FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c
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: src/sys/netinet6/dest6.c,v 1.15 2008/12/02 21:37:28 bz Exp $");
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 #include <netinet6/vinet6.h>
59
60 /*
61 * Destination options header processing.
62 */
63 int
64 dest6_input(struct mbuf **mp, int *offp, int proto)
65 {
66 INIT_VNET_INET6(curvnet);
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 (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
97 if (*opt != IP6OPT_PAD1 &&
98 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
99 V_ip6stat.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 }
127
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