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 #ifdef HAVE_CONFIG_H
40 #include "config.h"
41 #endif
42
43 #ifndef lint
44 static const char rcsid[] _U_ =
45 "@(#) $Header: /tcpdump/master/tcpdump/print-mobile.c,v 1.15 2004-03-24 01:58:14 guy Exp $";
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #include <stdio.h>
51
52 #include "interface.h"
53 #include "addrtoname.h"
54 #include "extract.h" /* must come after interface.h */
55
56 #define MOBILE_SIZE (8)
57
58 struct mobile_ip {
59 u_int16_t proto;
60 u_int16_t hcheck;
61 u_int32_t odst;
62 u_int32_t osrc;
63 };
64
65 #define OSRC_PRES 0x0080 /* old source is present */
66
67 /*
68 * Deencapsulate and print a mobile-tunneled IP datagram
69 */
70 void
mobile_print(const u_char * bp,u_int length)71 mobile_print(const u_char *bp, u_int length)
72 {
73 const u_char *cp = bp +8 ;
74 const struct mobile_ip *mob;
75 struct cksum_vec vec[1];
76 u_short proto,crc;
77 u_char osp =0; /* old source address present */
78
79 mob = (const struct mobile_ip *)bp;
80
81 if (length < MOBILE_SIZE || !TTEST(*mob)) {
82 fputs("[|mobile]", stdout);
83 return;
84 }
85 fputs("mobile: ", stdout);
86
87 proto = EXTRACT_16BITS(&mob->proto);
88 crc = EXTRACT_16BITS(&mob->hcheck);
89 if (proto & OSRC_PRES) {
90 osp=1;
91 cp +=4 ;
92 }
93
94 if (osp) {
95 fputs("[S] ",stdout);
96 if (vflag)
97 (void)printf("%s ",ipaddr_string(&mob->osrc));
98 } else {
99 fputs("[] ",stdout);
100 }
101 if (vflag) {
102 (void)printf("> %s ",ipaddr_string(&mob->odst));
103 (void)printf("(oproto=%d)",proto>>8);
104 }
105 vec[0].ptr = (const u_int8_t *)(void *)mob;
106 vec[0].len = osp ? 12 : 8;
107 if (in_cksum(vec, 1)!=0) {
108 (void)printf(" (bad checksum %d)",crc);
109 }
110
111 return;
112 }
113