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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
607ca46e DH |
2 | #ifndef _UAPI_LINUX_FANOTIFY_H |
3 | #define _UAPI_LINUX_FANOTIFY_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | ||
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 | ||
14 | #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */ | |
15 | ||
16 | #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */ | |
17 | #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */ | |
18 | ||
19 | #define FAN_ONDIR 0x40000000 /* event occurred against dir */ | |
20 | ||
21 | #define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */ | |
22 | ||
23 | /* helper events */ | |
24 | #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */ | |
25 | ||
26 | /* flags used for fanotify_init() */ | |
27 | #define FAN_CLOEXEC 0x00000001 | |
28 | #define FAN_NONBLOCK 0x00000002 | |
29 | ||
30 | /* These are NOT bitwise flags. Both bits are used togther. */ | |
31 | #define FAN_CLASS_NOTIF 0x00000000 | |
32 | #define FAN_CLASS_CONTENT 0x00000004 | |
33 | #define FAN_CLASS_PRE_CONTENT 0x00000008 | |
34 | #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \ | |
35 | FAN_CLASS_PRE_CONTENT) | |
36 | ||
37 | #define FAN_UNLIMITED_QUEUE 0x00000010 | |
38 | #define FAN_UNLIMITED_MARKS 0x00000020 | |
de8cd83e | 39 | #define FAN_ENABLE_AUDIT 0x00000040 |
607ca46e DH |
40 | |
41 | #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \ | |
42 | FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\ | |
43 | FAN_UNLIMITED_MARKS) | |
44 | ||
45 | /* flags used for fanotify_modify_mark() */ | |
46 | #define FAN_MARK_ADD 0x00000001 | |
47 | #define FAN_MARK_REMOVE 0x00000002 | |
48 | #define FAN_MARK_DONT_FOLLOW 0x00000004 | |
49 | #define FAN_MARK_ONLYDIR 0x00000008 | |
50 | #define FAN_MARK_MOUNT 0x00000010 | |
51 | #define FAN_MARK_IGNORED_MASK 0x00000020 | |
52 | #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040 | |
53 | #define FAN_MARK_FLUSH 0x00000080 | |
54 | ||
55 | #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\ | |
56 | FAN_MARK_REMOVE |\ | |
57 | FAN_MARK_DONT_FOLLOW |\ | |
58 | FAN_MARK_ONLYDIR |\ | |
59 | FAN_MARK_MOUNT |\ | |
60 | FAN_MARK_IGNORED_MASK |\ | |
61 | FAN_MARK_IGNORED_SURV_MODIFY |\ | |
62 | FAN_MARK_FLUSH) | |
63 | ||
64 | /* | |
65 | * All of the events - we build the list by hand so that we can add flags in | |
66 | * the future and not break backward compatibility. Apps will get only the | |
67 | * events that they originally wanted. Be sure to add new events here! | |
68 | */ | |
69 | #define FAN_ALL_EVENTS (FAN_ACCESS |\ | |
70 | FAN_MODIFY |\ | |
71 | FAN_CLOSE |\ | |
72 | FAN_OPEN) | |
73 | ||
74 | /* | |
75 | * All events which require a permission response from userspace | |
76 | */ | |
77 | #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\ | |
78 | FAN_ACCESS_PERM) | |
79 | ||
80 | #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\ | |
81 | FAN_ALL_PERM_EVENTS |\ | |
82 | FAN_Q_OVERFLOW) | |
83 | ||
84 | #define FANOTIFY_METADATA_VERSION 3 | |
85 | ||
86 | struct fanotify_event_metadata { | |
87 | __u32 event_len; | |
88 | __u8 vers; | |
89 | __u8 reserved; | |
90 | __u16 metadata_len; | |
91 | __aligned_u64 mask; | |
92 | __s32 fd; | |
93 | __s32 pid; | |
94 | }; | |
95 | ||
96 | struct fanotify_response { | |
97 | __s32 fd; | |
98 | __u32 response; | |
99 | }; | |
100 | ||
101 | /* Legit userspace responses to a _PERM event */ | |
102 | #define FAN_ALLOW 0x01 | |
103 | #define FAN_DENY 0x02 | |
de8cd83e SG |
104 | #define FAN_AUDIT 0x10 /* Bit mask to create audit record for result */ |
105 | ||
607ca46e DH |
106 | /* No fd set in event */ |
107 | #define FAN_NOFD -1 | |
108 | ||
109 | /* Helper functions to deal with fanotify_event_metadata buffers */ | |
110 | #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata)) | |
111 | ||
112 | #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \ | |
113 | (struct fanotify_event_metadata*)(((char *)(meta)) + \ | |
114 | (meta)->event_len)) | |
115 | ||
116 | #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \ | |
117 | (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \ | |
118 | (long)(meta)->event_len <= (long)(len)) | |
119 | ||
120 | #endif /* _UAPI_LINUX_FANOTIFY_H */ |