security/selinux/include/avc.h

   1 /*
   2  * Access vector cache interface for object managers.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6 #ifndef _SELINUX_AVC_H_
   7 #define _SELINUX_AVC_H_
   8
   9 #include <linux/stddef.h>
  10 #include <linux/errno.h>
  11 #include <linux/kernel.h>
  12 #include <linux/kdev_t.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/init.h>
  15 #include <linux/audit.h>
  16 #include <linux/lsm_audit.h>
  17 #include <linux/in6.h>
  18 #include <asm/system.h>
  19 #include "flask.h"
  20 #include "av_permissions.h"
  21 #include "security.h"
  22
  23 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
  24 extern int selinux_enforcing;
  25 #else
  26 #define selinux_enforcing 1
  27 #endif
  28
  29 /*
  30  * An entry in the AVC.
  31  */
  32 struct avc_entry;
  33
  34 struct task_struct;
  35 struct inode;
  36 struct sock;
  37 struct sk_buff;
  38
  39 /*
  40  * AVC statistics
  41  */
  42 struct avc_cache_stats {
  43         unsigned int lookups;
  44         unsigned int hits;
  45         unsigned int misses;
  46         unsigned int allocations;
  47         unsigned int reclaims;
  48         unsigned int frees;
  49 };
  50
  51 /*
  52  * AVC operations
  53  */
  54
  55 void __init avc_init(void);
  56
  57 int avc_audit(u32 ssid, u32 tsid,
  58                u16 tclass, u32 requested,
  59                struct av_decision *avd,
  60                int result,
  61               struct common_audit_data *a, unsigned flags);
  62
  63 #define AVC_STRICT 1 /* Ignore permissive mode. */
  64 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
  65                          u16 tclass, u32 requested,
  66                          unsigned flags,
  67                          struct av_decision *avd);
  68
  69 int avc_has_perm_flags(u32 ssid, u32 tsid,
  70                        u16 tclass, u32 requested,
  71                        struct common_audit_data *auditdata,
  72                        unsigned);
  73
  74 static inline int avc_has_perm(u32 ssid, u32 tsid,
  75                                u16 tclass, u32 requested,
  76                                struct common_audit_data *auditdata)
  77 {
  78         return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0);
  79 }
  80
  81 u32 avc_policy_seqno(void);
  82
  83 #define AVC_CALLBACK_GRANT              1
  84 #define AVC_CALLBACK_TRY_REVOKE         2
  85 #define AVC_CALLBACK_REVOKE             4
  86 #define AVC_CALLBACK_RESET              8
  87 #define AVC_CALLBACK_AUDITALLOW_ENABLE  16
  88 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
  89 #define AVC_CALLBACK_AUDITDENY_ENABLE   64
  90 #define AVC_CALLBACK_AUDITDENY_DISABLE  128
  91
  92 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
  93                                      u16 tclass, u32 perms,
  94                                      u32 *out_retained),
  95                      u32 events, u32 ssid, u32 tsid,
  96                      u16 tclass, u32 perms);
  97
  98 /* Exported to selinuxfs */
  99 int avc_get_hash_stats(char *page);
 100 extern unsigned int avc_cache_threshold;
 101
 102 /* Attempt to free avc node cache */
 103 void avc_disable(void);
 104
 105 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 106 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
 107 #endif
 108
 109 #endif /* _SELINUX_AVC_H_ */
 110