blob: 8a1ab47c3fb3f9ea9fbadf8c30025a30f27d7eaa [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* generic net pointers
#ifndef __NET_GENERIC_H__
#define __NET_GENERIC_H__
#include <linux/bug.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. set pernet_operations->id. After register_pernet_device you
* will have the id of your private pointer.
* 2. set pernet_operations->size to have the code allocate and free
* a private structure pointed to from struct net.
* 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 {
union {
struct {
unsigned int len;
struct rcu_head rcu;
} s;
void *ptr[0];
static inline void *net_generic(const struct net *net, unsigned int id)
struct net_generic *ng;
void *ptr;
ng = rcu_dereference(net->gen);
ptr = ng->ptr[id];
return ptr;