linux-next/fs/xfs/xfs_mac.h

/*
 * Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef __XFS_MAC_H__
#define __XFS_MAC_H__

/*
 * Mandatory Access Control
 *
 * Layout of a composite MAC label:
 * ml_list contains the list of categories (MSEN) followed by the list of
 * divisions (MINT). This is actually a header for the data structure which
 * will have an ml_list with more than one element.
 *
 *      -------------------------------
 *      | ml_msen_type | ml_mint_type |
 *      -------------------------------
 *      | ml_level     | ml_grade     |
 *      -------------------------------
 *      | ml_catcount                 |
 *      -------------------------------
 *      | ml_divcount                 |
 *      -------------------------------
 *      | category 1                  |
 *      | . . .                       |
 *      | category N                  | (where N = ml_catcount)
 *      -------------------------------
 *      | division 1                  |
 *      | . . .                       |
 *      | division M                  | (where M = ml_divcount)
 *      -------------------------------
 */
#define XFS_MAC_MAX_SETS	250
typedef struct xfs_mac_label {
	__uint8_t	ml_msen_type;	/* MSEN label type */
	__uint8_t	ml_mint_type;	/* MINT label type */
	__uint8_t	ml_level;	/* Hierarchical level */
	__uint8_t	ml_grade;	/* Hierarchical grade */
	__uint16_t	ml_catcount;	/* Category count */
	__uint16_t	ml_divcount;	/* Division count */
					/* Category set, then Division set */
	__uint16_t	ml_list[XFS_MAC_MAX_SETS];
} xfs_mac_label_t;

/* MSEN label type names. Choose an upper case ASCII character.  */
#define XFS_MSEN_ADMIN_LABEL	'A'	/* Admin: low<admin != tcsec<high */
#define XFS_MSEN_EQUAL_LABEL	'E'	/* Wildcard - always equal */
#define XFS_MSEN_HIGH_LABEL	'H'	/* System High - always dominates */
#define XFS_MSEN_MLD_HIGH_LABEL	'I'	/* System High, multi-level dir */
#define XFS_MSEN_LOW_LABEL	'L'	/* System Low - always dominated */
#define XFS_MSEN_MLD_LABEL	'M'	/* TCSEC label on a multi-level dir */
#define XFS_MSEN_MLD_LOW_LABEL	'N'	/* System Low, multi-level dir */
#define XFS_MSEN_TCSEC_LABEL	'T'	/* TCSEC label */
#define XFS_MSEN_UNKNOWN_LABEL	'U'	/* unknown label */

/* MINT label type names. Choose a lower case ASCII character.  */
#define XFS_MINT_BIBA_LABEL	'b'	/* Dual of a TCSEC label */
#define XFS_MINT_EQUAL_LABEL	'e'	/* Wildcard - always equal */
#define XFS_MINT_HIGH_LABEL	'h'	/* High Grade - always dominates */
#define XFS_MINT_LOW_LABEL	'l'	/* Low Grade - always dominated */

/* On-disk XFS extended attribute names */
#define SGI_MAC_FILE	"SGI_MAC_FILE"
#define SGI_MAC_FILE_SIZE	(sizeof(SGI_MAC_FILE)-1)


#ifdef __KERNEL__

#ifdef CONFIG_FS_POSIX_MAC

/* NOT YET IMPLEMENTED */

#define MACEXEC		00100
#define MACWRITE	00200
#define MACREAD		00400

struct xfs_inode;
extern int  xfs_mac_iaccess(struct xfs_inode *, mode_t, cred_t *);

#define _MAC_XFS_IACCESS(i,m,c) (xfs_mac_iaccess(i,m,c))
#define _MAC_VACCESS(v,c,m)	(xfs_mac_vaccess(v,c,m))
#define _MAC_EXISTS		xfs_mac_vhaslabel

#else
#define _MAC_XFS_IACCESS(i,m,c)	(0)
#define _MAC_VACCESS(v,c,m)	(0)
#define _MAC_EXISTS		(NULL)
#endif

#endif	/* __KERNEL__ */

#endif	/* __XFS_MAC_H__ */