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 62typedef 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_lck_mtx_data(, lh_lock_data) 69} *ipc_labelh_t; 70 71#define LABELH_TYPE_KERN 0 72#define LABELH_TYPE_USER 1 73 74void labelh_destroy(ipc_port_t port); 75ipc_labelh_t labelh_duplicate(ipc_labelh_t old); 76ipc_labelh_t labelh_modify(ipc_labelh_t old); 77ipc_labelh_t labelh_new(int canblock); 78kern_return_t labelh_new_user(ipc_space_t, struct label *, mach_port_name_t *); 79void labelh_release(ipc_labelh_t lh); 80ipc_labelh_t labelh_reference(ipc_labelh_t lh); 81 82#define lh_reference(lh) ((lh)->lh_references++) 83#define lh_release(lh) \ 84MACRO_BEGIN \ 85 assert((lh)->lh_references > 0); \ 86 (lh)->lh_references--; \ 87MACRO_END 88 89extern zone_t ipc_labelh_zone; 90 91#define lh_lock_init(lh) lck_mtx_init(&(lh)->lh_lock_data, &ipc_lck_grp, &ipc_lck_attr) 92#define lh_lock_destroy(lh) lck_mtx_destroy(&(lh)->lh_lock_data, &ipc_lck_grp) 93#define lh_lock(lh) lck_mtx_lock(&(lh)->lh_lock_data) 94#define lh_unlock(lh) lck_mtx_unlock(&(lh)->lh_lock_data) 95 96/* 97 * Check the number of references the label handle has left. 98 * If there are 0 references and this is a kernel-allocated 99 * label handle, deallocate the associated port. The 100 * storage space for the label handle will be deallocated 101 * as part of the port destruction. User-allocated label 102 * handles are destroyed along with their ports. 103 */ 104#define lh_check_unlock(lh) \ 105MACRO_BEGIN \ 106 _VOLATILE_ natural_t _refs = (lh)->lh_references; \ 107 \ 108 lh_unlock(lh); \ 109 if (_refs == 0 && (lh)->lh_type == LABELH_TYPE_KERN) \ 110 ipc_port_dealloc_kernel((lh)->lh_port); \ 111MACRO_END 112 113#endif /* MAC_MACH */ 114#endif /* _IPC_LABELH_H_ */ 115