fanotify.h (8367B) - Raw
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _LINUX_FANOTIFY_H 3 #define _LINUX_FANOTIFY_H 4 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 0x00000001 41 #define FAN_NONBLOCK 0x00000002 42 43 /* These are NOT bitwise flags. Both bits are used together. */ 44 #define FAN_CLASS_NOTIF 0x00000000 45 #define FAN_CLASS_CONTENT 0x00000004 46 #define FAN_CLASS_PRE_CONTENT 0x00000008 47 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 0x00000010 53 #define FAN_UNLIMITED_MARKS 0x00000020 54 #define FAN_ENABLE_AUDIT 0x00000040 55 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 #define FAN_REPORT_FD_ERROR 0x00002000 /* event->fd can report error */ 64 65 /* Convenience macro - FAN_REPORT_NAME requires FAN_REPORT_DIR_FID */ 66 #define FAN_REPORT_DFID_NAME (FAN_REPORT_DIR_FID | FAN_REPORT_NAME) 67 /* Convenience macro - FAN_REPORT_TARGET_FID requires all other FID flags */ 68 #define FAN_REPORT_DFID_NAME_TARGET (FAN_REPORT_DFID_NAME | \ 69 FAN_REPORT_FID | FAN_REPORT_TARGET_FID) 70 71 /* Deprecated - do not use this in programs and do not add new flags here! */ 72 #define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \ 73 FAN_ALL_CLASS_BITS | FAN_UNLIMITED_QUEUE |\ 74 FAN_UNLIMITED_MARKS) 75 76 /* flags used for fanotify_modify_mark() */ 77 #define FAN_MARK_ADD 0x00000001 78 #define FAN_MARK_REMOVE 0x00000002 79 #define FAN_MARK_DONT_FOLLOW 0x00000004 80 #define FAN_MARK_ONLYDIR 0x00000008 81 /* FAN_MARK_MOUNT is 0x00000010 */ 82 #define FAN_MARK_IGNORED_MASK 0x00000020 83 #define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040 84 #define FAN_MARK_FLUSH 0x00000080 85 /* FAN_MARK_FILESYSTEM is 0x00000100 */ 86 #define FAN_MARK_EVICTABLE 0x00000200 87 /* This bit is mutually exclusive with FAN_MARK_IGNORED_MASK bit */ 88 #define FAN_MARK_IGNORE 0x00000400 89 90 /* These are NOT bitwise flags. Both bits can be used togther. */ 91 #define FAN_MARK_INODE 0x00000000 92 #define FAN_MARK_MOUNT 0x00000010 93 #define FAN_MARK_FILESYSTEM 0x00000100 94 95 /* 96 * Convenience macro - FAN_MARK_IGNORE requires FAN_MARK_IGNORED_SURV_MODIFY 97 * for non-inode mark types. 98 */ 99 #define FAN_MARK_IGNORE_SURV (FAN_MARK_IGNORE | FAN_MARK_IGNORED_SURV_MODIFY) 100 101 /* Deprecated - do not use this in programs and do not add new flags here! */ 102 #define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\ 103 FAN_MARK_REMOVE |\ 104 FAN_MARK_DONT_FOLLOW |\ 105 FAN_MARK_ONLYDIR |\ 106 FAN_MARK_MOUNT |\ 107 FAN_MARK_IGNORED_MASK |\ 108 FAN_MARK_IGNORED_SURV_MODIFY |\ 109 FAN_MARK_FLUSH) 110 111 /* Deprecated - do not use this in programs and do not add new flags here! */ 112 #define FAN_ALL_EVENTS (FAN_ACCESS |\ 113 FAN_MODIFY |\ 114 FAN_CLOSE |\ 115 FAN_OPEN) 116 117 /* 118 * All events which require a permission response from userspace 119 */ 120 /* Deprecated - do not use this in programs and do not add new flags here! */ 121 #define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\ 122 FAN_ACCESS_PERM) 123 124 /* Deprecated - do not use this in programs and do not add new flags here! */ 125 #define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\ 126 FAN_ALL_PERM_EVENTS |\ 127 FAN_Q_OVERFLOW) 128 129 #define FANOTIFY_METADATA_VERSION 3 130 131 struct fanotify_event_metadata { 132 __u32 event_len; 133 __u8 vers; 134 __u8 reserved; 135 __u16 metadata_len; 136 __aligned_u64 mask; 137 __s32 fd; 138 __s32 pid; 139 }; 140 141 #define FAN_EVENT_INFO_TYPE_FID 1 142 #define FAN_EVENT_INFO_TYPE_DFID_NAME 2 143 #define FAN_EVENT_INFO_TYPE_DFID 3 144 #define FAN_EVENT_INFO_TYPE_PIDFD 4 145 #define FAN_EVENT_INFO_TYPE_ERROR 5 146 147 /* Special info types for FAN_RENAME */ 148 #define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME 10 149 /* Reserved for FAN_EVENT_INFO_TYPE_OLD_DFID 11 */ 150 #define FAN_EVENT_INFO_TYPE_NEW_DFID_NAME 12 151 /* Reserved for FAN_EVENT_INFO_TYPE_NEW_DFID 13 */ 152 153 /* Variable length info record following event metadata */ 154 struct fanotify_event_info_header { 155 __u8 info_type; 156 __u8 pad; 157 __u16 len; 158 }; 159 160 /* 161 * Unique file identifier info record. 162 * This structure is used for records of types FAN_EVENT_INFO_TYPE_FID, 163 * FAN_EVENT_INFO_TYPE_DFID and FAN_EVENT_INFO_TYPE_DFID_NAME. 164 * For FAN_EVENT_INFO_TYPE_DFID_NAME there is additionally a null terminated 165 * name immediately after the file handle. 166 */ 167 struct fanotify_event_info_fid { 168 struct fanotify_event_info_header hdr; 169 __kernel_fsid_t fsid; 170 /* 171 * Following is an opaque struct file_handle that can be passed as 172 * an argument to open_by_handle_at(2). 173 */ 174 unsigned char handle[]; 175 }; 176 177 /* 178 * This structure is used for info records of type FAN_EVENT_INFO_TYPE_PIDFD. 179 * It holds a pidfd for the pid that was responsible for generating an event. 180 */ 181 struct fanotify_event_info_pidfd { 182 struct fanotify_event_info_header hdr; 183 __s32 pidfd; 184 }; 185 186 struct fanotify_event_info_error { 187 struct fanotify_event_info_header hdr; 188 __s32 error; 189 __u32 error_count; 190 }; 191 192 /* 193 * User space may need to record additional information about its decision. 194 * The extra information type records what kind of information is included. 195 * The default is none. We also define an extra information buffer whose 196 * size is determined by the extra information type. 197 * 198 * If the information type is Audit Rule, then the information following 199 * is the rule number that triggered the user space decision that 200 * requires auditing. 201 */ 202 203 #define FAN_RESPONSE_INFO_NONE 0 204 #define FAN_RESPONSE_INFO_AUDIT_RULE 1 205 206 struct fanotify_response { 207 __s32 fd; 208 __u32 response; 209 }; 210 211 struct fanotify_response_info_header { 212 __u8 type; 213 __u8 pad; 214 __u16 len; 215 }; 216 217 struct fanotify_response_info_audit_rule { 218 struct fanotify_response_info_header hdr; 219 __u32 rule_number; 220 __u32 subj_trust; 221 __u32 obj_trust; 222 }; 223 224 /* Legit userspace responses to a _PERM event */ 225 #define FAN_ALLOW 0x01 226 #define FAN_DENY 0x02 227 #define FAN_AUDIT 0x10 /* Bitmask to create audit record for result */ 228 #define FAN_INFO 0x20 /* Bitmask to indicate additional information */ 229 230 /* No fd set in event */ 231 #define FAN_NOFD -1 232 #define FAN_NOPIDFD FAN_NOFD 233 #define FAN_EPIDFD -2 234 235 /* Helper functions to deal with fanotify_event_metadata buffers */ 236 #define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata)) 237 238 #define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \ 239 (struct fanotify_event_metadata*)(((char *)(meta)) + \ 240 (meta)->event_len)) 241 242 #define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \ 243 (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \ 244 (long)(meta)->event_len <= (long)(len)) 245 246 #endif /* _LINUX_FANOTIFY_H */