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 #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: print-mobile.c,v 1.2 2010/12/05 05:11:30 christos 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 } 115