summaryrefslogtreecommitdiff
path: root/security/tomoyo/common.h
blob: 139ad754446009859ec8338a2b7f1e39a80ada35 (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
/*
 * security/tomoyo/common.h
 *
 * Header file for TOMOYO.
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#ifndef _SECURITY_TOMOYO_COMMON_H
#define _SECURITY_TOMOYO_COMMON_H

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/list.h>
#include <linux/cred.h>
#include <linux/poll.h>
struct linux_binprm;

/********** Constants definitions. **********/

/*
 * TOMOYO uses this hash only when appending a string into the string
 * table. Frequency of appending strings is very low. So we don't need
 * large (e.g. 64k) hash size. 256 will be sufficient.
 */
#define TOMOYO_HASH_BITS  8
#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)

#define TOMOYO_EXEC_TMPSIZE     4096

/* Profile number is an integer between 0 and 255. */
#define TOMOYO_MAX_PROFILES 256

/* Index numbers for operation mode. */
enum tomoyo_mode_index {
	TOMOYO_CONFIG_DISABLED,
	TOMOYO_CONFIG_LEARNING,
	TOMOYO_CONFIG_PERMISSIVE,
	TOMOYO_CONFIG_ENFORCING,
	TOMOYO_CONFIG_USE_DEFAULT = 255
};

/* Index numbers for entry type. */
enum tomoyo_policy_id {
	TOMOYO_ID_GROUP,
	TOMOYO_ID_PATH_GROUP,
	TOMOYO_ID_NUMBER_GROUP,
	TOMOYO_ID_TRANSITION_CONTROL,
	TOMOYO_ID_AGGREGATOR,
	TOMOYO_ID_MANAGER,
	TOMOYO_ID_NAME,
	TOMOYO_ID_ACL,
	TOMOYO_ID_DOMAIN,
	TOMOYO_MAX_POLICY
};

/* Index numbers for group entries. */
enum tomoyo_group_id {
	TOMOYO_PATH_GROUP,
	TOMOYO_NUMBER_GROUP,
	TOMOYO_MAX_GROUP
};

/* A domain definition starts with <kernel>. */
#define TOMOYO_ROOT_NAME                         "<kernel>"
#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)

/* Index numbers for type of numeric values. */
enum tomoyo_value_type {
	TOMOYO_VALUE_TYPE_INVALID,
	TOMOYO_VALUE_TYPE_DECIMAL,
	TOMOYO_VALUE_TYPE_OCTAL,
	TOMOYO_VALUE_TYPE_HEXADECIMAL,
};

/* Index numbers for domain transition control keywords. */
enum tomoyo_transition_type {
	/* Do not change this order, */
	TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
	TOMOYO_TRANSITION_CONTROL_INITIALIZE,
	TOMOYO_TRANSITION_CONTROL_NO_KEEP,
	TOMOYO_TRANSITION_CONTROL_KEEP,
	TOMOYO_MAX_TRANSITION_TYPE
};

/* Index numbers for Access Controls. */
enum tomoyo_acl_entry_type_index {
	TOMOYO_TYPE_PATH_ACL,
	TOMOYO_TYPE_PATH2_ACL,
	TOMOYO_TYPE_PATH_NUMBER_ACL,
	TOMOYO_TYPE_MKDEV_ACL,
	TOMOYO_TYPE_MOUNT_ACL,
};

/* Index numbers for access controls with one pathname. */
enum tomoyo_path_acl_index {
	TOMOYO_TYPE_EXECUTE,
	TOMOYO_TYPE_READ,
	TOMOYO_TYPE_WRITE,
	TOMOYO_TYPE_APPEND,
	TOMOYO_TYPE_UNLINK,
	TOMOYO_TYPE_GETATTR,
	TOMOYO_TYPE_RMDIR,
	TOMOYO_TYPE_TRUNCATE,
	TOMOYO_TYPE_SYMLINK,
	TOMOYO_TYPE_CHROOT,
	TOMOYO_TYPE_UMOUNT,
	TOMOYO_MAX_PATH_OPERATION
};

enum tomoyo_mkdev_acl_index {
	TOMOYO_TYPE_MKBLOCK,
	TOMOYO_TYPE_MKCHAR,
	TOMOYO_MAX_MKDEV_OPERATION
};

/* Index numbers for access controls with two pathnames. */
enum tomoyo_path2_acl_index {
	TOMOYO_TYPE_LINK,
	TOMOYO_TYPE_RENAME,
	TOMOYO_TYPE_PIVOT_ROOT,
	TOMOYO_MAX_PATH2_OPERATION
};

/* Index numbers for access controls with one pathname and one number. */
enum tomoyo_path_number_acl_index {
	TOMOYO_TYPE_CREATE,
	TOMOYO_TYPE_MKDIR,
	TOMOYO_TYPE_MKFIFO,
	TOMOYO_TYPE_MKSOCK,
	TOMOYO_TYPE_IOCTL,
	TOMOYO_TYPE_CHMOD,
	TOMOYO_TYPE_CHOWN,
	TOMOYO_TYPE_CHGRP,
	TOMOYO_MAX_PATH_NUMBER_OPERATION
};

/* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
enum tomoyo_securityfs_interface_index {
	TOMOYO_DOMAINPOLICY,
	TOMOYO_EXCEPTIONPOLICY,
	TOMOYO_DOMAIN_STATUS,
	TOMOYO_PROCESS_STATUS,
	TOMOYO_MEMINFO,
	TOMOYO_SELFDOMAIN,
	TOMOYO_VERSION,
	TOMOYO_PROFILE,
	TOMOYO_QUERY,
	TOMOYO_MANAGER
};

/* Index numbers for special mount operations. */
enum tomoyo_special_mount {
	TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
	TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
	TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
	TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
	TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
	TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
	TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
	TOMOYO_MAX_SPECIAL_MOUNT
};

/* Index numbers for functionality. */
enum tomoyo_mac_index {
	TOMOYO_MAC_FILE_EXECUTE,
	TOMOYO_MAC_FILE_OPEN,
	TOMOYO_MAC_FILE_CREATE,
	TOMOYO_MAC_FILE_UNLINK,
	TOMOYO_MAC_FILE_GETATTR,
	TOMOYO_MAC_FILE_MKDIR,
	TOMOYO_MAC_FILE_RMDIR,
	TOMOYO_MAC_FILE_MKFIFO,
	TOMOYO_MAC_FILE_MKSOCK,
	TOMOYO_MAC_FILE_TRUNCATE,
	TOMOYO_MAC_FILE_SYMLINK,
	TOMOYO_MAC_FILE_MKBLOCK,
	TOMOYO_MAC_FILE_MKCHAR,
	TOMOYO_MAC_FILE_LINK,
	TOMOYO_MAC_FILE_RENAME,
	TOMOYO_MAC_FILE_CHMOD,
	TOMOYO_MAC_FILE_CHOWN,
	TOMOYO_MAC_FILE_CHGRP,
	TOMOYO_MAC_FILE_IOCTL,
	TOMOYO_MAC_FILE_CHROOT,
	TOMOYO_MAC_FILE_MOUNT,
	TOMOYO_MAC_FILE_UMOUNT,
	TOMOYO_MAC_FILE_PIVOT_ROOT,
	TOMOYO_MAX_MAC_INDEX
};

/* Index numbers for category of functionality. */
enum tomoyo_mac_category_index {
	TOMOYO_MAC_CATEGORY_FILE,
	TOMOYO_MAX_MAC_CATEGORY_INDEX
};

/*
 * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 * occurred in enforcing mode and the userspace daemon decided to retry.
 *
 * We must choose a positive value in order to distinguish "granted" (which is
 * 0) and "rejected" (which is a negative value) and "retry".
 */
#define TOMOYO_RETRY_REQUEST 1

/********** Structure definitions. **********/

/* Common header for holding ACL entries. */
struct tomoyo_acl_head {
	struct list_head list;
	bool is_deleted;
} __packed;

/* Common header for shared entries. */
struct tomoyo_shared_acl_head {
	struct list_head list;
	atomic_t users;
} __packed;

/* Structure for request info. */
struct tomoyo_request_info {
	struct tomoyo_domain_info *domain;
	/* For holding parameters. */
	union {
		struct {
			const struct tomoyo_path_info *filename;
			/* For using wildcards at tomoyo_find_next_domain(). */
			const struct tomoyo_path_info *matched_path;
			/* One of values in "enum tomoyo_path_acl_index". */
			u8 operation;
		} path;
		struct {
			const struct tomoyo_path_info *filename1;
			const struct tomoyo_path_info *filename2;
			/* One of values in "enum tomoyo_path2_acl_index". */
			u8 operation;
		} path2;
		struct {
			const struct tomoyo_path_info *filename;
			unsigned int mode;
			unsigned int major;
			unsigned int minor;
			/* One of values in "enum tomoyo_mkdev_acl_index". */
			u8 operation;
		} mkdev;
		struct {
			const struct tomoyo_path_info *filename;
			unsigned long number;
			/*
			 * One of values in
			 * "enum tomoyo_path_number_acl_index".
			 */
			u8 operation;
		} path_number;
		struct {
			const struct tomoyo_path_info *type;
			const struct tomoyo_path_info *dir;
			const struct tomoyo_path_info *dev;
			unsigned long flags;
			int need_dev;
		} mount;
	} param;
	u8 param_type;
	bool granted;
	u8 retry;
	u8 profile;
	u8 mode; /* One of tomoyo_mode_index . */
	u8 type;
};

/* Structure for holding a token. */
struct tomoyo_path_info {
	const char *name;
	u32 hash;          /* = full_name_hash(name, strlen(name)) */
	u16 const_len;     /* = tomoyo_const_part_length(name)     */
	bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
	bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
};

/* Structure for holding string data. */
struct tomoyo_name {
	struct tomoyo_shared_acl_head head;
	struct tomoyo_path_info entry;
};

/* Structure for holding a word. */
struct tomoyo_name_union {
	/* Either @filename or @group is NULL. */
	const struct tomoyo_path_info *filename;
	struct tomoyo_group *group;
};

/* Structure for holding a number. */
struct tomoyo_number_union {
	unsigned long values[2];
	struct tomoyo_group *group; /* Maybe NULL. */
	/* One of values in "enum tomoyo_value_type". */
	u8 value_type[2];
};

/* Structure for "path_group"/"number_group" directive. */
struct tomoyo_group {
	struct tomoyo_shared_acl_head head;
	const struct tomoyo_path_info *group_name;
	struct list_head member_list;
};

/* Structure for "path_group" directive. */
struct tomoyo_path_group {
	struct tomoyo_acl_head head;
	const struct tomoyo_path_info *member_name;
};

/* Structure for "number_group" directive. */
struct tomoyo_number_group {
	struct tomoyo_acl_head head;
	struct tomoyo_number_union number;
};

/* Common header for individual entries. */
struct tomoyo_acl_info {
	struct list_head list;
	bool is_deleted;
	u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
} __packed;

/* Structure for domain information. */
struct tomoyo_domain_info {
	struct list_head list;
	struct list_head acl_info_list;
	/* Name of this domain. Never NULL.          */
	const struct tomoyo_path_info *domainname;
	u8 profile;        /* Profile number to use. */
	bool is_deleted;   /* Delete flag.           */
	bool quota_warned; /* Quota warnning flag.   */
	bool transition_failed; /* Domain transition failed flag. */
	atomic_t users; /* Number of referring credentials. */
};

/*
 * Structure for "file execute", "file read", "file write", "file append",
 * "file unlink", "file getattr", "file rmdir", "file truncate",
 * "file symlink", "file chroot" and "file unmount" directive.
 */
struct tomoyo_path_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
	u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
	struct tomoyo_name_union name;
};

/*
 * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 */
struct tomoyo_path_number_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
	/* Bitmask of values in "enum tomoyo_path_number_acl_index". */
	u8 perm;
	struct tomoyo_name_union name;
	struct tomoyo_number_union number;
};

/* Structure for "file mkblock" and "file mkchar" directive. */
struct tomoyo_mkdev_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
	u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
	struct tomoyo_name_union name;
	struct tomoyo_number_union mode;
	struct tomoyo_number_union major;
	struct tomoyo_number_union minor;
};

/*
 * Structure for "file rename", "file link" and "file pivot_root" directive.
 */
struct tomoyo_path2_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
	u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
	struct tomoyo_name_union name1;
	struct tomoyo_name_union name2;
};

/* Structure for "file mount" directive. */
struct tomoyo_mount_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
	struct tomoyo_name_union dev_name;
	struct tomoyo_name_union dir_name;
	struct tomoyo_name_union fs_type;
	struct tomoyo_number_union flags;
};

/* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
struct tomoyo_acl_param {
	char *data;
	struct list_head *list;
	bool is_delete;
};

#define TOMOYO_MAX_IO_READ_QUEUE 64

/*
 * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 * interfaces.
 */
struct tomoyo_io_buffer {
	void (*read) (struct tomoyo_io_buffer *);
	int (*write) (struct tomoyo_io_buffer *);
	int (*poll) (struct file *file, poll_table *wait);
	/* Exclusive lock for this structure.   */
	struct mutex io_sem;
	/* Index returned by tomoyo_read_lock(). */
	int reader_idx;
	char __user *read_user_buf;
	int read_user_buf_avail;
	struct {
		struct list_head *domain;
		struct list_head *group;
		struct list_head *acl;
		int avail;
		int step;
		int query_index;
		u16 index;
		u8 bit;
		u8 w_pos;
		bool eof;
		bool print_this_domain_only;
		bool print_execute_only;
		const char *w[TOMOYO_MAX_IO_READ_QUEUE];
	} r;
	struct {
		/* The position currently writing to.   */
		struct tomoyo_domain_info *domain;
		/* Bytes available for writing.         */
		int avail;
	} w;
	/* Buffer for reading.                  */
	char *read_buf;
	/* Size of read buffer.                 */
	int readbuf_size;
	/* Buffer for writing.                  */
	char *write_buf;
	/* Size of write buffer.                */
	int writebuf_size;
	/* Type of this interface.              */
	u8 type;
};

/*
 * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 * "no_keep_domain" keyword.
 */
struct tomoyo_transition_control {
	struct tomoyo_acl_head head;
	u8 type; /* One of values in "enum tomoyo_transition_type".  */
	/* True if the domainname is tomoyo_get_last_name(). */
	bool is_last_name;
	const struct tomoyo_path_info *domainname; /* Maybe NULL */
	const struct tomoyo_path_info *program;    /* Maybe NULL */
};

/* Structure for "aggregator" keyword. */
struct tomoyo_aggregator {
	struct tomoyo_acl_head head;
	const struct tomoyo_path_info *original_name;
	const struct tomoyo_path_info *aggregated_name;
};

/* Structure for policy manager. */
struct tomoyo_manager {
	struct tomoyo_acl_head head;
	bool is_domain;  /* True if manager is a domainname. */
	/* A path to program or a domainname. */
	const struct tomoyo_path_info *manager;
};

struct tomoyo_preference {
	unsigned int learning_max_entry;
	bool enforcing_verbose;
	bool learning_verbose;
	bool permissive_verbose;
};

/* Structure for /sys/kernel/security/tomnoyo/profile interface. */
struct tomoyo_profile {
	const struct tomoyo_path_info *comment;
	struct tomoyo_preference *learning;
	struct tomoyo_preference *permissive;
	struct tomoyo_preference *enforcing;
	struct tomoyo_preference preference;
	u8 default_config;
	u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
};

/********** Function prototypes. **********/

bool tomoyo_str_starts(char **src, const char *find);
const char *tomoyo_get_exe(void);
void tomoyo_normalize_line(unsigned char *buffer);
void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
     __attribute__ ((format(printf, 2, 3)));
void tomoyo_check_profile(void);
int tomoyo_open_control(const u8 type, struct file *file);
int tomoyo_close_control(struct tomoyo_io_buffer *head);
int tomoyo_poll_control(struct file *file, poll_table *wait);
int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
			const int buffer_len);
int tomoyo_write_control(struct tomoyo_io_buffer *head,
			 const char __user *buffer, const int buffer_len);
bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
void tomoyo_warn_oom(const char *function);
const struct tomoyo_path_info *
tomoyo_compare_name_union(const struct tomoyo_path_info *name,
			  const struct tomoyo_name_union *ptr);
bool tomoyo_compare_number_union(const unsigned long value,
				 const struct tomoyo_number_union *ptr);
int tomoyo_get_mode(const u8 profile, const u8 index);
void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
	__attribute__ ((format(printf, 2, 3)));
bool tomoyo_correct_domain(const unsigned char *domainname);
bool tomoyo_correct_path(const char *filename);
bool tomoyo_correct_word(const char *string);
bool tomoyo_domain_def(const unsigned char *buffer);
bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
			     struct tomoyo_name_union *ptr);
const struct tomoyo_path_info *
tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
			  const struct tomoyo_group *group);
bool tomoyo_number_matches_group(const unsigned long min,
				 const unsigned long max,
				 const struct tomoyo_group *group);
bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
				 const struct tomoyo_path_info *pattern);
bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
			       struct tomoyo_number_union *ptr);
bool tomoyo_tokenize(char *buffer, char *w[], size_t size);
bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
int tomoyo_init_request_info(struct tomoyo_request_info *r,
			     struct tomoyo_domain_info *domain,
			     const u8 index);
int tomoyo_mount_permission(char *dev_name, struct path *path,
			    const char *type, unsigned long flags,
			    void *data_page);
int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
				    const u8 type);
int tomoyo_write_file(struct tomoyo_acl_param *param);
int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
     __attribute__ ((format(printf, 2, 3)));
struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
						const u8 profile);
struct tomoyo_profile *tomoyo_profile(const u8 profile);
struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
				      const u8 idx);
unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
				const u8 index);
void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
void tomoyo_load_policy(const char *filename);
void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
char *tomoyo_encode(const char *str);
char *tomoyo_realpath_nofollow(const char *pathname);
char *tomoyo_realpath_from_path(struct path *path);
bool tomoyo_memory_ok(void *ptr);
void *tomoyo_commit_ok(void *data, const unsigned int size);
const struct tomoyo_path_info *tomoyo_get_name(const char *name);
void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
void __init tomoyo_mm_init(void);
int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
			   const struct tomoyo_path_info *filename);
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
				 struct path *path, const int flag);
int tomoyo_path_number_perm(const u8 operation, struct path *path,
			    unsigned long number);
int tomoyo_mkdev_perm(const u8 operation, struct path *path,
		      const unsigned int mode, unsigned int dev);
int tomoyo_path_perm(const u8 operation, struct path *path);
int tomoyo_path2_perm(const u8 operation, struct path *path1,
		      struct path *path2);
int tomoyo_find_next_domain(struct linux_binprm *bprm);
void tomoyo_print_ulong(char *buffer, const int buffer_len,
			const unsigned long value, const u8 type);
void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
void tomoyo_run_gc(void);
void tomoyo_memory_free(void *ptr);
int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
			 struct tomoyo_acl_param *param,
			 bool (*check_duplicate) (const struct tomoyo_acl_info
						  *,
						  const struct tomoyo_acl_info
						  *),
			 bool (*merge_duplicate) (struct tomoyo_acl_info *,
						  struct tomoyo_acl_info *,
						  const bool));
int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
			 struct tomoyo_acl_param *param,
			 bool (*check_duplicate) (const struct tomoyo_acl_head
						  *,
						  const struct tomoyo_acl_head
						  *));
void tomoyo_check_acl(struct tomoyo_request_info *r,
		      bool (*check_entry) (struct tomoyo_request_info *,
					   const struct tomoyo_acl_info *));
char *tomoyo_read_token(struct tomoyo_acl_param *param);
bool tomoyo_permstr(const char *string, const char *keyword);

/********** External variable definitions. **********/

/* Lock for GC. */
extern struct srcu_struct tomoyo_ss;

/* The list for "struct tomoyo_domain_info". */
extern struct list_head tomoyo_domain_list;

extern struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY];
extern struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP];
extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];

/* Lock for protecting policy. */
extern struct mutex tomoyo_policy_lock;

/* Has /sbin/init started? */
extern bool tomoyo_policy_loaded;

/* The kernel's domain. */
extern struct tomoyo_domain_info tomoyo_kernel_domain;

extern const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
extern const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION];
extern const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION];
extern const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION];

extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];

extern unsigned int tomoyo_quota_for_query;
extern unsigned int tomoyo_query_memory_size;

/********** Inlined functions. **********/

/**
 * tomoyo_read_lock - Take lock for protecting policy.
 *
 * Returns index number for tomoyo_read_unlock().
 */
static inline int tomoyo_read_lock(void)
{
	return srcu_read_lock(&tomoyo_ss);
}

/**
 * tomoyo_read_unlock - Release lock for protecting policy.
 *
 * @idx: Index number returned by tomoyo_read_lock().
 *
 * Returns nothing.
 */
static inline void tomoyo_read_unlock(int idx)
{
	srcu_read_unlock(&tomoyo_ss, idx);
}

/**
 * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 *
 * @a: Pointer to "struct tomoyo_path_info".
 * @b: Pointer to "struct tomoyo_path_info".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
				  const struct tomoyo_path_info *b)
{
	return a->hash != b->hash || strcmp(a->name, b->name);
}

/**
 * tomoyo_put_name - Drop reference on "struct tomoyo_name".
 *
 * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
 *
 * Returns nothing.
 */
static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
{
	if (name) {
		struct tomoyo_name *ptr =
			container_of(name, typeof(*ptr), entry);
		atomic_dec(&ptr->head.users);
	}
}

/**
 * tomoyo_put_group - Drop reference on "struct tomoyo_group".
 *
 * @group: Pointer to "struct tomoyo_group". Maybe NULL.
 *
 * Returns nothing.
 */
static inline void tomoyo_put_group(struct tomoyo_group *group)
{
	if (group)
		atomic_dec(&group->head.users);
}

/**
 * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
 *
 * Returns pointer to "struct tomoyo_domain_info" for current thread.
 */
static inline struct tomoyo_domain_info *tomoyo_domain(void)
{
	return current_cred()->security;
}

/**
 * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
 *
 * @task: Pointer to "struct task_struct".
 *
 * Returns pointer to "struct tomoyo_security" for specified thread.
 */
static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
							    *task)
{
	return task_cred_xxx(task, security);
}

/**
 * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
 *
 * @a: Pointer to "struct tomoyo_name_union".
 * @b: Pointer to "struct tomoyo_name_union".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_same_name_union
(const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
{
	return a->filename == b->filename && a->group == b->group;
}

/**
 * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
 *
 * @a: Pointer to "struct tomoyo_number_union".
 * @b: Pointer to "struct tomoyo_number_union".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_same_number_union
(const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
{
	return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
		a->group == b->group && a->value_type[0] == b->value_type[0] &&
		a->value_type[1] == b->value_type[1];
}

/**
 * list_for_each_cookie - iterate over a list with cookie.
 * @pos:        the &struct list_head to use as a loop cursor.
 * @head:       the head for your list.
 */
#define list_for_each_cookie(pos, head)					\
	if (!pos)							\
		pos =  srcu_dereference((head)->next, &tomoyo_ss);	\
	for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))

#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */