1 |
|
|
/* $OpenBSD: print-mobile.c,v 1.5 2015/01/16 06:40:21 deraadt Exp $ */ |
2 |
|
|
/* $NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun Exp $ */ |
3 |
|
|
|
4 |
|
|
/* |
5 |
|
|
* (c) 1998 The NetBSD Foundation, Inc. |
6 |
|
|
* All rights reserved. |
7 |
|
|
* |
8 |
|
|
* This code is derived from software contributed to The NetBSD Foundation |
9 |
|
|
* by Heiko W.Rupp <hwr@pilhuhn.de> |
10 |
|
|
* |
11 |
|
|
* Redistribution and use in source and binary forms, with or without |
12 |
|
|
* modification, are permitted provided that the following conditions |
13 |
|
|
* are met: |
14 |
|
|
* 1. Redistributions of source code must retain the above copyright |
15 |
|
|
* notice, this list of conditions and the following disclaimer. |
16 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
17 |
|
|
* notice, this list of conditions and the following disclaimer in the |
18 |
|
|
* documentation and/or other materials provided with the distribution. |
19 |
|
|
* |
20 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 |
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 |
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 |
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 |
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 |
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 |
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 |
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 |
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 |
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 |
|
|
* POSSIBILITY OF SUCH DAMAGE. |
31 |
|
|
*/ |
32 |
|
|
|
33 |
|
|
#include <sys/time.h> |
34 |
|
|
#include <sys/uio.h> |
35 |
|
|
#include <sys/socket.h> |
36 |
|
|
|
37 |
|
|
#include <netinet/in.h> |
38 |
|
|
#include <netinet/ip.h> |
39 |
|
|
|
40 |
|
|
#include <netdb.h> |
41 |
|
|
#include <stdio.h> |
42 |
|
|
|
43 |
|
|
#include "interface.h" |
44 |
|
|
#include "addrtoname.h" |
45 |
|
|
#include "extract.h" /* must come after interface.h */ |
46 |
|
|
|
47 |
|
|
#define MOBILE_SIZE (8) |
48 |
|
|
|
49 |
|
|
struct mobile_ip { |
50 |
|
|
u_int16_t proto; |
51 |
|
|
u_int16_t hcheck; |
52 |
|
|
u_int32_t odst; |
53 |
|
|
u_int32_t osrc; |
54 |
|
|
}; |
55 |
|
|
|
56 |
|
|
#define OSRC_PRES 0x0080 /* old source is present */ |
57 |
|
|
|
58 |
|
|
static u_int16_t mob_in_cksum(u_short *p, int len); |
59 |
|
|
|
60 |
|
|
/* |
61 |
|
|
* Deencapsulate and print a mobile-tunneled IP datagram |
62 |
|
|
*/ |
63 |
|
|
void |
64 |
|
|
mobile_print(const u_char *bp, u_int length) |
65 |
|
|
{ |
66 |
|
|
const u_char *cp = bp +8 ; |
67 |
|
|
const struct mobile_ip *mob; |
68 |
|
|
u_short proto,crc; |
69 |
|
|
u_char osp =0; /* old source address present */ |
70 |
|
|
|
71 |
|
|
mob = (const struct mobile_ip *)bp; |
72 |
|
|
|
73 |
|
|
if (length < MOBILE_SIZE) { |
74 |
|
|
fputs("[|mobile]", stdout); |
75 |
|
|
return; |
76 |
|
|
} |
77 |
|
|
|
78 |
|
|
proto = EXTRACT_16BITS(&mob->proto); |
79 |
|
|
crc = EXTRACT_16BITS(&mob->hcheck); |
80 |
|
|
if (proto & OSRC_PRES) { |
81 |
|
|
osp=1; |
82 |
|
|
cp +=4 ; |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
if (osp) { |
86 |
|
|
fputs("[S] ",stdout); |
87 |
|
|
if (vflag) |
88 |
|
|
(void)printf("%s ",ipaddr_string(&mob->osrc)); |
89 |
|
|
} else { |
90 |
|
|
fputs("[] ",stdout); |
91 |
|
|
} |
92 |
|
|
if (vflag) { |
93 |
|
|
(void)printf("> %s ",ipaddr_string(&mob->odst)); |
94 |
|
|
(void)printf("(oproto=%d)",proto>>8); |
95 |
|
|
} |
96 |
|
|
if (mob_in_cksum((u_short *)mob, osp ? 12 : 8)!=0) { |
97 |
|
|
(void)printf(" (bad checksum %d)",crc); |
98 |
|
|
} |
99 |
|
|
|
100 |
|
|
return; |
101 |
|
|
} |
102 |
|
|
|
103 |
|
|
static u_int16_t mob_in_cksum(u_short *p, int len) |
104 |
|
|
{ |
105 |
|
|
u_int32_t sum = 0; |
106 |
|
|
int nwords = len >> 1; |
107 |
|
|
|
108 |
|
|
while (nwords-- != 0) |
109 |
|
|
sum += *p++; |
110 |
|
|
|
111 |
|
|
if (len & 1) { |
112 |
|
|
union { |
113 |
|
|
u_int16_t w; |
114 |
|
|
u_int32_t c[2]; |
115 |
|
|
} u; |
116 |
|
|
u.c[0] = *(u_char *)p; |
117 |
|
|
u.c[1] = 0; |
118 |
|
|
sum += u.w; |
119 |
|
|
} |
120 |
|
|
|
121 |
|
|
/* end-around-carry */ |
122 |
|
|
sum = (sum >> 16) + (sum & 0xffff); |
123 |
|
|
sum += (sum >> 16); |
124 |
|
|
return (~sum); |
125 |
|
|
} |
126 |
|
|
|