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TOMOYO Linux Cross Reference
Linux/include/net/netns/generic.h

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  1 /*
  2  * generic net pointers
  3  */
  4 
  5 #ifndef __NET_GENERIC_H__
  6 #define __NET_GENERIC_H__
  7 
  8 #include <linux/bug.h>
  9 #include <linux/rcupdate.h>
 10 
 11 /*
 12  * Generic net pointers are to be used by modules to put some private
 13  * stuff on the struct net without explicit struct net modification
 14  *
 15  * The rules are simple:
 16  * 1. set pernet_operations->id.  After register_pernet_device you
 17  *    will have the id of your private pointer.
 18  * 2. set pernet_operations->size to have the code allocate and free
 19  *    a private structure pointed to from struct net.
 20  * 3. do not change this pointer while the net is alive;
 21  * 4. do not try to have any private reference on the net_generic object.
 22  *
 23  * After accomplishing all of the above, the private pointer can be
 24  * accessed with the net_generic() call.
 25  */
 26 
 27 struct net_generic {
 28         unsigned int len;
 29         struct rcu_head rcu;
 30 
 31         void *ptr[0];
 32 };
 33 
 34 static inline void *net_generic(const struct net *net, int id)
 35 {
 36         struct net_generic *ng;
 37         void *ptr;
 38 
 39         rcu_read_lock();
 40         ng = rcu_dereference(net->gen);
 41         BUG_ON(id == 0 || id > ng->len);
 42         ptr = ng->ptr[id - 1];
 43         rcu_read_unlock();
 44 
 45         BUG_ON(!ptr);
 46         return ptr;
 47 }
 48 #endif
 49 

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