| 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(&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(&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 */ |