1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Global definitions for the ARP (RFC 826) protocol.
7 *
8 * Version: @(#)if_arp.h 1.0.1 04/16/93
9 *
10 * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
11 * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
12 * Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche,
15 * Jonathan Layes <layes@loran.com>
16 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23#ifndef _LINUX_IF_ARP_H
24#define _LINUX_IF_ARP_H
25
26#include <linux/skbuff.h>
27#include <uapi/linux/if_arp.h>
28
29static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
30{
31 return (struct arphdr *)skb_network_header(skb);
32}
33
34static inline unsigned int arp_hdr_len(const struct net_device *dev)
35{
36 switch (dev->type) {
37#if IS_ENABLED(CONFIG_FIREWIRE_NET)
38 case ARPHRD_IEEE1394:
39 /* ARP header, device address and 2 IP addresses */
40 return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
41#endif
42 default:
43 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
44 return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
45 }
46}
47
48static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
49{
50 switch (dev->type) {
51 case ARPHRD_TUNNEL:
52 case ARPHRD_TUNNEL6:
53 case ARPHRD_SIT:
54 case ARPHRD_IPGRE:
55 case ARPHRD_VOID:
56 case ARPHRD_NONE:
57 return false;
58 default:
59 return true;
60 }
61}
62
63#endif /* _LINUX_IF_ARP_H */
64