dist/tcpdump/print-mobile.c

   1 /*      $NetBSD$        */
   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 #include <sys/cdefs.h>
  44 #ifndef lint
  45 #if 0
  46 static const char rcsid[] _U_ =
  47      "@(#) Header: /tcpdump/master/tcpdump/print-mobile.c,v 1.15 2004/03/24 01:58:14 guy Exp";
  48 #else
  49 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  50 #endif
  51 #endif
  52
  53 #include <tcpdump-stdinc.h>
  54
  55 #include <stdio.h>
  56
  57 #include "interface.h"
  58 #include "addrtoname.h"
  59 #include "extract.h"            /* must come after interface.h */
  60
  61 #define MOBILE_SIZE (8)
  62
  63 struct mobile_ip {
  64         u_int16_t proto;
  65         u_int16_t hcheck;
  66         u_int32_t odst;
  67         u_int32_t osrc;
  68 };
  69
  70 #define OSRC_PRES       0x0080  /* old source is present */
  71
  72 /*
  73  * Deencapsulate and print a mobile-tunneled IP datagram
  74  */
  75 void
  76 mobile_print(const u_char *bp, u_int length)
  77 {
  78         const u_char *cp = bp +8 ;
  79         const struct mobile_ip *mob;
  80         u_short proto,crc;
  81         u_char osp =0;                  /* old source address present */
  82
  83         mob = (const struct mobile_ip *)bp;
  84
  85         if (length < MOBILE_SIZE || !TTEST(*mob)) {
  86                 fputs("[|mobile]", stdout);
  87                 return;
  88         }
  89         fputs("mobile: ", stdout);
  90
  91         proto = EXTRACT_16BITS(&mob->proto);
  92         crc =  EXTRACT_16BITS(&mob->hcheck);
  93         if (proto & OSRC_PRES) {
  94                 osp=1;
  95                 cp +=4 ;
  96         }
  97
  98         if (osp)  {
  99                 fputs("[S] ",stdout);
 100                 if (vflag)
 101                         (void)printf("%s ",ipaddr_string(&mob->osrc));
 102         } else {
 103                 fputs("[] ",stdout);
 104         }
 105         if (vflag) {
 106                 (void)printf("> %s ",ipaddr_string(&mob->odst));
 107                 (void)printf("(oproto=%d)",proto>>8);
 108         }
 109         if (in_cksum((u_short *)mob, osp ? 12 : 8, 0)!=0) {
 110                 (void)printf(" (bad checksum %d)",crc);
 111         }
 112
 113         return;
 114 }