1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_PID_NS_H |
3 | #define _LINUX_PID_NS_H |
4 | |
5 | #include <linux/sched.h> |
6 | #include <linux/bug.h> |
7 | #include <linux/mm.h> |
8 | #include <linux/workqueue.h> |
9 | #include <linux/threads.h> |
10 | #include <linux/nsproxy.h> |
11 | #include <linux/ns_common.h> |
12 | #include <linux/idr.h> |
13 | |
14 | /* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */ |
15 | #define MAX_PID_NS_LEVEL 32 |
16 | |
17 | struct fs_pin; |
18 | |
19 | struct pid_namespace { |
20 | struct idr idr; |
21 | struct rcu_head rcu; |
22 | unsigned int pid_allocated; |
23 | struct task_struct *child_reaper; |
24 | struct kmem_cache *pid_cachep; |
25 | unsigned int level; |
26 | struct pid_namespace *parent; |
27 | #ifdef CONFIG_BSD_PROCESS_ACCT |
28 | struct fs_pin *bacct; |
29 | #endif |
30 | struct user_namespace *user_ns; |
31 | struct ucounts *ucounts; |
32 | int reboot; /* group exit code if this pidns was rebooted */ |
33 | struct ns_common ns; |
34 | } __randomize_layout; |
35 | |
36 | extern struct pid_namespace init_pid_ns; |
37 | |
38 | #define PIDNS_ADDING (1U << 31) |
39 | |
40 | #ifdef CONFIG_PID_NS |
41 | static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) |
42 | { |
43 | if (ns != &init_pid_ns) |
44 | refcount_inc(&ns->ns.count); |
45 | return ns; |
46 | } |
47 | |
48 | extern struct pid_namespace *copy_pid_ns(unsigned long flags, |
49 | struct user_namespace *user_ns, struct pid_namespace *ns); |
50 | extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); |
51 | extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); |
52 | extern void put_pid_ns(struct pid_namespace *ns); |
53 | |
54 | #else /* !CONFIG_PID_NS */ |
55 | #include <linux/err.h> |
56 | |
57 | static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) |
58 | { |
59 | return ns; |
60 | } |
61 | |
62 | static inline struct pid_namespace *copy_pid_ns(unsigned long flags, |
63 | struct user_namespace *user_ns, struct pid_namespace *ns) |
64 | { |
65 | if (flags & CLONE_NEWPID) |
66 | ns = ERR_PTR(-EINVAL); |
67 | return ns; |
68 | } |
69 | |
70 | static inline void put_pid_ns(struct pid_namespace *ns) |
71 | { |
72 | } |
73 | |
74 | static inline void zap_pid_ns_processes(struct pid_namespace *ns) |
75 | { |
76 | BUG(); |
77 | } |
78 | |
79 | static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) |
80 | { |
81 | return 0; |
82 | } |
83 | #endif /* CONFIG_PID_NS */ |
84 | |
85 | extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); |
86 | void pidhash_init(void); |
87 | void pid_idr_init(void); |
88 | |
89 | static inline bool task_is_in_init_pid_ns(struct task_struct *tsk) |
90 | { |
91 | return task_active_pid_ns(tsk) == &init_pid_ns; |
92 | } |
93 | |
94 | #endif /* _LINUX_PID_NS_H */ |
95 | |