer);
2598
2599         return rc;
2600 }
2601
2602 static int
2603 CIFSNTLMSSPNegotiateSessSetup(unsigned int xid,
2604                               struct cifsSesInfo *ses, bool *pNTLMv2_flag,
2605                               const struct nls_table *nls_codepage)
2606 {
2607         struct smb_hdr *smb_buffer;
2608         struct smb_hdr *smb_buffer_response;
2609         SESSION_SETUP_ANDX *pSMB;
2610         SESSION_SETUP_ANDX *pSMBr;
2611         char *bcc_ptr;
2612         char *domain;
2613         int rc = 0;
2614         int remaining_words = 0;
2615         int bytes_returned = 0;
2616         int len;
2617         int SecurityBlobLength = sizeof(NEGOTIATE_MESSAGE);
2618         PNEGOTIATE_MESSAGE SecurityBlob;
2619         PCHALLENGE_MESSAGE SecurityBlob2;
2620         __u32 negotiate_flags, capabilities;
2621         __u16 count;
2622
2623         cFYI(1, ("In NTLMSSP sesssetup (negotiate)"));
2624         if (ses == NULL)
2625                 return -EINVAL;
2626         domain = ses->domainName;
2627         *pNTLMv2_flag = false;
2628         smb_buffer = cifs_buf_get();
2629         if (smb_buffer == NULL) {
2630                 return -ENOMEM;
2631         }
2632         smb_buffer_response = smb_buffer;
2633         pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2634         pSMBr = (SESSION_SETUP_ANDX *) smb_buffer_response;
2635
2636         /* send SMBsessionSetup here */
2637         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2638                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2639
2640         smb_buffer->Mid = GetNextMid(ses->server);
2641         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2642         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2643
2644         pSMB->req.AndXCommand = 0xFF;
2645         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2646         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2647
2648         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2649                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2650
2651         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2652             CAP_EXTENDED_SECURITY;
2653         if (ses->capabilities & CAP_UNICODE) {
2654                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2655                 capabilities |= CAP_UNICODE;
2656         }
2657         if (ses->capabilities & CAP_STATUS32) {
2658                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2659                 capabilities |= CAP_STATUS32;
2660         }
2661         if (ses->capabilities & CAP_DFS) {
2662                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2663                 capabilities |= CAP_DFS;
2664         }
2665         pSMB->req.Capabilities = cpu_to_le32(capabilities);
2666
2667         bcc_ptr = (char *) &pSMB->req.SecurityBlob;
2668         SecurityBlob = (PNEGOTIATE_MESSAGE) bcc_ptr;
2669         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
2670         SecurityBlob->MessageType = NtLmNegotiate;
2671         negotiate_flags =
2672             NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_OEM |
2673             NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_NTLM |
2674             NTLMSSP_NEGOTIATE_56 |
2675             /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN | */ NTLMSSP_NEGOTIATE_128;
2676         if (sign_CIFS_PDUs)
2677                 negotiate_flags |= NTLMSSP_NEGOTIATE_SIGN;
2678 /*      if (ntlmv2_support)
2679                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;*/
2680         /* setup pointers to domain name and workstation name */
2681         bcc_ptr += SecurityBlobLength;
2682
2683         SecurityBlob->WorkstationName.Buffer = 0;
2684         SecurityBlob->WorkstationName.Length = 0;
2685         SecurityBlob->WorkstationName.MaximumLength = 0;
2686
2687         /* Domain not sent on first Sesssetup in NTLMSSP, instead it is sent
2688         along with username on auth request (ie the response to challenge) */
2689         SecurityBlob->DomainName.Buffer = 0;
2690         SecurityBlob->DomainName.Length = 0;
2691         SecurityBlob->DomainName.MaximumLength = 0;
2692         if (ses->capabilities & CAP_UNICODE) {
2693                 if ((long) bcc_ptr % 2) {
2694                         *bcc_ptr = 0;
2695                         bcc_ptr++;
2696                 }
2697
2698                 bytes_returned =
2699                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
2700                                   32, nls_codepage);
2701                 bcc_ptr += 2 * bytes_returned;
2702                 bytes_returned =
2703                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
2704                                   nls_codepage);
2705                 bcc_ptr += 2 * bytes_returned;
2706                 bcc_ptr += 2;   /* null terminate Linux version */
2707                 bytes_returned =
2708                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
2709                                   64, nls_codepage);
2710                 bcc_ptr += 2 * bytes_returned;
2711                 *(bcc_ptr + 1) = 0;
2712                 *(bcc_ptr + 2) = 0;
2713                 bcc_ptr += 2;   /* null terminate network opsys string */
2714                 *(bcc_ptr + 1) = 0;
2715                 *(bcc_ptr + 2) = 0;
2716                 bcc_ptr += 2;   /* null domain */
2717         } else {                /* ASCII */
2718                 strcpy(bcc_ptr, "Linux version ");
2719                 bcc_ptr += strlen("Linux version ");
2720                 strcpy(bcc_ptr, utsname()->release);
2721                 bcc_ptr += strlen(utsname()->release) + 1;
2722                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
2723                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
2724                 bcc_ptr++;      /* empty domain field */
2725                 *bcc_ptr = 0;
2726         }
2727         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
2728         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
2729         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
2730         smb_buffer->smb_buf_length += count;
2731         pSMB->req.ByteCount = cpu_to_le16(count);
2732
2733         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
2734                          &bytes_returned, CIFS_LONG_OP);
2735
2736         if (smb_buffer_response->Status.CifsError ==
2737             cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
2738                 rc = 0;
2739
2740         if (rc) {
2741 /*    rc = map_smb_to_linux_error(smb_buffer_response);  *//* done in SendReceive now */
2742         } else if ((smb_buffer_response->WordCount == 3)
2743                    || (smb_buffer_response->WordCount == 4)) {
2744                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
2745                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
2746
2747                 if (action & GUEST_LOGIN)
2748                         cFYI(1, (" Guest login"));
2749         /* Do we want to set anything in SesInfo struct when guest login? */
2750
2751                 bcc_ptr = pByteArea(smb_buffer_response);
2752         /* response can have either 3 or 4 word count - Samba sends 3 */
2753
2754                 SecurityBlob2 = (PCHALLENGE_MESSAGE) bcc_ptr;
2755                 if (SecurityBlob2->MessageType != NtLmChallenge) {
2756                         cFYI(1,
2757                              ("Unexpected NTLMSSP message type received %d",
2758                               SecurityBlob2->MessageType));
2759                 } else if (ses) {
2760                         ses->Suid = smb_buffer_response->Uid; /* UID left in le format */
2761                         cFYI(1, ("UID = %d", ses->Suid));
2762                         if ((pSMBr->resp.hdr.WordCount == 3)
2763                             || ((pSMBr->resp.hdr.WordCount == 4)
2764                                 && (blob_len <
2765                                     pSMBr->resp.ByteCount))) {
2766
2767                                 if (pSMBr->resp.hdr.WordCount == 4) {
2768                                         bcc_ptr += blob_len;
2769                                         cFYI(1, ("Security Blob Length %d",
2770                                               blob_len));
2771                                 }
2772
2773                                 cFYI(1, ("NTLMSSP Challenge rcvd"));
2774
2775                                 memcpy(ses->server->cryptKey,
2776                                        SecurityBlob2->Challenge,
2777                                        CIFS_CRYPTO_KEY_SIZE);
2778                                 if (SecurityBlob2->NegotiateFlags &
2779                                         cpu_to_le32(NTLMSSP_NEGOTIATE_NTLMV2))
2780                                         *pNTLMv2_flag = true;
2781
2782                                 if ((SecurityBlob2->NegotiateFlags &
2783                                         cpu_to_le32(NTLMSSP_NEGOTIATE_ALWAYS_SIGN))
2784                                         || (sign_CIFS_PDUs > 1))
2785                                                 ses->server->secMode |=
2786                                                         SECMODE_SIGN_REQUIRED;
2787                                 if ((SecurityBlob2->NegotiateFlags &
2788                                         cpu_to_le32(NTLMSSP_NEGOTIATE_SIGN)) && (sign_CIFS_PDUs))
2789                                                 ses->server->secMode |=
2790                                                         SECMODE_SIGN_ENABLED;
2791
2792                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
2793                                         if ((long) (bcc_ptr) % 2) {
2794                                                 remaining_words =
2795                                                     (BCC(smb_buffer_response)
2796                                                      - 1) / 2;
2797                                          /* Must word align unicode strings */
2798                                                 bcc_ptr++;
2799                                         } else {
2800                                                 remaining_words =
2801                                                     BCC
2802                                                     (smb_buffer_response) / 2;
2803                                         }
2804                                         len =
2805                                             UniStrnlen((wchar_t *) bcc_ptr,
2806                                                        remaining_words - 1);
2807 /* We look for obvious messed up bcc or strings in response so we do not go off
2808    the end since (at least) WIN2K and Windows XP have a major bug in not null
2809    terminating last Unicode string in response  */
2810                                         if (ses->serverOS)
2811                                                 kfree(ses->serverOS);
2812                                         ses->serverOS =
2813                                             kzalloc(2 * (len + 1), GFP_KERNEL);
2814                                         cifs_strfromUCS_le(ses->serverOS,
2815                                                            (__le16 *)
2816                                                            bcc_ptr, len,
2817                                                            nls_codepage);
2818                                         bcc_ptr += 2 * (len + 1);
2819                                         remaining_words -= len + 1;
2820                                         ses->serverOS[2 * len] = 0;
2821                                         ses->serverOS[1 + (2 * len)] = 0;
2822                                         if (remaining_words > 0) {
2823                                                 len = UniStrnlen((wchar_t *)
2824                                                                  bcc_ptr,
2825                                                                  remaining_words
2826                                                                  - 1);
2827                                                 kfree(ses->serverNOS);
2828                                                 ses->serverNOS =
2829                                                     kzalloc(2 * (len + 1),
2830                                                             GFP_KERNEL);
2831                                                 cifs_strfromUCS_le(ses->
2832                                                                    serverNOS,
2833                                                                    (__le16 *)
2834                                                                    bcc_ptr,
2835                                                                    len,
2836                                                                    nls_codepage);
2837                                                 bcc_ptr += 2 * (len + 1);
2838                                                 ses->serverNOS[2 * len] = 0;
2839                                                 ses->serverNOS[1 +
2840                                                                (2 * len)] = 0;
2841                                                 remaining_words -= len + 1;
2842                                                 if (remaining_words > 0) {
2843                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
2844                                 /* last string not always null terminated
2845                                    (for e.g. for Windows XP & 2000) */
2846                                                         kfree(ses->serverDomain);
2847                                                         ses->serverDomain =
2848                                                             kzalloc(2 *
2849                                                                     (len +
2850                                                                      1),
2851                                                                     GFP_KERNEL);
2852                                                         cifs_strfromUCS_le
2853                                                             (ses->serverDomain,
2854                                                              (__le16 *)bcc_ptr,
2855                                                              len, nls_codepage);
2856                                                         bcc_ptr +=
2857                                                             2 * (len + 1);
2858                                                         ses->serverDomain[2*len]
2859                                                             = 0;
2860                                                         ses->serverDomain
2861                                                                 [1 + (2 * len)]
2862                                                             = 0;
2863                                                 } /* else no more room so create dummy domain string */
2864                                                 else {
2865                                                         kfree(ses->serverDomain);
2866                                                         ses->serverDomain =
2867                                                             kzalloc(2,
2868                                                                     GFP_KERNEL);
2869                                                 }
2870                                         } else {        /* no room so create dummy domain and NOS string */
2871                                                 kfree(ses->serverDomain);
2872                                                 ses->serverDomain =
2873                                                     kzalloc(2, GFP_KERNEL);
2874                                                 kfree(ses->serverNOS);
2875                                                 ses->serverNOS =
2876                                                     kzalloc(2, GFP_KERNEL);
2877                                         }
2878                                 } else {        /* ASCII */
2879                                         len = strnlen(bcc_ptr, 1024);
2880                                         if (((long) bcc_ptr + len) - (long)
2881                                             pByteArea(smb_buffer_response)
2882                                             <= BCC(smb_buffer_response)) {
2883                                                 if (ses->serverOS)
2884                                                         kfree(ses->serverOS);
2885                                                 ses->serverOS =
2886                                                     kzalloc(len + 1,
2887                                                             GFP_KERNEL);
2888                                                 strncpy(ses->serverOS,
2889                                                         bcc_ptr, len);
2890
2891                                                 bcc_ptr += len;
2892                                                 bcc_ptr[0] = 0; /* null terminate string */
2893                                                 bcc_ptr++;
2894
2895                                                 len = strnlen(bcc_ptr, 1024);
2896                                                 kfree(ses->serverNOS);
2897                                                 ses->serverNOS =
2898                                                     kzalloc(len + 1,
2899                                                             GFP_KERNEL);
2900                                                 strncpy(ses->serverNOS, bcc_ptr, len);
2901                                                 bcc_ptr += len;
2902                                                 bcc_ptr[0] = 0;
2903                                                 bcc_ptr++;
2904
2905                                                 len = strnlen(bcc_ptr, 1024);
2906                                                 kfree(ses->serverDomain);
2907                                                 ses->serverDomain =
2908                                                     kzalloc(len + 1,
2909                                                             GFP_KERNEL);
2910                                                 strncpy(ses->serverDomain,
2911                                                         bcc_ptr, len);
2912                                                 bcc_ptr += len;
2913                                                 bcc_ptr[0] = 0;
2914                                                 bcc_ptr++;
2915                                         } else
2916                                                 cFYI(1,
2917                                                      ("field of length %d "
2918                                                     "extends beyond end of smb",
2919                                                       len));
2920                                 }
2921                         } else {
2922                                 cERROR(1, ("Security Blob Length extends beyond"
2923                                            " end of SMB"));
2924                         }
2925                 } else {
2926                         cERROR(1, ("No session structure passed in."));
2927                 }
2928         } else {
2929                 cERROR(1,
2930                        (" Invalid Word count %d:",
2931                         smb_buffer_response->WordCount));
2932                 rc = -EIO;
2933         }
2934
2935         cifs_buf_release(smb_buffer);
2936
2937         return rc;
2938 }
2939 static int
2940 CIFSNTLMSSPAuthSessSetup(unsigned int xid, struct cifsSesInfo *ses,
2941                         char *ntlm_session_key, bool ntlmv2_flag,
2942                         const struct nls_table *nls_codepage)
2943 {
2944         struct smb_hdr *smb_buffer;
2945         struct smb_hdr *smb_buffer_response;
2946         SESSION_SETUP_ANDX *pSMB;
2947         SESSION_SETUP_ANDX *pSMBr;
2948         char *bcc_ptr;
2949         char *user;
2950         char *domain;
2951         int rc = 0;
2952         int remaining_words = 0;
2953         int bytes_returned = 0;
2954         int len;
2955         int SecurityBlobLength = sizeof(AUTHENTICATE_MESSAGE);
2956         PAUTHENTICATE_MESSAGE SecurityBlob;
2957         __u32 negotiate_flags, capabilities;
2958         __u16 count;
2959
2960         cFYI(1, ("In NTLMSSPSessSetup (Authenticate)"));
2961         if (ses == NULL)
2962                 return -EINVAL;
2963         user = ses->userName;
2964         domain = ses->domainName;
2965         smb_buffer = cifs_buf_get();
2966         if (smb_buffer == NULL) {
2967                 return -ENOMEM;
2968         }
2969         smb_buffer_response = smb_buffer;
2970         pSMB = (SESSION_SETUP_ANDX *)smb_buffer;
2971         pSMBr = (SESSION_SETUP_ANDX *)smb_buffer_response;
2972
2973         /* send SMBsessionSetup here */
2974         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2975                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2976
2977         smb_buffer->Mid = GetNextMid(ses->server);
2978         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2979         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2980         pSMB->req.AndXCommand = 0xFF;
2981         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2982         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2983
2984         pSMB->req.hdr.Uid = ses->Suid;
2985
2986         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2987                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2988
2989         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2990                         CAP_EXTENDED_SECURITY;
2991         if (ses->capabilities & CAP_UNICODE) {
2992                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2993                 capabilities |= CAP_UNICODE;
2994         }
2995         if (ses->capabilities & CAP_STATUS32) {
2996                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2997                 capabilities |= CAP_STATUS32;
2998         }
2999         if (ses->capabilities & CAP_DFS) {
3000                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3001                 capabilities |= CAP_DFS;
3002         }
3003         pSMB->req.Capabilities = cpu_to_le32(capabilities);
3004
3005         bcc_ptr = (char *)&pSMB->req.SecurityBlob;
3006         SecurityBlob = (PAUTHENTICATE_MESSAGE)bcc_ptr;
3007         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
3008         SecurityBlob->MessageType = NtLmAuthenticate;
3009         bcc_ptr += SecurityBlobLength;
3010         negotiate_flags = NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_REQUEST_TARGET |
3011                         NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_TARGET_INFO |
3012                         0x80000000 | NTLMSSP_NEGOTIATE_128;
3013         if (sign_CIFS_PDUs)
3014                 negotiate_flags |= /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN |*/ NTLMSSP_NEGOTIATE_SIGN;
3015         if (ntlmv2_flag)
3016                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;
3017
3018 /* setup pointers to domain name and workstation name */
3019
3020         SecurityBlob->WorkstationName.Buffer = 0;
3021         SecurityBlob->WorkstationName.Length = 0;
3022         SecurityBlob->WorkstationName.MaximumLength = 0;
3023         SecurityBlob->SessionKey.Length = 0;
3024         SecurityBlob->SessionKey.MaximumLength = 0;
3025         SecurityBlob->SessionKey.Buffer = 0;
3026
3027         SecurityBlob->LmChallengeResponse.Length = 0;
3028         SecurityBlob->LmChallengeResponse.MaximumLength = 0;
3029         SecurityBlob->LmChallengeResponse.Buffer = 0;
3030
3031         SecurityBlob->NtChallengeResponse.Length =
3032             cpu_to_le16(CIFS_SESS_KEY_SIZE);
3033         SecurityBlob->NtChallengeResponse.MaximumLength =
3034             cpu_to_le16(CIFS_SESS_KEY_SIZE);
3035         memcpy(bcc_ptr, ntlm_session_key, CIFS_SESS_KEY_SIZE);
3036         SecurityBlob->NtChallengeResponse.Buffer =
3037             cpu_to_le32(SecurityBlobLength);
3038         SecurityBlobLength += CIFS_SESS_KEY_SIZE;
3039         bcc_ptr += CIFS_SESS_KEY_SIZE;
3040
3041         if (ses->capabilities & CAP_UNICODE) {
3042                 if (domain == NULL) {
3043                         SecurityBlob->DomainName.Buffer = 0;
3044                         SecurityBlob->DomainName.Length = 0;
3045                         SecurityBlob->DomainName.MaximumLength = 0;
3046                 } else {
3047                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, domain, 64,
3048                                           nls_codepage);
3049                         ln *= 2;
3050                         SecurityBlob->DomainName.MaximumLength =
3051                             cpu_to_le16(ln);
3052                         SecurityBlob->DomainName.Buffer =
3053                             cpu_to_le32(SecurityBlobLength);
3054                         bcc_ptr += ln;
3055                         SecurityBlobLength += ln;
3056                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
3057                 }
3058                 if (user == NULL) {
3059                         SecurityBlob->UserName.Buffer = 0;
3060                         SecurityBlob->UserName.Length = 0;
3061                         SecurityBlob->UserName.MaximumLength = 0;
3062                 } else {
3063                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, user, 64,
3064                                           nls_codepage);
3065                         ln *= 2;
3066                         SecurityBlob->UserName.MaximumLength =
3067                             cpu_to_le16(ln);
3068                         SecurityBlob->UserName.Buffer =
3069                             cpu_to_le32(SecurityBlobLength);
3070                         bcc_ptr += ln;
3071                         SecurityBlobLength += ln;
3072                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3073                 }
3074
3075                 /* SecurityBlob->WorkstationName.Length =
3076                  cifs_strtoUCS((__le16 *) bcc_ptr, "AMACHINE",64, nls_codepage);
3077                    SecurityBlob->WorkstationName.Length *= 2;
3078                    SecurityBlob->WorkstationName.MaximumLength =
3079                         cpu_to_le16(SecurityBlob->WorkstationName.Length);
3080                    SecurityBlob->WorkstationName.Buffer =
3081                                  cpu_to_le32(SecurityBlobLength);
3082                    bcc_ptr += SecurityBlob->WorkstationName.Length;
3083                    SecurityBlobLength += SecurityBlob->WorkstationName.Length;
3084                    SecurityBlob->WorkstationName.Length =
3085                         cpu_to_le16(SecurityBlob->WorkstationName.Length);  */
3086
3087                 if ((long) bcc_ptr % 2) {
3088                         *bcc_ptr = 0;
3089                         bcc_ptr++;
3090                 }
3091                 bytes_returned =
3092                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
3093                                   32, nls_codepage);
3094                 bcc_ptr += 2 * bytes_returned;
3095                 bytes_returned =
3096                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
3097                                   nls_codepage);
3098                 bcc_ptr += 2 * bytes_returned;
3099                 bcc_ptr += 2;   /* null term version string */
3100                 bytes_returned =
3101                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
3102                                   64, nls_codepage);
3103                 bcc_ptr += 2 * bytes_returned;
3104                 *(bcc_ptr + 1) = 0;
3105                 *(bcc_ptr + 2) = 0;
3106                 bcc_ptr += 2;   /* null terminate network opsys string */
3107                 *(bcc_ptr + 1) = 0;
3108                 *(bcc_ptr + 2) = 0;
3109                 bcc_ptr += 2;   /* null domain */
3110         } else {                /* ASCII */
3111                 if (domain == NULL) {
3112                         SecurityBlob->DomainName.Buffer = 0;
3113                         SecurityBlob->DomainName.Length = 0;
3114                         SecurityBlob->DomainName.MaximumLength = 0;
3115                 } else {
3116                         __u16 ln;
3117                         negotiate_flags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
3118                         strncpy(bcc_ptr, domain, 63);
3119                         ln = strnlen(domain, 64);
3120                         SecurityBlob->DomainName.MaximumLength =
3121                             cpu_to_le16(ln);
3122                         SecurityBlob->DomainName.Buffer =
3123                             cpu_to_le32(SecurityBlobLength);
3124                         bcc_ptr += ln;
3125                         SecurityBlobLength += ln;
3126                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
3127                 }
3128                 if (user == NULL) {
3129                         SecurityBlob->UserName.Buffer = 0;
3130                         SecurityBlob->UserName.Length = 0;
3131                         SecurityBlob->UserName.MaximumLength = 0;
3132                 } else {
3133                         __u16 ln;
3134                         strncpy(bcc_ptr, user, 63);
3135                         ln = strnlen(user, 64);
3136                         SecurityBlob->UserName.MaximumLength = cpu_to_le16(ln);
3137                         SecurityBlob->UserName.Buffer =
3138                                                 cpu_to_le32(SecurityBlobLength);
3139                         bcc_ptr += ln;
3140                         SecurityBlobLength += ln;
3141                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3142                 }
3143                 /* BB fill in our workstation name if known BB */
3144
3145                 strcpy(bcc_ptr, "Linux version ");
3146                 bcc_ptr += strlen("Linux version ");
3147                 strcpy(bcc_ptr, utsname()->release);
3148                 bcc_ptr += strlen(utsname()->release) + 1;
3149                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
3150                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
3151                 bcc_ptr++;      /* null domain */
3152                 *bcc_ptr = 0;
3153         }
3154         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
3155         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
3156         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
3157         smb_buffer->smb_buf_length += count;
3158         pSMB->req.ByteCount = cpu_to_le16(count);
3159
3160         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
3161                          &bytes_returned, CIFS_LONG_OP);
3162         if (rc) {
3163 /*   rc = map_smb_to_linux_error(smb_buffer_response) done in SendReceive now */
3164         } else if ((smb_buffer_response->WordCount == 3) ||
3165                    (smb_buffer_response->WordCount == 4)) {
3166                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
3167                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
3168                 if (action & GUEST_LOGIN)
3169                         cFYI(1, (" Guest login")); /* BB Should we set anything
3170                                                          in SesInfo struct ? */
3171 /*              if (SecurityBlob2->MessageType != NtLm??) {
3172                         cFYI("Unexpected message type on auth response is %d"));
3173                 } */
3174
3175                 if (ses) {
3176                         cFYI(1,
3177                              ("Check challenge UID %d vs auth response UID %d",
3178                               ses->Suid, smb_buffer_response->Uid));
3179                         /* UID left in wire format */
3180                         ses->Suid = smb_buffer_response->Uid;
3181                         bcc_ptr = pByteArea(smb_buffer_response);
3182                 /* response can have either 3 or 4 word count - Samba sends 3 */
3183                         if ((pSMBr->resp.hdr.WordCount == 3)
3184                             || ((pSMBr->resp.hdr.WordCount == 4)
3185                                 && (blob_len <
3186                                     pSMBr->resp.ByteCount))) {
3187                                 if (pSMBr->resp.hdr.WordCount == 4) {
3188                                         bcc_ptr +=
3189                                             blob_len;
3190                                         cFYI(1,
3191                                              ("Security Blob Length %d ",
3192                                               blob_len));
3193                                 }
3194
3195                                 cFYI(1,
3196                                      ("NTLMSSP response to Authenticate "));
3197
3198                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
3199                                         if ((long) (bcc_ptr) % 2) {
3200                                                 remaining_words =
3201                                                     (BCC(smb_buffer_response)
3202                                                      - 1) / 2;
3203                                                 bcc_ptr++;      /* Unicode strings must be word aligned */
3204                                         } else {
3205                                                 remaining_words = BCC(smb_buffer_response) / 2;
3206                                         }
3207                                         len = UniStrnlen((wchar_t *) bcc_ptr,
3208                                                         remaining_words - 1);
3209 /* We look for obvious messed up bcc or strings in response so we do not go off
3210   the end since (at least) WIN2K and Windows XP have a major bug in not null
3211   terminating last Unicode string in response  */
3212                                         if (ses->serverOS)
3213                                                 kfree(ses->serverOS);
3214                                         ses->serverOS =
3215                                             kzalloc(2 * (len + 1), GFP_KERNEL);
3216                                         cifs_strfromUCS_le(ses->serverOS,
3217                                                            (__le16 *)
3218                                                            bcc_ptr, len,
3219                                                            nls_codepage);
3220                                         bcc_ptr += 2 * (len + 1);
3221                                         remaining_words -= len + 1;
3222                                         ses->serverOS[2 * len] = 0;
3223                                         ses->serverOS[1 + (2 * len)] = 0;
3224                                         if (remaining_words > 0) {
3225                                                 len = UniStrnlen((wchar_t *)
3226                                                                  bcc_ptr,
3227                                                                  remaining_words
3228                                                                  - 1);
3229                                                 kfree(ses->serverNOS);
3230                                                 ses->serverNOS =
3231                                                     kzalloc(2 * (len + 1),
3232                                                             GFP_KERNEL);
3233                                                 cifs_strfromUCS_le(ses->
3234                                                                    serverNOS,
3235                                                                    (__le16 *)
3236                                                                    bcc_ptr,
3237                                                                    len,
3238                                                                    nls_codepage);
3239                                                 bcc_ptr += 2 * (len + 1);
3240                                                 ses->serverNOS[2 * len] = 0;
3241                                                 ses->serverNOS[1+(2*len)] = 0;
3242                                                 remaining_words -= len + 1;
3243                                                 if (remaining_words > 0) {
3244                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
3245      /* last string not always null terminated (e.g. for Windows XP & 2000) */
3246                                                         if (ses->serverDomain)
3247                                                                 kfree(ses->serverDomain);
3248                                                         ses->serverDomain =
3249                                                             kzalloc(2 *
3250                                                                     (len +
3251                                                                      1),
3252                                                                     GFP_KERNEL);
3253                                                         cifs_strfromUCS_le
3254                                                             (ses->
3255                                                              serverDomain,
3256                                                              (__le16 *)
3257                                                              bcc_ptr, len,
3258                                                              nls_codepage);
3259                                                         bcc_ptr +=
3260                                                             2 * (len + 1);
3261                                                         ses->
3262                                                             serverDomain[2
3263                                                                          * len]
3264                                                             = 0;
3265                                                         ses->
3266                                                             serverDomain[1
3267                                                                          +
3268                                                                          (2
3269                                                                           *
3270                                                                           len)]
3271                                                             = 0;
3272                                                 } /* else no more room so create dummy domain string */
3273                                                 else {
3274                                                         if (ses->serverDomain)
3275                                                                 kfree(ses->serverDomain);
3276                                                         ses->serverDomain = kzalloc(2,GFP_KERNEL);
3277                                                 }
3278                                         } else {  /* no room so create dummy domain and NOS string */
3279                                                 if (ses->serverDomain)
3280                                                         kfree(ses->serverDomain);
3281                                                 ses->serverDomain = kzalloc(2, GFP_KERNEL);
3282                                                 kfree(ses->serverNOS);
3283                                                 ses->serverNOS = kzalloc(2, GFP_KERNEL);
3284                                         }
3285                                 } else {        /* ASCII */
3286                                         len = strnlen(bcc_ptr, 1024);
3287                                         if (((long) bcc_ptr + len) -
3288                                            (long) pByteArea(smb_buffer_response)
3289                                                 <= BCC(smb_buffer_response)) {
3290                                                 if (ses->serverOS)
3291                                                         kfree(ses->serverOS);
3292                                                 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
3293                                                 strncpy(ses->serverOS,bcc_ptr, len);
3294
3295                                                 bcc_ptr += len;
3296                                                 bcc_ptr[0] = 0; /* null terminate the string */
3297                                                 bcc_ptr++;
3298
3299                                                 len = strnlen(bcc_ptr, 1024);
3300                                                 kfree(ses->serverNOS);
3301                                                 ses->serverNOS = kzalloc(len+1,
3302                                                                     GFP_KERNEL);
3303                                                 strncpy(ses->serverNOS,
3304                                                         bcc_ptr, len);
3305                                                 bcc_ptr += len;
3306                                                 bcc_ptr[0] = 0;
3307                                                 bcc_ptr++;
3308
3309                                                 len = strnlen(bcc_ptr, 1024);
3310                                                 if (ses->serverDomain)
3311                                                         kfree(ses->serverDomain);
3312                                                 ses->serverDomain =
3313                                                                 kzalloc(len+1,
3314                                                                     GFP_KERNEL);
3315                                                 strncpy(ses->serverDomain,
3316                                                         bcc_ptr, len);
3317                                                 bcc_ptr += len;
3318                                                 bcc_ptr[0] = 0;
3319                                                 bcc_ptr++;
3320                                         } else
3321                                                 cFYI(1, ("field of length %d "
3322                                                    "extends beyond end of smb ",
3323                                                       len));
3324                                 }
3325                         } else {
3326                                 cERROR(1, ("Security Blob extends beyond end "
3327                                         "of SMB"));
3328                         }
3329                 } else {
3330                         cERROR(1, ("No session structure passed in."));
3331                 }
3332         } else {
3333                 cERROR(1, ("Invalid Word count %d: ",
3334                         smb_buffer_response->WordCount));
3335                 rc = -EIO;
3336         }
3337
3338         cifs_buf_release(smb_buffer);
3339
3340         return rc;
3341 }
3342
3343 int
3344 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
3345          const char *tree, struct cifsTconInfo *tcon,
3346          const struct nls_table *nls_codepage)
3347 {
3348         struct smb_hdr *smb_buffer;
3349         struct smb_hdr *smb_buffer_response;
3350         TCONX_REQ *pSMB;
3351         TCONX_RSP *pSMBr;
3352         unsigned char *bcc_ptr;
3353         int rc = 0;
3354         int length;
3355         __u16 count;
3356
3357         if (ses == NULL)
3358                 return -EIO;
3359
3360         smb_buffer = cifs_buf_get();
3361         if (smb_buffer == NULL) {
3362                 return -ENOMEM;
3363         }
3364         smb_buffer_response = smb_buffer;
3365
3366         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3367                         NULL /*no tid */ , 4 /*wct */ );
3368
3369         smb_buffer->Mid = GetNextMid(ses->server);
3370         smb_buffer->Uid = ses->Suid;
3371         pSMB = (TCONX_REQ *) smb_buffer;
3372         pSMBr = (TCONX_RSP *) smb_buffer_response;
3373
3374         pSMB->AndXCommand = 0xFF;
3375         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3376         bcc_ptr = &pSMB->Password[0];
3377         if ((ses->server->secMode) & SECMODE_USER) {
3378                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
3379                 *bcc_ptr = 0; /* password is null byte */
3380                 bcc_ptr++;              /* skip password */
3381                 /* already aligned so no need to do it below */
3382         } else {
3383                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
3384                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3385                    specified as required (when that support is added to
3386                    the vfs in the future) as only NTLM or the much
3387                    weaker LANMAN (which we do not send by default) is accepted
3388                    by Samba (not sure whether other servers allow
3389                    NTLMv2 password here) */
3390 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3391                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
3392                         (ses->server->secType == LANMAN))
3393                         calc_lanman_hash(ses, bcc_ptr);
3394                 else
3395 #endif /* CIFS_WEAK_PW_HASH */
3396                 SMBNTencrypt(ses->password,
3397                              ses->server->cryptKey,
3398                              bcc_ptr);
3399
3400                 bcc_ptr += CIFS_SESS_KEY_SIZE;
3401                 if (ses->capabilities & CAP_UNICODE) {
3402                         /* must align unicode strings */
3403                         *bcc_ptr = 0; /* null byte password */
3404                         bcc_ptr++;
3405                 }
3406         }
3407
3408         if (ses->server->secMode &
3409                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3410                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3411
3412         if (ses->capabilities & CAP_STATUS32) {
3413                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3414         }
3415         if (ses->capabilities & CAP_DFS) {
3416                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3417         }
3418         if (ses->capabilities & CAP_UNICODE) {
3419                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3420                 length =
3421                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3422                         6 /* max utf8 char length in bytes */ *
3423                         (/* server len*/ + 256 /* share len */), nls_codepage);
3424                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3425                 bcc_ptr += 2;   /* skip trailing null */
3426         } else {                /* ASCII */
3427                 strcpy(bcc_ptr, tree);
3428                 bcc_ptr += strlen(tree) + 1;
3429         }
3430         strcpy(bcc_ptr, "?????");
3431         bcc_ptr += strlen("?????");
3432         bcc_ptr += 1;
3433         count = bcc_ptr - &pSMB->Password[0];
3434         pSMB->hdr.smb_buf_length += count;
3435         pSMB->ByteCount = cpu_to_le16(count);
3436
3437         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3438                          CIFS_STD_OP);
3439
3440         /* if (rc) rc = map_smb_to_linux_error(smb_buffer_response); */
3441         /* above now done in SendReceive */
3442         if ((rc == 0) && (tcon != NULL)) {
3443                 tcon->tidStatus = CifsGood;
3444                 tcon->tid = smb_buffer_response->Tid;
3445                 bcc_ptr = pByteArea(smb_buffer_response);
3446                 length = strnlen(bcc_ptr, BCC(smb_buffer_response) - 2);
3447                 /* skip service field (NB: this field is always ASCII) */
3448                 if (length == 3) {
3449                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3450                             (bcc_ptr[2] == 'C')) {
3451                                 cFYI(1, ("IPC connection"));
3452                                 tcon->ipc = 1;
3453                         }
3454                 } else if (length == 2) {
3455                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3456                                 /* the most common case */
3457                                 cFYI(1, ("disk share connection"));
3458                         }
3459                 }
3460                 bcc_ptr += length + 1;
3461                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3462                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
3463                         length = UniStrnlen((wchar_t *) bcc_ptr, 512);
3464                         if ((bcc_ptr + (2 * length)) -
3465                              pByteArea(smb_buffer_response) <=
3466                             BCC(smb_buffer_response)) {
3467                                 kfree(tcon->nativeFileSystem);
3468                                 tcon->nativeFileSystem =
3469                                     kzalloc(length + 2, GFP_KERNEL);
3470                                 if (tcon->nativeFileSystem)
3471                                         cifs_strfromUCS_le(
3472                                                 tcon->nativeFileSystem,
3473                                                 (__le16 *) bcc_ptr,
3474                                                 length, nls_codepage);
3475                                 bcc_ptr += 2 * length;
3476                                 bcc_ptr[0] = 0; /* null terminate the string */
3477                                 bcc_ptr[1] = 0;
3478                                 bcc_ptr += 2;
3479                         }
3480                         /* else do not bother copying these information fields*/
3481                 } else {
3482                         length = strnlen(bcc_ptr, 1024);
3483                         if ((bcc_ptr + length) -
3484                             pByteArea(smb_buffer_response) <=
3485                             BCC(smb_buffer_response)) {
3486                                 kfree(tcon->nativeFileSystem);
3487                                 tcon->nativeFileSystem =
3488                                     kzalloc(length + 1, GFP_KERNEL);
3489                                 if (tcon->nativeFileSystem)
3490                                         strncpy(tcon->nativeFileSystem, bcc_ptr,
3491                                                 length);
3492                         }
3493                         /* else do not bother copying these information fields*/
3494                 }
3495                 if ((smb_buffer_response->WordCount == 3) ||
3496                          (smb_buffer_response->WordCount == 7))
3497                         /* field is in same location */
3498                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3499                 else
3500                         tcon->Flags = 0;
3501                 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
3502         } else if ((rc == 0) && tcon == NULL) {
3503                 /* all we need to save for IPC$ connection */
3504                 ses->ipc_tid = smb_buffer_response->Tid;
3505         }
3506
3507         cifs_buf_release(smb_buffer);
3508         return rc;
3509 }
3510
3511 int
3512 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3513 {
3514         int rc = 0;
3515         int xid;
3516         struct cifsSesInfo *ses = NULL;
3517         struct task_struct *cifsd_task;
3518         char *tmp;
3519
3520         xid = GetXid();
3521
3522         if (cifs_sb->tcon) {
3523                 ses = cifs_sb->tcon->ses; /* save ptr to ses before delete tcon!*/
3524                 rc = CIFSSMBTDis(xid, cifs_sb->tcon);
3525                 if (rc == -EBUSY) {
3526                         FreeXid(xid);
3527                         return 0;
3528                 }
3529                 DeleteTconOplockQEntries(cifs_sb->tcon);
3530                 tconInfoFree(cifs_sb->tcon);
3531                 if ((ses) && (ses->server)) {
3532                         /* save off task so we do not refer to ses later */
3533                         cifsd_task = ses->server->tsk;
3534                         cFYI(1, ("About to do SMBLogoff "));
3535                         rc = CIFSSMBLogoff(xid, ses);
3536                         if (rc == -EBUSY) {
3537                                 FreeXid(xid);
3538                                 return 0;
3539                         } else if (rc == -ESHUTDOWN) {
3540                                 cFYI(1, ("Waking up socket by sending signal"));
3541                                 if (cifsd_task) {
3542                                         force_sig(SIGKILL, cifsd_task);
3543                                         kthread_stop(cifsd_task);
3544                                 }
3545                                 rc = 0;
3546                         } /* else - we have an smb session
3547                                 left on this socket do not kill cifsd */
3548                 } else
3549                         cFYI(1, ("No session or bad tcon"));
3550         }
3551
3552         cifs_sb->tcon = NULL;
3553         tmp = cifs_sb->prepath;
3554         cifs_sb->prepathlen = 0;
3555         cifs_sb->prepath = NULL;
3556         kfree(tmp);
3557         if (ses)
3558                 sesInfoFree(ses);
3559
3560         FreeXid(xid);
3561         return rc;
3562 }
3563
3564 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
3565                                            struct nls_table *nls_info)
3566 {
3567         int rc = 0;
3568         char ntlm_session_key[CIFS_SESS_KEY_SIZE];
3569         bool ntlmv2_flag = false;
3570         int first_time = 0;
3571
3572         /* what if server changes its buffer size after dropping the session? */
3573         if (pSesInfo->server->maxBuf == 0) /* no need to send on reconnect */ {
3574                 rc = CIFSSMBNegotiate(xid, pSesInfo);
3575                 if (rc == -EAGAIN) /* retry only once on 1st time connection */ {
3576                         rc = CIFSSMBNegotiate(xid, pSesInfo);
3577                         if (rc == -EAGAIN)
3578                                 rc = -EHOSTDOWN;
3579                 }
3580                 if (rc == 0) {
3581                         spin_lock(&GlobalMid_Lock);
3582                         if (pSesInfo->server->tcpStatus != CifsExiting)
3583                                 pSesInfo->server->tcpStatus = CifsGood;
3584                         else
3585                                 rc = -EHOSTDOWN;
3586                         spin_unlock(&GlobalMid_Lock);
3587
3588                 }
3589                 first_time = 1;
3590         }
3591         if (!rc) {
3592                 pSesInfo->flags = 0;
3593                 pSesInfo->capabilities = pSesInfo->server->capabilities;
3594                 if (linuxExtEnabled == 0)
3595                         pSesInfo->capabilities &= (~CAP_UNIX);
3596         /*      pSesInfo->sequence_number = 0;*/
3597                 cFYI(1,
3598                       ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3599                         pSesInfo->server->secMode,
3600                         pSesInfo->server->capabilities,
3601                         pSesInfo->server->timeAdj));
3602                 if (experimEnabled < 2)
3603                         rc = CIFS_SessSetup(xid, pSesInfo,
3604                                             first_time, nls_info);
3605                 else if (extended_security
3606                                 && (pSesInfo->capabilities
3607                                         & CAP_EXTENDED_SECURITY)
3608                                 && (pSesInfo->server->secType == NTLMSSP)) {
3609                         rc = -EOPNOTSUPP;
3610                 } else if (extended_security
3611                            && (pSesInfo->capabilities & CAP_EXTENDED_SECURITY)
3612                            && (pSesInfo->server->secType == RawNTLMSSP)) {
3613                         cFYI(1, ("NTLMSSP sesssetup"));
3614                         rc = CIFSNTLMSSPNegotiateSessSetup(xid,
3615                                                 pSesInfo,
3616                                                 &ntlmv2_flag,
3617                                                 nls_info);
3618                         if (!rc) {
3619                                 if (ntlmv2_flag) {
3620                                         char *v2_response;
3621                                         cFYI(1, ("more secure NTLM ver2 hash"));
3622                                         if (CalcNTLMv2_partial_mac_key(pSesInfo,
3623                                                 nls_info)) {
3624                                                 rc = -ENOMEM;
3625                                                 goto ss_err_exit;
3626                                         } else
3627                                                 v2_response = kmalloc(16 + 64 /* blob */, GFP_KERNEL);
3628                                         if (v2_response) {
3629                                                 CalcNTLMv2_response(pSesInfo,
3630                                                                    v2_response);
3631                                 /*              if (first_time)
3632                                                   cifs_calculate_ntlmv2_mac_key(
3633                                                    pSesInfo->server->mac_signing_key,
3634                                                    response, ntlm_session_key,*/
3635                                                 kfree(v2_response);
3636                                         /* BB Put dummy sig in SessSetup PDU? */
3637                                         } else {
3638                                                 rc = -ENOMEM;
3639                                                 goto ss_err_exit;
3640                                         }
3641
3642                                 } else {
3643                                         SMBNTencrypt(pSesInfo->password,
3644                                                 pSesInfo->server->cryptKey,
3645                                                 ntlm_session_key);
3646
3647                                         if (first_time)
3648                                                 cifs_calculate_mac_key(
3649                                                         &pSesInfo->server->mac_signing_key,
3650                                                         ntlm_session_key,
3651                                                         pSesInfo->password);
3652                                 }
3653                         /* for better security the weaker lanman hash not sent
3654                            in AuthSessSetup so we no longer calculate it */
3655
3656                                 rc = CIFSNTLMSSPAuthSessSetup(xid,
3657                                         pSesInfo,
3658                                         ntlm_session_key,
3659                                         ntlmv2_flag,
3660                                         nls_info);
3661                         }
3662                 } else { /* old style NTLM 0.12 session setup */
3663                         SMBNTencrypt(pSesInfo->password,
3664                                 pSesInfo->server->cryptKey,
3665                                 ntlm_session_key);
3666
3667                         if (first_time)
3668                                 cifs_calculate_mac_key(
3669                                         &pSesInfo->server->mac_signing_key,
3670                                         ntlm_session_key, pSesInfo->password);
3671
3672                         rc = CIFSSessSetup(xid, pSesInfo,
3673                                 ntlm_session_key, nls_info);
3674                 }
3675                 if (rc) {
3676                         cERROR(1, ("Send error in SessSetup = %d", rc));
3677                 } else {
3678                         cFYI(1, ("CIFS Session Established successfully"));
3679                         pSesInfo->status = CifsGood;
3680                 }
3681         }
3682 ss_err_exit:
3683         return rc;
3684 }
3685