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wireshark/epan/dissectors/packet-mp2t.c
Michael Mann 9b7fb8a811 Create the ability to have packet scoped "proto" data. Bug 9470 (https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9470) 
I'm not sold on the name or module the proto_data functions live in, but I believe the function arguments are solid and gives us the most flexibility for the future.  And search/replace of a function name is easy enough to do.

The big driving force for getting this in sooner rather than later is the saved memory on ethernet packets (and IP packets soon), that used to have file_scope() proto data when all it needed was packet_scope() data (technically packet_info->pool scoped), strictly for Decode As.

All dissectors that use p_add_proto_data() only for Decode As functionality have been converted to using packet_scope().  All other dissectors were converted to using file_scope() which was the original scope for "proto" data.

svn path=/trunk/; revision=53520
2013-11-23 02:20:13 +00:00

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/* packet-mp2t.c
*
* Routines for RFC 2250 MPEG2 (ISO/IEC 13818-1) Transport Stream dissection
*
* $Id$
*
* Copyright 2006, Erwin Rol <erwin@erwinrol.com>
* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include <epan/rtp_pt.h>
#include <epan/wmem/wmem.h>
#include <epan/conversation.h>
#include <epan/expert.h>
#include <epan/reassemble.h>
#include <epan/tvbuff-int.h> /* XXX, for tvb_new_proxy() */
/* The MPEG2 TS packet size */
#define MP2T_PACKET_SIZE 188
#define MP2T_SYNC_BYTE 0x47
#define MP2T_PID_DOCSIS 0x1FFE
#define MP2T_PID_NULL 0x1FFF
static dissector_handle_t mp2t_handle;
static dissector_handle_t docsis_handle;
static dissector_handle_t mpeg_pes_handle;
static dissector_handle_t mpeg_sect_handle;
static dissector_handle_t data_handle;
static heur_dissector_list_t heur_subdissector_list;
static int proto_mp2t = -1;
static gint ett_mp2t = -1;
static gint ett_mp2t_header = -1;
static gint ett_mp2t_af = -1;
static gint ett_mp2t_analysis = -1;
static gint ett_stuff = -1;
static int hf_mp2t_header = -1;
static int hf_mp2t_sync_byte = -1;
static int hf_mp2t_tei = -1;
static int hf_mp2t_pusi = -1;
static int hf_mp2t_tp = -1;
static int hf_mp2t_pid = -1;
static int hf_mp2t_tsc = -1;
static int hf_mp2t_afc = -1;
static int hf_mp2t_cc = -1;
/* static int hf_mp2t_analysis_flags = -1; */
static int hf_mp2t_analysis_skips = -1;
static int hf_mp2t_analysis_drops = -1;
#define MP2T_SYNC_BYTE_MASK 0xFF000000
#define MP2T_TEI_MASK 0x00800000
#define MP2T_PUSI_MASK 0x00400000
#define MP2T_TP_MASK 0x00200000
#define MP2T_PID_MASK 0x001FFF00
#define MP2T_TSC_MASK 0x000000C0
#define MP2T_AFC_MASK 0x00000030
#define MP2T_CC_MASK 0x0000000F
#define MP2T_SYNC_BYTE_SHIFT 24
#define MP2T_TEI_SHIFT 23
#define MP2T_PUSI_SHIFT 22
#define MP2T_TP_SHIFT 21
#define MP2T_PID_SHIFT 8
#define MP2T_TSC_SHIFT 6
#define MP2T_AFC_SHIFT 4
#define MP2T_CC_SHIFT 0
static int hf_mp2t_af = -1;
static int hf_mp2t_af_length = -1;
static int hf_mp2t_af_di = -1;
static int hf_mp2t_af_rai = -1;
static int hf_mp2t_af_espi = -1;
static int hf_mp2t_af_pcr_flag = -1;
static int hf_mp2t_af_opcr_flag = -1;
static int hf_mp2t_af_sp_flag = -1;
static int hf_mp2t_af_tpd_flag = -1;
static int hf_mp2t_af_afe_flag = -1;
#define MP2T_AF_DI_MASK 0x80
#define MP2T_AF_RAI_MASK 0x40
#define MP2T_AF_ESPI_MASK 0x20
#define MP2T_AF_PCR_MASK 0x10
#define MP2T_AF_OPCR_MASK 0x08
#define MP2T_AF_SP_MASK 0x04
#define MP2T_AF_TPD_MASK 0x02
#define MP2T_AF_AFE_MASK 0x01
#define MP2T_AF_DI_SHIFT 7
#define MP2T_AF_RAI_SHIFT 6
#define MP2T_AF_ESPI_SHIFT 5
#define MP2T_AF_PCR_SHIFT 4
#define MP2T_AF_OPCR_SHIFT 3
#define MP2T_AF_SP_SHIFT 2
#define MP2T_AF_TPD_SHIFT 1
#define MP2T_AF_AFE_SHIFT 0
static int hf_mp2t_af_pcr = -1;
static int hf_mp2t_af_opcr = -1;
static int hf_mp2t_af_sc = -1;
static int hf_mp2t_af_tpd_length = -1;
static int hf_mp2t_af_tpd = -1;
static int hf_mp2t_af_e_length = -1;
static int hf_mp2t_af_e_ltw_flag = -1;
static int hf_mp2t_af_e_pr_flag = -1;
static int hf_mp2t_af_e_ss_flag = -1;
static int hf_mp2t_af_e_reserved = -1;
#define MP2T_AF_E_LTW_FLAG_MASK 0x80
#define MP2T_AF_E_PR_FLAG_MASK 0x40
#define MP2T_AF_E_SS_FLAG_MASK 0x20
static int hf_mp2t_af_e_reserved_bytes = -1;
static int hf_mp2t_af_stuffing_bytes = -1;
static int hf_mp2t_af_e_ltwv_flag = -1;
static int hf_mp2t_af_e_ltwo = -1;
static int hf_mp2t_af_e_pr_reserved = -1;
static int hf_mp2t_af_e_pr = -1;
static int hf_mp2t_af_e_st = -1;
static int hf_mp2t_af_e_dnau_32_30 = -1;
static int hf_mp2t_af_e_m_1 = -1;
static int hf_mp2t_af_e_dnau_29_15 = -1;
static int hf_mp2t_af_e_m_2 = -1;
static int hf_mp2t_af_e_dnau_14_0 = -1;
static int hf_mp2t_af_e_m_3 = -1;
/* static int hf_mp2t_payload = -1; */
static int hf_mp2t_stuff_bytes = -1;
static int hf_mp2t_pointer = -1;
static const value_string mp2t_sync_byte_vals[] = {
{ MP2T_SYNC_BYTE, "Correct" },
{ 0, NULL }
};
static const value_string mp2t_pid_vals[] = {
{ 0x0000, "Program Association Table" },
{ 0x0001, "Conditional Access Table" },
{ 0x0002, "Transport Stream Description Table" },
{ 0x0003, "Reserved" },
{ 0x0004, "Reserved" },
{ 0x0005, "Reserved" },
{ 0x0006, "Reserved" },
{ 0x0007, "Reserved" },
{ 0x0008, "Reserved" },
{ 0x0009, "Reserved" },
{ 0x000A, "Reserved" },
{ 0x000B, "Reserved" },
{ 0x000C, "Reserved" },
{ 0x000D, "Reserved" },
{ 0x000E, "Reserved" },
{ 0x000F, "Reserved" },
{ 0x1FFE, "DOCSIS Data-over-cable well-known PID" },
{ 0x1FFF, "Null packet" },
{ 0, NULL }
};
/* Values below according ETSI ETR 289 */
static const value_string mp2t_tsc_vals[] = {
{ 0, "Not scrambled" },
{ 1, "Reserved" },
{ 2, "Packet scrambled with Even Key" },
{ 3, "Packet scrambled with Odd Key" },
{ 0, NULL }
};
static const value_string mp2t_afc_vals[] = {
{ 0, "Reserved" },
{ 1, "Payload only" },
{ 2, "Adaptation Field only" },
{ 3, "Adaptation Field and Payload" },
{ 0, NULL }
};
static gint ett_msg_fragment = -1;
static gint ett_msg_fragments = -1;
static int hf_msg_fragments = -1;
static int hf_msg_fragment = -1;
static int hf_msg_fragment_overlap = -1;
static int hf_msg_fragment_overlap_conflicts = -1;
static int hf_msg_fragment_multiple_tails = -1;
static int hf_msg_fragment_too_long_fragment = -1;
static int hf_msg_fragment_error = -1;
static int hf_msg_fragment_count = -1;
static int hf_msg_reassembled_in = -1;
static int hf_msg_reassembled_length = -1;
static expert_field ei_mp2t_pointer = EI_INIT;
static expert_field ei_mp2t_cc_drop = EI_INIT;
static const fragment_items mp2t_msg_frag_items = {
/* Fragment subtrees */
&ett_msg_fragment,
&ett_msg_fragments,
/* Fragment fields */
&hf_msg_fragments,
&hf_msg_fragment,
&hf_msg_fragment_overlap,
&hf_msg_fragment_overlap_conflicts,
&hf_msg_fragment_multiple_tails,
&hf_msg_fragment_too_long_fragment,
&hf_msg_fragment_error,
&hf_msg_fragment_count,
/* Reassembled in field */
&hf_msg_reassembled_in,
/* Reassembled length field */
&hf_msg_reassembled_length,
/* Reassembled data field */
NULL,
/* Tag */
"Message fragments"
};
/* Data structure used for detecting CC drops
*
* conversation
* |
* +-> mp2t_analysis_data
* |
* +-> pid_table (RB tree) (key: pid)
* | |
* | +-> pid_analysis_data (per pid)
* | +-> pid_analysis_data
* | +-> pid_analysis_data
* |
* +-> frame_table (RB tree) (key: pinfo->fd->num)
* |
* +-> frame_analysis_data (only created if drop detected)
* |
* +-> ts_table (RB tree)
* |
* +-> ts_analysis_data (per TS subframe)
* +-> ts_analysis_data
* +-> ts_analysis_data
*/
typedef struct mp2t_analysis_data {
/* This structure contains a tree containing data for the
* individual pid's, this is only used when packets are
* processed sequencially.
*/
wmem_tree_t *pid_table;
/* When detecting a CC drop, store that information for the
* given frame. This info is needed, when clicking around in
* wireshark, as the pid table data only makes sense during
* sequential processing. The flag pinfo->fd->flags.visited is
* used to tell the difference.
*
*/
wmem_tree_t *frame_table;
/* Total counters per conversation / multicast stream */
guint32 total_skips;
guint32 total_discontinuity;
} mp2t_analysis_data_t;
enum pid_payload_type {
pid_pload_unknown,
pid_pload_docsis,
pid_pload_pes,
pid_pload_sect,
pid_pload_null
};
typedef struct subpacket_analysis_data {
guint32 frag_cur_pos;
guint32 frag_tot_len;
gboolean fragmentation;
guint32 frag_id;
} subpacket_analysis_data_t;
typedef struct packet_analysis_data {
/* Contain information for each MPEG2-TS packet in the current big packet */
wmem_tree_t *subpacket_table;
} packet_analysis_data_t;
/* Analysis TS frame info needed during sequential processing */
typedef struct pid_analysis_data {
guint16 pid;
gint8 cc_prev; /* Previous CC number */
enum pid_payload_type pload_type;
/* Fragments information used for first pass */
gboolean fragmentation;
guint32 frag_cur_pos;
guint32 frag_tot_len;
guint32 frag_id;
} pid_analysis_data_t;
/* Analysis info stored for a TS frame */
typedef struct ts_analysis_data {
guint16 pid;
gint8 cc_prev; /* Previous CC number */
guint8 skips; /* Skips between CCs max 14 */
} ts_analysis_data_t;
typedef struct frame_analysis_data {
/* As each frame has several pid's, thus need a pid data
* structure per TS frame.
*/
wmem_tree_t *ts_table;
} frame_analysis_data_t;
static mp2t_analysis_data_t *
init_mp2t_conversation_data(void)
{
mp2t_analysis_data_t *mp2t_data = NULL;
mp2t_data = wmem_new0(wmem_file_scope(), struct mp2t_analysis_data);
mp2t_data->pid_table = wmem_tree_new(wmem_file_scope());
mp2t_data->frame_table = wmem_tree_new(wmem_file_scope());
mp2t_data->total_skips = 0;
mp2t_data->total_discontinuity = 0;
return mp2t_data;
}
static mp2t_analysis_data_t *
get_mp2t_conversation_data(conversation_t *conv)
{
mp2t_analysis_data_t *mp2t_data = NULL;
mp2t_data = (mp2t_analysis_data_t *)conversation_get_proto_data(conv, proto_mp2t);
if (!mp2t_data) {
mp2t_data = init_mp2t_conversation_data();
conversation_add_proto_data(conv, proto_mp2t, mp2t_data);
}
return mp2t_data;
}
static frame_analysis_data_t *
init_frame_analysis_data(mp2t_analysis_data_t *mp2t_data, packet_info *pinfo)
{
frame_analysis_data_t *frame_analysis_data_p = NULL;
frame_analysis_data_p = wmem_new0(wmem_file_scope(), struct frame_analysis_data);
frame_analysis_data_p->ts_table = wmem_tree_new(wmem_file_scope());
/* Insert into mp2t tree */
wmem_tree_insert32(mp2t_data->frame_table, pinfo->fd->num,
(void *)frame_analysis_data_p);
return frame_analysis_data_p;
}
static frame_analysis_data_t *
get_frame_analysis_data(mp2t_analysis_data_t *mp2t_data, packet_info *pinfo)
{
frame_analysis_data_t *frame_analysis_data_p = NULL;
frame_analysis_data_p = (frame_analysis_data_t *)wmem_tree_lookup32(mp2t_data->frame_table, pinfo->fd->num);
return frame_analysis_data_p;
}
static pid_analysis_data_t *
get_pid_analysis(guint32 pid, conversation_t *conv)
{
pid_analysis_data_t *pid_data = NULL;
mp2t_analysis_data_t *mp2t_data = NULL;
mp2t_data = get_mp2t_conversation_data(conv);
pid_data = (pid_analysis_data_t *)wmem_tree_lookup32(mp2t_data->pid_table, pid);
if (!pid_data) {
pid_data = wmem_new0(wmem_file_scope(), struct pid_analysis_data);
pid_data->cc_prev = -1;
pid_data->pid = pid;
pid_data->frag_id = (pid << (32 - 13)) | 0x1;
wmem_tree_insert32(mp2t_data->pid_table, pid, (void *)pid_data);
}
return pid_data;
}
/* Structure to handle packets, spanned across
* multiple MPEG packets
*/
static reassembly_table mp2t_reassembly_table;
static void
mp2t_dissect_packet(tvbuff_t *tvb, enum pid_payload_type pload_type,
packet_info *pinfo, proto_tree *tree)
{
dissector_handle_t handle = NULL;
switch (pload_type) {
case pid_pload_docsis:
handle = docsis_handle;
break;
case pid_pload_pes:
handle = mpeg_pes_handle;
break;
case pid_pload_sect:
handle = mpeg_sect_handle;
break;
default:
/* Should not happen */
break;
}
if (handle)
call_dissector(handle, tvb, pinfo, tree);
else
call_dissector(data_handle, tvb, pinfo, tree);
}
guint
mp2t_get_packet_length(tvbuff_t *tvb, guint offset, packet_info *pinfo,
guint32 frag_id, enum pid_payload_type pload_type)
{
fragment_head *frag = NULL;
tvbuff_t *len_tvb = NULL, *frag_tvb = NULL, *data_tvb = NULL;
gint pkt_len = 0;
guint remaining_len;
remaining_len = tvb_length_remaining(tvb, offset);
frag = fragment_get(&mp2t_reassembly_table, pinfo, frag_id, NULL);
if (frag)
frag = frag->next;
if (!frag) { /* First frame */
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 encapulated 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 = NULL;
tvbuff_t *new_tvb = NULL;
gboolean save_fragmented;
save_fragmented = pinfo->fragmented;
pinfo->fragmented = TRUE;
/* 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);
if (new_tvb) {
/* ti = */ proto_tree_add_text(tree, tvb, 0, 0, "MPEG TS Packet (reassembled)");
mp2t_dissect_packet(new_tvb, pload_type, pinfo, tree);
}
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_item *si;
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>0 && 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) {
/* 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) {
si = proto_tree_add_text(tree, tvb, offset, stuff_len, "Stuffing");
stuff_tree = proto_item_add_subtree(si, ett_stuff);
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(tvb, offset, frag_tot_len, 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;
} 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 = 0;
/* 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, conversation_t *conv)
{
gint32 cc_prev = -1;
pid_analysis_data_t *pid_data = NULL;
ts_analysis_data_t *ts_data = NULL;
mp2t_analysis_data_t *mp2t_data = NULL;
frame_analysis_data_t *frame_analysis_data_p = NULL;
proto_item *flags_item;
guint32 detected_drop = 0;
guint32 skips = 0;
mp2t_data = get_mp2t_conversation_data(conv);
/* The initial sequencial processing stage */
if (!pinfo->fd->flags.visited) {
/* This is the sequencial processing stage */
pid_data = get_pid_analysis(pid, conv);
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 = 1;
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 = 1;
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, guint8 af_length,
packet_info *pinfo _U_, proto_tree *tree)
{
gint af_start_offset;
proto_item *hi;
proto_tree *mp2t_af_tree;
guint8 af_flags;
gint stuffing_len;
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 = 0;
guint32 pcr_ext = 0;
guint8 tmp;
tmp = tvb_get_guint8(tvb, offset);
pcr_base = (pcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
pcr_base = (pcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
pcr_base = (pcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
pcr_base = (pcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
pcr_base = (pcr_base << 1) | ((tmp >> 7) & 0x01);
pcr_ext = (tmp & 0x01);
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
pcr_ext = (pcr_ext << 8) | tmp;
offset += 1;
proto_tree_add_none_format(mp2t_af_tree, hf_mp2t_af_pcr, tvb, offset - 6, 6,
"Program Clock Reference: base(%" G_GINT64_MODIFIER "u) * 300 + ext(%u) = %" G_GINT64_MODIFIER "u",
pcr_base, pcr_ext, pcr_base * 300 + pcr_ext);
}
if (af_flags & MP2T_AF_OPCR_MASK) {
guint64 opcr_base = 0;
guint32 opcr_ext = 0;
guint8 tmp = 0;
tmp = tvb_get_guint8(tvb, offset);
opcr_base = (opcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
opcr_base = (opcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
opcr_base = (opcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
opcr_base = (opcr_base << 8) | tmp;
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
opcr_base = (opcr_base << 1) | ((tmp >> 7) & 0x01);
opcr_ext = (tmp & 0x01);
offset += 1;
tmp = tvb_get_guint8(tvb, offset);
opcr_ext = (opcr_ext << 8) | tmp;
offset += 1;
proto_tree_add_none_format(mp2t_af_tree, hf_mp2t_af_opcr, tvb, offset - 6, 6,
"Original Program Clock Reference: base(%" G_GINT64_MODIFIER "u) * 300 + ext(%u) = %" G_GINT64_MODIFIER "u",
opcr_base, opcr_ext, 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-af_start_offset;
}
static void
dissect_tsp(tvbuff_t *tvb, volatile gint offset, packet_info *pinfo,
proto_tree *tree, conversation_t *conv)
{
guint32 header;
guint afc;
guint8 af_length;
gint start_offset = offset;
volatile gint payload_len;
pid_analysis_data_t *pid_analysis;
guint32 skips;
guint32 pid;
guint32 cc;
guint32 pusi_flag;
guint32 tsc;
proto_item *ti = NULL;
proto_item *hi = NULL;
proto_item *item = NULL;
proto_tree *mp2t_tree = NULL;
proto_tree *mp2t_header_tree = NULL;
proto_tree *mp2t_analysis_tree = NULL;
proto_item *afci = NULL;
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);
pid = (header & MP2T_PID_MASK) >> MP2T_PID_SHIFT;
cc = (header & MP2T_CC_MASK) >> MP2T_CC_SHIFT;
tsc = (header & MP2T_TSC_MASK);
pusi_flag = (header & 0x00400000);
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);
afc = (header & MP2T_AFC_MASK) >> MP2T_AFC_SHIFT;
pid_analysis = get_pid_analysis(pid, conv);
/* Find out the payload type based on the payload */
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) {
/* DOCSIS packets should not have an adaptation field */
proto_item_append_text(afci, " (Invalid for DOCSIS packets, should be 0)");
}
if (pid_analysis->pload_type == pid_pload_null) {
/* Nothing more to do */
col_set_str(pinfo->cinfo, COL_INFO, "NULL packet");
proto_item_append_text(afci, " (Should be 0 for NULL packets)");
return;
}
offset += 4;
/* Create a subtree for analysis stuff */
item = proto_tree_add_text(mp2t_tree, tvb, offset, 0, "MPEG2 PCR Analysis");
PROTO_ITEM_SET_GENERATED(item);
mp2t_analysis_tree = proto_item_add_subtree(item, ett_mp2t_analysis);
skips = detect_cc_drops(tvb, mp2t_analysis_tree, pinfo, pid, cc, conv);
if (skips > 0)
proto_item_append_text(ti, " skips=%d", skips);
if (afc == 2 || afc == 3) {
af_length = tvb_get_guint8(tvb, offset);
proto_tree_add_item( mp2t_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)
offset += dissect_mp2t_adaptation_field(tvb, offset, af_length, pinfo, 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 void
dissect_mp2t( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
{
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);
}
}
static gboolean
heur_dissect_mp2t( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_ )
{
gint length;
guint offset = 0;
length = tvb_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);
return TRUE;
}
static void
mp2t_init(void) {
reassembly_table_init(&mp2t_reassembly_table,
&addresses_reassembly_table_functions);
}
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_NONE, BASE_NONE, NULL, 0, NULL, HFILL
} } ,
{ &hf_mp2t_af_opcr, {
"Original Program Clock Reference", "mp2t.af.opcr",
FT_NONE, BASE_NONE, 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
} }
};
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", 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 }},
};
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));
register_heur_dissector_list("mp2t.pid", &heur_subdissector_list);
/* Register init of processing of fragmented DEPI packets */
register_init_routine(mp2t_init);
}
void
proto_reg_handoff_mp2t(void)
{
heur_dissector_add("udp", heur_dissect_mp2t, proto_mp2t);
dissector_add_uint("rtp.pt", PT_MP2T, mp2t_handle);
dissector_add_handle("udp.port", mp2t_handle); /* for decode-as */
heur_dissector_add("usb.bulk", heur_dissect_mp2t, proto_mp2t);
dissector_add_uint("wtap_encap", WTAP_ENCAP_MPEG_2_TS, 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:
*/
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