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_SRC_ID_ANY (~0ULL)
27 #define KDBUS_DST_ID_BROADCAST (~0ULL)
30 * struct kdbus_notify_name_change - name registry change message
31 * @old_id: Former owner of a name
32 * @new_id: New owner of a name
33 * @flags: flags from KDBUS_NAME_*
34 * @name: Well-known name
36 * Sent from kernel to userspace when the owner or starter of
37 * a well-known name changes.
41 * KDBUS_ITEM_NAME_REMOVE
42 * KDBUS_ITEM_NAME_CHANGE
44 struct kdbus_notify_name_change {
52 * struct kdbus_notify_id_change - name registry change message
53 * @id: New or former owner of the name
54 * @flags: flags field from KDBUS_HELLO_*
56 * Sent from kernel to userspace when the owner or starter of
57 * a well-known name changes.
61 * KDBUS_ITEM_ID_REMOVE
63 struct kdbus_notify_id_change {
69 * struct kdbus_creds - process credentials
74 * @starttime: Starttime of the process
76 * The starttime of the process PID. This is useful to detect PID overruns
77 * from the client side. i.e. if you use the PID to look something up in
78 * /proc/$PID/ you can afterwards check the starttime field of it, to ensure
79 * you didn't run into a PID overrun.
93 * struct kdbus_audit - audit information
94 * @sessionid: The audit session ID
95 * @loginuid: The audit login uid
106 * struct kdbus_timestamp
107 * @monotonic_ns: Monotonic timestamp, in nanoseconds
108 * @realtime_ns: Realtime timestamp, in nanoseconds
111 * KDBUS_ITEM_TIMESTAMP
113 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
125 * KDBUS_ITEM_PAYLOAD_VEC
136 * struct kdbus_memfd - a kdbus memfd
137 * @size: The memfd's size
138 * @fd: The file descriptor number
139 * @__pad: Padding to make the struct aligned
142 * KDBUS_ITEM_PAYLOAD_MEMFD
151 * struct kdbus_name - a registered well-known name with its flags
152 * @flags: flags from KDBUS_NAME_*
153 * @name: well-known name
164 * struct kdbus_policy_access - policy access item
165 * @type: One of KDBUS_POLICY_ACCESS_* types
166 * @bits: Access to grant. One of KDBUS_POLICY_*
167 * @id: For KDBUS_POLICY_ACCESS_USER, the uid
168 * For KDBUS_POLICY_ACCESS_GROUP, the gid
171 * struct kdbus_policy
173 struct kdbus_policy_access {
174 __u64 type; /* USER, GROUP, WORLD */
175 __u64 bits; /* RECV, SEND, OWN */
176 __u64 id; /* uid, gid, 0 */
180 * struct kdbus_policy - a policy item
181 * @access: Policy access details
182 * @name: Well-known name to grant access to
185 * KDBUS_POLICY_ACCESS
186 * KDBUS_ITEM_POLICY_NAME
188 struct kdbus_policy {
190 struct kdbus_policy_access access;
196 * enum kdbus_item_type - item types to chain data in a list
197 * @KDBUS_ITEM_PAYLOAD_VEC: Vector to data
198 * @KDBUS_ITEM_PAYLOAD_OFF: Data at returned offset in the pool
199 * @KDBUS_ITEM_PAYLOAD_MEMFD: Data as sealed memfd
200 * @KDBUS_ITEM_FDS: Attached file descriptors
201 * @KDBUS_ITEM_BLOOM: For broadcasts, carries bloom filter
202 * @KDBUS_ITEM_DST_NAME: Destination's well-known name
203 * @KDBUS_ITEM_PRIORITY: Queue priority for message
204 * @KDBUS_ITEM_MAKE_NAME: Name of namespace, bus, endpoint
205 * @KDBUS_ITEM_POLICY_NAME: Policy in struct kdbus_policy
206 * @KDBUS_ITEM_POLICY_ACCESS: Policy in struct kdbus_policy
207 * @KDBUS_ITEM_NAME: Well-know name with flags
208 * @KDBUS_ITEM_STARTER_NAME: Well-known name for the starter
209 * @KDBUS_ITEM_TIMESTAMP: Timestamp
210 * @KDBUS_ITEM_CREDS: Process credential
211 * @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier
212 * @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier
213 * @KDBUS_ITEM_EXE: The path of the executable
214 * @KDBUS_ITEM_CMDLINE: The process command line
215 * @KDBUS_ITEM_CGROUP: The croup membership
216 * @KDBUS_ITEM_CAPS: The process capabilities
217 * @KDBUS_ITEM_SECLABEL: The security label
218 * @KDBUS_ITEM_AUDIT: The audit IDs
219 * @KDBUS_ITEM_NAME_ADD: Notify in struct kdbus_notify_name_change
220 * @KDBUS_ITEM_NAME_REMOVE: Notify in struct kdbus_notify_name_change
221 * @KDBUS_ITEM_NAME_CHANGE: Notify in struct kdbus_notify_name_change
222 * @KDBUS_ITEM_ID_ADD: Notify in struct kdbus_notify_id_change
223 * @KDBUS_ITEM_ID_REMOVE: Notify in struct kdbus_notify_id_change
224 * @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached
225 * @KDBUS_ITEM_REPLY_DEAD: Destination died
227 enum kdbus_item_type {
229 _KDBUS_ITEM_USER_BASE,
230 KDBUS_ITEM_PAYLOAD_VEC = _KDBUS_ITEM_USER_BASE,
231 KDBUS_ITEM_PAYLOAD_OFF,
232 KDBUS_ITEM_PAYLOAD_MEMFD,
237 KDBUS_ITEM_MAKE_NAME,
239 _KDBUS_ITEM_POLICY_BASE = 0x400,
240 KDBUS_ITEM_POLICY_NAME = _KDBUS_ITEM_POLICY_BASE,
241 KDBUS_ITEM_POLICY_ACCESS,
243 _KDBUS_ITEM_ATTACH_BASE = 0x600,
244 KDBUS_ITEM_NAME = _KDBUS_ITEM_ATTACH_BASE,
245 KDBUS_ITEM_STARTER_NAME,
246 KDBUS_ITEM_TIMESTAMP,
257 _KDBUS_ITEM_KERNEL_BASE = 0x800,
258 KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
259 KDBUS_ITEM_NAME_REMOVE,
260 KDBUS_ITEM_NAME_CHANGE,
262 KDBUS_ITEM_ID_REMOVE,
263 KDBUS_ITEM_REPLY_TIMEOUT,
264 KDBUS_ITEM_REPLY_DEAD,
268 * struct kdbus_item - chain of data blocks
269 * @size: Overall data record size
270 * @type: Kdbus_item type of data
271 * @data: Generic bytes
272 * @data32: Generic 32 bit array
273 * @data64: Generic 64 bit array
274 * @str: Generic string
276 * @vec: KDBUS_ITEM_PAYLOAD_VEC
277 * @creds: KDBUS_ITEM_CREDS
278 * @audit: KDBUS_ITEM_AUDIT
279 * @timestamp: KDBUS_ITEM_TIMESTAMP
280 * @name: KDBUS_ITEM_NAME
281 * @memfd: KDBUS_ITEM_PAYLOAD_MEMFD
282 * @name_change: KDBUS_ITEM_NAME_ADD
283 * KDBUS_ITEM_NAME_REMOVE
284 * KDBUS_ITEM_NAME_CHANGE
285 * @id_change: KDBUS_ITEM_ID_ADD
286 * KDBUS_ITEM_ID_REMOVE
287 * @policy: KDBUS_ITEM_POLICY_NAME
288 * KDBUS_ITEM_POLICY_ACCESS
300 struct kdbus_vec vec;
301 struct kdbus_creds creds;
302 struct kdbus_audit audit;
303 struct kdbus_timestamp timestamp;
304 struct kdbus_name name;
305 struct kdbus_memfd memfd;
307 struct kdbus_notify_name_change name_change;
308 struct kdbus_notify_id_change id_change;
309 struct kdbus_policy policy;
314 * enum kdbus_msg_flags - type of message
315 * @KDBUS_MSG_FLAGS_EXPECT_REPLY: Expect a reply message, used for method
316 * calls. The cookie identifies the
317 * message and the respective reply
318 * @KDBUS_MSG_FLAGS_NO_AUTO_START: Do not start a service, if the addressed
319 * name is not currently active
321 enum kdbus_msg_flags {
322 KDBUS_MSG_FLAGS_EXPECT_REPLY = 1 << 0,
323 KDBUS_MSG_FLAGS_NO_AUTO_START = 1 << 1,
327 * enum kdbus_payload_type - type of payload carried by message
328 * @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message
329 * @KDBUS_PAYLOAD_DBUS: D-Bus marshalling
331 enum kdbus_payload_type {
332 KDBUS_PAYLOAD_KERNEL,
333 KDBUS_PAYLOAD_DBUS = 0x4442757356657231ULL, /* 'DBusVer1' */
337 * struct kdbus_msg - the representation of a kdbus message
338 * @size: Total size of the message
339 * @flags: Message flags (KDBUS_MSG_FLAGS_*)
340 * @dst_id: 64-bit ID of the destination connection
341 * @src_id: 64-bit ID of the source connection
342 * @payload_type: Payload type (KDBUS_PAYLOAD_*)
343 * @cookie: Userspace-supplied cookie
344 * @cookie_reply: For kernel-generated messages, this is the cookie
345 * the message is a reply to
346 * @timeout_ns: For non-kernel-generated messages, this denotes the
347 * message timeout in nanoseconds
348 * @items: A list of kdbus_items containing the message payload
361 struct kdbus_item items[0];
365 * enum kdbus_policy_access_type - permissions of a policy record
366 * @KDBUS_POLICY_ACCESS_USER: Grant access to a uid
367 * @KDBUS_POLICY_ACCESS_GROUP: Grant access to gid
368 * @KDBUS_POLICY_ACCESS_WORLD: World-accessible
370 enum kdbus_policy_access_type {
371 _KDBUS_POLICY_ACCESS_NULL,
372 KDBUS_POLICY_ACCESS_USER,
373 KDBUS_POLICY_ACCESS_GROUP,
374 KDBUS_POLICY_ACCESS_WORLD,
378 * enum kdbus_policy_access_flags - mode flags
379 * @KDBUS_POLICY_RECV: Allow receive
380 * @KDBUS_POLICY_SEND: Allow send
381 * @KDBUS_POLICY_OWN: Allow to own a well-known name
383 enum kdbus_policy_type {
384 KDBUS_POLICY_RECV = 1 << 2,
385 KDBUS_POLICY_SEND = 1 << 1,
386 KDBUS_POLICY_OWN = 1 << 0,
390 * struct kdbus_cmd_policy - a series of policies to upload
391 * @size: The total size of the structure
392 * @policies: The policies to upload
394 * A KDBUS_POLICY_NAME must always preceeds a KDBUS_POLICY_ACCESS entry.
395 * A new KDBUS_POLICY_NAME can be added after KDBUS_POLICY_ACCESS for
396 * chaining multiple policies together.
398 struct kdbus_cmd_policy {
400 struct kdbus_item policies[0];
404 * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello
405 * @KDBUS_HELLO_STARTER: The connection registers a name for activation
407 * @KDBUS_HELLO_ACCEPT_FD: The connection allows the receiving of
408 * any passed file descriptors
410 enum kdbus_hello_flags {
411 KDBUS_HELLO_STARTER = 1 << 0,
412 KDBUS_HELLO_ACCEPT_FD = 1 << 1,
416 * enum kdbus_attach_flags - flags for metadata attachments
417 * @KDBUS_ATTACH_TIMESTAMP: Timestamp
418 * @KDBUS_ATTACH_CREDS: Credentials
419 * @KDBUS_ATTACH_NAMES: Well-known names
420 * @KDBUS_ATTACH_COMM: The "comm" process identifier
421 * @KDBUS_ATTACH_EXE: The path of the executable
422 * @KDBUS_ATTACH_CMDLINE: The process command line
423 * @KDBUS_ATTACH_CGROUP: The croup membership
424 * @KDBUS_ATTACH_CAPS: The process capabilities
425 * @KDBUS_ATTACH_SECLABEL: The security label
426 * @KDBUS_ATTACH_AUDIT: The audit IDs
428 enum kdbus_attach_flags {
429 KDBUS_ATTACH_TIMESTAMP = 1 << 0,
430 KDBUS_ATTACH_CREDS = 1 << 1,
431 KDBUS_ATTACH_NAMES = 1 << 2,
432 KDBUS_ATTACH_COMM = 1 << 3,
433 KDBUS_ATTACH_EXE = 1 << 4,
434 KDBUS_ATTACH_CMDLINE = 1 << 5,
435 KDBUS_ATTACH_CGROUP = 1 << 6,
436 KDBUS_ATTACH_CAPS = 1 << 7,
437 KDBUS_ATTACH_SECLABEL = 1 << 8,
438 KDBUS_ATTACH_AUDIT = 1 << 9,
442 * struct kdbus_cmd_hello - struct to say hello to kdbus
443 * @size: The total size of the structure
444 * @conn_flags: Connection flags (KDBUS_HELLO_*). The kernel will
445 * return its capabilities in that field.
446 * @attach_flags: Mask of metadata to attach to each message sent
448 * @bus_flags: The flags field copied verbatim from the original
449 * KDBUS_CMD_BUS_MAKE ioctl. It's intended to be useful
450 * to do negotiation of features of the payload that is
451 * transferred (kernel → userspace)
452 * @id: The ID of this connection (kernel → userspace)
453 * @bloom_size: The bloom filter size chosen by the owner
454 * (kernel → userspace)
455 * @pool_size: Maximum size of the pool buffer (kernel → userspace)
456 * @id128: Unique 128-bit ID of the bus (kernel → userspace)
457 * @items: A list of items
459 * This struct is used with the KDBUS_CMD_HELLO ioctl. See the ioctl
460 * documentation for more information.
462 struct kdbus_cmd_hello {
471 struct kdbus_item items[0];
474 /* Flags for KDBUS_CMD_{BUS,EP,NS}_MAKE */
475 enum kdbus_make_flags {
476 KDBUS_MAKE_ACCESS_GROUP = 1 << 0,
477 KDBUS_MAKE_ACCESS_WORLD = 1 << 1,
478 KDBUS_MAKE_POLICY_OPEN = 1 << 2,
482 * struct kdbus_cmd_bus_make - struct to make a bus
483 * @size: The total size of the struct
484 * @flags: Properties for the bus to create
485 * @bloom_size: Size of the bloom filter for this bus
486 * @items: Items describing details such as the name of the bus
488 * This structure is used with the KDBUS_CMD_BUS_MAKE ioctl. Refer to the
489 * documentation for more information.
491 struct kdbus_cmd_bus_make {
495 struct kdbus_item items[0];
499 * struct kdbus_cmd_ep_make - struct to make an endpoint
500 * @size: The total size of the struct
501 * @flags: Unused for now
502 * @items: Items describing details such as the
503 * name of the endpoint
505 * This structure is used with the KDBUS_CMD_EP_MAKE ioctl. Refer to the
506 * documentation for more information.
508 struct kdbus_cmd_ep_make {
511 struct kdbus_item items[0];
515 * struct kdbus_cmd_ns_make - struct to make a namespace
516 * @size: The total size of the struct
517 * @flags: Unused for now
518 * @items: Items describing details such as the
519 * name of the namespace
521 * This structure is used with the KDBUS_CMD_NS_MAKE ioctl. Refer to the
522 * documentation for more information.
524 struct kdbus_cmd_ns_make {
527 struct kdbus_item items[0];
531 * enum kdbus_name_flags - properties of a well-known name
532 * @KDBUS_NAME_REPLACE_EXISTING: Try to replace name of other connections
533 * @KDBUS_NAME_QUEUE: Name should be queued if busy
534 * @KDBUS_NAME_ALLOW_REPLACEMENT: Allow the replacement of the name
535 * @KDBUS_NAME_IN_QUEUE: Name is queued
537 enum kdbus_name_flags {
538 /* userspace → kernel */
539 KDBUS_NAME_REPLACE_EXISTING = 1 << 0,
540 KDBUS_NAME_QUEUE = 1 << 1,
541 KDBUS_NAME_ALLOW_REPLACEMENT = 1 << 2,
543 /* kernel → userspace */
544 KDBUS_NAME_IN_QUEUE = 1 << 16,
548 * struct kdbus_cmd_name - struct to describe a well-known name
549 * @size: The total size of the struct
550 * @flags: Flags for a name entry (KDBUS_NAME_*)
551 * @id: Privileged users may use this field to (de)register
552 * names on behalf of other peers.
553 * @conn_flags: The flags of the owning connection (KDBUS_HELLO_*)
554 * @name: The well-known name
556 * This structure is used with the KDBUS_CMD_NAME_ACQUIRE ioctl.
557 * Refer to the documentation for more information.
559 struct kdbus_cmd_name {
568 * enum kdbus_name_list_flags - what to include into the returned list
569 * @KDBUS_NAME_LIST_UNIQUE: All active connections
570 * @KDBUS_NAME_LIST_NAMES: All known well-known names
571 * @KDBUS_NAME_LIST_STARTERS: All connections which are starter connections
572 * @KDBUS_NAME_LIST_QUEUED: All queued-up names
574 enum kdbus_name_list_flags {
575 KDBUS_NAME_LIST_UNIQUE = 1 << 0,
576 KDBUS_NAME_LIST_NAMES = 1 << 1,
577 KDBUS_NAME_LIST_STARTERS = 1 << 2,
578 KDBUS_NAME_LIST_QUEUED = 1 << 3,
582 * struct kdbus_cmd_name_list - request a list of name entries
583 * @flags: Flags for the query (KDBUS_NAME_LIST_*)
584 * @offset: The returned offset in the caller's pool buffer.
585 * The user must use KDBUS_CMD_FREE to free the
588 * This structure is used with the KDBUS_CMD_NAME_LIST ioctl.
590 struct kdbus_cmd_name_list {
596 * struct kdbus_name_list - information returned by KDBUS_CMD_NAME_LIST
597 * @size: The total size of the structure
598 * @names: A list of names
600 * Note that the user is responsible for freeing the allocated memory with
601 * the KDBUS_CMD_FREE ioctl.
603 struct kdbus_name_list {
605 struct kdbus_cmd_name names[0];
609 * struct kdbus_cmd_conn_info - struct used for KDBUS_CMD_CONN_INFO ioctl
610 * @size: The total size of the struct
611 * @flags: KDBUS_ATTACH_* flags
612 * @id: The 64-bit ID of the connection. If set to zero, passing
613 * @name is required. kdbus will look up the name to determine
614 * the ID in this case.
615 * @offset: Returned offset in the caller's pool buffer where the
616 * kdbus_name_info struct result is stored. The user must
617 * use KDBUS_CMD_FREE to free the allocated memory.
618 * @name: The optional well-known name to look up. Only needed in
621 * On success, the KDBUS_CMD_CONN_INFO ioctl will return 0 and @offset will
622 * tell the user the offset in the connection pool buffer at which to find the
623 * result in a struct kdbus_conn_info.
625 struct kdbus_cmd_conn_info {
634 * struct kdbus_conn_info - information returned by KDBUS_CMD_CONN_INFO
635 * @size: The total size of the struct
636 * @id: The connection's 64-bit ID
637 * @flags: The connection's flags
638 * @items: A list of struct kdbus_item
640 * Note that the user is responsible for freeing the allocated memory with
641 * the KDBUS_CMD_FREE ioctl.
643 struct kdbus_conn_info {
647 struct kdbus_item items[0];
651 * enum kdbus_match_type - type of match record
652 * @KDBUS_MATCH_BLOOM: Matches against KDBUS_MSG_BLOOM
653 * @KDBUS_MATCH_SRC_NAME: Matches a name string
654 * @KDBUS_MATCH_NAME_ADD: Matches a name string
655 * @KDBUS_MATCH_NAME_REMOVE: Matches a name string
656 * @KDBUS_MATCH_NAME_CHANGE: Matches a name string
657 * @KDBUS_MATCH_ID_ADD: Matches an ID
658 * @KDBUS_MATCH_ID_REMOVE: Matches an ID
660 enum kdbus_match_type {
663 KDBUS_MATCH_SRC_NAME,
664 KDBUS_MATCH_NAME_ADD,
665 KDBUS_MATCH_NAME_REMOVE,
666 KDBUS_MATCH_NAME_CHANGE,
668 KDBUS_MATCH_ID_REMOVE,
672 * struct kdbus_cmd_match - struct to add or remove matches
673 * @size: The total size of the struct
674 * @id: Privileged users may (de)register matches on behalf
675 * of other peers. In other cases, set to 0.
676 * @cookie: Userspace supplied cookie. When removing, the cookie
677 * identifies the match to remove.
678 * @src_id: The source ID to match against. Use
679 * KDBUS_MATCH_SRC_ID_ANY or any other value for a unique
681 * @items: A list of items for additional information
683 * This structure is used with the KDBUS_CMD_ADD_MATCH and
684 * KDBUS_CMD_REMOVE_MATCH ioctl. Refer to the documentation for more
687 struct kdbus_cmd_match {
692 struct kdbus_item items[0];
696 * enum kdbus_monitor_flags - flags for monitoring
697 * @KDBUS_MONITOR_ENABLE: Enable monitoring
699 enum kdbus_monitor_flags {
700 KDBUS_MONITOR_ENABLE = 1 << 0,
704 * struct kdbus_cmd_monitor - struct to enable or disable eavesdropping
705 * @id: Privileged users may enable or disable the monitor feature
706 * on behalf of other peers
707 * @flags: Use KDBUS_MONITOR_ENABLE to enable eavesdropping
709 * This structure is used with the KDBUS_CMD_MONITOR ioctl.
710 * Refer to the documentation for more information.
712 struct kdbus_cmd_monitor {
718 * enum kdbus_ioctl_type - Ioctl API
719 * @KDBUS_CMD_BUS_MAKE: After opening the "control" device node, this
720 * command creates a new bus with the specified
721 * name. The bus is immediately shut down and
722 * cleaned up when the opened "control" device node
724 * @KDBUS_CMD_NS_MAKE: Similar to KDBUS_CMD_BUS_MAKE, but it creates a
725 * new kdbus namespace.
726 * @KDBUS_CMD_EP_MAKE: Creates a new named special endpoint to talk to
727 * the bus. Such endpoints usually carry a more
728 * restrictive policy and grant restricted access
729 * to specific applications.
730 * @KDBUS_CMD_HELLO: By opening the bus device node a connection is
731 * created. After a HELLO the opened connection
732 * becomes an active peer on the bus.
733 * @KDBUS_CMD_MSG_SEND: Send a message and pass data from userspace to
735 * @KDBUS_CMD_MSG_RECV: Receive a message from the kernel which is
736 * placed in the receiver's pool.
737 * @KDBUS_CMD_FREE: Release the allocated memory in the receiver's
739 * @KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
740 * the connection. Well-known names are used to
741 * address a peer on the bus.
742 * @KDBUS_CMD_NAME_RELEASE: Release a well-known name the connection
744 * @KDBUS_CMD_NAME_LIST: Retrieve the list of all currently registered
745 * well-known and unique names.
746 * @KDBUS_CMD_CONN_INFO: Retrieve credentials and properties of the
747 * initial creator of the connection. The data was
748 * stored at registration time and does not
749 * necessarily represent the connected process or
750 * the actual state of the process.
751 * @KDBUS_CMD_MATCH_ADD: Install a match which broadcast messages should
752 * be delivered to the connection.
753 * @KDBUS_CMD_MATCH_REMOVE: Remove a current match for broadcast messages.
754 * @KDBUS_CMD_MONITOR: Monitor the bus and receive all transmitted
755 * messages. Privileges are required for this
757 * @KDBUS_CMD_EP_POLICY_SET: Set the policy of an endpoint. It is used to
758 * restrict the access for endpoints created with
760 * @KDBUS_CMD_MEMFD_NEW: Return a new file descriptor which provides an
761 * anonymous shared memory file and which can be
762 * used to pass around larger chunks of data.
763 * Kdbus memfd files can be sealed, which allows
764 * the receiver to trust the data it has received.
765 * Kdbus memfd files expose only very limited
766 * operations, they can be mmap()ed, seek()ed,
767 * (p)read(v)() and (p)write(v)(); most other
768 * common file operations are not implemented.
769 * Special caution needs to be taken with
770 * read(v)()/write(v)() on a shared file; the
771 * underlying file position is always shared
772 * between all users of the file and race against
773 * each other, pread(v)()/pwrite(v)() avoid these
775 * @KDBUS_CMD_MEMFD_SIZE_GET: Return the size of the underlying file, which
776 * changes with write().
777 * @KDBUS_CMD_MEMFD_SIZE_SET: Truncate the underlying file to the specified
779 * @KDBUS_CMD_MEMFD_SEAL_GET: Return the state of the file sealing.
780 * @KDBUS_CMD_MEMFD_SEAL_SET: Seal or break a seal of the file. Only files
781 * which are not shared with other processes and
782 * which are currently not mapped can be sealed.
783 * The current process needs to be the one and
784 * single owner of the file, the sealing cannot
785 * be changed as long as the file is shared.
787 enum kdbus_ioctl_type {
788 KDBUS_CMD_BUS_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_bus_make),
789 KDBUS_CMD_NS_MAKE = _IOR (KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_ns_make),
791 KDBUS_CMD_EP_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_ep_make),
792 KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_hello),
794 KDBUS_CMD_MSG_SEND = _IOW (KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg),
795 KDBUS_CMD_MSG_RECV = _IOR (KDBUS_IOC_MAGIC, 0x41, __u64 *),
796 KDBUS_CMD_FREE = _IOW (KDBUS_IOC_MAGIC, 0x42, __u64 *),
798 KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name),
799 KDBUS_CMD_NAME_RELEASE = _IOW (KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name),
800 KDBUS_CMD_NAME_LIST = _IOWR(KDBUS_IOC_MAGIC, 0x52, struct kdbus_cmd_name_list),
802 KDBUS_CMD_CONN_INFO = _IOWR(KDBUS_IOC_MAGIC, 0x60, struct kdbus_cmd_conn_info),
804 KDBUS_CMD_MATCH_ADD = _IOW (KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_match),
805 KDBUS_CMD_MATCH_REMOVE = _IOW (KDBUS_IOC_MAGIC, 0x71, struct kdbus_cmd_match),
806 KDBUS_CMD_MONITOR = _IOW (KDBUS_IOC_MAGIC, 0x72, struct kdbus_cmd_monitor),
808 KDBUS_CMD_EP_POLICY_SET = _IOW (KDBUS_IOC_MAGIC, 0x80, struct kdbus_cmd_policy),
810 KDBUS_CMD_MEMFD_NEW = _IOR (KDBUS_IOC_MAGIC, 0x90, int *),
811 KDBUS_CMD_MEMFD_SIZE_GET = _IOR (KDBUS_IOC_MAGIC, 0x91, __u64 *),
812 KDBUS_CMD_MEMFD_SIZE_SET = _IOW (KDBUS_IOC_MAGIC, 0x92, __u64 *),
813 KDBUS_CMD_MEMFD_SEAL_GET = _IOR (KDBUS_IOC_MAGIC, 0x93, int *),
814 KDBUS_CMD_MEMFD_SEAL_SET = _IO (KDBUS_IOC_MAGIC, 0x94),
818 * errno - api error codes
819 * @E2BIG: A message contains too many records or items.
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: A well-known bus name is already taken by another
829 * @ECOMM: A peer does not accept the file descriptors addressed
831 * @EDESTADDRREQ: The well-known bus name is required but missing.
832 * @EDOM: The size of data does not match the expectations. Used
833 * for the size of the bloom filter bit field.
834 * @EEXIST: A requested namespace, bus or endpoint with the same
835 * name already exists. A specific data type, which is
836 * only expected once, is provided multiple times.
837 * @EFAULT: The supplied memory could not be accessed, or the data
838 * is not properly aligned.
839 * @EINVAL: The provided data does not match its type or other
840 * expectations, like a string which is not NUL terminated,
841 * or a string length that points behind the first
842 * \0-byte in the string.
843 * @EMEDIUMTYPE: A file descriptor which is not a kdbus memfd was
844 * refused to send as KDBUS_MSG_PAYLOAD_MEMFD.
845 * @EMFILE: Too many file descriptors have been supplied with a
847 * @EMSGSIZE: The supplied data is larger than the allowed maximum
849 * @ENAMETOOLONG: The requested name is larger than the allowed maximum
851 * @ENOBUFS: There is no space left for the submitted data to fit
852 * into the receiver's pool.
853 * @ENOMEM: Out of memory.
854 * @ENOSYS: The requested functionality is not available.
855 * @ENOTCONN: The addressed peer is not an active connection.
856 * @ENOTSUPP: The feature negotiation failed, a not supported feature
857 * was requested, or an unknown item type was received.
858 * @ENOTTY: An unknown ioctl command was received.
859 * @ENOTUNIQ: A specific data type was addressed to a broadcast
860 * address, but only direct addresses support this kind of
862 * @ENXIO: A unique address does not exist.
863 * @EPERM: The policy prevented an operation. The requested
864 * resource is owned by another entity.
865 * @ESHUTDOWN: The connection is currently shutting down, no further
866 * operations are possible.
867 * @ESRCH: A requested well-known bus name is not found.
868 * @ETXTBSY: A kdbus memfd file cannot be sealed or the seal removed,
869 * because it is shared with other processes or still
871 * @EXFULL: The size limits in the pool are reached, no data of
872 * the size tried to submit can be queued.