FreeBSD/Linux Kernel Cross Reference
sys/netinet6/route6.c
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
50 int
51 route6_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 }
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