5 #ifndef __NET_GENERIC_H__
6 #define __NET_GENERIC_H__
8 #include <linux/rcupdate.h>
11 * Generic net pointers are to be used by modules to put some private
12 * stuff on the struct net without explicit struct net modification
14 * The rules are simple:
15 * 1. set pernet_operations->id. After register_pernet_device you
16 * will have the id of your private pointer.
17 * 2. set pernet_operations->size to have the code allocate and free
18 * a private structure pointed to from struct net.
19 * 3. do not change this pointer while the net is alive;
20 * 4. do not try to have any private reference on the net_generic object.
22 * After accomplishing all of the above, the private pointer can be
23 * accessed with the net_generic() call.
33 static inline void *net_generic(const struct net
*net
, int id
)
35 struct net_generic
*ng
;
39 ng
= rcu_dereference(net
->gen
);
40 BUG_ON(id
== 0 || id
> ng
->len
);
41 ptr
= ng
->ptr
[id
- 1];