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Report event FAN_DIR_MODIFY with name in a variable length record similar to how fid's are reported. With name info reporting implemented, setting FAN_DIR_MODIFY in mark mask is now allowed. When events are reported with name, the reported fid identifies the directory and the name follows the fid. The info record type for this event info is FAN_EVENT_INFO_TYPE_DFID_NAME. For now, all reported events have at most one info record which is either FAN_EVENT_INFO_TYPE_FID or FAN_EVENT_INFO_TYPE_DFID_NAME (for FAN_DIR_MODIFY). Later on, events "on child" will report both records. There are several ways that an application can use this information: 1. When watching a single directory, the name is always relative to the watched directory, so application need to fstatat(2) the name relative to the watched directory. 2. When watching a set of directories, the application could keep a map of dirfd for all watched directories and hash the map by fid obtained with name_to_handle_at(2). When getting a name event, the fid in the event info could be used to lookup the base dirfd in the map and then call fstatat(2) with that dirfd. 3. When watching a filesystem (FAN_MARK_FILESYSTEM) or a large set of directories, the application could use open_by_handle_at(2) with the fid in event info to obtain dirfd for the directory where event happened and call fstatat(2) with this dirfd. The last option scales better for a large number of watched directories. The first two options may be available in the future also for non privileged fanotify watchers, because open_by_handle_at(2) requires the CAP_DAC_READ_SEARCH capability. Link: https://lore.kernel.org/r/20200319151022.31456-15-amir73il@gmail.com Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
170 lines
5.6 KiB
C
170 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_FANOTIFY_H
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#define _UAPI_LINUX_FANOTIFY_H
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#include <linux/types.h>
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/* the following events that user-space can register for */
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#define FAN_ACCESS 0x00000001 /* File was accessed */
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#define FAN_MODIFY 0x00000002 /* File was modified */
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#define FAN_ATTRIB 0x00000004 /* Metadata changed */
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#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
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#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
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#define FAN_OPEN 0x00000020 /* File was opened */
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#define FAN_MOVED_FROM 0x00000040 /* File was moved from X */
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#define FAN_MOVED_TO 0x00000080 /* File was moved to Y */
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#define FAN_CREATE 0x00000100 /* Subfile was created */
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#define FAN_DELETE 0x00000200 /* Subfile was deleted */
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#define FAN_DELETE_SELF 0x00000400 /* Self was deleted */
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#define FAN_MOVE_SELF 0x00000800 /* Self was moved */
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#define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
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#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
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#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
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#define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
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#define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */
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#define FAN_DIR_MODIFY 0x00080000 /* Directory entry was modified */
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#define FAN_EVENT_ON_CHILD 0x08000000 /* Interested in child events */
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#define FAN_ONDIR 0x40000000 /* Event occurred against dir */
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/* helper events */
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#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
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#define FAN_MOVE (FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */
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/* flags used for fanotify_init() */
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#define FAN_CLOEXEC 0x00000001
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#define FAN_NONBLOCK 0x00000002
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/* These are NOT bitwise flags. Both bits are used together. */
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#define FAN_CLASS_NOTIF 0x00000000
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#define FAN_CLASS_CONTENT 0x00000004
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#define FAN_CLASS_PRE_CONTENT 0x00000008
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
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FAN_CLASS_PRE_CONTENT)
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#define FAN_UNLIMITED_QUEUE 0x00000010
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#define FAN_UNLIMITED_MARKS 0x00000020
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#define FAN_ENABLE_AUDIT 0x00000040
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/* Flags to determine fanotify event format */
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#define FAN_REPORT_TID 0x00000100 /* event->pid is thread id */
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#define FAN_REPORT_FID 0x00000200 /* Report unique file id */
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
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FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\
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FAN_UNLIMITED_MARKS)
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/* flags used for fanotify_modify_mark() */
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#define FAN_MARK_ADD 0x00000001
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#define FAN_MARK_REMOVE 0x00000002
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#define FAN_MARK_DONT_FOLLOW 0x00000004
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#define FAN_MARK_ONLYDIR 0x00000008
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/* FAN_MARK_MOUNT is 0x00000010 */
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#define FAN_MARK_IGNORED_MASK 0x00000020
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#define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040
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#define FAN_MARK_FLUSH 0x00000080
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/* FAN_MARK_FILESYSTEM is 0x00000100 */
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/* These are NOT bitwise flags. Both bits can be used togther. */
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#define FAN_MARK_INODE 0x00000000
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#define FAN_MARK_MOUNT 0x00000010
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#define FAN_MARK_FILESYSTEM 0x00000100
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
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FAN_MARK_REMOVE |\
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FAN_MARK_DONT_FOLLOW |\
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FAN_MARK_ONLYDIR |\
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FAN_MARK_MOUNT |\
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FAN_MARK_IGNORED_MASK |\
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FAN_MARK_IGNORED_SURV_MODIFY |\
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FAN_MARK_FLUSH)
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_EVENTS (FAN_ACCESS |\
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FAN_MODIFY |\
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FAN_CLOSE |\
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FAN_OPEN)
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/*
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* All events which require a permission response from userspace
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*/
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
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FAN_ACCESS_PERM)
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/* Deprecated - do not use this in programs and do not add new flags here! */
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#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
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FAN_ALL_PERM_EVENTS |\
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FAN_Q_OVERFLOW)
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#define FANOTIFY_METADATA_VERSION 3
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struct fanotify_event_metadata {
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__u32 event_len;
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__u8 vers;
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__u8 reserved;
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__u16 metadata_len;
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__aligned_u64 mask;
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__s32 fd;
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__s32 pid;
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};
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#define FAN_EVENT_INFO_TYPE_FID 1
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#define FAN_EVENT_INFO_TYPE_DFID_NAME 2
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/* Variable length info record following event metadata */
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struct fanotify_event_info_header {
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__u8 info_type;
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__u8 pad;
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__u16 len;
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};
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/*
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* Unique file identifier info record. This is used both for
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* FAN_EVENT_INFO_TYPE_FID records and for FAN_EVENT_INFO_TYPE_DFID_NAME
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* records. For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null
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* terminated name immediately after the file handle.
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*/
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struct fanotify_event_info_fid {
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struct fanotify_event_info_header hdr;
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__kernel_fsid_t fsid;
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/*
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* Following is an opaque struct file_handle that can be passed as
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* an argument to open_by_handle_at(2).
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*/
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unsigned char handle[0];
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};
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struct fanotify_response {
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__s32 fd;
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__u32 response;
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};
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/* Legit userspace responses to a _PERM event */
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#define FAN_ALLOW 0x01
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#define FAN_DENY 0x02
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#define FAN_AUDIT 0x10 /* Bit mask to create audit record for result */
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/* No fd set in event */
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#define FAN_NOFD -1
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/* Helper functions to deal with fanotify_event_metadata buffers */
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#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
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#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
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(struct fanotify_event_metadata*)(((char *)(meta)) + \
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(meta)->event_len))
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#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
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(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
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(long)(meta)->event_len <= (long)(len))
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#endif /* _UAPI_LINUX_FANOTIFY_H */
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