release/src-rt-6.x.4708/linux/linux-2.6.36/security/selinux/ss/mls_types.h

   1 /*
   2  * Type definitions for the multi-level security (MLS) policy.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6 /*
   7  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   8  *
   9  *      Support for enhanced MLS infrastructure.
  10  *
  11  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  12  */
  13
  14 #ifndef _SS_MLS_TYPES_H_
  15 #define _SS_MLS_TYPES_H_
  16
  17 #include "security.h"
  18 #include "ebitmap.h"
  19
  20 struct mls_level {
  21         u32 sens;               /* sensitivity */
  22         struct ebitmap cat;     /* category set */
  23 };
  24
  25 struct mls_range {
  26         struct mls_level level[2]; /* low == level[0], high == level[1] */
  27 };
  28
  29 static inline int mls_level_eq(struct mls_level *l1, struct mls_level *l2)
  30 {
  31         return ((l1->sens == l2->sens) &&
  32                 ebitmap_cmp(&l1->cat, &l2->cat));
  33 }
  34
  35 static inline int mls_level_dom(struct mls_level *l1, struct mls_level *l2)
  36 {
  37         return ((l1->sens >= l2->sens) &&
  38                 ebitmap_contains(&l1->cat, &l2->cat));
  39 }
  40
  41 #define mls_level_incomp(l1, l2) \
  42 (!mls_level_dom((l1), (l2)) && !mls_level_dom((l2), (l1)))
  43
  44 #define mls_level_between(l1, l2, l3) \
  45 (mls_level_dom((l1), (l2)) && mls_level_dom((l3), (l1)))
  46
  47 #define mls_range_contains(r1, r2) \
  48 (mls_level_dom(&(r2).level[0], &(r1).level[0]) && \
  49  mls_level_dom(&(r1).level[1], &(r2).level[1]))
  50
  51 #endif  /* _SS_MLS_TYPES_H_ */