[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 sock;
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;

	struct sock 		*rtnl;			/* rtnetlink socket */

	/* List of all packet sockets. */
	rwlock_t		packet_sklist_lock;
	struct hlist_head	packet_sklist;
};

#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;
97c53cac	13	struct sock;
5f256bec EB	14	struct net {
	15	atomic_t count; /* To decided when the network
	16	* namespace should be freed.
	17	*/
	18	atomic_t use_count; /* To track references we
	19	* destroy on demand
	20	*/
	21	struct list_head list; /* list of network namespaces */
	22	struct work_struct work; /* work struct for freeing */
457c4cbc EB	23
	24	struct proc_dir_entry *proc_net;
	25	struct proc_dir_entry *proc_net_stat;
	26	struct proc_dir_entry *proc_net_root;
881d966b	27
2774c7ab EB	28	struct net_device loopback_dev; / The loopback */
2774c7ab EB	29
881d966b EB	30	struct list_head dev_base_head;
	31	struct hlist_head *dev_name_head;
	32	struct hlist_head *dev_index_head;
97c53cac DL	33
97c53cac DL	34	struct sock rtnl; / rtnetlink socket */
d12d01d6 DL	35
	36	/* List of all packet sockets. */
	37	rwlock_t packet_sklist_lock;
	38	struct hlist_head packet_sklist;
5f256bec EB	39	};
5f256bec EB	40
4fabcd71 DL	41	#ifdef CONFIG_NET
4fabcd71 DL	42	/* Init's network namespace */
5f256bec	43	extern struct net init_net;
4fabcd71 DL	44	#define INIT_NET_NS(net_ns) .net_ns = &init_net,
	45	#else
	46	#define INIT_NET_NS(net_ns)
	47	#endif
	48
5f256bec EB	49	extern struct list_head net_namespace_list;
5f256bec EB	50
9dd776b6 EB	51	#ifdef CONFIG_NET
	52	extern struct net copy_net_ns(unsigned long flags, struct net net_ns);
	53	#else
	54	static inline struct net copy_net_ns(unsigned long flags, struct net net_ns)
	55	{
	56	/* There is nothing to copy so this is a noop */
	57	return net_ns;
	58	}
	59	#endif
	60
d4655795	61	#ifdef CONFIG_NET_NS
5f256bec EB	62	extern void __put_net(struct net *net);
	63
	64	static inline struct net get_net(struct net net)
	65	{
	66	atomic_inc(&net->count);
	67	return net;
	68	}
	69
077130c0 EB	70	static inline struct net maybe_get_net(struct net net)
	71	{
	72	/* Used when we know struct net exists but we
	73	* aren't guaranteed a previous reference count
	74	* exists. If the reference count is zero this
	75	* function fails and returns NULL.
	76	*/
	77	if (!atomic_inc_not_zero(&net->count))
	78	net = NULL;
	79	return net;
	80	}
	81
5f256bec EB	82	static inline void put_net(struct net *net)
	83	{
	84	if (atomic_dec_and_test(&net->count))
	85	__put_net(net);
	86	}
	87
	88	static inline struct net hold_net(struct net net)
	89	{
	90	atomic_inc(&net->use_count);
	91	return net;
	92	}
	93
	94	static inline void release_net(struct net *net)
	95	{
	96	atomic_dec(&net->use_count);
	97	}
d4655795 PE	98	#else
	99	static inline struct net get_net(struct net net)
	100	{
	101	return net;
	102	}
	103
	104	static inline void put_net(struct net *net)
	105	{
	106	}
	107
	108	static inline struct net hold_net(struct net net)
	109	{
	110	return net;
	111	}
	112
	113	static inline void release_net(struct net *net)
	114	{
	115	}
	116
	117	static inline struct net maybe_get_net(struct net net)
	118	{
	119	return net;
	120	}
	121	#endif
5f256bec	122
5f256bec EB	123	#define for_each_net(VAR) \
	124	list_for_each_entry(VAR, &net_namespace_list, list)
	125
4665079c PE	126	#ifdef CONFIG_NET_NS
	127	#define __net_init
	128	#define __net_exit
022cbae6	129	#define __net_initdata
4665079c PE	130	#else
	131	#define __net_init __init
	132	#define __net_exit __exit_refok
022cbae6	133	#define __net_initdata __initdata
4665079c	134	#endif
5f256bec EB	135
	136	struct pernet_operations {
	137	struct list_head list;
	138	int (init)(struct net net);
	139	void (exit)(struct net net);
	140	};
	141
	142	extern int register_pernet_subsys(struct pernet_operations *);
	143	extern void unregister_pernet_subsys(struct pernet_operations *);
	144	extern int register_pernet_device(struct pernet_operations *);
	145	extern void unregister_pernet_device(struct pernet_operations *);
	146
	147	#endif /* __NET_NET_NAMESPACE_H */