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Merge tag 'for-3.11-rc1' of git://gitorious.org/linux-pwm/linux-pwm
[linux-2.6.git] / fs / cifs / cifs_debug.c
blobf3ac4154cbb606707956d9fbbd2a64ec553a9ceb
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: 0x%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 int rc;
278 struct list_head *tmp1, *tmp2, *tmp3;
279 struct TCP_Server_Info *server;
280 struct cifs_ses *ses;
281 struct cifs_tcon *tcon;
282
283 rc = get_user(c, buffer);
284 if (rc)
285 return rc;
286
287 if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
288 #ifdef CONFIG_CIFS_STATS2
289 atomic_set(&totBufAllocCount, 0);
290 atomic_set(&totSmBufAllocCount, 0);
291 #endif /* CONFIG_CIFS_STATS2 */
292 spin_lock(&cifs_tcp_ses_lock);
293 list_for_each(tmp1, &cifs_tcp_ses_list) {
294 server = list_entry(tmp1, struct TCP_Server_Info,
295 tcp_ses_list);
296 list_for_each(tmp2, &server->smb_ses_list) {
297 ses = list_entry(tmp2, struct cifs_ses,
298 smb_ses_list);
299 list_for_each(tmp3, &ses->tcon_list) {
300 tcon = list_entry(tmp3,
301 struct cifs_tcon,
302 tcon_list);
303 atomic_set(&tcon->num_smbs_sent, 0);
304 if (server->ops->clear_stats)
305 server->ops->clear_stats(tcon);
306 }
307 }
308 }
309 spin_unlock(&cifs_tcp_ses_lock);
310 }
311
312 return count;
313 }
314
315 static int cifs_stats_proc_show(struct seq_file *m, void *v)
316 {
317 int i;
318 struct list_head *tmp1, *tmp2, *tmp3;
319 struct TCP_Server_Info *server;
320 struct cifs_ses *ses;
321 struct cifs_tcon *tcon;
322
323 seq_printf(m,
324 "Resources in use\nCIFS Session: %d\n",
325 sesInfoAllocCount.counter);
326 seq_printf(m, "Share (unique mount targets): %d\n",
327 tconInfoAllocCount.counter);
328 seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
329 bufAllocCount.counter,
330 cifs_min_rcv + tcpSesAllocCount.counter);
331 seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
332 smBufAllocCount.counter, cifs_min_small);
333 #ifdef CONFIG_CIFS_STATS2
334 seq_printf(m, "Total Large %d Small %d Allocations\n",
335 atomic_read(&totBufAllocCount),
336 atomic_read(&totSmBufAllocCount));
337 #endif /* CONFIG_CIFS_STATS2 */
338
339 seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
340 seq_printf(m,
341 "\n%d session %d share reconnects\n",
342 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
343
344 seq_printf(m,
345 "Total vfs operations: %d maximum at one time: %d\n",
346 GlobalCurrentXid, GlobalMaxActiveXid);
347
348 i = 0;
349 spin_lock(&cifs_tcp_ses_lock);
350 list_for_each(tmp1, &cifs_tcp_ses_list) {
351 server = list_entry(tmp1, struct TCP_Server_Info,
352 tcp_ses_list);
353 list_for_each(tmp2, &server->smb_ses_list) {
354 ses = list_entry(tmp2, struct cifs_ses,
355 smb_ses_list);
356 list_for_each(tmp3, &ses->tcon_list) {
357 tcon = list_entry(tmp3,
358 struct cifs_tcon,
359 tcon_list);
360 i++;
361 seq_printf(m, "\n%d) %s", i, tcon->treeName);
362 if (tcon->need_reconnect)
363 seq_puts(m, "\tDISCONNECTED ");
364 seq_printf(m, "\nSMBs: %d",
365 atomic_read(&tcon->num_smbs_sent));
366 if (server->ops->print_stats)
367 server->ops->print_stats(m, tcon);
368 }
369 }
370 }
371 spin_unlock(&cifs_tcp_ses_lock);
372
373 seq_putc(m, '\n');
374 return 0;
375 }
376
377 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
378 {
379 return single_open(file, cifs_stats_proc_show, NULL);
380 }
381
382 static const struct file_operations cifs_stats_proc_fops = {
383 .owner = THIS_MODULE,
384 .open = cifs_stats_proc_open,
385 .read = seq_read,
386 .llseek = seq_lseek,
387 .release = single_release,
388 .write = cifs_stats_proc_write,
389 };
390 #endif /* STATS */
391
392 static struct proc_dir_entry *proc_fs_cifs;
393 static const struct file_operations cifsFYI_proc_fops;
394 static const struct file_operations cifs_lookup_cache_proc_fops;
395 static const struct file_operations traceSMB_proc_fops;
396 static const struct file_operations cifs_security_flags_proc_fops;
397 static const struct file_operations cifs_linux_ext_proc_fops;
398
399 void
400 cifs_proc_init(void)
401 {
402 proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
403 if (proc_fs_cifs == NULL)
404 return;
405
406 proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
407
408 #ifdef CONFIG_CIFS_STATS
409 proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
410 #endif /* STATS */
411 proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
412 proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
413 proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
414 &cifs_linux_ext_proc_fops);
415 proc_create("SecurityFlags", 0, proc_fs_cifs,
416 &cifs_security_flags_proc_fops);
417 proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
418 &cifs_lookup_cache_proc_fops);
419 }
420
421 void
422 cifs_proc_clean(void)
423 {
424 if (proc_fs_cifs == NULL)
425 return;
426
427 remove_proc_entry("DebugData", proc_fs_cifs);
428 remove_proc_entry("cifsFYI", proc_fs_cifs);
429 remove_proc_entry("traceSMB", proc_fs_cifs);
430 #ifdef CONFIG_CIFS_STATS
431 remove_proc_entry("Stats", proc_fs_cifs);
432 #endif
433 remove_proc_entry("SecurityFlags", proc_fs_cifs);
434 remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
435 remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
436 remove_proc_entry("fs/cifs", NULL);
437 }
438
439 static int cifsFYI_proc_show(struct seq_file *m, void *v)
440 {
441 seq_printf(m, "%d\n", cifsFYI);
442 return 0;
443 }
444
445 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
446 {
447 return single_open(file, cifsFYI_proc_show, NULL);
448 }
449
450 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
451 size_t count, loff_t *ppos)
452 {
453 char c;
454 int rc;
455
456 rc = get_user(c, buffer);
457 if (rc)
458 return rc;
459 if (c == '0' || c == 'n' || c == 'N')
460 cifsFYI = 0;
461 else if (c == '1' || c == 'y' || c == 'Y')
462 cifsFYI = 1;
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 int rc;
494
495 rc = get_user(c, buffer);
496 if (rc)
497 return rc;
498 if (c == '0' || c == 'n' || c == 'N')
499 linuxExtEnabled = 0;
500 else if (c == '1' || c == 'y' || c == 'Y')
501 linuxExtEnabled = 1;
502
503 return count;
504 }
505
506 static const struct file_operations cifs_linux_ext_proc_fops = {
507 .owner = THIS_MODULE,
508 .open = cifs_linux_ext_proc_open,
509 .read = seq_read,
510 .llseek = seq_lseek,
511 .release = single_release,
512 .write = cifs_linux_ext_proc_write,
513 };
514
515 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
516 {
517 seq_printf(m, "%d\n", lookupCacheEnabled);
518 return 0;
519 }
520
521 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
522 {
523 return single_open(file, cifs_lookup_cache_proc_show, NULL);
524 }
525
526 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
527 const char __user *buffer, size_t count, loff_t *ppos)
528 {
529 char c;
530 int rc;
531
532 rc = get_user(c, buffer);
533 if (rc)
534 return rc;
535 if (c == '0' || c == 'n' || c == 'N')
536 lookupCacheEnabled = 0;
537 else if (c == '1' || c == 'y' || c == 'Y')
538 lookupCacheEnabled = 1;
539
540 return count;
541 }
542
543 static const struct file_operations cifs_lookup_cache_proc_fops = {
544 .owner = THIS_MODULE,
545 .open = cifs_lookup_cache_proc_open,
546 .read = seq_read,
547 .llseek = seq_lseek,
548 .release = single_release,
549 .write = cifs_lookup_cache_proc_write,
550 };
551
552 static int traceSMB_proc_show(struct seq_file *m, void *v)
553 {
554 seq_printf(m, "%d\n", traceSMB);
555 return 0;
556 }
557
558 static int traceSMB_proc_open(struct inode *inode, struct file *file)
559 {
560 return single_open(file, traceSMB_proc_show, NULL);
561 }
562
563 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
564 size_t count, loff_t *ppos)
565 {
566 char c;
567 int rc;
568
569 rc = get_user(c, buffer);
570 if (rc)
571 return rc;
572 if (c == '0' || c == 'n' || c == 'N')
573 traceSMB = 0;
574 else if (c == '1' || c == 'y' || c == 'Y')
575 traceSMB = 1;
576
577 return count;
578 }
579
580 static const struct file_operations traceSMB_proc_fops = {
581 .owner = THIS_MODULE,
582 .open = traceSMB_proc_open,
583 .read = seq_read,
584 .llseek = seq_lseek,
585 .release = single_release,
586 .write = traceSMB_proc_write,
587 };
588
589 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
590 {
591 seq_printf(m, "0x%x\n", global_secflags);
592 return 0;
593 }
594
595 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
596 {
597 return single_open(file, cifs_security_flags_proc_show, NULL);
598 }
599
600 /*
601 * Ensure that if someone sets a MUST flag, that we disable all other MAY
602 * flags except for the ones corresponding to the given MUST flag. If there are
603 * multiple MUST flags, then try to prefer more secure ones.
604 */
605 static void
606 cifs_security_flags_handle_must_flags(unsigned int *flags)
607 {
608 unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
609
610 if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
611 *flags = CIFSSEC_MUST_KRB5;
612 else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
613 *flags = CIFSSEC_MUST_NTLMSSP;
614 else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
615 *flags = CIFSSEC_MUST_NTLMV2;
616 else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
617 *flags = CIFSSEC_MUST_NTLM;
618 else if ((*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
619 *flags = CIFSSEC_MUST_LANMAN;
620 else if ((*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
621 *flags = CIFSSEC_MUST_PLNTXT;
622
623 *flags |= signflags;
624 }
625
626 static ssize_t cifs_security_flags_proc_write(struct file *file,
627 const char __user *buffer, size_t count, loff_t *ppos)
628 {
629 int rc;
630 unsigned int flags;
631 char flags_string[12];
632 char c;
633
634 if ((count < 1) || (count > 11))
635 return -EINVAL;
636
637 memset(flags_string, 0, 12);
638
639 if (copy_from_user(flags_string, buffer, count))
640 return -EFAULT;
641
642 if (count < 3) {
643 /* single char or single char followed by null */
644 c = flags_string[0];
645 if (c == '0' || c == 'n' || c == 'N') {
646 global_secflags = CIFSSEC_DEF; /* default */
647 return count;
648 } else if (c == '1' || c == 'y' || c == 'Y') {
649 global_secflags = CIFSSEC_MAX;
650 return count;
651 } else if (!isdigit(c)) {
652 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
653 flags_string);
654 return -EINVAL;
655 }
656 }
657
658 /* else we have a number */
659 rc = kstrtouint(flags_string, 0, &flags);
660 if (rc) {
661 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
662 flags_string);
663 return rc;
664 }
665
666 cifs_dbg(FYI, "sec flags 0x%x\n", flags);
667
668 if (flags == 0) {
669 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
670 return -EINVAL;
671 }
672
673 if (flags & ~CIFSSEC_MASK) {
674 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
675 flags & ~CIFSSEC_MASK);
676 return -EINVAL;
677 }
678
679 cifs_security_flags_handle_must_flags(&flags);
680
681 /* flags look ok - update the global security flags for cifs module */
682 global_secflags = flags;
683 if (global_secflags & CIFSSEC_MUST_SIGN) {
684 /* requiring signing implies signing is allowed */
685 global_secflags |= CIFSSEC_MAY_SIGN;
686 cifs_dbg(FYI, "packet signing now required\n");
687 } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
688 cifs_dbg(FYI, "packet signing disabled\n");
689 }
690 /* BB should we turn on MAY flags for other MUST options? */
691 return count;
692 }
693
694 static const struct file_operations cifs_security_flags_proc_fops = {
695 .owner = THIS_MODULE,
696 .open = cifs_security_flags_proc_open,
697 .read = seq_read,
698 .llseek = seq_lseek,
699 .release = single_release,
700 .write = cifs_security_flags_proc_write,
701 };
702 #else
703 inline void cifs_proc_init(void)
704 {
705 }
706
707 inline void cifs_proc_clean(void)
708 {
709 }
710 #endif /* PROC_FS */
Linus' kernel tree