/*********************************************
 * vim:sw=8:ts=8:si:et
 * To use the above modeline in vim you must have "set modeline" in your .vimrc
 * Author: Guido Socher 
 * Copyright: GPL V2
 *
 * Based on the net.h file from the AVRlib library by Pascal Stang.
 * For AVRlib See http://www.procyonengineering.com/
 * Used with explicit permission of Pascal Stang.
 *
 * Chip type           : ATMEGA88 with ENC28J60
 *********************************************/

// notation: _P = position of a field
//           _V = value of a field

//@{

#ifndef NET_H
#define NET_H

// ******* ETH *******
#define ETH_HEADER_LEN	14
// values of certain bytes:
#define ETHTYPE_ARP_H_V 0x08
#define ETHTYPE_ARP_L_V 0x06
#define ETHTYPE_IP_H_V  0x08
#define ETHTYPE_IP_L_V  0x00
// byte positions in the ethernet frame:
//
// Ethernet type field (2bytes):
#define ETH_TYPE_H_P 12
#define ETH_TYPE_L_P 13
//
#define ETH_DST_MAC 0
#define ETH_SRC_MAC 6


// ******* ARP *******
#define ETH_ARP_OPCODE_REPLY_H_V 0x0
#define ETH_ARP_OPCODE_REPLY_L_V 0x02
#define ETH_ARP_OPCODE_REQ_H_V 0x0
#define ETH_ARP_OPCODE_REQ_L_V 0x01
// start of arp header:
#define ETH_ARP_P 0xe
//
#define ETHTYPE_ARP_L_V 0x06
// arp.dst.ip
#define ETH_ARP_DST_IP_P 0x26
// arp.opcode
#define ETH_ARP_OPCODE_H_P 0x14
#define ETH_ARP_OPCODE_L_P 0x15
// arp.src.mac
#define ETH_ARP_SRC_MAC_P 0x16
#define ETH_ARP_SRC_IP_P 0x1c
#define ETH_ARP_DST_MAC_P 0x20
#define ETH_ARP_DST_IP_P 0x26

// ******* IP *******
#define IP_HEADER_LEN		20

#define IP_PROTO_ICMP_V		0x01
#define IP_PROTO_TCP_V		0x06
#define IP_PROTO_UDP_V		0x11
#define IP_V4_V				0x40
#define IP_HEADER_LENGTH_V	0x05

#define IP_P				0x0E
#define IP_HEADER_VER_LEN_P	0x0E
#define IP_TOS_P			0x0F
#define IP_TOTLEN_H_P		0x10
#define IP_TOTLEN_L_P		0x11
#define IP_ID_H_P			0x12
#define IP_ID_L_P			0x13
#define IP_FLAGS_P 			0x14     
#define IP_FLAGS_H_P		0x14
#define IP_FLAGS_L_P		0x15
#define IP_TTL_P			0x16
#define IP_PROTO_P			0x17
#define IP_CHECKSUM_P 		0x18 
#define IP_CHECKSUM_H_P		0x18
#define IP_CHECKSUM_L_P		0x19
#define IP_SRC_IP_P			0x1A
#define IP_DST_IP_P			0x1E

#define IP_SRC_P 			0x1a
#define IP_DST_P 			0x1e
#define IP_HEADER_LEN_VER_P 0xe

// ip.src
/*
#define IP_SRC_P 0x1a
#define IP_DST_P 0x1e
#define IP_P 0xe
#define IP_HEADER_LEN_VER_P 0xe
#define IP_CHECKSUM_P 0x18
#define IP_TTL_P 0x16
#define IP_FLAGS_P 0x14
#define IP_TOTLEN_H_P 0x10
#define IP_TOTLEN_L_P 0x11

#define IP_PROTO_P 0x17  

#define IP_PROTO_ICMP_V 1
#define IP_PROTO_TCP_V 6
// 17=0x11
#define IP_PROTO_UDP_V 17
#define IP_V4_V         0x40
*/
// ******* ICMP *******
#define ICMP_TYPE_ECHOREPLY_V 0
#define ICMP_TYPE_ECHOREQUEST_V 8
//
#define ICMP_TYPE_P 0x22
#define ICMP_CHECKSUM_P 0x24
#define ICMP_CHECKSUM_H_P 0x24
#define ICMP_CHECKSUM_L_P 0x25
#define ICMP_IDENT_H_P 0x26
#define ICMP_IDENT_L_P 0x27
#define ICMP_DATA_P 0x2a

// ******* UDP *******
#define UDP_HEADER_LEN	8
//
#define UDP_SRC_PORT_H_P 0x22
#define UDP_SRC_PORT_L_P 0x23
#define UDP_DST_PORT_H_P 0x24
#define UDP_DST_PORT_L_P 0x25
//
#define UDP_LEN_H_P 0x26
#define UDP_LEN_L_P 0x27
#define UDP_CHECKSUM_H_P 0x28
#define UDP_CHECKSUM_L_P 0x29
#define UDP_DATA_P 0x2a

// ******* TCP *******
#define TCP_FLAGS_FIN_V		0x01
#define TCP_FLAGS_SYN_V		0x02
#define TCP_FLAGS_RST_V         0x04
#define TCP_FLAGS_PUSH_V        0x08
#define TCP_FLAGS_ACK_V		0x10
#define TCP_FLAGS_SYNACK_V 	0x12
#define TCP_FLAGS_PSHACK_V      0x18

#define TCP_SRC_PORT_H_P 0x22
#define TCP_SRC_PORT_L_P 0x23
#define TCP_DST_PORT_H_P 0x24
#define TCP_DST_PORT_L_P 0x25
#define TCP_SEQ_P        0x26   // the tcp seq number is 4 bytes 0x26-0x29
#define TCP_SEQ_H_P      0x26
#define TCP_SEQACK_P     0x2a
#define TCP_SEQACK_H_P   0x2a
// flags: SYN=2
#define TCP_FLAGS_P 0x2f
//#define TCP_FLAG_P 0x2f
#define TCP_WINDOWSIZE_H_P	0x30	// 2 bytes
#define TCP_WINDOWSIZE_L_P	0x31
#define TCP_CHECKSUM_H_P 	0x32
#define TCP_CHECKSUM_L_P 	0x33
#define TCP_URGENT_PTR_H_P 	0x34	// 2 bytes
#define TCP_URGENT_PTR_L_P 	0x35
#define TCP_OPTIONS_P 		0x36
#define TCP_DATA_P			0x36
//  plain len without the options:
#define TCP_HEADER_LEN_PLAIN 20
#define TCP_HEADER_LEN_P 0x2e
#define TCP_WIN_SIZE 0x30
#define TCP_CHECKSUM_H_P 0x32
#define TCP_CHECKSUM_L_P 0x33
#define TCP_OPTIONS_P 0x36
//
//

// DNS States for access in applications
#define DNS_STATE_INIT 0
#define DNS_STATE_REQUESTED 1
#define DNS_STATE_ANSWER 2

// DHCP States for access in applications
#define DHCP_STATE_INIT 0
#define DHCP_STATE_DISCOVER 1
#define DHCP_STATE_OFFER 2
#define DHCP_STATE_REQUEST 3
#define DHCP_STATE_ACK 4
#define DHCP_STATE_OK 5
#define DHCP_STATE_RENEW 6


#endif
//@}

