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