forked from osmocom/wireshark
e6ca1b50a0
more natural. svn path=/trunk/; revision=15588
521 lines
16 KiB
C
521 lines
16 KiB
C
/*
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* packet-radiotap.c
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* Decode packets with a Radiotap header
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <string.h>
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#include <epan/packet.h>
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#include "packet-ieee80211.h"
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#include "packet-radiotap.h"
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struct ieee80211_radiotap_header {
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guint8 it_version; /* Version 0. Only increases
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* for drastic changes,
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* introduction of compatible
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* new fields does not count.
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*/
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guint8 it_pad;
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guint16 it_len; /* length of the whole
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* header in bytes, including
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* it_version, it_pad,
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* it_len, and data fields.
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*/
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#define MAX_PRESENT 1
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guint32 it_present[MAX_PRESENT]; /* A bitmap telling which
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* fields are present. Set bit 31
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* (0x80000000) to extend the
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* bitmap by another 32 bits.
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* Additional extensions are made
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* by setting bit 31.
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*/
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};
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enum ieee80211_radiotap_type {
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IEEE80211_RADIOTAP_TSFT = 0,
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IEEE80211_RADIOTAP_FLAGS = 1,
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IEEE80211_RADIOTAP_RATE = 2,
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IEEE80211_RADIOTAP_CHANNEL = 3,
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IEEE80211_RADIOTAP_FHSS = 4,
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IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
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IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
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IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
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IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
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IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
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IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
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IEEE80211_RADIOTAP_ANTENNA = 11,
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IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
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IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
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IEEE80211_RADIOTAP_FCS = 14,
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IEEE80211_RADIOTAP_EXT = 31
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};
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/* Channel flags. */
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#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
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#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
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#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
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#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
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#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
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#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
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#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
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#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
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/*
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* Useful combinations of channel characteristics.
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*/
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#define IEEE80211_CHAN_FHSS \
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(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_GFSK)
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#define IEEE80211_CHAN_A \
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(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM)
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#define IEEE80211_CHAN_B \
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(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK)
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#define IEEE80211_CHAN_PUREG \
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(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_OFDM)
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#define IEEE80211_CHAN_G \
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(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN)
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#define IEEE80211_CHAN_T \
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(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO)
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#define IEEE80211_CHAN_108G \
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(IEEE80211_CHAN_G | IEEE80211_CHAN_TURBO)
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#define IEEE80211_CHAN_108PUREG \
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(IEEE80211_CHAN_PUREG | IEEE80211_CHAN_TURBO)
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/* For IEEE80211_RADIOTAP_FLAGS */
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#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
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* during CFP
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*/
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#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
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* with short
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* preamble
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*/
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#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
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* with WEP encryption
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*/
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#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
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* with fragmentation
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*/
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/* protocol */
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static int proto_radiotap = -1;
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static int hf_radiotap_version = -1;
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static int hf_radiotap_pad = -1;
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static int hf_radiotap_length = -1;
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static int hf_radiotap_present1 = -1;
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static int hf_radiotap_mactime = -1;
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static int hf_radiotap_channel_frequency = -1;
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static int hf_radiotap_channel_flags = -1;
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static int hf_radiotap_datarate = -1;
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static int hf_radiotap_antenna = -1;
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static int hf_radiotap_dbm_antsignal = -1;
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static int hf_radiotap_db_antsignal = -1;
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static int hf_radiotap_dbm_antnoise = -1;
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static int hf_radiotap_db_antnoise = -1;
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static int hf_radiotap_txpower = -1;
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static int hf_radiotap_preamble = -1;
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static gint ett_radiotap = -1;
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static gint ett_radiotap_present = -1;
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static dissector_handle_t ieee80211_handle;
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static void
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dissect_radiotap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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void
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capture_radiotap(const guchar *pd, int offset, int len, packet_counts *ld)
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{
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const struct ieee80211_radiotap_header *hdr;
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if(!BYTES_ARE_IN_FRAME(offset, len, (int)sizeof(*hdr))) {
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ld->other ++;
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return;
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}
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hdr = (const struct ieee80211_radiotap_header *)pd;
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if(!BYTES_ARE_IN_FRAME(offset, len, hdr->it_len)) {
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ld->other ++;
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return;
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}
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/* 802.11 header follows */
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capture_ieee80211(pd, offset + hdr->it_len, len, ld);
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}
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void
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proto_register_radiotap(void)
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{
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static const value_string phy_type[] = {
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{ 0, "Unknown" },
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{ IEEE80211_CHAN_A, "802.11a" },
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{ IEEE80211_CHAN_B, "802.11b" },
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{ IEEE80211_CHAN_PUREG, "802.11g (pure-g)" },
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{ IEEE80211_CHAN_G, "802.11g" },
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{ IEEE80211_CHAN_T, "802.11a (turbo)" },
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{ IEEE80211_CHAN_108PUREG, "802.11g (pure-g, turbo)" },
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{ IEEE80211_CHAN_108G, "802.11g (turbo)" },
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{ IEEE80211_CHAN_FHSS, "FHSS" },
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{ 0, NULL },
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};
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static const value_string preamble_type[] = {
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{ 0, "Long" },
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{ 1, "Short" },
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{ 0, NULL },
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};
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static hf_register_info hf[] = {
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{ &hf_radiotap_version,
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{ "Header revision", "radiotap.version",
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FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_pad,
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{ "Header pad", "radiotap.pad",
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FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_length,
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{ "Header length", "radiotap.length",
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FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_present1,
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{ "Present elements", "radiotap.present",
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FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_preamble,
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{ "Preamble", "radiotap.flags.preamble",
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FT_UINT32, BASE_DEC, VALS(preamble_type), 0x0, "", HFILL } },
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{ &hf_radiotap_mactime,
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{ "MAC timestamp", "radiotap.mactime",
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FT_UINT64, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_channel_frequency,
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{ "Channel frequency", "radiotap.channel.freq",
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FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_channel_flags,
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{ "Channel type", "radiotap.channel.flags",
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FT_UINT16, BASE_HEX, VALS(phy_type), 0x0, "", HFILL } },
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{ &hf_radiotap_datarate,
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{ "Data rate", "radiotap.datarate",
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FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_antenna,
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{ "Antenna", "radiotap.antenna",
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FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_dbm_antsignal,
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{ "SSI Signal (dBm)", "radiotap.dbm_antsignal",
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FT_INT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_db_antsignal,
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{ "SSI Signal (dB)", "radiotap.db_antsignal",
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FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_dbm_antnoise,
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{ "SSI Noise (dBm)", "radiotap.dbm_antnoise",
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FT_INT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_db_antnoise,
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{ "SSI Noise (dB)", "radiotap.db_antnoise",
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FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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{ &hf_radiotap_txpower,
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{ "Transmit power", "radiotap.txpower",
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FT_INT32, BASE_DEC, NULL, 0x0, "", HFILL } },
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};
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static gint *ett[] = {
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&ett_radiotap,
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&ett_radiotap_present
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};
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proto_radiotap = proto_register_protocol("IEEE 802.11 Radiotap Capture header", "802.11 Radiotap", "radiotap");
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proto_register_field_array(proto_radiotap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("radiotap", dissect_radiotap, proto_radiotap);
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}
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/*
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* Convert MHz frequency to IEEE channel number.
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*/
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static int
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ieee80211_mhz2ieee(int freq, int flags)
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{
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if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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else
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return 15 + ((freq - 2512) / 20);
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} else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
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return (freq - 5000) / 5;
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} else { /* either, guess */
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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if (freq < 5000)
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return 15 + ((freq - 2512) / 20);
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return (freq - 5000) / 5;
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}
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}
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static void
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dissect_radiotap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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#define BITNO_32(x) (((x) >> 16) ? 16 + BITNO_16((x) >> 16) : BITNO_16((x)))
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#define BITNO_16(x) (((x) >> 8) ? 8 + BITNO_8((x) >> 8) : BITNO_8((x)))
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#define BITNO_8(x) (((x) >> 4) ? 4 + BITNO_4((x) >> 4) : BITNO_4((x)))
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#define BITNO_4(x) (((x) >> 2) ? 2 + BITNO_2((x) >> 2) : BITNO_2((x)))
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#define BITNO_2(x) (((x) & 2) ? 1 : 0)
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#define BIT(n) (1 << n)
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proto_tree *radiotap_tree = NULL;
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proto_tree *pt, *present_tree;
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proto_item *ti;
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int offset;
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guint32 version, pad;
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guint32 length;
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guint32 rate, freq, flags;
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gint8 dbm;
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guint8 db;
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guint32 present, next_present;
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int bit;
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if(check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN");
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if(check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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offset = 0;
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version = tvb_get_guint8(tvb, offset);
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pad = tvb_get_guint8(tvb, offset+1);
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length = tvb_get_letohs(tvb, offset+2);
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present = tvb_get_letohl(tvb, offset+4);
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if(check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Radiotap Capture v%u, Length %u",
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version, length);
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/* Dissect the packet */
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_radiotap,
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tvb, 0, length, "Radiotap Header v%u, Length %u", version, length);
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radiotap_tree = proto_item_add_subtree(ti, ett_radiotap);
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proto_tree_add_uint(radiotap_tree, hf_radiotap_version,
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tvb, offset, 1, version);
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proto_tree_add_uint(radiotap_tree, hf_radiotap_pad,
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tvb, offset + 1, 1, pad);
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proto_tree_add_uint(radiotap_tree, hf_radiotap_length,
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tvb, offset + 2, 2, length);
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pt = proto_tree_add_uint_format(radiotap_tree, hf_radiotap_present1,
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tvb, offset + 4, 4, present, "Present flags (0x%08x)", present);
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present_tree = proto_item_add_subtree(pt, ett_radiotap_present);
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}
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/*
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* FIXME: This only works if there is exactly 1 it_present
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* field in the header
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*/
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offset += sizeof(struct ieee80211_radiotap_header);
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for (; present; present = next_present) {
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/* clear the least significant bit that is set */
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next_present = present & (present - 1);
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/* extract the least significant bit that is set */
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bit = BITNO_32(present ^ next_present);
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switch (bit) {
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case IEEE80211_RADIOTAP_FLAGS:
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if (tree) {
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proto_tree_add_uint(radiotap_tree, hf_radiotap_preamble,
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tvb, 0, 0, (tvb_get_guint8(tvb, offset) &
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IEEE80211_RADIOTAP_F_SHORTPRE) != 0);
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}
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offset++;
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/* XXX CFP, WEP, FRAG */
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#if 0
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capability = tvb_get_letohs (tvb, offset);
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cap_item = proto_tree_add_uint_format (tree, ff_capture,
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tvb, offset, 2,
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capability,
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"Capability Information: 0x%04X",
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capability);
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cap_tree = proto_item_add_subtree (cap_item, ett_cap_tree);
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proto_tree_add_boolean (cap_tree, ff_cf_ess, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_cf_ibss, tvb, offset, 2,
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capability);
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if (ESS_SET (capability) != 0) /* This is an AP */
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proto_tree_add_uint (cap_tree, ff_cf_ap_poll, tvb, offset, 2,
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capability);
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else /* This is a STA */
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proto_tree_add_uint (cap_tree, ff_cf_sta_poll, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_cf_privacy, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_cf_preamble, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_cf_pbcc, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_cf_agility, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_short_slot_time, tvb, offset, 2,
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capability);
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proto_tree_add_boolean (cap_tree, ff_dsss_ofdm, tvb, offset, 2,
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capability);
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#endif
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break;
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case IEEE80211_RADIOTAP_RATE:
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rate = tvb_get_guint8(tvb, offset) & 0x7f;
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if (check_col(pinfo->cinfo, COL_TX_RATE)) {
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col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%d.%d",
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rate / 2, rate & 1 ? 5 : 0);
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}
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if (tree) {
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proto_tree_add_uint_format(radiotap_tree, hf_radiotap_datarate,
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tvb, offset, 1, tvb_get_guint8(tvb, offset),
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"Data Rate: %d.%d Mb/s", rate / 2, rate & 1 ? 5 : 0);
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}
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offset++;
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break;
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case IEEE80211_RADIOTAP_DBM_ANTSIGNAL:
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dbm = (gint8) tvb_get_guint8(tvb, offset);
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if (check_col(pinfo->cinfo, COL_RSSI)) {
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col_add_fstr(pinfo->cinfo, COL_RSSI, "%d dBm", dbm);
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}
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if (tree) {
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proto_tree_add_int_format(radiotap_tree,
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hf_radiotap_dbm_antsignal,
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tvb, offset, 1, dbm,
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"SSI Signal: %d dBm", dbm);
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}
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offset++;
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break;
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case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
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db = tvb_get_guint8(tvb, offset);
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if (check_col(pinfo->cinfo, COL_RSSI)) {
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col_add_fstr(pinfo->cinfo, COL_RSSI, "%u dB", db);
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}
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if (tree) {
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proto_tree_add_uint_format(radiotap_tree,
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hf_radiotap_db_antsignal,
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tvb, offset, 1, db,
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"SSI Signal: %u dB", db);
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}
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offset++;
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break;
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case IEEE80211_RADIOTAP_DBM_ANTNOISE:
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dbm = (gint8) tvb_get_guint8(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_int_format(radiotap_tree,
|
|
hf_radiotap_dbm_antnoise,
|
|
tvb, offset, 1, dbm,
|
|
"SSI Noise: %d dBm", dbm);
|
|
}
|
|
offset++;
|
|
break;
|
|
case IEEE80211_RADIOTAP_DB_ANTNOISE:
|
|
db = tvb_get_guint8(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_uint_format(radiotap_tree,
|
|
hf_radiotap_db_antnoise,
|
|
tvb, offset, 1, db,
|
|
"SSI Noise: %u dB", db);
|
|
}
|
|
offset++;
|
|
break;
|
|
case IEEE80211_RADIOTAP_ANTENNA:
|
|
if (tree) {
|
|
proto_tree_add_uint(radiotap_tree, hf_radiotap_antenna,
|
|
tvb, offset, 1, tvb_get_guint8(tvb, offset));
|
|
}
|
|
offset++;
|
|
break;
|
|
case IEEE80211_RADIOTAP_DBM_TX_POWER:
|
|
if (tree) {
|
|
proto_tree_add_int(radiotap_tree, hf_radiotap_txpower,
|
|
tvb, offset, 1, tvb_get_guint8(tvb, offset));
|
|
}
|
|
offset++;
|
|
break;
|
|
case IEEE80211_RADIOTAP_CHANNEL:
|
|
if (tree) {
|
|
freq = tvb_get_letohs(tvb, offset);
|
|
flags = tvb_get_letohs(tvb, offset+2);
|
|
proto_tree_add_uint_format(radiotap_tree, hf_radiotap_channel_frequency,
|
|
tvb, offset, 2, freq,
|
|
"Channel: %u (chan %u)", freq, ieee80211_mhz2ieee(freq, flags));
|
|
proto_tree_add_uint(radiotap_tree, hf_radiotap_channel_flags,
|
|
tvb, offset+2, 2, flags);
|
|
}
|
|
offset+=4;
|
|
break;
|
|
case IEEE80211_RADIOTAP_FHSS:
|
|
case IEEE80211_RADIOTAP_LOCK_QUALITY:
|
|
case IEEE80211_RADIOTAP_TX_ATTENUATION:
|
|
case IEEE80211_RADIOTAP_DB_TX_ATTENUATION:
|
|
#if 0
|
|
tvb_get_letohs(tvb, offset);
|
|
#endif
|
|
offset+=2;
|
|
break;
|
|
case IEEE80211_RADIOTAP_TSFT:
|
|
if (tree) {
|
|
proto_tree_add_item(radiotap_tree, hf_radiotap_mactime,
|
|
tvb, offset, 8, FALSE);
|
|
}
|
|
offset+=8;
|
|
break;
|
|
default:
|
|
/*
|
|
* This indicates a field whose size we do not
|
|
* know, so we cannot proceed.
|
|
*/
|
|
next_present = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* dissect the 802.11 header next */
|
|
call_dissector(ieee80211_handle,
|
|
tvb_new_subset(tvb, length, -1, -1), pinfo, tree);
|
|
#undef BITNO_32
|
|
#undef BITNO_16
|
|
#undef BITNO_8
|
|
#undef BITNO_4
|
|
#undef BITNO_2
|
|
#undef BIT
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_radiotap(void)
|
|
{
|
|
dissector_handle_t radiotap_handle;
|
|
|
|
/* handle for 802.11 dissector */
|
|
ieee80211_handle = find_dissector("wlan");
|
|
|
|
radiotap_handle = create_dissector_handle(dissect_radiotap, proto_radiotap);
|
|
|
|
dissector_add("wtap_encap", WTAP_ENCAP_IEEE_802_11_WLAN_RADIOTAP, radiotap_handle);
|
|
}
|