[linux-2.6-block.git] / include / linux / proc_ns.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * procfs namespace bits
 */
#ifndef _LINUX_PROC_NS_H
#define _LINUX_PROC_NS_H

#include <linux/ns_common.h>

struct pid_namespace;
struct nsset;
struct path;
struct task_struct;
struct inode;

struct proc_ns_operations {
	const char *name;
	const char *real_ns_name;
	int type;
	struct ns_common *(*get)(struct task_struct *task);
	void (*put)(struct ns_common *ns);
	int (*install)(struct nsset *nsset, struct ns_common *ns);
	struct user_namespace *(*owner)(struct ns_common *ns);
	struct ns_common *(*get_parent)(struct ns_common *ns);
} __randomize_layout;

extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
extern const struct proc_ns_operations pidns_for_children_operations;
extern const struct proc_ns_operations userns_operations;
extern const struct proc_ns_operations mntns_operations;
extern const struct proc_ns_operations cgroupns_operations;
extern const struct proc_ns_operations timens_operations;
extern const struct proc_ns_operations timens_for_children_operations;

/*
 * We always define these enumerators
 */
enum {
	PROC_ROOT_INO		= 1,
	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,
	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,
	PROC_USER_INIT_INO	= 0xEFFFFFFDU,
	PROC_PID_INIT_INO	= 0xEFFFFFFCU,
	PROC_CGROUP_INIT_INO	= 0xEFFFFFFBU,
	PROC_TIME_INIT_INO	= 0xEFFFFFFAU,
};

#ifdef CONFIG_PROC_FS

extern int proc_alloc_inum(unsigned int *pino);
extern void proc_free_inum(unsigned int inum);

#else /* CONFIG_PROC_FS */

static inline int proc_alloc_inum(unsigned int *inum)
{
	*inum = 1;
	return 0;
}
static inline void proc_free_inum(unsigned int inum) {}

#endif /* CONFIG_PROC_FS */

static inline int ns_alloc_inum(struct ns_common *ns)
{
	atomic_long_set(&ns->stashed, 0);
	return proc_alloc_inum(&ns->inum);
}

#define ns_free_inum(ns) proc_free_inum((ns)->inum)

#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
extern int ns_get_path(struct path *path, struct task_struct *task,
			const struct proc_ns_operations *ns_ops);
typedef struct ns_common *ns_get_path_helper_t(void *);
extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
			    void *private_data);

extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);

extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
			const struct proc_ns_operations *ns_ops);
extern void nsfs_init(void);

#endif /* _LINUX_PROC_NS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
0bb80f24 DH	2	/*
	3	* procfs namespace bits
	4	*/
	5	#ifndef _LINUX_PROC_NS_H
	6	#define _LINUX_PROC_NS_H
	7
e149ed2b AV	8	#include <linux/ns_common.h>
e149ed2b AV	9
0bb80f24	10	struct pid_namespace;
f2a8d52e	11	struct nsset;
e149ed2b	12	struct path;
a79a908f AK	13	struct task_struct;
a79a908f AK	14	struct inode;
0bb80f24 DH	15
	16	struct proc_ns_operations {
	17	const char *name;
25b14e92	18	const char *real_ns_name;
0bb80f24	19	int type;
64964528 AV	20	struct ns_common (get)(struct task_struct *task);
64964528 AV	21	void (put)(struct ns_common ns);
f2a8d52e	22	int (install)(struct nsset nsset, struct ns_common *ns);
bcac25a5	23	struct user_namespace (owner)(struct ns_common *ns);
a7306ed8	24	struct ns_common (get_parent)(struct ns_common *ns);
3859a271	25	} __randomize_layout;
0bb80f24	26
0bb80f24 DH	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;
eaa0d190	31	extern const struct proc_ns_operations pidns_for_children_operations;
0bb80f24 DH	32	extern const struct proc_ns_operations userns_operations;
0bb80f24 DH	33	extern const struct proc_ns_operations mntns_operations;
a79a908f	34	extern const struct proc_ns_operations cgroupns_operations;
769071ac AV	35	extern const struct proc_ns_operations timens_operations;
769071ac AV	36	extern const struct proc_ns_operations timens_for_children_operations;
0bb80f24 DH	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,
a79a908f	47	PROC_CGROUP_INIT_INO = 0xEFFFFFFBU,
769071ac	48	PROC_TIME_INIT_INO = 0xEFFFFFFAU,
0bb80f24 DH	49	};
	50
	51	#ifdef CONFIG_PROC_FS
	52
0bb80f24 DH	53	extern int proc_alloc_inum(unsigned int *pino);
0bb80f24 DH	54	extern void proc_free_inum(unsigned int inum);
0bb80f24 DH	55
	56	#else /* CONFIG_PROC_FS */
	57
0bb80f24 DH	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) {}
0bb80f24 DH	64
	65	#endif /* CONFIG_PROC_FS */
	66
e149ed2b AV	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
6344c433 AV	73	#define ns_free_inum(ns) proc_free_inum((ns)->inum)
6344c433 AV	74
e149ed2b	75	#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
ce623f89	76	extern int ns_get_path(struct path path, struct task_struct task,
e149ed2b	77	const struct proc_ns_operations *ns_ops);
cdab6ba8	78	typedef struct ns_common ns_get_path_helper_t(void );
ce623f89	79	extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
cdab6ba8	80	void *private_data);
e149ed2b	81
1e2328e7 CN	82	extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
1e2328e7 CN	83
e149ed2b AV	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
0bb80f24	88	#endif /* _LINUX_PROC_NS_H */