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wireshark/epan/dissectors/packet-ieee80211-netmon.c

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/*
* packet-ieee80211-netmon.c
* Decode packets with a Network Monitor 802.11 radio header
*
* 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.
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_netmon_802_11(void);
void proto_reg_handoff_netmon_802_11(void);
/* 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, void *data _U_)
{
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 } },
#if 0
{ &hf_netmon_802_11_flags, { "Flags", "netmon_802_11.flags", FT_UINT32,
BASE_HEX, NULL, 0x0, NULL, HFILL } },
#endif
{ &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);
}
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