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 misses;
  45         unsigned int allocations;
  46         unsigned int reclaims;
  47         unsigned int frees;
  48 };
  49
  50 /*
  51  * AVC operations
  52  */
  53
  54 void __init avc_init(void);
  55
  56 int avc_audit(u32 ssid, u32 tsid,
  57                u16 tclass, u32 requested,
  58                struct av_decision *avd,
  59                int result,
  60               struct common_audit_data *a, unsigned flags);
  61
  62 #define AVC_STRICT 1 /* Ignore permissive mode. */
  63 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
  64                          u16 tclass, u32 requested,
  65                          unsigned flags,
  66                          struct av_decision *avd);
  67
  68 int avc_has_perm_flags(u32 ssid, u32 tsid,
  69                        u16 tclass, u32 requested,
  70                        struct common_audit_data *auditdata,
  71                        unsigned);
  72
  73 static inline int avc_has_perm(u32 ssid, u32 tsid,
  74                                u16 tclass, u32 requested,
  75                                struct common_audit_data *auditdata)
  76 {
  77         return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0);
  78 }
  79
  80 u32 avc_policy_seqno(void);
  81
  82 #define AVC_CALLBACK_GRANT              1
  83 #define AVC_CALLBACK_TRY_REVOKE         2
  84 #define AVC_CALLBACK_REVOKE             4
  85 #define AVC_CALLBACK_RESET              8
  86 #define AVC_CALLBACK_AUDITALLOW_ENABLE  16
  87 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
  88 #define AVC_CALLBACK_AUDITDENY_ENABLE   64
  89 #define AVC_CALLBACK_AUDITDENY_DISABLE  128
  90
  91 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
  92                                      u16 tclass, u32 perms,
  93                                      u32 *out_retained),
  94                      u32 events, u32 ssid, u32 tsid,
  95                      u16 tclass, u32 perms);
  96
  97 /* Exported to selinuxfs */
  98 int avc_get_hash_stats(char *page);
  99 extern unsigned int avc_cache_threshold;
 100
 101 /* Attempt to free avc node cache */
 102 void avc_disable(void);
 103
 104 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 105 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
 106 #endif
 107
 108 #endif /* _SELINUX_AVC_H_ */
 109