release/src/router/openvpn/tap-win32/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).
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program (see the file COPYING included with this
  21  *  distribution); if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 //============================================================
  26 // MAC address, Ethernet header, and ARP
  27 //============================================================
  28
  29 #pragma pack(1)
  30
  31 #define IP_HEADER_SIZE 20
  32
  33 typedef unsigned char MACADDR [6];
  34 typedef unsigned long IPADDR;
  35
  36 //-----------------
  37 // Ethernet address
  38 //-----------------
  39
  40 typedef struct {
  41   MACADDR addr;
  42 } ETH_ADDR;
  43
  44 typedef struct {
  45   ETH_ADDR list[NIC_MAX_MCAST_LIST];
  46 } MC_LIST;
  47
  48 //----------------
  49 // Ethernet header
  50 //----------------
  51
  52 typedef struct
  53 {
  54   MACADDR dest;               /* destination eth addr   */
  55   MACADDR src;                /* source ether addr      */
  56
  57 # define ETH_P_IP   0x0800    /* IPv4 protocol */
  58 # define ETH_P_ARP  0x0806    /* ARP protocol */
  59   USHORT proto;               /* packet type ID field   */
  60 } ETH_HEADER, *PETH_HEADER;
  61
  62 //----------------
  63 // ARP packet
  64 //----------------
  65
  66 typedef struct
  67    {
  68     MACADDR        m_MAC_Destination;        // Reverse these two
  69     MACADDR        m_MAC_Source;             // to answer ARP requests
  70     USHORT         m_Proto;                  // 0x0806
  71
  72 #   define MAC_ADDR_TYPE 0x0001
  73     USHORT         m_MAC_AddressType;        // 0x0001
  74
  75     USHORT         m_PROTO_AddressType;      // 0x0800
  76     UCHAR          m_MAC_AddressSize;        // 0x06
  77     UCHAR          m_PROTO_AddressSize;      // 0x04
  78
  79 #   define ARP_REQUEST 0x0001
  80 #   define ARP_REPLY   0x0002
  81     USHORT         m_ARP_Operation;          // 0x0001 for ARP request, 0x0002 for ARP reply
  82
  83     MACADDR        m_ARP_MAC_Source;
  84     IPADDR         m_ARP_IP_Source;
  85     MACADDR        m_ARP_MAC_Destination;
  86     IPADDR         m_ARP_IP_Destination;
  87    }
  88 ARP_PACKET, *PARP_PACKET;
  89
  90 //----------
  91 // IP Header
  92 //----------
  93
  94 typedef struct {
  95 # define IPH_GET_VER(v) (((v) >> 4) & 0x0F)
  96 # define IPH_GET_LEN(v) (((v) & 0x0F) << 2)
  97   UCHAR    version_len;
  98
  99   UCHAR    tos;
 100   USHORT   tot_len;
 101   USHORT   id;
 102
 103 # define IP_OFFMASK 0x1fff
 104   USHORT   frag_off;
 105
 106   UCHAR    ttl;
 107
 108 # define IPPROTO_UDP  17  /* UDP protocol */
 109 # define IPPROTO_TCP   6  /* TCP protocol */
 110 # define IPPROTO_ICMP  1  /* ICMP protocol */
 111 # define IPPROTO_IGMP  2  /* IGMP protocol */
 112   UCHAR    protocol;
 113
 114   USHORT   check;
 115   ULONG    saddr;
 116   ULONG    daddr;
 117   /* The options start here. */
 118 } IPHDR;
 119
 120 //-----------
 121 // UDP header
 122 //-----------
 123
 124 typedef struct {
 125   USHORT   source;
 126   USHORT   dest;
 127   USHORT   len;
 128   USHORT   check;
 129 } UDPHDR;
 130
 131 //--------------------------
 132 // TCP header, per RFC 793.
 133 //--------------------------
 134
 135 typedef struct {
 136   USHORT      source;    /* source port */
 137   USHORT      dest;      /* destination port */
 138   ULONG       seq;       /* sequence number */
 139   ULONG       ack_seq;   /* acknowledgement number */
 140
 141 # define TCPH_GET_DOFF(d) (((d) & 0xF0) >> 2)
 142   UCHAR       doff_res;
 143
 144 # define TCPH_FIN_MASK (1<<0)
 145 # define TCPH_SYN_MASK (1<<1)
 146 # define TCPH_RST_MASK (1<<2)
 147 # define TCPH_PSH_MASK (1<<3)
 148 # define TCPH_ACK_MASK (1<<4)
 149 # define TCPH_URG_MASK (1<<5)
 150 # define TCPH_ECE_MASK (1<<6)
 151 # define TCPH_CWR_MASK (1<<7)
 152   UCHAR       flags;
 153
 154   USHORT      window;
 155   USHORT      check;
 156   USHORT      urg_ptr;
 157 } TCPHDR;
 158
 159 #define TCPOPT_EOL     0
 160 #define TCPOPT_NOP     1
 161 #define TCPOPT_MAXSEG  2
 162 #define TCPOLEN_MAXSEG 4
 163
 164 #pragma pack()