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         struct list_head        dev_base_head;
  27         struct hlist_head       *dev_name_head;
  28         struct hlist_head       *dev_index_head;
  29 };
  30
  31 extern struct net init_net;
  32 extern struct list_head net_namespace_list;
  33
  34 extern void __put_net(struct net *net);
  35
  36 static inline struct net *get_net(struct net *net)
  37 {
  38         atomic_inc(&net->count);
  39         return net;
  40 }
  41
  42 static inline void put_net(struct net *net)
  43 {
  44         if (atomic_dec_and_test(&net->count))
  45                 __put_net(net);
  46 }
  47
  48 static inline struct net *hold_net(struct net *net)
  49 {
  50         atomic_inc(&net->use_count);
  51         return net;
  52 }
  53
  54 static inline void release_net(struct net *net)
  55 {
  56         atomic_dec(&net->use_count);
  57 }
  58
  59 extern void net_lock(void);
  60 extern void net_unlock(void);
  61
  62 #define for_each_net(VAR)                               \
  63         list_for_each_entry(VAR, &net_namespace_list, list)
  64
  65
  66 struct pernet_operations {
  67         struct list_head list;
  68         int (*init)(struct net *net);
  69         void (*exit)(struct net *net);
  70 };
  71
  72 extern int register_pernet_subsys(struct pernet_operations *);
  73 extern void unregister_pernet_subsys(struct pernet_operations *);
  74 extern int register_pernet_device(struct pernet_operations *);
  75 extern void unregister_pernet_device(struct pernet_operations *);
  76
  77 #endif /* __NET_NET_NAMESPACE_H */