diff options
Diffstat (limited to 'include/net/net_namespace.h')
| -rw-r--r-- | include/net/net_namespace.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h new file mode 100644 index 00000000000..6344b77f81a --- /dev/null +++ b/include/net/net_namespace.h @@ -0,0 +1,68 @@ +/* + * 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 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 */ +}; + +extern struct net init_net; +extern struct list_head net_namespace_list; + +extern void __put_net(struct net *net); + +static inline struct net *get_net(struct net *net) +{ + atomic_inc(&net->count); + 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); +} + +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 */ |