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/* 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_ARCH,
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 */
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