[deliverable/linux.git] / include / net / net_namespace.h

/*
 * Operations on the network namespace
 */
#ifndef __NET_NET_NAMESPACE_H
#define __NET_NET_NAMESPACE_H

#include <asm/atomic.h>
#include <linux/workqueue.h>
#include <linux/list.h>

struct proc_dir_entry;
struct net_device;
struct net {
	atomic_t		count;		/* To decided when the network
						 *  namespace should be freed.
						 */
	atomic_t		use_count;	/* To track references we
						 * destroy on demand
						 */
	struct list_head	list;		/* list of network namespaces */
	struct work_struct	work;		/* work struct for freeing */

	struct proc_dir_entry 	*proc_net;
	struct proc_dir_entry 	*proc_net_stat;
	struct proc_dir_entry 	*proc_net_root;

	struct net_device       *loopback_dev;          /* The loopback */

	struct list_head 	dev_base_head;
	struct hlist_head 	*dev_name_head;
	struct hlist_head	*dev_index_head;
};

#ifdef CONFIG_NET
/* Init's network namespace */
extern struct net init_net;
#define INIT_NET_NS(net_ns) .net_ns = &init_net,
#else
#define INIT_NET_NS(net_ns)
#endif

extern struct list_head net_namespace_list;

#ifdef CONFIG_NET
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
#else
static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
{
	/* There is nothing to copy so this is a noop */
	return net_ns;
}
#endif

#ifdef CONFIG_NET_NS
extern void __put_net(struct net *net);

static inline struct net *get_net(struct net *net)
{
	atomic_inc(&net->count);
	return net;
}

static inline struct net *maybe_get_net(struct net *net)
{
	/* Used when we know struct net exists but we
	 * aren't guaranteed a previous reference count
	 * exists.  If the reference count is zero this
	 * function fails and returns NULL.
	 */
	if (!atomic_inc_not_zero(&net->count))
		net = NULL;
	return net;
}

static inline void put_net(struct net *net)
{
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
}

static inline struct net *hold_net(struct net *net)
{
	atomic_inc(&net->use_count);
	return net;
}

static inline void release_net(struct net *net)
{
	atomic_dec(&net->use_count);
}
#else
static inline struct net *get_net(struct net *net)
{
	return net;
}

static inline void put_net(struct net *net)
{
}

static inline struct net *hold_net(struct net *net)
{
	return net;
}

static inline void release_net(struct net *net)
{
}

static inline struct net *maybe_get_net(struct net *net)
{
	return net;
}
#endif

#define for_each_net(VAR)				\
	list_for_each_entry(VAR, &net_namespace_list, list)

#ifdef CONFIG_NET_NS
#define __net_init
#define __net_exit
#define __net_initdata
#else
#define __net_init	__init
#define __net_exit	__exit_refok
#define __net_initdata	__initdata
#endif

struct pernet_operations {
	struct list_head list;
	int (*init)(struct net *net);
	void (*exit)(struct net *net);
};

extern int register_pernet_subsys(struct pernet_operations *);
extern void unregister_pernet_subsys(struct pernet_operations *);
extern int register_pernet_device(struct pernet_operations *);
extern void unregister_pernet_device(struct pernet_operations *);

#endif /* __NET_NET_NAMESPACE_H */
Commit	Line	Data
5f256bec EB	1	/*
	2	* Operations on the network namespace
	3	*/
	4	#ifndef __NET_NET_NAMESPACE_H
	5	#define __NET_NET_NAMESPACE_H
	6
	7	#include <asm/atomic.h>
	8	#include <linux/workqueue.h>
	9	#include <linux/list.h>
	10
457c4cbc	11	struct proc_dir_entry;
2774c7ab	12	struct net_device;
5f256bec EB	13	struct net {
	14	atomic_t count; /* To decided when the network
	15	* namespace should be freed.
	16	*/
	17	atomic_t use_count; /* To track references we
	18	* destroy on demand
	19	*/
	20	struct list_head list; /* list of network namespaces */
	21	struct work_struct work; /* work struct for freeing */
457c4cbc EB	22
	23	struct proc_dir_entry *proc_net;
	24	struct proc_dir_entry *proc_net_stat;
	25	struct proc_dir_entry *proc_net_root;
881d966b	26
2774c7ab EB	27	struct net_device loopback_dev; / The loopback */
2774c7ab EB	28
881d966b EB	29	struct list_head dev_base_head;
	30	struct hlist_head *dev_name_head;
	31	struct hlist_head *dev_index_head;
5f256bec EB	32	};
5f256bec EB	33
4fabcd71 DL	34	#ifdef CONFIG_NET
4fabcd71 DL	35	/* Init's network namespace */
5f256bec	36	extern struct net init_net;
4fabcd71 DL	37	#define INIT_NET_NS(net_ns) .net_ns = &init_net,
	38	#else
	39	#define INIT_NET_NS(net_ns)
	40	#endif
	41
5f256bec EB	42	extern struct list_head net_namespace_list;
5f256bec EB	43
9dd776b6 EB	44	#ifdef CONFIG_NET
	45	extern struct net copy_net_ns(unsigned long flags, struct net net_ns);
	46	#else
	47	static inline struct net copy_net_ns(unsigned long flags, struct net net_ns)
	48	{
	49	/* There is nothing to copy so this is a noop */
	50	return net_ns;
	51	}
	52	#endif
	53
d4655795	54	#ifdef CONFIG_NET_NS
5f256bec EB	55	extern void __put_net(struct net *net);
	56
	57	static inline struct net get_net(struct net net)
	58	{
	59	atomic_inc(&net->count);
	60	return net;
	61	}
	62
077130c0 EB	63	static inline struct net maybe_get_net(struct net net)
	64	{
	65	/* Used when we know struct net exists but we
	66	* aren't guaranteed a previous reference count
	67	* exists. If the reference count is zero this
	68	* function fails and returns NULL.
	69	*/
	70	if (!atomic_inc_not_zero(&net->count))
	71	net = NULL;
	72	return net;
	73	}
	74
5f256bec EB	75	static inline void put_net(struct net *net)
	76	{
	77	if (atomic_dec_and_test(&net->count))
	78	__put_net(net);
	79	}
	80
	81	static inline struct net hold_net(struct net net)
	82	{
	83	atomic_inc(&net->use_count);
	84	return net;
	85	}
	86
	87	static inline void release_net(struct net *net)
	88	{
	89	atomic_dec(&net->use_count);
	90	}
d4655795 PE	91	#else
	92	static inline struct net get_net(struct net net)
	93	{
	94	return net;
	95	}
	96
	97	static inline void put_net(struct net *net)
	98	{
	99	}
	100
	101	static inline struct net hold_net(struct net net)
	102	{
	103	return net;
	104	}
	105
	106	static inline void release_net(struct net *net)
	107	{
	108	}
	109
	110	static inline struct net maybe_get_net(struct net net)
	111	{
	112	return net;
	113	}
	114	#endif
5f256bec	115
5f256bec EB	116	#define for_each_net(VAR) \
	117	list_for_each_entry(VAR, &net_namespace_list, list)
	118
4665079c PE	119	#ifdef CONFIG_NET_NS
	120	#define __net_init
	121	#define __net_exit
022cbae6	122	#define __net_initdata
4665079c PE	123	#else
	124	#define __net_init __init
	125	#define __net_exit __exit_refok
022cbae6	126	#define __net_initdata __initdata
4665079c	127	#endif
5f256bec EB	128
	129	struct pernet_operations {
	130	struct list_head list;
	131	int (init)(struct net net);
	132	void (exit)(struct net net);
	133	};
	134
	135	extern int register_pernet_subsys(struct pernet_operations *);
	136	extern void unregister_pernet_subsys(struct pernet_operations *);
	137	extern int register_pernet_device(struct pernet_operations *);
	138	extern void unregister_pernet_device(struct pernet_operations *);
	139
	140	#endif /* __NET_NET_NAMESPACE_H */