1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
* device functionality on Windows.
*
* This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
*
* This source code is Copyright (C) 2002-2009 OpenVPN Technologies, Inc.,
* and is released under the GPL version 2 (see below).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//============================================================
// MAC address, Ethernet header, and ARP
//============================================================
#pragma pack(1)
#define IP_HEADER_SIZE 20
typedef unsigned char MACADDR [6];
typedef unsigned long IPADDR;
//-----------------
// Ethernet address
//-----------------
typedef struct {
MACADDR addr;
} ETH_ADDR;
typedef struct {
ETH_ADDR list[NIC_MAX_MCAST_LIST];
} MC_LIST;
//----------------
// Ethernet header
//----------------
typedef struct
{
MACADDR dest; /* destination eth addr */
MACADDR src; /* source ether addr */
# define ETH_P_IP 0x0800 /* IPv4 protocol */
# define ETH_P_ARP 0x0806 /* ARP protocol */
USHORT proto; /* packet type ID field */
} ETH_HEADER, *PETH_HEADER;
//----------------
// ARP packet
//----------------
typedef struct
{
MACADDR m_MAC_Destination; // Reverse these two
MACADDR m_MAC_Source; // to answer ARP requests
USHORT m_Proto; // 0x0806
# define MAC_ADDR_TYPE 0x0001
USHORT m_MAC_AddressType; // 0x0001
USHORT m_PROTO_AddressType; // 0x0800
UCHAR m_MAC_AddressSize; // 0x06
UCHAR m_PROTO_AddressSize; // 0x04
# define ARP_REQUEST 0x0001
# define ARP_REPLY 0x0002
USHORT m_ARP_Operation; // 0x0001 for ARP request, 0x0002 for ARP reply
MACADDR m_ARP_MAC_Source;
IPADDR m_ARP_IP_Source;
MACADDR m_ARP_MAC_Destination;
IPADDR m_ARP_IP_Destination;
}
ARP_PACKET, *PARP_PACKET;
//----------
// IP Header
//----------
typedef struct {
# define IPH_GET_VER(v) (((v) >> 4) & 0x0F)
# define IPH_GET_LEN(v) (((v) & 0x0F) << 2)
UCHAR version_len;
UCHAR tos;
USHORT tot_len;
USHORT id;
# define IP_OFFMASK 0x1fff
USHORT frag_off;
UCHAR ttl;
# define IPPROTO_UDP 17 /* UDP protocol */
# define IPPROTO_TCP 6 /* TCP protocol */
# define IPPROTO_ICMP 1 /* ICMP protocol */
# define IPPROTO_IGMP 2 /* IGMP protocol */
UCHAR protocol;
USHORT check;
ULONG saddr;
ULONG daddr;
/* The options start here. */
} IPHDR;
//-----------
// UDP header
//-----------
typedef struct {
USHORT source;
USHORT dest;
USHORT len;
USHORT check;
} UDPHDR;
//--------------------------
// TCP header, per RFC 793.
//--------------------------
typedef struct {
USHORT source; /* source port */
USHORT dest; /* destination port */
ULONG seq; /* sequence number */
ULONG ack_seq; /* acknowledgement number */
# define TCPH_GET_DOFF(d) (((d) & 0xF0) >> 2)
UCHAR doff_res;
# define TCPH_FIN_MASK (1<<0)
# define TCPH_SYN_MASK (1<<1)
# define TCPH_RST_MASK (1<<2)
# define TCPH_PSH_MASK (1<<3)
# define TCPH_ACK_MASK (1<<4)
# define TCPH_URG_MASK (1<<5)
# define TCPH_ECE_MASK (1<<6)
# define TCPH_CWR_MASK (1<<7)
UCHAR flags;
USHORT window;
USHORT check;
USHORT urg_ptr;
} TCPHDR;
#define TCPOPT_EOL 0
#define TCPOPT_NOP 1
#define TCPOPT_MAXSEG 2
#define TCPOLEN_MAXSEG 4
#pragma pack()
|
