diff options
Diffstat (limited to 'epan/dissectors/packet-ieee80211-radiotap.c')
| -rw-r--r-- | epan/dissectors/packet-ieee80211-radiotap.c | 2137 |
1 files changed, 2137 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ieee80211-radiotap.c b/epan/dissectors/packet-ieee80211-radiotap.c new file mode 100644 index 0000000000..3ec6efdfb3 --- /dev/null +++ b/epan/dissectors/packet-ieee80211-radiotap.c @@ -0,0 +1,2137 @@ +/* + * packet-ieee80211-radiotap.c + * Decode packets with a Radiotap header + * + * $Id$ + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <glib.h> +#include <errno.h> + +#include <epan/packet.h> +#include <epan/crc32-tvb.h> +#include <epan/frequency-utils.h> +#include <epan/tap.h> +#include <epan/prefs.h> +#include <epan/addr_resolv.h> +#include "packet-ieee80211.h" +#include "packet-ieee80211-radiotap.h" +#include "packet-ieee80211-radiotap-iter.h" +#include "packet-ieee80211-radiotap-defs.h" + +/* not officially defined (yet) */ +#define IEEE80211_RADIOTAP_F_SHORTGI 0x80 +#define IEEE80211_RADIOTAP_XCHANNEL 18 +#define IEEE80211_CHAN_HT20 0x10000 /* HT 20 channel */ +#define IEEE80211_CHAN_HT40U 0x20000 /* HT 40 channel w/ ext above */ +#define IEEE80211_CHAN_HT40D 0x40000 /* HT 40 channel w/ ext below */ + +/* Official specifcation: + * + * http://www.radiotap.org/ + * + * Unofficial and historical specifications: + * http://madwifi-project.org/wiki/DevDocs/RadiotapHeader + * NetBSD's ieee80211_radiotap.h file + */ + +/* + * Useful combinations of channel characteristics. + */ +#define IEEE80211_CHAN_FHSS \ + (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_GFSK) +#define IEEE80211_CHAN_A \ + (IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM) +#define IEEE80211_CHAN_B \ + (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK) +#define IEEE80211_CHAN_PUREG \ + (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_OFDM) +#define IEEE80211_CHAN_G \ + (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN) +#define IEEE80211_CHAN_T \ + (IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO) +#define IEEE80211_CHAN_108G \ + (IEEE80211_CHAN_G | IEEE80211_CHAN_TURBO) +#define IEEE80211_CHAN_108PUREG \ + (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_TURBO) + +#define MAX_MCS_INDEX 76 + +/* + * Indices are: + * + * the MCS index (0-76); + * + * 0 for 20 MHz, 1 for 40 MHz; + * + * 0 for a long guard interval, 1 for a short guard interval. + */ +static const float ieee80211_float_htrates[MAX_MCS_INDEX+1][2][2] = { + /* MCS 0 */ + { /* 20 Mhz */ { 6.5f, /* SGI */ 7.2f, }, + /* 40 Mhz */ { 13.5f, /* SGI */ 15.0f, }, + }, + + /* MCS 1 */ + { /* 20 Mhz */ { 13.0f, /* SGI */ 14.4f, }, + /* 40 Mhz */ { 27.0f, /* SGI */ 30.0f, }, + }, + + /* MCS 2 */ + { /* 20 Mhz */ { 19.5f, /* SGI */ 21.7f, }, + /* 40 Mhz */ { 40.5f, /* SGI */ 45.0f, }, + }, + + /* MCS 3 */ + { /* 20 Mhz */ { 26.0f, /* SGI */ 28.9f, }, + /* 40 Mhz */ { 54.0f, /* SGI */ 60.0f, }, + }, + + /* MCS 4 */ + { /* 20 Mhz */ { 39.0f, /* SGI */ 43.3f, }, + /* 40 Mhz */ { 81.0f, /* SGI */ 90.0f, }, + }, + + /* MCS 5 */ + { /* 20 Mhz */ { 52.0f, /* SGI */ 57.8f, }, + /* 40 Mhz */ { 108.0f, /* SGI */ 120.0f, }, + }, + + /* MCS 6 */ + { /* 20 Mhz */ { 58.5f, /* SGI */ 65.0f, }, + /* 40 Mhz */ { 121.5f, /* SGI */ 135.0f, }, + }, + + /* MCS 7 */ + { /* 20 Mhz */ { 65.0f, /* SGI */ 72.2f, }, + /* 40 Mhz */ { 135.0f, /* SGI */ 150.0f, }, + }, + + /* MCS 8 */ + { /* 20 Mhz */ { 13.0f, /* SGI */ 14.4f, }, + /* 40 Mhz */ { 27.0f, /* SGI */ 30.0f, }, + }, + + /* MCS 9 */ + { /* 20 Mhz */ { 26.0f, /* SGI */ 28.9f, }, + /* 40 Mhz */ { 54.0f, /* SGI */ 60.0f, }, + }, + + /* MCS 10 */ + { /* 20 Mhz */ { 39.0f, /* SGI */ 43.3f, }, + /* 40 Mhz */ { 81.0f, /* SGI */ 90.0f, }, + }, + + /* MCS 11 */ + { /* 20 Mhz */ { 52.0f, /* SGI */ 57.8f, }, + /* 40 Mhz */ { 108.0f, /* SGI */ 120.0f, }, + }, + + /* MCS 12 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 13 */ + { /* 20 Mhz */ { 104.0f, /* SGI */ 115.6f, }, + /* 40 Mhz */ { 216.0f, /* SGI */ 240.0f, }, + }, + + /* MCS 14 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 15 */ + { /* 20 Mhz */ { 130.0f, /* SGI */ 144.4f, }, + /* 40 Mhz */ { 270.0f, /* SGI */ 300.0f, }, + }, + + /* MCS 16 */ + { /* 20 Mhz */ { 19.5f, /* SGI */ 21.7f, }, + /* 40 Mhz */ { 40.5f, /* SGI */ 45.0f, }, + }, + + /* MCS 17 */ + { /* 20 Mhz */ { 39.0f, /* SGI */ 43.3f, }, + /* 40 Mhz */ { 81.0f, /* SGI */ 90.0f, }, + }, + + /* MCS 18 */ + { /* 20 Mhz */ { 58.5f, /* SGI */ 65.0f, }, + /* 40 Mhz */ { 121.5f, /* SGI */ 135.0f, }, + }, + + /* MCS 19 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 20 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 21 */ + { /* 20 Mhz */ { 156.0f, /* SGI */ 173.3f, }, + /* 40 Mhz */ { 324.0f, /* SGI */ 360.0f, }, + }, + + /* MCS 22 */ + { /* 20 Mhz */ { 175.5f, /* SGI */ 195.0f, }, + /* 40 Mhz */ { 364.5f, /* SGI */ 405.0f, }, + }, + + /* MCS 23 */ + { /* 20 Mhz */ { 195.0f, /* SGI */ 216.7f, }, + /* 40 Mhz */ { 405.0f, /* SGI */ 450.0f, }, + }, + + /* MCS 24 */ + { /* 20 Mhz */ { 26.0f, /* SGI */ 28.9f, }, + /* 40 Mhz */ { 54.0f, /* SGI */ 60.0f, }, + }, + + /* MCS 25 */ + { /* 20 Mhz */ { 52.0f, /* SGI */ 57.8f, }, + /* 40 Mhz */ { 108.0f, /* SGI */ 120.0f, }, + }, + + /* MCS 26 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 27 */ + { /* 20 Mhz */ { 104.0f, /* SGI */ 115.6f, }, + /* 40 Mhz */ { 216.0f, /* SGI */ 240.0f, }, + }, + + /* MCS 28 */ + { /* 20 Mhz */ { 156.0f, /* SGI */ 173.3f, }, + /* 40 Mhz */ { 324.0f, /* SGI */ 360.0f, }, + }, + + /* MCS 29 */ + { /* 20 Mhz */ { 208.0f, /* SGI */ 231.1f, }, + /* 40 Mhz */ { 432.0f, /* SGI */ 480.0f, }, + }, + + /* MCS 30 */ + { /* 20 Mhz */ { 234.0f, /* SGI */ 260.0f, }, + /* 40 Mhz */ { 486.0f, /* SGI */ 540.0f, }, + }, + + /* MCS 31 */ + { /* 20 Mhz */ { 260.0f, /* SGI */ 288.9f, }, + /* 40 Mhz */ { 540.0f, /* SGI */ 600.0f, }, + }, + + /* MCS 32 */ + { /* 20 Mhz */ { 0.0f, /* SGI */ 0.0f, }, /* not valid */ + /* 40 Mhz */ { 6.0f, /* SGI */ 6.7f, }, + }, + + /* MCS 33 */ + { /* 20 Mhz */ { 39.0f, /* SGI */ 43.3f, }, + /* 40 Mhz */ { 81.0f, /* SGI */ 90.0f, }, + }, + + /* MCS 34 */ + { /* 20 Mhz */ { 52.0f, /* SGI */ 57.8f, }, + /* 40 Mhz */ { 108.0f, /* SGI */ 120.0f, }, + }, + + /* MCS 35 */ + { /* 20 Mhz */ { 65.0f, /* SGI */ 72.2f, }, + /* 40 Mhz */ { 135.0f, /* SGI */ 150.0f, }, + }, + + /* MCS 36 */ + { /* 20 Mhz */ { 58.5f, /* SGI */ 65.0f, }, + /* 40 Mhz */ { 121.5f, /* SGI */ 135.0f, }, + }, + + /* MCS 37 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 38 */ + { /* 20 Mhz */ { 97.5f, /* SGI */ 108.3f, }, + /* 40 Mhz */ { 202.5f, /* SGI */ 225.0f, }, + }, + + /* MCS 39 */ + { /* 20 Mhz */ { 52.0f, /* SGI */ 57.8f, }, + /* 40 Mhz */ { 108.0f, /* SGI */ 120.0f, }, + }, + + /* MCS 40 */ + { /* 20 Mhz */ { 65.0f, /* SGI */ 72.2f, }, + /* 40 Mhz */ { 135.0f, /* SGI */ 150.0f, }, + }, + + /* MCS 41 */ + { /* 20 Mhz */ { 65.0f, /* SGI */ 72.2f, }, + /* 40 Mhz */ { 135.0f, /* SGI */ 150.0f, }, + }, + + /* MCS 42 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 43 */ + { /* 20 Mhz */ { 91.0f, /* SGI */ 101.1f, }, + /* 40 Mhz */ { 189.0f, /* SGI */ 210.0f, }, + }, + + /* MCS 44 */ + { /* 20 Mhz */ { 91.0f, /* SGI */ 101.1f, }, + /* 40 Mhz */ { 189.0f, /* SGI */ 210.0f, }, + }, + + /* MCS 45 */ + { /* 20 Mhz */ { 104.0f, /* SGI */ 115.6f, }, + /* 40 Mhz */ { 216.0f, /* SGI */ 240.0f, }, + }, + + /* MCS 46 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 47 */ + { /* 20 Mhz */ { 97.5f, /* SGI */ 108.3f, }, + /* 40 Mhz */ { 202.5f, /* SGI */ 225.0f, }, + }, + + /* MCS 48 */ + { /* 20 Mhz */ { 97.5f, /* SGI */ 108.3f, }, + /* 40 Mhz */ { 202.5f, /* SGI */ 225.0f, }, + }, + + /* MCS 49 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 50 */ + { /* 20 Mhz */ { 136.5f, /* SGI */ 151.7f, }, + /* 40 Mhz */ { 283.5f, /* SGI */ 315.0f, }, + }, + + /* MCS 51 */ + { /* 20 Mhz */ { 136.5f, /* SGI */ 151.7f, }, + /* 40 Mhz */ { 283.5f, /* SGI */ 315.0f, }, + }, + + /* MCS 52 */ + { /* 20 Mhz */ { 156.0f, /* SGI */ 173.3f, }, + /* 40 Mhz */ { 324.0f, /* SGI */ 360.0f, }, + }, + + /* MCS 53 */ + { /* 20 Mhz */ { 65.0f, /* SGI */ 72.2f, }, + /* 40 Mhz */ { 135.0f, /* SGI */ 150.0f, }, + }, + + /* MCS 54 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 55 */ + { /* 20 Mhz */ { 91.0f, /* SGI */ 101.1f, }, + /* 40 Mhz */ { 189.0f, /* SGI */ 210.0f, }, + }, + + /* MCS 56 */ + { /* 20 Mhz */ { 78.0f, /* SGI */ 86.7f, }, + /* 40 Mhz */ { 162.0f, /* SGI */ 180.0f, }, + }, + + /* MCS 57 */ + { /* 20 Mhz */ { 91.0f, /* SGI */ 101.1f, }, + /* 40 Mhz */ { 189.0f, /* SGI */ 210.0f, }, + }, + + /* MCS 58 */ + { /* 20 Mhz */ { 104.0f, /* SGI */ 115.6f, }, + /* 40 Mhz */ { 216.0f, /* SGI */ 240.0f, }, + }, + + /* MCS 59 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 60 */ + { /* 20 Mhz */ { 104.0f, /* SGI */ 115.6f, }, + /* 40 Mhz */ { 216.0f, /* SGI */ 240.0f, }, + }, + + /* MCS 61 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 62 */ + { /* 20 Mhz */ { 130.0f, /* SGI */ 144.4f, }, + /* 40 Mhz */ { 270.0f, /* SGI */ 300.0f, }, + }, + + /* MCS 63 */ + { /* 20 Mhz */ { 130.0f, /* SGI */ 144.4f, }, + /* 40 Mhz */ { 270.0f, /* SGI */ 300.0f, }, + }, + + /* MCS 64 */ + { /* 20 Mhz */ { 143.0f, /* SGI */ 158.9f, }, + /* 40 Mhz */ { 297.0f, /* SGI */ 330.0f, }, + }, + + /* MCS 65 */ + { /* 20 Mhz */ { 97.5f, /* SGI */ 108.3f, }, + /* 40 Mhz */ { 202.5f, /* SGI */ 225.0f, }, + }, + + /* MCS 66 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 67 */ + { /* 20 Mhz */ { 136.5f, /* SGI */ 151.7f, }, + /* 40 Mhz */ { 283.5f, /* SGI */ 315.0f, }, + }, + + /* MCS 68 */ + { /* 20 Mhz */ { 117.0f, /* SGI */ 130.0f, }, + /* 40 Mhz */ { 243.0f, /* SGI */ 270.0f, }, + }, + + /* MCS 69 */ + { /* 20 Mhz */ { 136.5f, /* SGI */ 151.7f, }, + /* 40 Mhz */ { 283.5f, /* SGI */ 315.0f, }, + }, + + /* MCS 70 */ + { /* 20 Mhz */ { 156.0f, /* SGI */ 173.3f, }, + /* 40 Mhz */ { 324.0f, /* SGI */ 360.0f, }, + }, + + /* MCS 71 */ + { /* 20 Mhz */ { 175.5f, /* SGI */ 195.0f, }, + /* 40 Mhz */ { 364.5f, /* SGI */ 405.0f, }, + }, + + /* MCS 72 */ + { /* 20 Mhz */ { 156.0f, /* SGI */ 173.3f, }, + /* 40 Mhz */ { 324.0f, /* SGI */ 360.0f, }, + }, + + /* MCS 73 */ + { /* 20 Mhz */ { 175.5f, /* SGI */ 195.0f, }, + /* 40 Mhz */ { 364.5f, /* SGI */ 405.0f, }, + }, + + /* MCS 74 */ + { /* 20 Mhz */ { 195.0f, /* SGI */ 216.7f, }, + /* 40 Mhz */ { 405.0f, /* SGI */ 450.0f, }, + }, + + /* MCS 75 */ + { /* 20 Mhz */ { 195.0f, /* SGI */ 216.7f, }, + /* 40 Mhz */ { 405.0f, /* SGI */ 450.0f, }, + }, + + /* MCS 76 */ + { /* 20 Mhz */ { 214.5f, /* SGI */ 238.3f, }, + /* 40 Mhz */ { 445.5f, /* SGI */ 495.0f, }, + }, +}; + +/* protocol */ +static int proto_radiotap = -1; + +static int hf_radiotap_version = -1; +static int hf_radiotap_pad = -1; +static int hf_radiotap_length = -1; +static int hf_radiotap_present = -1; +static int hf_radiotap_mactime = -1; +static int hf_radiotap_channel = -1; +static int hf_radiotap_channel_frequency = -1; +static int hf_radiotap_channel_flags = -1; +static int hf_radiotap_channel_flags_turbo = -1; +static int hf_radiotap_channel_flags_cck = -1; +static int hf_radiotap_channel_flags_ofdm = -1; +static int hf_radiotap_channel_flags_2ghz = -1; +static int hf_radiotap_channel_flags_5ghz = -1; +static int hf_radiotap_channel_flags_passive = -1; +static int hf_radiotap_channel_flags_dynamic = -1; +static int hf_radiotap_channel_flags_gfsk = -1; +static int hf_radiotap_channel_flags_gsm = -1; +static int hf_radiotap_channel_flags_sturbo = -1; +static int hf_radiotap_channel_flags_half = -1; +static int hf_radiotap_channel_flags_quarter = -1; +static int hf_radiotap_rxflags = -1; +static int hf_radiotap_rxflags_badplcp = -1; +static int hf_radiotap_xchannel = -1; +static int hf_radiotap_xchannel_frequency = -1; +static int hf_radiotap_xchannel_flags = -1; +static int hf_radiotap_xchannel_flags_turbo = -1; +static int hf_radiotap_xchannel_flags_cck = -1; +static int hf_radiotap_xchannel_flags_ofdm = -1; +static int hf_radiotap_xchannel_flags_2ghz = -1; +static int hf_radiotap_xchannel_flags_5ghz = -1; +static int hf_radiotap_xchannel_flags_passive = -1; +static int hf_radiotap_xchannel_flags_dynamic = -1; +static int hf_radiotap_xchannel_flags_gfsk = -1; +static int hf_radiotap_xchannel_flags_gsm = -1; +static int hf_radiotap_xchannel_flags_sturbo = -1; +static int hf_radiotap_xchannel_flags_half = -1; +static int hf_radiotap_xchannel_flags_quarter = -1; +static int hf_radiotap_xchannel_flags_ht20 = -1; +static int hf_radiotap_xchannel_flags_ht40u = -1; +static int hf_radiotap_xchannel_flags_ht40d = -1; +#if 0 +static int hf_radiotap_xchannel_maxpower = -1; +#endif +static int hf_radiotap_fhss_hopset = -1; +static int hf_radiotap_fhss_pattern = -1; +static int hf_radiotap_datarate = -1; +static int hf_radiotap_antenna = -1; +static int hf_radiotap_dbm_antsignal = -1; +static int hf_radiotap_db_antsignal = -1; +static int hf_radiotap_dbm_antnoise = -1; +static int hf_radiotap_db_antnoise = -1; +static int hf_radiotap_tx_attenuation = -1; +static int hf_radiotap_db_tx_attenuation = -1; +static int hf_radiotap_txpower = -1; +static int hf_radiotap_vendor_ns = -1; +static int hf_radiotap_ven_oui = -1; +static int hf_radiotap_ven_subns = -1; +static int hf_radiotap_ven_skip = -1; +static int hf_radiotap_ven_data = -1; +static int hf_radiotap_mcs = -1; +static int hf_radiotap_mcs_known = -1; +static int hf_radiotap_mcs_have_bw = -1; +static int hf_radiotap_mcs_have_index = -1; +static int hf_radiotap_mcs_have_gi = -1; +static int hf_radiotap_mcs_have_format = -1; +static int hf_radiotap_mcs_have_fec = -1; +static int hf_radiotap_mcs_have_stbc = -1; +static int hf_radiotap_mcs_bw = -1; +static int hf_radiotap_mcs_index = -1; +static int hf_radiotap_mcs_gi = -1; +static int hf_radiotap_mcs_format = -1; +static int hf_radiotap_mcs_fec = -1; +static int hf_radiotap_mcs_stbc = -1; + +/* "Present" flags */ +static int hf_radiotap_present_tsft = -1; +static int hf_radiotap_present_flags = -1; +static int hf_radiotap_present_rate = -1; +static int hf_radiotap_present_channel = -1; +static int hf_radiotap_present_fhss = -1; +static int hf_radiotap_present_dbm_antsignal = -1; +static int hf_radiotap_present_dbm_antnoise = -1; +static int hf_radiotap_present_lock_quality = -1; +static int hf_radiotap_present_tx_attenuation = -1; +static int hf_radiotap_present_db_tx_attenuation = -1; +static int hf_radiotap_present_dbm_tx_power = -1; +static int hf_radiotap_present_antenna = -1; +static int hf_radiotap_present_db_antsignal = -1; +static int hf_radiotap_present_db_antnoise = -1; +static int hf_radiotap_present_hdrfcs = -1; +static int hf_radiotap_present_rxflags = -1; +static int hf_radiotap_present_xchannel = -1; +static int hf_radiotap_present_mcs = -1; +static int hf_radiotap_present_rtap_ns = -1; +static int hf_radiotap_present_vendor_ns = -1; +static int hf_radiotap_present_ext = -1; + +/* "present.flags" flags */ +static int hf_radiotap_flags = -1; +static int hf_radiotap_flags_cfp = -1; +static int hf_radiotap_flags_preamble = -1; +static int hf_radiotap_flags_wep = -1; +static int hf_radiotap_flags_frag = -1; +static int hf_radiotap_flags_fcs = -1; +static int hf_radiotap_flags_datapad = -1; +static int hf_radiotap_flags_badfcs = -1; +static int hf_radiotap_flags_shortgi = -1; + +static int hf_radiotap_quality = -1; +static int hf_radiotap_fcs = -1; +static int hf_radiotap_fcs_bad = -1; + +static gint ett_radiotap = -1; +static gint ett_radiotap_present = -1; +static gint ett_radiotap_flags = -1; +static gint ett_radiotap_rxflags = -1; +static gint ett_radiotap_channel_flags = -1; +static gint ett_radiotap_xchannel_flags = -1; +static gint ett_radiotap_vendor = -1; +static gint ett_radiotap_mcs = -1; +static gint ett_radiotap_mcs_known = -1; + +static dissector_handle_t ieee80211_handle; +static dissector_handle_t ieee80211_datapad_handle; + +static int radiotap_tap = -1; + +/* Settings */ +static gboolean radiotap_bit14_fcs = FALSE; + +static void +dissect_radiotap(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree); + +#define BITNO_32(x) (((x) >> 16) ? 16 + BITNO_16((x) >> 16) : BITNO_16((x))) +#define BITNO_16(x) (((x) >> 8) ? 8 + BITNO_8((x) >> 8) : BITNO_8((x))) +#define BITNO_8(x) (((x) >> 4) ? 4 + BITNO_4((x) >> 4) : BITNO_4((x))) +#define BITNO_4(x) (((x) >> 2) ? 2 + BITNO_2((x) >> 2) : BITNO_2((x))) +#define BITNO_2(x) (((x) & 2) ? 1 : 0) +#define BIT(n) (1 << n) + +/* + * The NetBSD ieee80211_radiotap man page + * (http://netbsd.gw.com/cgi-bin/man-cgi?ieee80211_radiotap+9+NetBSD-current) + * says: + * + * Radiotap capture fields must be naturally aligned. That is, 16-, 32-, + * and 64-bit fields must begin on 16-, 32-, and 64-bit boundaries, respec- + * tively. In this way, drivers can avoid unaligned accesses to radiotap + * capture fields. radiotap-compliant drivers must insert padding before a + * capture field to ensure its natural alignment. radiotap-compliant packet + * dissectors, such as tcpdump(8), expect the padding. + */ + +void +capture_radiotap(const guchar * pd, int offset, int len, packet_counts * ld) +{ + guint16 it_len; + guint32 present, xpresent; + guint8 rflags; + struct ieee80211_radiotap_header *hdr; + + if (!BYTES_ARE_IN_FRAME(offset, len, + sizeof(struct ieee80211_radiotap_header))) { + ld->other++; + return; + } + hdr = (void *)pd; + it_len = pletohs(&hdr->it_len); + if (!BYTES_ARE_IN_FRAME(offset, len, it_len)) { + ld->other++; + return; + } + + if (it_len > len) { + /* Header length is bigger than total packet length */ + ld->other++; + return; + } + + if (it_len < sizeof(struct ieee80211_radiotap_header)) { + /* Header length is shorter than fixed-length portion of header */ + ld->other++; + return; + } + + present = pletohl(&hdr->it_present); + offset += sizeof(struct ieee80211_radiotap_header); + it_len -= sizeof(struct ieee80211_radiotap_header); + + /* skip over other present bitmaps */ + xpresent = present; + while (xpresent & BIT(IEEE80211_RADIOTAP_EXT)) { + if (!BYTES_ARE_IN_FRAME(offset, 4, it_len)) { + ld->other++; + return; + } + xpresent = pletohl(pd + offset); + offset += 4; + it_len -= 4; + } + + rflags = 0; + + /* + * IEEE80211_RADIOTAP_TSFT is the lowest-order bit, + * just skip over it. + */ + if (present & BIT(IEEE80211_RADIOTAP_TSFT)) { + /* align it properly */ + if (offset & 7) { + int pad = 8 - (offset & 7); + offset += pad; + it_len -= pad; + } + + if (it_len < 8) { + /* No room in header for this field. */ + ld->other++; + return; + } + /* That field is present, and it's 8 bytes long. */ + offset += 8; + it_len -= 8; + } + + /* + * IEEE80211_RADIOTAP_FLAGS is the next bit. + */ + if (present & BIT(IEEE80211_RADIOTAP_FLAGS)) { + if (it_len < 1) { + /* No room in header for this field. */ + ld->other++; + return; + } + /* That field is present; fetch it. */ + if (!BYTES_ARE_IN_FRAME(offset, len, 1)) { + ld->other++; + return; + } + rflags = pd[offset]; + } + + /* 802.11 header follows */ + if (rflags & IEEE80211_RADIOTAP_F_DATAPAD) + capture_ieee80211_datapad(pd, offset + it_len, len, ld); + else + capture_ieee80211(pd, offset + it_len, len, ld); +} + +void proto_register_radiotap(void) +{ + static const value_string phy_type[] = { + {0, "Unknown"}, + {IEEE80211_CHAN_A, "802.11a"}, + {IEEE80211_CHAN_A | IEEE80211_CHAN_HT20, "802.11a (ht20)"}, + {IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U, "802.11a (ht40+)"}, + {IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D, "802.11a (ht40-)"}, + {IEEE80211_CHAN_B, "802.11b"}, + {IEEE80211_CHAN_PUREG, "802.11g (pure-g)"}, + {IEEE80211_CHAN_G, "802.11g"}, + {IEEE80211_CHAN_G | IEEE80211_CHAN_HT20, "802.11g (ht20)"}, + {IEEE80211_CHAN_G | IEEE80211_CHAN_HT40U, "802.11g (ht40+)"}, + {IEEE80211_CHAN_G | IEEE80211_CHAN_HT40D, "802.11g (ht40-)"}, + {IEEE80211_CHAN_T, "802.11a (turbo)"}, + {IEEE80211_CHAN_108PUREG, "802.11g (pure-g, turbo)"}, + {IEEE80211_CHAN_108G, "802.11g (turbo)"}, + {IEEE80211_CHAN_FHSS, "FHSS"}, + {0, NULL} + }; + + static const value_string mcs_bandwidth[] = { + { IEEE80211_RADIOTAP_MCS_BW_20, "20 MHz" }, + { IEEE80211_RADIOTAP_MCS_BW_40, "40 MHz" }, + { IEEE80211_RADIOTAP_MCS_BW_20L, "20 MHz lower" }, + { IEEE80211_RADIOTAP_MCS_BW_20U, "20 MHz upper" }, + {0, NULL} + }; + + static const value_string mcs_format[] = { + { 0, "mixed" }, + { 1, "greenfield" }, + {0, NULL}, + }; + + static const value_string mcs_fec[] = { + { 0, "BCC" }, + { 1, "LDPC" }, + {0, NULL} + }; + + static const value_string mcs_gi[] = { + { 0, "long" }, + { 1, "short" }, + {0, NULL} + }; + + static const true_false_string preamble_type = { + "Short", + "Long", + }; + + static hf_register_info hf[] = { + {&hf_radiotap_version, + {"Header revision", "radiotap.version", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Version of radiotap header format", HFILL}}, + {&hf_radiotap_pad, + {"Header pad", "radiotap.pad", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Padding", HFILL}}, + {&hf_radiotap_length, + {"Header length", "radiotap.length", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Length of header including version, pad, length and data fields", + HFILL}}, + {&hf_radiotap_present, + {"Present flags", "radiotap.present", + FT_NONE, BASE_NONE, NULL, 0x0, + "Bitmask indicating which fields are present", HFILL}}, + +#define RADIOTAP_MASK(name) BIT(IEEE80211_RADIOTAP_ ##name) + + /* Boolean 'present' flags */ + {&hf_radiotap_present_tsft, + {"TSFT", "radiotap.present.tsft", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(TSFT), + "Specifies if the Time Synchronization Function Timer field is present", + HFILL}}, + + {&hf_radiotap_present_flags, + {"Flags", "radiotap.present.flags", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(FLAGS), + "Specifies if the channel flags field is present", HFILL}}, + + {&hf_radiotap_present_rate, + {"Rate", "radiotap.present.rate", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(RATE), + "Specifies if the transmit/receive rate field is present", + HFILL}}, + + {&hf_radiotap_present_channel, + {"Channel", "radiotap.present.channel", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(CHANNEL), + "Specifies if the transmit/receive frequency field is present", + HFILL}}, + + {&hf_radiotap_present_fhss, + {"FHSS", "radiotap.present.fhss", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(FHSS), + "Specifies if the hop set and pattern is present for frequency hopping radios", + HFILL}}, + + {&hf_radiotap_present_dbm_antsignal, + {"dBm Antenna Signal", "radiotap.present.dbm_antsignal", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DBM_ANTSIGNAL), + "Specifies if the antenna signal strength in dBm is present", + HFILL}}, + + {&hf_radiotap_present_dbm_antnoise, + {"dBm Antenna Noise", "radiotap.present.dbm_antnoise", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DBM_ANTNOISE), + "Specifies if the RF noise power at antenna field is present", + HFILL}}, + + {&hf_radiotap_present_lock_quality, + {"Lock Quality", "radiotap.present.lock_quality", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(LOCK_QUALITY), + "Specifies if the signal quality field is present", HFILL}}, + + {&hf_radiotap_present_tx_attenuation, + {"TX Attenuation", "radiotap.present.tx_attenuation", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(TX_ATTENUATION), + "Specifies if the transmit power distance from max power field is present", + HFILL}}, + + {&hf_radiotap_present_db_tx_attenuation, + {"dB TX Attenuation", "radiotap.present.db_tx_attenuation", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DB_TX_ATTENUATION), + "Specifies if the transmit power distance from max power (in dB) field is present", + HFILL}}, + + {&hf_radiotap_present_dbm_tx_power, + {"dBm TX Power", "radiotap.present.dbm_tx_power", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DBM_TX_POWER), + "Specifies if the transmit power (in dBm) field is present", + HFILL}}, + + {&hf_radiotap_present_antenna, + {"Antenna", "radiotap.present.antenna", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(ANTENNA), + "Specifies if the antenna number field is present", HFILL}}, + + {&hf_radiotap_present_db_antsignal, + {"dB Antenna Signal", "radiotap.present.db_antsignal", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DB_ANTSIGNAL), + "Specifies if the RF signal power at antenna in dB field is present", + HFILL}}, + + {&hf_radiotap_present_db_antnoise, + {"dB Antenna Noise", "radiotap.present.db_antnoise", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(DB_ANTNOISE), + "Specifies if the RF signal power at antenna in dBm field is present", + HFILL}}, + + {&hf_radiotap_present_rxflags, + {"RX flags", "radiotap.present.rxflags", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(RX_FLAGS), + "Specifies if the RX flags field is present", HFILL}}, + + {&hf_radiotap_present_hdrfcs, + {"FCS in header", "radiotap.present.fcs", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(RX_FLAGS), + "Specifies if the FCS field is present", HFILL}}, + + {&hf_radiotap_present_xchannel, + {"Channel+", "radiotap.present.xchannel", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(XCHANNEL), + "Specifies if the extended channel info field is present", + HFILL}}, + + {&hf_radiotap_present_mcs, + {"HT information", "radiotap.present.mcs", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(MCS), + "Specifies if the HT field is present", HFILL}}, + + {&hf_radiotap_present_rtap_ns, + {"Radiotap NS next", "radiotap.present.rtap_ns", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(RADIOTAP_NAMESPACE), + "Specifies a reset to the radiotap namespace", HFILL}}, + + {&hf_radiotap_present_vendor_ns, + {"Vendor NS next", "radiotap.present.vendor_ns", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(VENDOR_NAMESPACE), + "Specifies that the next bitmap is in a vendor namespace", + HFILL}}, + + {&hf_radiotap_present_ext, + {"Ext", "radiotap.present.ext", + FT_BOOLEAN, 32, NULL, RADIOTAP_MASK(EXT), + "Specifies if there are any extensions to the header present", + HFILL}}, + + /* Boolean 'present.flags' flags */ + {&hf_radiotap_flags, + {"Flags", "radiotap.flags", + FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}}, + + {&hf_radiotap_flags_cfp, + {"CFP", "radiotap.flags.cfp", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_CFP, + "Sent/Received during CFP", HFILL}}, + + {&hf_radiotap_flags_preamble, + {"Preamble", "radiotap.flags.preamble", + FT_BOOLEAN, 8, TFS(&preamble_type), + IEEE80211_RADIOTAP_F_SHORTPRE, + "Sent/Received with short preamble", HFILL}}, + + {&hf_radiotap_flags_wep, + {"WEP", "radiotap.flags.wep", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_WEP, + "Sent/Received with WEP encryption", HFILL}}, + + {&hf_radiotap_flags_frag, + {"Fragmentation", "radiotap.flags.frag", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_FRAG, + "Sent/Received with fragmentation", HFILL}}, + + {&hf_radiotap_flags_fcs, + {"FCS at end", "radiotap.flags.fcs", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_FCS, + "Frame includes FCS at end", HFILL}}, + + {&hf_radiotap_flags_datapad, + {"Data Pad", "radiotap.flags.datapad", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_DATAPAD, + "Frame has padding between 802.11 header and payload", + HFILL}}, + + {&hf_radiotap_flags_badfcs, + {"Bad FCS", "radiotap.flags.badfcs", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_BADFCS, + "Frame received with bad FCS", HFILL}}, + + {&hf_radiotap_flags_shortgi, + {"Short GI", "radiotap.flags.shortgi", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_F_SHORTGI, + "Frame Sent/Received with HT short Guard Interval", HFILL}}, + + {&hf_radiotap_mactime, + {"MAC timestamp", "radiotap.mactime", + FT_UINT64, BASE_DEC, NULL, 0x0, + "Value in microseconds of the MAC's Time Synchronization Function timer when the first bit of the MPDU arrived at the MAC.", + HFILL}}, + + {&hf_radiotap_quality, + {"Signal Quality", "radiotap.quality", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Signal quality (unitless measure)", HFILL}}, + + {&hf_radiotap_fcs, + {"802.11 FCS", "radiotap.fcs", + FT_UINT32, BASE_HEX, NULL, 0x0, + "Frame check sequence of this frame", HFILL}}, + + {&hf_radiotap_channel, + {"Channel", "radiotap.channel", + FT_UINT32, BASE_DEC, NULL, 0x0, + "802.11 channel number that this frame was sent/received on", + HFILL}}, + + {&hf_radiotap_channel_frequency, + {"Channel frequency", "radiotap.channel.freq", + FT_UINT32, BASE_DEC, NULL, 0x0, + "Channel frequency in megahertz that this frame was sent/received on", + HFILL}}, + + {&hf_radiotap_channel_flags, + {"Channel type", "radiotap.channel.type", + FT_UINT16, BASE_HEX, VALS(phy_type), 0x0, + NULL, HFILL}}, + + {&hf_radiotap_channel_flags_turbo, + {"Turbo", "radiotap.channel.type.turbo", + FT_BOOLEAN, 16, NULL, 0x0010, "Channel Type Turbo", HFILL}}, + {&hf_radiotap_channel_flags_cck, + {"Complementary Code Keying (CCK)", + "radiotap.channel.type.cck", + FT_BOOLEAN, 16, NULL, 0x0020, + "Channel Type Complementary Code Keying (CCK) Modulation", + HFILL}}, + {&hf_radiotap_channel_flags_ofdm, + {"Orthogonal Frequency-Division Multiplexing (OFDM)", + "radiotap.channel.type.ofdm", + FT_BOOLEAN, 16, NULL, 0x0040, + "Channel Type Orthogonal Frequency-Division Multiplexing (OFDM)", + HFILL}}, + {&hf_radiotap_channel_flags_2ghz, + {"2 GHz spectrum", "radiotap.channel.type.2ghz", + FT_BOOLEAN, 16, NULL, 0x0080, "Channel Type 2 GHz spectrum", + HFILL}}, + {&hf_radiotap_channel_flags_5ghz, + {"5 GHz spectrum", "radiotap.channel.type.5ghz", + FT_BOOLEAN, 16, NULL, 0x0100, "Channel Type 5 GHz spectrum", + HFILL}}, + {&hf_radiotap_channel_flags_passive, + {"Passive", "radiotap.channel.type.passive", + FT_BOOLEAN, 16, NULL, 0x0200, "Channel Type Passive", HFILL}}, + {&hf_radiotap_channel_flags_dynamic, + {"Dynamic CCK-OFDM", "radiotap.channel.type.dynamic", + FT_BOOLEAN, 16, NULL, 0x0400, + "Channel Type Dynamic CCK-OFDM Channel", HFILL}}, + {&hf_radiotap_channel_flags_gfsk, + {"Gaussian Frequency Shift Keying (GFSK)", + "radiotap.channel.type.gfsk", + FT_BOOLEAN, 16, NULL, 0x0800, + "Channel Type Gaussian Frequency Shift Keying (GFSK) Modulation", + HFILL}}, + {&hf_radiotap_channel_flags_gsm, + {"GSM (900MHz)", "radiotap.channel.type.gsm", + FT_BOOLEAN, 16, NULL, 0x1000, "Channel Type GSM", HFILL}}, + {&hf_radiotap_channel_flags_sturbo, + {"Static Turbo", "radiotap.channel.type.sturbo", + FT_BOOLEAN, 16, NULL, 0x2000, "Channel Type Status Turbo", + HFILL}}, + {&hf_radiotap_channel_flags_half, + {"Half Rate Channel (10MHz Channel Width)", + "radiotap.channel.type.half", + FT_BOOLEAN, 16, NULL, 0x4000, "Channel Type Half Rate", + HFILL}}, + {&hf_radiotap_channel_flags_quarter, + {"Quarter Rate Channel (5MHz Channel Width)", + "radiotap.channel.type.quarter", + FT_BOOLEAN, 16, NULL, 0x8000, "Channel Type Quarter Rate", + HFILL}}, + + {&hf_radiotap_rxflags, + {"RX flags", "radiotap.rxflags", + FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}}, + + {&hf_radiotap_rxflags_badplcp, + {"Bad PLCP", "radiotap.rxflags.badplcp", + FT_BOOLEAN, 24, NULL, IEEE80211_RADIOTAP_F_RX_BADPLCP, + "Frame with bad PLCP", HFILL}}, + + {&hf_radiotap_xchannel, + {"Channel number", "radiotap.xchannel", + FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL}}, + {&hf_radiotap_xchannel_frequency, + {"Channel frequency", "radiotap.xchannel.freq", + FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL}}, + {&hf_radiotap_xchannel_flags, + {"Channel type", "radiotap.xchannel.flags", + FT_UINT32, BASE_HEX, VALS(phy_type), 0x0, NULL, HFILL}}, + + {&hf_radiotap_xchannel_flags_turbo, + {"Turbo", "radiotap.xchannel.type.turbo", + FT_BOOLEAN, 24, NULL, 0x0010, "Channel Type Turbo", HFILL}}, + {&hf_radiotap_xchannel_flags_cck, + {"Complementary Code Keying (CCK)", + "radiotap.xchannel.type.cck", + FT_BOOLEAN, 24, NULL, 0x0020, + "Channel Type Complementary Code Keying (CCK) Modulation", + HFILL}}, + {&hf_radiotap_xchannel_flags_ofdm, + {"Orthogonal Frequency-Division Multiplexing (OFDM)", + "radiotap.xchannel.type.ofdm", + FT_BOOLEAN, 24, NULL, 0x0040, + "Channel Type Orthogonal Frequency-Division Multiplexing (OFDM)", + HFILL}}, + {&hf_radiotap_xchannel_flags_2ghz, + {"2 GHz spectrum", "radiotap.xchannel.type.2ghz", + FT_BOOLEAN, 24, NULL, 0x0080, "Channel Type 2 GHz spectrum", + HFILL}}, + {&hf_radiotap_xchannel_flags_5ghz, + {"5 GHz spectrum", "radiotap.xchannel.type.5ghz", + FT_BOOLEAN, 24, NULL, 0x0100, "Channel Type 5 GHz spectrum", + HFILL}}, + {&hf_radiotap_xchannel_flags_passive, + {"Passive", "radiotap.channel.xtype.passive", + FT_BOOLEAN, 24, NULL, 0x0200, "Channel Type Passive", HFILL}}, + {&hf_radiotap_xchannel_flags_dynamic, + {"Dynamic CCK-OFDM", "radiotap.xchannel.type.dynamic", + FT_BOOLEAN, 24, NULL, 0x0400, + "Channel Type Dynamic CCK-OFDM Channel", HFILL}}, + {&hf_radiotap_xchannel_flags_gfsk, + {"Gaussian Frequency Shift Keying (GFSK)", + "radiotap.xchannel.type.gfsk", + FT_BOOLEAN, 24, NULL, 0x0800, + "Channel Type Gaussian Frequency Shift Keying (GFSK) Modulation", + HFILL}}, + {&hf_radiotap_xchannel_flags_gsm, + {"GSM (900MHz)", "radiotap.xchannel.type.gsm", + FT_BOOLEAN, 24, NULL, 0x1000, "Channel Type GSM", HFILL}}, + {&hf_radiotap_xchannel_flags_sturbo, + {"Static Turbo", "radiotap.xchannel.type.sturbo", + FT_BOOLEAN, 24, NULL, 0x2000, "Channel Type Status Turbo", + HFILL}}, + {&hf_radiotap_xchannel_flags_half, + {"Half Rate Channel (10MHz Channel Width)", + "radiotap.xchannel.type.half", + FT_BOOLEAN, 24, NULL, 0x4000, "Channel Type Half Rate", + HFILL}}, + {&hf_radiotap_xchannel_flags_quarter, + {"Quarter Rate Channel (5MHz Channel Width)", + "radiotap.xchannel.type.quarter", + FT_BOOLEAN, 24, NULL, 0x8000, "Channel Type Quarter Rate", + HFILL}}, + {&hf_radiotap_xchannel_flags_ht20, + {"HT Channel (20MHz Channel Width)", + "radiotap.xchannel.type.ht20", + FT_BOOLEAN, 24, NULL, 0x10000, "Channel Type HT/20", HFILL}}, + {&hf_radiotap_xchannel_flags_ht40u, + {"HT Channel (40MHz Channel Width with Extension channel above)", "radiotap.xchannel.type.ht40u", + FT_BOOLEAN, 24, NULL, 0x20000, "Channel Type HT/40+", HFILL}}, + {&hf_radiotap_xchannel_flags_ht40d, + {"HT Channel (40MHz Channel Width with Extension channel below)", "radiotap.xchannel.type.ht40d", + FT_BOOLEAN, 24, NULL, 0x40000, "Channel Type HT/40-", HFILL}}, +#if 0 + {&hf_radiotap_xchannel_maxpower, + {"Max transmit power", "radiotap.xchannel.maxpower", + FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL}}, +#endif + {&hf_radiotap_fhss_hopset, + {"FHSS Hop Set", "radiotap.fhss.hopset", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Frequency Hopping Spread Spectrum hopset", HFILL}}, + + {&hf_radiotap_fhss_pattern, + {"FHSS Pattern", "radiotap.fhss.pattern", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Frequency Hopping Spread Spectrum hop pattern", HFILL}}, + + {&hf_radiotap_datarate, + {"Data rate (Mb/s)", "radiotap.datarate", + FT_FLOAT, BASE_NONE, NULL, 0x0, + "Speed this frame was sent/received at", HFILL}}, + + {&hf_radiotap_antenna, + {"Antenna", "radiotap.antenna", + FT_UINT32, BASE_DEC, NULL, 0x0, + "Antenna number this frame was sent/received over (starting at 0)", + HFILL}}, + + {&hf_radiotap_dbm_antsignal, + {"SSI Signal (dBm)", "radiotap.dbm_antsignal", + FT_INT32, BASE_DEC, NULL, 0x0, + "RF signal power at the antenna from a fixed, arbitrary value in decibels from one milliwatt", + HFILL}}, + + {&hf_radiotap_db_antsignal, + {"SSI Signal (dB)", "radiotap.db_antsignal", + FT_UINT32, BASE_DEC, NULL, 0x0, + "RF signal power at the antenna from a fixed, arbitrary value in decibels", + HFILL}}, + + {&hf_radiotap_dbm_antnoise, + {"SSI Noise (dBm)", "radiotap.dbm_antnoise", + FT_INT32, BASE_DEC, NULL, 0x0, + "RF noise power at the antenna from a fixed, arbitrary value in decibels per one milliwatt", + HFILL}}, + + {&hf_radiotap_db_antnoise, + {"SSI Noise (dB)", "radiotap.db_antnoise", + FT_UINT32, BASE_DEC, NULL, 0x0, + "RF noise power at the antenna from a fixed, arbitrary value in decibels", + HFILL}}, + + {&hf_radiotap_tx_attenuation, + {"Transmit attenuation", "radiotap.txattenuation", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Transmit power expressed as unitless distance from max power set at factory (0 is max power)", + HFILL}}, + + {&hf_radiotap_db_tx_attenuation, + {"Transmit attenuation (dB)", "radiotap.db_txattenuation", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Transmit power expressed as decibels from max power set at factory (0 is max power)", + HFILL}}, + + {&hf_radiotap_txpower, + {"Transmit power", "radiotap.txpower", + FT_INT32, BASE_DEC, NULL, 0x0, + "Transmit power in decibels per one milliwatt (dBm)", HFILL}}, + + {&hf_radiotap_mcs, + {"MCS information", "radiotap.mcs", + FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}}, + {&hf_radiotap_mcs_known, + {"Known MCS information", "radiotap.mcs.known", + FT_UINT8, BASE_HEX, NULL, 0x0, + "Bit mask indicating what MCS information is present", HFILL}}, + {&hf_radiotap_mcs_have_bw, + {"Bandwidth", "radiotap.mcs.have_bw", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_BW, + "Bandwidth information present", HFILL}}, + {&hf_radiotap_mcs_have_gi, + {"Guard interval", "radiotap.mcs.have_gi", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_GI, + "Sent/Received guard interval information present", HFILL}}, + {&hf_radiotap_mcs_have_format, + {"Format", "radiotap.mcs.have_format", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_FMT, + "Format information present", HFILL}}, + {&hf_radiotap_mcs_have_fec, + {"FEC", "radiotap.mcs.have_fec", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_FEC, + "Forward error correction information present", HFILL}}, + {&hf_radiotap_mcs_have_stbc, + {"STBC", "radiotap.mcs.have_stbc", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_STBC, + "Space Time Block Coding information present", HFILL}}, + {&hf_radiotap_mcs_have_index, + {"MCS index", "radiotap.mcs.have_index", + FT_BOOLEAN, 8, NULL, IEEE80211_RADIOTAP_MCS_HAVE_MCS, + "MCS index information present", HFILL}}, + {&hf_radiotap_mcs_bw, + {"Bandwidth", "radiotap.mcs.bw", + FT_UINT8, BASE_DEC, VALS(mcs_bandwidth), + IEEE80211_RADIOTAP_MCS_BW_MASK, NULL, HFILL}}, + {&hf_radiotap_mcs_gi, + {"Guard interval", "radiotap.mcs.gi", + FT_UINT8, BASE_DEC, VALS(mcs_gi), IEEE80211_RADIOTAP_MCS_SGI, + "Sent/Received guard interval", HFILL}}, + {&hf_radiotap_mcs_format, + {"Format", "radiotap.mcs.format", + FT_UINT8, BASE_DEC, VALS(mcs_format), IEEE80211_RADIOTAP_MCS_FMT_GF, + NULL, HFILL}}, + {&hf_radiotap_mcs_fec, + {"FEC", "radiotap.mcs.fec", + FT_UINT8, BASE_DEC, VALS(mcs_fec), IEEE80211_RADIOTAP_MCS_FEC_LDPC, + "forward error correction", HFILL}}, + {&hf_radiotap_mcs_stbc, + {"STBC", "radiotap.mcs.stbc", + FT_BOOLEAN, 8, TFS(&tfs_on_off), IEEE80211_RADIOTAP_MCS_STBC, + "Space Time Block Code", HFILL}}, + + {&hf_radiotap_mcs_index, + {"MCS index", "radiotap.mcs.index", + FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}}, + + {&hf_radiotap_vendor_ns, + {"Vendor namespace", "radiotap.vendor_namespace", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL}}, + + {&hf_radiotap_ven_oui, + {"Vendor OUI", "radiotap.vendor_oui", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL}}, + + {&hf_radiotap_ven_subns, + {"Vendor sub namespace", "radiotap.vendor_subns", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Vendor-specified sub namespace", HFILL}}, + + {&hf_radiotap_ven_skip, + {"Vendor data length", "radiotap.vendor_data_len", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Length of vendor-specified data", HFILL}}, + + {&hf_radiotap_ven_data, + {"Vendor data", "radiotap.vendor_data", + FT_NONE, BASE_NONE, NULL, 0x0, + "Vendor-specified data", HFILL}}, + + /* Special variables */ + {&hf_radiotap_fcs_bad, + {"Bad FCS", "radiotap.fcs_bad", + FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "Specifies if this frame has a bad frame check sequence", + HFILL}}, + + }; + static gint *ett[] = { + &ett_radiotap, + &ett_radiotap_present, + &ett_radiotap_flags, + &ett_radiotap_rxflags, + &ett_radiotap_channel_flags, + &ett_radiotap_xchannel_flags, + &ett_radiotap_vendor, + &ett_radiotap_mcs, + &ett_radiotap_mcs_known, + }; + module_t *radiotap_module; + + proto_radiotap = + proto_register_protocol("IEEE 802.11 Radiotap Capture header", + "802.11 Radiotap", "radiotap"); + proto_register_field_array(proto_radiotap, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + register_dissector("radiotap", dissect_radiotap, proto_radiotap); + + radiotap_tap = register_tap("radiotap"); + + radiotap_module = prefs_register_protocol(proto_radiotap, NULL); + prefs_register_bool_preference(radiotap_module, "bit14_fcs_in_header", + "Assume bit 14 means FCS in header", + "Radiotap has a bit to indicate whether the FCS is still on the frame or not. " + "Some generators (e.g. AirPcap) use a non-standard radiotap flag 14 to put " + "the FCS into the header.", + &radiotap_bit14_fcs); +} + +static void +dissect_radiotap(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) +{ + proto_tree *radiotap_tree = NULL; + proto_tree *pt, *present_tree = NULL; + proto_tree *ft; + proto_item *ti = NULL; + proto_item *hidden_item; + int offset; + tvbuff_t *next_tvb; + guint8 version; + guint length; + guint32 rate, freq, flags; + proto_item *rate_ti; + gint8 dbm, db; + guint8 rflags = 0; + /* backward compat with bit 14 == fcs in header */ + proto_item *hdr_fcs_ti = NULL; + int hdr_fcs_offset = 0; + guint32 sent_fcs = 0; + guint32 calc_fcs; + gint err; + struct ieee80211_radiotap_iterator iter; + void *data; + struct _radiotap_info *radiotap_info; + static struct _radiotap_info rtp_info_arr; + + /* our non-standard overrides */ + static struct radiotap_override overrides[] = { + {IEEE80211_RADIOTAP_XCHANNEL, 4, 8}, /* xchannel */ + + /* keep last */ + {14, 4, 4}, /* FCS in header */ + }; + guint n_overrides = array_length(overrides); + + if (!radiotap_bit14_fcs) + n_overrides--; + + radiotap_info = &rtp_info_arr; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "WLAN"); + col_clear(pinfo->cinfo, COL_INFO); + + version = tvb_get_guint8(tvb, 0); + length = tvb_get_letohs(tvb, 2); + + radiotap_info->radiotap_length = length; + + col_add_fstr(pinfo->cinfo, COL_INFO, "Radiotap Capture v%u, Length %u", + version, length); + + /* Dissect the packet */ + if (tree) { + ti = proto_tree_add_protocol_format(tree, proto_radiotap, + tvb, 0, length, + "Radiotap Header v%u, Length %u", + version, length); + radiotap_tree = proto_item_add_subtree(ti, ett_radiotap); + proto_tree_add_uint(radiotap_tree, hf_radiotap_version, + tvb, 0, 1, version); + proto_tree_add_item(radiotap_tree, hf_radiotap_pad, + tvb, 1, 1, ENC_BIG_ENDIAN); + proto_tree_add_uint(radiotap_tree, hf_radiotap_length, + tvb, 2, 2, length); + } + + data = ep_tvb_memdup(tvb, 0, length); + if (!data) + return; + + if (ieee80211_radiotap_iterator_init(&iter, data, length, NULL)) { + if (tree) + proto_item_append_text(ti, " (invalid)"); + /* maybe the length was correct anyway ... */ + goto hand_off_to_80211; + } + + iter.overrides = overrides; + iter.n_overrides = n_overrides; + + /* Add the "present flags" bitmaps. */ + if (tree) { + guchar *bmap_start = (guchar *) data + 4; + guint n_bitmaps = (guint)(iter.this_arg - bmap_start) / 4; + guint i; + gboolean rtap_ns, rtap_ns_next = TRUE; + guint rtap_ns_offset, rtap_ns_offset_next = 0; + + pt = proto_tree_add_item(radiotap_tree, hf_radiotap_present, + tvb, 4, n_bitmaps * 4, + ENC_NA); + + for (i = 0; i < n_bitmaps; i++) { + guint32 bmap = pletohl(bmap_start + 4 * i); + + rtap_ns_offset = rtap_ns_offset_next; + rtap_ns_offset_next += 32; + + present_tree = + proto_item_add_subtree(pt, ett_radiotap_present); + + offset = 4 * i; + + rtap_ns = rtap_ns_next; + + /* Evaluate what kind of namespaces will come next */ + if (bmap & BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE)) { + rtap_ns_next = TRUE; + rtap_ns_offset_next = 0; + } + if (bmap & BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) + rtap_ns_next = FALSE; + if ((bmap & (BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE) | + BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE))) + == (BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE) | + BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE))) + goto malformed; + + if (!rtap_ns) + goto always_bits; + + /* Currently, we don't know anything about bits >= 32 */ + if (rtap_ns_offset) + goto always_bits; + + proto_tree_add_item(present_tree, + hf_radiotap_present_tsft, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_flags, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_rate, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_channel, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_fhss, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_dbm_antsignal, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_dbm_antnoise, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_lock_quality, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_tx_attenuation, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_db_tx_attenuation, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_dbm_tx_power, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_antenna, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_db_antsignal, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_db_antnoise, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + if (radiotap_bit14_fcs) { + proto_tree_add_item(present_tree, + hf_radiotap_present_hdrfcs, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + } else { + proto_tree_add_item(present_tree, + hf_radiotap_present_rxflags, + tvb, offset + 4, 4, ENC_LITTLE_ENDIAN); + } + proto_tree_add_item(present_tree, + hf_radiotap_present_xchannel, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + + proto_tree_add_item(present_tree, + hf_radiotap_present_mcs, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + always_bits: + proto_tree_add_item(present_tree, + hf_radiotap_present_rtap_ns, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_vendor_ns, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + proto_tree_add_item(present_tree, + hf_radiotap_present_ext, tvb, + offset + 4, 4, ENC_LITTLE_ENDIAN); + } + } + + while (!(err = ieee80211_radiotap_iterator_next(&iter))) { + offset = (int)((guchar *) iter.this_arg - (guchar *) data); + + if (iter.this_arg_index == IEEE80211_RADIOTAP_VENDOR_NAMESPACE + && tree) { + proto_tree *vt, *ven_tree = NULL; + const gchar *manuf_name; + guint8 subns; + + manuf_name = tvb_get_manuf_name(tvb, offset); + subns = tvb_get_guint8(tvb, offset+3); + + vt = proto_tree_add_bytes_format(radiotap_tree, + hf_radiotap_vendor_ns, + tvb, offset, + iter.this_arg_size, + NULL, + "Vendor namespace: %s-%d", + manuf_name, subns); + ven_tree = proto_item_add_subtree(vt, ett_radiotap_vendor); + proto_tree_add_bytes_format(ven_tree, + hf_radiotap_ven_oui, tvb, + offset, 3, NULL, + "Vendor: %s", manuf_name); + proto_tree_add_item(ven_tree, hf_radiotap_ven_subns, + tvb, offset + 3, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(ven_tree, hf_radiotap_ven_skip, tvb, + offset + 4, 2, ENC_LITTLE_ENDIAN); + proto_tree_add_item(ven_tree, hf_radiotap_ven_data, tvb, + offset + 6, iter.this_arg_size - 6, + ENC_NA); + } + + if (!iter.is_radiotap_ns) + continue; + + switch (iter.this_arg_index) { + case IEEE80211_RADIOTAP_TSFT: + radiotap_info->tsft = tvb_get_letoh64(tvb, offset); + if (tree) { + proto_tree_add_uint64(radiotap_tree, + hf_radiotap_mactime, tvb, + offset, 8, + radiotap_info->tsft); + } + break; + + case IEEE80211_RADIOTAP_FLAGS: { + proto_tree *flags_tree; + + rflags = tvb_get_guint8(tvb, offset); + if (tree) { + ft = proto_tree_add_item(radiotap_tree, + hf_radiotap_flags, + tvb, offset, 1, ENC_BIG_ENDIAN); + flags_tree = + proto_item_add_subtree(ft, + ett_radiotap_flags); + + proto_tree_add_item(flags_tree, + hf_radiotap_flags_cfp, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_preamble, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_wep, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_frag, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_fcs, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_datapad, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_badfcs, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(flags_tree, + hf_radiotap_flags_shortgi, + tvb, offset, 1, ENC_BIG_ENDIAN); + } + break; + } + + case IEEE80211_RADIOTAP_RATE: + rate = tvb_get_guint8(tvb, offset); + /* + * XXX On FreeBSD rate & 0x80 means we have an MCS. On + * Linux and AirPcap it does not. (What about + * Mac OS X, NetBSD, OpenBSD, and DragonFly BSD?) + * + * This is an issue either for proprietary extensions + * to 11a or 11g, which do exist, or for 11n + * implementations that stuff a rate value into + * this field, which also appear to exist. + * + * We currently handle that by assuming that + * if the 0x80 bit is set *and* the remaining + * bits have a value between 0 and 15 it's + * an MCS value, otherwise it's a rate. If + * there are cases where systems that use + * "0x80 + MCS index" for MCS indices > 15, + * or stuff a rate value here between 64 and + * 71.5 Mb/s in here, we'll need a preference + * setting. Such rates do exist, e.g. 11n + * MCS 7 at 20 MHz with a long guard interval. + */ + if (rate >= 0x80 && rate <= 0x8f) { + /* + * XXX - we don't know the channel width + * or guard interval length, so we can't + * convert this to a data rate. + * + * If you want us to show a data rate, + * use the MCS field, not the Rate field; + * the MCS field includes not only the + * MCS index, it also includes bandwidth + * and guard interval information. + * + * XXX - can we get the channel width + * from XChannel and the guard interval + * information from Flags, at least on + * FreeBSD? + */ + if (tree) { + proto_tree_add_uint(radiotap_tree, + hf_radiotap_mcs_index, + tvb, offset, 1, + rate & 0x7f); + } + } else { + col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%d.%d", + rate / 2, rate & 1 ? 5 : 0); + if (tree) { + proto_tree_add_float_format(radiotap_tree, + hf_radiotap_datarate, + tvb, offset, 1, + (float)rate / 2, + "Data Rate: %.1f Mb/s", + (float)rate / 2); + } + radiotap_info->rate = rate; + } + break; + + case IEEE80211_RADIOTAP_CHANNEL: { + proto_item *it; + proto_tree *flags_tree; + gchar *chan_str; + + if (tree) { + freq = tvb_get_letohs(tvb, offset); + flags = tvb_get_letohs(tvb, offset + 2); + chan_str = ieee80211_mhz_to_str(freq); + col_add_fstr(pinfo->cinfo, + COL_FREQ_CHAN, "%s", chan_str); + proto_tree_add_uint_format(radiotap_tree, + hf_radiotap_channel_frequency, + tvb, offset, 2, freq, + "Channel frequency: %s", + chan_str); + g_free(chan_str); + /* We're already 2-byte aligned. */ + it = proto_tree_add_uint(radiotap_tree, + hf_radiotap_channel_flags, + tvb, offset + 2, 2, flags); + flags_tree = + proto_item_add_subtree(it, + ett_radiotap_channel_flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_turbo, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_cck, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_ofdm, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_2ghz, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_5ghz, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_passive, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_dynamic, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_gfsk, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_gsm, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_sturbo, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_half, + tvb, offset + 3, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_channel_flags_quarter, + tvb, offset + 3, 1, flags); + radiotap_info->freq = freq; + radiotap_info->flags = flags; + } + break; + } + + case IEEE80211_RADIOTAP_FHSS: + proto_tree_add_item(radiotap_tree, + hf_radiotap_fhss_hopset, tvb, + offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(radiotap_tree, + hf_radiotap_fhss_pattern, tvb, + offset, 1, ENC_BIG_ENDIAN); + break; + + case IEEE80211_RADIOTAP_DBM_ANTSIGNAL: + dbm = (gint8) tvb_get_guint8(tvb, offset); + col_add_fstr(pinfo->cinfo, COL_RSSI, "%d dBm", dbm); + if (tree) { + proto_tree_add_int_format(radiotap_tree, + hf_radiotap_dbm_antsignal, + tvb, offset, 1, dbm, + "SSI Signal: %d dBm", + dbm); + } + radiotap_info->dbm_antsignal = dbm; + break; + + case IEEE80211_RADIOTAP_DBM_ANTNOISE: + 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); + } + radiotap_info->dbm_antnoise = dbm; + break; + + case IEEE80211_RADIOTAP_LOCK_QUALITY: + if (tree) { + proto_tree_add_uint(radiotap_tree, + hf_radiotap_quality, tvb, + offset, 2, + tvb_get_letohs(tvb, + offset)); + } + break; + + case IEEE80211_RADIOTAP_TX_ATTENUATION: + proto_tree_add_item(radiotap_tree, + hf_radiotap_tx_attenuation, tvb, + offset, 2, ENC_BIG_ENDIAN); + break; + + case IEEE80211_RADIOTAP_DB_TX_ATTENUATION: + proto_tree_add_item(radiotap_tree, + hf_radiotap_db_tx_attenuation, tvb, + offset, 2, ENC_BIG_ENDIAN); + 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)); + } + break; + + case IEEE80211_RADIOTAP_ANTENNA: + if (tree) { + proto_tree_add_uint(radiotap_tree, + hf_radiotap_antenna, tvb, + offset, 1, + tvb_get_guint8(tvb, + offset)); + } + break; + + case IEEE80211_RADIOTAP_DB_ANTSIGNAL: + db = tvb_get_guint8(tvb, offset); + col_add_fstr(pinfo->cinfo, COL_RSSI, "%u dB", db); + if (tree) { + proto_tree_add_uint_format(radiotap_tree, + hf_radiotap_db_antsignal, + tvb, offset, 1, db, + "SSI Signal: %u dB", + db); + } + 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); + } + break; + + case IEEE80211_RADIOTAP_RX_FLAGS: { + proto_tree *flags_tree; + + if (radiotap_bit14_fcs) { + if (tree) { + sent_fcs = tvb_get_ntohl(tvb, offset); + hdr_fcs_ti = proto_tree_add_uint(radiotap_tree, + hf_radiotap_fcs, tvb, + offset, 4, sent_fcs); + hdr_fcs_offset = offset; + } + } else { + proto_item *it; + + if (tree) { + flags = tvb_get_letohs(tvb, offset); + it = proto_tree_add_uint(radiotap_tree, + hf_radiotap_rxflags, + tvb, offset, 2, flags); + flags_tree = + proto_item_add_subtree(it, + ett_radiotap_rxflags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_rxflags_badplcp, + tvb, offset, 1, flags); + } + } + break; + } + + case IEEE80211_RADIOTAP_XCHANNEL: { + proto_item *it; + proto_tree *flags_tree; + + if (tree) { + int channel; + + flags = tvb_get_letohl(tvb, offset); + freq = tvb_get_letohs(tvb, offset + 4); + channel = tvb_get_guint8(tvb, offset + 6); + proto_tree_add_uint(radiotap_tree, + hf_radiotap_xchannel, + tvb, offset + 6, 1, + (guint32) channel); + proto_tree_add_uint(radiotap_tree, + hf_radiotap_xchannel_frequency, + tvb, offset + 4, 2, freq); + it = proto_tree_add_uint(radiotap_tree, + hf_radiotap_xchannel_flags, + tvb, offset + 0, 4, flags); + flags_tree = + proto_item_add_subtree(it, ett_radiotap_xchannel_flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_turbo, + tvb, offset + 0, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_cck, + tvb, offset + 0, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_ofdm, + tvb, offset + 0, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_2ghz, + tvb, offset + 0, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_5ghz, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_passive, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_dynamic, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_gfsk, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_gsm, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_sturbo, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_half, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_quarter, + tvb, offset + 1, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_ht20, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_ht40u, + tvb, offset + 2, 1, flags); + proto_tree_add_boolean(flags_tree, + hf_radiotap_xchannel_flags_ht40d, + tvb, offset + 2, 1, flags); +#if 0 + proto_tree_add_uint(radiotap_tree, + hf_radiotap_xchannel_maxpower, + tvb, offset + 7, 1, maxpower); +#endif + } + break; + } + case IEEE80211_RADIOTAP_MCS: { + proto_item *it; + proto_tree *mcs_tree = NULL, *mcs_known_tree; + guint8 mcs_known, mcs_flags; + guint8 mcs; + guint bandwidth; + guint gi_length; + gboolean can_calculate_rate; + + /* + * Start out assuming that we can calculate the rate; + * if we are missing any of the MCS index, channel + * width, or guard interval length, we can't. + */ + can_calculate_rate = TRUE; + + mcs_known = tvb_get_guint8(tvb, offset); + mcs_flags = tvb_get_guint8(tvb, offset + 1); + mcs = tvb_get_guint8(tvb, offset + 2); + + if (tree) { + it = proto_tree_add_item(radiotap_tree, hf_radiotap_mcs, + tvb, offset, 3, ENC_NA); + mcs_tree = proto_item_add_subtree(it, ett_radiotap_mcs); + it = proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_known, + tvb, offset, 1, mcs_known); + mcs_known_tree = proto_item_add_subtree(it, ett_radiotap_mcs_known); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_bw, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_index, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_gi, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_format, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_fec, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(mcs_known_tree, hf_radiotap_mcs_have_stbc, + tvb, offset, 1, ENC_LITTLE_ENDIAN); + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW) { + bandwidth = ((mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK) == IEEE80211_RADIOTAP_MCS_BW_40) ? + 1 : 0; + if (mcs_tree) + proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_bw, + tvb, offset + 1, 1, mcs_flags); + } else { + bandwidth = 0; + can_calculate_rate = FALSE; /* no bandwidth */ + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI) { + gi_length = (mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) ? + 1 : 0; + if (mcs_tree) + proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_gi, + tvb, offset + 1, 1, mcs_flags); + } else { + gi_length = 0; + can_calculate_rate = FALSE; /* no GI width */ + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FMT) { + if (mcs_tree) + proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_format, + tvb, offset + 1, 1, mcs_flags); + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC) { + if (mcs_tree) + proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_fec, + tvb, offset + 1, 1, mcs_flags); + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { + if (mcs_tree) + proto_tree_add_boolean(mcs_tree, hf_radiotap_mcs_stbc, + tvb, offset + 1, 1, mcs_flags); + } + if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS) { + if (mcs_tree) + proto_tree_add_uint(mcs_tree, hf_radiotap_mcs_index, + tvb, offset + 2, 1, mcs); + } else + can_calculate_rate = FALSE; /* no MCS index */ + + /* + * If we have the MCS index, channel width, and + * guard interval length, and the MCS index is + * valid, we can compute the rate. If the resulting + * rate is non-zero, report it. (If it's zero, + * it's an MCS/channel width/GI combination that + * 802.11n doesn't support.) + */ + if (can_calculate_rate && mcs <= MAX_MCS_INDEX + && ieee80211_float_htrates[mcs][bandwidth][gi_length] != 0.0) { + col_add_fstr(pinfo->cinfo, COL_TX_RATE, "%.1f", + ieee80211_float_htrates[mcs][bandwidth][gi_length]); + if (tree) { + rate_ti = proto_tree_add_float_format(radiotap_tree, + hf_radiotap_datarate, + tvb, offset, 3, + ieee80211_float_htrates[mcs][bandwidth][gi_length], + "Data Rate: %.1f Mb/s", + ieee80211_float_htrates[mcs][bandwidth][gi_length]); + PROTO_ITEM_SET_GENERATED(rate_ti); + } + } + break; + } + } + } + + if (err != -ENOENT && tree) { + malformed: + proto_item_append_text(ti, " (malformed)"); + } + + /* This handles the case of an FCS exiting at the end of the frame. */ + if (rflags & IEEE80211_RADIOTAP_F_FCS) + pinfo->pseudo_header->ieee_802_11.fcs_len = 4; + else + pinfo->pseudo_header->ieee_802_11.fcs_len = 0; + + hand_off_to_80211: + /* Grab the rest of the frame. */ + next_tvb = tvb_new_subset_remaining(tvb, length); + + /* If we had an in-header FCS, check it. + * This can only happen if the backward-compat configuration option + * is chosen by the user. */ + if (hdr_fcs_ti) { + /* It would be very strange for the header to have an FCS for the + * frame *and* the frame to have the FCS at the end, but it's possible, so + * take that into account by using the FCS length recorded in pinfo. */ + + /* Watch out for [erroneously] short frames */ + if (tvb_length(next_tvb) > + (unsigned int)pinfo->pseudo_header->ieee_802_11.fcs_len) { + calc_fcs = + crc32_802_tvb(next_tvb, + tvb_length(next_tvb) - + pinfo->pseudo_header->ieee_802_11.fcs_len); + + /* By virtue of hdr_fcs_ti being set, we know that 'tree' is set, + * so there's no need to check it here. */ + if (calc_fcs == sent_fcs) { + proto_item_append_text(hdr_fcs_ti, + " [correct]"); + } else { + proto_item_append_text(hdr_fcs_ti, + " [incorrect, should be 0x%08x]", + calc_fcs); + hidden_item = + proto_tree_add_boolean(radiotap_tree, + hf_radiotap_fcs_bad, + tvb, hdr_fcs_offset, + 4, TRUE); + PROTO_ITEM_SET_HIDDEN(hidden_item); + } + } else { + proto_item_append_text(hdr_fcs_ti, + " [cannot verify - not enough data]"); + } + } + + /* dissect the 802.11 header next */ + call_dissector((rflags & IEEE80211_RADIOTAP_F_DATAPAD) ? + ieee80211_datapad_handle : ieee80211_handle, + next_tvb, pinfo, tree); + + tap_queue_packet(radiotap_tap, pinfo, radiotap_info); +} + +void proto_reg_handoff_radiotap(void) +{ + dissector_handle_t radiotap_handle; + + /* handle for 802.11 dissector */ + ieee80211_handle = find_dissector("wlan"); + ieee80211_datapad_handle = find_dissector("wlan_datapad"); + + radiotap_handle = find_dissector("radiotap"); + + dissector_add_uint("wtap_encap", WTAP_ENCAP_IEEE_802_11_RADIOTAP, + radiotap_handle); +} + +/* + * Editor modelines - http://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 8 + * tab-width: 8 + * indent-tabs-mode: t + * End: + * + * vi: set shiftwidth=8 tabstop=8 noexpandtab: + * :indentSize=8:tabSize=8:noTabs=false: + */ |