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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); |
d6c494e8 | 48 | struct page *find_timens_vvar_page(struct vm_area_struct *vma); |
769071ac AV |
49 | |
50 | static inline void put_time_ns(struct time_namespace *ns) | |
51 | { | |
28c41efd KT |
52 | if (refcount_dec_and_test(&ns->ns.count)) |
53 | free_time_ns(ns); | |
769071ac AV |
54 | } |
55 | ||
04a8682a AV |
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 | ||
af993f58 AV |
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 | ||
31909e33 MW |
80 | static inline u64 timens_add_boottime_ns(u64 nsec) |
81 | { | |
82 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
83 | ||
84 | return nsec + timespec64_to_ns(&ns_offsets->boottime); | |
85 | } | |
86 | ||
87 | static inline void timens_sub_boottime(struct timespec64 *ts) | |
88 | { | |
89 | struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; | |
90 | ||
91 | *ts = timespec64_sub(*ts, ns_offsets->boottime); | |
92 | } | |
93 | ||
89dd8eec AV |
94 | ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim, |
95 | struct timens_offsets *offsets); | |
96 | ||
97 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) | |
98 | { | |
99 | struct time_namespace *ns = current->nsproxy->time_ns; | |
100 | ||
101 | if (likely(ns == &init_time_ns)) | |
102 | return tim; | |
103 | ||
104 | return do_timens_ktime_to_host(clockid, tim, &ns->offsets); | |
105 | } | |
106 | ||
769071ac | 107 | #else |
70ddf651 DS |
108 | static inline int vdso_join_timens(struct task_struct *task, |
109 | struct time_namespace *ns) | |
110 | { | |
111 | return 0; | |
112 | } | |
113 | ||
76c12881 CB |
114 | static inline void timens_commit(struct task_struct *tsk, |
115 | struct time_namespace *ns) | |
116 | { | |
117 | } | |
118 | ||
769071ac AV |
119 | static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
120 | { | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | static inline void put_time_ns(struct time_namespace *ns) | |
125 | { | |
126 | } | |
127 | ||
128 | static inline | |
129 | struct time_namespace *copy_time_ns(unsigned long flags, | |
130 | struct user_namespace *user_ns, | |
131 | struct time_namespace *old_ns) | |
132 | { | |
133 | if (flags & CLONE_NEWTIME) | |
134 | return ERR_PTR(-EINVAL); | |
135 | ||
136 | return old_ns; | |
137 | } | |
138 | ||
5c62634f | 139 | static inline void timens_on_fork(struct nsproxy *nsproxy, |
769071ac AV |
140 | struct task_struct *tsk) |
141 | { | |
5c62634f | 142 | return; |
769071ac AV |
143 | } |
144 | ||
d6c494e8 JH |
145 | static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma) |
146 | { | |
147 | return NULL; | |
148 | } | |
149 | ||
af993f58 AV |
150 | static inline void timens_add_monotonic(struct timespec64 *ts) { } |
151 | static inline void timens_add_boottime(struct timespec64 *ts) { } | |
31909e33 MW |
152 | |
153 | static inline u64 timens_add_boottime_ns(u64 nsec) | |
154 | { | |
155 | return nsec; | |
156 | } | |
157 | ||
158 | static inline void timens_sub_boottime(struct timespec64 *ts) { } | |
159 | ||
89dd8eec AV |
160 | static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
161 | { | |
162 | return tim; | |
163 | } | |
769071ac AV |
164 | #endif |
165 | ||
166 | #endif /* _LINUX_TIMENS_H */ |