FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c
1 /* $NetBSD: dest6.c,v 1.22 2018/04/13 11:01:14 maxv 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/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.22 2018/04/13 11:01:14 maxv Exp $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/mbuf.h>
39 #include <sys/errno.h>
40 #include <sys/time.h>
41 #include <sys/kernel.h>
42
43 #include <net/if.h>
44
45 #include <netinet/in.h>
46 #include <netinet/in_var.h>
47 #include <netinet/ip6.h>
48 #include <netinet6/ip6_var.h>
49 #include <netinet6/ip6_private.h>
50 #include <netinet/icmp6.h>
51
52 /*
53 * Destination options header processing.
54 */
55 int
56 dest6_input(struct mbuf **mp, int *offp, int proto)
57 {
58 struct mbuf *m = *mp;
59 int off = *offp, erroff, dstoptlen, optlen;
60 struct ip6_dest *dstopts;
61 u_int8_t *opt;
62
63 /* validation of the length of the header */
64 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
65 if (dstopts == NULL)
66 return IPPROTO_DONE;
67 dstoptlen = (dstopts->ip6d_len + 1) << 3;
68
69 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
70 if (dstopts == NULL)
71 return IPPROTO_DONE;
72 off += dstoptlen;
73 dstoptlen -= sizeof(struct ip6_dest);
74 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
75
76 /* search header for all options. */
77 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
78 if (*opt != IP6OPT_PAD1 &&
79 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
80 IP6_STATINC(IP6_STAT_TOOSMALL);
81 goto bad;
82 }
83
84 switch (*opt) {
85 case IP6OPT_PAD1:
86 optlen = 1;
87 break;
88 case IP6OPT_PADN:
89 optlen = *(opt + 1) + 2;
90 break;
91 default: /* unknown option */
92 erroff = *offp + (opt - (u_int8_t *)dstopts);
93 optlen = ip6_unknown_opt(opt, m, erroff);
94 if (optlen == -1)
95 return IPPROTO_DONE;
96 optlen += 2;
97 break;
98 }
99 }
100
101 *offp = off;
102 return dstopts->ip6d_nxt;
103
104 bad:
105 m_freem(m);
106 return IPPROTO_DONE;
107 }
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