security/apparmor/include/apparmor.h

   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 */
  37 extern enum audit_mode aa_g_audit;
  38 extern bool aa_g_audit_header;
  39 extern bool aa_g_debug;
  40 extern bool aa_g_lock_policy;
  41 extern bool aa_g_logsyscall;
  42 extern bool aa_g_paranoid_load;
  43 extern 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 */
  63 extern int apparmor_initialized __initdata;
  64
  65 /* fn's in lib */
  66 char *aa_split_fqname(char *args, char **ns_name);
  67 void aa_info_message(const char *str);
  68 void *__aa_kvmalloc(size_t size, gfp_t flags);
  69
  70 static inline void *kvmalloc(size_t size)
  71 {
  72         return __aa_kvmalloc(size, 0);
  73 }
  74
  75 static inline void *kvzalloc(size_t size)
  76 {
  77         return __aa_kvmalloc(size, __GFP_ZERO);
  78 }
  79
  80 /* returns 0 if kref not incremented */
  81 static inline int kref_get_not0(struct kref *kref)
  82 {
  83         return atomic_inc_not_zero(&kref->refcount);
  84 }
  85
  86 /**
  87  * aa_strneq - compare null terminated @str to a non null terminated substring
  88  * @str: a null terminated string
  89  * @sub: a substring, not necessarily null terminated
  90  * @len: length of @sub to compare
  91  *
  92  * The @str string must be full consumed for this to be considered a match
  93  */
  94 static inline bool aa_strneq(const char *str, const char *sub, int len)
  95 {
  96         return !strncmp(str, sub, len) && !str[len];
  97 }
  98
  99 /**
 100  * aa_dfa_null_transition - step to next state after null character
 101  * @dfa: the dfa to match against
 102  * @start: the state of the dfa to start matching in
 103  *
 104  * aa_dfa_null_transition transitions to the next state after a null
 105  * character which is not used in standard matching and is only
 106  * used to separate pairs.
 107  */
 108 static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa,
 109                                                   unsigned int start)
 110 {
 111         /* the null transition only needs the string's null terminator byte */
 112         return aa_dfa_next(dfa, start, 0);
 113 }
 114
 115 static inline bool mediated_filesystem(struct dentry *dentry)
 116 {
 117         return !(dentry->d_sb->s_flags & MS_NOUSER);
 118 }
 119
 120 #endif /* __APPARMOR_H */