forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
179 lines
4.6 KiB
C
179 lines
4.6 KiB
C
/* packet-loop.c
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* Routines for Ethernet loopback/Configuration Test Protocol dissection,
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* as documented in section 8 "Ethernet Configuration Testing Protocol" of
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* the v2.0 DIX Ethernet specification.
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*
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* See
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*
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* http://decnet.ipv7.net/docs/dundas/aa-k759b-tk.pdf
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*
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* for a copy of the DIX spec and
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*
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* http://stuff.mit.edu/people/jhawk/ctp.html
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*
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* for section 8.
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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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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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void proto_register_loop(void);
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void proto_reg_handoff_loop(void);
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static int proto_loop = -1;
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static int hf_loop_skipcount = -1;
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static int hf_loop_function = -1;
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static int hf_loop_relevant_function = -1;
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static int hf_loop_receipt_number = -1;
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static int hf_loop_forwarding_address = -1;
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static gint ett_loop = -1;
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#define FUNC_REPLY 1
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#define FUNC_FORWARD_DATA 2
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static const value_string function_vals[] = {
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{ FUNC_REPLY, "Reply" },
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{ FUNC_FORWARD_DATA, "Forward Data" },
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{ 0, NULL }
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};
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static int
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dissect_loop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *loop_tree = NULL;
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proto_item *ti;
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guint16 function;
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int offset = 0;
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int skip_offset;
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gboolean set_info = TRUE;
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gboolean more_function;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LOOP");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_loop, tvb, offset, -1, ENC_NA);
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loop_tree = proto_item_add_subtree(ti, ett_loop);
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proto_tree_add_item(loop_tree, hf_loop_skipcount, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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}
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skip_offset = 2 + tvb_get_letohs(tvb, offset);
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offset += 2;
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do {
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function = tvb_get_letohs(tvb, offset);
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if (offset == skip_offset) {
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(function, function_vals, "Unknown function (%u)"));
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proto_tree_add_uint(loop_tree, hf_loop_relevant_function, tvb, offset, 2, function);
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set_info = FALSE;
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}
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proto_tree_add_uint(loop_tree, hf_loop_function, tvb, offset, 2, function);
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offset += 2;
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switch (function) {
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case FUNC_REPLY:
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proto_tree_add_item(loop_tree, hf_loop_receipt_number, tvb, offset, 2,
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ENC_LITTLE_ENDIAN);
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offset += 2;
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more_function = FALSE;
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break;
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case FUNC_FORWARD_DATA:
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proto_tree_add_item(loop_tree, hf_loop_forwarding_address, tvb, offset,
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6, ENC_NA);
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offset += 6;
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more_function = TRUE;
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break;
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default:
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more_function = FALSE;
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break;
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}
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} while (more_function);
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if (set_info) {
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col_set_str(pinfo->cinfo, COL_INFO, "No valid function found");
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}
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if (tvb_reported_length_remaining(tvb, offset) > 0)
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{
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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call_data_dissector(next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_loop(void)
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{
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static hf_register_info hf[] = {
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{ &hf_loop_skipcount,
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{ "skipCount", "loop.skipcount",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_loop_function,
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{ "Function", "loop.function",
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FT_UINT16, BASE_DEC, VALS(function_vals), 0x0,
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NULL, HFILL }},
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{ &hf_loop_relevant_function,
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{ "Relevant function", "loop.relevant_function",
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FT_UINT16, BASE_DEC, VALS(function_vals), 0x0,
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NULL, HFILL }},
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{ &hf_loop_receipt_number,
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{ "Receipt number", "loop.receipt_number",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_loop_forwarding_address,
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{ "Forwarding address", "loop.forwarding_address",
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FT_ETHER, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_loop,
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};
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proto_loop = proto_register_protocol("Configuration Test Protocol (loopback)",
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"LOOP", "loop");
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proto_register_field_array(proto_loop, 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_loop(void)
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{
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dissector_handle_t loop_handle;
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loop_handle = create_dissector_handle(dissect_loop, proto_loop);
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dissector_add_uint("ethertype", ETHERTYPE_LOOP, loop_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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