1 /* $OpenBSD: route6.c,v 1.22 2024/02/13 12:22:09 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 #include <net/route.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
47 #include <netinet/icmp6.h>
48
49 /*
50 * proto is unused
51 */
52
53 int
route6_input(struct mbuf ** mp,int * offp,int proto,int af)54 route6_input(struct mbuf **mp, int *offp, int proto, int af)
55 {
56 struct ip6_hdr *ip6;
57 struct mbuf *m = *mp;
58 struct ip6_rthdr *rh;
59 int off = *offp, rhlen;
60
61 ip6 = mtod(m, struct ip6_hdr *);
62 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
63 if (rh == NULL) {
64 ip6stat_inc(ip6s_tooshort);
65 return IPPROTO_DONE;
66 }
67
68 switch (rh->ip6r_type) {
69 case IPV6_RTHDR_TYPE_0:
70 /*
71 * RFC 5095 specifies to handle routing header type 0
72 * the same way as an unrecognised routing type.
73 */
74 /* FALLTHROUGH */
75 default:
76 /* unknown routing type */
77 if (rh->ip6r_segleft == 0) {
78 rhlen = (rh->ip6r_len + 1) << 3;
79 break; /* Final dst. Just ignore the header. */
80 }
81 ip6stat_inc(ip6s_badoptions);
82 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
83 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
84 return (IPPROTO_DONE);
85 }
86
87 *offp += rhlen;
88 return (rh->ip6r_nxt);
89 }
90