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
mls_level_eq(struct mls_level * l1,struct mls_level * l2)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
mls_level_dom(struct mls_level * l1,struct mls_level * l2)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_ */
53