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1 office 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 #define NETDISSECT_REWORKED
40 #ifdef HAVE_CONFIG_H
41 #include "config.h"
42 #endif
43  
44 #include <tcpdump-stdinc.h>
45  
46 #include "interface.h"
47 #include "addrtoname.h"
48 #include "extract.h" /* must come after interface.h */
49  
50 #define MOBILE_SIZE (8)
51  
52 struct mobile_ip {
53 uint16_t proto;
54 uint16_t hcheck;
55 uint32_t odst;
56 uint32_t osrc;
57 };
58  
59 #define OSRC_PRES 0x0080 /* old source is present */
60  
61 /*
62 * Deencapsulate and print a mobile-tunneled IP datagram
63 */
64 void
65 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
66 {
67 const struct mobile_ip *mob;
68 struct cksum_vec vec[1];
69 u_short proto,crc;
70 u_char osp =0; /* old source address present */
71  
72 mob = (const struct mobile_ip *)bp;
73  
74 if (length < MOBILE_SIZE || !ND_TTEST(*mob)) {
75 ND_PRINT((ndo, "[|mobile]"));
76 return;
77 }
78 ND_PRINT((ndo, "mobile: "));
79  
80 proto = EXTRACT_16BITS(&mob->proto);
81 crc = EXTRACT_16BITS(&mob->hcheck);
82 if (proto & OSRC_PRES) {
83 osp=1;
84 }
85  
86 if (osp) {
87 ND_PRINT((ndo, "[S] "));
88 if (ndo->ndo_vflag)
89 ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc)));
90 } else {
91 ND_PRINT((ndo, "[] "));
92 }
93 if (ndo->ndo_vflag) {
94 ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst)));
95 ND_PRINT((ndo, "(oproto=%d)", proto>>8));
96 }
97 vec[0].ptr = (const uint8_t *)(void *)mob;
98 vec[0].len = osp ? 12 : 8;
99 if (in_cksum(vec, 1)!=0) {
100 ND_PRINT((ndo, " (bad checksum %d)", crc));
101 }
102 }