LXR linux/security/selinux/ss/mls

   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
  21struct mls_level {
  22        u32 sens;               /* sensitivity */
  23        struct ebitmap cat;     /* category set */
  24};
  25
  26struct mls_range {
  27        struct mls_level level[2]; /* low == level[0], high == level[1] */
  28};
  29
  30static 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
  36static 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_ */
  53