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wireshark/epan/dissectors/packet-gsm_r_uus1.c

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/* packet-gsm_r_uus1.c
* Routines for GSM-R UUS1 dissection
*
* Copyright 2018, Michail Koreshkov <michail.koreshkov [at] bk.ru
*
* Reference [1]
* Railways Telecommunications (RT);
* Global System for Mobile communications (GSM);
* Usage of the User-to-User Information Element
* for GSM Operation on Railways
* (ETSI TS 102 610 V1.2.0 (2012-08))
*
* Reference [2]
* EIRENE SRS: "UIC Project EIRENE System Requirements Specification".
*
* Reference [3]
* MORANE F 10 T 6003 4: "FFFS for Presentation of Functional Numbers
* to Called and Calling Parties".
*
* Reference [4]
* eLDA IRS (V5.0): "Interface Requirements Specification
* enhanced Location Dependent Addressing".
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/tap.h>
#include <epan/prefs.h>
#include <epan/strutil.h>
/* forward reference */
void proto_register_gsm_r_uus1(void);
void proto_reg_handoff_gsm_r_uus1(void);
/* Initialize the protocol and registered fields */
static int proto_gsm_r_uus1 = -1;
static int hf_gsm_r_uus1_elem_tag = -1;
static int hf_gsm_r_uus1_elem_len = -1;
static int hf_gsm_r_uus1_pfn = -1;
static int hf_gsm_r_uus1_pfn_digits = -1;
/* 5.2 and 5.3 */
static int hf_gsm_r_uus1_chpc = -1;
static int hf_gsm_r_uus1_chpc_t_dur = -1;
static int hf_gsm_r_uus1_chpc_t_rel = -1;
static int hf_gsm_r_uus1_chpc_pl_call = -1;
static int hf_gsm_r_uus1_chpc_cause = -1;
static int hf_gsm_r_uus1_chpc_cause_power = -1;
static int hf_gsm_r_uus1_chpc_cause_radio = -1;
static int hf_gsm_r_uus1_chpc_cause_reserved3 = -1;
static int hf_gsm_r_uus1_chpc_cause_reserved4 = -1;
static int hf_gsm_r_uus1_chpc_cause_user_command = -1;
static int hf_gsm_r_uus1_chpc_cause_reserved6 = -1;
static int hf_gsm_r_uus1_chpc_cause_reserved7 = -1;
static int hf_gsm_r_uus1_chpc_cause_reserved8 = -1;
static int hf_gsm_r_uus1_chpc_gref = -1;
static int hf_gsm_r_uus1_chpc_ack_cause = -1;
/* 5.4 */
static int hf_gsm_r_uus1_epfn = -1;
/* 5.5 */
static int hf_gsm_r_uus1_present_text_str = -1;
/* 5.6 */
static int hf_gsm_r_uus1_elda = -1;
static int hf_gsm_r_uus1_elda_lat = -1;
static int hf_gsm_r_uus1_elda_lat_deg = -1;
static int hf_gsm_r_uus1_elda_lat_min = -1;
static int hf_gsm_r_uus1_elda_lat_sec = -1;
static int hf_gsm_r_uus1_elda_lat_hem = -1;
static int hf_gsm_r_uus1_elda_long = -1;
static int hf_gsm_r_uus1_elda_long_deg = -1;
static int hf_gsm_r_uus1_elda_long_min = -1;
static int hf_gsm_r_uus1_elda_long_sec = -1;
static int hf_gsm_r_uus1_elda_long_hem = -1;
static int hf_gsm_r_uus1_elda_height = -1;
static int hf_gsm_r_uus1_elda_speed = -1;
static int hf_gsm_r_uus1_elda_heading = -1;
static int hf_gsm_r_uus1_elda_e_time = -1;
static int hf_gsm_r_uus1_elda_distance = -1;
static int hf_gsm_r_uus1_elda_scale = -1;
static int hf_gsm_r_uus1_elda_spare = -1;
/* 5.7 */
static int hf_gsm_r_uus1_present_dsd_alarm = -1;
static int hf_gsm_r_uus1_present_dsd_alarm_loco_number = -1;
/* 5.8 */
static int hf_gsm_r_uus1_alert_controller = -1;
static int hf_gsm_r_uus1_alert_controller_gref = -1;
/* Initialize the subtree pointers */
static gint ett_gsm_r_uus1 = -1;
static gint ett_gsm_r_uus1_pfn = -1;
static gint ett_gsm_r_uus1_chpc = -1;
static gint ett_gsm_r_uus1_chpc_cause = -1;
static gint ett_gsm_r_uus1_epfn = -1;
static gint ett_gsm_r_uus1_present_text_str = -1;
static gint ett_gsm_r_uus1_elda = -1;
static gint ett_gsm_r_uus1_elda_lat = -1;
static gint ett_gsm_r_uus1_elda_long = -1;
static gint ett_gsm_r_uus1_present_dsd_alarm = -1;
static gint ett_gsm_r_uus1_alert_controller = -1;
/* Preferences */
static gboolean q931_u2u = FALSE;
static gboolean gsm_a_u2u = TRUE;
static expert_field ei_gsm_r_uus1_not_implemented_yet = EI_INIT;
static const value_string gsm_r_uus1_tags[] = {
{ 2, "Acknowledgement by Receiver of a HPC and response from device accepting the acknowledgement" },
{ 3, "Acknowledgement by Initiator of a HPC" },
{ 5, "Presentation of Functional Number" },
{ 6, "enhanced Location Dependent Addressing" },
{ 7, "enhanced Location Dependent Addressing (Reserved for future use)" },
{ 8, "enhanced Location Dependent Addressing (Reserved for future use)" },
{ 9, "ePFN Information" },
{ 10, "User specific plain text according to alphabet indicator" },
{ 11, "DSD Alarm Notification" },
{ 12, "Alerting of a Controller Notification and Response" },
{ 0, NULL }
};
/*
* 5.1 Presentation of functional number
*
*/
static guint16
de_gsm_r_uus1_pfn(tvbuff_t *tvb, proto_tree *tree, guint32 offset)
{
guint32 curr_offset;
guint32 len;
const gchar *fn_str;
proto_item *item;
proto_tree *sub_tree;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_pfn, tvb, curr_offset, len+2, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_pfn);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
if(len == 0) {
proto_item_append_text(item, ": No FN Available");
}else {
fn_str = tvb_bcd_dig_to_str(wmem_packet_scope(), tvb, offset+2, len, NULL, FALSE);
proto_tree_add_string(sub_tree, hf_gsm_r_uus1_pfn_digits, tvb, curr_offset, len, fn_str);
proto_item_append_text(item, ": %s", fn_str);
curr_offset += len;
}
return (curr_offset - offset);
}
/*
* 5.2 Confirmation of High Priority Calls
*
*/
static const range_string gsm_r_uus1_chpc_priority_vals[] = {
{ 0x00, 0x00, "no priority specified in call"},
{ 0x01, 0x01, "eMLPP priority of 4 (Railway Information)"},
{ 0x02, 0x02, "eMLPP priority of 3 (Railway Operation)"},
{ 0x03, 0x03, "eMLPP priority of 2 (Public Emergency/Group Calls)"},
{ 0x04, 0x04, "eMLPP priority of 1 (Command and Control)"},
{ 0x05, 0x05, "eMLPP priority of 0 (Railway Emergency)"},
{ 0x06, 0x07, "unknown" },
{ 0, 0, NULL }
};
static guint16
de_gsm_r_uus1_chpc_forward(tvbuff_t *tvb, proto_tree *tree, guint32 offset)
{
guint32 curr_offset;
guint32 len;
guint32 t_dur;
guint32 t_rel;
proto_item *item;
proto_tree *sub_tree;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_chpc, tvb, curr_offset, len+2, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_chpc);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
t_dur = tvb_get_guint24(tvb, curr_offset, ENC_LITTLE_ENDIAN);
proto_tree_add_uint_format_value(sub_tree, hf_gsm_r_uus1_chpc_t_dur, tvb, curr_offset, 3, t_dur, "%d ms", t_dur*100);
curr_offset += 3;
t_rel = tvb_get_guint32(tvb, curr_offset, ENC_LITTLE_ENDIAN);
proto_tree_add_uint_format_value(sub_tree, hf_gsm_r_uus1_chpc_t_rel, tvb, curr_offset, 4, t_rel, "%d ms", t_rel*100);
curr_offset += 4;
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_chpc_pl_call, tvb, curr_offset, 1, ENC_NA);
curr_offset += 1;
static int * const cause_flags[] = {
&hf_gsm_r_uus1_chpc_cause_power,
&hf_gsm_r_uus1_chpc_cause_radio,
&hf_gsm_r_uus1_chpc_cause_reserved3,
&hf_gsm_r_uus1_chpc_cause_reserved4,
&hf_gsm_r_uus1_chpc_cause_user_command,
&hf_gsm_r_uus1_chpc_cause_reserved6,
&hf_gsm_r_uus1_chpc_cause_reserved7,
&hf_gsm_r_uus1_chpc_cause_reserved8,
NULL
};
proto_tree_add_bitmask(sub_tree, tvb, curr_offset, hf_gsm_r_uus1_chpc_cause, ett_gsm_r_uus1_chpc_cause, cause_flags, ENC_NA);
curr_offset += 1;
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_chpc_gref, tvb, curr_offset, 4, ENC_BCD_DIGITS_0_9);
curr_offset += 4;
return (curr_offset - offset);
}
/*
* 5.3 CHPC tag definition for collecting network device
*
* The tag is included in a RELEASE_COMPLETE message
* which shall have the release cause value of "Normal Call Clearing".
*
* gsm_a.dtap.msg_cc_type == 0x2a
*/
static const range_string gsm_r_uus1_chpc_ack_cause_vals[] = {
{ 0x00, 0x00, "ACK (no error)" },
{ 0x01, 0x01, "NACK-1 (error, repetition should take place)" },
{ 0x02, 0x7f, "Reserved for internal use" },
{ 0x80, 0x80, "NACK-2 (fatal error, NO repetition to take place)" },
{ 0x81, 0xff, "Reserved" },
{ 0, 0, NULL }
};
static guint16
de_gsm_r_uus1_chpc_collect(tvbuff_t *tvb, proto_tree *tree, guint32 offset)
{
proto_item *item;
proto_tree *sub_tree;
item = proto_tree_add_item(tree, hf_gsm_r_uus1_chpc, tvb, offset, 2, ENC_NA);
proto_item_set_text(item, "CHPC for collecting network device");
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_chpc);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_chpc_ack_cause, tvb, offset+1, 1, ENC_NA);
return 2;
}
/*
* Type of field depends on BSSAP message type. SETUP or RELEASE_COMPLETE
* But I don't know how to verify message type.
* That is why use length variable to find type of field
*/
static guint16
de_gsm_r_uus1_chpc(tvbuff_t *tvb, proto_tree *tree, guint32 offset)
{
guint8 field_length;
field_length = tvb_get_guint8(tvb, offset+1);
if(field_length == 13)
return de_gsm_r_uus1_chpc_forward(tvb, tree, offset);
else
return de_gsm_r_uus1_chpc_collect(tvb, tree, offset);
}
/*
* 5.4 Enhanced presentation of functional number
* (not implemented now)
*/
static guint16
de_gsm_r_uus1_epfn(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset)
{
guint32 curr_offset;
guint32 len;
proto_item *item;
proto_tree *sub_tree;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_epfn, tvb, curr_offset, len+2, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_epfn);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
proto_tree_add_expert(sub_tree, pinfo, &ei_gsm_r_uus1_not_implemented_yet, tvb, curr_offset, len);
curr_offset += len;
return (curr_offset - offset);
}
/*
* 5.5 Presentation of text strings
* (not implemented now)
*/
static guint16
de_gsm_r_uus1_text_str(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset)
{
guint32 curr_offset;
guint32 len;
proto_item *item;
proto_tree *sub_tree;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_present_text_str, tvb, curr_offset, len+2, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_present_text_str);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
proto_tree_add_expert(sub_tree, pinfo, &ei_gsm_r_uus1_not_implemented_yet, tvb, curr_offset, len);
curr_offset += len;
return (curr_offset - offset);
}
/*
* 5.6 Transfer of train position (eLDA)
*
*/
static const true_false_string gsm_r_uus1_elda_lat_hem = {
"North",
"South"
};
static const true_false_string gsm_r_uus1_elda_long_hem = {
"West",
"East"
};
static const value_string gsm_r_uus1_elda_scale_vals[] = {
{ 0, "10 cm resolution" },
{ 1, "1 metre resolution" },
{ 2, "10 metre resolution" },
{ 3, "Odometry information not valid" },
{ 0, NULL }
};
static guint16
de_gsm_r_uus1_elda(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset)
{
guint32 curr_offset;
guint bit_offset;
guint32 val;
guint32 lat_deg_val;
guint32 lat_min_val;
guint32 lat_sec_val;
guint32 lat_hem_val;
guint32 long_deg_val;
guint32 long_min_val;
guint32 long_sec_val;
guint32 long_hem_val;
guint32 t_val;
proto_item *item;
proto_tree *sub_tree;
proto_item *lat_item;
proto_item *long_item;
proto_tree *lat_tree;
proto_tree *long_tree;
curr_offset = offset;
item = proto_tree_add_item(tree, hf_gsm_r_uus1_elda, tvb, curr_offset, 16, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_elda);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
bit_offset = curr_offset * 8;
/* Latitude */
lat_item = proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elda_lat, tvb, curr_offset, 4, ENC_NA);
lat_tree = proto_item_add_subtree(lat_item, ett_gsm_r_uus1_elda_lat);
val = tvb_get_guint32(tvb, curr_offset, ENC_NA);
lat_deg_val = tvb_get_bits(tvb, bit_offset, 7, ENC_NA);
bit_offset += 7;
lat_min_val = tvb_get_bits(tvb, bit_offset, 6, ENC_NA);
bit_offset += 6;
lat_sec_val = tvb_get_bits(tvb, bit_offset, 13, ENC_NA);
bit_offset += 13;
lat_hem_val = tvb_get_bits(tvb, bit_offset, 1, ENC_NA);
bit_offset += 1;
proto_tree_add_uint(lat_tree, hf_gsm_r_uus1_elda_lat_deg, tvb, curr_offset, 4, val);
proto_tree_add_uint(lat_tree, hf_gsm_r_uus1_elda_lat_min, tvb, curr_offset, 4, val);
proto_tree_add_uint_format_value(lat_tree, hf_gsm_r_uus1_elda_lat_sec, tvb, curr_offset, 4, val, "%.2f", (float)(lat_sec_val)/100);
proto_tree_add_boolean(lat_tree, hf_gsm_r_uus1_elda_lat_hem, tvb, curr_offset, 4, val);
proto_item_set_text(lat_item, "Latitude: %d %d\'%.2f\"%s", lat_deg_val, lat_min_val, (float)(lat_sec_val)/100,
lat_hem_val ? "N" : "S");
curr_offset += 3;
/* Longitude */
long_item = proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elda_long, tvb, curr_offset, 4, ENC_NA);
long_tree = proto_item_add_subtree(long_item, ett_gsm_r_uus1_elda_long);
val = tvb_get_guint32(tvb, curr_offset, ENC_NA);
long_deg_val = tvb_get_bits(tvb, bit_offset, 8, ENC_NA);
bit_offset += 8;
long_min_val = tvb_get_bits(tvb, bit_offset, 6, ENC_NA);
bit_offset += 6;
long_sec_val = tvb_get_bits(tvb, bit_offset, 13, ENC_NA);
bit_offset += 13;
long_hem_val = tvb_get_bits(tvb, bit_offset, 1, ENC_NA);
bit_offset += 1;
proto_tree_add_uint(long_tree, hf_gsm_r_uus1_elda_long_deg, tvb, curr_offset, 4, val);
proto_tree_add_uint(long_tree, hf_gsm_r_uus1_elda_long_min, tvb, curr_offset, 4, val);
proto_tree_add_uint_format_value(long_tree, hf_gsm_r_uus1_elda_long_sec, tvb, curr_offset, 4, val, "%.2f", (float)(long_sec_val)/100);
proto_tree_add_boolean(long_tree, hf_gsm_r_uus1_elda_long_hem, tvb, curr_offset, 4, val);
proto_item_set_text(long_item, "Longitude: %d %d\'%.2f\"%s", long_deg_val, long_min_val, (float)(long_sec_val)/100,
long_hem_val ? "W" : "E");
curr_offset += 3;
/* Height, Speed, Heading */
// height step 1m. Range: -100m...+4500m
t_val = tvb_get_bits(tvb, bit_offset, 13, ENC_NA) - 100;
proto_tree_add_int(sub_tree, hf_gsm_r_uus1_elda_height, tvb, curr_offset, 4, t_val);
bit_offset += 13;
// speed step 10 km/h
t_val = tvb_get_bits(tvb, bit_offset, 6, ENC_NA) * 10;
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_speed, tvb, curr_offset, 4, t_val);
bit_offset += 6;
// heading step 10 deg
t_val = tvb_get_bits(tvb, bit_offset, 6, ENC_NA) * 10;
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_heading, tvb, curr_offset, 4, t_val);
bit_offset += 6;
curr_offset += 4;
/* Elapsed Time, Distance, Scale, Spare */
// time step 1 second. Range: 0...2047
t_val = tvb_get_bits(tvb, bit_offset, 11, ENC_NA);
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_e_time, tvb, curr_offset, 4, t_val);
bit_offset += 11;
// distance step = 10 cm, 1 m or 10 m depending on the parameter Scale
t_val = tvb_get_bits(tvb, bit_offset, 14, ENC_NA);
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_distance, tvb, curr_offset, 4, t_val);
bit_offset += 14;
// scale
t_val = tvb_get_bits(tvb, bit_offset, 2, ENC_NA);
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_scale, tvb, curr_offset, 4, t_val);
bit_offset += 2;
// spare
t_val = tvb_get_bits(tvb, bit_offset, 5, ENC_NA);
proto_tree_add_uint(sub_tree, hf_gsm_r_uus1_elda_spare, tvb, curr_offset, 4, t_val);
return 16;
}
/*
* 5.7 Notification DSD alarm condition
*
*/
static guint16
de_gsm_r_uus1_dsd_alarm(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset)
{
guint32 curr_offset;
guint32 len;
const gchar *loco_engine_number;
proto_item *item;
proto_tree *sub_tree;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_present_dsd_alarm, tvb, curr_offset, len+2, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_present_dsd_alarm);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
loco_engine_number = tvb_bcd_dig_to_str(pinfo->pool, tvb, offset+2, len, NULL, FALSE);
proto_tree_add_string(sub_tree, hf_gsm_r_uus1_present_dsd_alarm_loco_number, tvb, curr_offset, len, loco_engine_number);
proto_item_append_text(item, ": %s", loco_engine_number);
curr_offset += len;
return (curr_offset - offset);
}
/*
* 5.8 Notification of a request to alert a controller
*
*/
static guint16
de_gsm_r_uus1_alert_controller(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset)
{
guint32 curr_offset;
guint32 len;
proto_item *item;
proto_tree *sub_tree;
char *gref_str;
curr_offset = offset;
len = tvb_get_guint8(tvb, offset+1);
item = proto_tree_add_item(tree, hf_gsm_r_uus1_alert_controller, tvb, curr_offset+2, len, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_gsm_r_uus1_alert_controller);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_tag, tvb, curr_offset, 1, ENC_NA);
proto_tree_add_item(sub_tree, hf_gsm_r_uus1_elem_len, tvb, curr_offset+1, 1, ENC_NA);
curr_offset += 2;
proto_tree_add_item_ret_display_string(sub_tree, hf_gsm_r_uus1_alert_controller_gref, tvb, curr_offset, 4, ENC_BCD_DIGITS_0_9, pinfo->pool, &gref_str);
proto_item_append_text(item, ": %s", gref_str);
curr_offset += 4;
return (curr_offset - offset);
}
static int
dissect_gsm_r_uus1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint8 elem_tag;
guint32 offset;
guint32 len;
proto_item *gsm_r_uus1_item = NULL;
proto_tree *gsm_r_uus1_tree = NULL;
offset = 0;
len = tvb_captured_length(tvb);
gsm_r_uus1_item =
proto_tree_add_protocol_format(tree, proto_gsm_r_uus1, tvb, 0, len, "GSM-R User-to-User Signaling");
gsm_r_uus1_tree = proto_item_add_subtree(gsm_r_uus1_item, ett_gsm_r_uus1);
while (offset < len){
elem_tag = tvb_get_guint8(tvb, offset);
switch (elem_tag) {
case 2:
case 3:
offset += de_gsm_r_uus1_chpc(tvb, gsm_r_uus1_tree, offset);
break;
case 5:
offset += de_gsm_r_uus1_pfn(tvb, gsm_r_uus1_tree, offset);
break;
case 6:
case 7:
case 8:
offset += de_gsm_r_uus1_elda(tvb, gsm_r_uus1_tree, pinfo, offset);
break;
case 9:
offset += de_gsm_r_uus1_epfn(tvb, gsm_r_uus1_tree, pinfo, offset);
break;
case 10:
offset += de_gsm_r_uus1_text_str(tvb, gsm_r_uus1_tree, pinfo, offset);
break;
case 11:
offset += de_gsm_r_uus1_dsd_alarm(tvb, gsm_r_uus1_tree, pinfo, offset);
break;
case 12:
offset += de_gsm_r_uus1_alert_controller(tvb, gsm_r_uus1_tree, pinfo, offset);
break;
default:
return offset;
}
}
return offset;
}
/* heuristic dissector */
static gboolean
dissect_gsm_r_uus1_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
if (dissect_gsm_r_uus1(tvb, pinfo, tree, NULL) > 0)
return FALSE;
return TRUE;
}
/* Register the protocol with Wireshark */
void
proto_register_gsm_r_uus1(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_gsm_r_uus1_elem_tag,
{ "Element tag", "gsm-r-uus1.elem_tag",
FT_UINT8, BASE_DEC, VALS(gsm_r_uus1_tags), 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elem_len,
{ "Length", "gsm-r-uus1.elem_len",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_pfn,
{ "Presentation of Functional Number (PFN)", "gsm-r-uus1.pfn",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_pfn_digits,
{ "Digits", "gsm-r-uus1.pfn.digits",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc,
{ "Confirmation of High Priority Calls (CHPC)", "gsm-r-uus1.chpc",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_t_dur,
{ "Duration of the call", "gsm-r-uus1.chpc.t_dur",
FT_UINT24, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_t_rel,
{ "Interval between the end of the call and the transmission of the confirmation message", "gsm-r-uus1.chpc.t_rel",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_pl_call,
{ "Priority level of the call", "gsm-r-uus1.chpc.pl_call",
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gsm_r_uus1_chpc_priority_vals), 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause,
{ "Reason for termination of the call", "gsm-r-uus1.chpc.cause",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_power,
{ "Mobile was powered off when receiving (power fail)", "gsm-r-uus1.chpc.cause.power",
FT_BOOLEAN, 8, NULL, 0x01,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_radio,
{ "Call was interrupted due to radio link error", "gsm-r-uus1.chpc.cause.radio",
FT_BOOLEAN, 8, NULL, 0x02,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_reserved3,
{ "Reserved", "gsm-r-uus1.chpc.cause.reserved3",
FT_BOOLEAN, 8, NULL, 0x04,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_reserved4,
{ "Reserved", "gsm-r-uus1.chpc.cause.reserved4",
FT_BOOLEAN, 8, NULL, 0x08,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_user_command,
{ "Call was left on user command", "gsm-r-uus1.chpc.cause.user_command",
FT_BOOLEAN, 8, NULL, 0x10,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_reserved6,
{ "Reserved", "gsm-r-uus1.chpc.cause.reserved6",
FT_BOOLEAN, 8, NULL, 0x20,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_reserved7,
{ "Reserved", "gsm-r-uus1.chpc.cause.reserved7",
FT_BOOLEAN, 8, NULL, 0x40,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_cause_reserved8,
{ "Reserved", "gsm-r-uus1.chpc.cause.reserved8",
FT_BOOLEAN, 8, NULL, 0x80,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_gref,
{ "Group call reference", "gsm-r-uus1.chpc.gref",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_chpc_ack_cause,
{ "ACK/CAUSE", "gsm-r-uus1.chpc.ack_cause",
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gsm_r_uus1_chpc_ack_cause_vals), 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_epfn,
{ "Enhanced presentation of functional number (ePFN)", "gsm-r-uus1.epfn",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_present_text_str,
{ "Presentation of text strings", "gsm-r-uus1.present_text_str",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda,
{ "Train position (eLDA)", "gsm-r-uus1.elda",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_lat,
{ "Latitude", "gsm-r-uus1.elda.lat",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_lat_deg,
{ "Degrees", "gsm-r-uus1.elda.lat.deg",
FT_UINT32, BASE_DEC, NULL, 0xFE000000,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_lat_min,
{ "Minutes", "gsm-r-uus1.elda.lat.min",
FT_UINT32, BASE_DEC, NULL, 0x01F80000,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_lat_sec,
{ "Seconds", "gsm-r-uus1.elda.lat.sec",
FT_UINT32, BASE_DEC, NULL, 0x0007FFC0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_lat_hem,
{ "Hemisphere", "gsm-r-uus1.elda.lat.hem",
FT_BOOLEAN, 32, TFS(&gsm_r_uus1_elda_lat_hem), 0x00000020,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_long,
{ "Latitude", "gsm-r-uus1.elda.long",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_long_deg,
{ "Degrees", "gsm-r-uus1.elda.long.deg",
FT_UINT32, BASE_DEC, NULL, 0x1FE00000,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_long_min,
{ "Minutes", "gsm-r-uus1.elda.long.min",
FT_UINT32, BASE_DEC, NULL, 0x001F8000,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_long_sec,
{ "Seconds", "gsm-r-uus1.elda_long.sec",
FT_UINT32, BASE_DEC, NULL, 0x00007FFC,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_long_hem,
{ "Hemisphere", "gsm-r-uus1.elda_long.hem",
FT_BOOLEAN, 32, TFS(&gsm_r_uus1_elda_long_hem), 0x00000002,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_height,
{ "Height (m)", "gsm-r-uus1.elda.height",
FT_INT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_speed,
{ "Speed (km/h)", "gsm-r-uus1.elda.speed",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_heading,
{ "Heading (deg)", "gsm-r-uus1.elda.heading",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_e_time,
{ "Elapsed Time (sec)", "gsm-r-uus1.elda.e_time",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_distance,
{ "Distance", "gsm-r-uus1.elda.distance",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_scale,
{ "Scale", "gsm-r-uus1.elda.scale",
FT_UINT32, BASE_DEC, VALS(gsm_r_uus1_elda_scale_vals), 0x00,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_elda_spare,
{ "Spare", "gsm-r-uus1.elda.spare",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_present_dsd_alarm,
{ "Notification DSD alarm condition", "gsm-r-uus1.present_dsd_alarm",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_present_dsd_alarm_loco_number,
{ "Locomotive engine number", "gsm-r-uus1.present_dsd_alarm.loco_number",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_alert_controller,
{ "Notification of a request to alert a controller", "gsm-r-uus1.alert_controller",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_gsm_r_uus1_alert_controller_gref,
{ "Group call reference", "gsm-r-uus1.alert_controller.gref",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static ei_register_info ei[] = {
{ &ei_gsm_r_uus1_not_implemented_yet, { "gsm-r-uus1.not_implemented_yet", PI_UNDECODED, PI_NOTE, "Not implemented yet", EXPFILL }},
};
expert_module_t* expert_gsm_r_uus1;
static gint *ett[] = {
&ett_gsm_r_uus1,
&ett_gsm_r_uus1_pfn,
&ett_gsm_r_uus1_chpc,
&ett_gsm_r_uus1_chpc_cause,
&ett_gsm_r_uus1_epfn,
&ett_gsm_r_uus1_present_text_str,
&ett_gsm_r_uus1_elda,
&ett_gsm_r_uus1_elda_lat,
&ett_gsm_r_uus1_elda_long,
&ett_gsm_r_uus1_present_dsd_alarm,
&ett_gsm_r_uus1_alert_controller
};
module_t *gsm_r_uus1_module;
/* Register the protocol name and description */
proto_gsm_r_uus1 =
proto_register_protocol("GSM-R User-to-User Signaling", "GSM-R", "gsm-r-uus1");
proto_register_field_array(proto_gsm_r_uus1, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_gsm_r_uus1 = expert_register_protocol(proto_gsm_r_uus1);
expert_register_field_array(expert_gsm_r_uus1, ei, array_length(ei));
/* subdissector code */
register_dissector("gsm-r-uus1", dissect_gsm_r_uus1, proto_gsm_r_uus1);
gsm_r_uus1_module = prefs_register_protocol(proto_gsm_r_uus1, proto_reg_handoff_gsm_r_uus1);
prefs_register_bool_preference(gsm_r_uus1_module, "dissect_q931_u2u",
"Dissect Q.931 User-To-User information",
"Dissect Q.931 User-To-User information",
&q931_u2u);
prefs_register_bool_preference(gsm_r_uus1_module, "dissect_gsm_a_u2u",
"Dissect GSM-A User-To-User information",
"Dissect GSM-A User-To-User information",
&gsm_a_u2u);
}
void
proto_reg_handoff_gsm_r_uus1(void)
{
dissector_handle_t gsm_r_uus1_handle;
gsm_r_uus1_handle = find_dissector("gsm-r-uus1");
if(q931_u2u){
heur_dissector_add("q931_user", dissect_gsm_r_uus1_heur, "GSM-R over UUS1", "gsm_r_uus1", proto_gsm_r_uus1, HEURISTIC_ENABLE);
} else {
heur_dissector_delete("q931_user", dissect_gsm_r_uus1_heur, proto_gsm_r_uus1);
}
if(gsm_a_u2u){
dissector_add_uint("gsm_a.dtap.u2u_prot_discr", 0, gsm_r_uus1_handle);
} else {
dissector_delete_uint("gsm_a.dtap.u2u_prot_discr", 0, gsm_r_uus1_handle);
}
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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