kernel/fs/cifs/cifs_debug.c

   1 /*
   2  *   fs/cifs_debug.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2000,2005
   5  *
   6  *   Modified by Steve French (sfrench@us.ibm.com)
   7  *
   8  *   This program is free software;  you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16  *   the GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program;  if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22 #include <linux/fs.h>
  23 #include <linux/string.h>
  24 #include <linux/ctype.h>
  25 #include <linux/module.h>
  26 #include <linux/proc_fs.h>
  27 #include <asm/uaccess.h>
  28 #include "cifspdu.h"
  29 #include "cifsglob.h"
  30 #include "cifsproto.h"
  31 #include "cifs_debug.h"
  32 #include "cifsfs.h"
  33
  34 void
  35 cifs_dump_mem(char *label, void *data, int length)
  36 {
  37         pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
  38         print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
  39                        data, length, true);
  40 }
  41
  42 #ifdef CONFIG_CIFS_DEBUG
  43 void cifs_vfs_err(const char *fmt, ...)
  44 {
  45         struct va_format vaf;
  46         va_list args;
  47
  48         va_start(args, fmt);
  49
  50         vaf.fmt = fmt;
  51         vaf.va = &args;
  52
  53         pr_err_ratelimited("CIFS VFS: %pV", &vaf);
  54
  55         va_end(args);
  56 }
  57 #endif
  58
  59 void cifs_dump_detail(void *buf)
  60 {
  61 #ifdef CONFIG_CIFS_DEBUG2
  62         struct smb_hdr *smb = (struct smb_hdr *)buf;
  63
  64         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
  65                  smb->Command, smb->Status.CifsError,
  66                  smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  67         cifs_dbg(VFS, "smb buf %p len %u\n", smb, smbCalcSize(smb));
  68 #endif /* CONFIG_CIFS_DEBUG2 */
  69 }
  70
  71 void cifs_dump_mids(struct TCP_Server_Info *server)
  72 {
  73 #ifdef CONFIG_CIFS_DEBUG2
  74         struct list_head *tmp;
  75         struct mid_q_entry *mid_entry;
  76
  77         if (server == NULL)
  78                 return;
  79
  80         cifs_dbg(VFS, "Dump pending requests:\n");
  81         spin_lock(&GlobalMid_Lock);
  82         list_for_each(tmp, &server->pending_mid_q) {
  83                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  84                 cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
  85                          mid_entry->mid_state,
  86                          le16_to_cpu(mid_entry->command),
  87                          mid_entry->pid,
  88                          mid_entry->callback_data,
  89                          mid_entry->mid);
  90 #ifdef CONFIG_CIFS_STATS2
  91                 cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
  92                          mid_entry->large_buf,
  93                          mid_entry->resp_buf,
  94                          mid_entry->when_received,
  95                          jiffies);
  96 #endif /* STATS2 */
  97                 cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
  98                          mid_entry->multiRsp, mid_entry->multiEnd);
  99                 if (mid_entry->resp_buf) {
 100                         cifs_dump_detail(mid_entry->resp_buf);
 101                         cifs_dump_mem("existing buf: ",
 102                                 mid_entry->resp_buf, 62);
 103                 }
 104         }
 105         spin_unlock(&GlobalMid_Lock);
 106 #endif /* CONFIG_CIFS_DEBUG2 */
 107 }
 108
 109 #ifdef CONFIG_PROC_FS
 110 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 111 {
 112         struct list_head *tmp1, *tmp2, *tmp3;
 113         struct mid_q_entry *mid_entry;
 114         struct TCP_Server_Info *server;
 115         struct cifs_ses *ses;
 116         struct cifs_tcon *tcon;
 117         int i, j;
 118         __u32 dev_type;
 119
 120         seq_puts(m,
 121                     "Display Internal CIFS Data Structures for Debugging\n"
 122                     "---------------------------------------------------\n");
 123         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 124         seq_printf(m, "Features:");
 125 #ifdef CONFIG_CIFS_DFS_UPCALL
 126         seq_printf(m, " dfs");
 127 #endif
 128 #ifdef CONFIG_CIFS_FSCACHE
 129         seq_printf(m, " fscache");
 130 #endif
 131 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 132         seq_printf(m, " lanman");
 133 #endif
 134 #ifdef CONFIG_CIFS_POSIX
 135         seq_printf(m, " posix");
 136 #endif
 137 #ifdef CONFIG_CIFS_UPCALL
 138         seq_printf(m, " spnego");
 139 #endif
 140 #ifdef CONFIG_CIFS_XATTR
 141         seq_printf(m, " xattr");
 142 #endif
 143 #ifdef CONFIG_CIFS_ACL
 144         seq_printf(m, " acl");
 145 #endif
 146         seq_putc(m, '\n');
 147         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 148         seq_printf(m, "Servers:");
 149
 150         i = 0;
 151         spin_lock(&cifs_tcp_ses_lock);
 152         list_for_each(tmp1, &cifs_tcp_ses_list) {
 153                 server = list_entry(tmp1, struct TCP_Server_Info,
 154                                     tcp_ses_list);
 155                 seq_printf(m, "\nNumber of credits: %d", server->credits);
 156                 i++;
 157                 list_for_each(tmp2, &server->smb_ses_list) {
 158                         ses = list_entry(tmp2, struct cifs_ses,
 159                                          smb_ses_list);
 160                         if ((ses->serverDomain == NULL) ||
 161                                 (ses->serverOS == NULL) ||
 162                                 (ses->serverNOS == NULL)) {
 163                                 seq_printf(m, "\n%d) entry for %s not fully "
 164                                            "displayed\n\t", i, ses->serverName);
 165                         } else {
 166                                 seq_printf(m,
 167                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 168                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 169                                     " session status: %d\t",
 170                                 i, ses->serverName, ses->serverDomain,
 171                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 172                                 ses->capabilities, ses->status);
 173                         }
 174                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 175                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 176                                    server->tcpStatus, server->srv_count,
 177                                    server->sec_mode, in_flight(server));
 178
 179 #ifdef CONFIG_CIFS_STATS2
 180                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 181                                 atomic_read(&server->in_send),
 182                                 atomic_read(&server->num_waiters));
 183 #endif
 184
 185                         seq_puts(m, "\n\tShares:");
 186                         j = 0;
 187                         list_for_each(tmp3, &ses->tcon_list) {
 188                                 tcon = list_entry(tmp3, struct cifs_tcon,
 189                                                   tcon_list);
 190                                 ++j;
 191                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 192                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 193                                            tcon->treeName, tcon->tc_count);
 194                                 if (tcon->nativeFileSystem) {
 195                                         seq_printf(m, "Type: %s ",
 196                                                    tcon->nativeFileSystem);
 197                                 }
 198                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 199                                         "\n\tPathComponentMax: %d Status: %d",
 200                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 201                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 202                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 203                                         tcon->tidStatus);
 204                                 if (dev_type == FILE_DEVICE_DISK)
 205                                         seq_puts(m, " type: DISK ");
 206                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 207                                         seq_puts(m, " type: CDROM ");
 208                                 else
 209                                         seq_printf(m, " type: %d ", dev_type);
 210                                 if (server->ops->dump_share_caps)
 211                                         server->ops->dump_share_caps(m, tcon);
 212
 213                                 if (tcon->need_reconnect)
 214                                         seq_puts(m, "\tDISCONNECTED ");
 215                                 seq_putc(m, '\n');
 216                         }
 217
 218                         seq_puts(m, "\n\tMIDs:\n");
 219
 220                         spin_lock(&GlobalMid_Lock);
 221                         list_for_each(tmp3, &server->pending_mid_q) {
 222                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 223                                         qhead);
 224                                 seq_printf(m, "\tState: %d com: %d pid:"
 225                                               " %d cbdata: %p mid %llu\n",
 226                                               mid_entry->mid_state,
 227                                               le16_to_cpu(mid_entry->command),
 228                                               mid_entry->pid,
 229                                               mid_entry->callback_data,
 230                                               mid_entry->mid);
 231                         }
 232                         spin_unlock(&GlobalMid_Lock);
 233                 }
 234         }
 235         spin_unlock(&cifs_tcp_ses_lock);
 236         seq_putc(m, '\n');
 237
 238         /* BB add code to dump additional info such as TCP session info now */
 239         return 0;
 240 }
 241
 242 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 243 {
 244         return single_open(file, cifs_debug_data_proc_show, NULL);
 245 }
 246
 247 static const struct file_operations cifs_debug_data_proc_fops = {
 248         .owner          = THIS_MODULE,
 249         .open           = cifs_debug_data_proc_open,
 250         .read           = seq_read,
 251         .llseek         = seq_lseek,
 252         .release        = single_release,
 253 };
 254
 255 #ifdef CONFIG_CIFS_STATS
 256 static ssize_t cifs_stats_proc_write(struct file *file,
 257                 const char __user *buffer, size_t count, loff_t *ppos)
 258 {
 259         bool bv;
 260         int rc;
 261         struct list_head *tmp1, *tmp2, *tmp3;
 262         struct TCP_Server_Info *server;
 263         struct cifs_ses *ses;
 264         struct cifs_tcon *tcon;
 265
 266         rc = kstrtobool_from_user(buffer, count, &bv);
 267         if (rc == 0) {
 268 #ifdef CONFIG_CIFS_STATS2
 269                 atomic_set(&totBufAllocCount, 0);
 270                 atomic_set(&totSmBufAllocCount, 0);
 271 #endif /* CONFIG_CIFS_STATS2 */
 272                 spin_lock(&cifs_tcp_ses_lock);
 273                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 274                         server = list_entry(tmp1, struct TCP_Server_Info,
 275                                             tcp_ses_list);
 276                         list_for_each(tmp2, &server->smb_ses_list) {
 277                                 ses = list_entry(tmp2, struct cifs_ses,
 278                                                  smb_ses_list);
 279                                 list_for_each(tmp3, &ses->tcon_list) {
 280                                         tcon = list_entry(tmp3,
 281                                                           struct cifs_tcon,
 282                                                           tcon_list);
 283                                         atomic_set(&tcon->num_smbs_sent, 0);
 284                                         if (server->ops->clear_stats)
 285                                                 server->ops->clear_stats(tcon);
 286                                 }
 287                         }
 288                 }
 289                 spin_unlock(&cifs_tcp_ses_lock);
 290         } else {
 291                 return rc;
 292         }
 293
 294         return count;
 295 }
 296
 297 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 298 {
 299         int i;
 300         struct list_head *tmp1, *tmp2, *tmp3;
 301         struct TCP_Server_Info *server;
 302         struct cifs_ses *ses;
 303         struct cifs_tcon *tcon;
 304
 305         seq_printf(m,
 306                         "Resources in use\nCIFS Session: %d\n",
 307                         sesInfoAllocCount.counter);
 308         seq_printf(m, "Share (unique mount targets): %d\n",
 309                         tconInfoAllocCount.counter);
 310         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 311                         bufAllocCount.counter,
 312                         cifs_min_rcv + tcpSesAllocCount.counter);
 313         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 314                         smBufAllocCount.counter, cifs_min_small);
 315 #ifdef CONFIG_CIFS_STATS2
 316         seq_printf(m, "Total Large %d Small %d Allocations\n",
 317                                 atomic_read(&totBufAllocCount),
 318                                 atomic_read(&totSmBufAllocCount));
 319 #endif /* CONFIG_CIFS_STATS2 */
 320
 321         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 322         seq_printf(m,
 323                 "\n%d session %d share reconnects\n",
 324                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 325
 326         seq_printf(m,
 327                 "Total vfs operations: %d maximum at one time: %d\n",
 328                 GlobalCurrentXid, GlobalMaxActiveXid);
 329
 330         i = 0;
 331         spin_lock(&cifs_tcp_ses_lock);
 332         list_for_each(tmp1, &cifs_tcp_ses_list) {
 333                 server = list_entry(tmp1, struct TCP_Server_Info,
 334                                     tcp_ses_list);
 335                 list_for_each(tmp2, &server->smb_ses_list) {
 336                         ses = list_entry(tmp2, struct cifs_ses,
 337                                          smb_ses_list);
 338                         list_for_each(tmp3, &ses->tcon_list) {
 339                                 tcon = list_entry(tmp3,
 340                                                   struct cifs_tcon,
 341                                                   tcon_list);
 342                                 i++;
 343                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 344                                 if (tcon->need_reconnect)
 345                                         seq_puts(m, "\tDISCONNECTED ");
 346                                 seq_printf(m, "\nSMBs: %d",
 347                                            atomic_read(&tcon->num_smbs_sent));
 348                                 if (server->ops->print_stats)
 349                                         server->ops->print_stats(m, tcon);
 350                         }
 351                 }
 352         }
 353         spin_unlock(&cifs_tcp_ses_lock);
 354
 355         seq_putc(m, '\n');
 356         return 0;
 357 }
 358
 359 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 360 {
 361         return single_open(file, cifs_stats_proc_show, NULL);
 362 }
 363
 364 static const struct file_operations cifs_stats_proc_fops = {
 365         .owner          = THIS_MODULE,
 366         .open           = cifs_stats_proc_open,
 367         .read           = seq_read,
 368         .llseek         = seq_lseek,
 369         .release        = single_release,
 370         .write          = cifs_stats_proc_write,
 371 };
 372 #endif /* STATS */
 373
 374 static struct proc_dir_entry *proc_fs_cifs;
 375 static const struct file_operations cifsFYI_proc_fops;
 376 static const struct file_operations cifs_lookup_cache_proc_fops;
 377 static const struct file_operations traceSMB_proc_fops;
 378 static const struct file_operations cifs_security_flags_proc_fops;
 379 static const struct file_operations cifs_linux_ext_proc_fops;
 380
 381 void
 382 cifs_proc_init(void)
 383 {
 384         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 385         if (proc_fs_cifs == NULL)
 386                 return;
 387
 388         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 389
 390 #ifdef CONFIG_CIFS_STATS
 391         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 392 #endif /* STATS */
 393         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 394         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 395         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 396                     &cifs_linux_ext_proc_fops);
 397         proc_create("SecurityFlags", 0, proc_fs_cifs,
 398                     &cifs_security_flags_proc_fops);
 399         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 400                     &cifs_lookup_cache_proc_fops);
 401 }
 402
 403 void
 404 cifs_proc_clean(void)
 405 {
 406         if (proc_fs_cifs == NULL)
 407                 return;
 408
 409         remove_proc_entry("DebugData", proc_fs_cifs);
 410         remove_proc_entry("cifsFYI", proc_fs_cifs);
 411         remove_proc_entry("traceSMB", proc_fs_cifs);
 412 #ifdef CONFIG_CIFS_STATS
 413         remove_proc_entry("Stats", proc_fs_cifs);
 414 #endif
 415         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 416         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 417         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 418         remove_proc_entry("fs/cifs", NULL);
 419 }
 420
 421 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 422 {
 423         seq_printf(m, "%d\n", cifsFYI);
 424         return 0;
 425 }
 426
 427 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 428 {
 429         return single_open(file, cifsFYI_proc_show, NULL);
 430 }
 431
 432 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 433                 size_t count, loff_t *ppos)
 434 {
 435         char c[2] = { '\0' };
 436         bool bv;
 437         int rc;
 438
 439         rc = get_user(c[0], buffer);
 440         if (rc)
 441                 return rc;
 442         if (strtobool(c, &bv) == 0)
 443                 cifsFYI = bv;
 444         else if ((c[0] > '1') && (c[0] <= '9'))
 445                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 446
 447         return count;
 448 }
 449
 450 static const struct file_operations cifsFYI_proc_fops = {
 451         .owner          = THIS_MODULE,
 452         .open           = cifsFYI_proc_open,
 453         .read           = seq_read,
 454         .llseek         = seq_lseek,
 455         .release        = single_release,
 456         .write          = cifsFYI_proc_write,
 457 };
 458
 459 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 460 {
 461         seq_printf(m, "%d\n", linuxExtEnabled);
 462         return 0;
 463 }
 464
 465 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 466 {
 467         return single_open(file, cifs_linux_ext_proc_show, NULL);
 468 }
 469
 470 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 471                 const char __user *buffer, size_t count, loff_t *ppos)
 472 {
 473         int rc;
 474
 475         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 476         if (rc)
 477                 return rc;
 478
 479         return count;
 480 }
 481
 482 static const struct file_operations cifs_linux_ext_proc_fops = {
 483         .owner          = THIS_MODULE,
 484         .open           = cifs_linux_ext_proc_open,
 485         .read           = seq_read,
 486         .llseek         = seq_lseek,
 487         .release        = single_release,
 488         .write          = cifs_linux_ext_proc_write,
 489 };
 490
 491 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 492 {
 493         seq_printf(m, "%d\n", lookupCacheEnabled);
 494         return 0;
 495 }
 496
 497 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 498 {
 499         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 500 }
 501
 502 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 503                 const char __user *buffer, size_t count, loff_t *ppos)
 504 {
 505         int rc;
 506
 507         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
 508         if (rc)
 509                 return rc;
 510
 511         return count;
 512 }
 513
 514 static const struct file_operations cifs_lookup_cache_proc_fops = {
 515         .owner          = THIS_MODULE,
 516         .open           = cifs_lookup_cache_proc_open,
 517         .read           = seq_read,
 518         .llseek         = seq_lseek,
 519         .release        = single_release,
 520         .write          = cifs_lookup_cache_proc_write,
 521 };
 522
 523 static int traceSMB_proc_show(struct seq_file *m, void *v)
 524 {
 525         seq_printf(m, "%d\n", traceSMB);
 526         return 0;
 527 }
 528
 529 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 530 {
 531         return single_open(file, traceSMB_proc_show, NULL);
 532 }
 533
 534 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 535                 size_t count, loff_t *ppos)
 536 {
 537         int rc;
 538
 539         rc = kstrtobool_from_user(buffer, count, &traceSMB);
 540         if (rc)
 541                 return rc;
 542
 543         return count;
 544 }
 545
 546 static const struct file_operations traceSMB_proc_fops = {
 547         .owner          = THIS_MODULE,
 548         .open           = traceSMB_proc_open,
 549         .read           = seq_read,
 550         .llseek         = seq_lseek,
 551         .release        = single_release,
 552         .write          = traceSMB_proc_write,
 553 };
 554
 555 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 556 {
 557         seq_printf(m, "0x%x\n", global_secflags);
 558         return 0;
 559 }
 560
 561 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 562 {
 563         return single_open(file, cifs_security_flags_proc_show, NULL);
 564 }
 565
 566 /*
 567  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 568  * flags except for the ones corresponding to the given MUST flag. If there are
 569  * multiple MUST flags, then try to prefer more secure ones.
 570  */
 571 static void
 572 cifs_security_flags_handle_must_flags(unsigned int *flags)
 573 {
 574         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 575
 576         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 577                 *flags = CIFSSEC_MUST_KRB5;
 578         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 579                 *flags = CIFSSEC_MUST_NTLMSSP;
 580         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 581                 *flags = CIFSSEC_MUST_NTLMV2;
 582         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 583                 *flags = CIFSSEC_MUST_NTLM;
 584         else if (CIFSSEC_MUST_LANMAN &&
 585                  (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 586                 *flags = CIFSSEC_MUST_LANMAN;
 587         else if (CIFSSEC_MUST_PLNTXT &&
 588                  (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 589                 *flags = CIFSSEC_MUST_PLNTXT;
 590
 591         *flags |= signflags;
 592 }
 593
 594 static ssize_t cifs_security_flags_proc_write(struct file *file,
 595                 const char __user *buffer, size_t count, loff_t *ppos)
 596 {
 597         int rc;
 598         unsigned int flags;
 599         char flags_string[12];
 600         bool bv;
 601
 602         if ((count < 1) || (count > 11))
 603                 return -EINVAL;
 604
 605         memset(flags_string, 0, 12);
 606
 607         if (copy_from_user(flags_string, buffer, count))
 608                 return -EFAULT;
 609
 610         if (count < 3) {
 611                 /* single char or single char followed by null */
 612                 if (strtobool(flags_string, &bv) == 0) {
 613                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 614                         return count;
 615                 } else if (!isdigit(flags_string[0])) {
 616                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 617                                         flags_string);
 618                         return -EINVAL;
 619                 }
 620         }
 621
 622         /* else we have a number */
 623         rc = kstrtouint(flags_string, 0, &flags);
 624         if (rc) {
 625                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 626                                 flags_string);
 627                 return rc;
 628         }
 629
 630         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 631
 632         if (flags == 0)  {
 633                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 634                 return -EINVAL;
 635         }
 636
 637         if (flags & ~CIFSSEC_MASK) {
 638                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 639                          flags & ~CIFSSEC_MASK);
 640                 return -EINVAL;
 641         }
 642
 643         cifs_security_flags_handle_must_flags(&flags);
 644
 645         /* flags look ok - update the global security flags for cifs module */
 646         global_secflags = flags;
 647         if (global_secflags & CIFSSEC_MUST_SIGN) {
 648                 /* requiring signing implies signing is allowed */
 649                 global_secflags |= CIFSSEC_MAY_SIGN;
 650                 cifs_dbg(FYI, "packet signing now required\n");
 651         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 652                 cifs_dbg(FYI, "packet signing disabled\n");
 653         }
 654         /* BB should we turn on MAY flags for other MUST options? */
 655         return count;
 656 }
 657
 658 static const struct file_operations cifs_security_flags_proc_fops = {
 659         .owner          = THIS_MODULE,
 660         .open           = cifs_security_flags_proc_open,
 661         .read           = seq_read,
 662         .llseek         = seq_lseek,
 663         .release        = single_release,
 664         .write          = cifs_security_flags_proc_write,
 665 };
 666 #else
 667 inline void cifs_proc_init(void)
 668 {
 669 }
 670
 671 inline void cifs_proc_clean(void)
 672 {
 673 }
 674 #endif /* PROC_FS */