blob: 0c04fd2a700bec2f1496278ea895bda1a7d596f1 [file] [log] [blame]
* generic net pointers
#ifndef __NET_GENERIC_H__
#define __NET_GENERIC_H__
#include <linux/rcupdate.h>
* Generic net pointers are to be used by modules to put some private
* stuff on the struct net without explicit struct net modification
* The rules are simple:
* 1. register the ops with register_pernet_gen_device to get the id
* of your private pointer;
* 2. call net_assign_generic() to put the private data on the struct
* net (most preferably this should be done in the ->init callback
* of the ops registered);
* 3. do not change this pointer while the net is alive;
* 4. do not try to have any private reference on the net_generic object.
* After accomplishing all of the above, the private pointer can be
* accessed with the net_generic() call.
struct net_generic {
unsigned int len;
struct rcu_head rcu;
void *ptr[0];
static inline void *net_generic(struct net *net, int id)
struct net_generic *ng;
void *ptr;
ng = rcu_dereference(net->gen);
BUG_ON(id == 0 || id > ng->len);
ptr = ng->ptr[id - 1];
return ptr;
extern int net_assign_generic(struct net *net, int id, void *data);