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
59 int
route6_input(struct mbuf ** mp,int * offp,int proto)60 route6_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