/* * Copyright (C) 2013 Kay Sievers * Copyright (C) 2013 Greg Kroah-Hartman * Copyright (C) 2013 Linux Foundation * Copyright (C) 2013 Lennart Poettering * Copyright (C) 2013 Daniel Mack * * 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_H_ #define _KDBUS_H_ #ifndef __KERNEL__ #include #include #include #endif #define KDBUS_IOC_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) /** * 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; }; /** * struct kdbus_notify_name_change - name registry change message * @old: ID and flags of former owner of a name * @new: 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; struct kdbus_notify_id_change new; char name[0]; }; /** * struct kdbus_creds - process credentials * @uid: User ID * @gid: Group ID * @pid: Process ID * @tid: Thread ID * @starttime: Starttime of the process * * The starttime of the process PID. This is useful to detect PID overruns * from the client side. i.e. if you use the PID to look something up in * /proc/$PID/ you can afterwards check the starttime field of it, to ensure * you didn't run into a PID overrun. * * Attached to: * KDBUS_ITEM_CREDS */ struct kdbus_creds { __u64 uid; __u64 gid; __u64 pid; __u64 tid; __u64 starttime; }; /** * struct kdbus_audit - audit information * @sessionid: The audit session ID * @loginuid: The audit login uid * * Attached to: * KDBUS_ITEM_AUDIT */ struct kdbus_audit { __u64 sessionid; __u64 loginuid; }; /** * struct kdbus_timestamp * @monotonic_ns: Monotonic timestamp, in nanoseconds * @realtime_ns: Realtime timestamp, in nanoseconds * * Attached to: * KDBUS_ITEM_TIMESTAMP */ struct kdbus_timestamp { __u64 monotonic_ns; __u64 realtime_ns; }; /** * struct kdbus_vec - I/O vector for kdbus payload items * @size: The size of the vector * @address: Memory address for memory addresses * @offset: Offset in the in-message payload memory, * relative to the message head * * Attached to: * KDBUS_ITEM_PAYLOAD_VEC */ struct kdbus_vec { __u64 size; union { __u64 address; __u64 offset; }; }; /** * struct kdbus_memfd - a kdbus memfd * @size: The memfd's size * @fd: The file descriptor number * @__pad: Padding to make the struct aligned * * Attached to: * KDBUS_ITEM_PAYLOAD_MEMFD */ struct kdbus_memfd { __u64 size; int fd; __u32 __pad; }; /** * struct kdbus_name - a registered well-known name with its flags * @flags: flags from KDBUS_NAME_* * @name: well-known name * * Attached to: * KDBUS_ITEM_NAME */ struct kdbus_name { __u64 flags; char name[0]; }; /** * struct kdbus_policy_access - policy access item * @type: One of KDBUS_POLICY_ACCESS_* types * @bits: Access to grant. One of KDBUS_POLICY_* * @id: For KDBUS_POLICY_ACCESS_USER, the uid * For KDBUS_POLICY_ACCESS_GROUP, the gid * * Embedded in: * struct kdbus_policy */ struct kdbus_policy_access { __u64 type; /* USER, GROUP, WORLD */ __u64 bits; /* RECV, SEND, OWN */ __u64 id; /* uid, gid, 0 */ }; /** * struct kdbus_policy - a policy item * @access: Policy access details * @name: Well-known name to grant access to * * Attached to: * KDBUS_POLICY_ACCESS * KDBUS_ITEM_POLICY_NAME */ struct kdbus_policy { union { struct kdbus_policy_access access; char name[0]; }; }; /** * enum kdbus_item_type - item types to chain data in a list * @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_BLOOM: For broadcasts, carries bloom filter * @KDBUS_ITEM_BLOOM_SIZE: Desired bloom size, used by KDBUS_CMD_BUS_MAKE * @KDBUS_ITEM_DST_NAME: Destination's well-known name * @KDBUS_ITEM_PRIORITY: Queue priority for message * @KDBUS_ITEM_MAKE_NAME: Name of namespace, bus, endpoint * @KDBUS_ITEM_POLICY_NAME: Policy in struct kdbus_policy * @KDBUS_ITEM_POLICY_ACCESS: Policy in struct kdbus_policy * @KDBUS_ITEM_NAME: Well-know name with flags * @KDBUS_ITEM_ID: Connection ID * @KDBUS_ITEM_TIMESTAMP: Timestamp * @KDBUS_ITEM_CREDS: Process credential * @KDBUS_ITEM_PID_COMM: Process ID "comm" identifier * @KDBUS_ITEM_TID_COMM: Thread ID "comm" identifier * @KDBUS_ITEM_EXE: The path of the executable * @KDBUS_ITEM_CMDLINE: The process command line * @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_NAME_ADD: Notify in struct kdbus_notify_name_change * @KDBUS_ITEM_NAME_REMOVE: Notify in struct kdbus_notify_name_change * @KDBUS_ITEM_NAME_CHANGE: Notify in struct kdbus_notify_name_change * @KDBUS_ITEM_ID_ADD: Notify in struct kdbus_notify_id_change * @KDBUS_ITEM_ID_REMOVE: Notify in struct kdbus_notify_id_change * @KDBUS_ITEM_REPLY_TIMEOUT: Timeout has been reached * @KDBUS_ITEM_REPLY_DEAD: Destination died */ enum kdbus_item_type { _KDBUS_ITEM_NULL, _KDBUS_ITEM_USER_BASE, KDBUS_ITEM_PAYLOAD_VEC = _KDBUS_ITEM_USER_BASE, KDBUS_ITEM_PAYLOAD_OFF, KDBUS_ITEM_PAYLOAD_MEMFD, KDBUS_ITEM_FDS, KDBUS_ITEM_BLOOM, KDBUS_ITEM_BLOOM_SIZE, KDBUS_ITEM_DST_NAME, KDBUS_ITEM_PRIORITY, KDBUS_ITEM_MAKE_NAME, _KDBUS_ITEM_POLICY_BASE = 0x400, KDBUS_ITEM_POLICY_NAME = _KDBUS_ITEM_POLICY_BASE, KDBUS_ITEM_POLICY_ACCESS, _KDBUS_ITEM_ATTACH_BASE = 0x600, KDBUS_ITEM_NAME = _KDBUS_ITEM_ATTACH_BASE, KDBUS_ITEM_ID, KDBUS_ITEM_TIMESTAMP, KDBUS_ITEM_CREDS, KDBUS_ITEM_PID_COMM, KDBUS_ITEM_TID_COMM, KDBUS_ITEM_EXE, KDBUS_ITEM_CMDLINE, KDBUS_ITEM_CGROUP, KDBUS_ITEM_CAPS, KDBUS_ITEM_SECLABEL, KDBUS_ITEM_AUDIT, _KDBUS_ITEM_KERNEL_BASE = 0x800, 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 * @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_NAME * 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_audit audit; struct kdbus_timestamp timestamp; struct kdbus_name name; struct kdbus_memfd memfd; int fds[0]; struct kdbus_notify_name_change name_change; struct kdbus_notify_id_change id_change; struct kdbus_policy policy; }; }; /** * enum kdbus_msg_flags - type of message * @KDBUS_MSG_FLAGS_EXPECT_REPLY: Expect a reply message, used for method * calls. The cookie identifies the * message and the respective reply * @KDBUS_MSG_FLAGS_NO_AUTO_START: Do not start a service, if the addressed * name is not currently active */ enum kdbus_msg_flags { KDBUS_MSG_FLAGS_EXPECT_REPLY = 1 << 0, KDBUS_MSG_FLAGS_NO_AUTO_START = 1 << 1, }; /** * enum kdbus_payload_type - type of payload carried by message * @KDBUS_PAYLOAD_KERNEL: Kernel-generated simple message * @KDBUS_PAYLOAD_DBUS: D-Bus marshalling */ enum kdbus_payload_type { KDBUS_PAYLOAD_KERNEL, KDBUS_PAYLOAD_DBUS = 0x4442757344427573ULL, /* 'DBusDBus' */ }; /** * struct kdbus_msg - the representation of a kdbus message * @size: Total size of the message * @flags: Message flags (KDBUS_MSG_FLAGS_*) * @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 * @cookie_reply: For kernel-generated messages, this is the cookie * the message is a reply to * @timeout_ns: For non-kernel-generated messages, this denotes the * message timeout in nanoseconds. A message has to be * received with KDBUS_CMD_MSG_RECV by the destination * connection within this time frame. For messages that * have KDBUS_MSG_FLAGS_EXPECT_REPLY set in @flags, * this value also denotes the timeout for the reply to * this message. If there is no reply, or the message is * not received in time by the other side, a * kernel-generated message with an attached * KDBUS_ITEM_REPLY_TIMEOUT item is sent to @src_id. * A 0-value is only valid if KDBUS_MSG_FLAGS_EXPECT_REPLY * is unset in @flags. * @items: A list of kdbus_items containing the message payload */ struct kdbus_msg { __u64 size; __u64 flags; __u64 dst_id; __u64 src_id; __u64 payload_type; __u64 cookie; union { __u64 cookie_reply; __u64 timeout_ns; }; struct kdbus_item items[0]; } __attribute__((aligned(8))); /** * enum kdbus_policy_access_type - permissions of a policy record * @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_RECV: Allow receive * @KDBUS_POLICY_SEND: Allow send * @KDBUS_POLICY_OWN: Allow to own a well-known name */ enum kdbus_policy_type { KDBUS_POLICY_RECV = 1 << 2, KDBUS_POLICY_SEND = 1 << 1, KDBUS_POLICY_OWN = 1 << 0, }; /** * struct kdbus_cmd_policy - a series of policies to upload * @size: The total size of the structure * @policies: The policies to upload * * A KDBUS_POLICY_NAME must always preceeds a KDBUS_POLICY_ACCESS entry. * A new KDBUS_POLICY_NAME can be added after KDBUS_POLICY_ACCESS for * chaining multiple policies together. */ struct kdbus_cmd_policy { __u64 size; struct kdbus_item policies[0]; } __attribute__((aligned(8))); /** * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello * @KDBUS_HELLO_ACCEPT_FD: The connection allows the receiving 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_MONITOR: Special-purpose connection to monitor * bus traffic */ enum kdbus_hello_flags { KDBUS_HELLO_ACCEPT_FD = 1 << 0, KDBUS_HELLO_ACTIVATOR = 1 << 1, KDBUS_HELLO_MONITOR = 1 << 2, }; /** * enum kdbus_attach_flags - flags for metadata attachments * @KDBUS_ATTACH_TIMESTAMP: Timestamp * @KDBUS_ATTACH_CREDS: Credentials * @KDBUS_ATTACH_NAMES: Well-known names * @KDBUS_ATTACH_COMM: The "comm" process identifier * @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 */ enum kdbus_attach_flags { KDBUS_ATTACH_TIMESTAMP = 1 << 0, KDBUS_ATTACH_CREDS = 1 << 1, KDBUS_ATTACH_NAMES = 1 << 2, KDBUS_ATTACH_COMM = 1 << 3, KDBUS_ATTACH_EXE = 1 << 4, KDBUS_ATTACH_CMDLINE = 1 << 5, KDBUS_ATTACH_CGROUP = 1 << 6, KDBUS_ATTACH_CAPS = 1 << 7, KDBUS_ATTACH_SECLABEL = 1 << 8, KDBUS_ATTACH_AUDIT = 1 << 9, }; /** * struct kdbus_cmd_hello - struct to say hello to kdbus * @size: The total size of the structure * @conn_flags: Connection flags (KDBUS_HELLO_*). The kernel will * return its capabilities in that field. * @attach_flags: Mask of metadata to attach to each message sent * (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) * @bloom_size: The bloom filter size chosen by the owner * (kernel → userspace) * @pool_size: Maximum size of the pool buffer (kernel → userspace) * @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. See the ioctl * documentation for more information. */ struct kdbus_cmd_hello { __u64 size; __u64 conn_flags; __u64 attach_flags; __u64 bus_flags; __u64 id; __u64 bloom_size; __u64 pool_size; __u8 id128[16]; struct kdbus_item items[0]; } __attribute__((aligned(8))); /* Flags for KDBUS_CMD_{BUS,EP,NS}_MAKE */ enum kdbus_make_flags { KDBUS_MAKE_ACCESS_GROUP = 1 << 0, KDBUS_MAKE_ACCESS_WORLD = 1 << 1, KDBUS_MAKE_POLICY_OPEN = 1 << 2, }; /** * struct kdbus_cmd_make - struct to make a bus, an endpoint or a namespace * @size: The total size of the struct * @flags: Properties for the bus/ep/ns to create * @items: Items describing details * * This structure is used with the KDBUS_CMD_BUS_MAKE, KDBUS_CMD_EP_MAKE and * KDBUS_CMD_NS_MAKE ioctls. */ struct kdbus_cmd_make { __u64 size; __u64 flags; struct kdbus_item items[0]; } __attribute__((aligned(8))); /** * enum kdbus_name_flags - properties of a well-known name * @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 = 1 << 0, KDBUS_NAME_ALLOW_REPLACEMENT = 1 << 1, KDBUS_NAME_QUEUE = 1 << 2, KDBUS_NAME_IN_QUEUE = 1 << 3, KDBUS_NAME_ACTIVATOR = 1 << 4, }; /** * struct kdbus_cmd_name - struct to describe a well-known name * @size: The total size of the struct * @flags: Flags for a name entry (KDBUS_NAME_*) * @owner_id: Privileged users may use this field to (de)register * names on behalf of other peers. * @conn_flags: The flags of the owning connection (KDBUS_HELLO_*) * @name: The well-known name * * This structure is used with the KDBUS_CMD_NAME_ACQUIRE ioctl. */ struct kdbus_cmd_name { __u64 size; __u64 flags; __u64 owner_id; __u64 conn_flags; char name[0]; } __attribute__((aligned(8))); /** * enum kdbus_name_list_flags - what to include into the returned list * @KDBUS_NAME_LIST_UNIQUE: All active connections * @KDBUS_NAME_LIST_NAMES: All known well-known names * @KDBUS_NAME_LIST_ACTIVATORS: All activator connections * @KDBUS_NAME_LIST_QUEUED: All queued-up names */ enum kdbus_name_list_flags { KDBUS_NAME_LIST_UNIQUE = 1 << 0, KDBUS_NAME_LIST_NAMES = 1 << 1, KDBUS_NAME_LIST_ACTIVATORS = 1 << 2, KDBUS_NAME_LIST_QUEUED = 1 << 3, }; /** * struct kdbus_cmd_name_list - request a list of name entries * @flags: Flags for the query (KDBUS_NAME_LIST_*) * @offset: The returned offset in the caller's pool buffer. * The user must use KDBUS_CMD_FREE to free the * allocated memory. * * This structure is used with the KDBUS_CMD_NAME_LIST ioctl. */ struct kdbus_cmd_name_list { __u64 flags; __u64 offset; } __attribute__((aligned(8))); /** * struct kdbus_name_list - information returned by KDBUS_CMD_NAME_LIST * @size: The total size of the structure * @names: A list of names * * Note that the user is responsible for freeing the allocated memory with * the KDBUS_CMD_FREE ioctl. */ struct kdbus_name_list { __u64 size; struct kdbus_cmd_name names[0]; }; /** * struct kdbus_cmd_conn_info - struct used for KDBUS_CMD_CONN_INFO ioctl * @size: The total size of the struct * @flags: KDBUS_ATTACH_* flags * @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. * @offset: Returned offset in the caller's pool buffer where the * kdbus_conn_info struct result is stored. The user must * use KDBUS_CMD_FREE to free the allocated memory. * @name: The optional well-known name to look up. 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_conn_info. */ struct kdbus_cmd_conn_info { __u64 size; __u64 flags; __u64 id; __u64 offset; char name[0]; } __attribute__((aligned(8))); /** * struct kdbus_conn_info - information returned by KDBUS_CMD_CONN_INFO * @size: The total size of the struct * @id: The connection's 64-bit ID * @flags: The connection's flags * @items: A list of struct kdbus_item * * Note that the user is responsible for freeing the allocated memory with * the KDBUS_CMD_FREE ioctl. */ struct kdbus_conn_info { __u64 size; __u64 id; __u64 flags; struct kdbus_item items[0]; }; /** * struct kdbus_cmd_match - struct to add or remove matches * @size: The total size of the struct * @owner_id: Privileged users may (de)register matches on behalf * of other peers. In other cases, set to 0. * @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_ADD_MATCH and * KDBUS_CMD_REMOVE_MATCH ioctl. */ struct kdbus_cmd_match { __u64 size; __u64 owner_id; __u64 cookie; struct kdbus_item items[0]; } __attribute__((aligned(8))); /** * enum kdbus_ioctl_type - Ioctl API * @KDBUS_CMD_BUS_MAKE: After opening the "control" device node, this * command creates a new bus with the specified * name. The bus is immediately shut down and * cleaned up when the opened "control" device node * is closed. * @KDBUS_CMD_NS_MAKE: Similar to KDBUS_CMD_BUS_MAKE, but it creates a * new kdbus namespace. * @KDBUS_CMD_EP_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_HELLO: By opening the bus device node a connection is * created. After a HELLO the opened connection * becomes an active peer on the bus. * @KDBUS_CMD_BYEBYE: Disconnect a connection. If the connection's * message list is empty, the calls succeeds, and * the handle is rendered unusable. Otherwise, * -EAGAIN is returned without any further side- * effects. * @KDBUS_CMD_MSG_SEND: Send a message and pass data from userspace to * the kernel. * @KDBUS_CMD_MSG_RECV: Receive a message from the kernel which is * placed in the receiver's pool. * @KDBUS_CMD_FREE: Release the allocated memory in the receiver's * pool. * @KDBUS_CMD_DROP: Drop and free the next queued message and all * its ressources without actually receiveing it. * @KDBUS_CMD_SRC: Return the sender's connection ID of the next * queued message. * @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_NAME_LIST: Retrieve the list of all currently registered * well-known and unique names. * @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_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. * @KDBUS_CMD_EP_POLICY_SET: Set the policy of an endpoint. It is used to * restrict the access for endpoints created with * KDBUS_CMD_EP_MAKE. * @KDBUS_CMD_MEMFD_NEW: Return a new file descriptor which provides an * anonymous shared memory file and which can be * used to pass around larger chunks of data. * Kdbus memfd files can be sealed, which allows * the receiver to trust the data it has received. * Kdbus memfd files expose only very limited * operations, they can be mmap()ed, seek()ed, * (p)read(v)() and (p)write(v)(); most other * common file operations are not implemented. * Special caution needs to be taken with * read(v)()/write(v)() on a shared file; the * underlying file position is always shared * between all users of the file and race against * each other, pread(v)()/pwrite(v)() avoid these * issues. * @KDBUS_CMD_MEMFD_SIZE_GET: Return the size of the underlying file, which * changes with write(). * @KDBUS_CMD_MEMFD_SIZE_SET: Truncate the underlying file to the specified * size. * @KDBUS_CMD_MEMFD_SEAL_GET: Return the state of the file sealing. * @KDBUS_CMD_MEMFD_SEAL_SET: Seal or break a seal of the file. Only files * which are not shared with other processes and * which are currently not mapped can be sealed. * The current process needs to be the one and * single owner of the file, the sealing cannot * be changed as long as the file is shared. */ enum kdbus_ioctl_type { KDBUS_CMD_BUS_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x00, struct kdbus_cmd_make), KDBUS_CMD_NS_MAKE = _IOR (KDBUS_IOC_MAGIC, 0x10, struct kdbus_cmd_make), KDBUS_CMD_EP_MAKE = _IOW (KDBUS_IOC_MAGIC, 0x20, struct kdbus_cmd_make), KDBUS_CMD_HELLO = _IOWR(KDBUS_IOC_MAGIC, 0x30, struct kdbus_cmd_hello), KDBUS_CMD_BYEBYE = _IO (KDBUS_IOC_MAGIC, 0x31), KDBUS_CMD_MSG_SEND = _IOW (KDBUS_IOC_MAGIC, 0x40, struct kdbus_msg), KDBUS_CMD_MSG_RECV = _IOR (KDBUS_IOC_MAGIC, 0x41, __u64 *), KDBUS_CMD_FREE = _IOW (KDBUS_IOC_MAGIC, 0x42, __u64 *), KDBUS_CMD_MSG_DROP = _IO (KDBUS_IOC_MAGIC, 0x43), KDBUS_CMD_MSG_SRC = _IOR (KDBUS_IOC_MAGIC, 0x44, __u64 *), KDBUS_CMD_NAME_ACQUIRE = _IOWR(KDBUS_IOC_MAGIC, 0x50, struct kdbus_cmd_name), KDBUS_CMD_NAME_RELEASE = _IOW (KDBUS_IOC_MAGIC, 0x51, struct kdbus_cmd_name), KDBUS_CMD_NAME_LIST = _IOWR(KDBUS_IOC_MAGIC, 0x52, struct kdbus_cmd_name_list), KDBUS_CMD_CONN_INFO = _IOWR(KDBUS_IOC_MAGIC, 0x60, struct kdbus_cmd_conn_info), KDBUS_CMD_MATCH_ADD = _IOW (KDBUS_IOC_MAGIC, 0x70, struct kdbus_cmd_match), KDBUS_CMD_MATCH_REMOVE = _IOW (KDBUS_IOC_MAGIC, 0x71, struct kdbus_cmd_match), KDBUS_CMD_EP_POLICY_SET = _IOW (KDBUS_IOC_MAGIC, 0x80, struct kdbus_cmd_policy), KDBUS_CMD_MEMFD_NEW = _IOR (KDBUS_IOC_MAGIC, 0x90, int *), KDBUS_CMD_MEMFD_SIZE_GET = _IOR (KDBUS_IOC_MAGIC, 0x91, __u64 *), KDBUS_CMD_MEMFD_SIZE_SET = _IOW (KDBUS_IOC_MAGIC, 0x92, __u64 *), KDBUS_CMD_MEMFD_SEAL_GET = _IOR (KDBUS_IOC_MAGIC, 0x93, int *), KDBUS_CMD_MEMFD_SEAL_SET = _IO (KDBUS_IOC_MAGIC, 0x94), }; /* * errno - api error codes * @E2BIG: A message contains too many records or items. * @EADDRINUSE: A well-known bus name is already taken by another * connection. * @EADDRNOTAVAIL: A message flagged not to activate a service, addressed * a service which is not currently running. * @EAGAIN: No messages are queued at the moment. * @EBADF: File descriptors passed with the message are not valid. * @EBADFD: A bus connection is in a corrupted state. * @EBADMSG: Passed data contains a combination of conflicting or * inconsistent types. * @EBUSY: The user tried to say BYEBYE to a connection, but the * connection had a non-empty message list. * @ECONNRESET: A connection is shut down, no further operations are * possible. * @ECOMM: A peer does not accept the file descriptors addressed * to it. * @EDESTADDRREQ: The well-known bus name is required but missing. * @EDOM: The size of data does not match the expectations. Used * for the size of the bloom filter bit field. * @EEXIST: A requested namespace, bus or endpoint with the same * name already exists. A specific data type, which is * only expected once, is provided multiple times. * @EFAULT: The supplied memory could not be accessed, or the data * is not properly aligned. * @EINVAL: The provided data does not match its type or other * expectations, like a string which is not NUL terminated, * or a string length that points behind the first * \0-byte in the string. * @EMEDIUMTYPE: A file descriptor which is not a kdbus memfd was * refused to send as KDBUS_MSG_PAYLOAD_MEMFD. * @EMFILE: Too many file descriptors have been supplied with a * message. * @EMSGSIZE: The supplied data is larger than the allowed maximum * size. * @ENAMETOOLONG: The requested name is larger than the allowed maximum * size. * @ENOBUFS: There is no space left for the submitted data to fit * into the receiver's pool. * @ENOENT: The name to query information about is currently not on * the bus. * @ENOMEM: Out of memory. * @ENOSYS: The requested functionality is not available. * @ENOTCONN: The addressed peer is not an active connection. * @ENOTSUPP: The feature negotiation failed, a not supported feature * was requested, or an unknown item type was received. * @ENOTTY: An unknown ioctl command was received. * @ENOTUNIQ: A specific data type was addressed to a broadcast * address, but only direct addresses support this kind of * data. * @ENXIO: A unique address does not exist, or an offset in the * receiver's pool does not represent a queued message. * @EPERM: The policy prevented an operation. The requested * resource is owned by another entity. * @ESHUTDOWN: A namespace or endpoint is currently shutting down; * no further operations will be possible. * @ESRCH: A requested well-known bus name is not found. * @ETXTBSY: A kdbus memfd file cannot be sealed or the seal removed, * because it is shared with other processes or still * mmap()ed. * @EXFULL: The size limits in the pool are reached, no data of * the size tried to submit can be queued. */ #endif