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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 (at) 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
     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