1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_LINUX_FANOTIFY_H
3 #define _UAPI_LINUX_FANOTIFY_H
5 #include <linux/types.h>
7 /* the following events that user-space can register for */
8 #define FAN_ACCESS 0x00000001 /* File was accessed */
9 #define FAN_MODIFY 0x00000002 /* File was modified */
10 #define FAN_ATTRIB 0x00000004 /* Metadata changed */
11 #define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
12 #define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
13 #define FAN_OPEN 0x00000020 /* File was opened */
14 #define FAN_MOVED_FROM 0x00000040 /* File was moved from X */
15 #define FAN_MOVED_TO 0x00000080 /* File was moved to Y */
16 #define FAN_CREATE 0x00000100 /* Subfile was created */
17 #define FAN_DELETE 0x00000200 /* Subfile was deleted */
18 #define FAN_DELETE_SELF 0x00000400 /* Self was deleted */
19 #define FAN_MOVE_SELF 0x00000800 /* Self was moved */
20 #define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
22 #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
24 #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
25 #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
26 #define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */
28 #define FAN_EVENT_ON_CHILD 0x08000000 /* Interested in child events */
30 #define FAN_ONDIR 0x40000000 /* Event occurred against dir */
33 #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
34 #define FAN_MOVE (FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */
36 /* flags used for fanotify_init() */
37 #define FAN_CLOEXEC 0x00000001
38 #define FAN_NONBLOCK 0x00000002
40 /* These are NOT bitwise flags. Both bits are used together. */
41 #define FAN_CLASS_NOTIF 0x00000000
42 #define FAN_CLASS_CONTENT 0x00000004
43 #define FAN_CLASS_PRE_CONTENT 0x00000008
45 /* Deprecated - do not use this in programs and do not add new flags here! */
46 #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
47 FAN_CLASS_PRE_CONTENT)
49 #define FAN_UNLIMITED_QUEUE 0x00000010
50 #define FAN_UNLIMITED_MARKS 0x00000020
51 #define FAN_ENABLE_AUDIT 0x00000040
53 /* Flags to determine fanotify event format */
54 #define FAN_REPORT_PIDFD 0x00000080 /* Report pidfd for event->pid */
55 #define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */
56 #define FAN_REPORT_FID 0x00000200 /* Report unique file id */
57 #define FAN_REPORT_DIR_FID 0x00000400 /* Report unique directory id */
58 #define FAN_REPORT_NAME 0x00000800 /* Report events with name */
60 /* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */
61 #define FAN_REPORT_DFID_NAME (FAN_REPORT_DIR_FID | FAN_REPORT_NAME)
63 /* Deprecated - do not use this in programs and do not add new flags here! */
64 #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
65 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\
68 /* flags used for fanotify_modify_mark() */
69 #define FAN_MARK_ADD 0x00000001
70 #define FAN_MARK_REMOVE 0x00000002
71 #define FAN_MARK_DONT_FOLLOW 0x00000004
72 #define FAN_MARK_ONLYDIR 0x00000008
73 /* FAN_MARK_MOUNT is 0x00000010 */
74 #define FAN_MARK_IGNORED_MASK 0x00000020
75 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040
76 #define FAN_MARK_FLUSH 0x00000080
77 /* FAN_MARK_FILESYSTEM is 0x00000100 */
79 /* These are NOT bitwise flags. Both bits can be used togther. */
80 #define FAN_MARK_INODE 0x00000000
81 #define FAN_MARK_MOUNT 0x00000010
82 #define FAN_MARK_FILESYSTEM 0x00000100
84 /* Deprecated - do not use this in programs and do not add new flags here! */
85 #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
87 FAN_MARK_DONT_FOLLOW |\
90 FAN_MARK_IGNORED_MASK |\
91 FAN_MARK_IGNORED_SURV_MODIFY |\
94 /* Deprecated - do not use this in programs and do not add new flags here! */
95 #define FAN_ALL_EVENTS (FAN_ACCESS |\
101 * All events which require a permission response from userspace
103 /* Deprecated - do not use this in programs and do not add new flags here! */
104 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
107 /* Deprecated - do not use this in programs and do not add new flags here! */
108 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
109 FAN_ALL_PERM_EVENTS |\
112 #define FANOTIFY_METADATA_VERSION 3
114 struct fanotify_event_metadata {
124 #define FAN_EVENT_INFO_TYPE_FID 1
125 #define FAN_EVENT_INFO_TYPE_DFID_NAME 2
126 #define FAN_EVENT_INFO_TYPE_DFID 3
127 #define FAN_EVENT_INFO_TYPE_PIDFD 4
129 /* Variable length info record following event metadata */
130 struct fanotify_event_info_header {
137 * Unique file identifier info record.
138 * This structure is used for records of types FAN_EVENT_INFO_TYPE_FID,
139 * FAN_EVENT_INFO_TYPE_DFID and FAN_EVENT_INFO_TYPE_DFID_NAME.
140 * For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null terminated
141 * name immediately after the file handle.
143 struct fanotify_event_info_fid {
144 struct fanotify_event_info_header hdr;
145 __kernel_fsid_t fsid;
147 * Following is an opaque struct file_handle that can be passed as
148 * an argument to open_by_handle_at(2).
150 unsigned char handle[0];
154 * This structure is used for info records of type FAN_EVENT_INFO_TYPE_PIDFD.
155 * It holds a pidfd for the pid that was responsible for generating an event.
157 struct fanotify_event_info_pidfd {
158 struct fanotify_event_info_header hdr;
162 struct fanotify_response {
167 /* Legit userspace responses to a _PERM event */
168 #define FAN_ALLOW 0x01
169 #define FAN_DENY 0x02
170 #define FAN_AUDIT 0x10 /* Bit mask to create audit record for result */
172 /* No fd set in event */
174 #define FAN_NOPIDFD FAN_NOFD
175 #define FAN_EPIDFD -2
177 /* Helper functions to deal with fanotify_event_metadata buffers */
178 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
180 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
181 (struct fanotify_event_metadata*)(((char *)(meta)) + \
184 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
185 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
186 (long)(meta)->event_len <= (long)(len))
188 #endif /* _UAPI_LINUX_FANOTIFY_H */