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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ *
+ * This file is created to resolve conflicts between user space and kernel
+ * space fctnl.h declaration. linux/watch_queue.h is not handled, since
+ * user space fcntl.h redefines kernel space structures.
+ */
+
+#ifndef LAPI_WATCH_QUEUE_H__
+#define LAPI_WATCH_QUEUE_H__
+
+#include <stdint.h>
+#include "lapi/ioctl.h"
+#include "lapi/fcntl.h"
+
+#define O_NOTIFICATION_PIPE O_EXCL /* Parameter to pipe2() selecting notification pipe */
+
+#define IOC_WATCH_QUEUE_SET_SIZE _IO('W', 0x60) /* Set the size in pages */
+#define IOC_WATCH_QUEUE_SET_FILTER _IO('W', 0x61) /* Set the filter */
+
+enum watch_notification_type {
+ WATCH_TYPE_META = 0, /* Special record */
+ WATCH_TYPE_KEY_NOTIFY = 1, /* Key change event notification */
+ WATCH_TYPE__NR = 2
+};
+
+enum watch_meta_notification_subtype {
+ WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */
+ WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */
+};
+
+/*
+ * Notification record header. This is aligned to 64-bits so that subclasses
+ * can contain __u64 fields.
+ */
+struct watch_notification {
+ uint32_t type:24; /* enum watch_notification_type */
+ uint32_t subtype:8; /* Type-specific subtype (filterable) */
+ uint32_t info;
+#define WATCH_INFO_LENGTH 0x0000007f /* Length of record */
+#define WATCH_INFO_LENGTH__SHIFT 0
+#define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */
+#define WATCH_INFO_ID__SHIFT 8
+#define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */
+#define WATCH_INFO_TYPE_INFO__SHIFT 16
+#define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */
+#define WATCH_INFO_FLAG_1 0x00020000 /* ... */
+#define WATCH_INFO_FLAG_2 0x00040000
+#define WATCH_INFO_FLAG_3 0x00080000
+#define WATCH_INFO_FLAG_4 0x00100000
+#define WATCH_INFO_FLAG_5 0x00200000
+#define WATCH_INFO_FLAG_6 0x00400000
+#define WATCH_INFO_FLAG_7 0x00800000
+};
+
+/*
+ * Notification filtering rules (IOC_WATCH_QUEUE_SET_FILTER).
+ */
+struct watch_notification_type_filter {
+ uint32_t type; /* Type to apply filter to */
+ uint32_t info_filter; /* Filter on watch_notification::info */
+ uint32_t info_mask; /* Mask of relevant bits in info_filter */
+ uint32_t subtype_filter[8]; /* Bitmask of subtypes to filter on */
+};
+
+struct watch_notification_filter {
+ uint32_t nr_filters; /* Number of filters */
+ uint32_t __reserved; /* Must be 0 */
+ struct watch_notification_type_filter filters[];
+};
+
+
+/*
+ * Extended watch removal notification. This is used optionally if the type
+ * wants to indicate an identifier for the object being watched, if there is
+ * such. This can be distinguished by the length.
+ *
+ * type -> WATCH_TYPE_META
+ * subtype -> WATCH_META_REMOVAL_NOTIFICATION
+ */
+struct watch_notification_removal {
+ struct watch_notification watch;
+ uint64_t id; /* Type-dependent identifier */
+};
+
+/*
+ * Type of key/keyring change notification.
+ */
+enum key_notification_subtype {
+ NOTIFY_KEY_INSTANTIATED = 0, /* Key was instantiated (aux is error code) */
+ NOTIFY_KEY_UPDATED = 1, /* Key was updated */
+ NOTIFY_KEY_LINKED = 2, /* Key (aux) was added to watched keyring */
+ NOTIFY_KEY_UNLINKED = 3, /* Key (aux) was removed from watched keyring */
+ NOTIFY_KEY_CLEARED = 4, /* Keyring was cleared */
+ NOTIFY_KEY_REVOKED = 5, /* Key was revoked */
+ NOTIFY_KEY_INVALIDATED = 6, /* Key was invalidated */
+ NOTIFY_KEY_SETATTR = 7, /* Key's attributes got changed */
+};
+
+/*
+ * Key/keyring notification record.
+ * - watch.type = WATCH_TYPE_KEY_NOTIFY
+ * - watch.subtype = enum key_notification_type
+ */
+struct key_notification {
+ struct watch_notification watch;
+ uint32_t key_id; /* The key/keyring affected */
+ uint32_t aux; /* Per-type auxiliary data */
+};
+
+#endif /* LAPI_WATCH_QUEUE_H__ */
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.de> --- include/lapi/watch_queue.h | 112 +++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 include/lapi/watch_queue.h