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