Skip to content
Find file
Fetching contributors…
Cannot retrieve contributors at this time
980 lines (926 sloc) 30.8 KB
/*
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*/
#ifndef _KDBUS_UAPI_H_
#define _KDBUS_UAPI_H_
#include <linux/ioctl.h>
#include <linux/types.h>
#define KDBUS_IOCTL_MAGIC 0x95
#define KDBUS_SRC_ID_KERNEL (0)
#define KDBUS_DST_ID_NAME (0)
#define KDBUS_MATCH_ID_ANY (~0ULL)
#define KDBUS_DST_ID_BROADCAST (~0ULL)
#define KDBUS_FLAG_NEGOTIATE (1ULL << 63)
/**
* struct kdbus_notify_id_change - name registry change message
* @id: New or former owner of the name
* @flags: flags field from KDBUS_HELLO_*
*
* Sent from kernel to userspace when the owner or activator of
* a well-known name changes.
*
* Attached to:
* KDBUS_ITEM_ID_ADD
* KDBUS_ITEM_ID_REMOVE
*/
struct kdbus_notify_id_change {
__u64 id;
__u64 flags;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_notify_name_change - name registry change message
* @old_id: ID and flags of former owner of a name
* @new_id: ID and flags of new owner of a name
* @name: Well-known name
*
* Sent from kernel to userspace when the owner or activator of
* a well-known name changes.
*
* Attached to:
* KDBUS_ITEM_NAME_ADD
* KDBUS_ITEM_NAME_REMOVE
* KDBUS_ITEM_NAME_CHANGE
*/
struct kdbus_notify_name_change {
struct kdbus_notify_id_change old_id;
struct kdbus_notify_id_change new_id;
char name[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_creds - process credentials
* @uid: User ID
* @euid: Effective UID
* @suid: Saved UID
* @fsuid: Filesystem UID
* @gid: Group ID
* @egid: Effective GID
* @sgid: Saved GID
* @fsgid: Filesystem GID
*
* Attached to:
* KDBUS_ITEM_CREDS
*/
struct kdbus_creds {
__u64 uid;
__u64 euid;
__u64 suid;
__u64 fsuid;
__u64 gid;
__u64 egid;
__u64 sgid;
__u64 fsgid;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_pids - process identifiers
* @pid: Process ID
* @tid: Thread ID
* @ppid: Parent process ID
*
* The PID and TID of a process.
*
* Attached to:
* KDBUS_ITEM_PIDS
*/
struct kdbus_pids {
__u64 pid;
__u64 tid;
__u64 ppid;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_caps - process capabilities
* @last_cap: Highest currently known capability bit
* @caps: Variable number of 32-bit capabilities flags
*
* Contains a variable number of 32-bit capabilities flags.
*
* Attached to:
* KDBUS_ITEM_CAPS
*/
struct kdbus_caps {
__u32 last_cap;
__u32 caps[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_audit - audit information
* @sessionid: The audit session ID
* @loginuid: The audit login uid
*
* Attached to:
* KDBUS_ITEM_AUDIT
*/
struct kdbus_audit {
__u32 sessionid;
__u32 loginuid;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_timestamp
* @seqnum: Global per-domain message sequence number
* @monotonic_ns: Monotonic timestamp, in nanoseconds
* @realtime_ns: Realtime timestamp, in nanoseconds
*
* Attached to:
* KDBUS_ITEM_TIMESTAMP
*/
struct kdbus_timestamp {
__u64 seqnum;
__u64 monotonic_ns;
__u64 realtime_ns;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_vec - I/O vector for kdbus payload items
* @size: The size of the vector
* @address: Memory address of data buffer
* @offset: Offset in the in-message payload memory,
* relative to the message head
*
* Attached to:
* KDBUS_ITEM_PAYLOAD_VEC, KDBUS_ITEM_PAYLOAD_OFF
*/
struct kdbus_vec {
__u64 size;
union {
__u64 address;
__u64 offset;
};
} __attribute__((__aligned__(8)));
/**
* struct kdbus_bloom_parameter - bus-wide bloom parameters
* @size: Size of the bit field in bytes (m / 8)
* @n_hash: Number of hash functions used (k)
*/
struct kdbus_bloom_parameter {
__u64 size;
__u64 n_hash;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_bloom_filter - bloom filter containing n elements
* @generation: Generation of the element set in the filter
* @data: Bit field, multiple of 8 bytes
*/
struct kdbus_bloom_filter {
__u64 generation;
__u64 data[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_memfd - a kdbus memfd
* @start: The offset into the memfd where the segment starts
* @size: The size of the memfd segment
* @fd: The file descriptor number
* @__pad: Padding to ensure proper alignment and size
*
* Attached to:
* KDBUS_ITEM_PAYLOAD_MEMFD
*/
struct kdbus_memfd {
__u64 start;
__u64 size;
int fd;
__u32 __pad;
} __attribute__((__aligned__(8)));
/**
* struct kdbus_name - a registered well-known name with its flags
* @flags: Flags from KDBUS_NAME_*
* @name: Well-known name
*
* Attached to:
* KDBUS_ITEM_OWNED_NAME
*/
struct kdbus_name {
__u64 flags;
char name[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_policy_access_type - permissions of a policy record
* @_KDBUS_POLICY_ACCESS_NULL: Uninitialized/invalid
* @KDBUS_POLICY_ACCESS_USER: Grant access to a uid
* @KDBUS_POLICY_ACCESS_GROUP: Grant access to gid
* @KDBUS_POLICY_ACCESS_WORLD: World-accessible
*/
enum kdbus_policy_access_type {
_KDBUS_POLICY_ACCESS_NULL,
KDBUS_POLICY_ACCESS_USER,
KDBUS_POLICY_ACCESS_GROUP,
KDBUS_POLICY_ACCESS_WORLD,
};
/**
* enum kdbus_policy_access_flags - mode flags
* @KDBUS_POLICY_OWN: Allow to own a well-known name
* Implies KDBUS_POLICY_TALK and KDBUS_POLICY_SEE
* @KDBUS_POLICY_TALK: Allow communication to a well-known name
* Implies KDBUS_POLICY_SEE
* @KDBUS_POLICY_SEE: Allow to see a well-known name
*/
enum kdbus_policy_type {
KDBUS_POLICY_SEE = 0,
KDBUS_POLICY_TALK,
KDBUS_POLICY_OWN,
};
/**
* struct kdbus_policy_access - policy access item
* @type: One of KDBUS_POLICY_ACCESS_* types
* @access: Access to grant
* @id: For KDBUS_POLICY_ACCESS_USER, the uid
* For KDBUS_POLICY_ACCESS_GROUP, the gid
*/
struct kdbus_policy_access {
__u64 type; /* USER, GROUP, WORLD */
__u64 access; /* OWN, TALK, SEE */
__u64 id; /* uid, gid, 0 */
} __attribute__((__aligned__(8)));
/**
* enum kdbus_attach_flags - flags for metadata attachments
* @KDBUS_ATTACH_TIMESTAMP: Timestamp
* @KDBUS_ATTACH_CREDS: Credentials
* @KDBUS_ATTACH_PIDS: PIDs
* @KDBUS_ATTACH_AUXGROUPS: Auxiliary groups
* @KDBUS_ATTACH_NAMES: Well-known names
* @KDBUS_ATTACH_TID_COMM: The "comm" process identifier of the TID
* @KDBUS_ATTACH_PID_COMM: The "comm" process identifier of the PID
* @KDBUS_ATTACH_EXE: The path of the executable
* @KDBUS_ATTACH_CMDLINE: The process command line
* @KDBUS_ATTACH_CGROUP: The croup membership
* @KDBUS_ATTACH_CAPS: The process capabilities
* @KDBUS_ATTACH_SECLABEL: The security label
* @KDBUS_ATTACH_AUDIT: The audit IDs
* @KDBUS_ATTACH_CONN_DESCRIPTION: The human-readable connection name
* @_KDBUS_ATTACH_ALL: All of the above
* @_KDBUS_ATTACH_ANY: Wildcard match to enable any kind of
* metatdata.
*/
enum kdbus_attach_flags {
KDBUS_ATTACH_TIMESTAMP = 1ULL << 0,
KDBUS_ATTACH_CREDS = 1ULL << 1,
KDBUS_ATTACH_PIDS = 1ULL << 2,
KDBUS_ATTACH_AUXGROUPS = 1ULL << 3,
KDBUS_ATTACH_NAMES = 1ULL << 4,
KDBUS_ATTACH_TID_COMM = 1ULL << 5,
KDBUS_ATTACH_PID_COMM = 1ULL << 6,
KDBUS_ATTACH_EXE = 1ULL << 7,
KDBUS_ATTACH_CMDLINE = 1ULL << 8,
KDBUS_ATTACH_CGROUP = 1ULL << 9,
KDBUS_ATTACH_CAPS = 1ULL << 10,
KDBUS_ATTACH_SECLABEL = 1ULL << 11,
KDBUS_ATTACH_AUDIT = 1ULL << 12,
KDBUS_ATTACH_CONN_DESCRIPTION = 1ULL << 13,
_KDBUS_ATTACH_ALL = (1ULL << 14) - 1,
_KDBUS_ATTACH_ANY = ~0ULL
};
/**
* enum kdbus_item_type - item types to chain data in a list
* @_KDBUS_ITEM_NULL: Uninitialized/invalid
* @_KDBUS_ITEM_USER_BASE: Start of user items
* @KDBUS_ITEM_NEGOTIATE: Negotiate supported items
* @KDBUS_ITEM_PAYLOAD_VEC: Vector to data
* @KDBUS_ITEM_PAYLOAD_OFF: Data at returned offset to message head
* @KDBUS_ITEM_PAYLOAD_MEMFD: Data as sealed memfd
* @KDBUS_ITEM_FDS: Attached file descriptors
* @KDBUS_ITEM_CANCEL_FD: FD used to cancel a synchronous
* operation by writing to it from
* userspace
* @KDBUS_ITEM_BLOOM_PARAMETER: Bus-wide bloom parameters, used with
* KDBUS_CMD_BUS_MAKE, carries a
* struct kdbus_bloom_parameter
* @KDBUS_ITEM_BLOOM_FILTER: Bloom filter carried with a message,
* used to match against a bloom mask of a
* connection, carries a struct
* kdbus_bloom_filter
* @KDBUS_ITEM_BLOOM_MASK: Bloom mask used to match against a
* message'sbloom filter
* @KDBUS_ITEM_DST_NAME: Destination's well-known name
* @KDBUS_ITEM_MAKE_NAME: Name of domain, bus, endpoint
* @KDBUS_ITEM_ATTACH_FLAGS_SEND: Attach-flags, used for updating which
* metadata a connection opts in to send
* @KDBUS_ITEM_ATTACH_FLAGS_RECV: Attach-flags, used for updating which
* metadata a connection requests to
* receive for each reeceived message
* @KDBUS_ITEM_ID: Connection ID
* @KDBUS_ITEM_NAME: Well-know name with flags
* @_KDBUS_ITEM_ATTACH_BASE: Start of metadata attach items
* @KDBUS_ITEM_TIMESTAMP: Timestamp
* @KDBUS_ITEM_CREDS: Process credentials
* @KDBUS_ITEM_PIDS: Process identifiers
* @KDBUS_ITEM_AUXGROUPS: Auxiliary process groups
* @KDBUS_ITEM_OWNED_NAME: A name owned by the associated
* connection
* @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier
* (Don't trust this, see below.)
* @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier
* (Don't trust this, see below.)
* @KDBUS_ITEM_EXE: The path of the executable
* (Don't trust this, see below.)
* @KDBUS_ITEM_CMDLINE: The process command line
* (Don't trust this, see below.)
* @KDBUS_ITEM_CGROUP: The croup membership
* @KDBUS_ITEM_CAPS: The process capabilities
* @KDBUS_ITEM_SECLABEL: The security label
* @KDBUS_ITEM_AUDIT: The audit IDs
* @KDBUS_ITEM_CONN_DESCRIPTION: The connection's human-readable name
* (debugging)
* @_KDBUS_ITEM_POLICY_BASE: Start of policy items
* @KDBUS_ITEM_POLICY_ACCESS: Policy access block
* @_KDBUS_ITEM_KERNEL_BASE: Start of kernel-generated message items
* @KDBUS_ITEM_NAME_ADD: Notification in kdbus_notify_name_change
* @KDBUS_ITEM_NAME_REMOVE: Notification in kdbus_notify_name_change
* @KDBUS_ITEM_NAME_CHANGE: Notification in kdbus_notify_name_change
* @KDBUS_ITEM_ID_ADD: Notification in kdbus_notify_id_change
* @KDBUS_ITEM_ID_REMOVE: Notification in kdbus_notify_id_change
* @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached
* @KDBUS_ITEM_REPLY_DEAD: Destination died
*
* N.B: The process and thread COMM fields, as well as the CMDLINE and
* EXE fields may be altered by unprivileged processes und should
* hence *not* used for security decisions. Peers should make use of
* these items only for informational purposes, such as generating log
* records.
*/
enum kdbus_item_type {
_KDBUS_ITEM_NULL,
_KDBUS_ITEM_USER_BASE,
KDBUS_ITEM_NEGOTIATE = _KDBUS_ITEM_USER_BASE,
KDBUS_ITEM_PAYLOAD_VEC,
KDBUS_ITEM_PAYLOAD_OFF,
KDBUS_ITEM_PAYLOAD_MEMFD,
KDBUS_ITEM_FDS,
KDBUS_ITEM_CANCEL_FD,
KDBUS_ITEM_BLOOM_PARAMETER,
KDBUS_ITEM_BLOOM_FILTER,
KDBUS_ITEM_BLOOM_MASK,
KDBUS_ITEM_DST_NAME,
KDBUS_ITEM_MAKE_NAME,
KDBUS_ITEM_ATTACH_FLAGS_SEND,
KDBUS_ITEM_ATTACH_FLAGS_RECV,
KDBUS_ITEM_ID,
KDBUS_ITEM_NAME,
/* keep these item types in sync with KDBUS_ATTACH_* flags */
_KDBUS_ITEM_ATTACH_BASE = 0x1000,
KDBUS_ITEM_TIMESTAMP = _KDBUS_ITEM_ATTACH_BASE,
KDBUS_ITEM_CREDS,
KDBUS_ITEM_PIDS,
KDBUS_ITEM_AUXGROUPS,
KDBUS_ITEM_OWNED_NAME,
KDBUS_ITEM_TID_COMM,
KDBUS_ITEM_PID_COMM,
KDBUS_ITEM_EXE,
KDBUS_ITEM_CMDLINE,
KDBUS_ITEM_CGROUP,
KDBUS_ITEM_CAPS,
KDBUS_ITEM_SECLABEL,
KDBUS_ITEM_AUDIT,
KDBUS_ITEM_CONN_DESCRIPTION,
_KDBUS_ITEM_POLICY_BASE = 0x2000,
KDBUS_ITEM_POLICY_ACCESS = _KDBUS_ITEM_POLICY_BASE,
_KDBUS_ITEM_KERNEL_BASE = 0x8000,
KDBUS_ITEM_NAME_ADD = _KDBUS_ITEM_KERNEL_BASE,
KDBUS_ITEM_NAME_REMOVE,
KDBUS_ITEM_NAME_CHANGE,
KDBUS_ITEM_ID_ADD,
KDBUS_ITEM_ID_REMOVE,
KDBUS_ITEM_REPLY_TIMEOUT,
KDBUS_ITEM_REPLY_DEAD,
};
/**
* struct kdbus_item - chain of data blocks
* @size: Overall data record size
* @type: Kdbus_item type of data
* @data: Generic bytes
* @data32: Generic 32 bit array
* @data64: Generic 64 bit array
* @str: Generic string
* @id: Connection ID
* @vec: KDBUS_ITEM_PAYLOAD_VEC
* @creds: KDBUS_ITEM_CREDS
* @audit: KDBUS_ITEM_AUDIT
* @timestamp: KDBUS_ITEM_TIMESTAMP
* @name: KDBUS_ITEM_NAME
* @bloom_parameter: KDBUS_ITEM_BLOOM_PARAMETER
* @bloom_filter: KDBUS_ITEM_BLOOM_FILTER
* @memfd: KDBUS_ITEM_PAYLOAD_MEMFD
* @name_change: KDBUS_ITEM_NAME_ADD
* KDBUS_ITEM_NAME_REMOVE
* KDBUS_ITEM_NAME_CHANGE
* @id_change: KDBUS_ITEM_ID_ADD
* KDBUS_ITEM_ID_REMOVE
* @policy: KDBUS_ITEM_POLICY_ACCESS
*/
struct kdbus_item {
__u64 size;
__u64 type;
union {
__u8 data[0];
__u32 data32[0];
__u64 data64[0];
char str[0];
__u64 id;
struct kdbus_vec vec;
struct kdbus_creds creds;
struct kdbus_pids pids;
struct kdbus_audit audit;
struct kdbus_caps caps;
struct kdbus_timestamp timestamp;
struct kdbus_name name;
struct kdbus_bloom_parameter bloom_parameter;
struct kdbus_bloom_filter bloom_filter;
struct kdbus_memfd memfd;
int fds[0];
struct kdbus_notify_name_change name_change;
struct kdbus_notify_id_change id_change;
struct kdbus_policy_access policy_access;
};
} __attribute__((__aligned__(8)));
/**
* enum kdbus_msg_flags - type of message
* @KDBUS_MSG_EXPECT_REPLY: Expect a reply message, used for
* method calls. The userspace-supplied
* cookie identifies the message and the
* respective reply carries the cookie
* in cookie_reply
* @KDBUS_MSG_NO_AUTO_START: Do not start a service if the addressed
* name is not currently active. This flag is
* not looked at by the kernel but only
* serves as hint for userspace implementations.
* @KDBUS_MSG_SIGNAL: Treat this message as signal
*/
enum kdbus_msg_flags {
KDBUS_MSG_EXPECT_REPLY = 1ULL << 0,
KDBUS_MSG_NO_AUTO_START = 1ULL << 1,
KDBUS_MSG_SIGNAL = 1ULL << 2,
};
/**
* enum kdbus_payload_type - type of payload carried by message
* @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message
* @KDBUS_PAYLOAD_DBUS: D-Bus marshalling "DBusDBus"
*
* Any payload-type is accepted. Common types will get added here once
* established.
*/
enum kdbus_payload_type {
KDBUS_PAYLOAD_KERNEL,
KDBUS_PAYLOAD_DBUS = 0x4442757344427573ULL,
};
/**
* struct kdbus_msg - the representation of a kdbus message
* @size: Total size of the message
* @flags: Message flags (KDBUS_MSG_*), userspace → kernel
* @priority: Message queue priority value
* @dst_id: 64-bit ID of the destination connection
* @src_id: 64-bit ID of the source connection
* @payload_type: Payload type (KDBUS_PAYLOAD_*)
* @cookie: Userspace-supplied cookie, for the connection
* to identify its messages
* @timeout_ns: The time to wait for a message reply from the peer.
* If there is no reply, and the send command is
* executed asynchronously, a kernel-generated message
* with an attached KDBUS_ITEM_REPLY_TIMEOUT item
* is sent to @src_id. For synchronously executed send
* command, the value denotes the maximum time the call
* blocks to wait for a reply. The timeout is expected in
* nanoseconds and as absolute CLOCK_MONOTONIC value.
* @cookie_reply: A reply to the requesting message with the same
* cookie. The requesting connection can match its
* request and the reply with this value
* @items: A list of kdbus_items containing the message payload
*/
struct kdbus_msg {
__u64 size;
__u64 flags;
__s64 priority;
__u64 dst_id;
__u64 src_id;
__u64 payload_type;
__u64 cookie;
union {
__u64 timeout_ns;
__u64 cookie_reply;
};
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_msg_info - returned message container
* @offset: Offset of kdbus_msg slice in pool
* @msg_size: Copy of the kdbus_msg.size field
* @return_flags: Command return flags, kernel → userspace
*/
struct kdbus_msg_info {
__u64 offset;
__u64 msg_size;
__u64 return_flags;
} __attribute__((__aligned__(8)));
/**
* enum kdbus_send_flags - flags for sending messages
* @KDBUS_SEND_SYNC_REPLY: Wait for destination connection to
* reply to this message. The
* KDBUS_CMD_SEND ioctl() will block
* until the reply is received, and
* offset_reply in struct kdbus_msg will
* yield the offset in the sender's pool
* where the reply can be found.
* This flag is only valid if
* @KDBUS_MSG_EXPECT_REPLY is set as well.
*/
enum kdbus_send_flags {
KDBUS_SEND_SYNC_REPLY = 1ULL << 0,
};
/**
* struct kdbus_cmd_send - send message
* @size: Overall size of this structure
* @flags: Flags to change send behavior (KDBUS_SEND_*)
* @return_flags: Command return flags, kernel → userspace
* @msg_address: Storage address of the kdbus_msg to send
* @reply: Storage for message reply if KDBUS_SEND_SYNC_REPLY
* was given
* @items: Additional items for this command
*/
struct kdbus_cmd_send {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 msg_address;
struct kdbus_msg_info reply;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_recv_flags - flags for de-queuing messages
* @KDBUS_RECV_PEEK: Return the next queued message without
* actually de-queuing it, and without installing
* any file descriptors or other resources. It is
* usually used to determine the activating
* connection of a bus name.
* @KDBUS_RECV_DROP: Drop and free the next queued message and all
* its resources without actually receiving it.
* @KDBUS_RECV_USE_PRIORITY: Only de-queue messages with the specified or
* higher priority (lowest values); if not set,
* the priority value is ignored.
*/
enum kdbus_recv_flags {
KDBUS_RECV_PEEK = 1ULL << 0,
KDBUS_RECV_DROP = 1ULL << 1,
KDBUS_RECV_USE_PRIORITY = 1ULL << 2,
};
/**
* enum kdbus_recv_return_flags - return flags for message receive commands
* @KDBUS_RECV_RETURN_INCOMPLETE_FDS: One or more file descriptors could not
* be installed. These descriptors in
* KDBUS_ITEM_FDS will carry the value -1.
* @KDBUS_RECV_RETURN_DROPPED_MSGS: There have been dropped messages since
* the last time a message was received.
* The 'dropped_msgs' counter contains the
* number of messages dropped pool
* overflows or other missed broadcasts.
*/
enum kdbus_recv_return_flags {
KDBUS_RECV_RETURN_INCOMPLETE_FDS = 1ULL << 0,
KDBUS_RECV_RETURN_DROPPED_MSGS = 1ULL << 1,
};
/**
* struct kdbus_cmd_recv - struct to de-queue a buffered message
* @size: Overall size of this object
* @flags: KDBUS_RECV_* flags, userspace → kernel
* @return_flags: Command return flags, kernel → userspace
* @priority: Minimum priority of the messages to de-queue. Lowest
* values have the highest priority.
* @dropped_msgs: In case there were any dropped messages since the last
* time a message was received, this will be set to the
* number of lost messages and
* KDBUS_RECV_RETURN_DROPPED_MSGS will be set in
* 'return_flags'. This can only happen if the ioctl
* returns 0 or EAGAIN.
* @msg: Return storage for received message.
* @items: Additional items for this command.
*
* This struct is used with the KDBUS_CMD_RECV ioctl.
*/
struct kdbus_cmd_recv {
__u64 size;
__u64 flags;
__u64 return_flags;
__s64 priority;
__u64 dropped_msgs;
struct kdbus_msg_info msg;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_cmd_free - struct to free a slice of memory in the pool
* @size: Overall size of this structure
* @flags: Flags for the free command, userspace → kernel
* @return_flags: Command return flags, kernel → userspace
* @offset: The offset of the memory slice, as returned by other
* ioctls
* @items: Additional items to modify the behavior
*
* This struct is used with the KDBUS_CMD_FREE ioctl.
*/
struct kdbus_cmd_free {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 offset;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_hello_flags - flags for struct kdbus_cmd_hello
* @KDBUS_HELLO_ACCEPT_FD: The connection allows the reception of
* any passed file descriptors
* @KDBUS_HELLO_ACTIVATOR: Special-purpose connection which registers
* a well-know name for a process to be started
* when traffic arrives
* @KDBUS_HELLO_POLICY_HOLDER: Special-purpose connection which registers
* policy entries for a name. The provided name
* is not activated and not registered with the
* name database, it only allows unprivileged
* connections to acquire a name, talk or discover
* a service
* @KDBUS_HELLO_MONITOR: Special-purpose connection to monitor
* bus traffic
*/
enum kdbus_hello_flags {
KDBUS_HELLO_ACCEPT_FD = 1ULL << 0,
KDBUS_HELLO_ACTIVATOR = 1ULL << 1,
KDBUS_HELLO_POLICY_HOLDER = 1ULL << 2,
KDBUS_HELLO_MONITOR = 1ULL << 3,
};
/**
* struct kdbus_cmd_hello - struct to say hello to kdbus
* @size: The total size of the structure
* @flags: Connection flags (KDBUS_HELLO_*), userspace → kernel
* @return_flags: Command return flags, kernel → userspace
* @attach_flags_send: Mask of metadata to attach to each message sent
* off by this connection (KDBUS_ATTACH_*)
* @attach_flags_recv: Mask of metadata to attach to each message receieved
* by the new connection (KDBUS_ATTACH_*)
* @bus_flags: The flags field copied verbatim from the original
* KDBUS_CMD_BUS_MAKE ioctl. It's intended to be useful
* to do negotiation of features of the payload that is
* transferred (kernel → userspace)
* @id: The ID of this connection (kernel → userspace)
* @pool_size: Size of the connection's buffer where the received
* messages are placed
* @offset: Pool offset where items are returned to report
* additional information about the bus and the newly
* created connection.
* @items_size: Size of buffer returned in the pool slice at @offset.
* @id128: Unique 128-bit ID of the bus (kernel → userspace)
* @items: A list of items
*
* This struct is used with the KDBUS_CMD_HELLO ioctl.
*/
struct kdbus_cmd_hello {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 attach_flags_send;
__u64 attach_flags_recv;
__u64 bus_flags;
__u64 id;
__u64 pool_size;
__u64 offset;
__u64 items_size;
__u8 id128[16];
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_info - connection information
* @size: total size of the struct
* @id: 64bit object ID
* @flags: object creation flags
* @items: list of items
*
* Note that the user is responsible for freeing the allocated memory with
* the KDBUS_CMD_FREE ioctl.
*/
struct kdbus_info {
__u64 size;
__u64 id;
__u64 flags;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_list_flags - what to include into the returned list
* @KDBUS_LIST_UNIQUE: active connections
* @KDBUS_LIST_ACTIVATORS: activator connections
* @KDBUS_LIST_NAMES: known well-known names
* @KDBUS_LIST_QUEUED: queued-up names
*/
enum kdbus_list_flags {
KDBUS_LIST_UNIQUE = 1ULL << 0,
KDBUS_LIST_NAMES = 1ULL << 1,
KDBUS_LIST_ACTIVATORS = 1ULL << 2,
KDBUS_LIST_QUEUED = 1ULL << 3,
};
/**
* struct kdbus_cmd_list - list connections
* @size: overall size of this object
* @flags: flags for the query (KDBUS_LIST_*), userspace → kernel
* @return_flags: command return flags, kernel → userspace
* @offset: Offset in the caller's pool buffer where an array of
* kdbus_info objects is stored.
* The user must use KDBUS_CMD_FREE to free the
* allocated memory.
* @list_size: size of returned list in bytes
* @items: Items for the command. Reserved for future use.
*
* This structure is used with the KDBUS_CMD_LIST ioctl.
*/
struct kdbus_cmd_list {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 offset;
__u64 list_size;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* struct kdbus_cmd_info - struct used for KDBUS_CMD_CONN_INFO ioctl
* @size: The total size of the struct
* @flags: Flags for this ioctl, userspace → kernel
* @return_flags: Command return flags, kernel → userspace
* @id: The 64-bit ID of the connection. If set to zero, passing
* @name is required. kdbus will look up the name to
* determine the ID in this case.
* @attach_flags: Set of attach flags to specify the set of information
* to receive, userspace → kernel
* @offset: Returned offset in the caller's pool buffer where the
* kdbus_info struct result is stored. The user must
* use KDBUS_CMD_FREE to free the allocated memory.
* @info_size: Output buffer to report size of data at @offset.
* @items: The optional item list, containing the
* well-known name to look up as a KDBUS_ITEM_NAME.
* Only needed in case @id is zero.
*
* On success, the KDBUS_CMD_CONN_INFO ioctl will return 0 and @offset will
* tell the user the offset in the connection pool buffer at which to find the
* result in a struct kdbus_info.
*/
struct kdbus_cmd_info {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 id;
__u64 attach_flags;
__u64 offset;
__u64 info_size;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_cmd_match_flags - flags to control the KDBUS_CMD_MATCH_ADD ioctl
* @KDBUS_MATCH_REPLACE: If entries with the supplied cookie already
* exists, remove them before installing the new
* matches.
*/
enum kdbus_cmd_match_flags {
KDBUS_MATCH_REPLACE = 1ULL << 0,
};
/**
* struct kdbus_cmd_match - struct to add or remove matches
* @size: The total size of the struct
* @flags: Flags for match command (KDBUS_MATCH_*),
* userspace → kernel
* @return_flags: Command return flags, kernel → userspace
* @cookie: Userspace supplied cookie. When removing, the cookie
* identifies the match to remove
* @items: A list of items for additional information
*
* This structure is used with the KDBUS_CMD_MATCH_ADD and
* KDBUS_CMD_MATCH_REMOVE ioctl.
*/
struct kdbus_cmd_match {
__u64 size;
__u64 flags;
__u64 return_flags;
__u64 cookie;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* enum kdbus_make_flags - Flags for KDBUS_CMD_{BUS,ENDPOINT}_MAKE
* @KDBUS_MAKE_ACCESS_GROUP: Make the bus or endpoint node group-accessible
* @KDBUS_MAKE_ACCESS_WORLD: Make the bus or endpoint node world-accessible
*/
enum kdbus_make_flags {
KDBUS_MAKE_ACCESS_GROUP = 1ULL << 0,
KDBUS_MAKE_ACCESS_WORLD = 1ULL << 1,
};
/**
* enum kdbus_name_flags - flags for KDBUS_CMD_NAME_ACQUIRE
* @KDBUS_NAME_REPLACE_EXISTING: Try to replace name of other connections
* @KDBUS_NAME_ALLOW_REPLACEMENT: Allow the replacement of the name
* @KDBUS_NAME_QUEUE: Name should be queued if busy
* @KDBUS_NAME_IN_QUEUE: Name is queued
* @KDBUS_NAME_ACTIVATOR: Name is owned by a activator connection
*/
enum kdbus_name_flags {
KDBUS_NAME_REPLACE_EXISTING = 1ULL << 0,
KDBUS_NAME_ALLOW_REPLACEMENT = 1ULL << 1,
KDBUS_NAME_QUEUE = 1ULL << 2,
KDBUS_NAME_IN_QUEUE = 1ULL << 3,
KDBUS_NAME_ACTIVATOR = 1ULL << 4,
};
/**
* struct kdbus_cmd - generic ioctl payload
* @size: Overall size of this structure
* @flags: Flags for this ioctl, userspace → kernel
* @return_flags: Ioctl return flags, kernel → userspace
* @items: Additional items to modify the behavior
*
* This is a generic ioctl payload object. It's used by all ioctls that only
* take flags and items as input.
*/
struct kdbus_cmd {
__u64 size;
__u64 flags;
__u64 return_flags;
struct kdbus_item items[0];
} __attribute__((__aligned__(8)));
/**
* Ioctl API
*
* KDBUS_CMD_BUS_MAKE: After opening the "control" node, this command
* creates a new bus with the specified
* name. The bus is immediately shut down and
* cleaned up when the opened file descriptor is
* closed.
*
* KDBUS_CMD_ENDPOINT_MAKE: Creates a new named special endpoint to talk to
* the bus. Such endpoints usually carry a more
* restrictive policy and grant restricted access
* to specific applications.
* KDBUS_CMD_ENDPOINT_UPDATE: Update the properties of a custom enpoint. Used
* to update the policy.
*
* KDBUS_CMD_HELLO: By opening the bus node, a connection is
* created. After a HELLO the opened connection
* becomes an active peer on the bus.
* KDBUS_CMD_UPDATE: Update the properties of a connection. Used to
* update the metadata subscription mask and
* policy.
* KDBUS_CMD_BYEBYE: Disconnect a connection. If there are no
* messages queued up in the connection's pool,
* the call succeeds, and the handle is rendered
* unusable. Otherwise, -EBUSY is returned without
* any further side-effects.
* KDBUS_CMD_FREE: Release the allocated memory in the receiver's
* pool.
* KDBUS_CMD_CONN_INFO: Retrieve credentials and properties of the
* initial creator of the connection. The data was
* stored at registration time and does not
* necessarily represent the connected process or
* the actual state of the process.
* KDBUS_CMD_BUS_CREATOR_INFO: Retrieve information of the creator of the bus
* a connection is attached to.
*
* KDBUS_CMD_SEND: Send a message and pass data from userspace to
* the kernel.
* KDBUS_CMD_RECV: Receive a message from the kernel which is
* placed in the receiver's pool.
*
* KDBUS_CMD_NAME_ACQUIRE: Request a well-known bus name to associate with
* the connection. Well-known names are used to
* address a peer on the bus.
* KDBUS_CMD_NAME_RELEASE: Release a well-known name the connection
* currently owns.
* KDBUS_CMD_LIST: Retrieve the list of all currently registered
* well-known and unique names.
*
* KDBUS_CMD_MATCH_ADD: Install a match which broadcast messages should
* be delivered to the connection.
* KDBUS_CMD_MATCH_REMOVE: Remove a current match for broadcast messages.
*/
enum kdbus_ioctl_type {
/* bus owner (00-0f) */
KDBUS_CMD_BUS_MAKE = _IOW(KDBUS_IOCTL_MAGIC, 0x00,
struct kdbus_cmd),
/* endpoint owner (10-1f) */
KDBUS_CMD_ENDPOINT_MAKE = _IOW(KDBUS_IOCTL_MAGIC, 0x10,
struct kdbus_cmd),
KDBUS_CMD_ENDPOINT_UPDATE = _IOW(KDBUS_IOCTL_MAGIC, 0x11,
struct kdbus_cmd),
/* connection owner (80-ff) */
KDBUS_CMD_HELLO = _IOWR(KDBUS_IOCTL_MAGIC, 0x80,
struct kdbus_cmd_hello),
KDBUS_CMD_UPDATE = _IOW(KDBUS_IOCTL_MAGIC, 0x81,
struct kdbus_cmd),
KDBUS_CMD_BYEBYE = _IOW(KDBUS_IOCTL_MAGIC, 0x82,
struct kdbus_cmd),
KDBUS_CMD_FREE = _IOW(KDBUS_IOCTL_MAGIC, 0x83,
struct kdbus_cmd_free),
KDBUS_CMD_CONN_INFO = _IOR(KDBUS_IOCTL_MAGIC, 0x84,
struct kdbus_cmd_info),
KDBUS_CMD_BUS_CREATOR_INFO = _IOR(KDBUS_IOCTL_MAGIC, 0x85,
struct kdbus_cmd_info),
KDBUS_CMD_LIST = _IOR(KDBUS_IOCTL_MAGIC, 0x86,
struct kdbus_cmd_list),
KDBUS_CMD_SEND = _IOW(KDBUS_IOCTL_MAGIC, 0x90,
struct kdbus_cmd_send),
KDBUS_CMD_RECV = _IOR(KDBUS_IOCTL_MAGIC, 0x91,
struct kdbus_cmd_recv),
KDBUS_CMD_NAME_ACQUIRE = _IOW(KDBUS_IOCTL_MAGIC, 0xa0,
struct kdbus_cmd),
KDBUS_CMD_NAME_RELEASE = _IOW(KDBUS_IOCTL_MAGIC, 0xa1,
struct kdbus_cmd),
KDBUS_CMD_MATCH_ADD = _IOW(KDBUS_IOCTL_MAGIC, 0xb0,
struct kdbus_cmd_match),
KDBUS_CMD_MATCH_REMOVE = _IOW(KDBUS_IOCTL_MAGIC, 0xb1,
struct kdbus_cmd_match),
};
#endif /* _KDBUS_UAPI_H_ */
Something went wrong with that request. Please try again.