1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * procfs namespace bits
4  */
5 #ifndef _LINUX_PROC_NS_H
6 #define _LINUX_PROC_NS_H
7 
8 #include <linux/ns_common.h>
9 
10 struct pid_namespace;
11 struct nsset;
12 struct path;
13 struct task_struct;
14 struct inode;
15 
16 struct proc_ns_operations {
17 	const char *name;
18 	const char *real_ns_name;
19 	int type;
20 	struct ns_common *(*get)(struct task_struct *task);
21 	void (*put)(struct ns_common *ns);
22 	int (*install)(struct nsset *nsset, struct ns_common *ns);
23 	struct user_namespace *(*owner)(struct ns_common *ns);
24 	struct ns_common *(*get_parent)(struct ns_common *ns);
25 } __randomize_layout;
26 
27 extern const struct proc_ns_operations netns_operations;
28 extern const struct proc_ns_operations utsns_operations;
29 extern const struct proc_ns_operations ipcns_operations;
30 extern const struct proc_ns_operations pidns_operations;
31 extern const struct proc_ns_operations pidns_for_children_operations;
32 extern const struct proc_ns_operations userns_operations;
33 extern const struct proc_ns_operations mntns_operations;
34 extern const struct proc_ns_operations cgroupns_operations;
35 extern const struct proc_ns_operations timens_operations;
36 extern const struct proc_ns_operations timens_for_children_operations;
37 
38 /*
39  * We always define these enumerators
40  */
41 enum {
42 	PROC_ROOT_INO		= 1,
43 	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,
44 	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,
45 	PROC_USER_INIT_INO	= 0xEFFFFFFDU,
46 	PROC_PID_INIT_INO	= 0xEFFFFFFCU,
47 	PROC_CGROUP_INIT_INO	= 0xEFFFFFFBU,
48 	PROC_TIME_INIT_INO	= 0xEFFFFFFAU,
49 };
50 
51 #ifdef CONFIG_PROC_FS
52 
53 extern int proc_alloc_inum(unsigned int *pino);
54 extern void proc_free_inum(unsigned int inum);
55 
56 #else /* CONFIG_PROC_FS */
57 
proc_alloc_inum(unsigned int * inum)58 static inline int proc_alloc_inum(unsigned int *inum)
59 {
60 	*inum = 1;
61 	return 0;
62 }
proc_free_inum(unsigned int inum)63 static inline void proc_free_inum(unsigned int inum) {}
64 
65 #endif /* CONFIG_PROC_FS */
66 
ns_alloc_inum(struct ns_common * ns)67 static inline int ns_alloc_inum(struct ns_common *ns)
68 {
69 	atomic_long_set(&ns->stashed, 0);
70 	return proc_alloc_inum(&ns->inum);
71 }
72 
73 #define ns_free_inum(ns) proc_free_inum((ns)->inum)
74 
75 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
76 extern int ns_get_path(struct path *path, struct task_struct *task,
77 			const struct proc_ns_operations *ns_ops);
78 typedef struct ns_common *ns_get_path_helper_t(void *);
79 extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
80 			    void *private_data);
81 
82 extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
83 
84 extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
85 			const struct proc_ns_operations *ns_ops);
86 extern void nsfs_init(void);
87 
88 #endif /* _LINUX_PROC_NS_H */
89