forked from osmocom/wireshark
Add dissector for OsmoTRX protocol
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). Osmocom inherited this when forking OsmoTRX off the OpenBTS "Transceiver" program. Change-Id: I31f5071d08eff1731f1d602886e204c87eed107c
This commit is contained in:
parent
7580784d4b
commit
66a26f2569
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@ -67,6 +67,8 @@ TPM 2.0 protocol
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--
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GSM-R protocol (User-to-User Information Element usage)
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--
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OsmoTRX Protocol (raw GSM burst data between osmo-trx and osmo-bts-trx)
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--
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=== Updated Protocol Support
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@ -1460,6 +1460,7 @@ set(DISSECTOR_SRC
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osi-options.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osi.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-ositp.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osmo_trx.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-ospf.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-ossp.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-ouch.c
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@ -0,0 +1,264 @@
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/* packet-osmo_trx.c
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* Dissector for Osmocom TRX Protocol (between osmo-trx and osmo-bts-trx)
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*
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include "packet-e164.h"
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#include "packet-e212.h"
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#include "packet-dns.h"
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/* This protocol is a non-standard, ad-hoc protocol to pass baseband GSM bursts
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* between the modem (osmo-trx) and the encoder/decoder (osmo-bts-trx). Osmocom
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* inherited this when forking OsmoTRX off the OpenBTS "Transceiver" program.
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*/
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/* the TRX-side control interface for C(N) is on port P=B+2N+1;
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* the corresponding core-side interface for every socket is at P+100
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* Give a base port B (5700), the master clock interface is at port P=B */
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#define OTRXC_UDP_PORTS "5701,5703,5800,5801,5803"
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/* the data interface is on an odd numbered port P=B+2N+2 */
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#define OTRXB_TX_UDP_PORTS "5702,5704"
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/* the corresponding core-side interface for every socket is at P+100 */
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#define OTRXB_RX_UDP_PORTS "5802,5804"
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static int proto_otrx_b_tx = -1;
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static int proto_otrx_b_rx = -1;
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static int proto_otrx_c = -1;
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static int hf_otrxb_timeslot = -1;
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static int hf_otrxb_frame_nr = -1;
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static int hf_otrxb_rssi = -1;
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static int hf_otrxb_timing_offset = -1;
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static int hf_otrxb_soft_symbols = -1;
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static int hf_otrxb_tx_att = -1;
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static int hf_otrxb_hard_symbols = -1;
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static int hf_otrxc_type = -1;
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static int hf_otrxc_verb = -1;
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static int hf_otrxc_params = -1;
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static int hf_otrxc_status = -1;
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static gint ett_otrxb = -1;
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/* Burst data in Receive direction */
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static int dissect_otrx_b_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int len, offset = 0;
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proto_item *ti;
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proto_tree *otrxb_tree = NULL;
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guint8 ts, rssi;
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guint32 fn;
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gint16 toa;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ORX-B-Rx");
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col_clear(pinfo->cinfo, COL_INFO);
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len = tvb_reported_length(tvb);
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ts = tvb_get_guint8(tvb, 0);
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fn = tvb_get_ntohl(tvb, 1);
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rssi = tvb_get_guint8(tvb, 5);
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toa = tvb_get_ntohs(tvb, 6);
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col_add_fstr(pinfo->cinfo, COL_INFO, "Rx TS=%u, FN=%u, RSSI=%u, ToA=%d", ts, fn, rssi, toa);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_otrx_b_tx, tvb, 0, len,
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"OsmoTRX Tx Burst (TS=%d, FN=%u, RSSI=%u, ToA=%d)",
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ts, fn, rssi, toa);
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otrxb_tree = proto_item_add_subtree(ti, ett_otrxb);
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proto_tree_add_item(otrxb_tree, hf_otrxb_timeslot, tvb, offset, 1, ENC_NA);
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offset++;
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proto_tree_add_item(otrxb_tree, hf_otrxb_frame_nr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(otrxb_tree, hf_otrxb_rssi, tvb, offset, 1, ENC_NA);
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offset++;
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proto_tree_add_item(otrxb_tree, hf_otrxb_timing_offset, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(otrxb_tree, hf_otrxb_soft_symbols, tvb, offset, 148, ENC_NA);
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}
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return tvb_captured_length(tvb);
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}
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/* Burst data in Transmit direction */
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static int dissect_otrx_b_tx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int len, offset = 0;
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proto_item *ti;
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proto_tree *otrxb_tree = NULL;
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guint8 ts;
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guint32 fn;
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guint8 tx_att;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "OTRX-B-Tx");
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col_clear(pinfo->cinfo, COL_INFO);
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len = tvb_reported_length(tvb);
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ts = tvb_get_guint8(tvb, 0);
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fn = tvb_get_ntohl(tvb, 1);
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tx_att = tvb_get_guint8(tvb, 5);
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tx TS=%d, FN=%u, TX_ATT=%u", ts, fn, tx_att);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_otrx_b_rx, tvb, 0, len,
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"OsmoTRX Rx Burst (TS=%d, FN=%u, TX_ATT=%u)",
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ts, fn, tx_att);
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otrxb_tree = proto_item_add_subtree(ti, ett_otrxb);
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proto_tree_add_item(otrxb_tree, hf_otrxb_timeslot, tvb, offset, 1, ENC_NA);
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offset++;
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proto_tree_add_item(otrxb_tree, hf_otrxb_frame_nr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(otrxb_tree, hf_otrxb_tx_att, tvb, offset, 1, ENC_NA);
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offset++;
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proto_tree_add_item(otrxb_tree, hf_otrxb_hard_symbols, tvb, offset, 148, ENC_NA);
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}
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return tvb_captured_length(tvb);
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}
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/* Burst data in Transmit direction */
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static int dissect_otrx_c(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0, len;
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proto_item *ti;
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proto_tree *otrxc_tree = NULL;
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const char *str, *chr, *pos, *type;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "OTRX-C");
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col_clear(pinfo->cinfo, COL_INFO);
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len = tvb_reported_length(tvb);
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str = tvb_get_string_enc(wmem_packet_scope(), tvb, 0, len, ENC_ASCII);
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col_set_str(pinfo->cinfo, COL_INFO, str);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_otrx_c, tvb, 0, len,
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"OsmoTRX Control: %s", str);
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otrxc_tree = proto_item_add_subtree(ti, ett_otrxb);
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proto_tree_add_item(otrxc_tree, hf_otrxc_type, tvb, offset, 3, ENC_ASCII|ENC_NA);
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type = str + offset;
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offset += 3 + 1;
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pos = str+offset;
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chr = strchr(pos, ' ');
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if (!chr)
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goto out;
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proto_tree_add_item(otrxc_tree, hf_otrxc_verb, tvb, offset, (guint)(chr-pos),
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ENC_ASCII|ENC_NA);
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offset += (gint) (chr-pos) + 1;
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if (offset >= len)
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goto out;
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if (!strncmp(type, "RSP", 3)) {
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pos = str+offset;
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chr = strchr(pos, ' ');
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if (!chr)
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goto out;
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proto_tree_add_item(otrxc_tree, hf_otrxc_status, tvb, offset, (guint)(chr-pos),
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ENC_ASCII|ENC_NA);
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offset += (gint) (chr-pos) + 1;
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}
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if (offset >= len)
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goto out;
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proto_tree_add_item(otrxc_tree, hf_otrxc_params, tvb, offset, len-offset,
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ENC_ASCII|ENC_NA);
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}
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out:
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return tvb_captured_length(tvb);
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}
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void
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proto_register_otrxb(void)
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{
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static hf_register_info hf[] = {
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{ &hf_otrxb_timeslot, { "Timeslot", "osmo_trx.burst.timeslot",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_frame_nr, { "GSM Frame Number", "osmo_trx.burst.frame_nr",
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FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_rssi, { "RSSI (-dBm)", "osmo_trx.burst.rssi",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_timing_offset, { "Correlator Timing Offset (1/256 symbols)", "osmo_trx.burst.timing_offset",
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FT_INT16, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_soft_symbols, { "Soft Symbols", "osmo_trx.burst.soft-symbols",
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FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_tx_att, { "Tx Attenuation (dB)", "osmo_trx.burst.tx-atten",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_otrxb_hard_symbols, { "Hard Symbols", "osmo_trx.burst.hard-symbols",
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FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_otrxc_type, { "Type", "osmo_trx.ctrl.type",
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FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_otrxc_verb, { "Verb", "osmo_trx.ctrl.verb",
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FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_otrxc_params, { "Parameters", "osmo_trx.ctrl.params",
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FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_otrxc_status, { "Status", "osmo_trx.ctrl.status",
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FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
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};
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static gint *ett[] = {
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&ett_otrxb,
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};
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proto_otrx_b_tx = proto_register_protocol("Osmocom TRX Burst Protocol (Tx)",
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"otrx_b_tx", "otrx_b_tx");
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proto_otrx_b_rx = proto_register_protocol("Osmocom TRX Burst Protocol (Rx)",
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"otrx_b_rx", "otrx_b_rx");
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proto_otrx_c = proto_register_protocol("Osmocom TRX Control Protocol", "otrx_c", "otrx_c");
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proto_register_field_array(proto_otrx_c, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_otrxb(void)
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{
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dissector_handle_t otrxb_tx_handle, otrxb_rx_handle, otrxc_handle;
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otrxb_tx_handle = create_dissector_handle(dissect_otrx_b_tx, proto_otrx_b_tx);
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otrxb_rx_handle = create_dissector_handle(dissect_otrx_b_rx, proto_otrx_b_rx);
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otrxc_handle = create_dissector_handle(dissect_otrx_c, proto_otrx_c);
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dissector_add_uint_range_with_preference("udp.port", OTRXB_TX_UDP_PORTS, otrxb_tx_handle);
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dissector_add_uint_range_with_preference("udp.port", OTRXB_RX_UDP_PORTS, otrxb_rx_handle);
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dissector_add_uint_range_with_preference("udp.port", OTRXC_UDP_PORTS, otrxc_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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