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net.h
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net.h
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#ifndef NET_H
#define NET_H
// notation: _P = position of a field
// _V = value of a field
// ******* 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_V 0x0800
#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 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
#define ARP_OPCODE_REQUEST_H_V 0x00
#define ARP_OPCODE_REQUEST_L_V 0x01
#define ARP_OPCODE_REPLY_H_V 0x00
#define ARP_OPCODE_REPLY_L_V 0x02
#define ARP_HARDWARE_TYPE_H_V 0x00
#define ARP_HARDWARE_TYPE_L_V 0x01
#define ARP_PROTOCOL_H_V 0x08
#define ARP_PROTOCOL_L_V 0x00
#define ARP_HARDWARE_SIZE_V 0x06
#define ARP_PROTOCOL_SIZE_V 0x04
#define ARP_HARDWARE_TYPE_H_P 0x0E
#define ARP_HARDWARE_TYPE_L_P 0x0F
#define ARP_PROTOCOL_H_P 0x10
#define ARP_PROTOCOL_L_P 0x11
#define ARP_HARDWARE_SIZE_P 0x12
#define ARP_PROTOCOL_SIZE_P 0x13
#define ARP_OPCODE_H_P 0x14
#define ARP_OPCODE_L_P 0x15
#define ARP_SRC_MAC_P 0x16
#define ARP_SRC_IP_P 0x1C
#define ARP_DST_MAC_P 0x20
#define 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 + 0)
#define IP_DST_P (0x1e + 0)
#define IP_HEADER_LEN_VER_P 0xe
// ******* ICMP *******
#define ICMP_TYPE_ECHOREPLY_V 0
#define ICMP_TYPE_ECHOREQUEST_V 8
//
#define ICMP_TYPE_P 0x22
#define ICMP_CHECKSUM_H_P 0x24
#define ICMP_CHECKSUM_L_P 0x25
// ******* 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 *******
// plain len without the options:
#define TCP_HEADER_LEN_PLAIN 20
#define TCP_FLAG_FIN_V 0x01
#define TCP_FLAGS_FIN_V 0x01
#define TCP_FLAGS_SYN_V 0x02
#define TCP_FLAG_SYN_V 0x02
#define TCP_FLAG_RST_V 0x04
#define TCP_FLAG_PUSH_V 0x08
#define TCP_FLAGS_ACK_V 0x10
#define TCP_FLAG_ACK_V 0x10
#define TCP_FLAG_URG_V 0x20
#define TCP_FLAG_ECE_V 0x40
#define TCP_FLAG_CWR_V 0x80
#define TCP_FLAGS_SYNACK_V 0x12
#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 // 4 bytes
#define TCP_SEQACK_H_P 0x2A
#define TCP_HEADER_LEN_P 0x2E
#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
#endif