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   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   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/ipv6.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 <asm/uaccess.h>
  37 #include <asm/processor.h>
  38 #include "cifspdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_unicode.h"
  42 #include "cifs_debug.h"
  43 #include "cifs_fs_sb.h"
  44 #include "ntlmssp.h"
  45 #include "nterr.h"
  46 #include "rfc1002pdu.h"
  47 #include "cn_cifs.h"
  48
  49 #define CIFS_PORT 445
  50 #define RFC1001_PORT 139
  51
  52 static DECLARE_COMPLETION(cifsd_complete);
  53
  54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  55                          unsigned char *p24);
  56
  57 extern mempool_t *cifs_req_poolp;
  58
  59 struct smb_vol {
  60         char *username;
  61         char *password;
  62         char *domainname;
  63         char *UNC;
  64         char *UNCip;
  65         char *in6_addr;  /* ipv6 address as human readable form of in6_addr */
  66         char *iocharset;  /* local code page for mapping to and from Unicode */
  67         char source_rfc1001_name[16]; /* netbios name of client */
  68         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  69         uid_t linux_uid;
  70         gid_t linux_gid;
  71         mode_t file_mode;
  72         mode_t dir_mode;
  73         unsigned secFlg;
  74         unsigned rw:1;
  75         unsigned retry:1;
  76         unsigned intr:1;
  77         unsigned setuids:1;
  78         unsigned override_uid:1;
  79         unsigned override_gid:1;
  80         unsigned noperm:1;
  81         unsigned no_psx_acl:1; /* set if posix acl support should be disabled */
  82         unsigned cifs_acl:1;
  83         unsigned no_xattr:1;   /* set if xattr (EA) support should be disabled*/
  84         unsigned server_ino:1; /* use inode numbers from server ie UniqueId */
  85         unsigned direct_io:1;
  86         unsigned remap:1;   /* set to remap seven reserved chars in filenames */
  87         unsigned posix_paths:1;   /* unset to not ask for posix pathnames. */
  88         unsigned no_linux_ext:1;
  89         unsigned sfu_emul:1;
  90         unsigned nullauth:1; /* attempt to authenticate with null user */
  91         unsigned nocase;     /* request case insensitive filenames */
  92         unsigned nobrl;      /* disable sending byte range locks to srv */
  93         unsigned int rsize;
  94         unsigned int wsize;
  95         unsigned int sockopt;
  96         unsigned short int port;
  97         char *prepath;
  98 };
  99
 100 static int ipv4_connect(struct sockaddr_in *psin_server,
 101                         struct socket **csocket,
 102                         char *netb_name,
 103                         char *server_netb_name);
 104 static int ipv6_connect(struct sockaddr_in6 *psin_server,
 105                         struct socket **csocket);
 106
 107
 108         /*
 109          * cifs tcp session reconnection
 110          *
 111          * mark tcp session as reconnecting so temporarily locked
 112          * mark all smb sessions as reconnecting for tcp session
 113          * reconnect tcp session
 114          * wake up waiters on reconnection? - (not needed currently)
 115          */
 116
 117 static int
 118 cifs_reconnect(struct TCP_Server_Info *server)
 119 {
 120         int rc = 0;
 121         struct list_head *tmp;
 122         struct cifsSesInfo *ses;
 123         struct cifsTconInfo *tcon;
 124         struct mid_q_entry *mid_entry;
 125
 126         spin_lock(&GlobalMid_Lock);
 127         if (kthread_should_stop()) {
 128                 /* the demux thread will exit normally
 129                 next time through the loop */
 130                 spin_unlock(&GlobalMid_Lock);
 131                 return rc;
 132         } else
 133                 server->tcpStatus = CifsNeedReconnect;
 134         spin_unlock(&GlobalMid_Lock);
 135         server->maxBuf = 0;
 136
 137         cFYI(1, ("Reconnecting tcp session"));
 138
 139         /* before reconnecting the tcp session, mark the smb session (uid)
 140                 and the tid bad so they are not used until reconnected */
 141         read_lock(&GlobalSMBSeslock);
 142         list_for_each(tmp, &GlobalSMBSessionList) {
 143                 ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
 144                 if (ses->server) {
 145                         if (ses->server == server) {
 146                                 ses->status = CifsNeedReconnect;
 147                                 ses->ipc_tid = 0;
 148                         }
 149                 }
 150                 /* else tcp and smb sessions need reconnection */
 151         }
 152         list_for_each(tmp, &GlobalTreeConnectionList) {
 153                 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
 154                 if ((tcon) && (tcon->ses) && (tcon->ses->server == server))
 155                         tcon->tidStatus = CifsNeedReconnect;
 156         }
 157         read_unlock(&GlobalSMBSeslock);
 158         /* do not want to be sending data on a socket we are freeing */
 159         down(&server->tcpSem);
 160         if (server->ssocket) {
 161                 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
 162                         server->ssocket->flags));
 163                 server->ssocket->ops->shutdown(server->ssocket, SEND_SHUTDOWN);
 164                 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
 165                         server->ssocket->state,
 166                         server->ssocket->flags));
 167                 sock_release(server->ssocket);
 168                 server->ssocket = NULL;
 169         }
 170
 171         spin_lock(&GlobalMid_Lock);
 172         list_for_each(tmp, &server->pending_mid_q) {
 173                 mid_entry = list_entry(tmp, struct
 174                                         mid_q_entry,
 175                                         qhead);
 176                 if (mid_entry) {
 177                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 178                                 /* Mark other intransit requests as needing
 179                                    retry so we do not immediately mark the
 180                                    session bad again (ie after we reconnect
 181                                    below) as they timeout too */
 182                                 mid_entry->midState = MID_RETRY_NEEDED;
 183                         }
 184                 }
 185         }
 186         spin_unlock(&GlobalMid_Lock);
 187         up(&server->tcpSem);
 188
 189         while ((!kthread_should_stop()) && (server->tcpStatus != CifsGood)) {
 190                 try_to_freeze();
 191                 if (server->protocolType == IPV6) {
 192                         rc = ipv6_connect(&server->addr.sockAddr6,
 193                                           &server->ssocket);
 194                 } else {
 195                         rc = ipv4_connect(&server->addr.sockAddr,
 196                                         &server->ssocket,
 197                                         server->workstation_RFC1001_name,
 198                                         server->server_RFC1001_name);
 199                 }
 200                 if (rc) {
 201                         cFYI(1, ("reconnect error %d", rc));
 202                         msleep(3000);
 203                 } else {
 204                         atomic_inc(&tcpSesReconnectCount);
 205                         spin_lock(&GlobalMid_Lock);
 206                         if (!kthread_should_stop())
 207                                 server->tcpStatus = CifsGood;
 208                         server->sequence_number = 0;
 209                         spin_unlock(&GlobalMid_Lock);
 210         /*              atomic_set(&server->inFlight,0);*/
 211                         wake_up(&server->response_q);
 212                 }
 213         }
 214         return rc;
 215 }
 216
 217 /*
 218         return codes:
 219                 0       not a transact2, or all data present
 220                 >0      transact2 with that much data missing
 221                 -EINVAL = invalid transact2
 222
 223  */
 224 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 225 {
 226         struct smb_t2_rsp *pSMBt;
 227         int total_data_size;
 228         int data_in_this_rsp;
 229         int remaining;
 230
 231         if (pSMB->Command != SMB_COM_TRANSACTION2)
 232                 return 0;
 233
 234         /* check for plausible wct, bcc and t2 data and parm sizes */
 235         /* check for parm and data offset going beyond end of smb */
 236         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 237                 cFYI(1, ("invalid transact2 word count"));
 238                 return -EINVAL;
 239         }
 240
 241         pSMBt = (struct smb_t2_rsp *)pSMB;
 242
 243         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 244         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 245
 246         remaining = total_data_size - data_in_this_rsp;
 247
 248         if (remaining == 0)
 249                 return 0;
 250         else if (remaining < 0) {
 251                 cFYI(1, ("total data %d smaller than data in frame %d",
 252                         total_data_size, data_in_this_rsp));
 253                 return -EINVAL;
 254         } else {
 255                 cFYI(1, ("missing %d bytes from transact2, check next response",
 256                         remaining));
 257                 if (total_data_size > maxBufSize) {
 258                         cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
 259                                 total_data_size, maxBufSize));
 260                         return -EINVAL;
 261                 }
 262                 return remaining;
 263         }
 264 }
 265
 266 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 267 {
 268         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 269         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 270         int total_data_size;
 271         int total_in_buf;
 272         int remaining;
 273         int total_in_buf2;
 274         char *data_area_of_target;
 275         char *data_area_of_buf2;
 276         __u16 byte_count;
 277
 278         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 279
 280         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 281                 cFYI(1, ("total data size of primary and secondary t2 differ"));
 282         }
 283
 284         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 285
 286         remaining = total_data_size - total_in_buf;
 287
 288         if (remaining < 0)
 289                 return -EINVAL;
 290
 291         if (remaining == 0) /* nothing to do, ignore */
 292                 return 0;
 293
 294         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 295         if (remaining < total_in_buf2) {
 296                 cFYI(1, ("transact2 2nd response contains too much data"));
 297         }
 298
 299         /* find end of first SMB data area */
 300         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 301                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 302         /* validate target area */
 303
 304         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 305                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 306
 307         data_area_of_target += total_in_buf;
 308
 309         /* copy second buffer into end of first buffer */
 310         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 311         total_in_buf += total_in_buf2;
 312         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 313         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 314         byte_count += total_in_buf2;
 315         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 316
 317         byte_count = pTargetSMB->smb_buf_length;
 318         byte_count += total_in_buf2;
 319
 320         /* BB also add check that we are not beyond maximum buffer size */
 321
 322         pTargetSMB->smb_buf_length = byte_count;
 323
 324         if (remaining == total_in_buf2) {
 325                 cFYI(1, ("found the last secondary response"));
 326                 return 0; /* we are done */
 327         } else /* more responses to go */
 328                 return 1;
 329
 330 }
 331
 332 static int
 333 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 334 {
 335         int length;
 336         unsigned int pdu_length, total_read;
 337         struct smb_hdr *smb_buffer = NULL;
 338         struct smb_hdr *bigbuf = NULL;
 339         struct smb_hdr *smallbuf = NULL;
 340         struct msghdr smb_msg;
 341         struct kvec iov;
 342         struct socket *csocket = server->ssocket;
 343         struct list_head *tmp;
 344         struct cifsSesInfo *ses;
 345         struct task_struct *task_to_wake = NULL;
 346         struct mid_q_entry *mid_entry;
 347         char temp;
 348         int isLargeBuf = FALSE;
 349         int isMultiRsp;
 350         int reconnect;
 351
 352         current->flags |= PF_MEMALLOC;
 353         server->tsk = current;  /* save process info to wake at shutdown */
 354         cFYI(1, ("Demultiplex PID: %d", current->pid));
 355         write_lock(&GlobalSMBSeslock);
 356         atomic_inc(&tcpSesAllocCount);
 357         length = tcpSesAllocCount.counter;
 358         write_unlock(&GlobalSMBSeslock);
 359         complete(&cifsd_complete);
 360         if (length  > 1)
 361                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 362                                 GFP_KERNEL);
 363
 364         set_freezable();
 365         while (!kthread_should_stop()) {
 366                 if (try_to_freeze())
 367                         continue;
 368                 if (bigbuf == NULL) {
 369                         bigbuf = cifs_buf_get();
 370                         if (!bigbuf) {
 371                                 cERROR(1, ("No memory for large SMB response"));
 372                                 msleep(3000);
 373                                 /* retry will check if exiting */
 374                                 continue;
 375                         }
 376                 } else if (isLargeBuf) {
 377                         /* we are reusing a dirty large buf, clear its start */
 378                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 379                 }
 380
 381                 if (smallbuf == NULL) {
 382                         smallbuf = cifs_small_buf_get();
 383                         if (!smallbuf) {
 384                                 cERROR(1, ("No memory for SMB response"));
 385                                 msleep(1000);
 386                                 /* retry will check if exiting */
 387                                 continue;
 388                         }
 389                         /* beginning of smb buffer is cleared in our buf_get */
 390                 } else /* if existing small buf clear beginning */
 391                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 392
 393                 isLargeBuf = FALSE;
 394                 isMultiRsp = FALSE;
 395                 smb_buffer = smallbuf;
 396                 iov.iov_base = smb_buffer;
 397                 iov.iov_len = 4;
 398                 smb_msg.msg_control = NULL;
 399                 smb_msg.msg_controllen = 0;
 400                 pdu_length = 4; /* enough to get RFC1001 header */
 401 incomplete_rcv:
 402                 length =
 403                     kernel_recvmsg(csocket, &smb_msg,
 404                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 405
 406                 if (kthread_should_stop()) {
 407                         break;
 408                 } else if (server->tcpStatus == CifsNeedReconnect) {
 409                         cFYI(1, ("Reconnect after server stopped responding"));
 410                         cifs_reconnect(server);
 411                         cFYI(1, ("call to reconnect done"));
 412                         csocket = server->ssocket;
 413                         continue;
 414                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 415                         msleep(1); /* minimum sleep to prevent looping
 416                                 allowing socket to clear and app threads to set
 417                                 tcpStatus CifsNeedReconnect if server hung */
 418                         continue;
 419                 } else if (length <= 0) {
 420                         if (server->tcpStatus == CifsNew) {
 421                                 cFYI(1, ("tcp session abend after SMBnegprot"));
 422                                 /* some servers kill the TCP session rather than
 423                                    returning an SMB negprot error, in which
 424                                    case reconnecting here is not going to help,
 425                                    and so simply return error to mount */
 426                                 break;
 427                         }
 428                         if (!try_to_freeze() && (length == -EINTR)) {
 429                                 cFYI(1, ("cifsd thread killed"));
 430                                 break;
 431                         }
 432                         cFYI(1, ("Reconnect after unexpected peek error %d",
 433                                 length));
 434                         cifs_reconnect(server);
 435                         csocket = server->ssocket;
 436                         wake_up(&server->response_q);
 437                         continue;
 438                 } else if (length < 4) {
 439                         cFYI(1, ("less than four bytes received (%d bytes)",
 440                               length));
 441                         pdu_length -= length;
 442                         msleep(1);
 443                         goto incomplete_rcv;
 444                 }
 445
 446                 /* The right amount was read from socket - 4 bytes */
 447                 /* so we can now interpret the length field */
 448
 449                 /* the first byte big endian of the length field,
 450                 is actually not part of the length but the type
 451                 with the most common, zero, as regular data */
 452                 temp = *((char *) smb_buffer);
 453
 454                 /* Note that FC 1001 length is big endian on the wire,
 455                 but we convert it here so it is always manipulated
 456                 as host byte order */
 457                 pdu_length = ntohl(smb_buffer->smb_buf_length);
 458                 smb_buffer->smb_buf_length = pdu_length;
 459
 460                 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
 461
 462                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 463                         continue;
 464                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 465                         cFYI(1, ("Good RFC 1002 session rsp"));
 466                         continue;
 467                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 468                         /* we get this from Windows 98 instead of
 469                            an error on SMB negprot response */
 470                         cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
 471                                 pdu_length));
 472                         if (server->tcpStatus == CifsNew) {
 473                                 /* if nack on negprot (rather than
 474                                 ret of smb negprot error) reconnecting
 475                                 not going to help, ret error to mount */
 476                                 break;
 477                         } else {
 478                                 /* give server a second to
 479                                 clean up before reconnect attempt */
 480                                 msleep(1000);
 481                                 /* always try 445 first on reconnect
 482                                 since we get NACK on some if we ever
 483                                 connected to port 139 (the NACK is
 484                                 since we do not begin with RFC1001
 485                                 session initialize frame) */
 486                                 server->addr.sockAddr.sin_port =
 487                                         htons(CIFS_PORT);
 488                                 cifs_reconnect(server);
 489                                 csocket = server->ssocket;
 490                                 wake_up(&server->response_q);
 491                                 continue;
 492                         }
 493                 } else if (temp != (char) 0) {
 494                         cERROR(1, ("Unknown RFC 1002 frame"));
 495                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 496                                       length);
 497                         cifs_reconnect(server);
 498                         csocket = server->ssocket;
 499                         continue;
 500                 }
 501
 502                 /* else we have an SMB response */
 503                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 504                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 505                         cERROR(1, ("Invalid size SMB length %d pdu_length %d",
 506                                         length, pdu_length+4));
 507                         cifs_reconnect(server);
 508                         csocket = server->ssocket;
 509                         wake_up(&server->response_q);
 510                         continue;
 511                 }
 512
 513                 /* else length ok */
 514                 reconnect = 0;
 515
 516                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 517                         isLargeBuf = TRUE;
 518                         memcpy(bigbuf, smallbuf, 4);
 519                         smb_buffer = bigbuf;
 520                 }
 521                 length = 0;
 522                 iov.iov_base = 4 + (char *)smb_buffer;
 523                 iov.iov_len = pdu_length;
 524                 for (total_read = 0; total_read < pdu_length;
 525                      total_read += length) {
 526                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 527                                                 pdu_length - total_read, 0);
 528                         if (kthread_should_stop() ||
 529                             (length == -EINTR)) {
 530                                 /* then will exit */
 531                                 reconnect = 2;
 532                                 break;
 533                         } else if (server->tcpStatus == CifsNeedReconnect) {
 534                                 cifs_reconnect(server);
 535                                 csocket = server->ssocket;
 536                                 /* Reconnect wakes up rspns q */
 537                                 /* Now we will reread sock */
 538                                 reconnect = 1;
 539                                 break;
 540                         } else if ((length == -ERESTARTSYS) ||
 541                                    (length == -EAGAIN)) {
 542                                 msleep(1); /* minimum sleep to prevent looping,
 543                                               allowing socket to clear and app
 544                                               threads to set tcpStatus
 545                                               CifsNeedReconnect if server hung*/
 546                                 continue;
 547                         } else if (length <= 0) {
 548                                 cERROR(1, ("Received no data, expecting %d",
 549                                               pdu_length - total_read));
 550                                 cifs_reconnect(server);
 551                                 csocket = server->ssocket;
 552                                 reconnect = 1;
 553                                 break;
 554                         }
 555                 }
 556                 if (reconnect == 2)
 557                         break;
 558                 else if (reconnect == 1)
 559                         continue;
 560
 561                 length += 4; /* account for rfc1002 hdr */
 562
 563
 564                 dump_smb(smb_buffer, length);
 565                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 566                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 567                         continue;
 568                 }
 569
 570
 571                 task_to_wake = NULL;
 572                 spin_lock(&GlobalMid_Lock);
 573                 list_for_each(tmp, &server->pending_mid_q) {
 574                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 575
 576                         if ((mid_entry->mid == smb_buffer->Mid) &&
 577                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 578                             (mid_entry->command == smb_buffer->Command)) {
 579                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 580                                         /* We have a multipart transact2 resp */
 581                                         isMultiRsp = TRUE;
 582                                         if (mid_entry->resp_buf) {
 583                                                 /* merge response - fix up 1st*/
 584                                                 if (coalesce_t2(smb_buffer,
 585                                                         mid_entry->resp_buf)) {
 586                                                         mid_entry->multiRsp = 1;
 587                                                         break;
 588                                                 } else {
 589                                                         /* all parts received */
 590                                                         mid_entry->multiEnd = 1;
 591                                                         goto multi_t2_fnd;
 592                                                 }
 593                                         } else {
 594                                                 if (!isLargeBuf) {
 595                                                         cERROR(1,("1st trans2 resp needs bigbuf"));
 596                                         /* BB maybe we can fix this up,  switch
 597                                            to already allocated large buffer? */
 598                                                 } else {
 599                                                         /* Have first buffer */
 600                                                         mid_entry->resp_buf =
 601                                                                  smb_buffer;
 602                                                         mid_entry->largeBuf = 1;
 603                                                         bigbuf = NULL;
 604                                                 }
 605                                         }
 606                                         break;
 607                                 }
 608                                 mid_entry->resp_buf = smb_buffer;
 609                                 if (isLargeBuf)
 610                                         mid_entry->largeBuf = 1;
 611                                 else
 612                                         mid_entry->largeBuf = 0;
 613 multi_t2_fnd:
 614                                 task_to_wake = mid_entry->tsk;
 615                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 616 #ifdef CONFIG_CIFS_STATS2
 617                                 mid_entry->when_received = jiffies;
 618 #endif
 619                                 /* so we do not time out requests to  server
 620                                 which is still responding (since server could
 621                                 be busy but not dead) */
 622                                 server->lstrp = jiffies;
 623                                 break;
 624                         }
 625                 }
 626                 spin_unlock(&GlobalMid_Lock);
 627                 if (task_to_wake) {
 628                         /* Was previous buf put in mpx struct for multi-rsp? */
 629                         if (!isMultiRsp) {
 630                                 /* smb buffer will be freed by user thread */
 631                                 if (isLargeBuf)
 632                                         bigbuf = NULL;
 633                                 else
 634                                         smallbuf = NULL;
 635                         }
 636                         wake_up_process(task_to_wake);
 637                 } else if ((is_valid_oplock_break(smb_buffer, server) == FALSE)
 638                     && (isMultiRsp == FALSE)) {
 639                         cERROR(1, ("No task to wake, unknown frame received! "
 640                                    "NumMids %d", midCount.counter));
 641                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 642                                       sizeof(struct smb_hdr));
 643 #ifdef CONFIG_CIFS_DEBUG2
 644                         cifs_dump_detail(smb_buffer);
 645                         cifs_dump_mids(server);
 646 #endif /* CIFS_DEBUG2 */
 647
 648                 }
 649         } /* end while !EXITING */
 650
 651         spin_lock(&GlobalMid_Lock);
 652         server->tcpStatus = CifsExiting;
 653         server->tsk = NULL;
 654         /* check if we have blocked requests that need to free */
 655         /* Note that cifs_max_pending is normally 50, but
 656         can be set at module install time to as little as two */
 657         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 658                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 659         /* We do not want to set the max_pending too low or we
 660         could end up with the counter going negative */
 661         spin_unlock(&GlobalMid_Lock);
 662         /* Although there should not be any requests blocked on
 663         this queue it can not hurt to be paranoid and try to wake up requests
 664         that may haven been blocked when more than 50 at time were on the wire
 665         to the same server - they now will see the session is in exit state
 666         and get out of SendReceive.  */
 667         wake_up_all(&server->request_q);
 668         /* give those requests time to exit */
 669         msleep(125);
 670
 671         if (server->ssocket) {
 672                 sock_release(csocket);
 673                 server->ssocket = NULL;
 674         }
 675         /* buffer usuallly freed in free_mid - need to free it here on exit */
 676         if (bigbuf != NULL)
 677                 cifs_buf_release(bigbuf);
 678         if (smallbuf != NULL)
 679                 cifs_small_buf_release(smallbuf);
 680
 681         read_lock(&GlobalSMBSeslock);
 682         if (list_empty(&server->pending_mid_q)) {
 683                 /* loop through server session structures attached to this and
 684                     mark them dead */
 685                 list_for_each(tmp, &GlobalSMBSessionList) {
 686                         ses =
 687                             list_entry(tmp, struct cifsSesInfo,
 688                                        cifsSessionList);
 689                         if (ses->server == server) {
 690                                 ses->status = CifsExiting;
 691                                 ses->server = NULL;
 692                         }
 693                 }
 694                 read_unlock(&GlobalSMBSeslock);
 695         } else {
 696                 /* although we can not zero the server struct pointer yet,
 697                 since there are active requests which may depnd on them,
 698                 mark the corresponding SMB sessions as exiting too */
 699                 list_for_each(tmp, &GlobalSMBSessionList) {
 700                         ses = list_entry(tmp, struct cifsSesInfo,
 701                                          cifsSessionList);
 702                         if (ses->server == server)
 703                                 ses->status = CifsExiting;
 704                 }
 705
 706                 spin_lock(&GlobalMid_Lock);
 707                 list_for_each(tmp, &server->pending_mid_q) {
 708                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 709                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 710                                 cFYI(1, ("Clearing Mid 0x%x - waking up ",
 711                                          mid_entry->mid));
 712                                 task_to_wake = mid_entry->tsk;
 713                                 if (task_to_wake)
 714                                         wake_up_process(task_to_wake);
 715                         }
 716                 }
 717                 spin_unlock(&GlobalMid_Lock);
 718                 read_unlock(&GlobalSMBSeslock);
 719                 /* 1/8th of sec is more than enough time for them to exit */
 720                 msleep(125);
 721         }
 722
 723         if (!list_empty(&server->pending_mid_q)) {
 724                 /* mpx threads have not exited yet give them
 725                 at least the smb send timeout time for long ops */
 726                 /* due to delays on oplock break requests, we need
 727                 to wait at least 45 seconds before giving up
 728                 on a request getting a response and going ahead
 729                 and killing cifsd */
 730                 cFYI(1, ("Wait for exit from demultiplex thread"));
 731                 msleep(46000);
 732                 /* if threads still have not exited they are probably never
 733                 coming home not much else we can do but free the memory */
 734         }
 735
 736         write_lock(&GlobalSMBSeslock);
 737         atomic_dec(&tcpSesAllocCount);
 738         length = tcpSesAllocCount.counter;
 739
 740         /* last chance to mark ses pointers invalid
 741         if there are any pointing to this (e.g
 742         if a crazy root user tried to kill cifsd
 743         kernel thread explicitly this might happen) */
 744         list_for_each(tmp, &GlobalSMBSessionList) {
 745                 ses = list_entry(tmp, struct cifsSesInfo,
 746                                 cifsSessionList);
 747                 if (ses->server == server)
 748                         ses->server = NULL;
 749         }
 750         write_unlock(&GlobalSMBSeslock);
 751
 752         kfree(server);
 753         if (length  > 0)
 754                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 755                                 GFP_KERNEL);
 756
 757         return 0;
 758 }
 759
 760 static int
 761 cifs_parse_mount_options(char *options, const char *devname,
 762                          struct smb_vol *vol)
 763 {
 764         char *value;
 765         char *data;
 766         unsigned int  temp_len, i, j;
 767         char separator[2];
 768
 769         separator[0] = ',';
 770         separator[1] = 0;
 771
 772         if (Local_System_Name[0] != 0)
 773                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 774         else {
 775                 char *nodename = utsname()->nodename;
 776                 int n = strnlen(nodename, 15);
 777                 memset(vol->source_rfc1001_name, 0x20, 15);
 778                 for (i = 0; i < n; i++) {
 779                         /* does not have to be perfect mapping since field is
 780                         informational, only used for servers that do not support
 781                         port 445 and it can be overridden at mount time */
 782                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 783                 }
 784         }
 785         vol->source_rfc1001_name[15] = 0;
 786         /* null target name indicates to use *SMBSERVR default called name
 787            if we end up sending RFC1001 session initialize */
 788         vol->target_rfc1001_name[0] = 0;
 789         vol->linux_uid = current->uid;  /* current->euid instead? */
 790         vol->linux_gid = current->gid;
 791         vol->dir_mode = S_IRWXUGO;
 792         /* 2767 perms indicate mandatory locking support */
 793         vol->file_mode = S_IALLUGO & ~(S_ISUID | S_IXGRP);
 794
 795         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 796         vol->rw = TRUE;
 797         /* default is always to request posix paths. */
 798         vol->posix_paths = 1;
 799
 800         if (!options)
 801                 return 1;
 802
 803         if (strncmp(options, "sep=", 4) == 0) {
 804                 if (options[4] != 0) {
 805                         separator[0] = options[4];
 806                         options += 5;
 807                 } else {
 808                         cFYI(1, ("Null separator not allowed"));
 809                 }
 810         }
 811
 812         while ((data = strsep(&options, separator)) != NULL) {
 813                 if (!*data)
 814                         continue;
 815                 if ((value = strchr(data, '=')) != NULL)
 816                         *value++ = '\0';
 817
 818                 /* Have to parse this before we parse for "user" */
 819                 if (strnicmp(data, "user_xattr", 10) == 0) {
 820                         vol->no_xattr = 0;
 821                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 822                         vol->no_xattr = 1;
 823                 } else if (strnicmp(data, "user", 4) == 0) {
 824                         if (!value) {
 825                                 printk(KERN_WARNING
 826                                        "CIFS: invalid or missing username\n");
 827                                 return 1;       /* needs_arg; */
 828                         } else if (!*value) {
 829                                 /* null user, ie anonymous, authentication */
 830                                 vol->nullauth = 1;
 831                         }
 832                         if (strnlen(value, 200) < 200) {
 833                                 vol->username = value;
 834                         } else {
 835                                 printk(KERN_WARNING "CIFS: username too long\n");
 836                                 return 1;
 837                         }
 838                 } else if (strnicmp(data, "pass", 4) == 0) {
 839                         if (!value) {
 840                                 vol->password = NULL;
 841                                 continue;
 842                         } else if (value[0] == 0) {
 843                                 /* check if string begins with double comma
 844                                    since that would mean the password really
 845                                    does start with a comma, and would not
 846                                    indicate an empty string */
 847                                 if (value[1] != separator[0]) {
 848                                         vol->password = NULL;
 849                                         continue;
 850                                 }
 851                         }
 852                         temp_len = strlen(value);
 853                         /* removed password length check, NTLM passwords
 854                                 can be arbitrarily long */
 855
 856                         /* if comma in password, the string will be
 857                         prematurely null terminated.  Commas in password are
 858                         specified across the cifs mount interface by a double
 859                         comma ie ,, and a comma used as in other cases ie ','
 860                         as a parameter delimiter/separator is single and due
 861                         to the strsep above is temporarily zeroed. */
 862
 863                         /* NB: password legally can have multiple commas and
 864                         the only illegal character in a password is null */
 865
 866                         if ((value[temp_len] == 0) &&
 867                             (value[temp_len+1] == separator[0])) {
 868                                 /* reinsert comma */
 869                                 value[temp_len] = separator[0];
 870                                 temp_len += 2;  /* move after second comma */
 871                                 while (value[temp_len] != 0)  {
 872                                         if (value[temp_len] == separator[0]) {
 873                                                 if (value[temp_len+1] ==
 874                                                      separator[0]) {
 875                                                 /* skip second comma */
 876                                                         temp_len++;
 877                                                 } else {
 878                                                 /* single comma indicating start
 879                                                          of next parm */
 880                                                         break;
 881                                                 }
 882                                         }
 883                                         temp_len++;
 884                                 }
 885                                 if (value[temp_len] == 0) {
 886                                         options = NULL;
 887                                 } else {
 888                                         value[temp_len] = 0;
 889                                         /* point option to start of next parm */
 890                                         options = value + temp_len + 1;
 891                                 }
 892                                 /* go from value to value + temp_len condensing
 893                                 double commas to singles. Note that this ends up
 894                                 allocating a few bytes too many, which is ok */
 895                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 896                                 if (vol->password == NULL) {
 897                                         printk(KERN_WARNING "CIFS: no memory "
 898                                                             "for password\n");
 899                                         return 1;
 900                                 }
 901                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 902                                         vol->password[j] = value[i];
 903                                         if (value[i] == separator[0]
 904                                                 && value[i+1] == separator[0]) {
 905                                                 /* skip second comma */
 906                                                 i++;
 907                                         }
 908                                 }
 909                                 vol->password[j] = 0;
 910                         } else {
 911                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 912                                 if (vol->password == NULL) {
 913                                         printk(KERN_WARNING "CIFS: no memory "
 914                                                             "for password\n");
 915                                         return 1;
 916                                 }
 917                                 strcpy(vol->password, value);
 918                         }
 919                 } else if (strnicmp(data, "ip", 2) == 0) {
 920                         if (!value || !*value) {
 921                                 vol->UNCip = NULL;
 922                         } else if (strnlen(value, 35) < 35) {
 923                                 vol->UNCip = value;
 924                         } else {
 925                                 printk(KERN_WARNING "CIFS: ip address "
 926                                                     "too long\n");
 927                                 return 1;
 928                         }
 929                 } else if (strnicmp(data, "sec", 3) == 0) {
 930                         if (!value || !*value) {
 931                                 cERROR(1, ("no security value specified"));
 932                                 continue;
 933                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 934                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 935                                         CIFSSEC_MUST_SIGN;
 936                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 937                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 938                                         CIFSSEC_MAY_KRB5; */
 939                                 cERROR(1, ("Krb5 cifs privacy not supported"));
 940                                 return 1;
 941                         } else if (strnicmp(value, "krb5", 4) == 0) {
 942                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 943                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 944                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 945                                         CIFSSEC_MUST_SIGN;
 946                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
 947                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 948                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
 949                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
 950                                         CIFSSEC_MUST_SIGN;
 951                         } else if (strnicmp(value, "ntlm", 4) == 0) {
 952                                 /* ntlm is default so can be turned off too */
 953                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
 954                         } else if (strnicmp(value, "nontlm", 6) == 0) {
 955                                 /* BB is there a better way to do this? */
 956                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
 957 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 958                         } else if (strnicmp(value, "lanman", 6) == 0) {
 959                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
 960 #endif
 961                         } else if (strnicmp(value, "none", 4) == 0) {
 962                                 vol->nullauth = 1;
 963                         } else {
 964                                 cERROR(1, ("bad security option: %s", value));
 965                                 return 1;
 966                         }
 967                 } else if ((strnicmp(data, "unc", 3) == 0)
 968                            || (strnicmp(data, "target", 6) == 0)
 969                            || (strnicmp(data, "path", 4) == 0)) {
 970                         if (!value || !*value) {
 971                                 printk(KERN_WARNING "CIFS: invalid path to "
 972                                                     "network resource\n");
 973                                 return 1;       /* needs_arg; */
 974                         }
 975                         if ((temp_len = strnlen(value, 300)) < 300) {
 976                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
 977                                 if (vol->UNC == NULL)
 978                                         return 1;
 979                                 strcpy(vol->UNC, value);
 980                                 if (strncmp(vol->UNC, "//", 2) == 0) {
 981                                         vol->UNC[0] = '\\';
 982                                         vol->UNC[1] = '\\';
 983                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
 984                                         printk(KERN_WARNING
 985                                                "CIFS: UNC Path does not begin "
 986                                                "with // or \\\\ \n");
 987                                         return 1;
 988                                 }
 989                         } else {
 990                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
 991                                 return 1;
 992                         }
 993                 } else if ((strnicmp(data, "domain", 3) == 0)
 994                            || (strnicmp(data, "workgroup", 5) == 0)) {
 995                         if (!value || !*value) {
 996                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
 997                                 return 1;       /* needs_arg; */
 998                         }
 999                         /* BB are there cases in which a comma can be valid in
1000                         a domain name and need special handling? */
1001                         if (strnlen(value, 256) < 256) {
1002                                 vol->domainname = value;
1003                                 cFYI(1, ("Domain name set"));
1004                         } else {
1005                                 printk(KERN_WARNING "CIFS: domain name too "
1006                                                     "long\n");
1007                                 return 1;
1008                         }
1009                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1010                         if (!value || !*value) {
1011                                 printk(KERN_WARNING
1012                                         "CIFS: invalid path prefix\n");
1013                                 return 1;       /* needs_argument */
1014                         }
1015                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1016                                 if (value[0] != '/')
1017                                         temp_len++;  /* missing leading slash */
1018                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1019                                 if (vol->prepath == NULL)
1020                                         return 1;
1021                                 if (value[0] != '/') {
1022                                         vol->prepath[0] = '/';
1023                                         strcpy(vol->prepath+1, value);
1024                                 } else
1025                                         strcpy(vol->prepath, value);
1026                                 cFYI(1, ("prefix path %s", vol->prepath));
1027                         } else {
1028                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1029                                 return 1;
1030                         }
1031                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1032                         if (!value || !*value) {
1033                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1034                                                     "specified\n");
1035                                 return 1;       /* needs_arg; */
1036                         }
1037                         if (strnlen(value, 65) < 65) {
1038                                 if (strnicmp(value, "default", 7))
1039                                         vol->iocharset = value;
1040                                 /* if iocharset not set then load_nls_default
1041                                    is used by caller */
1042                                 cFYI(1, ("iocharset set to %s", value));
1043                         } else {
1044                                 printk(KERN_WARNING "CIFS: iocharset name "
1045                                                     "too long.\n");
1046                                 return 1;
1047                         }
1048                 } else if (strnicmp(data, "uid", 3) == 0) {
1049                         if (value && *value) {
1050                                 vol->linux_uid =
1051                                         simple_strtoul(value, &value, 0);
1052                                 vol->override_uid = 1;
1053                         }
1054                 } else if (strnicmp(data, "gid", 3) == 0) {
1055                         if (value && *value) {
1056                                 vol->linux_gid =
1057                                         simple_strtoul(value, &value, 0);
1058                                 vol->override_gid = 1;
1059                         }
1060                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1061                         if (value && *value) {
1062                                 vol->file_mode =
1063                                         simple_strtoul(value, &value, 0);
1064                         }
1065                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1066                         if (value && *value) {
1067                                 vol->dir_mode =
1068                                         simple_strtoul(value, &value, 0);
1069                         }
1070                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1071                         if (value && *value) {
1072                                 vol->dir_mode =
1073                                         simple_strtoul(value, &value, 0);
1074                         }
1075                 } else if (strnicmp(data, "port", 4) == 0) {
1076                         if (value && *value) {
1077                                 vol->port =
1078                                         simple_strtoul(value, &value, 0);
1079                         }
1080                 } else if (strnicmp(data, "rsize", 5) == 0) {
1081                         if (value && *value) {
1082                                 vol->rsize =
1083                                         simple_strtoul(value, &value, 0);
1084                         }
1085                 } else if (strnicmp(data, "wsize", 5) == 0) {
1086                         if (value && *value) {
1087                                 vol->wsize =
1088                                         simple_strtoul(value, &value, 0);
1089                         }
1090                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1091                         if (value && *value) {
1092                                 vol->sockopt =
1093                                         simple_strtoul(value, &value, 0);
1094                         }
1095                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1096                         if (!value || !*value || (*value == ' ')) {
1097                                 cFYI(1, ("invalid (empty) netbiosname"));
1098                         } else {
1099                                 memset(vol->source_rfc1001_name, 0x20, 15);
1100                                 for (i = 0; i < 15; i++) {
1101                                 /* BB are there cases in which a comma can be
1102                                 valid in this workstation netbios name (and need
1103                                 special handling)? */
1104
1105                                 /* We do not uppercase netbiosname for user */
1106                                         if (value[i] == 0)
1107                                                 break;
1108                                         else
1109                                                 vol->source_rfc1001_name[i] =
1110                                                                 value[i];
1111                                 }
1112                                 /* The string has 16th byte zero still from
1113                                 set at top of the function  */
1114                                 if ((i == 15) && (value[i] != 0))
1115                                         printk(KERN_WARNING "CIFS: netbiosname"
1116                                                 " longer than 15 truncated.\n");
1117                         }
1118                 } else if (strnicmp(data, "servern", 7) == 0) {
1119                         /* servernetbiosname specified override *SMBSERVER */
1120                         if (!value || !*value || (*value == ' ')) {
1121                                 cFYI(1, ("empty server netbiosname specified"));
1122                         } else {
1123                                 /* last byte, type, is 0x20 for servr type */
1124                                 memset(vol->target_rfc1001_name, 0x20, 16);
1125
1126                                 for (i = 0; i < 15; i++) {
1127                                 /* BB are there cases in which a comma can be
1128                                    valid in this workstation netbios name
1129                                    (and need special handling)? */
1130
1131                                 /* user or mount helper must uppercase
1132                                    the netbiosname */
1133                                         if (value[i] == 0)
1134                                                 break;
1135                                         else
1136                                                 vol->target_rfc1001_name[i] =
1137                                                                 value[i];
1138                                 }
1139                                 /* The string has 16th byte zero still from
1140                                    set at top of the function  */
1141                                 if ((i == 15) && (value[i] != 0))
1142                                         printk(KERN_WARNING "CIFS: server net"
1143                                         "biosname longer than 15 truncated.\n");
1144                         }
1145                 } else if (strnicmp(data, "credentials", 4) == 0) {
1146                         /* ignore */
1147                 } else if (strnicmp(data, "version", 3) == 0) {
1148                         /* ignore */
1149                 } else if (strnicmp(data, "guest", 5) == 0) {
1150                         /* ignore */
1151                 } else if (strnicmp(data, "rw", 2) == 0) {
1152                         vol->rw = TRUE;
1153                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1154                                    (strnicmp(data, "nosuid", 6) == 0) ||
1155                                    (strnicmp(data, "exec", 4) == 0) ||
1156                                    (strnicmp(data, "noexec", 6) == 0) ||
1157                                    (strnicmp(data, "nodev", 5) == 0) ||
1158                                    (strnicmp(data, "noauto", 6) == 0) ||
1159                                    (strnicmp(data, "dev", 3) == 0)) {
1160                         /*  The mount tool or mount.cifs helper (if present)
1161                             uses these opts to set flags, and the flags are read
1162                             by the kernel vfs layer before we get here (ie
1163                             before read super) so there is no point trying to
1164                             parse these options again and set anything and it
1165                             is ok to just ignore them */
1166                         continue;
1167                 } else if (strnicmp(data, "ro", 2) == 0) {
1168                         vol->rw = FALSE;
1169                 } else if (strnicmp(data, "hard", 4) == 0) {
1170                         vol->retry = 1;
1171                 } else if (strnicmp(data, "soft", 4) == 0) {
1172                         vol->retry = 0;
1173                 } else if (strnicmp(data, "perm", 4) == 0) {
1174                         vol->noperm = 0;
1175                 } else if (strnicmp(data, "noperm", 6) == 0) {
1176                         vol->noperm = 1;
1177                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1178                         vol->remap = 1;
1179                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1180                         vol->remap = 0;
1181                 } else if (strnicmp(data, "sfu", 3) == 0) {
1182                         vol->sfu_emul = 1;
1183                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1184                         vol->sfu_emul = 0;
1185                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1186                         vol->posix_paths = 1;
1187                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1188                         vol->posix_paths = 0;
1189                 } else if (strnicmp(data, "nounix", 6) == 0) {
1190                         vol->no_linux_ext = 1;
1191                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1192                         vol->no_linux_ext = 1;
1193                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1194                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1195                         vol->nocase = 1;
1196                 } else if (strnicmp(data, "brl", 3) == 0) {
1197                         vol->nobrl =  0;
1198                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1199                            (strnicmp(data, "nolock", 6) == 0)) {
1200                         vol->nobrl =  1;
1201                         /* turn off mandatory locking in mode
1202                         if remote locking is turned off since the
1203                         local vfs will do advisory */
1204                         if (vol->file_mode ==
1205                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1206                                 vol->file_mode = S_IALLUGO;
1207                 } else if (strnicmp(data, "setuids", 7) == 0) {
1208                         vol->setuids = 1;
1209                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1210                         vol->setuids = 0;
1211                 } else if (strnicmp(data, "nohard", 6) == 0) {
1212                         vol->retry = 0;
1213                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1214                         vol->retry = 1;
1215                 } else if (strnicmp(data, "nointr", 6) == 0) {
1216                         vol->intr = 0;
1217                 } else if (strnicmp(data, "intr", 4) == 0) {
1218                         vol->intr = 1;
1219                 } else if (strnicmp(data, "serverino", 7) == 0) {
1220                         vol->server_ino = 1;
1221                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1222                         vol->server_ino = 0;
1223                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1224                         vol->cifs_acl = 1;
1225                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1226                         vol->cifs_acl = 0;
1227                 } else if (strnicmp(data, "acl", 3) == 0) {
1228                         vol->no_psx_acl = 0;
1229                 } else if (strnicmp(data, "noacl", 5) == 0) {
1230                         vol->no_psx_acl = 1;
1231                 } else if (strnicmp(data, "sign", 4) == 0) {
1232                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1233 /*              } else if (strnicmp(data, "seal",4) == 0) {
1234                         vol->secFlg |= CIFSSEC_MUST_SEAL; */
1235                 } else if (strnicmp(data, "direct", 6) == 0) {
1236                         vol->direct_io = 1;
1237                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1238                         vol->direct_io = 1;
1239                 } else if (strnicmp(data, "in6_addr", 8) == 0) {
1240                         if (!value || !*value) {
1241                                 vol->in6_addr = NULL;
1242                         } else if (strnlen(value, 49) == 48) {
1243                                 vol->in6_addr = value;
1244                         } else {
1245                                 printk(KERN_WARNING "CIFS: ip v6 address not "
1246                                                     "48 characters long\n");
1247                                 return 1;
1248                         }
1249                 } else if (strnicmp(data, "noac", 4) == 0) {
1250                         printk(KERN_WARNING "CIFS: Mount option noac not "
1251                                 "supported. Instead set "
1252                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1253                 } else
1254                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1255                                                 data);
1256         }
1257         if (vol->UNC == NULL) {
1258                 if (devname == NULL) {
1259                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1260                                                 "target\n");
1261                         return 1;
1262                 }
1263                 if ((temp_len = strnlen(devname, 300)) < 300) {
1264                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1265                         if (vol->UNC == NULL)
1266                                 return 1;
1267                         strcpy(vol->UNC, devname);
1268                         if (strncmp(vol->UNC, "//", 2) == 0) {
1269                                 vol->UNC[0] = '\\';
1270                                 vol->UNC[1] = '\\';
1271                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1272                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1273                                                     "begin with // or \\\\ \n");
1274                                 return 1;
1275                         }
1276                 } else {
1277                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1278                         return 1;
1279                 }
1280         }
1281         if (vol->UNCip == NULL)
1282                 vol->UNCip = &vol->UNC[2];
1283
1284         return 0;
1285 }
1286
1287 static struct cifsSesInfo *
1288 cifs_find_tcp_session(struct in_addr *target_ip_addr,
1289                 struct in6_addr *target_ip6_addr,
1290                  char *userName, struct TCP_Server_Info **psrvTcp)
1291 {
1292         struct list_head *tmp;
1293         struct cifsSesInfo *ses;
1294         *psrvTcp = NULL;
1295         read_lock(&GlobalSMBSeslock);
1296
1297         list_for_each(tmp, &GlobalSMBSessionList) {
1298                 ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
1299                 if (ses->server) {
1300                         if ((target_ip_addr &&
1301                                 (ses->server->addr.sockAddr.sin_addr.s_addr
1302                                   == target_ip_addr->s_addr)) || (target_ip6_addr
1303                                 && memcmp(&ses->server->addr.sockAddr6.sin6_addr,
1304                                         target_ip6_addr, sizeof(*target_ip6_addr)))) {
1305                                 /* BB lock server and tcp session and increment
1306                                       use count here?? */
1307
1308                                 /* found a match on the TCP session */
1309                                 *psrvTcp = ses->server;
1310
1311                                 /* BB check if reconnection needed */
1312                                 if (strncmp
1313                                     (ses->userName, userName,
1314                                      MAX_USERNAME_SIZE) == 0){
1315                                         read_unlock(&GlobalSMBSeslock);
1316                                         /* Found exact match on both TCP and
1317                                            SMB sessions */
1318                                         return ses;
1319                                 }
1320                         }
1321                 }
1322                 /* else tcp and smb sessions need reconnection */
1323         }
1324         read_unlock(&GlobalSMBSeslock);
1325         return NULL;
1326 }
1327
1328 static struct cifsTconInfo *
1329 find_unc(__be32 new_target_ip_addr, char *uncName, char *userName)
1330 {
1331         struct list_head *tmp;
1332         struct cifsTconInfo *tcon;
1333
1334         read_lock(&GlobalSMBSeslock);
1335         list_for_each(tmp, &GlobalTreeConnectionList) {
1336                 cFYI(1, ("Next tcon"));
1337                 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
1338                 if (tcon->ses) {
1339                         if (tcon->ses->server) {
1340                                 cFYI(1,
1341                                      ("old ip addr: %x == new ip %x ?",
1342                                       tcon->ses->server->addr.sockAddr.sin_addr.
1343                                       s_addr, new_target_ip_addr));
1344                                 if (tcon->ses->server->addr.sockAddr.sin_addr.
1345                                     s_addr == new_target_ip_addr) {
1346         /* BB lock tcon, server and tcp session and increment use count here? */
1347                                         /* found a match on the TCP session */
1348                                         /* BB check if reconnection needed */
1349                                         cFYI(1,
1350                                               ("IP match, old UNC: %s new: %s",
1351                                               tcon->treeName, uncName));
1352                                         if (strncmp
1353                                             (tcon->treeName, uncName,
1354                                              MAX_TREE_SIZE) == 0) {
1355                                                 cFYI(1,
1356                                                      ("and old usr: %s new: %s",
1357                                                       tcon->treeName, uncName));
1358                                                 if (strncmp
1359                                                     (tcon->ses->userName,
1360                                                      userName,
1361                                                      MAX_USERNAME_SIZE) == 0) {
1362                                                         read_unlock(&GlobalSMBSeslock);
1363                                                         /* matched smb session
1364                                                         (user name */
1365                                                         return tcon;
1366                                                 }
1367                                         }
1368                                 }
1369                         }
1370                 }
1371         }
1372         read_unlock(&GlobalSMBSeslock);
1373         return NULL;
1374 }
1375
1376 int
1377 connect_to_dfs_path(int xid, struct cifsSesInfo *pSesInfo,
1378                     const char *old_path, const struct nls_table *nls_codepage,
1379                     int remap)
1380 {
1381         unsigned char *referrals = NULL;
1382         unsigned int num_referrals;
1383         int rc = 0;
1384
1385         rc = get_dfs_path(xid, pSesInfo, old_path, nls_codepage,
1386                         &num_referrals, &referrals, remap);
1387
1388         /* BB Add in code to: if valid refrl, if not ip address contact
1389                 the helper that resolves tcp names, mount to it, try to
1390                 tcon to it unmount it if fail */
1391
1392         kfree(referrals);
1393
1394         return rc;
1395 }
1396
1397 int
1398 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1399              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1400              unsigned char **preferrals, int remap)
1401 {
1402         char *temp_unc;
1403         int rc = 0;
1404
1405         *pnum_referrals = 0;
1406
1407         if (pSesInfo->ipc_tid == 0) {
1408                 temp_unc = kmalloc(2 /* for slashes */ +
1409                         strnlen(pSesInfo->serverName,
1410                                 SERVER_NAME_LEN_WITH_NULL * 2)
1411                                  + 1 + 4 /* slash IPC$ */  + 2,
1412                                 GFP_KERNEL);
1413                 if (temp_unc == NULL)
1414                         return -ENOMEM;
1415                 temp_unc[0] = '\\';
1416                 temp_unc[1] = '\\';
1417                 strcpy(temp_unc + 2, pSesInfo->serverName);
1418                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1419                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1420                 cFYI(1,
1421                      ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1422                 kfree(temp_unc);
1423         }
1424         if (rc == 0)
1425                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1426                                      pnum_referrals, nls_codepage, remap);
1427
1428         return rc;
1429 }
1430
1431 /* See RFC1001 section 14 on representation of Netbios names */
1432 static void rfc1002mangle(char *target, char *source, unsigned int length)
1433 {
1434         unsigned int i, j;
1435
1436         for (i = 0, j = 0; i < (length); i++) {
1437                 /* mask a nibble at a time and encode */
1438                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1439                 target[j+1] = 'A' + (0x0F & source[i]);
1440                 j += 2;
1441         }
1442
1443 }
1444
1445
1446 static int
1447 ipv4_connect(struct sockaddr_in *psin_server, struct socket **csocket,
1448              char *netbios_name, char *target_name)
1449 {
1450         int rc = 0;
1451         int connected = 0;
1452         __be16 orig_port = 0;
1453
1454         if (*csocket == NULL) {
1455                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1456                                       IPPROTO_TCP, csocket);
1457                 if (rc < 0) {
1458                         cERROR(1, ("Error %d creating socket", rc));
1459                         *csocket = NULL;
1460                         return rc;
1461                 } else {
1462                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1463                         cFYI(1, ("Socket created"));
1464                         (*csocket)->sk->sk_allocation = GFP_NOFS;
1465                 }
1466         }
1467
1468         psin_server->sin_family = AF_INET;
1469         if (psin_server->sin_port) { /* user overrode default port */
1470                 rc = (*csocket)->ops->connect(*csocket,
1471                                 (struct sockaddr *) psin_server,
1472                                 sizeof (struct sockaddr_in), 0);
1473                 if (rc >= 0)
1474                         connected = 1;
1475         }
1476
1477         if (!connected) {
1478                 /* save original port so we can retry user specified port
1479                         later if fall back ports fail this time  */
1480                 orig_port = psin_server->sin_port;
1481
1482                 /* do not retry on the same port we just failed on */
1483                 if (psin_server->sin_port != htons(CIFS_PORT)) {
1484                         psin_server->sin_port = htons(CIFS_PORT);
1485
1486                         rc = (*csocket)->ops->connect(*csocket,
1487                                         (struct sockaddr *) psin_server,
1488                                         sizeof (struct sockaddr_in), 0);
1489                         if (rc >= 0)
1490                                 connected = 1;
1491                 }
1492         }
1493         if (!connected) {
1494                 psin_server->sin_port = htons(RFC1001_PORT);
1495                 rc = (*csocket)->ops->connect(*csocket, (struct sockaddr *)
1496                                               psin_server,
1497                                               sizeof (struct sockaddr_in), 0);
1498                 if (rc >= 0)
1499                         connected = 1;
1500         }
1501
1502         /* give up here - unless we want to retry on different
1503                 protocol families some day */
1504         if (!connected) {
1505                 if (orig_port)
1506                         psin_server->sin_port = orig_port;
1507                 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1508                 sock_release(*csocket);
1509                 *csocket = NULL;
1510                 return rc;
1511         }
1512         /* Eventually check for other socket options to change from
1513                 the default. sock_setsockopt not used because it expects
1514                 user space buffer */
1515          cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1516                  (*csocket)->sk->sk_sndbuf,
1517                  (*csocket)->sk->sk_rcvbuf, (*csocket)->sk->sk_rcvtimeo));
1518         (*csocket)->sk->sk_rcvtimeo = 7 * HZ;
1519         /* make the bufsizes depend on wsize/rsize and max requests */
1520         if ((*csocket)->sk->sk_sndbuf < (200 * 1024))
1521                 (*csocket)->sk->sk_sndbuf = 200 * 1024;
1522         if ((*csocket)->sk->sk_rcvbuf < (140 * 1024))
1523                 (*csocket)->sk->sk_rcvbuf = 140 * 1024;
1524
1525         /* send RFC1001 sessinit */
1526         if (psin_server->sin_port == htons(RFC1001_PORT)) {
1527                 /* some servers require RFC1001 sessinit before sending
1528                 negprot - BB check reconnection in case where second
1529                 sessinit is sent but no second negprot */
1530                 struct rfc1002_session_packet *ses_init_buf;
1531                 struct smb_hdr *smb_buf;
1532                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1533                                        GFP_KERNEL);
1534                 if (ses_init_buf) {
1535                         ses_init_buf->trailer.session_req.called_len = 32;
1536                         if (target_name && (target_name[0] != 0)) {
1537                                 rfc1002mangle(ses_init_buf->trailer.session_req.called_name,
1538                                         target_name, 16);
1539                         } else {
1540                                 rfc1002mangle(ses_init_buf->trailer.session_req.called_name,
1541                                         DEFAULT_CIFS_CALLED_NAME, 16);
1542                         }
1543
1544                         ses_init_buf->trailer.session_req.calling_len = 32;
1545                         /* calling name ends in null (byte 16) from old smb
1546                         convention. */
1547                         if (netbios_name && (netbios_name[0] != 0)) {
1548                                 rfc1002mangle(ses_init_buf->trailer.session_req.calling_name,
1549                                         netbios_name, 16);
1550                         } else {
1551                                 rfc1002mangle(ses_init_buf->trailer.session_req.calling_name,
1552                                         "LINUX_CIFS_CLNT", 16);
1553                         }
1554                         ses_init_buf->trailer.session_req.scope1 = 0;
1555                         ses_init_buf->trailer.session_req.scope2 = 0;
1556                         smb_buf = (struct smb_hdr *)ses_init_buf;
1557                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1558                         smb_buf->smb_buf_length = 0x81000044;
1559                         rc = smb_send(*csocket, smb_buf, 0x44,
1560                                 (struct sockaddr *)psin_server);
1561                         kfree(ses_init_buf);
1562                         msleep(1); /* RFC1001 layer in at least one server
1563                                       requires very short break before negprot
1564                                       presumably because not expecting negprot
1565                                       to follow so fast.  This is a simple
1566                                       solution that works without
1567                                       complicating the code and causes no
1568                                       significant slowing down on mount
1569                                       for everyone else */
1570                 }
1571                 /* else the negprot may still work without this
1572                 even though malloc failed */
1573
1574         }
1575
1576         return rc;
1577 }
1578
1579 static int
1580 ipv6_connect(struct sockaddr_in6 *psin_server, struct socket **csocket)
1581 {
1582         int rc = 0;
1583         int connected = 0;
1584         __be16 orig_port = 0;
1585
1586         if (*csocket == NULL) {
1587                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1588                                       IPPROTO_TCP, csocket);
1589                 if (rc < 0) {
1590                         cERROR(1, ("Error %d creating ipv6 socket", rc));
1591                         *csocket = NULL;
1592                         return rc;
1593                 } else {
1594                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1595                          cFYI(1, ("ipv6 Socket created"));
1596                         (*csocket)->sk->sk_allocation = GFP_NOFS;
1597                 }
1598         }
1599
1600         psin_server->sin6_family = AF_INET6;
1601
1602         if (psin_server->sin6_port) { /* user overrode default port */
1603                 rc = (*csocket)->ops->connect(*csocket,
1604                                 (struct sockaddr *) psin_server,
1605                                 sizeof (struct sockaddr_in6), 0);
1606                 if (rc >= 0)
1607                         connected = 1;
1608         }
1609
1610         if (!connected) {
1611                 /* save original port so we can retry user specified port
1612                         later if fall back ports fail this time  */
1613
1614                 orig_port = psin_server->sin6_port;
1615                 /* do not retry on the same port we just failed on */
1616                 if (psin_server->sin6_port != htons(CIFS_PORT)) {
1617                         psin_server->sin6_port = htons(CIFS_PORT);
1618
1619                         rc = (*csocket)->ops->connect(*csocket,
1620                                         (struct sockaddr *) psin_server,
1621                                         sizeof (struct sockaddr_in6), 0);
1622                         if (rc >= 0)
1623                                 connected = 1;
1624                 }
1625         }
1626         if (!connected) {
1627                 psin_server->sin6_port = htons(RFC1001_PORT);
1628                 rc = (*csocket)->ops->connect(*csocket, (struct sockaddr *)
1629                                  psin_server, sizeof (struct sockaddr_in6), 0);
1630                 if (rc >= 0)
1631                         connected = 1;
1632         }
1633
1634         /* give up here - unless we want to retry on different
1635                 protocol families some day */
1636         if (!connected) {
1637                 if (orig_port)
1638                         psin_server->sin6_port = orig_port;
1639                 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1640                 sock_release(*csocket);
1641                 *csocket = NULL;
1642                 return rc;
1643         }
1644         /* Eventually check for other socket options to change from
1645                 the default. sock_setsockopt not used because it expects
1646                 user space buffer */
1647         (*csocket)->sk->sk_rcvtimeo = 7 * HZ;
1648
1649         return rc;
1650 }
1651
1652 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1653                           struct super_block *sb, struct smb_vol *vol_info)
1654 {
1655         /* if we are reconnecting then should we check to see if
1656          * any requested capabilities changed locally e.g. via
1657          * remount but we can not do much about it here
1658          * if they have (even if we could detect it by the following)
1659          * Perhaps we could add a backpointer to array of sb from tcon
1660          * or if we change to make all sb to same share the same
1661          * sb as NFS - then we only have one backpointer to sb.
1662          * What if we wanted to mount the server share twice once with
1663          * and once without posixacls or posix paths? */
1664         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1665
1666         if (vol_info && vol_info->no_linux_ext) {
1667                 tcon->fsUnixInfo.Capability = 0;
1668                 tcon->unix_ext = 0; /* Unix Extensions disabled */
1669                 cFYI(1, ("Linux protocol extensions disabled"));
1670                 return;
1671         } else if (vol_info)
1672                 tcon->unix_ext = 1; /* Unix Extensions supported */
1673
1674         if (tcon->unix_ext == 0) {
1675                 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1676                 return;
1677         }
1678
1679         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1680                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1681
1682                 /* check for reconnect case in which we do not
1683                    want to change the mount behavior if we can avoid it */
1684                 if (vol_info == NULL) {
1685                         /* turn off POSIX ACL and PATHNAMES if not set
1686                            originally at mount time */
1687                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1688                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1689                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0)
1690                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1691                 }
1692
1693                 cap &= CIFS_UNIX_CAP_MASK;
1694                 if (vol_info && vol_info->no_psx_acl)
1695                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1696                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
1697                         cFYI(1, ("negotiated posix acl support"));
1698                         if (sb)
1699                                 sb->s_flags |= MS_POSIXACL;
1700                 }
1701
1702                 if (vol_info && vol_info->posix_paths == 0)
1703                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1704                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
1705                         cFYI(1, ("negotiate posix pathnames"));
1706                         if (sb)
1707                                 CIFS_SB(sb)->mnt_cifs_flags |=
1708                                         CIFS_MOUNT_POSIX_PATHS;
1709                 }
1710
1711                 /* We might be setting the path sep back to a different
1712                 form if we are reconnecting and the server switched its
1713                 posix path capability for this share */
1714                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
1715                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
1716
1717                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
1718                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
1719                                 CIFS_SB(sb)->rsize = 127 * 1024;
1720 #ifdef CONFIG_CIFS_DEBUG2
1721                                 cFYI(1, ("larger reads not supported by srv"));
1722 #endif
1723                         }
1724                 }
1725
1726
1727                 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
1728 #ifdef CONFIG_CIFS_DEBUG2
1729                 if (cap & CIFS_UNIX_FCNTL_CAP)
1730                         cFYI(1, ("FCNTL cap"));
1731                 if (cap & CIFS_UNIX_EXTATTR_CAP)
1732                         cFYI(1, ("EXTATTR cap"));
1733                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1734                         cFYI(1, ("POSIX path cap"));
1735                 if (cap & CIFS_UNIX_XATTR_CAP)
1736                         cFYI(1, ("XATTR cap"));
1737                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
1738                         cFYI(1, ("POSIX ACL cap"));
1739                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
1740                         cFYI(1, ("very large read cap"));
1741                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
1742                         cFYI(1, ("very large write cap"));
1743 #endif /* CIFS_DEBUG2 */
1744                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
1745                         if (vol_info == NULL)
1746                                 cFYI(1, ("resetting capabilities failed"));
1747                         else
1748                                 cERROR(1, ("Negotiating Unix capabilities "
1749                                            "with the server failed.  Consider "
1750                                            "mounting with the Unix Extensions\n"
1751                                            "disabled, if problems are found, "
1752                                            "by specifying the nounix mount "
1753                                            "option.");
1754
1755                 }
1756         }
1757 }
1758
1759 int
1760 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
1761            char *mount_data, const char *devname)
1762 {
1763         int rc = 0;
1764         int xid;
1765         int address_type = AF_INET;
1766         struct socket *csocket = NULL;
1767         struct sockaddr_in sin_server;
1768         struct sockaddr_in6 sin_server6;
1769         struct smb_vol volume_info;
1770         struct cifsSesInfo *pSesInfo = NULL;
1771         struct cifsSesInfo *existingCifsSes = NULL;
1772         struct cifsTconInfo *tcon = NULL;
1773         struct TCP_Server_Info *srvTcp = NULL;
1774
1775         xid = GetXid();
1776
1777 /* cFYI(1, ("Entering cifs_mount. Xid: %d with: %s", xid, mount_data)); */
1778
1779         memset(&volume_info, 0, sizeof(struct smb_vol));
1780         if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
1781                 kfree(volume_info.UNC);
1782                 kfree(volume_info.password);
1783                 kfree(volume_info.prepath);
1784                 FreeXid(xid);
1785                 return -EINVAL;
1786         }
1787
1788         if (volume_info.nullauth) {
1789                 cFYI(1, ("null user"));
1790                 volume_info.username = NULL;
1791         } else if (volume_info.username) {
1792                 /* BB fixme parse for domain name here */
1793                 cFYI(1, ("Username: %s", volume_info.username));
1794         } else {
1795                 cifserror("No username specified");
1796         /* In userspace mount helper we can get user name from alternate
1797            locations such as env variables and files on disk */
1798                 kfree(volume_info.UNC);
1799                 kfree(volume_info.password);
1800                 kfree(volume_info.prepath);
1801                 FreeXid(xid);
1802                 return -EINVAL;
1803         }
1804
1805         if (volume_info.UNCip && volume_info.UNC) {
1806                 rc = cifs_inet_pton(AF_INET, volume_info.UNCip,
1807                                     &sin_server.sin_addr.s_addr);
1808
1809                 if (rc <= 0) {
1810                         /* not ipv4 address, try ipv6 */
1811                         rc = cifs_inet_pton(AF_INET6, volume_info.UNCip,
1812                                             &sin_server6.sin6_addr.in6_u);
1813                         if (rc > 0)
1814                                 address_type = AF_INET6;
1815                 } else {
1816                         address_type = AF_INET;
1817                 }
1818
1819                 if (rc <= 0) {
1820                         /* we failed translating address */
1821                         kfree(volume_info.UNC);
1822                         kfree(volume_info.password);
1823                         kfree(volume_info.prepath);
1824                         FreeXid(xid);
1825                         return -EINVAL;
1826                 }
1827
1828                 cFYI(1, ("UNC: %s ip: %s", volume_info.UNC, volume_info.UNCip));
1829                 /* success */
1830                 rc = 0;
1831         } else if (volume_info.UNCip) {
1832                 /* BB using ip addr as server name to connect to the
1833                    DFS root below */
1834                 cERROR(1, ("Connecting to DFS root not implemented yet"));
1835                 kfree(volume_info.UNC);
1836                 kfree(volume_info.password);
1837                 kfree(volume_info.prepath);
1838                 FreeXid(xid);
1839                 return -EINVAL;
1840         } else /* which servers DFS root would we conect to */ {
1841                 cERROR(1,
1842                        ("CIFS mount error: No UNC path (e.g. -o "
1843                         "unc=//192.168.1.100/public) specified"));
1844                 kfree(volume_info.UNC);
1845                 kfree(volume_info.password);
1846                 kfree(volume_info.prepath);
1847                 FreeXid(xid);
1848                 return -EINVAL;
1849         }
1850
1851         /* this is needed for ASCII cp to Unicode converts */
1852         if (volume_info.iocharset == NULL) {
1853                 cifs_sb->local_nls = load_nls_default();
1854         /* load_nls_default can not return null */
1855         } else {
1856                 cifs_sb->local_nls = load_nls(volume_info.iocharset);
1857                 if (cifs_sb->local_nls == NULL) {
1858                         cERROR(1, ("CIFS mount error: iocharset %s not found",
1859                                  volume_info.iocharset));
1860                         kfree(volume_info.UNC);
1861                         kfree(volume_info.password);
1862                         kfree(volume_info.prepath);
1863                         FreeXid(xid);
1864                         return -ELIBACC;
1865                 }
1866         }
1867
1868         if (address_type == AF_INET)
1869                 existingCifsSes = cifs_find_tcp_session(&sin_server.sin_addr,
1870                         NULL /* no ipv6 addr */,
1871                         volume_info.username, &srvTcp);
1872         else if (address_type == AF_INET6) {
1873                 cFYI(1, ("looking for ipv6 address"));
1874                 existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
1875                         &sin_server6.sin6_addr,
1876                         volume_info.username, &srvTcp);
1877         } else {
1878                 kfree(volume_info.UNC);
1879                 kfree(volume_info.password);
1880                 kfree(volume_info.prepath);
1881                 FreeXid(xid);
1882                 return -EINVAL;
1883         }
1884
1885         if (srvTcp) {
1886                 cFYI(1, ("Existing tcp session with server found"));
1887         } else {        /* create socket */
1888                 if (volume_info.port)
1889                         sin_server.sin_port = htons(volume_info.port);
1890                 else
1891                         sin_server.sin_port = 0;
1892                 if (address_type == AF_INET6) {
1893                         cFYI(1, ("attempting ipv6 connect"));
1894                         /* BB should we allow ipv6 on port 139? */
1895                         /* other OS never observed in Wild doing 139 with v6 */
1896                         rc = ipv6_connect(&sin_server6, &csocket);
1897                 } else
1898                         rc = ipv4_connect(&sin_server, &csocket,
1899                                   volume_info.source_rfc1001_name,
1900                                   volume_info.target_rfc1001_name);
1901                 if (rc < 0) {
1902                         cERROR(1, ("Error connecting to IPv4 socket. "
1903                                    "Aborting operation"));
1904                         if (csocket != NULL)
1905                                 sock_release(csocket);
1906                         kfree(volume_info.UNC);
1907                         kfree(volume_info.password);
1908                         kfree(volume_info.prepath);
1909                         FreeXid(xid);
1910                         return rc;
1911                 }
1912
1913                 srvTcp = kmalloc(sizeof (struct TCP_Server_Info), GFP_KERNEL);
1914                 if (srvTcp == NULL) {
1915                         rc = -ENOMEM;
1916                         sock_release(csocket);
1917                         kfree(volume_info.UNC);
1918                         kfree(volume_info.password);
1919                         kfree(volume_info.prepath);
1920                         FreeXid(xid);
1921                         return rc;
1922                 } else {
1923                         memset(srvTcp, 0, sizeof (struct TCP_Server_Info));
1924                         memcpy(&srvTcp->addr.sockAddr, &sin_server,
1925                                 sizeof (struct sockaddr_in));
1926                         atomic_set(&srvTcp->inFlight, 0);
1927                         /* BB Add code for ipv6 case too */
1928                         srvTcp->ssocket = csocket;
1929                         srvTcp->protocolType = IPV4;
1930                         init_waitqueue_head(&srvTcp->response_q);
1931                         init_waitqueue_head(&srvTcp->request_q);
1932                         INIT_LIST_HEAD(&srvTcp->pending_mid_q);
1933                         /* at this point we are the only ones with the pointer
1934                         to the struct since the kernel thread not created yet
1935                         so no need to spinlock this init of tcpStatus */
1936                         srvTcp->tcpStatus = CifsNew;
1937                         init_MUTEX(&srvTcp->tcpSem);
1938                         srvTcp->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread, srvTcp, "cifsd");
1939                         if ( IS_ERR(srvTcp->tsk) ) {
1940                                 rc = PTR_ERR(srvTcp->tsk);
1941                                 cERROR(1, ("error %d create cifsd thread", rc));
1942                                 srvTcp->tsk = NULL;
1943                                 sock_release(csocket);
1944                                 kfree(volume_info.UNC);
1945                                 kfree(volume_info.password);
1946                                 kfree(volume_info.prepath);
1947                                 FreeXid(xid);
1948                                 return rc;
1949                         }
1950                         wait_for_completion(&cifsd_complete);
1951                         rc = 0;
1952                         memcpy(srvTcp->workstation_RFC1001_name,
1953                                 volume_info.source_rfc1001_name, 16);
1954                         memcpy(srvTcp->server_RFC1001_name,
1955                                 volume_info.target_rfc1001_name, 16);
1956                         srvTcp->sequence_number = 0;
1957                 }
1958         }
1959
1960         if (existingCifsSes) {
1961                 pSesInfo = existingCifsSes;
1962                 cFYI(1, ("Existing smb sess found"));
1963                 kfree(volume_info.password);
1964                 /* volume_info.UNC freed at end of function */
1965         } else if (!rc) {
1966                 cFYI(1, ("Existing smb sess not found"));
1967                 pSesInfo = sesInfoAlloc();
1968                 if (pSesInfo == NULL)
1969                         rc = -ENOMEM;
1970                 else {
1971                         pSesInfo->server = srvTcp;
1972                         sprintf(pSesInfo->serverName, "%u.%u.%u.%u",
1973                                 NIPQUAD(sin_server.sin_addr.s_addr));
1974                 }
1975
1976                 if (!rc) {
1977                         /* volume_info.password freed at unmount */
1978                         if (volume_info.password)
1979                                 pSesInfo->password = volume_info.password;
1980                         if (volume_info.username)
1981                                 strncpy(pSesInfo->userName,
1982                                         volume_info.username,
1983                                         MAX_USERNAME_SIZE);
1984                         if (volume_info.domainname) {
1985                                 int len = strlen(volume_info.domainname);
1986                                 pSesInfo->domainName =
1987                                         kmalloc(len + 1, GFP_KERNEL);
1988                                 if (pSesInfo->domainName)
1989                                         strcpy(pSesInfo->domainName,
1990                                                 volume_info.domainname);
1991                         }
1992                         pSesInfo->linux_uid = volume_info.linux_uid;
1993                         pSesInfo->overrideSecFlg = volume_info.secFlg;
1994                         down(&pSesInfo->sesSem);
1995                         /* BB FIXME need to pass vol->secFlgs BB */
1996                         rc = cifs_setup_session(xid, pSesInfo,
1997                                                 cifs_sb->local_nls);
1998                         up(&pSesInfo->sesSem);
1999                         if (!rc)
2000                                 atomic_inc(&srvTcp->socketUseCount);
2001                 } else
2002                         kfree(volume_info.password);
2003         }
2004
2005         /* search for existing tcon to this server share */
2006         if (!rc) {
2007                 if (volume_info.rsize > CIFSMaxBufSize) {
2008                         cERROR(1, ("rsize %d too large, using MaxBufSize",
2009                                 volume_info.rsize));
2010                         cifs_sb->rsize = CIFSMaxBufSize;
2011                 } else if ((volume_info.rsize) &&
2012                                 (volume_info.rsize <= CIFSMaxBufSize))
2013                         cifs_sb->rsize = volume_info.rsize;
2014                 else /* default */
2015                         cifs_sb->rsize = CIFSMaxBufSize;
2016
2017                 if (volume_info.wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2018                         cERROR(1, ("wsize %d too large, using 4096 instead",
2019                                   volume_info.wsize));
2020                         cifs_sb->wsize = 4096;
2021                 } else if (volume_info.wsize)
2022                         cifs_sb->wsize = volume_info.wsize;
2023                 else
2024                         cifs_sb->wsize =
2025                                 min_t(const int, PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2026                                         127*1024);
2027                         /* old default of CIFSMaxBufSize was too small now
2028                            that SMB Write2 can send multiple pages in kvec.
2029                            RFC1001 does not describe what happens when frame
2030                            bigger than 128K is sent so use that as max in
2031                            conjunction with 52K kvec constraint on arch with 4K
2032                            page size  */
2033
2034                 if (cifs_sb->rsize < 2048) {
2035                         cifs_sb->rsize = 2048;
2036                         /* Windows ME may prefer this */
2037                         cFYI(1, ("readsize set to minimum: 2048"));
2038                 }
2039                 /* calculate prepath */
2040                 cifs_sb->prepath = volume_info.prepath;
2041                 if (cifs_sb->prepath) {
2042                         cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2043                         cifs_sb->prepath[0] = CIFS_DIR_SEP(cifs_sb);
2044                         volume_info.prepath = NULL;
2045                 } else
2046                         cifs_sb->prepathlen = 0;
2047                 cifs_sb->mnt_uid = volume_info.linux_uid;
2048                 cifs_sb->mnt_gid = volume_info.linux_gid;
2049                 cifs_sb->mnt_file_mode = volume_info.file_mode;
2050                 cifs_sb->mnt_dir_mode = volume_info.dir_mode;
2051                 cFYI(1, ("file mode: 0x%x  dir mode: 0x%x",
2052                         cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2053
2054                 if (volume_info.noperm)
2055                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2056                 if (volume_info.setuids)
2057                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2058                 if (volume_info.server_ino)
2059                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2060                 if (volume_info.remap)
2061                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2062                 if (volume_info.no_xattr)
2063                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2064                 if (volume_info.sfu_emul)
2065                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2066                 if (volume_info.nobrl)
2067                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2068                 if (volume_info.cifs_acl)
2069                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2070                 if (volume_info.override_uid)
2071                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2072                 if (volume_info.override_gid)
2073                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2074                 if (volume_info.direct_io) {
2075                         cFYI(1, ("mounting share using direct i/o"));
2076                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2077                 }
2078
2079                 tcon =
2080                     find_unc(sin_server.sin_addr.s_addr, volume_info.UNC,
2081                              volume_info.username);
2082                 if (tcon) {
2083                         cFYI(1, ("Found match on UNC path"));
2084                         /* we can have only one retry value for a connection
2085                            to a share so for resources mounted more than once
2086                            to the same server share the last value passed in
2087                            for the retry flag is used */
2088                         tcon->retry = volume_info.retry;
2089                         tcon->nocase = volume_info.nocase;
2090                 } else {
2091                         tcon = tconInfoAlloc();
2092                         if (tcon == NULL)
2093                                 rc = -ENOMEM;
2094                         else {
2095                                 /* check for null share name ie connecting to
2096                                  * dfs root */
2097
2098                                 /* BB check if this works for exactly length
2099                                  * three strings */
2100                                 if ((strchr(volume_info.UNC + 3, '\\') == NULL)
2101                                     && (strchr(volume_info.UNC + 3, '/') ==
2102                                         NULL)) {
2103                                         rc = connect_to_dfs_path(xid, pSesInfo,
2104                                                 "", cifs_sb->local_nls,
2105                                                 cifs_sb->mnt_cifs_flags &
2106                                                   CIFS_MOUNT_MAP_SPECIAL_CHR);
2107                                         kfree(volume_info.UNC);
2108                                         FreeXid(xid);
2109                                         return -ENODEV;
2110                                 } else {
2111                                         /* BB Do we need to wrap sesSem around
2112                                          * this TCon call and Unix SetFS as
2113                                          * we do on SessSetup and reconnect? */
2114                                         rc = CIFSTCon(xid, pSesInfo,
2115                                                 volume_info.UNC,
2116                                                 tcon, cifs_sb->local_nls);
2117                                         cFYI(1, ("CIFS Tcon rc = %d", rc));
2118                                 }
2119                                 if (!rc) {
2120                                         atomic_inc(&pSesInfo->inUse);
2121                                         tcon->retry = volume_info.retry;
2122                                         tcon->nocase = volume_info.nocase;
2123                                 }
2124                         }
2125                 }
2126         }
2127         if (pSesInfo) {
2128                 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2129                         sb->s_maxbytes = (u64) 1 << 63;
2130                 } else
2131                         sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2132         }
2133
2134         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2135         sb->s_time_gran = 100;
2136
2137 /* on error free sesinfo and tcon struct if needed */
2138         if (rc) {
2139                 /* if session setup failed, use count is zero but
2140                 we still need to free cifsd thread */
2141                 if (atomic_read(&srvTcp->socketUseCount) == 0) {
2142                         spin_lock(&GlobalMid_Lock);
2143                         srvTcp->tcpStatus = CifsExiting;
2144                         spin_unlock(&GlobalMid_Lock);
2145                         if (srvTcp->tsk) {
2146                                 struct task_struct *tsk;
2147                                 /* If we could verify that kthread_stop would
2148                                    always wake up processes blocked in
2149                                    tcp in recv_mesg then we could remove the
2150                                    send_sig call */
2151                                 force_sig(SIGKILL, srvTcp->tsk);
2152                                 tsk = srvTcp->tsk;
2153                                 if (tsk)
2154                                         kthread_stop(tsk);
2155                         }
2156                 }
2157                  /* If find_unc succeeded then rc == 0 so we can not end */
2158                 if (tcon)  /* up accidently freeing someone elses tcon struct */
2159                         tconInfoFree(tcon);
2160                 if (existingCifsSes == NULL) {
2161                         if (pSesInfo) {
2162                                 if ((pSesInfo->server) &&
2163                                     (pSesInfo->status == CifsGood)) {
2164                                         int temp_rc;
2165                                         temp_rc = CIFSSMBLogoff(xid, pSesInfo);
2166                                         /* if the socketUseCount is now zero */
2167                                         if ((temp_rc == -ESHUTDOWN) &&
2168                                             (pSesInfo->server) &&
2169                                             (pSesInfo->server->tsk)) {
2170                                                 struct task_struct *tsk;
2171                                                 force_sig(SIGKILL,
2172                                                         pSesInfo->server->tsk);
2173                                                 tsk = pSesInfo->server->tsk;
2174                                                 if (tsk)
2175                                                         kthread_stop(tsk);
2176                                         }
2177                                 } else
2178                                         cFYI(1, ("No session or bad tcon"));
2179                                 sesInfoFree(pSesInfo);
2180                                 /* pSesInfo = NULL; */
2181                         }
2182                 }
2183         } else {
2184                 atomic_inc(&tcon->useCount);
2185                 cifs_sb->tcon = tcon;
2186                 tcon->ses = pSesInfo;
2187
2188                 /* do not care if following two calls succeed - informational */
2189                 CIFSSMBQFSDeviceInfo(xid, tcon);
2190                 CIFSSMBQFSAttributeInfo(xid, tcon);
2191
2192                 /* tell server which Unix caps we support */
2193                 if (tcon->ses->capabilities & CAP_UNIX)
2194                         /* reset of caps checks mount to see if unix extensions
2195                            disabled for just this mount */
2196                         reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
2197                 else
2198                         tcon->unix_ext = 0; /* server does not support them */
2199
2200                 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2201                         cifs_sb->rsize = 1024 * 127;
2202 #ifdef CONFIG_CIFS_DEBUG2
2203                         cFYI(1, ("no very large read support, rsize now 127K"));
2204 #endif
2205                 }
2206                 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2207                         cifs_sb->wsize = min(cifs_sb->wsize,
2208                                              (tcon->ses->server->maxBuf -
2209                                               MAX_CIFS_HDR_SIZE));
2210                 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2211                         cifs_sb->rsize = min(cifs_sb->rsize,
2212                                              (tcon->ses->server->maxBuf -
2213                                               MAX_CIFS_HDR_SIZE));
2214         }
2215
2216         /* volume_info.password is freed above when existing session found
2217         (in which case it is not needed anymore) but when new sesion is created
2218         the password ptr is put in the new session structure (in which case the
2219         password will be freed at unmount time) */
2220         kfree(volume_info.UNC);
2221         kfree(volume_info.prepath);
2222         FreeXid(xid);
2223         return rc;
2224 }
2225
2226 static int
2227 CIFSSessSetup(unsigned int xid, struct cifsSesInfo *ses,
2228               char session_key[CIFS_SESS_KEY_SIZE],
2229               const struct nls_table *nls_codepage)
2230 {
2231         struct smb_hdr *smb_buffer;
2232         struct smb_hdr *smb_buffer_response;
2233         SESSION_SETUP_ANDX *pSMB;
2234         SESSION_SETUP_ANDX *pSMBr;
2235         char *bcc_ptr;
2236         char *user;
2237         char *domain;
2238         int rc = 0;
2239         int remaining_words = 0;
2240         int bytes_returned = 0;
2241         int len;
2242         __u32 capabilities;
2243         __u16 count;
2244
2245         cFYI(1, ("In sesssetup"));
2246         if (ses == NULL)
2247                 return -EINVAL;
2248         user = ses->userName;
2249         domain = ses->domainName;
2250         smb_buffer = cifs_buf_get();
2251         if (smb_buffer == NULL) {
2252                 return -ENOMEM;
2253         }
2254         smb_buffer_response = smb_buffer;
2255         pSMBr = pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2256
2257         /* send SMBsessionSetup here */
2258         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2259                         NULL /* no tCon exists yet */ , 13 /* wct */ );
2260
2261         smb_buffer->Mid = GetNextMid(ses->server);
2262         pSMB->req_no_secext.AndXCommand = 0xFF;
2263         pSMB->req_no_secext.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2264         pSMB->req_no_secext.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2265
2266         if (ses->server->secMode &
2267                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2268                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2269
2270         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2271                 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
2272         if (ses->capabilities & CAP_UNICODE) {
2273                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2274                 capabilities |= CAP_UNICODE;
2275         }
2276         if (ses->capabilities & CAP_STATUS32) {
2277                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2278                 capabilities |= CAP_STATUS32;
2279         }
2280         if (ses->capabilities & CAP_DFS) {
2281                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2282                 capabilities |= CAP_DFS;
2283         }
2284         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
2285
2286         pSMB->req_no_secext.CaseInsensitivePasswordLength =
2287                 cpu_to_le16(CIFS_SESS_KEY_SIZE);
2288
2289         pSMB->req_no_secext.CaseSensitivePasswordLength =
2290             cpu_to_le16(CIFS_SESS_KEY_SIZE);
2291         bcc_ptr = pByteArea(smb_buffer);
2292         memcpy(bcc_ptr, (char *) session_key, CIFS_SESS_KEY_SIZE);
2293         bcc_ptr += CIFS_SESS_KEY_SIZE;
2294         memcpy(bcc_ptr, (char *) session_key, CIFS_SESS_KEY_SIZE);
2295         bcc_ptr += CIFS_SESS_KEY_SIZE;
2296
2297         if (ses->capabilities & CAP_UNICODE) {
2298                 if ((long) bcc_ptr % 2) { /* must be word aligned for Unicode */
2299                         *bcc_ptr = 0;
2300                         bcc_ptr++;
2301                 }
2302                 if (user == NULL)
2303                         bytes_returned = 0; /* skip null user */
2304                 else
2305                         bytes_returned =
2306                                 cifs_strtoUCS((__le16 *) bcc_ptr, user, 100,
2307                                         nls_codepage);
2308                 /* convert number of 16 bit words to bytes */
2309                 bcc_ptr += 2 * bytes_returned;
2310                 bcc_ptr += 2;   /* trailing null */
2311                 if (domain == NULL)
2312                         bytes_returned =
2313                             cifs_strtoUCS((__le16 *) bcc_ptr,
2314                                           "CIFS_LINUX_DOM", 32, nls_codepage);
2315                 else
2316                         bytes_returned =
2317                             cifs_strtoUCS((__le16 *) bcc_ptr, domain, 64,
2318                                           nls_codepage);
2319                 bcc_ptr += 2 * bytes_returned;
2320                 bcc_ptr += 2;
2321                 bytes_returned =
2322                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
2323                                   32, nls_codepage);
2324                 bcc_ptr += 2 * bytes_returned;
2325                 bytes_returned =
2326                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release,
2327                                   32, nls_codepage);
2328                 bcc_ptr += 2 * bytes_returned;
2329                 bcc_ptr += 2;
2330                 bytes_returned =
2331                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
2332                                   64, nls_codepage);
2333                 bcc_ptr += 2 * bytes_returned;
2334                 bcc_ptr += 2;
2335         } else {
2336                 if (user != NULL) {
2337                     strncpy(bcc_ptr, user, 200);
2338                     bcc_ptr += strnlen(user, 200);
2339                 }
2340                 *bcc_ptr = 0;
2341                 bcc_ptr++;
2342                 if (domain == NULL) {
2343                         strcpy(bcc_ptr, "CIFS_LINUX_DOM");
2344                         bcc_ptr += strlen("CIFS_LINUX_DOM") + 1;
2345                 } else {
2346                         strncpy(bcc_ptr, domain, 64);
2347                         bcc_ptr += strnlen(domain, 64);
2348                         *bcc_ptr = 0;
2349                         bcc_ptr++;
2350                 }
2351                 strcpy(bcc_ptr, "Linux version ");
2352                 bcc_ptr += strlen("Linux version ");
2353                 strcpy(bcc_ptr, utsname()->release);
2354                 bcc_ptr += strlen(utsname()->release) + 1;
2355                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
2356                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
2357         }
2358         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
2359         smb_buffer->smb_buf_length += count;
2360         pSMB->req_no_secext.ByteCount = cpu_to_le16(count);
2361
2362         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
2363                          &bytes_returned, 1);
2364         if (rc) {
2365 /* rc = map_smb_to_linux_error(smb_buffer_response); now done in SendReceive */
2366         } else if ((smb_buffer_response->WordCount == 3)
2367                    || (smb_buffer_response->WordCount == 4)) {
2368                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
2369                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
2370                 if (action & GUEST_LOGIN)
2371                         cFYI(1, (" Guest login")); /* BB mark SesInfo struct? */
2372                 ses->Suid = smb_buffer_response->Uid; /* UID left in wire format
2373                                                          (little endian) */
2374                 cFYI(1, ("UID = %d ", ses->Suid));
2375         /* response can have either 3 or 4 word count - Samba sends 3 */
2376                 bcc_ptr = pByteArea(smb_buffer_response);
2377                 if ((pSMBr->resp.hdr.WordCount == 3)
2378                     || ((pSMBr->resp.hdr.WordCount == 4)
2379                         && (blob_len < pSMBr->resp.ByteCount))) {
2380                         if (pSMBr->resp.hdr.WordCount == 4)
2381                                 bcc_ptr += blob_len;
2382
2383                         if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
2384                                 if ((long) (bcc_ptr) % 2) {
2385                                         remaining_words =
2386                                             (BCC(smb_buffer_response) - 1) / 2;
2387                                         /* Unicode strings must be word
2388                                            aligned */
2389                                         bcc_ptr++;
2390                                 } else {
2391                                         remaining_words =
2392                                                 BCC(smb_buffer_response) / 2;
2393                                 }
2394                                 len =
2395                                     UniStrnlen((wchar_t *) bcc_ptr,
2396                                                remaining_words - 1);
2397 /* We look for obvious messed up bcc or strings in response so we do not go off
2398    the end since (at least) WIN2K and Windows XP have a major bug in not null
2399    terminating last Unicode string in response  */
2400                                 if (ses->serverOS)
2401                                         kfree(ses->serverOS);
2402                                 ses->serverOS = kzalloc(2 * (len + 1),
2403                                                         GFP_KERNEL);
2404                                 if (ses->serverOS == NULL)
2405                                         goto sesssetup_nomem;
2406                                 cifs_strfromUCS_le(ses->serverOS,
2407                                                    (__le16 *)bcc_ptr,
2408                                                    len, nls_codepage);
2409                                 bcc_ptr += 2 * (len + 1);
2410                                 remaining_words -= len + 1;
2411                                 ses->serverOS[2 * len] = 0;
2412                                 ses->serverOS[1 + (2 * len)] = 0;
2413                                 if (remaining_words > 0) {
2414                                         len = UniStrnlen((wchar_t *)bcc_ptr,
2415                                                          remaining_words-1);
2416                                         kfree(ses->serverNOS);
2417                                         ses->serverNOS = kzalloc(2 * (len + 1),
2418                                                                  GFP_KERNEL);
2419                                         if (ses->serverNOS == NULL)
2420                                                 goto sesssetup_nomem;
2421                                         cifs_strfromUCS_le(ses->serverNOS,
2422                                                            (__le16 *)bcc_ptr,
2423                                                            len, nls_codepage);
2424                                         bcc_ptr += 2 * (len + 1);
2425                                         ses->serverNOS[2 * len] = 0;
2426                                         ses->serverNOS[1 + (2 * len)] = 0;
2427                                         if (strncmp(ses->serverNOS,
2428                                                 "NT LAN Manager 4", 16) == 0) {
2429                                                 cFYI(1, ("NT4 server"));
2430                                                 ses->flags |= CIFS_SES_NT4;
2431                                         }
2432                                         remaining_words -= len + 1;
2433                                         if (remaining_words > 0) {
2434                                                 len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
2435                                 /* last string is not always null terminated
2436                                    (for e.g. for Windows XP & 2000) */
2437                                                 if (ses->serverDomain)
2438                                                         kfree(ses->serverDomain);
2439                                                 ses->serverDomain =
2440                                                     kzalloc(2*(len+1),
2441                                                             GFP_KERNEL);
2442                                                 if (ses->serverDomain == NULL)
2443                                                         goto sesssetup_nomem;
2444                                                 cifs_strfromUCS_le(ses->serverDomain,
2445                                                         (__le16 *)bcc_ptr,
2446                                                         len, nls_codepage);
2447                                                 bcc_ptr += 2 * (len + 1);
2448                                                 ses->serverDomain[2*len] = 0;
2449                                                 ses->serverDomain[1+(2*len)] = 0;
2450                                         } else { /* else no more room so create
2451                                                   dummy domain string */
2452                                                 if (ses->serverDomain)
2453                                                         kfree(ses->serverDomain);
2454                                                 ses->serverDomain =
2455                                                         kzalloc(2, GFP_KERNEL);
2456                                         }
2457                                 } else { /* no room so create dummy domain
2458                                             and NOS string */
2459
2460                                         /* if these kcallocs fail not much we
2461                                            can do, but better to not fail the
2462                                            sesssetup itself */
2463                                         kfree(ses->serverDomain);
2464                                         ses->serverDomain =
2465                                             kzalloc(2, GFP_KERNEL);
2466                                         kfree(ses->serverNOS);
2467                                         ses->serverNOS =
2468                                             kzalloc(2, GFP_KERNEL);
2469                                 }
2470                         } else {        /* ASCII */
2471                                 len = strnlen(bcc_ptr, 1024);
2472                                 if (((long) bcc_ptr + len) - (long)
2473                                     pByteArea(smb_buffer_response)
2474                                             <= BCC(smb_buffer_response)) {
2475                                         kfree(ses->serverOS);
2476                                         ses->serverOS = kzalloc(len + 1,
2477                                                                 GFP_KERNEL);
2478                                         if (ses->serverOS == NULL)
2479                                                 goto sesssetup_nomem;
2480                                         strncpy(ses->serverOS, bcc_ptr, len);
2481
2482                                         bcc_ptr += len;
2483                                         /* null terminate the string */
2484                                         bcc_ptr[0] = 0;
2485                                         bcc_ptr++;
2486
2487                                         len = strnlen(bcc_ptr, 1024);
2488                                         kfree(ses->serverNOS);
2489                                         ses->serverNOS = kzalloc(len + 1,
2490                                                                  GFP_KERNEL);
2491                                         if (ses->serverNOS == NULL)
2492                                                 goto sesssetup_nomem;
2493                                         strncpy(ses->serverNOS, bcc_ptr, len);
2494                                         bcc_ptr += len;
2495                                         bcc_ptr[0] = 0;
2496                                         bcc_ptr++;
2497
2498                                         len = strnlen(bcc_ptr, 1024);
2499                                         if (ses->serverDomain)
2500                                                 kfree(ses->serverDomain);
2501                                         ses->serverDomain = kzalloc(len + 1,
2502                                                                     GFP_KERNEL);
2503                                         if (ses->serverDomain == NULL)
2504                                                 goto sesssetup_nomem;
2505                                         strncpy(ses->serverDomain, bcc_ptr,
2506                                                 len);
2507                                         bcc_ptr += len;
2508                                         bcc_ptr[0] = 0;
2509                                         bcc_ptr++;
2510                                 } else
2511                                         cFYI(1,
2512                                              ("Variable field of length %d "
2513                                                 "extends beyond end of smb ",
2514                                               len));
2515                         }
2516                 } else {
2517                         cERROR(1,
2518                                (" Security Blob Length extends beyond "
2519                                 "end of SMB"));
2520                 }
2521         } else {
2522                 cERROR(1,
2523                        (" Invalid Word count %d: ",
2524                         smb_buffer_response->WordCount));
2525                 rc = -EIO;
2526         }
2527 sesssetup_nomem:        /* do not return an error on nomem for the info strings,
2528                            since that could make reconnection harder, and
2529                            reconnection might be needed to free memory */
2530         if (smb_buffer)
2531                 cifs_buf_release(smb_buffer);
2532
2533         return rc;
2534 }
2535
2536 static int
2537 CIFSNTLMSSPNegotiateSessSetup(unsigned int xid,
2538                               struct cifsSesInfo *ses, int *pNTLMv2_flag,
2539                               const struct nls_table *nls_codepage)
2540 {
2541         struct smb_hdr *smb_buffer;
2542         struct smb_hdr *smb_buffer_response;
2543         SESSION_SETUP_ANDX *pSMB;
2544         SESSION_SETUP_ANDX *pSMBr;
2545         char *bcc_ptr;
2546         char *domain;
2547         int rc = 0;
2548         int remaining_words = 0;
2549         int bytes_returned = 0;
2550         int len;
2551         int SecurityBlobLength = sizeof (NEGOTIATE_MESSAGE);
2552         PNEGOTIATE_MESSAGE SecurityBlob;
2553         PCHALLENGE_MESSAGE SecurityBlob2;
2554         __u32 negotiate_flags, capabilities;
2555         __u16 count;
2556
2557         cFYI(1, ("In NTLMSSP sesssetup (negotiate)"));
2558         if (ses == NULL)
2559                 return -EINVAL;
2560         domain = ses->domainName;
2561         *pNTLMv2_flag = FALSE;
2562         smb_buffer = cifs_buf_get();
2563         if (smb_buffer == NULL) {
2564                 return -ENOMEM;
2565         }
2566         smb_buffer_response = smb_buffer;
2567         pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2568         pSMBr = (SESSION_SETUP_ANDX *) smb_buffer_response;
2569
2570         /* send SMBsessionSetup here */
2571         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2572                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2573
2574         smb_buffer->Mid = GetNextMid(ses->server);
2575         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2576         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2577
2578         pSMB->req.AndXCommand = 0xFF;
2579         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2580         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2581
2582         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2583                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2584
2585         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2586             CAP_EXTENDED_SECURITY;
2587         if (ses->capabilities & CAP_UNICODE) {
2588                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2589                 capabilities |= CAP_UNICODE;
2590         }
2591         if (ses->capabilities & CAP_STATUS32) {
2592                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2593                 capabilities |= CAP_STATUS32;
2594         }
2595         if (ses->capabilities & CAP_DFS) {
2596                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2597                 capabilities |= CAP_DFS;
2598         }
2599         pSMB->req.Capabilities = cpu_to_le32(capabilities);
2600
2601         bcc_ptr = (char *) &pSMB->req.SecurityBlob;
2602         SecurityBlob = (PNEGOTIATE_MESSAGE) bcc_ptr;
2603         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
2604         SecurityBlob->MessageType = NtLmNegotiate;
2605         negotiate_flags =
2606             NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_OEM |
2607             NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_NTLM |
2608             NTLMSSP_NEGOTIATE_56 |
2609             /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN | */ NTLMSSP_NEGOTIATE_128;
2610         if (sign_CIFS_PDUs)
2611                 negotiate_flags |= NTLMSSP_NEGOTIATE_SIGN;
2612 /*      if (ntlmv2_support)
2613                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;*/
2614         /* setup pointers to domain name and workstation name */
2615         bcc_ptr += SecurityBlobLength;
2616
2617         SecurityBlob->WorkstationName.Buffer = 0;
2618         SecurityBlob->WorkstationName.Length = 0;
2619         SecurityBlob->WorkstationName.MaximumLength = 0;
2620
2621         /* Domain not sent on first Sesssetup in NTLMSSP, instead it is sent
2622         along with username on auth request (ie the response to challenge) */
2623         SecurityBlob->DomainName.Buffer = 0;
2624         SecurityBlob->DomainName.Length = 0;
2625         SecurityBlob->DomainName.MaximumLength = 0;
2626         if (ses->capabilities & CAP_UNICODE) {
2627                 if ((long) bcc_ptr % 2) {
2628                         *bcc_ptr = 0;
2629                         bcc_ptr++;
2630                 }
2631
2632                 bytes_returned =
2633                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
2634                                   32, nls_codepage);
2635                 bcc_ptr += 2 * bytes_returned;
2636                 bytes_returned =
2637                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
2638                                   nls_codepage);
2639                 bcc_ptr += 2 * bytes_returned;
2640                 bcc_ptr += 2;   /* null terminate Linux version */
2641                 bytes_returned =
2642                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
2643                                   64, nls_codepage);
2644                 bcc_ptr += 2 * bytes_returned;
2645                 *(bcc_ptr + 1) = 0;
2646                 *(bcc_ptr + 2) = 0;
2647                 bcc_ptr += 2;   /* null terminate network opsys string */
2648                 *(bcc_ptr + 1) = 0;
2649                 *(bcc_ptr + 2) = 0;
2650                 bcc_ptr += 2;   /* null domain */
2651         } else {                /* ASCII */
2652                 strcpy(bcc_ptr, "Linux version ");
2653                 bcc_ptr += strlen("Linux version ");
2654                 strcpy(bcc_ptr, utsname()->release);
2655                 bcc_ptr += strlen(utsname()->release) + 1;
2656                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
2657                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
2658                 bcc_ptr++;      /* empty domain field */
2659                 *bcc_ptr = 0;
2660         }
2661         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
2662         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
2663         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
2664         smb_buffer->smb_buf_length += count;
2665         pSMB->req.ByteCount = cpu_to_le16(count);
2666
2667         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
2668                          &bytes_returned, 1);
2669
2670         if (smb_buffer_response->Status.CifsError ==
2671             cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
2672                 rc = 0;
2673
2674         if (rc) {
2675 /*    rc = map_smb_to_linux_error(smb_buffer_response);  *//* done in SendReceive now */
2676         } else if ((smb_buffer_response->WordCount == 3)
2677                    || (smb_buffer_response->WordCount == 4)) {
2678                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
2679                 __u16 blob_len = le16_to_cpu(pSMBr->resp.SecurityBlobLength);
2680
2681                 if (action & GUEST_LOGIN)
2682                         cFYI(1, (" Guest login"));
2683         /* Do we want to set anything in SesInfo struct when guest login? */
2684
2685                 bcc_ptr = pByteArea(smb_buffer_response);
2686         /* response can have either 3 or 4 word count - Samba sends 3 */
2687
2688                 SecurityBlob2 = (PCHALLENGE_MESSAGE) bcc_ptr;
2689                 if (SecurityBlob2->MessageType != NtLmChallenge) {
2690                         cFYI(1,
2691                              ("Unexpected NTLMSSP message type received %d",
2692                               SecurityBlob2->MessageType));
2693                 } else if (ses) {
2694                         ses->Suid = smb_buffer_response->Uid; /* UID left in le format */
2695                         cFYI(1, ("UID = %d", ses->Suid));
2696                         if ((pSMBr->resp.hdr.WordCount == 3)
2697                             || ((pSMBr->resp.hdr.WordCount == 4)
2698                                 && (blob_len <
2699                                     pSMBr->resp.ByteCount))) {
2700
2701                                 if (pSMBr->resp.hdr.WordCount == 4) {
2702                                         bcc_ptr += blob_len;
2703                                         cFYI(1, ("Security Blob Length %d",
2704                                               blob_len));
2705                                 }
2706
2707                                 cFYI(1, ("NTLMSSP Challenge rcvd"));
2708
2709                                 memcpy(ses->server->cryptKey,
2710                                        SecurityBlob2->Challenge,
2711                                        CIFS_CRYPTO_KEY_SIZE);
2712                                 if (SecurityBlob2->NegotiateFlags &
2713                                         cpu_to_le32(NTLMSSP_NEGOTIATE_NTLMV2))
2714                                         *pNTLMv2_flag = TRUE;
2715
2716                                 if ((SecurityBlob2->NegotiateFlags &
2717                                         cpu_to_le32(NTLMSSP_NEGOTIATE_ALWAYS_SIGN))
2718                                         || (sign_CIFS_PDUs > 1))
2719                                                 ses->server->secMode |=
2720                                                         SECMODE_SIGN_REQUIRED;
2721                                 if ((SecurityBlob2->NegotiateFlags &
2722                                         cpu_to_le32(NTLMSSP_NEGOTIATE_SIGN)) && (sign_CIFS_PDUs))
2723                                                 ses->server->secMode |=
2724                                                         SECMODE_SIGN_ENABLED;
2725
2726                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
2727                                         if ((long) (bcc_ptr) % 2) {
2728                                                 remaining_words =
2729                                                     (BCC(smb_buffer_response)
2730                                                      - 1) / 2;
2731                                          /* Must word align unicode strings */
2732                                                 bcc_ptr++;
2733                                         } else {
2734                                                 remaining_words =
2735                                                     BCC
2736                                                     (smb_buffer_response) / 2;
2737                                         }
2738                                         len =
2739                                             UniStrnlen((wchar_t *) bcc_ptr,
2740                                                        remaining_words - 1);
2741 /* We look for obvious messed up bcc or strings in response so we do not go off
2742    the end since (at least) WIN2K and Windows XP have a major bug in not null
2743    terminating last Unicode string in response  */
2744                                         if (ses->serverOS)
2745                                                 kfree(ses->serverOS);
2746                                         ses->serverOS =
2747                                             kzalloc(2 * (len + 1), GFP_KERNEL);
2748                                         cifs_strfromUCS_le(ses->serverOS,
2749                                                            (__le16 *)
2750                                                            bcc_ptr, len,
2751                                                            nls_codepage);
2752                                         bcc_ptr += 2 * (len + 1);
2753                                         remaining_words -= len + 1;
2754                                         ses->serverOS[2 * len] = 0;
2755                                         ses->serverOS[1 + (2 * len)] = 0;
2756                                         if (remaining_words > 0) {
2757                                                 len = UniStrnlen((wchar_t *)
2758                                                                  bcc_ptr,
2759                                                                  remaining_words
2760                                                                  - 1);
2761                                                 kfree(ses->serverNOS);
2762                                                 ses->serverNOS =
2763                                                     kzalloc(2 * (len + 1),
2764                                                             GFP_KERNEL);
2765                                                 cifs_strfromUCS_le(ses->
2766                                                                    serverNOS,
2767                                                                    (__le16 *)
2768                                                                    bcc_ptr,
2769                                                                    len,
2770                                                                    nls_codepage);
2771                                                 bcc_ptr += 2 * (len + 1);
2772                                                 ses->serverNOS[2 * len] = 0;
2773                                                 ses->serverNOS[1 +
2774                                                                (2 * len)] = 0;
2775                                                 remaining_words -= len + 1;
2776                                                 if (remaining_words > 0) {
2777                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
2778                                 /* last string not always null terminated
2779                                    (for e.g. for Windows XP & 2000) */
2780                                                         kfree(ses->serverDomain);
2781                                                         ses->serverDomain =
2782                                                             kzalloc(2 *
2783                                                                     (len +
2784                                                                      1),
2785                                                                     GFP_KERNEL);
2786                                                         cifs_strfromUCS_le
2787                                                             (ses->serverDomain,
2788                                                              (__le16 *)bcc_ptr,
2789                                                              len, nls_codepage);
2790                                                         bcc_ptr +=
2791                                                             2 * (len + 1);
2792                                                         ses->serverDomain[2*len]
2793                                                             = 0;
2794                                                         ses->serverDomain
2795                                                                 [1 + (2 * len)]
2796                                                             = 0;
2797                                                 } /* else no more room so create dummy domain string */
2798                                                 else {
2799                                                         kfree(ses->serverDomain);
2800                                                         ses->serverDomain =
2801                                                             kzalloc(2,
2802                                                                     GFP_KERNEL);
2803                                                 }
2804                                         } else {        /* no room so create dummy domain and NOS string */
2805                                                 kfree(ses->serverDomain);
2806                                                 ses->serverDomain =
2807                                                     kzalloc(2, GFP_KERNEL);
2808                                                 kfree(ses->serverNOS);
2809                                                 ses->serverNOS =
2810                                                     kzalloc(2, GFP_KERNEL);
2811                                         }
2812                                 } else {        /* ASCII */
2813                                         len = strnlen(bcc_ptr, 1024);
2814                                         if (((long) bcc_ptr + len) - (long)
2815                                             pByteArea(smb_buffer_response)
2816                                             <= BCC(smb_buffer_response)) {
2817                                                 if (ses->serverOS)
2818                                                         kfree(ses->serverOS);
2819                                                 ses->serverOS =
2820                                                     kzalloc(len + 1,
2821                                                             GFP_KERNEL);
2822                                                 strncpy(ses->serverOS,
2823                                                         bcc_ptr, len);
2824
2825                                                 bcc_ptr += len;
2826                                                 bcc_ptr[0] = 0; /* null terminate string */
2827                                                 bcc_ptr++;
2828
2829                                                 len = strnlen(bcc_ptr, 1024);
2830                                                 kfree(ses->serverNOS);
2831                                                 ses->serverNOS =
2832                                                     kzalloc(len + 1,
2833                                                             GFP_KERNEL);
2834                                                 strncpy(ses->serverNOS, bcc_ptr, len);
2835                                                 bcc_ptr += len;
2836                                                 bcc_ptr[0] = 0;
2837                                                 bcc_ptr++;
2838
2839                                                 len = strnlen(bcc_ptr, 1024);
2840                                                 kfree(ses->serverDomain);
2841                                                 ses->serverDomain =
2842                                                     kzalloc(len + 1,
2843                                                             GFP_KERNEL);
2844                                                 strncpy(ses->serverDomain,
2845                                                         bcc_ptr, len);
2846                                                 bcc_ptr += len;
2847                                                 bcc_ptr[0] = 0;
2848                                                 bcc_ptr++;
2849                                         } else
2850                                                 cFYI(1,
2851                                                      ("field of length %d "
2852                                                     "extends beyond end of smb",
2853                                                       len));
2854                                 }
2855                         } else {
2856                                 cERROR(1, ("Security Blob Length extends beyond"
2857                                            " end of SMB"));
2858                         }
2859                 } else {
2860                         cERROR(1, ("No session structure passed in."));
2861                 }
2862         } else {
2863                 cERROR(1,
2864                        (" Invalid Word count %d:",
2865                         smb_buffer_response->WordCount));
2866                 rc = -EIO;
2867         }
2868
2869         if (smb_buffer)
2870                 cifs_buf_release(smb_buffer);
2871
2872         return rc;
2873 }
2874 static int
2875 CIFSNTLMSSPAuthSessSetup(unsigned int xid, struct cifsSesInfo *ses,
2876                 char *ntlm_session_key, int ntlmv2_flag,
2877                 const struct nls_table *nls_codepage)
2878 {
2879         struct smb_hdr *smb_buffer;
2880         struct smb_hdr *smb_buffer_response;
2881         SESSION_SETUP_ANDX *pSMB;
2882         SESSION_SETUP_ANDX *pSMBr;
2883         char *bcc_ptr;
2884         char *user;
2885         char *domain;
2886         int rc = 0;
2887         int remaining_words = 0;
2888         int bytes_returned = 0;
2889         int len;
2890         int SecurityBlobLength = sizeof (AUTHENTICATE_MESSAGE);
2891         PAUTHENTICATE_MESSAGE SecurityBlob;
2892         __u32 negotiate_flags, capabilities;
2893         __u16 count;
2894
2895         cFYI(1, ("In NTLMSSPSessSetup (Authenticate)"));
2896         if (ses == NULL)
2897                 return -EINVAL;
2898         user = ses->userName;
2899         domain = ses->domainName;
2900         smb_buffer = cifs_buf_get();
2901         if (smb_buffer == NULL) {
2902                 return -ENOMEM;
2903         }
2904         smb_buffer_response = smb_buffer;
2905         pSMB = (SESSION_SETUP_ANDX *) smb_buffer;
2906         pSMBr = (SESSION_SETUP_ANDX *) smb_buffer_response;
2907
2908         /* send SMBsessionSetup here */
2909         header_assemble(smb_buffer, SMB_COM_SESSION_SETUP_ANDX,
2910                         NULL /* no tCon exists yet */ , 12 /* wct */ );
2911
2912         smb_buffer->Mid = GetNextMid(ses->server);
2913         pSMB->req.hdr.Flags |= (SMBFLG_CASELESS | SMBFLG_CANONICAL_PATH_FORMAT);
2914         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
2915         pSMB->req.AndXCommand = 0xFF;
2916         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
2917         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
2918
2919         pSMB->req.hdr.Uid = ses->Suid;
2920
2921         if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2922                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2923
2924         capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
2925             CAP_EXTENDED_SECURITY;
2926         if (ses->capabilities & CAP_UNICODE) {
2927                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2928                 capabilities |= CAP_UNICODE;
2929         }
2930         if (ses->capabilities & CAP_STATUS32) {
2931                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2932                 capabilities |= CAP_STATUS32;
2933         }
2934         if (ses->capabilities & CAP_DFS) {
2935                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2936                 capabilities |= CAP_DFS;
2937         }
2938         pSMB->req.Capabilities = cpu_to_le32(capabilities);
2939
2940         bcc_ptr = (char *) &pSMB->req.SecurityBlob;
2941         SecurityBlob = (PAUTHENTICATE_MESSAGE) bcc_ptr;
2942         strncpy(SecurityBlob->Signature, NTLMSSP_SIGNATURE, 8);
2943         SecurityBlob->MessageType = NtLmAuthenticate;
2944         bcc_ptr += SecurityBlobLength;
2945         negotiate_flags =
2946             NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_REQUEST_TARGET |
2947             NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_TARGET_INFO |
2948             0x80000000 | NTLMSSP_NEGOTIATE_128;
2949         if (sign_CIFS_PDUs)
2950                 negotiate_flags |= /* NTLMSSP_NEGOTIATE_ALWAYS_SIGN |*/ NTLMSSP_NEGOTIATE_SIGN;
2951         if (ntlmv2_flag)
2952                 negotiate_flags |= NTLMSSP_NEGOTIATE_NTLMV2;
2953
2954 /* setup pointers to domain name and workstation name */
2955
2956         SecurityBlob->WorkstationName.Buffer = 0;
2957         SecurityBlob->WorkstationName.Length = 0;
2958         SecurityBlob->WorkstationName.MaximumLength = 0;
2959         SecurityBlob->SessionKey.Length = 0;
2960         SecurityBlob->SessionKey.MaximumLength = 0;
2961         SecurityBlob->SessionKey.Buffer = 0;
2962
2963         SecurityBlob->LmChallengeResponse.Length = 0;
2964         SecurityBlob->LmChallengeResponse.MaximumLength = 0;
2965         SecurityBlob->LmChallengeResponse.Buffer = 0;
2966
2967         SecurityBlob->NtChallengeResponse.Length =
2968             cpu_to_le16(CIFS_SESS_KEY_SIZE);
2969         SecurityBlob->NtChallengeResponse.MaximumLength =
2970             cpu_to_le16(CIFS_SESS_KEY_SIZE);
2971         memcpy(bcc_ptr, ntlm_session_key, CIFS_SESS_KEY_SIZE);
2972         SecurityBlob->NtChallengeResponse.Buffer =
2973             cpu_to_le32(SecurityBlobLength);
2974         SecurityBlobLength += CIFS_SESS_KEY_SIZE;
2975         bcc_ptr += CIFS_SESS_KEY_SIZE;
2976
2977         if (ses->capabilities & CAP_UNICODE) {
2978                 if (domain == NULL) {
2979                         SecurityBlob->DomainName.Buffer = 0;
2980                         SecurityBlob->DomainName.Length = 0;
2981                         SecurityBlob->DomainName.MaximumLength = 0;
2982                 } else {
2983                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, domain, 64,
2984                                           nls_codepage);
2985                         ln *= 2;
2986                         SecurityBlob->DomainName.MaximumLength =
2987                             cpu_to_le16(ln);
2988                         SecurityBlob->DomainName.Buffer =
2989                             cpu_to_le32(SecurityBlobLength);
2990                         bcc_ptr += ln;
2991                         SecurityBlobLength += ln;
2992                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
2993                 }
2994                 if (user == NULL) {
2995                         SecurityBlob->UserName.Buffer = 0;
2996                         SecurityBlob->UserName.Length = 0;
2997                         SecurityBlob->UserName.MaximumLength = 0;
2998                 } else {
2999                         __u16 ln = cifs_strtoUCS((__le16 *) bcc_ptr, user, 64,
3000                                           nls_codepage);
3001                         ln *= 2;
3002                         SecurityBlob->UserName.MaximumLength =
3003                             cpu_to_le16(ln);
3004                         SecurityBlob->UserName.Buffer =
3005                             cpu_to_le32(SecurityBlobLength);
3006                         bcc_ptr += ln;
3007                         SecurityBlobLength += ln;
3008                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3009                 }
3010
3011                 /* SecurityBlob->WorkstationName.Length =
3012                  cifs_strtoUCS((__le16 *) bcc_ptr, "AMACHINE",64, nls_codepage);
3013                    SecurityBlob->WorkstationName.Length *= 2;
3014                    SecurityBlob->WorkstationName.MaximumLength =
3015                         cpu_to_le16(SecurityBlob->WorkstationName.Length);
3016                    SecurityBlob->WorkstationName.Buffer =
3017                                  cpu_to_le32(SecurityBlobLength);
3018                    bcc_ptr += SecurityBlob->WorkstationName.Length;
3019                    SecurityBlobLength += SecurityBlob->WorkstationName.Length;
3020                    SecurityBlob->WorkstationName.Length =
3021                         cpu_to_le16(SecurityBlob->WorkstationName.Length);  */
3022
3023                 if ((long) bcc_ptr % 2) {
3024                         *bcc_ptr = 0;
3025                         bcc_ptr++;
3026                 }
3027                 bytes_returned =
3028                     cifs_strtoUCS((__le16 *) bcc_ptr, "Linux version ",
3029                                   32, nls_codepage);
3030                 bcc_ptr += 2 * bytes_returned;
3031                 bytes_returned =
3032                     cifs_strtoUCS((__le16 *) bcc_ptr, utsname()->release, 32,
3033                                   nls_codepage);
3034                 bcc_ptr += 2 * bytes_returned;
3035                 bcc_ptr += 2;   /* null term version string */
3036                 bytes_returned =
3037                     cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
3038                                   64, nls_codepage);
3039                 bcc_ptr += 2 * bytes_returned;
3040                 *(bcc_ptr + 1) = 0;
3041                 *(bcc_ptr + 2) = 0;
3042                 bcc_ptr += 2;   /* null terminate network opsys string */
3043                 *(bcc_ptr + 1) = 0;
3044                 *(bcc_ptr + 2) = 0;
3045                 bcc_ptr += 2;   /* null domain */
3046         } else {                /* ASCII */
3047                 if (domain == NULL) {
3048                         SecurityBlob->DomainName.Buffer = 0;
3049                         SecurityBlob->DomainName.Length = 0;
3050                         SecurityBlob->DomainName.MaximumLength = 0;
3051                 } else {
3052                         __u16 ln;
3053                         negotiate_flags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
3054                         strncpy(bcc_ptr, domain, 63);
3055                         ln = strnlen(domain, 64);
3056                         SecurityBlob->DomainName.MaximumLength =
3057                             cpu_to_le16(ln);
3058                         SecurityBlob->DomainName.Buffer =
3059                             cpu_to_le32(SecurityBlobLength);
3060                         bcc_ptr += ln;
3061                         SecurityBlobLength += ln;
3062                         SecurityBlob->DomainName.Length = cpu_to_le16(ln);
3063                 }
3064                 if (user == NULL) {
3065                         SecurityBlob->UserName.Buffer = 0;
3066                         SecurityBlob->UserName.Length = 0;
3067                         SecurityBlob->UserName.MaximumLength = 0;
3068                 } else {
3069                         __u16 ln;
3070                         strncpy(bcc_ptr, user, 63);
3071                         ln = strnlen(user, 64);
3072                         SecurityBlob->UserName.MaximumLength = cpu_to_le16(ln);
3073                         SecurityBlob->UserName.Buffer =
3074                                                 cpu_to_le32(SecurityBlobLength);
3075                         bcc_ptr += ln;
3076                         SecurityBlobLength += ln;
3077                         SecurityBlob->UserName.Length = cpu_to_le16(ln);
3078                 }
3079                 /* BB fill in our workstation name if known BB */
3080
3081                 strcpy(bcc_ptr, "Linux version ");
3082                 bcc_ptr += strlen("Linux version ");
3083                 strcpy(bcc_ptr, utsname()->release);
3084                 bcc_ptr += strlen(utsname()->release) + 1;
3085                 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
3086                 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
3087                 bcc_ptr++;      /* null domain */
3088                 *bcc_ptr = 0;
3089         }
3090         SecurityBlob->NegotiateFlags = cpu_to_le32(negotiate_flags);
3091         pSMB->req.SecurityBlobLength = cpu_to_le16(SecurityBlobLength);
3092         count = (long) bcc_ptr - (long) pByteArea(smb_buffer);
3093         smb_buffer->smb_buf_length += count;
3094         pSMB->req.ByteCount = cpu_to_le16(count);
3095
3096         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
3097                          &bytes_returned, 1);
3098         if (rc) {
3099 /*    rc = map_smb_to_linux_error(smb_buffer_response);  *//* done in SendReceive now */
3100         } else if ((smb_buffer_response->WordCount == 3)
3101                    || (smb_buffer_response->WordCount == 4)) {
3102                 __u16 action = le16_to_cpu(pSMBr->resp.Action);
3103                 __u16 blob_len =
3104                     le16_to_cpu(pSMBr->resp.SecurityBlobLength);
3105                 if (action & GUEST_LOGIN)
3106                         cFYI(1, (" Guest login")); /* BB Should we set anything
3107                                                          in SesInfo struct ? */
3108 /*              if (SecurityBlob2->MessageType != NtLm??) {
3109                         cFYI("Unexpected message type on auth response is %d"));
3110                 } */
3111
3112                 if (ses) {
3113                         cFYI(1,
3114                              ("Check challenge UID %d vs auth response UID %d",
3115                               ses->Suid, smb_buffer_response->Uid));
3116                         /* UID left in wire format */
3117                         ses->Suid = smb_buffer_response->Uid;
3118                         bcc_ptr = pByteArea(smb_buffer_response);
3119                 /* response can have either 3 or 4 word count - Samba sends 3 */
3120                         if ((pSMBr->resp.hdr.WordCount == 3)
3121                             || ((pSMBr->resp.hdr.WordCount == 4)
3122                                 && (blob_len <
3123                                     pSMBr->resp.ByteCount))) {
3124                                 if (pSMBr->resp.hdr.WordCount == 4) {
3125                                         bcc_ptr +=
3126                                             blob_len;
3127                                         cFYI(1,
3128                                              ("Security Blob Length %d ",
3129                                               blob_len));
3130                                 }
3131
3132                                 cFYI(1,
3133                                      ("NTLMSSP response to Authenticate "));
3134
3135                                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
3136                                         if ((long) (bcc_ptr) % 2) {
3137                                                 remaining_words =
3138                                                     (BCC(smb_buffer_response)
3139                                                      - 1) / 2;
3140                                                 bcc_ptr++;      /* Unicode strings must be word aligned */
3141                                         } else {
3142                                                 remaining_words = BCC(smb_buffer_response) / 2;
3143                                         }
3144                                         len = UniStrnlen((wchar_t *) bcc_ptr,
3145                                                         remaining_words - 1);
3146 /* We look for obvious messed up bcc or strings in response so we do not go off
3147   the end since (at least) WIN2K and Windows XP have a major bug in not null
3148   terminating last Unicode string in response  */
3149                                         if (ses->serverOS)
3150                                                 kfree(ses->serverOS);
3151                                         ses->serverOS =
3152                                             kzalloc(2 * (len + 1), GFP_KERNEL);
3153                                         cifs_strfromUCS_le(ses->serverOS,
3154                                                            (__le16 *)
3155                                                            bcc_ptr, len,
3156                                                            nls_codepage);
3157                                         bcc_ptr += 2 * (len + 1);
3158                                         remaining_words -= len + 1;
3159                                         ses->serverOS[2 * len] = 0;
3160                                         ses->serverOS[1 + (2 * len)] = 0;
3161                                         if (remaining_words > 0) {
3162                                                 len = UniStrnlen((wchar_t *)
3163                                                                  bcc_ptr,
3164                                                                  remaining_words
3165                                                                  - 1);
3166                                                 kfree(ses->serverNOS);
3167                                                 ses->serverNOS =
3168                                                     kzalloc(2 * (len + 1),
3169                                                             GFP_KERNEL);
3170                                                 cifs_strfromUCS_le(ses->
3171                                                                    serverNOS,
3172                                                                    (__le16 *)
3173                                                                    bcc_ptr,
3174                                                                    len,
3175                                                                    nls_codepage);
3176                                                 bcc_ptr += 2 * (len + 1);
3177                                                 ses->serverNOS[2 * len] = 0;
3178                                                 ses->serverNOS[1+(2*len)] = 0;
3179                                                 remaining_words -= len + 1;
3180                                                 if (remaining_words > 0) {
3181                                                         len = UniStrnlen((wchar_t *) bcc_ptr, remaining_words);
3182      /* last string not always null terminated (e.g. for Windows XP & 2000) */
3183                                                         if (ses->serverDomain)
3184                                                                 kfree(ses->serverDomain);
3185                                                         ses->serverDomain =
3186                                                             kzalloc(2 *
3187                                                                     (len +
3188                                                                      1),
3189                                                                     GFP_KERNEL);
3190                                                         cifs_strfromUCS_le
3191                                                             (ses->
3192                                                              serverDomain,
3193                                                              (__le16 *)
3194                                                              bcc_ptr, len,
3195                                                              nls_codepage);
3196                                                         bcc_ptr +=
3197                                                             2 * (len + 1);
3198                                                         ses->
3199                                                             serverDomain[2
3200                                                                          * len]
3201                                                             = 0;
3202                                                         ses->
3203                                                             serverDomain[1
3204                                                                          +
3205                                                                          (2
3206                                                                           *
3207                                                                           len)]
3208                                                             = 0;
3209                                                 } /* else no more room so create dummy domain string */
3210                                                 else {
3211                                                         if (ses->serverDomain)
3212                                                                 kfree(ses->serverDomain);
3213                                                         ses->serverDomain = kzalloc(2,GFP_KERNEL);
3214                                                 }
3215                                         } else {  /* no room so create dummy domain and NOS string */
3216                                                 if (ses->serverDomain)
3217                                                         kfree(ses->serverDomain);
3218                                                 ses->serverDomain = kzalloc(2, GFP_KERNEL);
3219                                                 kfree(ses->serverNOS);
3220                                                 ses->serverNOS = kzalloc(2, GFP_KERNEL);
3221                                         }
3222                                 } else {        /* ASCII */
3223                                         len = strnlen(bcc_ptr, 1024);
3224                                         if (((long) bcc_ptr + len) -
3225                                            (long) pByteArea(smb_buffer_response)
3226                                                 <= BCC(smb_buffer_response)) {
3227                                                 if (ses->serverOS)
3228                                                         kfree(ses->serverOS);
3229                                                 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
3230                                                 strncpy(ses->serverOS,bcc_ptr, len);
3231
3232                                                 bcc_ptr += len;
3233                                                 bcc_ptr[0] = 0; /* null terminate the string */
3234                                                 bcc_ptr++;
3235
3236                                                 len = strnlen(bcc_ptr, 1024);
3237                                                 kfree(ses->serverNOS);
3238                                                 ses->serverNOS = kzalloc(len+1,
3239                                                                     GFP_KERNEL);
3240                                                 strncpy(ses->serverNOS,
3241                                                         bcc_ptr, len);
3242                                                 bcc_ptr += len;
3243                                                 bcc_ptr[0] = 0;
3244                                                 bcc_ptr++;
3245
3246                                                 len = strnlen(bcc_ptr, 1024);
3247                                                 if (ses->serverDomain)
3248                                                         kfree(ses->serverDomain);
3249                                                 ses->serverDomain =
3250                                                                 kzalloc(len+1,
3251                                                                     GFP_KERNEL);
3252                                                 strncpy(ses->serverDomain,
3253                                                         bcc_ptr, len);
3254                                                 bcc_ptr += len;
3255                                                 bcc_ptr[0] = 0;
3256                                                 bcc_ptr++;
3257                                         } else
3258                                                 cFYI(1,
3259                                                      ("field of length %d "
3260                                                    "extends beyond end of smb ",
3261                                                       len));
3262                                 }
3263                         } else {
3264                                 cERROR(1,
3265                                        (" Security Blob extends beyond end "
3266                                         "of SMB"));
3267                         }
3268                 } else {
3269                         cERROR(1, ("No session structure passed in."));
3270                 }
3271         } else {
3272                 cERROR(1,
3273                        (" Invalid Word count %d: ",
3274                         smb_buffer_response->WordCount));
3275                 rc = -EIO;
3276         }
3277
3278         if (smb_buffer)
3279                 cifs_buf_release(smb_buffer);
3280
3281         return rc;
3282 }
3283
3284 int
3285 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
3286          const char *tree, struct cifsTconInfo *tcon,
3287          const struct nls_table *nls_codepage)
3288 {
3289         struct smb_hdr *smb_buffer;
3290         struct smb_hdr *smb_buffer_response;
3291         TCONX_REQ *pSMB;
3292         TCONX_RSP *pSMBr;
3293         unsigned char *bcc_ptr;
3294         int rc = 0;
3295         int length;
3296         __u16 count;
3297
3298         if (ses == NULL)
3299                 return -EIO;
3300
3301         smb_buffer = cifs_buf_get();
3302         if (smb_buffer == NULL) {
3303                 return -ENOMEM;
3304         }
3305         smb_buffer_response = smb_buffer;
3306
3307         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3308                         NULL /*no tid */ , 4 /*wct */ );
3309
3310         smb_buffer->Mid = GetNextMid(ses->server);
3311         smb_buffer->Uid = ses->Suid;
3312         pSMB = (TCONX_REQ *) smb_buffer;
3313         pSMBr = (TCONX_RSP *) smb_buffer_response;
3314
3315         pSMB->AndXCommand = 0xFF;
3316         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3317         bcc_ptr = &pSMB->Password[0];
3318         if ((ses->server->secMode) & SECMODE_USER) {
3319                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
3320                 *bcc_ptr = 0; /* password is null byte */
3321                 bcc_ptr++;              /* skip password */
3322                 /* already aligned so no need to do it below */
3323         } else {
3324                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
3325                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3326                    specified as required (when that support is added to
3327                    the vfs in the future) as only NTLM or the much
3328                    weaker LANMAN (which we do not send by default) is accepted
3329                    by Samba (not sure whether other servers allow
3330                    NTLMv2 password here) */
3331 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3332                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
3333                         (ses->server->secType == LANMAN))
3334                         calc_lanman_hash(ses, bcc_ptr);
3335                 else
3336 #endif /* CIFS_WEAK_PW_HASH */
3337                 SMBNTencrypt(ses->password,
3338                              ses->server->cryptKey,
3339                              bcc_ptr);
3340
3341                 bcc_ptr += CIFS_SESS_KEY_SIZE;
3342                 if (ses->capabilities & CAP_UNICODE) {
3343                         /* must align unicode strings */
3344                         *bcc_ptr = 0; /* null byte password */
3345                         bcc_ptr++;
3346                 }
3347         }
3348
3349         if (ses->server->secMode &
3350                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3351                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3352
3353         if (ses->capabilities & CAP_STATUS32) {
3354                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3355         }
3356         if (ses->capabilities & CAP_DFS) {
3357                 smb_buffer->Flags2 |= SMBFLG2_DFS;
3358         }
3359         if (ses->capabilities & CAP_UNICODE) {
3360                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3361                 length =
3362                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3363                         6 /* max utf8 char length in bytes */ *
3364                         (/* server len*/ + 256 /* share len */), nls_codepage);
3365                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
3366                 bcc_ptr += 2;   /* skip trailing null */
3367         } else {                /* ASCII */
3368                 strcpy(bcc_ptr, tree);
3369                 bcc_ptr += strlen(tree) + 1;
3370         }
3371         strcpy(bcc_ptr, "?????");
3372         bcc_ptr += strlen("?????");
3373         bcc_ptr += 1;
3374         count = bcc_ptr - &pSMB->Password[0];
3375         pSMB->hdr.smb_buf_length += count;
3376         pSMB->ByteCount = cpu_to_le16(count);
3377
3378         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, 0);
3379
3380         /* if (rc) rc = map_smb_to_linux_error(smb_buffer_response); */
3381         /* above now done in SendReceive */
3382         if ((rc == 0) && (tcon != NULL)) {
3383                 tcon->tidStatus = CifsGood;
3384                 tcon->tid = smb_buffer_response->Tid;
3385                 bcc_ptr = pByteArea(smb_buffer_response);
3386                 length = strnlen(bcc_ptr, BCC(smb_buffer_response) - 2);
3387                 /* skip service field (NB: this field is always ASCII) */
3388                 bcc_ptr += length + 1;
3389                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3390                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) {
3391                         length = UniStrnlen((wchar_t *) bcc_ptr, 512);
3392                         if ((bcc_ptr + (2 * length)) -
3393                              pByteArea(smb_buffer_response) <=
3394                             BCC(smb_buffer_response)) {
3395                                 kfree(tcon->nativeFileSystem);
3396                                 tcon->nativeFileSystem =
3397                                     kzalloc(length + 2, GFP_KERNEL);
3398                                 if (tcon->nativeFileSystem)
3399                                         cifs_strfromUCS_le(
3400                                                 tcon->nativeFileSystem,
3401                                                 (__le16 *) bcc_ptr,
3402                                                 length, nls_codepage);
3403                                 bcc_ptr += 2 * length;
3404                                 bcc_ptr[0] = 0; /* null terminate the string */
3405                                 bcc_ptr[1] = 0;
3406                                 bcc_ptr += 2;
3407                         }
3408                         /* else do not bother copying these information fields*/
3409                 } else {
3410                         length = strnlen(bcc_ptr, 1024);
3411                         if ((bcc_ptr + length) -
3412                             pByteArea(smb_buffer_response) <=
3413                             BCC(smb_buffer_response)) {
3414                                 kfree(tcon->nativeFileSystem);
3415                                 tcon->nativeFileSystem =
3416                                     kzalloc(length + 1, GFP_KERNEL);
3417                                 if (tcon->nativeFileSystem)
3418                                         strncpy(tcon->nativeFileSystem, bcc_ptr,
3419                                                 length);
3420                         }
3421                         /* else do not bother copying these information fields*/
3422                 }
3423                 if ((smb_buffer_response->WordCount == 3) ||
3424                          (smb_buffer_response->WordCount == 7))
3425                         /* field is in same location */
3426                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3427                 else
3428                         tcon->Flags = 0;
3429                 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
3430         } else if ((rc == 0) && tcon == NULL) {
3431                 /* all we need to save for IPC$ connection */
3432                 ses->ipc_tid = smb_buffer_response->Tid;
3433         }
3434
3435         if (smb_buffer)
3436                 cifs_buf_release(smb_buffer);
3437         return rc;
3438 }
3439
3440 int
3441 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
3442 {
3443         int rc = 0;
3444         int xid;
3445         struct cifsSesInfo *ses = NULL;
3446         struct task_struct *cifsd_task;
3447         char *tmp;
3448
3449         xid = GetXid();
3450
3451         if (cifs_sb->tcon) {
3452                 ses = cifs_sb->tcon->ses; /* save ptr to ses before delete tcon!*/
3453                 rc = CIFSSMBTDis(xid, cifs_sb->tcon);
3454                 if (rc == -EBUSY) {
3455                         FreeXid(xid);
3456                         return 0;
3457                 }
3458                 tconInfoFree(cifs_sb->tcon);
3459                 if ((ses) && (ses->server)) {
3460                         /* save off task so we do not refer to ses later */
3461                         cifsd_task = ses->server->tsk;
3462                         cFYI(1, ("About to do SMBLogoff "));
3463                         rc = CIFSSMBLogoff(xid, ses);
3464                         if (rc == -EBUSY) {
3465                                 FreeXid(xid);
3466                                 return 0;
3467                         } else if (rc == -ESHUTDOWN) {
3468                                 cFYI(1, ("Waking up socket by sending signal"));
3469                                 if (cifsd_task) {
3470                                         force_sig(SIGKILL, cifsd_task);
3471                                         kthread_stop(cifsd_task);
3472                                 }
3473                                 rc = 0;
3474                         } /* else - we have an smb session
3475                                 left on this socket do not kill cifsd */
3476                 } else
3477                         cFYI(1, ("No session or bad tcon"));
3478         }
3479
3480         cifs_sb->tcon = NULL;
3481         tmp = cifs_sb->prepath;
3482         cifs_sb->prepathlen = 0;
3483         cifs_sb->prepath = NULL;
3484         kfree(tmp);
3485         if (ses)
3486                 schedule_timeout_interruptible(msecs_to_jiffies(500));
3487         if (ses)
3488                 sesInfoFree(ses);
3489
3490         FreeXid(xid);
3491         return rc;      /* BB check if we should always return zero here */
3492 }
3493
3494 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
3495                                            struct nls_table *nls_info)
3496 {
3497         int rc = 0;
3498         char ntlm_session_key[CIFS_SESS_KEY_SIZE];
3499         int ntlmv2_flag = FALSE;
3500         int first_time = 0;
3501
3502         /* what if server changes its buffer size after dropping the session? */
3503         if (pSesInfo->server->maxBuf == 0) /* no need to send on reconnect */ {
3504                 rc = CIFSSMBNegotiate(xid, pSesInfo);
3505                 if (rc == -EAGAIN) /* retry only once on 1st time connection */ {
3506                         rc = CIFSSMBNegotiate(xid, pSesInfo);
3507                         if (rc == -EAGAIN)
3508                                 rc = -EHOSTDOWN;
3509                 }
3510                 if (rc == 0) {
3511                         spin_lock(&GlobalMid_Lock);
3512                         if (pSesInfo->server->tcpStatus != CifsExiting)
3513                                 pSesInfo->server->tcpStatus = CifsGood;
3514                         else
3515                                 rc = -EHOSTDOWN;
3516                         spin_unlock(&GlobalMid_Lock);
3517
3518                 }
3519                 first_time = 1;
3520         }
3521         if (!rc) {
3522                 pSesInfo->flags = 0;
3523                 pSesInfo->capabilities = pSesInfo->server->capabilities;
3524                 if (linuxExtEnabled == 0)
3525                         pSesInfo->capabilities &= (~CAP_UNIX);
3526         /*      pSesInfo->sequence_number = 0;*/
3527                 cFYI(1,
3528                       ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3529                         pSesInfo->server->secMode,
3530                         pSesInfo->server->capabilities,
3531                         pSesInfo->server->timeAdj));
3532                 if (experimEnabled < 2)
3533                         rc = CIFS_SessSetup(xid, pSesInfo,
3534                                             first_time, nls_info);
3535                 else if (extended_security
3536                                 && (pSesInfo->capabilities
3537                                         & CAP_EXTENDED_SECURITY)
3538                                 && (pSesInfo->server->secType == NTLMSSP)) {
3539                         rc = -EOPNOTSUPP;
3540                 } else if (extended_security
3541                            && (pSesInfo->capabilities & CAP_EXTENDED_SECURITY)
3542                            && (pSesInfo->server->secType == RawNTLMSSP)) {
3543                         cFYI(1, ("NTLMSSP sesssetup"));
3544                         rc = CIFSNTLMSSPNegotiateSessSetup(xid,
3545                                                 pSesInfo,
3546                                                 &ntlmv2_flag,
3547                                                 nls_info);
3548                         if (!rc) {
3549                                 if (ntlmv2_flag) {
3550                                         char *v2_response;
3551                                         cFYI(1, ("more secure NTLM ver2 hash"));
3552                                         if (CalcNTLMv2_partial_mac_key(pSesInfo,
3553                                                 nls_info)) {
3554                                                 rc = -ENOMEM;
3555                                                 goto ss_err_exit;
3556                                         } else
3557                                                 v2_response = kmalloc(16 + 64 /* blob */, GFP_KERNEL);
3558                                         if (v2_response) {
3559                                                 CalcNTLMv2_response(pSesInfo,
3560                                                                    v2_response);
3561                                 /*              if (first_time)
3562                                                   cifs_calculate_ntlmv2_mac_key(
3563                                                    pSesInfo->server->mac_signing_key,
3564                                                    response, ntlm_session_key,*/
3565                                                 kfree(v2_response);
3566                                         /* BB Put dummy sig in SessSetup PDU? */
3567                                         } else {
3568                                                 rc = -ENOMEM;
3569                                                 goto ss_err_exit;
3570                                         }
3571
3572                                 } else {
3573                                         SMBNTencrypt(pSesInfo->password,
3574                                                 pSesInfo->server->cryptKey,
3575                                                 ntlm_session_key);
3576
3577                                         if (first_time)
3578                                                 cifs_calculate_mac_key(
3579                                                         &pSesInfo->server->mac_signing_key,
3580                                                         ntlm_session_key,
3581                                                         pSesInfo->password);
3582                                 }
3583                         /* for better security the weaker lanman hash not sent
3584                            in AuthSessSetup so we no longer calculate it */
3585
3586                                 rc = CIFSNTLMSSPAuthSessSetup(xid,
3587                                         pSesInfo,
3588                                         ntlm_session_key,
3589                                         ntlmv2_flag,
3590                                         nls_info);
3591                         }
3592                 } else { /* old style NTLM 0.12 session setup */
3593                         SMBNTencrypt(pSesInfo->password,
3594                                 pSesInfo->server->cryptKey,
3595                                 ntlm_session_key);
3596
3597                         if (first_time)
3598                                 cifs_calculate_mac_key(
3599                                         &pSesInfo->server->mac_signing_key,
3600                                         ntlm_session_key, pSesInfo->password);
3601
3602                         rc = CIFSSessSetup(xid, pSesInfo,
3603                                 ntlm_session_key, nls_info);
3604                 }
3605                 if (rc) {
3606                         cERROR(1, ("Send error in SessSetup = %d", rc));
3607                 } else {
3608                         cFYI(1, ("CIFS Session Established successfully"));
3609                         pSesInfo->status = CifsGood;
3610                 }
3611         }
3612 ss_err_exit:
3613         return rc;
3614 }
3615