[mirror_ubuntu-jammy-kernel.git] / include / linux / time_namespace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TIMENS_H
#define _LINUX_TIMENS_H


#include <linux/sched.h>
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/err.h>

struct user_namespace;
extern struct user_namespace init_user_ns;

struct timens_offsets {
	struct timespec64 monotonic;
	struct timespec64 boottime;
};

struct time_namespace {
	struct kref		kref;
	struct user_namespace	*user_ns;
	struct ucounts		*ucounts;
	struct ns_common	ns;
	struct timens_offsets	offsets;
} __randomize_layout;

extern struct time_namespace init_time_ns;

#ifdef CONFIG_TIME_NS
static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
	kref_get(&ns->kref);
	return ns;
}

struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns);
void free_time_ns(struct kref *kref);
int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);

static inline void put_time_ns(struct time_namespace *ns)
{
	kref_put(&ns->kref, free_time_ns);
}

static inline void timens_add_monotonic(struct timespec64 *ts)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	*ts = timespec64_add(*ts, ns_offsets->monotonic);
}

static inline void timens_add_boottime(struct timespec64 *ts)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	*ts = timespec64_add(*ts, ns_offsets->boottime);
}

ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
				struct timens_offsets *offsets);

static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{
	struct time_namespace *ns = current->nsproxy->time_ns;

	if (likely(ns == &init_time_ns))
		return tim;

	return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
}

#else
static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
	return NULL;
}

static inline void put_time_ns(struct time_namespace *ns)
{
}

static inline
struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns)
{
	if (flags & CLONE_NEWTIME)
		return ERR_PTR(-EINVAL);

	return old_ns;
}

static inline int timens_on_fork(struct nsproxy *nsproxy,
				 struct task_struct *tsk)
{
	return 0;
}

static inline void timens_add_monotonic(struct timespec64 *ts) { }
static inline void timens_add_boottime(struct timespec64 *ts) { }
static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{
	return tim;
}
#endif

#endif /* _LINUX_TIMENS_H */
Commit	Line	Data
769071ac AV	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_TIMENS_H
	3	#define _LINUX_TIMENS_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
	12	struct user_namespace;
	13	extern struct user_namespace init_user_ns;
	14
af993f58 AV	15	struct timens_offsets {
	16	struct timespec64 monotonic;
	17	struct timespec64 boottime;
	18	};
	19
769071ac AV	20	struct time_namespace {
	21	struct kref kref;
	22	struct user_namespace *user_ns;
	23	struct ucounts *ucounts;
	24	struct ns_common ns;
af993f58	25	struct timens_offsets offsets;
769071ac AV	26	} __randomize_layout;
	27
	28	extern struct time_namespace init_time_ns;
	29
	30	#ifdef CONFIG_TIME_NS
	31	static inline struct time_namespace get_time_ns(struct time_namespace ns)
	32	{
	33	kref_get(&ns->kref);
	34	return ns;
	35	}
	36
	37	struct time_namespace *copy_time_ns(unsigned long flags,
	38	struct user_namespace *user_ns,
	39	struct time_namespace *old_ns);
	40	void free_time_ns(struct kref *kref);
	41	int timens_on_fork(struct nsproxy nsproxy, struct task_struct tsk);
	42
	43	static inline void put_time_ns(struct time_namespace *ns)
	44	{
	45	kref_put(&ns->kref, free_time_ns);
	46	}
	47
af993f58 AV	48	static inline void timens_add_monotonic(struct timespec64 *ts)
	49	{
	50	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	51
	52	ts = timespec64_add(ts, ns_offsets->monotonic);
	53	}
	54
	55	static inline void timens_add_boottime(struct timespec64 *ts)
	56	{
	57	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	58
	59	ts = timespec64_add(ts, ns_offsets->boottime);
	60	}
	61
89dd8eec AV	62	ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
	63	struct timens_offsets *offsets);
	64
	65	static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
	66	{
	67	struct time_namespace *ns = current->nsproxy->time_ns;
	68
	69	if (likely(ns == &init_time_ns))
	70	return tim;
	71
	72	return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
	73	}
	74
769071ac AV	75	#else
	76	static inline struct time_namespace get_time_ns(struct time_namespace ns)
	77	{
	78	return NULL;
	79	}
	80
	81	static inline void put_time_ns(struct time_namespace *ns)
	82	{
	83	}
	84
	85	static inline
	86	struct time_namespace *copy_time_ns(unsigned long flags,
	87	struct user_namespace *user_ns,
	88	struct time_namespace *old_ns)
	89	{
	90	if (flags & CLONE_NEWTIME)
	91	return ERR_PTR(-EINVAL);
	92
	93	return old_ns;
	94	}
	95
	96	static inline int timens_on_fork(struct nsproxy *nsproxy,
	97	struct task_struct *tsk)
	98	{
	99	return 0;
	100	}
	101
af993f58 AV	102	static inline void timens_add_monotonic(struct timespec64 *ts) { }
af993f58 AV	103	static inline void timens_add_boottime(struct timespec64 *ts) { }
89dd8eec AV	104	static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
	105	{
	106	return tim;
	107	}
769071ac AV	108	#endif
	109
	110	#endif /* _LINUX_TIMENS_H */