#ifndef ETHERLIB_TEST_ICMP_PACKET_H
#define ETHERLIB_TEST_ICMP_PACKET_H

#include <stdint.h>
#include "ipv4_types.h"
#include "ethernet_frame.h"

#define ETH_ICMP_PACKET_CLASS (0x0001)
#define ETH_ICMP_HEADER_SIZE (8)

typedef enum {
    ICMP_MT_ECHO_REPLY = 0x00,
    ICMP_MT_ECHO_REQUEST = 0x08
} IcmpMsgType;

/**
 * ICMP packet properties.
 */
typedef struct {
    PcktPropsHeader

    uint8_t type; ///< ICMP message type
    uint8_t code; ///< ICMP message code (~subtype)
    uint16_t checksum; ///< Checksum for the entire packet
    uint16_t identifier; ///< Identifier
    uint16_t sequenceNumber; ///< Sequence number
} IcmpProps;

/**
 * Parse ICMP packet header
 * @param hdr pointer to the beginning of ICMP header
 * @param size packet size
 * @param pcktHdrLe linked list of packet headers
 * @param intf Ethernet interface through which transmission and reception is carried out
 * @return always 0
 */
int parse_icmp(const uint8_t *hdr, uint32_t size, PcktHeaderElement *pcktHdrLe, struct EthInterface_ *intf);

/**
 * Insert ICMP header.
 * @param hdr pointer to message header
 * @param headers linked list of recursively encapsulated packet headers
 */
void insert_icmp_header(uint8_t * hdr, const PcktHeaderElement * headers);

#endif //ETHERLIB_TEST_ICMP_PACKET_H