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
|
/*
* packet-ieee80211-netmon.c
* Decode packets with a Network Monitor 802.11 radio header
*
* $Id$
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
/* protocol */
static int proto_netmon_802_11 = -1;
#define MIN_HEADER_LEN 32
/* op_mode */
#define OP_MODE_STA 0x00000001 /* station mode */
#define OP_MODE_AP 0x00000002 /* AP mode */
#define OP_MODE_STA_EXT 0x00000004 /* extensible station mode */
#define OP_MODE_MON 0x80000000 /* monitor mode */
/* phy_type */
#define PHY_TYPE_11A 4
#define PHY_TYPE_11B 5
#define PHY_TYPE_11G 6
#define PHY_TYPE_11N 7
static int hf_netmon_802_11_version = -1;
static int hf_netmon_802_11_length = -1;
static int hf_netmon_802_11_op_mode = -1;
static int hf_netmon_802_11_op_mode_sta = -1;
static int hf_netmon_802_11_op_mode_ap = -1;
static int hf_netmon_802_11_op_mode_sta_ext = -1;
static int hf_netmon_802_11_op_mode_mon = -1;
static int hf_netmon_802_11_flags = -1;
static int hf_netmon_802_11_phy_type = -1;
static int hf_netmon_802_11_channel = -1;
static int hf_netmon_802_11_frequency = -1;
static int hf_netmon_802_11_rssi = -1;
static int hf_netmon_802_11_datarate = -1;
static int hf_netmon_802_11_timestamp = -1;
static gint ett_netmon_802_11 = -1;
static gint ett_netmon_802_11_op_mode = -1;
static dissector_handle_t ieee80211_handle;
static int
dissect_netmon_802_11(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *wlan_tree, *opmode_tree;
proto_item *ti;
tvbuff_t *next_tvb;
int offset;
guint8 version;
guint16 length;
guint32 flags;
guint32 channel;
gint32 rssi;
guint8 rate;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN");
col_clear(pinfo->cinfo, COL_INFO);
offset = 0;
version = tvb_get_guint8(tvb, offset);
length = tvb_get_letohs(tvb, offset+1);
col_add_fstr(pinfo->cinfo, COL_INFO, "NetMon WLAN Capture v%u, Length %u",
version, length);
if (version != 2) {
/* XXX - complain */
goto skip;
}
if (length < MIN_HEADER_LEN) {
/* XXX - complain */
goto skip;
}
/* Dissect the packet */
if (tree) {
ti = proto_tree_add_item(tree, proto_netmon_802_11, tvb, 0, length,
ENC_NA);
wlan_tree = proto_item_add_subtree(ti, ett_netmon_802_11);
proto_tree_add_item(wlan_tree, hf_netmon_802_11_version, tvb, offset, 1,
ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(wlan_tree, hf_netmon_802_11_length, tvb, offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
ti = proto_tree_add_item(wlan_tree, hf_netmon_802_11_op_mode, tvb, offset,
4, ENC_LITTLE_ENDIAN);
opmode_tree = proto_item_add_subtree(ti, ett_netmon_802_11_op_mode);
proto_tree_add_item(opmode_tree, hf_netmon_802_11_op_mode_sta, tvb, offset,
4, ENC_LITTLE_ENDIAN);
proto_tree_add_item(opmode_tree, hf_netmon_802_11_op_mode_ap, tvb, offset,
4, ENC_LITTLE_ENDIAN);
proto_tree_add_item(opmode_tree, hf_netmon_802_11_op_mode_sta_ext, tvb,
offset, 4, ENC_LITTLE_ENDIAN);
proto_tree_add_item(opmode_tree, hf_netmon_802_11_op_mode_mon, tvb, offset,
4, ENC_LITTLE_ENDIAN);
offset += 4;
flags = tvb_get_letohl(tvb, offset);
offset += 4;
if (flags != 0xffffffff) {
proto_tree_add_item(wlan_tree, hf_netmon_802_11_phy_type, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
channel = tvb_get_letohl(tvb, offset);
if (channel < 1000) {
proto_tree_add_uint(wlan_tree, hf_netmon_802_11_channel,
tvb, offset, 4, channel);
} else {
proto_tree_add_uint_format_value(wlan_tree, hf_netmon_802_11_frequency,
tvb, offset, 4, channel,
"%u Mhz", channel);
}
offset += 4;
rssi = tvb_get_letohl(tvb, offset);
proto_tree_add_int_format_value(wlan_tree, hf_netmon_802_11_rssi,
tvb, offset, 4, rssi,
"%d dBm", rssi);
offset += 4;
rate = tvb_get_guint8(tvb, offset);
if (rate == 0) {
proto_tree_add_uint_format_value(wlan_tree, hf_netmon_802_11_datarate,
tvb, offset, 1, rate,
"Unknown");
} else {
proto_tree_add_uint_format_value(wlan_tree, hf_netmon_802_11_datarate,
tvb, offset, 1, rate,
"%f Mb/s", rate*.5);
}
offset += 1;
} else
offset += 13;
proto_tree_add_item(wlan_tree, hf_netmon_802_11_timestamp, tvb, offset, 8,
ENC_LITTLE_ENDIAN);
offset += 8;
}
/* no return */
skip:
offset = length;
/* dissect the 802.11 header next */
next_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(ieee80211_handle, next_tvb, pinfo, tree);
return offset;
}
void
proto_register_netmon_802_11(void)
{
static const value_string phy_type[] = {
{ PHY_TYPE_11A, "802.11a" },
{ PHY_TYPE_11B, "802.11b" },
{ PHY_TYPE_11G, "802.11g" },
{ PHY_TYPE_11N, "802.11n" },
{ 0, NULL },
};
static hf_register_info hf[] = {
{ &hf_netmon_802_11_version, { "Header revision", "netmon_802_11.version", FT_UINT8,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_length, { "Header length", "netmon_802_11.length", FT_UINT16,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_op_mode, { "Operation mode", "netmon_802_11.op_mode", FT_UINT32,
BASE_HEX, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_op_mode_sta, { "Station mode", "netmon_802_11.op_mode.sta", FT_UINT32,
BASE_HEX, NULL, OP_MODE_STA, NULL, HFILL } },
{ &hf_netmon_802_11_op_mode_ap, { "AP mode", "netmon_802_11.op_mode.ap", FT_UINT32,
BASE_HEX, NULL, OP_MODE_AP, NULL, HFILL } },
{ &hf_netmon_802_11_op_mode_sta_ext, { "Extensible station mode", "netmon_802_11.op_mode.sta_ext", FT_UINT32,
BASE_HEX, NULL, OP_MODE_STA_EXT, NULL, HFILL } },
{ &hf_netmon_802_11_op_mode_mon, { "Monitor mode", "netmon_802_11.op_mode.on", FT_UINT32,
BASE_HEX, NULL, OP_MODE_MON, NULL, HFILL } },
{ &hf_netmon_802_11_flags, { "Flags", "netmon_802_11.flags", FT_UINT32,
BASE_HEX, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_phy_type, { "PHY type", "netmon_802_11.phy_type", FT_UINT32,
BASE_DEC, VALS(phy_type), 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_channel, { "Channel", "netmon_802_11.channel", FT_UINT32,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_frequency, { "Center frequency", "netmon_802_11.frequency", FT_UINT32,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_rssi, { "RSSI", "netmon_802_11.rssi", FT_INT32,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
{ &hf_netmon_802_11_datarate, { "Data rate", "netmon_802_11.datarate", FT_UINT32,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
/*
* XXX - is this host, or MAC, time stamp?
* It might be a FILETIME.
*/
{ &hf_netmon_802_11_timestamp, { "Timestamp", "netmon_802_11.timestamp", FT_UINT64,
BASE_DEC, NULL, 0x0, NULL, HFILL } },
};
static gint *ett[] = {
&ett_netmon_802_11,
&ett_netmon_802_11_op_mode
};
proto_netmon_802_11 = proto_register_protocol("NetMon 802.11 capture header",
"NetMon 802.11",
"netmon_802_11");
proto_register_field_array(proto_netmon_802_11, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_netmon_802_11(void)
{
dissector_handle_t netmon_802_11_handle;
/* handle for 802.11 dissector */
ieee80211_handle = find_dissector("wlan");
netmon_802_11_handle = new_create_dissector_handle(dissect_netmon_802_11,
proto_netmon_802_11);
dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_NETMON, netmon_802_11_handle);
}
|
