/*
 * @file
 * https://en.wikipedia.org/wiki/OSI_model
 */
#include <stdint.h>

#define ARP_ETHERNET 1
#define ARP_IPV4 0x800
#define ARP_REPLY 2
#define ARP_REQUEST 1

#define ETH_P_ARP	0x0806
#define ETH_P_IPV4	0x0800

#define IPV4_P_ICMP	0x1

#define ICMP_ECHO_REPLY 0
#define ICMP_UNREACHABLE 3
#define ICMP_ECHO_REQUEST 8

uint16_t checksum(void *addr, int count);
uint16_t ntohs(uint16_t val);
uint16_t htons(uint16_t val);