1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2#ifndef __LINUX_NSFS_H
 3#define __LINUX_NSFS_H
 4
 5#include <linux/ioctl.h>
 6#include <linux/types.h>
 7
 8#define NSIO	0xb7
 9
10/* Returns a file descriptor that refers to an owning user namespace */
11#define NS_GET_USERNS		_IO(NSIO, 0x1)
12/* Returns a file descriptor that refers to a parent namespace */
13#define NS_GET_PARENT		_IO(NSIO, 0x2)
14/* Returns the type of namespace (CLONE_NEW* value) referred to by
15   file descriptor */
16#define NS_GET_NSTYPE		_IO(NSIO, 0x3)
17/* Get owner UID (in the caller's user namespace) for a user namespace */
18#define NS_GET_OWNER_UID	_IO(NSIO, 0x4)
19/* Get the id for a mount namespace */
20#define NS_GET_MNTNS_ID		_IOR(NSIO, 0x5, __u64)
21/* Translate pid from target pid namespace into the caller's pid namespace. */
22#define NS_GET_PID_FROM_PIDNS	_IOR(NSIO, 0x6, int)
23/* Return thread-group leader id of pid in the callers pid namespace. */
24#define NS_GET_TGID_FROM_PIDNS	_IOR(NSIO, 0x7, int)
25/* Translate pid from caller's pid namespace into a target pid namespace. */
26#define NS_GET_PID_IN_PIDNS	_IOR(NSIO, 0x8, int)
27/* Return thread-group leader id of pid in the target pid namespace. */
28#define NS_GET_TGID_IN_PIDNS	_IOR(NSIO, 0x9, int)
29
30struct mnt_ns_info {
31	__u32 size;
32	__u32 nr_mounts;
33	__u64 mnt_ns_id;
34};
35
36#define MNT_NS_INFO_SIZE_VER0 16 /* size of first published struct */
37
38/* Get information about namespace. */
39#define NS_MNT_GET_INFO		_IOR(NSIO, 10, struct mnt_ns_info)
40/* Get next namespace. */
41#define NS_MNT_GET_NEXT		_IOR(NSIO, 11, struct mnt_ns_info)
42/* Get previous namespace. */
43#define NS_MNT_GET_PREV		_IOR(NSIO, 12, struct mnt_ns_info)
44
45enum init_ns_ino {
46	IPC_NS_INIT_INO		= 0xEFFFFFFFU,
47	UTS_NS_INIT_INO		= 0xEFFFFFFEU,
48	USER_NS_INIT_INO	= 0xEFFFFFFDU,
49	PID_NS_INIT_INO		= 0xEFFFFFFCU,
50	CGROUP_NS_INIT_INO	= 0xEFFFFFFBU,
51	TIME_NS_INIT_INO	= 0xEFFFFFFAU,
52	NET_NS_INIT_INO		= 0xEFFFFFF9U,
53	MNT_NS_INIT_INO		= 0xEFFFFFF8U,
54};
55
56#endif /* __LINUX_NSFS_H */