include/wipal/proto/ip4.hh

/*
 * WiPal - A library and a set of tools to manipulate wireless traces.
 * Copyright (C) 2009  Universite Pierre et Marie Curie - Paris 6
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301  USA
 *
 * Author: Thomas Claveirole <thomas.claveirole@lip6.fr>
 */
#ifndef PROTO_IP4_HH_
# define PROTO_IP4_HH_

extern "C"
{
# include <inttypes.h>
}

# include <wipal/tool/addr.hh>

namespace wpl
{

  namespace ip4
  {

    typedef tool::addr<uint8_t, 4, false, '.'>  addr;

    namespace proto
    {

      enum proto
        {
          ICMP  = 1,
          TCP   = 6,
          UDP   = 17,
          ICMPv6        = 58
        };

    } // End of namespace ip4::proto.

    struct header
    {
      enum addr_index
        {
          sa    = 0,    
          da    = 1,    
        };

      union
      {
        // Use a bitmask to retrieve the 4 first or last bits.
        uint8_t version;
        uint8_t headerlength;
      };

      uint8_t   dsfield;
      uint16_t  iplen;
      uint16_t  identifier;

      union
      {
        // Use a bitmask to retrieve the 3 first or 13 last bits.
        uint16_t        flags;
        uint16_t        fragoffset;
      };

      uint8_t   ttl;
      uint8_t   ipproto;
      uint16_t  checksum;
      addr      addrs[2];

    } __attribute__((__packed__));

  } // End of namespace wpl::ip4.

} // End of namespace wpl.

#endif // ! PROTO_IP4_HH_

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