fs/cifs/connect.c

   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2009
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/net.h>
  23 #include <linux/string.h>
  24 #include <linux/list.h>
  25 #include <linux/wait.h>
  26 #include <linux/slab.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/mempool.h>
  31 #include <linux/delay.h>
  32 #include <linux/completion.h>
  33 #include <linux/kthread.h>
  34 #include <linux/pagevec.h>
  35 #include <linux/freezer.h>
  36 #include <linux/namei.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/processor.h>
  39 #include <linux/inet.h>
  40 #include <net/ipv6.h>
  41 #include "cifspdu.h"
  42 #include "cifsglob.h"
  43 #include "cifsproto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "cifs_fs_sb.h"
  47 #include "ntlmssp.h"
  48 #include "nterr.h"
  49 #include "rfc1002pdu.h"
  50 #include "cn_cifs.h"
  51 #include "fscache.h"
  52
  53 #define CIFS_PORT 445
  54 #define RFC1001_PORT 139
  55
  56 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  57                          unsigned char *p24);
  58
  59 extern mempool_t *cifs_req_poolp;
  60
  61 struct smb_vol {
  62         char *username;
  63         char *password;
  64         char *domainname;
  65         char *UNC;
  66         char *UNCip;
  67         char *iocharset;  /* local code page for mapping to and from Unicode */
  68         char source_rfc1001_name[16]; /* netbios name of client */
  69         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  70         uid_t linux_uid;
  71         gid_t linux_gid;
  72         mode_t file_mode;
  73         mode_t dir_mode;
  74         unsigned secFlg;
  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         bool sockopt_tcp_nodelay:1;
 104         unsigned short int port;
 105         char *prepath;
 106         struct nls_table *local_nls;
 107 };
 108
 109 static int ipv4_connect(struct TCP_Server_Info *server);
 110 static int ipv6_connect(struct TCP_Server_Info *server);
 111
 112 /*
 113  * cifs tcp session reconnection
 114  *
 115  * mark tcp session as reconnecting so temporarily locked
 116  * mark all smb sessions as reconnecting for tcp session
 117  * reconnect tcp session
 118  * wake up waiters on reconnection? - (not needed currently)
 119  */
 120 static int
 121 cifs_reconnect(struct TCP_Server_Info *server)
 122 {
 123         int rc = 0;
 124         struct list_head *tmp, *tmp2;
 125         struct cifsSesInfo *ses;
 126         struct cifsTconInfo *tcon;
 127         struct mid_q_entry *mid_entry;
 128
 129         spin_lock(&GlobalMid_Lock);
 130         if (server->tcpStatus == CifsExiting) {
 131                 /* the demux thread will exit normally
 132                 next time through the loop */
 133                 spin_unlock(&GlobalMid_Lock);
 134                 return rc;
 135         } else
 136                 server->tcpStatus = CifsNeedReconnect;
 137         spin_unlock(&GlobalMid_Lock);
 138         server->maxBuf = 0;
 139
 140         cFYI(1, "Reconnecting tcp session");
 141
 142         /* before reconnecting the tcp session, mark the smb session (uid)
 143                 and the tid bad so they are not used until reconnected */
 144         read_lock(&cifs_tcp_ses_lock);
 145         list_for_each(tmp, &server->smb_ses_list) {
 146                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 147                 ses->need_reconnect = true;
 148                 ses->ipc_tid = 0;
 149                 list_for_each(tmp2, &ses->tcon_list) {
 150                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 151                         tcon->need_reconnect = true;
 152                 }
 153         }
 154         read_unlock(&cifs_tcp_ses_lock);
 155         /* do not want to be sending data on a socket we are freeing */
 156         mutex_lock(&server->srv_mutex);
 157         if (server->ssocket) {
 158                 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
 159                         server->ssocket->flags);
 160                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 161                 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
 162                         server->ssocket->state,
 163                         server->ssocket->flags);
 164                 sock_release(server->ssocket);
 165                 server->ssocket = NULL;
 166         }
 167
 168         spin_lock(&GlobalMid_Lock);
 169         list_for_each(tmp, &server->pending_mid_q) {
 170                 mid_entry = list_entry(tmp, struct
 171                                         mid_q_entry,
 172                                         qhead);
 173                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 174                                 /* Mark other intransit requests as needing
 175                                    retry so we do not immediately mark the
 176                                    session bad again (ie after we reconnect
 177                                    below) as they timeout too */
 178                         mid_entry->midState = MID_RETRY_NEEDED;
 179                 }
 180         }
 181         spin_unlock(&GlobalMid_Lock);
 182         mutex_unlock(&server->srv_mutex);
 183
 184         while ((server->tcpStatus != CifsExiting) &&
 185                (server->tcpStatus != CifsGood)) {
 186                 try_to_freeze();
 187                 if (server->addr.sockAddr6.sin6_family == AF_INET6)
 188                         rc = ipv6_connect(server);
 189                 else
 190                         rc = ipv4_connect(server);
 191                 if (rc) {
 192                         cFYI(1, "reconnect error %d", rc);
 193                         msleep(3000);
 194                 } else {
 195                         atomic_inc(&tcpSesReconnectCount);
 196                         spin_lock(&GlobalMid_Lock);
 197                         if (server->tcpStatus != CifsExiting)
 198                                 server->tcpStatus = CifsGood;
 199                         server->sequence_number = 0;
 200                         spin_unlock(&GlobalMid_Lock);
 201         /*              atomic_set(&server->inFlight,0);*/
 202                         wake_up(&server->response_q);
 203                 }
 204         }
 205         return rc;
 206 }
 207
 208 /*
 209         return codes:
 210                 0       not a transact2, or all data present
 211                 >0      transact2 with that much data missing
 212                 -EINVAL = invalid transact2
 213
 214  */
 215 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 216 {
 217         struct smb_t2_rsp *pSMBt;
 218         int total_data_size;
 219         int data_in_this_rsp;
 220         int remaining;
 221
 222         if (pSMB->Command != SMB_COM_TRANSACTION2)
 223                 return 0;
 224
 225         /* check for plausible wct, bcc and t2 data and parm sizes */
 226         /* check for parm and data offset going beyond end of smb */
 227         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 228                 cFYI(1, "invalid transact2 word count");
 229                 return -EINVAL;
 230         }
 231
 232         pSMBt = (struct smb_t2_rsp *)pSMB;
 233
 234         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 235         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 236
 237         remaining = total_data_size - data_in_this_rsp;
 238
 239         if (remaining == 0)
 240                 return 0;
 241         else if (remaining < 0) {
 242                 cFYI(1, "total data %d smaller than data in frame %d",
 243                         total_data_size, data_in_this_rsp);
 244                 return -EINVAL;
 245         } else {
 246                 cFYI(1, "missing %d bytes from transact2, check next response",
 247                         remaining);
 248                 if (total_data_size > maxBufSize) {
 249                         cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 250                                 total_data_size, maxBufSize);
 251                         return -EINVAL;
 252                 }
 253                 return remaining;
 254         }
 255 }
 256
 257 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 258 {
 259         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 260         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 261         int total_data_size;
 262         int total_in_buf;
 263         int remaining;
 264         int total_in_buf2;
 265         char *data_area_of_target;
 266         char *data_area_of_buf2;
 267         __u16 byte_count;
 268
 269         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 270
 271         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 272                 cFYI(1, "total data size of primary and secondary t2 differ");
 273         }
 274
 275         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 276
 277         remaining = total_data_size - total_in_buf;
 278
 279         if (remaining < 0)
 280                 return -EINVAL;
 281
 282         if (remaining == 0) /* nothing to do, ignore */
 283                 return 0;
 284
 285         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 286         if (remaining < total_in_buf2) {
 287                 cFYI(1, "transact2 2nd response contains too much data");
 288         }
 289
 290         /* find end of first SMB data area */
 291         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 292                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 293         /* validate target area */
 294
 295         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 296                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 297
 298         data_area_of_target += total_in_buf;
 299
 300         /* copy second buffer into end of first buffer */
 301         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 302         total_in_buf += total_in_buf2;
 303         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 304         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 305         byte_count += total_in_buf2;
 306         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 307
 308         byte_count = pTargetSMB->smb_buf_length;
 309         byte_count += total_in_buf2;
 310
 311         /* BB also add check that we are not beyond maximum buffer size */
 312
 313         pTargetSMB->smb_buf_length = byte_count;
 314
 315         if (remaining == total_in_buf2) {
 316                 cFYI(1, "found the last secondary response");
 317                 return 0; /* we are done */
 318         } else /* more responses to go */
 319                 return 1;
 320
 321 }
 322
 323 static int
 324 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 325 {
 326         int length;
 327         unsigned int pdu_length, total_read;
 328         struct smb_hdr *smb_buffer = NULL;
 329         struct smb_hdr *bigbuf = NULL;
 330         struct smb_hdr *smallbuf = NULL;
 331         struct msghdr smb_msg;
 332         struct kvec iov;
 333         struct socket *csocket = server->ssocket;
 334         struct list_head *tmp;
 335         struct cifsSesInfo *ses;
 336         struct task_struct *task_to_wake = NULL;
 337         struct mid_q_entry *mid_entry;
 338         char temp;
 339         bool isLargeBuf = false;
 340         bool isMultiRsp;
 341         int reconnect;
 342
 343         current->flags |= PF_MEMALLOC;
 344         cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
 345
 346         length = atomic_inc_return(&tcpSesAllocCount);
 347         if (length > 1)
 348                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 349                                 GFP_KERNEL);
 350
 351         set_freezable();
 352         while (server->tcpStatus != CifsExiting) {
 353                 if (try_to_freeze())
 354                         continue;
 355                 if (bigbuf == NULL) {
 356                         bigbuf = cifs_buf_get();
 357                         if (!bigbuf) {
 358                                 cERROR(1, "No memory for large SMB response");
 359                                 msleep(3000);
 360                                 /* retry will check if exiting */
 361                                 continue;
 362                         }
 363                 } else if (isLargeBuf) {
 364                         /* we are reusing a dirty large buf, clear its start */
 365                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 366                 }
 367
 368                 if (smallbuf == NULL) {
 369                         smallbuf = cifs_small_buf_get();
 370                         if (!smallbuf) {
 371                                 cERROR(1, "No memory for SMB response");
 372                                 msleep(1000);
 373                                 /* retry will check if exiting */
 374                                 continue;
 375                         }
 376                         /* beginning of smb buffer is cleared in our buf_get */
 377                 } else /* if existing small buf clear beginning */
 378                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 379
 380                 isLargeBuf = false;
 381                 isMultiRsp = false;
 382                 smb_buffer = smallbuf;
 383                 iov.iov_base = smb_buffer;
 384                 iov.iov_len = 4;
 385                 smb_msg.msg_control = NULL;
 386                 smb_msg.msg_controllen = 0;
 387                 pdu_length = 4; /* enough to get RFC1001 header */
 388 incomplete_rcv:
 389                 length =
 390                     kernel_recvmsg(csocket, &smb_msg,
 391                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 392
 393                 if (server->tcpStatus == CifsExiting) {
 394                         break;
 395                 } else if (server->tcpStatus == CifsNeedReconnect) {
 396                         cFYI(1, "Reconnect after server stopped responding");
 397                         cifs_reconnect(server);
 398                         cFYI(1, "call to reconnect done");
 399                         csocket = server->ssocket;
 400                         continue;
 401                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 402                         msleep(1); /* minimum sleep to prevent looping
 403                                 allowing socket to clear and app threads to set
 404                                 tcpStatus CifsNeedReconnect if server hung */
 405                         if (pdu_length < 4) {
 406                                 iov.iov_base = (4 - pdu_length) +
 407                                                         (char *)smb_buffer;
 408                                 iov.iov_len = pdu_length;
 409                                 smb_msg.msg_control = NULL;
 410                                 smb_msg.msg_controllen = 0;
 411                                 goto incomplete_rcv;
 412                         } else
 413                                 continue;
 414                 } else if (length <= 0) {
 415                         if (server->tcpStatus == CifsNew) {
 416                                 cFYI(1, "tcp session abend after SMBnegprot");
 417                                 /* some servers kill the TCP session rather than
 418                                    returning an SMB negprot error, in which
 419                                    case reconnecting here is not going to help,
 420                                    and so simply return error to mount */
 421                                 break;
 422                         }
 423                         if (!try_to_freeze() && (length == -EINTR)) {
 424                                 cFYI(1, "cifsd thread killed");
 425                                 break;
 426                         }
 427                         cFYI(1, "Reconnect after unexpected peek error %d",
 428                                 length);
 429                         cifs_reconnect(server);
 430                         csocket = server->ssocket;
 431                         wake_up(&server->response_q);
 432                         continue;
 433                 } else if (length < pdu_length) {
 434                         cFYI(1, "requested %d bytes but only got %d bytes",
 435                                   pdu_length, length);
 436                         pdu_length -= length;
 437                         msleep(1);
 438                         goto incomplete_rcv;
 439                 }
 440
 441                 /* The right amount was read from socket - 4 bytes */
 442                 /* so we can now interpret the length field */
 443
 444                 /* the first byte big endian of the length field,
 445                 is actually not part of the length but the type
 446                 with the most common, zero, as regular data */
 447                 temp = *((char *) smb_buffer);
 448
 449                 /* Note that FC 1001 length is big endian on the wire,
 450                 but we convert it here so it is always manipulated
 451                 as host byte order */
 452                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 453                 smb_buffer->smb_buf_length = pdu_length;
 454
 455                 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
 456
 457                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 458                         continue;
 459                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 460                         cFYI(1, "Good RFC 1002 session rsp");
 461                         continue;
 462                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 463                         /* we get this from Windows 98 instead of
 464                            an error on SMB negprot response */
 465                         cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
 466                                 pdu_length);
 467                         if (server->tcpStatus == CifsNew) {
 468                                 /* if nack on negprot (rather than
 469                                 ret of smb negprot error) reconnecting
 470                                 not going to help, ret error to mount */
 471                                 break;
 472                         } else {
 473                                 /* give server a second to
 474                                 clean up before reconnect attempt */
 475                                 msleep(1000);
 476                                 /* always try 445 first on reconnect
 477                                 since we get NACK on some if we ever
 478                                 connected to port 139 (the NACK is
 479                                 since we do not begin with RFC1001
 480                                 session initialize frame) */
 481                                 server->addr.sockAddr.sin_port =
 482                                         htons(CIFS_PORT);
 483                                 cifs_reconnect(server);
 484                                 csocket = server->ssocket;
 485                                 wake_up(&server->response_q);
 486                                 continue;
 487                         }
 488                 } else if (temp != (char) 0) {
 489                         cERROR(1, "Unknown RFC 1002 frame");
 490                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 491                                       length);
 492                         cifs_reconnect(server);
 493                         csocket = server->ssocket;
 494                         continue;
 495                 }
 496
 497                 /* else we have an SMB response */
 498                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 499                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 500                         cERROR(1, "Invalid size SMB length %d pdu_length %d",
 501                                         length, pdu_length+4);
 502                         cifs_reconnect(server);
 503                         csocket = server->ssocket;
 504                         wake_up(&server->response_q);
 505                         continue;
 506                 }
 507
 508                 /* else length ok */
 509                 reconnect = 0;
 510
 511                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 512                         isLargeBuf = true;
 513                         memcpy(bigbuf, smallbuf, 4);
 514                         smb_buffer = bigbuf;
 515                 }
 516                 length = 0;
 517                 iov.iov_base = 4 + (char *)smb_buffer;
 518                 iov.iov_len = pdu_length;
 519                 for (total_read = 0; total_read < pdu_length;
 520                      total_read += length) {
 521                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 522                                                 pdu_length - total_read, 0);
 523                         if ((server->tcpStatus == CifsExiting) ||
 524                             (length == -EINTR)) {
 525                                 /* then will exit */
 526                                 reconnect = 2;
 527                                 break;
 528                         } else if (server->tcpStatus == CifsNeedReconnect) {
 529                                 cifs_reconnect(server);
 530                                 csocket = server->ssocket;
 531                                 /* Reconnect wakes up rspns q */
 532                                 /* Now we will reread sock */
 533                                 reconnect = 1;
 534                                 break;
 535                         } else if ((length == -ERESTARTSYS) ||
 536                                    (length == -EAGAIN)) {
 537                                 msleep(1); /* minimum sleep to prevent looping,
 538                                               allowing socket to clear and app
 539                                               threads to set tcpStatus
 540                                               CifsNeedReconnect if server hung*/
 541                                 length = 0;
 542                                 continue;
 543                         } else if (length <= 0) {
 544                                 cERROR(1, "Received no data, expecting %d",
 545                                               pdu_length - total_read);
 546                                 cifs_reconnect(server);
 547                                 csocket = server->ssocket;
 548                                 reconnect = 1;
 549                                 break;
 550                         }
 551                 }
 552                 if (reconnect == 2)
 553                         break;
 554                 else if (reconnect == 1)
 555                         continue;
 556
 557                 length += 4; /* account for rfc1002 hdr */
 558
 559
 560                 dump_smb(smb_buffer, length);
 561                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 562                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 563                         continue;
 564                 }
 565
 566
 567                 task_to_wake = NULL;
 568                 spin_lock(&GlobalMid_Lock);
 569                 list_for_each(tmp, &server->pending_mid_q) {
 570                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 571
 572                         if ((mid_entry->mid == smb_buffer->Mid) &&
 573                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 574                             (mid_entry->command == smb_buffer->Command)) {
 575                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 576                                         /* We have a multipart transact2 resp */
 577                                         isMultiRsp = true;
 578                                         if (mid_entry->resp_buf) {
 579                                                 /* merge response - fix up 1st*/
 580                                                 if (coalesce_t2(smb_buffer,
 581                                                         mid_entry->resp_buf)) {
 582                                                         mid_entry->multiRsp =
 583                                                                  true;
 584                                                         break;
 585                                                 } else {
 586                                                         /* all parts received */
 587                                                         mid_entry->multiEnd =
 588                                                                  true;
 589                                                         goto multi_t2_fnd;
 590                                                 }
 591                                         } else {
 592                                                 if (!isLargeBuf) {
 593                                                         cERROR(1, "1st trans2 resp needs bigbuf");
 594                                         /* BB maybe we can fix this up,  switch
 595                                            to already allocated large buffer? */
 596                                                 } else {
 597                                                         /* Have first buffer */
 598                                                         mid_entry->resp_buf =
 599                                                                  smb_buffer;
 600                                                         mid_entry->largeBuf =
 601                                                                  true;
 602                                                         bigbuf = NULL;
 603                                                 }
 604                                         }
 605                                         break;
 606                                 }
 607                                 mid_entry->resp_buf = smb_buffer;
 608                                 mid_entry->largeBuf = isLargeBuf;
 609 multi_t2_fnd:
 610                                 task_to_wake = mid_entry->tsk;
 611                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 612 #ifdef CONFIG_CIFS_STATS2
 613                                 mid_entry->when_received = jiffies;
 614 #endif
 615                                 /* so we do not time out requests to  server
 616                                 which is still responding (since server could
 617                                 be busy but not dead) */
 618                                 server->lstrp = jiffies;
 619                                 break;
 620                         }
 621                 }
 622                 spin_unlock(&GlobalMid_Lock);
 623                 if (task_to_wake) {
 624                         /* Was previous buf put in mpx struct for multi-rsp? */
 625                         if (!isMultiRsp) {
 626                                 /* smb buffer will be freed by user thread */
 627                                 if (isLargeBuf)
 628                                         bigbuf = NULL;
 629                                 else
 630                                         smallbuf = NULL;
 631                         }
 632                         wake_up_process(task_to_wake);
 633                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 634                            !isMultiRsp) {
 635                         cERROR(1, "No task to wake, unknown frame received! "
 636                                    "NumMids %d", midCount.counter);
 637                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 638                                       sizeof(struct smb_hdr));
 639 #ifdef CONFIG_CIFS_DEBUG2
 640                         cifs_dump_detail(smb_buffer);
 641                         cifs_dump_mids(server);
 642 #endif /* CIFS_DEBUG2 */
 643
 644                 }
 645         } /* end while !EXITING */
 646
 647         /* take it off the list, if it's not already */
 648         write_lock(&cifs_tcp_ses_lock);
 649         list_del_init(&server->tcp_ses_list);
 650         write_unlock(&cifs_tcp_ses_lock);
 651
 652         spin_lock(&GlobalMid_Lock);
 653         server->tcpStatus = CifsExiting;
 654         spin_unlock(&GlobalMid_Lock);
 655         wake_up_all(&server->response_q);
 656
 657         /* check if we have blocked requests that need to free */
 658         /* Note that cifs_max_pending is normally 50, but
 659         can be set at module install time to as little as two */
 660         spin_lock(&GlobalMid_Lock);
 661         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 662                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 663         /* We do not want to set the max_pending too low or we
 664         could end up with the counter going negative */
 665         spin_unlock(&GlobalMid_Lock);
 666         /* Although there should not be any requests blocked on
 667         this queue it can not hurt to be paranoid and try to wake up requests
 668         that may haven been blocked when more than 50 at time were on the wire
 669         to the same server - they now will see the session is in exit state
 670         and get out of SendReceive.  */
 671         wake_up_all(&server->request_q);
 672         /* give those requests time to exit */
 673         msleep(125);
 674
 675         if (server->ssocket) {
 676                 sock_release(csocket);
 677                 server->ssocket = NULL;
 678         }
 679         /* buffer usuallly freed in free_mid - need to free it here on exit */
 680         cifs_buf_release(bigbuf);
 681         if (smallbuf) /* no sense logging a debug message if NULL */
 682                 cifs_small_buf_release(smallbuf);
 683
 684         /*
 685          * BB: we shouldn't have to do any of this. It shouldn't be
 686          * possible to exit from the thread with active SMB sessions
 687          */
 688         read_lock(&cifs_tcp_ses_lock);
 689         if (list_empty(&server->pending_mid_q)) {
 690                 /* loop through server session structures attached to this and
 691                     mark them dead */
 692                 list_for_each(tmp, &server->smb_ses_list) {
 693                         ses = list_entry(tmp, struct cifsSesInfo,
 694                                          smb_ses_list);
 695                         ses->status = CifsExiting;
 696                         ses->server = NULL;
 697                 }
 698                 read_unlock(&cifs_tcp_ses_lock);
 699         } else {
 700                 /* although we can not zero the server struct pointer yet,
 701                 since there are active requests which may depnd on them,
 702                 mark the corresponding SMB sessions as exiting too */
 703                 list_for_each(tmp, &server->smb_ses_list) {
 704                         ses = list_entry(tmp, struct cifsSesInfo,
 705                                          smb_ses_list);
 706                         ses->status = CifsExiting;
 707                 }
 708
 709                 spin_lock(&GlobalMid_Lock);
 710                 list_for_each(tmp, &server->pending_mid_q) {
 711                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 712                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 713                                 cFYI(1, "Clearing Mid 0x%x - waking up ",
 714                                          mid_entry->mid);
 715                                 task_to_wake = mid_entry->tsk;
 716                                 if (task_to_wake)
 717                                         wake_up_process(task_to_wake);
 718                         }
 719                 }
 720                 spin_unlock(&GlobalMid_Lock);
 721                 read_unlock(&cifs_tcp_ses_lock);
 722                 /* 1/8th of sec is more than enough time for them to exit */
 723                 msleep(125);
 724         }
 725
 726         if (!list_empty(&server->pending_mid_q)) {
 727                 /* mpx threads have not exited yet give them
 728                 at least the smb send timeout time for long ops */
 729                 /* due to delays on oplock break requests, we need
 730                 to wait at least 45 seconds before giving up
 731                 on a request getting a response and going ahead
 732                 and killing cifsd */
 733                 cFYI(1, "Wait for exit from demultiplex thread");
 734                 msleep(46000);
 735                 /* if threads still have not exited they are probably never
 736                 coming home not much else we can do but free the memory */
 737         }
 738
 739         /* last chance to mark ses pointers invalid
 740         if there are any pointing to this (e.g
 741         if a crazy root user tried to kill cifsd
 742         kernel thread explicitly this might happen) */
 743         /* BB: This shouldn't be necessary, see above */
 744         read_lock(&cifs_tcp_ses_lock);
 745         list_for_each(tmp, &server->smb_ses_list) {
 746                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 747                 ses->server = NULL;
 748         }
 749         read_unlock(&cifs_tcp_ses_lock);
 750
 751         kfree(server->hostname);
 752         task_to_wake = xchg(&server->tsk, NULL);
 753         kfree(server);
 754
 755         length = atomic_dec_return(&tcpSesAllocCount);
 756         if (length  > 0)
 757                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 758                                 GFP_KERNEL);
 759
 760         /* if server->tsk was NULL then wait for a signal before exiting */
 761         if (!task_to_wake) {
 762                 set_current_state(TASK_INTERRUPTIBLE);
 763                 while (!signal_pending(current)) {
 764                         schedule();
 765                         set_current_state(TASK_INTERRUPTIBLE);
 766                 }
 767                 set_current_state(TASK_RUNNING);
 768         }
 769
 770         module_put_and_exit(0);
 771 }
 772
 773 /* extract the host portion of the UNC string */
 774 static char *
 775 extract_hostname(const char *unc)
 776 {
 777         const char *src;
 778         char *dst, *delim;
 779         unsigned int len;
 780
 781         /* skip double chars at beginning of string */
 782         /* BB: check validity of these bytes? */
 783         src = unc + 2;
 784
 785         /* delimiter between hostname and sharename is always '\\' now */
 786         delim = strchr(src, '\\');
 787         if (!delim)
 788                 return ERR_PTR(-EINVAL);
 789
 790         len = delim - src;
 791         dst = kmalloc((len + 1), GFP_KERNEL);
 792         if (dst == NULL)
 793                 return ERR_PTR(-ENOMEM);
 794
 795         memcpy(dst, src, len);
 796         dst[len] = '\0';
 797
 798         return dst;
 799 }
 800
 801 static int
 802 cifs_parse_mount_options(char *options, const char *devname,
 803                          struct smb_vol *vol)
 804 {
 805         char *value;
 806         char *data;
 807         unsigned int  temp_len, i, j;
 808         char separator[2];
 809         short int override_uid = -1;
 810         short int override_gid = -1;
 811         bool uid_specified = false;
 812         bool gid_specified = false;
 813
 814         separator[0] = ',';
 815         separator[1] = 0;
 816
 817         if (Local_System_Name[0] != 0)
 818                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 819         else {
 820                 char *nodename = utsname()->nodename;
 821                 int n = strnlen(nodename, 15);
 822                 memset(vol->source_rfc1001_name, 0x20, 15);
 823                 for (i = 0; i < n; i++) {
 824                         /* does not have to be perfect mapping since field is
 825                         informational, only used for servers that do not support
 826                         port 445 and it can be overridden at mount time */
 827                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 828                 }
 829         }
 830         vol->source_rfc1001_name[15] = 0;
 831         /* null target name indicates to use *SMBSERVR default called name
 832            if we end up sending RFC1001 session initialize */
 833         vol->target_rfc1001_name[0] = 0;
 834         vol->linux_uid = current_uid();  /* use current_euid() instead? */
 835         vol->linux_gid = current_gid();
 836
 837         /* default to only allowing write access to owner of the mount */
 838         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 839
 840         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 841         /* default is always to request posix paths. */
 842         vol->posix_paths = 1;
 843         /* default to using server inode numbers where available */
 844         vol->server_ino = 1;
 845
 846         if (!options)
 847                 return 1;
 848
 849         if (strncmp(options, "sep=", 4) == 0) {
 850                 if (options[4] != 0) {
 851                         separator[0] = options[4];
 852                         options += 5;
 853                 } else {
 854                         cFYI(1, "Null separator not allowed");
 855                 }
 856         }
 857
 858         while ((data = strsep(&options, separator)) != NULL) {
 859                 if (!*data)
 860                         continue;
 861                 if ((value = strchr(data, '=')) != NULL)
 862                         *value++ = '\0';
 863
 864                 /* Have to parse this before we parse for "user" */
 865                 if (strnicmp(data, "user_xattr", 10) == 0) {
 866                         vol->no_xattr = 0;
 867                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 868                         vol->no_xattr = 1;
 869                 } else if (strnicmp(data, "user", 4) == 0) {
 870                         if (!value) {
 871                                 printk(KERN_WARNING
 872                                        "CIFS: invalid or missing username\n");
 873                                 return 1;       /* needs_arg; */
 874                         } else if (!*value) {
 875                                 /* null user, ie anonymous, authentication */
 876                                 vol->nullauth = 1;
 877                         }
 878                         if (strnlen(value, 200) < 200) {
 879                                 vol->username = value;
 880                         } else {
 881                                 printk(KERN_WARNING "CIFS: username too long\n");
 882                                 return 1;
 883                         }
 884                 } else if (strnicmp(data, "pass", 4) == 0) {
 885                         if (!value) {
 886                                 vol->password = NULL;
 887                                 continue;
 888                         } else if (value[0] == 0) {
 889                                 /* check if string begins with double comma
 890                                    since that would mean the password really
 891                                    does start with a comma, and would not
 892                                    indicate an empty string */
 893                                 if (value[1] != separator[0]) {
 894                                         vol->password = NULL;
 895                                         continue;
 896                                 }
 897                         }
 898                         temp_len = strlen(value);
 899                         /* removed password length check, NTLM passwords
 900                                 can be arbitrarily long */
 901
 902                         /* if comma in password, the string will be
 903                         prematurely null terminated.  Commas in password are
 904                         specified across the cifs mount interface by a double
 905                         comma ie ,, and a comma used as in other cases ie ','
 906                         as a parameter delimiter/separator is single and due
 907                         to the strsep above is temporarily zeroed. */
 908
 909                         /* NB: password legally can have multiple commas and
 910                         the only illegal character in a password is null */
 911
 912                         if ((value[temp_len] == 0) &&
 913                             (value[temp_len+1] == separator[0])) {
 914                                 /* reinsert comma */
 915                                 value[temp_len] = separator[0];
 916                                 temp_len += 2;  /* move after second comma */
 917                                 while (value[temp_len] != 0)  {
 918                                         if (value[temp_len] == separator[0]) {
 919                                                 if (value[temp_len+1] ==
 920                                                      separator[0]) {
 921                                                 /* skip second comma */
 922                                                         temp_len++;
 923                                                 } else {
 924                                                 /* single comma indicating start
 925                                                          of next parm */
 926                                                         break;
 927                                                 }
 928                                         }
 929                                         temp_len++;
 930                                 }
 931                                 if (value[temp_len] == 0) {
 932                                         options = NULL;
 933                                 } else {
 934                                         value[temp_len] = 0;
 935                                         /* point option to start of next parm */
 936                                         options = value + temp_len + 1;
 937                                 }
 938                                 /* go from value to value + temp_len condensing
 939                                 double commas to singles. Note that this ends up
 940                                 allocating a few bytes too many, which is ok */
 941                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 942                                 if (vol->password == NULL) {
 943                                         printk(KERN_WARNING "CIFS: no memory "
 944                                                             "for password\n");
 945                                         return 1;
 946                                 }
 947                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 948                                         vol->password[j] = value[i];
 949                                         if (value[i] == separator[0]
 950                                                 && value[i+1] == separator[0]) {
 951                                                 /* skip second comma */
 952                                                 i++;
 953                                         }
 954                                 }
 955                                 vol->password[j] = 0;
 956                         } else {
 957                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 958                                 if (vol->password == NULL) {
 959                                         printk(KERN_WARNING "CIFS: no memory "
 960                                                             "for password\n");
 961                                         return 1;
 962                                 }
 963                                 strcpy(vol->password, value);
 964                         }
 965                 } else if (!strnicmp(data, "ip", 2) ||
 966                            !strnicmp(data, "addr", 4)) {
 967                         if (!value || !*value) {
 968                                 vol->UNCip = NULL;
 969                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 970                                                         INET6_ADDRSTRLEN) {
 971                                 vol->UNCip = value;
 972                         } else {
 973                                 printk(KERN_WARNING "CIFS: ip address "
 974                                                     "too long\n");
 975                                 return 1;
 976                         }
 977                 } else if (strnicmp(data, "sec", 3) == 0) {
 978                         if (!value || !*value) {
 979                                 cERROR(1, "no security value specified");
 980                                 continue;
 981                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 982                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 983                                         CIFSSEC_MUST_SIGN;
 984                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 985                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 986                                         CIFSSEC_MAY_KRB5; */
 987                                 cERROR(1, "Krb5 cifs privacy not supported");
 988                                 return 1;
 989                         } else if (strnicmp(value, "krb5", 4) == 0) {
 990                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 991 #ifdef CONFIG_CIFS_EXPERIMENTAL
 992                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 993                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 994                                         CIFSSEC_MUST_SIGN;
 995                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 996                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 997 #endif
 998                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 999                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1000                                         CIFSSEC_MUST_SIGN;
1001                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1002                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1003                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
1004                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
1005                                         CIFSSEC_MUST_SIGN;
1006                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1007                                 /* ntlm is default so can be turned off too */
1008                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1009                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1010                                 /* BB is there a better way to do this? */
1011                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1012 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1013                         } else if (strnicmp(value, "lanman", 6) == 0) {
1014                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1015 #endif
1016                         } else if (strnicmp(value, "none", 4) == 0) {
1017                                 vol->nullauth = 1;
1018                         } else {
1019                                 cERROR(1, "bad security option: %s", value);
1020                                 return 1;
1021                         }
1022                 } else if ((strnicmp(data, "unc", 3) == 0)
1023                            || (strnicmp(data, "target", 6) == 0)
1024                            || (strnicmp(data, "path", 4) == 0)) {
1025                         if (!value || !*value) {
1026                                 printk(KERN_WARNING "CIFS: invalid path to "
1027                                                     "network resource\n");
1028                                 return 1;       /* needs_arg; */
1029                         }
1030                         if ((temp_len = strnlen(value, 300)) < 300) {
1031                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1032                                 if (vol->UNC == NULL)
1033                                         return 1;
1034                                 strcpy(vol->UNC, value);
1035                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1036                                         vol->UNC[0] = '\\';
1037                                         vol->UNC[1] = '\\';
1038                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1039                                         printk(KERN_WARNING
1040                                                "CIFS: UNC Path does not begin "
1041                                                "with // or \\\\ \n");
1042                                         return 1;
1043                                 }
1044                         } else {
1045                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1046                                 return 1;
1047                         }
1048                 } else if ((strnicmp(data, "domain", 3) == 0)
1049                            || (strnicmp(data, "workgroup", 5) == 0)) {
1050                         if (!value || !*value) {
1051                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1052                                 return 1;       /* needs_arg; */
1053                         }
1054                         /* BB are there cases in which a comma can be valid in
1055                         a domain name and need special handling? */
1056                         if (strnlen(value, 256) < 256) {
1057                                 vol->domainname = value;
1058                                 cFYI(1, "Domain name set");
1059                         } else {
1060                                 printk(KERN_WARNING "CIFS: domain name too "
1061                                                     "long\n");
1062                                 return 1;
1063                         }
1064                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1065                         if (!value || !*value) {
1066                                 printk(KERN_WARNING
1067                                         "CIFS: invalid path prefix\n");
1068                                 return 1;       /* needs_argument */
1069                         }
1070                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1071                                 if (value[0] != '/')
1072                                         temp_len++;  /* missing leading slash */
1073                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1074                                 if (vol->prepath == NULL)
1075                                         return 1;
1076                                 if (value[0] != '/') {
1077                                         vol->prepath[0] = '/';
1078                                         strcpy(vol->prepath+1, value);
1079                                 } else
1080                                         strcpy(vol->prepath, value);
1081                                 cFYI(1, "prefix path %s", vol->prepath);
1082                         } else {
1083                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1084                                 return 1;
1085                         }
1086                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1087                         if (!value || !*value) {
1088                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1089                                                     "specified\n");
1090                                 return 1;       /* needs_arg; */
1091                         }
1092                         if (strnlen(value, 65) < 65) {
1093                                 if (strnicmp(value, "default", 7))
1094                                         vol->iocharset = value;
1095                                 /* if iocharset not set then load_nls_default
1096                                    is used by caller */
1097                                 cFYI(1, "iocharset set to %s", value);
1098                         } else {
1099                                 printk(KERN_WARNING "CIFS: iocharset name "
1100                                                     "too long.\n");
1101                                 return 1;
1102                         }
1103                 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1104                         vol->linux_uid = simple_strtoul(value, &value, 0);
1105                         uid_specified = true;
1106                 } else if (!strnicmp(data, "forceuid", 8)) {
1107                         override_uid = 1;
1108                 } else if (!strnicmp(data, "noforceuid", 10)) {
1109                         override_uid = 0;
1110                 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1111                         vol->linux_gid = simple_strtoul(value, &value, 0);
1112                         gid_specified = true;
1113                 } else if (!strnicmp(data, "forcegid", 8)) {
1114                         override_gid = 1;
1115                 } else if (!strnicmp(data, "noforcegid", 10)) {
1116                         override_gid = 0;
1117                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1118                         if (value && *value) {
1119                                 vol->file_mode =
1120                                         simple_strtoul(value, &value, 0);
1121                         }
1122                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1123                         if (value && *value) {
1124                                 vol->dir_mode =
1125                                         simple_strtoul(value, &value, 0);
1126                         }
1127                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1128                         if (value && *value) {
1129                                 vol->dir_mode =
1130                                         simple_strtoul(value, &value, 0);
1131                         }
1132                 } else if (strnicmp(data, "port", 4) == 0) {
1133                         if (value && *value) {
1134                                 vol->port =
1135                                         simple_strtoul(value, &value, 0);
1136                         }
1137                 } else if (strnicmp(data, "rsize", 5) == 0) {
1138                         if (value && *value) {
1139                                 vol->rsize =
1140                                         simple_strtoul(value, &value, 0);
1141                         }
1142                 } else if (strnicmp(data, "wsize", 5) == 0) {
1143                         if (value && *value) {
1144                                 vol->wsize =
1145                                         simple_strtoul(value, &value, 0);
1146                         }
1147                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1148                         if (!value || !*value) {
1149                                 cERROR(1, "no socket option specified");
1150                                 continue;
1151                         } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1152                                 vol->sockopt_tcp_nodelay = 1;
1153                         }
1154                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1155                         if (!value || !*value || (*value == ' ')) {
1156                                 cFYI(1, "invalid (empty) netbiosname");
1157                         } else {
1158                                 memset(vol->source_rfc1001_name, 0x20, 15);
1159                                 for (i = 0; i < 15; i++) {
1160                                 /* BB are there cases in which a comma can be
1161                                 valid in this workstation netbios name (and need
1162                                 special handling)? */
1163
1164                                 /* We do not uppercase netbiosname for user */
1165                                         if (value[i] == 0)
1166                                                 break;
1167                                         else
1168                                                 vol->source_rfc1001_name[i] =
1169                                                                 value[i];
1170                                 }
1171                                 /* The string has 16th byte zero still from
1172                                 set at top of the function  */
1173                                 if ((i == 15) && (value[i] != 0))
1174                                         printk(KERN_WARNING "CIFS: netbiosname"
1175                                                 " longer than 15 truncated.\n");
1176                         }
1177                 } else if (strnicmp(data, "servern", 7) == 0) {
1178                         /* servernetbiosname specified override *SMBSERVER */
1179                         if (!value || !*value || (*value == ' ')) {
1180                                 cFYI(1, "empty server netbiosname specified");
1181                         } else {
1182                                 /* last byte, type, is 0x20 for servr type */
1183                                 memset(vol->target_rfc1001_name, 0x20, 16);
1184
1185                                 for (i = 0; i < 15; i++) {
1186                                 /* BB are there cases in which a comma can be
1187                                    valid in this workstation netbios name
1188                                    (and need special handling)? */
1189
1190                                 /* user or mount helper must uppercase
1191                                    the netbiosname */
1192                                         if (value[i] == 0)
1193                                                 break;
1194                                         else
1195                                                 vol->target_rfc1001_name[i] =
1196                                                                 value[i];
1197                                 }
1198                                 /* The string has 16th byte zero still from
1199                                    set at top of the function  */
1200                                 if ((i == 15) && (value[i] != 0))
1201                                         printk(KERN_WARNING "CIFS: server net"
1202                                         "biosname longer than 15 truncated.\n");
1203                         }
1204                 } else if (strnicmp(data, "credentials", 4) == 0) {
1205                         /* ignore */
1206                 } else if (strnicmp(data, "version", 3) == 0) {
1207                         /* ignore */
1208                 } else if (strnicmp(data, "guest", 5) == 0) {
1209                         /* ignore */
1210                 } else if (strnicmp(data, "rw", 2) == 0) {
1211                         /* ignore */
1212                 } else if (strnicmp(data, "ro", 2) == 0) {
1213                         /* ignore */
1214                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1215                         vol->noblocksnd = 1;
1216                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1217                         vol->noautotune = 1;
1218                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1219                                    (strnicmp(data, "nosuid", 6) == 0) ||
1220                                    (strnicmp(data, "exec", 4) == 0) ||
1221                                    (strnicmp(data, "noexec", 6) == 0) ||
1222                                    (strnicmp(data, "nodev", 5) == 0) ||
1223                                    (strnicmp(data, "noauto", 6) == 0) ||
1224                                    (strnicmp(data, "dev", 3) == 0)) {
1225                         /*  The mount tool or mount.cifs helper (if present)
1226                             uses these opts to set flags, and the flags are read
1227                             by the kernel vfs layer before we get here (ie
1228                             before read super) so there is no point trying to
1229                             parse these options again and set anything and it
1230                             is ok to just ignore them */
1231                         continue;
1232                 } else if (strnicmp(data, "hard", 4) == 0) {
1233                         vol->retry = 1;
1234                 } else if (strnicmp(data, "soft", 4) == 0) {
1235                         vol->retry = 0;
1236                 } else if (strnicmp(data, "perm", 4) == 0) {
1237                         vol->noperm = 0;
1238                 } else if (strnicmp(data, "noperm", 6) == 0) {
1239                         vol->noperm = 1;
1240                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1241                         vol->remap = 1;
1242                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1243                         vol->remap = 0;
1244                 } else if (strnicmp(data, "sfu", 3) == 0) {
1245                         vol->sfu_emul = 1;
1246                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1247                         vol->sfu_emul = 0;
1248                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1249                         vol->nodfs = 1;
1250                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1251                         vol->posix_paths = 1;
1252                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1253                         vol->posix_paths = 0;
1254                 } else if (strnicmp(data, "nounix", 6) == 0) {
1255                         vol->no_linux_ext = 1;
1256                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1257                         vol->no_linux_ext = 1;
1258                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1259                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1260                         vol->nocase = 1;
1261                 } else if (strnicmp(data, "brl", 3) == 0) {
1262                         vol->nobrl =  0;
1263                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1264                            (strnicmp(data, "nolock", 6) == 0)) {
1265                         vol->nobrl =  1;
1266                         /* turn off mandatory locking in mode
1267                         if remote locking is turned off since the
1268                         local vfs will do advisory */
1269                         if (vol->file_mode ==
1270                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1271                                 vol->file_mode = S_IALLUGO;
1272                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1273                         /* will take the shorter form "forcemand" as well */
1274                         /* This mount option will force use of mandatory
1275                           (DOS/Windows style) byte range locks, instead of
1276                           using posix advisory byte range locks, even if the
1277                           Unix extensions are available and posix locks would
1278                           be supported otherwise. If Unix extensions are not
1279                           negotiated this has no effect since mandatory locks
1280                           would be used (mandatory locks is all that those
1281                           those servers support) */
1282                         vol->mand_lock = 1;
1283                 } else if (strnicmp(data, "setuids", 7) == 0) {
1284                         vol->setuids = 1;
1285                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1286                         vol->setuids = 0;
1287                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1288                         vol->dynperm = true;
1289                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1290                         vol->dynperm = false;
1291                 } else if (strnicmp(data, "nohard", 6) == 0) {
1292                         vol->retry = 0;
1293                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1294                         vol->retry = 1;
1295                 } else if (strnicmp(data, "nointr", 6) == 0) {
1296                         vol->intr = 0;
1297                 } else if (strnicmp(data, "intr", 4) == 0) {
1298                         vol->intr = 1;
1299                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1300                         vol->nostrictsync = 1;
1301                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1302                         vol->nostrictsync = 0;
1303                 } else if (strnicmp(data, "serverino", 7) == 0) {
1304                         vol->server_ino = 1;
1305                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1306                         vol->server_ino = 0;
1307                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1308                         vol->cifs_acl = 1;
1309                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1310                         vol->cifs_acl = 0;
1311                 } else if (strnicmp(data, "acl", 3) == 0) {
1312                         vol->no_psx_acl = 0;
1313                 } else if (strnicmp(data, "noacl", 5) == 0) {
1314                         vol->no_psx_acl = 1;
1315 #ifdef CONFIG_CIFS_EXPERIMENTAL
1316                 } else if (strnicmp(data, "locallease", 6) == 0) {
1317                         vol->local_lease = 1;
1318 #endif
1319                 } else if (strnicmp(data, "sign", 4) == 0) {
1320                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1321                 } else if (strnicmp(data, "seal", 4) == 0) {
1322                         /* we do not do the following in secFlags because seal
1323                            is a per tree connection (mount) not a per socket
1324                            or per-smb connection option in the protocol */
1325                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1326                         vol->seal = 1;
1327                 } else if (strnicmp(data, "direct", 6) == 0) {
1328                         vol->direct_io = 1;
1329                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1330                         vol->direct_io = 1;
1331                 } else if (strnicmp(data, "noac", 4) == 0) {
1332                         printk(KERN_WARNING "CIFS: Mount option noac not "
1333                                 "supported. Instead set "
1334                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1335                 } else
1336                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1337                                                 data);
1338         }
1339         if (vol->UNC == NULL) {
1340                 if (devname == NULL) {
1341                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1342                                                 "target\n");
1343                         return 1;
1344                 }
1345                 if ((temp_len = strnlen(devname, 300)) < 300) {
1346                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1347                         if (vol->UNC == NULL)
1348                                 return 1;
1349                         strcpy(vol->UNC, devname);
1350                         if (strncmp(vol->UNC, "//", 2) == 0) {
1351                                 vol->UNC[0] = '\\';
1352                                 vol->UNC[1] = '\\';
1353                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1354                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1355                                                     "begin with // or \\\\ \n");
1356                                 return 1;
1357                         }
1358                         value = strpbrk(vol->UNC+2, "/\\");
1359                         if (value)
1360                                 *value = '\\';
1361                 } else {
1362                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1363                         return 1;
1364                 }
1365         }
1366         if (vol->UNCip == NULL)
1367                 vol->UNCip = &vol->UNC[2];
1368
1369         if (uid_specified)
1370                 vol->override_uid = override_uid;
1371         else if (override_uid == 1)
1372                 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1373                                    "specified with no uid= option.\n");
1374
1375         if (gid_specified)
1376                 vol->override_gid = override_gid;
1377         else if (override_gid == 1)
1378                 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1379                                    "specified with no gid= option.\n");
1380
1381         return 0;
1382 }
1383
1384 static struct TCP_Server_Info *
1385 cifs_find_tcp_session(struct sockaddr_storage *addr, unsigned short int port)
1386 {
1387         struct list_head *tmp;
1388         struct TCP_Server_Info *server;
1389         struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1390         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1391
1392         write_lock(&cifs_tcp_ses_lock);
1393         list_for_each(tmp, &cifs_tcp_ses_list) {
1394                 server = list_entry(tmp, struct TCP_Server_Info,
1395                                     tcp_ses_list);
1396                 /*
1397                  * the demux thread can exit on its own while still in CifsNew
1398                  * so don't accept any sockets in that state. Since the
1399                  * tcpStatus never changes back to CifsNew it's safe to check
1400                  * for this without a lock.
1401                  */
1402                 if (server->tcpStatus == CifsNew)
1403                         continue;
1404
1405                 switch (addr->ss_family) {
1406                 case AF_INET:
1407                         if (addr4->sin_addr.s_addr ==
1408                             server->addr.sockAddr.sin_addr.s_addr) {
1409                                 addr4->sin_port = htons(port);
1410                                 /* user overrode default port? */
1411                                 if (addr4->sin_port) {
1412                                         if (addr4->sin_port !=
1413                                             server->addr.sockAddr.sin_port)
1414                                                 continue;
1415                                 }
1416                                 break;
1417                         } else
1418                                 continue;
1419
1420                 case AF_INET6:
1421                         if (ipv6_addr_equal(&addr6->sin6_addr,
1422                             &server->addr.sockAddr6.sin6_addr) &&
1423                             (addr6->sin6_scope_id ==
1424                             server->addr.sockAddr6.sin6_scope_id)) {
1425                                 addr6->sin6_port = htons(port);
1426                                 /* user overrode default port? */
1427                                 if (addr6->sin6_port) {
1428                                         if (addr6->sin6_port !=
1429                                            server->addr.sockAddr6.sin6_port)
1430                                                 continue;
1431                                 }
1432                                 break;
1433                         } else
1434                                 continue;
1435                 }
1436
1437                 ++server->srv_count;
1438                 write_unlock(&cifs_tcp_ses_lock);
1439                 cFYI(1, "Existing tcp session with server found");
1440                 return server;
1441         }
1442         write_unlock(&cifs_tcp_ses_lock);
1443         return NULL;
1444 }
1445
1446 static void
1447 cifs_put_tcp_session(struct TCP_Server_Info *server)
1448 {
1449         struct task_struct *task;
1450
1451         write_lock(&cifs_tcp_ses_lock);
1452         if (--server->srv_count > 0) {
1453                 write_unlock(&cifs_tcp_ses_lock);
1454                 return;
1455         }
1456
1457         list_del_init(&server->tcp_ses_list);
1458         write_unlock(&cifs_tcp_ses_lock);
1459
1460         spin_lock(&GlobalMid_Lock);
1461         server->tcpStatus = CifsExiting;
1462         spin_unlock(&GlobalMid_Lock);
1463
1464         cifs_fscache_release_client_cookie(server);
1465
1466         task = xchg(&server->tsk, NULL);
1467         if (task)
1468                 force_sig(SIGKILL, task);
1469 }
1470
1471 static struct TCP_Server_Info *
1472 cifs_get_tcp_session(struct smb_vol *volume_info)
1473 {
1474         struct TCP_Server_Info *tcp_ses = NULL;
1475         struct sockaddr_storage addr;
1476         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1477         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1478         int rc;
1479
1480         memset(&addr, 0, sizeof(struct sockaddr_storage));
1481
1482         cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1483
1484         if (volume_info->UNCip && volume_info->UNC) {
1485                 rc = cifs_convert_address(volume_info->UNCip, &addr);
1486                 if (!rc) {
1487                         /* we failed translating address */
1488                         rc = -EINVAL;
1489                         goto out_err;
1490                 }
1491         } else if (volume_info->UNCip) {
1492                 /* BB using ip addr as tcp_ses name to connect to the
1493                    DFS root below */
1494                 cERROR(1, "Connecting to DFS root not implemented yet");
1495                 rc = -EINVAL;
1496                 goto out_err;
1497         } else /* which tcp_sess DFS root would we conect to */ {
1498                 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1499                         "unc=//192.168.1.100/public) specified");
1500                 rc = -EINVAL;
1501                 goto out_err;
1502         }
1503
1504         /* see if we already have a matching tcp_ses */
1505         tcp_ses = cifs_find_tcp_session(&addr, volume_info->port);
1506         if (tcp_ses)
1507                 return tcp_ses;
1508
1509         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1510         if (!tcp_ses) {
1511                 rc = -ENOMEM;
1512                 goto out_err;
1513         }
1514
1515         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1516         if (IS_ERR(tcp_ses->hostname)) {
1517                 rc = PTR_ERR(tcp_ses->hostname);
1518                 goto out_err;
1519         }
1520
1521         tcp_ses->noblocksnd = volume_info->noblocksnd;
1522         tcp_ses->noautotune = volume_info->noautotune;
1523         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1524         atomic_set(&tcp_ses->inFlight, 0);
1525         init_waitqueue_head(&tcp_ses->response_q);
1526         init_waitqueue_head(&tcp_ses->request_q);
1527         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1528         mutex_init(&tcp_ses->srv_mutex);
1529         memcpy(tcp_ses->workstation_RFC1001_name,
1530                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1531         memcpy(tcp_ses->server_RFC1001_name,
1532                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1533         tcp_ses->sequence_number = 0;
1534         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1535         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1536
1537         /*
1538          * at this point we are the only ones with the pointer
1539          * to the struct since the kernel thread not created yet
1540          * no need to spinlock this init of tcpStatus or srv_count
1541          */
1542         tcp_ses->tcpStatus = CifsNew;
1543         ++tcp_ses->srv_count;
1544
1545         if (addr.ss_family == AF_INET6) {
1546                 cFYI(1, "attempting ipv6 connect");
1547                 /* BB should we allow ipv6 on port 139? */
1548                 /* other OS never observed in Wild doing 139 with v6 */
1549                 sin_server6->sin6_port = htons(volume_info->port);
1550                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1551                         sizeof(struct sockaddr_in6));
1552                 rc = ipv6_connect(tcp_ses);
1553         } else {
1554                 sin_server->sin_port = htons(volume_info->port);
1555                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1556                         sizeof(struct sockaddr_in));
1557                 rc = ipv4_connect(tcp_ses);
1558         }
1559         if (rc < 0) {
1560                 cERROR(1, "Error connecting to socket. Aborting operation");
1561                 goto out_err;
1562         }
1563
1564         /*
1565          * since we're in a cifs function already, we know that
1566          * this will succeed. No need for try_module_get().
1567          */
1568         __module_get(THIS_MODULE);
1569         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1570                                   tcp_ses, "cifsd");
1571         if (IS_ERR(tcp_ses->tsk)) {
1572                 rc = PTR_ERR(tcp_ses->tsk);
1573                 cERROR(1, "error %d create cifsd thread", rc);
1574                 module_put(THIS_MODULE);
1575                 goto out_err;
1576         }
1577
1578         /* thread spawned, put it on the list */
1579         write_lock(&cifs_tcp_ses_lock);
1580         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1581         write_unlock(&cifs_tcp_ses_lock);
1582
1583         cifs_fscache_get_client_cookie(tcp_ses);
1584
1585         return tcp_ses;
1586
1587 out_err:
1588         if (tcp_ses) {
1589                 if (!IS_ERR(tcp_ses->hostname))
1590                         kfree(tcp_ses->hostname);
1591                 if (tcp_ses->ssocket)
1592                         sock_release(tcp_ses->ssocket);
1593                 kfree(tcp_ses);
1594         }
1595         return ERR_PTR(rc);
1596 }
1597
1598 static struct cifsSesInfo *
1599 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1600 {
1601         struct list_head *tmp;
1602         struct cifsSesInfo *ses;
1603
1604         write_lock(&cifs_tcp_ses_lock);
1605         list_for_each(tmp, &server->smb_ses_list) {
1606                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1607                 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1608                         continue;
1609
1610                 ++ses->ses_count;
1611                 write_unlock(&cifs_tcp_ses_lock);
1612                 return ses;
1613         }
1614         write_unlock(&cifs_tcp_ses_lock);
1615         return NULL;
1616 }
1617
1618 static void
1619 cifs_put_smb_ses(struct cifsSesInfo *ses)
1620 {
1621         int xid;
1622         struct TCP_Server_Info *server = ses->server;
1623
1624         cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1625         write_lock(&cifs_tcp_ses_lock);
1626         if (--ses->ses_count > 0) {
1627                 write_unlock(&cifs_tcp_ses_lock);
1628                 return;
1629         }
1630
1631         list_del_init(&ses->smb_ses_list);
1632         write_unlock(&cifs_tcp_ses_lock);
1633
1634         if (ses->status == CifsGood) {
1635                 xid = GetXid();
1636                 CIFSSMBLogoff(xid, ses);
1637                 _FreeXid(xid);
1638         }
1639         sesInfoFree(ses);
1640         cifs_put_tcp_session(server);
1641 }
1642
1643 static struct cifsSesInfo *
1644 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1645 {
1646         int rc = -ENOMEM, xid;
1647         struct cifsSesInfo *ses;
1648
1649         xid = GetXid();
1650
1651         ses = cifs_find_smb_ses(server, volume_info->username);
1652         if (ses) {
1653                 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1654
1655                 /* existing SMB ses has a server reference already */
1656                 cifs_put_tcp_session(server);
1657
1658                 mutex_lock(&ses->session_mutex);
1659                 rc = cifs_negotiate_protocol(xid, ses);
1660                 if (rc) {
1661                         mutex_unlock(&ses->session_mutex);
1662                         /* problem -- put our ses reference */
1663                         cifs_put_smb_ses(ses);
1664                         FreeXid(xid);
1665                         return ERR_PTR(rc);
1666                 }
1667                 if (ses->need_reconnect) {
1668                         cFYI(1, "Session needs reconnect");
1669                         rc = cifs_setup_session(xid, ses,
1670                                                 volume_info->local_nls);
1671                         if (rc) {
1672                                 mutex_unlock(&ses->session_mutex);
1673                                 /* problem -- put our reference */
1674                                 cifs_put_smb_ses(ses);
1675                                 FreeXid(xid);
1676                                 return ERR_PTR(rc);
1677                         }
1678                 }
1679                 mutex_unlock(&ses->session_mutex);
1680                 FreeXid(xid);
1681                 return ses;
1682         }
1683
1684         cFYI(1, "Existing smb sess not found");
1685         ses = sesInfoAlloc();
1686         if (ses == NULL)
1687                 goto get_ses_fail;
1688
1689         /* new SMB session uses our server ref */
1690         ses->server = server;
1691         if (server->addr.sockAddr6.sin6_family == AF_INET6)
1692                 sprintf(ses->serverName, "%pI6",
1693                         &server->addr.sockAddr6.sin6_addr);
1694         else
1695                 sprintf(ses->serverName, "%pI4",
1696                         &server->addr.sockAddr.sin_addr.s_addr);
1697
1698         if (volume_info->username)
1699                 strncpy(ses->userName, volume_info->username,
1700                         MAX_USERNAME_SIZE);
1701
1702         /* volume_info->password freed at unmount */
1703         if (volume_info->password) {
1704                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1705                 if (!ses->password)
1706                         goto get_ses_fail;
1707         }
1708         if (volume_info->domainname) {
1709                 int len = strlen(volume_info->domainname);
1710                 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1711                 if (ses->domainName)
1712                         strcpy(ses->domainName, volume_info->domainname);
1713         }
1714         ses->linux_uid = volume_info->linux_uid;
1715         ses->overrideSecFlg = volume_info->secFlg;
1716
1717         mutex_lock(&ses->session_mutex);
1718         rc = cifs_negotiate_protocol(xid, ses);
1719         if (!rc)
1720                 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1721         mutex_unlock(&ses->session_mutex);
1722         if (rc)
1723                 goto get_ses_fail;
1724
1725         /* success, put it on the list */
1726         write_lock(&cifs_tcp_ses_lock);
1727         list_add(&ses->smb_ses_list, &server->smb_ses_list);
1728         write_unlock(&cifs_tcp_ses_lock);
1729
1730         FreeXid(xid);
1731         return ses;
1732
1733 get_ses_fail:
1734         sesInfoFree(ses);
1735         FreeXid(xid);
1736         return ERR_PTR(rc);
1737 }
1738
1739 static struct cifsTconInfo *
1740 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1741 {
1742         struct list_head *tmp;
1743         struct cifsTconInfo *tcon;
1744
1745         write_lock(&cifs_tcp_ses_lock);
1746         list_for_each(tmp, &ses->tcon_list) {
1747                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1748                 if (tcon->tidStatus == CifsExiting)
1749                         continue;
1750                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1751                         continue;
1752
1753                 ++tcon->tc_count;
1754                 write_unlock(&cifs_tcp_ses_lock);
1755                 return tcon;
1756         }
1757         write_unlock(&cifs_tcp_ses_lock);
1758         return NULL;
1759 }
1760
1761 static void
1762 cifs_put_tcon(struct cifsTconInfo *tcon)
1763 {
1764         int xid;
1765         struct cifsSesInfo *ses = tcon->ses;
1766
1767         cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1768         write_lock(&cifs_tcp_ses_lock);
1769         if (--tcon->tc_count > 0) {
1770                 write_unlock(&cifs_tcp_ses_lock);
1771                 return;
1772         }
1773
1774         list_del_init(&tcon->tcon_list);
1775         write_unlock(&cifs_tcp_ses_lock);
1776
1777         xid = GetXid();
1778         CIFSSMBTDis(xid, tcon);
1779         _FreeXid(xid);
1780
1781         tconInfoFree(tcon);
1782         cifs_put_smb_ses(ses);
1783 }
1784
1785 static struct cifsTconInfo *
1786 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1787 {
1788         int rc, xid;
1789         struct cifsTconInfo *tcon;
1790
1791         tcon = cifs_find_tcon(ses, volume_info->UNC);
1792         if (tcon) {
1793                 cFYI(1, "Found match on UNC path");
1794                 /* existing tcon already has a reference */
1795                 cifs_put_smb_ses(ses);
1796                 if (tcon->seal != volume_info->seal)
1797                         cERROR(1, "transport encryption setting "
1798                                    "conflicts with existing tid");
1799                 return tcon;
1800         }
1801
1802         tcon = tconInfoAlloc();
1803         if (tcon == NULL) {
1804                 rc = -ENOMEM;
1805                 goto out_fail;
1806         }
1807
1808         tcon->ses = ses;
1809         if (volume_info->password) {
1810                 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1811                 if (!tcon->password) {
1812                         rc = -ENOMEM;
1813                         goto out_fail;
1814                 }
1815         }
1816
1817         if (strchr(volume_info->UNC + 3, '\\') == NULL
1818             && strchr(volume_info->UNC + 3, '/') == NULL) {
1819                 cERROR(1, "Missing share name");
1820                 rc = -ENODEV;
1821                 goto out_fail;
1822         }
1823
1824         /* BB Do we need to wrap session_mutex around
1825          * this TCon call and Unix SetFS as
1826          * we do on SessSetup and reconnect? */
1827         xid = GetXid();
1828         rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1829         FreeXid(xid);
1830         cFYI(1, "CIFS Tcon rc = %d", rc);
1831         if (rc)
1832                 goto out_fail;
1833
1834         if (volume_info->nodfs) {
1835                 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1836                 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1837         }
1838         tcon->seal = volume_info->seal;
1839         /* we can have only one retry value for a connection
1840            to a share so for resources mounted more than once
1841            to the same server share the last value passed in
1842            for the retry flag is used */
1843         tcon->retry = volume_info->retry;
1844         tcon->nocase = volume_info->nocase;
1845         tcon->local_lease = volume_info->local_lease;
1846
1847         write_lock(&cifs_tcp_ses_lock);
1848         list_add(&tcon->tcon_list, &ses->tcon_list);
1849         write_unlock(&cifs_tcp_ses_lock);
1850
1851         return tcon;
1852
1853 out_fail:
1854         tconInfoFree(tcon);
1855         return ERR_PTR(rc);
1856 }
1857
1858
1859 int
1860 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1861              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1862              struct dfs_info3_param **preferrals, int remap)
1863 {
1864         char *temp_unc;
1865         int rc = 0;
1866
1867         *pnum_referrals = 0;
1868         *preferrals = NULL;
1869
1870         if (pSesInfo->ipc_tid == 0) {
1871                 temp_unc = kmalloc(2 /* for slashes */ +
1872                         strnlen(pSesInfo->serverName,
1873                                 SERVER_NAME_LEN_WITH_NULL * 2)
1874                                  + 1 + 4 /* slash IPC$ */  + 2,
1875                                 GFP_KERNEL);
1876                 if (temp_unc == NULL)
1877                         return -ENOMEM;
1878                 temp_unc[0] = '\\';
1879                 temp_unc[1] = '\\';
1880                 strcpy(temp_unc + 2, pSesInfo->serverName);
1881                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1882                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1883                 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1884                 kfree(temp_unc);
1885         }
1886         if (rc == 0)
1887                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1888                                      pnum_referrals, nls_codepage, remap);
1889         /* BB map targetUNCs to dfs_info3 structures, here or
1890                 in CIFSGetDFSRefer BB */
1891
1892         return rc;
1893 }
1894
1895 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1896 static struct lock_class_key cifs_key[2];
1897 static struct lock_class_key cifs_slock_key[2];
1898
1899 static inline void
1900 cifs_reclassify_socket4(struct socket *sock)
1901 {
1902         struct sock *sk = sock->sk;
1903         BUG_ON(sock_owned_by_user(sk));
1904         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1905                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1906 }
1907
1908 static inline void
1909 cifs_reclassify_socket6(struct socket *sock)
1910 {
1911         struct sock *sk = sock->sk;
1912         BUG_ON(sock_owned_by_user(sk));
1913         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1914                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1915 }
1916 #else
1917 static inline void
1918 cifs_reclassify_socket4(struct socket *sock)
1919 {
1920 }
1921
1922 static inline void
1923 cifs_reclassify_socket6(struct socket *sock)
1924 {
1925 }
1926 #endif
1927
1928 /* See RFC1001 section 14 on representation of Netbios names */
1929 static void rfc1002mangle(char *target, char *source, unsigned int length)
1930 {
1931         unsigned int i, j;
1932
1933         for (i = 0, j = 0; i < (length); i++) {
1934                 /* mask a nibble at a time and encode */
1935                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1936                 target[j+1] = 'A' + (0x0F & source[i]);
1937                 j += 2;
1938         }
1939
1940 }
1941
1942
1943 static int
1944 ipv4_connect(struct TCP_Server_Info *server)
1945 {
1946         int rc = 0;
1947         int val;
1948         bool connected = false;
1949         __be16 orig_port = 0;
1950         struct socket *socket = server->ssocket;
1951
1952         if (socket == NULL) {
1953                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1954                                       IPPROTO_TCP, &socket);
1955                 if (rc < 0) {
1956                         cERROR(1, "Error %d creating socket", rc);
1957                         return rc;
1958                 }
1959
1960                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1961                 cFYI(1, "Socket created");
1962                 server->ssocket = socket;
1963                 socket->sk->sk_allocation = GFP_NOFS;
1964                 cifs_reclassify_socket4(socket);
1965         }
1966
1967         /* user overrode default port */
1968         if (server->addr.sockAddr.sin_port) {
1969                 rc = socket->ops->connect(socket, (struct sockaddr *)
1970                                           &server->addr.sockAddr,
1971                                           sizeof(struct sockaddr_in), 0);
1972                 if (rc >= 0)
1973                         connected = true;
1974         }
1975
1976         if (!connected) {
1977                 /* save original port so we can retry user specified port
1978                         later if fall back ports fail this time  */
1979                 orig_port = server->addr.sockAddr.sin_port;
1980
1981                 /* do not retry on the same port we just failed on */
1982                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1983                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1984                         rc = socket->ops->connect(socket,
1985                                                 (struct sockaddr *)
1986                                                 &server->addr.sockAddr,
1987                                                 sizeof(struct sockaddr_in), 0);
1988                         if (rc >= 0)
1989                                 connected = true;
1990                 }
1991         }
1992         if (!connected) {
1993                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1994                 rc = socket->ops->connect(socket, (struct sockaddr *)
1995                                               &server->addr.sockAddr,
1996                                               sizeof(struct sockaddr_in), 0);
1997                 if (rc >= 0)
1998                         connected = true;
1999         }
2000
2001         /* give up here - unless we want to retry on different
2002                 protocol families some day */
2003         if (!connected) {
2004                 if (orig_port)
2005                         server->addr.sockAddr.sin_port = orig_port;
2006                 cFYI(1, "Error %d connecting to server via ipv4", rc);
2007                 sock_release(socket);
2008                 server->ssocket = NULL;
2009                 return rc;
2010         }
2011
2012
2013         /*
2014          * Eventually check for other socket options to change from
2015          *  the default. sock_setsockopt not used because it expects
2016          *  user space buffer
2017          */
2018         socket->sk->sk_rcvtimeo = 7 * HZ;
2019         socket->sk->sk_sndtimeo = 5 * HZ;
2020
2021         /* make the bufsizes depend on wsize/rsize and max requests */
2022         if (server->noautotune) {
2023                 if (socket->sk->sk_sndbuf < (200 * 1024))
2024                         socket->sk->sk_sndbuf = 200 * 1024;
2025                 if (socket->sk->sk_rcvbuf < (140 * 1024))
2026                         socket->sk->sk_rcvbuf = 140 * 1024;
2027         }
2028
2029         if (server->tcp_nodelay) {
2030                 val = 1;
2031                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2032                                 (char *)&val, sizeof(val));
2033                 if (rc)
2034                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2035         }
2036
2037          cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2038                  socket->sk->sk_sndbuf,
2039                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2040
2041         /* send RFC1001 sessinit */
2042         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2043                 /* some servers require RFC1001 sessinit before sending
2044                 negprot - BB check reconnection in case where second
2045                 sessinit is sent but no second negprot */
2046                 struct rfc1002_session_packet *ses_init_buf;
2047                 struct smb_hdr *smb_buf;
2048                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2049                                        GFP_KERNEL);
2050                 if (ses_init_buf) {
2051                         ses_init_buf->trailer.session_req.called_len = 32;
2052                         if (server->server_RFC1001_name &&
2053                             server->server_RFC1001_name[0] != 0)
2054                                 rfc1002mangle(ses_init_buf->trailer.
2055                                                 session_req.called_name,
2056                                               server->server_RFC1001_name,
2057                                               RFC1001_NAME_LEN_WITH_NULL);
2058                         else
2059                                 rfc1002mangle(ses_init_buf->trailer.
2060                                                 session_req.called_name,
2061                                               DEFAULT_CIFS_CALLED_NAME,
2062                                               RFC1001_NAME_LEN_WITH_NULL);
2063
2064                         ses_init_buf->trailer.session_req.calling_len = 32;
2065
2066                         /* calling name ends in null (byte 16) from old smb
2067                         convention. */
2068                         if (server->workstation_RFC1001_name &&
2069                             server->workstation_RFC1001_name[0] != 0)
2070                                 rfc1002mangle(ses_init_buf->trailer.
2071                                                 session_req.calling_name,
2072                                               server->workstation_RFC1001_name,
2073                                               RFC1001_NAME_LEN_WITH_NULL);
2074                         else
2075                                 rfc1002mangle(ses_init_buf->trailer.
2076                                                 session_req.calling_name,
2077                                               "LINUX_CIFS_CLNT",
2078                                               RFC1001_NAME_LEN_WITH_NULL);
2079
2080                         ses_init_buf->trailer.session_req.scope1 = 0;
2081                         ses_init_buf->trailer.session_req.scope2 = 0;
2082                         smb_buf = (struct smb_hdr *)ses_init_buf;
2083                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
2084                         smb_buf->smb_buf_length = 0x81000044;
2085                         rc = smb_send(server, smb_buf, 0x44);
2086                         kfree(ses_init_buf);
2087                         msleep(1); /* RFC1001 layer in at least one server
2088                                       requires very short break before negprot
2089                                       presumably because not expecting negprot
2090                                       to follow so fast.  This is a simple
2091                                       solution that works without
2092                                       complicating the code and causes no
2093                                       significant slowing down on mount
2094                                       for everyone else */
2095                 }
2096                 /* else the negprot may still work without this
2097                 even though malloc failed */
2098
2099         }
2100
2101         return rc;
2102 }
2103
2104 static int
2105 ipv6_connect(struct TCP_Server_Info *server)
2106 {
2107         int rc = 0;
2108         int val;
2109         bool connected = false;
2110         __be16 orig_port = 0;
2111         struct socket *socket = server->ssocket;
2112
2113         if (socket == NULL) {
2114                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2115                                       IPPROTO_TCP, &socket);
2116                 if (rc < 0) {
2117                         cERROR(1, "Error %d creating ipv6 socket", rc);
2118                         socket = NULL;
2119                         return rc;
2120                 }
2121
2122                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2123                 cFYI(1, "ipv6 Socket created");
2124                 server->ssocket = socket;
2125                 socket->sk->sk_allocation = GFP_NOFS;
2126                 cifs_reclassify_socket6(socket);
2127         }
2128
2129         /* user overrode default port */
2130         if (server->addr.sockAddr6.sin6_port) {
2131                 rc = socket->ops->connect(socket,
2132                                 (struct sockaddr *) &server->addr.sockAddr6,
2133                                 sizeof(struct sockaddr_in6), 0);
2134                 if (rc >= 0)
2135                         connected = true;
2136         }
2137
2138         if (!connected) {
2139                 /* save original port so we can retry user specified port
2140                         later if fall back ports fail this time  */
2141
2142                 orig_port = server->addr.sockAddr6.sin6_port;
2143                 /* do not retry on the same port we just failed on */
2144                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2145                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2146                         rc = socket->ops->connect(socket, (struct sockaddr *)
2147                                         &server->addr.sockAddr6,
2148                                         sizeof(struct sockaddr_in6), 0);
2149                         if (rc >= 0)
2150                                 connected = true;
2151                 }
2152         }
2153         if (!connected) {
2154                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2155                 rc = socket->ops->connect(socket, (struct sockaddr *)
2156                                 &server->addr.sockAddr6,
2157                                 sizeof(struct sockaddr_in6), 0);
2158                 if (rc >= 0)
2159                         connected = true;
2160         }
2161
2162         /* give up here - unless we want to retry on different
2163                 protocol families some day */
2164         if (!connected) {
2165                 if (orig_port)
2166                         server->addr.sockAddr6.sin6_port = orig_port;
2167                 cFYI(1, "Error %d connecting to server via ipv6", rc);
2168                 sock_release(socket);
2169                 server->ssocket = NULL;
2170                 return rc;
2171         }
2172
2173         /*
2174          * Eventually check for other socket options to change from
2175          * the default. sock_setsockopt not used because it expects
2176          * user space buffer
2177          */
2178         socket->sk->sk_rcvtimeo = 7 * HZ;
2179         socket->sk->sk_sndtimeo = 5 * HZ;
2180
2181         if (server->tcp_nodelay) {
2182                 val = 1;
2183                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2184                                 (char *)&val, sizeof(val));
2185                 if (rc)
2186                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2187         }
2188
2189         server->ssocket = socket;
2190
2191         return rc;
2192 }
2193
2194 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2195                           struct super_block *sb, struct smb_vol *vol_info)
2196 {
2197         /* if we are reconnecting then should we check to see if
2198          * any requested capabilities changed locally e.g. via
2199          * remount but we can not do much about it here
2200          * if they have (even if we could detect it by the following)
2201          * Perhaps we could add a backpointer to array of sb from tcon
2202          * or if we change to make all sb to same share the same
2203          * sb as NFS - then we only have one backpointer to sb.
2204          * What if we wanted to mount the server share twice once with
2205          * and once without posixacls or posix paths? */
2206         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2207
2208         if (vol_info && vol_info->no_linux_ext) {
2209                 tcon->fsUnixInfo.Capability = 0;
2210                 tcon->unix_ext = 0; /* Unix Extensions disabled */
2211                 cFYI(1, "Linux protocol extensions disabled");
2212                 return;
2213         } else if (vol_info)
2214                 tcon->unix_ext = 1; /* Unix Extensions supported */
2215
2216         if (tcon->unix_ext == 0) {
2217                 cFYI(1, "Unix extensions disabled so not set on reconnect");
2218                 return;
2219         }
2220
2221         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2222                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2223
2224                 /* check for reconnect case in which we do not
2225                    want to change the mount behavior if we can avoid it */
2226                 if (vol_info == NULL) {
2227                         /* turn off POSIX ACL and PATHNAMES if not set
2228                            originally at mount time */
2229                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2230                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2231                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2232                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2233                                         cERROR(1, "POSIXPATH support change");
2234                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2235                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2236                                 cERROR(1, "possible reconnect error");
2237                                 cERROR(1, "server disabled POSIX path support");
2238                         }
2239                 }
2240
2241                 cap &= CIFS_UNIX_CAP_MASK;
2242                 if (vol_info && vol_info->no_psx_acl)
2243                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2244                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2245                         cFYI(1, "negotiated posix acl support");
2246                         if (sb)
2247                                 sb->s_flags |= MS_POSIXACL;
2248                 }
2249
2250                 if (vol_info && vol_info->posix_paths == 0)
2251                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2252                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2253                         cFYI(1, "negotiate posix pathnames");
2254                         if (sb)
2255                                 CIFS_SB(sb)->mnt_cifs_flags |=
2256                                         CIFS_MOUNT_POSIX_PATHS;
2257                 }
2258
2259                 /* We might be setting the path sep back to a different
2260                 form if we are reconnecting and the server switched its
2261                 posix path capability for this share */
2262                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2263                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2264
2265                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2266                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2267                                 CIFS_SB(sb)->rsize = 127 * 1024;
2268                                 cFYI(DBG2, "larger reads not supported by srv");
2269                         }
2270                 }
2271
2272
2273                 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2274 #ifdef CONFIG_CIFS_DEBUG2
2275                 if (cap & CIFS_UNIX_FCNTL_CAP)
2276                         cFYI(1, "FCNTL cap");
2277                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2278                         cFYI(1, "EXTATTR cap");
2279                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2280                         cFYI(1, "POSIX path cap");
2281                 if (cap & CIFS_UNIX_XATTR_CAP)
2282                         cFYI(1, "XATTR cap");
2283                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2284                         cFYI(1, "POSIX ACL cap");
2285                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2286                         cFYI(1, "very large read cap");
2287                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2288                         cFYI(1, "very large write cap");
2289 #endif /* CIFS_DEBUG2 */
2290                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2291                         if (vol_info == NULL) {
2292                                 cFYI(1, "resetting capabilities failed");
2293                         } else
2294                                 cERROR(1, "Negotiating Unix capabilities "
2295                                            "with the server failed.  Consider "
2296                                            "mounting with the Unix Extensions\n"
2297                                            "disabled, if problems are found, "
2298                                            "by specifying the nounix mount "
2299                                            "option.");
2300
2301                 }
2302         }
2303 }
2304
2305 static void
2306 convert_delimiter(char *path, char delim)
2307 {
2308         int i;
2309         char old_delim;
2310
2311         if (path == NULL)
2312                 return;
2313
2314         if (delim == '/')
2315                 old_delim = '\\';
2316         else
2317                 old_delim = '/';
2318
2319         for (i = 0; path[i] != '\0'; i++) {
2320                 if (path[i] == old_delim)
2321                         path[i] = delim;
2322         }
2323 }
2324
2325 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2326                           struct cifs_sb_info *cifs_sb)
2327 {
2328         if (pvolume_info->rsize > CIFSMaxBufSize) {
2329                 cERROR(1, "rsize %d too large, using MaxBufSize",
2330                         pvolume_info->rsize);
2331                 cifs_sb->rsize = CIFSMaxBufSize;
2332         } else if ((pvolume_info->rsize) &&
2333                         (pvolume_info->rsize <= CIFSMaxBufSize))
2334                 cifs_sb->rsize = pvolume_info->rsize;
2335         else /* default */
2336                 cifs_sb->rsize = CIFSMaxBufSize;
2337
2338         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2339                 cERROR(1, "wsize %d too large, using 4096 instead",
2340                           pvolume_info->wsize);
2341                 cifs_sb->wsize = 4096;
2342         } else if (pvolume_info->wsize)
2343                 cifs_sb->wsize = pvolume_info->wsize;
2344         else
2345                 cifs_sb->wsize = min_t(const int,
2346                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2347                                         127*1024);
2348                 /* old default of CIFSMaxBufSize was too small now
2349                    that SMB Write2 can send multiple pages in kvec.
2350                    RFC1001 does not describe what happens when frame
2351                    bigger than 128K is sent so use that as max in
2352                    conjunction with 52K kvec constraint on arch with 4K
2353                    page size  */
2354
2355         if (cifs_sb->rsize < 2048) {
2356                 cifs_sb->rsize = 2048;
2357                 /* Windows ME may prefer this */
2358                 cFYI(1, "readsize set to minimum: 2048");
2359         }
2360         /* calculate prepath */
2361         cifs_sb->prepath = pvolume_info->prepath;
2362         if (cifs_sb->prepath) {
2363                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2364                 /* we can not convert the / to \ in the path
2365                 separators in the prefixpath yet because we do not
2366                 know (until reset_cifs_unix_caps is called later)
2367                 whether POSIX PATH CAP is available. We normalize
2368                 the / to \ after reset_cifs_unix_caps is called */
2369                 pvolume_info->prepath = NULL;
2370         } else
2371                 cifs_sb->prepathlen = 0;
2372         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2373         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2374         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2375         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2376         cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
2377                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2378
2379         if (pvolume_info->noperm)
2380                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2381         if (pvolume_info->setuids)
2382                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2383         if (pvolume_info->server_ino)
2384                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2385         if (pvolume_info->remap)
2386                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2387         if (pvolume_info->no_xattr)
2388                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2389         if (pvolume_info->sfu_emul)
2390                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2391         if (pvolume_info->nobrl)
2392                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2393         if (pvolume_info->nostrictsync)
2394                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2395         if (pvolume_info->mand_lock)
2396                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2397         if (pvolume_info->cifs_acl)
2398                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2399         if (pvolume_info->override_uid)
2400                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2401         if (pvolume_info->override_gid)
2402                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2403         if (pvolume_info->dynperm)
2404                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2405         if (pvolume_info->direct_io) {
2406                 cFYI(1, "mounting share using direct i/o");
2407                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2408         }
2409
2410         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2411                 cERROR(1, "mount option dynperm ignored if cifsacl "
2412                            "mount option supported");
2413 }
2414
2415 static int
2416 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2417                    struct cifs_sb_info *cifs_sb, const char *full_path)
2418 {
2419         int rc;
2420         FILE_ALL_INFO *pfile_info;
2421
2422         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2423         if (pfile_info == NULL)
2424                 return -ENOMEM;
2425
2426         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2427                               0 /* not legacy */, cifs_sb->local_nls,
2428                               cifs_sb->mnt_cifs_flags &
2429                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2430         kfree(pfile_info);
2431         return rc;
2432 }
2433
2434 static void
2435 cleanup_volume_info(struct smb_vol **pvolume_info)
2436 {
2437         struct smb_vol *volume_info;
2438
2439         if (!pvolume_info || !*pvolume_info)
2440                 return;
2441
2442         volume_info = *pvolume_info;
2443         kzfree(volume_info->password);
2444         kfree(volume_info->UNC);
2445         kfree(volume_info->prepath);
2446         kfree(volume_info);
2447         *pvolume_info = NULL;
2448         return;
2449 }
2450
2451 #ifdef CONFIG_CIFS_DFS_UPCALL
2452 /* build_path_to_root returns full path to root when
2453  * we do not have an exiting connection (tcon) */
2454 static char *
2455 build_unc_path_to_root(const struct smb_vol *volume_info,
2456                 const struct cifs_sb_info *cifs_sb)
2457 {
2458         char *full_path;
2459
2460         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2461         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2462         if (full_path == NULL)
2463                 return ERR_PTR(-ENOMEM);
2464
2465         strncpy(full_path, volume_info->UNC, unc_len);
2466         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2467                 int i;
2468                 for (i = 0; i < unc_len; i++) {
2469                         if (full_path[i] == '\\')
2470                                 full_path[i] = '/';
2471                 }
2472         }
2473
2474         if (cifs_sb->prepathlen)
2475                 strncpy(full_path + unc_len, cifs_sb->prepath,
2476                                 cifs_sb->prepathlen);
2477
2478         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2479         return full_path;
2480 }
2481 #endif
2482
2483 int
2484 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2485                 char *mount_data_global, const char *devname)
2486 {
2487         int rc;
2488         int xid;
2489         struct smb_vol *volume_info;
2490         struct cifsSesInfo *pSesInfo;
2491         struct cifsTconInfo *tcon;
2492         struct TCP_Server_Info *srvTcp;
2493         char   *full_path;
2494         char *mount_data = mount_data_global;
2495 #ifdef CONFIG_CIFS_DFS_UPCALL
2496         struct dfs_info3_param *referrals = NULL;
2497         unsigned int num_referrals = 0;
2498         int referral_walks_count = 0;
2499 try_mount_again:
2500 #endif
2501         rc = 0;
2502         tcon = NULL;
2503         pSesInfo = NULL;
2504         srvTcp = NULL;
2505         full_path = NULL;
2506
2507         xid = GetXid();
2508
2509         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2510         if (!volume_info) {
2511                 rc = -ENOMEM;
2512                 goto out;
2513         }
2514
2515         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2516                 rc = -EINVAL;
2517                 goto out;
2518         }
2519
2520         if (volume_info->nullauth) {
2521                 cFYI(1, "null user");
2522                 volume_info->username = "";
2523         } else if (volume_info->username) {
2524                 /* BB fixme parse for domain name here */
2525                 cFYI(1, "Username: %s", volume_info->username);
2526         } else {
2527                 cifserror("No username specified");
2528         /* In userspace mount helper we can get user name from alternate
2529            locations such as env variables and files on disk */
2530                 rc = -EINVAL;
2531                 goto out;
2532         }
2533
2534         /* this is needed for ASCII cp to Unicode converts */
2535         if (volume_info->iocharset == NULL) {
2536                 /* load_nls_default cannot return null */
2537                 volume_info->local_nls = load_nls_default();
2538         } else {
2539                 volume_info->local_nls = load_nls(volume_info->iocharset);
2540                 if (volume_info->local_nls == NULL) {
2541                         cERROR(1, "CIFS mount error: iocharset %s not found",
2542                                  volume_info->iocharset);
2543                         rc = -ELIBACC;
2544                         goto out;
2545                 }
2546         }
2547         cifs_sb->local_nls = volume_info->local_nls;
2548
2549         /* get a reference to a tcp session */
2550         srvTcp = cifs_get_tcp_session(volume_info);
2551         if (IS_ERR(srvTcp)) {
2552                 rc = PTR_ERR(srvTcp);
2553                 goto out;
2554         }
2555
2556         /* get a reference to a SMB session */
2557         pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2558         if (IS_ERR(pSesInfo)) {
2559                 rc = PTR_ERR(pSesInfo);
2560                 pSesInfo = NULL;
2561                 goto mount_fail_check;
2562         }
2563
2564         setup_cifs_sb(volume_info, cifs_sb);
2565         if (pSesInfo->capabilities & CAP_LARGE_FILES)
2566                 sb->s_maxbytes = MAX_LFS_FILESIZE;
2567         else
2568                 sb->s_maxbytes = MAX_NON_LFS;
2569
2570         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2571         sb->s_time_gran = 100;
2572
2573         /* search for existing tcon to this server share */
2574         tcon = cifs_get_tcon(pSesInfo, volume_info);
2575         if (IS_ERR(tcon)) {
2576                 rc = PTR_ERR(tcon);
2577                 tcon = NULL;
2578                 goto remote_path_check;
2579         }
2580
2581         cifs_sb->tcon = tcon;
2582
2583         /* do not care if following two calls succeed - informational */
2584         if (!tcon->ipc) {
2585                 CIFSSMBQFSDeviceInfo(xid, tcon);
2586                 CIFSSMBQFSAttributeInfo(xid, tcon);
2587         }
2588
2589         /* tell server which Unix caps we support */
2590         if (tcon->ses->capabilities & CAP_UNIX)
2591                 /* reset of caps checks mount to see if unix extensions
2592                    disabled for just this mount */
2593                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2594         else
2595                 tcon->unix_ext = 0; /* server does not support them */
2596
2597         /* convert forward to back slashes in prepath here if needed */
2598         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2599                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2600
2601         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2602                 cifs_sb->rsize = 1024 * 127;
2603                 cFYI(DBG2, "no very large read support, rsize now 127K");
2604         }
2605         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2606                 cifs_sb->wsize = min(cifs_sb->wsize,
2607                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2608         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2609                 cifs_sb->rsize = min(cifs_sb->rsize,
2610                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2611
2612 remote_path_check:
2613         /* check if a whole path (including prepath) is not remote */
2614         if (!rc && cifs_sb->prepathlen && tcon) {
2615                 /* build_path_to_root works only when we have a valid tcon */
2616                 full_path = cifs_build_path_to_root(cifs_sb);
2617                 if (full_path == NULL) {
2618                         rc = -ENOMEM;
2619                         goto mount_fail_check;
2620                 }
2621                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2622                 if (rc != -EREMOTE) {
2623                         kfree(full_path);
2624                         goto mount_fail_check;
2625                 }
2626                 kfree(full_path);
2627         }
2628
2629         /* get referral if needed */
2630         if (rc == -EREMOTE) {
2631 #ifdef CONFIG_CIFS_DFS_UPCALL
2632                 if (referral_walks_count > MAX_NESTED_LINKS) {
2633                         /*
2634                          * BB: when we implement proper loop detection,
2635                          *     we will remove this check. But now we need it
2636                          *     to prevent an indefinite loop if 'DFS tree' is
2637                          *     misconfigured (i.e. has loops).
2638                          */
2639                         rc = -ELOOP;
2640                         goto mount_fail_check;
2641                 }
2642                 /* convert forward to back slashes in prepath here if needed */
2643                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2644                         convert_delimiter(cifs_sb->prepath,
2645                                         CIFS_DIR_SEP(cifs_sb));
2646                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2647                 if (IS_ERR(full_path)) {
2648                         rc = PTR_ERR(full_path);
2649                         goto mount_fail_check;
2650                 }
2651
2652                 cFYI(1, "Getting referral for: %s", full_path);
2653                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2654                         cifs_sb->local_nls, &num_referrals, &referrals,
2655                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2656                 if (!rc && num_referrals > 0) {
2657                         char *fake_devname = NULL;
2658
2659                         if (mount_data != mount_data_global)
2660                                 kfree(mount_data);
2661
2662                         mount_data = cifs_compose_mount_options(
2663                                         cifs_sb->mountdata, full_path + 1,
2664                                         referrals, &fake_devname);
2665
2666                         free_dfs_info_array(referrals, num_referrals);
2667                         kfree(fake_devname);
2668                         kfree(full_path);
2669
2670                         if (IS_ERR(mount_data)) {
2671                                 rc = PTR_ERR(mount_data);
2672                                 mount_data = NULL;
2673                                 goto mount_fail_check;
2674                         }
2675
2676                         if (tcon)
2677                                 cifs_put_tcon(tcon);
2678                         else if (pSesInfo)
2679                                 cifs_put_smb_ses(pSesInfo);
2680
2681                         cleanup_volume_info(&volume_info);
2682                         referral_walks_count++;
2683                         FreeXid(xid);
2684                         goto try_mount_again;
2685                 }
2686 #else /* No DFS support, return error on mount */
2687                 rc = -EOPNOTSUPP;
2688 #endif
2689         }
2690
2691 mount_fail_check:
2692         /* on error free sesinfo and tcon struct if needed */
2693         if (rc) {
2694                 if (mount_data != mount_data_global)
2695                         kfree(mount_data);
2696                 /* If find_unc succeeded then rc == 0 so we can not end */
2697                 /* up accidently freeing someone elses tcon struct */
2698                 if (tcon)
2699                         cifs_put_tcon(tcon);
2700                 else if (pSesInfo)
2701                         cifs_put_smb_ses(pSesInfo);
2702                 else
2703                         cifs_put_tcp_session(srvTcp);
2704                 goto out;
2705         }
2706
2707         /* volume_info->password is freed above when existing session found
2708         (in which case it is not needed anymore) but when new sesion is created
2709         the password ptr is put in the new session structure (in which case the
2710         password will be freed at unmount time) */
2711 out:
2712         /* zero out password before freeing */
2713         cleanup_volume_info(&volume_info);
2714         FreeXid(xid);
2715         return rc;
2716 }
2717
2718 int
2719 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2720          const char *tree, struct cifsTconInfo *tcon,
2721          const struct nls_table *nls_codepage)
2722 {
2723         struct smb_hdr *smb_buffer;
2724         struct smb_hdr *smb_buffer_response;
2725         TCONX_REQ *pSMB;
2726         TCONX_RSP *pSMBr;
2727         unsigned char *bcc_ptr;
2728         int rc = 0;
2729         int length, bytes_left;
2730         __u16 count;
2731
2732         if (ses == NULL)
2733                 return -EIO;
2734
2735         smb_buffer = cifs_buf_get();
2736         if (smb_buffer == NULL)
2737                 return -ENOMEM;
2738
2739         smb_buffer_response = smb_buffer;
2740
2741         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2742                         NULL /*no tid */ , 4 /*wct */ );
2743
2744         smb_buffer->Mid = GetNextMid(ses->server);
2745         smb_buffer->Uid = ses->Suid;
2746         pSMB = (TCONX_REQ *) smb_buffer;
2747         pSMBr = (TCONX_RSP *) smb_buffer_response;
2748
2749         pSMB->AndXCommand = 0xFF;
2750         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2751         bcc_ptr = &pSMB->Password[0];
2752         if ((ses->server->secMode) & SECMODE_USER) {
2753                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2754                 *bcc_ptr = 0; /* password is null byte */
2755                 bcc_ptr++;              /* skip password */
2756                 /* already aligned so no need to do it below */
2757         } else {
2758                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2759                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2760                    specified as required (when that support is added to
2761                    the vfs in the future) as only NTLM or the much
2762                    weaker LANMAN (which we do not send by default) is accepted
2763                    by Samba (not sure whether other servers allow
2764                    NTLMv2 password here) */
2765 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2766                 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2767                     (ses->server->secType == LANMAN))
2768                         calc_lanman_hash(tcon->password, ses->server->cryptKey,
2769                                          ses->server->secMode &
2770                                             SECMODE_PW_ENCRYPT ? true : false,
2771                                          bcc_ptr);
2772                 else
2773 #endif /* CIFS_WEAK_PW_HASH */
2774                 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2775                              bcc_ptr);
2776
2777                 bcc_ptr += CIFS_SESS_KEY_SIZE;
2778                 if (ses->capabilities & CAP_UNICODE) {
2779                         /* must align unicode strings */
2780                         *bcc_ptr = 0; /* null byte password */
2781                         bcc_ptr++;
2782                 }
2783         }
2784
2785         if (ses->server->secMode &
2786                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2787                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2788
2789         if (ses->capabilities & CAP_STATUS32) {
2790                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2791         }
2792         if (ses->capabilities & CAP_DFS) {
2793                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2794         }
2795         if (ses->capabilities & CAP_UNICODE) {
2796                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2797                 length =
2798                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2799                         6 /* max utf8 char length in bytes */ *
2800                         (/* server len*/ + 256 /* share len */), nls_codepage);
2801                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
2802                 bcc_ptr += 2;   /* skip trailing null */
2803         } else {                /* ASCII */
2804                 strcpy(bcc_ptr, tree);
2805                 bcc_ptr += strlen(tree) + 1;
2806         }
2807         strcpy(bcc_ptr, "?????");
2808         bcc_ptr += strlen("?????");
2809         bcc_ptr += 1;
2810         count = bcc_ptr - &pSMB->Password[0];
2811         pSMB->hdr.smb_buf_length += count;
2812         pSMB->ByteCount = cpu_to_le16(count);
2813
2814         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2815                          CIFS_STD_OP);
2816
2817         /* above now done in SendReceive */
2818         if ((rc == 0) && (tcon != NULL)) {
2819                 bool is_unicode;
2820
2821                 tcon->tidStatus = CifsGood;
2822                 tcon->need_reconnect = false;
2823                 tcon->tid = smb_buffer_response->Tid;
2824                 bcc_ptr = pByteArea(smb_buffer_response);
2825                 bytes_left = BCC(smb_buffer_response);
2826                 length = strnlen(bcc_ptr, bytes_left - 2);
2827                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2828                         is_unicode = true;
2829                 else
2830                         is_unicode = false;
2831
2832
2833                 /* skip service field (NB: this field is always ASCII) */
2834                 if (length == 3) {
2835                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2836                             (bcc_ptr[2] == 'C')) {
2837                                 cFYI(1, "IPC connection");
2838                                 tcon->ipc = 1;
2839                         }
2840                 } else if (length == 2) {
2841                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2842                                 /* the most common case */
2843                                 cFYI(1, "disk share connection");
2844                         }
2845                 }
2846                 bcc_ptr += length + 1;
2847                 bytes_left -= (length + 1);
2848                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2849
2850                 /* mostly informational -- no need to fail on error here */
2851                 kfree(tcon->nativeFileSystem);
2852                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2853                                                       bytes_left, is_unicode,
2854                                                       nls_codepage);
2855
2856                 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2857
2858                 if ((smb_buffer_response->WordCount == 3) ||
2859                          (smb_buffer_response->WordCount == 7))
2860                         /* field is in same location */
2861                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2862                 else
2863                         tcon->Flags = 0;
2864                 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2865         } else if ((rc == 0) && tcon == NULL) {
2866                 /* all we need to save for IPC$ connection */
2867                 ses->ipc_tid = smb_buffer_response->Tid;
2868         }
2869
2870         cifs_buf_release(smb_buffer);
2871         return rc;
2872 }
2873
2874 int
2875 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2876 {
2877         int rc = 0;
2878         char *tmp;
2879
2880         if (cifs_sb->tcon)
2881                 cifs_put_tcon(cifs_sb->tcon);
2882
2883         cifs_sb->tcon = NULL;
2884         tmp = cifs_sb->prepath;
2885         cifs_sb->prepathlen = 0;
2886         cifs_sb->prepath = NULL;
2887         kfree(tmp);
2888
2889         return rc;
2890 }
2891
2892 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
2893 {
2894         int rc = 0;
2895         struct TCP_Server_Info *server = ses->server;
2896
2897         /* only send once per connect */
2898         if (server->maxBuf != 0)
2899                 return 0;
2900
2901         rc = CIFSSMBNegotiate(xid, ses);
2902         if (rc == -EAGAIN) {
2903                 /* retry only once on 1st time connection */
2904                 rc = CIFSSMBNegotiate(xid, ses);
2905                 if (rc == -EAGAIN)
2906                         rc = -EHOSTDOWN;
2907         }
2908         if (rc == 0) {
2909                 spin_lock(&GlobalMid_Lock);
2910                 if (server->tcpStatus != CifsExiting)
2911                         server->tcpStatus = CifsGood;
2912                 else
2913                         rc = -EHOSTDOWN;
2914                 spin_unlock(&GlobalMid_Lock);
2915
2916         }
2917
2918         return rc;
2919 }
2920
2921
2922 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
2923                         struct nls_table *nls_info)
2924 {
2925         int rc = 0;
2926         struct TCP_Server_Info *server = ses->server;
2927
2928         ses->flags = 0;
2929         ses->capabilities = server->capabilities;
2930         if (linuxExtEnabled == 0)
2931                 ses->capabilities &= (~CAP_UNIX);
2932
2933         cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2934                  server->secMode, server->capabilities, server->timeAdj);
2935
2936         rc = CIFS_SessSetup(xid, ses, nls_info);
2937         if (rc) {
2938                 cERROR(1, "Send error in SessSetup = %d", rc);
2939         } else {
2940                 cFYI(1, "CIFS Session Established successfully");
2941                 spin_lock(&GlobalMid_Lock);
2942                 ses->status = CifsGood;
2943                 ses->need_reconnect = false;
2944                 spin_unlock(&GlobalMid_Lock);
2945         }
2946
2947         return rc;
2948 }
2949