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         int i, j;
  38         int *intptr = data;
  39         char *charptr = data;
  40         char buf[10], line[80];
  41
  42         printk(KERN_DEBUG "%s: dump of %d bytes of data at 0x%p\n",
  43                 label, length, data);
  44         for (i = 0; i < length; i += 16) {
  45                 line[0] = 0;
  46                 for (j = 0; (j < 4) && (i + j * 4 < length); j++) {
  47                         sprintf(buf, " %08x", intptr[i / 4 + j]);
  48                         strcat(line, buf);
  49                 }
  50                 buf[0] = ' ';
  51                 buf[2] = 0;
  52                 for (j = 0; (j < 16) && (i + j < length); j++) {
  53                         buf[1] = isprint(charptr[i + j]) ? charptr[i + j] : '.';
  54                         strcat(line, buf);
  55                 }
  56                 printk(KERN_DEBUG "%s\n", line);
  57         }
  58 }
  59
  60 #ifdef CONFIG_CIFS_DEBUG
  61 void cifs_vfs_err(const char *fmt, ...)
  62 {
  63         struct va_format vaf;
  64         va_list args;
  65
  66         va_start(args, fmt);
  67
  68         vaf.fmt = fmt;
  69         vaf.va = &args;
  70
  71         printk(KERN_ERR "CIFS VFS: %pV", &vaf);
  72
  73         va_end(args);
  74 }
  75 #endif
  76
  77 void cifs_dump_detail(void *buf)
  78 {
  79 #ifdef CONFIG_CIFS_DEBUG2
  80         struct smb_hdr *smb = (struct smb_hdr *)buf;
  81
  82         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
  83                  smb->Command, smb->Status.CifsError,
  84                  smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  85         cifs_dbg(VFS, "smb buf %p len %u\n", smb, smbCalcSize(smb));
  86 #endif /* CONFIG_CIFS_DEBUG2 */
  87 }
  88
  89 void cifs_dump_mids(struct TCP_Server_Info *server)
  90 {
  91 #ifdef CONFIG_CIFS_DEBUG2
  92         struct list_head *tmp;
  93         struct mid_q_entry *mid_entry;
  94
  95         if (server == NULL)
  96                 return;
  97
  98         cifs_dbg(VFS, "Dump pending requests:\n");
  99         spin_lock(&GlobalMid_Lock);
 100         list_for_each(tmp, &server->pending_mid_q) {
 101                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 102                 cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
 103                          mid_entry->mid_state,
 104                          le16_to_cpu(mid_entry->command),
 105                          mid_entry->pid,
 106                          mid_entry->callback_data,
 107                          mid_entry->mid);
 108 #ifdef CONFIG_CIFS_STATS2
 109                 cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
 110                          mid_entry->large_buf,
 111                          mid_entry->resp_buf,
 112                          mid_entry->when_received,
 113                          jiffies);
 114 #endif /* STATS2 */
 115                 cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
 116                          mid_entry->multiRsp, mid_entry->multiEnd);
 117                 if (mid_entry->resp_buf) {
 118                         cifs_dump_detail(mid_entry->resp_buf);
 119                         cifs_dump_mem("existing buf: ",
 120                                 mid_entry->resp_buf, 62);
 121                 }
 122         }
 123         spin_unlock(&GlobalMid_Lock);
 124 #endif /* CONFIG_CIFS_DEBUG2 */
 125 }
 126
 127 #ifdef CONFIG_PROC_FS
 128 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 129 {
 130         struct list_head *tmp1, *tmp2, *tmp3;
 131         struct mid_q_entry *mid_entry;
 132         struct TCP_Server_Info *server;
 133         struct cifs_ses *ses;
 134         struct cifs_tcon *tcon;
 135         int i, j;
 136         __u32 dev_type;
 137
 138         seq_puts(m,
 139                     "Display Internal CIFS Data Structures for Debugging\n"
 140                     "---------------------------------------------------\n");
 141         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 142         seq_printf(m, "Features:");
 143 #ifdef CONFIG_CIFS_DFS_UPCALL
 144         seq_printf(m, " dfs");
 145 #endif
 146 #ifdef CONFIG_CIFS_FSCACHE
 147         seq_printf(m, " fscache");
 148 #endif
 149 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 150         seq_printf(m, " lanman");
 151 #endif
 152 #ifdef CONFIG_CIFS_POSIX
 153         seq_printf(m, " posix");
 154 #endif
 155 #ifdef CONFIG_CIFS_UPCALL
 156         seq_printf(m, " spnego");
 157 #endif
 158 #ifdef CONFIG_CIFS_XATTR
 159         seq_printf(m, " xattr");
 160 #endif
 161 #ifdef CONFIG_CIFS_ACL
 162         seq_printf(m, " acl");
 163 #endif
 164         seq_putc(m, '\n');
 165         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 166         seq_printf(m, "Servers:");
 167
 168         i = 0;
 169         spin_lock(&cifs_tcp_ses_lock);
 170         list_for_each(tmp1, &cifs_tcp_ses_list) {
 171                 server = list_entry(tmp1, struct TCP_Server_Info,
 172                                     tcp_ses_list);
 173                 i++;
 174                 list_for_each(tmp2, &server->smb_ses_list) {
 175                         ses = list_entry(tmp2, struct cifs_ses,
 176                                          smb_ses_list);
 177                         if ((ses->serverDomain == NULL) ||
 178                                 (ses->serverOS == NULL) ||
 179                                 (ses->serverNOS == NULL)) {
 180                                 seq_printf(m, "\n%d) entry for %s not fully "
 181                                            "displayed\n\t", i, ses->serverName);
 182                         } else {
 183                                 seq_printf(m,
 184                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 185                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 186                                     " session status: %d\t",
 187                                 i, ses->serverName, ses->serverDomain,
 188                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 189                                 ses->capabilities, ses->status);
 190                         }
 191                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 192                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 193                                    server->tcpStatus, server->srv_count,
 194                                    server->sec_mode, in_flight(server));
 195
 196 #ifdef CONFIG_CIFS_STATS2
 197                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 198                                 atomic_read(&server->in_send),
 199                                 atomic_read(&server->num_waiters));
 200 #endif
 201
 202                         seq_puts(m, "\n\tShares:");
 203                         j = 0;
 204                         list_for_each(tmp3, &ses->tcon_list) {
 205                                 tcon = list_entry(tmp3, struct cifs_tcon,
 206                                                   tcon_list);
 207                                 ++j;
 208                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 209                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 210                                            tcon->treeName, tcon->tc_count);
 211                                 if (tcon->nativeFileSystem) {
 212                                         seq_printf(m, "Type: %s ",
 213                                                    tcon->nativeFileSystem);
 214                                 }
 215                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 216                                         "\n\tPathComponentMax: %d Status: %d",
 217                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 218                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 219                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 220                                         tcon->tidStatus);
 221                                 if (dev_type == FILE_DEVICE_DISK)
 222                                         seq_puts(m, " type: DISK ");
 223                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 224                                         seq_puts(m, " type: CDROM ");
 225                                 else
 226                                         seq_printf(m, " type: %d ", dev_type);
 227                                 if (server->ops->dump_share_caps)
 228                                         server->ops->dump_share_caps(m, tcon);
 229
 230                                 if (tcon->need_reconnect)
 231                                         seq_puts(m, "\tDISCONNECTED ");
 232                                 seq_putc(m, '\n');
 233                         }
 234
 235                         seq_puts(m, "\n\tMIDs:\n");
 236
 237                         spin_lock(&GlobalMid_Lock);
 238                         list_for_each(tmp3, &server->pending_mid_q) {
 239                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 240                                         qhead);
 241                                 seq_printf(m, "\tState: %d com: %d pid:"
 242                                               " %d cbdata: %p mid %llu\n",
 243                                               mid_entry->mid_state,
 244                                               le16_to_cpu(mid_entry->command),
 245                                               mid_entry->pid,
 246                                               mid_entry->callback_data,
 247                                               mid_entry->mid);
 248                         }
 249                         spin_unlock(&GlobalMid_Lock);
 250                 }
 251         }
 252         spin_unlock(&cifs_tcp_ses_lock);
 253         seq_putc(m, '\n');
 254
 255         /* BB add code to dump additional info such as TCP session info now */
 256         return 0;
 257 }
 258
 259 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 260 {
 261         return single_open(file, cifs_debug_data_proc_show, NULL);
 262 }
 263
 264 static const struct file_operations cifs_debug_data_proc_fops = {
 265         .owner          = THIS_MODULE,
 266         .open           = cifs_debug_data_proc_open,
 267         .read           = seq_read,
 268         .llseek         = seq_lseek,
 269         .release        = single_release,
 270 };
 271
 272 #ifdef CONFIG_CIFS_STATS
 273 static ssize_t cifs_stats_proc_write(struct file *file,
 274                 const char __user *buffer, size_t count, loff_t *ppos)
 275 {
 276         char c;
 277         bool bv;
 278         int rc;
 279         struct list_head *tmp1, *tmp2, *tmp3;
 280         struct TCP_Server_Info *server;
 281         struct cifs_ses *ses;
 282         struct cifs_tcon *tcon;
 283
 284         rc = get_user(c, buffer);
 285         if (rc)
 286                 return rc;
 287
 288         if (strtobool(&c, &bv) == 0) {
 289 #ifdef CONFIG_CIFS_STATS2
 290                 atomic_set(&totBufAllocCount, 0);
 291                 atomic_set(&totSmBufAllocCount, 0);
 292 #endif /* CONFIG_CIFS_STATS2 */
 293                 spin_lock(&cifs_tcp_ses_lock);
 294                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 295                         server = list_entry(tmp1, struct TCP_Server_Info,
 296                                             tcp_ses_list);
 297                         list_for_each(tmp2, &server->smb_ses_list) {
 298                                 ses = list_entry(tmp2, struct cifs_ses,
 299                                                  smb_ses_list);
 300                                 list_for_each(tmp3, &ses->tcon_list) {
 301                                         tcon = list_entry(tmp3,
 302                                                           struct cifs_tcon,
 303                                                           tcon_list);
 304                                         atomic_set(&tcon->num_smbs_sent, 0);
 305                                         if (server->ops->clear_stats)
 306                                                 server->ops->clear_stats(tcon);
 307                                 }
 308                         }
 309                 }
 310                 spin_unlock(&cifs_tcp_ses_lock);
 311         }
 312
 313         return count;
 314 }
 315
 316 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 317 {
 318         int i;
 319         struct list_head *tmp1, *tmp2, *tmp3;
 320         struct TCP_Server_Info *server;
 321         struct cifs_ses *ses;
 322         struct cifs_tcon *tcon;
 323
 324         seq_printf(m,
 325                         "Resources in use\nCIFS Session: %d\n",
 326                         sesInfoAllocCount.counter);
 327         seq_printf(m, "Share (unique mount targets): %d\n",
 328                         tconInfoAllocCount.counter);
 329         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 330                         bufAllocCount.counter,
 331                         cifs_min_rcv + tcpSesAllocCount.counter);
 332         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 333                         smBufAllocCount.counter, cifs_min_small);
 334 #ifdef CONFIG_CIFS_STATS2
 335         seq_printf(m, "Total Large %d Small %d Allocations\n",
 336                                 atomic_read(&totBufAllocCount),
 337                                 atomic_read(&totSmBufAllocCount));
 338 #endif /* CONFIG_CIFS_STATS2 */
 339
 340         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 341         seq_printf(m,
 342                 "\n%d session %d share reconnects\n",
 343                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 344
 345         seq_printf(m,
 346                 "Total vfs operations: %d maximum at one time: %d\n",
 347                 GlobalCurrentXid, GlobalMaxActiveXid);
 348
 349         i = 0;
 350         spin_lock(&cifs_tcp_ses_lock);
 351         list_for_each(tmp1, &cifs_tcp_ses_list) {
 352                 server = list_entry(tmp1, struct TCP_Server_Info,
 353                                     tcp_ses_list);
 354                 list_for_each(tmp2, &server->smb_ses_list) {
 355                         ses = list_entry(tmp2, struct cifs_ses,
 356                                          smb_ses_list);
 357                         list_for_each(tmp3, &ses->tcon_list) {
 358                                 tcon = list_entry(tmp3,
 359                                                   struct cifs_tcon,
 360                                                   tcon_list);
 361                                 i++;
 362                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 363                                 if (tcon->need_reconnect)
 364                                         seq_puts(m, "\tDISCONNECTED ");
 365                                 seq_printf(m, "\nSMBs: %d",
 366                                            atomic_read(&tcon->num_smbs_sent));
 367                                 if (server->ops->print_stats)
 368                                         server->ops->print_stats(m, tcon);
 369                         }
 370                 }
 371         }
 372         spin_unlock(&cifs_tcp_ses_lock);
 373
 374         seq_putc(m, '\n');
 375         return 0;
 376 }
 377
 378 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 379 {
 380         return single_open(file, cifs_stats_proc_show, NULL);
 381 }
 382
 383 static const struct file_operations cifs_stats_proc_fops = {
 384         .owner          = THIS_MODULE,
 385         .open           = cifs_stats_proc_open,
 386         .read           = seq_read,
 387         .llseek         = seq_lseek,
 388         .release        = single_release,
 389         .write          = cifs_stats_proc_write,
 390 };
 391 #endif /* STATS */
 392
 393 static struct proc_dir_entry *proc_fs_cifs;
 394 static const struct file_operations cifsFYI_proc_fops;
 395 static const struct file_operations cifs_lookup_cache_proc_fops;
 396 static const struct file_operations traceSMB_proc_fops;
 397 static const struct file_operations cifs_security_flags_proc_fops;
 398 static const struct file_operations cifs_linux_ext_proc_fops;
 399
 400 void
 401 cifs_proc_init(void)
 402 {
 403         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 404         if (proc_fs_cifs == NULL)
 405                 return;
 406
 407         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 408
 409 #ifdef CONFIG_CIFS_STATS
 410         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 411 #endif /* STATS */
 412         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 413         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 414         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 415                     &cifs_linux_ext_proc_fops);
 416         proc_create("SecurityFlags", 0, proc_fs_cifs,
 417                     &cifs_security_flags_proc_fops);
 418         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 419                     &cifs_lookup_cache_proc_fops);
 420 }
 421
 422 void
 423 cifs_proc_clean(void)
 424 {
 425         if (proc_fs_cifs == NULL)
 426                 return;
 427
 428         remove_proc_entry("DebugData", proc_fs_cifs);
 429         remove_proc_entry("cifsFYI", proc_fs_cifs);
 430         remove_proc_entry("traceSMB", proc_fs_cifs);
 431 #ifdef CONFIG_CIFS_STATS
 432         remove_proc_entry("Stats", proc_fs_cifs);
 433 #endif
 434         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 435         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 436         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 437         remove_proc_entry("fs/cifs", NULL);
 438 }
 439
 440 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 441 {
 442         seq_printf(m, "%d\n", cifsFYI);
 443         return 0;
 444 }
 445
 446 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 447 {
 448         return single_open(file, cifsFYI_proc_show, NULL);
 449 }
 450
 451 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 452                 size_t count, loff_t *ppos)
 453 {
 454         char c;
 455         bool bv;
 456         int rc;
 457
 458         rc = get_user(c, buffer);
 459         if (rc)
 460                 return rc;
 461         if (strtobool(&c, &bv) == 0)
 462                 cifsFYI = bv;
 463         else if ((c > '1') && (c <= '9'))
 464                 cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
 465
 466         return count;
 467 }
 468
 469 static const struct file_operations cifsFYI_proc_fops = {
 470         .owner          = THIS_MODULE,
 471         .open           = cifsFYI_proc_open,
 472         .read           = seq_read,
 473         .llseek         = seq_lseek,
 474         .release        = single_release,
 475         .write          = cifsFYI_proc_write,
 476 };
 477
 478 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 479 {
 480         seq_printf(m, "%d\n", linuxExtEnabled);
 481         return 0;
 482 }
 483
 484 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 485 {
 486         return single_open(file, cifs_linux_ext_proc_show, NULL);
 487 }
 488
 489 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 490                 const char __user *buffer, size_t count, loff_t *ppos)
 491 {
 492         char c;
 493         bool bv;
 494         int rc;
 495
 496         rc = get_user(c, buffer);
 497         if (rc)
 498                 return rc;
 499
 500         rc = strtobool(&c, &bv);
 501         if (rc)
 502                 return rc;
 503
 504         linuxExtEnabled = bv;
 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         char c;
 533         bool bv;
 534         int rc;
 535
 536         rc = get_user(c, buffer);
 537         if (rc)
 538                 return rc;
 539
 540         rc = strtobool(&c, &bv);
 541         if (rc)
 542                 return rc;
 543
 544         lookupCacheEnabled = bv;
 545
 546         return count;
 547 }
 548
 549 static const struct file_operations cifs_lookup_cache_proc_fops = {
 550         .owner          = THIS_MODULE,
 551         .open           = cifs_lookup_cache_proc_open,
 552         .read           = seq_read,
 553         .llseek         = seq_lseek,
 554         .release        = single_release,
 555         .write          = cifs_lookup_cache_proc_write,
 556 };
 557
 558 static int traceSMB_proc_show(struct seq_file *m, void *v)
 559 {
 560         seq_printf(m, "%d\n", traceSMB);
 561         return 0;
 562 }
 563
 564 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 565 {
 566         return single_open(file, traceSMB_proc_show, NULL);
 567 }
 568
 569 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 570                 size_t count, loff_t *ppos)
 571 {
 572         char c;
 573         bool bv;
 574         int rc;
 575
 576         rc = get_user(c, buffer);
 577         if (rc)
 578                 return rc;
 579
 580         rc = strtobool(&c, &bv);
 581         if (rc)
 582                 return rc;
 583
 584         traceSMB = bv;
 585
 586         return count;
 587 }
 588
 589 static const struct file_operations traceSMB_proc_fops = {
 590         .owner          = THIS_MODULE,
 591         .open           = traceSMB_proc_open,
 592         .read           = seq_read,
 593         .llseek         = seq_lseek,
 594         .release        = single_release,
 595         .write          = traceSMB_proc_write,
 596 };
 597
 598 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 599 {
 600         seq_printf(m, "0x%x\n", global_secflags);
 601         return 0;
 602 }
 603
 604 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 605 {
 606         return single_open(file, cifs_security_flags_proc_show, NULL);
 607 }
 608
 609 /*
 610  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 611  * flags except for the ones corresponding to the given MUST flag. If there are
 612  * multiple MUST flags, then try to prefer more secure ones.
 613  */
 614 static void
 615 cifs_security_flags_handle_must_flags(unsigned int *flags)
 616 {
 617         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 618
 619         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 620                 *flags = CIFSSEC_MUST_KRB5;
 621         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 622                 *flags = CIFSSEC_MUST_NTLMSSP;
 623         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 624                 *flags = CIFSSEC_MUST_NTLMV2;
 625         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 626                 *flags = CIFSSEC_MUST_NTLM;
 627         else if ((*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 628                 *flags = CIFSSEC_MUST_LANMAN;
 629         else if ((*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 630                 *flags = CIFSSEC_MUST_PLNTXT;
 631
 632         *flags |= signflags;
 633 }
 634
 635 static ssize_t cifs_security_flags_proc_write(struct file *file,
 636                 const char __user *buffer, size_t count, loff_t *ppos)
 637 {
 638         int rc;
 639         unsigned int flags;
 640         char flags_string[12];
 641         char c;
 642         bool bv;
 643
 644         if ((count < 1) || (count > 11))
 645                 return -EINVAL;
 646
 647         memset(flags_string, 0, 12);
 648
 649         if (copy_from_user(flags_string, buffer, count))
 650                 return -EFAULT;
 651
 652         if (count < 3) {
 653                 /* single char or single char followed by null */
 654                 c = flags_string[0];
 655                 if (strtobool(&c, &bv) == 0) {
 656                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 657                         return count;
 658                 } else if (!isdigit(c)) {
 659                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 660                                         flags_string);
 661                         return -EINVAL;
 662                 }
 663         }
 664
 665         /* else we have a number */
 666         rc = kstrtouint(flags_string, 0, &flags);
 667         if (rc) {
 668                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 669                                 flags_string);
 670                 return rc;
 671         }
 672
 673         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 674
 675         if (flags == 0)  {
 676                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 677                 return -EINVAL;
 678         }
 679
 680         if (flags & ~CIFSSEC_MASK) {
 681                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 682                          flags & ~CIFSSEC_MASK);
 683                 return -EINVAL;
 684         }
 685
 686         cifs_security_flags_handle_must_flags(&flags);
 687
 688         /* flags look ok - update the global security flags for cifs module */
 689         global_secflags = flags;
 690         if (global_secflags & CIFSSEC_MUST_SIGN) {
 691                 /* requiring signing implies signing is allowed */
 692                 global_secflags |= CIFSSEC_MAY_SIGN;
 693                 cifs_dbg(FYI, "packet signing now required\n");
 694         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 695                 cifs_dbg(FYI, "packet signing disabled\n");
 696         }
 697         /* BB should we turn on MAY flags for other MUST options? */
 698         return count;
 699 }
 700
 701 static const struct file_operations cifs_security_flags_proc_fops = {
 702         .owner          = THIS_MODULE,
 703         .open           = cifs_security_flags_proc_open,
 704         .read           = seq_read,
 705         .llseek         = seq_lseek,
 706         .release        = single_release,
 707         .write          = cifs_security_flags_proc_write,
 708 };
 709 #else
 710 inline void cifs_proc_init(void)
 711 {
 712 }
 713
 714 inline void cifs_proc_clean(void)
 715 {
 716 }
 717 #endif /* PROC_FS */