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wireshark/packet-osi-options.c

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/* packet-osi-options.c
* Routines for the decode of ISO/OSI option part
* Covers:
* ISO 8473 CLNP (ConnectionLess Mode Network Service Protocol)
* ISO 10589 ISIS (Intradomain Routing Information Exchange Protocol)
* ISO 9542 ESIS (End System To Intermediate System Routing Exchange Protocol)
*
* $Id: packet-osi-options.c,v 1.16 2003/12/13 02:30:18 guy Exp $
* Ralf Schneider <Ralf.Schneider@t-online.de>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* 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 <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "nlpid.h"
#include "packet-osi.h"
#include "packet-isis.h"
#include "packet-isis-clv.h"
#include "packet-isis-hello.h"
#include "packet-isis-lsp.h"
#include "packet-isis-snp.h"
#include "packet-esis.h"
#include "packet-osi-options.h"
#define OSI_OPT_SECURITY 0xc5
#define OSI_OPT_QOS_MAINTANANCE 0xc3
#define OSI_OPT_PRIORITY 0xcd
#define OSI_OPT_ADDRESS_MASK 0xe1
#define OSI_OPT_SNPA_MASK 0xe2
#define OSI_OPT_ES_CONFIG_TIMER 0xc6
#define OSI_OPT_MAX_PRIORITY 0x0e
#define OSI_OPT_PADDING 0xcc
#define OSI_OPT_SOURCE_ROUTING 0xc8
#define OSI_OPT_RECORD_OF_ROUTE 0xcb
#define OSI_OPT_REASON_OF_DISCARD 0xc1
#define OSI_OPT_SEC_MASK 0xc0
#define OSI_OPT_SEC_RESERVED 0x00
#define OSI_OPT_SEC_SRC_ADR_SPEC 0x40
#define OSI_OPT_SEC_DST_ADR_SPEC 0x80
#define OSI_OPT_SEC_GLOBAL_UNIQUE 0xc0
#define OSI_OPT_QOS_MASK 0xc0
#define OSI_OPT_QOS_RESERVED 0x00
#define OSI_OPT_QOS_SRC_ADR_SPEC 0x40
#define OSI_OPT_QOS_DST_ADR_SPEC 0x80
#define OSI_OPT_QOS_GLOBAL_UNIQUE 0xc0
#define OSI_OPT_QOS_SUB_MASK 0x3f
#define OSI_OPT_QOS_SUB_RSVD 0x20
#define OSI_OPT_QOS_SUB_SEQ_VS_TRS 0x10
#define OSI_OPT_QOS_SUB_CONG_EXPED 0x08
#define OSI_OPT_QOS_SUB_TSD_VS_COST 0x04
#define OSI_OPT_QOS_SUB_RESERR_TRS 0x02
#define OSI_OPT_QOS_SUB_RESERR_COST 0x01
#define OSI_OPT_RFD_GENERAL 0x00
#define OSI_OPT_RFD_ADDRESS 0x80
#define OSI_OPT_RFD_SOURCE_ROUTING 0x90
#define OSI_OPT_RFD_LIFETIME 0xa0
#define OSI_OPT_RFD_PDU_DISCARDED 0xb0
#define OSI_OPT_RFD_REASSEMBLY 0xc0
#define OSI_OPT_RFD_MASK 0xf0
#define OSI_OPT_RFD_SUB_MASK 0x0f
static gint ott_osi_options = -1;
static gint ott_osi_qos = -1;
static gint ott_osi_route = -1;
static gint ott_osi_redirect = -1;
static const value_string osi_opt_sec_vals[] = {
{ OSI_OPT_SEC_RESERVED, "Reserved"},
{ OSI_OPT_SEC_SRC_ADR_SPEC, "Source Address Specific"},
{ OSI_OPT_SEC_DST_ADR_SPEC, "Destination Address Specific"},
{ OSI_OPT_SEC_GLOBAL_UNIQUE, "Globally Unique"},
{ 0, NULL} };
static const value_string osi_opt_qos_vals[] = {
{ OSI_OPT_QOS_RESERVED, "Reserved"},
{ OSI_OPT_QOS_SRC_ADR_SPEC, "Source Address Specific"},
{ OSI_OPT_QOS_DST_ADR_SPEC, "Destination Address Specific"},
{ OSI_OPT_QOS_GLOBAL_UNIQUE, "Globally Unique"},
{ 0, NULL} };
static const value_string osi_opt_qos_sub_vals[] = {
{ 0x20, " xx10 0000 Reserved"},
{ 0x10, " xx01 0000 Sequencing versus transit delay"},
{ 0x08, " xx00 1000 Congestion experienced"},
{ 0x04, " xx00 0100 Transit delay versus cost"},
{ 0x02, " xx00 0010 Residual error probability versus transit delay"},
{ 0x01, " xx00 0001 Residual error probability versus cost"},
{ 0, NULL} };
static const value_string osi_opt_rfd_general[] = {
{ 0x00, "Reason not specified"},
{ 0x01, "Protocol procedure error"},
{ 0x02, "Incorrect checksum"},
{ 0x03, "PDU discarded due to congestion"},
{ 0x04, "Header syntax error ( cannot be parsed )"},
{ 0x05, "Segmentation needed but not permitted"},
{ 0x06, "Incomplete PDU received"},
{ 0x07, "Duplicate option"},
{ 0, NULL} };
static const value_string osi_opt_rfd_address[] = {
{ 0x00, "Destination Address unreachable"},
{ 0x01, "Destination Address unknown"},
{ 0, NULL} };
static const value_string osi_opt_rfd_src_route[] = {
{ 0x00, "Unspecified source routing error"},
{ 0x01, "Syntax error in source routing field"},
{ 0x02, "Unknown address in source routing field"},
{ 0x03, "Path not acceptable"},
{ 0, NULL} };
static const value_string osi_opt_rfd_lifetime[] = {
{ 0x00, "Lifetime expired while data unit in transit"},
{ 0x01, "Lifetime expired during reassembly"},
{ 0, NULL} };
static const value_string osi_opt_rfd_discarded[] = {
{ 0x00, "Unsupported option not specified"},
{ 0x01, "Unsupported protocol version"},
{ 0x02, "Unsupported security option"},
{ 0x03, "Unsupported source routing option"},
{ 0x04, "Unsupported recording of route option"},
{ 0, NULL} };
static const value_string osi_opt_rfd_reassembly[] = {
{ 0x00, "Reassembly interference"},
{ 0, NULL} };
static void
dissect_option_qos( const guchar type, const guchar sub_type, int offset,
guchar len, tvbuff_t *tvb, proto_tree *tree ) {
guchar tmp_type = 0;
proto_item *ti;
proto_tree *osi_qos_tree = NULL;
ti = proto_tree_add_text( tree, tvb, offset, len,
"Quality of service maintenance: %s",
val_to_str( type, osi_opt_qos_vals, "Unknown (0x%x)") );
osi_qos_tree = proto_item_add_subtree( ti, ott_osi_qos );
if ( OSI_OPT_SEC_MASK == type ) { /* Analye BIT field to get all Values */
tmp_type = sub_type & OSI_OPT_QOS_SUB_RSVD;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
tmp_type = sub_type & OSI_OPT_QOS_SUB_SEQ_VS_TRS;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
tmp_type = sub_type &OSI_OPT_QOS_SUB_CONG_EXPED;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
tmp_type = sub_type & OSI_OPT_QOS_SUB_TSD_VS_COST;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
tmp_type = sub_type & OSI_OPT_QOS_SUB_RESERR_TRS;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
tmp_type = sub_type & OSI_OPT_QOS_SUB_RESERR_COST;
if ( tmp_type ) {
proto_tree_add_text( osi_qos_tree, tvb, offset, len,
val_to_str( tmp_type, osi_opt_qos_sub_vals, "Unknown (0x%x)") );
}
}
}
static void
dissect_option_route( guchar parm_type, int offset, guchar parm_len,
tvbuff_t *tvb, proto_tree *tree ) {
guchar next_hop = 0;
guchar this_hop = 0;
guchar netl = 0;
guchar last_hop = 0;
guchar cnt_hops = 0;
proto_item *ti;
proto_tree *osi_route_tree = NULL;
static const value_string osi_opt_route[] = {
{ 0x03, "No Network Entity Titles Recorded Yet"},
{ 0xff, "Recording Terminated !"},
{ 0, NULL} };
if ( parm_type == OSI_OPT_SOURCE_ROUTING ) {
next_hop = tvb_get_guint8(tvb, offset + 1 );
netl = tvb_get_guint8(tvb, next_hop + 2 );
this_hop = offset + 3; /* points to first netl */
ti = proto_tree_add_text( tree, tvb, offset + next_hop, netl,
"Source Routing: %s ( Next Hop Highlighted In Data Buffer )",
(tvb_get_guint8(tvb, offset) == 0) ? "Partial Source Routing" :
"Complete Source Routing" );
}
else {
last_hop = tvb_get_guint8(tvb, offset + 1 );
/* points to the end of the list */
netl = tvb_get_guint8(tvb, last_hop );
/* mis-used to highlight buffer */
ti = proto_tree_add_text( tree, tvb, offset + next_hop, netl,
"Record of Route: %s : %s",
(tvb_get_guint8(tvb, offset) == 0) ? "Partial Source Routing" :
"Complete Source Routing" ,
val_to_str( last_hop, osi_opt_route, "Unknown (0x%x" ) );
if ( 255 == last_hop )
this_hop = parm_len + 1; /* recording terminated, nothing to show */
else
this_hop = offset + 3;
}
osi_route_tree = proto_item_add_subtree( ti, ott_osi_route );
while ( this_hop < parm_len ) {
netl = tvb_get_guint8(tvb, this_hop + 1);
proto_tree_add_text( osi_route_tree, tvb, offset + this_hop, netl,
"Hop #%3u NETL: %2u, NET: %s",
cnt_hops++,
netl,
print_nsap_net( tvb_get_ptr(tvb, this_hop + 1, netl), netl ) );
this_hop += 1 + netl;
}
}
static void
dissect_option_rfd( const guchar error, const guchar field, int offset,
guchar len, tvbuff_t *tvb, proto_tree *tree ) {
guchar error_class = 0;
char *format_string[] =
{ "Reason for discard {General} : %s, in field %u",
"Reason for discard {Address} : %s, in field %u",
"Reason for discard {Source Routing}: %s, in field %u",
"Reason for discard {Lifetime} : %s, in field %u",
"Reason for discard {PDU discarded} : %s, in field %u",
"Reason for discard {Reassembly} : %s, in field %u"
};
error_class = error & OSI_OPT_RFD_MASK;
if ( OSI_OPT_RFD_GENERAL == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[0],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_general, "Unknown (0x%x)"), field );
}
else if ( OSI_OPT_RFD_ADDRESS == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[1],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_address, "Unknown (0x%x)"), field );
}
else if ( OSI_OPT_RFD_SOURCE_ROUTING == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[2],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_src_route, "Unknown (0x%x)"), field );
}
else if ( OSI_OPT_RFD_LIFETIME == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[3],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_lifetime, "Unknown (0x%x)"), field );
}
else if ( OSI_OPT_RFD_PDU_DISCARDED == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[4],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_discarded, "Unknown (0x%x)"), field );
}
else if ( OSI_OPT_RFD_REASSEMBLY == error_class ) {
proto_tree_add_text( tree, tvb, offset + field, 1, format_string[5],
val_to_str( error & OSI_OPT_RFD_SUB_MASK,
osi_opt_rfd_reassembly, "Unknown (0x%x)"), field );
}
else {
proto_tree_add_text( tree, tvb, offset, len,
"Reason for discard: UNKNOWN Error Class" );
}
}
/* ############################## Dissection Functions ###################### */
/*
* Name: dissect_osi_options()
*
* Description:
* Main entry area for esis de-mangling. This will build the
* main esis tree data and call the sub-protocols as needed.
*
* Input:
* guchar : length of option section
* tvbuff_t * : tvbuff containing packet data
* int : offset into packet where we are (packet_data[offset]== start
* of what we care about)
* proto_tree * : tree of display data. May be NULL.
*
* Output:
* void, but we will add to the proto_tree if it is not NULL.
*/
void
dissect_osi_options( guchar opt_len, tvbuff_t *tvb,
int offset, proto_tree *tree) {
proto_item *ti;
proto_tree *osi_option_tree = NULL;
guchar parm_len = 0;
guchar parm_type = 0;
guint8 octet;
if (tree) {
if ( 0 == opt_len ) {
proto_tree_add_text( tree, tvb, offset, 0,
"### No Options for this PDU ###" );
return;
}
ti = proto_tree_add_text( tree, tvb, offset, opt_len,
"### Option Section ###" );
osi_option_tree = proto_item_add_subtree( ti, ott_osi_options );
while ( 0 < opt_len ) {
parm_type = (int) tvb_get_guint8(tvb, offset);
offset++;
parm_len = (int) tvb_get_guint8(tvb, offset);
offset++;
switch ( parm_type ) {
case OSI_OPT_QOS_MAINTANANCE:
octet = tvb_get_guint8(tvb, offset);
dissect_option_qos( (guchar) (octet&OSI_OPT_QOS_MASK),
(guchar) (octet&OSI_OPT_QOS_SUB_MASK),
offset, parm_len, tvb, osi_option_tree );
break;
case OSI_OPT_SECURITY:
octet = tvb_get_guint8(tvb, offset);
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"Security type: %s",
val_to_str( octet&OSI_OPT_SEC_MASK,
osi_opt_sec_vals, "Unknown (0x%x)") );
break;
case OSI_OPT_PRIORITY:
octet = tvb_get_guint8(tvb, offset);
if ( OSI_OPT_MAX_PRIORITY >= octet ) {
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"Priority : %u", octet );
}
else {
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"Priority : %u ( Invalid )",
octet );
}
break;
case OSI_OPT_ADDRESS_MASK:
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"Address Mask: %s",
print_area( tvb_get_ptr(tvb, offset, parm_len), parm_len ) );
break;
case OSI_OPT_SNPA_MASK:
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"SNPA Mask : %s",
print_system_id( tvb_get_ptr(tvb, offset, parm_len), parm_len ));
break;
case OSI_OPT_ES_CONFIG_TIMER:
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"ESCT : %u seconds", tvb_get_ntohs( tvb, offset ) );
break;
case OSI_OPT_PADDING:
proto_tree_add_text( osi_option_tree, tvb, offset, parm_len,
"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));
}
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