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
27int mls_compute_context_len(struct policydb *p, struct context *context);
28void mls_sid_to_context(struct policydb *p, struct context *context,
29 char **scontext);
30int mls_context_isvalid(struct policydb *p, struct context *c);
31int mls_range_isvalid(struct policydb *p, struct mls_range *r);
32int mls_level_isvalid(struct policydb *p, struct mls_level *l);
33
34int mls_context_to_sid(struct policydb *p, char oldc, char *scontext,
35 struct context *context, struct sidtab *s, u32 def_sid);
36
37int mls_from_string(struct policydb *p, char *str, struct context *context,
38 gfp_t gfp_mask);
39
40int mls_range_set(struct context *context, struct mls_range *range);
41
42int mls_convert_context(struct policydb *oldp, struct policydb *newp,
43 struct context *oldc, struct context *newc);
44
45int mls_compute_sid(struct policydb *p, struct context *scontext,
46 struct context *tcontext, u16 tclass, u32 specified,
47 struct context *newcontext, bool sock);
48
49int mls_setup_user_range(struct policydb *p, struct context *fromcon,
50 struct user_datum *user, struct context *usercon);
51
52#ifdef CONFIG_NETLABEL
53void mls_export_netlbl_lvl(struct policydb *p, struct context *context,
54 struct netlbl_lsm_secattr *secattr);
55void mls_import_netlbl_lvl(struct policydb *p, struct context *context,
56 struct netlbl_lsm_secattr *secattr);
57int mls_export_netlbl_cat(struct policydb *p, struct context *context,
58 struct netlbl_lsm_secattr *secattr);
59int mls_import_netlbl_cat(struct policydb *p, struct context *context,
60 struct netlbl_lsm_secattr *secattr);
61#else
62static inline void mls_export_netlbl_lvl(struct policydb *p,
63 struct context *context,
64 struct netlbl_lsm_secattr *secattr)
65{
66 return;
67}
68static inline void mls_import_netlbl_lvl(struct policydb *p,
69 struct context *context,
70 struct netlbl_lsm_secattr *secattr)
71{
72 return;
73}
74static inline int mls_export_netlbl_cat(struct policydb *p,
75 struct context *context,
76 struct netlbl_lsm_secattr *secattr)
77{
78 return -ENOMEM;
79}
80static 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
88static inline u32 mls_range_hash(const struct mls_range *r, u32 hash)
89{
90 hash = jhash_2words(a: r->level[0].sens, b: r->level[1].sens, initval: hash);
91 hash = ebitmap_hash(e: &r->level[0].cat, hash);
92 hash = ebitmap_hash(e: &r->level[1].cat, hash);
93 return hash;
94}
95
96#endif /* _SS_MLS_H */
97