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_ARCH, |
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 new_utsname name; |
26 | struct user_namespace *user_ns; |
27 | struct ucounts *ucounts; |
28 | struct ns_common ns; |
29 | } __randomize_layout; |
30 | extern struct uts_namespace init_uts_ns; |
31 | |
32 | #ifdef CONFIG_UTS_NS |
33 | static inline void get_uts_ns(struct uts_namespace *ns) |
34 | { |
35 | refcount_inc(r: &ns->ns.count); |
36 | } |
37 | |
38 | extern struct uts_namespace *copy_utsname(unsigned long flags, |
39 | struct user_namespace *user_ns, struct uts_namespace *old_ns); |
40 | extern void free_uts_ns(struct uts_namespace *ns); |
41 | |
42 | static inline void put_uts_ns(struct uts_namespace *ns) |
43 | { |
44 | if (refcount_dec_and_test(r: &ns->ns.count)) |
45 | free_uts_ns(ns); |
46 | } |
47 | |
48 | void uts_ns_init(void); |
49 | #else |
50 | static inline void get_uts_ns(struct uts_namespace *ns) |
51 | { |
52 | } |
53 | |
54 | static inline void put_uts_ns(struct uts_namespace *ns) |
55 | { |
56 | } |
57 | |
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 | |
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 |
75 | static inline void uts_proc_notify(enum uts_proc proc) |
76 | { |
77 | } |
78 | #endif |
79 | |
80 | static inline struct new_utsname *utsname(void) |
81 | { |
82 | return ¤t->nsproxy->uts_ns->name; |
83 | } |
84 | |
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 | |