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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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.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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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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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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>
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, dstoptlen, optlen;
67 struct ip6_dest *dstopts;
73 /* Validation of the length of the header. */
74 if (m->m_len < off + sizeof(*dstopts)) {
75 m = m_pullup(m, off + sizeof(*dstopts));
77 IP6STAT_INC(ip6s_exthdrtoolong);
79 return (IPPROTO_DONE);
82 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
83 dstoptlen = (dstopts->ip6d_len + 1) << 3;
85 if (m->m_len < off + dstoptlen) {
86 m = m_pullup(m, off + dstoptlen);
88 IP6STAT_INC(ip6s_exthdrtoolong);
90 return (IPPROTO_DONE);
93 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
95 dstoptlen -= sizeof(struct ip6_dest);
96 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
98 /* search header for all options. */
99 for (; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
100 if (*opt != IP6OPT_PAD1 &&
101 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
102 IP6STAT_INC(ip6s_toosmall);
111 optlen = *(opt + 1) + 2;
113 default: /* unknown option */
114 optlen = ip6_unknown_opt(opt, m,
115 opt - mtod(m, u_int8_t *));
118 return (IPPROTO_DONE);
127 return (dstopts->ip6d_nxt);
132 return (IPPROTO_DONE);