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
61int
62route6_input(struct mbuf **mp, int *offp, int proto)
63{
64	struct ip6_hdr *ip6;
65	struct mbuf *m;
66	struct ip6_rthdr *rh;
67	int off = *offp, rhlen;
68#ifdef __notyet__
69	struct ip6aux *ip6a;
70#endif
71
72	m = *mp;
73
74#ifdef __notyet__
75	ip6a = ip6_findaux(m);
76	if (ip6a) {
77		/* XXX reject home-address option before rthdr */
78		if (ip6a->ip6a_flags & IP6A_SWAP) {
79			IP6STAT_INC(ip6s_badoptions);
80			m_freem(m);
81			return IPPROTO_DONE;
82		}
83	}
84#endif
85
86	if (m->m_len < off + sizeof(*rh)) {
87		m = m_pullup(m, off + sizeof(*rh));
88		if (m == NULL) {
89			IP6STAT_INC(ip6s_exthdrtoolong);
90			*mp = NULL;
91			return (IPPROTO_DONE);
92		}
93	}
94	ip6 = mtod(m, struct ip6_hdr *);
95	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
96
97	/*
98	 * While this switch may look gratuitous, leave it in
99	 * in favour of RH2 implementations, etc.
100	 */
101	switch (rh->ip6r_type) {
102	default:
103		/* Unknown routing header type. */
104		if (rh->ip6r_segleft == 0) {
105			rhlen = (rh->ip6r_len + 1) << 3;
106			break;	/* Final dst. Just ignore the header. */
107		}
108		IP6STAT_INC(ip6s_badoptions);
109		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
110			    (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
111		*mp = NULL;
112		return (IPPROTO_DONE);
113	}
114
115	*offp += rhlen;
116	*mp = m;
117	return (rh->ip6r_nxt);
118}
119