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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * generic net pointers
  4  */
  5 
  6 #ifndef __NET_GENERIC_H__
  7 #define __NET_GENERIC_H__
  8 
  9 #include <linux/bug.h>
 10 #include <linux/rcupdate.h>
 11 
 12 /*
 13  * Generic net pointers are to be used by modules to put some private
 14  * stuff on the struct net without explicit struct net modification
 15  *
 16  * The rules are simple:
 17  * 1. set pernet_operations->id.  After register_pernet_device you
 18  *    will have the id of your private pointer.
 19  * 2. set pernet_operations->size to have the code allocate and free
 20  *    a private structure pointed to from struct net.
 21  * 3. do not change this pointer while the net is alive;
 22  * 4. do not try to have any private reference on the net_generic object.
 23  *
 24  * After accomplishing all of the above, the private pointer can be
 25  * accessed with the net_generic() call.
 26  */
 27 
 28 struct net_generic {
 29         union {
 30                 struct {
 31                         unsigned int len;
 32                         struct rcu_head rcu;
 33                 } s;
 34 
 35                 void *ptr[0];
 36         };
 37 };
 38 
 39 static inline void *net_generic(const struct net *net, unsigned int id)
 40 {
 41         struct net_generic *ng;
 42         void *ptr;
 43 
 44         rcu_read_lock();
 45         ng = rcu_dereference(net->gen);
 46         ptr = ng->ptr[id];
 47         rcu_read_unlock();
 48 
 49         return ptr;
 50 }
 51 #endif
 52 

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