1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/mbuf.h> 42 #include <sys/socket.h> 43 #include <sys/systm.h> 44 #include <sys/queue.h> 45 46 #include <net/if.h> 47 #include <net/if_var.h> 48 49 #include <netinet/in.h> 50 #include <netinet6/in6_var.h> 51 #include <netinet/ip6.h> 52 #include <netinet6/ip6_var.h> 53 #include <netinet6/scope6_var.h> 54 55 #include <netinet/icmp6.h> 56 57 /* 58 * proto - is unused 59 */ 60 61 int 62 route6_input(struct mbuf **mp, int *offp, int proto) 63 { 64 struct ip6_hdr *ip6; 65 struct mbuf *m = *mp; 66 struct ip6_rthdr *rh; 67 int off = *offp, rhlen; 68 #ifdef __notyet__ 69 struct ip6aux *ip6a; 70 71 ip6a = ip6_findaux(m); 72 if (ip6a) { 73 /* XXX reject home-address option before rthdr */ 74 if (ip6a->ip6a_flags & IP6A_SWAP) { 75 IP6STAT_INC(ip6s_badoptions); 76 m_freem(m); 77 return IPPROTO_DONE; 78 } 79 } 80 #endif 81 82 #ifndef PULLDOWN_TEST 83 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); 84 ip6 = mtod(m, struct ip6_hdr *); 85 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); 86 #else 87 ip6 = mtod(m, struct ip6_hdr *); 88 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 89 if (rh == NULL) { 90 IP6STAT_INC(ip6s_tooshort); 91 return IPPROTO_DONE; 92 } 93 #endif 94 95 /* 96 * While this switch may look gratuitous, leave it in 97 * in favour of RH2 implementations, etc. 98 */ 99 switch (rh->ip6r_type) { 100 default: 101 /* Unknown routing header type. */ 102 if (rh->ip6r_segleft == 0) { 103 rhlen = (rh->ip6r_len + 1) << 3; 104 break; /* Final dst. Just ignore the header. */ 105 } 106 IP6STAT_INC(ip6s_badoptions); 107 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 108 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 109 return (IPPROTO_DONE); 110 } 111 112 *offp += rhlen; 113 return (rh->ip6r_nxt); 114 } 115