2 * Copyright (C) 2013 Kay Sievers
3 * Copyright (C) 2013 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 * Copyright (C) 2013 Linux Foundation
5 * Copyright (C) 2013 Lennart Poettering
6 * Copyright (C) 2013 Daniel Mack <daniel@zonque.org>
8 * kdbus is free software; you can redistribute it and/or modify it under
9 * the terms of the GNU Lesser General Public License as published by the
10 * Free Software Foundation; either version 2.1 of the License, or (at
11 * your option) any later version.
18 #include <sys/ioctl.h>
19 #include <sys/types.h>
20 #include <linux/types.h>
23 #define KDBUS_IOC_MAGIC 0x95
24 #define KDBUS_SRC_ID_KERNEL (0)
25 #define KDBUS_DST_ID_NAME (0)
26 #define KDBUS_MATCH_ID_ANY (~0ULL)
27 #define KDBUS_DST_ID_BROADCAST (~0ULL)
30 * struct kdbus_notify_id_change - name registry change message
31 * @id: New or former owner of the name
32 * @flags: flags field from KDBUS_HELLO_*
34 * Sent from kernel to userspace when the owner or activator of
35 * a well-known name changes.
39 * KDBUS_ITEM_ID_REMOVE
41 struct kdbus_notify_id_change {
47 * struct kdbus_notify_name_change - name registry change message
48 * @old: ID and flags of former owner of a name
49 * @new: ID and flags of new owner of a name
50 * @name: Well-known name
52 * Sent from kernel to userspace when the owner or activator of
53 * a well-known name changes.
57 * KDBUS_ITEM_NAME_REMOVE
58 * KDBUS_ITEM_NAME_CHANGE
60 struct kdbus_notify_name_change {
61 struct kdbus_notify_id_change old;
62 struct kdbus_notify_id_change new;
67 * struct kdbus_creds - process credentials
72 * @starttime: Starttime of the process
74 * The starttime of the process PID. This is useful to detect PID overruns
75 * from the client side. i.e. if you use the PID to look something up in
76 * /proc/$PID/ you can afterwards check the starttime field of it, to ensure
77 * you didn't run into a PID overrun.
91 * struct kdbus_audit - audit information
92 * @sessionid: The audit session ID
93 * @loginuid: The audit login uid
104 * struct kdbus_timestamp
105 * @seqnum: Global per-namespace message sequence number
106 * @monotonic_ns: Monotonic timestamp, in nanoseconds
107 * @realtime_ns: Realtime timestamp, in nanoseconds
110 * KDBUS_ITEM_TIMESTAMP
112 struct kdbus_timestamp {
119 * struct kdbus_vec - I/O vector for kdbus payload items
120 * @size: The size of the vector
121 * @address: Memory address for memory addresses
122 * @offset: Offset in the in-message payload memory,
123 * relative to the message head
126 * KDBUS_ITEM_PAYLOAD_VEC
137 * struct kdbus_memfd - a kdbus memfd
138 * @size: The memfd's size
139 * @fd: The file descriptor number
140 * @__pad: Padding to ensure proper alignement and size
143 * KDBUS_ITEM_PAYLOAD_MEMFD
152 * struct kdbus_name - a registered well-known name with its flags
153 * @flags: flags from KDBUS_NAME_*
154 * @name: well-known name
165 * struct kdbus_policy_access - policy access item
166 * @type: One of KDBUS_POLICY_ACCESS_* types
167 * @bits: Access to grant. One of KDBUS_POLICY_*
168 * @id: For KDBUS_POLICY_ACCESS_USER, the uid
169 * For KDBUS_POLICY_ACCESS_GROUP, the gid
172 * struct kdbus_policy
174 struct kdbus_policy_access {
175 __u64 type; /* USER, GROUP, WORLD */
176 __u64 bits; /* RECV, SEND, OWN */
177 __u64 id; /* uid, gid, 0 */
181 * struct kdbus_policy - a policy item
182 * @access: Policy access details
183 * @name: Well-known name to grant access to
186 * KDBUS_POLICY_ACCESS
187 * KDBUS_ITEM_POLICY_NAME
189 struct kdbus_policy {
191 struct kdbus_policy_access access;
197 * enum kdbus_item_type - item types to chain data in a list
198 * @_KDBUS_ITEM_NULL: Uninitialized/invalid
199 * @_KDBUS_ITEM_USER_BASE: Start of user items
200 * @KDBUS_ITEM_PAYLOAD_VEC: Vector to data
201 * @KDBUS_ITEM_PAYLOAD_OFF: Data at returned offset to message head
202 * @KDBUS_ITEM_PAYLOAD_MEMFD: Data as sealed memfd
203 * @KDBUS_ITEM_FDS: Attached file descriptors
204 * @KDBUS_ITEM_BLOOM: For broadcasts, carries bloom filter
205 * @KDBUS_ITEM_BLOOM_SIZE: Desired bloom size, used by KDBUS_CMD_BUS_MAKE
206 * @KDBUS_ITEM_DST_NAME: Destination's well-known name
207 * @KDBUS_ITEM_MAKE_NAME: Name of namespace, bus, endpoint
208 * @KDBUS_ITEM_MEMFD_NAME: The human readable name of a memfd (debugging)
209 * @_KDBUS_ITEM_POLICY_BASE: Start of policy items
210 * @KDBUS_ITEM_POLICY_NAME: Policy in struct kdbus_policy
211 * @KDBUS_ITEM_POLICY_ACCESS: Policy in struct kdbus_policy
212 * @_KDBUS_ITEM_ATTACH_BASE: Start of metadata attach items
213 * @KDBUS_ITEM_NAME: Well-know name with flags
214 * @KDBUS_ITEM_ID: Connection ID
215 * @KDBUS_ITEM_TIMESTAMP: Timestamp
216 * @KDBUS_ITEM_CREDS: Process credential
217 * @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier
218 * @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier
219 * @KDBUS_ITEM_EXE: The path of the executable
220 * @KDBUS_ITEM_CMDLINE: The process command line
221 * @KDBUS_ITEM_CGROUP: The croup membership
222 * @KDBUS_ITEM_CAPS: The process capabilities
223 * @KDBUS_ITEM_SECLABEL: The security label
224 * @KDBUS_ITEM_AUDIT: The audit IDs
225 * @KDBUS_ITEM_CONN_NAME: The connection's human-readable name (debugging)
226 * @_KDBUS_ITEM_KERNEL_BASE: Start of kernel-generated message items
227 * @KDBUS_ITEM_NAME_ADD: Notify in struct kdbus_notify_name_change
228 * @KDBUS_ITEM_NAME_REMOVE: Notify in struct kdbus_notify_name_change
229 * @KDBUS_ITEM_NAME_CHANGE: Notify in struct kdbus_notify_name_change
230 * @KDBUS_ITEM_ID_ADD: Notify in struct kdbus_notify_id_change
231 * @KDBUS_ITEM_ID_REMOVE: Notify in struct kdbus_notify_id_change
232 * @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached
233 * @KDBUS_ITEM_REPLY_DEAD: Destination died
235 enum kdbus_item_type {
237 _KDBUS_ITEM_USER_BASE,
238 KDBUS_ITEM_PAYLOAD_VEC = _KDBUS_ITEM_USER_BASE,
239 KDBUS_ITEM_PAYLOAD_OFF,
240 KDBUS_ITEM_PAYLOAD_MEMFD,
243 KDBUS_ITEM_BLOOM_SIZE,
245 KDBUS_ITEM_MAKE_NAME,
246 KDBUS_ITEM_MEMFD_NAME,
248 _KDBUS_ITEM_POLICY_BASE = 0x1000,
249 KDBUS_ITEM_POLICY_NAME = _KDBUS_ITEM_POLICY_BASE,
250 KDBUS_ITEM_POLICY_ACCESS,
252 _KDBUS_ITEM_ATTACH_BASE = 0x2000,
253 KDBUS_ITEM_NAME = _KDBUS_ITEM_ATTACH_BASE,
255 KDBUS_ITEM_TIMESTAMP,
265 KDBUS_ITEM_CONN_NAME,
267 _KDBUS_ITEM_KERNEL_BASE = 0x3000,
268 KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
269 KDBUS_ITEM_NAME_REMOVE,
270 KDBUS_ITEM_NAME_CHANGE,
272 KDBUS_ITEM_ID_REMOVE,
273 KDBUS_ITEM_REPLY_TIMEOUT,
274 KDBUS_ITEM_REPLY_DEAD,
278 * struct kdbus_item - chain of data blocks
279 * @size: Overall data record size
280 * @type: Kdbus_item type of data
281 * @data: Generic bytes
282 * @data32: Generic 32 bit array
283 * @data64: Generic 64 bit array
284 * @str: Generic string
286 * @vec: KDBUS_ITEM_PAYLOAD_VEC
287 * @creds: KDBUS_ITEM_CREDS
288 * @audit: KDBUS_ITEM_AUDIT
289 * @timestamp: KDBUS_ITEM_TIMESTAMP
290 * @name: KDBUS_ITEM_NAME
291 * @memfd: KDBUS_ITEM_PAYLOAD_MEMFD
292 * @name_change: KDBUS_ITEM_NAME_ADD
293 * KDBUS_ITEM_NAME_REMOVE
294 * KDBUS_ITEM_NAME_CHANGE
295 * @id_change: KDBUS_ITEM_ID_ADD
296 * KDBUS_ITEM_ID_REMOVE
297 * @policy: KDBUS_ITEM_POLICY_NAME
298 * KDBUS_ITEM_POLICY_ACCESS
310 struct kdbus_vec vec;
311 struct kdbus_creds creds;
312 struct kdbus_audit audit;
313 struct kdbus_timestamp timestamp;
314 struct kdbus_name name;
315 struct kdbus_memfd memfd;
317 struct kdbus_notify_name_change name_change;
318 struct kdbus_notify_id_change id_change;
319 struct kdbus_policy policy;
324 * enum kdbus_msg_flags - type of message
325 * @KDBUS_MSG_FLAGS_EXPECT_REPLY: Expect a reply message, used for
326 * method calls. The userspace-supplied
327 * cookie identifies the message and the
328 * respective reply carries the cookie
330 * @KDBUS_MSG_FLAGS_NO_AUTO_START: Do not start a service, if the addressed
331 * name is not currently active
333 enum kdbus_msg_flags {
334 KDBUS_MSG_FLAGS_EXPECT_REPLY = 1 << 0,
335 KDBUS_MSG_FLAGS_NO_AUTO_START = 1 << 1,
339 * enum kdbus_payload_type - type of payload carried by message
340 * @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message
341 * @KDBUS_PAYLOAD_DBUS: D-Bus marshalling "DBusDBus"
343 enum kdbus_payload_type {
344 KDBUS_PAYLOAD_KERNEL,
345 KDBUS_PAYLOAD_DBUS = 0x4442757344427573ULL,
349 * struct kdbus_msg - the representation of a kdbus message
350 * @size: Total size of the message
351 * @flags: Message flags (KDBUS_MSG_FLAGS_*)
352 * @priority: Message queue priority value
353 * @dst_id: 64-bit ID of the destination connection
354 * @src_id: 64-bit ID of the source connection
355 * @payload_type: Payload type (KDBUS_PAYLOAD_*)
356 * @cookie: Userspace-supplied cookie, for the connection
357 * to identify its messages
358 * @timeout_ns: The time to wait for a message reply from the peer.
359 * If there is no reply, a kernel-generated message
360 * with an attached KDBUS_ITEM_REPLY_TIMEOUT item
361 * is sent to @src_id.
362 * @cookie_reply: A reply to the requesting message with the same
363 * cookie. The requesting connection can match its
364 * request and the reply with this value
365 * @items: A list of kdbus_items containing the message payload
379 struct kdbus_item items[0];
380 } __attribute__((aligned(8)));
383 * enum kdbus_recv_flags - flags for de-queuing messages
384 * @KDBUS_RECV_PEEK: Return the next queued message without
385 * actually de-queuing it, and without installing
386 * any file descriptors or other resources. It is
387 * usually used to determine the activating
388 * connection of a bus name.
389 * @KDBUS_RECV_DROP: Drop and free the next queued message and all
390 * its resources without actually receiving it.
391 * @KDBUS_RECV_USE_PRIORITY: Only de-queue messages with the specified or
392 * higher priority (lowest values); if not set,
393 * the priority value is ignored.
395 enum kdbus_recv_flags {
396 KDBUS_RECV_PEEK = 1 << 0,
397 KDBUS_RECV_DROP = 1 << 1,
398 KDBUS_RECV_USE_PRIORITY = 1 << 2,
402 * kdbus_cmd_recv - struct to de-queue a buffered message
403 * @flags: KDBUS_RECV_* flags
404 * @priority: Minimum priority of the messages to de-queue. Lowest
405 * values have the highest priority.
406 * @offset: Returned offset in the pool where the message is
407 * stored. The user must use KDBUS_CMD_FREE to free
408 * the allocated memory.
410 * This struct is used with the KDBUS_CMD_MSG_RECV ioctl.
412 struct kdbus_cmd_recv {
416 } __attribute__((aligned(8)));
419 * enum kdbus_policy_access_type - permissions of a policy record
420 * @_KDBUS_POLICY_ACCESS_NULL: Uninitialized/invalid
421 * @KDBUS_POLICY_ACCESS_USER: Grant access to a uid
422 * @KDBUS_POLICY_ACCESS_GROUP: Grant access to gid
423 * @KDBUS_POLICY_ACCESS_WORLD: World-accessible
425 enum kdbus_policy_access_type {
426 _KDBUS_POLICY_ACCESS_NULL,
427 KDBUS_POLICY_ACCESS_USER,
428 KDBUS_POLICY_ACCESS_GROUP,
429 KDBUS_POLICY_ACCESS_WORLD,
433 * enum kdbus_policy_access_flags - mode flags
434 * @KDBUS_POLICY_RECV: Allow receive
435 * @KDBUS_POLICY_SEND: Allow send
436 * @KDBUS_POLICY_OWN: Allow to own a well-known name
438 enum kdbus_policy_type {
439 KDBUS_POLICY_RECV = 1 << 2,
440 KDBUS_POLICY_SEND = 1 << 1,
441 KDBUS_POLICY_OWN = 1 << 0,
445 * struct kdbus_cmd_policy - a series of policies to upload
446 * @size: The total size of the structure
447 * @policies: The policies to upload
449 * A KDBUS_POLICY_NAME must always preceeds a KDBUS_POLICY_ACCESS entry.
450 * A new KDBUS_POLICY_NAME can be added after KDBUS_POLICY_ACCESS for
451 * chaining multiple policies together.
453 struct kdbus_cmd_policy {
455 struct kdbus_item policies[0];
456 } __attribute__((aligned(8)));
459 * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello
460 * @KDBUS_HELLO_ACCEPT_FD: The connection allows the receiving of
461 * any passed file descriptors
462 * @KDBUS_HELLO_ACTIVATOR: Special-purpose connection which registers
463 * a well-know name for a process to be started
464 * when traffic arrives
465 * @KDBUS_HELLO_MONITOR: Special-purpose connection to monitor
468 enum kdbus_hello_flags {
469 KDBUS_HELLO_ACCEPT_FD = 1 << 0,
470 KDBUS_HELLO_ACTIVATOR = 1 << 1,
471 KDBUS_HELLO_MONITOR = 1 << 2,
475 * enum kdbus_attach_flags - flags for metadata attachments
476 * @KDBUS_ATTACH_TIMESTAMP: Timestamp
477 * @KDBUS_ATTACH_CREDS: Credentials
478 * @KDBUS_ATTACH_NAMES: Well-known names
479 * @KDBUS_ATTACH_COMM: The "comm" process identifier
480 * @KDBUS_ATTACH_EXE: The path of the executable
481 * @KDBUS_ATTACH_CMDLINE: The process command line
482 * @KDBUS_ATTACH_CGROUP: The croup membership
483 * @KDBUS_ATTACH_CAPS: The process capabilities
484 * @KDBUS_ATTACH_SECLABEL: The security label
485 * @KDBUS_ATTACH_AUDIT: The audit IDs
486 * @KDBUS_ATTACH_CONN_NAME: The human-readable connection name
488 enum kdbus_attach_flags {
489 KDBUS_ATTACH_TIMESTAMP = 1 << 0,
490 KDBUS_ATTACH_CREDS = 1 << 1,
491 KDBUS_ATTACH_NAMES = 1 << 2,
492 KDBUS_ATTACH_COMM = 1 << 3,
493 KDBUS_ATTACH_EXE = 1 << 4,
494 KDBUS_ATTACH_CMDLINE = 1 << 5,
495 KDBUS_ATTACH_CGROUP = 1 << 6,
496 KDBUS_ATTACH_CAPS = 1 << 7,
497 KDBUS_ATTACH_SECLABEL = 1 << 8,
498 KDBUS_ATTACH_AUDIT = 1 << 9,
499 KDBUS_ATTACH_CONN_NAME = 1 << 10,
503 * struct kdbus_cmd_hello - struct to say hello to kdbus
504 * @size: The total size of the structure
505 * @conn_flags: Connection flags (KDBUS_HELLO_*). The kernel will
506 * return its capabilities in that field.
507 * @attach_flags: Mask of metadata to attach to each message sent
509 * @bus_flags: The flags field copied verbatim from the original
510 * KDBUS_CMD_BUS_MAKE ioctl. It's intended to be useful
511 * to do negotiation of features of the payload that is
512 * transferred (kernel → userspace)
513 * @id: The ID of this connection (kernel → userspace)
514 * @bloom_size: The bloom filter size chosen by the owner
515 * (kernel → userspace)
516 * @pool_size: Size of the connection's buffer where the received
517 * messages are placed
518 * @id128: Unique 128-bit ID of the bus (kernel → userspace)
519 * @items: A list of items
521 * This struct is used with the KDBUS_CMD_HELLO ioctl.
523 struct kdbus_cmd_hello {
532 struct kdbus_item items[0];
533 } __attribute__((aligned(8)));
535 /* Flags for KDBUS_CMD_{BUS,EP,NS}_MAKE */
536 enum kdbus_make_flags {
537 KDBUS_MAKE_ACCESS_GROUP = 1 << 0,
538 KDBUS_MAKE_ACCESS_WORLD = 1 << 1,
539 KDBUS_MAKE_POLICY_OPEN = 1 << 2,
543 * struct kdbus_cmd_make - struct to make a bus, an endpoint or a namespace
544 * @size: The total size of the struct
545 * @flags: Properties for the bus/ep/ns to create
546 * @items: Items describing details
548 * This structure is used with the KDBUS_CMD_BUS_MAKE, KDBUS_CMD_EP_MAKE and
549 * KDBUS_CMD_NS_MAKE ioctls.
551 struct kdbus_cmd_make {
554 struct kdbus_item items[0];
555 } __attribute__((aligned(8)));
558 * enum kdbus_name_flags - properties of a well-known name
559 * @KDBUS_NAME_REPLACE_EXISTING: Try to replace name of other connections
560 * @KDBUS_NAME_ALLOW_REPLACEMENT: Allow the replacement of the name
561 * @KDBUS_NAME_QUEUE: Name should be queued if busy
562 * @KDBUS_NAME_IN_QUEUE: Name is queued
563 * @KDBUS_NAME_ACTIVATOR: Name is owned by a activator connection
565 enum kdbus_name_flags {
566 KDBUS_NAME_REPLACE_EXISTING = 1 << 0,
567 KDBUS_NAME_ALLOW_REPLACEMENT = 1 << 1,
568 KDBUS_NAME_QUEUE = 1 << 2,
569 KDBUS_NAME_IN_QUEUE = 1 << 3,
570 KDBUS_NAME_ACTIVATOR = 1 << 4,
574 * struct kdbus_cmd_name - struct to describe a well-known name
575 * @size: The total size of the struct
576 * @flags: Flags for a name entry (KDBUS_NAME_*)
577 * @owner_id: The current owner of the name. For requests,
578 * privileged users may set this field to
579 * (de)register names on behalf of other connections.
580 * @conn_flags: The flags of the owning connection (KDBUS_HELLO_*)
581 * @name: The well-known name
583 * This structure is used with the KDBUS_CMD_NAME_ACQUIRE ioctl.
585 struct kdbus_cmd_name {
591 } __attribute__((aligned(8)));
594 * enum kdbus_name_list_flags - what to include into the returned list
595 * @KDBUS_NAME_LIST_UNIQUE: All active connections
596 * @KDBUS_NAME_LIST_NAMES: All known well-known names
597 * @KDBUS_NAME_LIST_ACTIVATORS: All activator connections
598 * @KDBUS_NAME_LIST_QUEUED: All queued-up names
600 enum kdbus_name_list_flags {
601 KDBUS_NAME_LIST_UNIQUE = 1 << 0,
602 KDBUS_NAME_LIST_NAMES = 1 << 1,
603 KDBUS_NAME_LIST_ACTIVATORS = 1 << 2,
604 KDBUS_NAME_LIST_QUEUED = 1 << 3,
608 * struct kdbus_cmd_name_list - request a list of name entries
609 * @flags: Flags for the query (KDBUS_NAME_LIST_*)
610 * @offset: The returned offset in the caller's pool buffer.
611 * The user must use KDBUS_CMD_FREE to free the
614 * This structure is used with the KDBUS_CMD_NAME_LIST ioctl.
616 struct kdbus_cmd_name_list {
619 } __attribute__((aligned(8)));
622 * struct kdbus_name_list - information returned by KDBUS_CMD_NAME_LIST
623 * @size: The total size of the structure
624 * @names: A list of names
626 * Note that the user is responsible for freeing the allocated memory with
627 * the KDBUS_CMD_FREE ioctl.
629 struct kdbus_name_list {
631 struct kdbus_cmd_name names[0];
635 * struct kdbus_cmd_conn_info - struct used for KDBUS_CMD_CONN_INFO ioctl
636 * @size: The total size of the struct
637 * @flags: KDBUS_ATTACH_* flags
638 * @id: The 64-bit ID of the connection. If set to zero, passing
639 * @name is required. kdbus will look up the name to
640 * determine the ID in this case.
641 * @offset: Returned offset in the caller's pool buffer where the
642 * kdbus_conn_info struct result is stored. The user must
643 * use KDBUS_CMD_FREE to free the allocated memory.
644 * @name: The optional well-known name to look up. Only needed in
647 * On success, the KDBUS_CMD_CONN_INFO ioctl will return 0 and @offset will
648 * tell the user the offset in the connection pool buffer at which to find the
649 * result in a struct kdbus_conn_info.
651 struct kdbus_cmd_conn_info {
657 } __attribute__((aligned(8)));
660 * struct kdbus_conn_info - information returned by KDBUS_CMD_CONN_INFO
661 * @size: The total size of the struct
662 * @id: The connection's 64-bit ID
663 * @flags: The connection's flags
664 * @items: A list of struct kdbus_item
666 * Note that the user is responsible for freeing the allocated memory with
667 * the KDBUS_CMD_FREE ioctl.
669 struct kdbus_conn_info {
673 struct kdbus_item items[0];
677 * struct kdbus_cmd_match - struct to add or remove matches
678 * @size: The total size of the struct
679 * @owner_id: Privileged users may (de)register matches on behalf
681 * @cookie: Userspace supplied cookie. When removing, the cookie
682 * identifies the match to remove
683 * @items: A list of items for additional information
685 * This structure is used with the KDBUS_CMD_ADD_MATCH and
686 * KDBUS_CMD_REMOVE_MATCH ioctl.
688 struct kdbus_cmd_match {
692 struct kdbus_item items[0];
693 } __attribute__((aligned(8)));
696 * struct kdbus_cmd_memfd_make - create a kdbus memfd
697 * @size: The total size of the struct
698 * @file_size: The initial file size
699 * @fd: The returned file descriptor number
700 * @__pad: Padding to ensure proper alignement
701 * @items: A list of items for additional information
703 * This structure is used with the KDBUS_CMD_MEMFD_NEW ioctl.
705 struct kdbus_cmd_memfd_make {
710 struct kdbus_item items[0];
711 } __attribute__((aligned(8)));
714 * enum kdbus_ioctl_type - Ioctl API
715 * @KDBUS_CMD_BUS_MAKE: After opening the "control" device node, this
716 * command creates a new bus with the specified
717 * name. The bus is immediately shut down and
718 * cleaned up when the opened "control" device node
720 * @KDBUS_CMD_NS_MAKE: Similar to KDBUS_CMD_BUS_MAKE, but it creates a
721 * new kdbus namespace.
722 * @KDBUS_CMD_EP_MAKE: Creates a new named special endpoint to talk to
723 * the bus. Such endpoints usually carry a more
724 * restrictive policy and grant restricted access
725 * to specific applications.
726 * @KDBUS_CMD_HELLO: By opening the bus device node a connection is
727 * created. After a HELLO the opened connection
728 * becomes an active peer on the bus.
729 * @KDBUS_CMD_BYEBYE: Disconnect a connection. If the connection's
730 * message list is empty, the calls succeeds, and
731 * the handle is rendered unusable. Otherwise,
732 * -EAGAIN is returned without any further side-
734 * @KDBUS_CMD_MSG_SEND: Send a message and pass data from userspace to
736 * @KDBUS_CMD_MSG_RECV: Receive a message from the kernel which is
737 * placed in the receiver's pool.
738 * @KDBUS_CMD_FREE: Release the allocated memory in the receiver's
740 * @KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
741 * the connection. Well-known names are used to
742 * address a peer on the bus.
743 * @KDBUS_CMD_NAME_RELEASE: Release a well-known name the connection
745 * @KDBUS_CMD_NAME_LIST: Retrieve the list of all currently registered
746 * well-known and unique names.
747 * @KDBUS_CMD_CONN_INFO: Retrieve credentials and properties of the
748 * initial creator of the connection. The data was
749 * stored at registration time and does not
750 * necessarily represent the connected process or
751 * the actual state of the process.
752 * @KDBUS_CMD_MATCH_ADD: Install a match which broadcast messages should
753 * be delivered to the connection.
754 * @KDBUS_CMD_MATCH_REMOVE: Remove a current match for broadcast messages.
755 * @KDBUS_CMD_EP_POLICY_SET: Set the policy of an endpoint. It is used to
756 * restrict the access for endpoints created with
758 * @KDBUS_CMD_MEMFD_NEW: Return a new file descriptor which provides an
759 * anonymous shared memory file and which can be
760 * used to pass around larger chunks of data.
761 * Kdbus memfd files can be sealed, which allows
762 * the receiver to trust the data it has received.
763 * Kdbus memfd files expose only very limited
764 * operations, they can be mmap()ed, seek()ed,
765 * (p)read(v)() and (p)write(v)(); most other
766 * common file operations are not implemented.
767 * Special caution needs to be taken with
768 * read(v)()/write(v)() on a shared file; the
769 * underlying file position is always shared
770 * between all users of the file and race against
771 * each other, pread(v)()/pwrite(v)() avoid these
773 * @KDBUS_CMD_MEMFD_SIZE_GET: Return the size of the underlying file, which
774 * changes with write().
775 * @KDBUS_CMD_MEMFD_SIZE_SET: Truncate the underlying file to the specified
777 * @KDBUS_CMD_MEMFD_SEAL_GET: Return the state of the file sealing.
778 * @KDBUS_CMD_MEMFD_SEAL_SET: Seal or break a seal of the file. Only files
779 * which are not shared with other processes and
780 * which are currently not mapped can be sealed.
781 * The current process needs to be the one and
782 * single owner of the file, the sealing cannot
783 * be changed as long as the file is shared.
785 enum kdbus_ioctl_type {
786 KDBUS_CMD_BUS_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_make),
787 KDBUS_CMD_NS_MAKE = _IOR (KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_make),
788 KDBUS_CMD_EP_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_make),
790 KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_hello),
791 KDBUS_CMD_BYEBYE = _IO (KDBUS_IOC_MAGIC, 0x31),
793 KDBUS_CMD_MSG_SEND = _IOW (KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg),
794 KDBUS_CMD_MSG_RECV = _IOWR(KDBUS_IOC_MAGIC, 0x41, struct kdbus_cmd_recv),
795 KDBUS_CMD_FREE = _IOW (KDBUS_IOC_MAGIC, 0x42, __u64 *),
797 KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name),
798 KDBUS_CMD_NAME_RELEASE = _IOW (KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name),
799 KDBUS_CMD_NAME_LIST = _IOWR(KDBUS_IOC_MAGIC, 0x52, struct kdbus_cmd_name_list),
801 KDBUS_CMD_CONN_INFO = _IOWR(KDBUS_IOC_MAGIC, 0x60, struct kdbus_cmd_conn_info),
803 KDBUS_CMD_MATCH_ADD = _IOW (KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_match),
804 KDBUS_CMD_MATCH_REMOVE = _IOW (KDBUS_IOC_MAGIC, 0x71, struct kdbus_cmd_match),
806 KDBUS_CMD_EP_POLICY_SET = _IOW (KDBUS_IOC_MAGIC, 0x80, struct kdbus_cmd_policy),
808 KDBUS_CMD_MEMFD_NEW = _IOWR(KDBUS_IOC_MAGIC, 0xc0, struct kdbus_cmd_memfd_make),
809 KDBUS_CMD_MEMFD_SIZE_GET = _IOR (KDBUS_IOC_MAGIC, 0xc1, __u64 *),
810 KDBUS_CMD_MEMFD_SIZE_SET = _IOW (KDBUS_IOC_MAGIC, 0xc2, __u64 *),
811 KDBUS_CMD_MEMFD_SEAL_GET = _IOR (KDBUS_IOC_MAGIC, 0xc3, int *),
812 KDBUS_CMD_MEMFD_SEAL_SET = _IO (KDBUS_IOC_MAGIC, 0xc4),
816 * errno - api error codes
817 * @E2BIG: A message contains too many records or items.
818 * @EADDRINUSE: A well-known bus name is already taken by another
820 * @EADDRNOTAVAIL: A message flagged not to activate a service, addressed
821 * a service which is not currently running.
822 * @EAGAIN: No messages are queued at the moment.
823 * @EBADF: File descriptors passed with the message are not valid.
824 * @EBADFD: A bus connection is in a corrupted state.
825 * @EBADMSG: Passed data contains a combination of conflicting or
826 * inconsistent types.
827 * @EBUSY: The user tried to say BYEBYE to a connection, but the
828 * connection had a non-empty message list.
829 * @ECONNRESET: A connection is shut down, no further operations are
831 * @ECOMM: A peer does not accept the file descriptors addressed
833 * @EDESTADDRREQ: The well-known bus name is required but missing.
834 * @EDOM: The size of data does not match the expectations. Used
835 * for the size of the bloom filter bit field.
836 * @EEXIST: A requested namespace, bus or endpoint with the same
837 * name already exists. A specific data type, which is
838 * only expected once, is provided multiple times.
839 * @EFAULT: The supplied memory could not be accessed, or the data
840 * is not properly aligned.
841 * @EINVAL: The provided data does not match its type or other
842 * expectations, like a string which is not NUL terminated,
843 * or a string length that points behind the first
844 * \0-byte in the string.
845 * @EMEDIUMTYPE: A file descriptor which is not a kdbus memfd was
846 * refused to send as KDBUS_MSG_PAYLOAD_MEMFD.
847 * @EMFILE: Too many file descriptors have been supplied with a
849 * @EMLINK: Too many requests from this connection to other peers
850 * are queued and waiting for a reply
851 * @EMSGSIZE: The supplied data is larger than the allowed maximum
853 * @ENAMETOOLONG: The requested name is larger than the allowed maximum
855 * @ENOBUFS: There is no space left for the submitted data to fit
856 * into the receiver's pool.
857 * @ENOENT: The name to query information about is currently not on
859 * @ENOMEM: Out of memory.
860 * @ENOMSG: The queue is not empty, but no message with a matching
861 * priority is currently queued.
862 * @ENOSYS: The requested functionality is not available.
863 * @ENOTSUPP: The feature negotiation failed, a not supported feature
864 * was requested, or an unknown item type was received.
865 * @ENOTTY: An unknown ioctl command was received.
866 * @ENOTUNIQ: A specific data type was addressed to a broadcast
867 * address, but only direct addresses support this kind of
869 * @ENXIO: A unique address does not exist, or an offset in the
870 * receiver's pool does not represent a queued message.
871 * @EPERM: The policy prevented an operation. The requested
872 * resource is owned by another entity.
873 * @ESHUTDOWN: A namespace or endpoint is currently shutting down;
874 * no further operations will be possible.
875 * @ESRCH: A requested well-known bus name is not found.
876 * @ETXTBSY: A kdbus memfd file cannot be sealed or the seal removed,
877 * because it is shared with other processes or still
879 * @EXFULL: The size limits in the pool are reached, no data of
880 * the size tried to submit can be queued.