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51 lines
1.1 KiB
51 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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/bug.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. set pernet_operations->id. After register_pernet_device you |
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* will have the id of your private pointer. |
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* 2. set pernet_operations->size to have the code allocate and free |
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* a private structure pointed to from struct net. |
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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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union { |
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struct { |
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unsigned int len; |
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struct rcu_head rcu; |
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} s; |
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void *ptr[0]; |
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}; |
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}; |
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static inline void *net_generic(const struct net *net, unsigned 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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ptr = ng->ptr[id]; |
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rcu_read_unlock(); |
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return ptr; |
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} |
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#endif
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