2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
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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.
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
42 #include <sys/socket.h>
43 #include <sys/systm.h>
44 #include <sys/queue.h>
47 #include <net/if_var.h>
49 #include <netinet/in.h>
50 #include <netinet6/in6_var.h>
51 #include <netinet/ip6.h>
52 #include <netinet6/ip6_var.h>
53 #include <netinet6/scope6_var.h>
55 #include <netinet/icmp6.h>
62 route6_input(struct mbuf **mp, int *offp, int proto)
67 int off = *offp, rhlen;
75 ip6a = ip6_findaux(m);
77 /* XXX reject home-address option before rthdr */
78 if (ip6a->ip6a_flags & IP6A_SWAP) {
79 IP6STAT_INC(ip6s_badoptions);
86 if (m->m_len < off + sizeof(*rh)) {
87 m = m_pullup(m, off + sizeof(*rh));
89 IP6STAT_INC(ip6s_exthdrtoolong);
91 return (IPPROTO_DONE);
94 ip6 = mtod(m, struct ip6_hdr *);
95 rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
98 * While this switch may look gratuitous, leave it in
99 * in favour of RH2 implementations, etc.
101 switch (rh->ip6r_type) {
103 /* Unknown routing header type. */
104 if (rh->ip6r_segleft == 0) {
105 rhlen = (rh->ip6r_len + 1) << 3;
106 break; /* Final dst. Just ignore the header. */
108 IP6STAT_INC(ip6s_badoptions);
109 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
110 (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
112 return (IPPROTO_DONE);
117 return (rh->ip6r_nxt);