forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
It's not tied to the frame_data structure any more, so it belongs by itself. Clean up some #includes while we're at it; in particular, frame_data.h doesn't use anything related to tvbuffs, so don't have it gratuitiously include tvbuff.h. Change-Id: Ic32922d4a3840bac47007c5d4c546b8842245e0c Reviewed-on: https://code.wireshark.org/review/13518 Reviewed-by: Guy Harris <guy@alum.mit.edu>
1581 lines
54 KiB
C
1581 lines
54 KiB
C
/* packet-mp2t.c
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*
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* Routines for RFC 2250 MPEG2 (ISO/IEC 13818-1) Transport Stream dissection
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*
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* Copyright 2006, Erwin Rol <erwin@erwinrol.com>
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* Copyright 2012-2014, Guy Martin <gmsoft@tuxicoman.be>
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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 <wiretap/wtap.h>
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#include <epan/rtp_pt.h>
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#include <epan/conversation.h>
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#include <epan/expert.h>
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#include <epan/reassemble.h>
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#include <epan/address_types.h>
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#include <epan/proto_data.h>
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#include "packet-l2tp.h"
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#include <epan/tvbuff-int.h> /* XXX, for tvb_new_proxy() */
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void proto_register_mp2t(void);
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void proto_reg_handoff_mp2t(void);
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/* The MPEG2 TS packet size */
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#define MP2T_PACKET_SIZE 188
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#define MP2T_SYNC_BYTE 0x47
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#define MP2T_PID_DOCSIS 0x1FFE
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#define MP2T_PID_NULL 0x1FFF
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static dissector_handle_t mp2t_handle;
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static dissector_handle_t docsis_handle;
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static dissector_handle_t mpeg_pes_handle;
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static dissector_handle_t mpeg_sect_handle;
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static dissector_handle_t data_handle;
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static heur_dissector_list_t heur_subdissector_list;
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static int proto_mp2t = -1;
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static gint ett_mp2t = -1;
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static gint ett_mp2t_header = -1;
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static gint ett_mp2t_af = -1;
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static gint ett_mp2t_analysis = -1;
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static gint ett_stuff = -1;
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static int hf_mp2t_header = -1;
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static int hf_mp2t_sync_byte = -1;
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static int hf_mp2t_tei = -1;
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static int hf_mp2t_pusi = -1;
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static int hf_mp2t_tp = -1;
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static int hf_mp2t_pid = -1;
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static int hf_mp2t_tsc = -1;
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static int hf_mp2t_afc = -1;
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static int hf_mp2t_cc = -1;
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/* static int hf_mp2t_analysis_flags = -1; */
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static int hf_mp2t_analysis_skips = -1;
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static int hf_mp2t_analysis_drops = -1;
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#define MP2T_SYNC_BYTE_MASK 0xFF000000
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#define MP2T_TEI_MASK 0x00800000
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#define MP2T_PUSI_MASK 0x00400000
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#define MP2T_TP_MASK 0x00200000
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#define MP2T_PID_MASK 0x001FFF00
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#define MP2T_TSC_MASK 0x000000C0
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#define MP2T_AFC_MASK 0x00000030
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#define MP2T_CC_MASK 0x0000000F
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#define MP2T_SYNC_BYTE_SHIFT 24
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#define MP2T_TEI_SHIFT 23
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#define MP2T_PUSI_SHIFT 22
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#define MP2T_TP_SHIFT 21
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#define MP2T_PID_SHIFT 8
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#define MP2T_TSC_SHIFT 6
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#define MP2T_AFC_SHIFT 4
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#define MP2T_CC_SHIFT 0
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static int hf_mp2t_af = -1;
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static int hf_mp2t_af_length = -1;
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static int hf_mp2t_af_di = -1;
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static int hf_mp2t_af_rai = -1;
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static int hf_mp2t_af_espi = -1;
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static int hf_mp2t_af_pcr_flag = -1;
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static int hf_mp2t_af_opcr_flag = -1;
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static int hf_mp2t_af_sp_flag = -1;
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static int hf_mp2t_af_tpd_flag = -1;
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static int hf_mp2t_af_afe_flag = -1;
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#define MP2T_AF_DI_MASK 0x80
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#define MP2T_AF_RAI_MASK 0x40
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#define MP2T_AF_ESPI_MASK 0x20
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#define MP2T_AF_PCR_MASK 0x10
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#define MP2T_AF_OPCR_MASK 0x08
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#define MP2T_AF_SP_MASK 0x04
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#define MP2T_AF_TPD_MASK 0x02
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#define MP2T_AF_AFE_MASK 0x01
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#define MP2T_AF_DI_SHIFT 7
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#define MP2T_AF_RAI_SHIFT 6
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#define MP2T_AF_ESPI_SHIFT 5
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#define MP2T_AF_PCR_SHIFT 4
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#define MP2T_AF_OPCR_SHIFT 3
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#define MP2T_AF_SP_SHIFT 2
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#define MP2T_AF_TPD_SHIFT 1
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#define MP2T_AF_AFE_SHIFT 0
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static int hf_mp2t_af_pcr = -1;
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static int hf_mp2t_af_opcr = -1;
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static int hf_mp2t_af_sc = -1;
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static int hf_mp2t_af_tpd_length = -1;
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static int hf_mp2t_af_tpd = -1;
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static int hf_mp2t_af_e_length = -1;
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static int hf_mp2t_af_e_ltw_flag = -1;
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static int hf_mp2t_af_e_pr_flag = -1;
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static int hf_mp2t_af_e_ss_flag = -1;
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static int hf_mp2t_af_e_reserved = -1;
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#define MP2T_AF_E_LTW_FLAG_MASK 0x80
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#define MP2T_AF_E_PR_FLAG_MASK 0x40
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#define MP2T_AF_E_SS_FLAG_MASK 0x20
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static int hf_mp2t_af_e_reserved_bytes = -1;
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static int hf_mp2t_af_stuffing_bytes = -1;
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static int hf_mp2t_af_e_ltwv_flag = -1;
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static int hf_mp2t_af_e_ltwo = -1;
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static int hf_mp2t_af_e_pr_reserved = -1;
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static int hf_mp2t_af_e_pr = -1;
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static int hf_mp2t_af_e_st = -1;
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static int hf_mp2t_af_e_dnau_32_30 = -1;
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static int hf_mp2t_af_e_m_1 = -1;
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static int hf_mp2t_af_e_dnau_29_15 = -1;
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static int hf_mp2t_af_e_m_2 = -1;
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static int hf_mp2t_af_e_dnau_14_0 = -1;
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static int hf_mp2t_af_e_m_3 = -1;
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/* static int hf_mp2t_payload = -1; */
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static int hf_mp2t_stuff_bytes = -1;
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static int hf_mp2t_pointer = -1;
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static int mp2t_no_address_type = -1;
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static const value_string mp2t_sync_byte_vals[] = {
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{ MP2T_SYNC_BYTE, "Correct" },
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{ 0, NULL }
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};
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static const value_string mp2t_pid_vals[] = {
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{ 0x0000, "Program Association Table" },
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{ 0x0001, "Conditional Access Table" },
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{ 0x0002, "Transport Stream Description Table" },
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{ 0x0003, "Reserved" },
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{ 0x0004, "Reserved" },
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{ 0x0005, "Reserved" },
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{ 0x0006, "Reserved" },
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{ 0x0007, "Reserved" },
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{ 0x0008, "Reserved" },
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{ 0x0009, "Reserved" },
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{ 0x000A, "Reserved" },
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{ 0x000B, "Reserved" },
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{ 0x000C, "Reserved" },
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{ 0x000D, "Reserved" },
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{ 0x000E, "Reserved" },
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{ 0x000F, "Reserved" },
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{ 0x1FFE, "DOCSIS Data-over-cable well-known PID" },
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{ 0x1FFF, "Null packet" },
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{ 0, NULL }
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};
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/* Values below according ETSI ETR 289 */
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static const value_string mp2t_tsc_vals[] = {
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{ 0, "Not scrambled" },
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{ 1, "Reserved" },
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{ 2, "Packet scrambled with Even Key" },
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{ 3, "Packet scrambled with Odd Key" },
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{ 0, NULL }
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};
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static const value_string mp2t_afc_vals[] = {
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{ 0, "Reserved" },
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{ 1, "Payload only" },
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{ 2, "Adaptation Field only" },
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{ 3, "Adaptation Field and Payload" },
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{ 0, NULL }
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};
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static gint ett_msg_fragment = -1;
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static gint ett_msg_fragments = -1;
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static int hf_msg_fragments = -1;
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static int hf_msg_fragment = -1;
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static int hf_msg_fragment_overlap = -1;
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static int hf_msg_fragment_overlap_conflicts = -1;
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static int hf_msg_fragment_multiple_tails = -1;
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static int hf_msg_fragment_too_long_fragment = -1;
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static int hf_msg_fragment_error = -1;
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static int hf_msg_fragment_count = -1;
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static int hf_msg_reassembled_in = -1;
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static int hf_msg_reassembled_length = -1;
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static int hf_msg_ts_packet_reassembled = -1;
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static expert_field ei_mp2t_pointer = EI_INIT;
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static expert_field ei_mp2t_cc_drop = EI_INIT;
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static expert_field ei_mp2t_invalid_afc = EI_INIT;
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static const fragment_items mp2t_msg_frag_items = {
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/* Fragment subtrees */
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&ett_msg_fragment,
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&ett_msg_fragments,
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/* Fragment fields */
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&hf_msg_fragments,
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&hf_msg_fragment,
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&hf_msg_fragment_overlap,
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&hf_msg_fragment_overlap_conflicts,
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&hf_msg_fragment_multiple_tails,
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&hf_msg_fragment_too_long_fragment,
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&hf_msg_fragment_error,
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&hf_msg_fragment_count,
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/* Reassembled in field */
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&hf_msg_reassembled_in,
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/* Reassembled length field */
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&hf_msg_reassembled_length,
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/* Reassembled data field */
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NULL,
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/* Tag */
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"Message fragments"
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};
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/* Data structure used for detecting CC drops
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*
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* conversation
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* |
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* +-> mp2t_analysis_data
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* |
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* +-> pid_table (RB tree) (key: pid)
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* | |
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* | +-> pid_analysis_data (per pid)
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* | +-> pid_analysis_data
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* | +-> pid_analysis_data
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* |
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* +-> frame_table (RB tree) (key: pinfo->num)
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* |
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* +-> frame_analysis_data (only created if drop detected)
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* |
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* +-> ts_table (RB tree)
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* |
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* +-> ts_analysis_data (per TS subframe)
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* +-> ts_analysis_data
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* +-> ts_analysis_data
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*/
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typedef struct mp2t_analysis_data {
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/* This structure contains a tree containing data for the
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* individual pid's, this is only used when packets are
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* processed sequentially.
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*/
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wmem_tree_t *pid_table;
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/* When detecting a CC drop, store that information for the
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* given frame. This info is needed, when clicking around in
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* wireshark, as the pid table data only makes sense during
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* sequential processing. The flag pinfo->fd->flags.visited is
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* used to tell the difference.
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*
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*/
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wmem_tree_t *frame_table;
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/* Total counters per conversation / multicast stream */
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guint32 total_skips;
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guint32 total_discontinuity;
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} mp2t_analysis_data_t;
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enum pid_payload_type {
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pid_pload_unknown,
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pid_pload_docsis,
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pid_pload_pes,
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pid_pload_sect,
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pid_pload_null
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};
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typedef struct subpacket_analysis_data {
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guint32 frag_cur_pos;
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guint32 frag_tot_len;
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gboolean fragmentation;
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guint32 frag_id;
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} subpacket_analysis_data_t;
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typedef struct packet_analysis_data {
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/* Contain information for each MPEG2-TS packet in the current big packet */
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wmem_tree_t *subpacket_table;
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} packet_analysis_data_t;
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/* Analysis TS frame info needed during sequential processing */
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typedef struct pid_analysis_data {
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guint16 pid;
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gint8 cc_prev; /* Previous CC number */
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enum pid_payload_type pload_type;
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/* Fragments information used for first pass */
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gboolean fragmentation;
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guint32 frag_cur_pos;
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guint32 frag_tot_len;
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guint32 frag_id;
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} pid_analysis_data_t;
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/* Analysis info stored for a TS frame */
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typedef struct ts_analysis_data {
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guint16 pid;
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gint8 cc_prev; /* Previous CC number */
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guint8 skips; /* Skips between Ccs max 14 */
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} ts_analysis_data_t;
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typedef struct frame_analysis_data {
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/* As each frame has several pid's, thus need a pid data
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* structure per TS frame.
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*/
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wmem_tree_t *ts_table;
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} frame_analysis_data_t;
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static mp2t_analysis_data_t *
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init_mp2t_conversation_data(void)
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{
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mp2t_analysis_data_t *mp2t_data;
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mp2t_data = wmem_new0(wmem_file_scope(), struct mp2t_analysis_data);
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mp2t_data->pid_table = wmem_tree_new(wmem_file_scope());
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mp2t_data->frame_table = wmem_tree_new(wmem_file_scope());
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mp2t_data->total_skips = 0;
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mp2t_data->total_discontinuity = 0;
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return mp2t_data;
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}
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static mp2t_analysis_data_t *
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get_mp2t_conversation_data(conversation_t *conv)
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{
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mp2t_analysis_data_t *mp2t_data;
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mp2t_data = (mp2t_analysis_data_t *)conversation_get_proto_data(conv, proto_mp2t);
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if (!mp2t_data) {
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mp2t_data = init_mp2t_conversation_data();
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conversation_add_proto_data(conv, proto_mp2t, mp2t_data);
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}
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return mp2t_data;
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}
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static frame_analysis_data_t *
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init_frame_analysis_data(mp2t_analysis_data_t *mp2t_data, packet_info *pinfo)
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{
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frame_analysis_data_t *frame_analysis_data_p;
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frame_analysis_data_p = wmem_new0(wmem_file_scope(), struct frame_analysis_data);
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frame_analysis_data_p->ts_table = wmem_tree_new(wmem_file_scope());
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/* Insert into mp2t tree */
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wmem_tree_insert32(mp2t_data->frame_table, pinfo->num,
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(void *)frame_analysis_data_p);
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return frame_analysis_data_p;
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}
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static frame_analysis_data_t *
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get_frame_analysis_data(mp2t_analysis_data_t *mp2t_data, packet_info *pinfo)
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{
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frame_analysis_data_t *frame_analysis_data_p;
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frame_analysis_data_p = (frame_analysis_data_t *)wmem_tree_lookup32(mp2t_data->frame_table, pinfo->num);
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return frame_analysis_data_p;
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}
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static pid_analysis_data_t *
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get_pid_analysis(mp2t_analysis_data_t *mp2t_data, guint32 pid)
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{
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pid_analysis_data_t *pid_data;
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pid_data = (pid_analysis_data_t *)wmem_tree_lookup32(mp2t_data->pid_table, pid);
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if (!pid_data) {
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pid_data = wmem_new0(wmem_file_scope(), struct pid_analysis_data);
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pid_data->cc_prev = -1;
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pid_data->pid = pid;
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pid_data->frag_id = (pid << (32 - 13)) | 0x1;
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wmem_tree_insert32(mp2t_data->pid_table, pid, (void *)pid_data);
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}
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return pid_data;
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}
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/* Structure to handle packets, spanned across
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* multiple MPEG packets
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*/
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static reassembly_table mp2t_reassembly_table;
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static void
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mp2t_dissect_packet(tvbuff_t *tvb, enum pid_payload_type pload_type,
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packet_info *pinfo, proto_tree *tree)
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{
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dissector_handle_t handle = NULL;
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switch (pload_type) {
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case pid_pload_docsis:
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handle = docsis_handle;
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break;
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case pid_pload_pes:
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handle = mpeg_pes_handle;
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break;
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case pid_pload_sect:
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handle = mpeg_sect_handle;
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break;
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default:
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/* Should not happen */
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break;
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}
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if (handle)
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call_dissector(handle, tvb, pinfo, tree);
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else
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call_dissector(data_handle, tvb, pinfo, tree);
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}
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static guint
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mp2t_get_packet_length(tvbuff_t *tvb, guint offset, packet_info *pinfo,
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guint32 frag_id, enum pid_payload_type pload_type)
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{
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fragment_head *frag;
|
|
tvbuff_t *len_tvb = NULL, *frag_tvb = NULL, *data_tvb = NULL;
|
|
gint pkt_len = 0;
|
|
guint remaining_len;
|
|
|
|
frag = fragment_get(&mp2t_reassembly_table, pinfo, frag_id, NULL);
|
|
if (frag)
|
|
frag = frag->next;
|
|
|
|
if (!frag) { /* First frame */
|
|
remaining_len = tvb_reported_length_remaining(tvb, offset);
|
|
if ( (pload_type == pid_pload_docsis && remaining_len < 4) ||
|
|
(pload_type == pid_pload_sect && remaining_len < 3) ||
|
|
(pload_type == pid_pload_pes && remaining_len < 5) ) {
|
|
/* Not enough info to determine the size of the encapsulated packet */
|
|
/* Just add the fragment and we'll check out the length later */
|
|
return -1;
|
|
}
|
|
|
|
len_tvb = tvb;
|
|
} else {
|
|
/* Create a composite tvb out of the two */
|
|
frag_tvb = tvb_new_proxy(frag->tvb_data);
|
|
len_tvb = tvb_new_composite();
|
|
tvb_composite_append(len_tvb, frag_tvb);
|
|
|
|
data_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
tvb_composite_append(len_tvb, data_tvb);
|
|
tvb_composite_finalize(len_tvb);
|
|
|
|
offset = frag->offset;
|
|
}
|
|
|
|
/* Get the next packet's size if possible */
|
|
switch (pload_type) {
|
|
case pid_pload_docsis:
|
|
pkt_len = tvb_get_ntohs(len_tvb, offset + 2) + 6;
|
|
break;
|
|
case pid_pload_pes:
|
|
pkt_len = tvb_get_ntohs(len_tvb, offset + 4);
|
|
if (pkt_len) /* A size of 0 means size not bounded */
|
|
pkt_len += 6;
|
|
break;
|
|
case pid_pload_sect:
|
|
pkt_len = (tvb_get_ntohs(len_tvb, offset + 1) & 0xFFF) + 3;
|
|
break;
|
|
default:
|
|
/* Should not happen */
|
|
break;
|
|
}
|
|
|
|
if (frag_tvb)
|
|
tvb_free(frag_tvb);
|
|
|
|
return pkt_len;
|
|
}
|
|
|
|
static void
|
|
mp2t_fragment_handle(tvbuff_t *tvb, guint offset, packet_info *pinfo,
|
|
proto_tree *tree, guint32 frag_id,
|
|
guint frag_offset, guint frag_len,
|
|
gboolean fragment_last, enum pid_payload_type pload_type)
|
|
{
|
|
/* proto_item *ti; */
|
|
fragment_head *frag_msg;
|
|
tvbuff_t *new_tvb;
|
|
gboolean save_fragmented;
|
|
address save_src, save_dst;
|
|
|
|
save_fragmented = pinfo->fragmented;
|
|
pinfo->fragmented = TRUE;
|
|
copy_address_shallow(&save_src, &pinfo->src);
|
|
copy_address_shallow(&save_dst, &pinfo->dst);
|
|
|
|
/* It's possible that a fragment in the same packet set an address already
|
|
* This will change the hash value, we need to make sure it's NULL */
|
|
|
|
set_address(&pinfo->src, mp2t_no_address_type, 0, NULL);
|
|
set_address(&pinfo->dst, mp2t_no_address_type, 0, NULL);
|
|
|
|
/* check length; send frame for reassembly */
|
|
frag_msg = fragment_add_check(&mp2t_reassembly_table,
|
|
tvb, offset, pinfo, frag_id, NULL,
|
|
frag_offset,
|
|
frag_len,
|
|
!fragment_last);
|
|
|
|
new_tvb = process_reassembled_data(tvb, offset, pinfo,
|
|
"Reassembled MP2T",
|
|
frag_msg, &mp2t_msg_frag_items,
|
|
NULL, tree);
|
|
|
|
copy_address_shallow(&pinfo->src, &save_src);
|
|
copy_address_shallow(&pinfo->dst, &save_dst);
|
|
|
|
if (new_tvb) {
|
|
/* ti = */ proto_tree_add_item(tree, hf_msg_ts_packet_reassembled, tvb, 0, 0, ENC_NA);
|
|
mp2t_dissect_packet(new_tvb, pload_type, pinfo, tree);
|
|
} else {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "[MP2T fragment of a reassembled packet]");
|
|
}
|
|
|
|
pinfo->fragmented = save_fragmented;
|
|
}
|
|
|
|
|
|
/* Decoding of DOCSIS MAC frames within MPEG packets. MAC frames may begin anywhere
|
|
* within an MPEG packet or span multiple MPEG packets.
|
|
* payload_unit_start_indicator bit in MPEG header, and pointer field are used to
|
|
* decode fragmented DOCSIS frames within MPEG packet.
|
|
*-------------------------------------------------------------------------------
|
|
*MPEG Header | pointer_field | stuff_bytes | Start of MAC Frame #1 |
|
|
*(PUSI = 1) | (= 0) | (0 or more) |(up to 183 bytes) |
|
|
*-------------------------------------------------------------------------------
|
|
*-------------------------------------------------------------------------------
|
|
*MPEG Header | Continuation of MAC Frame #1 |
|
|
*(PUSI = 0) | (up to 183 bytes) |
|
|
*-------------------------------------------------------------------------------
|
|
*-------------------------------------------------------------------------------
|
|
*MPEG Header | pointer_field |Tail of MAC Frame| stuff_bytes |Start of MAC Frame|
|
|
*(PUSI = 1) | (= M) | #1 (M bytes) | (0 or more) |# 2 (N bytes) |
|
|
*-------------------------------------------------------------------------------
|
|
* Source - Data-Over-Cable Service Interface Specifications
|
|
* CM-SP-DRFI-I07-081209
|
|
*/
|
|
static void
|
|
mp2t_process_fragmented_payload(tvbuff_t *tvb, gint offset, guint remaining_len, packet_info *pinfo,
|
|
proto_tree *tree, proto_tree *header_tree, guint32 pusi_flag,
|
|
pid_analysis_data_t *pid_analysis)
|
|
{
|
|
tvbuff_t *next_tvb;
|
|
guint8 pointer = 0;
|
|
proto_item *pi;
|
|
guint stuff_len = 0;
|
|
proto_tree *stuff_tree;
|
|
packet_analysis_data_t *pdata = NULL;
|
|
subpacket_analysis_data_t *spdata = NULL;
|
|
guint32 frag_cur_pos = 0, frag_tot_len = 0;
|
|
gboolean fragmentation = FALSE;
|
|
guint32 frag_id = 0;
|
|
|
|
if (pusi_flag && pid_analysis->pload_type == pid_pload_unknown
|
|
&& remaining_len > 3) {
|
|
/* We should already have identified if it was a DOCSIS packet
|
|
* Remaining possibility is PES or SECT */
|
|
if (tvb_get_ntoh24(tvb, offset) == 0x000001) {
|
|
/* Looks like a PES packet to me ... */
|
|
pid_analysis->pload_type = pid_pload_pes;
|
|
} else {
|
|
/* Most probably a SECT packet */
|
|
pid_analysis->pload_type = pid_pload_sect;
|
|
}
|
|
}
|
|
|
|
/* Unable to determine the payload type, do nothing */
|
|
if (pid_analysis->pload_type == pid_pload_unknown)
|
|
return;
|
|
|
|
/* PES packet don't have pointer fields, others do */
|
|
if (pusi_flag && pid_analysis->pload_type != pid_pload_pes) {
|
|
pointer = tvb_get_guint8(tvb, offset);
|
|
pi = proto_tree_add_item(header_tree, hf_mp2t_pointer, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
remaining_len--;
|
|
if (pointer > remaining_len) {
|
|
/* Bogus pointer */
|
|
expert_add_info_format(pinfo, pi, &ei_mp2t_pointer,
|
|
"Pointer value is too large (> remaining data length %u)",
|
|
remaining_len);
|
|
}
|
|
}
|
|
|
|
if (!pinfo->fd->flags.visited) {
|
|
/* Get values from our current PID analysis */
|
|
frag_cur_pos = pid_analysis->frag_cur_pos;
|
|
frag_tot_len = pid_analysis->frag_tot_len;
|
|
fragmentation = pid_analysis->fragmentation;
|
|
frag_id = pid_analysis->frag_id;
|
|
pdata = (packet_analysis_data_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_mp2t, 0);
|
|
if (!pdata) {
|
|
pdata = wmem_new0(wmem_file_scope(), packet_analysis_data_t);
|
|
pdata->subpacket_table = wmem_tree_new(wmem_file_scope());
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_mp2t, 0, pdata);
|
|
|
|
} else {
|
|
spdata = (subpacket_analysis_data_t *)wmem_tree_lookup32(pdata->subpacket_table, offset);
|
|
}
|
|
|
|
if (!spdata) {
|
|
spdata = wmem_new0(wmem_file_scope(), subpacket_analysis_data_t);
|
|
/* Save the info into pdata from pid_analysis */
|
|
spdata->frag_cur_pos = frag_cur_pos;
|
|
spdata->frag_tot_len = frag_tot_len;
|
|
spdata->fragmentation = fragmentation;
|
|
spdata->frag_id = frag_id;
|
|
wmem_tree_insert32(pdata->subpacket_table, offset, (void *)spdata);
|
|
}
|
|
} else {
|
|
/* Get saved values */
|
|
pdata = (packet_analysis_data_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_mp2t, 0);
|
|
if (!pdata) {
|
|
/* Occurs for the first packets in the capture which cannot be reassembled */
|
|
return;
|
|
}
|
|
|
|
spdata = (subpacket_analysis_data_t *)wmem_tree_lookup32(pdata->subpacket_table, offset);
|
|
if (!spdata) {
|
|
/* Occurs for the first sub packets in the capture which cannot be reassembled */
|
|
return;
|
|
}
|
|
|
|
frag_cur_pos = spdata->frag_cur_pos;
|
|
frag_tot_len = spdata->frag_tot_len;
|
|
fragmentation = spdata->fragmentation;
|
|
frag_id = spdata->frag_id;
|
|
}
|
|
|
|
if (frag_tot_len == (guint)-1) {
|
|
frag_tot_len = mp2t_get_packet_length(tvb, offset, pinfo, frag_id, pid_analysis->pload_type);
|
|
|
|
if (frag_tot_len == (guint)-1) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/* The beginning of a new packet is present */
|
|
if (pusi_flag) {
|
|
if (pointer > remaining_len) {
|
|
/*
|
|
* Quit, so we don't use the bogus pointer value;
|
|
* that could cause remaining_len to become
|
|
* "negative", meaning it becomes a very large
|
|
* positive value.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/* "pointer" contains the number of bytes until the
|
|
* start of the new section
|
|
*
|
|
* if the new section does not start immediately after the
|
|
* pointer field (i.e. pointer>0), the remaining bytes before the
|
|
* start of the section are another fragment of the
|
|
* current packet
|
|
*
|
|
* if pointer is 0, a new upper-layer packet starts at the
|
|
* beginning of this TS packet
|
|
* if we have pending fragments, the last TS packet contained the
|
|
* last fragment and at the time we processed it, we couldn't figure
|
|
* out that it is the last fragment
|
|
* this is the case e.g. for PES packets with a 0 length field
|
|
* ("unbounded length")
|
|
* to handle this case, we add an empty fragment (pointer==0)
|
|
* and reassemble, then we process the current TS packet as
|
|
* usual
|
|
*/
|
|
if (fragmentation) {
|
|
mp2t_fragment_handle(tvb, offset, pinfo, tree, frag_id, frag_cur_pos,
|
|
pointer, TRUE, pid_analysis->pload_type);
|
|
frag_id++;
|
|
}
|
|
|
|
offset += pointer;
|
|
remaining_len -= pointer;
|
|
fragmentation = FALSE;
|
|
frag_cur_pos = 0;
|
|
frag_tot_len = 0;
|
|
|
|
if (!remaining_len) {
|
|
/* Shouldn't happen */
|
|
goto save_state;
|
|
}
|
|
|
|
while (remaining_len > 0) {
|
|
/* Don't like subsequent packets overwrite the Info column */
|
|
col_append_str(pinfo->cinfo, COL_INFO, " ");
|
|
col_set_fence(pinfo->cinfo, COL_INFO);
|
|
|
|
/* Skip stuff bytes */
|
|
stuff_len = 0;
|
|
while ((tvb_get_guint8(tvb, offset + stuff_len) == 0xFF)) {
|
|
stuff_len++;
|
|
if (stuff_len >= remaining_len) {
|
|
remaining_len = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (stuff_len) {
|
|
stuff_tree = proto_tree_add_subtree_format(tree, tvb, offset, stuff_len, ett_stuff, NULL, "Stuffing");
|
|
proto_tree_add_item(stuff_tree, hf_mp2t_stuff_bytes, tvb, offset, stuff_len, ENC_NA);
|
|
offset += stuff_len;
|
|
if (stuff_len >= remaining_len) {
|
|
goto save_state;
|
|
}
|
|
remaining_len -= stuff_len;
|
|
}
|
|
|
|
/* Get the next packet's size if possible */
|
|
frag_tot_len = mp2t_get_packet_length(tvb, offset, pinfo, frag_id, pid_analysis->pload_type);
|
|
if (frag_tot_len == (guint)-1 || !frag_tot_len) {
|
|
mp2t_fragment_handle(tvb, offset, pinfo, tree, frag_id, 0, remaining_len, FALSE, pid_analysis->pload_type);
|
|
fragmentation = TRUE;
|
|
/*offset += remaining_len;*/
|
|
frag_cur_pos += remaining_len;
|
|
goto save_state;
|
|
}
|
|
|
|
/* Check for full packets within this TS frame */
|
|
if (frag_tot_len &&
|
|
frag_tot_len <= remaining_len) {
|
|
next_tvb = tvb_new_subset_length(tvb, offset, frag_tot_len);
|
|
mp2t_dissect_packet(next_tvb, pid_analysis->pload_type, pinfo, tree);
|
|
remaining_len -= frag_tot_len;
|
|
offset += frag_tot_len;
|
|
frag_tot_len = 0;
|
|
frag_id++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (remaining_len == 0) {
|
|
pid_analysis->frag_cur_pos = 0;
|
|
pid_analysis->frag_tot_len = 0;
|
|
goto save_state;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* There are remaining bytes. Add them to the fragment list */
|
|
|
|
if ((frag_tot_len && frag_cur_pos + remaining_len >= frag_tot_len) || (!frag_tot_len && pusi_flag)) {
|
|
mp2t_fragment_handle(tvb, offset, pinfo, tree, frag_id, frag_cur_pos, remaining_len, TRUE, pid_analysis->pload_type);
|
|
frag_id++;
|
|
fragmentation = FALSE;
|
|
frag_cur_pos = 0;
|
|
frag_tot_len = 0;
|
|
} else {
|
|
mp2t_fragment_handle(tvb, offset, pinfo, tree, frag_id, frag_cur_pos, remaining_len, FALSE, pid_analysis->pload_type);
|
|
fragmentation = TRUE;
|
|
frag_cur_pos += remaining_len;
|
|
}
|
|
|
|
save_state:
|
|
pid_analysis->fragmentation = fragmentation;
|
|
pid_analysis->frag_cur_pos = frag_cur_pos;
|
|
pid_analysis->frag_tot_len = frag_tot_len;
|
|
pid_analysis->frag_id = frag_id;
|
|
}
|
|
|
|
|
|
|
|
/* Calc the number of skipped CC numbers. Note that this can easy
|
|
* overflow, and a value above 7 indicate several network packets
|
|
* could be lost.
|
|
*/
|
|
static guint32
|
|
calc_skips(gint32 curr, gint32 prev)
|
|
{
|
|
int res;
|
|
|
|
/* Only count the missing TS frames in between prev and curr.
|
|
* The "prev" frame CC number seen is confirmed received, it's
|
|
* the next frames CC counter which is the first known missing
|
|
* TS frame
|
|
*/
|
|
prev += 1;
|
|
|
|
/* Calc missing TS frame 'skips' */
|
|
res = curr - prev;
|
|
|
|
/* Handle wrap around */
|
|
if (res < 0)
|
|
res += 16;
|
|
|
|
return res;
|
|
}
|
|
|
|
#define KEY(pid, cc) ((pid << 4)|cc)
|
|
|
|
static guint32
|
|
detect_cc_drops(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo,
|
|
guint32 pid, gint32 cc_curr, mp2t_analysis_data_t *mp2t_data)
|
|
{
|
|
gint32 cc_prev = -1;
|
|
pid_analysis_data_t *pid_data = NULL;
|
|
ts_analysis_data_t *ts_data = NULL;
|
|
frame_analysis_data_t *frame_analysis_data_p = NULL;
|
|
proto_item *flags_item;
|
|
|
|
gboolean detected_drop = FALSE;
|
|
guint32 skips = 0;
|
|
|
|
/* The initial sequential processing stage */
|
|
if (!pinfo->fd->flags.visited) {
|
|
/* This is the sequential processing stage */
|
|
pid_data = get_pid_analysis(mp2t_data, pid);
|
|
|
|
cc_prev = pid_data->cc_prev;
|
|
pid_data->cc_prev = cc_curr;
|
|
|
|
/* Null packet always have a CC value equal 0 */
|
|
if (pid == 0x1fff)
|
|
return 0;
|
|
|
|
/* Its allowed that (cc_prev == cc_curr) if adaptation field */
|
|
if (cc_prev == cc_curr)
|
|
return 0;
|
|
|
|
/* Have not seen this pid before */
|
|
if (cc_prev == -1)
|
|
return 0;
|
|
|
|
/* Detect if CC is not increasing by one all the time */
|
|
if (cc_curr != ((cc_prev+1) & MP2T_CC_MASK)) {
|
|
detected_drop = TRUE;
|
|
|
|
skips = calc_skips(cc_curr, cc_prev);
|
|
|
|
mp2t_data->total_skips += skips;
|
|
mp2t_data->total_discontinuity++;
|
|
/* TODO: if (skips > 7) signal_loss++; ??? */
|
|
}
|
|
}
|
|
|
|
/* Save the info about the dropped packet */
|
|
if (detected_drop && !pinfo->fd->flags.visited) {
|
|
/* Lookup frame data, contains TS pid data objects */
|
|
frame_analysis_data_p = get_frame_analysis_data(mp2t_data, pinfo);
|
|
if (!frame_analysis_data_p)
|
|
frame_analysis_data_p = init_frame_analysis_data(mp2t_data, pinfo);
|
|
|
|
/* Create and store a new TS frame pid_data object.
|
|
This indicate that we have a drop
|
|
*/
|
|
ts_data = wmem_new0(wmem_file_scope(), struct ts_analysis_data);
|
|
ts_data->cc_prev = cc_prev;
|
|
ts_data->pid = pid;
|
|
ts_data->skips = skips;
|
|
wmem_tree_insert32(frame_analysis_data_p->ts_table, KEY(pid, cc_curr),
|
|
(void *)ts_data);
|
|
}
|
|
|
|
/* See if we stored info about drops */
|
|
if (pinfo->fd->flags.visited) {
|
|
|
|
/* Lookup frame data, contains TS pid data objects */
|
|
frame_analysis_data_p = get_frame_analysis_data(mp2t_data, pinfo);
|
|
if (!frame_analysis_data_p)
|
|
return 0; /* No stored frame data -> no drops*/
|
|
else {
|
|
ts_data = (struct ts_analysis_data *)wmem_tree_lookup32(frame_analysis_data_p->ts_table,
|
|
KEY(pid, cc_curr));
|
|
|
|
if (ts_data) {
|
|
if (ts_data->skips > 0) {
|
|
detected_drop = TRUE;
|
|
cc_prev = ts_data->cc_prev;
|
|
skips = ts_data->skips;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Add info to the proto tree about drops */
|
|
if (detected_drop) {
|
|
expert_add_info_format(pinfo, tree, &ei_mp2t_cc_drop,
|
|
"Detected %d missing TS frames before this (last_cc:%d total skips:%d discontinuity:%d)",
|
|
skips, cc_prev,
|
|
mp2t_data->total_skips,
|
|
mp2t_data->total_discontinuity
|
|
);
|
|
|
|
flags_item = proto_tree_add_uint(tree, hf_mp2t_analysis_skips,
|
|
tvb, 0, 0, skips);
|
|
PROTO_ITEM_SET_GENERATED(flags_item);
|
|
|
|
flags_item = proto_tree_add_uint(tree, hf_mp2t_analysis_drops,
|
|
tvb, 0, 0, 1);
|
|
PROTO_ITEM_SET_GENERATED(flags_item);
|
|
}
|
|
return skips;
|
|
}
|
|
|
|
static gint
|
|
dissect_mp2t_adaptation_field(tvbuff_t *tvb, gint offset, proto_tree *tree)
|
|
{
|
|
gint af_start_offset;
|
|
proto_item *hi;
|
|
proto_tree *mp2t_af_tree;
|
|
guint8 af_length;
|
|
guint8 af_flags;
|
|
gint stuffing_len;
|
|
|
|
af_length = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(tree, hf_mp2t_af_length, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
/* fix issues where afc==3 but af_length==0
|
|
* Adaptaion field...spec section 2.4.3.5: The value 0 is for inserting a single
|
|
* stuffing byte in a Transport Stream packet. When the adaptation_field_control
|
|
* value is '11', the value of the adaptation_field_length shall be in the range 0 to 182.
|
|
*/
|
|
if (af_length == 0)
|
|
return offset;
|
|
|
|
af_start_offset = offset;
|
|
|
|
hi = proto_tree_add_item( tree, hf_mp2t_af, tvb, offset, af_length, ENC_NA);
|
|
mp2t_af_tree = proto_item_add_subtree( hi, ett_mp2t_af );
|
|
|
|
af_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_di, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_rai, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_espi, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_pcr_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_opcr_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_sp_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_tpd_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_afe_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
if (af_flags & MP2T_AF_PCR_MASK) {
|
|
guint64 pcr_base;
|
|
guint16 pcr_ext;
|
|
|
|
/* 33 bit PCR base, 6 bit reserved, 9 bit PCR ext */
|
|
pcr_base = tvb_get_ntoh48(tvb, offset) >> (48-33);
|
|
pcr_ext = (guint16)(tvb_get_ntoh48(tvb, offset) & 0x1FF);
|
|
|
|
proto_tree_add_uint64(mp2t_af_tree, hf_mp2t_af_pcr, tvb, offset, 6,
|
|
pcr_base*300 + pcr_ext);
|
|
|
|
offset += 6;
|
|
}
|
|
|
|
if (af_flags & MP2T_AF_OPCR_MASK) {
|
|
guint64 opcr_base;
|
|
guint16 opcr_ext;
|
|
|
|
/* the same format as PCR above */
|
|
opcr_base = tvb_get_ntoh48(tvb, offset) >> (48-33);
|
|
opcr_ext = (guint16)(tvb_get_ntoh48(tvb, offset) & 0x1FF);
|
|
|
|
proto_tree_add_uint64(mp2t_af_tree, hf_mp2t_af_opcr, tvb, offset, 6,
|
|
opcr_base*300 + opcr_ext);
|
|
|
|
offset += 6;
|
|
}
|
|
|
|
if (af_flags & MP2T_AF_SP_MASK) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_sc, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
}
|
|
|
|
if (af_flags & MP2T_AF_TPD_MASK) {
|
|
guint8 tpd_len;
|
|
|
|
tpd_len = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_tpd_length, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_tpd, tvb, offset, tpd_len, ENC_NA);
|
|
offset += tpd_len;
|
|
}
|
|
|
|
if (af_flags & MP2T_AF_AFE_MASK) {
|
|
guint8 e_len;
|
|
guint8 e_flags;
|
|
gint e_start_offset = offset;
|
|
gint reserved_len = 0;
|
|
|
|
e_len = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_length, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
e_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_ltw_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_pr_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_ss_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
if (e_flags & MP2T_AF_E_LTW_FLAG_MASK) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_ltwv_flag, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_ltwo, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
|
|
if (e_flags & MP2T_AF_E_PR_FLAG_MASK) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_pr_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_pr, tvb, offset, 3, ENC_BIG_ENDIAN);
|
|
offset += 3;
|
|
}
|
|
|
|
if (e_flags & MP2T_AF_E_SS_FLAG_MASK) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_st, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_dnau_32_30, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_m_1, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_dnau_29_15, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_m_2, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_dnau_14_0, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_m_3, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
}
|
|
|
|
reserved_len = (e_len + 1) - (offset - e_start_offset);
|
|
if (reserved_len > 0) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_e_reserved_bytes, tvb, offset, reserved_len, ENC_NA);
|
|
offset += reserved_len;
|
|
}
|
|
}
|
|
|
|
stuffing_len = af_length - (offset - af_start_offset);
|
|
if (stuffing_len > 0) {
|
|
proto_tree_add_item( mp2t_af_tree, hf_mp2t_af_stuffing_bytes, tvb, offset, stuffing_len, ENC_NA);
|
|
offset += stuffing_len;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static void
|
|
dissect_tsp(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree, conversation_t *conv)
|
|
{
|
|
guint32 header;
|
|
guint afc;
|
|
gint start_offset = offset;
|
|
gint payload_len;
|
|
mp2t_analysis_data_t *mp2t_data;
|
|
pid_analysis_data_t *pid_analysis;
|
|
|
|
guint32 skips;
|
|
guint32 pid;
|
|
guint32 cc;
|
|
guint32 pusi_flag;
|
|
|
|
guint32 tsc;
|
|
|
|
proto_item *ti;
|
|
proto_item *hi;
|
|
proto_item *item = NULL;
|
|
proto_tree *mp2t_tree;
|
|
proto_tree *mp2t_header_tree;
|
|
proto_tree *mp2t_analysis_tree;
|
|
proto_item *afci;
|
|
|
|
ti = proto_tree_add_item( tree, proto_mp2t, tvb, offset, MP2T_PACKET_SIZE, ENC_NA );
|
|
mp2t_tree = proto_item_add_subtree( ti, ett_mp2t );
|
|
|
|
header = tvb_get_ntohl(tvb, offset);
|
|
pusi_flag = (header & 0x00400000);
|
|
pid = (header & MP2T_PID_MASK) >> MP2T_PID_SHIFT;
|
|
tsc = (header & MP2T_TSC_MASK);
|
|
afc = (header & MP2T_AFC_MASK) >> MP2T_AFC_SHIFT;
|
|
cc = (header & MP2T_CC_MASK) >> MP2T_CC_SHIFT;
|
|
|
|
proto_item_append_text(ti, " PID=0x%x CC=%d", pid, cc);
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPEG TS");
|
|
|
|
hi = proto_tree_add_item( mp2t_tree, hf_mp2t_header, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
mp2t_header_tree = proto_item_add_subtree( hi, ett_mp2t_header );
|
|
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_sync_byte, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_tei, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_pusi, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_tp, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_pid, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_tsc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
afci = proto_tree_add_item( mp2t_header_tree, hf_mp2t_afc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item( mp2t_header_tree, hf_mp2t_cc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
mp2t_data = get_mp2t_conversation_data(conv);
|
|
|
|
pid_analysis = get_pid_analysis(mp2t_data, pid);
|
|
|
|
if (pid_analysis->pload_type == pid_pload_unknown) {
|
|
if (pid == MP2T_PID_NULL) {
|
|
pid_analysis->pload_type = pid_pload_null;
|
|
} else if (pid == MP2T_PID_DOCSIS) {
|
|
pid_analysis->pload_type = pid_pload_docsis;
|
|
}
|
|
}
|
|
|
|
if (pid_analysis->pload_type == pid_pload_docsis && (afc != 1)) {
|
|
/* DOCSIS packets should not have an adaptation field */
|
|
if (afc != 1) {
|
|
expert_add_info_format(pinfo, afci, &ei_mp2t_invalid_afc,
|
|
"Adaptation Field Control for DOCSIS packets must be 0x01");
|
|
}
|
|
}
|
|
|
|
if (pid_analysis->pload_type == pid_pload_null) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "NULL packet");
|
|
if (afc != 1) {
|
|
expert_add_info_format(pinfo, afci, &ei_mp2t_invalid_afc,
|
|
"Adaptation Field Control for NULL packets must be 0x01");
|
|
}
|
|
/* Nothing more to do */
|
|
return;
|
|
}
|
|
|
|
offset += 4;
|
|
|
|
/* Create a subtree for analysis stuff */
|
|
mp2t_analysis_tree = proto_tree_add_subtree_format(mp2t_tree, tvb, offset, 0, ett_mp2t_analysis, &item, "MPEG2 PCR Analysis");
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
|
|
skips = detect_cc_drops(tvb, mp2t_analysis_tree, pinfo, pid, cc, mp2t_data);
|
|
|
|
if (skips > 0)
|
|
proto_item_append_text(ti, " skips=%d", skips);
|
|
|
|
if (afc == 2 || afc == 3)
|
|
offset = dissect_mp2t_adaptation_field(tvb, offset, mp2t_tree);
|
|
|
|
if ((offset - start_offset) < MP2T_PACKET_SIZE)
|
|
payload_len = MP2T_PACKET_SIZE - (offset - start_offset);
|
|
else
|
|
payload_len = 0;
|
|
|
|
if (!payload_len)
|
|
return;
|
|
|
|
if (afc == 2) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Adaptation field only");
|
|
/* The rest of the packet is stuffing bytes */
|
|
proto_tree_add_item( mp2t_tree, hf_mp2t_stuff_bytes, tvb, offset, payload_len, ENC_NA);
|
|
offset += payload_len;
|
|
}
|
|
|
|
if (!tsc) {
|
|
mp2t_process_fragmented_payload(tvb, offset, payload_len, pinfo, tree, mp2t_tree, pusi_flag, pid_analysis);
|
|
} else {
|
|
/* Payload is scrambled */
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Scrambled TS payload");
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
dissect_mp2t( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ )
|
|
{
|
|
guint offset = 0;
|
|
conversation_t *conv;
|
|
|
|
conv = find_or_create_conversation(pinfo);
|
|
|
|
for (; tvb_reported_length_remaining(tvb, offset) >= MP2T_PACKET_SIZE; offset += MP2T_PACKET_SIZE) {
|
|
dissect_tsp(tvb, offset, pinfo, tree, conv);
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static gboolean
|
|
heur_dissect_mp2t( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_ )
|
|
{
|
|
gint length;
|
|
guint offset = 0;
|
|
|
|
length = tvb_reported_length_remaining(tvb, offset);
|
|
if (length == 0) {
|
|
/* Nothing to check for */
|
|
return FALSE;
|
|
}
|
|
if ((length % MP2T_PACKET_SIZE) != 0) {
|
|
/* Not a multiple of the MPEG-2 transport packet size */
|
|
return FALSE;
|
|
} else {
|
|
while (tvb_offset_exists(tvb, offset)) {
|
|
if (tvb_get_guint8(tvb, offset) != MP2T_SYNC_BYTE) {
|
|
/* No sync byte at the appropriate offset */
|
|
return FALSE;
|
|
}
|
|
offset += MP2T_PACKET_SIZE;
|
|
}
|
|
}
|
|
|
|
dissect_mp2t(tvb, pinfo, tree, data);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
static void
|
|
mp2t_init(void) {
|
|
reassembly_table_init(&mp2t_reassembly_table,
|
|
&addresses_reassembly_table_functions);
|
|
}
|
|
|
|
static void
|
|
mp2t_cleanup(void) {
|
|
reassembly_table_destroy(&mp2t_reassembly_table);
|
|
}
|
|
|
|
void
|
|
proto_register_mp2t(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_mp2t_header, {
|
|
"Header", "mp2t.header",
|
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_sync_byte, {
|
|
"Sync Byte", "mp2t.sync_byte",
|
|
FT_UINT32, BASE_HEX, VALS(mp2t_sync_byte_vals), MP2T_SYNC_BYTE_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_tei, {
|
|
"Transport Error Indicator", "mp2t.tei",
|
|
FT_UINT32, BASE_DEC, NULL, MP2T_TEI_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_pusi, {
|
|
"Payload Unit Start Indicator", "mp2t.pusi",
|
|
FT_UINT32, BASE_DEC, NULL, MP2T_PUSI_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_tp, {
|
|
"Transport Priority", "mp2t.tp",
|
|
FT_UINT32, BASE_DEC, NULL, MP2T_TP_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_pid, {
|
|
"PID", "mp2t.pid",
|
|
FT_UINT32, BASE_HEX, VALS(mp2t_pid_vals), MP2T_PID_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_tsc, {
|
|
"Transport Scrambling Control", "mp2t.tsc",
|
|
FT_UINT32, BASE_HEX, VALS(mp2t_tsc_vals), MP2T_TSC_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_afc, {
|
|
"Adaptation Field Control", "mp2t.afc",
|
|
FT_UINT32, BASE_HEX, VALS(mp2t_afc_vals) , MP2T_AFC_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_cc, {
|
|
"Continuity Counter", "mp2t.cc",
|
|
FT_UINT32, BASE_DEC, NULL, MP2T_CC_MASK, NULL, HFILL
|
|
} } ,
|
|
#if 0
|
|
{ &hf_mp2t_analysis_flags, {
|
|
"MPEG2-TS Analysis Flags", "mp2t.analysis.flags",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"This frame has some of the MPEG2 analysis flags set", HFILL
|
|
} } ,
|
|
#endif
|
|
{ &hf_mp2t_analysis_skips, {
|
|
"TS Continuity Counter Skips", "mp2t.analysis.skips",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Missing TS frames according to CC counter values", HFILL
|
|
} } ,
|
|
{ &hf_mp2t_analysis_drops, {
|
|
"Some frames dropped", "mp2t.analysis.drops",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Discontinuity: A number of TS frames were dropped", HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af, {
|
|
"Adaptation Field", "mp2t.af",
|
|
FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_length, {
|
|
"Adaptation Field Length", "mp2t.af.length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_di, {
|
|
"Discontinuity Indicator", "mp2t.af.di",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_DI_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_rai, {
|
|
"Random Access Indicator", "mp2t.af.rai",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_RAI_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_espi, {
|
|
"Elementary Stream Priority Indicator", "mp2t.af.espi",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_ESPI_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_pcr_flag, {
|
|
"PCR Flag", "mp2t.af.pcr_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_PCR_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_opcr_flag, {
|
|
"OPCR Flag", "mp2t.af.opcr_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_OPCR_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_sp_flag, {
|
|
"Splicing Point Flag", "mp2t.af.sp_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_SP_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_tpd_flag, {
|
|
"Transport Private Data Flag", "mp2t.af.tpd_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_TPD_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_afe_flag, {
|
|
"Adaptation Field Extension Flag", "mp2t.af.afe_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_AFE_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_pcr, {
|
|
"Program Clock Reference", "mp2t.af.pcr",
|
|
FT_UINT64, BASE_HEX, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_opcr, {
|
|
"Original Program Clock Reference", "mp2t.af.opcr",
|
|
FT_UINT64, BASE_HEX, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_sc, {
|
|
"Splice Countdown", "mp2t.af.sc",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_tpd_length, {
|
|
"Transport Private Data Length", "mp2t.af.tpd_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_tpd, {
|
|
"Transport Private Data", "mp2t.af.tpd",
|
|
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_length, {
|
|
"Adaptation Field Extension Length", "mp2t.af.e_length",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_ltw_flag, {
|
|
"LTW Flag", "mp2t.af.e.ltw_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_E_LTW_FLAG_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_pr_flag, {
|
|
"Piecewise Rate Flag", "mp2t.af.e.pr_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_E_PR_FLAG_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_ss_flag, {
|
|
"Seamless Splice Flag", "mp2t.af.e.ss_flag",
|
|
FT_UINT8, BASE_DEC, NULL, MP2T_AF_E_SS_FLAG_MASK, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_reserved, {
|
|
"Reserved", "mp2t.af.e.reserved",
|
|
FT_UINT8, BASE_DEC, NULL, 0x1F, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_reserved_bytes, {
|
|
"Reserved", "mp2t.af.e.reserved_bytes",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_stuffing_bytes, {
|
|
"Stuffing", "mp2t.af.stuffing_bytes",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_ltwv_flag, {
|
|
"LTW Valid Flag", "mp2t.af.e.ltwv_flag",
|
|
FT_UINT16, BASE_DEC, NULL, 0x8000, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_ltwo, {
|
|
"LTW Offset", "mp2t.af.e.ltwo",
|
|
FT_UINT16, BASE_DEC, NULL, 0x7FFF, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_pr_reserved, {
|
|
"Reserved", "mp2t.af.e.pr_reserved",
|
|
FT_UINT24, BASE_DEC, NULL, 0xC00000, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_pr, {
|
|
"Piecewise Rate", "mp2t.af.e.pr",
|
|
FT_UINT24, BASE_DEC, NULL, 0x3FFFFF, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_st, {
|
|
"Splice Type", "mp2t.af.e.st",
|
|
FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_dnau_32_30, {
|
|
"DTS Next AU[32...30]", "mp2t.af.e.dnau_32_30",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0E, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_m_1, {
|
|
"Marker Bit", "mp2t.af.e.m_1",
|
|
FT_UINT8, BASE_DEC, NULL, 0x01, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_dnau_29_15, {
|
|
"DTS Next AU[29...15]", "mp2t.af.e.dnau_29_15",
|
|
FT_UINT16, BASE_DEC, NULL, 0xFFFE, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_m_2, {
|
|
"Marker Bit", "mp2t.af.e.m_2",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0001, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_dnau_14_0, {
|
|
"DTS Next AU[14...0]", "mp2t.af.e.dnau_14_0",
|
|
FT_UINT16, BASE_DEC, NULL, 0xFFFE, NULL, HFILL
|
|
} } ,
|
|
{ &hf_mp2t_af_e_m_3, {
|
|
"Marker Bit", "mp2t.af.e.m_3",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0001, NULL, HFILL
|
|
} } ,
|
|
#if 0
|
|
{ &hf_mp2t_payload, {
|
|
"Payload", "mp2t.payload",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
} } ,
|
|
#endif
|
|
{ &hf_mp2t_stuff_bytes, {
|
|
"Stuffing", "mp2t.stuff_bytes",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
} },
|
|
{ &hf_mp2t_pointer, {
|
|
"Pointer", "mp2t.pointer",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragments, {
|
|
"Message fragments", "mp2t.msg.fragments",
|
|
FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment, {
|
|
"Message fragment", "mp2t.msg.fragment",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_overlap, {
|
|
"Message fragment overlap", "mp2t.msg.fragment.overlap",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_overlap_conflicts, {
|
|
"Message fragment overlapping with conflicting data",
|
|
"mp2t.msg.fragment.overlap.conflicts",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_multiple_tails, {
|
|
"Message has multiple tail fragments",
|
|
"mp2t.msg.fragment.multiple_tails",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_too_long_fragment, {
|
|
"Message fragment too long", "mp2t.msg.fragment.too_long_fragment",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_error, {
|
|
"Message defragmentation error", "mp2t.msg.fragment.error",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_fragment_count, {
|
|
"Message fragment count", "mp2t.msg.fragment.count",
|
|
FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_reassembled_in, {
|
|
"Reassembled in", "mp2t.msg.reassembled.in",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_reassembled_length, {
|
|
"Reassembled MP2T length", "mp2t.msg.reassembled.length",
|
|
FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
{ &hf_msg_ts_packet_reassembled, {
|
|
"MPEG TS Packet (reassembled)", "mp2t.ts_packet_reassembled",
|
|
FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL
|
|
} },
|
|
};
|
|
|
|
static gint *ett[] =
|
|
{
|
|
&ett_mp2t,
|
|
&ett_mp2t_header,
|
|
&ett_mp2t_af,
|
|
&ett_mp2t_analysis,
|
|
&ett_stuff,
|
|
&ett_msg_fragment,
|
|
&ett_msg_fragments
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_mp2t_pointer, { "mp2t.pointer_too_large", PI_MALFORMED, PI_ERROR, "Pointer value is too large", EXPFILL }},
|
|
{ &ei_mp2t_cc_drop, { "mp2t.cc.drop", PI_MALFORMED, PI_ERROR, "Detected missing TS frames", EXPFILL }},
|
|
{ &ei_mp2t_invalid_afc, { "mp2t.afc.invalid", PI_PROTOCOL, PI_WARN,
|
|
"Adaptation Field Control contains an invalid value", EXPFILL }}
|
|
};
|
|
|
|
expert_module_t* expert_mp2t;
|
|
|
|
proto_mp2t = proto_register_protocol("ISO/IEC 13818-1", "MP2T", "mp2t");
|
|
|
|
mp2t_handle = register_dissector("mp2t", dissect_mp2t, proto_mp2t);
|
|
|
|
proto_register_field_array(proto_mp2t, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_mp2t = expert_register_protocol(proto_mp2t);
|
|
expert_register_field_array(expert_mp2t, ei, array_length(ei));
|
|
|
|
mp2t_no_address_type = address_type_dissector_register("AT_MP2T_NONE", "No MP2T Address", none_addr_to_str, none_addr_str_len, NULL, none_addr_len, NULL, NULL);
|
|
|
|
heur_subdissector_list = register_heur_dissector_list("mp2t.pid");
|
|
/* Register init of processing of fragmented DEPI packets */
|
|
register_init_routine(mp2t_init);
|
|
register_cleanup_routine(mp2t_cleanup);
|
|
}
|
|
|
|
|
|
|
|
void
|
|
proto_reg_handoff_mp2t(void)
|
|
{
|
|
heur_dissector_add("udp", heur_dissect_mp2t, "MP2T over UDP", "mp2t_udp", proto_mp2t, HEURISTIC_ENABLE);
|
|
|
|
dissector_add_uint("rtp.pt", PT_MP2T, mp2t_handle);
|
|
dissector_add_for_decode_as("udp.port", mp2t_handle);
|
|
heur_dissector_add("usb.bulk", heur_dissect_mp2t, "MP2T USB bulk endpoint", "mp2t_usb_bulk", proto_mp2t, HEURISTIC_ENABLE);
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_MPEG_2_TS, mp2t_handle);
|
|
dissector_add_uint("l2tp.pw_type", L2TPv3_PROTOCOL_DOCSIS_DMPT, mp2t_handle);
|
|
|
|
docsis_handle = find_dissector("docsis");
|
|
mpeg_pes_handle = find_dissector("mpeg-pes");
|
|
mpeg_sect_handle = find_dissector("mpeg_sect");
|
|
data_handle = find_dissector("data");
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|