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_WELL_KNOWN_NAME (0)
26 #define KDBUS_MATCH_SRC_ID_ANY (~0ULL)
27 #define KDBUS_DST_ID_BROADCAST (~0ULL)
29 /* Common first elements in a structure which are used to iterate over
30 * a list of elements. */
31 #define KDBUS_PART_HEADER \
37 /* Message sent from kernel to userspace, when the owner or starter of
38 * a well-known name changes */
39 struct kdbus_manager_msg_name_change {
42 __u64 flags; /* 0 or (possibly?) KDBUS_NAME_IN_QUEUE */
46 struct kdbus_manager_msg_id_change {
48 __u64 flags; /* The kernel flags field from KDBUS_HELLO */
57 /* The starttime of the process PID. This is useful to detect
58 PID overruns from the client side. i.e. if you use the PID to
59 look something up in /proc/$PID/ you can afterwards check the
60 starttime field of it to ensure you didn't run into a PID
70 struct kdbus_timestamp {
88 /* Message Item Types */
92 /* Filled in by userspace */
93 KDBUS_MSG_PAYLOAD_VEC, /* .data_vec, reference to memory area */
94 KDBUS_MSG_PAYLOAD_OFF, /* .data_vec, reference to memory area */
95 KDBUS_MSG_PAYLOAD_MEMFD, /* file descriptor of a special data file */
96 KDBUS_MSG_FDS, /* .data_fds of file descriptors */
97 KDBUS_MSG_BLOOM, /* for broadcasts, carries bloom filter blob in .data */
98 KDBUS_MSG_DST_NAME, /* destination's well-known name, in .str */
99 KDBUS_MSG_PRIORITY, /* queue priority for message */
101 /* Filled in by kernelspace */
102 KDBUS_MSG_SRC_NAMES = 0x400,/* NUL separated string list with well-known names of source */
103 KDBUS_MSG_TIMESTAMP, /* .timestamp */
104 KDBUS_MSG_SRC_CREDS, /* .creds */
105 KDBUS_MSG_SRC_PID_COMM, /* optional, in .str */
106 KDBUS_MSG_SRC_TID_COMM, /* optional, in .str */
107 KDBUS_MSG_SRC_EXE, /* optional, in .str */
108 KDBUS_MSG_SRC_CMDLINE, /* optional, in .str (a chain of NUL str) */
109 KDBUS_MSG_SRC_CGROUP, /* optional, in .str */
110 KDBUS_MSG_SRC_CAPS, /* caps data blob, in .data */
111 KDBUS_MSG_SRC_SECLABEL, /* NUL terminated string, in .str */
112 KDBUS_MSG_SRC_AUDIT, /* .audit */
114 /* Special messages from kernel, consisting of one and only one of these data blocks */
115 KDBUS_MSG_NAME_ADD = 0x800,/* .name_change */
116 KDBUS_MSG_NAME_REMOVE, /* .name_change */
117 KDBUS_MSG_NAME_CHANGE, /* .name_change */
118 KDBUS_MSG_ID_ADD, /* .id_change */
119 KDBUS_MSG_ID_REMOVE, /* .id_change */
120 KDBUS_MSG_REPLY_TIMEOUT, /* empty, but .reply_cookie in .kdbus_msg is filled in */
121 KDBUS_MSG_REPLY_DEAD, /* dito */
125 * struct kdbus_item - chain of data blocks
127 * size: overall data record size
128 * type: kdbus_item type of data
143 struct kdbus_vec vec;
145 /* process credentials and properties*/
146 struct kdbus_creds creds;
147 struct kdbus_audit audit;
148 struct kdbus_timestamp timestamp;
150 /* specific fields */
151 struct kdbus_memfd memfd;
153 struct kdbus_manager_msg_name_change name_change;
154 struct kdbus_manager_msg_id_change id_change;
159 KDBUS_MSG_FLAGS_EXPECT_REPLY = 1 << 0,
160 KDBUS_MSG_FLAGS_NO_AUTO_START = 1 << 1,
164 KDBUS_PAYLOAD_KERNEL,
165 KDBUS_PAYLOAD_DBUS1 = 0x4442757356657231ULL, /* 'DBusVer1' */
166 KDBUS_PAYLOAD_GVARIANT = 0x4756617269616e74ULL, /* 'GVariant' */
173 * dst_id: destination id
174 * flags: KDBUS_MSG_FLAGS_*
175 * items: data records
178 * src_id: who sent the message
183 __u64 dst_id; /* connection, 0 == name in data, ~0 broadcast */
184 __u64 src_id; /* connection, 0 == kernel */
185 __u64 payload_type; /* 'DBusVer1', 'GVariant', ... */
186 __u64 cookie; /* userspace-supplied cookie */
188 __u64 cookie_reply; /* cookie we reply to */
189 __u64 timeout_ns; /* timespan to wait for reply */
191 struct kdbus_item items[0];
201 _KDBUS_POLICY_ACCESS_NULL,
202 KDBUS_POLICY_ACCESS_USER,
203 KDBUS_POLICY_ACCESS_GROUP,
204 KDBUS_POLICY_ACCESS_WORLD,
208 KDBUS_POLICY_RECV = 1 << 2,
209 KDBUS_POLICY_SEND = 1 << 1,
210 KDBUS_POLICY_OWN = 1 << 0,
213 struct kdbus_policy_access {
214 __u64 type; /* USER, GROUP, WORLD */
215 __u64 bits; /* RECV, SEND, OWN */
216 __u64 id; /* uid, gid, 0 */
219 //FIXME: convert access to access[]
220 struct kdbus_policy {
224 struct kdbus_policy_access access;
228 /* A series of KDBUS_POLICY_NAME, plus one or more KDBUS_POLICY_ACCESS */
229 struct kdbus_cmd_policy {
231 struct kdbus_policy policies[0];
234 /* Flags for struct kdbus_cmd_hello */
236 KDBUS_HELLO_STARTER = 1 << 0,
237 KDBUS_HELLO_ACCEPT_FD = 1 << 1,
239 /* The following have an effect on directed messages only --
240 * not for broadcasts */
241 KDBUS_HELLO_ATTACH_COMM = 1 << 10,
242 KDBUS_HELLO_ATTACH_EXE = 1 << 11,
243 KDBUS_HELLO_ATTACH_CMDLINE = 1 << 12,
244 KDBUS_HELLO_ATTACH_CGROUP = 1 << 13,
245 KDBUS_HELLO_ATTACH_CAPS = 1 << 14,
246 KDBUS_HELLO_ATTACH_SECLABEL = 1 << 15,
247 KDBUS_HELLO_ATTACH_AUDIT = 1 << 16,
250 struct kdbus_cmd_hello {
253 /* userspace → kernel, kernel → userspace */
254 __u64 conn_flags; /* userspace specifies its
255 * capabilities and more, kernel
256 * returns its capabilites and
257 * more. Kernel might refuse client's
258 * capabilities by returning an error
259 * from KDBUS_HELLO */
261 /* kernel → userspace */
262 __u64 bus_flags; /* this is .flags copied verbatim from
263 * from original KDBUS_CMD_BUS_MAKE
264 * ioctl. It's intended to be useful
265 * to do negotiation of features of
266 * the payload that is transfreted. */
267 __u64 id; /* id assigned to this connection */
268 __u64 bloom_size; /* The bloom filter size chosen by the
270 __u64 pool_size; /* maximum size of pool buffer */
271 struct kdbus_item items[0];
274 /* Flags for kdbus_cmd_{bus,ep,ns}_make */
276 KDBUS_MAKE_ACCESS_GROUP = 1 << 0,
277 KDBUS_MAKE_ACCESS_WORLD = 1 << 1,
278 KDBUS_MAKE_POLICY_OPEN = 1 << 2,
281 /* Items to append to kdbus_cmd_{bus,ep,ns}_make */
285 KDBUS_MAKE_CGROUP, /* the cgroup hierarchy ID for which to attach
286 * cgroup membership paths to messages.
287 * FIXME: remove, use *the* hierarchy */
288 KDBUS_MAKE_CRED, /* allow translator services which connect
289 * to the bus on behalf of somebody else,
290 * allow specifiying the credentials of the
291 * client to connect on behalf on. Needs
295 struct kdbus_cmd_bus_make {
297 __u64 flags; /* userspace → kernel, kernel → userspace
298 * When creating a bus feature
299 * kernel negotiation. */
300 __u64 bus_flags; /* userspace → kernel
301 * When a bus is created this value is
302 * copied verbatim into the bus
303 * structure and returned from
304 * KDBUS_CMD_HELLO, later */
305 __u64 bloom_size; /* size of the bloom filter for this bus */
306 struct kdbus_item items[0];
309 struct kdbus_cmd_ep_make {
311 __u64 flags; /* userspace → kernel, kernel → userspace
312 * When creating an entry point
313 * feature kernel negotiation done the
315 * KDBUS_CMD_BUS_MAKE. Unused for
317 struct kdbus_item items[0];
320 struct kdbus_cmd_ns_make {
322 __u64 flags; /* userspace → kernel, kernel → userspace
323 * When creating an entry point
324 * feature kernel negotiation done the
326 * KDBUS_CMD_BUS_MAKE. Unused for
328 struct kdbus_item items[0];
332 /* userspace → kernel */
333 KDBUS_NAME_REPLACE_EXISTING = 1 << 0,
334 KDBUS_NAME_QUEUE = 1 << 1,
335 KDBUS_NAME_ALLOW_REPLACEMENT = 1 << 2,
337 /* kernel → userspace */
338 KDBUS_NAME_IN_QUEUE = 1 << 16,
341 /* We allow (de)regestration of names of other peers */
342 struct kdbus_cmd_name {
350 struct kdbus_cmd_names {
352 struct kdbus_cmd_name names[0];
356 _KDBUS_NAME_INFO_ITEM_NULL,
357 KDBUS_NAME_INFO_ITEM_NAME, /* userspace → kernel */
358 KDBUS_NAME_INFO_ITEM_SECLABEL, /* kernel → userspace */
359 KDBUS_NAME_INFO_ITEM_AUDIT, /* kernel → userspace */
362 struct kdbus_cmd_name_info {
363 __u64 size; /* overall size of info */
365 __u64 id; /* either ID, or 0 and _ITEM_NAME follows */
366 struct kdbus_creds creds;
367 struct kdbus_item items[0]; /* list of item records */
372 KDBUS_MATCH_BLOOM, /* Matches a mask blob against KDBUS_MSG_BLOOM */
373 KDBUS_MATCH_SRC_NAME, /* Matches a name string against KDBUS_MSG_SRC_NAMES */
374 KDBUS_MATCH_NAME_ADD, /* Matches a name string against KDBUS_MSG_NAME_ADD */
375 KDBUS_MATCH_NAME_REMOVE, /* Matches a name string against KDBUS_MSG_NAME_REMOVE */
376 KDBUS_MATCH_NAME_CHANGE, /* Matches a name string against KDBUS_MSG_NAME_CHANGE */
377 KDBUS_MATCH_ID_ADD, /* Matches an ID against KDBUS_MSG_ID_ADD */
378 KDBUS_MATCH_ID_REMOVE, /* Matches an ID against KDBUS_MSG_ID_REMOVE */
381 struct kdbus_cmd_match {
383 __u64 id; /* We allow registration/deregestration of matches for other peers */
384 __u64 cookie; /* userspace supplied cookie; when removing; kernel deletes everything with same cookie */
385 __u64 src_id; /* ~0: any. other: exact unique match */
386 struct kdbus_item items[0];
389 struct kdbus_cmd_monitor {
390 __u64 id; /* We allow setting the monitor flag of other peers */
391 unsigned int enable; /* A boolean to enable/disable monitoring */
395 * control nodes: unset
396 * bus owner (via KDBUS_CMD_BUS_MAKE)
397 * ns owner (via KDBUS_CMD_NS_MAKE)
400 * connected (via KDBUS_CMD_HELLO)
401 * starter (via KDBUS_CMD_HELLO with KDBUS_CMD_HELLO_STARTER)
402 * ep owner (via KDBUS_CMD_EP_MAKE)
405 /* kdbus control node commands: require unset state */
406 KDBUS_CMD_BUS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_bus_make),
407 KDBUS_CMD_NS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_ns_make),
409 /* kdbus ep node commands: require unset state */
410 KDBUS_CMD_EP_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_ep_make),
411 KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_hello),
413 /* kdbus ep node commands: require connected state */
414 KDBUS_CMD_MSG_SEND = _IOWR(KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg),
415 KDBUS_CMD_MSG_RECV = _IOWR(KDBUS_IOC_MAGIC, 0x41, __u64 *),
416 KDBUS_CMD_MSG_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x42, __u64 *),
418 KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name),
419 KDBUS_CMD_NAME_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name),
420 KDBUS_CMD_NAME_LIST = _IOWR(KDBUS_IOC_MAGIC, 0x52, struct kdbus_cmd_names),
421 KDBUS_CMD_NAME_QUERY = _IOWR(KDBUS_IOC_MAGIC, 0x53, struct kdbus_cmd_name_info),
423 KDBUS_CMD_MATCH_ADD = _IOWR(KDBUS_IOC_MAGIC, 0x60, struct kdbus_cmd_match),
424 KDBUS_CMD_MATCH_REMOVE = _IOWR(KDBUS_IOC_MAGIC, 0x61, struct kdbus_cmd_match),
425 KDBUS_CMD_MONITOR = _IOWR(KDBUS_IOC_MAGIC, 0x62, struct kdbus_cmd_monitor),
427 /* kdbus ep node commands: require ep owner state */
428 KDBUS_CMD_EP_POLICY_SET = _IOWR(KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_policy),
430 /* kdbus memfd commands: */
431 KDBUS_CMD_MEMFD_NEW = _IOWR(KDBUS_IOC_MAGIC, 0x80, int *),
432 KDBUS_CMD_MEMFD_SIZE_GET = _IOWR(KDBUS_IOC_MAGIC, 0x81, __u64 *),
433 KDBUS_CMD_MEMFD_SIZE_SET = _IOWR(KDBUS_IOC_MAGIC, 0x82, __u64 *),
434 KDBUS_CMD_MEMFD_SEAL_GET = _IOWR(KDBUS_IOC_MAGIC, 0x83, int *),
435 KDBUS_CMD_MEMFD_SEAL_SET = _IOWR(KDBUS_IOC_MAGIC, 0x84, int),