// -------------------------------------------------------------------------
// ipv4.h
//
// 21.12.2003, J. Ahrensfeld
//
// -------------------------------------------------------------------------
#ifndef IPV4_H
#define IPV4_H

#include "libsys.h"
#include "ethernet.h"

// -------------------------------------------------------------------------
typedef struct _sIPV4
{
	uint8_t ver_ihl;
	uint8_t tos;
	uint16_t len;
	uint16_t id;
	uint16_t flag_foff;
	uint8_t ttl;
	uint8_t proto;
	uint16_t hdr_chksum;
	uint8_t inet_addr_src[4];
	uint8_t inet_addr_dst[4];

} __attribute__ ((__packed__)) IPV4;

#define	IP_TYPE_ICMP					0x01
#define	IP_TYPE_TCP						0x06
#define	IP_TYPE_UDP						0x11

#define IPV4_AMSK_PRECEDENCE			0x07
#define IPV4_TOS_LOW_DELAY				0x08
#define IPV4_TOS_HIGH_THRUPUT			0x10
#define IPV4_TOS_HIGH_REL				0x20
#define IPV4_AMSK_FLAG					0xE000
#define IPV4_AMSK_FOFF					0x1FFF
#define IPV4_FLAG_RES					0x8000
#define IPV4_FLAG_DF					0x4000
#define IPV4_FLAG_MF					0x2000


#define IPV4_PRECENCE_NETWORK_CTRL		0x07	//          111 - Network Control
#define IPV4_PRECENCE_INTERNET_CTRL		0x06	//          110 - Internetwork Control
#define IPV4_PRECENCE_CRITIC_ECP		0x05	//          101 - CRITIC/ECP
#define IPV4_PRECENCE_FLASH_OVERRIDE    0x04	//	     	100 - Flash Override
#define IPV4_PRECENCE_FLASH				0x03	//          011 - Flash
#define IPV4_PRECENCE_IMMEDIATE			0x02	//          010 - Immediate
#define IPV4_PRECENCE_PRIORITY 			0x01	//          001 - Priority
#define IPV4_PRECENCE_ROUTINE			0x00	//          000 - Routine

// -------------------------------------------------------------------------
uint16_t IPv4ChkSum(uint16_t *pBuf, uint16_t acc, uint16_t len);
uint8_t *IPV4_create(packet_t *pPacket, uint16_t proto, uint16_t len, uint8_t *inet_addr_src, uint8_t *inet_addr_dst);

// -------------------------------------------------------------------------
#endif // IPV4_H