1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/netinet6/dest6.c 183550 2008-10-02 15:37:58Z zec $");
34
35#include "opt_inet.h"
36#include "opt_inet6.h"
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/malloc.h>
41#include <sys/mbuf.h>
42#include <sys/domain.h>
43#include <sys/protosw.h>
44#include <sys/socket.h>
45#include <sys/errno.h>
46#include <sys/time.h>
47#include <sys/kernel.h>
48#include <sys/vimage.h>
49
50#include <net/if.h>
51#include <net/route.h>
52
53#include <netinet/in.h>
54#include <netinet/in_var.h>
55#include <netinet/ip6.h>
56#include <netinet6/ip6_var.h>
57#include <netinet/icmp6.h>
58
59/*
60 * Destination options header processing.
61 */
62int
63dest6_input(struct mbuf **mp, int *offp, int proto)
64{
65 INIT_VNET_INET6(curvnet);
66 struct mbuf *m = *mp;
67 int off = *offp, dstoptlen, optlen;
68 struct ip6_dest *dstopts;
69 u_int8_t *opt;
70
71 /* validation of the length of the header */
72#ifndef PULLDOWN_TEST
73 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
74 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
75#else
76 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
77 if (dstopts == NULL)
78 return IPPROTO_DONE;
79#endif
80 dstoptlen = (dstopts->ip6d_len + 1) << 3;
81
82#ifndef PULLDOWN_TEST
83 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
84 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
85#else
86 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
87 if (dstopts == NULL)
88 return IPPROTO_DONE;
89#endif
90 off += dstoptlen;
91 dstoptlen -= sizeof(struct ip6_dest);
92 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
93
94 /* search header for all options. */
95 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
96 if (*opt != IP6OPT_PAD1 &&
97 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
98 V_ip6stat.ip6s_toosmall++;
99 goto bad;
100 }
101
102 switch (*opt) {
103 case IP6OPT_PAD1:
104 optlen = 1;
105 break;
106 case IP6OPT_PADN:
107 optlen = *(opt + 1) + 2;
108 break;
109 default: /* unknown option */
110 optlen = ip6_unknown_opt(opt, m,
111 opt - mtod(m, u_int8_t *));
112 if (optlen == -1)
113 return (IPPROTO_DONE);
114 optlen += 2;
115 break;
116 }
117 }
118
119 *offp = off;
120 return (dstopts->ip6d_nxt);
121
122 bad:
123 m_freem(m);
124 return (IPPROTO_DONE);
125}