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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 	u_short proto,crc;
76 	u_char osp =0;			/* old source address present */
77 
78 	mob = (const struct mobile_ip *)bp;
79 
80 	if (length < MOBILE_SIZE || !TTEST(*mob)) {
81 		fputs("[|mobile]", stdout);
82 		return;
83 	}
84 	fputs("mobile: ", stdout);
85 
86 	proto = EXTRACT_16BITS(&mob->proto);
87 	crc =  EXTRACT_16BITS(&mob->hcheck);
88 	if (proto & OSRC_PRES) {
89 		osp=1;
90 		cp +=4 ;
91 	}
92 
93 	if (osp)  {
94 		fputs("[S] ",stdout);
95 		if (vflag)
96 			(void)printf("%s ",ipaddr_string(&mob->osrc));
97 	} else {
98 		fputs("[] ",stdout);
99 	}
100 	if (vflag) {
101 		(void)printf("> %s ",ipaddr_string(&mob->odst));
102 		(void)printf("(oproto=%d)",proto>>8);
103 	}
104 	if (in_cksum((u_short *)mob, osp ? 12 : 8, 0)!=0) {
105 		(void)printf(" (bad checksum %d)",crc);
106 	}
107 
108 	return;
109 }
110