File: | netinet6/dest6.c |
Warning: | line 73, column 7 Value stored to 'optlen' is never read |
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1 | /* $OpenBSD: dest6.c,v 1.17 2017/04/14 20:46:31 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/domain.h> |
37 | #include <sys/protosw.h> |
38 | #include <sys/socket.h> |
39 | #include <sys/errno.h> |
40 | #include <sys/time.h> |
41 | #include <sys/kernel.h> |
42 | |
43 | #include <netinet/in.h> |
44 | #include <netinet/ip6.h> |
45 | #include <netinet6/ip6_var.h> |
46 | #include <netinet/icmp6.h> |
47 | |
48 | /* |
49 | * Destination options header processing. |
50 | */ |
51 | int |
52 | dest6_input(struct mbuf **mp, int *offp, int proto, int af) |
53 | { |
54 | struct mbuf *m = *mp; |
55 | int off = *offp, dstoptlen, optlen; |
56 | struct ip6_dest *dstopts; |
57 | u_int8_t *opt; |
58 | |
59 | /* validation of the length of the header */ |
60 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts))do { struct mbuf *t; int tmp; if ((m)->m_hdr.mh_len >= ( off) + (sizeof(*dstopts))) (dstopts) = (struct ip6_dest *)((( caddr_t)(((m))->m_hdr.mh_data)) + (off)); else { t = m_pulldown ((m), (off), (sizeof(*dstopts)), &tmp); if (t) { if (t-> m_hdr.mh_len < tmp + (sizeof(*dstopts))) panic("m_pulldown malfunction" ); (dstopts) = (struct ip6_dest *)(((caddr_t)((t)->m_hdr.mh_data )) + tmp); } else { (dstopts) = (struct ip6_dest *)((void *)0 ); (m) = ((void *)0); } } } while ( 0); |
61 | if (dstopts == NULL((void *)0)) |
62 | return IPPROTO_DONE257; |
63 | dstoptlen = (dstopts->ip6d_len + 1) << 3; |
64 | |
65 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen)do { struct mbuf *t; int tmp; if ((m)->m_hdr.mh_len >= ( off) + (dstoptlen)) (dstopts) = (struct ip6_dest *)(((caddr_t )(((m))->m_hdr.mh_data)) + (off)); else { t = m_pulldown(( m), (off), (dstoptlen), &tmp); if (t) { if (t->m_hdr.mh_len < tmp + (dstoptlen)) panic("m_pulldown malfunction"); (dstopts ) = (struct ip6_dest *)(((caddr_t)((t)->m_hdr.mh_data)) + tmp ); } else { (dstopts) = (struct ip6_dest *)((void *)0); (m) = ((void *)0); } } } while ( 0); |
66 | if (dstopts == NULL((void *)0)) |
67 | return IPPROTO_DONE257; |
68 | off += dstoptlen; |
69 | dstoptlen -= sizeof(struct ip6_dest); |
70 | opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); |
71 | |
72 | /* search header for all options. */ |
73 | for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { |
Value stored to 'optlen' is never read | |
74 | if (*opt != IP6OPT_PAD10x00 && |
75 | (dstoptlen < IP6OPT_MINLEN2 || *(opt + 1) + 2 > dstoptlen)) { |
76 | ip6stat_inc(ip6s_toosmall); |
77 | goto bad; |
78 | } |
79 | |
80 | switch (*opt) { |
81 | case IP6OPT_PAD10x00: |
82 | optlen = 1; |
83 | break; |
84 | case IP6OPT_PADN0x01: |
85 | optlen = *(opt + 1) + 2; |
86 | break; |
87 | default: /* unknown option */ |
88 | optlen = ip6_unknown_opt(opt, m, |
89 | opt - mtod(m, u_int8_t *)((u_int8_t *)((m)->m_hdr.mh_data))); |
90 | if (optlen == -1) |
91 | return (IPPROTO_DONE257); |
92 | optlen += 2; |
93 | break; |
94 | } |
95 | } |
96 | |
97 | *offp = off; |
98 | return (dstopts->ip6d_nxt); |
99 | |
100 | bad: |
101 | m_freem(m); |
102 | return (IPPROTO_DONE257); |
103 | } |