aboutsummaryrefslogtreecommitdiff
path: root/fs/ncpfs/ioctl.c
blob: 84a8cfc4e38ec533ecaf7b7ad2812fc306a18c3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
/*
 *  ioctl.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *  Modified 1998, 1999 Wolfram Pienkoss for NLS
 *
 */

#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/highuid.h>
#include <linux/smp_lock.h>
#include <linux/vmalloc.h>
#include <linux/sched.h>

#include <linux/ncp_fs.h>

#include <asm/uaccess.h>

#include "ncplib_kernel.h"

/* maximum limit for ncp_objectname_ioctl */
#define NCP_OBJECT_NAME_MAX_LEN	4096
/* maximum limit for ncp_privatedata_ioctl */
#define NCP_PRIVATE_DATA_MAX_LEN 8192
/* maximum negotiable packet size */
#define NCP_PACKET_SIZE_INTERNAL 65536

static int
ncp_get_fs_info(struct ncp_server * server, struct file *file,
		struct ncp_fs_info __user *arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct ncp_fs_info info;

	if (file_permission(file, MAY_WRITE) != 0
	    && current_uid() != server->m.mounted_uid)
		return -EACCES;

	if (copy_from_user(&info, arg, sizeof(info)))
		return -EFAULT;

	if (info.version != NCP_GET_FS_INFO_VERSION) {
		DPRINTK("info.version invalid: %d\n", info.version);
		return -EINVAL;
	}
	/* TODO: info.addr = server->m.serv_addr; */
	SET_UID(info.mounted_uid, server->m.mounted_uid);
	info.connection		= server->connection;
	info.buffer_size	= server->buffer_size;
	info.volume_number	= NCP_FINFO(inode)->volNumber;
	info.directory_id	= NCP_FINFO(inode)->DosDirNum;

	if (copy_to_user(arg, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

static int
ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
		   struct ncp_fs_info_v2 __user * arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct ncp_fs_info_v2 info2;

	if (file_permission(file, MAY_WRITE) != 0
	    && current_uid() != server->m.mounted_uid)
		return -EACCES;

	if (copy_from_user(&info2, arg, sizeof(info2)))
		return -EFAULT;

	if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
		DPRINTK("info.version invalid: %d\n", info2.version);
		return -EINVAL;
	}
	info2.mounted_uid   = server->m.mounted_uid;
	info2.connection    = server->connection;
	info2.buffer_size   = server->buffer_size;
	info2.volume_number = NCP_FINFO(inode)->volNumber;
	info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
	info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;

	if (copy_to_user(arg, &info2, sizeof(info2)))
		return -EFAULT;
	return 0;
}

#ifdef CONFIG_COMPAT
struct compat_ncp_objectname_ioctl
{
	s32		auth_type;
	u32		object_name_len;
	compat_caddr_t	object_name;	/* a userspace data, in most cases user name */
};

struct compat_ncp_fs_info_v2 {
	s32 version;
	u32 mounted_uid;
	u32 connection;
	u32 buffer_size;

	u32 volume_number;
	u32 directory_id;

	u32 dummy1;
	u32 dummy2;
	u32 dummy3;
};

struct compat_ncp_ioctl_request {
	u32 function;
	u32 size;
	compat_caddr_t data;
};

struct compat_ncp_privatedata_ioctl
{
	u32		len;
	compat_caddr_t	data;		/* ~1000 for NDS */
};

#define NCP_IOC_GET_FS_INFO_V2_32	_IOWR('n', 4, struct compat_ncp_fs_info_v2)
#define NCP_IOC_NCPREQUEST_32		_IOR('n', 1, struct compat_ncp_ioctl_request)
#define NCP_IOC_GETOBJECTNAME_32	_IOWR('n', 9, struct compat_ncp_objectname_ioctl)
#define NCP_IOC_SETOBJECTNAME_32	_IOR('n', 9, struct compat_ncp_objectname_ioctl)
#define NCP_IOC_GETPRIVATEDATA_32	_IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
#define NCP_IOC_SETPRIVATEDATA_32	_IOR('n', 10, struct compat_ncp_privatedata_ioctl)

static int
ncp_get_compat_fs_info_v2(struct ncp_server * server, struct file *file,
		   struct compat_ncp_fs_info_v2 __user * arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct compat_ncp_fs_info_v2 info2;

	if (file_permission(file, MAY_WRITE) != 0
	    && current_uid() != server->m.mounted_uid)
		return -EACCES;

	if (copy_from_user(&info2, arg, sizeof(info2)))
		return -EFAULT;

	if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
		DPRINTK("info.version invalid: %d\n", info2.version);
		return -EINVAL;
	}
	info2.mounted_uid   = server->m.mounted_uid;
	info2.connection    = server->connection;
	info2.buffer_size   = server->buffer_size;
	info2.volume_number = NCP_FINFO(inode)->volNumber;
	info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
	info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;

	if (copy_to_user(arg, &info2, sizeof(info2)))
		return -EFAULT;
	return 0;
}
#endif

#define NCP_IOC_GETMOUNTUID16		_IOW('n', 2, u16)
#define NCP_IOC_GETMOUNTUID32		_IOW('n', 2, u32)
#define NCP_IOC_GETMOUNTUID64		_IOW('n', 2, u64)

#ifdef CONFIG_NCPFS_NLS
/* Here we are select the iocharset and the codepage for NLS.
 * Thanks Petr Vandrovec for idea and many hints.
 */
static int
ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
	struct ncp_nls_ioctl user;
	struct nls_table *codepage;
	struct nls_table *iocharset;
	struct nls_table *oldset_io;
	struct nls_table *oldset_cp;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (server->root_setuped)
		return -EBUSY;

	if (copy_from_user(&user, arg, sizeof(user)))
		return -EFAULT;

	codepage = NULL;
	user.codepage[NCP_IOCSNAME_LEN] = 0;
	if (!user.codepage[0] || !strcmp(user.codepage, "default"))
		codepage = load_nls_default();
	else {
		codepage = load_nls(user.codepage);
		if (!codepage) {
			return -EBADRQC;
		}
	}

	iocharset = NULL;
	user.iocharset[NCP_IOCSNAME_LEN] = 0;
	if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
		iocharset = load_nls_default();
		NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
	} else if (!strcmp(user.iocharset, "utf8")) {
		iocharset = load_nls_default();
		NCP_SET_FLAG(server, NCP_FLAG_UTF8);
	} else {
		iocharset = load_nls(user.iocharset);
		if (!iocharset) {
			unload_nls(codepage);
			return -EBADRQC;
		}
		NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
	}

	oldset_cp = server->nls_vol;
	server->nls_vol = codepage;
	oldset_io = server->nls_io;
	server->nls_io = iocharset;

	unload_nls(oldset_cp);
	unload_nls(oldset_io);

	return 0;
}

static int
ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
	struct ncp_nls_ioctl user;
	int len;

	memset(&user, 0, sizeof(user));
	if (server->nls_vol && server->nls_vol->charset) {
		len = strlen(server->nls_vol->charset);
		if (len > NCP_IOCSNAME_LEN)
			len = NCP_IOCSNAME_LEN;
		strncpy(user.codepage, server->nls_vol->charset, len);
		user.codepage[len] = 0;
	}

	if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
		strcpy(user.iocharset, "utf8");
	else if (server->nls_io && server->nls_io->charset) {
		len = strlen(server->nls_io->charset);
		if (len > NCP_IOCSNAME_LEN)
			len = NCP_IOCSNAME_LEN;
		strncpy(user.iocharset,	server->nls_io->charset, len);
		user.iocharset[len] = 0;
	}

	if (copy_to_user(arg, &user, sizeof(user)))
		return -EFAULT;
	return 0;
}
#endif /* CONFIG_NCPFS_NLS */

static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_dentry->d_inode;
	struct ncp_server *server = NCP_SERVER(inode);
	int result;
	struct ncp_ioctl_request request;
	char* bouncebuffer;
	void __user *argp = (void __user *)arg;
	uid_t uid = current_uid();

	switch (cmd) {
#ifdef CONFIG_COMPAT
	case NCP_IOC_NCPREQUEST_32:
#endif
	case NCP_IOC_NCPREQUEST:
		if (file_permission(filp, MAY_WRITE) != 0
		    && uid != server->m.mounted_uid)
			return -EACCES;

#ifdef CONFIG_COMPAT
		if (cmd == NCP_IOC_NCPREQUEST_32) {
			struct compat_ncp_ioctl_request request32;
			if (copy_from_user(&request32, argp, sizeof(request32)))
				return -EFAULT;
			request.function = request32.function;
			request.size = request32.size;
			request.data = compat_ptr(request32.data);
		} else
#endif
		if (copy_from_user(&request, argp, sizeof(request)))
			return -EFAULT;

		if ((request.function > 255)
		    || (request.size >
		  NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
			return -EINVAL;
		}
		bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
		if (!bouncebuffer)
			return -ENOMEM;
		if (copy_from_user(bouncebuffer, request.data, request.size)) {
			vfree(bouncebuffer);
			return -EFAULT;
		}
		ncp_lock_server(server);

		/* FIXME: We hack around in the server's structures
		   here to be able to use ncp_request */

		server->has_subfunction = 0;
		server->current_size = request.size;
		memcpy(server->packet, bouncebuffer, request.size);

		result = ncp_request2(server, request.function, 
			bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
		if (result < 0)
			result = -EIO;
		else
			result = server->reply_size;
		ncp_unlock_server(server);
		DPRINTK("ncp_ioctl: copy %d bytes\n",
			result);
		if (result >= 0)
			if (copy_to_user(request.data, bouncebuffer, result))
				result = -EFAULT;
		vfree(bouncebuffer);
		return result;

	case NCP_IOC_CONN_LOGGED_IN:

		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
			return -EINVAL;
		if (server->root_setuped)
			return -EBUSY;
		server->root_setuped = 1;
		return ncp_conn_logged_in(inode->i_sb);

	case NCP_IOC_GET_FS_INFO:
		return ncp_get_fs_info(server, filp, argp);

	case NCP_IOC_GET_FS_INFO_V2:
		return ncp_get_fs_info_v2(server, filp, argp);

#ifdef CONFIG_COMPAT
	case NCP_IOC_GET_FS_INFO_V2_32:
		return ncp_get_compat_fs_info_v2(server, filp, argp);
#endif
	/* we have too many combinations of CONFIG_COMPAT,
	 * CONFIG_64BIT and CONFIG_UID16, so just handle
	 * any of the possible ioctls */
	case NCP_IOC_GETMOUNTUID16:
	case NCP_IOC_GETMOUNTUID32:
	case NCP_IOC_GETMOUNTUID64:
		if (file_permission(filp, MAY_READ) != 0
			&& uid != server->m.mounted_uid)
			return -EACCES;

		if (cmd == NCP_IOC_GETMOUNTUID16) {
			u16 uid;
			SET_UID(uid, server->m.mounted_uid);
			if (put_user(uid, (u16 __user *)argp))
				return -EFAULT;
		} else if (cmd == NCP_IOC_GETMOUNTUID32) {
			if (put_user(server->m.mounted_uid,
						(u32 __user *)argp))
				return -EFAULT;
		} else {
			if (put_user(server->m.mounted_uid,
						(u64 __user *)argp))
				return -EFAULT;
		}
		return 0;

	case NCP_IOC_GETROOT:
		{
			struct ncp_setroot_ioctl sr;

			if (file_permission(filp, MAY_READ) != 0
			    && uid != server->m.mounted_uid)
				return -EACCES;

			if (server->m.mounted_vol[0]) {
				struct dentry* dentry = inode->i_sb->s_root;

				if (dentry) {
					struct inode* s_inode = dentry->d_inode;
				
					if (s_inode) {
						sr.volNumber = NCP_FINFO(s_inode)->volNumber;
						sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
						sr.namespace = server->name_space[sr.volNumber];
					} else
						DPRINTK("ncpfs: s_root->d_inode==NULL\n");
				} else
					DPRINTK("ncpfs: s_root==NULL\n");
			} else {
				sr.volNumber = -1;
				sr.namespace = 0;
				sr.dirEntNum = 0;
			}
			if (copy_to_user(argp, &sr, sizeof(sr)))
				return -EFAULT;
			return 0;
		}

	case NCP_IOC_SETROOT:
		{
			struct ncp_setroot_ioctl sr;
			__u32 vnum;
			__le32 de;
			__le32 dosde;
			struct dentry* dentry;

			if (!capable(CAP_SYS_ADMIN))
			{
				return -EACCES;
			}
			if (server->root_setuped) return -EBUSY;
			if (copy_from_user(&sr, argp, sizeof(sr)))
				return -EFAULT;
			if (sr.volNumber < 0) {
				server->m.mounted_vol[0] = 0;
				vnum = NCP_NUMBER_OF_VOLUMES;
				de = 0;
				dosde = 0;
			} else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
				return -EINVAL;
			} else if (ncp_mount_subdir(server, sr.volNumber,
						sr.namespace, sr.dirEntNum,
						&vnum, &de, &dosde)) {
				return -ENOENT;
			}
			
			dentry = inode->i_sb->s_root;
			server->root_setuped = 1;
			if (dentry) {
				struct inode* s_inode = dentry->d_inode;
				
				if (s_inode) {
					NCP_FINFO(s_inode)->volNumber = vnum;
					NCP_FINFO(s_inode)->dirEntNum = de;
					NCP_FINFO(s_inode)->DosDirNum = dosde;
				} else
					DPRINTK("ncpfs: s_root->d_inode==NULL\n");
			} else
				DPRINTK("ncpfs: s_root==NULL\n");

			return 0;
		}

#ifdef CONFIG_NCPFS_PACKET_SIGNING	
	case NCP_IOC_SIGN_INIT:
		if (file_permission(filp, MAY_WRITE) != 0
		    && uid != server->m.mounted_uid)
			return -EACCES;

		if (argp) {
			if (server->sign_wanted)
			{
				struct ncp_sign_init sign;

				if (copy_from_user(&sign, argp, sizeof(sign)))
					return -EFAULT;
				memcpy(server->sign_root,sign.sign_root,8);
				memcpy(server->sign_last,sign.sign_last,16);
				server->sign_active = 1;
			}
			/* ignore when signatures not wanted */
		} else {
			server->sign_active = 0;
		}
		return 0;		
		
        case NCP_IOC_SIGN_WANTED:
		if (file_permission(filp, MAY_READ) != 0
		    && uid != server->m.mounted_uid)
			return -EACCES;
		
                if (put_user(server->sign_wanted, (int __user *)argp))
			return -EFAULT;
                return 0;

	case NCP_IOC_SET_SIGN_WANTED:
		{
			int newstate;

			if (file_permission(filp, MAY_WRITE) != 0
			    && uid != server->m.mounted_uid)
				return -EACCES;

			/* get only low 8 bits... */
			if (get_user(newstate, (unsigned char __user *)argp))
				return -EFAULT;
			if (server->sign_active) {
				/* cannot turn signatures OFF when active */
				if (!newstate) return -EINVAL;
			} else {
				server->sign_wanted = newstate != 0;
			}
			return 0;
		}

#endif /* CONFIG_NCPFS_PACKET_SIGNING */

#ifdef CONFIG_NCPFS_IOCTL_LOCKING
	case NCP_IOC_LOCKUNLOCK:
		if (file_permission(filp, MAY_WRITE) != 0
		    && uid != server->m.mounted_uid)
			return -EACCES;

		{
			struct ncp_lock_ioctl	 rqdata;

			if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
				return -EFAULT;
			if (rqdata.origin != 0)
				return -EINVAL;
			/* check for cmd */
			switch (rqdata.cmd) {
				case NCP_LOCK_EX:
				case NCP_LOCK_SH:
						if (rqdata.timeout == 0)
							rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
						else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
							rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
						break;
				case NCP_LOCK_LOG:
						rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;	/* has no effect */
				case NCP_LOCK_CLEAR:
						break;
				default:
						return -EINVAL;
			}
			/* locking needs both read and write access */
			if ((result = ncp_make_open(inode, O_RDWR)) != 0)
			{
				return result;
			}
			result = -EIO;
			if (!ncp_conn_valid(server))
				goto outrel;
			result = -EISDIR;
			if (!S_ISREG(inode->i_mode))
				goto outrel;
			if (rqdata.cmd == NCP_LOCK_CLEAR)
			{
				result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
							NCP_FINFO(inode)->file_handle, 
							rqdata.offset,
							rqdata.length);
				if (result > 0) result = 0;	/* no such lock */
			}
			else
			{
				int lockcmd;

				switch (rqdata.cmd)
				{
					case NCP_LOCK_EX:  lockcmd=1; break;
					case NCP_LOCK_SH:  lockcmd=3; break;
					default:	   lockcmd=0; break;
				}
				result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
							NCP_FINFO(inode)->file_handle,
							lockcmd,
							rqdata.offset,
							rqdata.length,
							rqdata.timeout);
				if (result > 0) result = -EAGAIN;
			}
outrel:			
			ncp_inode_close(inode);
			return result;
		}
#endif	/* CONFIG_NCPFS_IOCTL_LOCKING */

#ifdef CONFIG_COMPAT
	case NCP_IOC_GETOBJECTNAME_32:
		if (uid != server->m.mounted_uid)
			return -EACCES;
		{
			struct compat_ncp_objectname_ioctl user;
			size_t outl;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			user.auth_type = server->auth.auth_type;
			outl = user.object_name_len;
			user.object_name_len = server->auth.object_name_len;
			if (outl > user.object_name_len)
				outl = user.object_name_len;
			if (outl) {
				if (copy_to_user(compat_ptr(user.object_name),
						 server->auth.object_name,
						 outl)) return -EFAULT;
			}
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}
#endif

	case NCP_IOC_GETOBJECTNAME:
		if (uid != server->m.mounted_uid)
			return -EACCES;
		{
			struct ncp_objectname_ioctl user;
			size_t outl;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			user.auth_type = server->auth.auth_type;
			outl = user.object_name_len;
			user.object_name_len = server->auth.object_name_len;
			if (outl > user.object_name_len)
				outl = user.object_name_len;
			if (outl) {
				if (copy_to_user(user.object_name,
						 server->auth.object_name,
						 outl)) return -EFAULT;
			}
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}

#ifdef CONFIG_COMPAT
	case NCP_IOC_SETOBJECTNAME_32:
#endif
	case NCP_IOC_SETOBJECTNAME:
		if (uid != server->m.mounted_uid)
			return -EACCES;
		{
			struct ncp_objectname_ioctl user;
			void* newname;
			void* oldname;
			size_t oldnamelen;
			void* oldprivate;
			size_t oldprivatelen;

#ifdef CONFIG_COMPAT
			if (cmd == NCP_IOC_SETOBJECTNAME_32) {
				struct compat_ncp_objectname_ioctl user32;
				if (copy_from_user(&user32, argp, sizeof(user32)))
					return -EFAULT;
				user.auth_type = user32.auth_type;
				user.object_name_len = user32.object_name_len;
				user.object_name = compat_ptr(user32.object_name);
			} else
#endif
			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;

			if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
				return -ENOMEM;
			if (user.object_name_len) {
				newname = memdup_user(user.object_name,
						      user.object_name_len);
				if (IS_ERR(newname))
					return PTR_ERR(newname);
			} else {
				newname = NULL;
			}
			/* enter critical section */
			/* maybe that kfree can sleep so do that this way */
			/* it is at least more SMP friendly (in future...) */
			oldname = server->auth.object_name;
			oldnamelen = server->auth.object_name_len;
			oldprivate = server->priv.data;
			oldprivatelen = server->priv.len;
			server->auth.auth_type = user.auth_type;
			server->auth.object_name_len = user.object_name_len;
			server->auth.object_name = newname;
			server->priv.len = 0;
			server->priv.data = NULL;
			/* leave critical section */
			kfree(oldprivate);
			kfree(oldname);
			return 0;
		}

#ifdef CONFIG_COMPAT
	case NCP_IOC_GETPRIVATEDATA_32:
#endif
	case NCP_IOC_GETPRIVATEDATA:
		if (uid != server->m.mounted_uid)
			return -EACCES;
		{
			struct ncp_privatedata_ioctl user;
			size_t outl;

#ifdef CONFIG_COMPAT
			if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
				struct compat_ncp_privatedata_ioctl user32;
				if (copy_from_user(&user32, argp, sizeof(user32)))
					return -EFAULT;
				user.len = user32.len;
				user.data = compat_ptr(user32.data);
			} else
#endif
			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;

			outl = user.len;
			user.len = server->priv.len;
			if (outl > user.len) outl = user.len;
			if (outl) {
				if (copy_to_user(user.data,
						 server->priv.data,
						 outl)) return -EFAULT;
			}
#ifdef CONFIG_COMPAT
			if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
				struct compat_ncp_privatedata_ioctl user32;
				user32.len = user.len;
				user32.data = (unsigned long) user.data;
				if (copy_to_user(argp, &user32, sizeof(user32)))
					return -EFAULT;
			} else
#endif
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;

			return 0;
		}

#ifdef CONFIG_COMPAT
	case NCP_IOC_SETPRIVATEDATA_32:
#endif
	case NCP_IOC_SETPRIVATEDATA:
		if (uid != server->m.mounted_uid)
			return -EACCES;
		{
			struct ncp_privatedata_ioctl user;
			void* new;
			void* old;
			size_t oldlen;

#ifdef CONFIG_COMPAT
			if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
				struct compat_ncp_privatedata_ioctl user32;
				if (copy_from_user(&user32, argp, sizeof(user32)))
					return -EFAULT;
				user.len = user32.len;
				user.data = compat_ptr(user32.data);
			} else
#endif
			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;

			if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
				return -ENOMEM;
			if (user.len) {
				new = memdup_user(user.data, user.len);
				if (IS_ERR(new))
					return PTR_ERR(new);
			} else {
				new = NULL;
			}
			/* enter critical section */
			old = server->priv.data;
			oldlen = server->priv.len;
			server->priv.len = user.len;
			server->priv.data = new;
			/* leave critical section */
			kfree(old);
			return 0;
		}

#ifdef CONFIG_NCPFS_NLS
	case NCP_IOC_SETCHARSETS:
		return ncp_set_charsets(server, argp);
		
	case NCP_IOC_GETCHARSETS:
		return ncp_get_charsets(server, argp);

#endif /* CONFIG_NCPFS_NLS */

	case NCP_IOC_SETDENTRYTTL:
		if (file_permission(filp, MAY_WRITE) != 0 &&
		    uid != server->m.mounted_uid)
			return -EACCES;

		{
			u_int32_t user;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			/* 20 secs at most... */
			if (user > 20000)
				return -EINVAL;
			user = (user * HZ) / 1000;
			server->dentry_ttl = user;
			return 0;
		}
		
	case NCP_IOC_GETDENTRYTTL:
		{
			u_int32_t user = (server->dentry_ttl * 1000) / HZ;
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}

	}
	return -EINVAL;
}

static int ncp_ioctl_need_write(unsigned int cmd)
{
	switch (cmd) {
	case NCP_IOC_GET_FS_INFO:
	case NCP_IOC_GET_FS_INFO_V2:
	case NCP_IOC_NCPREQUEST:
	case NCP_IOC_SETDENTRYTTL:
	case NCP_IOC_SIGN_INIT:
	case NCP_IOC_LOCKUNLOCK:
	case NCP_IOC_SET_SIGN_WANTED:
		return 1;
	case NCP_IOC_GETOBJECTNAME:
	case NCP_IOC_SETOBJECTNAME:
	case NCP_IOC_GETPRIVATEDATA:
	case NCP_IOC_SETPRIVATEDATA:
	case NCP_IOC_SETCHARSETS:
	case NCP_IOC_GETCHARSETS:
	case NCP_IOC_CONN_LOGGED_IN:
	case NCP_IOC_GETDENTRYTTL:
	case NCP_IOC_GETMOUNTUID2:
	case NCP_IOC_SIGN_WANTED:
	case NCP_IOC_GETROOT:
	case NCP_IOC_SETROOT:
		return 0;
	default:
		/* unknown IOCTL command, assume write */
		return 1;
	}
}

long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	long ret;

	lock_kernel();
	if (ncp_ioctl_need_write(cmd)) {
		/*
		 * inside the ioctl(), any failures which
		 * are because of file_permission() are
		 * -EACCESS, so it seems consistent to keep
		 *  that here.
		 */
		if (mnt_want_write(filp->f_path.mnt)) {
			ret = -EACCES;
			goto out;
		}
	}
	ret = __ncp_ioctl(filp, cmd, arg);
	if (ncp_ioctl_need_write(cmd))
		mnt_drop_write(filp->f_path.mnt);

out:
	unlock_kernel();
	return ret;
}

#ifdef CONFIG_COMPAT
long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	long ret;

	lock_kernel();
	arg = (unsigned long) compat_ptr(arg);
	ret = ncp_ioctl(file, cmd, arg);
	unlock_kernel();
	return ret;
}
#endif