lib/libc/net/inet6_scopeid.c

   1 /*-
   2  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Christos Zoulas.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *        This product includes software developed by the NetBSD
  19  *        Foundation, Inc. and its contributors.
  20  * 4. Neither the name of The NetBSD Foundation nor the names of its
  21  *    contributors may be used to endorse or promote products derived
  22  *    from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  28  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36 #include <sys/cdefs.h>
  37 __RCSID("$NetBSD: inet6_scopeid.c,v 1.2 2013/10/19 15:47:02 christos Exp $");
  38
  39 #include <sys/endian.h>
  40 #include <string.h>
  41 #include <stdint.h>
  42 #include <netinet/in.h>
  43 #include <netinet6/in6.h>
  44
  45 /* KAME idiosyncrasy */
  46 void
  47 inet6_getscopeid(struct sockaddr_in6 *sin6, int flags)
  48 {
  49 #if defined(__KAME__)
  50         if ((IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  51             (flags & INET6_IS_ADDR_LINKLOCAL)) ||
  52             (IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr) &&
  53             (flags & INET6_IS_ADDR_MC_LINKLOCAL)) ||
  54             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  55             (flags & INET6_IS_ADDR_SITELOCAL))) {
  56                 uint16_t scope;
  57                 memcpy(&scope, &sin6->sin6_addr.s6_addr[2], sizeof(scope));
  58                 sin6->sin6_scope_id = ntohs(scope);
  59                 sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
  60         }
  61 #endif
  62 }
  63
  64 void
  65 inet6_putscopeid(struct sockaddr_in6 *sin6, int flags)
  66 {
  67 #if defined(__KAME__)
  68         if ((IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
  69             (flags & INET6_IS_ADDR_LINKLOCAL)) ||
  70             (IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr) &&
  71             (flags & INET6_IS_ADDR_MC_LINKLOCAL)) ||
  72             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
  73             (flags & INET6_IS_ADDR_SITELOCAL))) {
  74             uint16_t scope = htons(sin6->sin6_scope_id);
  75                 memcpy(&sin6->sin6_addr.s6_addr[2], &scope, sizeof(scope));
  76                 sin6->sin6_scope_id = 0;
  77         }
  78 #endif
  79 }