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wireshark/epan/dissectors/packet-clnp.c

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/* packet-clnp.c
* Routines for ISO/OSI network protocol packet disassembly
*
* $Id$
* Laurent Deniel <laurent.deniel@free.fr>
* Ralf Schneider <Ralf.Schneider@t-online.de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <epan/prefs.h>
#include <epan/packet.h>
#include <epan/reassemble.h>
#include "packet-frame.h"
#include "packet-osi.h"
#include "packet-osi-options.h"
#include "packet-isis.h"
#include "packet-esis.h"
#include <epan/nlpid.h>
#include <epan/ipproto.h>
#include <epan/expert.h>
#include <epan/strutil.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 const true_false_string fragment_descriptions = {
"Yes",
"No"
};
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 dissector_handle_t clnp_handle;
static dissector_handle_t ositp_handle;
static dissector_handle_t ositp_inactive_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
/* global variables */
/* 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;
/* options */
static guint tp_nsap_selector = NSEL_TP;
static gboolean always_decode_transport = FALSE;
static gboolean clnp_reassemble = TRUE;
/* function definitions */
/*
* 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];
const 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);
if (call_dissector(ositp_inactive_handle, next_tvb, pinfo, tree) == 0)
call_dissector(data_handle,tvb, pinfo, tree);
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)
g_strlcat(flag_string, "S ", 7);
if (cnf_type & CNF_MORE_SEGS)
g_strlcat(flag_string, "M ", 7);
if (cnf_type & CNF_ERR_OK)
g_strlcat(flag_string, "E ", 7);
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_length(tvb) < 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) &&
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 (call_dissector(ositp_handle, next_tvb, pinfo, tree) != 0) {
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 one of the protocols in the heuristic list */
}
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);
}
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);
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)
{
ositp_handle = find_dissector("ositp");
ositp_inactive_handle = find_dissector("ositp_inactive");
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);
}
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