1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* $NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr Exp $ */
/*
* (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Heiko W.Rupp <hwr@pilhuhn.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* \summary: IPv4 mobility printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#define MOBILE_SIZE (8)
struct mobile_ip {
uint16_t proto;
uint16_t hcheck;
uint32_t odst;
uint32_t osrc;
};
#define OSRC_PRES 0x0080 /* old source is present */
/*
* Deencapsulate and print a mobile-tunneled IP datagram
*/
void
mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
const struct mobile_ip *mob;
struct cksum_vec vec[1];
u_short proto,crc;
u_char osp =0; /* old source address present */
mob = (const struct mobile_ip *)bp;
if (length < MOBILE_SIZE || !ND_TTEST(*mob)) {
ND_PRINT((ndo, "[|mobile]"));
return;
}
ND_PRINT((ndo, "mobile: "));
proto = EXTRACT_16BITS(&mob->proto);
crc = EXTRACT_16BITS(&mob->hcheck);
if (proto & OSRC_PRES) {
osp=1;
}
if (osp) {
ND_PRINT((ndo, "[S] "));
if (ndo->ndo_vflag)
ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc)));
} else {
ND_PRINT((ndo, "[] "));
}
if (ndo->ndo_vflag) {
ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst)));
ND_PRINT((ndo, "(oproto=%d)", proto>>8));
}
vec[0].ptr = (const uint8_t *)(const void *)mob;
vec[0].len = osp ? 12 : 8;
if (in_cksum(vec, 1)!=0) {
ND_PRINT((ndo, " (bad checksum %d)", crc));
}
}
|
