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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253/* 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>#include <net/net_namespace.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;
DECLARE_FLEX_ARRAY(void *, ptr); };};
static inline void *net_generic(const struct net *net, unsigned int id){ struct net_generic *ng; void *ptr;
rcu_read_lock(); ng = rcu_dereference(net->gen); ptr = ng->ptr[id]; rcu_read_unlock();
return ptr;}#endif