1 /* $NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr Exp $ */
2
3 /*
4 * (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Heiko W.Rupp <hwr@pilhuhn.de>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 /* \summary: IPv4 mobility printer */
40
41 #ifdef HAVE_CONFIG_H
42 #include "config.h"
43 #endif
44
45 #include <netdissect-stdinc.h>
46
47 #include "netdissect.h"
48 #include "addrtoname.h"
49 #include "extract.h"
50
51 #define MOBILE_SIZE (8)
52
53 struct mobile_ip {
54 uint16_t proto;
55 uint16_t hcheck;
56 uint32_t odst;
57 uint32_t osrc;
58 };
59
60 #define OSRC_PRES 0x0080 /* old source is present */
61
62 /*
63 * Deencapsulate and print a mobile-tunneled IP datagram
64 */
65 void
mobile_print(netdissect_options * ndo,const u_char * bp,u_int length)66 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
67 {
68 const struct mobile_ip *mob;
69 struct cksum_vec vec[1];
70 u_short proto,crc;
71 u_char osp =0; /* old source address present */
72
73 mob = (const struct mobile_ip *)bp;
74
75 if (length < MOBILE_SIZE || !ND_TTEST(*mob)) {
76 ND_PRINT((ndo, "[|mobile]"));
77 return;
78 }
79 ND_PRINT((ndo, "mobile: "));
80
81 proto = EXTRACT_16BITS(&mob->proto);
82 crc = EXTRACT_16BITS(&mob->hcheck);
83 if (proto & OSRC_PRES) {
84 osp=1;
85 }
86
87 if (osp) {
88 ND_PRINT((ndo, "[S] "));
89 if (ndo->ndo_vflag)
90 ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc)));
91 } else {
92 ND_PRINT((ndo, "[] "));
93 }
94 if (ndo->ndo_vflag) {
95 ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst)));
96 ND_PRINT((ndo, "(oproto=%d)", proto>>8));
97 }
98 vec[0].ptr = (const uint8_t *)(const void *)mob;
99 vec[0].len = osp ? 12 : 8;
100 if (in_cksum(vec, 1)!=0) {
101 ND_PRINT((ndo, " (bad checksum %d)", crc));
102 }
103 }
104