1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _LINUX_UTSNAME_H
3*4882a593Smuzhiyun #define _LINUX_UTSNAME_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/sched.h>
7*4882a593Smuzhiyun #include <linux/kref.h>
8*4882a593Smuzhiyun #include <linux/nsproxy.h>
9*4882a593Smuzhiyun #include <linux/ns_common.h>
10*4882a593Smuzhiyun #include <linux/err.h>
11*4882a593Smuzhiyun #include <uapi/linux/utsname.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun enum uts_proc {
14*4882a593Smuzhiyun UTS_PROC_OSTYPE,
15*4882a593Smuzhiyun UTS_PROC_OSRELEASE,
16*4882a593Smuzhiyun UTS_PROC_VERSION,
17*4882a593Smuzhiyun UTS_PROC_HOSTNAME,
18*4882a593Smuzhiyun UTS_PROC_DOMAINNAME,
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct user_namespace;
22*4882a593Smuzhiyun extern struct user_namespace init_user_ns;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun struct uts_namespace {
25*4882a593Smuzhiyun struct kref kref;
26*4882a593Smuzhiyun struct new_utsname name;
27*4882a593Smuzhiyun struct user_namespace *user_ns;
28*4882a593Smuzhiyun struct ucounts *ucounts;
29*4882a593Smuzhiyun struct ns_common ns;
30*4882a593Smuzhiyun } __randomize_layout;
31*4882a593Smuzhiyun extern struct uts_namespace init_uts_ns;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #ifdef CONFIG_UTS_NS
get_uts_ns(struct uts_namespace * ns)34*4882a593Smuzhiyun static inline void get_uts_ns(struct uts_namespace *ns)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun kref_get(&ns->kref);
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun extern struct uts_namespace *copy_utsname(unsigned long flags,
40*4882a593Smuzhiyun struct user_namespace *user_ns, struct uts_namespace *old_ns);
41*4882a593Smuzhiyun extern void free_uts_ns(struct kref *kref);
42*4882a593Smuzhiyun
put_uts_ns(struct uts_namespace * ns)43*4882a593Smuzhiyun static inline void put_uts_ns(struct uts_namespace *ns)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun kref_put(&ns->kref, free_uts_ns);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun void uts_ns_init(void);
49*4882a593Smuzhiyun #else
get_uts_ns(struct uts_namespace * ns)50*4882a593Smuzhiyun static inline void get_uts_ns(struct uts_namespace *ns)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
put_uts_ns(struct uts_namespace * ns)54*4882a593Smuzhiyun static inline void put_uts_ns(struct uts_namespace *ns)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
copy_utsname(unsigned long flags,struct user_namespace * user_ns,struct uts_namespace * old_ns)58*4882a593Smuzhiyun static inline struct uts_namespace *copy_utsname(unsigned long flags,
59*4882a593Smuzhiyun struct user_namespace *user_ns, struct uts_namespace *old_ns)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun if (flags & CLONE_NEWUTS)
62*4882a593Smuzhiyun return ERR_PTR(-EINVAL);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun return old_ns;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
uts_ns_init(void)67*4882a593Smuzhiyun static inline void uts_ns_init(void)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun #endif
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun #ifdef CONFIG_PROC_SYSCTL
73*4882a593Smuzhiyun extern void uts_proc_notify(enum uts_proc proc);
74*4882a593Smuzhiyun #else
uts_proc_notify(enum uts_proc proc)75*4882a593Smuzhiyun static inline void uts_proc_notify(enum uts_proc proc)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun #endif
79*4882a593Smuzhiyun
utsname(void)80*4882a593Smuzhiyun static inline struct new_utsname *utsname(void)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun return ¤t->nsproxy->uts_ns->name;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
init_utsname(void)85*4882a593Smuzhiyun static inline struct new_utsname *init_utsname(void)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun return &init_uts_ns.name;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun extern struct rw_semaphore uts_sem;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun #endif /* _LINUX_UTSNAME_H */
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