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/* packet-link16.c
* Routines for Link 16 message dissection (MIL-STD-6016)
* William Robertson <aliask@gmail.com>
* Peter Ross <peter.ross@dsto.defence.gov.au>
*
* http://willrobertson.id.au/resources/wireshark/DSTO-TN-1257.pdf
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-link16.h"
void proto_register_link16(void);
/* Elmasry, G., (2012), Tactical Wireless Communications and Networks: Design Concepts and Challenges, Wiley, ISBN 9781119951766. */
enum {
WORDFORMAT_INITIAL = 0,
WORDFORMAT_CONTINUATION,
WORDFORMAT_EXTENSION
};
static const value_string WordFormat_Strings[] = {
{ WORDFORMAT_INITIAL, "Initial Word" },
{ WORDFORMAT_CONTINUATION, "Continuation Word" },
{ WORDFORMAT_EXTENSION, "Extension Word" },
{ 0, NULL },
};
/* Viasat, Inc., (2012), Link 16 Network Participant Group and Message Card, accessed from <http://www.viasat.com/files/assets/assets/Link16_NPG_Message_Card_100112a.pdf> on 15 April 2013. */
static const value_string Link16_Label_Strings[] = {
{ 0, "Network Management" },
{ 1, "Network Management" },
{ 2, "Precise Participant Location and Identification" },
{ 3, "Surveillance" },
{ 5, "Anti-submarine Warfare" },
{ 6, "Intelligence" },
{ 7, "Information Management" },
{ 8, "Information Management" },
{ 9, "Weapons Coordination and Management" },
{ 10, "Weapons Coordination and Management" },
{ 11, "Weapons Coordination and Management" },
{ 12, "Control" },
{ 13, "Platform and System Status" },
{ 14, "Electronic Warfare" },
{ 15, "Threat Warning" },
{ 16, "Imagery" },
{ 17, "Weather" },
{ 28, "National Use" },
{ 29, "National Use" },
{ 30, "National Use" },
{ 31, "Miscellaneous" },
{ 0, NULL },
};
/* Viasat, Inc., (2012), Link 16 Network Participant Group and Message Card, accessed from <http://www.viasat.com/files/assets/assets/Link16_NPG_Message_Card_100112a.pdf> on 15 April 2013. */
#define MKPAIR(a, b) (((b) << 5) | (a))
static const value_string Link16_Message_Strings[] = {
{ MKPAIR(0, 0), "Initial Entry" },
{ MKPAIR(0, 1), "Test" },
{ MKPAIR(0, 2), "Network Time Update" },
{ MKPAIR(0, 3), "Time Slot Assignment" },
{ MKPAIR(0, 4), "Radio Relay Control" },
{ MKPAIR(0, 5), "Repromulgation Relay" },
{ MKPAIR(0, 6), "Communication Control" },
{ MKPAIR(0, 7), "Time Slot Reallocation" },
{ MKPAIR(1, 0), "Connectivity Interrogation" },
{ MKPAIR(1, 1), "Connectivity Status" },
{ MKPAIR(1, 2), "Route Establishment" },
{ MKPAIR(1, 3), "Acknowledgment" },
{ MKPAIR(1, 4), "Communication Status" },
{ MKPAIR(1, 5), "Net Control Initialization" },
{ MKPAIR(1, 6), "Needline Participation Group Assignment" },
{ MKPAIR(2, 0), "Indirect Interface Unit PPLI" },
{ MKPAIR(2, 2), "Air PPLI" },
{ MKPAIR(2, 3), "Surface PPLI" },
{ MKPAIR(2, 4), "Subsurface PPLI" },
{ MKPAIR(2, 5), "Land Point PPLI" },
{ MKPAIR(2, 6), "Land Track PPLI" },
{ MKPAIR(3, 0), "Reference Point" },
{ MKPAIR(3, 1), "Emergency Point" },
{ MKPAIR(3, 2), "Air Track" },
{ MKPAIR(3, 3), "Surface Track" },
{ MKPAIR(3, 4), "Subsurface Track" },
{ MKPAIR(3, 5), "Land Point or Track" },
{ MKPAIR(3, 6), "Space Track" },
{ MKPAIR(3, 7), "Electronic Warfare Product Information" },
{ MKPAIR(5, 4), "Acoustic Bearing and Range" },
{ MKPAIR(6, 0), "Amplification" },
{ MKPAIR(7, 0), "Track Management" },
{ MKPAIR(7, 1), "Data Update Request" },
{ MKPAIR(7, 2), "Correlation" },
{ MKPAIR(7, 3), "Pointer" },
{ MKPAIR(7, 4), "Track Identifier" },
{ MKPAIR(7, 5), "IFF/SIF Management" },
{ MKPAIR(7, 6), "Filter Management" },
{ MKPAIR(7, 7), "Association" },
{ MKPAIR(8, 0), "Unit Designator" },
{ MKPAIR(8, 1), "Mission Correlator Change" },
{ MKPAIR(9, 0), "Command" },
{ MKPAIR(10, 2), "Engagement Status" },
{ MKPAIR(10, 3), "Handover" },
{ MKPAIR(10, 5), "Controlling Unit Report" },
{ MKPAIR(10, 6), "Pairing" },
{ MKPAIR(11, 0), "From the Weapon" },
{ MKPAIR(11, 1), "To the Weapon" },
{ MKPAIR(11, 2), "Weapon Coordination" },
{ MKPAIR(12, 0), "Mission Assignment" },
{ MKPAIR(12, 1), "Vector" },
{ MKPAIR(12, 2), "Precision Aircraft Direction" },
{ MKPAIR(12, 3), "Flight Path" },
{ MKPAIR(12, 4), "Controlling Unit Change" },
{ MKPAIR(12, 5), "Target/Track Correlation" },
{ MKPAIR(12, 6), "Target Sorting" },
{ MKPAIR(12, 7), "Target Bearing" },
{ MKPAIR(13, 0), "Airfield Status" },
{ MKPAIR(13, 2), "Air Platform and System Status" },
{ MKPAIR(13, 3), "Surface Platform and System Status" },
{ MKPAIR(13, 4), "Subsurface Platform and System Status" },
{ MKPAIR(13, 5), "Land Platform and System Status" },
{ MKPAIR(14, 0), "Parametric Information" },
{ MKPAIR(14, 2), "Electronic Warfare Control / Coordination" },
{ MKPAIR(15, 0), "Threat Warning" },
{ MKPAIR(16, 0), "Imagery" },
{ MKPAIR(17, 0), "Weather Over target" },
{ MKPAIR(28, 0), "U.S. National 1 (Army)" },
{ MKPAIR(28, 1), "U.S. National 2 (Navy)" },
{ MKPAIR(28, 2), "U.S. National 3 (Air Force)" },
{ MKPAIR(28, 3), "U.S. National 4 (Marine Corps)" },
{ MKPAIR(28, 4), "French National 1" },
{ MKPAIR(28, 5), "French National 2" },
{ MKPAIR(28, 6), "U.S. National 5 (NSA)" },
{ MKPAIR(28, 7), "UK National" },
{ MKPAIR(31, 0), "Over-the-Air Rekeying Management" },
{ MKPAIR(31, 1), "Over-the-Air Rekeying" },
{ MKPAIR(31, 7), "No Statement" },
{ 0, NULL },
};
/* Viasat, Inc., (2012), Link 16 Network Participant Group and Message Card, accessed from <http://www.viasat.com/files/assets/assets/Link16_NPG_Message_Card_100112a.pdf> on 15 April 2013. */
const value_string Link16_NPG_Strings[] = {
{ 1, "Initial Entry" },
{ 2, "RTT-A" },
{ 3, "RTT-B" },
{ 4, "Network Management" },
{ 5, "PPLI and Status" },
{ 6, "PPLI and Status" },
{ 7, "Surveillance" },
{ 8, "Mission Management/Weapons Coordination" },
{ 9, "Control" },
{ 11, "Image Transfer" },
{ 12, "Voice A" },
{ 13, "Voice B" },
{ 18, "Network Enabled Weapons" },
{ 19, "Fighter-to-Fighter A" },
{ 20, "Fighter-to-Fighter B" },
{ 21, "Engagement Coordination" },
{ 27, "Joint Net PPLI" },
{ 28, "Distributed Network Management" },
{ 0, NULL },
};
static int proto_link16 = -1;
static gint hf_link16_wordformat = -1;
static gint hf_link16_label = -1;
static gint hf_link16_sublabel = -1;
static gint hf_link16_mli = -1;
static gint hf_link16_contlabel = -1;
static gint ett_link16 = -1;
static int * const link16_initial_word_fields[] = {
&hf_link16_wordformat,
&hf_link16_label,
&hf_link16_sublabel,
&hf_link16_mli,
NULL
};
static int * const link16_continuation_word_fields[] = {
&hf_link16_wordformat,
&hf_link16_contlabel,
NULL
};
static int * const link16_extension_or_other_word_fields[] = {
&hf_link16_wordformat,
NULL
};
static int * const *link16_fields[4] = {
link16_initial_word_fields,
link16_continuation_word_fields,
link16_extension_or_other_word_fields,
link16_extension_or_other_word_fields
};
static int dissect_link16(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
Link16State *state = (Link16State *)data;
proto_item *link16_item = NULL;
proto_tree *link16_tree = NULL;
guint16 cache;
guint8 wordformat, contlabel;
if (!state)
REPORT_DISSECTOR_BUG("Link 16 dissector state missing");
cache = tvb_get_letohs(tvb, 0);
wordformat = cache & 0x3;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Link 16");
if (tree) {
link16_item = proto_tree_add_item(tree, proto_link16, tvb, 0, -1, ENC_NA);
link16_tree = proto_item_add_subtree(link16_item, ett_link16);
proto_tree_add_bitmask_text(link16_tree, tvb, 0, 2, "Header", NULL, ett_link16, link16_fields[wordformat], ENC_LITTLE_ENDIAN, BMT_NO_APPEND);
}
/* Elmasry, G., (2012), Tactical Wireless Communications and Networks: Design Concepts and Challenges, Wiley, ISBN 9781119951766. */
switch (wordformat) {
case WORDFORMAT_INITIAL:
state->label = (cache >> 2) & 0x1F;
state->sublabel = (cache >> 7) & 0x7;
state->extension = 0;
col_append_fstr(pinfo->cinfo, COL_INFO, " J%d.%dI", state->label, state->sublabel);
proto_item_append_text(link16_item, " J%d.%dI", state->label, state->sublabel);
break;
case WORDFORMAT_EXTENSION:
col_append_fstr(pinfo->cinfo, COL_INFO, " J%d.%dE%d", state->label, state->sublabel, state->extension);
proto_item_append_text(link16_item, " J%d.%dE%d", state->label, state->sublabel, state->extension);
state->extension++;
break;
case WORDFORMAT_CONTINUATION:
contlabel = (cache >> 2) & 0x1F;
col_append_fstr(pinfo->cinfo, COL_INFO, " J%d.%dC%d", state->label, state->sublabel, contlabel);
proto_item_append_text(link16_item, " J%d.%dC%d", state->label, state->sublabel, contlabel);
}
proto_item_append_text(link16_item, " %s", val_to_str_const(MKPAIR(state->label, state->sublabel), Link16_Message_Strings, "Unknown"));
return tvb_captured_length(tvb);
}
void proto_register_link16(void)
{
static hf_register_info hf[] = {
{ &hf_link16_wordformat,
{ "Word Format", "link16.wordformat", FT_UINT16, BASE_DEC, VALS(WordFormat_Strings), 0x0003,
NULL, HFILL }},
{ &hf_link16_label,
{ "Label", "link16.label", FT_UINT16, BASE_DEC, VALS(Link16_Label_Strings), 0x007C,
NULL, HFILL }},
{ &hf_link16_sublabel,
{ "Sublabel", "link16.sublabel", FT_UINT16, BASE_DEC, NULL, 0x0380,
NULL, HFILL }},
{ &hf_link16_mli,
{ "Message Length Indicator", "link16.mli", FT_UINT16, BASE_DEC, NULL, 0x1C00,
NULL, HFILL }},
{ &hf_link16_contlabel,
{ "Continuation Word Label", "link16.contlabel", FT_UINT16, BASE_DEC, NULL, 0x7C,
NULL, HFILL }}
};
static gint *ett[] = {
&ett_link16,
};
proto_link16 = proto_register_protocol("Link 16", "LINK16", "link16");
proto_register_field_array(proto_link16, hf, array_length (hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("link16", dissect_link16, proto_link16);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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