LXR linux/include/linux/utsname.h

   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/kref.h>
   8#include <linux/nsproxy.h>
   9#include <linux/ns_common.h>
  10#include <linux/err.h>
  11#include <uapi/linux/utsname.h>
  12
  13enum uts_proc {
  14        UTS_PROC_OSTYPE,
  15        UTS_PROC_OSRELEASE,
  16        UTS_PROC_VERSION,
  17        UTS_PROC_HOSTNAME,
  18        UTS_PROC_DOMAINNAME,
  19};
  20
  21struct user_namespace;
  22extern struct user_namespace init_user_ns;
  23
  24struct uts_namespace {
  25        struct kref kref;
  26        struct new_utsname name;
  27        struct user_namespace *user_ns;
  28        struct ucounts *ucounts;
  29        struct ns_common ns;
  30} __randomize_layout;
  31extern struct uts_namespace init_uts_ns;
  32
  33#ifdef CONFIG_UTS_NS
  34static inline void get_uts_ns(struct uts_namespace *ns)
  35{
  36        kref_get(&ns->kref);
  37}
  38
  39extern struct uts_namespace *copy_utsname(unsigned long flags,
  40        struct user_namespace *user_ns, struct uts_namespace *old_ns);
  41extern void free_uts_ns(struct kref *kref);
  42
  43static inline void put_uts_ns(struct uts_namespace *ns)
  44{
  45        kref_put(&ns->kref, free_uts_ns);
  46}
  47
  48void uts_ns_init(void);
  49#else
  50static inline void get_uts_ns(struct uts_namespace *ns)
  51{
  52}
  53
  54static inline void put_uts_ns(struct uts_namespace *ns)
  55{
  56}
  57
  58static 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
  67static inline void uts_ns_init(void)
  68{
  69}
  70#endif
  71
  72#ifdef CONFIG_PROC_SYSCTL
  73extern void uts_proc_notify(enum uts_proc proc);
  74#else
  75static inline void uts_proc_notify(enum uts_proc proc)
  76{
  77}
  78#endif
  79
  80static inline struct new_utsname *utsname(void)
  81{
  82        return &current->nsproxy->uts_ns->name;
  83}
  84
  85static inline struct new_utsname *init_utsname(void)
  86{
  87        return &init_uts_ns.name;
  88}
  89
  90extern struct rw_semaphore uts_sem;
  91
  92#endif /* _LINUX_UTSNAME_H */
  93