2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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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
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31 * $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
44 #include <sys/domain.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/errno.h>
49 #include <sys/kernel.h>
52 #include <net/if_var.h>
53 #include <net/route.h>
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/ip6.h>
58 #include <netinet6/ip6_var.h>
59 #include <netinet/icmp6.h>
62 * Destination options header processing.
65 dest6_input(struct mbuf **mp, int *offp, int proto)
68 int off = *offp, dstoptlen, optlen;
69 struct ip6_dest *dstopts;
72 /* validation of the length of the header */
74 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
75 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
77 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
81 dstoptlen = (dstopts->ip6d_len + 1) << 3;
84 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
85 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
87 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
92 dstoptlen -= sizeof(struct ip6_dest);
93 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
95 /* search header for all options. */
96 for (; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
97 if (*opt != IP6OPT_PAD1 &&
98 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
99 IP6STAT_INC(ip6s_toosmall);
108 optlen = *(opt + 1) + 2;
110 default: /* unknown option */
111 optlen = ip6_unknown_opt(opt, m,
112 opt - mtod(m, u_int8_t *));
114 return (IPPROTO_DONE);
121 return (dstopts->ip6d_nxt);
125 return (IPPROTO_DONE);