From 669db206cb1f270046ad400fff7655e20c63e723 Mon Sep 17 00:00:00 2001
From: Gilbert Ramirez <gram@alumni.rice.edu>
Date: Sun, 18 Jul 2004 18:06:47 +0000
Subject: Move dissectors to epan/dissectors directory.

Also move ncp222.py, x11-fields, process-x11-fields.pl,
make-reg-dotc, and make-reg-dotc.py.

Adjust #include lines in files that include packet-*.h
files.

svn path=/trunk/; revision=11410
---
 epan/dissectors/packet-clnp.c | 2396 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 2396 insertions(+)
 create mode 100644 epan/dissectors/packet-clnp.c

(limited to 'epan/dissectors/packet-clnp.c')

diff --git a/epan/dissectors/packet-clnp.c b/epan/dissectors/packet-clnp.c
new file mode 100644
index 0000000000..c94b855043
--- /dev/null
+++ b/epan/dissectors/packet-clnp.c
@@ -0,0 +1,2396 @@
+/* packet-clnp.c
+ * Routines for ISO/OSI network and transport protocol packet disassembly
+ *
+ * $Id$
+ * Laurent Deniel <laurent.deniel@free.fr>
+ * 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 <ctype.h>
+#include <glib.h>
+#include "prefs.h"
+#include <epan/packet.h>
+#include "reassemble.h"
+#include "packet-osi.h"
+#include "packet-osi-options.h"
+#include "packet-isis.h"
+#include "packet-esis.h"
+#include "nlpid.h"
+#include "ipproto.h"
+
+/* protocols and fields */
+
+static int  proto_clnp         = -1;
+static gint ett_clnp           = -1;
+static gint ett_clnp_type      = -1;
+static gint ett_clnp_segments  = -1;
+static gint ett_clnp_segment   = -1;
+static gint ett_clnp_disc_pdu  = -1;
+
+static int hf_clnp_id          = -1;
+static int hf_clnp_length      = -1;
+static int hf_clnp_version     = -1;
+static int hf_clnp_ttl         = -1;
+static int hf_clnp_type        = -1;
+static int hf_clnp_pdu_length  = -1;
+static int hf_clnp_checksum    = -1;
+static int hf_clnp_dest_length = -1;
+static int hf_clnp_dest        = -1;
+static int hf_clnp_src_length  = -1;
+static int hf_clnp_src         = -1;
+static int hf_clnp_segments    = -1;
+static int hf_clnp_segment     = -1;
+static int hf_clnp_segment_overlap = -1;
+static int hf_clnp_segment_overlap_conflict = -1;
+static int hf_clnp_segment_multiple_tails = -1;
+static int hf_clnp_segment_too_long_segment = -1;
+static int hf_clnp_segment_error = -1;
+static int hf_clnp_reassembled_in = -1;
+
+static int  proto_cotp         = -1;
+static gint ett_cotp           = -1;
+static gint ett_cotp_segments  = -1;
+static gint ett_cotp_segment   = -1;
+
+static int hf_cotp_srcref      = -1;
+static int hf_cotp_destref     = -1;
+static int hf_cotp_type        = -1;
+static int hf_cotp_segments    = -1;
+static int hf_cotp_segment     = -1;
+static int hf_cotp_segment_overlap = -1;
+static int hf_cotp_segment_overlap_conflict = -1;
+static int hf_cotp_segment_multiple_tails = -1;
+static int hf_cotp_segment_too_long_segment = -1;
+static int hf_cotp_segment_error = -1;
+static int hf_cotp_reassembled_in = -1;
+
+static int  proto_cltp         = -1;
+static gint ett_cltp           = -1;
+
+static int hf_cltp_type = -1;
+
+static const fragment_items clnp_frag_items = {
+	&ett_clnp_segment,
+	&ett_clnp_segments,
+	&hf_clnp_segments,
+	&hf_clnp_segment,
+	&hf_clnp_segment_overlap,
+	&hf_clnp_segment_overlap_conflict,
+	&hf_clnp_segment_multiple_tails,
+	&hf_clnp_segment_too_long_segment,
+	&hf_clnp_segment_error,
+	&hf_clnp_reassembled_in,
+	"segments"
+};
+
+static const fragment_items cotp_frag_items = {
+	&ett_cotp_segment,
+	&ett_cotp_segments,
+	&hf_cotp_segments,
+	&hf_cotp_segment,
+	&hf_cotp_segment_overlap,
+	&hf_cotp_segment_overlap_conflict,
+	&hf_cotp_segment_multiple_tails,
+	&hf_cotp_segment_too_long_segment,
+	&hf_cotp_segment_error,
+	&hf_cotp_reassembled_in,
+	"segments"
+};
+
+static dissector_handle_t clnp_handle;
+static dissector_handle_t data_handle;
+
+/*
+ * ISO 8473 OSI CLNP definition (see RFC994)
+ *
+ *            _________________________________
+ *           |           Fixed Part            |
+ *           |_________________________________|
+ *           |          Address Part           |
+ *           |_________________________________|
+ *           |   Segmentation Part (optional)  |
+ *           |_________________________________|
+ *           |     Options Part (optional)     |
+ *           |_________________________________|
+ *           |         Data (optional)         |
+ *           |_________________________________|
+ */
+
+#define	ISO8473_V1  0x01    /* CLNP version 1 */
+
+/* Fixed part */
+
+#define CNF_TYPE		0x1f
+#define CNF_ERR_OK		0x20
+#define CNF_MORE_SEGS		0x40
+#define CNF_SEG_OK		0x80
+
+#define DT_NPDU			0x1C
+#define MD_NPDU			0x1D
+#define ER_NPDU			0x01
+#define ERQ_NPDU		0x1E
+#define ERP_NPDU		0x1F
+
+static const value_string npdu_type_abbrev_vals[] = {
+  { DT_NPDU,	"DT" },
+  { MD_NPDU,	"MD" },
+  { ER_NPDU,	"ER" },
+  { ERQ_NPDU,	"ERQ" },
+  { ERP_NPDU,	"ERP" },
+  { 0,		NULL }
+};
+
+static const value_string npdu_type_vals[] = {
+  { DT_NPDU,	"Data" },
+  { MD_NPDU,	"Multicast Data" },
+  { ER_NPDU,	"Error Report" },
+  { ERQ_NPDU,	"Echo Request" },
+  { ERP_NPDU,	"Echo Response" },
+  { 0,		NULL }
+};
+
+/* field position */
+
+#define P_CLNP_PROTO_ID		0
+#define P_CLNP_HDR_LEN		1
+#define P_CLNP_VERS		2
+#define P_CLNP_TTL		3
+#define P_CLNP_TYPE		4
+#define P_CLNP_SEGLEN		5
+#define P_CLNP_CKSUM		7
+#define P_CLNP_ADDRESS_PART	9
+
+/* Segmentation part */
+
+struct clnp_segment {
+  gushort	cng_id;		/* data unit identifier */
+  gushort	cng_off;	/* segment offset */
+  gushort	cng_tot_len;	/* total length */
+};
+
+/* NSAP selector */
+
+#define NSEL_NET 		0x00
+#define NSEL_NP  		0x20
+#define NSEL_TP  		0x21
+
+/*
+ * ISO8073 OSI COTP definition (see RFC905)
+ */
+
+/* don't use specific TPDU types to avoid alignment problems & copy overhead */
+
+/* TPDU definition */
+
+#define ED_TPDU        		0x1	/* COTP */
+#define EA_TPDU        		0x2	/* COTP */
+#define UD_TPDU        		0x4	/* CLTP */
+#define RJ_TPDU        		0x5	/* COTP */
+#define AK_TPDU        		0x6	/* COTP */
+#define ER_TPDU        		0x7	/* COTP */
+#define DR_TPDU        		0x8	/* COTP */
+#define DC_TPDU        		0xC	/* COTP */
+#define CC_TPDU        		0xD	/* COTP */
+#define CR_TPDU        		0xE	/* COTP */
+#define DT_TPDU        		0xF	/* COTP */
+
+static const value_string cotp_tpdu_type_abbrev_vals[] = {
+  { ED_TPDU,	"ED" },
+  { EA_TPDU,	"EA" },
+  { RJ_TPDU,	"RJ" },
+  { AK_TPDU,	"AK" },
+  { ER_TPDU,	"ER" },
+  { DR_TPDU,	"DR" },
+  { DC_TPDU,	"DC" },
+  { CC_TPDU,	"CC" },
+  { CR_TPDU,	"CR" },
+  { DT_TPDU,	"DT" },
+  { 0,		NULL }
+};
+
+static const value_string cltp_tpdu_type_abbrev_vals[] = {
+  { UD_TPDU,	"UD" },
+  { 0,		NULL }
+};
+
+/* field position */
+
+#define P_LI           		0
+#define P_TPDU         		1
+#define P_CDT          		1
+#define P_DST_REF      		2
+#define P_SRC_REF      		4
+#define P_TPDU_NR_0_1  		2
+#define P_TPDU_NR_234  		4
+#define P_VAR_PART_NDT 		5
+#define P_VAR_PART_EDT 		8
+#define P_VAR_PART_DC           6
+#define P_CDT_IN_AK    		8
+#define P_CDT_IN_RJ    		8
+#define P_REJECT_ER    		4
+#define P_REASON_IN_DR 		6
+#define P_CLASS_OPTION 		6
+
+/* TPDU length indicator */
+
+#define LI_NORMAL_DT_CLASS_01		 2
+#define LI_NORMAL_DT_WITH_CHECKSUM       8
+#define LI_NORMAL_DT_WITHOUT_CHECKSUM    4
+#define LI_EXTENDED_DT_WITH_CHECKSUM     11
+#define LI_EXTENDED_DT_WITHOUT_CHECKSUM  7
+#define LI_NORMAL_EA_WITH_CHECKSUM       8
+#define LI_NORMAL_EA_WITHOUT_CHECKSUM    4
+#define LI_EXTENDED_EA_WITH_CHECKSUM     11
+#define LI_EXTENDED_EA_WITHOUT_CHECKSUM  7
+#define LI_NORMAL_RJ                     4
+#define LI_EXTENDED_RJ                   9
+#define LI_MIN_DR                        6
+#define LI_MAX_DC                        9
+#define LI_MAX_AK                        27
+#define LI_MAX_EA                        11
+#define LI_MAX_ER			 8
+/* XXX - can we always decide this based on whether the length
+   indicator is odd or not?  What if the variable part has an odd
+   number of octets? */
+#define is_LI_NORMAL_AK(p)               ( ( p & 0x01 ) == 0 )
+
+/* variant part */
+
+#define VP_ACK_TIME     	0x85
+#define VP_RES_ERROR    	0x86
+#define VP_PRIORITY     	0x87
+#define VP_TRANSIT_DEL  	0x88
+#define VP_THROUGHPUT   	0x89
+#define VP_SEQ_NR       	0x8A         /* in AK */
+#define VP_REASSIGNMENT 	0x8B
+#define VP_FLOW_CNTL    	0x8C         /* in AK */
+#define VP_TPDU_SIZE    	0xC0
+#define VP_SRC_TSAP     	0xC1         /* in CR/CC */
+#define VP_DST_TSAP     	0xC2
+#define VP_CHECKSUM     	0xC3
+#define VP_VERSION_NR   	0xC4
+#define VP_PROTECTION   	0xC5
+#define VP_OPT_SEL      	0xC6
+#define VP_PROTO_CLASS  	0xC7
+#define VP_PREF_MAX_TPDU_SIZE  	0xF0
+#define VP_INACTIVITY_TIMER  	0xF2
+
+static const value_string tp_vpart_type_vals[] = {
+  { VP_ACK_TIME,		"ack time" },
+  { VP_RES_ERROR,		"res error" },
+  { VP_PRIORITY,		"priority" },
+  { VP_TRANSIT_DEL,		"transit delay" },
+  { VP_THROUGHPUT,		"throughput" },
+  { VP_SEQ_NR,			"seq number" },
+  { VP_REASSIGNMENT,		"reassignment" },
+  { VP_FLOW_CNTL,		"flow control" },
+  { VP_TPDU_SIZE,		"tpdu-size" },
+  { VP_SRC_TSAP,		"src-tsap" },
+  { VP_DST_TSAP,		"dst-tsap" },
+  { VP_CHECKSUM,		"checksum" },
+  { VP_VERSION_NR,		"version" },
+  { VP_PROTECTION,		"protection" },
+  { VP_OPT_SEL,			"options" },
+  { VP_PROTO_CLASS,		"proto class" },
+  { VP_PREF_MAX_TPDU_SIZE,	"preferred max TPDU size" },
+  { 0,				NULL }
+};
+
+static int hf_cotp_vp_src_tsap = -1; 
+static int hf_cotp_vp_dst_tsap = -1;
+static int hf_cotp_vp_src_tsap_bytes = -1; 
+static int hf_cotp_vp_dst_tsap_bytes = -1;
+
+
+/* misc */
+
+#define EXTRACT_SHORT(p) 	pntohs(p)
+#define EXTRACT_LONG(p) 	pntohl(p)
+
+/* global variables */
+
+/* List of dissectors to call for COTP packets put atop the Inactive
+   Subset of CLNP. */
+static heur_dissector_list_t cotp_is_heur_subdissector_list;
+/* List of dissectors to call for COTP packets put atop CLNP */
+static heur_dissector_list_t cotp_heur_subdissector_list;
+/* List of dissectors to call for CLNP packets */
+static heur_dissector_list_t clnp_heur_subdissector_list;
+
+/*
+ * Reassembly of CLNP.
+ */
+static GHashTable *clnp_segment_table = NULL;
+static GHashTable *clnp_reassembled_table = NULL;
+
+/*
+ * Reassembly of COTP.
+ */
+static GHashTable *cotp_segment_table = NULL;
+static GHashTable *cotp_reassembled_table = NULL;
+
+#define TSAP_DISPLAY_AUTO	0
+#define TSAP_DISPLAY_STRING	1
+#define TSAP_DISPLAY_BYTES	2
+
+
+/* options */
+static guint tp_nsap_selector = NSEL_TP;
+static gboolean always_decode_transport = FALSE;
+static gboolean clnp_reassemble = FALSE;
+static gboolean cotp_reassemble = FALSE;
+static gint32   tsap_display = TSAP_DISPLAY_AUTO;
+
+const enum_val_t tsap_display_options[] = {
+  {"auto", "As strings if printable", TSAP_DISPLAY_AUTO},
+  {"string", "As strings", TSAP_DISPLAY_STRING},
+  {"bytes", "As bytes", TSAP_DISPLAY_BYTES},
+  {NULL, NULL, -1}
+};
+
+
+/* function definitions */
+
+#define MAX_TSAP_LEN	32
+static gboolean is_all_printable(const guchar *stringtocheck, int length)
+{
+  gboolean allprintable;
+  int i;
+
+  allprintable=TRUE;
+  for (i=0;i<length;i++) {
+    if (!(isascii(stringtocheck[i]) && isprint(stringtocheck[i]))) {
+      allprintable=FALSE;
+      break;
+    }
+  }
+  return allprintable; 
+} /* is_all_printable */
+
+
+static gchar *print_tsap(const guchar *tsap, int length)
+{
+
+  static gchar  str[3][MAX_TSAP_LEN * 2 + 3];	/* TSAP in hex + '0x' + NULL */
+  static gchar *cur;
+  gchar tmp[3];
+  gboolean allprintable;
+
+  if (cur == &str[0][0]) {
+    cur = &str[1][0];
+  } else if (cur == &str[1][0]) {
+    cur = &str[2][0];
+  } else {
+    cur = &str[0][0];
+  }
+
+
+  cur[0] = '\0';
+  if (length <= 0 || length > MAX_TSAP_LEN)
+    sprintf(cur, "<unsupported TSAP length>");
+  else {
+    allprintable = is_all_printable(tsap,length);
+    if (!allprintable)
+      strcat(cur,"0x");
+    while (length != 0) {
+      if (allprintable)
+	sprintf(tmp, "%c", *tsap ++);
+      else
+	sprintf(tmp, "%02x", *tsap ++);
+      strcat(cur, tmp);
+      length --;
+    }
+  }
+  return cur;
+
+} /* print_tsap */
+
+static gboolean ositp_decode_var_part(tvbuff_t *tvb, int offset,
+				      int vp_length, int class_option,
+				      proto_tree *tree)
+{
+  guint8  code, length;
+  guint8  c1;
+  guint16 s, s1,s2,s3,s4;
+  guint32 t1, t2, t3, t4;
+  guint32 pref_max_tpdu_size;
+
+  while (vp_length != 0) {
+    code = tvb_get_guint8(tvb, offset);
+    proto_tree_add_text(tree, tvb, offset, 1,
+		"Parameter code:   0x%02x (%s)",
+			    code,
+			    val_to_str(code, tp_vpart_type_vals, "Unknown"));
+    offset += 1;
+    vp_length -= 1;
+
+    if (vp_length == 0)
+      break;
+    length = tvb_get_guint8(tvb, offset);
+    proto_tree_add_text(tree, tvb, offset, 1,
+		"Parameter length: %u", length);
+    offset += 1;
+    vp_length -= 1;
+
+    switch (code) {
+
+    case VP_ACK_TIME:
+      s = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, length,
+			      "Ack time (ms): %u", s);
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_RES_ERROR:
+      proto_tree_add_text(tree, tvb, offset, 1,
+		"Residual error rate, target value: 10^%u",
+		tvb_get_guint8(tvb, offset));
+      offset += 1;
+      length -= 1;
+      vp_length -= 1;
+
+      proto_tree_add_text(tree, tvb, offset, 1,
+		"Residual error rate, minimum acceptable: 10^%u",
+		tvb_get_guint8(tvb, offset));
+      offset += 1;
+      length -= 1;
+      vp_length -= 1;
+
+
+      proto_tree_add_text(tree, tvb, offset, 1,
+		"Residual error rate, TSDU size of interest: %u",
+		1<<tvb_get_guint8(tvb, offset));
+      offset += 1;
+      length -= 1;
+      vp_length -= 1;
+
+      break;
+
+    case VP_PRIORITY:
+      s = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, length,
+		"Priority: %u", s);
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_TRANSIT_DEL:
+      s1 = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Transit delay, target value, calling-called: %u ms", s1);
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+
+      s2 = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Transit delay, maximum acceptable, calling-called: %u ms", s2);
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+
+      s3 = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Transit delay, target value, called-calling: %u ms", s3);
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+
+      s4 = tvb_get_ntohs(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Transit delay, maximum acceptable, called-calling: %u ms", s4);
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+      break;
+
+    case VP_THROUGHPUT:
+      t1 = tvb_get_ntoh24(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 3,
+		"Maximum throughput, target value, calling-called:       %u o/s", t1);
+      offset += 3;
+      length -= 3;
+      vp_length -= 3;
+
+      t2 = tvb_get_ntoh24(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 3,
+		"Maximum throughput, minimum acceptable, calling-called: %u o/s", t2);
+      offset += 3;
+      length -= 3;
+      vp_length -= 3;
+
+      t3 = tvb_get_ntoh24(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 3,
+		"Maximum throughput, target value, called-calling:       %u o/s", t3);
+      offset += 3;
+      length -= 3;
+      vp_length -= 3;
+
+      t4 = tvb_get_ntoh24(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, 3,
+		"Maximum throughput, minimum acceptable, called-calling: %u o/s", t4);
+      offset += 3;
+      length -= 3;
+      vp_length -= 3;
+
+      if (length != 0) {	/* XXX - should be 0 or 12 */
+	t1 = tvb_get_ntoh24(tvb, offset);
+	proto_tree_add_text(tree, tvb, offset, 3,
+		"Average throughput, target value, calling-called:       %u o/s", t1);
+	offset += 3;
+	length -= 3;
+	vp_length -= 3;
+
+	t2 = tvb_get_ntoh24(tvb, offset);
+	proto_tree_add_text(tree, tvb, offset, 3,
+		"Average throughput, minimum acceptable, calling-called: %u o/s", t2);
+	offset += 3;
+	length -= 3;
+	vp_length -= 3;
+
+	t3 = tvb_get_ntoh24(tvb, offset);
+	proto_tree_add_text(tree, tvb, offset, 3,
+		"Average throughput, target value, called-calling:       %u o/s", t3);
+	offset += 3;
+	length -= 3;
+	vp_length -= 3;
+
+	t4 = tvb_get_ntoh24(tvb, offset);
+	proto_tree_add_text(tree, tvb, offset, 3,
+		"Average throughput, minimum acceptable, called-calling: %u o/s", t4);
+	offset += 3;
+	length -= 3;
+	vp_length -= 3;
+      }
+      break;
+
+    case VP_SEQ_NR:
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Sequence number: 0x%04x", tvb_get_ntohs(tvb, offset));
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_REASSIGNMENT:
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Reassignment time: %u secs", tvb_get_ntohs(tvb, offset));
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_FLOW_CNTL:
+      proto_tree_add_text(tree, tvb, offset, 4,
+		"Lower window edge: 0x%08x", tvb_get_ntohl(tvb, offset));
+      offset += 4;
+      length -= 4;
+      vp_length -= 4;
+
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Sequence number: 0x%04x", tvb_get_ntohs(tvb, offset));
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+
+      proto_tree_add_text(tree, tvb, offset, 2,
+		"Credit: 0x%04x", tvb_get_ntohs(tvb, offset));
+      offset += 2;
+      length -= 2;
+      vp_length -= 2;
+
+      break;
+
+    case VP_TPDU_SIZE:
+      c1 = tvb_get_guint8(tvb, offset) & 0x0F;
+      proto_tree_add_text(tree, tvb, offset, length,
+		"TPDU size: %u", 1 << c1);
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_SRC_TSAP:
+      /* if our preference is set to STRING or the  
+	 TSAP is not printable, add as bytes and hidden as string;
+         otherwise vice-versa */
+      if (tsap_display==TSAP_DISPLAY_STRING ||
+	 (tsap_display==TSAP_DISPLAY_AUTO && is_all_printable(tvb_get_ptr(tvb,offset,length),length))) {
+     	proto_tree_add_string(tree, hf_cotp_vp_src_tsap, tvb, offset, length, 
+		print_tsap(tvb_get_ptr(tvb, offset, length),length));
+        proto_tree_add_item_hidden(tree, hf_cotp_vp_src_tsap_bytes, tvb, offset, length, TRUE);
+      } else {
+     	proto_tree_add_string_hidden(tree, hf_cotp_vp_src_tsap, tvb, offset, length, 
+		print_tsap(tvb_get_ptr(tvb, offset, length),length));
+        proto_tree_add_item(tree, hf_cotp_vp_src_tsap_bytes, tvb, offset, length, TRUE);
+      }
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_DST_TSAP:
+      /* if our preference is set to STRING or the  
+	 TSAP is not printable, add as bytes and hidden as string;
+         otherwise vice-versa */      
+      if (tsap_display==TSAP_DISPLAY_STRING ||
+	 (tsap_display==TSAP_DISPLAY_AUTO && is_all_printable(tvb_get_ptr(tvb,offset,length),length))) {
+     	proto_tree_add_string(tree, hf_cotp_vp_dst_tsap, tvb, offset, length, 
+		print_tsap(tvb_get_ptr(tvb, offset, length),length));
+        proto_tree_add_item_hidden(tree, hf_cotp_vp_dst_tsap_bytes, tvb, offset, length, TRUE);
+      } else {
+     	proto_tree_add_string_hidden(tree, hf_cotp_vp_dst_tsap, tvb, offset, length, 
+		print_tsap(tvb_get_ptr(tvb, offset, length),length));
+        proto_tree_add_item(tree, hf_cotp_vp_dst_tsap_bytes, tvb, offset, length, TRUE);
+      }
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_CHECKSUM:
+      proto_tree_add_text(tree, tvb, offset, length,
+		"Checksum: 0x%04x", tvb_get_ntohs(tvb, offset));
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_VERSION_NR:
+      c1 = tvb_get_guint8(tvb, offset);
+      proto_tree_add_text(tree, tvb, offset, length,
+		"Version: %u", c1);
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_OPT_SEL:
+      c1 = tvb_get_guint8(tvb, offset) & 0x0F;
+      switch (class_option) {
+
+      case 1:
+	if (c1 & 0x8)
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Use of network expedited data");
+	else
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Non use of network expedited data");
+	if (c1 & 0x4)
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Use of Receipt confirmation");
+	else
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Use of explicit AK variant");
+	break;
+
+      case 4:
+	if (c1 & 0x2)
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Non-use 16 bit checksum in class 4");
+	else
+	  proto_tree_add_text(tree, tvb, offset, 1,
+				  "Use 16 bit checksum ");
+	break;
+      }
+      if (c1 & 0x1)
+	proto_tree_add_text(tree, tvb, offset, 1,
+				"Use of transport expedited data transfer");
+      else
+	proto_tree_add_text(tree, tvb, offset, 1,
+				"Non-use of transport expedited data transfer");
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_PREF_MAX_TPDU_SIZE:
+      switch (length) {
+
+      case 1:
+        pref_max_tpdu_size = tvb_get_guint8(tvb, offset);
+        break;
+
+      case 2:
+        pref_max_tpdu_size = tvb_get_ntohs(tvb, offset);
+        break;
+
+      case 3:
+	pref_max_tpdu_size = tvb_get_ntoh24(tvb, offset);
+	break;
+
+      case 4:
+        pref_max_tpdu_size = tvb_get_ntohl(tvb, offset);
+        break;
+
+      default:
+        proto_tree_add_text(tree, tvb, offset, length,
+		"Preferred maximum TPDU size: bogus length %u (not 1, 2, 3, or 4)",
+		length);
+	return FALSE;
+      }
+      proto_tree_add_text(tree, tvb, offset, length,
+		"Preferred maximum TPDU size: %u", pref_max_tpdu_size*128);
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_INACTIVITY_TIMER:
+      proto_tree_add_text(tree, tvb, offset, length,
+		"Inactivity timer: %u ms", tvb_get_ntohl(tvb, offset));
+      offset += length;
+      vp_length -= length;
+      break;
+
+    case VP_PROTECTION:           /* user-defined */
+    case VP_PROTO_CLASS:          /* todo */
+    default:			  /* unknown, no decoding */
+      proto_tree_add_text(tree, tvb, offset, length,
+			      "Parameter value: <not shown>");
+      offset += length;
+      vp_length -= length;
+      break;
+    }
+  } /* while */
+
+  return TRUE;
+}
+
+static int ositp_decode_DR(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree;
+  proto_item *ti;
+  guint16 dst_ref, src_ref;
+  guchar  reason;
+  char *str;
+
+  if (li < LI_MIN_DR)
+    return -1;
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+
+  src_ref = tvb_get_ntohs(tvb, offset + P_SRC_REF);
+
+  reason  = tvb_get_guint8(tvb, offset + P_REASON_IN_DR);
+
+  /* the settings of the TCP srcport and destport are currently disables,
+   * for the following reasons:
+   * a) only used for ISO conversation handling (which currently doesn't work)
+   * b) will prevent "ISO on TCP" (RFC1006) packets from using "follow TCP stream" correctly
+   *
+   * A future conversation handling might be able to handle different kinds of conversations
+   * (TCP, ISO, TCP on TCP, ...), but in that case this has to be fixed in any case.
+   */
+  /*pinfo->srcport = src_ref;*/
+  /*pinfo->destport = dst_ref;*/
+  switch(reason) {
+    case (128+0): str = "Normal Disconnect"; break;
+    case (128+1): str = "Remote transport entity congestion"; break;
+    case (128+2): str = "Connection negotiation failed"; break;
+    case (128+3): str = "Duplicate source reference"; break;
+    case (128+4): str = "Mismatched references"; break;
+    case (128+5): str = "Protocol error"; break;
+    case (128+7): str = "Reference overflow"; break;
+    case (128+8): str = "Connection requestion refused"; break;
+    case (128+10):str = "Header or parameter length invalid"; break;
+    case (0):     str = "Reason not specified"; break;
+    case (1):     str = "Congestion at TSAP"; break;
+    case (2):     str = "Session entity not attached to TSAP"; break;
+    case (3):     str = "Address unknown"; break;
+    default:      return -1;
+      /*NOTREACHED*/
+      break;
+  }
+
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO,
+		"DR TPDU src-ref: 0x%04x dst-ref: 0x%04x",
+		 src_ref, dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset,      1,
+			"Length indicator: %u", li);
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset +  1, 1, tpdu,
+			       "TPDU code: 0x%x (DR)", tpdu);
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset +  2, 2, dst_ref);
+    proto_tree_add_uint(cotp_tree, hf_cotp_srcref, tvb, offset +  4, 2, src_ref);
+    proto_tree_add_text(cotp_tree, tvb, offset +  6, 1,
+			"Cause: %s", str);
+  }
+
+  offset += li + 1;
+
+  /* User data */
+  call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
+  offset += tvb_length_remaining(tvb, offset);
+     /* we dissected all of the containing PDU */
+
+  return offset;
+
+} /* ositp_decode_DR */
+
+static int ositp_decode_DT(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree,
+			 gboolean uses_inactive_subset,
+			 gboolean *subdissector_found)
+{
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  gboolean is_extended;
+  gboolean is_class_234;
+  guint16  dst_ref;
+  guint    tpdu_nr;
+  guint    fragment = 0;
+  guint32  fragment_length = 0;
+  tvbuff_t *next_tvb;
+  tvbuff_t *reassembled_tvb = NULL;
+  fragment_data *fd_head;
+
+  /* VP_CHECKSUM is the only parameter allowed in the variable part.
+     (This means we may misdissect this if the packet is bad and
+     contains other parameters.) */
+  switch (li) {
+
+    case LI_NORMAL_DT_WITH_CHECKSUM      :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_NDT) != VP_CHECKSUM)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_NORMAL_DT_WITHOUT_CHECKSUM   :
+      tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
+      if ( tpdu_nr & 0x80 )
+	tpdu_nr = tpdu_nr & 0x7F;
+      else
+	fragment = 1;
+      is_extended = FALSE;
+      is_class_234 = TRUE;
+      dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+      break;
+
+    case LI_EXTENDED_DT_WITH_CHECKSUM    :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_EDT) != VP_CHECKSUM)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_EXTENDED_DT_WITHOUT_CHECKSUM :
+      tpdu_nr = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+      if ( tpdu_nr & 0x80000000 )
+	tpdu_nr = tpdu_nr & 0x7FFFFFFF;
+      else
+	fragment = 1;
+      is_extended = TRUE;
+      is_class_234 = TRUE;
+      dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+      break;
+
+    case LI_NORMAL_DT_CLASS_01           :
+      tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_0_1);
+      if ( tpdu_nr & 0x80 )
+	tpdu_nr = tpdu_nr & 0x7F;
+      else
+	fragment = 1;
+      is_extended = FALSE;
+      is_class_234 = FALSE;
+      dst_ref = 0;
+      break;
+
+    default : /* bad TPDU */
+      return -1;
+      /*NOTREACHED*/
+      break;
+  }
+
+  /* pinfo->destport = dst_ref; */
+  /* pinfo->srcport = 0; */
+  pinfo->fragmented = fragment;
+  if (check_col(pinfo->cinfo, COL_INFO)) {
+    if (is_class_234) {
+      col_append_fstr(pinfo->cinfo, COL_INFO, "DT TPDU (%u) dst-ref: 0x%04x %s",
+		 tpdu_nr,
+		 dst_ref,
+		 (fragment)? "(fragment)" : "");
+    } else {
+      col_append_fstr(pinfo->cinfo, COL_INFO, "DT TPDU (%u) %s",
+		 tpdu_nr,
+		 (fragment)? "(fragment)" : "");
+    }
+  }
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu, 
+			"TPDU code: 0x%x (DT)", tpdu);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (is_class_234) {
+    if (tree)
+      proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+    offset += 2;
+    li -= 2;
+  }
+
+  if (is_extended) {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 4,
+			    "TPDU number: 0x%08x (%s)",
+			    tpdu_nr,
+			    (fragment)? "fragment":"complete");
+    }
+    offset += 4;
+    li -= 4;
+  } else {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			    "TPDU number: 0x%02x (%s)",
+			    tpdu_nr,
+			    (fragment)? "fragment":"complete");
+    }
+    offset += 1;
+    li -= 1;
+  }
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+  offset += li;
+
+  next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+  if (cotp_reassemble) {
+    fragment_length = tvb_length(next_tvb);
+    /*
+     * XXX - these sequence numbers are connection sequence number,
+     * not segment sequence numbers - the first segment of a
+     * segmented packet doesn't have a specific sequence number (e.g., 0
+     * or 1), it has whatever the appropriate sequence number is for
+     * it in the connection.
+     *
+     * For now, we assume segments arrive in order, and just supply
+     * the negation of the EOT flag as the "more flags" argument.
+     * We should probably handle out-of-order packets separately,
+     * so that we can deliver them in order even when *not*
+     * reassembling.
+     *
+     * Note also that TP0 has no sequence number, and relies on
+     * the protocol atop which it runs to guarantee in-order delivery.
+     */
+    fd_head = fragment_add_seq_next(next_tvb, 0, pinfo, dst_ref,
+				     cotp_segment_table,
+				     cotp_reassembled_table,
+				     fragment_length, fragment);
+    if (fd_head) {
+      if (fd_head->next) {
+	/* This is the last packet */
+	reassembled_tvb = tvb_new_real_data(fd_head->data,
+					    fd_head->len,
+					    fd_head->len);
+	tvb_set_child_real_data_tvbuff(next_tvb, reassembled_tvb);
+	add_new_data_source(pinfo, reassembled_tvb, "Reassembled COTP");
+	
+	show_fragment_seq_tree(fd_head,
+			       &cotp_frag_items,
+			       cotp_tree,
+			       pinfo, reassembled_tvb);
+	pinfo->fragmented = fragment;
+	next_tvb = reassembled_tvb;
+      }
+    }
+    if (fragment && reassembled_tvb == NULL) {
+      proto_tree_add_text(cotp_tree, tvb, offset, -1,
+			  "User data (%u byte%s)", fragment_length,
+			  plurality(fragment_length, "", "s"));
+    } 
+
+  } 
+
+  if (uses_inactive_subset) {
+    if (dissector_try_heuristic(cotp_is_heur_subdissector_list, next_tvb,
+				pinfo, tree)) {
+      *subdissector_found = TRUE;
+    } else {
+      /* Fill in other Dissectors using inactive subset here */
+      call_dissector(data_handle,next_tvb, pinfo, tree);
+    }
+  } else {
+    /*
+     * We dissect payload if one of the following is TRUE: 
+     *
+     * - Reassembly option for COTP in preferences is unchecked 
+     * - Reassembly option is checked and this packet is the last fragment
+     */
+    if ( (!cotp_reassemble) ||
+	 ((cotp_reassemble) && (!fragment))) {
+      if (dissector_try_heuristic(cotp_heur_subdissector_list, next_tvb,
+				  pinfo, tree)) {
+        *subdissector_found = TRUE;
+      } else {
+        call_dissector(data_handle,next_tvb, pinfo, tree);
+      }
+    }
+  }   
+
+  offset += tvb_length_remaining(tvb, offset);
+     /* we dissected all of the containing PDU */
+
+  return offset;
+
+} /* ositp_decode_DT */
+
+static int ositp_decode_ED(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  gboolean is_extended;
+  guint16  dst_ref;
+  guint    tpdu_nr;
+  tvbuff_t *next_tvb;
+
+  /* ED TPDUs are never fragmented */
+
+  /* VP_CHECKSUM is the only parameter allowed in the variable part.
+     (This means we may misdissect this if the packet is bad and
+     contains other parameters.) */
+  switch (li) {
+
+    case LI_NORMAL_DT_WITH_CHECKSUM      :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_NDT) != VP_CHECKSUM)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_NORMAL_DT_WITHOUT_CHECKSUM   :
+      tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
+      if ( tpdu_nr & 0x80 )
+	tpdu_nr = tpdu_nr & 0x7F;
+      else
+	return -1;
+      is_extended = FALSE;
+      break;
+
+    case LI_EXTENDED_DT_WITH_CHECKSUM    :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_EDT) != VP_CHECKSUM)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_EXTENDED_DT_WITHOUT_CHECKSUM :
+      tpdu_nr = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+      if ( tpdu_nr & 0x80000000 )
+	tpdu_nr = tpdu_nr & 0x7FFFFFFF;
+      else
+	return -1;
+      is_extended = TRUE;
+      break;
+
+    default : /* bad TPDU */
+      return -1;
+      /*NOTREACHED*/
+      break;
+  } /* li */
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+
+  /* pinfo->destport = dst_ref; */
+  /* pinfo->srcport = 0; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO, "ED TPDU (%u) dst-ref: 0x%04x",
+		 tpdu_nr, dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu,
+			"TPDU code: 0x%x (ED)", tpdu);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+  offset += 2;
+  li -= 2;
+
+  if (is_extended) {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 4,
+			    "TPDU number: 0x%02x", tpdu_nr);
+    }
+    offset += 4;
+    li -= 4;
+  } else {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			    "TPDU number: 0x%02x", tpdu_nr);
+    }
+    offset += 1;
+    li -= 1;
+  }
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+  offset += li;
+
+  next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+  call_dissector(data_handle,next_tvb, pinfo, tree);
+
+  offset += tvb_length_remaining(tvb, offset);
+     /* we dissected all of the containing PDU */
+
+  return offset;
+
+} /* ositp_decode_ED */
+
+static int ositp_decode_RJ(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 guint8 cdt, packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree;
+  proto_item *ti;
+  guint16  dst_ref;
+  guint    tpdu_nr;
+  gushort  credit = 0;
+
+  switch(li) {
+    case LI_NORMAL_RJ   :
+      tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
+      break;
+    case LI_EXTENDED_RJ :
+      tpdu_nr = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+      credit = tvb_get_ntohs(tvb, offset + P_CDT_IN_RJ);
+      break;
+    default :
+      return -1;
+      /*NOTREACHED*/
+      break;
+  }
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+
+  /* pinfo->destport = dst_ref; */
+  /* pinfo->srcport = 0; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO, "RJ TPDU (%u) dst-ref: 0x%04x",
+		 tpdu_nr, dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset,      1,
+			"Length indicator: %u", li);
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset +  1, 1, tpdu,
+			"TPDU code: 0x%x (RJ)", tpdu);
+    if (li == LI_NORMAL_RJ)
+      proto_tree_add_text(cotp_tree, tvb, offset +  1, 1,
+			  "Credit: %u", cdt);
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset +  2, 2, dst_ref);
+    if (li == LI_NORMAL_RJ)
+      proto_tree_add_text(cotp_tree, tvb, offset +  4, 1,
+			  "Your TPDU number: 0x%02x", tpdu_nr);
+    else {
+      proto_tree_add_text(cotp_tree, tvb, offset +  4, 4,
+			  "Your TPDU number: 0x%02x", tpdu_nr);
+      proto_tree_add_text(cotp_tree, tvb, offset +  8, 2,
+			  "Credit: 0x%02x", credit);
+    }
+  }
+
+  offset += li + 1;
+
+  return offset;
+
+} /* ositp_decode_RJ */
+
+static int ositp_decode_CC(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree,
+			 gboolean uses_inactive_subset,
+			 gboolean *subdissector_found)
+{
+
+  /* CC & CR decoding in the same function */
+
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  guint16 dst_ref, src_ref;
+  guchar  class_option;
+  tvbuff_t *next_tvb;
+
+  src_ref = tvb_get_ntohs(tvb, offset + P_SRC_REF);
+  
+  class_option = (tvb_get_guint8(tvb, offset + P_CLASS_OPTION) >> 4 ) & 0x0F;
+  if (class_option > 4)
+    return -1;
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+  /* pinfo->srcport = src_ref; */
+  /* pinfo->destport = dst_ref; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO,
+		 "%s TPDU src-ref: 0x%04x dst-ref: 0x%04x",
+		 (tpdu == CR_TPDU) ? "CR" : "CC",
+		 src_ref,
+		 dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu,
+			"TPDU code: 0x%x (%s)", tpdu,
+			(tpdu == CR_TPDU) ? "CR" : "CC");
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+  offset += 2;
+  li -= 2;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_srcref, tvb, offset, 2, src_ref);
+  offset += 2;
+  li -= 2;
+
+  if (tree) {
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Class option: 0x%02x", class_option);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, class_option, cotp_tree);
+  offset += li;
+
+  next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+  if (!uses_inactive_subset){
+    if (dissector_try_heuristic(cotp_heur_subdissector_list, next_tvb,
+				pinfo, tree)) {
+      *subdissector_found = TRUE;
+    } else {
+      call_dissector(data_handle,next_tvb, pinfo, tree);
+    }
+  }
+  else
+    call_dissector(data_handle, next_tvb, pinfo, tree);
+  offset += tvb_length_remaining(tvb, offset);
+     /* we dissected all of the containing PDU */
+
+  return offset;
+
+} /* ositp_decode_CC */
+
+static int ositp_decode_DC(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  guint16 dst_ref, src_ref;
+
+  if (li > LI_MAX_DC)
+    return -1;
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+  src_ref = tvb_get_ntohs(tvb, offset + P_SRC_REF);
+
+  /* pinfo->srcport = src_ref; */
+  /* pinfo->destport = dst_ref; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO,
+		 "DC TPDU src-ref: 0x%04x dst-ref: 0x%04x",
+		 src_ref,
+		 dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu, 
+			"TPDU code: 0x%x (DC)", tpdu);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+  offset += 2;
+  li -= 2;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_srcref, tvb, offset, 2, src_ref);
+  offset += 2;
+  li -= 2;
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+  offset += li;
+
+  return offset;
+
+} /* ositp_decode_DC */
+
+static int ositp_decode_AK(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 guint8 cdt, packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  guint16    dst_ref;
+  guint      tpdu_nr;
+  gushort    cdt_in_ak;
+
+  if (li > LI_MAX_AK)
+    return -1;
+
+  if (is_LI_NORMAL_AK(li)) {
+
+    dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+    tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
+
+    /* pinfo->srcport = 0; */
+    /* pinfo->destport = dst_ref; */
+    if (check_col(pinfo->cinfo, COL_INFO))
+      col_append_fstr(pinfo->cinfo, COL_INFO, "AK TPDU (%u) dst-ref: 0x%04x",
+		   tpdu_nr, dst_ref);
+
+    if (tree) {
+      ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+      cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			  "Length indicator: %u", li);
+    }
+    offset += 1;
+
+    if (tree) {
+      proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu, 
+			  "TPDU code: 0x%x (AK)", tpdu);
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			  "Credit: %u", cdt);
+    }
+    offset += 1;
+    li -= 1;
+
+    if (tree)
+      proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+    offset += 2;
+    li -= 2;
+
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			  "Your TPDU number: 0x%02x", tpdu_nr);
+    }
+    offset += 1;
+    li -= 1;
+
+    if (tree)
+      ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+    offset += li;
+
+  } else { /* extended format */
+
+    dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+    tpdu_nr   = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+    cdt_in_ak = tvb_get_ntohs(tvb, offset + P_CDT_IN_AK);
+
+    if (check_col(pinfo->cinfo, COL_INFO))
+      col_append_fstr(pinfo->cinfo, COL_INFO, "AK TPDU (%u) dst-ref: 0x%04x",
+		   tpdu_nr, dst_ref);
+
+    if (tree) {
+      ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+      cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			  "Length indicator: %u", li);
+    }
+    offset += 1;
+
+    if (tree) {
+      proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu, 
+			  "TPDU code: 0x%x (AK)", tpdu);
+    }
+    offset += 1;
+    li -= 1;
+
+    if (tree)
+      proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+    offset += 2;
+    li -= 2;
+
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 4,
+			  "Your TPDU number: 0x%08x", tpdu_nr);
+    }
+    offset += 4;
+    li -= 4;
+
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 2,
+			  "Credit: 0x%04x", cdt_in_ak);
+    }
+    offset += 2;
+    li -= 2;
+
+    if (tree)
+      ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+    offset += li;
+
+  } /* is_LI_NORMAL_AK */
+
+  return offset;
+
+} /* ositp_decode_AK */
+
+static int ositp_decode_EA(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree = NULL;
+  proto_item *ti;
+  gboolean is_extended;
+  guint16  dst_ref;
+  guint    tpdu_nr;
+
+  if (li > LI_MAX_EA)
+    return -1;
+
+  /* VP_CHECKSUM is the only parameter allowed in the variable part.
+     (This means we may misdissect this if the packet is bad and
+     contains other parameters.) */
+  switch (li) {
+
+    case LI_NORMAL_EA_WITH_CHECKSUM      :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_NDT) != VP_CHECKSUM ||
+		tvb_get_guint8(tvb, offset + P_VAR_PART_NDT + 1) != 2)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_NORMAL_EA_WITHOUT_CHECKSUM   :
+      tpdu_nr = tvb_get_guint8(tvb, offset + P_TPDU_NR_234);
+      is_extended = FALSE;
+      break;
+
+    case LI_EXTENDED_EA_WITH_CHECKSUM    :
+      if (tvb_get_guint8(tvb, offset + P_VAR_PART_EDT) != VP_CHECKSUM ||
+		tvb_get_guint8(tvb, offset + P_VAR_PART_EDT + 1) != 2)
+	return -1;
+      /* FALLTHROUGH */
+
+    case LI_EXTENDED_EA_WITHOUT_CHECKSUM :
+      tpdu_nr = tvb_get_ntohl(tvb, offset + P_TPDU_NR_234);
+      is_extended = TRUE;
+      break;
+
+    default : /* bad TPDU */
+      return -1;
+      /*NOTREACHED*/
+      break;
+  } /* li */
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+  /* pinfo->srcport = 0; */
+  /* pinfo->destport = dst_ref; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO,
+		 "EA TPDU (%u) dst-ref: 0x%04x", tpdu_nr, dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset, 1, tpdu,
+			"TPDU code: 0x%x (EA)", tpdu);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset, 2, dst_ref);
+  offset += 2;
+  li -= 2;
+
+  if (is_extended) {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 4,
+			    "Your TPDU number: 0x%08x", tpdu_nr);
+    }
+    offset += 4;
+    li -= 4;
+  } else {
+    if (tree) {
+      proto_tree_add_text(cotp_tree, tvb, offset, 1,
+			    "Your TPDU number: 0x%02x", tpdu_nr);
+    }
+    offset += 1;
+    li -= 1;
+  }
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, 4, cotp_tree);
+  offset += li;
+
+  return offset;
+
+} /* ositp_decode_EA */
+
+static int ositp_decode_ER(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *cotp_tree;
+  proto_item *ti;
+  guchar *str;
+  guint16 dst_ref;
+
+  if (li > LI_MAX_ER)
+    return -1;
+
+  switch(tvb_get_guint8(tvb, offset + P_REJECT_ER)) {
+    case 0 :
+      str = "Reason not specified";
+      break;
+    case 1 :
+      str = "Invalid parameter code";
+      break;
+    case 2 :
+      str = "Invalid TPDU type";
+      break;
+    case 3 :
+      str = "Invalid parameter value";
+      break;
+    default:
+      return -1;
+      /*NOTREACHED*/
+      break;
+  }
+
+  dst_ref = tvb_get_ntohs(tvb, offset + P_DST_REF);
+  /* pinfo->srcport = 0; */
+  /* pinfo->destport = dst_ref; */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_fstr(pinfo->cinfo, COL_INFO, "ER TPDU dst-ref: 0x%04x", dst_ref);
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cotp, tvb, offset, li + 1, FALSE);
+    cotp_tree = proto_item_add_subtree(ti, ett_cotp);
+    proto_tree_add_text(cotp_tree, tvb, offset,      1,
+			"Length indicator: %u", li);
+    proto_tree_add_uint_format(cotp_tree, hf_cotp_type, tvb, offset +  1, 1, tpdu,
+			"TPDU code: 0x%x (ER)", tpdu);
+    proto_tree_add_uint(cotp_tree, hf_cotp_destref, tvb, offset +  2, 2, dst_ref);
+    proto_tree_add_text(cotp_tree, tvb, offset +  4, 1,
+			"Reject cause: %s", str);
+  }
+
+  offset += li + 1;
+
+  return offset;
+
+} /* ositp_decode_ER */
+
+static int ositp_decode_UD(tvbuff_t *tvb, int offset, guint8 li, guint8 tpdu,
+			 packet_info *pinfo, proto_tree *tree)
+{
+  proto_item *ti;
+  proto_tree *cltp_tree = NULL;
+  tvbuff_t   *next_tvb;
+
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_append_str(pinfo->cinfo, COL_INFO, "UD TPDU");
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_cltp, tvb, offset, li + 1, FALSE);
+    cltp_tree = proto_item_add_subtree(ti, ett_cltp);
+    proto_tree_add_text(cltp_tree, tvb, offset, 1,
+			"Length indicator: %u", li);
+  }
+  offset += 1;
+
+  if (tree) {
+    proto_tree_add_uint_format(cltp_tree, hf_cltp_type, tvb, offset, 1, tpdu, 
+			"TPDU code: 0x%x (UD)", tpdu);
+  }
+  offset += 1;
+  li -= 1;
+
+  if (tree)
+    ositp_decode_var_part(tvb, offset, li, 0, cltp_tree);
+  offset += li;
+
+  next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+  call_dissector(data_handle,next_tvb, pinfo, tree);
+  offset += tvb_length_remaining(tvb, offset);
+     /* we dissected all of the containing PDU */
+
+  return offset;
+
+} /* ositp_decode_UD */
+
+/* Returns TRUE if we found at least one valid COTP or CLTP PDU, FALSE
+   otherwise.
+
+   There doesn't seem to be any way in which the OSI network layer protocol
+   distinguishes between COTP and CLTP, but the first two octets of both
+   protocols' headers mean the same thing - length and PDU type - and the
+   only valid CLTP PDU type is not a valid COTP PDU type, so we'll handle
+   both of them here. */
+static gboolean dissect_ositp_internal(tvbuff_t *tvb, packet_info *pinfo,
+		  proto_tree *tree, gboolean uses_inactive_subset)
+{
+  int offset = 0;
+  guint8 li, tpdu, cdt;
+  gboolean first_tpdu = TRUE;
+  int new_offset;
+  gboolean found_ositp = FALSE;
+  gboolean is_cltp = FALSE;
+  gboolean subdissector_found = FALSE;
+
+  if (!proto_is_protocol_enabled(find_protocol_by_id(proto_cotp)))
+    return FALSE;	/* COTP has been disabled */
+  /* XXX - what about CLTP? */
+
+  pinfo->current_proto = "COTP";
+
+  /* Initialize the COL_INFO field; each of the TPDUs will have its
+     information appended. */
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_add_str(pinfo->cinfo, COL_INFO, "");
+
+  while (tvb_offset_exists(tvb, offset)) {
+    if (!first_tpdu) {
+      if (check_col(pinfo->cinfo, COL_INFO))
+        col_append_str(pinfo->cinfo, COL_INFO, ", ");
+    }
+    if ((li = tvb_get_guint8(tvb, offset + P_LI)) == 0) {
+      if (check_col(pinfo->cinfo, COL_INFO))
+        col_append_str(pinfo->cinfo, COL_INFO, "Length indicator is zero");
+      if (!first_tpdu)
+        call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1),
+                       pinfo, tree);
+      return found_ositp;
+    }
+
+    tpdu    = (tvb_get_guint8(tvb, offset + P_TPDU) >> 4) & 0x0F;
+    if (tpdu == UD_TPDU)
+      pinfo->current_proto = "CLTP";	/* connectionless transport */
+    cdt     = tvb_get_guint8(tvb, offset + P_CDT) & 0x0F;
+
+    switch (tpdu) {
+      case CC_TPDU :
+      case CR_TPDU :
+        new_offset = ositp_decode_CC(tvb, offset, li, tpdu, pinfo, tree,
+				     uses_inactive_subset, &subdissector_found);
+        break;
+      case DR_TPDU :
+        new_offset = ositp_decode_DR(tvb, offset, li, tpdu, pinfo, tree);
+        break;
+      case DT_TPDU :
+        new_offset = ositp_decode_DT(tvb, offset, li, tpdu, pinfo, tree,
+				   uses_inactive_subset, &subdissector_found);
+        break;
+      case ED_TPDU :
+        new_offset = ositp_decode_ED(tvb, offset, li, tpdu, pinfo, tree);
+        break;
+      case RJ_TPDU :
+        new_offset = ositp_decode_RJ(tvb, offset, li, tpdu, cdt, pinfo, tree);
+        break;
+      case DC_TPDU :
+        new_offset = ositp_decode_DC(tvb, offset, li, tpdu, pinfo, tree);
+        break;
+      case AK_TPDU :
+        new_offset = ositp_decode_AK(tvb, offset, li, tpdu, cdt, pinfo, tree);
+        break;
+      case EA_TPDU :
+        new_offset = ositp_decode_EA(tvb, offset, li, tpdu, pinfo, tree);
+        break;
+      case ER_TPDU :
+        new_offset = ositp_decode_ER(tvb, offset, li, tpdu, pinfo, tree);
+        break;
+      case UD_TPDU :
+        new_offset = ositp_decode_UD(tvb, offset, li, tpdu, pinfo, tree);
+        is_cltp = TRUE;
+        break;
+      default      :
+        if (first_tpdu && check_col(pinfo->cinfo, COL_INFO))
+          col_append_fstr(pinfo->cinfo, COL_INFO, "Unknown TPDU type (0x%x)", tpdu);
+        new_offset = -1;	/* bad PDU type */
+        break;
+    }
+
+    if (new_offset == -1) { /* incorrect TPDU */
+      if (!first_tpdu)
+        call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1),
+                       pinfo, tree);
+      break;
+    }
+
+    if (first_tpdu) {
+      /* Well, we found at least one valid COTP or CLTP PDU, so I guess this
+         is either COTP or CLTP. */
+      if (!subdissector_found && check_col(pinfo->cinfo, COL_PROTOCOL))
+        col_set_str(pinfo->cinfo, COL_PROTOCOL, is_cltp ? "CLTP" : "COTP");
+      found_ositp = TRUE;
+    }
+
+    offset = new_offset;
+    first_tpdu = FALSE;
+  }
+  return found_ositp;
+} /* dissect_ositp_internal */
+
+static void dissect_ositp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  if (!dissect_ositp_internal(tvb, pinfo, tree, FALSE))
+    call_dissector(data_handle,tvb, pinfo, tree);
+}
+
+/*
+ *  CLNP part / main entry point
+*/
+
+static void dissect_clnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  proto_tree *clnp_tree = NULL;
+  proto_item *ti;
+  guint8      cnf_proto_id;
+  guint8      cnf_hdr_len;
+  guint8      cnf_vers;
+  guint8      cnf_ttl;
+  guint8      cnf_type;
+  char        flag_string[6+1];
+  char       *pdu_type_string;
+  proto_tree *type_tree;
+  guint16     segment_length;
+  guint16     du_id = 0;
+  guint16     segment_offset = 0;
+  guint16     cnf_cksum;
+  cksum_status_t cksum_status;
+  int         offset;
+  guchar      src_len, dst_len, nsel, opt_len = 0;
+  const guint8     *dst_addr, *src_addr;
+  gint        len;
+  guint       next_length;
+  proto_tree *discpdu_tree;
+  gboolean    save_in_error_pkt;
+  fragment_data *fd_head;
+  tvbuff_t   *next_tvb;
+  gboolean    update_col_info = TRUE;
+  gboolean    save_fragmented;
+
+  if (check_col(pinfo->cinfo, COL_PROTOCOL))
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "CLNP");
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_clear(pinfo->cinfo, COL_INFO);
+
+  cnf_proto_id = tvb_get_guint8(tvb, P_CLNP_PROTO_ID);
+  if (cnf_proto_id == NLPID_NULL) {
+    if (check_col(pinfo->cinfo, COL_INFO))
+      col_set_str(pinfo->cinfo, COL_INFO, "Inactive subset");
+    if (tree) {
+      ti = proto_tree_add_item(tree, proto_clnp, tvb, P_CLNP_PROTO_ID, 1, FALSE);
+      clnp_tree = proto_item_add_subtree(ti, ett_clnp);
+      proto_tree_add_uint_format(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
+				 cnf_proto_id,
+				 "Inactive subset");
+    }
+    next_tvb = tvb_new_subset(tvb, 1, -1, -1);
+    dissect_ositp_internal(next_tvb, pinfo, tree, TRUE);
+    return;
+  }
+
+  /* return if version not known */
+  cnf_vers = tvb_get_guint8(tvb, P_CLNP_VERS);
+  if (cnf_vers != ISO8473_V1) {
+    call_dissector(data_handle,tvb, pinfo, tree);
+    return;
+  }
+
+  /* fixed part decoding */
+  cnf_hdr_len = tvb_get_guint8(tvb, P_CLNP_HDR_LEN);
+  opt_len = cnf_hdr_len;
+
+  if (tree) {
+    ti = proto_tree_add_item(tree, proto_clnp, tvb, 0, cnf_hdr_len, FALSE);
+    clnp_tree = proto_item_add_subtree(ti, ett_clnp);
+    proto_tree_add_uint(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
+			       cnf_proto_id);
+    proto_tree_add_uint(clnp_tree, hf_clnp_length, tvb, P_CLNP_HDR_LEN, 1,
+			cnf_hdr_len);
+    proto_tree_add_uint(clnp_tree, hf_clnp_version, tvb, P_CLNP_VERS, 1,
+			cnf_vers);
+    cnf_ttl = tvb_get_guint8(tvb, P_CLNP_TTL);
+    proto_tree_add_uint_format(clnp_tree, hf_clnp_ttl, tvb, P_CLNP_TTL, 1,
+			       cnf_ttl,
+			       "Holding Time : %u (%u.%u secs)",
+			       cnf_ttl, cnf_ttl / 2, (cnf_ttl % 2) * 5);
+  }
+
+  cnf_type = tvb_get_guint8(tvb, P_CLNP_TYPE);
+  pdu_type_string = val_to_str(cnf_type & CNF_TYPE, npdu_type_abbrev_vals,
+				"Unknown (0x%02x)");
+  flag_string[0] = '\0';
+  if (cnf_type & CNF_SEG_OK)
+    strcat(flag_string, "S ");
+  if (cnf_type & CNF_MORE_SEGS)
+    strcat(flag_string, "M ");
+  if (cnf_type & CNF_ERR_OK)
+    strcat(flag_string, "E ");
+  if (tree) {
+    ti = proto_tree_add_uint_format(clnp_tree, hf_clnp_type, tvb, P_CLNP_TYPE, 1,
+			       cnf_type,
+			       "PDU Type     : 0x%02x (%s%s)",
+			       cnf_type,
+			       flag_string,
+			       pdu_type_string);
+    type_tree = proto_item_add_subtree(ti, ett_clnp_type);
+    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
+			decode_boolean_bitfield(cnf_type, CNF_SEG_OK, 8,
+				      "Segmentation permitted",
+				      "Segmentation not permitted"));
+    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
+			decode_boolean_bitfield(cnf_type, CNF_MORE_SEGS, 8,
+				      "More segments",
+				      "Last segment"));
+    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
+			decode_boolean_bitfield(cnf_type, CNF_ERR_OK, 8,
+				      "Report error if PDU discarded",
+				      "Don't report error if PDU discarded"));
+    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
+			decode_enumerated_bitfield(cnf_type, CNF_TYPE, 8,
+				      npdu_type_vals, "%s"));
+  }
+
+  /* If we don't have the full header - i.e., not enough to see the
+     segmentation part and determine whether this datagram is segmented
+     or not - set the Info column now; we'll get an exception before
+     we set it otherwise. */
+
+  if (!tvb_bytes_exist(tvb, 0, cnf_hdr_len)) {
+    if (check_col(pinfo->cinfo, COL_INFO))
+      col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
+  }
+
+  segment_length = tvb_get_ntohs(tvb, P_CLNP_SEGLEN);
+  cnf_cksum = tvb_get_ntohs(tvb, P_CLNP_CKSUM);
+  cksum_status = calc_checksum(tvb, 0, cnf_hdr_len, cnf_cksum);
+  if (tree) {
+    proto_tree_add_uint(clnp_tree, hf_clnp_pdu_length, tvb, P_CLNP_SEGLEN, 2,
+			segment_length);
+    switch (cksum_status) {
+
+    default:
+	/*
+	 * No checksum present, or not enough of the header present to
+	 * checksum it.
+	 */
+	proto_tree_add_uint_format(clnp_tree, hf_clnp_checksum, tvb,
+			       P_CLNP_CKSUM, 2,
+			       cnf_cksum,
+			       "Checksum     : 0x%04x",
+			       cnf_cksum);
+	break;
+
+    case CKSUM_OK:
+	/*
+	 * Checksum is correct.
+	 */
+	proto_tree_add_uint_format(clnp_tree, hf_clnp_checksum, tvb,
+			       P_CLNP_CKSUM, 2,
+			       cnf_cksum,
+			       "Checksum     : 0x%04x (correct)",
+			       cnf_cksum);
+	break;
+
+    case CKSUM_NOT_OK:
+	/*
+	 * Checksum is not correct.
+	 */
+	proto_tree_add_uint_format(clnp_tree, hf_clnp_checksum, tvb,
+			       P_CLNP_CKSUM, 2,
+			       cnf_cksum,
+			       "Checksum     : 0x%04x (incorrect)",
+			       cnf_cksum);
+	break;
+    }
+    opt_len -= 9; /* Fixed part of Hesder */
+  } /* tree */
+
+  /* address part */
+
+  offset = P_CLNP_ADDRESS_PART;
+  dst_len  = tvb_get_guint8(tvb, offset);
+  dst_addr = tvb_get_ptr(tvb, offset + 1, dst_len);
+  nsel     = tvb_get_guint8(tvb, offset + dst_len);
+  src_len  = tvb_get_guint8(tvb, offset + dst_len + 1);
+  src_addr = tvb_get_ptr(tvb, offset + dst_len + 2, src_len);
+
+  if (tree) {
+    proto_tree_add_uint(clnp_tree, hf_clnp_dest_length, tvb, offset, 1,
+			dst_len);
+    proto_tree_add_bytes_format(clnp_tree, hf_clnp_dest, tvb, offset + 1 , dst_len,
+			       dst_addr,
+			       " DA : %s",
+			       print_nsap_net(dst_addr, dst_len));
+    proto_tree_add_uint(clnp_tree, hf_clnp_src_length, tvb,
+			offset + 1 + dst_len, 1, src_len);
+    proto_tree_add_bytes_format(clnp_tree, hf_clnp_src, tvb,
+			       offset + dst_len + 2, src_len,
+			       src_addr,
+			       " SA : %s",
+			       print_nsap_net(src_addr, src_len));
+
+    opt_len -= dst_len + src_len +2;
+  }
+
+  SET_ADDRESS(&pinfo->net_src, AT_OSI, src_len, src_addr);
+  SET_ADDRESS(&pinfo->src, AT_OSI, src_len, src_addr);
+  SET_ADDRESS(&pinfo->net_dst, AT_OSI, dst_len, dst_addr);
+  SET_ADDRESS(&pinfo->dst, AT_OSI, dst_len, dst_addr);
+
+  /* Segmentation Part */
+
+  offset += dst_len + src_len + 2;
+
+  if (cnf_type & CNF_SEG_OK) {
+    struct clnp_segment seg;			/* XXX - not used */
+    tvb_memcpy(tvb, (guint8 *)&seg, offset, sizeof(seg));	/* XXX - not used */
+
+    segment_offset = tvb_get_ntohs(tvb, offset + 2);
+    du_id = tvb_get_ntohs(tvb, offset);
+    if (tree) {
+      proto_tree_add_text(clnp_tree, tvb, offset, 2,
+			"Data unit identifier: %06u",
+			du_id);
+      proto_tree_add_text(clnp_tree, tvb, offset + 2 , 2,
+			"Segment offset      : %6u",
+			segment_offset);
+      proto_tree_add_text(clnp_tree, tvb, offset + 4 , 2,
+			"Total length        : %6u",
+			tvb_get_ntohs(tvb, offset + 4));
+    }
+
+    offset  += 6;
+    opt_len -= 6;
+  }
+
+  if (tree) {
+    /* To do : decode options  */
+/*
+    proto_tree_add_text(clnp_tree, tvb, offset,
+			cnf_hdr_len - offset,
+			"Options/Data: <not shown>");
+*/
+/* QUICK HACK Option Len:= PDU_Hd_length-( FixedPart+AddresPart+SegmentPart )*/
+
+    dissect_osi_options( opt_len,
+                         tvb, offset, clnp_tree );
+  }
+
+  /* Length of CLNP datagram plus headers above it. */
+  len = segment_length;
+
+  offset = cnf_hdr_len;
+
+  /* If clnp_reassemble is on, this is a segment, we have all the
+   * data in the segment, and the checksum is valid, then just add the
+   * segment to the hashtable.
+   */
+  save_fragmented = pinfo->fragmented;
+  if (clnp_reassemble && (cnf_type & CNF_SEG_OK) &&
+	((cnf_type & CNF_MORE_SEGS) || segment_offset != 0) &&
+	tvb_bytes_exist(tvb, offset, segment_length - cnf_hdr_len) &&
+	cksum_status != CKSUM_NOT_OK) {
+    fd_head = fragment_add_check(tvb, offset, pinfo, du_id, clnp_segment_table,
+			   clnp_reassembled_table, segment_offset,
+			   segment_length - cnf_hdr_len,
+			   cnf_type & CNF_MORE_SEGS);
+
+    next_tvb = process_reassembled_data(tvb, offset, pinfo, "Reassembled CLNP",
+        fd_head, &clnp_frag_items, &update_col_info, clnp_tree);
+  } else {
+    /* If this is the first segment, dissect its contents, otherwise
+       just show it as a segment.
+
+       XXX - if we eventually don't save the reassembled contents of all
+       segmented datagrams, we may want to always reassemble. */
+    if ((cnf_type & CNF_SEG_OK) && segment_offset != 0) {
+      /* Not the first segment - don't dissect it. */
+      next_tvb = NULL;
+    } else {
+      /* First segment, or not segmented.  Dissect what we have here. */
+
+      /* Get a tvbuff for the payload. */
+      next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+
+      /*
+       * If this is the first segment, but not the only segment,
+       * tell the next protocol that.
+       */
+      if ((cnf_type & (CNF_SEG_OK|CNF_MORE_SEGS)) == (CNF_SEG_OK|CNF_MORE_SEGS))
+        pinfo->fragmented = TRUE;
+      else
+        pinfo->fragmented = FALSE;
+    }
+  }
+
+  if (next_tvb == NULL) {
+    /* Just show this as a segment. */
+    if (check_col(pinfo->cinfo, COL_INFO))
+      col_add_fstr(pinfo->cinfo, COL_INFO, "Fragmented %s NPDU %s(off=%u)",
+		pdu_type_string, flag_string, segment_offset);
+
+    /* As we haven't reassembled anything, we haven't changed "pi", so
+       we don't have to restore it. */
+    call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo,
+                   tree);
+    pinfo->fragmented = save_fragmented;
+    return;
+  }
+
+  if (tvb_offset_exists(tvb, offset)) {
+    switch (cnf_type & CNF_TYPE) {
+
+    case DT_NPDU:
+    case MD_NPDU:
+      /* Continue with COTP if any data.
+         XXX - if this isn't the first Derived PDU of a segmented Initial
+         PDU, skip that? */
+
+      if (nsel == (char)tp_nsap_selector || always_decode_transport) {
+        if (dissect_ositp_internal(next_tvb, pinfo, tree, FALSE)) {
+          pinfo->fragmented = save_fragmented;
+          return;	/* yes, it appears to be COTP or CLTP */
+        }
+      }
+      if (dissector_try_heuristic(clnp_heur_subdissector_list, next_tvb,
+				  pinfo, tree))	{
+          pinfo->fragmented = save_fragmented;
+          return;	/* yes, it appears to be COTP or CLTP */
+      }
+	
+      break;
+
+    case ER_NPDU:
+      /* The payload is the header and "none, some, or all of the data
+         part of the discarded PDU", i.e. it's like an ICMP error;
+	 dissect it as a CLNP PDU. */
+      if (check_col(pinfo->cinfo, COL_INFO))
+        col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
+      if (tree) {
+        next_length = tvb_length_remaining(tvb, offset);
+        if (next_length != 0) {
+          /* We have payload; dissect it. */
+          ti = proto_tree_add_text(clnp_tree, tvb, offset, next_length,
+            "Discarded PDU");
+          discpdu_tree = proto_item_add_subtree(ti, ett_clnp_disc_pdu);
+
+          /* Save the current value of the "we're inside an error packet"
+             flag, and set that flag; subdissectors may treat packets
+             that are the payload of error packets differently from
+             "real" packets. */
+          save_in_error_pkt = pinfo->in_error_pkt;
+          pinfo->in_error_pkt = TRUE;
+
+          call_dissector(clnp_handle, next_tvb, pinfo, discpdu_tree);
+
+          /* Restore the "we're inside an error packet" flag. */
+          pinfo->in_error_pkt = save_in_error_pkt;
+        }
+      }
+      pinfo->fragmented = save_fragmented;
+      return;	/* we're done with this PDU */
+
+    case ERQ_NPDU:
+    case ERP_NPDU:
+      /* XXX - dissect this */
+      break;
+    }
+  }
+  if (check_col(pinfo->cinfo, COL_INFO))
+    col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
+  call_dissector(data_handle,next_tvb, pinfo, tree);
+  pinfo->fragmented = save_fragmented;
+} /* dissect_clnp */
+
+static void
+clnp_reassemble_init(void)
+{
+  fragment_table_init(&clnp_segment_table);
+  reassembled_table_init(&clnp_reassembled_table);
+}
+
+static void
+cotp_reassemble_init(void)
+{
+  fragment_table_init(&cotp_segment_table);
+  reassembled_table_init(&cotp_reassembled_table);
+}
+
+void proto_register_clnp(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_clnp_id,
+      { "Network Layer Protocol Identifier", "clnp.nlpi", FT_UINT8, BASE_HEX,
+        VALS(nlpid_vals), 0x0, "", HFILL }},
+
+    { &hf_clnp_length,
+      { "HDR Length   ", "clnp.len",	   FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_version,
+      { "Version      ", "clnp.version",  FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_ttl,
+      { "Holding Time ", "clnp.ttl",	   FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_type,
+      { "PDU Type     ", "clnp.type",     FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_pdu_length,
+      { "PDU length   ", "clnp.pdu.len",  FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_checksum,
+      { "Checksum     ", "clnp.checksum", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_dest_length,
+      { "DAL ", "clnp.dsap.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_dest,
+      { " DA ", "clnp.dsap",     FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_src_length,
+      { "SAL ", "clnp.ssap.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_src,
+      { " SA ", "clnp.ssap",     FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL }},
+
+    { &hf_clnp_segment_overlap,
+      { "Segment overlap", "clnp.segment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Segment overlaps with other segments", HFILL }},
+
+    { &hf_clnp_segment_overlap_conflict,
+      { "Conflicting data in segment overlap", "clnp.segment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Overlapping segments contained conflicting data", HFILL }},
+
+    { &hf_clnp_segment_multiple_tails,
+      { "Multiple tail segments found", "clnp.segment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Several tails were found when reassembling the packet", HFILL }},
+
+    { &hf_clnp_segment_too_long_segment,
+      { "Segment too long", "clnp.segment.toolongsegment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Segment contained data past end of packet", HFILL }},
+
+    { &hf_clnp_segment_error,
+      { "Reassembly error", "clnp.segment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"Reassembly error due to illegal segments", HFILL }},
+
+    { &hf_clnp_segment,
+      { "CLNP Segment", "clnp.segment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"CLNP Segment", HFILL }},
+
+    { &hf_clnp_segments,
+      { "CLNP Segments", "clnp.segments", FT_NONE, BASE_DEC, NULL, 0x0,
+	"CLNP Segments", HFILL }},
+
+    { &hf_clnp_reassembled_in,
+      { "Reassembled CLNP in frame", "clnp.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"This CLNP packet is reassembled in this frame", HFILL }}
+  };
+  static gint *ett[] = {
+    &ett_clnp,
+    &ett_clnp_type,
+    &ett_clnp_segments,
+    &ett_clnp_segment,
+    &ett_clnp_disc_pdu,
+  };
+
+  module_t *clnp_module;
+
+  proto_clnp = proto_register_protocol(PROTO_STRING_CLNP, "CLNP", "clnp");
+  proto_register_field_array(proto_clnp, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+  register_dissector("clnp", dissect_clnp, proto_clnp);
+  register_heur_dissector_list("clnp", &clnp_heur_subdissector_list);  
+  register_init_routine(clnp_reassemble_init);
+  register_init_routine(cotp_reassemble_init);
+
+  clnp_module = prefs_register_protocol(proto_clnp, NULL);
+  prefs_register_uint_preference(clnp_module, "tp_nsap_selector",
+	"NSAP selector for Transport Protocol (last byte in hex)",
+	"NSAP selector for Transport Protocol (last byte in hex)",
+       	16, &tp_nsap_selector);
+  prefs_register_bool_preference(clnp_module, "always_decode_transport",
+	"Always try to decode NSDU as transport PDUs",
+	"Always try to decode NSDU as transport PDUs",
+       	&always_decode_transport);
+  prefs_register_bool_preference(clnp_module, "reassemble",
+	"Reassemble segmented CLNP datagrams",
+	"Whether segmented CLNP datagrams should be reassembled",
+	&clnp_reassemble);
+}
+
+void
+proto_reg_handoff_clnp(void)
+{
+  data_handle = find_dissector("data");
+
+  clnp_handle = create_dissector_handle(dissect_clnp, proto_clnp);
+  dissector_add("osinl", NLPID_ISO8473_CLNP, clnp_handle);
+  dissector_add("osinl", NLPID_NULL, clnp_handle); /* Inactive subset */
+  dissector_add("x.25.spi", NLPID_ISO8473_CLNP, clnp_handle);
+}
+
+void proto_register_cotp(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_cotp_srcref,
+      { "Source reference", "cotp.srcref", FT_UINT16, BASE_HEX, NULL, 0x0,
+        "Source address reference", HFILL}},
+    { &hf_cotp_destref,
+      { "Destination reference", "cotp.destref", FT_UINT16, BASE_HEX, NULL, 0x0,
+        "Destination address reference", HFILL}}, 
+    { &hf_cotp_type,
+      { "COTP PDU Type", "cotp.type", FT_UINT8, BASE_HEX, VALS(cotp_tpdu_type_abbrev_vals), 0x0,
+        "COTP PDU Type", HFILL}},
+    { &hf_cotp_segment_overlap,
+      { "Segment overlap", "cotp.segment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Segment overlaps with other segments", HFILL }},
+    { &hf_cotp_segment_overlap_conflict,
+      { "Conflicting data in segment overlap", "cotp.segment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Overlapping segments contained conflicting data", HFILL }},
+    { &hf_cotp_segment_multiple_tails,
+      { "Multiple tail segments found", "cotp.segment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Several tails were found when reassembling the packet", HFILL }},
+    { &hf_cotp_segment_too_long_segment,
+      { "Segment too long", "cotp.segment.toolongsegment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+	"Segment contained data past end of packet", HFILL }},
+    { &hf_cotp_segment_error,
+      { "Reassembly error", "cotp.segment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"Reassembly error due to illegal segments", HFILL }},
+    { &hf_cotp_segment,
+      { "COTP Segment", "cotp.segment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"COTP Segment", HFILL }},
+    { &hf_cotp_segments,
+      { "COTP Segments", "cotp.segments", FT_NONE, BASE_DEC, NULL, 0x0,
+	"COTP Segments", HFILL }},
+    { &hf_cotp_reassembled_in,
+      { "Reassembled COTP in frame", "cotp.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+	"This COTP packet is reassembled in this frame", HFILL }},
+/* ISO DP 8073 i13.3.4(a) Source and destination TSAPs are defined as
+   identifiers of unspecified type and length.
+   Some implementations of COTP use printable strings, others use raw bytes.
+   We always add both representations to the tree; one will always be hidden
+   depending on the tsap display preference */
+    { &hf_cotp_vp_src_tsap,
+      { "Source TSAP", "cotp.src-tsap", FT_STRING, BASE_NONE, NULL, 0x0,
+        "Calling TSAP", HFILL }},
+    { &hf_cotp_vp_src_tsap_bytes,
+      { "Source TSAP", "cotp.src-tsap-bytes", FT_BYTES, BASE_NONE, NULL, 0x0,
+        "Calling TSAP (bytes representation)", HFILL }},
+    { &hf_cotp_vp_dst_tsap,
+      { "Destination TSAP", "cotp.dst-tsap", FT_STRING, BASE_NONE, NULL, 0x0,
+	"Called TSAP", HFILL }},
+    { &hf_cotp_vp_dst_tsap_bytes,
+      { "Destination TSAP", "cotp.dst-tsap-bytes", FT_BYTES, BASE_NONE, NULL, 0x0,
+	"Called TSAP (bytes representation)", HFILL }},
+
+  };
+  static gint *ett[] = {
+	&ett_cotp,
+	&ett_cotp_segment,
+	&ett_cotp_segments,
+  };
+
+  module_t *cotp_module;
+
+  proto_cotp = proto_register_protocol(PROTO_STRING_COTP, "COTP", "cotp");
+  proto_register_field_array(proto_cotp, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+  cotp_module = prefs_register_protocol(proto_cotp, NULL);
+
+  prefs_register_bool_preference(cotp_module, "reassemble",
+	 "Reassemble segmented COTP datagrams",
+	 "Whether segmented COTP datagrams should be reassembled",
+	&cotp_reassemble);
+
+  prefs_register_enum_preference(cotp_module, "tsap_display",
+	 "Display TSAPs as strings or bytes",
+	 "How TSAPs should be displayed",
+	&tsap_display,
+	tsap_display_options,
+	FALSE);
+
+  /* subdissector code in inactive subset */
+  register_heur_dissector_list("cotp_is", &cotp_is_heur_subdissector_list);
+
+  /* other COTP/ISO 8473 subdissectors */
+  register_heur_dissector_list("cotp", &cotp_heur_subdissector_list);
+
+  /* XXX - what about CLTP and proto_cltp? */
+  register_dissector("ositp", dissect_ositp, proto_cotp);
+}
+
+void
+proto_reg_handoff_cotp(void)
+{
+  dissector_handle_t ositp_handle;
+
+  ositp_handle = find_dissector("ositp");
+  dissector_add("ip.proto", IP_PROTO_TP, ositp_handle);
+}
+
+void proto_register_cltp(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_cltp_type,
+      { "CLTP PDU Type", "cltp.type", FT_UINT8, BASE_HEX, VALS(cltp_tpdu_type_abbrev_vals), 0x0,
+        "CLTP PDU Type", HFILL}},
+  };
+  static gint *ett[] = {
+	&ett_cltp,
+  };
+
+  proto_cltp = proto_register_protocol(PROTO_STRING_CLTP, "CLTP", "cltp");
+  proto_register_field_array(proto_cltp, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+}
-- 
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