2 * kdbus is free software; you can redistribute it and/or modify it under
3 * the terms of the GNU Lesser General Public License as published by the
4 * Free Software Foundation; either version 2.1 of the License, or (at
5 * your option) any later version.
11 #include <linux/ioctl.h>
12 #include <linux/types.h>
14 #define KDBUS_IOCTL_MAGIC 0x95
15 #define KDBUS_SRC_ID_KERNEL (0)
16 #define KDBUS_DST_ID_NAME (0)
17 #define KDBUS_MATCH_ID_ANY (~0ULL)
18 #define KDBUS_DST_ID_BROADCAST (~0ULL)
19 #define KDBUS_FLAG_KERNEL (1ULL << 63)
22 * struct kdbus_notify_id_change - name registry change message
23 * @id: New or former owner of the name
24 * @flags: flags field from KDBUS_HELLO_*
26 * Sent from kernel to userspace when the owner or activator of
27 * a well-known name changes.
31 * KDBUS_ITEM_ID_REMOVE
33 struct kdbus_notify_id_change {
39 * struct kdbus_notify_name_change - name registry change message
40 * @old_id: ID and flags of former owner of a name
41 * @new_id: ID and flags of new owner of a name
42 * @name: Well-known name
44 * Sent from kernel to userspace when the owner or activator of
45 * a well-known name changes.
49 * KDBUS_ITEM_NAME_REMOVE
50 * KDBUS_ITEM_NAME_CHANGE
52 struct kdbus_notify_name_change {
53 struct kdbus_notify_id_change old_id;
54 struct kdbus_notify_id_change new_id;
59 * struct kdbus_creds - process credentials
64 * @starttime: Starttime of the process
66 * The starttime of the process PID. This is useful to detect PID overruns
67 * from the client side. i.e. if you use the PID to look something up in
68 * /proc/$PID/ you can afterwards check the starttime field of it, to ensure
69 * you didn't run into a PID overrun.
83 * struct kdbus_caps - process capabilities
84 * @last_cap: Highest currently known capability bit
85 * @caps: Variable number of 32-bit capabilities flags
87 * Contains a variable number of 32-bit capabilities flags.
98 * struct kdbus_audit - audit information
99 * @sessionid: The audit session ID
100 * @loginuid: The audit login uid
111 * struct kdbus_timestamp
112 * @seqnum: Global per-domain message sequence number
113 * @monotonic_ns: Monotonic timestamp, in nanoseconds
114 * @realtime_ns: Realtime timestamp, in nanoseconds
117 * KDBUS_ITEM_TIMESTAMP
119 struct kdbus_timestamp {
126 * struct kdbus_vec - I/O vector for kdbus payload items
127 * @size: The size of the vector
128 * @address: Memory address of data buffer
129 * @offset: Offset in the in-message payload memory,
130 * relative to the message head
133 * KDBUS_ITEM_PAYLOAD_VEC, KDBUS_ITEM_PAYLOAD_OFF
144 * struct kdbus_bloom_parameter - bus-wide bloom parameters
145 * @size: Size of the bit field in bytes (m / 8)
146 * @n_hash: Number of hash functions used (k)
148 struct kdbus_bloom_parameter {
154 * struct kdbus_bloom_filter - bloom filter containing n elements
155 * @generation: Generation of the element set in the filter
156 * @data: Bit field, multiple of 8 bytes
158 struct kdbus_bloom_filter {
164 * struct kdbus_memfd - a kdbus memfd
165 * @size: The memfd's size
166 * @fd: The file descriptor number
167 * @__pad: Padding to ensure proper alignment and size
170 * KDBUS_ITEM_PAYLOAD_MEMFD
179 * struct kdbus_name - a registered well-known name with its flags
180 * @flags: Flags from KDBUS_NAME_*
181 * @name: Well-known name
184 * KDBUS_ITEM_OWNED_NAME
192 * struct kdbus_policy_access - policy access item
193 * @type: One of KDBUS_POLICY_ACCESS_* types
194 * @access: Access to grant
195 * @id: For KDBUS_POLICY_ACCESS_USER, the uid
196 * For KDBUS_POLICY_ACCESS_GROUP, the gid
198 struct kdbus_policy_access {
199 __u64 type; /* USER, GROUP, WORLD */
200 __u64 access; /* OWN, TALK, SEE */
201 __u64 id; /* uid, gid, 0 */
205 * enum kdbus_item_type - item types to chain data in a list
206 * @_KDBUS_ITEM_NULL: Uninitialized/invalid
207 * @_KDBUS_ITEM_USER_BASE: Start of user items
208 * @KDBUS_ITEM_PAYLOAD_VEC: Vector to data
209 * @KDBUS_ITEM_PAYLOAD_OFF: Data at returned offset to message head
210 * @KDBUS_ITEM_PAYLOAD_MEMFD: Data as sealed memfd
211 * @KDBUS_ITEM_FDS: Attached file descriptors
212 * @KDBUS_ITEM_BLOOM_PARAMETER: Bus-wide bloom parameters, used with
213 * KDBUS_CMD_BUS_MAKE, carries a
214 * struct kdbus_bloom_parameter
215 * @KDBUS_ITEM_BLOOM_FILTER: Bloom filter carried with a message,
216 * used to match against a bloom mask of a
217 * connection, carries a struct
219 * @KDBUS_ITEM_BLOOM_MASK: Bloom mask used to match against a
220 * message'sbloom filter
221 * @KDBUS_ITEM_DST_NAME: Destination's well-known name
222 * @KDBUS_ITEM_MAKE_NAME: Name of domain, bus, endpoint
223 * @KDBUS_ITEM_ATTACH_FLAGS_SEND: Attach-flags, used for updating which
224 * metadata a connection opts in to send
225 * @KDBUS_ITEM_ATTACH_FLAGS_RECV: Attach-flags, used for updating which
226 * metadata a connection requests to
227 * receive for each reeceived message
228 * @KDBUS_ITEM_ID: Connection ID
229 * @KDBUS_ITEM_NAME: Well-know name with flags
230 * @_KDBUS_ITEM_ATTACH_BASE: Start of metadata attach items
231 * @KDBUS_ITEM_TIMESTAMP: Timestamp
232 * @KDBUS_ITEM_CREDS: Process credential
233 * @KDBUS_ITEM_AUXGROUPS: Auxiliary process groups
234 * @KDBUS_ITEM_OWNED_NAME: A name owned by the associated
236 * @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier
237 * @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier
238 * @KDBUS_ITEM_EXE: The path of the executable
239 * @KDBUS_ITEM_CMDLINE: The process command line
240 * @KDBUS_ITEM_CGROUP: The croup membership
241 * @KDBUS_ITEM_CAPS: The process capabilities
242 * @KDBUS_ITEM_SECLABEL: The security label
243 * @KDBUS_ITEM_AUDIT: The audit IDs
244 * @KDBUS_ITEM_CONN_DESCRIPTION: The connection's human-readable name
246 * @_KDBUS_ITEM_POLICY_BASE: Start of policy items
247 * @KDBUS_ITEM_POLICY_ACCESS: Policy access block
248 * @_KDBUS_ITEM_KERNEL_BASE: Start of kernel-generated message items
249 * @KDBUS_ITEM_NAME_ADD: Notification in kdbus_notify_name_change
250 * @KDBUS_ITEM_NAME_REMOVE: Notification in kdbus_notify_name_change
251 * @KDBUS_ITEM_NAME_CHANGE: Notification in kdbus_notify_name_change
252 * @KDBUS_ITEM_ID_ADD: Notification in kdbus_notify_id_change
253 * @KDBUS_ITEM_ID_REMOVE: Notification in kdbus_notify_id_change
254 * @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached
255 * @KDBUS_ITEM_REPLY_DEAD: Destination died
257 enum kdbus_item_type {
259 _KDBUS_ITEM_USER_BASE,
260 KDBUS_ITEM_PAYLOAD_VEC = _KDBUS_ITEM_USER_BASE,
261 KDBUS_ITEM_PAYLOAD_OFF,
262 KDBUS_ITEM_PAYLOAD_MEMFD,
264 KDBUS_ITEM_BLOOM_PARAMETER,
265 KDBUS_ITEM_BLOOM_FILTER,
266 KDBUS_ITEM_BLOOM_MASK,
268 KDBUS_ITEM_MAKE_NAME,
269 KDBUS_ITEM_ATTACH_FLAGS_SEND,
270 KDBUS_ITEM_ATTACH_FLAGS_RECV,
274 /* keep these item types in sync with KDBUS_ATTACH_* flags */
275 _KDBUS_ITEM_ATTACH_BASE = 0x1000,
276 KDBUS_ITEM_TIMESTAMP = _KDBUS_ITEM_ATTACH_BASE,
278 KDBUS_ITEM_AUXGROUPS,
279 KDBUS_ITEM_OWNED_NAME,
288 KDBUS_ITEM_CONN_DESCRIPTION,
290 _KDBUS_ITEM_POLICY_BASE = 0x2000,
291 KDBUS_ITEM_POLICY_ACCESS = _KDBUS_ITEM_POLICY_BASE,
293 _KDBUS_ITEM_KERNEL_BASE = 0x8000,
294 KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
295 KDBUS_ITEM_NAME_REMOVE,
296 KDBUS_ITEM_NAME_CHANGE,
298 KDBUS_ITEM_ID_REMOVE,
299 KDBUS_ITEM_REPLY_TIMEOUT,
300 KDBUS_ITEM_REPLY_DEAD,
304 * struct kdbus_item - chain of data blocks
305 * @size: Overall data record size
306 * @type: Kdbus_item type of data
307 * @data: Generic bytes
308 * @data32: Generic 32 bit array
309 * @data64: Generic 64 bit array
310 * @str: Generic string
312 * @vec: KDBUS_ITEM_PAYLOAD_VEC
313 * @creds: KDBUS_ITEM_CREDS
314 * @audit: KDBUS_ITEM_AUDIT
315 * @timestamp: KDBUS_ITEM_TIMESTAMP
316 * @name: KDBUS_ITEM_NAME
317 * @bloom_parameter: KDBUS_ITEM_BLOOM_PARAMETER
318 * @bloom_filter: KDBUS_ITEM_BLOOM_FILTER
319 * @memfd: KDBUS_ITEM_PAYLOAD_MEMFD
320 * @name_change: KDBUS_ITEM_NAME_ADD
321 * KDBUS_ITEM_NAME_REMOVE
322 * KDBUS_ITEM_NAME_CHANGE
323 * @id_change: KDBUS_ITEM_ID_ADD
324 * KDBUS_ITEM_ID_REMOVE
325 * @policy: KDBUS_ITEM_POLICY_ACCESS
337 struct kdbus_vec vec;
338 struct kdbus_creds creds;
339 struct kdbus_audit audit;
340 struct kdbus_caps caps;
341 struct kdbus_timestamp timestamp;
342 struct kdbus_name name;
343 struct kdbus_bloom_parameter bloom_parameter;
344 struct kdbus_bloom_filter bloom_filter;
345 struct kdbus_memfd memfd;
347 struct kdbus_notify_name_change name_change;
348 struct kdbus_notify_id_change id_change;
349 struct kdbus_policy_access policy_access;
354 * enum kdbus_msg_flags - type of message
355 * @KDBUS_MSG_FLAGS_EXPECT_REPLY: Expect a reply message, used for
356 * method calls. The userspace-supplied
357 * cookie identifies the message and the
358 * respective reply carries the cookie
360 * @KDBUS_MSG_FLAGS_SYNC_REPLY: Wait for destination connection to
361 * reply to this message. The
362 * KDBUS_CMD_MSG_SEND ioctl() will block
363 * until the reply is received, and
364 * offset_reply in struct kdbus_msg will
365 * yield the offset in the sender's pool
366 * where the reply can be found.
367 * This flag is only valid if
368 * @KDBUS_MSG_FLAGS_EXPECT_REPLY is set as
370 * @KDBUS_MSG_FLAGS_NO_AUTO_START: Do not start a service, if the addressed
371 * name is not currently active
373 enum kdbus_msg_flags {
374 KDBUS_MSG_FLAGS_EXPECT_REPLY = 1ULL << 0,
375 KDBUS_MSG_FLAGS_SYNC_REPLY = 1ULL << 1,
376 KDBUS_MSG_FLAGS_NO_AUTO_START = 1ULL << 2,
380 * enum kdbus_payload_type - type of payload carried by message
381 * @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message
382 * @KDBUS_PAYLOAD_DBUS: D-Bus marshalling "DBusDBus"
384 enum kdbus_payload_type {
385 KDBUS_PAYLOAD_KERNEL,
386 KDBUS_PAYLOAD_DBUS = 0x4442757344427573ULL,
390 * struct kdbus_msg - the representation of a kdbus message
391 * @size: Total size of the message
392 * @flags: Message flags (KDBUS_MSG_FLAGS_*), userspace → kernel
393 * @kernel_flags: Supported message flags, kernel → userspace
394 * @priority: Message queue priority value
395 * @dst_id: 64-bit ID of the destination connection
396 * @src_id: 64-bit ID of the source connection
397 * @payload_type: Payload type (KDBUS_PAYLOAD_*)
398 * @cookie: Userspace-supplied cookie, for the connection
399 * to identify its messages
400 * @timeout_ns: The time to wait for a message reply from the peer.
401 * If there is no reply, a kernel-generated message
402 * with an attached KDBUS_ITEM_REPLY_TIMEOUT item
403 * is sent to @src_id. The timeout is expected in
404 * nanoseconds and as absolute CLOCK_MONOTONIC value.
405 * @cookie_reply: A reply to the requesting message with the same
406 * cookie. The requesting connection can match its
407 * request and the reply with this value
408 * @offset_reply: If KDBUS_MSG_FLAGS_EXPECT_REPLY, this field will
409 * contain the offset in the sender's pool where the
411 * @items: A list of kdbus_items containing the message payload
427 struct kdbus_item items[0];
428 } __attribute__((aligned(8)));
431 * enum kdbus_recv_flags - flags for de-queuing messages
432 * @KDBUS_RECV_PEEK: Return the next queued message without
433 * actually de-queuing it, and without installing
434 * any file descriptors or other resources. It is
435 * usually used to determine the activating
436 * connection of a bus name.
437 * @KDBUS_RECV_DROP: Drop and free the next queued message and all
438 * its resources without actually receiving it.
439 * @KDBUS_RECV_USE_PRIORITY: Only de-queue messages with the specified or
440 * higher priority (lowest values); if not set,
441 * the priority value is ignored.
443 enum kdbus_recv_flags {
444 KDBUS_RECV_PEEK = 1ULL << 0,
445 KDBUS_RECV_DROP = 1ULL << 1,
446 KDBUS_RECV_USE_PRIORITY = 1ULL << 2,
450 * struct kdbus_cmd_recv - struct to de-queue a buffered message
451 * @flags: KDBUS_RECV_* flags, userspace → kernel
452 * @kernel_flags: Supported KDBUS_RECV_* flags, kernel → userspace
453 * @priority: Minimum priority of the messages to de-queue. Lowest
454 * values have the highest priority.
455 * @offset: Returned offset in the pool where the message is
456 * stored. The user must use KDBUS_CMD_FREE to free
457 * the allocated memory.
458 * @dropped_msgs: In case the KDBUS_CMD_MSG_RECV ioctl returns
459 * -EOVERFLOW, this field will contain the number of
460 * broadcast messages that have been lost since the
463 * This struct is used with the KDBUS_CMD_MSG_RECV ioctl.
465 struct kdbus_cmd_recv {
473 } __attribute__((aligned(8)));
476 * struct kdbus_cmd_cancel - struct to cancel a synchronously pending message
477 * @cookie: The cookie of the pending message
478 * @flags: Flags for the free command. Currently unused.
480 * This struct is used with the KDBUS_CMD_CANCEL ioctl.
482 struct kdbus_cmd_cancel {
485 } __attribute__((aligned(8)));
488 * struct kdbus_cmd_free - struct to free a slice of memory in the pool
489 * @offset: The offset of the memory slice, as returned by other
491 * @flags: Flags for the free command, userspace → kernel
492 * @kernel_flags: Supported flags of the free command, userspace → kernel
494 * This struct is used with the KDBUS_CMD_FREE ioctl.
496 struct kdbus_cmd_free {
500 } __attribute__((aligned(8)));
503 * enum kdbus_policy_access_type - permissions of a policy record
504 * @_KDBUS_POLICY_ACCESS_NULL: Uninitialized/invalid
505 * @KDBUS_POLICY_ACCESS_USER: Grant access to a uid
506 * @KDBUS_POLICY_ACCESS_GROUP: Grant access to gid
507 * @KDBUS_POLICY_ACCESS_WORLD: World-accessible
509 enum kdbus_policy_access_type {
510 _KDBUS_POLICY_ACCESS_NULL,
511 KDBUS_POLICY_ACCESS_USER,
512 KDBUS_POLICY_ACCESS_GROUP,
513 KDBUS_POLICY_ACCESS_WORLD,
517 * enum kdbus_policy_access_flags - mode flags
518 * @KDBUS_POLICY_OWN: Allow to own a well-known name
519 * Implies KDBUS_POLICY_TALK and KDBUS_POLICY_SEE
520 * @KDBUS_POLICY_TALK: Allow communication to a well-known name
521 * Implies KDBUS_POLICY_SEE
522 * @KDBUS_POLICY_SEE: Allow to see a well-known name
524 enum kdbus_policy_type {
525 KDBUS_POLICY_SEE = 0,
531 * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello
532 * @KDBUS_HELLO_ACCEPT_FD: The connection allows the reception of
533 * any passed file descriptors
534 * @KDBUS_HELLO_ACTIVATOR: Special-purpose connection which registers
535 * a well-know name for a process to be started
536 * when traffic arrives
537 * @KDBUS_HELLO_POLICY_HOLDER: Special-purpose connection which registers
538 * policy entries for a name. The provided name
539 * is not activated and not registered with the
540 * name database, it only allows unprivileged
541 * connections to aquire a name, talk or discover
543 * @KDBUS_HELLO_MONITOR: Special-purpose connection to monitor
546 enum kdbus_hello_flags {
547 KDBUS_HELLO_ACCEPT_FD = 1ULL << 0,
548 KDBUS_HELLO_ACTIVATOR = 1ULL << 1,
549 KDBUS_HELLO_POLICY_HOLDER = 1ULL << 2,
550 KDBUS_HELLO_MONITOR = 1ULL << 3,
554 * enum kdbus_attach_flags - flags for metadata attachments
555 * @KDBUS_ATTACH_TIMESTAMP: Timestamp
556 * @KDBUS_ATTACH_CREDS: Credentials
557 * @KDBUS_ATTACH_AUXGROUPS: Auxiliary groups
558 * @KDBUS_ATTACH_NAMES: Well-known names
559 * @KDBUS_ATTACH_TID_COMM: The "comm" process identifier of the TID
560 * @KDBUS_ATTACH_PID_COMM: The "comm" process identifier of the PID
561 * @KDBUS_ATTACH_EXE: The path of the executable
562 * @KDBUS_ATTACH_CMDLINE: The process command line
563 * @KDBUS_ATTACH_CGROUP: The croup membership
564 * @KDBUS_ATTACH_CAPS: The process capabilities
565 * @KDBUS_ATTACH_SECLABEL: The security label
566 * @KDBUS_ATTACH_AUDIT: The audit IDs
567 * @KDBUS_ATTACH_CONN_DESCRIPTION: The human-readable connection name
568 * @_KDBUS_ATTACH_ALL: All of the above
569 * @_KDBUS_ATTACH_ANY: Wildcard match to enable any kind of
572 enum kdbus_attach_flags {
573 KDBUS_ATTACH_TIMESTAMP = 1ULL << 0,
574 KDBUS_ATTACH_CREDS = 1ULL << 1,
575 KDBUS_ATTACH_AUXGROUPS = 1ULL << 2,
576 KDBUS_ATTACH_NAMES = 1ULL << 3,
577 KDBUS_ATTACH_TID_COMM = 1ULL << 4,
578 KDBUS_ATTACH_PID_COMM = 1ULL << 5,
579 KDBUS_ATTACH_EXE = 1ULL << 6,
580 KDBUS_ATTACH_CMDLINE = 1ULL << 7,
581 KDBUS_ATTACH_CGROUP = 1ULL << 8,
582 KDBUS_ATTACH_CAPS = 1ULL << 9,
583 KDBUS_ATTACH_SECLABEL = 1ULL << 10,
584 KDBUS_ATTACH_AUDIT = 1ULL << 11,
585 KDBUS_ATTACH_CONN_DESCRIPTION = 1ULL << 12,
586 _KDBUS_ATTACH_ALL = (1ULL << 13) - 1,
587 _KDBUS_ATTACH_ANY = ~0ULL
591 * struct kdbus_cmd_hello - struct to say hello to kdbus
592 * @size: The total size of the structure
593 * @flags: Connection flags (KDBUS_HELLO_*), userspace → kernel
594 * @kernel_flags: Supported connection flags, kernel → userspace
595 * @attach_flags_send: Mask of metadata to attach to each message sent
596 * off by this connection (KDBUS_ATTACH_*)
597 * @attach_flags_recv: Mask of metadata to attach to each message receieved
598 * by the new connection (KDBUS_ATTACH_*)
599 * @bus_flags: The flags field copied verbatim from the original
600 * KDBUS_CMD_BUS_MAKE ioctl. It's intended to be useful
601 * to do negotiation of features of the payload that is
602 * transferred (kernel → userspace)
603 * @id: The ID of this connection (kernel → userspace)
604 * @pool_size: Size of the connection's buffer where the received
605 * messages are placed
606 * @bloom: The bloom properties of the bus, specified
607 * by the bus creator (kernel → userspace)
608 * @id128: Unique 128-bit ID of the bus (kernel → userspace)
609 * @items: A list of items
611 * This struct is used with the KDBUS_CMD_HELLO ioctl.
613 struct kdbus_cmd_hello {
617 __u64 attach_flags_send;
618 __u64 attach_flags_recv;
622 struct kdbus_bloom_parameter bloom;
624 struct kdbus_item items[0];
625 } __attribute__((aligned(8)));
628 * enum kdbus_make_flags - Flags for KDBUS_CMD_{BUS,EP,NS}_MAKE
629 * @KDBUS_MAKE_ACCESS_GROUP: Make the bus or endpoint node group-accessible
630 * @KDBUS_MAKE_ACCESS_WORLD: Make the bus or endpoint node world-accessible
632 enum kdbus_make_flags {
633 KDBUS_MAKE_ACCESS_GROUP = 1ULL << 0,
634 KDBUS_MAKE_ACCESS_WORLD = 1ULL << 1,
638 * struct kdbus_cmd_make - struct to make a bus, an endpoint or a domain
639 * @size: The total size of the struct
640 * @flags: Properties for the bus/ep/domain to create,
642 * @kernel_flags: Supported flags for the used command, kernel → userspace
643 * @items: Items describing details
645 * This structure is used with the KDBUS_CMD_BUS_MAKE and
646 * KDBUS_CMD_ENDPOINT_MAKE ioctls.
648 struct kdbus_cmd_make {
652 struct kdbus_item items[0];
653 } __attribute__((aligned(8)));
656 * enum kdbus_name_flags - properties of a well-known name
657 * @KDBUS_NAME_REPLACE_EXISTING: Try to replace name of other connections
658 * @KDBUS_NAME_ALLOW_REPLACEMENT: Allow the replacement of the name
659 * @KDBUS_NAME_QUEUE: Name should be queued if busy
660 * @KDBUS_NAME_IN_QUEUE: Name is queued
661 * @KDBUS_NAME_ACTIVATOR: Name is owned by a activator connection
663 enum kdbus_name_flags {
664 KDBUS_NAME_REPLACE_EXISTING = 1ULL << 0,
665 KDBUS_NAME_ALLOW_REPLACEMENT = 1ULL << 1,
666 KDBUS_NAME_QUEUE = 1ULL << 2,
667 KDBUS_NAME_IN_QUEUE = 1ULL << 3,
668 KDBUS_NAME_ACTIVATOR = 1ULL << 4,
672 * struct kdbus_cmd_name - struct to describe a well-known name
673 * @size: The total size of the struct
674 * @flags: Flags for a name entry (KDBUS_NAME_*),
675 * userspace → kernel, kernel → userspace
676 * @kernel_flags: Supported flags for a name entry, kernel → userspace
677 * @items: Item list, containing the well-known name as
680 * This structure is used with the KDBUS_CMD_NAME_ACQUIRE ioctl.
682 struct kdbus_cmd_name {
686 struct kdbus_item items[0];
687 } __attribute__((aligned(8)));
690 * struct kdbus_name_info - struct to describe a well-known name
691 * @size: The total size of the struct
692 * @conn_flags: The flags of the owning connection (KDBUS_HELLO_*)
693 * @owner_id: The current owner of the name
694 * @items: Item list, containing the well-known name as
695 * KDBUS_ITEM_OWNED_NAME
697 * This structure is used as return struct for the KDBUS_CMD_NAME_LIST ioctl.
699 struct kdbus_name_info {
703 struct kdbus_item items[0];
704 } __attribute__((aligned(8)));
707 * enum kdbus_name_list_flags - what to include into the returned list
708 * @KDBUS_NAME_LIST_UNIQUE: All active connections
709 * @KDBUS_NAME_LIST_NAMES: All known well-known names
710 * @KDBUS_NAME_LIST_ACTIVATORS: All activator connections
711 * @KDBUS_NAME_LIST_QUEUED: All queued-up names
713 enum kdbus_name_list_flags {
714 KDBUS_NAME_LIST_UNIQUE = 1ULL << 0,
715 KDBUS_NAME_LIST_NAMES = 1ULL << 1,
716 KDBUS_NAME_LIST_ACTIVATORS = 1ULL << 2,
717 KDBUS_NAME_LIST_QUEUED = 1ULL << 3,
721 * struct kdbus_cmd_name_list - request a list of name entries
722 * @flags: Flags for the query (KDBUS_NAME_LIST_*),
724 * @kernel_flags: Supported flags for queries, kernel → userspace
725 * @offset: The returned offset in the caller's pool buffer.
726 * The user must use KDBUS_CMD_FREE to free the
729 * This structure is used with the KDBUS_CMD_NAME_LIST ioctl.
731 struct kdbus_cmd_name_list {
735 } __attribute__((aligned(8)));
738 * struct kdbus_name_list - information returned by KDBUS_CMD_NAME_LIST
739 * @size: The total size of the structure
740 * @names: A list of names
742 * Note that the user is responsible for freeing the allocated memory with
743 * the KDBUS_CMD_FREE ioctl.
745 struct kdbus_name_list {
747 struct kdbus_name_info names[0];
751 * struct kdbus_cmd_info - struct used for KDBUS_CMD_CONN_INFO ioctl
752 * @size: The total size of the struct
753 * @flags: KDBUS_ATTACH_* flags, userspace → kernel
754 * @kernel_flags: Supported KDBUS_ATTACH_* flags, kernel → userspace
755 * @id: The 64-bit ID of the connection. If set to zero, passing
756 * @name is required. kdbus will look up the name to
757 * determine the ID in this case.
758 * @offset: Returned offset in the caller's pool buffer where the
759 * kdbus_info struct result is stored. The user must
760 * use KDBUS_CMD_FREE to free the allocated memory.
761 * @items: The optional item list, containing the
762 * well-known name to look up as a KDBUS_ITEM_NAME.
763 * Only needed in case @id is zero.
765 * On success, the KDBUS_CMD_CONN_INFO ioctl will return 0 and @offset will
766 * tell the user the offset in the connection pool buffer at which to find the
767 * result in a struct kdbus_info.
769 struct kdbus_cmd_info {
775 struct kdbus_item items[0];
776 } __attribute__((aligned(8)));
779 * struct kdbus_info - information returned by KDBUS_CMD_*_INFO
780 * @size: The total size of the struct
781 * @id: The connection's or bus' 64-bit ID
782 * @flags: The connection's or bus' flags
783 * @items: A list of struct kdbus_item
785 * Note that the user is responsible for freeing the allocated memory with
786 * the KDBUS_CMD_FREE ioctl.
792 struct kdbus_item items[0];
796 * struct kdbus_cmd_update - update flags of a connection
797 * @size: The total size of the struct
798 * @flags: Flags for the update command, userspace → kernel
799 * @kernel_flags: Supported flags for this command, kernel → userspace
800 * @items: A list of struct kdbus_item
802 * This struct is used with the KDBUS_CMD_CONN_UPDATE ioctl.
804 struct kdbus_cmd_update {
808 struct kdbus_item items[0];
809 } __attribute__((aligned(8)));
812 * enum kdbus_cmd_match_flags - flags to control the KDBUS_CMD_MATCH_ADD ioctl
813 * @KDBUS_MATCH_REPLACE: If entries with the supplied cookie already
814 * exists, remove them before installing the new
817 enum kdbus_cmd_match_flags {
818 KDBUS_MATCH_REPLACE = 1ULL << 0,
822 * struct kdbus_cmd_match - struct to add or remove matches
823 * @size: The total size of the struct
824 * @cookie: Userspace supplied cookie. When removing, the cookie
825 * identifies the match to remove
826 * @flags: Flags for match command (KDBUS_MATCH_*),
828 * @kernel_flags: Supported flags of the used command, kernel → userspace
829 * @items: A list of items for additional information
831 * This structure is used with the KDBUS_CMD_MATCH_ADD and
832 * KDBUS_CMD_MATCH_REMOVE ioctl.
834 struct kdbus_cmd_match {
839 struct kdbus_item items[0];
840 } __attribute__((aligned(8)));
844 * KDBUS_CMD_BUS_MAKE: After opening the "control" node, this command
845 * creates a new bus with the specified
846 * name. The bus is immediately shut down and
847 * cleaned up when the opened file descriptor is
849 * KDBUS_CMD_ENDPOINT_MAKE: Creates a new named special endpoint to talk to
850 * the bus. Such endpoints usually carry a more
851 * restrictive policy and grant restricted access
852 * to specific applications.
853 * KDBUS_CMD_HELLO: By opening the bus node, a connection is
854 * created. After a HELLO the opened connection
855 * becomes an active peer on the bus.
856 * KDBUS_CMD_BYEBYE: Disconnect a connection. If there are no
857 * messages queued up in the connection's pool,
858 * the call succeeds, and the handle is rendered
859 * unusable. Otherwise, -EBUSY is returned without
860 * any further side-effects.
861 * KDBUS_CMD_MSG_SEND: Send a message and pass data from userspace to
863 * KDBUS_CMD_MSG_RECV: Receive a message from the kernel which is
864 * placed in the receiver's pool.
865 * KDBUS_CMD_MSG_CANCEL: Cancel a pending request of a message that
866 * blocks while waiting for a reply. The parameter
867 * denotes the cookie of the message in flight.
868 * KDBUS_CMD_FREE: Release the allocated memory in the receiver's
870 * KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
871 * the connection. Well-known names are used to
872 * address a peer on the bus.
873 * KDBUS_CMD_NAME_RELEASE: Release a well-known name the connection
875 * KDBUS_CMD_NAME_LIST: Retrieve the list of all currently registered
876 * well-known and unique names.
877 * KDBUS_CMD_CONN_INFO: Retrieve credentials and properties of the
878 * initial creator of the connection. The data was
879 * stored at registration time and does not
880 * necessarily represent the connected process or
881 * the actual state of the process.
882 * KDBUS_CMD_CONN_UPDATE: Update the properties of a connection. Used to
883 * update the metadata subscription mask and
885 * KDBUS_CMD_BUS_CREATOR_INFO: Retrieve information of the creator of the bus
886 * a connection is attached to.
887 * KDBUS_CMD_ENDPOINT_UPDATE: Update the properties of a custom enpoint. Used
888 * to update the policy.
889 * KDBUS_CMD_MATCH_ADD: Install a match which broadcast messages should
890 * be delivered to the connection.
891 * KDBUS_CMD_MATCH_REMOVE: Remove a current match for broadcast messages.
893 #define KDBUS_CMD_BUS_MAKE _IOW(KDBUS_IOCTL_MAGIC, 0x00, \
894 struct kdbus_cmd_make)
895 #define KDBUS_CMD_ENDPOINT_MAKE _IOW(KDBUS_IOCTL_MAGIC, 0x10, \
896 struct kdbus_cmd_make)
898 #define KDBUS_CMD_HELLO _IOWR(KDBUS_IOCTL_MAGIC, 0x20, \
899 struct kdbus_cmd_hello)
900 #define KDBUS_CMD_BYEBYE _IO(KDBUS_IOCTL_MAGIC, 0x21) \
902 #define KDBUS_CMD_MSG_SEND _IOWR(KDBUS_IOCTL_MAGIC, 0x30, \
904 #define KDBUS_CMD_MSG_RECV _IOWR(KDBUS_IOCTL_MAGIC, 0x31, \
905 struct kdbus_cmd_recv)
906 #define KDBUS_CMD_MSG_CANCEL _IOW(KDBUS_IOCTL_MAGIC, 0x32, \
907 struct kdbus_cmd_cancel)
908 #define KDBUS_CMD_FREE _IOW(KDBUS_IOCTL_MAGIC, 0x33, \
909 struct kdbus_cmd_free)
911 #define KDBUS_CMD_NAME_ACQUIRE _IOWR(KDBUS_IOCTL_MAGIC, 0x40, \
912 struct kdbus_cmd_name)
913 #define KDBUS_CMD_NAME_RELEASE _IOW(KDBUS_IOCTL_MAGIC, 0x41, \
914 struct kdbus_cmd_name)
915 #define KDBUS_CMD_NAME_LIST _IOWR(KDBUS_IOCTL_MAGIC, 0x42, \
916 struct kdbus_cmd_name_list)
918 #define KDBUS_CMD_CONN_INFO _IOWR(KDBUS_IOCTL_MAGIC, 0x50, \
919 struct kdbus_cmd_info)
920 #define KDBUS_CMD_CONN_UPDATE _IOW(KDBUS_IOCTL_MAGIC, 0x51, \
921 struct kdbus_cmd_update)
922 #define KDBUS_CMD_BUS_CREATOR_INFO _IOWR(KDBUS_IOCTL_MAGIC, 0x52, \
923 struct kdbus_cmd_info)
925 #define KDBUS_CMD_ENDPOINT_UPDATE _IOW(KDBUS_IOCTL_MAGIC, 0x61, \
926 struct kdbus_cmd_update)
928 #define KDBUS_CMD_MATCH_ADD _IOW(KDBUS_IOCTL_MAGIC, 0x70, \
929 struct kdbus_cmd_match)
930 #define KDBUS_CMD_MATCH_REMOVE _IOW(KDBUS_IOCTL_MAGIC, 0x71, \
931 struct kdbus_cmd_match)
933 #endif /* _KDBUS_UAPI_H_ */