1  /* SPDX-License-Identifier: GPL-2.0 */
2  /*
3   * Multi-level security (MLS) policy operations.
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) 2004-2006 Trusted Computer Solutions, Inc.
13   */
14  /*
15   * Updated: Hewlett-Packard <paul@paul-moore.com>
16   *
17   *	Added support to import/export the MLS label from NetLabel
18   *
19   * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
20   */
21  
22  #ifndef _SS_MLS_H_
23  #define _SS_MLS_H_
24  
25  #include <linux/jhash.h>
26  
27  #include "context.h"
28  #include "ebitmap.h"
29  #include "policydb.h"
30  
31  int mls_compute_context_len(struct policydb *p, struct context *context);
32  void mls_sid_to_context(struct policydb *p, struct context *context,
33  			char **scontext);
34  int mls_context_isvalid(struct policydb *p, struct context *c);
35  int mls_range_isvalid(struct policydb *p, struct mls_range *r);
36  int mls_level_isvalid(struct policydb *p, struct mls_level *l);
37  
38  int mls_context_to_sid(struct policydb *p,
39  		       char oldc,
40  		       char *scontext,
41  		       struct context *context,
42  		       struct sidtab *s,
43  		       u32 def_sid);
44  
45  int mls_from_string(struct policydb *p, char *str, struct context *context,
46  		    gfp_t gfp_mask);
47  
48  int mls_range_set(struct context *context, struct mls_range *range);
49  
50  int mls_convert_context(struct policydb *oldp,
51  			struct policydb *newp,
52  			struct context *oldc,
53  			struct context *newc);
54  
55  int mls_compute_sid(struct policydb *p,
56  		    struct context *scontext,
57  		    struct context *tcontext,
58  		    u16 tclass,
59  		    u32 specified,
60  		    struct context *newcontext,
61  		    bool sock);
62  
63  int mls_setup_user_range(struct policydb *p,
64  			 struct context *fromcon, struct user_datum *user,
65  			 struct context *usercon);
66  
67  #ifdef CONFIG_NETLABEL
68  void mls_export_netlbl_lvl(struct policydb *p,
69  			   struct context *context,
70  			   struct netlbl_lsm_secattr *secattr);
71  void mls_import_netlbl_lvl(struct policydb *p,
72  			   struct context *context,
73  			   struct netlbl_lsm_secattr *secattr);
74  int mls_export_netlbl_cat(struct policydb *p,
75  			  struct context *context,
76  			  struct netlbl_lsm_secattr *secattr);
77  int mls_import_netlbl_cat(struct policydb *p,
78  			  struct context *context,
79  			  struct netlbl_lsm_secattr *secattr);
80  #else
mls_export_netlbl_lvl(struct policydb * p,struct context * context,struct netlbl_lsm_secattr * secattr)81  static inline void mls_export_netlbl_lvl(struct policydb *p,
82  					 struct context *context,
83  					 struct netlbl_lsm_secattr *secattr)
84  {
85  	return;
86  }
mls_import_netlbl_lvl(struct policydb * p,struct context * context,struct netlbl_lsm_secattr * secattr)87  static inline void mls_import_netlbl_lvl(struct policydb *p,
88  					 struct context *context,
89  					 struct netlbl_lsm_secattr *secattr)
90  {
91  	return;
92  }
mls_export_netlbl_cat(struct policydb * p,struct context * context,struct netlbl_lsm_secattr * secattr)93  static inline int mls_export_netlbl_cat(struct policydb *p,
94  					struct context *context,
95  					struct netlbl_lsm_secattr *secattr)
96  {
97  	return -ENOMEM;
98  }
mls_import_netlbl_cat(struct policydb * p,struct context * context,struct netlbl_lsm_secattr * secattr)99  static inline int mls_import_netlbl_cat(struct policydb *p,
100  					struct context *context,
101  					struct netlbl_lsm_secattr *secattr)
102  {
103  	return -ENOMEM;
104  }
105  #endif
106  
mls_range_hash(const struct mls_range * r,u32 hash)107  static inline u32 mls_range_hash(const struct mls_range *r, u32 hash)
108  {
109  	hash = jhash_2words(r->level[0].sens, r->level[1].sens, hash);
110  	hash = ebitmap_hash(&r->level[0].cat, hash);
111  	hash = ebitmap_hash(&r->level[1].cat, hash);
112  	return hash;
113  }
114  
115  #endif	/* _SS_MLS_H */
116  
117