/* *  TAP-Win32 -- A kernel driver to provide virtual tap device functionality *               on Windows.  Originally derived from the CIPE-Win32 *               project by Damion K. Wilson, with extensive modifications by *               James Yonan. * *  All source code which derives from the CIPE-Win32 project is *  Copyright (C) Damion K. Wilson, 2003, and is released under the *  GPL version 2 (see below). * *  All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC, *  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 20typedef 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()