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 struct ip6aux *ip6a; 66 67 ip6a = ip6_findaux(m); 68 if (ip6a) { 69 /* XXX reject home-address option before rthdr */ 70 if (ip6a->ip6a_flags & IP6A_SWAP) { 71 V_ip6stat.ip6s_badoptions++; 72 m_freem(m); 73 return IPPROTO_DONE; 74 } 75 } 76 77 #ifndef PULLDOWN_TEST 78 IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); 79 ip6 = mtod(m, struct ip6_hdr *); 80 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); 81 #else 82 ip6 = mtod(m, struct ip6_hdr *); 83 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 84 if (rh == NULL) { 85 V_ip6stat.ip6s_tooshort++; 86 return IPPROTO_DONE; 87 } 88 #endif 89 90 /* 91 * While this switch may look gratuitous, leave it in 92 * in favour of RH2 implementations, etc. 93 */ 94 switch (rh->ip6r_type) { 95 default: 96 /* Unknown routing header type. */ 97 if (rh->ip6r_segleft == 0) { 98 rhlen = (rh->ip6r_len + 1) << 3; 99 break; /* Final dst. Just ignore the header. */ 100 } 101 V_ip6stat.ip6s_badoptions++; 102 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 103 (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 104 return (IPPROTO_DONE); 105 } 106 107 *offp += rhlen; 108 return (rh->ip6r_nxt); 109 } 110