[GitHub/mt8127/android_kernel_alcatel_ttab.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 {
	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 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

extern void __put_net(struct net *net);

static inline struct net *get_net(struct net *net)
{
#ifdef CONFIG_NET
	atomic_inc(&net->count);
#endif
	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)
{
#ifdef CONFIG_NET
	if (atomic_dec_and_test(&net->count))
		__put_net(net);
#endif
}

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

static inline void release_net(struct net *net)
{
#ifdef CONFIG_NET
	atomic_dec(&net->use_count);
#endif
}

extern void net_lock(void);
extern void net_unlock(void);

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


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;
5f256bec EB	12	struct net {
	13	atomic_t count; /* To decided when the network
	14	* namespace should be freed.
	15	*/
	16	atomic_t use_count; /* To track references we
	17	* destroy on demand
	18	*/
	19	struct list_head list; /* list of network namespaces */
	20	struct work_struct work; /* work struct for freeing */
457c4cbc EB	21
	22	struct proc_dir_entry *proc_net;
	23	struct proc_dir_entry *proc_net_stat;
	24	struct proc_dir_entry *proc_net_root;
881d966b EB	25
	26	struct list_head dev_base_head;
	27	struct hlist_head *dev_name_head;
	28	struct hlist_head *dev_index_head;
5f256bec EB	29	};
5f256bec EB	30
4fabcd71 DL	31	#ifdef CONFIG_NET
4fabcd71 DL	32	/* Init's network namespace */
5f256bec	33	extern struct net init_net;
4fabcd71 DL	34	#define INIT_NET_NS(net_ns) .net_ns = &init_net,
	35	#else
	36	#define INIT_NET_NS(net_ns)
	37	#endif
	38
5f256bec EB	39	extern struct list_head net_namespace_list;
5f256bec EB	40
9dd776b6 EB	41	#ifdef CONFIG_NET
	42	extern struct net copy_net_ns(unsigned long flags, struct net net_ns);
	43	#else
	44	static inline struct net copy_net_ns(unsigned long flags, struct net net_ns)
	45	{
	46	/* There is nothing to copy so this is a noop */
	47	return net_ns;
	48	}
	49	#endif
	50
5f256bec EB	51	extern void __put_net(struct net *net);
	52
	53	static inline struct net get_net(struct net net)
	54	{
9dd776b6	55	#ifdef CONFIG_NET
5f256bec	56	atomic_inc(&net->count);
9dd776b6	57	#endif
5f256bec EB	58	return net;
	59	}
	60
077130c0 EB	61	static inline struct net maybe_get_net(struct net net)
	62	{
	63	/* Used when we know struct net exists but we
	64	* aren't guaranteed a previous reference count
	65	* exists. If the reference count is zero this
	66	* function fails and returns NULL.
	67	*/
	68	if (!atomic_inc_not_zero(&net->count))
	69	net = NULL;
	70	return net;
	71	}
	72
5f256bec EB	73	static inline void put_net(struct net *net)
5f256bec EB	74	{
9dd776b6	75	#ifdef CONFIG_NET
5f256bec EB	76	if (atomic_dec_and_test(&net->count))
5f256bec EB	77	__put_net(net);
9dd776b6	78	#endif
5f256bec EB	79	}
	80
	81	static inline struct net hold_net(struct net net)
	82	{
9dd776b6	83	#ifdef CONFIG_NET
5f256bec	84	atomic_inc(&net->use_count);
9dd776b6	85	#endif
5f256bec EB	86	return net;
	87	}
	88
	89	static inline void release_net(struct net *net)
	90	{
9dd776b6	91	#ifdef CONFIG_NET
5f256bec	92	atomic_dec(&net->use_count);
9dd776b6	93	#endif
5f256bec EB	94	}
	95
	96	extern void net_lock(void);
	97	extern void net_unlock(void);
	98
	99	#define for_each_net(VAR) \
	100	list_for_each_entry(VAR, &net_namespace_list, list)
	101
	102
	103	struct pernet_operations {
	104	struct list_head list;
	105	int (init)(struct net net);
	106	void (exit)(struct net net);
	107	};
	108
	109	extern int register_pernet_subsys(struct pernet_operations *);
	110	extern void unregister_pernet_subsys(struct pernet_operations *);
	111	extern int register_pernet_device(struct pernet_operations *);
	112	extern void unregister_pernet_device(struct pernet_operations *);
	113
	114	#endif /* __NET_NET_NAMESPACE_H */