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/* packet-dpnss-link.c
* Routines for DPNSS/DASS2 link layer dissection
* Copyright 2009, Rolf Fiedler <rolf.fiedler[at]innoventif[dot]de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* References:
* BTNR188
* ND1301:2001/03 http://www.nicc.org.uk/nicc-public/Public/interconnectstandards/dpnss/nd1301_2004_11.pdf
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_dpnss_link(void);
void proto_reg_handoff_dpnss_link(void);
static dissector_handle_t dpnss_handle; /* DPNSS UI frame dissector */
#define LINK_HEADER_SIZE 3
static int proto_dpnss_link = -1;
static int hf_dpnss_link_address_framegroup = -1;
static int hf_dpnss_link_address_crbit = -1;
static int hf_dpnss_link_address_extension = -1;
static int hf_dpnss_link_address2_reserved = -1;
static int hf_dpnss_link_address2_dlcId = -1;
static int hf_dpnss_link_address2_dlcIdNr = -1;
static int hf_dpnss_link_address2_extension = -1;
static int hf_dpnss_link_control_frameType = -1;
static const value_string dpnss_link_framegroup_vals[] = {
{ 0x11, "Information Frame" },
{ 0x03, "Control Frame" },
{ 0, NULL }
};
static const value_string dpnss_link_crbit_vals[] = {
{ 0x0, "Command/Response Bit Cleared" },
{ 0x1, "Command/Response Bit Set" },
{ 0, NULL }
};
static const value_string dpnss_link_extend_vals[] = {
{ 0x0, "Extended to next octet" },
{ 0x1, "Final octet" },
{ 0, NULL }
};
static const value_string dpnss_link_reserved_vals[] = {
{ 0x0, "Reserved" },
{ 0x1, "Reserved" },
{ 0, NULL }
};
static const value_string dpnss_link_dlcId_vals[] = {
{ 0x0, "Real Channel" },
{ 0x1, "Virtual Channel" },
{ 0, NULL }
};
#define FRAME_TYPE_UI_EVEN 0x03
#define FRAME_TYPE_UI_ODD 0x13
#define FRAME_TYPE_SABMR 0xef
#define FRAME_TYPE_UA 0x63
static const value_string dpnss_link_frameType_vals[] = {
{ FRAME_TYPE_UI_EVEN, "UI (even)" },
{ FRAME_TYPE_UI_ODD, "UI (odd)" },
{ FRAME_TYPE_SABMR, "SABMR" },
{ FRAME_TYPE_UA, "UA" },
{ 0, NULL }
};
static int ett_dpnss_link = -1;
static dissector_handle_t dpnss_link_handle;
/* Code to actually dissect the packets */
static int
dissect_dpnss_link(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *item;
proto_tree *dpnss_link_tree;
guint8 octet;
tvbuff_t *protocol_data_tvb;
guint16 protocol_data_length;
gboolean uton;
uton = pinfo->pseudo_header->l1event.uton;
/* Make entries in src and dst column */
col_set_str(pinfo->cinfo, COL_DEF_SRC, uton?"TE":"NT");
col_set_str(pinfo->cinfo, COL_DEF_DST, uton?"NT":"TE");
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DPNSS");
item = proto_tree_add_item(tree, proto_dpnss_link, tvb, 0, -1, ENC_NA);
dpnss_link_tree = proto_item_add_subtree(item, ett_dpnss_link);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_framegroup,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_crbit,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address_extension,
tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_reserved,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_dlcId,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_dlcIdNr,
tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_address2_extension,
tvb, 1, 1, ENC_BIG_ENDIAN);
/*
* XXX - DPNSS's layer 2 protocol appears to be Yet Another
* HDLC Derivative; should this use the xDLC control field
* dissector code?
*/
proto_tree_add_item(dpnss_link_tree, hf_dpnss_link_control_frameType,
tvb, 2, 1, ENC_BIG_ENDIAN);
octet = tvb_get_guint8(tvb, 2);
switch (octet){
case FRAME_TYPE_UI_EVEN:
case FRAME_TYPE_UI_ODD:
protocol_data_length=tvb_reported_length(tvb)-LINK_HEADER_SIZE;
protocol_data_tvb=tvb_new_subset_length(tvb, LINK_HEADER_SIZE,
protocol_data_length);
if (dpnss_handle && protocol_data_length>0) {
call_dissector(dpnss_handle, protocol_data_tvb, pinfo, tree);
}
break;
default:
break;
}
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_dpnss_link(void)
{
static hf_register_info hf[] = {
{ &hf_dpnss_link_address_framegroup,
{ "Frame Group", "dpnss_link.framegroup",
FT_UINT8, BASE_DEC, VALS(dpnss_link_framegroup_vals), 0xfc,
NULL, HFILL }
},
{ &hf_dpnss_link_address_crbit,
{ "C/R Bit", "dpnss_link.crbit",
FT_UINT8, BASE_DEC, VALS(dpnss_link_crbit_vals), 0x02,
NULL, HFILL }
},
{ &hf_dpnss_link_address_extension,
{ "Extension", "dpnss_link.extension",
FT_UINT8, BASE_DEC, VALS(dpnss_link_extend_vals), 0x01,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_reserved,
{ "Reserved", "dpnss_link.reserved",
FT_UINT8, BASE_DEC, VALS(dpnss_link_reserved_vals), 0x80,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_dlcId,
{ "DLC ID", "dpnss_link.dlcId",
FT_UINT8, BASE_DEC, VALS(dpnss_link_dlcId_vals), 0x40,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_dlcIdNr,
{ "DLC ID Number", "dpnss_link.dlcIdNr",
FT_UINT8, BASE_DEC, NULL, 0x3e,
NULL, HFILL }
},
{ &hf_dpnss_link_address2_extension,
{ "Extension", "dpnss_link.extension2",
FT_UINT8, BASE_DEC, VALS(dpnss_link_extend_vals), 0x01,
NULL, HFILL }
},
{ &hf_dpnss_link_control_frameType,
{ "Frame Type", "dpnss_link.frameType",
FT_UINT8, BASE_DEC, VALS(dpnss_link_frameType_vals), 0x0,
NULL, HFILL }
}
};
static gint *ett[] = { &ett_dpnss_link };
/* Register the protocol name and description */
proto_dpnss_link = proto_register_protocol("Digital Private Signalling System No 1 Link Layer",
"DPNSS Link", "dpnss_link");
dpnss_link_handle = register_dissector("dpnss_link", dissect_dpnss_link, proto_dpnss_link);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_dpnss_link, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_dpnss_link(void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_DPNSS, dpnss_link_handle);
dpnss_handle = find_dissector_add_dependency("dpnss", proto_dpnss_link);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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