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	uint16_t proto;
55	uint16_t hcheck;
56	uint32_t odst;
57	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	mob = (const struct mobile_ip *)bp;
74
75	if (length < MOBILE_SIZE || !ND_TTEST(*mob)) {
76		ND_PRINT((ndo, "[|mobile]"));
77		return;
78	}
79	ND_PRINT((ndo, "mobile: "));
80
81	proto = EXTRACT_16BITS(&mob->proto);
82	crc =  EXTRACT_16BITS(&mob->hcheck);
83	if (proto & OSRC_PRES) {
84		osp=1;
85	}
86
87	if (osp)  {
88		ND_PRINT((ndo, "[S] "));
89		if (ndo->ndo_vflag)
90			ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc)));
91	} else {
92		ND_PRINT((ndo, "[] "));
93	}
94	if (ndo->ndo_vflag) {
95		ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst)));
96		ND_PRINT((ndo, "(oproto=%d)", proto>>8));
97	}
98	vec[0].ptr = (const uint8_t *)(const void *)mob;
99	vec[0].len = osp ? 12 : 8;
100	if (in_cksum(vec, 1)!=0) {
101		ND_PRINT((ndo, " (bad checksum %d)", crc));
102	}
103}
104