1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_FANOTIFY_H 3 #define _LINUX_FANOTIFY_H 4 5 #include <linux/sysctl.h> 6 #include <uapi/linux/fanotify.h> 7 8 extern struct ctl_table fanotify_table[]; /* for sysctl */ 9 10 #define FAN_GROUP_FLAG(group, flag) \ 11 ((group)->fanotify_data.flags & (flag)) 12 13 /* 14 * Flags allowed to be passed from/to userspace. 15 * 16 * We intentionally do not add new bits to the old FAN_ALL_* constants, because 17 * they are uapi exposed constants. If there are programs out there using 18 * these constant, the programs may break if re-compiled with new uapi headers 19 * and then run on an old kernel. 20 */ 21 22 /* Group classes where permission events are allowed */ 23 #define FANOTIFY_PERM_CLASSES (FAN_CLASS_CONTENT | \ 24 FAN_CLASS_PRE_CONTENT) 25 26 #define FANOTIFY_CLASS_BITS (FAN_CLASS_NOTIF | FANOTIFY_PERM_CLASSES) 27 28 #define FANOTIFY_FID_BITS (FAN_REPORT_FID | FAN_REPORT_DFID_NAME) 29 30 #define FANOTIFY_INFO_MODES (FANOTIFY_FID_BITS | FAN_REPORT_PIDFD) 31 32 /* 33 * fanotify_init() flags that require CAP_SYS_ADMIN. 34 * We do not allow unprivileged groups to request permission events. 35 * We do not allow unprivileged groups to get other process pid in events. 36 * We do not allow unprivileged groups to use unlimited resources. 37 */ 38 #define FANOTIFY_ADMIN_INIT_FLAGS (FANOTIFY_PERM_CLASSES | \ 39 FAN_REPORT_TID | \ 40 FAN_REPORT_PIDFD | \ 41 FAN_UNLIMITED_QUEUE | \ 42 FAN_UNLIMITED_MARKS) 43 44 /* 45 * fanotify_init() flags that are allowed for user without CAP_SYS_ADMIN. 46 * FAN_CLASS_NOTIF is the only class we allow for unprivileged group. 47 * We do not allow unprivileged groups to get file descriptors in events, 48 * so one of the flags for reporting file handles is required. 49 */ 50 #define FANOTIFY_USER_INIT_FLAGS (FAN_CLASS_NOTIF | \ 51 FANOTIFY_FID_BITS | \ 52 FAN_CLOEXEC | FAN_NONBLOCK) 53 54 #define FANOTIFY_INIT_FLAGS (FANOTIFY_ADMIN_INIT_FLAGS | \ 55 FANOTIFY_USER_INIT_FLAGS) 56 57 /* Internal group flags */ 58 #define FANOTIFY_UNPRIV 0x80000000 59 #define FANOTIFY_INTERNAL_GROUP_FLAGS (FANOTIFY_UNPRIV) 60 61 #define FANOTIFY_MARK_TYPE_BITS (FAN_MARK_INODE | FAN_MARK_MOUNT | \ 62 FAN_MARK_FILESYSTEM) 63 64 #define FANOTIFY_MARK_FLAGS (FANOTIFY_MARK_TYPE_BITS | \ 65 FAN_MARK_ADD | \ 66 FAN_MARK_REMOVE | \ 67 FAN_MARK_DONT_FOLLOW | \ 68 FAN_MARK_ONLYDIR | \ 69 FAN_MARK_IGNORED_MASK | \ 70 FAN_MARK_IGNORED_SURV_MODIFY | \ 71 FAN_MARK_FLUSH) 72 73 /* 74 * Events that can be reported with data type FSNOTIFY_EVENT_PATH. 75 * Note that FAN_MODIFY can also be reported with data type 76 * FSNOTIFY_EVENT_INODE. 77 */ 78 #define FANOTIFY_PATH_EVENTS (FAN_ACCESS | FAN_MODIFY | \ 79 FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC) 80 81 /* 82 * Directory entry modification events - reported only to directory 83 * where entry is modified and not to a watching parent. 84 */ 85 #define FANOTIFY_DIRENT_EVENTS (FAN_MOVE | FAN_CREATE | FAN_DELETE) 86 87 /* Events that can only be reported with data type FSNOTIFY_EVENT_INODE */ 88 #define FANOTIFY_INODE_EVENTS (FANOTIFY_DIRENT_EVENTS | \ 89 FAN_ATTRIB | FAN_MOVE_SELF | FAN_DELETE_SELF) 90 91 /* Events that user can request to be notified on */ 92 #define FANOTIFY_EVENTS (FANOTIFY_PATH_EVENTS | \ 93 FANOTIFY_INODE_EVENTS) 94 95 /* Events that require a permission response from user */ 96 #define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \ 97 FAN_OPEN_EXEC_PERM) 98 99 /* Extra flags that may be reported with event or control handling of events */ 100 #define FANOTIFY_EVENT_FLAGS (FAN_EVENT_ON_CHILD | FAN_ONDIR) 101 102 /* Events that may be reported to user */ 103 #define FANOTIFY_OUTGOING_EVENTS (FANOTIFY_EVENTS | \ 104 FANOTIFY_PERM_EVENTS | \ 105 FAN_Q_OVERFLOW | FAN_ONDIR) 106 107 #define ALL_FANOTIFY_EVENT_BITS (FANOTIFY_OUTGOING_EVENTS | \ 108 FANOTIFY_EVENT_FLAGS) 109 110 /* Do not use these old uapi constants internally */ 111 #undef FAN_ALL_CLASS_BITS 112 #undef FAN_ALL_INIT_FLAGS 113 #undef FAN_ALL_MARK_FLAGS 114 #undef FAN_ALL_EVENTS 115 #undef FAN_ALL_PERM_EVENTS 116 #undef FAN_ALL_OUTGOING_EVENTS 117 118 #endif /* _LINUX_FANOTIFY_H */ 119