include/linux/fanotify.h

   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 #ifdef __KERNEL__
  53 /* not valid from userspace, only kernel internal */
  54 #define FAN_MARK_ONDIR          0x00000100
  55 #endif
  56
  57 #define FAN_ALL_MARK_FLAGS      (FAN_MARK_ADD |\
  58                                  FAN_MARK_REMOVE |\
  59                                  FAN_MARK_DONT_FOLLOW |\
  60                                  FAN_MARK_ONLYDIR |\
  61                                  FAN_MARK_MOUNT |\
  62                                  FAN_MARK_IGNORED_MASK |\
  63                                  FAN_MARK_IGNORED_SURV_MODIFY |\
  64                                  FAN_MARK_FLUSH)
  65
  66 /*
  67  * All of the events - we build the list by hand so that we can add flags in
  68  * the future and not break backward compatibility.  Apps will get only the
  69  * events that they originally wanted.  Be sure to add new events here!
  70  */
  71 #define FAN_ALL_EVENTS (FAN_ACCESS |\
  72                         FAN_MODIFY |\
  73                         FAN_CLOSE |\
  74                         FAN_OPEN)
  75
  76 /*
  77  * All events which require a permission response from userspace
  78  */
  79 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
  80                              FAN_ACCESS_PERM)
  81
  82 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
  83                                  FAN_ALL_PERM_EVENTS |\
  84                                  FAN_Q_OVERFLOW)
  85
  86 #define FANOTIFY_METADATA_VERSION       3
  87
  88 struct fanotify_event_metadata {
  89         __u32 event_len;
  90         __u8 vers;
  91         __u8 reserved;
  92         __u16 metadata_len;
  93         __aligned_u64 mask;
  94         __s32 fd;
  95         __s32 pid;
  96 };
  97
  98 struct fanotify_response {
  99         __s32 fd;
 100         __u32 response;
 101 };
 102
 103 /* Legit userspace responses to a _PERM event */
 104 #define FAN_ALLOW       0x01
 105 #define FAN_DENY        0x02
 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 /* _LINUX_FANOTIFY_H */