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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/* $OpenBSD: print-mobile.c,v 1.2 2008/06/27 06:03:08 ray Exp $ */
/* $NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun 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.
*
* 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.
*/
#if 0
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun Exp $");
#endif
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netdb.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
#define MOBILE_SIZE (8)
struct mobile_ip {
u_int16_t proto;
u_int16_t hcheck;
u_int32_t odst;
u_int32_t osrc;
};
#define OSRC_PRES 0x0080 /* old source is present */
static u_int16_t mob_in_cksum(u_short *p, int len);
/*
* Deencapsulate and print a mobile-tunneled IP datagram
*/
void
mobile_print(const u_char *bp, u_int length)
{
const u_char *cp = bp +8 ;
const struct mobile_ip *mob;
u_short proto,crc;
u_char osp =0; /* old source address present */
mob = (const struct mobile_ip *)bp;
if (length < MOBILE_SIZE) {
fputs("[|mobile]", stdout);
return;
}
proto = EXTRACT_16BITS(&mob->proto);
crc = EXTRACT_16BITS(&mob->hcheck);
if (proto & OSRC_PRES) {
osp=1;
cp +=4 ;
}
if (osp) {
fputs("[S] ",stdout);
if (vflag)
(void)printf("%s ",ipaddr_string(&mob->osrc));
} else {
fputs("[] ",stdout);
}
if (vflag) {
(void)printf("> %s ",ipaddr_string(&mob->odst));
(void)printf("(oproto=%d)",proto>>8);
}
if (mob_in_cksum((u_short *)mob, osp ? 12 : 8)!=0) {
(void)printf(" (bad checksum %d)",crc);
}
return;
}
static u_int16_t mob_in_cksum(u_short *p, int len)
{
u_int32_t sum = 0;
int nwords = len >> 1;
while (nwords-- != 0)
sum += *p++;
if (len & 1) {
union {
u_int16_t w;
u_int32_t c[2];
} u;
u.c[0] = *(u_char *)p;
u.c[1] = 0;
sum += u.w;
}
/* end-around-carry */
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return (~sum);
}
|
