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