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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _UAPI_LINUX_FANOTIFY_H #define _UAPI_LINUX_FANOTIFY_H #include <linux/types.h> /* the following events that user-space can register for */ #define FAN_ACCESS 0x00000001 /* File was accessed */ #define FAN_MODIFY 0x00000002 /* File was modified */ #define FAN_ATTRIB 0x00000004 /* Metadata changed */ #define FAN_CLOSE_WRITE 0x00000008 /* Writable file closed */ #define FAN_CLOSE_NOWRITE 0x00000010 /* Unwritable file closed */ #define FAN_OPEN 0x00000020 /* File was opened */ #define FAN_MOVED_FROM 0x00000040 /* File was moved from X */ #define FAN_MOVED_TO 0x00000080 /* File was moved to Y */ #define FAN_CREATE 0x00000100 /* Subfile was created */ #define FAN_DELETE 0x00000200 /* Subfile was deleted */ #define FAN_DELETE_SELF 0x00000400 /* Self was deleted */ #define FAN_MOVE_SELF 0x00000800 /* Self was moved */ #define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */ #define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */ #define FAN_FS_ERROR 0x00008000 /* Filesystem error */ #define FAN_OPEN_PERM 0x00010000 /* File open in perm check */ #define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */ #define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */ /* #define FAN_DIR_MODIFY 0x00080000 */ /* Deprecated (reserved) */ #define FAN_PRE_ACCESS 0x00100000 /* Pre-content access hook */ #define FAN_EVENT_ON_CHILD 0x08000000 /* Interested in child events */ #define FAN_RENAME 0x10000000 /* File was renamed */ #define FAN_ONDIR 0x40000000 /* Event occurred against dir */ /* helper events */ #define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */ #define FAN_MOVE (FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */ /* flags used for fanotify_init() */ #define FAN_CLOEXEC 0x00000001 #define FAN_NONBLOCK 0x00000002 /* These are NOT bitwise flags. Both bits are used together. */ #define FAN_CLASS_NOTIF 0x00000000 #define FAN_CLASS_CONTENT 0x00000004 #define FAN_CLASS_PRE_CONTENT 0x00000008 /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \ FAN_CLASS_PRE_CONTENT) #define FAN_UNLIMITED_QUEUE 0x00000010 #define FAN_UNLIMITED_MARKS 0x00000020 #define FAN_ENABLE_AUDIT 0x00000040 /* Flags to determine fanotify event format */ #define FAN_REPORT_PIDFD 0x00000080 /* Report pidfd for event->pid */ #define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */ #define FAN_REPORT_FID 0x00000200 /* Report unique file id */ #define FAN_REPORT_DIR_FID 0x00000400 /* Report unique directory id */ #define FAN_REPORT_NAME 0x00000800 /* Report events with name */ #define FAN_REPORT_TARGET_FID 0x00001000 /* Report dirent target id */ #define FAN_REPORT_FD_ERROR 0x00002000 /* event->fd can report error */ /* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */ #define FAN_REPORT_DFID_NAME (FAN_REPORT_DIR_FID | FAN_REPORT_NAME) /* Convenience macro - FAN_REPORT_TARGET_FID requires all other FID flags */ #define FAN_REPORT_DFID_NAME_TARGET (FAN_REPORT_DFID_NAME | \ FAN_REPORT_FID | FAN_REPORT_TARGET_FID) /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \ FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\ FAN_UNLIMITED_MARKS) /* flags used for fanotify_modify_mark() */ #define FAN_MARK_ADD 0x00000001 #define FAN_MARK_REMOVE 0x00000002 #define FAN_MARK_DONT_FOLLOW 0x00000004 #define FAN_MARK_ONLYDIR 0x00000008 /* FAN_MARK_MOUNT is 0x00000010 */ #define FAN_MARK_IGNORED_MASK 0x00000020 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040 #define FAN_MARK_FLUSH 0x00000080 /* FAN_MARK_FILESYSTEM is 0x00000100 */ #define FAN_MARK_EVICTABLE 0x00000200 /* This bit is mutually exclusive with FAN_MARK_IGNORED_MASK bit */ #define FAN_MARK_IGNORE 0x00000400 /* These are NOT bitwise flags. Both bits can be used togther. */ #define FAN_MARK_INODE 0x00000000 #define FAN_MARK_MOUNT 0x00000010 #define FAN_MARK_FILESYSTEM 0x00000100 /* * Convenience macro - FAN_MARK_IGNORE requires FAN_MARK_IGNORED_SURV_MODIFY * for non-inode mark types. */ #define FAN_MARK_IGNORE_SURV (FAN_MARK_IGNORE | FAN_MARK_IGNORED_SURV_MODIFY) /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\ FAN_MARK_REMOVE |\ FAN_MARK_DONT_FOLLOW |\ FAN_MARK_ONLYDIR |\ FAN_MARK_MOUNT |\ FAN_MARK_IGNORED_MASK |\ FAN_MARK_IGNORED_SURV_MODIFY |\ FAN_MARK_FLUSH) /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_EVENTS (FAN_ACCESS |\ FAN_MODIFY |\ FAN_CLOSE |\ FAN_OPEN) /* * All events which require a permission response from userspace */ /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\ FAN_ACCESS_PERM) /* Deprecated - do not use this in programs and do not add new flags here! */ #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\ FAN_ALL_PERM_EVENTS |\ FAN_Q_OVERFLOW) #define FANOTIFY_METADATA_VERSION 3 struct fanotify_event_metadata { __u32 event_len; __u8 vers; __u8 reserved; __u16 metadata_len; __aligned_u64 mask; __s32 fd; __s32 pid; }; #define FAN_EVENT_INFO_TYPE_FID 1 #define FAN_EVENT_INFO_TYPE_DFID_NAME 2 #define FAN_EVENT_INFO_TYPE_DFID 3 #define FAN_EVENT_INFO_TYPE_PIDFD 4 #define FAN_EVENT_INFO_TYPE_ERROR 5 #define FAN_EVENT_INFO_TYPE_RANGE 6 /* Special info types for FAN_RENAME */ #define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME 10 /* Reserved for FAN_EVENT_INFO_TYPE_OLD_DFID 11 */ #define FAN_EVENT_INFO_TYPE_NEW_DFID_NAME 12 /* Reserved for FAN_EVENT_INFO_TYPE_NEW_DFID 13 */ /* Variable length info record following event metadata */ struct fanotify_event_info_header { __u8 info_type; __u8 pad; __u16 len; }; /* * Unique file identifier info record. * This structure is used for records of types FAN_EVENT_INFO_TYPE_FID, * FAN_EVENT_INFO_TYPE_DFID and FAN_EVENT_INFO_TYPE_DFID_NAME. * For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null terminated * name immediately after the file handle. */ struct fanotify_event_info_fid { struct fanotify_event_info_header hdr; __kernel_fsid_t fsid; /* * Following is an opaque struct file_handle that can be passed as * an argument to open_by_handle_at(2). */ unsigned char handle[]; }; /* * This structure is used for info records of type FAN_EVENT_INFO_TYPE_PIDFD. * It holds a pidfd for the pid that was responsible for generating an event. */ struct fanotify_event_info_pidfd { struct fanotify_event_info_header hdr; __s32 pidfd; }; struct fanotify_event_info_error { struct fanotify_event_info_header hdr; __s32 error; __u32 error_count; }; struct fanotify_event_info_range { struct fanotify_event_info_header hdr; __u32 pad; __u64 offset; __u64 count; }; /* * User space may need to record additional information about its decision. * The extra information type records what kind of information is included. * The default is none. We also define an extra information buffer whose * size is determined by the extra information type. * * If the information type is Audit Rule, then the information following * is the rule number that triggered the user space decision that * requires auditing. */ #define FAN_RESPONSE_INFO_NONE 0 #define FAN_RESPONSE_INFO_AUDIT_RULE 1 struct fanotify_response { __s32 fd; __u32 response; }; struct fanotify_response_info_header { __u8 type; __u8 pad; __u16 len; }; struct fanotify_response_info_audit_rule { struct fanotify_response_info_header hdr; __u32 rule_number; __u32 subj_trust; __u32 obj_trust; }; /* Legit userspace responses to a _PERM event */ #define FAN_ALLOW 0x01 #define FAN_DENY 0x02 /* errno other than EPERM can specified in upper byte of deny response */ #define FAN_ERRNO_BITS 8 #define FAN_ERRNO_SHIFT (32 - FAN_ERRNO_BITS) #define FAN_ERRNO_MASK ((1 << FAN_ERRNO_BITS) - 1) #define FAN_DENY_ERRNO(err) \ (FAN_DENY | ((((__u32)(err)) & FAN_ERRNO_MASK) << FAN_ERRNO_SHIFT)) #define FAN_AUDIT 0x10 /* Bitmask to create audit record for result */ #define FAN_INFO 0x20 /* Bitmask to indicate additional information */ /* No fd set in event */ #define FAN_NOFD -1 #define FAN_NOPIDFD FAN_NOFD #define FAN_EPIDFD -2 /* Helper functions to deal with fanotify_event_metadata buffers */ #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata)) #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \ (struct fanotify_event_metadata*)(((char *)(meta)) + \ (meta)->event_len)) #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \ (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \ (long)(meta)->event_len <= (long)(len)) #endif /* _UAPI_LINUX_FANOTIFY_H */