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
|
/* packet-cisco-metadata.c
* Routines for dissection of Cisco's MetaData protocol.
* draft-smith-kandula-sxp
* Copyright 2013 by Vaibhav Katkade (vkatkade[AT]cisco.com)
*
* 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/etypes.h>
#if 0
#include "packet-ieee8023.h"
#endif
void proto_register_cmd(void);
void proto_reg_handoff_cmd(void);
static dissector_handle_t ethertype_handle;
static dissector_table_t gre_dissector_table;
static int proto_cmd = -1;
static int hf_cmd_version = -1;
static int hf_cmd_length = -1;
static int hf_cmd_options = -1;
static int hf_cmd_sgt = -1;
static int hf_eth_type = -1;
static int hf_cmd_trailer = -1;
static gint ett_cmd = -1;
static int
dissect_cmd_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint16 encap_proto;
ethertype_data_t ethertype_data;
proto_tree *cmd_tree = NULL;
gint offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD");
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
proto_item *ti = proto_tree_add_item(tree, proto_cmd, tvb, 0, 6, ENC_NA);
cmd_tree = proto_item_add_subtree(ti, ett_cmd);
proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN);
/*offset += 2;*/
}
encap_proto = tvb_get_ntohs(tvb, 6);
/* This Logic to identify and decode IEEE 802.3 frames is not working correctly. Carry over code from packet-vlan.c
* Commenting it out for now will display as Unknown for L2 control frames instead of showing a wrong decode.
*/
#if 0
if (encap_proto <= IEEE_802_3_MAX_LEN) {
gboolean is_802_2 = TRUE;
/* Don't throw an exception for this check (even a BoundsError) */
if (tvb_captured_length_remaining(tvb, 4) >= 2) {
if (tvb_get_ntohs(tvb, 4) == 0xffff)
is_802_2 = FALSE;
}
dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, cmd_tree, hf_eth_type, hf_cmd_trailer, 0);
} else {
#endif
ethertype_data.etype = encap_proto;
ethertype_data.offset_after_ethertype = 8;
ethertype_data.fh_tree = cmd_tree;
ethertype_data.etype_id = hf_eth_type;
ethertype_data.trailer_id = hf_cmd_trailer;
ethertype_data.fcs_len = 0;
call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
return tvb_captured_length(tvb);
}
static int
dissect_cmd_gre(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti = NULL;
proto_tree *cmd_tree = NULL;
guint16 encap_proto;
tvbuff_t *next_tvb;
gint offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD");
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
ti = proto_tree_add_item(tree, proto_cmd, tvb, 0, 6, ENC_NA);
cmd_tree = proto_item_add_subtree(ti, ett_cmd);
}
encap_proto = tvb_get_ntohs(tvb, 0);
proto_tree_add_item(cmd_tree, hf_eth_type, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
next_tvb = tvb_new_subset_remaining(tvb, offset);
if (!dissector_try_uint(gre_dissector_table, encap_proto, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_cmd(void)
{
static hf_register_info hf[] = {
{ &hf_cmd_version,
{ "Version", "cmd.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{ &hf_cmd_length,
{ "Length", "cmd.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{ &hf_cmd_options,
{ "Options", "cmd.options", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
},
{ &hf_cmd_sgt,
{ "SGT", "cmd.sgt", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{ &hf_eth_type,
{ "Type", "cmd.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }
},
{ &hf_cmd_trailer,
{ "Trailer", "cmd.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
},
};
static gint *ett[] = {
&ett_cmd
};
proto_cmd = proto_register_protocol("Cisco MetaData", "Cisco MetaData", "cmd");
proto_register_field_array(proto_cmd, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_cmd(void)
{
dissector_handle_t cmd_eth_handle;
dissector_handle_t cmd_gre_handle;
ethertype_handle = find_dissector_add_dependency("ethertype", proto_cmd);
gre_dissector_table = find_dissector_table("gre.proto");
cmd_eth_handle = create_dissector_handle(dissect_cmd_eth, proto_cmd);
cmd_gre_handle = create_dissector_handle(dissect_cmd_gre, proto_cmd);
dissector_add_uint("ethertype", ETHERTYPE_CMD, cmd_eth_handle);
dissector_add_uint("gre.proto", ETHERTYPE_CMD, cmd_gre_handle);
}
/*
* 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:
*/
|
