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/* packet-gmr1_dtap.c
*
* Routines for GMR-1 DTAP dissection in wireshark.
* Copyright (c) 2011 Sylvain Munaut <tnt@246tNt.com>
*
* References:
* [1] ETSI TS 101 376-4-8 V1.3.1 - GMR-1 04.008
* [2] ETSI TS 101 376-4-8 V2.2.1 - GMPRS-1 04.008
* [3] ETSI TS 101 376-4-8 V3.1.1 - GMR-1 3G 44.008
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-gmr1_common.h"
void proto_register_gmr1_dtap(void);
void proto_reg_handoff_gmr1_dtap(void);
/* GMR-1 DTAP proto */
static int proto_gmr1_dtap;
static int hf_gmr1_dtap_protocol_discriminator;
static int hf_gmr1_dtap_message_elements;
/* GMR-1 DTAP sub tree */
static int ett_gmr1_dtap;
static int ett_gmr1_pd;
/* Handoffs */
static dissector_handle_t gsm_dtap_handle;
static dissector_handle_t dtap_handle;
static int
dissect_gmr1_dtap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
uint32_t len, offset;
gmr1_msg_func_t msg_func;
const char *msg_str;
int ett_tree;
int hf_idx;
proto_item *dtap_item = NULL/*, *pd_item = NULL*/;
proto_tree *dtap_tree = NULL/*, *pd_tree = NULL*/;
uint32_t oct[2];
uint8_t pd;
/* Scan init */
len = tvb_captured_length(tvb);
offset = 0;
/* Protocol descriptor */
oct[0] = tvb_get_uint8(tvb, offset++);
if ((oct[0] & GMR1_PD_EXT_MSK) == GMR1_PD_EXT_VAL)
pd = oct[0] & 0xff;
else
pd = oct[0] & 0x0f;
/* HACK: Quick delegation hack to GSM */
if (pd != GMR1_PD_RR) {
call_dissector(gsm_dtap_handle, tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
/* Fill up some info */
col_append_str(pinfo->cinfo, COL_INFO, " (DTAP) ");
col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ",
val_to_str(pd, gmr1_pd_short_vals, "Unknown (%u)"));
/* Get message parameters */
oct[1] = tvb_get_uint8(tvb, offset);
gmr1_get_msg_params((gmr1_pd_e)pd, oct[1], &msg_str, &ett_tree, &hf_idx, &msg_func);
/* Create protocol tree */
if (msg_str == NULL)
{
dtap_item = proto_tree_add_protocol_format(
tree, proto_gmr1_dtap, tvb, 0, len,
"GMR-1 DTAP - Message Type (0x%02x)", oct[1]);
dtap_tree = proto_item_add_subtree(dtap_item, ett_gmr1_dtap);
col_append_fstr(pinfo->cinfo, COL_INFO, "Message Type (0x%02x) ", oct[1]);
}
else
{
dtap_item = proto_tree_add_protocol_format(
tree, proto_gmr1_dtap, tvb, 0, -1,
"GMR-1 DTAP - %s", msg_str);
dtap_tree = proto_item_add_subtree(dtap_item, ett_gmr1_dtap);
col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", msg_str);
}
/* Start over */
offset = 0;
/* Protocol discriminator item */
/*pd_item =*/ proto_tree_add_uint(
dtap_tree, hf_gmr1_dtap_protocol_discriminator, tvb, 1, 1, pd);
/*pd_tree = proto_item_add_subtree(pd_item, ett_gmr1_pd);*/
/* Move on */
offset++;
/* Message type - [1] 11.4 */
proto_tree_add_uint_format(
dtap_tree, hf_idx, tvb, offset, 1, oct[1],
"Message Type: %s", msg_str ? msg_str : "(Unknown)"
);
offset++;
/* Decode elements */
if (msg_func) {
(*msg_func)(tvb, dtap_tree, pinfo, offset, len - offset);
} else {
proto_tree_add_item(dtap_tree, hf_gmr1_dtap_message_elements, tvb, offset, len - offset, ENC_NA);
}
/* Done ! */
return tvb_captured_length(tvb);
}
void
proto_register_gmr1_dtap(void)
{
static hf_register_info hf[] = {
{ &hf_gmr1_dtap_protocol_discriminator,
{ "Protocol Discriminator", "gmr1.dtap.protocol_discriminator",
FT_UINT8, BASE_DEC, VALS(gmr1_pd_vals), 0x0,
NULL, HFILL }
},
{ &hf_gmr1_dtap_message_elements,
{ "Message elements", "gmr1.dtap.message_elements",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static int *ett[] = {
&ett_gmr1_dtap,
&ett_gmr1_pd,
};
/* Setup protocol subtree array */
proto_register_subtree_array(ett, array_length(ett));
/* Register the protocol name and field description */
proto_gmr1_dtap = proto_register_protocol("GEO-Mobile Radio (1) DTAP", "GMR-1 DTAP", "gmr1.dtap");
proto_register_field_array(proto_gmr1_dtap, hf, array_length(hf));
/* Register dissector */
dtap_handle = register_dissector("gmr1_dtap", dissect_gmr1_dtap, proto_gmr1_dtap);
}
void
proto_reg_handoff_gmr1_dtap(void)
{
dissector_add_uint("lapsat.sapi", 0 , dtap_handle); /* LAPSat: CC/RR/MM */
dissector_add_uint("lapsat.sapi", 3 , dtap_handle); /* LAPSat: SMS/SS */
gsm_dtap_handle = find_dissector_add_dependency("gsm_a_dtap", proto_gmr1_dtap);
}
/*
* Editor modelines - https://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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