1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_UTSNAME_H
3#define _LINUX_UTSNAME_H
4
5
6#include <linux/sched.h>
7#include <linux/kref.h>
8#include <linux/nsproxy.h>
9#include <linux/ns_common.h>
10#include <linux/err.h>
11#include <uapi/linux/utsname.h>
12
13enum uts_proc {
14 UTS_PROC_OSTYPE,
15 UTS_PROC_OSRELEASE,
16 UTS_PROC_VERSION,
17 UTS_PROC_HOSTNAME,
18 UTS_PROC_DOMAINNAME,
19};
20
21struct user_namespace;
22extern struct user_namespace init_user_ns;
23
24struct uts_namespace {
25 struct kref kref;
26 struct new_utsname name;
27 struct user_namespace *user_ns;
28 struct ucounts *ucounts;
29 struct ns_common ns;
30} __randomize_layout;
31extern struct uts_namespace init_uts_ns;
32
33#ifdef CONFIG_UTS_NS
34static inline void get_uts_ns(struct uts_namespace *ns)
35{
36 kref_get(&ns->kref);
37}
38
39extern struct uts_namespace *copy_utsname(unsigned long flags,
40 struct user_namespace *user_ns, struct uts_namespace *old_ns);
41extern void free_uts_ns(struct kref *kref);
42
43static inline void put_uts_ns(struct uts_namespace *ns)
44{
45 kref_put(&ns->kref, free_uts_ns);
46}
47
48void uts_ns_init(void);
49#else
50static inline void get_uts_ns(struct uts_namespace *ns)
51{
52}
53
54static inline void put_uts_ns(struct uts_namespace *ns)
55{
56}
57
58static inline struct uts_namespace *copy_utsname(unsigned long flags,
59 struct user_namespace *user_ns, struct uts_namespace *old_ns)
60{
61 if (flags & CLONE_NEWUTS)
62 return ERR_PTR(-EINVAL);
63
64 return old_ns;
65}
66
67static inline void uts_ns_init(void)
68{
69}
70#endif
71
72#ifdef CONFIG_PROC_SYSCTL
73extern void uts_proc_notify(enum uts_proc proc);
74#else
75static inline void uts_proc_notify(enum uts_proc proc)
76{
77}
78#endif
79
80static inline struct new_utsname *utsname(void)
81{
82 return &current->nsproxy->uts_ns->name;
83}
84
85static inline struct new_utsname *init_utsname(void)
86{
87 return &init_uts_ns.name;
88}
89
90extern struct rw_semaphore uts_sem;
91
92#endif /* _LINUX_UTSNAME_H */
93