rpi4-osdev/part15-tcpip-webserver/tcpip/net.h

/*********************************************
 * 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:LGPL V2
 * See http://www.gnu.org/licenses/old-licenses/lgpl-2.0.html
 *
 * 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.
 *
 *********************************************/

// 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
// ip.src
#define IP_SRC_P 0x1a
#define IP_DST_P 0x1e
#define IP_HEADER_LEN_VER_P 0xe
#define IP_CHECKSUM_P 0x18
#define IP_TTL_P 0x16
#define IP_FLAGS_P 0x14
#define IP_P 0xe
#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_PROTO_P 0x17

#define IP_PROTO_ICMP_V 1
#define IP_PROTO_TCP_V 6
// 17=0x11
#define IP_PROTO_UDP_V 17
// ******* 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_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
// the tcp seq number is 4 bytes 0x26-0x29
#define TCP_SEQ_H_P 0x26
#define TCP_SEQACK_H_P 0x2a
// flags: SYN=2
#define TCP_FLAGS_P 0x2f
#define TCP_FLAGS_SYN_V 2
#define TCP_FLAGS_FIN_V 1
#define TCP_FLAGS_RST_V 4
#define TCP_FLAGS_PUSH_V 8
#define TCP_FLAGS_SYNACK_V 0x12
#define TCP_FLAGS_ACK_V 0x10
#define TCP_FLAGS_PSHACK_V 0x18
//  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
//
#endif
//@}