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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H

#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/workqueue.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>
#include <linux/ns_common.h>
#include <linux/idr.h>

/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
#define MAX_PID_NS_LEVEL 32

struct fs_pin;

enum { /* definitions for pid_namespace's hide_pid field */
	HIDEPID_OFF	  = 0,
	HIDEPID_NO_ACCESS = 1,
	HIDEPID_INVISIBLE = 2,
};

struct pid_namespace {
	struct kref kref;
	struct idr idr;
	struct rcu_head rcu;
	unsigned int pid_allocated;
	struct task_struct *child_reaper;
	struct kmem_cache *pid_cachep;
	unsigned int level;
	struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
	struct vfsmount *proc_mnt;
	struct dentry *proc_self;
	struct dentry *proc_thread_self;
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct fs_pin *bacct;
#endif
	struct user_namespace *user_ns;
	struct ucounts *ucounts;
	struct work_struct proc_work;
	kgid_t pid_gid;
	int hide_pid;
	int reboot;	/* group exit code if this pidns was rebooted */
	struct ns_common ns;
} __randomize_layout;

extern struct pid_namespace init_pid_ns;

#define PIDNS_ADDING (1U << 31)

#ifdef CONFIG_PID_NS
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	if (ns != &init_pid_ns)
		kref_get(&ns->kref);
	return ns;
}

extern struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
extern void put_pid_ns(struct pid_namespace *ns);

#else /* !CONFIG_PID_NS */
#include <linux/err.h>

static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	return ns;
}

static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns)
{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

static inline void put_pid_ns(struct pid_namespace *ns)
{
}

static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
	BUG();
}

static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
	return 0;
}
#endif /* CONFIG_PID_NS */

extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
void pid_idr_init(void);

#endif /* _LINUX_PID_NS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
61a58c6c SB	2	#ifndef _LINUX_PID_NS_H
61a58c6c SB	3	#define _LINUX_PID_NS_H
aa5a6662 SB	4
aa5a6662 SB	5	#include <linux/sched.h>
187f1882	6	#include <linux/bug.h>
aa5a6662	7	#include <linux/mm.h>
a27bb332	8	#include <linux/workqueue.h>
aa5a6662	9	#include <linux/threads.h>
9a575a92 CLG	10	#include <linux/nsproxy.h>
9a575a92 CLG	11	#include <linux/kref.h>
435d5f4b	12	#include <linux/ns_common.h>
95846ecf	13	#include <linux/idr.h>
aa5a6662	14
49cb2fc4 AR	15	/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
49cb2fc4 AR	16	#define MAX_PID_NS_LEVEL 32
aa5a6662	17
59eda0e0	18	struct fs_pin;
20fad13a	19
796f571b LW	20	enum { /* definitions for pid_namespace's hide_pid field */
	21	HIDEPID_OFF = 0,
	22	HIDEPID_NO_ACCESS = 1,
	23	HIDEPID_INVISIBLE = 2,
	24	};
	25
61a58c6c	26	struct pid_namespace {
9a575a92	27	struct kref kref;
95846ecf	28	struct idr idr;
1adfcb03	29	struct rcu_head rcu;
e8cfbc24	30	unsigned int pid_allocated;
84d73786	31	struct task_struct *child_reaper;
baf8f0f8	32	struct kmem_cache *pid_cachep;
caafa432	33	unsigned int level;
faacbfd3	34	struct pid_namespace *parent;
07543f5c PE	35	#ifdef CONFIG_PROC_FS
07543f5c PE	36	struct vfsmount *proc_mnt;
021ada7d	37	struct dentry *proc_self;
0097875b	38	struct dentry *proc_thread_self;
07543f5c	39	#endif
20fad13a	40	#ifdef CONFIG_BSD_PROCESS_ACCT
59eda0e0	41	struct fs_pin *bacct;
20fad13a	42	#endif
49f4d8b9	43	struct user_namespace *user_ns;
f333c700	44	struct ucounts *ucounts;
0a01f2cc	45	struct work_struct proc_work;
dcb0f222	46	kgid_t pid_gid;
0499680a	47	int hide_pid;
cf3f8921	48	int reboot; /* group exit code if this pidns was rebooted */
435d5f4b	49	struct ns_common ns;
3859a271	50	} __randomize_layout;
3fbc9648	51
61a58c6c	52	extern struct pid_namespace init_pid_ns;
3fbc9648	53
e8cfbc24	54	#define PIDNS_ADDING (1U << 31)
c876ad76	55
57d5f66b	56	#ifdef CONFIG_PID_NS
a05f7b15	57	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
9a575a92	58	{
b461cc03 PE	59	if (ns != &init_pid_ns)
b461cc03 PE	60	kref_get(&ns->kref);
a05f7b15	61	return ns;
9a575a92 CLG	62	}
9a575a92 CLG	63
49f4d8b9 EB	64	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	65	struct user_namespace user_ns, struct pid_namespace ns);
74bd59bb	66	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
cf3f8921	67	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
bbc2e3ef	68	extern void put_pid_ns(struct pid_namespace *ns);
9a575a92	69
57d5f66b EB	70	#else /* !CONFIG_PID_NS */
	71	#include <linux/err.h>
	72
	73	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	74	{
	75	return ns;
	76	}
	77
49f4d8b9 EB	78	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	79	struct user_namespace user_ns, struct pid_namespace ns)
57d5f66b EB	80	{
	81	if (flags & CLONE_NEWPID)
	82	ns = ERR_PTR(-EINVAL);
	83	return ns;
	84	}
	85
	86	static inline void put_pid_ns(struct pid_namespace *ns)
	87	{
	88	}
	89
74bd59bb PE	90	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	91	{
	92	BUG();
	93	}
cf3f8921 DL	94
	95	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	96	{
	97	return 0;
	98	}
57d5f66b EB	99	#endif /* CONFIG_PID_NS */
57d5f66b EB	100
61bce0f1	101	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
3ae4eed3	102	void pidhash_init(void);
95846ecf	103	void pid_idr_init(void);
3ae4eed3	104
61a58c6c	105	#endif /* _LINUX_PID_NS_H */