forked from osmocom/wireshark
3168 lines
95 KiB
C
3168 lines
95 KiB
C
/* packet-q931.c
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* Routines for Q.931 frame disassembly
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* Guy Harris <guy@alum.mit.edu>
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*
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* $Id$
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*
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* Modified by Andreas Sikkema for possible use with H.323
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998
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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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*
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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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*
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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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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <glib.h>
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#include <string.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "nlpid.h"
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#include "packet-q931.h"
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#include "packet-e164.h"
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#include <epan/prefs.h>
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#include "reassemble.h"
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#include "lapd_sapi.h"
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#include "packet-tpkt.h"
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/* Q.931 references:
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*
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* http://www.acacia-net.com/Clarinet/Protocol/q9313svn.htm
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* http://www.acacia-net.com/Clarinet/Protocol/q9311sc3.htm
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* http://www.acacia-net.com/Clarinet/Protocol/q9317oz7.htm
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* http://www.protocols.com/pbook/isdn.htm
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* http://freesoft.org/CIE/Topics/126.htm
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* http://noc.comstar.ru/miscdocs/ascend-faq-cause-codes.html
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* http://www.andrews-arnold.co.uk/isdn/q931cause.html
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* http://www.tulatelecom.ru/staff/german/DSSHelp/MessList/InfEl/InfElList.html
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*/
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static int proto_q931 = -1;
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static int hf_q931_discriminator = -1;
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static int hf_q931_coding_standard = -1;
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static int hf_q931_information_transfer_capability = -1;
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static int hf_q931_transfer_mode = -1;
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static int hf_q931_information_transfer_rate = -1;
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static int hf_q931_uil1 = -1;
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static int hf_q931_call_ref_len = -1;
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static int hf_q931_call_ref_flag = -1;
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static int hf_q931_call_ref = -1;
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static int hf_q931_message_type = -1;
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static int hf_q931_segment_type = -1;
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static int hf_q931_cause_location = -1;
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static int hf_q931_cause_value = -1;
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static int hf_q931_number_type = -1;
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static int hf_q931_numbering_plan = -1;
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static int hf_q931_extension_ind = -1;
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static int hf_q931_calling_party_number = -1;
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static int hf_q931_called_party_number = -1;
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static int hf_q931_connected_number = -1;
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static int hf_q931_redirecting_number = -1;
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static int hf_q931_screening_ind = -1;
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static int hf_q931_presentation_ind = -1;
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static int hf_q931_segments = -1;
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static int hf_q931_segment = -1;
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static int hf_q931_segment_overlap = -1;
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static int hf_q931_segment_overlap_conflict = -1;
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static int hf_q931_segment_multiple_tails = -1;
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static int hf_q931_segment_too_long_segment = -1;
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static int hf_q931_segment_error = -1;
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static int hf_q931_reassembled_in = -1;
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static gint ett_q931 = -1;
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static gint ett_q931_ie = -1;
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static gint ett_q931_segments = -1;
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static gint ett_q931_segment = -1;
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static const fragment_items q931_frag_items = {
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&ett_q931_segment,
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&ett_q931_segments,
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&hf_q931_segments,
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&hf_q931_segment,
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&hf_q931_segment_overlap,
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&hf_q931_segment_overlap_conflict,
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&hf_q931_segment_multiple_tails,
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&hf_q931_segment_too_long_segment,
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&hf_q931_segment_error,
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&hf_q931_reassembled_in,
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"segments"
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};
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/* Tables for reassembly of fragments. */
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static GHashTable *q931_fragment_table = NULL;
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static GHashTable *q931_reassembled_table = NULL;
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/* Preferences */
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static gboolean q931_reassembly = TRUE;
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static dissector_table_t codeset_dissector_table;
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static dissector_table_t ie_dissector_table;
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/* desegmentation of Q.931 over TPKT over TCP */
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static gboolean q931_desegment = TRUE;
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static dissector_handle_t h225_handle;
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static dissector_handle_t q931_tpkt_pdu_handle;
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static void
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dissect_q931_IEs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *root_tree,
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proto_tree *q931_tree, gboolean is_tpkt, int offset, int initial_codeset);
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/*
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* Q.931 message types.
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*/
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#define Q931_ESCAPE 0x00
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#define Q931_ALERTING 0x01
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#define Q931_CALL_PROCEEDING 0x02
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#define Q931_CONNECT 0x07
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#define Q931_CONNECT_ACK 0x0F
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#define Q931_PROGRESS 0x03
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#define Q931_SETUP 0x05
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#define Q931_SETUP_ACK 0x0D
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#define Q931_HOLD 0x24
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#define Q931_HOLD_ACK 0x28
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#define Q931_HOLD_REJECT 0x30
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#define Q931_RESUME 0x26
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#define Q931_RESUME_ACK 0x2E
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#define Q931_RESUME_REJECT 0x22
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#define Q931_RETRIEVE 0x31
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#define Q931_RETRIEVE_ACK 0x33
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#define Q931_RETRIEVE_REJECT 0x37
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#define Q931_SUSPEND 0x25
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#define Q931_SUSPEND_ACK 0x2D
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#define Q931_SUSPEND_REJECT 0x21
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#define Q931_USER_INFORMATION 0x20
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#define Q931_DISCONNECT 0x45
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#define Q931_RELEASE 0x4D
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#define Q931_RELEASE_COMPLETE 0x5A
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#define Q931_RESTART 0x46
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#define Q931_RESTART_ACK 0x4E
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#define Q931_CONGESTION_CONTROL 0x79
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#define Q931_FACILITY 0x62
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#define Q931_INFORMATION 0x7B
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#define Q931_NOTIFY 0x6E
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#define Q931_REGISTER 0x64
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#define Q931_SEGMENT 0x60
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#define Q931_STATUS 0x7D
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#define Q931_STATUS_ENQUIRY 0x75
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static const value_string q931_message_type_vals[] = {
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{ Q931_ESCAPE, "ESCAPE" },
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{ Q931_ALERTING, "ALERTING" },
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{ Q931_CALL_PROCEEDING, "CALL PROCEEDING" },
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{ Q931_CONNECT, "CONNECT" },
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{ Q931_CONNECT_ACK, "CONNECT ACKNOWLEDGE" },
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{ Q931_PROGRESS, "PROGRESS" },
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{ Q931_SETUP, "SETUP" },
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{ Q931_SETUP_ACK, "SETUP ACKNOWLEDGE" },
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{ Q931_HOLD, "HOLD" },
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{ Q931_HOLD_ACK, "HOLD_ACKNOWLEDGE" },
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{ Q931_HOLD_REJECT, "HOLD_REJECT" },
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{ Q931_RESUME, "RESUME" },
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{ Q931_RESUME_ACK, "RESUME ACKNOWLEDGE" },
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{ Q931_RESUME_REJECT, "RESUME REJECT" },
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{ Q931_RETRIEVE, "RETRIEVE" },
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{ Q931_RETRIEVE_ACK, "RETRIEVE ACKNOWLEDGE" },
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{ Q931_RETRIEVE_REJECT, "RETRIEVE REJECT" },
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{ Q931_SUSPEND, "SUSPEND" },
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{ Q931_SUSPEND_ACK, "SUSPEND ACKNOWLEDGE" },
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{ Q931_SUSPEND_REJECT, "SUSPEND REJECT" },
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{ Q931_USER_INFORMATION, "USER INFORMATION" },
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{ Q931_DISCONNECT, "DISCONNECT" },
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{ Q931_RELEASE, "RELEASE" },
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{ Q931_RELEASE_COMPLETE, "RELEASE COMPLETE" },
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{ Q931_RESTART, "RESTART" },
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{ Q931_RESTART_ACK, "RESTART ACKNOWLEDGE" },
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{ Q931_CONGESTION_CONTROL, "CONGESTION CONTROL" },
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{ Q931_FACILITY, "FACILITY" },
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{ Q931_INFORMATION, "INFORMATION" },
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{ Q931_NOTIFY, "NOTIFY" },
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{ Q931_REGISTER, "REGISTER" },
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{ Q931_SEGMENT, "SEGMENT" },
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{ Q931_STATUS, "STATUS" },
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{ Q931_STATUS_ENQUIRY, "STATUS ENQUIRY" },
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{ 0, NULL }
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};
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static const true_false_string tfs_call_ref_flag = {
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"Message sent to originating side",
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"Message sent from originating side"
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};
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/*
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* Information elements.
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*/
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/* Shifted codeset values */
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#define CS0 0x000
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#define CS1 0x100
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#define CS2 0x200
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#define CS3 0x300
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#define CS4 0x400
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#define CS5 0x500
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#define CS6 0x600
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#define CS7 0x700
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#define Q931_IE_SO_MASK 0x80 /* single-octet/variable-length mask */
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/*
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* Single-octet IEs.
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*/
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#define Q931_IE_SO_IDENTIFIER_MASK 0xf0 /* IE identifier mask */
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#define Q931_IE_SO_IDENTIFIER_SHIFT 4 /* IE identifier shift */
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#define Q931_IE_SO_IE_MASK 0x0F /* IE mask */
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#define Q931_IE_SHIFT 0x90
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#define Q931_IE_SHIFT_NON_LOCKING 0x08 /* non-locking shift */
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#define Q931_IE_SHIFT_CODESET 0x07 /* codeset */
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#define Q931_IE_MORE_DATA_OR_SEND_COMP 0xA0 /* More Data or Sending Complete */
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#define Q931_IE_MORE_DATA 0xA0
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#define Q931_IE_SENDING_COMPLETE 0xA1
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#define Q931_IE_CONGESTION_LEVEL 0xB0
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#define Q931_IE_REPEAT_INDICATOR 0xD0
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/*
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* Variable-length IEs.
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*/
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#define Q931_IE_VL_EXTENSION 0x80 /* Extension flag */
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/* extension bit. The bit value "0" indicates that the octet continues through the */
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/* next octet. The bit value "1" indicates that this octet is the last octet */
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static const true_false_string q931_extension_ind_value = {
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"last octet",
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"information continues through the next octet",
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};
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/*
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* Codeset 0 (default).
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*/
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#define Q931_IE_SEGMENTED_MESSAGE 0x00
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#define Q931_IE_BEARER_CAPABILITY 0x04
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#define Q931_IE_CAUSE 0x08
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#define Q931_IE_CALL_IDENTITY 0x10
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#define Q931_IE_CALL_STATE 0x14
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#define Q931_IE_CHANNEL_IDENTIFICATION 0x18
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#define Q931_IE_FACILITY 0x1C
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#define Q931_IE_PROGRESS_INDICATOR 0x1E
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#define Q931_IE_NETWORK_SPECIFIC_FACIL 0x20 /* Network Specific Facilities */
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#define Q931_IE_NOTIFICATION_INDICATOR 0x27
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#define Q931_IE_DISPLAY 0x28
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#define Q931_IE_DATE_TIME 0x29
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#define Q931_IE_KEYPAD_FACILITY 0x2C
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#define Q931_IE_INFORMATION_REQUEST 0x32
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#define Q931_IE_SIGNAL 0x34
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#define Q931_IE_SWITCHHOOK 0x36
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#define Q931_IE_FEATURE_ACTIVATION 0x38
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#define Q931_IE_FEATURE_INDICATION 0x39
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#define Q931_IE_ENDPOINT_IDENTIFIER 0x3B
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#define Q931_IE_SERVICE_PROFILE_ID 0x3A
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#define Q931_IE_INFORMATION_RATE 0x40
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#define Q931_IE_E2E_TRANSIT_DELAY 0x42 /* End-to-end Transit Delay */
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#define Q931_IE_TD_SELECTION_AND_INT 0x43 /* Transit Delay Selection and Indication */
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#define Q931_IE_PL_BINARY_PARAMETERS 0x44 /* Packet layer binary parameters */
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#define Q931_IE_PL_WINDOW_SIZE 0x45 /* Packet layer window size */
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#define Q931_IE_PACKET_SIZE 0x46 /* Packet size */
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#define Q931_IE_CUG 0x47 /* Closed user group */
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#define Q931_IE_REVERSE_CHARGE_IND 0x4A /* Reverse charging indication */
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#define Q931_IE_CONNECTED_NUMBER_DEFAULT 0x4C /* Connected Number */
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#define Q931_IE_CALLING_PARTY_NUMBER 0x6C /* Calling Party Number */
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#define Q931_IE_CALLING_PARTY_SUBADDR 0x6D /* Calling Party Subaddress */
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#define Q931_IE_CALLED_PARTY_NUMBER 0x70 /* Called Party Number */
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#define Q931_IE_CALLED_PARTY_SUBADDR 0x71 /* Called Party Subaddress */
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#define Q931_IE_REDIRECTING_NUMBER 0x74
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#define Q931_IE_REDIRECTION_NUMBER 0x76
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#define Q931_IE_TRANSIT_NETWORK_SEL 0x78 /* Transit Network Selection */
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#define Q931_IE_RESTART_INDICATOR 0x79
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#define Q931_IE_LOW_LAYER_COMPAT 0x7C /* Low-Layer Compatibility */
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#define Q931_IE_HIGH_LAYER_COMPAT 0x7D /* High-Layer Compatibility */
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#define Q931_IE_USER_USER 0x7E /* User-User */
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#define Q931_IE_ESCAPE 0x7F /* Escape for extension */
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/*
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* Codeset 0 ETSI.
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*/
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#define Q931_IE_CONNECTED_NUMBER 0x8C
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#define Q931_IE_CONNECTED_SUBADDR 0x8D
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/*
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* Codeset 5 (National-specific) Belgium.
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*/
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#define Q931_IE_CHARGING_ADVICE 0x1A
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/*
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* Codeset 5 (National-specific) Bellcore National ISDN.
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*/
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#define Q931_IE_OPERATOR_SYSTEM_ACCESS 0x1D
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/*
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* Codeset 6 (Network-specific) Belgium.
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*/
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/* 0x1A is Charging Advice, as with Codeset 5 */
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#define Q931_IE_REDIRECTING_NUMBER 0x74
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/*
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* Codeset 6 (Network-specific) FT-Numeris.
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*/
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/* 0x1D is User Capability */
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/*
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* Codeset 6 (Network-specific) Bellcore National ISDN.
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*/
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#define Q931_IE_REDIRECTING_SUBADDR 0x75 /* Redirecting Subaddress */
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/* 0x76 is Redirection Number, but that's also Codeset 0 */
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#define Q931_IE_CALL_APPEARANCE 0x7B
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/* Codeset 0 */
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static const value_string q931_info_element_vals0[] = {
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{ Q931_IE_SEGMENTED_MESSAGE, "Segmented message" },
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{ Q931_IE_BEARER_CAPABILITY, "Bearer capability" },
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{ Q931_IE_CAUSE, "Cause" },
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{ Q931_IE_CALL_IDENTITY, "Call identity" },
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{ Q931_IE_CALL_STATE, "Call state" },
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{ Q931_IE_CHANNEL_IDENTIFICATION, "Channel identification" },
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{ Q931_IE_FACILITY, "Facility" },
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{ Q931_IE_PROGRESS_INDICATOR, "Progress indicator" },
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{ Q931_IE_NETWORK_SPECIFIC_FACIL, "Network specific facilities" },
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{ Q931_IE_NOTIFICATION_INDICATOR, "Notification indicator" },
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{ Q931_IE_DISPLAY, "Display" },
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{ Q931_IE_DATE_TIME, "Date/Time" },
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{ Q931_IE_KEYPAD_FACILITY, "Keypad facility" },
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{ Q931_IE_INFORMATION_REQUEST, "Information request" },
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{ Q931_IE_SIGNAL, "Signal" },
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{ Q931_IE_SWITCHHOOK, "Switchhook" },
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{ Q931_IE_FEATURE_ACTIVATION, "Feature activation" },
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{ Q931_IE_FEATURE_INDICATION, "Feature Indication" },
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{ Q931_IE_ENDPOINT_IDENTIFIER, "Endpoint identifier" },
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{ Q931_IE_SERVICE_PROFILE_ID, "Service profile ID" },
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{ Q931_IE_INFORMATION_RATE, "Information rate" },
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{ Q931_IE_E2E_TRANSIT_DELAY, "End-to-end transit delay" },
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{ Q931_IE_TD_SELECTION_AND_INT, "Transit delay selection and indication" },
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{ Q931_IE_PL_BINARY_PARAMETERS, "Packet layer binary parameters" },
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{ Q931_IE_PL_WINDOW_SIZE, "Packet layer window size" },
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{ Q931_IE_PACKET_SIZE, "Packet size" },
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{ Q931_IE_CUG, "Closed user group" },
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{ Q931_IE_REVERSE_CHARGE_IND, "Reverse charging indication" },
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{ Q931_IE_CONNECTED_NUMBER_DEFAULT, "Connected number" },
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{ Q931_IE_CALLING_PARTY_NUMBER, "Calling party number" },
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{ Q931_IE_CALLING_PARTY_SUBADDR, "Calling party subaddress" },
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{ Q931_IE_CALLED_PARTY_NUMBER, "Called party number" },
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{ Q931_IE_CALLED_PARTY_SUBADDR, "Called party subaddress" },
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{ Q931_IE_REDIRECTING_NUMBER, "Redirecting number" },
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{ Q931_IE_REDIRECTION_NUMBER, "Redirection number" },
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{ Q931_IE_TRANSIT_NETWORK_SEL, "Transit network selection" },
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{ Q931_IE_RESTART_INDICATOR, "Restart indicator" },
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{ Q931_IE_LOW_LAYER_COMPAT, "Low-layer compatibility" },
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{ Q931_IE_HIGH_LAYER_COMPAT, "High-layer compatibility" },
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{ Q931_IE_USER_USER, "User-user" },
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{ Q931_IE_ESCAPE, "Escape" },
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{ Q931_IE_CONNECTED_NUMBER, "Connected number" },
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{ Q931_IE_CONNECTED_SUBADDR, "Connected subaddress" },
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{ 0, NULL }
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};
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/* Codeset 1 */
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static const value_string q931_info_element_vals1[] = {
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{ 0, NULL }
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};
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/* Codeset 2 */
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static const value_string q931_info_element_vals2[] = {
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{ 0, NULL }
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};
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/* Codeset 3 */
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static const value_string q931_info_element_vals3[] = {
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{ 0, NULL }
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};
|
|
/* Codeset 4 */
|
|
static const value_string q931_info_element_vals4[] = {
|
|
{ 0, NULL }
|
|
};
|
|
/* Codeset 5 */
|
|
static const value_string q931_info_element_vals5[] = {
|
|
{ Q931_IE_CHARGING_ADVICE, "Charging advice" },
|
|
{ Q931_IE_OPERATOR_SYSTEM_ACCESS, "Operator system access" },
|
|
{ 0, NULL }
|
|
};
|
|
/* Codeset 6 */
|
|
static const value_string q931_info_element_vals6[] = {
|
|
{ Q931_IE_REDIRECTING_NUMBER, "Redirecting number" },
|
|
{ Q931_IE_REDIRECTING_SUBADDR, "Redirecting subaddress" },
|
|
{ Q931_IE_CALL_APPEARANCE, "Call appearance" },
|
|
{ 0, NULL }
|
|
};
|
|
/* Codeset 7 */
|
|
static const value_string q931_info_element_vals7[] = {
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* Codeset array */
|
|
#define NUM_INFO_ELEMENT_VALS (Q931_IE_SHIFT_CODESET+1)
|
|
static const value_string *q931_info_element_vals[NUM_INFO_ELEMENT_VALS] = {
|
|
q931_info_element_vals0,
|
|
q931_info_element_vals1,
|
|
q931_info_element_vals2,
|
|
q931_info_element_vals3,
|
|
q931_info_element_vals4,
|
|
q931_info_element_vals5,
|
|
q931_info_element_vals6,
|
|
q931_info_element_vals7,
|
|
};
|
|
|
|
static const value_string q931_congestion_level_vals[] = {
|
|
{ 0x0, "Receiver ready" },
|
|
{ 0xF, "Receiver not ready" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_repeat_indication_vals[] = {
|
|
{ 0x2, "Prioritized list" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* ITU-standardized coding.
|
|
*/
|
|
#define Q931_ITU_STANDARDIZED_CODING 0x00
|
|
|
|
/*
|
|
* Dissect a Segmented message information element.
|
|
*/
|
|
static void
|
|
dissect_q931_segmented_message_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len != 2) {
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Segmented message: length is %d, should be 2", len);
|
|
return;
|
|
}
|
|
if (tvb_get_guint8(tvb, offset) & 0x80) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"First segment: %u segments remaining",
|
|
tvb_get_guint8(tvb, offset) & 0x7F);
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Not first segment: %u segments remaining",
|
|
tvb_get_guint8(tvb, offset) & 0x7F);
|
|
}
|
|
proto_tree_add_item(tree, hf_q931_segment_type, tvb, offset + 1, 1, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Dissect a Bearer capability or Low-layer compatibility information element.
|
|
*/
|
|
static const value_string q931_coding_standard_vals[] = {
|
|
{ 0x0, "ITU-T standardized coding" },
|
|
{ 0x1, "ISO/IEC standard" },
|
|
{ 0x2, "National standard" },
|
|
{ 0x3, "Standard defined for this particular network" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_information_transfer_capability_vals[] = {
|
|
{ 0x00, "Speech" },
|
|
{ 0x08, "Unrestricted digital information" },
|
|
{ 0x09, "Restricted digital information" },
|
|
{ 0x10, "3.1 kHz audio" },
|
|
{ 0x11, "Unrestricted digital information with tones/announcements" },
|
|
{ 0x18, "Video" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_transfer_mode_vals[] = {
|
|
{ 0x00, "Circuit mode" },
|
|
{ 0x02, "Packet mode" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define Q931_IT_RATE_MULTIRATE 0x18
|
|
|
|
static const value_string q931_information_transfer_rate_vals[] = {
|
|
{ 0x00, "Packet mode" },
|
|
{ 0x10, "64 kbit/s" },
|
|
{ 0x11, "2 x 64 kbit/s" },
|
|
{ 0x13, "384 kbit/s" },
|
|
{ 0x15, "1536 kbit/s" },
|
|
{ 0x17, "1920 kbit/s" },
|
|
{ Q931_IT_RATE_MULTIRATE, "Multirate (64 kbit/s base rate)" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_uil1_vals[] = {
|
|
{ 0x01, "V.110/I.460/X.30 rate adaption" },
|
|
{ 0x02, "Recommendation G.711 u-law" },
|
|
{ 0x03, "Recommendation G.711 A-law" },
|
|
{ 0x04, "Recommendation G.721 32 kbit/s ADPCM and Recommendation I.460" },
|
|
{ 0x05, "Recommendation H.221 and H.242" },
|
|
{ 0x06, "Recommendation H.223 and H.245" },
|
|
{ 0x07, "Non-ITU-T-standardized rate adaption" },
|
|
{ 0x08, "V.120 rate adaption" },
|
|
{ 0x09, "X.31 HDLC flag stuffing" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static const value_string q931_l1_user_rate_vals[] = {
|
|
{ 0x00, "Rate indicated by E-bits" },
|
|
{ 0x01, "0.6 kbit/s" },
|
|
{ 0x02, "1.2 kbit/s" },
|
|
{ 0x03, "2.4 kbit/s" },
|
|
{ 0x04, "3.6 kbit/s" },
|
|
{ 0x05, "4.8 kbit/s" },
|
|
{ 0x06, "7.2 kbit/s" },
|
|
{ 0x07, "8 kbit/s" },
|
|
{ 0x08, "9.6 kbit/s" },
|
|
{ 0x09, "14.4 kbit/s" },
|
|
{ 0x0A, "16 kbit/s" },
|
|
{ 0x0B, "19.2 kbit/s" },
|
|
{ 0x0C, "32 kbit/s" },
|
|
{ 0x0E, "48 kbit/s" },
|
|
{ 0x0F, "56 kbit/s" },
|
|
{ 0x10, "64 kbit/s "},
|
|
{ 0x15, "0.1345 kbit/s" },
|
|
{ 0x16, "0.100 kbit/s" },
|
|
{ 0x17, "0.075/1.2 kbit/s" },
|
|
{ 0x18, "1.2/0.075 kbit/s" },
|
|
{ 0x19, "0.050 kbit/s" },
|
|
{ 0x1A, "0.075 kbit/s" },
|
|
{ 0x1B, "0.110 kbit/s" },
|
|
{ 0x1C, "0.150 kbit/s" },
|
|
{ 0x1D, "0.200 kbit/s" },
|
|
{ 0x1E, "0.300 kbit/s" },
|
|
{ 0x1F, "12 kbit/s" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_l1_intermediate_rate_vals[] = {
|
|
{ 0x20, "8 kbit/s" },
|
|
{ 0x40, "16 kbit/s" },
|
|
{ 0x60, "32 kbit/s" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_l1_stop_bits_vals[] = {
|
|
{ 0x20, "1" },
|
|
{ 0x40, "1.5" },
|
|
{ 0x60, "2" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_l1_data_bits_vals[] = {
|
|
{ 0x08, "5" },
|
|
{ 0x10, "7" },
|
|
{ 0x18, "8" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_l1_parity_vals[] = {
|
|
{ 0x00, "Odd" },
|
|
{ 0x02, "Even" },
|
|
{ 0x03, "None" },
|
|
{ 0x04, "Forced to 0" },
|
|
{ 0x05, "Forced to 1" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_l1_modem_type_vals[] = {
|
|
{ 0x11, "V.21" },
|
|
{ 0x12, "V.22" },
|
|
{ 0x13, "V.22 bis" },
|
|
{ 0x14, "V.23" },
|
|
{ 0x15, "V.26" },
|
|
{ 0x16, "V.26 bis" },
|
|
{ 0x17, "V.26 ter" },
|
|
{ 0x18, "V.27" },
|
|
{ 0x19, "V.27 bis" },
|
|
{ 0x1A, "V.27 ter" },
|
|
{ 0x1B, "V.29" },
|
|
{ 0x1C, "V.32" },
|
|
{ 0x1E, "V.34" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define Q931_UIL2_USER_SPEC 0x10
|
|
|
|
static const value_string q931_uil2_vals[] = {
|
|
{ 0x01, "Basic mode ISO 1745" },
|
|
{ 0x02, "Q.921/I.441" }, /* LAPD */
|
|
{ 0x06, "X.25, link layer" }, /* LAPB */
|
|
{ 0x07, "X.25 multilink" }, /* or 0x0F? */
|
|
{ 0x08, "T.71 Extended LAPB" },
|
|
{ 0x09, "HDLC ARM" },
|
|
{ 0x0A, "HDLC NRM" },
|
|
{ 0x0B, "HDLC ABM" },
|
|
{ 0x0C, "ISO 8802/2 LLC" },
|
|
{ 0x0D, "X.75 Single Link Procedure" },
|
|
{ 0x0E, "Q.922" },
|
|
{ 0x0F, "Core aspects of Q.922" },
|
|
{ Q931_UIL2_USER_SPEC, "User-specified" },
|
|
{ 0x11, "ISO 7776 DTE-DTE operation" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_mode_vals[] = {
|
|
{ 0x20, "Normal mode" },
|
|
{ 0x40, "Extended mode" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define Q931_UIL3_X25_PL 0x06
|
|
#define Q931_UIL3_ISO_8208 0x07 /* X.25-based */
|
|
#define Q931_UIL3_X223 0x08 /* X.25-based */
|
|
#define Q931_UIL3_TR_9577 0x0B
|
|
#define Q931_UIL3_USER_SPEC 0x10
|
|
|
|
static const value_string q931_uil3_vals[] = {
|
|
{ 0x02, "Q.931/I.451" },
|
|
{ Q931_UIL3_X25_PL, "X.25, packet layer" },
|
|
{ Q931_UIL3_ISO_8208, "ISO/IEC 8208" },
|
|
{ Q931_UIL3_X223, "X.223/ISO 8878" },
|
|
{ 0x09, "ISO/IEC 8473" },
|
|
{ 0x0A, "T.70" },
|
|
{ Q931_UIL3_TR_9577, "ISO/IEC TR 9577" },
|
|
{ Q931_UIL3_USER_SPEC, "User-specified" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_protocol_discriminator(tvbuff_t *tvb, int offset, proto_tree *tree)
|
|
{
|
|
unsigned int discriminator = tvb_get_guint8(tvb, offset);
|
|
|
|
if (discriminator == NLPID_Q_931) {
|
|
proto_tree_add_uint_format(tree, hf_q931_discriminator,
|
|
tvb, offset, 1, discriminator,
|
|
"Protocol discriminator: Q.931");
|
|
} else if (discriminator == NLPID_Q_2931) {
|
|
proto_tree_add_uint_format(tree, hf_q931_discriminator,
|
|
tvb, offset, 1, discriminator,
|
|
"Protocol discriminator: Q.2931");
|
|
} else if ((discriminator >= 16 && discriminator < 63)
|
|
|| ((discriminator >= 80) && (discriminator < 254))) {
|
|
proto_tree_add_uint_format(tree, hf_q931_discriminator,
|
|
tvb, offset, 1, discriminator,
|
|
"Protocol discriminator: Network layer or layer 3 protocol (0x%02X)",
|
|
discriminator);
|
|
} else if (discriminator >= 64 && discriminator <= 79) {
|
|
proto_tree_add_uint_format(tree, hf_q931_discriminator,
|
|
tvb, offset, 1, discriminator,
|
|
"Protocol discriminator: National use (0x%02X)",
|
|
discriminator);
|
|
} else {
|
|
proto_tree_add_uint_format(tree, hf_q931_discriminator,
|
|
tvb, offset, 1, discriminator,
|
|
"Protocol discriminator: Reserved (0x%02X)",
|
|
discriminator);
|
|
}
|
|
}
|
|
|
|
void
|
|
dissect_q931_bearer_capability_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
guint8 coding_standard;
|
|
guint8 it_rate;
|
|
guint8 modem_type;
|
|
guint8 uil2_protocol;
|
|
guint8 uil3_protocol;
|
|
guint8 add_l3_info;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the bearer capability is encoded,
|
|
* so just dump it as data and be done with it.
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
return;
|
|
}
|
|
proto_tree_add_uint(tree, hf_q931_information_transfer_capability, tvb, offset, 1, octet);
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
/*
|
|
* XXX - only in Low-layer compatibility information element.
|
|
*/
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Out-band negotiation %spossible",
|
|
(octet & 0x40) ? "" : "not ");
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_q931_information_transfer_rate, tvb, offset, 1, octet);
|
|
proto_tree_add_uint(tree, hf_q931_transfer_mode, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
it_rate = octet & 0x1F;
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (it_rate == Q931_IT_RATE_MULTIRATE) {
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1, "Rate multiplier: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if ((octet & 0x60) == 0x20) {
|
|
/*
|
|
* Layer 1 information.
|
|
*/
|
|
proto_tree_add_uint(tree, hf_q931_uil1, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l1_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Layer 1 is %s",
|
|
(octet & 0x40) ? "Asynchronous" : "Synchronous");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Layer 1 in-band negotiation is %spossible",
|
|
(octet & 0x20) ? "" : "not ");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"User rate: %s",
|
|
val_to_str(octet & 0x1F, q931_l1_user_rate_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l1_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Intermediate rate: %s",
|
|
val_to_str(octet & 0x60, q931_l1_intermediate_rate_vals,
|
|
"Unknown (0x%X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s to send data with network independent clock",
|
|
(octet & 0x10) ? "Required" : "Not required");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s accept data with network independent clock",
|
|
(octet & 0x08) ? "Can" : "Cannot");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s to send data with flow control mechanism",
|
|
(octet & 0x04) ? "Required" : "Not required");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s accept data with flow control mechanism",
|
|
(octet & 0x02) ? "Can" : "Cannot");
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l1_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Rate adaption header %sincluded",
|
|
(octet & 0x40) ? "" : "not ");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Multiple frame establishment %ssupported",
|
|
(octet & 0x20) ? "" : "not ");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s mode of operation",
|
|
(octet & 0x10) ? "Protocol sensitive" : "Bit transparent");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
(octet & 0x08) ?
|
|
"Full protocol negotiation" : "LLI = 256 only");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Message originator is %s",
|
|
(octet & 0x04) ? "Assignor only" : "Default assignee");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Negotiation is done %s",
|
|
(octet & 0x02) ? "in-band" : "out-of-band");
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l1_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Stop bits: %s",
|
|
val_to_str(octet & 0x60, q931_l1_stop_bits_vals,
|
|
"Unknown (0x%X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Data bits: %s",
|
|
val_to_str(octet & 0x18, q931_l1_data_bits_vals,
|
|
"Unknown (0x%X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Parity: %s",
|
|
val_to_str(octet & 0x07, q931_l1_parity_vals,
|
|
"Unknown (0x%X)"));
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l1_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s duplex",
|
|
(octet & 0x40) ? "Full" : "Half");
|
|
modem_type = octet & 0x3F;
|
|
if (modem_type <= 0x5 ||
|
|
(modem_type >= 0x20 && modem_type <= 0x2F)) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Modem type: National use 0x%02X", modem_type);
|
|
} else if (modem_type >= 0x30) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Modem type: User specified 0x%02X", modem_type);
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Modem type: %s",
|
|
val_to_str(modem_type, q931_l1_modem_type_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
l1_done:
|
|
;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if ((octet & 0x60) == 0x40) {
|
|
/*
|
|
* Layer 2 information.
|
|
*/
|
|
uil2_protocol = octet & 0x1F;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"User information layer 2 protocol: %s",
|
|
val_to_str(uil2_protocol, q931_uil2_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
/*
|
|
* XXX - only in Low-layer compatibility information element.
|
|
*/
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l2_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if (uil2_protocol == Q931_UIL2_USER_SPEC) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"User-specified layer 2 protocol information: 0x%02X",
|
|
octet & 0x7F);
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Mode: %s",
|
|
val_to_str(octet & 0x60, q931_mode_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l2_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Window size: %u k", octet & 0x7F);
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
l2_done:
|
|
;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if ((octet & 0x60) == 0x60) {
|
|
/*
|
|
* Layer 3 information.
|
|
*/
|
|
uil3_protocol = octet & 0x1F;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"User information layer 3 protocol: %s",
|
|
val_to_str(uil3_protocol, q931_uil3_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
|
|
/*
|
|
* XXX - only in Low-layer compatibility information element.
|
|
*/
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l3_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
switch (uil3_protocol) {
|
|
|
|
case Q931_UIL3_X25_PL:
|
|
case Q931_UIL3_ISO_8208:
|
|
case Q931_UIL3_X223:
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Mode: %s",
|
|
val_to_str(octet & 0x60, q931_mode_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l3_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Default packet size: %u", octet & 0x0F);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l3_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Packet window size: %u", octet & 0x7F);
|
|
offset += 1;
|
|
len -= 1;
|
|
break;
|
|
|
|
case Q931_UIL3_USER_SPEC:
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Default packet size: %u octets",
|
|
1 << (octet & 0x0F));
|
|
offset += 1;
|
|
len -= 1;
|
|
break;
|
|
|
|
case Q931_UIL3_TR_9577:
|
|
add_l3_info = (octet & 0x0F) << 4;
|
|
if (octet & Q931_IE_VL_EXTENSION)
|
|
goto l3_done;
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset + 1);
|
|
add_l3_info |= (octet & 0x0F);
|
|
proto_tree_add_text(tree, tvb, offset, 2,
|
|
"Additional layer 3 protocol information: %s",
|
|
val_to_str(add_l3_info, nlpid_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 2;
|
|
len -= 2;
|
|
break;
|
|
}
|
|
}
|
|
l3_done:
|
|
;
|
|
}
|
|
|
|
/*
|
|
* Dissect a Cause information element.
|
|
*/
|
|
|
|
|
|
const value_string q931_cause_location_vals[] = {
|
|
{ 0x00, "User (U)" },
|
|
{ 0x01, "Private network serving the local user (LPN)" },
|
|
{ 0x02, "Public network serving the local user (LN)" },
|
|
{ 0x03, "Transit network (TN)" },
|
|
{ 0x04, "Public network serving the remote user (RLN)" },
|
|
{ 0x05, "Private network serving the remote user (RPN)" },
|
|
{ 0x07, "International network (INTL)" },
|
|
{ 0x0A, "Network beyond interworking point (BI)" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_cause_recommendation_vals[] = {
|
|
{ 0x00, "Q.931" },
|
|
{ 0x03, "X.21" },
|
|
{ 0x04, "X.25" },
|
|
{ 0x05, "Q.1031/Q.1051" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* Cause codes for Cause.
|
|
*/
|
|
#define Q931_CAUSE_UNALLOC_NUMBER 0x01
|
|
#define Q931_CAUSE_NO_ROUTE_TO_DEST 0x03
|
|
#define Q931_CAUSE_CALL_REJECTED 0x15
|
|
#define Q931_CAUSE_NUMBER_CHANGED 0x16
|
|
#define Q931_CAUSE_ACCESS_INFO_DISC 0x2B
|
|
#define Q931_CAUSE_QOS_UNAVAILABLE 0x31
|
|
#define Q931_CAUSE_CHAN_NONEXISTENT 0x52
|
|
#define Q931_CAUSE_INCOMPATIBLE_DEST 0x58
|
|
#define Q931_CAUSE_MAND_IE_MISSING 0x60
|
|
#define Q931_CAUSE_MT_NONEX_OR_UNIMPL 0x61
|
|
#define Q931_CAUSE_IE_NONEX_OR_UNIMPL 0x63
|
|
#define Q931_CAUSE_INVALID_IE_CONTENTS 0x64
|
|
#define Q931_CAUSE_MSG_INCOMPAT_W_CS 0x65
|
|
#define Q931_CAUSE_REC_TIMER_EXP 0x66
|
|
|
|
const value_string q931_cause_code_vals[] = {
|
|
{ 0x00, "Valid cause code not yet received" },
|
|
{ Q931_CAUSE_UNALLOC_NUMBER, "Unallocated (unassigned) number" },
|
|
{ 0x02, "No route to specified transit network" },
|
|
{ Q931_CAUSE_NO_ROUTE_TO_DEST, "No route to destination" },
|
|
{ 0x04, "Send special information tone" },
|
|
{ 0x05, "Misdialled trunk prefix" },
|
|
{ 0x06, "Channel unacceptable" },
|
|
{ 0x07, "Call awarded and being delivered in an established channel" },
|
|
{ 0x08, "Prefix 0 dialed but not allowed" },
|
|
/* Q.850 - "Preemption" */
|
|
{ 0x09, "Prefix 1 dialed but not allowed" },
|
|
/* Q.850 - "Preemption - circuit reserved for reuse" */
|
|
{ 0x0A, "Prefix 1 dialed but not required" },
|
|
{ 0x0B, "More digits received than allowed, call is proceeding" },
|
|
{ 0x0E, "QoR: ported number" },
|
|
{ 0x10, "Normal call clearing" },
|
|
{ 0x11, "User busy" },
|
|
{ 0x12, "No user responding" },
|
|
{ 0x13, "No answer from user (user alerted)" },
|
|
{ 0x14, "Subscriber absent" },
|
|
{ Q931_CAUSE_CALL_REJECTED, "Call rejected" },
|
|
{ Q931_CAUSE_NUMBER_CHANGED, "Number changed" },
|
|
{ 0x17, "Reverse charging rejected" },
|
|
/* Q.850 - "Redirection to new destination" */
|
|
{ 0x18, "Call suspended" },
|
|
/* Q.850 Amendment 1 - "Call rejected due to feature at the destination" */
|
|
{ 0x19, "Call resumed" },
|
|
/* Q.850 - "Exchange routing error */
|
|
{ 0x1A, "Non-selected user clearing" },
|
|
{ 0x1B, "Destination out of order" },
|
|
{ 0x1C, "Invalid number format (incomplete number)" },
|
|
{ 0x1D, "Facility rejected" },
|
|
{ 0x1E, "Response to STATUS ENQUIRY" },
|
|
{ 0x1F, "Normal unspecified" },
|
|
{ 0x21, "Circuit out of order" },
|
|
{ 0x22, "No circuit/channel available" },
|
|
{ 0x23, "Destination unattainable" },
|
|
{ 0x25, "Degraded service" },
|
|
{ 0x26, "Network out of order" },
|
|
{ 0x27, "Transit delay range cannot be achieved" },
|
|
/* Q.850 - "Permanent frame mode connection out of service" */
|
|
{ 0x28, "Throughput range cannot be achieved" },
|
|
/* Q.850 - "Permanent frame mode connection operational" */
|
|
{ 0x29, "Temporary failure" },
|
|
{ 0x2A, "Switching equipment congestion" },
|
|
{ Q931_CAUSE_ACCESS_INFO_DISC, "Access information discarded" },
|
|
{ 0x2C, "Requested circuit/channel not available" },
|
|
{ 0x2D, "Pre-empted" },
|
|
{ 0x2E, "Precedence call blocked" },
|
|
{ 0x2F, "Resources unavailable, unspecified" },
|
|
{ Q931_CAUSE_QOS_UNAVAILABLE, "Quality of service unavailable" },
|
|
{ 0x32, "Requested facility not subscribed" },
|
|
{ 0x33, "Reverse charging not allowed" },
|
|
{ 0x34, "Outgoing calls barred" },
|
|
{ 0x35, "Outgoing calls barred within CUG" },
|
|
{ 0x36, "Incoming calls barred" },
|
|
{ 0x37, "Incoming calls barred within CUG" },
|
|
{ 0x38, "Call waiting not subscribed" },
|
|
{ 0x39, "Bearer capability not authorized" },
|
|
{ 0x3A, "Bearer capability not presently available" },
|
|
{ 0x3E, "Inconsistency in designated outgoing access information and subscriber class" },
|
|
{ 0x3F, "Service or option not available, unspecified" },
|
|
{ 0x41, "Bearer capability not implemented" },
|
|
{ 0x42, "Channel type not implemented" },
|
|
{ 0x43, "Transit network selection not implemented" },
|
|
{ 0x44, "Message not implemented" },
|
|
{ 0x45, "Requested facility not implemented" },
|
|
{ 0x46, "Only restricted digital information bearer capability is available" },
|
|
{ 0x4F, "Service or option not implemented, unspecified" },
|
|
{ 0x51, "Invalid call reference value" },
|
|
{ Q931_CAUSE_CHAN_NONEXISTENT, "Identified channel does not exist" },
|
|
{ 0x53, "Call identity does not exist for suspended call" },
|
|
{ 0x54, "Call identity in use" },
|
|
{ 0x55, "No call suspended" },
|
|
{ 0x56, "Call having the requested call identity has been cleared" },
|
|
{ 0x57, "Called user not member of CUG" },
|
|
{ Q931_CAUSE_INCOMPATIBLE_DEST, "Incompatible destination" },
|
|
{ 0x59, "Non-existent abbreviated address entry" },
|
|
{ 0x5A, "Destination address missing, and direct call not subscribed" },
|
|
/* Q.850 - "Non-existent CUG" */
|
|
{ 0x5B, "Invalid transit network selection (national use)" },
|
|
{ 0x5C, "Invalid facility parameter" },
|
|
{ 0x5D, "Mandatory information element is missing" },
|
|
{ 0x5F, "Invalid message, unspecified" },
|
|
{ Q931_CAUSE_MAND_IE_MISSING, "Mandatory information element is missing" },
|
|
{ Q931_CAUSE_MT_NONEX_OR_UNIMPL,"Message type non-existent or not implemented" },
|
|
{ 0x62, "Message not compatible with call state or message type non-existent or not implemented" },
|
|
{ Q931_CAUSE_IE_NONEX_OR_UNIMPL,"Information element nonexistant or not implemented" },
|
|
{ Q931_CAUSE_INVALID_IE_CONTENTS,"Invalid information element contents" },
|
|
{ Q931_CAUSE_MSG_INCOMPAT_W_CS, "Message not compatible with call state" },
|
|
{ Q931_CAUSE_REC_TIMER_EXP, "Recovery on timer expiry" },
|
|
{ 0x67, "Parameter non-existent or not implemented - passed on" },
|
|
{ 0x6E, "Message with unrecognized parameter discarded" },
|
|
{ 0x6F, "Protocol error, unspecified" },
|
|
{ 0x7F, "Internetworking, unspecified" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_cause_condition_vals[] = {
|
|
{ 0x00, "Unknown" },
|
|
{ 0x01, "Permanent" },
|
|
{ 0x02, "Transient" },
|
|
{ 0x00, NULL }
|
|
};
|
|
|
|
#define Q931_REJ_USER_SPECIFIC 0x00
|
|
#define Q931_REJ_IE_MISSING 0x04
|
|
#define Q931_REJ_IE_INSUFFICIENT 0x08
|
|
|
|
static const value_string q931_rejection_reason_vals[] = {
|
|
{ 0x00, "User specific" },
|
|
{ 0x04, "Information element missing" },
|
|
{ 0x08, "Information element contents are not sufficient" },
|
|
{ 0x00, NULL }
|
|
};
|
|
|
|
void
|
|
dissect_q931_cause_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree, int hf_cause_value)
|
|
{
|
|
guint8 octet;
|
|
guint8 cause_value;
|
|
guint8 coding_standard;
|
|
guint8 rejection_reason;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the cause is encoded,
|
|
* so just dump it as data and be done with it.
|
|
*/
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
return;
|
|
}
|
|
proto_tree_add_uint(tree, hf_q931_cause_location, tvb, offset, 1, octet);
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Recommendation: %s",
|
|
val_to_str(octet & 0x7F, q931_cause_recommendation_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
cause_value = octet & 0x7F;
|
|
proto_tree_add_uint(tree, hf_cause_value, tvb, offset, 1, cause_value);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
switch (cause_value) {
|
|
|
|
case Q931_CAUSE_UNALLOC_NUMBER:
|
|
case Q931_CAUSE_NO_ROUTE_TO_DEST:
|
|
case Q931_CAUSE_QOS_UNAVAILABLE:
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Network service: %s",
|
|
(octet & 0x80) ? "User" : "Provider");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s",
|
|
(octet & 0x40) ? "Abnormal" : "Normal");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Condition: %s",
|
|
val_to_str(octet & 0x03, q931_cause_condition_vals,
|
|
"Unknown (0x%X)"));
|
|
break;
|
|
|
|
case Q931_CAUSE_CALL_REJECTED:
|
|
rejection_reason = octet & 0x7C;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Rejection reason: %s",
|
|
val_to_str(octet & 0x7C, q931_rejection_reason_vals,
|
|
"Unknown (0x%X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Condition: %s",
|
|
val_to_str(octet & 0x03, q931_cause_condition_vals,
|
|
"Unknown (0x%X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
switch (rejection_reason) {
|
|
|
|
case Q931_REJ_USER_SPECIFIC:
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"User specific diagnostic: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
break;
|
|
|
|
case Q931_REJ_IE_MISSING:
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Missing information element: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset), q931_info_element_vals0,
|
|
"Unknown (0x%02X)"));
|
|
break;
|
|
|
|
case Q931_REJ_IE_INSUFFICIENT:
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Insufficient information element: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset), q931_info_element_vals0,
|
|
"Unknown (0x%02X)"));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Diagnostic: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case Q931_CAUSE_ACCESS_INFO_DISC:
|
|
case Q931_CAUSE_INCOMPATIBLE_DEST:
|
|
case Q931_CAUSE_MAND_IE_MISSING:
|
|
case Q931_CAUSE_IE_NONEX_OR_UNIMPL:
|
|
case Q931_CAUSE_INVALID_IE_CONTENTS:
|
|
do {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Information element: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset), q931_info_element_vals0,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
} while (len != 0);
|
|
break;
|
|
|
|
case Q931_CAUSE_MT_NONEX_OR_UNIMPL:
|
|
case Q931_CAUSE_MSG_INCOMPAT_W_CS:
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Message type: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset), q931_message_type_vals,
|
|
"Unknown (0x%02X)"));
|
|
break;
|
|
|
|
case Q931_CAUSE_REC_TIMER_EXP:
|
|
if (len < 3)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 3,
|
|
"Timer: %.3s", tvb_get_ptr(tvb, offset, 3));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Diagnostics: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dissect a Call state information element.
|
|
*/
|
|
static const value_string q931_call_state_vals[] = {
|
|
{ 0x00, "Null" },
|
|
{ 0x01, "Call initiated" },
|
|
{ 0x02, "Overlap sending" },
|
|
{ 0x03, "Outgoing call proceeding" },
|
|
{ 0x04, "Call delivered" },
|
|
{ 0x06, "Call present" },
|
|
{ 0x07, "Call received" },
|
|
{ 0x08, "Connect request" },
|
|
{ 0x09, "Incoming call proceeding" },
|
|
{ 0x0A, "Active" },
|
|
{ 0x0B, "Disconnect request" },
|
|
{ 0x0C, "Disconnect indication" },
|
|
{ 0x0F, "Suspend request" },
|
|
{ 0x12, "Resume request" },
|
|
{ 0x13, "Release request" },
|
|
{ 0x16, "Call abort"},
|
|
{ 0x19, "Overlap receiving" },
|
|
{ 0x3D, "Restart request" },
|
|
{ 0x3E, "Restart" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_call_state_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
guint8 coding_standard;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the call state is encoded,
|
|
* so just dump it as data and be done with it.
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Call state: %s",
|
|
val_to_str(octet & 0x3F, q931_call_state_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Channel identification information element.
|
|
*/
|
|
#define Q931_INTERFACE_IDENTIFIED 0x40
|
|
#define Q931_NOT_BASIC_CHANNEL 0x20
|
|
|
|
static const value_string q931_basic_channel_selection_vals[] = {
|
|
{ 0x00, "No channel" },
|
|
{ 0x01, "B1 channel" },
|
|
{ 0x02, "B2 channel" },
|
|
{ 0x03, "Any channel" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_not_basic_channel_selection_vals[] = {
|
|
{ 0x00, "No channel" },
|
|
{ 0x01, "Channel indicated in following octets" },
|
|
{ 0x03, "Any channel" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define Q931_IS_SLOT_MAP 0x10
|
|
|
|
static const value_string q931_element_type_vals[] = {
|
|
{ 0x03, "B-channel units" },
|
|
{ 0x06, "H0-channel units" },
|
|
{ 0x08, "H11-channel units" },
|
|
{ 0x09, "H12-channel units" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_channel_identification_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
int identifier_offset;
|
|
int identifier_len;
|
|
guint8 coding_standard;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Interface %s identified",
|
|
(octet & Q931_INTERFACE_IDENTIFIED) ? "explicitly" : "implicitly");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s interface",
|
|
(octet & Q931_NOT_BASIC_CHANNEL) ? "Not basic" : "Basic");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Indicated channel is %s",
|
|
(octet & 0x08) ? "required" : "preferred");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Indicated channel is %sthe D-channel",
|
|
(octet & 0x04) ? "" : "not ");
|
|
if (octet & Q931_NOT_BASIC_CHANNEL) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Channel selection: %s",
|
|
val_to_str(octet & 0x03, q931_not_basic_channel_selection_vals,
|
|
"Unknown (0x%X)"));
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Channel selection: %s",
|
|
val_to_str(octet & 0x03, q931_basic_channel_selection_vals,
|
|
NULL));
|
|
}
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (octet & Q931_INTERFACE_IDENTIFIED) {
|
|
identifier_offset = offset;
|
|
identifier_len = 0;
|
|
do {
|
|
if (len == 0)
|
|
break;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
offset += 1;
|
|
len -= 1;
|
|
identifier_len++;
|
|
} while (!(octet & Q931_IE_VL_EXTENSION));
|
|
|
|
/*
|
|
* XXX - do we want to strip off the 8th bit on the
|
|
* last octet of the interface identifier?
|
|
*/
|
|
if (identifier_len != 0) {
|
|
proto_tree_add_text(tree, tvb, identifier_offset,
|
|
identifier_len, "Interface identifier: %s",
|
|
bytes_to_str(
|
|
tvb_get_ptr(tvb, identifier_offset, identifier_len),
|
|
identifier_len));
|
|
}
|
|
}
|
|
|
|
if (octet & Q931_NOT_BASIC_CHANNEL) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the channel identifier is
|
|
* encoded, so just dump it as data and be done
|
|
* with it.
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Channel is indicated by %s",
|
|
(octet & Q931_IS_SLOT_MAP) ? "slot map" : "number");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s type: %s",
|
|
(octet & Q931_IS_SLOT_MAP) ? "Map element" : "Channel",
|
|
val_to_str(octet & 0x0F, q931_element_type_vals,
|
|
"Unknown (0x%02X)"));
|
|
|
|
/*
|
|
* XXX - dump the channel number or slot map.
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dissect a Progress indicator information element.
|
|
*/
|
|
static const value_string q931_progress_description_vals[] = {
|
|
{ 0x01, "Call is not end-to-end ISDN - progress information available in-band" },
|
|
{ 0x02, "Destination address is non-ISDN" },
|
|
{ 0x03, "Origination address is non-ISDN" },
|
|
{ 0x04, "Call has returned to the ISDN" },
|
|
{ 0x05, "Interworking has occurred and has resulted in a telecommunications service change" },
|
|
{ 0x08, "In-band information or an appropriate pattern is now available" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
void
|
|
dissect_q931_progress_indicator_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
guint8 coding_standard;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the progress indicator is encoded,
|
|
* so just dump it as data and be done with it.
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Location: %s",
|
|
val_to_str(octet & 0x0F, q931_cause_location_vals,
|
|
"Unknown (0x%X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Progress description: %s",
|
|
val_to_str(octet & 0x7F, q931_progress_description_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Network-specific facilities or Transit network selection
|
|
* information element.
|
|
*/
|
|
static const value_string q931_netid_type_vals[] = {
|
|
{ 0x00, "User specified" },
|
|
{ 0x20, "National network identification" },
|
|
{ 0x30, "International network identification" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_netid_plan_vals[] = {
|
|
{ 0x00, "Unknown" },
|
|
{ 0x01, "Carrier Identification Code" },
|
|
{ 0x03, "X.121 data network identification code" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_ns_facilities_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
int netid_len;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
netid_len = octet & 0x7F;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Network identification length: %u",
|
|
netid_len);
|
|
offset += 1;
|
|
len -= 1;
|
|
if (netid_len != 0) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Type of network identification: %s",
|
|
val_to_str(octet & 0x70, q931_netid_type_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Network identification plan: %s",
|
|
val_to_str(octet & 0x0F, q931_netid_plan_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
netid_len--;
|
|
|
|
if (len == 0)
|
|
return;
|
|
if (netid_len > len)
|
|
netid_len = len;
|
|
if (netid_len != 0) {
|
|
proto_tree_add_text(tree, tvb, offset, netid_len,
|
|
"Network identification: %s",
|
|
tvb_format_text(tvb, offset, netid_len));
|
|
offset += netid_len;
|
|
len -= netid_len;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Whatever is left is the network-specific facility
|
|
* specification.
|
|
*/
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Network-specific facility specification: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Notification indicator information element.
|
|
*/
|
|
static const value_string q931_notification_description_vals[] = {
|
|
{ 0x00, "User suspended" },
|
|
{ 0x01, "User resumed" },
|
|
{ 0x02, "Bearer service change" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_notification_indicator_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Notification description: %s",
|
|
val_to_str(octet & 0x7F, q931_notification_description_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Date/time information element.
|
|
*/
|
|
static void
|
|
dissect_q931_date_time_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len == 6) {
|
|
/*
|
|
* XXX - what is "year" relative to? Is "month" 0-origin or
|
|
* 1-origin? Q.931 doesn't say....
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset, 6,
|
|
"Date/time: %02u-%02u-%02u %02u:%02u:%02u",
|
|
tvb_get_guint8(tvb, offset + 0), tvb_get_guint8(tvb, offset + 1), tvb_get_guint8(tvb, offset + 2),
|
|
tvb_get_guint8(tvb, offset + 3), tvb_get_guint8(tvb, offset + 4), tvb_get_guint8(tvb, offset + 5));
|
|
} else if (len == 5) {
|
|
proto_tree_add_text(tree, tvb, offset, 5,
|
|
"Date/time: %02u-%02u-%02u %02u:%02u:00",
|
|
tvb_get_guint8(tvb, offset + 0), tvb_get_guint8(tvb, offset + 1), tvb_get_guint8(tvb, offset + 2),
|
|
tvb_get_guint8(tvb, offset + 3), tvb_get_guint8(tvb, offset + 4));
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Date/time: length is %d, should be 5 or 6", len);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dissect a Signal information element.
|
|
*/
|
|
static const value_string q931_signal_vals[] = {
|
|
{ 0x00, "Dial tone on" },
|
|
{ 0x01, "Ring tone on" },
|
|
{ 0x02, "Intercept tone on" },
|
|
{ 0x03, "Network congestion tone on" }, /* "fast busy" */
|
|
{ 0x04, "Busy tone on" },
|
|
{ 0x05, "Confirm tone on" },
|
|
{ 0x06, "Answer tone on" },
|
|
{ 0x07, "Call waiting tone on" },
|
|
{ 0x08, "Off-hook warning tone on" },
|
|
{ 0x09, "Preemption tone on" },
|
|
{ 0x3F, "Tones off" },
|
|
{ 0x40, "Alerting on - pattern 0" },
|
|
{ 0x41, "Alerting on - pattern 1" },
|
|
{ 0x42, "Alerting on - pattern 2" },
|
|
{ 0x43, "Alerting on - pattern 3" },
|
|
{ 0x44, "Alerting on - pattern 4" },
|
|
{ 0x45, "Alerting on - pattern 5" },
|
|
{ 0x46, "Alerting on - pattern 6" },
|
|
{ 0x47, "Alerting on - pattern 7" },
|
|
{ 0x4F, "Alerting off" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_signal_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len != 1) {
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Signal: length is %d, should be 1", len);
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Signal: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset), q931_signal_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect an Information rate information element.
|
|
*/
|
|
static const value_string q931_throughput_class_vals[] = {
|
|
{ 0x03, "75 bit/s" },
|
|
{ 0x04, "150 bit/s" },
|
|
{ 0x05, "300 bit/s" },
|
|
{ 0x06, "600 bit/s" },
|
|
{ 0x07, "1200 bit/s" },
|
|
{ 0x08, "2400 bit/s" },
|
|
{ 0x09, "4800 bit/s" },
|
|
{ 0x0A, "9600 bit/s" },
|
|
{ 0x0B, "19200 bit/s" },
|
|
{ 0x0C, "48000 bit/s" },
|
|
{ 0x0D, "64000 bit/s" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_information_rate_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len != 4) {
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Information rate: length is %d, should be 4", len);
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset + 0, 1,
|
|
"Incoming information rate: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 0) & 0x1F,
|
|
q931_throughput_class_vals, "Unknown (0x%02X)"));
|
|
proto_tree_add_text(tree, tvb, offset + 1, 1,
|
|
"Outgoing information rate: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 1) & 0x1F,
|
|
q931_throughput_class_vals, "Unknown (0x%02X)"));
|
|
proto_tree_add_text(tree, tvb, offset + 2, 1,
|
|
"Minimum incoming information rate: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 2) & 0x1F,
|
|
q931_throughput_class_vals, "Unknown (0x%02X)"));
|
|
proto_tree_add_text(tree, tvb, offset + 3, 1,
|
|
"Minimum outgoing information rate: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 3) & 0x1F,
|
|
q931_throughput_class_vals, "Unknown (0x%02X)"));
|
|
}
|
|
|
|
static int
|
|
dissect_q931_guint16_value(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree, char *label)
|
|
{
|
|
guint8 octet;
|
|
guint16 value;
|
|
int value_len;
|
|
|
|
value_len = 0;
|
|
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if (octet & Q931_IE_VL_EXTENSION) {
|
|
/*
|
|
* Only one octet long - error.
|
|
*/
|
|
goto bad_length;
|
|
}
|
|
value = (octet & 0x3) << 14;
|
|
offset += 1;
|
|
len -= 1;
|
|
value_len++;
|
|
|
|
if (len == 0) {
|
|
/*
|
|
* We've reached the end of the information element - error.
|
|
*/
|
|
goto past_end;
|
|
}
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if (octet & Q931_IE_VL_EXTENSION) {
|
|
/*
|
|
* Only two octets long - error.
|
|
*/
|
|
goto bad_length;
|
|
}
|
|
value |= (octet & 0x7F) << 7;
|
|
offset += 1;
|
|
len -= 1;
|
|
value_len++;
|
|
|
|
if (len == 0) {
|
|
/*
|
|
* We've reached the end of the information element - error.
|
|
*/
|
|
goto past_end;
|
|
}
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
/*
|
|
* More than three octets long - error.
|
|
*/
|
|
goto bad_length;
|
|
}
|
|
value |= (octet & 0x7F);
|
|
offset += 1;
|
|
len -= 1;
|
|
value_len++;
|
|
|
|
proto_tree_add_text(tree, tvb, offset, value_len, "%s: %u ms", label,
|
|
value);
|
|
return value_len;
|
|
|
|
past_end:
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"%s goes past end of information element", label);
|
|
return -1;
|
|
|
|
bad_length:
|
|
proto_tree_add_text(tree, tvb, offset, len, "%s isn't 3 octets long",
|
|
label);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Dissect an End-to-end transit delay information element.
|
|
*/
|
|
static void
|
|
dissect_q931_e2e_transit_delay_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
int value_len;
|
|
|
|
if (len == 0)
|
|
return;
|
|
value_len = dissect_q931_guint16_value(tvb, offset, len, tree,
|
|
"Cumulative transit delay");
|
|
if (value_len < 0)
|
|
return; /* error */
|
|
offset += value_len;
|
|
len -= value_len;
|
|
|
|
if (len == 0)
|
|
return;
|
|
value_len = dissect_q931_guint16_value(tvb, offset, len, tree,
|
|
"Requested end-to-end transit delay");
|
|
if (value_len < 0)
|
|
return; /* error */
|
|
offset += value_len;
|
|
len -= value_len;
|
|
|
|
if (len == 0)
|
|
return;
|
|
value_len = dissect_q931_guint16_value(tvb, offset, len, tree,
|
|
"Maximum end-to-end transit delay");
|
|
}
|
|
|
|
/*
|
|
* Dissect a Transit delay selection and indication information element.
|
|
*/
|
|
static void
|
|
dissect_q931_td_selection_and_int_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
dissect_q931_guint16_value(tvb, offset, len, tree,
|
|
"Transit delay");
|
|
}
|
|
|
|
/*
|
|
* Dissect a Packet layer binary parameters information element.
|
|
*/
|
|
static const value_string q931_fast_selected_vals[] = {
|
|
{ 0x00, "Fast select not requested" },
|
|
{ 0x08, "Fast select not requested" },
|
|
{ 0x10, "Fast select requested with no restriction of response" },
|
|
{ 0x18, "Fast select requested with restrictions of response" },
|
|
{ 0x00, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_pl_binary_parameters_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Fast select: %s",
|
|
val_to_str(octet & 0x18, q931_fast_selected_vals, NULL));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s",
|
|
(octet & 0x04) ? "No request/request denied" :
|
|
"Request indicated/request accepted");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"%s confirmation",
|
|
(octet & 0x02) ? "Link-by-link" : "End-to-end");
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Modulus %u sequencing",
|
|
(octet & 0x01) ? 8 : 128);
|
|
}
|
|
|
|
/*
|
|
* Dissect a Packet layer window size information element.
|
|
*/
|
|
static void
|
|
dissect_q931_pl_window_size_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Forward value: %u", tvb_get_guint8(tvb, offset) & 0x7F);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Backward value: %u", tvb_get_guint8(tvb, offset) & 0x7F);
|
|
}
|
|
|
|
/*
|
|
* Dissect a Packet size information element.
|
|
*/
|
|
static void
|
|
dissect_q931_packet_size_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Forward value: %u", tvb_get_guint8(tvb, offset) & 0x7F);
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Backward value: %u", tvb_get_guint8(tvb, offset) & 0x7F);
|
|
}
|
|
|
|
/*
|
|
* Dissect a Closed user group information element.
|
|
*/
|
|
static const value_string q931_cug_indication_vals[] = {
|
|
{ 0x01, "Closed user group selection" },
|
|
{ 0x02, "Closed user group with outgoing access selection and indication" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_cug_ie(tvbuff_t *tvb, int offset, int len, proto_tree *tree)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"CUG indication: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset) & 0x07,
|
|
q931_cug_indication_vals, "Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, len, "CUG index code: %s",
|
|
tvb_format_text(tvb, offset, len));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Reverse charging indication information element.
|
|
*/
|
|
static const value_string q931_reverse_charging_indication_vals[] = {
|
|
{ 0x01, "Reverse charging requested" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_reverse_charge_ind_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Reverse charging indication: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset) & 0x07,
|
|
q931_reverse_charging_indication_vals, "Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect a (phone) number information element.
|
|
*/
|
|
static const value_string q931_number_type_vals[] = {
|
|
{ 0x0, "Unknown" },
|
|
{ 0x1, "International number" },
|
|
{ 0x2, "National number" },
|
|
{ 0x3, "Network specific number" },
|
|
{ 0x4, "Subscriber number" },
|
|
{ 0x6, "Abbreviated number" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_numbering_plan_vals[] = {
|
|
{ 0x00, "Unknown" },
|
|
{ 0x01, "E.164 ISDN/telephony numbering" },
|
|
{ 0x03, "X.121 data numbering" },
|
|
{ 0x04, "F.69 Telex numbering" },
|
|
{ 0x08, "National standard numbering" },
|
|
{ 0x09, "Private numbering" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_presentation_indicator_vals[] = {
|
|
{ 0x00, "Presentation allowed" },
|
|
{ 0x01, "Presentation restricted" },
|
|
{ 0x02, "Number not available due to interworking" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_screening_indicator_vals[] = {
|
|
{ 0x00, "User-provided, not screened" },
|
|
{ 0x01, "User-provided, verified and passed" },
|
|
{ 0x02, "User-provided, verified and failed" },
|
|
{ 0x03, "Network-provided" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_redirection_reason_vals[] = {
|
|
{ 0x00, "Unknown" },
|
|
{ 0x01, "Call forwarding busy or called DTE busy" },
|
|
{ 0x02, "Call forwarding no reply" },
|
|
{ 0x04, "Call deflection" },
|
|
{ 0x09, "Called DTE out of order" },
|
|
{ 0x0A, "Call forwarding by the called DTE" },
|
|
{ 0x0F, "Call forwarding unconditional or systematic call redirection" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_number_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree, int hfindex, e164_info_t e164_info)
|
|
{
|
|
guint8 octet;
|
|
gint number_plan;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
number_plan = octet & 0x0f;
|
|
e164_info.nature_of_address = ( octet & 0x70 ) >> 4;
|
|
proto_tree_add_uint(tree, hf_q931_numbering_plan, tvb, offset, 1, octet);
|
|
proto_tree_add_uint(tree, hf_q931_number_type, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_q931_screening_ind, tvb, offset, 1, octet);
|
|
proto_tree_add_uint(tree, hf_q931_presentation_ind, tvb, offset, 1, octet);
|
|
proto_tree_add_boolean(tree, hf_q931_extension_ind, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
/*
|
|
* XXX - only in a Redirecting number information element.
|
|
*/
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Reason for redirection: %s",
|
|
val_to_str(octet & 0x0F, q931_redirection_reason_vals,
|
|
"Unknown (0x%X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_item(tree, hfindex, tvb, offset, len, FALSE);
|
|
proto_item_append_text(proto_tree_get_parent(tree), ": '%s'", tvb_format_text(tvb, offset, len));
|
|
|
|
if ( number_plan == 1 ) {
|
|
if ( e164_info.e164_number_type != NONE ){
|
|
|
|
e164_info.E164_number_str = tvb_get_string(tvb, offset, len);
|
|
e164_info.E164_number_length = len;
|
|
dissect_e164_number(tvb, tree, offset, len, e164_info);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Dissect a party subaddress information element.
|
|
*/
|
|
static const value_string q931_subaddress_type_vals[] = {
|
|
{ 0x00, "X.213/ISO 8348 Add.2 NSAP" },
|
|
{ 0x20, "User-specified" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_odd_even_indicator_vals[] = {
|
|
{ 0x00, "Even number of address signals" },
|
|
{ 0x10, "Odd number of address signals" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_party_subaddr_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Type of subaddress: %s",
|
|
val_to_str(octet & 0x70, q931_subaddress_type_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Odd/even indicator: %s",
|
|
val_to_str(octet & 0x10, q931_odd_even_indicator_vals,
|
|
NULL));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
proto_tree_add_text(tree, tvb, offset, len, "Subaddress: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
}
|
|
|
|
/*
|
|
* Dissect a Restart indicator information element.
|
|
*/
|
|
static const value_string q931_restart_indicator_class_vals[] = {
|
|
{ 0x00, "Indicated channels" },
|
|
{ 0x06, "Single interface" },
|
|
{ 0x07, "All interfaces" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_q931_restart_indicator_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
if (len != 1) {
|
|
proto_tree_add_text(tree, tvb, offset, len,
|
|
"Restart indicator: length is %d, should be 1", len);
|
|
return;
|
|
}
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Restart indicator: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset) & 0x07,
|
|
q931_restart_indicator_class_vals, "Unknown (0x%02X)"));
|
|
}
|
|
|
|
/*
|
|
* Dissect a High-layer compatibility information element.
|
|
*/
|
|
#define Q931_AUDIOVISUAL 0x60
|
|
static const value_string q931_high_layer_characteristics_vals[] = {
|
|
{ 0x01, "Telephony" },
|
|
{ 0x04, "F.182 Facsimile Group 2/3" },
|
|
{ 0x21, "F.184 Facsimile Group 4 Class I" },
|
|
{ 0x24, "F.230 Teletex, basic and mixed mode, and F.184 Facsimile Group 4, Classes II and III" },
|
|
{ 0x28, "F.220 Teletex, basic and processable mode" },
|
|
{ 0x31, "F.200 Teletex, basic mode" },
|
|
{ 0x32, "F.300 and T.102 syntax-based Videotex" },
|
|
{ 0x33, "F.300 and T.101 international Videotex interworking" },
|
|
{ 0x35, "F.60 Telex" },
|
|
{ 0x38, "X.400 Message Handling Systems" },
|
|
{ 0x41, "X.200 OSI application" },
|
|
{ 0x42, "FTAM application" },
|
|
{ 0x5E, "Reserved for maintenance" },
|
|
{ 0x5F, "Reserved for management" },
|
|
{ Q931_AUDIOVISUAL, "F.720/F.821 and F.731 Profile 1a videotelephony" },
|
|
{ 0x61, "F.702 and F.731 Profile 1b videoconferencing" },
|
|
{ 0x62, "F.702 and F.731 audiographic conferencing" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string q931_audiovisual_characteristics_vals[] = {
|
|
{ 0x01, "Capability set of initial channel of H.221" },
|
|
{ 0x02, "Capability set of subsequent channel of H.221" },
|
|
{ 0x21, "Capability set of initial channel of an active 3.1kHz audio or speech call" },
|
|
{ 0x00, NULL }
|
|
};
|
|
|
|
void
|
|
dissect_q931_high_layer_compat_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
guint8 coding_standard;
|
|
guint8 characteristics;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
coding_standard = octet & 0x60;
|
|
proto_tree_add_uint(tree, hf_q931_coding_standard, tvb, offset, 1, octet);
|
|
offset += 1;
|
|
len -= 1;
|
|
if (coding_standard != Q931_ITU_STANDARDIZED_CODING) {
|
|
/*
|
|
* We don't know how the call state is encoded,
|
|
* so just dump it as data and be done with it.
|
|
*/
|
|
proto_tree_add_text(tree, tvb, offset,
|
|
len, "Data: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
return;
|
|
}
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
characteristics = octet & 0x7F;
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"High layer characteristics identification: %s",
|
|
val_to_str(characteristics, q931_high_layer_characteristics_vals,
|
|
"Unknown (0x%02X)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (!(octet & Q931_IE_VL_EXTENSION)) {
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
if (characteristics == Q931_AUDIOVISUAL) {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Extended audiovisual characteristics identification: %s",
|
|
val_to_str(octet & 0x7F,
|
|
q931_audiovisual_characteristics_vals,
|
|
"Unknown (0x%02X)"));
|
|
} else {
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Extended high layer characteristics identification: %s",
|
|
val_to_str(octet & 0x7F,
|
|
q931_high_layer_characteristics_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Dissect a User-user information element.
|
|
*/
|
|
#define Q931_PROTOCOL_DISCRIMINATOR_IA5 0x04
|
|
#define Q931_PROTOCOL_DISCRIMINATOR_ASN1 0x05
|
|
|
|
static const value_string q931_protocol_discriminator_vals[] = {
|
|
{ 0x00, "User-specific protocol" },
|
|
{ 0x01, "OSI high layer protocols" },
|
|
{ 0x02, "X.244" },
|
|
{ Q931_PROTOCOL_DISCRIMINATOR_IA5, "IA5 characters" },
|
|
{ Q931_PROTOCOL_DISCRIMINATOR_ASN1, "X.208 and X.209 coded user information" },
|
|
{ 0x07, "V.120 rate adaption" },
|
|
{ 0x08, "Q.931/I.451 user-network call control messages" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
void
|
|
dissect_q931_user_user_ie(tvbuff_t *tvb, int offset, int len,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 octet;
|
|
|
|
if (len == 0)
|
|
return;
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(tree, tvb, offset, 1,
|
|
"Protocol discriminator: %s",
|
|
val_to_str(octet, q931_protocol_discriminator_vals,
|
|
"Unknown (0x%02x)"));
|
|
offset += 1;
|
|
len -= 1;
|
|
|
|
if (len == 0)
|
|
return;
|
|
switch (octet) {
|
|
|
|
case Q931_PROTOCOL_DISCRIMINATOR_IA5:
|
|
proto_tree_add_text(tree, tvb, offset, len, "User information: %s",
|
|
tvb_format_text(tvb, offset, len));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(tree, tvb, offset, len, "User information: %s",
|
|
tvb_bytes_to_str(tvb, offset, len));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dissect information elements consisting of ASCII^H^H^H^H^HIA5 text.
|
|
*/
|
|
static void
|
|
dissect_q931_ia5_ie(tvbuff_t *tvb, int offset, int len, proto_tree *tree,
|
|
char *label)
|
|
{
|
|
if (len != 0) {
|
|
proto_tree_add_text(tree, tvb, offset, len, "%s: %s", label,
|
|
tvb_format_text(tvb, offset, len));
|
|
proto_item_append_text(proto_tree_get_parent(tree), " '%s'", tvb_format_text(tvb, offset, len));
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_q931_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
gboolean is_tpkt)
|
|
{
|
|
int offset = 0;
|
|
proto_tree *q931_tree = NULL;
|
|
proto_tree *ie_tree = NULL;
|
|
proto_item *ti, *ti_ie;
|
|
guint8 call_ref_len;
|
|
guint8 call_ref[15];
|
|
guint32 call_ref_val;
|
|
guint8 message_type, segmented_message_type;
|
|
guint8 info_element;
|
|
guint16 info_element_len;
|
|
gboolean more_frags;
|
|
guint32 frag_len;
|
|
fragment_data *fd_head;
|
|
tvbuff_t *next_tvb = NULL;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Q.931");
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_q931, tvb, offset, -1,
|
|
FALSE);
|
|
q931_tree = proto_item_add_subtree(ti, ett_q931);
|
|
|
|
dissect_q931_protocol_discriminator(tvb, offset, q931_tree);
|
|
}
|
|
offset += 1;
|
|
call_ref_len = tvb_get_guint8(tvb, offset) & 0xF; /* XXX - do as a bit field? */
|
|
if (q931_tree != NULL)
|
|
proto_tree_add_uint(q931_tree, hf_q931_call_ref_len, tvb, offset, 1, call_ref_len);
|
|
offset += 1;
|
|
switch (call_ref_len) {
|
|
case 0: call_ref_val = 0; break;
|
|
case 1: call_ref_val = tvb_get_guint8(tvb, offset); break;
|
|
case 2: call_ref_val = tvb_get_ntohs(tvb, offset); break;
|
|
case 3: call_ref_val = tvb_get_ntoh24(tvb, offset); break;
|
|
default: call_ref_val = tvb_get_ntohl(tvb, offset);
|
|
}
|
|
if (call_ref_len != 0) {
|
|
tvb_memcpy(tvb, call_ref, offset, call_ref_len);
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_boolean(q931_tree, hf_q931_call_ref_flag,
|
|
tvb, offset, 1, (call_ref[0] & 0x80) != 0);
|
|
call_ref[0] &= 0x7F;
|
|
proto_tree_add_bytes(q931_tree, hf_q931_call_ref,
|
|
tvb, offset, call_ref_len, call_ref);
|
|
}
|
|
offset += call_ref_len;
|
|
}
|
|
message_type = tvb_get_guint8(tvb, offset);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(message_type, q931_message_type_vals,
|
|
"Unknown message type (0x%02X)"));
|
|
}
|
|
if (q931_tree != NULL)
|
|
proto_tree_add_uint(q931_tree, hf_q931_message_type, tvb, offset, 1, message_type);
|
|
offset += 1;
|
|
|
|
/*
|
|
* And now for the information elements....
|
|
*/
|
|
if ((message_type != Q931_SEGMENT) || !q931_reassembly ||
|
|
(tvb_reported_length_remaining(tvb, offset) <= 4)) {
|
|
dissect_q931_IEs(tvb, pinfo, tree, q931_tree, is_tpkt, offset, 0);
|
|
return;
|
|
}
|
|
info_element = tvb_get_guint8(tvb, offset);
|
|
info_element_len = tvb_get_guint8(tvb, offset + 1);
|
|
if ((info_element != Q931_IE_SEGMENTED_MESSAGE) || (info_element_len < 2)) {
|
|
dissect_q931_IEs(tvb, pinfo, tree, q931_tree, is_tpkt, offset, 0);
|
|
return;
|
|
}
|
|
/* Segmented message IE */
|
|
ti_ie = proto_tree_add_text(q931_tree, tvb, offset, 1+1+info_element_len, "%s",
|
|
val_to_str(info_element, q931_info_element_vals[0], "Unknown information element (0x%02X)"));
|
|
ie_tree = proto_item_add_subtree(ti_ie, ett_q931_ie);
|
|
proto_tree_add_text(ie_tree, tvb, offset, 1, "Information element: %s",
|
|
val_to_str(info_element, q931_info_element_vals[0], "Unknown (0x%02X)"));
|
|
proto_tree_add_text(ie_tree, tvb, offset + 1, 1, "Length: %u", info_element_len);
|
|
dissect_q931_segmented_message_ie(tvb, offset + 2, info_element_len, ie_tree);
|
|
more_frags = (tvb_get_guint8(tvb, offset + 2) & 0x7F) != 0;
|
|
segmented_message_type = tvb_get_guint8(tvb, offset + 3);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " of %s",
|
|
val_to_str(segmented_message_type, q931_message_type_vals, "Unknown message type (0x%02X)"));
|
|
}
|
|
offset += 1 + 1 + info_element_len;
|
|
/* Reassembly */
|
|
frag_len = tvb_length_remaining(tvb, offset);
|
|
fd_head = fragment_add_seq_next(tvb, offset, pinfo, call_ref_val,
|
|
q931_fragment_table, q931_reassembled_table,
|
|
frag_len, more_frags);
|
|
if (fd_head) {
|
|
if (pinfo->fd->num == fd_head->reassembled_in) { /* last fragment */
|
|
if (fd_head->next != NULL) { /* 2 or more segments */
|
|
next_tvb = tvb_new_real_data(fd_head->data, fd_head->len, fd_head->len);
|
|
tvb_set_child_real_data_tvbuff(tvb, next_tvb);
|
|
add_new_data_source(pinfo, next_tvb, "Reassembled Q.931 IEs");
|
|
/* Show all fragments. */
|
|
if (tree) show_fragment_seq_tree(fd_head, &q931_frag_items, q931_tree, pinfo, next_tvb);
|
|
} else { /* only 1 segment */
|
|
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s [reassembled]",
|
|
val_to_str(segmented_message_type, q931_message_type_vals, "Unknown message type (0x%02X)"));
|
|
}
|
|
} else {
|
|
if (tree) proto_tree_add_uint(q931_tree, hf_q931_reassembled_in, tvb, offset, frag_len, fd_head->reassembled_in);
|
|
}
|
|
}
|
|
if (next_tvb)
|
|
dissect_q931_IEs(next_tvb, pinfo, tree, q931_tree, is_tpkt, 0, 0);
|
|
}
|
|
|
|
static const value_string q931_codeset_vals[] = {
|
|
{ 0x00, "Q.931 information elements" },
|
|
{ 0x04, "Information elements for ISO/IEC use" },
|
|
{ 0x05, "Information elements for national use" },
|
|
{ 0x06, "Information elements specific to the local network" },
|
|
{ 0x07, "User-specific information elements" },
|
|
{ 0x00, NULL },
|
|
};
|
|
|
|
static void
|
|
dissect_q931_IEs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *root_tree,
|
|
proto_tree *q931_tree, gboolean is_tpkt, int offset, int initial_codeset)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *ie_tree = NULL;
|
|
guint8 info_element;
|
|
guint16 info_element_len;
|
|
int codeset, locked_codeset;
|
|
gboolean non_locking_shift, first_segment;
|
|
tvbuff_t *h225_tvb, *next_tvb;
|
|
e164_info_t e164_info;
|
|
e164_info.e164_number_type = NONE;
|
|
|
|
codeset = locked_codeset = initial_codeset;
|
|
non_locking_shift = TRUE;
|
|
first_segment = FALSE;
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
info_element = tvb_get_guint8(tvb, offset);
|
|
|
|
/* Check for the codeset shift */
|
|
if ((info_element & Q931_IE_SO_MASK) &&
|
|
((info_element & Q931_IE_SO_IDENTIFIER_MASK) == Q931_IE_SHIFT)) {
|
|
non_locking_shift = info_element & Q931_IE_SHIFT_NON_LOCKING;
|
|
codeset = info_element & Q931_IE_SHIFT_CODESET;
|
|
if (!non_locking_shift)
|
|
locked_codeset = codeset;
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"%s shift to codeset %u: %s",
|
|
(non_locking_shift ? "Non-locking" : "Locking"),
|
|
codeset,
|
|
val_to_str(codeset, q931_codeset_vals,
|
|
"Unknown (0x%02X)"));
|
|
}
|
|
offset += 1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Check for the single-octet IEs.
|
|
*/
|
|
if (info_element & Q931_IE_SO_MASK) {
|
|
/*
|
|
* Check for subdissectors for this IE or
|
|
* for all IEs in this codeset.
|
|
*/
|
|
if (dissector_get_port_handle(codeset_dissector_table, codeset) ||
|
|
dissector_get_port_handle(ie_dissector_table, (codeset << 8) | (info_element & Q931_IE_SO_IDENTIFIER_MASK))) {
|
|
next_tvb = tvb_new_subset (tvb, offset, 1, 1);
|
|
if (dissector_try_port(ie_dissector_table, (codeset << 8) | (info_element & Q931_IE_SO_IDENTIFIER_MASK), next_tvb, pinfo, q931_tree) ||
|
|
dissector_try_port(codeset_dissector_table, codeset, next_tvb, pinfo, q931_tree)) {
|
|
offset += 1;
|
|
codeset = locked_codeset;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
switch ((codeset << 8) | (info_element & Q931_IE_SO_IDENTIFIER_MASK)) {
|
|
|
|
case CS0 | Q931_IE_MORE_DATA_OR_SEND_COMP:
|
|
switch (info_element) {
|
|
|
|
case Q931_IE_MORE_DATA:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"More data");
|
|
}
|
|
break;
|
|
|
|
case Q931_IE_SENDING_COMPLETE:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"Sending complete");
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"Unknown information element (0x%02X)",
|
|
info_element);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CONGESTION_LEVEL:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"Congestion level: %s",
|
|
val_to_str(info_element & Q931_IE_SO_IE_MASK,
|
|
q931_congestion_level_vals,
|
|
"Unknown (0x%X)"));
|
|
}
|
|
break;
|
|
|
|
case CS0 | Q931_IE_REPEAT_INDICATOR:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"Repeat indicator: %s",
|
|
val_to_str(info_element & Q931_IE_SO_IE_MASK,
|
|
q931_repeat_indication_vals,
|
|
"Unknown (0x%X)"));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (q931_tree != NULL) {
|
|
proto_tree_add_text(q931_tree, tvb, offset, 1,
|
|
"Unknown information element (0x%02X)",
|
|
info_element);
|
|
}
|
|
break;
|
|
}
|
|
offset += 1;
|
|
codeset = locked_codeset;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Variable-length IE.
|
|
*
|
|
* According to page 18 from Recommendation H.225.0 :
|
|
* " Length of user-user contents contents
|
|
* - Shall be 2 octets instead of 1 (as in Figure 4-36/Q.931)"
|
|
*
|
|
* We assume that if this is Q.931-over-TPKT, it might
|
|
* be H.225 traffic, and check for the IE being a user-user
|
|
* IE with ASN.1 encoding of the user information.
|
|
*/
|
|
if (is_tpkt && tvb_bytes_exist(tvb, offset, 4) &&
|
|
codeset == 0 && tvb_get_guint8(tvb, offset) == Q931_IE_USER_USER &&
|
|
tvb_get_guint8(tvb, offset + 3) == Q931_PROTOCOL_DISCRIMINATOR_ASN1) {
|
|
info_element_len = tvb_get_ntohs(tvb, offset + 1);
|
|
if (q931_tree != NULL) {
|
|
ti = proto_tree_add_text(q931_tree, tvb, offset,
|
|
1+2+info_element_len, "%s",
|
|
val_to_str(info_element,
|
|
q931_info_element_vals[codeset],
|
|
"Unknown information element (0x%02X)"));
|
|
ie_tree = proto_item_add_subtree(ti,
|
|
ett_q931_ie);
|
|
proto_tree_add_text(ie_tree, tvb, offset, 1,
|
|
"Information element: %s",
|
|
val_to_str(info_element,
|
|
q931_info_element_vals[codeset], "Unknown (0x%02X)"));
|
|
proto_tree_add_text(ie_tree, tvb, offset + 1,
|
|
2, "Length: %u", info_element_len);
|
|
proto_tree_add_text(ie_tree, tvb, offset + 3,
|
|
1, "Protocol discriminator: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 3),
|
|
q931_protocol_discriminator_vals,
|
|
"Unknown (0x%02x)"));
|
|
}
|
|
|
|
if (info_element_len > 1) {
|
|
/*
|
|
* Do we have a handle for the H.225
|
|
* dissector?
|
|
*/
|
|
if (h225_handle != NULL) {
|
|
/*
|
|
* Yes - call it, regardless of
|
|
* whether we're building a
|
|
* protocol tree or not.
|
|
*/
|
|
h225_tvb = tvb_new_subset(tvb,
|
|
offset + 4, info_element_len - 1,
|
|
info_element_len - 1);
|
|
call_dissector(h225_handle, h225_tvb,
|
|
pinfo, root_tree);
|
|
} else {
|
|
/*
|
|
* No - just show it as "User
|
|
* information" (if "ie_tree" is
|
|
* null, this won't add anything).
|
|
*/
|
|
proto_tree_add_text(ie_tree, tvb,
|
|
offset + 4, info_element_len - 1,
|
|
"User information: %s",
|
|
tvb_bytes_to_str(tvb, offset + 4,
|
|
info_element_len - 1));
|
|
}
|
|
}
|
|
offset += 1 + 2 + info_element_len;
|
|
} else {
|
|
info_element_len = tvb_get_guint8(tvb, offset + 1);
|
|
|
|
if (first_segment && (tvb_reported_length_remaining(tvb, offset + 2) < info_element_len)) { /* incomplete IE at the end of the 1st segment */
|
|
proto_tree_add_text(q931_tree, tvb, offset, tvb_reported_length_remaining(tvb, offset), "Incomplete IE in the 1st segment");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check for subdissectors for this IE or
|
|
* for all IEs in this codeset.
|
|
*/
|
|
if (dissector_get_port_handle(codeset_dissector_table, codeset) ||
|
|
dissector_get_port_handle(ie_dissector_table, (codeset << 8) | info_element)) {
|
|
next_tvb = tvb_new_subset (tvb, offset, info_element_len + 2, info_element_len + 2);
|
|
if (dissector_try_port(ie_dissector_table, (codeset << 8) | info_element, next_tvb, pinfo, q931_tree) ||
|
|
dissector_try_port(codeset_dissector_table, codeset, next_tvb, pinfo, q931_tree)) {
|
|
offset += 2 + info_element_len;
|
|
codeset = locked_codeset;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
ti = proto_tree_add_text(q931_tree, tvb, offset, 1+1+info_element_len, "%s",
|
|
val_to_str(info_element, q931_info_element_vals[codeset], "Unknown information element (0x%02X)"));
|
|
ie_tree = proto_item_add_subtree(ti, ett_q931_ie);
|
|
proto_tree_add_text(ie_tree, tvb, offset, 1, "Information element: %s",
|
|
val_to_str(info_element, q931_info_element_vals[codeset], "Unknown (0x%02X)"));
|
|
proto_tree_add_text(ie_tree, tvb, offset + 1, 1, "Length: %u", info_element_len);
|
|
|
|
if (((codeset << 8) | info_element) == (CS0 | Q931_IE_SEGMENTED_MESSAGE)) {
|
|
dissect_q931_segmented_message_ie(tvb, offset + 2, info_element_len, ie_tree);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " of %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 3), q931_message_type_vals, "Unknown message type (0x%02X)"));
|
|
}
|
|
if (tvb_get_guint8(tvb, offset + 2) & 0x80) { /* the 1st segment */
|
|
first_segment = TRUE;
|
|
} else { /* not the 1st segment */
|
|
proto_tree_add_text(q931_tree, tvb, offset + 4, tvb_reported_length_remaining(tvb, offset + 4), "Message segment");
|
|
info_element_len += tvb_reported_length_remaining(tvb, offset + 4);
|
|
}
|
|
} else if (q931_tree != NULL) {
|
|
switch ((codeset << 8) | info_element) {
|
|
|
|
case CS0 | Q931_IE_BEARER_CAPABILITY:
|
|
case CS0 | Q931_IE_LOW_LAYER_COMPAT:
|
|
dissect_q931_bearer_capability_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CAUSE:
|
|
dissect_q931_cause_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree,
|
|
hf_q931_cause_value);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CALL_STATE:
|
|
dissect_q931_call_state_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CHANNEL_IDENTIFICATION:
|
|
dissect_q931_channel_identification_ie(
|
|
tvb, offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_PROGRESS_INDICATOR:
|
|
dissect_q931_progress_indicator_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_NETWORK_SPECIFIC_FACIL:
|
|
case CS0 | Q931_IE_TRANSIT_NETWORK_SEL:
|
|
dissect_q931_ns_facilities_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_NOTIFICATION_INDICATOR:
|
|
dissect_q931_notification_indicator_ie(
|
|
tvb, offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_DISPLAY:
|
|
dissect_q931_ia5_ie(tvb, offset + 2,
|
|
info_element_len, ie_tree,
|
|
"Display information");
|
|
break;
|
|
|
|
case CS0 | Q931_IE_DATE_TIME:
|
|
dissect_q931_date_time_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_KEYPAD_FACILITY:
|
|
dissect_q931_ia5_ie(tvb, offset + 2,
|
|
info_element_len, ie_tree,
|
|
"Keypad facility");
|
|
break;
|
|
|
|
case CS0 | Q931_IE_SIGNAL:
|
|
dissect_q931_signal_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_INFORMATION_RATE:
|
|
dissect_q931_information_rate_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_E2E_TRANSIT_DELAY:
|
|
dissect_q931_e2e_transit_delay_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_TD_SELECTION_AND_INT:
|
|
dissect_q931_td_selection_and_int_ie(
|
|
tvb, offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_PL_BINARY_PARAMETERS:
|
|
dissect_q931_pl_binary_parameters_ie(
|
|
tvb, offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_PL_WINDOW_SIZE:
|
|
dissect_q931_pl_window_size_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_PACKET_SIZE:
|
|
dissect_q931_packet_size_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CUG:
|
|
dissect_q931_cug_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_REVERSE_CHARGE_IND:
|
|
dissect_q931_reverse_charge_ind_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CALLING_PARTY_NUMBER:
|
|
e164_info.e164_number_type = CALLING_PARTY_NUMBER;
|
|
dissect_q931_number_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree,
|
|
hf_q931_calling_party_number, e164_info);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CONNECTED_NUMBER_DEFAULT:
|
|
dissect_q931_number_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree,
|
|
hf_q931_connected_number, e164_info);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CALLED_PARTY_NUMBER:
|
|
e164_info.e164_number_type = CALLED_PARTY_NUMBER;
|
|
dissect_q931_number_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree,
|
|
hf_q931_called_party_number, e164_info);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_REDIRECTING_NUMBER:
|
|
dissect_q931_number_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree,
|
|
hf_q931_redirecting_number, e164_info);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_CALLING_PARTY_SUBADDR:
|
|
case CS0 | Q931_IE_CALLED_PARTY_SUBADDR:
|
|
dissect_q931_party_subaddr_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_RESTART_INDICATOR:
|
|
dissect_q931_restart_indicator_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_HIGH_LAYER_COMPAT:
|
|
dissect_q931_high_layer_compat_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
case CS0 | Q931_IE_USER_USER:
|
|
dissect_q931_user_user_ie(tvb,
|
|
offset + 2, info_element_len,
|
|
ie_tree);
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(ie_tree, tvb,
|
|
offset + 2, info_element_len,
|
|
"Data: %s",
|
|
bytes_to_str(
|
|
tvb_get_ptr(tvb, offset + 2,
|
|
info_element_len),
|
|
info_element_len));
|
|
break;
|
|
}
|
|
}
|
|
offset += 1 + 1 + info_element_len;
|
|
}
|
|
codeset = locked_codeset;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Q.931-over-TPKT-over-TCP.
|
|
*/
|
|
static gboolean
|
|
dissect_q931_tpkt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int lv_tpkt_len;
|
|
|
|
/*
|
|
* Check whether this looks like a TPKT-encapsulated
|
|
* Q.931 packet.
|
|
*
|
|
* The minimum length of a Q.931 message is 3:
|
|
* 1 byte for the protocol discriminator,
|
|
* 1 for the call_reference length,
|
|
* and one for the message type.
|
|
*/
|
|
lv_tpkt_len = is_tpkt(tvb, 3);
|
|
if (lv_tpkt_len == -1) {
|
|
/*
|
|
* It's not a TPKT packet; reject it.
|
|
*/
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* If this segment is *exactly* the length of a TPKT header,
|
|
* we assume that, as it looks like a TPKT header, it
|
|
* is one, and that the code put a TPKT header in one
|
|
* segment and the rest of the PDU in another.
|
|
*/
|
|
if (tvb_length(tvb) == 4) {
|
|
/*
|
|
* It is - call the "dissect TPKT over a TCP stream"
|
|
* routine.
|
|
*/
|
|
dissect_tpkt_encap(tvb, pinfo, tree, q931_desegment,
|
|
q931_tpkt_pdu_handle);
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Well, we have more data than just the TPKT header;
|
|
* check whether it looks like the beginning of a
|
|
* Q.931 message.
|
|
*
|
|
* The minimum length of a Q.931 message is 3, as per the
|
|
* above.
|
|
*
|
|
* Check that we have that many bytes past the TPKT header in
|
|
* the tvbuff; we already know that the TPKT header says we
|
|
* have that many bytes (as we passed 3 as the "min_len" argument
|
|
* to "is_tpkt()").
|
|
*/
|
|
if (!tvb_bytes_exist(tvb, 4, 3))
|
|
return FALSE;
|
|
|
|
/* Check the protocol discriminator */
|
|
if (tvb_get_guint8(tvb, 4) != NLPID_Q_931) {
|
|
/* Doesn't look like Q.931 inside TPKT */
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* OK, it looks like Q.931-over-TPKT.
|
|
* Call the "dissect TPKT over a TCP stream" routine.
|
|
*/
|
|
dissect_tpkt_encap(tvb, pinfo, tree, q931_desegment,
|
|
q931_tpkt_pdu_handle);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
dissect_q931_tpkt_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_q931_pdu(tvb, pinfo, tree, TRUE);
|
|
}
|
|
|
|
static void
|
|
dissect_q931(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_q931_pdu(tvb, pinfo, tree, FALSE);
|
|
}
|
|
|
|
static void
|
|
dissect_q931_ie_cs0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_q931_IEs(tvb, pinfo, NULL, tree, FALSE, 0, 0);
|
|
}
|
|
|
|
static void
|
|
dissect_q931_ie_cs7(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_q931_IEs(tvb, pinfo, NULL, tree, FALSE, 0, 7);
|
|
}
|
|
|
|
static void
|
|
q931_init(void) {
|
|
/* Initialize the fragment and reassembly tables */
|
|
fragment_table_init(&q931_fragment_table);
|
|
reassembled_table_init(&q931_reassembled_table);
|
|
}
|
|
|
|
void
|
|
proto_register_q931(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_q931_discriminator,
|
|
{ "Protocol discriminator", "q931.disc", FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_call_ref_len,
|
|
{ "Call reference value length", "q931.call_ref_len", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_call_ref_flag,
|
|
{ "Call reference flag", "q931.call_ref_flag", FT_BOOLEAN, BASE_NONE, TFS(&tfs_call_ref_flag), 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_call_ref,
|
|
{ "Call reference value", "q931.call_ref", FT_BYTES, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_message_type,
|
|
{ "Message type", "q931.message_type", FT_UINT8, BASE_HEX, VALS(q931_message_type_vals), 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_segment_type,
|
|
{ "Segmented message type", "q931.segment_type", FT_UINT8, BASE_HEX, VALS(q931_message_type_vals), 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_coding_standard,
|
|
{ "Coding standard", "q931.coding_standard", FT_UINT8, BASE_HEX,
|
|
VALS(q931_coding_standard_vals), 0x60,"", HFILL }},
|
|
|
|
{ &hf_q931_information_transfer_capability,
|
|
{ "Information transfer capability", "q931.information_transfer_capability", FT_UINT8, BASE_HEX,
|
|
VALS(q931_information_transfer_capability_vals), 0x1f,"", HFILL }},
|
|
|
|
{ &hf_q931_transfer_mode,
|
|
{ "Transfer mode", "q931.transfer_mode", FT_UINT8, BASE_HEX,
|
|
VALS(q931_transfer_mode_vals), 0x60,"", HFILL }},
|
|
|
|
{ &hf_q931_information_transfer_rate,
|
|
{ "Information transfer rate", "q931.information_transfer_rate", FT_UINT8, BASE_HEX,
|
|
VALS(q931_information_transfer_rate_vals), 0x1f,"", HFILL }},
|
|
|
|
{ &hf_q931_uil1,
|
|
{ "User information layer 1 protocol", "q931.uil1", FT_UINT8, BASE_HEX,
|
|
VALS(q931_uil1_vals), 0x1f,"", HFILL }},
|
|
|
|
{ &hf_q931_cause_location,
|
|
{ "Cause location", "q931.cause_location", FT_UINT8, BASE_DEC, VALS(q931_cause_location_vals), 0x0f,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_cause_value,
|
|
{ "Cause value", "q931.cause_value", FT_UINT8, BASE_DEC, VALS(q931_cause_code_vals), 0x7f,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_number_type,
|
|
{ "Number type", "q931.number_type", FT_UINT8, BASE_HEX, VALS(q931_number_type_vals), 0x70,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_numbering_plan,
|
|
{ "Numbering plan", "q931.numbering_plan", FT_UINT8, BASE_HEX, VALS(q931_numbering_plan_vals), 0x0f,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_screening_ind,
|
|
{ "Screening indicator", "q931.screening_ind", FT_UINT8, BASE_HEX, VALS(q931_screening_indicator_vals), 0x03,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_presentation_ind,
|
|
{ "Presentation indicator", "q931.presentation_ind", FT_UINT8, BASE_HEX, VALS(q931_presentation_indicator_vals), 0x60,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_extension_ind,
|
|
{ "Extension indicator", "q931.extension_ind",
|
|
FT_BOOLEAN, 8, TFS(&q931_extension_ind_value), 0x80,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_calling_party_number,
|
|
{ "Calling party number digits", "q931.calling_party_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_called_party_number,
|
|
{ "Called party number digits", "q931.called_party_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_connected_number,
|
|
{ "Connected party number digits", "q931.connected_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_q931_redirecting_number,
|
|
{ "Redirecting party number digits", "q931.redirecting_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
/* desegmentation fields */
|
|
{ &hf_q931_segment_overlap,
|
|
{ "Segment overlap", "q931.segment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{ &hf_q931_segment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "q931.segment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{ &hf_q931_segment_multiple_tails,
|
|
{ "Multiple tail fragments found", "q931.segment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{ &hf_q931_segment_too_long_segment,
|
|
{ "Segment too long", "q931.segment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Segment contained data past end of packet", HFILL }},
|
|
|
|
{ &hf_q931_segment_error,
|
|
{ "Defragmentation error", "q931.segment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{ &hf_q931_segment,
|
|
{ "Q.931 Segment", "q931.segment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Q.931 Segment", HFILL }},
|
|
|
|
{ &hf_q931_segments,
|
|
{ "Q.931 Segments", "q931.segments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"Q.931 Segments", HFILL }},
|
|
|
|
{ &hf_q931_reassembled_in,
|
|
{ "Reassembled Q.931 in frame", "q931.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"This Q.931 message is reassembled in this frame", HFILL}},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_q931,
|
|
&ett_q931_ie,
|
|
&ett_q931_segments,
|
|
&ett_q931_segment,
|
|
};
|
|
module_t *q931_module;
|
|
|
|
proto_q931 = proto_register_protocol("Q.931", "Q.931", "q931");
|
|
proto_register_field_array (proto_q931, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
register_init_routine(q931_init);
|
|
|
|
register_dissector("q931", dissect_q931, proto_q931);
|
|
q931_tpkt_pdu_handle = create_dissector_handle(dissect_q931_tpkt_pdu,
|
|
proto_q931);
|
|
register_dissector("q931.ie", dissect_q931_ie_cs0, proto_q931);
|
|
register_dissector("q931.ie.cs7", dissect_q931_ie_cs7, proto_q931);
|
|
|
|
/* subdissector code */
|
|
codeset_dissector_table = register_dissector_table("q931.codeset", "Q.931 Codeset", FT_UINT8, BASE_HEX);
|
|
ie_dissector_table = register_dissector_table("q931.ie", "Q.931 IE", FT_UINT16, BASE_HEX);
|
|
|
|
q931_module = prefs_register_protocol(proto_q931, NULL);
|
|
prefs_register_bool_preference(q931_module, "desegment_h323_messages",
|
|
"Reassemble Q.931 messages spanning multiple TCP segments",
|
|
"Whether the Q.931 dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&q931_desegment);
|
|
prefs_register_bool_preference(q931_module, "reassembly",
|
|
"Reassemble segmented Q.931 messages",
|
|
"Reassemble segmented Q.931 messages (Q.931 - Annex H)",
|
|
&q931_reassembly);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_q931(void)
|
|
{
|
|
dissector_handle_t q931_handle;
|
|
|
|
q931_handle = find_dissector("q931");
|
|
dissector_add("lapd.sapi", LAPD_SAPI_Q931, q931_handle);
|
|
|
|
/*
|
|
* Attempt to get a handle for the H.225 dissector.
|
|
* If we can't, the handle we get is null, and we'll just
|
|
* dissect putatively-H.255 Call Signaling stuff as User
|
|
* Information.
|
|
*/
|
|
h225_handle = find_dissector("h225");
|
|
|
|
/*
|
|
* For H.323.
|
|
*/
|
|
heur_dissector_add("tcp", dissect_q931_tpkt, proto_q931);
|
|
}
|