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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/security/selinux/ss/mls.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Multi-level security (MLS) policy operations.

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 *

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 * Author : Stephen Smalley, <[email protected]>

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 */

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/*

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 * Updated: Trusted Computer Solutions, Inc. <[email protected]>

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 *          Support for enhanced MLS infrastructure.

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 *          Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.

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 *

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 * Updated: Hewlett-Packard <[email protected]>

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 *          Added support to import/export the MLS label from NetLabel

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 *          Copyright (X) Hewlett-Packard Development Company, L.P., 2006

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 */

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#ifndef _SS_MLS_H_

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#define _SS_MLS_H_

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#include <linux/jhash.h>

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#include "context.h"

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#include "ebitmap.h"

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#include "policydb.h"

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int mls_compute_context_len(struct policydb *p, struct context *context);

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void mls_sid_to_context(struct policydb *p, struct context *context,

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			char **scontext);

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int mls_context_isvalid(struct policydb *p, struct context *c);

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int mls_range_isvalid(struct policydb *p, struct mls_range *r);

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int mls_level_isvalid(struct policydb *p, struct mls_level *l);

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int mls_context_to_sid(struct policydb *p, char oldc, char *scontext,

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		       struct context *context, struct sidtab *s, u32 def_sid);

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int mls_from_string(struct policydb *p, char *str, struct context *context,

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		    gfp_t gfp_mask);

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int mls_range_set(struct context *context, struct mls_range *range);

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int mls_convert_context(struct policydb *oldp, struct policydb *newp,

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			struct context *oldc, struct context *newc);

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int mls_compute_sid(struct policydb *p, struct context *scontext,

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		    struct context *tcontext, u16 tclass, u32 specified,

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		    struct context *newcontext, bool sock);

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int mls_setup_user_range(struct policydb *p, struct context *fromcon,

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			 struct user_datum *user, struct context *usercon);

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#ifdef CONFIG_NETLABEL

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void mls_export_netlbl_lvl(struct policydb *p, struct context *context,

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			   struct netlbl_lsm_secattr *secattr);

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void mls_import_netlbl_lvl(struct policydb *p, struct context *context,

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			   struct netlbl_lsm_secattr *secattr);

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int mls_export_netlbl_cat(struct policydb *p, struct context *context,

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			  struct netlbl_lsm_secattr *secattr);

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int mls_import_netlbl_cat(struct policydb *p, struct context *context,

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			  struct netlbl_lsm_secattr *secattr);

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#else

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static inline void mls_export_netlbl_lvl(struct policydb *p,

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					 struct context *context,

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					 struct netlbl_lsm_secattr *secattr)

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{

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	return;

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}

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static inline void mls_import_netlbl_lvl(struct policydb *p,

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					 struct context *context,

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					 struct netlbl_lsm_secattr *secattr)

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{

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	return;

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}

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static inline int mls_export_netlbl_cat(struct policydb *p,

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					struct context *context,

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					struct netlbl_lsm_secattr *secattr)

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{

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	return -ENOMEM;

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}

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static inline int mls_import_netlbl_cat(struct policydb *p,

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					struct context *context,

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					struct netlbl_lsm_secattr *secattr)

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{

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	return -ENOMEM;

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}

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#endif

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static inline u32 mls_range_hash(const struct mls_range *r, u32 hash)

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{

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	hash = jhash_2words(r->level[0].sens, r->level[1].sens, hash);

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	hash = ebitmap_hash(&r->level[0].cat, hash);

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	hash = ebitmap_hash(&r->level[1].cat, hash);

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	return hash;

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}

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#endif /* _SS_MLS_H */

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