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/* 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_IP6GRE:
case ARPHRD_VOID:
case ARPHRD_NONE:
case ARPHRD_RAWIP:
case ARPHRD_PIMREG:
/* PPP adds its l2 header automatically in ppp_start_xmit().
* This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
*/
case ARPHRD_PPP:
return false;
default:
return true;
}
}
#endif /* _LINUX_IF_ARP_H */
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