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_SMB_DIRECT
 132         seq_printf(m, ",SMB_DIRECT");
 133 #endif
 134 #ifdef CONFIG_CIFS_STATS2
 135         seq_printf(m, ",STATS2");
 136 #elif defined(CONFIG_CIFS_STATS)
 137         seq_printf(m, ",STATS");
 138 #endif
 139 #ifdef CONFIG_CIFS_DEBUG2
 140         seq_printf(m, ",DEBUG2");
 141 #elif defined(CONFIG_CIFS_DEBUG)
 142         seq_printf(m, ",DEBUG");
 143 #endif
 144 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 145         seq_printf(m, ",ALLOW_INSECURE_LEGACY");
 146 #endif
 147 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 148         seq_printf(m, ",WEAK_PW_HASH");
 149 #endif
 150 #ifdef CONFIG_CIFS_POSIX
 151         seq_printf(m, ",CIFS_POSIX");
 152 #endif
 153 #ifdef CONFIG_CIFS_UPCALL
 154         seq_printf(m, ",UPCALL(SPNEGO)");
 155 #endif
 156 #ifdef CONFIG_CIFS_XATTR
 157         seq_printf(m, ",XATTR");
 158 #endif
 159 #ifdef CONFIG_CIFS_ACL
 160         seq_printf(m, ",ACL");
 161 #endif
 162         seq_putc(m, '\n');
 163         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 164         seq_printf(m, "Servers:");
 165
 166         i = 0;
 167         spin_lock(&cifs_tcp_ses_lock);
 168         list_for_each(tmp1, &cifs_tcp_ses_list) {
 169                 server = list_entry(tmp1, struct TCP_Server_Info,
 170                                     tcp_ses_list);
 171                 seq_printf(m, "\nNumber of credits: %d", server->credits);
 172                 i++;
 173                 list_for_each(tmp2, &server->smb_ses_list) {
 174                         ses = list_entry(tmp2, struct cifs_ses,
 175                                          smb_ses_list);
 176                         if ((ses->serverDomain == NULL) ||
 177                                 (ses->serverOS == NULL) ||
 178                                 (ses->serverNOS == NULL)) {
 179                                 seq_printf(m, "\n%d) entry for %s not fully "
 180                                            "displayed\n\t", i, ses->serverName);
 181                         } else {
 182                                 seq_printf(m,
 183                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 184                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 185                                     " session status: %d\t",
 186                                 i, ses->serverName, ses->serverDomain,
 187                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 188                                 ses->capabilities, ses->status);
 189                         }
 190                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 191                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 192                                    server->tcpStatus, server->srv_count,
 193                                    server->sec_mode, in_flight(server));
 194
 195 #ifdef CONFIG_CIFS_STATS2
 196                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 197                                 atomic_read(&server->in_send),
 198                                 atomic_read(&server->num_waiters));
 199 #endif
 200
 201                         seq_puts(m, "\n\tShares:");
 202                         j = 0;
 203                         list_for_each(tmp3, &ses->tcon_list) {
 204                                 tcon = list_entry(tmp3, struct cifs_tcon,
 205                                                   tcon_list);
 206                                 ++j;
 207                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 208                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 209                                            tcon->treeName, tcon->tc_count);
 210                                 if (tcon->nativeFileSystem) {
 211                                         seq_printf(m, "Type: %s ",
 212                                                    tcon->nativeFileSystem);
 213                                 }
 214                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 215                                         "\n\tPathComponentMax: %d Status: %d",
 216                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 217                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 218                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 219                                         tcon->tidStatus);
 220                                 if (dev_type == FILE_DEVICE_DISK)
 221                                         seq_puts(m, " type: DISK ");
 222                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 223                                         seq_puts(m, " type: CDROM ");
 224                                 else
 225                                         seq_printf(m, " type: %d ", dev_type);
 226                                 if (server->ops->dump_share_caps)
 227                                         server->ops->dump_share_caps(m, tcon);
 228
 229                                 if (tcon->need_reconnect)
 230                                         seq_puts(m, "\tDISCONNECTED ");
 231                                 seq_putc(m, '\n');
 232                         }
 233
 234                         seq_puts(m, "\n\tMIDs:\n");
 235
 236                         spin_lock(&GlobalMid_Lock);
 237                         list_for_each(tmp3, &server->pending_mid_q) {
 238                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 239                                         qhead);
 240                                 seq_printf(m, "\tState: %d com: %d pid:"
 241                                               " %d cbdata: %p mid %llu\n",
 242                                               mid_entry->mid_state,
 243                                               le16_to_cpu(mid_entry->command),
 244                                               mid_entry->pid,
 245                                               mid_entry->callback_data,
 246                                               mid_entry->mid);
 247                         }
 248                         spin_unlock(&GlobalMid_Lock);
 249                 }
 250         }
 251         spin_unlock(&cifs_tcp_ses_lock);
 252         seq_putc(m, '\n');
 253
 254         /* BB add code to dump additional info such as TCP session info now */
 255         return 0;
 256 }
 257
 258 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 259 {
 260         return single_open(file, cifs_debug_data_proc_show, NULL);
 261 }
 262
 263 static const struct file_operations cifs_debug_data_proc_fops = {
 264         .owner          = THIS_MODULE,
 265         .open           = cifs_debug_data_proc_open,
 266         .read           = seq_read,
 267         .llseek         = seq_lseek,
 268         .release        = single_release,
 269 };
 270
 271 #ifdef CONFIG_CIFS_STATS
 272 static ssize_t cifs_stats_proc_write(struct file *file,
 273                 const char __user *buffer, size_t count, loff_t *ppos)
 274 {
 275         bool bv;
 276         int rc;
 277         struct list_head *tmp1, *tmp2, *tmp3;
 278         struct TCP_Server_Info *server;
 279         struct cifs_ses *ses;
 280         struct cifs_tcon *tcon;
 281
 282         rc = kstrtobool_from_user(buffer, count, &bv);
 283         if (rc == 0) {
 284 #ifdef CONFIG_CIFS_STATS2
 285                 atomic_set(&totBufAllocCount, 0);
 286                 atomic_set(&totSmBufAllocCount, 0);
 287 #endif /* CONFIG_CIFS_STATS2 */
 288                 atomic_set(&tcpSesReconnectCount, 0);
 289                 atomic_set(&tconInfoReconnectCount, 0);
 290
 291                 spin_lock(&GlobalMid_Lock);
 292                 GlobalMaxActiveXid = 0;
 293                 GlobalCurrentXid = 0;
 294                 spin_unlock(&GlobalMid_Lock);
 295                 spin_lock(&cifs_tcp_ses_lock);
 296                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 297                         server = list_entry(tmp1, struct TCP_Server_Info,
 298                                             tcp_ses_list);
 299                         list_for_each(tmp2, &server->smb_ses_list) {
 300                                 ses = list_entry(tmp2, struct cifs_ses,
 301                                                  smb_ses_list);
 302                                 list_for_each(tmp3, &ses->tcon_list) {
 303                                         tcon = list_entry(tmp3,
 304                                                           struct cifs_tcon,
 305                                                           tcon_list);
 306                                         atomic_set(&tcon->num_smbs_sent, 0);
 307                                         spin_lock(&tcon->stat_lock);
 308                                         tcon->bytes_read = 0;
 309                                         tcon->bytes_written = 0;
 310                                         spin_unlock(&tcon->stat_lock);
 311                                         if (server->ops->clear_stats)
 312                                                 server->ops->clear_stats(tcon);
 313                                 }
 314                         }
 315                 }
 316                 spin_unlock(&cifs_tcp_ses_lock);
 317         } else {
 318                 return rc;
 319         }
 320
 321         return count;
 322 }
 323
 324 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 325 {
 326         int i;
 327         struct list_head *tmp1, *tmp2, *tmp3;
 328         struct TCP_Server_Info *server;
 329         struct cifs_ses *ses;
 330         struct cifs_tcon *tcon;
 331
 332         seq_printf(m,
 333                         "Resources in use\nCIFS Session: %d\n",
 334                         sesInfoAllocCount.counter);
 335         seq_printf(m, "Share (unique mount targets): %d\n",
 336                         tconInfoAllocCount.counter);
 337         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 338                         bufAllocCount.counter,
 339                         cifs_min_rcv + tcpSesAllocCount.counter);
 340         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 341                         smBufAllocCount.counter, cifs_min_small);
 342 #ifdef CONFIG_CIFS_STATS2
 343         seq_printf(m, "Total Large %d Small %d Allocations\n",
 344                                 atomic_read(&totBufAllocCount),
 345                                 atomic_read(&totSmBufAllocCount));
 346 #endif /* CONFIG_CIFS_STATS2 */
 347
 348         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 349         seq_printf(m,
 350                 "\n%d session %d share reconnects\n",
 351                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 352
 353         seq_printf(m,
 354                 "Total vfs operations: %d maximum at one time: %d\n",
 355                 GlobalCurrentXid, GlobalMaxActiveXid);
 356
 357         i = 0;
 358         spin_lock(&cifs_tcp_ses_lock);
 359         list_for_each(tmp1, &cifs_tcp_ses_list) {
 360                 server = list_entry(tmp1, struct TCP_Server_Info,
 361                                     tcp_ses_list);
 362                 list_for_each(tmp2, &server->smb_ses_list) {
 363                         ses = list_entry(tmp2, struct cifs_ses,
 364                                          smb_ses_list);
 365                         list_for_each(tmp3, &ses->tcon_list) {
 366                                 tcon = list_entry(tmp3,
 367                                                   struct cifs_tcon,
 368                                                   tcon_list);
 369                                 i++;
 370                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 371                                 if (tcon->need_reconnect)
 372                                         seq_puts(m, "\tDISCONNECTED ");
 373                                 seq_printf(m, "\nSMBs: %d",
 374                                            atomic_read(&tcon->num_smbs_sent));
 375                                 if (server->ops->print_stats)
 376                                         server->ops->print_stats(m, tcon);
 377                         }
 378                 }
 379         }
 380         spin_unlock(&cifs_tcp_ses_lock);
 381
 382         seq_putc(m, '\n');
 383         return 0;
 384 }
 385
 386 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 387 {
 388         return single_open(file, cifs_stats_proc_show, NULL);
 389 }
 390
 391 static const struct file_operations cifs_stats_proc_fops = {
 392         .owner          = THIS_MODULE,
 393         .open           = cifs_stats_proc_open,
 394         .read           = seq_read,
 395         .llseek         = seq_lseek,
 396         .release        = single_release,
 397         .write          = cifs_stats_proc_write,
 398 };
 399 #endif /* STATS */
 400
 401 static struct proc_dir_entry *proc_fs_cifs;
 402 static const struct file_operations cifsFYI_proc_fops;
 403 static const struct file_operations cifs_lookup_cache_proc_fops;
 404 static const struct file_operations traceSMB_proc_fops;
 405 static const struct file_operations cifs_security_flags_proc_fops;
 406 static const struct file_operations cifs_linux_ext_proc_fops;
 407
 408 void
 409 cifs_proc_init(void)
 410 {
 411         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 412         if (proc_fs_cifs == NULL)
 413                 return;
 414
 415         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 416
 417 #ifdef CONFIG_CIFS_STATS
 418         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 419 #endif /* STATS */
 420         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 421         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 422         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 423                     &cifs_linux_ext_proc_fops);
 424         proc_create("SecurityFlags", 0, proc_fs_cifs,
 425                     &cifs_security_flags_proc_fops);
 426         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 427                     &cifs_lookup_cache_proc_fops);
 428 }
 429
 430 void
 431 cifs_proc_clean(void)
 432 {
 433         if (proc_fs_cifs == NULL)
 434                 return;
 435
 436         remove_proc_entry("DebugData", proc_fs_cifs);
 437         remove_proc_entry("cifsFYI", proc_fs_cifs);
 438         remove_proc_entry("traceSMB", proc_fs_cifs);
 439 #ifdef CONFIG_CIFS_STATS
 440         remove_proc_entry("Stats", proc_fs_cifs);
 441 #endif
 442         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 443         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 444         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 445         remove_proc_entry("fs/cifs", NULL);
 446 }
 447
 448 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 449 {
 450         seq_printf(m, "%d\n", cifsFYI);
 451         return 0;
 452 }
 453
 454 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 455 {
 456         return single_open(file, cifsFYI_proc_show, NULL);
 457 }
 458
 459 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 460                 size_t count, loff_t *ppos)
 461 {
 462         char c[2] = { '\0' };
 463         bool bv;
 464         int rc;
 465
 466         rc = get_user(c[0], buffer);
 467         if (rc)
 468                 return rc;
 469         if (strtobool(c, &bv) == 0)
 470                 cifsFYI = bv;
 471         else if ((c[0] > '1') && (c[0] <= '9'))
 472                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 473
 474         return count;
 475 }
 476
 477 static const struct file_operations cifsFYI_proc_fops = {
 478         .owner          = THIS_MODULE,
 479         .open           = cifsFYI_proc_open,
 480         .read           = seq_read,
 481         .llseek         = seq_lseek,
 482         .release        = single_release,
 483         .write          = cifsFYI_proc_write,
 484 };
 485
 486 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 487 {
 488         seq_printf(m, "%d\n", linuxExtEnabled);
 489         return 0;
 490 }
 491
 492 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 493 {
 494         return single_open(file, cifs_linux_ext_proc_show, NULL);
 495 }
 496
 497 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 498                 const char __user *buffer, size_t count, loff_t *ppos)
 499 {
 500         int rc;
 501
 502         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 503         if (rc)
 504                 return rc;
 505
 506         return count;
 507 }
 508
 509 static const struct file_operations cifs_linux_ext_proc_fops = {
 510         .owner          = THIS_MODULE,
 511         .open           = cifs_linux_ext_proc_open,
 512         .read           = seq_read,
 513         .llseek         = seq_lseek,
 514         .release        = single_release,
 515         .write          = cifs_linux_ext_proc_write,
 516 };
 517
 518 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 519 {
 520         seq_printf(m, "%d\n", lookupCacheEnabled);
 521         return 0;
 522 }
 523
 524 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 525 {
 526         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 527 }
 528
 529 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 530                 const char __user *buffer, size_t count, loff_t *ppos)
 531 {
 532         int rc;
 533
 534         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
 535         if (rc)
 536                 return rc;
 537
 538         return count;
 539 }
 540
 541 static const struct file_operations cifs_lookup_cache_proc_fops = {
 542         .owner          = THIS_MODULE,
 543         .open           = cifs_lookup_cache_proc_open,
 544         .read           = seq_read,
 545         .llseek         = seq_lseek,
 546         .release        = single_release,
 547         .write          = cifs_lookup_cache_proc_write,
 548 };
 549
 550 static int traceSMB_proc_show(struct seq_file *m, void *v)
 551 {
 552         seq_printf(m, "%d\n", traceSMB);
 553         return 0;
 554 }
 555
 556 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 557 {
 558         return single_open(file, traceSMB_proc_show, NULL);
 559 }
 560
 561 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 562                 size_t count, loff_t *ppos)
 563 {
 564         int rc;
 565
 566         rc = kstrtobool_from_user(buffer, count, &traceSMB);
 567         if (rc)
 568                 return rc;
 569
 570         return count;
 571 }
 572
 573 static const struct file_operations traceSMB_proc_fops = {
 574         .owner          = THIS_MODULE,
 575         .open           = traceSMB_proc_open,
 576         .read           = seq_read,
 577         .llseek         = seq_lseek,
 578         .release        = single_release,
 579         .write          = traceSMB_proc_write,
 580 };
 581
 582 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 583 {
 584         seq_printf(m, "0x%x\n", global_secflags);
 585         return 0;
 586 }
 587
 588 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 589 {
 590         return single_open(file, cifs_security_flags_proc_show, NULL);
 591 }
 592
 593 /*
 594  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 595  * flags except for the ones corresponding to the given MUST flag. If there are
 596  * multiple MUST flags, then try to prefer more secure ones.
 597  */
 598 static void
 599 cifs_security_flags_handle_must_flags(unsigned int *flags)
 600 {
 601         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 602
 603         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 604                 *flags = CIFSSEC_MUST_KRB5;
 605         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 606                 *flags = CIFSSEC_MUST_NTLMSSP;
 607         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 608                 *flags = CIFSSEC_MUST_NTLMV2;
 609         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 610                 *flags = CIFSSEC_MUST_NTLM;
 611         else if (CIFSSEC_MUST_LANMAN &&
 612                  (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 613                 *flags = CIFSSEC_MUST_LANMAN;
 614         else if (CIFSSEC_MUST_PLNTXT &&
 615                  (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 616                 *flags = CIFSSEC_MUST_PLNTXT;
 617
 618         *flags |= signflags;
 619 }
 620
 621 static ssize_t cifs_security_flags_proc_write(struct file *file,
 622                 const char __user *buffer, size_t count, loff_t *ppos)
 623 {
 624         int rc;
 625         unsigned int flags;
 626         char flags_string[12];
 627         bool bv;
 628
 629         if ((count < 1) || (count > 11))
 630                 return -EINVAL;
 631
 632         memset(flags_string, 0, 12);
 633
 634         if (copy_from_user(flags_string, buffer, count))
 635                 return -EFAULT;
 636
 637         if (count < 3) {
 638                 /* single char or single char followed by null */
 639                 if (strtobool(flags_string, &bv) == 0) {
 640                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 641                         return count;
 642                 } else if (!isdigit(flags_string[0])) {
 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 */