FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c
1 /* $NetBSD: dest6.c,v 1.15 2006/11/16 01:33:45 christos 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 1.15 2006/11/16 01:33:45 christos Exp $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
44 #include <sys/time.h>
45 #include <sys/kernel.h>
46
47 #include <net/if.h>
48 #include <net/route.h>
49
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>
55
56 /*
57 * Destination options header processing.
58 */
59 int
60 dest6_input(struct mbuf **mp, int *offp, int proto)
61 {
62 struct mbuf *m = *mp;
63 int off = *offp, dstoptlen, optlen;
64 struct ip6_dest *dstopts;
65 u_int8_t *opt;
66
67 /* validation of the length of the header */
68 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
69 if (dstopts == NULL)
70 return IPPROTO_DONE;
71 dstoptlen = (dstopts->ip6d_len + 1) << 3;
72
73 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
74 if (dstopts == NULL)
75 return IPPROTO_DONE;
76 off += dstoptlen;
77 dstoptlen -= sizeof(struct ip6_dest);
78 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
79
80 /* search header for all options. */
81 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
82 if (*opt != IP6OPT_PAD1 &&
83 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
84 ip6stat.ip6s_toosmall++;
85 goto bad;
86 }
87
88 switch (*opt) {
89 case IP6OPT_PAD1:
90 optlen = 1;
91 break;
92 case IP6OPT_PADN:
93 optlen = *(opt + 1) + 2;
94 break;
95 default: /* unknown option */
96 optlen = ip6_unknown_opt(opt, m,
97 opt - mtod(m, u_int8_t *));
98 if (optlen == -1)
99 return (IPPROTO_DONE);
100 optlen += 2;
101 break;
102 }
103 }
104
105 *offp = off;
106 return (dstopts->ip6d_nxt);
107
108 bad:
109 m_freem(m);
110 return (IPPROTO_DONE);
111 }
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