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NAME	SIZE	ACTIONS
📄 bpf.h	590 B	[ EDIT ] \| [ DEL ]
📄 can.h	1,109 B	[ EDIT ] \| [ DEL ]
📄 conntrack.h	3,017 B	[ EDIT ] \| [ DEL ]
📄 core.h	362 B	[ EDIT ] \| [ DEL ]
📄 dccp.h	185 B	[ EDIT ] \| [ DEL ]
📄 generic.h	1,175 B	[ EDIT ] \| [ DEL ]
📄 hash.h	212 B	[ EDIT ] \| [ DEL ]
📄 ieee802154_6lowpan.h	399 B	[ EDIT ] \| [ DEL ]
📄 ipv4.h	5,482 B	[ EDIT ] \| [ DEL ]
📄 ipv6.h	2,963 B	[ EDIT ] \| [ DEL ]
📄 mib.h	1,097 B	[ EDIT ] \| [ DEL ]
📄 mpls.h	371 B	[ EDIT ] \| [ DEL ]
📄 netfilter.h	1,048 B	[ EDIT ] \| [ DEL ]
📄 nftables.h	275 B	[ EDIT ] \| [ DEL ]
📄 packet.h	295 B	[ EDIT ] \| [ DEL ]
📄 sctp.h	3,997 B	[ EDIT ] \| [ DEL ]
📄 smc.h	604 B	[ EDIT ] \| [ DEL ]
📄 unix.h	263 B	[ EDIT ] \| [ DEL ]
📄 x_tables.h	507 B	[ EDIT ] \| [ DEL ]
📄 xdp.h	331 B	[ EDIT ] \| [ DEL ]
📄 xfrm.h	1,880 B	[ EDIT ] \| [ DEL ]

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EDIT: generic.h

/* 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