#ifndef __NET_NET_NAMESPACE_WRAPPER_H
#define __NET_NET_NAMESPACE_WRAPPER_H 1

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
/* <net/net_namespace.h> exists, go ahead and include it. */
#include_next <net/net_namespace.h>
#else
/* No network namespace support. */
struct net;

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

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

#define __net_init      __init
#define __net_exit      __exit
#endif /* 2.6.24 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
#ifdef CONFIG_NET_NS
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return net1 == net2;
}
#else
static inline
int net_eq(const struct net *net1, const struct net *net2)
{
	return 1;
}
#endif /* CONFIG_NET_NS */
#endif /* 2.6.26 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
#ifdef CONFIG_NET_NS

static inline void write_pnet(struct net **pnet, struct net *net)
{
	*pnet = net;
}

static inline struct net *read_pnet(struct net * const *pnet)
{
	return *pnet;
}

#else

#define write_pnet(pnet, net)   do { (void)(net); } while (0)

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
#define read_pnet(pnet)         (&init_net)
#else
#define read_pnet(pnet)         (NULL)
#endif /* 2.6.24 */

#endif /* CONFIG_NET_NS */
#endif /* 2.6.29 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
struct rpl_pernet_operations {
	int (*init)(struct net *net);
	void (*exit)(struct net *net);
	int *id;
	size_t size;
	struct pernet_operations ops;
};
#define pernet_operations rpl_pernet_operations

#define register_pernet_device rpl_register_pernet_gen_device
#define unregister_pernet_device rpl_unregister_pernet_gen_device

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
extern int rpl_register_pernet_gen_device(struct rpl_pernet_operations *ops);
extern void rpl_unregister_pernet_gen_device(struct rpl_pernet_operations *ops);

#else /* for 2.6.32* */

int compat_init_net(struct net *net, struct rpl_pernet_operations *pnet);
void compat_exit_net(struct net *net, struct rpl_pernet_operations *pnet);

#define DEFINE_COMPAT_PNET_REG_FUNC(TYPE)					\
									\
static struct rpl_pernet_operations *pnet_gen_##TYPE;			\
static int compat_init_net_gen_##TYPE(struct net *net)	\
{									\
	return compat_init_net(net, pnet_gen_##TYPE);			\
}									\
									\
static void compat_exit_net_gen_##TYPE(struct net *net)	\
{									\
	compat_exit_net(net, pnet_gen_##TYPE);				\
}									\
									\
static int rpl_register_pernet_gen_##TYPE(struct rpl_pernet_operations *rpl_pnet)	\
{										\
	pnet_gen_##TYPE = rpl_pnet;						\
	rpl_pnet->ops.init = compat_init_net_gen_##TYPE;			\
	rpl_pnet->ops.exit = compat_exit_net_gen_##TYPE;			\
	return register_pernet_gen_##TYPE(pnet_gen_##TYPE->id, &rpl_pnet->ops); \
}											\
											\
static void rpl_unregister_pernet_gen_##TYPE(struct rpl_pernet_operations *rpl_pnet)		\
{											\
	unregister_pernet_gen_##TYPE(*pnet_gen_##TYPE->id, &rpl_pnet->ops);		\
}
#endif
#endif /* 2.6.33 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) || \
    LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
#define DEFINE_COMPAT_PNET_REG_FUNC(TYPE)
#endif /* 2.6.33 */

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
#undef for_each_net
#define for_each_net(net)   { net = NULL; }

#endif /* 2.6.32 */

#endif /* net/net_namespace.h wrapper */