badvpn/misc/arp_proto.h

/**
 * @file arp_proto.h
 * @author Ambroz Bizjak <ambrop7@gmail.com>
 * 
 * @section LICENSE
 * 
 * This file is part of BadVPN.
 * 
 * BadVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 * 
 * BadVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * @section DESCRIPTION
 * 
 * Definitions for the ARP protocol.
 */

#ifndef BADVPN_ARP_PROTO_H
#define BADVPN_ARP_PROTO_H

#include <stdint.h>

#define ARP_HARDWARE_TYPE_ETHERNET 1

#define ARP_OPCODE_REQUEST 1
#define ARP_OPCODE_REPLY 2

struct arp_packet {
    uint16_t hardware_type;
    uint16_t protocol_type;
    uint8_t hardware_size;
    uint8_t protocol_size;
    uint16_t opcode;
    uint8_t sender_mac[6];
    uint32_t sender_ip;
    uint8_t target_mac[6];
    uint32_t target_ip;
} __attribute__((packed));

#endif