[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>

struct pidmap {
       atomic_t nr_free;
       void *page;
};

#define BITS_PER_PAGE		(PAGE_SIZE * 8)
#define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)
#define PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)

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 pidmap pidmap[PIDMAP_ENTRIES];
	struct rcu_head rcu;
	int last_pid;
	unsigned int nr_hashed;
	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_HASH_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 pidmap_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>
aa5a6662 SB	13
	14	struct pidmap {
	15	atomic_t nr_free;
	16	void *page;
	17	};
	18
5cc54451 RC	19	#define BITS_PER_PAGE (PAGE_SIZE * 8)
	20	#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
	21	#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
aa5a6662	22
59eda0e0	23	struct fs_pin;
20fad13a	24
796f571b LW	25	enum { /* definitions for pid_namespace's hide_pid field */
	26	HIDEPID_OFF = 0,
	27	HIDEPID_NO_ACCESS = 1,
	28	HIDEPID_INVISIBLE = 2,
	29	};
	30
61a58c6c	31	struct pid_namespace {
9a575a92 CLG	32	struct kref kref;
9a575a92 CLG	33	struct pidmap pidmap[PIDMAP_ENTRIES];
1adfcb03	34	struct rcu_head rcu;
9a575a92	35	int last_pid;
c876ad76	36	unsigned int nr_hashed;
84d73786	37	struct task_struct *child_reaper;
baf8f0f8	38	struct kmem_cache *pid_cachep;
caafa432	39	unsigned int level;
faacbfd3	40	struct pid_namespace *parent;
07543f5c PE	41	#ifdef CONFIG_PROC_FS
07543f5c PE	42	struct vfsmount *proc_mnt;
021ada7d	43	struct dentry *proc_self;
0097875b	44	struct dentry *proc_thread_self;
07543f5c	45	#endif
20fad13a	46	#ifdef CONFIG_BSD_PROCESS_ACCT
59eda0e0	47	struct fs_pin *bacct;
20fad13a	48	#endif
49f4d8b9	49	struct user_namespace *user_ns;
f333c700	50	struct ucounts *ucounts;
0a01f2cc	51	struct work_struct proc_work;
dcb0f222	52	kgid_t pid_gid;
0499680a	53	int hide_pid;
cf3f8921	54	int reboot; /* group exit code if this pidns was rebooted */
435d5f4b	55	struct ns_common ns;
3859a271	56	} __randomize_layout;
3fbc9648	57
61a58c6c	58	extern struct pid_namespace init_pid_ns;
3fbc9648	59
c876ad76 EB	60	#define PIDNS_HASH_ADDING (1U << 31)
c876ad76 EB	61
57d5f66b	62	#ifdef CONFIG_PID_NS
a05f7b15	63	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
9a575a92	64	{
b461cc03 PE	65	if (ns != &init_pid_ns)
b461cc03 PE	66	kref_get(&ns->kref);
a05f7b15	67	return ns;
9a575a92 CLG	68	}
9a575a92 CLG	69
49f4d8b9 EB	70	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	71	struct user_namespace user_ns, struct pid_namespace ns);
74bd59bb	72	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
cf3f8921	73	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
bbc2e3ef	74	extern void put_pid_ns(struct pid_namespace *ns);
9a575a92	75
57d5f66b EB	76	#else /* !CONFIG_PID_NS */
	77	#include <linux/err.h>
	78
	79	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	80	{
	81	return ns;
	82	}
	83
49f4d8b9 EB	84	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	85	struct user_namespace user_ns, struct pid_namespace ns)
57d5f66b EB	86	{
	87	if (flags & CLONE_NEWPID)
	88	ns = ERR_PTR(-EINVAL);
	89	return ns;
	90	}
	91
	92	static inline void put_pid_ns(struct pid_namespace *ns)
	93	{
	94	}
	95
74bd59bb PE	96	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	97	{
	98	BUG();
	99	}
cf3f8921 DL	100
	101	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	102	{
	103	return 0;
	104	}
57d5f66b EB	105	#endif /* CONFIG_PID_NS */
57d5f66b EB	106
61bce0f1	107	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
3ae4eed3 AB	108	void pidhash_init(void);
	109	void pidmap_init(void);
	110
61a58c6c	111	#endif /* _LINUX_PID_NS_H */