1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/systm.h> 42 #include <sys/queue.h> 43 44 #include <net/if.h> 45 46 #include <netinet/in.h> 47 #include <netinet6/in6_var.h> 48 #include <netinet/ip6.h> 49 #include <netinet6/ip6_var.h> 50 #include <netinet6/scope6_var.h> 51 52 #include <netinet/icmp6.h> 53 54 /* 55 * proto - is unused 56 */ 57 58 int 59 route6_input(struct mbuf **mp, int *offp, int proto) 60 { 61 struct ip6_hdr *ip6; 62 struct mbuf *m = *mp; 63 struct ip6_rthdr *rh; 64 int off = *offp, rhlen; 65 #ifdef __notyet__ 66 struct ip6aux *ip6a; 67 68 ip6a = ip6_findaux(m); 69 if (ip6a) { 70 /* XXX reject home-address option before rthdr */ 71 if (ip6a->ip6a_flags & IP6A_SWAP) { 72 V_ip6stat.ip6s_badoptions++; 73 m_freem(m); 74 return IPPROTO_DONE; 75 } 76 } 77 #endif 78 79 #ifndef PULLDOWN_TEST 80 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); 81 ip6 = mtod(m, struct ip6_hdr *); 82 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); 83 #else 84 ip6 = mtod(m, struct ip6_hdr *); 85 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 86 if (rh == NULL) { 87 V_ip6stat.ip6s_tooshort++; 88 return IPPROTO_DONE; 89 } 90 #endif 91 92 /* 93 * While this switch may look gratuitous, leave it in 94 * in favour of RH2 implementations, etc. 95 */ 96 switch (rh->ip6r_type) { 97 default: 98 /* Unknown routing header type. */ 99 if (rh->ip6r_segleft == 0) { 100 rhlen = (rh->ip6r_len + 1) << 3; 101 break; /* Final dst. Just ignore the header. */ 102 } 103 V_ip6stat.ip6s_badoptions++; 104 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 105 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 106 return (IPPROTO_DONE); 107 } 108 109 *offp += rhlen; 110 return (rh->ip6r_nxt); 111 } 112