1 /* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.4 2002/04/28 05:40:26 suz Exp $ */
2 /* $KAME: dest6.c,v 1.34 2002/01/08 02:40:55 k-sugyou Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
34 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
45 #include <sys/kernel.h>
48 #include <net/route.h>
50 #include <netinet/in.h>
51 #include <netinet/in_var.h>
52 #include <netinet/ip6.h>
53 #include <netinet6/ip6_var.h>
54 #include <netinet/icmp6.h>
57 * Destination options header processing.
60 dest6_input(struct mbuf **mp, int *offp, int proto)
63 int off = *offp, dstoptlen, optlen;
64 struct ip6_dest *dstopts;
67 /* validation of the length of the header */
69 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
70 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
72 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
76 dstoptlen = (dstopts->ip6d_len + 1) << 3;
79 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
80 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
82 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
87 dstoptlen -= sizeof(struct ip6_dest);
88 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
90 /* search header for all options. */
91 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
92 if (*opt != IP6OPT_PAD1 &&
93 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
94 ip6stat.ip6s_toosmall++;
103 optlen = *(opt + 1) + 2;
106 default: /* unknown option */
107 optlen = ip6_unknown_opt(opt, m,
108 opt - mtod(m, u_int8_t *));
110 return (IPPROTO_DONE);
117 return (dstopts->ip6d_nxt);
121 return (IPPROTO_DONE);