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 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: print-mobile.c,v 1.6 2017/02/05 04:05:05 spz Exp $"); 42 #endif 43 44 /* \summary: IPv4 mobility printer */ 45 46 #ifdef HAVE_CONFIG_H 47 #include "config.h" 48 #endif 49 50 #include <netdissect-stdinc.h> 51 52 #include "netdissect.h" 53 #include "addrtoname.h" 54 #include "extract.h" 55 56 #define MOBILE_SIZE (8) 57 58 struct mobile_ip { 59 uint16_t proto; 60 uint16_t hcheck; 61 uint32_t odst; 62 uint32_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(netdissect_options *ndo, const u_char *bp, u_int length) 72 { 73 const struct mobile_ip *mob; 74 struct cksum_vec vec[1]; 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 || !ND_TTEST(*mob)) { 81 ND_PRINT((ndo, "[|mobile]")); 82 return; 83 } 84 ND_PRINT((ndo, "mobile: ")); 85 86 proto = EXTRACT_16BITS(&mob->proto); 87 crc = EXTRACT_16BITS(&mob->hcheck); 88 if (proto & OSRC_PRES) { 89 osp=1; 90 } 91 92 if (osp) { 93 ND_PRINT((ndo, "[S] ")); 94 if (ndo->ndo_vflag) 95 ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc))); 96 } else { 97 ND_PRINT((ndo, "[] ")); 98 } 99 if (ndo->ndo_vflag) { 100 ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst))); 101 ND_PRINT((ndo, "(oproto=%d)", proto>>8)); 102 } 103 vec[0].ptr = (const uint8_t *)(const void *)mob; 104 vec[0].len = osp ? 12 : 8; 105 if (in_cksum(vec, 1)!=0) { 106 ND_PRINT((ndo, " (bad checksum %d)", crc)); 107 } 108 } 109