1 /* $OpenBSD: route6.c,v 1.21 2017/04/14 20:46:31 bluhm 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/param.h> 34 #include <sys/mbuf.h> 35 #include <sys/socket.h> 36 #include <sys/systm.h> 37 38 #include <net/if.h> 39 #include <net/if_var.h> 40 41 #include <netinet/in.h> 42 #include <netinet6/in6_var.h> 43 #include <netinet/ip6.h> 44 #include <netinet6/ip6_var.h> 45 46 #include <netinet/icmp6.h> 47 48 /* 49 * proto is unused 50 */ 51 52 int 53 route6_input(struct mbuf **mp, int *offp, int proto, int af) 54 { 55 struct ip6_hdr *ip6; 56 struct mbuf *m = *mp; 57 struct ip6_rthdr *rh; 58 int off = *offp, rhlen; 59 60 ip6 = mtod(m, struct ip6_hdr *); 61 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 62 if (rh == NULL) { 63 ip6stat_inc(ip6s_tooshort); 64 return IPPROTO_DONE; 65 } 66 67 switch (rh->ip6r_type) { 68 case IPV6_RTHDR_TYPE_0: 69 /* 70 * RFC 5095 specifies to handle routing header type 0 71 * the same way as an unrecognised routing type. 72 */ 73 /* FALLTHROUGH */ 74 default: 75 /* unknown routing type */ 76 if (rh->ip6r_segleft == 0) { 77 rhlen = (rh->ip6r_len + 1) << 3; 78 break; /* Final dst. Just ignore the header. */ 79 } 80 ip6stat_inc(ip6s_badoptions); 81 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 82 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 83 return (IPPROTO_DONE); 84 } 85 86 *offp += rhlen; 87 return (rh->ip6r_nxt); 88 } 89