forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Add explicit checks for values that don't fit in a gint, rather than relying on testing for < 1 catching that case. Change-Id: I4181087e3499537da88117b710d56c6b5fe9ceaa Reviewed-on: https://code.wireshark.org/review/26843 Reviewed-by: Guy Harris <guy@alum.mit.edu>
614 lines
24 KiB
C
614 lines
24 KiB
C
/* packet-m2pa.c
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* Routines for MTP2 Peer Adaptation Layer dissection
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* It is hopefully (needs testing) compliant to
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* http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-02.txt
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* http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-08.txt
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* http://tools.ietf.org/rfc/rfc4165.txt
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*
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* Copyright 2001, 2002, Jeff Morriss <jeff.morriss.ws [AT] gmail.com>,
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* updated by Michael Tuexen <tuexen [AT] fh-muenster.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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* Copied from packet-m3ua.c
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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/exceptions.h>
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#include <epan/prefs.h>
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#include <epan/sctpppids.h>
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#include <epan/expert.h>
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void proto_register_m2pa(void);
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void proto_reg_handoff_m2pa(void);
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#define SCTP_PORT_M2PA 3565
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static guint global_sctp_port = SCTP_PORT_M2PA;
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static int proto_m2pa = -1;
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static module_t *m2pa_module;
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static int hf_version = -1;
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static int hf_spare = -1;
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static int hf_v2_type = -1;
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static int hf_v8_type = -1;
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static int hf_type = -1;
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static int hf_class = -1;
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static int hf_length = -1;
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static int hf_unused = -1;
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static int hf_bsn = -1;
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static int hf_fsn = -1;
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static int hf_v2_status = -1;
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static int hf_v8_status = -1;
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static int hf_status = -1;
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static int hf_v2_li_spare = -1;
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static int hf_v8_li_spare = -1;
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static int hf_v2_li_prio = -1;
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static int hf_v8_li_prio = -1;
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static int hf_filler = -1;
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static int hf_unknown_data = -1;
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static int hf_pri_prio = -1;
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static int hf_pri_spare = -1;
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static int hf_undecode_data = -1;
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static gint ett_m2pa = -1;
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static gint ett_m2pa_li = -1;
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static expert_field ei_undecode_data = EI_INIT;
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static expert_field ei_length = EI_INIT;
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static dissector_handle_t m2pa_handle;
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static dissector_handle_t mtp3_handle;
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typedef enum {
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M2PA_V02 = 1,
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M2PA_V08 = 2,
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M2PA_RFC4165 = 3
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} Version_Type;
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static gint m2pa_version = M2PA_RFC4165;
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#define VERSION_LENGTH 1
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#define SPARE_LENGTH 1
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#define CLASS_LENGTH 1
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#define V2_TYPE_LENGTH 2
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#define V8_TYPE_LENGTH 1
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#define TYPE_LENGTH V8_TYPE_LENGTH
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#define LENGTH_LENGTH 4
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#define UNUSED_LENGTH 1
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#define BSN_LENGTH 3
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#define FSN_LENGTH 3
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#define V2_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
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V2_TYPE_LENGTH + LENGTH_LENGTH)
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#define V8_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
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CLASS_LENGTH + V8_TYPE_LENGTH + LENGTH_LENGTH + \
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UNUSED_LENGTH + BSN_LENGTH + UNUSED_LENGTH + \
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FSN_LENGTH)
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#define HEADER_LENGTH V8_HEADER_LENGTH
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#define HEADER_OFFSET 0
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#define VERSION_OFFSET HEADER_OFFSET
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#define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
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#define CLASS_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
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#define V2_TYPE_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
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#define V8_TYPE_OFFSET (CLASS_OFFSET + CLASS_LENGTH)
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#define TYPE_OFFSET V8_TYPE_OFFSET
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#define V8_LENGTH_OFFSET (V8_TYPE_OFFSET + V8_TYPE_LENGTH)
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#define LENGTH_OFFSET V8_LENGTH_OFFSET
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#define V2_LENGTH_OFFSET (V2_TYPE_OFFSET + V2_TYPE_LENGTH)
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#define FIRST_UNUSED_OFFSET (V8_LENGTH_OFFSET + LENGTH_LENGTH)
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#define BSN_OFFSET (FIRST_UNUSED_OFFSET + UNUSED_LENGTH)
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#define SECOND_UNUSED_OFFSET (BSN_OFFSET + BSN_LENGTH)
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#define FSN_OFFSET (SECOND_UNUSED_OFFSET + UNUSED_LENGTH)
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static const value_string protocol_version_values[] = {
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{ 1, "Release 1" },
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{ 0, NULL } };
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static const value_string message_class_values[] = {
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{ 0xb, "M2PA" },
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{ 0, NULL } };
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#define V2_USER_DATA_TYPE 0x0601
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#define V2_LINK_STATUS_TYPE 0x0602
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static const value_string v2_message_type_values[] = {
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{ V2_USER_DATA_TYPE, "User Data" },
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{ V2_LINK_STATUS_TYPE, "Link Status" },
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{ 0, NULL } };
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#define V8_USER_DATA_TYPE 0x0001
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#define V8_LINK_STATUS_TYPE 0x0002
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static const value_string v8_message_type_values[] = {
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{ V8_USER_DATA_TYPE, "User Data" },
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{ V8_LINK_STATUS_TYPE, "Link Status" },
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{ 0, NULL } };
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#define USER_DATA_TYPE V8_USER_DATA_TYPE
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#define LINK_STATUS_TYPE V8_LINK_STATUS_TYPE
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static const value_string message_type_values[] = {
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{ USER_DATA_TYPE, "User Data" },
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{ LINK_STATUS_TYPE, "Link Status" },
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{ 0, NULL } };
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static void
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dissect_v2_header(tvbuff_t *header_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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guint16 message_type;
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message_type = tvb_get_ntohs(header_tvb, V2_TYPE_OFFSET);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_type, v2_message_type_values, "reserved"));
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proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_v2_type, header_tvb, V2_TYPE_OFFSET, V2_TYPE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_length, header_tvb, V2_LENGTH_OFFSET, LENGTH_LENGTH, ENC_BIG_ENDIAN);
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}
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static void
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dissect_v8_header(tvbuff_t *header_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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guint8 message_type;
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message_type = tvb_get_guint8(header_tvb, V8_TYPE_OFFSET);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_type, v8_message_type_values, "Unknown"));
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proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_class, header_tvb, CLASS_OFFSET, CLASS_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_v8_type, header_tvb, V8_TYPE_OFFSET, V8_TYPE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_length, header_tvb, V8_LENGTH_OFFSET, LENGTH_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, FIRST_UNUSED_OFFSET, UNUSED_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_bsn, header_tvb, BSN_OFFSET, BSN_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, SECOND_UNUSED_OFFSET, UNUSED_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_fsn, header_tvb, FSN_OFFSET, FSN_LENGTH, ENC_BIG_ENDIAN);
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}
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static void
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dissect_header(tvbuff_t *header_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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guint8 message_type;
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message_type = tvb_get_guint8(header_tvb, V8_TYPE_OFFSET);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_type, v8_message_type_values, "Unknown"));
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proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_class, header_tvb, CLASS_OFFSET, CLASS_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_type, header_tvb, TYPE_OFFSET, TYPE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_length, header_tvb, LENGTH_OFFSET, LENGTH_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, FIRST_UNUSED_OFFSET, UNUSED_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_bsn, header_tvb, BSN_OFFSET, BSN_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, SECOND_UNUSED_OFFSET, UNUSED_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_tree, hf_fsn, header_tvb, FSN_OFFSET, FSN_LENGTH, ENC_BIG_ENDIAN);
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}
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#define LI_OFFSET 0
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#define LI_LENGTH 1
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#define MTP3_OFFSET (LI_OFFSET + LI_LENGTH)
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#define V2_LI_SPARE_MASK 0xfc
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#define V2_LI_PRIORITY_MASK 0x3
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static void
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dissect_v2_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
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{
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proto_tree *m2pa_li_tree;
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tvbuff_t *payload_tvb;
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if (tvb_reported_length(message_data_tvb) > 0) {
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m2pa_li_tree = proto_tree_add_subtree(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, ett_m2pa_li, NULL, "Length Indicator");
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proto_tree_add_item(m2pa_li_tree, hf_v2_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_li_tree, hf_v2_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, ENC_BIG_ENDIAN);
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/* Re-adjust length of M2PA item since it will be dissected as MTP3 */
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proto_item_set_len(m2pa_item, V2_HEADER_LENGTH + LI_LENGTH);
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}
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payload_tvb = tvb_new_subset_remaining(message_data_tvb, MTP3_OFFSET);
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call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
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}
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#define V8_LI_SPARE_MASK 0x3f
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#define V8_LI_PRIORITY_MASK 0xc0
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static void
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dissect_v8_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
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{
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proto_tree *m2pa_li_tree;
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tvbuff_t *payload_tvb;
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if (tvb_reported_length(message_data_tvb) > 0) {
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m2pa_li_tree = proto_tree_add_subtree(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, ett_m2pa_li, NULL, "Length Indicator");
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proto_tree_add_item(m2pa_li_tree, hf_v8_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_li_tree, hf_v8_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, ENC_BIG_ENDIAN);
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/* Re-adjust length of M2PA item since it will be dissected as MTP3 */
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proto_item_set_len(m2pa_item, V8_HEADER_LENGTH + LI_LENGTH);
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payload_tvb = tvb_new_subset_remaining(message_data_tvb, MTP3_OFFSET);
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call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
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}
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}
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#define PRIORITY_MASK 0xc0
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#define SPARE_MASK 0x3f
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#define PRI_OFFSET 0
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#define PRI_LENGTH 1
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static void
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dissect_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
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{
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proto_tree *m2pa_li_tree;
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tvbuff_t *payload_tvb;
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if (tvb_reported_length(message_data_tvb) > 0) {
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m2pa_li_tree = proto_tree_add_subtree(m2pa_tree, message_data_tvb, PRI_OFFSET, PRI_LENGTH, ett_m2pa_li, NULL, "Priority");
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proto_tree_add_item(m2pa_li_tree, hf_pri_prio, message_data_tvb, PRI_OFFSET, PRI_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(m2pa_li_tree, hf_pri_spare, message_data_tvb, PRI_OFFSET, PRI_LENGTH, ENC_BIG_ENDIAN);
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/* Re-adjust length of M2PA item since it will be dissected as MTP3 */
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proto_item_set_len(m2pa_item, HEADER_LENGTH + PRI_LENGTH);
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payload_tvb = tvb_new_subset_remaining(message_data_tvb, MTP3_OFFSET);
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call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
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}
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}
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static const value_string v2_link_status_values[] = {
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{ 1, "In Service" },
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{ 2, "Processor Outage" },
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{ 3, "Processor Outage Ended" },
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{ 4, "Busy" },
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{ 5, "Busy Ended" },
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{ 0, NULL } };
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#define STATUS_LENGTH 4
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#define STATUS_OFFSET 0
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#define FILLER_OFFSET (STATUS_OFFSET + STATUS_LENGTH)
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static void
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dissect_v2_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ", val_to_str_const(tvb_get_ntohl(message_data_tvb, STATUS_OFFSET), v2_link_status_values, "Unknown"));
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proto_tree_add_item(m2pa_tree, hf_v2_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, ENC_BIG_ENDIAN);
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}
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static const value_string v8_link_status_values[] = {
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{ 1, "Alignment" },
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{ 2, "Proving Normal" },
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{ 3, "Proving Emergency" },
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{ 4, "Ready" },
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{ 5, "Processor Outage" },
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{ 6, "Processor Outage Ended" },
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{ 7, "Busy" },
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{ 8, "Busy Ended" },
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{ 9, "Out of Service" },
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{ 0, NULL } };
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static void
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dissect_v8_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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guint16 filler_length;
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col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ", val_to_str_const(tvb_get_ntohl(message_data_tvb, STATUS_OFFSET), v8_link_status_values, "Unknown"));
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filler_length = tvb_reported_length(message_data_tvb) - STATUS_LENGTH;
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proto_tree_add_item(m2pa_tree, hf_v8_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, ENC_BIG_ENDIAN);
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if (filler_length > 0)
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proto_tree_add_item(m2pa_tree, hf_filler, message_data_tvb, FILLER_OFFSET, filler_length, ENC_NA);
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}
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static const value_string link_status_values[] = {
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{ 1, "Alignment" },
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{ 2, "Proving Normal" },
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{ 3, "Proving Emergency" },
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{ 4, "Ready" },
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{ 5, "Processor Outage" },
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{ 6, "Processor Outage Ended" },
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{ 7, "Busy" },
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{ 8, "Busy Ended" },
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{ 9, "Out of Service" },
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{ 0, NULL } };
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static void
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dissect_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
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{
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guint16 filler_length;
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col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ", val_to_str_const(tvb_get_ntohl(message_data_tvb, STATUS_OFFSET), link_status_values, "Unknown"));
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filler_length = tvb_reported_length(message_data_tvb) - STATUS_LENGTH;
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proto_tree_add_item(m2pa_tree, hf_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, ENC_BIG_ENDIAN);
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if (filler_length > 0)
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proto_tree_add_item(m2pa_tree, hf_filler, message_data_tvb, FILLER_OFFSET, filler_length, ENC_NA);
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}
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static void
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dissect_unknown_message(tvbuff_t *message_data_tvb, proto_tree *m2pa_tree)
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{
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guint length;
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length = tvb_reported_length(message_data_tvb);
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if (length > 0)
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proto_tree_add_item(m2pa_tree, hf_unknown_data, message_data_tvb, 0, length, ENC_NA);
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}
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#define V2_MESSAGE_DATA_OFFSET (HEADER_OFFSET + V2_HEADER_LENGTH)
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static void
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dissect_v2_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
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{
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guint32 message_data_length;
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guint16 type;
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tvbuff_t *message_data_tvb;
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message_data_length = tvb_get_ntohl(message_tvb, V2_LENGTH_OFFSET);
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if (message_data_length < 1 || message_data_length > G_MAXINT) {
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proto_tree_add_expert_format(m2pa_tree, pinfo, &ei_length, message_tvb, V2_LENGTH_OFFSET, 4,
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"Invalid message data length: %u", message_data_length);
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return;
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}
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message_data_tvb = tvb_new_subset_length(message_tvb, V2_MESSAGE_DATA_OFFSET, message_data_length);
|
|
type = tvb_get_ntohs(message_tvb, V2_TYPE_OFFSET);
|
|
|
|
switch(type) {
|
|
case V2_USER_DATA_TYPE:
|
|
dissect_v2_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
case V2_LINK_STATUS_TYPE:
|
|
dissect_v2_link_status_message(message_data_tvb, pinfo, m2pa_tree);
|
|
break;
|
|
default:
|
|
dissect_unknown_message(message_data_tvb, m2pa_tree);
|
|
}
|
|
}
|
|
|
|
#define V8_MESSAGE_DATA_OFFSET (HEADER_OFFSET + V8_HEADER_LENGTH)
|
|
|
|
static void
|
|
dissect_v8_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
|
|
{
|
|
guint32 message_data_length;
|
|
guint8 type;
|
|
tvbuff_t *message_data_tvb;
|
|
|
|
message_data_length = tvb_get_ntohl(message_tvb, V8_LENGTH_OFFSET) - V8_HEADER_LENGTH;
|
|
if (message_data_length < 1 || message_data_length > G_MAXINT) {
|
|
proto_tree_add_expert_format(m2pa_tree, pinfo, &ei_length, message_tvb, V8_LENGTH_OFFSET, 4,
|
|
"Invalid message data length: %u", message_data_length);
|
|
return;
|
|
}
|
|
message_data_tvb = tvb_new_subset_length(message_tvb, V8_MESSAGE_DATA_OFFSET, message_data_length);
|
|
type = tvb_get_guint8(message_tvb, V8_TYPE_OFFSET);
|
|
|
|
|
|
switch(type) {
|
|
case V8_USER_DATA_TYPE:
|
|
dissect_v8_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
case V8_LINK_STATUS_TYPE:
|
|
dissect_v8_link_status_message(message_data_tvb, pinfo, m2pa_tree);
|
|
break;
|
|
default:
|
|
dissect_unknown_message(message_data_tvb, m2pa_tree);
|
|
}
|
|
}
|
|
|
|
#define MESSAGE_DATA_OFFSET (HEADER_OFFSET + HEADER_LENGTH)
|
|
|
|
static void
|
|
dissect_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
|
|
{
|
|
guint32 length, message_data_length, actual_length;
|
|
guint8 type;
|
|
tvbuff_t *message_data_tvb;
|
|
|
|
length = tvb_get_ntohl(message_tvb, LENGTH_OFFSET);
|
|
message_data_length = length - HEADER_LENGTH;
|
|
message_data_tvb = tvb_new_subset_length(message_tvb, MESSAGE_DATA_OFFSET, message_data_length);
|
|
type = tvb_get_guint8(message_tvb, TYPE_OFFSET);
|
|
|
|
|
|
switch(type) {
|
|
case USER_DATA_TYPE:
|
|
dissect_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
case LINK_STATUS_TYPE:
|
|
dissect_link_status_message(message_data_tvb, pinfo, m2pa_tree);
|
|
break;
|
|
default:
|
|
dissect_unknown_message(message_data_tvb, m2pa_tree);
|
|
}
|
|
|
|
actual_length = tvb_reported_length(message_tvb);
|
|
|
|
if (actual_length > length)
|
|
{
|
|
proto_item *pi;
|
|
|
|
pi = proto_tree_add_item(m2pa_tree, hf_undecode_data, message_tvb, length, (actual_length - length), ENC_NA);
|
|
expert_add_info_format(pinfo, pi, &ei_undecode_data,
|
|
"There are %d bytes of data which is greater than M2PA's length parameter (%d)",
|
|
actual_length, length);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_v2_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
|
|
{
|
|
dissect_v2_header(message_tvb, pinfo, m2pa_tree);
|
|
dissect_v2_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
}
|
|
|
|
static void
|
|
dissect_v8_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
|
|
{
|
|
dissect_v8_header(message_tvb, pinfo, m2pa_tree);
|
|
dissect_v8_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
}
|
|
|
|
static void
|
|
dissect_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
|
|
{
|
|
dissect_header(message_tvb, pinfo, m2pa_tree);
|
|
dissect_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
}
|
|
|
|
static int
|
|
dissect_m2pa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
proto_item *m2pa_item;
|
|
proto_tree *m2pa_tree;
|
|
|
|
switch(m2pa_version) {
|
|
case M2PA_V02:
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA (ID 02)");
|
|
break;
|
|
case M2PA_V08:
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA (ID 08)");
|
|
break;
|
|
case M2PA_RFC4165:
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA");
|
|
break;
|
|
};
|
|
|
|
m2pa_item = proto_tree_add_item(tree, proto_m2pa, tvb, 0, -1, ENC_NA);
|
|
m2pa_tree = proto_item_add_subtree(m2pa_item, ett_m2pa);
|
|
|
|
switch(m2pa_version) {
|
|
case M2PA_V02:
|
|
dissect_v2_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
case M2PA_V08:
|
|
dissect_v8_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
case M2PA_RFC4165:
|
|
dissect_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
|
|
break;
|
|
};
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
void
|
|
proto_register_m2pa(void)
|
|
{
|
|
static hf_register_info hf[] =
|
|
{ { &hf_version, { "Version", "m2pa.version", FT_UINT8, BASE_DEC, VALS(protocol_version_values), 0x0, NULL, HFILL} },
|
|
{ &hf_spare, { "Spare", "m2pa.spare", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_v2_type, { "Message Type", "m2pa.type_v2", FT_UINT16, BASE_HEX, VALS(v2_message_type_values), 0x0, NULL, HFILL} },
|
|
{ &hf_v8_type, { "Message Type", "m2pa.type_v8", FT_UINT8, BASE_DEC, VALS(v8_message_type_values), 0x0, NULL, HFILL} },
|
|
{ &hf_type, { "Message Type", "m2pa.type", FT_UINT8, BASE_DEC, VALS(message_type_values), 0x0, NULL, HFILL} },
|
|
{ &hf_class, { "Message Class", "m2pa.class", FT_UINT8, BASE_DEC, VALS(message_class_values), 0x0, NULL, HFILL} },
|
|
{ &hf_length, { "Message length", "m2pa.length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_unused, { "Unused", "m2pa.unused", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_bsn, { "BSN", "m2pa.bsn", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_fsn, { "FSN", "m2pa.fsn", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_v2_li_spare, { "Spare", "m2pa.li_spare_v2", FT_UINT8, BASE_DEC, NULL, V2_LI_SPARE_MASK, NULL, HFILL} },
|
|
{ &hf_v8_li_spare, { "Spare", "m2pa.li_spare_v8", FT_UINT8, BASE_HEX, NULL, V8_LI_SPARE_MASK, NULL, HFILL} },
|
|
{ &hf_pri_spare, { "Spare", "m2pa.priority_spare", FT_UINT8, BASE_HEX, NULL, SPARE_MASK, NULL, HFILL} },
|
|
{ &hf_v2_li_prio, { "Priority", "m2pa.li_priority_v2", FT_UINT8, BASE_DEC, NULL, V2_LI_PRIORITY_MASK, NULL, HFILL} },
|
|
{ &hf_v8_li_prio, { "Priority", "m2pa.li_priority_v8", FT_UINT8, BASE_HEX, NULL, V8_LI_PRIORITY_MASK, NULL, HFILL} },
|
|
{ &hf_pri_prio, { "Priority", "m2pa.priority", FT_UINT8, BASE_HEX, NULL, PRIORITY_MASK, NULL, HFILL} },
|
|
{ &hf_v2_status, { "Link Status", "m2pa.status_v2", FT_UINT32, BASE_DEC, VALS(v2_link_status_values), 0x0, NULL, HFILL} },
|
|
{ &hf_v8_status, { "Link Status", "m2pa.status_v8", FT_UINT32, BASE_DEC, VALS(v8_link_status_values), 0x0, NULL, HFILL} },
|
|
{ &hf_status, { "Link Status", "m2pa.status", FT_UINT32, BASE_DEC, VALS(link_status_values), 0x0, NULL, HFILL} },
|
|
{ &hf_filler, { "Filler", "m2pa.filler", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_unknown_data, { "Unknown Data", "m2pa.unknown_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL} },
|
|
{ &hf_undecode_data,{ "Undecoded data", "m2pa.undecoded_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL} }
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_m2pa,
|
|
&ett_m2pa_li
|
|
};
|
|
|
|
static const enum_val_t m2pa_version_options[] = {
|
|
{ "draft-2", "Internet Draft version 2", M2PA_V02 },
|
|
{ "draft-8", "Internet Draft version 8", M2PA_V08 },
|
|
{ "RFC4165", "RFC 4165", M2PA_RFC4165 },
|
|
{ NULL, NULL, 0 }
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_undecode_data, { "m2pa.undecoded_data.expert", PI_MALFORMED, PI_WARN, "There are bytes of data which is greater than M2PA's length parameter", EXPFILL }},
|
|
{ &ei_length, { "m2pa.length.invalid", PI_MALFORMED, PI_ERROR, "Invalid message data length", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_m2pa;
|
|
|
|
proto_m2pa = proto_register_protocol("MTP2 Peer Adaptation Layer", "M2PA", "m2pa");
|
|
|
|
proto_register_field_array(proto_m2pa, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_m2pa = expert_register_protocol(proto_m2pa);
|
|
expert_register_field_array(expert_m2pa, ei, array_length(ei));
|
|
|
|
/* Allow other dissectors to find this one by name. */
|
|
m2pa_handle = register_dissector("m2pa", dissect_m2pa, proto_m2pa);
|
|
|
|
m2pa_module = prefs_register_protocol(proto_m2pa, proto_reg_handoff_m2pa);
|
|
|
|
prefs_register_enum_preference(m2pa_module, "version", "M2PA version", "Version used by Wireshark", &m2pa_version, m2pa_version_options, FALSE);
|
|
prefs_register_uint_preference(m2pa_module, "port", "M2PA SCTP Port", "Set the port for M2PA messages (default: " G_STRINGIFY(SCTP_PORT_M2PA) ")", 10, &global_sctp_port);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_m2pa(void)
|
|
{
|
|
static gboolean prefs_initialized = FALSE;
|
|
static guint sctp_port;
|
|
|
|
/* Port preferences code shamelessly copied from packet-beep.c */
|
|
if (!prefs_initialized) {
|
|
mtp3_handle = find_dissector_add_dependency("mtp3", proto_m2pa);
|
|
|
|
dissector_add_uint("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID, m2pa_handle);
|
|
|
|
prefs_initialized = TRUE;
|
|
|
|
} else {
|
|
|
|
dissector_delete_uint("sctp.port", sctp_port, m2pa_handle);
|
|
|
|
}
|
|
|
|
/* Set our port number for future use */
|
|
sctp_port = global_sctp_port;
|
|
|
|
dissector_add_uint("sctp.port", sctp_port, m2pa_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|