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