1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Type definitions for the multi-level security (MLS) policy.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 *          Support for enhanced MLS infrastructure.
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(const struct mls_level *l1,
30			       const struct mls_level *l2)
31{
32	return ((l1->sens == l2->sens) && ebitmap_cmp(&l1->cat, &l2->cat));
33}
34
35static inline int mls_level_dom(const struct mls_level *l1,
36				const 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