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