forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
786 lines
30 KiB
C
786 lines
30 KiB
C
/* packet-clnp.c
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* Routines for ISO/OSI network protocol packet disassembly
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*
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* Laurent Deniel <laurent.deniel@free.fr>
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* Ralf Schneider <Ralf.Schneider@t-online.de>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/reassemble.h>
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#include <epan/expert.h>
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#include <epan/nlpid.h>
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#include "packet-osi.h"
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#include "packet-osi-options.h"
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void proto_register_clnp(void);
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void proto_reg_handoff_clnp(void);
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/* protocols and fields */
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static int proto_clnp = -1;
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static gint ett_clnp = -1;
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static gint ett_clnp_type = -1;
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static gint ett_clnp_segments = -1;
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static gint ett_clnp_segment = -1;
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static gint ett_clnp_disc_pdu = -1;
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static int hf_clnp_id = -1;
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static int hf_clnp_length = -1;
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static int hf_clnp_version = -1;
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static int hf_clnp_ttl = -1;
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static int hf_clnp_type = -1;
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static int hf_clnp_cnf_segmentation = -1;
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static int hf_clnp_cnf_more_segments = -1;
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static int hf_clnp_cnf_report_error = -1;
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static int hf_clnp_cnf_type = -1;
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static int hf_clnp_pdu_length = -1;
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static int hf_clnp_data_unit_identifier = -1;
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static int hf_clnp_segment_offset = -1;
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static int hf_clnp_total_length = -1;
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static int hf_clnp_checksum = -1;
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static int hf_clnp_dest_length = -1;
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static int hf_clnp_dest = -1;
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static int hf_clnp_src_length = -1;
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static int hf_clnp_src = -1;
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int hf_clnp_atntt = -1; /* as referenced in packet-osi-options.c */
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int hf_clnp_atnsc = -1; /* as referenced in packet-osi-options.c */
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static int hf_clnp_segments = -1;
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static int hf_clnp_segment = -1;
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static int hf_clnp_segment_overlap = -1;
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static int hf_clnp_segment_overlap_conflict = -1;
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static int hf_clnp_segment_multiple_tails = -1;
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static int hf_clnp_segment_too_long_segment = -1;
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static int hf_clnp_segment_error = -1;
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static int hf_clnp_segment_count = -1;
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static int hf_clnp_reassembled_in = -1;
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static int hf_clnp_reassembled_length = -1;
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static const fragment_items clnp_frag_items = {
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&ett_clnp_segment,
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&ett_clnp_segments,
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&hf_clnp_segments,
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&hf_clnp_segment,
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&hf_clnp_segment_overlap,
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&hf_clnp_segment_overlap_conflict,
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&hf_clnp_segment_multiple_tails,
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&hf_clnp_segment_too_long_segment,
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&hf_clnp_segment_error,
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&hf_clnp_segment_count,
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&hf_clnp_reassembled_in,
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&hf_clnp_reassembled_length,
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/* Reassembled data field */
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NULL,
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"segments"
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};
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static expert_field ei_clnp_length = EI_INIT;
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static dissector_handle_t clnp_handle;
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static dissector_handle_t ositp_handle;
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static dissector_handle_t ositp_inactive_handle;
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static dissector_handle_t idrp_handle;
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/*
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* ISO 8473 OSI CLNP definition (see RFC994)
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*
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* _________________________________
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* | Fixed Part |
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* |_________________________________|
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* | Address Part |
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* |_________________________________|
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* | Segmentation Part (optional) |
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* |_________________________________|
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* | Options Part (optional) |
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* |_________________________________|
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* | Data (optional) |
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* |_________________________________|
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*/
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#define ISO8473_V1 0x01 /* CLNP version 1 */
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/* Fixed part */
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/* Length of fixed part */
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#define FIXED_PART_LEN 9
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#define CNF_TYPE 0x1f
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#define CNF_ERR_OK 0x20
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#define CNF_MORE_SEGS 0x40
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#define CNF_SEG_OK 0x80
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#define DT_NPDU 0x1C
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#define MD_NPDU 0x1D
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#define ER_NPDU 0x01
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#define ERQ_NPDU 0x1E
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#define ERP_NPDU 0x1F
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static const value_string npdu_type_abbrev_vals[] = {
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{ DT_NPDU, "DT" },
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{ MD_NPDU, "MD" },
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{ ER_NPDU, "ER" },
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{ ERQ_NPDU, "ERQ" },
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{ ERP_NPDU, "ERP" },
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{ 0, NULL }
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};
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static const value_string npdu_type_vals[] = {
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{ DT_NPDU, "Data" },
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{ MD_NPDU, "Multicast Data" },
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{ ER_NPDU, "Error Report" },
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{ ERQ_NPDU, "Echo Request" },
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{ ERP_NPDU, "Echo Response" },
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{ 0, NULL }
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};
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/* field position */
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#define P_CLNP_PROTO_ID 0
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#define P_CLNP_HDR_LEN 1
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#define P_CLNP_VERS 2
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#define P_CLNP_TTL 3
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#define P_CLNP_TYPE 4
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#define P_CLNP_SEGLEN 5
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#define P_CLNP_CKSUM 7
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#define P_CLNP_ADDRESS_PART 9
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/* Segmentation part */
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#define SEGMENTATION_PART_LEN 6
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struct clnp_segment {
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gushort cng_id; /* data unit identifier */
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gushort cng_off; /* segment offset */
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gushort cng_tot_len; /* total length */
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};
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/* NSAP selector */
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#define NSEL_NET 0x00
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#define NSEL_NP 0x20
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#define NSEL_TP 0x21
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/* global variables */
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/* List of dissectors to call for CLNP packets */
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static heur_dissector_list_t clnp_heur_subdissector_list;
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/*
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* Reassembly of CLNP.
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*/
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static reassembly_table clnp_reassembly_table;
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/* options */
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static guint tp_nsap_selector = NSEL_TP;
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static gboolean always_decode_transport = FALSE;
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static gboolean clnp_reassemble = TRUE;
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gboolean clnp_decode_atn_options = FALSE;
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/* function definitions */
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/*
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* CLNP part / main entry point
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*/
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static int
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dissect_clnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *clnp_tree;
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proto_item *ti, *ti_len = NULL, *ti_pdu_len = NULL, *ti_tot_len = NULL;
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guint8 cnf_proto_id;
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guint8 cnf_hdr_len;
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guint8 cnf_vers;
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guint8 cnf_ttl;
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guint8 cnf_type;
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char flag_string[6+1];
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const char *pdu_type_string;
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proto_tree *type_tree;
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guint16 segment_length;
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guint16 du_id = 0;
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guint16 segment_offset = 0;
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guint16 total_length;
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guint16 cnf_cksum;
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cksum_status_t cksum_status;
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int offset;
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guchar src_len, dst_len, nsel, opt_len = 0;
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guint next_length;
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proto_tree *discpdu_tree;
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gboolean save_in_error_pkt;
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fragment_head *fd_head;
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tvbuff_t *next_tvb;
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gboolean update_col_info = TRUE;
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gboolean save_fragmented;
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heur_dtbl_entry_t *hdtbl_entry;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CLNP");
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col_clear(pinfo->cinfo, COL_INFO);
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cnf_proto_id = tvb_get_guint8(tvb, P_CLNP_PROTO_ID);
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if (cnf_proto_id == NLPID_NULL) {
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col_set_str(pinfo->cinfo, COL_INFO, "Inactive subset");
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ti = proto_tree_add_item(tree, proto_clnp, tvb, P_CLNP_PROTO_ID, 1, ENC_NA);
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clnp_tree = proto_item_add_subtree(ti, ett_clnp);
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proto_tree_add_uint_format(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
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cnf_proto_id, "Inactive subset");
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next_tvb = tvb_new_subset_remaining(tvb, 1);
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call_dissector(ositp_inactive_handle, next_tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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/* return if version not known */
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cnf_vers = tvb_get_guint8(tvb, P_CLNP_VERS);
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if (cnf_vers != ISO8473_V1) {
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call_data_dissector(tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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/* fixed part decoding */
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cnf_hdr_len = tvb_get_guint8(tvb, P_CLNP_HDR_LEN);
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ti = proto_tree_add_item(tree, proto_clnp, tvb, 0, cnf_hdr_len, ENC_NA);
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clnp_tree = proto_item_add_subtree(ti, ett_clnp);
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proto_tree_add_uint(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
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cnf_proto_id);
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ti_len = proto_tree_add_uint(clnp_tree, hf_clnp_length, tvb, P_CLNP_HDR_LEN, 1,
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cnf_hdr_len);
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if (cnf_hdr_len < FIXED_PART_LEN) {
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/* Header length is less than the length of the fixed part of
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the header. */
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expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
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"Header length value < minimum length %u",
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FIXED_PART_LEN);
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return 2;
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}
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proto_tree_add_uint(clnp_tree, hf_clnp_version, tvb, P_CLNP_VERS, 1,
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cnf_vers);
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cnf_ttl = tvb_get_guint8(tvb, P_CLNP_TTL);
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proto_tree_add_uint_format(clnp_tree, hf_clnp_ttl, tvb, P_CLNP_TTL, 1,
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cnf_ttl,
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"Holding Time : %u (%u.%u secs)",
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cnf_ttl, cnf_ttl / 2, (cnf_ttl % 2) * 5);
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cnf_type = tvb_get_guint8(tvb, P_CLNP_TYPE);
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pdu_type_string = val_to_str(cnf_type & CNF_TYPE, npdu_type_abbrev_vals,
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"Unknown (0x%02x)");
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flag_string[0] = '\0';
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if (cnf_type & CNF_SEG_OK)
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g_strlcat(flag_string, "S ", 7);
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if (cnf_type & CNF_MORE_SEGS)
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g_strlcat(flag_string, "M ", 7);
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if (cnf_type & CNF_ERR_OK)
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g_strlcat(flag_string, "E ", 7);
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ti = proto_tree_add_uint_format(clnp_tree, hf_clnp_type, tvb, P_CLNP_TYPE, 1,
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cnf_type,
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"PDU Type : 0x%02x (%s%s)",
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cnf_type,
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flag_string,
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pdu_type_string);
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type_tree = proto_item_add_subtree(ti, ett_clnp_type);
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proto_tree_add_item(type_tree, hf_clnp_cnf_segmentation, tvb, P_CLNP_TYPE, 1, ENC_NA);
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proto_tree_add_item(type_tree, hf_clnp_cnf_more_segments, tvb, P_CLNP_TYPE, 1, ENC_NA);
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proto_tree_add_item(type_tree, hf_clnp_cnf_report_error, tvb, P_CLNP_TYPE, 1, ENC_NA);
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proto_tree_add_item(type_tree, hf_clnp_cnf_type, tvb, P_CLNP_TYPE, 1, ENC_BIG_ENDIAN);
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/* If we don't have the full header - i.e., not enough to see the
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segmentation part and determine whether this datagram is segmented
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or not - set the Info column now; we'll get an exception before
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we set it otherwise. */
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if (tvb_reported_length(tvb) < cnf_hdr_len) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
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}
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segment_length = tvb_get_ntohs(tvb, P_CLNP_SEGLEN);
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ti_pdu_len = proto_tree_add_uint(clnp_tree, hf_clnp_pdu_length, tvb, P_CLNP_SEGLEN, 2,
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segment_length);
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if (segment_length < cnf_hdr_len) {
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/* Segment length is less than the header length. */
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expert_add_info_format(pinfo, ti_pdu_len, &ei_clnp_length,
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"PDU length < header length %u", cnf_hdr_len);
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return 7;
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}
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cnf_cksum = tvb_get_ntohs(tvb, P_CLNP_CKSUM);
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cksum_status = calc_checksum(tvb, 0, cnf_hdr_len, cnf_cksum);
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switch (cksum_status) {
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default:
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/*
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* No checksum present, or not enough of the header present to
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* checksum it.
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*/
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proto_tree_add_uint(clnp_tree, hf_clnp_checksum, tvb,
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P_CLNP_CKSUM, 2,
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cnf_cksum);
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break;
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case CKSUM_OK:
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/*
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* Checksum is correct.
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*/
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proto_tree_add_uint_format_value(clnp_tree, hf_clnp_checksum, tvb,
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P_CLNP_CKSUM, 2,
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cnf_cksum,
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"0x%04x (correct)",
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cnf_cksum);
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break;
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case CKSUM_NOT_OK:
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/*
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* Checksum is not correct.
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*/
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proto_tree_add_uint_format_value(clnp_tree, hf_clnp_checksum, tvb,
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P_CLNP_CKSUM, 2,
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cnf_cksum,
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"0x%04x (incorrect)",
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cnf_cksum);
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break;
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}
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opt_len = cnf_hdr_len;
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opt_len -= FIXED_PART_LEN; /* Fixed part of Header */
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/* address part */
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offset = P_CLNP_ADDRESS_PART;
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if (opt_len < 1) {
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/* Header length is less than the minimum value in CLNP,
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including the destination address length. */
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expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
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"Header length value < %u",
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FIXED_PART_LEN + 1);
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return offset;
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}
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dst_len = tvb_get_guint8(tvb, offset);
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if (tree) {
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proto_tree_add_uint(clnp_tree, hf_clnp_dest_length, tvb, offset, 1,
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dst_len);
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}
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offset += 1;
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opt_len -= 1;
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if (opt_len < dst_len) {
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/* Header length is less than the minimum value,
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including the destination address length and the
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destination address. */
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expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
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"Header length value < %u",
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FIXED_PART_LEN + 1 + dst_len);
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return offset;
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}
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nsel = tvb_get_guint8(tvb, offset + dst_len - 1);
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set_address_tvb(&pinfo->net_dst, get_osi_address_type(), dst_len, tvb, offset);
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copy_address_shallow(&pinfo->dst, &pinfo->net_dst);
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proto_tree_add_bytes_format_value(clnp_tree, hf_clnp_dest, tvb, offset, dst_len,
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NULL,
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"%s",
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print_nsap_net(tvb, offset, dst_len));
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offset += dst_len;
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opt_len -= dst_len;
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if (opt_len < 1) {
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/* Header length is less than the minimum value,
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including the destination address length, the
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destination address, and the source address length. */
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expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
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"Header length value < %u",
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FIXED_PART_LEN + 1 + dst_len + 1);
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return offset;
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}
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src_len = tvb_get_guint8(tvb, offset);
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if (tree) {
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proto_tree_add_uint(clnp_tree, hf_clnp_src_length, tvb,
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offset, 1, src_len);
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}
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offset += 1;
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opt_len -= 1;
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if (opt_len < src_len) {
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/* Header length is less than the minimum value,
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including the destination address length, the
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destination address, the source address length,
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and the source address. */
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expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
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"Header length value < %u",
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FIXED_PART_LEN + 1 + dst_len + 1 + src_len);
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return offset;
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}
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set_address_tvb(&pinfo->net_src, get_osi_address_type(), src_len, tvb, offset);
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copy_address_shallow(&pinfo->src, &pinfo->net_src);
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proto_tree_add_bytes_format_value(clnp_tree, hf_clnp_src, tvb, offset, src_len,
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NULL,
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"%s",
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print_nsap_net(tvb, offset, src_len));
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offset += src_len;
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opt_len -= src_len;
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|
|
|
/* Segmentation Part */
|
|
|
|
if (cnf_type & CNF_SEG_OK) {
|
|
if (opt_len < SEGMENTATION_PART_LEN) {
|
|
/* Header length is less than the minimum value,
|
|
including the destination address length, the
|
|
destination address, the source address length,
|
|
the source address, and the segmentation part. */
|
|
expert_add_info_format(pinfo, ti_len, &ei_clnp_length,
|
|
"Header length value < %u",
|
|
FIXED_PART_LEN + 1 + dst_len + 1 + SEGMENTATION_PART_LEN);
|
|
return offset;
|
|
}
|
|
|
|
du_id = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(clnp_tree, hf_clnp_data_unit_identifier, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
segment_offset = tvb_get_ntohs(tvb, offset + 2);
|
|
proto_tree_add_item(clnp_tree, hf_clnp_segment_offset, tvb, offset + 2 , 2, ENC_BIG_ENDIAN);
|
|
total_length = tvb_get_ntohs(tvb, offset + 4);
|
|
ti_tot_len = proto_tree_add_item(clnp_tree, hf_clnp_total_length, tvb, offset + 4 , 2, ENC_BIG_ENDIAN);
|
|
if (total_length < segment_length) {
|
|
/* Reassembled length is less than the length of this segment. */
|
|
expert_add_info_format(pinfo, ti_tot_len, &ei_clnp_length,
|
|
"Total length < segment length %u", segment_length);
|
|
return offset;
|
|
}
|
|
offset += SEGMENTATION_PART_LEN;
|
|
opt_len -= SEGMENTATION_PART_LEN;
|
|
}
|
|
|
|
dissect_osi_options(opt_len, tvb, offset, clnp_tree, pinfo);
|
|
|
|
offset += opt_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(&clnp_reassembly_table,
|
|
tvb, offset, pinfo, du_id, NULL,
|
|
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. Set its length to the segment
|
|
length, and flag it as a fragment, so going past the end
|
|
reports FragmentBoundsError, i.e. "there's data missing
|
|
because this isn't reassembled", not ReportedBoundsError,
|
|
i.e. "the dissector ran past the end of the packet, so the
|
|
packet must not have been constructed properly". */
|
|
next_tvb = tvb_new_subset_length(tvb, offset, segment_length - cnf_hdr_len);
|
|
tvb_set_fragment(next_tvb);
|
|
|
|
/*
|
|
* 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. */
|
|
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_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, tree);
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
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==NSEL_NET && tvb_get_guint8(next_tvb, 0)==NLPID_ISO10747_IDRP) {
|
|
if(call_dissector(idrp_handle, next_tvb, pinfo, tree) != 0) {
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
}
|
|
if (nsel == (guchar)tp_nsap_selector || always_decode_transport) {
|
|
if (call_dissector(ositp_handle, next_tvb, pinfo, tree) != 0) {
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb); /* yes, it appears to be COTP or CLTP */
|
|
}
|
|
}
|
|
if (dissector_try_heuristic(clnp_heur_subdissector_list, next_tvb,
|
|
pinfo, tree, &hdtbl_entry, NULL)) {
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb); /* 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. */
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
|
|
next_length = tvb_reported_length_remaining(tvb, offset);
|
|
if (next_length != 0) {
|
|
/* We have payload; dissect it. */
|
|
discpdu_tree = proto_tree_add_subtree(clnp_tree, tvb, offset, next_length,
|
|
ett_clnp_disc_pdu, NULL, "Discarded 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->flags.in_error_pkt;
|
|
pinfo->flags.in_error_pkt = TRUE;
|
|
|
|
call_dissector(clnp_handle, next_tvb, pinfo, discpdu_tree);
|
|
|
|
/* Restore the "we're inside an error packet" flag. */
|
|
pinfo->flags.in_error_pkt = save_in_error_pkt;
|
|
}
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb); /* we're done with this PDU */
|
|
|
|
case ERQ_NPDU:
|
|
case ERP_NPDU:
|
|
/* XXX - dissect this */
|
|
break;
|
|
}
|
|
}
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s NPDU %s", pdu_type_string, flag_string);
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
pinfo->fragmented = save_fragmented;
|
|
return tvb_captured_length(tvb);
|
|
} /* dissect_clnp */
|
|
|
|
static void
|
|
clnp_reassemble_init(void)
|
|
{
|
|
reassembly_table_init(&clnp_reassembly_table,
|
|
&addresses_reassembly_table_functions);
|
|
}
|
|
|
|
static void
|
|
clnp_reassemble_cleanup(void)
|
|
{
|
|
reassembly_table_destroy(&clnp_reassembly_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, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_length,
|
|
{ "HDR Length", "clnp.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_version,
|
|
{ "Version", "clnp.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_ttl,
|
|
{ "Holding Time", "clnp.ttl", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_type,
|
|
{ "PDU Type", "clnp.type", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_cnf_segmentation,
|
|
{ "Segmentation permitted", "clnp.cnf.segmentation", FT_BOOLEAN, 8, TFS(&tfs_yes_no), CNF_SEG_OK, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_cnf_more_segments,
|
|
{ "More segments", "clnp.cnf.more_segments", FT_BOOLEAN, 8, TFS(&tfs_yes_no), CNF_MORE_SEGS, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_cnf_report_error,
|
|
{ "Report error if PDU discarded", "clnp.cnf.report_error", FT_BOOLEAN, 8, TFS(&tfs_yes_no), CNF_ERR_OK, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_cnf_type,
|
|
{ "Type", "clnp.cnf.type", FT_UINT8, BASE_DEC, VALS(npdu_type_vals), CNF_TYPE, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_pdu_length,
|
|
{ "PDU length", "clnp.pdu.len", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_data_unit_identifier,
|
|
{ "Data unit identifier", "clnp.data_unit_identifier", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_segment_offset,
|
|
{ "Segment offset", "clnp.segment_offset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_total_length,
|
|
{ "Total length", "clnp.total_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_checksum,
|
|
{ "Checksum", "clnp.checksum", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_dest_length,
|
|
{ "DAL", "clnp.dsap.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_dest,
|
|
{ "DA", "clnp.dsap", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_src_length,
|
|
{ "SAL", "clnp.ssap.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_src,
|
|
{ "SA", "clnp.ssap", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_atntt,
|
|
{ "ATN traffic type", "clnp.atn.tt", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_clnp_atnsc,
|
|
{ "ATN security classification", "clnp.atn.sc", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, 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_count,
|
|
{ "Segment count", "clnp.segment.count", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_clnp_segment,
|
|
{ "CLNP Segment", "clnp.segment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_clnp_segments,
|
|
{ "CLNP Segments", "clnp.segments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, 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 }},
|
|
|
|
{ &hf_clnp_reassembled_length,
|
|
{ "Reassembled CLNP length", "clnp.reassembled.length", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The total length of the reassembled payload", HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_clnp,
|
|
&ett_clnp_type,
|
|
&ett_clnp_segments,
|
|
&ett_clnp_segment,
|
|
&ett_clnp_disc_pdu,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_clnp_length, { "clnp.len.bad", PI_MALFORMED, PI_ERROR, "Header length value bad", EXPFILL }},
|
|
};
|
|
|
|
module_t *clnp_module;
|
|
expert_module_t* expert_clnp;
|
|
|
|
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));
|
|
expert_clnp = expert_register_protocol(proto_clnp);
|
|
expert_register_field_array(expert_clnp, ei, array_length(ei));
|
|
clnp_handle = register_dissector("clnp", dissect_clnp, proto_clnp);
|
|
clnp_heur_subdissector_list = register_heur_dissector_list("clnp", proto_clnp);
|
|
register_init_routine(clnp_reassemble_init);
|
|
register_cleanup_routine(clnp_reassemble_cleanup);
|
|
|
|
register_osi_address_type();
|
|
|
|
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);
|
|
prefs_register_bool_preference(clnp_module, "decode_atn_options",
|
|
"Decode ATN security label",
|
|
"Whether ATN security label should be decoded",
|
|
&clnp_decode_atn_options);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_clnp(void)
|
|
{
|
|
ositp_handle = find_dissector_add_dependency("ositp", proto_clnp);
|
|
ositp_inactive_handle = find_dissector_add_dependency("ositp_inactive", proto_clnp);
|
|
idrp_handle = find_dissector_add_dependency("idrp", proto_clnp);
|
|
|
|
dissector_add_uint("osinl.incl", NLPID_ISO8473_CLNP, clnp_handle);
|
|
dissector_add_uint("osinl.incl", NLPID_NULL, clnp_handle); /* Inactive subset */
|
|
dissector_add_uint("x.25.spi", NLPID_ISO8473_CLNP, clnp_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|