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