//
// Created by epagris on 2022.11.03..
//

#ifndef ETHERLIB_ETHERNET_FRAME_H
#define ETHERLIB_ETHERNET_FRAME_H

#include <stdint.h>
#include "../../packet_registry.h"
#include "../../packet_sieve.h"

#define ETH_HW_ADDR_LEN (6)
#define ETH_ETHERNET_HEADER_SIZE (14)

#define HEADER_FETCH_PROPS(T,h) (T *)(&((h)->props))

#define ALLOC_HEADER_ELEMENT(T) (PcktHeaderElement *) dynmem_alloc(ETH_PCKT_HEADER_ELEMENT_HEAD_SIZE + sizeof(T))

#define HWACPY(dst,src) memcpy((dst),(src), ETH_HW_ADDR_LEN)

typedef uint8_t EthernetAddress[ETH_HW_ADDR_LEN];

extern EthernetAddress ETH_ETHERNET_IPMC_HWADDR;

/**
 * @struct EthernetProps
 * Ethernet frame properties
 */
typedef struct {
    PcktPropsHeader;
    EthernetAddress destAddr; ///< destination address
    EthernetAddress sourceAddr; ///< source address
    uint16_t length_type; ///< frame length_type
} EthernetProps;

struct EthInterface_;

/**
 * Parse raw Ethernet frames.
 * @param hdr pointer to the Ethernet packet header
 * @param size total frame size
 * @param pcktHdrLe pointer to property storage
 * @return EtherType or 0 (if size is less than 1500) on success or -1 on error
 */
int parse_ethernet(const uint8_t *hdr, uint32_t size, PcktHeaderElement *pcktHdrLe, struct EthInterface_ *intf);

/**
 * Insert Ethernet header to specified address.
 * @param hdr space where the header is to be inserted
 * @param headers linked list of header, top is always relevant
 */
void insert_ethernet_header(uint8_t * hdr, const PcktHeaderElement * headers);

#endif //ETHERLIB_ETHERNET_FRAME_H