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
20 struct mls_level {
21 u32 sens; /* sensitivity */
22 struct ebitmap cat; /* category set */
23 };
24
25 struct mls_range {
26 struct mls_level level[2]; /* low == level[0], high == level[1] */
27 };
28
mls_level_eq(struct mls_level * l1,struct mls_level * l2)29 static 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
mls_level_dom(struct mls_level * l1,struct mls_level * l2)35 static 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));
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