osfmk/ipc/ipc_labelh.h

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright (c) 2005-2006 SPARTA, Inc.
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  */
  53
  54 #ifndef _IPC_LABELH_H_
  55 #define _IPC_LABELH_H_
  56
  57 #include <kern/lock.h>
  58 #include <ipc/ipc_port.h>
  59 #include <security/_label.h>
  60
  61 #if CONFIG_MACF_MACH
  62 typedef struct ipc_labelh
  63 {
  64         natural_t         lh_references;
  65         int               lh_type;
  66         struct label      lh_label;
  67         ipc_port_t        lh_port;
  68         decl_mutex_data(,       lh_lock_data)
  69 } *ipc_labelh_t;
  70
  71 #define LABELH_TYPE_KERN        0
  72 #define LABELH_TYPE_USER        1
  73
  74 void labelh_destroy(ipc_port_t port);
  75 ipc_labelh_t labelh_duplicate(ipc_labelh_t old);
  76 ipc_labelh_t labelh_modify(ipc_labelh_t old);
  77 ipc_labelh_t labelh_new(int canblock);
  78 kern_return_t labelh_new_user(ipc_space_t, struct label *, mach_port_name_t *);
  79 void labelh_release(ipc_labelh_t lh);
  80 ipc_labelh_t labelh_reference(ipc_labelh_t lh);
  81
  82 #define lh_reference(lh)        ((lh)->lh_references++)
  83 #define lh_release(lh)                                          \
  84 MACRO_BEGIN                                                     \
  85         assert((lh)->lh_references > 0);                        \
  86         (lh)->lh_references--;                                  \
  87 MACRO_END
  88
  89 extern zone_t ipc_labelh_zone;
  90
  91 #define lh_lock_init(lh)        mutex_init(&(lh)->lh_lock_data, 0)
  92 #define lh_lock(lh)             mutex_lock(&(lh)->lh_lock_data)
  93 #define lh_unlock(lh)           mutex_unlock(&(lh)->lh_lock_data)
  94
  95 /*
  96  * Check the number of references the label handle has left.
  97  * If there are 0 references and this is a kernel-allocated
  98  * label handle, deallocate the associated port.  The
  99  * storage space for the label handle will be deallocated
 100  * as part of the port destruction.  User-allocated label
 101  * handles are destroyed along with their ports.
 102  */
 103 #define lh_check_unlock(lh)                                     \
 104 MACRO_BEGIN                                                     \
 105         _VOLATILE_ natural_t _refs = (lh)->lh_references;       \
 106                                                                 \
 107         lh_unlock(lh);                                          \
 108         if (_refs == 0 && (lh)->lh_type == LABELH_TYPE_KERN)    \
 109                 ipc_port_dealloc_kernel((lh)->lh_port);         \
 110 MACRO_END
 111
 112 #endif /* MAC_MACH */
 113 #endif /* _IPC_LABELH_H_ */