root/security/selinux/ss/mls_types.h

INCLUDED FROM

DEFINITIONS

1. mls_level_eq
2. mls_level_dom

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Type definitions for the multi-level security (MLS) policy.
   4  *
   5  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
   6  */
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  13  */
  14 
  15 #ifndef _SS_MLS_TYPES_H_
  16 #define _SS_MLS_TYPES_H_
  17 
  18 #include "security.h"
  19 #include "ebitmap.h"
  20 
  21 struct mls_level {
  22         u32 sens;               /* sensitivity */
  23         struct ebitmap cat;     /* category set */
  24 };
  25 
  26 struct mls_range {
  27         struct mls_level level[2]; /* low == level[0], high == level[1] */
  28 };
  29 
  30 static inline int mls_level_eq(struct mls_level *l1, struct mls_level *l2)
  31 {
  32         return ((l1->sens == l2->sens) &&
  33                 ebitmap_cmp(&l1->cat, &l2->cat));
  34 }
  35 
  36 static inline int mls_level_dom(struct mls_level *l1, struct mls_level *l2)
  37 {
  38         return ((l1->sens >= l2->sens) &&
  39                 ebitmap_contains(&l1->cat, &l2->cat, 0));
  40 }
  41 
  42 #define mls_level_incomp(l1, l2) \
  43 (!mls_level_dom((l1), (l2)) && !mls_level_dom((l2), (l1)))
  44 
  45 #define mls_level_between(l1, l2, l3) \
  46 (mls_level_dom((l1), (l2)) && mls_level_dom((l3), (l1)))
  47 
  48 #define mls_range_contains(r1, r2) \
  49 (mls_level_dom(&(r2).level[0], &(r1).level[0]) && \
  50  mls_level_dom(&(r1).level[1], &(r2).level[1]))
  51 
  52 #endif  /* _SS_MLS_TYPES_H_ */