Pileus Git - ~andy/linux/blob - fs/cifs/connect.c

   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2009
   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 <linux/namei.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/processor.h>
  38 #include <linux/inet.h>
  39 #include <net/ipv6.h>
  40 #include "cifspdu.h"
  41 #include "cifsglob.h"
  42 #include "cifsproto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "cifs_fs_sb.h"
  46 #include "ntlmssp.h"
  47 #include "nterr.h"
  48 #include "rfc1002pdu.h"
  49 #include "cn_cifs.h"
  50
  51 #define CIFS_PORT 445
  52 #define RFC1001_PORT 139
  53
  54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  55                          unsigned char *p24);
  56
  57 extern mempool_t *cifs_req_poolp;
  58
  59 struct smb_vol {
  60         char *username;
  61         char *password;
  62         char *domainname;
  63         char *UNC;
  64         char *UNCip;
  65         char *iocharset;  /* local code page for mapping to and from Unicode */
  66         char source_rfc1001_name[16]; /* netbios name of client */
  67         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  68         uid_t linux_uid;
  69         gid_t linux_gid;
  70         mode_t file_mode;
  71         mode_t dir_mode;
  72         unsigned secFlg;
  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
 830         /* default to only allowing write access to owner of the mount */
 831         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 832
 833         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 834         /* default is always to request posix paths. */
 835         vol->posix_paths = 1;
 836         /* default to using server inode numbers where available */
 837         vol->server_ino = 1;
 838
 839         if (!options)
 840                 return 1;
 841
 842         if (strncmp(options, "sep=", 4) == 0) {
 843                 if (options[4] != 0) {
 844                         separator[0] = options[4];
 845                         options += 5;
 846                 } else {
 847                         cFYI(1, ("Null separator not allowed"));
 848                 }
 849         }
 850
 851         while ((data = strsep(&options, separator)) != NULL) {
 852                 if (!*data)
 853                         continue;
 854                 if ((value = strchr(data, '=')) != NULL)
 855                         *value++ = '\0';
 856
 857                 /* Have to parse this before we parse for "user" */
 858                 if (strnicmp(data, "user_xattr", 10) == 0) {
 859                         vol->no_xattr = 0;
 860                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 861                         vol->no_xattr = 1;
 862                 } else if (strnicmp(data, "user", 4) == 0) {
 863                         if (!value) {
 864                                 printk(KERN_WARNING
 865                                        "CIFS: invalid or missing username\n");
 866                                 return 1;       /* needs_arg; */
 867                         } else if (!*value) {
 868                                 /* null user, ie anonymous, authentication */
 869                                 vol->nullauth = 1;
 870                         }
 871                         if (strnlen(value, 200) < 200) {
 872                                 vol->username = value;
 873                         } else {
 874                                 printk(KERN_WARNING "CIFS: username too long\n");
 875                                 return 1;
 876                         }
 877                 } else if (strnicmp(data, "pass", 4) == 0) {
 878                         if (!value) {
 879                                 vol->password = NULL;
 880                                 continue;
 881                         } else if (value[0] == 0) {
 882                                 /* check if string begins with double comma
 883                                    since that would mean the password really
 884                                    does start with a comma, and would not
 885                                    indicate an empty string */
 886                                 if (value[1] != separator[0]) {
 887                                         vol->password = NULL;
 888                                         continue;
 889                                 }
 890                         }
 891                         temp_len = strlen(value);
 892                         /* removed password length check, NTLM passwords
 893                                 can be arbitrarily long */
 894
 895                         /* if comma in password, the string will be
 896                         prematurely null terminated.  Commas in password are
 897                         specified across the cifs mount interface by a double
 898                         comma ie ,, and a comma used as in other cases ie ','
 899                         as a parameter delimiter/separator is single and due
 900                         to the strsep above is temporarily zeroed. */
 901
 902                         /* NB: password legally can have multiple commas and
 903                         the only illegal character in a password is null */
 904
 905                         if ((value[temp_len] == 0) &&
 906                             (value[temp_len+1] == separator[0])) {
 907                                 /* reinsert comma */
 908                                 value[temp_len] = separator[0];
 909                                 temp_len += 2;  /* move after second comma */
 910                                 while (value[temp_len] != 0)  {
 911                                         if (value[temp_len] == separator[0]) {
 912                                                 if (value[temp_len+1] ==
 913                                                      separator[0]) {
 914                                                 /* skip second comma */
 915                                                         temp_len++;
 916                                                 } else {
 917                                                 /* single comma indicating start
 918                                                          of next parm */
 919                                                         break;
 920                                                 }
 921                                         }
 922                                         temp_len++;
 923                                 }
 924                                 if (value[temp_len] == 0) {
 925                                         options = NULL;
 926                                 } else {
 927                                         value[temp_len] = 0;
 928                                         /* point option to start of next parm */
 929                                         options = value + temp_len + 1;
 930                                 }
 931                                 /* go from value to value + temp_len condensing
 932                                 double commas to singles. Note that this ends up
 933                                 allocating a few bytes too many, which is ok */
 934                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 935                                 if (vol->password == NULL) {
 936                                         printk(KERN_WARNING "CIFS: no memory "
 937                                                             "for password\n");
 938                                         return 1;
 939                                 }
 940                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 941                                         vol->password[j] = value[i];
 942                                         if (value[i] == separator[0]
 943                                                 && value[i+1] == separator[0]) {
 944                                                 /* skip second comma */
 945                                                 i++;
 946                                         }
 947                                 }
 948                                 vol->password[j] = 0;
 949                         } else {
 950                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 951                                 if (vol->password == NULL) {
 952                                         printk(KERN_WARNING "CIFS: no memory "
 953                                                             "for password\n");
 954                                         return 1;
 955                                 }
 956                                 strcpy(vol->password, value);
 957                         }
 958                 } else if (!strnicmp(data, "ip", 2) ||
 959                            !strnicmp(data, "addr", 4)) {
 960                         if (!value || !*value) {
 961                                 vol->UNCip = NULL;
 962                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 963                                                         INET6_ADDRSTRLEN) {
 964                                 vol->UNCip = value;
 965                         } else {
 966                                 printk(KERN_WARNING "CIFS: ip address "
 967                                                     "too long\n");
 968                                 return 1;
 969                         }
 970                 } else if (strnicmp(data, "sec", 3) == 0) {
 971                         if (!value || !*value) {
 972                                 cERROR(1, ("no security value specified"));
 973                                 continue;
 974                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 975                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 976                                         CIFSSEC_MUST_SIGN;
 977                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 978                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 979                                         CIFSSEC_MAY_KRB5; */
 980                                 cERROR(1, ("Krb5 cifs privacy not supported"));
 981                                 return 1;
 982                         } else if (strnicmp(value, "krb5", 4) == 0) {
 983                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 984 #ifdef CONFIG_CIFS_EXPERIMENTAL
 985                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 986                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 987                                         CIFSSEC_MUST_SIGN;
 988                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 989                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 990 #endif
 991                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 992                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 993                                         CIFSSEC_MUST_SIGN;
 994                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 995                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 996                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
 997                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
 998                                         CIFSSEC_MUST_SIGN;
 999                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1000                                 /* ntlm is default so can be turned off too */
1001                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1002                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1003                                 /* BB is there a better way to do this? */
1004                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1005 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1006                         } else if (strnicmp(value, "lanman", 6) == 0) {
1007                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1008 #endif
1009                         } else if (strnicmp(value, "none", 4) == 0) {
1010                                 vol->nullauth = 1;
1011                         } else {
1012                                 cERROR(1, ("bad security option: %s", value));
1013                                 return 1;
1014                         }
1015                 } else if ((strnicmp(data, "unc", 3) == 0)
1016                            || (strnicmp(data, "target", 6) == 0)
1017                            || (strnicmp(data, "path", 4) == 0)) {
1018                         if (!value || !*value) {
1019                                 printk(KERN_WARNING "CIFS: invalid path to "
1020                                                     "network resource\n");
1021                                 return 1;       /* needs_arg; */
1022                         }
1023                         if ((temp_len = strnlen(value, 300)) < 300) {
1024                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1025                                 if (vol->UNC == NULL)
1026                                         return 1;
1027                                 strcpy(vol->UNC, value);
1028                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1029                                         vol->UNC[0] = '\\';
1030                                         vol->UNC[1] = '\\';
1031                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1032                                         printk(KERN_WARNING
1033                                                "CIFS: UNC Path does not begin "
1034                                                "with // or \\\\ \n");
1035                                         return 1;
1036                                 }
1037                         } else {
1038                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1039                                 return 1;
1040                         }
1041                 } else if ((strnicmp(data, "domain", 3) == 0)
1042                            || (strnicmp(data, "workgroup", 5) == 0)) {
1043                         if (!value || !*value) {
1044                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1045                                 return 1;       /* needs_arg; */
1046                         }
1047                         /* BB are there cases in which a comma can be valid in
1048                         a domain name and need special handling? */
1049                         if (strnlen(value, 256) < 256) {
1050                                 vol->domainname = value;
1051                                 cFYI(1, ("Domain name set"));
1052                         } else {
1053                                 printk(KERN_WARNING "CIFS: domain name too "
1054                                                     "long\n");
1055                                 return 1;
1056                         }
1057                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1058                         if (!value || !*value) {
1059                                 printk(KERN_WARNING
1060                                         "CIFS: invalid path prefix\n");
1061                                 return 1;       /* needs_argument */
1062                         }
1063                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1064                                 if (value[0] != '/')
1065                                         temp_len++;  /* missing leading slash */
1066                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1067                                 if (vol->prepath == NULL)
1068                                         return 1;
1069                                 if (value[0] != '/') {
1070                                         vol->prepath[0] = '/';
1071                                         strcpy(vol->prepath+1, value);
1072                                 } else
1073                                         strcpy(vol->prepath, value);
1074                                 cFYI(1, ("prefix path %s", vol->prepath));
1075                         } else {
1076                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1077                                 return 1;
1078                         }
1079                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1080                         if (!value || !*value) {
1081                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1082                                                     "specified\n");
1083                                 return 1;       /* needs_arg; */
1084                         }
1085                         if (strnlen(value, 65) < 65) {
1086                                 if (strnicmp(value, "default", 7))
1087                                         vol->iocharset = value;
1088                                 /* if iocharset not set then load_nls_default
1089                                    is used by caller */
1090                                 cFYI(1, ("iocharset set to %s", value));
1091                         } else {
1092                                 printk(KERN_WARNING "CIFS: iocharset name "
1093                                                     "too long.\n");
1094                                 return 1;
1095                         }
1096                 } else if (strnicmp(data, "uid", 3) == 0) {
1097                         if (value && *value)
1098                                 vol->linux_uid =
1099                                         simple_strtoul(value, &value, 0);
1100                 } else if (strnicmp(data, "forceuid", 8) == 0) {
1101                                 vol->override_uid = 1;
1102                 } else if (strnicmp(data, "gid", 3) == 0) {
1103                         if (value && *value)
1104                                 vol->linux_gid =
1105                                         simple_strtoul(value, &value, 0);
1106                 } else if (strnicmp(data, "forcegid", 8) == 0) {
1107                                 vol->override_gid = 1;
1108                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1109                         if (value && *value) {
1110                                 vol->file_mode =
1111                                         simple_strtoul(value, &value, 0);
1112                         }
1113                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1114                         if (value && *value) {
1115                                 vol->dir_mode =
1116                                         simple_strtoul(value, &value, 0);
1117                         }
1118                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1119                         if (value && *value) {
1120                                 vol->dir_mode =
1121                                         simple_strtoul(value, &value, 0);
1122                         }
1123                 } else if (strnicmp(data, "port", 4) == 0) {
1124                         if (value && *value) {
1125                                 vol->port =
1126                                         simple_strtoul(value, &value, 0);
1127                         }
1128                 } else if (strnicmp(data, "rsize", 5) == 0) {
1129                         if (value && *value) {
1130                                 vol->rsize =
1131                                         simple_strtoul(value, &value, 0);
1132                         }
1133                 } else if (strnicmp(data, "wsize", 5) == 0) {
1134                         if (value && *value) {
1135                                 vol->wsize =
1136                                         simple_strtoul(value, &value, 0);
1137                         }
1138                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1139                         if (value && *value) {
1140                                 vol->sockopt =
1141                                         simple_strtoul(value, &value, 0);
1142                         }
1143                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1144                         if (!value || !*value || (*value == ' ')) {
1145                                 cFYI(1, ("invalid (empty) netbiosname"));
1146                         } else {
1147                                 memset(vol->source_rfc1001_name, 0x20, 15);
1148                                 for (i = 0; i < 15; i++) {
1149                                 /* BB are there cases in which a comma can be
1150                                 valid in this workstation netbios name (and need
1151                                 special handling)? */
1152
1153                                 /* We do not uppercase netbiosname for user */
1154                                         if (value[i] == 0)
1155                                                 break;
1156                                         else
1157                                                 vol->source_rfc1001_name[i] =
1158                                                                 value[i];
1159                                 }
1160                                 /* The string has 16th byte zero still from
1161                                 set at top of the function  */
1162                                 if ((i == 15) && (value[i] != 0))
1163                                         printk(KERN_WARNING "CIFS: netbiosname"
1164                                                 " longer than 15 truncated.\n");
1165                         }
1166                 } else if (strnicmp(data, "servern", 7) == 0) {
1167                         /* servernetbiosname specified override *SMBSERVER */
1168                         if (!value || !*value || (*value == ' ')) {
1169                                 cFYI(1, ("empty server netbiosname specified"));
1170                         } else {
1171                                 /* last byte, type, is 0x20 for servr type */
1172                                 memset(vol->target_rfc1001_name, 0x20, 16);
1173
1174                                 for (i = 0; i < 15; i++) {
1175                                 /* BB are there cases in which a comma can be
1176                                    valid in this workstation netbios name
1177                                    (and need special handling)? */
1178
1179                                 /* user or mount helper must uppercase
1180                                    the netbiosname */
1181                                         if (value[i] == 0)
1182                                                 break;
1183                                         else
1184                                                 vol->target_rfc1001_name[i] =
1185                                                                 value[i];
1186                                 }
1187                                 /* The string has 16th byte zero still from
1188                                    set at top of the function  */
1189                                 if ((i == 15) && (value[i] != 0))
1190                                         printk(KERN_WARNING "CIFS: server net"
1191                                         "biosname longer than 15 truncated.\n");
1192                         }
1193                 } else if (strnicmp(data, "credentials", 4) == 0) {
1194                         /* ignore */
1195                 } else if (strnicmp(data, "version", 3) == 0) {
1196                         /* ignore */
1197                 } else if (strnicmp(data, "guest", 5) == 0) {
1198                         /* ignore */
1199                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1200                         vol->noblocksnd = 1;
1201                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1202                         vol->noautotune = 1;
1203                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1204                                    (strnicmp(data, "nosuid", 6) == 0) ||
1205                                    (strnicmp(data, "exec", 4) == 0) ||
1206                                    (strnicmp(data, "noexec", 6) == 0) ||
1207                                    (strnicmp(data, "nodev", 5) == 0) ||
1208                                    (strnicmp(data, "noauto", 6) == 0) ||
1209                                    (strnicmp(data, "dev", 3) == 0)) {
1210                         /*  The mount tool or mount.cifs helper (if present)
1211                             uses these opts to set flags, and the flags are read
1212                             by the kernel vfs layer before we get here (ie
1213                             before read super) so there is no point trying to
1214                             parse these options again and set anything and it
1215                             is ok to just ignore them */
1216                         continue;
1217                 } else if (strnicmp(data, "hard", 4) == 0) {
1218                         vol->retry = 1;
1219                 } else if (strnicmp(data, "soft", 4) == 0) {
1220                         vol->retry = 0;
1221                 } else if (strnicmp(data, "perm", 4) == 0) {
1222                         vol->noperm = 0;
1223                 } else if (strnicmp(data, "noperm", 6) == 0) {
1224                         vol->noperm = 1;
1225                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1226                         vol->remap = 1;
1227                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1228                         vol->remap = 0;
1229                 } else if (strnicmp(data, "sfu", 3) == 0) {
1230                         vol->sfu_emul = 1;
1231                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1232                         vol->sfu_emul = 0;
1233                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1234                         vol->nodfs = 1;
1235                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1236                         vol->posix_paths = 1;
1237                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1238                         vol->posix_paths = 0;
1239                 } else if (strnicmp(data, "nounix", 6) == 0) {
1240                         vol->no_linux_ext = 1;
1241                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1242                         vol->no_linux_ext = 1;
1243                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1244                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1245                         vol->nocase = 1;
1246                 } else if (strnicmp(data, "brl", 3) == 0) {
1247                         vol->nobrl =  0;
1248                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1249                            (strnicmp(data, "nolock", 6) == 0)) {
1250                         vol->nobrl =  1;
1251                         /* turn off mandatory locking in mode
1252                         if remote locking is turned off since the
1253                         local vfs will do advisory */
1254                         if (vol->file_mode ==
1255                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1256                                 vol->file_mode = S_IALLUGO;
1257                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1258                         /* will take the shorter form "forcemand" as well */
1259                         /* This mount option will force use of mandatory
1260                           (DOS/Windows style) byte range locks, instead of
1261                           using posix advisory byte range locks, even if the
1262                           Unix extensions are available and posix locks would
1263                           be supported otherwise. If Unix extensions are not
1264                           negotiated this has no effect since mandatory locks
1265                           would be used (mandatory locks is all that those
1266                           those servers support) */
1267                         vol->mand_lock = 1;
1268                 } else if (strnicmp(data, "setuids", 7) == 0) {
1269                         vol->setuids = 1;
1270                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1271                         vol->setuids = 0;
1272                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1273                         vol->dynperm = true;
1274                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1275                         vol->dynperm = false;
1276                 } else if (strnicmp(data, "nohard", 6) == 0) {
1277                         vol->retry = 0;
1278                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1279                         vol->retry = 1;
1280                 } else if (strnicmp(data, "nointr", 6) == 0) {
1281                         vol->intr = 0;
1282                 } else if (strnicmp(data, "intr", 4) == 0) {
1283                         vol->intr = 1;
1284                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1285                         vol->nostrictsync = 1;
1286                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1287                         vol->nostrictsync = 0;
1288                 } else if (strnicmp(data, "serverino", 7) == 0) {
1289                         vol->server_ino = 1;
1290                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1291                         vol->server_ino = 0;
1292                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1293                         vol->cifs_acl = 1;
1294                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1295                         vol->cifs_acl = 0;
1296                 } else if (strnicmp(data, "acl", 3) == 0) {
1297                         vol->no_psx_acl = 0;
1298                 } else if (strnicmp(data, "noacl", 5) == 0) {
1299                         vol->no_psx_acl = 1;
1300 #ifdef CONFIG_CIFS_EXPERIMENTAL
1301                 } else if (strnicmp(data, "locallease", 6) == 0) {
1302                         vol->local_lease = 1;
1303 #endif
1304                 } else if (strnicmp(data, "sign", 4) == 0) {
1305                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1306                 } else if (strnicmp(data, "seal", 4) == 0) {
1307                         /* we do not do the following in secFlags because seal
1308                            is a per tree connection (mount) not a per socket
1309                            or per-smb connection option in the protocol */
1310                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1311                         vol->seal = 1;
1312                 } else if (strnicmp(data, "direct", 6) == 0) {
1313                         vol->direct_io = 1;
1314                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1315                         vol->direct_io = 1;
1316                 } else if (strnicmp(data, "noac", 4) == 0) {
1317                         printk(KERN_WARNING "CIFS: Mount option noac not "
1318                                 "supported. Instead set "
1319                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1320                 } else
1321                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1322                                                 data);
1323         }
1324         if (vol->UNC == NULL) {
1325                 if (devname == NULL) {
1326                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1327                                                 "target\n");
1328                         return 1;
1329                 }
1330                 if ((temp_len = strnlen(devname, 300)) < 300) {
1331                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1332                         if (vol->UNC == NULL)
1333                                 return 1;
1334                         strcpy(vol->UNC, devname);
1335                         if (strncmp(vol->UNC, "//", 2) == 0) {
1336                                 vol->UNC[0] = '\\';
1337                                 vol->UNC[1] = '\\';
1338                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1339                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1340                                                     "begin with // or \\\\ \n");
1341                                 return 1;
1342                         }
1343                         value = strpbrk(vol->UNC+2, "/\\");
1344                         if (value)
1345                                 *value = '\\';
1346                 } else {
1347                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1348                         return 1;
1349                 }
1350         }
1351         if (vol->UNCip == NULL)
1352                 vol->UNCip = &vol->UNC[2];
1353
1354         return 0;
1355 }
1356
1357 static struct TCP_Server_Info *
1358 cifs_find_tcp_session(struct sockaddr_storage *addr)
1359 {
1360         struct list_head *tmp;
1361         struct TCP_Server_Info *server;
1362         struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1363         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1364
1365         write_lock(&cifs_tcp_ses_lock);
1366         list_for_each(tmp, &cifs_tcp_ses_list) {
1367                 server = list_entry(tmp, struct TCP_Server_Info,
1368                                     tcp_ses_list);
1369                 /*
1370                  * the demux thread can exit on its own while still in CifsNew
1371                  * so don't accept any sockets in that state. Since the
1372                  * tcpStatus never changes back to CifsNew it's safe to check
1373                  * for this without a lock.
1374                  */
1375                 if (server->tcpStatus == CifsNew)
1376                         continue;
1377
1378                 if (addr->ss_family == AF_INET &&
1379                     (addr4->sin_addr.s_addr !=
1380                      server->addr.sockAddr.sin_addr.s_addr))
1381                         continue;
1382                 else if (addr->ss_family == AF_INET6 &&
1383                          (!ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1384                                            &addr6->sin6_addr) ||
1385                           server->addr.sockAddr6.sin6_scope_id !=
1386                                            addr6->sin6_scope_id))
1387                         continue;
1388
1389                 ++server->srv_count;
1390                 write_unlock(&cifs_tcp_ses_lock);
1391                 cFYI(1, ("Existing tcp session with server found"));
1392                 return server;
1393         }
1394         write_unlock(&cifs_tcp_ses_lock);
1395         return NULL;
1396 }
1397
1398 static void
1399 cifs_put_tcp_session(struct TCP_Server_Info *server)
1400 {
1401         struct task_struct *task;
1402
1403         write_lock(&cifs_tcp_ses_lock);
1404         if (--server->srv_count > 0) {
1405                 write_unlock(&cifs_tcp_ses_lock);
1406                 return;
1407         }
1408
1409         list_del_init(&server->tcp_ses_list);
1410         write_unlock(&cifs_tcp_ses_lock);
1411
1412         spin_lock(&GlobalMid_Lock);
1413         server->tcpStatus = CifsExiting;
1414         spin_unlock(&GlobalMid_Lock);
1415
1416         task = xchg(&server->tsk, NULL);
1417         if (task)
1418                 force_sig(SIGKILL, task);
1419 }
1420
1421 static struct TCP_Server_Info *
1422 cifs_get_tcp_session(struct smb_vol *volume_info)
1423 {
1424         struct TCP_Server_Info *tcp_ses = NULL;
1425         struct sockaddr_storage addr;
1426         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1427         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1428         int rc;
1429
1430         memset(&addr, 0, sizeof(struct sockaddr_storage));
1431
1432         cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1433
1434         if (volume_info->UNCip && volume_info->UNC) {
1435                 rc = cifs_convert_address(volume_info->UNCip, &addr);
1436                 if (!rc) {
1437                         /* we failed translating address */
1438                         rc = -EINVAL;
1439                         goto out_err;
1440                 }
1441         } else if (volume_info->UNCip) {
1442                 /* BB using ip addr as tcp_ses name to connect to the
1443                    DFS root below */
1444                 cERROR(1, ("Connecting to DFS root not implemented yet"));
1445                 rc = -EINVAL;
1446                 goto out_err;
1447         } else /* which tcp_sess DFS root would we conect to */ {
1448                 cERROR(1,
1449                        ("CIFS mount error: No UNC path (e.g. -o "
1450                         "unc=//192.168.1.100/public) specified"));
1451                 rc = -EINVAL;
1452                 goto out_err;
1453         }
1454
1455         /* see if we already have a matching tcp_ses */
1456         tcp_ses = cifs_find_tcp_session(&addr);
1457         if (tcp_ses)
1458                 return tcp_ses;
1459
1460         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1461         if (!tcp_ses) {
1462                 rc = -ENOMEM;
1463                 goto out_err;
1464         }
1465
1466         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1467         if (IS_ERR(tcp_ses->hostname)) {
1468                 rc = PTR_ERR(tcp_ses->hostname);
1469                 goto out_err;
1470         }
1471
1472         tcp_ses->noblocksnd = volume_info->noblocksnd;
1473         tcp_ses->noautotune = volume_info->noautotune;
1474         atomic_set(&tcp_ses->inFlight, 0);
1475         init_waitqueue_head(&tcp_ses->response_q);
1476         init_waitqueue_head(&tcp_ses->request_q);
1477         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1478         mutex_init(&tcp_ses->srv_mutex);
1479         memcpy(tcp_ses->workstation_RFC1001_name,
1480                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1481         memcpy(tcp_ses->server_RFC1001_name,
1482                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1483         tcp_ses->sequence_number = 0;
1484         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1485         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1486
1487         /*
1488          * at this point we are the only ones with the pointer
1489          * to the struct since the kernel thread not created yet
1490          * no need to spinlock this init of tcpStatus or srv_count
1491          */
1492         tcp_ses->tcpStatus = CifsNew;
1493         ++tcp_ses->srv_count;
1494
1495         if (addr.ss_family == AF_INET6) {
1496                 cFYI(1, ("attempting ipv6 connect"));
1497                 /* BB should we allow ipv6 on port 139? */
1498                 /* other OS never observed in Wild doing 139 with v6 */
1499                 sin_server6->sin6_port = htons(volume_info->port);
1500                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1501                         sizeof(struct sockaddr_in6));
1502                 rc = ipv6_connect(tcp_ses);
1503         } else {
1504                 sin_server->sin_port = htons(volume_info->port);
1505                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1506                         sizeof(struct sockaddr_in));
1507                 rc = ipv4_connect(tcp_ses);
1508         }
1509         if (rc < 0) {
1510                 cERROR(1, ("Error connecting to socket. Aborting operation"));
1511                 goto out_err;
1512         }
1513
1514         /*
1515          * since we're in a cifs function already, we know that
1516          * this will succeed. No need for try_module_get().
1517          */
1518         __module_get(THIS_MODULE);
1519         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1520                                   tcp_ses, "cifsd");
1521         if (IS_ERR(tcp_ses->tsk)) {
1522                 rc = PTR_ERR(tcp_ses->tsk);
1523                 cERROR(1, ("error %d create cifsd thread", rc));
1524                 module_put(THIS_MODULE);
1525                 goto out_err;
1526         }
1527
1528         /* thread spawned, put it on the list */
1529         write_lock(&cifs_tcp_ses_lock);
1530         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1531         write_unlock(&cifs_tcp_ses_lock);
1532
1533         return tcp_ses;
1534
1535 out_err:
1536         if (tcp_ses) {
1537                 kfree(tcp_ses->hostname);
1538                 if (tcp_ses->ssocket)
1539                         sock_release(tcp_ses->ssocket);
1540                 kfree(tcp_ses);
1541         }
1542         return ERR_PTR(rc);
1543 }
1544
1545 static struct cifsSesInfo *
1546 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1547 {
1548         struct list_head *tmp;
1549         struct cifsSesInfo *ses;
1550
1551         write_lock(&cifs_tcp_ses_lock);
1552         list_for_each(tmp, &server->smb_ses_list) {
1553                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1554                 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1555                         continue;
1556
1557                 ++ses->ses_count;
1558                 write_unlock(&cifs_tcp_ses_lock);
1559                 return ses;
1560         }
1561         write_unlock(&cifs_tcp_ses_lock);
1562         return NULL;
1563 }
1564
1565 static void
1566 cifs_put_smb_ses(struct cifsSesInfo *ses)
1567 {
1568         int xid;
1569         struct TCP_Server_Info *server = ses->server;
1570
1571         write_lock(&cifs_tcp_ses_lock);
1572         if (--ses->ses_count > 0) {
1573                 write_unlock(&cifs_tcp_ses_lock);
1574                 return;
1575         }
1576
1577         list_del_init(&ses->smb_ses_list);
1578         write_unlock(&cifs_tcp_ses_lock);
1579
1580         if (ses->status == CifsGood) {
1581                 xid = GetXid();
1582                 CIFSSMBLogoff(xid, ses);
1583                 _FreeXid(xid);
1584         }
1585         sesInfoFree(ses);
1586         cifs_put_tcp_session(server);
1587 }
1588
1589 static struct cifsTconInfo *
1590 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1591 {
1592         struct list_head *tmp;
1593         struct cifsTconInfo *tcon;
1594
1595         write_lock(&cifs_tcp_ses_lock);
1596         list_for_each(tmp, &ses->tcon_list) {
1597                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1598                 if (tcon->tidStatus == CifsExiting)
1599                         continue;
1600                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1601                         continue;
1602
1603                 ++tcon->tc_count;
1604                 write_unlock(&cifs_tcp_ses_lock);
1605                 return tcon;
1606         }
1607         write_unlock(&cifs_tcp_ses_lock);
1608         return NULL;
1609 }
1610
1611 static void
1612 cifs_put_tcon(struct cifsTconInfo *tcon)
1613 {
1614         int xid;
1615         struct cifsSesInfo *ses = tcon->ses;
1616
1617         write_lock(&cifs_tcp_ses_lock);
1618         if (--tcon->tc_count > 0) {
1619                 write_unlock(&cifs_tcp_ses_lock);
1620                 return;
1621         }
1622
1623         list_del_init(&tcon->tcon_list);
1624         write_unlock(&cifs_tcp_ses_lock);
1625
1626         xid = GetXid();
1627         CIFSSMBTDis(xid, tcon);
1628         _FreeXid(xid);
1629
1630         DeleteTconOplockQEntries(tcon);
1631         tconInfoFree(tcon);
1632         cifs_put_smb_ses(ses);
1633 }
1634
1635 int
1636 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1637              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1638              struct dfs_info3_param **preferrals, int remap)
1639 {
1640         char *temp_unc;
1641         int rc = 0;
1642
1643         *pnum_referrals = 0;
1644         *preferrals = NULL;
1645
1646         if (pSesInfo->ipc_tid == 0) {
1647                 temp_unc = kmalloc(2 /* for slashes */ +
1648                         strnlen(pSesInfo->serverName,
1649                                 SERVER_NAME_LEN_WITH_NULL * 2)
1650                                  + 1 + 4 /* slash IPC$ */  + 2,
1651                                 GFP_KERNEL);
1652                 if (temp_unc == NULL)
1653                         return -ENOMEM;
1654                 temp_unc[0] = '\\';
1655                 temp_unc[1] = '\\';
1656                 strcpy(temp_unc + 2, pSesInfo->serverName);
1657                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1658                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1659                 cFYI(1,
1660                      ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1661                 kfree(temp_unc);
1662         }
1663         if (rc == 0)
1664                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1665                                      pnum_referrals, nls_codepage, remap);
1666         /* BB map targetUNCs to dfs_info3 structures, here or
1667                 in CIFSGetDFSRefer BB */
1668
1669         return rc;
1670 }
1671
1672 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1673 static struct lock_class_key cifs_key[2];
1674 static struct lock_class_key cifs_slock_key[2];
1675
1676 static inline void
1677 cifs_reclassify_socket4(struct socket *sock)
1678 {
1679         struct sock *sk = sock->sk;
1680         BUG_ON(sock_owned_by_user(sk));
1681         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1682                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1683 }
1684
1685 static inline void
1686 cifs_reclassify_socket6(struct socket *sock)
1687 {
1688         struct sock *sk = sock->sk;
1689         BUG_ON(sock_owned_by_user(sk));
1690         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1691                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1692 }
1693 #else
1694 static inline void
1695 cifs_reclassify_socket4(struct socket *sock)
1696 {
1697 }
1698
1699 static inline void
1700 cifs_reclassify_socket6(struct socket *sock)
1701 {
1702 }
1703 #endif
1704
1705 /* See RFC1001 section 14 on representation of Netbios names */
1706 static void rfc1002mangle(char *target, char *source, unsigned int length)
1707 {
1708         unsigned int i, j;
1709
1710         for (i = 0, j = 0; i < (length); i++) {
1711                 /* mask a nibble at a time and encode */
1712                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1713                 target[j+1] = 'A' + (0x0F & source[i]);
1714                 j += 2;
1715         }
1716
1717 }
1718
1719
1720 static int
1721 ipv4_connect(struct TCP_Server_Info *server)
1722 {
1723         int rc = 0;
1724         bool connected = false;
1725         __be16 orig_port = 0;
1726         struct socket *socket = server->ssocket;
1727
1728         if (socket == NULL) {
1729                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1730                                       IPPROTO_TCP, &socket);
1731                 if (rc < 0) {
1732                         cERROR(1, ("Error %d creating socket", rc));
1733                         return rc;
1734                 }
1735
1736                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1737                 cFYI(1, ("Socket created"));
1738                 server->ssocket = socket;
1739                 socket->sk->sk_allocation = GFP_NOFS;
1740                 cifs_reclassify_socket4(socket);
1741         }
1742
1743         /* user overrode default port */
1744         if (server->addr.sockAddr.sin_port) {
1745                 rc = socket->ops->connect(socket, (struct sockaddr *)
1746                                           &server->addr.sockAddr,
1747                                           sizeof(struct sockaddr_in), 0);
1748                 if (rc >= 0)
1749                         connected = true;
1750         }
1751
1752         if (!connected) {
1753                 /* save original port so we can retry user specified port
1754                         later if fall back ports fail this time  */
1755                 orig_port = server->addr.sockAddr.sin_port;
1756
1757                 /* do not retry on the same port we just failed on */
1758                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1759                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1760                         rc = socket->ops->connect(socket,
1761                                                 (struct sockaddr *)
1762                                                 &server->addr.sockAddr,
1763                                                 sizeof(struct sockaddr_in), 0);
1764                         if (rc >= 0)
1765                                 connected = true;
1766                 }
1767         }
1768         if (!connected) {
1769                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1770                 rc = socket->ops->connect(socket, (struct sockaddr *)
1771                                               &server->addr.sockAddr,
1772                                               sizeof(struct sockaddr_in), 0);
1773                 if (rc >= 0)
1774                         connected = true;
1775         }
1776
1777         /* give up here - unless we want to retry on different
1778                 protocol families some day */
1779         if (!connected) {
1780                 if (orig_port)
1781                         server->addr.sockAddr.sin_port = orig_port;
1782                 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1783                 sock_release(socket);
1784                 server->ssocket = NULL;
1785                 return rc;
1786         }
1787
1788
1789         /*
1790          * Eventually check for other socket options to change from
1791          *  the default. sock_setsockopt not used because it expects
1792          *  user space buffer
1793          */
1794         socket->sk->sk_rcvtimeo = 7 * HZ;
1795         socket->sk->sk_sndtimeo = 5 * HZ;
1796
1797         /* make the bufsizes depend on wsize/rsize and max requests */
1798         if (server->noautotune) {
1799                 if (socket->sk->sk_sndbuf < (200 * 1024))
1800                         socket->sk->sk_sndbuf = 200 * 1024;
1801                 if (socket->sk->sk_rcvbuf < (140 * 1024))
1802                         socket->sk->sk_rcvbuf = 140 * 1024;
1803         }
1804
1805          cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1806                  socket->sk->sk_sndbuf,
1807                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1808
1809         /* send RFC1001 sessinit */
1810         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1811                 /* some servers require RFC1001 sessinit before sending
1812                 negprot - BB check reconnection in case where second
1813                 sessinit is sent but no second negprot */
1814                 struct rfc1002_session_packet *ses_init_buf;
1815                 struct smb_hdr *smb_buf;
1816                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1817                                        GFP_KERNEL);
1818                 if (ses_init_buf) {
1819                         ses_init_buf->trailer.session_req.called_len = 32;
1820                         if (server->server_RFC1001_name &&
1821                             server->server_RFC1001_name[0] != 0)
1822                                 rfc1002mangle(ses_init_buf->trailer.
1823                                                 session_req.called_name,
1824                                               server->server_RFC1001_name,
1825                                               RFC1001_NAME_LEN_WITH_NULL);
1826                         else
1827                                 rfc1002mangle(ses_init_buf->trailer.
1828                                                 session_req.called_name,
1829                                               DEFAULT_CIFS_CALLED_NAME,
1830                                               RFC1001_NAME_LEN_WITH_NULL);
1831
1832                         ses_init_buf->trailer.session_req.calling_len = 32;
1833
1834                         /* calling name ends in null (byte 16) from old smb
1835                         convention. */
1836                         if (server->workstation_RFC1001_name &&
1837                             server->workstation_RFC1001_name[0] != 0)
1838                                 rfc1002mangle(ses_init_buf->trailer.
1839                                                 session_req.calling_name,
1840                                               server->workstation_RFC1001_name,
1841                                               RFC1001_NAME_LEN_WITH_NULL);
1842                         else
1843                                 rfc1002mangle(ses_init_buf->trailer.
1844                                                 session_req.calling_name,
1845                                               "LINUX_CIFS_CLNT",
1846                                               RFC1001_NAME_LEN_WITH_NULL);
1847
1848                         ses_init_buf->trailer.session_req.scope1 = 0;
1849                         ses_init_buf->trailer.session_req.scope2 = 0;
1850                         smb_buf = (struct smb_hdr *)ses_init_buf;
1851                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1852                         smb_buf->smb_buf_length = 0x81000044;
1853                         rc = smb_send(server, smb_buf, 0x44);
1854                         kfree(ses_init_buf);
1855                         msleep(1); /* RFC1001 layer in at least one server
1856                                       requires very short break before negprot
1857                                       presumably because not expecting negprot
1858                                       to follow so fast.  This is a simple
1859                                       solution that works without
1860                                       complicating the code and causes no
1861                                       significant slowing down on mount
1862                                       for everyone else */
1863                 }
1864                 /* else the negprot may still work without this
1865                 even though malloc failed */
1866
1867         }
1868
1869         return rc;
1870 }
1871
1872 static int
1873 ipv6_connect(struct TCP_Server_Info *server)
1874 {
1875         int rc = 0;
1876         bool connected = false;
1877         __be16 orig_port = 0;
1878         struct socket *socket = server->ssocket;
1879
1880         if (socket == NULL) {
1881                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1882                                       IPPROTO_TCP, &socket);
1883                 if (rc < 0) {
1884                         cERROR(1, ("Error %d creating ipv6 socket", rc));
1885                         socket = NULL;
1886                         return rc;
1887                 }
1888
1889                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1890                 cFYI(1, ("ipv6 Socket created"));
1891                 server->ssocket = socket;
1892                 socket->sk->sk_allocation = GFP_NOFS;
1893                 cifs_reclassify_socket6(socket);
1894         }
1895
1896         /* user overrode default port */
1897         if (server->addr.sockAddr6.sin6_port) {
1898                 rc = socket->ops->connect(socket,
1899                                 (struct sockaddr *) &server->addr.sockAddr6,
1900                                 sizeof(struct sockaddr_in6), 0);
1901                 if (rc >= 0)
1902                         connected = true;
1903         }
1904
1905         if (!connected) {
1906                 /* save original port so we can retry user specified port
1907                         later if fall back ports fail this time  */
1908
1909                 orig_port = server->addr.sockAddr6.sin6_port;
1910                 /* do not retry on the same port we just failed on */
1911                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1912                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1913                         rc = socket->ops->connect(socket, (struct sockaddr *)
1914                                         &server->addr.sockAddr6,
1915                                         sizeof(struct sockaddr_in6), 0);
1916                         if (rc >= 0)
1917                                 connected = true;
1918                 }
1919         }
1920         if (!connected) {
1921                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1922                 rc = socket->ops->connect(socket, (struct sockaddr *)
1923                                 &server->addr.sockAddr6,
1924                                 sizeof(struct sockaddr_in6), 0);
1925                 if (rc >= 0)
1926                         connected = true;
1927         }
1928
1929         /* give up here - unless we want to retry on different
1930                 protocol families some day */
1931         if (!connected) {
1932                 if (orig_port)
1933                         server->addr.sockAddr6.sin6_port = orig_port;
1934                 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1935                 sock_release(socket);
1936                 server->ssocket = NULL;
1937                 return rc;
1938         }
1939
1940         /*
1941          * Eventually check for other socket options to change from
1942          * the default. sock_setsockopt not used because it expects
1943          * user space buffer
1944          */
1945         socket->sk->sk_rcvtimeo = 7 * HZ;
1946         socket->sk->sk_sndtimeo = 5 * HZ;
1947         server->ssocket = socket;
1948
1949         return rc;
1950 }
1951
1952 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1953                           struct super_block *sb, struct smb_vol *vol_info)
1954 {
1955         /* if we are reconnecting then should we check to see if
1956          * any requested capabilities changed locally e.g. via
1957          * remount but we can not do much about it here
1958          * if they have (even if we could detect it by the following)
1959          * Perhaps we could add a backpointer to array of sb from tcon
1960          * or if we change to make all sb to same share the same
1961          * sb as NFS - then we only have one backpointer to sb.
1962          * What if we wanted to mount the server share twice once with
1963          * and once without posixacls or posix paths? */
1964         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1965
1966         if (vol_info && vol_info->no_linux_ext) {
1967                 tcon->fsUnixInfo.Capability = 0;
1968                 tcon->unix_ext = 0; /* Unix Extensions disabled */
1969                 cFYI(1, ("Linux protocol extensions disabled"));
1970                 return;
1971         } else if (vol_info)
1972                 tcon->unix_ext = 1; /* Unix Extensions supported */
1973
1974         if (tcon->unix_ext == 0) {
1975                 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1976                 return;
1977         }
1978
1979         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1980                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1981
1982                 /* check for reconnect case in which we do not
1983                    want to change the mount behavior if we can avoid it */
1984                 if (vol_info == NULL) {
1985                         /* turn off POSIX ACL and PATHNAMES if not set
1986                            originally at mount time */
1987                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1988                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1989                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1990                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1991                                         cERROR(1, ("POSIXPATH support change"));
1992                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1993                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1994                                 cERROR(1, ("possible reconnect error"));
1995                                 cERROR(1,
1996                                         ("server disabled POSIX path support"));
1997                         }
1998                 }
1999
2000                 cap &= CIFS_UNIX_CAP_MASK;
2001                 if (vol_info && vol_info->no_psx_acl)
2002                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2003                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2004                         cFYI(1, ("negotiated posix acl support"));
2005                         if (sb)
2006                                 sb->s_flags |= MS_POSIXACL;
2007                 }
2008
2009                 if (vol_info && vol_info->posix_paths == 0)
2010                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2011                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2012                         cFYI(1, ("negotiate posix pathnames"));
2013                         if (sb)
2014                                 CIFS_SB(sb)->mnt_cifs_flags |=
2015                                         CIFS_MOUNT_POSIX_PATHS;
2016                 }
2017
2018                 /* We might be setting the path sep back to a different
2019                 form if we are reconnecting and the server switched its
2020                 posix path capability for this share */
2021                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2022                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2023
2024                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2025                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2026                                 CIFS_SB(sb)->rsize = 127 * 1024;
2027                                 cFYI(DBG2,
2028                                         ("larger reads not supported by srv"));
2029                         }
2030                 }
2031
2032
2033                 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2034 #ifdef CONFIG_CIFS_DEBUG2
2035                 if (cap & CIFS_UNIX_FCNTL_CAP)
2036                         cFYI(1, ("FCNTL cap"));
2037                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2038                         cFYI(1, ("EXTATTR cap"));
2039                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2040                         cFYI(1, ("POSIX path cap"));
2041                 if (cap & CIFS_UNIX_XATTR_CAP)
2042                         cFYI(1, ("XATTR cap"));
2043                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2044                         cFYI(1, ("POSIX ACL cap"));
2045                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2046                         cFYI(1, ("very large read cap"));
2047                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2048                         cFYI(1, ("very large write cap"));
2049 #endif /* CIFS_DEBUG2 */
2050                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2051                         if (vol_info == NULL) {
2052                                 cFYI(1, ("resetting capabilities failed"));
2053                         } else
2054                                 cERROR(1, ("Negotiating Unix capabilities "
2055                                            "with the server failed.  Consider "
2056                                            "mounting with the Unix Extensions\n"
2057                                            "disabled, if problems are found, "
2058                                            "by specifying the nounix mount "
2059                                            "option."));
2060
2061                 }
2062         }
2063 }
2064
2065 static void
2066 convert_delimiter(char *path, char delim)
2067 {
2068         int i;
2069         char old_delim;
2070
2071         if (path == NULL)
2072                 return;
2073
2074         if (delim == '/')
2075                 old_delim = '\\';
2076         else
2077                 old_delim = '/';
2078
2079         for (i = 0; path[i] != '\0'; i++) {
2080                 if (path[i] == old_delim)
2081                         path[i] = delim;
2082         }
2083 }
2084
2085 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2086                           struct cifs_sb_info *cifs_sb)
2087 {
2088         if (pvolume_info->rsize > CIFSMaxBufSize) {
2089                 cERROR(1, ("rsize %d too large, using MaxBufSize",
2090                         pvolume_info->rsize));
2091                 cifs_sb->rsize = CIFSMaxBufSize;
2092         } else if ((pvolume_info->rsize) &&
2093                         (pvolume_info->rsize <= CIFSMaxBufSize))
2094                 cifs_sb->rsize = pvolume_info->rsize;
2095         else /* default */
2096                 cifs_sb->rsize = CIFSMaxBufSize;
2097
2098         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2099                 cERROR(1, ("wsize %d too large, using 4096 instead",
2100                           pvolume_info->wsize));
2101                 cifs_sb->wsize = 4096;
2102         } else if (pvolume_info->wsize)
2103                 cifs_sb->wsize = pvolume_info->wsize;
2104         else
2105                 cifs_sb->wsize = min_t(const int,
2106                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2107                                         127*1024);
2108                 /* old default of CIFSMaxBufSize was too small now
2109                    that SMB Write2 can send multiple pages in kvec.
2110                    RFC1001 does not describe what happens when frame
2111                    bigger than 128K is sent so use that as max in
2112                    conjunction with 52K kvec constraint on arch with 4K
2113                    page size  */
2114
2115         if (cifs_sb->rsize < 2048) {
2116                 cifs_sb->rsize = 2048;
2117                 /* Windows ME may prefer this */
2118                 cFYI(1, ("readsize set to minimum: 2048"));
2119         }
2120         /* calculate prepath */
2121         cifs_sb->prepath = pvolume_info->prepath;
2122         if (cifs_sb->prepath) {
2123                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2124                 /* we can not convert the / to \ in the path
2125                 separators in the prefixpath yet because we do not
2126                 know (until reset_cifs_unix_caps is called later)
2127                 whether POSIX PATH CAP is available. We normalize
2128                 the / to \ after reset_cifs_unix_caps is called */
2129                 pvolume_info->prepath = NULL;
2130         } else
2131                 cifs_sb->prepathlen = 0;
2132         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2133         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2134         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2135         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2136         cFYI(1, ("file mode: 0x%x  dir mode: 0x%x",
2137                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2138
2139         if (pvolume_info->noperm)
2140                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2141         if (pvolume_info->setuids)
2142                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2143         if (pvolume_info->server_ino)
2144                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2145         if (pvolume_info->remap)
2146                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2147         if (pvolume_info->no_xattr)
2148                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2149         if (pvolume_info->sfu_emul)
2150                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2151         if (pvolume_info->nobrl)
2152                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2153         if (pvolume_info->nostrictsync)
2154                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2155         if (pvolume_info->mand_lock)
2156                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2157         if (pvolume_info->cifs_acl)
2158                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2159         if (pvolume_info->override_uid)
2160                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2161         if (pvolume_info->override_gid)
2162                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2163         if (pvolume_info->dynperm)
2164                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2165         if (pvolume_info->direct_io) {
2166                 cFYI(1, ("mounting share using direct i/o"));
2167                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2168         }
2169
2170         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2171                 cERROR(1, ("mount option dynperm ignored if cifsacl "
2172                            "mount option supported"));
2173 }
2174
2175 static int
2176 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2177                    struct cifs_sb_info *cifs_sb, const char *full_path)
2178 {
2179         int rc;
2180         __u64 inode_num;
2181         FILE_ALL_INFO *pfile_info;
2182
2183         rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2184                                    cifs_sb->local_nls,
2185                                    cifs_sb->mnt_cifs_flags &
2186                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2187         if (rc != -EOPNOTSUPP)
2188                 return rc;
2189
2190         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2191         if (pfile_info == NULL)
2192                 return -ENOMEM;
2193
2194         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2195                               0 /* not legacy */, cifs_sb->local_nls,
2196                               cifs_sb->mnt_cifs_flags &
2197                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2198         kfree(pfile_info);
2199         return rc;
2200 }
2201
2202 static void
2203 cleanup_volume_info(struct smb_vol **pvolume_info)
2204 {
2205         struct smb_vol *volume_info;
2206
2207         if (!pvolume_info && !*pvolume_info)
2208                 return;
2209
2210         volume_info = *pvolume_info;
2211         kzfree(volume_info->password);
2212         kfree(volume_info->UNC);
2213         kfree(volume_info->prepath);
2214         kfree(volume_info);
2215         *pvolume_info = NULL;
2216         return;
2217 }
2218
2219 #ifdef CONFIG_CIFS_DFS_UPCALL
2220 /* build_path_to_root returns full path to root when
2221  * we do not have an exiting connection (tcon) */
2222 static char *
2223 build_unc_path_to_root(const struct smb_vol *volume_info,
2224                 const struct cifs_sb_info *cifs_sb)
2225 {
2226         char *full_path;
2227
2228         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2229         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2230         if (full_path == NULL)
2231                 return ERR_PTR(-ENOMEM);
2232
2233         strncpy(full_path, volume_info->UNC, unc_len);
2234         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2235                 int i;
2236                 for (i = 0; i < unc_len; i++) {
2237                         if (full_path[i] == '\\')
2238                                 full_path[i] = '/';
2239                 }
2240         }
2241
2242         if (cifs_sb->prepathlen)
2243                 strncpy(full_path + unc_len, cifs_sb->prepath,
2244                                 cifs_sb->prepathlen);
2245
2246         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2247         return full_path;
2248 }
2249 #endif
2250
2251 int
2252 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2253                 char *mount_data_global, const char *devname)
2254 {
2255         int rc = 0;
2256         int xid;
2257         struct smb_vol *volume_info;
2258         struct cifsSesInfo *pSesInfo = NULL;
2259         struct cifsTconInfo *tcon = NULL;
2260         struct TCP_Server_Info *srvTcp = NULL;
2261         char   *full_path;
2262         char *mount_data = mount_data_global;
2263 #ifdef CONFIG_CIFS_DFS_UPCALL
2264         struct dfs_info3_param *referrals = NULL;
2265         unsigned int num_referrals = 0;
2266         int referral_walks_count = 0;
2267 try_mount_again:
2268 #endif
2269         full_path = NULL;
2270
2271         xid = GetXid();
2272
2273         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2274         if (!volume_info) {
2275                 rc = -ENOMEM;
2276                 goto out;
2277         }
2278
2279         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2280                 rc = -EINVAL;
2281                 goto out;
2282         }
2283
2284         if (volume_info->nullauth) {
2285                 cFYI(1, ("null user"));
2286                 volume_info->username = "";
2287         } else if (volume_info->username) {
2288                 /* BB fixme parse for domain name here */
2289                 cFYI(1, ("Username: %s", volume_info->username));
2290         } else {
2291                 cifserror("No username specified");
2292         /* In userspace mount helper we can get user name from alternate
2293            locations such as env variables and files on disk */
2294                 rc = -EINVAL;
2295                 goto out;
2296         }
2297
2298
2299         /* this is needed for ASCII cp to Unicode converts */
2300         if (volume_info->iocharset == NULL) {
2301                 cifs_sb->local_nls = load_nls_default();
2302         /* load_nls_default can not return null */
2303         } else {
2304                 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2305                 if (cifs_sb->local_nls == NULL) {
2306                         cERROR(1, ("CIFS mount error: iocharset %s not found",
2307                                  volume_info->iocharset));
2308                         rc = -ELIBACC;
2309                         goto out;
2310                 }
2311         }
2312
2313         /* get a reference to a tcp session */
2314         srvTcp = cifs_get_tcp_session(volume_info);
2315         if (IS_ERR(srvTcp)) {
2316                 rc = PTR_ERR(srvTcp);
2317                 goto out;
2318         }
2319
2320         pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2321         if (pSesInfo) {
2322                 cFYI(1, ("Existing smb sess found (status=%d)",
2323                         pSesInfo->status));
2324                 /*
2325                  * The existing SMB session already has a reference to srvTcp,
2326                  * so we can put back the extra one we got before
2327                  */
2328                 cifs_put_tcp_session(srvTcp);
2329
2330                 down(&pSesInfo->sesSem);
2331                 if (pSesInfo->need_reconnect) {
2332                         cFYI(1, ("Session needs reconnect"));
2333                         rc = cifs_setup_session(xid, pSesInfo,
2334                                                 cifs_sb->local_nls);
2335                 }
2336                 up(&pSesInfo->sesSem);
2337         } else if (!rc) {
2338                 cFYI(1, ("Existing smb sess not found"));
2339                 pSesInfo = sesInfoAlloc();
2340                 if (pSesInfo == NULL) {
2341                         rc = -ENOMEM;
2342                         goto mount_fail_check;
2343                 }
2344
2345                 /* new SMB session uses our srvTcp ref */
2346                 pSesInfo->server = srvTcp;
2347                 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2348                         sprintf(pSesInfo->serverName, "%pI6",
2349                                 &srvTcp->addr.sockAddr6.sin6_addr);
2350                 else
2351                         sprintf(pSesInfo->serverName, "%pI4",
2352                                 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2353
2354                 write_lock(&cifs_tcp_ses_lock);
2355                 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2356                 write_unlock(&cifs_tcp_ses_lock);
2357
2358                 /* volume_info->password freed at unmount */
2359                 if (volume_info->password) {
2360                         pSesInfo->password = kstrdup(volume_info->password,
2361                                                      GFP_KERNEL);
2362                         if (!pSesInfo->password) {
2363                                 rc = -ENOMEM;
2364                                 goto mount_fail_check;
2365                         }
2366                 }
2367                 if (volume_info->username)
2368                         strncpy(pSesInfo->userName, volume_info->username,
2369                                 MAX_USERNAME_SIZE);
2370                 if (volume_info->domainname) {
2371                         int len = strlen(volume_info->domainname);
2372                         pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2373                         if (pSesInfo->domainName)
2374                                 strcpy(pSesInfo->domainName,
2375                                         volume_info->domainname);
2376                 }
2377                 pSesInfo->linux_uid = volume_info->linux_uid;
2378                 pSesInfo->overrideSecFlg = volume_info->secFlg;
2379                 down(&pSesInfo->sesSem);
2380
2381                 /* BB FIXME need to pass vol->secFlgs BB */
2382                 rc = cifs_setup_session(xid, pSesInfo,
2383                                         cifs_sb->local_nls);
2384                 up(&pSesInfo->sesSem);
2385         }
2386
2387         /* search for existing tcon to this server share */
2388         if (!rc) {
2389                 setup_cifs_sb(volume_info, cifs_sb);
2390
2391                 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2392                 if (tcon) {
2393                         cFYI(1, ("Found match on UNC path"));
2394                         /* existing tcon already has a reference */
2395                         cifs_put_smb_ses(pSesInfo);
2396                         if (tcon->seal != volume_info->seal)
2397                                 cERROR(1, ("transport encryption setting "
2398                                            "conflicts with existing tid"));
2399                 } else {
2400                         tcon = tconInfoAlloc();
2401                         if (tcon == NULL) {
2402                                 rc = -ENOMEM;
2403                                 goto mount_fail_check;
2404                         }
2405
2406                         tcon->ses = pSesInfo;
2407                         if (volume_info->password) {
2408                                 tcon->password = kstrdup(volume_info->password,
2409                                                          GFP_KERNEL);
2410                                 if (!tcon->password) {
2411                                         rc = -ENOMEM;
2412                                         goto mount_fail_check;
2413                                 }
2414                         }
2415
2416                         if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2417                             && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2418                                 cERROR(1, ("Missing share name"));
2419                                 rc = -ENODEV;
2420                                 goto mount_fail_check;
2421                         } else {
2422                                 /* BB Do we need to wrap sesSem around
2423                                  * this TCon call and Unix SetFS as
2424                                  * we do on SessSetup and reconnect? */
2425                                 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2426                                               tcon, cifs_sb->local_nls);
2427                                 cFYI(1, ("CIFS Tcon rc = %d", rc));
2428                                 if (volume_info->nodfs) {
2429                                         tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2430                                         cFYI(1, ("DFS disabled (%d)",
2431                                                 tcon->Flags));
2432                                 }
2433                         }
2434                         if (rc)
2435                                 goto remote_path_check;
2436                         tcon->seal = volume_info->seal;
2437                         write_lock(&cifs_tcp_ses_lock);
2438                         list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2439                         write_unlock(&cifs_tcp_ses_lock);
2440                 }
2441
2442                 /* we can have only one retry value for a connection
2443                    to a share so for resources mounted more than once
2444                    to the same server share the last value passed in
2445                    for the retry flag is used */
2446                 tcon->retry = volume_info->retry;
2447                 tcon->nocase = volume_info->nocase;
2448                 tcon->local_lease = volume_info->local_lease;
2449         }
2450         if (pSesInfo) {
2451                 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2452                         sb->s_maxbytes = (u64) 1 << 63;
2453                 } else
2454                         sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2455         }
2456
2457         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2458         sb->s_time_gran = 100;
2459
2460         if (rc)
2461                 goto remote_path_check;
2462
2463         cifs_sb->tcon = tcon;
2464
2465         /* do not care if following two calls succeed - informational */
2466         if (!tcon->ipc) {
2467                 CIFSSMBQFSDeviceInfo(xid, tcon);
2468                 CIFSSMBQFSAttributeInfo(xid, tcon);
2469         }
2470
2471         /* tell server which Unix caps we support */
2472         if (tcon->ses->capabilities & CAP_UNIX)
2473                 /* reset of caps checks mount to see if unix extensions
2474                    disabled for just this mount */
2475                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2476         else
2477                 tcon->unix_ext = 0; /* server does not support them */
2478
2479         /* convert forward to back slashes in prepath here if needed */
2480         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2481                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2482
2483         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2484                 cifs_sb->rsize = 1024 * 127;
2485                 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2486         }
2487         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2488                 cifs_sb->wsize = min(cifs_sb->wsize,
2489                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2490         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2491                 cifs_sb->rsize = min(cifs_sb->rsize,
2492                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2493
2494 remote_path_check:
2495         /* check if a whole path (including prepath) is not remote */
2496         if (!rc && cifs_sb->prepathlen && tcon) {
2497                 /* build_path_to_root works only when we have a valid tcon */
2498                 full_path = cifs_build_path_to_root(cifs_sb);
2499                 if (full_path == NULL) {
2500                         rc = -ENOMEM;
2501                         goto mount_fail_check;
2502                 }
2503                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2504                 if (rc != -EREMOTE) {
2505                         kfree(full_path);
2506                         goto mount_fail_check;
2507                 }
2508                 kfree(full_path);
2509         }
2510
2511         /* get referral if needed */
2512         if (rc == -EREMOTE) {
2513 #ifdef CONFIG_CIFS_DFS_UPCALL
2514                 if (referral_walks_count > MAX_NESTED_LINKS) {
2515                         /*
2516                          * BB: when we implement proper loop detection,
2517                          *     we will remove this check. But now we need it
2518                          *     to prevent an indefinite loop if 'DFS tree' is
2519                          *     misconfigured (i.e. has loops).
2520                          */
2521                         rc = -ELOOP;
2522                         goto mount_fail_check;
2523                 }
2524                 /* convert forward to back slashes in prepath here if needed */
2525                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2526                         convert_delimiter(cifs_sb->prepath,
2527                                         CIFS_DIR_SEP(cifs_sb));
2528                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2529                 if (IS_ERR(full_path)) {
2530                         rc = PTR_ERR(full_path);
2531                         goto mount_fail_check;
2532                 }
2533
2534                 cFYI(1, ("Getting referral for: %s", full_path));
2535                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2536                         cifs_sb->local_nls, &num_referrals, &referrals,
2537                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2538                 if (!rc && num_referrals > 0) {
2539                         char *fake_devname = NULL;
2540
2541                         if (mount_data != mount_data_global)
2542                                 kfree(mount_data);
2543                         mount_data = cifs_compose_mount_options(
2544                                         cifs_sb->mountdata, full_path + 1,
2545                                         referrals, &fake_devname);
2546                         kfree(fake_devname);
2547                         free_dfs_info_array(referrals, num_referrals);
2548
2549                         if (tcon)
2550                                 cifs_put_tcon(tcon);
2551                         else if (pSesInfo)
2552                                 cifs_put_smb_ses(pSesInfo);
2553
2554                         cleanup_volume_info(&volume_info);
2555                         FreeXid(xid);
2556                         kfree(full_path);
2557                         referral_walks_count++;
2558                         goto try_mount_again;
2559                 }
2560 #else /* No DFS support, return error on mount */
2561                 rc = -EOPNOTSUPP;
2562 #endif
2563         }
2564
2565 mount_fail_check:
2566         /* on error free sesinfo and tcon struct if needed */
2567         if (rc) {
2568                 if (mount_data != mount_data_global)
2569                         kfree(mount_data);
2570                 /* If find_unc succeeded then rc == 0 so we can not end */
2571                 /* up accidently freeing someone elses tcon struct */
2572                 if (tcon)
2573                         cifs_put_tcon(tcon);
2574                 else if (pSesInfo)
2575                         cifs_put_smb_ses(pSesInfo);
2576                 else
2577                         cifs_put_tcp_session(srvTcp);
2578                 goto out;
2579         }
2580
2581         /* volume_info->password is freed above when existing session found
2582         (in which case it is not needed anymore) but when new sesion is created
2583         the password ptr is put in the new session structure (in which case the
2584         password will be freed at unmount time) */
2585 out:
2586         /* zero out password before freeing */
2587         cleanup_volume_info(&volume_info);
2588         FreeXid(xid);
2589         return rc;
2590 }
2591
2592 int
2593 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2594          const char *tree, struct cifsTconInfo *tcon,
2595          const struct nls_table *nls_codepage)
2596 {
2597         struct smb_hdr *smb_buffer;
2598         struct smb_hdr *smb_buffer_response;
2599         TCONX_REQ *pSMB;
2600         TCONX_RSP *pSMBr;
2601         unsigned char *bcc_ptr;
2602         int rc = 0;
2603         int length, bytes_left;
2604         __u16 count;
2605
2606         if (ses == NULL)
2607                 return -EIO;
2608
2609         smb_buffer = cifs_buf_get();
2610         if (smb_buffer == NULL) {
2611                 return -ENOMEM;
2612         }
2613         smb_buffer_response = smb_buffer;
2614
2615         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2616                         NULL /*no tid */ , 4 /*wct */ );
2617
2618         smb_buffer->Mid = GetNextMid(ses->server);
2619         smb_buffer->Uid = ses->Suid;
2620         pSMB = (TCONX_REQ *) smb_buffer;
2621         pSMBr = (TCONX_RSP *) smb_buffer_response;
2622
2623         pSMB->AndXCommand = 0xFF;
2624         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2625         bcc_ptr = &pSMB->Password[0];
2626         if ((ses->server->secMode) & SECMODE_USER) {
2627                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2628                 *bcc_ptr = 0; /* password is null byte */
2629                 bcc_ptr++;              /* skip password */
2630                 /* already aligned so no need to do it below */
2631         } else {
2632                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2633                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2634                    specified as required (when that support is added to
2635                    the vfs in the future) as only NTLM or the much
2636                    weaker LANMAN (which we do not send by default) is accepted
2637                    by Samba (not sure whether other servers allow
2638                    NTLMv2 password here) */
2639 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2640                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2641                     (ses->server->secType == LANMAN))
2642                         calc_lanman_hash(tcon->password, ses->server->cryptKey,
2643                                          ses->server->secMode &
2644                                             SECMODE_PW_ENCRYPT ? true : false,
2645                                          bcc_ptr);
2646                 else
2647 #endif /* CIFS_WEAK_PW_HASH */
2648                 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2649                              bcc_ptr);
2650
2651                 bcc_ptr += CIFS_SESS_KEY_SIZE;
2652                 if (ses->capabilities & CAP_UNICODE) {
2653                         /* must align unicode strings */
2654                         *bcc_ptr = 0; /* null byte password */
2655                         bcc_ptr++;
2656                 }
2657         }
2658
2659         if (ses->server->secMode &
2660                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2661                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2662
2663         if (ses->capabilities & CAP_STATUS32) {
2664                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2665         }
2666         if (ses->capabilities & CAP_DFS) {
2667                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2668         }
2669         if (ses->capabilities & CAP_UNICODE) {
2670                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2671                 length =
2672                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2673                         6 /* max utf8 char length in bytes */ *
2674                         (/* server len*/ + 256 /* share len */), nls_codepage);
2675                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
2676                 bcc_ptr += 2;   /* skip trailing null */
2677         } else {                /* ASCII */
2678                 strcpy(bcc_ptr, tree);
2679                 bcc_ptr += strlen(tree) + 1;
2680         }
2681         strcpy(bcc_ptr, "?????");
2682         bcc_ptr += strlen("?????");
2683         bcc_ptr += 1;
2684         count = bcc_ptr - &pSMB->Password[0];
2685         pSMB->hdr.smb_buf_length += count;
2686         pSMB->ByteCount = cpu_to_le16(count);
2687
2688         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2689                          CIFS_STD_OP);
2690
2691         /* above now done in SendReceive */
2692         if ((rc == 0) && (tcon != NULL)) {
2693                 bool is_unicode;
2694
2695                 tcon->tidStatus = CifsGood;
2696                 tcon->need_reconnect = false;
2697                 tcon->tid = smb_buffer_response->Tid;
2698                 bcc_ptr = pByteArea(smb_buffer_response);
2699                 bytes_left = BCC(smb_buffer_response);
2700                 length = strnlen(bcc_ptr, bytes_left - 2);
2701                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2702                         is_unicode = true;
2703                 else
2704                         is_unicode = false;
2705
2706
2707                 /* skip service field (NB: this field is always ASCII) */
2708                 if (length == 3) {
2709                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2710                             (bcc_ptr[2] == 'C')) {
2711                                 cFYI(1, ("IPC connection"));
2712                                 tcon->ipc = 1;
2713                         }
2714                 } else if (length == 2) {
2715                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2716                                 /* the most common case */
2717                                 cFYI(1, ("disk share connection"));
2718                         }
2719                 }
2720                 bcc_ptr += length + 1;
2721                 bytes_left -= (length + 1);
2722                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2723
2724                 /* mostly informational -- no need to fail on error here */
2725                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2726                                                       bytes_left, is_unicode,
2727                                                       nls_codepage);
2728
2729                 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2730
2731                 if ((smb_buffer_response->WordCount == 3) ||
2732                          (smb_buffer_response->WordCount == 7))
2733                         /* field is in same location */
2734                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2735                 else
2736                         tcon->Flags = 0;
2737                 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2738         } else if ((rc == 0) && tcon == NULL) {
2739                 /* all we need to save for IPC$ connection */
2740                 ses->ipc_tid = smb_buffer_response->Tid;
2741         }
2742
2743         cifs_buf_release(smb_buffer);
2744         return rc;
2745 }
2746
2747 int
2748 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2749 {
2750         int rc = 0;
2751         char *tmp;
2752
2753         if (cifs_sb->tcon)
2754                 cifs_put_tcon(cifs_sb->tcon);
2755
2756         cifs_sb->tcon = NULL;
2757         tmp = cifs_sb->prepath;
2758         cifs_sb->prepathlen = 0;
2759         cifs_sb->prepath = NULL;
2760         kfree(tmp);
2761
2762         return rc;
2763 }
2764
2765 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2766                                            struct nls_table *nls_info)
2767 {
2768         int rc = 0;
2769         int first_time = 0;
2770         struct TCP_Server_Info *server = pSesInfo->server;
2771
2772         /* what if server changes its buffer size after dropping the session? */
2773         if (server->maxBuf == 0) /* no need to send on reconnect */ {
2774                 rc = CIFSSMBNegotiate(xid, pSesInfo);
2775                 if (rc == -EAGAIN) {
2776                         /* retry only once on 1st time connection */
2777                         rc = CIFSSMBNegotiate(xid, pSesInfo);
2778                         if (rc == -EAGAIN)
2779                                 rc = -EHOSTDOWN;
2780                 }
2781                 if (rc == 0) {
2782                         spin_lock(&GlobalMid_Lock);
2783                         if (server->tcpStatus != CifsExiting)
2784                                 server->tcpStatus = CifsGood;
2785                         else
2786                                 rc = -EHOSTDOWN;
2787                         spin_unlock(&GlobalMid_Lock);
2788
2789                 }
2790                 first_time = 1;
2791         }
2792
2793         if (rc)
2794                 goto ss_err_exit;
2795
2796         pSesInfo->flags = 0;
2797         pSesInfo->capabilities = server->capabilities;
2798         if (linuxExtEnabled == 0)
2799                 pSesInfo->capabilities &= (~CAP_UNIX);
2800
2801         cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2802                  server->secMode, server->capabilities, server->timeAdj));
2803
2804         rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2805         if (rc) {
2806                 cERROR(1, ("Send error in SessSetup = %d", rc));
2807         } else {
2808                 cFYI(1, ("CIFS Session Established successfully"));
2809                 spin_lock(&GlobalMid_Lock);
2810                 pSesInfo->status = CifsGood;
2811                 pSesInfo->need_reconnect = false;
2812                 spin_unlock(&GlobalMid_Lock);
2813         }
2814
2815 ss_err_exit:
2816         return rc;
2817 }
2818