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 /* \summary: IPv4 mobility printer */ 40 41 #include <config.h> 42 43 #include "netdissect-stdinc.h" 44 45 #include "netdissect.h" 46 #include "addrtoname.h" 47 #include "extract.h" 48 49 #define MOBILE_SIZE (8) 50 51 struct mobile_ip { 52 nd_uint16_t proto; 53 nd_uint16_t hcheck; 54 nd_uint32_t odst; 55 nd_uint32_t osrc; 56 }; 57 58 #define OSRC_PRES 0x0080 /* old source is present */ 59 60 /* 61 * Deencapsulate and print a mobile-tunneled IP datagram 62 */ 63 void 64 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length) 65 { 66 const struct mobile_ip *mob; 67 struct cksum_vec vec[1]; 68 u_short proto,crc; 69 u_char osp =0; /* old source address present */ 70 71 ndo->ndo_protocol = "mobile"; 72 mob = (const struct mobile_ip *)bp; 73 74 if (length < MOBILE_SIZE || !ND_TTEST_SIZE(mob)) { 75 nd_print_trunc(ndo); 76 return; 77 } 78 ND_PRINT("mobile: "); 79 80 proto = GET_BE_U_2(mob->proto); 81 crc = GET_BE_U_2(mob->hcheck); 82 if (proto & OSRC_PRES) { 83 osp=1; 84 } 85 86 if (osp) { 87 ND_PRINT("[S] "); 88 if (ndo->ndo_vflag) 89 ND_PRINT("%s ", GET_IPADDR_STRING(mob->osrc)); 90 } else { 91 ND_PRINT("[] "); 92 } 93 if (ndo->ndo_vflag) { 94 ND_PRINT("> %s ", GET_IPADDR_STRING(mob->odst)); 95 ND_PRINT("(oproto=%u)", proto>>8); 96 } 97 vec[0].ptr = (const uint8_t *)(const void *)mob; 98 vec[0].len = osp ? 12 : 8; 99 if (in_cksum(vec, 1)!=0) { 100 ND_PRINT(" (bad checksum %u)", crc); 101 } 102 } 103