xref: /src/lib/libc/net/inet6_scopeid.c

/*-
 * Copyright (c) 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#include <sys/cdefs.h>
__RCSID("$NetBSD: inet6_scopeid.c,v 1.3 2015/12/14 03:49:54 ozaki-r Exp $");

#include <sys/endian.h>
#include <string.h>
#include <stdint.h>
#include <netinet/in.h>
#include <netinet6/in6.h>

/* KAME idiosyncrasy */
void
inet6_getscopeid(struct sockaddr_in6 *sin6, int flags)
{
#if defined(__KAME__)
	if ((IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_LINKLOCAL)) ||
	    (IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_MC_LINKLOCAL)) ||
	    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_SITELOCAL))) {
		uint16_t scope;
		memcpy(&scope, &sin6->sin6_addr.s6_addr[2], sizeof(scope));
		sin6->sin6_scope_id = ntohs(scope);
		sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
	}
#endif
}

void
inet6_putscopeid(struct sockaddr_in6 *sin6, int flags)
{
#if defined(__KAME__)
	if ((IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_LINKLOCAL)) ||
	    (IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_MC_LINKLOCAL)) ||
	    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
	    (flags & INET6_IS_ADDR_SITELOCAL))) {
		uint16_t scope = htons(sin6->sin6_scope_id);
		memcpy(&sin6->sin6_addr.s6_addr[2], &scope, sizeof(scope));
		sin6->sin6_scope_id = 0;
	}
#endif
}