include/uapi/linux/android/binder.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Copyright (C) 2008 Google, Inc.
   4  *
   5  * Based on, but no longer compatible with, the original
   6  * OpenBinder.org binder driver interface, which is:
   7  *
   8  * Copyright (c) 2005 Palmsource, Inc.
   9  *
  10  * This software is licensed under the terms of the GNU General Public
  11  * License version 2, as published by the Free Software Foundation, and
  12  * may be copied, distributed, and modified under those terms.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #ifndef _UAPI_LINUX_BINDER_H
  22 #define _UAPI_LINUX_BINDER_H
  23
  24 #include <linux/types.h>
  25 #include <linux/ioctl.h>
  26
  27 #define B_PACK_CHARS(c1, c2, c3, c4) \
  28         ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
  29 #define B_TYPE_LARGE 0x85
  30
  31 enum {
  32         BINDER_TYPE_BINDER      = B_PACK_CHARS('s', 'b', '*', B_TYPE_LARGE),
  33         BINDER_TYPE_WEAK_BINDER = B_PACK_CHARS('w', 'b', '*', B_TYPE_LARGE),
  34         BINDER_TYPE_HANDLE      = B_PACK_CHARS('s', 'h', '*', B_TYPE_LARGE),
  35         BINDER_TYPE_WEAK_HANDLE = B_PACK_CHARS('w', 'h', '*', B_TYPE_LARGE),
  36         BINDER_TYPE_FD          = B_PACK_CHARS('f', 'd', '*', B_TYPE_LARGE),
  37         BINDER_TYPE_FDA         = B_PACK_CHARS('f', 'd', 'a', B_TYPE_LARGE),
  38         BINDER_TYPE_PTR         = B_PACK_CHARS('p', 't', '*', B_TYPE_LARGE),
  39 };
  40
  41 enum {
  42         FLAT_BINDER_FLAG_PRIORITY_MASK = 0xff,
  43         FLAT_BINDER_FLAG_ACCEPTS_FDS = 0x100,
  44
  45         /**
  46          * @FLAT_BINDER_FLAG_TXN_SECURITY_CTX: request security contexts
  47          *
  48          * Only when set, causes senders to include their security
  49          * context
  50          */
  51         FLAT_BINDER_FLAG_TXN_SECURITY_CTX = 0x1000,
  52 };
  53
  54 #ifdef BINDER_IPC_32BIT
  55 typedef __u32 binder_size_t;
  56 typedef __u32 binder_uintptr_t;
  57 #else
  58 typedef __u64 binder_size_t;
  59 typedef __u64 binder_uintptr_t;
  60 #endif
  61
  62 /**
  63  * struct binder_object_header - header shared by all binder metadata objects.
  64  * @type:       type of the object
  65  */
  66 struct binder_object_header {
  67         __u32        type;
  68 };
  69
  70 /*
  71  * This is the flattened representation of a Binder object for transfer
  72  * between processes.  The 'offsets' supplied as part of a binder transaction
  73  * contains offsets into the data where these structures occur.  The Binder
  74  * driver takes care of re-writing the structure type and data as it moves
  75  * between processes.
  76  */
  77 struct flat_binder_object {
  78         struct binder_object_header     hdr;
  79         __u32                           flags;
  80
  81         /* 8 bytes of data. */
  82         union {
  83                 binder_uintptr_t        binder; /* local object */
  84                 __u32                   handle; /* remote object */
  85         };
  86
  87         /* extra data associated with local object */
  88         binder_uintptr_t        cookie;
  89 };
  90
  91 /**
  92  * struct binder_fd_object - describes a filedescriptor to be fixed up.
  93  * @hdr:        common header structure
  94  * @pad_flags:  padding to remain compatible with old userspace code
  95  * @pad_binder: padding to remain compatible with old userspace code
  96  * @fd:         file descriptor
  97  * @cookie:     opaque data, used by user-space
  98  */
  99 struct binder_fd_object {
 100         struct binder_object_header     hdr;
 101         __u32                           pad_flags;
 102         union {
 103                 binder_uintptr_t        pad_binder;
 104                 __u32                   fd;
 105         };
 106
 107         binder_uintptr_t                cookie;
 108 };
 109
 110 /* struct binder_buffer_object - object describing a userspace buffer
 111  * @hdr:                common header structure
 112  * @flags:              one or more BINDER_BUFFER_* flags
 113  * @buffer:             address of the buffer
 114  * @length:             length of the buffer
 115  * @parent:             index in offset array pointing to parent buffer
 116  * @parent_offset:      offset in @parent pointing to this buffer
 117  *
 118  * A binder_buffer object represents an object that the
 119  * binder kernel driver can copy verbatim to the target
 120  * address space. A buffer itself may be pointed to from
 121  * within another buffer, meaning that the pointer inside
 122  * that other buffer needs to be fixed up as well. This
 123  * can be done by setting the BINDER_BUFFER_FLAG_HAS_PARENT
 124  * flag in @flags, by setting @parent buffer to the index
 125  * in the offset array pointing to the parent binder_buffer_object,
 126  * and by setting @parent_offset to the offset in the parent buffer
 127  * at which the pointer to this buffer is located.
 128  */
 129 struct binder_buffer_object {
 130         struct binder_object_header     hdr;
 131         __u32                           flags;
 132         binder_uintptr_t                buffer;
 133         binder_size_t                   length;
 134         binder_size_t                   parent;
 135         binder_size_t                   parent_offset;
 136 };
 137
 138 enum {
 139         BINDER_BUFFER_FLAG_HAS_PARENT = 0x01,
 140 };
 141
 142 /* struct binder_fd_array_object - object describing an array of fds in a buffer
 143  * @hdr:                common header structure
 144  * @pad:                padding to ensure correct alignment
 145  * @num_fds:            number of file descriptors in the buffer
 146  * @parent:             index in offset array to buffer holding the fd array
 147  * @parent_offset:      start offset of fd array in the buffer
 148  *
 149  * A binder_fd_array object represents an array of file
 150  * descriptors embedded in a binder_buffer_object. It is
 151  * different from a regular binder_buffer_object because it
 152  * describes a list of file descriptors to fix up, not an opaque
 153  * blob of memory, and hence the kernel needs to treat it differently.
 154  *
 155  * An example of how this would be used is with Android's
 156  * native_handle_t object, which is a struct with a list of integers
 157  * and a list of file descriptors. The native_handle_t struct itself
 158  * will be represented by a struct binder_buffer_objct, whereas the
 159  * embedded list of file descriptors is represented by a
 160  * struct binder_fd_array_object with that binder_buffer_object as
 161  * a parent.
 162  */
 163 struct binder_fd_array_object {
 164         struct binder_object_header     hdr;
 165         __u32                           pad;
 166         binder_size_t                   num_fds;
 167         binder_size_t                   parent;
 168         binder_size_t                   parent_offset;
 169 };
 170
 171 /*
 172  * On 64-bit platforms where user code may run in 32-bits the driver must
 173  * translate the buffer (and local binder) addresses appropriately.
 174  */
 175
 176 struct binder_write_read {
 177         binder_size_t           write_size;     /* bytes to write */
 178         binder_size_t           write_consumed; /* bytes consumed by driver */
 179         binder_uintptr_t        write_buffer;
 180         binder_size_t           read_size;      /* bytes to read */
 181         binder_size_t           read_consumed;  /* bytes consumed by driver */
 182         binder_uintptr_t        read_buffer;
 183 };
 184
 185 /* Use with BINDER_VERSION, driver fills in fields. */
 186 struct binder_version {
 187         /* driver protocol version -- increment with incompatible change */
 188         __s32       protocol_version;
 189 };
 190
 191 /* This is the current protocol version. */
 192 #ifdef BINDER_IPC_32BIT
 193 #define BINDER_CURRENT_PROTOCOL_VERSION 7
 194 #else
 195 #define BINDER_CURRENT_PROTOCOL_VERSION 8
 196 #endif
 197
 198 /*
 199  * Use with BINDER_GET_NODE_DEBUG_INFO, driver reads ptr, writes to all fields.
 200  * Set ptr to NULL for the first call to get the info for the first node, and
 201  * then repeat the call passing the previously returned value to get the next
 202  * nodes.  ptr will be 0 when there are no more nodes.
 203  */
 204 struct binder_node_debug_info {
 205         binder_uintptr_t ptr;
 206         binder_uintptr_t cookie;
 207         __u32            has_strong_ref;
 208         __u32            has_weak_ref;
 209 };
 210
 211 struct binder_node_info_for_ref {
 212         __u32            handle;
 213         __u32            strong_count;
 214         __u32            weak_count;
 215         __u32            reserved1;
 216         __u32            reserved2;
 217         __u32            reserved3;
 218 };
 219
 220 struct binder_freeze_info {
 221         __u32            pid;
 222         __u32            enable;
 223         __u32            timeout_ms;
 224 };
 225
 226 struct binder_frozen_status_info {
 227         __u32            pid;
 228
 229         /* process received sync transactions since last frozen
 230          * bit 0: received sync transaction after being frozen
 231          * bit 1: new pending sync transaction during freezing
 232          */
 233         __u32            sync_recv;
 234
 235         /* process received async transactions since last frozen */
 236         __u32            async_recv;
 237 };
 238
 239 struct binder_frozen_state_info {
 240         binder_uintptr_t cookie;
 241         __u32            is_frozen;
 242         __u32            reserved;
 243 };
 244
 245 /* struct binder_extened_error - extended error information
 246  * @id:         identifier for the failed operation
 247  * @command:    command as defined by binder_driver_return_protocol
 248  * @param:      parameter holding a negative errno value
 249  *
 250  * Used with BINDER_GET_EXTENDED_ERROR. This extends the error information
 251  * returned by the driver upon a failed operation. Userspace can pull this
 252  * data to properly handle specific error scenarios.
 253  */
 254 struct binder_extended_error {
 255         __u32   id;
 256         __u32   command;
 257         __s32   param;
 258 };
 259
 260 enum {
 261         BINDER_WRITE_READ               = _IOWR('b', 1, struct binder_write_read),
 262         BINDER_SET_IDLE_TIMEOUT         = _IOW('b', 3, __s64),
 263         BINDER_SET_MAX_THREADS          = _IOW('b', 5, __u32),
 264         BINDER_SET_IDLE_PRIORITY        = _IOW('b', 6, __s32),
 265         BINDER_SET_CONTEXT_MGR          = _IOW('b', 7, __s32),
 266         BINDER_THREAD_EXIT              = _IOW('b', 8, __s32),
 267         BINDER_VERSION                  = _IOWR('b', 9, struct binder_version),
 268         BINDER_GET_NODE_DEBUG_INFO      = _IOWR('b', 11, struct binder_node_debug_info),
 269         BINDER_GET_NODE_INFO_FOR_REF    = _IOWR('b', 12, struct binder_node_info_for_ref),
 270         BINDER_SET_CONTEXT_MGR_EXT      = _IOW('b', 13, struct flat_binder_object),
 271         BINDER_FREEZE                   = _IOW('b', 14, struct binder_freeze_info),
 272         BINDER_GET_FROZEN_INFO          = _IOWR('b', 15, struct binder_frozen_status_info),
 273         BINDER_ENABLE_ONEWAY_SPAM_DETECTION     = _IOW('b', 16, __u32),
 274         BINDER_GET_EXTENDED_ERROR       = _IOWR('b', 17, struct binder_extended_error),
 275 };
 276
 277 /*
 278  * NOTE: Two special error codes you should check for when calling
 279  * in to the driver are:
 280  *
 281  * EINTR -- The operation has been interupted.  This should be
 282  * handled by retrying the ioctl() until a different error code
 283  * is returned.
 284  *
 285  * ECONNREFUSED -- The driver is no longer accepting operations
 286  * from your process.  That is, the process is being destroyed.
 287  * You should handle this by exiting from your process.  Note
 288  * that once this error code is returned, all further calls to
 289  * the driver from any thread will return this same code.
 290  */
 291
 292 enum transaction_flags {
 293         TF_ONE_WAY      = 0x01, /* this is a one-way call: async, no return */
 294         TF_ROOT_OBJECT  = 0x04, /* contents are the component's root object */
 295         TF_STATUS_CODE  = 0x08, /* contents are a 32-bit status code */
 296         TF_ACCEPT_FDS   = 0x10, /* allow replies with file descriptors */
 297         TF_CLEAR_BUF    = 0x20, /* clear buffer on txn complete */
 298         TF_UPDATE_TXN   = 0x40, /* update the outdated pending async txn */
 299 };
 300
 301 struct binder_transaction_data {
 302         /* The first two are only used for bcTRANSACTION and brTRANSACTION,
 303          * identifying the target and contents of the transaction.
 304          */
 305         union {
 306                 /* target descriptor of command transaction */
 307                 __u32   handle;
 308                 /* target descriptor of return transaction */
 309                 binder_uintptr_t ptr;
 310         } target;
 311         binder_uintptr_t        cookie; /* target object cookie */
 312         __u32           code;           /* transaction command */
 313
 314         /* General information about the transaction. */
 315         __u32           flags;
 316         __kernel_pid_t  sender_pid;
 317         __kernel_uid32_t        sender_euid;
 318         binder_size_t   data_size;      /* number of bytes of data */
 319         binder_size_t   offsets_size;   /* number of bytes of offsets */
 320
 321         /* If this transaction is inline, the data immediately
 322          * follows here; otherwise, it ends with a pointer to
 323          * the data buffer.
 324          */
 325         union {
 326                 struct {
 327                         /* transaction data */
 328                         binder_uintptr_t        buffer;
 329                         /* offsets from buffer to flat_binder_object structs */
 330                         binder_uintptr_t        offsets;
 331                 } ptr;
 332                 __u8    buf[8];
 333         } data;
 334 };
 335
 336 struct binder_transaction_data_secctx {
 337         struct binder_transaction_data transaction_data;
 338         binder_uintptr_t secctx;
 339 };
 340
 341 struct binder_transaction_data_sg {
 342         struct binder_transaction_data transaction_data;
 343         binder_size_t buffers_size;
 344 };
 345
 346 struct binder_ptr_cookie {
 347         binder_uintptr_t ptr;
 348         binder_uintptr_t cookie;
 349 };
 350
 351 struct binder_handle_cookie {
 352         __u32 handle;
 353         binder_uintptr_t cookie;
 354 } __packed;
 355
 356 struct binder_pri_desc {
 357         __s32 priority;
 358         __u32 desc;
 359 };
 360
 361 struct binder_pri_ptr_cookie {
 362         __s32 priority;
 363         binder_uintptr_t ptr;
 364         binder_uintptr_t cookie;
 365 };
 366
 367 enum binder_driver_return_protocol {
 368         BR_ERROR = _IOR('r', 0, __s32),
 369         /*
 370          * int: error code
 371          */
 372
 373         BR_OK = _IO('r', 1),
 374         /* No parameters! */
 375
 376         BR_TRANSACTION_SEC_CTX = _IOR('r', 2,
 377                                       struct binder_transaction_data_secctx),
 378         /*
 379          * binder_transaction_data_secctx: the received command.
 380          */
 381         BR_TRANSACTION = _IOR('r', 2, struct binder_transaction_data),
 382         BR_REPLY = _IOR('r', 3, struct binder_transaction_data),
 383         /*
 384          * binder_transaction_data: the received command.
 385          */
 386
 387         BR_ACQUIRE_RESULT = _IOR('r', 4, __s32),
 388         /*
 389          * not currently supported
 390          * int: 0 if the last bcATTEMPT_ACQUIRE was not successful.
 391          * Else the remote object has acquired a primary reference.
 392          */
 393
 394         BR_DEAD_REPLY = _IO('r', 5),
 395         /*
 396          * The target of the last transaction (either a bcTRANSACTION or
 397          * a bcATTEMPT_ACQUIRE) is no longer with us.  No parameters.
 398          */
 399
 400         BR_TRANSACTION_COMPLETE = _IO('r', 6),
 401         /*
 402          * No parameters... always refers to the last transaction requested
 403          * (including replies).  Note that this will be sent even for
 404          * asynchronous transactions.
 405          */
 406
 407         BR_INCREFS = _IOR('r', 7, struct binder_ptr_cookie),
 408         BR_ACQUIRE = _IOR('r', 8, struct binder_ptr_cookie),
 409         BR_RELEASE = _IOR('r', 9, struct binder_ptr_cookie),
 410         BR_DECREFS = _IOR('r', 10, struct binder_ptr_cookie),
 411         /*
 412          * void *:      ptr to binder
 413          * void *: cookie for binder
 414          */
 415
 416         BR_ATTEMPT_ACQUIRE = _IOR('r', 11, struct binder_pri_ptr_cookie),
 417         /*
 418          * not currently supported
 419          * int: priority
 420          * void *: ptr to binder
 421          * void *: cookie for binder
 422          */
 423
 424         BR_NOOP = _IO('r', 12),
 425         /*
 426          * No parameters.  Do nothing and examine the next command.  It exists
 427          * primarily so that we can replace it with a BR_SPAWN_LOOPER command.
 428          */
 429
 430         BR_SPAWN_LOOPER = _IO('r', 13),
 431         /*
 432          * No parameters.  The driver has determined that a process has no
 433          * threads waiting to service incoming transactions.  When a process
 434          * receives this command, it must spawn a new service thread and
 435          * register it via bcENTER_LOOPER.
 436          */
 437
 438         BR_FINISHED = _IO('r', 14),
 439         /*
 440          * not currently supported
 441          * stop threadpool thread
 442          */
 443
 444         BR_DEAD_BINDER = _IOR('r', 15, binder_uintptr_t),
 445         /*
 446          * void *: cookie
 447          */
 448         BR_CLEAR_DEATH_NOTIFICATION_DONE = _IOR('r', 16, binder_uintptr_t),
 449         /*
 450          * void *: cookie
 451          */
 452
 453         BR_FAILED_REPLY = _IO('r', 17),
 454         /*
 455          * The last transaction (either a bcTRANSACTION or
 456          * a bcATTEMPT_ACQUIRE) failed (e.g. out of memory).  No parameters.
 457          */
 458
 459         BR_FROZEN_REPLY = _IO('r', 18),
 460         /*
 461          * The target of the last sync transaction (either a bcTRANSACTION or
 462          * a bcATTEMPT_ACQUIRE) is frozen.  No parameters.
 463          */
 464
 465         BR_ONEWAY_SPAM_SUSPECT = _IO('r', 19),
 466         /*
 467          * Current process sent too many oneway calls to target, and the last
 468          * asynchronous transaction makes the allocated async buffer size exceed
 469          * detection threshold.  No parameters.
 470          */
 471
 472         BR_TRANSACTION_PENDING_FROZEN = _IO('r', 20),
 473         /*
 474          * The target of the last async transaction is frozen.  No parameters.
 475          */
 476
 477         BR_FROZEN_BINDER = _IOR('r', 21, struct binder_frozen_state_info),
 478         /*
 479          * The cookie and a boolean (is_frozen) that indicates whether the process
 480          * transitioned into a frozen or an unfrozen state.
 481          */
 482
 483         BR_CLEAR_FREEZE_NOTIFICATION_DONE = _IOR('r', 22, binder_uintptr_t),
 484         /*
 485          * void *: cookie
 486          */
 487 };
 488
 489 enum binder_driver_command_protocol {
 490         BC_TRANSACTION = _IOW('c', 0, struct binder_transaction_data),
 491         BC_REPLY = _IOW('c', 1, struct binder_transaction_data),
 492         /*
 493          * binder_transaction_data: the sent command.
 494          */
 495
 496         BC_ACQUIRE_RESULT = _IOW('c', 2, __s32),
 497         /*
 498          * not currently supported
 499          * int:  0 if the last BR_ATTEMPT_ACQUIRE was not successful.
 500          * Else you have acquired a primary reference on the object.
 501          */
 502
 503         BC_FREE_BUFFER = _IOW('c', 3, binder_uintptr_t),
 504         /*
 505          * void *: ptr to transaction data received on a read
 506          */
 507
 508         BC_INCREFS = _IOW('c', 4, __u32),
 509         BC_ACQUIRE = _IOW('c', 5, __u32),
 510         BC_RELEASE = _IOW('c', 6, __u32),
 511         BC_DECREFS = _IOW('c', 7, __u32),
 512         /*
 513          * int: descriptor
 514          */
 515
 516         BC_INCREFS_DONE = _IOW('c', 8, struct binder_ptr_cookie),
 517         BC_ACQUIRE_DONE = _IOW('c', 9, struct binder_ptr_cookie),
 518         /*
 519          * void *: ptr to binder
 520          * void *: cookie for binder
 521          */
 522
 523         BC_ATTEMPT_ACQUIRE = _IOW('c', 10, struct binder_pri_desc),
 524         /*
 525          * not currently supported
 526          * int: priority
 527          * int: descriptor
 528          */
 529
 530         BC_REGISTER_LOOPER = _IO('c', 11),
 531         /*
 532          * No parameters.
 533          * Register a spawned looper thread with the device.
 534          */
 535
 536         BC_ENTER_LOOPER = _IO('c', 12),
 537         BC_EXIT_LOOPER = _IO('c', 13),
 538         /*
 539          * No parameters.
 540          * These two commands are sent as an application-level thread
 541          * enters and exits the binder loop, respectively.  They are
 542          * used so the binder can have an accurate count of the number
 543          * of looping threads it has available.
 544          */
 545
 546         BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14,
 547                                                 struct binder_handle_cookie),
 548         /*
 549          * int: handle
 550          * void *: cookie
 551          */
 552
 553         BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15,
 554                                                 struct binder_handle_cookie),
 555         /*
 556          * int: handle
 557          * void *: cookie
 558          */
 559
 560         BC_DEAD_BINDER_DONE = _IOW('c', 16, binder_uintptr_t),
 561         /*
 562          * void *: cookie
 563          */
 564
 565         BC_TRANSACTION_SG = _IOW('c', 17, struct binder_transaction_data_sg),
 566         BC_REPLY_SG = _IOW('c', 18, struct binder_transaction_data_sg),
 567         /*
 568          * binder_transaction_data_sg: the sent command.
 569          */
 570
 571         BC_REQUEST_FREEZE_NOTIFICATION =
 572                         _IOW('c', 19, struct binder_handle_cookie),
 573         /*
 574          * int: handle
 575          * void *: cookie
 576          */
 577
 578         BC_CLEAR_FREEZE_NOTIFICATION = _IOW('c', 20,
 579                                             struct binder_handle_cookie),
 580         /*
 581          * int: handle
 582          * void *: cookie
 583          */
 584
 585         BC_FREEZE_NOTIFICATION_DONE = _IOW('c', 21, binder_uintptr_t),
 586         /*
 587          * void *: cookie
 588          */
 589 };
 590
 591 #endif /* _UAPI_LINUX_BINDER_H */
 592