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/* packet-atn-sl.c
* Routines for ISO/OSI network protocol packet disassembly
*
* 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 <wsutil/array.h>
#include <epan/packet.h>
void proto_register_atn_sl(void);
void proto_reg_handoff_atn_sl(void);
/* protocols and fields */
static int proto_atn_sl;
static int ett_atn_sl;
static int hf_atn_sl_tt;
static int hf_atn_sl_sc;
/* ATN traffic types (ICAO doc 9705 Edition3 SV5 5.6.2.2.6.7.3) */
#define ATN_TT_ATSC_NO_PREFERENCE 0x01
#define ATN_TT_ATSC_CLASS_A 0x10
#define ATN_TT_ATSC_CLASS_B 0x11
#define ATN_TT_ATSC_CLASS_C 0x12
#define ATN_TT_ATSC_CLASS_D 0x13
#define ATN_TT_ATSC_CLASS_E 0x14
#define ATN_TT_ATSC_CLASS_F 0x15
#define ATN_TT_ATSC_CLASS_G 0x16
#define ATN_TT_ATSC_CLASS_H 0x17
#define ATN_TT_AOC_NO_PREFERENCE 0x21
#define ATN_TT_AOC_G 0x22
#define ATN_TT_AOC_V 0x23
#define ATN_TT_AOC_S 0x24
#define ATN_TT_AOC_H 0x25
#define ATN_TT_AOC_M 0x26
#define ATN_TT_AOC_G_V 0x27
#define ATN_TT_AOC_G_V_S 0x28
#define ATN_TT_AOC_G_V_H_S 0x29
#define ATN_TT_ADM_NO_PREFERENCE 0x30
#define ATN_TT_SYS_MGMT_NO_PREFERENCE 0x60
/* ATN security classification (ICAO doc 9705 Edition3 SV5 5.6.2.2.6.8.3) */
#define ATN_SC_UNCLASSIFIED 0x01
#define ATN_SC_RESTRICTED 0x02
#define ATN_SC_CONFIDENTIAL 0x03
#define ATN_SC_SECRET 0x04
#define ATN_SC_TOP_SECRET 0x05
/* ATN security label records */
#define OSI_OPT_SECURITY_ATN_SR 0xc0
#define OSI_OPT_SECURITY_ATN_TT 0x0f
#define OSI_OPT_SECURITY_ATN_SC 0x03
#define OSI_OPT_SECURITY_ATN_SR_LEN 6
#define OSI_OPT_SECURITY_ATN_TT_LEN 1
#define OSI_OPT_SECURITY_ATN_SC_LEN 1
#define OSI_OPT_SECURITY_ATN_SI_MAX_LEN 8
static const unsigned char atn_security_registration_val[] = {
0x06, 0x04, 0x2b, 0x1b, 0x00, 0x00
}; /* =iso(1).org(3).ICAO(27).ATN(0).TrafficType(0)*/
#if 0
static const value_string osi_opt_sec_atn_sr_vals[] = {
{OSI_OPT_SECURITY_ATN_SR, "ATN Security Label"},
{0, NULL}
};
#endif
static const value_string osi_opt_sec_atn_si_vals[] = {
{OSI_OPT_SECURITY_ATN_TT, "Traffic Type and Routing"},
{OSI_OPT_SECURITY_ATN_SC, "Security classification"},
{0, NULL}
};
static const value_string osi_opt_sec_atn_tt_vals[] = {
{ATN_TT_ATSC_NO_PREFERENCE, "ATSC No preference"},
{ATN_TT_ATSC_CLASS_A, "ATSC Class A"},
{ATN_TT_ATSC_CLASS_B, "ATSC Class B"},
{ATN_TT_ATSC_CLASS_C, "ATSC Class C"},
{ATN_TT_ATSC_CLASS_D, "ATSC Class D"},
{ATN_TT_ATSC_CLASS_E, "ATSC Class E"},
{ATN_TT_ATSC_CLASS_F, "ATSC Class F"},
{ATN_TT_ATSC_CLASS_G, "ATSC Class G"},
{ATN_TT_ATSC_CLASS_H, "ATSC Class H"},
{ATN_TT_AOC_NO_PREFERENCE, "AOC No preference"},
{ATN_TT_AOC_G, "AOC Gatelink only"},
{ATN_TT_AOC_V, "AOC VHF only"},
{ATN_TT_AOC_S, "AOC Satellite only"},
{ATN_TT_AOC_H, "AOC HF only"},
{ATN_TT_AOC_M, "AOC Mode S only"},
{ATN_TT_AOC_G_V, "AOC Gatelink first, then VHF"},
{ATN_TT_AOC_G_V_S, "AOC Gatelink first, then VHF, then Satellite"},
{ATN_TT_AOC_G_V_H_S, "AOC Gatelink first, then VHF, then HF, then Satellite"},
{ATN_TT_ADM_NO_PREFERENCE, "ATN Administrative No preference"},
{ATN_TT_SYS_MGMT_NO_PREFERENCE, "ATN Systems Management No preference"},
{0, NULL}
};
static const value_string osi_opt_sec_atn_sc_vals[] = {
{ATN_SC_UNCLASSIFIED, "unclassified"},
{ATN_SC_RESTRICTED, "restricted"},
{ATN_SC_CONFIDENTIAL, "confidential"},
{ATN_SC_SECRET, "secret"},
{ATN_SC_TOP_SECRET, "top secret"},
{0, NULL}
};
/* dissect ATN security label used for policy based interdomain routing.*/
/* For details see ICAO doc 9705 Edition 3 SV5 5.6.2.2.2.2 */
static int
dissect_atn_sl(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree,
void* data _U_)
{
proto_item *ti;
proto_tree *atn_sl_tree;
unsigned offset = 0;
unsigned char len = 0;
uint8_t tag_name = 0;
unsigned security_info_end = 0;
ti = proto_tree_add_item(tree, proto_atn_sl, tvb, offset, -1, ENC_NA);
atn_sl_tree = proto_item_add_subtree(ti, ett_atn_sl);
/* check Security Registration Length */
len = tvb_get_uint8(tvb, offset);
if ( OSI_OPT_SECURITY_ATN_SR_LEN != len )
return tvb_captured_length(tvb);
offset++;
/* check Security Registration ID */
if ( tvb_memeql(tvb, offset, atn_security_registration_val, OSI_OPT_SECURITY_ATN_SR_LEN) )
return tvb_captured_length(tvb);
offset += OSI_OPT_SECURITY_ATN_SR_LEN;
/* Security Information length */
len = tvb_get_uint8(tvb, offset);
if ( OSI_OPT_SECURITY_ATN_SI_MAX_LEN < len )
return tvb_captured_length(tvb);
offset++;
security_info_end = offset + len;
while ( offset < security_info_end ) {
/* check tag name length*/
len = tvb_get_uint8(tvb, offset); /* check tag name length*/
if ( len != 1 )
return tvb_captured_length(tvb);
offset++;
tag_name = tvb_get_uint8(tvb, offset);
offset++;
switch(tag_name) {
case OSI_OPT_SECURITY_ATN_TT:
/* check tag set length*/
len = tvb_get_uint8(tvb, offset);
if ( len != OSI_OPT_SECURITY_ATN_TT_LEN )
return tvb_captured_length(tvb);
offset++;
proto_tree_add_uint_format(atn_sl_tree, hf_atn_sl_tt, tvb, offset, 1,
tvb_get_uint8(tvb, offset), "%s: %s",
val_to_str(OSI_OPT_SECURITY_ATN_TT, osi_opt_sec_atn_si_vals, "Unknown (0x%x)"),
val_to_str(tvb_get_uint8(tvb, offset ), osi_opt_sec_atn_tt_vals, "Unknown (0x%x)"));
offset += len;
break;
case OSI_OPT_SECURITY_ATN_SC:
/* check tag set length*/
len = tvb_get_uint8(tvb, offset);
if ( len != OSI_OPT_SECURITY_ATN_SC_LEN )
return tvb_captured_length(tvb);
offset++;
proto_tree_add_uint_format(atn_sl_tree, hf_atn_sl_sc, tvb, offset, 1,
tvb_get_uint8(tvb, offset), "%s: %s",
val_to_str(OSI_OPT_SECURITY_ATN_SC, osi_opt_sec_atn_si_vals, "Unknown (0x%x)"),
val_to_str(tvb_get_uint8(tvb, offset ), osi_opt_sec_atn_sc_vals, "Unknown (0x%x)"));
offset += len;
break;
default:
return tvb_captured_length(tvb);
}
}
return tvb_captured_length(tvb);
}
void
proto_register_atn_sl(void)
{
static hf_register_info hf[] = {
{ &hf_atn_sl_tt,
{ "ATN traffic type", "atn_sl.tt", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_atn_sl_sc,
{ "ATN security classification", "atn_sl.sc", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_atn_sl,
};
proto_atn_sl = proto_register_protocol("ATN Security Label", "ATN SL", "atn_sl");
proto_register_field_array(proto_atn_sl, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_atn_sl(void)
{
dissector_handle_t atn_sl_handle;
atn_sl_handle = create_dissector_handle(dissect_atn_sl, proto_atn_sl);
dissector_add_for_decode_as("osi.opt_security", atn_sl_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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