if_arp.h

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/*
 * 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, <[email protected]>
 *      Florian La Roche,
 *      Jonathan Layes <[email protected]>
 *      Arnaldo Carvalho de Melo <[email protected]> ARPHRD_HWX25
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#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 int arp_hdr_len(struct net_device *dev)
{
    /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
    return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
}
#endif  /* _LINUX_IF_ARP_H */