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/* packet-tdmop.c
* Routines for TDM over Packet network disassembly
* Copyright 2015, Andrew Chernyh <andew.chernyh@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* TDMoP protocol is proprietary protocol developed by "NSC Communication Siberia Ltd."
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/prefs.h>
/*Using of ethertype 0x0808(assigned to Frame Relay ARP) was implemented in hardware, when ethertype was not assigned*/
#define ETHERTYPE_TDMOP 0
#define MAX_DCHANNEL_LEN 128
void proto_register_tdmop(void);
void proto_reg_handoff_tdmop(void);
static dissector_handle_t tdmop_handle;
static int proto_tdmop;
static int ett_tdmop;
static int ett_tdmop_channel;
static int hf_tdmop_TransferID;
static int hf_tdmop_DstCh;
static int hf_tdmop_SrcCh;
static int hf_tdmop_Flags;
static int hf_tdmop_Flags_no_data;
static int hf_tdmop_Flags_lost_request;
static int hf_tdmop_Flags_remote_no_data;
static int hf_tdmop_Flags_compressed;
static int hf_tdmop_SrcDst;
static int hf_tdmop_SeqNum;
static int hf_tdmop_LastRecv;
static int hf_tdmop_Delay;
static int hf_tdmop_Reserved;
static int hf_tdmop_payload;
static int hf_tdmop_Compression_mask;
static dissector_handle_t lapd_handle;
static int pref_tdmop_d_channel = 16;
static uint32_t pref_tdmop_mask = 0xFFFFFFFFUL;
static uint32_t pref_tdmop_ethertype = ETHERTYPE_TDMOP;
#define TDMOP_FLAG_NO_DATA (1<<3)
#define TDMOP_FLAG_REMOTE_NO_DATA (1<<2)
#define TDMOP_FLAG_COMPRESSED (1<<4)
#define TDMOP_FLAG_LOST_REQUEST ((1<<3)|(0x02))
static uint8_t reverse_map[256]=
{
0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF
};
static int dissect_tdmop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
uint8_t dchannel_data[MAX_DCHANNEL_LEN];
unsigned dchannel_len;
uint8_t flags;
int offset;
proto_item *ti;
proto_tree *tdmop_tree;
uint32_t dstch, srcch;
flags = tvb_get_uint8(tvb, 4);
offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TDMoP");
col_clear(pinfo->cinfo, COL_INFO);
if (flags & TDMOP_FLAG_LOST_REQUEST)
{
col_set_str(pinfo->cinfo, COL_INFO, "Lost Request");
}
ti = proto_tree_add_item(tree, proto_tdmop, tvb, 0, -1, ENC_NA);
tdmop_tree = proto_item_add_subtree(ti, ett_tdmop);
/*path info*/
proto_tree_add_item(tdmop_tree, hf_tdmop_TransferID, tvb, offset, 4, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item_ret_uint(tdmop_tree, hf_tdmop_DstCh, tvb, offset, 1, ENC_LITTLE_ENDIAN, &dstch);
offset += 1;
proto_tree_add_item_ret_uint(tdmop_tree, hf_tdmop_SrcCh, tvb, offset, 1, ENC_LITTLE_ENDIAN, &srcch);
offset += 1;
/*conversation*/
conversation_set_conv_addr_port_endpoints(pinfo, &pinfo->src, &pinfo->dst, CONVERSATION_TDMOP, srcch, dstch);
/*flags*/
proto_tree_add_item(tdmop_tree, hf_tdmop_Flags, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tdmop_tree, hf_tdmop_Flags_no_data, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tdmop_tree, hf_tdmop_Flags_lost_request, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tdmop_tree, hf_tdmop_Flags_remote_no_data, tvb, offset, 1, ENC_NA);
proto_tree_add_item(tdmop_tree, hf_tdmop_Flags_compressed, tvb, offset, 1, ENC_NA);
offset += 1;
/*sequence and delay info*/
proto_tree_add_item(tdmop_tree, hf_tdmop_SrcDst, tvb, offset, 1, ENC_LITTLE_ENDIAN);
offset += 1;
proto_tree_add_item(tdmop_tree, hf_tdmop_SeqNum, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tdmop_tree, hf_tdmop_LastRecv, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tdmop_tree, hf_tdmop_Delay, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(tdmop_tree, hf_tdmop_Reserved, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
if ((flags & TDMOP_FLAG_NO_DATA)==0)
{
int len;
int blockid;
dchannel_len=0;
len=tvb_captured_length_remaining(tvb, 0);
proto_tree_add_item(tdmop_tree, hf_tdmop_payload, tvb, offset, -1, ENC_NA);
blockid=0;
/*demux TDM stream*/
while (offset<len)
{
proto_tree *currentblock = proto_tree_add_subtree_format(tdmop_tree, tvb, 0, 0, ett_tdmop_channel, 0, "Block %d", blockid);
uint32_t mask;
int i;
int j;
blockid++;
mask = pref_tdmop_mask; /*default mask is for timeslots 1-32*/
if (flags&TDMOP_FLAG_COMPRESSED)
{
mask = tvb_get_letohl(tvb,offset);
mask = ((mask >> 16) & 0xFFFF)|((mask & 0xFFFF) << 16);
proto_tree_add_uint(currentblock, hf_tdmop_Compression_mask, tvb, offset, 4, mask);
offset+=4;
}
for (i=0; i<32; i++)
{
if (mask & (1UL<<i))
{
proto_tree *subtree;
tvbuff_t *cdata;
subtree = proto_tree_add_subtree_format(currentblock, tvb, 0, 0, ett_tdmop_channel, 0, "Channel %d", i);
cdata = tvb_new_subset_length(tvb, offset, 4);
if (i==pref_tdmop_d_channel)
{
if (dchannel_len + 4 < MAX_DCHANNEL_LEN)
{
for (j = 0; j < 4; j++)
{
dchannel_data[dchannel_len+j]=reverse_map[tvb_get_uint8(cdata, j)];
}
dchannel_len += 4;
}
} else
{
call_data_dissector(cdata, pinfo, subtree);
}
offset += 4;
}
}
}
if (dchannel_len>0)
{
uint8_t *buff = (uint8_t *)wmem_memdup(pinfo->pool, dchannel_data, dchannel_len);
tvbuff_t *new_tvb;
new_tvb = tvb_new_child_real_data(tvb, buff, dchannel_len, dchannel_len);
call_dissector(lapd_handle, new_tvb, pinfo, tree);
}
}
return tvb_captured_length(tvb);
}
void proto_register_tdmop(void)
{
module_t *tdmop_module;
static hf_register_info hf[] =
{
{
&hf_tdmop_TransferID,
{ "TDMoP Transfer ID", "tdmop.transferid",
FT_UINT32, BASE_HEX,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_DstCh,
{ "TDMoP Dst Ch", "tdmop.dstch",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_SrcCh,
{ "TDMoP Src Ch", "tdmop.srcch",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_Flags,
{ "TDMoP Flags", "tdmop.flags",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_Flags_lost_request,
{ "TDMoP Lost Request Flag", "tdmop.flags.lostrequest",
FT_BOOLEAN, 8,
NULL, TDMOP_FLAG_LOST_REQUEST,
NULL, HFILL}
},
{
&hf_tdmop_Flags_no_data,
{ "TDMoP No data flag", "tdmop.flags.nodata",
FT_BOOLEAN, 8,
NULL, TDMOP_FLAG_NO_DATA,
NULL, HFILL}
},
{
&hf_tdmop_Flags_remote_no_data,
{ "TDMoP No data received from remote side flag", "tdmop.flags.remotenodata",
FT_BOOLEAN, 8,
NULL, TDMOP_FLAG_REMOTE_NO_DATA,
NULL, HFILL}
},
{
&hf_tdmop_Flags_compressed,
{ "TDMoP compressed framed", "tdmop.flags.compressed",
FT_BOOLEAN, 8,
NULL, TDMOP_FLAG_COMPRESSED,
NULL, HFILL}
},
{
&hf_tdmop_SrcDst,
{ "TDMoP Short SrcDst", "tdmop.srcdst",
FT_UINT8, BASE_HEX,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_SeqNum,
{ "TDMoP Sequence number", "tdmop.seqnum",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_LastRecv,
{ "TDMoP Last Received number", "tdmop.recvnumber",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_Delay,
{ "TDMoP Delay", "tdmop.delay",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_Reserved,
{ "TDMoP Reserved", "tdmop.reserved",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_payload,
{ "TDMoP Payload", "tdmop.payload",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL}
},
{
&hf_tdmop_Compression_mask,
{ "TDMoP Compression mask", "tdmop.cmask",
FT_UINT32, BASE_HEX,
NULL, 0x0,
NULL, HFILL}
}
};
static int *ett[] = {
&ett_tdmop,
&ett_tdmop_channel
};
proto_tdmop = proto_register_protocol ("TDMoP protocol", "TDMoP", "tdmop");
proto_register_field_array(proto_tdmop, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
tdmop_handle = register_dissector("tdmop", dissect_tdmop, proto_tdmop);
tdmop_module = prefs_register_protocol(proto_tdmop, proto_reg_handoff_tdmop);
prefs_register_uint_preference(tdmop_module, "d_channel",
"TDMoP D-Channel",
"The TDMoD channel that contains the D-Channel.",
10, &pref_tdmop_d_channel);
prefs_register_uint_preference(tdmop_module, "ts_mask",
"TDMoP default timeslot mask",
"The bitmask of channels in uncompressed TDMoP frame",
16, &pref_tdmop_mask);
prefs_register_uint_preference(tdmop_module, "ethertype",
"Ethertype for TDMoP stream(Usually 0808)",
"The ethertype assigned to TDMoP (without IP/UDP) stream",
16, &pref_tdmop_ethertype);
}
void proto_reg_handoff_tdmop(void)
{
static bool init = false;
static uint32_t current_tdmop_ethertype;
if (!init)
{
dissector_add_for_decode_as_with_preference("udp.port", tdmop_handle);
if (pref_tdmop_ethertype) {
dissector_add_uint("ethertype", pref_tdmop_ethertype, tdmop_handle);
}
lapd_handle = find_dissector_add_dependency("lapd-bitstream", proto_tdmop);
current_tdmop_ethertype = pref_tdmop_ethertype;
init = true;
}
if (current_tdmop_ethertype != pref_tdmop_ethertype)
{
dissector_delete_uint("ethertype", current_tdmop_ethertype, tdmop_handle);
if (pref_tdmop_ethertype) {
dissector_add_uint("ethertype", pref_tdmop_ethertype, tdmop_handle);
}
current_tdmop_ethertype = pref_tdmop_ethertype;
}
}
/*
* Editor modelines - https://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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