Internet on FIRE

/*

 *        BIRD Library -- IPv4 Address Manipulation Functions

 *

 *        (c) 1998 Martin Mares <mj@ucw.cz>

 *

 *        Can be freely distributed and used under the terms of the GNU GPL.

 */

#include "nest/bird.h"

#include "lib/ip.h"

int

ipv4_classify(u32 a)

{

  u32 b = a >> 24U;

  if (b && b <= 0xdf)

    {

      if (b == 0x7f)

        return IADDR_HOST | SCOPE_HOST;

      else

        return IADDR_HOST | SCOPE_UNIVERSE;

    }

  if (b >= 0xe0 && b <= 0xef)

    return IADDR_MULTICAST | SCOPE_UNIVERSE;

  if (a == 0xffffffff)

    return IADDR_BROADCAST | SCOPE_LINK;

  return IADDR_INVALID;

}