| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_UTSNAME_H |
| #define _LINUX_UTSNAME_H |
| |
| |
| #include <linux/sched.h> |
| #include <linux/nsproxy.h> |
| #include <linux/ns_common.h> |
| #include <linux/err.h> |
| #include <uapi/linux/utsname.h> |
| |
| enum uts_proc { |
| UTS_PROC_OSTYPE, |
| UTS_PROC_OSRELEASE, |
| UTS_PROC_VERSION, |
| UTS_PROC_HOSTNAME, |
| UTS_PROC_DOMAINNAME, |
| }; |
| |
| struct user_namespace; |
| extern struct user_namespace init_user_ns; |
| |
| struct uts_namespace { |
| struct new_utsname name; |
| struct user_namespace *user_ns; |
| struct ucounts *ucounts; |
| struct ns_common ns; |
| } __randomize_layout; |
| extern struct uts_namespace init_uts_ns; |
| |
| #ifdef CONFIG_UTS_NS |
| static inline void get_uts_ns(struct uts_namespace *ns) |
| { |
| refcount_inc(&ns->ns.count); |
| } |
| |
| extern struct uts_namespace *copy_utsname(unsigned long flags, |
| struct user_namespace *user_ns, struct uts_namespace *old_ns); |
| extern void free_uts_ns(struct uts_namespace *ns); |
| |
| static inline void put_uts_ns(struct uts_namespace *ns) |
| { |
| if (refcount_dec_and_test(&ns->ns.count)) |
| free_uts_ns(ns); |
| } |
| |
| void uts_ns_init(void); |
| #else |
| static inline void get_uts_ns(struct uts_namespace *ns) |
| { |
| } |
| |
| static inline void put_uts_ns(struct uts_namespace *ns) |
| { |
| } |
| |
| static inline struct uts_namespace *copy_utsname(unsigned long flags, |
| struct user_namespace *user_ns, struct uts_namespace *old_ns) |
| { |
| if (flags & CLONE_NEWUTS) |
| return ERR_PTR(-EINVAL); |
| |
| return old_ns; |
| } |
| |
| static inline void uts_ns_init(void) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| extern void uts_proc_notify(enum uts_proc proc); |
| #else |
| static inline void uts_proc_notify(enum uts_proc proc) |
| { |
| } |
| #endif |
| |
| static inline struct new_utsname *utsname(void) |
| { |
| return ¤t->nsproxy->uts_ns->name; |
| } |
| |
| static inline struct new_utsname *init_utsname(void) |
| { |
| return &init_uts_ns.name; |
| } |
| |
| extern struct rw_semaphore uts_sem; |
| |
| #endif /* _LINUX_UTSNAME_H */ |