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   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 *in6_addr;   /* ipv6 address as human readable form of in6_addr */
  66         char *iocharset;  /* local code page for mapping to and from Unicode */
  67         char source_rfc1001_name[16]; /* netbios name of client */
  68         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  69         uid_t linux_uid;
  70         gid_t linux_gid;
  71         mode_t file_mode;
  72         mode_t dir_mode;
  73         unsigned secFlg;
  74         bool rw:1;
  75         bool retry:1;
  76         bool intr:1;
  77         bool setuids:1;
  78         bool override_uid:1;
  79         bool override_gid:1;
  80         bool dynperm:1;
  81         bool noperm:1;
  82         bool no_psx_acl:1; /* set if posix acl support should be disabled */
  83         bool cifs_acl:1;
  84         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
  85         bool server_ino:1; /* use inode numbers from server ie UniqueId */
  86         bool direct_io:1;
  87         bool remap:1;      /* set to remap seven reserved chars in filenames */
  88         bool posix_paths:1; /* unset to not ask for posix pathnames. */
  89         bool no_linux_ext:1;
  90         bool sfu_emul:1;
  91         bool nullauth:1;   /* attempt to authenticate with null user */
  92         bool nocase:1;     /* request case insensitive filenames */
  93         bool nobrl:1;      /* disable sending byte range locks to srv */
  94         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
  95         bool seal:1;       /* request transport encryption on share */
  96         bool nodfs:1;      /* Do not request DFS, even if available */
  97         bool local_lease:1; /* check leases only on local system, not remote */
  98         bool noblocksnd:1;
  99         bool noautotune:1;
 100         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 101         unsigned int rsize;
 102         unsigned int wsize;
 103         unsigned int sockopt;
 104         unsigned short int port;
 105         char *prepath;
 106 };
 107
 108 static int ipv4_connect(struct TCP_Server_Info *server);
 109 static int ipv6_connect(struct TCP_Server_Info *server);
 110
 111 /*
 112  * cifs tcp session reconnection
 113  *
 114  * mark tcp session as reconnecting so temporarily locked
 115  * mark all smb sessions as reconnecting for tcp session
 116  * reconnect tcp session
 117  * wake up waiters on reconnection? - (not needed currently)
 118  */
 119 static int
 120 cifs_reconnect(struct TCP_Server_Info *server)
 121 {
 122         int rc = 0;
 123         struct list_head *tmp, *tmp2;
 124         struct cifsSesInfo *ses;
 125         struct cifsTconInfo *tcon;
 126         struct mid_q_entry *mid_entry;
 127
 128         spin_lock(&GlobalMid_Lock);
 129         if (server->tcpStatus == CifsExiting) {
 130                 /* the demux thread will exit normally
 131                 next time through the loop */
 132                 spin_unlock(&GlobalMid_Lock);
 133                 return rc;
 134         } else
 135                 server->tcpStatus = CifsNeedReconnect;
 136         spin_unlock(&GlobalMid_Lock);
 137         server->maxBuf = 0;
 138
 139         cFYI(1, ("Reconnecting tcp session"));
 140
 141         /* before reconnecting the tcp session, mark the smb session (uid)
 142                 and the tid bad so they are not used until reconnected */
 143         read_lock(&cifs_tcp_ses_lock);
 144         list_for_each(tmp, &server->smb_ses_list) {
 145                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 146                 ses->need_reconnect = true;
 147                 ses->ipc_tid = 0;
 148                 list_for_each(tmp2, &ses->tcon_list) {
 149                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 150                         tcon->need_reconnect = true;
 151                 }
 152         }
 153         read_unlock(&cifs_tcp_ses_lock);
 154         /* do not want to be sending data on a socket we are freeing */
 155         mutex_lock(&server->srv_mutex);
 156         if (server->ssocket) {
 157                 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
 158                         server->ssocket->flags));
 159                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 160                 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
 161                         server->ssocket->state,
 162                         server->ssocket->flags));
 163                 sock_release(server->ssocket);
 164                 server->ssocket = NULL;
 165         }
 166
 167         spin_lock(&GlobalMid_Lock);
 168         list_for_each(tmp, &server->pending_mid_q) {
 169                 mid_entry = list_entry(tmp, struct
 170                                         mid_q_entry,
 171                                         qhead);
 172                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 173                                 /* Mark other intransit requests as needing
 174                                    retry so we do not immediately mark the
 175                                    session bad again (ie after we reconnect
 176                                    below) as they timeout too */
 177                         mid_entry->midState = MID_RETRY_NEEDED;
 178                 }
 179         }
 180         spin_unlock(&GlobalMid_Lock);
 181         mutex_unlock(&server->srv_mutex);
 182
 183         while ((server->tcpStatus != CifsExiting) &&
 184                (server->tcpStatus != CifsGood)) {
 185                 try_to_freeze();
 186                 if (server->addr.sockAddr6.sin6_family == AF_INET6)
 187                         rc = ipv6_connect(server);
 188                 else
 189                         rc = ipv4_connect(server);
 190                 if (rc) {
 191                         cFYI(1, ("reconnect error %d", rc));
 192                         msleep(3000);
 193                 } else {
 194                         atomic_inc(&tcpSesReconnectCount);
 195                         spin_lock(&GlobalMid_Lock);
 196                         if (server->tcpStatus != CifsExiting)
 197                                 server->tcpStatus = CifsGood;
 198                         server->sequence_number = 0;
 199                         spin_unlock(&GlobalMid_Lock);
 200         /*              atomic_set(&server->inFlight,0);*/
 201                         wake_up(&server->response_q);
 202                 }
 203         }
 204         return rc;
 205 }
 206
 207 /*
 208         return codes:
 209                 0       not a transact2, or all data present
 210                 >0      transact2 with that much data missing
 211                 -EINVAL = invalid transact2
 212
 213  */
 214 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 215 {
 216         struct smb_t2_rsp *pSMBt;
 217         int total_data_size;
 218         int data_in_this_rsp;
 219         int remaining;
 220
 221         if (pSMB->Command != SMB_COM_TRANSACTION2)
 222                 return 0;
 223
 224         /* check for plausible wct, bcc and t2 data and parm sizes */
 225         /* check for parm and data offset going beyond end of smb */
 226         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 227                 cFYI(1, ("invalid transact2 word count"));
 228                 return -EINVAL;
 229         }
 230
 231         pSMBt = (struct smb_t2_rsp *)pSMB;
 232
 233         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 234         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 235
 236         remaining = total_data_size - data_in_this_rsp;
 237
 238         if (remaining == 0)
 239                 return 0;
 240         else if (remaining < 0) {
 241                 cFYI(1, ("total data %d smaller than data in frame %d",
 242                         total_data_size, data_in_this_rsp));
 243                 return -EINVAL;
 244         } else {
 245                 cFYI(1, ("missing %d bytes from transact2, check next response",
 246                         remaining));
 247                 if (total_data_size > maxBufSize) {
 248                         cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
 249                                 total_data_size, maxBufSize));
 250                         return -EINVAL;
 251                 }
 252                 return remaining;
 253         }
 254 }
 255
 256 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 257 {
 258         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 259         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 260         int total_data_size;
 261         int total_in_buf;
 262         int remaining;
 263         int total_in_buf2;
 264         char *data_area_of_target;
 265         char *data_area_of_buf2;
 266         __u16 byte_count;
 267
 268         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 269
 270         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 271                 cFYI(1, ("total data size of primary and secondary t2 differ"));
 272         }
 273
 274         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 275
 276         remaining = total_data_size - total_in_buf;
 277
 278         if (remaining < 0)
 279                 return -EINVAL;
 280
 281         if (remaining == 0) /* nothing to do, ignore */
 282                 return 0;
 283
 284         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 285         if (remaining < total_in_buf2) {
 286                 cFYI(1, ("transact2 2nd response contains too much data"));
 287         }
 288
 289         /* find end of first SMB data area */
 290         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 291                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 292         /* validate target area */
 293
 294         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 295                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 296
 297         data_area_of_target += total_in_buf;
 298
 299         /* copy second buffer into end of first buffer */
 300         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 301         total_in_buf += total_in_buf2;
 302         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 303         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 304         byte_count += total_in_buf2;
 305         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 306
 307         byte_count = pTargetSMB->smb_buf_length;
 308         byte_count += total_in_buf2;
 309
 310         /* BB also add check that we are not beyond maximum buffer size */
 311
 312         pTargetSMB->smb_buf_length = byte_count;
 313
 314         if (remaining == total_in_buf2) {
 315                 cFYI(1, ("found the last secondary response"));
 316                 return 0; /* we are done */
 317         } else /* more responses to go */
 318                 return 1;
 319
 320 }
 321
 322 static int
 323 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 324 {
 325         int length;
 326         unsigned int pdu_length, total_read;
 327         struct smb_hdr *smb_buffer = NULL;
 328         struct smb_hdr *bigbuf = NULL;
 329         struct smb_hdr *smallbuf = NULL;
 330         struct msghdr smb_msg;
 331         struct kvec iov;
 332         struct socket *csocket = server->ssocket;
 333         struct list_head *tmp;
 334         struct cifsSesInfo *ses;
 335         struct task_struct *task_to_wake = NULL;
 336         struct mid_q_entry *mid_entry;
 337         char temp;
 338         bool isLargeBuf = false;
 339         bool isMultiRsp;
 340         int reconnect;
 341
 342         current->flags |= PF_MEMALLOC;
 343         cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
 344
 345         length = atomic_inc_return(&tcpSesAllocCount);
 346         if (length > 1)
 347                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 348                                 GFP_KERNEL);
 349
 350         set_freezable();
 351         while (server->tcpStatus != CifsExiting) {
 352                 if (try_to_freeze())
 353                         continue;
 354                 if (bigbuf == NULL) {
 355                         bigbuf = cifs_buf_get();
 356                         if (!bigbuf) {
 357                                 cERROR(1, ("No memory for large SMB response"));
 358                                 msleep(3000);
 359                                 /* retry will check if exiting */
 360                                 continue;
 361                         }
 362                 } else if (isLargeBuf) {
 363                         /* we are reusing a dirty large buf, clear its start */
 364                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 365                 }
 366
 367                 if (smallbuf == NULL) {
 368                         smallbuf = cifs_small_buf_get();
 369                         if (!smallbuf) {
 370                                 cERROR(1, ("No memory for SMB response"));
 371                                 msleep(1000);
 372                                 /* retry will check if exiting */
 373                                 continue;
 374                         }
 375                         /* beginning of smb buffer is cleared in our buf_get */
 376                 } else /* if existing small buf clear beginning */
 377                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 378
 379                 isLargeBuf = false;
 380                 isMultiRsp = false;
 381                 smb_buffer = smallbuf;
 382                 iov.iov_base = smb_buffer;
 383                 iov.iov_len = 4;
 384                 smb_msg.msg_control = NULL;
 385                 smb_msg.msg_controllen = 0;
 386                 pdu_length = 4; /* enough to get RFC1001 header */
 387 incomplete_rcv:
 388                 length =
 389                     kernel_recvmsg(csocket, &smb_msg,
 390                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 391
 392                 if (server->tcpStatus == CifsExiting) {
 393                         break;
 394                 } else if (server->tcpStatus == CifsNeedReconnect) {
 395                         cFYI(1, ("Reconnect after server stopped responding"));
 396                         cifs_reconnect(server);
 397                         cFYI(1, ("call to reconnect done"));
 398                         csocket = server->ssocket;
 399                         continue;
 400                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 401                         msleep(1); /* minimum sleep to prevent looping
 402                                 allowing socket to clear and app threads to set
 403                                 tcpStatus CifsNeedReconnect if server hung */
 404                         if (pdu_length < 4) {
 405                                 iov.iov_base = (4 - pdu_length) +
 406                                                         (char *)smb_buffer;
 407                                 iov.iov_len = pdu_length;
 408                                 smb_msg.msg_control = NULL;
 409                                 smb_msg.msg_controllen = 0;
 410                                 goto incomplete_rcv;
 411                         } else
 412                                 continue;
 413                 } else if (length <= 0) {
 414                         if (server->tcpStatus == CifsNew) {
 415                                 cFYI(1, ("tcp session abend after SMBnegprot"));
 416                                 /* some servers kill the TCP session rather than
 417                                    returning an SMB negprot error, in which
 418                                    case reconnecting here is not going to help,
 419                                    and so simply return error to mount */
 420                                 break;
 421                         }
 422                         if (!try_to_freeze() && (length == -EINTR)) {
 423                                 cFYI(1, ("cifsd thread killed"));
 424                                 break;
 425                         }
 426                         cFYI(1, ("Reconnect after unexpected peek error %d",
 427                                 length));
 428                         cifs_reconnect(server);
 429                         csocket = server->ssocket;
 430                         wake_up(&server->response_q);
 431                         continue;
 432                 } else if (length < pdu_length) {
 433                         cFYI(1, ("requested %d bytes but only got %d bytes",
 434                                   pdu_length, length));
 435                         pdu_length -= length;
 436                         msleep(1);
 437                         goto incomplete_rcv;
 438                 }
 439
 440                 /* The right amount was read from socket - 4 bytes */
 441                 /* so we can now interpret the length field */
 442
 443                 /* the first byte big endian of the length field,
 444                 is actually not part of the length but the type
 445                 with the most common, zero, as regular data */
 446                 temp = *((char *) smb_buffer);
 447
 448                 /* Note that FC 1001 length is big endian on the wire,
 449                 but we convert it here so it is always manipulated
 450                 as host byte order */
 451                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 452                 smb_buffer->smb_buf_length = pdu_length;
 453
 454                 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
 455
 456                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 457                         continue;
 458                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 459                         cFYI(1, ("Good RFC 1002 session rsp"));
 460                         continue;
 461                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 462                         /* we get this from Windows 98 instead of
 463                            an error on SMB negprot response */
 464                         cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
 465                                 pdu_length));
 466                         if (server->tcpStatus == CifsNew) {
 467                                 /* if nack on negprot (rather than
 468                                 ret of smb negprot error) reconnecting
 469                                 not going to help, ret error to mount */
 470                                 break;
 471                         } else {
 472                                 /* give server a second to
 473                                 clean up before reconnect attempt */
 474                                 msleep(1000);
 475                                 /* always try 445 first on reconnect
 476                                 since we get NACK on some if we ever
 477                                 connected to port 139 (the NACK is
 478                                 since we do not begin with RFC1001
 479                                 session initialize frame) */
 480                                 server->addr.sockAddr.sin_port =
 481                                         htons(CIFS_PORT);
 482                                 cifs_reconnect(server);
 483                                 csocket = server->ssocket;
 484                                 wake_up(&server->response_q);
 485                                 continue;
 486                         }
 487                 } else if (temp != (char) 0) {
 488                         cERROR(1, ("Unknown RFC 1002 frame"));
 489                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 490                                       length);
 491                         cifs_reconnect(server);
 492                         csocket = server->ssocket;
 493                         continue;
 494                 }
 495
 496                 /* else we have an SMB response */
 497                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 498                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 499                         cERROR(1, ("Invalid size SMB length %d pdu_length %d",
 500                                         length, pdu_length+4));
 501                         cifs_reconnect(server);
 502                         csocket = server->ssocket;
 503                         wake_up(&server->response_q);
 504                         continue;
 505                 }
 506
 507                 /* else length ok */
 508                 reconnect = 0;
 509
 510                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 511                         isLargeBuf = true;
 512                         memcpy(bigbuf, smallbuf, 4);
 513                         smb_buffer = bigbuf;
 514                 }
 515                 length = 0;
 516                 iov.iov_base = 4 + (char *)smb_buffer;
 517                 iov.iov_len = pdu_length;
 518                 for (total_read = 0; total_read < pdu_length;
 519                      total_read += length) {
 520                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 521                                                 pdu_length - total_read, 0);
 522                         if ((server->tcpStatus == CifsExiting) ||
 523                             (length == -EINTR)) {
 524                                 /* then will exit */
 525                                 reconnect = 2;
 526                                 break;
 527                         } else if (server->tcpStatus == CifsNeedReconnect) {
 528                                 cifs_reconnect(server);
 529                                 csocket = server->ssocket;
 530                                 /* Reconnect wakes up rspns q */
 531                                 /* Now we will reread sock */
 532                                 reconnect = 1;
 533                                 break;
 534                         } else if ((length == -ERESTARTSYS) ||
 535                                    (length == -EAGAIN)) {
 536                                 msleep(1); /* minimum sleep to prevent looping,
 537                                               allowing socket to clear and app
 538                                               threads to set tcpStatus
 539                                               CifsNeedReconnect if server hung*/
 540                                 length = 0;
 541                                 continue;
 542                         } else if (length <= 0) {
 543                                 cERROR(1, ("Received no data, expecting %d",
 544                                               pdu_length - total_read));
 545                                 cifs_reconnect(server);
 546                                 csocket = server->ssocket;
 547                                 reconnect = 1;
 548                                 break;
 549                         }
 550                 }
 551                 if (reconnect == 2)
 552                         break;
 553                 else if (reconnect == 1)
 554                         continue;
 555
 556                 length += 4; /* account for rfc1002 hdr */
 557
 558
 559                 dump_smb(smb_buffer, length);
 560                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 561                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 562                         continue;
 563                 }
 564
 565
 566                 task_to_wake = NULL;
 567                 spin_lock(&GlobalMid_Lock);
 568                 list_for_each(tmp, &server->pending_mid_q) {
 569                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 570
 571                         if ((mid_entry->mid == smb_buffer->Mid) &&
 572                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 573                             (mid_entry->command == smb_buffer->Command)) {
 574                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 575                                         /* We have a multipart transact2 resp */
 576                                         isMultiRsp = true;
 577                                         if (mid_entry->resp_buf) {
 578                                                 /* merge response - fix up 1st*/
 579                                                 if (coalesce_t2(smb_buffer,
 580                                                         mid_entry->resp_buf)) {
 581                                                         mid_entry->multiRsp =
 582                                                                  true;
 583                                                         break;
 584                                                 } else {
 585                                                         /* all parts received */
 586                                                         mid_entry->multiEnd =
 587                                                                  true;
 588                                                         goto multi_t2_fnd;
 589                                                 }
 590                                         } else {
 591                                                 if (!isLargeBuf) {
 592                                                         cERROR(1,("1st trans2 resp needs bigbuf"));
 593                                         /* BB maybe we can fix this up,  switch
 594                                            to already allocated large buffer? */
 595                                                 } else {
 596                                                         /* Have first buffer */
 597                                                         mid_entry->resp_buf =
 598                                                                  smb_buffer;
 599                                                         mid_entry->largeBuf =
 600                                                                  true;
 601                                                         bigbuf = NULL;
 602                                                 }
 603                                         }
 604                                         break;
 605                                 }
 606                                 mid_entry->resp_buf = smb_buffer;
 607                                 mid_entry->largeBuf = isLargeBuf;
 608 multi_t2_fnd:
 609                                 task_to_wake = mid_entry->tsk;
 610                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 611 #ifdef CONFIG_CIFS_STATS2
 612                                 mid_entry->when_received = jiffies;
 613 #endif
 614                                 /* so we do not time out requests to  server
 615                                 which is still responding (since server could
 616                                 be busy but not dead) */
 617                                 server->lstrp = jiffies;
 618                                 break;
 619                         }
 620                 }
 621                 spin_unlock(&GlobalMid_Lock);
 622                 if (task_to_wake) {
 623                         /* Was previous buf put in mpx struct for multi-rsp? */
 624                         if (!isMultiRsp) {
 625                                 /* smb buffer will be freed by user thread */
 626                                 if (isLargeBuf)
 627                                         bigbuf = NULL;
 628                                 else
 629                                         smallbuf = NULL;
 630                         }
 631                         wake_up_process(task_to_wake);
 632                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 633                            !isMultiRsp) {
 634                         cERROR(1, ("No task to wake, unknown frame received! "
 635                                    "NumMids %d", midCount.counter));
 636                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 637                                       sizeof(struct smb_hdr));
 638 #ifdef CONFIG_CIFS_DEBUG2
 639                         cifs_dump_detail(smb_buffer);
 640                         cifs_dump_mids(server);
 641 #endif /* CIFS_DEBUG2 */
 642
 643                 }
 644         } /* end while !EXITING */
 645
 646         /* take it off the list, if it's not already */
 647         write_lock(&cifs_tcp_ses_lock);
 648         list_del_init(&server->tcp_ses_list);
 649         write_unlock(&cifs_tcp_ses_lock);
 650
 651         spin_lock(&GlobalMid_Lock);
 652         server->tcpStatus = CifsExiting;
 653         spin_unlock(&GlobalMid_Lock);
 654         wake_up_all(&server->response_q);
 655
 656         /* check if we have blocked requests that need to free */
 657         /* Note that cifs_max_pending is normally 50, but
 658         can be set at module install time to as little as two */
 659         spin_lock(&GlobalMid_Lock);
 660         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 661                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 662         /* We do not want to set the max_pending too low or we
 663         could end up with the counter going negative */
 664         spin_unlock(&GlobalMid_Lock);
 665         /* Although there should not be any requests blocked on
 666         this queue it can not hurt to be paranoid and try to wake up requests
 667         that may haven been blocked when more than 50 at time were on the wire
 668         to the same server - they now will see the session is in exit state
 669         and get out of SendReceive.  */
 670         wake_up_all(&server->request_q);
 671         /* give those requests time to exit */
 672         msleep(125);
 673
 674         if (server->ssocket) {
 675                 sock_release(csocket);
 676                 server->ssocket = NULL;
 677         }
 678         /* buffer usuallly freed in free_mid - need to free it here on exit */
 679         cifs_buf_release(bigbuf);
 680         if (smallbuf) /* no sense logging a debug message if NULL */
 681                 cifs_small_buf_release(smallbuf);
 682
 683         /*
 684          * BB: we shouldn't have to do any of this. It shouldn't be
 685          * possible to exit from the thread with active SMB sessions
 686          */
 687         read_lock(&cifs_tcp_ses_lock);
 688         if (list_empty(&server->pending_mid_q)) {
 689                 /* loop through server session structures attached to this and
 690                     mark them dead */
 691                 list_for_each(tmp, &server->smb_ses_list) {
 692                         ses = list_entry(tmp, struct cifsSesInfo,
 693                                          smb_ses_list);
 694                         ses->status = CifsExiting;
 695                         ses->server = NULL;
 696                 }
 697                 read_unlock(&cifs_tcp_ses_lock);
 698         } else {
 699                 /* although we can not zero the server struct pointer yet,
 700                 since there are active requests which may depnd on them,
 701                 mark the corresponding SMB sessions as exiting too */
 702                 list_for_each(tmp, &server->smb_ses_list) {
 703                         ses = list_entry(tmp, struct cifsSesInfo,
 704                                          smb_ses_list);
 705                         ses->status = CifsExiting;
 706                 }
 707
 708                 spin_lock(&GlobalMid_Lock);
 709                 list_for_each(tmp, &server->pending_mid_q) {
 710                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 711                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 712                                 cFYI(1, ("Clearing Mid 0x%x - waking up ",
 713                                          mid_entry->mid));
 714                                 task_to_wake = mid_entry->tsk;
 715                                 if (task_to_wake)
 716                                         wake_up_process(task_to_wake);
 717                         }
 718                 }
 719                 spin_unlock(&GlobalMid_Lock);
 720                 read_unlock(&cifs_tcp_ses_lock);
 721                 /* 1/8th of sec is more than enough time for them to exit */
 722                 msleep(125);
 723         }
 724
 725         if (!list_empty(&server->pending_mid_q)) {
 726                 /* mpx threads have not exited yet give them
 727                 at least the smb send timeout time for long ops */
 728                 /* due to delays on oplock break requests, we need
 729                 to wait at least 45 seconds before giving up
 730                 on a request getting a response and going ahead
 731                 and killing cifsd */
 732                 cFYI(1, ("Wait for exit from demultiplex thread"));
 733                 msleep(46000);
 734                 /* if threads still have not exited they are probably never
 735                 coming home not much else we can do but free the memory */
 736         }
 737
 738         /* last chance to mark ses pointers invalid
 739         if there are any pointing to this (e.g
 740         if a crazy root user tried to kill cifsd
 741         kernel thread explicitly this might happen) */
 742         /* BB: This shouldn't be necessary, see above */
 743         read_lock(&cifs_tcp_ses_lock);
 744         list_for_each(tmp, &server->smb_ses_list) {
 745                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 746                 ses->server = NULL;
 747         }
 748         read_unlock(&cifs_tcp_ses_lock);
 749
 750         kfree(server->hostname);
 751         task_to_wake = xchg(&server->tsk, NULL);
 752         kfree(server);
 753
 754         length = atomic_dec_return(&tcpSesAllocCount);
 755         if (length  > 0)
 756                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 757                                 GFP_KERNEL);
 758
 759         /* if server->tsk was NULL then wait for a signal before exiting */
 760         if (!task_to_wake) {
 761                 set_current_state(TASK_INTERRUPTIBLE);
 762                 while (!signal_pending(current)) {
 763                         schedule();
 764                         set_current_state(TASK_INTERRUPTIBLE);
 765                 }
 766                 set_current_state(TASK_RUNNING);
 767         }
 768
 769         module_put_and_exit(0);
 770 }
 771
 772 /* extract the host portion of the UNC string */
 773 static char *
 774 extract_hostname(const char *unc)
 775 {
 776         const char *src;
 777         char *dst, *delim;
 778         unsigned int len;
 779
 780         /* skip double chars at beginning of string */
 781         /* BB: check validity of these bytes? */
 782         src = unc + 2;
 783
 784         /* delimiter between hostname and sharename is always '\\' now */
 785         delim = strchr(src, '\\');
 786         if (!delim)
 787                 return ERR_PTR(-EINVAL);
 788
 789         len = delim - src;
 790         dst = kmalloc((len + 1), GFP_KERNEL);
 791         if (dst == NULL)
 792                 return ERR_PTR(-ENOMEM);
 793
 794         memcpy(dst, src, len);
 795         dst[len] = '\0';
 796
 797         return dst;
 798 }
 799
 800 static int
 801 cifs_parse_mount_options(char *options, const char *devname,
 802                          struct smb_vol *vol)
 803 {
 804         char *value;
 805         char *data;
 806         unsigned int  temp_len, i, j;
 807         char separator[2];
 808
 809         separator[0] = ',';
 810         separator[1] = 0;
 811
 812         if (Local_System_Name[0] != 0)
 813                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 814         else {
 815                 char *nodename = utsname()->nodename;
 816                 int n = strnlen(nodename, 15);
 817                 memset(vol->source_rfc1001_name, 0x20, 15);
 818                 for (i = 0; i < n; i++) {
 819                         /* does not have to be perfect mapping since field is
 820                         informational, only used for servers that do not support
 821                         port 445 and it can be overridden at mount time */
 822                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 823                 }
 824         }
 825         vol->source_rfc1001_name[15] = 0;
 826         /* null target name indicates to use *SMBSERVR default called name
 827            if we end up sending RFC1001 session initialize */
 828         vol->target_rfc1001_name[0] = 0;
 829         vol->linux_uid = current_uid();  /* use current_euid() instead? */
 830         vol->linux_gid = current_gid();
 831
 832         /* default to only allowing write access to owner of the mount */
 833         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 834
 835         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 836         vol->rw = true;
 837         /* default is always to request posix paths. */
 838         vol->posix_paths = 1;
 839         /* default to using server inode numbers where available */
 840         vol->server_ino = 1;
 841
 842         if (!options)
 843                 return 1;
 844
 845         if (strncmp(options, "sep=", 4) == 0) {
 846                 if (options[4] != 0) {
 847                         separator[0] = options[4];
 848                         options += 5;
 849                 } else {
 850                         cFYI(1, ("Null separator not allowed"));
 851                 }
 852         }
 853
 854         while ((data = strsep(&options, separator)) != NULL) {
 855                 if (!*data)
 856                         continue;
 857                 if ((value = strchr(data, '=')) != NULL)
 858                         *value++ = '\0';
 859
 860                 /* Have to parse this before we parse for "user" */
 861                 if (strnicmp(data, "user_xattr", 10) == 0) {
 862                         vol->no_xattr = 0;
 863                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 864                         vol->no_xattr = 1;
 865                 } else if (strnicmp(data, "user", 4) == 0) {
 866                         if (!value) {
 867                                 printk(KERN_WARNING
 868                                        "CIFS: invalid or missing username\n");
 869                                 return 1;       /* needs_arg; */
 870                         } else if (!*value) {
 871                                 /* null user, ie anonymous, authentication */
 872                                 vol->nullauth = 1;
 873                         }
 874                         if (strnlen(value, 200) < 200) {
 875                                 vol->username = value;
 876                         } else {
 877                                 printk(KERN_WARNING "CIFS: username too long\n");
 878                                 return 1;
 879                         }
 880                 } else if (strnicmp(data, "pass", 4) == 0) {
 881                         if (!value) {
 882                                 vol->password = NULL;
 883                                 continue;
 884                         } else if (value[0] == 0) {
 885                                 /* check if string begins with double comma
 886                                    since that would mean the password really
 887                                    does start with a comma, and would not
 888                                    indicate an empty string */
 889                                 if (value[1] != separator[0]) {
 890                                         vol->password = NULL;
 891                                         continue;
 892                                 }
 893                         }
 894                         temp_len = strlen(value);
 895                         /* removed password length check, NTLM passwords
 896                                 can be arbitrarily long */
 897
 898                         /* if comma in password, the string will be
 899                         prematurely null terminated.  Commas in password are
 900                         specified across the cifs mount interface by a double
 901                         comma ie ,, and a comma used as in other cases ie ','
 902                         as a parameter delimiter/separator is single and due
 903                         to the strsep above is temporarily zeroed. */
 904
 905                         /* NB: password legally can have multiple commas and
 906                         the only illegal character in a password is null */
 907
 908                         if ((value[temp_len] == 0) &&
 909                             (value[temp_len+1] == separator[0])) {
 910                                 /* reinsert comma */
 911                                 value[temp_len] = separator[0];
 912                                 temp_len += 2;  /* move after second comma */
 913                                 while (value[temp_len] != 0)  {
 914                                         if (value[temp_len] == separator[0]) {
 915                                                 if (value[temp_len+1] ==
 916                                                      separator[0]) {
 917                                                 /* skip second comma */
 918                                                         temp_len++;
 919                                                 } else {
 920                                                 /* single comma indicating start
 921                                                          of next parm */
 922                                                         break;
 923                                                 }
 924                                         }
 925                                         temp_len++;
 926                                 }
 927                                 if (value[temp_len] == 0) {
 928                                         options = NULL;
 929                                 } else {
 930                                         value[temp_len] = 0;
 931                                         /* point option to start of next parm */
 932                                         options = value + temp_len + 1;
 933                                 }
 934                                 /* go from value to value + temp_len condensing
 935                                 double commas to singles. Note that this ends up
 936                                 allocating a few bytes too many, which is ok */
 937                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 938                                 if (vol->password == NULL) {
 939                                         printk(KERN_WARNING "CIFS: no memory "
 940                                                             "for password\n");
 941                                         return 1;
 942                                 }
 943                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 944                                         vol->password[j] = value[i];
 945                                         if (value[i] == separator[0]
 946                                                 && value[i+1] == separator[0]) {
 947                                                 /* skip second comma */
 948                                                 i++;
 949                                         }
 950                                 }
 951                                 vol->password[j] = 0;
 952                         } else {
 953                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 954                                 if (vol->password == NULL) {
 955                                         printk(KERN_WARNING "CIFS: no memory "
 956                                                             "for password\n");
 957                                         return 1;
 958                                 }
 959                                 strcpy(vol->password, value);
 960                         }
 961                 } else if (strnicmp(data, "ip", 2) == 0) {
 962                         if (!value || !*value) {
 963                                 vol->UNCip = NULL;
 964                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 965                                                         INET6_ADDRSTRLEN) {
 966                                 vol->UNCip = value;
 967                         } else {
 968                                 printk(KERN_WARNING "CIFS: ip address "
 969                                                     "too long\n");
 970                                 return 1;
 971                         }
 972                 } else if (strnicmp(data, "sec", 3) == 0) {
 973                         if (!value || !*value) {
 974                                 cERROR(1, ("no security value specified"));
 975                                 continue;
 976                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 977                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 978                                         CIFSSEC_MUST_SIGN;
 979                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 980                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 981                                         CIFSSEC_MAY_KRB5; */
 982                                 cERROR(1, ("Krb5 cifs privacy not supported"));
 983                                 return 1;
 984                         } else if (strnicmp(value, "krb5", 4) == 0) {
 985                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 986 #ifdef CONFIG_CIFS_EXPERIMENTAL
 987                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 988                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 989                                         CIFSSEC_MUST_SIGN;
 990                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 991                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 992 #endif
 993                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 994                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 995                                         CIFSSEC_MUST_SIGN;
 996                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 997                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 998                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
 999                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
1000                                         CIFSSEC_MUST_SIGN;
1001                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1002                                 /* ntlm is default so can be turned off too */
1003                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1004                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1005                                 /* BB is there a better way to do this? */
1006                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1007 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1008                         } else if (strnicmp(value, "lanman", 6) == 0) {
1009                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1010 #endif
1011                         } else if (strnicmp(value, "none", 4) == 0) {
1012                                 vol->nullauth = 1;
1013                         } else {
1014                                 cERROR(1, ("bad security option: %s", value));
1015                                 return 1;
1016                         }
1017                 } else if ((strnicmp(data, "unc", 3) == 0)
1018                            || (strnicmp(data, "target", 6) == 0)
1019                            || (strnicmp(data, "path", 4) == 0)) {
1020                         if (!value || !*value) {
1021                                 printk(KERN_WARNING "CIFS: invalid path to "
1022                                                     "network resource\n");
1023                                 return 1;       /* needs_arg; */
1024                         }
1025                         if ((temp_len = strnlen(value, 300)) < 300) {
1026                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1027                                 if (vol->UNC == NULL)
1028                                         return 1;
1029                                 strcpy(vol->UNC, value);
1030                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1031                                         vol->UNC[0] = '\\';
1032                                         vol->UNC[1] = '\\';
1033                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1034                                         printk(KERN_WARNING
1035                                                "CIFS: UNC Path does not begin "
1036                                                "with // or \\\\ \n");
1037                                         return 1;
1038                                 }
1039                         } else {
1040                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1041                                 return 1;
1042                         }
1043                 } else if ((strnicmp(data, "domain", 3) == 0)
1044                            || (strnicmp(data, "workgroup", 5) == 0)) {
1045                         if (!value || !*value) {
1046                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1047                                 return 1;       /* needs_arg; */
1048                         }
1049                         /* BB are there cases in which a comma can be valid in
1050                         a domain name and need special handling? */
1051                         if (strnlen(value, 256) < 256) {
1052                                 vol->domainname = value;
1053                                 cFYI(1, ("Domain name set"));
1054                         } else {
1055                                 printk(KERN_WARNING "CIFS: domain name too "
1056                                                     "long\n");
1057                                 return 1;
1058                         }
1059                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1060                         if (!value || !*value) {
1061                                 printk(KERN_WARNING
1062                                         "CIFS: invalid path prefix\n");
1063                                 return 1;       /* needs_argument */
1064                         }
1065                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1066                                 if (value[0] != '/')
1067                                         temp_len++;  /* missing leading slash */
1068                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1069                                 if (vol->prepath == NULL)
1070                                         return 1;
1071                                 if (value[0] != '/') {
1072                                         vol->prepath[0] = '/';
1073                                         strcpy(vol->prepath+1, value);
1074                                 } else
1075                                         strcpy(vol->prepath, value);
1076                                 cFYI(1, ("prefix path %s", vol->prepath));
1077                         } else {
1078                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1079                                 return 1;
1080                         }
1081                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1082                         if (!value || !*value) {
1083                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1084                                                     "specified\n");
1085                                 return 1;       /* needs_arg; */
1086                         }
1087                         if (strnlen(value, 65) < 65) {
1088                                 if (strnicmp(value, "default", 7))
1089                                         vol->iocharset = value;
1090                                 /* if iocharset not set then load_nls_default
1091                                    is used by caller */
1092                                 cFYI(1, ("iocharset set to %s", value));
1093                         } else {
1094                                 printk(KERN_WARNING "CIFS: iocharset name "
1095                                                     "too long.\n");
1096                                 return 1;
1097                         }
1098                 } else if (strnicmp(data, "uid", 3) == 0) {
1099                         if (value && *value)
1100                                 vol->linux_uid =
1101                                         simple_strtoul(value, &value, 0);
1102                 } else if (strnicmp(data, "forceuid", 8) == 0) {
1103                                 vol->override_uid = 1;
1104                 } else if (strnicmp(data, "gid", 3) == 0) {
1105                         if (value && *value)
1106                                 vol->linux_gid =
1107                                         simple_strtoul(value, &value, 0);
1108                 } else if (strnicmp(data, "forcegid", 8) == 0) {
1109                                 vol->override_gid = 1;
1110                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1111                         if (value && *value) {
1112                                 vol->file_mode =
1113                                         simple_strtoul(value, &value, 0);
1114                         }
1115                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1116                         if (value && *value) {
1117                                 vol->dir_mode =
1118                                         simple_strtoul(value, &value, 0);
1119                         }
1120                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1121                         if (value && *value) {
1122                                 vol->dir_mode =
1123                                         simple_strtoul(value, &value, 0);
1124                         }
1125                 } else if (strnicmp(data, "port", 4) == 0) {
1126                         if (value && *value) {
1127                                 vol->port =
1128                                         simple_strtoul(value, &value, 0);
1129                         }
1130                 } else if (strnicmp(data, "rsize", 5) == 0) {
1131                         if (value && *value) {
1132                                 vol->rsize =
1133                                         simple_strtoul(value, &value, 0);
1134                         }
1135                 } else if (strnicmp(data, "wsize", 5) == 0) {
1136                         if (value && *value) {
1137                                 vol->wsize =
1138                                         simple_strtoul(value, &value, 0);
1139                         }
1140                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1141                         if (value && *value) {
1142                                 vol->sockopt =
1143                                         simple_strtoul(value, &value, 0);
1144                         }
1145                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1146                         if (!value || !*value || (*value == ' ')) {
1147                                 cFYI(1, ("invalid (empty) netbiosname"));
1148                         } else {
1149                                 memset(vol->source_rfc1001_name, 0x20, 15);
1150                                 for (i = 0; i < 15; i++) {
1151                                 /* BB are there cases in which a comma can be
1152                                 valid in this workstation netbios name (and need
1153                                 special handling)? */
1154
1155                                 /* We do not uppercase netbiosname for user */
1156                                         if (value[i] == 0)
1157                                                 break;
1158                                         else
1159                                                 vol->source_rfc1001_name[i] =
1160                                                                 value[i];
1161                                 }
1162                                 /* The string has 16th byte zero still from
1163                                 set at top of the function  */
1164                                 if ((i == 15) && (value[i] != 0))
1165                                         printk(KERN_WARNING "CIFS: netbiosname"
1166                                                 " longer than 15 truncated.\n");
1167                         }
1168                 } else if (strnicmp(data, "servern", 7) == 0) {
1169                         /* servernetbiosname specified override *SMBSERVER */
1170                         if (!value || !*value || (*value == ' ')) {
1171                                 cFYI(1, ("empty server netbiosname specified"));
1172                         } else {
1173                                 /* last byte, type, is 0x20 for servr type */
1174                                 memset(vol->target_rfc1001_name, 0x20, 16);
1175
1176                                 for (i = 0; i < 15; i++) {
1177                                 /* BB are there cases in which a comma can be
1178                                    valid in this workstation netbios name
1179                                    (and need special handling)? */
1180
1181                                 /* user or mount helper must uppercase
1182                                    the netbiosname */
1183                                         if (value[i] == 0)
1184                                                 break;
1185                                         else
1186                                                 vol->target_rfc1001_name[i] =
1187                                                                 value[i];
1188                                 }
1189                                 /* The string has 16th byte zero still from
1190                                    set at top of the function  */
1191                                 if ((i == 15) && (value[i] != 0))
1192                                         printk(KERN_WARNING "CIFS: server net"
1193                                         "biosname longer than 15 truncated.\n");
1194                         }
1195                 } else if (strnicmp(data, "credentials", 4) == 0) {
1196                         /* ignore */
1197                 } else if (strnicmp(data, "version", 3) == 0) {
1198                         /* ignore */
1199                 } else if (strnicmp(data, "guest", 5) == 0) {
1200                         /* ignore */
1201                 } else if (strnicmp(data, "rw", 2) == 0) {
1202                         vol->rw = true;
1203                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1204                         vol->noblocksnd = 1;
1205                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1206                         vol->noautotune = 1;
1207                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1208                                    (strnicmp(data, "nosuid", 6) == 0) ||
1209                                    (strnicmp(data, "exec", 4) == 0) ||
1210                                    (strnicmp(data, "noexec", 6) == 0) ||
1211                                    (strnicmp(data, "nodev", 5) == 0) ||
1212                                    (strnicmp(data, "noauto", 6) == 0) ||
1213                                    (strnicmp(data, "dev", 3) == 0)) {
1214                         /*  The mount tool or mount.cifs helper (if present)
1215                             uses these opts to set flags, and the flags are read
1216                             by the kernel vfs layer before we get here (ie
1217                             before read super) so there is no point trying to
1218                             parse these options again and set anything and it
1219                             is ok to just ignore them */
1220                         continue;
1221                 } else if (strnicmp(data, "ro", 2) == 0) {
1222                         vol->rw = false;
1223                 } else if (strnicmp(data, "hard", 4) == 0) {
1224                         vol->retry = 1;
1225                 } else if (strnicmp(data, "soft", 4) == 0) {
1226                         vol->retry = 0;
1227                 } else if (strnicmp(data, "perm", 4) == 0) {
1228                         vol->noperm = 0;
1229                 } else if (strnicmp(data, "noperm", 6) == 0) {
1230                         vol->noperm = 1;
1231                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1232                         vol->remap = 1;
1233                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1234                         vol->remap = 0;
1235                 } else if (strnicmp(data, "sfu", 3) == 0) {
1236                         vol->sfu_emul = 1;
1237                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1238                         vol->sfu_emul = 0;
1239                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1240                         vol->nodfs = 1;
1241                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1242                         vol->posix_paths = 1;
1243                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1244                         vol->posix_paths = 0;
1245                 } else if (strnicmp(data, "nounix", 6) == 0) {
1246                         vol->no_linux_ext = 1;
1247                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1248                         vol->no_linux_ext = 1;
1249                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1250                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1251                         vol->nocase = 1;
1252                 } else if (strnicmp(data, "brl", 3) == 0) {
1253                         vol->nobrl =  0;
1254                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1255                            (strnicmp(data, "nolock", 6) == 0)) {
1256                         vol->nobrl =  1;
1257                         /* turn off mandatory locking in mode
1258                         if remote locking is turned off since the
1259                         local vfs will do advisory */
1260                         if (vol->file_mode ==
1261                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1262                                 vol->file_mode = S_IALLUGO;
1263                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1264                         /* will take the shorter form "forcemand" as well */
1265                         /* This mount option will force use of mandatory
1266                           (DOS/Windows style) byte range locks, instead of
1267                           using posix advisory byte range locks, even if the
1268                           Unix extensions are available and posix locks would
1269                           be supported otherwise. If Unix extensions are not
1270                           negotiated this has no effect since mandatory locks
1271                           would be used (mandatory locks is all that those
1272                           those servers support) */
1273                         vol->mand_lock = 1;
1274                 } else if (strnicmp(data, "setuids", 7) == 0) {
1275                         vol->setuids = 1;
1276                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1277                         vol->setuids = 0;
1278                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1279                         vol->dynperm = true;
1280                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1281                         vol->dynperm = false;
1282                 } else if (strnicmp(data, "nohard", 6) == 0) {
1283                         vol->retry = 0;
1284                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1285                         vol->retry = 1;
1286                 } else if (strnicmp(data, "nointr", 6) == 0) {
1287                         vol->intr = 0;
1288                 } else if (strnicmp(data, "intr", 4) == 0) {
1289                         vol->intr = 1;
1290                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1291                         vol->nostrictsync = 1;
1292                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1293                         vol->nostrictsync = 0;
1294                 } else if (strnicmp(data, "serverino", 7) == 0) {
1295                         vol->server_ino = 1;
1296                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1297                         vol->server_ino = 0;
1298                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1299                         vol->cifs_acl = 1;
1300                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1301                         vol->cifs_acl = 0;
1302                 } else if (strnicmp(data, "acl", 3) == 0) {
1303                         vol->no_psx_acl = 0;
1304                 } else if (strnicmp(data, "noacl", 5) == 0) {
1305                         vol->no_psx_acl = 1;
1306 #ifdef CONFIG_CIFS_EXPERIMENTAL
1307                 } else if (strnicmp(data, "locallease", 6) == 0) {
1308                         vol->local_lease = 1;
1309 #endif
1310                 } else if (strnicmp(data, "sign", 4) == 0) {
1311                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1312                 } else if (strnicmp(data, "seal", 4) == 0) {
1313                         /* we do not do the following in secFlags because seal
1314                            is a per tree connection (mount) not a per socket
1315                            or per-smb connection option in the protocol */
1316                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1317                         vol->seal = 1;
1318                 } else if (strnicmp(data, "direct", 6) == 0) {
1319                         vol->direct_io = 1;
1320                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1321                         vol->direct_io = 1;
1322                 } else if (strnicmp(data, "in6_addr", 8) == 0) {
1323                         if (!value || !*value) {
1324                                 vol->in6_addr = NULL;
1325                         } else if (strnlen(value, 49) == 48) {
1326                                 vol->in6_addr = value;
1327                         } else {
1328                                 printk(KERN_WARNING "CIFS: ip v6 address not "
1329                                                     "48 characters long\n");
1330                                 return 1;
1331                         }
1332                 } else if (strnicmp(data, "noac", 4) == 0) {
1333                         printk(KERN_WARNING "CIFS: Mount option noac not "
1334                                 "supported. Instead set "
1335                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1336                 } else
1337                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1338                                                 data);
1339         }
1340         if (vol->UNC == NULL) {
1341                 if (devname == NULL) {
1342                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1343                                                 "target\n");
1344                         return 1;
1345                 }
1346                 if ((temp_len = strnlen(devname, 300)) < 300) {
1347                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1348                         if (vol->UNC == NULL)
1349                                 return 1;
1350                         strcpy(vol->UNC, devname);
1351                         if (strncmp(vol->UNC, "//", 2) == 0) {
1352                                 vol->UNC[0] = '\\';
1353                                 vol->UNC[1] = '\\';
1354                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1355                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1356                                                     "begin with // or \\\\ \n");
1357                                 return 1;
1358                         }
1359                         value = strpbrk(vol->UNC+2, "/\\");
1360                         if (value)
1361                                 *value = '\\';
1362                 } else {
1363                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1364                         return 1;
1365                 }
1366         }
1367         if (vol->UNCip == NULL)
1368                 vol->UNCip = &vol->UNC[2];
1369
1370         return 0;
1371 }
1372
1373 static struct TCP_Server_Info *
1374 cifs_find_tcp_session(struct sockaddr_storage *addr)
1375 {
1376         struct list_head *tmp;
1377         struct TCP_Server_Info *server;
1378         struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1379         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1380
1381         write_lock(&cifs_tcp_ses_lock);
1382         list_for_each(tmp, &cifs_tcp_ses_list) {
1383                 server = list_entry(tmp, struct TCP_Server_Info,
1384                                     tcp_ses_list);
1385                 /*
1386                  * the demux thread can exit on its own while still in CifsNew
1387                  * so don't accept any sockets in that state. Since the
1388                  * tcpStatus never changes back to CifsNew it's safe to check
1389                  * for this without a lock.
1390                  */
1391                 if (server->tcpStatus == CifsNew)
1392                         continue;
1393
1394                 if (addr->ss_family == AF_INET &&
1395                     (addr4->sin_addr.s_addr !=
1396                      server->addr.sockAddr.sin_addr.s_addr))
1397                         continue;
1398                 else if (addr->ss_family == AF_INET6 &&
1399                          !ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1400                                           &addr6->sin6_addr))
1401                         continue;
1402
1403                 ++server->srv_count;
1404                 write_unlock(&cifs_tcp_ses_lock);
1405                 cFYI(1, ("Existing tcp session with server found"));
1406                 return server;
1407         }
1408         write_unlock(&cifs_tcp_ses_lock);
1409         return NULL;
1410 }
1411
1412 static void
1413 cifs_put_tcp_session(struct TCP_Server_Info *server)
1414 {
1415         struct task_struct *task;
1416
1417         write_lock(&cifs_tcp_ses_lock);
1418         if (--server->srv_count > 0) {
1419                 write_unlock(&cifs_tcp_ses_lock);
1420                 return;
1421         }
1422
1423         list_del_init(&server->tcp_ses_list);
1424         write_unlock(&cifs_tcp_ses_lock);
1425
1426         spin_lock(&GlobalMid_Lock);
1427         server->tcpStatus = CifsExiting;
1428         spin_unlock(&GlobalMid_Lock);
1429
1430         task = xchg(&server->tsk, NULL);
1431         if (task)
1432                 force_sig(SIGKILL, task);
1433 }
1434
1435 static struct TCP_Server_Info *
1436 cifs_get_tcp_session(struct smb_vol *volume_info)
1437 {
1438         struct TCP_Server_Info *tcp_ses = NULL;
1439         struct sockaddr_storage addr;
1440         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1441         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1442         int rc;
1443
1444         memset(&addr, 0, sizeof(struct sockaddr_storage));
1445
1446         if (volume_info->UNCip && volume_info->UNC) {
1447                 rc = cifs_inet_pton(AF_INET, volume_info->UNCip,
1448                                     &sin_server->sin_addr.s_addr);
1449
1450                 if (rc <= 0) {
1451                         /* not ipv4 address, try ipv6 */
1452                         rc = cifs_inet_pton(AF_INET6, volume_info->UNCip,
1453                                             &sin_server6->sin6_addr.in6_u);
1454                         if (rc > 0)
1455                                 addr.ss_family = AF_INET6;
1456                 } else {
1457                         addr.ss_family = AF_INET;
1458                 }
1459
1460                 if (rc <= 0) {
1461                         /* we failed translating address */
1462                         rc = -EINVAL;
1463                         goto out_err;
1464                 }
1465
1466                 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC,
1467                          volume_info->UNCip));
1468         } else if (volume_info->UNCip) {
1469                 /* BB using ip addr as tcp_ses name to connect to the
1470                    DFS root below */
1471                 cERROR(1, ("Connecting to DFS root not implemented yet"));
1472                 rc = -EINVAL;
1473                 goto out_err;
1474         } else /* which tcp_sess DFS root would we conect to */ {
1475                 cERROR(1,
1476                        ("CIFS mount error: No UNC path (e.g. -o "
1477                         "unc=//192.168.1.100/public) specified"));
1478                 rc = -EINVAL;
1479                 goto out_err;
1480         }
1481
1482         /* see if we already have a matching tcp_ses */
1483         tcp_ses = cifs_find_tcp_session(&addr);
1484         if (tcp_ses)
1485                 return tcp_ses;
1486
1487         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1488         if (!tcp_ses) {
1489                 rc = -ENOMEM;
1490                 goto out_err;
1491         }
1492
1493         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1494         if (IS_ERR(tcp_ses->hostname)) {
1495                 rc = PTR_ERR(tcp_ses->hostname);
1496                 goto out_err;
1497         }
1498
1499         tcp_ses->noblocksnd = volume_info->noblocksnd;
1500         tcp_ses->noautotune = volume_info->noautotune;
1501         atomic_set(&tcp_ses->inFlight, 0);
1502         init_waitqueue_head(&tcp_ses->response_q);
1503         init_waitqueue_head(&tcp_ses->request_q);
1504         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1505         mutex_init(&tcp_ses->srv_mutex);
1506         memcpy(tcp_ses->workstation_RFC1001_name,
1507                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1508         memcpy(tcp_ses->server_RFC1001_name,
1509                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1510         tcp_ses->sequence_number = 0;
1511         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1512         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1513
1514         /*
1515          * at this point we are the only ones with the pointer
1516          * to the struct since the kernel thread not created yet
1517          * no need to spinlock this init of tcpStatus or srv_count
1518          */
1519         tcp_ses->tcpStatus = CifsNew;
1520         ++tcp_ses->srv_count;
1521
1522         if (addr.ss_family == AF_INET6) {
1523                 cFYI(1, ("attempting ipv6 connect"));
1524                 /* BB should we allow ipv6 on port 139? */
1525                 /* other OS never observed in Wild doing 139 with v6 */
1526                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1527                         sizeof(struct sockaddr_in6));
1528                 sin_server6->sin6_port = htons(volume_info->port);
1529                 rc = ipv6_connect(tcp_ses);
1530         } else {
1531                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1532                         sizeof(struct sockaddr_in));
1533                 sin_server->sin_port = htons(volume_info->port);
1534                 rc = ipv4_connect(tcp_ses);
1535         }
1536         if (rc < 0) {
1537                 cERROR(1, ("Error connecting to socket. Aborting operation"));
1538                 goto out_err;
1539         }
1540
1541         /*
1542          * since we're in a cifs function already, we know that
1543          * this will succeed. No need for try_module_get().
1544          */
1545         __module_get(THIS_MODULE);
1546         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1547                                   tcp_ses, "cifsd");
1548         if (IS_ERR(tcp_ses->tsk)) {
1549                 rc = PTR_ERR(tcp_ses->tsk);
1550                 cERROR(1, ("error %d create cifsd thread", rc));
1551                 module_put(THIS_MODULE);
1552                 goto out_err;
1553         }
1554
1555         /* thread spawned, put it on the list */
1556         write_lock(&cifs_tcp_ses_lock);
1557         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1558         write_unlock(&cifs_tcp_ses_lock);
1559
1560         return tcp_ses;
1561
1562 out_err:
1563         if (tcp_ses) {
1564                 kfree(tcp_ses->hostname);
1565                 if (tcp_ses->ssocket)
1566                         sock_release(tcp_ses->ssocket);
1567                 kfree(tcp_ses);
1568         }
1569         return ERR_PTR(rc);
1570 }
1571
1572 static struct cifsSesInfo *
1573 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1574 {
1575         struct list_head *tmp;
1576         struct cifsSesInfo *ses;
1577
1578         write_lock(&cifs_tcp_ses_lock);
1579         list_for_each(tmp, &server->smb_ses_list) {
1580                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1581                 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1582                         continue;
1583
1584                 ++ses->ses_count;
1585                 write_unlock(&cifs_tcp_ses_lock);
1586                 return ses;
1587         }
1588         write_unlock(&cifs_tcp_ses_lock);
1589         return NULL;
1590 }
1591
1592 static void
1593 cifs_put_smb_ses(struct cifsSesInfo *ses)
1594 {
1595         int xid;
1596         struct TCP_Server_Info *server = ses->server;
1597
1598         write_lock(&cifs_tcp_ses_lock);
1599         if (--ses->ses_count > 0) {
1600                 write_unlock(&cifs_tcp_ses_lock);
1601                 return;
1602         }
1603
1604         list_del_init(&ses->smb_ses_list);
1605         write_unlock(&cifs_tcp_ses_lock);
1606
1607         if (ses->status == CifsGood) {
1608                 xid = GetXid();
1609                 CIFSSMBLogoff(xid, ses);
1610                 _FreeXid(xid);
1611         }
1612         sesInfoFree(ses);
1613         cifs_put_tcp_session(server);
1614 }
1615
1616 static struct cifsTconInfo *
1617 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1618 {
1619         struct list_head *tmp;
1620         struct cifsTconInfo *tcon;
1621
1622         write_lock(&cifs_tcp_ses_lock);
1623         list_for_each(tmp, &ses->tcon_list) {
1624                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1625                 if (tcon->tidStatus == CifsExiting)
1626                         continue;
1627                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1628                         continue;
1629
1630                 ++tcon->tc_count;
1631                 write_unlock(&cifs_tcp_ses_lock);
1632                 return tcon;
1633         }
1634         write_unlock(&cifs_tcp_ses_lock);
1635         return NULL;
1636 }
1637
1638 static void
1639 cifs_put_tcon(struct cifsTconInfo *tcon)
1640 {
1641         int xid;
1642         struct cifsSesInfo *ses = tcon->ses;
1643
1644         write_lock(&cifs_tcp_ses_lock);
1645         if (--tcon->tc_count > 0) {
1646                 write_unlock(&cifs_tcp_ses_lock);
1647                 return;
1648         }
1649
1650         list_del_init(&tcon->tcon_list);
1651         write_unlock(&cifs_tcp_ses_lock);
1652
1653         xid = GetXid();
1654         CIFSSMBTDis(xid, tcon);
1655         _FreeXid(xid);
1656
1657         DeleteTconOplockQEntries(tcon);
1658         tconInfoFree(tcon);
1659         cifs_put_smb_ses(ses);
1660 }
1661
1662 int
1663 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1664              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1665              struct dfs_info3_param **preferrals, int remap)
1666 {
1667         char *temp_unc;
1668         int rc = 0;
1669
1670         *pnum_referrals = 0;
1671         *preferrals = NULL;
1672
1673         if (pSesInfo->ipc_tid == 0) {
1674                 temp_unc = kmalloc(2 /* for slashes */ +
1675                         strnlen(pSesInfo->serverName,
1676                                 SERVER_NAME_LEN_WITH_NULL * 2)
1677                                  + 1 + 4 /* slash IPC$ */  + 2,
1678                                 GFP_KERNEL);
1679                 if (temp_unc == NULL)
1680                         return -ENOMEM;
1681                 temp_unc[0] = '\\';
1682                 temp_unc[1] = '\\';
1683                 strcpy(temp_unc + 2, pSesInfo->serverName);
1684                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1685                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1686                 cFYI(1,
1687                      ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1688                 kfree(temp_unc);
1689         }
1690         if (rc == 0)
1691                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1692                                      pnum_referrals, nls_codepage, remap);
1693         /* BB map targetUNCs to dfs_info3 structures, here or
1694                 in CIFSGetDFSRefer BB */
1695
1696         return rc;
1697 }
1698
1699 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1700 static struct lock_class_key cifs_key[2];
1701 static struct lock_class_key cifs_slock_key[2];
1702
1703 static inline void
1704 cifs_reclassify_socket4(struct socket *sock)
1705 {
1706         struct sock *sk = sock->sk;
1707         BUG_ON(sock_owned_by_user(sk));
1708         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1709                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1710 }
1711
1712 static inline void
1713 cifs_reclassify_socket6(struct socket *sock)
1714 {
1715         struct sock *sk = sock->sk;
1716         BUG_ON(sock_owned_by_user(sk));
1717         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1718                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1719 }
1720 #else
1721 static inline void
1722 cifs_reclassify_socket4(struct socket *sock)
1723 {
1724 }
1725
1726 static inline void
1727 cifs_reclassify_socket6(struct socket *sock)
1728 {
1729 }
1730 #endif
1731
1732 /* See RFC1001 section 14 on representation of Netbios names */
1733 static void rfc1002mangle(char *target, char *source, unsigned int length)
1734 {
1735         unsigned int i, j;
1736
1737         for (i = 0, j = 0; i < (length); i++) {
1738                 /* mask a nibble at a time and encode */
1739                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1740                 target[j+1] = 'A' + (0x0F & source[i]);
1741                 j += 2;
1742         }
1743
1744 }
1745
1746
1747 static int
1748 ipv4_connect(struct TCP_Server_Info *server)
1749 {
1750         int rc = 0;
1751         bool connected = false;
1752         __be16 orig_port = 0;
1753         struct socket *socket = server->ssocket;
1754
1755         if (socket == NULL) {
1756                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1757                                       IPPROTO_TCP, &socket);
1758                 if (rc < 0) {
1759                         cERROR(1, ("Error %d creating socket", rc));
1760                         return rc;
1761                 }
1762
1763                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1764                 cFYI(1, ("Socket created"));
1765                 server->ssocket = socket;
1766                 socket->sk->sk_allocation = GFP_NOFS;
1767                 cifs_reclassify_socket4(socket);
1768         }
1769
1770         /* user overrode default port */
1771         if (server->addr.sockAddr.sin_port) {
1772                 rc = socket->ops->connect(socket, (struct sockaddr *)
1773                                           &server->addr.sockAddr,
1774                                           sizeof(struct sockaddr_in), 0);
1775                 if (rc >= 0)
1776                         connected = true;
1777         }
1778
1779         if (!connected) {
1780                 /* save original port so we can retry user specified port
1781                         later if fall back ports fail this time  */
1782                 orig_port = server->addr.sockAddr.sin_port;
1783
1784                 /* do not retry on the same port we just failed on */
1785                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1786                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1787                         rc = socket->ops->connect(socket,
1788                                                 (struct sockaddr *)
1789                                                 &server->addr.sockAddr,
1790                                                 sizeof(struct sockaddr_in), 0);
1791                         if (rc >= 0)
1792                                 connected = true;
1793                 }
1794         }
1795         if (!connected) {
1796                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1797                 rc = socket->ops->connect(socket, (struct sockaddr *)
1798                                               &server->addr.sockAddr,
1799                                               sizeof(struct sockaddr_in), 0);
1800                 if (rc >= 0)
1801                         connected = true;
1802         }
1803
1804         /* give up here - unless we want to retry on different
1805                 protocol families some day */
1806         if (!connected) {
1807                 if (orig_port)
1808                         server->addr.sockAddr.sin_port = orig_port;
1809                 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1810                 sock_release(socket);
1811                 server->ssocket = NULL;
1812                 return rc;
1813         }
1814
1815
1816         /*
1817          * Eventually check for other socket options to change from
1818          *  the default. sock_setsockopt not used because it expects
1819          *  user space buffer
1820          */
1821         socket->sk->sk_rcvtimeo = 7 * HZ;
1822         socket->sk->sk_sndtimeo = 5 * HZ;
1823
1824         /* make the bufsizes depend on wsize/rsize and max requests */
1825         if (server->noautotune) {
1826                 if (socket->sk->sk_sndbuf < (200 * 1024))
1827                         socket->sk->sk_sndbuf = 200 * 1024;
1828                 if (socket->sk->sk_rcvbuf < (140 * 1024))
1829                         socket->sk->sk_rcvbuf = 140 * 1024;
1830         }
1831
1832          cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1833                  socket->sk->sk_sndbuf,
1834                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1835
1836         /* send RFC1001 sessinit */
1837         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1838                 /* some servers require RFC1001 sessinit before sending
1839                 negprot - BB check reconnection in case where second
1840                 sessinit is sent but no second negprot */
1841                 struct rfc1002_session_packet *ses_init_buf;
1842                 struct smb_hdr *smb_buf;
1843                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1844                                        GFP_KERNEL);
1845                 if (ses_init_buf) {
1846                         ses_init_buf->trailer.session_req.called_len = 32;
1847                         if (server->server_RFC1001_name &&
1848                             server->server_RFC1001_name[0] != 0)
1849                                 rfc1002mangle(ses_init_buf->trailer.
1850                                                 session_req.called_name,
1851                                               server->server_RFC1001_name,
1852                                               RFC1001_NAME_LEN_WITH_NULL);
1853                         else
1854                                 rfc1002mangle(ses_init_buf->trailer.
1855                                                 session_req.called_name,
1856                                               DEFAULT_CIFS_CALLED_NAME,
1857                                               RFC1001_NAME_LEN_WITH_NULL);
1858
1859                         ses_init_buf->trailer.session_req.calling_len = 32;
1860
1861                         /* calling name ends in null (byte 16) from old smb
1862                         convention. */
1863                         if (server->workstation_RFC1001_name &&
1864                             server->workstation_RFC1001_name[0] != 0)
1865                                 rfc1002mangle(ses_init_buf->trailer.
1866                                                 session_req.calling_name,
1867                                               server->workstation_RFC1001_name,
1868                                               RFC1001_NAME_LEN_WITH_NULL);
1869                         else
1870                                 rfc1002mangle(ses_init_buf->trailer.
1871                                                 session_req.calling_name,
1872                                               "LINUX_CIFS_CLNT",
1873                                               RFC1001_NAME_LEN_WITH_NULL);
1874
1875                         ses_init_buf->trailer.session_req.scope1 = 0;
1876                         ses_init_buf->trailer.session_req.scope2 = 0;
1877                         smb_buf = (struct smb_hdr *)ses_init_buf;
1878                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1879                         smb_buf->smb_buf_length = 0x81000044;
1880                         rc = smb_send(server, smb_buf, 0x44);
1881                         kfree(ses_init_buf);
1882                         msleep(1); /* RFC1001 layer in at least one server
1883                                       requires very short break before negprot
1884                                       presumably because not expecting negprot
1885                                       to follow so fast.  This is a simple
1886                                       solution that works without
1887                                       complicating the code and causes no
1888                                       significant slowing down on mount
1889                                       for everyone else */
1890                 }
1891                 /* else the negprot may still work without this
1892                 even though malloc failed */
1893
1894         }
1895
1896         return rc;
1897 }
1898
1899 static int
1900 ipv6_connect(struct TCP_Server_Info *server)
1901 {
1902         int rc = 0;
1903         bool connected = false;
1904         __be16 orig_port = 0;
1905         struct socket *socket = server->ssocket;
1906
1907         if (socket == NULL) {
1908                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1909                                       IPPROTO_TCP, &socket);
1910                 if (rc < 0) {
1911                         cERROR(1, ("Error %d creating ipv6 socket", rc));
1912                         socket = NULL;
1913                         return rc;
1914                 }
1915
1916                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1917                 cFYI(1, ("ipv6 Socket created"));
1918                 server->ssocket = socket;
1919                 socket->sk->sk_allocation = GFP_NOFS;
1920                 cifs_reclassify_socket6(socket);
1921         }
1922
1923         /* user overrode default port */
1924         if (server->addr.sockAddr6.sin6_port) {
1925                 rc = socket->ops->connect(socket,
1926                                 (struct sockaddr *) &server->addr.sockAddr6,
1927                                 sizeof(struct sockaddr_in6), 0);
1928                 if (rc >= 0)
1929                         connected = true;
1930         }
1931
1932         if (!connected) {
1933                 /* save original port so we can retry user specified port
1934                         later if fall back ports fail this time  */
1935
1936                 orig_port = server->addr.sockAddr6.sin6_port;
1937                 /* do not retry on the same port we just failed on */
1938                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1939                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1940                         rc = socket->ops->connect(socket, (struct sockaddr *)
1941                                         &server->addr.sockAddr6,
1942                                         sizeof(struct sockaddr_in6), 0);
1943                         if (rc >= 0)
1944                                 connected = true;
1945                 }
1946         }
1947         if (!connected) {
1948                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1949                 rc = socket->ops->connect(socket, (struct sockaddr *)
1950                                 &server->addr.sockAddr6,
1951                                 sizeof(struct sockaddr_in6), 0);
1952                 if (rc >= 0)
1953                         connected = true;
1954         }
1955
1956         /* give up here - unless we want to retry on different
1957                 protocol families some day */
1958         if (!connected) {
1959                 if (orig_port)
1960                         server->addr.sockAddr6.sin6_port = orig_port;
1961                 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1962                 sock_release(socket);
1963                 server->ssocket = NULL;
1964                 return rc;
1965         }
1966
1967         /*
1968          * Eventually check for other socket options to change from
1969          * the default. sock_setsockopt not used because it expects
1970          * user space buffer
1971          */
1972         socket->sk->sk_rcvtimeo = 7 * HZ;
1973         socket->sk->sk_sndtimeo = 5 * HZ;
1974         server->ssocket = socket;
1975
1976         return rc;
1977 }
1978
1979 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1980                           struct super_block *sb, struct smb_vol *vol_info)
1981 {
1982         /* if we are reconnecting then should we check to see if
1983          * any requested capabilities changed locally e.g. via
1984          * remount but we can not do much about it here
1985          * if they have (even if we could detect it by the following)
1986          * Perhaps we could add a backpointer to array of sb from tcon
1987          * or if we change to make all sb to same share the same
1988          * sb as NFS - then we only have one backpointer to sb.
1989          * What if we wanted to mount the server share twice once with
1990          * and once without posixacls or posix paths? */
1991         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1992
1993         if (vol_info && vol_info->no_linux_ext) {
1994                 tcon->fsUnixInfo.Capability = 0;
1995                 tcon->unix_ext = 0; /* Unix Extensions disabled */
1996                 cFYI(1, ("Linux protocol extensions disabled"));
1997                 return;
1998         } else if (vol_info)
1999                 tcon->unix_ext = 1; /* Unix Extensions supported */
2000
2001         if (tcon->unix_ext == 0) {
2002                 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
2003                 return;
2004         }
2005
2006         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2007                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2008
2009                 /* check for reconnect case in which we do not
2010                    want to change the mount behavior if we can avoid it */
2011                 if (vol_info == NULL) {
2012                         /* turn off POSIX ACL and PATHNAMES if not set
2013                            originally at mount time */
2014                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2015                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2016                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2017                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2018                                         cERROR(1, ("POSIXPATH support change"));
2019                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2020                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2021                                 cERROR(1, ("possible reconnect error"));
2022                                 cERROR(1,
2023                                         ("server disabled POSIX path support"));
2024                         }
2025                 }
2026
2027                 cap &= CIFS_UNIX_CAP_MASK;
2028                 if (vol_info && vol_info->no_psx_acl)
2029                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2030                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2031                         cFYI(1, ("negotiated posix acl support"));
2032                         if (sb)
2033                                 sb->s_flags |= MS_POSIXACL;
2034                 }
2035
2036                 if (vol_info && vol_info->posix_paths == 0)
2037                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2038                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2039                         cFYI(1, ("negotiate posix pathnames"));
2040                         if (sb)
2041                                 CIFS_SB(sb)->mnt_cifs_flags |=
2042                                         CIFS_MOUNT_POSIX_PATHS;
2043                 }
2044
2045                 /* We might be setting the path sep back to a different
2046                 form if we are reconnecting and the server switched its
2047                 posix path capability for this share */
2048                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2049                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2050
2051                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2052                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2053                                 CIFS_SB(sb)->rsize = 127 * 1024;
2054                                 cFYI(DBG2,
2055                                         ("larger reads not supported by srv"));
2056                         }
2057                 }
2058
2059
2060                 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2061 #ifdef CONFIG_CIFS_DEBUG2
2062                 if (cap & CIFS_UNIX_FCNTL_CAP)
2063                         cFYI(1, ("FCNTL cap"));
2064                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2065                         cFYI(1, ("EXTATTR cap"));
2066                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2067                         cFYI(1, ("POSIX path cap"));
2068                 if (cap & CIFS_UNIX_XATTR_CAP)
2069                         cFYI(1, ("XATTR cap"));
2070                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2071                         cFYI(1, ("POSIX ACL cap"));
2072                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2073                         cFYI(1, ("very large read cap"));
2074                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2075                         cFYI(1, ("very large write cap"));
2076 #endif /* CIFS_DEBUG2 */
2077                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2078                         if (vol_info == NULL) {
2079                                 cFYI(1, ("resetting capabilities failed"));
2080                         } else
2081                                 cERROR(1, ("Negotiating Unix capabilities "
2082                                            "with the server failed.  Consider "
2083                                            "mounting with the Unix Extensions\n"
2084                                            "disabled, if problems are found, "
2085                                            "by specifying the nounix mount "
2086                                            "option."));
2087
2088                 }
2089         }
2090 }
2091
2092 static void
2093 convert_delimiter(char *path, char delim)
2094 {
2095         int i;
2096         char old_delim;
2097
2098         if (path == NULL)
2099                 return;
2100
2101         if (delim == '/')
2102                 old_delim = '\\';
2103         else
2104                 old_delim = '/';
2105
2106         for (i = 0; path[i] != '\0'; i++) {
2107                 if (path[i] == old_delim)
2108                         path[i] = delim;
2109         }
2110 }
2111
2112 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2113                           struct cifs_sb_info *cifs_sb)
2114 {
2115         if (pvolume_info->rsize > CIFSMaxBufSize) {
2116                 cERROR(1, ("rsize %d too large, using MaxBufSize",
2117                         pvolume_info->rsize));
2118                 cifs_sb->rsize = CIFSMaxBufSize;
2119         } else if ((pvolume_info->rsize) &&
2120                         (pvolume_info->rsize <= CIFSMaxBufSize))
2121                 cifs_sb->rsize = pvolume_info->rsize;
2122         else /* default */
2123                 cifs_sb->rsize = CIFSMaxBufSize;
2124
2125         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2126                 cERROR(1, ("wsize %d too large, using 4096 instead",
2127                           pvolume_info->wsize));
2128                 cifs_sb->wsize = 4096;
2129         } else if (pvolume_info->wsize)
2130                 cifs_sb->wsize = pvolume_info->wsize;
2131         else
2132                 cifs_sb->wsize = min_t(const int,
2133                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2134                                         127*1024);
2135                 /* old default of CIFSMaxBufSize was too small now
2136                    that SMB Write2 can send multiple pages in kvec.
2137                    RFC1001 does not describe what happens when frame
2138                    bigger than 128K is sent so use that as max in
2139                    conjunction with 52K kvec constraint on arch with 4K
2140                    page size  */
2141
2142         if (cifs_sb->rsize < 2048) {
2143                 cifs_sb->rsize = 2048;
2144                 /* Windows ME may prefer this */
2145                 cFYI(1, ("readsize set to minimum: 2048"));
2146         }
2147         /* calculate prepath */
2148         cifs_sb->prepath = pvolume_info->prepath;
2149         if (cifs_sb->prepath) {
2150                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2151                 /* we can not convert the / to \ in the path
2152                 separators in the prefixpath yet because we do not
2153                 know (until reset_cifs_unix_caps is called later)
2154                 whether POSIX PATH CAP is available. We normalize
2155                 the / to \ after reset_cifs_unix_caps is called */
2156                 pvolume_info->prepath = NULL;
2157         } else
2158                 cifs_sb->prepathlen = 0;
2159         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2160         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2161         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2162         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2163         cFYI(1, ("file mode: 0x%x  dir mode: 0x%x",
2164                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2165
2166         if (pvolume_info->noperm)
2167                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2168         if (pvolume_info->setuids)
2169                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2170         if (pvolume_info->server_ino)
2171                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2172         if (pvolume_info->remap)
2173                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2174         if (pvolume_info->no_xattr)
2175                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2176         if (pvolume_info->sfu_emul)
2177                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2178         if (pvolume_info->nobrl)
2179                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2180         if (pvolume_info->nostrictsync)
2181                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2182         if (pvolume_info->mand_lock)
2183                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2184         if (pvolume_info->cifs_acl)
2185                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2186         if (pvolume_info->override_uid)
2187                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2188         if (pvolume_info->override_gid)
2189                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2190         if (pvolume_info->dynperm)
2191                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2192         if (pvolume_info->direct_io) {
2193                 cFYI(1, ("mounting share using direct i/o"));
2194                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2195         }
2196
2197         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2198                 cERROR(1, ("mount option dynperm ignored if cifsacl "
2199                            "mount option supported"));
2200 }
2201
2202 static int
2203 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2204                    struct cifs_sb_info *cifs_sb, const char *full_path)
2205 {
2206         int rc;
2207         __u64 inode_num;
2208         FILE_ALL_INFO *pfile_info;
2209
2210         rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2211                                    cifs_sb->local_nls,
2212                                    cifs_sb->mnt_cifs_flags &
2213                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2214         if (rc != -EOPNOTSUPP)
2215                 return rc;
2216
2217         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2218         if (pfile_info == NULL)
2219                 return -ENOMEM;
2220
2221         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2222                               0 /* not legacy */, cifs_sb->local_nls,
2223                               cifs_sb->mnt_cifs_flags &
2224                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2225         kfree(pfile_info);
2226         return rc;
2227 }
2228
2229 static void
2230 cleanup_volume_info(struct smb_vol **pvolume_info)
2231 {
2232         struct smb_vol *volume_info;
2233
2234         if (!pvolume_info && !*pvolume_info)
2235                 return;
2236
2237         volume_info = *pvolume_info;
2238         kzfree(volume_info->password);
2239         kfree(volume_info->UNC);
2240         kfree(volume_info->prepath);
2241         kfree(volume_info);
2242         *pvolume_info = NULL;
2243         return;
2244 }
2245
2246 #ifdef CONFIG_CIFS_DFS_UPCALL
2247 /* build_path_to_root returns full path to root when
2248  * we do not have an exiting connection (tcon) */
2249 static char *
2250 build_unc_path_to_root(const struct smb_vol *volume_info,
2251                 const struct cifs_sb_info *cifs_sb)
2252 {
2253         char *full_path;
2254
2255         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2256         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2257         if (full_path == NULL)
2258                 return ERR_PTR(-ENOMEM);
2259
2260         strncpy(full_path, volume_info->UNC, unc_len);
2261         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2262                 int i;
2263                 for (i = 0; i < unc_len; i++) {
2264                         if (full_path[i] == '\\')
2265                                 full_path[i] = '/';
2266                 }
2267         }
2268
2269         if (cifs_sb->prepathlen)
2270                 strncpy(full_path + unc_len, cifs_sb->prepath,
2271                                 cifs_sb->prepathlen);
2272
2273         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2274         return full_path;
2275 }
2276 #endif
2277
2278 int
2279 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2280                 char *mount_data_global, const char *devname)
2281 {
2282         int rc = 0;
2283         int xid;
2284         struct smb_vol *volume_info;
2285         struct cifsSesInfo *pSesInfo = NULL;
2286         struct cifsTconInfo *tcon = NULL;
2287         struct TCP_Server_Info *srvTcp = NULL;
2288         char   *full_path;
2289         char *mount_data = mount_data_global;
2290 #ifdef CONFIG_CIFS_DFS_UPCALL
2291         struct dfs_info3_param *referrals = NULL;
2292         unsigned int num_referrals = 0;
2293         int referral_walks_count = 0;
2294 try_mount_again:
2295 #endif
2296         full_path = NULL;
2297
2298         xid = GetXid();
2299
2300         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2301         if (!volume_info) {
2302                 rc = -ENOMEM;
2303                 goto out;
2304         }
2305
2306         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2307                 rc = -EINVAL;
2308                 goto out;
2309         }
2310
2311         if (volume_info->nullauth) {
2312                 cFYI(1, ("null user"));
2313                 volume_info->username = "";
2314         } else if (volume_info->username) {
2315                 /* BB fixme parse for domain name here */
2316                 cFYI(1, ("Username: %s", volume_info->username));
2317         } else {
2318                 cifserror("No username specified");
2319         /* In userspace mount helper we can get user name from alternate
2320            locations such as env variables and files on disk */
2321                 rc = -EINVAL;
2322                 goto out;
2323         }
2324
2325
2326         /* this is needed for ASCII cp to Unicode converts */
2327         if (volume_info->iocharset == NULL) {
2328                 cifs_sb->local_nls = load_nls_default();
2329         /* load_nls_default can not return null */
2330         } else {
2331                 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2332                 if (cifs_sb->local_nls == NULL) {
2333                         cERROR(1, ("CIFS mount error: iocharset %s not found",
2334                                  volume_info->iocharset));
2335                         rc = -ELIBACC;
2336                         goto out;
2337                 }
2338         }
2339
2340         /* get a reference to a tcp session */
2341         srvTcp = cifs_get_tcp_session(volume_info);
2342         if (IS_ERR(srvTcp)) {
2343                 rc = PTR_ERR(srvTcp);
2344                 goto out;
2345         }
2346
2347         pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2348         if (pSesInfo) {
2349                 cFYI(1, ("Existing smb sess found (status=%d)",
2350                         pSesInfo->status));
2351                 /*
2352                  * The existing SMB session already has a reference to srvTcp,
2353                  * so we can put back the extra one we got before
2354                  */
2355                 cifs_put_tcp_session(srvTcp);
2356
2357                 down(&pSesInfo->sesSem);
2358                 if (pSesInfo->need_reconnect) {
2359                         cFYI(1, ("Session needs reconnect"));
2360                         rc = cifs_setup_session(xid, pSesInfo,
2361                                                 cifs_sb->local_nls);
2362                 }
2363                 up(&pSesInfo->sesSem);
2364         } else if (!rc) {
2365                 cFYI(1, ("Existing smb sess not found"));
2366                 pSesInfo = sesInfoAlloc();
2367                 if (pSesInfo == NULL) {
2368                         rc = -ENOMEM;
2369                         goto mount_fail_check;
2370                 }
2371
2372                 /* new SMB session uses our srvTcp ref */
2373                 pSesInfo->server = srvTcp;
2374                 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2375                         sprintf(pSesInfo->serverName, "%pI6",
2376                                 &srvTcp->addr.sockAddr6.sin6_addr);
2377                 else
2378                         sprintf(pSesInfo->serverName, "%pI4",
2379                                 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2380
2381                 write_lock(&cifs_tcp_ses_lock);
2382                 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2383                 write_unlock(&cifs_tcp_ses_lock);
2384
2385                 /* volume_info->password freed at unmount */
2386                 if (volume_info->password) {
2387                         pSesInfo->password = kstrdup(volume_info->password,
2388                                                      GFP_KERNEL);
2389                         if (!pSesInfo->password) {
2390                                 rc = -ENOMEM;
2391                                 goto mount_fail_check;
2392                         }
2393                 }
2394                 if (volume_info->username)
2395                         strncpy(pSesInfo->userName, volume_info->username,
2396                                 MAX_USERNAME_SIZE);
2397                 if (volume_info->domainname) {
2398                         int len = strlen(volume_info->domainname);
2399                         pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2400                         if (pSesInfo->domainName)
2401                                 strcpy(pSesInfo->domainName,
2402                                         volume_info->domainname);
2403                 }
2404                 pSesInfo->linux_uid = volume_info->linux_uid;
2405                 pSesInfo->overrideSecFlg = volume_info->secFlg;
2406                 down(&pSesInfo->sesSem);
2407
2408                 /* BB FIXME need to pass vol->secFlgs BB */
2409                 rc = cifs_setup_session(xid, pSesInfo,
2410                                         cifs_sb->local_nls);
2411                 up(&pSesInfo->sesSem);
2412         }
2413
2414         /* search for existing tcon to this server share */
2415         if (!rc) {
2416                 setup_cifs_sb(volume_info, cifs_sb);
2417
2418                 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2419                 if (tcon) {
2420                         cFYI(1, ("Found match on UNC path"));
2421                         /* existing tcon already has a reference */
2422                         cifs_put_smb_ses(pSesInfo);
2423                         if (tcon->seal != volume_info->seal)
2424                                 cERROR(1, ("transport encryption setting "
2425                                            "conflicts with existing tid"));
2426                 } else {
2427                         tcon = tconInfoAlloc();
2428                         if (tcon == NULL) {
2429                                 rc = -ENOMEM;
2430                                 goto mount_fail_check;
2431                         }
2432
2433                         tcon->ses = pSesInfo;
2434                         if (volume_info->password) {
2435                                 tcon->password = kstrdup(volume_info->password,
2436                                                          GFP_KERNEL);
2437                                 if (!tcon->password) {
2438                                         rc = -ENOMEM;
2439                                         goto mount_fail_check;
2440                                 }
2441                         }
2442
2443                         if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2444                             && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2445                                 cERROR(1, ("Missing share name"));
2446                                 rc = -ENODEV;
2447                                 goto mount_fail_check;
2448                         } else {
2449                                 /* BB Do we need to wrap sesSem around
2450                                  * this TCon call and Unix SetFS as
2451                                  * we do on SessSetup and reconnect? */
2452                                 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2453                                               tcon, cifs_sb->local_nls);
2454                                 cFYI(1, ("CIFS Tcon rc = %d", rc));
2455                                 if (volume_info->nodfs) {
2456                                         tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2457                                         cFYI(1, ("DFS disabled (%d)",
2458                                                 tcon->Flags));
2459                                 }
2460                         }
2461                         if (rc)
2462                                 goto remote_path_check;
2463                         tcon->seal = volume_info->seal;
2464                         write_lock(&cifs_tcp_ses_lock);
2465                         list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2466                         write_unlock(&cifs_tcp_ses_lock);
2467                 }
2468
2469                 /* we can have only one retry value for a connection
2470                    to a share so for resources mounted more than once
2471                    to the same server share the last value passed in
2472                    for the retry flag is used */
2473                 tcon->retry = volume_info->retry;
2474                 tcon->nocase = volume_info->nocase;
2475                 tcon->local_lease = volume_info->local_lease;
2476         }
2477         if (pSesInfo) {
2478                 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2479                         sb->s_maxbytes = (u64) 1 << 63;
2480                 } else
2481                         sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2482         }
2483
2484         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2485         sb->s_time_gran = 100;
2486
2487         if (rc)
2488                 goto remote_path_check;
2489
2490         cifs_sb->tcon = tcon;
2491
2492         /* do not care if following two calls succeed - informational */
2493         if (!tcon->ipc) {
2494                 CIFSSMBQFSDeviceInfo(xid, tcon);
2495                 CIFSSMBQFSAttributeInfo(xid, tcon);
2496         }
2497
2498         /* tell server which Unix caps we support */
2499         if (tcon->ses->capabilities & CAP_UNIX)
2500                 /* reset of caps checks mount to see if unix extensions
2501                    disabled for just this mount */
2502                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2503         else
2504                 tcon->unix_ext = 0; /* server does not support them */
2505
2506         /* convert forward to back slashes in prepath here if needed */
2507         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2508                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2509
2510         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2511                 cifs_sb->rsize = 1024 * 127;
2512                 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2513         }
2514         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2515                 cifs_sb->wsize = min(cifs_sb->wsize,
2516                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2517         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2518                 cifs_sb->rsize = min(cifs_sb->rsize,
2519                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2520
2521 remote_path_check:
2522         /* check if a whole path (including prepath) is not remote */
2523         if (!rc && cifs_sb->prepathlen && tcon) {
2524                 /* build_path_to_root works only when we have a valid tcon */
2525                 full_path = cifs_build_path_to_root(cifs_sb);
2526                 if (full_path == NULL) {
2527                         rc = -ENOMEM;
2528                         goto mount_fail_check;
2529                 }
2530                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2531                 if (rc != -EREMOTE) {
2532                         kfree(full_path);
2533                         goto mount_fail_check;
2534                 }
2535                 kfree(full_path);
2536         }
2537
2538         /* get referral if needed */
2539         if (rc == -EREMOTE) {
2540 #ifdef CONFIG_CIFS_DFS_UPCALL
2541                 if (referral_walks_count > MAX_NESTED_LINKS) {
2542                         /*
2543                          * BB: when we implement proper loop detection,
2544                          *     we will remove this check. But now we need it
2545                          *     to prevent an indefinite loop if 'DFS tree' is
2546                          *     misconfigured (i.e. has loops).
2547                          */
2548                         rc = -ELOOP;
2549                         goto mount_fail_check;
2550                 }
2551                 /* convert forward to back slashes in prepath here if needed */
2552                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2553                         convert_delimiter(cifs_sb->prepath,
2554                                         CIFS_DIR_SEP(cifs_sb));
2555                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2556                 if (IS_ERR(full_path)) {
2557                         rc = PTR_ERR(full_path);
2558                         goto mount_fail_check;
2559                 }
2560
2561                 cFYI(1, ("Getting referral for: %s", full_path));
2562                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2563                         cifs_sb->local_nls, &num_referrals, &referrals,
2564                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2565                 if (!rc && num_referrals > 0) {
2566                         char *fake_devname = NULL;
2567
2568                         if (mount_data != mount_data_global)
2569                                 kfree(mount_data);
2570                         mount_data = cifs_compose_mount_options(
2571                                         cifs_sb->mountdata, full_path + 1,
2572                                         referrals, &fake_devname);
2573                         kfree(fake_devname);
2574                         free_dfs_info_array(referrals, num_referrals);
2575
2576                         if (tcon)
2577                                 cifs_put_tcon(tcon);
2578                         else if (pSesInfo)
2579                                 cifs_put_smb_ses(pSesInfo);
2580
2581                         cleanup_volume_info(&volume_info);
2582                         FreeXid(xid);
2583                         kfree(full_path);
2584                         referral_walks_count++;
2585                         goto try_mount_again;
2586                 }
2587 #else /* No DFS support, return error on mount */
2588                 rc = -EOPNOTSUPP;
2589 #endif
2590         }
2591
2592 mount_fail_check:
2593         /* on error free sesinfo and tcon struct if needed */
2594         if (rc) {
2595                 if (mount_data != mount_data_global)
2596                         kfree(mount_data);
2597                 /* If find_unc succeeded then rc == 0 so we can not end */
2598                 /* up accidently freeing someone elses tcon struct */
2599                 if (tcon)
2600                         cifs_put_tcon(tcon);
2601                 else if (pSesInfo)
2602                         cifs_put_smb_ses(pSesInfo);
2603                 else
2604                         cifs_put_tcp_session(srvTcp);
2605                 goto out;
2606         }
2607
2608         /* volume_info->password is freed above when existing session found
2609         (in which case it is not needed anymore) but when new sesion is created
2610         the password ptr is put in the new session structure (in which case the
2611         password will be freed at unmount time) */
2612 out:
2613         /* zero out password before freeing */
2614         cleanup_volume_info(&volume_info);
2615         FreeXid(xid);
2616         return rc;
2617 }
2618
2619 int
2620 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2621          const char *tree, struct cifsTconInfo *tcon,
2622          const struct nls_table *nls_codepage)
2623 {
2624         struct smb_hdr *smb_buffer;
2625         struct smb_hdr *smb_buffer_response;
2626         TCONX_REQ *pSMB;
2627         TCONX_RSP *pSMBr;
2628         unsigned char *bcc_ptr;
2629         int rc = 0;
2630         int length, bytes_left;
2631         __u16 count;
2632
2633         if (ses == NULL)
2634                 return -EIO;
2635
2636         smb_buffer = cifs_buf_get();
2637         if (smb_buffer == NULL) {
2638                 return -ENOMEM;
2639         }
2640         smb_buffer_response = smb_buffer;
2641
2642         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2643                         NULL /*no tid */ , 4 /*wct */ );
2644
2645         smb_buffer->Mid = GetNextMid(ses->server);
2646         smb_buffer->Uid = ses->Suid;
2647         pSMB = (TCONX_REQ *) smb_buffer;
2648         pSMBr = (TCONX_RSP *) smb_buffer_response;
2649
2650         pSMB->AndXCommand = 0xFF;
2651         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2652         bcc_ptr = &pSMB->Password[0];
2653         if ((ses->server->secMode) & SECMODE_USER) {
2654                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2655                 *bcc_ptr = 0; /* password is null byte */
2656                 bcc_ptr++;              /* skip password */
2657                 /* already aligned so no need to do it below */
2658         } else {
2659                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2660                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2661                    specified as required (when that support is added to
2662                    the vfs in the future) as only NTLM or the much
2663                    weaker LANMAN (which we do not send by default) is accepted
2664                    by Samba (not sure whether other servers allow
2665                    NTLMv2 password here) */
2666 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2667                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2668                     (ses->server->secType == LANMAN))
2669                         calc_lanman_hash(tcon->password, ses->server->cryptKey,
2670                                          ses->server->secMode &
2671                                             SECMODE_PW_ENCRYPT ? true : false,
2672                                          bcc_ptr);
2673                 else
2674 #endif /* CIFS_WEAK_PW_HASH */
2675                 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2676                              bcc_ptr);
2677
2678                 bcc_ptr += CIFS_SESS_KEY_SIZE;
2679                 if (ses->capabilities & CAP_UNICODE) {
2680                         /* must align unicode strings */
2681                         *bcc_ptr = 0; /* null byte password */
2682                         bcc_ptr++;
2683                 }
2684         }
2685
2686         if (ses->server->secMode &
2687                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2688                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2689
2690         if (ses->capabilities & CAP_STATUS32) {
2691                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2692         }
2693         if (ses->capabilities & CAP_DFS) {
2694                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2695         }
2696         if (ses->capabilities & CAP_UNICODE) {
2697                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2698                 length =
2699                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2700                         6 /* max utf8 char length in bytes */ *
2701                         (/* server len*/ + 256 /* share len */), nls_codepage);
2702                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
2703                 bcc_ptr += 2;   /* skip trailing null */
2704         } else {                /* ASCII */
2705                 strcpy(bcc_ptr, tree);
2706                 bcc_ptr += strlen(tree) + 1;
2707         }
2708         strcpy(bcc_ptr, "?????");
2709         bcc_ptr += strlen("?????");
2710         bcc_ptr += 1;
2711         count = bcc_ptr - &pSMB->Password[0];
2712         pSMB->hdr.smb_buf_length += count;
2713         pSMB->ByteCount = cpu_to_le16(count);
2714
2715         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2716                          CIFS_STD_OP);
2717
2718         /* above now done in SendReceive */
2719         if ((rc == 0) && (tcon != NULL)) {
2720                 bool is_unicode;
2721
2722                 tcon->tidStatus = CifsGood;
2723                 tcon->need_reconnect = false;
2724                 tcon->tid = smb_buffer_response->Tid;
2725                 bcc_ptr = pByteArea(smb_buffer_response);
2726                 bytes_left = BCC(smb_buffer_response);
2727                 length = strnlen(bcc_ptr, bytes_left - 2);
2728                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2729                         is_unicode = true;
2730                 else
2731                         is_unicode = false;
2732
2733
2734                 /* skip service field (NB: this field is always ASCII) */
2735                 if (length == 3) {
2736                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2737                             (bcc_ptr[2] == 'C')) {
2738                                 cFYI(1, ("IPC connection"));
2739                                 tcon->ipc = 1;
2740                         }
2741                 } else if (length == 2) {
2742                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2743                                 /* the most common case */
2744                                 cFYI(1, ("disk share connection"));
2745                         }
2746                 }
2747                 bcc_ptr += length + 1;
2748                 bytes_left -= (length + 1);
2749                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2750
2751                 /* mostly informational -- no need to fail on error here */
2752                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2753                                                       bytes_left, is_unicode,
2754                                                       nls_codepage);
2755
2756                 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2757
2758                 if ((smb_buffer_response->WordCount == 3) ||
2759                          (smb_buffer_response->WordCount == 7))
2760                         /* field is in same location */
2761                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2762                 else
2763                         tcon->Flags = 0;
2764                 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2765         } else if ((rc == 0) && tcon == NULL) {
2766                 /* all we need to save for IPC$ connection */
2767                 ses->ipc_tid = smb_buffer_response->Tid;
2768         }
2769
2770         cifs_buf_release(smb_buffer);
2771         return rc;
2772 }
2773
2774 int
2775 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2776 {
2777         int rc = 0;
2778         char *tmp;
2779
2780         if (cifs_sb->tcon)
2781                 cifs_put_tcon(cifs_sb->tcon);
2782
2783         cifs_sb->tcon = NULL;
2784         tmp = cifs_sb->prepath;
2785         cifs_sb->prepathlen = 0;
2786         cifs_sb->prepath = NULL;
2787         kfree(tmp);
2788
2789         return rc;
2790 }
2791
2792 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2793                                            struct nls_table *nls_info)
2794 {
2795         int rc = 0;
2796         int first_time = 0;
2797         struct TCP_Server_Info *server = pSesInfo->server;
2798
2799         /* what if server changes its buffer size after dropping the session? */
2800         if (server->maxBuf == 0) /* no need to send on reconnect */ {
2801                 rc = CIFSSMBNegotiate(xid, pSesInfo);
2802                 if (rc == -EAGAIN) {
2803                         /* retry only once on 1st time connection */
2804                         rc = CIFSSMBNegotiate(xid, pSesInfo);
2805                         if (rc == -EAGAIN)
2806                                 rc = -EHOSTDOWN;
2807                 }
2808                 if (rc == 0) {
2809                         spin_lock(&GlobalMid_Lock);
2810                         if (server->tcpStatus != CifsExiting)
2811                                 server->tcpStatus = CifsGood;
2812                         else
2813                                 rc = -EHOSTDOWN;
2814                         spin_unlock(&GlobalMid_Lock);
2815
2816                 }
2817                 first_time = 1;
2818         }
2819
2820         if (rc)
2821                 goto ss_err_exit;
2822
2823         pSesInfo->flags = 0;
2824         pSesInfo->capabilities = server->capabilities;
2825         if (linuxExtEnabled == 0)
2826                 pSesInfo->capabilities &= (~CAP_UNIX);
2827
2828         cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2829                  server->secMode, server->capabilities, server->timeAdj));
2830
2831         rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2832         if (rc) {
2833                 cERROR(1, ("Send error in SessSetup = %d", rc));
2834         } else {
2835                 cFYI(1, ("CIFS Session Established successfully"));
2836                 spin_lock(&GlobalMid_Lock);
2837                 pSesInfo->status = CifsGood;
2838                 pSesInfo->need_reconnect = false;
2839                 spin_unlock(&GlobalMid_Lock);
2840         }
2841
2842 ss_err_exit:
2843         return rc;
2844 }
2845