FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c
1 /* $OpenBSD: dest6.c,v 1.19 2022/06/29 22:45:24 bluhm Exp $ */
2 /* $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
19 *
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
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/mbuf.h>
36 #include <sys/socket.h>
37 #include <sys/errno.h>
38 #include <sys/time.h>
39 #include <sys/kernel.h>
40
41 #include <netinet/in.h>
42 #include <netinet/ip6.h>
43 #include <netinet6/ip6_var.h>
44 #include <netinet/icmp6.h>
45
46 /*
47 * Destination options header processing.
48 */
49 int
50 dest6_input(struct mbuf **mp, int *offp, int proto, int af)
51 {
52 int off = *offp, dstoptlen, optlen;
53 struct ip6_dest *dstopts;
54 u_int8_t *opt;
55
56 /* validation of the length of the header */
57 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, sizeof(*dstopts));
58 if (dstopts == NULL)
59 return IPPROTO_DONE;
60 dstoptlen = (dstopts->ip6d_len + 1) << 3;
61
62 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, dstoptlen);
63 if (dstopts == NULL)
64 return IPPROTO_DONE;
65 off += dstoptlen;
66 dstoptlen -= sizeof(struct ip6_dest);
67 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
68
69 /* search header for all options. */
70 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
71 if (*opt != IP6OPT_PAD1 &&
72 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
73 ip6stat_inc(ip6s_toosmall);
74 goto bad;
75 }
76
77 switch (*opt) {
78 case IP6OPT_PAD1:
79 optlen = 1;
80 break;
81 case IP6OPT_PADN:
82 optlen = *(opt + 1) + 2;
83 break;
84 default: /* unknown option */
85 optlen = ip6_unknown_opt(mp, opt,
86 opt - mtod(*mp, u_int8_t *));
87 if (optlen == -1)
88 return (IPPROTO_DONE);
89 optlen += 2;
90 break;
91 }
92 }
93
94 *offp = off;
95 return (dstopts->ip6d_nxt);
96
97 bad:
98 m_freemp(mp);
99 return (IPPROTO_DONE);
100 }
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