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1da177e4 LT |
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. | |
02c30a84 | 12 | * Ross Biro |
1da177e4 LT |
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 | ||
d0a92be0 | 26 | #include <linux/skbuff.h> |
607ca46e | 27 | #include <uapi/linux/if_arp.h> |
d0a92be0 ACM |
28 | |
29 | static inline struct arphdr *arp_hdr(const struct sk_buff *skb) | |
30 | { | |
31 | return (struct arphdr *)skb_network_header(skb); | |
32 | } | |
988b7050 PE |
33 | |
34 | static inline int arp_hdr_len(struct net_device *dev) | |
35 | { | |
6752c8db YH |
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 | } | |
988b7050 | 46 | } |
1da177e4 | 47 | #endif /* _LINUX_IF_ARP_H */ |