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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> | |
769071ac AV |
7 | #include <linux/nsproxy.h> |
8 | #include <linux/ns_common.h> | |
9 | #include <linux/err.h> | |
10 | ||
11 | struct user_namespace; | |
12 | extern struct user_namespace init_user_ns; | |
13 | ||
af993f58 AV |
14 | struct timens_offsets { |
15 | struct timespec64 monotonic; | |
16 | struct timespec64 boottime; | |
17 | }; | |
18 | ||
769071ac | 19 | struct time_namespace { |
769071ac AV |
20 | struct user_namespace *user_ns; |
21 | struct ucounts *ucounts; | |
22 | struct ns_common ns; | |
af993f58 | 23 | struct timens_offsets offsets; |
afaa7b5a DS |
24 | struct page *vvar_page; |
25 | /* If set prevents changing offsets after any task joined namespace. */ | |
26 | bool frozen_offsets; | |
769071ac AV |
27 | } __randomize_layout; |
28 | ||
29 | extern struct time_namespace init_time_ns; | |
30 | ||
31 | #ifdef CONFIG_TIME_NS | |
70ddf651 DS |
32 | extern int vdso_join_timens(struct task_struct *task, |
33 | struct time_namespace *ns); | |
76c12881 | 34 | extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); |
70ddf651 | 35 | |
769071ac AV |
36 | static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
37 | { | |
28c41efd | 38 | refcount_inc(&ns->ns.count); |
769071ac AV |
39 | return ns; |
40 | } | |
41 | ||
42 | struct time_namespace *copy_time_ns(unsigned long flags, | |
43 | struct user_namespace *user_ns, | |
44 | struct time_namespace *old_ns); | |
28c41efd | 45 | void free_time_ns(struct time_namespace *ns); |
5c62634f | 46 | void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk); |
64b302ab | 47 | struct vdso_data *arch_get_vdso_data(void *vvar_page); |
769071ac AV |
48 | |
49 | static inline void put_time_ns(struct time_namespace *ns) | |
50 | { | |
28c41efd KT |
51 | if (refcount_dec_and_test(&ns->ns.count)) |
52 | free_time_ns(ns); | |
769071ac AV |
53 | } |
54 | ||
04a8682a AV |
55 | void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m); |
56 | ||
57 | struct proc_timens_offset { | |
58 | int clockid; | |
59 | struct timespec64 val; | |
60 | }; | |
61 | ||
62 | int proc_timens_set_offset(struct file *file, struct task_struct *p, | |
63 | struct proc_timens_offset *offsets, int n); | |
64 | ||
af993f58 AV |
65 | static inline void timens_add_monotonic(struct timespec64 *ts) |
66 | { | |
67 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
68 | ||
69 | *ts = timespec64_add(*ts, ns_offsets->monotonic); | |
70 | } | |
71 | ||
72 | static inline void timens_add_boottime(struct timespec64 *ts) | |
73 | { | |
74 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
75 | ||
76 | *ts = timespec64_add(*ts, ns_offsets->boottime); | |
77 | } | |
78 | ||
31909e33 MW |
79 | static inline u64 timens_add_boottime_ns(u64 nsec) |
80 | { | |
81 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
82 | ||
83 | return nsec + timespec64_to_ns(&ns_offsets->boottime); | |
84 | } | |
85 | ||
86 | static inline void timens_sub_boottime(struct timespec64 *ts) | |
87 | { | |
88 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
89 | ||
90 | *ts = timespec64_sub(*ts, ns_offsets->boottime); | |
91 | } | |
92 | ||
89dd8eec AV |
93 | ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim, |
94 | struct timens_offsets *offsets); | |
95 | ||
96 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) | |
97 | { | |
98 | struct time_namespace *ns = current->nsproxy->time_ns; | |
99 | ||
100 | if (likely(ns == &init_time_ns)) | |
101 | return tim; | |
102 | ||
103 | return do_timens_ktime_to_host(clockid, tim, &ns->offsets); | |
104 | } | |
105 | ||
769071ac | 106 | #else |
70ddf651 DS |
107 | static inline int vdso_join_timens(struct task_struct *task, |
108 | struct time_namespace *ns) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | ||
76c12881 CB |
113 | static inline void timens_commit(struct task_struct *tsk, |
114 | struct time_namespace *ns) | |
115 | { | |
116 | } | |
117 | ||
769071ac AV |
118 | static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | static inline void put_time_ns(struct time_namespace *ns) | |
124 | { | |
125 | } | |
126 | ||
127 | static inline | |
128 | struct time_namespace *copy_time_ns(unsigned long flags, | |
129 | struct user_namespace *user_ns, | |
130 | struct time_namespace *old_ns) | |
131 | { | |
132 | if (flags & CLONE_NEWTIME) | |
133 | return ERR_PTR(-EINVAL); | |
134 | ||
135 | return old_ns; | |
136 | } | |
137 | ||
5c62634f | 138 | static inline void timens_on_fork(struct nsproxy *nsproxy, |
769071ac AV |
139 | struct task_struct *tsk) |
140 | { | |
5c62634f | 141 | return; |
769071ac AV |
142 | } |
143 | ||
af993f58 AV |
144 | static inline void timens_add_monotonic(struct timespec64 *ts) { } |
145 | static inline void timens_add_boottime(struct timespec64 *ts) { } | |
31909e33 MW |
146 | |
147 | static inline u64 timens_add_boottime_ns(u64 nsec) | |
148 | { | |
149 | return nsec; | |
150 | } | |
151 | ||
152 | static inline void timens_sub_boottime(struct timespec64 *ts) { } | |
153 | ||
89dd8eec AV |
154 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
155 | { | |
156 | return tim; | |
157 | } | |
769071ac AV |
158 | #endif |
159 | ||
160 | #endif /* _LINUX_TIMENS_H */ |