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 1.8 2024/09/02 16:15:32 christos Exp $"); 42 #endif 43 44 /* \summary: IPv4 mobility printer */ 45 46 #include <config.h> 47 48 #include "netdissect-stdinc.h" 49 50 #include "netdissect.h" 51 #include "addrtoname.h" 52 #include "extract.h" 53 54 #define MOBILE_SIZE (8) 55 56 struct mobile_ip { 57 nd_uint16_t proto; 58 nd_uint16_t hcheck; 59 nd_uint32_t odst; 60 nd_uint32_t osrc; 61 }; 62 63 #define OSRC_PRES 0x0080 /* old source is present */ 64 65 /* 66 * Deencapsulate and print a mobile-tunneled IP datagram 67 */ 68 void 69 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length) 70 { 71 const struct mobile_ip *mob; 72 struct cksum_vec vec[1]; 73 u_short proto,crc; 74 u_char osp =0; /* old source address present */ 75 76 ndo->ndo_protocol = "mobile"; 77 mob = (const struct mobile_ip *)bp; 78 79 if (length < MOBILE_SIZE || !ND_TTEST_SIZE(mob)) { 80 nd_print_trunc(ndo); 81 return; 82 } 83 ND_PRINT("mobile: "); 84 85 proto = GET_BE_U_2(mob->proto); 86 crc = GET_BE_U_2(mob->hcheck); 87 if (proto & OSRC_PRES) { 88 osp=1; 89 } 90 91 if (osp) { 92 ND_PRINT("[S] "); 93 if (ndo->ndo_vflag) 94 ND_PRINT("%s ", GET_IPADDR_STRING(mob->osrc)); 95 } else { 96 ND_PRINT("[] "); 97 } 98 if (ndo->ndo_vflag) { 99 ND_PRINT("> %s ", GET_IPADDR_STRING(mob->odst)); 100 ND_PRINT("(oproto=%u)", proto>>8); 101 } 102 vec[0].ptr = (const uint8_t *)(const void *)mob; 103 vec[0].len = osp ? 12 : 8; 104 if (in_cksum(vec, 1)!=0) { 105 ND_PRINT(" (bad checksum %u)", crc); 106 } 107 } 108