Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 4508] Add new GSMTAP dissector

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https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4508

--- Comment #8 from ali yaman <ceo_1234@xxxxxxxxxxx> 2011-04-26 16:56:29 PDT ---
(From update of attachment 4363)
>Index: epan/dissectors/packet-gsmtap.c
>===================================================================
>--- /dev/null
>+++ epan/dissectors/packet-gsmtap.c
>@@ -0,0 +1,345 @@
>+/* packet-gsmtap.c
>+ * Routines for GSMTAP captures
>+ *
>+ * (C) 2008-2010 by Harald Welte <laforge@xxxxxxxxxxxx>
>+ *
>+ * $Id$
>+ *
>+ * Wireshark - Network traffic analyzer
>+ * By Gerald Combs <gerald@xxxxxxxxxxxxx>
>+ * Copyright 1998 Gerald Combs
>+ *
>+ * 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.
>+ *
>+ */
>+
>+/* GSMTAP is a generic header format for GSM protocol captures,
>+ * it uses the IANA-assigned UDP port number 4729 and carries
>+ * payload in various formats of GSM interfaces such as Um MAC
>+ * blocks or Um bursts.
>+ *
>+ * Example programs generating GSMTAP data are airprobe
>+ * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/)
>+ */
>+
>+#ifdef HAVE_CONFIG_H
>+# include "config.h"
>+#endif
>+
>+#include <glib.h>
>+#include <epan/packet.h>
>+#include <epan/prefs.h>
>+
>+#include "packet-gsmtap.h"
>+
>+static int proto_gsmtap = -1;
>+
>+static int hf_gsmtap_version = -1;
>+static int hf_gsmtap_hdrlen = -1;
>+static int hf_gsmtap_type = -1;
>+static int hf_gsmtap_timeslot = -1;
>+static int hf_gsmtap_subslot = -1;
>+static int hf_gsmtap_arfcn = -1;
>+static int hf_gsmtap_uplink = -1;
>+static int hf_gsmtap_noise_dbm = -1;
>+static int hf_gsmtap_signal_dbm = -1;
>+static int hf_gsmtap_frame_nr = -1;
>+static int hf_gsmtap_burst_type = -1;
>+static int hf_gsmtap_channel_type = -1;
>+static int hf_gsmtap_antenna = -1;
>+
>+static int hf_sacch_l1h_power_lev = -1;
>+static int hf_sacch_l1h_fpc = -1;
>+static int hf_sacch_l1h_ta = -1;
>+
>+static gint ett_gsmtap = -1;
>+
>+enum {
>+	GSMTAP_SUB_DATA = 0,
>+	GSMTAP_SUB_UM,
>+	GSMTAP_SUB_UM_LAPDM,
>+	GSMTAP_SUB_ABIS,
>+
>+	GSMTAP_SUB_MAX
>+};
>+
>+static dissector_handle_t sub_handles[GSMTAP_SUB_MAX];
>+
>+static const value_string gsmtap_bursts[] = {
>+	{ GSMTAP_BURST_UNKNOWN,		"UNKNOWN" },
>+	{ GSMTAP_BURST_FCCH,		"FCCH" },
>+	{ GSMTAP_BURST_PARTIAL_SCH,	"PARTIAL SCH" },
>+	{ GSMTAP_BURST_SCH,		"SCH" },
>+	{ GSMTAP_BURST_CTS_SCH,		"CTS SCH" },
>+	{ GSMTAP_BURST_COMPACT_SCH,	"COMPACT SCH" },
>+	{ GSMTAP_BURST_NORMAL,		"NORMAL" },
>+	{ GSMTAP_BURST_DUMMY,		"DUMMY" },
>+	{ GSMTAP_BURST_ACCESS,		"RACH" },
>+	{ 0,				NULL },
>+};
>+
>+static const value_string gsmtap_channels[] = {
>+	{ GSMTAP_CHANNEL_UNKNOWN,	"UNKNOWN" },
>+	{ GSMTAP_CHANNEL_BCCH,		"BCCH" },
>+	{ GSMTAP_CHANNEL_CCCH,		"CCCH" },
>+	{ GSMTAP_CHANNEL_RACH,		"RACH" },
>+	{ GSMTAP_CHANNEL_AGCH,		"AGCH" },
>+	{ GSMTAP_CHANNEL_PCH,		"PCH" },
>+	{ GSMTAP_CHANNEL_SDCCH,		"SDCCH" },
>+	{ GSMTAP_CHANNEL_SDCCH4,	"SDCCH/4" },
>+	{ GSMTAP_CHANNEL_SDCCH8,	"SDCCH/8" },
>+	{ GSMTAP_CHANNEL_TCH_F,		"FACCH/F" },
>+	{ GSMTAP_CHANNEL_TCH_H,		"FACCH/H" },
>+	{ GSMTAP_CHANNEL_ACCH|
>+	  GSMTAP_CHANNEL_SDCCH,		"LSACCH" },
>+	{ GSMTAP_CHANNEL_ACCH|
>+	  GSMTAP_CHANNEL_SDCCH4,	"SACCH/4" },
>+	{ GSMTAP_CHANNEL_ACCH|
>+	  GSMTAP_CHANNEL_SDCCH8,	"SACCH/8" },
>+	{ GSMTAP_CHANNEL_ACCH|
>+	  GSMTAP_CHANNEL_TCH_F,		"SACCH/F" },
>+	{ GSMTAP_CHANNEL_ACCH|
>+	  GSMTAP_CHANNEL_TCH_F,		"SACCH/H" },
>+	{ 0,				NULL },
>+};
>+
>+static const value_string gsmtap_types[] = {
>+	{ GSMTAP_TYPE_UM,	"GSM Um (MS<->BTS)" },
>+	{ GSMTAP_TYPE_ABIS,	"GSM Abis (BTS<->BSC)" },
>+	{ GSMTAP_TYPE_UM_BURST,	"GSM Um burst (MS<->BTS)" },
>+	{ 0,			NULL },
>+};
>+
>+/* dissect a SACCH L1 header which is included in the first 2 bytes
>+ * of every SACCH frame (according to TS 04.04) */
>+static void
>+dissect_sacch_l1h(tvbuff_t *tvb, proto_tree *tree)
>+{
>+	proto_item *ti;
>+	proto_tree *l1h_tree = NULL;
>+
>+	if (!tree)
>+		return;
>+
>+	ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, 2,
>+			"SACCH L1 Header, Power Level: %u, Timing Advance: %u",
>+			tvb_get_guint8(tvb, 0) & 0x1f,
>+			tvb_get_guint8(tvb, 1));
>+	l1h_tree = proto_item_add_subtree(ti, ett_gsmtap);
>+	/* Power Level */
>+	proto_tree_add_item(l1h_tree, hf_sacch_l1h_power_lev, tvb, 0, 1, FALSE);
>+	/* Fast Power Control */
>+	proto_tree_add_item(l1h_tree, hf_sacch_l1h_fpc, tvb, 0, 1, FALSE);
>+	/* Acutal Timing Advance */
>+	proto_tree_add_item(l1h_tree, hf_sacch_l1h_ta, tvb, 1, 1, FALSE);
>+}
>+
>+/* dissect a GSMTAP header and hand payload off to respective dissector */
>+static void
>+dissect_gsmtap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
>+{
>+	int sub_handle, len, offset = 0;
>+	proto_item *ti;
>+	proto_tree *gsmtap_tree = NULL;
>+	tvbuff_t *payload_tvb, *l1h_tvb = NULL;
>+	guint8 hdr_len, type, sub_type;
>+	guint16 arfcn;
>+
>+	len = tvb_length(tvb);
>+
>+	hdr_len = tvb_get_guint8(tvb, offset + 1) <<2;
>+	type = tvb_get_guint8(tvb, offset + 2);
>+	sub_type = tvb_get_guint8(tvb, offset + 12);
>+	arfcn = tvb_get_ntohs(tvb, offset + 4);
>+
>+	/* In case of a SACCH, there is a two-byte L1 header in front
>+	 * of the packet (see TS 04.04) */
>+	if (type == GSMTAP_TYPE_UM &&
>+	    sub_type & GSMTAP_CHANNEL_ACCH) {
>+		l1h_tvb = tvb_new_subset(tvb, hdr_len, 2, 2);
>+		payload_tvb = tvb_new_subset(tvb, hdr_len+2, len-(hdr_len+2),
>+					     len-(hdr_len+2));
>+	} else {
>+		payload_tvb = tvb_new_subset(tvb, hdr_len, len-hdr_len,
>+					     len-hdr_len);
>+	}
>+
>+	/* We don't want any UDP related info left in the INFO field, as the
>+	 * gsm_a_dtap dissector will not clear but only append */
>+	col_clear(pinfo->cinfo, COL_INFO);
>+
>+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "GSMTAP");
>+
>+	if (arfcn & GSMTAP_ARFCN_F_UPLINK) {
>+		col_append_str(pinfo->cinfo, COL_RES_NET_SRC, "MS");
>+		col_append_str(pinfo->cinfo, COL_RES_NET_DST, "BTS");
>+		/* p2p_dir is used by the LAPDm dissector */
>+		pinfo->p2p_dir = P2P_DIR_SENT;
>+	} else {
>+		col_set_str(pinfo->cinfo, COL_RES_NET_SRC, "BTS");
>+		switch (sub_type & ~GSMTAP_CHANNEL_ACCH) {
>+		case GSMTAP_CHANNEL_BCCH:
>+		case GSMTAP_CHANNEL_CCCH:
>+		case GSMTAP_CHANNEL_PCH:
>+		case GSMTAP_CHANNEL_AGCH:
>+			col_set_str(pinfo->cinfo, COL_RES_NET_DST, "Broadcast");
>+			break;
>+		default:
>+			col_set_str(pinfo->cinfo, COL_RES_NET_DST, "MS");
>+			break;
>+		}
>+		/* p2p_dir is used by the LAPDm dissector */
>+		pinfo->p2p_dir = P2P_DIR_RECV;
>+	}
>+
>+	if (tree) {
>+		ti = proto_tree_add_protocol_format(tree, proto_gsmtap, tvb, 0, hdr_len,
>+			"GSM TAP Header, ARFCN: %u (%s), TS: %u, Channel: %s (%u)",
>+			arfcn & GSMTAP_ARFCN_MASK,
>+			arfcn & GSMTAP_ARFCN_F_UPLINK ? "Uplink" : "Downlink",
>+			tvb_get_guint8(tvb, offset+3),
>+			match_strval(tvb_get_guint8(tvb, offset+12), gsmtap_channels),
>+			tvb_get_guint8(tvb, offset+14));
>+		gsmtap_tree = proto_item_add_subtree(ti, ett_gsmtap);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_version,
>+				    tvb, offset, 1, FALSE);
>+		proto_tree_add_uint_format(gsmtap_tree, hf_gsmtap_hdrlen,
>+				    tvb, offset+1, 1, hdr_len,
>+				    "Header length: %u bytes", hdr_len);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_type,
>+				    tvb, offset+2, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_timeslot,
>+				    tvb, offset+3, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_arfcn,
>+				    tvb, offset+4, 2, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_uplink,
>+				    tvb, offset+4, 2, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_noise_dbm,
>+				    tvb, offset+6, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_signal_dbm,
>+				    tvb, offset+7, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_frame_nr,
>+				    tvb, offset+8, 4, FALSE);
>+		if (type == GSMTAP_TYPE_UM_BURST)
>+			proto_tree_add_item(gsmtap_tree, hf_gsmtap_burst_type,
>+					    tvb, offset+12, 1, FALSE);
>+		else if (type == GSMTAP_TYPE_UM)
>+			proto_tree_add_item(gsmtap_tree, hf_gsmtap_channel_type,
>+					    tvb, offset+12, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_antenna,
>+				    tvb, offset+13, 1, FALSE);
>+		proto_tree_add_item(gsmtap_tree, hf_gsmtap_subslot,
>+				    tvb, offset+14, 1, FALSE);
>+	}
>+
>+	switch (type) {
>+	case GSMTAP_TYPE_UM:
>+		if (l1h_tvb)
>+			dissect_sacch_l1h(l1h_tvb, tree);
>+		switch (sub_type & ~GSMTAP_CHANNEL_ACCH) {
>+		case GSMTAP_CHANNEL_BCCH:
>+		case GSMTAP_CHANNEL_CCCH:
>+		case GSMTAP_CHANNEL_PCH:
>+		case GSMTAP_CHANNEL_AGCH:
>+			/* FIXME: we might want to skip idle frames */
>+			sub_handle = GSMTAP_SUB_UM;
>+			break;
>+		case GSMTAP_CHANNEL_SDCCH:
>+		case GSMTAP_CHANNEL_SDCCH4:
>+		case GSMTAP_CHANNEL_SDCCH8:
>+		case GSMTAP_CHANNEL_TCH_F:
>+		case GSMTAP_CHANNEL_TCH_H:
>+			sub_handle = GSMTAP_SUB_UM_LAPDM;
>+			break;
>+		case GSMTAP_CHANNEL_RACH:
>+		default:
>+			sub_handle = GSMTAP_SUB_DATA;
>+			break;
>+		}
>+		break;
>+	case GSMTAP_TYPE_UM_BURST:
>+	default:
>+		sub_handle = GSMTAP_SUB_DATA;
>+		break;
>+	}
>+	call_dissector(sub_handles[sub_handle], payload_tvb, pinfo, tree);
>+}
>+
>+static const true_false_string sacch_l1h_fpc_mode_vals = {
>+	"In use",
>+	"Not in use"
>+};
>+
>+void
>+proto_register_gsmtap(void)
>+{
>+	static hf_register_info hf[] = {
>+		{ &hf_gsmtap_version, { "Version", "gsmtap.version",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_hdrlen, { "Header Length", "gsmtap.hdr_len",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_type, { "Payload Type", "gsmtap.type",
>+		  FT_UINT8, BASE_DEC, VALS(gsmtap_types), 0, NULL, HFILL } },
>+		{ &hf_gsmtap_timeslot, { "Time Slot", "gsmtap.ts",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_arfcn, { "ARFCN", "gsmtap.arfcn",
>+		  FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_MASK, NULL, HFILL } },
>+		{ &hf_gsmtap_uplink, { "Uplink", "gsmtap.uplink",
>+		  FT_UINT16, BASE_DEC, NULL, GSMTAP_ARFCN_F_UPLINK, NULL, HFILL } },
>+		{ &hf_gsmtap_noise_dbm, { "Signal/Noise Ratio (dB)", "gsmtap.snr_db",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_signal_dbm, { "Signal Level (dBm)", "gsmtap.signal_dbm",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_frame_nr, { "GSM Frame Number", "gsmtap.frame_nr",
>+		  FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &hf_gsmtap_burst_type, { "Burst Type", "gsmtap.burst_type",
>+		  FT_UINT8, BASE_DEC, VALS(gsmtap_bursts), 0, NULL, HFILL }},
>+		{ &hf_gsmtap_channel_type, { "Channel Type", "gsmtap.chan_type",
>+		  FT_UINT8, BASE_DEC, VALS(gsmtap_channels), 0, NULL, HFILL }},
>+		{ &hf_gsmtap_antenna, { "Antenna Number", "gsmtap.antenna",
>+		  FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
>+		{ &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);
>+}
>Index: epan/dissectors/packet-gsmtap.h
>===================================================================
>--- /dev/null
>+++ epan/dissectors/packet-gsmtap.h
>@@ -0,0 +1,70 @@
>+#ifndef _GSMTAP_H
>+#define _GSMTAP_H
>+
>+/* gsmtap header, pseudo-header in front of the actua/ GSM payload */
>+
>+/* GSMTAP is a generic header format for GSM protocol captures,
>+ * it uses the IANA-assigned UDP port number 4729 and carries
>+ * payload in various formats of GSM interfaces such as Um MAC
>+ * blocks or Um bursts.
>+ *
>+ * Example programs generating GSMTAP data are airprobe
>+ * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/)
>+ */
>+
>+#define GSMTAP_TYPE_UM		0x01
>+#define GSMTAP_TYPE_ABIS	0x02
>+#define GSMTAP_TYPE_UM_BURST	0x03	/* raw burst bits */
>+
>+#define GSMTAP_BURST_UNKNOWN		0x00
>+#define GSMTAP_BURST_FCCH		0x01
>+#define GSMTAP_BURST_PARTIAL_SCH	0x02
>+#define GSMTAP_BURST_SCH		0x03
>+#define GSMTAP_BURST_CTS_SCH		0x04
>+#define GSMTAP_BURST_COMPACT_SCH	0x05
>+#define GSMTAP_BURST_NORMAL		0x06
>+#define GSMTAP_BURST_DUMMY		0x07
>+#define GSMTAP_BURST_ACCESS		0x08
>+#define GSMTAP_BURST_NONE		0x09
>+
>+#define GSMTAP_CHANNEL_UNKNOWN	0x00
>+#define GSMTAP_CHANNEL_BCCH	0x01
>+#define GSMTAP_CHANNEL_CCCH	0x02
>+#define GSMTAP_CHANNEL_RACH	0x03
>+#define GSMTAP_CHANNEL_AGCH	0x04
>+#define GSMTAP_CHANNEL_PCH	0x05
>+#define GSMTAP_CHANNEL_SDCCH	0x06
>+#define GSMTAP_CHANNEL_SDCCH4	0x07
>+#define GSMTAP_CHANNEL_SDCCH8	0x08
>+#define GSMTAP_CHANNEL_TCH_F	0x09
>+#define GSMTAP_CHANNEL_TCH_H	0x0a
>+#define GSMTAP_CHANNEL_ACCH	0x80
>+
>+#define GSMTAP_ARFCN_F_PCS	0x8000
>+#define GSMTAP_ARFCN_F_UPLINK	0x4000
>+#define GSMTAP_ARFCN_MASK	0x3fff
>+
>+#define GSMTAP_UDP_PORT			4729
>+
>+/* This is the header as it is used by gsmtap-generating software.
>+ * It is not used by the wireshark dissector and provided for reference only.
>+struct gsmtap_hdr {
>+	guint8 version;		// version, set to 0x01 currently
>+	guint8 hdr_len;		// length in number of 32bit words
>+	guint8 type;		// see GSMTAP_TYPE_*
>+	guint8 timeslot;	// timeslot (0..7 on Um)
>+
>+	guint16 arfcn;		// ARFCN (frequency)
>+	gint8 signal_dbm;	// signal level in dBm
>+	gint8 snr_db;		// signal/noise ratio in dB
>+
>+	guint32 frame_number;	// GSM Frame Number (FN)
>+
>+	guint8 sub_type;	// Type of burst/channel, see above
>+	guint8 antenna_nr;	// Antenna Number
>+	guint8 sub_slot;	// sub-slot within timeslot
>+	guint8 res;		// reserved for future use (RFU)
>+}
>+ */
>+
>+#endif /* _GSMTAP_H */
>Index: epan/dissectors/Makefile.common
>===================================================================
>--- epan/dissectors/Makefile.common.orig
>+++ epan/dissectors/Makefile.common
>@@ -484,6 +484,7 @@
> 	packet-gsm_sms.c	\
> 	packet-gsm_sms_ud.c	\
> 	packet-gsm_um.c	\
>+	packet-gsmtap.c		\
> 	packet-gssapi.c		\
> 	packet-gtp.c		\
> 	packet-gtpv2.c		\
>@@ -1072,6 +1073,7 @@
> 	packet-gsm_a_common.h	\
> 	packet-gsm_map.h	\
> 	packet-gsm_sms.h	\
>+	packet-gsmtap.h		\
> 	packet-gssapi.h	\
> 	packet-gtp.h	\
> 	packet-h223.h	\

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