1/*	$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv 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/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $");
35
36#include <sys/param.h>
37#include <sys/mbuf.h>
38#include <sys/systm.h>
39
40#include <net/if.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#include <netinet6/ip6_private.h>
47
48#include <netinet/icmp6.h>
49
50int
51route6_input(struct mbuf **mp, int *offp, int proto)
52{
53	struct mbuf *m = *mp;
54	struct ip6_rthdr *rh;
55	int off = *offp, rhlen;
56
57	IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
58	if (rh == NULL) {
59		IP6_STATINC(IP6_STAT_TOOSHORT);
60		return IPPROTO_DONE;
61	}
62
63	switch (rh->ip6r_type) {
64	case IPV6_RTHDR_TYPE_0:
65		/*
66		 * RFC5095: RH0 must be treated as unrecognized.
67		 */
68	default:
69		/* unknown routing type */
70		if (rh->ip6r_segleft == 0) {
71			rhlen = (rh->ip6r_len + 1) << 3;
72			break;	/* Final dst. Just ignore the header. */
73		}
74		IP6_STATINC(IP6_STAT_BADOPTIONS);
75		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
76		    off + offsetof(struct ip6_rthdr, ip6r_type));
77		return IPPROTO_DONE;
78	}
79
80	*offp += rhlen;
81	return rh->ip6r_nxt;
82}
83