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: releng/10.3/sys/netinet6/route6.c 249294 2013-04-09 07:11:22Z ae $");
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
58int
59route6_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#ifdef __notyet__
66	struct ip6aux *ip6a;
67
68	ip6a = ip6_findaux(m);
69	if (ip6a) {
70		/* XXX reject home-address option before rthdr */
71		if (ip6a->ip6a_flags & IP6A_SWAP) {
72			IP6STAT_INC(ip6s_badoptions);
73			m_freem(m);
74			return IPPROTO_DONE;
75		}
76	}
77#endif
78
79#ifndef PULLDOWN_TEST
80	IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
81	ip6 = mtod(m, struct ip6_hdr *);
82	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
83#else
84	ip6 = mtod(m, struct ip6_hdr *);
85	IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
86	if (rh == NULL) {
87		IP6STAT_INC(ip6s_tooshort);
88		return IPPROTO_DONE;
89	}
90#endif
91
92	/*
93	 * While this switch may look gratuitous, leave it in
94	 * in favour of RH2 implementations, etc.
95	 */
96	switch (rh->ip6r_type) {
97	default:
98		/* Unknown routing header type. */
99		if (rh->ip6r_segleft == 0) {
100			rhlen = (rh->ip6r_len + 1) << 3;
101			break;	/* Final dst. Just ignore the header. */
102		}
103		IP6STAT_INC(ip6s_badoptions);
104		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
105			    (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
106		return (IPPROTO_DONE);
107	}
108
109	*offp += rhlen;
110	return (rh->ip6r_nxt);
111}
112