2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Global definitions for the ARP (RFC 826) protocol.
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*
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* Version: @(#)if_arp.h 1.0.1 04/16/93
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*
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* Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
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* Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Florian La Roche,
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* Jonathan Layes <layes@loran.com>
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
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*/
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#ifndef _LINUX_IF_ARP_H
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#define _LINUX_IF_ARP_H
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#include <linux/skbuff.h>
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#include <uapi/linux/if_arp.h>
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static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
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{
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return (struct arphdr *)skb_network_header(skb);
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}
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static inline unsigned int arp_hdr_len(const struct net_device *dev)
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{
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switch (dev->type) {
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#if IS_ENABLED(CONFIG_FIREWIRE_NET)
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case ARPHRD_IEEE1394:
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/* ARP header, device address and 2 IP addresses */
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return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
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#endif
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default:
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/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
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return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
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}
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}
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static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
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{
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switch (dev->type) {
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case ARPHRD_TUNNEL:
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case ARPHRD_TUNNEL6:
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case ARPHRD_SIT:
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case ARPHRD_IPGRE:
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case ARPHRD_IP6GRE:
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case ARPHRD_VOID:
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case ARPHRD_NONE:
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case ARPHRD_RAWIP:
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case ARPHRD_PIMREG:
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2023-10-24 12:59:35 +02:00
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/* PPP adds its l2 header automatically in ppp_start_xmit().
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* This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
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*/
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case ARPHRD_PPP:
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2023-08-30 17:31:07 +02:00
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return false;
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default:
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return true;
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}
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}
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#endif /* _LINUX_IF_ARP_H */
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