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