1 | /* |
2 | * Copyright (c) 2020 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */ |
29 | /* $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $ */ |
30 | |
31 | /* |
32 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
33 | * All rights reserved. |
34 | * |
35 | * Redistribution and use in source and binary forms, with or without |
36 | * modification, are permitted provided that the following conditions |
37 | * are met: |
38 | * 1. Redistributions of source code must retain the above copyright |
39 | * notice, this list of conditions and the following disclaimer. |
40 | * 2. Redistributions in binary form must reproduce the above copyright |
41 | * notice, this list of conditions and the following disclaimer in the |
42 | * documentation and/or other materials provided with the distribution. |
43 | * 3. Neither the name of the project nor the names of its contributors |
44 | * may be used to endorse or promote products derived from this software |
45 | * without specific prior written permission. |
46 | * |
47 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
48 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
49 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
50 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
51 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
52 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
53 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
54 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
55 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
56 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
57 | * SUCH DAMAGE. |
58 | */ |
59 | |
60 | #include <sys/param.h> |
61 | #include <sys/systm.h> |
62 | #include <sys/malloc.h> |
63 | #include <sys/mbuf.h> |
64 | #include <sys/domain.h> |
65 | #include <sys/protosw.h> |
66 | #include <sys/socket.h> |
67 | #include <sys/errno.h> |
68 | #include <sys/time.h> |
69 | #include <sys/kernel.h> |
70 | |
71 | #include <net/if.h> |
72 | #include <net/route.h> |
73 | |
74 | #include <netinet/in.h> |
75 | #include <netinet/in_var.h> |
76 | #include <netinet/ip6.h> |
77 | #include <netinet6/ip6_var.h> |
78 | #include <netinet/icmp6.h> |
79 | |
80 | /* |
81 | * Destination options header processing. |
82 | */ |
83 | int |
84 | dest6_input(struct mbuf **mp, int *offp, int proto) |
85 | { |
86 | #pragma unused(proto) |
87 | struct mbuf *m = *mp; |
88 | int off = *offp, dstoptlen = 0, optlen = 0; |
89 | struct ip6_dest *dstopts = NULL; |
90 | u_int8_t *opt = NULL; |
91 | |
92 | /* validation of the length of the header */ |
93 | IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE); |
94 | dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); |
95 | dstoptlen = (dstopts->ip6d_len + 1) << 3; |
96 | |
97 | IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE); |
98 | dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); |
99 | off += dstoptlen; |
100 | dstoptlen -= sizeof(struct ip6_dest); |
101 | opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); |
102 | |
103 | /* search header for all options. */ |
104 | for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { |
105 | if (*opt != IP6OPT_PAD1 && |
106 | (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { |
107 | ip6stat.ip6s_toosmall++; |
108 | goto bad; |
109 | } |
110 | |
111 | switch (*opt) { |
112 | case IP6OPT_PAD1: |
113 | optlen = 1; |
114 | break; |
115 | case IP6OPT_PADN: |
116 | optlen = *(opt + 1) + 2; |
117 | break; |
118 | |
119 | default: /* unknown option */ |
120 | optlen = ip6_unknown_opt(opt, m, |
121 | opt - mtod(m, u_int8_t *)); |
122 | if (optlen == -1) { |
123 | return IPPROTO_DONE; |
124 | } |
125 | optlen += 2; |
126 | break; |
127 | } |
128 | } |
129 | *mp = m; |
130 | *offp = off; |
131 | return dstopts->ip6d_nxt; |
132 | |
133 | bad: |
134 | *mp = NULL; |
135 | m_freem(m); |
136 | return IPPROTO_DONE; |
137 | } |
138 | |