LXR linux/include/linux/if

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              Global definitions for the ARP (RFC 826) protocol.
   8 *
   9 * Version:     @(#)if_arp.h    1.0.1   04/16/93
  10 *
  11 * Authors:     Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
  12 *              Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
  13 *              Ross Biro
  14 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  15 *              Florian La Roche,
  16 *              Jonathan Layes <layes@loran.com>
  17 *              Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
  18 */
  19#ifndef _LINUX_IF_ARP_H
  20#define _LINUX_IF_ARP_H
  21
  22#include <linux/skbuff.h>
  23#include <uapi/linux/if_arp.h>
  24
  25static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
  26{
  27        return (struct arphdr *)skb_network_header(skb);
  28}
  29
  30static inline unsigned int arp_hdr_len(const struct net_device *dev)
  31{
  32        switch (dev->type) {
  33#if IS_ENABLED(CONFIG_FIREWIRE_NET)
  34        case ARPHRD_IEEE1394:
  35                /* ARP header, device address and 2 IP addresses */
  36                return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
  37#endif
  38        default:
  39                /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
  40                return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
  41        }
  42}
  43
  44static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
  45{
  46        switch (dev->type) {
  47        case ARPHRD_TUNNEL:
  48        case ARPHRD_TUNNEL6:
  49        case ARPHRD_SIT:
  50        case ARPHRD_IPGRE:
  51        case ARPHRD_VOID:
  52        case ARPHRD_NONE:
  53        case ARPHRD_RAWIP:
  54                return false;
  55        default:
  56                return true;
  57        }
  58}
  59
  60#endif  /* _LINUX_IF_ARP_H */
  61