aboutsummaryrefslogtreecommitdiffstats
path: root/packet-wlancap.c
blob: f0ce9c3af0a81a29a74d077fedde2b1f80518f0f (plain)
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
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/*
 *  packet-wlancap.c
 *	Decode packets with a AVS-WLAN header
 *
 *  AVS linux-wlan-based products use a new sniff header to replace the 
 *  old prism2-specific one dissected in packet-prism2.c.  This one has
 *  additional fields, is designed to be non-hardware-specific, and more 
 *  importantly, version and length fields so it can be extended later 
 *  without breaking anything.
 *
 *  See
 *
 *	http://www.shaftnet.org/~pizza/software/capturefrm.txt
 * 
 * By Solomon Peachy
 *
 * $Id: packet-wlancap.c,v 1.6 2004/07/06 19:22:45 guy Exp $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * Copied from README.developer
 *
 * 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 <glib.h>
#include <string.h>

#include <epan/packet.h>
#include "packet-ieee80211.h"
#include "packet-wlancap.h"

#define SHORT_STR 256

/* protocol */
static int proto_wlancap = -1;

/* header attached during wlan monitor mode */
struct wlan_header_v1 {
  guint32 version;
  guint32 length;
  guint64 mactime;
  guint64 hosttime;
  guint32 phytype;
  guint32 channel;
  guint32 datarate;
  guint32 antenna;
  guint32 priority;
  guint32 ssi_type;
  gint32 ssi_signal;
  gint32 ssi_noise;
  gint32 preamble;
  gint32 encoding;
};

static int hf_wlan_version = -1;
static int hf_wlan_length = -1;
static int hf_wlan_mactime = -1;
static int hf_wlan_hosttime = -1;
static int hf_wlan_phytype = -1;
static int hf_wlan_channel = -1;
static int hf_wlan_datarate = -1;
static int hf_wlan_antenna = -1;
static int hf_wlan_priority = -1;
static int hf_wlan_ssi_type = -1;
static int hf_wlan_ssi_signal = -1;
static int hf_wlan_ssi_noise = -1;
static int hf_wlan_preamble = -1;
static int hf_wlan_encoding = -1;

static gint ett_wlan = -1;

static dissector_handle_t ieee80211_handle;

static void
dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

void
capture_wlancap(const guchar *pd, int offset, int len, packet_counts *ld)
{
    /* XXX eventually add in a version test. */
    if(!BYTES_ARE_IN_FRAME(offset, len, (int)sizeof(struct wlan_header_v1))) {
        ld->other ++;
        return;
    }
    offset += sizeof(struct wlan_header_v1);

    /* 802.11 header follows */
    capture_ieee80211(pd, offset, len, ld);
}

void
proto_register_wlancap(void)
{

  static const value_string phy_type[] = {
    { 0, "Unknown" },
    { 1, "FHSS 802.11 '97" },
    { 2, "DSSS 802.11 '97" }, 
    { 3, "IR Baseband" },
    { 4, "DSSS 802.11b" },
    { 5, "PBCC 802.11b" }, 
    { 6, "OFDM 802.11g" },
    { 7, "PBCC 802.11g" },
    { 8, "OFDM 802.11a" },
    { 0, NULL },
  };

  static const value_string encoding_type[] = {
    { 0, "Unknown" },
    { 1, "CCK" },
    { 2, "PBCC" },
    { 3, "OFDM" },
    { 0, NULL },
  };

  static const value_string ssi_type[] = {
    { 0, "None" },
    { 1, "Normalized RSSI" },
    { 2, "dBm" },
    { 3, "Raw RSSI" },
    { 0, NULL },
  };

  static const value_string preamble_type[] = {
    { 0, "Unknown" },
    { 1, "Short" },
    { 2, "Long" },
    { 0, NULL },
  };

  static hf_register_info hf[] = {
    { &hf_wlan_version, { "Header revision", "wlancap.version", FT_UINT32, 
			  BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_length, { "Header length", "wlancap.length", FT_UINT32, 
			 BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_mactime, { "MAC timestamp", "wlancap.mactime", FT_UINT64, 
			  BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_hosttime, { "Host timestamp", "wlancap.hosttime", FT_UINT64, 
			   BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_phytype, { "PHY type", "wlancap.phytype", FT_UINT32, BASE_DEC,
			  VALS(phy_type), 0x0, "", HFILL } },
    { &hf_wlan_channel, { "Channel", "wlancap.channel", FT_UINT32, BASE_DEC,
			  NULL, 0x0, "", HFILL } },
    { &hf_wlan_datarate, { "Data rate", "wlancap.datarate", FT_UINT32, 
			   BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_antenna, { "Antenna", "wlancap.antenna", FT_UINT32, BASE_DEC,
			  NULL, 0x0, "", HFILL } },
    { &hf_wlan_priority, { "Priority", "wlancap.priority", FT_UINT32, BASE_DEC,
			   NULL, 0x0, "", HFILL } },
    { &hf_wlan_ssi_type, { "SSI Type", "wlancap.ssi_type", FT_UINT32, BASE_DEC,
			   VALS(ssi_type), 0x0, "", HFILL } },
    { &hf_wlan_ssi_signal, { "SSI Signal", "wlancap.ssi_signal", FT_INT32, 
			     BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_ssi_noise, { "SSI Noise", "wlancap.ssi_noise", FT_INT32, 
			    BASE_DEC, NULL, 0x0, "", HFILL } },
    { &hf_wlan_preamble, { "Preamble", "wlancap.preamble", FT_UINT32, 
			   BASE_DEC, VALS(preamble_type), 0x0, "", HFILL } },
    { &hf_wlan_encoding, { "Encoding Type", "wlancap.encoding", FT_UINT32, 
			   BASE_DEC, VALS(encoding_type), 0x0, "", HFILL } },
  };
  static gint *ett[] = {
    &ett_wlan
  };

  proto_wlancap = proto_register_protocol("AVS WLAN Capture header", "AVS WLANCAP", "wlancap");
  proto_register_field_array(proto_wlancap, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
  register_dissector("wlancap", dissect_wlancap, proto_wlancap);

}

static void
dissect_wlancap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    proto_tree *wlan_tree;
    proto_item *ti;
    tvbuff_t *next_tvb;
    int offset;
    guint32 version;
    guint32 length;
    guint32 datarate;

    if(check_col(pinfo->cinfo, COL_PROTOCOL))
        col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN");
    if(check_col(pinfo->cinfo, COL_INFO))
        col_clear(pinfo->cinfo, COL_INFO);
    offset = 0;

    version = tvb_get_ntohl(tvb, offset) - WLANCAP_MAGIC_COOKIE_BASE;
    length = tvb_get_ntohl(tvb, offset+4);

    if(check_col(pinfo->cinfo, COL_INFO))
        col_add_fstr(pinfo->cinfo, COL_INFO, "AVS WLAN Capture v%x, Length %d",version, length);

    if (check_col(pinfo->cinfo, COL_TX_RATE)) {
      guint32 txrate = tvb_get_ntohl(tvb, offset + 32);
      col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%d.%d",
		   txrate / 10, txrate % 10);
    }
    if (check_col(pinfo->cinfo, COL_RSSI)) {
      /* XXX cook ssi_signal (Based on type; ie format) */
      col_add_fstr(pinfo->cinfo, COL_RSSI, "%d",
		   tvb_get_ntohl(tvb, offset + 48));
    }

    /* Dissect the packet */
    if (tree) {
      ti = proto_tree_add_protocol_format(tree, proto_wlancap,
            tvb, 0, length, "AVS WLAN Monitoring Header");
      wlan_tree = proto_item_add_subtree(ti, ett_wlan);
      proto_tree_add_uint(wlan_tree, hf_wlan_version, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset) - WLANCAP_MAGIC_COOKIE_BASE);
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_length, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      proto_tree_add_item(wlan_tree, hf_wlan_mactime, tvb, offset,
			  8, FALSE);
      offset+=8;
      proto_tree_add_item(wlan_tree, hf_wlan_hosttime, tvb, offset,
			  8, FALSE);
      offset+=8;

      proto_tree_add_uint(wlan_tree, hf_wlan_phytype, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      /* XXX cook channel (fh uses different numbers) */
      proto_tree_add_uint(wlan_tree, hf_wlan_channel, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;

      /* XXX - all other 802.11 pseudo-headers use 500Kb/s, not 100Kb/s,
         as the units. */
      datarate = tvb_get_ntohl(tvb, offset);
      proto_tree_add_uint_format(wlan_tree, hf_wlan_datarate, tvb, offset, 
				 4, datarate * 100, 
				 "Data Rate: %u Kb/s", datarate * 100);
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_antenna, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_priority, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_ssi_type, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      /* XXX cook ssi_signal (Based on type; ie format) */
      proto_tree_add_int(wlan_tree, hf_wlan_ssi_signal, tvb, offset,
			 4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      /* XXX cook ssi_noise (Based on type; ie format) */
      proto_tree_add_int(wlan_tree, hf_wlan_ssi_noise, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_preamble, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
      proto_tree_add_uint(wlan_tree, hf_wlan_encoding, tvb, offset,
			  4, tvb_get_ntohl(tvb, offset));
      offset+=4;
    }

    if (offset == 0)
      offset = length;

    /* dissect the 802.11 header next */
    next_tvb = tvb_new_subset(tvb, offset, -1, -1);
    call_dissector(ieee80211_handle, next_tvb, pinfo, tree);
}

void
proto_reg_handoff_wlancap(void)
{
    dissector_handle_t wlancap_handle;

    /* handle for 802.11 dissector */
    ieee80211_handle = find_dissector("wlan");

    wlancap_handle = create_dissector_handle(dissect_wlancap, proto_wlancap);

    dissector_add("wtap_encap", WTAP_ENCAP_IEEE_802_11_WLAN_AVS, wlancap_handle);
}