From Harald Welte:
Add new GSMTAP dissector. https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4508 (I incorporated the .h file into the .c file). svn path=/trunk/; revision=32214
This commit is contained in:
Anders Broman
parent
e3259bb648
commit
04edfe3b2a
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@ -485,6 +485,7 @@ DISSECTOR_SRC = \
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packet-gsm_sms.c \
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packet-gsm_sms_ud.c \
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packet-gsm_um.c \
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packet-gsmtap.c \
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packet-gssapi.c \
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packet-gtp.c \
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packet-gtpv2.c \
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@ -0,0 +1,398 @@
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/* packet-gsmtap.c
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* Routines for GSMTAP captures
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*
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* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* 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
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* 02111-1307, USA.
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*
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*/
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/* GSMTAP is a generic header format for GSM protocol captures,
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* it uses the IANA-assigned UDP port number 4729 and carries
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* payload in various formats of GSM interfaces such as Um MAC
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* blocks or Um bursts.
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*
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* Example programs generating GSMTAP data are airprobe
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* (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/)
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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 <epan/packet.h>
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#include <epan/prefs.h>
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#define GSMTAP_TYPE_UM 0x01
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#define GSMTAP_TYPE_ABIS 0x02
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#define GSMTAP_TYPE_UM_BURST 0x03 /* raw burst bits */
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#define GSMTAP_BURST_UNKNOWN 0x00
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#define GSMTAP_BURST_FCCH 0x01
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#define GSMTAP_BURST_PARTIAL_SCH 0x02
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#define GSMTAP_BURST_SCH 0x03
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#define GSMTAP_BURST_CTS_SCH 0x04
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#define GSMTAP_BURST_COMPACT_SCH 0x05
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#define GSMTAP_BURST_NORMAL 0x06
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#define GSMTAP_BURST_DUMMY 0x07
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#define GSMTAP_BURST_ACCESS 0x08
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#define GSMTAP_BURST_NONE 0x09
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#define GSMTAP_CHANNEL_UNKNOWN 0x00
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#define GSMTAP_CHANNEL_BCCH 0x01
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#define GSMTAP_CHANNEL_CCCH 0x02
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#define GSMTAP_CHANNEL_RACH 0x03
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#define GSMTAP_CHANNEL_AGCH 0x04
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#define GSMTAP_CHANNEL_PCH 0x05
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#define GSMTAP_CHANNEL_SDCCH 0x06
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#define GSMTAP_CHANNEL_SDCCH4 0x07
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#define GSMTAP_CHANNEL_SDCCH8 0x08
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#define GSMTAP_CHANNEL_TCH_F 0x09
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#define GSMTAP_CHANNEL_TCH_H 0x0a
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#define GSMTAP_CHANNEL_ACCH 0x80
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#define GSMTAP_ARFCN_F_PCS 0x8000
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#define GSMTAP_ARFCN_F_UPLINK 0x4000
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#define GSMTAP_ARFCN_MASK 0x3fff
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#define GSMTAP_UDP_PORT 4729
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/* This is the header as it is used by gsmtap-generating software.
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* It is not used by the wireshark dissector and provided for reference only.
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struct gsmtap_hdr {
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guint8 version; // version, set to 0x01 currently
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guint8 hdr_len; // length in number of 32bit words
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guint8 type; // see GSMTAP_TYPE_*
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guint8 timeslot; // timeslot (0..7 on Um)
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guint16 arfcn; // ARFCN (frequency)
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gint8 signal_dbm; // signal level in dBm
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gint8 snr_db; // signal/noise ratio in dB
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guint32 frame_number; // GSM Frame Number (FN)
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guint8 sub_type; // Type of burst/channel, see above
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guint8 antenna_nr; // Antenna Number
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guint8 sub_slot; // sub-slot within timeslot
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guint8 res; // reserved for future use (RFU)
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}
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*/
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static int proto_gsmtap = -1;
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static int hf_gsmtap_version = -1;
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static int hf_gsmtap_hdrlen = -1;
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static int hf_gsmtap_type = -1;
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static int hf_gsmtap_timeslot = -1;
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static int hf_gsmtap_subslot = -1;
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static int hf_gsmtap_arfcn = -1;
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static int hf_gsmtap_uplink = -1;
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static int hf_gsmtap_noise_dbm = -1;
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static int hf_gsmtap_signal_dbm = -1;
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static int hf_gsmtap_frame_nr = -1;
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static int hf_gsmtap_burst_type = -1;
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static int hf_gsmtap_channel_type = -1;
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static int hf_gsmtap_antenna = -1;
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static int hf_sacch_l1h_power_lev = -1;
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static int hf_sacch_l1h_fpc = -1;
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static int hf_sacch_l1h_ta = -1;
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static gint ett_gsmtap = -1;
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enum {
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GSMTAP_SUB_DATA = 0,
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GSMTAP_SUB_UM,
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GSMTAP_SUB_UM_LAPDM,
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GSMTAP_SUB_ABIS,
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GSMTAP_SUB_MAX
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};
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static dissector_handle_t sub_handles[GSMTAP_SUB_MAX];
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static const value_string gsmtap_bursts[] = {
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{ GSMTAP_BURST_UNKNOWN, "UNKNOWN" },
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{ GSMTAP_BURST_FCCH, "FCCH" },
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{ GSMTAP_BURST_PARTIAL_SCH, "PARTIAL SCH" },
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{ GSMTAP_BURST_SCH, "SCH" },
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{ GSMTAP_BURST_CTS_SCH, "CTS SCH" },
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{ GSMTAP_BURST_COMPACT_SCH, "COMPACT SCH" },
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{ GSMTAP_BURST_NORMAL, "NORMAL" },
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{ GSMTAP_BURST_DUMMY, "DUMMY" },
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{ GSMTAP_BURST_ACCESS, "RACH" },
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{ 0, NULL },
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};
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static const value_string gsmtap_channels[] = {
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{ GSMTAP_CHANNEL_UNKNOWN, "UNKNOWN" },
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{ GSMTAP_CHANNEL_BCCH, "BCCH" },
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{ GSMTAP_CHANNEL_CCCH, "CCCH" },
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{ GSMTAP_CHANNEL_RACH, "RACH" },
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{ GSMTAP_CHANNEL_AGCH, "AGCH" },
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{ GSMTAP_CHANNEL_PCH, "PCH" },
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{ GSMTAP_CHANNEL_SDCCH, "SDCCH" },
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{ GSMTAP_CHANNEL_SDCCH4, "SDCCH/4" },
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{ GSMTAP_CHANNEL_SDCCH8, "SDCCH/8" },
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{ GSMTAP_CHANNEL_TCH_F, "FACCH/F" },
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{ GSMTAP_CHANNEL_TCH_H, "FACCH/H" },
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{ GSMTAP_CHANNEL_ACCH|
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GSMTAP_CHANNEL_SDCCH, "LSACCH" },
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{ GSMTAP_CHANNEL_ACCH|
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GSMTAP_CHANNEL_SDCCH4, "SACCH/4" },
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{ GSMTAP_CHANNEL_ACCH|
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GSMTAP_CHANNEL_SDCCH8, "SACCH/8" },
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{ GSMTAP_CHANNEL_ACCH|
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GSMTAP_CHANNEL_TCH_F, "SACCH/F" },
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{ GSMTAP_CHANNEL_ACCH|
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GSMTAP_CHANNEL_TCH_F, "SACCH/H" },
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{ 0, NULL },
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};
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static const value_string gsmtap_types[] = {
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{ GSMTAP_TYPE_UM, "GSM Um (MS<->BTS)" },
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{ GSMTAP_TYPE_ABIS, "GSM Abis (BTS<->BSC)" },
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{ GSMTAP_TYPE_UM_BURST, "GSM Um burst (MS<->BTS)" },
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{ 0, NULL },
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};
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/* dissect a SACCH L1 header which is included in the first 2 bytes
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* of every SACCH frame (according to TS 04.04) */
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static void
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dissect_sacch_l1h(tvbuff_t *tvb, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *l1h_tree = NULL;
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if (!tree)
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return;
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ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, 2,
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"SACCH L1 Header, Power Level: %u, Timing Advance: %u",
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tvb_get_guint8(tvb, 0) & 0x1f,
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tvb_get_guint8(tvb, 1));
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l1h_tree = proto_item_add_subtree(ti, ett_gsmtap);
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/* Power Level */
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proto_tree_add_item(l1h_tree, hf_sacch_l1h_power_lev, tvb, 0, 1, FALSE);
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/* Fast Power Control */
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proto_tree_add_item(l1h_tree, hf_sacch_l1h_fpc, tvb, 0, 1, FALSE);
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/* Acutal Timing Advance */
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proto_tree_add_item(l1h_tree, hf_sacch_l1h_ta, tvb, 1, 1, FALSE);
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}
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/* dissect a GSMTAP header and hand payload off to respective dissector */
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static void
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dissect_gsmtap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int sub_handle, len, offset = 0;
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proto_item *ti;
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proto_tree *gsmtap_tree = NULL;
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tvbuff_t *payload_tvb, *l1h_tvb = NULL;
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guint8 hdr_len, type, sub_type;
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guint16 arfcn;
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len = tvb_length(tvb);
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hdr_len = tvb_get_guint8(tvb, offset + 1) <<2;
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type = tvb_get_guint8(tvb, offset + 2);
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sub_type = tvb_get_guint8(tvb, offset + 12);
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arfcn = tvb_get_ntohs(tvb, offset + 4);
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/* In case of a SACCH, there is a two-byte L1 header in front
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* of the packet (see TS 04.04) */
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if (type == GSMTAP_TYPE_UM &&
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sub_type & GSMTAP_CHANNEL_ACCH) {
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l1h_tvb = tvb_new_subset(tvb, hdr_len, 2, 2);
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payload_tvb = tvb_new_subset(tvb, hdr_len+2, len-(hdr_len+2),
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len-(hdr_len+2));
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} else {
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payload_tvb = tvb_new_subset(tvb, hdr_len, len-hdr_len,
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len-hdr_len);
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}
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/* We don't want any UDP related info left in the INFO field, as the
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* gsm_a_dtap dissector will not clear but only append */
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col_clear(pinfo->cinfo, COL_INFO);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GSMTAP");
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if (arfcn & GSMTAP_ARFCN_F_UPLINK) {
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col_append_str(pinfo->cinfo, COL_RES_NET_SRC, "MS");
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col_append_str(pinfo->cinfo, COL_RES_NET_DST, "BTS");
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/* p2p_dir is used by the LAPDm dissector */
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pinfo->p2p_dir = P2P_DIR_SENT;
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} else {
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col_set_str(pinfo->cinfo, COL_RES_NET_SRC, "BTS");
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switch (sub_type & ~GSMTAP_CHANNEL_ACCH) {
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case GSMTAP_CHANNEL_BCCH:
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case GSMTAP_CHANNEL_CCCH:
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case GSMTAP_CHANNEL_PCH:
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case GSMTAP_CHANNEL_AGCH:
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col_set_str(pinfo->cinfo, COL_RES_NET_DST, "Broadcast");
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break;
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default:
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col_set_str(pinfo->cinfo, COL_RES_NET_DST, "MS");
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break;
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}
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/* p2p_dir is used by the LAPDm dissector */
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pinfo->p2p_dir = P2P_DIR_RECV;
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}
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, hdr_len,
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"GSM TAP Header, ARFCN: %u (%s), TS: %u, Channel: %s (%u)",
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arfcn & GSMTAP_ARFCN_MASK,
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arfcn & GSMTAP_ARFCN_F_UPLINK ? "Uplink" : "Downlink",
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tvb_get_guint8(tvb, offset+3),
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match_strval(tvb_get_guint8(tvb, offset+12), gsmtap_channels),
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tvb_get_guint8(tvb, offset+14));
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gsmtap_tree = proto_item_add_subtree(ti, ett_gsmtap);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_version,
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tvb, offset, 1, FALSE);
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proto_tree_add_uint_format(gsmtap_tree, hf_gsmtap_hdrlen,
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tvb, offset+1, 1, hdr_len,
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"Header length: %u bytes", hdr_len);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_type,
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tvb, offset+2, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_timeslot,
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tvb, offset+3, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_arfcn,
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tvb, offset+4, 2, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_uplink,
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tvb, offset+4, 2, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_noise_dbm,
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tvb, offset+6, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_signal_dbm,
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tvb, offset+7, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_frame_nr,
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tvb, offset+8, 4, FALSE);
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if (type == GSMTAP_TYPE_UM_BURST)
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_burst_type,
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tvb, offset+12, 1, FALSE);
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else if (type == GSMTAP_TYPE_UM)
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_channel_type,
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tvb, offset+12, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_antenna,
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tvb, offset+13, 1, FALSE);
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proto_tree_add_item(gsmtap_tree, hf_gsmtap_subslot,
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tvb, offset+14, 1, FALSE);
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}
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switch (type) {
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case GSMTAP_TYPE_UM:
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if (l1h_tvb)
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dissect_sacch_l1h(l1h_tvb, tree);
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switch (sub_type & ~GSMTAP_CHANNEL_ACCH) {
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case GSMTAP_CHANNEL_BCCH:
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case GSMTAP_CHANNEL_CCCH:
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case GSMTAP_CHANNEL_PCH:
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case GSMTAP_CHANNEL_AGCH:
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/* FIXME: we might want to skip idle frames */
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sub_handle = GSMTAP_SUB_UM;
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break;
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case GSMTAP_CHANNEL_SDCCH:
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case GSMTAP_CHANNEL_SDCCH4:
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case GSMTAP_CHANNEL_SDCCH8:
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case GSMTAP_CHANNEL_TCH_F:
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case GSMTAP_CHANNEL_TCH_H:
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sub_handle = GSMTAP_SUB_UM_LAPDM;
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break;
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case GSMTAP_CHANNEL_RACH:
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default:
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sub_handle = GSMTAP_SUB_DATA;
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break;
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}
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break;
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case GSMTAP_TYPE_UM_BURST:
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default:
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sub_handle = GSMTAP_SUB_DATA;
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break;
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}
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call_dissector(sub_handles[sub_handle], payload_tvb, pinfo, tree);
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}
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static const true_false_string sacch_l1h_fpc_mode_vals = {
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"In use",
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"Not in use"
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};
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void
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proto_register_gsmtap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_gsmtap_version, { "Version", "gsmtap.version",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_hdrlen, { "Header Length", "gsmtap.hdr_len",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_type, { "Payload Type", "gsmtap.type",
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FT_UINT8, BASE_DEC, VALS(gsmtap_types), 0, NULL, HFILL } },
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{ &hf_gsmtap_timeslot, { "Time Slot", "gsmtap.ts",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_arfcn, { "ARFCN", "gsmtap.arfcn",
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FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_MASK, NULL, HFILL } },
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{ &hf_gsmtap_uplink, { "Uplink", "gsmtap.uplink",
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FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_F_UPLINK, NULL, HFILL } },
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{ &hf_gsmtap_noise_dbm, { "Signal/Noise Ratio (dB)", "gsmtap.snr_db",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_signal_dbm, { "Signal Level (dBm)", "gsmtap.signal_dbm",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_frame_nr, { "GSM Frame Number", "gsmtap.frame_nr",
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FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_burst_type, { "Burst Type", "gsmtap.burst_type",
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FT_UINT8, BASE_DEC, VALS(gsmtap_bursts), 0, NULL, HFILL }},
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{ &hf_gsmtap_channel_type, { "Channel Type", "gsmtap.chan_type",
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FT_UINT8, BASE_DEC, VALS(gsmtap_channels), 0, NULL, HFILL }},
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{ &hf_gsmtap_antenna, { "Antenna Number", "gsmtap.antenna",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_gsmtap_subslot, { "Sub-Slot", "gsmtap.sub_slot",
|
||||
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
||||
|
||||
{ &hf_sacch_l1h_power_lev, { "MS power level", "gsmtap.sacch_l1.power_lev",
|
||||
FT_UINT8, BASE_DEC, NULL, 0x1f, NULL, HFILL } },
|
||||
{ &hf_sacch_l1h_fpc, { "FPC", "gsmtap.sacch_l1.fpc",
|
||||
FT_BOOLEAN, 8, TFS(&sacch_l1h_fpc_mode_vals), 0x04,
|
||||
NULL, HFILL } },
|
||||
{ &hf_sacch_l1h_ta, { "Actual Timing Advance", "gsmtap.sacch_l1.ta",
|
||||
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
||||
};
|
||||
static gint *ett[] = {
|
||||
&ett_gsmtap
|
||||
};
|
||||
|
||||
proto_gsmtap = proto_register_protocol("GSM Radiotap", "GSMTAP", "gsmtap");
|
||||
proto_register_field_array(proto_gsmtap, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
}
|
||||
|
||||
void
|
||||
proto_reg_handoff_gsmtap(void)
|
||||
{
|
||||
dissector_handle_t gsmtap_handle;
|
||||
|
||||
sub_handles[GSMTAP_SUB_DATA] = find_dissector("data");
|
||||
sub_handles[GSMTAP_SUB_UM] = find_dissector("gsm_a_ccch");
|
||||
sub_handles[GSMTAP_SUB_UM_LAPDM] = find_dissector("lapdm");
|
||||
sub_handles[GSMTAP_SUB_ABIS] = find_dissector("gsm_a_dtap");
|
||||
gsmtap_handle = create_dissector_handle(dissect_gsmtap, proto_gsmtap);
|
||||
dissector_add("udp.port", GSMTAP_UDP_PORT, gsmtap_handle);
|
||||
}
|
||||
Loading…
Reference in New Issue