1 | /* $NetBSD: dest6.c,v 1.19 2016/04/26 08:44:45 ozaki-r 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 1.19 2016/04/26 08:44:45 ozaki-r Exp $" ); |
35 | |
36 | #include <sys/param.h> |
37 | #include <sys/systm.h> |
38 | #include <sys/mbuf.h> |
39 | #include <sys/domain.h> |
40 | #include <sys/protosw.h> |
41 | #include <sys/socket.h> |
42 | #include <sys/errno.h> |
43 | #include <sys/time.h> |
44 | #include <sys/kernel.h> |
45 | |
46 | #include <net/if.h> |
47 | |
48 | #include <netinet/in.h> |
49 | #include <netinet/in_var.h> |
50 | #include <netinet/ip6.h> |
51 | #include <netinet6/ip6_var.h> |
52 | #include <netinet6/ip6_private.h> |
53 | #include <netinet/icmp6.h> |
54 | |
55 | /* |
56 | * Destination options header processing. |
57 | */ |
58 | int |
59 | dest6_input(struct mbuf **mp, int *offp, int proto) |
60 | { |
61 | struct mbuf *m = *mp; |
62 | int off = *offp, dstoptlen, optlen; |
63 | struct ip6_dest *dstopts; |
64 | u_int8_t *opt; |
65 | |
66 | /* validation of the length of the header */ |
67 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); |
68 | if (dstopts == NULL) |
69 | return IPPROTO_DONE; |
70 | dstoptlen = (dstopts->ip6d_len + 1) << 3; |
71 | |
72 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); |
73 | if (dstopts == NULL) |
74 | return IPPROTO_DONE; |
75 | off += dstoptlen; |
76 | dstoptlen -= sizeof(struct ip6_dest); |
77 | opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); |
78 | |
79 | /* search header for all options. */ |
80 | for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { |
81 | if (*opt != IP6OPT_PAD1 && |
82 | (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { |
83 | IP6_STATINC(IP6_STAT_TOOSMALL); |
84 | goto bad; |
85 | } |
86 | |
87 | switch (*opt) { |
88 | case IP6OPT_PAD1: |
89 | optlen = 1; |
90 | break; |
91 | case IP6OPT_PADN: |
92 | optlen = *(opt + 1) + 2; |
93 | break; |
94 | default: /* unknown option */ |
95 | optlen = ip6_unknown_opt(opt, m, |
96 | opt - mtod(m, u_int8_t *)); |
97 | if (optlen == -1) |
98 | return (IPPROTO_DONE); |
99 | optlen += 2; |
100 | break; |
101 | } |
102 | } |
103 | |
104 | *offp = off; |
105 | return (dstopts->ip6d_nxt); |
106 | |
107 | bad: |
108 | m_freem(m); |
109 | return (IPPROTO_DONE); |
110 | } |
111 | |