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 "fscache.h"
  51
  52 #define CIFS_PORT 445
  53 #define RFC1001_PORT 139
  54
  55 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  56                          unsigned char *p24);
  57
  58 extern mempool_t *cifs_req_poolp;
  59
  60 struct smb_vol {
  61         char *username;
  62         char *password;
  63         char *domainname;
  64         char *UNC;
  65         char *UNCip;
  66         char *iocharset;  /* local code page for mapping to and from Unicode */
  67         char source_rfc1001_name[16]; /* netbios name of client */
  68         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  69         uid_t cred_uid;
  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         bool fsc:1;     /* enable fscache */
 102         bool mfsymlinks:1; /* use Minshall+French Symlinks */
 103         bool multiuser:1;
 104         unsigned int rsize;
 105         unsigned int wsize;
 106         bool sockopt_tcp_nodelay:1;
 107         unsigned short int port;
 108         unsigned long actimeo; /* attribute cache timeout (jiffies) */
 109         char *prepath;
 110         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 111         struct nls_table *local_nls;
 112 };
 113
 114 /* FIXME: should these be tunable? */
 115 #define TLINK_ERROR_EXPIRE      (1 * HZ)
 116 #define TLINK_IDLE_EXPIRE       (600 * HZ)
 117
 118 static int ip_connect(struct TCP_Server_Info *server);
 119 static int generic_ip_connect(struct TCP_Server_Info *server);
 120 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
 121 static void cifs_prune_tlinks(struct work_struct *work);
 122
 123 /*
 124  * cifs tcp session reconnection
 125  *
 126  * mark tcp session as reconnecting so temporarily locked
 127  * mark all smb sessions as reconnecting for tcp session
 128  * reconnect tcp session
 129  * wake up waiters on reconnection? - (not needed currently)
 130  */
 131 static int
 132 cifs_reconnect(struct TCP_Server_Info *server)
 133 {
 134         int rc = 0;
 135         struct list_head *tmp, *tmp2;
 136         struct cifsSesInfo *ses;
 137         struct cifsTconInfo *tcon;
 138         struct mid_q_entry *mid_entry;
 139
 140         spin_lock(&GlobalMid_Lock);
 141         if (server->tcpStatus == CifsExiting) {
 142                 /* the demux thread will exit normally
 143                 next time through the loop */
 144                 spin_unlock(&GlobalMid_Lock);
 145                 return rc;
 146         } else
 147                 server->tcpStatus = CifsNeedReconnect;
 148         spin_unlock(&GlobalMid_Lock);
 149         server->maxBuf = 0;
 150
 151         cFYI(1, "Reconnecting tcp session");
 152
 153         /* before reconnecting the tcp session, mark the smb session (uid)
 154                 and the tid bad so they are not used until reconnected */
 155         spin_lock(&cifs_tcp_ses_lock);
 156         list_for_each(tmp, &server->smb_ses_list) {
 157                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 158                 ses->need_reconnect = true;
 159                 ses->ipc_tid = 0;
 160                 list_for_each(tmp2, &ses->tcon_list) {
 161                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 162                         tcon->need_reconnect = true;
 163                 }
 164         }
 165         spin_unlock(&cifs_tcp_ses_lock);
 166         /* do not want to be sending data on a socket we are freeing */
 167         mutex_lock(&server->srv_mutex);
 168         if (server->ssocket) {
 169                 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
 170                         server->ssocket->flags);
 171                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 172                 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
 173                         server->ssocket->state,
 174                         server->ssocket->flags);
 175                 sock_release(server->ssocket);
 176                 server->ssocket = NULL;
 177         }
 178         server->sequence_number = 0;
 179         server->session_estab = false;
 180         kfree(server->session_key.response);
 181         server->session_key.response = NULL;
 182         server->session_key.len = 0;
 183
 184         spin_lock(&GlobalMid_Lock);
 185         list_for_each(tmp, &server->pending_mid_q) {
 186                 mid_entry = list_entry(tmp, struct
 187                                         mid_q_entry,
 188                                         qhead);
 189                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 190                                 /* Mark other intransit requests as needing
 191                                    retry so we do not immediately mark the
 192                                    session bad again (ie after we reconnect
 193                                    below) as they timeout too */
 194                         mid_entry->midState = MID_RETRY_NEEDED;
 195                 }
 196         }
 197         spin_unlock(&GlobalMid_Lock);
 198         mutex_unlock(&server->srv_mutex);
 199
 200         while ((server->tcpStatus != CifsExiting) &&
 201                (server->tcpStatus != CifsGood)) {
 202                 try_to_freeze();
 203
 204                 /* we should try only the port we connected to before */
 205                 rc = generic_ip_connect(server);
 206                 if (rc) {
 207                         cFYI(1, "reconnect error %d", rc);
 208                         msleep(3000);
 209                 } else {
 210                         atomic_inc(&tcpSesReconnectCount);
 211                         spin_lock(&GlobalMid_Lock);
 212                         if (server->tcpStatus != CifsExiting)
 213                                 server->tcpStatus = CifsGood;
 214                         spin_unlock(&GlobalMid_Lock);
 215         /*              atomic_set(&server->inFlight,0);*/
 216                         wake_up(&server->response_q);
 217                 }
 218         }
 219         return rc;
 220 }
 221
 222 /*
 223         return codes:
 224                 0       not a transact2, or all data present
 225                 >0      transact2 with that much data missing
 226                 -EINVAL = invalid transact2
 227
 228  */
 229 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 230 {
 231         struct smb_t2_rsp *pSMBt;
 232         int total_data_size;
 233         int data_in_this_rsp;
 234         int remaining;
 235
 236         if (pSMB->Command != SMB_COM_TRANSACTION2)
 237                 return 0;
 238
 239         /* check for plausible wct, bcc and t2 data and parm sizes */
 240         /* check for parm and data offset going beyond end of smb */
 241         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 242                 cFYI(1, "invalid transact2 word count");
 243                 return -EINVAL;
 244         }
 245
 246         pSMBt = (struct smb_t2_rsp *)pSMB;
 247
 248         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 249         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 250
 251         remaining = total_data_size - data_in_this_rsp;
 252
 253         if (remaining == 0)
 254                 return 0;
 255         else if (remaining < 0) {
 256                 cFYI(1, "total data %d smaller than data in frame %d",
 257                         total_data_size, data_in_this_rsp);
 258                 return -EINVAL;
 259         } else {
 260                 cFYI(1, "missing %d bytes from transact2, check next response",
 261                         remaining);
 262                 if (total_data_size > maxBufSize) {
 263                         cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 264                                 total_data_size, maxBufSize);
 265                         return -EINVAL;
 266                 }
 267                 return remaining;
 268         }
 269 }
 270
 271 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 272 {
 273         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 274         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 275         int total_data_size;
 276         int total_in_buf;
 277         int remaining;
 278         int total_in_buf2;
 279         char *data_area_of_target;
 280         char *data_area_of_buf2;
 281         __u16 byte_count;
 282
 283         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 284
 285         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 286                 cFYI(1, "total data size of primary and secondary t2 differ");
 287         }
 288
 289         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 290
 291         remaining = total_data_size - total_in_buf;
 292
 293         if (remaining < 0)
 294                 return -EINVAL;
 295
 296         if (remaining == 0) /* nothing to do, ignore */
 297                 return 0;
 298
 299         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 300         if (remaining < total_in_buf2) {
 301                 cFYI(1, "transact2 2nd response contains too much data");
 302         }
 303
 304         /* find end of first SMB data area */
 305         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 306                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 307         /* validate target area */
 308
 309         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 310                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 311
 312         data_area_of_target += total_in_buf;
 313
 314         /* copy second buffer into end of first buffer */
 315         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 316         total_in_buf += total_in_buf2;
 317         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 318         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 319         byte_count += total_in_buf2;
 320         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 321
 322         byte_count = pTargetSMB->smb_buf_length;
 323         byte_count += total_in_buf2;
 324
 325         /* BB also add check that we are not beyond maximum buffer size */
 326
 327         pTargetSMB->smb_buf_length = byte_count;
 328
 329         if (remaining == total_in_buf2) {
 330                 cFYI(1, "found the last secondary response");
 331                 return 0; /* we are done */
 332         } else /* more responses to go */
 333                 return 1;
 334
 335 }
 336
 337 static int
 338 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 339 {
 340         int length;
 341         unsigned int pdu_length, total_read;
 342         struct smb_hdr *smb_buffer = NULL;
 343         struct smb_hdr *bigbuf = NULL;
 344         struct smb_hdr *smallbuf = NULL;
 345         struct msghdr smb_msg;
 346         struct kvec iov;
 347         struct socket *csocket = server->ssocket;
 348         struct list_head *tmp;
 349         struct cifsSesInfo *ses;
 350         struct task_struct *task_to_wake = NULL;
 351         struct mid_q_entry *mid_entry;
 352         char temp;
 353         bool isLargeBuf = false;
 354         bool isMultiRsp;
 355         int reconnect;
 356
 357         current->flags |= PF_MEMALLOC;
 358         cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
 359
 360         length = atomic_inc_return(&tcpSesAllocCount);
 361         if (length > 1)
 362                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 363                                 GFP_KERNEL);
 364
 365         set_freezable();
 366         while (server->tcpStatus != CifsExiting) {
 367                 if (try_to_freeze())
 368                         continue;
 369                 if (bigbuf == NULL) {
 370                         bigbuf = cifs_buf_get();
 371                         if (!bigbuf) {
 372                                 cERROR(1, "No memory for large SMB response");
 373                                 msleep(3000);
 374                                 /* retry will check if exiting */
 375                                 continue;
 376                         }
 377                 } else if (isLargeBuf) {
 378                         /* we are reusing a dirty large buf, clear its start */
 379                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 380                 }
 381
 382                 if (smallbuf == NULL) {
 383                         smallbuf = cifs_small_buf_get();
 384                         if (!smallbuf) {
 385                                 cERROR(1, "No memory for SMB response");
 386                                 msleep(1000);
 387                                 /* retry will check if exiting */
 388                                 continue;
 389                         }
 390                         /* beginning of smb buffer is cleared in our buf_get */
 391                 } else /* if existing small buf clear beginning */
 392                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 393
 394                 isLargeBuf = false;
 395                 isMultiRsp = false;
 396                 smb_buffer = smallbuf;
 397                 iov.iov_base = smb_buffer;
 398                 iov.iov_len = 4;
 399                 smb_msg.msg_control = NULL;
 400                 smb_msg.msg_controllen = 0;
 401                 pdu_length = 4; /* enough to get RFC1001 header */
 402 incomplete_rcv:
 403                 length =
 404                     kernel_recvmsg(csocket, &smb_msg,
 405                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 406
 407                 if (server->tcpStatus == CifsExiting) {
 408                         break;
 409                 } else if (server->tcpStatus == CifsNeedReconnect) {
 410                         cFYI(1, "Reconnect after server stopped responding");
 411                         cifs_reconnect(server);
 412                         cFYI(1, "call to reconnect done");
 413                         csocket = server->ssocket;
 414                         continue;
 415                 } else if (length == -ERESTARTSYS ||
 416                            length == -EAGAIN ||
 417                            length == -EINTR) {
 418                         msleep(1); /* minimum sleep to prevent looping
 419                                 allowing socket to clear and app threads to set
 420                                 tcpStatus CifsNeedReconnect if server hung */
 421                         if (pdu_length < 4) {
 422                                 iov.iov_base = (4 - pdu_length) +
 423                                                         (char *)smb_buffer;
 424                                 iov.iov_len = pdu_length;
 425                                 smb_msg.msg_control = NULL;
 426                                 smb_msg.msg_controllen = 0;
 427                                 goto incomplete_rcv;
 428                         } else
 429                                 continue;
 430                 } else if (length <= 0) {
 431                         cFYI(1, "Reconnect after unexpected peek error %d",
 432                                 length);
 433                         cifs_reconnect(server);
 434                         csocket = server->ssocket;
 435                         wake_up(&server->response_q);
 436                         continue;
 437                 } else if (length < pdu_length) {
 438                         cFYI(1, "requested %d bytes but only got %d bytes",
 439                                   pdu_length, length);
 440                         pdu_length -= length;
 441                         msleep(1);
 442                         goto incomplete_rcv;
 443                 }
 444
 445                 /* The right amount was read from socket - 4 bytes */
 446                 /* so we can now interpret the length field */
 447
 448                 /* the first byte big endian of the length field,
 449                 is actually not part of the length but the type
 450                 with the most common, zero, as regular data */
 451                 temp = *((char *) smb_buffer);
 452
 453                 /* Note that FC 1001 length is big endian on the wire,
 454                 but we convert it here so it is always manipulated
 455                 as host byte order */
 456                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 457                 smb_buffer->smb_buf_length = pdu_length;
 458
 459                 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
 460
 461                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 462                         continue;
 463                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 464                         cFYI(1, "Good RFC 1002 session rsp");
 465                         continue;
 466                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 467                         /* we get this from Windows 98 instead of
 468                            an error on SMB negprot response */
 469                         cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
 470                                 pdu_length);
 471                         /* give server a second to clean up  */
 472                         msleep(1000);
 473                         /* always try 445 first on reconnect since we get NACK
 474                          * on some if we ever connected to port 139 (the NACK
 475                          * is since we do not begin with RFC1001 session
 476                          * initialize frame)
 477                          */
 478                         cifs_set_port((struct sockaddr *)
 479                                         &server->dstaddr, CIFS_PORT);
 480                         cifs_reconnect(server);
 481                         csocket = server->ssocket;
 482                         wake_up(&server->response_q);
 483                         continue;
 484                 } else if (temp != (char) 0) {
 485                         cERROR(1, "Unknown RFC 1002 frame");
 486                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 487                                       length);
 488                         cifs_reconnect(server);
 489                         csocket = server->ssocket;
 490                         continue;
 491                 }
 492
 493                 /* else we have an SMB response */
 494                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 495                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 496                         cERROR(1, "Invalid size SMB length %d pdu_length %d",
 497                                         length, pdu_length+4);
 498                         cifs_reconnect(server);
 499                         csocket = server->ssocket;
 500                         wake_up(&server->response_q);
 501                         continue;
 502                 }
 503
 504                 /* else length ok */
 505                 reconnect = 0;
 506
 507                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 508                         isLargeBuf = true;
 509                         memcpy(bigbuf, smallbuf, 4);
 510                         smb_buffer = bigbuf;
 511                 }
 512                 length = 0;
 513                 iov.iov_base = 4 + (char *)smb_buffer;
 514                 iov.iov_len = pdu_length;
 515                 for (total_read = 0; total_read < pdu_length;
 516                      total_read += length) {
 517                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 518                                                 pdu_length - total_read, 0);
 519                         if (server->tcpStatus == CifsExiting) {
 520                                 /* then will exit */
 521                                 reconnect = 2;
 522                                 break;
 523                         } else if (server->tcpStatus == CifsNeedReconnect) {
 524                                 cifs_reconnect(server);
 525                                 csocket = server->ssocket;
 526                                 /* Reconnect wakes up rspns q */
 527                                 /* Now we will reread sock */
 528                                 reconnect = 1;
 529                                 break;
 530                         } else if (length == -ERESTARTSYS ||
 531                                    length == -EAGAIN ||
 532                                    length == -EINTR) {
 533                                 msleep(1); /* minimum sleep to prevent looping,
 534                                               allowing socket to clear and app
 535                                               threads to set tcpStatus
 536                                               CifsNeedReconnect if server hung*/
 537                                 length = 0;
 538                                 continue;
 539                         } else if (length <= 0) {
 540                                 cERROR(1, "Received no data, expecting %d",
 541                                               pdu_length - total_read);
 542                                 cifs_reconnect(server);
 543                                 csocket = server->ssocket;
 544                                 reconnect = 1;
 545                                 break;
 546                         }
 547                 }
 548                 if (reconnect == 2)
 549                         break;
 550                 else if (reconnect == 1)
 551                         continue;
 552
 553                 length += 4; /* account for rfc1002 hdr */
 554
 555
 556                 dump_smb(smb_buffer, length);
 557                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 558                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 559                         continue;
 560                 }
 561
 562
 563                 task_to_wake = NULL;
 564                 spin_lock(&GlobalMid_Lock);
 565                 list_for_each(tmp, &server->pending_mid_q) {
 566                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 567
 568                         if ((mid_entry->mid == smb_buffer->Mid) &&
 569                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 570                             (mid_entry->command == smb_buffer->Command)) {
 571                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 572                                         /* We have a multipart transact2 resp */
 573                                         isMultiRsp = true;
 574                                         if (mid_entry->resp_buf) {
 575                                                 /* merge response - fix up 1st*/
 576                                                 if (coalesce_t2(smb_buffer,
 577                                                         mid_entry->resp_buf)) {
 578                                                         mid_entry->multiRsp =
 579                                                                  true;
 580                                                         break;
 581                                                 } else {
 582                                                         /* all parts received */
 583                                                         mid_entry->multiEnd =
 584                                                                  true;
 585                                                         goto multi_t2_fnd;
 586                                                 }
 587                                         } else {
 588                                                 if (!isLargeBuf) {
 589                                                         cERROR(1, "1st trans2 resp needs bigbuf");
 590                                         /* BB maybe we can fix this up,  switch
 591                                            to already allocated large buffer? */
 592                                                 } else {
 593                                                         /* Have first buffer */
 594                                                         mid_entry->resp_buf =
 595                                                                  smb_buffer;
 596                                                         mid_entry->largeBuf =
 597                                                                  true;
 598                                                         bigbuf = NULL;
 599                                                 }
 600                                         }
 601                                         break;
 602                                 }
 603                                 mid_entry->resp_buf = smb_buffer;
 604                                 mid_entry->largeBuf = isLargeBuf;
 605 multi_t2_fnd:
 606                                 task_to_wake = mid_entry->tsk;
 607                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 608 #ifdef CONFIG_CIFS_STATS2
 609                                 mid_entry->when_received = jiffies;
 610 #endif
 611                                 /* so we do not time out requests to  server
 612                                 which is still responding (since server could
 613                                 be busy but not dead) */
 614                                 server->lstrp = jiffies;
 615                                 break;
 616                         }
 617                 }
 618                 spin_unlock(&GlobalMid_Lock);
 619                 if (task_to_wake) {
 620                         /* Was previous buf put in mpx struct for multi-rsp? */
 621                         if (!isMultiRsp) {
 622                                 /* smb buffer will be freed by user thread */
 623                                 if (isLargeBuf)
 624                                         bigbuf = NULL;
 625                                 else
 626                                         smallbuf = NULL;
 627                         }
 628                         wake_up_process(task_to_wake);
 629                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 630                            !isMultiRsp) {
 631                         cERROR(1, "No task to wake, unknown frame received! "
 632                                    "NumMids %d", midCount.counter);
 633                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 634                                       sizeof(struct smb_hdr));
 635 #ifdef CONFIG_CIFS_DEBUG2
 636                         cifs_dump_detail(smb_buffer);
 637                         cifs_dump_mids(server);
 638 #endif /* CIFS_DEBUG2 */
 639
 640                 }
 641         } /* end while !EXITING */
 642
 643         /* take it off the list, if it's not already */
 644         spin_lock(&cifs_tcp_ses_lock);
 645         list_del_init(&server->tcp_ses_list);
 646         spin_unlock(&cifs_tcp_ses_lock);
 647
 648         spin_lock(&GlobalMid_Lock);
 649         server->tcpStatus = CifsExiting;
 650         spin_unlock(&GlobalMid_Lock);
 651         wake_up_all(&server->response_q);
 652
 653         /* check if we have blocked requests that need to free */
 654         /* Note that cifs_max_pending is normally 50, but
 655         can be set at module install time to as little as two */
 656         spin_lock(&GlobalMid_Lock);
 657         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 658                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 659         /* We do not want to set the max_pending too low or we
 660         could end up with the counter going negative */
 661         spin_unlock(&GlobalMid_Lock);
 662         /* Although there should not be any requests blocked on
 663         this queue it can not hurt to be paranoid and try to wake up requests
 664         that may haven been blocked when more than 50 at time were on the wire
 665         to the same server - they now will see the session is in exit state
 666         and get out of SendReceive.  */
 667         wake_up_all(&server->request_q);
 668         /* give those requests time to exit */
 669         msleep(125);
 670
 671         if (server->ssocket) {
 672                 sock_release(csocket);
 673                 server->ssocket = NULL;
 674         }
 675         /* buffer usuallly freed in free_mid - need to free it here on exit */
 676         cifs_buf_release(bigbuf);
 677         if (smallbuf) /* no sense logging a debug message if NULL */
 678                 cifs_small_buf_release(smallbuf);
 679
 680         /*
 681          * BB: we shouldn't have to do any of this. It shouldn't be
 682          * possible to exit from the thread with active SMB sessions
 683          */
 684         spin_lock(&cifs_tcp_ses_lock);
 685         if (list_empty(&server->pending_mid_q)) {
 686                 /* loop through server session structures attached to this and
 687                     mark them dead */
 688                 list_for_each(tmp, &server->smb_ses_list) {
 689                         ses = list_entry(tmp, struct cifsSesInfo,
 690                                          smb_ses_list);
 691                         ses->status = CifsExiting;
 692                         ses->server = NULL;
 693                 }
 694                 spin_unlock(&cifs_tcp_ses_lock);
 695         } else {
 696                 /* although we can not zero the server struct pointer yet,
 697                 since there are active requests which may depnd on them,
 698                 mark the corresponding SMB sessions as exiting too */
 699                 list_for_each(tmp, &server->smb_ses_list) {
 700                         ses = list_entry(tmp, struct cifsSesInfo,
 701                                          smb_ses_list);
 702                         ses->status = CifsExiting;
 703                 }
 704
 705                 spin_lock(&GlobalMid_Lock);
 706                 list_for_each(tmp, &server->pending_mid_q) {
 707                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 708                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 709                                 cFYI(1, "Clearing Mid 0x%x - waking up ",
 710                                          mid_entry->mid);
 711                                 task_to_wake = mid_entry->tsk;
 712                                 if (task_to_wake)
 713                                         wake_up_process(task_to_wake);
 714                         }
 715                 }
 716                 spin_unlock(&GlobalMid_Lock);
 717                 spin_unlock(&cifs_tcp_ses_lock);
 718                 /* 1/8th of sec is more than enough time for them to exit */
 719                 msleep(125);
 720         }
 721
 722         if (!list_empty(&server->pending_mid_q)) {
 723                 /* mpx threads have not exited yet give them
 724                 at least the smb send timeout time for long ops */
 725                 /* due to delays on oplock break requests, we need
 726                 to wait at least 45 seconds before giving up
 727                 on a request getting a response and going ahead
 728                 and killing cifsd */
 729                 cFYI(1, "Wait for exit from demultiplex thread");
 730                 msleep(46000);
 731                 /* if threads still have not exited they are probably never
 732                 coming home not much else we can do but free the memory */
 733         }
 734
 735         /* last chance to mark ses pointers invalid
 736         if there are any pointing to this (e.g
 737         if a crazy root user tried to kill cifsd
 738         kernel thread explicitly this might happen) */
 739         /* BB: This shouldn't be necessary, see above */
 740         spin_lock(&cifs_tcp_ses_lock);
 741         list_for_each(tmp, &server->smb_ses_list) {
 742                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 743                 ses->server = NULL;
 744         }
 745         spin_unlock(&cifs_tcp_ses_lock);
 746
 747         kfree(server->hostname);
 748         task_to_wake = xchg(&server->tsk, NULL);
 749         kfree(server);
 750
 751         length = atomic_dec_return(&tcpSesAllocCount);
 752         if (length  > 0)
 753                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 754                                 GFP_KERNEL);
 755
 756         /* if server->tsk was NULL then wait for a signal before exiting */
 757         if (!task_to_wake) {
 758                 set_current_state(TASK_INTERRUPTIBLE);
 759                 while (!signal_pending(current)) {
 760                         schedule();
 761                         set_current_state(TASK_INTERRUPTIBLE);
 762                 }
 763                 set_current_state(TASK_RUNNING);
 764         }
 765
 766         module_put_and_exit(0);
 767 }
 768
 769 /* extract the host portion of the UNC string */
 770 static char *
 771 extract_hostname(const char *unc)
 772 {
 773         const char *src;
 774         char *dst, *delim;
 775         unsigned int len;
 776
 777         /* skip double chars at beginning of string */
 778         /* BB: check validity of these bytes? */
 779         src = unc + 2;
 780
 781         /* delimiter between hostname and sharename is always '\\' now */
 782         delim = strchr(src, '\\');
 783         if (!delim)
 784                 return ERR_PTR(-EINVAL);
 785
 786         len = delim - src;
 787         dst = kmalloc((len + 1), GFP_KERNEL);
 788         if (dst == NULL)
 789                 return ERR_PTR(-ENOMEM);
 790
 791         memcpy(dst, src, len);
 792         dst[len] = '\0';
 793
 794         return dst;
 795 }
 796
 797 static int
 798 cifs_parse_mount_options(char *options, const char *devname,
 799                          struct smb_vol *vol)
 800 {
 801         char *value;
 802         char *data;
 803         unsigned int  temp_len, i, j;
 804         char separator[2];
 805         short int override_uid = -1;
 806         short int override_gid = -1;
 807         bool uid_specified = false;
 808         bool gid_specified = false;
 809         char *nodename = utsname()->nodename;
 810
 811         separator[0] = ',';
 812         separator[1] = 0;
 813
 814         /*
 815          * does not have to be perfect mapping since field is
 816          * informational, only used for servers that do not support
 817          * port 445 and it can be overridden at mount time
 818          */
 819         memset(vol->source_rfc1001_name, 0x20, 15);
 820         for (i = 0; i < strnlen(nodename, 15); i++)
 821                 vol->source_rfc1001_name[i] = toupper(nodename[i]);
 822
 823         vol->source_rfc1001_name[15] = 0;
 824         /* null target name indicates to use *SMBSERVR default called name
 825            if we end up sending RFC1001 session initialize */
 826         vol->target_rfc1001_name[0] = 0;
 827         vol->cred_uid = current_uid();
 828         vol->linux_uid = current_uid();
 829         vol->linux_gid = current_gid();
 830
 831         /* default to only allowing write access to owner of the mount */
 832         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 833
 834         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 835         /* default is always to request posix paths. */
 836         vol->posix_paths = 1;
 837         /* default to using server inode numbers where available */
 838         vol->server_ino = 1;
 839
 840         vol->actimeo = CIFS_DEF_ACTIMEO;
 841
 842         if (!options)
 843                 return 1;
 844
 845         if (strncmp(options, "sep=", 4) == 0) {
 846                 if (options[4] != 0) {
 847                         separator[0] = options[4];
 848                         options += 5;
 849                 } else {
 850                         cFYI(1, "Null separator not allowed");
 851                 }
 852         }
 853
 854         while ((data = strsep(&options, separator)) != NULL) {
 855                 if (!*data)
 856                         continue;
 857                 if ((value = strchr(data, '=')) != NULL)
 858                         *value++ = '\0';
 859
 860                 /* Have to parse this before we parse for "user" */
 861                 if (strnicmp(data, "user_xattr", 10) == 0) {
 862                         vol->no_xattr = 0;
 863                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 864                         vol->no_xattr = 1;
 865                 } else if (strnicmp(data, "user", 4) == 0) {
 866                         if (!value) {
 867                                 printk(KERN_WARNING
 868                                        "CIFS: invalid or missing username\n");
 869                                 return 1;       /* needs_arg; */
 870                         } else if (!*value) {
 871                                 /* null user, ie anonymous, authentication */
 872                                 vol->nullauth = 1;
 873                         }
 874                         if (strnlen(value, 200) < 200) {
 875                                 vol->username = value;
 876                         } else {
 877                                 printk(KERN_WARNING "CIFS: username too long\n");
 878                                 return 1;
 879                         }
 880                 } else if (strnicmp(data, "pass", 4) == 0) {
 881                         if (!value) {
 882                                 vol->password = NULL;
 883                                 continue;
 884                         } else if (value[0] == 0) {
 885                                 /* check if string begins with double comma
 886                                    since that would mean the password really
 887                                    does start with a comma, and would not
 888                                    indicate an empty string */
 889                                 if (value[1] != separator[0]) {
 890                                         vol->password = NULL;
 891                                         continue;
 892                                 }
 893                         }
 894                         temp_len = strlen(value);
 895                         /* removed password length check, NTLM passwords
 896                                 can be arbitrarily long */
 897
 898                         /* if comma in password, the string will be
 899                         prematurely null terminated.  Commas in password are
 900                         specified across the cifs mount interface by a double
 901                         comma ie ,, and a comma used as in other cases ie ','
 902                         as a parameter delimiter/separator is single and due
 903                         to the strsep above is temporarily zeroed. */
 904
 905                         /* NB: password legally can have multiple commas and
 906                         the only illegal character in a password is null */
 907
 908                         if ((value[temp_len] == 0) &&
 909                             (value[temp_len+1] == separator[0])) {
 910                                 /* reinsert comma */
 911                                 value[temp_len] = separator[0];
 912                                 temp_len += 2;  /* move after second comma */
 913                                 while (value[temp_len] != 0)  {
 914                                         if (value[temp_len] == separator[0]) {
 915                                                 if (value[temp_len+1] ==
 916                                                      separator[0]) {
 917                                                 /* skip second comma */
 918                                                         temp_len++;
 919                                                 } else {
 920                                                 /* single comma indicating start
 921                                                          of next parm */
 922                                                         break;
 923                                                 }
 924                                         }
 925                                         temp_len++;
 926                                 }
 927                                 if (value[temp_len] == 0) {
 928                                         options = NULL;
 929                                 } else {
 930                                         value[temp_len] = 0;
 931                                         /* point option to start of next parm */
 932                                         options = value + temp_len + 1;
 933                                 }
 934                                 /* go from value to value + temp_len condensing
 935                                 double commas to singles. Note that this ends up
 936                                 allocating a few bytes too many, which is ok */
 937                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 938                                 if (vol->password == NULL) {
 939                                         printk(KERN_WARNING "CIFS: no memory "
 940                                                             "for password\n");
 941                                         return 1;
 942                                 }
 943                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 944                                         vol->password[j] = value[i];
 945                                         if (value[i] == separator[0]
 946                                                 && value[i+1] == separator[0]) {
 947                                                 /* skip second comma */
 948                                                 i++;
 949                                         }
 950                                 }
 951                                 vol->password[j] = 0;
 952                         } else {
 953                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 954                                 if (vol->password == NULL) {
 955                                         printk(KERN_WARNING "CIFS: no memory "
 956                                                             "for password\n");
 957                                         return 1;
 958                                 }
 959                                 strcpy(vol->password, value);
 960                         }
 961                 } else if (!strnicmp(data, "ip", 2) ||
 962                            !strnicmp(data, "addr", 4)) {
 963                         if (!value || !*value) {
 964                                 vol->UNCip = NULL;
 965                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 966                                                         INET6_ADDRSTRLEN) {
 967                                 vol->UNCip = value;
 968                         } else {
 969                                 printk(KERN_WARNING "CIFS: ip address "
 970                                                     "too long\n");
 971                                 return 1;
 972                         }
 973                 } else if (strnicmp(data, "sec", 3) == 0) {
 974                         if (!value || !*value) {
 975                                 cERROR(1, "no security value specified");
 976                                 continue;
 977                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 978                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 979                                         CIFSSEC_MUST_SIGN;
 980                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 981                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 982                                         CIFSSEC_MAY_KRB5; */
 983                                 cERROR(1, "Krb5 cifs privacy not supported");
 984                                 return 1;
 985                         } else if (strnicmp(value, "krb5", 4) == 0) {
 986                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 987 #ifdef CONFIG_CIFS_EXPERIMENTAL
 988                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 989                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 990                                         CIFSSEC_MUST_SIGN;
 991                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 992                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 993 #endif
 994                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 995                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 996                                         CIFSSEC_MUST_SIGN;
 997                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 998                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 999                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
1000                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
1001                                         CIFSSEC_MUST_SIGN;
1002                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1003                                 /* ntlm is default so can be turned off too */
1004                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1005                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1006                                 /* BB is there a better way to do this? */
1007                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1008 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1009                         } else if (strnicmp(value, "lanman", 6) == 0) {
1010                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1011 #endif
1012                         } else if (strnicmp(value, "none", 4) == 0) {
1013                                 vol->nullauth = 1;
1014                         } else {
1015                                 cERROR(1, "bad security option: %s", value);
1016                                 return 1;
1017                         }
1018                 } else if ((strnicmp(data, "unc", 3) == 0)
1019                            || (strnicmp(data, "target", 6) == 0)
1020                            || (strnicmp(data, "path", 4) == 0)) {
1021                         if (!value || !*value) {
1022                                 printk(KERN_WARNING "CIFS: invalid path to "
1023                                                     "network resource\n");
1024                                 return 1;       /* needs_arg; */
1025                         }
1026                         if ((temp_len = strnlen(value, 300)) < 300) {
1027                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1028                                 if (vol->UNC == NULL)
1029                                         return 1;
1030                                 strcpy(vol->UNC, value);
1031                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1032                                         vol->UNC[0] = '\\';
1033                                         vol->UNC[1] = '\\';
1034                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1035                                         printk(KERN_WARNING
1036                                                "CIFS: UNC Path does not begin "
1037                                                "with // or \\\\ \n");
1038                                         return 1;
1039                                 }
1040                         } else {
1041                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1042                                 return 1;
1043                         }
1044                 } else if ((strnicmp(data, "domain", 3) == 0)
1045                            || (strnicmp(data, "workgroup", 5) == 0)) {
1046                         if (!value || !*value) {
1047                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1048                                 return 1;       /* needs_arg; */
1049                         }
1050                         /* BB are there cases in which a comma can be valid in
1051                         a domain name and need special handling? */
1052                         if (strnlen(value, 256) < 256) {
1053                                 vol->domainname = value;
1054                                 cFYI(1, "Domain name set");
1055                         } else {
1056                                 printk(KERN_WARNING "CIFS: domain name too "
1057                                                     "long\n");
1058                                 return 1;
1059                         }
1060                 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1061                         vol->srcaddr.ss_family = AF_UNSPEC;
1062
1063                         if (!value || !*value) {
1064                                 printk(KERN_WARNING "CIFS: srcaddr value"
1065                                        " not specified.\n");
1066                                 return 1;       /* needs_arg; */
1067                         }
1068                         i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1069                                                  value, strlen(value));
1070                         if (i == 0) {
1071                                 printk(KERN_WARNING "CIFS:  Could not parse"
1072                                        " srcaddr: %s\n",
1073                                        value);
1074                                 return 1;
1075                         }
1076                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1077                         if (!value || !*value) {
1078                                 printk(KERN_WARNING
1079                                         "CIFS: invalid path prefix\n");
1080                                 return 1;       /* needs_argument */
1081                         }
1082                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1083                                 if (value[0] != '/')
1084                                         temp_len++;  /* missing leading slash */
1085                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1086                                 if (vol->prepath == NULL)
1087                                         return 1;
1088                                 if (value[0] != '/') {
1089                                         vol->prepath[0] = '/';
1090                                         strcpy(vol->prepath+1, value);
1091                                 } else
1092                                         strcpy(vol->prepath, value);
1093                                 cFYI(1, "prefix path %s", vol->prepath);
1094                         } else {
1095                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1096                                 return 1;
1097                         }
1098                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1099                         if (!value || !*value) {
1100                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1101                                                     "specified\n");
1102                                 return 1;       /* needs_arg; */
1103                         }
1104                         if (strnlen(value, 65) < 65) {
1105                                 if (strnicmp(value, "default", 7))
1106                                         vol->iocharset = value;
1107                                 /* if iocharset not set then load_nls_default
1108                                    is used by caller */
1109                                 cFYI(1, "iocharset set to %s", value);
1110                         } else {
1111                                 printk(KERN_WARNING "CIFS: iocharset name "
1112                                                     "too long.\n");
1113                                 return 1;
1114                         }
1115                 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1116                         vol->linux_uid = simple_strtoul(value, &value, 0);
1117                         uid_specified = true;
1118                 } else if (!strnicmp(data, "forceuid", 8)) {
1119                         override_uid = 1;
1120                 } else if (!strnicmp(data, "noforceuid", 10)) {
1121                         override_uid = 0;
1122                 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1123                         vol->linux_gid = simple_strtoul(value, &value, 0);
1124                         gid_specified = true;
1125                 } else if (!strnicmp(data, "forcegid", 8)) {
1126                         override_gid = 1;
1127                 } else if (!strnicmp(data, "noforcegid", 10)) {
1128                         override_gid = 0;
1129                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1130                         if (value && *value) {
1131                                 vol->file_mode =
1132                                         simple_strtoul(value, &value, 0);
1133                         }
1134                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1135                         if (value && *value) {
1136                                 vol->dir_mode =
1137                                         simple_strtoul(value, &value, 0);
1138                         }
1139                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1140                         if (value && *value) {
1141                                 vol->dir_mode =
1142                                         simple_strtoul(value, &value, 0);
1143                         }
1144                 } else if (strnicmp(data, "port", 4) == 0) {
1145                         if (value && *value) {
1146                                 vol->port =
1147                                         simple_strtoul(value, &value, 0);
1148                         }
1149                 } else if (strnicmp(data, "rsize", 5) == 0) {
1150                         if (value && *value) {
1151                                 vol->rsize =
1152                                         simple_strtoul(value, &value, 0);
1153                         }
1154                 } else if (strnicmp(data, "wsize", 5) == 0) {
1155                         if (value && *value) {
1156                                 vol->wsize =
1157                                         simple_strtoul(value, &value, 0);
1158                         }
1159                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1160                         if (!value || !*value) {
1161                                 cERROR(1, "no socket option specified");
1162                                 continue;
1163                         } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1164                                 vol->sockopt_tcp_nodelay = 1;
1165                         }
1166                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1167                         if (!value || !*value || (*value == ' ')) {
1168                                 cFYI(1, "invalid (empty) netbiosname");
1169                         } else {
1170                                 memset(vol->source_rfc1001_name, 0x20, 15);
1171                                 for (i = 0; i < 15; i++) {
1172                                 /* BB are there cases in which a comma can be
1173                                 valid in this workstation netbios name (and need
1174                                 special handling)? */
1175
1176                                 /* We do not uppercase netbiosname for user */
1177                                         if (value[i] == 0)
1178                                                 break;
1179                                         else
1180                                                 vol->source_rfc1001_name[i] =
1181                                                                 value[i];
1182                                 }
1183                                 /* The string has 16th byte zero still from
1184                                 set at top of the function  */
1185                                 if ((i == 15) && (value[i] != 0))
1186                                         printk(KERN_WARNING "CIFS: netbiosname"
1187                                                 " longer than 15 truncated.\n");
1188                         }
1189                 } else if (strnicmp(data, "servern", 7) == 0) {
1190                         /* servernetbiosname specified override *SMBSERVER */
1191                         if (!value || !*value || (*value == ' ')) {
1192                                 cFYI(1, "empty server netbiosname specified");
1193                         } else {
1194                                 /* last byte, type, is 0x20 for servr type */
1195                                 memset(vol->target_rfc1001_name, 0x20, 16);
1196
1197                                 for (i = 0; i < 15; i++) {
1198                                 /* BB are there cases in which a comma can be
1199                                    valid in this workstation netbios name
1200                                    (and need special handling)? */
1201
1202                                 /* user or mount helper must uppercase
1203                                    the netbiosname */
1204                                         if (value[i] == 0)
1205                                                 break;
1206                                         else
1207                                                 vol->target_rfc1001_name[i] =
1208                                                                 value[i];
1209                                 }
1210                                 /* The string has 16th byte zero still from
1211                                    set at top of the function  */
1212                                 if ((i == 15) && (value[i] != 0))
1213                                         printk(KERN_WARNING "CIFS: server net"
1214                                         "biosname longer than 15 truncated.\n");
1215                         }
1216                 } else if (strnicmp(data, "actimeo", 7) == 0) {
1217                         if (value && *value) {
1218                                 vol->actimeo = HZ * simple_strtoul(value,
1219                                                                    &value, 0);
1220                                 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1221                                         cERROR(1, "CIFS: attribute cache"
1222                                                         "timeout too large");
1223                                         return 1;
1224                                 }
1225                         }
1226                 } else if (strnicmp(data, "credentials", 4) == 0) {
1227                         /* ignore */
1228                 } else if (strnicmp(data, "version", 3) == 0) {
1229                         /* ignore */
1230                 } else if (strnicmp(data, "guest", 5) == 0) {
1231                         /* ignore */
1232                 } else if (strnicmp(data, "rw", 2) == 0) {
1233                         /* ignore */
1234                 } else if (strnicmp(data, "ro", 2) == 0) {
1235                         /* ignore */
1236                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1237                         vol->noblocksnd = 1;
1238                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1239                         vol->noautotune = 1;
1240                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1241                                    (strnicmp(data, "nosuid", 6) == 0) ||
1242                                    (strnicmp(data, "exec", 4) == 0) ||
1243                                    (strnicmp(data, "noexec", 6) == 0) ||
1244                                    (strnicmp(data, "nodev", 5) == 0) ||
1245                                    (strnicmp(data, "noauto", 6) == 0) ||
1246                                    (strnicmp(data, "dev", 3) == 0)) {
1247                         /*  The mount tool or mount.cifs helper (if present)
1248                             uses these opts to set flags, and the flags are read
1249                             by the kernel vfs layer before we get here (ie
1250                             before read super) so there is no point trying to
1251                             parse these options again and set anything and it
1252                             is ok to just ignore them */
1253                         continue;
1254                 } else if (strnicmp(data, "hard", 4) == 0) {
1255                         vol->retry = 1;
1256                 } else if (strnicmp(data, "soft", 4) == 0) {
1257                         vol->retry = 0;
1258                 } else if (strnicmp(data, "perm", 4) == 0) {
1259                         vol->noperm = 0;
1260                 } else if (strnicmp(data, "noperm", 6) == 0) {
1261                         vol->noperm = 1;
1262                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1263                         vol->remap = 1;
1264                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1265                         vol->remap = 0;
1266                 } else if (strnicmp(data, "sfu", 3) == 0) {
1267                         vol->sfu_emul = 1;
1268                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1269                         vol->sfu_emul = 0;
1270                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1271                         vol->nodfs = 1;
1272                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1273                         vol->posix_paths = 1;
1274                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1275                         vol->posix_paths = 0;
1276                 } else if (strnicmp(data, "nounix", 6) == 0) {
1277                         vol->no_linux_ext = 1;
1278                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1279                         vol->no_linux_ext = 1;
1280                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1281                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1282                         vol->nocase = 1;
1283                 } else if (strnicmp(data, "mand", 4) == 0) {
1284                         /* ignore */
1285                 } else if (strnicmp(data, "nomand", 6) == 0) {
1286                         /* ignore */
1287                 } else if (strnicmp(data, "_netdev", 7) == 0) {
1288                         /* ignore */
1289                 } else if (strnicmp(data, "brl", 3) == 0) {
1290                         vol->nobrl =  0;
1291                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1292                            (strnicmp(data, "nolock", 6) == 0)) {
1293                         vol->nobrl =  1;
1294                         /* turn off mandatory locking in mode
1295                         if remote locking is turned off since the
1296                         local vfs will do advisory */
1297                         if (vol->file_mode ==
1298                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1299                                 vol->file_mode = S_IALLUGO;
1300                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1301                         /* will take the shorter form "forcemand" as well */
1302                         /* This mount option will force use of mandatory
1303                           (DOS/Windows style) byte range locks, instead of
1304                           using posix advisory byte range locks, even if the
1305                           Unix extensions are available and posix locks would
1306                           be supported otherwise. If Unix extensions are not
1307                           negotiated this has no effect since mandatory locks
1308                           would be used (mandatory locks is all that those
1309                           those servers support) */
1310                         vol->mand_lock = 1;
1311                 } else if (strnicmp(data, "setuids", 7) == 0) {
1312                         vol->setuids = 1;
1313                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1314                         vol->setuids = 0;
1315                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1316                         vol->dynperm = true;
1317                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1318                         vol->dynperm = false;
1319                 } else if (strnicmp(data, "nohard", 6) == 0) {
1320                         vol->retry = 0;
1321                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1322                         vol->retry = 1;
1323                 } else if (strnicmp(data, "nointr", 6) == 0) {
1324                         vol->intr = 0;
1325                 } else if (strnicmp(data, "intr", 4) == 0) {
1326                         vol->intr = 1;
1327                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1328                         vol->nostrictsync = 1;
1329                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1330                         vol->nostrictsync = 0;
1331                 } else if (strnicmp(data, "serverino", 7) == 0) {
1332                         vol->server_ino = 1;
1333                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1334                         vol->server_ino = 0;
1335                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1336                         vol->cifs_acl = 1;
1337                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1338                         vol->cifs_acl = 0;
1339                 } else if (strnicmp(data, "acl", 3) == 0) {
1340                         vol->no_psx_acl = 0;
1341                 } else if (strnicmp(data, "noacl", 5) == 0) {
1342                         vol->no_psx_acl = 1;
1343 #ifdef CONFIG_CIFS_EXPERIMENTAL
1344                 } else if (strnicmp(data, "locallease", 6) == 0) {
1345                         vol->local_lease = 1;
1346 #endif
1347                 } else if (strnicmp(data, "sign", 4) == 0) {
1348                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1349                 } else if (strnicmp(data, "seal", 4) == 0) {
1350                         /* we do not do the following in secFlags because seal
1351                            is a per tree connection (mount) not a per socket
1352                            or per-smb connection option in the protocol */
1353                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1354                         vol->seal = 1;
1355                 } else if (strnicmp(data, "direct", 6) == 0) {
1356                         vol->direct_io = 1;
1357                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1358                         vol->direct_io = 1;
1359                 } else if (strnicmp(data, "noac", 4) == 0) {
1360                         printk(KERN_WARNING "CIFS: Mount option noac not "
1361                                 "supported. Instead set "
1362                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1363                 } else if (strnicmp(data, "fsc", 3) == 0) {
1364 #ifndef CONFIG_CIFS_FSCACHE
1365                         cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
1366                                   "kernel config option set");
1367                         return 1;
1368 #endif
1369                         vol->fsc = true;
1370                 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1371                         vol->mfsymlinks = true;
1372                 } else if (strnicmp(data, "multiuser", 8) == 0) {
1373                         vol->multiuser = true;
1374                 } else
1375                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1376                                                 data);
1377         }
1378         if (vol->UNC == NULL) {
1379                 if (devname == NULL) {
1380                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1381                                                 "target\n");
1382                         return 1;
1383                 }
1384                 if ((temp_len = strnlen(devname, 300)) < 300) {
1385                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1386                         if (vol->UNC == NULL)
1387                                 return 1;
1388                         strcpy(vol->UNC, devname);
1389                         if (strncmp(vol->UNC, "//", 2) == 0) {
1390                                 vol->UNC[0] = '\\';
1391                                 vol->UNC[1] = '\\';
1392                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1393                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1394                                                     "begin with // or \\\\ \n");
1395                                 return 1;
1396                         }
1397                         value = strpbrk(vol->UNC+2, "/\\");
1398                         if (value)
1399                                 *value = '\\';
1400                 } else {
1401                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1402                         return 1;
1403                 }
1404         }
1405
1406         if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1407                 cERROR(1, "Multiuser mounts currently require krb5 "
1408                           "authentication!");
1409                 return 1;
1410         }
1411
1412         if (vol->UNCip == NULL)
1413                 vol->UNCip = &vol->UNC[2];
1414
1415         if (uid_specified)
1416                 vol->override_uid = override_uid;
1417         else if (override_uid == 1)
1418                 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1419                                    "specified with no uid= option.\n");
1420
1421         if (gid_specified)
1422                 vol->override_gid = override_gid;
1423         else if (override_gid == 1)
1424                 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1425                                    "specified with no gid= option.\n");
1426
1427         return 0;
1428 }
1429
1430 /** Returns true if srcaddr isn't specified and rhs isn't
1431  * specified, or if srcaddr is specified and
1432  * matches the IP address of the rhs argument.
1433  */
1434 static bool
1435 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1436 {
1437         switch (srcaddr->sa_family) {
1438         case AF_UNSPEC:
1439                 return (rhs->sa_family == AF_UNSPEC);
1440         case AF_INET: {
1441                 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1442                 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1443                 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1444         }
1445         case AF_INET6: {
1446                 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1447                 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1448                 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1449         }
1450         default:
1451                 WARN_ON(1);
1452                 return false; /* don't expect to be here */
1453         }
1454 }
1455
1456 /*
1457  * If no port is specified in addr structure, we try to match with 445 port
1458  * and if it fails - with 139 ports. It should be called only if address
1459  * families of server and addr are equal.
1460  */
1461 static bool
1462 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1463 {
1464         unsigned short int port, *sport;
1465
1466         switch (addr->sa_family) {
1467         case AF_INET:
1468                 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1469                 port = ((struct sockaddr_in *) addr)->sin_port;
1470                 break;
1471         case AF_INET6:
1472                 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1473                 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1474                 break;
1475         default:
1476                 WARN_ON(1);
1477                 return false;
1478         }
1479
1480         if (!port) {
1481                 port = htons(CIFS_PORT);
1482                 if (port == *sport)
1483                         return true;
1484
1485                 port = htons(RFC1001_PORT);
1486         }
1487
1488         return port == *sport;
1489 }
1490
1491 static bool
1492 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1493               struct sockaddr *srcaddr)
1494 {
1495         switch (addr->sa_family) {
1496         case AF_INET: {
1497                 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1498                 struct sockaddr_in *srv_addr4 =
1499                                         (struct sockaddr_in *)&server->dstaddr;
1500
1501                 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1502                         return false;
1503                 break;
1504         }
1505         case AF_INET6: {
1506                 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1507                 struct sockaddr_in6 *srv_addr6 =
1508                                         (struct sockaddr_in6 *)&server->dstaddr;
1509
1510                 if (!ipv6_addr_equal(&addr6->sin6_addr,
1511                                      &srv_addr6->sin6_addr))
1512                         return false;
1513                 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1514                         return false;
1515                 break;
1516         }
1517         default:
1518                 WARN_ON(1);
1519                 return false; /* don't expect to be here */
1520         }
1521
1522         if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1523                 return false;
1524
1525         return true;
1526 }
1527
1528 static bool
1529 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1530 {
1531         unsigned int secFlags;
1532
1533         if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1534                 secFlags = vol->secFlg;
1535         else
1536                 secFlags = global_secflags | vol->secFlg;
1537
1538         switch (server->secType) {
1539         case LANMAN:
1540                 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1541                         return false;
1542                 break;
1543         case NTLMv2:
1544                 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1545                         return false;
1546                 break;
1547         case NTLM:
1548                 if (!(secFlags & CIFSSEC_MAY_NTLM))
1549                         return false;
1550                 break;
1551         case Kerberos:
1552                 if (!(secFlags & CIFSSEC_MAY_KRB5))
1553                         return false;
1554                 break;
1555         case RawNTLMSSP:
1556                 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1557                         return false;
1558                 break;
1559         default:
1560                 /* shouldn't happen */
1561                 return false;
1562         }
1563
1564         /* now check if signing mode is acceptible */
1565         if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1566             (server->secMode & SECMODE_SIGN_REQUIRED))
1567                         return false;
1568         else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1569                  (server->secMode &
1570                   (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1571                         return false;
1572
1573         return true;
1574 }
1575
1576 static struct TCP_Server_Info *
1577 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1578 {
1579         struct TCP_Server_Info *server;
1580
1581         spin_lock(&cifs_tcp_ses_lock);
1582         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1583                 if (!match_address(server, addr,
1584                                    (struct sockaddr *)&vol->srcaddr))
1585                         continue;
1586
1587                 if (!match_port(server, addr))
1588                         continue;
1589
1590                 if (!match_security(server, vol))
1591                         continue;
1592
1593                 ++server->srv_count;
1594                 spin_unlock(&cifs_tcp_ses_lock);
1595                 cFYI(1, "Existing tcp session with server found");
1596                 return server;
1597         }
1598         spin_unlock(&cifs_tcp_ses_lock);
1599         return NULL;
1600 }
1601
1602 static void
1603 cifs_put_tcp_session(struct TCP_Server_Info *server)
1604 {
1605         struct task_struct *task;
1606
1607         spin_lock(&cifs_tcp_ses_lock);
1608         if (--server->srv_count > 0) {
1609                 spin_unlock(&cifs_tcp_ses_lock);
1610                 return;
1611         }
1612
1613         list_del_init(&server->tcp_ses_list);
1614         spin_unlock(&cifs_tcp_ses_lock);
1615
1616         spin_lock(&GlobalMid_Lock);
1617         server->tcpStatus = CifsExiting;
1618         spin_unlock(&GlobalMid_Lock);
1619
1620         cifs_crypto_shash_release(server);
1621         cifs_fscache_release_client_cookie(server);
1622
1623         kfree(server->session_key.response);
1624         server->session_key.response = NULL;
1625         server->session_key.len = 0;
1626
1627         task = xchg(&server->tsk, NULL);
1628         if (task)
1629                 force_sig(SIGKILL, task);
1630 }
1631
1632 static struct TCP_Server_Info *
1633 cifs_get_tcp_session(struct smb_vol *volume_info)
1634 {
1635         struct TCP_Server_Info *tcp_ses = NULL;
1636         struct sockaddr_storage addr;
1637         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1638         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1639         int rc;
1640
1641         memset(&addr, 0, sizeof(struct sockaddr_storage));
1642
1643         cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1644
1645         if (volume_info->UNCip && volume_info->UNC) {
1646                 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1647                                         volume_info->UNCip,
1648                                         strlen(volume_info->UNCip),
1649                                         volume_info->port);
1650                 if (!rc) {
1651                         /* we failed translating address */
1652                         rc = -EINVAL;
1653                         goto out_err;
1654                 }
1655         } else if (volume_info->UNCip) {
1656                 /* BB using ip addr as tcp_ses name to connect to the
1657                    DFS root below */
1658                 cERROR(1, "Connecting to DFS root not implemented yet");
1659                 rc = -EINVAL;
1660                 goto out_err;
1661         } else /* which tcp_sess DFS root would we conect to */ {
1662                 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1663                         "unc=//192.168.1.100/public) specified");
1664                 rc = -EINVAL;
1665                 goto out_err;
1666         }
1667
1668         /* see if we already have a matching tcp_ses */
1669         tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1670         if (tcp_ses)
1671                 return tcp_ses;
1672
1673         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1674         if (!tcp_ses) {
1675                 rc = -ENOMEM;
1676                 goto out_err;
1677         }
1678
1679         rc = cifs_crypto_shash_allocate(tcp_ses);
1680         if (rc) {
1681                 cERROR(1, "could not setup hash structures rc %d", rc);
1682                 goto out_err;
1683         }
1684
1685         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1686         if (IS_ERR(tcp_ses->hostname)) {
1687                 rc = PTR_ERR(tcp_ses->hostname);
1688                 goto out_err_crypto_release;
1689         }
1690
1691         tcp_ses->noblocksnd = volume_info->noblocksnd;
1692         tcp_ses->noautotune = volume_info->noautotune;
1693         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1694         atomic_set(&tcp_ses->inFlight, 0);
1695         init_waitqueue_head(&tcp_ses->response_q);
1696         init_waitqueue_head(&tcp_ses->request_q);
1697         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1698         mutex_init(&tcp_ses->srv_mutex);
1699         memcpy(tcp_ses->workstation_RFC1001_name,
1700                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1701         memcpy(tcp_ses->server_RFC1001_name,
1702                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1703         tcp_ses->session_estab = false;
1704         tcp_ses->sequence_number = 0;
1705         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1706         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1707
1708         /*
1709          * at this point we are the only ones with the pointer
1710          * to the struct since the kernel thread not created yet
1711          * no need to spinlock this init of tcpStatus or srv_count
1712          */
1713         tcp_ses->tcpStatus = CifsNew;
1714         memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1715                sizeof(tcp_ses->srcaddr));
1716         ++tcp_ses->srv_count;
1717
1718         if (addr.ss_family == AF_INET6) {
1719                 cFYI(1, "attempting ipv6 connect");
1720                 /* BB should we allow ipv6 on port 139? */
1721                 /* other OS never observed in Wild doing 139 with v6 */
1722                 memcpy(&tcp_ses->dstaddr, sin_server6,
1723                        sizeof(struct sockaddr_in6));
1724         } else
1725                 memcpy(&tcp_ses->dstaddr, sin_server,
1726                        sizeof(struct sockaddr_in));
1727
1728         rc = ip_connect(tcp_ses);
1729         if (rc < 0) {
1730                 cERROR(1, "Error connecting to socket. Aborting operation");
1731                 goto out_err_crypto_release;
1732         }
1733
1734         /*
1735          * since we're in a cifs function already, we know that
1736          * this will succeed. No need for try_module_get().
1737          */
1738         __module_get(THIS_MODULE);
1739         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1740                                   tcp_ses, "cifsd");
1741         if (IS_ERR(tcp_ses->tsk)) {
1742                 rc = PTR_ERR(tcp_ses->tsk);
1743                 cERROR(1, "error %d create cifsd thread", rc);
1744                 module_put(THIS_MODULE);
1745                 goto out_err_crypto_release;
1746         }
1747
1748         /* thread spawned, put it on the list */
1749         spin_lock(&cifs_tcp_ses_lock);
1750         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1751         spin_unlock(&cifs_tcp_ses_lock);
1752
1753         cifs_fscache_get_client_cookie(tcp_ses);
1754
1755         return tcp_ses;
1756
1757 out_err_crypto_release:
1758         cifs_crypto_shash_release(tcp_ses);
1759
1760 out_err:
1761         if (tcp_ses) {
1762                 if (!IS_ERR(tcp_ses->hostname))
1763                         kfree(tcp_ses->hostname);
1764                 if (tcp_ses->ssocket)
1765                         sock_release(tcp_ses->ssocket);
1766                 kfree(tcp_ses);
1767         }
1768         return ERR_PTR(rc);
1769 }
1770
1771 static struct cifsSesInfo *
1772 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1773 {
1774         struct cifsSesInfo *ses;
1775
1776         spin_lock(&cifs_tcp_ses_lock);
1777         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1778                 switch (server->secType) {
1779                 case Kerberos:
1780                         if (vol->cred_uid != ses->cred_uid)
1781                                 continue;
1782                         break;
1783                 default:
1784                         /* anything else takes username/password */
1785                         if (strncmp(ses->userName, vol->username,
1786                                     MAX_USERNAME_SIZE))
1787                                 continue;
1788                         if (strlen(vol->username) != 0 &&
1789                             ses->password != NULL &&
1790                             strncmp(ses->password,
1791                                     vol->password ? vol->password : "",
1792                                     MAX_PASSWORD_SIZE))
1793                                 continue;
1794                 }
1795                 ++ses->ses_count;
1796                 spin_unlock(&cifs_tcp_ses_lock);
1797                 return ses;
1798         }
1799         spin_unlock(&cifs_tcp_ses_lock);
1800         return NULL;
1801 }
1802
1803 static void
1804 cifs_put_smb_ses(struct cifsSesInfo *ses)
1805 {
1806         int xid;
1807         struct TCP_Server_Info *server = ses->server;
1808
1809         cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1810         spin_lock(&cifs_tcp_ses_lock);
1811         if (--ses->ses_count > 0) {
1812                 spin_unlock(&cifs_tcp_ses_lock);
1813                 return;
1814         }
1815
1816         list_del_init(&ses->smb_ses_list);
1817         spin_unlock(&cifs_tcp_ses_lock);
1818
1819         if (ses->status == CifsGood) {
1820                 xid = GetXid();
1821                 CIFSSMBLogoff(xid, ses);
1822                 _FreeXid(xid);
1823         }
1824         sesInfoFree(ses);
1825         cifs_put_tcp_session(server);
1826 }
1827
1828 static struct cifsSesInfo *
1829 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1830 {
1831         int rc = -ENOMEM, xid;
1832         struct cifsSesInfo *ses;
1833         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1834         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1835
1836         xid = GetXid();
1837
1838         ses = cifs_find_smb_ses(server, volume_info);
1839         if (ses) {
1840                 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1841
1842                 mutex_lock(&ses->session_mutex);
1843                 rc = cifs_negotiate_protocol(xid, ses);
1844                 if (rc) {
1845                         mutex_unlock(&ses->session_mutex);
1846                         /* problem -- put our ses reference */
1847                         cifs_put_smb_ses(ses);
1848                         FreeXid(xid);
1849                         return ERR_PTR(rc);
1850                 }
1851                 if (ses->need_reconnect) {
1852                         cFYI(1, "Session needs reconnect");
1853                         rc = cifs_setup_session(xid, ses,
1854                                                 volume_info->local_nls);
1855                         if (rc) {
1856                                 mutex_unlock(&ses->session_mutex);
1857                                 /* problem -- put our reference */
1858                                 cifs_put_smb_ses(ses);
1859                                 FreeXid(xid);
1860                                 return ERR_PTR(rc);
1861                         }
1862                 }
1863                 mutex_unlock(&ses->session_mutex);
1864
1865                 /* existing SMB ses has a server reference already */
1866                 cifs_put_tcp_session(server);
1867                 FreeXid(xid);
1868                 return ses;
1869         }
1870
1871         cFYI(1, "Existing smb sess not found");
1872         ses = sesInfoAlloc();
1873         if (ses == NULL)
1874                 goto get_ses_fail;
1875
1876         /* new SMB session uses our server ref */
1877         ses->server = server;
1878         if (server->dstaddr.ss_family == AF_INET6)
1879                 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1880         else
1881                 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1882
1883         if (volume_info->username)
1884                 strncpy(ses->userName, volume_info->username,
1885                         MAX_USERNAME_SIZE);
1886
1887         /* volume_info->password freed at unmount */
1888         if (volume_info->password) {
1889                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1890                 if (!ses->password)
1891                         goto get_ses_fail;
1892         }
1893         if (volume_info->domainname) {
1894                 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1895                 if (!ses->domainName)
1896                         goto get_ses_fail;
1897         }
1898         ses->cred_uid = volume_info->cred_uid;
1899         ses->linux_uid = volume_info->linux_uid;
1900         ses->overrideSecFlg = volume_info->secFlg;
1901
1902         mutex_lock(&ses->session_mutex);
1903         rc = cifs_negotiate_protocol(xid, ses);
1904         if (!rc)
1905                 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1906         mutex_unlock(&ses->session_mutex);
1907         if (rc)
1908                 goto get_ses_fail;
1909
1910         /* success, put it on the list */
1911         spin_lock(&cifs_tcp_ses_lock);
1912         list_add(&ses->smb_ses_list, &server->smb_ses_list);
1913         spin_unlock(&cifs_tcp_ses_lock);
1914
1915         FreeXid(xid);
1916         return ses;
1917
1918 get_ses_fail:
1919         sesInfoFree(ses);
1920         FreeXid(xid);
1921         return ERR_PTR(rc);
1922 }
1923
1924 static struct cifsTconInfo *
1925 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1926 {
1927         struct list_head *tmp;
1928         struct cifsTconInfo *tcon;
1929
1930         spin_lock(&cifs_tcp_ses_lock);
1931         list_for_each(tmp, &ses->tcon_list) {
1932                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1933                 if (tcon->tidStatus == CifsExiting)
1934                         continue;
1935                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1936                         continue;
1937
1938                 ++tcon->tc_count;
1939                 spin_unlock(&cifs_tcp_ses_lock);
1940                 return tcon;
1941         }
1942         spin_unlock(&cifs_tcp_ses_lock);
1943         return NULL;
1944 }
1945
1946 static void
1947 cifs_put_tcon(struct cifsTconInfo *tcon)
1948 {
1949         int xid;
1950         struct cifsSesInfo *ses = tcon->ses;
1951
1952         cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1953         spin_lock(&cifs_tcp_ses_lock);
1954         if (--tcon->tc_count > 0) {
1955                 spin_unlock(&cifs_tcp_ses_lock);
1956                 return;
1957         }
1958
1959         list_del_init(&tcon->tcon_list);
1960         spin_unlock(&cifs_tcp_ses_lock);
1961
1962         xid = GetXid();
1963         CIFSSMBTDis(xid, tcon);
1964         _FreeXid(xid);
1965
1966         cifs_fscache_release_super_cookie(tcon);
1967         tconInfoFree(tcon);
1968         cifs_put_smb_ses(ses);
1969 }
1970
1971 static struct cifsTconInfo *
1972 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1973 {
1974         int rc, xid;
1975         struct cifsTconInfo *tcon;
1976
1977         tcon = cifs_find_tcon(ses, volume_info->UNC);
1978         if (tcon) {
1979                 cFYI(1, "Found match on UNC path");
1980                 /* existing tcon already has a reference */
1981                 cifs_put_smb_ses(ses);
1982                 if (tcon->seal != volume_info->seal)
1983                         cERROR(1, "transport encryption setting "
1984                                    "conflicts with existing tid");
1985                 return tcon;
1986         }
1987
1988         tcon = tconInfoAlloc();
1989         if (tcon == NULL) {
1990                 rc = -ENOMEM;
1991                 goto out_fail;
1992         }
1993
1994         tcon->ses = ses;
1995         if (volume_info->password) {
1996                 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1997                 if (!tcon->password) {
1998                         rc = -ENOMEM;
1999                         goto out_fail;
2000                 }
2001         }
2002
2003         if (strchr(volume_info->UNC + 3, '\\') == NULL
2004             && strchr(volume_info->UNC + 3, '/') == NULL) {
2005                 cERROR(1, "Missing share name");
2006                 rc = -ENODEV;
2007                 goto out_fail;
2008         }
2009
2010         /* BB Do we need to wrap session_mutex around
2011          * this TCon call and Unix SetFS as
2012          * we do on SessSetup and reconnect? */
2013         xid = GetXid();
2014         rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2015         FreeXid(xid);
2016         cFYI(1, "CIFS Tcon rc = %d", rc);
2017         if (rc)
2018                 goto out_fail;
2019
2020         if (volume_info->nodfs) {
2021                 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2022                 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2023         }
2024         tcon->seal = volume_info->seal;
2025         /* we can have only one retry value for a connection
2026            to a share so for resources mounted more than once
2027            to the same server share the last value passed in
2028            for the retry flag is used */
2029         tcon->retry = volume_info->retry;
2030         tcon->nocase = volume_info->nocase;
2031         tcon->local_lease = volume_info->local_lease;
2032
2033         spin_lock(&cifs_tcp_ses_lock);
2034         list_add(&tcon->tcon_list, &ses->tcon_list);
2035         spin_unlock(&cifs_tcp_ses_lock);
2036
2037         cifs_fscache_get_super_cookie(tcon);
2038
2039         return tcon;
2040
2041 out_fail:
2042         tconInfoFree(tcon);
2043         return ERR_PTR(rc);
2044 }
2045
2046 void
2047 cifs_put_tlink(struct tcon_link *tlink)
2048 {
2049         if (!tlink || IS_ERR(tlink))
2050                 return;
2051
2052         if (!atomic_dec_and_test(&tlink->tl_count) ||
2053             test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2054                 tlink->tl_time = jiffies;
2055                 return;
2056         }
2057
2058         if (!IS_ERR(tlink_tcon(tlink)))
2059                 cifs_put_tcon(tlink_tcon(tlink));
2060         kfree(tlink);
2061         return;
2062 }
2063
2064 int
2065 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2066              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2067              struct dfs_info3_param **preferrals, int remap)
2068 {
2069         char *temp_unc;
2070         int rc = 0;
2071
2072         *pnum_referrals = 0;
2073         *preferrals = NULL;
2074
2075         if (pSesInfo->ipc_tid == 0) {
2076                 temp_unc = kmalloc(2 /* for slashes */ +
2077                         strnlen(pSesInfo->serverName,
2078                                 SERVER_NAME_LEN_WITH_NULL * 2)
2079                                  + 1 + 4 /* slash IPC$ */  + 2,
2080                                 GFP_KERNEL);
2081                 if (temp_unc == NULL)
2082                         return -ENOMEM;
2083                 temp_unc[0] = '\\';
2084                 temp_unc[1] = '\\';
2085                 strcpy(temp_unc + 2, pSesInfo->serverName);
2086                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2087                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2088                 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2089                 kfree(temp_unc);
2090         }
2091         if (rc == 0)
2092                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2093                                      pnum_referrals, nls_codepage, remap);
2094         /* BB map targetUNCs to dfs_info3 structures, here or
2095                 in CIFSGetDFSRefer BB */
2096
2097         return rc;
2098 }
2099
2100 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2101 static struct lock_class_key cifs_key[2];
2102 static struct lock_class_key cifs_slock_key[2];
2103
2104 static inline void
2105 cifs_reclassify_socket4(struct socket *sock)
2106 {
2107         struct sock *sk = sock->sk;
2108         BUG_ON(sock_owned_by_user(sk));
2109         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2110                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2111 }
2112
2113 static inline void
2114 cifs_reclassify_socket6(struct socket *sock)
2115 {
2116         struct sock *sk = sock->sk;
2117         BUG_ON(sock_owned_by_user(sk));
2118         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2119                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2120 }
2121 #else
2122 static inline void
2123 cifs_reclassify_socket4(struct socket *sock)
2124 {
2125 }
2126
2127 static inline void
2128 cifs_reclassify_socket6(struct socket *sock)
2129 {
2130 }
2131 #endif
2132
2133 /* See RFC1001 section 14 on representation of Netbios names */
2134 static void rfc1002mangle(char *target, char *source, unsigned int length)
2135 {
2136         unsigned int i, j;
2137
2138         for (i = 0, j = 0; i < (length); i++) {
2139                 /* mask a nibble at a time and encode */
2140                 target[j] = 'A' + (0x0F & (source[i] >> 4));
2141                 target[j+1] = 'A' + (0x0F & source[i]);
2142                 j += 2;
2143         }
2144
2145 }
2146
2147 static int
2148 bind_socket(struct TCP_Server_Info *server)
2149 {
2150         int rc = 0;
2151         if (server->srcaddr.ss_family != AF_UNSPEC) {
2152                 /* Bind to the specified local IP address */
2153                 struct socket *socket = server->ssocket;
2154                 rc = socket->ops->bind(socket,
2155                                        (struct sockaddr *) &server->srcaddr,
2156                                        sizeof(server->srcaddr));
2157                 if (rc < 0) {
2158                         struct sockaddr_in *saddr4;
2159                         struct sockaddr_in6 *saddr6;
2160                         saddr4 = (struct sockaddr_in *)&server->srcaddr;
2161                         saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2162                         if (saddr6->sin6_family == AF_INET6)
2163                                 cERROR(1, "cifs: "
2164                                        "Failed to bind to: %pI6c, error: %d\n",
2165                                        &saddr6->sin6_addr, rc);
2166                         else
2167                                 cERROR(1, "cifs: "
2168                                        "Failed to bind to: %pI4, error: %d\n",
2169                                        &saddr4->sin_addr.s_addr, rc);
2170                 }
2171         }
2172         return rc;
2173 }
2174
2175 static int
2176 ip_rfc1001_connect(struct TCP_Server_Info *server)
2177 {
2178         int rc = 0;
2179         /*
2180          * some servers require RFC1001 sessinit before sending
2181          * negprot - BB check reconnection in case where second
2182          * sessinit is sent but no second negprot
2183          */
2184         struct rfc1002_session_packet *ses_init_buf;
2185         struct smb_hdr *smb_buf;
2186         ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2187                                GFP_KERNEL);
2188         if (ses_init_buf) {
2189                 ses_init_buf->trailer.session_req.called_len = 32;
2190
2191                 if (server->server_RFC1001_name &&
2192                     server->server_RFC1001_name[0] != 0)
2193                         rfc1002mangle(ses_init_buf->trailer.
2194                                       session_req.called_name,
2195                                       server->server_RFC1001_name,
2196                                       RFC1001_NAME_LEN_WITH_NULL);
2197                 else
2198                         rfc1002mangle(ses_init_buf->trailer.
2199                                       session_req.called_name,
2200                                       DEFAULT_CIFS_CALLED_NAME,
2201                                       RFC1001_NAME_LEN_WITH_NULL);
2202
2203                 ses_init_buf->trailer.session_req.calling_len = 32;
2204
2205                 /*
2206                  * calling name ends in null (byte 16) from old smb
2207                  * convention.
2208                  */
2209                 if (server->workstation_RFC1001_name &&
2210                     server->workstation_RFC1001_name[0] != 0)
2211                         rfc1002mangle(ses_init_buf->trailer.
2212                                       session_req.calling_name,
2213                                       server->workstation_RFC1001_name,
2214                                       RFC1001_NAME_LEN_WITH_NULL);
2215                 else
2216                         rfc1002mangle(ses_init_buf->trailer.
2217                                       session_req.calling_name,
2218                                       "LINUX_CIFS_CLNT",
2219                                       RFC1001_NAME_LEN_WITH_NULL);
2220
2221                 ses_init_buf->trailer.session_req.scope1 = 0;
2222                 ses_init_buf->trailer.session_req.scope2 = 0;
2223                 smb_buf = (struct smb_hdr *)ses_init_buf;
2224
2225                 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2226                 smb_buf->smb_buf_length = 0x81000044;
2227                 rc = smb_send(server, smb_buf, 0x44);
2228                 kfree(ses_init_buf);
2229                 /*
2230                  * RFC1001 layer in at least one server
2231                  * requires very short break before negprot
2232                  * presumably because not expecting negprot
2233                  * to follow so fast.  This is a simple
2234                  * solution that works without
2235                  * complicating the code and causes no
2236                  * significant slowing down on mount
2237                  * for everyone else
2238                  */
2239                 usleep_range(1000, 2000);
2240         }
2241         /*
2242          * else the negprot may still work without this
2243          * even though malloc failed
2244          */
2245
2246         return rc;
2247 }
2248
2249 static int
2250 generic_ip_connect(struct TCP_Server_Info *server)
2251 {
2252         int rc = 0;
2253         unsigned short int sport;
2254         int slen, sfamily;
2255         struct socket *socket = server->ssocket;
2256         struct sockaddr *saddr;
2257
2258         saddr = (struct sockaddr *) &server->dstaddr;
2259
2260         if (server->dstaddr.ss_family == AF_INET6) {
2261                 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2262                 slen = sizeof(struct sockaddr_in6);
2263                 sfamily = AF_INET6;
2264         } else {
2265                 sport = ((struct sockaddr_in *) saddr)->sin_port;
2266                 slen = sizeof(struct sockaddr_in);
2267                 sfamily = AF_INET;
2268         }
2269
2270         if (socket == NULL) {
2271                 rc = sock_create_kern(sfamily, SOCK_STREAM,
2272                                       IPPROTO_TCP, &socket);
2273                 if (rc < 0) {
2274                         cERROR(1, "Error %d creating socket", rc);
2275                         server->ssocket = NULL;
2276                         return rc;
2277                 }
2278
2279                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2280                 cFYI(1, "Socket created");
2281                 server->ssocket = socket;
2282                 socket->sk->sk_allocation = GFP_NOFS;
2283                 if (sfamily == AF_INET6)
2284                         cifs_reclassify_socket6(socket);
2285                 else
2286                         cifs_reclassify_socket4(socket);
2287         }
2288
2289         rc = bind_socket(server);
2290         if (rc < 0)
2291                 return rc;
2292
2293         rc = socket->ops->connect(socket, saddr, slen, 0);
2294         if (rc < 0) {
2295                 cFYI(1, "Error %d connecting to server", rc);
2296                 sock_release(socket);
2297                 server->ssocket = NULL;
2298                 return rc;
2299         }
2300
2301         /*
2302          * Eventually check for other socket options to change from
2303          * the default. sock_setsockopt not used because it expects
2304          * user space buffer
2305          */
2306         socket->sk->sk_rcvtimeo = 7 * HZ;
2307         socket->sk->sk_sndtimeo = 5 * HZ;
2308
2309         /* make the bufsizes depend on wsize/rsize and max requests */
2310         if (server->noautotune) {
2311                 if (socket->sk->sk_sndbuf < (200 * 1024))
2312                         socket->sk->sk_sndbuf = 200 * 1024;
2313                 if (socket->sk->sk_rcvbuf < (140 * 1024))
2314                         socket->sk->sk_rcvbuf = 140 * 1024;
2315         }
2316
2317         if (server->tcp_nodelay) {
2318                 int val = 1;
2319                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2320                                 (char *)&val, sizeof(val));
2321                 if (rc)
2322                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2323         }
2324
2325          cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2326                  socket->sk->sk_sndbuf,
2327                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2328
2329         if (sport == htons(RFC1001_PORT))
2330                 rc = ip_rfc1001_connect(server);
2331
2332         return rc;
2333 }
2334
2335 static int
2336 ip_connect(struct TCP_Server_Info *server)
2337 {
2338         unsigned short int *sport;
2339         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2340         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2341
2342         if (server->dstaddr.ss_family == AF_INET6)
2343                 sport = &addr6->sin6_port;
2344         else
2345                 sport = &addr->sin_port;
2346
2347         if (*sport == 0) {
2348                 int rc;
2349
2350                 /* try with 445 port at first */
2351                 *sport = htons(CIFS_PORT);
2352
2353                 rc = generic_ip_connect(server);
2354                 if (rc >= 0)
2355                         return rc;
2356
2357                 /* if it failed, try with 139 port */
2358                 *sport = htons(RFC1001_PORT);
2359         }
2360
2361         return generic_ip_connect(server);
2362 }
2363
2364 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2365                           struct super_block *sb, struct smb_vol *vol_info)
2366 {
2367         /* if we are reconnecting then should we check to see if
2368          * any requested capabilities changed locally e.g. via
2369          * remount but we can not do much about it here
2370          * if they have (even if we could detect it by the following)
2371          * Perhaps we could add a backpointer to array of sb from tcon
2372          * or if we change to make all sb to same share the same
2373          * sb as NFS - then we only have one backpointer to sb.
2374          * What if we wanted to mount the server share twice once with
2375          * and once without posixacls or posix paths? */
2376         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2377
2378         if (vol_info && vol_info->no_linux_ext) {
2379                 tcon->fsUnixInfo.Capability = 0;
2380                 tcon->unix_ext = 0; /* Unix Extensions disabled */
2381                 cFYI(1, "Linux protocol extensions disabled");
2382                 return;
2383         } else if (vol_info)
2384                 tcon->unix_ext = 1; /* Unix Extensions supported */
2385
2386         if (tcon->unix_ext == 0) {
2387                 cFYI(1, "Unix extensions disabled so not set on reconnect");
2388                 return;
2389         }
2390
2391         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2392                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2393
2394                 /* check for reconnect case in which we do not
2395                    want to change the mount behavior if we can avoid it */
2396                 if (vol_info == NULL) {
2397                         /* turn off POSIX ACL and PATHNAMES if not set
2398                            originally at mount time */
2399                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2400                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2401                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2402                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2403                                         cERROR(1, "POSIXPATH support change");
2404                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2405                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2406                                 cERROR(1, "possible reconnect error");
2407                                 cERROR(1, "server disabled POSIX path support");
2408                         }
2409                 }
2410
2411                 cap &= CIFS_UNIX_CAP_MASK;
2412                 if (vol_info && vol_info->no_psx_acl)
2413                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2414                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2415                         cFYI(1, "negotiated posix acl support");
2416                         if (sb)
2417                                 sb->s_flags |= MS_POSIXACL;
2418                 }
2419
2420                 if (vol_info && vol_info->posix_paths == 0)
2421                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2422                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2423                         cFYI(1, "negotiate posix pathnames");
2424                         if (sb)
2425                                 CIFS_SB(sb)->mnt_cifs_flags |=
2426                                         CIFS_MOUNT_POSIX_PATHS;
2427                 }
2428
2429                 /* We might be setting the path sep back to a different
2430                 form if we are reconnecting and the server switched its
2431                 posix path capability for this share */
2432                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2433                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2434
2435                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2436                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2437                                 CIFS_SB(sb)->rsize = 127 * 1024;
2438                                 cFYI(DBG2, "larger reads not supported by srv");
2439                         }
2440                 }
2441
2442
2443                 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2444 #ifdef CONFIG_CIFS_DEBUG2
2445                 if (cap & CIFS_UNIX_FCNTL_CAP)
2446                         cFYI(1, "FCNTL cap");
2447                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2448                         cFYI(1, "EXTATTR cap");
2449                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2450                         cFYI(1, "POSIX path cap");
2451                 if (cap & CIFS_UNIX_XATTR_CAP)
2452                         cFYI(1, "XATTR cap");
2453                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2454                         cFYI(1, "POSIX ACL cap");
2455                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2456                         cFYI(1, "very large read cap");
2457                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2458                         cFYI(1, "very large write cap");
2459 #endif /* CIFS_DEBUG2 */
2460                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2461                         if (vol_info == NULL) {
2462                                 cFYI(1, "resetting capabilities failed");
2463                         } else
2464                                 cERROR(1, "Negotiating Unix capabilities "
2465                                            "with the server failed.  Consider "
2466                                            "mounting with the Unix Extensions\n"
2467                                            "disabled, if problems are found, "
2468                                            "by specifying the nounix mount "
2469                                            "option.");
2470
2471                 }
2472         }
2473 }
2474
2475 static void
2476 convert_delimiter(char *path, char delim)
2477 {
2478         int i;
2479         char old_delim;
2480
2481         if (path == NULL)
2482                 return;
2483
2484         if (delim == '/')
2485                 old_delim = '\\';
2486         else
2487                 old_delim = '/';
2488
2489         for (i = 0; path[i] != '\0'; i++) {
2490                 if (path[i] == old_delim)
2491                         path[i] = delim;
2492         }
2493 }
2494
2495 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2496                           struct cifs_sb_info *cifs_sb)
2497 {
2498         INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2499
2500         if (pvolume_info->rsize > CIFSMaxBufSize) {
2501                 cERROR(1, "rsize %d too large, using MaxBufSize",
2502                         pvolume_info->rsize);
2503                 cifs_sb->rsize = CIFSMaxBufSize;
2504         } else if ((pvolume_info->rsize) &&
2505                         (pvolume_info->rsize <= CIFSMaxBufSize))
2506                 cifs_sb->rsize = pvolume_info->rsize;
2507         else /* default */
2508                 cifs_sb->rsize = CIFSMaxBufSize;
2509
2510         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2511                 cERROR(1, "wsize %d too large, using 4096 instead",
2512                           pvolume_info->wsize);
2513                 cifs_sb->wsize = 4096;
2514         } else if (pvolume_info->wsize)
2515                 cifs_sb->wsize = pvolume_info->wsize;
2516         else
2517                 cifs_sb->wsize = min_t(const int,
2518                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2519                                         127*1024);
2520                 /* old default of CIFSMaxBufSize was too small now
2521                    that SMB Write2 can send multiple pages in kvec.
2522                    RFC1001 does not describe what happens when frame
2523                    bigger than 128K is sent so use that as max in
2524                    conjunction with 52K kvec constraint on arch with 4K
2525                    page size  */
2526
2527         if (cifs_sb->rsize < 2048) {
2528                 cifs_sb->rsize = 2048;
2529                 /* Windows ME may prefer this */
2530                 cFYI(1, "readsize set to minimum: 2048");
2531         }
2532         /* calculate prepath */
2533         cifs_sb->prepath = pvolume_info->prepath;
2534         if (cifs_sb->prepath) {
2535                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2536                 /* we can not convert the / to \ in the path
2537                 separators in the prefixpath yet because we do not
2538                 know (until reset_cifs_unix_caps is called later)
2539                 whether POSIX PATH CAP is available. We normalize
2540                 the / to \ after reset_cifs_unix_caps is called */
2541                 pvolume_info->prepath = NULL;
2542         } else
2543                 cifs_sb->prepathlen = 0;
2544         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2545         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2546         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2547         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2548         cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
2549                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2550
2551         cifs_sb->actimeo = pvolume_info->actimeo;
2552
2553         if (pvolume_info->noperm)
2554                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2555         if (pvolume_info->setuids)
2556                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2557         if (pvolume_info->server_ino)
2558                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2559         if (pvolume_info->remap)
2560                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2561         if (pvolume_info->no_xattr)
2562                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2563         if (pvolume_info->sfu_emul)
2564                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2565         if (pvolume_info->nobrl)
2566                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2567         if (pvolume_info->nostrictsync)
2568                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2569         if (pvolume_info->mand_lock)
2570                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2571         if (pvolume_info->cifs_acl)
2572                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2573         if (pvolume_info->override_uid)
2574                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2575         if (pvolume_info->override_gid)
2576                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2577         if (pvolume_info->dynperm)
2578                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2579         if (pvolume_info->fsc)
2580                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2581         if (pvolume_info->multiuser)
2582                 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2583                                             CIFS_MOUNT_NO_PERM);
2584         if (pvolume_info->direct_io) {
2585                 cFYI(1, "mounting share using direct i/o");
2586                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2587         }
2588         if (pvolume_info->mfsymlinks) {
2589                 if (pvolume_info->sfu_emul) {
2590                         cERROR(1,  "mount option mfsymlinks ignored if sfu "
2591                                    "mount option is used");
2592                 } else {
2593                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2594                 }
2595         }
2596
2597         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2598                 cERROR(1, "mount option dynperm ignored if cifsacl "
2599                            "mount option supported");
2600 }
2601
2602 static int
2603 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2604                    struct cifs_sb_info *cifs_sb, const char *full_path)
2605 {
2606         int rc;
2607         FILE_ALL_INFO *pfile_info;
2608
2609         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2610         if (pfile_info == NULL)
2611                 return -ENOMEM;
2612
2613         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2614                               0 /* not legacy */, cifs_sb->local_nls,
2615                               cifs_sb->mnt_cifs_flags &
2616                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2617         kfree(pfile_info);
2618         return rc;
2619 }
2620
2621 static void
2622 cleanup_volume_info(struct smb_vol **pvolume_info)
2623 {
2624         struct smb_vol *volume_info;
2625
2626         if (!pvolume_info || !*pvolume_info)
2627                 return;
2628
2629         volume_info = *pvolume_info;
2630         kzfree(volume_info->password);
2631         kfree(volume_info->UNC);
2632         kfree(volume_info->prepath);
2633         kfree(volume_info);
2634         *pvolume_info = NULL;
2635         return;
2636 }
2637
2638 #ifdef CONFIG_CIFS_DFS_UPCALL
2639 /* build_path_to_root returns full path to root when
2640  * we do not have an exiting connection (tcon) */
2641 static char *
2642 build_unc_path_to_root(const struct smb_vol *volume_info,
2643                 const struct cifs_sb_info *cifs_sb)
2644 {
2645         char *full_path;
2646
2647         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2648         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2649         if (full_path == NULL)
2650                 return ERR_PTR(-ENOMEM);
2651
2652         strncpy(full_path, volume_info->UNC, unc_len);
2653         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2654                 int i;
2655                 for (i = 0; i < unc_len; i++) {
2656                         if (full_path[i] == '\\')
2657                                 full_path[i] = '/';
2658                 }
2659         }
2660
2661         if (cifs_sb->prepathlen)
2662                 strncpy(full_path + unc_len, cifs_sb->prepath,
2663                                 cifs_sb->prepathlen);
2664
2665         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2666         return full_path;
2667 }
2668 #endif
2669
2670 int
2671 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2672                 char *mount_data_global, const char *devname)
2673 {
2674         int rc;
2675         int xid;
2676         struct smb_vol *volume_info;
2677         struct cifsSesInfo *pSesInfo;
2678         struct cifsTconInfo *tcon;
2679         struct TCP_Server_Info *srvTcp;
2680         char   *full_path;
2681         char *mount_data = mount_data_global;
2682         struct tcon_link *tlink;
2683 #ifdef CONFIG_CIFS_DFS_UPCALL
2684         struct dfs_info3_param *referrals = NULL;
2685         unsigned int num_referrals = 0;
2686         int referral_walks_count = 0;
2687 try_mount_again:
2688 #endif
2689         rc = 0;
2690         tcon = NULL;
2691         pSesInfo = NULL;
2692         srvTcp = NULL;
2693         full_path = NULL;
2694         tlink = NULL;
2695
2696         xid = GetXid();
2697
2698         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2699         if (!volume_info) {
2700                 rc = -ENOMEM;
2701                 goto out;
2702         }
2703
2704         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2705                 rc = -EINVAL;
2706                 goto out;
2707         }
2708
2709         if (volume_info->nullauth) {
2710                 cFYI(1, "null user");
2711                 volume_info->username = "";
2712         } else if (volume_info->username) {
2713                 /* BB fixme parse for domain name here */
2714                 cFYI(1, "Username: %s", volume_info->username);
2715         } else {
2716                 cifserror("No username specified");
2717         /* In userspace mount helper we can get user name from alternate
2718            locations such as env variables and files on disk */
2719                 rc = -EINVAL;
2720                 goto out;
2721         }
2722
2723         /* this is needed for ASCII cp to Unicode converts */
2724         if (volume_info->iocharset == NULL) {
2725                 /* load_nls_default cannot return null */
2726                 volume_info->local_nls = load_nls_default();
2727         } else {
2728                 volume_info->local_nls = load_nls(volume_info->iocharset);
2729                 if (volume_info->local_nls == NULL) {
2730                         cERROR(1, "CIFS mount error: iocharset %s not found",
2731                                  volume_info->iocharset);
2732                         rc = -ELIBACC;
2733                         goto out;
2734                 }
2735         }
2736         cifs_sb->local_nls = volume_info->local_nls;
2737
2738         /* get a reference to a tcp session */
2739         srvTcp = cifs_get_tcp_session(volume_info);
2740         if (IS_ERR(srvTcp)) {
2741                 rc = PTR_ERR(srvTcp);
2742                 goto out;
2743         }
2744
2745         /* get a reference to a SMB session */
2746         pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2747         if (IS_ERR(pSesInfo)) {
2748                 rc = PTR_ERR(pSesInfo);
2749                 pSesInfo = NULL;
2750                 goto mount_fail_check;
2751         }
2752
2753         setup_cifs_sb(volume_info, cifs_sb);
2754         if (pSesInfo->capabilities & CAP_LARGE_FILES)
2755                 sb->s_maxbytes = MAX_LFS_FILESIZE;
2756         else
2757                 sb->s_maxbytes = MAX_NON_LFS;
2758
2759         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2760         sb->s_time_gran = 100;
2761
2762         /* search for existing tcon to this server share */
2763         tcon = cifs_get_tcon(pSesInfo, volume_info);
2764         if (IS_ERR(tcon)) {
2765                 rc = PTR_ERR(tcon);
2766                 tcon = NULL;
2767                 goto remote_path_check;
2768         }
2769
2770         /* do not care if following two calls succeed - informational */
2771         if (!tcon->ipc) {
2772                 CIFSSMBQFSDeviceInfo(xid, tcon);
2773                 CIFSSMBQFSAttributeInfo(xid, tcon);
2774         }
2775
2776         /* tell server which Unix caps we support */
2777         if (tcon->ses->capabilities & CAP_UNIX)
2778                 /* reset of caps checks mount to see if unix extensions
2779                    disabled for just this mount */
2780                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2781         else
2782                 tcon->unix_ext = 0; /* server does not support them */
2783
2784         /* convert forward to back slashes in prepath here if needed */
2785         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2786                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2787
2788         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2789                 cifs_sb->rsize = 1024 * 127;
2790                 cFYI(DBG2, "no very large read support, rsize now 127K");
2791         }
2792         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2793                 cifs_sb->wsize = min(cifs_sb->wsize,
2794                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2795         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2796                 cifs_sb->rsize = min(cifs_sb->rsize,
2797                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2798
2799 remote_path_check:
2800         /* check if a whole path (including prepath) is not remote */
2801         if (!rc && cifs_sb->prepathlen && tcon) {
2802                 /* build_path_to_root works only when we have a valid tcon */
2803                 full_path = cifs_build_path_to_root(cifs_sb, tcon);
2804                 if (full_path == NULL) {
2805                         rc = -ENOMEM;
2806                         goto mount_fail_check;
2807                 }
2808                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2809                 if (rc != 0 && rc != -EREMOTE) {
2810                         kfree(full_path);
2811                         goto mount_fail_check;
2812                 }
2813                 kfree(full_path);
2814         }
2815
2816         /* get referral if needed */
2817         if (rc == -EREMOTE) {
2818 #ifdef CONFIG_CIFS_DFS_UPCALL
2819                 if (referral_walks_count > MAX_NESTED_LINKS) {
2820                         /*
2821                          * BB: when we implement proper loop detection,
2822                          *     we will remove this check. But now we need it
2823                          *     to prevent an indefinite loop if 'DFS tree' is
2824                          *     misconfigured (i.e. has loops).
2825                          */
2826                         rc = -ELOOP;
2827                         goto mount_fail_check;
2828                 }
2829                 /* convert forward to back slashes in prepath here if needed */
2830                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2831                         convert_delimiter(cifs_sb->prepath,
2832                                         CIFS_DIR_SEP(cifs_sb));
2833                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2834                 if (IS_ERR(full_path)) {
2835                         rc = PTR_ERR(full_path);
2836                         goto mount_fail_check;
2837                 }
2838
2839                 cFYI(1, "Getting referral for: %s", full_path);
2840                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2841                         cifs_sb->local_nls, &num_referrals, &referrals,
2842                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2843                 if (!rc && num_referrals > 0) {
2844                         char *fake_devname = NULL;
2845
2846                         if (mount_data != mount_data_global)
2847                                 kfree(mount_data);
2848
2849                         mount_data = cifs_compose_mount_options(
2850                                         cifs_sb->mountdata, full_path + 1,
2851                                         referrals, &fake_devname);
2852
2853                         free_dfs_info_array(referrals, num_referrals);
2854                         kfree(fake_devname);
2855                         kfree(full_path);
2856
2857                         if (IS_ERR(mount_data)) {
2858                                 rc = PTR_ERR(mount_data);
2859                                 mount_data = NULL;
2860                                 goto mount_fail_check;
2861                         }
2862
2863                         if (tcon)
2864                                 cifs_put_tcon(tcon);
2865                         else if (pSesInfo)
2866                                 cifs_put_smb_ses(pSesInfo);
2867
2868                         cleanup_volume_info(&volume_info);
2869                         referral_walks_count++;
2870                         FreeXid(xid);
2871                         goto try_mount_again;
2872                 }
2873 #else /* No DFS support, return error on mount */
2874                 rc = -EOPNOTSUPP;
2875 #endif
2876         }
2877
2878         if (rc)
2879                 goto mount_fail_check;
2880
2881         /* now, hang the tcon off of the superblock */
2882         tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2883         if (tlink == NULL) {
2884                 rc = -ENOMEM;
2885                 goto mount_fail_check;
2886         }
2887
2888         tlink->tl_uid = pSesInfo->linux_uid;
2889         tlink->tl_tcon = tcon;
2890         tlink->tl_time = jiffies;
2891         set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2892         set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2893
2894         cifs_sb->master_tlink = tlink;
2895         spin_lock(&cifs_sb->tlink_tree_lock);
2896         tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
2897         spin_unlock(&cifs_sb->tlink_tree_lock);
2898
2899         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
2900                                 TLINK_IDLE_EXPIRE);
2901
2902 mount_fail_check:
2903         /* on error free sesinfo and tcon struct if needed */
2904         if (rc) {
2905                 if (mount_data != mount_data_global)
2906                         kfree(mount_data);
2907                 /* If find_unc succeeded then rc == 0 so we can not end */
2908                 /* up accidently freeing someone elses tcon struct */
2909                 if (tcon)
2910                         cifs_put_tcon(tcon);
2911                 else if (pSesInfo)
2912                         cifs_put_smb_ses(pSesInfo);
2913                 else
2914                         cifs_put_tcp_session(srvTcp);
2915                 goto out;
2916         }
2917
2918         /* volume_info->password is freed above when existing session found
2919         (in which case it is not needed anymore) but when new sesion is created
2920         the password ptr is put in the new session structure (in which case the
2921         password will be freed at unmount time) */
2922 out:
2923         /* zero out password before freeing */
2924         cleanup_volume_info(&volume_info);
2925         FreeXid(xid);
2926         return rc;
2927 }
2928
2929 int
2930 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2931          const char *tree, struct cifsTconInfo *tcon,
2932          const struct nls_table *nls_codepage)
2933 {
2934         struct smb_hdr *smb_buffer;
2935         struct smb_hdr *smb_buffer_response;
2936         TCONX_REQ *pSMB;
2937         TCONX_RSP *pSMBr;
2938         unsigned char *bcc_ptr;
2939         int rc = 0;
2940         int length, bytes_left;
2941         __u16 count;
2942
2943         if (ses == NULL)
2944                 return -EIO;
2945
2946         smb_buffer = cifs_buf_get();
2947         if (smb_buffer == NULL)
2948                 return -ENOMEM;
2949
2950         smb_buffer_response = smb_buffer;
2951
2952         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2953                         NULL /*no tid */ , 4 /*wct */ );
2954
2955         smb_buffer->Mid = GetNextMid(ses->server);
2956         smb_buffer->Uid = ses->Suid;
2957         pSMB = (TCONX_REQ *) smb_buffer;
2958         pSMBr = (TCONX_RSP *) smb_buffer_response;
2959
2960         pSMB->AndXCommand = 0xFF;
2961         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2962         bcc_ptr = &pSMB->Password[0];
2963         if ((ses->server->secMode) & SECMODE_USER) {
2964                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2965                 *bcc_ptr = 0; /* password is null byte */
2966                 bcc_ptr++;              /* skip password */
2967                 /* already aligned so no need to do it below */
2968         } else {
2969                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2970                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2971                    specified as required (when that support is added to
2972                    the vfs in the future) as only NTLM or the much
2973                    weaker LANMAN (which we do not send by default) is accepted
2974                    by Samba (not sure whether other servers allow
2975                    NTLMv2 password here) */
2976 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2977                 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2978                     (ses->server->secType == LANMAN))
2979                         calc_lanman_hash(tcon->password, ses->server->cryptkey,
2980                                          ses->server->secMode &
2981                                             SECMODE_PW_ENCRYPT ? true : false,
2982                                          bcc_ptr);
2983                 else
2984 #endif /* CIFS_WEAK_PW_HASH */
2985                 SMBNTencrypt(tcon->password, ses->server->cryptkey, bcc_ptr);
2986
2987                 bcc_ptr += CIFS_SESS_KEY_SIZE;
2988                 if (ses->capabilities & CAP_UNICODE) {
2989                         /* must align unicode strings */
2990                         *bcc_ptr = 0; /* null byte password */
2991                         bcc_ptr++;
2992                 }
2993         }
2994
2995         if (ses->server->secMode &
2996                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2997                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2998
2999         if (ses->capabilities & CAP_STATUS32) {
3000                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3001         }
3002         if (ses->capabilities & CAP_DFS) {
3003                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3004         }
3005         if (ses->capabilities & CAP_UNICODE) {
3006                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3007                 length =
3008                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3009                         6 /* max utf8 char length in bytes */ *
3010                         (/* server len*/ + 256 /* share len */), nls_codepage);
3011                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3012                 bcc_ptr += 2;   /* skip trailing null */
3013         } else {                /* ASCII */
3014                 strcpy(bcc_ptr, tree);
3015                 bcc_ptr += strlen(tree) + 1;
3016         }
3017         strcpy(bcc_ptr, "?????");
3018         bcc_ptr += strlen("?????");
3019         bcc_ptr += 1;
3020         count = bcc_ptr - &pSMB->Password[0];
3021         pSMB->hdr.smb_buf_length += count;
3022         pSMB->ByteCount = cpu_to_le16(count);
3023
3024         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3025                          CIFS_STD_OP);
3026
3027         /* above now done in SendReceive */
3028         if ((rc == 0) && (tcon != NULL)) {
3029                 bool is_unicode;
3030
3031                 tcon->tidStatus = CifsGood;
3032                 tcon->need_reconnect = false;
3033                 tcon->tid = smb_buffer_response->Tid;
3034                 bcc_ptr = pByteArea(smb_buffer_response);
3035                 bytes_left = BCC(smb_buffer_response);
3036                 length = strnlen(bcc_ptr, bytes_left - 2);
3037                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3038                         is_unicode = true;
3039                 else
3040                         is_unicode = false;
3041
3042
3043                 /* skip service field (NB: this field is always ASCII) */
3044                 if (length == 3) {
3045                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3046                             (bcc_ptr[2] == 'C')) {
3047                                 cFYI(1, "IPC connection");
3048                                 tcon->ipc = 1;
3049                         }
3050                 } else if (length == 2) {
3051                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3052                                 /* the most common case */
3053                                 cFYI(1, "disk share connection");
3054                         }
3055                 }
3056                 bcc_ptr += length + 1;
3057                 bytes_left -= (length + 1);
3058                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3059
3060                 /* mostly informational -- no need to fail on error here */
3061                 kfree(tcon->nativeFileSystem);
3062                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3063                                                       bytes_left, is_unicode,
3064                                                       nls_codepage);
3065
3066                 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3067
3068                 if ((smb_buffer_response->WordCount == 3) ||
3069                          (smb_buffer_response->WordCount == 7))
3070                         /* field is in same location */
3071                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3072                 else
3073                         tcon->Flags = 0;
3074                 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3075         } else if ((rc == 0) && tcon == NULL) {
3076                 /* all we need to save for IPC$ connection */
3077                 ses->ipc_tid = smb_buffer_response->Tid;
3078         }
3079
3080         cifs_buf_release(smb_buffer);
3081         return rc;
3082 }
3083
3084 int
3085 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3086 {
3087         struct rb_root *root = &cifs_sb->tlink_tree;
3088         struct rb_node *node;
3089         struct tcon_link *tlink;
3090         char *tmp;
3091
3092         cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3093
3094         spin_lock(&cifs_sb->tlink_tree_lock);
3095         while ((node = rb_first(root))) {
3096                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3097                 cifs_get_tlink(tlink);
3098                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3099                 rb_erase(node, root);
3100
3101                 spin_unlock(&cifs_sb->tlink_tree_lock);
3102                 cifs_put_tlink(tlink);
3103                 spin_lock(&cifs_sb->tlink_tree_lock);
3104         }
3105         spin_unlock(&cifs_sb->tlink_tree_lock);
3106
3107         tmp = cifs_sb->prepath;
3108         cifs_sb->prepathlen = 0;
3109         cifs_sb->prepath = NULL;
3110         kfree(tmp);
3111
3112         return 0;
3113 }
3114
3115 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3116 {
3117         int rc = 0;
3118         struct TCP_Server_Info *server = ses->server;
3119
3120         /* only send once per connect */
3121         if (server->maxBuf != 0)
3122                 return 0;
3123
3124         rc = CIFSSMBNegotiate(xid, ses);
3125         if (rc == -EAGAIN) {
3126                 /* retry only once on 1st time connection */
3127                 rc = CIFSSMBNegotiate(xid, ses);
3128                 if (rc == -EAGAIN)
3129                         rc = -EHOSTDOWN;
3130         }
3131         if (rc == 0) {
3132                 spin_lock(&GlobalMid_Lock);
3133                 if (server->tcpStatus != CifsExiting)
3134                         server->tcpStatus = CifsGood;
3135                 else
3136                         rc = -EHOSTDOWN;
3137                 spin_unlock(&GlobalMid_Lock);
3138
3139         }
3140
3141         return rc;
3142 }
3143
3144
3145 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3146                         struct nls_table *nls_info)
3147 {
3148         int rc = 0;
3149         struct TCP_Server_Info *server = ses->server;
3150
3151         ses->flags = 0;
3152         ses->capabilities = server->capabilities;
3153         if (linuxExtEnabled == 0)
3154                 ses->capabilities &= (~CAP_UNIX);
3155
3156         cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3157                  server->secMode, server->capabilities, server->timeAdj);
3158
3159         rc = CIFS_SessSetup(xid, ses, nls_info);
3160         if (rc) {
3161                 cERROR(1, "Send error in SessSetup = %d", rc);
3162         } else {
3163                 mutex_lock(&ses->server->srv_mutex);
3164                 if (!server->session_estab) {
3165                         server->session_key.response = ses->auth_key.response;
3166                         server->session_key.len = ses->auth_key.len;
3167                         server->sequence_number = 0x2;
3168                         server->session_estab = true;
3169                         ses->auth_key.response = NULL;
3170                 }
3171                 mutex_unlock(&server->srv_mutex);
3172
3173                 cFYI(1, "CIFS Session Established successfully");
3174                 spin_lock(&GlobalMid_Lock);
3175                 ses->status = CifsGood;
3176                 ses->need_reconnect = false;
3177                 spin_unlock(&GlobalMid_Lock);
3178         }
3179
3180         kfree(ses->auth_key.response);
3181         ses->auth_key.response = NULL;
3182         ses->auth_key.len = 0;
3183         kfree(ses->ntlmssp);
3184         ses->ntlmssp = NULL;
3185
3186         return rc;
3187 }
3188
3189 static struct cifsTconInfo *
3190 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3191 {
3192         struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3193         struct cifsSesInfo *ses;
3194         struct cifsTconInfo *tcon = NULL;
3195         struct smb_vol *vol_info;
3196         char username[MAX_USERNAME_SIZE + 1];
3197
3198         vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3199         if (vol_info == NULL) {
3200                 tcon = ERR_PTR(-ENOMEM);
3201                 goto out;
3202         }
3203
3204         snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3205         vol_info->username = username;
3206         vol_info->local_nls = cifs_sb->local_nls;
3207         vol_info->linux_uid = fsuid;
3208         vol_info->cred_uid = fsuid;
3209         vol_info->UNC = master_tcon->treeName;
3210         vol_info->retry = master_tcon->retry;
3211         vol_info->nocase = master_tcon->nocase;
3212         vol_info->local_lease = master_tcon->local_lease;
3213         vol_info->no_linux_ext = !master_tcon->unix_ext;
3214
3215         /* FIXME: allow for other secFlg settings */
3216         vol_info->secFlg = CIFSSEC_MUST_KRB5;
3217
3218         /* get a reference for the same TCP session */
3219         spin_lock(&cifs_tcp_ses_lock);
3220         ++master_tcon->ses->server->srv_count;
3221         spin_unlock(&cifs_tcp_ses_lock);
3222
3223         ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3224         if (IS_ERR(ses)) {
3225                 tcon = (struct cifsTconInfo *)ses;
3226                 cifs_put_tcp_session(master_tcon->ses->server);
3227                 goto out;
3228         }
3229
3230         tcon = cifs_get_tcon(ses, vol_info);
3231         if (IS_ERR(tcon)) {
3232                 cifs_put_smb_ses(ses);
3233                 goto out;
3234         }
3235
3236         if (ses->capabilities & CAP_UNIX)
3237                 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3238 out:
3239         kfree(vol_info);
3240
3241         return tcon;
3242 }
3243
3244 static inline struct tcon_link *
3245 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3246 {
3247         return cifs_sb->master_tlink;
3248 }
3249
3250 struct cifsTconInfo *
3251 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3252 {
3253         return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3254 }
3255
3256 static int
3257 cifs_sb_tcon_pending_wait(void *unused)
3258 {
3259         schedule();
3260         return signal_pending(current) ? -ERESTARTSYS : 0;
3261 }
3262
3263 /* find and return a tlink with given uid */
3264 static struct tcon_link *
3265 tlink_rb_search(struct rb_root *root, uid_t uid)
3266 {
3267         struct rb_node *node = root->rb_node;
3268         struct tcon_link *tlink;
3269
3270         while (node) {
3271                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3272
3273                 if (tlink->tl_uid > uid)
3274                         node = node->rb_left;
3275                 else if (tlink->tl_uid < uid)
3276                         node = node->rb_right;
3277                 else
3278                         return tlink;
3279         }
3280         return NULL;
3281 }
3282
3283 /* insert a tcon_link into the tree */
3284 static void
3285 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3286 {
3287         struct rb_node **new = &(root->rb_node), *parent = NULL;
3288         struct tcon_link *tlink;
3289
3290         while (*new) {
3291                 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3292                 parent = *new;
3293
3294                 if (tlink->tl_uid > new_tlink->tl_uid)
3295                         new = &((*new)->rb_left);
3296                 else
3297                         new = &((*new)->rb_right);
3298         }
3299
3300         rb_link_node(&new_tlink->tl_rbnode, parent, new);
3301         rb_insert_color(&new_tlink->tl_rbnode, root);
3302 }
3303
3304 /*
3305  * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3306  * current task.
3307  *
3308  * If the superblock doesn't refer to a multiuser mount, then just return
3309  * the master tcon for the mount.
3310  *
3311  * First, search the rbtree for an existing tcon for this fsuid. If one
3312  * exists, then check to see if it's pending construction. If it is then wait
3313  * for construction to complete. Once it's no longer pending, check to see if
3314  * it failed and either return an error or retry construction, depending on
3315  * the timeout.
3316  *
3317  * If one doesn't exist then insert a new tcon_link struct into the tree and
3318  * try to construct a new one.
3319  */
3320 struct tcon_link *
3321 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3322 {
3323         int ret;
3324         uid_t fsuid = current_fsuid();
3325         struct tcon_link *tlink, *newtlink;
3326
3327         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3328                 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3329
3330         spin_lock(&cifs_sb->tlink_tree_lock);
3331         tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3332         if (tlink)
3333                 cifs_get_tlink(tlink);
3334         spin_unlock(&cifs_sb->tlink_tree_lock);
3335
3336         if (tlink == NULL) {
3337                 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3338                 if (newtlink == NULL)
3339                         return ERR_PTR(-ENOMEM);
3340                 newtlink->tl_uid = fsuid;
3341                 newtlink->tl_tcon = ERR_PTR(-EACCES);
3342                 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3343                 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3344                 cifs_get_tlink(newtlink);
3345
3346                 spin_lock(&cifs_sb->tlink_tree_lock);
3347                 /* was one inserted after previous search? */
3348                 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3349                 if (tlink) {
3350                         cifs_get_tlink(tlink);
3351                         spin_unlock(&cifs_sb->tlink_tree_lock);
3352                         kfree(newtlink);
3353                         goto wait_for_construction;
3354                 }
3355                 tlink = newtlink;
3356                 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3357                 spin_unlock(&cifs_sb->tlink_tree_lock);
3358         } else {
3359 wait_for_construction:
3360                 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3361                                   cifs_sb_tcon_pending_wait,
3362                                   TASK_INTERRUPTIBLE);
3363                 if (ret) {
3364                         cifs_put_tlink(tlink);
3365                         return ERR_PTR(ret);
3366                 }
3367
3368                 /* if it's good, return it */
3369                 if (!IS_ERR(tlink->tl_tcon))
3370                         return tlink;
3371
3372                 /* return error if we tried this already recently */
3373                 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3374                         cifs_put_tlink(tlink);
3375                         return ERR_PTR(-EACCES);
3376                 }
3377
3378                 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3379                         goto wait_for_construction;
3380         }
3381
3382         tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3383         clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3384         wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3385
3386         if (IS_ERR(tlink->tl_tcon)) {
3387                 cifs_put_tlink(tlink);
3388                 return ERR_PTR(-EACCES);
3389         }
3390
3391         return tlink;
3392 }
3393
3394 /*
3395  * periodic workqueue job that scans tcon_tree for a superblock and closes
3396  * out tcons.
3397  */
3398 static void
3399 cifs_prune_tlinks(struct work_struct *work)
3400 {
3401         struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3402                                                     prune_tlinks.work);
3403         struct rb_root *root = &cifs_sb->tlink_tree;
3404         struct rb_node *node = rb_first(root);
3405         struct rb_node *tmp;
3406         struct tcon_link *tlink;
3407
3408         /*
3409          * Because we drop the spinlock in the loop in order to put the tlink
3410          * it's not guarded against removal of links from the tree. The only
3411          * places that remove entries from the tree are this function and
3412          * umounts. Because this function is non-reentrant and is canceled
3413          * before umount can proceed, this is safe.
3414          */
3415         spin_lock(&cifs_sb->tlink_tree_lock);
3416         node = rb_first(root);
3417         while (node != NULL) {
3418                 tmp = node;
3419                 node = rb_next(tmp);
3420                 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3421
3422                 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3423                     atomic_read(&tlink->tl_count) != 0 ||
3424                     time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3425                         continue;
3426
3427                 cifs_get_tlink(tlink);
3428                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3429                 rb_erase(tmp, root);
3430
3431                 spin_unlock(&cifs_sb->tlink_tree_lock);
3432                 cifs_put_tlink(tlink);
3433                 spin_lock(&cifs_sb->tlink_tree_lock);
3434         }
3435         spin_unlock(&cifs_sb->tlink_tree_lock);
3436
3437         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3438                                 TLINK_IDLE_EXPIRE);
3439 }