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