2003-11-24 00:34:13 +00:00
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/* packet-ccsds.c
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* Routines for CCSDS dissection
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* Copyright 2000, Scott Hovis scott.hovis@ums.msfc.nasa.gov
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2009-03-18 07:29:36 +00:00
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* Enhanced 2008, Matt Dunkle Matthew.L.Dunkle@nasa.gov
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2003-11-24 00:34:13 +00:00
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*
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2006-05-21 04:49:01 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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2003-11-24 00:34:13 +00:00
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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2011-04-27 17:58:22 +00:00
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*
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2003-11-24 00:34:13 +00:00
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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2011-04-27 17:58:22 +00:00
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*
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2003-11-24 00:34:13 +00:00
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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2012-06-28 23:18:38 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2003-11-24 00:34:13 +00:00
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2003-11-24 00:34:13 +00:00
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#include <glib.h>
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2012-05-15 19:23:35 +00:00
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2003-11-24 00:34:13 +00:00
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#include <epan/packet.h>
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2010-10-27 21:11:46 +00:00
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#include <epan/expert.h>
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#include <epan/prefs.h>
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2013-12-21 17:23:17 +00:00
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#include <epan/to_str.h>
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2003-11-24 00:34:13 +00:00
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2013-12-14 12:45:57 +00:00
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void proto_register_ccsds(void);
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void proto_reg_handoff_ccsds(void);
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2009-03-18 07:29:36 +00:00
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2003-11-24 00:34:13 +00:00
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/*
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* See
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*
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2011-02-07 18:35:22 +00:00
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* http://public.ccsds.org/publications/archive/133x0b1c1.pdf section 4.1 -- CCSDS 133.0-B-1 replaces CCSDS 701.0-B-2
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2010-10-27 21:11:46 +00:00
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* http://www.everyspec.com/NASA/NASA+-+JSC/NASA+-+SSP+PUBS/download.php?spec=SSP_52050E.003096.pdf section 3.1.3
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2010-04-25 16:37:08 +00:00
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*
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* for some information.
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2003-11-24 00:34:13 +00:00
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*/
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2009-03-18 07:29:36 +00:00
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2003-11-24 00:34:13 +00:00
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/* Initialize the protocol and registered fields */
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static int proto_ccsds = -1;
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2009-03-18 07:29:36 +00:00
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/* primary ccsds header */
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2003-11-24 00:34:13 +00:00
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static int hf_ccsds_apid = -1;
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static int hf_ccsds_version = -1;
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static int hf_ccsds_secheader = -1;
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static int hf_ccsds_type = -1;
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static int hf_ccsds_seqnum = -1;
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static int hf_ccsds_seqflag = -1;
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static int hf_ccsds_length = -1;
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2009-03-18 07:29:36 +00:00
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/* common ccsds secondary header */
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static int hf_ccsds_coarse_time = -1;
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static int hf_ccsds_fine_time = -1;
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2003-11-24 00:34:13 +00:00
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static int hf_ccsds_timeid = -1;
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2010-10-27 21:11:46 +00:00
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static int hf_ccsds_checkword_flag = -1;
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2009-03-18 07:29:36 +00:00
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/* payload specific ccsds secondary header */
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2003-11-24 00:34:13 +00:00
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static int hf_ccsds_zoe = -1;
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2009-03-18 07:29:36 +00:00
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static int hf_ccsds_packet_type_unused = -1;
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2003-11-24 00:34:13 +00:00
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static int hf_ccsds_vid = -1;
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static int hf_ccsds_dcc = -1;
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2009-03-18 07:29:36 +00:00
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/* core specific ccsds secondary header */
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2013-01-31 17:55:31 +00:00
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/* static int hf_ccsds_spare1 = -1; */
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2009-03-18 07:29:36 +00:00
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static int hf_ccsds_packet_type = -1;
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2013-01-31 17:55:31 +00:00
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/* static int hf_ccsds_spare2 = -1; */
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2009-03-18 07:29:36 +00:00
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static int hf_ccsds_element_id = -1;
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static int hf_ccsds_cmd_data_packet = -1;
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static int hf_ccsds_format_version_id = -1;
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static int hf_ccsds_extended_format_id = -1;
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2013-01-31 17:55:31 +00:00
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/* static int hf_ccsds_spare3 = -1; */
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2009-03-18 07:29:36 +00:00
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static int hf_ccsds_frame_id = -1;
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2010-10-27 21:11:46 +00:00
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/* ccsds checkword (checksum) */
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static int hf_ccsds_checkword = -1;
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static int hf_ccsds_checkword_good = -1;
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static int hf_ccsds_checkword_bad = -1;
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2003-11-24 00:34:13 +00:00
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/* Initialize the subtree pointers */
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static gint ett_ccsds = -1;
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2009-03-18 07:29:36 +00:00
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static gint ett_ccsds_primary_header = -1;
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static gint ett_ccsds_secondary_header = -1;
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2010-10-27 21:11:46 +00:00
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static gint ett_ccsds_checkword = -1;
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2013-05-25 17:06:40 +00:00
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static expert_field ei_ccsds_length_error = EI_INIT;
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2013-12-29 15:28:49 +00:00
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/* Dissectot table */
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static dissector_table_t ccsds_dissector_table;
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2010-10-27 21:11:46 +00:00
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/* Generic data handle */
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static dissector_handle_t data_handle;
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2012-11-29 20:15:37 +00:00
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static const enum_val_t dissect_checkword[] = {
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2014-04-03 03:13:06 +00:00
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{ "hdr", "Use header flag", 2 },
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{ "no", "Override header flag to be false", 0 },
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{ "yes", "Override header flag to be true", 1 },
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{ NULL, NULL, 0 }
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2010-10-27 21:11:46 +00:00
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};
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/* Global preferences */
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/* As defined above, default is to use header flag */
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static gint global_dissect_checkword = 2;
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2003-11-24 00:34:13 +00:00
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/*
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* Bits in the first 16-bit header word
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*/
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2014-04-03 03:13:06 +00:00
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#define HDR_VERSION 0xe000
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#define HDR_TYPE 0x1000
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#define HDR_SECHDR 0x0800
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#define HDR_APID 0x07ff
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2003-11-24 00:34:13 +00:00
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2009-03-18 07:29:36 +00:00
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/* some basic sizing parameters */
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enum
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{
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2014-04-03 03:13:06 +00:00
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IP_HEADER_LENGTH = 48,
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VCDU_HEADER_LENGTH = 6,
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CCSDS_PRIMARY_HEADER_LENGTH = 6,
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CCSDS_SECONDARY_HEADER_LENGTH = 10
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2009-03-18 07:29:36 +00:00
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};
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/* leap year macro */
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#ifndef Leap
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# define Leap(yr) ( ( 0 == (yr)%4 && 0 != (yr)%100 ) || ( 0 == (yr)%400 ) )
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#endif
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static const value_string ccsds_primary_header_sequence_flags[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "Continuation segment" },
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{ 1, "First segment" },
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{ 2, "Last segment" },
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{ 3, "Unsegmented data" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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static const value_string ccsds_secondary_header_type[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "Core" },
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{ 1, "Payload" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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static const value_string ccsds_secondary_header_packet_type[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "UNDEFINED" },
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{ 1, "Data Dump" },
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{ 2, "UNDEFINED" },
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{ 3, "UNDEFINED" },
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{ 4, "TLM/Status" },
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{ 5, "UNDEFINED" },
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{ 6, "Payload Private/Science" },
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{ 7, "Ancillary Data" },
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{ 8, "Essential Cmd" },
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{ 9, "System Cmd" },
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{ 10, "Payload Cmd" },
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{ 11, "Data Load/File Transfer" },
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{ 12, "UNDEFINED" },
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{ 13, "UNDEFINED" },
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{ 14, "UNDEFINED" },
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{ 15, "UNDEFINED" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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static const value_string ccsds_secondary_header_element_id[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "NASA (Ground Test Only)" },
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{ 1, "NASA" },
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{ 2, "ESA/APM" },
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{ 3, "NASDA" },
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{ 4, "RSA" },
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{ 5, "CSA" },
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{ 6, "ESA/ATV" },
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{ 7, "ASI" },
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{ 8, "ESA/ERA" },
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{ 9, "Reserved" },
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{ 10, "RSA SPP" },
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{ 11, "NASDA HTV" },
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{ 12, "Reserved" },
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{ 13, "Reserved" },
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{ 14, "Reserved" },
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{ 15, "Reserved" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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static const value_string ccsds_secondary_header_cmd_data_packet[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "Command Packet" },
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{ 1, "Data Packet" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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static const value_string ccsds_secondary_header_format_id[] = {
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2014-04-03 03:13:06 +00:00
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{ 0, "Reserved" },
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{ 1, "Essential Telemetry" },
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{ 2, "Housekeeping Tlm - 1" },
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{ 3, "Housekeeping Tlm - 2" },
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{ 4, "PCS DDT" },
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{ 5, "CCS S-Band Command Response" },
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{ 6, "Contingency Telemetry via the SMCC" },
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{ 7, "Normal Data Dump" },
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{ 8, "Extended Data Dump" },
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{ 9, "Reserved" },
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{ 10, "Reserved" },
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{ 11, "Broadcast Ancillary Data" },
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{ 12, "Reserved" },
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{ 13, "NCS to OIU Telemetry and ECOMM Telemetry" },
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{ 14, "CCS to OIU Telemetry - Direct" },
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{ 15, "Reserved" },
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{ 16, "Normal File Dump" },
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{ 17, "Extended File Dump" },
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{ 18, "NCS to FGB Telemetry" },
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{ 19, "Reserved" },
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{ 20, "ZOE Normal Dump (S-Band)" },
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{ 21, "ZOE Extended Dump (S-Band)" },
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{ 22, "EMU S-Band TLM Packet" },
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{ 23, "Reserved" },
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{ 24, "Reserved" },
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{ 25, "Reserved" },
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{ 26, "CCS to OIU Telemetry via UHF" },
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{ 27, "OSTP Telemetry (After Flight 1E, CCS R5)" },
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{ 28, "Reserved" },
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{ 29, "Reserved" },
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{ 30, "Reserved" },
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{ 31, "Reserved" },
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{ 32, "Reserved" },
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{ 33, "Reserved" },
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{ 34, "Reserved" },
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{ 35, "Reserved" },
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{ 36, "Reserved" },
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{ 37, "Reserved" },
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{ 38, "Reserved" },
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{ 39, "Reserved" },
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{ 40, "Reserved" },
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{ 41, "Reserved" },
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{ 42, "Reserved" },
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{ 43, "Reserved" },
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{ 44, "Reserved" },
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{ 45, "Reserved" },
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{ 46, "Reserved" },
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{ 47, "Reserved" },
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{ 48, "Reserved" },
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{ 49, "Reserved" },
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{ 50, "Reserved" },
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{ 51, "Reserved" },
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{ 52, "Reserved" },
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{ 53, "Reserved" },
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{ 54, "Reserved" },
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{ 55, "Reserved" },
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{ 56, "Reserved" },
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{ 57, "Reserved" },
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{ 58, "Reserved" },
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{ 59, "Reserved" },
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{ 60, "Reserved" },
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{ 61, "Reserved" },
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{ 62, "Reserved" },
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{ 63, "Reserved" },
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{ 0, NULL }
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2009-03-18 07:29:36 +00:00
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};
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2014-04-03 03:13:06 +00:00
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static value_string_ext ccsds_secondary_header_format_id_ext = VALUE_STRING_EXT_INIT(ccsds_secondary_header_format_id);
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2009-03-18 07:29:36 +00:00
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/* convert ccsds embedded time to a human readable string - NOT THREAD SAFE */
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static const char* embedded_time_to_string ( int coarse_time, int fine_time )
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{
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2014-04-03 03:13:06 +00:00
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static int utcdiff = 0;
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nstime_t t;
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int yr;
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int fraction;
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int multiplier = 1000;
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/* compute the static constant difference in seconds
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* between midnight 5-6 January 1980 (GPS time) and
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* seconds since 1/1/1970 (UTC time) just this once
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*/
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if ( 0 == utcdiff )
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{
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for ( yr = 1970; yr < 1980; ++yr )
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{
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utcdiff += ( Leap(yr) ? 366 : 365 ) * 24 * 60 * 60;
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}
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utcdiff += 5 * 24 * 60 * 60; /* five days of January 1980 */
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}
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t.secs = coarse_time + utcdiff;
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fraction = ( multiplier * ( (int)fine_time & 0xff ) ) / 256;
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t.nsecs = fraction*1000000; /* msecs to nsecs */
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|
2014-06-16 06:42:14 +00:00
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return abs_time_to_str(wmem_packet_scope(), &t, ABSOLUTE_TIME_DOY_UTC, TRUE);
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2009-03-18 07:29:36 +00:00
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}
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|
2003-11-24 00:34:13 +00:00
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/* Code to actually dissect the packets */
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static void
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dissect_ccsds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
|
2014-04-03 03:13:06 +00:00
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int offset = 0;
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proto_item *ccsds_packet;
|
|
|
|
proto_tree *ccsds_tree;
|
|
|
|
proto_item *primary_header;
|
|
|
|
proto_tree *primary_header_tree;
|
|
|
|
guint16 first_word;
|
|
|
|
guint32 coarse_time;
|
|
|
|
guint8 fine_time;
|
|
|
|
proto_item *secondary_header;
|
|
|
|
proto_tree *secondary_header_tree;
|
|
|
|
const char *time_string;
|
|
|
|
gint ccsds_length;
|
|
|
|
gint length = 0;
|
|
|
|
gint reported_length;
|
|
|
|
guint8 checkword_flag = 0;
|
|
|
|
gint counter = 0;
|
|
|
|
proto_item *item;
|
|
|
|
proto_tree *checkword_tree;
|
|
|
|
guint16 checkword_field = 0;
|
|
|
|
guint16 checkword_sum = 0;
|
|
|
|
tvbuff_t *next_tvb;
|
|
|
|
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CCSDS");
|
|
|
|
col_set_str(pinfo->cinfo, COL_INFO, "CCSDS Packet");
|
|
|
|
|
|
|
|
first_word = tvb_get_ntohs(tvb, 0);
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "APID %4d (0x%03X)", first_word&HDR_APID, first_word&HDR_APID);
|
|
|
|
|
|
|
|
reported_length = tvb_reported_length_remaining(tvb, 0);
|
|
|
|
ccsds_length = tvb_get_ntohs(tvb, 4) + CCSDS_PRIMARY_HEADER_LENGTH + 1;
|
|
|
|
|
|
|
|
|
|
|
|
/* Min length is size of headers, whereas max length is reported length.
|
|
|
|
* If the length field in the CCSDS header is outside of these bounds,
|
|
|
|
* use the value it violates. Otherwise, use the length field value.
|
|
|
|
*/
|
|
|
|
if (ccsds_length > reported_length)
|
|
|
|
length = reported_length;
|
|
|
|
else if (ccsds_length < CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH)
|
|
|
|
length = CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH;
|
|
|
|
else
|
|
|
|
length = ccsds_length;
|
|
|
|
|
|
|
|
ccsds_packet = proto_tree_add_item(tree, proto_ccsds, tvb, 0, length, ENC_NA);
|
|
|
|
ccsds_tree = proto_item_add_subtree(ccsds_packet, ett_ccsds);
|
|
|
|
|
|
|
|
/* build the ccsds primary header tree */
|
|
|
|
primary_header = proto_tree_add_text(ccsds_tree, tvb, offset, CCSDS_PRIMARY_HEADER_LENGTH, "Primary CCSDS Header");
|
|
|
|
primary_header_tree = proto_item_add_subtree(primary_header, ett_ccsds_primary_header);
|
|
|
|
|
|
|
|
proto_tree_add_uint(primary_header_tree, hf_ccsds_version, tvb, offset, 2, first_word);
|
|
|
|
proto_tree_add_uint(primary_header_tree, hf_ccsds_type, tvb, offset, 2, first_word);
|
|
|
|
proto_tree_add_boolean(primary_header_tree, hf_ccsds_secheader, tvb, offset, 2, first_word);
|
|
|
|
proto_tree_add_uint(primary_header_tree, hf_ccsds_apid, tvb, offset, 2, first_word);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
proto_tree_add_item(primary_header_tree, hf_ccsds_seqflag, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(primary_header_tree, hf_ccsds_seqnum, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
item = proto_tree_add_item(primary_header_tree, hf_ccsds_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
|
|
|
|
if (ccsds_length > reported_length) {
|
|
|
|
expert_add_info(pinfo, item, &ei_ccsds_length_error);
|
|
|
|
}
|
|
|
|
|
|
|
|
offset += 2;
|
|
|
|
proto_item_set_end(primary_header, tvb, offset);
|
|
|
|
|
|
|
|
/* build the ccsds secondary header tree */
|
|
|
|
if ( first_word & HDR_SECHDR )
|
|
|
|
{
|
|
|
|
secondary_header = proto_tree_add_text(ccsds_tree, tvb, offset, CCSDS_SECONDARY_HEADER_LENGTH, "Secondary CCSDS Header");
|
|
|
|
secondary_header_tree = proto_item_add_subtree(secondary_header, ett_ccsds_secondary_header);
|
|
|
|
|
|
|
|
/* command ccsds secondary header flags */
|
|
|
|
coarse_time = tvb_get_ntohl(tvb, offset);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_coarse_time, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
offset += 4;
|
|
|
|
|
|
|
|
fine_time = tvb_get_guint8(tvb, offset);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_fine_time, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
++offset;
|
|
|
|
|
|
|
|
time_string = embedded_time_to_string ( coarse_time, fine_time );
|
|
|
|
proto_tree_add_text(secondary_header_tree, tvb, offset-5, 5, "%s = Embedded Time", time_string);
|
|
|
|
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_timeid, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_checkword_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
|
|
|
|
/* Global Preference: how to handle checkword flag */
|
|
|
|
switch (global_dissect_checkword) {
|
|
|
|
case 0:
|
|
|
|
/* force checkword presence flag to be false */
|
|
|
|
checkword_flag = 0;
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
/* force checkword presence flag to be true */
|
|
|
|
checkword_flag = 1;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* use value of checkword presence flag from header */
|
|
|
|
checkword_flag = (tvb_get_guint8(tvb, offset)&0x20) >> 5;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* payload specific ccsds secondary header flags */
|
|
|
|
if ( first_word & HDR_TYPE )
|
|
|
|
{
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_zoe, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_packet_type_unused, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
++offset;
|
|
|
|
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_vid, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_dcc, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* core specific ccsds secondary header flags */
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare1, tvb, offset, 1, ENC_BIG_ENDIAN); */
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_packet_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
++offset;
|
|
|
|
|
|
|
|
/* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare2, tvb, offset, 2, ENC_BIG_ENDIAN); */
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_element_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_cmd_data_packet, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_format_version_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_extended_format_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
/* proto_tree_add_item(secondary_header_tree, hf_ccsds_spare3, tvb, offset, 1, ENC_BIG_ENDIAN); */
|
|
|
|
++offset;
|
|
|
|
|
|
|
|
proto_tree_add_item(secondary_header_tree, hf_ccsds_frame_id, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
++offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* finish the ccsds secondary header */
|
|
|
|
proto_item_set_end(secondary_header, tvb, offset);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If there wasn't a full packet, then don't allow a tree item for checkword. */
|
|
|
|
if (reported_length < ccsds_length || ccsds_length < CCSDS_PRIMARY_HEADER_LENGTH + CCSDS_SECONDARY_HEADER_LENGTH) {
|
|
|
|
/* Label CCSDS payload 'User Data' */
|
|
|
|
if (length > offset)
|
|
|
|
proto_tree_add_text(ccsds_tree, tvb, offset, length-offset, "User Data");
|
|
|
|
offset += length-offset;
|
|
|
|
if (checkword_flag == 1)
|
|
|
|
proto_tree_add_text(ccsds_tree, tvb, offset, 0, "Packet does not contain a Checkword");
|
|
|
|
}
|
|
|
|
/* Handle checkword according to CCSDS preference setting. */
|
|
|
|
else {
|
|
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
|
|
/* Look for a subdissector for the CCSDS payload */
|
|
|
|
if (!dissector_try_uint(ccsds_dissector_table, first_word&HDR_APID, next_tvb, pinfo, tree)) {
|
|
|
|
/* If no subdissector is found, label the CCSDS payload as 'User Data' */
|
|
|
|
proto_tree_add_text(ccsds_tree, tvb, offset, length-offset-2*checkword_flag, "User Data");
|
|
|
|
}
|
|
|
|
offset += length-offset-2*checkword_flag;
|
|
|
|
|
|
|
|
/* If checkword is present, calculate packet checksum (16-bit running sum) for comparison */
|
|
|
|
if (checkword_flag == 1) {
|
|
|
|
/* don't count the checkword as part of the checksum */
|
|
|
|
while (counter < ccsds_length-2) {
|
|
|
|
checkword_sum += tvb_get_ntohs(tvb, counter);
|
|
|
|
counter += 2;
|
|
|
|
}
|
|
|
|
checkword_field = tvb_get_ntohs(tvb, offset);
|
|
|
|
|
|
|
|
/* Report checkword status */
|
|
|
|
if (checkword_sum == checkword_field) {
|
|
|
|
item = proto_tree_add_uint_format_value(ccsds_tree, hf_ccsds_checkword, tvb, offset, 2, checkword_field,
|
|
|
|
"0x%04x [correct]", checkword_field);
|
|
|
|
checkword_tree = proto_item_add_subtree(item, ett_ccsds_checkword);
|
|
|
|
item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_good, tvb, offset, 2, TRUE);
|
|
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
|
|
item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_bad, tvb, offset, 2, FALSE);
|
|
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
|
|
} else {
|
|
|
|
item = proto_tree_add_uint_format_value(ccsds_tree, hf_ccsds_checkword, tvb, offset, 2, checkword_field,
|
|
|
|
"0x%04x [incorrect, should be 0x%04x]", checkword_field, checkword_sum);
|
|
|
|
checkword_tree = proto_item_add_subtree(item, ett_ccsds_checkword);
|
|
|
|
item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_good, tvb, offset, 2, FALSE);
|
|
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
|
|
item = proto_tree_add_boolean(checkword_tree, hf_ccsds_checkword_bad, tvb, offset, 2, TRUE);
|
|
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
|
|
}
|
|
|
|
offset += 2;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Give the data dissector any bytes past the CCSDS packet length */
|
|
|
|
call_dissector(data_handle, tvb_new_subset_remaining(tvb, offset), pinfo, tree);
|
2003-11-24 00:34:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_ccsds(void)
|
2010-10-27 21:11:46 +00:00
|
|
|
{
|
2014-04-03 03:13:06 +00:00
|
|
|
static hf_register_info hf[] = {
|
|
|
|
|
|
|
|
/* primary ccsds header flags */
|
|
|
|
{ &hf_ccsds_version,
|
|
|
|
{ "Version", "ccsds.version",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, HDR_VERSION,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_type,
|
|
|
|
{ "Type", "ccsds.type",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_type), HDR_TYPE,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_secheader,
|
|
|
|
{ "Secondary Header", "ccsds.secheader",
|
|
|
|
FT_BOOLEAN, 16, NULL, HDR_SECHDR,
|
|
|
|
"Secondary Header Present", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_apid,
|
|
|
|
{ "APID", "ccsds.apid",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, HDR_APID,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_seqflag,
|
|
|
|
{ "Sequence Flags", "ccsds.seqflag",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(ccsds_primary_header_sequence_flags), 0xc000,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_seqnum,
|
|
|
|
{ "Sequence Number", "ccsds.seqnum",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x3fff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_length,
|
|
|
|
{ "Packet Length", "ccsds.length",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0xffff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/* common ccsds secondary header flags */
|
|
|
|
{ &hf_ccsds_coarse_time,
|
|
|
|
{ "Coarse Time", "ccsds.coarse_time",
|
|
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_fine_time,
|
|
|
|
{ "Fine Time", "ccsds.fine_time",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0xff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_timeid,
|
|
|
|
{ "Time Identifier", "ccsds.timeid",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0xc0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_checkword_flag,
|
|
|
|
{ "Checkword Indicator", "ccsds.checkword_flag",
|
|
|
|
FT_BOOLEAN, 8, NULL, 0x20,
|
|
|
|
"Checkword present", HFILL }
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/* payload specific ccsds secondary header flags */
|
|
|
|
{ &hf_ccsds_zoe,
|
|
|
|
{ "ZOE TLM", "ccsds.zoe",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x10,
|
|
|
|
"Contains S-band ZOE Packets", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_packet_type_unused,
|
|
|
|
{ "Packet Type (unused for Ku-band)", "ccsds.packet_type",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0f,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_vid,
|
|
|
|
{ "Version Identifier", "ccsds.vid",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_dcc,
|
|
|
|
{ "Data Cycle Counter", "ccsds.dcc",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
|
|
|
|
|
|
|
|
/* core specific ccsds secondary header flags */
|
2013-01-31 17:55:31 +00:00
|
|
|
#if 0
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_spare1,
|
|
|
|
{ "Spare Bit 1", "ccsds.spare1",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x10,
|
|
|
|
"unused spare bit 1", HFILL }
|
|
|
|
},
|
2013-01-31 17:55:31 +00:00
|
|
|
#endif
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_packet_type,
|
|
|
|
{ "Packet Type", "ccsds.packet_type",
|
|
|
|
FT_UINT8, BASE_DEC, VALS(ccsds_secondary_header_packet_type), 0x0f,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2013-01-31 17:55:31 +00:00
|
|
|
#if 0
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_spare2,
|
|
|
|
{ "Spare Bit 2", "ccsds.spare2",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x8000,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2013-01-31 17:55:31 +00:00
|
|
|
#endif
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_element_id,
|
|
|
|
{ "Element ID", "ccsds.element_id",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_element_id), 0x7800,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_cmd_data_packet,
|
|
|
|
{ "Cmd/Data Packet Indicator", "ccsds.cmd_data_packet",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(ccsds_secondary_header_cmd_data_packet), 0x0400,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_format_version_id,
|
|
|
|
{ "Format Version ID", "ccsds.format_version_id",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x03c0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_extended_format_id,
|
|
|
|
{ "Extended Format ID", "ccsds.extended_format_id",
|
|
|
|
FT_UINT16, BASE_DEC | BASE_EXT_STRING, &ccsds_secondary_header_format_id_ext, 0x003f,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2013-01-31 17:55:31 +00:00
|
|
|
#if 0
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_spare3,
|
|
|
|
{ "Spare Bits 3", "ccsds.spare3",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0xff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2013-01-31 17:55:31 +00:00
|
|
|
#endif
|
2014-04-03 03:13:06 +00:00
|
|
|
{ &hf_ccsds_frame_id,
|
|
|
|
{ "Frame ID", "ccsds.frame_id",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0xff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_checkword,
|
|
|
|
{ "CCSDS checkword", "ccsds.checkword",
|
|
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
|
|
"CCSDS checkword: 16-bit running sum of all bytes excluding the checkword", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_checkword_good,
|
|
|
|
{ "Good", "ccsds.checkword_good",
|
|
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
|
|
"True: checkword matches packet content; False: doesn't match content", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_ccsds_checkword_bad,
|
|
|
|
{ "Bad", "ccsds.checkword_bad",
|
|
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
|
|
"True: checkword doesn't match packet content; False: matches content", HFILL }
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Setup protocol subtree array */
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_ccsds,
|
|
|
|
&ett_ccsds_primary_header,
|
|
|
|
&ett_ccsds_secondary_header,
|
|
|
|
&ett_ccsds_checkword
|
|
|
|
};
|
|
|
|
|
|
|
|
static ei_register_info ei[] = {
|
|
|
|
{ &ei_ccsds_length_error, { "ccsds.length.error", PI_MALFORMED, PI_ERROR, "Length field value is greater than the packet seen on the wire", EXPFILL }},
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Define the CCSDS preferences module */
|
|
|
|
module_t *ccsds_module;
|
|
|
|
expert_module_t* expert_ccsds;
|
|
|
|
|
|
|
|
/* Register the protocol name and description */
|
|
|
|
proto_ccsds = proto_register_protocol("CCSDS", "CCSDS", "ccsds");
|
|
|
|
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
|
|
proto_register_field_array(proto_ccsds, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
expert_ccsds = expert_register_protocol(proto_ccsds);
|
|
|
|
expert_register_field_array(expert_ccsds, ei, array_length(ei));
|
|
|
|
|
|
|
|
register_dissector ( "ccsds", dissect_ccsds, proto_ccsds );
|
|
|
|
|
|
|
|
/* Register preferences module */
|
|
|
|
ccsds_module = prefs_register_protocol(proto_ccsds, NULL);
|
|
|
|
|
|
|
|
prefs_register_enum_preference(ccsds_module, "global_pref_checkword",
|
|
|
|
"How to handle the CCSDS checkword",
|
|
|
|
"Specify how the dissector should handle the CCSDS checkword",
|
|
|
|
&global_dissect_checkword, dissect_checkword, FALSE);
|
|
|
|
|
|
|
|
/* Dissector table for sub-dissetors */
|
|
|
|
ccsds_dissector_table = register_dissector_table("ccsds.apid", "CCSDS apid", FT_UINT16, BASE_DEC);
|
2003-11-24 00:34:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_ccsds(void)
|
|
|
|
{
|
2014-06-20 16:43:28 +00:00
|
|
|
dissector_add_for_decode_as ( "udp.port", find_dissector("ccsds") );
|
2014-04-03 03:13:06 +00:00
|
|
|
data_handle = find_dissector("data");
|
2003-11-24 00:34:13 +00:00
|
|
|
}
|
2009-03-18 07:29:36 +00:00
|
|
|
|
2013-12-29 15:28:49 +00:00
|
|
|
/*
|
|
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 4
|
2014-04-03 03:13:06 +00:00
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: nil
|
2013-12-29 15:28:49 +00:00
|
|
|
* End:
|
|
|
|
*
|
2014-04-03 03:13:06 +00:00
|
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
2014-02-25 16:27:32 +00:00
|
|
|
*/
|