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("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                 i++;
 156                 list_for_each(tmp2, &server->smb_ses_list) {
 157                         ses = list_entry(tmp2, struct cifs_ses,
 158                                          smb_ses_list);
 159                         if ((ses->serverDomain == NULL) ||
 160                                 (ses->serverOS == NULL) ||
 161                                 (ses->serverNOS == NULL)) {
 162                                 seq_printf(m, "\n%d) entry for %s not fully "
 163                                            "displayed\n\t", i, ses->serverName);
 164                         } else {
 165                                 seq_printf(m,
 166                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 167                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 168                                     " session status: %d\t",
 169                                 i, ses->serverName, ses->serverDomain,
 170                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 171                                 ses->capabilities, ses->status);
 172                         }
 173                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 174                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 175                                    server->tcpStatus, server->srv_count,
 176                                    server->sec_mode, in_flight(server));
 177
 178 #ifdef CONFIG_CIFS_STATS2
 179                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 180                                 atomic_read(&server->in_send),
 181                                 atomic_read(&server->num_waiters));
 182 #endif
 183
 184                         seq_puts(m, "\n\tShares:");
 185                         j = 0;
 186                         list_for_each(tmp3, &ses->tcon_list) {
 187                                 tcon = list_entry(tmp3, struct cifs_tcon,
 188                                                   tcon_list);
 189                                 ++j;
 190                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 191                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 192                                            tcon->treeName, tcon->tc_count);
 193                                 if (tcon->nativeFileSystem) {
 194                                         seq_printf(m, "Type: %s ",
 195                                                    tcon->nativeFileSystem);
 196                                 }
 197                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 198                                         "\n\tPathComponentMax: %d Status: %d",
 199                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 200                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 201                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 202                                         tcon->tidStatus);
 203                                 if (dev_type == FILE_DEVICE_DISK)
 204                                         seq_puts(m, " type: DISK ");
 205                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 206                                         seq_puts(m, " type: CDROM ");
 207                                 else
 208                                         seq_printf(m, " type: %d ", dev_type);
 209                                 if (server->ops->dump_share_caps)
 210                                         server->ops->dump_share_caps(m, tcon);
 211
 212                                 if (tcon->need_reconnect)
 213                                         seq_puts(m, "\tDISCONNECTED ");
 214                                 seq_putc(m, '\n');
 215                         }
 216
 217                         seq_puts(m, "\n\tMIDs:\n");
 218
 219                         spin_lock(&GlobalMid_Lock);
 220                         list_for_each(tmp3, &server->pending_mid_q) {
 221                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 222                                         qhead);
 223                                 seq_printf(m, "\tState: %d com: %d pid:"
 224                                               " %d cbdata: %p mid %llu\n",
 225                                               mid_entry->mid_state,
 226                                               le16_to_cpu(mid_entry->command),
 227                                               mid_entry->pid,
 228                                               mid_entry->callback_data,
 229                                               mid_entry->mid);
 230                         }
 231                         spin_unlock(&GlobalMid_Lock);
 232                 }
 233         }
 234         spin_unlock(&cifs_tcp_ses_lock);
 235         seq_putc(m, '\n');
 236
 237         /* BB add code to dump additional info such as TCP session info now */
 238         return 0;
 239 }
 240
 241 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 242 {
 243         return single_open(file, cifs_debug_data_proc_show, NULL);
 244 }
 245
 246 static const struct file_operations cifs_debug_data_proc_fops = {
 247         .owner          = THIS_MODULE,
 248         .open           = cifs_debug_data_proc_open,
 249         .read           = seq_read,
 250         .llseek         = seq_lseek,
 251         .release        = single_release,
 252 };
 253
 254 #ifdef CONFIG_CIFS_STATS
 255 static ssize_t cifs_stats_proc_write(struct file *file,
 256                 const char __user *buffer, size_t count, loff_t *ppos)
 257 {
 258         char c;
 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 = get_user(c, buffer);
 267         if (rc)
 268                 return rc;
 269
 270         if (strtobool(&c, &bv) == 0) {
 271 #ifdef CONFIG_CIFS_STATS2
 272                 atomic_set(&totBufAllocCount, 0);
 273                 atomic_set(&totSmBufAllocCount, 0);
 274 #endif /* CONFIG_CIFS_STATS2 */
 275                 spin_lock(&cifs_tcp_ses_lock);
 276                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 277                         server = list_entry(tmp1, struct TCP_Server_Info,
 278                                             tcp_ses_list);
 279                         list_for_each(tmp2, &server->smb_ses_list) {
 280                                 ses = list_entry(tmp2, struct cifs_ses,
 281                                                  smb_ses_list);
 282                                 list_for_each(tmp3, &ses->tcon_list) {
 283                                         tcon = list_entry(tmp3,
 284                                                           struct cifs_tcon,
 285                                                           tcon_list);
 286                                         atomic_set(&tcon->num_smbs_sent, 0);
 287                                         if (server->ops->clear_stats)
 288                                                 server->ops->clear_stats(tcon);
 289                                 }
 290                         }
 291                 }
 292                 spin_unlock(&cifs_tcp_ses_lock);
 293         }
 294
 295         return count;
 296 }
 297
 298 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 299 {
 300         int i;
 301         struct list_head *tmp1, *tmp2, *tmp3;
 302         struct TCP_Server_Info *server;
 303         struct cifs_ses *ses;
 304         struct cifs_tcon *tcon;
 305
 306         seq_printf(m,
 307                         "Resources in use\nCIFS Session: %d\n",
 308                         sesInfoAllocCount.counter);
 309         seq_printf(m, "Share (unique mount targets): %d\n",
 310                         tconInfoAllocCount.counter);
 311         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 312                         bufAllocCount.counter,
 313                         cifs_min_rcv + tcpSesAllocCount.counter);
 314         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 315                         smBufAllocCount.counter, cifs_min_small);
 316 #ifdef CONFIG_CIFS_STATS2
 317         seq_printf(m, "Total Large %d Small %d Allocations\n",
 318                                 atomic_read(&totBufAllocCount),
 319                                 atomic_read(&totSmBufAllocCount));
 320 #endif /* CONFIG_CIFS_STATS2 */
 321
 322         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 323         seq_printf(m,
 324                 "\n%d session %d share reconnects\n",
 325                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 326
 327         seq_printf(m,
 328                 "Total vfs operations: %d maximum at one time: %d\n",
 329                 GlobalCurrentXid, GlobalMaxActiveXid);
 330
 331         i = 0;
 332         spin_lock(&cifs_tcp_ses_lock);
 333         list_for_each(tmp1, &cifs_tcp_ses_list) {
 334                 server = list_entry(tmp1, struct TCP_Server_Info,
 335                                     tcp_ses_list);
 336                 list_for_each(tmp2, &server->smb_ses_list) {
 337                         ses = list_entry(tmp2, struct cifs_ses,
 338                                          smb_ses_list);
 339                         list_for_each(tmp3, &ses->tcon_list) {
 340                                 tcon = list_entry(tmp3,
 341                                                   struct cifs_tcon,
 342                                                   tcon_list);
 343                                 i++;
 344                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 345                                 if (tcon->need_reconnect)
 346                                         seq_puts(m, "\tDISCONNECTED ");
 347                                 seq_printf(m, "\nSMBs: %d",
 348                                            atomic_read(&tcon->num_smbs_sent));
 349                                 if (server->ops->print_stats)
 350                                         server->ops->print_stats(m, tcon);
 351                         }
 352                 }
 353         }
 354         spin_unlock(&cifs_tcp_ses_lock);
 355
 356         seq_putc(m, '\n');
 357         return 0;
 358 }
 359
 360 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 361 {
 362         return single_open(file, cifs_stats_proc_show, NULL);
 363 }
 364
 365 static const struct file_operations cifs_stats_proc_fops = {
 366         .owner          = THIS_MODULE,
 367         .open           = cifs_stats_proc_open,
 368         .read           = seq_read,
 369         .llseek         = seq_lseek,
 370         .release        = single_release,
 371         .write          = cifs_stats_proc_write,
 372 };
 373 #endif /* STATS */
 374
 375 static struct proc_dir_entry *proc_fs_cifs;
 376 static const struct file_operations cifsFYI_proc_fops;
 377 static const struct file_operations cifs_lookup_cache_proc_fops;
 378 static const struct file_operations traceSMB_proc_fops;
 379 static const struct file_operations cifs_security_flags_proc_fops;
 380 static const struct file_operations cifs_linux_ext_proc_fops;
 381
 382 void
 383 cifs_proc_init(void)
 384 {
 385         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 386         if (proc_fs_cifs == NULL)
 387                 return;
 388
 389         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 390
 391 #ifdef CONFIG_CIFS_STATS
 392         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 393 #endif /* STATS */
 394         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 395         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 396         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 397                     &cifs_linux_ext_proc_fops);
 398         proc_create("SecurityFlags", 0, proc_fs_cifs,
 399                     &cifs_security_flags_proc_fops);
 400         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 401                     &cifs_lookup_cache_proc_fops);
 402 }
 403
 404 void
 405 cifs_proc_clean(void)
 406 {
 407         if (proc_fs_cifs == NULL)
 408                 return;
 409
 410         remove_proc_entry("DebugData", proc_fs_cifs);
 411         remove_proc_entry("cifsFYI", proc_fs_cifs);
 412         remove_proc_entry("traceSMB", proc_fs_cifs);
 413 #ifdef CONFIG_CIFS_STATS
 414         remove_proc_entry("Stats", proc_fs_cifs);
 415 #endif
 416         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 417         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 418         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 419         remove_proc_entry("fs/cifs", NULL);
 420 }
 421
 422 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 423 {
 424         seq_printf(m, "%d\n", cifsFYI);
 425         return 0;
 426 }
 427
 428 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 429 {
 430         return single_open(file, cifsFYI_proc_show, NULL);
 431 }
 432
 433 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 434                 size_t count, loff_t *ppos)
 435 {
 436         char c;
 437         bool bv;
 438         int rc;
 439
 440         rc = get_user(c, buffer);
 441         if (rc)
 442                 return rc;
 443         if (strtobool(&c, &bv) == 0)
 444                 cifsFYI = bv;
 445         else if ((c > '1') && (c <= '9'))
 446                 cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
 447
 448         return count;
 449 }
 450
 451 static const struct file_operations cifsFYI_proc_fops = {
 452         .owner          = THIS_MODULE,
 453         .open           = cifsFYI_proc_open,
 454         .read           = seq_read,
 455         .llseek         = seq_lseek,
 456         .release        = single_release,
 457         .write          = cifsFYI_proc_write,
 458 };
 459
 460 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 461 {
 462         seq_printf(m, "%d\n", linuxExtEnabled);
 463         return 0;
 464 }
 465
 466 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 467 {
 468         return single_open(file, cifs_linux_ext_proc_show, NULL);
 469 }
 470
 471 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 472                 const char __user *buffer, size_t count, loff_t *ppos)
 473 {
 474         char c;
 475         bool bv;
 476         int rc;
 477
 478         rc = get_user(c, buffer);
 479         if (rc)
 480                 return rc;
 481
 482         rc = strtobool(&c, &bv);
 483         if (rc)
 484                 return rc;
 485
 486         linuxExtEnabled = bv;
 487
 488         return count;
 489 }
 490
 491 static const struct file_operations cifs_linux_ext_proc_fops = {
 492         .owner          = THIS_MODULE,
 493         .open           = cifs_linux_ext_proc_open,
 494         .read           = seq_read,
 495         .llseek         = seq_lseek,
 496         .release        = single_release,
 497         .write          = cifs_linux_ext_proc_write,
 498 };
 499
 500 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 501 {
 502         seq_printf(m, "%d\n", lookupCacheEnabled);
 503         return 0;
 504 }
 505
 506 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 507 {
 508         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 509 }
 510
 511 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 512                 const char __user *buffer, size_t count, loff_t *ppos)
 513 {
 514         char c;
 515         bool bv;
 516         int rc;
 517
 518         rc = get_user(c, buffer);
 519         if (rc)
 520                 return rc;
 521
 522         rc = strtobool(&c, &bv);
 523         if (rc)
 524                 return rc;
 525
 526         lookupCacheEnabled = bv;
 527
 528         return count;
 529 }
 530
 531 static const struct file_operations cifs_lookup_cache_proc_fops = {
 532         .owner          = THIS_MODULE,
 533         .open           = cifs_lookup_cache_proc_open,
 534         .read           = seq_read,
 535         .llseek         = seq_lseek,
 536         .release        = single_release,
 537         .write          = cifs_lookup_cache_proc_write,
 538 };
 539
 540 static int traceSMB_proc_show(struct seq_file *m, void *v)
 541 {
 542         seq_printf(m, "%d\n", traceSMB);
 543         return 0;
 544 }
 545
 546 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 547 {
 548         return single_open(file, traceSMB_proc_show, NULL);
 549 }
 550
 551 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 552                 size_t count, loff_t *ppos)
 553 {
 554         char c;
 555         bool bv;
 556         int rc;
 557
 558         rc = get_user(c, buffer);
 559         if (rc)
 560                 return rc;
 561
 562         rc = strtobool(&c, &bv);
 563         if (rc)
 564                 return rc;
 565
 566         traceSMB = bv;
 567
 568         return count;
 569 }
 570
 571 static const struct file_operations traceSMB_proc_fops = {
 572         .owner          = THIS_MODULE,
 573         .open           = traceSMB_proc_open,
 574         .read           = seq_read,
 575         .llseek         = seq_lseek,
 576         .release        = single_release,
 577         .write          = traceSMB_proc_write,
 578 };
 579
 580 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 581 {
 582         seq_printf(m, "0x%x\n", global_secflags);
 583         return 0;
 584 }
 585
 586 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 587 {
 588         return single_open(file, cifs_security_flags_proc_show, NULL);
 589 }
 590
 591 /*
 592  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 593  * flags except for the ones corresponding to the given MUST flag. If there are
 594  * multiple MUST flags, then try to prefer more secure ones.
 595  */
 596 static void
 597 cifs_security_flags_handle_must_flags(unsigned int *flags)
 598 {
 599         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 600
 601         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 602                 *flags = CIFSSEC_MUST_KRB5;
 603         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 604                 *flags = CIFSSEC_MUST_NTLMSSP;
 605         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 606                 *flags = CIFSSEC_MUST_NTLMV2;
 607         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 608                 *flags = CIFSSEC_MUST_NTLM;
 609         else if (CIFSSEC_MUST_LANMAN &&
 610                  (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 611                 *flags = CIFSSEC_MUST_LANMAN;
 612         else if (CIFSSEC_MUST_PLNTXT &&
 613                  (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 614                 *flags = CIFSSEC_MUST_PLNTXT;
 615
 616         *flags |= signflags;
 617 }
 618
 619 static ssize_t cifs_security_flags_proc_write(struct file *file,
 620                 const char __user *buffer, size_t count, loff_t *ppos)
 621 {
 622         int rc;
 623         unsigned int flags;
 624         char flags_string[12];
 625         char c;
 626         bool bv;
 627
 628         if ((count < 1) || (count > 11))
 629                 return -EINVAL;
 630
 631         memset(flags_string, 0, 12);
 632
 633         if (copy_from_user(flags_string, buffer, count))
 634                 return -EFAULT;
 635
 636         if (count < 3) {
 637                 /* single char or single char followed by null */
 638                 c = flags_string[0];
 639                 if (strtobool(&c, &bv) == 0) {
 640                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 641                         return count;
 642                 } else if (!isdigit(c)) {
 643                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 644                                         flags_string);
 645                         return -EINVAL;
 646                 }
 647         }
 648
 649         /* else we have a number */
 650         rc = kstrtouint(flags_string, 0, &flags);
 651         if (rc) {
 652                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 653                                 flags_string);
 654                 return rc;
 655         }
 656
 657         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 658
 659         if (flags == 0)  {
 660                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 661                 return -EINVAL;
 662         }
 663
 664         if (flags & ~CIFSSEC_MASK) {
 665                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 666                          flags & ~CIFSSEC_MASK);
 667                 return -EINVAL;
 668         }
 669
 670         cifs_security_flags_handle_must_flags(&flags);
 671
 672         /* flags look ok - update the global security flags for cifs module */
 673         global_secflags = flags;
 674         if (global_secflags & CIFSSEC_MUST_SIGN) {
 675                 /* requiring signing implies signing is allowed */
 676                 global_secflags |= CIFSSEC_MAY_SIGN;
 677                 cifs_dbg(FYI, "packet signing now required\n");
 678         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 679                 cifs_dbg(FYI, "packet signing disabled\n");
 680         }
 681         /* BB should we turn on MAY flags for other MUST options? */
 682         return count;
 683 }
 684
 685 static const struct file_operations cifs_security_flags_proc_fops = {
 686         .owner          = THIS_MODULE,
 687         .open           = cifs_security_flags_proc_open,
 688         .read           = seq_read,
 689         .llseek         = seq_lseek,
 690         .release        = single_release,
 691         .write          = cifs_security_flags_proc_write,
 692 };
 693 #else
 694 inline void cifs_proc_init(void)
 695 {
 696 }
 697
 698 inline void cifs_proc_clean(void)
 699 {
 700 }
 701 #endif /* PROC_FS */