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         char *prepath;
 109         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 110         struct nls_table *local_nls;
 111 };
 112
 113 /* FIXME: should these be tunable? */
 114 #define TLINK_ERROR_EXPIRE      (1 * HZ)
 115 #define TLINK_IDLE_EXPIRE       (600 * HZ)
 116
 117 static int ipv4_connect(struct TCP_Server_Info *server);
 118 static int ipv6_connect(struct TCP_Server_Info *server);
 119 static void cifs_prune_tlinks(struct work_struct *work);
 120
 121 /*
 122  * cifs tcp session reconnection
 123  *
 124  * mark tcp session as reconnecting so temporarily locked
 125  * mark all smb sessions as reconnecting for tcp session
 126  * reconnect tcp session
 127  * wake up waiters on reconnection? - (not needed currently)
 128  */
 129 static int
 130 cifs_reconnect(struct TCP_Server_Info *server)
 131 {
 132         int rc = 0;
 133         struct list_head *tmp, *tmp2;
 134         struct cifsSesInfo *ses;
 135         struct cifsTconInfo *tcon;
 136         struct mid_q_entry *mid_entry;
 137
 138         spin_lock(&GlobalMid_Lock);
 139         if (server->tcpStatus == CifsExiting) {
 140                 /* the demux thread will exit normally
 141                 next time through the loop */
 142                 spin_unlock(&GlobalMid_Lock);
 143                 return rc;
 144         } else
 145                 server->tcpStatus = CifsNeedReconnect;
 146         spin_unlock(&GlobalMid_Lock);
 147         server->maxBuf = 0;
 148
 149         cFYI(1, "Reconnecting tcp session");
 150
 151         /* before reconnecting the tcp session, mark the smb session (uid)
 152                 and the tid bad so they are not used until reconnected */
 153         spin_lock(&cifs_tcp_ses_lock);
 154         list_for_each(tmp, &server->smb_ses_list) {
 155                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 156                 ses->need_reconnect = true;
 157                 ses->ipc_tid = 0;
 158                 list_for_each(tmp2, &ses->tcon_list) {
 159                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 160                         tcon->need_reconnect = true;
 161                 }
 162         }
 163         spin_unlock(&cifs_tcp_ses_lock);
 164         /* do not want to be sending data on a socket we are freeing */
 165         mutex_lock(&server->srv_mutex);
 166         if (server->ssocket) {
 167                 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
 168                         server->ssocket->flags);
 169                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 170                 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
 171                         server->ssocket->state,
 172                         server->ssocket->flags);
 173                 sock_release(server->ssocket);
 174                 server->ssocket = NULL;
 175         }
 176         server->sequence_number = 0;
 177         server->session_estab = false;
 178         kfree(server->session_key.response);
 179         server->session_key.response = NULL;
 180         server->session_key.len = 0;
 181
 182         spin_lock(&GlobalMid_Lock);
 183         list_for_each(tmp, &server->pending_mid_q) {
 184                 mid_entry = list_entry(tmp, struct
 185                                         mid_q_entry,
 186                                         qhead);
 187                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 188                                 /* Mark other intransit requests as needing
 189                                    retry so we do not immediately mark the
 190                                    session bad again (ie after we reconnect
 191                                    below) as they timeout too */
 192                         mid_entry->midState = MID_RETRY_NEEDED;
 193                 }
 194         }
 195         spin_unlock(&GlobalMid_Lock);
 196         mutex_unlock(&server->srv_mutex);
 197
 198         while ((server->tcpStatus != CifsExiting) &&
 199                (server->tcpStatus != CifsGood)) {
 200                 try_to_freeze();
 201                 if (server->addr.sockAddr6.sin6_family == AF_INET6)
 202                         rc = ipv6_connect(server);
 203                 else
 204                         rc = ipv4_connect(server);
 205                 if (rc) {
 206                         cFYI(1, "reconnect error %d", rc);
 207                         msleep(3000);
 208                 } else {
 209                         atomic_inc(&tcpSesReconnectCount);
 210                         spin_lock(&GlobalMid_Lock);
 211                         if (server->tcpStatus != CifsExiting)
 212                                 server->tcpStatus = CifsGood;
 213                         spin_unlock(&GlobalMid_Lock);
 214         /*              atomic_set(&server->inFlight,0);*/
 215                         wake_up(&server->response_q);
 216                 }
 217         }
 218         return rc;
 219 }
 220
 221 /*
 222         return codes:
 223                 0       not a transact2, or all data present
 224                 >0      transact2 with that much data missing
 225                 -EINVAL = invalid transact2
 226
 227  */
 228 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 229 {
 230         struct smb_t2_rsp *pSMBt;
 231         int total_data_size;
 232         int data_in_this_rsp;
 233         int remaining;
 234
 235         if (pSMB->Command != SMB_COM_TRANSACTION2)
 236                 return 0;
 237
 238         /* check for plausible wct, bcc and t2 data and parm sizes */
 239         /* check for parm and data offset going beyond end of smb */
 240         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 241                 cFYI(1, "invalid transact2 word count");
 242                 return -EINVAL;
 243         }
 244
 245         pSMBt = (struct smb_t2_rsp *)pSMB;
 246
 247         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 248         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 249
 250         remaining = total_data_size - data_in_this_rsp;
 251
 252         if (remaining == 0)
 253                 return 0;
 254         else if (remaining < 0) {
 255                 cFYI(1, "total data %d smaller than data in frame %d",
 256                         total_data_size, data_in_this_rsp);
 257                 return -EINVAL;
 258         } else {
 259                 cFYI(1, "missing %d bytes from transact2, check next response",
 260                         remaining);
 261                 if (total_data_size > maxBufSize) {
 262                         cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 263                                 total_data_size, maxBufSize);
 264                         return -EINVAL;
 265                 }
 266                 return remaining;
 267         }
 268 }
 269
 270 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 271 {
 272         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 273         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 274         int total_data_size;
 275         int total_in_buf;
 276         int remaining;
 277         int total_in_buf2;
 278         char *data_area_of_target;
 279         char *data_area_of_buf2;
 280         __u16 byte_count;
 281
 282         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 283
 284         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 285                 cFYI(1, "total data size of primary and secondary t2 differ");
 286         }
 287
 288         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 289
 290         remaining = total_data_size - total_in_buf;
 291
 292         if (remaining < 0)
 293                 return -EINVAL;
 294
 295         if (remaining == 0) /* nothing to do, ignore */
 296                 return 0;
 297
 298         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 299         if (remaining < total_in_buf2) {
 300                 cFYI(1, "transact2 2nd response contains too much data");
 301         }
 302
 303         /* find end of first SMB data area */
 304         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 305                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 306         /* validate target area */
 307
 308         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 309                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 310
 311         data_area_of_target += total_in_buf;
 312
 313         /* copy second buffer into end of first buffer */
 314         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 315         total_in_buf += total_in_buf2;
 316         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 317         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 318         byte_count += total_in_buf2;
 319         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 320
 321         byte_count = pTargetSMB->smb_buf_length;
 322         byte_count += total_in_buf2;
 323
 324         /* BB also add check that we are not beyond maximum buffer size */
 325
 326         pTargetSMB->smb_buf_length = byte_count;
 327
 328         if (remaining == total_in_buf2) {
 329                 cFYI(1, "found the last secondary response");
 330                 return 0; /* we are done */
 331         } else /* more responses to go */
 332                 return 1;
 333
 334 }
 335
 336 static int
 337 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 338 {
 339         int length;
 340         unsigned int pdu_length, total_read;
 341         struct smb_hdr *smb_buffer = NULL;
 342         struct smb_hdr *bigbuf = NULL;
 343         struct smb_hdr *smallbuf = NULL;
 344         struct msghdr smb_msg;
 345         struct kvec iov;
 346         struct socket *csocket = server->ssocket;
 347         struct list_head *tmp;
 348         struct cifsSesInfo *ses;
 349         struct task_struct *task_to_wake = NULL;
 350         struct mid_q_entry *mid_entry;
 351         char temp;
 352         bool isLargeBuf = false;
 353         bool isMultiRsp;
 354         int reconnect;
 355
 356         current->flags |= PF_MEMALLOC;
 357         cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
 358
 359         length = atomic_inc_return(&tcpSesAllocCount);
 360         if (length > 1)
 361                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 362                                 GFP_KERNEL);
 363
 364         set_freezable();
 365         while (server->tcpStatus != CifsExiting) {
 366                 if (try_to_freeze())
 367                         continue;
 368                 if (bigbuf == NULL) {
 369                         bigbuf = cifs_buf_get();
 370                         if (!bigbuf) {
 371                                 cERROR(1, "No memory for large SMB response");
 372                                 msleep(3000);
 373                                 /* retry will check if exiting */
 374                                 continue;
 375                         }
 376                 } else if (isLargeBuf) {
 377                         /* we are reusing a dirty large buf, clear its start */
 378                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 379                 }
 380
 381                 if (smallbuf == NULL) {
 382                         smallbuf = cifs_small_buf_get();
 383                         if (!smallbuf) {
 384                                 cERROR(1, "No memory for SMB response");
 385                                 msleep(1000);
 386                                 /* retry will check if exiting */
 387                                 continue;
 388                         }
 389                         /* beginning of smb buffer is cleared in our buf_get */
 390                 } else /* if existing small buf clear beginning */
 391                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 392
 393                 isLargeBuf = false;
 394                 isMultiRsp = false;
 395                 smb_buffer = smallbuf;
 396                 iov.iov_base = smb_buffer;
 397                 iov.iov_len = 4;
 398                 smb_msg.msg_control = NULL;
 399                 smb_msg.msg_controllen = 0;
 400                 pdu_length = 4; /* enough to get RFC1001 header */
 401 incomplete_rcv:
 402                 length =
 403                     kernel_recvmsg(csocket, &smb_msg,
 404                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 405
 406                 if (server->tcpStatus == CifsExiting) {
 407                         break;
 408                 } else if (server->tcpStatus == CifsNeedReconnect) {
 409                         cFYI(1, "Reconnect after server stopped responding");
 410                         cifs_reconnect(server);
 411                         cFYI(1, "call to reconnect done");
 412                         csocket = server->ssocket;
 413                         continue;
 414                 } else if (length == -ERESTARTSYS ||
 415                            length == -EAGAIN ||
 416                            length == -EINTR) {
 417                         msleep(1); /* minimum sleep to prevent looping
 418                                 allowing socket to clear and app threads to set
 419                                 tcpStatus CifsNeedReconnect if server hung */
 420                         if (pdu_length < 4) {
 421                                 iov.iov_base = (4 - pdu_length) +
 422                                                         (char *)smb_buffer;
 423                                 iov.iov_len = pdu_length;
 424                                 smb_msg.msg_control = NULL;
 425                                 smb_msg.msg_controllen = 0;
 426                                 goto incomplete_rcv;
 427                         } else
 428                                 continue;
 429                 } else if (length <= 0) {
 430                         cFYI(1, "Reconnect after unexpected peek error %d",
 431                                 length);
 432                         cifs_reconnect(server);
 433                         csocket = server->ssocket;
 434                         wake_up(&server->response_q);
 435                         continue;
 436                 } else if (length < pdu_length) {
 437                         cFYI(1, "requested %d bytes but only got %d bytes",
 438                                   pdu_length, length);
 439                         pdu_length -= length;
 440                         msleep(1);
 441                         goto incomplete_rcv;
 442                 }
 443
 444                 /* The right amount was read from socket - 4 bytes */
 445                 /* so we can now interpret the length field */
 446
 447                 /* the first byte big endian of the length field,
 448                 is actually not part of the length but the type
 449                 with the most common, zero, as regular data */
 450                 temp = *((char *) smb_buffer);
 451
 452                 /* Note that FC 1001 length is big endian on the wire,
 453                 but we convert it here so it is always manipulated
 454                 as host byte order */
 455                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 456                 smb_buffer->smb_buf_length = pdu_length;
 457
 458                 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
 459
 460                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 461                         continue;
 462                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 463                         cFYI(1, "Good RFC 1002 session rsp");
 464                         continue;
 465                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 466                         /* we get this from Windows 98 instead of
 467                            an error on SMB negprot response */
 468                         cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
 469                                 pdu_length);
 470                         /* give server a second to clean up  */
 471                         msleep(1000);
 472                         /* always try 445 first on reconnect since we get NACK
 473                          * on some if we ever connected to port 139 (the NACK
 474                          * is since we do not begin with RFC1001 session
 475                          * initialize frame)
 476                          */
 477                         cifs_set_port((struct sockaddr *)
 478                                         &server->addr.sockAddr, CIFS_PORT);
 479                         cifs_reconnect(server);
 480                         csocket = server->ssocket;
 481                         wake_up(&server->response_q);
 482                         continue;
 483                 } else if (temp != (char) 0) {
 484                         cERROR(1, "Unknown RFC 1002 frame");
 485                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 486                                       length);
 487                         cifs_reconnect(server);
 488                         csocket = server->ssocket;
 489                         continue;
 490                 }
 491
 492                 /* else we have an SMB response */
 493                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 494                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 495                         cERROR(1, "Invalid size SMB length %d pdu_length %d",
 496                                         length, pdu_length+4);
 497                         cifs_reconnect(server);
 498                         csocket = server->ssocket;
 499                         wake_up(&server->response_q);
 500                         continue;
 501                 }
 502
 503                 /* else length ok */
 504                 reconnect = 0;
 505
 506                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 507                         isLargeBuf = true;
 508                         memcpy(bigbuf, smallbuf, 4);
 509                         smb_buffer = bigbuf;
 510                 }
 511                 length = 0;
 512                 iov.iov_base = 4 + (char *)smb_buffer;
 513                 iov.iov_len = pdu_length;
 514                 for (total_read = 0; total_read < pdu_length;
 515                      total_read += length) {
 516                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 517                                                 pdu_length - total_read, 0);
 518                         if (server->tcpStatus == CifsExiting) {
 519                                 /* then will exit */
 520                                 reconnect = 2;
 521                                 break;
 522                         } else if (server->tcpStatus == CifsNeedReconnect) {
 523                                 cifs_reconnect(server);
 524                                 csocket = server->ssocket;
 525                                 /* Reconnect wakes up rspns q */
 526                                 /* Now we will reread sock */
 527                                 reconnect = 1;
 528                                 break;
 529                         } else if (length == -ERESTARTSYS ||
 530                                    length == -EAGAIN ||
 531                                    length == -EINTR) {
 532                                 msleep(1); /* minimum sleep to prevent looping,
 533                                               allowing socket to clear and app
 534                                               threads to set tcpStatus
 535                                               CifsNeedReconnect if server hung*/
 536                                 length = 0;
 537                                 continue;
 538                         } else if (length <= 0) {
 539                                 cERROR(1, "Received no data, expecting %d",
 540                                               pdu_length - total_read);
 541                                 cifs_reconnect(server);
 542                                 csocket = server->ssocket;
 543                                 reconnect = 1;
 544                                 break;
 545                         }
 546                 }
 547                 if (reconnect == 2)
 548                         break;
 549                 else if (reconnect == 1)
 550                         continue;
 551
 552                 length += 4; /* account for rfc1002 hdr */
 553
 554
 555                 dump_smb(smb_buffer, length);
 556                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 557                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 558                         continue;
 559                 }
 560
 561
 562                 task_to_wake = NULL;
 563                 spin_lock(&GlobalMid_Lock);
 564                 list_for_each(tmp, &server->pending_mid_q) {
 565                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 566
 567                         if ((mid_entry->mid == smb_buffer->Mid) &&
 568                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 569                             (mid_entry->command == smb_buffer->Command)) {
 570                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 571                                         /* We have a multipart transact2 resp */
 572                                         isMultiRsp = true;
 573                                         if (mid_entry->resp_buf) {
 574                                                 /* merge response - fix up 1st*/
 575                                                 if (coalesce_t2(smb_buffer,
 576                                                         mid_entry->resp_buf)) {
 577                                                         mid_entry->multiRsp =
 578                                                                  true;
 579                                                         break;
 580                                                 } else {
 581                                                         /* all parts received */
 582                                                         mid_entry->multiEnd =
 583                                                                  true;
 584                                                         goto multi_t2_fnd;
 585                                                 }
 586                                         } else {
 587                                                 if (!isLargeBuf) {
 588                                                         cERROR(1, "1st trans2 resp needs bigbuf");
 589                                         /* BB maybe we can fix this up,  switch
 590                                            to already allocated large buffer? */
 591                                                 } else {
 592                                                         /* Have first buffer */
 593                                                         mid_entry->resp_buf =
 594                                                                  smb_buffer;
 595                                                         mid_entry->largeBuf =
 596                                                                  true;
 597                                                         bigbuf = NULL;
 598                                                 }
 599                                         }
 600                                         break;
 601                                 }
 602                                 mid_entry->resp_buf = smb_buffer;
 603                                 mid_entry->largeBuf = isLargeBuf;
 604 multi_t2_fnd:
 605                                 task_to_wake = mid_entry->tsk;
 606                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 607 #ifdef CONFIG_CIFS_STATS2
 608                                 mid_entry->when_received = jiffies;
 609 #endif
 610                                 /* so we do not time out requests to  server
 611                                 which is still responding (since server could
 612                                 be busy but not dead) */
 613                                 server->lstrp = jiffies;
 614                                 break;
 615                         }
 616                 }
 617                 spin_unlock(&GlobalMid_Lock);
 618                 if (task_to_wake) {
 619                         /* Was previous buf put in mpx struct for multi-rsp? */
 620                         if (!isMultiRsp) {
 621                                 /* smb buffer will be freed by user thread */
 622                                 if (isLargeBuf)
 623                                         bigbuf = NULL;
 624                                 else
 625                                         smallbuf = NULL;
 626                         }
 627                         wake_up_process(task_to_wake);
 628                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 629                            !isMultiRsp) {
 630                         cERROR(1, "No task to wake, unknown frame received! "
 631                                    "NumMids %d", midCount.counter);
 632                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 633                                       sizeof(struct smb_hdr));
 634 #ifdef CONFIG_CIFS_DEBUG2
 635                         cifs_dump_detail(smb_buffer);
 636                         cifs_dump_mids(server);
 637 #endif /* CIFS_DEBUG2 */
 638
 639                 }
 640         } /* end while !EXITING */
 641
 642         /* take it off the list, if it's not already */
 643         spin_lock(&cifs_tcp_ses_lock);
 644         list_del_init(&server->tcp_ses_list);
 645         spin_unlock(&cifs_tcp_ses_lock);
 646
 647         spin_lock(&GlobalMid_Lock);
 648         server->tcpStatus = CifsExiting;
 649         spin_unlock(&GlobalMid_Lock);
 650         wake_up_all(&server->response_q);
 651
 652         /* check if we have blocked requests that need to free */
 653         /* Note that cifs_max_pending is normally 50, but
 654         can be set at module install time to as little as two */
 655         spin_lock(&GlobalMid_Lock);
 656         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 657                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 658         /* We do not want to set the max_pending too low or we
 659         could end up with the counter going negative */
 660         spin_unlock(&GlobalMid_Lock);
 661         /* Although there should not be any requests blocked on
 662         this queue it can not hurt to be paranoid and try to wake up requests
 663         that may haven been blocked when more than 50 at time were on the wire
 664         to the same server - they now will see the session is in exit state
 665         and get out of SendReceive.  */
 666         wake_up_all(&server->request_q);
 667         /* give those requests time to exit */
 668         msleep(125);
 669
 670         if (server->ssocket) {
 671                 sock_release(csocket);
 672                 server->ssocket = NULL;
 673         }
 674         /* buffer usuallly freed in free_mid - need to free it here on exit */
 675         cifs_buf_release(bigbuf);
 676         if (smallbuf) /* no sense logging a debug message if NULL */
 677                 cifs_small_buf_release(smallbuf);
 678
 679         /*
 680          * BB: we shouldn't have to do any of this. It shouldn't be
 681          * possible to exit from the thread with active SMB sessions
 682          */
 683         spin_lock(&cifs_tcp_ses_lock);
 684         if (list_empty(&server->pending_mid_q)) {
 685                 /* loop through server session structures attached to this and
 686                     mark them dead */
 687                 list_for_each(tmp, &server->smb_ses_list) {
 688                         ses = list_entry(tmp, struct cifsSesInfo,
 689                                          smb_ses_list);
 690                         ses->status = CifsExiting;
 691                         ses->server = NULL;
 692                 }
 693                 spin_unlock(&cifs_tcp_ses_lock);
 694         } else {
 695                 /* although we can not zero the server struct pointer yet,
 696                 since there are active requests which may depnd on them,
 697                 mark the corresponding SMB sessions as exiting too */
 698                 list_for_each(tmp, &server->smb_ses_list) {
 699                         ses = list_entry(tmp, struct cifsSesInfo,
 700                                          smb_ses_list);
 701                         ses->status = CifsExiting;
 702                 }
 703
 704                 spin_lock(&GlobalMid_Lock);
 705                 list_for_each(tmp, &server->pending_mid_q) {
 706                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 707                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 708                                 cFYI(1, "Clearing Mid 0x%x - waking up ",
 709                                          mid_entry->mid);
 710                                 task_to_wake = mid_entry->tsk;
 711                                 if (task_to_wake)
 712                                         wake_up_process(task_to_wake);
 713                         }
 714                 }
 715                 spin_unlock(&GlobalMid_Lock);
 716                 spin_unlock(&cifs_tcp_ses_lock);
 717                 /* 1/8th of sec is more than enough time for them to exit */
 718                 msleep(125);
 719         }
 720
 721         if (!list_empty(&server->pending_mid_q)) {
 722                 /* mpx threads have not exited yet give them
 723                 at least the smb send timeout time for long ops */
 724                 /* due to delays on oplock break requests, we need
 725                 to wait at least 45 seconds before giving up
 726                 on a request getting a response and going ahead
 727                 and killing cifsd */
 728                 cFYI(1, "Wait for exit from demultiplex thread");
 729                 msleep(46000);
 730                 /* if threads still have not exited they are probably never
 731                 coming home not much else we can do but free the memory */
 732         }
 733
 734         /* last chance to mark ses pointers invalid
 735         if there are any pointing to this (e.g
 736         if a crazy root user tried to kill cifsd
 737         kernel thread explicitly this might happen) */
 738         /* BB: This shouldn't be necessary, see above */
 739         spin_lock(&cifs_tcp_ses_lock);
 740         list_for_each(tmp, &server->smb_ses_list) {
 741                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 742                 ses->server = NULL;
 743         }
 744         spin_unlock(&cifs_tcp_ses_lock);
 745
 746         kfree(server->hostname);
 747         task_to_wake = xchg(&server->tsk, NULL);
 748         kfree(server);
 749
 750         length = atomic_dec_return(&tcpSesAllocCount);
 751         if (length  > 0)
 752                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 753                                 GFP_KERNEL);
 754
 755         /* if server->tsk was NULL then wait for a signal before exiting */
 756         if (!task_to_wake) {
 757                 set_current_state(TASK_INTERRUPTIBLE);
 758                 while (!signal_pending(current)) {
 759                         schedule();
 760                         set_current_state(TASK_INTERRUPTIBLE);
 761                 }
 762                 set_current_state(TASK_RUNNING);
 763         }
 764
 765         module_put_and_exit(0);
 766 }
 767
 768 /* extract the host portion of the UNC string */
 769 static char *
 770 extract_hostname(const char *unc)
 771 {
 772         const char *src;
 773         char *dst, *delim;
 774         unsigned int len;
 775
 776         /* skip double chars at beginning of string */
 777         /* BB: check validity of these bytes? */
 778         src = unc + 2;
 779
 780         /* delimiter between hostname and sharename is always '\\' now */
 781         delim = strchr(src, '\\');
 782         if (!delim)
 783                 return ERR_PTR(-EINVAL);
 784
 785         len = delim - src;
 786         dst = kmalloc((len + 1), GFP_KERNEL);
 787         if (dst == NULL)
 788                 return ERR_PTR(-ENOMEM);
 789
 790         memcpy(dst, src, len);
 791         dst[len] = '\0';
 792
 793         return dst;
 794 }
 795
 796 static int
 797 cifs_parse_mount_options(char *options, const char *devname,
 798                          struct smb_vol *vol)
 799 {
 800         char *value;
 801         char *data;
 802         unsigned int  temp_len, i, j;
 803         char separator[2];
 804         short int override_uid = -1;
 805         short int override_gid = -1;
 806         bool uid_specified = false;
 807         bool gid_specified = false;
 808
 809         separator[0] = ',';
 810         separator[1] = 0;
 811
 812         if (Local_System_Name[0] != 0)
 813                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 814         else {
 815                 char *nodename = utsname()->nodename;
 816                 int n = strnlen(nodename, 15);
 817                 memset(vol->source_rfc1001_name, 0x20, 15);
 818                 for (i = 0; i < n; i++) {
 819                         /* does not have to be perfect mapping since field is
 820                         informational, only used for servers that do not support
 821                         port 445 and it can be overridden at mount time */
 822                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 823                 }
 824         }
 825         vol->source_rfc1001_name[15] = 0;
 826         /* null target name indicates to use *SMBSERVR default called name
 827            if we end up sending RFC1001 session initialize */
 828         vol->target_rfc1001_name[0] = 0;
 829         vol->cred_uid = current_uid();
 830         vol->linux_uid = current_uid();
 831         vol->linux_gid = current_gid();
 832
 833         /* default to only allowing write access to owner of the mount */
 834         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 835
 836         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 837         /* default is always to request posix paths. */
 838         vol->posix_paths = 1;
 839         /* default to using server inode numbers where available */
 840         vol->server_ino = 1;
 841
 842         if (!options)
 843                 return 1;
 844
 845         if (strncmp(options, "sep=", 4) == 0) {
 846                 if (options[4] != 0) {
 847                         separator[0] = options[4];
 848                         options += 5;
 849                 } else {
 850                         cFYI(1, "Null separator not allowed");
 851                 }
 852         }
 853
 854         while ((data = strsep(&options, separator)) != NULL) {
 855                 if (!*data)
 856                         continue;
 857                 if ((value = strchr(data, '=')) != NULL)
 858                         *value++ = '\0';
 859
 860                 /* Have to parse this before we parse for "user" */
 861                 if (strnicmp(data, "user_xattr", 10) == 0) {
 862                         vol->no_xattr = 0;
 863                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 864                         vol->no_xattr = 1;
 865                 } else if (strnicmp(data, "user", 4) == 0) {
 866                         if (!value) {
 867                                 printk(KERN_WARNING
 868                                        "CIFS: invalid or missing username\n");
 869                                 return 1;       /* needs_arg; */
 870                         } else if (!*value) {
 871                                 /* null user, ie anonymous, authentication */
 872                                 vol->nullauth = 1;
 873                         }
 874                         if (strnlen(value, 200) < 200) {
 875                                 vol->username = value;
 876                         } else {
 877                                 printk(KERN_WARNING "CIFS: username too long\n");
 878                                 return 1;
 879                         }
 880                 } else if (strnicmp(data, "pass", 4) == 0) {
 881                         if (!value) {
 882                                 vol->password = NULL;
 883                                 continue;
 884                         } else if (value[0] == 0) {
 885                                 /* check if string begins with double comma
 886                                    since that would mean the password really
 887                                    does start with a comma, and would not
 888                                    indicate an empty string */
 889                                 if (value[1] != separator[0]) {
 890                                         vol->password = NULL;
 891                                         continue;
 892                                 }
 893                         }
 894                         temp_len = strlen(value);
 895                         /* removed password length check, NTLM passwords
 896                                 can be arbitrarily long */
 897
 898                         /* if comma in password, the string will be
 899                         prematurely null terminated.  Commas in password are
 900                         specified across the cifs mount interface by a double
 901                         comma ie ,, and a comma used as in other cases ie ','
 902                         as a parameter delimiter/separator is single and due
 903                         to the strsep above is temporarily zeroed. */
 904
 905                         /* NB: password legally can have multiple commas and
 906                         the only illegal character in a password is null */
 907
 908                         if ((value[temp_len] == 0) &&
 909                             (value[temp_len+1] == separator[0])) {
 910                                 /* reinsert comma */
 911                                 value[temp_len] = separator[0];
 912                                 temp_len += 2;  /* move after second comma */
 913                                 while (value[temp_len] != 0)  {
 914                                         if (value[temp_len] == separator[0]) {
 915                                                 if (value[temp_len+1] ==
 916                                                      separator[0]) {
 917                                                 /* skip second comma */
 918                                                         temp_len++;
 919                                                 } else {
 920                                                 /* single comma indicating start
 921                                                          of next parm */
 922                                                         break;
 923                                                 }
 924                                         }
 925                                         temp_len++;
 926                                 }
 927                                 if (value[temp_len] == 0) {
 928                                         options = NULL;
 929                                 } else {
 930                                         value[temp_len] = 0;
 931                                         /* point option to start of next parm */
 932                                         options = value + temp_len + 1;
 933                                 }
 934                                 /* go from value to value + temp_len condensing
 935                                 double commas to singles. Note that this ends up
 936                                 allocating a few bytes too many, which is ok */
 937                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 938                                 if (vol->password == NULL) {
 939                                         printk(KERN_WARNING "CIFS: no memory "
 940                                                             "for password\n");
 941                                         return 1;
 942                                 }
 943                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 944                                         vol->password[j] = value[i];
 945                                         if (value[i] == separator[0]
 946                                                 && value[i+1] == separator[0]) {
 947                                                 /* skip second comma */
 948                                                 i++;
 949                                         }
 950                                 }
 951                                 vol->password[j] = 0;
 952                         } else {
 953                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 954                                 if (vol->password == NULL) {
 955                                         printk(KERN_WARNING "CIFS: no memory "
 956                                                             "for password\n");
 957                                         return 1;
 958                                 }
 959                                 strcpy(vol->password, value);
 960                         }
 961                 } else if (!strnicmp(data, "ip", 2) ||
 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, "credentials", 4) == 0) {
1217                         /* ignore */
1218                 } else if (strnicmp(data, "version", 3) == 0) {
1219                         /* ignore */
1220                 } else if (strnicmp(data, "guest", 5) == 0) {
1221                         /* ignore */
1222                 } else if (strnicmp(data, "rw", 2) == 0) {
1223                         /* ignore */
1224                 } else if (strnicmp(data, "ro", 2) == 0) {
1225                         /* ignore */
1226                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1227                         vol->noblocksnd = 1;
1228                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1229                         vol->noautotune = 1;
1230                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1231                                    (strnicmp(data, "nosuid", 6) == 0) ||
1232                                    (strnicmp(data, "exec", 4) == 0) ||
1233                                    (strnicmp(data, "noexec", 6) == 0) ||
1234                                    (strnicmp(data, "nodev", 5) == 0) ||
1235                                    (strnicmp(data, "noauto", 6) == 0) ||
1236                                    (strnicmp(data, "dev", 3) == 0)) {
1237                         /*  The mount tool or mount.cifs helper (if present)
1238                             uses these opts to set flags, and the flags are read
1239                             by the kernel vfs layer before we get here (ie
1240                             before read super) so there is no point trying to
1241                             parse these options again and set anything and it
1242                             is ok to just ignore them */
1243                         continue;
1244                 } else if (strnicmp(data, "hard", 4) == 0) {
1245                         vol->retry = 1;
1246                 } else if (strnicmp(data, "soft", 4) == 0) {
1247                         vol->retry = 0;
1248                 } else if (strnicmp(data, "perm", 4) == 0) {
1249                         vol->noperm = 0;
1250                 } else if (strnicmp(data, "noperm", 6) == 0) {
1251                         vol->noperm = 1;
1252                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1253                         vol->remap = 1;
1254                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1255                         vol->remap = 0;
1256                 } else if (strnicmp(data, "sfu", 3) == 0) {
1257                         vol->sfu_emul = 1;
1258                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1259                         vol->sfu_emul = 0;
1260                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1261                         vol->nodfs = 1;
1262                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1263                         vol->posix_paths = 1;
1264                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1265                         vol->posix_paths = 0;
1266                 } else if (strnicmp(data, "nounix", 6) == 0) {
1267                         vol->no_linux_ext = 1;
1268                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1269                         vol->no_linux_ext = 1;
1270                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1271                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1272                         vol->nocase = 1;
1273                 } else if (strnicmp(data, "mand", 4) == 0) {
1274                         /* ignore */
1275                 } else if (strnicmp(data, "nomand", 6) == 0) {
1276                         /* ignore */
1277                 } else if (strnicmp(data, "_netdev", 7) == 0) {
1278                         /* ignore */
1279                 } else if (strnicmp(data, "brl", 3) == 0) {
1280                         vol->nobrl =  0;
1281                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1282                            (strnicmp(data, "nolock", 6) == 0)) {
1283                         vol->nobrl =  1;
1284                         /* turn off mandatory locking in mode
1285                         if remote locking is turned off since the
1286                         local vfs will do advisory */
1287                         if (vol->file_mode ==
1288                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1289                                 vol->file_mode = S_IALLUGO;
1290                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1291                         /* will take the shorter form "forcemand" as well */
1292                         /* This mount option will force use of mandatory
1293                           (DOS/Windows style) byte range locks, instead of
1294                           using posix advisory byte range locks, even if the
1295                           Unix extensions are available and posix locks would
1296                           be supported otherwise. If Unix extensions are not
1297                           negotiated this has no effect since mandatory locks
1298                           would be used (mandatory locks is all that those
1299                           those servers support) */
1300                         vol->mand_lock = 1;
1301                 } else if (strnicmp(data, "setuids", 7) == 0) {
1302                         vol->setuids = 1;
1303                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1304                         vol->setuids = 0;
1305                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1306                         vol->dynperm = true;
1307                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1308                         vol->dynperm = false;
1309                 } else if (strnicmp(data, "nohard", 6) == 0) {
1310                         vol->retry = 0;
1311                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1312                         vol->retry = 1;
1313                 } else if (strnicmp(data, "nointr", 6) == 0) {
1314                         vol->intr = 0;
1315                 } else if (strnicmp(data, "intr", 4) == 0) {
1316                         vol->intr = 1;
1317                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1318                         vol->nostrictsync = 1;
1319                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1320                         vol->nostrictsync = 0;
1321                 } else if (strnicmp(data, "serverino", 7) == 0) {
1322                         vol->server_ino = 1;
1323                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1324                         vol->server_ino = 0;
1325                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1326                         vol->cifs_acl = 1;
1327                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1328                         vol->cifs_acl = 0;
1329                 } else if (strnicmp(data, "acl", 3) == 0) {
1330                         vol->no_psx_acl = 0;
1331                 } else if (strnicmp(data, "noacl", 5) == 0) {
1332                         vol->no_psx_acl = 1;
1333 #ifdef CONFIG_CIFS_EXPERIMENTAL
1334                 } else if (strnicmp(data, "locallease", 6) == 0) {
1335                         vol->local_lease = 1;
1336 #endif
1337                 } else if (strnicmp(data, "sign", 4) == 0) {
1338                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1339                 } else if (strnicmp(data, "seal", 4) == 0) {
1340                         /* we do not do the following in secFlags because seal
1341                            is a per tree connection (mount) not a per socket
1342                            or per-smb connection option in the protocol */
1343                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1344                         vol->seal = 1;
1345                 } else if (strnicmp(data, "direct", 6) == 0) {
1346                         vol->direct_io = 1;
1347                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1348                         vol->direct_io = 1;
1349                 } else if (strnicmp(data, "noac", 4) == 0) {
1350                         printk(KERN_WARNING "CIFS: Mount option noac not "
1351                                 "supported. Instead set "
1352                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1353                 } else if (strnicmp(data, "fsc", 3) == 0) {
1354                         vol->fsc = true;
1355                 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1356                         vol->mfsymlinks = true;
1357                 } else if (strnicmp(data, "multiuser", 8) == 0) {
1358                         vol->multiuser = true;
1359                 } else
1360                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1361                                                 data);
1362         }
1363         if (vol->UNC == NULL) {
1364                 if (devname == NULL) {
1365                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1366                                                 "target\n");
1367                         return 1;
1368                 }
1369                 if ((temp_len = strnlen(devname, 300)) < 300) {
1370                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1371                         if (vol->UNC == NULL)
1372                                 return 1;
1373                         strcpy(vol->UNC, devname);
1374                         if (strncmp(vol->UNC, "//", 2) == 0) {
1375                                 vol->UNC[0] = '\\';
1376                                 vol->UNC[1] = '\\';
1377                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1378                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1379                                                     "begin with // or \\\\ \n");
1380                                 return 1;
1381                         }
1382                         value = strpbrk(vol->UNC+2, "/\\");
1383                         if (value)
1384                                 *value = '\\';
1385                 } else {
1386                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1387                         return 1;
1388                 }
1389         }
1390
1391         if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1392                 cERROR(1, "Multiuser mounts currently require krb5 "
1393                           "authentication!");
1394                 return 1;
1395         }
1396
1397         if (vol->UNCip == NULL)
1398                 vol->UNCip = &vol->UNC[2];
1399
1400         if (uid_specified)
1401                 vol->override_uid = override_uid;
1402         else if (override_uid == 1)
1403                 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1404                                    "specified with no uid= option.\n");
1405
1406         if (gid_specified)
1407                 vol->override_gid = override_gid;
1408         else if (override_gid == 1)
1409                 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1410                                    "specified with no gid= option.\n");
1411
1412         return 0;
1413 }
1414
1415 /** Returns true if srcaddr isn't specified and rhs isn't
1416  * specified, or if srcaddr is specified and
1417  * matches the IP address of the rhs argument.
1418  */
1419 static bool
1420 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1421 {
1422         switch (srcaddr->sa_family) {
1423         case AF_UNSPEC:
1424                 return (rhs->sa_family == AF_UNSPEC);
1425         case AF_INET: {
1426                 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1427                 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1428                 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1429         }
1430         case AF_INET6: {
1431                 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1432                 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1433                 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1434         }
1435         default:
1436                 WARN_ON(1);
1437                 return false; /* don't expect to be here */
1438         }
1439 }
1440
1441
1442 static bool
1443 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1444               struct sockaddr *srcaddr)
1445 {
1446         struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1447         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1448
1449         switch (addr->sa_family) {
1450         case AF_INET:
1451                 if (addr4->sin_addr.s_addr !=
1452                     server->addr.sockAddr.sin_addr.s_addr)
1453                         return false;
1454                 if (addr4->sin_port &&
1455                     addr4->sin_port != server->addr.sockAddr.sin_port)
1456                         return false;
1457                 break;
1458         case AF_INET6:
1459                 if (!ipv6_addr_equal(&addr6->sin6_addr,
1460                                      &server->addr.sockAddr6.sin6_addr))
1461                         return false;
1462                 if (addr6->sin6_scope_id !=
1463                     server->addr.sockAddr6.sin6_scope_id)
1464                         return false;
1465                 if (addr6->sin6_port &&
1466                     addr6->sin6_port != server->addr.sockAddr6.sin6_port)
1467                         return false;
1468                 break;
1469         }
1470
1471         if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1472                 return false;
1473
1474         return true;
1475 }
1476
1477 static bool
1478 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1479 {
1480         unsigned int secFlags;
1481
1482         if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1483                 secFlags = vol->secFlg;
1484         else
1485                 secFlags = global_secflags | vol->secFlg;
1486
1487         switch (server->secType) {
1488         case LANMAN:
1489                 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1490                         return false;
1491                 break;
1492         case NTLMv2:
1493                 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1494                         return false;
1495                 break;
1496         case NTLM:
1497                 if (!(secFlags & CIFSSEC_MAY_NTLM))
1498                         return false;
1499                 break;
1500         case Kerberos:
1501                 if (!(secFlags & CIFSSEC_MAY_KRB5))
1502                         return false;
1503                 break;
1504         case RawNTLMSSP:
1505                 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1506                         return false;
1507                 break;
1508         default:
1509                 /* shouldn't happen */
1510                 return false;
1511         }
1512
1513         /* now check if signing mode is acceptible */
1514         if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1515             (server->secMode & SECMODE_SIGN_REQUIRED))
1516                         return false;
1517         else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1518                  (server->secMode &
1519                   (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1520                         return false;
1521
1522         return true;
1523 }
1524
1525 static struct TCP_Server_Info *
1526 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1527 {
1528         struct TCP_Server_Info *server;
1529
1530         spin_lock(&cifs_tcp_ses_lock);
1531         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1532                 if (!match_address(server, addr,
1533                                    (struct sockaddr *)&vol->srcaddr))
1534                         continue;
1535
1536                 if (!match_security(server, vol))
1537                         continue;
1538
1539                 ++server->srv_count;
1540                 spin_unlock(&cifs_tcp_ses_lock);
1541                 cFYI(1, "Existing tcp session with server found");
1542                 return server;
1543         }
1544         spin_unlock(&cifs_tcp_ses_lock);
1545         return NULL;
1546 }
1547
1548 static void
1549 cifs_put_tcp_session(struct TCP_Server_Info *server)
1550 {
1551         struct task_struct *task;
1552
1553         spin_lock(&cifs_tcp_ses_lock);
1554         if (--server->srv_count > 0) {
1555                 spin_unlock(&cifs_tcp_ses_lock);
1556                 return;
1557         }
1558
1559         list_del_init(&server->tcp_ses_list);
1560         spin_unlock(&cifs_tcp_ses_lock);
1561
1562         spin_lock(&GlobalMid_Lock);
1563         server->tcpStatus = CifsExiting;
1564         spin_unlock(&GlobalMid_Lock);
1565
1566         cifs_fscache_release_client_cookie(server);
1567
1568         kfree(server->session_key.response);
1569         server->session_key.response = NULL;
1570         server->session_key.len = 0;
1571
1572         task = xchg(&server->tsk, NULL);
1573         if (task)
1574                 force_sig(SIGKILL, task);
1575 }
1576
1577 static struct TCP_Server_Info *
1578 cifs_get_tcp_session(struct smb_vol *volume_info)
1579 {
1580         struct TCP_Server_Info *tcp_ses = NULL;
1581         struct sockaddr_storage addr;
1582         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1583         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1584         int rc;
1585
1586         memset(&addr, 0, sizeof(struct sockaddr_storage));
1587
1588         cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1589
1590         if (volume_info->UNCip && volume_info->UNC) {
1591                 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1592                                         volume_info->UNCip,
1593                                         strlen(volume_info->UNCip),
1594                                         volume_info->port);
1595                 if (!rc) {
1596                         /* we failed translating address */
1597                         rc = -EINVAL;
1598                         goto out_err;
1599                 }
1600         } else if (volume_info->UNCip) {
1601                 /* BB using ip addr as tcp_ses name to connect to the
1602                    DFS root below */
1603                 cERROR(1, "Connecting to DFS root not implemented yet");
1604                 rc = -EINVAL;
1605                 goto out_err;
1606         } else /* which tcp_sess DFS root would we conect to */ {
1607                 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1608                         "unc=//192.168.1.100/public) specified");
1609                 rc = -EINVAL;
1610                 goto out_err;
1611         }
1612
1613         /* see if we already have a matching tcp_ses */
1614         tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1615         if (tcp_ses)
1616                 return tcp_ses;
1617
1618         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1619         if (!tcp_ses) {
1620                 rc = -ENOMEM;
1621                 goto out_err;
1622         }
1623
1624         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1625         if (IS_ERR(tcp_ses->hostname)) {
1626                 rc = PTR_ERR(tcp_ses->hostname);
1627                 goto out_err;
1628         }
1629
1630         tcp_ses->noblocksnd = volume_info->noblocksnd;
1631         tcp_ses->noautotune = volume_info->noautotune;
1632         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1633         atomic_set(&tcp_ses->inFlight, 0);
1634         init_waitqueue_head(&tcp_ses->response_q);
1635         init_waitqueue_head(&tcp_ses->request_q);
1636         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1637         mutex_init(&tcp_ses->srv_mutex);
1638         memcpy(tcp_ses->workstation_RFC1001_name,
1639                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1640         memcpy(tcp_ses->server_RFC1001_name,
1641                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1642         tcp_ses->session_estab = false;
1643         tcp_ses->sequence_number = 0;
1644         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1645         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1646
1647         /*
1648          * at this point we are the only ones with the pointer
1649          * to the struct since the kernel thread not created yet
1650          * no need to spinlock this init of tcpStatus or srv_count
1651          */
1652         tcp_ses->tcpStatus = CifsNew;
1653         memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1654                sizeof(tcp_ses->srcaddr));
1655         ++tcp_ses->srv_count;
1656
1657         if (addr.ss_family == AF_INET6) {
1658                 cFYI(1, "attempting ipv6 connect");
1659                 /* BB should we allow ipv6 on port 139? */
1660                 /* other OS never observed in Wild doing 139 with v6 */
1661                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1662                         sizeof(struct sockaddr_in6));
1663                 rc = ipv6_connect(tcp_ses);
1664         } else {
1665                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1666                         sizeof(struct sockaddr_in));
1667                 rc = ipv4_connect(tcp_ses);
1668         }
1669         if (rc < 0) {
1670                 cERROR(1, "Error connecting to socket. Aborting operation");
1671                 goto out_err;
1672         }
1673
1674         /*
1675          * since we're in a cifs function already, we know that
1676          * this will succeed. No need for try_module_get().
1677          */
1678         __module_get(THIS_MODULE);
1679         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1680                                   tcp_ses, "cifsd");
1681         if (IS_ERR(tcp_ses->tsk)) {
1682                 rc = PTR_ERR(tcp_ses->tsk);
1683                 cERROR(1, "error %d create cifsd thread", rc);
1684                 module_put(THIS_MODULE);
1685                 goto out_err;
1686         }
1687
1688         /* thread spawned, put it on the list */
1689         spin_lock(&cifs_tcp_ses_lock);
1690         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1691         spin_unlock(&cifs_tcp_ses_lock);
1692
1693         cifs_fscache_get_client_cookie(tcp_ses);
1694
1695         return tcp_ses;
1696
1697 out_err:
1698         if (tcp_ses) {
1699                 if (!IS_ERR(tcp_ses->hostname))
1700                         kfree(tcp_ses->hostname);
1701                 if (tcp_ses->ssocket)
1702                         sock_release(tcp_ses->ssocket);
1703                 kfree(tcp_ses);
1704         }
1705         return ERR_PTR(rc);
1706 }
1707
1708 static struct cifsSesInfo *
1709 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1710 {
1711         struct cifsSesInfo *ses;
1712
1713         spin_lock(&cifs_tcp_ses_lock);
1714         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1715                 switch (server->secType) {
1716                 case Kerberos:
1717                         if (vol->cred_uid != ses->cred_uid)
1718                                 continue;
1719                         break;
1720                 default:
1721                         /* anything else takes username/password */
1722                         if (strncmp(ses->userName, vol->username,
1723                                     MAX_USERNAME_SIZE))
1724                                 continue;
1725                         if (strlen(vol->username) != 0 &&
1726                             ses->password != NULL &&
1727                             strncmp(ses->password,
1728                                     vol->password ? vol->password : "",
1729                                     MAX_PASSWORD_SIZE))
1730                                 continue;
1731                 }
1732                 ++ses->ses_count;
1733                 spin_unlock(&cifs_tcp_ses_lock);
1734                 return ses;
1735         }
1736         spin_unlock(&cifs_tcp_ses_lock);
1737         return NULL;
1738 }
1739
1740 static void
1741 cifs_put_smb_ses(struct cifsSesInfo *ses)
1742 {
1743         int xid;
1744         struct TCP_Server_Info *server = ses->server;
1745
1746         cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1747         spin_lock(&cifs_tcp_ses_lock);
1748         if (--ses->ses_count > 0) {
1749                 spin_unlock(&cifs_tcp_ses_lock);
1750                 return;
1751         }
1752
1753         list_del_init(&ses->smb_ses_list);
1754         spin_unlock(&cifs_tcp_ses_lock);
1755
1756         if (ses->status == CifsGood) {
1757                 xid = GetXid();
1758                 CIFSSMBLogoff(xid, ses);
1759                 _FreeXid(xid);
1760         }
1761         sesInfoFree(ses);
1762         cifs_put_tcp_session(server);
1763 }
1764
1765 static struct cifsSesInfo *
1766 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1767 {
1768         int rc = -ENOMEM, xid;
1769         struct cifsSesInfo *ses;
1770
1771         xid = GetXid();
1772
1773         ses = cifs_find_smb_ses(server, volume_info);
1774         if (ses) {
1775                 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1776
1777                 mutex_lock(&ses->session_mutex);
1778                 rc = cifs_negotiate_protocol(xid, ses);
1779                 if (rc) {
1780                         mutex_unlock(&ses->session_mutex);
1781                         /* problem -- put our ses reference */
1782                         cifs_put_smb_ses(ses);
1783                         FreeXid(xid);
1784                         return ERR_PTR(rc);
1785                 }
1786                 if (ses->need_reconnect) {
1787                         cFYI(1, "Session needs reconnect");
1788                         rc = cifs_setup_session(xid, ses,
1789                                                 volume_info->local_nls);
1790                         if (rc) {
1791                                 mutex_unlock(&ses->session_mutex);
1792                                 /* problem -- put our reference */
1793                                 cifs_put_smb_ses(ses);
1794                                 FreeXid(xid);
1795                                 return ERR_PTR(rc);
1796                         }
1797                 }
1798                 mutex_unlock(&ses->session_mutex);
1799
1800                 /* existing SMB ses has a server reference already */
1801                 cifs_put_tcp_session(server);
1802                 FreeXid(xid);
1803                 return ses;
1804         }
1805
1806         cFYI(1, "Existing smb sess not found");
1807         ses = sesInfoAlloc();
1808         if (ses == NULL)
1809                 goto get_ses_fail;
1810
1811         ses->tilen = 0;
1812         ses->tiblob = NULL;
1813         /* new SMB session uses our server ref */
1814         ses->server = server;
1815         if (server->addr.sockAddr6.sin6_family == AF_INET6)
1816                 sprintf(ses->serverName, "%pI6",
1817                         &server->addr.sockAddr6.sin6_addr);
1818         else
1819                 sprintf(ses->serverName, "%pI4",
1820                         &server->addr.sockAddr.sin_addr.s_addr);
1821
1822         if (volume_info->username)
1823                 strncpy(ses->userName, volume_info->username,
1824                         MAX_USERNAME_SIZE);
1825
1826         /* volume_info->password freed at unmount */
1827         if (volume_info->password) {
1828                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1829                 if (!ses->password)
1830                         goto get_ses_fail;
1831         }
1832         if (volume_info->domainname) {
1833                 int len = strlen(volume_info->domainname);
1834                 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1835                 if (ses->domainName)
1836                         strcpy(ses->domainName, volume_info->domainname);
1837         }
1838         ses->cred_uid = volume_info->cred_uid;
1839         ses->linux_uid = volume_info->linux_uid;
1840         ses->overrideSecFlg = volume_info->secFlg;
1841
1842         mutex_lock(&ses->session_mutex);
1843         rc = cifs_negotiate_protocol(xid, ses);
1844         if (!rc)
1845                 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1846         mutex_unlock(&ses->session_mutex);
1847         if (rc)
1848                 goto get_ses_fail;
1849
1850         /* success, put it on the list */
1851         spin_lock(&cifs_tcp_ses_lock);
1852         list_add(&ses->smb_ses_list, &server->smb_ses_list);
1853         spin_unlock(&cifs_tcp_ses_lock);
1854
1855         FreeXid(xid);
1856         return ses;
1857
1858 get_ses_fail:
1859         sesInfoFree(ses);
1860         FreeXid(xid);
1861         return ERR_PTR(rc);
1862 }
1863
1864 static struct cifsTconInfo *
1865 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1866 {
1867         struct list_head *tmp;
1868         struct cifsTconInfo *tcon;
1869
1870         spin_lock(&cifs_tcp_ses_lock);
1871         list_for_each(tmp, &ses->tcon_list) {
1872                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1873                 if (tcon->tidStatus == CifsExiting)
1874                         continue;
1875                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1876                         continue;
1877
1878                 ++tcon->tc_count;
1879                 spin_unlock(&cifs_tcp_ses_lock);
1880                 return tcon;
1881         }
1882         spin_unlock(&cifs_tcp_ses_lock);
1883         return NULL;
1884 }
1885
1886 static void
1887 cifs_put_tcon(struct cifsTconInfo *tcon)
1888 {
1889         int xid;
1890         struct cifsSesInfo *ses = tcon->ses;
1891
1892         cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1893         spin_lock(&cifs_tcp_ses_lock);
1894         if (--tcon->tc_count > 0) {
1895                 spin_unlock(&cifs_tcp_ses_lock);
1896                 return;
1897         }
1898
1899         list_del_init(&tcon->tcon_list);
1900         spin_unlock(&cifs_tcp_ses_lock);
1901
1902         xid = GetXid();
1903         CIFSSMBTDis(xid, tcon);
1904         _FreeXid(xid);
1905
1906         cifs_fscache_release_super_cookie(tcon);
1907         tconInfoFree(tcon);
1908         cifs_put_smb_ses(ses);
1909 }
1910
1911 static struct cifsTconInfo *
1912 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1913 {
1914         int rc, xid;
1915         struct cifsTconInfo *tcon;
1916
1917         tcon = cifs_find_tcon(ses, volume_info->UNC);
1918         if (tcon) {
1919                 cFYI(1, "Found match on UNC path");
1920                 /* existing tcon already has a reference */
1921                 cifs_put_smb_ses(ses);
1922                 if (tcon->seal != volume_info->seal)
1923                         cERROR(1, "transport encryption setting "
1924                                    "conflicts with existing tid");
1925                 return tcon;
1926         }
1927
1928         tcon = tconInfoAlloc();
1929         if (tcon == NULL) {
1930                 rc = -ENOMEM;
1931                 goto out_fail;
1932         }
1933
1934         tcon->ses = ses;
1935         if (volume_info->password) {
1936                 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1937                 if (!tcon->password) {
1938                         rc = -ENOMEM;
1939                         goto out_fail;
1940                 }
1941         }
1942
1943         if (strchr(volume_info->UNC + 3, '\\') == NULL
1944             && strchr(volume_info->UNC + 3, '/') == NULL) {
1945                 cERROR(1, "Missing share name");
1946                 rc = -ENODEV;
1947                 goto out_fail;
1948         }
1949
1950         /* BB Do we need to wrap session_mutex around
1951          * this TCon call and Unix SetFS as
1952          * we do on SessSetup and reconnect? */
1953         xid = GetXid();
1954         rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1955         FreeXid(xid);
1956         cFYI(1, "CIFS Tcon rc = %d", rc);
1957         if (rc)
1958                 goto out_fail;
1959
1960         if (volume_info->nodfs) {
1961                 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1962                 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1963         }
1964         tcon->seal = volume_info->seal;
1965         /* we can have only one retry value for a connection
1966            to a share so for resources mounted more than once
1967            to the same server share the last value passed in
1968            for the retry flag is used */
1969         tcon->retry = volume_info->retry;
1970         tcon->nocase = volume_info->nocase;
1971         tcon->local_lease = volume_info->local_lease;
1972
1973         spin_lock(&cifs_tcp_ses_lock);
1974         list_add(&tcon->tcon_list, &ses->tcon_list);
1975         spin_unlock(&cifs_tcp_ses_lock);
1976
1977         cifs_fscache_get_super_cookie(tcon);
1978
1979         return tcon;
1980
1981 out_fail:
1982         tconInfoFree(tcon);
1983         return ERR_PTR(rc);
1984 }
1985
1986 void
1987 cifs_put_tlink(struct tcon_link *tlink)
1988 {
1989         if (!tlink || IS_ERR(tlink))
1990                 return;
1991
1992         if (!atomic_dec_and_test(&tlink->tl_count) ||
1993             test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
1994                 tlink->tl_time = jiffies;
1995                 return;
1996         }
1997
1998         if (!IS_ERR(tlink_tcon(tlink)))
1999                 cifs_put_tcon(tlink_tcon(tlink));
2000         kfree(tlink);
2001         return;
2002 }
2003
2004 int
2005 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2006              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2007              struct dfs_info3_param **preferrals, int remap)
2008 {
2009         char *temp_unc;
2010         int rc = 0;
2011
2012         *pnum_referrals = 0;
2013         *preferrals = NULL;
2014
2015         if (pSesInfo->ipc_tid == 0) {
2016                 temp_unc = kmalloc(2 /* for slashes */ +
2017                         strnlen(pSesInfo->serverName,
2018                                 SERVER_NAME_LEN_WITH_NULL * 2)
2019                                  + 1 + 4 /* slash IPC$ */  + 2,
2020                                 GFP_KERNEL);
2021                 if (temp_unc == NULL)
2022                         return -ENOMEM;
2023                 temp_unc[0] = '\\';
2024                 temp_unc[1] = '\\';
2025                 strcpy(temp_unc + 2, pSesInfo->serverName);
2026                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2027                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2028                 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2029                 kfree(temp_unc);
2030         }
2031         if (rc == 0)
2032                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2033                                      pnum_referrals, nls_codepage, remap);
2034         /* BB map targetUNCs to dfs_info3 structures, here or
2035                 in CIFSGetDFSRefer BB */
2036
2037         return rc;
2038 }
2039
2040 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2041 static struct lock_class_key cifs_key[2];
2042 static struct lock_class_key cifs_slock_key[2];
2043
2044 static inline void
2045 cifs_reclassify_socket4(struct socket *sock)
2046 {
2047         struct sock *sk = sock->sk;
2048         BUG_ON(sock_owned_by_user(sk));
2049         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2050                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2051 }
2052
2053 static inline void
2054 cifs_reclassify_socket6(struct socket *sock)
2055 {
2056         struct sock *sk = sock->sk;
2057         BUG_ON(sock_owned_by_user(sk));
2058         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2059                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2060 }
2061 #else
2062 static inline void
2063 cifs_reclassify_socket4(struct socket *sock)
2064 {
2065 }
2066
2067 static inline void
2068 cifs_reclassify_socket6(struct socket *sock)
2069 {
2070 }
2071 #endif
2072
2073 /* See RFC1001 section 14 on representation of Netbios names */
2074 static void rfc1002mangle(char *target, char *source, unsigned int length)
2075 {
2076         unsigned int i, j;
2077
2078         for (i = 0, j = 0; i < (length); i++) {
2079                 /* mask a nibble at a time and encode */
2080                 target[j] = 'A' + (0x0F & (source[i] >> 4));
2081                 target[j+1] = 'A' + (0x0F & source[i]);
2082                 j += 2;
2083         }
2084
2085 }
2086
2087 static int
2088 bind_socket(struct TCP_Server_Info *server)
2089 {
2090         int rc = 0;
2091         if (server->srcaddr.ss_family != AF_UNSPEC) {
2092                 /* Bind to the specified local IP address */
2093                 struct socket *socket = server->ssocket;
2094                 rc = socket->ops->bind(socket,
2095                                        (struct sockaddr *) &server->srcaddr,
2096                                        sizeof(server->srcaddr));
2097                 if (rc < 0) {
2098                         struct sockaddr_in *saddr4;
2099                         struct sockaddr_in6 *saddr6;
2100                         saddr4 = (struct sockaddr_in *)&server->srcaddr;
2101                         saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2102                         if (saddr6->sin6_family == AF_INET6)
2103                                 cERROR(1, "cifs: "
2104                                        "Failed to bind to: %pI6c, error: %d\n",
2105                                        &saddr6->sin6_addr, rc);
2106                         else
2107                                 cERROR(1, "cifs: "
2108                                        "Failed to bind to: %pI4, error: %d\n",
2109                                        &saddr4->sin_addr.s_addr, rc);
2110                 }
2111         }
2112         return rc;
2113 }
2114
2115 static int
2116 ipv4_connect(struct TCP_Server_Info *server)
2117 {
2118         int rc = 0;
2119         int val;
2120         bool connected = false;
2121         __be16 orig_port = 0;
2122         struct socket *socket = server->ssocket;
2123
2124         if (socket == NULL) {
2125                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
2126                                       IPPROTO_TCP, &socket);
2127                 if (rc < 0) {
2128                         cERROR(1, "Error %d creating socket", rc);
2129                         return rc;
2130                 }
2131
2132                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2133                 cFYI(1, "Socket created");
2134                 server->ssocket = socket;
2135                 socket->sk->sk_allocation = GFP_NOFS;
2136                 cifs_reclassify_socket4(socket);
2137         }
2138
2139         rc = bind_socket(server);
2140         if (rc < 0)
2141                 return rc;
2142
2143         /* user overrode default port */
2144         if (server->addr.sockAddr.sin_port) {
2145                 rc = socket->ops->connect(socket, (struct sockaddr *)
2146                                           &server->addr.sockAddr,
2147                                           sizeof(struct sockaddr_in), 0);
2148                 if (rc >= 0)
2149                         connected = true;
2150         }
2151
2152         if (!connected) {
2153                 /* save original port so we can retry user specified port
2154                         later if fall back ports fail this time  */
2155                 orig_port = server->addr.sockAddr.sin_port;
2156
2157                 /* do not retry on the same port we just failed on */
2158                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
2159                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
2160                         rc = socket->ops->connect(socket,
2161                                                 (struct sockaddr *)
2162                                                 &server->addr.sockAddr,
2163                                                 sizeof(struct sockaddr_in), 0);
2164                         if (rc >= 0)
2165                                 connected = true;
2166                 }
2167         }
2168         if (!connected) {
2169                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
2170                 rc = socket->ops->connect(socket, (struct sockaddr *)
2171                                               &server->addr.sockAddr,
2172                                               sizeof(struct sockaddr_in), 0);
2173                 if (rc >= 0)
2174                         connected = true;
2175         }
2176
2177         /* give up here - unless we want to retry on different
2178                 protocol families some day */
2179         if (!connected) {
2180                 if (orig_port)
2181                         server->addr.sockAddr.sin_port = orig_port;
2182                 cFYI(1, "Error %d connecting to server via ipv4", rc);
2183                 sock_release(socket);
2184                 server->ssocket = NULL;
2185                 return rc;
2186         }
2187
2188
2189         /*
2190          * Eventually check for other socket options to change from
2191          *  the default. sock_setsockopt not used because it expects
2192          *  user space buffer
2193          */
2194         socket->sk->sk_rcvtimeo = 7 * HZ;
2195         socket->sk->sk_sndtimeo = 5 * HZ;
2196
2197         /* make the bufsizes depend on wsize/rsize and max requests */
2198         if (server->noautotune) {
2199                 if (socket->sk->sk_sndbuf < (200 * 1024))
2200                         socket->sk->sk_sndbuf = 200 * 1024;
2201                 if (socket->sk->sk_rcvbuf < (140 * 1024))
2202                         socket->sk->sk_rcvbuf = 140 * 1024;
2203         }
2204
2205         if (server->tcp_nodelay) {
2206                 val = 1;
2207                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2208                                 (char *)&val, sizeof(val));
2209                 if (rc)
2210                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2211         }
2212
2213          cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2214                  socket->sk->sk_sndbuf,
2215                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2216
2217         /* send RFC1001 sessinit */
2218         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2219                 /* some servers require RFC1001 sessinit before sending
2220                 negprot - BB check reconnection in case where second
2221                 sessinit is sent but no second negprot */
2222                 struct rfc1002_session_packet *ses_init_buf;
2223                 struct smb_hdr *smb_buf;
2224                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2225                                        GFP_KERNEL);
2226                 if (ses_init_buf) {
2227                         ses_init_buf->trailer.session_req.called_len = 32;
2228                         if (server->server_RFC1001_name &&
2229                             server->server_RFC1001_name[0] != 0)
2230                                 rfc1002mangle(ses_init_buf->trailer.
2231                                                 session_req.called_name,
2232                                               server->server_RFC1001_name,
2233                                               RFC1001_NAME_LEN_WITH_NULL);
2234                         else
2235                                 rfc1002mangle(ses_init_buf->trailer.
2236                                                 session_req.called_name,
2237                                               DEFAULT_CIFS_CALLED_NAME,
2238                                               RFC1001_NAME_LEN_WITH_NULL);
2239
2240                         ses_init_buf->trailer.session_req.calling_len = 32;
2241
2242                         /* calling name ends in null (byte 16) from old smb
2243                         convention. */
2244                         if (server->workstation_RFC1001_name &&
2245                             server->workstation_RFC1001_name[0] != 0)
2246                                 rfc1002mangle(ses_init_buf->trailer.
2247                                                 session_req.calling_name,
2248                                               server->workstation_RFC1001_name,
2249                                               RFC1001_NAME_LEN_WITH_NULL);
2250                         else
2251                                 rfc1002mangle(ses_init_buf->trailer.
2252                                                 session_req.calling_name,
2253                                               "LINUX_CIFS_CLNT",
2254                                               RFC1001_NAME_LEN_WITH_NULL);
2255
2256                         ses_init_buf->trailer.session_req.scope1 = 0;
2257                         ses_init_buf->trailer.session_req.scope2 = 0;
2258                         smb_buf = (struct smb_hdr *)ses_init_buf;
2259                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
2260                         smb_buf->smb_buf_length = 0x81000044;
2261                         rc = smb_send(server, smb_buf, 0x44);
2262                         kfree(ses_init_buf);
2263                         msleep(1); /* RFC1001 layer in at least one server
2264                                       requires very short break before negprot
2265                                       presumably because not expecting negprot
2266                                       to follow so fast.  This is a simple
2267                                       solution that works without
2268                                       complicating the code and causes no
2269                                       significant slowing down on mount
2270                                       for everyone else */
2271                 }
2272                 /* else the negprot may still work without this
2273                 even though malloc failed */
2274
2275         }
2276
2277         return rc;
2278 }
2279
2280 static int
2281 ipv6_connect(struct TCP_Server_Info *server)
2282 {
2283         int rc = 0;
2284         int val;
2285         bool connected = false;
2286         __be16 orig_port = 0;
2287         struct socket *socket = server->ssocket;
2288
2289         if (socket == NULL) {
2290                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2291                                       IPPROTO_TCP, &socket);
2292                 if (rc < 0) {
2293                         cERROR(1, "Error %d creating ipv6 socket", rc);
2294                         socket = NULL;
2295                         return rc;
2296                 }
2297
2298                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2299                 cFYI(1, "ipv6 Socket created");
2300                 server->ssocket = socket;
2301                 socket->sk->sk_allocation = GFP_NOFS;
2302                 cifs_reclassify_socket6(socket);
2303         }
2304
2305         rc = bind_socket(server);
2306         if (rc < 0)
2307                 return rc;
2308
2309         /* user overrode default port */
2310         if (server->addr.sockAddr6.sin6_port) {
2311                 rc = socket->ops->connect(socket,
2312                                 (struct sockaddr *) &server->addr.sockAddr6,
2313                                 sizeof(struct sockaddr_in6), 0);
2314                 if (rc >= 0)
2315                         connected = true;
2316         }
2317
2318         if (!connected) {
2319                 /* save original port so we can retry user specified port
2320                         later if fall back ports fail this time  */
2321
2322                 orig_port = server->addr.sockAddr6.sin6_port;
2323                 /* do not retry on the same port we just failed on */
2324                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2325                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2326                         rc = socket->ops->connect(socket, (struct sockaddr *)
2327                                         &server->addr.sockAddr6,
2328                                         sizeof(struct sockaddr_in6), 0);
2329                         if (rc >= 0)
2330                                 connected = true;
2331                 }
2332         }
2333         if (!connected) {
2334                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2335                 rc = socket->ops->connect(socket, (struct sockaddr *)
2336                                 &server->addr.sockAddr6,
2337                                 sizeof(struct sockaddr_in6), 0);
2338                 if (rc >= 0)
2339                         connected = true;
2340         }
2341
2342         /* give up here - unless we want to retry on different
2343                 protocol families some day */
2344         if (!connected) {
2345                 if (orig_port)
2346                         server->addr.sockAddr6.sin6_port = orig_port;
2347                 cFYI(1, "Error %d connecting to server via ipv6", rc);
2348                 sock_release(socket);
2349                 server->ssocket = NULL;
2350                 return rc;
2351         }
2352
2353         /*
2354          * Eventually check for other socket options to change from
2355          * the default. sock_setsockopt not used because it expects
2356          * user space buffer
2357          */
2358         socket->sk->sk_rcvtimeo = 7 * HZ;
2359         socket->sk->sk_sndtimeo = 5 * HZ;
2360
2361         if (server->tcp_nodelay) {
2362                 val = 1;
2363                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2364                                 (char *)&val, sizeof(val));
2365                 if (rc)
2366                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2367         }
2368
2369         server->ssocket = socket;
2370
2371         return rc;
2372 }
2373
2374 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2375                           struct super_block *sb, struct smb_vol *vol_info)
2376 {
2377         /* if we are reconnecting then should we check to see if
2378          * any requested capabilities changed locally e.g. via
2379          * remount but we can not do much about it here
2380          * if they have (even if we could detect it by the following)
2381          * Perhaps we could add a backpointer to array of sb from tcon
2382          * or if we change to make all sb to same share the same
2383          * sb as NFS - then we only have one backpointer to sb.
2384          * What if we wanted to mount the server share twice once with
2385          * and once without posixacls or posix paths? */
2386         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2387
2388         if (vol_info && vol_info->no_linux_ext) {
2389                 tcon->fsUnixInfo.Capability = 0;
2390                 tcon->unix_ext = 0; /* Unix Extensions disabled */
2391                 cFYI(1, "Linux protocol extensions disabled");
2392                 return;
2393         } else if (vol_info)
2394                 tcon->unix_ext = 1; /* Unix Extensions supported */
2395
2396         if (tcon->unix_ext == 0) {
2397                 cFYI(1, "Unix extensions disabled so not set on reconnect");
2398                 return;
2399         }
2400
2401         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2402                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2403
2404                 /* check for reconnect case in which we do not
2405                    want to change the mount behavior if we can avoid it */
2406                 if (vol_info == NULL) {
2407                         /* turn off POSIX ACL and PATHNAMES if not set
2408                            originally at mount time */
2409                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2410                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2411                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2412                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2413                                         cERROR(1, "POSIXPATH support change");
2414                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2415                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2416                                 cERROR(1, "possible reconnect error");
2417                                 cERROR(1, "server disabled POSIX path support");
2418                         }
2419                 }
2420
2421                 cap &= CIFS_UNIX_CAP_MASK;
2422                 if (vol_info && vol_info->no_psx_acl)
2423                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2424                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2425                         cFYI(1, "negotiated posix acl support");
2426                         if (sb)
2427                                 sb->s_flags |= MS_POSIXACL;
2428                 }
2429
2430                 if (vol_info && vol_info->posix_paths == 0)
2431                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2432                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2433                         cFYI(1, "negotiate posix pathnames");
2434                         if (sb)
2435                                 CIFS_SB(sb)->mnt_cifs_flags |=
2436                                         CIFS_MOUNT_POSIX_PATHS;
2437                 }
2438
2439                 /* We might be setting the path sep back to a different
2440                 form if we are reconnecting and the server switched its
2441                 posix path capability for this share */
2442                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2443                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2444
2445                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2446                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2447                                 CIFS_SB(sb)->rsize = 127 * 1024;
2448                                 cFYI(DBG2, "larger reads not supported by srv");
2449                         }
2450                 }
2451
2452
2453                 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2454 #ifdef CONFIG_CIFS_DEBUG2
2455                 if (cap & CIFS_UNIX_FCNTL_CAP)
2456                         cFYI(1, "FCNTL cap");
2457                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2458                         cFYI(1, "EXTATTR cap");
2459                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2460                         cFYI(1, "POSIX path cap");
2461                 if (cap & CIFS_UNIX_XATTR_CAP)
2462                         cFYI(1, "XATTR cap");
2463                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2464                         cFYI(1, "POSIX ACL cap");
2465                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2466                         cFYI(1, "very large read cap");
2467                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2468                         cFYI(1, "very large write cap");
2469 #endif /* CIFS_DEBUG2 */
2470                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2471                         if (vol_info == NULL) {
2472                                 cFYI(1, "resetting capabilities failed");
2473                         } else
2474                                 cERROR(1, "Negotiating Unix capabilities "
2475                                            "with the server failed.  Consider "
2476                                            "mounting with the Unix Extensions\n"
2477                                            "disabled, if problems are found, "
2478                                            "by specifying the nounix mount "
2479                                            "option.");
2480
2481                 }
2482         }
2483 }
2484
2485 static void
2486 convert_delimiter(char *path, char delim)
2487 {
2488         int i;
2489         char old_delim;
2490
2491         if (path == NULL)
2492                 return;
2493
2494         if (delim == '/')
2495                 old_delim = '\\';
2496         else
2497                 old_delim = '/';
2498
2499         for (i = 0; path[i] != '\0'; i++) {
2500                 if (path[i] == old_delim)
2501                         path[i] = delim;
2502         }
2503 }
2504
2505 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2506                           struct cifs_sb_info *cifs_sb)
2507 {
2508         INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2509
2510         if (pvolume_info->rsize > CIFSMaxBufSize) {
2511                 cERROR(1, "rsize %d too large, using MaxBufSize",
2512                         pvolume_info->rsize);
2513                 cifs_sb->rsize = CIFSMaxBufSize;
2514         } else if ((pvolume_info->rsize) &&
2515                         (pvolume_info->rsize <= CIFSMaxBufSize))
2516                 cifs_sb->rsize = pvolume_info->rsize;
2517         else /* default */
2518                 cifs_sb->rsize = CIFSMaxBufSize;
2519
2520         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2521                 cERROR(1, "wsize %d too large, using 4096 instead",
2522                           pvolume_info->wsize);
2523                 cifs_sb->wsize = 4096;
2524         } else if (pvolume_info->wsize)
2525                 cifs_sb->wsize = pvolume_info->wsize;
2526         else
2527                 cifs_sb->wsize = min_t(const int,
2528                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2529                                         127*1024);
2530                 /* old default of CIFSMaxBufSize was too small now
2531                    that SMB Write2 can send multiple pages in kvec.
2532                    RFC1001 does not describe what happens when frame
2533                    bigger than 128K is sent so use that as max in
2534                    conjunction with 52K kvec constraint on arch with 4K
2535                    page size  */
2536
2537         if (cifs_sb->rsize < 2048) {
2538                 cifs_sb->rsize = 2048;
2539                 /* Windows ME may prefer this */
2540                 cFYI(1, "readsize set to minimum: 2048");
2541         }
2542         /* calculate prepath */
2543         cifs_sb->prepath = pvolume_info->prepath;
2544         if (cifs_sb->prepath) {
2545                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2546                 /* we can not convert the / to \ in the path
2547                 separators in the prefixpath yet because we do not
2548                 know (until reset_cifs_unix_caps is called later)
2549                 whether POSIX PATH CAP is available. We normalize
2550                 the / to \ after reset_cifs_unix_caps is called */
2551                 pvolume_info->prepath = NULL;
2552         } else
2553                 cifs_sb->prepathlen = 0;
2554         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2555         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2556         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2557         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2558         cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
2559                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2560
2561         if (pvolume_info->noperm)
2562                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2563         if (pvolume_info->setuids)
2564                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2565         if (pvolume_info->server_ino)
2566                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2567         if (pvolume_info->remap)
2568                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2569         if (pvolume_info->no_xattr)
2570                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2571         if (pvolume_info->sfu_emul)
2572                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2573         if (pvolume_info->nobrl)
2574                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2575         if (pvolume_info->nostrictsync)
2576                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2577         if (pvolume_info->mand_lock)
2578                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2579         if (pvolume_info->cifs_acl)
2580                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2581         if (pvolume_info->override_uid)
2582                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2583         if (pvolume_info->override_gid)
2584                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2585         if (pvolume_info->dynperm)
2586                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2587         if (pvolume_info->fsc)
2588                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2589         if (pvolume_info->multiuser)
2590                 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2591                                             CIFS_MOUNT_NO_PERM);
2592         if (pvolume_info->direct_io) {
2593                 cFYI(1, "mounting share using direct i/o");
2594                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2595         }
2596         if (pvolume_info->mfsymlinks) {
2597                 if (pvolume_info->sfu_emul) {
2598                         cERROR(1,  "mount option mfsymlinks ignored if sfu "
2599                                    "mount option is used");
2600                 } else {
2601                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2602                 }
2603         }
2604
2605         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2606                 cERROR(1, "mount option dynperm ignored if cifsacl "
2607                            "mount option supported");
2608 }
2609
2610 static int
2611 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2612                    struct cifs_sb_info *cifs_sb, const char *full_path)
2613 {
2614         int rc;
2615         FILE_ALL_INFO *pfile_info;
2616
2617         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2618         if (pfile_info == NULL)
2619                 return -ENOMEM;
2620
2621         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2622                               0 /* not legacy */, cifs_sb->local_nls,
2623                               cifs_sb->mnt_cifs_flags &
2624                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2625         kfree(pfile_info);
2626         return rc;
2627 }
2628
2629 static void
2630 cleanup_volume_info(struct smb_vol **pvolume_info)
2631 {
2632         struct smb_vol *volume_info;
2633
2634         if (!pvolume_info || !*pvolume_info)
2635                 return;
2636
2637         volume_info = *pvolume_info;
2638         kzfree(volume_info->password);
2639         kfree(volume_info->UNC);
2640         kfree(volume_info->prepath);
2641         kfree(volume_info);
2642         *pvolume_info = NULL;
2643         return;
2644 }
2645
2646 #ifdef CONFIG_CIFS_DFS_UPCALL
2647 /* build_path_to_root returns full path to root when
2648  * we do not have an exiting connection (tcon) */
2649 static char *
2650 build_unc_path_to_root(const struct smb_vol *volume_info,
2651                 const struct cifs_sb_info *cifs_sb)
2652 {
2653         char *full_path;
2654
2655         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2656         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2657         if (full_path == NULL)
2658                 return ERR_PTR(-ENOMEM);
2659
2660         strncpy(full_path, volume_info->UNC, unc_len);
2661         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2662                 int i;
2663                 for (i = 0; i < unc_len; i++) {
2664                         if (full_path[i] == '\\')
2665                                 full_path[i] = '/';
2666                 }
2667         }
2668
2669         if (cifs_sb->prepathlen)
2670                 strncpy(full_path + unc_len, cifs_sb->prepath,
2671                                 cifs_sb->prepathlen);
2672
2673         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2674         return full_path;
2675 }
2676 #endif
2677
2678 int
2679 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2680                 char *mount_data_global, const char *devname)
2681 {
2682         int rc;
2683         int xid;
2684         struct smb_vol *volume_info;
2685         struct cifsSesInfo *pSesInfo;
2686         struct cifsTconInfo *tcon;
2687         struct TCP_Server_Info *srvTcp;
2688         char   *full_path;
2689         char *mount_data = mount_data_global;
2690         struct tcon_link *tlink;
2691 #ifdef CONFIG_CIFS_DFS_UPCALL
2692         struct dfs_info3_param *referrals = NULL;
2693         unsigned int num_referrals = 0;
2694         int referral_walks_count = 0;
2695 try_mount_again:
2696 #endif
2697         rc = 0;
2698         tcon = NULL;
2699         pSesInfo = NULL;
2700         srvTcp = NULL;
2701         full_path = NULL;
2702         tlink = NULL;
2703
2704         xid = GetXid();
2705
2706         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2707         if (!volume_info) {
2708                 rc = -ENOMEM;
2709                 goto out;
2710         }
2711
2712         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2713                 rc = -EINVAL;
2714                 goto out;
2715         }
2716
2717         if (volume_info->nullauth) {
2718                 cFYI(1, "null user");
2719                 volume_info->username = "";
2720         } else if (volume_info->username) {
2721                 /* BB fixme parse for domain name here */
2722                 cFYI(1, "Username: %s", volume_info->username);
2723         } else {
2724                 cifserror("No username specified");
2725         /* In userspace mount helper we can get user name from alternate
2726            locations such as env variables and files on disk */
2727                 rc = -EINVAL;
2728                 goto out;
2729         }
2730
2731         /* this is needed for ASCII cp to Unicode converts */
2732         if (volume_info->iocharset == NULL) {
2733                 /* load_nls_default cannot return null */
2734                 volume_info->local_nls = load_nls_default();
2735         } else {
2736                 volume_info->local_nls = load_nls(volume_info->iocharset);
2737                 if (volume_info->local_nls == NULL) {
2738                         cERROR(1, "CIFS mount error: iocharset %s not found",
2739                                  volume_info->iocharset);
2740                         rc = -ELIBACC;
2741                         goto out;
2742                 }
2743         }
2744         cifs_sb->local_nls = volume_info->local_nls;
2745
2746         /* get a reference to a tcp session */
2747         srvTcp = cifs_get_tcp_session(volume_info);
2748         if (IS_ERR(srvTcp)) {
2749                 rc = PTR_ERR(srvTcp);
2750                 goto out;
2751         }
2752
2753         /* get a reference to a SMB session */
2754         pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2755         if (IS_ERR(pSesInfo)) {
2756                 rc = PTR_ERR(pSesInfo);
2757                 pSesInfo = NULL;
2758                 goto mount_fail_check;
2759         }
2760
2761         setup_cifs_sb(volume_info, cifs_sb);
2762         if (pSesInfo->capabilities & CAP_LARGE_FILES)
2763                 sb->s_maxbytes = MAX_LFS_FILESIZE;
2764         else
2765                 sb->s_maxbytes = MAX_NON_LFS;
2766
2767         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2768         sb->s_time_gran = 100;
2769
2770         /* search for existing tcon to this server share */
2771         tcon = cifs_get_tcon(pSesInfo, volume_info);
2772         if (IS_ERR(tcon)) {
2773                 rc = PTR_ERR(tcon);
2774                 tcon = NULL;
2775                 goto remote_path_check;
2776         }
2777
2778         /* do not care if following two calls succeed - informational */
2779         if (!tcon->ipc) {
2780                 CIFSSMBQFSDeviceInfo(xid, tcon);
2781                 CIFSSMBQFSAttributeInfo(xid, tcon);
2782         }
2783
2784         /* tell server which Unix caps we support */
2785         if (tcon->ses->capabilities & CAP_UNIX)
2786                 /* reset of caps checks mount to see if unix extensions
2787                    disabled for just this mount */
2788                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2789         else
2790                 tcon->unix_ext = 0; /* server does not support them */
2791
2792         /* convert forward to back slashes in prepath here if needed */
2793         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2794                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2795
2796         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2797                 cifs_sb->rsize = 1024 * 127;
2798                 cFYI(DBG2, "no very large read support, rsize now 127K");
2799         }
2800         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2801                 cifs_sb->wsize = min(cifs_sb->wsize,
2802                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2803         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2804                 cifs_sb->rsize = min(cifs_sb->rsize,
2805                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2806
2807 remote_path_check:
2808         /* check if a whole path (including prepath) is not remote */
2809         if (!rc && cifs_sb->prepathlen && tcon) {
2810                 /* build_path_to_root works only when we have a valid tcon */
2811                 full_path = cifs_build_path_to_root(cifs_sb);
2812                 if (full_path == NULL) {
2813                         rc = -ENOMEM;
2814                         goto mount_fail_check;
2815                 }
2816                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2817                 if (rc != -EREMOTE) {
2818                         kfree(full_path);
2819                         goto mount_fail_check;
2820                 }
2821                 kfree(full_path);
2822         }
2823
2824         /* get referral if needed */
2825         if (rc == -EREMOTE) {
2826 #ifdef CONFIG_CIFS_DFS_UPCALL
2827                 if (referral_walks_count > MAX_NESTED_LINKS) {
2828                         /*
2829                          * BB: when we implement proper loop detection,
2830                          *     we will remove this check. But now we need it
2831                          *     to prevent an indefinite loop if 'DFS tree' is
2832                          *     misconfigured (i.e. has loops).
2833                          */
2834                         rc = -ELOOP;
2835                         goto mount_fail_check;
2836                 }
2837                 /* convert forward to back slashes in prepath here if needed */
2838                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2839                         convert_delimiter(cifs_sb->prepath,
2840                                         CIFS_DIR_SEP(cifs_sb));
2841                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2842                 if (IS_ERR(full_path)) {
2843                         rc = PTR_ERR(full_path);
2844                         goto mount_fail_check;
2845                 }
2846
2847                 cFYI(1, "Getting referral for: %s", full_path);
2848                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2849                         cifs_sb->local_nls, &num_referrals, &referrals,
2850                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2851                 if (!rc && num_referrals > 0) {
2852                         char *fake_devname = NULL;
2853
2854                         if (mount_data != mount_data_global)
2855                                 kfree(mount_data);
2856
2857                         mount_data = cifs_compose_mount_options(
2858                                         cifs_sb->mountdata, full_path + 1,
2859                                         referrals, &fake_devname);
2860
2861                         free_dfs_info_array(referrals, num_referrals);
2862                         kfree(fake_devname);
2863                         kfree(full_path);
2864
2865                         if (IS_ERR(mount_data)) {
2866                                 rc = PTR_ERR(mount_data);
2867                                 mount_data = NULL;
2868                                 goto mount_fail_check;
2869                         }
2870
2871                         if (tcon)
2872                                 cifs_put_tcon(tcon);
2873                         else if (pSesInfo)
2874                                 cifs_put_smb_ses(pSesInfo);
2875
2876                         cleanup_volume_info(&volume_info);
2877                         referral_walks_count++;
2878                         FreeXid(xid);
2879                         goto try_mount_again;
2880                 }
2881 #else /* No DFS support, return error on mount */
2882                 rc = -EOPNOTSUPP;
2883 #endif
2884         }
2885
2886         if (rc)
2887                 goto mount_fail_check;
2888
2889         /* now, hang the tcon off of the superblock */
2890         tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
2891         if (tlink == NULL) {
2892                 rc = -ENOMEM;
2893                 goto mount_fail_check;
2894         }
2895
2896         tlink->tl_index = pSesInfo->linux_uid;
2897         tlink->tl_tcon = tcon;
2898         tlink->tl_time = jiffies;
2899         set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2900         set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2901
2902         rc = radix_tree_preload(GFP_KERNEL);
2903         if (rc == -ENOMEM) {
2904                 kfree(tlink);
2905                 goto mount_fail_check;
2906         }
2907
2908         spin_lock(&cifs_sb->tlink_tree_lock);
2909         radix_tree_insert(&cifs_sb->tlink_tree, pSesInfo->linux_uid, tlink);
2910         radix_tree_tag_set(&cifs_sb->tlink_tree, pSesInfo->linux_uid,
2911                            CIFS_TLINK_MASTER_TAG);
2912         spin_unlock(&cifs_sb->tlink_tree_lock);
2913         radix_tree_preload_end();
2914
2915         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
2916                                 TLINK_IDLE_EXPIRE);
2917
2918 mount_fail_check:
2919         /* on error free sesinfo and tcon struct if needed */
2920         if (rc) {
2921                 if (mount_data != mount_data_global)
2922                         kfree(mount_data);
2923                 /* If find_unc succeeded then rc == 0 so we can not end */
2924                 /* up accidently freeing someone elses tcon struct */
2925                 if (tcon)
2926                         cifs_put_tcon(tcon);
2927                 else if (pSesInfo)
2928                         cifs_put_smb_ses(pSesInfo);
2929                 else
2930                         cifs_put_tcp_session(srvTcp);
2931                 goto out;
2932         }
2933
2934         /* volume_info->password is freed above when existing session found
2935         (in which case it is not needed anymore) but when new sesion is created
2936         the password ptr is put in the new session structure (in which case the
2937         password will be freed at unmount time) */
2938 out:
2939         /* zero out password before freeing */
2940         cleanup_volume_info(&volume_info);
2941         FreeXid(xid);
2942         return rc;
2943 }
2944
2945 int
2946 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2947          const char *tree, struct cifsTconInfo *tcon,
2948          const struct nls_table *nls_codepage)
2949 {
2950         struct smb_hdr *smb_buffer;
2951         struct smb_hdr *smb_buffer_response;
2952         TCONX_REQ *pSMB;
2953         TCONX_RSP *pSMBr;
2954         unsigned char *bcc_ptr;
2955         int rc = 0;
2956         int length, bytes_left;
2957         __u16 count;
2958
2959         if (ses == NULL)
2960                 return -EIO;
2961
2962         smb_buffer = cifs_buf_get();
2963         if (smb_buffer == NULL)
2964                 return -ENOMEM;
2965
2966         smb_buffer_response = smb_buffer;
2967
2968         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2969                         NULL /*no tid */ , 4 /*wct */ );
2970
2971         smb_buffer->Mid = GetNextMid(ses->server);
2972         smb_buffer->Uid = ses->Suid;
2973         pSMB = (TCONX_REQ *) smb_buffer;
2974         pSMBr = (TCONX_RSP *) smb_buffer_response;
2975
2976         pSMB->AndXCommand = 0xFF;
2977         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2978         bcc_ptr = &pSMB->Password[0];
2979         if ((ses->server->secMode) & SECMODE_USER) {
2980                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2981                 *bcc_ptr = 0; /* password is null byte */
2982                 bcc_ptr++;              /* skip password */
2983                 /* already aligned so no need to do it below */
2984         } else {
2985                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2986                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2987                    specified as required (when that support is added to
2988                    the vfs in the future) as only NTLM or the much
2989                    weaker LANMAN (which we do not send by default) is accepted
2990                    by Samba (not sure whether other servers allow
2991                    NTLMv2 password here) */
2992 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2993                 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2994                     (ses->server->secType == LANMAN))
2995                         calc_lanman_hash(tcon->password, ses->cryptKey,
2996                                          ses->server->secMode &
2997                                             SECMODE_PW_ENCRYPT ? true : false,
2998                                          bcc_ptr);
2999                 else
3000 #endif /* CIFS_WEAK_PW_HASH */
3001                 SMBNTencrypt(tcon->password, ses->cryptKey, bcc_ptr);
3002
3003                 bcc_ptr += CIFS_SESS_KEY_SIZE;
3004                 if (ses->capabilities & CAP_UNICODE) {
3005                         /* must align unicode strings */
3006                         *bcc_ptr = 0; /* null byte password */
3007                         bcc_ptr++;
3008                 }
3009         }
3010
3011         if (ses->server->secMode &
3012                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3013                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3014
3015         if (ses->capabilities & CAP_STATUS32) {
3016                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3017         }
3018         if (ses->capabilities & CAP_DFS) {
3019                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3020         }
3021         if (ses->capabilities & CAP_UNICODE) {
3022                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3023                 length =
3024                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3025                         6 /* max utf8 char length in bytes */ *
3026                         (/* server len*/ + 256 /* share len */), nls_codepage);
3027                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3028                 bcc_ptr += 2;   /* skip trailing null */
3029         } else {                /* ASCII */
3030                 strcpy(bcc_ptr, tree);
3031                 bcc_ptr += strlen(tree) + 1;
3032         }
3033         strcpy(bcc_ptr, "?????");
3034         bcc_ptr += strlen("?????");
3035         bcc_ptr += 1;
3036         count = bcc_ptr - &pSMB->Password[0];
3037         pSMB->hdr.smb_buf_length += count;
3038         pSMB->ByteCount = cpu_to_le16(count);
3039
3040         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3041                          CIFS_STD_OP);
3042
3043         /* above now done in SendReceive */
3044         if ((rc == 0) && (tcon != NULL)) {
3045                 bool is_unicode;
3046
3047                 tcon->tidStatus = CifsGood;
3048                 tcon->need_reconnect = false;
3049                 tcon->tid = smb_buffer_response->Tid;
3050                 bcc_ptr = pByteArea(smb_buffer_response);
3051                 bytes_left = BCC(smb_buffer_response);
3052                 length = strnlen(bcc_ptr, bytes_left - 2);
3053                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3054                         is_unicode = true;
3055                 else
3056                         is_unicode = false;
3057
3058
3059                 /* skip service field (NB: this field is always ASCII) */
3060                 if (length == 3) {
3061                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3062                             (bcc_ptr[2] == 'C')) {
3063                                 cFYI(1, "IPC connection");
3064                                 tcon->ipc = 1;
3065                         }
3066                 } else if (length == 2) {
3067                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3068                                 /* the most common case */
3069                                 cFYI(1, "disk share connection");
3070                         }
3071                 }
3072                 bcc_ptr += length + 1;
3073                 bytes_left -= (length + 1);
3074                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3075
3076                 /* mostly informational -- no need to fail on error here */
3077                 kfree(tcon->nativeFileSystem);
3078                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3079                                                       bytes_left, is_unicode,
3080                                                       nls_codepage);
3081
3082                 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3083
3084                 if ((smb_buffer_response->WordCount == 3) ||
3085                          (smb_buffer_response->WordCount == 7))
3086                         /* field is in same location */
3087                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3088                 else
3089                         tcon->Flags = 0;
3090                 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3091         } else if ((rc == 0) && tcon == NULL) {
3092                 /* all we need to save for IPC$ connection */
3093                 ses->ipc_tid = smb_buffer_response->Tid;
3094         }
3095
3096         cifs_buf_release(smb_buffer);
3097         return rc;
3098 }
3099
3100 int
3101 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3102 {
3103         int i, ret;
3104         char *tmp;
3105         struct tcon_link *tlink[8];
3106         unsigned long index = 0;
3107
3108         cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3109
3110         do {
3111                 spin_lock(&cifs_sb->tlink_tree_lock);
3112                 ret = radix_tree_gang_lookup(&cifs_sb->tlink_tree,
3113                                              (void **)tlink, index,
3114                                              ARRAY_SIZE(tlink));
3115                 /* increment index for next pass */
3116                 if (ret > 0)
3117                         index = tlink[ret - 1]->tl_index + 1;
3118                 for (i = 0; i < ret; i++) {
3119                         cifs_get_tlink(tlink[i]);
3120                         clear_bit(TCON_LINK_IN_TREE, &tlink[i]->tl_flags);
3121                         radix_tree_delete(&cifs_sb->tlink_tree,
3122                                                         tlink[i]->tl_index);
3123                 }
3124                 spin_unlock(&cifs_sb->tlink_tree_lock);
3125
3126                 for (i = 0; i < ret; i++)
3127                         cifs_put_tlink(tlink[i]);
3128         } while (ret != 0);
3129
3130         tmp = cifs_sb->prepath;
3131         cifs_sb->prepathlen = 0;
3132         cifs_sb->prepath = NULL;
3133         kfree(tmp);
3134
3135         return 0;
3136 }
3137
3138 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3139 {
3140         int rc = 0;
3141         struct TCP_Server_Info *server = ses->server;
3142
3143         /* only send once per connect */
3144         if (server->maxBuf != 0)
3145                 return 0;
3146
3147         rc = CIFSSMBNegotiate(xid, ses);
3148         if (rc == -EAGAIN) {
3149                 /* retry only once on 1st time connection */
3150                 rc = CIFSSMBNegotiate(xid, ses);
3151                 if (rc == -EAGAIN)
3152                         rc = -EHOSTDOWN;
3153         }
3154         if (rc == 0) {
3155                 spin_lock(&GlobalMid_Lock);
3156                 if (server->tcpStatus != CifsExiting)
3157                         server->tcpStatus = CifsGood;
3158                 else
3159                         rc = -EHOSTDOWN;
3160                 spin_unlock(&GlobalMid_Lock);
3161
3162         }
3163
3164         return rc;
3165 }
3166
3167
3168 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3169                         struct nls_table *nls_info)
3170 {
3171         int rc = 0;
3172         struct TCP_Server_Info *server = ses->server;
3173
3174         ses->flags = 0;
3175         ses->capabilities = server->capabilities;
3176         if (linuxExtEnabled == 0)
3177                 ses->capabilities &= (~CAP_UNIX);
3178
3179         cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3180                  server->secMode, server->capabilities, server->timeAdj);
3181
3182         rc = CIFS_SessSetup(xid, ses, nls_info);
3183         if (rc) {
3184                 cERROR(1, "Send error in SessSetup = %d", rc);
3185         } else {
3186                 mutex_lock(&ses->server->srv_mutex);
3187                 if (!server->session_estab) {
3188                         server->session_key.response = ses->auth_key.response;
3189                         server->session_key.len = ses->auth_key.len;
3190                         server->sequence_number = 0x2;
3191                         server->session_estab = true;
3192                         ses->auth_key.response = NULL;
3193                 }
3194                 mutex_unlock(&server->srv_mutex);
3195
3196                 cFYI(1, "CIFS Session Established successfully");
3197                 spin_lock(&GlobalMid_Lock);
3198                 ses->status = CifsGood;
3199                 ses->need_reconnect = false;
3200                 spin_unlock(&GlobalMid_Lock);
3201         }
3202
3203         kfree(ses->auth_key.response);
3204         ses->auth_key.response = NULL;
3205         ses->auth_key.len = 0;
3206
3207         return rc;
3208 }
3209
3210 static struct cifsTconInfo *
3211 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3212 {
3213         struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3214         struct cifsSesInfo *ses;
3215         struct cifsTconInfo *tcon = NULL;
3216         struct smb_vol *vol_info;
3217         char username[MAX_USERNAME_SIZE + 1];
3218
3219         vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3220         if (vol_info == NULL) {
3221                 tcon = ERR_PTR(-ENOMEM);
3222                 goto out;
3223         }
3224
3225         snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3226         vol_info->username = username;
3227         vol_info->local_nls = cifs_sb->local_nls;
3228         vol_info->linux_uid = fsuid;
3229         vol_info->cred_uid = fsuid;
3230         vol_info->UNC = master_tcon->treeName;
3231         vol_info->retry = master_tcon->retry;
3232         vol_info->nocase = master_tcon->nocase;
3233         vol_info->local_lease = master_tcon->local_lease;
3234         vol_info->no_linux_ext = !master_tcon->unix_ext;
3235
3236         /* FIXME: allow for other secFlg settings */
3237         vol_info->secFlg = CIFSSEC_MUST_KRB5;
3238
3239         /* get a reference for the same TCP session */
3240         spin_lock(&cifs_tcp_ses_lock);
3241         ++master_tcon->ses->server->srv_count;
3242         spin_unlock(&cifs_tcp_ses_lock);
3243
3244         ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3245         if (IS_ERR(ses)) {
3246                 tcon = (struct cifsTconInfo *)ses;
3247                 cifs_put_tcp_session(master_tcon->ses->server);
3248                 goto out;
3249         }
3250
3251         tcon = cifs_get_tcon(ses, vol_info);
3252         if (IS_ERR(tcon)) {
3253                 cifs_put_smb_ses(ses);
3254                 goto out;
3255         }
3256
3257         if (ses->capabilities & CAP_UNIX)
3258                 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3259 out:
3260         kfree(vol_info);
3261
3262         return tcon;
3263 }
3264
3265 static struct tcon_link *
3266 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3267 {
3268         struct tcon_link *tlink;
3269         unsigned int ret;
3270
3271         spin_lock(&cifs_sb->tlink_tree_lock);
3272         ret = radix_tree_gang_lookup_tag(&cifs_sb->tlink_tree, (void **)&tlink,
3273                                         0, 1, CIFS_TLINK_MASTER_TAG);
3274         spin_unlock(&cifs_sb->tlink_tree_lock);
3275
3276         /* the master tcon should always be present */
3277         if (ret == 0)
3278                 BUG();
3279
3280         return tlink;
3281 }
3282
3283 struct cifsTconInfo *
3284 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3285 {
3286         return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3287 }
3288
3289 static int
3290 cifs_sb_tcon_pending_wait(void *unused)
3291 {
3292         schedule();
3293         return signal_pending(current) ? -ERESTARTSYS : 0;
3294 }
3295
3296 /*
3297  * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3298  * current task.
3299  *
3300  * If the superblock doesn't refer to a multiuser mount, then just return
3301  * the master tcon for the mount.
3302  *
3303  * First, search the radix tree for an existing tcon for this fsuid. If one
3304  * exists, then check to see if it's pending construction. If it is then wait
3305  * for construction to complete. Once it's no longer pending, check to see if
3306  * it failed and either return an error or retry construction, depending on
3307  * the timeout.
3308  *
3309  * If one doesn't exist then insert a new tcon_link struct into the tree and
3310  * try to construct a new one.
3311  */
3312 struct tcon_link *
3313 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3314 {
3315         int ret;
3316         unsigned long fsuid = (unsigned long) current_fsuid();
3317         struct tcon_link *tlink, *newtlink;
3318
3319         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3320                 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3321
3322         spin_lock(&cifs_sb->tlink_tree_lock);
3323         tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
3324         if (tlink)
3325                 cifs_get_tlink(tlink);
3326         spin_unlock(&cifs_sb->tlink_tree_lock);
3327
3328         if (tlink == NULL) {
3329                 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3330                 if (newtlink == NULL)
3331                         return ERR_PTR(-ENOMEM);
3332                 newtlink->tl_index = fsuid;
3333                 newtlink->tl_tcon = ERR_PTR(-EACCES);
3334                 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3335                 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3336                 cifs_get_tlink(newtlink);
3337
3338                 ret = radix_tree_preload(GFP_KERNEL);
3339                 if (ret != 0) {
3340                         kfree(newtlink);
3341                         return ERR_PTR(ret);
3342                 }
3343
3344                 spin_lock(&cifs_sb->tlink_tree_lock);
3345                 /* was one inserted after previous search? */
3346                 tlink = radix_tree_lookup(&cifs_sb->tlink_tree, fsuid);
3347                 if (tlink) {
3348                         cifs_get_tlink(tlink);
3349                         spin_unlock(&cifs_sb->tlink_tree_lock);
3350                         radix_tree_preload_end();
3351                         kfree(newtlink);
3352                         goto wait_for_construction;
3353                 }
3354                 ret = radix_tree_insert(&cifs_sb->tlink_tree, fsuid, newtlink);
3355                 spin_unlock(&cifs_sb->tlink_tree_lock);
3356                 radix_tree_preload_end();
3357                 if (ret) {
3358                         kfree(newtlink);
3359                         return ERR_PTR(ret);
3360                 }
3361                 tlink = newtlink;
3362         } else {
3363 wait_for_construction:
3364                 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3365                                   cifs_sb_tcon_pending_wait,
3366                                   TASK_INTERRUPTIBLE);
3367                 if (ret) {
3368                         cifs_put_tlink(tlink);
3369                         return ERR_PTR(ret);
3370                 }
3371
3372                 /* if it's good, return it */
3373                 if (!IS_ERR(tlink->tl_tcon))
3374                         return tlink;
3375
3376                 /* return error if we tried this already recently */
3377                 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3378                         cifs_put_tlink(tlink);
3379                         return ERR_PTR(-EACCES);
3380                 }
3381
3382                 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3383                         goto wait_for_construction;
3384         }
3385
3386         tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3387         clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3388         wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3389
3390         if (IS_ERR(tlink->tl_tcon)) {
3391                 cifs_put_tlink(tlink);
3392                 return ERR_PTR(-EACCES);
3393         }
3394
3395         return tlink;
3396 }
3397
3398 /*
3399  * periodic workqueue job that scans tcon_tree for a superblock and closes
3400  * out tcons.
3401  */
3402 static void
3403 cifs_prune_tlinks(struct work_struct *work)
3404 {
3405         struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3406                                                     prune_tlinks.work);
3407         struct tcon_link *tlink[8];
3408         unsigned long now = jiffies;
3409         unsigned long index = 0;
3410         int i, ret;
3411
3412         do {
3413                 spin_lock(&cifs_sb->tlink_tree_lock);
3414                 ret = radix_tree_gang_lookup(&cifs_sb->tlink_tree,
3415                                              (void **)tlink, index,
3416                                              ARRAY_SIZE(tlink));
3417                 /* increment index for next pass */
3418                 if (ret > 0)
3419                         index = tlink[ret - 1]->tl_index + 1;
3420                 for (i = 0; i < ret; i++) {
3421                         if (test_bit(TCON_LINK_MASTER, &tlink[i]->tl_flags) ||
3422                             atomic_read(&tlink[i]->tl_count) != 0 ||
3423                             time_after(tlink[i]->tl_time + TLINK_IDLE_EXPIRE,
3424                                        now)) {
3425                                 tlink[i] = NULL;
3426                                 continue;
3427                         }
3428                         cifs_get_tlink(tlink[i]);
3429                         clear_bit(TCON_LINK_IN_TREE, &tlink[i]->tl_flags);
3430                         radix_tree_delete(&cifs_sb->tlink_tree,
3431                                           tlink[i]->tl_index);
3432                 }
3433                 spin_unlock(&cifs_sb->tlink_tree_lock);
3434
3435                 for (i = 0; i < ret; i++) {
3436                         if (tlink[i] != NULL)
3437                                 cifs_put_tlink(tlink[i]);
3438                 }
3439         } while (ret != 0);
3440
3441         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3442                                 TLINK_IDLE_EXPIRE);
3443 }