2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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29 * $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/domain.h>
43 #include <sys/protosw.h>
44 #include <sys/socket.h>
45 #include <sys/errno.h>
47 #include <sys/kernel.h>
50 #include <net/if_var.h>
51 #include <net/route.h>
53 #include <netinet/in.h>
54 #include <netinet/in_var.h>
55 #include <netinet/ip6.h>
56 #include <netinet6/ip6_var.h>
57 #include <netinet/icmp6.h>
60 * Destination options header processing.
63 dest6_input(struct mbuf **mp, int *offp, int proto)
66 int off = *offp, dstoptlen, optlen;
67 struct ip6_dest *dstopts;
70 /* validation of the length of the header */
72 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
73 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
75 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
79 dstoptlen = (dstopts->ip6d_len + 1) << 3;
82 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
83 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
85 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
90 dstoptlen -= sizeof(struct ip6_dest);
91 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
93 /* search header for all options. */
94 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
95 if (*opt != IP6OPT_PAD1 &&
96 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
97 IP6STAT_INC(ip6s_toosmall);
106 optlen = *(opt + 1) + 2;
108 default: /* unknown option */
109 optlen = ip6_unknown_opt(opt, m,
110 opt - mtod(m, u_int8_t *));
112 return (IPPROTO_DONE);
119 return (dstopts->ip6d_nxt);
123 return (IPPROTO_DONE);