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/* packet-osmo_trx_burst.c
* Dissector for Osmocom TRX Protocol (between osmo-trx and osmo-bts-trx)
*
* (C) 2018 by Harald Welte <laforge@gnumonks.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/conversation.h>
#include "packet-e164.h"
#include "packet-e212.h"
#include "packet-dns.h"
/* This protocol is a non-standard, ad-hoc protocol to pass baseband GSM bursts
* between the modem (osmo-trx) and the encoder/decoder (osmo-bts-trx).
*/
/* the TRX-side control interface for C(N) is on port P=B+2N+1;
* the corresponding core-side interface for every socket is at P+100
* Give a base port B (5700), the master clock interface is at port P=B */
#define OTRXC_UDP_PORTS "5701,5703,5800,5801,5803"
/* the data interface is on an odd numbered port P=B+2N+2 */
#define OTRXB_TX_UDP_PORTS "5702,5704"
/* the corresponding core-side interface for every socket is at P+100 */
#define OTRXB_RX_UDP_PORTS "5802,5804"
static int proto_otrx_b_tx = -1;
static int proto_otrx_b_rx = -1;
static int proto_otrx_c = -1;
static int hf_otrxb_timeslot = -1;
static int hf_otrxb_frame_nr = -1;
static int hf_otrxb_rssi = -1;
static int hf_otrxb_timing_offset = -1;
static int hf_otrxb_soft_symbols = -1;
static int hf_otrxb_tx_att = -1;
static int hf_otrxb_hard_symbols = -1;
static int hf_otrxc_type = -1;
static int hf_otrxc_verb = -1;
static int hf_otrxc_params = -1;
static int hf_otrxc_status = -1;
static gint ett_otrxb = -1;
/* Burst data in Receive direction */
static int dissect_otrx_b_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int len, offset = 0;
proto_item *ti;
proto_tree *otrxb_tree = NULL;
const char *str;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ORX-B-Rx");
col_clear(pinfo->cinfo, COL_INFO);
len = tvb_reported_length(tvb);
if (tree) {
str = "FOO";
ti = proto_tree_add_protocol_format(tree, proto_otrx_b_tx, tvb, 0, len,
"OsmoTRX Tx Burst %s", str);
otrxb_tree = proto_item_add_subtree(ti, ett_otrxb);
proto_tree_add_item(otrxb_tree, hf_otrxb_timeslot, tvb, offset, 1, ENC_NA);
offset++;
proto_tree_add_item(otrxb_tree, hf_otrxb_frame_nr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(otrxb_tree, hf_otrxb_rssi, tvb, offset, 1, ENC_NA);
offset++;
proto_tree_add_item(otrxb_tree, hf_otrxb_timing_offset, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(otrxb_tree, hf_otrxb_soft_symbols, tvb, offset, 148, ENC_NA);
}
return tvb_captured_length(tvb);
}
/* Burst data in Transmit direction */
static int dissect_otrx_b_tx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int len, offset = 0;
proto_item *ti;
proto_tree *otrxb_tree = NULL;
guint8 ts;
guint32 fn;
guint8 tx_att;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "OTRX-B-Tx");
col_clear(pinfo->cinfo, COL_INFO);
len = tvb_reported_length(tvb);
ts = tvb_get_guint8(tvb, 0);
fn = tvb_get_ntohl(tvb, 1);
tx_att = tvb_get_guint8(tvb, 5);
col_add_fstr(pinfo->cinfo, COL_INFO, "Tx TS=%d, FN=%u, TX_ATT=%u", ts, fn, tx_att);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_otrx_b_rx, tvb, 0, len,
"OsmoTRX Rx Burst (TS=%d, FN=%u, TX_ATT=%u)",
ts, fn, tx_att);
otrxb_tree = proto_item_add_subtree(ti, ett_otrxb);
proto_tree_add_item(otrxb_tree, hf_otrxb_timeslot, tvb, offset, 1, ENC_NA);
offset++;
proto_tree_add_item(otrxb_tree, hf_otrxb_frame_nr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(otrxb_tree, hf_otrxb_tx_att, tvb, offset, 1, ENC_NA);
offset++;
proto_tree_add_item(otrxb_tree, hf_otrxb_hard_symbols, tvb, offset, 148, ENC_NA);
}
return tvb_captured_length(tvb);
}
/* Burst data in Transmit direction */
static int dissect_otrx_c(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0, len;
proto_item *ti;
proto_tree *otrxc_tree = NULL;
const char *str, *chr, *pos, *type;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "OTRX-C");
col_clear(pinfo->cinfo, COL_INFO);
len = tvb_reported_length(tvb);
str = tvb_get_string_enc(wmem_packet_scope(), tvb, 0, len, ENC_ASCII);
col_set_str(pinfo->cinfo, COL_INFO, str);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_otrx_c, tvb, 0, len,
"OsmoTRX Control: %s", str);
otrxc_tree = proto_item_add_subtree(ti, ett_otrxb);
proto_tree_add_item(otrxc_tree, hf_otrxc_type, tvb, offset, 3, ENC_ASCII|ENC_NA);
type = str + offset;
offset += 3 + 1;
pos = str+offset;
chr = strchr(pos, ' ');
if (!chr)
goto out;
proto_tree_add_item(otrxc_tree, hf_otrxc_verb, tvb, offset, chr-pos, ENC_ASCII|ENC_NA);
offset += chr-pos + 1;
if (offset >= len)
goto out;
if (!strncmp(type, "RSP", 3)) {
pos = str+offset;
chr = strchr(pos, ' ');
if (!chr)
goto out;
proto_tree_add_item(otrxc_tree, hf_otrxc_status, tvb, offset, chr-pos, ENC_ASCII|ENC_NA);
offset += chr-pos + 1;
}
if (offset >= len)
goto out;
proto_tree_add_item(otrxc_tree, hf_otrxc_params, tvb, offset, len-offset, ENC_ASCII|ENC_NA);
}
out:
return tvb_captured_length(tvb);
}
void
proto_register_otrxb(void)
{
static hf_register_info hf[] = {
{ &hf_otrxb_timeslot, { "Timeslot", "osmo_trx.burst.timeslot",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_frame_nr, { "GSM Frame Number", "osmo_trx.burst.frame_nr",
FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_rssi, { "RSSI (-dBm)", "osmo_trx.burst.rssi",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_timing_offset, { "Correlator Timing Offset (1/256 symbols)", "osmo_trx.burst.timing_offset",
FT_INT16, BASE_DEC, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_soft_symbols, { "Soft Symbols", "osmo_trx.burst.soft-symbols",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_tx_att, { "Tx Attenuation (dB)", "osmo_trx.burst.tx-atten",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
{ &hf_otrxb_hard_symbols, { "Hard Symbols", "osmo_trx.burst.hard-symbols",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
{ &hf_otrxc_type, { "Type", "osmo_trx.ctrl.type",
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
{ &hf_otrxc_verb, { "Verb", "osmo_trx.ctrl.verb",
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
{ &hf_otrxc_params, { "Parameters", "osmo_trx.ctrl.params",
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
{ &hf_otrxc_status, { "Status", "osmo_trx.ctrl.status",
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
};
static gint *ett[] = {
&ett_otrxb,
};
proto_otrx_b_tx = proto_register_protocol("Osmocom TRX Burst Protocol (Tx)",
"otrx_b_tx", "otrx_b_tx");
proto_otrx_b_rx = proto_register_protocol("Osmocom TRX Burst Protocol (Rx)",
"otrx_b_rx", "otrx_b_rx");
proto_otrx_c = proto_register_protocol("Osmocom TRX Control Protocol", "otrx_c", "otrx_c");
proto_register_field_array(proto_otrx_c, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_otrxb(void)
{
dissector_handle_t otrxb_tx_handle, otrxb_rx_handle, otrxc_handle;
otrxb_tx_handle = create_dissector_handle(dissect_otrx_b_tx, proto_otrx_b_tx);
otrxb_rx_handle = create_dissector_handle(dissect_otrx_b_rx, proto_otrx_b_rx);
otrxc_handle = create_dissector_handle(dissect_otrx_c, proto_otrx_c);
dissector_add_uint_range_with_preference("udp.port", OTRXB_TX_UDP_PORTS, otrxb_tx_handle);
dissector_add_uint_range_with_preference("udp.port", OTRXB_RX_UDP_PORTS, otrxb_rx_handle);
dissector_add_uint_range_with_preference("udp.port", OTRXC_UDP_PORTS, otrxc_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:
*/
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