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62731fa0c8
To implement per event type optional headers we are interested in knowing how long the metadata structure is. This patch slits the __u32 version field into a __u8 version and a __u16 metadata_len field (with __u8 left over). This should allow for backwards compat ABI. Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com> [rewrote descrtion and changed object sizes and ordering - eparis] Signed-off-by: Eric Paris <eparis@redhat.com>
121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
#ifndef _LINUX_FANOTIFY_H
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#define _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_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_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_ONDIR 0x40000000 /* event occurred against dir */
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#define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
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/* helper events */
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#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
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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 togther. */
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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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#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_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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#define FAN_MARK_MOUNT 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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#ifdef __KERNEL__
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/* not valid from userspace, only kernel internal */
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#define FAN_MARK_ONDIR 0x00000100
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#endif
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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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/*
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* All of the events - we build the list by hand so that we can add flags in
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* the future and not break backward compatibility. Apps will get only the
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* events that they originally wanted. Be sure to add new events here!
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*/
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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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#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
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FAN_ACCESS_PERM)
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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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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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/* 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 /* _LINUX_FANOTIFY_H */
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