FreeBSD/Linux Kernel Cross Reference
sys/security/mac_mls/mac_mls.h

     /*-
      * Copyright (c) 1999-2002 Robert N. M. Watson
      * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed by Robert Watson for the TrustedBSD Project.
      *
      * This software was developed for the FreeBSD Project in part by Network
      * Associates Laboratories, the Security Research Division of Network
     * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
     * as part of the DARPA CHATS research program.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/9.1/sys/security/mac_mls/mac_mls.h 132232 2004-07-16 02:03:50Z rwatson $
     */
    /*
     * Definitions for the TrustedBSD MLS confidentiality policy module.
     */
    #ifndef _SYS_SECURITY_MAC_MLS_H
    #define _SYS_SECURITY_MAC_MLS_H
    
    #define MAC_MLS_EXTATTR_NAMESPACE       EXTATTR_NAMESPACE_SYSTEM
    #define MAC_MLS_EXTATTR_NAME            "mac_mls"
    
    #define MAC_MLS_LABEL_NAME              "mls"
    
    #define MAC_MLS_FLAG_EFFECTIVE  0x00000001      /* mm_effective initialized */
    #define MAC_MLS_FLAG_RANGE      0x00000002      /* mm_range* initialized */
    #define MAC_MLS_FLAGS_BOTH      (MAC_MLS_FLAG_EFFECTIVE | MAC_MLS_FLAG_RANGE)
    
    #define MAC_MLS_TYPE_UNDEF      0       /* Undefined */
    #define MAC_MLS_TYPE_LEVEL      1       /* Hierarchal level with mm_level. */
    #define MAC_MLS_TYPE_LOW        2       /* Dominated by any
                                             * MAC_MLS_TYPE_LABEL. */
    #define MAC_MLS_TYPE_HIGH       3       /* Dominates any
                                             * MAC_MLS_TYPE_LABEL. */
    #define MAC_MLS_TYPE_EQUAL      4       /* Equivilent to any
                                             * MAC_MLS_TYPE_LABEL. */
    
    /*
     * Structures and constants associated with a Multi-Level Security policy.
     * mac_mls represents an MLS label, with mm_type determining its properties,
     * and mm_level represents the hierarchal sensitivity level if valid for the
     * current mm_type.  If compartments are used, the same semantics apply as
     * long as the suject is in every compartment the object is in.  LOW, EQUAL
     * and HIGH cannot be in compartments.
     */
    
    /*
     * MLS compartments bit set size (in bits).
     */
    #define MAC_MLS_MAX_COMPARTMENTS        256
    
    struct mac_mls_element {
            u_short mme_type;
            u_short mme_level;
            u_char  mme_compartments[MAC_MLS_MAX_COMPARTMENTS >> 3];
    };
    
    /*
     * MLS labels consist of two components: an effective label, and a label
     * range.  Depending on the context, one or both may be used; the mb_flags
     * field permits the provider to indicate what fields are intended for
     * use.
     */
    struct mac_mls {
            int                     mm_flags;
            struct mac_mls_element  mm_effective;
            struct mac_mls_element  mm_rangelow, mm_rangehigh;
    };
    
    /*
     * MLS compartments bit test/set macros.
     * The range is 1 to MAC_MLS_MAX_COMPARTMENTS.
     */
    #define MAC_MLS_BIT_TEST(b, w) \
            ((w)[(((b) - 1) >> 3)] & (1 << (((b) - 1) & 7)))
    #define MAC_MLS_BIT_SET(b, w) \
            ((w)[(((b) - 1) >> 3)] |= (1 << (((b) - 1) & 7)))
   #define MAC_MLS_BIT_SET_EMPTY(set)      mls_bit_set_empty(set)
   
   #endif /* !_SYS_SECURITY_MAC_MLS_H */

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