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