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
mobile_print(netdissect_options * ndo,const u_char * bp,u_int length)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