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 #define NETDISSECT_REWORKED 40 #ifdef HAVE_CONFIG_H 41 #include "config.h" 42 #endif 43 44 #include <tcpdump-stdinc.h> 45 46 #include "interface.h" 47 #include "addrtoname.h" 48 #include "extract.h" /* must come after interface.h */ 49 50 #define MOBILE_SIZE (8) 51 52 struct mobile_ip { 53 uint16_t proto; 54 uint16_t hcheck; 55 uint32_t odst; 56 uint32_t osrc; 57 }; 58 59 #define OSRC_PRES 0x0080 /* old source is present */ 60 61 /* 62 * Deencapsulate and print a mobile-tunneled IP datagram 63 */ 64 void 65 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length) 66 { 67 const struct mobile_ip *mob; 68 struct cksum_vec vec[1]; 69 u_short proto,crc; 70 u_char osp =0; /* old source address present */ 71 72 mob = (const struct mobile_ip *)bp; 73 74 if (length < MOBILE_SIZE || !ND_TTEST(*mob)) { 75 ND_PRINT((ndo, "[|mobile]")); 76 return; 77 } 78 ND_PRINT((ndo, "mobile: ")); 79 80 proto = EXTRACT_16BITS(&mob->proto); 81 crc = EXTRACT_16BITS(&mob->hcheck); 82 if (proto & OSRC_PRES) { 83 osp=1; 84 } 85 86 if (osp) { 87 ND_PRINT((ndo, "[S] ")); 88 if (ndo->ndo_vflag) 89 ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc))); 90 } else { 91 ND_PRINT((ndo, "[] ")); 92 } 93 if (ndo->ndo_vflag) { 94 ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst))); 95 ND_PRINT((ndo, "(oproto=%d)", proto>>8)); 96 } 97 vec[0].ptr = (const uint8_t *)(void *)mob; 98 vec[0].len = osp ? 12 : 8; 99 if (in_cksum(vec, 1)!=0) { 100 ND_PRINT((ndo, " (bad checksum %d)", crc)); 101 } 102 } 103