#ifndef ICMP_PACKET_H
#define ICMP_PACKET_H

#include <stdint.h>

/* ICMP Header Structure (RFC 792) */
struct icmp_header {
	uint8_t type;
	uint8_t code;
	uint16_t checksum;
	union {
		struct {
			uint16_t id;
			uint16_t seq;
		} echo;
		uint32_t gateway;
		struct {
			uint16_t unused;
			uint16_t mtu;
		} frag;
	} un;
} __attribute__((packed));

/* IP Header Structure */
struct ip_header {
	uint8_t version_ihl;
	uint8_t tos;
	uint16_t total_len;
	uint16_t id;
	uint16_t frag_off;
	uint8_t ttl;
	uint8_t protocol;
	uint16_t checksum;
	uint32_t saddr;
	uint32_t daddr;
} __attribute__((packed));

#endif