1 #ifndef _LINUX_FANOTIFY_H 2 #define _LINUX_FANOTIFY_H 3 4 #include <linux/types.h> 5 6 /* the following events that user-space can register for */ 7 #define FAN_ACCESS 0x00000001 /* File was accessed */ 8 #define FAN_MODIFY 0x00000002 /* File was modified */ 9 #define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */ 10 #define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */ 11 #define FAN_OPEN 0x00000020 /* File was opened */ 12 13 #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */ 14 15 #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */ 16 #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */ 17 18 #define FAN_ONDIR 0x40000000 /* event occurred against dir */ 19 20 #define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */ 21 22 /* helper events */ 23 #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */ 24 25 /* flags used for fanotify_init() */ 26 #define FAN_CLOEXEC 0x00000001 27 #define FAN_NONBLOCK 0x00000002 28 29 /* These are NOT bitwise flags. Both bits are used togther. */ 30 #define FAN_CLASS_NOTIF 0x00000000 31 #define FAN_CLASS_CONTENT 0x00000004 32 #define FAN_CLASS_PRE_CONTENT 0x00000008 33 #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \ 34 FAN_CLASS_PRE_CONTENT) 35 36 #define FAN_UNLIMITED_QUEUE 0x00000010 37 #define FAN_UNLIMITED_MARKS 0x00000020 38 39 #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \ 40 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\ 41 FAN_UNLIMITED_MARKS) 42 43 /* flags used for fanotify_modify_mark() */ 44 #define FAN_MARK_ADD 0x00000001 45 #define FAN_MARK_REMOVE 0x00000002 46 #define FAN_MARK_DONT_FOLLOW 0x00000004 47 #define FAN_MARK_ONLYDIR 0x00000008 48 #define FAN_MARK_MOUNT 0x00000010 49 #define FAN_MARK_IGNORED_MASK 0x00000020 50 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040 51 #define FAN_MARK_FLUSH 0x00000080 52 53 #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\ 54 FAN_MARK_REMOVE |\ 55 FAN_MARK_DONT_FOLLOW |\ 56 FAN_MARK_ONLYDIR |\ 57 FAN_MARK_MOUNT |\ 58 FAN_MARK_IGNORED_MASK |\ 59 FAN_MARK_IGNORED_SURV_MODIFY |\ 60 FAN_MARK_FLUSH) 61 62 /* 63 * All of the events - we build the list by hand so that we can add flags in 64 * the future and not break backward compatibility. Apps will get only the 65 * events that they originally wanted. Be sure to add new events here! 66 */ 67 #define FAN_ALL_EVENTS (FAN_ACCESS |\ 68 FAN_MODIFY |\ 69 FAN_CLOSE |\ 70 FAN_OPEN) 71 72 /* 73 * All events which require a permission response from userspace 74 */ 75 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\ 76 FAN_ACCESS_PERM) 77 78 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\ 79 FAN_ALL_PERM_EVENTS |\ 80 FAN_Q_OVERFLOW) 81 82 #define FANOTIFY_METADATA_VERSION 3 83 84 struct fanotify_event_metadata { 85 __u32 event_len; 86 __u8 vers; 87 __u8 reserved; 88 __u16 metadata_len; 89 __aligned_u64 mask; 90 __s32 fd; 91 __s32 pid; 92 }; 93 94 struct fanotify_response { 95 __s32 fd; 96 __u32 response; 97 }; 98 99 /* Legit userspace responses to a _PERM event */ 100 #define FAN_ALLOW 0x01 101 #define FAN_DENY 0x02 102 /* No fd set in event */ 103 #define FAN_NOFD -1 104 105 /* Helper functions to deal with fanotify_event_metadata buffers */ 106 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata)) 107 108 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \ 109 (struct fanotify_event_metadata*)(((char *)(meta)) + \ 110 (meta)->event_len)) 111 112 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \ 113 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \ 114 (long)(meta)->event_len <= (long)(len)) 115 116 #endif /* _LINUX_FANOTIFY_H */ 117
