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 <linux/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 void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
 111 {
 112         __u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 113
 114         seq_printf(m, "%s Mounts: %d ", tcon->treeName, tcon->tc_count);
 115         if (tcon->nativeFileSystem)
 116                 seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
 117         seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
 118                    le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 119                    le32_to_cpu(tcon->fsAttrInfo.Attributes),
 120                    le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 121                    tcon->tidStatus);
 122         if (dev_type == FILE_DEVICE_DISK)
 123                 seq_puts(m, " type: DISK ");
 124         else if (dev_type == FILE_DEVICE_CD_ROM)
 125                 seq_puts(m, " type: CDROM ");
 126         else
 127                 seq_printf(m, " type: %d ", dev_type);
 128         if (tcon->ses->server->ops->dump_share_caps)
 129                 tcon->ses->server->ops->dump_share_caps(m, tcon);
 130
 131         if (tcon->need_reconnect)
 132                 seq_puts(m, "\tDISCONNECTED ");
 133         seq_putc(m, '\n');
 134 }
 135
 136 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 137 {
 138         struct list_head *tmp1, *tmp2, *tmp3;
 139         struct mid_q_entry *mid_entry;
 140         struct TCP_Server_Info *server;
 141         struct cifs_ses *ses;
 142         struct cifs_tcon *tcon;
 143         int i, j;
 144
 145         seq_puts(m,
 146                     "Display Internal CIFS Data Structures for Debugging\n"
 147                     "---------------------------------------------------\n");
 148         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 149         seq_printf(m, "Features:");
 150 #ifdef CONFIG_CIFS_DFS_UPCALL
 151         seq_printf(m, " dfs");
 152 #endif
 153 #ifdef CONFIG_CIFS_FSCACHE
 154         seq_printf(m, " fscache");
 155 #endif
 156 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 157         seq_printf(m, " lanman");
 158 #endif
 159 #ifdef CONFIG_CIFS_POSIX
 160         seq_printf(m, " posix");
 161 #endif
 162 #ifdef CONFIG_CIFS_UPCALL
 163         seq_printf(m, " spnego");
 164 #endif
 165 #ifdef CONFIG_CIFS_XATTR
 166         seq_printf(m, " xattr");
 167 #endif
 168 #ifdef CONFIG_CIFS_ACL
 169         seq_printf(m, " acl");
 170 #endif
 171         seq_putc(m, '\n');
 172         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 173         seq_printf(m, "Servers:");
 174
 175         i = 0;
 176         spin_lock(&cifs_tcp_ses_lock);
 177         list_for_each(tmp1, &cifs_tcp_ses_list) {
 178                 server = list_entry(tmp1, struct TCP_Server_Info,
 179                                     tcp_ses_list);
 180                 seq_printf(m, "\nNumber of credits: %d", server->credits);
 181                 i++;
 182                 list_for_each(tmp2, &server->smb_ses_list) {
 183                         ses = list_entry(tmp2, struct cifs_ses,
 184                                          smb_ses_list);
 185                         if ((ses->serverDomain == NULL) ||
 186                                 (ses->serverOS == NULL) ||
 187                                 (ses->serverNOS == NULL)) {
 188                                 seq_printf(m, "\n%d) Name: %s Uses: %d Capability: 0x%x\tSession Status: %d\t",
 189                                         i, ses->serverName, ses->ses_count,
 190                                         ses->capabilities, ses->status);
 191                                 if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 192                                         seq_printf(m, "Guest\t");
 193                                 else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 194                                         seq_printf(m, "Anonymous\t");
 195                         } else {
 196                                 seq_printf(m,
 197                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 198                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 199                                     " session status: %d\t",
 200                                 i, ses->serverName, ses->serverDomain,
 201                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 202                                 ses->capabilities, ses->status);
 203                         }
 204                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 205                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 206                                    server->tcpStatus, server->srv_count,
 207                                    server->sec_mode, in_flight(server));
 208
 209 #ifdef CONFIG_CIFS_STATS2
 210                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 211                                 atomic_read(&server->in_send),
 212                                 atomic_read(&server->num_waiters));
 213 #endif
 214
 215                         seq_puts(m, "\n\tShares:");
 216                         j = 0;
 217
 218                         seq_printf(m, "\n\t%d) IPC: ", j);
 219                         if (ses->tcon_ipc)
 220                                 cifs_debug_tcon(m, ses->tcon_ipc);
 221                         else
 222                                 seq_puts(m, "none\n");
 223
 224                         list_for_each(tmp3, &ses->tcon_list) {
 225                                 tcon = list_entry(tmp3, struct cifs_tcon,
 226                                                   tcon_list);
 227                                 ++j;
 228                                 seq_printf(m, "\n\t%d) ", j);
 229                                 cifs_debug_tcon(m, tcon);
 230                         }
 231
 232                         seq_puts(m, "\n\tMIDs:\n");
 233
 234                         spin_lock(&GlobalMid_Lock);
 235                         list_for_each(tmp3, &server->pending_mid_q) {
 236                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 237                                         qhead);
 238                                 seq_printf(m, "\tState: %d com: %d pid:"
 239                                               " %d cbdata: %p mid %llu\n",
 240                                               mid_entry->mid_state,
 241                                               le16_to_cpu(mid_entry->command),
 242                                               mid_entry->pid,
 243                                               mid_entry->callback_data,
 244                                               mid_entry->mid);
 245                         }
 246                         spin_unlock(&GlobalMid_Lock);
 247                 }
 248         }
 249         spin_unlock(&cifs_tcp_ses_lock);
 250         seq_putc(m, '\n');
 251
 252         /* BB add code to dump additional info such as TCP session info now */
 253         return 0;
 254 }
 255
 256 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 257 {
 258         return single_open(file, cifs_debug_data_proc_show, NULL);
 259 }
 260
 261 static const struct file_operations cifs_debug_data_proc_fops = {
 262         .open           = cifs_debug_data_proc_open,
 263         .read           = seq_read,
 264         .llseek         = seq_lseek,
 265         .release        = single_release,
 266 };
 267
 268 #ifdef CONFIG_CIFS_STATS
 269 static ssize_t cifs_stats_proc_write(struct file *file,
 270                 const char __user *buffer, size_t count, loff_t *ppos)
 271 {
 272         bool bv;
 273         int rc;
 274         struct list_head *tmp1, *tmp2, *tmp3;
 275         struct TCP_Server_Info *server;
 276         struct cifs_ses *ses;
 277         struct cifs_tcon *tcon;
 278
 279         rc = kstrtobool_from_user(buffer, count, &bv);
 280         if (rc == 0) {
 281 #ifdef CONFIG_CIFS_STATS2
 282                 atomic_set(&totBufAllocCount, 0);
 283                 atomic_set(&totSmBufAllocCount, 0);
 284 #endif /* CONFIG_CIFS_STATS2 */
 285                 spin_lock(&cifs_tcp_ses_lock);
 286                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 287                         server = list_entry(tmp1, struct TCP_Server_Info,
 288                                             tcp_ses_list);
 289                         list_for_each(tmp2, &server->smb_ses_list) {
 290                                 ses = list_entry(tmp2, struct cifs_ses,
 291                                                  smb_ses_list);
 292                                 list_for_each(tmp3, &ses->tcon_list) {
 293                                         tcon = list_entry(tmp3,
 294                                                           struct cifs_tcon,
 295                                                           tcon_list);
 296                                         atomic_set(&tcon->num_smbs_sent, 0);
 297                                         if (server->ops->clear_stats)
 298                                                 server->ops->clear_stats(tcon);
 299                                 }
 300                         }
 301                 }
 302                 spin_unlock(&cifs_tcp_ses_lock);
 303         } else {
 304                 return rc;
 305         }
 306
 307         return count;
 308 }
 309
 310 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 311 {
 312         int i;
 313         struct list_head *tmp1, *tmp2, *tmp3;
 314         struct TCP_Server_Info *server;
 315         struct cifs_ses *ses;
 316         struct cifs_tcon *tcon;
 317
 318         seq_printf(m,
 319                         "Resources in use\nCIFS Session: %d\n",
 320                         sesInfoAllocCount.counter);
 321         seq_printf(m, "Share (unique mount targets): %d\n",
 322                         tconInfoAllocCount.counter);
 323         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 324                         bufAllocCount.counter,
 325                         cifs_min_rcv + tcpSesAllocCount.counter);
 326         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 327                         smBufAllocCount.counter, cifs_min_small);
 328 #ifdef CONFIG_CIFS_STATS2
 329         seq_printf(m, "Total Large %d Small %d Allocations\n",
 330                                 atomic_read(&totBufAllocCount),
 331                                 atomic_read(&totSmBufAllocCount));
 332 #endif /* CONFIG_CIFS_STATS2 */
 333
 334         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 335         seq_printf(m,
 336                 "\n%d session %d share reconnects\n",
 337                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 338
 339         seq_printf(m,
 340                 "Total vfs operations: %d maximum at one time: %d\n",
 341                 GlobalCurrentXid, GlobalMaxActiveXid);
 342
 343         i = 0;
 344         spin_lock(&cifs_tcp_ses_lock);
 345         list_for_each(tmp1, &cifs_tcp_ses_list) {
 346                 server = list_entry(tmp1, struct TCP_Server_Info,
 347                                     tcp_ses_list);
 348                 list_for_each(tmp2, &server->smb_ses_list) {
 349                         ses = list_entry(tmp2, struct cifs_ses,
 350                                          smb_ses_list);
 351                         list_for_each(tmp3, &ses->tcon_list) {
 352                                 tcon = list_entry(tmp3,
 353                                                   struct cifs_tcon,
 354                                                   tcon_list);
 355                                 i++;
 356                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 357                                 if (tcon->need_reconnect)
 358                                         seq_puts(m, "\tDISCONNECTED ");
 359                                 seq_printf(m, "\nSMBs: %d",
 360                                            atomic_read(&tcon->num_smbs_sent));
 361                                 if (server->ops->print_stats)
 362                                         server->ops->print_stats(m, tcon);
 363                         }
 364                 }
 365         }
 366         spin_unlock(&cifs_tcp_ses_lock);
 367
 368         seq_putc(m, '\n');
 369         return 0;
 370 }
 371
 372 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 373 {
 374         return single_open(file, cifs_stats_proc_show, NULL);
 375 }
 376
 377 static const struct file_operations cifs_stats_proc_fops = {
 378         .open           = cifs_stats_proc_open,
 379         .read           = seq_read,
 380         .llseek         = seq_lseek,
 381         .release        = single_release,
 382         .write          = cifs_stats_proc_write,
 383 };
 384 #endif /* STATS */
 385
 386 static struct proc_dir_entry *proc_fs_cifs;
 387 static const struct file_operations cifsFYI_proc_fops;
 388 static const struct file_operations cifs_lookup_cache_proc_fops;
 389 static const struct file_operations traceSMB_proc_fops;
 390 static const struct file_operations cifs_security_flags_proc_fops;
 391 static const struct file_operations cifs_linux_ext_proc_fops;
 392
 393 void
 394 cifs_proc_init(void)
 395 {
 396         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 397         if (proc_fs_cifs == NULL)
 398                 return;
 399
 400         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 401
 402 #ifdef CONFIG_CIFS_STATS
 403         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 404 #endif /* STATS */
 405         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 406         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 407         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 408                     &cifs_linux_ext_proc_fops);
 409         proc_create("SecurityFlags", 0, proc_fs_cifs,
 410                     &cifs_security_flags_proc_fops);
 411         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 412                     &cifs_lookup_cache_proc_fops);
 413 }
 414
 415 void
 416 cifs_proc_clean(void)
 417 {
 418         if (proc_fs_cifs == NULL)
 419                 return;
 420
 421         remove_proc_entry("DebugData", proc_fs_cifs);
 422         remove_proc_entry("cifsFYI", proc_fs_cifs);
 423         remove_proc_entry("traceSMB", proc_fs_cifs);
 424 #ifdef CONFIG_CIFS_STATS
 425         remove_proc_entry("Stats", proc_fs_cifs);
 426 #endif
 427         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 428         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 429         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 430         remove_proc_entry("fs/cifs", NULL);
 431 }
 432
 433 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 434 {
 435         seq_printf(m, "%d\n", cifsFYI);
 436         return 0;
 437 }
 438
 439 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 440 {
 441         return single_open(file, cifsFYI_proc_show, NULL);
 442 }
 443
 444 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 445                 size_t count, loff_t *ppos)
 446 {
 447         char c[2] = { '\0' };
 448         bool bv;
 449         int rc;
 450
 451         rc = get_user(c[0], buffer);
 452         if (rc)
 453                 return rc;
 454         if (strtobool(c, &bv) == 0)
 455                 cifsFYI = bv;
 456         else if ((c[0] > '1') && (c[0] <= '9'))
 457                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 458
 459         return count;
 460 }
 461
 462 static const struct file_operations cifsFYI_proc_fops = {
 463         .open           = cifsFYI_proc_open,
 464         .read           = seq_read,
 465         .llseek         = seq_lseek,
 466         .release        = single_release,
 467         .write          = cifsFYI_proc_write,
 468 };
 469
 470 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 471 {
 472         seq_printf(m, "%d\n", linuxExtEnabled);
 473         return 0;
 474 }
 475
 476 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 477 {
 478         return single_open(file, cifs_linux_ext_proc_show, NULL);
 479 }
 480
 481 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 482                 const char __user *buffer, size_t count, loff_t *ppos)
 483 {
 484         int rc;
 485
 486         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 487         if (rc)
 488                 return rc;
 489
 490         return count;
 491 }
 492
 493 static const struct file_operations cifs_linux_ext_proc_fops = {
 494         .open           = cifs_linux_ext_proc_open,
 495         .read           = seq_read,
 496         .llseek         = seq_lseek,
 497         .release        = single_release,
 498         .write          = cifs_linux_ext_proc_write,
 499 };
 500
 501 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 502 {
 503         seq_printf(m, "%d\n", lookupCacheEnabled);
 504         return 0;
 505 }
 506
 507 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 508 {
 509         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 510 }
 511
 512 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 513                 const char __user *buffer, size_t count, loff_t *ppos)
 514 {
 515         int rc;
 516
 517         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
 518         if (rc)
 519                 return rc;
 520
 521         return count;
 522 }
 523
 524 static const struct file_operations cifs_lookup_cache_proc_fops = {
 525         .open           = cifs_lookup_cache_proc_open,
 526         .read           = seq_read,
 527         .llseek         = seq_lseek,
 528         .release        = single_release,
 529         .write          = cifs_lookup_cache_proc_write,
 530 };
 531
 532 static int traceSMB_proc_show(struct seq_file *m, void *v)
 533 {
 534         seq_printf(m, "%d\n", traceSMB);
 535         return 0;
 536 }
 537
 538 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 539 {
 540         return single_open(file, traceSMB_proc_show, NULL);
 541 }
 542
 543 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 544                 size_t count, loff_t *ppos)
 545 {
 546         int rc;
 547
 548         rc = kstrtobool_from_user(buffer, count, &traceSMB);
 549         if (rc)
 550                 return rc;
 551
 552         return count;
 553 }
 554
 555 static const struct file_operations traceSMB_proc_fops = {
 556         .open           = traceSMB_proc_open,
 557         .read           = seq_read,
 558         .llseek         = seq_lseek,
 559         .release        = single_release,
 560         .write          = traceSMB_proc_write,
 561 };
 562
 563 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 564 {
 565         seq_printf(m, "0x%x\n", global_secflags);
 566         return 0;
 567 }
 568
 569 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 570 {
 571         return single_open(file, cifs_security_flags_proc_show, NULL);
 572 }
 573
 574 /*
 575  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 576  * flags except for the ones corresponding to the given MUST flag. If there are
 577  * multiple MUST flags, then try to prefer more secure ones.
 578  */
 579 static void
 580 cifs_security_flags_handle_must_flags(unsigned int *flags)
 581 {
 582         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 583
 584         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 585                 *flags = CIFSSEC_MUST_KRB5;
 586         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 587                 *flags = CIFSSEC_MUST_NTLMSSP;
 588         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 589                 *flags = CIFSSEC_MUST_NTLMV2;
 590         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 591                 *flags = CIFSSEC_MUST_NTLM;
 592         else if (CIFSSEC_MUST_LANMAN &&
 593                  (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 594                 *flags = CIFSSEC_MUST_LANMAN;
 595         else if (CIFSSEC_MUST_PLNTXT &&
 596                  (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 597                 *flags = CIFSSEC_MUST_PLNTXT;
 598
 599         *flags |= signflags;
 600 }
 601
 602 static ssize_t cifs_security_flags_proc_write(struct file *file,
 603                 const char __user *buffer, size_t count, loff_t *ppos)
 604 {
 605         int rc;
 606         unsigned int flags;
 607         char flags_string[12];
 608         bool bv;
 609
 610         if ((count < 1) || (count > 11))
 611                 return -EINVAL;
 612
 613         memset(flags_string, 0, 12);
 614
 615         if (copy_from_user(flags_string, buffer, count))
 616                 return -EFAULT;
 617
 618         if (count < 3) {
 619                 /* single char or single char followed by null */
 620                 if (strtobool(flags_string, &bv) == 0) {
 621                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 622                         return count;
 623                 } else if (!isdigit(flags_string[0])) {
 624                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 625                                         flags_string);
 626                         return -EINVAL;
 627                 }
 628         }
 629
 630         /* else we have a number */
 631         rc = kstrtouint(flags_string, 0, &flags);
 632         if (rc) {
 633                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 634                                 flags_string);
 635                 return rc;
 636         }
 637
 638         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 639
 640         if (flags == 0)  {
 641                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 642                 return -EINVAL;
 643         }
 644
 645         if (flags & ~CIFSSEC_MASK) {
 646                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 647                          flags & ~CIFSSEC_MASK);
 648                 return -EINVAL;
 649         }
 650
 651         cifs_security_flags_handle_must_flags(&flags);
 652
 653         /* flags look ok - update the global security flags for cifs module */
 654         global_secflags = flags;
 655         if (global_secflags & CIFSSEC_MUST_SIGN) {
 656                 /* requiring signing implies signing is allowed */
 657                 global_secflags |= CIFSSEC_MAY_SIGN;
 658                 cifs_dbg(FYI, "packet signing now required\n");
 659         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 660                 cifs_dbg(FYI, "packet signing disabled\n");
 661         }
 662         /* BB should we turn on MAY flags for other MUST options? */
 663         return count;
 664 }
 665
 666 static const struct file_operations cifs_security_flags_proc_fops = {
 667         .open           = cifs_security_flags_proc_open,
 668         .read           = seq_read,
 669         .llseek         = seq_lseek,
 670         .release        = single_release,
 671         .write          = cifs_security_flags_proc_write,
 672 };
 673 #else
 674 inline void cifs_proc_init(void)
 675 {
 676 }
 677
 678 inline void cifs_proc_clean(void)
 679 {
 680 }
 681 #endif /* PROC_FS */