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