--- /dev/null
+/* packet-q933.c
+ * Routines for Q.933 frame disassembly
+ * Guy Harris <guy@alum.mit.edu>
+ *
+ * $Id: packet-q933.c,v 1.1 2003/09/03 05:39:21 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <glib.h>
+#include <string.h>
+#include <epan/packet.h>
+#include <epan/strutil.h>
+#include "nlpid.h"
+#include "prefs.h"
+
+#include "packet-tpkt.h"
+
+static int proto_q933 = -1;
+static int hf_q933_discriminator = -1;
+static int hf_q933_call_ref_len = -1;
+static int hf_q933_call_ref_flag = -1;
+static int hf_q933_call_ref = -1;
+static int hf_q933_message_type = -1;
+static int hf_q933_cause_value = -1;
+static int hf_q933_calling_party_number = -1;
+static int hf_q933_called_party_number = -1;
+static int hf_q933_connected_number = -1;
+static int hf_q933_redirecting_number = -1;
+
+static gint ett_q933 = -1;
+static gint ett_q933_ie = -1;
+
+/*
+ * Q.933 message types.
+ */
+#define Q933_ESCAPE 0x00
+#define Q933_ALERTING 0x01
+#define Q933_CALL_PROCEEDING 0x02
+#define Q933_CONNECT 0x07
+#define Q933_CONNECT_ACK 0x0F
+#define Q933_PROGRESS 0x03
+#define Q933_SETUP 0x05
+#define Q933_DISCONNECT 0x45
+#define Q933_RELEASE 0x4D
+#define Q933_RELEASE_COMPLETE 0x5A
+#define Q933_SEGMENT 0x60
+#define Q933_STATUS 0x7D
+#define Q933_STATUS_ENQUIRY 0x75
+
+static const value_string q933_message_type_vals[] = {
+ { Q933_ESCAPE, "ESCAPE" },
+ { Q933_ALERTING, "ALERTING" },
+ { Q933_CALL_PROCEEDING, "CALL PROCEEDING" },
+ { Q933_CONNECT, "CONNECT" },
+ { Q933_CONNECT_ACK, "CONNECT ACKNOWLEDGE" },
+ { Q933_PROGRESS, "PROGRESS" },
+ { Q933_SETUP, "SETUP" },
+ { Q933_DISCONNECT, "DISCONNECT" },
+ { Q933_RELEASE, "RELEASE" },
+ { Q933_RELEASE_COMPLETE, "RELEASE COMPLETE" },
+ { Q933_SEGMENT, "SEGMENT" },
+ { Q933_STATUS, "STATUS" },
+ { Q933_STATUS_ENQUIRY, "STATUS ENQUIRY" },
+ { 0, NULL }
+};
+
+static const true_false_string tfs_call_ref_flag = {
+ "Message sent to originating side",
+ "Message sent from originating side"
+};
+
+/*
+ * Information elements.
+ */
+
+/* Shifted codeset values */
+#define CS0 0x000
+#define CS1 0x100
+#define CS2 0x200
+#define CS3 0x300
+#define CS4 0x400
+#define CS5 0x500
+#define CS6 0x600
+#define CS7 0x700
+
+#define Q933_IE_SO_MASK 0x80 /* single-octet/variable-length mask */
+/*
+ * Single-octet IEs.
+ */
+#define Q933_IE_SO_IDENTIFIER_MASK 0xf0 /* IE identifier mask */
+#define Q933_IE_SO_IDENTIFIER_SHIFT 4 /* IE identifier shift */
+#define Q933_IE_SO_IE_MASK 0x0F /* IE mask */
+
+#define Q933_IE_SHIFT 0x90
+#define Q933_IE_SHIFT_NON_LOCKING 0x08 /* non-locking shift */
+#define Q933_IE_SHIFT_CODESET 0x0F /* codeset */
+
+#define Q933_IE_REPEAT_INDICATOR 0xD0
+
+/*
+ * Variable-length IEs.
+ */
+#define Q933_IE_VL_EXTENSION 0x80 /* Extension flag */
+
+/*
+ * Codeset 0 (default).
+ */
+#define Q933_IE_SEGMENTED_MESSAGE 0x00
+#define Q933_IE_BEARER_CAPABILITY 0x04
+#define Q933_IE_CAUSE 0x08
+#define Q933_IE_CALL_STATE 0x14
+#define Q933_IE_CHANNEL_IDENTIFICATION 0x18
+#define Q933_IE_DLCI 0x19
+#define Q933_IE_PROGRESS_INDICATOR 0x1E
+#define Q933_IE_NETWORK_SPECIFIC_FACIL 0x20 /* Network Specific Facilities */
+#define Q933_IE_DISPLAY 0x28
+#define Q933_IE_E2E_TRANSIT_DELAY 0x42 /* End-to-end Transit Delay */
+#define Q933_IE_TD_SELECTION_AND_INT 0x43 /* Transit Delay Selection and Indication */
+#define Q933_IE_PL_BINARY_PARAMETERS 0x44 /* Packet layer binary parameters */
+#define Q933_IE_LL_CORE_PARAMETERS 0x48 /* Link layer core parameters */
+#define Q933_IE_LL_PROTOCOL_PARAMETERS 0x49 /* Link layer protocol parameters */
+#define Q933_IE_REVERSE_CHARGE_IND 0x4A /* Reverse charging indication */
+#define Q933_IE_CONNECTED_NUMBER 0x4C /* Connected Number */
+#define Q933_IE_CONNECTED_SUBADDR 0x4D /* Connected sub-address */
+#define Q933_IE_X_213_PRIORITY 0x50 /* X.213 priority */
+#define Q933_IE_REPORT_TYPE 0x51
+#define Q933_IE_LINK_INTEGRITY_VERF 0x53 /* Link integrity verification */
+#define Q933_IE_PVC_STATUS 0x57
+#define Q933_IE_CALLING_PARTY_NUMBER 0x6C /* Calling Party Number */
+#define Q933_IE_CALLING_PARTY_SUBADDR 0x6D /* Calling Party Subaddress */
+#define Q933_IE_CALLED_PARTY_NUMBER 0x70 /* Called Party Number */
+#define Q933_IE_CALLED_PARTY_SUBADDR 0x71 /* Called Party Subaddress */
+#define Q933_IE_TRANSIT_NETWORK_SEL 0x78 /* Transit Network Selection */
+#define Q933_IE_LOW_LAYER_COMPAT 0x7C /* Low-Layer Compatibility */
+#define Q933_IE_HIGH_LAYER_COMPAT 0x7D /* High-Layer Compatibility */
+#define Q933_IE_USER_USER 0x7E /* User-User */
+#define Q933_IE_ESCAPE 0x7F /* Escape for extension */
+
+/* Codeset 0 */
+static const value_string q933_info_element_vals0[] = {
+ { Q933_IE_SEGMENTED_MESSAGE, "Segmented message" },
+ { Q933_IE_BEARER_CAPABILITY, "Bearer capability" },
+ { Q933_IE_CAUSE, "Cause" },
+ { Q933_IE_CALL_STATE, "Call state" },
+ { Q933_IE_CHANNEL_IDENTIFICATION, "Channel identification" },
+ { Q933_IE_DLCI, "Data link connection identifier" },
+ { Q933_IE_PROGRESS_INDICATOR, "Progress indicator" },
+ { Q933_IE_NETWORK_SPECIFIC_FACIL, "Network specific facilities" },
+ { Q933_IE_E2E_TRANSIT_DELAY, "End-to-end transit delay" },
+ { Q933_IE_TD_SELECTION_AND_INT, "Transit delay selection and indication" },
+ { Q933_IE_PL_BINARY_PARAMETERS, "Packet layer binary parameters" },
+ { Q933_IE_LL_CORE_PARAMETERS, "Link layer core parameters" },
+ { Q933_IE_LL_PROTOCOL_PARAMETERS, "Link layer protocol parameters" },
+ { Q933_IE_REVERSE_CHARGE_IND, "Reverse charging indication" },
+ { Q933_IE_CONNECTED_NUMBER, "Connected number" },
+ { Q933_IE_CONNECTED_SUBADDR, "Connected subaddress" },
+ { Q933_IE_X_213_PRIORITY, "X.213 priority" },
+ { Q933_IE_REPORT_TYPE, "Report type" },
+ { Q933_IE_LINK_INTEGRITY_VERF, "Link integrity verification" },
+ { Q933_IE_PVC_STATUS, "PVC status" },
+ { Q933_IE_CALLING_PARTY_NUMBER, "Calling party number" },
+ { Q933_IE_CALLING_PARTY_SUBADDR, "Calling party subaddress" },
+ { Q933_IE_CALLED_PARTY_NUMBER, "Called party number" },
+ { Q933_IE_CALLED_PARTY_SUBADDR, "Called party subaddress" },
+ { Q933_IE_TRANSIT_NETWORK_SEL, "Transit network selection" },
+ { Q933_IE_LOW_LAYER_COMPAT, "Low-layer compatibility" },
+ { Q933_IE_HIGH_LAYER_COMPAT, "High-layer compatibility" },
+ { Q933_IE_USER_USER, "User-user" },
+ { Q933_IE_ESCAPE, "Escape" },
+ { 0, NULL }
+};
+/* Codeset 1 */
+static const value_string q933_info_element_vals1[] = {
+ { 0, NULL }
+};
+/* Codeset 2 */
+static const value_string q933_info_element_vals2[] = {
+ { 0, NULL }
+};
+/* Codeset 3 */
+static const value_string q933_info_element_vals3[] = {
+ { 0, NULL }
+};
+/* Codeset 4 */
+static const value_string q933_info_element_vals4[] = {
+ { 0, NULL }
+};
+/* Codeset 5 */
+static const value_string q933_info_element_vals5[] = {
+ { 0, NULL }
+};
+/* Codeset 6 */
+static const value_string q933_info_element_vals6[] = {
+ { 0, NULL }
+};
+/* Codeset 7 */
+static const value_string q933_info_element_vals7[] = {
+ { 0, NULL }
+};
+
+/* Codeset array */
+static const value_string *q933_info_element_vals[] = {
+ q933_info_element_vals0,
+ q933_info_element_vals1,
+ q933_info_element_vals2,
+ q933_info_element_vals3,
+ q933_info_element_vals4,
+ q933_info_element_vals5,
+ q933_info_element_vals6,
+ q933_info_element_vals7,
+};
+
+static const value_string q933_congestion_level_vals[] = {
+ { 0x0, "Receiver ready" },
+ { 0xF, "Receiver not ready" },
+ { 0, NULL }
+};
+
+static const value_string q933_repeat_indication_vals[] = {
+ { 0x2, "Prioritized list" },
+ { 0, NULL }
+};
+
+/*
+ * ITU-standardized coding.
+ */
+#define Q933_ITU_STANDARDIZED_CODING 0x00
+
+/*
+ * Dissect a Segmented message information element.
+ */
+static void
+dissect_q933_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\n", 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_text(tree, tvb, offset + 1, 1,
+ "Segmented message type: %u\n", tvb_get_guint8(tvb, offset + 1));
+}
+
+/*
+ * Dissect a Bearer capability or Low-layer compatibility information element.
+ */
+static const value_string q933_bc_coding_standard_vals[] = {
+ { 0x00, "ITU-T standardized coding" },
+ { 0x20, "ISO/IEC standard" },
+ { 0x40, "National standard" },
+ { 0x60, "Standard defined for this particular network" },
+ { 0, NULL }
+};
+
+static const value_string q933_information_transfer_capability_vals[] = {
+ { 0x08, "Unrestricted digital information" },
+ { 0, NULL }
+};
+
+static const value_string q933_transfer_mode_vals[] = {
+ { 0x20, "Frame mode" },
+ { 0, NULL }
+};
+
+#define Q933_IT_RATE_MULTIRATE 0x18
+
+static const value_string q933_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" },
+ { Q933_IT_RATE_MULTIRATE, "Multirate (64 kbit/s base rate)" },
+ { 0, NULL }
+};
+
+static const value_string q933_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 q933_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 q933_l1_intermediate_rate_vals[] = {
+ { 0x20, "8 kbit/s" },
+ { 0x40, "16 kbit/s" },
+ { 0x60, "32 kbit/s" },
+ { 0, NULL }
+};
+
+static const value_string q933_l1_stop_bits_vals[] = {
+ { 0x20, "1" },
+ { 0x40, "1.5" },
+ { 0x60, "2" },
+ { 0, NULL }
+};
+
+static const value_string q933_l1_data_bits_vals[] = {
+ { 0x08, "5" },
+ { 0x10, "7" },
+ { 0x18, "8" },
+ { 0, NULL }
+};
+
+static const value_string q933_l1_parity_vals[] = {
+ { 0x00, "Odd" },
+ { 0x02, "Even" },
+ { 0x03, "None" },
+ { 0x04, "Forced to 0" },
+ { 0x05, "Forced to 1" },
+ { 0, NULL }
+};
+
+static const value_string q933_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 Q933_UIL2_USER_SPEC 0x10
+
+static const value_string q933_uil2_vals[] = {
+ { 0x01, "Basic mode ISO 1745" },
+ { 0x06, "X.25, link level" },
+ { 0x07, "X.25 multilink" },
+ { 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" },
+ { Q933_UIL2_USER_SPEC, "User-specified" },
+ { 0x11, "ISO 7776 DTE-DTE operation" },
+ { 0, NULL }
+};
+
+static const value_string q933_address_inclusion_vals[] = {
+ { 0x01, "Address included" },
+ { 0x02, "Encapsulation of logical control frame" },
+ { 0, NULL }
+};
+
+static const value_string q933_mode_vals[] = {
+ { 0x20, "Normal mode" },
+ { 0x40, "Extended mode" },
+ { 0, NULL }
+};
+
+#define Q933_UIL3_X25_PL 0x06
+#define Q933_UIL3_ISO_8208 0x07 /* X.25-based */
+#define Q933_UIL3_X223 0x08 /* X.25-based */
+#define Q933_UIL3_TR_9577 0x0B
+#define Q933_UIL3_USER_SPEC 0x10
+
+static const value_string q933_uil3_vals[] = {
+ { Q933_UIL3_X25_PL, "X.25, packet layer" },
+ { Q933_UIL3_ISO_8208, "ISO/IEC 8208" },
+ { Q933_UIL3_X223, "X.223/ISO 8878" },
+ { 0x09, "ISO/IEC 8473" },
+ { 0x0A, "T.70" },
+ { Q933_UIL3_TR_9577, "ISO/IEC TR 9577" },
+ { Q933_UIL3_USER_SPEC, "User-specified" },
+ { 0, NULL }
+};
+
+static void
+dissect_q933_protocol_discriminator(tvbuff_t *tvb, int offset, proto_tree *tree)
+{
+ unsigned int discriminator = tvb_get_guint8(tvb, offset);
+
+ if (discriminator == NLPID_Q_933) {
+ proto_tree_add_uint_format(tree, hf_q933_discriminator,
+ tvb, offset, 1, discriminator,
+ "Protocol discriminator: Q.933");
+ } else if (discriminator == NLPID_Q_2931) {
+ proto_tree_add_uint_format(tree, hf_q933_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_q933_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_q933_discriminator,
+ tvb, offset, 1, discriminator,
+ "Protocol discriminator: National use (0x%02X)",
+ discriminator);
+ } else {
+ proto_tree_add_uint_format(tree, hf_q933_discriminator,
+ tvb, offset, 1, discriminator,
+ "Protocol discriminator: Reserved (0x%02X)",
+ discriminator);
+ }
+}
+
+void
+dissect_q933_bearer_capability_ie(tvbuff_t *tvb, int offset, int len,
+ proto_tree *tree)
+{
+ guint8 octet;
+ guint8 coding_standard;
+ 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;
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_bc_coding_standard_vals, NULL));
+ if (coding_standard != Q933_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));
+ return;
+ }
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Information transfer capability: %s",
+ val_to_str(octet & 0x1F, q933_information_transfer_capability_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ /*
+ * XXX - only in Low-layer compatibility information element.
+ */
+ if (!(octet & Q933_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_text(tree, tvb, offset, 1,
+ "Transfer mode: %s",
+ val_to_str(octet & 0x60, q933_transfer_mode_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ if ((octet & 0x60) == 0x20) {
+ /*
+ * Layer 1 information.
+ */
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "User information layer 1 protocol: %s",
+ val_to_str(octet & 0x1F, q933_uil1_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (octet & Q933_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,
+ "User rate: %s",
+ val_to_str(octet & 0x1F, q933_l1_user_rate_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (octet & Q933_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");
+ offset += 1;
+ len -= 1;
+
+ if (octet & Q933_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, q933_l1_stop_bits_vals,
+ "Unknown (0x%X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Data bits: %s",
+ val_to_str(octet & 0x18, q933_l1_data_bits_vals,
+ "Unknown (0x%X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Parity: %s",
+ val_to_str(octet & 0x07, q933_l1_parity_vals,
+ "Unknown (0x%X)"));
+
+ if (octet & Q933_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;
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Modem type: Network-specific rules 0x%02X", modem_type);
+ 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, q933_uil2_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ /*
+ * XXX - only in Low-layer compatibility information element.
+ */
+ if (octet & Q933_IE_VL_EXTENSION)
+ goto l2_done;
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ if (uil2_protocol == Q933_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,
+ "Address inclusion: %s",
+ val_to_str(octet & 0x03, q933_address_inclusion_vals,
+ "Unknown (0x%02X)"));
+ }
+ 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, q933_uil3_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+
+ /*
+ * XXX - only in Low-layer compatibility information element.
+ */
+ if (octet & Q933_IE_VL_EXTENSION)
+ goto l3_done;
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ switch (uil3_protocol) {
+
+ case Q933_UIL3_X25_PL:
+ case Q933_UIL3_ISO_8208:
+ case Q933_UIL3_X223:
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Mode: %s",
+ val_to_str(octet & 0x60, q933_mode_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (octet & Q933_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 & Q933_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 Q933_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 Q933_UIL3_TR_9577:
+ add_l3_info = (octet & 0x0F) << 4;
+ if (octet & Q933_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.
+ */
+static const value_string q933_cause_coding_standard_vals[] = {
+ { 0x00, "ITU-T standardized coding" },
+ { 0x20, "ISO/IEC standard" },
+ { 0x40, "National standard" },
+ { 0x60, "Standard specific to identified location" },
+ { 0, NULL }
+};
+
+const value_string q933_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 q933_cause_recommendation_vals[] = {
+ { 0x00, "Q.933" },
+ { 0x03, "X.21" },
+ { 0x04, "X.25" },
+ { 0x05, "Q.1031/Q.1051" },
+ { 0, NULL }
+};
+
+/*
+ * Cause codes for Cause.
+ */
+#define Q933_CAUSE_UNALLOC_NUMBER 0x01
+#define Q933_CAUSE_NO_ROUTE_TO_DEST 0x03
+#define Q933_CAUSE_CALL_REJECTED 0x15
+#define Q933_CAUSE_NUMBER_CHANGED 0x16
+#define Q933_CAUSE_ACCESS_INFO_DISC 0x2B
+#define Q933_CAUSE_QOS_UNAVAILABLE 0x31
+#define Q933_CAUSE_CHAN_NONEXISTENT 0x52
+#define Q933_CAUSE_INCOMPATIBLE_DEST 0x58
+#define Q933_CAUSE_MAND_IE_MISSING 0x60
+#define Q933_CAUSE_MT_NONEX_OR_UNIMPL 0x61
+#define Q933_CAUSE_IE_NONEX_OR_UNIMPL 0x63
+#define Q933_CAUSE_INVALID_IE_CONTENTS 0x64
+#define Q933_CAUSE_MSG_INCOMPAT_W_CS 0x65
+#define Q933_CAUSE_REC_TIMER_EXP 0x66
+
+const value_string q933_cause_code_vals[] = {
+ { 0x00, "Valid cause code not yet received" },
+ { Q933_CAUSE_UNALLOC_NUMBER, "Unallocated (unassigned) number" },
+ { 0x02, "No route to specified transit network" },
+ { Q933_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" },
+ { Q933_CAUSE_CALL_REJECTED, "Call rejected" },
+ { Q933_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" },
+ { Q933_CAUSE_ACCESS_INFO_DISC, "Access information discarded" },
+ { 0x2C, "Requested circuit/channel not available" },
+ { 0x2D, "Pre-empted" },
+ { 0x2E, "Precedence call blocked" },
+ { 0x2F, "Resources unavailable, unspecified" },
+ { Q933_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" },
+ { Q933_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" },
+ { Q933_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" },
+ { Q933_CAUSE_MAND_IE_MISSING, "Mandatory information element is missing" },
+ { Q933_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" },
+ { Q933_CAUSE_IE_NONEX_OR_UNIMPL,"Information element nonexistant or not implemented" },
+ { Q933_CAUSE_INVALID_IE_CONTENTS,"Invalid information element contents" },
+ { Q933_CAUSE_MSG_INCOMPAT_W_CS, "Message not compatible with call state" },
+ { Q933_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 q933_cause_condition_vals[] = {
+ { 0x00, "Unknown" },
+ { 0x01, "Permanent" },
+ { 0x02, "Transient" },
+ { 0x00, NULL }
+};
+
+#define Q933_REJ_USER_SPECIFIC 0x00
+#define Q933_REJ_IE_MISSING 0x04
+#define Q933_REJ_IE_INSUFFICIENT 0x08
+
+static const value_string q933_rejection_reason_vals[] = {
+ { 0x00, "User specific" },
+ { 0x04, "Information element missing" },
+ { 0x08, "Information element contents are not sufficient" },
+ { 0x00, NULL }
+};
+
+void
+dissect_q933_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;
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_cause_coding_standard_vals, NULL));
+ if (coding_standard != Q933_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_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, q933_cause_location_vals,
+ "Unknown (0x%X)"));
+ offset += 1;
+ len -= 1;
+
+ if (!(octet & Q933_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, q933_cause_recommendation_vals,
+ "Unknown (0x%02X)"));
+ 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, 0, 1, cause_value);
+ offset += 1;
+ len -= 1;
+
+ if (len == 0)
+ return;
+ switch (cause_value) {
+
+ case Q933_CAUSE_UNALLOC_NUMBER:
+ case Q933_CAUSE_NO_ROUTE_TO_DEST:
+ case Q933_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, q933_cause_condition_vals,
+ "Unknown (0x%X)"));
+ break;
+
+ case Q933_CAUSE_CALL_REJECTED:
+ rejection_reason = octet & 0x7C;
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Rejection reason: %s",
+ val_to_str(octet & 0x7C, q933_rejection_reason_vals,
+ "Unknown (0x%X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Condition: %s",
+ val_to_str(octet & 0x03, q933_cause_condition_vals,
+ "Unknown (0x%X)"));
+ offset += 1;
+ len -= 1;
+
+ if (len == 0)
+ return;
+ switch (rejection_reason) {
+
+ case Q933_REJ_USER_SPECIFIC:
+ proto_tree_add_text(tree, tvb, offset, len,
+ "User specific diagnostic: %s",
+ tvb_bytes_to_str(tvb, offset, len));
+ break;
+
+ case Q933_REJ_IE_MISSING:
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Missing information element: %s",
+ val_to_str(tvb_get_guint8(tvb, offset), q933_info_element_vals0,
+ "Unknown (0x%02X)"));
+ break;
+
+ case Q933_REJ_IE_INSUFFICIENT:
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Insufficient information element: %s",
+ val_to_str(tvb_get_guint8(tvb, offset), q933_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 Q933_CAUSE_ACCESS_INFO_DISC:
+ case Q933_CAUSE_INCOMPATIBLE_DEST:
+ case Q933_CAUSE_MAND_IE_MISSING:
+ case Q933_CAUSE_IE_NONEX_OR_UNIMPL:
+ case Q933_CAUSE_INVALID_IE_CONTENTS:
+ do {
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Information element: %s",
+ val_to_str(tvb_get_guint8(tvb, offset), q933_info_element_vals0,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+ } while (len != 0);
+ break;
+
+ case Q933_CAUSE_MT_NONEX_OR_UNIMPL:
+ case Q933_CAUSE_MSG_INCOMPAT_W_CS:
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Message type: %s",
+ val_to_str(tvb_get_guint8(tvb, offset), q933_message_type_vals,
+ "Unknown (0x%02X)"));
+ break;
+
+ case Q933_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 q933_coding_standard_vals[] = {
+ { 0x00, "ITU-T standardized coding" },
+ { 0x20, "ISO/IEC standard" },
+ { 0x40, "National standard" },
+ { 0x60, "Standard defined for the network" },
+ { 0, NULL }
+};
+
+static const value_string q933_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_q933_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_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_coding_standard_vals, NULL));
+ if (coding_standard != Q933_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, q933_call_state_vals,
+ "Unknown (0x%02X)"));
+}
+
+/*
+ * Dissect a Channel identification information element.
+ */
+#define Q933_INTERFACE_IDENTIFIED 0x40
+#define Q933_NOT_BASIC_CHANNEL 0x20
+
+static const value_string q933_basic_channel_selection_vals[] = {
+ { 0x00, "No channel" },
+ { 0x01, "B1 channel" },
+ { 0x02, "B2 channel" },
+ { 0x03, "Any channel" },
+ { 0, NULL }
+};
+
+static const value_string q933_not_basic_channel_selection_vals[] = {
+ { 0x00, "No channel" },
+ { 0x01, "Channel indicated in following octets" },
+ { 0x03, "Any channel" },
+ { 0, NULL }
+};
+
+#define Q933_IS_SLOT_MAP 0x10
+
+static const value_string q933_element_type_vals[] = {
+ { 0x03, "B-channel units" },
+ { 0x06, "H0-channel units" },
+ { 0x08, "H11-channel units" },
+ { 0x09, "H12-channel units" },
+ { 0, NULL }
+};
+
+static void
+dissect_q933_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 & Q933_INTERFACE_IDENTIFIED) ? "explicitly" : "implicitly");
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "%s interface",
+ (octet & Q933_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 & Q933_NOT_BASIC_CHANNEL) {
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Channel selection: %s",
+ val_to_str(octet & 0x03, q933_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, q933_basic_channel_selection_vals,
+ NULL));
+ }
+ offset += 1;
+ len -= 1;
+
+ if (octet & Q933_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 & Q933_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 & Q933_NOT_BASIC_CHANNEL) {
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ coding_standard = octet & 0x60;
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_coding_standard_vals,
+ NULL));
+ if (coding_standard != Q933_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 & Q933_IS_SLOT_MAP) ? "slot map" : "number");
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "%s type: %s",
+ (octet & Q933_IS_SLOT_MAP) ? "Map element" : "Channel",
+ val_to_str(octet & 0x0F, q933_element_type_vals,
+ "Unknown (0x%02X)"));
+
+ /*
+ * XXX - dump the channel number or slot map.
+ */
+ }
+}
+
+/*
+ * Dissect a Progress indicator information element.
+ */
+static const value_string q933_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_q933_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_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_cause_coding_standard_vals, NULL));
+ if (coding_standard != Q933_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, q933_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, q933_progress_description_vals,
+ "Unknown (0x%02X)"));
+}
+
+/*
+ * Dissect a Network-specific facilities or Transit network selection
+ * information element.
+ */
+static const value_string q933_netid_type_vals[] = {
+ { 0x00, "User specified" },
+ { 0x20, "National network identification" },
+ { 0x30, "International network identification" },
+ { 0, NULL }
+};
+
+static const value_string q933_netid_plan_vals[] = {
+ { 0x00, "Unknown" },
+ { 0x01, "Carrier Identification Code" },
+ { 0x03, "X.121 data network identification code" },
+ { 0, NULL }
+};
+
+static void
+dissect_q933_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, q933_netid_type_vals,
+ "Unknown (0x%02X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Network identification plan: %s",
+ val_to_str(octet & 0x0F, q933_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));
+}
+
+static int
+dissect_q933_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 & Q933_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 & Q933_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 & Q933_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_q933_e2e_transit_delay_ie(tvbuff_t *tvb, int offset, int len,
+ proto_tree *tree)
+{
+ int value_len;
+
+ if (len == 0)
+ return;
+ value_len = dissect_q933_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_q933_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_q933_guint16_value(tvb, offset, len, tree,
+ "Maximum end-to-end transit delay");
+}
+
+/*
+ * Dissect a Transit delay selection and indication information element.
+ */
+static void
+dissect_q933_td_selection_and_int_ie(tvbuff_t *tvb, int offset, int len,
+ proto_tree *tree)
+{
+ if (len == 0)
+ return;
+ dissect_q933_guint16_value(tvb, offset, len, tree,
+ "Transit delay");
+}
+
+static void
+dissect_q933_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,
+ "%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");
+}
+
+/*
+ * Dissect a Reverse charging indication information element.
+ */
+static const value_string q933_reverse_charging_indication_vals[] = {
+ { 0x01, "Reverse charging requested" },
+ { 0, NULL }
+};
+
+static void
+dissect_q933_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,
+ q933_reverse_charging_indication_vals, "Unknown (0x%02X)"));
+}
+
+/*
+ * Dissect a (phone) number information element.
+ */
+static const value_string q933_number_type_vals[] = {
+ { 0x00, "Unknown" },
+ { 0x10, "International number" },
+ { 0x20, "National number" },
+ { 0x30, "Network specific number" },
+ { 0x40, "Subscriber number" },
+ { 0x60, "Abbreviated number" },
+ { 0, NULL }
+};
+
+static const value_string q933_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 q933_presentation_indicator_vals[] = {
+ { 0x00, "Presentation allowed" },
+ { 0x20, "Presentation restricted" },
+ { 0x40, "Number not available due to interworking" },
+ { 0, NULL }
+};
+
+static const value_string q933_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 q933_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_q933_number_ie(tvbuff_t *tvb, int offset, int len,
+ proto_tree *tree, int hfindex)
+{
+ guint8 octet;
+
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Type of number: %s",
+ val_to_str(octet & 0x70, q933_number_type_vals,
+ "Unknown (0x%02X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Numbering plan: %s",
+ val_to_str(octet & 0x0F, q933_numbering_plan_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (!(octet & Q933_IE_VL_EXTENSION)) {
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Presentation indicator: %s",
+ val_to_str(octet & 0x60, q933_presentation_indicator_vals,
+ "Unknown (0x%X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Screening indicator: %s",
+ val_to_str(octet & 0x03, q933_screening_indicator_vals,
+ "Unknown (0x%X)"));
+ offset += 1;
+ len -= 1;
+ }
+
+ /*
+ * XXX - only in a Redirecting number information element.
+ */
+ if (!(octet & Q933_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, q933_redirection_reason_vals,
+ "Unknown (0x%X)"));
+ offset += 1;
+ len -= 1;
+ }
+
+ if (len == 0)
+ return;
+ proto_tree_add_item(tree, hfindex, tvb, offset, len, FALSE);
+}
+
+/*
+ * Dissect a party subaddress information element.
+ */
+static const value_string q933_subaddress_type_vals[] = {
+ { 0x00, "X.213/ISO 8348 Add.2 NSAP" },
+ { 0x20, "User-specified" },
+ { 0, NULL }
+};
+
+static const value_string q933_odd_even_indicator_vals[] = {
+ { 0x00, "Even number of address signals" },
+ { 0x10, "Odd number of address signals" },
+ { 0, NULL }
+};
+
+static void
+dissect_q933_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, q933_subaddress_type_vals,
+ "Unknown (0x%02X)"));
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Odd/even indicator: %s",
+ val_to_str(octet & 0x10, q933_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 High-layer compatibility information element.
+ */
+#define Q933_AUDIOVISUAL 0x60
+static const value_string q933_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" },
+ { Q933_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 q933_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_q933_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_text(tree, tvb, offset, 1,
+ "Coding standard: %s",
+ val_to_str(coding_standard, q933_coding_standard_vals, NULL));
+ offset += 1;
+ len -= 1;
+ if (coding_standard != Q933_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, q933_high_layer_characteristics_vals,
+ "Unknown (0x%02X)"));
+ offset += 1;
+ len -= 1;
+
+ if (!(octet & Q933_IE_VL_EXTENSION)) {
+ if (len == 0)
+ return;
+ octet = tvb_get_guint8(tvb, offset);
+ if (characteristics == Q933_AUDIOVISUAL) {
+ proto_tree_add_text(tree, tvb, offset, 1,
+ "Extended audiovisual characteristics identification: %s",
+ val_to_str(octet & 0x7F,
+ q933_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,
+ q933_high_layer_characteristics_vals,
+ "Unknown (0x%02X)"));
+ }
+ }
+}
+
+
+/*
+ * Dissect a User-user information element.
+ */
+#define Q933_PROTOCOL_DISCRIMINATOR_IA5 0x04
+#define Q933_PROTOCOL_DISCRIMINATOR_ASN1 0x05
+
+static const value_string q933_protocol_discriminator_vals[] = {
+ { 0x00, "User-specific protocol" },
+ { 0x01, "OSI high layer protocols" },
+ { 0x02, "X.244" },
+ { Q933_PROTOCOL_DISCRIMINATOR_IA5, "IA5 characters" },
+ { Q933_PROTOCOL_DISCRIMINATOR_ASN1, "X.208 and X.209 coded user information" },
+ { 0x07, "V.120 rate adaption" },
+ { 0x08, "Q.933/I.451 user-network call control messages" },
+ { 0, NULL }
+};
+
+void
+dissect_q933_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, q933_protocol_discriminator_vals,
+ "Unknown (0x%02x)"));
+ offset += 1;
+ len -= 1;
+
+ if (len == 0)
+ return;
+ switch (octet) {
+
+ case Q933_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_q933_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));
+ }
+}
+
+static const value_string q933_codeset_vals[] = {
+ { 0x00, "Q.933 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_q933(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ int offset = 0;
+ proto_tree *q933_tree = NULL;
+ proto_item *ti;
+ proto_tree *ie_tree = NULL;
+ guint8 call_ref_len;
+ guint8 call_ref[15];
+ guint8 message_type;
+ guint8 info_element;
+ guint16 info_element_len;
+ int codeset, locked_codeset;
+ gboolean non_locking_shift;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "Q.933");
+
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_q933, tvb, offset, -1,
+ FALSE);
+ q933_tree = proto_item_add_subtree(ti, ett_q933);
+
+ dissect_q933_protocol_discriminator(tvb, offset, q933_tree);
+ }
+ offset += 1;
+ call_ref_len = tvb_get_guint8(tvb, offset) & 0xF; /* XXX - do as a bit field? */
+ if (q933_tree != NULL)
+ proto_tree_add_uint(q933_tree, hf_q933_call_ref_len, tvb, offset, 1, call_ref_len);
+ offset += 1;
+ if (call_ref_len != 0) {
+ tvb_memcpy(tvb, call_ref, offset, call_ref_len);
+ if (q933_tree != NULL) {
+ proto_tree_add_boolean(q933_tree, hf_q933_call_ref_flag,
+ tvb, offset, 1, (call_ref[0] & 0x80) != 0);
+ call_ref[0] &= 0x7F;
+ proto_tree_add_bytes(q933_tree, hf_q933_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, q933_message_type_vals,
+ "Unknown message type (0x%02X)"));
+ }
+ if (q933_tree != NULL)
+ proto_tree_add_uint(q933_tree, hf_q933_message_type, tvb, offset, 1, message_type);
+ offset += 1;
+
+ /*
+ * And now for the information elements....
+ */
+ codeset = locked_codeset = 0; /* start out in codeset 0 */
+ non_locking_shift = TRUE;
+ while (tvb_reported_length_remaining(tvb, offset) > 0) {
+ info_element = tvb_get_guint8(tvb, offset);
+
+ /* Check for the codeset shift */
+ if ((info_element & Q933_IE_SO_MASK) &&
+ ((info_element & Q933_IE_SO_IDENTIFIER_MASK) == Q933_IE_SHIFT)) {
+ non_locking_shift = info_element & Q933_IE_SHIFT_NON_LOCKING;
+ codeset = info_element & Q933_IE_SHIFT_CODESET;
+ if (!non_locking_shift)
+ locked_codeset = codeset;
+ if (q933_tree != NULL) {
+ proto_tree_add_text(q933_tree, tvb, offset, 1,
+ "%s shift to codeset %u: %s",
+ (non_locking_shift ? "Non-locking" : "Locking"),
+ codeset,
+ val_to_str(codeset, q933_codeset_vals,
+ "Unknown (0x%02X)"));
+ }
+ offset += 1;
+ continue;
+ }
+
+ /*
+ * Check for the single-octet IEs.
+ */
+ if (info_element & Q933_IE_SO_MASK) {
+ switch ((codeset << 8) | (info_element & Q933_IE_SO_IDENTIFIER_MASK)) {
+
+ case CS0 | Q933_IE_REPEAT_INDICATOR:
+ if (q933_tree != NULL) {
+ proto_tree_add_text(q933_tree, tvb, offset, 1,
+ "Repeat indicator: %s",
+ val_to_str(info_element & Q933_IE_SO_IE_MASK,
+ q933_repeat_indication_vals,
+ "Unknown (0x%X)"));
+ }
+ break;
+
+ default:
+ if (q933_tree != NULL) {
+ proto_tree_add_text(q933_tree, tvb, offset, 1,
+ "Unknown information element (0x%02X)",
+ info_element);
+ }
+ break;
+ }
+ offset += 1;
+ codeset = locked_codeset;
+ continue;
+ }
+
+ /*
+ * Variable-length IE.
+ */
+ info_element_len = tvb_get_guint8(tvb, offset + 1);
+ if (q933_tree != NULL) {
+ ti = proto_tree_add_text(q933_tree, tvb, offset,
+ 1+1+info_element_len, "%s",
+ val_to_str(info_element, q933_info_element_vals[codeset],
+ "Unknown information element (0x%02X)"));
+ ie_tree = proto_item_add_subtree(ti, ett_q933_ie);
+ proto_tree_add_text(ie_tree, tvb, offset, 1,
+ "Information element: %s",
+ val_to_str(info_element, q933_info_element_vals[codeset],
+ "Unknown (0x%02X)"));
+ proto_tree_add_text(ie_tree, tvb, offset + 1, 1,
+ "Length: %u", info_element_len);
+
+ switch ((codeset << 8) | info_element) {
+
+ case CS0 | Q933_IE_SEGMENTED_MESSAGE:
+ dissect_q933_segmented_message_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_BEARER_CAPABILITY:
+ case CS0 | Q933_IE_LOW_LAYER_COMPAT:
+ dissect_q933_bearer_capability_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_CAUSE:
+ dissect_q933_cause_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree,
+ hf_q933_cause_value);
+ break;
+
+ case CS0 | Q933_IE_CALL_STATE:
+ dissect_q933_call_state_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_CHANNEL_IDENTIFICATION:
+ dissect_q933_channel_identification_ie(
+ tvb, offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_PROGRESS_INDICATOR:
+ dissect_q933_progress_indicator_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_NETWORK_SPECIFIC_FACIL:
+ case CS0 | Q933_IE_TRANSIT_NETWORK_SEL:
+ dissect_q933_ns_facilities_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_DISPLAY:
+ dissect_q933_ia5_ie(tvb, offset + 2,
+ info_element_len, ie_tree,
+ "Display information");
+ break;
+
+ case CS0 | Q933_IE_E2E_TRANSIT_DELAY:
+ dissect_q933_e2e_transit_delay_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_TD_SELECTION_AND_INT:
+ dissect_q933_td_selection_and_int_ie(
+ tvb, offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_PL_BINARY_PARAMETERS:
+ dissect_q933_pl_binary_parameters_ie(
+ tvb, offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_REVERSE_CHARGE_IND:
+ dissect_q933_reverse_charge_ind_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_CALLING_PARTY_NUMBER:
+ dissect_q933_number_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree,
+ hf_q933_calling_party_number);
+ break;
+
+ case CS0 | Q933_IE_CONNECTED_NUMBER:
+ dissect_q933_number_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree,
+ hf_q933_connected_number);
+ break;
+
+ case CS0 | Q933_IE_CALLED_PARTY_NUMBER:
+ dissect_q933_number_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree,
+ hf_q933_called_party_number);
+ break;
+
+ case CS0 | Q933_IE_CALLING_PARTY_SUBADDR:
+ case CS0 | Q933_IE_CALLED_PARTY_SUBADDR:
+ dissect_q933_party_subaddr_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_HIGH_LAYER_COMPAT:
+ dissect_q933_high_layer_compat_ie(tvb,
+ offset + 2, info_element_len,
+ ie_tree);
+ break;
+
+ case CS0 | Q933_IE_USER_USER:
+ dissect_q933_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;
+ }
+}
+
+void
+proto_register_q933(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_q933_discriminator,
+ { "Protocol discriminator", "q933.disc", FT_UINT8, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_call_ref_len,
+ { "Call reference value length", "q933.call_ref_len", FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_call_ref_flag,
+ { "Call reference flag", "q933.call_ref_flag", FT_BOOLEAN, BASE_NONE, TFS(&tfs_call_ref_flag), 0x0,
+ "", HFILL }},
+
+ { &hf_q933_call_ref,
+ { "Call reference value", "q933.call_ref", FT_BYTES, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_message_type,
+ { "Message type", "q933.message_type", FT_UINT8, BASE_HEX, VALS(q933_message_type_vals), 0x0,
+ "", HFILL }},
+
+ { &hf_q933_cause_value,
+ { "Cause value", "q933.cause_value", FT_UINT8, BASE_DEC, VALS(q933_cause_code_vals), 0x0,
+ "", HFILL }},
+
+ { &hf_q933_calling_party_number,
+ { "Calling party number digits", "q933.calling_party_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_called_party_number,
+ { "Called party number digits", "q933.called_party_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_connected_number,
+ { "Connected party number digits", "q933.connected_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+
+ { &hf_q933_redirecting_number,
+ { "Redirecting party number digits", "q933.redirecting_number.digits", FT_STRING, BASE_NONE, NULL, 0x0,
+ "", HFILL }},
+ };
+ static gint *ett[] = {
+ &ett_q933,
+ &ett_q933_ie,
+ };
+
+ proto_q933 = proto_register_protocol("Q.933", "Q.933", "q933");
+ proto_register_field_array (proto_q933, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ register_dissector("q933", dissect_q933, proto_q933);
+}
+
+void
+proto_reg_handoff_q933(void)
+{
+ dissector_handle_t q933_handle;
+
+ q933_handle = create_dissector_handle(dissect_q933, proto_q933);
+ dissector_add("fr.osinl", NLPID_Q_933, q933_handle);
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff