osfmk/ipc/ipc_port.h

   1 /*
   2  * Copyright (c) 2000-2008 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,
  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  * @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  */
  62 /*
  63  */
  64 /*
  65  *      File:   ipc/ipc_port.h
  66  *      Author: Rich Draves
  67  *      Date:   1989
  68  *
  69  *      Definitions for ports.
  70  */
  71
  72 #ifndef _IPC_IPC_PORT_H_
  73 #define _IPC_IPC_PORT_H_
  74
  75 #if MACH_KERNEL_PRIVATE
  76
  77 #include <mach_rt.h>
  78 #include <mach_assert.h>
  79 #include <mach_debug.h>
  80
  81 #include <mach/mach_types.h>
  82 #include <mach/boolean.h>
  83 #include <mach/kern_return.h>
  84 #include <mach/port.h>
  85
  86 #include <kern/assert.h>
  87 #include <kern/kern_types.h>
  88
  89 #include <ipc/ipc_types.h>
  90 #include <ipc/ipc_object.h>
  91 #include <ipc/ipc_mqueue.h>
  92 #include <ipc/ipc_space.h>
  93
  94 #include <security/_label.h>
  95
  96 /*
  97  *  A receive right (port) can be in four states:
  98  *      1) dead (not active, ip_timestamp has death time)
  99  *      2) in a space (ip_receiver_name != 0, ip_receiver points
 100  *      to the space but doesn't hold a ref for it)
 101  *      3) in transit (ip_receiver_name == 0, ip_destination points
 102  *      to the destination port and holds a ref for it)
 103  *      4) in limbo (ip_receiver_name == 0, ip_destination == IP_NULL)
 104  *
 105  *  If the port is active, and ip_receiver points to some space,
 106  *  then ip_receiver_name != 0, and that space holds receive rights.
 107  *  If the port is not active, then ip_timestamp contains a timestamp
 108  *  taken when the port was destroyed.
 109  */
 110
 111 typedef unsigned int ipc_port_timestamp_t;
 112
 113 struct ipc_port {
 114
 115         /*
 116          * Initial sub-structure in common with ipc_pset
 117          * First element is an ipc_object second is a
 118          * message queue
 119          */
 120         struct ipc_object ip_object;
 121         struct ipc_mqueue ip_messages;
 122
 123         natural_t ip_sprequests:1,      /* send-possible requests outstanding */
 124                   ip_spimportant:1,     /* ... at least one is importance donating */
 125                   ip_impdonation:1,     /* port supports importance donation */
 126                   ip_tempowner:1,       /* dont give donations to current receiver */
 127                   ip_guarded:1,         /* port guarded (use context value as guard) */
 128                   ip_strict_guard:1,    /* Strict guarding; Prevents user manipulation of context values directly */
 129                   ip_reserved:2,
 130                   ip_impcount:24;       /* number of importance donations in nested queue */
 131
 132         union {
 133                 struct ipc_space *receiver;
 134                 struct ipc_port *destination;
 135                 ipc_port_timestamp_t timestamp;
 136         } data;
 137
 138         union {
 139                 ipc_kobject_t kobject;
 140                 ipc_importance_task_t imp_task;
 141                 uintptr_t alias;
 142         } kdata;
 143
 144         struct ipc_port *ip_nsrequest;
 145         struct ipc_port *ip_pdrequest;
 146         struct ipc_port_request *ip_requests;
 147         struct ipc_kmsg *ip_premsg;
 148
 149         mach_vm_address_t ip_context;
 150
 151         mach_port_mscount_t ip_mscount;
 152         mach_port_rights_t ip_srights;
 153         mach_port_rights_t ip_sorights;
 154
 155 #if     MACH_ASSERT
 156 #define IP_NSPARES              4
 157 #define IP_CALLSTACK_MAX        16
 158 /*      queue_chain_t   ip_port_links;*//* all allocated ports */
 159         thread_t        ip_thread;      /* who made me?  thread context */
 160         unsigned long   ip_timetrack;   /* give an idea of "when" created */
 161         uintptr_t       ip_callstack[IP_CALLSTACK_MAX]; /* stack trace */
 162         unsigned long   ip_spares[IP_NSPARES]; /* for debugging */
 163 #endif  /* MACH_ASSERT */
 164 } __attribute__((__packed__));
 165
 166
 167 #define ip_references           ip_object.io_references
 168 #define ip_bits                 ip_object.io_bits
 169
 170 #define ip_receiver_name        ip_messages.imq_receiver_name
 171 #define ip_in_pset              ip_messages.imq_in_pset
 172
 173 #define ip_receiver             data.receiver
 174 #define ip_destination          data.destination
 175 #define ip_timestamp            data.timestamp
 176
 177 #define ip_kobject              kdata.kobject
 178 #define ip_imp_task             kdata.imp_task
 179 #define ip_alias                kdata.alias
 180
 181 #define IP_NULL                 IPC_PORT_NULL
 182 #define IP_DEAD                 IPC_PORT_DEAD
 183 #define IP_VALID(port)          IPC_PORT_VALID(port)
 184
 185 #define ip_active(port)         io_active(&(port)->ip_object)
 186 #define ip_lock_init(port)      io_lock_init(&(port)->ip_object)
 187 #define ip_lock(port)           io_lock(&(port)->ip_object)
 188 #define ip_lock_try(port)       io_lock_try(&(port)->ip_object)
 189 #define ip_unlock(port)         io_unlock(&(port)->ip_object)
 190
 191 #define ip_reference(port)      io_reference(&(port)->ip_object)
 192 #define ip_release(port)        io_release(&(port)->ip_object)
 193
 194 #define ip_kotype(port)         io_kotype(&(port)->ip_object)
 195
 196 #define ip_full_kernel(port)    imq_full_kernel(&(port)->ip_messages)
 197 #define ip_full(port)           imq_full(&(port)->ip_messages)
 198
 199 /*
 200  * JMM - Preallocation flag
 201  * This flag indicates that there is a message buffer preallocated for this
 202  * port and we should use that when sending (from the kernel) rather than
 203  * allocate a new one.  This avoids deadlocks during notification message
 204  * sends by critical system threads (which may be needed to free memory and
 205  * therefore cannot be blocked waiting for memory themselves).
 206  */
 207 #define IP_BIT_PREALLOC         0x00008000      /* preallocated mesg */
 208 #define IP_PREALLOC(port)       ((port)->ip_bits & IP_BIT_PREALLOC)
 209
 210 #define IP_SET_PREALLOC(port, kmsg)                                     \
 211 MACRO_BEGIN                                                             \
 212         (port)->ip_bits |= IP_BIT_PREALLOC;                             \
 213         (port)->ip_premsg = (kmsg);                                     \
 214 MACRO_END
 215
 216 #define IP_CLEAR_PREALLOC(port, kmsg)                                   \
 217 MACRO_BEGIN                                                             \
 218         assert((port)->ip_premsg == kmsg);                              \
 219         (port)->ip_bits &= ~IP_BIT_PREALLOC;                            \
 220         (port)->ip_premsg = IKM_NULL;                                   \
 221 MACRO_END
 222
 223 /* JMM - address alignment/packing for LP64 */
 224 struct ipc_port_request {
 225         union {
 226                 struct ipc_port *port;
 227                 ipc_port_request_index_t index;
 228         } notify;
 229
 230         union {
 231                 mach_port_name_t name;
 232                 struct ipc_table_size *size;
 233         } name;
 234 };
 235
 236 #define ipr_next                notify.index
 237 #define ipr_size                name.size
 238
 239 #define ipr_soright             notify.port
 240 #define ipr_name                name.name
 241
 242 /*
 243  * Use the low bits in the ipr_soright to specify the request type
 244  */
 245 #define IPR_SOR_SPARM_MASK      1               /* send-possible armed */
 246 #define IPR_SOR_SPREQ_MASK      2               /* send-possible requested */
 247 #define IPR_SOR_SPBIT_MASK      3               /* combo */
 248 #define IPR_SOR_SPARMED(sor)    (((uintptr_t)(sor) & IPR_SOR_SPARM_MASK) != 0)
 249 #define IPR_SOR_SPREQ(sor)      (((uintptr_t)(sor) & IPR_SOR_SPREQ_MASK) != 0)
 250 #define IPR_SOR_PORT(sor)       ((ipc_port_t)((uintptr_t)(sor) & ~IPR_SOR_SPBIT_MASK))
 251 #define IPR_SOR_MAKE(p,m)       ((ipc_port_t)((uintptr_t)(p) | (m)))
 252
 253 extern lck_grp_t        ipc_lck_grp;
 254 extern lck_attr_t       ipc_lck_attr;
 255
 256 /*
 257  *      Taking the ipc_port_multiple lock grants the privilege
 258  *      to lock multiple ports at once.  No ports must locked
 259  *      when it is taken.
 260  */
 261
 262 extern lck_spin_t ipc_port_multiple_lock_data;
 263
 264 #define ipc_port_multiple_lock_init()                                   \
 265                 lck_spin_init(&ipc_port_multiple_lock_data, &ipc_lck_grp, &ipc_lck_attr)
 266
 267 #define ipc_port_multiple_lock()                                        \
 268                 lck_spin_lock(&ipc_port_multiple_lock_data)
 269
 270 #define ipc_port_multiple_unlock()                                      \
 271                 lck_spin_unlock(&ipc_port_multiple_lock_data)
 272
 273 /*
 274  *      The port timestamp facility provides timestamps
 275  *      for port destruction.  It is used to serialize
 276  *      mach_port_names with port death.
 277  */
 278
 279 extern ipc_port_timestamp_t ipc_port_timestamp_data;
 280
 281 /* Retrieve a port timestamp value */
 282 extern ipc_port_timestamp_t ipc_port_timestamp(void);
 283
 284 /*
 285  *      Compares two timestamps, and returns TRUE if one
 286  *      happened before two.  Note that this formulation
 287  *      works when the timestamp wraps around at 2^32,
 288  *      as long as one and two aren't too far apart.
 289  */
 290
 291 #define IP_TIMESTAMP_ORDER(one, two)    ((int) ((one) - (two)) < 0)
 292
 293 #define ipc_port_translate_receive(space, name, portp)                  \
 294                 ipc_object_translate((space), (name),                   \
 295                                      MACH_PORT_RIGHT_RECEIVE,           \
 296                                      (ipc_object_t *) (portp))
 297
 298 #define ipc_port_translate_send(space, name, portp)                     \
 299                 ipc_object_translate((space), (name),                   \
 300                                      MACH_PORT_RIGHT_SEND,              \
 301                                      (ipc_object_t *) (portp))
 302
 303 /* Allocate a notification request slot */
 304 #if IMPORTANCE_INHERITANCE
 305 extern kern_return_t
 306 ipc_port_request_alloc(
 307         ipc_port_t                      port,
 308         mach_port_name_t                name,
 309         ipc_port_t                      soright,
 310         boolean_t                       send_possible,
 311         boolean_t                       immediate,
 312         ipc_port_request_index_t        *indexp,
 313         boolean_t                       *importantp);
 314 #else
 315 extern kern_return_t
 316 ipc_port_request_alloc(
 317         ipc_port_t                      port,
 318         mach_port_name_t                name,
 319         ipc_port_t                      soright,
 320         boolean_t                       send_possible,
 321         boolean_t                       immediate,
 322         ipc_port_request_index_t        *indexp);
 323 #endif /* IMPORTANCE_INHERITANCE */
 324
 325 /* Grow one of a port's tables of notifcation requests */
 326 extern kern_return_t ipc_port_request_grow(
 327         ipc_port_t                      port,
 328         ipc_table_elems_t               target_size);
 329
 330 /* Return the type(s) of notification requests outstanding */
 331 extern mach_port_type_t ipc_port_request_type(
 332         ipc_port_t                      port,
 333         mach_port_name_t                name,
 334         ipc_port_request_index_t        index);
 335
 336 /* Cancel a notification request and return the send-once right */
 337 extern ipc_port_t ipc_port_request_cancel(
 338         ipc_port_t                      port,
 339         mach_port_name_t                name,
 340         ipc_port_request_index_t        index);
 341
 342 /* Arm any delayed send-possible notification */
 343 #if IMPORTANCE_INHERITANCE
 344 extern boolean_t ipc_port_request_sparm(
 345         ipc_port_t                      port,
 346         mach_port_name_t                name,
 347         ipc_port_request_index_t        index,
 348         mach_msg_option_t               option);
 349 #else
 350 extern boolean_t ipc_port_request_sparm(
 351         ipc_port_t                      port,
 352         mach_port_name_t                name,
 353         ipc_port_request_index_t        index);
 354 #endif /* IMPORTANCE_INHERITANCE */
 355
 356 /* Macros for manipulating a port's dead name notificaiton requests */
 357 #define ipc_port_request_rename(port, index, oname, nname)              \
 358 MACRO_BEGIN                                                             \
 359         ipc_port_request_t ipr, table;                                  \
 360                                                                         \
 361         assert(ip_active(port));                                        \
 362                                                                         \
 363         table = port->ip_requests;                                      \
 364         assert(table != IPR_NULL);                                      \
 365                                                                         \
 366         ipr = &table[index];                                            \
 367         assert(ipr->ipr_name == oname);                                 \
 368                                                                         \
 369         ipr->ipr_name = nname;                                          \
 370 MACRO_END
 371
 372
 373 /* Make a port-deleted request */
 374 extern void ipc_port_pdrequest(
 375         ipc_port_t      port,
 376         ipc_port_t      notify,
 377         ipc_port_t      *previousp);
 378
 379 /* Make a no-senders request */
 380 extern void ipc_port_nsrequest(
 381         ipc_port_t              port,
 382         mach_port_mscount_t     sync,
 383         ipc_port_t              notify,
 384         ipc_port_t              *previousp);
 385
 386 #define ipc_port_set_mscount(port, mscount)                             \
 387 MACRO_BEGIN                                                             \
 388         assert(ip_active(port));                                        \
 389                                                                         \
 390         (port)->ip_mscount = (mscount);                                 \
 391 MACRO_END
 392
 393 /* Prepare a receive right for transmission/destruction */
 394 extern void ipc_port_clear_receiver(
 395         ipc_port_t              port);
 396
 397 /* Initialize a newly-allocated port */
 398 extern void ipc_port_init(
 399         ipc_port_t              port,
 400         ipc_space_t             space,
 401         mach_port_name_t        name);
 402
 403 /* Allocate a port */
 404 extern kern_return_t ipc_port_alloc(
 405         ipc_space_t             space,
 406         mach_port_name_t        *namep,
 407         ipc_port_t              *portp);
 408
 409 /* Allocate a port, with a specific name */
 410 extern kern_return_t ipc_port_alloc_name(
 411         ipc_space_t             space,
 412         mach_port_name_t        name,
 413         ipc_port_t              *portp);
 414
 415 /* Generate dead name notifications */
 416 extern void ipc_port_dnnotify(
 417         ipc_port_t              port);
 418
 419 /* Generate send-possible notifications */
 420 extern void ipc_port_spnotify(
 421         ipc_port_t              port);
 422
 423 /* Destroy a port */
 424 extern void ipc_port_destroy(
 425         ipc_port_t      port);
 426
 427 /* Check if queueing "port" in a message for "dest" would create a circular
 428    group of ports and messages */
 429 extern boolean_t
 430 ipc_port_check_circularity(
 431         ipc_port_t      port,
 432         ipc_port_t      dest);
 433
 434 #if IMPORTANCE_INHERITANCE
 435
 436 enum {
 437         IPID_OPTION_NORMAL       = 0, /* normal boost */
 438         IPID_OPTION_SENDPOSSIBLE = 1, /* send-possible induced boost */
 439 };
 440
 441 /* apply importance delta to port only */
 442 extern mach_port_delta_t
 443 ipc_port_impcount_delta(
 444         ipc_port_t              port,
 445         mach_port_delta_t       delta,
 446         ipc_port_t              base);
 447
 448 /* apply importance delta to port, and return task importance for update */
 449 extern boolean_t
 450 ipc_port_importance_delta_internal(
 451         ipc_port_t              port,
 452         natural_t               options,
 453         mach_port_delta_t       *deltap,
 454         ipc_importance_task_t   *imp_task);
 455
 456 /* Apply an importance delta to a port and reflect change in receiver task */
 457 extern boolean_t
 458 ipc_port_importance_delta(
 459         ipc_port_t              port,
 460         natural_t               options,
 461         mach_port_delta_t       delta);
 462 #endif /* IMPORTANCE_INHERITANCE */
 463
 464 /* Make a send-once notify port from a receive right */
 465 extern ipc_port_t ipc_port_lookup_notify(
 466         ipc_space_t             space,
 467         mach_port_name_t        name);
 468
 469 /* Make a naked send right from a receive right - port locked and active */
 470 extern ipc_port_t ipc_port_make_send_locked(
 471         ipc_port_t      port);
 472
 473 /* Make a naked send right from a receive right */
 474 extern ipc_port_t ipc_port_make_send(
 475         ipc_port_t      port);
 476
 477 /* Make a naked send right from another naked send right */
 478 extern ipc_port_t ipc_port_copy_send(
 479         ipc_port_t      port);
 480
 481 /* Copyout a naked send right */
 482 extern mach_port_name_t ipc_port_copyout_send(
 483         ipc_port_t      sright,
 484         ipc_space_t     space);
 485
 486 #endif /* MACH_KERNEL_PRIVATE */
 487
 488 #if KERNEL_PRIVATE
 489
 490 /* Release a (valid) naked send right */
 491 extern void ipc_port_release_send(
 492         ipc_port_t      port);
 493
 494 extern void ipc_port_reference(
 495         ipc_port_t port);
 496
 497 extern void ipc_port_release(
 498         ipc_port_t port);
 499
 500 #endif /* KERNEL_PRIVATE */
 501
 502 #if MACH_KERNEL_PRIVATE
 503
 504 /* Make a naked send-once right from a locked and active receive right */
 505 extern ipc_port_t ipc_port_make_sonce_locked(
 506         ipc_port_t      port);
 507
 508 /* Make a naked send-once right from a receive right */
 509 extern ipc_port_t ipc_port_make_sonce(
 510         ipc_port_t      port);
 511
 512 /* Release a naked send-once right */
 513 extern void ipc_port_release_sonce(
 514         ipc_port_t      port);
 515
 516 /* Release a naked (in limbo or in transit) receive right */
 517 extern void ipc_port_release_receive(
 518         ipc_port_t      port);
 519
 520 /* finalize the destruction of a port before it gets freed */
 521 extern void ipc_port_finalize(
 522         ipc_port_t      port);
 523
 524 /* Allocate a port in a special space */
 525 extern ipc_port_t ipc_port_alloc_special(
 526         ipc_space_t     space);
 527
 528 /* Deallocate a port in a special space */
 529 extern void ipc_port_dealloc_special(
 530         ipc_port_t      port,
 531         ipc_space_t     space);
 532
 533 #if     MACH_ASSERT
 534 /* Track low-level port deallocation */
 535 extern void ipc_port_track_dealloc(
 536         ipc_port_t      port);
 537
 538 /* Initialize general port debugging state */
 539 extern void ipc_port_debug_init(void);
 540 #endif  /* MACH_ASSERT */
 541
 542 #define ipc_port_alloc_kernel()         \
 543                 ipc_port_alloc_special(ipc_space_kernel)
 544 #define ipc_port_dealloc_kernel(port)   \
 545                 ipc_port_dealloc_special((port), ipc_space_kernel)
 546
 547 #define ipc_port_alloc_reply()          \
 548                 ipc_port_alloc_special(ipc_space_reply)
 549 #define ipc_port_dealloc_reply(port)    \
 550                 ipc_port_dealloc_special((port), ipc_space_reply)
 551
 552 #endif /* MACH_KERNEL_PRIVATE */
 553
 554 #endif  /* _IPC_IPC_PORT_H_ */