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/* packet-teimanagement.c
* Routines for LAPD TEI Management frame disassembly
* Rolf Fiedler <rolf.fiedler@innoventif.com>
* based on code by Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/lapd_sapi.h>
/* ISDN/LAPD references:
*
* http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm
* http://www.ece.wpi.edu/courses/ee535/hwk11cd95/agrebe/agrebe.html
* http://www.acacia-net.com/Clarinet/Protocol/q9213o84.htm
*/
void proto_reg_handoff_teimanagement(void);
void proto_register_teimanagement(void);
static dissector_handle_t teimanagement_handle;
static int proto_tei;
static int hf_tei_management_entity_id;
static int hf_tei_management_reference;
static int hf_tei_management_message;
static int hf_tei_management_action;
static int hf_tei_management_extend;
static int ett_tei_management_subtree;
#define TEI_ID_REQUEST 0x01
#define TEI_ID_ASSIGNED 0x02
#define TEI_ID_DENIED 0x03
#define TEI_ID_CHECK_REQ 0x04
#define TEI_ID_CHECK_RESP 0x05
#define TEI_ID_REMOVE 0x06
#define TEI_ID_VERIFY 0x07
static const value_string tei_msg_vals[]={
{ TEI_ID_REQUEST, "Identity Request"},
{ TEI_ID_ASSIGNED, "Identity Assigned"},
{ TEI_ID_DENIED, "Identity Denied"},
{ TEI_ID_CHECK_REQ, "Identity Check Request"},
{ TEI_ID_CHECK_RESP, "Identity Check Response"},
{ TEI_ID_REMOVE, "Identity Remove"},
{ TEI_ID_VERIFY, "Identity Verify"},
{ 0, NULL}
};
static int
dissect_teimanagement(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *tei_tree = NULL;
proto_item *tei_ti;
uint8_t message;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TEI");
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
tei_ti = proto_tree_add_item(tree, proto_tei, tvb, 0, 5, ENC_NA);
tei_tree = proto_item_add_subtree(tei_ti, ett_tei_management_subtree);
proto_tree_add_item(tei_tree, hf_tei_management_entity_id, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tei_tree, hf_tei_management_reference, tvb, 1, 2, ENC_BIG_ENDIAN);
}
message = tvb_get_uint8(tvb, 3);
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(message, tei_msg_vals, "Unknown message type (0x%04x)"));
if (tree) {
proto_tree_add_uint(tei_tree, hf_tei_management_message, tvb, 3, 1, message);
proto_tree_add_item(tei_tree, hf_tei_management_action, tvb, 4, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tei_tree, hf_tei_management_extend, tvb, 4, 1, ENC_BIG_ENDIAN);
}
return tvb_captured_length(tvb);
}
void
proto_register_teimanagement(void)
{
static int *subtree[]={
&ett_tei_management_subtree
};
static hf_register_info hf[] = {
{ &hf_tei_management_entity_id,
{ "Entity", "tei_management.entity", FT_UINT8, BASE_HEX, NULL, 0x0,
"Layer Management Entity Identifier", HFILL }},
{ &hf_tei_management_reference,
{ "Reference", "tei_management.reference", FT_UINT16, BASE_DEC, NULL, 0x0,
"Reference Number", HFILL }},
{ &hf_tei_management_message,
{ "Msg", "tei_management.msg", FT_UINT8, BASE_DEC, VALS(tei_msg_vals), 0x0,
"Message Type", HFILL }},
{ &hf_tei_management_action,
{ "Action", "tei_management.action", FT_UINT8, BASE_DEC, NULL, 0xfe,
"Action Indicator", HFILL }},
{ &hf_tei_management_extend,
{ "Extend", "tei_management.extend", FT_UINT8, BASE_DEC, NULL, 0x01,
"Extension Indicator", HFILL }}
};
proto_tei = proto_register_protocol("TEI Management Procedure, Channel D (LAPD)",
"TEI_MANAGEMENT", "tei_management");
proto_register_field_array (proto_tei, hf, array_length(hf));
proto_register_subtree_array(subtree, array_length(subtree));
teimanagement_handle = register_dissector("tei_management", dissect_teimanagement, proto_tei);
}
void
proto_reg_handoff_teimanagement(void)
{
dissector_add_uint("lapd.sapi", LAPD_SAPI_L2, teimanagement_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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