forked from osmocom/wireshark
b7b80d94be
directory to the epan directory. Some of them should perhaps ultimately be moved to epan/dissectors, if they pertain only to stuff exported by a particular dissector. Fix Gerald's e-mail address in files we're moving. svn path=/trunk/; revision=15844
462 lines
17 KiB
C
462 lines
17 KiB
C
/* packet-osi-options.c
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* Routines for the decode of ISO/OSI option part
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* Covers:
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* ISO 8473 CLNP (ConnectionLess Mode Network Service Protocol)
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* ISO 10589 ISIS (Intradomain Routing Information Exchange Protocol)
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* ISO 9542 ESIS (End System To Intermediate System Routing Exchange Protocol)
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*
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* $Id$
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* Ralf Schneider <Ralf.Schneider@t-online.de>
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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 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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 <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/nlpid.h>
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#include "packet-osi.h"
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#include "packet-isis.h"
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#include "packet-isis-clv.h"
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#include "packet-isis-hello.h"
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#include "packet-isis-lsp.h"
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#include "packet-isis-snp.h"
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#include "packet-esis.h"
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#include "packet-osi-options.h"
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#define OSI_OPT_SECURITY 0xc5
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#define OSI_OPT_QOS_MAINTANANCE 0xc3
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#define OSI_OPT_PRIORITY 0xcd
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#define OSI_OPT_ADDRESS_MASK 0xe1
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#define OSI_OPT_SNPA_MASK 0xe2
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#define OSI_OPT_ES_CONFIG_TIMER 0xc6
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#define OSI_OPT_MAX_PRIORITY 0x0e
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#define OSI_OPT_PADDING 0xcc
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#define OSI_OPT_SOURCE_ROUTING 0xc8
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#define OSI_OPT_RECORD_OF_ROUTE 0xcb
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#define OSI_OPT_REASON_OF_DISCARD 0xc1
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#define OSI_OPT_SEC_MASK 0xc0
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#define OSI_OPT_SEC_RESERVED 0x00
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#define OSI_OPT_SEC_SRC_ADR_SPEC 0x40
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#define OSI_OPT_SEC_DST_ADR_SPEC 0x80
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#define OSI_OPT_SEC_GLOBAL_UNIQUE 0xc0
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#define OSI_OPT_QOS_MASK 0xc0
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#define OSI_OPT_QOS_RESERVED 0x00
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#define OSI_OPT_QOS_SRC_ADR_SPEC 0x40
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#define OSI_OPT_QOS_DST_ADR_SPEC 0x80
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#define OSI_OPT_QOS_GLOBAL_UNIQUE 0xc0
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#define OSI_OPT_QOS_SUB_MASK 0x3f
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#define OSI_OPT_QOS_SUB_RSVD 0x20
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#define OSI_OPT_QOS_SUB_SEQ_VS_TRS 0x10
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#define OSI_OPT_QOS_SUB_CONG_EXPED 0x08
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#define OSI_OPT_QOS_SUB_TSD_VS_COST 0x04
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#define OSI_OPT_QOS_SUB_RESERR_TRS 0x02
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#define OSI_OPT_QOS_SUB_RESERR_COST 0x01
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#define OSI_OPT_RFD_GENERAL 0x00
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#define OSI_OPT_RFD_ADDRESS 0x80
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#define OSI_OPT_RFD_SOURCE_ROUTING 0x90
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#define OSI_OPT_RFD_LIFETIME 0xa0
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#define OSI_OPT_RFD_PDU_DISCARDED 0xb0
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#define OSI_OPT_RFD_REASSEMBLY 0xc0
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#define OSI_OPT_RFD_MASK 0xf0
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#define OSI_OPT_RFD_SUB_MASK 0x0f
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static gint ott_osi_options = -1;
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static gint ott_osi_qos = -1;
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static gint ott_osi_route = -1;
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static gint ott_osi_redirect = -1;
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static const value_string osi_opt_sec_vals[] = {
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{ OSI_OPT_SEC_RESERVED, "Reserved"},
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{ OSI_OPT_SEC_SRC_ADR_SPEC, "Source Address Specific"},
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{ OSI_OPT_SEC_DST_ADR_SPEC, "Destination Address Specific"},
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{ OSI_OPT_SEC_GLOBAL_UNIQUE, "Globally Unique"},
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{ 0, NULL} };
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static const value_string osi_opt_qos_vals[] = {
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{ OSI_OPT_QOS_RESERVED, "Reserved"},
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{ OSI_OPT_QOS_SRC_ADR_SPEC, "Source Address Specific"},
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{ OSI_OPT_QOS_DST_ADR_SPEC, "Destination Address Specific"},
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{ OSI_OPT_QOS_GLOBAL_UNIQUE, "Globally Unique"},
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{ 0, NULL} };
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static const value_string osi_opt_qos_sub_vals[] = {
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{ 0x20, " xx10 0000 Reserved"},
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{ 0x10, " xx01 0000 Sequencing versus transit delay"},
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{ 0x08, " xx00 1000 Congestion experienced"},
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{ 0x04, " xx00 0100 Transit delay versus cost"},
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{ 0x02, " xx00 0010 Residual error probability versus transit delay"},
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{ 0x01, " xx00 0001 Residual error probability versus cost"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_general[] = {
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{ 0x00, "Reason not specified"},
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{ 0x01, "Protocol procedure error"},
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{ 0x02, "Incorrect checksum"},
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{ 0x03, "PDU discarded due to congestion"},
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{ 0x04, "Header syntax error ( cannot be parsed )"},
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{ 0x05, "Segmentation needed but not permitted"},
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{ 0x06, "Incomplete PDU received"},
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{ 0x07, "Duplicate option"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_address[] = {
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{ 0x00, "Destination Address unreachable"},
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{ 0x01, "Destination Address unknown"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_src_route[] = {
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{ 0x00, "Unspecified source routing error"},
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{ 0x01, "Syntax error in source routing field"},
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{ 0x02, "Unknown address in source routing field"},
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{ 0x03, "Path not acceptable"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_lifetime[] = {
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{ 0x00, "Lifetime expired while data unit in transit"},
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{ 0x01, "Lifetime expired during reassembly"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_discarded[] = {
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{ 0x00, "Unsupported option not specified"},
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{ 0x01, "Unsupported protocol version"},
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{ 0x02, "Unsupported security option"},
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{ 0x03, "Unsupported source routing option"},
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{ 0x04, "Unsupported recording of route option"},
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{ 0, NULL} };
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static const value_string osi_opt_rfd_reassembly[] = {
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{ 0x00, "Reassembly interference"},
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{ 0, NULL} };
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static void
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dissect_option_qos( const guchar type, const guchar sub_type, int offset,
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guchar len, tvbuff_t *tvb, proto_tree *tree ) {
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guchar tmp_type = 0;
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proto_item *ti;
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proto_tree *osi_qos_tree = NULL;
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ti = proto_tree_add_text( tree, tvb, offset, len,
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"Quality of service maintenance: %s",
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val_to_str( type, osi_opt_qos_vals, "Unknown (0x%x)") );
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osi_qos_tree = proto_item_add_subtree( ti, ott_osi_qos );
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if ( OSI_OPT_SEC_MASK == type ) { /* Analye BIT field to get all Values */
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tmp_type = sub_type & OSI_OPT_QOS_SUB_RSVD;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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tmp_type = sub_type & OSI_OPT_QOS_SUB_SEQ_VS_TRS;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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tmp_type = sub_type &OSI_OPT_QOS_SUB_CONG_EXPED;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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tmp_type = sub_type & OSI_OPT_QOS_SUB_TSD_VS_COST;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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tmp_type = sub_type & OSI_OPT_QOS_SUB_RESERR_TRS;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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tmp_type = sub_type & OSI_OPT_QOS_SUB_RESERR_COST;
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if ( tmp_type ) {
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proto_tree_add_text( osi_qos_tree, tvb, offset, len,
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val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
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}
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}
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}
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static void
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dissect_option_route( guchar parm_type, int offset, guchar parm_len,
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tvbuff_t *tvb, proto_tree *tree ) {
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guchar next_hop = 0;
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guint16 this_hop = 0;
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guchar netl = 0;
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guchar last_hop = 0;
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guchar cnt_hops = 0;
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proto_item *ti;
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proto_tree *osi_route_tree = NULL;
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static const value_string osi_opt_route[] = {
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{ 0x03, "No Network Entity Titles Recorded Yet"},
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{ 0xff, "Recording Terminated !"},
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{ 0, NULL} };
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if ( parm_type == OSI_OPT_SOURCE_ROUTING ) {
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next_hop = tvb_get_guint8(tvb, offset + 1 );
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netl = tvb_get_guint8(tvb, next_hop + 2 );
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this_hop = offset + 3; /* points to first netl */
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ti = proto_tree_add_text( tree, tvb, offset + next_hop, netl,
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"Source Routing: %s ( Next Hop Highlighted In Data Buffer )",
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(tvb_get_guint8(tvb, offset) == 0) ? "Partial Source Routing" :
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"Complete Source Routing" );
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}
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else {
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last_hop = tvb_get_guint8(tvb, offset + 1 );
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/* points to the end of the list */
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netl = tvb_get_guint8(tvb, last_hop );
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/* mis-used to highlight buffer */
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ti = proto_tree_add_text( tree, tvb, offset + next_hop, netl,
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"Record of Route: %s : %s",
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(tvb_get_guint8(tvb, offset) == 0) ? "Partial Source Routing" :
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"Complete Source Routing" ,
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val_to_str( last_hop, osi_opt_route, "Unknown (0x%x" ) );
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if ( 255 == last_hop )
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this_hop = parm_len + 1; /* recording terminated, nothing to show */
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else
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this_hop = offset + 3;
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}
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osi_route_tree = proto_item_add_subtree( ti, ott_osi_route );
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while ( this_hop < parm_len ) {
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netl = tvb_get_guint8(tvb, this_hop + 1);
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proto_tree_add_text( osi_route_tree, tvb, offset + this_hop, netl,
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"Hop #%3u NETL: %2u, NET: %s",
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cnt_hops++,
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netl,
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print_nsap_net( tvb_get_ptr(tvb, this_hop + 1, netl), netl ) );
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this_hop += 1 + netl;
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}
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}
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static void
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dissect_option_rfd( const guchar error, const guchar field, int offset,
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guchar len, tvbuff_t *tvb, proto_tree *tree ) {
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guchar error_class = 0;
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const char *format_string[] =
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{ "Reason for discard {General} : %s, in field %u",
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"Reason for discard {Address} : %s, in field %u",
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"Reason for discard {Source Routing}: %s, in field %u",
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"Reason for discard {Lifetime} : %s, in field %u",
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"Reason for discard {PDU discarded} : %s, in field %u",
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"Reason for discard {Reassembly} : %s, in field %u"
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};
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error_class = error & OSI_OPT_RFD_MASK;
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tvb_ensure_bytes_exist(tvb, offset + field, 1);
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if ( OSI_OPT_RFD_GENERAL == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[0],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_general, "Unknown (0x%x)"), field );
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}
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else if ( OSI_OPT_RFD_ADDRESS == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[1],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_address, "Unknown (0x%x)"), field );
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}
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else if ( OSI_OPT_RFD_SOURCE_ROUTING == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[2],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_src_route, "Unknown (0x%x)"), field );
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}
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else if ( OSI_OPT_RFD_LIFETIME == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[3],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_lifetime, "Unknown (0x%x)"), field );
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}
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else if ( OSI_OPT_RFD_PDU_DISCARDED == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[4],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_discarded, "Unknown (0x%x)"), field );
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}
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else if ( OSI_OPT_RFD_REASSEMBLY == error_class ) {
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proto_tree_add_text( tree, tvb, offset + field, 1, format_string[5],
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val_to_str( error & OSI_OPT_RFD_SUB_MASK,
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osi_opt_rfd_reassembly, "Unknown (0x%x)"), field );
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}
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else {
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proto_tree_add_text( tree, tvb, offset, len,
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"Reason for discard: UNKNOWN Error Class" );
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}
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}
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/* ############################## Dissection Functions ###################### */
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/*
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* Name: dissect_osi_options()
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*
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* Description:
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* Main entry area for esis de-mangling. This will build the
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* main esis tree data and call the sub-protocols as needed.
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*
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* Input:
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* guchar : length of option section
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* tvbuff_t * : tvbuff containing packet data
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* int : offset into packet where we are (packet_data[offset]== start
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* of what we care about)
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* proto_tree * : tree of display data. May be NULL.
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*
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* Output:
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* void, but we will add to the proto_tree if it is not NULL.
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*/
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void
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dissect_osi_options( guchar opt_len, tvbuff_t *tvb,
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int offset, proto_tree *tree) {
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proto_item *ti;
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proto_tree *osi_option_tree = NULL;
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guchar parm_len = 0;
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guchar parm_type = 0;
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guint8 octet;
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if (tree) {
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if ( 0 == opt_len ) {
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proto_tree_add_text( tree, tvb, offset, 0,
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"### No Options for this PDU ###" );
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return;
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}
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ti = proto_tree_add_text( tree, tvb, offset, opt_len,
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"### Option Section ###" );
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osi_option_tree = proto_item_add_subtree( ti, ott_osi_options );
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while ( 0 < opt_len ) {
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parm_type = (int) tvb_get_guint8(tvb, offset);
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offset++;
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parm_len = (int) tvb_get_guint8(tvb, offset);
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offset++;
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switch ( parm_type ) {
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case OSI_OPT_QOS_MAINTANANCE:
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octet = tvb_get_guint8(tvb, offset);
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dissect_option_qos( (guchar) (octet&OSI_OPT_QOS_MASK),
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(guchar) (octet&OSI_OPT_QOS_SUB_MASK),
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offset, parm_len, tvb, osi_option_tree );
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break;
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case OSI_OPT_SECURITY:
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octet = tvb_get_guint8(tvb, offset);
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"Security type: %s",
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val_to_str( octet&OSI_OPT_SEC_MASK,
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osi_opt_sec_vals, "Unknown (0x%x)") );
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break;
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case OSI_OPT_PRIORITY:
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octet = tvb_get_guint8(tvb, offset);
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if ( OSI_OPT_MAX_PRIORITY >= octet ) {
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"Priority : %u", octet );
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}
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else {
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"Priority : %u ( Invalid )",
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octet );
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}
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break;
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case OSI_OPT_ADDRESS_MASK:
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"Address Mask: %s",
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print_area( tvb_get_ptr(tvb, offset, parm_len), parm_len ) );
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break;
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case OSI_OPT_SNPA_MASK:
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"SNPA Mask : %s",
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print_system_id( tvb_get_ptr(tvb, offset, parm_len), parm_len ));
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break;
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case OSI_OPT_ES_CONFIG_TIMER:
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"ESCT : %u seconds", tvb_get_ntohs( tvb, offset ) );
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break;
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case OSI_OPT_PADDING:
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proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
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"Padding : %u Octets", parm_len ) ;
|
|
break;
|
|
case OSI_OPT_SOURCE_ROUTING:
|
|
case OSI_OPT_RECORD_OF_ROUTE:
|
|
dissect_option_route( parm_type,
|
|
offset, parm_len, tvb, osi_option_tree );
|
|
break;
|
|
case OSI_OPT_REASON_OF_DISCARD:
|
|
dissect_option_rfd( tvb_get_guint8(tvb, offset),
|
|
tvb_get_guint8(tvb, offset + 1),
|
|
offset, parm_len, tvb, osi_option_tree );
|
|
break;
|
|
}
|
|
opt_len -= parm_len + 2;
|
|
offset += parm_len;
|
|
}
|
|
}
|
|
} /* dissect-osi-options */
|
|
|
|
|
|
/*
|
|
* Name: proto_register_osi_options()
|
|
*
|
|
* Description:
|
|
* main register for esis protocol set. We register some display
|
|
* formats and the protocol module variables.
|
|
*
|
|
* NOTE: this procedure to autolinked by the makefile process that
|
|
* builds register.c
|
|
*
|
|
* Input:
|
|
* void
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
|
|
void
|
|
proto_register_osi_options(void) {
|
|
static gint *ott[] = {
|
|
&ott_osi_options,
|
|
&ott_osi_qos,
|
|
&ott_osi_route,
|
|
&ott_osi_redirect,
|
|
};
|
|
proto_register_subtree_array( ott, array_length(ott));
|
|
}
|