/* SPDX-License-Identifier: GPL-2.0 */#ifndef _NET_INET_DATALINK_H_#define _NET_INET_DATALINK_H_ #include <linux/list.h> struct llc_sap;struct net_device;struct packet_type;struct sk_buff; struct datalink_proto {        unsigned char   type[8]; 	struct llc_sap   *sap;         unsigned short  header_length;         int     (*rcvfunc)(struct sk_buff *, struct net_device *,                                struct packet_type *, struct net_device *);	int     (*request)(struct datalink_proto *, struct sk_buff *,			   const unsigned char *);	struct list_head node;}; #endif