1 #ifndef _LINUX_UTSNAME_H 2 #define _LINUX_UTSNAME_H 3 4 5 #include <linux/sched.h> 6 #include <linux/kref.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_OSTYPE, 14 UTS_PROC_OSRELEASE, 15 UTS_PROC_VERSION, 16 UTS_PROC_HOSTNAME, 17 UTS_PROC_DOMAINNAME, 18 }; 19 20 struct user_namespace; 21 extern struct user_namespace init_user_ns; 22 23 struct uts_namespace { 24 struct kref kref; 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 kref_get(&ns->kref); 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 kref *kref); 41 42 static inline void put_uts_ns(struct uts_namespace *ns) 43 { 44 kref_put(&ns->kref, free_uts_ns); 45 } 46 #else 47 static inline void get_uts_ns(struct uts_namespace *ns) 48 { 49 } 50 51 static inline void put_uts_ns(struct uts_namespace *ns) 52 { 53 } 54 55 static inline struct uts_namespace *copy_utsname(unsigned long flags, 56 struct user_namespace *user_ns, struct uts_namespace *old_ns) 57 { 58 if (flags & CLONE_NEWUTS) 59 return ERR_PTR(-EINVAL); 60 61 return old_ns; 62 } 63 #endif 64 65 #ifdef CONFIG_PROC_SYSCTL 66 extern void uts_proc_notify(enum uts_proc proc); 67 #else 68 static inline void uts_proc_notify(enum uts_proc proc) 69 { 70 } 71 #endif 72 73 static inline struct new_utsname *utsname(void) 74 { 75 return ¤t->nsproxy->uts_ns->name; 76 } 77 78 static inline struct new_utsname *init_utsname(void) 79 { 80 return &init_uts_ns.name; 81 } 82 83 extern struct rw_semaphore uts_sem; 84 85 #endif /* _LINUX_UTSNAME_H */ 86