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      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 1.3 2015/12/14 03:49:54 ozaki-r 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 }
     80