LXR linux/security/selinux/ss/mls

   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
  20struct mls_level {
  21        u32 sens;               /* sensitivity */
  22        struct ebitmap cat;     /* category set */
  23};
  24
  25struct mls_range {
  26        struct mls_level level[2]; /* low == level[0], high == level[1] */
  27};
  28
  29static 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
  35static 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, 0));
  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_ */
  52