634 lines
17 KiB
C
634 lines
17 KiB
C
/* packet-tetra.c
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* Routines for TETRA packet dissection
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*
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* Copyright (c) 2007 - 2011 Professional Mobile Communication Research Group,
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* Beijing Institute of Technology, China
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* Copyright (c) 2011 Holger Hans Peter Freyther
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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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* REF: ETSI EN 300 392-2 V3.2.1
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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/expert.h>
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#include <epan/prefs.h>
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#include <epan/oids.h>
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#include <epan/conversation.h>
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#include <epan/asn1.h>
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#include "packet-per.h"
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#include "packet-tetra.h"
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#define PROTO_TAG_tetra "TETRA"
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void proto_register_tetra(void);
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void proto_reg_handoff_tetra(void);
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/* Wireshark ID of the tetra protocol */
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static int proto_tetra = -1;
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static dissector_handle_t tetra_handle;
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#define TETRA_UDP_PORT 7074 /* Not IANA assigned */
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/* Whether the capture data include carrier numbers */
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static gboolean include_carrier_number = TRUE;
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/* The following hf_* variables are used to hold the Wireshark IDs of
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* our header fields; they are filled out when we call
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* proto_register_field_array() in proto_register_tetra()
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*/
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/** Kts attempt at defining the protocol */
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static gint hf_tetra = -1;
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static gint hf_tetra_header = -1;
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static gint hf_tetra_channels = -1;
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static gint hf_tetra_channel1 = -1;
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static gint hf_tetra_channel2 = -1;
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static gint hf_tetra_channel3 = -1;
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static gint hf_tetra_txreg = -1;
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static gint hf_tetra_timer = -1;
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static gint hf_tetra_pdu = -1;
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static gint hf_tetra_rvstr = -1;
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static gint hf_tetra_carriernumber = -1;
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static gint hf_tetra_rxchannel1 = -1;
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static gint hf_tetra_rxchannel2 = -1;
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static gint hf_tetra_rxchannel3 = -1;
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static gint hf_tetra_crc = -1;
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static gint hf_tetra_len0 = -1;
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#include "packet-tetra-hf.c"
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/* Initialize the subtree pointers */
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/* These are the ids of the subtrees that we may be creating */
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static gint ett_tetra = -1;
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static gint ett_tetra_header = -1;
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static gint ett_tetra_length = -1;
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static gint ett_tetra_txreg = -1;
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static gint ett_tetra_text = -1;
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#include "packet-tetra-ett.c"
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static expert_field ei_tetra_channels_incorrect = EI_INIT;
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#include "packet-tetra-fn.c"
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static const value_string channeltypenames[] = {
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{ 0, "Reserved" },
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{ 1, "AACH" },
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{ 2, "SCH/F" },
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{ 3, "SCH/HD" },
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{ 4, "Unknown" },
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{ 5, "BSCH" },
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{ 6, "BNCH" },
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{ 7, "TCH/F" },
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{ 8, "TCH/H" },
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{ 9, "TCH4.8"},
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{ 10, "TCH7.2"},
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{ 11, "STCH"},
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{ 0, NULL }
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};
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static const value_string recvchanneltypenames[] = {
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{ 0, "Reserved" },
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{ 1, "AACH" },
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{ 2, "SCH/F" },
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{ 3, "SCH/HD" },
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{ 4, "Unknown" },
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{ 5, "BSCH" },
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{ 6, "BNCH" },
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{ 7, "TCH/F" },
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{ 8, "TCH/H" },
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{ 9, "TCH4.8"},
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{ 10, "TCH7.2"},
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{ 11, "STCH"},
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{ 15, "SCH/HU"},
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{ 0, NULL }
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};
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/* Get the length of received pdu */
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static gint get_rx_pdu_length(guint32 channel_type)
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{
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gint len = 0;
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switch(channel_type) {
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case TETRA_CHAN_AACH:
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len = 14;
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break;
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case TETRA_CHAN_SCH_F:
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len = 268;
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break;
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case TETRA_CHAN_SCH_D:
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len = 124; ;
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break;
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case TETRA_CHAN_BSCH:
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len = 60;
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break;
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case TETRA_CHAN_BNCH:
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len = 124;
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break;
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case TETRA_CHAN_TCH_F:
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len = 274;
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break;
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case TETRA_CHAN_TCH_H:
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len = 137;
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break;
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case TETRA_CHAN_TCH_2_4:
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len = 144;
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break;
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case TETRA_CHAN_TCH_4_8:
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len = 288;
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break;
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case TETRA_CHAN_STCH:
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len = 124;
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break;
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case TETRA_CHAN_SCH_HU:
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len = 92;
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break;
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default:
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len = 0;
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break;
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}
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return len;
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}
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/* Get the length of transmitted pdu */
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static gint get_tx_pdu_length(guint32 channel_type)
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{
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gint len = 0;
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switch(channel_type) {
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case TETRA_CHAN_AACH:
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len = 14;
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break;
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case TETRA_CHAN_SCH_F:
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len = 268;
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break;
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case TETRA_CHAN_SCH_D:
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len = 124;
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break;
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case TETRA_CHAN_BSCH:
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len = 60;
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break;
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case TETRA_CHAN_BNCH:
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len = 124;
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break;
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case TETRA_CHAN_TCH_F:
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len = 274;
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break;
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case TETRA_CHAN_TCH_H:
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len = 137;
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break;
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case TETRA_CHAN_TCH_2_4:
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len = 144;
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break;
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case TETRA_CHAN_TCH_4_8:
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len = 288;
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break;
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case TETRA_CHAN_STCH:
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len = 124;
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break;
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}
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return len;
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}
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void tetra_dissect_pdu(int channel_type, int dir, tvbuff_t *pdu, proto_tree *tree, packet_info *pinfo)
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{
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proto_item *tetra_sub_item;
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proto_tree *tetra_sub_tree;
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guint8 p;
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tetra_sub_item = proto_tree_add_item(tree, hf_tetra_pdu,
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pdu, 0, tvb_captured_length(pdu), ENC_NA);
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tetra_sub_tree = proto_item_add_subtree(tetra_sub_item, ett_tetra);
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switch(channel_type) {
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case TETRA_CHAN_AACH:
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dissect_AACH_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case TETRA_CHAN_SCH_F:
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p = tvb_get_guint8(pdu, 0);
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switch(p >> 6) {
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case 0:
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if (dir == TETRA_DOWNLINK)
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dissect_MAC_RESOURCE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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else
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dissect_MAC_DATA_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 1: /* MAC-FRAG or MAC-END */
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if((p >> 5) == 3) {
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if (dir == TETRA_DOWNLINK)
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dissect_MAC_END_DOWNLINK_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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else
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dissect_MAC_END_UPLINK_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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} else
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dissect_MAC_FRAG_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 2:
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dissect_MAC_ACCESS_DEFINE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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}
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break;
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case TETRA_CHAN_SCH_D:
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p = tvb_get_guint8(pdu, 0);
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switch(p >> 6) {
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case 0:
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dissect_MAC_RESOURCE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 1: /* MAC-FRAG or MAC-END */
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if((p >> 5) == 3)
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dissect_MAC_END_DOWN111_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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else
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dissect_MAC_FRAG120_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 2:
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dissect_MAC_ACCESS_DEFINE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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}
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break;
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case TETRA_CHAN_SCH_HU:
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p = tvb_get_guint8(pdu, 0);
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switch(p >> 7) {
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case 0: /* MAC-ACCESS */
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dissect_MAC_ACCESS_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 1: /* MAC-END-HU */
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dissect_MAC_END_HU_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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}
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break;
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case TETRA_CHAN_BSCH:
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col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "BSCH");
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dissect_BSCH_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case TETRA_CHAN_BNCH:
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col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "BNCH");
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dissect_BNCH_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case TETRA_CHAN_STCH:
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p = tvb_get_guint8(pdu, 0);
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switch(p >> 6) {
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case 0:
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dissect_MAC_RESOURCE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 1: /* MAC-FRAG or MAC-END */
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if((p >> 5) == 3) {
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if (dir == TETRA_DOWNLINK)
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dissect_MAC_END_DOWN111_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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else
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dissect_MAC_END_UP114_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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} else
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dissect_MAC_FRAG120_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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case 2:
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dissect_MAC_ACCESS_DEFINE_PDU(pdu, pinfo, tetra_sub_tree, NULL);
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break;
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}
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break;
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case TETRA_CHAN_TCH_F:
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col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Voice");
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break;
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}
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}
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static void dissect_tetra_UNITDATA_IND(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tetra_tree, int offset)
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{
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guint32 rxreg = 0;
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guint32 channels = 0, i;
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guint32 channel_type;
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gint pdu_offset = 0;
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proto_item *tetra_sub_item;
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proto_tree *tetra_header_tree = NULL;
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tvbuff_t *payload_tvb;
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/* Length */
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rxreg = tvb_get_letohl(tvb, offset);
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proto_tree_add_uint(tetra_tree, hf_tetra_len0, tvb, offset, 4, rxreg);
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/* RvSteR */
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offset += 4;
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rxreg = tvb_get_letohl(tvb, offset);
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proto_tree_add_uint(tetra_tree, hf_tetra_rvstr, tvb, offset, 4, rxreg);
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/* Logical channels */
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channels = rxreg & 0x3;
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tetra_sub_item = proto_tree_add_uint( tetra_tree, hf_tetra_channels, tvb, offset, 4, channels );
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tetra_header_tree = proto_item_add_subtree(tetra_sub_item, ett_tetra);
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if (channels > 3) {
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expert_add_info(pinfo, tetra_sub_item, &ei_tetra_channels_incorrect);
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channels = 3;
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}
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pdu_offset = offset + 4;
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for(i = 0; i < channels; i++) {
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gint byte_len, bits_len, remaining_bits;
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gint hf_channel[3];
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hf_channel[0] = hf_tetra_rxchannel1;
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hf_channel[1] = hf_tetra_rxchannel2;
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hf_channel[2] = hf_tetra_rxchannel3;
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/* Channel type */
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channel_type = (rxreg >> ((i + 1) * 4) ) & 0xf;
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proto_tree_add_uint( tetra_header_tree, hf_channel[i], tvb, offset, 4, channel_type);
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/* CRC */
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proto_tree_add_boolean( tetra_header_tree, hf_tetra_crc, tvb, offset, 4, !(rxreg >> (i + 2) & 0x01));
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/* PDU */
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bits_len = get_rx_pdu_length(channel_type);
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byte_len = bits_len >> 3;
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remaining_bits = bits_len % 8;
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if ((remaining_bits)!=0)
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byte_len++;
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payload_tvb = tvb_new_subset_length(tvb, pdu_offset, byte_len);
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tetra_dissect_pdu(channel_type, TETRA_UPLINK, payload_tvb, tetra_header_tree, pinfo);
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if ((remaining_bits)!=0)
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byte_len--;
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pdu_offset += byte_len;
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}
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}
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static void dissect_tetra_UNITDATA_REQ(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tetra_tree, int offset)
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{
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guint32 txreg = 0;
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guint32 channels = 0, i;
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guint32 channel_type;
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gint pdu_offset = 0;
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proto_item *tetra_sub_item = NULL;
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proto_tree *tetra_header_tree = NULL;
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tvbuff_t *payload_tvb;
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/* TxR */
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txreg = tvb_get_letohl(tvb, offset);
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proto_tree_add_uint(tetra_tree, hf_tetra_txreg, tvb, offset, 4, txreg);
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/* Logical channels */
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channels = (txreg & 0x3) + 1;
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tetra_sub_item = proto_tree_add_uint( tetra_tree, hf_tetra_channels, tvb, offset, 4, channels );
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tetra_header_tree = proto_item_add_subtree(tetra_sub_item, ett_tetra);
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txreg >>= 2;
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/* Skip 0000B */
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if(channels == 2)
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txreg >>= 4;
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if (channels > 3) {
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expert_add_info(pinfo, tetra_sub_item, &ei_tetra_channels_incorrect);
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channels = 3;
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}
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pdu_offset = offset + 4;
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for(i = 0; i < channels; i++) {
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gint byte_len, bits_len, remaining_bits;
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gint hf_channel[3];
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hf_channel[0] = hf_tetra_channel1;
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hf_channel[1] = hf_tetra_channel2;
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hf_channel[2] = hf_tetra_channel3;
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channel_type = txreg & 0xf;
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proto_tree_add_uint( tetra_header_tree, hf_channel[i], tvb, offset, 4, channel_type);
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txreg >>= 4;
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/* PDU */
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bits_len = get_tx_pdu_length(channel_type);
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byte_len = bits_len >> 3;
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remaining_bits = bits_len % 8;
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if ((remaining_bits)!=0)
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byte_len++;
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payload_tvb = tvb_new_subset_length(tvb, pdu_offset, byte_len);
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tetra_dissect_pdu(channel_type, TETRA_DOWNLINK, payload_tvb, tetra_header_tree, pinfo);
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pdu_offset += byte_len;
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}
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}
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static int
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dissect_tetra(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *tetra_item = NULL;
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proto_item *tetra_sub_item = NULL;
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proto_tree *tetra_tree = NULL;
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proto_tree *tetra_header_tree = NULL;
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guint16 type = 0;
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guint8 carriernumber = -1;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_tetra);
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/* Clear out stuff in the info column */
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col_clear(pinfo->cinfo,COL_INFO);
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/*
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* This is not a good way of dissecting packets. The tvb length should
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* be sanity checked so we aren't going past the actual size of the buffer.
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*/
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type = tvb_get_guint8(tvb, 0);
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if(include_carrier_number) {
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carriernumber = tvb_get_guint8(tvb, 1);
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}
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switch(type) {
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case 1:
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if(include_carrier_number)
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-REQ, Carrier: %d",
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carriernumber);
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-REQ");
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break;
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case 2:
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if(include_carrier_number)
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-IND, Carrier: %d",
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carriernumber);
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-IND");
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break;
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case 3:
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if(include_carrier_number)
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col_add_fstr(pinfo->cinfo, COL_INFO, "MAC-Timer, Carrier: %d",
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carriernumber);
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "MAC-Timer");
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break;
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case 127:
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if(include_carrier_number)
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-IND Done, Carrier: %d",
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carriernumber);
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-IND Done");
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break;
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case 128:
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if(include_carrier_number)
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-REQ Done, Carrier: %d",
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carriernumber);
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else
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col_add_fstr(pinfo->cinfo, COL_INFO, "Tetra-UNITDATA-REQ Done");
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break;
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default:
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col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown command: %d", type);
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break;
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}
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|
|
|
/* if (tree) */ { /* we are being asked for details */
|
|
guint32 offset = 0;
|
|
guint32 txtimer = 0;
|
|
guint32 tslot = 0;
|
|
|
|
tetra_item = proto_tree_add_item(tree, proto_tetra, tvb, 0, -1, ENC_NA);
|
|
tetra_tree = proto_item_add_subtree(tetra_item, ett_tetra);
|
|
|
|
offset ++;
|
|
|
|
/* Carrier number */
|
|
if(include_carrier_number) {
|
|
proto_tree_add_uint(tetra_tree, hf_tetra_carriernumber, tvb, offset, 1, carriernumber);
|
|
offset ++;
|
|
}
|
|
|
|
/* Registers */
|
|
tetra_sub_item = proto_tree_add_item( tetra_tree, hf_tetra_header, tvb, offset, -1, ENC_NA );
|
|
tetra_header_tree = proto_item_add_subtree(tetra_sub_item, ett_tetra);
|
|
|
|
/* Timer */
|
|
txtimer = tvb_get_letohl(tvb, offset);
|
|
tetra_sub_item = proto_tree_add_item(tetra_header_tree, hf_tetra_timer, tvb, offset, 4, ENC_LITTLE_ENDIAN);
|
|
tslot = ((txtimer & 0x7800) >> 11);
|
|
if(tslot==4)
|
|
tslot = 3;
|
|
if(tslot==8)
|
|
tslot = 4;
|
|
proto_item_append_text(tetra_sub_item, " (Multiple frame: %d, Frame: %d, Slot: %d)",
|
|
txtimer & 0x3F, (txtimer & 0x7c0) >> 6,
|
|
tslot);
|
|
|
|
offset += 4;
|
|
|
|
switch(type) {
|
|
case 1: /* tetra-UNITDATA-REQ */
|
|
case 128: /* tetra-UNITDATA-REQ Done */
|
|
dissect_tetra_UNITDATA_REQ(tvb, pinfo, tetra_header_tree, offset);
|
|
break;
|
|
case 2: /* tetra-UNITDATA-IND */
|
|
case 127: /* tetra-UNITDATA-IND Done */
|
|
dissect_tetra_UNITDATA_IND(tvb, pinfo, tetra_header_tree, offset);
|
|
break;
|
|
case 3: /* MAC-Timer */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
void proto_reg_handoff_tetra(void)
|
|
{
|
|
tetra_handle = create_dissector_handle(dissect_tetra, proto_tetra);
|
|
dissector_add_uint_with_preference("udp.port", TETRA_UDP_PORT, tetra_handle);
|
|
}
|
|
|
|
|
|
void proto_register_tetra (void)
|
|
{
|
|
module_t *tetra_module;
|
|
expert_module_t* expert_tetra;
|
|
|
|
/*
|
|
* A header field is something you can search/filter on.
|
|
*
|
|
* We create a structure to register our fields. It consists of an
|
|
* array of hf_register_info structures, each of which are of the format
|
|
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
|
|
*/
|
|
static hf_register_info hf[] = {
|
|
{ &hf_tetra,
|
|
{ "Data", "tetra.data", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"tetra PDU", HFILL }},
|
|
{ &hf_tetra_header,
|
|
{ "Registers", "tetra.header", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"TETRA Registers", HFILL }},
|
|
{ &hf_tetra_channels,
|
|
{ "Logical Channels", "tetra.channels", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The amount of logical channels", HFILL }},
|
|
{ &hf_tetra_channel1,
|
|
{ "Channel 1", "tetra.txchannel1", FT_UINT8, BASE_DEC, VALS(channeltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_channel2,
|
|
{ "Channel 2", "tetra.txchannel2", FT_UINT8, BASE_DEC, VALS(channeltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_channel3,
|
|
{ "Channel 3", "tetra.txchannel3", FT_UINT8, BASE_DEC, VALS(channeltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_txreg,
|
|
{ "TxR", "tetra.txreg", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"TX Register", HFILL }},
|
|
{ &hf_tetra_rvstr,
|
|
{ "RvSteR", "tetra.rvster", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Receive Status Register", HFILL }},
|
|
{ &hf_tetra_carriernumber,
|
|
{ "Carrier Number", "tetra.carrier", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_tetra_rxchannel1,
|
|
{ "Channel 1", "tetra.rxchannel1", FT_UINT8, BASE_DEC, VALS(recvchanneltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_rxchannel2,
|
|
{ "Channel 2", "tetra.rxchannel2", FT_UINT8, BASE_DEC, VALS(recvchanneltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_rxchannel3,
|
|
{ "Channel 3", "tetra.rxchannel3", FT_UINT8, BASE_DEC, VALS(recvchanneltypenames), 0x0,
|
|
"Logical channels type", HFILL }},
|
|
{ &hf_tetra_timer,
|
|
{ "Timer", "tetra.timer", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"Timer Register", HFILL }},
|
|
{ &hf_tetra_crc,
|
|
{ "CRC", "tetra.crc", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"CRC result", HFILL }},
|
|
{ &hf_tetra_len0,
|
|
{ "Length", "tetra.len0", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Length of the PDU", HFILL }},
|
|
{ &hf_tetra_pdu,
|
|
{ "PDU", "tetra.pdu", FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }} ,
|
|
|
|
#include "packet-tetra-hfarr.c"
|
|
};
|
|
|
|
/* List of subtrees */
|
|
static gint *ett[] = {
|
|
&ett_tetra,
|
|
&ett_tetra_header,
|
|
&ett_tetra_length,
|
|
&ett_tetra_txreg,
|
|
&ett_tetra_text,
|
|
#include "packet-tetra-ettarr.c"
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_tetra_channels_incorrect, { "tetra.channels.incorrect", PI_MALFORMED, PI_WARN, "Channel count incorrect, must be <= 3", EXPFILL }},
|
|
};
|
|
|
|
proto_tetra = proto_register_protocol("TETRA Protocol", "TETRA", "tetra");
|
|
proto_register_field_array (proto_tetra, hf, array_length (hf));
|
|
proto_register_subtree_array (ett, array_length (ett));
|
|
register_dissector("tetra", dissect_tetra, proto_tetra);
|
|
expert_tetra = expert_register_protocol(proto_tetra);
|
|
expert_register_field_array(expert_tetra, ei, array_length(ei));
|
|
|
|
tetra_module = prefs_register_protocol(proto_tetra, NULL);
|
|
prefs_register_bool_preference(tetra_module, "include_carrier_number",
|
|
"The data include carrier numbers",
|
|
"Whether the captured data include carrier number",
|
|
&include_carrier_number);
|
|
}
|