route6.c revision 331722 
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: stable/11/sys/netinet6/route6.c 331722 2018-03-29 02:50:57Z eadler $");
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#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 = *mp;
64	struct ip6_rthdr *rh;
65	int off = *offp, rhlen;
66#ifdef __notyet__
67	struct ip6aux *ip6a;
68
69	ip6a = ip6_findaux(m);
70	if (ip6a) {
71		/* XXX reject home-address option before rthdr */
72		if (ip6a->ip6a_flags & IP6A_SWAP) {
73			IP6STAT_INC(ip6s_badoptions);
74			m_freem(m);
75			return IPPROTO_DONE;
76		}
77	}
78#endif
79
80#ifndef PULLDOWN_TEST
81	IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
82	ip6 = mtod(m, struct ip6_hdr *);
83	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
84#else
85	ip6 = mtod(m, struct ip6_hdr *);
86	IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
87	if (rh == NULL) {
88		IP6STAT_INC(ip6s_tooshort);
89		return IPPROTO_DONE;
90	}
91#endif
92
93	/*
94	 * While this switch may look gratuitous, leave it in
95	 * in favour of RH2 implementations, etc.
96	 */
97	switch (rh->ip6r_type) {
98	default:
99		/* Unknown routing header type. */
100		if (rh->ip6r_segleft == 0) {
101			rhlen = (rh->ip6r_len + 1) << 3;
102			break;	/* Final dst. Just ignore the header. */
103		}
104		IP6STAT_INC(ip6s_badoptions);
105		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
106			    (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
107		return (IPPROTO_DONE);
108	}
109
110	*offp += rhlen;
111	return (rh->ip6r_nxt);
112}
113