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
13 enum uts_proc {
14 UTS_PROC_OSTYPE,
15 UTS_PROC_OSRELEASE,
16 UTS_PROC_VERSION,
17 UTS_PROC_HOSTNAME,
18 UTS_PROC_DOMAINNAME,
19 };
20
21 struct user_namespace;
22 extern struct user_namespace init_user_ns;
23
24 struct 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;
31 extern struct uts_namespace init_uts_ns;
32
33 #ifdef CONFIG_UTS_NS
get_uts_ns(struct uts_namespace * ns)34 static inline void get_uts_ns(struct uts_namespace *ns)
35 {
36 kref_get(&ns->kref);
37 }
38
39 extern struct uts_namespace *copy_utsname(unsigned long flags,
40 struct user_namespace *user_ns, struct uts_namespace *old_ns);
41 extern void free_uts_ns(struct kref *kref);
42
put_uts_ns(struct uts_namespace * ns)43 static inline void put_uts_ns(struct uts_namespace *ns)
44 {
45 kref_put(&ns->kref, free_uts_ns);
46 }
47
48 void uts_ns_init(void);
49 #else
get_uts_ns(struct uts_namespace * ns)50 static inline void get_uts_ns(struct uts_namespace *ns)
51 {
52 }
53
put_uts_ns(struct uts_namespace * ns)54 static inline void put_uts_ns(struct uts_namespace *ns)
55 {
56 }
57
copy_utsname(unsigned long flags,struct user_namespace * user_ns,struct uts_namespace * old_ns)58 static 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
uts_ns_init(void)67 static inline void uts_ns_init(void)
68 {
69 }
70 #endif
71
72 #ifdef CONFIG_PROC_SYSCTL
73 extern void uts_proc_notify(enum uts_proc proc);
74 #else
uts_proc_notify(enum uts_proc proc)75 static inline void uts_proc_notify(enum uts_proc proc)
76 {
77 }
78 #endif
79
utsname(void)80 static inline struct new_utsname *utsname(void)
81 {
82 return ¤t->nsproxy->uts_ns->name;
83 }
84
init_utsname(void)85 static inline struct new_utsname *init_utsname(void)
86 {
87 return &init_uts_ns.name;
88 }
89
90 extern struct rw_semaphore uts_sem;
91
92 #endif /* _LINUX_UTSNAME_H */
93