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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI_LINUX_FANOTIFY_H3#define _UAPI_LINUX_FANOTIFY_H4 5#include <linux/types.h>6 7/* the following events that user-space can register for */8#define FAN_ACCESS		0x00000001	/* File was accessed */9#define FAN_MODIFY		0x00000002	/* File was modified */10#define FAN_ATTRIB		0x00000004	/* Metadata changed */11#define FAN_CLOSE_WRITE		0x00000008	/* Writable file closed */12#define FAN_CLOSE_NOWRITE	0x00000010	/* Unwritable file closed */13#define FAN_OPEN		0x00000020	/* File was opened */14#define FAN_MOVED_FROM		0x00000040	/* File was moved from X */15#define FAN_MOVED_TO		0x00000080	/* File was moved to Y */16#define FAN_CREATE		0x00000100	/* Subfile was created */17#define FAN_DELETE		0x00000200	/* Subfile was deleted */18#define FAN_DELETE_SELF		0x00000400	/* Self was deleted */19#define FAN_MOVE_SELF		0x00000800	/* Self was moved */20#define FAN_OPEN_EXEC		0x00001000	/* File was opened for exec */21 22#define FAN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */23#define FAN_FS_ERROR		0x00008000	/* Filesystem error */24 25#define FAN_OPEN_PERM		0x00010000	/* File open in perm check */26#define FAN_ACCESS_PERM		0x00020000	/* File accessed in perm check */27#define FAN_OPEN_EXEC_PERM	0x00040000	/* File open/exec in perm check */28 29#define FAN_EVENT_ON_CHILD	0x08000000	/* Interested in child events */30 31#define FAN_RENAME		0x10000000	/* File was renamed */32 33#define FAN_ONDIR		0x40000000	/* Event occurred against dir */34 35/* helper events */36#define FAN_CLOSE		(FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */37#define FAN_MOVE		(FAN_MOVED_FROM | FAN_MOVED_TO) /* moves */38 39/* flags used for fanotify_init() */40#define FAN_CLOEXEC		0x0000000141#define FAN_NONBLOCK		0x0000000242 43/* These are NOT bitwise flags.  Both bits are used together.  */44#define FAN_CLASS_NOTIF		0x0000000045#define FAN_CLASS_CONTENT	0x0000000446#define FAN_CLASS_PRE_CONTENT	0x0000000847 48/* Deprecated - do not use this in programs and do not add new flags here! */49#define FAN_ALL_CLASS_BITS	(FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \50				 FAN_CLASS_PRE_CONTENT)51 52#define FAN_UNLIMITED_QUEUE	0x0000001053#define FAN_UNLIMITED_MARKS	0x0000002054#define FAN_ENABLE_AUDIT	0x0000004055 56/* Flags to determine fanotify event format */57#define FAN_REPORT_PIDFD	0x00000080	/* Report pidfd for event->pid */58#define FAN_REPORT_TID		0x00000100	/* event->pid is thread id */59#define FAN_REPORT_FID		0x00000200	/* Report unique file id */60#define FAN_REPORT_DIR_FID	0x00000400	/* Report unique directory id */61#define FAN_REPORT_NAME		0x00000800	/* Report events with name */62#define FAN_REPORT_TARGET_FID	0x00001000	/* Report dirent target id  */63 64/* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */65#define FAN_REPORT_DFID_NAME	(FAN_REPORT_DIR_FID | FAN_REPORT_NAME)66/* Convenience macro - FAN_REPORT_TARGET_FID requires all other FID flags */67#define FAN_REPORT_DFID_NAME_TARGET (FAN_REPORT_DFID_NAME | \68				     FAN_REPORT_FID | FAN_REPORT_TARGET_FID)69 70/* Deprecated - do not use this in programs and do not add new flags here! */71#define FAN_ALL_INIT_FLAGS	(FAN_CLOEXEC | FAN_NONBLOCK | \72				 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\73				 FAN_UNLIMITED_MARKS)74 75/* flags used for fanotify_modify_mark() */76#define FAN_MARK_ADD		0x0000000177#define FAN_MARK_REMOVE		0x0000000278#define FAN_MARK_DONT_FOLLOW	0x0000000479#define FAN_MARK_ONLYDIR	0x0000000880/* FAN_MARK_MOUNT is		0x00000010 */81#define FAN_MARK_IGNORED_MASK	0x0000002082#define FAN_MARK_IGNORED_SURV_MODIFY	0x0000004083#define FAN_MARK_FLUSH		0x0000008084/* FAN_MARK_FILESYSTEM is	0x00000100 */85#define FAN_MARK_EVICTABLE	0x0000020086/* This bit is mutually exclusive with FAN_MARK_IGNORED_MASK bit */87#define FAN_MARK_IGNORE		0x0000040088 89/* These are NOT bitwise flags.  Both bits can be used togther.  */90#define FAN_MARK_INODE		0x0000000091#define FAN_MARK_MOUNT		0x0000001092#define FAN_MARK_FILESYSTEM	0x0000010093 94/*95 * Convenience macro - FAN_MARK_IGNORE requires FAN_MARK_IGNORED_SURV_MODIFY96 * for non-inode mark types.97 */98#define FAN_MARK_IGNORE_SURV	(FAN_MARK_IGNORE | FAN_MARK_IGNORED_SURV_MODIFY)99 100/* Deprecated - do not use this in programs and do not add new flags here! */101#define FAN_ALL_MARK_FLAGS	(FAN_MARK_ADD |\102				 FAN_MARK_REMOVE |\103				 FAN_MARK_DONT_FOLLOW |\104				 FAN_MARK_ONLYDIR |\105				 FAN_MARK_MOUNT |\106				 FAN_MARK_IGNORED_MASK |\107				 FAN_MARK_IGNORED_SURV_MODIFY |\108				 FAN_MARK_FLUSH)109 110/* Deprecated - do not use this in programs and do not add new flags here! */111#define FAN_ALL_EVENTS (FAN_ACCESS |\112			FAN_MODIFY |\113			FAN_CLOSE |\114			FAN_OPEN)115 116/*117 * All events which require a permission response from userspace118 */119/* Deprecated - do not use this in programs and do not add new flags here! */120#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\121			     FAN_ACCESS_PERM)122 123/* Deprecated - do not use this in programs and do not add new flags here! */124#define FAN_ALL_OUTGOING_EVENTS	(FAN_ALL_EVENTS |\125				 FAN_ALL_PERM_EVENTS |\126				 FAN_Q_OVERFLOW)127 128#define FANOTIFY_METADATA_VERSION	3129 130struct fanotify_event_metadata {131	__u32 event_len;132	__u8 vers;133	__u8 reserved;134	__u16 metadata_len;135	__aligned_u64 mask;136	__s32 fd;137	__s32 pid;138};139 140#define FAN_EVENT_INFO_TYPE_FID		1141#define FAN_EVENT_INFO_TYPE_DFID_NAME	2142#define FAN_EVENT_INFO_TYPE_DFID	3143#define FAN_EVENT_INFO_TYPE_PIDFD	4144#define FAN_EVENT_INFO_TYPE_ERROR	5145 146/* Special info types for FAN_RENAME */147#define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME	10148/* Reserved for FAN_EVENT_INFO_TYPE_OLD_DFID	11 */149#define FAN_EVENT_INFO_TYPE_NEW_DFID_NAME	12150/* Reserved for FAN_EVENT_INFO_TYPE_NEW_DFID	13 */151 152/* Variable length info record following event metadata */153struct fanotify_event_info_header {154	__u8 info_type;155	__u8 pad;156	__u16 len;157};158 159/*160 * Unique file identifier info record.161 * This structure is used for records of types FAN_EVENT_INFO_TYPE_FID,162 * FAN_EVENT_INFO_TYPE_DFID and FAN_EVENT_INFO_TYPE_DFID_NAME.163 * For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null terminated164 * name immediately after the file handle.165 */166struct fanotify_event_info_fid {167	struct fanotify_event_info_header hdr;168	__kernel_fsid_t fsid;169	/*170	 * Following is an opaque struct file_handle that can be passed as171	 * an argument to open_by_handle_at(2).172	 */173	unsigned char handle[];174};175 176/*177 * This structure is used for info records of type FAN_EVENT_INFO_TYPE_PIDFD.178 * It holds a pidfd for the pid that was responsible for generating an event.179 */180struct fanotify_event_info_pidfd {181	struct fanotify_event_info_header hdr;182	__s32 pidfd;183};184 185struct fanotify_event_info_error {186	struct fanotify_event_info_header hdr;187	__s32 error;188	__u32 error_count;189};190 191/*192 * User space may need to record additional information about its decision.193 * The extra information type records what kind of information is included.194 * The default is none. We also define an extra information buffer whose195 * size is determined by the extra information type.196 *197 * If the information type is Audit Rule, then the information following198 * is the rule number that triggered the user space decision that199 * requires auditing.200 */201 202#define FAN_RESPONSE_INFO_NONE		0203#define FAN_RESPONSE_INFO_AUDIT_RULE	1204 205struct fanotify_response {206	__s32 fd;207	__u32 response;208};209 210struct fanotify_response_info_header {211	__u8 type;212	__u8 pad;213	__u16 len;214};215 216struct fanotify_response_info_audit_rule {217	struct fanotify_response_info_header hdr;218	__u32 rule_number;219	__u32 subj_trust;220	__u32 obj_trust;221};222 223/* Legit userspace responses to a _PERM event */224#define FAN_ALLOW	0x01225#define FAN_DENY	0x02226#define FAN_AUDIT	0x10	/* Bitmask to create audit record for result */227#define FAN_INFO	0x20	/* Bitmask to indicate additional information */228 229/* No fd set in event */230#define FAN_NOFD	-1231#define FAN_NOPIDFD	FAN_NOFD232#define FAN_EPIDFD	-2233 234/* Helper functions to deal with fanotify_event_metadata buffers */235#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))236 237#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \238				   (struct fanotify_event_metadata*)(((char *)(meta)) + \239				   (meta)->event_len))240 241#define FAN_EVENT_OK(meta, len)	((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \242				(long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \243				(long)(meta)->event_len <= (long)(len))244 245#endif /* _UAPI_LINUX_FANOTIFY_H */246