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
inet6_getscopeid(struct sockaddr_in6 * sin6,int flags)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
inet6_putscopeid(struct sockaddr_in6 * sin6,int flags)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