include/linux/fanotify.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_FANOTIFY_H
   3 #define _LINUX_FANOTIFY_H
   4
   5 #include <linux/sysctl.h>
   6 #include <uapi/linux/fanotify.h>
   7
   8 extern struct ctl_table fanotify_table[]; /* for sysctl */
   9
  10 #define FAN_GROUP_FLAG(group, flag) \
  11         ((group)->fanotify_data.flags & (flag))
  12
  13 /*
  14  * Flags allowed to be passed from/to userspace.
  15  *
  16  * We intentionally do not add new bits to the old FAN_ALL_* constants, because
  17  * they are uapi exposed constants. If there are programs out there using
  18  * these constant, the programs may break if re-compiled with new uapi headers
  19  * and then run on an old kernel.
  20  */
  21
  22 /* Group classes where permission events are allowed */
  23 #define FANOTIFY_PERM_CLASSES   (FAN_CLASS_CONTENT | \
  24                                  FAN_CLASS_PRE_CONTENT)
  25
  26 #define FANOTIFY_CLASS_BITS     (FAN_CLASS_NOTIF | FANOTIFY_PERM_CLASSES)
  27
  28 #define FANOTIFY_FID_BITS       (FAN_REPORT_FID | FAN_REPORT_DFID_NAME)
  29
  30 #define FANOTIFY_INFO_MODES     (FANOTIFY_FID_BITS | FAN_REPORT_PIDFD)
  31
  32 /*
  33  * fanotify_init() flags that require CAP_SYS_ADMIN.
  34  * We do not allow unprivileged groups to request permission events.
  35  * We do not allow unprivileged groups to get other process pid in events.
  36  * We do not allow unprivileged groups to use unlimited resources.
  37  */
  38 #define FANOTIFY_ADMIN_INIT_FLAGS       (FANOTIFY_PERM_CLASSES | \
  39                                          FAN_REPORT_TID | \
  40                                          FAN_REPORT_PIDFD | \
  41                                          FAN_UNLIMITED_QUEUE | \
  42                                          FAN_UNLIMITED_MARKS)
  43
  44 /*
  45  * fanotify_init() flags that are allowed for user without CAP_SYS_ADMIN.
  46  * FAN_CLASS_NOTIF is the only class we allow for unprivileged group.
  47  * We do not allow unprivileged groups to get file descriptors in events,
  48  * so one of the flags for reporting file handles is required.
  49  */
  50 #define FANOTIFY_USER_INIT_FLAGS        (FAN_CLASS_NOTIF | \
  51                                          FANOTIFY_FID_BITS | \
  52                                          FAN_CLOEXEC | FAN_NONBLOCK)
  53
  54 #define FANOTIFY_INIT_FLAGS     (FANOTIFY_ADMIN_INIT_FLAGS | \
  55                                  FANOTIFY_USER_INIT_FLAGS)
  56
  57 /* Internal group flags */
  58 #define FANOTIFY_UNPRIV         0x80000000
  59 #define FANOTIFY_INTERNAL_GROUP_FLAGS   (FANOTIFY_UNPRIV)
  60
  61 #define FANOTIFY_MARK_TYPE_BITS (FAN_MARK_INODE | FAN_MARK_MOUNT | \
  62                                  FAN_MARK_FILESYSTEM)
  63
  64 #define FANOTIFY_MARK_FLAGS     (FANOTIFY_MARK_TYPE_BITS | \
  65                                  FAN_MARK_ADD | \
  66                                  FAN_MARK_REMOVE | \
  67                                  FAN_MARK_DONT_FOLLOW | \
  68                                  FAN_MARK_ONLYDIR | \
  69                                  FAN_MARK_IGNORED_MASK | \
  70                                  FAN_MARK_IGNORED_SURV_MODIFY | \
  71                                  FAN_MARK_FLUSH)
  72
  73 /*
  74  * Events that can be reported with data type FSNOTIFY_EVENT_PATH.
  75  * Note that FAN_MODIFY can also be reported with data type
  76  * FSNOTIFY_EVENT_INODE.
  77  */
  78 #define FANOTIFY_PATH_EVENTS    (FAN_ACCESS | FAN_MODIFY | \
  79                                  FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC)
  80
  81 /*
  82  * Directory entry modification events - reported only to directory
  83  * where entry is modified and not to a watching parent.
  84  */
  85 #define FANOTIFY_DIRENT_EVENTS  (FAN_MOVE | FAN_CREATE | FAN_DELETE)
  86
  87 /* Events that can only be reported with data type FSNOTIFY_EVENT_INODE */
  88 #define FANOTIFY_INODE_EVENTS   (FANOTIFY_DIRENT_EVENTS | \
  89                                  FAN_ATTRIB | FAN_MOVE_SELF | FAN_DELETE_SELF)
  90
  91 /* Events that user can request to be notified on */
  92 #define FANOTIFY_EVENTS         (FANOTIFY_PATH_EVENTS | \
  93                                  FANOTIFY_INODE_EVENTS)
  94
  95 /* Events that require a permission response from user */
  96 #define FANOTIFY_PERM_EVENTS    (FAN_OPEN_PERM | FAN_ACCESS_PERM | \
  97                                  FAN_OPEN_EXEC_PERM)
  98
  99 /* Extra flags that may be reported with event or control handling of events */
 100 #define FANOTIFY_EVENT_FLAGS    (FAN_EVENT_ON_CHILD | FAN_ONDIR)
 101
 102 /* Events that may be reported to user */
 103 #define FANOTIFY_OUTGOING_EVENTS        (FANOTIFY_EVENTS | \
 104                                          FANOTIFY_PERM_EVENTS | \
 105                                          FAN_Q_OVERFLOW | FAN_ONDIR)
 106
 107 #define ALL_FANOTIFY_EVENT_BITS         (FANOTIFY_OUTGOING_EVENTS | \
 108                                          FANOTIFY_EVENT_FLAGS)
 109
 110 /* Do not use these old uapi constants internally */
 111 #undef FAN_ALL_CLASS_BITS
 112 #undef FAN_ALL_INIT_FLAGS
 113 #undef FAN_ALL_MARK_FLAGS
 114 #undef FAN_ALL_EVENTS
 115 #undef FAN_ALL_PERM_EVENTS
 116 #undef FAN_ALL_OUTGOING_EVENTS
 117
 118 #endif /* _LINUX_FANOTIFY_H */