uts_namespace.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _LINUX_UTS_NAMESPACE_H
 3#define _LINUX_UTS_NAMESPACE_H
 4
 5#include <linux/ns_common.h>
 6#include <uapi/linux/utsname.h>
 7
 8struct user_namespace;
 9extern struct user_namespace init_user_ns;
10
11struct uts_namespace {
12	struct new_utsname name;
13	struct user_namespace *user_ns;
14	struct ucounts *ucounts;
15	struct ns_common ns;
16} __randomize_layout;
17
18extern struct uts_namespace init_uts_ns;
19
20#ifdef CONFIG_UTS_NS
21static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
22{
23	return container_of(ns, struct uts_namespace, ns);
24}
25
26static inline void get_uts_ns(struct uts_namespace *ns)
27{
28	ns_ref_inc(ns);
29}
30
31extern struct uts_namespace *copy_utsname(u64 flags,
32	struct user_namespace *user_ns, struct uts_namespace *old_ns);
33extern void free_uts_ns(struct uts_namespace *ns);
34
35static inline void put_uts_ns(struct uts_namespace *ns)
36{
37	if (ns_ref_put(ns))
38		free_uts_ns(ns);
39}
40
41void uts_ns_init(void);
42#else
43static inline void get_uts_ns(struct uts_namespace *ns)
44{
45}
46
47static inline void put_uts_ns(struct uts_namespace *ns)
48{
49}
50
51static inline struct uts_namespace *copy_utsname(u64 flags,
52	struct user_namespace *user_ns, struct uts_namespace *old_ns)
53{
54	if (flags & CLONE_NEWUTS)
55		return ERR_PTR(-EINVAL);
56
57	return old_ns;
58}
59
60static inline void uts_ns_init(void)
61{
62}
63#endif
64
65#endif /* _LINUX_UTS_NAMESPACE_H */