1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/* packet-tte.c
* Routines for Time Triggered Ethernet dissection
*
* Author: Valentin Ecker, valentin.ecker (AT) tttech.com
* Author: Benjamin Roch, benjamin.roch (AT) tttech.com
*
* TTTech Computertechnik AG, Austria.
* https://www.tttech.com/technologies/time-triggered-ethernet/
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/etypes.h>
#include "packet-tte.h"
void proto_register_tte(void);
void proto_reg_handoff_tte(void);
static dissector_handle_t ethertype_handle;
/* Initialize the protocol and registered fields */
static int proto_tte;
static int hf_eth_dst;
static int hf_tte_dst_cf;
static int hf_tte_ctid;
static int hf_eth_src;
static int hf_eth_type;
/* preference value pointers */
static uint32_t tte_pref_ct_marker = 0xFFFFFFFF;
static uint32_t tte_pref_ct_mask = 0x0;
/* Initialize the subtree pointers */
static int ett_tte;
static int ett_tte_macdest;
/* Code to actually dissect the packets */
static bool
dissect_tte(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
int is_frame_pcf;
ethertype_data_t ethertype_data;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *tte_root_item, *tte_macdest_item;
proto_tree *tte_tree, *tte_macdest_tree;
/* Check that there's enough data */
if (tvb_reported_length(tvb) < TTE_HEADER_LENGTH)
return false;
/* check if data of pcf frame */
is_frame_pcf =
(tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) == ETHERTYPE_TTE_PCF);
/* return if no valid constant field is found */
if (!is_frame_pcf)
{
if ( (tvb_get_ntohl(tvb, 0) & tte_pref_ct_mask) != tte_pref_ct_marker)
return false;
}
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TTE/");
if (tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) <= IEEE_802_3_MAX_LEN)
{
col_set_str(pinfo->cinfo, COL_INFO, "TTEthernet Frame");
}
else
{
col_set_str(pinfo->cinfo, COL_INFO, "Bogus TTEthernet Frame");
}
if (tree) {
/* create display subtree for the protocol */
tte_root_item = proto_tree_add_item(tree, proto_tte, tvb, 0,
TTE_HEADER_LENGTH, ENC_NA);
tte_tree = proto_item_add_subtree(tte_root_item, ett_tte);
tte_macdest_item = proto_tree_add_item(tte_tree,
hf_eth_dst, tvb, 0, TTE_MAC_LENGTH, ENC_NA);
proto_tree_add_item(tte_tree,
hf_eth_src, tvb, TTE_MAC_LENGTH, TTE_MAC_LENGTH, ENC_NA);
proto_tree_add_item(tte_tree,
hf_eth_type, tvb, TTE_MAC_LENGTH*2, TTE_ETHERTYPE_LENGTH,
ENC_BIG_ENDIAN);
tte_macdest_tree = proto_item_add_subtree(tte_macdest_item,
ett_tte_macdest);
proto_tree_add_item(tte_macdest_tree,
hf_tte_dst_cf, tvb, 0, TTE_MACDEST_CF_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(tte_macdest_tree,
hf_tte_ctid, tvb, TTE_MACDEST_CF_LENGTH,
TTE_MACDEST_CTID_LENGTH, ENC_BIG_ENDIAN);
}
/* prevent clearing the Columns...appending cannot be prevented */
col_set_fence(pinfo->cinfo, COL_PROTOCOL);
/* call std Ethernet dissector */
ethertype_data.etype = tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2);
ethertype_data.payload_offset = TTE_HEADER_LENGTH;
ethertype_data.fh_tree = NULL;
ethertype_data.trailer_id = 0;
ethertype_data.fcs_len = 0;
call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
return true;
}
void
proto_register_tte(void)
{
module_t *tte_module;
static hf_register_info hf[] = {
{ &hf_tte_dst_cf,
{ "Constant Field", "tte.cf",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_tte_ctid,
{ "Critical Traffic Identifier", "tte.ctid",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
}
};
/* Setup protocol subtree array */
static int *ett[] = {
&ett_tte,
&ett_tte_macdest
};
/* Register the protocol name and description */
proto_tte = proto_register_protocol("TTEthernet", "TTE", "tte");
/* Required function calls to register header fields and subtrees used */
proto_register_field_array(proto_tte, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register preferences module */
tte_module = prefs_register_protocol(proto_tte, NULL);
/* Register preferences */
prefs_register_uint_preference(tte_module, "ct_mask_value",
"CT Mask (in hex)",
"Critical Traffic Mask (base hex)",
16, &tte_pref_ct_mask);
prefs_register_uint_preference(tte_module, "ct_marker_value",
"CT Marker (in hex)",
"Critical Traffic Marker (base hex)",
16, &tte_pref_ct_marker);
}
void
proto_reg_handoff_tte(void)
{
heur_dissector_add("eth", dissect_tte, "TTEthernet", "tte_eth", proto_tte, HEURISTIC_ENABLE);
hf_eth_dst = proto_registrar_get_id_byname ("eth.dst");
hf_eth_src = proto_registrar_get_id_byname ("eth.src");
hf_eth_type = proto_registrar_get_id_byname ("eth.type");
ethertype_handle = find_dissector_add_dependency("ethertype", proto_tte);
}
/*
* 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:
*/
|
