FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/dest6.c 331484 2018-03-24 12:43:34Z jtl $");
36
37 #include "opt_inet.h"
38 #include "opt_inet6.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/domain.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/errno.h>
48 #include <sys/time.h>
49 #include <sys/kernel.h>
50
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/route.h>
54
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/ip6.h>
58 #include <netinet6/ip6_var.h>
59 #include <netinet/icmp6.h>
60
61 /*
62 * Destination options header processing.
63 */
64 int
65 dest6_input(struct mbuf **mp, int *offp, int proto)
66 {
67 struct mbuf *m = *mp;
68 int off = *offp, dstoptlen, optlen;
69 struct ip6_dest *dstopts;
70 u_int8_t *opt;
71
72 /* validation of the length of the header */
73 #ifndef PULLDOWN_TEST
74 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
75 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
76 #else
77 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
78 if (dstopts == NULL)
79 return IPPROTO_DONE;
80 #endif
81 dstoptlen = (dstopts->ip6d_len + 1) << 3;
82
83 #ifndef PULLDOWN_TEST
84 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
85 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
86 #else
87 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
88 if (dstopts == NULL)
89 return IPPROTO_DONE;
90 #endif
91 off += dstoptlen;
92 dstoptlen -= sizeof(struct ip6_dest);
93 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
94
95 /* search header for all options. */
96 for (; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
97 if (*opt != IP6OPT_PAD1 &&
98 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
99 IP6STAT_INC(ip6s_toosmall);
100 goto bad;
101 }
102
103 switch (*opt) {
104 case IP6OPT_PAD1:
105 optlen = 1;
106 break;
107 case IP6OPT_PADN:
108 optlen = *(opt + 1) + 2;
109 break;
110 default: /* unknown option */
111 optlen = ip6_unknown_opt(opt, m,
112 opt - mtod(m, u_int8_t *));
113 if (optlen == -1)
114 return (IPPROTO_DONE);
115 optlen += 2;
116 break;
117 }
118 }
119
120 *offp = off;
121 return (dstopts->ip6d_nxt);
122
123 bad:
124 m_freem(m);
125 return (IPPROTO_DONE);
126 }
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