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 /* SMB echo "timeout" -- FIXME: tunable? */
  56 #define SMB_ECHO_INTERVAL (60 * HZ)
  57
  58 extern mempool_t *cifs_req_poolp;
  59
  60 /* FIXME: should these be tunable? */
  61 #define TLINK_ERROR_EXPIRE      (1 * HZ)
  62 #define TLINK_IDLE_EXPIRE       (600 * HZ)
  63
  64 static int ip_connect(struct TCP_Server_Info *server);
  65 static int generic_ip_connect(struct TCP_Server_Info *server);
  66 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
  67 static void cifs_prune_tlinks(struct work_struct *work);
  68
  69 /*
  70  * cifs tcp session reconnection
  71  *
  72  * mark tcp session as reconnecting so temporarily locked
  73  * mark all smb sessions as reconnecting for tcp session
  74  * reconnect tcp session
  75  * wake up waiters on reconnection? - (not needed currently)
  76  */
  77 static int
  78 cifs_reconnect(struct TCP_Server_Info *server)
  79 {
  80         int rc = 0;
  81         struct list_head *tmp, *tmp2;
  82         struct cifsSesInfo *ses;
  83         struct cifsTconInfo *tcon;
  84         struct mid_q_entry *mid_entry;
  85         struct list_head retry_list;
  86
  87         spin_lock(&GlobalMid_Lock);
  88         if (server->tcpStatus == CifsExiting) {
  89                 /* the demux thread will exit normally
  90                 next time through the loop */
  91                 spin_unlock(&GlobalMid_Lock);
  92                 return rc;
  93         } else
  94                 server->tcpStatus = CifsNeedReconnect;
  95         spin_unlock(&GlobalMid_Lock);
  96         server->maxBuf = 0;
  97
  98         cFYI(1, "Reconnecting tcp session");
  99
 100         /* before reconnecting the tcp session, mark the smb session (uid)
 101                 and the tid bad so they are not used until reconnected */
 102         cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
 103         spin_lock(&cifs_tcp_ses_lock);
 104         list_for_each(tmp, &server->smb_ses_list) {
 105                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 106                 ses->need_reconnect = true;
 107                 ses->ipc_tid = 0;
 108                 list_for_each(tmp2, &ses->tcon_list) {
 109                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 110                         tcon->need_reconnect = true;
 111                 }
 112         }
 113         spin_unlock(&cifs_tcp_ses_lock);
 114
 115         /* do not want to be sending data on a socket we are freeing */
 116         cFYI(1, "%s: tearing down socket", __func__);
 117         mutex_lock(&server->srv_mutex);
 118         if (server->ssocket) {
 119                 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
 120                         server->ssocket->flags);
 121                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 122                 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
 123                         server->ssocket->state,
 124                         server->ssocket->flags);
 125                 sock_release(server->ssocket);
 126                 server->ssocket = NULL;
 127         }
 128         server->sequence_number = 0;
 129         server->session_estab = false;
 130         kfree(server->session_key.response);
 131         server->session_key.response = NULL;
 132         server->session_key.len = 0;
 133         server->lstrp = jiffies;
 134         mutex_unlock(&server->srv_mutex);
 135
 136         /* mark submitted MIDs for retry and issue callback */
 137         INIT_LIST_HEAD(&retry_list);
 138         cFYI(1, "%s: moving mids to private list", __func__);
 139         spin_lock(&GlobalMid_Lock);
 140         list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
 141                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 142                 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
 143                         mid_entry->midState = MID_RETRY_NEEDED;
 144                 list_move(&mid_entry->qhead, &retry_list);
 145         }
 146         spin_unlock(&GlobalMid_Lock);
 147
 148         cFYI(1, "%s: issuing mid callbacks", __func__);
 149         list_for_each_safe(tmp, tmp2, &retry_list) {
 150                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 151                 list_del_init(&mid_entry->qhead);
 152                 mid_entry->callback(mid_entry);
 153         }
 154
 155         while (server->tcpStatus == CifsNeedReconnect) {
 156                 try_to_freeze();
 157
 158                 /* we should try only the port we connected to before */
 159                 rc = generic_ip_connect(server);
 160                 if (rc) {
 161                         cFYI(1, "reconnect error %d", rc);
 162                         msleep(3000);
 163                 } else {
 164                         atomic_inc(&tcpSesReconnectCount);
 165                         spin_lock(&GlobalMid_Lock);
 166                         if (server->tcpStatus != CifsExiting)
 167                                 server->tcpStatus = CifsNeedNegotiate;
 168                         spin_unlock(&GlobalMid_Lock);
 169                 }
 170         }
 171
 172         return rc;
 173 }
 174
 175 /*
 176         return codes:
 177                 0       not a transact2, or all data present
 178                 >0      transact2 with that much data missing
 179                 -EINVAL = invalid transact2
 180
 181  */
 182 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 183 {
 184         struct smb_t2_rsp *pSMBt;
 185         int remaining;
 186         __u16 total_data_size, data_in_this_rsp;
 187
 188         if (pSMB->Command != SMB_COM_TRANSACTION2)
 189                 return 0;
 190
 191         /* check for plausible wct, bcc and t2 data and parm sizes */
 192         /* check for parm and data offset going beyond end of smb */
 193         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 194                 cFYI(1, "invalid transact2 word count");
 195                 return -EINVAL;
 196         }
 197
 198         pSMBt = (struct smb_t2_rsp *)pSMB;
 199
 200         total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 201         data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 202
 203         if (total_data_size == data_in_this_rsp)
 204                 return 0;
 205         else if (total_data_size < data_in_this_rsp) {
 206                 cFYI(1, "total data %d smaller than data in frame %d",
 207                         total_data_size, data_in_this_rsp);
 208                 return -EINVAL;
 209         }
 210
 211         remaining = total_data_size - data_in_this_rsp;
 212
 213         cFYI(1, "missing %d bytes from transact2, check next response",
 214                 remaining);
 215         if (total_data_size > maxBufSize) {
 216                 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 217                         total_data_size, maxBufSize);
 218                 return -EINVAL;
 219         }
 220         return remaining;
 221 }
 222
 223 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 224 {
 225         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 226         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 227         char *data_area_of_target;
 228         char *data_area_of_buf2;
 229         int remaining;
 230         unsigned int byte_count, total_in_buf;
 231         __u16 total_data_size, total_in_buf2;
 232
 233         total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 234
 235         if (total_data_size !=
 236             get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
 237                 cFYI(1, "total data size of primary and secondary t2 differ");
 238
 239         total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 240
 241         remaining = total_data_size - total_in_buf;
 242
 243         if (remaining < 0)
 244                 return -EPROTO;
 245
 246         if (remaining == 0) /* nothing to do, ignore */
 247                 return 0;
 248
 249         total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
 250         if (remaining < total_in_buf2) {
 251                 cFYI(1, "transact2 2nd response contains too much data");
 252         }
 253
 254         /* find end of first SMB data area */
 255         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 256                                 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
 257         /* validate target area */
 258
 259         data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
 260                                 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
 261
 262         data_area_of_target += total_in_buf;
 263
 264         /* copy second buffer into end of first buffer */
 265         total_in_buf += total_in_buf2;
 266         /* is the result too big for the field? */
 267         if (total_in_buf > USHRT_MAX)
 268                 return -EPROTO;
 269         put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
 270
 271         /* fix up the BCC */
 272         byte_count = get_bcc(pTargetSMB);
 273         byte_count += total_in_buf2;
 274         /* is the result too big for the field? */
 275         if (byte_count > USHRT_MAX)
 276                 return -EPROTO;
 277         put_bcc(byte_count, pTargetSMB);
 278
 279         byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
 280         byte_count += total_in_buf2;
 281         /* don't allow buffer to overflow */
 282         if (byte_count > CIFSMaxBufSize)
 283                 return -ENOBUFS;
 284         pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
 285
 286         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 287
 288         if (remaining == total_in_buf2) {
 289                 cFYI(1, "found the last secondary response");
 290                 return 0; /* we are done */
 291         } else /* more responses to go */
 292                 return 1;
 293 }
 294
 295 static void
 296 cifs_echo_request(struct work_struct *work)
 297 {
 298         int rc;
 299         struct TCP_Server_Info *server = container_of(work,
 300                                         struct TCP_Server_Info, echo.work);
 301
 302         /*
 303          * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
 304          * done, which is indicated by maxBuf != 0. Also, no need to ping if
 305          * we got a response recently
 306          */
 307         if (server->maxBuf == 0 ||
 308             time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
 309                 goto requeue_echo;
 310
 311         rc = CIFSSMBEcho(server);
 312         if (rc)
 313                 cFYI(1, "Unable to send echo request to server: %s",
 314                         server->hostname);
 315
 316 requeue_echo:
 317         queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
 318 }
 319
 320 static int
 321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 322 {
 323         int length;
 324         unsigned int pdu_length, total_read;
 325         struct smb_hdr *smb_buffer = NULL;
 326         struct smb_hdr *bigbuf = NULL;
 327         struct smb_hdr *smallbuf = NULL;
 328         struct msghdr smb_msg;
 329         struct kvec iov;
 330         struct socket *csocket = server->ssocket;
 331         struct list_head *tmp, *tmp2;
 332         struct task_struct *task_to_wake = NULL;
 333         struct mid_q_entry *mid_entry;
 334         char temp;
 335         bool isLargeBuf = false;
 336         bool isMultiRsp;
 337         int reconnect;
 338
 339         current->flags |= PF_MEMALLOC;
 340         cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
 341
 342         length = atomic_inc_return(&tcpSesAllocCount);
 343         if (length > 1)
 344                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 345                                 GFP_KERNEL);
 346
 347         set_freezable();
 348         while (server->tcpStatus != CifsExiting) {
 349                 if (try_to_freeze())
 350                         continue;
 351                 if (bigbuf == NULL) {
 352                         bigbuf = cifs_buf_get();
 353                         if (!bigbuf) {
 354                                 cERROR(1, "No memory for large SMB response");
 355                                 msleep(3000);
 356                                 /* retry will check if exiting */
 357                                 continue;
 358                         }
 359                 } else if (isLargeBuf) {
 360                         /* we are reusing a dirty large buf, clear its start */
 361                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 362                 }
 363
 364                 if (smallbuf == NULL) {
 365                         smallbuf = cifs_small_buf_get();
 366                         if (!smallbuf) {
 367                                 cERROR(1, "No memory for SMB response");
 368                                 msleep(1000);
 369                                 /* retry will check if exiting */
 370                                 continue;
 371                         }
 372                         /* beginning of smb buffer is cleared in our buf_get */
 373                 } else /* if existing small buf clear beginning */
 374                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 375
 376                 isLargeBuf = false;
 377                 isMultiRsp = false;
 378                 smb_buffer = smallbuf;
 379                 iov.iov_base = smb_buffer;
 380                 iov.iov_len = 4;
 381                 smb_msg.msg_control = NULL;
 382                 smb_msg.msg_controllen = 0;
 383                 pdu_length = 4; /* enough to get RFC1001 header */
 384
 385 incomplete_rcv:
 386                 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
 387                     time_after(jiffies, server->lstrp +
 388                                         (echo_retries * SMB_ECHO_INTERVAL))) {
 389                         cERROR(1, "Server %s has not responded in %d seconds. "
 390                                   "Reconnecting...", server->hostname,
 391                                   (echo_retries * SMB_ECHO_INTERVAL / HZ));
 392                         cifs_reconnect(server);
 393                         csocket = server->ssocket;
 394                         wake_up(&server->response_q);
 395                         continue;
 396                 }
 397
 398                 length =
 399                     kernel_recvmsg(csocket, &smb_msg,
 400                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 401
 402                 if (server->tcpStatus == CifsExiting) {
 403                         break;
 404                 } else if (server->tcpStatus == CifsNeedReconnect) {
 405                         cFYI(1, "Reconnect after server stopped responding");
 406                         cifs_reconnect(server);
 407                         cFYI(1, "call to reconnect done");
 408                         csocket = server->ssocket;
 409                         continue;
 410                 } else if (length == -ERESTARTSYS ||
 411                            length == -EAGAIN ||
 412                            length == -EINTR) {
 413                         msleep(1); /* minimum sleep to prevent looping
 414                                 allowing socket to clear and app threads to set
 415                                 tcpStatus CifsNeedReconnect if server hung */
 416                         if (pdu_length < 4) {
 417                                 iov.iov_base = (4 - pdu_length) +
 418                                                         (char *)smb_buffer;
 419                                 iov.iov_len = pdu_length;
 420                                 smb_msg.msg_control = NULL;
 421                                 smb_msg.msg_controllen = 0;
 422                                 goto incomplete_rcv;
 423                         } else
 424                                 continue;
 425                 } else if (length <= 0) {
 426                         cFYI(1, "Reconnect after unexpected peek error %d",
 427                                 length);
 428                         cifs_reconnect(server);
 429                         csocket = server->ssocket;
 430                         wake_up(&server->response_q);
 431                         continue;
 432                 } else if (length < pdu_length) {
 433                         cFYI(1, "requested %d bytes but only got %d bytes",
 434                                   pdu_length, length);
 435                         pdu_length -= length;
 436                         msleep(1);
 437                         goto incomplete_rcv;
 438                 }
 439
 440                 /* The right amount was read from socket - 4 bytes */
 441                 /* so we can now interpret the length field */
 442
 443                 /* the first byte big endian of the length field,
 444                 is actually not part of the length but the type
 445                 with the most common, zero, as regular data */
 446                 temp = *((char *) smb_buffer);
 447
 448                 /* Note that FC 1001 length is big endian on the wire,
 449                 but we convert it here so it is always manipulated
 450                 as host byte order */
 451                 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
 452
 453                 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
 454
 455                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 456                         continue;
 457                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 458                         cFYI(1, "Good RFC 1002 session rsp");
 459                         continue;
 460                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 461                         /* we get this from Windows 98 instead of
 462                            an error on SMB negprot response */
 463                         cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
 464                                 pdu_length);
 465                         /* give server a second to clean up  */
 466                         msleep(1000);
 467                         /* always try 445 first on reconnect since we get NACK
 468                          * on some if we ever connected to port 139 (the NACK
 469                          * is since we do not begin with RFC1001 session
 470                          * initialize frame)
 471                          */
 472                         cifs_set_port((struct sockaddr *)
 473                                         &server->dstaddr, CIFS_PORT);
 474                         cifs_reconnect(server);
 475                         csocket = server->ssocket;
 476                         wake_up(&server->response_q);
 477                         continue;
 478                 } else if (temp != (char) 0) {
 479                         cERROR(1, "Unknown RFC 1002 frame");
 480                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 481                                       length);
 482                         cifs_reconnect(server);
 483                         csocket = server->ssocket;
 484                         continue;
 485                 }
 486
 487                 /* else we have an SMB response */
 488                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 489                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 490                         cERROR(1, "Invalid size SMB length %d pdu_length %d",
 491                                         length, pdu_length+4);
 492                         cifs_reconnect(server);
 493                         csocket = server->ssocket;
 494                         wake_up(&server->response_q);
 495                         continue;
 496                 }
 497
 498                 /* else length ok */
 499                 reconnect = 0;
 500
 501                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 502                         isLargeBuf = true;
 503                         memcpy(bigbuf, smallbuf, 4);
 504                         smb_buffer = bigbuf;
 505                 }
 506                 length = 0;
 507                 iov.iov_base = 4 + (char *)smb_buffer;
 508                 iov.iov_len = pdu_length;
 509                 for (total_read = 0; total_read < pdu_length;
 510                      total_read += length) {
 511                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 512                                                 pdu_length - total_read, 0);
 513                         if (server->tcpStatus == CifsExiting) {
 514                                 /* then will exit */
 515                                 reconnect = 2;
 516                                 break;
 517                         } else if (server->tcpStatus == CifsNeedReconnect) {
 518                                 cifs_reconnect(server);
 519                                 csocket = server->ssocket;
 520                                 /* Reconnect wakes up rspns q */
 521                                 /* Now we will reread sock */
 522                                 reconnect = 1;
 523                                 break;
 524                         } else if (length == -ERESTARTSYS ||
 525                                    length == -EAGAIN ||
 526                                    length == -EINTR) {
 527                                 msleep(1); /* minimum sleep to prevent looping,
 528                                               allowing socket to clear and app
 529                                               threads to set tcpStatus
 530                                               CifsNeedReconnect if server hung*/
 531                                 length = 0;
 532                                 continue;
 533                         } else if (length <= 0) {
 534                                 cERROR(1, "Received no data, expecting %d",
 535                                               pdu_length - total_read);
 536                                 cifs_reconnect(server);
 537                                 csocket = server->ssocket;
 538                                 reconnect = 1;
 539                                 break;
 540                         }
 541                 }
 542                 if (reconnect == 2)
 543                         break;
 544                 else if (reconnect == 1)
 545                         continue;
 546
 547                 total_read += 4; /* account for rfc1002 hdr */
 548
 549                 dump_smb(smb_buffer, total_read);
 550
 551                 /*
 552                  * We know that we received enough to get to the MID as we
 553                  * checked the pdu_length earlier. Now check to see
 554                  * if the rest of the header is OK. We borrow the length
 555                  * var for the rest of the loop to avoid a new stack var.
 556                  *
 557                  * 48 bytes is enough to display the header and a little bit
 558                  * into the payload for debugging purposes.
 559                  */
 560                 length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
 561                 if (length != 0)
 562                         cifs_dump_mem("Bad SMB: ", smb_buffer,
 563                                         min_t(unsigned int, total_read, 48));
 564
 565                 mid_entry = NULL;
 566                 server->lstrp = jiffies;
 567
 568                 spin_lock(&GlobalMid_Lock);
 569                 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
 570                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 571
 572                         if (mid_entry->mid != smb_buffer->Mid ||
 573                             mid_entry->midState != MID_REQUEST_SUBMITTED ||
 574                             mid_entry->command != smb_buffer->Command) {
 575                                 mid_entry = NULL;
 576                                 continue;
 577                         }
 578
 579                         if (length == 0 &&
 580                             check2ndT2(smb_buffer, server->maxBuf) > 0) {
 581                                 /* We have a multipart transact2 resp */
 582                                 isMultiRsp = true;
 583                                 if (mid_entry->resp_buf) {
 584                                         /* merge response - fix up 1st*/
 585                                         length = coalesce_t2(smb_buffer,
 586                                                         mid_entry->resp_buf);
 587                                         if (length > 0) {
 588                                                 length = 0;
 589                                                 mid_entry->multiRsp = true;
 590                                                 break;
 591                                         } else {
 592                                                 /* all parts received or
 593                                                  * packet is malformed
 594                                                  */
 595                                                 mid_entry->multiEnd = true;
 596                                                 goto multi_t2_fnd;
 597                                         }
 598                                 } else {
 599                                         if (!isLargeBuf) {
 600                                                 /*
 601                                                  * FIXME: switch to already
 602                                                  *        allocated largebuf?
 603                                                  */
 604                                                 cERROR(1, "1st trans2 resp "
 605                                                           "needs bigbuf");
 606                                         } else {
 607                                                 /* Have first buffer */
 608                                                 mid_entry->resp_buf =
 609                                                          smb_buffer;
 610                                                 mid_entry->largeBuf = true;
 611                                                 bigbuf = NULL;
 612                                         }
 613                                 }
 614                                 break;
 615                         }
 616                         mid_entry->resp_buf = smb_buffer;
 617                         mid_entry->largeBuf = isLargeBuf;
 618 multi_t2_fnd:
 619                         if (length == 0)
 620                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 621                         else
 622                                 mid_entry->midState = MID_RESPONSE_MALFORMED;
 623 #ifdef CONFIG_CIFS_STATS2
 624                         mid_entry->when_received = jiffies;
 625 #endif
 626                         list_del_init(&mid_entry->qhead);
 627                         break;
 628                 }
 629                 spin_unlock(&GlobalMid_Lock);
 630
 631                 if (mid_entry != NULL) {
 632                         mid_entry->callback(mid_entry);
 633                         /* Was previous buf put in mpx struct for multi-rsp? */
 634                         if (!isMultiRsp) {
 635                                 /* smb buffer will be freed by user thread */
 636                                 if (isLargeBuf)
 637                                         bigbuf = NULL;
 638                                 else
 639                                         smallbuf = NULL;
 640                         }
 641                 } else if (length != 0) {
 642                         /* response sanity checks failed */
 643                         continue;
 644                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 645                            !isMultiRsp) {
 646                         cERROR(1, "No task to wake, unknown frame received! "
 647                                    "NumMids %d", atomic_read(&midCount));
 648                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 649                                       sizeof(struct smb_hdr));
 650 #ifdef CONFIG_CIFS_DEBUG2
 651                         cifs_dump_detail(smb_buffer);
 652                         cifs_dump_mids(server);
 653 #endif /* CIFS_DEBUG2 */
 654
 655                 }
 656         } /* end while !EXITING */
 657
 658         /* take it off the list, if it's not already */
 659         spin_lock(&cifs_tcp_ses_lock);
 660         list_del_init(&server->tcp_ses_list);
 661         spin_unlock(&cifs_tcp_ses_lock);
 662
 663         spin_lock(&GlobalMid_Lock);
 664         server->tcpStatus = CifsExiting;
 665         spin_unlock(&GlobalMid_Lock);
 666         wake_up_all(&server->response_q);
 667
 668         /* check if we have blocked requests that need to free */
 669         /* Note that cifs_max_pending is normally 50, but
 670         can be set at module install time to as little as two */
 671         spin_lock(&GlobalMid_Lock);
 672         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 673                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 674         /* We do not want to set the max_pending too low or we
 675         could end up with the counter going negative */
 676         spin_unlock(&GlobalMid_Lock);
 677         /* Although there should not be any requests blocked on
 678         this queue it can not hurt to be paranoid and try to wake up requests
 679         that may haven been blocked when more than 50 at time were on the wire
 680         to the same server - they now will see the session is in exit state
 681         and get out of SendReceive.  */
 682         wake_up_all(&server->request_q);
 683         /* give those requests time to exit */
 684         msleep(125);
 685
 686         if (server->ssocket) {
 687                 sock_release(csocket);
 688                 server->ssocket = NULL;
 689         }
 690         /* buffer usually freed in free_mid - need to free it here on exit */
 691         cifs_buf_release(bigbuf);
 692         if (smallbuf) /* no sense logging a debug message if NULL */
 693                 cifs_small_buf_release(smallbuf);
 694
 695         if (!list_empty(&server->pending_mid_q)) {
 696                 struct list_head dispose_list;
 697
 698                 INIT_LIST_HEAD(&dispose_list);
 699                 spin_lock(&GlobalMid_Lock);
 700                 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
 701                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 702                         cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
 703                         mid_entry->midState = MID_SHUTDOWN;
 704                         list_move(&mid_entry->qhead, &dispose_list);
 705                 }
 706                 spin_unlock(&GlobalMid_Lock);
 707
 708                 /* now walk dispose list and issue callbacks */
 709                 list_for_each_safe(tmp, tmp2, &dispose_list) {
 710                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 711                         cFYI(1, "Callback mid 0x%x", mid_entry->mid);
 712                         list_del_init(&mid_entry->qhead);
 713                         mid_entry->callback(mid_entry);
 714                 }
 715                 /* 1/8th of sec is more than enough time for them to exit */
 716                 msleep(125);
 717         }
 718
 719         if (!list_empty(&server->pending_mid_q)) {
 720                 /* mpx threads have not exited yet give them
 721                 at least the smb send timeout time for long ops */
 722                 /* due to delays on oplock break requests, we need
 723                 to wait at least 45 seconds before giving up
 724                 on a request getting a response and going ahead
 725                 and killing cifsd */
 726                 cFYI(1, "Wait for exit from demultiplex thread");
 727                 msleep(46000);
 728                 /* if threads still have not exited they are probably never
 729                 coming home not much else we can do but free the memory */
 730         }
 731
 732         kfree(server->hostname);
 733         task_to_wake = xchg(&server->tsk, NULL);
 734         kfree(server);
 735
 736         length = atomic_dec_return(&tcpSesAllocCount);
 737         if (length  > 0)
 738                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 739                                 GFP_KERNEL);
 740
 741         /* if server->tsk was NULL then wait for a signal before exiting */
 742         if (!task_to_wake) {
 743                 set_current_state(TASK_INTERRUPTIBLE);
 744                 while (!signal_pending(current)) {
 745                         schedule();
 746                         set_current_state(TASK_INTERRUPTIBLE);
 747                 }
 748                 set_current_state(TASK_RUNNING);
 749         }
 750
 751         module_put_and_exit(0);
 752 }
 753
 754 /* extract the host portion of the UNC string */
 755 static char *
 756 extract_hostname(const char *unc)
 757 {
 758         const char *src;
 759         char *dst, *delim;
 760         unsigned int len;
 761
 762         /* skip double chars at beginning of string */
 763         /* BB: check validity of these bytes? */
 764         src = unc + 2;
 765
 766         /* delimiter between hostname and sharename is always '\\' now */
 767         delim = strchr(src, '\\');
 768         if (!delim)
 769                 return ERR_PTR(-EINVAL);
 770
 771         len = delim - src;
 772         dst = kmalloc((len + 1), GFP_KERNEL);
 773         if (dst == NULL)
 774                 return ERR_PTR(-ENOMEM);
 775
 776         memcpy(dst, src, len);
 777         dst[len] = '\0';
 778
 779         return dst;
 780 }
 781
 782 static int
 783 cifs_parse_mount_options(const char *mountdata, const char *devname,
 784                          struct smb_vol *vol)
 785 {
 786         char *value, *data, *end;
 787         char *mountdata_copy, *options;
 788         unsigned int  temp_len, i, j;
 789         char separator[2];
 790         short int override_uid = -1;
 791         short int override_gid = -1;
 792         bool uid_specified = false;
 793         bool gid_specified = false;
 794         char *nodename = utsname()->nodename;
 795
 796         separator[0] = ',';
 797         separator[1] = 0;
 798
 799         /*
 800          * does not have to be perfect mapping since field is
 801          * informational, only used for servers that do not support
 802          * port 445 and it can be overridden at mount time
 803          */
 804         memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
 805         for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
 806                 vol->source_rfc1001_name[i] = toupper(nodename[i]);
 807
 808         vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
 809         /* null target name indicates to use *SMBSERVR default called name
 810            if we end up sending RFC1001 session initialize */
 811         vol->target_rfc1001_name[0] = 0;
 812         vol->cred_uid = current_uid();
 813         vol->linux_uid = current_uid();
 814         vol->linux_gid = current_gid();
 815
 816         /* default to only allowing write access to owner of the mount */
 817         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 818
 819         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 820         /* default is always to request posix paths. */
 821         vol->posix_paths = 1;
 822         /* default to using server inode numbers where available */
 823         vol->server_ino = 1;
 824
 825         vol->actimeo = CIFS_DEF_ACTIMEO;
 826
 827         if (!mountdata)
 828                 goto cifs_parse_mount_err;
 829
 830         mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
 831         if (!mountdata_copy)
 832                 goto cifs_parse_mount_err;
 833
 834         options = mountdata_copy;
 835         end = options + strlen(options);
 836         if (strncmp(options, "sep=", 4) == 0) {
 837                 if (options[4] != 0) {
 838                         separator[0] = options[4];
 839                         options += 5;
 840                 } else {
 841                         cFYI(1, "Null separator not allowed");
 842                 }
 843         }
 844
 845         while ((data = strsep(&options, separator)) != NULL) {
 846                 if (!*data)
 847                         continue;
 848                 if ((value = strchr(data, '=')) != NULL)
 849                         *value++ = '\0';
 850
 851                 /* Have to parse this before we parse for "user" */
 852                 if (strnicmp(data, "user_xattr", 10) == 0) {
 853                         vol->no_xattr = 0;
 854                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 855                         vol->no_xattr = 1;
 856                 } else if (strnicmp(data, "user", 4) == 0) {
 857                         if (!value) {
 858                                 printk(KERN_WARNING
 859                                        "CIFS: invalid or missing username\n");
 860                                 goto cifs_parse_mount_err;
 861                         } else if (!*value) {
 862                                 /* null user, ie anonymous, authentication */
 863                                 vol->nullauth = 1;
 864                         }
 865                         if (strnlen(value, MAX_USERNAME_SIZE) <
 866                                                 MAX_USERNAME_SIZE) {
 867                                 vol->username = kstrdup(value, GFP_KERNEL);
 868                                 if (!vol->username) {
 869                                         printk(KERN_WARNING "CIFS: no memory "
 870                                                             "for username\n");
 871                                         goto cifs_parse_mount_err;
 872                                 }
 873                         } else {
 874                                 printk(KERN_WARNING "CIFS: username too long\n");
 875                                 goto cifs_parse_mount_err;
 876                         }
 877                 } else if (strnicmp(data, "pass", 4) == 0) {
 878                         if (!value) {
 879                                 vol->password = NULL;
 880                                 continue;
 881                         } else if (value[0] == 0) {
 882                                 /* check if string begins with double comma
 883                                    since that would mean the password really
 884                                    does start with a comma, and would not
 885                                    indicate an empty string */
 886                                 if (value[1] != separator[0]) {
 887                                         vol->password = NULL;
 888                                         continue;
 889                                 }
 890                         }
 891                         temp_len = strlen(value);
 892                         /* removed password length check, NTLM passwords
 893                                 can be arbitrarily long */
 894
 895                         /* if comma in password, the string will be
 896                         prematurely null terminated.  Commas in password are
 897                         specified across the cifs mount interface by a double
 898                         comma ie ,, and a comma used as in other cases ie ','
 899                         as a parameter delimiter/separator is single and due
 900                         to the strsep above is temporarily zeroed. */
 901
 902                         /* NB: password legally can have multiple commas and
 903                         the only illegal character in a password is null */
 904
 905                         if ((value[temp_len] == 0) &&
 906                             (value + temp_len < end) &&
 907                             (value[temp_len+1] == separator[0])) {
 908                                 /* reinsert comma */
 909                                 value[temp_len] = separator[0];
 910                                 temp_len += 2;  /* move after second comma */
 911                                 while (value[temp_len] != 0)  {
 912                                         if (value[temp_len] == separator[0]) {
 913                                                 if (value[temp_len+1] ==
 914                                                      separator[0]) {
 915                                                 /* skip second comma */
 916                                                         temp_len++;
 917                                                 } else {
 918                                                 /* single comma indicating start
 919                                                          of next parm */
 920                                                         break;
 921                                                 }
 922                                         }
 923                                         temp_len++;
 924                                 }
 925                                 if (value[temp_len] == 0) {
 926                                         options = NULL;
 927                                 } else {
 928                                         value[temp_len] = 0;
 929                                         /* point option to start of next parm */
 930                                         options = value + temp_len + 1;
 931                                 }
 932                                 /* go from value to value + temp_len condensing
 933                                 double commas to singles. Note that this ends up
 934                                 allocating a few bytes too many, which is ok */
 935                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 936                                 if (vol->password == NULL) {
 937                                         printk(KERN_WARNING "CIFS: no memory "
 938                                                             "for password\n");
 939                                         goto cifs_parse_mount_err;
 940                                 }
 941                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 942                                         vol->password[j] = value[i];
 943                                         if (value[i] == separator[0]
 944                                                 && value[i+1] == separator[0]) {
 945                                                 /* skip second comma */
 946                                                 i++;
 947                                         }
 948                                 }
 949                                 vol->password[j] = 0;
 950                         } else {
 951                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 952                                 if (vol->password == NULL) {
 953                                         printk(KERN_WARNING "CIFS: no memory "
 954                                                             "for password\n");
 955                                         goto cifs_parse_mount_err;
 956                                 }
 957                                 strcpy(vol->password, value);
 958                         }
 959                 } else if (!strnicmp(data, "ip", 2) ||
 960                            !strnicmp(data, "addr", 4)) {
 961                         if (!value || !*value) {
 962                                 vol->UNCip = NULL;
 963                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 964                                                         INET6_ADDRSTRLEN) {
 965                                 vol->UNCip = kstrdup(value, GFP_KERNEL);
 966                                 if (!vol->UNCip) {
 967                                         printk(KERN_WARNING "CIFS: no memory "
 968                                                             "for UNC IP\n");
 969                                         goto cifs_parse_mount_err;
 970                                 }
 971                         } else {
 972                                 printk(KERN_WARNING "CIFS: ip address "
 973                                                     "too long\n");
 974                                 goto cifs_parse_mount_err;
 975                         }
 976                 } else if (strnicmp(data, "sec", 3) == 0) {
 977                         if (!value || !*value) {
 978                                 cERROR(1, "no security value specified");
 979                                 continue;
 980                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 981                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 982                                         CIFSSEC_MUST_SIGN;
 983                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 984                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 985                                         CIFSSEC_MAY_KRB5; */
 986                                 cERROR(1, "Krb5 cifs privacy not supported");
 987                                 goto cifs_parse_mount_err;
 988                         } else if (strnicmp(value, "krb5", 4) == 0) {
 989                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 990                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 991                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 992                                         CIFSSEC_MUST_SIGN;
 993                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 994                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 995                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 996                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 997                                         CIFSSEC_MUST_SIGN;
 998                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 999                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1000                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
1001                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
1002                                         CIFSSEC_MUST_SIGN;
1003                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1004                                 /* ntlm is default so can be turned off too */
1005                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1006                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1007                                 /* BB is there a better way to do this? */
1008                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1009 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1010                         } else if (strnicmp(value, "lanman", 6) == 0) {
1011                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1012 #endif
1013                         } else if (strnicmp(value, "none", 4) == 0) {
1014                                 vol->nullauth = 1;
1015                         } else {
1016                                 cERROR(1, "bad security option: %s", value);
1017                                 goto cifs_parse_mount_err;
1018                         }
1019                 } else if (strnicmp(data, "vers", 3) == 0) {
1020                         if (!value || !*value) {
1021                                 cERROR(1, "no protocol version specified"
1022                                           " after vers= mount option");
1023                         } else if ((strnicmp(value, "cifs", 4) == 0) ||
1024                                    (strnicmp(value, "1", 1) == 0)) {
1025                                 /* this is the default */
1026                                 continue;
1027                         }
1028                 } else if ((strnicmp(data, "unc", 3) == 0)
1029                            || (strnicmp(data, "target", 6) == 0)
1030                            || (strnicmp(data, "path", 4) == 0)) {
1031                         if (!value || !*value) {
1032                                 printk(KERN_WARNING "CIFS: invalid path to "
1033                                                     "network resource\n");
1034                                 goto cifs_parse_mount_err;
1035                         }
1036                         if ((temp_len = strnlen(value, 300)) < 300) {
1037                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1038                                 if (vol->UNC == NULL)
1039                                         goto cifs_parse_mount_err;
1040                                 strcpy(vol->UNC, value);
1041                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1042                                         vol->UNC[0] = '\\';
1043                                         vol->UNC[1] = '\\';
1044                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1045                                         printk(KERN_WARNING
1046                                                "CIFS: UNC Path does not begin "
1047                                                "with // or \\\\ \n");
1048                                         goto cifs_parse_mount_err;
1049                                 }
1050                         } else {
1051                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1052                                 goto cifs_parse_mount_err;
1053                         }
1054                 } else if ((strnicmp(data, "domain", 3) == 0)
1055                            || (strnicmp(data, "workgroup", 5) == 0)) {
1056                         if (!value || !*value) {
1057                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1058                                 goto cifs_parse_mount_err;
1059                         }
1060                         /* BB are there cases in which a comma can be valid in
1061                         a domain name and need special handling? */
1062                         if (strnlen(value, 256) < 256) {
1063                                 vol->domainname = kstrdup(value, GFP_KERNEL);
1064                                 if (!vol->domainname) {
1065                                         printk(KERN_WARNING "CIFS: no memory "
1066                                                             "for domainname\n");
1067                                         goto cifs_parse_mount_err;
1068                                 }
1069                                 cFYI(1, "Domain name set");
1070                         } else {
1071                                 printk(KERN_WARNING "CIFS: domain name too "
1072                                                     "long\n");
1073                                 goto cifs_parse_mount_err;
1074                         }
1075                 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1076                         vol->srcaddr.ss_family = AF_UNSPEC;
1077
1078                         if (!value || !*value) {
1079                                 printk(KERN_WARNING "CIFS: srcaddr value"
1080                                        " not specified.\n");
1081                                 goto cifs_parse_mount_err;
1082                         }
1083                         i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1084                                                  value, strlen(value));
1085                         if (i == 0) {
1086                                 printk(KERN_WARNING "CIFS:  Could not parse"
1087                                        " srcaddr: %s\n",
1088                                        value);
1089                                 goto cifs_parse_mount_err;
1090                         }
1091                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1092                         if (!value || !*value) {
1093                                 printk(KERN_WARNING
1094                                         "CIFS: invalid path prefix\n");
1095                                 goto cifs_parse_mount_err;
1096                         }
1097                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1098                                 if (value[0] != '/')
1099                                         temp_len++;  /* missing leading slash */
1100                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1101                                 if (vol->prepath == NULL)
1102                                         goto cifs_parse_mount_err;
1103                                 if (value[0] != '/') {
1104                                         vol->prepath[0] = '/';
1105                                         strcpy(vol->prepath+1, value);
1106                                 } else
1107                                         strcpy(vol->prepath, value);
1108                                 cFYI(1, "prefix path %s", vol->prepath);
1109                         } else {
1110                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1111                                 goto cifs_parse_mount_err;
1112                         }
1113                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1114                         if (!value || !*value) {
1115                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1116                                                     "specified\n");
1117                                 goto cifs_parse_mount_err;
1118                         }
1119                         if (strnlen(value, 65) < 65) {
1120                                 if (strnicmp(value, "default", 7)) {
1121                                         vol->iocharset = kstrdup(value,
1122                                                                  GFP_KERNEL);
1123
1124                                         if (!vol->iocharset) {
1125                                                 printk(KERN_WARNING "CIFS: no "
1126                                                                    "memory for"
1127                                                                    "charset\n");
1128                                                 goto cifs_parse_mount_err;
1129                                         }
1130                                 }
1131                                 /* if iocharset not set then load_nls_default
1132                                    is used by caller */
1133                                 cFYI(1, "iocharset set to %s", value);
1134                         } else {
1135                                 printk(KERN_WARNING "CIFS: iocharset name "
1136                                                     "too long.\n");
1137                                 goto cifs_parse_mount_err;
1138                         }
1139                 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1140                         vol->linux_uid = simple_strtoul(value, &value, 0);
1141                         uid_specified = true;
1142                 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1143                         vol->cred_uid = simple_strtoul(value, &value, 0);
1144                 } else if (!strnicmp(data, "forceuid", 8)) {
1145                         override_uid = 1;
1146                 } else if (!strnicmp(data, "noforceuid", 10)) {
1147                         override_uid = 0;
1148                 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1149                         vol->linux_gid = simple_strtoul(value, &value, 0);
1150                         gid_specified = true;
1151                 } else if (!strnicmp(data, "forcegid", 8)) {
1152                         override_gid = 1;
1153                 } else if (!strnicmp(data, "noforcegid", 10)) {
1154                         override_gid = 0;
1155                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1156                         if (value && *value) {
1157                                 vol->file_mode =
1158                                         simple_strtoul(value, &value, 0);
1159                         }
1160                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1161                         if (value && *value) {
1162                                 vol->dir_mode =
1163                                         simple_strtoul(value, &value, 0);
1164                         }
1165                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1166                         if (value && *value) {
1167                                 vol->dir_mode =
1168                                         simple_strtoul(value, &value, 0);
1169                         }
1170                 } else if (strnicmp(data, "port", 4) == 0) {
1171                         if (value && *value) {
1172                                 vol->port =
1173                                         simple_strtoul(value, &value, 0);
1174                         }
1175                 } else if (strnicmp(data, "rsize", 5) == 0) {
1176                         if (value && *value) {
1177                                 vol->rsize =
1178                                         simple_strtoul(value, &value, 0);
1179                         }
1180                 } else if (strnicmp(data, "wsize", 5) == 0) {
1181                         if (value && *value) {
1182                                 vol->wsize =
1183                                         simple_strtoul(value, &value, 0);
1184                         }
1185                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1186                         if (!value || !*value) {
1187                                 cERROR(1, "no socket option specified");
1188                                 continue;
1189                         } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1190                                 vol->sockopt_tcp_nodelay = 1;
1191                         }
1192                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1193                         if (!value || !*value || (*value == ' ')) {
1194                                 cFYI(1, "invalid (empty) netbiosname");
1195                         } else {
1196                                 memset(vol->source_rfc1001_name, 0x20,
1197                                         RFC1001_NAME_LEN);
1198                                 /*
1199                                  * FIXME: are there cases in which a comma can
1200                                  * be valid in workstation netbios name (and
1201                                  * need special handling)?
1202                                  */
1203                                 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1204                                         /* don't ucase netbiosname for user */
1205                                         if (value[i] == 0)
1206                                                 break;
1207                                         vol->source_rfc1001_name[i] = value[i];
1208                                 }
1209                                 /* The string has 16th byte zero still from
1210                                 set at top of the function  */
1211                                 if (i == RFC1001_NAME_LEN && value[i] != 0)
1212                                         printk(KERN_WARNING "CIFS: netbiosname"
1213                                                 " longer than 15 truncated.\n");
1214                         }
1215                 } else if (strnicmp(data, "servern", 7) == 0) {
1216                         /* servernetbiosname specified override *SMBSERVER */
1217                         if (!value || !*value || (*value == ' ')) {
1218                                 cFYI(1, "empty server netbiosname specified");
1219                         } else {
1220                                 /* last byte, type, is 0x20 for servr type */
1221                                 memset(vol->target_rfc1001_name, 0x20,
1222                                         RFC1001_NAME_LEN_WITH_NULL);
1223
1224                                 for (i = 0; i < 15; i++) {
1225                                 /* BB are there cases in which a comma can be
1226                                    valid in this workstation netbios name
1227                                    (and need special handling)? */
1228
1229                                 /* user or mount helper must uppercase
1230                                    the netbiosname */
1231                                         if (value[i] == 0)
1232                                                 break;
1233                                         else
1234                                                 vol->target_rfc1001_name[i] =
1235                                                                 value[i];
1236                                 }
1237                                 /* The string has 16th byte zero still from
1238                                    set at top of the function  */
1239                                 if (i == RFC1001_NAME_LEN && value[i] != 0)
1240                                         printk(KERN_WARNING "CIFS: server net"
1241                                         "biosname longer than 15 truncated.\n");
1242                         }
1243                 } else if (strnicmp(data, "actimeo", 7) == 0) {
1244                         if (value && *value) {
1245                                 vol->actimeo = HZ * simple_strtoul(value,
1246                                                                    &value, 0);
1247                                 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1248                                         cERROR(1, "CIFS: attribute cache"
1249                                                         "timeout too large");
1250                                         goto cifs_parse_mount_err;
1251                                 }
1252                         }
1253                 } else if (strnicmp(data, "credentials", 4) == 0) {
1254                         /* ignore */
1255                 } else if (strnicmp(data, "version", 3) == 0) {
1256                         /* ignore */
1257                 } else if (strnicmp(data, "guest", 5) == 0) {
1258                         /* ignore */
1259                 } else if (strnicmp(data, "rw", 2) == 0) {
1260                         /* ignore */
1261                 } else if (strnicmp(data, "ro", 2) == 0) {
1262                         /* ignore */
1263                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1264                         vol->noblocksnd = 1;
1265                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1266                         vol->noautotune = 1;
1267                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1268                                    (strnicmp(data, "nosuid", 6) == 0) ||
1269                                    (strnicmp(data, "exec", 4) == 0) ||
1270                                    (strnicmp(data, "noexec", 6) == 0) ||
1271                                    (strnicmp(data, "nodev", 5) == 0) ||
1272                                    (strnicmp(data, "noauto", 6) == 0) ||
1273                                    (strnicmp(data, "dev", 3) == 0)) {
1274                         /*  The mount tool or mount.cifs helper (if present)
1275                             uses these opts to set flags, and the flags are read
1276                             by the kernel vfs layer before we get here (ie
1277                             before read super) so there is no point trying to
1278                             parse these options again and set anything and it
1279                             is ok to just ignore them */
1280                         continue;
1281                 } else if (strnicmp(data, "hard", 4) == 0) {
1282                         vol->retry = 1;
1283                 } else if (strnicmp(data, "soft", 4) == 0) {
1284                         vol->retry = 0;
1285                 } else if (strnicmp(data, "perm", 4) == 0) {
1286                         vol->noperm = 0;
1287                 } else if (strnicmp(data, "noperm", 6) == 0) {
1288                         vol->noperm = 1;
1289                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1290                         vol->remap = 1;
1291                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1292                         vol->remap = 0;
1293                 } else if (strnicmp(data, "sfu", 3) == 0) {
1294                         vol->sfu_emul = 1;
1295                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1296                         vol->sfu_emul = 0;
1297                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1298                         vol->nodfs = 1;
1299                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1300                         vol->posix_paths = 1;
1301                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1302                         vol->posix_paths = 0;
1303                 } else if (strnicmp(data, "nounix", 6) == 0) {
1304                         vol->no_linux_ext = 1;
1305                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1306                         vol->no_linux_ext = 1;
1307                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1308                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1309                         vol->nocase = 1;
1310                 } else if (strnicmp(data, "mand", 4) == 0) {
1311                         /* ignore */
1312                 } else if (strnicmp(data, "nomand", 6) == 0) {
1313                         /* ignore */
1314                 } else if (strnicmp(data, "_netdev", 7) == 0) {
1315                         /* ignore */
1316                 } else if (strnicmp(data, "brl", 3) == 0) {
1317                         vol->nobrl =  0;
1318                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1319                            (strnicmp(data, "nolock", 6) == 0)) {
1320                         vol->nobrl =  1;
1321                         /* turn off mandatory locking in mode
1322                         if remote locking is turned off since the
1323                         local vfs will do advisory */
1324                         if (vol->file_mode ==
1325                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1326                                 vol->file_mode = S_IALLUGO;
1327                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1328                         /* will take the shorter form "forcemand" as well */
1329                         /* This mount option will force use of mandatory
1330                           (DOS/Windows style) byte range locks, instead of
1331                           using posix advisory byte range locks, even if the
1332                           Unix extensions are available and posix locks would
1333                           be supported otherwise. If Unix extensions are not
1334                           negotiated this has no effect since mandatory locks
1335                           would be used (mandatory locks is all that those
1336                           those servers support) */
1337                         vol->mand_lock = 1;
1338                 } else if (strnicmp(data, "setuids", 7) == 0) {
1339                         vol->setuids = 1;
1340                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1341                         vol->setuids = 0;
1342                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1343                         vol->dynperm = true;
1344                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1345                         vol->dynperm = false;
1346                 } else if (strnicmp(data, "nohard", 6) == 0) {
1347                         vol->retry = 0;
1348                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1349                         vol->retry = 1;
1350                 } else if (strnicmp(data, "nointr", 6) == 0) {
1351                         vol->intr = 0;
1352                 } else if (strnicmp(data, "intr", 4) == 0) {
1353                         vol->intr = 1;
1354                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1355                         vol->nostrictsync = 1;
1356                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1357                         vol->nostrictsync = 0;
1358                 } else if (strnicmp(data, "serverino", 7) == 0) {
1359                         vol->server_ino = 1;
1360                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1361                         vol->server_ino = 0;
1362                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1363                         vol->cifs_acl = 1;
1364                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1365                         vol->cifs_acl = 0;
1366                 } else if (strnicmp(data, "acl", 3) == 0) {
1367                         vol->no_psx_acl = 0;
1368                 } else if (strnicmp(data, "noacl", 5) == 0) {
1369                         vol->no_psx_acl = 1;
1370                 } else if (strnicmp(data, "locallease", 6) == 0) {
1371                         vol->local_lease = 1;
1372                 } else if (strnicmp(data, "sign", 4) == 0) {
1373                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1374                 } else if (strnicmp(data, "seal", 4) == 0) {
1375                         /* we do not do the following in secFlags because seal
1376                            is a per tree connection (mount) not a per socket
1377                            or per-smb connection option in the protocol */
1378                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1379                         vol->seal = 1;
1380                 } else if (strnicmp(data, "direct", 6) == 0) {
1381                         vol->direct_io = 1;
1382                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1383                         vol->direct_io = 1;
1384                 } else if (strnicmp(data, "strictcache", 11) == 0) {
1385                         vol->strict_io = 1;
1386                 } else if (strnicmp(data, "noac", 4) == 0) {
1387                         printk(KERN_WARNING "CIFS: Mount option noac not "
1388                                 "supported. Instead set "
1389                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1390                 } else if (strnicmp(data, "fsc", 3) == 0) {
1391 #ifndef CONFIG_CIFS_FSCACHE
1392                         cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
1393                                   "kernel config option set");
1394                         goto cifs_parse_mount_err;
1395 #endif
1396                         vol->fsc = true;
1397                 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1398                         vol->mfsymlinks = true;
1399                 } else if (strnicmp(data, "multiuser", 8) == 0) {
1400                         vol->multiuser = true;
1401                 } else
1402                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1403                                                 data);
1404         }
1405         if (vol->UNC == NULL) {
1406                 if (devname == NULL) {
1407                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1408                                                 "target\n");
1409                         goto cifs_parse_mount_err;
1410                 }
1411                 if ((temp_len = strnlen(devname, 300)) < 300) {
1412                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1413                         if (vol->UNC == NULL)
1414                                 goto cifs_parse_mount_err;
1415                         strcpy(vol->UNC, devname);
1416                         if (strncmp(vol->UNC, "//", 2) == 0) {
1417                                 vol->UNC[0] = '\\';
1418                                 vol->UNC[1] = '\\';
1419                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1420                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1421                                                     "begin with // or \\\\ \n");
1422                                 goto cifs_parse_mount_err;
1423                         }
1424                         value = strpbrk(vol->UNC+2, "/\\");
1425                         if (value)
1426                                 *value = '\\';
1427                 } else {
1428                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1429                         goto cifs_parse_mount_err;
1430                 }
1431         }
1432
1433         if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1434                 cERROR(1, "Multiuser mounts currently require krb5 "
1435                           "authentication!");
1436                 goto cifs_parse_mount_err;
1437         }
1438
1439         if (vol->UNCip == NULL)
1440                 vol->UNCip = &vol->UNC[2];
1441
1442         if (uid_specified)
1443                 vol->override_uid = override_uid;
1444         else if (override_uid == 1)
1445                 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1446                                    "specified with no uid= option.\n");
1447
1448         if (gid_specified)
1449                 vol->override_gid = override_gid;
1450         else if (override_gid == 1)
1451                 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1452                                    "specified with no gid= option.\n");
1453
1454         kfree(mountdata_copy);
1455         return 0;
1456
1457 cifs_parse_mount_err:
1458         kfree(mountdata_copy);
1459         return 1;
1460 }
1461
1462 /** Returns true if srcaddr isn't specified and rhs isn't
1463  * specified, or if srcaddr is specified and
1464  * matches the IP address of the rhs argument.
1465  */
1466 static bool
1467 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1468 {
1469         switch (srcaddr->sa_family) {
1470         case AF_UNSPEC:
1471                 return (rhs->sa_family == AF_UNSPEC);
1472         case AF_INET: {
1473                 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1474                 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1475                 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1476         }
1477         case AF_INET6: {
1478                 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1479                 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1480                 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1481         }
1482         default:
1483                 WARN_ON(1);
1484                 return false; /* don't expect to be here */
1485         }
1486 }
1487
1488 /*
1489  * If no port is specified in addr structure, we try to match with 445 port
1490  * and if it fails - with 139 ports. It should be called only if address
1491  * families of server and addr are equal.
1492  */
1493 static bool
1494 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1495 {
1496         __be16 port, *sport;
1497
1498         switch (addr->sa_family) {
1499         case AF_INET:
1500                 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1501                 port = ((struct sockaddr_in *) addr)->sin_port;
1502                 break;
1503         case AF_INET6:
1504                 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1505                 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1506                 break;
1507         default:
1508                 WARN_ON(1);
1509                 return false;
1510         }
1511
1512         if (!port) {
1513                 port = htons(CIFS_PORT);
1514                 if (port == *sport)
1515                         return true;
1516
1517                 port = htons(RFC1001_PORT);
1518         }
1519
1520         return port == *sport;
1521 }
1522
1523 static bool
1524 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1525               struct sockaddr *srcaddr)
1526 {
1527         switch (addr->sa_family) {
1528         case AF_INET: {
1529                 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1530                 struct sockaddr_in *srv_addr4 =
1531                                         (struct sockaddr_in *)&server->dstaddr;
1532
1533                 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1534                         return false;
1535                 break;
1536         }
1537         case AF_INET6: {
1538                 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1539                 struct sockaddr_in6 *srv_addr6 =
1540                                         (struct sockaddr_in6 *)&server->dstaddr;
1541
1542                 if (!ipv6_addr_equal(&addr6->sin6_addr,
1543                                      &srv_addr6->sin6_addr))
1544                         return false;
1545                 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1546                         return false;
1547                 break;
1548         }
1549         default:
1550                 WARN_ON(1);
1551                 return false; /* don't expect to be here */
1552         }
1553
1554         if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1555                 return false;
1556
1557         return true;
1558 }
1559
1560 static bool
1561 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1562 {
1563         unsigned int secFlags;
1564
1565         if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1566                 secFlags = vol->secFlg;
1567         else
1568                 secFlags = global_secflags | vol->secFlg;
1569
1570         switch (server->secType) {
1571         case LANMAN:
1572                 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1573                         return false;
1574                 break;
1575         case NTLMv2:
1576                 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1577                         return false;
1578                 break;
1579         case NTLM:
1580                 if (!(secFlags & CIFSSEC_MAY_NTLM))
1581                         return false;
1582                 break;
1583         case Kerberos:
1584                 if (!(secFlags & CIFSSEC_MAY_KRB5))
1585                         return false;
1586                 break;
1587         case RawNTLMSSP:
1588                 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1589                         return false;
1590                 break;
1591         default:
1592                 /* shouldn't happen */
1593                 return false;
1594         }
1595
1596         /* now check if signing mode is acceptable */
1597         if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1598             (server->secMode & SECMODE_SIGN_REQUIRED))
1599                         return false;
1600         else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1601                  (server->secMode &
1602                   (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1603                         return false;
1604
1605         return true;
1606 }
1607
1608 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1609                          struct smb_vol *vol)
1610 {
1611         if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1612                 return 0;
1613
1614         if (!match_address(server, addr,
1615                            (struct sockaddr *)&vol->srcaddr))
1616                 return 0;
1617
1618         if (!match_port(server, addr))
1619                 return 0;
1620
1621         if (!match_security(server, vol))
1622                 return 0;
1623
1624         return 1;
1625 }
1626
1627 static struct TCP_Server_Info *
1628 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1629 {
1630         struct TCP_Server_Info *server;
1631
1632         spin_lock(&cifs_tcp_ses_lock);
1633         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1634                 if (!match_server(server, addr, vol))
1635                         continue;
1636
1637                 ++server->srv_count;
1638                 spin_unlock(&cifs_tcp_ses_lock);
1639                 cFYI(1, "Existing tcp session with server found");
1640                 return server;
1641         }
1642         spin_unlock(&cifs_tcp_ses_lock);
1643         return NULL;
1644 }
1645
1646 static void
1647 cifs_put_tcp_session(struct TCP_Server_Info *server)
1648 {
1649         struct task_struct *task;
1650
1651         spin_lock(&cifs_tcp_ses_lock);
1652         if (--server->srv_count > 0) {
1653                 spin_unlock(&cifs_tcp_ses_lock);
1654                 return;
1655         }
1656
1657         put_net(cifs_net_ns(server));
1658
1659         list_del_init(&server->tcp_ses_list);
1660         spin_unlock(&cifs_tcp_ses_lock);
1661
1662         cancel_delayed_work_sync(&server->echo);
1663
1664         spin_lock(&GlobalMid_Lock);
1665         server->tcpStatus = CifsExiting;
1666         spin_unlock(&GlobalMid_Lock);
1667
1668         cifs_crypto_shash_release(server);
1669         cifs_fscache_release_client_cookie(server);
1670
1671         kfree(server->session_key.response);
1672         server->session_key.response = NULL;
1673         server->session_key.len = 0;
1674
1675         task = xchg(&server->tsk, NULL);
1676         if (task)
1677                 force_sig(SIGKILL, task);
1678 }
1679
1680 static struct TCP_Server_Info *
1681 cifs_get_tcp_session(struct smb_vol *volume_info)
1682 {
1683         struct TCP_Server_Info *tcp_ses = NULL;
1684         struct sockaddr_storage addr;
1685         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1686         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1687         int rc;
1688
1689         memset(&addr, 0, sizeof(struct sockaddr_storage));
1690
1691         cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1692
1693         if (volume_info->UNCip && volume_info->UNC) {
1694                 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1695                                         volume_info->UNCip,
1696                                         strlen(volume_info->UNCip),
1697                                         volume_info->port);
1698                 if (!rc) {
1699                         /* we failed translating address */
1700                         rc = -EINVAL;
1701                         goto out_err;
1702                 }
1703         } else if (volume_info->UNCip) {
1704                 /* BB using ip addr as tcp_ses name to connect to the
1705                    DFS root below */
1706                 cERROR(1, "Connecting to DFS root not implemented yet");
1707                 rc = -EINVAL;
1708                 goto out_err;
1709         } else /* which tcp_sess DFS root would we conect to */ {
1710                 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1711                         "unc=//192.168.1.100/public) specified");
1712                 rc = -EINVAL;
1713                 goto out_err;
1714         }
1715
1716         /* see if we already have a matching tcp_ses */
1717         tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1718         if (tcp_ses)
1719                 return tcp_ses;
1720
1721         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1722         if (!tcp_ses) {
1723                 rc = -ENOMEM;
1724                 goto out_err;
1725         }
1726
1727         rc = cifs_crypto_shash_allocate(tcp_ses);
1728         if (rc) {
1729                 cERROR(1, "could not setup hash structures rc %d", rc);
1730                 goto out_err;
1731         }
1732
1733         cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1734         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1735         if (IS_ERR(tcp_ses->hostname)) {
1736                 rc = PTR_ERR(tcp_ses->hostname);
1737                 goto out_err_crypto_release;
1738         }
1739
1740         tcp_ses->noblocksnd = volume_info->noblocksnd;
1741         tcp_ses->noautotune = volume_info->noautotune;
1742         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1743         atomic_set(&tcp_ses->inFlight, 0);
1744         init_waitqueue_head(&tcp_ses->response_q);
1745         init_waitqueue_head(&tcp_ses->request_q);
1746         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1747         mutex_init(&tcp_ses->srv_mutex);
1748         memcpy(tcp_ses->workstation_RFC1001_name,
1749                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1750         memcpy(tcp_ses->server_RFC1001_name,
1751                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1752         tcp_ses->session_estab = false;
1753         tcp_ses->sequence_number = 0;
1754         tcp_ses->lstrp = jiffies;
1755         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1756         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1757         INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1758
1759         /*
1760          * at this point we are the only ones with the pointer
1761          * to the struct since the kernel thread not created yet
1762          * no need to spinlock this init of tcpStatus or srv_count
1763          */
1764         tcp_ses->tcpStatus = CifsNew;
1765         memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1766                sizeof(tcp_ses->srcaddr));
1767         ++tcp_ses->srv_count;
1768
1769         if (addr.ss_family == AF_INET6) {
1770                 cFYI(1, "attempting ipv6 connect");
1771                 /* BB should we allow ipv6 on port 139? */
1772                 /* other OS never observed in Wild doing 139 with v6 */
1773                 memcpy(&tcp_ses->dstaddr, sin_server6,
1774                        sizeof(struct sockaddr_in6));
1775         } else
1776                 memcpy(&tcp_ses->dstaddr, sin_server,
1777                        sizeof(struct sockaddr_in));
1778
1779         rc = ip_connect(tcp_ses);
1780         if (rc < 0) {
1781                 cERROR(1, "Error connecting to socket. Aborting operation");
1782                 goto out_err_crypto_release;
1783         }
1784
1785         /*
1786          * since we're in a cifs function already, we know that
1787          * this will succeed. No need for try_module_get().
1788          */
1789         __module_get(THIS_MODULE);
1790         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1791                                   tcp_ses, "cifsd");
1792         if (IS_ERR(tcp_ses->tsk)) {
1793                 rc = PTR_ERR(tcp_ses->tsk);
1794                 cERROR(1, "error %d create cifsd thread", rc);
1795                 module_put(THIS_MODULE);
1796                 goto out_err_crypto_release;
1797         }
1798         tcp_ses->tcpStatus = CifsNeedNegotiate;
1799
1800         /* thread spawned, put it on the list */
1801         spin_lock(&cifs_tcp_ses_lock);
1802         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1803         spin_unlock(&cifs_tcp_ses_lock);
1804
1805         cifs_fscache_get_client_cookie(tcp_ses);
1806
1807         /* queue echo request delayed work */
1808         queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1809
1810         return tcp_ses;
1811
1812 out_err_crypto_release:
1813         cifs_crypto_shash_release(tcp_ses);
1814
1815         put_net(cifs_net_ns(tcp_ses));
1816
1817 out_err:
1818         if (tcp_ses) {
1819                 if (!IS_ERR(tcp_ses->hostname))
1820                         kfree(tcp_ses->hostname);
1821                 if (tcp_ses->ssocket)
1822                         sock_release(tcp_ses->ssocket);
1823                 kfree(tcp_ses);
1824         }
1825         return ERR_PTR(rc);
1826 }
1827
1828 static int match_session(struct cifsSesInfo *ses, struct smb_vol *vol)
1829 {
1830         switch (ses->server->secType) {
1831         case Kerberos:
1832                 if (vol->cred_uid != ses->cred_uid)
1833                         return 0;
1834                 break;
1835         default:
1836                 /* anything else takes username/password */
1837                 if (ses->user_name == NULL)
1838                         return 0;
1839                 if (strncmp(ses->user_name, vol->username,
1840                             MAX_USERNAME_SIZE))
1841                         return 0;
1842                 if (strlen(vol->username) != 0 &&
1843                     ses->password != NULL &&
1844                     strncmp(ses->password,
1845                             vol->password ? vol->password : "",
1846                             MAX_PASSWORD_SIZE))
1847                         return 0;
1848         }
1849         return 1;
1850 }
1851
1852 static struct cifsSesInfo *
1853 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1854 {
1855         struct cifsSesInfo *ses;
1856
1857         spin_lock(&cifs_tcp_ses_lock);
1858         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1859                 if (!match_session(ses, vol))
1860                         continue;
1861                 ++ses->ses_count;
1862                 spin_unlock(&cifs_tcp_ses_lock);
1863                 return ses;
1864         }
1865         spin_unlock(&cifs_tcp_ses_lock);
1866         return NULL;
1867 }
1868
1869 static void
1870 cifs_put_smb_ses(struct cifsSesInfo *ses)
1871 {
1872         int xid;
1873         struct TCP_Server_Info *server = ses->server;
1874
1875         cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1876         spin_lock(&cifs_tcp_ses_lock);
1877         if (--ses->ses_count > 0) {
1878                 spin_unlock(&cifs_tcp_ses_lock);
1879                 return;
1880         }
1881
1882         list_del_init(&ses->smb_ses_list);
1883         spin_unlock(&cifs_tcp_ses_lock);
1884
1885         if (ses->status == CifsGood) {
1886                 xid = GetXid();
1887                 CIFSSMBLogoff(xid, ses);
1888                 _FreeXid(xid);
1889         }
1890         sesInfoFree(ses);
1891         cifs_put_tcp_session(server);
1892 }
1893
1894 static bool warned_on_ntlm;  /* globals init to false automatically */
1895
1896 static struct cifsSesInfo *
1897 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1898 {
1899         int rc = -ENOMEM, xid;
1900         struct cifsSesInfo *ses;
1901         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1902         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1903
1904         xid = GetXid();
1905
1906         ses = cifs_find_smb_ses(server, volume_info);
1907         if (ses) {
1908                 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1909
1910                 mutex_lock(&ses->session_mutex);
1911                 rc = cifs_negotiate_protocol(xid, ses);
1912                 if (rc) {
1913                         mutex_unlock(&ses->session_mutex);
1914                         /* problem -- put our ses reference */
1915                         cifs_put_smb_ses(ses);
1916                         FreeXid(xid);
1917                         return ERR_PTR(rc);
1918                 }
1919                 if (ses->need_reconnect) {
1920                         cFYI(1, "Session needs reconnect");
1921                         rc = cifs_setup_session(xid, ses,
1922                                                 volume_info->local_nls);
1923                         if (rc) {
1924                                 mutex_unlock(&ses->session_mutex);
1925                                 /* problem -- put our reference */
1926                                 cifs_put_smb_ses(ses);
1927                                 FreeXid(xid);
1928                                 return ERR_PTR(rc);
1929                         }
1930                 }
1931                 mutex_unlock(&ses->session_mutex);
1932
1933                 /* existing SMB ses has a server reference already */
1934                 cifs_put_tcp_session(server);
1935                 FreeXid(xid);
1936                 return ses;
1937         }
1938
1939         cFYI(1, "Existing smb sess not found");
1940         ses = sesInfoAlloc();
1941         if (ses == NULL)
1942                 goto get_ses_fail;
1943
1944         /* new SMB session uses our server ref */
1945         ses->server = server;
1946         if (server->dstaddr.ss_family == AF_INET6)
1947                 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1948         else
1949                 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1950
1951         if (volume_info->username) {
1952                 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
1953                 if (!ses->user_name)
1954                         goto get_ses_fail;
1955         }
1956
1957         /* volume_info->password freed at unmount */
1958         if (volume_info->password) {
1959                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1960                 if (!ses->password)
1961                         goto get_ses_fail;
1962         }
1963         if (volume_info->domainname) {
1964                 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
1965                 if (!ses->domainName)
1966                         goto get_ses_fail;
1967         }
1968         ses->cred_uid = volume_info->cred_uid;
1969         ses->linux_uid = volume_info->linux_uid;
1970
1971         /* ntlmv2 is much stronger than ntlm security, and has been broadly
1972         supported for many years, time to update default security mechanism */
1973         if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
1974                 warned_on_ntlm = true;
1975                 cERROR(1, "default security mechanism requested.  The default "
1976                         "security mechanism will be upgraded from ntlm to "
1977                         "ntlmv2 in kernel release 2.6.41");
1978         }
1979         ses->overrideSecFlg = volume_info->secFlg;
1980
1981         mutex_lock(&ses->session_mutex);
1982         rc = cifs_negotiate_protocol(xid, ses);
1983         if (!rc)
1984                 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1985         mutex_unlock(&ses->session_mutex);
1986         if (rc)
1987                 goto get_ses_fail;
1988
1989         /* success, put it on the list */
1990         spin_lock(&cifs_tcp_ses_lock);
1991         list_add(&ses->smb_ses_list, &server->smb_ses_list);
1992         spin_unlock(&cifs_tcp_ses_lock);
1993
1994         FreeXid(xid);
1995         return ses;
1996
1997 get_ses_fail:
1998         sesInfoFree(ses);
1999         FreeXid(xid);
2000         return ERR_PTR(rc);
2001 }
2002
2003 static int match_tcon(struct cifsTconInfo *tcon, const char *unc)
2004 {
2005         if (tcon->tidStatus == CifsExiting)
2006                 return 0;
2007         if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2008                 return 0;
2009         return 1;
2010 }
2011
2012 static struct cifsTconInfo *
2013 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
2014 {
2015         struct list_head *tmp;
2016         struct cifsTconInfo *tcon;
2017
2018         spin_lock(&cifs_tcp_ses_lock);
2019         list_for_each(tmp, &ses->tcon_list) {
2020                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
2021                 if (!match_tcon(tcon, unc))
2022                         continue;
2023                 ++tcon->tc_count;
2024                 spin_unlock(&cifs_tcp_ses_lock);
2025                 return tcon;
2026         }
2027         spin_unlock(&cifs_tcp_ses_lock);
2028         return NULL;
2029 }
2030
2031 static void
2032 cifs_put_tcon(struct cifsTconInfo *tcon)
2033 {
2034         int xid;
2035         struct cifsSesInfo *ses = tcon->ses;
2036
2037         cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2038         spin_lock(&cifs_tcp_ses_lock);
2039         if (--tcon->tc_count > 0) {
2040                 spin_unlock(&cifs_tcp_ses_lock);
2041                 return;
2042         }
2043
2044         list_del_init(&tcon->tcon_list);
2045         spin_unlock(&cifs_tcp_ses_lock);
2046
2047         xid = GetXid();
2048         CIFSSMBTDis(xid, tcon);
2049         _FreeXid(xid);
2050
2051         cifs_fscache_release_super_cookie(tcon);
2052         tconInfoFree(tcon);
2053         cifs_put_smb_ses(ses);
2054 }
2055
2056 static struct cifsTconInfo *
2057 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
2058 {
2059         int rc, xid;
2060         struct cifsTconInfo *tcon;
2061
2062         tcon = cifs_find_tcon(ses, volume_info->UNC);
2063         if (tcon) {
2064                 cFYI(1, "Found match on UNC path");
2065                 /* existing tcon already has a reference */
2066                 cifs_put_smb_ses(ses);
2067                 if (tcon->seal != volume_info->seal)
2068                         cERROR(1, "transport encryption setting "
2069                                    "conflicts with existing tid");
2070                 return tcon;
2071         }
2072
2073         tcon = tconInfoAlloc();
2074         if (tcon == NULL) {
2075                 rc = -ENOMEM;
2076                 goto out_fail;
2077         }
2078
2079         tcon->ses = ses;
2080         if (volume_info->password) {
2081                 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2082                 if (!tcon->password) {
2083                         rc = -ENOMEM;
2084                         goto out_fail;
2085                 }
2086         }
2087
2088         if (strchr(volume_info->UNC + 3, '\\') == NULL
2089             && strchr(volume_info->UNC + 3, '/') == NULL) {
2090                 cERROR(1, "Missing share name");
2091                 rc = -ENODEV;
2092                 goto out_fail;
2093         }
2094
2095         /* BB Do we need to wrap session_mutex around
2096          * this TCon call and Unix SetFS as
2097          * we do on SessSetup and reconnect? */
2098         xid = GetXid();
2099         rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2100         FreeXid(xid);
2101         cFYI(1, "CIFS Tcon rc = %d", rc);
2102         if (rc)
2103                 goto out_fail;
2104
2105         if (volume_info->nodfs) {
2106                 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2107                 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2108         }
2109         tcon->seal = volume_info->seal;
2110         /* we can have only one retry value for a connection
2111            to a share so for resources mounted more than once
2112            to the same server share the last value passed in
2113            for the retry flag is used */
2114         tcon->retry = volume_info->retry;
2115         tcon->nocase = volume_info->nocase;
2116         tcon->local_lease = volume_info->local_lease;
2117
2118         spin_lock(&cifs_tcp_ses_lock);
2119         list_add(&tcon->tcon_list, &ses->tcon_list);
2120         spin_unlock(&cifs_tcp_ses_lock);
2121
2122         cifs_fscache_get_super_cookie(tcon);
2123
2124         return tcon;
2125
2126 out_fail:
2127         tconInfoFree(tcon);
2128         return ERR_PTR(rc);
2129 }
2130
2131 void
2132 cifs_put_tlink(struct tcon_link *tlink)
2133 {
2134         if (!tlink || IS_ERR(tlink))
2135                 return;
2136
2137         if (!atomic_dec_and_test(&tlink->tl_count) ||
2138             test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2139                 tlink->tl_time = jiffies;
2140                 return;
2141         }
2142
2143         if (!IS_ERR(tlink_tcon(tlink)))
2144                 cifs_put_tcon(tlink_tcon(tlink));
2145         kfree(tlink);
2146         return;
2147 }
2148
2149 int
2150 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
2151              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2152              struct dfs_info3_param **preferrals, int remap)
2153 {
2154         char *temp_unc;
2155         int rc = 0;
2156
2157         *pnum_referrals = 0;
2158         *preferrals = NULL;
2159
2160         if (pSesInfo->ipc_tid == 0) {
2161                 temp_unc = kmalloc(2 /* for slashes */ +
2162                         strnlen(pSesInfo->serverName,
2163                                 SERVER_NAME_LEN_WITH_NULL * 2)
2164                                  + 1 + 4 /* slash IPC$ */  + 2,
2165                                 GFP_KERNEL);
2166                 if (temp_unc == NULL)
2167                         return -ENOMEM;
2168                 temp_unc[0] = '\\';
2169                 temp_unc[1] = '\\';
2170                 strcpy(temp_unc + 2, pSesInfo->serverName);
2171                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2172                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2173                 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2174                 kfree(temp_unc);
2175         }
2176         if (rc == 0)
2177                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2178                                      pnum_referrals, nls_codepage, remap);
2179         /* BB map targetUNCs to dfs_info3 structures, here or
2180                 in CIFSGetDFSRefer BB */
2181
2182         return rc;
2183 }
2184
2185 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2186 static struct lock_class_key cifs_key[2];
2187 static struct lock_class_key cifs_slock_key[2];
2188
2189 static inline void
2190 cifs_reclassify_socket4(struct socket *sock)
2191 {
2192         struct sock *sk = sock->sk;
2193         BUG_ON(sock_owned_by_user(sk));
2194         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2195                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2196 }
2197
2198 static inline void
2199 cifs_reclassify_socket6(struct socket *sock)
2200 {
2201         struct sock *sk = sock->sk;
2202         BUG_ON(sock_owned_by_user(sk));
2203         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2204                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2205 }
2206 #else
2207 static inline void
2208 cifs_reclassify_socket4(struct socket *sock)
2209 {
2210 }
2211
2212 static inline void
2213 cifs_reclassify_socket6(struct socket *sock)
2214 {
2215 }
2216 #endif
2217
2218 /* See RFC1001 section 14 on representation of Netbios names */
2219 static void rfc1002mangle(char *target, char *source, unsigned int length)
2220 {
2221         unsigned int i, j;
2222
2223         for (i = 0, j = 0; i < (length); i++) {
2224                 /* mask a nibble at a time and encode */
2225                 target[j] = 'A' + (0x0F & (source[i] >> 4));
2226                 target[j+1] = 'A' + (0x0F & source[i]);
2227                 j += 2;
2228         }
2229
2230 }
2231
2232 static int
2233 bind_socket(struct TCP_Server_Info *server)
2234 {
2235         int rc = 0;
2236         if (server->srcaddr.ss_family != AF_UNSPEC) {
2237                 /* Bind to the specified local IP address */
2238                 struct socket *socket = server->ssocket;
2239                 rc = socket->ops->bind(socket,
2240                                        (struct sockaddr *) &server->srcaddr,
2241                                        sizeof(server->srcaddr));
2242                 if (rc < 0) {
2243                         struct sockaddr_in *saddr4;
2244                         struct sockaddr_in6 *saddr6;
2245                         saddr4 = (struct sockaddr_in *)&server->srcaddr;
2246                         saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2247                         if (saddr6->sin6_family == AF_INET6)
2248                                 cERROR(1, "cifs: "
2249                                        "Failed to bind to: %pI6c, error: %d\n",
2250                                        &saddr6->sin6_addr, rc);
2251                         else
2252                                 cERROR(1, "cifs: "
2253                                        "Failed to bind to: %pI4, error: %d\n",
2254                                        &saddr4->sin_addr.s_addr, rc);
2255                 }
2256         }
2257         return rc;
2258 }
2259
2260 static int
2261 ip_rfc1001_connect(struct TCP_Server_Info *server)
2262 {
2263         int rc = 0;
2264         /*
2265          * some servers require RFC1001 sessinit before sending
2266          * negprot - BB check reconnection in case where second
2267          * sessinit is sent but no second negprot
2268          */
2269         struct rfc1002_session_packet *ses_init_buf;
2270         struct smb_hdr *smb_buf;
2271         ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2272                                GFP_KERNEL);
2273         if (ses_init_buf) {
2274                 ses_init_buf->trailer.session_req.called_len = 32;
2275
2276                 if (server->server_RFC1001_name &&
2277                     server->server_RFC1001_name[0] != 0)
2278                         rfc1002mangle(ses_init_buf->trailer.
2279                                       session_req.called_name,
2280                                       server->server_RFC1001_name,
2281                                       RFC1001_NAME_LEN_WITH_NULL);
2282                 else
2283                         rfc1002mangle(ses_init_buf->trailer.
2284                                       session_req.called_name,
2285                                       DEFAULT_CIFS_CALLED_NAME,
2286                                       RFC1001_NAME_LEN_WITH_NULL);
2287
2288                 ses_init_buf->trailer.session_req.calling_len = 32;
2289
2290                 /*
2291                  * calling name ends in null (byte 16) from old smb
2292                  * convention.
2293                  */
2294                 if (server->workstation_RFC1001_name &&
2295                     server->workstation_RFC1001_name[0] != 0)
2296                         rfc1002mangle(ses_init_buf->trailer.
2297                                       session_req.calling_name,
2298                                       server->workstation_RFC1001_name,
2299                                       RFC1001_NAME_LEN_WITH_NULL);
2300                 else
2301                         rfc1002mangle(ses_init_buf->trailer.
2302                                       session_req.calling_name,
2303                                       "LINUX_CIFS_CLNT",
2304                                       RFC1001_NAME_LEN_WITH_NULL);
2305
2306                 ses_init_buf->trailer.session_req.scope1 = 0;
2307                 ses_init_buf->trailer.session_req.scope2 = 0;
2308                 smb_buf = (struct smb_hdr *)ses_init_buf;
2309
2310                 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2311                 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2312                 rc = smb_send(server, smb_buf, 0x44);
2313                 kfree(ses_init_buf);
2314                 /*
2315                  * RFC1001 layer in at least one server
2316                  * requires very short break before negprot
2317                  * presumably because not expecting negprot
2318                  * to follow so fast.  This is a simple
2319                  * solution that works without
2320                  * complicating the code and causes no
2321                  * significant slowing down on mount
2322                  * for everyone else
2323                  */
2324                 usleep_range(1000, 2000);
2325         }
2326         /*
2327          * else the negprot may still work without this
2328          * even though malloc failed
2329          */
2330
2331         return rc;
2332 }
2333
2334 static int
2335 generic_ip_connect(struct TCP_Server_Info *server)
2336 {
2337         int rc = 0;
2338         __be16 sport;
2339         int slen, sfamily;
2340         struct socket *socket = server->ssocket;
2341         struct sockaddr *saddr;
2342
2343         saddr = (struct sockaddr *) &server->dstaddr;
2344
2345         if (server->dstaddr.ss_family == AF_INET6) {
2346                 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2347                 slen = sizeof(struct sockaddr_in6);
2348                 sfamily = AF_INET6;
2349         } else {
2350                 sport = ((struct sockaddr_in *) saddr)->sin_port;
2351                 slen = sizeof(struct sockaddr_in);
2352                 sfamily = AF_INET;
2353         }
2354
2355         if (socket == NULL) {
2356                 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2357                                    IPPROTO_TCP, &socket, 1);
2358                 if (rc < 0) {
2359                         cERROR(1, "Error %d creating socket", rc);
2360                         server->ssocket = NULL;
2361                         return rc;
2362                 }
2363
2364                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2365                 cFYI(1, "Socket created");
2366                 server->ssocket = socket;
2367                 socket->sk->sk_allocation = GFP_NOFS;
2368                 if (sfamily == AF_INET6)
2369                         cifs_reclassify_socket6(socket);
2370                 else
2371                         cifs_reclassify_socket4(socket);
2372         }
2373
2374         rc = bind_socket(server);
2375         if (rc < 0)
2376                 return rc;
2377
2378         rc = socket->ops->connect(socket, saddr, slen, 0);
2379         if (rc < 0) {
2380                 cFYI(1, "Error %d connecting to server", rc);
2381                 sock_release(socket);
2382                 server->ssocket = NULL;
2383                 return rc;
2384         }
2385
2386         /*
2387          * Eventually check for other socket options to change from
2388          * the default. sock_setsockopt not used because it expects
2389          * user space buffer
2390          */
2391         socket->sk->sk_rcvtimeo = 7 * HZ;
2392         socket->sk->sk_sndtimeo = 5 * HZ;
2393
2394         /* make the bufsizes depend on wsize/rsize and max requests */
2395         if (server->noautotune) {
2396                 if (socket->sk->sk_sndbuf < (200 * 1024))
2397                         socket->sk->sk_sndbuf = 200 * 1024;
2398                 if (socket->sk->sk_rcvbuf < (140 * 1024))
2399                         socket->sk->sk_rcvbuf = 140 * 1024;
2400         }
2401
2402         if (server->tcp_nodelay) {
2403                 int val = 1;
2404                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2405                                 (char *)&val, sizeof(val));
2406                 if (rc)
2407                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2408         }
2409
2410          cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2411                  socket->sk->sk_sndbuf,
2412                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2413
2414         if (sport == htons(RFC1001_PORT))
2415                 rc = ip_rfc1001_connect(server);
2416
2417         return rc;
2418 }
2419
2420 static int
2421 ip_connect(struct TCP_Server_Info *server)
2422 {
2423         __be16 *sport;
2424         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2425         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2426
2427         if (server->dstaddr.ss_family == AF_INET6)
2428                 sport = &addr6->sin6_port;
2429         else
2430                 sport = &addr->sin_port;
2431
2432         if (*sport == 0) {
2433                 int rc;
2434
2435                 /* try with 445 port at first */
2436                 *sport = htons(CIFS_PORT);
2437
2438                 rc = generic_ip_connect(server);
2439                 if (rc >= 0)
2440                         return rc;
2441
2442                 /* if it failed, try with 139 port */
2443                 *sport = htons(RFC1001_PORT);
2444         }
2445
2446         return generic_ip_connect(server);
2447 }
2448
2449 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2450                           struct super_block *sb, struct smb_vol *vol_info)
2451 {
2452         /* if we are reconnecting then should we check to see if
2453          * any requested capabilities changed locally e.g. via
2454          * remount but we can not do much about it here
2455          * if they have (even if we could detect it by the following)
2456          * Perhaps we could add a backpointer to array of sb from tcon
2457          * or if we change to make all sb to same share the same
2458          * sb as NFS - then we only have one backpointer to sb.
2459          * What if we wanted to mount the server share twice once with
2460          * and once without posixacls or posix paths? */
2461         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2462
2463         if (vol_info && vol_info->no_linux_ext) {
2464                 tcon->fsUnixInfo.Capability = 0;
2465                 tcon->unix_ext = 0; /* Unix Extensions disabled */
2466                 cFYI(1, "Linux protocol extensions disabled");
2467                 return;
2468         } else if (vol_info)
2469                 tcon->unix_ext = 1; /* Unix Extensions supported */
2470
2471         if (tcon->unix_ext == 0) {
2472                 cFYI(1, "Unix extensions disabled so not set on reconnect");
2473                 return;
2474         }
2475
2476         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2477                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2478                 cFYI(1, "unix caps which server supports %lld", cap);
2479                 /* check for reconnect case in which we do not
2480                    want to change the mount behavior if we can avoid it */
2481                 if (vol_info == NULL) {
2482                         /* turn off POSIX ACL and PATHNAMES if not set
2483                            originally at mount time */
2484                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2485                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2486                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2487                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2488                                         cERROR(1, "POSIXPATH support change");
2489                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2490                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2491                                 cERROR(1, "possible reconnect error");
2492                                 cERROR(1, "server disabled POSIX path support");
2493                         }
2494                 }
2495
2496                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2497                         cERROR(1, "per-share encryption not supported yet");
2498
2499                 cap &= CIFS_UNIX_CAP_MASK;
2500                 if (vol_info && vol_info->no_psx_acl)
2501                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2502                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2503                         cFYI(1, "negotiated posix acl support");
2504                         if (sb)
2505                                 sb->s_flags |= MS_POSIXACL;
2506                 }
2507
2508                 if (vol_info && vol_info->posix_paths == 0)
2509                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2510                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2511                         cFYI(1, "negotiate posix pathnames");
2512                         if (sb)
2513                                 CIFS_SB(sb)->mnt_cifs_flags |=
2514                                         CIFS_MOUNT_POSIX_PATHS;
2515                 }
2516
2517                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2518                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2519                                 CIFS_SB(sb)->rsize = 127 * 1024;
2520                                 cFYI(DBG2, "larger reads not supported by srv");
2521                         }
2522                 }
2523
2524
2525                 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2526 #ifdef CONFIG_CIFS_DEBUG2
2527                 if (cap & CIFS_UNIX_FCNTL_CAP)
2528                         cFYI(1, "FCNTL cap");
2529                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2530                         cFYI(1, "EXTATTR cap");
2531                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2532                         cFYI(1, "POSIX path cap");
2533                 if (cap & CIFS_UNIX_XATTR_CAP)
2534                         cFYI(1, "XATTR cap");
2535                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2536                         cFYI(1, "POSIX ACL cap");
2537                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2538                         cFYI(1, "very large read cap");
2539                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2540                         cFYI(1, "very large write cap");
2541                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2542                         cFYI(1, "transport encryption cap");
2543                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2544                         cFYI(1, "mandatory transport encryption cap");
2545 #endif /* CIFS_DEBUG2 */
2546                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2547                         if (vol_info == NULL) {
2548                                 cFYI(1, "resetting capabilities failed");
2549                         } else
2550                                 cERROR(1, "Negotiating Unix capabilities "
2551                                            "with the server failed.  Consider "
2552                                            "mounting with the Unix Extensions\n"
2553                                            "disabled, if problems are found, "
2554                                            "by specifying the nounix mount "
2555                                            "option.");
2556
2557                 }
2558         }
2559 }
2560
2561 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2562                         struct cifs_sb_info *cifs_sb)
2563 {
2564         INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2565
2566         if (pvolume_info->rsize > CIFSMaxBufSize) {
2567                 cERROR(1, "rsize %d too large, using MaxBufSize",
2568                         pvolume_info->rsize);
2569                 cifs_sb->rsize = CIFSMaxBufSize;
2570         } else if ((pvolume_info->rsize) &&
2571                         (pvolume_info->rsize <= CIFSMaxBufSize))
2572                 cifs_sb->rsize = pvolume_info->rsize;
2573         else /* default */
2574                 cifs_sb->rsize = CIFSMaxBufSize;
2575
2576         if (cifs_sb->rsize < 2048) {
2577                 cifs_sb->rsize = 2048;
2578                 /* Windows ME may prefer this */
2579                 cFYI(1, "readsize set to minimum: 2048");
2580         }
2581         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2582         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2583         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2584         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2585         cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
2586                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2587
2588         cifs_sb->actimeo = pvolume_info->actimeo;
2589         cifs_sb->local_nls = pvolume_info->local_nls;
2590
2591         if (pvolume_info->noperm)
2592                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2593         if (pvolume_info->setuids)
2594                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2595         if (pvolume_info->server_ino)
2596                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2597         if (pvolume_info->remap)
2598                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2599         if (pvolume_info->no_xattr)
2600                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2601         if (pvolume_info->sfu_emul)
2602                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2603         if (pvolume_info->nobrl)
2604                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2605         if (pvolume_info->nostrictsync)
2606                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2607         if (pvolume_info->mand_lock)
2608                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2609         if (pvolume_info->cifs_acl)
2610                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2611         if (pvolume_info->override_uid)
2612                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2613         if (pvolume_info->override_gid)
2614                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2615         if (pvolume_info->dynperm)
2616                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2617         if (pvolume_info->fsc)
2618                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2619         if (pvolume_info->multiuser)
2620                 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2621                                             CIFS_MOUNT_NO_PERM);
2622         if (pvolume_info->strict_io)
2623                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2624         if (pvolume_info->direct_io) {
2625                 cFYI(1, "mounting share using direct i/o");
2626                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2627         }
2628         if (pvolume_info->mfsymlinks) {
2629                 if (pvolume_info->sfu_emul) {
2630                         cERROR(1,  "mount option mfsymlinks ignored if sfu "
2631                                    "mount option is used");
2632                 } else {
2633                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2634                 }
2635         }
2636
2637         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2638                 cERROR(1, "mount option dynperm ignored if cifsacl "
2639                            "mount option supported");
2640 }
2641
2642 /*
2643  * When the server supports very large writes via POSIX extensions, we can
2644  * allow up to 2^24 - PAGE_CACHE_SIZE.
2645  *
2646  * Note that this might make for "interesting" allocation problems during
2647  * writeback however (as we have to allocate an array of pointers for the
2648  * pages). A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2649  */
2650 #define CIFS_MAX_WSIZE ((1<<24) - PAGE_CACHE_SIZE)
2651
2652 /*
2653  * When the server doesn't allow large posix writes, default to a wsize of
2654  * 128k - PAGE_CACHE_SIZE -- one page less than the largest frame size
2655  * described in RFC1001. This allows space for the header without going over
2656  * that by default.
2657  */
2658 #define CIFS_MAX_RFC1001_WSIZE (128 * 1024 - PAGE_CACHE_SIZE)
2659
2660 /*
2661  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2662  * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2663  * a single wsize request with a single call.
2664  */
2665 #define CIFS_DEFAULT_WSIZE (1024 * 1024)
2666
2667 static unsigned int
2668 cifs_negotiate_wsize(struct cifsTconInfo *tcon, struct smb_vol *pvolume_info)
2669 {
2670         __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2671         struct TCP_Server_Info *server = tcon->ses->server;
2672         unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
2673                                 CIFS_DEFAULT_WSIZE;
2674
2675         /* can server support 24-bit write sizes? (via UNIX extensions) */
2676         if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2677                 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1001_WSIZE);
2678
2679         /* no CAP_LARGE_WRITE_X? Limit it to 16 bits */
2680         if (!(server->capabilities & CAP_LARGE_WRITE_X))
2681                 wsize = min_t(unsigned int, wsize, USHRT_MAX);
2682
2683         /* hard limit of CIFS_MAX_WSIZE */
2684         wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2685
2686         return wsize;
2687 }
2688
2689 static int
2690 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2691                    struct cifs_sb_info *cifs_sb, const char *full_path)
2692 {
2693         int rc;
2694         FILE_ALL_INFO *pfile_info;
2695
2696         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2697         if (pfile_info == NULL)
2698                 return -ENOMEM;
2699
2700         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2701                               0 /* not legacy */, cifs_sb->local_nls,
2702                               cifs_sb->mnt_cifs_flags &
2703                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2704
2705         if (rc == -EOPNOTSUPP || rc == -EINVAL)
2706                 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
2707                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
2708                                   CIFS_MOUNT_MAP_SPECIAL_CHR);
2709         kfree(pfile_info);
2710         return rc;
2711 }
2712
2713 void
2714 cifs_cleanup_volume_info(struct smb_vol **pvolume_info)
2715 {
2716         struct smb_vol *volume_info;
2717
2718         if (!pvolume_info || !*pvolume_info)
2719                 return;
2720
2721         volume_info = *pvolume_info;
2722         kfree(volume_info->username);
2723         kzfree(volume_info->password);
2724         kfree(volume_info->UNC);
2725         kfree(volume_info->UNCip);
2726         kfree(volume_info->domainname);
2727         kfree(volume_info->iocharset);
2728         kfree(volume_info->prepath);
2729         kfree(volume_info);
2730         *pvolume_info = NULL;
2731         return;
2732 }
2733
2734 #ifdef CONFIG_CIFS_DFS_UPCALL
2735 /* build_path_to_root returns full path to root when
2736  * we do not have an exiting connection (tcon) */
2737 static char *
2738 build_unc_path_to_root(const struct smb_vol *volume_info,
2739                 const struct cifs_sb_info *cifs_sb)
2740 {
2741         char *full_path;
2742
2743         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2744         full_path = kmalloc(unc_len + 1, GFP_KERNEL);
2745         if (full_path == NULL)
2746                 return ERR_PTR(-ENOMEM);
2747
2748         strncpy(full_path, volume_info->UNC, unc_len);
2749         full_path[unc_len] = 0; /* add trailing null */
2750         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
2751         return full_path;
2752 }
2753
2754 /*
2755  * Perform a dfs referral query for a share and (optionally) prefix
2756  *
2757  * If a referral is found, cifs_sb->mountdata will be (re-)allocated
2758  * to a string containing updated options for the submount.  Otherwise it
2759  * will be left untouched.
2760  *
2761  * Returns the rc from get_dfs_path to the caller, which can be used to
2762  * determine whether there were referrals.
2763  */
2764 static int
2765 expand_dfs_referral(int xid, struct cifsSesInfo *pSesInfo,
2766                     struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
2767                     int check_prefix)
2768 {
2769         int rc;
2770         unsigned int num_referrals = 0;
2771         struct dfs_info3_param *referrals = NULL;
2772         char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
2773
2774         full_path = build_unc_path_to_root(volume_info, cifs_sb);
2775         if (IS_ERR(full_path))
2776                 return PTR_ERR(full_path);
2777
2778         /* For DFS paths, skip the first '\' of the UNC */
2779         ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
2780
2781         rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
2782                           &num_referrals, &referrals,
2783                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2784
2785         if (!rc && num_referrals > 0) {
2786                 char *fake_devname = NULL;
2787
2788                 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
2789                                                    full_path + 1, referrals,
2790                                                    &fake_devname);
2791
2792                 free_dfs_info_array(referrals, num_referrals);
2793                 kfree(fake_devname);
2794
2795                 if (cifs_sb->mountdata != NULL)
2796                         kfree(cifs_sb->mountdata);
2797
2798                 if (IS_ERR(mdata)) {
2799                         rc = PTR_ERR(mdata);
2800                         mdata = NULL;
2801                 }
2802                 cifs_sb->mountdata = mdata;
2803         }
2804         kfree(full_path);
2805         return rc;
2806 }
2807 #endif
2808
2809 int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,
2810                            const char *devname)
2811 {
2812         struct smb_vol *volume_info;
2813         int rc = 0;
2814
2815         *pvolume_info = NULL;
2816
2817         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2818         if (!volume_info) {
2819                 rc = -ENOMEM;
2820                 goto out;
2821         }
2822
2823         if (cifs_parse_mount_options(mount_data, devname,
2824                                      volume_info)) {
2825                 rc = -EINVAL;
2826                 goto out;
2827         }
2828
2829         if (volume_info->nullauth) {
2830                 cFYI(1, "null user");
2831                 volume_info->username = "";
2832         } else if (volume_info->username) {
2833                 /* BB fixme parse for domain name here */
2834                 cFYI(1, "Username: %s", volume_info->username);
2835         } else {
2836                 cifserror("No username specified");
2837         /* In userspace mount helper we can get user name from alternate
2838            locations such as env variables and files on disk */
2839                 rc = -EINVAL;
2840                 goto out;
2841         }
2842
2843         /* this is needed for ASCII cp to Unicode converts */
2844         if (volume_info->iocharset == NULL) {
2845                 /* load_nls_default cannot return null */
2846                 volume_info->local_nls = load_nls_default();
2847         } else {
2848                 volume_info->local_nls = load_nls(volume_info->iocharset);
2849                 if (volume_info->local_nls == NULL) {
2850                         cERROR(1, "CIFS mount error: iocharset %s not found",
2851                                  volume_info->iocharset);
2852                         rc = -ELIBACC;
2853                         goto out;
2854                 }
2855         }
2856
2857         *pvolume_info = volume_info;
2858         return rc;
2859 out:
2860         cifs_cleanup_volume_info(&volume_info);
2861         return rc;
2862 }
2863
2864 int
2865 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2866            struct smb_vol *volume_info, const char *devname)
2867 {
2868         int rc = 0;
2869         int xid;
2870         struct cifsSesInfo *pSesInfo;
2871         struct cifsTconInfo *tcon;
2872         struct TCP_Server_Info *srvTcp;
2873         char   *full_path;
2874         struct tcon_link *tlink;
2875 #ifdef CONFIG_CIFS_DFS_UPCALL
2876         int referral_walks_count = 0;
2877 try_mount_again:
2878         /* cleanup activities if we're chasing a referral */
2879         if (referral_walks_count) {
2880                 if (tcon)
2881                         cifs_put_tcon(tcon);
2882                 else if (pSesInfo)
2883                         cifs_put_smb_ses(pSesInfo);
2884
2885                 cifs_cleanup_volume_info(&volume_info);
2886                 FreeXid(xid);
2887         }
2888 #endif
2889         tcon = NULL;
2890         pSesInfo = NULL;
2891         srvTcp = NULL;
2892         full_path = NULL;
2893         tlink = NULL;
2894
2895         xid = GetXid();
2896
2897         /* get a reference to a tcp session */
2898         srvTcp = cifs_get_tcp_session(volume_info);
2899         if (IS_ERR(srvTcp)) {
2900                 rc = PTR_ERR(srvTcp);
2901                 goto out;
2902         }
2903
2904         /* get a reference to a SMB session */
2905         pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2906         if (IS_ERR(pSesInfo)) {
2907                 rc = PTR_ERR(pSesInfo);
2908                 pSesInfo = NULL;
2909                 goto mount_fail_check;
2910         }
2911
2912         if (pSesInfo->capabilities & CAP_LARGE_FILES)
2913                 sb->s_maxbytes = MAX_LFS_FILESIZE;
2914         else
2915                 sb->s_maxbytes = MAX_NON_LFS;
2916
2917         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2918         sb->s_time_gran = 100;
2919
2920         /* search for existing tcon to this server share */
2921         tcon = cifs_get_tcon(pSesInfo, volume_info);
2922         if (IS_ERR(tcon)) {
2923                 rc = PTR_ERR(tcon);
2924                 tcon = NULL;
2925                 goto remote_path_check;
2926         }
2927
2928         /* tell server which Unix caps we support */
2929         if (tcon->ses->capabilities & CAP_UNIX) {
2930                 /* reset of caps checks mount to see if unix extensions
2931                    disabled for just this mount */
2932                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2933                 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
2934                     (le64_to_cpu(tcon->fsUnixInfo.Capability) &
2935                      CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
2936                         rc = -EACCES;
2937                         goto mount_fail_check;
2938                 }
2939         } else
2940                 tcon->unix_ext = 0; /* server does not support them */
2941
2942         /* do not care if following two calls succeed - informational */
2943         if (!tcon->ipc) {
2944                 CIFSSMBQFSDeviceInfo(xid, tcon);
2945                 CIFSSMBQFSAttributeInfo(xid, tcon);
2946         }
2947
2948         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2949                 cifs_sb->rsize = 1024 * 127;
2950                 cFYI(DBG2, "no very large read support, rsize now 127K");
2951         }
2952         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2953                 cifs_sb->rsize = min(cifs_sb->rsize,
2954                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2955
2956         cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
2957
2958 remote_path_check:
2959 #ifdef CONFIG_CIFS_DFS_UPCALL
2960         /*
2961          * Perform an unconditional check for whether there are DFS
2962          * referrals for this path without prefix, to provide support
2963          * for DFS referrals from w2k8 servers which don't seem to respond
2964          * with PATH_NOT_COVERED to requests that include the prefix.
2965          * Chase the referral if found, otherwise continue normally.
2966          */
2967         if (referral_walks_count == 0) {
2968                 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
2969                                                 cifs_sb, false);
2970                 if (!refrc) {
2971                         referral_walks_count++;
2972                         goto try_mount_again;
2973                 }
2974         }
2975 #endif
2976
2977         /* check if a whole path is not remote */
2978         if (!rc && tcon) {
2979                 /* build_path_to_root works only when we have a valid tcon */
2980                 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
2981                 if (full_path == NULL) {
2982                         rc = -ENOMEM;
2983                         goto mount_fail_check;
2984                 }
2985                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2986                 if (rc != 0 && rc != -EREMOTE) {
2987                         kfree(full_path);
2988                         goto mount_fail_check;
2989                 }
2990                 kfree(full_path);
2991         }
2992
2993         /* get referral if needed */
2994         if (rc == -EREMOTE) {
2995 #ifdef CONFIG_CIFS_DFS_UPCALL
2996                 if (referral_walks_count > MAX_NESTED_LINKS) {
2997                         /*
2998                          * BB: when we implement proper loop detection,
2999                          *     we will remove this check. But now we need it
3000                          *     to prevent an indefinite loop if 'DFS tree' is
3001                          *     misconfigured (i.e. has loops).
3002                          */
3003                         rc = -ELOOP;
3004                         goto mount_fail_check;
3005                 }
3006
3007                 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3008                                          true);
3009
3010                 if (!rc) {
3011                         referral_walks_count++;
3012                         goto try_mount_again;
3013                 }
3014                 goto mount_fail_check;
3015 #else /* No DFS support, return error on mount */
3016                 rc = -EOPNOTSUPP;
3017 #endif
3018         }
3019
3020         if (rc)
3021                 goto mount_fail_check;
3022
3023         /* now, hang the tcon off of the superblock */
3024         tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3025         if (tlink == NULL) {
3026                 rc = -ENOMEM;
3027                 goto mount_fail_check;
3028         }
3029
3030         tlink->tl_uid = pSesInfo->linux_uid;
3031         tlink->tl_tcon = tcon;
3032         tlink->tl_time = jiffies;
3033         set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3034         set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3035
3036         cifs_sb->master_tlink = tlink;
3037         spin_lock(&cifs_sb->tlink_tree_lock);
3038         tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3039         spin_unlock(&cifs_sb->tlink_tree_lock);
3040
3041         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3042                                 TLINK_IDLE_EXPIRE);
3043
3044 mount_fail_check:
3045         /* on error free sesinfo and tcon struct if needed */
3046         if (rc) {
3047                 /* If find_unc succeeded then rc == 0 so we can not end */
3048                 /* up accidentally freeing someone elses tcon struct */
3049                 if (tcon)
3050                         cifs_put_tcon(tcon);
3051                 else if (pSesInfo)
3052                         cifs_put_smb_ses(pSesInfo);
3053                 else
3054                         cifs_put_tcp_session(srvTcp);
3055                 goto out;
3056         }
3057
3058         /* volume_info->password is freed above when existing session found
3059         (in which case it is not needed anymore) but when new sesion is created
3060         the password ptr is put in the new session structure (in which case the
3061         password will be freed at unmount time) */
3062 out:
3063         /* zero out password before freeing */
3064         FreeXid(xid);
3065         return rc;
3066 }
3067
3068 int
3069 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
3070          const char *tree, struct cifsTconInfo *tcon,
3071          const struct nls_table *nls_codepage)
3072 {
3073         struct smb_hdr *smb_buffer;
3074         struct smb_hdr *smb_buffer_response;
3075         TCONX_REQ *pSMB;
3076         TCONX_RSP *pSMBr;
3077         unsigned char *bcc_ptr;
3078         int rc = 0;
3079         int length;
3080         __u16 bytes_left, count;
3081
3082         if (ses == NULL)
3083                 return -EIO;
3084
3085         smb_buffer = cifs_buf_get();
3086         if (smb_buffer == NULL)
3087                 return -ENOMEM;
3088
3089         smb_buffer_response = smb_buffer;
3090
3091         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3092                         NULL /*no tid */ , 4 /*wct */ );
3093
3094         smb_buffer->Mid = GetNextMid(ses->server);
3095         smb_buffer->Uid = ses->Suid;
3096         pSMB = (TCONX_REQ *) smb_buffer;
3097         pSMBr = (TCONX_RSP *) smb_buffer_response;
3098
3099         pSMB->AndXCommand = 0xFF;
3100         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3101         bcc_ptr = &pSMB->Password[0];
3102         if ((ses->server->secMode) & SECMODE_USER) {
3103                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
3104                 *bcc_ptr = 0; /* password is null byte */
3105                 bcc_ptr++;              /* skip password */
3106                 /* already aligned so no need to do it below */
3107         } else {
3108                 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3109                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3110                    specified as required (when that support is added to
3111                    the vfs in the future) as only NTLM or the much
3112                    weaker LANMAN (which we do not send by default) is accepted
3113                    by Samba (not sure whether other servers allow
3114                    NTLMv2 password here) */
3115 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3116                 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3117                     (ses->server->secType == LANMAN))
3118                         calc_lanman_hash(tcon->password, ses->server->cryptkey,
3119                                          ses->server->secMode &
3120                                             SECMODE_PW_ENCRYPT ? true : false,
3121                                          bcc_ptr);
3122                 else
3123 #endif /* CIFS_WEAK_PW_HASH */
3124                 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3125                                         bcc_ptr);
3126
3127                 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3128                 if (ses->capabilities & CAP_UNICODE) {
3129                         /* must align unicode strings */
3130                         *bcc_ptr = 0; /* null byte password */
3131                         bcc_ptr++;
3132                 }
3133         }
3134
3135         if (ses->server->secMode &
3136                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3137                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3138
3139         if (ses->capabilities & CAP_STATUS32) {
3140                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3141         }
3142         if (ses->capabilities & CAP_DFS) {
3143                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3144         }
3145         if (ses->capabilities & CAP_UNICODE) {
3146                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3147                 length =
3148                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3149                         6 /* max utf8 char length in bytes */ *
3150                         (/* server len*/ + 256 /* share len */), nls_codepage);
3151                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3152                 bcc_ptr += 2;   /* skip trailing null */
3153         } else {                /* ASCII */
3154                 strcpy(bcc_ptr, tree);
3155                 bcc_ptr += strlen(tree) + 1;
3156         }
3157         strcpy(bcc_ptr, "?????");
3158         bcc_ptr += strlen("?????");
3159         bcc_ptr += 1;
3160         count = bcc_ptr - &pSMB->Password[0];
3161         pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3162                                         pSMB->hdr.smb_buf_length) + count);
3163         pSMB->ByteCount = cpu_to_le16(count);
3164
3165         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3166                          0);
3167
3168         /* above now done in SendReceive */
3169         if ((rc == 0) && (tcon != NULL)) {
3170                 bool is_unicode;
3171
3172                 tcon->tidStatus = CifsGood;
3173                 tcon->need_reconnect = false;
3174                 tcon->tid = smb_buffer_response->Tid;
3175                 bcc_ptr = pByteArea(smb_buffer_response);
3176                 bytes_left = get_bcc(smb_buffer_response);
3177                 length = strnlen(bcc_ptr, bytes_left - 2);
3178                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3179                         is_unicode = true;
3180                 else
3181                         is_unicode = false;
3182
3183
3184                 /* skip service field (NB: this field is always ASCII) */
3185                 if (length == 3) {
3186                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3187                             (bcc_ptr[2] == 'C')) {
3188                                 cFYI(1, "IPC connection");
3189                                 tcon->ipc = 1;
3190                         }
3191                 } else if (length == 2) {
3192                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3193                                 /* the most common case */
3194                                 cFYI(1, "disk share connection");
3195                         }
3196                 }
3197                 bcc_ptr += length + 1;
3198                 bytes_left -= (length + 1);
3199                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3200
3201                 /* mostly informational -- no need to fail on error here */
3202                 kfree(tcon->nativeFileSystem);
3203                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3204                                                       bytes_left, is_unicode,
3205                                                       nls_codepage);
3206
3207                 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3208
3209                 if ((smb_buffer_response->WordCount == 3) ||
3210                          (smb_buffer_response->WordCount == 7))
3211                         /* field is in same location */
3212                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3213                 else
3214                         tcon->Flags = 0;
3215                 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3216         } else if ((rc == 0) && tcon == NULL) {
3217                 /* all we need to save for IPC$ connection */
3218                 ses->ipc_tid = smb_buffer_response->Tid;
3219         }
3220
3221         cifs_buf_release(smb_buffer);
3222         return rc;
3223 }
3224
3225 int
3226 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3227 {
3228         struct rb_root *root = &cifs_sb->tlink_tree;
3229         struct rb_node *node;
3230         struct tcon_link *tlink;
3231
3232         cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3233
3234         spin_lock(&cifs_sb->tlink_tree_lock);
3235         while ((node = rb_first(root))) {
3236                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3237                 cifs_get_tlink(tlink);
3238                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3239                 rb_erase(node, root);
3240
3241                 spin_unlock(&cifs_sb->tlink_tree_lock);
3242                 cifs_put_tlink(tlink);
3243                 spin_lock(&cifs_sb->tlink_tree_lock);
3244         }
3245         spin_unlock(&cifs_sb->tlink_tree_lock);
3246
3247         return 0;
3248 }
3249
3250 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
3251 {
3252         int rc = 0;
3253         struct TCP_Server_Info *server = ses->server;
3254
3255         /* only send once per connect */
3256         if (server->maxBuf != 0)
3257                 return 0;
3258
3259         rc = CIFSSMBNegotiate(xid, ses);
3260         if (rc == -EAGAIN) {
3261                 /* retry only once on 1st time connection */
3262                 rc = CIFSSMBNegotiate(xid, ses);
3263                 if (rc == -EAGAIN)
3264                         rc = -EHOSTDOWN;
3265         }
3266         if (rc == 0) {
3267                 spin_lock(&GlobalMid_Lock);
3268                 if (server->tcpStatus != CifsExiting)
3269                         server->tcpStatus = CifsGood;
3270                 else
3271                         rc = -EHOSTDOWN;
3272                 spin_unlock(&GlobalMid_Lock);
3273
3274         }
3275
3276         return rc;
3277 }
3278
3279
3280 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3281                         struct nls_table *nls_info)
3282 {
3283         int rc = 0;
3284         struct TCP_Server_Info *server = ses->server;
3285
3286         ses->flags = 0;
3287         ses->capabilities = server->capabilities;
3288         if (linuxExtEnabled == 0)
3289                 ses->capabilities &= (~CAP_UNIX);
3290
3291         cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3292                  server->secMode, server->capabilities, server->timeAdj);
3293
3294         rc = CIFS_SessSetup(xid, ses, nls_info);
3295         if (rc) {
3296                 cERROR(1, "Send error in SessSetup = %d", rc);
3297         } else {
3298                 mutex_lock(&ses->server->srv_mutex);
3299                 if (!server->session_estab) {
3300                         server->session_key.response = ses->auth_key.response;
3301                         server->session_key.len = ses->auth_key.len;
3302                         server->sequence_number = 0x2;
3303                         server->session_estab = true;
3304                         ses->auth_key.response = NULL;
3305                 }
3306                 mutex_unlock(&server->srv_mutex);
3307
3308                 cFYI(1, "CIFS Session Established successfully");
3309                 spin_lock(&GlobalMid_Lock);
3310                 ses->status = CifsGood;
3311                 ses->need_reconnect = false;
3312                 spin_unlock(&GlobalMid_Lock);
3313         }
3314
3315         kfree(ses->auth_key.response);
3316         ses->auth_key.response = NULL;
3317         ses->auth_key.len = 0;
3318         kfree(ses->ntlmssp);
3319         ses->ntlmssp = NULL;
3320
3321         return rc;
3322 }
3323
3324 static struct cifsTconInfo *
3325 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3326 {
3327         struct cifsTconInfo *master_tcon = cifs_sb_master_tcon(cifs_sb);
3328         struct cifsSesInfo *ses;
3329         struct cifsTconInfo *tcon = NULL;
3330         struct smb_vol *vol_info;
3331         char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3332                            /* We used to have this as MAX_USERNAME which is   */
3333                            /* way too big now (256 instead of 32) */
3334
3335         vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3336         if (vol_info == NULL) {
3337                 tcon = ERR_PTR(-ENOMEM);
3338                 goto out;
3339         }
3340
3341         snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
3342         vol_info->username = username;
3343         vol_info->local_nls = cifs_sb->local_nls;
3344         vol_info->linux_uid = fsuid;
3345         vol_info->cred_uid = fsuid;
3346         vol_info->UNC = master_tcon->treeName;
3347         vol_info->retry = master_tcon->retry;
3348         vol_info->nocase = master_tcon->nocase;
3349         vol_info->local_lease = master_tcon->local_lease;
3350         vol_info->no_linux_ext = !master_tcon->unix_ext;
3351
3352         /* FIXME: allow for other secFlg settings */
3353         vol_info->secFlg = CIFSSEC_MUST_KRB5;
3354
3355         /* get a reference for the same TCP session */
3356         spin_lock(&cifs_tcp_ses_lock);
3357         ++master_tcon->ses->server->srv_count;
3358         spin_unlock(&cifs_tcp_ses_lock);
3359
3360         ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3361         if (IS_ERR(ses)) {
3362                 tcon = (struct cifsTconInfo *)ses;
3363                 cifs_put_tcp_session(master_tcon->ses->server);
3364                 goto out;
3365         }
3366
3367         tcon = cifs_get_tcon(ses, vol_info);
3368         if (IS_ERR(tcon)) {
3369                 cifs_put_smb_ses(ses);
3370                 goto out;
3371         }
3372
3373         if (ses->capabilities & CAP_UNIX)
3374                 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3375 out:
3376         kfree(vol_info);
3377
3378         return tcon;
3379 }
3380
3381 static inline struct tcon_link *
3382 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
3383 {
3384         return cifs_sb->master_tlink;
3385 }
3386
3387 struct cifsTconInfo *
3388 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3389 {
3390         return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3391 }
3392
3393 static int
3394 cifs_sb_tcon_pending_wait(void *unused)
3395 {
3396         schedule();
3397         return signal_pending(current) ? -ERESTARTSYS : 0;
3398 }
3399
3400 /* find and return a tlink with given uid */
3401 static struct tcon_link *
3402 tlink_rb_search(struct rb_root *root, uid_t uid)
3403 {
3404         struct rb_node *node = root->rb_node;
3405         struct tcon_link *tlink;
3406
3407         while (node) {
3408                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3409
3410                 if (tlink->tl_uid > uid)
3411                         node = node->rb_left;
3412                 else if (tlink->tl_uid < uid)
3413                         node = node->rb_right;
3414                 else
3415                         return tlink;
3416         }
3417         return NULL;
3418 }
3419
3420 /* insert a tcon_link into the tree */
3421 static void
3422 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3423 {
3424         struct rb_node **new = &(root->rb_node), *parent = NULL;
3425         struct tcon_link *tlink;
3426
3427         while (*new) {
3428                 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3429                 parent = *new;
3430
3431                 if (tlink->tl_uid > new_tlink->tl_uid)
3432                         new = &((*new)->rb_left);
3433                 else
3434                         new = &((*new)->rb_right);
3435         }
3436
3437         rb_link_node(&new_tlink->tl_rbnode, parent, new);
3438         rb_insert_color(&new_tlink->tl_rbnode, root);
3439 }
3440
3441 /*
3442  * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3443  * current task.
3444  *
3445  * If the superblock doesn't refer to a multiuser mount, then just return
3446  * the master tcon for the mount.
3447  *
3448  * First, search the rbtree for an existing tcon for this fsuid. If one
3449  * exists, then check to see if it's pending construction. If it is then wait
3450  * for construction to complete. Once it's no longer pending, check to see if
3451  * it failed and either return an error or retry construction, depending on
3452  * the timeout.
3453  *
3454  * If one doesn't exist then insert a new tcon_link struct into the tree and
3455  * try to construct a new one.
3456  */
3457 struct tcon_link *
3458 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3459 {
3460         int ret;
3461         uid_t fsuid = current_fsuid();
3462         struct tcon_link *tlink, *newtlink;
3463
3464         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3465                 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3466
3467         spin_lock(&cifs_sb->tlink_tree_lock);
3468         tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3469         if (tlink)
3470                 cifs_get_tlink(tlink);
3471         spin_unlock(&cifs_sb->tlink_tree_lock);
3472
3473         if (tlink == NULL) {
3474                 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3475                 if (newtlink == NULL)
3476                         return ERR_PTR(-ENOMEM);
3477                 newtlink->tl_uid = fsuid;
3478                 newtlink->tl_tcon = ERR_PTR(-EACCES);
3479                 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3480                 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3481                 cifs_get_tlink(newtlink);
3482
3483                 spin_lock(&cifs_sb->tlink_tree_lock);
3484                 /* was one inserted after previous search? */
3485                 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3486                 if (tlink) {
3487                         cifs_get_tlink(tlink);
3488                         spin_unlock(&cifs_sb->tlink_tree_lock);
3489                         kfree(newtlink);
3490                         goto wait_for_construction;
3491                 }
3492                 tlink = newtlink;
3493                 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3494                 spin_unlock(&cifs_sb->tlink_tree_lock);
3495         } else {
3496 wait_for_construction:
3497                 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3498                                   cifs_sb_tcon_pending_wait,
3499                                   TASK_INTERRUPTIBLE);
3500                 if (ret) {
3501                         cifs_put_tlink(tlink);
3502                         return ERR_PTR(ret);
3503                 }
3504
3505                 /* if it's good, return it */
3506                 if (!IS_ERR(tlink->tl_tcon))
3507                         return tlink;
3508
3509                 /* return error if we tried this already recently */
3510                 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3511                         cifs_put_tlink(tlink);
3512                         return ERR_PTR(-EACCES);
3513                 }
3514
3515                 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3516                         goto wait_for_construction;
3517         }
3518
3519         tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3520         clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3521         wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3522
3523         if (IS_ERR(tlink->tl_tcon)) {
3524                 cifs_put_tlink(tlink);
3525                 return ERR_PTR(-EACCES);
3526         }
3527
3528         return tlink;
3529 }
3530
3531 /*
3532  * periodic workqueue job that scans tcon_tree for a superblock and closes
3533  * out tcons.
3534  */
3535 static void
3536 cifs_prune_tlinks(struct work_struct *work)
3537 {
3538         struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3539                                                     prune_tlinks.work);
3540         struct rb_root *root = &cifs_sb->tlink_tree;
3541         struct rb_node *node = rb_first(root);
3542         struct rb_node *tmp;
3543         struct tcon_link *tlink;
3544
3545         /*
3546          * Because we drop the spinlock in the loop in order to put the tlink
3547          * it's not guarded against removal of links from the tree. The only
3548          * places that remove entries from the tree are this function and
3549          * umounts. Because this function is non-reentrant and is canceled
3550          * before umount can proceed, this is safe.
3551          */
3552         spin_lock(&cifs_sb->tlink_tree_lock);
3553         node = rb_first(root);
3554         while (node != NULL) {
3555                 tmp = node;
3556                 node = rb_next(tmp);
3557                 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3558
3559                 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3560                     atomic_read(&tlink->tl_count) != 0 ||
3561                     time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3562                         continue;
3563
3564                 cifs_get_tlink(tlink);
3565                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3566                 rb_erase(tmp, root);
3567
3568                 spin_unlock(&cifs_sb->tlink_tree_lock);
3569                 cifs_put_tlink(tlink);
3570                 spin_lock(&cifs_sb->tlink_tree_lock);
3571         }
3572         spin_unlock(&cifs_sb->tlink_tree_lock);
3573
3574         queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3575                                 TLINK_IDLE_EXPIRE);
3576 }