/* SPDX-License-Identifier: GPL-2.0-or-later */

  /*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Global definitions for the ARP (RFC 826) protocol.
   *
   * Version:	@(#)if_arp.h	1.0.1	04/16/93
   *
   * Authors:	Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
   *		Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.

   *		Ross Biro

   *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   *		Florian La Roche,
   *		Jonathan Layes <layes@loran.com>
   *		Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25

   */
  #ifndef _LINUX_IF_ARP_H
  #define _LINUX_IF_ARP_H

  #include <linux/skbuff.h>

  #include <uapi/linux/if_arp.h>

  
  static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
  {
  	return (struct arphdr *)skb_network_header(skb);
  }

  static inline unsigned int arp_hdr_len(const struct net_device *dev)

  {

  	switch (dev->type) {
  #if IS_ENABLED(CONFIG_FIREWIRE_NET)
  	case ARPHRD_IEEE1394:
  		/* ARP header, device address and 2 IP addresses */
  		return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
  #endif
  	default:
  		/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
  		return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
  	}

  }

  
  static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
  {
  	switch (dev->type) {
  	case ARPHRD_TUNNEL:
  	case ARPHRD_TUNNEL6:
  	case ARPHRD_SIT:
  	case ARPHRD_IPGRE:
  	case ARPHRD_VOID:
  	case ARPHRD_NONE:

  	case ARPHRD_RAWIP:

  		return false;
  	default:
  		return true;
  	}
  }

  #endif	/* _LINUX_IF_ARP_H */