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 * 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 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 } 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 } 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 } 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 106 107 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