1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Multi-level security (MLS) policy operations.
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) 2004-2006 Trusted Computer Solutions, Inc.
12 *
13 * Updated: Hewlett-Packard <paul@paul-moore.com>
14 * Added support to import/export the MLS label from NetLabel
15 * Copyright (X) Hewlett-Packard Development Company, L.P., 2006
16 */
17
18 #ifndef _SS_MLS_H_
19 #define _SS_MLS_H_
20
21 #include <linux/jhash.h>
22
23 #include "context.h"
24 #include "ebitmap.h"
25 #include "policydb.h"
26
27 int mls_compute_context_len(struct policydb *p, struct context *context);
28 void mls_sid_to_context(struct policydb *p, struct context *context,
29 char **scontext);
30 int mls_context_isvalid(struct policydb *p, struct context *c);
31 int mls_range_isvalid(struct policydb *p, struct mls_range *r);
32 int mls_level_isvalid(struct policydb *p, struct mls_level *l);
33
34 int mls_context_to_sid(struct policydb *p, char oldc, char *scontext,
35 struct context *context, struct sidtab *s, u32 def_sid);
36
37 int mls_from_string(struct policydb *p, char *str, struct context *context,
38 gfp_t gfp_mask);
39
40 int mls_range_set(struct context *context, struct mls_range *range);
41
42 int mls_convert_context(struct policydb *oldp, struct policydb *newp,
43 struct context *oldc, struct context *newc);
44
45 int mls_compute_sid(struct policydb *p, struct context *scontext,
46 struct context *tcontext, u16 tclass, u32 specified,
47 struct context *newcontext, bool sock);
48
49 int mls_setup_user_range(struct policydb *p, struct context *fromcon,
50 struct user_datum *user, struct context *usercon);
51
52 #ifdef CONFIG_NETLABEL
53 void mls_export_netlbl_lvl(struct policydb *p, struct context *context,
54 struct netlbl_lsm_secattr *secattr);
55 void mls_import_netlbl_lvl(struct policydb *p, struct context *context,
56 struct netlbl_lsm_secattr *secattr);
57 int mls_export_netlbl_cat(struct policydb *p, struct context *context,
58 struct netlbl_lsm_secattr *secattr);
59 int mls_import_netlbl_cat(struct policydb *p, struct context *context,
60 struct netlbl_lsm_secattr *secattr);
61 #else
62 static inline void mls_export_netlbl_lvl(struct policydb *p,
63 struct context *context,
64 struct netlbl_lsm_secattr *secattr)
65 {
66 return;
67 }
68 static inline void mls_import_netlbl_lvl(struct policydb *p,
69 struct context *context,
70 struct netlbl_lsm_secattr *secattr)
71 {
72 return;
73 }
74 static inline int mls_export_netlbl_cat(struct policydb *p,
75 struct context *context,
76 struct netlbl_lsm_secattr *secattr)
77 {
78 return -ENOMEM;
79 }
80 static inline int mls_import_netlbl_cat(struct policydb *p,
81 struct context *context,
82 struct netlbl_lsm_secattr *secattr)
83 {
84 return -ENOMEM;
85 }
86 #endif
87
88 static inline u32 mls_range_hash(const struct mls_range *r, u32 hash)
89 {
90 hash = jhash_2words(r->level[0].sens, r->level[1].sens, hash);
91 hash = ebitmap_hash(&r->level[0].cat, hash);
92 hash = ebitmap_hash(&r->level[1].cat, hash);
93 return hash;
94 }
95
96 #endif /* _SS_MLS_H */
97
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