151 lines
5 KiB
C
151 lines
5 KiB
C
/* packet-ieee80211-radio.c
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* Routines for pseudo 802.11 header dissection
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from README.developer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-ieee80211.h"
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static dissector_handle_t ieee80211_handle;
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static int proto_radio = -1;
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/* ************************************************************************* */
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/* Header field info values for radio information */
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/* ************************************************************************* */
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static int hf_data_rate = -1;
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static int hf_channel = -1;
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static int hf_signal_strength = -1;
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static gint ett_radio = -1;
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/*
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* Dissect 802.11 with a variable-length link-layer header and a pseudo-
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* header containing radio information.
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*/
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static void
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dissect_radio (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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proto_item *ti = NULL;
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proto_tree *radio_tree = NULL;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Radio");
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col_clear(pinfo->cinfo, COL_INFO);
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/* Add the radio information to the column information */
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col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%u.%u",
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pinfo->pseudo_header->ieee_802_11.data_rate / 2,
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pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
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/*
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* For tagged Peek files, this is presumably signal strength as a
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* percentage of the maximum, as it is for classic Peek files,
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* i.e. (RXVECTOR RSSI/RXVECTOR RSSI_Max)*100, or, at least, that's
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* what I infer it is, given what the WildPackets note "Converting
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* Signal Strength Percentage to dBm Values" says.
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*
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* It also says that the conversion the percentage to a dBm value is
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* an adapter-dependent process, so, as we don't know what type of
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* adapter was used to do the capture, we can't do the conversion.
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*
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* It's *probably* something similar for other capture file formats.
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*/
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col_add_fstr(pinfo->cinfo, COL_RSSI, "%u%%",
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pinfo->pseudo_header->ieee_802_11.signal_level);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_radio, tvb, 0, 0, ENC_NA);
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radio_tree = proto_item_add_subtree (ti, ett_radio);
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proto_tree_add_uint64_format_value(radio_tree, hf_data_rate, tvb, 0, 0,
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(guint64)pinfo->pseudo_header->ieee_802_11.data_rate * 500000,
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"%u.%u Mb/s",
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pinfo->pseudo_header->ieee_802_11.data_rate / 2,
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pinfo->pseudo_header->ieee_802_11.data_rate & 1 ? 5 : 0);
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proto_tree_add_uint(radio_tree, hf_channel, tvb, 0, 0,
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pinfo->pseudo_header->ieee_802_11.channel);
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proto_tree_add_uint_format_value(radio_tree, hf_signal_strength, tvb, 0, 0,
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pinfo->pseudo_header->ieee_802_11.signal_level,
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"%u%%",
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pinfo->pseudo_header->ieee_802_11.signal_level);
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}
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/* dissect the 802.11 header next */
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pinfo->current_proto = "IEEE 802.11";
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call_dissector(ieee80211_handle, tvb, pinfo, tree);
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}
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static hf_register_info hf_radio[] = {
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{&hf_data_rate,
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{"Data Rate", "wlan.data_rate", FT_UINT64, BASE_DEC, NULL, 0,
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"Data rate (b/s)", HFILL }},
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{&hf_channel,
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{"Channel", "wlan.channel", FT_UINT8, BASE_DEC, NULL, 0,
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"802.11 channel number that this frame was sent/received on", HFILL }},
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{&hf_signal_strength,
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{"Signal Strength", "wlan.signal_strength", FT_UINT8, BASE_DEC, NULL, 0,
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"Signal strength (Percentage)", HFILL }}
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};
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static gint *tree_array[] = {
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&ett_radio
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};
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void proto_register_ieee80211_radio(void)
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{
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proto_radio = proto_register_protocol("802.11 radio information", "Radio",
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"radio");
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proto_register_field_array(proto_radio, hf_radio, array_length(hf_radio));
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proto_register_subtree_array(tree_array, array_length(tree_array));
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}
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void proto_reg_handoff_ieee80211_radio(void)
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{
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dissector_handle_t radio_handle;
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/* Register handoff to radio-header dissectors */
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radio_handle = create_dissector_handle(dissect_radio, proto_radio);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
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radio_handle);
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ieee80211_handle = find_dissector("wlan");
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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