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/* packet-ieee80211-radio.c
* Routines for pseudo 802.11 header dissection
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include "packet-ieee80211.h"
static dissector_handle_t ieee80211_handle;
static int proto_radio = -1;
/* ************************************************************************* */
/* Header field info values for radio information */
/* ************************************************************************* */
static int hf_data_rate = -1;
static int hf_channel = -1;
static int hf_signal_strength = -1;
static gint ett_radio = -1;
/*
* Dissect 802.11 with a variable-length link-layer header and a pseudo-
* header containing radio information.
*/
static void
dissect_radio (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
proto_item *ti = NULL;
proto_tree *radio_tree = NULL;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Radio");
col_clear(pinfo->cinfo, COL_INFO);
/* Add the radio information to the column information */
col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%u.%u",
pinfo->pseudo_header->ieee_802_11.data_rate / 2,
pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
/*
* For tagged Peek files, this is presumably signal strength as a
* percentage of the maximum, as it is for classic Peek files,
* i.e. (RXVECTOR RSSI/RXVECTOR RSSI_Max)*100, or, at least, that's
* what I infer it is, given what the WildPackets note "Converting
* Signal Strength Percentage to dBm Values" says.
*
* It also says that the conversion the percentage to a dBm value is
* an adapter-dependent process, so, as we don't know what type of
* adapter was used to do the capture, we can't do the conversion.
*
* It's *probably* something similar for other capture file formats.
*/
col_add_fstr(pinfo->cinfo, COL_RSSI, "%u%%",
pinfo->pseudo_header->ieee_802_11.signal_level);
if (tree) {
ti = proto_tree_add_item(tree, proto_radio, tvb, 0, 0, ENC_NA);
radio_tree = proto_item_add_subtree (ti, ett_radio);
proto_tree_add_uint64_format_value(radio_tree, hf_data_rate, tvb, 0, 0,
(guint64)pinfo->pseudo_header->ieee_802_11.data_rate * 500000,
"%u.%u Mb/s",
pinfo->pseudo_header->ieee_802_11.data_rate / 2,
pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
proto_tree_add_uint(radio_tree, hf_channel, tvb, 0, 0,
pinfo->pseudo_header->ieee_802_11.channel);
proto_tree_add_uint_format_value(radio_tree, hf_signal_strength, tvb, 0, 0,
pinfo->pseudo_header->ieee_802_11.signal_level,
"%u%%",
pinfo->pseudo_header->ieee_802_11.signal_level);
}
/* dissect the 802.11 header next */
pinfo->current_proto = "IEEE 802.11";
call_dissector(ieee80211_handle, tvb, pinfo, tree);
}
static hf_register_info hf_radio[] = {
{&hf_data_rate,
{"Data Rate", "wlan.data_rate", FT_UINT64, BASE_DEC, NULL, 0,
"Data rate (b/s)", HFILL }},
{&hf_channel,
{"Channel", "wlan.channel", FT_UINT8, BASE_DEC, NULL, 0,
"802.11 channel number that this frame was sent/received on", HFILL }},
{&hf_signal_strength,
{"Signal Strength", "wlan.signal_strength", FT_UINT8, BASE_DEC, NULL, 0,
"Signal strength (Percentage)", HFILL }}
};
static gint *tree_array[] = {
&ett_radio
};
void proto_register_ieee80211_radio(void)
{
proto_radio = proto_register_protocol("802.11 radio information", "Radio",
"radio");
proto_register_field_array(proto_radio, hf_radio, array_length(hf_radio));
proto_register_subtree_array(tree_array, array_length(tree_array));
}
void proto_reg_handoff_ieee80211_radio(void)
{
dissector_handle_t radio_handle;
/* Register handoff to radio-header dissectors */
radio_handle = create_dissector_handle(dissect_radio, proto_radio);
dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
radio_handle);
ieee80211_handle = find_dissector("wlan");
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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