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#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#include <net/if_var.h>
46
47#include <netinet/in.h>
48#include <netinet6/in6_var.h>
49#include <netinet/ip6.h>
50#include <netinet6/ip6_var.h>
51#include <netinet6/scope6_var.h>
52
53#include <netinet/icmp6.h>
54
55/*
56 * proto - is unused
57 */
58
59int
60route6_input(struct mbuf **mp, int *offp, int proto)
61{
62	struct ip6_hdr *ip6;
63	struct mbuf *m;
64	struct ip6_rthdr *rh;
65	int off = *offp, rhlen;
66#ifdef __notyet__
67	struct ip6aux *ip6a;
68#endif
69
70	m = *mp;
71
72#ifdef __notyet__
73	ip6a = ip6_findaux(m);
74	if (ip6a) {
75		/* XXX reject home-address option before rthdr */
76		if (ip6a->ip6a_flags & IP6A_SWAP) {
77			IP6STAT_INC(ip6s_badoptions);
78			m_freem(m);
79			return IPPROTO_DONE;
80		}
81	}
82#endif
83
84	if (m->m_len < off + sizeof(*rh)) {
85		m = m_pullup(m, off + sizeof(*rh));
86		if (m == NULL) {
87			IP6STAT_INC(ip6s_exthdrtoolong);
88			*mp = NULL;
89			return (IPPROTO_DONE);
90		}
91	}
92	ip6 = mtod(m, struct ip6_hdr *);
93	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
94
95	/*
96	 * While this switch may look gratuitous, leave it in
97	 * in favour of RH2 implementations, etc.
98	 */
99	switch (rh->ip6r_type) {
100	default:
101		/* Unknown routing header type. */
102		if (rh->ip6r_segleft == 0) {
103			rhlen = (rh->ip6r_len + 1) << 3;
104			break;	/* Final dst. Just ignore the header. */
105		}
106		IP6STAT_INC(ip6s_badoptions);
107		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
108			    (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
109		*mp = NULL;
110		return (IPPROTO_DONE);
111	}
112
113	*offp += rhlen;
114	*mp = m;
115	return (rh->ip6r_nxt);
116}
117