| File: | netinet6/dest6.c |
| Warning: | line 70, column 7 Value stored to 'optlen' is never read |
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| 1 | /* $OpenBSD: dest6.c,v 1.19 2022/06/29 22:45:24 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/socket.h> |
| 37 | #include <sys/errno.h> |
| 38 | #include <sys/time.h> |
| 39 | #include <sys/kernel.h> |
| 40 | |
| 41 | #include <netinet/in.h> |
| 42 | #include <netinet/ip6.h> |
| 43 | #include <netinet6/ip6_var.h> |
| 44 | #include <netinet/icmp6.h> |
| 45 | |
| 46 | /* |
| 47 | * Destination options header processing. |
| 48 | */ |
| 49 | int |
| 50 | dest6_input(struct mbuf **mp, int *offp, int proto, int af) |
| 51 | { |
| 52 | int off = *offp, dstoptlen, optlen; |
| 53 | struct ip6_dest *dstopts; |
| 54 | u_int8_t *opt; |
| 55 | |
| 56 | /* validation of the length of the header */ |
| 57 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, sizeof(*dstopts))do { struct mbuf *t; int tmp; if ((*mp)->m_hdr.mh_len >= (off) + (sizeof(*dstopts))) (dstopts) = (struct ip6_dest *)( ((caddr_t)(((*mp))->m_hdr.mh_data)) + (off)); else { t = m_pulldown ((*mp), (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 ); (*mp) = ((void *)0); } } } while ( 0); |
| 58 | if (dstopts == NULL((void *)0)) |
| 59 | return IPPROTO_DONE257; |
| 60 | dstoptlen = (dstopts->ip6d_len + 1) << 3; |
| 61 | |
| 62 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, dstoptlen)do { struct mbuf *t; int tmp; if ((*mp)->m_hdr.mh_len >= (off) + (dstoptlen)) (dstopts) = (struct ip6_dest *)(((caddr_t )(((*mp))->m_hdr.mh_data)) + (off)); else { t = m_pulldown ((*mp), (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 ); (*mp) = ((void *)0); } } } while ( 0); |
| 63 | if (dstopts == NULL((void *)0)) |
| 64 | return IPPROTO_DONE257; |
| 65 | off += dstoptlen; |
| 66 | dstoptlen -= sizeof(struct ip6_dest); |
| 67 | opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); |
| 68 | |
| 69 | /* search header for all options. */ |
| 70 | for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { |
Value stored to 'optlen' is never read | |
| 71 | if (*opt != IP6OPT_PAD10x00 && |
| 72 | (dstoptlen < IP6OPT_MINLEN2 || *(opt + 1) + 2 > dstoptlen)) { |
| 73 | ip6stat_inc(ip6s_toosmall); |
| 74 | goto bad; |
| 75 | } |
| 76 | |
| 77 | switch (*opt) { |
| 78 | case IP6OPT_PAD10x00: |
| 79 | optlen = 1; |
| 80 | break; |
| 81 | case IP6OPT_PADN0x01: |
| 82 | optlen = *(opt + 1) + 2; |
| 83 | break; |
| 84 | default: /* unknown option */ |
| 85 | optlen = ip6_unknown_opt(mp, opt, |
| 86 | opt - mtod(*mp, u_int8_t *)((u_int8_t *)((*mp)->m_hdr.mh_data))); |
| 87 | if (optlen == -1) |
| 88 | return (IPPROTO_DONE257); |
| 89 | optlen += 2; |
| 90 | break; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | *offp = off; |
| 95 | return (dstopts->ip6d_nxt); |
| 96 | |
| 97 | bad: |
| 98 | m_freemp(mp); |
| 99 | return (IPPROTO_DONE257); |
| 100 | } |