include/net/net_namespace.h

   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
  11 struct proc_dir_entry;
  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 */
  21
  22         struct proc_dir_entry   *proc_net;
  23         struct proc_dir_entry   *proc_net_stat;
  24         struct proc_dir_entry   *proc_net_root;
  25 };
  26
  27 extern struct net init_net;
  28 extern struct list_head net_namespace_list;
  29
  30 extern void __put_net(struct net *net);
  31
  32 static inline struct net *get_net(struct net *net)
  33 {
  34         atomic_inc(&net->count);
  35         return net;
  36 }
  37
  38 static inline void put_net(struct net *net)
  39 {
  40         if (atomic_dec_and_test(&net->count))
  41                 __put_net(net);
  42 }
  43
  44 static inline struct net *hold_net(struct net *net)
  45 {
  46         atomic_inc(&net->use_count);
  47         return net;
  48 }
  49
  50 static inline void release_net(struct net *net)
  51 {
  52         atomic_dec(&net->use_count);
  53 }
  54
  55 extern void net_lock(void);
  56 extern void net_unlock(void);
  57
  58 #define for_each_net(VAR)                               \
  59         list_for_each_entry(VAR, &net_namespace_list, list)
  60
  61
  62 struct pernet_operations {
  63         struct list_head list;
  64         int (*init)(struct net *net);
  65         void (*exit)(struct net *net);
  66 };
  67
  68 extern int register_pernet_subsys(struct pernet_operations *);
  69 extern void unregister_pernet_subsys(struct pernet_operations *);
  70 extern int register_pernet_device(struct pernet_operations *);
  71 extern void unregister_pernet_device(struct pernet_operations *);
  72
  73 #endif /* __NET_NET_NAMESPACE_H */