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1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor basic global and lib definitions
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#ifndef __APPARMOR_H
16#define __APPARMOR_H
17
18#include <linux/slab.h>
19#include <linux/fs.h>
20
21#include "match.h"
22
23/*
24 * Class of mediation types in the AppArmor policy db
25 */
26#define AA_CLASS_ENTRY 0
27#define AA_CLASS_UNKNOWN 1
28#define AA_CLASS_FILE 2
29#define AA_CLASS_CAP 3
30#define AA_CLASS_NET 4
31#define AA_CLASS_RLIMITS 5
32#define AA_CLASS_DOMAIN 6
33
34#define AA_CLASS_LAST AA_CLASS_DOMAIN
35
36/* Control parameters settable through module/boot flags */
37extern enum audit_mode aa_g_audit;
38extern bool aa_g_audit_header;
39extern bool aa_g_debug;
40extern bool aa_g_lock_policy;
41extern bool aa_g_logsyscall;
42extern bool aa_g_paranoid_load;
43extern unsigned int aa_g_path_max;
44
45/*
46 * DEBUG remains global (no per profile flag) since it is mostly used in sysctl
47 * which is not related to profile accesses.
48 */
49
50#define AA_DEBUG(fmt, args...) \
51 do { \
52 if (aa_g_debug && printk_ratelimit()) \
53 printk(KERN_DEBUG "AppArmor: " fmt, ##args); \
54 } while (0)
55
56#define AA_ERROR(fmt, args...) \
57 do { \
58 if (printk_ratelimit()) \
59 printk(KERN_ERR "AppArmor: " fmt, ##args); \
60 } while (0)
61
62/* Flag indicating whether initialization completed */
63extern int apparmor_initialized __initdata;
64
65/* fn's in lib */
66char *aa_split_fqname(char *args, char **ns_name);
67void aa_info_message(const char *str);
68void *__aa_kvmalloc(size_t size, gfp_t flags);
69void kvfree(void *buffer);
70
71static inline void *kvmalloc(size_t size)
72{
73 return __aa_kvmalloc(size, 0);
74}
75
76static inline void *kvzalloc(size_t size)
77{
78 return __aa_kvmalloc(size, __GFP_ZERO);
79}
80
81/* returns 0 if kref not incremented */
82static inline int kref_get_not0(struct kref *kref)
83{
84 return atomic_inc_not_zero(&kref->refcount);
85}
86
87/**
88 * aa_strneq - compare null terminated @str to a non null terminated substring
89 * @str: a null terminated string
90 * @sub: a substring, not necessarily null terminated
91 * @len: length of @sub to compare
92 *
93 * The @str string must be full consumed for this to be considered a match
94 */
95static inline bool aa_strneq(const char *str, const char *sub, int len)
96{
97 return !strncmp(str, sub, len) && !str[len];
98}
99
100/**
101 * aa_dfa_null_transition - step to next state after null character
102 * @dfa: the dfa to match against
103 * @start: the state of the dfa to start matching in
104 *
105 * aa_dfa_null_transition transitions to the next state after a null
106 * character which is not used in standard matching and is only
107 * used to separate pairs.
108 */
109static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa,
110 unsigned int start)
111{
112 /* the null transition only needs the string's null terminator byte */
113 return aa_dfa_next(dfa, start, 0);
114}
115
116static inline bool mediated_filesystem(struct inode *inode)
117{
118 return !(inode->i_sb->s_flags & MS_NOUSER);
119}
120
121#endif /* __APPARMOR_H */