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ipv6_conv.c

/* Distributed Checksum Clearinghouse
 *
 * Copyright (c) 2005 by Rhyolite Software
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND RHYOLITE SOFTWARE DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RHYOLITE SOFTWARE
 * BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 *
 * Rhyolite Software DCC 1.2.74-1.10 $Revision$
 */

#include "dcc_defs.h"


/* convert IPv4 address to IPv6 */
void
dcc_ipv4toipv6(struct in6_addr *dst, const struct in_addr src)
{
      /* do it in an order that allows dst==src */
      dst->s6_addr32[3] = src.s_addr;
      dst->s6_addr32[0] = 0;
      dst->s6_addr32[1] = 0;
      dst->s6_addr32[2] = htonl(0xffff);
}



/* try to convert IPv6 address to IPv4 */
u_char                              /* 1=did it */
dcc_ipv6toipv4(struct in_addr *dst, const struct in6_addr *src)
{
      if (DCC_IN6_ADDR_V4MAPPED(src)) {
            dst->s_addr = src->s6_addr32[3];
            return 1;
      }

      if (src->s6_addr32[0] != 0
          || src->s6_addr32[1] != 0
          || src->s6_addr32[2] != 0)
            return 0;

      if (src->s6_addr32[3] == ntohl(1))
            dst->s_addr = ntohl(0x7f000001);
      else
            dst->s_addr = src->s6_addr32[3];
      return 1;
}

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