osfmk/ipc/ipc_kmsg.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, 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,
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  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  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  * NOTICE: This file was modified by McAfee Research in 2004 to introduce
  58  * support for mandatory and extensible security protections.  This notice
  59  * is included in support of clause 2.2 (b) of the Apple Public License,
  60  * Version 2.0.
  61  * Copyright (c) 2005 SPARTA, Inc.
  62  */
  63 /*
  64  */
  65 /*
  66  *      File:   ipc/ipc_kmsg.h
  67  *      Author: Rich Draves
  68  *      Date:   1989
  69  *
  70  *      Definitions for kernel messages.
  71  */
  72
  73 #ifndef _IPC_IPC_KMSG_H_
  74 #define _IPC_IPC_KMSG_H_
  75
  76 #include <mach/vm_types.h>
  77 #include <mach/message.h>
  78 #include <kern/kern_types.h>
  79 #include <kern/assert.h>
  80 #include <kern/macro_help.h>
  81 #include <ipc/ipc_types.h>
  82 #include <ipc/ipc_object.h>
  83
  84 /*
  85  *      This structure is only the header for a kmsg buffer;
  86  *      the actual buffer is normally larger.  The rest of the buffer
  87  *      holds the body of the message.
  88  *
  89  *      In a kmsg, the port fields hold pointers to ports instead
  90  *      of port names.  These pointers hold references.
  91  *
  92  *      The ikm_header.msgh_remote_port field is the destination
  93  *      of the message.
  94  */
  95
  96 struct ipc_kmsg {
  97         mach_msg_size_t                         ikm_size;
  98         struct ipc_kmsg                         *ikm_next;      /* next message on port/discard queue */
  99         struct ipc_kmsg                         *ikm_prev;      /* prev message on port/discard queue */
 100         mach_msg_header_t                       *ikm_header;
 101         ipc_port_t                              ikm_prealloc;   /* port we were preallocated from */
 102         ipc_port_t                              ikm_voucher;    /* voucher port carried */
 103         struct ipc_importance_elem              *ikm_importance;/* inherited from */
 104         queue_chain_t                           ikm_inheritance;/* inherited from link */
 105 };
 106
 107 #if defined(__i386__) || defined(__arm__)
 108 #define IKM_SUPPORT_LEGACY      1
 109 #else
 110 #define IKM_SUPPORT_LEGACY      0
 111 #endif
 112
 113 #define IKM_OVERHEAD            (sizeof(struct ipc_kmsg))
 114
 115 #define ikm_plus_overhead(size) ((mach_msg_size_t)((size) + IKM_OVERHEAD))
 116 #define ikm_less_overhead(size) ((mach_msg_size_t)((size) - IKM_OVERHEAD))
 117
 118 /*
 119  * XXX  For debugging.
 120  */
 121 #define IKM_BOGUS               ((ipc_kmsg_t) 0xffffff10)
 122
 123 /*
 124  *      The size of the kernel message buffers that will be cached.
 125  *      IKM_SAVED_KMSG_SIZE includes overhead; IKM_SAVED_MSG_SIZE doesn't.
 126  */
 127 extern zone_t ipc_kmsg_zone;
 128 #define IKM_SAVED_KMSG_SIZE     256
 129 #define IKM_SAVED_MSG_SIZE      ikm_less_overhead(IKM_SAVED_KMSG_SIZE)
 130
 131 #define ikm_prealloc_inuse_port(kmsg)                                   \
 132         ((kmsg)->ikm_prealloc)
 133
 134 #define ikm_prealloc_inuse(kmsg)                                        \
 135         ((kmsg)->ikm_prealloc != IP_NULL)
 136
 137 #define ikm_prealloc_set_inuse(kmsg, port)                              \
 138 MACRO_BEGIN                                                             \
 139         assert((port) != IP_NULL);                                      \
 140         (kmsg)->ikm_prealloc = (port);                                  \
 141         ip_reference(port);                                             \
 142 MACRO_END
 143
 144 #define ikm_prealloc_clear_inuse(kmsg, port)                            \
 145 MACRO_BEGIN                                                             \
 146         (kmsg)->ikm_prealloc = IP_NULL;                                 \
 147 MACRO_END
 148
 149 #define ikm_init(kmsg, size)                                            \
 150 MACRO_BEGIN                                                             \
 151         (kmsg)->ikm_size = (size);                                      \
 152         (kmsg)->ikm_prealloc = IP_NULL;                                 \
 153         (kmsg)->ikm_voucher = IP_NULL;                                  \
 154         (kmsg)->ikm_importance = IIE_NULL;                              \
 155         assert((kmsg)->ikm_prev = (kmsg)->ikm_next = IKM_BOGUS);        \
 156 MACRO_END
 157
 158 #define ikm_check_init(kmsg, size)                                      \
 159 MACRO_BEGIN                                                             \
 160         assert((kmsg)->ikm_size == (size));                             \
 161         assert((kmsg)->ikm_prev == IKM_BOGUS);                          \
 162         assert((kmsg)->ikm_next == IKM_BOGUS);                          \
 163 MACRO_END
 164
 165 #define ikm_set_header(kmsg, mtsize)                                    \
 166 MACRO_BEGIN                                                             \
 167         (kmsg)->ikm_header = (mach_msg_header_t *)                      \
 168         ((vm_offset_t)((kmsg) + 1) + (kmsg)->ikm_size - (mtsize));      \
 169 MACRO_END
 170
 171 struct ipc_kmsg_queue {
 172         struct ipc_kmsg *ikmq_base;
 173 };
 174
 175 typedef struct ipc_kmsg_queue *ipc_kmsg_queue_t;
 176
 177 #define IKMQ_NULL               ((ipc_kmsg_queue_t) 0)
 178
 179
 180 /*
 181  * Exported interfaces
 182  */
 183
 184 #define ipc_kmsg_queue_init(queue)              \
 185 MACRO_BEGIN                                     \
 186         (queue)->ikmq_base = IKM_NULL;          \
 187 MACRO_END
 188
 189 #define ipc_kmsg_queue_empty(queue)     ((queue)->ikmq_base == IKM_NULL)
 190
 191 /* Enqueue a kmsg */
 192 extern void ipc_kmsg_enqueue(
 193         ipc_kmsg_queue_t        queue,
 194         ipc_kmsg_t              kmsg);
 195
 196 /* Dequeue and return a kmsg */
 197 extern ipc_kmsg_t ipc_kmsg_dequeue(
 198         ipc_kmsg_queue_t        queue);
 199
 200 /* Pull a kmsg out of a queue */
 201 extern void ipc_kmsg_rmqueue(
 202         ipc_kmsg_queue_t        queue,
 203         ipc_kmsg_t              kmsg);
 204
 205 #define ipc_kmsg_queue_first(queue)             ((queue)->ikmq_base)
 206
 207 /* Return the kmsg following the given kmsg */
 208 extern ipc_kmsg_t ipc_kmsg_queue_next(
 209         ipc_kmsg_queue_t        queue,
 210         ipc_kmsg_t              kmsg);
 211
 212 #define ipc_kmsg_rmqueue_first_macro(queue, kmsg)                       \
 213 MACRO_BEGIN                                                             \
 214         register ipc_kmsg_t _next;                                      \
 215                                                                         \
 216         assert((queue)->ikmq_base == (kmsg));                           \
 217                                                                         \
 218         _next = (kmsg)->ikm_next;                                       \
 219         if (_next == (kmsg)) {                                          \
 220                 assert((kmsg)->ikm_prev == (kmsg));                     \
 221                 (queue)->ikmq_base = IKM_NULL;                          \
 222         } else {                                                        \
 223                 register ipc_kmsg_t _prev = (kmsg)->ikm_prev;           \
 224                                                                         \
 225                 (queue)->ikmq_base = _next;                             \
 226                 _next->ikm_prev = _prev;                                \
 227                 _prev->ikm_next = _next;                                \
 228         }                                                               \
 229         /* XXX Debug paranoia ASSIGNMENTS */                            \
 230         assert(kmsg->ikm_next = IKM_BOGUS);                             \
 231         assert(kmsg->ikm_prev = IKM_BOGUS);                             \
 232 MACRO_END
 233
 234 #define ipc_kmsg_enqueue_macro(queue, kmsg)                             \
 235 MACRO_BEGIN                                                             \
 236         register ipc_kmsg_t _first = (queue)->ikmq_base;                \
 237                                                                         \
 238         if (_first == IKM_NULL) {                                       \
 239                 (queue)->ikmq_base = (kmsg);                            \
 240                 (kmsg)->ikm_next = (kmsg);                              \
 241                 (kmsg)->ikm_prev = (kmsg);                              \
 242         } else {                                                        \
 243                 register ipc_kmsg_t _last = _first->ikm_prev;           \
 244                                                                         \
 245                 (kmsg)->ikm_next = _first;                              \
 246                 (kmsg)->ikm_prev = _last;                               \
 247                 _first->ikm_prev = (kmsg);                              \
 248                 _last->ikm_next = (kmsg);                               \
 249         }                                                               \
 250 MACRO_END
 251
 252 /* Allocate a kernel message */
 253 extern ipc_kmsg_t ipc_kmsg_alloc(
 254         mach_msg_size_t size);
 255
 256 /* Free a kernel message buffer */
 257 extern void ipc_kmsg_free(
 258         ipc_kmsg_t      kmsg);
 259
 260 /* Destroy kernel message */
 261 extern void ipc_kmsg_destroy(
 262         ipc_kmsg_t      kmsg);
 263
 264 /* Enqueue kernel message for deferred destruction */
 265 extern boolean_t ipc_kmsg_delayed_destroy(
 266         ipc_kmsg_t kmsg);
 267
 268 /* Process all the delayed message destroys */
 269 extern void ipc_kmsg_reap_delayed(void);
 270
 271 /* Preallocate a kernel message buffer */
 272 extern ipc_kmsg_t ipc_kmsg_prealloc(
 273         mach_msg_size_t size);
 274
 275 /* bind a preallocated message buffer to a port */
 276 extern void ipc_kmsg_set_prealloc(
 277         ipc_kmsg_t      kmsg,
 278         ipc_port_t      port);
 279
 280 /* Clear preallocated message buffer binding */
 281 extern void ipc_kmsg_clear_prealloc(
 282         ipc_kmsg_t      kmsg,
 283         ipc_port_t      port);
 284
 285 /* Allocate a kernel message buffer and copy a user message to the buffer */
 286 extern mach_msg_return_t ipc_kmsg_get(
 287         mach_vm_address_t       msg_addr,
 288         mach_msg_size_t         size,
 289         ipc_kmsg_t              *kmsgp);
 290
 291 /* Allocate a kernel message buffer and copy a kernel message to the buffer */
 292 extern mach_msg_return_t ipc_kmsg_get_from_kernel(
 293         mach_msg_header_t       *msg,
 294         mach_msg_size_t         size,
 295         ipc_kmsg_t              *kmsgp);
 296
 297 /* Send a message to a port */
 298 extern mach_msg_return_t ipc_kmsg_send(
 299         ipc_kmsg_t              kmsg,
 300         mach_msg_option_t       option,
 301         mach_msg_timeout_t      timeout_val);
 302
 303 /* Copy a kernel message buffer to a user message */
 304 extern mach_msg_return_t ipc_kmsg_put(
 305         mach_vm_address_t       msg_addr,
 306         ipc_kmsg_t              kmsg,
 307         mach_msg_size_t         size);
 308
 309 /* Copy a kernel message buffer to a kernel message */
 310 extern void ipc_kmsg_put_to_kernel(
 311         mach_msg_header_t       *msg,
 312         ipc_kmsg_t              kmsg,
 313         mach_msg_size_t         size);
 314
 315 /* Copyin port rights in the header of a message */
 316 extern mach_msg_return_t ipc_kmsg_copyin_header(
 317         ipc_kmsg_t              kmsg,
 318         ipc_space_t             space,
 319         mach_msg_option_t       *optionp);
 320
 321 /* Copyin port rights and out-of-line memory from a user message */
 322 extern mach_msg_return_t ipc_kmsg_copyin(
 323         ipc_kmsg_t              kmsg,
 324         ipc_space_t             space,
 325         vm_map_t                map,
 326         mach_msg_option_t       *optionp);
 327
 328 /* Copyin port rights and out-of-line memory from a kernel message */
 329 extern mach_msg_return_t ipc_kmsg_copyin_from_kernel(
 330         ipc_kmsg_t              kmsg);
 331
 332 #if IKM_SUPPORT_LEGACY
 333 extern mach_msg_return_t ipc_kmsg_copyin_from_kernel_legacy(
 334         ipc_kmsg_t      kmsg);
 335 #endif
 336
 337 /* Copyout port rights in the header of a message */
 338 extern mach_msg_return_t ipc_kmsg_copyout_header(
 339         ipc_kmsg_t              kmsg,
 340         ipc_space_t             space,
 341         mach_msg_option_t       option);
 342
 343 /* Copyout a port right returning a name */
 344 extern mach_msg_return_t ipc_kmsg_copyout_object(
 345         ipc_space_t             space,
 346         ipc_object_t            object,
 347         mach_msg_type_name_t    msgt_name,
 348         mach_port_name_t        *namep);
 349
 350 /* Copyout the header and body to a user message */
 351 extern mach_msg_return_t ipc_kmsg_copyout(
 352         ipc_kmsg_t              kmsg,
 353         ipc_space_t             space,
 354         vm_map_t                map,
 355         mach_msg_body_t         *slist,
 356         mach_msg_option_t       option);
 357
 358 /* Copyout port rights and out-of-line memory from the body of a message */
 359 extern mach_msg_return_t ipc_kmsg_copyout_body(
 360         ipc_kmsg_t              kmsg,
 361         ipc_space_t             space,
 362         vm_map_t                map,
 363         mach_msg_body_t         *slist);
 364
 365 /* Copyout port rights and out-of-line memory to a user message,
 366    not reversing the ports in the header */
 367 extern mach_msg_return_t ipc_kmsg_copyout_pseudo(
 368         ipc_kmsg_t              kmsg,
 369         ipc_space_t             space,
 370         vm_map_t                map,
 371         mach_msg_body_t         *slist);
 372
 373 /* Compute size of message as copied out to the specified space/map */
 374 extern mach_msg_size_t ipc_kmsg_copyout_size(
 375         ipc_kmsg_t              kmsg,
 376         vm_map_t                map);
 377
 378 /* Copyout the destination port in the message */
 379 extern void ipc_kmsg_copyout_dest(
 380         ipc_kmsg_t              kmsg,
 381         ipc_space_t             space);
 382
 383 /* kernel's version of ipc_kmsg_copyout_dest */
 384 extern void ipc_kmsg_copyout_to_kernel(
 385         ipc_kmsg_t              kmsg,
 386         ipc_space_t             space);
 387
 388 #if IKM_SUPPORT_LEGACY
 389 extern void ipc_kmsg_copyout_to_kernel_legacy(
 390         ipc_kmsg_t              kmsg,
 391         ipc_space_t             space);
 392 #endif
 393
 394 /* get a scatter list and check consistency */
 395 extern mach_msg_body_t *ipc_kmsg_get_scatter(
 396         mach_vm_address_t       msg_addr,
 397         mach_msg_size_t         slist_size,
 398         ipc_kmsg_t              kmsg);
 399
 400 /* free a scatter list */
 401 extern void ipc_kmsg_free_scatter(
 402         mach_msg_body_t         *slist,
 403         mach_msg_size_t         slist_size);
 404
 405
 406 extern mach_msg_trailer_size_t
 407 ipc_kmsg_add_trailer(ipc_kmsg_t kmsg, ipc_space_t space,
 408                 mach_msg_option_t option, thread_t thread,
 409                 mach_port_seqno_t seqno, boolean_t minimal_trailer,
 410                 mach_vm_offset_t context);
 411
 412 #endif  /* _IPC_IPC_KMSG_H_ */
 413