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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* packet-fr.c
* Routines for Frame Relay dissection
*
* Copyright 2001, Paul Ionescu <paul@acorp.ro>
*
* $Id: packet-fr.c,v 1.3 2001/01/08 22:18:21 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "packet-ip.h"
#include "packet-ipx.h"
#include "packet-arp.h"
static gint proto_fr = -1;
static gint ett_fr = -1;
static gint hf_fr_dlci = -1;
static gint hf_fr_cr = -1;
static gint hf_fr_becn = -1;
static gint hf_fr_fecn = -1;
static gint hf_fr_de = -1;
static gint hf_fr_proto = -1;
static void dissect_fr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *fr_tree;
guint16 fr_header,fr_proto;
tvbuff_t *next_tvb;
CHECK_DISPLAY_AS_DATA(proto_fr, tvb, pinfo, tree);
pinfo->current_proto = "Frame Relay";
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "FR");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
fr_header = tvb_get_ntohs( tvb, 0 );
fr_proto = tvb_get_ntohs( tvb, 2 );
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "DLCI %u, proto 0x%04x",
((fr_header&0x00FF)>>4)+((fr_header&0xFC00)>>6),
fr_proto);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_fr, tvb, 0, 4, "Frame Relay");
fr_tree = proto_item_add_subtree(ti, ett_fr);
proto_tree_add_text(fr_tree,tvb,0,2,"The real DLCI is %u",((fr_header&0x00FF)>>4)+((fr_header&0xFC00)>>6));
proto_tree_add_uint(fr_tree, hf_fr_dlci, tvb, 0, 2, fr_header);
proto_tree_add_boolean(fr_tree, hf_fr_cr, tvb, 0, 1, fr_header);
proto_tree_add_boolean(fr_tree, hf_fr_fecn, tvb, 1, 1, fr_header);
proto_tree_add_boolean(fr_tree, hf_fr_becn, tvb, 1, 1, fr_header);
proto_tree_add_boolean(fr_tree, hf_fr_de, tvb, 1, 1, fr_header);
proto_tree_add_uint(fr_tree, hf_fr_proto,tvb, 2, 2, fr_proto );
}
next_tvb = tvb_new_subset(tvb, 4, -1, -1);
switch (fr_proto){
/* case 0x0703:
dissect_lmi(next_tvb,pinfo,tree);
break;
this is not yet implemented
*/
case 0x0800:
dissect_ip(next_tvb,pinfo,tree);
break;
case 0x8137:
dissect_ipx(next_tvb,pinfo,tree);
break;
default:
dissect_data(next_tvb,0,pinfo,tree);
break;
}
return;
}
/* Register the protocol with Ethereal */
void proto_register_fr(void)
{
static hf_register_info hf[] = {
{ &hf_fr_dlci, {
"DLCI", "fr.dlci", FT_UINT16, BASE_DEC,
NULL, 0xFCF0, "Data-Link Connection Identifier" }},
{ &hf_fr_cr, {
"CR", "fr.cr", FT_BOOLEAN, 16,
NULL, 0x0200, "Command/Response" }},
{ &hf_fr_fecn, {
"FECN", "fr.fecn", FT_BOOLEAN, 16,
NULL, 0x0008, "Forward Explicit Congestion Notification" }},
{ &hf_fr_becn, {
"BECN", "fr.becn", FT_BOOLEAN, 16,
NULL, 0x0004, "Backward Explicit Congestion Notification" }},
{ &hf_fr_de, {
"DE", "fr.de", FT_BOOLEAN, 16,
NULL, 0x0002, "Discard Eligibility" }},
{ &hf_fr_proto, {
"Encapsulated Protocol", "fr.proto", FT_UINT16, BASE_HEX,
NULL, 0x0, "FrameRelay Encapsulated Protocol" }},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_fr,
};
proto_fr = proto_register_protocol("Frame Relay", "FR", "fr");
proto_register_field_array(proto_fr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("fr", dissect_fr);
};
void proto_reg_handoff_fr(void)
{
dissector_add("wtap_encap", WTAP_ENCAP_FRELAY, dissect_fr);
}
|
