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/pagemap.h>
  27 #include <linux/ctype.h>
  28 #include <linux/utsname.h>
  29 #include <linux/mempool.h>
  30 #include <linux/delay.h>
  31 #include <linux/completion.h>
  32 #include <linux/kthread.h>
  33 #include <linux/pagevec.h>
  34 #include <linux/freezer.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/processor.h>
  37 #include <net/ipv6.h>
  38 #include "cifspdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_unicode.h"
  42 #include "cifs_debug.h"
  43 #include "cifs_fs_sb.h"
  44 #include "ntlmssp.h"
  45 #include "nterr.h"
  46 #include "rfc1002pdu.h"
  47 #include "cn_cifs.h"
  48
  49 #define CIFS_PORT 445
  50 #define RFC1001_PORT 139
  51
  52 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  53                          unsigned char *p24);
  54
  55 extern mempool_t *cifs_req_poolp;
  56
  57 struct smb_vol {
  58         char *username;
  59         char *password;
  60         char *domainname;
  61         char *UNC;
  62         char *UNCip;
  63         char *in6_addr;   /* ipv6 address as human readable form of in6_addr */
  64         char *iocharset;  /* local code page for mapping to and from Unicode */
  65         char source_rfc1001_name[16]; /* netbios name of client */
  66         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  67         uid_t linux_uid;
  68         gid_t linux_gid;
  69         mode_t file_mode;
  70         mode_t dir_mode;
  71         unsigned secFlg;
  72         bool rw:1;
  73         bool retry:1;
  74         bool intr:1;
  75         bool setuids:1;
  76         bool override_uid:1;
  77         bool override_gid:1;
  78         bool dynperm:1;
  79         bool noperm:1;
  80         bool no_psx_acl:1; /* set if posix acl support should be disabled */
  81         bool cifs_acl:1;
  82         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
  83         bool server_ino:1; /* use inode numbers from server ie UniqueId */
  84         bool direct_io:1;
  85         bool remap:1;      /* set to remap seven reserved chars in filenames */
  86         bool posix_paths:1; /* unset to not ask for posix pathnames. */
  87         bool no_linux_ext:1;
  88         bool sfu_emul:1;
  89         bool nullauth:1;   /* attempt to authenticate with null user */
  90         bool nocase:1;     /* request case insensitive filenames */
  91         bool nobrl:1;      /* disable sending byte range locks to srv */
  92         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
  93         bool seal:1;       /* request transport encryption on share */
  94         bool nodfs:1;      /* Do not request DFS, even if available */
  95         bool local_lease:1; /* check leases only on local system, not remote */
  96         bool noblocksnd:1;
  97         bool noautotune:1;
  98         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
  99         unsigned int rsize;
 100         unsigned int wsize;
 101         unsigned int sockopt;
 102         unsigned short int port;
 103         char *prepath;
 104 };
 105
 106 static int ipv4_connect(struct TCP_Server_Info *server);
 107 static int ipv6_connect(struct TCP_Server_Info *server);
 108
 109 /*
 110  * cifs tcp session reconnection
 111  *
 112  * mark tcp session as reconnecting so temporarily locked
 113  * mark all smb sessions as reconnecting for tcp session
 114  * reconnect tcp session
 115  * wake up waiters on reconnection? - (not needed currently)
 116  */
 117 static int
 118 cifs_reconnect(struct TCP_Server_Info *server)
 119 {
 120         int rc = 0;
 121         struct list_head *tmp, *tmp2;
 122         struct cifsSesInfo *ses;
 123         struct cifsTconInfo *tcon;
 124         struct mid_q_entry *mid_entry;
 125
 126         spin_lock(&GlobalMid_Lock);
 127         if (server->tcpStatus == CifsExiting) {
 128                 /* the demux thread will exit normally
 129                 next time through the loop */
 130                 spin_unlock(&GlobalMid_Lock);
 131                 return rc;
 132         } else
 133                 server->tcpStatus = CifsNeedReconnect;
 134         spin_unlock(&GlobalMid_Lock);
 135         server->maxBuf = 0;
 136
 137         cFYI(1, ("Reconnecting tcp session"));
 138
 139         /* before reconnecting the tcp session, mark the smb session (uid)
 140                 and the tid bad so they are not used until reconnected */
 141         read_lock(&cifs_tcp_ses_lock);
 142         list_for_each(tmp, &server->smb_ses_list) {
 143                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 144                 ses->need_reconnect = true;
 145                 ses->ipc_tid = 0;
 146                 list_for_each(tmp2, &ses->tcon_list) {
 147                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 148                         tcon->need_reconnect = true;
 149                 }
 150         }
 151         read_unlock(&cifs_tcp_ses_lock);
 152         /* do not want to be sending data on a socket we are freeing */
 153         mutex_lock(&server->srv_mutex);
 154         if (server->ssocket) {
 155                 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
 156                         server->ssocket->flags));
 157                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 158                 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
 159                         server->ssocket->state,
 160                         server->ssocket->flags));
 161                 sock_release(server->ssocket);
 162                 server->ssocket = NULL;
 163         }
 164
 165         spin_lock(&GlobalMid_Lock);
 166         list_for_each(tmp, &server->pending_mid_q) {
 167                 mid_entry = list_entry(tmp, struct
 168                                         mid_q_entry,
 169                                         qhead);
 170                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 171                                 /* Mark other intransit requests as needing
 172                                    retry so we do not immediately mark the
 173                                    session bad again (ie after we reconnect
 174                                    below) as they timeout too */
 175                         mid_entry->midState = MID_RETRY_NEEDED;
 176                 }
 177         }
 178         spin_unlock(&GlobalMid_Lock);
 179         mutex_unlock(&server->srv_mutex);
 180
 181         while ((server->tcpStatus != CifsExiting) &&
 182                (server->tcpStatus != CifsGood)) {
 183                 try_to_freeze();
 184                 if (server->addr.sockAddr6.sin6_family == AF_INET6)
 185                         rc = ipv6_connect(server);
 186                 else
 187                         rc = ipv4_connect(server);
 188                 if (rc) {
 189                         cFYI(1, ("reconnect error %d", rc));
 190                         msleep(3000);
 191                 } else {
 192                         atomic_inc(&tcpSesReconnectCount);
 193                         spin_lock(&GlobalMid_Lock);
 194                         if (server->tcpStatus != CifsExiting)
 195                                 server->tcpStatus = CifsGood;
 196                         server->sequence_number = 0;
 197                         spin_unlock(&GlobalMid_Lock);
 198         /*              atomic_set(&server->inFlight,0);*/
 199                         wake_up(&server->response_q);
 200                 }
 201         }
 202         return rc;
 203 }
 204
 205 /*
 206         return codes:
 207                 0       not a transact2, or all data present
 208                 >0      transact2 with that much data missing
 209                 -EINVAL = invalid transact2
 210
 211  */
 212 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 213 {
 214         struct smb_t2_rsp *pSMBt;
 215         int total_data_size;
 216         int data_in_this_rsp;
 217         int remaining;
 218
 219         if (pSMB->Command != SMB_COM_TRANSACTION2)
 220                 return 0;
 221
 222         /* check for plausible wct, bcc and t2 data and parm sizes */
 223         /* check for parm and data offset going beyond end of smb */
 224         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 225                 cFYI(1, ("invalid transact2 word count"));
 226                 return -EINVAL;
 227         }
 228
 229         pSMBt = (struct smb_t2_rsp *)pSMB;
 230
 231         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 232         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 233
 234         remaining = total_data_size - data_in_this_rsp;
 235
 236         if (remaining == 0)
 237                 return 0;
 238         else if (remaining < 0) {
 239                 cFYI(1, ("total data %d smaller than data in frame %d",
 240                         total_data_size, data_in_this_rsp));
 241                 return -EINVAL;
 242         } else {
 243                 cFYI(1, ("missing %d bytes from transact2, check next response",
 244                         remaining));
 245                 if (total_data_size > maxBufSize) {
 246                         cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
 247                                 total_data_size, maxBufSize));
 248                         return -EINVAL;
 249                 }
 250                 return remaining;
 251         }
 252 }
 253
 254 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 255 {
 256         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 257         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 258         int total_data_size;
 259         int total_in_buf;
 260         int remaining;
 261         int total_in_buf2;
 262         char *data_area_of_target;
 263         char *data_area_of_buf2;
 264         __u16 byte_count;
 265
 266         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 267
 268         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 269                 cFYI(1, ("total data size of primary and secondary t2 differ"));
 270         }
 271
 272         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 273
 274         remaining = total_data_size - total_in_buf;
 275
 276         if (remaining < 0)
 277                 return -EINVAL;
 278
 279         if (remaining == 0) /* nothing to do, ignore */
 280                 return 0;
 281
 282         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 283         if (remaining < total_in_buf2) {
 284                 cFYI(1, ("transact2 2nd response contains too much data"));
 285         }
 286
 287         /* find end of first SMB data area */
 288         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 289                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 290         /* validate target area */
 291
 292         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 293                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 294
 295         data_area_of_target += total_in_buf;
 296
 297         /* copy second buffer into end of first buffer */
 298         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 299         total_in_buf += total_in_buf2;
 300         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 301         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 302         byte_count += total_in_buf2;
 303         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 304
 305         byte_count = pTargetSMB->smb_buf_length;
 306         byte_count += total_in_buf2;
 307
 308         /* BB also add check that we are not beyond maximum buffer size */
 309
 310         pTargetSMB->smb_buf_length = byte_count;
 311
 312         if (remaining == total_in_buf2) {
 313                 cFYI(1, ("found the last secondary response"));
 314                 return 0; /* we are done */
 315         } else /* more responses to go */
 316                 return 1;
 317
 318 }
 319
 320 static int
 321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 322 {
 323         int length;
 324         unsigned int pdu_length, total_read;
 325         struct smb_hdr *smb_buffer = NULL;
 326         struct smb_hdr *bigbuf = NULL;
 327         struct smb_hdr *smallbuf = NULL;
 328         struct msghdr smb_msg;
 329         struct kvec iov;
 330         struct socket *csocket = server->ssocket;
 331         struct list_head *tmp;
 332         struct cifsSesInfo *ses;
 333         struct task_struct *task_to_wake = NULL;
 334         struct mid_q_entry *mid_entry;
 335         char temp;
 336         bool isLargeBuf = false;
 337         bool isMultiRsp;
 338         int reconnect;
 339
 340         current->flags |= PF_MEMALLOC;
 341         cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
 342
 343         length = atomic_inc_return(&tcpSesAllocCount);
 344         if (length > 1)
 345                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 346                                 GFP_KERNEL);
 347
 348         set_freezable();
 349         while (server->tcpStatus != CifsExiting) {
 350                 if (try_to_freeze())
 351                         continue;
 352                 if (bigbuf == NULL) {
 353                         bigbuf = cifs_buf_get();
 354                         if (!bigbuf) {
 355                                 cERROR(1, ("No memory for large SMB response"));
 356                                 msleep(3000);
 357                                 /* retry will check if exiting */
 358                                 continue;
 359                         }
 360                 } else if (isLargeBuf) {
 361                         /* we are reusing a dirty large buf, clear its start */
 362                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 363                 }
 364
 365                 if (smallbuf == NULL) {
 366                         smallbuf = cifs_small_buf_get();
 367                         if (!smallbuf) {
 368                                 cERROR(1, ("No memory for SMB response"));
 369                                 msleep(1000);
 370                                 /* retry will check if exiting */
 371                                 continue;
 372                         }
 373                         /* beginning of smb buffer is cleared in our buf_get */
 374                 } else /* if existing small buf clear beginning */
 375                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 376
 377                 isLargeBuf = false;
 378                 isMultiRsp = false;
 379                 smb_buffer = smallbuf;
 380                 iov.iov_base = smb_buffer;
 381                 iov.iov_len = 4;
 382                 smb_msg.msg_control = NULL;
 383                 smb_msg.msg_controllen = 0;
 384                 pdu_length = 4; /* enough to get RFC1001 header */
 385 incomplete_rcv:
 386                 length =
 387                     kernel_recvmsg(csocket, &smb_msg,
 388                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 389
 390                 if (server->tcpStatus == CifsExiting) {
 391                         break;
 392                 } else if (server->tcpStatus == CifsNeedReconnect) {
 393                         cFYI(1, ("Reconnect after server stopped responding"));
 394                         cifs_reconnect(server);
 395                         cFYI(1, ("call to reconnect done"));
 396                         csocket = server->ssocket;
 397                         continue;
 398                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 399                         msleep(1); /* minimum sleep to prevent looping
 400                                 allowing socket to clear and app threads to set
 401                                 tcpStatus CifsNeedReconnect if server hung */
 402                         if (pdu_length < 4) {
 403                                 iov.iov_base = (4 - pdu_length) +
 404                                                         (char *)smb_buffer;
 405                                 iov.iov_len = pdu_length;
 406                                 smb_msg.msg_control = NULL;
 407                                 smb_msg.msg_controllen = 0;
 408                                 goto incomplete_rcv;
 409                         } else
 410                                 continue;
 411                 } else if (length <= 0) {
 412                         if (server->tcpStatus == CifsNew) {
 413                                 cFYI(1, ("tcp session abend after SMBnegprot"));
 414                                 /* some servers kill the TCP session rather than
 415                                    returning an SMB negprot error, in which
 416                                    case reconnecting here is not going to help,
 417                                    and so simply return error to mount */
 418                                 break;
 419                         }
 420                         if (!try_to_freeze() && (length == -EINTR)) {
 421                                 cFYI(1, ("cifsd thread killed"));
 422                                 break;
 423                         }
 424                         cFYI(1, ("Reconnect after unexpected peek error %d",
 425                                 length));
 426                         cifs_reconnect(server);
 427                         csocket = server->ssocket;
 428                         wake_up(&server->response_q);
 429                         continue;
 430                 } else if (length < pdu_length) {
 431                         cFYI(1, ("requested %d bytes but only got %d bytes",
 432                                   pdu_length, length));
 433                         pdu_length -= length;
 434                         msleep(1);
 435                         goto incomplete_rcv;
 436                 }
 437
 438                 /* The right amount was read from socket - 4 bytes */
 439                 /* so we can now interpret the length field */
 440
 441                 /* the first byte big endian of the length field,
 442                 is actually not part of the length but the type
 443                 with the most common, zero, as regular data */
 444                 temp = *((char *) smb_buffer);
 445
 446                 /* Note that FC 1001 length is big endian on the wire,
 447                 but we convert it here so it is always manipulated
 448                 as host byte order */
 449                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 450                 smb_buffer->smb_buf_length = pdu_length;
 451
 452                 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
 453
 454                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 455                         continue;
 456                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 457                         cFYI(1, ("Good RFC 1002 session rsp"));
 458                         continue;
 459                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 460                         /* we get this from Windows 98 instead of
 461                            an error on SMB negprot response */
 462                         cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
 463                                 pdu_length));
 464                         if (server->tcpStatus == CifsNew) {
 465                                 /* if nack on negprot (rather than
 466                                 ret of smb negprot error) reconnecting
 467                                 not going to help, ret error to mount */
 468                                 break;
 469                         } else {
 470                                 /* give server a second to
 471                                 clean up before reconnect attempt */
 472                                 msleep(1000);
 473                                 /* always try 445 first on reconnect
 474                                 since we get NACK on some if we ever
 475                                 connected to port 139 (the NACK is
 476                                 since we do not begin with RFC1001
 477                                 session initialize frame) */
 478                                 server->addr.sockAddr.sin_port =
 479                                         htons(CIFS_PORT);
 480                                 cifs_reconnect(server);
 481                                 csocket = server->ssocket;
 482                                 wake_up(&server->response_q);
 483                                 continue;
 484                         }
 485                 } else if (temp != (char) 0) {
 486                         cERROR(1, ("Unknown RFC 1002 frame"));
 487                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 488                                       length);
 489                         cifs_reconnect(server);
 490                         csocket = server->ssocket;
 491                         continue;
 492                 }
 493
 494                 /* else we have an SMB response */
 495                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 496                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 497                         cERROR(1, ("Invalid size SMB length %d pdu_length %d",
 498                                         length, pdu_length+4));
 499                         cifs_reconnect(server);
 500                         csocket = server->ssocket;
 501                         wake_up(&server->response_q);
 502                         continue;
 503                 }
 504
 505                 /* else length ok */
 506                 reconnect = 0;
 507
 508                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 509                         isLargeBuf = true;
 510                         memcpy(bigbuf, smallbuf, 4);
 511                         smb_buffer = bigbuf;
 512                 }
 513                 length = 0;
 514                 iov.iov_base = 4 + (char *)smb_buffer;
 515                 iov.iov_len = pdu_length;
 516                 for (total_read = 0; total_read < pdu_length;
 517                      total_read += length) {
 518                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 519                                                 pdu_length - total_read, 0);
 520                         if ((server->tcpStatus == CifsExiting) ||
 521                             (length == -EINTR)) {
 522                                 /* then will exit */
 523                                 reconnect = 2;
 524                                 break;
 525                         } else if (server->tcpStatus == CifsNeedReconnect) {
 526                                 cifs_reconnect(server);
 527                                 csocket = server->ssocket;
 528                                 /* Reconnect wakes up rspns q */
 529                                 /* Now we will reread sock */
 530                                 reconnect = 1;
 531                                 break;
 532                         } else if ((length == -ERESTARTSYS) ||
 533                                    (length == -EAGAIN)) {
 534                                 msleep(1); /* minimum sleep to prevent looping,
 535                                               allowing socket to clear and app
 536                                               threads to set tcpStatus
 537                                               CifsNeedReconnect if server hung*/
 538                                 length = 0;
 539                                 continue;
 540                         } else if (length <= 0) {
 541                                 cERROR(1, ("Received no data, expecting %d",
 542                                               pdu_length - total_read));
 543                                 cifs_reconnect(server);
 544                                 csocket = server->ssocket;
 545                                 reconnect = 1;
 546                                 break;
 547                         }
 548                 }
 549                 if (reconnect == 2)
 550                         break;
 551                 else if (reconnect == 1)
 552                         continue;
 553
 554                 length += 4; /* account for rfc1002 hdr */
 555
 556
 557                 dump_smb(smb_buffer, length);
 558                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 559                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 560                         continue;
 561                 }
 562
 563
 564                 task_to_wake = NULL;
 565                 spin_lock(&GlobalMid_Lock);
 566                 list_for_each(tmp, &server->pending_mid_q) {
 567                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 568
 569                         if ((mid_entry->mid == smb_buffer->Mid) &&
 570                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 571                             (mid_entry->command == smb_buffer->Command)) {
 572                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 573                                         /* We have a multipart transact2 resp */
 574                                         isMultiRsp = true;
 575                                         if (mid_entry->resp_buf) {
 576                                                 /* merge response - fix up 1st*/
 577                                                 if (coalesce_t2(smb_buffer,
 578                                                         mid_entry->resp_buf)) {
 579                                                         mid_entry->multiRsp =
 580                                                                  true;
 581                                                         break;
 582                                                 } else {
 583                                                         /* all parts received */
 584                                                         mid_entry->multiEnd =
 585                                                                  true;
 586                                                         goto multi_t2_fnd;
 587                                                 }
 588                                         } else {
 589                                                 if (!isLargeBuf) {
 590                                                         cERROR(1,("1st trans2 resp needs bigbuf"));
 591                                         /* BB maybe we can fix this up,  switch
 592                                            to already allocated large buffer? */
 593                                                 } else {
 594                                                         /* Have first buffer */
 595                                                         mid_entry->resp_buf =
 596                                                                  smb_buffer;
 597                                                         mid_entry->largeBuf =
 598                                                                  true;
 599                                                         bigbuf = NULL;
 600                                                 }
 601                                         }
 602                                         break;
 603                                 }
 604                                 mid_entry->resp_buf = smb_buffer;
 605                                 mid_entry->largeBuf = isLargeBuf;
 606 multi_t2_fnd:
 607                                 task_to_wake = mid_entry->tsk;
 608                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 609 #ifdef CONFIG_CIFS_STATS2
 610                                 mid_entry->when_received = jiffies;
 611 #endif
 612                                 /* so we do not time out requests to  server
 613                                 which is still responding (since server could
 614                                 be busy but not dead) */
 615                                 server->lstrp = jiffies;
 616                                 break;
 617                         }
 618                 }
 619                 spin_unlock(&GlobalMid_Lock);
 620                 if (task_to_wake) {
 621                         /* Was previous buf put in mpx struct for multi-rsp? */
 622                         if (!isMultiRsp) {
 623                                 /* smb buffer will be freed by user thread */
 624                                 if (isLargeBuf)
 625                                         bigbuf = NULL;
 626                                 else
 627                                         smallbuf = NULL;
 628                         }
 629                         wake_up_process(task_to_wake);
 630                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 631                            !isMultiRsp) {
 632                         cERROR(1, ("No task to wake, unknown frame received! "
 633                                    "NumMids %d", midCount.counter));
 634                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 635                                       sizeof(struct smb_hdr));
 636 #ifdef CONFIG_CIFS_DEBUG2
 637                         cifs_dump_detail(smb_buffer);
 638                         cifs_dump_mids(server);
 639 #endif /* CIFS_DEBUG2 */
 640
 641                 }
 642         } /* end while !EXITING */
 643
 644         /* take it off the list, if it's not already */
 645         write_lock(&cifs_tcp_ses_lock);
 646         list_del_init(&server->tcp_ses_list);
 647         write_unlock(&cifs_tcp_ses_lock);
 648
 649         spin_lock(&GlobalMid_Lock);
 650         server->tcpStatus = CifsExiting;
 651         spin_unlock(&GlobalMid_Lock);
 652         wake_up_all(&server->response_q);
 653
 654         /* check if we have blocked requests that need to free */
 655         /* Note that cifs_max_pending is normally 50, but
 656         can be set at module install time to as little as two */
 657         spin_lock(&GlobalMid_Lock);
 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         /*
 682          * BB: we shouldn't have to do any of this. It shouldn't be
 683          * possible to exit from the thread with active SMB sessions
 684          */
 685         read_lock(&cifs_tcp_ses_lock);
 686         if (list_empty(&server->pending_mid_q)) {
 687                 /* loop through server session structures attached to this and
 688                     mark them dead */
 689                 list_for_each(tmp, &server->smb_ses_list) {
 690                         ses = list_entry(tmp, struct cifsSesInfo,
 691                                          smb_ses_list);
 692                         ses->status = CifsExiting;
 693                         ses->server = NULL;
 694                 }
 695                 read_unlock(&cifs_tcp_ses_lock);
 696         } else {
 697                 /* although we can not zero the server struct pointer yet,
 698                 since there are active requests which may depnd on them,
 699                 mark the corresponding SMB sessions as exiting too */
 700                 list_for_each(tmp, &server->smb_ses_list) {
 701                         ses = list_entry(tmp, struct cifsSesInfo,
 702                                          smb_ses_list);
 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(&cifs_tcp_ses_lock);
 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         /* last chance to mark ses pointers invalid
 737         if there are any pointing to this (e.g
 738         if a crazy root user tried to kill cifsd
 739         kernel thread explicitly this might happen) */
 740         /* BB: This shouldn't be necessary, see above */
 741         read_lock(&cifs_tcp_ses_lock);
 742         list_for_each(tmp, &server->smb_ses_list) {
 743                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 744                 ses->server = NULL;
 745         }
 746         read_unlock(&cifs_tcp_ses_lock);
 747
 748         kfree(server->hostname);
 749         task_to_wake = xchg(&server->tsk, NULL);
 750         kfree(server);
 751
 752         length = atomic_dec_return(&tcpSesAllocCount);
 753         if (length  > 0)
 754                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 755                                 GFP_KERNEL);
 756
 757         /* if server->tsk was NULL then wait for a signal before exiting */
 758         if (!task_to_wake) {
 759                 set_current_state(TASK_INTERRUPTIBLE);
 760                 while (!signal_pending(current)) {
 761                         schedule();
 762                         set_current_state(TASK_INTERRUPTIBLE);
 763                 }
 764                 set_current_state(TASK_RUNNING);
 765         }
 766
 767         module_put_and_exit(0);
 768 }
 769
 770 /* extract the host portion of the UNC string */
 771 static char *
 772 extract_hostname(const char *unc)
 773 {
 774         const char *src;
 775         char *dst, *delim;
 776         unsigned int len;
 777
 778         /* skip double chars at beginning of string */
 779         /* BB: check validity of these bytes? */
 780         src = unc + 2;
 781
 782         /* delimiter between hostname and sharename is always '\\' now */
 783         delim = strchr(src, '\\');
 784         if (!delim)
 785                 return ERR_PTR(-EINVAL);
 786
 787         len = delim - src;
 788         dst = kmalloc((len + 1), GFP_KERNEL);
 789         if (dst == NULL)
 790                 return ERR_PTR(-ENOMEM);
 791
 792         memcpy(dst, src, len);
 793         dst[len] = '\0';
 794
 795         return dst;
 796 }
 797
 798 static int
 799 cifs_parse_mount_options(char *options, const char *devname,
 800                          struct smb_vol *vol)
 801 {
 802         char *value;
 803         char *data;
 804         unsigned int  temp_len, i, j;
 805         char separator[2];
 806
 807         separator[0] = ',';
 808         separator[1] = 0;
 809
 810         if (Local_System_Name[0] != 0)
 811                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 812         else {
 813                 char *nodename = utsname()->nodename;
 814                 int n = strnlen(nodename, 15);
 815                 memset(vol->source_rfc1001_name, 0x20, 15);
 816                 for (i = 0; i < n; i++) {
 817                         /* does not have to be perfect mapping since field is
 818                         informational, only used for servers that do not support
 819                         port 445 and it can be overridden at mount time */
 820                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 821                 }
 822         }
 823         vol->source_rfc1001_name[15] = 0;
 824         /* null target name indicates to use *SMBSERVR default called name
 825            if we end up sending RFC1001 session initialize */
 826         vol->target_rfc1001_name[0] = 0;
 827         vol->linux_uid = current_uid();  /* use current_euid() instead? */
 828         vol->linux_gid = current_gid();
 829         vol->dir_mode = S_IRWXUGO;
 830         /* 2767 perms indicate mandatory locking support */
 831         vol->file_mode = (S_IRWXUGO | S_ISGID) & (~S_IXGRP);
 832
 833         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 834         vol->rw = true;
 835         /* default is always to request posix paths. */
 836         vol->posix_paths = 1;
 837
 838         if (!options)
 839                 return 1;
 840
 841         if (strncmp(options, "sep=", 4) == 0) {
 842                 if (options[4] != 0) {
 843                         separator[0] = options[4];
 844                         options += 5;
 845                 } else {
 846                         cFYI(1, ("Null separator not allowed"));
 847                 }
 848         }
 849
 850         while ((data = strsep(&options, separator)) != NULL) {
 851                 if (!*data)
 852                         continue;
 853                 if ((value = strchr(data, '=')) != NULL)
 854                         *value++ = '\0';
 855
 856                 /* Have to parse this before we parse for "user" */
 857                 if (strnicmp(data, "user_xattr", 10) == 0) {
 858                         vol->no_xattr = 0;
 859                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 860                         vol->no_xattr = 1;
 861                 } else if (strnicmp(data, "user", 4) == 0) {
 862                         if (!value) {
 863                                 printk(KERN_WARNING
 864                                        "CIFS: invalid or missing username\n");
 865                                 return 1;       /* needs_arg; */
 866                         } else if (!*value) {
 867                                 /* null user, ie anonymous, authentication */
 868                                 vol->nullauth = 1;
 869                         }
 870                         if (strnlen(value, 200) < 200) {
 871                                 vol->username = value;
 872                         } else {
 873                                 printk(KERN_WARNING "CIFS: username too long\n");
 874                                 return 1;
 875                         }
 876                 } else if (strnicmp(data, "pass", 4) == 0) {
 877                         if (!value) {
 878                                 vol->password = NULL;
 879                                 continue;
 880                         } else if (value[0] == 0) {
 881                                 /* check if string begins with double comma
 882                                    since that would mean the password really
 883                                    does start with a comma, and would not
 884                                    indicate an empty string */
 885                                 if (value[1] != separator[0]) {
 886                                         vol->password = NULL;
 887                                         continue;
 888                                 }
 889                         }
 890                         temp_len = strlen(value);
 891                         /* removed password length check, NTLM passwords
 892                                 can be arbitrarily long */
 893
 894                         /* if comma in password, the string will be
 895                         prematurely null terminated.  Commas in password are
 896                         specified across the cifs mount interface by a double
 897                         comma ie ,, and a comma used as in other cases ie ','
 898                         as a parameter delimiter/separator is single and due
 899                         to the strsep above is temporarily zeroed. */
 900
 901                         /* NB: password legally can have multiple commas and
 902                         the only illegal character in a password is null */
 903
 904                         if ((value[temp_len] == 0) &&
 905                             (value[temp_len+1] == separator[0])) {
 906                                 /* reinsert comma */
 907                                 value[temp_len] = separator[0];
 908                                 temp_len += 2;  /* move after second comma */
 909                                 while (value[temp_len] != 0)  {
 910                                         if (value[temp_len] == separator[0]) {
 911                                                 if (value[temp_len+1] ==
 912                                                      separator[0]) {
 913                                                 /* skip second comma */
 914                                                         temp_len++;
 915                                                 } else {
 916                                                 /* single comma indicating start
 917                                                          of next parm */
 918                                                         break;
 919                                                 }
 920                                         }
 921                                         temp_len++;
 922                                 }
 923                                 if (value[temp_len] == 0) {
 924                                         options = NULL;
 925                                 } else {
 926                                         value[temp_len] = 0;
 927                                         /* point option to start of next parm */
 928                                         options = value + temp_len + 1;
 929                                 }
 930                                 /* go from value to value + temp_len condensing
 931                                 double commas to singles. Note that this ends up
 932                                 allocating a few bytes too many, which is ok */
 933                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 934                                 if (vol->password == NULL) {
 935                                         printk(KERN_WARNING "CIFS: no memory "
 936                                                             "for password\n");
 937                                         return 1;
 938                                 }
 939                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 940                                         vol->password[j] = value[i];
 941                                         if (value[i] == separator[0]
 942                                                 && value[i+1] == separator[0]) {
 943                                                 /* skip second comma */
 944                                                 i++;
 945                                         }
 946                                 }
 947                                 vol->password[j] = 0;
 948                         } else {
 949                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 950                                 if (vol->password == NULL) {
 951                                         printk(KERN_WARNING "CIFS: no memory "
 952                                                             "for password\n");
 953                                         return 1;
 954                                 }
 955                                 strcpy(vol->password, value);
 956                         }
 957                 } else if (strnicmp(data, "ip", 2) == 0) {
 958                         if (!value || !*value) {
 959                                 vol->UNCip = NULL;
 960                         } else if (strnlen(value, 35) < 35) {
 961                                 vol->UNCip = value;
 962                         } else {
 963                                 printk(KERN_WARNING "CIFS: ip address "
 964                                                     "too long\n");
 965                                 return 1;
 966                         }
 967                 } else if (strnicmp(data, "sec", 3) == 0) {
 968                         if (!value || !*value) {
 969                                 cERROR(1, ("no security value specified"));
 970                                 continue;
 971                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 972                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 973                                         CIFSSEC_MUST_SIGN;
 974                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 975                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 976                                         CIFSSEC_MAY_KRB5; */
 977                                 cERROR(1, ("Krb5 cifs privacy not supported"));
 978                                 return 1;
 979                         } else if (strnicmp(value, "krb5", 4) == 0) {
 980                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 981                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 982                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 983                                         CIFSSEC_MUST_SIGN;
 984                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 985                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 986                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
 987                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
 988                                         CIFSSEC_MUST_SIGN;
 989                         } else if (strnicmp(value, "ntlm", 4) == 0) {
 990                                 /* ntlm is default so can be turned off too */
 991                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
 992                         } else if (strnicmp(value, "nontlm", 6) == 0) {
 993                                 /* BB is there a better way to do this? */
 994                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 995 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 996                         } else if (strnicmp(value, "lanman", 6) == 0) {
 997                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
 998 #endif
 999                         } else if (strnicmp(value, "none", 4) == 0) {
1000                                 vol->nullauth = 1;
1001                         } else {
1002                                 cERROR(1, ("bad security option: %s", value));
1003                                 return 1;
1004                         }
1005                 } else if ((strnicmp(data, "unc", 3) == 0)
1006                            || (strnicmp(data, "target", 6) == 0)
1007                            || (strnicmp(data, "path", 4) == 0)) {
1008                         if (!value || !*value) {
1009                                 printk(KERN_WARNING "CIFS: invalid path to "
1010                                                     "network resource\n");
1011                                 return 1;       /* needs_arg; */
1012                         }
1013                         if ((temp_len = strnlen(value, 300)) < 300) {
1014                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1015                                 if (vol->UNC == NULL)
1016                                         return 1;
1017                                 strcpy(vol->UNC, value);
1018                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1019                                         vol->UNC[0] = '\\';
1020                                         vol->UNC[1] = '\\';
1021                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1022                                         printk(KERN_WARNING
1023                                                "CIFS: UNC Path does not begin "
1024                                                "with // or \\\\ \n");
1025                                         return 1;
1026                                 }
1027                         } else {
1028                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1029                                 return 1;
1030                         }
1031                 } else if ((strnicmp(data, "domain", 3) == 0)
1032                            || (strnicmp(data, "workgroup", 5) == 0)) {
1033                         if (!value || !*value) {
1034                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1035                                 return 1;       /* needs_arg; */
1036                         }
1037                         /* BB are there cases in which a comma can be valid in
1038                         a domain name and need special handling? */
1039                         if (strnlen(value, 256) < 256) {
1040                                 vol->domainname = value;
1041                                 cFYI(1, ("Domain name set"));
1042                         } else {
1043                                 printk(KERN_WARNING "CIFS: domain name too "
1044                                                     "long\n");
1045                                 return 1;
1046                         }
1047                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1048                         if (!value || !*value) {
1049                                 printk(KERN_WARNING
1050                                         "CIFS: invalid path prefix\n");
1051                                 return 1;       /* needs_argument */
1052                         }
1053                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1054                                 if (value[0] != '/')
1055                                         temp_len++;  /* missing leading slash */
1056                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1057                                 if (vol->prepath == NULL)
1058                                         return 1;
1059                                 if (value[0] != '/') {
1060                                         vol->prepath[0] = '/';
1061                                         strcpy(vol->prepath+1, value);
1062                                 } else
1063                                         strcpy(vol->prepath, value);
1064                                 cFYI(1, ("prefix path %s", vol->prepath));
1065                         } else {
1066                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1067                                 return 1;
1068                         }
1069                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1070                         if (!value || !*value) {
1071                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1072                                                     "specified\n");
1073                                 return 1;       /* needs_arg; */
1074                         }
1075                         if (strnlen(value, 65) < 65) {
1076                                 if (strnicmp(value, "default", 7))
1077                                         vol->iocharset = value;
1078                                 /* if iocharset not set then load_nls_default
1079                                    is used by caller */
1080                                 cFYI(1, ("iocharset set to %s", value));
1081                         } else {
1082                                 printk(KERN_WARNING "CIFS: iocharset name "
1083                                                     "too long.\n");
1084                                 return 1;
1085                         }
1086                 } else if (strnicmp(data, "uid", 3) == 0) {
1087                         if (value && *value) {
1088                                 vol->linux_uid =
1089                                         simple_strtoul(value, &value, 0);
1090                                 vol->override_uid = 1;
1091                         }
1092                 } else if (strnicmp(data, "gid", 3) == 0) {
1093                         if (value && *value) {
1094                                 vol->linux_gid =
1095                                         simple_strtoul(value, &value, 0);
1096                                 vol->override_gid = 1;
1097                         }
1098                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1099                         if (value && *value) {
1100                                 vol->file_mode =
1101                                         simple_strtoul(value, &value, 0);
1102                         }
1103                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1104                         if (value && *value) {
1105                                 vol->dir_mode =
1106                                         simple_strtoul(value, &value, 0);
1107                         }
1108                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1109                         if (value && *value) {
1110                                 vol->dir_mode =
1111                                         simple_strtoul(value, &value, 0);
1112                         }
1113                 } else if (strnicmp(data, "port", 4) == 0) {
1114                         if (value && *value) {
1115                                 vol->port =
1116                                         simple_strtoul(value, &value, 0);
1117                         }
1118                 } else if (strnicmp(data, "rsize", 5) == 0) {
1119                         if (value && *value) {
1120                                 vol->rsize =
1121                                         simple_strtoul(value, &value, 0);
1122                         }
1123                 } else if (strnicmp(data, "wsize", 5) == 0) {
1124                         if (value && *value) {
1125                                 vol->wsize =
1126                                         simple_strtoul(value, &value, 0);
1127                         }
1128                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1129                         if (value && *value) {
1130                                 vol->sockopt =
1131                                         simple_strtoul(value, &value, 0);
1132                         }
1133                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1134                         if (!value || !*value || (*value == ' ')) {
1135                                 cFYI(1, ("invalid (empty) netbiosname"));
1136                         } else {
1137                                 memset(vol->source_rfc1001_name, 0x20, 15);
1138                                 for (i = 0; i < 15; i++) {
1139                                 /* BB are there cases in which a comma can be
1140                                 valid in this workstation netbios name (and need
1141                                 special handling)? */
1142
1143                                 /* We do not uppercase netbiosname for user */
1144                                         if (value[i] == 0)
1145                                                 break;
1146                                         else
1147                                                 vol->source_rfc1001_name[i] =
1148                                                                 value[i];
1149                                 }
1150                                 /* The string has 16th byte zero still from
1151                                 set at top of the function  */
1152                                 if ((i == 15) && (value[i] != 0))
1153                                         printk(KERN_WARNING "CIFS: netbiosname"
1154                                                 " longer than 15 truncated.\n");
1155                         }
1156                 } else if (strnicmp(data, "servern", 7) == 0) {
1157                         /* servernetbiosname specified override *SMBSERVER */
1158                         if (!value || !*value || (*value == ' ')) {
1159                                 cFYI(1, ("empty server netbiosname specified"));
1160                         } else {
1161                                 /* last byte, type, is 0x20 for servr type */
1162                                 memset(vol->target_rfc1001_name, 0x20, 16);
1163
1164                                 for (i = 0; i < 15; i++) {
1165                                 /* BB are there cases in which a comma can be
1166                                    valid in this workstation netbios name
1167                                    (and need special handling)? */
1168
1169                                 /* user or mount helper must uppercase
1170                                    the netbiosname */
1171                                         if (value[i] == 0)
1172                                                 break;
1173                                         else
1174                                                 vol->target_rfc1001_name[i] =
1175                                                                 value[i];
1176                                 }
1177                                 /* The string has 16th byte zero still from
1178                                    set at top of the function  */
1179                                 if ((i == 15) && (value[i] != 0))
1180                                         printk(KERN_WARNING "CIFS: server net"
1181                                         "biosname longer than 15 truncated.\n");
1182                         }
1183                 } else if (strnicmp(data, "credentials", 4) == 0) {
1184                         /* ignore */
1185                 } else if (strnicmp(data, "version", 3) == 0) {
1186                         /* ignore */
1187                 } else if (strnicmp(data, "guest", 5) == 0) {
1188                         /* ignore */
1189                 } else if (strnicmp(data, "rw", 2) == 0) {
1190                         vol->rw = true;
1191                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1192                         vol->noblocksnd = 1;
1193                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1194                         vol->noautotune = 1;
1195                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1196                                    (strnicmp(data, "nosuid", 6) == 0) ||
1197                                    (strnicmp(data, "exec", 4) == 0) ||
1198                                    (strnicmp(data, "noexec", 6) == 0) ||
1199                                    (strnicmp(data, "nodev", 5) == 0) ||
1200                                    (strnicmp(data, "noauto", 6) == 0) ||
1201                                    (strnicmp(data, "dev", 3) == 0)) {
1202                         /*  The mount tool or mount.cifs helper (if present)
1203                             uses these opts to set flags, and the flags are read
1204                             by the kernel vfs layer before we get here (ie
1205                             before read super) so there is no point trying to
1206                             parse these options again and set anything and it
1207                             is ok to just ignore them */
1208                         continue;
1209                 } else if (strnicmp(data, "ro", 2) == 0) {
1210                         vol->rw = false;
1211                 } else if (strnicmp(data, "hard", 4) == 0) {
1212                         vol->retry = 1;
1213                 } else if (strnicmp(data, "soft", 4) == 0) {
1214                         vol->retry = 0;
1215                 } else if (strnicmp(data, "perm", 4) == 0) {
1216                         vol->noperm = 0;
1217                 } else if (strnicmp(data, "noperm", 6) == 0) {
1218                         vol->noperm = 1;
1219                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1220                         vol->remap = 1;
1221                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1222                         vol->remap = 0;
1223                 } else if (strnicmp(data, "sfu", 3) == 0) {
1224                         vol->sfu_emul = 1;
1225                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1226                         vol->sfu_emul = 0;
1227                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1228                         vol->nodfs = 1;
1229                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1230                         vol->posix_paths = 1;
1231                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1232                         vol->posix_paths = 0;
1233                 } else if (strnicmp(data, "nounix", 6) == 0) {
1234                         vol->no_linux_ext = 1;
1235                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1236                         vol->no_linux_ext = 1;
1237                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1238                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1239                         vol->nocase = 1;
1240                 } else if (strnicmp(data, "brl", 3) == 0) {
1241                         vol->nobrl =  0;
1242                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1243                            (strnicmp(data, "nolock", 6) == 0)) {
1244                         vol->nobrl =  1;
1245                         /* turn off mandatory locking in mode
1246                         if remote locking is turned off since the
1247                         local vfs will do advisory */
1248                         if (vol->file_mode ==
1249                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1250                                 vol->file_mode = S_IALLUGO;
1251                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1252                         /* will take the shorter form "forcemand" as well */
1253                         /* This mount option will force use of mandatory
1254                           (DOS/Windows style) byte range locks, instead of
1255                           using posix advisory byte range locks, even if the
1256                           Unix extensions are available and posix locks would
1257                           be supported otherwise. If Unix extensions are not
1258                           negotiated this has no effect since mandatory locks
1259                           would be used (mandatory locks is all that those
1260                           those servers support) */
1261                         vol->mand_lock = 1;
1262                 } else if (strnicmp(data, "setuids", 7) == 0) {
1263                         vol->setuids = 1;
1264                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1265                         vol->setuids = 0;
1266                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1267                         vol->dynperm = true;
1268                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1269                         vol->dynperm = false;
1270                 } else if (strnicmp(data, "nohard", 6) == 0) {
1271                         vol->retry = 0;
1272                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1273                         vol->retry = 1;
1274                 } else if (strnicmp(data, "nointr", 6) == 0) {
1275                         vol->intr = 0;
1276                 } else if (strnicmp(data, "intr", 4) == 0) {
1277                         vol->intr = 1;
1278                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1279                         vol->nostrictsync = 1;
1280                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1281                         vol->nostrictsync = 0;
1282                 } else if (strnicmp(data, "serverino", 7) == 0) {
1283                         vol->server_ino = 1;
1284                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1285                         vol->server_ino = 0;
1286                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1287                         vol->cifs_acl = 1;
1288                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1289                         vol->cifs_acl = 0;
1290                 } else if (strnicmp(data, "acl", 3) == 0) {
1291                         vol->no_psx_acl = 0;
1292                 } else if (strnicmp(data, "noacl", 5) == 0) {
1293                         vol->no_psx_acl = 1;
1294 #ifdef CONFIG_CIFS_EXPERIMENTAL
1295                 } else if (strnicmp(data, "locallease", 6) == 0) {
1296                         vol->local_lease = 1;
1297 #endif
1298                 } else if (strnicmp(data, "sign", 4) == 0) {
1299                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1300                 } else if (strnicmp(data, "seal", 4) == 0) {
1301                         /* we do not do the following in secFlags because seal
1302                            is a per tree connection (mount) not a per socket
1303                            or per-smb connection option in the protocol */
1304                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1305                         vol->seal = 1;
1306                 } else if (strnicmp(data, "direct", 6) == 0) {
1307                         vol->direct_io = 1;
1308                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1309                         vol->direct_io = 1;
1310                 } else if (strnicmp(data, "in6_addr", 8) == 0) {
1311                         if (!value || !*value) {
1312                                 vol->in6_addr = NULL;
1313                         } else if (strnlen(value, 49) == 48) {
1314                                 vol->in6_addr = value;
1315                         } else {
1316                                 printk(KERN_WARNING "CIFS: ip v6 address not "
1317                                                     "48 characters long\n");
1318                                 return 1;
1319                         }
1320                 } else if (strnicmp(data, "noac", 4) == 0) {
1321                         printk(KERN_WARNING "CIFS: Mount option noac not "
1322                                 "supported. Instead set "
1323                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1324                 } else
1325                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1326                                                 data);
1327         }
1328         if (vol->UNC == NULL) {
1329                 if (devname == NULL) {
1330                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1331                                                 "target\n");
1332                         return 1;
1333                 }
1334                 if ((temp_len = strnlen(devname, 300)) < 300) {
1335                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1336                         if (vol->UNC == NULL)
1337                                 return 1;
1338                         strcpy(vol->UNC, devname);
1339                         if (strncmp(vol->UNC, "//", 2) == 0) {
1340                                 vol->UNC[0] = '\\';
1341                                 vol->UNC[1] = '\\';
1342                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1343                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1344                                                     "begin with // or \\\\ \n");
1345                                 return 1;
1346                         }
1347                         value = strpbrk(vol->UNC+2, "/\\");
1348                         if (value)
1349                                 *value = '\\';
1350                 } else {
1351                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1352                         return 1;
1353                 }
1354         }
1355         if (vol->UNCip == NULL)
1356                 vol->UNCip = &vol->UNC[2];
1357
1358         return 0;
1359 }
1360
1361 static struct TCP_Server_Info *
1362 cifs_find_tcp_session(struct sockaddr_storage *addr)
1363 {
1364         struct list_head *tmp;
1365         struct TCP_Server_Info *server;
1366         struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1367         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1368
1369         write_lock(&cifs_tcp_ses_lock);
1370         list_for_each(tmp, &cifs_tcp_ses_list) {
1371                 server = list_entry(tmp, struct TCP_Server_Info,
1372                                     tcp_ses_list);
1373                 /*
1374                  * the demux thread can exit on its own while still in CifsNew
1375                  * so don't accept any sockets in that state. Since the
1376                  * tcpStatus never changes back to CifsNew it's safe to check
1377                  * for this without a lock.
1378                  */
1379                 if (server->tcpStatus == CifsNew)
1380                         continue;
1381
1382                 if (addr->ss_family == AF_INET &&
1383                     (addr4->sin_addr.s_addr !=
1384                      server->addr.sockAddr.sin_addr.s_addr))
1385                         continue;
1386                 else if (addr->ss_family == AF_INET6 &&
1387                          !ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1388                                           &addr6->sin6_addr))
1389                         continue;
1390
1391                 ++server->srv_count;
1392                 write_unlock(&cifs_tcp_ses_lock);
1393                 cFYI(1, ("Existing tcp session with server found"));
1394                 return server;
1395         }
1396         write_unlock(&cifs_tcp_ses_lock);
1397         return NULL;
1398 }
1399
1400 static void
1401 cifs_put_tcp_session(struct TCP_Server_Info *server)
1402 {
1403         struct task_struct *task;
1404
1405         write_lock(&cifs_tcp_ses_lock);
1406         if (--server->srv_count > 0) {
1407                 write_unlock(&cifs_tcp_ses_lock);
1408                 return;
1409         }
1410
1411         list_del_init(&server->tcp_ses_list);
1412         write_unlock(&cifs_tcp_ses_lock);
1413
1414         spin_lock(&GlobalMid_Lock);
1415         server->tcpStatus = CifsExiting;
1416         spin_unlock(&GlobalMid_Lock);
1417
1418         task = xchg(&server->tsk, NULL);
1419         if (task)
1420                 force_sig(SIGKILL, task);
1421 }
1422
1423 static struct TCP_Server_Info *
1424 cifs_get_tcp_session(struct smb_vol *volume_info)
1425 {
1426         struct TCP_Server_Info *tcp_ses = NULL;
1427         struct sockaddr_storage addr;
1428         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1429         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1430         int rc;
1431
1432         memset(&addr, 0, sizeof(struct sockaddr_storage));
1433
1434         if (volume_info->UNCip && volume_info->UNC) {
1435                 rc = cifs_inet_pton(AF_INET, volume_info->UNCip,
1436                                     &sin_server->sin_addr.s_addr);
1437
1438                 if (rc <= 0) {
1439                         /* not ipv4 address, try ipv6 */
1440                         rc = cifs_inet_pton(AF_INET6, volume_info->UNCip,
1441                                             &sin_server6->sin6_addr.in6_u);
1442                         if (rc > 0)
1443                                 addr.ss_family = AF_INET6;
1444                 } else {
1445                         addr.ss_family = AF_INET;
1446                 }
1447
1448                 if (rc <= 0) {
1449                         /* we failed translating address */
1450                         rc = -EINVAL;
1451                         goto out_err;
1452                 }
1453
1454                 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC,
1455                          volume_info->UNCip));
1456         } else if (volume_info->UNCip) {
1457                 /* BB using ip addr as tcp_ses name to connect to the
1458                    DFS root below */
1459                 cERROR(1, ("Connecting to DFS root not implemented yet"));
1460                 rc = -EINVAL;
1461                 goto out_err;
1462         } else /* which tcp_sess DFS root would we conect to */ {
1463                 cERROR(1,
1464                        ("CIFS mount error: No UNC path (e.g. -o "
1465                         "unc=//192.168.1.100/public) specified"));
1466                 rc = -EINVAL;
1467                 goto out_err;
1468         }
1469
1470         /* see if we already have a matching tcp_ses */
1471         tcp_ses = cifs_find_tcp_session(&addr);
1472         if (tcp_ses)
1473                 return tcp_ses;
1474
1475         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1476         if (!tcp_ses) {
1477                 rc = -ENOMEM;
1478                 goto out_err;
1479         }
1480
1481         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1482         if (IS_ERR(tcp_ses->hostname)) {
1483                 rc = PTR_ERR(tcp_ses->hostname);
1484                 goto out_err;
1485         }
1486
1487         tcp_ses->noblocksnd = volume_info->noblocksnd;
1488         tcp_ses->noautotune = volume_info->noautotune;
1489         atomic_set(&tcp_ses->inFlight, 0);
1490         init_waitqueue_head(&tcp_ses->response_q);
1491         init_waitqueue_head(&tcp_ses->request_q);
1492         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1493         mutex_init(&tcp_ses->srv_mutex);
1494         memcpy(tcp_ses->workstation_RFC1001_name,
1495                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1496         memcpy(tcp_ses->server_RFC1001_name,
1497                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1498         tcp_ses->sequence_number = 0;
1499         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1500         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1501
1502         /*
1503          * at this point we are the only ones with the pointer
1504          * to the struct since the kernel thread not created yet
1505          * no need to spinlock this init of tcpStatus or srv_count
1506          */
1507         tcp_ses->tcpStatus = CifsNew;
1508         ++tcp_ses->srv_count;
1509
1510         if (addr.ss_family == AF_INET6) {
1511                 cFYI(1, ("attempting ipv6 connect"));
1512                 /* BB should we allow ipv6 on port 139? */
1513                 /* other OS never observed in Wild doing 139 with v6 */
1514                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1515                         sizeof(struct sockaddr_in6));
1516                 sin_server6->sin6_port = htons(volume_info->port);
1517                 rc = ipv6_connect(tcp_ses);
1518         } else {
1519                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1520                         sizeof(struct sockaddr_in));
1521                 sin_server->sin_port = htons(volume_info->port);
1522                 rc = ipv4_connect(tcp_ses);
1523         }
1524         if (rc < 0) {
1525                 cERROR(1, ("Error connecting to socket. Aborting operation"));
1526                 goto out_err;
1527         }
1528
1529         /*
1530          * since we're in a cifs function already, we know that
1531          * this will succeed. No need for try_module_get().
1532          */
1533         __module_get(THIS_MODULE);
1534         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1535                                   tcp_ses, "cifsd");
1536         if (IS_ERR(tcp_ses->tsk)) {
1537                 rc = PTR_ERR(tcp_ses->tsk);
1538                 cERROR(1, ("error %d create cifsd thread", rc));
1539                 module_put(THIS_MODULE);
1540                 goto out_err;
1541         }
1542
1543         /* thread spawned, put it on the list */
1544         write_lock(&cifs_tcp_ses_lock);
1545         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1546         write_unlock(&cifs_tcp_ses_lock);
1547
1548         return tcp_ses;
1549
1550 out_err:
1551         if (tcp_ses) {
1552                 kfree(tcp_ses->hostname);
1553                 if (tcp_ses->ssocket)
1554                         sock_release(tcp_ses->ssocket);
1555                 kfree(tcp_ses);
1556         }
1557         return ERR_PTR(rc);
1558 }
1559
1560 static struct cifsSesInfo *
1561 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1562 {
1563         struct list_head *tmp;
1564         struct cifsSesInfo *ses;
1565
1566         write_lock(&cifs_tcp_ses_lock);
1567         list_for_each(tmp, &server->smb_ses_list) {
1568                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1569                 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1570                         continue;
1571
1572                 ++ses->ses_count;
1573                 write_unlock(&cifs_tcp_ses_lock);
1574                 return ses;
1575         }
1576         write_unlock(&cifs_tcp_ses_lock);
1577         return NULL;
1578 }
1579
1580 static void
1581 cifs_put_smb_ses(struct cifsSesInfo *ses)
1582 {
1583         int xid;
1584         struct TCP_Server_Info *server = ses->server;
1585
1586         write_lock(&cifs_tcp_ses_lock);
1587         if (--ses->ses_count > 0) {
1588                 write_unlock(&cifs_tcp_ses_lock);
1589                 return;
1590         }
1591
1592         list_del_init(&ses->smb_ses_list);
1593         write_unlock(&cifs_tcp_ses_lock);
1594
1595         if (ses->status == CifsGood) {
1596                 xid = GetXid();
1597                 CIFSSMBLogoff(xid, ses);
1598                 _FreeXid(xid);
1599         }
1600         sesInfoFree(ses);
1601         cifs_put_tcp_session(server);
1602 }
1603
1604 static struct cifsTconInfo *
1605 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1606 {
1607         struct list_head *tmp;
1608         struct cifsTconInfo *tcon;
1609
1610         write_lock(&cifs_tcp_ses_lock);
1611         list_for_each(tmp, &ses->tcon_list) {
1612                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1613                 if (tcon->tidStatus == CifsExiting)
1614                         continue;
1615                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1616                         continue;
1617
1618                 ++tcon->tc_count;
1619                 write_unlock(&cifs_tcp_ses_lock);
1620                 return tcon;
1621         }
1622         write_unlock(&cifs_tcp_ses_lock);
1623         return NULL;
1624 }
1625
1626 static void
1627 cifs_put_tcon(struct cifsTconInfo *tcon)
1628 {
1629         int xid;
1630         struct cifsSesInfo *ses = tcon->ses;
1631
1632         write_lock(&cifs_tcp_ses_lock);
1633         if (--tcon->tc_count > 0) {
1634                 write_unlock(&cifs_tcp_ses_lock);
1635                 return;
1636         }
1637
1638         list_del_init(&tcon->tcon_list);
1639         write_unlock(&cifs_tcp_ses_lock);
1640
1641         xid = GetXid();
1642         CIFSSMBTDis(xid, tcon);
1643         _FreeXid(xid);
1644
1645         DeleteTconOplockQEntries(tcon);
1646         tconInfoFree(tcon);
1647         cifs_put_smb_ses(ses);
1648 }
1649
1650 int
1651 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1652              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1653              struct dfs_info3_param **preferrals, int remap)
1654 {
1655         char *temp_unc;
1656         int rc = 0;
1657
1658         *pnum_referrals = 0;
1659         *preferrals = NULL;
1660
1661         if (pSesInfo->ipc_tid == 0) {
1662                 temp_unc = kmalloc(2 /* for slashes */ +
1663                         strnlen(pSesInfo->serverName,
1664                                 SERVER_NAME_LEN_WITH_NULL * 2)
1665                                  + 1 + 4 /* slash IPC$ */  + 2,
1666                                 GFP_KERNEL);
1667                 if (temp_unc == NULL)
1668                         return -ENOMEM;
1669                 temp_unc[0] = '\\';
1670                 temp_unc[1] = '\\';
1671                 strcpy(temp_unc + 2, pSesInfo->serverName);
1672                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1673                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1674                 cFYI(1,
1675                      ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1676                 kfree(temp_unc);
1677         }
1678         if (rc == 0)
1679                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1680                                      pnum_referrals, nls_codepage, remap);
1681         /* BB map targetUNCs to dfs_info3 structures, here or
1682                 in CIFSGetDFSRefer BB */
1683
1684         return rc;
1685 }
1686
1687 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1688 static struct lock_class_key cifs_key[2];
1689 static struct lock_class_key cifs_slock_key[2];
1690
1691 static inline void
1692 cifs_reclassify_socket4(struct socket *sock)
1693 {
1694         struct sock *sk = sock->sk;
1695         BUG_ON(sock_owned_by_user(sk));
1696         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1697                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1698 }
1699
1700 static inline void
1701 cifs_reclassify_socket6(struct socket *sock)
1702 {
1703         struct sock *sk = sock->sk;
1704         BUG_ON(sock_owned_by_user(sk));
1705         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1706                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1707 }
1708 #else
1709 static inline void
1710 cifs_reclassify_socket4(struct socket *sock)
1711 {
1712 }
1713
1714 static inline void
1715 cifs_reclassify_socket6(struct socket *sock)
1716 {
1717 }
1718 #endif
1719
1720 /* See RFC1001 section 14 on representation of Netbios names */
1721 static void rfc1002mangle(char *target, char *source, unsigned int length)
1722 {
1723         unsigned int i, j;
1724
1725         for (i = 0, j = 0; i < (length); i++) {
1726                 /* mask a nibble at a time and encode */
1727                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1728                 target[j+1] = 'A' + (0x0F & source[i]);
1729                 j += 2;
1730         }
1731
1732 }
1733
1734
1735 static int
1736 ipv4_connect(struct TCP_Server_Info *server)
1737 {
1738         int rc = 0;
1739         bool connected = false;
1740         __be16 orig_port = 0;
1741         struct socket *socket = server->ssocket;
1742
1743         if (socket == NULL) {
1744                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1745                                       IPPROTO_TCP, &socket);
1746                 if (rc < 0) {
1747                         cERROR(1, ("Error %d creating socket", rc));
1748                         return rc;
1749                 }
1750
1751                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1752                 cFYI(1, ("Socket created"));
1753                 server->ssocket = socket;
1754                 socket->sk->sk_allocation = GFP_NOFS;
1755                 cifs_reclassify_socket4(socket);
1756         }
1757
1758         /* user overrode default port */
1759         if (server->addr.sockAddr.sin_port) {
1760                 rc = socket->ops->connect(socket, (struct sockaddr *)
1761                                           &server->addr.sockAddr,
1762                                           sizeof(struct sockaddr_in), 0);
1763                 if (rc >= 0)
1764                         connected = true;
1765         }
1766
1767         if (!connected) {
1768                 /* save original port so we can retry user specified port
1769                         later if fall back ports fail this time  */
1770                 orig_port = server->addr.sockAddr.sin_port;
1771
1772                 /* do not retry on the same port we just failed on */
1773                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1774                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1775                         rc = socket->ops->connect(socket,
1776                                                 (struct sockaddr *)
1777                                                 &server->addr.sockAddr,
1778                                                 sizeof(struct sockaddr_in), 0);
1779                         if (rc >= 0)
1780                                 connected = true;
1781                 }
1782         }
1783         if (!connected) {
1784                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1785                 rc = socket->ops->connect(socket, (struct sockaddr *)
1786                                               &server->addr.sockAddr,
1787                                               sizeof(struct sockaddr_in), 0);
1788                 if (rc >= 0)
1789                         connected = true;
1790         }
1791
1792         /* give up here - unless we want to retry on different
1793                 protocol families some day */
1794         if (!connected) {
1795                 if (orig_port)
1796                         server->addr.sockAddr.sin_port = orig_port;
1797                 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1798                 sock_release(socket);
1799                 server->ssocket = NULL;
1800                 return rc;
1801         }
1802
1803
1804         /*
1805          * Eventually check for other socket options to change from
1806          *  the default. sock_setsockopt not used because it expects
1807          *  user space buffer
1808          */
1809         socket->sk->sk_rcvtimeo = 7 * HZ;
1810         socket->sk->sk_sndtimeo = 5 * HZ;
1811
1812         /* make the bufsizes depend on wsize/rsize and max requests */
1813         if (server->noautotune) {
1814                 if (socket->sk->sk_sndbuf < (200 * 1024))
1815                         socket->sk->sk_sndbuf = 200 * 1024;
1816                 if (socket->sk->sk_rcvbuf < (140 * 1024))
1817                         socket->sk->sk_rcvbuf = 140 * 1024;
1818         }
1819
1820          cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1821                  socket->sk->sk_sndbuf,
1822                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1823
1824         /* send RFC1001 sessinit */
1825         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1826                 /* some servers require RFC1001 sessinit before sending
1827                 negprot - BB check reconnection in case where second
1828                 sessinit is sent but no second negprot */
1829                 struct rfc1002_session_packet *ses_init_buf;
1830                 struct smb_hdr *smb_buf;
1831                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1832                                        GFP_KERNEL);
1833                 if (ses_init_buf) {
1834                         ses_init_buf->trailer.session_req.called_len = 32;
1835                         if (server->server_RFC1001_name &&
1836                             server->server_RFC1001_name[0] != 0)
1837                                 rfc1002mangle(ses_init_buf->trailer.
1838                                                 session_req.called_name,
1839                                               server->server_RFC1001_name,
1840                                               RFC1001_NAME_LEN_WITH_NULL);
1841                         else
1842                                 rfc1002mangle(ses_init_buf->trailer.
1843                                                 session_req.called_name,
1844                                               DEFAULT_CIFS_CALLED_NAME,
1845                                               RFC1001_NAME_LEN_WITH_NULL);
1846
1847                         ses_init_buf->trailer.session_req.calling_len = 32;
1848
1849                         /* calling name ends in null (byte 16) from old smb
1850                         convention. */
1851                         if (server->workstation_RFC1001_name &&
1852                             server->workstation_RFC1001_name[0] != 0)
1853                                 rfc1002mangle(ses_init_buf->trailer.
1854                                                 session_req.calling_name,
1855                                               server->workstation_RFC1001_name,
1856                                               RFC1001_NAME_LEN_WITH_NULL);
1857                         else
1858                                 rfc1002mangle(ses_init_buf->trailer.
1859                                                 session_req.calling_name,
1860                                               "LINUX_CIFS_CLNT",
1861                                               RFC1001_NAME_LEN_WITH_NULL);
1862
1863                         ses_init_buf->trailer.session_req.scope1 = 0;
1864                         ses_init_buf->trailer.session_req.scope2 = 0;
1865                         smb_buf = (struct smb_hdr *)ses_init_buf;
1866                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1867                         smb_buf->smb_buf_length = 0x81000044;
1868                         rc = smb_send(server, smb_buf, 0x44);
1869                         kfree(ses_init_buf);
1870                         msleep(1); /* RFC1001 layer in at least one server
1871                                       requires very short break before negprot
1872                                       presumably because not expecting negprot
1873                                       to follow so fast.  This is a simple
1874                                       solution that works without
1875                                       complicating the code and causes no
1876                                       significant slowing down on mount
1877                                       for everyone else */
1878                 }
1879                 /* else the negprot may still work without this
1880                 even though malloc failed */
1881
1882         }
1883
1884         return rc;
1885 }
1886
1887 static int
1888 ipv6_connect(struct TCP_Server_Info *server)
1889 {
1890         int rc = 0;
1891         bool connected = false;
1892         __be16 orig_port = 0;
1893         struct socket *socket = server->ssocket;
1894
1895         if (socket == NULL) {
1896                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1897                                       IPPROTO_TCP, &socket);
1898                 if (rc < 0) {
1899                         cERROR(1, ("Error %d creating ipv6 socket", rc));
1900                         socket = NULL;
1901                         return rc;
1902                 }
1903
1904                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1905                 cFYI(1, ("ipv6 Socket created"));
1906                 server->ssocket = socket;
1907                 socket->sk->sk_allocation = GFP_NOFS;
1908                 cifs_reclassify_socket6(socket);
1909         }
1910
1911         /* user overrode default port */
1912         if (server->addr.sockAddr6.sin6_port) {
1913                 rc = socket->ops->connect(socket,
1914                                 (struct sockaddr *) &server->addr.sockAddr6,
1915                                 sizeof(struct sockaddr_in6), 0);
1916                 if (rc >= 0)
1917                         connected = true;
1918         }
1919
1920         if (!connected) {
1921                 /* save original port so we can retry user specified port
1922                         later if fall back ports fail this time  */
1923
1924                 orig_port = server->addr.sockAddr6.sin6_port;
1925                 /* do not retry on the same port we just failed on */
1926                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1927                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1928                         rc = socket->ops->connect(socket, (struct sockaddr *)
1929                                         &server->addr.sockAddr6,
1930                                         sizeof(struct sockaddr_in6), 0);
1931                         if (rc >= 0)
1932                                 connected = true;
1933                 }
1934         }
1935         if (!connected) {
1936                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1937                 rc = socket->ops->connect(socket, (struct sockaddr *)
1938                                 &server->addr.sockAddr6,
1939                                 sizeof(struct sockaddr_in6), 0);
1940                 if (rc >= 0)
1941                         connected = true;
1942         }
1943
1944         /* give up here - unless we want to retry on different
1945                 protocol families some day */
1946         if (!connected) {
1947                 if (orig_port)
1948                         server->addr.sockAddr6.sin6_port = orig_port;
1949                 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1950                 sock_release(socket);
1951                 server->ssocket = NULL;
1952                 return rc;
1953         }
1954
1955         /*
1956          * Eventually check for other socket options to change from
1957          * the default. sock_setsockopt not used because it expects
1958          * user space buffer
1959          */
1960         socket->sk->sk_rcvtimeo = 7 * HZ;
1961         socket->sk->sk_sndtimeo = 5 * HZ;
1962         server->ssocket = socket;
1963
1964         return rc;
1965 }
1966
1967 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1968                           struct super_block *sb, struct smb_vol *vol_info)
1969 {
1970         /* if we are reconnecting then should we check to see if
1971          * any requested capabilities changed locally e.g. via
1972          * remount but we can not do much about it here
1973          * if they have (even if we could detect it by the following)
1974          * Perhaps we could add a backpointer to array of sb from tcon
1975          * or if we change to make all sb to same share the same
1976          * sb as NFS - then we only have one backpointer to sb.
1977          * What if we wanted to mount the server share twice once with
1978          * and once without posixacls or posix paths? */
1979         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1980
1981         if (vol_info && vol_info->no_linux_ext) {
1982                 tcon->fsUnixInfo.Capability = 0;
1983                 tcon->unix_ext = 0; /* Unix Extensions disabled */
1984                 cFYI(1, ("Linux protocol extensions disabled"));
1985                 return;
1986         } else if (vol_info)
1987                 tcon->unix_ext = 1; /* Unix Extensions supported */
1988
1989         if (tcon->unix_ext == 0) {
1990                 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1991                 return;
1992         }
1993
1994         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1995                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1996
1997                 /* check for reconnect case in which we do not
1998                    want to change the mount behavior if we can avoid it */
1999                 if (vol_info == NULL) {
2000                         /* turn off POSIX ACL and PATHNAMES if not set
2001                            originally at mount time */
2002                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2003                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2004                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2005                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2006                                         cERROR(1, ("POSIXPATH support change"));
2007                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2008                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2009                                 cERROR(1, ("possible reconnect error"));
2010                                 cERROR(1,
2011                                         ("server disabled POSIX path support"));
2012                         }
2013                 }
2014
2015                 cap &= CIFS_UNIX_CAP_MASK;
2016                 if (vol_info && vol_info->no_psx_acl)
2017                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2018                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2019                         cFYI(1, ("negotiated posix acl support"));
2020                         if (sb)
2021                                 sb->s_flags |= MS_POSIXACL;
2022                 }
2023
2024                 if (vol_info && vol_info->posix_paths == 0)
2025                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2026                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2027                         cFYI(1, ("negotiate posix pathnames"));
2028                         if (sb)
2029                                 CIFS_SB(sb)->mnt_cifs_flags |=
2030                                         CIFS_MOUNT_POSIX_PATHS;
2031                 }
2032
2033                 /* We might be setting the path sep back to a different
2034                 form if we are reconnecting and the server switched its
2035                 posix path capability for this share */
2036                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2037                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2038
2039                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2040                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2041                                 CIFS_SB(sb)->rsize = 127 * 1024;
2042                                 cFYI(DBG2,
2043                                         ("larger reads not supported by srv"));
2044                         }
2045                 }
2046
2047
2048                 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2049 #ifdef CONFIG_CIFS_DEBUG2
2050                 if (cap & CIFS_UNIX_FCNTL_CAP)
2051                         cFYI(1, ("FCNTL cap"));
2052                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2053                         cFYI(1, ("EXTATTR cap"));
2054                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2055                         cFYI(1, ("POSIX path cap"));
2056                 if (cap & CIFS_UNIX_XATTR_CAP)
2057                         cFYI(1, ("XATTR cap"));
2058                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2059                         cFYI(1, ("POSIX ACL cap"));
2060                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2061                         cFYI(1, ("very large read cap"));
2062                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2063                         cFYI(1, ("very large write cap"));
2064 #endif /* CIFS_DEBUG2 */
2065                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2066                         if (vol_info == NULL) {
2067                                 cFYI(1, ("resetting capabilities failed"));
2068                         } else
2069                                 cERROR(1, ("Negotiating Unix capabilities "
2070                                            "with the server failed.  Consider "
2071                                            "mounting with the Unix Extensions\n"
2072                                            "disabled, if problems are found, "
2073                                            "by specifying the nounix mount "
2074                                            "option."));
2075
2076                 }
2077         }
2078 }
2079
2080 static void
2081 convert_delimiter(char *path, char delim)
2082 {
2083         int i;
2084         char old_delim;
2085
2086         if (path == NULL)
2087                 return;
2088
2089         if (delim == '/')
2090                 old_delim = '\\';
2091         else
2092                 old_delim = '/';
2093
2094         for (i = 0; path[i] != '\0'; i++) {
2095                 if (path[i] == old_delim)
2096                         path[i] = delim;
2097         }
2098 }
2099
2100 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2101                           struct cifs_sb_info *cifs_sb)
2102 {
2103         if (pvolume_info->rsize > CIFSMaxBufSize) {
2104                 cERROR(1, ("rsize %d too large, using MaxBufSize",
2105                         pvolume_info->rsize));
2106                 cifs_sb->rsize = CIFSMaxBufSize;
2107         } else if ((pvolume_info->rsize) &&
2108                         (pvolume_info->rsize <= CIFSMaxBufSize))
2109                 cifs_sb->rsize = pvolume_info->rsize;
2110         else /* default */
2111                 cifs_sb->rsize = CIFSMaxBufSize;
2112
2113         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2114                 cERROR(1, ("wsize %d too large, using 4096 instead",
2115                           pvolume_info->wsize));
2116                 cifs_sb->wsize = 4096;
2117         } else if (pvolume_info->wsize)
2118                 cifs_sb->wsize = pvolume_info->wsize;
2119         else
2120                 cifs_sb->wsize = min_t(const int,
2121                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2122                                         127*1024);
2123                 /* old default of CIFSMaxBufSize was too small now
2124                    that SMB Write2 can send multiple pages in kvec.
2125                    RFC1001 does not describe what happens when frame
2126                    bigger than 128K is sent so use that as max in
2127                    conjunction with 52K kvec constraint on arch with 4K
2128                    page size  */
2129
2130         if (cifs_sb->rsize < 2048) {
2131                 cifs_sb->rsize = 2048;
2132                 /* Windows ME may prefer this */
2133                 cFYI(1, ("readsize set to minimum: 2048"));
2134         }
2135         /* calculate prepath */
2136         cifs_sb->prepath = pvolume_info->prepath;
2137         if (cifs_sb->prepath) {
2138                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2139                 /* we can not convert the / to \ in the path
2140                 separators in the prefixpath yet because we do not
2141                 know (until reset_cifs_unix_caps is called later)
2142                 whether POSIX PATH CAP is available. We normalize
2143                 the / to \ after reset_cifs_unix_caps is called */
2144                 pvolume_info->prepath = NULL;
2145         } else
2146                 cifs_sb->prepathlen = 0;
2147         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2148         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2149         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2150         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2151         cFYI(1, ("file mode: 0x%x  dir mode: 0x%x",
2152                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2153
2154         if (pvolume_info->noperm)
2155                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2156         if (pvolume_info->setuids)
2157                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2158         if (pvolume_info->server_ino)
2159                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2160         if (pvolume_info->remap)
2161                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2162         if (pvolume_info->no_xattr)
2163                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2164         if (pvolume_info->sfu_emul)
2165                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2166         if (pvolume_info->nobrl)
2167                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2168         if (pvolume_info->nostrictsync)
2169                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2170         if (pvolume_info->mand_lock)
2171                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2172         if (pvolume_info->cifs_acl)
2173                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2174         if (pvolume_info->override_uid)
2175                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2176         if (pvolume_info->override_gid)
2177                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2178         if (pvolume_info->dynperm)
2179                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2180         if (pvolume_info->direct_io) {
2181                 cFYI(1, ("mounting share using direct i/o"));
2182                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2183         }
2184
2185         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2186                 cERROR(1, ("mount option dynperm ignored if cifsacl "
2187                            "mount option supported"));
2188 }
2189
2190 static int
2191 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2192                    struct cifs_sb_info *cifs_sb, const char *full_path)
2193 {
2194         int rc;
2195         __u64 inode_num;
2196         FILE_ALL_INFO *pfile_info;
2197
2198         rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2199                                    cifs_sb->local_nls,
2200                                    cifs_sb->mnt_cifs_flags &
2201                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2202         if (rc != -EOPNOTSUPP)
2203                 return rc;
2204
2205         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2206         if (pfile_info == NULL)
2207                 return -ENOMEM;
2208
2209         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2210                               0 /* not legacy */, cifs_sb->local_nls,
2211                               cifs_sb->mnt_cifs_flags &
2212                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2213         kfree(pfile_info);
2214         return rc;
2215 }
2216
2217 static void
2218 cleanup_volume_info(struct smb_vol **pvolume_info)
2219 {
2220         struct smb_vol *volume_info;
2221
2222         if (!pvolume_info && !*pvolume_info)
2223                 return;
2224
2225         volume_info = *pvolume_info;
2226         kzfree(volume_info->password);
2227         kfree(volume_info->UNC);
2228         kfree(volume_info->prepath);
2229         kfree(volume_info);
2230         *pvolume_info = NULL;
2231         return;
2232 }
2233
2234 #ifdef CONFIG_CIFS_DFS_UPCALL
2235 /* build_path_to_root returns full path to root when
2236  * we do not have an exiting connection (tcon) */
2237 static char *
2238 build_unc_path_to_root(const struct smb_vol *volume_info,
2239                 const struct cifs_sb_info *cifs_sb)
2240 {
2241         char *full_path;
2242
2243         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2244         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2245         if (full_path == NULL)
2246                 return ERR_PTR(-ENOMEM);
2247
2248         strncpy(full_path, volume_info->UNC, unc_len);
2249         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2250                 int i;
2251                 for (i = 0; i < unc_len; i++) {
2252                         if (full_path[i] == '\\')
2253                                 full_path[i] = '/';
2254                 }
2255         }
2256
2257         if (cifs_sb->prepathlen)
2258                 strncpy(full_path + unc_len, cifs_sb->prepath,
2259                                 cifs_sb->prepathlen);
2260
2261         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2262         return full_path;
2263 }
2264 #endif
2265
2266 int
2267 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2268                 char *mount_data_global, const char *devname)
2269 {
2270         int rc = 0;
2271         int xid;
2272         struct smb_vol *volume_info;
2273         struct cifsSesInfo *pSesInfo = NULL;
2274         struct cifsTconInfo *tcon = NULL;
2275         struct TCP_Server_Info *srvTcp = NULL;
2276         char   *full_path;
2277         char *mount_data = mount_data_global;
2278 #ifdef CONFIG_CIFS_DFS_UPCALL
2279         struct dfs_info3_param *referrals = NULL;
2280         unsigned int num_referrals = 0;
2281 try_mount_again:
2282 #endif
2283         full_path = NULL;
2284
2285         xid = GetXid();
2286
2287         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2288         if (!volume_info) {
2289                 rc = -ENOMEM;
2290                 goto out;
2291         }
2292
2293         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2294                 rc = -EINVAL;
2295                 goto out;
2296         }
2297
2298         if (volume_info->nullauth) {
2299                 cFYI(1, ("null user"));
2300                 volume_info->username = "";
2301         } else if (volume_info->username) {
2302                 /* BB fixme parse for domain name here */
2303                 cFYI(1, ("Username: %s", volume_info->username));
2304         } else {
2305                 cifserror("No username specified");
2306         /* In userspace mount helper we can get user name from alternate
2307            locations such as env variables and files on disk */
2308                 rc = -EINVAL;
2309                 goto out;
2310         }
2311
2312
2313         /* this is needed for ASCII cp to Unicode converts */
2314         if (volume_info->iocharset == NULL) {
2315                 cifs_sb->local_nls = load_nls_default();
2316         /* load_nls_default can not return null */
2317         } else {
2318                 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2319                 if (cifs_sb->local_nls == NULL) {
2320                         cERROR(1, ("CIFS mount error: iocharset %s not found",
2321                                  volume_info->iocharset));
2322                         rc = -ELIBACC;
2323                         goto out;
2324                 }
2325         }
2326
2327         /* get a reference to a tcp session */
2328         srvTcp = cifs_get_tcp_session(volume_info);
2329         if (IS_ERR(srvTcp)) {
2330                 rc = PTR_ERR(srvTcp);
2331                 goto out;
2332         }
2333
2334         pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2335         if (pSesInfo) {
2336                 cFYI(1, ("Existing smb sess found (status=%d)",
2337                         pSesInfo->status));
2338                 /*
2339                  * The existing SMB session already has a reference to srvTcp,
2340                  * so we can put back the extra one we got before
2341                  */
2342                 cifs_put_tcp_session(srvTcp);
2343
2344                 down(&pSesInfo->sesSem);
2345                 if (pSesInfo->need_reconnect) {
2346                         cFYI(1, ("Session needs reconnect"));
2347                         rc = cifs_setup_session(xid, pSesInfo,
2348                                                 cifs_sb->local_nls);
2349                 }
2350                 up(&pSesInfo->sesSem);
2351         } else if (!rc) {
2352                 cFYI(1, ("Existing smb sess not found"));
2353                 pSesInfo = sesInfoAlloc();
2354                 if (pSesInfo == NULL) {
2355                         rc = -ENOMEM;
2356                         goto mount_fail_check;
2357                 }
2358
2359                 /* new SMB session uses our srvTcp ref */
2360                 pSesInfo->server = srvTcp;
2361                 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2362                         sprintf(pSesInfo->serverName, "%pI6",
2363                                 &srvTcp->addr.sockAddr6.sin6_addr);
2364                 else
2365                         sprintf(pSesInfo->serverName, "%pI4",
2366                                 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2367
2368                 write_lock(&cifs_tcp_ses_lock);
2369                 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2370                 write_unlock(&cifs_tcp_ses_lock);
2371
2372                 /* volume_info->password freed at unmount */
2373                 if (volume_info->password) {
2374                         pSesInfo->password = kstrdup(volume_info->password,
2375                                                      GFP_KERNEL);
2376                         if (!pSesInfo->password) {
2377                                 rc = -ENOMEM;
2378                                 goto mount_fail_check;
2379                         }
2380                 }
2381                 if (volume_info->username)
2382                         strncpy(pSesInfo->userName, volume_info->username,
2383                                 MAX_USERNAME_SIZE);
2384                 if (volume_info->domainname) {
2385                         int len = strlen(volume_info->domainname);
2386                         pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2387                         if (pSesInfo->domainName)
2388                                 strcpy(pSesInfo->domainName,
2389                                         volume_info->domainname);
2390                 }
2391                 pSesInfo->linux_uid = volume_info->linux_uid;
2392                 pSesInfo->overrideSecFlg = volume_info->secFlg;
2393                 down(&pSesInfo->sesSem);
2394
2395                 /* BB FIXME need to pass vol->secFlgs BB */
2396                 rc = cifs_setup_session(xid, pSesInfo,
2397                                         cifs_sb->local_nls);
2398                 up(&pSesInfo->sesSem);
2399         }
2400
2401         /* search for existing tcon to this server share */
2402         if (!rc) {
2403                 setup_cifs_sb(volume_info, cifs_sb);
2404
2405                 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2406                 if (tcon) {
2407                         cFYI(1, ("Found match on UNC path"));
2408                         /* existing tcon already has a reference */
2409                         cifs_put_smb_ses(pSesInfo);
2410                         if (tcon->seal != volume_info->seal)
2411                                 cERROR(1, ("transport encryption setting "
2412                                            "conflicts with existing tid"));
2413                 } else {
2414                         tcon = tconInfoAlloc();
2415                         if (tcon == NULL) {
2416                                 rc = -ENOMEM;
2417                                 goto mount_fail_check;
2418                         }
2419
2420                         tcon->ses = pSesInfo;
2421                         if (volume_info->password) {
2422                                 tcon->password = kstrdup(volume_info->password,
2423                                                          GFP_KERNEL);
2424                                 if (!tcon->password) {
2425                                         rc = -ENOMEM;
2426                                         goto mount_fail_check;
2427                                 }
2428                         }
2429
2430                         if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2431                             && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2432                                 cERROR(1, ("Missing share name"));
2433                                 rc = -ENODEV;
2434                                 goto mount_fail_check;
2435                         } else {
2436                                 /* BB Do we need to wrap sesSem around
2437                                  * this TCon call and Unix SetFS as
2438                                  * we do on SessSetup and reconnect? */
2439                                 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2440                                               tcon, cifs_sb->local_nls);
2441                                 cFYI(1, ("CIFS Tcon rc = %d", rc));
2442                                 if (volume_info->nodfs) {
2443                                         tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2444                                         cFYI(1, ("DFS disabled (%d)",
2445                                                 tcon->Flags));
2446                                 }
2447                         }
2448                         if (rc)
2449                                 goto remote_path_check;
2450                         tcon->seal = volume_info->seal;
2451                         write_lock(&cifs_tcp_ses_lock);
2452                         list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2453                         write_unlock(&cifs_tcp_ses_lock);
2454                 }
2455
2456                 /* we can have only one retry value for a connection
2457                    to a share so for resources mounted more than once
2458                    to the same server share the last value passed in
2459                    for the retry flag is used */
2460                 tcon->retry = volume_info->retry;
2461                 tcon->nocase = volume_info->nocase;
2462                 tcon->local_lease = volume_info->local_lease;
2463         }
2464         if (pSesInfo) {
2465                 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2466                         sb->s_maxbytes = (u64) 1 << 63;
2467                 } else
2468                         sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2469         }
2470
2471         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2472         sb->s_time_gran = 100;
2473
2474         if (rc)
2475                 goto remote_path_check;
2476
2477         cifs_sb->tcon = tcon;
2478
2479         /* do not care if following two calls succeed - informational */
2480         if (!tcon->ipc) {
2481                 CIFSSMBQFSDeviceInfo(xid, tcon);
2482                 CIFSSMBQFSAttributeInfo(xid, tcon);
2483         }
2484
2485         /* tell server which Unix caps we support */
2486         if (tcon->ses->capabilities & CAP_UNIX)
2487                 /* reset of caps checks mount to see if unix extensions
2488                    disabled for just this mount */
2489                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2490         else
2491                 tcon->unix_ext = 0; /* server does not support them */
2492
2493         /* convert forward to back slashes in prepath here if needed */
2494         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2495                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2496
2497         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2498                 cifs_sb->rsize = 1024 * 127;
2499                 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2500         }
2501         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2502                 cifs_sb->wsize = min(cifs_sb->wsize,
2503                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2504         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2505                 cifs_sb->rsize = min(cifs_sb->rsize,
2506                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2507
2508 remote_path_check:
2509         /* check if a whole path (including prepath) is not remote */
2510         if (!rc && cifs_sb->prepathlen && tcon) {
2511                 /* build_path_to_root works only when we have a valid tcon */
2512                 full_path = cifs_build_path_to_root(cifs_sb);
2513                 if (full_path == NULL) {
2514                         rc = -ENOMEM;
2515                         goto mount_fail_check;
2516                 }
2517                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2518                 if (rc != -EREMOTE) {
2519                         kfree(full_path);
2520                         goto mount_fail_check;
2521                 }
2522                 kfree(full_path);
2523         }
2524
2525         /* get referral if needed */
2526         if (rc == -EREMOTE) {
2527 #ifdef CONFIG_CIFS_DFS_UPCALL
2528                 /* convert forward to back slashes in prepath here if needed */
2529                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2530                         convert_delimiter(cifs_sb->prepath,
2531                                         CIFS_DIR_SEP(cifs_sb));
2532                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2533                 if (IS_ERR(full_path)) {
2534                         rc = PTR_ERR(full_path);
2535                         goto mount_fail_check;
2536                 }
2537
2538                 cFYI(1, ("Getting referral for: %s", full_path));
2539                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2540                         cifs_sb->local_nls, &num_referrals, &referrals,
2541                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2542                 if (!rc && num_referrals > 0) {
2543                         char *fake_devname = NULL;
2544
2545                         if (mount_data != mount_data_global)
2546                                 kfree(mount_data);
2547                         mount_data = cifs_compose_mount_options(
2548                                         cifs_sb->mountdata, full_path + 1,
2549                                         referrals, &fake_devname);
2550                         kfree(fake_devname);
2551                         free_dfs_info_array(referrals, num_referrals);
2552
2553                         if (tcon)
2554                                 cifs_put_tcon(tcon);
2555                         else if (pSesInfo)
2556                                 cifs_put_smb_ses(pSesInfo);
2557
2558                         cleanup_volume_info(&volume_info);
2559                         FreeXid(xid);
2560                         kfree(full_path);
2561                         goto try_mount_again;
2562                 }
2563 #else /* No DFS support, return error on mount */
2564                 rc = -EOPNOTSUPP;
2565 #endif
2566         }
2567
2568 mount_fail_check:
2569         /* on error free sesinfo and tcon struct if needed */
2570         if (rc) {
2571                 if (mount_data != mount_data_global)
2572                         kfree(mount_data);
2573                 /* If find_unc succeeded then rc == 0 so we can not end */
2574                 /* up accidently freeing someone elses tcon struct */
2575                 if (tcon)
2576                         cifs_put_tcon(tcon);
2577                 else if (pSesInfo)
2578                         cifs_put_smb_ses(pSesInfo);
2579                 else
2580                         cifs_put_tcp_session(srvTcp);
2581                 goto out;
2582         }
2583
2584         /* volume_info->password is freed above when existing session found
2585         (in which case it is not needed anymore) but when new sesion is created
2586         the password ptr is put in the new session structure (in which case the
2587         password will be freed at unmount time) */
2588 out:
2589         /* zero out password before freeing */
2590         cleanup_volume_info(&volume_info);
2591         FreeXid(xid);
2592         return rc;
2593 }
2594
2595 static int
2596 CIFSNTLMSSPNegotiateSessSetup(unsigned int xid,
2597                               struct cifsSesInfo *ses, bool *pNTLMv2_flag,
2598                               const struct nls_table *nls_codepage)
2599 {
2600         struct smb_hdr *smb_buffer;
2601         struct smb_hdr *smb_buffer_response;
2602         SESSION_SETUP_ANDX *pSMB;
2603         SESSION_SETUP_ANDX *pSMBr;
2604         char *bcc_ptr;
2605         char *domain;
2606         int rc = 0;
2607         int remaining_words = 0;
2608         int bytes_returned = 0;
2609         int len;
2610         int SecurityBlobLength = sizeof(NEGOTIATE_MESSAGE);
2611         PNEGOTIATE_MESSAGE SecurityBlob;
2612         PCHALLENGE_MESSAGE SecurityBlob2;
2613         __u32 negotiate_flags, capabilities;
2614         __u16 count;
2615
2616         cFYI(1, ("In NTLMSSP sesssetup (negotiate)"));
2617         if (ses == NULL)
2618                 return -EINVAL;
2619         domain = ses->domainName;
2620         *pNTLMv2_flag = false;
2621         smb_buffer = cifs_buf_get();
2622         if (smb_buffer == NULL) {
2623                 return -ENOMEM;
2624         }
2625         smb_buffer_response = smb_buffer;
2626         pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2627         pSMBr = (SESSION_SETUP_ANDX *) smb_buffer_response;
2628
2629         /* send SMBsessionSetup here */
2630         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2631                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2632
2633         smb_buffer->Mid = GetNextMid(ses->server);
2634         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2635         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2636
2637         pSMB->req.AndXCommand = 0xFF;
2638         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2639         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2640
2641         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2642                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2643
2644         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2645             CAP_EXTENDED_SECURITY;
2646         if (ses->capabilities & CAP_UNICODE) {
2647                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2648                 capabilities |= CAP_UNICODE;
2649         }
2650         if (ses->capabilities & CAP_STATUS32) {
2651                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2652                 capabilities |= CAP_STATUS32;
2653         }
2654         if (ses->capabilities & CAP_DFS) {
2655                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2656                 capabilities |= CAP_DFS;
2657         }
2658         pSMB->req.Capabilities = cpu_to_le32(capabilities);
2659
2660         bcc_ptr = (char *) &pSMB->req.SecurityBlob;
2661         SecurityBlob = (PNEGOTIATE_MESSAGE) bcc_ptr;
2662         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
2663         SecurityBlob->MessageType = NtLmNegotiate;
2664         negotiate_flags =
2665             NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_OEM |
2666             NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_NTLM |
2667             NTLMSSP_NEGOTIATE_56 |
2668             /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN | */ NTLMSSP_NEGOTIATE_128;
2669         if (sign_CIFS_PDUs)
2670                 negotiate_flags |= NTLMSSP_NEGOTIATE_SIGN;
2671 /*      if (ntlmv2_support)
2672                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;*/
2673         /* setup pointers to domain name and workstation name */
2674         bcc_ptr += SecurityBlobLength;
2675
2676         SecurityBlob->WorkstationName.Buffer = 0;
2677         SecurityBlob->WorkstationName.Length = 0;
2678         SecurityBlob->WorkstationName.MaximumLength = 0;
2679
2680         /* Domain not sent on first Sesssetup in NTLMSSP, instead it is sent
2681         along with username on auth request (ie the response to challenge) */
2682         SecurityBlob->DomainName.Buffer = 0;
2683         SecurityBlob->DomainName.Length = 0;
2684         SecurityBlob->DomainName.MaximumLength = 0;
2685         if (ses->capabilities & CAP_UNICODE) {
2686                 if ((long) bcc_ptr % 2) {
2687                         *bcc_ptr = 0;
2688                         bcc_ptr++;
2689                 }
2690
2691                 bytes_returned =
2692                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
2693                                   32, nls_codepage);
2694                 bcc_ptr += 2 * bytes_returned;
2695                 bytes_returned =
2696                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
2697                                   nls_codepage);
2698                 bcc_ptr += 2 * bytes_returned;
2699                 bcc_ptr += 2;   /* null terminate Linux version */
2700                 bytes_returned =
2701                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
2702                                   64, nls_codepage);
2703                 bcc_ptr += 2 * bytes_returned;
2704                 *(bcc_ptr + 1) = 0;
2705                 *(bcc_ptr + 2) = 0;
2706                 bcc_ptr += 2;   /* null terminate network opsys string */
2707                 *(bcc_ptr + 1) = 0;
2708                 *(bcc_ptr + 2) = 0;
2709                 bcc_ptr += 2;   /* null domain */
2710         } else {                /* ASCII */
2711                 strcpy(bcc_ptr, "Linux version ");
2712                 bcc_ptr += strlen("Linux version ");
2713                 strcpy(bcc_ptr, utsname()->release);
2714                 bcc_ptr += strlen(utsname()->release) + 1;
2715                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
2716                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
2717                 bcc_ptr++;      /* empty domain field */
2718                 *bcc_ptr = 0;
2719         }
2720         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
2721         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
2722         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
2723         smb_buffer->smb_buf_length += count;
2724         pSMB->req.ByteCount = cpu_to_le16(count);
2725
2726         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
2727                          &bytes_returned, CIFS_LONG_OP);
2728
2729         if (smb_buffer_response->Status.CifsError ==
2730             cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
2731                 rc = 0;
2732
2733         if (rc) {
2734 /*    rc = map_smb_to_linux_error(smb_buffer_response);  *//* done in SendReceive now */
2735         } else if ((smb_buffer_response->WordCount == 3)
2736                    || (smb_buffer_response->WordCount == 4)) {
2737                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
2738                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
2739
2740                 if (action & GUEST_LOGIN)
2741                         cFYI(1, ("Guest login"));
2742         /* Do we want to set anything in SesInfo struct when guest login? */
2743
2744                 bcc_ptr = pByteArea(smb_buffer_response);
2745         /* response can have either 3 or 4 word count - Samba sends 3 */
2746
2747                 SecurityBlob2 = (PCHALLENGE_MESSAGE) bcc_ptr;
2748                 if (SecurityBlob2->MessageType != NtLmChallenge) {
2749                         cFYI(1, ("Unexpected NTLMSSP message type received %d",
2750                               SecurityBlob2->MessageType));
2751                 } else if (ses) {
2752                         ses->Suid = smb_buffer_response->Uid; /* UID left in le format */
2753                         cFYI(1, ("UID = %d", ses->Suid));
2754                         if ((pSMBr->resp.hdr.WordCount == 3)
2755                             || ((pSMBr->resp.hdr.WordCount == 4)
2756                                 && (blob_len <
2757                                     pSMBr->resp.ByteCount))) {
2758
2759                                 if (pSMBr->resp.hdr.WordCount == 4) {
2760                                         bcc_ptr += blob_len;
2761                                         cFYI(1, ("Security Blob Length %d",
2762                                               blob_len));
2763                                 }
2764
2765                                 cFYI(1, ("NTLMSSP Challenge rcvd"));
2766
2767                                 memcpy(ses->server->cryptKey,
2768                                        SecurityBlob2->Challenge,
2769                                        CIFS_CRYPTO_KEY_SIZE);
2770                                 if (SecurityBlob2->NegotiateFlags &
2771                                         cpu_to_le32(NTLMSSP_NEGOTIATE_NTLMV2))
2772                                         *pNTLMv2_flag = true;
2773
2774                                 if ((SecurityBlob2->NegotiateFlags &
2775                                         cpu_to_le32(NTLMSSP_NEGOTIATE_ALWAYS_SIGN))
2776                                         || (sign_CIFS_PDUs > 1))
2777                                                 ses->server->secMode |=
2778                                                         SECMODE_SIGN_REQUIRED;
2779                                 if ((SecurityBlob2->NegotiateFlags &
2780                                         cpu_to_le32(NTLMSSP_NEGOTIATE_SIGN)) && (sign_CIFS_PDUs))
2781                                                 ses->server->secMode |=
2782                                                         SECMODE_SIGN_ENABLED;
2783
2784                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
2785                                         if ((long) (bcc_ptr) % 2) {
2786                                                 remaining_words =
2787                                                     (BCC(smb_buffer_response)
2788                                                      - 1) / 2;
2789                                          /* Must word align unicode strings */
2790                                                 bcc_ptr++;
2791                                         } else {
2792                                                 remaining_words =
2793                                                     BCC
2794                                                     (smb_buffer_response) / 2;
2795                                         }
2796                                         len =
2797                                             UniStrnlen((wchar_t *) bcc_ptr,
2798                                                        remaining_words - 1);
2799 /* We look for obvious messed up bcc or strings in response so we do not go off
2800    the end since (at least) WIN2K and Windows XP have a major bug in not null
2801    terminating last Unicode string in response  */
2802                                         kfree(ses->serverOS);
2803                                         ses->serverOS =
2804                                             kzalloc(2 * (len + 1), GFP_KERNEL);
2805                                         cifs_strfromUCS_le(ses->serverOS,
2806                                                            (__le16 *)
2807                                                            bcc_ptr, len,
2808                                                            nls_codepage);
2809                                         bcc_ptr += 2 * (len + 1);
2810                                         remaining_words -= len + 1;
2811                                         ses->serverOS[2 * len] = 0;
2812                                         ses->serverOS[1 + (2 * len)] = 0;
2813                                         if (remaining_words > 0) {
2814                                                 len = UniStrnlen((wchar_t *)
2815                                                                  bcc_ptr,
2816                                                                  remaining_words
2817                                                                  - 1);
2818                                                 kfree(ses->serverNOS);
2819                                                 ses->serverNOS =
2820                                                     kzalloc(2 * (len + 1),
2821                                                             GFP_KERNEL);
2822                                                 cifs_strfromUCS_le(ses->
2823                                                                    serverNOS,
2824                                                                    (__le16 *)
2825                                                                    bcc_ptr,
2826                                                                    len,
2827                                                                    nls_codepage);
2828                                                 bcc_ptr += 2 * (len + 1);
2829                                                 ses->serverNOS[2 * len] = 0;
2830                                                 ses->serverNOS[1 +
2831                                                                (2 * len)] = 0;
2832                                                 remaining_words -= len + 1;
2833                                                 if (remaining_words > 0) {
2834                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
2835                                 /* last string not always null terminated
2836                                    (for e.g. for Windows XP & 2000) */
2837                                                         kfree(ses->serverDomain);
2838                                                         ses->serverDomain =
2839                                                             kzalloc(2 *
2840                                                                     (len +
2841                                                                      1),
2842                                                                     GFP_KERNEL);
2843                                                         cifs_strfromUCS_le
2844                                                             (ses->serverDomain,
2845                                                              (__le16 *)bcc_ptr,
2846                                                              len, nls_codepage);
2847                                                         bcc_ptr +=
2848                                                             2 * (len + 1);
2849                                                         ses->serverDomain[2*len]
2850                                                             = 0;
2851                                                         ses->serverDomain
2852                                                                 [1 + (2 * len)]
2853                                                             = 0;
2854                                                 } /* else no more room so create dummy domain string */
2855                                                 else {
2856                                                         kfree(ses->serverDomain);
2857                                                         ses->serverDomain =
2858                                                             kzalloc(2,
2859                                                                     GFP_KERNEL);
2860                                                 }
2861                                         } else {        /* no room so create dummy domain and NOS string */
2862                                                 kfree(ses->serverDomain);
2863                                                 ses->serverDomain =
2864                                                     kzalloc(2, GFP_KERNEL);
2865                                                 kfree(ses->serverNOS);
2866                                                 ses->serverNOS =
2867                                                     kzalloc(2, GFP_KERNEL);
2868                                         }
2869                                 } else {        /* ASCII */
2870                                         len = strnlen(bcc_ptr, 1024);
2871                                         if (((long) bcc_ptr + len) - (long)
2872                                             pByteArea(smb_buffer_response)
2873                                             <= BCC(smb_buffer_response)) {
2874                                                 kfree(ses->serverOS);
2875                                                 ses->serverOS =
2876                                                     kzalloc(len + 1,
2877                                                             GFP_KERNEL);
2878                                                 strncpy(ses->serverOS,
2879                                                         bcc_ptr, len);
2880
2881                                                 bcc_ptr += len;
2882                                                 bcc_ptr[0] = 0; /* null terminate string */
2883                                                 bcc_ptr++;
2884
2885                                                 len = strnlen(bcc_ptr, 1024);
2886                                                 kfree(ses->serverNOS);
2887                                                 ses->serverNOS =
2888                                                     kzalloc(len + 1,
2889                                                             GFP_KERNEL);
2890                                                 strncpy(ses->serverNOS, bcc_ptr, len);
2891                                                 bcc_ptr += len;
2892                                                 bcc_ptr[0] = 0;
2893                                                 bcc_ptr++;
2894
2895                                                 len = strnlen(bcc_ptr, 1024);
2896                                                 kfree(ses->serverDomain);
2897                                                 ses->serverDomain =
2898                                                     kzalloc(len + 1,
2899                                                             GFP_KERNEL);
2900                                                 strncpy(ses->serverDomain,
2901                                                         bcc_ptr, len);
2902                                                 bcc_ptr += len;
2903                                                 bcc_ptr[0] = 0;
2904                                                 bcc_ptr++;
2905                                         } else
2906                                                 cFYI(1,
2907                                                      ("field of length %d "
2908                                                     "extends beyond end of smb",
2909                                                       len));
2910                                 }
2911                         } else {
2912                                 cERROR(1, ("Security Blob Length extends beyond"
2913                                            " end of SMB"));
2914                         }
2915                 } else {
2916                         cERROR(1, ("No session structure passed in."));
2917                 }
2918         } else {
2919                 cERROR(1, ("Invalid Word count %d:",
2920                         smb_buffer_response->WordCount));
2921                 rc = -EIO;
2922         }
2923
2924         cifs_buf_release(smb_buffer);
2925
2926         return rc;
2927 }
2928
2929 static int
2930 CIFSNTLMSSPAuthSessSetup(unsigned int xid, struct cifsSesInfo *ses,
2931                         char *ntlm_session_key, bool ntlmv2_flag,
2932                         const struct nls_table *nls_codepage)
2933 {
2934         struct smb_hdr *smb_buffer;
2935         struct smb_hdr *smb_buffer_response;
2936         SESSION_SETUP_ANDX *pSMB;
2937         SESSION_SETUP_ANDX *pSMBr;
2938         char *bcc_ptr;
2939         char *user;
2940         char *domain;
2941         int rc = 0;
2942         int remaining_words = 0;
2943         int bytes_returned = 0;
2944         int len;
2945         int SecurityBlobLength = sizeof(AUTHENTICATE_MESSAGE);
2946         PAUTHENTICATE_MESSAGE SecurityBlob;
2947         __u32 negotiate_flags, capabilities;
2948         __u16 count;
2949
2950         cFYI(1, ("In NTLMSSPSessSetup (Authenticate)"));
2951         if (ses == NULL)
2952                 return -EINVAL;
2953         user = ses->userName;
2954         domain = ses->domainName;
2955         smb_buffer = cifs_buf_get();
2956         if (smb_buffer == NULL) {
2957                 return -ENOMEM;
2958         }
2959         smb_buffer_response = smb_buffer;
2960         pSMB = (SESSION_SETUP_ANDX *)smb_buffer;
2961         pSMBr = (SESSION_SETUP_ANDX *)smb_buffer_response;
2962
2963         /* send SMBsessionSetup here */
2964         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2965                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2966
2967         smb_buffer->Mid = GetNextMid(ses->server);
2968         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2969         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2970         pSMB->req.AndXCommand = 0xFF;
2971         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2972         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2973
2974         pSMB->req.hdr.Uid = ses->Suid;
2975
2976         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2977                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2978
2979         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2980                         CAP_EXTENDED_SECURITY;
2981         if (ses->capabilities & CAP_UNICODE) {
2982                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2983                 capabilities |= CAP_UNICODE;
2984         }
2985         if (ses->capabilities & CAP_STATUS32) {
2986                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2987                 capabilities |= CAP_STATUS32;
2988         }
2989         if (ses->capabilities & CAP_DFS) {
2990                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2991                 capabilities |= CAP_DFS;
2992         }
2993         pSMB->req.Capabilities = cpu_to_le32(capabilities);
2994
2995         bcc_ptr = (char *)&pSMB->req.SecurityBlob;
2996         SecurityBlob = (PAUTHENTICATE_MESSAGE)bcc_ptr;
2997         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
2998         SecurityBlob->MessageType = NtLmAuthenticate;
2999         bcc_ptr += SecurityBlobLength;
3000         negotiate_flags = NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_REQUEST_TARGET |
3001                         NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_TARGET_INFO |
3002                         0x80000000 | NTLMSSP_NEGOTIATE_128;
3003         if (sign_CIFS_PDUs)
3004                 negotiate_flags |= /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN |*/ NTLMSSP_NEGOTIATE_SIGN;
3005         if (ntlmv2_flag)
3006                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;
3007
3008 /* setup pointers to domain name and workstation name */
3009
3010         SecurityBlob->WorkstationName.Buffer = 0;
3011         SecurityBlob->WorkstationName.Length = 0;
3012         SecurityBlob->WorkstationName.MaximumLength = 0;
3013         SecurityBlob->SessionKey.Length = 0;
3014         SecurityBlob->SessionKey.MaximumLength = 0;
3015         SecurityBlob->SessionKey.Buffer = 0;
3016
3017         SecurityBlob->LmChallengeResponse.Length = 0;
3018         SecurityBlob->LmChallengeResponse.MaximumLength = 0;
3019         SecurityBlob->LmChallengeResponse.Buffer = 0;
3020
3021         SecurityBlob->NtChallengeResponse.Length =
3022             cpu_to_le16(CIFS_SESS_KEY_SIZE);
3023         SecurityBlob->NtChallengeResponse.MaximumLength =
3024             cpu_to_le16(CIFS_SESS_KEY_SIZE);
3025         memcpy(bcc_ptr, ntlm_session_key, CIFS_SESS_KEY_SIZE);
3026         SecurityBlob->NtChallengeResponse.Buffer =
3027             cpu_to_le32(SecurityBlobLength);
3028         SecurityBlobLength += CIFS_SESS_KEY_SIZE;
3029         bcc_ptr += CIFS_SESS_KEY_SIZE;
3030
3031         if (ses->capabilities & CAP_UNICODE) {
3032                 if (domain == NULL) {
3033                         SecurityBlob->DomainName.Buffer = 0;
3034                         SecurityBlob->DomainName.Length = 0;
3035                         SecurityBlob->DomainName.MaximumLength = 0;
3036                 } else {
3037                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, domain, 64,
3038                                           nls_codepage);
3039                         ln *= 2;
3040                         SecurityBlob->DomainName.MaximumLength =
3041                             cpu_to_le16(ln);
3042                         SecurityBlob->DomainName.Buffer =
3043                             cpu_to_le32(SecurityBlobLength);
3044                         bcc_ptr += ln;
3045                         SecurityBlobLength += ln;
3046                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
3047                 }
3048                 if (user == NULL) {
3049                         SecurityBlob->UserName.Buffer = 0;
3050                         SecurityBlob->UserName.Length = 0;
3051                         SecurityBlob->UserName.MaximumLength = 0;
3052                 } else {
3053                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, user, 64,
3054                                           nls_codepage);
3055                         ln *= 2;
3056                         SecurityBlob->UserName.MaximumLength =
3057                             cpu_to_le16(ln);
3058                         SecurityBlob->UserName.Buffer =
3059                             cpu_to_le32(SecurityBlobLength);
3060                         bcc_ptr += ln;
3061                         SecurityBlobLength += ln;
3062                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3063                 }
3064
3065                 /* SecurityBlob->WorkstationName.Length =
3066                  cifs_strtoUCS((__le16 *) bcc_ptr, "AMACHINE",64, nls_codepage);
3067                    SecurityBlob->WorkstationName.Length *= 2;
3068                    SecurityBlob->WorkstationName.MaximumLength =
3069                         cpu_to_le16(SecurityBlob->WorkstationName.Length);
3070                    SecurityBlob->WorkstationName.Buffer =
3071                                  cpu_to_le32(SecurityBlobLength);
3072                    bcc_ptr += SecurityBlob->WorkstationName.Length;
3073                    SecurityBlobLength += SecurityBlob->WorkstationName.Length;
3074                    SecurityBlob->WorkstationName.Length =
3075                         cpu_to_le16(SecurityBlob->WorkstationName.Length);  */
3076
3077                 if ((long) bcc_ptr % 2) {
3078                         *bcc_ptr = 0;
3079                         bcc_ptr++;
3080                 }
3081                 bytes_returned =
3082                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
3083                                   32, nls_codepage);
3084                 bcc_ptr += 2 * bytes_returned;
3085                 bytes_returned =
3086                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
3087                                   nls_codepage);
3088                 bcc_ptr += 2 * bytes_returned;
3089                 bcc_ptr += 2;   /* null term version string */
3090                 bytes_returned =
3091                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
3092                                   64, nls_codepage);
3093                 bcc_ptr += 2 * bytes_returned;
3094                 *(bcc_ptr + 1) = 0;
3095                 *(bcc_ptr + 2) = 0;
3096                 bcc_ptr += 2;   /* null terminate network opsys string */
3097                 *(bcc_ptr + 1) = 0;
3098                 *(bcc_ptr + 2) = 0;
3099                 bcc_ptr += 2;   /* null domain */
3100         } else {                /* ASCII */
3101                 if (domain == NULL) {
3102                         SecurityBlob->DomainName.Buffer = 0;
3103                         SecurityBlob->DomainName.Length = 0;
3104                         SecurityBlob->DomainName.MaximumLength = 0;
3105                 } else {
3106                         __u16 ln;
3107                         negotiate_flags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
3108                         strncpy(bcc_ptr, domain, 63);
3109                         ln = strnlen(domain, 64);
3110                         SecurityBlob->DomainName.MaximumLength =
3111                             cpu_to_le16(ln);
3112                         SecurityBlob->DomainName.Buffer =
3113                             cpu_to_le32(SecurityBlobLength);
3114                         bcc_ptr += ln;
3115                         SecurityBlobLength += ln;
3116                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
3117                 }
3118                 if (user == NULL) {
3119                         SecurityBlob->UserName.Buffer = 0;
3120                         SecurityBlob->UserName.Length = 0;
3121                         SecurityBlob->UserName.MaximumLength = 0;
3122                 } else {
3123                         __u16 ln;
3124                         strncpy(bcc_ptr, user, 63);
3125                         ln = strnlen(user, 64);
3126                         SecurityBlob->UserName.MaximumLength = cpu_to_le16(ln);
3127                         SecurityBlob->UserName.Buffer =
3128                                                 cpu_to_le32(SecurityBlobLength);
3129                         bcc_ptr += ln;
3130                         SecurityBlobLength += ln;
3131                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3132                 }
3133                 /* BB fill in our workstation name if known BB */
3134
3135                 strcpy(bcc_ptr, "Linux version ");
3136                 bcc_ptr += strlen("Linux version ");
3137                 strcpy(bcc_ptr, utsname()->release);
3138                 bcc_ptr += strlen(utsname()->release) + 1;
3139                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
3140                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
3141                 bcc_ptr++;      /* null domain */
3142                 *bcc_ptr = 0;
3143         }
3144         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
3145         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
3146         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
3147         smb_buffer->smb_buf_length += count;
3148         pSMB->req.ByteCount = cpu_to_le16(count);
3149
3150         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
3151                          &bytes_returned, CIFS_LONG_OP);
3152         if (rc) {
3153 /*   rc = map_smb_to_linux_error(smb_buffer_response) done in SendReceive now */
3154         } else if ((smb_buffer_response->WordCount == 3) ||
3155                    (smb_buffer_response->WordCount == 4)) {
3156                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
3157                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
3158                 if (action & GUEST_LOGIN)
3159                         cFYI(1, ("Guest login")); /* BB Should we set anything
3160                                                          in SesInfo struct ? */
3161 /*              if (SecurityBlob2->MessageType != NtLm??) {
3162                         cFYI("Unexpected message type on auth response is %d"));
3163                 } */
3164
3165                 if (ses) {
3166                         cFYI(1,
3167                              ("Check challenge UID %d vs auth response UID %d",
3168                               ses->Suid, smb_buffer_response->Uid));
3169                         /* UID left in wire format */
3170                         ses->Suid = smb_buffer_response->Uid;
3171                         bcc_ptr = pByteArea(smb_buffer_response);
3172                 /* response can have either 3 or 4 word count - Samba sends 3 */
3173                         if ((pSMBr->resp.hdr.WordCount == 3)
3174                             || ((pSMBr->resp.hdr.WordCount == 4)
3175                                 && (blob_len <
3176                                     pSMBr->resp.ByteCount))) {
3177                                 if (pSMBr->resp.hdr.WordCount == 4) {
3178                                         bcc_ptr +=
3179                                             blob_len;
3180                                         cFYI(1,
3181                                              ("Security Blob Length %d ",
3182                                               blob_len));
3183                                 }
3184
3185                                 cFYI(1,
3186                                      ("NTLMSSP response to Authenticate "));
3187
3188                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
3189                                         if ((long) (bcc_ptr) % 2) {
3190                                                 remaining_words =
3191                                                     (BCC(smb_buffer_response)
3192                                                      - 1) / 2;
3193                                                 bcc_ptr++;      /* Unicode strings must be word aligned */
3194                                         } else {
3195                                                 remaining_words = BCC(smb_buffer_response) / 2;
3196                                         }
3197                                         len = UniStrnlen((wchar_t *) bcc_ptr,
3198                                                         remaining_words - 1);
3199 /* We look for obvious messed up bcc or strings in response so we do not go off
3200   the end since (at least) WIN2K and Windows XP have a major bug in not null
3201   terminating last Unicode string in response  */
3202                                         kfree(ses->serverOS);
3203                                         ses->serverOS =
3204                                             kzalloc(2 * (len + 1), GFP_KERNEL);
3205                                         cifs_strfromUCS_le(ses->serverOS,
3206                                                            (__le16 *)
3207                                                            bcc_ptr, len,
3208                                                            nls_codepage);
3209                                         bcc_ptr += 2 * (len + 1);
3210                                         remaining_words -= len + 1;
3211                                         ses->serverOS[2 * len] = 0;
3212                                         ses->serverOS[1 + (2 * len)] = 0;
3213                                         if (remaining_words > 0) {
3214                                                 len = UniStrnlen((wchar_t *)
3215                                                                  bcc_ptr,
3216                                                                  remaining_words
3217                                                                  - 1);
3218                                                 kfree(ses->serverNOS);
3219                                                 ses->serverNOS =
3220                                                     kzalloc(2 * (len + 1),
3221                                                             GFP_KERNEL);
3222                                                 cifs_strfromUCS_le(ses->
3223                                                                    serverNOS,
3224                                                                    (__le16 *)
3225                                                                    bcc_ptr,
3226                                                                    len,
3227                                                                    nls_codepage);
3228                                                 bcc_ptr += 2 * (len + 1);
3229                                                 ses->serverNOS[2 * len] = 0;
3230                                                 ses->serverNOS[1+(2*len)] = 0;
3231                                                 remaining_words -= len + 1;
3232                                                 if (remaining_words > 0) {
3233                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
3234      /* last string not always null terminated (e.g. for Windows XP & 2000) */
3235                                                         kfree(ses->serverDomain);
3236                                                         ses->serverDomain =
3237                                                             kzalloc(2 *
3238                                                                     (len +
3239                                                                      1),
3240                                                                     GFP_KERNEL);
3241                                                         cifs_strfromUCS_le
3242                                                             (ses->
3243                                                              serverDomain,
3244                                                              (__le16 *)
3245                                                              bcc_ptr, len,
3246                                                              nls_codepage);
3247                                                         bcc_ptr +=
3248                                                             2 * (len + 1);
3249                                                         ses->
3250                                                             serverDomain[2
3251                                                                          * len]
3252                                                             = 0;
3253                                                         ses->
3254                                                             serverDomain[1
3255                                                                          +
3256                                                                          (2
3257                                                                           *
3258                                                                           len)]
3259                                                             = 0;
3260                                                 } /* else no more room so create dummy domain string */
3261                                                 else {
3262                                                         kfree(ses->serverDomain);
3263                                                         ses->serverDomain = kzalloc(2,GFP_KERNEL);
3264                                                 }
3265                                         } else {  /* no room so create dummy domain and NOS string */
3266                                                 kfree(ses->serverDomain);
3267                                                 ses->serverDomain = kzalloc(2, GFP_KERNEL);
3268                                                 kfree(ses->serverNOS);
3269                                                 ses->serverNOS = kzalloc(2, GFP_KERNEL);
3270                                         }
3271                                 } else {        /* ASCII */
3272                                         len = strnlen(bcc_ptr, 1024);
3273                                         if (((long) bcc_ptr + len) -
3274                                            (long) pByteArea(smb_buffer_response)
3275                                                 <= BCC(smb_buffer_response)) {
3276                                                 kfree(ses->serverOS);
3277                                                 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
3278                                                 strncpy(ses->serverOS,bcc_ptr, len);
3279
3280                                                 bcc_ptr += len;
3281                                                 bcc_ptr[0] = 0; /* null terminate the string */
3282                                                 bcc_ptr++;
3283
3284                                                 len = strnlen(bcc_ptr, 1024);
3285                                                 kfree(ses->serverNOS);
3286                                                 ses->serverNOS = kzalloc(len+1,
3287                                                                     GFP_KERNEL);
3288                                                 strncpy(ses->serverNOS,
3289                                                         bcc_ptr, len);
3290                                                 bcc_ptr += len;
3291                                                 bcc_ptr[0] = 0;
3292                                                 bcc_ptr++;
3293
3294                                                 len = strnlen(bcc_ptr, 1024);
3295                                                 kfree(ses->serverDomain);
3296                                                 ses->serverDomain =
3297                                                                 kzalloc(len+1,
3298                                                                     GFP_KERNEL);
3299                                                 strncpy(ses->serverDomain,
3300                                                         bcc_ptr, len);
3301                                                 bcc_ptr += len;
3302                                                 bcc_ptr[0] = 0;
3303                                                 bcc_ptr++;
3304                                         } else
3305                                                 cFYI(1, ("field of length %d "
3306                                                    "extends beyond end of smb ",
3307                                                       len));
3308                                 }
3309                         } else {
3310                                 cERROR(1, ("Security Blob extends beyond end "
3311                                         "of SMB"));
3312                         }
3313                 } else {
3314                         cERROR(1, ("No session structure passed in."));
3315                 }
3316         } else {
3317                 cERROR(1, ("Invalid Word count %d: ",
3318                         smb_buffer_response->WordCount));
3319                 rc = -EIO;
3320         }
3321
3322         cifs_buf_release(smb_buffer);
3323
3324         return rc;
3325 }
3326
3327 int
3328 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
3329          const char *tree, struct cifsTconInfo *tcon,
3330          const struct nls_table *nls_codepage)
3331 {
3332         struct smb_hdr *smb_buffer;
3333         struct smb_hdr *smb_buffer_response;
3334         TCONX_REQ *pSMB;
3335         TCONX_RSP *pSMBr;
3336         unsigned char *bcc_ptr;
3337         int rc = 0;
3338         int length, bytes_left;
3339         __u16 count;
3340
3341         if (ses == NULL)
3342                 return -EIO;
3343
3344         smb_buffer = cifs_buf_get();
3345         if (smb_buffer == NULL) {
3346                 return -ENOMEM;
3347         }
3348         smb_buffer_response = smb_buffer;
3349
3350         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3351                         NULL /*no tid */ , 4 /*wct */ );
3352
3353         smb_buffer->Mid = GetNextMid(ses->server);
3354         smb_buffer->Uid = ses->Suid;
3355         pSMB = (TCONX_REQ *) smb_buffer;
3356         pSMBr = (TCONX_RSP *) smb_buffer_response;
3357
3358         pSMB->AndXCommand = 0xFF;
3359         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3360         bcc_ptr = &pSMB->Password[0];
3361         if ((ses->server->secMode) & SECMODE_USER) {
3362                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
3363                 *bcc_ptr = 0; /* password is null byte */
3364                 bcc_ptr++;              /* skip password */
3365                 /* already aligned so no need to do it below */
3366         } else {
3367                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
3368                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3369                    specified as required (when that support is added to
3370                    the vfs in the future) as only NTLM or the much
3371                    weaker LANMAN (which we do not send by default) is accepted
3372                    by Samba (not sure whether other servers allow
3373                    NTLMv2 password here) */
3374 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3375                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
3376                     (ses->server->secType == LANMAN))
3377                         calc_lanman_hash(tcon->password, ses->server->cryptKey,
3378                                          ses->server->secMode &
3379                                             SECMODE_PW_ENCRYPT ? true : false,
3380                                          bcc_ptr);
3381                 else
3382 #endif /* CIFS_WEAK_PW_HASH */
3383                 SMBNTencrypt(tcon->password, ses->server->cryptKey,
3384                              bcc_ptr);
3385
3386                 bcc_ptr += CIFS_SESS_KEY_SIZE;
3387                 if (ses->capabilities & CAP_UNICODE) {
3388                         /* must align unicode strings */
3389                         *bcc_ptr = 0; /* null byte password */
3390                         bcc_ptr++;
3391                 }
3392         }
3393
3394         if (ses->server->secMode &
3395                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3396                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3397
3398         if (ses->capabilities & CAP_STATUS32) {
3399                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3400         }
3401         if (ses->capabilities & CAP_DFS) {
3402                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3403         }
3404         if (ses->capabilities & CAP_UNICODE) {
3405                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3406                 length =
3407                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3408                         6 /* max utf8 char length in bytes */ *
3409                         (/* server len*/ + 256 /* share len */), nls_codepage);
3410                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3411                 bcc_ptr += 2;   /* skip trailing null */
3412         } else {                /* ASCII */
3413                 strcpy(bcc_ptr, tree);
3414                 bcc_ptr += strlen(tree) + 1;
3415         }
3416         strcpy(bcc_ptr, "?????");
3417         bcc_ptr += strlen("?????");
3418         bcc_ptr += 1;
3419         count = bcc_ptr - &pSMB->Password[0];
3420         pSMB->hdr.smb_buf_length += count;
3421         pSMB->ByteCount = cpu_to_le16(count);
3422
3423         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3424                          CIFS_STD_OP);
3425
3426         /* above now done in SendReceive */
3427         if ((rc == 0) && (tcon != NULL)) {
3428                 tcon->tidStatus = CifsGood;
3429                 tcon->need_reconnect = false;
3430                 tcon->tid = smb_buffer_response->Tid;
3431                 bcc_ptr = pByteArea(smb_buffer_response);
3432                 bytes_left = BCC(smb_buffer_response);
3433                 length = strnlen(bcc_ptr, bytes_left - 2);
3434
3435                 /* skip service field (NB: this field is always ASCII) */
3436                 if (length == 3) {
3437                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3438                             (bcc_ptr[2] == 'C')) {
3439                                 cFYI(1, ("IPC connection"));
3440                                 tcon->ipc = 1;
3441                         }
3442                 } else if (length == 2) {
3443                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3444                                 /* the most common case */
3445                                 cFYI(1, ("disk share connection"));
3446                         }
3447                 }
3448                 bcc_ptr += length + 1;
3449                 bytes_left -= (length + 1);
3450                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3451
3452                 /* mostly informational -- no need to fail on error here */
3453                 tcon->nativeFileSystem = cifs_strndup(bcc_ptr, bytes_left,
3454                                                       smb_buffer->Flags2 &
3455                                                          SMBFLG2_UNICODE,
3456                                                       nls_codepage);
3457
3458                 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
3459
3460                 if ((smb_buffer_response->WordCount == 3) ||
3461                          (smb_buffer_response->WordCount == 7))
3462                         /* field is in same location */
3463                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3464                 else
3465                         tcon->Flags = 0;
3466                 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
3467         } else if ((rc == 0) && tcon == NULL) {
3468                 /* all we need to save for IPC$ connection */
3469                 ses->ipc_tid = smb_buffer_response->Tid;
3470         }
3471
3472         cifs_buf_release(smb_buffer);
3473         return rc;
3474 }
3475
3476 int
3477 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3478 {
3479         int rc = 0;
3480         char *tmp;
3481
3482         if (cifs_sb->tcon)
3483                 cifs_put_tcon(cifs_sb->tcon);
3484
3485         cifs_sb->tcon = NULL;
3486         tmp = cifs_sb->prepath;
3487         cifs_sb->prepathlen = 0;
3488         cifs_sb->prepath = NULL;
3489         kfree(tmp);
3490
3491         return rc;
3492 }
3493
3494 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
3495                                            struct nls_table *nls_info)
3496 {
3497         int rc = 0;
3498         char ntlm_session_key[CIFS_SESS_KEY_SIZE];
3499         bool ntlmv2_flag = false;
3500         int first_time = 0;
3501         struct TCP_Server_Info *server = pSesInfo->server;
3502
3503         /* what if server changes its buffer size after dropping the session? */
3504         if (server->maxBuf == 0) /* no need to send on reconnect */ {
3505                 rc = CIFSSMBNegotiate(xid, pSesInfo);
3506                 if (rc == -EAGAIN) {
3507                         /* retry only once on 1st time connection */
3508                         rc = CIFSSMBNegotiate(xid, pSesInfo);
3509                         if (rc == -EAGAIN)
3510                                 rc = -EHOSTDOWN;
3511                 }
3512                 if (rc == 0) {
3513                         spin_lock(&GlobalMid_Lock);
3514                         if (server->tcpStatus != CifsExiting)
3515                                 server->tcpStatus = CifsGood;
3516                         else
3517                                 rc = -EHOSTDOWN;
3518                         spin_unlock(&GlobalMid_Lock);
3519
3520                 }
3521                 first_time = 1;
3522         }
3523
3524         if (rc)
3525                 goto ss_err_exit;
3526
3527         pSesInfo->flags = 0;
3528         pSesInfo->capabilities = server->capabilities;
3529         if (linuxExtEnabled == 0)
3530                 pSesInfo->capabilities &= (~CAP_UNIX);
3531
3532         cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3533                  server->secMode, server->capabilities, server->timeAdj));
3534
3535         rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
3536         if (rc) {
3537                 cERROR(1, ("Send error in SessSetup = %d", rc));
3538         } else {
3539                 cFYI(1, ("CIFS Session Established successfully"));
3540                 spin_lock(&GlobalMid_Lock);
3541                 pSesInfo->status = CifsGood;
3542                 pSesInfo->need_reconnect = false;
3543                 spin_unlock(&GlobalMid_Lock);
3544         }
3545
3546 ss_err_exit:
3547         return rc;
3548 }
3549