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
25 /* Message sent from kernel to userspace, when the owner or starter of
26 * a well-known name changes */
27 struct kdbus_manager_msg_name_change {
30 __u64 flags; /* 0 or (possibly?) KDBUS_NAME_IN_QUEUE */
34 struct kdbus_manager_msg_id_change {
36 __u64 flags; /* The kernel flags field from KDBUS_HELLO */
45 /* The starttime of the process PID. This is useful to detect
46 PID overruns from the client side. i.e. if you use the PID to
47 look something up in /proc/$PID/ you can afterwards check the
48 starttime field of it to ensure you didn't run into a PID
58 struct kdbus_timestamp {
63 #define KDBUS_SRC_ID_KERNEL (0)
64 #define KDBUS_DST_ID_WELL_KNOWN_NAME (0)
65 #define KDBUS_MATCH_SRC_ID_ANY (~0ULL)
66 #define KDBUS_DST_ID_BROADCAST (~0ULL)
68 /* Message Item Types */
72 /* Filled in by userspace */
73 KDBUS_MSG_PAYLOAD, /* .data, inline memory */
74 KDBUS_MSG_PAYLOAD_VEC, /* .data_vec, reference to memory area */
75 KDBUS_MSG_UNIX_FDS, /* .data_fds of file descriptors */
76 KDBUS_MSG_BLOOM, /* for broadcasts, carries bloom filter blob in .data */
77 KDBUS_MSG_DST_NAME, /* destination's well-known name, in .str */
79 /* Filled in by kernelspace */
80 KDBUS_MSG_SRC_NAMES = 0x200,/* NUL separated string list with well-known names of source */
81 KDBUS_MSG_TIMESTAMP, /* .timestamp */
82 KDBUS_MSG_SRC_CREDS, /* .creds */
83 KDBUS_MSG_SRC_PID_COMM, /* optional, in .str */
84 KDBUS_MSG_SRC_TID_COMM, /* optional, in .str */
85 KDBUS_MSG_SRC_EXE, /* optional, in .str */
86 KDBUS_MSG_SRC_CMDLINE, /* optional, in .str (a chain of NUL str) */
87 KDBUS_MSG_SRC_CGROUP, /* optional, in .str */
88 KDBUS_MSG_SRC_CAPS, /* caps data blob, in .data */
89 KDBUS_MSG_SRC_SECLABEL, /* NUL terminated string, in .str */
90 KDBUS_MSG_SRC_AUDIT, /* .audit */
92 /* Special messages from kernel, consisting of one and only one of these data blocks */
93 KDBUS_MSG_NAME_ADD = 0x400,/* .name_change */
94 KDBUS_MSG_NAME_REMOVE, /* .name_change */
95 KDBUS_MSG_NAME_CHANGE, /* .name_change */
96 KDBUS_MSG_ID_ADD, /* .id_change */
97 KDBUS_MSG_ID_REMOVE, /* .id_change */
98 KDBUS_MSG_REPLY_TIMEOUT, /* empty, but .reply_cookie in .kdbus_msg is filled in */
99 KDBUS_MSG_REPLY_DEAD, /* dito */
103 KDBUS_VEC_ALIGNED = 1 << 0,
113 * struct kdbus_item - chain of data blocks
115 * size: overall data record size
116 * type: kdbus_item type of data
132 struct kdbus_vec vec;
134 /* process credentials and properties*/
135 struct kdbus_creds creds;
136 struct kdbus_audit audit;
137 struct kdbus_timestamp timestamp;
139 /* specific fields */
141 struct kdbus_manager_msg_name_change name_change;
142 struct kdbus_manager_msg_id_change id_change;
147 KDBUS_MSG_FLAGS_EXPECT_REPLY = 1 << 0,
148 KDBUS_MSG_FLAGS_NO_AUTO_START = 1 << 1,
153 KDBUS_PAYLOAD_DBUS1 = 0x4442757356657231ULL, /* 'DBusVer1' */
154 KDBUS_PAYLOAD_GVARIANT = 0x4756617269616e74ULL, /* 'GVariant' */
161 * dst_id: destination id
162 * flags: KDBUS_MSG_FLAGS_*
163 * items: data records
166 * src_id: who sent the message
171 __u64 dst_id; /* connection, 0 == name in data, ~0 broadcast */
172 __u64 src_id; /* connection, 0 == kernel */
173 __u64 payload_type; /* 'DBusVer1', 'GVariant', ... */
174 __u64 cookie; /* userspace-supplied cookie */
176 __u64 cookie_reply; /* cookie we reply to */
177 __u64 timeout_ns; /* timespan to wait for reply */
179 struct kdbus_item items[0];
189 KDBUS_POLICY_ACCESS_NULL,
190 KDBUS_POLICY_ACCESS_USER,
191 KDBUS_POLICY_ACCESS_GROUP,
192 KDBUS_POLICY_ACCESS_WORLD,
196 KDBUS_POLICY_RECV = 1 << 2,
197 KDBUS_POLICY_SEND = 1 << 1,
198 KDBUS_POLICY_OWN = 1 << 0,
201 struct kdbus_policy {
203 __u64 type; /* NAME or ACCESS */
207 __u32 type; /* USER, GROUP, WORLD */
208 __u32 bits; /* RECV, SEND, OWN */
209 __u64 id; /* uid, gid, 0 */
214 struct kdbus_cmd_policy {
216 __u8 buffer[0]; /* a series of KDBUS_POLICY_NAME plus one or
217 * more KDBUS_POLICY_ACCESS each. */
220 /* Flags for struct kdbus_cmd_hello */
222 KDBUS_HELLO_STARTER = 1 << 0,
223 KDBUS_HELLO_ACCEPT_FD = 1 << 1,
225 /* The following have an effect on directed messages only --
226 * not for broadcasts */
227 KDBUS_HELLO_ATTACH_COMM = 1 << 10,
228 KDBUS_HELLO_ATTACH_EXE = 1 << 11,
229 KDBUS_HELLO_ATTACH_CMDLINE = 1 << 12,
230 KDBUS_HELLO_ATTACH_CGROUP = 1 << 13,
231 KDBUS_HELLO_ATTACH_CAPS = 1 << 14,
232 KDBUS_HELLO_ATTACH_SECLABEL = 1 << 15,
233 KDBUS_HELLO_ATTACH_AUDIT = 1 << 16,
236 /* Items to append to struct kdbus_cmd_hello */
241 struct kdbus_cmd_hello {
244 /* userspace → kernel, kernel → userspace */
245 __u64 conn_flags; /* userspace specifies its
246 * capabilities and more, kernel
247 * returns its capabilites and
248 * more. Kernel might refuse client's
249 * capabilities by returning an error
250 * from KDBUS_HELLO */
252 /* kernel → userspace */
253 __u64 bus_flags; /* this is .flags copied verbatim from
254 * from original KDBUS_CMD_BUS_MAKE
255 * ioctl. It's intended to be useful
256 * to do negotiation of features of
257 * the payload that is transfreted. */
258 __u64 id; /* id assigned to this connection */
259 __u64 bloom_size; /* The bloom filter size chosen by the
261 struct kdbus_item items[0];
264 /* Flags for kdbus_cmd_{bus,ep,ns}_make */
266 KDBUS_MAKE_ACCESS_GROUP = 1 << 0,
267 KDBUS_MAKE_ACCESS_WORLD = 1 << 1,
268 KDBUS_MAKE_POLICY_OPEN = 1 << 2,
271 /* Items to append to kdbus_cmd_{bus,ep,ns}_make */
275 KDBUS_MAKE_CGROUP, /* the cgroup hierarchy ID for which to attach
276 * cgroup membership paths * to messages. */
277 KDBUS_MAKE_CRED, /* allow translator services which connect
278 * to the bus on behalf of somebody else,
279 * allow specifying the credentials of the
280 * client to connect on behalf on. Needs
284 struct kdbus_cmd_bus_make {
286 __u64 flags; /* userspace → kernel, kernel → userspace
287 * When creating a bus feature
288 * kernel negotiation. */
289 __u64 bus_flags; /* userspace → kernel
290 * When a bus is created this value is
291 * copied verbatim into the bus
292 * structure and returned from
293 * KDBUS_CMD_HELLO, later */
294 __u64 bloom_size; /* size of the bloom filter for this bus */
295 struct kdbus_item items[0];
299 struct kdbus_cmd_ep_make {
301 __u64 flags; /* userspace → kernel, kernel → userspace
302 * When creating an entry point
303 * feature kernel negotiation done the
305 * KDBUS_CMD_BUS_MAKE. Unused for
307 struct kdbus_item items[0];
310 struct kdbus_cmd_ns_make {
312 __u64 flags; /* userspace → kernel, kernel → userspace
313 * When creating an entry point
314 * feature kernel negotiation done the
316 * KDBUS_CMD_BUS_MAKE. Unused for
318 struct kdbus_item items[0];
322 /* userspace → kernel */
323 KDBUS_NAME_REPLACE_EXISTING = 1 << 0,
324 KDBUS_NAME_QUEUE = 1 << 1,
325 KDBUS_NAME_ALLOW_REPLACEMENT = 1 << 2,
327 /* kernel → userspace */
328 KDBUS_NAME_IN_QUEUE = 1 << 16,
331 struct kdbus_cmd_name {
334 __u64 id; /* We allow registration/deregestration of names of other peers */
339 struct kdbus_cmd_names {
341 struct kdbus_cmd_name names[0];
345 KDBUS_NAME_INFO_ITEM_NULL,
346 KDBUS_NAME_INFO_ITEM_NAME, /* userspace → kernel */
347 KDBUS_NAME_INFO_ITEM_SECLABEL, /* kernel → userspace */
348 KDBUS_NAME_INFO_ITEM_AUDIT, /* kernel → userspace */
351 struct kdbus_cmd_name_info {
352 __u64 size; /* overall size of info */
354 __u64 id; /* either ID, or 0 and _ITEM_NAME follows */
355 struct kdbus_creds creds;
356 struct kdbus_item items[0]; /* list of item records */
361 KDBUS_MATCH_BLOOM, /* Matches a mask blob against KDBUS_MSG_BLOOM */
362 KDBUS_MATCH_SRC_NAME, /* Matches a name string against KDBUS_MSG_SRC_NAMES */
363 KDBUS_MATCH_NAME_ADD, /* Matches a name string against KDBUS_MSG_NAME_ADD */
364 KDBUS_MATCH_NAME_REMOVE, /* Matches a name string against KDBUS_MSG_NAME_REMOVE */
365 KDBUS_MATCH_NAME_CHANGE, /* Matches a name string against KDBUS_MSG_NAME_CHANGE */
366 KDBUS_MATCH_ID_ADD, /* Matches an ID against KDBUS_MSG_ID_ADD */
367 KDBUS_MATCH_ID_REMOVE, /* Matches an ID against KDBUS_MSG_ID_REMOVE */
370 struct kdbus_cmd_match {
372 __u64 id; /* We allow registration/deregestration of matches for other peers */
373 __u64 cookie; /* userspace supplied cookie; when removing; kernel deletes everything with same cookie */
374 __u64 src_id; /* ~0: any. other: exact unique match */
375 struct kdbus_item items[0];
378 struct kdbus_cmd_monitor {
379 __u64 id; /* We allow setting the monitor flag of other peers */
380 unsigned int enabled; /* A boolean to enable/disable monitoring */
384 * control nodes: unset
385 * bus owner (via KDBUS_CMD_BUS_MAKE)
386 * ns owner (via KDBUS_CMD_NS_MAKE)
389 * connected (via KDBUS_CMD_HELLO)
390 * starter (via KDBUS_CMD_HELLO with KDBUS_CMD_HELLO_STARTER)
391 * ep owner (via KDBUS_CMD_EP_MAKE)
394 /* kdbus control node commands: require unset state */
395 KDBUS_CMD_BUS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_bus_make),
396 KDBUS_CMD_NS_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_ns_make),
398 /* kdbus ep node commands: require unset state */
399 KDBUS_CMD_EP_MAKE = _IOWR(KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_ep_make),
400 KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_hello),
402 /* kdbus ep node commands: require connected state */
403 KDBUS_CMD_MSG_SEND = _IOWR(KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg),
404 KDBUS_CMD_MSG_RECV = _IOWR(KDBUS_IOC_MAGIC, 0x41, struct kdbus_msg),
406 KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name),
407 KDBUS_CMD_NAME_RELEASE = _IOWR(KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name),
408 KDBUS_CMD_NAME_LIST = _IOWR(KDBUS_IOC_MAGIC, 0x52, struct kdbus_cmd_names),
409 KDBUS_CMD_NAME_QUERY = _IOWR(KDBUS_IOC_MAGIC, 0x53, struct kdbus_cmd_name_info),
411 KDBUS_CMD_MATCH_ADD = _IOWR(KDBUS_IOC_MAGIC, 0x60, struct kdbus_cmd_match),
412 KDBUS_CMD_MATCH_REMOVE = _IOWR(KDBUS_IOC_MAGIC, 0x61, struct kdbus_cmd_match),
413 KDBUS_CMD_MONITOR = _IOWR(KDBUS_IOC_MAGIC, 0x62, struct kdbus_cmd_monitor),
415 /* kdbus ep node commands: require ep owner state */
416 KDBUS_CMD_EP_POLICY_SET = _IOWR(KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_policy),