1/* $NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $ */ 2/* $KAME: route6.c,v 1.22 2000/12/03 00:54:00 itojun Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 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. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $"); 35 36#include <sys/param.h> 37#include <sys/mbuf.h> 38#include <sys/systm.h> 39 40#include <net/if.h> 41 42#include <netinet/in.h> 43#include <netinet6/in6_var.h> 44#include <netinet/ip6.h> 45#include <netinet6/ip6_var.h> 46#include <netinet6/ip6_private.h> 47 48#include <netinet/icmp6.h> 49 50int 51route6_input(struct mbuf **mp, int *offp, int proto) 52{ 53 struct mbuf *m = *mp; 54 struct ip6_rthdr *rh; 55 int off = *offp, rhlen; 56 57 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 58 if (rh == NULL) { 59 IP6_STATINC(IP6_STAT_TOOSHORT); 60 return IPPROTO_DONE; 61 } 62 63 switch (rh->ip6r_type) { 64 case IPV6_RTHDR_TYPE_0: 65 /* 66 * RFC5095: RH0 must be treated as unrecognized. 67 */ 68 default: 69 /* unknown routing type */ 70 if (rh->ip6r_segleft == 0) { 71 rhlen = (rh->ip6r_len + 1) << 3; 72 break; /* Final dst. Just ignore the header. */ 73 } 74 IP6_STATINC(IP6_STAT_BADOPTIONS); 75 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 76 off + offsetof(struct ip6_rthdr, ip6r_type)); 77 return IPPROTO_DONE; 78 } 79 80 *offp += rhlen; 81 return rh->ip6r_nxt; 82} 83