| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame] | 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 | |
| 15 | struct timens_offsets { |
| 16 | struct timespec64 monotonic; |
| 17 | struct timespec64 boottime; |
| 18 | }; |
| 19 | |
| 20 | struct time_namespace { |
| 21 | struct kref kref; |
| 22 | struct user_namespace *user_ns; |
| 23 | struct ucounts *ucounts; |
| 24 | struct ns_common ns; |
| 25 | struct timens_offsets offsets; |
| 26 | struct page *vvar_page; |
| 27 | /* If set prevents changing offsets after any task joined namespace. */ |
| 28 | bool frozen_offsets; |
| 29 | } __randomize_layout; |
| 30 | |
| 31 | extern struct time_namespace init_time_ns; |
| 32 | |
| 33 | #ifdef CONFIG_TIME_NS |
| 34 | extern int vdso_join_timens(struct task_struct *task, |
| 35 | struct time_namespace *ns); |
| 36 | extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); |
| 37 | |
| 38 | static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
| 39 | { |
| 40 | kref_get(&ns->kref); |
| 41 | return ns; |
| 42 | } |
| 43 | |
| 44 | struct time_namespace *copy_time_ns(unsigned long flags, |
| 45 | struct user_namespace *user_ns, |
| 46 | struct time_namespace *old_ns); |
| 47 | void free_time_ns(struct kref *kref); |
| 48 | int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk); |
| 49 | struct vdso_data *arch_get_vdso_data(void *vvar_page); |
| 50 | |
| 51 | static inline void put_time_ns(struct time_namespace *ns) |
| 52 | { |
| 53 | kref_put(&ns->kref, free_time_ns); |
| 54 | } |
| 55 | |
| 56 | void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m); |
| 57 | |
| 58 | struct proc_timens_offset { |
| 59 | int clockid; |
| 60 | struct timespec64 val; |
| 61 | }; |
| 62 | |
| 63 | int proc_timens_set_offset(struct file *file, struct task_struct *p, |
| 64 | struct proc_timens_offset *offsets, int n); |
| 65 | |
| 66 | static inline void timens_add_monotonic(struct timespec64 *ts) |
| 67 | { |
| 68 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
| 69 | |
| 70 | *ts = timespec64_add(*ts, ns_offsets->monotonic); |
| 71 | } |
| 72 | |
| 73 | static inline void timens_add_boottime(struct timespec64 *ts) |
| 74 | { |
| 75 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
| 76 | |
| 77 | *ts = timespec64_add(*ts, ns_offsets->boottime); |
| 78 | } |
| 79 | |
| 80 | ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim, |
| 81 | struct timens_offsets *offsets); |
| 82 | |
| 83 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
| 84 | { |
| 85 | struct time_namespace *ns = current->nsproxy->time_ns; |
| 86 | |
| 87 | if (likely(ns == &init_time_ns)) |
| 88 | return tim; |
| 89 | |
| 90 | return do_timens_ktime_to_host(clockid, tim, &ns->offsets); |
| 91 | } |
| 92 | |
| 93 | #else |
| 94 | static inline int vdso_join_timens(struct task_struct *task, |
| 95 | struct time_namespace *ns) |
| 96 | { |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static inline void timens_commit(struct task_struct *tsk, |
| 101 | struct time_namespace *ns) |
| 102 | { |
| 103 | } |
| 104 | |
| 105 | static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
| 106 | { |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | static inline void put_time_ns(struct time_namespace *ns) |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | static inline |
| 115 | struct time_namespace *copy_time_ns(unsigned long flags, |
| 116 | struct user_namespace *user_ns, |
| 117 | struct time_namespace *old_ns) |
| 118 | { |
| 119 | if (flags & CLONE_NEWTIME) |
| 120 | return ERR_PTR(-EINVAL); |
| 121 | |
| 122 | return old_ns; |
| 123 | } |
| 124 | |
| 125 | static inline int timens_on_fork(struct nsproxy *nsproxy, |
| 126 | struct task_struct *tsk) |
| 127 | { |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static inline void timens_add_monotonic(struct timespec64 *ts) { } |
| 132 | static inline void timens_add_boottime(struct timespec64 *ts) { } |
| 133 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
| 134 | { |
| 135 | return tim; |
| 136 | } |
| 137 | #endif |
| 138 | |
| 139 | #endif /* _LINUX_TIMENS_H */ |