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
58 static inline int proc_alloc_inum(unsigned int *inum)
59 {
60 *inum = 1;
61 return 0;
62 }
63 static inline void proc_free_inum(unsigned int inum) {}
64
65 #endif /* CONFIG_PROC_FS */
66
67 static inline int ns_alloc_inum(struct ns_common *ns)
68 {
69 WRITE_ONCE(ns->stashed, NULL);
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
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