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/*
* @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);
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