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_NEGOTIATE (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 {
36 } __attribute__((__aligned__(8)));
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;
56 } __attribute__((__aligned__(8)));
59 * struct kdbus_creds - process credentials
61 * @euid: Effective UID
63 * @fsuid: Filesystem UID
65 * @egid: Effective GID
67 * @fsgid: Filesystem GID
81 } __attribute__((__aligned__(8)));
84 * struct kdbus_pids - process identifiers
87 * @ppid: Parent process ID
89 * The PID and TID of a process.
98 } __attribute__((__aligned__(8)));
101 * struct kdbus_caps - process capabilities
102 * @last_cap: Highest currently known capability bit
103 * @caps: Variable number of 32-bit capabilities flags
105 * Contains a variable number of 32-bit capabilities flags.
113 } __attribute__((__aligned__(8)));
116 * struct kdbus_audit - audit information
117 * @sessionid: The audit session ID
118 * @loginuid: The audit login uid
126 } __attribute__((__aligned__(8)));
129 * struct kdbus_timestamp
130 * @seqnum: Global per-domain message sequence number
131 * @monotonic_ns: Monotonic timestamp, in nanoseconds
132 * @realtime_ns: Realtime timestamp, in nanoseconds
135 * KDBUS_ITEM_TIMESTAMP
137 struct kdbus_timestamp {
141 } __attribute__((__aligned__(8)));
144 * struct kdbus_vec - I/O vector for kdbus payload items
145 * @size: The size of the vector
146 * @address: Memory address of data buffer
147 * @offset: Offset in the in-message payload memory,
148 * relative to the message head
151 * KDBUS_ITEM_PAYLOAD_VEC, KDBUS_ITEM_PAYLOAD_OFF
159 } __attribute__((__aligned__(8)));
162 * struct kdbus_bloom_parameter - bus-wide bloom parameters
163 * @size: Size of the bit field in bytes (m / 8)
164 * @n_hash: Number of hash functions used (k)
166 struct kdbus_bloom_parameter {
169 } __attribute__((__aligned__(8)));
172 * struct kdbus_bloom_filter - bloom filter containing n elements
173 * @generation: Generation of the element set in the filter
174 * @data: Bit field, multiple of 8 bytes
176 struct kdbus_bloom_filter {
179 } __attribute__((__aligned__(8)));
182 * struct kdbus_memfd - a kdbus memfd
183 * @start: The offset into the memfd where the segment starts
184 * @size: The size of the memfd segment
185 * @fd: The file descriptor number
186 * @__pad: Padding to ensure proper alignment and size
189 * KDBUS_ITEM_PAYLOAD_MEMFD
196 } __attribute__((__aligned__(8)));
199 * struct kdbus_name - a registered well-known name with its flags
200 * @flags: Flags from KDBUS_NAME_*
201 * @name: Well-known name
204 * KDBUS_ITEM_OWNED_NAME
209 } __attribute__((__aligned__(8)));
212 * enum kdbus_policy_access_type - permissions of a policy record
213 * @_KDBUS_POLICY_ACCESS_NULL: Uninitialized/invalid
214 * @KDBUS_POLICY_ACCESS_USER: Grant access to a uid
215 * @KDBUS_POLICY_ACCESS_GROUP: Grant access to gid
216 * @KDBUS_POLICY_ACCESS_WORLD: World-accessible
218 enum kdbus_policy_access_type {
219 _KDBUS_POLICY_ACCESS_NULL,
220 KDBUS_POLICY_ACCESS_USER,
221 KDBUS_POLICY_ACCESS_GROUP,
222 KDBUS_POLICY_ACCESS_WORLD,
226 * enum kdbus_policy_access_flags - mode flags
227 * @KDBUS_POLICY_OWN: Allow to own a well-known name
228 * Implies KDBUS_POLICY_TALK and KDBUS_POLICY_SEE
229 * @KDBUS_POLICY_TALK: Allow communication to a well-known name
230 * Implies KDBUS_POLICY_SEE
231 * @KDBUS_POLICY_SEE: Allow to see a well-known name
233 enum kdbus_policy_type {
234 KDBUS_POLICY_SEE = 0,
240 * struct kdbus_policy_access - policy access item
241 * @type: One of KDBUS_POLICY_ACCESS_* types
242 * @access: Access to grant
243 * @id: For KDBUS_POLICY_ACCESS_USER, the uid
244 * For KDBUS_POLICY_ACCESS_GROUP, the gid
246 struct kdbus_policy_access {
247 __u64 type; /* USER, GROUP, WORLD */
248 __u64 access; /* OWN, TALK, SEE */
249 __u64 id; /* uid, gid, 0 */
250 } __attribute__((__aligned__(8)));
253 * enum kdbus_attach_flags - flags for metadata attachments
254 * @KDBUS_ATTACH_TIMESTAMP: Timestamp
255 * @KDBUS_ATTACH_CREDS: Credentials
256 * @KDBUS_ATTACH_PIDS: PIDs
257 * @KDBUS_ATTACH_AUXGROUPS: Auxiliary groups
258 * @KDBUS_ATTACH_NAMES: Well-known names
259 * @KDBUS_ATTACH_TID_COMM: The "comm" process identifier of the TID
260 * @KDBUS_ATTACH_PID_COMM: The "comm" process identifier of the PID
261 * @KDBUS_ATTACH_EXE: The path of the executable
262 * @KDBUS_ATTACH_CMDLINE: The process command line
263 * @KDBUS_ATTACH_CGROUP: The croup membership
264 * @KDBUS_ATTACH_CAPS: The process capabilities
265 * @KDBUS_ATTACH_SECLABEL: The security label
266 * @KDBUS_ATTACH_AUDIT: The audit IDs
267 * @KDBUS_ATTACH_CONN_DESCRIPTION: The human-readable connection name
268 * @_KDBUS_ATTACH_ALL: All of the above
269 * @_KDBUS_ATTACH_ANY: Wildcard match to enable any kind of
272 enum kdbus_attach_flags {
273 KDBUS_ATTACH_TIMESTAMP = 1ULL << 0,
274 KDBUS_ATTACH_CREDS = 1ULL << 1,
275 KDBUS_ATTACH_PIDS = 1ULL << 2,
276 KDBUS_ATTACH_AUXGROUPS = 1ULL << 3,
277 KDBUS_ATTACH_NAMES = 1ULL << 4,
278 KDBUS_ATTACH_TID_COMM = 1ULL << 5,
279 KDBUS_ATTACH_PID_COMM = 1ULL << 6,
280 KDBUS_ATTACH_EXE = 1ULL << 7,
281 KDBUS_ATTACH_CMDLINE = 1ULL << 8,
282 KDBUS_ATTACH_CGROUP = 1ULL << 9,
283 KDBUS_ATTACH_CAPS = 1ULL << 10,
284 KDBUS_ATTACH_SECLABEL = 1ULL << 11,
285 KDBUS_ATTACH_AUDIT = 1ULL << 12,
286 KDBUS_ATTACH_CONN_DESCRIPTION = 1ULL << 13,
287 _KDBUS_ATTACH_ALL = (1ULL << 14) - 1,
288 _KDBUS_ATTACH_ANY = ~0ULL
292 * enum kdbus_item_type - item types to chain data in a list
293 * @_KDBUS_ITEM_NULL: Uninitialized/invalid
294 * @_KDBUS_ITEM_USER_BASE: Start of user items
295 * @KDBUS_ITEM_NEGOTIATE: Negotiate supported items
296 * @KDBUS_ITEM_PAYLOAD_VEC: Vector to data
297 * @KDBUS_ITEM_PAYLOAD_OFF: Data at returned offset to message head
298 * @KDBUS_ITEM_PAYLOAD_MEMFD: Data as sealed memfd
299 * @KDBUS_ITEM_FDS: Attached file descriptors
300 * @KDBUS_ITEM_CANCEL_FD: FD used to cancel a synchronous
301 * operation by writing to it from
303 * @KDBUS_ITEM_BLOOM_PARAMETER: Bus-wide bloom parameters, used with
304 * KDBUS_CMD_BUS_MAKE, carries a
305 * struct kdbus_bloom_parameter
306 * @KDBUS_ITEM_BLOOM_FILTER: Bloom filter carried with a message,
307 * used to match against a bloom mask of a
308 * connection, carries a struct
310 * @KDBUS_ITEM_BLOOM_MASK: Bloom mask used to match against a
311 * message'sbloom filter
312 * @KDBUS_ITEM_DST_NAME: Destination's well-known name
313 * @KDBUS_ITEM_MAKE_NAME: Name of domain, bus, endpoint
314 * @KDBUS_ITEM_ATTACH_FLAGS_SEND: Attach-flags, used for updating which
315 * metadata a connection opts in to send
316 * @KDBUS_ITEM_ATTACH_FLAGS_RECV: Attach-flags, used for updating which
317 * metadata a connection requests to
318 * receive for each reeceived message
319 * @KDBUS_ITEM_ID: Connection ID
320 * @KDBUS_ITEM_NAME: Well-know name with flags
321 * @_KDBUS_ITEM_ATTACH_BASE: Start of metadata attach items
322 * @KDBUS_ITEM_TIMESTAMP: Timestamp
323 * @KDBUS_ITEM_CREDS: Process credentials
324 * @KDBUS_ITEM_PIDS: Process identifiers
325 * @KDBUS_ITEM_AUXGROUPS: Auxiliary process groups
326 * @KDBUS_ITEM_OWNED_NAME: A name owned by the associated
328 * @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier
329 * (Don't trust this, see below.)
330 * @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier
331 * (Don't trust this, see below.)
332 * @KDBUS_ITEM_EXE: The path of the executable
333 * (Don't trust this, see below.)
334 * @KDBUS_ITEM_CMDLINE: The process command line
335 * (Don't trust this, see below.)
336 * @KDBUS_ITEM_CGROUP: The croup membership
337 * @KDBUS_ITEM_CAPS: The process capabilities
338 * @KDBUS_ITEM_SECLABEL: The security label
339 * @KDBUS_ITEM_AUDIT: The audit IDs
340 * @KDBUS_ITEM_CONN_DESCRIPTION: The connection's human-readable name
342 * @_KDBUS_ITEM_POLICY_BASE: Start of policy items
343 * @KDBUS_ITEM_POLICY_ACCESS: Policy access block
344 * @_KDBUS_ITEM_KERNEL_BASE: Start of kernel-generated message items
345 * @KDBUS_ITEM_NAME_ADD: Notification in kdbus_notify_name_change
346 * @KDBUS_ITEM_NAME_REMOVE: Notification in kdbus_notify_name_change
347 * @KDBUS_ITEM_NAME_CHANGE: Notification in kdbus_notify_name_change
348 * @KDBUS_ITEM_ID_ADD: Notification in kdbus_notify_id_change
349 * @KDBUS_ITEM_ID_REMOVE: Notification in kdbus_notify_id_change
350 * @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached
351 * @KDBUS_ITEM_REPLY_DEAD: Destination died
353 * N.B: The process and thread COMM fields, as well as the CMDLINE and
354 * EXE fields may be altered by unprivileged processes und should
355 * hence *not* used for security decisions. Peers should make use of
356 * these items only for informational purposes, such as generating log
359 enum kdbus_item_type {
361 _KDBUS_ITEM_USER_BASE,
362 KDBUS_ITEM_NEGOTIATE = _KDBUS_ITEM_USER_BASE,
363 KDBUS_ITEM_PAYLOAD_VEC,
364 KDBUS_ITEM_PAYLOAD_OFF,
365 KDBUS_ITEM_PAYLOAD_MEMFD,
367 KDBUS_ITEM_CANCEL_FD,
368 KDBUS_ITEM_BLOOM_PARAMETER,
369 KDBUS_ITEM_BLOOM_FILTER,
370 KDBUS_ITEM_BLOOM_MASK,
372 KDBUS_ITEM_MAKE_NAME,
373 KDBUS_ITEM_ATTACH_FLAGS_SEND,
374 KDBUS_ITEM_ATTACH_FLAGS_RECV,
378 /* keep these item types in sync with KDBUS_ATTACH_* flags */
379 _KDBUS_ITEM_ATTACH_BASE = 0x1000,
380 KDBUS_ITEM_TIMESTAMP = _KDBUS_ITEM_ATTACH_BASE,
383 KDBUS_ITEM_AUXGROUPS,
384 KDBUS_ITEM_OWNED_NAME,
393 KDBUS_ITEM_CONN_DESCRIPTION,
395 _KDBUS_ITEM_POLICY_BASE = 0x2000,
396 KDBUS_ITEM_POLICY_ACCESS = _KDBUS_ITEM_POLICY_BASE,
398 _KDBUS_ITEM_KERNEL_BASE = 0x8000,
399 KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
400 KDBUS_ITEM_NAME_REMOVE,
401 KDBUS_ITEM_NAME_CHANGE,
403 KDBUS_ITEM_ID_REMOVE,
404 KDBUS_ITEM_REPLY_TIMEOUT,
405 KDBUS_ITEM_REPLY_DEAD,
409 * struct kdbus_item - chain of data blocks
410 * @size: Overall data record size
411 * @type: Kdbus_item type of data
412 * @data: Generic bytes
413 * @data32: Generic 32 bit array
414 * @data64: Generic 64 bit array
415 * @str: Generic string
417 * @vec: KDBUS_ITEM_PAYLOAD_VEC
418 * @creds: KDBUS_ITEM_CREDS
419 * @audit: KDBUS_ITEM_AUDIT
420 * @timestamp: KDBUS_ITEM_TIMESTAMP
421 * @name: KDBUS_ITEM_NAME
422 * @bloom_parameter: KDBUS_ITEM_BLOOM_PARAMETER
423 * @bloom_filter: KDBUS_ITEM_BLOOM_FILTER
424 * @memfd: KDBUS_ITEM_PAYLOAD_MEMFD
425 * @name_change: KDBUS_ITEM_NAME_ADD
426 * KDBUS_ITEM_NAME_REMOVE
427 * KDBUS_ITEM_NAME_CHANGE
428 * @id_change: KDBUS_ITEM_ID_ADD
429 * KDBUS_ITEM_ID_REMOVE
430 * @policy: KDBUS_ITEM_POLICY_ACCESS
442 struct kdbus_vec vec;
443 struct kdbus_creds creds;
444 struct kdbus_pids pids;
445 struct kdbus_audit audit;
446 struct kdbus_caps caps;
447 struct kdbus_timestamp timestamp;
448 struct kdbus_name name;
449 struct kdbus_bloom_parameter bloom_parameter;
450 struct kdbus_bloom_filter bloom_filter;
451 struct kdbus_memfd memfd;
453 struct kdbus_notify_name_change name_change;
454 struct kdbus_notify_id_change id_change;
455 struct kdbus_policy_access policy_access;
457 } __attribute__((__aligned__(8)));
460 * struct kdbus_item_list - A list of items
461 * @size: The total size of the structure
462 * @items: Array of items
464 struct kdbus_item_list {
466 struct kdbus_item items[0];
467 } __attribute__((__aligned__(8)));
470 * enum kdbus_msg_flags - type of message
471 * @KDBUS_MSG_EXPECT_REPLY: Expect a reply message, used for
472 * method calls. The userspace-supplied
473 * cookie identifies the message and the
474 * respective reply carries the cookie
476 * @KDBUS_MSG_NO_AUTO_START: Do not start a service, if the addressed
477 * name is not currently active
478 * @KDBUS_MSG_SIGNAL: Treat this message as signal
480 enum kdbus_msg_flags {
481 KDBUS_MSG_EXPECT_REPLY = 1ULL << 0,
482 KDBUS_MSG_NO_AUTO_START = 1ULL << 1,
483 KDBUS_MSG_SIGNAL = 1ULL << 2,
487 * enum kdbus_payload_type - type of payload carried by message
488 * @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message
489 * @KDBUS_PAYLOAD_DBUS: D-Bus marshalling "DBusDBus"
491 * Any payload-type is accepted. Common types will get added here once
494 enum kdbus_payload_type {
495 KDBUS_PAYLOAD_KERNEL,
496 KDBUS_PAYLOAD_DBUS = 0x4442757344427573ULL,
500 * struct kdbus_msg - the representation of a kdbus message
501 * @size: Total size of the message
502 * @flags: Message flags (KDBUS_MSG_*), userspace → kernel
503 * @priority: Message queue priority value
504 * @dst_id: 64-bit ID of the destination connection
505 * @src_id: 64-bit ID of the source connection
506 * @payload_type: Payload type (KDBUS_PAYLOAD_*)
507 * @cookie: Userspace-supplied cookie, for the connection
508 * to identify its messages
509 * @timeout_ns: The time to wait for a message reply from the peer.
510 * If there is no reply, a kernel-generated message
511 * with an attached KDBUS_ITEM_REPLY_TIMEOUT item
512 * is sent to @src_id. The timeout is expected in
513 * nanoseconds and as absolute CLOCK_MONOTONIC value.
514 * @cookie_reply: A reply to the requesting message with the same
515 * cookie. The requesting connection can match its
516 * request and the reply with this value
517 * @items: A list of kdbus_items containing the message payload
531 struct kdbus_item items[0];
532 } __attribute__((__aligned__(8)));
535 * struct kdbus_msg_info - returned message container
536 * @offset: Offset of kdbus_msg slice in pool
537 * @msg_size: Copy of the kdbus_msg.size field
538 * @return_flags: Command return flags, kernel → userspace
540 struct kdbus_msg_info {
544 } __attribute__((__aligned__(8)));
547 * enum kdbus_send_flags - flags for sending messages
548 * @KDBUS_SEND_SYNC_REPLY: Wait for destination connection to
549 * reply to this message. The
550 * KDBUS_CMD_SEND ioctl() will block
551 * until the reply is received, and
552 * offset_reply in struct kdbus_msg will
553 * yield the offset in the sender's pool
554 * where the reply can be found.
555 * This flag is only valid if
556 * @KDBUS_MSG_EXPECT_REPLY is set as well.
558 enum kdbus_send_flags {
559 KDBUS_SEND_SYNC_REPLY = 1ULL << 0,
563 * struct kdbus_cmd_send - send message
564 * @size: Overall size of this structure
565 * @flags: Flags to change send behavior (KDBUS_SEND_*)
566 * @return_flags: Command return flags, kernel → userspace
567 * @msg_address: Storage address of the kdbus_msg to send
568 * @reply: Storage for message reply if KDBUS_SEND_SYNC_REPLY
570 * @items: Additional items for this command
572 struct kdbus_cmd_send {
577 struct kdbus_msg_info reply;
578 struct kdbus_item items[0];
579 } __attribute__((__aligned__(8)));
582 * enum kdbus_recv_flags - flags for de-queuing messages
583 * @KDBUS_RECV_PEEK: Return the next queued message without
584 * actually de-queuing it, and without installing
585 * any file descriptors or other resources. It is
586 * usually used to determine the activating
587 * connection of a bus name.
588 * @KDBUS_RECV_DROP: Drop and free the next queued message and all
589 * its resources without actually receiving it.
590 * @KDBUS_RECV_USE_PRIORITY: Only de-queue messages with the specified or
591 * higher priority (lowest values); if not set,
592 * the priority value is ignored.
594 enum kdbus_recv_flags {
595 KDBUS_RECV_PEEK = 1ULL << 0,
596 KDBUS_RECV_DROP = 1ULL << 1,
597 KDBUS_RECV_USE_PRIORITY = 1ULL << 2,
601 * enum kdbus_recv_return_flags - return flags for message receive commands
602 * @KDBUS_RECV_RETURN_INCOMPLETE_FDS: One or more file descriptors could not
603 * be installed. These descriptors in
604 * KDBUS_ITEM_FDS will carry the value -1.
605 * @KDBUS_RECV_RETURN_DROPPED_MSGS: There have been dropped messages since
606 * the last time a message was received.
607 * The 'dropped_msgs' counter contains the
608 * number of messages dropped pool
609 * overflows or other missed broadcasts.
611 enum kdbus_recv_return_flags {
612 KDBUS_RECV_RETURN_INCOMPLETE_FDS = 1ULL << 0,
613 KDBUS_RECV_RETURN_DROPPED_MSGS = 1ULL << 1,
617 * struct kdbus_cmd_recv - struct to de-queue a buffered message
618 * @size: Overall size of this object
619 * @flags: KDBUS_RECV_* flags, userspace → kernel
620 * @return_flags: Command return flags, kernel → userspace
621 * @priority: Minimum priority of the messages to de-queue. Lowest
622 * values have the highest priority.
623 * @dropped_msgs: In case there were any dropped messages since the last
624 * time a message was received, this will be set to the
625 * number of lost messages and
626 * KDBUS_RECV_RETURN_DROPPED_MSGS will be set in
627 * 'return_flags'. This can only happen if the ioctl
628 * returns 0 or EAGAIN.
629 * @msg: Return storage for received message.
630 * @items: Additional items for this command.
632 * This struct is used with the KDBUS_CMD_RECV ioctl.
634 struct kdbus_cmd_recv {
640 struct kdbus_msg_info msg;
641 struct kdbus_item items[0];
642 } __attribute__((__aligned__(8)));
645 * struct kdbus_cmd_free - struct to free a slice of memory in the pool
646 * @size: Overall size of this structure
647 * @flags: Flags for the free command, userspace → kernel
648 * @return_flags: Command return flags, kernel → userspace
649 * @offset: The offset of the memory slice, as returned by other
651 * @items: Additional items to modify the behavior
653 * This struct is used with the KDBUS_CMD_FREE ioctl.
655 struct kdbus_cmd_free {
660 struct kdbus_item items[0];
661 } __attribute__((__aligned__(8)));
664 * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello
665 * @KDBUS_HELLO_ACCEPT_FD: The connection allows the reception of
666 * any passed file descriptors
667 * @KDBUS_HELLO_ACTIVATOR: Special-purpose connection which registers
668 * a well-know name for a process to be started
669 * when traffic arrives
670 * @KDBUS_HELLO_POLICY_HOLDER: Special-purpose connection which registers
671 * policy entries for a name. The provided name
672 * is not activated and not registered with the
673 * name database, it only allows unprivileged
674 * connections to acquire a name, talk or discover
676 * @KDBUS_HELLO_MONITOR: Special-purpose connection to monitor
679 enum kdbus_hello_flags {
680 KDBUS_HELLO_ACCEPT_FD = 1ULL << 0,
681 KDBUS_HELLO_ACTIVATOR = 1ULL << 1,
682 KDBUS_HELLO_POLICY_HOLDER = 1ULL << 2,
683 KDBUS_HELLO_MONITOR = 1ULL << 3,
687 * struct kdbus_cmd_hello - struct to say hello to kdbus
688 * @size: The total size of the structure
689 * @flags: Connection flags (KDBUS_HELLO_*), userspace → kernel
690 * @return_flags: Command return flags, kernel → userspace
691 * @attach_flags_send: Mask of metadata to attach to each message sent
692 * off by this connection (KDBUS_ATTACH_*)
693 * @attach_flags_recv: Mask of metadata to attach to each message receieved
694 * by the new connection (KDBUS_ATTACH_*)
695 * @bus_flags: The flags field copied verbatim from the original
696 * KDBUS_CMD_BUS_MAKE ioctl. It's intended to be useful
697 * to do negotiation of features of the payload that is
698 * transferred (kernel → userspace)
699 * @id: The ID of this connection (kernel → userspace)
700 * @pool_size: Size of the connection's buffer where the received
701 * messages are placed
702 * @offset: Pool offset where additional items of type
703 * kdbus_item_list are stored. They contain information
704 * about the bus and the newly created connection.
705 * @items_size: Copy of item_list.size stored in @offset.
706 * @id128: Unique 128-bit ID of the bus (kernel → userspace)
707 * @items: A list of items
709 * This struct is used with the KDBUS_CMD_HELLO ioctl.
711 struct kdbus_cmd_hello {
715 __u64 attach_flags_send;
716 __u64 attach_flags_recv;
723 struct kdbus_item items[0];
724 } __attribute__((__aligned__(8)));
727 * struct kdbus_info - connection information
728 * @size: total size of the struct
729 * @id: 64bit object ID
730 * @flags: object creation flags
731 * @items: list of items
733 * Note that the user is responsible for freeing the allocated memory with
734 * the KDBUS_CMD_FREE ioctl.
740 struct kdbus_item items[0];
741 } __attribute__((__aligned__(8)));
744 * enum kdbus_list_flags - what to include into the returned list
745 * @KDBUS_LIST_UNIQUE: active connections
746 * @KDBUS_LIST_ACTIVATORS: activator connections
747 * @KDBUS_LIST_NAMES: known well-known names
748 * @KDBUS_LIST_QUEUED: queued-up names
750 enum kdbus_list_flags {
751 KDBUS_LIST_UNIQUE = 1ULL << 0,
752 KDBUS_LIST_NAMES = 1ULL << 1,
753 KDBUS_LIST_ACTIVATORS = 1ULL << 2,
754 KDBUS_LIST_QUEUED = 1ULL << 3,
758 * struct kdbus_cmd_list - list connections
759 * @size: overall size of this object
760 * @flags: flags for the query (KDBUS_LIST_*), userspace → kernel
761 * @return_flags: command return flags, kernel → userspace
762 * @offset: Offset in the caller's pool buffer where an array of
763 * kdbus_info objects is stored.
764 * The user must use KDBUS_CMD_FREE to free the
766 * @list_size: size of returned list in bytes
767 * @items: Items for the command. Reserved for future use.
769 * This structure is used with the KDBUS_CMD_LIST ioctl.
771 struct kdbus_cmd_list {
777 struct kdbus_item items[0];
778 } __attribute__((__aligned__(8)));
781 * struct kdbus_cmd_info - struct used for KDBUS_CMD_CONN_INFO ioctl
782 * @size: The total size of the struct
783 * @flags: Flags for this ioctl, userspace → kernel
784 * @return_flags: Command return flags, kernel → userspace
785 * @id: The 64-bit ID of the connection. If set to zero, passing
786 * @name is required. kdbus will look up the name to
787 * determine the ID in this case.
788 * @attach_flags: Set of attach flags to specify the set of information
789 * to receive, userspace → kernel
790 * @offset: Returned offset in the caller's pool buffer where the
791 * kdbus_info struct result is stored. The user must
792 * use KDBUS_CMD_FREE to free the allocated memory.
793 * @info_size: Output buffer to report size of data at @offset.
794 * @items: The optional item list, containing the
795 * well-known name to look up as a KDBUS_ITEM_NAME.
796 * Only needed in case @id is zero.
798 * On success, the KDBUS_CMD_CONN_INFO ioctl will return 0 and @offset will
799 * tell the user the offset in the connection pool buffer at which to find the
800 * result in a struct kdbus_info.
802 struct kdbus_cmd_info {
810 struct kdbus_item items[0];
811 } __attribute__((__aligned__(8)));
814 * enum kdbus_cmd_match_flags - flags to control the KDBUS_CMD_MATCH_ADD ioctl
815 * @KDBUS_MATCH_REPLACE: If entries with the supplied cookie already
816 * exists, remove them before installing the new
819 enum kdbus_cmd_match_flags {
820 KDBUS_MATCH_REPLACE = 1ULL << 0,
824 * struct kdbus_cmd_match - struct to add or remove matches
825 * @size: The total size of the struct
826 * @flags: Flags for match command (KDBUS_MATCH_*),
828 * @return_flags: Command return flags, kernel → userspace
829 * @cookie: Userspace supplied cookie. When removing, the cookie
830 * identifies the match to remove
831 * @items: A list of items for additional information
833 * This structure is used with the KDBUS_CMD_MATCH_ADD and
834 * KDBUS_CMD_MATCH_REMOVE ioctl.
836 struct kdbus_cmd_match {
841 struct kdbus_item items[0];
842 } __attribute__((__aligned__(8)));
845 * enum kdbus_make_flags - Flags for KDBUS_CMD_{BUS,ENDPOINT}_MAKE
846 * @KDBUS_MAKE_ACCESS_GROUP: Make the bus or endpoint node group-accessible
847 * @KDBUS_MAKE_ACCESS_WORLD: Make the bus or endpoint node world-accessible
849 enum kdbus_make_flags {
850 KDBUS_MAKE_ACCESS_GROUP = 1ULL << 0,
851 KDBUS_MAKE_ACCESS_WORLD = 1ULL << 1,
855 * enum kdbus_name_flags - flags for KDBUS_CMD_NAME_ACQUIRE
856 * @KDBUS_NAME_REPLACE_EXISTING: Try to replace name of other connections
857 * @KDBUS_NAME_ALLOW_REPLACEMENT: Allow the replacement of the name
858 * @KDBUS_NAME_QUEUE: Name should be queued if busy
859 * @KDBUS_NAME_IN_QUEUE: Name is queued
860 * @KDBUS_NAME_ACTIVATOR: Name is owned by a activator connection
862 enum kdbus_name_flags {
863 KDBUS_NAME_REPLACE_EXISTING = 1ULL << 0,
864 KDBUS_NAME_ALLOW_REPLACEMENT = 1ULL << 1,
865 KDBUS_NAME_QUEUE = 1ULL << 2,
866 KDBUS_NAME_IN_QUEUE = 1ULL << 3,
867 KDBUS_NAME_ACTIVATOR = 1ULL << 4,
871 * struct kdbus_cmd - generic ioctl payload
872 * @size: Overall size of this structure
873 * @flags: Flags for this ioctl, userspace → kernel
874 * @return_flags: Ioctl return flags, kernel → userspace
875 * @items: Additional items to modify the behavior
877 * This is a generic ioctl payload object. It's used by all ioctls that only
878 * take flags and items as input.
884 struct kdbus_item items[0];
885 } __attribute__((__aligned__(8)));
890 * KDBUS_CMD_BUS_MAKE: After opening the "control" node, this command
891 * creates a new bus with the specified
892 * name. The bus is immediately shut down and
893 * cleaned up when the opened file descriptor is
896 * KDBUS_CMD_ENDPOINT_MAKE: Creates a new named special endpoint to talk to
897 * the bus. Such endpoints usually carry a more
898 * restrictive policy and grant restricted access
899 * to specific applications.
900 * KDBUS_CMD_ENDPOINT_UPDATE: Update the properties of a custom enpoint. Used
901 * to update the policy.
903 * KDBUS_CMD_HELLO: By opening the bus node, a connection is
904 * created. After a HELLO the opened connection
905 * becomes an active peer on the bus.
906 * KDBUS_CMD_UPDATE: Update the properties of a connection. Used to
907 * update the metadata subscription mask and
909 * KDBUS_CMD_BYEBYE: Disconnect a connection. If there are no
910 * messages queued up in the connection's pool,
911 * the call succeeds, and the handle is rendered
912 * unusable. Otherwise, -EBUSY is returned without
913 * any further side-effects.
914 * KDBUS_CMD_FREE: Release the allocated memory in the receiver's
916 * KDBUS_CMD_CONN_INFO: Retrieve credentials and properties of the
917 * initial creator of the connection. The data was
918 * stored at registration time and does not
919 * necessarily represent the connected process or
920 * the actual state of the process.
921 * KDBUS_CMD_BUS_CREATOR_INFO: Retrieve information of the creator of the bus
922 * a connection is attached to.
924 * KDBUS_CMD_SEND: Send a message and pass data from userspace to
926 * KDBUS_CMD_RECV: Receive a message from the kernel which is
927 * placed in the receiver's pool.
929 * KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
930 * the connection. Well-known names are used to
931 * address a peer on the bus.
932 * KDBUS_CMD_NAME_RELEASE: Release a well-known name the connection
934 * KDBUS_CMD_LIST: Retrieve the list of all currently registered
935 * well-known and unique names.
937 * KDBUS_CMD_MATCH_ADD: Install a match which broadcast messages should
938 * be delivered to the connection.
939 * KDBUS_CMD_MATCH_REMOVE: Remove a current match for broadcast messages.
941 enum kdbus_ioctl_type {
942 /* bus owner (00-0f) */
943 KDBUS_CMD_BUS_MAKE = _IOW(KDBUS_IOCTL_MAGIC, 0x00,
946 /* endpoint owner (10-1f) */
947 KDBUS_CMD_ENDPOINT_MAKE = _IOW(KDBUS_IOCTL_MAGIC, 0x10,
949 KDBUS_CMD_ENDPOINT_UPDATE = _IOW(KDBUS_IOCTL_MAGIC, 0x11,
952 /* connection owner (80-ff) */
953 KDBUS_CMD_HELLO = _IOWR(KDBUS_IOCTL_MAGIC, 0x80,
954 struct kdbus_cmd_hello),
955 KDBUS_CMD_UPDATE = _IOW(KDBUS_IOCTL_MAGIC, 0x81,
957 KDBUS_CMD_BYEBYE = _IOW(KDBUS_IOCTL_MAGIC, 0x82,
959 KDBUS_CMD_FREE = _IOW(KDBUS_IOCTL_MAGIC, 0x83,
960 struct kdbus_cmd_free),
961 KDBUS_CMD_CONN_INFO = _IOR(KDBUS_IOCTL_MAGIC, 0x84,
962 struct kdbus_cmd_info),
963 KDBUS_CMD_BUS_CREATOR_INFO = _IOR(KDBUS_IOCTL_MAGIC, 0x85,
964 struct kdbus_cmd_info),
965 KDBUS_CMD_LIST = _IOR(KDBUS_IOCTL_MAGIC, 0x86,
966 struct kdbus_cmd_list),
968 KDBUS_CMD_SEND = _IOW(KDBUS_IOCTL_MAGIC, 0x90,
969 struct kdbus_cmd_send),
970 KDBUS_CMD_RECV = _IOR(KDBUS_IOCTL_MAGIC, 0x91,
971 struct kdbus_cmd_recv),
973 KDBUS_CMD_NAME_ACQUIRE = _IOW(KDBUS_IOCTL_MAGIC, 0xa0,
975 KDBUS_CMD_NAME_RELEASE = _IOW(KDBUS_IOCTL_MAGIC, 0xa1,
978 KDBUS_CMD_MATCH_ADD = _IOW(KDBUS_IOCTL_MAGIC, 0xb0,
979 struct kdbus_cmd_match),
980 KDBUS_CMD_MATCH_REMOVE = _IOW(KDBUS_IOCTL_MAGIC, 0xb1,
981 struct kdbus_cmd_match),
984 #endif /* _KDBUS_UAPI_H_ */