linux/security/selinux/ss/mls.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Multi-level security (MLS) policy operations.
 *
 * Author : Stephen Smalley, <[email protected]>
 */

/*
 * Updated: Trusted Computer Solutions, Inc. <[email protected]>
 *          Support for enhanced MLS infrastructure.
 *          Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
 *
 * Updated: Hewlett-Packard <[email protected]>
 *          Added support to import/export the MLS label from NetLabel
 *          Copyright (X) Hewlett-Packard Development Company, L.P., 2006
 */

#ifndef _SS_MLS_H_
#define _SS_MLS_H_

#include <linux/jhash.h>

#include "context.h"
#include "ebitmap.h"
#include "policydb.h"

int mls_compute_context_len(struct policydb *p, struct context *context);
void mls_sid_to_context(struct policydb *p, struct context *context,
			char **scontext);
int mls_context_isvalid(struct policydb *p, struct context *c);
int mls_range_isvalid(struct policydb *p, struct mls_range *r);
int mls_level_isvalid(struct policydb *p, struct mls_level *l);

int mls_context_to_sid(struct policydb *p, char oldc, char *scontext,
		       struct context *context, struct sidtab *s, u32 def_sid);

int mls_from_string(struct policydb *p, char *str, struct context *context,
		    gfp_t gfp_mask);

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

int mls_convert_context(struct policydb *oldp, struct policydb *newp,
			struct context *oldc, struct context *newc);

int mls_compute_sid(struct policydb *p, struct context *scontext,
		    struct context *tcontext, u16 tclass, u32 specified,
		    struct context *newcontext, bool sock);

int mls_setup_user_range(struct policydb *p, struct context *fromcon,
			 struct user_datum *user, struct context *usercon);

#ifdef CONFIG_NETLABEL
void mls_export_netlbl_lvl(struct policydb *p, struct context *context,
			   struct netlbl_lsm_secattr *secattr);
void mls_import_netlbl_lvl(struct policydb *p, struct context *context,
			   struct netlbl_lsm_secattr *secattr);
int mls_export_netlbl_cat(struct policydb *p, struct context *context,
			  struct netlbl_lsm_secattr *secattr);
int mls_import_netlbl_cat(struct policydb *p, struct context *context,
			  struct netlbl_lsm_secattr *secattr);
#else
static inline void mls_export_netlbl_lvl(struct policydb *p,
					 struct context *context,
					 struct netlbl_lsm_secattr *secattr)
{
	return;
}
static inline void mls_import_netlbl_lvl(struct policydb *p,
					 struct context *context,
					 struct netlbl_lsm_secattr *secattr)
{
	return;
}
static inline int mls_export_netlbl_cat(struct policydb *p,
					struct context *context,
					struct netlbl_lsm_secattr *secattr)
{
	return -ENOMEM;
}
static inline int mls_import_netlbl_cat(struct policydb *p,
					struct context *context,
					struct netlbl_lsm_secattr *secattr)
{
	return -ENOMEM;
}
#endif

static inline u32 mls_range_hash(const struct mls_range *r, u32 hash)
{
	hash = jhash_2words(r->level[0].sens, r->level[1].sens, hash);
	hash = ebitmap_hash(&r->level[0].cat, hash);
	hash = ebitmap_hash(&r->level[1].cat, hash);
	return hash;
}

#endif /* _SS_MLS_H */