/* ethernet.h */
/* 
 * Routines for taking ethernet packets apart.
 */

#ifndef _ethernet_h
#define _ethernet_h

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#include "pcap.h"

typedef struct ethernet_packet_s
{
  // Source address.
  uint8_t src_addr[6];

  // Destination ddress.
  uint8_t dst_addr[6];


  // 0x5DC is the maximum frame length in 802.3
#define ETHERNET_MAY_BE_IP(typeorlen) ((typeorlen) == 0x800 || (typeorlen) <= 0x5DC)

#define ETHERNET_TYPE_IP 0x800
  // Type
  uint16_t typeorlen;

  // Checksum if present. Note that pcap doesn't include checksums.
  uint32_t checksum;
} ethernet_packet_t;

#define ETHERNET_ERR_PKT_TOO_SHORT (-1)

/*
 * \param out_st OUT Index into data at which ethernet payload starts.
 * \param out_len OUT Length of the ethernet payload.
 * \return 0 on success, -1 on failure.
 *

 */
int ethernet_packet_from_pcap(pcaprec_hdr_t *hdr, 
			      const uint8_t *data,
			      const uint32_t len,
			      ethernet_packet_t *pkt,
			      uint32_t *out_st,
			      uint32_t *out_len);
			      



#endif

/* End file */