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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/* packet-pw-hdlc.c
* Routines for HDLC PW dissection as per RFC4618.
* Copyright 2009, Dmitry Trebich, Artem Tamazov <artem.tamazov@tellabs.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* History:
* ---------------------------------
* 02.03.2009 Initial implementation, supports:
* - HDLC mode (rfc4618 5.1), no CW, payload is PPP (PPP in HDLC-like Framing (rfc1662)).
* - FR port mode (rfc4618 5.2), no CW.
*
* [informative: Not supported yet:
* - All kinds of HDLC PW with CW.
* - PPP mode (rfc4618 5.3).
* - For HDLC mode, decoding payloads other than PPP.]
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "packet-mpls.h"
static dissector_handle_t ppp_handle;
static dissector_handle_t fr_handle;
static gint proto_pw_hdlc_nocw_fr = -1;
static gint proto_pw_hdlc_nocw_hdlc_ppp = -1;
static gint ett_pw_hdlc = -1;
static int hf_pw_hdlc = -1;
static int hf_pw_hdlc_address_field = -1;
static int hf_pw_hdlc_address = -1;
static int hf_pw_hdlc_cr_bit = -1;
static int hf_pw_hdlc_control_field = -1;
static int hf_pw_hdlc_pf_bit = -1;
static void dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
{
call_dissector( fr_handle, tvb, pinfo, tree );
}
static void dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree )
{
if (tvb_reported_length_remaining(tvb, 0) < 2)
{
if (tree)
{
proto_tree_add_text(tree, tvb, 0, -1, "Error processing message");
}
return;
}
if (tree)
{
proto_tree *tr;
proto_item *item;
proto_item *item_address;
proto_item *item_control;
guint8 addr;
guint8 control;
addr = tvb_get_guint8(tvb, 0);
control = tvb_get_guint8(tvb, 1);
item = proto_tree_add_item( tree, proto_pw_hdlc_nocw_hdlc_ppp, tvb, 0, 2, ENC_NA );
tr = proto_item_add_subtree( item, ett_pw_hdlc );
item_address = proto_tree_add_uint( tr, hf_pw_hdlc_address_field, tvb, 0, 1, addr );
item_control = proto_tree_add_uint_format( tr, hf_pw_hdlc_control_field, tvb, 1, 1, control, "Control field: 0x%x", control );
tr = proto_item_add_subtree( item_address, ett_pw_hdlc );
if ( 0x3F == (( addr & 0xFC ) >> 2 ))
proto_tree_add_uint_format( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "Address: 0x%x (All stations)", 0x3F );
else
proto_tree_add_uint( tr, hf_pw_hdlc_address, tvb, 0, 1, ( addr & 0xFC ) >> 2 );
proto_tree_add_uint( tr, hf_pw_hdlc_cr_bit, tvb, 0, 1, ( addr & 2 ) >> 1 );
tr = proto_item_add_subtree( item_control, ett_pw_hdlc );
if ( control & 1 )
{
if ( control & 2 )
{
guint8 modifier2;
guint8 modifier3;
proto_tree_add_text( tr, tvb, 1, 1, "U frame" );
proto_tree_add_uint( tr, hf_pw_hdlc_pf_bit, tvb, 1, 1, ( control & 0x10 ) >> 4 );
modifier2 = (( control & 0xC ) >> 2 );
modifier3 = (( control & 0xE0 ) >> 5 );
/**/ if ( modifier2 == 0 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UI - Unnumbered information" );
else if ( modifier2 == 0 && modifier3 == 1 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UP - Unnumbered poll" );
else if ( modifier2 == 0 && modifier3 == 2 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: DISC/RD - Disconnect/Request disconnect" );
else if ( modifier2 == 0 && modifier3 == 3 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: UA - Unnumbered acknowledgment" );
else if ( modifier2 == 0 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SNRM - Set normal response mode" );
else if ( modifier2 == 0 && modifier3 == 7 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: TEST - Test" );
else if ( modifier2 == 1 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SIM/RIM"
" - Set initialization mode/Request initialization mode" );
else if ( modifier2 == 1 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: FRMR - Frame reject" );
else if ( modifier2 == 3 && modifier3 == 0 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SARM/DM"
" - Set asynchronous response mode/Disconnect mode" );
else if ( modifier2 == 3 && modifier3 == 1 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SABM - Set asynchronous balanced mode" );
else if ( modifier2 == 3 && modifier3 == 2 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SARME - Set asynchronous response extended mode" );
else if ( modifier2 == 3 && modifier3 == 3 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SABME - Set asynchronous balanced extended mode" );
else if ( modifier2 == 3 && modifier3 == 4 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: RSET - Reset" );
else if ( modifier2 == 3 && modifier3 == 5 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: XID - Exchange identification" );
else if ( modifier2 == 3 && modifier3 == 6 )
proto_tree_add_text( tr, tvb, 1, 1,
"Modifier: SNRME - Set normal response extended mode" );
}
else
{
proto_tree_add_text( tr, tvb, 1, 1, "S frame" );
}
}
else
{
proto_tree_add_text( tr, tvb, 1, 1, "I frame" );
}
}
call_dissector( ppp_handle, tvb_new_subset_remaining(tvb, 2), pinfo, tree );
}
void proto_register_pw_hdlc(void)
{
static hf_register_info hf[] = {
{
&hf_pw_hdlc,
{
"PW HDLC", "pw_hdlc", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_address_field,
{
"Address field", "pw_hdlc.address_field",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_address,
{
"Address", "pw_hdlc.address",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_cr_bit,
{
"C/R bit", "pw_hdlc.cr_bit",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_control_field,
{
"Control field", "pw_hdlc.control_field",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{
&hf_pw_hdlc_pf_bit,
{
"Poll/Final bit", "pw_hdlc.pf_bit",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
}
}
};
static gint *ett[] = {
&ett_pw_hdlc
};
proto_pw_hdlc_nocw_fr = proto_register_protocol("HDLC PW, FR port mode (no CW)", /*not displayed*/
"HDLC PW, FR port mode (no CW)",
"pw_hdlc_nocw_fr" );
proto_pw_hdlc_nocw_hdlc_ppp = proto_register_protocol("HDLC-like framing for PPP",
"HDLC PW with PPP payload (no CW)",
"pw_hdlc_nocw_hdlc_ppp" );
proto_register_field_array(proto_pw_hdlc_nocw_fr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr );
register_dissector("pw_hdlc_nocw_hdlc_ppp", dissect_pw_hdlc_nocw_hdlc_ppp, proto_pw_hdlc_nocw_hdlc_ppp );
}
void proto_reg_handoff_pw_hdlc(void)
{
dissector_handle_t handle;
handle = find_dissector("pw_hdlc_nocw_fr");
dissector_add_uint( "mpls.label", LABEL_INVALID, handle );
handle = find_dissector("pw_hdlc_nocw_hdlc_ppp");
dissector_add_uint( "mpls.label", LABEL_INVALID, handle );
ppp_handle = find_dissector( "ppp" );
fr_handle = find_dissector( "fr" );
}
|
