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_CLOSE_WRITE 0x00000008 /* Writtable file closed */
11 #define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
12 #define FAN_OPEN 0x00000020 /* File was opened */
13 #define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
15 #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
17 #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
18 #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
19 #define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */
21 #define FAN_ONDIR 0x40000000 /* event occurred against dir */
23 #define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
26 #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
28 /* flags used for fanotify_init() */
29 #define FAN_CLOEXEC 0x00000001
30 #define FAN_NONBLOCK 0x00000002
32 /* These are NOT bitwise flags. Both bits are used together. */
33 #define FAN_CLASS_NOTIF 0x00000000
34 #define FAN_CLASS_CONTENT 0x00000004
35 #define FAN_CLASS_PRE_CONTENT 0x00000008
37 /* Deprecated - do not use this in programs and do not add new flags here! */
38 #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
39 FAN_CLASS_PRE_CONTENT)
41 #define FAN_UNLIMITED_QUEUE 0x00000010
42 #define FAN_UNLIMITED_MARKS 0x00000020
43 #define FAN_ENABLE_AUDIT 0x00000040
45 /* Flags to determine fanotify event format */
46 #define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */
47 #define FAN_REPORT_FID 0x00000200 /* Report unique file id */
49 /* Deprecated - do not use this in programs and do not add new flags here! */
50 #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
51 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\
54 /* flags used for fanotify_modify_mark() */
55 #define FAN_MARK_ADD 0x00000001
56 #define FAN_MARK_REMOVE 0x00000002
57 #define FAN_MARK_DONT_FOLLOW 0x00000004
58 #define FAN_MARK_ONLYDIR 0x00000008
59 /* FAN_MARK_MOUNT is 0x00000010 */
60 #define FAN_MARK_IGNORED_MASK 0x00000020
61 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040
62 #define FAN_MARK_FLUSH 0x00000080
63 /* FAN_MARK_FILESYSTEM is 0x00000100 */
65 /* These are NOT bitwise flags. Both bits can be used togther. */
66 #define FAN_MARK_INODE 0x00000000
67 #define FAN_MARK_MOUNT 0x00000010
68 #define FAN_MARK_FILESYSTEM 0x00000100
70 /* Deprecated - do not use this in programs and do not add new flags here! */
71 #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
73 FAN_MARK_DONT_FOLLOW |\
76 FAN_MARK_IGNORED_MASK |\
77 FAN_MARK_IGNORED_SURV_MODIFY |\
80 /* Deprecated - do not use this in programs and do not add new flags here! */
81 #define FAN_ALL_EVENTS (FAN_ACCESS |\
87 * All events which require a permission response from userspace
89 /* Deprecated - do not use this in programs and do not add new flags here! */
90 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
93 /* Deprecated - do not use this in programs and do not add new flags here! */
94 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
95 FAN_ALL_PERM_EVENTS |\
98 #define FANOTIFY_METADATA_VERSION 3
100 struct fanotify_event_metadata {
110 #define FAN_EVENT_INFO_TYPE_FID 1
112 /* Variable length info record following event metadata */
113 struct fanotify_event_info_header {
119 /* Unique file identifier info record */
120 struct fanotify_event_info_fid {
121 struct fanotify_event_info_header hdr;
122 __kernel_fsid_t fsid;
124 * Following is an opaque struct file_handle that can be passed as
125 * an argument to open_by_handle_at(2).
127 unsigned char handle[0];
130 struct fanotify_response {
135 /* Legit userspace responses to a _PERM event */
136 #define FAN_ALLOW 0x01
137 #define FAN_DENY 0x02
138 #define FAN_AUDIT 0x10 /* Bit mask to create audit record for result */
140 /* No fd set in event */
143 /* Helper functions to deal with fanotify_event_metadata buffers */
144 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
146 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
147 (struct fanotify_event_metadata*)(((char *)(meta)) + \
150 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
151 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
152 (long)(meta)->event_len <= (long)(len))
154 #endif /* _UAPI_LINUX_FANOTIFY_H */