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/* 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;

	rcu_read_lock();
	ng = rcu_dereference(net->gen);
	ptr = ng->ptr[id];
	rcu_read_unlock();

	return ptr;
}
#endif

Filemanager

Name Type Size Permission Actions
can.h File 1.08 KB 0644
conntrack.h File 2.72 KB 0644
core.h File 285 B 0644
dccp.h File 185 B 0644
generic.h File 1.15 KB 0644
hash.h File 212 B 0644
ieee802154_6lowpan.h File 399 B 0644
ipv4.h File 5.2 KB 0644
ipv6.h File 2.64 KB 0644
mib.h File 986 B 0644
mpls.h File 371 B 0644
netfilter.h File 689 B 0644
nftables.h File 440 B 0644
packet.h File 295 B 0644
sctp.h File 3.83 KB 0644
unix.h File 263 B 0644
x_tables.h File 507 B 0644
xfrm.h File 1.84 KB 0644