release/src/router/openvpn/tap-win32/tmp/proto.h

   1 /*
   2  *  TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
   3  *                         device functionality on Windows.
   4  *
   5  *  This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
   6  *
   7  *  This source code is Copyright (C) 2002-2009 OpenVPN Technologies, Inc.,
   8  *  and is released under the GPL version 2 (see below), however due
   9  *  to the extra costs of supporting Windows Vista, OpenVPN Solutions
  10  *  LLC reserves the right to change the terms of the TAP-Win32/TAP-Win64
  11  *  license for versions 9.1 and higher prior to the official release of
  12  *  OpenVPN 2.1.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License version 2
  16  *  as published by the Free Software Foundation.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program (see the file COPYING included with this
  25  *  distribution); if not, write to the Free Software Foundation, Inc.,
  26  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  */
  28
  29 //============================================================
  30 // MAC address, Ethernet header, and ARP
  31 //============================================================
  32
  33 #pragma pack(1)
  34
  35 #define IP_HEADER_SIZE 20
  36
  37 typedef unsigned char MACADDR [6];
  38 typedef unsigned long IPADDR;
  39
  40 //-----------------
  41 // Ethernet address
  42 //-----------------
  43
  44 typedef struct {
  45   MACADDR addr;
  46 } ETH_ADDR;
  47
  48 typedef struct {
  49   ETH_ADDR list[NIC_MAX_MCAST_LIST];
  50 } MC_LIST;
  51
  52 //----------------
  53 // Ethernet header
  54 //----------------
  55
  56 typedef struct
  57 {
  58   MACADDR dest;               /* destination eth addr   */
  59   MACADDR src;                /* source ether addr      */
  60
  61 # define ETH_P_IP   0x0800    /* IPv4 protocol */
  62 # define ETH_P_ARP  0x0806    /* ARP protocol */
  63   USHORT proto;               /* packet type ID field   */
  64 } ETH_HEADER, *PETH_HEADER;
  65
  66 //----------------
  67 // ARP packet
  68 //----------------
  69
  70 typedef struct
  71    {
  72     MACADDR        m_MAC_Destination;        // Reverse these two
  73     MACADDR        m_MAC_Source;             // to answer ARP requests
  74     USHORT         m_Proto;                  // 0x0806
  75
  76 #   define MAC_ADDR_TYPE 0x0001
  77     USHORT         m_MAC_AddressType;        // 0x0001
  78
  79     USHORT         m_PROTO_AddressType;      // 0x0800
  80     UCHAR          m_MAC_AddressSize;        // 0x06
  81     UCHAR          m_PROTO_AddressSize;      // 0x04
  82
  83 #   define ARP_REQUEST 0x0001
  84 #   define ARP_REPLY   0x0002
  85     USHORT         m_ARP_Operation;          // 0x0001 for ARP request, 0x0002 for ARP reply
  86
  87     MACADDR        m_ARP_MAC_Source;
  88     IPADDR         m_ARP_IP_Source;
  89     MACADDR        m_ARP_MAC_Destination;
  90     IPADDR         m_ARP_IP_Destination;
  91    }
  92 ARP_PACKET, *PARP_PACKET;
  93
  94 //----------
  95 // IP Header
  96 //----------
  97
  98 typedef struct {
  99 # define IPH_GET_VER(v) (((v) >> 4) & 0x0F)
 100 # define IPH_GET_LEN(v) (((v) & 0x0F) << 2)
 101   UCHAR    version_len;
 102
 103   UCHAR    tos;
 104   USHORT   tot_len;
 105   USHORT   id;
 106
 107 # define IP_OFFMASK 0x1fff
 108   USHORT   frag_off;
 109
 110   UCHAR    ttl;
 111
 112 # define IPPROTO_UDP  17  /* UDP protocol */
 113 # define IPPROTO_TCP   6  /* TCP protocol */
 114 # define IPPROTO_ICMP  1  /* ICMP protocol */
 115 # define IPPROTO_IGMP  2  /* IGMP protocol */
 116   UCHAR    protocol;
 117
 118   USHORT   check;
 119   ULONG    saddr;
 120   ULONG    daddr;
 121   /* The options start here. */
 122 } IPHDR;
 123
 124 //-----------
 125 // UDP header
 126 //-----------
 127
 128 typedef struct {
 129   USHORT   source;
 130   USHORT   dest;
 131   USHORT   len;
 132   USHORT   check;
 133 } UDPHDR;
 134
 135 //--------------------------
 136 // TCP header, per RFC 793.
 137 //--------------------------
 138
 139 typedef struct {
 140   USHORT      source;    /* source port */
 141   USHORT      dest;      /* destination port */
 142   ULONG       seq;       /* sequence number */
 143   ULONG       ack_seq;   /* acknowledgement number */
 144
 145 # define TCPH_GET_DOFF(d) (((d) & 0xF0) >> 2)
 146   UCHAR       doff_res;
 147
 148 # define TCPH_FIN_MASK (1<<0)
 149 # define TCPH_SYN_MASK (1<<1)
 150 # define TCPH_RST_MASK (1<<2)
 151 # define TCPH_PSH_MASK (1<<3)
 152 # define TCPH_ACK_MASK (1<<4)
 153 # define TCPH_URG_MASK (1<<5)
 154 # define TCPH_ECE_MASK (1<<6)
 155 # define TCPH_CWR_MASK (1<<7)
 156   UCHAR       flags;
 157
 158   USHORT      window;
 159   USHORT      check;
 160   USHORT      urg_ptr;
 161 } TCPHDR;
 162
 163 #define TCPOPT_EOL     0
 164 #define TCPOPT_NOP     1
 165 #define TCPOPT_MAXSEG  2
 166 #define TCPOLEN_MAXSEG 4
 167
 168 #pragma pack()